坩埚热导率对晶体生长温度场的影响

本文通过有限元数值方法计算了坩埚热导率对晶体生长温度场的影响,指出当坩埚热导率大于晶体材料的热导率时,生长区域的纵向温梯会有大幅度减小,反之,温梯变化较小。并且认为当坩埚侧面与环境的热交换系数很大时,坩埚热导率的影响作用变小。并指出坩埚热导率可以通过热处理及其他手段予以调节。     

公司价值形成的反身性机制与中国上市公司的实证研究

该研究把人的非完全理性和市场非有效对公司经理人投融资行为的影响融入公司价值的形成过程,构建了公司的价值体系,分析了公司价值形成的反身性机制。用公司价值预期与公司真实的价值创造之间的关系来建立实证模型,检验公司市场价值与内在价值之间的相关性。以中国上市公司为样本进行了实证研究,发现公司价值创造效率与市场的价值预期之间存在显著的相关关系:首先,市场对上市公司的价值预期存在偏离,表现为高估低内在价值的公司和低估高内在价值的公司;其次,这种市场预期的偏差对上市公司的价值创造具有显著的影响,表现为阻碍公司价值的创造。实证结果证明了公司价值形成反身机制的存在性。     

文化生产力的崛起与发展

马克思提出的文化生产力概念包含着正确把握现代社会智能生产力的指导性原则。文化生产力的提出, 使文化知识从非独立因素变为独立因素,由潜在生产力变为现实生产力。文化生产力的高度发展对现代文明的影响是全方位的,将对旧有的生产生活方式、思维方式、价值观念、教育模式和经营管理及领导决策产生重大影响,从而改变财富的分配方式。改革开放以来,我国文化生产力有了突破性发展,但在总体水平上同发达国家的差距很大。应当强化全民的“文化生产力”意识,建立起国家的技术创新体系和知识创新体系,加大对教育和科技的投入。     

文化资本:经济增长源泉的一种解释

文化资本是能为人们带来持续收益的特定价值观体系,它是决定经济增长的一种关键性生产要素和最终解释变量。熊彼特所揭示的企业家精神的实质在于企业家在生产中投入了文化资本。文化资本对经济增长的作用体现在两个方面:一是它具有报酬递增的特性;二是它制约着人们对资源、技术、制度等要素的选择。进行文化资本投资主要包括实现思想、言论自由与开展文化交流、改革教育内容等,它是促进经济增长的重要途径。     

植物生长调节物质对矮生一品红不定芽增殖的影响

以几种矮生一品红为材料,研究了植物生长调节剂BA,KT,IAA对不定芽增殖的影响.结果表明,影响一品红芽增殖的主要因素是细胞分裂素,以BA的增殖效果较好.不同品种(自由红、彼德之星、金钱豹、塔巴璐卡)芽增殖所需植物生长调节剂的浓度有所不同,矮生一品红试管苗芽增殖的适宜培养基为MS+BA0.5—2.0mg/L+IAA0.25—0.50mg/L.     

强苯赛对水稻幼苗根系生长的影响

强苯赛浸种对水稻幼苗的根长、根重和根系体积都有促进作用,能提高根尖细胞分裂指数,能使胚根尖切段伸长和发根力增强,并能提高胚乳中淀粉酶活性和根系的呼吸强度。     

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.     

关于教育对经济增长抑制效应的思考

教育对经济增长的抑制效应是教育对经济增长双重效应的一个重要方面。本文从确认教育对经济增长的抑制效应的存在出发,分析了教育对经济增长抑制效应的具体情形,探讨了教育对经济增长抑制效应的存在机制。     

西部金融发展的路径选择探析

通过我国东、西部金融发展水平的比较，发现西部金融正处于一种迟缓发展状态，因而未能真正发挥出对区域经济的促进作用。经过分析，认为西部应选择供给引导型金融发展道路，主动通过金融先行发展来加速经济增长。     

A Two-dimensional Heat Transfer Model for Atmosphere-land System in the Lake-dominated Alaskan Arctic

1 Introduction Shallow tundra lakes are one of the dominating landscape features in the Alaskan Arctic. They typically cover 20% of the total area of the North Slope of Alaska, and up to about 40% in the coastal plain [1,2]. Many lakes are, in their entirety or in part, shallower than the maximum annual ice thickness, consequently, some ice freezes completely to the lake bottom, nevertheless, large areas of water are deeper than the maximum ice thickness and the ice remains afloat througho…