Traveling wave method for calculation of linewidth, frequencytuning, and stability of semiconductor lasers

The authors present a new traveling wave method for calculating the linewidth, the frequency tuning efficiency, and a mode stability parameter for a general class of laser-diode structures. The method leads to simple semianalytic expressions which allow an easy numerical determination of the three parameters     

基于最小能量原理的SMT焊点三维形态预测

本文应用最小能量原理和有限元方法建立表面组装技术（ＳＭＴ：Ｓｕｒｆａｃｅ Ｍｏｕｎｔ Ｔｅｃｈｎｏｌｏｇｙ）形成的焊点三维形态预测模型,并运用该模型对塑料球栅阵列（ＰＢＧＡ：Ｐｌａｓｔｉｃ Ｂａｌｌ Ｇｒｉｄ Ａｒｒａｙ）器件焊点三维形态问题进行了预测和分析。最后将预测结果与试验结果以及国外学者用数学分析模型所得的预测结果进行了对比验证。     

Phenoxazine-based organic dyes with different chromophores for dye-sensitized solar cells

A series of organic dyes (POZ-2, POZ-3, POZ-4 and POZ-5) involving phenoxazine were synthesized as sensitizers for application in dye-sensitized solar cells (DSSCs). For comparison, three different electron donors namely 10-phenyl-10H-phe-nothiazine, 10-phenyl-10H-phenoxazine and triphenylamine were separately appended onto the 7-position of the model dye (POZ-2). The obtained four dyes exhibit considerably high values of conversion efficiencies of 6.6%, 7.8%, 7.1% and 6.4%, respectively, under the simulated AM1.5G conditions. The geometries of the dyes were optimized to gain insight into the molecular structure and electron distribution, and then the charge extraction and transient photovoltage decay measurements were further performed to understand the influence of electron donors on the photovoltaic behaviors.     

Enhanced Performance of a ZnO Nanowire‐Based Self‐Powered Glucose Sensor by Piezotronic Effect

A self‐powered, piezotronic effect‐enhanced glucose sensor based on metal‐semiconductor‐metal (M–S–M) structured single ZnO nanowire device is demonstrated. A triboelectrical nanogenerator (TENG) is integrated to build a self‐powered glucose monitoring system (GMS) to realize the continuously monitoring of glucose concentrations. The performance of the glucose sensor is generally enhanced by the piezotronic effect when applying a –0.79% compressive strain on the device, and magnitude of the output signal is increased by more than 200%; the sensing resolution and sensitivity of sensors are improved by more than 200% and 300%, respectively. A theoretical model using energy band diagram is proposed to explain the observed results. This work demonstrates a promising approach to raise the sensitivity, improve the sensing resolution, and generally enhance the performance of glucose sensors, also providing a possible way to build up a self‐powered GMS.     

透明液晶薄膜旋光色散特性研究

以透明塑料为基板,将液晶薄膜均匀涂于其上制成透明的具有旋光性的薄片,并用自行研制的旋光色散装置,对所制薄片的旋光色散特性进行了研究,测试结果显示其具有很大的旋光性.同时,用玻尔兹曼方程进行了理论拟合,发现拟合结果与实验结果有着极好的符合。     

基于光电法的淤泥密度探测仪的设计

本探测仪的原理是介质中的光吸收量和它的密度成比例.光源发出的光在介质中传播后被光电传感器接收,光电传感器将光信号转换成电信号,信号放大后输出,单片机将模拟信号转换成数字信号经RS485接口传送至计算机,计算机处理后显示出水下淤泥密度的分布情况,起到指导清淤人员工作的作用.     

机载合成孔径激光雷达关键技术和实现方案分析

该文介绍了机载合成孔径激光雷达的研究现状,分析了国内研究工作的主要问题和系统关键技术,并结合原理样机实例,提出了合成孔径微波SAR 电子学技术和光学技术相结合的系统实现方案,同时分析了未来实用系统指标和技术途径,论述了机载合成孔径激光雷达的应用方向。      

省级安播监管系统设计与实现

在广电总局和省局指示精神的指导下,江苏有线三网融合枢纽中心建成了省中心集中汇聚,分中心独立管控的三级安播监管体系.本文从建设目标,网络结构,系统组成等方面介绍了江苏有线安播监管系统,提出了"播监控三维一体","省市县三位一体"的省级全覆盖式安播监管体系解决方案.     

Highly Stable and Active Flexible Electrocatalysts Derived from Lotus Fibers

The stability and activity of electrocatalysts are fundamental in energy-related applications (e.g., hydrogen generation and energy storage). Electrocatalysts degrade over time when the active centers are not strongly anchored to the support. However, if the active centers are too strongly anchored, the activity of the electrocatalysts decreases due to reduced accessibility to reactants. Herein, a strategy is presented to balance the stability and activity of different active materials using a natural and flexible support material that can be woven and carbonized. Lotus fibers, which have surface hydroxyl and phenolic groups, high mechanical strength, and a mesoscale porosity post-pyrolysis, are used to load diverse functional metal-containing materials such as metal–organic frameworks, 2D materials, metal sulfide nanoparticles, metal ions, and high-entropy alloys. After pyrolysis, the electrocatalysts display flexibility, high catalytic performance, and long-term stability, outperforming commercial benchmarks (e.g., Pt/C) in specific scenarios for water splitting, liquid batteries, and flexible electronics.     

高频阶梯槽的制作研究

随着电子产品往高频、高速、小型化的发展趋势,高频阶梯槽的设计需求日益旺盛,本文基于高频阶梯槽在常规加工工艺所产生的偏位、流胶、板材损伤问题的突破,对高频阶梯槽的设计可实现性进行研究。