The Metal-Dielectric Resonator Method of Measuring the Parameters of Radio Materials

The use of symmetrical H- and E-modes and asymmetrical E-modes in a longitudinally anisotropic dielectric cylinder with metal mirrors at the ends to measure its permittivity and dielectric loss tangent is considered. It is shown that the method has wider possibilities compared with the IEC-61338 recommendations. The results of a measurement of the dielectric parameters of a number of materials in the 2–78 GHz frequency band, including the permittivity tensor of sapphire, are presented. __________ Translated from Izmeritel'naya Tekhnika, No. 9, pp. 65–70, September, 2005.     

全棉紧密纱色织物的生产技术

介绍了紧密纱的特点和细特高密色织物的设计与开发过程,在此基础上对紧密纱色织物生产过程中各主要工序的工艺参数与技术措施作了详细阐述,其中重点探讨了紧密纱的上浆技术,认为应采取“小张力、低黏度、中压力、重浸透、低上浆、高回潮、少用PVA”的工艺原则。     

A note on the divergence problem arising in calculation of Green’s function for a 2D piezoelectric thin film strip containing straight line defects and free boundaries: Fourier approach for bodies of unrestricted anisotropy

In this paper we derive a set of novel formulas for computation of the Green’s function and the coupled electro-elastic fields in a 2D piezoelectric strip with free boundaries and containing a distribution of straight line defects. The strip is assumed to be of unrestricted anisotropy, but allowing piezoelectricity, and in this sense situation is more general than in the available literature where only cubic symmetry was investigated. We employ a set of already known analytic formulas for the Fourier amplitude of the Green’s function and the corresponding electro-elastic fields. The key novelty of this paper is solution for the divergence problem occurring during integration of the Fourier amplitude. This problem is caused by poles at k = 0 in various matrix components of the amplitude. From purely mathematical point of view such poles lead to quantities which do not tend to zero at infinity, and this situation is clearly unphysical. To resolve this issue it is demonstrated by means of rigorous analysis that when some additional physical conditions are imposed, physical fields exhibit regular behavior at infinity - the poles do not contribute. Nevertheless, they lead to irremovable numerical ∞ − ∞ uncertainties spreading over the whole domain of integration. This motivates us to compute exact formulas for all these poles to enable engineering calculations involving the system in question.     

Plenary Session: The Operator's Reliability and Safety in Industry L'Homme Agent d'infiabilite et de Fiabilite du Processus Industriel

When we look at the course of development of world civilization, we can recognize that the speed of development is becoming faster and faster. The author tries to examine the possible danger of this accelerated speed or change and to explain Japan's high pitch development after the opening of her door to the western world about 100 years ago. Ho also explains how human factors studies have been developing in Japan and their significance with regard to social change. Concerning this rapidly changing world civilization, he discusses the mission of human factors research in the future and the ways to maintain humanity.     

Accelerated convergence for a normal state layered superconductor’s transverse resistance expression,measured with strip contacts

The expression of the transverse resistance for an ohmic parallelepipedic layered conductor, measured with strip contacts, extended along its width, is a slowly convergent series. This series is reworked and transformed to the sum of an analytical part and an exponentially convergent series, which reduces considerably the number of terms needed for the numerical evaluation. In addition, an asymptotic formula is obtained, valid for Γ < 2, Γ is the effective anisotropy. This formula is used to determine the room temperature resistivity anisotropy of two small Γ layered superconductors, which are 2H–NbSe₂ and 2H–TaSe₂.     

CS夹芯板抗弯性能的试验研究

通过CS夹芯板抗弯性能的试验,重点研究织物加强对改善夹芯板抗弯及抗裂性能的作用。试验研究表明,织物加强的CS夹芯板具有很好的抗弯抗裂性能。并根据受弯机理分析,提出相应的开裂弯矩和极限弯矩计算公式,计算结果与试验结果吻合较好。     

CLOS网络型大规模ATM交换结构

首先提出了大规模ＡＴＭ交换网络应满足的基本特性，然后对Ｃｌｏｓ网络型大规模ＡＴＭ交换网络进行了研究，给出了交换网络连接级呼叫的无阻塞条件，论述和分析了一种适合于以信元为单位的分散式路由选择算法。     

A study of the thermal performance of reflective coatings for the urban environment

This paper presents the results of a comparative study aiming to investigate the effect of reflective coatings on lowering surface temperatures of buildings and other surfaces of the urban environment, and thus test their suitability to lower ambient temperatures and fight the heat island effect. In total, 14 types of reflective coatings, selected from the international market were studied, from August to October 2004, on a 24 h basis. These coatings are used in buildings and some of them are used or could be used in the future in other surfaces of the urban environment (sidewalks, parking lots, etc.). In order to investigate the thermal performance of the reflective coatings, surface temperature sensors and a data logging system as well as infrared thermography procedures were used. The spectral reflectance and the infrared emittance of the samples were also measured. The collected data have been extensively analyzed. It was demonstrated that the use of reflective coatings can reduce a white concrete tile’s surface temperature under hot summer conditions by 4 °C and during the night by 2 °C. It can be warmer, than the ambient air by only 2 °C during the day and cooler than the ambient air by 5.9 °C during the night. “Cool” coatings present superior thermal performance even compared to other “cool” materials. This study can assist in choosing more appropriate coatings for building envelopes and other surfaces of the urban environment, and thus contribute to the mitigation of the heat island effect as well as the reduction of cooling loads and electricity consumption of buildings.     

光刻探头的共振压力显微系统的研究

以磁共振压力显微和半导体核子自旋态研究为目的,采用电子束和等离子体刻印方法制备硅振荡器,脉冲调制序列控制磁共振条件频率和旋转框架翻转,依据样品的自旋-晶格弛豫时间和自旋-自旋弛豫时间,获得了共振显微压力,测试了压力显微的灵敏度。结果表明,光刻的探头具有高Q值和软悬臂低倔强系数K,磁共振压力通过扫描片段和激光光纤干涉得到了极其微小的压力。光刻探头的共振压力显微具有高空间分辨率,兼具核磁共振成像(MRI)和原子压力显微技术(AFM)优点,是一种重要的核自旋探测技术和三维原子分辨率成像的有力方法。     

碳纤维复合材料趋肤效应研究

良导体在平面电磁场作用下的趋肤效应有简单的公式描述,而涡流检测中电各向异性材料的趋肤效应却非常复杂。该文通过对碳纤维复合材料的涡流检测进行有限元仿真,研究涡流检测中电各向异性材料的趋肤效应。