[100]金刚石薄膜的辐照响应特性研究

采用热丝辅助化学气相沉积(HFCVD)方法生长得到25μm厚的[100]取向金刚石膜,用以制备辐射探测器.在100 V偏压下,测得暗电流为16.1 nA,55Fe X射线(5.9 keV)和241Am α粒子(5.5 MeV)辐照下的净光电流分别为15.9nA和7.0nA.光电流随时间的变化先快速增加随后由于"pumping"效应逐渐达到稳定.X射线和α粒子辐照下的平均电荷收集效率分别为45;和19;,并由Hecht理论计算得到对应的电荷收集距离为11.25μm和4.75μm.     

高强度大动态范围高效率三倍频转换的数值模拟

对高强度大动态范围基频光入射以及偏振态发生部分变化的条件下,Ⅰ/Ⅱ角度失谐和Ⅱ/Ⅱ偏振失配（双倍频和双混频）两种高效三倍频方案的转换特性进行了数值模拟,结果表明在上述条件下Ⅰ/Ⅱ角度失谐方案优于Ⅱ/Ⅱ偏振失配方案。     

异价阳离子替代实现的金属卤化物CsCdCl3的明亮宽带绿色发光

全无机金属卤化物灵活多变的结构及优异的发光性能使其在固态光电子领域显示出重要的应用前景。本研究采用异价阳离子取代策略,用三价锑离子部分取代CsCdCl₃中的二价镉离子,促进自陷激子的产生,使CsCdCl₃∶Sb³⁺产生了明亮的宽带绿色发光,中心波长为530 nm。机理研究结果表明,CsCdCl₃∶Sb³⁺中相邻SbCl₆八面体被孤立,形成了低维电子构型,促进了Sb³⁺局域化,实现了量子效率最高为95.5%的高效发光。此外,尽管CsCdCl₃和RbCdCl₃均属于ACdCl₃(A为碱金属家族),但它们的晶体结构明显不同。RbCdCl₃属于正交晶系,空间群为Pnma;CsCdCl₃属于六方晶系,空间群为P6₃/mmc。CsCdCl₃的结构对称性大于RbCdCl₃,其...     

高峰值功率脉冲激光与石英光纤耦合的空气击穿问题

 研究了15 MW峰值功率脉冲激光与600 μm芯径石英光纤耦合中存在的空气击穿现象。对聚焦区域的空气击穿现象进行了理论和实验研究,测得空气击穿阈值为0.79×10⁹ W/cm²。测得固体介质的激光损伤阈值为2.12×10⁹ W/cm²,与理论计算结果相符。提出了七合一光纤耦合器用于解决空气击穿的办法,实验测得7根光纤并束的耦合效率为67.21%。结果表明光纤耦合器可有效解决15 MW峰值功率脉冲激光与600 μm芯径石英光纤的耦合。     

具V-不变凸性的一类多目标控制问题的混合对偶性

本文研究了一类多目标控制问题的混合对偶性.利用函数的广义V-不变凸性条件,得出了关于有效解的弱对偶定理、强对偶定理和严格逆对偶定理,推广了多目标控制问题的对偶性结论.     

直流光阴极注入器电子束壁损失初步研究

真空度被认为是影响GaAs阴极寿命的最重要参数之一,电子束在阴极附近的壁损失会导致真空度下降。基于高斯分布模型,研究了中国工程物理研究院自由电子激光相干强太赫兹源（FEL-THz）直流光阴极注入器电子束在束线管壁上的损失情况。通过理论分析、数值计算、束流动力学模拟、热力学分析及电子束初步出束实验研究,证明了FEL-THz电子束壁损失能达到W量级,必然引起真空度下降和阴极寿命缩短,这是目前限制出束的重要原因之一。研究表明,为维持电子束持续稳定工作,应将注入器阳极后的管道尺寸扩大到至少45 mm。     

Stability of efficiency evaluations in data envelopment analysis

Efficiency evaluations in data envelopment analysis are shown to be stable for arbitrary perturbations in the convex hulls of input and output data. Also, the corresponding restricted Lagrange multiplier functions are shown to be continuous. The results are proved using point-to-set mappings and a particular region of stability from input optimization.Research partly supported by National Science Foundation Grants, Office of Naval Research Grant, and by the Natural Sciences and Engineering Council of Canada.     

Ray Model of an Incident Gaussian Beam for Analyzing a Micro-Optical Communication Device with a GRIN Lens System

For the design of reliable micro-optical devices with a high coupling efficiency, a source-modeling method necessary for ray tracing is newly proposed. This method is based on the ray-division of an incident wavefront estimated by Gaussian beam optics. The simulation result obtained using the proposed method was compared with those of the conventional methods, and its accuracy was confirmed by the experimental results. Finally, the method was used to design a micro-optical device with two GRIN lenses and a thin-film filter.     

QSAR study on N-containing corrosion inhibitors: Quantum chemical approach assisted by topological index

In this paper, QSAR study on N-containing corrosion inhibitors has been made using quantum chemical approach assisted by a novel topological index (). Two models were obtained and their efficiency was examined using statistics. The results indicate that inhibition efficiencies relate to some parameters of corrosion inhibitors, such as E_homo, polarizability, Dipole, frontier orbital charge density, the interaction mode between inhibitors and metal surface (feedback donor–acceptor coordination bonds), (steric hindrance of molecules). Predicted values are consistent with the experimental ones on the whole. The residuals range within the experimental error. So the models can be used to predict inhibition efficiencies of the same type molecules.     

与节能

是在热力学和能源科学中出现的新概念，是评价能量价值的重要参数，它对能源的开发和合理利用具有重大的理论意义和实际意义．文章介绍了的概念、效率、分析法和的合理利用．