Symbol error rate of selection amplify-and-forward relay systems

Cooperative diversity schemes significantly improve the performance of wireless networks by transmitting the same information through several nodes. The amplify-and-forward (AF) relaying method is one of the most attractive cooperative diversity schemes due to its low complexity. Selection AF relaying has recently been proven to achieve the same diversity order as and lower outage probability than all-participate relays. In this letter, we present an asymptotic analysis of the symbol error rates of a selection AF network, and compare it with the conventional all-participate scheme     

安徽省2004年度汽轮机叶片重大事故的原因分析及处理

对安徽省2004年度汽轮机叶片发生几次事故的原因分析，表明与叶片共振，加工、组装、银焊工艺等因素有关。     

营养型发酵软饮料的研究

研究利用稻加工大米的副产品碎米为主要原料 ,加入麦芽、加酶 ,进行液化、糖化、发酵等工艺 ,研制出一种发酵营养型软饮料。本产品与啤酒相比 ,可减少原料总用量的 17% ,减少麦芽用量的 2 8.6%。     

Flow Simulation and Optimization of Plasma Reactors for Coal Gasification

This paper reports a 3-d numerical simulation system to analyze the complicated flow in plasma reactors for coal gasification, which involve complex chemical reaction, two-phase flow and plasma effect. On the basis of analytic results, the distribution of the density, tempera-ture and components‘ concentration are obtained and a different plasma reactor configuration is proposed to optimize the flow parameters. The numerical simulation results show an improved conversion ratio of the coal gasification. Different kinds of chemical reaction models are used to simulate the complex flow inside the reactor. It can be concluded that the numerical simulation system can be very useful for the design and optimization of the plasma reactor.     

双BGO晶体能谱测井

Ｃ／Ｏ测井可以利用ＢＧＯ晶体探测效率高的特点，在其探测器部分放置两个探测器，称为双探测Ｃ／Ｏ测井仪，长短源距两个探头所测谱数据进行补偿，有效地去除了井眼条件的影响，提高了测量精度和油水差值，更加有产地分油水层，并有望能在低孔隙度的地层中使用Ｃ／Ｏ测井仪器。     

电缆截面积计算中如何确定电导系数

在煤炭企业电缆截面积选择计算当中，如何确定电导系数的大小，是一个不能忽视的问题。本文经过分析、计算、论证给出了较为合理、准确的结果，为供电设计中电缆截面积的选择计算提供了重要的依据     

添加晶种对硅酸盐水泥生料易烧性影响的研究

采用实验室制备不同种类单矿物，纯熟料及白水泥熟料为晶种，利用ＤＴＡ，ＸＲＤ及测定游离石灰等方法，研究了其对硅酸盐水泥生料易烧性的影响。结果表明；铁相的作用在四种单矿物中最为明显，其它三种主要矿物也均有不同程度地促进煅烧过程的熟料矿物形成的作用。     

闪烁体部分性能的测试方法

本文介绍了闪烁体相对光输出，相对能量转换效率，固有幅度分辨率，探测效率测试法及其温度效应。