An investigation of water-gas interface migration of the upper Paleozoic gas pool of the Ordos Basin using reservoir fluid inclusion information

There is a particular characteristic in the formation of the Upper Paleozoic gas pool in the Ordos Basin that is its water-gas interface migrated regional during geological history. However, there has been lack of detailed research on this problem and also no similar report on other basins. In this paper, the formation time of the fluid inclusions formed in the water-gas transition zone of the gas pool was deduced using their trapping temperatures and combining of the burial with geothermal history of the basin. On the basis of this, the isochrone of water-gas interface migration for the gas pool was mapped. The result shows that the gas pool began to form around the Yanan Area at about I65Ma, and then developed and enlarged toward the north direction. The gas pool finally formed at about 129 Ma. Since the basin uplifted from the late Cretaceous and gas supply decreased, the water-gas interface of the gas pool migrated back to the present position.     

杭州地域文化的形成及其特征

在自古以来的吴越之地 ,杭州的地域文化堪称独特 ,其所以如此 ,最直接的原因是靖康之难以后 ,北方移民大量南迁 ,以及南宋建都于临安 (杭州 )。这在学术界是没有任何异议的看法。但笔者认为 ,要全面认识杭州独特的地域文化 ,还应有更宽的视野。杭州地域文化形成的几个重要因素大约是 :一、数量占优的北方移民 ;二、在人口压力下 ,人们治生方式的多样化 ;三、南宋所面临的政治军事的严峻形势。在以上诸因素的作用下 ,杭州地域文化表现出刚柔相济、义利兼顾 ,矜持而务实 ,智巧而淳厚、勤奋而又不失从容的基本特征。     

佛山市三水区人口耕地粮食可持续发展研究

通过分析1949年以来三水区人口、耕地和粮食的动态变化特征,指出三水区人口、耕地和粮食的发展对三水区可持续发展的制约作用及其原因,提出实现三者可持续发展的主要对策是控制人口增长、保护耕地资源和多元化发展粮食生产。     

利用回交群体对小麦雌性不育基因的SSR标记

对普通小麦新601、雌性不育材料XND126及其BC1群体的育性进行了观察.分析结果表明,此组合中雌性不育表现为1对隐性基因的遗传.结合集群分析(Bulked Segregant Anal-ysis,BSA)法在亲本间筛选了1 080对微卫星引物,并利用回交群体对小麦雌性不育基因进行了SSR分子标记,确定微卫星引物cfd36标记与雌性不育基因连锁,其遗传距离为13.0 cM.     

世界主要的宗教婚育观对人口生产的影响

世界各大宗教都有自己的婚姻观、生育观、人口观，她们几乎一致认为婚姻是神圣的，人们应当在自由平等、互敬互爱的前提下遵守“自由自主”的婚姻制度，反对人为地限制生育，主张增殖人口。这种婚育观对当今世界人口数量以及生产产生了深远的影响。     

南充市微尾鼩种群空间分布的研究

利用4种聚集度测定指标和Taylor,Iwao检验法对微尾鼩种群空间分布进行研究.结果表明:微尾鼩种群空间分布格局属于典型的聚集分布,聚集的基本单位为个体群,一个个体群为一个家族,个体群为聚集分布且具有明显领域性.不同月份聚集程度不同,其平均密度与聚集指数呈极显著负相关(r=-0.913,|r|>r0.01,(12-2)=0.7079),表现为高密度、低聚集;低密度、高聚集的分布特征.     

Parentage determination of an isolated Yangtze finless porpoise population Neophocaena phocaenoides asiaeorientalis in the Yangtze Tian-e-Zhou Baiji National Natural Reserve based on molecular data

Reproductive behaviors are poorly known for the Yangtze finless porpoise Neophocaena phocaenoides asiaeorientalis. In this study, the parentage of an isolated Yangtze finless porpoise population inhabiting the Yangtze Tian-e-Zhou Baiji National Natural Reserve is determined by analysis of microsatellite loci and mitochondrial DNA (mtDNA) control region sequences, and the porpoise's reproductive behaviors are studied. Overall 4 full parentage assignments and additional 3 single parentage assignments were determined for the population of 23 individuals. The analysis shows that their estimated reproductive cycle is shorter than that reported previously and there probably exists an overlapping between gestation and lactation period. The study also shows that the female does not show fidelity to a particular male for breeding and vice versa, the oldest males did not monopolize mating and the dominance rank could not be so strict for the porpoise society. Moreover, the porpoise's mating pattern and relatedness among candidate parents are discussed here. These results provide important information for making guidelines of management and conservation for this protected population.     

基于GIS的人口信息提取

为准确提取区域人口信息,在传统的面积内插方法的基础上提出了基于人口真实分布的面积内插方法。该方法把研究区域分为人口居住区(均匀分布)和非居住区(分布为零),得到的人口分布和传统方法相比,前者更接近于人口的真实分布。用人口密度的递归算法,估计出稀疏地区的人口密度,求出密集地区的人口密度;再把密集区分为新的人口稀疏区和密集区,此过程反复直至求出接近于人口真实分布的人口模型。该方法简便可行,适合模拟城乡结合部的人口分布。     

Age-Structure and Dynamic of Dominant Population of Castanopsis carlesii Community in Dujiangyan City, Sichuan, China

0Introduction Theevergreenbroad leavedforestareaofwesternSichuanbasinisanarrowregionfromnorthtosouth.Itformsatopography protectivescreencalledas“famoushighprecipitationareaofwesternChina”with especiallyplentifulprecipitationandmuchstorm.Itisanimportantd…     

奇偶相干态的熵压缩

研究了奇偶相干态的位置熵和动量熵的压缩特性 ,并讨论了位置熵压缩、动量熵压缩与广义坐标、广义动量压缩性的关系 .结果表明 ,与方差压缩不同 ,奇偶相干态的位置熵和动量熵都会表现出压缩性 .