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.     

On the Relationship Between the H-Tensor and the Concentration Tensor and Their Bounds

For composite materials, two quantities that are useful for characterizing the contribution of inhomogeneities in a matrix material to the overall properties are (1) the individual H-tensor, H _i , which describes the contribution of a single inhomogeneity and (2) the overall strain concentration tensor, which describes the relationship between the overall volumetric strain to the average strain of all of the inhomogeneities. In this paper, we develop a relationship expressing the overall H-tensor, ${\mathcal{H}}$ , in terms of the overall strain concentration tensor. An important feature of the derivation is that it allows for rigorous upper and lower bounds on the overall H-tensor. In the special case that the inhomogeneities are all the same, with the same orientation, then ${\mathcal{H} = {\bf H}_i}$ , and the results derived for ${\mathcal{H}}$ also hold for H _i .     

Tatara and the Japanese sword: the science and technology

Tatara, a traditional steel-making system developed in Japan, and the Japanese sword are briefly introduced from a technological point of view, followed by some comments on scientific aspects. Attention is paid to the comparison with methods developed in foreign countries. The quenching process being operated in the final stage of sword making is focused on, and results of a computer simulation by a code COSMAP based on metallo-thermo-mechanics are presented to know how the temperature, metallic structure and stress/distortion vary in the process.     

碳纤维表面处理及其对碳纤维/树脂界面影响的研究

碳纤维增强树脂/石墨复合材料是树脂/石墨双极板材料的一个主要研究内容,纤维与树脂间的界面结合是其中的关键问题.综述了碳纤维的氧化处理、偶联剂涂层处理和等离子体处理方法及各种处理方法对碳纤维/树脂界面的影响.对碳纤维的表面处理,可以提高碳纤维与树脂的界面粘接力,获得良好的界面层,达到对界面的优化处理.     

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。     

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。     

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。     

New results for the spin of the Eulerian triad and the logarithmic spin and rate

Summary A new basis-free expression is derived for the logarithmic spin tensor, which assumes a unified form for all the three cases of coalescence of the three eigenvalues of the left Cauchy-Green deformation tensorB. It is shown that this new expression is endowed with particular continuity properties, i.e., each of its coefficients either accompanies the vanishing of its associated term or remains valid whenever the eigenvalues ofB become repeated. These favorable properties, which are not enjoyed by the expressions derived earlier, result in the foregoing unified form of expression which could not be achieved by means of the previous expressions. At the same time, a fully explicit, basis-free expression is obtained for the spin tensor of the Eulerian triad, which is expressed straightforwardly in terms of the three basic invariants ofB and hence renders computations of the eigenvalues ofB unnecessary. Moreover, remarks are given towards explaining and clarifying some issues concerning the hypo-elastic equation of grade zero with the logarithmic rate, including the exact integrability and unstable stress responses associated with initial shear stresses at simple shear deformations, etc.     

On the efficiency and accuracy of the boundary element method and the finite element method

The efficiency and computational accuracy of the boundary element and finite element methods are compared in this paper. This comparison is carried out by employing different degrees of mesh refinement to solve a specific illustrative problem by the two methods.     

整合价值系统规划

The author introduces a successful corporate image design sample of Shenzhen Power Creator CI Design Co.Ltd.The project is the whole systematic package of MI,BI and VI of Dongjiang Group ,which represent and conform the value of the corporate .Power Creator believes that the image of a company is a relationship ,including the relationships amidst corrporate ,clients,consumers ,government ,suppliers and the whole society ,and its establishment is a systematic project.Accordingly ,the image design should let the value expose and should form a system so as to create the power .     

Theoretical and experimental study of the aluminization of iron and steel in the pack and in the gas phase

A theoretical model which combines gaseous transport and solid state diffusion with the multicomponent equilibria at the gas-pack and gas-coating interfaces was used to study the pack aluminization of iron and steel. It allows the surface composition and the growth rate to be calculated. For a given activator they depend on the temperature and the aluminium activity in the pack. A good agreement is obtained between the theoretical predictions and the experimental results when the parts to be treated are embedded in the pack. Theoretical predictions for deposition in the gas phase, onto substrates out of contact with the pack, can be qualitatively deduced, and the conditions for obtaining uniform coatings in the gas phase are pointed out.     

干涉滤光片中心波长检定结论用于分光光度计量值传递的两难性与出具证书形式的探讨

用于作波长标准的干涉滤光片．在自检和量值传递过程中涉及到三个国家规程．其中的规定各有侧重,容易使人在执行中顾此失彼．得出错误结论。本文提出的方法解决了这个问题。     

论知觉对象与背景的关系

通过将"万绿丛中一点红"中的哲学原理在广告的创意、制作中的运用得到的经验,阐述了这样的原理:知觉对象与背景是通过对比与协调达到和谐统一的,它们通过色彩与造型的差异性和互补性,产生奇特的视觉效果,给人以鲜明的印象和强大的视觉冲击力,从而达到吸引消费者的目的.这在广告学中有着至关重要的作用,也是众多广告设计中都遵守的原则之一.     

大直径盾构侧穿地铁站的变形预测与实测结果分析

通过数值计算方法对北京地下直径线侧穿地铁2号线某车站的结构变形进行预测,并将预测值与实测值进行对比和差异性原因分析,以期对类似工程预测变形、指定控制指标有一定指导作用。     

浅谈检测实验室的认可及其益处

通过济钢质检中心实施实验室认可工作的体会,论述了认可管理体系在实验室管理中的重要性,明确了认可管理体系的有效运行是实验室技术能力的可靠保证.