差值法与比值法的误差修正效果比较研究及应用

差值法与比值法对不同测量系统的误差修正效果不一样.本文将两种方法的比较用一个比值来描述,并用推得的公式进行量化表示.在进一步的应用研究中,理论分析与实验数据相互印证,同时得到许多有益的结论,有助于全面掌握测量系统的误差来源,从而灵活选择各种修正方法以获得更加准确的测量结果.     

接收机测量谐波的方法及优缺点分析

本文提出了一种采用测量接收机HP8902A测量射频信号源谐波的方法,对该方法的特点及应用范围进行了分析与说明,并通过与常规的频谱分析仪测量谐波的方法进行比较,确定了该测量方法的可行性,可以用于没有频谱分析仪的情况下射频信源谐波的检定。     

三峡工程水电站压力管道和蜗壳技术结构型式的选择及论证

长江三峡水利枢纽工程建设中重大技术问题的决策是建立在大量科学试验和专家论证的基础上，三峡工程水电站压力管道和蜗壳技术结构型式的选择不仅是重大的技术经济问题，也是关系水电站长期运行问题，文章介绍了三峡工程水电站压力管道和蜗壳技术型式选择及决策。     

History of the Korean GLPs and the activities and perspectives of the Korean Society of GLP.

The Korean Society of Good Laboratory Practice (KSGLP) was established Dec. 10, 1998. The objectives of the KSGLP are to enhance the quality of domestic studies and the level of GLP compliance, in safety testing, and to promote information exchange among its members. The activities of KSGLP include: offering workshops and symposiums, linking with related governmental organizations, collecting GLP related information and providing the information to the related organizations, building international networks to collect information and to establish relationship, developing training materials and publishing periodicals, and other business necessary to achieve the objectives of the KSGLP. The KSGLP achieved its goals within a short period of time by offering workshops and symposia, and by providing important GLP related information in newspapers or via the KSGLP's internet homepage (www.ksglp.or.kr). The main role of the KSGLP will be to disseminate GLP technology nationwide. The KSGLP would like to help many labs that are preparing their facilities for GLP compliance. Further, the KSGLP is hoping to share GLP experiences with other members.     

On the Redefinition of the Second and the Velocity of Light

This summary article resulted from an informal discussion period held during the International Conference on Precision Electromagnetic Measurements, August 14-17, 1962. This session was presided over by Prof. Norman Ramsey of Harvard University. The Radio Standards Laboratory of the National Bureau of Standards in Boulder, Colorado, sponsored the meeting along with the IRE Professional Group on Instrumentation and the AIEE Instrumentation Division. Partial support for the conference came from a grant from the National Science Foundation.     

The Algebra of Geometric Impossibility: Descartes and Montucla on the Impossibility of the Duplication of the Cube and the Trisection of the Angle

Today we credit Pierre Wantzel with the first proof (1837) of the impossibility of doubling a cube and trisecting an arbitrary angle by ruler and compass. However two centuries earlier Descartes had put forward what probably counts as the first proof of these impossibilities. In this paper I analyze this proof, as well as the later related proof given by Montucla (1754) and the brief version of this proof published by Condorcet (1775) . I discuss the many novelties of these early arguments and highlight the problematic points addressed by Gauss (1801) and Wantzel. In particular I show that although Descartes developed many of the algebraic techniques used in later proofs he failed to provide an algebraic impossibility proof and resorted to a geometric argument. Montucla and Condorcet turned this proof into an algebraic one. I situate the analysis of the early proof of the impossibility of the two classical problems in the general context of early modern mathematics where mathematics was primarily viewed as a problem solving activity. Within such a paradigm of mathematics impossibility results arguably do not play the role of proper mathematical results, but rather the role of meta-results limiting the problem solving activity.     

商标:企业的形象产品的护卫

商标,一枚方寸图案,人们有很多十分形象的表述:有人说它是为商品鸣锣开道的使者,是把企业产品介绍给顾客的"红娘",是企业产品的"护身符",是开启市场的"金钥匙",是产品走向市场的"通行证",是企业跨入国际市场的"金护照".没有自己的商标,就没有自己的市场.随着市场竞争的日益激烈和改革开放的不断深化,商标在经济活动中的地位和作用日益显著.     

A comparative analysis of the DARC system and the information and documentation system of the IDC

The article highlights the main results and conclusions of a comprehensive study of the two systems. The main objective of the study was to establish whether any and, if so, which complementarity exists, between the two systems.     

Diversity and complexity of the wustite solid solutions I-tentative rationalization of the miscibility data and classification of the wustite ternary fields and of the postsaturation reactions

A solubility chart of 17 elements substituted for iron in wustite is drawn and interpreted in terms of ionic sizes, coordination preferences and oxygen pressure. The substituted wustite fields in the ternary systems FeMO are classified into 4 types according to the following parameters: trend to the formation of a defined compound, percentage substitution, oxidation number of the substituant and oxygen pressure. The modifications of the wustite point defect structure in these solid solutions are briefly outlined as a function of the substituant oxidation number. Finally, when saturation has been reached, some competing reactions occur which are classified and expressed in terms of oxygen pressure.     

一种高速大功率电子开关测试系统的建模与试验研究

分析了高速大功率RSD(Reversely Switched Dynistor)电子开关开关暂态电流试验平台的构建原理、试验回路的简化模型和基于自积分式罗氏线圈检测系统的工作机理.为便于优化包括RSD开关暂态电流试验平台和罗氏线圈检测装置的整个系统的电气参数,利用MATLAB/SINMULINK仿真环境,建立整个系统的仿真模型,并利用该模型开展试验验证.研究表明,文章获得的描述基于自积分式罗氏线圈整个试验测试系统的仿真模型是可行的,它可以为开关试验状态电流测试试验提供一套合适的计算机仿真平台,有利于优化试验回路和检测系统的电气参数,确保试验成功.     

Fatigue of Structures and Materials in the 20th Century and the State of the Art

The survey is based on the materials of a plenary lecture delivered by the author at the XIV European Conference on Fracture (ECF-14) on September 9, 2002 in Krakow. The author surveys the historical development and contemporary state of scientific and engineering knowledge about fatigue of materials and structures. This includes fatigue as a material phenomenon, prediction models for fatigue properties of structures, and load spectra.     

一种温湿度综合试验系统的研究与设计

研究与设计了一种采用GPIB总线技术和虚拟仪器技术的温湿度综合试验系统,给出了硬件设计原理和软件设计方法。     

A re-parameterisation of the Power Model of the relationship between the speed of traffic and the number of accidents and accident victims

This paper presents a re-analysis of the Power Model of the relationship between the mean speed of traffic and road safety. Past evaluations of the model, most recently in 2009, have broadly speaking supported it. However, the most recent evaluation of the model indicated that the relationship between speed and road safety depends not only on the relative change in speed, as suggested by the Power Model, but also on initial speed. This implies that the exponent describing, for example, a 25% reduction in speed will not be the same when speed changes from 100 km/h to 75 km/h as it will when speed changes from 20 km/h to 15 km/h. This paper reports an analysis leading to a re-parameterisation of the Power Model in terms of continuously varying exponents which depend on initial speed. The re-parameterisation was accomplished by fitting exponential functions to data points in which changes in speed and accidents were sorted in groups of 10 km/h according to initial speed, starting with data points referring to the highest initial speeds. The exponential functions fitted the data extremely well and imply that the effect on accidents of a given relative change in speed is largest when initial speed is highest.     

Determination of the labeling yield and stability of the complexes Bi-BSA-DOTA and Bi-BSA-DTPA

Labeling of a biochemical compound (conjugate) with α-emitting isotopes was studied with the aim to develop a biochemical substance for targeted delivery of α-emitting isotopes to a cancer cell. The ²¹²Bi (²¹²Pb/²¹²Bi) and ²¹³Bi (²²⁵Ac/²¹³Bi) isotope generators were developed. A procedure for preparing the conjugate (monoclonal antibody + chelator) with α-emitting isotopes ²¹²Bi and ²¹³Bi and methods for identification of the labeled conjugate (γ-ray spectrometry and protein staining) are presented. The procedure for calibration of the gel filtration column (GFC) for correcting the GFC certificate data, obligatory in such operations, is described. DTPA as chelating agent appeared to be preferable over DOTA, with 70–80% incorporation of ²¹²Bi and ²¹³Bi into the conjugate reached.     

OLED技术与产业发展的机会与挑战

OLED(有机发光显示)是指有机半导体材料在电场作用下发光的技术,是最有发展前景的新型显示技术之一,也是国际上高技术领域的一个竞争热点。本文介绍了国外技术及产业现状,我国OLED产业的发展情况和产业环境,并就我国OLED产业发展过程中存在的问题提出了一些建议。