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PHOTOINDUCED BIREFRINGENCE AND NUMERICAL SOLUTION OF A NEW DYNAMIC MODEL IN AN AMORPHOUS COPOLYMER CONTAINING AZOBENZENE GROUPS

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Chinese Journal of Polymer Science 2001年第3期19卷 255-263页

作者： valerica ninulescu State Key Laboratory of Ultrafast Laser Spectroscopy Guangzhou 510275 China "Politehnica" University of Bucharest Physics Department Romania

Photoinduced birefringence is investigated in a new amorphous copolymer containing azobenzene groups. The levels of birefringence signal are found to depend an the polarization angle between the pump beam and the probe beam, and on the ellipticity of the pump beam. Both the growth and decay processes of the birefringence signal can be described by known biexponential equations. The rate constants and the amplitudes associated with the growth process of the photoinduced birefringence are observed to display a linear dependence with the pump beam intensity. A new dynamic model of the photoinduced birefringence is presented taking into account the contributions of both the bans and cis isomers of azobenzene groups and the local polymer segments. The numerical treatment of this model shows good agreement with the experimental data in the whole writing-erasing processes of the photoinduced birefringence conducted in our polymer samples.

关键词： photoinduced birefringence azobenzene polymer dynamic process numerical simulation

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Geometry Control of Photo-induced Microstructures in an Azobenzene

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Chinese Physics Letters 2001年第3期18卷 379-381页

作者： XU Ze-Da LI Zhen ninulescu valerica LIANG Li-Zhen PENG Zhuo-Lun CAI Zhi-Gang ZHOU Jian-Ying ZHANG Ling-Zhi LIANG Zhao-Xi State Key Laboratory of Ultrafast Laser Spectroscopy Zhongshan UniversityGuangzhou 510275 Institute of Polymer Science Zhongshan UniversityGuangzhou 510275 Department of Physics ‘Politehnica’University of BucharestBucharest 77206Romania

The mechanisms of photoinduced microstructures in an azobenzene polymer film are *** are based on the spatial periodic modulation of optical intensity and the photoisomerization of azobenzene molecules with the movement of main *** and theory jointly point out the possibility of photoinducing desired spatial microstructures in azobenzene organic polymer via adequate optical lattices and adequately polarized‘writing’beams.

关键词： benzene chains desired

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Numerical Analysis of an Industrial Polycrystalline Silicon Photovoltaic Module Based on the Single-Diode Model Using Lambert W Function

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Journal of Power and Energy Engineering 2019年第7期7卷 29-38页

作者： Mihai Razvan Mitroi valerica ninulescu Laurentiu Fara Dan Craciunescu University Politehnica of Bucharest BucharestRomania Academy of Romanian Scientists BucharestRomania

It is adopted the single-diode solar cell model and extended for a PV module. The current vs. voltage (I-V) characteristic based on the Lambert W-function was used. The estimation parameters for the simulation approach of the photovoltaic (PV) module make use of Levenberg-Marquardt method. It was considered an industrial polycrystalline silicon photovoltaic (PV) module and the simulated results were compared with the experimental ones extracted from a specific datasheet. The I-V characteristic for the analysed PV module and its maximum output power are investigated for different operating conditions of incident solar radiation flux and temperature, as well as parameters related to the solar cells material and technology (series resistance, shunt resistance and gamma factor). The analysis gives indications and limitations for design and optimization of the performance for industrial PV modules. This study can be implemented in any type of PV module.

关键词： Single-Diode Model Electrical Modeling I-V Characteristic Numerical Analysis Industrial PV Module Performance

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