冷连轧机的动态变规格过程的计算机仿真

针对某厂的5机架冷连轧机的动态变规格过程进行仿真研究.首先建立其动态变规格时的仿真系统,分析了其动态变规格过程的实现方案.然后在此基础上对其变规格过程进行了仿真分析,指出了现在方案中的问题,提出了一种改进方案,并通过进一步的仿真说明了改进方案的可行性和有效性.     

严寒环境下排水管线施工方法

严寒环境下排水管道施工问题一直是困扰施工单位和建设单位的一大难题。作者在长期的施工和设计工作中,总结出以下严寒环境下排水管线施工方法,即管道的防腐、焊接、检查井井盖等重点施工项目集中保护处理;管沟开挖、回填及管道闭水试验快速处理;检查井及检查井进出水管制作及连接特殊处理的方法,从而保证整个工程施工质量合格,并且节省工程费用,保障施工单位和建设单位的经济利益不受损失。     

From defects creation to circuit reliability - A bottom-up approach (invited)

This paper presents a theoretical framework about interface states creation rate from Si-H bonds at the Si/SiO₂ interface. It includes three mains ways of bond breaking. In the first case, the bond can be broken thanks to the bond ground state rising with an electrical field. In the two others cases, incident carriers will play the main role either if there are very energetic or very numerous but less energetic. This concept allows us physically modeling the reliability of MOSFET transistors, and particularly NBTI permanent part, and Channel Hot Carrier (CHC) to Cold Carrier (CCC) damage. Finally, the translation of these physical models into reliability spice models is discussed. These models pave the way to Design-in Reliability (DiR) approach which seeks to provide a quantitative assessment of reliability - CMOS device reliability in this case - at design stage thereby enabling judicious margins to be taken beforehand.     

检定S型短型热电偶的4种不同冷端补偿方法之比较

检定长度在200～700 mm范围内的S型热电偶时,由于参考端温度大都处于室温或者波动的温场之中,需要将参考端温度恒定在0℃或采取修正、补偿等措施进行修正。现采取检定中最常用的4种不同的冷端补偿方法检定同一支S型短型热电偶,对结果进行比较分析,得到这4种不同的冷端补偿方法的优劣性及其准确度排序。结果表明,将参考端应用达到一等标准热电偶准确度水平的同极性热电偶丝延伸至参考端恒温器方法能获得较为理想的补偿效果。     

Effect of heat treatment on mechanical properties of heavily cold-rolled Fe-6.5wt%Si alloy sheet

Fe-6.5wt%Si alloy has excellent soft magnetic properties,but it is hard to be cold-rolled due to appearance of ordered phases in this alloy.In this paper we report that ultra thin Fe-6.5wt%Si sheet of 0.05 mm thick was obtained by heavily cold rolling.By means of optical microscope,micro-hardness indenter,instron,SEM and X-ray diffraction,the effect of heat treatment on mechanical properties of this alloy sheet was investigated.The heavily cold-rolled sheet exhibits some extent of ductility.The ultimate ten...     

A universal roll‐to‐roll slot‐die coating approach towards high‐efficiency organic photovoltaics

This work develops a combinational use of solvent additive and in‐line drying oven on the flexible organic photovoltaics to improve large‐area roll‐to‐roll (R2R) slot‐die coating process. Herein, addition of 1,8‐diiodooctane (DIO) in the photoactive layer is conducted to yield a performance of 3.05% based on the blending of poly(3‐hexylthiophene) (P3HT) and [6,6]‐phenyl C₆₁‐butyric acid methyl ester (PC₆₁BM), and a very promising device performance of 7.32% based on the blending of poly[[4,8‐bis[(2‐ethylhexyl)oxy] benzo[1,2‐b:4,5‐b’] dithiophene‐2,6‐diyl] [3‐fluoro‐2‐[(2‐ethylhexyl)carbonyl]thieno[3,4‐b]thiophenediyl]] (PTB7) and [6,6]‐phenyl C₇₁‐butyric acid methyl ester (PC₇₁BM). Based on this R2R slot‐die coating approach for various polymers, we demonstrate the high‐performance result with respect to the up‐scaling from small high‐PCE cell to large‐area module. This present study provides a route for fabricating a low‐cost, large‐area, and environmental‐friendly flexible organic photovoltaics.     

机载相控阵雷达阵面电源的热设计

在某型机载相控阵雷达中，阵面电源采用移相控制零电压软开关PWM变换技术，既能实现功率管的零电压开关，又能实现功率管的恒定频率控制，符合电力电子技术的发展方向。该电源功率大，功率密度高，与传统小功率机载电源相比，总功耗增加，热设计更复杂。文中介绍了该电源的热设计过程，并着重对冷板和高功率变压器的热设计进行了深入的探讨。     

冷原子束或超冷原子束的产生及其应用

综述了冷原子束或超冷原子束产生的基本原理、方法和实验结果及其最新进展.重点介绍了建立在激光冷却(多普勒、亚多普勒和亚反冲冷却机制)和磁光阱技术基础上的冷原子束或超冷原子束产生方案,并简单介绍了冷原子束或超冷原子束在基础物理问题研究和原子光学等领域中的应用.     

多孔硅表面冷电子发射的研究

本文研究了多孔硅二极管表面发射电子的特性。ＰＳ二极管由薄金膜、ＰＳ层、ｎ型Ｓｉ衬底和欧姆接触铝背电极组成。在真空中,当在金属电极和铝背电极间加适当高的正电压且在收集极板和金电极间存在高外电场时,伴随着可见光,电子均匀地穿过金膜出来。电子发射的机理基于ＰＳ层外表面附近的强场效应。     

莱钢热连轧中粗轧控制系统的研究

粗轧控制系统主要由电动压下、液压AGC、液压APC组合而成。电动压下用于长行程辊缝调节,液压AGC用于辊缝微调和轧制过程中的厚度控制,液压APC用于位置闭环和压力闭环的调节。