四川盆地中三叠世盐盆分布与演化特征研究

四川盆地卤水分布广泛，资源丰富, 早为世人所瞩目，中三叠统雷口坡组是四川盆地最早开采天然气和盐卤的层系之一。根据盆地雷口坡组大量钻井资料研究表明，盆地雷口坡组主要成盐期分别为雷三2 期和雷四2 期，在盆地东部和南部由于受到古隆起的影响，盐岩地层已被剥蚀难以保存，现今盐岩主要分布在开江古隆起和泸州古隆起的西部以及天井山古隆起的南部（华蓥山以西—龙门山以东的川西—川中地区）。印支运动对盆地雷口坡组盐岩在平面的迁移起着十分重要的作用，根据不同时期盐岩统计数据看，两期盐盆在平面上具有向西迁移、叠加的特征，其中川中的GS1 井就钻遇了这两期的盐岩。     

Cognitive abilities,self-efficacy,and financial behavior

This paper investigates the effect of cognitive abilities on financial behavior among older adults. Using the U.S. Health and Retirement Study, I find that cognitive abilities significantly affect financial behavior through two channels: ability and self-efficacy. People with higher cognition scores achieve better financial outcomes. This positive association is especially strong in tasks having high demand of cognitive abilities, which confirms the ability channel of the cognitive ability effect. In addition, there is evidence for the self-efficacy channel as a secondary source of cognitive influence. Lower cognitive abilities decrease people’s sense of self-efficacy, which, in turn, significantly decreases financial management efficiency. The findings have important policy implications, specifically that more effort is needed to assist the growing older population through the cognitive aging process and that noncognitive skills, as a secondary source of influence, also warrant attention.     

Heteroscedastic Global Tests that the Regression Parameters for Two or More Independent Groups are Identical

Simulation results are reported on methods that allow both within group and between group heteroscedasticity when testing the hypothesis that independent groups have identical regression parameters. The methods are based on a combination of extant techniques, but their finite-sample properties have not been studied. Included are results on the impact of removing all leverage points or just bad leverage points. The method used to identify leverage points can be important and can improve control over the Type I error probability. Results are illustrated using data from the Well Elderly II study.     

论五四后梁漱溟在传统思想现代化方面的局限性

五四运动后的 2 0 -3 0年代 ,为使传统思想现代化和西方思想中国化 ,梁漱溟在推崇宋明理学的同时 ,吸收了许多西方近代资产阶级思想来完善自己的理论。但就总体而言 ,梁漱溟所做的理论探索和实践运作 ,有很大的局限性 ,与中国的现代化思想相去甚远 ,倒是更多地表现了保守、落后和空想的成分     

语言·命运·历史——论吉本《苏格兰的书》

苏格兰小说家吉本最著名的作品是其三部曲《苏格兰的书》。这部小说在语言的运用上独具特色 ,对女主人公命运的关注显示出这位男性作家超前的女性主义意识。而小说的叙述结构所蕴含的历史观则是进步和乐观的     

Spatial variation in soil inorganic nitrogen across an arid urban ecosystem

We explored variations in inorganic soil nitrogen (N) concentrations across metropolitan Phoenix, Arizona, and the surrounding desert using a probability-based synoptic survey. Data were examined using spatial statistics on the entire region, as well as for the desert and urban sites separately. Concentrations of both NO₃-N and NH₄-N were markedly higher and more heterogeneous amongst urban compared to desert soils. Regional variation in soil NO₃-N concentration was best explained by latitude, land use history, population density, along with percent cover of impervious surfaces and lawn, whereas soil NH₄-N concentrations were related to only latitude and population density. Within the urban area, patterns in both soil NO₃-N and NH₄-N were best predicted by elevation, population density and type of irrigation in the surrounding neighborhood. Spatial autocorrelation of soil NO₃-N concentrations explained 49% of variation among desert sites but was absent between urban sites. We suggest that inorganic soil N concentrations are controlled by a number of ‘local’ or ‘neighborhood’ human-related drivers in the city, rather than factors related to an urban-rural gradient.     

LOG-PERIODOGRAM ESTIMATION OF LONG MEMORY VOLATILITY DEPENDENCIES WITH CONDITIONALLY HEAVY TAILED RETURNS

Many recent papers have used semiparametric methods, especially the log-periodogram regression, to detect and estimate long memory in the volatility of asset returns. In these papers, the volatility is proxied by measures such as squared, log-squared, and absolute returns. While the evidence for the existence of long memory is strong using any of these measures, the actual long memory parameter estimates can be sensitive to which measure is used. In Monte-Carlo simulations, I find that if the data is conditionally leptokurtic, the log-periodogram regression estimator using squared returns has a large downward bias, which is avoided by using other volatility measures. In United States stock return data, I find that squared returns give much lower estimates of the long memory parameter than the alternative volatility measures, which is consistent with the simulation results. I conclude that researchers should avoid using the squared returns in the semiparametric estimation of long memory volatility dependencies.     

谈大学英语四级考试与学生英语能力的提高

大学英语四级考试有着很强的权威性与可信度,但其负面影响越来越突出,尤其是学生英语能力并没有根本上得到提高。本文从学生、教师、大学英语管理考核层三个方面来论述如何提高我国学生的外语能力,以便适应新世纪大学英语教与学的需求。     

林长民与五四运动--兼论五四运动的起源

五四运动爆发之前 ,在国内各派政治势力围绕着“铁路统一案”与“山东问题”的斗争中 ,林长民起了很大的作用。他先是致力于铁路统一案之提出与实施 ,继而力主把青岛问题与胶济铁路及其延长线济顺、高徐两路联系起来 ,之后又运动拒签和反对与日直接交涉。从整个过程来看 ,林长民与五四运动之发生、发展关系密切。从中也可以看出 ,五四运动虽因外交问题而起 ,但其中杂有许多内政的因素。五四运动既是社会变动和文化变化的结果 ,也是当时各派政治势力分化互动的结果     

“五四”精英与唯物史观在中国的传播和发展

唯物史观在中国的传播是由“五四”精英最早启动的，其中李大钊是先驱者，陈独秀影响力最大，李达是集大成者。随着中国共产党的成立及其革命的实践，“五四”精英在传播唯物观的同时也积极探索用唯物史观分析和指导中国的革命实践，取得了积极成果。“五四”精英传播和发展唯物史观给我们以深刻的启示，包括必须充分认识到唯物史观在指导中国革命建设中的重要地位、把传播与发展统一起来以及结合中国实际来传播和发展等。