WC/Ni60真空熔烧涂层的组织结构特性

研究了真空熔烧WC Ni60复合涂层的显微组织结构特性 ,并测定了沿层深方向的显微硬度分布。研究结果表明 ,涂层与母材 4 5钢在界面处形成牢固的冶金结合 ,界面两侧的显微硬度呈连续性分布     

Evaluating Liquefaction Strength of Partially Saturated Sand

A method is presented for evaluating the liquefaction strength of partially saturated sand using the compression wave velocity (P-wave velocity), a new indicator of saturation. Based on laboratory test results, an empirical correlation that relates the liquefaction strength with the pore pressure coefficient B is firstly proposed. The strength is defined as the cyclic stress ratio required to cause liquefaction at a specified number of cycles. With the aid of a theoretical relation between B and the P-wave velocity, an explicit correlation of more interest is then established between the liquefaction strength of sand and its P-wave velocity. A comparison of the predictions using this explicit correlation with laboratory measurements shows a satisfactory agreement. The significance of this method lies in that it makes it possible to evaluate the liquefaction strength of sand as affected by saturation through the measurement of P-wave velocity, which can be made not only in the laboratory but particularly in the field.     

铝基印制电路板制造工艺研究

此文对一种进口铝基印制电路板的制造工艺流程进行了介绍,对所采用的制造工艺技术进行了较为详细的论述。     

空调表冷器性能微机测试系统设计与软件开发

介绍了一套用于空调表冷器性能测试的试验装置及配套软件，重点叙述了系统的总体构成、程序的设计思想以及数据采样和处理等功能模块。微机测试技术以及配套软件的使用大大减少了测试人员的工作量，并在一定程度上提高了测试的精度。     

Effects of Background Plasma on Free Electron Laser with Planar Wiggler

Dispersion equation of planar-wiggler free-electron laser with background plasma is derived using linear fluid theory. The characteristic of this plasma FEL is analyzed in detail. It is shown that reasonable background plasma density tends to improve FEL growth rate. We also find there exits a critical plasma density for FEL operating. When the background plasma density is higher than critical density, the FEL can no longer be excited.     

大规模MPLS网络中的新兴技术

随着网络规模越来越大,选择一个完善的网络管理框架并有效降低标签需求量对于MPLS网络而言显得十分重要。为此,探讨了基于策略的MPLS管理以及Trainet等近年来出现的大规模MPLS网络新兴技术,并与现有相关技术进行了比较。     

2005年中国电信运营市场发展现状与展望

2005年是中国电信业的“转型年”．国内电信运营商依赖投资拉动增长速度减缓的趋势得以深化。国内电信运营商的投资更加趋于理性。通过总结2005年田内电信运营市场态势、各运管商发展策略、行业热点及未来展望四个方面阐述国内电信运营市场的发展状况。     

A novel nickel-based mixed rare-earth oxide/activated carbon supercapacitor using room temperature ionic liquid electrolyte

Mesopore nickel-based mixed rare-earth oxide (NMRO) and activated carbon (AC) with rich oxygen-contained groups were prepared as electrode materials in a supercapacitor using room temperature ionic liquid (RTIL) electrolyte. These electrode materials were characterized by XPS, XRD, N₂ adsorption, SEM as well as various electrochemical techniques, and showed good properties and operated well with RTIL electrolyte. A 3 V asymmetrical supercapacitor was fabricated, which delivered a real power density of 458 W kg⁻¹ as well as a real energy density of 50 Wh kg⁻¹, and during a 500-cycle galvanostatic charge/discharge measurement, no capacity decay was visible. Such promising energy-storage performance was to a large extent ascribed to nonvolatile RTIL electrolyte with wide electrochemical windows and high stable abilities worked with both electrode materials.     

个性设计

Corus Bausysteme的新KalzipFP立面系统为个性设计创造了广阔的空间．并且使每座建筑都具有自己独一无二的特色。它既适用于建筑的翻新．也适用于新建筑的修建。类似于Kalzip屋顶系统．不同的表面处理（天然的灰泥浮雕、铝加锌、铝加铜）以及各种颜色（有颜色的表面涂层、PVDF或聚酯涂层）都可以采用这种后置通风的立面系统。也可以采用抗涂鸦涂层．它可以保证在不破坏原有覆层的前提下．完全去除损毁的部分。长跨度闸盒的覆盖宽度为250mm、300mm、333mm、500mm和600mm．用一个隐形的弹夹系统就可以将它们安装在有凹口的窗棂上．而不需采用铆钉和螺丝。