用计算机确定离心泵变速调节的参数

通过对离心泵的性能曲线进行数学处理后，利用计算机确定出离心泵的变转速调节的各参数,并绘出调速后的性能曲线。     

人类基因组中L1元件及其5′UTR的研究

讨论了L1在人类染色体中的分布密度与染色体长度以及L1的密度与基因密度之间的关系.发现在大多数染色体上L1的密度和染色体的长度表现为正相关,而L1的密度和染色体中基因的密度表现为负相关;对人类L1的5′UTR进行了详细的研究后,发现在L1元件的5′UTR部分含有许多转录因子结合位点.对基因的转录起始位点上游进行统计分析,发现其中含有大量的L1序列.通过对人类的EST数据库进行BLAST分析,新发现了51条和人类L1 5′UTR相似性较高的EST片断,根据它们分布的组织特异性,说明L1元件可能调控与发育过程有关的基因的表达;最后应用多样性增量的方法对人类和大鼠的L1 5′UTR进行了区分,得到了较好的预测结果,说明大部分L1的5′UTR的调控作用是人类特有的.     

平台企业的进入、竞争与规制

基于经典的Salop模型,研究了定向广告情况下平台企业的进入、竞争与规制问题。研究发现：当广告定向精度较小（大）时,均衡广告量与平台的广告定向精度成反（正）比;与社会最优状态相比,当广告 定向精度较小（大）时,均衡的广告量过多（少）,而均衡平台数量是否过多既取决于平台的差异化程度,又取 决于平台的广告定向精度;如果政府只管控平台数量,那么,相对于社会最优而言,当广告定向精度较小（大） 时,平台的数量过多（少）;如果政瘠只管控广告量,广告量既可能大于也可能小于社会最优的广告量,最终結 果取决于平台的差异化程度及其广告定向精度。     

采煤机调高机构设计参数分析确定

针对采煤机调高机构截煤时的推进速度和推进力大小方向进行分析,给出了其主要参数的具体计算方法。这种方法克服以往用类比、估算和经验所带来的盲目性。     

Microstructures and nanostructures of high Andean Penaincisalia lycaenid butterfly scales (Lepidoptera: Lycaenidae): descriptions and interpretations

The scales of one high Andean eumaeine lycaenid butterfly species with pale dorsal coloration and four species with vivid dorsal colour were investigated using field emission scanning electron microscopy. The micro‐ and nanostructures are illustrated, described, measured, and interpreted. The vivid colours in the species are caused by a pepper‐pot nanostructure of Urania‐type scales. This nanostructure is a three‐dimensional lattice within the body of the individual scale. The scales of the non‐vivid orange species are lacking this nanostructure and the surfaces of their scales show high microstructure irregularities. This absence of vivid colour may be correlated with thermal regulation. The irregularity of the scale microstructures suggests a heavy environmental pressure on the populations sampled. Previously unknown structural variations of Urania‐type scales are also described. The existence of closed scale microcell structures, explained as an apomorphic character in the tribe Eumaeini, most probably evolved independently several times. It is hypothesized that scale micro‐ and nanostructure modifications develop syntopically within a population, which in turn can lead to rapid diversification.     

盐胁迫下酿酒酵母和鲁氏酵母渗透调节方式的对比与分析

酵母菌是耐盐的真核模式生物.为了研究酵母菌在不同盐胁迫条件下的渗透调节方式,本文以不同条件对酿酒酵母和鲁氏酵母进行盐胁迫处理,利用高碘酸钠—乙酰丙酮法及蒽酮-硫酸法分别对盐胁迫下酿酒酵母和鲁氏酵母产生的甘油和海藻糖含量进行了测定、分析与比较.结果表明,在不同盐胁迫条件下酿酒酵母和鲁氏酵母细胞内均迅速积累大量的甘油和海藻糖.盐胁迫下鲁氏酵母以甘油调节渗透平衡的能力高于酿酒酵母以甘油调节渗透平衡的能力,盐胁迫下酿酒酵母以海藻糖调节渗透平衡的能力高于鲁氏酵母的海藻糖渗透调节能力.     

Pathways for oxidative fuel provision to working muscles: Ecological consequences of maximal supply limitations

The study of metabolic fuel provision and its regulation has reached an exciting stage where specific molecular events can be correlated with parameters of the organism's ecology. This paper examines substrate supply pathways from storage sites to locomotory muscle mitochondria and discusses ecological implications of the limits for maximal flux through these pathways. The relative importance of the different oxidative fuels is shown to depend on aerobic capacity. Very aerobic, endurance-adapted animals such as long distance migrants favor the use of lipids and intramuscular fuels over carbohydrates and circulatory fuels. The hypothesis of functional co-adaptation between oxygen and metabolic fuel supply systems allows us to predict that the capacity of several biochemical processes should be scaled with maximal oxygen consumption. Key enzymes, transmembrane transporter proteins, glucose precursor supply and soluble fatty acid transport proteins must all be geared to support higher maximal glucose and fatty acid fluxes in aerobic than in sedentary species.     

市场经济下空车流调整问题

分析了现行空车调整方法存在的缺陷 ,提出以运输距离、运输时间、运输费用和换算当量为目标的空车流网络调整方法 ,以及在现行运行机制下改进空车流组织的建议 .进一步从理论上作了较深入的探讨 ,提出市场经济下空车运送机制的新概念和基本要求 .     

如何学好アクセント——介绍几种掌握日语アクセント的规律

长春长春白　晶长春如何学好アクセント——介绍几种掌握日语アクセント的规律@白晶$长春大学外国语学院!长春130022     

CRPED软件及其应用

阐述了在轧钢工艺剪切规程设计中所采用的工程概率优化设计方法及 CRPED软件。结合剪切生产实际情况 ,证明此方法的实用性和 CRPED的可操作性 ,对剪切规程进行工程概率优化设计可取得明显的经济效益。