LNG燃气电站对福建电力影响初探

介绍了LNG燃气电站的优点,对LNG燃气电站的电价影响、优化电源结构和运行位置以及辅助服务进行初步探讨。     

Gaussian process assisted coevolutionary estimation of distribution algorithm for computationally expensive problems

In order to reduce the computation of complex problems, a new surrogate-assisted estimation of distribution algorithm with Gaussian process was proposed. Coevolution was used in dual populations which evolved in parallel. The search space was projected into multiple subspaces and searched by sub-populations. Also, the whole space was exploited by the other population which exchanges information with the sub-populations. In order to make the evolutionary course efficient, multivariate Gaussian model and Gaussian mixture model were used in both populations separately to estimate the distribution of individuals and reproduce new generations. For the surrogate model, Gaussian process was combined with the algorithm which predicted variance of the predictions. The results on six benchmark functions show that the new algorithm performs better than other surrogate-model based algorithms and the computation complexity is only 10% of the original estimation of distribution algorithm.     

考虑随机风影响的隧道通风量计算

现有隧道内通风量计算偏保守,往往需开启更多风机,导致能源浪费严重。本文提出一种考虑随机自然风影响下的隧道内通风量计算方法。将风频引入隧道通风量计算中,指出隧道内风频的两种表示方法,离散型风频分布和韦布尔风频分布,通过最小误差逼近算法计算韦布尔风频分布中的尺度系数A和形状系数K。通过算例可得,进口处考虑随机风比不考虑随机风的通风量多37.8%,说明考虑随机风影响可明显降低风机开启数量。     

基于PRONY模型的谐波检测

信号的去噪问题一直是信号检测的一大难题,而要检测的信号往往却存在不同的随机噪声。在分析周期信号的基础上,提出了一种基于PRONY模型的周期信号分析法。经过对周期短(窄)脉冲信号的实验,这种直接构造的PRONY算法在周期信号中能达到有效、准确的分析结果。     

对叔丁基杯[4]芳烃乙酸对铀(Ⅵ)的萃取研究

合成了对叔丁基杯「４」芳烃及其衍生物对叔丁基杯「４」芳烃乙酸,研究了对叔丁基杯「４」芳烃乙酸对铀酰离子的萃取。测定了不同酸度和不同萃取剂浓度对分配比的影响。确定其萃合物组成为ＵＯ２Ｈ２Ｌ。求出了萃取反应平衡常数,讨论了萃取机理。     

脑显像剂IMP的放射性碘标记及动物实验

文章报道了对本校合成的RS-N-Isopropyl-P-Iodoamphetamine进行~(125)I标记和动物实验的初步结果。我们采用水热法进行同位素交换反应,在Cu(II)和过量还原剂存在的条件下,可以方便地获得高标记率的~(125)I-IMP。经萃取纯化后,放化纯度>98%;游离~(125)I<1%。测定了在大鼠体内静脉注射~(125)I-IMP的分布,结果表明,~(125)I-IMP具有脑摄取率高、脑与血的比值大、在脑贮留时间长等优点,是一种有用的新型脑显象剂。     

基于模糊数学的低致敏营养餐包感官评价研究

以低致敏蛋白、微囊化油脂以及复合糖元为主要原料制备开发低致敏营养餐包。从粉体的颗粒特性、冲调特性和主客观感官特性等对餐包开展评价研究,利用模糊数学法对餐包冲调后的色泽、气味及滋味、组织状态进行感官评价;通过餐粉的均匀度、溶解稳定性、湿润性进行基本特性评定。结果表明：餐包粉体粒度分布与餐包冲调特性具有相关性,细粉颗粒（0~30 μm、0~50 μm、0~100 μm）与餐包冲调特性呈负相关性,与粗粉颗粒（200~500 μm）呈正相关性,即随细粉粉体颗粒体积不断增加,湿润时间不断增加,冲调特性逐渐变差;随粗粉粉体颗粒体积不断增加,湿润时间不断减少,则冲调特性不断加强。粉体粒径与餐包感官评分呈正向线性相关性,一定范围内,随粒径不断增大,感官评分不断加强,产品品质质量较好。该评价体系为完善低致敏营养包的加工工艺提供了理论依据。     

华龙一号汽轮发电机组考核试验方案优化分析

核电机组因其本身的特殊性更加强调机组的安全稳定运行,华龙一号作为我国拥有自主知识产权的第三代核电机组,因其本身的设计理念和监督体系与国内在役核电机组均有不同,故不能直接套用其他类型机组的试验方案。针对华龙一号全球首堆福清核电5号机组汽轮机考核试验方案展开讨论和优化分析,结合机组实际考核试验遇到的相关问题给出解决方案,为后续华龙一号及其他三代堆型核电机组提供良好的借鉴。     

冬虫夏草菌丝体水提物的抗新城疫病毒作用

通过低温水浸提取方法,获取冬虫夏草菌丝体水提物。采用MTT的方法和观察细胞病变（CPE）的方法分别研究了水提物毒性和抗病毒作用。结果显示水提物浓度≤0.5mg/mL时,对Vero细胞无毒性,0.5mg/mL水提物与新城疫病毒作用,或预处理Vero细胞,均能抑制新城疫病毒在细胞上病变的形成。提示水提物具有直接抗新城疫病毒和预防新城疫病毒感染的作用。     

Techniques for quickly changing fuel gas in continuous annealing furnaces

An increasing number of annealing furnaces have recently been using cheaper and cleaner natural gas(NG)instead of liquefied petroleum gas(LPG)as fuel gas.However,the fuel gas of the furnaces often needs to be changed when NG supply is not adequate or when LPG becomes cheaper.Usually,changing the fuel gas involves changing various equipment as well as control parameters for instruments and the control system and hence is time consuming.Therefore,it is important to develop aquick process for changing fuel gas.This study discusses the techniques for quickly changing fuel gas in an annealing furnace.These techniques deal with the design of the pipe, valve and burner,the selection of the flow meter and the flow control valve,the switch of the software and parameters for the control system,as well as the operation,commissioning and hot test of the furnace when the fuel gas is changed.Using these techniques,it is possible to change fuel gas in6 h.