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Search Results: 1 - 10 of 34865 matches for " 冯锡淇 "
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快响应表面电极热电探测器

科学通报 , 1981,
Abstract: 随着高功率CO_2脉冲激光器的应用日益发展,需要一种方便的测量脉冲波形和能量的探测器。近年来,热电探测器在这一领域内发展很快,热电探测器有面电极和边电极两种结构。其中边电极探测器的光谱响应受材料本身吸收特性的限制,但器件电容小,能经受大的辐射功率,因而可以在保持快响应速度的同时获得较高的峰值响应。不过,边电极器
铌酸锂晶体中一种新的OH~-吸收带

科学通报 , 1988,
Abstract: 铌酸锂(LiNbO_3)单晶和光波导在激光技术中被广泛用作电光、声光和非线性光学材料。但这类晶体中极易发生的光折变效应已成为进一步提高光电子器件性能的严重障碍。将大于4.6mol%MgO加入生长LiNbO_3晶体的一致熔化组分的熔体中,晶体抗光伤能力有成百倍的增加;而且已经判明,这一改进并不是由于光伏电流的减少,而是由于晶体光电导率的增加。
掺Cr和掺Pr的Bi_4Ge_3O_(12)晶体的线性光伏效应

科学通报 , 1992,
Abstract: 锗酸铋Bi_4Ge_3O_(12)(BGO)属于立方晶系,43m点群,是硅铋矿Bi_4Si_3O_(12)(BSO)的同型晶体。BGO晶体也是一种极好的闪烁材料,用于高能粒子或射线的探测。此外,Moya等报道了BGOCr是一种很有希望的光折变材料。
快响应表面电极热电探测器
,潘金才
科学通报 , 1981,
Abstract: 随着高功率CO2脉冲激光器的应用日益发展,需要一种方便的测量脉冲波形和能量的探测器。近年来,热电探测器在这一领域内发展很快,热电探测器有面电极和边电极两种结构。其中边电极探测器的光谱响应受材料本身吸收特性的限制,但器件电容小,能经受大的辐射功率,因而可以在保持快响应速度的同时获得较高的峰值响应。
掺镁、铁铌酸锂晶体的光吸收和ESR光谱研究
,张继周,应继锋,刘建成
红外与毫米波学报 , 1989,
Abstract: 取过渡金属铁作为“标记杂质”,以相近浓度分別加入未掺镁和高浓度掺镁(6.0mol%MgO)的一致熔化组分LiNbO_3晶体中,测量了它们的紫外吸收边、OH~-红外吸收光谱和Fe~(3+)的ESR光谱,并加以比较,其显著差异表明两种晶体中Fe~(3+)的离子环境发生了突变,据此定性地解释了光吸收和ESR的实验结果.
PZT95/5型铁电陶瓷材料的热释电效应研究
王永令,,林盛卫
红外与毫米波学报 , 1982,
Abstract: 本文研究PZT95/5型多晶固溶体在两个菱方铁电相间相变时的热释电性质。制备了掺Nb_2O_5和Sb_2O_3的两类Pb(Zr_(1-x)Ti_x) O_3(1.5≤x≤8)陶瓷,并进行了热释电性能测试。测得ZT-Nb-25组成的陶瓷在27℃~37℃温度范围的最高热释电系数达4.0×10~(-3)-~3Cm~(-2)K~(-1)。热释电系数、热滞和相变温度是采用电荷积分法和短路电流法进行测量的。本文最后讨论了相变时的热释电系数和剩余极化的变化。
THE CHARACTERISTICS OF EPITAXIAL p-n JUNCTIONS GROWN BY METHOD OF SILICON CARBIDE CRYSTALS SUBLIMATION
升华外延碳化硅p-n结的性质

FENG XI-QI,LUO BIN-ZHANG,
,骆宾章

物理学报 , 1980,
Abstract: Measurements of the voltage-current characteristics and space-charge capacitance have been made on the epitaxial p-n junctions grown by method of silicon carbidt crystals sublimation. An analysis of the forward voltage-current and voltage-capacitance charateristics shows that the structures of the p-n junction may vary over a quite wide range, from typical p-i-n junctions to nearly linear graded junctions resulted from different epitaxial growth parameters, but most of them have intermidiate structures. The effect of epitaxial growth parameters on structures of p-n junctions is briefly discussed.In addition, The brightness-current characteristics, the spectral distribution of electroluminescence of forward biased epitaxial p-n junctions, and their performance under pulse and a.c. excitions are also described.
Dipolar defect complexes in single-crystal PbWO4
钨酸铅晶体中的偶极缺陷

Feng Xi-Qi,Tong BTang,
,邓棠波

物理学报 , 2003,
Abstract: 在用阻抗谱研究PbWO4(PWO)晶体的介电特性时发现,掺La3+的PW O晶体中存在典型的介电弛豫现象,它被归因于La3+进入Pb位并与铅空位VPb缔合 成偶极缺陷.这一结果不仅清楚地证明了PWO晶体中铅空位的存在,而且表明阻抗谱测试可以成为PWO晶体微结构研究的有力工具.以阻抗谱测试为主要工具,结合光吸收谱(包括红外谱)和x射线光电子能谱,阐明了在异价掺杂离子(3+,4+,5+以及3+和5+双掺)掺杂的PWO晶体中
Progresses on the Studies of Lattice Defects in PbWO4 Scintillation CrystalsProgresses on the Studies of Lattice Defects in PbWO_4 Scintillation Crystals
钨酸铅PbWO4闪烁晶体缺陷研究进展

FENG Xiqi,YIN Zhiwen,
,殷之文

无机材料学报 , 1997,
Abstract: An introduction of recent progresses on the studies of lattice defects in lead tungstate crystals is presented. These results demonstrate the importance of taking into consideration in influence of lattice defects on performance of PWO scintillators. The relation among nonstoichiometry, crystal structure / polymorphism, impurity effects, oxygen composition and properties of scintillators is briefly discussed on peculiarities of PWO crystals.
Progress on the Studies of Structure in PWO4 Scintillation Crystals
钨酸铅(PbWO4)闪烁晶体的结构研究进展

LIN Qi-Sheng,FENG Xi-Qi,
林奇生
,

无机材料学报 , 2000,
Abstract: This paper presents the introduction of recent progress on the studies of structure in lead tungstate crystals. The results demonstrate the polymorphous and non-stoichiometric characters and the importance of structure in researching of lead tungstate crystals.
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