Produção Técnico-Científica em co-autoria dos Drs. L. C. M. Miranda e H. Vargas

Produção Técnico-Científica em co-autoria dos Drs. L. C. M. Miranda e H. Vargas

Compilação por décadas gerada automaticamente pelo URLibService (software Brasileiro)
a partir dos dados contidos no acervo digital
da Memória Técnico-Científica do INPE
Última atualização: 06/05/04

Periodo: 1971-1980

1977 (1)

Scalabrin, A.; Porto, S. P. S.; Vargas, H.; Lima, C. A. S.; Miranda, L. C. M.	art. 1
Temperature dependence of the broad A1 (TO) phonon Raman linewidth in BaTiO3

1978 (3)

Ghizoni, C. C.; Siqueira, M. A. A.; Vargas, H.; Miranda, L. C. M.	art. 2
On the use of photoacoustic cell for investigating the electron-phonon interaction in semiconductors

Gualberto, G. M.; Tenan, M. A.; Vargas, H.; Miranda, L. C. M.; Pelzl, J.	art. 3
Resonant Raman effect of O-3 in gamma -irradiated Ba(CLO3)2H2O and AgCLO3

Lima, C. A. S.; Miranda, L. C. M.; Vargas, H.; Porto, S. P. S.	art. 4
Temperature behavior of dielectric-constant of tetragonal BaTiO3

1979 (1)

Cesar, C. L.; Vargas, H.; Meyer, J. A.; Miranda, L. C. M.	art. 5
Photoacoustic effect in solids

1980 (3)

Galembeck, F.; Ghizoni, C. C.; Ribeiro, C. A.; Vargas, H.; Miranda, L. C. M.	art. 6
Characterization of a new composite-material - Fe2O3-impregnated poly(tetrafluoroethylene) - particle-size determination and photoacoustic-spectroscopy

Galembeck, F.; Leite, N. F.; Miranda, L. C. M.; Rechenberg, H. R.; Vargas, H.	art. 7
An EPR and mossbauer study of ultrafine iron (III) oxide particles in polytetrafluorethylene (PTEE) matrix

Siqueira, M. A. A.; Ghizoni, C. C.; Vargas, J. I.; Menezes, E. A.; Vargas, H.; Miranda, L. C. M.	art. 8
On the use of the photoacoustic effect for investigating phase-transitions in solids

Periodo: 1981-1990

1983 (1)

Cesar, C. L.; Vargas, H.; Mendes Filho, J.; Miranda, L. C. M.	art. 9
Photoacoustic determination of thermal diffusivity of solids: Application to CdS

1984 (3)

Cesar, C. L.; Vargas, H.; Lima, C. A. S.; Mendes Filho, J.; Miranda, L. C. M.	art. 10
On the use of photoacoustic-spectroscopy for investigating adulterated or altered powdered coffee sample

Cesar, C. L.; Vargas, H.; Pelzl, J.; Miranda, L. C. M.	art. 11
Phase-resolved photoacoustic microscopy: Application to ferromagnetic layered samples

Netzelmann, U.; Pelzl, J.; Vargas, H.; Cesar, C. L.; Miranda, L. C. M.	art. 12
Photoacoustic detection of FMR depth profiles

1985 (2)

Cesar, C. L.; Vargas, H.; Mendes Filho, J.; Miranda, L. C. M.	art. 13
Comment on photoacoustic determination of thermal diffusivity of solids: aplication to CdS : response

Cesar, C. L.; Vargas, H.; Miranda, L. C. M.	art. 14
Photoacoustic microscopy of layered samples: phase-detection technique

1986 (2)

Faria Jr., I. F.; Ghizoni, C. C.; Miranda, L. C. M.; Vargas, H.	art. 15
Photopyroelectric versus photoacoustic characterization of photovoltaic cells

Pessoa Jr., O.; Cesar, C. L.; Patel, N. A.; Vargas, H.; Ghizoni, C. C.; Miranda, L. C. M.	art. 16
Two-beam photoacoustic phase measurement of the thermal diffusivity of solids

1987 (7)

Bento, A. C.; Vargas, H.; Aguiar, M. M. F.; Miranda, L. C. M.	art. 17
Photoacoustic characterization of quartz-thermal-diffusivity

Faria Jr., I. F.; Miranda, L. C. M.; Vargas, H.; Fernandes, E.	art. 18
Optical inspection and monitoring of crazing in enamelled wires using light scattering

Ferreira, N.; Cella, N.; Vargas, H.; Miranda, L. C. M.	art. 19
Photoacoustic measurement of thermal diffusivity of polymer foils

Lima, G. A. R.; Baesso, M. L.; Arguello, Z. P.; Silva, E. C.; Vargas, H.; Miranda, L. C. M.	art. 20
Phase-resolved photoacoustic spectroscopy: application to metallic-ion-doped glasses

Mello, S. M. N.; Ghizoni, C. C.; Miranda, L. C. M.; Vargas, H.	art. 21
Photoacoustic characterization of photovoltaic cells

Nery, J. W.; Vargas, H.; Pessoa, H.; Reis, F. D. M.; Gabrielli, A. C.; Miranda, L. C. M.; Vinha, C. A.	art. 22
Photoacoustic-spectroscopy for depth-profile analysis and herbicice monitoring in leaves

Riette, H. L.; Miranda, L. C. M.; Vargas, H.	art. 23
Characterization of photovoltaic cells using the photothermal deflection spectroscopy

1988 (1)

Vargas, H.; Miranda, L. C. M.	art. 24
Photoacoustic and related photothermal techniques

1989 (9)

Baesso, M. L.; Mansanares, A. M.; Silva, E. C.; Vargas, H.; Miranda, L. C. M.	art. 25
Phase-resolved photoacoustic spectroscopy and EPR investigation of MnO2- and CoO-doped soda-lime glasses

Bento, A. C.; Aguiar, M. M. F.; Vargas, H.; Silva, M. D.; Bandeira, I. N.; Miranda, L. C. M.	art. 26
Open photoacoustic cell X-ray-detection

Bento, A. C.; Mansanares, A. M.; Vargas, H.; Miranda, L. C. M.	art. 27
Photoacoustic measurement of the thermal-diffusivity of anisotropic samples using the phase lag method

Cella, N.; Vargas, H.; Galembeck, E.; Galembeck, F.; Miranda, L. C. M.	art. 28
Photoacoustic monitoring of crosslinking reactions in low-density polyethlene

Ferreira, S. O.; Chen, Y. A.; Bandeira, I. N.; Miranda, L. C. M.; Vargas, H.	art. 29
Photoacoustic measurement of the thermal diffusivity of Pb1-xSnxTe alloys

Iacovacci, M.; Silva, E. C.; Vargas, H.; Galembeck, F.; Pinheiro, E. A.; Miranda, L. C. M.	art. 30
Photoacoustic monitoring of magnetite-crystal formation from iron(III) hydroxide acetate: Comparison with ESR results

Mansanares, A. M.; Baesso, M. L.; Silva, E. C.; Gandra, F. C. G.; Vargas, H.; Miranda, L. C. M.	art. 31
Photoacoustic and ESR studies of iron-doped soda-lime glasses: Thermal diffusivity

Pinto Neto, A.; Vargas, H.; Miranda, L. C. M.; Leite, N. F.	art. 32
Photoacoustic investigation of semiconductors: Influence of carrier diffusion and recombination in PbTe and Si

Torres Filho, A.; Leite, N. F.; Miranda, L. C. M.; Cella, N.; Vargas, H.	art. 33
Photoacoustic investigation of iodine-doped polystyrene

1990 (2)

Franzan, A. H.; Ferreira, N.; Vargas, H.; Miranda, L. C. M.	art. 34
Investigation of poling effects on PVDF pyroelectric detectors-photoacoustic thermal-diffusivity measurements

Mansanares, A. M.; Bento, A. C.; Vargas, H.; Leite, N. F.; Miranda, L. C. M.	art. 35
Photoacoustic measurement of the thermal properties of two-layer systems

Periodo: 1991-2000

1991 (2)

Marquezini, M. V.; Cella, N.; Mansanares, A. M.; Vargas, H.; Miranda, L. C. M.	art. 36
Open photoacoustic cell spectroscopy

Pinto Neto, A.; Vargas, H.; Miranda, L. C. M.	art. 37
Amorphization of ion-implanted layers in silicon using photoacoustic detection

1992 (1)

Pereira, A. C.; Zerbetto, M.; Silva, G. C.; Vargas, H.; Silva, W. J.; Neto, G. O.; Cella, N.; Miranda, L. C. M.	art. 38
OPC technique for in vivo studies in plant photosynthesis research

1993 (1)

Silva, W. J.; Vidal, B. C.; Martins, M. E. Q.; Vargas, H.; Pereira, A. C.; Zerbetto, M.; Miranda, L. C. M.	art. 39
What makes popcorn pop

1994 (1)

Pereira, A. C.; Neto, G. O.; Vargas, H.; Cella, N.; Miranda, L. C. M.	art. 40
On the use of the open photoacoustic cell technique for studying photosynthetic O2 evolution of undetached leaves: Comparison with Clark-type O2 electrode

1995 (2)

Silva, W. J.; Prioli, L. M.; Magalhães, A. C. N.; Pereira, A.; Vargas, H.; Mansanares, A. M.; Cella, N.; Miranda, L. C. M.; Alvarado-Gil, J.	art. 41
Photosynthetic O2 evolution in maize inbreds and their hybrids can be differentiated by open photoacoustic cell technique

Yanezlimon, M.; Rodriguez, M. E.; Alvara do Gil, J. J.; Zelayaangel, O.; Sanchezsinencio, F.; Cruz Orea, A.; Vargas, H.; Figueroa, J. D. C.; Martinezbustos, F.; Martinez, J. L.; Gonzalez Hernandez, J.; Arguello, C.; Miranda, L. C. M.	art. 42
Photoacoustic measurements of thermal-diffusivity and correlation with viscosity of instant corn dry masa flour

1996 (4)

Acosta-Avalos, D.; Alvarado-Gil, J. J.; Vargas, H.; Frías-Hernández, J.; Olalde-Portugal, V.; Miranda, L. C. M.	art. 43
Photoacoustic monitoring of the influence of arbuscular mycorrhizal infection on the photosynthesis of corn (Zea mays L.),

Balderas-López, J. A.; Gutiérrez-Juárez, G.; Alvarado-Gil, J. J.; Frías-Hernández, J.; Olalde-Portugal, V.; Miranda, L. C. M.; Silva, M. D.; Delgadillo, I.; Vargas, H.	art. 44
A new CO2 analyzer for measuring respiration rates in organic material

Cruz-Orea, A.; Delgadillo, I.; Vargas, H.; Pichardo, J. L.; Alvarado-Gil, J. J.; Miranda, L. C. M.	art. 45
On the use of the photoacoustic technique for the measurement of the thermomechanical properties of semiconductor two-layer systems

Rodriguez, M. E.; YanezLimon, M.; Alvarado Gil, J. J.; Vargas, H.; Sanchez Sinencio, F.; Figueroa, J. D. C.; Martinez Bustos, F.; Martinez Montes, J. L.; GonzalezHernandez, J.; Silva, M. D.; Miranda, L. C. M.	art. 46
Influence of the structural changes during alkaline cooking on the thermal, rheological, and dielectric properties of corn tortillas

1997 (4)

Alvarado-Gil, J. J.; Vargas, H.; Sanchez Sinencio, F.; Gonzalez Hernandez, J.; Miranda, L. C. M.	art. 47
Effect of lime content on the processing conditions of cooked maize tortillas: Changes of thermal, structural, and rheological properties

Calderón, A.; Alvarado-Gil, J. J.; Gurevich, Y. G.; Cruz-Orea, A.; Delgadillo, I.; Vargas, H.; Miranda, L. C. M.	art. 48
Photothermal Characterization of Electrochemical Etching Processed n-Type Porous Silicon

Delgadillo, I.; Cruz-Orea, A.; Vargas, H.; Calderón, A.; Alvarado-Gil, J. J.; Miranda, L. C. M.	art. 49
Photoacoustic technique for monitoring the thermal properties of porous silicon

Veleva, L.; Tomás, S. A.; Marín, E.; Cruz-Orea, A.; Delgadillo, I.; Alvarado-Gil, J. J.; Quintana, P.; Pomés, R.; Sánchez, F.; Vargas, H.; Miranda, L. C. M.	art. 50
On the use of the photoacoustic technique for corrosion monitoring of of metals: Cu an Zn oxides formed in tropical envirnments

1998 (2)

Guarcia-Quiroz, A.; Tomas, S. A.; Vargas, H.; Cruz-Orea, A.; Alvarado-Gill, J. J.; Velava, L.; Miranda, L. C. M.	art. 51
Photoacoustic spectroscopy of corrosion products of copper formed in tropical environments

Tomás, S. A.; Sammiguel, R. E.; Cruz-Orea, A.; Gomes da Silve, M.; Sthel, M. S.; Vargas, H.; Miranda, L. C. M.	art. 52
Photoacoustic detection of water vapour permeability in ZrO2-TiO2 ceramic

1999 (1)

Frias-Hernandez, J. T.; Aguilar-Ledezma, A. L.; Olalde-Portugal, V.; Balderas-Lopez, J. A.; Gutierrez-Juarez, G.; Alvarado-Gil, J. J.; Castro, J. J.; Vargas, H.; Albores, A.; Dendooven, L.; Balderas-Lopez, J. A.; Miranda, L. C. M.; Frias-Hernandez, J. T.	art. 53
Soil characteristics in semiarid highlands of central Mexico as affected by mesquite trees (Prosopis laevigata)

2000 (2)

Lima, J. A. P.; Marín, E.; Correa, O.; Silva, M. G.; Cardoso, S. L.; Gatts, C.; Rezende, C. E.; Vargas, H.; Miranda, L. C. M.	art. 54
Measurement of the thermal properties of liquids using a thermal wave interferometer

Lima, J. A. P.; Marín, E.; Silva, M. G.; Sthel, M. S.; Cardoso, S. L.; Takeuti, D. F.; Gatts, C.; Vargas, H.; Rezende, C. E.; Miranda, L. C. M.	art. 55
On the use of the thermal wave resonator cavity sensor for monitoring hydrocarbon vapors

Periodo: 2001-2004

2001 (4)

Lima, J. A. P.; Cardoso, S. L.; Silva, M. G.; Sthel, M. S.; Gatts, C. E. N.; Vargas, H.; Miranda, L. C. M.	art. 56
Thermal diffusivity as an automotive fuel characterization parameter: correlation with motor octane number

Lima, J. A. P.; Marín, E.; Silva, M. G.; Sthel, M. S.; Schramm, D. U.; Cardoso, S. L.; Vargas, H.; Miranda, L. C. M.	art. 57
Characterization of the thermal properties of gases using a thermal wave interferometer

Lima, J. A. P.; Marín, E.; Massunaga, M. S. O.; Correa, O.; Cardoso, S. L.; Vargas, H.; Miranda, L. C. M.	art. 58
Measurement of the thermal properties of liquid mixtures using a thermal wave interferometer

Lima, J. A. P.; Marín, E.; Silva, M. G.; Sthel, M. S.; Cardoso, S. L.; Vargas, H.; Miranda, L. C. M.	art. 59
Application of the thermal wave resonator to the measurement of the thermal diffusivity of gas mixtures

2002 (1)

Lima, J. A. P.; Silva, M. G.; Massunaga, M. S. O.; Marín, E.; Vargas, H.; Miranda, L. C. M.	art. 60
Monitoring of hydrocarbon vapor diffusion in air using a thermal wave interferometer

2003 (3)

Lima, J. A. P.; Silva, M. G.; Masssunaga, M. S. O.; Cardoso, S. L.; Vargas, H.; Marín, E.; Miranda, L. C. M.	art. 61
Monitoring of gas diffusion in air using the TWI technique: Thermal diffusivity measurements made easy

Lima, J. A. P.; Silva, M. G.; Sthel, M. S.; Cardoso, S. L.; Vargas, H.; Marín, E.; Miranda, L. C. M.	art. 62
Measurement of mass diffusivity in air using thermal wave interference detection

Vargas, H.; Miranda, L. C. M.	art. 63
Photothermal techniques applied to thermophysical properties measurements (plenary)

2004 (1)

Lima, J. A. P.; Massunaga, M. S. O.; Vargas, H.; Miranda, L. C. M.	art. 64
Photothermal detection of adulterants in automotive fuels.

art. 1

Tipo da Referência	Journal Article
Autor(es)	Scalabrin, A. Porto, S. P. S. Vargas, H. Lima, C. A. S. Miranda, L. C. M.
Título	Temperature dependence of the broad A1 (TO) phonon Raman linewidth in BaTiO3
Revista	Solid State Communications
Mês	Oct.
Ano	1977
Volume	24
Número	4
Páginas	291-294
Palavras-Chave	Temperature, Ferroelectricity
Resumo	The temperature dependence of the A1 (TO) broad phonon linewidth is discussed. It is shown that it can adequately be accounted for by assuming a simple model where the Ti ions are sitting off the center of the unit cell and tunneling through a double well in the direction of the ferroelectric axis. Résumé: On discute la dépendence en température de la largeur de la raie du phonon A1 (TO). On montre que ce phenomène peut être bien expliqué par un modèle simple, où les ions de Ti sont localisés hors du centre de la cellule unitaire et franchissent par effect tunnel un puits double dans la direction de l'axe ferroélectrique.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 12, Times Cited: 16
Area	FISMAT
Afiliação	Instituto de Física "Gleb Wataghin"
Usuário Avançado	marciana
atualizar

art. 2

Tipo da Referência	Journal Article
Autor(es)	Ghizoni, C. C. Siqueira, M. A. A. Vargas, H. Miranda, L. C. M.
Título	On the use of photoacoustic cell for investigating the electron-phonon interaction in semiconductors
Revista	Applied Physics Letters
Ano	1978
Volume	32
Número	9
Páginas	554-556
Palavras-Chave	Photoacoustic cell, Semiconductors, Transport properties, Crrystals, Phonons
Resumo	By exploring the simple periodic heat-flow principle of the photoacoustic cell we demonstrate experimentally the usefulness of the acoustic cell for studying the transport properties of semiconductors.An interesting feature of this technique is that it allows us to separate the different sources of sound generation in a semiconductor. Specific application is made for the case of Si crystals submitted to rectangular voltage pulses.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited Reference: Times Cited: 27
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Pesquisas Espaciais Instituto de Física, Universidade Estadual de Campinas
Usuário Avançado	marciana
atualizar

art. 3

Tipo da Referência	Journal Article
Autor(es)	Gualberto, G. M. Tenan, M. A. Vargas, H. Miranda, L. C. M. Pelzl, J.
Título	Resonant Raman effect of O-3 in gamma -irradiated Ba(CLO3)2H2O and AgCLO3
Revista	Physical Review B
Mês	Jan.
Ano	1978
Volume	17
Número	2
Páginas	919-923
Palavras-Chave	Resonant virbational, Raman measurements
Resumo	Resonant virbational Raman measurements of O-3 in gamma -irradiated Ba(ClO3)2H2O and AgClO3 are reported. It is concluded that the O-3 ions occupy two nonequivalent sites in the lattice. A simple model describing the unusual relative Raman intensities is also presented.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 18, Times Cited: 4
Area	FISMAT
Afiliação	Instituto de Física, Universidade Estadual de Campinas Institut für Experimentalphysik VI, Ruhr-Universität
Usuário Avançado	marciana
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art. 4

Tipo da Referência	Journal Article
Autor(es)	Lima, C. A. S. Miranda, L. C. M. Vargas, H. Porto, S. P. S.
Título	Temperature behavior of dielectric-constant of tetragonal BaTiO3
Revista	Physica Status Solid B: Basic Research
Ano	1978
Volume	86
Número	1
Páginas	373-378
Palavras-Chave	Dielectric constant, Temperature, Phonons
Resumo	A model is developed which assumes the temperature dependence of the dielectric constant of BaTiO3, along the ferroelectric axis in the tetragonal phase to be essentially determined by a relaxation mechanism involving dipole reorientation controled by tunneling across a double well potential barrier. Model parameters are determined from fits to existing data and it is shown that the fitted curves adjust well to the data within experimental error. The results support the hypothesis that the ferro-to-paraelectric transition in BaTiO3 is not governed by phonon assisted processes but must be ascribed to an intrinsic type of disorder
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 17, Times Cited:9
Area	FISMAT
Afiliação	Universidade Estadual de Campina, Instituto de Física Watachin
Usuário Avançado	marciana
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art. 5

Tipo da Referência	Journal Article
Autor(es)	Cesar, C. L. Vargas, H. Meyer, J. A. Miranda, L. C. M.
Título	Photoacoustic effect in solids
Revista	Physical Review Letters
Mês	June
Ano	1979
Volume	42
Número	23
Páginas	1570-1573
Palavras-Chave	Photoacoustic
Resumo	A quantitative derivation is presented for the production of the acoustic signal in a photoacoustic cell, taking into account the finite surface thermal resistance of the solid.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI:Cited Reference: 6, Times Cited: 29
Area	FISMAT
Afiliação	Instituto de Física, Universidade Estadual de Campinas
Usuário Avançado	marciana
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art. 6

Tipo da Referência	Journal Article
Autor(es)	Galembeck, F. Ghizoni, C. C. Ribeiro, C. A. Vargas, H. Miranda, L. C. M.
Título	Characterization of a new composite-material - Fe2O3-impregnated poly(tetrafluoroethylene) - particle-size determination and photoacoustic-spectroscopy
Revista	Journal of Applied Polymer Science
Ano	1980
Volume	25
Número	7
Páginas	1427-1433
Palavras-Chave	Iron, Composite materials, Photoacoustic spectroscopy
Resumo	Iron carbonyl sorption in PTFE, followed by in situ oxidation, gives the composite material, iron oxide-PTFE. Oxide particle size determination was performed by electron microscopy. The particles were found to be nearly spherical and very small, having diameters in the 30-40 a range overage. Optical absorption spectra were obtained by photoacoustic spectroscopy, and their intensities show a complex dependence on iron oxide concentration in the samples.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 18, Times Cited:12
Area	FISMAT
Grupo(s)	LAS
Afiliação	Universidade de São Paulo, Instituto de Química Universidade Estadual de Campinas, Instituto de Física Instituto de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 7

Tipo da Referência	Journal Article
Autor(es)	Galembeck, F. Leite, N. F. Miranda, L. C. M. Rechenberg, H. R. Vargas, H.
Título	An EPR and mossbauer study of ultrafine iron (III) oxide particles in polytetrafluorethylene (PTEE) matrix
Revista	Physica Status Solidi A : Applied Research
Ano	1980
Volume	60
Número	1
Páginas	63-68
Palavras-Chave	Mössbauer spectroscopy, Polytetrafluorethylen, Iron
Resumo	A novel method for the preparation of ultrafine Fe203 particles in a polymeric (PTFE) matrix is described. Mossbauer spectra allow the particles to be identified as a-Fe2O3 showing superparamagnetic behavior at room temperature. Electron paramagnetic resonance is investigated between liquid nitrogen and room temperatures. The resonance linewidth is found to be independent of temperature, and approximately inversely proportional to the particles volume (as determined by electron microscopy). The results indicate a strong size dependence of the anisotropy constant K. On décrit une nouvelle méthode pour la préparation de grains ultrafins de Fe2O3 dans une matrice polymérique (PTFE). Les spectra Mossbauer permettent d'identifier les grains comme du a-Fe2O3; ils sont superparamagnétiques à la température ambiante. Nons avons étudié la résonance paramagnétique électronique entre les températures de Yazote liquide et Fambiante. La largeur des raises est indépendante de la température, et inversement proportionelle au volume des grains (mesuré par microscopic électronique). Nos résultats indiquent une forte dépendence volumétrique de la constante d'anisotropie K.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 20, Times Cited:14
Area	FISMAT
Afiliação	Universidade de São Paulo, Instituto de Química Universidade Estadual de Campinas, Instituto de Física Universidade de São Paulo, Instituto de Física
Usuário Avançado	marciana
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art. 8

Tipo da Referência	Journal Article
Autor(es)	Siqueira, M. A. A. Ghizoni, C. C. Vargas, J. I. Menezes, E. A. Vargas, H. Miranda, L. C. M.
Título	On the use of the photoacoustic effect for investigating phase-transitions in solids
Revista	Journal of Applied Physics
Mês	Mar.
Ano	1980
Volume	51
Número	3
Páginas	1403-1406
Palavras-Chave	Photoacoustic effect, Phase transitions
Resumo	By exploring the dependence of the photoacoustic signal on the thermal properties of the sample, we demonstrate experimentally the usefulness of the photoacoustic effect for investigating phase transitions in solids. Special application is made for the case of Al-doped VO2. We also describe the photoacoustic cell utilized and the complete characterization of the cell is done by using a piece of germanium in single-crystal form which has well known thermal properties.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited Reference: 13, Times Cited: 35
Area	FISMAT
Grupo(s)	ETE
Afiliação	Departamento de Engenharia Espacial, Instituto de Pesquisas Espaciais Departamento de Qúmica, Universidade Federal de Minas Gerais Instituto de Física, Universidade Estadual de Campinas
Usuário Avançado	marciana
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art. 9

Tipo da Referência	Journal Article
Autor(es)	Cesar, C. L. Vargas, H. Mendes Filho, J. Miranda, L. C. M.
Título	Photoacoustic determination of thermal diffusivity of solids: Application to CdS
Revista	Applied Physics Letters
Mês	Sept.
Ano	1983
Volume	43
Número	6
Páginas	555-557
Palavras-Chave	Thermal diffusivity
Resumo	A novel and simple approach, which uses a lateral heating source for the sample, is proposed as an alternative method for the photoacoustic determination of the thermal diffusivity of solids. The method is experimentally tested using a CdS sample.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited Reference: 9, Times Cited: 32
Area	FISMAT
Afiliação	Instituto de Estudos Avançados, Centro Técnico Aeroespacial
Usuário Avançado	marciana
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art. 10

Tipo da Referência	Journal Article
Autor(es)	Cesar, C. L. Vargas, H. Lima, C. A. S. Mendes Filho, J. Miranda, L. C. M.
Título	On the use of photoacoustic-spectroscopy for investigating adulterated or altered powdered coffee sample
Revista	Journal of Agricultural and Food Chemistry
Mês	May
Ano	1984
Volume	32
Número	6
Páginas	1355-1358
Palavras-Chave	photoacoustic spectroscop
Resumo	Modern photoacoustic techniques have been employed to assess the concentration of commonly encountered adulterants in powdered coffee samples. The feasibility of the method is demonstrated for samples containing a mixture of roast ground parchment, corn, and barley with pure coffee powder. Extension to multicomponent mixes is discussed.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited Reference:6, Times Cited: 12
Area	FISMAT
Afiliação	Universidade Estadual de Campinas, Instituto de Física Centro Técnico da Aeroespacial, Instituto de estudos Avançados
Usuário Avançado	marciana
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art. 11

Tipo da Referência	Journal Article
Autor(es)	Cesar, C. L. Vargas, H. Pelzl, J. Miranda, L. C. M.
Título	Phase-resolved photoacoustic microscopy: Application to ferromagnetic layered samples
Revista	Journal of Applied Physics
Mês	May
Ano	1984
Volume	55
Número	10
Páginas	3460-3464
Palavras-Chave	acoustic signal
Resumo	The possibility of using the phase shift of the acoustic signal of different constituents as a new tool for a depth profile analysis of layered samples is discussed. This new method is experimentally demonstrated by measuring the phase variations of the photoacoustic detected ferromagnetic resonance of a sample consisting of an iron film bonded to a nickel film.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited Reference: 20, times Cited: 16
Area	FISMAT
Afiliação	Instituto de Física, Universidade Estadual de Campinas Instituto de Estudos Avançados, Cntro Técnico Aeroespacial
Usuário Avançado	marciana
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art. 12

Tipo da Referência	Journal Article
Autor(es)	Netzelmann, U. Pelzl, J. Vargas, H. Cesar, C. L. Miranda, L. C. M.
Título	Photoacoustic detection of FMR depth profiles
Revista	IEEE Transactions on Magnetics
Ano	1984
Volume	20
Número	5
Páginas	1252-1254
Palavras-Chave	Ferromagnetic resonance, Photoacoustic detection
Resumo	Depth profiles of ferromagnetic layered samples were studied with photoacoustically detected ferromagnetic resonance. Results obtained from recorder tapes and from a prepared nickel-iron sandwich are reported. Two different procedures based on frequency and phase resolved measurements were used to deconvolute the layered structure of the ferromagnetic samples. The depth resolution which is a function of the thermal diffusivity of the material and of the modulation frequency was as low as lum in the case of the ferromagnetic tapes.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited reference: 12, Times Cited: 4
Area	FISMAT
Afiliação	Ruhr Univ. Bochum, Inst. Expltl. Phys. Ger. Univesidade Estadual de Campinas, Instituto de Física Centro Técnico da Aeronautica, Instituto de Estudos Avançados
Usuário Avançado	marciana
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art. 13

Tipo da Referência	Journal Article
Autor(es)	Cesar, C L Vargas, H Mendes Filho, J. Miranda, L. C. M.
Título	Comment on photoacoustic determination of thermal diffusivity of solids: aplication to CdS : response
Revista	Applied Physics Letters
Ano	1985
Volume	47
Número	4
Páginas	434-435
Palavras-Chave	Thermal diffusivity
Resumo	A recent article proposed a photoacoustic method for determining the thermal diffusivity of optically transparent solids, and gave experimental confirmation. However, the theoretical basis for the method was partially in error, was unnecessarily limited to a one- dimensional treatment of heat flow, and failed to incorporate the effect of finite beam size. As the method does appear to have the advantage of simplicity of experimental arrangement, a proper theoretical discussion is warranted.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:19 , Times Cited:14
Area	FISMAT
Afiliação	Universidade Estadual de Campinas Instituto de Física, Centro Tecnologico Aerospacial, Instituto de Estudos Avaçados
Usuário Avançado	marciana
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art. 14

Tipo da Referência	Journal Article
Autor(es)	Cesar, C. L. Vargas, H. Miranda, L. C. M.
Título	Photoacoustic microscopy of layered samples: phase-detection technique
Revista	Journal of Physics D: Applied Physics
Mês	Apr.
Ano	1985
Volume	18
Número	4
Páginas	599-608
Palavras-Chave	Photoacoustic signal
Resumo	The possibility of using the phase shift of the photoacoustic signal of different constituents as an alternative tool for depth profile analysis of layered samples is discussed. The method proposed is experimentally demonstrated by measuring the phase variations of the photoacoustic-detected magnetic resonance of a sample consisting of a computer tape bonded to an aluminium foil. The experimental data are found to be in very good agreement with the theoretical predictions based upon the simple one-dimensional thermal piston model.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:19 , Times Cited:14
Area	FISMAT
Afiliação	Universidade Estadual de Campinas, Instituto de Física Centro Tecnologico Aerospacial, Instituto de Estudos Avaçados
Usuário Avançado	marciana
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art. 15

Tipo da Referência	Journal Article
Autor(es)	Faria Jr., I. F. Ghizoni, C. C. Miranda, L. C. M. Vargas, H.
Título	Photopyroelectric versus photoacoustic characterization of photovoltaic cells
Revista	Journal of Applied Physics
Mês	May
Ano	1986
Volume	59
Número	9
Páginas	3294-3296
Palavras-Chave	Photothermal pyroelectric technique, Photovoltaic cells, Photoacoustic detection
Resumo	The photothermal pyroelectric technique is applied to the characterization of photovoltaic cells and a comparison with the photoacoustic detection is presented. The difference between the photoacoustic and the pyroelectric data is interpreted in terms of a simple model for a junction-type solar cell.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI:Cited Reference: 18, Times Cited: 14
Afiliação	Instituto de Estudos Avançados, Centro Técnico Aeroespacial Instituto de Física, Universidade Estadual de Campinas
Usuário Avançado	marciana
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art. 16

Tipo da Referência	Journal Article
Autor(es)	Pessoa Jr., O. Cesar, C. L. Patel, N. A. Vargas, H Ghizoni, C. C. Miranda, L. C. M.
Título	Two-beam photoacoustic phase measurement of the thermal diffusivity of solids
Revista	Journal of Applied Physics
Mês	Feb.
Ano	1986
Volume	59
Número	4
Páginas	1316-1318
Palavras-Chave	Thermal diffusivity
Resumo	A simple method is demonstrated for obtaining the thermal diffusivity of solids, by measuring the phase lag between a front and rear illumination, at a single chopping frequency. The method is tested using some semiconductor and glass samples.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited Reference: 12, Times Cited: 98
Area	FISMAT
Afiliação	Instituto de Física, Universidade Estadual de Campinas Instituto de Estudos Avançados, Centro Técnico Aeroespacial
Usuário Avançado	marciana
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art. 17

Tipo da Referência	Journal Article
Autor(es)	Bento, A. C. Vargas, H. Aguiar, M. M. F. Miranda, L. C. M.
Título	Photoacoustic characterization of quartz-thermal-diffusivity
Revista	Physics and Chemistry of Glasses
Mês	June
Ano	1987
Volume	28
Número	3
Páginas	127-129
Palavras-Chave	quartz, photoacoustic thermal
Resumo	The photoacoustic thermal characterization of some quartz and glass sample is discussed. The physical quantity used as a thermal monitoring parameter is the thermal diffusivity, which is measured using the photoacoustic phase data. At low modulation frequencies the thermal diffusivity is obtained from the phase lag between the front and rear illumination. At high modulation frequencies the thermal diffusivity is obtained from the frequency dependence of the front phase illumination data.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:9, Times Cited:29
Area	FISMAT
Grupo(s)	LAS
Afiliação	Universidade Estadual de Campinas, Instituto de Física Universidade Federal da Bahia, Instituto de Física Instituto de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais
Usuário Avançado	marciana
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art. 18

Tipo da Referência	Journal Article
Autor(es)	Faria Jr., I. F. Miranda, L. C. M. Vargas, H. Fernandes, E.
Título	Optical inspection and monitoring of crazing in enamelled wires using light scattering
Revista	Journal of Physics E: Scintific Instruments
Mês	July
Ano	1987
Volume	20
Número	7
Páginas	891-893
Palavras-Chave	He-Ne laser
Resumo	A new method using He-Ne laser is proposed for the inspection and monitoring of micro-defects in enamelled wires. The method is based on the measurement of the light scattered from the wire. Its advantages over conventional optical and scanning electron microscopy are also discussed.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 5, Times Cited:1
Area	FISMAT
Afiliação	Centro Tecnico Aeroespacial, Instituto de Estudos, Avancados
Usuário Avançado	marciana
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art. 19

Tipo da Referência	Journal Article
Autor(es)	Ferreira, Nélia Cella, N. Vargas, H. Miranda, Luis Carlos Moura
Título	Photoacoustic measurement of thermal diffusivity of polymer foils
Revista	Journal of Applied Physics
Mês	Apr.
Ano	1987
Volume	61
Número	8
Páginas	3025-3027
Palavras-Chave	thermal diffusivity, photoacoustic signal
Resumo	The photoacoustic measurement of polymer foils, typically 170–200 µm thick, is discussed. It is shown that the measurement based upon the phase lag between the front and rear illuminations is applicable only in a limited range of frequencies from 6 to 12 Hz. The dominant mechanism responsible for the photoacoustic signal, in almost the entire frequency range 10–100 Hz, is proven to be the thermoelastic bending of the foil samples. The thermal diffusivity is then obtained from the frequency dependence of the front-phase illumination data.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Endereço de E-Mail	Universidade Estadual de Campinas (UNICAMP), Instituto de Física, Ministério da Ciência e Tecnologia, Instituto de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais
Divulgação	<E>WEBSCICited Reference: 11, Times Cited: 41
Area	FISMAT
Grupo(s)	LAS
Afiliação	Universidade Estadual de Campinas,Instituto de Física Instituto de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais
Usuário Avançado	marciana
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art. 20

Tipo da Referência	Journal Article
Autor(es)	Lima, G. A. R. Baesso, M. L. Arguello, Z. P. Silva, E. C. da Vargas, H. Miranda, L. C. M.
Título	Phase-resolved photoacoustic spectroscopy: application to metallic-ion-doped glasses
Revista	Physical Review B
Mês	Dec.
Ano	1987
Volume	36
Número	18
Páginas	9812-9815
Palavras-Chave	Photoacoustic signal, Soda lime silica glass, Glasses
Resumo	The possibility of using the phase shift of the photoacoustic signal of different constituents of a composite sample for resolving the spectra of the constituents, at a fixed modulation frequency, is discussed. The proposed method is experimentally tested using samples of soda-lime–silica glass doped with binary oxide mixtures.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 12, Times Cited: 22
Area	FISMAT
Grupo(s)	LAS
Afiliação	Laboratório Associado de Sensores e Materiais, Instituto de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 21

Tipo da Referência	Journal Article
Autor(es)	Mello, S. M. N. Ghizoni, C. C. Miranda, L. C. M. Vargas, H.
Título	Photoacoustic characterization of photovoltaic cells
Revista	Journal of Applied Physics
Mês	June
Ano	1987
Volume	61
Número	11
Páginas	5176-5178
Palavras-Chave	photoacoustic
Resumo	The photoacoustic characterization of Si solar-cell samples having distinct internal resistances, both at low and high modulation frequencies, yielded results significantly different from each other. For large samples with very small internal resistances (~0.1 ), the additional contribution of the current iss ipation near short-circuit conditions yielded results similar to those obtained with photothermal radiometry or the pyroelectric detection. For small samples, the results for the conversion efficiency, both at low and high modulation frequencies, are similar to ones obtained from the conventional electrical measurements.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI:Cited Reference: 12, Times Cited: 5
Area	FISMAT
Afiliação	Instituto de Estudos Avançados, Centro Técnico Aeroespacial
Usuário Avançado	marciana
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art. 22

Tipo da Referência	Journal Article
Autor(es)	Nery, J. W. Vargas, H. Pessoa, H. Reis, F. D. M. Gabrielli, A. C. Miranda, L. C. M. Vinha, C. A.
Título	Photoacoustic-spectroscopy for depth-profile analysis and herbicice monitoring in leaves
Revista	Analyst
Mês	Nov.
Ano	1987
Volume	112
Número	11
Páginas	1487-1490
Palavras-Chave	Photoacoustic spectroscopy
Resumo	Depth profiles of double-layer biological samples obtained by photoacoustic spectroscopy were studied using the two-signal phase-resolved method. The application of the method was demonstrated by singling out the spectra of the cuticle and the pigment layers of a leaf, and the pericarps and the endosperm layers of a corn kernel. The use of the method for monitoring temporal changes occurring in a leaf under the action of a herbicide was also investigated.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:12 , Times Cited:25
Area	FISMAT
Grupo(s)	LAS
Afiliação	Universidade Estadual de Campinas, Instituto de Física Universidade Estadual de Campinas, Instituto Química Universidade Estadual de Campinas, Instituto Biologia Instituto Nacional Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais Departamento de Física, Universidade do Mato Grosso do Sul
Usuário Avançado	marciana
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art. 23

Tipo da Referência	Journal Article
Autor(es)	Riette, H. L. Miranda, L. C. M. Vargas, H.
Título	Characterization of photovoltaic cells using the photothermal deflection spectroscopy
Revista	Applied Physics A: Material Science & Processing
Mês	May
Ano	1987
Volume	44
Número	3
Páginas	219-222
Palavras-Chave	photothermal deflection spectroscopy
Resumo	The use of photothermal deflection spectroscopy for a noncontact characterization of photovoltaic cells is presented. It is shown that this technique is capable of providing not only the optimum load resistance and conversion efficiency, but also the value of the internal series resistance of the cell. A comparison with other photothermal detection techniques is also presented .
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited Reference: 15, Times Cited: 2
Area	FISMAT
Afiliação	Centro Técnico Aerospacial, Instituto de Estudos Avancados Instituto de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais Universidade Estadual de Campinas, Instituto de Física
Usuário Avançado	marciana
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art. 24

Tipo da Referência	Journal Article
Autor(es)	Vargas, H. Miranda, L. C. M.
Título	Photoacoustic and related photothermal techniques
Revista	Physics Reports: Review Section of Physics Letters
Mês	Apr.
Ano	1988
Volume	161
Número	2
Páginas	43-101
Palavras-Chave	Photoacoustic techniques, Thermal properties
Resumo	We review the theory and applications of the photoacoustic and related methods belonging to the general area of photothermal measurement techniques. This essay is intended for researchers especially unfamiliar with the basic ideas and potentialities of this rapidly developing field. The applications of photothermal techniques include spectroscopic applications, such as infrared and microwave spectroscopies, monitoring of non-radiative deexcitation processes, biological applications, and measurements of thermal properties.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 286, Times Cited: 168
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Física, Universidade Estadual de Campinas Laboratório Associado de Sensores e Materiais, Instituto de Pesquisas Espaciais (INPE)
Usuário Avançado	marciana
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art. 25

Tipo da Referência	Journal Article
Autor(es)	Baesso, M. L. Mansanares, A. M. Silva, E. C. da Vargas, H. Miranda, L. C. M.
Título	Phase-resolved photoacoustic spectroscopy and EPR investigation of MnO2- and CoO-doped soda-lime glasses
Revista	Physical Review B
Mês	July
Ano	1989
Volume	40
Número	3
Páginas	1880-1884
Palavras-Chave	Aluminate glasses, Soda lime glass
Resumo	A discussion on the use of the phase shifts of the photoacoustic signal of different constituents of a composite sample for resolving their individual spectra is presented. It is experimentally shown that as long as we are interested in a qualitative analysis the method is simple and fast. For a quantitative analysis in which the nonradiative relaxation time and the characteristic diffusion time within the optical-absorption depth are sought, the method presents some limitations. This is demonstrated using MnO2- and CoO-doped soda-lime–silica glass samples.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Endereço de E-Mail	Instituto de Física, Universidade Estadual de Campinas, Laboratório Associado de Sensores e Materiais, Instituto de Pesquisas Espaciais
Divulgação	E WEBSCI: Cited Reference: 9, Times Cited: 16
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Física, Universidade Estadual de Campinas, Laboratório Associado de Sensores e Materiais nstituto de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais
Usuário Avançado	marciana
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art. 26

Tipo da Referência	Journal Article
Autor(es)	Bento, A. C. Aguiar, M. M. F. Vargas, H. Silva, M. D. da Bandeira, I. N. Miranda, L. C. M.
Título	Open photoacoustic cell X-ray-detection
Revista	Applied Physics B: Photophysics and laser chemistry
Mês	Mar.
Ano	1989
Volume	48
Número	3
Páginas	269-272
Repositório	<sid.inpe.br/marciana/2003/05.08.10.36>
Resumo	A simple open-cell configuration photoacoustic x ray detector is experimentally demonstrated. The front air chamber of a commercial electret microphone is used as the transducer medium of conventional photoacoustics. The observed signal is well described by the thermal diffusion model for the photoacoustic signal.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited Reference: 20, Times Cited: 9
Area	FISMAT
Grupo(s)	LAS
Afiliação	Universidade Estadual de Campinas, Instituto de Física Instituto de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais
Usuário Avançado	marciana
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art. 27

Tipo da Referência	Journal Article
Autor(es)	Bento, A. C. Mansanares, A. M. Vargas, H. Miranda, L. C. M.
Título	Photoacoustic measurement of the thermal-diffusivity of anisotropic samples using the phase lag method
Revista	Physics and Chemistry of Glasses
Mês	Aug.
Ano	1989
Volume	30
Número	4
Páginas	160-162
Palavras-Chave	Thermal diffusivity, Crystals of quartz, Amethyst.
Resumo	The extension of the photoacoustic phase lag method for measuring the thermal diffusivity to the case of anisotropic sample is tested using single crystals of quartz and amethyst.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:10 , Times Cited:3
Area	FISMAT
Grupo(s)	LAS
Afiliação	Universidade Estadual de Campinas, Instituto de Física Instituto de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais
Usuário Avançado	marciana
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art. 28

Tipo da Referência	Journal Article
Autor(es)	Cella, N. Vargas, H. Galembeck, E. Galembeck, F. Miranda, L. C. M.
Título	Photoacoustic monitoring of crosslinking reactions in low-density polyethlene
Revista	Journal of Applied Polymer Science C: Polymer Letters
Mês	Aug.
Ano	1989
Volume	27
Número	9
Páginas	313-320
Palavras-Chave	Photoacoustic techniques, Photothermal techniques
Resumo	In the last 10 years we have witnessed the rapid development of photoacoustic and related photothermal techniques for nondestructive materials inspection in several areas of research. For a comprehensive review of photothermal wave phenomena and their applications, we refer to the books by Rosenewaig and Mandelis and to some of the many review articles published on the subject. The photoacoustic (PA) spectroscopy looks directly at the heat generated in a sample, owing to the nonradiative deexcitation processes following the absorption of modulated light. In a conventional PA experimental arrangement a sample is enclosed in an air-tight cell and exposed to a chopped light beam. As a result of the periodic heating of the sample, owing to the light-into-heat conversion, the pressure in the chamber oscillates at the chopping frequency and can be detected by a sensitive microphone coupled to the cell. The resulting PA signal depends not only on the amount of -heat generated in the sample, i.e., on the optical absorption coefficient for the incident radiation as well as the light-into-heat conversion efficiency, but also on how this heat diffuses through the sample. The dependence upon these factors is the main reason underlying the versatility of the PA technique. Since the PA signal depends on the absorption coefficient of the incident radiation, spectroscopic studies can be performed, whereas the fact that the signal is also proportional to the light-into-heat conversion efficiency means that it is complementary to other photoinduced energy conversion processes and can, therefore, be used to study nonthermal deexcitation processes. Finally, the fact that the PA signal depends on how the heat diffuses through the sample allows us to perform not only thermal characterization of the sample (i.e., measurement of its theremal properties) but also to conduct thermal imaging. This last point comes from the fact that the thermal wave generated by the absorption of the incident light pulse may be reflected and scattered as it encounters cracks, defects, and so on, thereby affecting the detected signal.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 24, Times Cited:9
Area	FISMAT
Grupo(s)	LAS
Afiliação	Universidade Estadual de Campinas, Instituto de Física Universidade Estadual de Campinas, Instituto de Química Instituto de Pesquisas Espaciais, Labopratório Associado de Sensores e Materiais
Usuário Avançado	marciana
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art. 29

Tipo da Referência	Journal Article
Autor(es)	Ferreira, S. O. Chen, Y. A. Bandeira, Irajá Newton Miranda, Luis Carlos Moura Vargas, H.
Título	Photoacoustic measurement of the thermal diffusivity of Pb1-xSnxTe alloys
Revista	Physical Review B
Mês	Apr.
Ano	1989
Volume	39
Número	11
Páginas	7967-7970
Palavras-Chave	thermal diffusivity, Photoacoustic measurement
Resumo	A simple open photoacoustic cell method is demonstrated for obtaining the thermal diffusivity of Pb1-xSnxTe alloys. It is based upon the measurement of the acoustic signal as a function of the modulation frequency in the region where the sample is thermally thick. The dependence of the measured values of the thermal diffusivity as a function of the alloy composition is also discussed.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 14 Times: 15
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Física, Universidade Estadual de Campinas Laboratório Associado de Sensores e Materiais, Instituto de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 30

Tipo da Referência	Journal Article
Autor(es)	Iacovacci, M. Silva, E. C. da Vargas, H. Galembeck, F. Pinheiro, E. A. Miranda, L. C. M.
Título	Photoacoustic monitoring of magnetite-crystal formation from iron(III) hydroxide acetate: Comparison with ESR results
Revista	Journal of Applied Physics53
Mês	June
Ano	1989
Volume	65
Número	12
Páginas	5150-5153
Palavras-Chave	Crystals, Temperature
Resumo	The formation of crystalline magnetite by 1-h heat treatment of iron(III) hydroxide acetate is described. This amorphous-crystalline solid transformation is monitored by electron-spin resonance and photoacoustic spectroscopies. No significant changes were detected for samples heated below 190 °C. Above this temperature both techniques presented results following a definite pattern, namely, the enhancement of ion mobility leading to particle growth and crystallization for a temperature up to 240 °C and the onset of magnetic ordering of magnetite near this temperature.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited Reference: 21, time Cited: 3
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Física, Universidade Estadual de Campinas Instituto de Química, Universidade Estadual de Campinas Instituto de Pesquisas Espaciais. Laboratório Associado de Sensores e Materiais
Projeto	LAS
Usuário Avançado	marciana
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art. 31

Tipo da Referência	Journal Article
Autor(es)	Mansanares, A. M. Baesso, M. L. Silva, E. C. da Gandra, F. C. G. Vargas, H. Miranda, L. C. M.
Título	Photoacoustic and ESR studies of iron-doped soda-lime glasses: Thermal diffusivity
Revista	Physical Review B
Mês	Oct.
Ano	1989
Volume	40
Número	11
Páginas	7912-7915
Palavras-Chave	Photoacoustic technique, Thermal diffusivity, Iron-doped, Soda lime glass, Glasses
Resumo	The photoacoustic technique is used to measure the thermal diffusivity of iron-doped soda-lime glasses. To explain the thermal diffusivity behavior as a function of the iron content in the samples, electron-spin-resonance data were used. It is concluded that the main reason for the observed changes in the thermal diffusivity is the ferric ion entering substitutionally at the Si4+ sites.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 20, Times Cited: 17
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Física, Universidade Estadual de Campinas Laboratório Associado de Sensores e Materiais, Instituto de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 32

Tipo da Referência	Journal Article
Autor(es)	Pinto Neto, A. Vargas, H. Miranda, L. C. M. Leite, Nélia Ferreira
Título	Photoacoustic investigation of semiconductors: Influence of carrier diffusion and recombination in PbTe and Si
Revista	Physical Review B
Mês	Aug.
Ano	1989
Volume	40
Número	6
Páginas	3924-3930
Palavras-Chave	Semiconductors, Photoacoustic signal
Resumo	The photoacoustic signal of a narrow-gap semiconductor and of Si is investigated as a function of the modulation frequency through the use of a heat-transmission configuration. It is shown that in the thermally thick modulation-frequency range the signal amplitude can single out the different heating sources responsible for the photoacoustic signal. It is also shown that from the signal phase data, as a function of the modulation frequency, we can obtain the values of the surface recombination velocity and the nonradiative band-to-band recombination time.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Endereço de E-Mail	Instituto de Fiiaasica, Universidade Estadual de Campinas, Laboratório Associado de Sensores e Materiais, Instituto de Pesquisas Espaciais
Divulgação	E WEBSCI: Cited Reference: 20, Times Cited: 25
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Fiiaasica, Universidade Estadual de Campinas Laboratório Associado de Sensores e Materiais, Instituto de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 33

Tipo da Referência	Journal Article
Autor(es)	Torres Filho, A. Leite, Nélia Ferreira Miranda, L. C. M. Cella, N. Vargas, H.
Título	Photoacoustic investigation of iodine-doped polystyrene
Revista	Journal of Applied Physics
Mês	July
Ano	1989
Volume	66
Número	1
Páginas	97-102
Palavras-Chave	Polystyrene films, Photoacoustic spectroscopy
Resumo	The kinetics of iodine doping of atactic polystyrene films is investigated using photoacoustic spectroscopy. The changes in the photoacoustically measured physical properties, such as nonradiative relaxation time and thermal diffusivity, are present as a function of the doping time. The results show strong evidence that an order-disorder transition is taking place as a function of the doping time. The suggested order-disorder transition is also evident in the dielectric constant measurements of the doped films.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited Reference: 24, Times Cited: 23
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais Instituto de Física, Universidade Estadual de Campinas
Projeto	LAS
Usuário Avançado	marciana
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art. 34

Tipo da Referência	Journal Article
Autor(es)	Franzan, A. H. Ferreira, Nélia Vargas, H. Miranda, Luis Carlos Moura
Título	Investigation of poling effects on PVDF pyroelectric detectors-photoacoustic thermal-diffusivity measurements
Revista	Applied Physics A: Material Science & Processing
Mês	Apr.
Ano	1990
Volume	50
Número	4
Páginas	431-438
Palavras-Chave	Thermal properties, Polyvinylidene fluoride
Resumo	The influence of poling fields on the electrical and thermal properties of polyvinylidene fluoride (PVDF) pyroelectric detectors is discussed. It is shown that both the dielectric constant and the thermal diffusivity exhibit a monotonically increasing behavior with the poling field. The detectors were fabricated by solution casting of the PVDF films followed by thermal poling. It is concluded that the predominant crystal phase present in our films is the y-form. Except for the dielectric breakdown field, all the electrical and thermal properties of these films were found to be in good agreement with the commercially available ones. The thermal diffusivity was measured using the so-called open photoacoustic cell method.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E>WEBSCI: Cited Reference: 35, Times Cited: 9
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais
Usuário Avançado	marciana
atualizar

art. 35

Tipo da Referência	Journal Article
Autor(es)	Mansanares, A. M. Bento, A. C. Vargas, H. Leite, Nélia Ferreira Miranda, L. C. M.
Título	Photoacoustic measurement of the thermal properties of two-layer systems
Revista	Physical Review B
Mês	Sep.
Ano	1990
Volume	42
Número	7
Páginas	4477-4486
Palavras-Chave	Thotoacoustic techniques, Thermal diffusivity
Resumo	Using two different photoacoustic techniques for a two-layer system of variable thickness, we show that the thermal diffusivity and the thermal conductivity are completely determined, based upon the effective-sample model widely used in heat-transfer problems. A procedure to establish a standard photothermal technique for measuring both the thermal diffusivity and the thermal conductivity is also discussed.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 27, Times Cited: 48
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Fisica, Universidade Estadual de Campinas Laboratorio Associado de Sensores e Materiais, Instituto de Pesquisas Espaciais
Usuário Avançado	marciana
atualizar

art. 36

Tipo da Referência	Journal Article
Autor(es)	Marquezini, M V Cella, N Mansanares, A M Vargas, H Miranda, L. C. M.
Título	Open photoacoustic cell spectroscopy
Revista	Measurement Science and Technology
Mês	Apr.
Ano	1991
Volume	2
Número	4
Páginas	396-401
Palavras-Chave	Photoacoustic spectroscopy
Resumo	The possibility of using a minimal-volume photoacoustic cell to perform spectroscopy of samples is discussed. It is shown that this alternative signal-to-noise-enhanced photoacoustic configuration allows one to obtain both absorption and transmission spectra with minimal experimental arrangement and cell machining requirements. The theoretical model is presented, the use of which is exemplified by a complete optical and thermal characterization of leaves.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:24 , Times Cited:59
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Fisica, Universidade Estadual de Campinas Laboratbrio Associado de Sensores e Materiais, lnstituto de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 37

Tipo da Referência	Journal Article
Autor(es)	Pinto Neto, A. Vargas, H. Miranda, L. C. M.
Título	Amorphization of ion-implanted layers in silicon using photoacoustic detection
Revista	Applied Physics Letters
Mês	Feb.
Ano	1991
Volume	58
Número	5
Páginas	496-498
Palavras-Chave	Thermal properties, Temperature
Resumo	The influence of ion implantation in the thermal properties of silicon wafers at room temperature is investigated using the photoacoustic technique. It is suggested that the observed decrease of the values of both thermal diffusivity and conductivity, as the implantation dose increases, is due to the amorphization of the implanted layer.
Site	<iris.sid.inpe.br:1914>
Detentor da Cópia	SID/SCD
Divulgação	<E> WEBSCI: Cieted Reference:11, Times Cited:7
Area	FISMAT
Afiliação	Instituto de Fisica, Universidade Estadual de Campinas Instituto Politécnico do Rio de Janeiro
Usuário Avançado	marciana
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art. 38

Tipo da Referência	Journal Article
Autor(es)	Pereira, A. C. Zerbetto, M. Silva, G. C. Vargas, H. Silva, W. J. da Neto, G. de O. Cella, N. Miranda, L. C. M.
Título	OPC technique for in vivo studies in plant photosynthesis research
Revista	Measurement Science and Technology
Mês	Sep.
Ano	1992
Volume	3
Número	9
Páginas	931-934
Palavras-Chave	photoacoustic technique
Resumo	The open photoacoustic cell (OPC) technique is applied to photosynthesis research in leaves, where the leaf is still attached to the plant. It is shown that real in situ and in vivo measurements of photosynthetic activities in leaves can be performed. The dehydration effect after cutting the leaf from the plant was monitored and some qualitative measurements related to photosynthetic activities are reported in order to show the usefulness of this technique in this field.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:15 , Times Cited:13
Area	FISMAT
Grupo(s)	LAS
Afiliação	Universidade Estadual de Campinas Instituto Politécnico do Rio de Janeiro Laboratório de Sensores e Materiais, Instituto Nacional de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 39

Tipo da Referência	Journal Article
Autor(es)	Silva, W. J. da Vidal, B. C. Martins, M. E. Q. Vargas, H. Pereira, A. C. Zerbetto, M. Miranda, L. C. M.
Título	What makes popcorn pop
Revista	Nature
Mês	Apr.
Ano	1993
Volume	362
Número	6419
Páginas	417
Palavras-Chave	Zea , Mays
Resumo	Corn and popcorn belong to the same plant species Zea mays mays , but only popcorn pops. Previous studies on this question have been restricted to popcorn fruits and have demonstrated that pericarp (hull) and starch are important for popping.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:6 , Times Cited:5
Area	FISMAT
Grupo(s)	LAS
Afiliação	Universidade Estadual de Campinas, Instituto de Física e Biologia Instituto de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais
Usuário Avançado	marciana
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art. 40

Tipo da Referência	Journal Article
Autor(es)	Pereira, A. C. Neto, G. O. Vargas, H. Cella, N. Miranda, L. C. M.
Título	On the use of the open photoacoustic cell technique for studying photosynthetic O2 evolution of undetached leaves: Comparison with Clark-type O2 electrode
Revista	Review of Scientific Instruments
Mês	May
Ano	1994
Volume	65
Número	5
Páginas	1512-1516
Palavras-Chave	photoacoustic cell technique
Resumo	The leaf photosynthetic O2 evolution detected by the open photoacoustic cell (OPC) technique is compared to the measurements using a Clark-type O2 electrode detector. In vivo and in situ measurements were carried out with undetached maize leaves. From the correlation between these two methods the possibility of a calibration is proposed for the oxygen evolution OPC signal.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:12 , Times Cited:7
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Física, Universidade Estadual de Campinas Instituto Politécnico, Universidade Estadual do Rio de Janeiro Laboratório Associado de Sensores e Materiais, Instituto de Pesquisas, Espaciais
Usuário Avançado	marciana
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art. 41

Tipo da Referência	Journal Article
Autor(es)	Silva, W. J. da Prioli, L. M. Magalhães, A. C. N. Pereira, A. . Vargas, H. Mansanares, A. M. Cella, N. Miranda, L. C. M. Alvarado-Gil, J.
Título	Photosynthetic O2 evolution in maize inbreds and their hybrids can be differentiated by open photoacoustic cell technique
Revista	Plant Science
Ano	1995
Volume	104
Número	2
Páginas	177-181
Palavras-Chave	Heterosis; Maize; Zea mays L; Photosynthesis; Photoacoustic
Resumo	Photosynthetic efficiency is considered one of the traits potentially suitable to differentiate hybrids from their inbred lines. Previous evaluations concerning photosynthetic efficiencies of maize (Zea mays L.) plants in the field have shown inconsistent and contradictory data. In this work, we attempted to study photosynthetic O2 evolution through photo-acoustic spectroscopy in intact undetached leaves of dark-adapted seedlings of inbreds and their hybrids. The results indicate that photosynthetic efficiencies of inbreds and hybrids can be differentiated by photoacoustic measurements of oxygen evolution, providing a parameter that might prove useful in evaluating plant genotypes.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 13, Times Cited: 11
Area	FISMAT
Grupo(s)	LAS
Afiliação	Instituto de Biologia, Universidade Estadual de Campinas Instituto de Biologia/CBMEG, Universidade Estadual de Campinas Instituto de Física, Universidade Estadual de Campinas Instituto Politécnico, Universidade do Estado do Rio de Janeiro Laboratório Associado de Sensores e Materiais, Instituto Nacional de Pesquisas Espaciais Centro de Investigación y Estudios Avanzados, IPN
Usuário Avançado	marciana
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art. 42

Tipo da Referência	Journal Article
Autor(es)	Yanezlimon, M. Rodriguez, M. E. Alvara do Gil, J. J. Zelayaangel, O. Sanchezsinencio, F. Cruz Orea, A. Vargas, H. Figueroa, J. D. C. Martinezbustos, F Martinez, J. L. Gonzalez Hernandez, J. Arguello, C. Miranda, L. C. M.
Título	Photoacoustic measurements of thermal-diffusivity and correlation with viscosity of instant corn dry masa flour
Revista	Analyst
Mês	July
Ano	1995
Volume	120
Número	7
Páginas	1953-1958
Palavras-Chave	Photoacoustic spectroscopy, Thermal properties , Instant corn masa, Lime content, Viscosity
Resumo	The usefulness of the photoacoustic technique for the characterization of thermal properties and for the monitoring of the pasting effect of added water and lime on instant corn masa flour is discussed. In particular, it is shown that the photoacoustically measured thermal diffusivity follows closely the change in the sample viscosity, as a function of the lime content.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:17 , Times Cited:10
Area	FISMAT
Grupo(s)	LAS
Afiliação	Inst Politecn Ncl,Ctr Invest & Estudios Avanzados,Dept Fis., IPN,Ctr Invest & Estudios Avanzados,Programa Multidisciplinario Mat Avanzados Instituto Nacional Pesquisas Espaciais
Usuário Avançado	marciana
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art. 43

Tipo da Referência	Journal Article
Autor(es)	Acosta-Avalos, D. Alvarado-Gil, J. J. Vargas, H. Frías-Hernández, J. Olalde-Portugal, V. Miranda, L. C. M.
Título	Photoacoustic monitoring of the influence of arbuscular mycorrhizal infection on the photosynthesis of corn (Zea mays L.),
Revista	Plant Science
Mês	Sep.
Ano	1996
Volume	119
Número	1-2
Páginas	183-190
Repositório	<sid.inpe.br/marciana/2003/04.28.15.42>
Palavras-Chave	Fungus colonization; Oxygen evolution; Photoacoustic technique
Resumo	The general utility of the photoacoustic effect is demonstrated by examining in vivo and in situ, for the first time, the influence of arbuscular mycorrhizal infection on the photosynthetic activity of intact maize leaves. Experiments correlating the photosynthetic O2 evolution, after a dark induction period, through the photoacoustic effect in mycorrhizal and non-mycorrhizal maize plants with their field performance show very consistent data. The influence of the arbuscular mycorrhizal infection on the photosynthetic efficiency is discussed. This methodology opens the possibility for early evaluation of the effect of fungi symbiotic adaptation with maize plants. For the arbuscular mycorrhizal-maize plant system, photoacoustics represents an extremely helpful technique for discarding low performance materials.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 18, Times Cited: 5
Area	FISMAT
Grupo(s)	LAS
Afiliação	Departamento de Fisica, Centro de Investigación y Estudios Avanzados del IPN, Mexico Programa Multidisciplinario en Ciencias Aplicada y Tecnologia Avanzada, Centro de Investigatión y de Estudios Avanzados del IPN, Mexixo Instituto Nacional de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 44

Tipo da Referência	Journal Article
Autor(es)	Balderas-López, J. A. Gutiérrez-Juárez, G. Alvarado-Gil, J. J. Frías-Hernández, J. Olalde-Portugal, V. Miranda, L. C. M. Silva, M. D. Delgadillo, I. Vargas, H.
Título	A new CO2 analyzer for measuring respiration rates in organic material
Revista	Review of Scientific Instruments
Mês	Oct.
Ano	1996
Volume	67
Número	10
Páginas	3732-3736
Palavras-Chave	organic material
Resumo	In this article, we present a new CO2 analyzer which can be used for monitoring respiration rates in organic material. To demonstrate the potentiality of the analyzer, CO2 evolution of soil samples collected from three different edaphic environments were measured. The results obtained with this compact CO2 analyzer were compared with those carried out simultaneously using the chemical method, and the correlation between them has been established.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:12 , Times Cited:1
Area	FISMAT
Grupo(s)	LAS
Afiliação	Depto. de Física, CINVESTAV-IPN CINVESTAV-IPN, Unidad Irapuato Laboratorio de Sensores e Materiais, Instituto Nacional de Pesquisas Espaciais PMCATA, CINVESTAV-IPN
Usuário Avançado	marciana
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art. 45

Tipo da Referência	Journal Article
Autor(es)	Cruz-Orea, A. Delgadillo, I. Vargas, H. Pichardo, J. L. Alvarado-Gil, J. J. Miranda, L. C. M.
Título	On the use of the photoacoustic technique for the measurement of the thermomechanical properties of semiconductor two-layer systems
Revista	Solid State Communications
Mês	Dec.
Ano	1996
Volume	100
Número	12
Páginas	855-859
Palavras-Chave	Semiconductors; Heat conduction; Thermal expansion
Resumo	The photoacoustic technique is used in semiconductor two-layer systems for the determination of thermal properties and thermal expansion coefficient. The two-layer systems studied were amorphous silicon-glass and Al0.2Ga0.8As-GaAs. Our results show that the proposed method is a reliable technique for the characterization of other semiconductor two-layers systems.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 11, Times Cited: 0
Area	FISMAT
Grupo(s)	LAS
Afiliação	Programa Multidisciplinario de Ciencias Aplicadas y Tecnología Avanzada, Centro de Investigatión y de Estudios Avanzados del IPN, Mexico Departamento de Física, Centro de Investigación y de Estudios Acanzados del IPN Instituto Nacional de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 46

Tipo da Referência	Journal Article
Autor(es)	Rodriguez, M. E. YanezLimon, M. Alvarado Gil, J. J. Vargas, H. Sanchez Sinencio, F. Figueroa, J. D. C. Martinez Bustos, F. Martinez Montes, J. L. GonzalezHernandez, J. Silva, M. D. Miranda, L. C. M.
Título	Influence of the structural changes during alkaline cooking on the thermal, rheological, and dielectric properties of corn tortillas
Revista	Cereal Chemistry
Mês	Sep.-Oct.
Ano	1996
Volume	73
Número	5
Páginas	593-600
Palavras-Chave	Photoacoustic measurement, Diffusivity, Starch, Water, Crystallization
Resumo	Basic data on thermal, dielectric, and infrared spectra properties of cooked tortillas were investigated with the aim of understanding the role of lime, Ca(OH)(2), that is incorporated during the alkaline cooking process. The data are further supplemented by X-ray diffraction and texture measurements. The changes in the thermal diffusivities, as measured by the photoacoustic technique, as well as changes in texture, X-ray patterns, dielectric, and infrared spectra properties are presented as a function of the lime concentration. The results show strong evidence that there is a marked concentration of lime at approximate to 0.2% above and below where there are different behavior patterns of the measured properties of tortilla. In particular, the results of the study of dielectric constants and thermal diffusivity provide strong evidence for an enhancement of the starch crosslinking taking place at a lime content of approximate to 0.2%.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:31 , Times Cited:9
Area	FISMAT
Grupo(s)	LAS
Afiliação	Inst. Politecn. Nacl., Ctr. Invst & Estudios Avanzados Dept. Fis, Univ Autonoma Queretaro,Fac. Quim.,Lab. Invest. Mat. Laboratório de Sensores e Materiais, Instituto Nacional de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 47

Tipo da Referência	Journal Article
Autor(es)	Alvarado-Gil, J. J. Vargas, H. Sanchez Sinencio, F. Gonzalez Hernandez, J. Miranda, L. C. M.
Título	Effect of lime content on the processing conditions of cooked maize tortillas: Changes of thermal, structural, and rheological properties
Revista	Optical Engineerig
Mês	Feb.
Ano	1997
Volume	36
Número	2
Páginas	348-357
Palavras-Chave	photoacoustic, photothermal science, engineering, lime, biopolymers, thermal diffusivity measurements, x-ray
Resumo	Basic data on thermal, dielectric, and IR spectral properties of cooked tortillas were investigated with the major aim to understand the role of lime, Ca(OH)(2), incorporated during the alkaline cooking process. The data are further supplemented by x-ray diffraction and texture measurements. The changes in the thermal diffusivities, measured by the photoacoustic technique, as well as the changes in texture, x-ray patterns, dielectric, and IR spectral properties are presented as a function of the lime concentration. The results show strong evidence that there is a marked concentration of lime (around 0.2%) above and below which different behavior patterns of the measured properties of tortilla were observed. in particular, the results for the dielectric constant and thermal diffusivity provide strong evidences for enhanced starch crosslinking taking place for lime content close to 0.2%.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E> WEBSCI: Cited Reference: 28, Times Cited: 5
Area	FISMAT
Grupo(s)	LAS
Afiliação	Inst. Politecn Nalc, CTR Invest and Estudios Avanzados, PMCATA, Mexico Univ Autonom Queretaro, Lab. Invest Mat, Quim, Mexico Instituto Nacional de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais
Usuário Avançado	marciana
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art. 48

Tipo da Referência	Journal Article
Autor(es)	Calderón, A. Alvarado-Gil, J. J. Gurevich, Yu. G. Cruz-Orea, A. Delgadillo, I. Vargas, H. Miranda, L. C. M.
Título	Photothermal Characterization of Electrochemical Etching Processed n-Type Porous Silicon
Revista	Physical Review Letters
Mês	Dec.
Ano	1997
Volume	79
Número	25
Páginas	5022-5025
Palavras-Chave	temperature, Electrochemically, Porous silicon material
Resumo	The room temperature thermal diffusivity evolution of electrochemically formed porous silicon as a function of the etching time is investigated. The measurements were carried out using the open-cell photoacoustic technique. The experimental data were analyzed using a composite two-layer model. The results obtained strongly support the existing studies, indicating the presence of a high percentage of SiO2 in the composition of porous silicon material.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 21, Times Cited: 15
Area	FISMAT
Grupo(s)	LAS
Afiliação	Departimento de Fisica, CINVESTAV-IPN Laboratorio de Ciencias Fisicas, Universidade Estadual do Norte Fluminense Laboratorio de Sensores e Materials, Instituto Nacional de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 49

Tipo da Referência	Journal Article
Autor(es)	Delgadillo, I. Cruz-Orea, A. Vargas, H. Calderón, A. Alvarado-Gil, J. J. Miranda, L. C. M.
Título	Photoacoustic technique for monitoring the thermal properties of porous silicon
Revista	Optical Engineerig
Mês	Feb.
Ano	1997
Volume	36
Número	2
Páginas	343-347
Palavras-Chave	Photoacoustic technique, Thermal properties, Porous silicon
Resumo	The use of the photoacoustic technique to monitor the thermal properties of materials that can be obtained only as parts of multicomponent samples is illustrated by performing the thermal characterization of two porous materials: porous silicon obtained from n-type crystalline silicon through the spark process and that obtained through the electrochemical etching method. This nonseparative, and hence nondestructive, approach makes use of an effective thermal diffusivity treatment based on the analogy between thermal and electrical resistances, in combination with simplified compositional models for the corresponding multicomponent systems. The thermal parameters obtained are in agreement with existent studies concerning the composition of these materials. This approach offers the possibility of performing the thermal characterization of other porous semiconductors and analogous materials.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E> WEBSCI: Cited Reference: 26, Times Cited: 4
Area	FISMAT
Grupo(s)	LAS
Afiliação	Inst. Politecn Nalc, CTR Invest and Estudios Avanzados, PMCATA, Mexico Instituto Nacional de Pesquisas Espaciais, Laboratório Associado de Sensores e Materiais
Usuário Avançado	marciana
atualizar

art. 50

Tipo da Referência	Journal Article
Autor(es)	Veleva, L. Tomás, S. A. Marín, E. Cruz-Orea, A. Delgadillo, I. Alvarado-Gil, J. J. Quintana, P. Pomés, R Sánchez, F. Vargas, H. Miranda, L. C. M.
Título	On the use of the photoacoustic technique for corrosion monitoring of of metals: Cu an Zn oxides formed in tropical envirnments
Revista	Corrosion Science
Mês	Sep.
Ano	1997
Volume	39
Número	9
Páginas	1641-1655
Palavras-Chave	Zinc, Atmospheric Corrosion, Copper patinas, Differential reflectometry, Thermal diffusivity, X-ray, Atmosphere, Spectroscopy
Resumo	Samples of electrolytical copper and zinc were exposed for nine months to a naturally occurring marine environment of the Yucatan Peninsula in Mexico and were analysed without any additional pretreatment. The study is mainly based upon the measurements of the samples thermal properties by using the non-destructive photoacoustic technique. The thermal diffusivity may determine with a conventional open photoacoustic cell and the thermal effusivity using a new experimental configuration.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E> WEBSCI: Cited Reference: 38, Times Cited: 4
Area	FISMAT
Grupo(s)	LAS
Afiliação	Depto. de Física Aplicada, CINVESTAV-Mérida, PMCATA, CINVESTAV-México Instituto Nacional de Pesquisas Espaciais
Usuário Avançado	marciana
atualizar

art. 51

Tipo da Referência	Journal Article
Autor(es)	Guarcia-Quiroz, A. Tomas, S A Vargas, H Cruz-Orea, A Alvarado-Gill, J. J. Velava, L. Miranda, L. C. M.
Título	Photoacoustic spectroscopy of corrosion products of copper formed in tropical environments
Revista	Instrumentation Science and Technology
Ano	1998
Volume	26
Número	2-3
Páginas	241-260
Palavras-Chave	Differential reflectrometry, Thermal diffusivity, X-ray, Atmosphere, Patina, NAZN4CL(OH)6SO4.6H2O, ZN4CL2(OH)4SO4.5H2O, glasses, samples, zincs
Resumo	The evolution of thermal properties of copper samples, as a function of exposure time to a corroding atmosphere, is investigated in detail. The samples were exposed to a natural marine environment of the Yucatan Peninsula in Mexico and were analyzed without any additional pretreatment. The study is mainly based upon the measurements of thermal and optical properties of the sample, using the non-destructive photoacoustic technique. The thermal diffusivity was measured with a conventional open photoacoustic cell arrangement, whereas the thermal effusivity was determined using a new experimental configuration.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:45 , Times Cited:2
Area	FISMAT
Grupo(s)	LAS
Afiliação	IPN, CNVESTAV, Dept. Fís. Mexico IPN, CNVESTAV,PMCATA Mexico IPN, CNVESTAV, Dept. Fís Aplicada Mexico Instituto de Pesquisas Espaciais, Laboratório Asssociado de Sensores e Materiais
Usuário Avançado	marciana
atualizar

art. 52

Tipo da Referência	Journal Article
Autor(es)	Tomás, S. A. Sammiguel, R. E. Cruz-Orea, A Gomes da Silve, M. Sthel, M. S. Vargas, H. Miranda, L. C. M.
Título	Photoacoustic detection of water vapour permeability in ZrO2-TiO2 ceramic
Revista	Measurement Science and Technology
Mês	May
Ano	1998
Volume	9
Número	5
Páginas	803-808
Palavras-Chave	Thermal-diffusive, Volatile liquid, Solis, Signal, Enhancement, Cell, Gas
Resumo	The photoacoustic detection of water vapour permeability in solids is discussed. We propose a new experimental configuration in which the photoacoustic heat source is located at the cell’s optical entrance window, rather than at the sample–transducer gas interface. It is claimed that only the sample permeability property is experimentally accessed in the new configuration. The experimental arrangement is tested by measuring the water vapour permeability of a ZrO2–TiO2 ceramic sample. In these measurements we were able to detect changes in the air molar concentration of water as small as 1.1%, with a resolution better than 0.5%, corresponding to the lowest relative humidity used in our measurements.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:25 , Times Cited:2
Area	FISMAT
Afiliação	Departamento de Física, Centro de Investigacíon y Estudios Avanzados del IPN, Mexico Laboratório de Ciências Físicas,m Centro de Ciências e Tecnologia, Universidade Estadual do Norte Fluminense Departamento de Física, Universidade de Concepción, Chile
Usuário Avançado	marciana
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art. 53

Tipo da Referência	Journal Article
Autor(es)	Frias-Hernandez, J. T. Aguilar-Ledezma, A. L. Olalde-Portugal, V. Balderas-Lopez, J. A. Gutierrez-Juarez, G. Alvarado-Gil, J. J. Castro, J. J. Vargas, H. Albores, A. Dendooven, L. Balderas-Lopez, J. A. Miranda, L. C. M. Frias-Hernandez, J. T.
Título	Soil characteristics in semiarid highlands of central Mexico as affected by mesquite trees (Prosopis laevigata)
Revista	Arid Soil Reseaarch and Rehabilitation
Mês	July-Set.
Ano	1999
Volume	13
Número	3
Páginas	305-312
Repositório	<sid.inpe.br/marciana/2003/05.02.12.42>
Palavras-Chave	fertility islands, leguminous tree, soil microflora, soil nutrients
Resumo	In the semiarid highlands of central Mexico the mesquite tree (Prosopis laevigata) is often removed for agricultural and forestry purposes. Clearing of land for agricultural purposes has a significant impact on soil processes and nutrient dynamics and, ultimately, on crop production. We have studied the effect of the mesquite tree on soil respiration, amounts of bacteria, fungi, and actinomycetes, and soil characteristics. Soil was sampled from three distinct locations: under the canopy of the mesquite tree, in the area surrounding the mesquite tree but not covered by its canopy, and in adjacent cultivated land. It was found that the mesquite tree plays an important role in nutrient cycling in arid and semiarid regions. Soil microorganisms and nutrients (N, P, and Fe) were more abundant under the canopy of the mesquite tree than in the surrounding area and in the adjacent arable soil.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:26 , Times Cited:1
Area	FISMAT
Afiliação	Inst Politecn Nacl, Ctr Invest & Estudios Avanzados Dept Biotechnol & Bioengn, PN, CINVESTAV, Dept Biochem & Biotechnol, Unidad Iraputo
Usuário Avançado	marciana
atualizar

art. 54

Tipo da Referência	Journal Article
Autor(es)	Lima, J. A. P. Marín, E. Correa, O. Silva, M. G. da Cardoso, S. L. Gatts, C. Rezende, C. E. Vargas, H. Miranda, L. C. M.
Título	Measurement of the thermal properties of liquids using a thermal wave interferometer
Revista	Measurement Science and Technology
Mês	Oct.
Ano	2000
Volume	11
Número	10
Páginas	1522-1526
Palavras-Chave	Thermal properties, Liquids
Resumo	In this paper we discuss the use of an alternative photothermal technique for measurements of thermal properties of liquids. The proposed technique is based upon the concept of thermal wave interferometry. The liquid sample is confined between two thin pyroelectric detectors. One of these detectors acts as a modulated absorber of light while the other is used for sensing the temperature fluctuations transmitted through the liquid layer. The good agreement between the values of the thermal properties we got with the present technique and those reported in the literature demonstrates the capability of the technique for full characterization of the thermal properties of liquids.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:25 , Times Cited:8
Area	FISMAT
Afiliação	Universidade Estadual do Norte Fluminense Departamento de Física, Universidade Estadual de Maringá
Usuário Avançado	marciana
atualizar

art. 55

Tipo da Referência	Journal Article
Autor(es)	Lima, J. A. P. Marín, E. Silva, M. G. da Sthel, M. S. Cardoso, S. L. Takeuti, D. F. Gatts, C. Vargas, H. Rezende, C. E. Miranda, L. C. M.
Título	On the use of the thermal wave resonator cavity sensor for monitoring hydrocarbon vapors
Revista	Review of Scientific Instruments
Mês	July
Ano	2000
Volume	71
Número	7
Páginas	2928-2932
Repositório	<sid.inpe.br/marciana/2003/04.29.11.34.44>
Resumo	A gas sensing device based on a thermal wave resonator cavity is outlined. It is experimentally tested by monitoring the presence of several hydrocarbon vapors in air via the measurement of the thermal diffusivity. It is also shown that its time-dependent response may be used to follow the vapor diffusion. It is shown that its characteristic response time is linearly correlated to the thermal diffusivity value of the mixture. The steps toward the development of a practical sensing device are further discussed.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Endereço de E-Mail	Centro de Ciência e Tecnología, Universidade Estadual do Norte Fluminense, Centro de Biología e Biotecnología, Universidade Estadual do Norte Fluminense, Departamento de Física, Universidade Estadual de Maringá
Divulgação	E WEBSCI: Cited Reference: 12, Times Cited:11
Area	FISMAT
Afiliação	Centro de Ciência e Tecnología, Universidade Estadual do Norte Fluminense Centro de Biología e Biotecnología, Universidade Estadual do Norte Fluminense Departamento de Física, Universidade Estadual de Maringá
Usuário Avançado	marciana
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art. 56

Tipo da Referência	Journal Article
Autor(es)	Lima, José A. P. Cardoso, Sergio L. Silva, Marcelo G. Sthel, Marcelo S. Gatts, Carlos E. N. Vargas, Helion Miranda, L. C. M.
Título	Thermal diffusivity as an automotive fuel characterization parameter: correlation with motor octane number
Revista	Industrial & Engineering Chemistry Research
Mês	Dec.
Ano	2001
Volume	40
Número	26
Páginas	6207 - 6212
Resumo	The standard method for evaluating the quality of automotive fuels is based on the determination of its motor octane number (MON) using the ASTM motor testing. The resulting figures of merit of this standard testing are known to be strongly linearly correlated to the fuels' vapor thermodynamic properties such as, for instance, their vapor pressure. In this paper we explore this strong correlation between the MON parameter and the fuels' vapor thermal properties to seek the development of an alternative low-cost method. The proposed method is based upon the photothermal measurement of the thermal diffusivity of the fuels' vapor in a closed air cell. It is found that the thermal diffusivity is well correlated with the corresponding MON values of the fuels investigated. The eventual improvements of the proposed method aimed at gaining accuracy and developing a portable device for field applications are also discussed.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	<E> WEBSCI: Cited Reference: 18, Times Cited: 1
Area	FISMAT
Afiliação	Centro de Ciência e Tecnologia, Universidade Estadual do Norte Fluminense Departamento de Física, Universidade Estadual de Maringá
Usuário Avançado	marciana
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art. 57

Tipo da Referência	Journal Article
Autor(es)	Lima, J. A. P. Marín, E. Silva, M. G. da Sthel, M. S. Schramm, D. U. Cardoso, S. L. Vargas, H. Miranda, L. C. M.
Título	Characterization of the thermal properties of gases using a thermal wave interferometer
Revista	Measurement Science and Technology
Mês	Nov.
Ano	2001
Volume	12
Número	11
Páginas	1949-1955
Palavras-Chave	Thermal properties, Gases, Thermal waves, Interferometer, Binary
Resumo	A method suitable for the thermal characterization of gases is described. It is based on thermal wave interference (TWI) in a cavity. A TWI device was constructed and the thermal diffusivity of different binary gas mixtures as a function of their relative concentration was measured. From these values, using a logarithm mixing model for the thermal conductivity of a two-phase gas system, the thermal properties of the corresponding pure gases were calculated. The data obtained for several test gases show good agreement with values reported in the literature.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:25 , Times Cited:1
Area	FISMAT
Afiliação	Centro de Ciencia e Tecnologia, Universidade Estadual do Norte Fluminense Departamento de Fisica, Universidade Estadual de Maringá
Usuário Avançado	marciana
atualizar

art. 58

Tipo da Referência	Journal Article
Autor(es)	Lima, J. A. P. Marín, E. Massunaga, M. S. O. Correa, O. Cardoso, S. L. Vargas, H. Miranda, L. C. M.
Título	Measurement of the thermal properties of liquid mixtures using a thermal wave interferometer
Revista	Applied Physics B Lasers and Optics
Ano	2001
Volume	73
Número	2
Páginas	151-155
Palavras-Chave	Thermal properties, Liquids
Resumo	In this paper we discuss the use of an alternative photothermal technique for measurements of thermal properties of liquid mixtures. The proposed technique is based upon the concept of a thermal wave interferometer. The liquid sample is confined between two thin pyroelectric detectors. One of these detectors acts as a modulated light absorber while the other is used for sensing the temperature fluctuations transmitted through the liquid layer. It is demonstrated that the proposed experimental configuration allows us to fully characterize the thermal properties of the constituent liquids.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 30 , Times Cited: 1
Area	FISMAT
Grupo(s)	LAS
Afiliação	Laboratório de Ciências Físicas, Universidade Estadual do Norte Fluminense Departamento de Física, Universidade Estadual de Maringá
Usuário Avançado	marciana
atualizar

art. 59

Tipo da Referência	Journal Article
Autor(es)	Lima, J. A. P. Marín, E. Silva, M. G. da Sthel, M. S. Cardoso, S. L. Vargas, H. Miranda, L. C. M.
Título	Application of the thermal wave resonator to the measurement of the thermal diffusivity of gas mixtures
Revista	Review of Scientific Instruments
Mês	Feb.
Ano	2001
Volume	72
Número	2
Páginas	1580-1582
Repositório	<sid.inpe.br/marciana/2003/04.29.11.35>
Resumo	A gas analyzer device based on thermal wave interference in a cavity is presented. The thermal diffusivity of CO2:air mixtures as a function of the relative concentration is measured. It is demonstrated that different concentrations of CO2 in air can be detected with accuracy using the described experimental device. The results presented here open the possibility to perform routine measurements of thermal diffusivity of binary gas mixtures and using this parameter to monitor the relative gas concentration.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 9, Times Cited:5
Area	FISMAT
Afiliação	Centro de Ciencia e Tecnologia, Universidade Estadual do Norte Fluminense Departamento de Física, Universidade Estadual de Maringá
Usuário Avançado	marciana
atualizar

art. 60

Tipo da Referência	Journal Article
Autor(es)	Lima, J. A. P. Silva, M. G. da Massunaga, M. S. O. Marín, E. Vargas, H. Miranda, L. C. M.
Título	Monitoring of hydrocarbon vapor diffusion in air using a thermal wave interferometer
Revista	Journal of Applied Physics
Mês	May
Ano	2002
Volume	91
Número	9
Páginas	5581-5586
Palavras-Chave	resonator cavity, sensor
Resumo	A discussion on the use of thermal wave interference (TWI) for the monitoring of the transients of hydrocarbon in air is presented. The thermal wave signal was modeled using the logarithm-mixing model for the thermal diffusivity of a two-phase gas system in which the hydrocarbon vapor concentration in the air-filled TWI cell is a varying function of time. The time varying hydrocarbon vapor concentration was described assuming the simple Fick's model for mass diffusion of the hydrocarbon vapor in the stagnant air column of the TWI cell. The transient TWI signal amplitude data fitting yielded two parameters, namely, the saturation concentration and the characteristic diffusion time. From the corresponding values of the diffusion time the hydrocarbon mass diffusivities were straightforwardly obtained. The obtained values for the hydrocarbon mass diffusivities were found to be in good agreement with the ones reported in the literature.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 18, Times Cited: 1
Area	FISMAT
Afiliação	Universidade Estadual Norte Fluminense, Centro de Ciencia & Tecnologia Universidade Estadual Maringa, Departamento Fisica
Usuário Avançado	marciana
atualizar

art. 61

Tipo da Referência	Journal Article
Autor(es)	Lima, J. A. P. Silva, M. G. da Masssunaga, M. S. O. Cardoso, S. L. Vargas, H. Marín, E. Miranda, L. C. M.
Título	Monitoring of gas diffusion in air using the TWI technique: Thermal diffusivity measurements made easy
Revista	Review of Scientific Instruments
Mês	Jan.
Ano	2003
Volume	74
Número	1
Páginas	842-844
Palavras-Chave	Wave resonator cavity, Sensor, Vapor, Thermal properties, Transport properties, Liquids, Gas
Resumo	The thermal wave interference technique (TWI) has been explored in recent years for the investigation of the thermal and transport properties of gases and liquids. In this article we address ourselves to the quantitative understanding of the transient thermal wave interference signal of air:hydrocarbon vapor mixtures. This is the situation one faces when placing a given portion of liquid hydrocarbon inside an initially air-filled thermal wave interference. What is observed in this case is the thermal wave interference signal decay as a function of the time as a result of the change of the gas thermal diffusivity with time due to the increase of the hydrocarbon vapor concentration in air. In this article we show that value of the thermal diffusivity of the saturated mixture is readily obtained from the saturation value of the normalized signal amplitude, without the need of performing the conventional L scan.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:7 , Times Cited:0
Area	FISMAT
Grupo(s)	LAS
Afiliação	Universidade Estadual do Norte Fluminense, Centro de Ciência e Tecnologia Facultad de Física, Universidad de La Habana, Cuba Instituto Nacional de Pesquisas Espaciais
Usuário Avançado	marciana
atualizar

art. 62

Tipo da Referência	Journal Article
Autor(es)	Lima, J. A. P. Silva, M. G. da Sthel, M. S. Cardoso, S. L. Vargas, H. Marín, E. Miranda, L. C. M.
Título	Measurement of mass diffusivity in air using thermal wave interference detection
Revista	Review of Scientific Instruments
Mês	Jan.
Ano	2003
Volume	74
Número	1 Part 2
Páginas	433-436
Palavras-Chave	resonator cavity, sensor,vapor
Resumo	A discussion on the use of the thermal wave interference (TWI) for the monitoring of the transient of hydrocarbon in air is presented. The thermal wave signal was modeled using the logarithm-mixing model for the thermal diffusivity of a two-phase gas system in which the hydrocarbon vapor concentration in the air-filled TWI cell is a varying function of time. The time varying hydrocarbon vapor concentration was described assuming the simple Fick's model for mass diffusion of the hydrocarbon vapor in the stagnant air column of the TWI cell. The transient TWI signal amplitude data fitting yielded two parameters, namely, the saturation concentration and the characteristic diffusion time. From the corresponding values of the diffusion time the hydrocarbon mass diffusivities were straightforwardly obtained.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:18 , Times Cited:0
Area	FISMAT
Grupo(s)	LAS
Afiliação	Universidade Estadual do Norte Fluminense, Centro de Ciência e Tecnologia Facultad de Física, Universidad de La Habana Instituto Nacional de Pesquisas Espaciais
Usuário Avançado	marciana
atualizar

art. 63

Tipo da Referência	Journal Article
Autor(es)	Vargas, H. Miranda, L. C. M.
Título	Photothermal techniques applied to thermophysical properties measurements (plenary)
Revista	Review of Scientific Instruments
Mês	Jan.
Ano	2003
Volume	74
Número	1
Páginas	794-799
Palavras-Chave	Thermal-wave resonator, Photoacoustic measurement, Cavity sensor, Diffusivity, Solids, Spectroscopy, Interferometer, Liquids, glasses, Mixtures, Transport properties
Resumo	In this article, we present a bird's eye view of applications of photothermal techniques for evaluation of the thermal properties of different materials. This is followed by the presentation of specific techniques for direct measurements of thermal diffusivity and thermal effusivity and indirect measurements of heat capacity. The presentation finishes by discussing the use of alternative photothermal techniques for the investigation of thermal and transport properties of gases and liquids.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference:60 , Times Cited:0
Area	FISMAT
Grupo(s)	LAS
Afiliação	Centro de Ciência e Tecnologia, Laboratório de Ciências Físicas, Universidade Estadual do Norte Fluminense Instituto Nacional de Pesquisas Espaciais
Usuário Avançado	marciana
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art. 64

Tipo da Referência	Journal Article
Autor(es)	Lima, J. A. P. Massunaga, M. S. O. Vargas, H. Miranda, L. C. M.
Título	Photothermal detection of adulterants in automotive fuels.
Revista	Analytical Chemistry
Mês	Jan.
Ano	2004
Volume	76
Número	1
Páginas	114-119
Palavras-Chave	thermal-wave resonator, diffusivity, cavity, interferometer, sensor, vapors, air
Resumo	In this paper, we describe a new, simple, and fast photothermal method for detecting the presence of adulterants in commercial gasolines. The method consists essentially of measuring the time evolution of the gasoline vapor in an originarily air-filled closed cell using a pyroelectric sensor. The transient photothermal signal amplitude data fitting yields two parameters, namely, a saturation signal amplitude and the characteristic time for approaching saturation. From the values, two figures of merit are defined. The method was tested with a universe of 210 commercial samples collected in different gas stations. It is shown that the proposed method has an uncertainty of 5.7%. This good accuracy, together with its simplicity and fast response, may render it useful for developing a portable device for fast checking in field analysis.
Site	<iris.sid.inpe.br:1914>
Idioma	English
Detentor da Cópia	SID/SCD
Divulgação	E WEBSCI: Cited Reference: 17, Times Cited: 0
Area	FISMAT
Afiliação	Universidade Estadual Norte Fluminense, Centro de Ciencia & Tecnologia Universidade Estadual Maringa, Departamento Fisica
Usuário Avançado	marciana
atualizar