用红外和X射线衍射技术研究炭分子筛

The results of the infrared analysis and the X-ray diffraction examination on carbon molecular sieves used for air separation are presented. An improved procedure for the production of carbon Sieve from coal is proposed.     

从几个次序统计量出发的二参数Weibull分布的参数估计

从两个或三个次序统计量出发，讨论了二参数Weibull分布的参数估计问题，在实际数据的缺失、删失、截尾等情况下，为可靠性试验的数据处理提供了一种有效的估计方法．     

基于时间衰减的分布式数据流聚类算法

为了发现分布式数据流环境下的微簇,针对数据流的遗忘特性,提出一种基于时间衰减的数据流聚类算法.根据衰减模型增量式的处理局部站点,将局部模型发送给中心站点.中心站点对局部站点的微簇进行合并,生成全局聚类模型.通过真实数据和仿真数据的实验表明,该算法能够得到较好的聚类质量,并且有较好的伸缩性.     

山西省粮食亩产类型的灰色评估与分析

本文应用多指标灰色评估方法,对粮食亩产类型进行了研究与划分,较单一指标分类更能客观地反映各地区粮食生产的实际情况。并以山西省为例计算取得了较好的效果,为山西省中低产田的划分提供了科学依据。     

圆口喷射器湍流流场数学模型及其最优设计

本文根据湍流射流和湍流边界层理论对圆喷嘴喷射器混合段湍流流场进行了研究,应用雷诺方程推导出喷射器混合段的基本方程和动量积分方程,用数学模型研究了喷射燃烧器,并对喷射器提出了一套最优设计公式。     

系列芳基烷基不对称亚砜硝酸铀酰配合物的合成及研究

本文合成了一系列烷基芳基不对称亚砜Ｒ１－Ｃ６Ｈ４－ＳＯ－Ｒ２（Ｒ１＝ＣＨ３，Ｃ（ＣＨ３）３；Ｒ２＝Ｃ２Ｈ５，Ｃ４Ｈ９，Ｃ６Ｈ１３，ＣＨ２ＣＨ（Ｃ２Ｈ５）Ｃ４Ｈ９），并且以之为配体（Ｌ）和硝酸铀酰反应，制备了一系列硝酸铀酰配合物ＵＯ２Ｌ２（ＮＯ３）２，通过元素分析、摩尔电导、红外光谱，研究了配合物的组成、结构和性质，并测定了配合物［ＵＯ２（ＴＢＳＯ）２（ＮＯ３）２］的晶体结构。     

富锗煤烟灰中的锗含量测定

建立了湿法消解-电感耦合等离子发射光谱法(ICP-AES)测定富锗煤烟灰中锗含量的方法,研究了样品预处理、进样系统、光谱干扰、等离子体测定条件对测定结果的影响.在优化实验条件下,方法的相对标准偏差0.79%,加标回收率98.55%~105.85%,表明该方法具有较好的准确度和精密度.     

基于SCADA和GIS技术的市政管网管理系统

根据市政管网的特点和管理部门的需求,开发一套可监控和管理市政管网的管理系统.本系统以GIS、SCADA和数据库技术为基础,将GIS应用平台和SCADA系统高度集成,实现了空间数据和实时数据的一体化管理.基于ArcGIS的GIS平台与SCADA技术相结合,可对市政管网进行动态监控和集中管理,为市政管网的安全运行和预警、防灾、减灾提供强有力的保障.     

Studies on biomechanics of skeletal muscle based on the working mechanism of myosin motors: An overview

Skeletal muscle is the source of human body motion.Many scholars have been studying in this field to reveal its contraction mechanism,and relevant achievements have been awarded the Nobel Prize.This paper reviewed the current researches on biomechanics of skeletal muscle,and concluded two strategies(top-down and bottom-up methods) for the biomechanical research of skeletal muscle.Moreover,this paper generalized two major aspects of muscle research:(1) the multi-force coupling mechanism and the collective operation mechanism of molecular motors;(2) the bioelectrochemical driving and control principium of muscle contraction.We discussed the solution for experimental verification and induced a novel idea to study the biomechanics of skeletal muscle based on the microscopic working mechanism of molecular motor,which is the origin of muscle contraction.Finally we analyzed the disadvantages in existent researches and explored future directions that need further studies.     

Seasonal variation of the temperature profile and its characteristics within urban roughness sublayer

By using conventional micro-meteorological observation data of Beijing Yuetan Park Tower (180 m), the temperature profile of urban boundary layer (UBL), its characteristics and seasonal variation are analyzed. The main results are as follows: (1) In winter, the interdiurnal surface air temperature varia- tion at the surface is not synchronized with that of the upper levels, other than in summer and other seasons, which illuminates the impacts of Beijing’s geographical location, sky view factor and stably st...