高校学生注册收费管理系统研究——以南海广播电视大学为例

学生注册收费管理工作是学校财务管理工作的中枢。随着学校规模的不断扩大,各种类型的学生逐渐增多,传统的账务管理方式和工作手段已经难以满足要求。财务收费任务繁重,出现缴费统计困难或者信息流转通畅程度差、在各部门信息先后不一致、信息时效性滞后等问题。针对这些问题,开发了基于B/S结构的学生注册收费管理系统。     

基于无线通信方式的TV二次压降现场测试方法

针对传统的TV二次压降现场测试方法存在的问题,提出基于无线通信技术的检测方法。以提高工作效率,降低安全风险。     

Numerical and experimental studies on hydrodynamic characteristics of sleeve regulating valves

The sleeve regulating valve is a kind of control valve, which widely used in natural gas transportation. Jet flow generated in valve throats will impact on the surface of the valve body and the valve clack, and then cause the destruction of the valve. In this work, two regulators were designed to reduce the hydraulic impacts, and the effects of regulators on the hydraulic performance of the sleeve regulating valve are investigated in detail. Numerical and experimental studies were applied. Results indicate that the introduction of a regulator reduces the value of flow coefficient (K_V), and the reduction is greater with larger valve opening. Meanwhile, the flow coefficients for the valve with regulator I is a bit larger than that with regulator II. The results also demonstrate that the employment of regulator decreases the entropy production rate (EPR) of high EPR regions, reduces the pressure drop of valve throats, and slows down the velocity in the valve throats. Thus the impacts of the fluid on the throat walls are weakened by regulators. It is noted that the reduction of impact forces with regulator I (has small round holes) is larger than that with regulator II (with two rows of oval holes).     

现代有轨电车杂散电流危害的监控防护分析

对现代有轨电车杂散电流危害做出分析,并详细介绍了杂散电流系统的防护和监测系统的应用。     

Influences of SiC infiltration and coating on compressive mechanical behaviours of 2D C/SiC composites up to 1600 °C at wide-ranging strain rates

The influences of the SiC infiltration and coating on the compressive mechanical behaviours of 2D C/SiC composites were determined up to 1600 °C at 0.001 and 1000/s strain rates in argon and air. In addition, the failure mechanisms responsible for the compressive mechanical behaviours were elucidated through in-situ observation and micro-analysis-based methods. The 2D C/SiC composite compressive strength was highly sensitive to temperature, loading rate, and oxidation, and was enhanced by the change in the thermal residual stress and decreased by oxidation. In argon, because of the extra infiltrated SiC matrix, SiC treated 2D C/SiC specimens exhibited higher compressive strengths and lower strain rate sensitivity factors than SiC untreated 2D C/SiC specimens. The SiC coating effectively improved the oxidation resistance of the 2D C/SiC composites in air, regardless of the temperature, strain rate, and oxidative damage-which depends on SiC coating, strain rate, and temperature.     

地方城市统一测量坐标系选择的探讨

通过对地方独立坐标系的分析,结合实际工作的需求,对建立地方统一坐标系的原则和方法进行了探讨。     

一种螺旋输送机的改进设计

通过一次闲置的螺旋输送机改造过程,叙述了螺旋输送机改造中需要注意的几个相关事项,并对螺旋输送机现场改造中涉及到的问题提出了相应的解决办法。     

商业用户燃气报警控制系统选型的探讨

针对一些商业用户用气点较多,进行燃气报警控制系统选型的理论研究,并且结合我区工程实例,作出可行性及经济性比较。     

10kV配网系统中性点经消弧线圈接地方式的探讨

针对10kV配网系统电缆出线增多及电网规模的不断扩大,分析中性点经消弧线圈接地系统原理.探讨10kV配网系统中性点经消弧线圈接地方式的应用.