试论五人制足球的特点及其在甘肃高校推广的意义

五人制足球运动具有经济性、观赏性、适宜性、安全性等特点.甘肃的地理环境、气候特点和经济条件非常适合五人制足球运动的开展.在甘肃高校推广和普及五人制足球运动,可有效提高体育教学与训练效果,促进校园体育文化建设.     

网架结构的优化设计及极限分析

本文编制了网架结构优化设计和极限分析的计算程序．并对网架结构进行了分析。通过实例．将结构的优化设计和极限分析有机地结合起来，从而提高了网架结构的极限承载能力。     

稚鳖腹面颜色的差异与鳖种鉴别关系探讨

通过对我国现有不同鳖种的稚鳖的研究发现：不同种的稚鳖腹部表皮颜色（色斑）均有明显差异，同种稚鳖的颜色基本一致，并在一定时期内不因环境变化而改变颜色，同时发现人工养殖中华鳖种源混杂而导致人工繁殖的稚鳖腹面颜色（色斑）分化，对称状黑斑出现的比例与混杂程度有关。腹面有无对称状黑色斑点的两种类型稚鳖经生化测定和对比养殖均存在差异。说明稚鳖腹面颜色特征可作鳖种鉴别的外观依据，还可作为鳖种资源提纯复壮的指标。     

我国区域经济发展差距和对策

文章对我国东西部区域经济发展的差距进行了研究分析,并提出了相应的对策,为国家或地区的总体经济健康及稳定发展提出建议.     

空域色噪声背景下双基地MIMO雷达角度估计

空域有色噪声会导致现有多输入多输出(multiple input multiple output,MIMO)雷达算法性能下降,甚至完全失效.针对空域色噪声背景下双基地MIMO雷达联合波离角(direction of departure,DOD)和波达角(direction of arrival,DOA)估计问题,分析了...     

Control of cell growth: Rag GTPases in activation of TORC1

The target of rapamycin (TOR) is a central regulator controlling cell growth. TOR is highly conserved from yeast to mammals, and is deregulated in human cancers and diabetes. TOR complex 1 (TORC1) integrates signals from growth factors, cellular energy status, stress, and amino acids to control cell growth, mitochondrial metabolism, and lipid biosynthesis. The mechanisms of growth factors and cellular energy status in regulating TORC1 have been well established, whereas the mechanism by which amino acid induces TORC1 remains largely unknown. Recent studies revealed that Rag GTPases play a central role in the regulation of TORC1 activation in response to amino acids. In this review, we will discuss the recent progress in our understanding of Rag GTPase-regulated TORC1 activation in response to amino acids. Particular focus will be given to the function of Rag GTPases in TORC1 activation and how Rag GTPases are regulated by amino acids.     

哈尔滨市城市水资源与可持续利用

本文在分析市区水资源的基础上,着探讨了水资源开发利用存在的问题及解决途径。     

关于共轭空间X~*中有界闭凸集的端点

本文首先给出一个反例,说明共轭空间X中有界闭凸集可以无端点,从而指出了《最优控制系统的微分方程理论》一文引理3的错误,并指出此引理结论成立的条件。     

Image Retrieval Based on Objects＇ Spatial Orientation Relationships

A new concept of characteristic scanning radial (CSR) is proposed for the segmented image on the basis of two shape-speciiic points oi its shape-objects. Subsequently, two characteristic attribute sequences (CAS) of relative distance and relative direction are derived to represent the spatial orientation relationships among objects of the image. A novel image retrieval algorithm is presented using these two CASs. The proposed retrieval approach not only satisfies the transformational invariance, but also attains the quantitative comparison of matching. Experiments identify the effectiveness and efficiency of the algorithm adequately.     

高师化学系毕业生质量评价指标体系建立的基本原则和评价模式

本文探讨了高师化学系毕业生质量评价的基本原则,提出了采用T值分级法的综合评价模式,并例证了这种模式优于现行的一般测评方法。