溶质原子在再结晶运动晶界上偏聚的研究

Ｂ~（１０）（ｎ，α）Ｌｉ~７裂变反应的径迹显微照相技术被用来研究含硼Ｆｅ－３０％Ｎｉ合金高温热变形再结晶过程中硼在晶界上的偏聚行为，实验表明，含硼Ｆｅ－３０％Ｎｉ合金１０００℃热变形２０％再结晶过程中，运动晶界前方发生硼偏聚而后方发生贫硼现象，而在静止晶界上看不到硼偏聚，随着再结晶新晶粒的长大，运动晶界上的硼偏聚变弱。本文提出，可以用晶界对溶质原子热运动散射的量子理论来解释溶质原子在运动晶界上的偏聚现象。     

套管动力钳转矩监测系统

下套管作业时，套管螺纹联接质量的好坏直接影响着油井寿命，因此有必要研制一种套管动力钳转矩监测系统。以目前国内常用的ＴＱ－２０型套管动力钳为例，介绍了一种与之相配套的套管钳转矩监测系统的功能特点，测试原理，结构设计，并对实测各类紧扣曲线进行了分析。该系统采用主从机结构，主机为工业控制微机，从机为单片机系统，主从机采用远距离通信传输，大大地改善了工业控制微机的工况条件。该系统实现无人监控、自动记录、绘     

The summary of researches on ADS in China

The conceptual study on the accelerator driven system (ADS) that lasted for about five years ended in 1999 in China. As one project of the National Basic Research Program of China (973 Program) in the energy domain, which is sponsored by the China Ministry of Science and Technology (MOST), a five-year-program of fundamental research of ADS physics and related technology was launched in 2000 and passed national review at the end of 2005. The China Institute of Atomic Energy (CIAE), the Institute of High Energy Physics (IHEP), the Institute of Heavy Ion Physics in Peking University (PKU-IHIP) and other institutions jointly carried out the research. The research activities were focused on HPPA physics and technology, reactor physics of external source driven sub-critical assembly, nuclear data base and material study. For HPPA, a high current injector consisting of an ECR ion source, LEBT and an RFQ accelerating structure of 3.5 MeV was built. In reactor physics study, a series of neutron multiplication experimental study has been carried out and still being done. The VENUS facility has been constructed as the basic experimental platform for neutronics study in ADS blanket. It’s a zero power sub-critical neutron multiplying assembly driven by external neutron produced by a pulsed neutron generator. The theoretical, experimental and simulation study on nuclear data, material properties and nuclear fuel circulation related to ADS is carrying on to provide the database for ADS system analysis. The main results on ADS related researches will be reported.     

激光光束质量因子的研究进展

本文详细分析了各种光场下光束质量M2因子。在不同的场中,A.E.Siegman当初所定义的M2因子,已经有了很大的变化,因而M2因子的特性也与当初不同,不仅M2因子可以大于等于1,而且可以小于1,甚至小于0。其反映的物理意义,也从经典场中的衍射极限倍数,变化为非经典场中的准直性量度以及对空间相干性的某些反映。此外还列举并分析了几种特殊的光束质量因子,最后讨论了M2因子应用的问题并指出了其局限性。     

凹凸科技正式进军网络安全

网络安全及电源管理芯片供应商凹凸科技于2月28日正式宣布跻身网络安全领域,并在当天的酒会上向中国用户隆重推介凹凸科技在网络安全领域的独特理念和全新方案;同时对外亮相的还有两款代表性的成熟产品—ASIC防火墙SifoWorks和SSLVPN产品Succendo。凹凸科技成立于1995年4月,在模拟与数字集成电路方面拥有强大的研发队伍和能力,是移动及网络安全通信系统方面的ASIC技术专家,其产品客户广泛遍布于全球各主要电脑、消费电子、工业及移动通信等重要领域。随着混合式防火墙等安全产品的市场需求发展,在ASIC设计领域拥有独特能力和品质保…     

Closed-form solutions for one-dimensional inhomogeneous anisotropicmedium in a special case. I. Direct scattering problem

An analytical formulation is presented for the direct scattering problem of one-dimensional (1-D) inhomogeneous anisotropic medium in a special case. This method gives nonlinear differential equations for the reflection coefficients of the anisotropic medium. Applying the discontinuity condition of the dielectric parameters at the interface of the medium with free space, approximate closed-form solutions for the reflection coefficients are obtained. Numerical examples show the validity of the method     

下运带式输送机液压制动系统的研究

首先对下运带式输送机的制动问题进行了分析,而后介绍了一种新型液压制动系统的基本原理、组成和用途,以及液压制动系统的控制要求和工作状态。实践结果表明,采用该液压制动系统从根本上保证了大倾角下运带式输送机的安全高效生产。     

基坑工程表观监测与安全预警问题的研究

该文阐述了基坑工程的基本特点及复杂性 ,介绍了基坑工程表观监测的基本方法及监测中的若干技术问题 ,提出了基坑工程安全预警的一些量化指标。     

农村饮水工程适宜水质净化技术

农村饮水工程根据不同的原水水质条件，宜采用不同的水质净化技术。对地表水浑浊度长年低于20NTU、瞬间不超过60NTU原水，可采用微絮凝直接过滤加消毒或慢滤加消毒净化工艺；浑浊度长年低于500NTU、瞬间不超过1000NTU的原水，采用混凝沉淀（澄清）过滤、消毒的常规净水工艺。对于特殊水质如氟超标的地下水、砷超标的地下水、苦咸水及其他污染水，根据不同情况，可分别采用活性氧化铝吸附法、混凝沉淀法、多介质过滤法、铁盐混凝沉淀法、电渗析法、反渗透法等不同方式予以处理。     

Effect of RE on Granulation of Eutectic Carbide in Ledeburite Steel

ＲｅｃｅｎｔｌｙｔｈｅｂｅｎｅｆｉｃｉａｌａｃｔｉｏｎｓｏｆＲＥｏｎｉｒｏｎａｎｄｓｔｅｅｌｓｈａｖｅｂｅｅｎｒｅｐｏｒｔｅｄａｒｏｕｎｄｔｈｅｗｏｒｌｄ．ＲＥｃａｎｎｏｔｏｎｌｙｄｅｏｘｉｄｉｚｅａｎｄｄｅｓｕｌｐｈｕｒｉｚｅｔｈｅｍｅｌｔａｎｄｆ...