A new technique for boosting efficiency of silicon solar cells

A new type of photovoltaic system with higher generation power density has been studied in detail. The feature of the system is a V-shaped module (VSM) with two tilted monocrystalline solar cells. Compared to solar cells in a flat orientation, the VSM enhances external quantum efficiency and leads to an increase of 31% in power conversion efficiency. Due to the VSM technique, short-circuit current density was raised from 24.94 to 33.7 mA/cm², but both fill factor and open-circuit voltage were approximately unchanged. For the VSM similar results (about 30% increase) were obtained for solar cells fabricated by using mono-crystalline silicon wafers with only conventional background impurities.     

在用烘缸与非标准烘缸材料拉伸强度的评定

本文通过试验分析研究，提出了用计算材料共晶度及测量布氏硬度的方法，评定造纸机的在用烘缸与非标准烘缸拉伸强度，为检定这种类型的烘缸，提供了可供使用的经验公式。     

长江马鞍山河段河势控制及应急工程分析

 本文研究了长江马鞍山分汊河段河床演变的基本规律；分析了小黄洲汊道：上游段水流动力轴线的典型位置、转化周期及其对汉道演变的影响；总结了对该分汊河段进行河势控制的必要性和基本方法；提出了对该河段进行河势控制应急工程的方案设想。     

在发电厂建设中采用基金会现场总线技术

本文概述了国内外电厂中应用FF现场总线技术的近况,介绍了专家对发电厂建设中采用现场总线技术的应用研究报告.     

Preliminary design and analysis of a cubic deployable support structure based on shape memory polymer composite

The deployable structures based on shape memory polymer composites (SMPCs) have been developed for its unique properties, such as high reliability, low-cost, lightweight, and self-deployment without complex mechanical devices compared with traditional deployable structures. In order to increase the inflatable structure system’s robustness and light the weight of it, a cubic deployable support structure based on SMPC is designed and analyzed preliminarily. The cubic deployable support structure based on SMPC consists of four dependent spatial cages, each spatial cage is composed of 12 three-longeron SMPC truss booms and end connections. The shape recovery of arc-shaped deployable laminates drive the three-longeron SMPC truss booms to unfold, thus realize the expansion of the deployable support structure. The concept and operation of the cubic deployable support structure are described in detail. A series of experiments are performed on the three-longeron deployable laminates unit and the simplified cubic deployable support structure to investigate the shape recovery behavior in the deployment process. Results indicate that the cubic deployable support structure has a high deployment-tgo-stowage volume ratio and can achieve self-deployment, package, and deploy without complex mechanical devices.     

Enhanced mechanical,thermal and dielectric properties of polyimide nanocomposites containing SiCp (SiCw) nanofillers for high energy-storage applications

Journal of Polymer Research - In this paper, we aimed to develop the nanocarrier based on poly (N-isopropyl acrylamide)—allyl acetoacetate grafted MoS2 nanosheets. The obtained polymer...     

系统设计中如何节省转发器带宽的占用

本文根据村通工程中的实际情况,提出了3种节省转发器带宽的方法,并提出了不同技术适用的条件和需要注意的问题.     

高校计算机一级考试评分系统的实现

讨论了用Visual Basic.net和SQL Server 2000实现高校计算机一级考试评分系统,阐述了考试评分系统的功能、结构及其应用情况.     

基于粗糙集理论的图像增强方法

粗糙集理论是一种新的处理含糊的不确定性问题的数学工具。本文提出一种基于粗糙集的图像增强新方法,该方法按条件属性,将一幅图像划分为不同的子图,然后对子图分别作对比度增强,增强图像的效果较为理想,满足了工程上的要求。