油田废水余热发电的可行性分析

分析了某油田废水的特性,提出特油污水热能综合利用的方案,并设计了工艺流程图．结果表明,该工艺不但可以充分利用污水的低温余热,每天产生10．2×104kW·h的电能．该系统还有助于削减二氧化硫和二氧化碳污染物的排放．关于油田废水污水对换热设备造成的腐蚀问题,可将涂层或者镀层应用于金属表面是比较方便和经济的．     

现代电力市场营销策略探讨

随着我国电力市场化不断推进,社会对供电服务的要求也越来越高。本文从我国电力市场现状入手,对电力市场营销的内涵及制约现代电力市场营销的因素进行了分析,提出了现代电力市场营销策略的建议。     

无线听音系统的分析及计算

本文分析了建立无线听音系统的基本原理,导出系统设计的计算方法,并给出系统测试方法。     

核心竞争力与人才资源

无论是企业核心竞争能力还是国家竞争优势都离不开人才资源的创建和壮大。介绍了人才资源的含义，澄清了人才、人力资源等概念的区别，论证了为什么人才资源是构建企业核心竞争能力和国家竞争优势的核心资源。     

指数Diophantine方程pa-pb-pc=z2

设p是奇素数。本文给出了方程pa-pb-pc=z2的全部非负整数解(a,b,c,z)。     

一种求解非线性优化问题的可行方向法

针对目前常用的解线性约束的非线性优化问题的方法在实际应用中还存在不收敛、收敛较慢,或"基变量大量达界后,找不到新的入基变量"等问题,该文提出了求解该问题的新方法夹逼可行方向法,已证明算法的最优性与收敛性。指出夹逼可行方向法可视为Frank-Wolfe算法的推广,也可视为是Zoutendijk可行方向法和逐次线性近似方法的改进算法。算例表明,算法收敛速度较Zoutendijk可行方向法、Frank-Wolfe方法等有了较大提高。算法已被研制成实用软件,并成功应用于三峡电力系统优化调度和调峰方式研究中。     

Fe-13Cr-5Ni马氏体不锈钢在连续加热过程中两相区的奥氏体生长行为

通过光学显微镜、透射电子显微镜、X射线衍射仪以及显微硬度仪研究Fe-13Cr-5Ni马氏体不锈钢在加热过程中的组织转变行为.结果表明,Fe-13Cr-5Ni钢在10℃·s-1的加热速率下,加热至奥氏体单相区,冷却至室温后具有明显的“组织遗传”现象.奥氏体以“针状”形式在马氏体板条界处形核并沿着马氏体板条界长大,与母相间保持Kurdjumov-Sachs(K-S)位向关系.加热至两相区不同温度然后淬火至室温,奥氏体的量随两相区保温温度的升高先增加再减少,650℃时对应室温下残余奥氏体的极大值,并且这一变化趋势与试样显微硬度测试结果所得结论一致.     

辐射与组培复合育成“霞光”等14个菊花新品种

辐射诱变与组织培养相结合，育成了“霞光”等１４个菊花新优品种；对品种来源及形态特征进行了简要描述，并对有关育种技术问题进行了讨论。     

Time-Sharing Power Supply Optimal Decision forElectrolytic Deposition Process of Zinc Based on Simulated Annealing Algorithm

1. INTRODUCTIOnIn zinc hydro-metallurgical process) a large amoks of power is consumed in EDPZ everyyear [11. Therefore, reducing the power consumption of EDPZ is very important. The TSVP,involving higher price in rush hours while lower price in valleys, has been adopted since 1995.An unvaried supply in daily production is costly, so it is necessary to adopt an optimal powersupply scheme under the c..dition of ensuring the quantity and quality of products.Derived from the Metropolis …     

A new method for uniform local heating deep in body using ultrasound phased-array system

A new method for targeted heating of deep tissue was developed by using an ultrasound phased-array system which can generate various multiple foci patterns by electronically changing its amplitude or phase pattern. This method involves using a technique of combining switching and rotating of multiple foci patterns to create a uniform temperature over tissue volumes in various size. Using this method, the target tissue deep in the body can be heated to a specified temperature, which gives conditions for thermo-sensitive liposomes release. A simulation study for a 108-element, spherically sectioned array was performed to determine an optimal heating scheme from a set of multiple focus fields which were produced by inputting different combinations of phases and amplitudes. Comparisons of a static multiple foci field, the switched fields and the switched-rotated fields indicated that the technique of combining switching and rotating of multiple foci patterns has advantages of both lowering the peak temperature and evening the temperature distribution. The simulation results also show that the therapeutic heating zones in various size employing the combined method. These results offer significant data for designing thermotherapy equipment for tumor-specific drug release with thermo-sensitive liposomes.