桩基静载试验的实践与认识

本文以长期桩基静载试验的实践经验，进一步阐述了静载试验对桩基理论、设计和施工发展的重要性，强调了静载试验的客观科学要求，并对产生桩基质量问题的主要原因作了简要的分析和探讨．     

静电感应器件栅源击穿特性的改善

对静电感应器件的栅源击穿特性做了实验研究,结果表明,当使用高阻单晶材料作为芯片的衬底和沟道,沟道的半宽度小于零栅压耗尽层宽度且源区外延层掺杂深度较高时,器件的击民ｇｓ０基本上局限在１０Ｖ以下,与外延层的厚度没有明显关系,作者指出静电感应器件栅 源击穿的特点是由于沟道宽度较窄和源区道区掺杂浓度差异较大两方面的因素共同的。在这种情况下,栅源击穿电压ＢＶｇｚ０与半导体的击穿电场Ｅｂ和沟道宽度Ｗ的关系可表     

The determination of volume ratios by gas depletion through multiple expansions

We present a new technique for the determination of the volume ratio of two vacuum chambers connected through a valve. The method is based on the measurement of the pressure in a chamber filled with a gas that is repeatedly depleted by expansion in a second chamber that was previously evacuated. Our calculation shows that under the reported measurement conditions, this technique has an uncertainty comparable to that obtained from the gas accumulation technique [Elliott KWT, Clapham PB.The accurate measurement of the volume ratios of vacuum vessels. NPL Report MOM 28, January 1978]. An excellent equivalence between the results obtained with this new technique and the measurements obtained by the gas accumulation technique is demonstrated.     

<Emphasis Type="Bold">Development of Divisional Parallel Scan Technology in Large-Scale Laminated Object Manufacturing</Emphasis>

Many technological difficulties exist in the field of rapid prototyping (RP) technology when making large-scale prototypes. The manufacturing efficiency is the main problem, and the process implemention and RP equipment also present difficulties. In this paper, the concept of divisional parallel scan is presented. Laminated object manufacturing (LOM) technology is used for the basic forming process and has been improved continuously through practice. Static divisional scan technology was also better developed to dynamic divisional scan technology, which can help in achieving the object of improving work efficiency and optimising design.     

Duality for nondifferentiable static multiobjective variational problems involving generalized (F, ?)-Convex functions

Using the generalized Schwarz inequality, we establish some weak duality theorems for nondifferentiable static multiobjective variational problems involving generalized (F, )-convex functions. Later in the sequel, we introduce three dual models for the nondifferentiable static multiobjective fractional variational problems and derive weak duality results for such programs.     

Feedback linearization control of the looper system in hot strip mills

This paper studies on the linearization of a looper system in hot strip mills, that plays an important role in regulating a strip tension or a strip width. Nonlinear dynamic equations of the looper system are analytically linearized by a static feedback linearization algorithm with a compensator. The proposed linear model of the looper is validated by a comparison with a linear model using Taylor’ s series. It is shown that the linear model by static feedback well describes nonlinearities of the looper system than one using Taylor’ s series. Furthermore, it is shown from the design of an ILQ controller that the linear model by static feedback is very useful in designing a linear controller of the looper system.     

静态弯曲法测定弹性模量—介绍一种简易测弹模的装置和方法

本工作根据材料力学弹性变形原理,采用悬壁静态弯曲法,设计制作一种轻便测试有色金属弹性模量的装置。     

全文检索系统中动态索引技术的研究

全文检索是一种非常有效的信息检索技术，本文通过分析全文检索系统中静态索引技术的优缺点，以及影响动态性能的因素，提出一种基于互关联后继树模型的动态索引技术，该技术在不影响查询效率等性能的情况下，很好地解决了索引的更新问题，提高了索引的动态性能。     

多核处理器降低功耗技术综述

随着芯片集成度越来越高，处理器功耗已经和性能、时钟频率、芯片尺寸共同成为衡量一个处理器优劣的最主要标准。传统的降低功耗的技术都是针对功耗本身，即动态消耗和静态消耗，针对动态消耗的有多元供能电压技术（Multiple Supply Voltage）、动态电压调节技术（Dynamic Voltage Scaling）和基于时钟信号的技术，针对静态消耗的有通道长度调整技术（Channel Length Scaling）、寄存器锁存技术和能量选通技术（Power Gating）。近两年从处理器结构和算法角度思考降低功耗逐渐成为热点，在未来一段时间将成为研究的主要方向。     

基于JPEG2000的静态医学图像压缩设计方案

针对静态医学图像压缩，介绍了两种压缩标准JPEG与JPEG2000，通过对它们的比较，突出JPEG2000的优势，诠释了JPEG2000的基本结构与编码、解码技术，描述了基于DSP的图像压缩设计方案。系统采用CCD采集数字图像，用16位定点DSP进行小波压缩，主要为了减小传输费用，试验结果表明JPEG2000对图像重现与压缩比率效果较优。