室内无线通信网络设备库的设计与实现

随着新一代3G/4G无线通信技术的发展,室内无线网络的应用越来越广泛,室内无线通信网络设备数据库的设计与管理迫在眉睫.为了实现无线通信布局设备数据的规范化、系统化管理,解决各个公司之间设备表示的巨大差异,通过研究无线通信网络设备的属性特征,提出基于XML格式的设备数据库的设计方法,对设备属性进行合理的分类,并满足了跨平...     

普通高校阳光体育运动研究

为了贯彻党的教育方针,落实"健康第一"的指导思想,让学生走向大自然、走到阳光下,积极参加体育锻炼,对开展阳光体育的背景及现状进行了分析与阐述。从提高对体育的认识、与体育课教学相结合、营造良好的舆论氛围、建立健全组织机构、加强体育教师师资队伍建设以及保证充足的活动空间等六个方面,提出了普通高校开展阳光体育运动的对策。     

CPI指数预测的统计回归模型

对CPI值进行预测,对我国相应部门做出正确的宏观决策有积极意义.本文采用应用非常广泛的一类随机模型——统计回归模型,首先找到关于CPI指数变化的影响因素,搜集相关的大量数据;然后通过应用主成分分析法找出影响CPI的3个主要因素;最后基于3因素的数据,通过统计分析,建立回归模型,对短期内的情况进行预测.     

基于麦克斯韦电路理论的方环散射体

不同于传统数值计算方法,麦克斯韦电路(MC)理论融合了场的理论和路的理论,使二者高效地结合在一起.运用麦克斯韦电路理论分析方环散射体,研究方环散射体的MC求解方法以及MC的宽带特性,求出其散射电流,数值实验结果与矩量法结果吻合良好.研究还发现,MC可以在一个较宽的频带上得到准确电流解,因此,比其他数值方法更加高效和实用.     

Hormonal control of Sertoli cell metabolism regulates spermatogenesis

Hormonal regulation is essential to spermatogenesis. Sertoli cells (SCs) have functions that reach far beyond the physical support of germ cells, as they are responsible for creating the adequate ionic and metabolic environment for germ cell development. Thus, much attention has been given to the metabolic functioning of SCs. During spermatogenesis, germ cells are provided with suitable metabolic substrates, in a set of events mediated by SCs. Multiple signaling cascades regulate SC function and several of these signaling pathways are hormone-dependent and cell-specific. Within the seminiferous tubules, only SCs possess receptors for some hormones rendering them major targets for the hormonal signaling that regulates spermatogenesis. Although the mechanisms by which SCs fulfill their own and germ cells metabolic needs are mostly studied in vitro, SC metabolism is unquestionably a regulation point for germ cell development and the hormonal control of these processes is required for a normal spermatogenesis.     

年终密考制度初探

年终密考是清乾隆以后实行的一种年度考核地方知府以上官员的制度。这种考核形式具有严密性特点,皇帝通过核对密奏考语达到操掌地方大员的目的。与大计相比,年终密考对地方官员的仕途影响更大。     

钇对ZrCuNiAl系合金非晶形成能力的影响

利用X射线衍射(XRD)和差示扫描量热分析(DSC)研究了添加钇对Zr55 Cu30Ni5Al10Y(=0,1,2,3,4)非晶合金体系玻璃形成能力的影响。用铜模铸造获得的Zr55 Cu30Ni5Al10Y(=0,1,2,3,4)块体非晶合金的临界尺寸从直径6 mm增加到20 mm。分析认为,微量钇的添加可以与合金中的残留氧形成氧化物,降低氧对合金形成非晶态结构的负面效应。因此添加适量的稀土元素钇有利于提高Zr55 Cu30Ni5Al10Y非晶合金体系的玻璃形成能力。     

Numerical Simulation of the Morphology and Moving Velocity for Electrospun Stable Jet

GAMBIT,POLYFLOW and FLUENT POST were used to simulate the morphology and the velocity of electrospun stable jet.Simulation results shows that jet diameter decreases with the increased draw force acted on the stable jet.But too great draw force would lead to thick knots appearing along the jet or stable jet disappearing during electrospinning.There is a linear relationship between the velocity and the moving distance.But the linear relationship does not exist under great draw force.     

图书馆社会教育功能发挥的障碍分析

分析了图书馆社会教育功能发挥的内外部障碍,提出了在学习型社会提倡全民学习、终身学习的背景下,充分发挥图书馆社会教育功能的有效措施。