单斜杆中心支撑钢框架模型静力试验研究

采用静力试验的方法对相似比为1∶4的7层缩尺单斜杆角钢中心支撑钢框架模型进行水平往复加载,研究其在低周反复荷载作用下的滞回曲线、骨架曲线、刚度退化以及整个模型的耗能等,通过以上的内容评定单斜杆角钢中心支撑钢框架的抗震性能。     

储层伤害试井评价新方法研究

针对传统储层伤害试井评价的污染带渗透率求取存在较大偏差,进而影响表皮系数准确分解的问题,建立了改进的麦金利图版试井分析新模型,利用拉普拉斯变换进行了求解,并编程绘制了新的分析理论图版（改进的麦金利图版）,获得了新的拟合解释方法,可以非常准确地求取污染带渗透率。再利用Hawkins 公式,优化计算真表皮系数和污染半径,从而利用污染带渗透率、污染半径和真表皮系数进行储层伤害试井评价。最后,进行了实例分析,结果符合现场实际,为改善储层、采取措施提供了依据。     

对高校考试管理及改革的研究与探索

对当前考试管理工作存在的问题进行分析,要适应时代发展的需求,必须改革考试制度,要吸取各种考试方式的优点,形成合理考试模式,使之科学化、现代化是摆在高校考试管理工作者面前一项亟待解决的课题。要适应当前科学技术和社会经济发展的需要,培养具有高素质的创新人才,就必须建立有利于学生综合素质和能力培养的考试制度、内容、方法,全面推进考试模式改革。     

智能化辅助试井解释

综合集成的试井解释模型和解释模型的自动识别一直是试井解释研究的热点,文中提出了一种基于句法模式识别的试井模型识别新技术,它克服了现有技术在曲线形态识别与模型诊断推理方面的困难,将模型识别的复杂过程分为特征抽取、形态跟踪、模型推断等简单过程;利用试井分析和非线性最优化技术形成了一套集成多种解释模型的高效率解释软件。     

劳动力转移对农户测土配方施肥技术选择的影响

基于陕、甘、鲁、豫四个苹果主产省农户微观调研数据,运用Logit模型、Probit模型和效应分解模型分析劳动力转移对农户测土配方施肥技术选择的影响机理。结果表明:劳动力转移对农户测土配方施肥技术选择具有稳健的正向影响;劳动力转移产生的人口效应与收入效应均为正,且人口效应大于收入效应;户主文化程度、是否为村干部、种植年限以及是否加入合作社对农户技术选择具有显著正影响;化肥施用量认知对农户技术选择具有显著负影响。     

全国大学生足球赛增设超级联赛的必要性

通过对全国大学生足球联赛的分析,认为增设超级联赛,并设立严格的资格审查制度,进行文化课程测试,将更加有利于发挥大多数高校和学生的积极性。为足球运动在高校的普及和提高创造更好条件。     

建立适应市场经济的用人制度

目前世界各国有关国家工作人员的任用大体有四种制度,即委任制、聘任制、选任制、考任制.委任制和事实上的终身制都不适应市场经济.改革用人制度,建立适应社会主义市场经济的、竞争性的考任制用人制度势在必行.     

Testing drug additivity based on monotherapies

Under the Loewe additivity, constant relative potency between two drugs is a sufficient condition for the two drugs to be additive. Implicit in this condition is that one drug acts like a dilution of the other. Geometrically, it means that the dose‐response curve of one drug is a copy of another that is shifted horizontally by a constant over the log‐dose axis. Such phenomenon is often referred to as parallelism. Thus, testing drug additivity is equivalent to the demonstration of parallelism between two dose‐response curves. Current methods used for testing parallelism are usually based on significance tests for differences between parameters in the dose‐response curves of the monotherapies. A p‐value of less than 0.05 is indicative of non‐parallelism. The p‐value‐based methods, however, may be fundamentally flawed because an increase in either sample size or precision of the assay used to measure drug effect may result in more frequent rejection of parallel lines for a trivial difference. Moreover, similarity (difference) between model parameters does not necessarily translate into the similarity (difference) between the two response curves. As a result, a test may conclude that the model parameters are similar (different), yet there is little assurance on the similarity between the two dose‐response curves. In this paper, we introduce a Bayesian approach to directly test the hypothesis that the two drugs have a constant relative potency. An important utility of our proposed method is in aiding go/no‐go decisions concerning two drug combination studies. It is illustrated with both a simulated example and a real‐life example. Copyright © 2015 John Wiley & Sons, Ltd.