PA6可变喷射正时喷油泵的优化设计

为了设计ＰＡ６柴油机可变喷射正时喷油尖，建立了相应的工作过程优化的数学模型，并据此设计了ＰＡ６可谈吐在时喷射系统，经计算对比在部分负荷时可望将油耗降低了３％左右。     

一点对多点通讯在卫星测试无线转发系统中的应用

分析了卫星测试无线转发中一点对多点通讯系统中的关键性技术：包括硬件连接、通讯方式及有关技术，并给出了具体方案。     

七号信令系统中TUP和ISUP协议的兼容设计

文中从信令消息，消息参数，信令过程和时限四个方面，对ＴＵＰ和ＩＳＵＰ的协议进行了分析比较，提出了一种兼容ＴＵＰ和ＩＳＵＰ的功能模块ＩＴＵＰ。这种兼容设计方法大大简休了软件编制，提高了软件系统的集成度和代码的可重用性，不仅满足了当前电话网对ＴＵＰ的要求，而且可以方便地向ＩＳＤＮ过渡。     

电场在生物工程中的应用

针对电场与生物工程相结合所具有的独特优势发展出高效、特殊的生物加工的现状,综述了细胞的电穿孔、电场对细胞生长和代谢的影响、电分离、电检测等的应用和研究进展,分析了因细胞对电场敏感性的差异性,电解反应、欧姆热以及设备放大和运行成本等导致一些技术实用中的局限性,尚需进一步的研究。     

某型内燃机闭环控制减振的仿真研究

内燃机自身的振动是重型军用车辆主要的振动和噪声源,对其进行有效的振动控制十分重要.但由于内燃机系统结构的复杂性,研究其振动和噪声控制比较困难.针对某型内燃机系统,采用Matlab软件的Simulink工具,建立了整个系统的动力学仿真模型,并分别对该模型进行简谐、白噪声信号扰动下的减振控制研究,控制方法采用闭环数字PI策略.系统输出转矩和转速的曲线结果表明减振具有明显的效果.     

脱硫废水处理系统工艺设计

本文以西北某发电厂(1X600MW)工程为例,介绍了火力发电厂石灰石湿法烟气脱硫系统所产生废水的水质,及其处理系统.并结合国内其它工程脱硫废水处理系统运行情况提出了对脱硫废水综合利用的建议.     

Micromagnetic Simulation of Magnetization Reversal in SmCo5／Sm2Co17 Magnets

A three-dimensional finite element micromagnetic algorithm was developed to study the magnetization reversal of the SmCo5/Sm2Co17 based magnets. The influences of the microstructure and magnetic parameters on the coercivity were studied based on the model consisting of 64 irregular cells according to the experimental microstructure. Numerical results show that the coercivity increases with increasing the 2: 17-type cell size. Large cell boundary thickness leads to small coercivity. The drop of anisotropy constant of 1:5 phase leads to the coercivity reducing, while the effect of exchange constant of 1 : 5 phase on coercivity is contrary to that of exchange constant. The calculated field dependence of coercivity can be predicted by an inhomogeneous domain - wall pinning model. The microstructure parameter was analyzed by comparing the calculated coercivity.     

一款盲用邮件接收器的设计与实现

盲用邮件接收器是帮助视力障碍者阅读邮件而设计的。盲人借助语音导航,通过上下左右键就能阅读邮箱中的邮件内容。该文主要介绍了运用pop3协议对邮件进行接收,形成相应邮件树型列表,并调用文本朗读(tts)进行语音导航和邮件阅读的实现步骤。     

A geometric constraint solver for 3-D assembly modeling

In this paper, we propose a geometric constraint solver for 3-D assembly applications. First, we give a new geometry and constraint expression based on Euler parameters, which can avoid singular points during the solving process and simplify constraint types. Then we present a directed graph based constructive method to geometric constraint system solving that can handle well-, over- and under-constrained systems efficiently. The basic idea of this method is that it first simplifies the constraint graph by pruning those vertices which have only in-arcs from the graph and then reduces the size of strongly connected components (SCCs) left in the graph by DOF-based analysis. The method can solve all kinds of configurations including closed-loops. After that, we apply a hybrid numerical method of Newton–Raphson and Homotopy to solve under-constrained systems. The hybrid method makes use of the high efficiency of the Newton–Raphson method as well as the outstanding convergence of the Homotopy method. Finally, we give a practical example and conclusion.