Concept

Spectrophotométrie

Publications associées (104)

Predicting transmittance spectra of electrophotographic color prints

Roger Hersch, Patrick Emmel, Safer Mourad

For dry toner electrophotographic color printers, we present a numerical simulation model describing the color printer response based on a physical characterization of the different electrophotographic process steps. The proposed model introduces a Cross T ...

Society of Photo-Optical Instrumentation Engineers2001

Role of urban and suburban aerosols on solar UV radiation over Athens, Greece

Hubert van den Bergh, Bertrand Calpini

The scope of this paper is to provide an exptl. and modeling contribution on the role of suspended lower tropospheric particles to the UV spectral irradiance reaching the ground in urban environments. The UV spectral irradiance was measured with a UV spect ...

1998

A combined determination of wind velocities and ozone concentrations for a first measurement of ozone fluxes with a DIAL instrument during the MEDCAPHOT-TRACE campaign

Hubert van den Bergh

From a data set collected during the MEDCAPHOT-TRACE field campaign, we demonstrate that ozone fluxes can be detd. with a shot-per-shot DIAL instrument operated in the UV spectral region. This is done by the simultaneous reconstruction of ozone concns. and ...

1998

Ozone flux measurements in the troposphere with a shot per shot DIAL instrument operated in the UV spectral region during the MEDCAPHOT campaign

Hubert van den Bergh, Bertrand Calpini, Alain Clappier

The first combined reconstruction of range-resolved wind velocities and O3 concns. is presented from the anal. of a single DIAL data set analyzed with a correlation method to det. wind speeds. The system can be used for the measurement of a unique componen ...

Springer1997

Far-infrared dielectric response of PbTiO3 and PbZr1-xTixO3 thin ferroelectric films

Nava Setter

Far-infrared transmittance and reflectance of PbTiO3, PbZr0.53Ti0.47O3 and PbZr0.75Ti0.25O3 thin films deposited by a sol-gel technique on sapphire substrates were measured between room temperature and 650 degrees C. The spectra were fitted with a classica ...

1995

Quantitative Diffuse Reflectance and Diffuse Transmittance Infrared Spectroscopy of Surface-Derivatized Silica Powders

Hubert van den Bergh, Jacques-Edouard Moser

Absolute diffuse reflectance and transmittance FT-IR spectra of optically thin layers of surface-derivatized silica powders are measured, using a photopyroelectric detector placed in direct contact with the sample. The role of inhomogeneities in the surfac ...

1994

Fourier transform infrared spectroscopic study of carbon dioxide methanation on supported ruthenium

Michael Graetzel, Albert Renken, Ravindranathan Thampi

Diffuse-reflectance IR Fourier transform (DRIFT) spectroscopy was used to study in situ, the low-temp. (T

1991

A Fourier Transform Infrared Spectroscopic Study of CO2 Methanationon Supported Ruthenium

Albert Renken, Ravindranathan Thampi

Diffuse-reflectance infrared Fourier transform (DRIFT) spectroscopy has been used to study in situ, the low-temperature (T < 200°C) methanation of CO2 over Ru on TiO2 supports and on Al2O3. For 3.8% Ru/TiO2, the reaction exhibits an activation energy (Ea) ...

1991

In-situ drift spectroscopy in a continuous recycle reactor: a versatile tool for catalytic process research

Albert Renken

Diffuse Reflectance IR Fourier-Transform (DRIFT) spectroscopy is an increasingly popular technique in catalysis research as it permits in situ observation of the reactor bed in powd. or granular form. However, DRIFTS in its conventional form suffers from t ...

1991

Diffuse-reflectance FTIR spectroscopy for kinetic and mechanistic studies of carbon dioxide hydrogenation in a continuous recycle reactor

Albert Renken

CO2 methanation over Ru/TiO2 was studied by using a diffuse-reflectance IR cell coupled with a continuous-feed recycle reactor. Metal-adsorbed CO is a major reaction intermediate and at 120 Deg occupies approx. 40% of the available Cu surface, while CH4 fo ...

1991

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