Starting solutions for some unsteady unidirectional flows of a second grade fluid

Exact solutions corresponding to the motions of a second grade fluid, due to the cosine and sine oscillations of an infinite flat plate as well as those induced by an oscillating pressure gradient are determined by means of the Fourier sine transforms. These solutions, presented as sum of the steady-state and transient solutions, satisfy both the governing equations and all associate initial and boundary conditions. In the special case when α₁ → 0, they reduce to those for a Navier-Stokes fluid.     

关于VFP教学过程若干问题的探讨

VFP教学实践证明:以程序设计为主的教材比较适合计算机专业专科学生使用;表单、控制和类是课程中最丰富与最难的部分;加强实验教学,努力提高教师水平,才能有效提高教学质量。     

Neutronic Comparison of Tritium－Breeding Performance of Candidate Tritium－Breeding Materials

Tritium self-sustainment, which will meet the fuel requirement of fusion reactor, is one of the key issues of fusion power development. The tritium breeding performances of various tritium-breeding materials are compared based on a series of neutronics calculations using three-dimensional Monte Carlo neutron-photon transport code MCNP/4C with the IAEA FENDL-2 data library. The effects of the dimensions of the tritium-breeding zone and the enrichment of 6Li on Tritium Breeding Ratio (TBR) are analyzed. The effects of Be as a neutron multiplier on TBR are also calculated.     

飞轮贮能电池的发展与应用

介绍了飞轮贮能电池作为一种新概念电池所具有的优点：比能量、比功率大，寿命长，无二次污染；概括了飞轮储能电池所涉及的相关技术领域；对国内外飞轮储能技术的发展现状、主要应用领域和发展趋向进行了详细的论述。     

锂离子蓄电池正极材料LiFePO4的研究进展

锂离子蓄电池正极材料的研究正在向高比能量、长寿命、低成本、环境友好的方向发展。橄榄石型LiFePO4近年来引起注意。由于它具有170mAh/g的理论比容量和约3.5V的电压、较好的常温和高温稳定性、低廉的成本和优良的环保性能,有望作为大型移动式锂离子蓄电池的正极材料。对该材料的特性及研究情况进行了较为全面的总结,重点介绍了其结构特点与性能的关系,以及国外为改进其综合性能而进行的有关研究:(1)LiFePO4制备方法(包括高温固相合成法和低温液相合成法);(2)导电性物质的修饰以提高其在大电流密度下的比容量;(3)常温和高温贮存稳定性的实验;(4)LiFePO4的离子导电性和电子导电性。     

低压断路器的新材料和新工艺应用

对引进德国西门子公司技术制造的3WE系列断路器在新材料和新工艺应用方面与国内此领域传统使用的材料和工艺进行了分析、对比。期望能对国内同行在产品设计、制造和改进过程中起到借鉴和参考作用。     

ASIC验证技术

描述ＡＳＩＣ验证方法和过程，有助于ＡＳＩＣ设计者对验证的认识。模拟是验证ＡＳＩＣ并产生测试矢量的唯一途径，设计者可以对ＡＳＩＣ芯片或者在ＡＳＩＣ应用系统中进行功能和时序模拟。     

材料脆化对汽轮机组启动预热和超速试验温度的影响

分析了长期服役汽轮机转子产生的材料脆化现象，提出了老机组的启动预热温度和超速试验温度应以转子的脆性转变温度变化量△FATT为依据进行制定，才能预防转子的脆性破坏，确保老机组的安全可靠运行。     

纤维缠绕外压容器稳定性最佳铺层分析

在纤维缠绕压力容器设计中，纤维缠绕的方向及各方向纤维用量配比是关键问题。过去的研究中，这一问题一直没能得到很好地解决，特别是各方向纤维用量问题。本文在文献［１～４］的基础上，以加权因子和铺设角为参量给出了对称多层正交各向异性外压容器筒体失稳的最佳铺层理论值。得出了加权因子ｓ取最佳值的范围为０＜ｓ＜０．２５的结论。文中算例表明，按最佳取值给出的临界压力较其它情况有较大幅度的提高。     

Polarization Phase-Based Method For Material Classification In Computer Vision

A robust and accurate polarization phase-based technique for material classification is presented. The novelty of this technique is three-fold in (i) its theoretical development, (ii) application, and, (iii) experimental implementation. The concept of phase of polarization of a light wave is introduced to computer vision for discrimination between materials according to their intrinsic electrical conductivity, such as distinguishing conducting metals, and poorly conducting dielectrics. Previous work has used intensity, color and polarization component ratios. This new method is based on the physical principle that metals retard orthogonal components of light upon reflection while dielectrics do not. This method has significant complementary advantages with respect to existing techniques, is computationally efficient, and can be easily implemented with existing imaging technology. Experiments for real circuit board inspection, nonconductive and conductive glass, and, outdoor object recognition have been performed to demonstrate its accuracy and potential capabilities.