学科服务 更多>>

关键词： 机构持股稳定性   股价暴跌   价值投资   短期行为  

摘要： 机构投资者能否改善并提高资本市场的稳定性和有效性,学术界一直存在着较大争议。本文基于机构投资者持股稳定性与股价暴跌关系的研究视角,以2001-2012年沪、深A股为样本,分析机构投资者参与公司治理的效应:能否发生稳定器作用?研究发现,机构持股稳定性与股价暴跌显著负相关,表明机构持股稳定性越高,价值投资动机越强;机构投资者持股比例与股价暴跌风险呈倒"U"型关系,当机构投资者持股比例较低时,机构投资者短期交易动机越强;依据"规模经济"和"信息优势"观点,机构投资者持股比重提高,降低和化解管理层因窖藏坏消息而导致的股价暴跌风险,提升股价稳定性。

关键词： 纤维及其制品   标准样品   查询系统   纤维制品   物理性能   分类归纳   标准样卡   工艺处理   检验过程   检测仪器  

摘要： 纺织纤维的种类繁多,纺织纤维制品就更为丰富。由于纤维制品不同的使用目的,在其加工过程中又赋予了一些功能性的工艺处理,使得纤维制品检验项目既有物理性能的检验还有化学分析方面的检验。本文从现有的纤维及其制品检验项目入手,对检验过程中使用到的各种标准样品进行分类归纳,着重说明分模块建立纤维及其制品检验标准样品查询系统的重要性。纤维及其制品的检验项目随着科技的进步,检测技术也随之不断地发展,

关键词： 缓冲溶液   缓冲量   PH   配制  

摘要： 本文介绍了缓冲溶液在实验过程中的作用原理、影响缓冲溶液的因素、配制缓冲溶液遵循的原则、使用缓冲溶液的注意事项。

关键词： 微生物检验   医院感染  

摘要： 目的探讨分析微生物检验在医院感染控制中的地位及作用。方法选取2014年1-12月与我院住院进行治疗的130例患者作为研究对象,随机分为常规组（n=65）和检验组（n=65）。常规组给予药物等常规治疗,而检验组在常规组的基础上给予微生物检验,观察两组患者感染发生情况。结果常规组轻度、中度和重度感染分别为10.8%、4.6%和3.1%,检验组分别为3.1%、1.5%和1.5%,两组间比较无统计学差异（P均〉0.05）,而检验组的总感染率为6.2%,明显低于常规组18.5%的总感染率,比较有统计学差异（P〈0.05）。结论微生物检验可以预防医院感染,降低感染发生率,在医院感染控制中具有重要地位和作用。

关键词： 电针   阴部神经刺激疗法   尿失禁   压力性   序贯检验  

摘要： 目的:验证电针阴部神经刺激疗法治疗压力性尿失禁的临床疗效。方法:应用开放型单相序贯检验,观察纳入的51例重度压力性尿失禁患者。结果:研究至18例时,实验线已穿过上界,结论为有效。结论:电针阴部神经刺激疗法治疗重度压力性尿失禁近期有显著性疗效,值得推广。

关键词： 生化检验结果   临床生化检验   标本溶血   日常工作   水浴温度   细胞破坏   监测结果   经济负担  

摘要： 溶血是检验科临床生化检验常发生的影响和干扰，在日常工作中，有很多原因可以导致此种现象，如试管不洁、过度震荡或摇晃、采血过快、检验中水浴温度过高以及采血时进入了空气等。一旦发生标本溶血，不仅会破坏红细胞，还会干扰白细胞和血小板等细胞破坏释放的物质，影响监测结果，可能造成患者多次重复就诊，增加患者经济负担，甚至可直接导致医师误诊而发生意外情况。

关键词： Extreme droughts   Poyang Lake   Yangtze River   The Three Gorges Dam   River-lake interaction  

摘要： In recent years, the Poyang Lake basin is in a prolonged drought which has placed immense pressure on the water resources utilization. In this paper, we explore the spatial and temporal distributions of extreme droughts in the Poyang Lake basin by using the methods of SPI (Standardized Precipitation Index) and EOF (Empirical Orthogonal Function) for the period of 1956-2009, which are influenced by regional precipitation anomalies and river-lake interaction due to water impounding of the Three Gorges Dam (TGD). The results show that: (I) the Poyang Lake basin experienced six extreme droughts during the past 60 years, which lead to decreases in streamflow from five tributary rivers down to the Poyang Lake. The droughts in the 1960s and the 2000s were the most serious ones. However, there was an increasing trend of streamflow in the upper and middle Yangtze in the 1960s, and a decreasing trend appeared in the 2000s. The decline of streamflow in the upper Yangtze reaches has lowered the water level of lower Yangtze River which has-caused more outflow from the Poyang Lake to the Yangtze River;(2) the operation of the Three Gorges Dam (TGD) has altered the seasonal pattern of flow regimes in the Poyang Lake and significantly reduced the water level in the lower Yangtze River during the TGD impounding period from late September to early November;and (3) the conjunction of extreme droughts in the Poyang lake and the upper Yangtze reaches coincided with the impounding of the TGD is the main cause of the low water level in the Poyang Lake. Although the impact of the recent droughts in the Poyang Lake and upper Yangtze reaches has played a crucial role in the low water level of Poyang lake, more attention should be paid to its sensitivity to the influence of the large dam-induced changes in the interaction between river and lake, particularly during impounding periods. (C) 2015 Elsevier B.V. All rights reserved.

关键词： Wheat   stability parameters   adaptability   cold zone   genotype x environment interaction  

摘要： In order to evaluate adaptability and stability of wheat genotypes grain yield and also to select and introduce the most productive genotype, regional tests were conducted in the form of randomized complete block design with three replicates and 18 genotypes in eleven different regions were evaluated during two cropping season years (2009-2011). The grain yield data were combined variance analyzed. Given the significance of trilateral interaction, stability analysis was performed with parametric and non-parametric statistics and different methods including environmental variance, coefficient of environmental variations, Wrickeequivalence, Shukla stability variance, rank test, simultaneous selection and Eberhart and Russell methods in roder to conduct more precise investigation on the interactions and stable lines. Results obtained using different methods were to some extent similar. In most methods, the lines no 8, 16, 18, and 10 with average yields of 6.778, 6.671, 6.046, and 6.601 ton/ha were reported to be the most stable lines.

关键词： Emotion Recognition   Feature Selection   Filter Approach   Wrapper Technique   Feature Normalization   Classification  

摘要： A comparative analysis of filter and wrapper approaches of feature selection has been presented for the audio, visual and audio-visual human emotion recognition. A large set of audio and visual features were extracted, followed by speaker normalization. In filter approach, feature selection was performed using the Plus l-Take Away r algorithm based on Bhattacharyya distance criterion. In wrapper method, features were selected based on their classification performance using support vector machine (SVM) classifier. Finally, an SVM classifier was used for human emotion recognition. The filter approach provided a slight better performance in comparison to wrapper approach for seven emotions on SAVEE database.

关键词： devices   extractables   leachables   parenteral packaging   safety assessment  

摘要： To develop and justify a Risk Evaluation Matrix for estimating the safety risk associated with extractables from plastic materials used in pharmaceutical applications and to apply that matrix to approximately 510 extractables to assess the risk that they would accumulate in drug products at levels sufficiently high to affect patient safety. The Risk Evaluation Matrix considers toxicological, availability and solubility characteristics of extractables. Safety Risk categories were established based on certain scaled values for these characteristics, Total Risk Scores were calculated for each extractable and the extractables were categorized with respect to their safety risk based on these calculations. The Total Risk Scores were normally distributed around a value of 20 to 23, corresponding to safety risk categories of moderate and intermediate risk. The range in Risk Scores defined by the mean +/- one standard deviation encompassed the entire region of moderate and intermediate risk. Approximately 15% of the extractables were categorized as lowest risk while 3% of the extractables were categorized as highest risk. Categorization of extractables could facilitate the selection of materials for use in pharmaceutical systems, the analytical testing of extracts and the selection of target extractables.