周期信号的孔径抖动及其去除

孔径抖动是指模数转换器采样周期之间出现的相位抖动 ,是由各时钟周期边沿出现时刻的不确定性导致的。当输入信号频率较高时孔径抖动是模数转换器信噪比下降的一个重要原因。对数据采集系统中的孔径抖动进行了仿真实验 ,介绍了反卷积算法 ,并利用反卷积算法对周期信号的孔径抖动进行了去除。仿真结果表明该方法是有效可行的     

基于资源约束的项目区域风险回应策略选择研究

根据项目区域风险的特点，从资源约束的角度建立项目区域风险回应策略选择模型，并利用动态规划设计出该模型的分步解法，较为全面科学地得出最优方案。最后，用一个算例说明方法的可行性和有效性。     

NSRL-XAFS光束线弧矢聚焦双晶单色器设计

针对XAFS光束线能量动态扫描的实验特点，介绍了弧矢聚焦双晶单色器的物理设计：包括晶体光学结构、性能参数计算、晶体热载分析和弧矢弯曲原理．弧矢缩比选择为1：4．88，水平接收角由原来的1mrad拓宽到3mrad，在不改变基本配置的情况下，获得了样品上束癍缩小、光子通量高达半个量级以上的增益．     

Variation in FTO contributes to childhood obesity and severe adult obesity

We identified a set of SNPs in the first intron of the FTO (fat mass and obesity associated) gene on chromosome 16q12.2 that is consistently strongly associated with early-onset and severe obesity in both adults and children of European ancestry with an experiment-wise P value of 1.67 x 10(-26) in 2,900 affected individuals and 5,100 controls. The at-risk haplotype yields a proportion of attributable risk of 22% for common obesity. We conclude that FTO contributes to human obesity and hence may be a target for subsequent functional analyses.     

伊辛模型临界自关联函数的Monte Carlo模拟

采用动力学Monte Carlo模拟方法,在非平衡态临界点上,对二维伊辛（Ising）模型的自关联函数进行了数值研究.在零外场条件下,系统从高温无序初态淬火到临界点Tc,用热浴迭代算法,研究非平衡态下双时自关联函数A（t,t′）随时间的演化规律.在充分分析讨论有限尺寸效应发生的尺度范围之后,对模拟数据进行合理取舍,得到自关联函数在临界点的幂指数λc/Zc≈0.7.实验表明这个值与所选取的参考时间无关,证实短时动力学在临界区域存在普适的标度律.     

一个连续数方程

用初等方法证明了：当ｎ，正为正整数，ｓ为非负整数，ｇ＝８０ｓ＋２５，丢备图方程无整数解     

新闻表现形式创新初探

根据自身实践经验,参考中央和各地、市及国外电视新闻,提出在新闻表现形式上的创新形式,具有一定的指导性和可操作性。     

一种改进的实信号IFFT算法

由于重量轻、体积小、功耗低、功能强的小卫星工作在无人干预的低温 ,高辐射的空间环境中 ,因此星上计算机系统必须满足集成度高、寿命长、可靠性高、抗辐射能力强的要求。针对立体测绘小卫星的特点 ,我们设计了满足上述要求的集集中控制与分布控制优点于一身的星上计算机系统 ,对其可靠性进行了分析 ,并对提高其可靠性应采取的关键技术进行了简要的论述。     

实验性脾虚证大鼠血清中微量元素含量的研究

用破气苦降药加饮食失节法复制了大鼠脾虚证模型。采用原子吸收光谱法检测了血清发Ｚｎ、Ｃｕ和Ｆｅ的含量。本研究证明，脾虚证大鼠血清Ｚｎ值明显降低（Ｐ＜０．００１）；Ｃｕ值、Ｆｅ值无明显差异（Ｐ＞００５）；Ｃｕ／Ｚｎ比值上升。用中药加味四君子汤治疗后，血清Ｚｎ值明显回升并高于正常水平（Ｐ＜００５），Ｃｕ值回升（Ｐ＜０．０５），但Ｆｅ值和Ｃｕ／Ｚｎ比值与自然恢复及对照组比较无显著性差异。这说明：１．脾虚组Ｚｎ的降低可能与消化吸收障碍有关；２．加味四君子汤对脾虚证时血清Ｚｎ及Ｃｕ／Ｚｎ比值的变化有明显的调整和恢复作用．     

Liquid-Liquid Equilibrium for 1-Butanol-Water-KF and 1-Butanol-Water-K2CO3 Systems

KF or K2CO3 was added into the 1-butanol-water system and two phases were formed： water-rich phase （water phase） and 1-butanol-rich phase （1-butanol phase）. The liquid liquid equilibrium （LLE） data for 1-butanol-water-KF and 1-butanol-water-K2CO3 systems were measured at 25℃ and showed that 1-butanol phase contained negligible salt and water phase contained negligible 1-butanol when the concentrations of KF and K2CO3 in the water phase were equal to or higher than 27.11% and 31.68% , respectively. Thus water could be separated efficiently from 1-butanol-water by adding KF or K2CO3 into the system. A theoretical calculation of LLE data was calculated by using the Pitzer theory to get water activity in the water phase, and by the models, such as the Wilson, NRTL or the UNIQUAC for the 1-butanol phase. For 1-hutanol-water-KF system, the experimental data were found in good agreement with the calculated results by using Pitzer theory and Wilson equa tion, while for 1-butanol-water-K2CO3 system, the experimental data were found in good agreement with the calculated results by using Pitzer theory and UNIQUAC eauation.