Model of Markov Chains in Space-Time Random Environments

A general framework of stochastic model for a Markov chain in a space-time random environment is introduced, here the environment ξ^＊：={ξ1,x∈N,x∈ X}is a random field. We study the dependence relations between the environment and the original chain, especially the ＂feedback＂. Some equivalence theorems and law of large numbers are obtained.     

论施工支洞塌方段处理措施——以江苏溧阳抽水蓄能电站为例

文章主要对江苏溧阳抽水蓄能电站8#施工支洞0＋525.5 m-0＋528.5 m段塌方处理措施进行综述,可推广到其他相关隧洞塌方处理,并提供技术参考。     

铝碱化剂在高铝多元盐混凝剂生产中的作用

介绍了铝碱化剂及其作用．铝碱化剂能提高活性铝矾土的酸溶一水解特性值，如反应液的pH值从2．5提高到≥4．0，碱化度从50％提高到≥80％，主体碱式铝（以Al2O33％计）含量从6％提高到≥10％．也能提高铝酸钙粉的酸溶-水解特性值，如反应液的pH值从2．8提高到〉14．0，碱化度从55％提高到1〉80％，主体碱式铝（以鸽q％计）含量从6％提高到≥10％．     

二次免疫后家猫抗体形成细胞发育分化的免疫组织化学研究

用辣根过氧化物酶（HRP）作为抗原，与福氏佐剂一起对家猫进行二次免疫，追踪淋巴结中抗体形成细胞的发育和分化，并与已建立的细胞发育动力学模型进行分析比较，二次免疫后2－3d，淋纠结的皮、髓两区同时出现阳性反应细胞，免疫后7－9d两区阳性细胞连成一片，数量达到高峰，随后两区阳性细胞数下降，早期阳性细胞以淋巴细胞为主，高峰期则以前浆细胞和浆细胞为主，且各种类型细胞均匀分布，抗体形成细胞的形态学结果与已建立的数量模型和变异系数模型极为相符。     

饮用水中有机氯化物高级氧化工艺去除特点及机理分析

采用O3,UV,UV/空气和UV/O3工艺对三氯甲烷和氯苯2种重要氯化物的去除效果进行了比较,并就UV/O3工艺对2种有机物去除机理展开分析.试验90 min时,UV(253.7 nm)工艺氯苯分解产物氯离子浓度为2.03 mg/L,UV(253.7 nm)/O3工艺为1.80 mg/L,150 min时二者分别为2....     

Coordinated multipoint transmission and reception based on multicarrier time division multiple access

Coordinated multipoint ( CoMP) transmission and reception is a technique to reduce intercell interference and increase the cell edge throughput. In order to get maximum CoMP gain the networks and terminals involved in CoMP communication should be robust against time and frequency offset due to asynchronism between terminals and base stations. However, the modulation techniques proposed in LTE-Advanced standard (SC-FDMA and OFDM A) are quite sensitive to frequency offset because of DFT/IDFT used in the modulation systems, which brings difficulties for commercial implementation of CoMP technique based on LTE-Advanced. To relax the synchronization requirement in CoMP system, in this paper we introduce a CoMP technique based on a new multicarrier modulation scheme-multicarrier time division multiple access (MC-TDMA). In comparison with SC-FDMA and OFDMA, the MC-TDMA modulation can significantly improve the CoMP performance in case of carrier frequency offset. Simulation shows that at 20% of carrier frequency offset the CoMP system with MC-TDMA modulation can also keep high performance, while the system with SC-FDMA and OFDMA is totally lost in work.     

柴油机气道进气流动特性及进气门杆形状对其影响分析

建立某RD190柴油机螺旋进气道稳态CFD模拟计算模型,对其流动特性进行研究,分析得到了气道流量系数和涡流比、柴油机的外特性结果,并采用CFD模拟分析了进气门杆形状对进气流动的影响.研究结果表明:随着截面比的增加,平均流量系数和平均涡流比均为先增大后减小,当截面比在0.28~0.30时,进气道平均流量系数相对原方案值变化不大,而平均涡流比最大增加了9.98%.     

牛蛙系列肉制品加工研究

在对牛蛙肉制品加工特性进行详细探讨的基础上,研制出麻辣蛙丁、五香蛙干和五香烤蛙三种系列牛蛙肉制品,确定了牛蛙系列肉制品加工工艺流程、操作要点及相关工艺参数,并对产品的营养成分、理化及卫生指标等进行了测定和检验.     

钉道对股骨力学性能影响的研究

为了探究股骨粗隆间骨折愈合后,钉道对股骨力学性能的影响,分别建立了正常股骨和带钉道的股骨上段有限元模型,模拟正常步态中单腿站立相时股骨的受力情况,从强度和刚度两方面进行评价.研究表明,钉道对股骨刚度影响不大,但降低了股骨的强度,尤其是对患有骨质疏松症的老年患者.     

宽带无线通信中的滤波器组多载波技术

滤波器组多载波技术抗多径衰落能力很强,能够平衡高速传输与均衡接收复杂度二者之间的矛盾,是未来宽带无线通信的发展方向之一.从已获广泛应用的正交频分复用技术出发,简述滤波器组多载波传输技术基本原理及框图,给出现存问题.在此基础上总结它们与多输入多输出、码分多址以及认知无线电系统的技术融合,并对滤波器组多载波技术发展做出展望.