论区域高校社会服务观念转变

区域高校必须及时转变社会服务观念以适应社会发展的要求.区域高校社会服务观念的转变,首先要进一步深化对社会服务的认识:区域高校开展社会服务,是高等教育发展的必然趋势,是区域社会经济发展的客观要求,是区域高校自身生存和发展的需要;其次,破除社会服务的观念性障碍,封闭保守思想,盲目自大思想,畏难情绪和等、靠、要思想.     

从体操新规则的变化谈体操运动的发展

每四年更改一次的国际体操规则，是随体操实践的变化而变化，它不但与自身的激烈性、 观赏性的特点相适应，而且有利于体操运动的普及与提高，推动现代体操运动不断向前发展。     

基于资源稀缺视角的房地产制度变迁

我国房地产的迅猛发展为我国经济的发展和人们住房的改善起到了较大的作用。然而,由于房价格上涨过快过高,造成了许多政治和经济问题。尽管国家出台了一系列的调控制度,但是这些制度效率低下,主要原因是这些制度结构不合理,缺乏实施机制。随着经济的不断发展,国内外经济环境的变化,国内其他制度如外汇、对外资开放等制度的改变,房地产制度也应该变迁。在坚持节约原则的前提下,遵循市场经济规律,房地产制度应该做如下变迁:提高个人住房按揭贷款的首付比例到80%或取消贷款、征收房地产物业税、取消预售制度。     

多元正态分布均值向量变点的Bayes检验

本文讨论了多元正态均值向量变点是否存在的检验问题，并给出了检验统计量，检验的临值和检验的势函数。     

Ti(Fe_(1-x)Mn_x)金属间化物的穆斯堡尔效应研究

用X射线衍射和穆斯堡尔效应对金属间化物Ti(Fe_(1-x)Mn_x)的结构随锰含量的改变而变化进行了系统的研究,结果表明,当x≥0.45时发生了结构相变.对三元系合金的同质异能移数值变化作了一定解释.     

质量互变规律在基础化学运动中的应用

从"物质的量"及"运动的量"的改变引起物质性质的改变的实例,说明了质量互变规律在化学中的应用,有助于理解、掌握化学运动的基本规律.     

普朗克常数h引起的经典物理学自然观的三种改变

物理学的研究成果,往往能使离物理学领域很远的哲学观念发生变化。普朗克常数的诞生,不仅使物理学经历了由经典到现代的“蛹-蝶”之变,而且还使人们对自然界的基本认识与基本观念发生了根本性转变。     

解读"风险社会"理论

“风险社会”理论指出:随着科学技术与现代化的高速发展,人类社会已经开始由以财富分配为主题的阶级社会向以风险分配为主题的风险社会转化,并由此导致了一系列社会结构和政治上的变迁,包括个体化进程、对科学技术和政治体制的反思等等。风险社会理论对中国的社会发展有相当的政策价值。     

^226Ra evidence for the ecosystem shift over the past 40 years in the North Pacific Subtropical Gyre

Surface seawater was collected for ~(226)Ra measurement in the North Pacific Subtropical Gyre from July to October, 1999 and October to December, 2003. Combined with the historical data reported for this sea area, a declined trend of surface ~(226)Ra concentrations was observed since 1960s, indicating the ecosystem shift in response to global warming. On one side, the enhanced stratification of the upper water column resulting from global warming reduced the ~(226)Ra input from the depth, on the other, the temporal increase of biological production resulting from the climate-related ecosystem structure change strengthened the ~(226)Ra removal from the surface ocean. Both the physical and biological processes resulted in the decrease of surface ~(226)Ra concentrations in the North Pacific Subtropical Gyre. The temporal trend of surface ~(226)Ra concentrations was consistent with the trends of chlorophyll a, silicate, phosphate and primary production previously reported. This study provided ~(226)Ra evidence for the ecosystem shift under global change.     

Holocene climatic and environmental changes recorded in Baahar Nuur Lake core in the Ordos Plateau, Inner Mongolia of China

A 5.3 m lake core was drilled in Baahar Nuur Lake in the Ordos Plateau, and measurements of meangrain size, organic δ 13C (δ 13Corg), organic carbon content (TOC), C/N, carbonate content, carbonate δ 13C(δ 13Ccar) and δ 18O (δ 18Ocar) were conducted for retrieving the Holocene chronosequence of climaticchanges based on 15 AMS 14C dates. The record documented four major stages of climate change inthe Ordos Plateau: (IV) a cold and dry condition before ～7.65 14C ka BP; (III) a warm and humid stagebetween ～7.65 and ～5.40 ka BP; (II) a generally drier and cooler climate since ～5.40 ka BP with twohumid events occurring from ～4.70 to ～4.60 ka BP and from ～4.20 to ～3.70 ka BP, and (I) a dry climatecharacterized by complete desiccation of the lake after 3.70 ka BP. Stage III can be further divided intothree sub-stages: (IIIa) a warm and humid episode from ～7.65 to ～6.70 ka BP, (IIIb) a warm and relativelydry episode from ～6.70 to ～6.20 ka BP, and (IIIc) the magthermal and maghumid episode of the Holo-cene from ～6.20 to ～5.40 ka BP.