用改进的多区模型计算柴油机中的燃烧和排放

在广安博之直喷式柴油机多区燃烧模型的基础上,改进了燃油雾滴的运动和蒸发模型,以及碳烟的生成与氧化模型,增加了缸内挤流和涡流模型、油滴碰壁和反弹模型,计算结果表明,改进后的油束运动模型比原模型更加合理,较好地解决了空气卷吸问题,在不同转速和负菏工况下均能获得令人满意的精度,能够反映缸内与各区内的燃烧与排放物生成情况,用改进的多区模型可以较好地研究直喷式柴油机的工作过程及其排放。     

渗透胁迫和外源ABA对旱生植物梭梭幼苗某些生理性状的影响

梭梭幼苗在H氏平衡溶液中培养至第4天时,其细胞膜透性、可溶性糖和脯氨酸含量均出现明显的转折变化;甘露醇溶液渗透胁迫引起幼苗的细胞膜电解质渗漏率下降,脯氨酸含量大幅度升高,可溶性糖含量则呈现交替变化;外源ABA则以对上生理指标有不同的影响。因此其作用机制可能与渗透胁迫无直接的相关性。     

杯芳烃对Fe~(3 )离子的液膜传输研究

本文用气泡式准乳化液膜法研究了对叔丁基杯芳烃及其衍生物对Fe3 离子的液膜传输作用 ,并对其传输规律、影响因素 (源相及吸收相的酸度 ,金属离子的浓度 ,传输载体类型等 )及传输机理作了初步探讨 .     

二分单纯形算法中子规划的改进

二分单纯形算法中,线性规划问题的最优解是通过求解一系列子问题来实现的,本文针对二分单纯形算法中的子规划问题作进一步研究,提出了一个新的了规划问题来改善问题的不可行性,并确定出了相应的主元旋转规则,给出了相应的子算法,同时进行了数值实验,实验结果表明,调用新子算的二分法与原始二分法相比,迭代次数和计算时间均有所改善,可视为原始二分算法的一种改进算法。     

Interplay of magnetism and high-Tc superconductivity at individual Ni impurity atoms in Bi2Sr2CaCu2O8+delta.

Magnetic interactions and magnetic impurities are destructive to superconductivity in conventional superconductors. By contrast, in some unconventional macroscopic quantum systems (such as superfluid 3He and superconducting UGe2), the superconductivity (or superfluidity) is actually mediated by magnetic interactions. A magnetic mechanism has also been proposed for high-temperature superconductivity. Within this context, the fact that magnetic Ni impurity atoms have a weaker effect on superconductivity than non-magnetic Zn atoms in the high-Tc superconductors has been put forward as evidence supporting a magnetic mechanism. Here we use scanning tunnelling microscopy to determine directly the influence of individual Ni atoms on the local electronic structure of Bi2Sr2CaCu2O8+delta. At each Ni site we observe two d-wave impurity states of apparently opposite spin polarization, whose existence indicates that Ni retains a magnetic moment in the superconducting state. However, analysis of the impurity-state energies shows that quasiparticle scattering at Ni is predominantly non-magnetic. Furthermore, we show that the superconducting energy gap and correlations are unimpaired at Ni. This is in strong contrast to the effects of non-magnetic Zn impurities, which locally destroy superconductivity. These results are consistent with predictions for impurity atom phenomena derived from a magnetic mechanism.     

四川省森林旅游资源可持续发展对策探讨

本文分析了森林旅游的发展历史、作用和四川省森林旅游资源的概况、存在问题 ,并探讨了其持续发展的原则与对策     

Empirical Analysis of Manufacturing Competence in Chinese State-Owned Enterprises

During the past ten years,most of Chinese State-owned enterprises have already entered market economic system and faced very serious competitive environment.In this paper,we use data from the 1997 Manufacturing Future Survey(MFS)conducted in China to observe manufacturing strategies that some Chinese State-owned enter-prises use to improve their competitiveness.The competitor which Chinese manufacturing firms face is first analyzed in the paper.From two to four parts of the paper,     

激光诱变对洋葱须根的生物学效应研究

采用 CO_2激光和 He-Ne 激光辐射洋葱两个品种的湿种子,采用随机区组设计,重复3次,利用生物统计学和生理生化的方法,从个体及生化水平上考查激光诱变洋葱 L_1代须根的生物学效应,结果表明:在须根长、须根数、须根重、须根活力等方面,表现为不同处理引起的生物学效应差异,激光种类不同,须根长的变异达到5%的显著差异,激光剂量不同引起须根数变异达5%的显著水平,激光辐射对洋葱根系活力表现刺激效应,可作为激光诱变洋葱育种参考。     

色漆配色仪的研制

介绍了一种用三刺激值区配色漆电脑配色仪,给出了配色原理,配色系统的结构以及一组配色的实例数据。     

地区级城市环境管理信息系统的设计

遵循一般ＭＩＳ系统设计的原理,着重针对区域环境管理的业务体系,充分利用ＧＩＳ与一般ＭＩＳ的特点,提出了在大型网环境下,地区级城市环保管理信息系统设计的概念,分析了系统应具备的主要模块,分析功能,软硬件的配置状况及数据库建立的过程,以大连市为例,建立了一套适用于地区级城市的环境管理信息系统。