高校基本建设投资的有效控制

在高校基本建设的投资不断增加的前提下,文章通过4个方面的分析,探讨了有效控制基本建设投资的方法。     

Statistics for weighing benefits and harms in a proposed genetic substudy of a randomized cancer prevention trial

Summary.  When evaluating potential interventions for cancer prevention, it is necessary to compare benefits and harms. With new study designs, new statistical approaches may be needed to facilitate this comparison. A case in point arose in a proposed genetic substudy of a randomized trial of tamoxifen versus placebo in asymptomatic women who were at high risk for breast cancer. Although the randomized trial showed that tamoxifen substantially reduced the risk of breast cancer, the harms from tamoxifen were serious and some were life threaten-ing. In hopes of finding a subset of women with inherited risk genes who derive greater bene-fits from tamoxifen, we proposed a nested case–control study to test some trial subjects for various genes and new statistical methods to extrapolate benefits and harms to the general population. An important design question is whether or not the study should target common low penetrance genes. Our calculations show that useful results are only likely with rare high penetrance genes.     

汉口租界的报刊与传播控制

近代汉口新闻事业之发端与繁荣,与租界及租界特殊的传播环境有密切关系。开埠以来,外侨与国人在汉口的五国租界里创办了近百种报刊。租界内的新闻传播受到多方面控制:汉口租界当局的基本章程中有关于新闻传播管理的条例;满清与北洋政府从多方面对租界内的报刊进行钳制;军阀势力与帝国主义列强亦常插手干涉。与上海租界相较,汉口租界的媒介与传播环境仍有自己的特色。     

经济适用住房成本控制体系问题及对策

本文从总结现阶段经济适用房建设的基本模式入手,分析了经济适用房建设中住房成本控制体系中存在的主要问题及其原因,最后提出了若干对策。     

失控的政府与政府的失控

凡立宪国家,不管民主政治发展的实际程度如何,一般都采用分权制衡的权力结构模式,即国家的立法、行政和司法权都由不同的机构来行使。二战后,权力结构的重心不断向行政方面转移,原有的三权分立制衡机制失衡,使得行政权失去应有的制约,导致出现失控的政府;失控的政府致使行政权呈现无限扩大的趋势,导致政府失控。政府失控所带来的政治和社会问题,成为现代各国的一大难题。     

COMPARISONS AND SELECTION OF TWO-PARAMETER EXPONENTIAL POPULATIONS

For two-parameter exponential populations with the same scale parameter (known or unknown) comparisons are made between the location parameters. This is done by constructing confidence intervals, which can then be used for selection procedures. Comparisons are made with a control, and with the (unknown) “best” or “worst” population. Emphasis is laid on finding approximations to the confidence so that calculations are simple and tables are not necessary. (Since we consider unequal sample sizes, tables for exact values would need to be extensive.)     

载波相位平滑GPS伪码伪距的研究

分析了全球定位系统接收机可获取的观测量。给出了载波相位平滑伪码伪距的一个递归算法结构。讨论了平滑算法初值的设定和构造伪距前向预测值，并对各种情况进行了统计分析。文中还给出了平滑算法的性能评估，结论表明载波相位平滑技术可大大改善伪距观测精度。改善程度与该算法中的权重因子和递归时间密切相关     

陶土坩埚玻璃拉丝机用红外测控仪的研制

介绍了对陶土坩埚玻璃拉丝机加装红外测控仪的原理、方法及试用效果。     

密度分布非均匀的反馈控制Logistic单种群模型平衡态的稳定性

本文对种群密度在非均匀分布情形下,考虑了具反馈控制的滞后 Logistic 生态模型平衡位置的稳定性;分别给出了在常时滞和弱连续时滞以及强连续时滞情况下的稳定性条件;其结果是对 Gopalsamy 在密度均匀分布情形下相应结果的推广.     

高精度渗碳控制方法

在采用电阻法直接测控碳势的方法中,提出了一种分段参数调节增量式PID算法,通过实际调试和理论推导表明,渗碳工艺过程控制具有控制超调量小、过渡时间短、精度高、软件实现方便等优点,稳定后碳势控制精度可达±0.03%。