基于模拟退火离散粒子群算法的测试点优化

针对复杂系统的测试点优化问题,提出一种基于模拟退火离散粒子群（SA-BPSO）算法的测试点优化算法。该算法利用模拟退火算法的概率突跳能力,克服了基本粒子群算法易陷入局部最优解的缺陷。阐述了该算法在系统测试点优化应用中的流程及关键步骤,并且理论分析了该算法的复杂度。仿真结果表明,该算法在计算时间和测试费用方面都优于遗传算法,能够应用于复杂系统的测试点优化。     

闸室沉井沉放施工技术

以上虞市东港排涝闸工程为例,介绍了闸室沉井在沉放过程中的施工技术和质量控制,以及在沉放过程中产生偏斜而采取的纠偏措施.     

星地激光链路中的光信号快速识别方法

依据图像传感器探测背景光的噪声情况,定义了光背景特征值,用其来描述星地链路光背景噪声对于卫星光通信的瞄准、捕获和跟踪的影响.在星地链路光背景噪声条件下,对光信号识别和捕获的影响进行了分析,同时,提出了捕获光点路径优化算法,根据此算法可以得到星地激光链路区域光背景噪声的特征规律,并阐述了光背景噪声情况下的光信号快速识别方法.经模拟实验分析表明:该算法能够在光背景噪声情况下对光信号进行快速识别和捕获,满足了图像实时处理要求,增强了图像处理系统的抗干扰能力,因此,对星地激光通信具有一定的参考意义.     

驱油剂产出高峰期三元复合驱采出液的油水分离特性和影响因素分析

对大庆油田2座接收和处理石油磺酸盐表面活性剂弱碱体系三元复合驱采出液的转油站和转油放水站的采出液集输和处理工艺参数、外输液的成分和相分离特性等进行了长期跟踪监测.驱油剂产出高峰期,2座站三元复合驱外输液游离水表面活性剂含量最大值为299mg/L,pH值最高为9.5,聚合物含量最大值为1147mg/L;新中302转油站和...     

大面山烤烟烟叶素质和烘烤特性研究

研究了5种不同烘烤素质鲜烟叶的物理特性指标、组织结构指标、防御性酶体系,5种初烤烟叶的物理特性指标。结果显示,不同烘烤素质鲜烟叶的物理特性指标间、组织结构指标间和防御性酶指标间均存在显著差异,并有很明显的规律性;初烤烟叶的物理特性指标间也存在显著差异。在不同烘烤素质鲜烟叶间,叶面灰暗烟叶烘烤特性差,初烤烟叶大多是糟片;叶面黄绿相间烟叶,烘烤特性较差,一般初烤烟叶为花片或糟片;相对正常烟叶具有典型成熟特征;卷曲烟叶的组织结构非常疏松,细胞间隙度较大,空腔多,叶肉细胞排列疏松。在不同烘烤素质初烤烟叶间,挂灰样内在质量较次;紧密样内在质量更次;疏松样质量较好;“和爱”烟叶质量一般。     

小区硬质景观施工中的问题及改进措施

根据施工后的使用状况分析存在于硬质景观施工中一些损坏性的问题,究其原因,并提出改进措施,为日后改进施工质量提供基础信息。     

Investigation on Sodium Benzoate Release from Poly(Butylene Adipate‐Co‐Terephthalate)/Organoclay/Sodium Benzoate Based Nanocomposite Film and Their Antimicrobial Activity

Polymeric nanocomposites embedded with nontoxic antimicrobial agents have recently gained potential industrial significance, mainly for their applicability to preserve food quality and ensure safety. In this study, a poly(butylene adipate‐co‐terephthalate) (PBAT)/organoclay (CMMT) based nanocomposite film doped with sodium benzoate (SB) as antimicrobial agent was prepared by a solution mixing process. A homogenous dispersion of organoclay (cetyltrimethylammonium‐modified montmorillonite [CMMT]) in PBAT matrix was observed by X‐ray diffraction and transmission electron microscopy. PBAT/CMMT nanocomposite film showed higher barrier properties against water and methanol vapor compared to the PBAT film. The release of SB from PBAT and its nanocomposite film was measured and the relevant data were fitted to the Weibull model. The higher values of Weibull's shape factor and scale parameter as corroborated by experimental findings indicated faster rate of SB release from PBAT/CMMT/SB nanocomposite film, when compared to the pristine PBAT film. Bacterial inhibition studies were accomplished against 2 food pathogenic bacteria, Bacillus subtilis and Staphylococcus aureus, by determining the zone of inhibition and corresponding growth profiles. Both bacterial inhibition studies and growth profiles established that PBAT/CMMT/SB demonstrated better antimicrobial activity than PBAT/SB film. Therefore, PBAT/CMMT/SB nanocomposite film can be used for food packaging application as it showed good barrier properties and antimicrobial activity against food pathogenic bacteria.     

瓦楞辊的表面强化工艺

研究了经渗氮、碳氮共渗后高频淬火处理后42CrMo及45钢瓦楞辊试样的表面组织和力学性能。结果表明,两种试样经渗氮加高频淬火处理后表层主要为氮化物和回火马氏体组织;碳氮共渗加高频淬火处理后试样表层组织主要为回火马氏体和有少量氮化物。45钢和42CrMo钢试样经过处理表面硬度分别达到740和800 HV0.1,经高频淬火处理后,试样表面硬化层有较好的硬度梯度。     

豆豉、纳豆及天培的研究进展

综述了豆豉、纳豆及天培的生产工艺、发展现状、营养功能等,比较了三者的相同点和不同点,并对其前景进行了分析和展望。