The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform
I. A. Sokolov - One of the best experts on this subject based on the ideXlab platform.
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Temperature dependence of the relaxation time of photoconductivity and non-steady-state photocurrents in photorefractive Bi12SiO20 grown in an oxygen-Free Atmosphere
Applied Physics Letters, 1999Co-Authors: M. A. Bryushinin, A. A. Petrov, I. A. SokolovAbstract:We present temperature measurements of the non-steady-state photocurrent and photoconductivity relaxation time in photorefractive sillenite crystal Bi12SiO20 grown in an oxygen-Free Atmosphere. The obtained dependencies are explained using a conventional model of semiconductor crystal with shallow energy level. The activation energy of shallow level obtained from photocurrent measurements was found to be ET=(0.45±0.11) eV. Independent measurements of the temperature dependence of the relaxation time of photoconductivity are in reasonable agreement with this estimation and give the value for ET equal to (0.56±0.01) eV.
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Photoconductive properties of photorefractive sillenites grown in an oxygen-Free Atmosphere
Journal of the Optical Society of America B, 1999Co-Authors: Elena V. Mokrushina, M. A. Bryushinin, V. V. Kulikov, A. A. Petrov, I. A. SokolovAbstract:We report on non-steady-state photocurrent measurements of photorefractive sillenites grown in an oxygen-Free Atmosphere. A sufficient increase in the photoconductivity of crystals grown in an argon Atmosphere in the red region of the spectrum (λ=633 nm) was observed. We attribute such changes to the high density of oxygen vacancies, and we present investigations of the influence of oxygen vacancies on the energy spectrum and on the parameters of photoinduced carriers in photorefractive sillenites.
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Temperature dependence of the non-steady-state photocurrents in Bi12SiO20 grown in an oxygen-Free Atmosphere
Advances in Photorefractive Materials Effects and Devices, 1999Co-Authors: M. A. Bryushinin, A. A. Petrov, I. A. SokolovAbstract:We investigate temperature dependence of the non-steady-state photocurrents and photoconductivity relaxation time in Bi12SiO20 crystal grown in an oxygen-Free Atmosphere. The activation energy of shallow level obtained from photocurrent measurements is ET = (0.45± 0.11) eV. Independent measurements of the temperature dependence of the relaxation time of photo-conductivity are in reasonable agreement with this estimation and give the value for ET = (0.56±0.01) eV.
M. A. Bryushinin - One of the best experts on this subject based on the ideXlab platform.
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Temperature dependence of the relaxation time of photoconductivity and non-steady-state photocurrents in photorefractive Bi12SiO20 grown in an oxygen-Free Atmosphere
Applied Physics Letters, 1999Co-Authors: M. A. Bryushinin, A. A. Petrov, I. A. SokolovAbstract:We present temperature measurements of the non-steady-state photocurrent and photoconductivity relaxation time in photorefractive sillenite crystal Bi12SiO20 grown in an oxygen-Free Atmosphere. The obtained dependencies are explained using a conventional model of semiconductor crystal with shallow energy level. The activation energy of shallow level obtained from photocurrent measurements was found to be ET=(0.45±0.11) eV. Independent measurements of the temperature dependence of the relaxation time of photoconductivity are in reasonable agreement with this estimation and give the value for ET equal to (0.56±0.01) eV.
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Photoconductive properties of photorefractive sillenites grown in an oxygen-Free Atmosphere
Journal of the Optical Society of America B, 1999Co-Authors: Elena V. Mokrushina, M. A. Bryushinin, V. V. Kulikov, A. A. Petrov, I. A. SokolovAbstract:We report on non-steady-state photocurrent measurements of photorefractive sillenites grown in an oxygen-Free Atmosphere. A sufficient increase in the photoconductivity of crystals grown in an argon Atmosphere in the red region of the spectrum (λ=633 nm) was observed. We attribute such changes to the high density of oxygen vacancies, and we present investigations of the influence of oxygen vacancies on the energy spectrum and on the parameters of photoinduced carriers in photorefractive sillenites.
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Temperature dependence of the non-steady-state photocurrents in Bi12SiO20 grown in an oxygen-Free Atmosphere
Advances in Photorefractive Materials Effects and Devices, 1999Co-Authors: M. A. Bryushinin, A. A. Petrov, I. A. SokolovAbstract:We investigate temperature dependence of the non-steady-state photocurrents and photoconductivity relaxation time in Bi12SiO20 crystal grown in an oxygen-Free Atmosphere. The activation energy of shallow level obtained from photocurrent measurements is ET = (0.45± 0.11) eV. Independent measurements of the temperature dependence of the relaxation time of photo-conductivity are in reasonable agreement with this estimation and give the value for ET = (0.56±0.01) eV.
Beate G. Liepert - One of the best experts on this subject based on the ideXlab platform.
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Excessive transmission of solar radiation through the cloud‐Free Atmosphere in GCMs
Geophysical Research Letters, 1998Co-Authors: Martin Wild, Beate G. LiepertAbstract:Large uncertainties exist in the distribution of solar radiation in the global climate system and its representation in General Circulation Models (GCMs). The present paper assesses the transmission of solar radiation through cloud-Free Atmosphere in three GCMs using information from direct observations at the surface. Clear-sky insolation climatologies have been constructed from hourly radiation data through composites of clear-sky episodes for seven sites in Germany with ten years of accurate measurements. The results suggest that GCMs overestimate clear-sky insolation at the surface, indicating that the cloud-Free Atmosphere is overly transparent to solar radiation in the models. Quantitatively, the annual mean overestimation for the German sites is on the order of 10 Wm−2 in the models which include an aerosol climatology and 30 Wm−2 in the models without aerosol. The GCM-predicted atmospheric water vapor content is abundant compared to the ECMWF Re-Analysis and therefore not considered responsible for the missing absorption in the model Atmosphere. Rather, understimated water vapor absorption in the GCM radiation codes is implied.
A. A. Petrov - One of the best experts on this subject based on the ideXlab platform.
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Temperature dependence of the relaxation time of photoconductivity and non-steady-state photocurrents in photorefractive Bi12SiO20 grown in an oxygen-Free Atmosphere
Applied Physics Letters, 1999Co-Authors: M. A. Bryushinin, A. A. Petrov, I. A. SokolovAbstract:We present temperature measurements of the non-steady-state photocurrent and photoconductivity relaxation time in photorefractive sillenite crystal Bi12SiO20 grown in an oxygen-Free Atmosphere. The obtained dependencies are explained using a conventional model of semiconductor crystal with shallow energy level. The activation energy of shallow level obtained from photocurrent measurements was found to be ET=(0.45±0.11) eV. Independent measurements of the temperature dependence of the relaxation time of photoconductivity are in reasonable agreement with this estimation and give the value for ET equal to (0.56±0.01) eV.
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Photoconductive properties of photorefractive sillenites grown in an oxygen-Free Atmosphere
Journal of the Optical Society of America B, 1999Co-Authors: Elena V. Mokrushina, M. A. Bryushinin, V. V. Kulikov, A. A. Petrov, I. A. SokolovAbstract:We report on non-steady-state photocurrent measurements of photorefractive sillenites grown in an oxygen-Free Atmosphere. A sufficient increase in the photoconductivity of crystals grown in an argon Atmosphere in the red region of the spectrum (λ=633 nm) was observed. We attribute such changes to the high density of oxygen vacancies, and we present investigations of the influence of oxygen vacancies on the energy spectrum and on the parameters of photoinduced carriers in photorefractive sillenites.
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Temperature dependence of the non-steady-state photocurrents in Bi12SiO20 grown in an oxygen-Free Atmosphere
Advances in Photorefractive Materials Effects and Devices, 1999Co-Authors: M. A. Bryushinin, A. A. Petrov, I. A. SokolovAbstract:We investigate temperature dependence of the non-steady-state photocurrents and photoconductivity relaxation time in Bi12SiO20 crystal grown in an oxygen-Free Atmosphere. The activation energy of shallow level obtained from photocurrent measurements is ET = (0.45± 0.11) eV. Independent measurements of the temperature dependence of the relaxation time of photo-conductivity are in reasonable agreement with this estimation and give the value for ET = (0.56±0.01) eV.
Tonghua Wang - One of the best experts on this subject based on the ideXlab platform.
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Synthesis of double-walled carbon nanotubes from coal in hydrogen-Free Atmosphere
Fuel, 2006Co-Authors: Jieshan Qiu, Zhiyu Wang, Zongbin Zhao, Tonghua WangAbstract:Abstract Double-walled carbon nanotubes (DWNTs) were synthesized from coal in large quantity by arc-discharge method in hydrogen-Free Atmosphere, which were systematically examined using scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy and Raman spectroscopy. The results show that the as-synthesized DWNTs have an outer diameter of 1.0–5.0 nm with an interlayer spacing in the tube walls of ca. 0.41 nm. The possible mechanism involved in the formation process of DWNTs is proposed and discussed in term of the unique chemical composition of coal and the process parameters adopted in the study.
