快速辐射度算法的实现研究

当虚拟场景发生变化时,扩展的逐步求精算法作为一种快速的辐射度算法,大量减少了重新计算辐射度所花费的时间。对扩展的逐步求精算法进行研究,并利用OpenGL对算法进行了实现。通过在实验中对虚拟场景的表面反射率和几何属性进行改变,获得了一些证明算法有效性的数据,从而验证了该算法的有效性。     

Pseudohalide‐Induced Recrystallization Engineering for CH3NH3PbI3 Film and Its Application in Highly Efficient Inverted Planar Heterojunction Perovskite Solar Cells

High crystallinity and compactness of the active layer is essential for metal‐halide perovskite solar cells. Here, a simple pseudohalide‐induced film retreatment technology is developed as the passivation for preformed perovskite film. It is found that the retreatment process yields a controllable decomposition‐to‐recrystallization evolution of the perovskite film. Corresponding, it remarkably enlarges the grain size of the film in all directions, as well as improving the crystallinity and hindering the trap density. Meanwhile, owing to an intermediate catalytic effect of the pseudohalide compound (NH₄SCN), no crystal orientation changing and no impurity introduction in the modified film. By integrating the modified perovskite film into the planar heterojunction solar cells, a champion power conversion efficiency of 19.44% with a stabilized output efficiency of 19.02% under 1 sun illumination is obtained, exhibiting a negligible current density–voltage hysteresis. Moreover, such a facile and low‐temperature film retreatment approach guarantees the application in flexible devices, showing a best power conversion efficiency of 17.04%.     

系列程控真空计

本文概述了近几年迅速发展的由单片机控制的真空计的结构原理以及它的功能。     

Investigation of semiconductor optical amplifier integrated with DBR laser for high saturation power and fast gain dynamics

A detailed theoretical investigation of an integration of a semiconductor optical amplifier (SOA) and distributed Bragg reflector (DBR) laser is presented. The dependence of the device performance on those key design parameters such as the lasing wavelength, light injection direction (co- and contra-propagation), lasing power of the DBR laser, and the biasing condition of the SOA is examined systematically by means of a comprehensive time-domain traveling-wave model. As this integrated structure is particularly designed for high saturation power and fast gain dynamics, these characteristics are simulated and compared with the results from the conventional structures. Depending on different requirements, superior performance on either saturation power or noise figure without compromise on the optical gain can be achieved by different integration configurations (i.e., by different light injection directions). For the structure with the light injection from the output end of the SOA (namely, the integrated SOA-laser structure), the fast gain dynamics is found through simulation, which helps to reduce the large-signal waveform distortion in the amplification of narrow pulses.     

Precision fabrication techniques and analysis on high-Q evanescent-mode resonators and filters of different geometries

High-Q evanescent-mode resonators and filters are realized by both silicon micromachining and layer-by-layer polymer processing. Capacitively loaded cavities can be reduced to a size much smaller than a wavelength, but still have a much higher unloaded Q than lumped elements. The loaded resonators are utilized for reduced-size filters with a low insertion loss enabled by the relatively high-Q factor. The small fabrication tolerances of silicon micromachining and polymer stereolithography processing enable the realization of highly loaded evanescent-mode resonators and filters. A 14-GHz resonator micromachined in silicon has a volume of 5 mm /spl times/ 5 mm /spl times/ 0.45 mm, representing a resonant frequency reduction of 66.8% compared to an empty cavity of the same dimensions. The polymer-based fabrication is used to create resonators of different three-dimensional geometries with Q's up to 1940 and frequency reductions up to 49.9%. An insertion loss of 0.83 dB is measured in a 1.69% bandwidth filter created by polymer processing with a frequency reduction of 47% compared to an unloaded cavity. The frequency sensitivity to fabrication tolerances of these structures is also analyzed.     

J2EE架构下的移动智能网业务管理系统

首先对移动智能网中目前的业务管理系统的组成及各部分的功能进行了说明,并指出其缺陷,然后给出了基于J2EE(Java2PlatformEnterpriseEdition)架构下的移动智能网业务管理系统的设计和实现,并讨论了其优缺点。     

WEB Service技术在装备保障信息系统集成中的应用

针对目前我军装备保障信息系统数据集成、业务集成的现实需求,采用了面向服务的体系架构(SOA)思想,并通过WEB Service的信息系统集成实现方式,进行了WEB应用平台开发。实际应用表明,该平台重点解决装备保障系统异构问题,极大程度提高了装备保障信息化水平。     

某液晶显示器温控电路板可靠性强化试验技术研究

研究了某液晶显示器浊控电路板可靠性强化试验技术，对相关的试验过程和试验结果进行了详细的描述与分析，说明了可靠性强化试验技术在激发产品潜在缺陷、提高产品固有可靠性方面的可行性和有效性。     

A Power Efficient Test Data Compression Method for SoC using Alternating Statistical Run-Length Coding

A power efficient System-on-a-Chip test data compression method using alternating statistical run-length coding is proposed. To effectively reduce test power dissipation, the test set is firstly preprocessed by 2D reordering scheme. To further improve the compression ratio, 4 m partitioning of the runs and a smart filling of the don’t care bits provide the nice results, and alternating statistical run-length coding scheme is developed to encode the preprocessed test set. In addition, a simple decoder is obtained which consumed a little area overhead. The benchmark circuits verify the proposed power efficient coding method well. Experimental results show it obtains a high compression ratio, low scan-in test power dissipation and little extra area overhead during System-on-a-Chip scan testing.