自由空间中左手材料传输特性的仿真研究

研究了左手材料的传输和反射特性,介绍了所仿真的样品形式和测量系统,并采用高频构造仿真方法(HFSS)在已有自由空间宽频测量的基础上进行理论仿真。结果表明：S参量的数字仿真与实验测量结果在宽频条件下达到了较好的一致性;测量中产生的损耗主要归因于铜线结构有限的电导率;理论上左手材料的最佳无损工作频段应高于谐振环的谐振频率。     

Robust Laminated Anode with an Ultrathin Titanium Nitride Layer for High-Efficiency Top-Emitting Organic Light-Emitting Diodes

The effective reflective anode remains a highly desirable component for the fabrication of reliable top-emitting organic light-emitting diodes (TE-OLEDs) which have the potential to be integrated with complementary metal-oxide-semiconductor (CMOS) circuits for microdisplays. This work demonstrates a novel laminated anode consisting of a Cr/Al/Cr multilayer stack. Furthermore, we implement an ultra-thin titanium nitride (TiN) layer as a protective layer on the top of the Cr/Al/Cr composite anode, which creates a considerably reflective surface in the visible range, and meanwhile improves the chemical stability of the electrode against the atmosphere or alkali environment. Based on [2-(2-pyridinyl-N)phenyl-C](acetylacetonate)iridium(III) as green emitter and Mg/Ag as transparent cathode, our TE-OLED using the TiN-coated anode achieves the maximum current efficiency of 71.2 cd/A and the maximum power efficiency of 66.7 lm/W, which are 81% and 90% higher than those of the reference device without TiN, respectively. The good device performance shows that the Cr/Al/Cr/TiN could function as a promising reflective anode for the high-resolution microdisplays on CMOS circuits.     

低功耗互补传输门绝热逻辑和时序电路的设计

研究了采用二相非交叠功率时钟的绝热触发器及时序电路的设计,介绍了采用二相无交叠功率时钟的互补传输门绝热逻辑（CPAL）电路,并分析了其工作原理．该电路利用nMOS管自举原理对负载进行全绝热驱动,从而减小了电路整体功耗,且CPAL能耗几乎与工作频率无关．提出了性能良好的低功耗绝热D、T和JK触发器,并与其他几种绝热触发器进行功耗比较．给出了绝热时序电路的一般设计方法,并作为实例采用应用绝热D触发器设计了十进制计数器．SPICE程序模拟表明：设计的电路具有正确的逻辑功能及低功耗的优点．     

微带型回音壁模介质谐振器带阻方向滤波器

本文报道了使用新型平面回音壁模介质谐振器的微带型毫米波带阻、方向滤波器。全文用行波环谐振器的方法进行分析,并给出了Ka波段带阻、方向滤波器的实验研究,其结果表明,该谐振器特别适用于毫米波微带集成电路。     

有限变形弹性动力学的非传统Gurtin型变分原理

根据古典阴阳互补和现代对偶互补的基本思想,通过作者早已提出的一条简单而统一的途径,系统地建立了有限变形弹性动力学的各类非传统Gurtin型变分原理.给出一个以卷积表示的重要关系式,可以认为,该式是有限变形动力学的广义虚功原理的表式.从该式出发,不仅能得到有限变形动力学的虚功原理,而且通过给出的一系列广义Legendre变换,还能系统地成对导出5类变量、3类变量、2类变量和1类变量非传统Gurtin型变分原理的互补泛函.通过这条途径还能清楚地阐明这些原理之间的内在联系.     

岩体结构非平衡演化的有效应力原理及长期稳定性分析

开挖卸荷后的天然岩体往往处于非平衡演化状态, 将直接影响岩体工程结构的正常运行、长期稳定和安全. 时效变形和损伤演化是岩体结构非平衡演化的核心. 在赖斯(Rice) 内变量热力学理论框架下, 提出了岩体结构非平衡演化的有效应力原理, 指出有效应力是总应力中能有效驱动结构演化的部分. 将内变量率形式的非弹性应变率方程和能量耗散率函数表示为有效应力形式, 并提出非弹性余能概念. 给定具体的余能密度函数和内变量演化方程, 得到了考虑损伤的内变量黏塑性应变率方程. 通过相似材料加卸载蠕变试验结果进行参数辨识, 并分别计算了内变量率形式和有效应力形式的黏塑性应变率、能量耗散率和非弹性余能, 并对其进行比较分析. 结果表明:在过渡蠕变和稳态蠕变阶段两种形式的方程计算的黏塑性应变率几乎相等, 但在加速蠕变阶段两者相差较大;非弹性余能和能量耗散率全域积分分别从驱动结构非平衡演化的内在潜力和实际效果的角度表征了结构的非平衡演化状态和演化趋势, 能量耗散率积分更合适用于评价岩体工程结构的长期稳定性. 最后以深埋地下洞室作为工程算例, 并对其长期稳定性进行分析.      

腔内扰动对虚共焦腔模式的影响及Zernike像差拟合

为实现高功率或高能激光器输出良好的光束质量和能量,分析了腔内像差扰动对非稳腔模式的影响,采用数值迭代法理论计算了腔内倾斜扰动对无源虚共焦非稳腔输出模式强度和相位分布的影响,并采用Zernike模式法对光束相位进行了像差拟合分解,得到了前35阶像差系数,通过进一步计算得到点扩散函数和环围能量曲线等,从而全面了解输出光束质量.结果表明,对小菲涅耳数虚共焦型非稳腔,腔内倾斜扰动不仅带来输出光强分布的不均匀性,且对相位分布有明显的影响,使相位中的一些高阶Zernike像差如A3,A7和A10等增大.计算结果对研究高能激光器腔内像差校正有一定参考意义.     

Nonlinear optics in spheres: from second harmonic scattering to quasi‐phase matched generation in whispering gallery modes

Over the last fifteen years, a series of theoretical and experimental investigations have demonstrated the usefulness of circular geometries to tailor second‐order nonlinear optical effects. However, until recently, such effects have remained rather weak, calling for their enhancement. In parallel, developments in the field of high quality factor spherical or ring resonators have shown that many different types of light‐matter interactions can be dramatically amplified when light is coupled in the whispering gallery modes of such resonators. In high‐quality spherical micro‐resonators, close to one million interactions can occur between a nonlinear molecule and a circulating light pulse. Recent research on nonlinear optics in spherical geometry is reviewed, from micrometer‐size spheres to whispering gallery mode resonators.     

Gauss Optics and Gauss Sum on an Optical Phenomena

In the previous article (Found. Phys. Lett. 16:325–341, 2003), we showed that a reciprocity of the Gauss sums is connected with the wave and particle complementary. In this article, we revise the previous investigation by considering a relation between the Gauss optics and the Gauss sum based upon the recent studies of the Weil representation for a finite group.     

因子von Neumann代数上导子的等价刻画

设R是含非平凡幂等元P的素环,C∈R,C=PC.本文证明可加映射△:R→R在C可导,即△(AB)=△(A)B+A△(B),A,B∈R,AB=C当且仅当存在导子δ:R→R,使得△(A)=δ(A)+△(I)A,A∈R.没有I_1型中心直和项的von Neumann代数上的可导映射也有类似结论.利用该结论证明了,若非零算子C∈B(X),使得ran(C)或ker(C)在X中可补,则可加映射△:B(X)→B(X)在C可导当且仅当它是导子.特别地,证明了因子von Neumann代数上的可加映射在任意但固定的非零算子可导当且仅当它是导子.