REPORT ON ELECTROMAGNETIC METROLOGY IN CHINA DURING 1990-1992

ＲＥＰＯＲＴＯＮＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＭＥＴＲＯＬＯＧＹＩＮＣＨＩＮＡＤＵＲＩＮＧ１９９０－１９９２￥ＹａｎｇＸｉａｏｒｅｎ；ＲｅｎＤｉａｎｑｉｎｇ；ＬｉＺｉｚｈｏｎｇ（ＣｏｍｍｉｓｓｉｏｎＡ，ＣｏｍｍｉｔｔｅｅｆｏｒＣｈｉｎｅｓｅＵＲＳＩ）...     

文摘

文摘１３，５－二硝基苯甲酸与３，５－二硝基苯甲酸铝盐的分解热研究（英文）Ｃ９２３３１９０３ＲＥＤＤＹＧＯ，ＲＡＶＩＫＵＭＡＲＫＳ（ＩＤＬＣｈｅｍｉｃａｌｓＬｔｄ，Ｂａｎｇａｌｏｒｅ，ＩＮＤ）：Ｅ０３５０ＣＴｈｅｒｍｏｃｈｉｍＡｃｔａ（ＮＬＤ）１９８（...     

HMW—HDPE与LMW—HDPE的共混改性

选用一种高分子量高密度聚乙烯（ＨＭＷ－ＨＤＰＥ）和一种低分子量高密度聚乙烯（ＬＭＷ－ＨＤＰＥ），对它们的共混行为和共混物的热性能、流动性能和力学性能进行了研究。结果表明，在研究的共混比范围内，由ＤＳＣ发现双组分体系可能存在共晶相。ＨＭＷ－ＨＤＰＥ／ＬＭＷ－＝ＨＤＰＥ共混体系的熔体指数基本符合Ａｒｒｈｅｎｉｕｓ粘度加和方程：ＭＩ＝ＭＩ．ＭＩ２。在ＬＭＷ－ＨＤＰＥ质量百分含量为２０％时，共混体系的拉伸     

天龙’99款CD机

日本天龙生产的中、高档ＣＤＭＬ有很高的知名度,今年推出的ＤＣＤ－Ｓ１０ｍ型ＣＤ机,是目前国内市场天龙ＣＤ机的最新机型,其特点是：（１）采用天龙公司特有的ＡＬ２４技术,心脏部分的ＤＡＣ为２４ｂｉｔ的多ｂｉｔ形Ｄ／Ａ变换器。（２）装有ＨＤＣＤ解码器,数码滤波器为８ｆｓ,ＬＰＦ采用ＧＩＣ３次模拟滤波器。（３）机座采用高档机型ＳＩ所采用的铸造底盘,双层顶盖,３层底板,转盘采用Ｓ·Ｖ·Ｈ方式。ＤＣＤ－Ｓ１０Ⅲ是ＤＣＤ－Ｓ１０Ⅱ的改进型,该型机的ＤＡ变换器可适用于９６ｋＨｚ／２４ｂｉｔ的格式工作。该机在中国…     

A Modification of SOM Network(SLFM) and Its Applications in Tool Wear Monitoring and Quality Control

ＡＭｏｄｉｆｉｃａｔｉｏｎｏｆＳＯＭＮｅｔｗｏｒｋ（ＳＬＦＭ）ａｎｄＩｔｓＡｐｐｌｉｃａｔｉｏｎｓｉｎＴｏｏｌＷｅａｒＭｏｎｉｔｏｒｉｎｇａｎｄＱｕａｌｉｔｙＣｏｎｔｒｏｌ★ＺｈｕＭｉｎｇｑｕａｎＣａｉＹｏｎｇｘｉａＤｅｐａｒｔｍｅｎｔｏｆＡｅｒｏｎ...     

共聚物电解质MA—Na2／AA—Na水溶液的粘度特性

对共聚物电解质ＭＡ－Ｎａ２（顺丁烯二酸钠）／ＡＡ－Ｎａ（丙烯酸钠）水溶液ηｓｐ／Ｃ（比浓粘度）与浓度的关系、中性盐及溶液ｐＨ对ηｓｐ／Ｃ的影响进行了研究。结果表明，稀释ＭＡ－Ｎａ２／ＡＡ－Ｎａ溶液时，ηｓｐ／Ｃ急剧上升，而稀释含中性盐（ＫＣｌ或ＣａＣｌ２）的ＭＡ－Ｎａ２／ＡＡ－Ｎａ溶液体系时（中性盐含量保持０．０１ｍｏｌ／Ｌ），ηｓｐ／Ｃ的变化却不大。添加极少量（〈０．０５％）中性盐，可使ＭＡ－Ｎ     

MOCVD热力学分析软件的开发

报导了最新开发的ＭＯＣＶＤ热力学分析软件－ＭＯＣＶＤＴＡ，它是一个采用目前比较 ＶＣＳ算法对ＭＯＣＶＤ的稳态系统进行单参数及双参数分析的软件。介绍了其功能，特点，使用方法以及适用条件，并且以Ａｓ－Ｈ系统及Ｇａ－Ａｓ－Ｃ－Ｈ系统为例进行了模拟，得到了很好的模拟结果。     

LOM技术中的挤制陶瓷片的研究

采用挤出工艺制备了用于ＬＯＭ技术中的Ａｌ２Ｏ３和ＳｉＣ陶瓷片坯件，厚度０．２ｍｍ。有机物载体采用低密聚乙烯，固体粉料占４８ｖｏｌ％，研究了Ａｌ２Ｏ３－ＬＤＰＥ混合物的流变性能，对陶瘊片进行了ＴＧ－ＤＴＡ热分析和ＳＥＭ微观组织分析。     

SIGMA—DELTADAC板的设计技术

介绍了一种新型的ＤＡＣ板──ＳＩＧＭＡ－ＤＥＬＴＡ ＤＡＣ的设计技术,给出了ＤＡＣ板的设计原理框图,详细叙述了ＳＩＧＭＡ－ＤＥＬＴＡ ＤＡＣ的硬件设计及软件调试结果。     

DMF中电沉积制备Yb-Co合金膜

研究了于室温下含有少量水的ＹｂＣｌ３－ＣｏＣｌ２－ＤＭＦ溶液中电沉积制备Ｙｂ－Ｃｏ合金膜。ＥＤＡＸ和ＸＲＤ分析表面：在０．１０ｍｏｌ／Ｌ ＹｂＣｌ３－０．１０ｍｏｌ／Ｌ ＣｏＣｌ２的ＤＭＦ电镀液中,以控制电位为－２．７５Ｖ（ＳＣＥ）进行恒电位电解,以控制电流密度为１００Ａ／ｍ＾２进行恒电流电解或以控制脉冲电流密度为１５０Ａ／ｍ＾２进行脉冲电解,可以得到不同形态和Ｙｂ含量的共沉积合金膜,且膜层光滑、     

彩色PDP中的重复行技术及其实现

对于采用ADS技术的彩色PDP ,增加子场数目能够有效地消除动态假轮廓的影响 ,但增加子场数目将使寻址时间增大、维持发光时间减少 ,从而使彩色PDP的亮度降低。采用重复行技术能够有效缓解寻址时间与维持时间之间的矛盾 ,在寻址时间不变的情况下增加子场数目 ,本文详细分析了一种实用的重复行技术及其最小误差算法     

模糊寻址自动跟踪彩色套印控制系统

针对某些塑料薄膜凹版彩色印刷机的特点,研制了模糊寻址自动跟踪彩色套印控制装置.解决了整机单薄引起的振动、版辊相对滑动引起的地址偏移和压辊长度不够引起的边沿褶皱对检测信号的影响.软件算法上,采用模糊寻址、自动跟踪方式,避免了利用波门精确寻址需要的显示设备,降低了对设备改造的成本.     

Digital halftoning: A model-based perspective

Model-based halftoning techniques exploit the properties of the display device and the human visual system to maximize the quality of the displayed images. They rely on accurate models of the display and human perception. The focus of this article is on printers (both black and white and color) but similar techniques can be applied to other display devices. We review two model-based techniques, the modified error diffusion algorithms and the least-squares model-based algorithm. Both algorithms produce images with high spatial resolution and visually pleasant textures. We also review the use of printer and eye models in blue-noise screening techniques, which attempt to approximate the performance of error diffusion with minimal computation. We examine the performance of these halftoning techniques using both model-based quality metrics and subjective evaluations. © 1996 John Wiley & Sons, Inc.     

PDP单元寻址期放电特性的研究

本文基于帕邢定律,采用数值模拟的方法,计算了放电单元内,沿不同放电路径着火电压的分布情况.结合流体模型,研究了寻址期ACCPDP中X电极偏压,对寻址放电以及壁电荷积累的影响.模拟结果表明,寻址期间,在ACCPDP的X电极加一定的正偏压(VX),能达到较好的壁电荷积累,从而降低维持期工作电压.在理论计算的基础上,本文基于气体放电相似性定律,设计和制作了ACCPDP放大单元.拍摄了ACCPDP寻址放电过程,并研究了不同VX偏压对于寻址放电影响.实验得到的放电过程中光发射分布,也间接证明了模拟结果的正确性.     

Deterministic addressing of nanoscale devices assembled at sublithographic pitches

Multiple techniques have now been proposed using random addressing to build demultiplexers which interface between the large pitch of lithographically patterned features and the smaller pitch of self-assembled sublithographic nanowires. At the same time, the relatively high defect rates expected for molecular-sized devices and wires dictate that we design architectures with spare components so we can map around defective elements. To accommodate and mask both of these effects, we introduce a programmable addressing scheme which can be used to provide deterministic addresses for decoders built with random nanoscale addressing and potentially defective wires. We describe how this programmable addressing scheme can be implemented with emerging, nanoscale building blocks and show how to build deterministically addressable memory banks. We characterize the area required for this programmable addressing scheme. For 2048/spl times/2048 memory banks, the area overhead for address correction is less than 33%, delivering net memory densities around 10/sup 11/ b/cm/sup 2/.     

Digital ultrasonic image construction using electronic ordered dither techniques

The use of a digital microprocessor based system for the acquisition of ultrasonic C-scan information is investigated. The C-scan information is displayed on a binary display device using electronic ordered dither techniques to represent gray levels. The digital system with a binary display increases system flexibility and yields better reproducibility and constant image quality independent of the display medium. Images may be stored on magnetic tape or disk for later retrieval and image processing. The techniques which are described allow for image magnification and a reduction in scan time by replacing the mechanical linkage between the scanner and the display with digital signals. A detailed comparison is made between two dither signals, and the advantages of each are discussed. The combination of digital signal processing and imaging techniques produces results which utilize the capabilities of ultrasonic inspection to the point where the transducer becomes the limiting factor.     

水下被动定位声纳显示及航迹跟踪方法

根据水下目标定位跟踪的系统功能,设计了用于水下目标被动定位跟踪的综合显示系统,能够实现信号的特征显示、轨迹跟踪处理和目标轨迹识别。采用B式瀑布图显示技术、目标航迹跟踪技术以及基于Hough变换的航迹信息提取技术,仿真分析和实验数据表明,该显示系统的设计可以提高被动定位跟踪综合显示性能。     

Evolutionary algorithms for solving the automatic cell planning problem: a survey

Automatic cell planning (ACP) is an optimization problem from the mobile telecommunications domain that addresses finding the location of the network antennae as well as their parameter settings in order to satisfy several cellular operator requirements. Due to its NP-hard complexity, evolutionary techniques have become popular for solving ACP instances. This article presents a survey of evolutionary algorithms (EAs) engineered for addressing ACP problems, analysing both the features of the considered ACP problem and the main aspects of the EAs used to solve them. The survey provides an up-to-date overview that is not limited to any particular kind of evolutionary approach, and comprises advanced algorithmic enhancements like hybridization and parallelization. The article ends by addressing some important issues and open questions that can be the subject of future research.     

Nanoscale solid-state quantum computing

Most experts agree that it is too early to say how quantum computers will eventually be built, and several nanoscale solid-state schemes are being implemented in a range of materials. Nanofabricated quantum dots can be made in designer configurations, with established technology for controlling interactions and for reading out results. Epitaxial quantum dots can be grown in vertical arrays in semiconductors, and ultrafast optical techniques are available for controlling and measuring their excitations. Single-walled carbon nanotubes can be used for molecular self-assembly of endohedral fullerenes, which can embody quantum information in the electron spin. The challenges of individual addressing in such tiny structures could rapidly become intractable with increasing numbers of qubits, but these schemes are amenable to global addressing methods for computation.     

ATE and Avionics Display Systems

Sophisticated avionics display systems are rapidly replacing the multitude of indicating panel meters and CRT displays of the past. With this sophistication of avionics display systems necessarily comes the sophistication of display testing techniques. This paper addresses the types of systems to be tested in addition to past and present testing methods. A projection of future display testing requirements concludes the paper.