Mechanical/Thermal Sources in a Micropolar Thermoelastic Medium Possessing Cubic Symmetry without Energy Dissipation

The present problem is concerned with the study of the deformation of a thermoelastic micropolar solid possessing cubic symmetry under the influence of various sources acting on the plane surface. The analytic expressions of displacement components, microrotation, force stress, couple stress, and temperature distribution are obtained in the physical domain for the Green and Nagdhi (G–N) theory of thermoelasticity by applying the integral transforms. A numerical inversion technique has been applied to obtain the solution in the physical domain. The numerical results are presented graphically for a particular material.     

Tricrystal tunneling evidence for d-wave pairing symmetry in cuprate superconductors.

Strong evidence for d-wave pairing symmetry in high-temperature superconductors such as YBa₂Cu₃O₇ and Tl₂Ba₂CuO_6+δ has been obtained by monitoring the presence or absence of the half-integer flux quantum effect in various controlled—orientation tricrystal superconducting systems. New results of a tricrystal tunneling experiment with Gd Ba₂Cu₃O₇ will also be presented.     

非标双键槽的精确加工

非标双键槽 ,其角度及对称度的精度在加工中很难保证 ,依靠刀具的方位调整及微调刻度盘 ,成功地解决了这一难题。     

The phase diagram of the Yb–Ge system

The phase diagram of the Yb–Ge system was investigated over the whole compositional range by means of differential thermal analysis (DTA), X-ray diffraction (XRD), optical microscopy (LOM) and electron probe microanalysis (EMPA). Besides the already known intermediate phases Yb₂Ge (PbCl₂-type), Yb₅Ge₃ (Mn₅Si₃-type), Yb₁₁Ge₁₀ (Ho₁₁Ge₁₀-type) and Yb₃Ge₅ (Th₃Pd₅-type), two new compounds have been found: Yb₅Ge₄ (Sm₅Ge₄-type) and Yb₃Ge₈, which crystallize with a new triclinic structure type. All the compounds formed in the system have been completely structurally characterized by single crystal determinations.     

火电厂用新型灰渣阀的水力计算

新型的灰渣阀的入口被设计成渐缩段,通过改变传统阀体结构来提高抗磨性能。该型式的阀门可使来流束缩成射流,使高磨损的固液流跳过阀体槽,降低该处所承受灰渣水流的磨损强度。本文介绍了其工作原理,并利用势流理论以及轴对称射流理论对流场进行分析,得出收缩水流的解析式并进行数值计算,给出了阀门入口设计参考值。     

电能质量及其检测方法的研究

简要讨论了电能质量的基本状况，指出了对其进行检测和测量的必要性，讨论了应检测的内容和硬件配置要求，提出了几种可行的检测方法。     

New experimental data revealing an unexpected dimension to materials science and engineering

The experimental portion of this paper deals with the use of Intention Imprinted Electrical Devices (IIED’s) to significantly alter the measured properties of both inanimate and animate materials. The target materials selected for this study were (1) water, (2) the liver enzyme, alkaline phosphatase (ALP), (3) the main cell energy storage molecule, ATP, and (4) living fruit fly larvae. By comparing the separate influence of two physically identical devices, one unimprinted and the other imprinted via a unique meditative process, a robust influence of human consciousness on these four materials has been demonstrated. Furthermore, the IIED’s are shown to produce a ”conditioned” space where oscillations in material properties occur. The theoretical portion provides a speculative, but internally self-consistent, quantitative model for explaining this anomalous data. The model requires an expansion of our conventional thermodynamic perspective to embrace the consequences of physics gauge symmetry changes in nature associated with significant inputs from human consciousness. Received: 18 October 2000 / Reviewed: 23 January 2001 / Accepted: 23 January 2001     

Effective Action Approach to Bose-Einstein Condensation of Ideal Gases

We present a short review of how the effective action formalism, well known in relativistic quantum field theory, can be used to discuss Bose-Einstein condensation of non-relativistic gases. This method lends itself very naturally to an interpretation of Bose-Einstein condensation in terms of symmetry breaking. It also allows for the definition of a very elegant regularization technique involving generalized ζ-functions. We show how this method can be used to recover the well known results for the free boson gas, as well as the charged boson gas in a constant magnetic field. A general criterion for interpreting Bose-Einstein condensation in terms of a phase transition with symmetry breaking is given. Finally we present an analysis of Bose-Einstein condensation in a harmonic oscillator confining potential trap, and show how the results of this simple model are in excellent agreement with experiment.     

关于对称群特征标的计算问题

对称群特征标是有力的数学工具,研究并提出其简单计算方法是很有意义的.在文[1]的基础上进一步探讨了对称群特征标的计算问题,导出了3个新的命题,有利于计算的再简化,还编制了7阶对称群特征标表.     

板坯形状对非回转对称拉深成形性的影响

基于大型覆盖件成形的基础试验研究 ,在大量非回转对称拉深试验和对矩形盒拉深中特定部位进行应力应变解析的基础上 ,分析了板坯形状对非回转对称拉深成形性和成形极限的影响。指出使用矩形切角板坯可在一定程度上缓解非拉深变形并降低成形载荷 ,从而相应地提高拉深成形性和成形极限。