北疆地区城市化发展与生态环境的灰色关联性分析

以2002—2011年间指标数据为基础,采用主成分分析法、层次分析法、灰色关联性分析和相关性分析等方法对北疆地区城市化与生态环境之间的关系进行分析,计算得出两系统各指标间属于较高关联或高度关联,表明北疆地区城市化与生态环境之间的关系密切.     

美国中产阶级的“美国梦”研究——以《兔子,快跑》为例

"美国梦"的概念的出现,反映了美国人积极向上的精神,即人只要努力奋斗就能过上体面人的生活。围绕这种共识,约翰·厄普代克出版的《兔子,快跑》一书,生动地刻画了在美国梦理念下哈利·阿斯特罗姆的人生历程,折射了美国中产阶级面临的困惑与迷茫,并对美国梦进行了深刻的反思。     

影响中国学生英语自主学习的文化因素探究——对比中美大学生在外语自主学习上的差异

我国高校目前倡导英语自主学习,但效果究竟怎样还没有明确的结论。利用在美国JMU作访问学者的机会,对美国学生做了一些关于外语自主学习的问卷调查。通过与国内学生同样的问卷调查相对比,试图在中西文化因素差异方面解析中国学生自主学习时所受到的文化影响。调查发现,中美大学生在自主学习上存在文化差异。虽然英语自主学习是大学英语教学的大势所趋,但对中国学生而言,需循序渐进。最后,就所提出的影响中国学生英语自主学习的文化因素问题提出了相应的解决对策。     

论折中主义交际法在英语教学中的具体运用美国外语学习标准启示

交际法在美国外语教学中起到了立竿见影的效果，也为我国外语教学改革注入了新鲜的血液，极大地改变了我国外语教学的局面。在阅读大量美国外语教学理论与原则的文献与交际法、折中主义教学法论文基础上，结合教学实践，总结出折中主义的趋势，并提出改进措施。     

Sea surface temperature east of Australia： A predictor of tropical cyclone frequency over the western North Pacific？

The relationship between sea surface temperature (SST) east of Australia and tropical cyclone frequency over the western North Pacific (WNPTCF) is analyzed by use of observation data.The WNPTCF from June to October is correlated negatively to spring SST east of Australia.When the spring SST is in the positive phase,a cyclonic circulation anomaly in the upper troposphere and an anticyclonic circulation anomaly in the lower troposphere prevail over the western North Pacific from June to October,concurrent with an anomalous atmospheric subsidence and an enlarged vertical zonal wind shear.These conditions are unfavorable for tropical cyclone genesis,and thus WNPTCF decreases.The negative phase of the spring SST east of Australia leads to more tropical cyclones over the western North Pacific.The spring SST east of Australia may give rise to simultaneous change in tropical atmospheric circulation via the teleconnection wave train,and then subsequently affect atmospheric circulation variation over the western North Pacific.     

Diet composition of an invasive population of Lithobates catesbeianus (American Bullfrog) from Argentina

The American bullfrog Lithobates catesbeianus has been introduced around the world, with invasive populations reported from almost all South American countries. A population of this species was introduced in the Calingasta department of San Juan province, which is an arid environment in western Argentina. This work provides information on the dietary composition of an invasive population of L. catesbeianus, and compares the degree of dietary overlap between adults and juveniles. Stomach contents of 169 bullfrogs (82 adults and 87 juveniles) were analysed. Adults consumed 40 prey taxa and Hymenoptera (Insecta) was the most numerous prey item (41.8%), followed by Araneae (13.6%) and Aeglidae (13.4%). Juveniles consumed 29 prey taxa and Hymenoptera constituted the highest percentage in prey number (77.2%). The trophic overlap niche index at the same level shows a value of 0.64 overlap in dietary community between adults and juveniles of this bullfrog. Aeglidae was volumetrically the most important trophic item (25.4%), followed by Anura (25.02%). Our results showed that cannibalism in bullfrogs is more common than the consumption of native anurans, coinciding with that reported in other populations of introduced bullfrogs. The high similarity in the diets of both size classes and the association between the size of the predator and prey suggest that the impact caused by bullfrogs throughout their ontogeny is high and probably has an impact on their prey. Freshwater crabs are the main items in the diet of Lithobates catesbeianus in other introduced populations and are usually the most conspicuous at our study site. The crabs in freshwater ecosystems are part of the lowest trophic level in the food chain. The major threats to the southern region’s freshwater crabs include deforestation, farming and exotic species. Lithobates catesbeianus has a generalist diet and high overlap between adults and juveniles.     

北羌塘拗陷巴贡组致密砂岩储层特征及控制因素

北羌塘拗陷的上三叠统巴贡组碎屑岩是羌塘盆地的储层重点层系,分析沉积、成岩作用对巴贡组碎屑岩储层物性的影响机制,可以为下步勘探工作提供地质依据.研究表明,巴贡组砂岩总体的成分成熟度和结构成熟度中等偏低,溶蚀孔隙是主要的孔隙类型,孔隙结构表现为分选差、喉道细和连通差.沉积因素是控制优质储层的主要因素,形成于分流河道微相的砂...     

豫北地区高校教师体育健身活动的现状与对策

采用问卷调查等方法,对豫北地区14所高等院校的教师进行了体育健身活动现状的调查.结果显示,豫北地区高校教师参与体育锻炼的热情较高,但是缺乏对国家体育政策的了解,“体育人口”的比例低于全国平均水平,体育消费状况处于全国中等水平.同时,对调查结果进行了分析,并提出了合理化对策.     

南水北调对汉江中游襄樊市生态环境影响研究

南水北调中线工程实施后。对汉江中下游地区农业灌溉、城市发展、工业生产、航运、水质以及生态环境等产生较大的影响．分析和评价了中线工程对汉江中游襄樊市生态环境的影响,并提出了一些相应对策：进行生态环境安全规划、管理;兴建崔家营、新集水利枢纽工程;加强水污染控制和生态环境保护;加大水土保持力度,发展生态农业、生态林业、生态旅游业．确保生态环境建设的持续性、安全性和高效益性,使南水北凋中线工程调水给襄樊市造成的影响降到最低限度。促进襄樊市社会经济生态环境的可持续发展．     

西北太平洋热带气旋气候特征及其变化研究的若干进展

为了对我国气象工作者全面了解和参与热带气旋的研究有所帮助,在大量阅读和调研的基础上,介绍了近20年西北太平洋热带气旋活动在季节、年际和年代际尺度上研究的若干主要成果.重点阐述了EN-SO与热带气旋的关系,温室效应热带气旋的数值模拟和观测研究等的最新动态.