基于互信息的功能磁共振图像配准

互信息作为衡量两幅图像配准的相似性测度函数,当两幅图像配准时,互信息达到最大值。该文提出了基于互信息脑功能磁共振图像配准新方法,采用了无需计算梯度的Powell直接搜索算法,并通过多分辨的方式加快了图像配准速度。磁共振的配准实验证明,互信息法能准确地实现多模态医学图像的配准,并且能达到亚像素的精度。     

RuCl2[P(C6H5)3]2(NH2CH2CH2NH2)催化苯乙酮加氢反应的研究

优化了以RuCl2[P(C6H5)3]2(NH2CH2CH2NH2)作催化剂催化苯乙酮加氢制备α-苯乙醇的反应条件,考察了反应温度、反应压力、碱的用量及不同的碱对反应的影响,得出了一个较好的反应条件.     

基于层次分析法的职务绩效定量分析

针对企业绩效评价中存在的问题,引用管理决策的层次分析法,从系统论的角度,对企业职务绩效指标进行整体分析和比较,更为科学地确定了绩效体系中各指标的权重。     

论中国艺术表演团体改革的实现途径--兼论中国文化体制改革的特殊性

中国文化事业体制改革的目标和道路要受到行业内部特殊矛盾运动形态的制约。以艺术表演团体改革为例透视文化事业单位改革与政府策略选择之间的关系,可以为决策者提供一种有关中国文化事业体制改革过程和特点的具象把握。在整个社会由计划经济体制向社会主义市场经济体制转轨时期,艺术表演团体固有的政治-伦理角色、市场-经营角色、艺术-行业角色三重身份和伦理性目标、政治性目标、经济效益目标、审美价值目标等多重目标之间相互矛盾、相互依存和对立统一,共同构成了艺术表演团体内部复杂的矛盾运动。而正是这种矛盾特殊性构成各级政府在推进艺术表演团体改革过程中的策略选择基础。     

The econometrics of female labor supply and children

This is a survey of applied econometric research on the effects of children on female labor supply. Reasons for interest in the topic, and a basic model and terminology, are reviewed. Concerns are raised about the possible endogeneity of child status variables, and about the instrumental variables approach for dealing with this problem. Alternative ways of conceptualizing and estimating child status effects are considered, together with selected empirical evidence. Relevant developments from the household demand literature are summarized. Basic issues of model choice are also discussed.     

The analysis of incomplete data using stochastic covariates

In the development of many diseases there are often associated random variables which continuously reflect the progress of a subject towards the final expression of the disease (failure). At any given time these processes, which we call stochastic covariates, may provide information about the current hazard and the remaining time to failure. Likewise, in situations when the specific times of key prior events are not known, such as the time of onset of an occult tumour or the time of infection with HIV-1, it may be possible to identify a stochastic covariate which reveals, indirectly, when the event of interest occurred. The analysis of carcinogenicity trials which involve occult tumours is usually based on the time of death or sacrifice and an indicator of tumour presence for each animal in the experiment. However, the size of an occult tumour observed at the endpoint represents data concerning tumour development which may convey additional information concerning both the tumour incidence rate and the rate of death to which tumour-bearing animals are subject. We develop a stochastic model for tumour growth and suggest different ways in which the effect of this growth on the hazard of failure might be modelled. Using a combined model for tumour growth and additive competing risks of death, we show that if this tumour size information is used, assumptions concerning tumour lethality, the context of observation or multiple sacrifice times are no longer necessary in order to estimate the tumour incidence rate. Parametric estimation based on the method of maximum likelihood is outlined and is applied to simulated data from the combined model. The results of this limited study confirm that use of the stochastic covariate tumour size results in more precise estimation of the incidence rate for occult tumours.     

加强管理提高毕业设计(论文)质量

为提高学生毕业设计 (论文 )质量 ,在管理方面采取了一系列措施 :完善管理制度 ,注重质量控制 ,重视选题质量 ,加强教师指导 ,严格答辩要求 ,科学评定成绩 ,评选优秀设计 (论文 )。     

会计服务业走向国际化的发展策略

为了更好地与国际惯例协调,提高会计服务业的竞争力和整体水平,会计服务业应充分利用WTO有关协定条款,有计划地逐步开放会计市场.正确认识WTO对会计行业的制度性要求,在合理、客观、公正的前提下,制定我国会计服务业切实有效的发展规划和策略,制定适合我国国情、符合我国会计服务业发展要求的规章制度,深化会计师事务所改革,加强国际市场竞争能力,促进会计服务业的稳定发展.     

古汉养生精对运动小鼠血糖、肝糖原、肌糖原含量影响的实验研究

研究古汉养生精对运动小鼠力竭运动时间、血糖、肝糖原、肌糖原含量的影响.4周龄昆明种小鼠随机分为对照组、运动组、古汉养生精组.运动组和古汉养生精组进行4周的游泳训练,最后一次进行力竭游泳后采用心脏取血,肝素抗凝,测定血糖含量.取肝组织和后肢肌肉测定肝糖原、肌糖原含量.实验4周后,古汉养生精组力竭时间明显延长(P＜0.01),血糖浓度、肝糖原(LG)和肌糖原(MG)含量均高于运动组(P＜0.05,P＜0.01);古汉养生精组血糖浓度、LG和MG含量与对照组比较均无显著性差异(P＞0.05).结果表明,服用古汉养生精具有延长小鼠力竭运动时间和增加能源贮备的作用.     

沈从文创作心理三部曲

沈从文家世的衰落和在社会(主要是在北京)遭到的拒绝使他产生了自卑心理,在摆脱自卑的重负和与城市搏斗的过程中,他形成了“乡下人”的审美立场,构建了城乡异趣的文学世界,从而使自己获得了自尊,达到了生命中的“高峰体验”,进而达到超越自卑的境界,成了“自我实现的人”。在心理的迁移过程中,沈从文的创作呈现了三部曲:感伤/回忆—嘲讽/抒情—白描/写实。在此基础上,《边城》意蕴、《长河》残卷也有了新的阐释。