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Search Results: 1 - 10 of 44931 matches for " 卢任之 "
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THE ANALYSIS LOF ELECTROPHORETIC PROPERTIES OF A PHAGE HIND III DNA FRAGMENTS IN AGAROSE GELS: IONIC EFFECT AND OTHERS
λDNA/HindⅢ片段在凝胶中的电泳性质分析:离子效应及其它

李安,,晓丹
生物物理学报 , 1991,
Abstract: 本文以λDN/HinaⅢ片段(2.0kbp至23.1kbp)为材料,研究在各价态金属离子作用下DNA片段在凝胶中电泳迁移率的变化规律.离子效应使DNA聚合链的挠性增大,末端距与持久长度减小,从而使电泳迁移率随离子强度的增加而减小;同时这种离子效应又是价态依赖的.DNA电泳行为的离子效应与Hervet关于DNA聚合键在凝胶中的电泳理论模型分析一致.同时尝试应用现代多聚电解质理论对电泳离子效应的半定量分析也得到了满意的结果.本文还对凝胶浓度、电场强度、以及分子量诸因素对DNA电泳性质的影响进行了实验研究与讨论.
采用NSGA-II算法的混合动力能量管理控制 多目标优化方法
A Multi??Objective Optimization Method for Energy Management Control of Hybrid Electric Vehicles Using NSGA??II Algorithm

邓涛,林椿松,李亚南,
- , 2015, DOI: 10.7652/xjtuxb201510023
Abstract: 综合考虑燃油经济性、排放性与驾驶性对混合动力能量管理控制优化的优点,以某款并联混合动力汽车为研究对象,选取能量管理控制参数与传动系参数作为待优化参数,以动力性作为约束条件,建立混合动力能量管理控制多目标优化评价方法,提出基于NSGA??II算法的混合动力系统多目标优化方法,并与优化前控制策略进行仿真对比分析。结果表明:在满足基本约束的前提下,优化后燃油经济性最多提高了7.8%,平均提高了6.38%;驾驶性性能指标最多提高了27??12%,平均提高了21.74%;排放性综合指标平均提高了41.51%。提出的多目标优化算法具有良好的收敛性与分布性,得到的Pareto最优解集能够给混合动力能量管理控制策略提供更多的权衡选择方案,体现了多目标优化的优势。
A multi??objective optimization evaluation method for hybrid electric vehicle (HEV) is proposed by comprehensively considering the influences of fuel economy, emission and drivability on the energy management control for HEV. The multi??objective optimization algorithm based on NSGA??II (non??dominated sorting genetic algorithm??II) is established by setting the parameters of the energy management control and the driveline system as the optimal parameters for the parallel hybrid electric vehicles, and the dynamic performance as the constraint condition. Then the proposed method is comparatively analyzed with the traditional control strategy that only considers the fuel economy. Simulation results show that the maximum fuel economy performance increases by 7.8% and the average value increases by 6.38%; the maximum drivability performance increases by 42.28% and the average value increases by 21??74%; the average synthetic emission performance increases by 41.51%. The proposed multi??objective optimization algorithm has good convergence and distribution. The obtained Pareto optimum solutions may provide more trade??off options for HEV energy management control strategy, which reflect the advantages of multi??objective optimization
HEV传动系统多目标优化研究
Research on Multi-objectives Optimization of HEV Transmission System

邓涛,林椿松,李亚南,
- , 2016,
Abstract: 针对当前混合动力研究主要集中在燃油经济性等单目标上,对多目标研究较少的情况,提出一种基于非支配排序的多目标优化算法(multi-objective evolutionary algorithm,MOEA)。以装备5档手动变速器的并联混合动力汽车为对象,研究传动系速比匹配对燃油经济性与排放性的影响。结果表明:相比优化前,优化后燃油经济性提升了3.09%,排放性综合指标提升17.92%;得到的Pareto解集具有良好的分布性与收敛性,不仅优化了目标,更体现出目标间的冲突情况,说明提出的多目标优化算法能够体现混合动力多目标优化的本质;对解集进一步挖掘,理论上能搜寻到的全局最优解集,为混合动力多目标权衡控制策略提供了理想的控制基础。
At present HEV(Hybrid Electric Vehicle) research mainly focuses on the single object such as fuel economy, but little for multi-objectives. Taking the parallel HEV with 5 gears manual transmission as the research object, a multi-objectives evolutionary algorithm (MOEA) based on non-dominated sorting is proposed, which can analyze the influence of transmission ratio match on the fuel economy and emissions. The simulation results show that fuel economy increases by 3.09% and the emission performance comprehensive index increases by 17.92% compared with the pre-optimization results, which improves the effect of energy conservation. Moreover, the obtained Pareto solution sets have good distribution and convergence, which not only optimizes the objectives, but also reflects the conflict conditions among the objectives. The results show that the proposed MOEA can embody the essence of multi-objectives optimization for HEV. The overall optimal solution set, which can be searched theoretically, provides the ideal control basis for HEV multi-objectives trade-off control strategy
H~-之吸收系数

物理学报 , 1936,
Abstract: 本文根据波动力学计算H~-之吸收系数若H~-吸收较短於λ=17254A光线时,吾人应得一极宽连续光谱。依本文极简单计算,其系数大都在10~(-17)cm~2附近
水中填土坝孔隙压力的计算模型、解析方法与参数选取

岩石工程学报 , 1983,
Abstract: 根据水中填土坝运用期坝体密度变化具有泡胀性的特点,以及对库水位降落期孔隙压力实测资料的分析,笔者认为水中填土坝在库水位降落期的孔隙压力计算应采用考虑骨架变形的比奥(biot)固结理论模型。本文根据原型观测资料,对影响计算成果的三个主要力学指标:抗滑系数k,固结系数cv和有效当量剪阻角(?)'s,推荐了经验公式。并提出了简化有效应力法——二维压密近似解。
关于中国教育管理的一些问题

科技导报 , 1986,
Abstract: 我在最近十三年内在中国参观了许多大学,和大学里的许多负责人及教授们谈到大学里的管理情形,这种情形在全国大学里似乎有千篇一律的现象。大家异口同声地说,中国每一大学自成一个社会,结果是一个大学在本校的范围内办一个单独的社会。
怀念叶企孙老师

物理 , 1992,
Abstract: ?叶企孙先生于1921年在哈佛大学w,du-ane教授指导下测定普朗克常数值h,测得的h值为6.556±0.009×10-27尔格·秒[1986年标准h值为6.6260755(40)×10-27尔格·秒].其后叶先生在p.w.bridgman教授指导下做博士论文2),论文题目是“theeffectofhyd-rostaticpressureonthemagneticpermeabi-lity?...
离心式喷嘴工况理论分析

推进技术 , 1996,
Abstract: 对离心式喷嘴的最大流量原理进行了证明,并求得了该原理成立的边界条件。分析了离心式喷嘴的工况,结果表明,当喷嘴压降等于或大于临界截面处平均余区的1.5倍时,其工况处于临界或超临界状态。导出了波沿离心式喷嘴中液体自由表面的传播速度及其频率的计算公式,从中可以看出,波的传播速度及其频率取决于喷嘴压降及喷嘴的几何特性。
近代大型液体火箭发动机的特点

推进技术 , 1991,
Abstract: 本文对近代大型液体火箭发动机的特点进行了综述和分析.文中指出:使用高能、无毒的液氧、煤油和液氧、液氢为大型液体火箭发动机的推进剂势在必行;采用高压补燃循环系统可以明显提高发动机的比冲、减小发动机尺寸和质量;采用推进剂利用系统可以减少推进剂的剩余量,以提高运载火箭的有效载荷;使用辅助增压泵可降低贮箱压力,并提高发动机主泵的入口压力,以保证主泵在没有汽蚀的条件下可靠工作;高可靠性、长寿命和重复使用对航天产品尤为重要.
矿用钢绳芯带式输送机实时工况监测与故障诊断技术
黄民,
煤炭学报 , 2005,
Abstract: 对钢绳芯带式输送机接头断裂、纵向撕带、火灾、张力超限等常见重大事故的起因及工况条件进行了深入的调研和分析,并对目前出现的各类监测与诊断方法以及它们的优缺点和可行性进行了系统全面的介绍和分析.
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