3-甲基-7-二正丙氨基-1,4-氧氮杂萘-2-酮的合成

以间氨基酚为原料,经N 烷基化、亚硝化,制得2 亚硝基 5 二正丙氨基苯酚,其收率为91 6%。该化合物经还原、成环反应后,合成出3 甲基 7 二正丙氨基 1,4 氧氮杂萘 2 酮,其收率为80 3%。实验确定1 溴丙烷、亚硝酸钠及丙酮酸乙酯的最佳用量分别为70mL、11 5g和2mL(以15g间氨基酚为基准)。     

基于面向对象技术的图书馆管理系统研究

基于面向对象技术在软件开发中得到了广泛的应用。图书馆管理系统需求的复杂性要求其采用面向对象方法进行系统分析和设计．基于此，本文对基于面向对象技术的网络化图书馆管理系统进行了研究；首先介绍了Browser／Server系统结构和面向对象的系统分析技术，结合图书馆的实际要求，对图书馆管理系统进行了需求分析、功能模块划分、数据库模式分析，然后对图书馆管理的相关内容进行了分析，最后研究了图书馆管理系统的框架结构以及主要模块．     

大机组调峰对锅炉运行的影响及运行优化研究

利用炉膛断面温度场可视化监测系统、节能环保车、炉内三维数值模拟等先进的技术和设备对大机组调峰稳定性和运行方式优化进行试验和理论研究。     

Dynamic deformation behavior of ultrafine-grained low-carbon steels fabricated by equal-channel angular pressing

The dynamic deformation behavior of ultrafine-grained low-carbon steels fabricated by equal-channel angular pressing (ECAP) was investigated in this study. Dynamic torsional tests, using a torsional Kolsky bar, were conducted on four steel specimens, two of which were annealed at 480 °C after ECAP, and then the test data were compared in terms of microstructures, tensile properties, and adiabatic shear-band formation. The equal-channel angular pressed specimen consisted of very fine, equiaxed grains of 0.2 to 0.3 μm in size, which were slightly coarsened after annealing. The dynamic torsional test results indicated that maximum shear stress decreased with increasing annealing time, whereas fracture shear strain increased. Some adiabatic shear bands were observed at the gage center of the dynamically deformed torsional specimen. Their width was smaller in the equal-channel angular pressed specimen than in the 1-hour-annealed specimen, but they were not found in the 24-hour-annealed specimen. Ultrafine, equiaxed grains of 0.05 to 0.2 μm in size were formed inside the adiabatic shear band, and their boundaries had characteristics of high-angle grain boundaries. These phenomena were explained by dynamic recrystallization due to a highly localized plastic strain and temperature rise during dynamic deformation.     

Development of the critical film thickness correlation for an advanced annular film mechanistic dryout model applicable to MARS code

It is generally assumed in the mechanistic film dryout model that the critical heat flux (CHF) arises when liquid film calculated from evaporation, droplet entrainment and deposition gets dryout. The dryout of film is usually assumed when film thickness becomes zero. However, it was indicated that the complete dryout assumption can estimate CHF well for uniform heating case but cannot simulate accurately for non-uniform heating case. The critical film thickness concept may be an appropriate approach physically because there is a possibility of instantaneous disappearance of liquid film when it gets very thin. Therefore, a critical dryout film thickness correlation was developed to properly model dryout phenomenon together with MARS code based on experimental data. The modified version of MARS implementing a newly developed critical dryout film thickness correlation was assessed using various dryout data including those of non-uniform heating case and flow reduction transient test. The prediction results showed improved agreement with the experimental data.     

堆泵浦3He-Ar-Xe激光体系小信号增益与效率实验研究

介绍了CFBR-Ⅱ堆泵浦3He-Ar-Xe体系1.73μm波长激光小信号增益和泵浦效率的实验研究.在脉冲峰热中子注量率为6.9×1014cm-2.s-1、3He、Ar、Xe气体的比例为80.219.30.5,总压强为8.3×104Pa时,采用透射率从1.7%到10%的6个谐振腔输出镜均获得了激光输出.在谐振腔输出镜透射率为7%时,得到了激光脉冲峰功率为45mW,其对应的激光泵浦效率为1%.在此基础上,利用Rigroa分析方法拟合出3He-Ar-Xe体系激光的小信号增益为0.24%/cm,饱和光强为36W/cm2.     

500kV变电所保护小室设计及抗干扰措施

随着计算机软硬件技术、网络技术，通信技术的发展，计算机监控系统在500kV变电所中已广泛应用。在一些工程中，为减少控制电缆，缩减主建筑占地面积，二次设备采用了放至配电装置区的方式。由于弱电设备多，环境电压等级高，电磁干扰强，使许多人对这种方式的安全可靠性提出了疑问。本文着重从干扰源、抗干扰措施及保护小室的设计角度作了分析，对保护小室下放模式的安全可靠性作出肯定，并对小室屏蔽设计提出了一些看法。     

Microstructures of laser cladding of intermetallic-ceramic composite coatings

The microstructures of laser cladding of (Ni-24.5%(atom fraction)Al)+5O%(mass haction)WC coatingsbefore and after aging was comparetively studied by using SEM and TEM. It is shown that dissolving of WC and reprecipitating in the forms of WC and W,Coccurred during laser cladding, and intermetallic γ' (Ni3Al) orderly precipitatefrom metastable supersaturant Ni-matrix solid solution after heat treatment. The structures are favorable for coating'sproperties.     

A flexible and recoverable client/server database event notification system

A software architecture is presented that allows client application programs to interact with a DBMS server in a flexible and powerful way, using either direct, volatile messages, or messages sent via recoverable queues. Normal requests from clients to the server and replies from the server to clients can be transmitted using direct or recoverable messages. In addition, an application event notification mechanism is provided, whereby client applications running anywhere on the network can register for events, and when those events are raised, the clients are notified. A novel parameter passing mechanism allows a set of tuples to be included in an event notification. The event mechanism is particularly useful in an active DBMS, where events can be raised by triggers to signal running application programs. Received July 21, 1995 / Accepted May 30, 1996     

交换机LS中继全自动维护的实现

环路启动(LS)中继在电力专网中使用非常广泛,人工恢复长时间不拆线的LS中继的维护方式已经不能满足需求,故利用开发工具(Delphi)编写软件实现和交换机通信,自动检测所有LS中继线的状态,自动恢复长时间处于维护忙状态的LS中继。文章介绍了该系统的实现过程及系统中各模块的功能。该系统的实现提高了工作效率,保障了交换网的通信质量。