可微充分条件的改进     

徐斌 《蒙自师范高等专科学校学报》2006,4(2):85-86

对于二元函数,两个偏导数都连续当然可以推得可微,本文将说明其实只要有一个偏导数连续就可推得可微.  相似文献   

英汉"满数"和"歉数"发微     

庄建灵 《泉州师范学院学报》2004,22(1):129-132

“满数”和“歉数”是在数量的计数、思维、抽象、概括的基础上生产的，经历着由精数到概数，由具体到抽象，由数量的表示到心理描述的发展，是值得注意的语言现象。  相似文献   

粘性土中LDBPs桩侧极限摩阻力研究     

石名磊  邓学钧  刘松玉 《东南大学学报》2002,18(2):154-158

根据10根试桩静载荷试验和桩身应力测试结果，在对桩侧极限摩阻力预测技术系统分析的基础上，研究了粘性土中LDBPs桩侧极限摩阻力的预测方法和指标确定。针对硬塑状态的粘性土，提出了不排水强度指数μ的概念，综合了粘性土不排水条件下内摩擦角和粘聚力。基于这一概念，对传统的“a法”进行了扩展，使之更加有效地应用于粘性土中LDBPs桩侧摩阻力的预测。同时还对SPT锤击数N预测粘性土中LDBPs的桩侧摩阻力进行了统计分析，并对粘土和亚粘土分别提出了相应的回归公式。  相似文献   

试论高职院校固定资产管理   总被引：1，自引：0，他引：1  

臧英 《天津职业院校联合学报》2006,8(1):56-58

高职院校的资产逐年递增,固定资产作为资产的主要构成项目,无论从数量、价值、种类等都发生着很大的变化,其投资规模和增加的速度是前所未有的。固定资产作为高职院校办学的物质基础和条件,能否有效地进行管理和保护,直接关系到学院的教育事业能否稳固发展的问题。应遵循科学发展观,本着科学的态度切实加强固定资产的管理。  相似文献   

北京奥运会中国奖牌统计分析及特点研究   总被引：5，自引：0，他引：5  

黄文敏  张扬文 《首都体育学院学报》2009,21(1)

奥运会奖牌榜反映着各参赛国的总体实力.采用文献资料、数理统计、逻辑分析等方法,对第29届奥运会中国奖牌榜进行统计分析,研究表明:1)中国竞技体育整体水平全面提高;2)中国奖牌榜呈"倒金字塔"的结构性特征;3)奖牌分布呈现"优势项目井喷、潜优项目突破、基础项目低速"的不均衡特征;4)男女比例逐渐均衡;5)队伍年龄结构趋于合理.研究有利于理智客观地判断我国体育的真实实力,同时认识到与世界体育强国的差距,促进中国体育全面可持续发展.  相似文献   

常熟市古城区河流水质卫生细菌学调查     

吴金男  吴友良 《常熟理工学院学报》2000,14(2):69-71

采用平板菌落计数法和发酵法对常熟市古城区河流五个河段的水体进行了卫生细菌学调查．结果表明：常熟市古城区河流的水质受生活垃圾污染的情况比较严重,细菌总数均在 ４万／ｍＬ以上．大多数超过１０万／ｍＬ,最高达５６万／ｍＬ,大肠菌群数＞２３８００个／Ｌ．对城区水域的环境整治已刻不容缓．  相似文献   

The influences of counting methods on university rankings based on paper count and citation count   总被引：1，自引：0，他引：1  

Chi-Shiou Lin  Mu-Hsuan Huang  Dar-Zen Chen 《Journal of Informetrics》2013,7(3):611-621

In an age of intensifying scientific collaboration, the counting of papers by multiple authors has become an important methodological issue in scientometric based research evaluation. Especially, how counting methods influence institutional level research evaluation has not been studied in existing literatures. In this study, we selected the top 300 universities in physics in the 2011 HEEACT Ranking as our study subjects. We compared the university rankings generated from four different counting methods (i.e. whole counting, straight counting using first author, straight counting using corresponding author, and fractional counting) to show how paper counts and citation counts and the subsequent university ranks were affected by counting method selection. The counting was based on the 1988–2008 physics papers records indexed in ISI WoS. We also observed how paper and citation counts were inflated by whole counting. The results show that counting methods affected the universities in the middle range more than those in the upper or lower ranges. Citation counts were also more affected than paper counts. The correlation between the rankings generated from whole counting and those from the other methods were low or negative in the middle ranges. Based on the findings, this study concluded that straight counting and fractional counting were better choices for paper count and citation count in the institutional level research evaluation.  相似文献   

环Zp+uZp+u~2Zp上自对偶码的个数(u~3=0,p为奇素数)     

王冬银 《巢湖学院学报》2012,(3):10-13

本文主要讨论了环Zp+uZp+u2Zp(u3=0,p为奇素数)上自对偶码,通过环Zp上的对偶码得出环Zp+uZp+u2Zp上自对偶码的个数。  相似文献   

论文下载次数与阅读使用次数的调查分析   总被引：1，自引：0，他引：1  

林佳瑜 《图书馆杂志》2012,(3):36-39

针对已有研究中的文献下载次数与阅读次数呈高度正相关的假设,本论文通过调查和交叉分析统计获得文献的下载次数与阅读的次数并不体现高度正相关,论文被下载并不代表论文被使用或被利用。  相似文献   

ASPECTS OF SUB-LITERATURE     

Meredith Brown 《期刊图书馆员》2013,64(1):27-30

The research community is continually trying to find the quickest method for evaluating the quality of a scholarly article. Today’s technological advancements and growing communication outlets complicate the meaning of a quality article. Altmetrics attempts to take the place of impact factor and citation counting by predicting the outcome of an article based on the previous behavior of statistics. Perhaps, the best way to evaluate the quality of an article is to look at all of the Altmetrics methods and their relationship to each other. Context explains every Altmetric and is more significant than an article’s popularity. Librarians should guide patrons and researchers alike through these statistics’ advantages and disadvantages.  相似文献