Composition of sandstone and heavy minerals implies the provenance of Kuqa Depression in Jurassic, Tarim basin, China

The petrological characteristics and heavy mineral assembly of the Jurassic System in Kuqa Basin are consistent with the tectonic evolution, which is the major factor controlling the filling process of Kuqa Basin. Controlled by the source areas at the both sides of the Basin, the matrixes are dominated by sedimentary rock, high-grade metamorphic rock, acid magmatic rock, and the highest heavy mineral assemblage of zircon-garnet-magnetite in the content. According to heavy mineral indexes, the Jurassic strata can be classified into three rhythmic units of heavy mineral. The lower sequence contains abundant heavy minerals and relatively high content of detritus and its matrixes primarily came form the recycling orogen. The assemblage of “zircon-garnet-magnetite” indicates that the sedimentary area in the early evolution period of the basin is relatively near the provenance. The middle sequence is different from the lower sequence in the heavy mineral assemblage and has the different characteristics from that of source rock. The heavy mineral assemblage is “garnet-zircon” with the highest content of garnet and its main matrices are the high-grade metamorphic rock, acid magmatic rock and hydrothermal vein at the northeastern edge of the basin. The middle and upper sequences are characterized by the clast provenance, which is primarily from the recycling orogen at the northern edge of the basin and secondarily from the southern uplift. As a result of the two provenances, the strata with apparent changes of heavy mineral assemblage and index better coincides with the interfaces of the secondary strata sequences, which reflects the denudation history and the filling process of the orogen at the northern edge of the basin.     

构件软件的质量和度量

描述了构件技术的特点,介绍了度量的理论基础,并提出了一些关于构件软件的度量准则。     

纳米固体材料的屈服应力与微观结构的关系

研究了金属基纳米颗粒结构固体材料的屈服应力、显微硬度等力学性能及其与构成物质的颗粒度、界面微观结构之间的关系,并从理论上分析了规律产生的原因,为材料的设计提供科学依据。     

硅基铜膜应力随温度的变化及等温松弛

采用定点激光反射热循环方法 ,测量了硅基体上铜膜应力随温度的变化及等温松弛 .结果表明 ,开始加热时 ,应力随温度的增加以 - 2 6 2MPa ℃的速率线性减小 ,与弹性理论一致 ,压屈服强度与膜厚的倒数成正比 .在各种给定温度下 ,应力随时间均按负指数形式松弛 ,但应力松弛时间常数强烈地依赖于温度     

半相依回归系统参数的Stein型主成分改进估计

将S tein压缩思想与主成分改进估计相结合,研究两个半相依回归系统.当设计阵呈病态时,提出S tein型主成分改进估计,同时,给出当V未知时的两步估计.证明在均方误差意义下,S tein型主成分改进估计局部优于主成分改进估计和协方差改进估计.     

我国农作物遥感估产研究进展

概述了遥感在我国农作物长势监测、种植面积测算和产量估算等方面的应用和研究进展,同时分析了近来MODIS在农作物遥感估产方面的应用和存在的问题。展望了我国遥感估产的研究及发展方向,认为3S技术一体化、高光谱遥感、定量遥感是今后遥感估产应用的发展方向。     

烟丝可溶有机化合物分布与卷烟品质的研究

采用柱色层族组成分离方法,系统的研究了4种兰州烟烟丝中有机物分布特征,找出了不同档次兰州卷烟中系列有机化合物含量的差异,尤其是为吃味和香味做贡献的系列化合物相对丰度上的差异,提出了利用烟丝中可溶有机质含量的高低、利用烟丝中的生物碱的含量、利用样品的极性馏分、弱极性馏分在可溶有机质中的相对丰度作为判识卷烟内在品质以及检测卷烟优劣的方法.     

基于修正斜压场的RC框架边节点剪切性能分析

为研究钢筋屈服强度和混凝土抗压强度对钢筋混凝土(RC)框架边节点剪切性能的影响规律,基于修正斜压场理论(MCFT),对某框架边节点的剪切应力-应变骨架曲线进行数值模拟,并与试验结果进行对比.在验证MCFT算法的精度后,研究钢筋屈服强度和混凝土抗压强度两个参数变化对RC框架边节点剪切应力-应变骨架曲线和峰值剪切应力的影响规律.结果表明:基于MCFT可以较好地模拟RC框架边节点的剪切应力-应变关系曲线; RC框架边节点的峰值剪切应力对混凝土抗压强度的变化更为敏感,但当试件的钢筋(HRB400)屈服应力下降幅度超过16.45%时,对钢筋屈服应力的变化更为敏感;当试件的钢筋(HRB400)屈服应力下降幅度超过10%时,节点发生钢筋滑移破坏,此时峰值剪切应力会大幅下降.     

水稻OsNAP基因的功能分析及其在育种价值方面的研究

NAC转录因子是植物特异的转录因子.本研究通过从水稻日本晴(Oryza sativa L.)的基因组中克隆到一个与拟南芥衰老相关的基因AtNAP(Atlg69490)的同源基因OsNAP.OsNAP的ORF为1 179bp,推测其编码蛋白含有392个氨基酸,等电点为8.55,分子质量为42.195ku.为进一步研究OsNAP的功能,利用显性抑制元件SRDX构建其pCAMBIA1304-35S:OsNAP-SRDX表达载体,通过农杆菌浸染方法将其转化水稻中花11品种.T1代转基因植株通过潮霉素、RealtimePCR、和Western blot鉴定,筛选出4个OsNAP高表达的阳性植株.在种子成熟期,观察到T1代转基因4号植株较野生型相比有明显的延缓衰老的表型,其他农艺性状如单株分蘖数、单株总粒数、单穗饱和穗粒数、千粒重、结实率等都优于野生型.实验证明抑制OsNAP基因的表达能够延缓水稻叶片衰老并可以提高产量,具有潜在的育种价值.