锚杆用水泥砂浆配合比设计

水灰比和灰砂比是锚杆用水泥砂浆设计的关键要素,砂浆流动度是影响砂浆工作性的主要因素。本文总结了锚杆用水泥砂浆配合比设计中遇到的问题,并基于相关试验与施工现场资料,提出了相应的改进措施和解决方法,为相关工程设计工作提供参考。     

Fast Image Retrieval of Textile Industrial Accessory Based on Multi-Feature Fusion

IntroductionGenerally,traditionalsearchsystemsoftextileindustrialaccessoryareallbasedondetailedinformationofaccessoriesprovidedmanually.Inthesesystems,thesearchwithkeywords,includingaccessoryserialnumber,OEMnumber,machinemodeletc.,isperformedusingtextsearchtechnique.However,whenanaccessoryoritsscratchisgivenwithoutdetailedinformation,suchsearchsystemcanfindnowayout.Inaddition,asitisverydifficulttoperformthesimilaritycomparisonbetweenthequeryandthetargetmanually,aretrievalsystem,usingsomevisi…     

基于WinCE的物流配送实践项目的开发

基于ARM9嵌入式设备和WinCE的物流配送系统由客户服务、库房管理和运输服务模块组成,分别完成商品的订购、货物的出货和装车以及路线查询和运输功能。设备中的嵌入式数据库可运用合并复制的方法与服务器数据库数据实现同步,使得物流配送系统中的数据通过硬件平台和Web网页都能获取,充分展现了嵌入式数据库和嵌入式设备在物流配送系统中的应用给人们带来的快捷和方便,结果表明,该系统在基于WinCE的ARM9嵌入式设备上实现是完全可行的。     

面向下一代光伏产业的硅太阳电池研究新进展*

以晶体硅为代表的第一代太阳电池和以非晶硅薄膜为代表的第二代薄膜太阳电池目前是光伏市场主流。第三代纳米结构太阳电池研发目标是在维持现有第二代薄膜电池沉积技术的经济性和环保性基础上显著提高电池性能及稳定性,进一步降低太阳电池的价格至每瓦0.5美元,甚至0.2美元及更低。笔者将简要综述近年来国际上面向下一代光伏产业的硅太阳电池研究新进展,内容集中在纳米硅薄膜叠层太阳电池、硅纳米线（包括轴向、径向和单根）太阳电池和基于多重激子效应的纳米硅热载流子太阳电池等三个方面。     

SURFACE SPIN WAVES FOR A SEMI-INFINITE FERRIMAGNET WITH A SINGLE ION UNIAXIAL ANISOTROPY IN THE PRESENCE OF MAGNETIC IMPURITY LAYER

A C3Cl-type(bcc)-semi-infinite ferrimagnet with a single-ion uniaxial anisotropy and a magnetic impurity layer is considered through combining Green‘s function theory with the transfer-mairx method.The effect of the anisotropy term and the impurity layer on surface spin wave specirum is discussed.The influence of the impurity layer‘s distance from the surface or surface spin woves is also concerned.     

TRANSFER-MATRIX METHOD FOR SURFACE SPIN WAVES IN A SEMI-INFINITE MAGNETIC SUPERLATTICE WITH A SINGLE-ION ANISOTROPY

Surface spin waves in a semi-infinite magnetic super lattice with a single-ion uniaxial anisotropy are investigated through the transfer matrix method. The dispersion equations of surface spin waves are obtained. We find that not all the magnetic superlattice structures can excite the surface spin waves, and that the anisottropy term need not be favorable to the excitation of surface spin waves, but surely influences the values of the energy of the excited surface spin waves.