SGA3722矿用汽车的研制、改进及创新

北京首钢重型汽车制造厂结合国外先进矿车的结构形式,研制、生产了SGA3722型矿用汽车。自定型鉴定以来,对其发动机及相关总成、后悬架系统、驾驶室等方面进行了多项改进和创新,该车具有生产效率高、故障率低、消耗少、维修方便、舒适性良好等优点,应用表明,它是符合我国国情的40吨级矿车,具有广阔的市场前景。     

黄酮对刺葡萄花色苷辅色稳定化效果的研究

研究了几种黄酮类物质对刺葡萄花色苷的辅色作用,并研究了槲皮素、黄芩素和芦丁对刺葡萄花色苷热稳定性的影响。结果表明:槲皮素对刺葡萄花色苷的辅色效果最为显著（p<0.05）,其次是黄芩素和芦丁,浓度为0.1 mmol·L-1时单位浓度辅色效果最佳;槲皮素和黄芩素辅色时,在p H2.0处,辅色效果最好,而芦丁辅色时,最佳p H为3.0。加入槲皮素、黄芩素、芦丁后,刺葡萄花色苷的降解速率常数（k）皆显著小于对照组,半衰期（t1/2）均显著高于对照组（p<0.05）。经槲皮素、黄芩素、芦丁辅色后刺葡萄花色苷的活化能（Ea）分别为88.48、91.67、83.62 k J/mol,显著（p<0.05）高于对照组的74.51 k J/mol,说明加入槲皮素、黄芩素、芦丁能提高刺葡萄花色苷的热稳定性。      

Molecular Pathways of Cellular Senescence and Placental Aging in Late Fetal Growth Restriction and Stillbirth

Abnormally accelerated, premature placental senescence plays a crucial role in the genesis of pregnancy pathologies. Abnormal growth in the third trimester can present as small for gestational age fetuses or fetal growth restriction. One differs from the other by the presence of signs of placental insufficiency and the risk of stillbirth. The majority of stillbirths occur in normally grown fetuses and are classified as “unexplained”, which often leads to conclusions that they were unpreventable. The main characteristic of aging is a gradual decline in the function of cells, tissues, and organs. These changes result in the accumulation of senescent cells in mitotic tissues. These cells begin the aging process that disrupts tissues’ normal functions by affecting neighboring cells, degrading the extracellular matrix, and reducing tissues’ regeneration capacity. Different degrees of abnormal placentation result in the severity of fetal growth restriction and its sequelae, including fetal death. This review aims to present the current knowledge and identify future research directions to understand better placental aging in late fetal growth restriction and unexplained stillbirth. We hypothesized that the final diagnosis of placental insufficiency can be made only using markers of placental senescence.     

MS休眠窗口叠加增长算法及其性能分析

针对休眠窗口的大小会影响移动站点节能性能及接收数据帧平均响应时间的问题,提出一种叠加增长算法,从而达到较好的节能效果且具有较短的平均响应时间。该算法定义第K个休眠窗口长度是第K．1和K-2个休眠窗口长度之和,以减缓各休眠周期内休眠窗口增长的速度。仿真结果表明,该算法在平均能耗和平均响应时间方面均优于IEEE802 16e规定的指数增长算法。     

SGA软件在可控震源施工中的应用

SGA软件是法国SERCEL公司开发的一个信号图形分析软件,可以方便地对可控震源的控制信号和震源状态信号进行实时分析和监控,进而对野外资料实行质量控制,杜绝出现质量事故。     

DNA computing based RNA genetic algorithm with applications in parameter estimation of chemical engineering processes

Based on RNA genetic operations and DNA sequence model under selection and mutation, an electronic RNA genetic algorithm (RNA-GA) with improved crossover and mutation operator is proposed. The proposed algorithm can be implemented on real biochemical reaction after simple transition, thus, the brute force method of DNA computing can be broken. The convergence analysis of the proposed algorithm shows that RNA-GA with elitist strategy can converge in probability to the global optimum. Comparisons of RNA-GA with standard genetic algorithm (SGA) for typical test functions show the advantages and efficiency of the proposed algorithm. As illustrations, the RNA-GA is implemented on parameter estimation of a heavy oil thermal cracking 3-lumping model and a fluid catalytic cracking unit (FCCU) main fractionator. In both cases, it is shown that the methodology is effective in parameter estimation of chemical processes.     

遗传算法中交叉操作研究及应用

系统的分析了遗传算法中交叉操作，得出如下结论：遗传算法中交叉操作的实质是子代个体为父代个体在小范围内进行大概率变异的结果，该范围由双亲个体分别进行与，或操作所得到的两个体决定。对该结论做出了理论证明，同时基于此思想提出了一种不含选择和变异操作的新式遗传算法Crossover GA(CGA)。将其应用到具体实例中并和几咱典型的遗传算法进行了比较，发现其性能优与同类其它算法。     

改进适应度函数的遗传算法

提出了一类新的改进的适应度函数的遗传算法,考虑了函数在搜索点的函数值及其变化率,结果表明收敛速度明显高于标准遗传算法.     

基于蛛网结构的改进遗传算法研究

针对遗传算法对搜索空间变化的适应能力差,提出一种改进的遗传算法。根据蜘蛛在蜘蛛网上快速抓捕猎物的行为进行深入研究,并将其与GA模型相结合。通过改进遗传算法的初始化方式和适应度的评估方式,增强遗传算法对搜索空间变化的适应能力。对复杂函数的寻优实验验证改进后的遗传算法的有效性,并通过与传统SGA的实际计算结果相对比,更进一步说明算法的改进效果。     

遗传算法在求解多目标约束优化问题的编程实现

SGA是一种随机全局搜索的优化方法,基于通常的最优化问题都含有多个目标和约束条件,本文论述了处理这两个问题的方法并编程实现了求解多目标约束优化的遗传算法。