Silphids in urban forests: Diversity and function

Many ecologists have examined the process of how urbanization reduces biological diversity but rarely have its ecological consequences been assessed. We studied forest-dwelling burying beetles (Coleoptera: Silphidae)—a guild of insects that requires carrion to complete their life cycles—along an urban-rural gradient of land use in Maryland. Our objective was to determine how forest fragmentation associated with urbanization affects (1) beetle community diversity and structure and (2) the ecological function provided by these insects, that is, decomposition of vertebrate carcasses. Forest fragmentation strongly reduced burying beetle diversity and abundance, and did so far more pervasively than urbanization of the surrounding landscape. The likelihood that beetles interred experimental baits was a direct, positive function of burying beetle diversity. We conclude that loss of burying beetle diversity resulting from forest fragmentation could have important ecological consequences in urban forests.     

对培养学生英语自主学习能力的实践与思考

分析了由于长期的应试教育带来学生自主学习的能力较差的状况,结合英语教学实践,提出通过培养学生预习习惯,改变学生对学习英语的态度,引导和教会学生阅读技巧及方法,激发学生阅读兴趣,从而提高他们的阅读速度和阅读理解能力,促进自学能力的提高。     

South African Indian migration in the twenty-first century: towards a theory of ‘triple identity’

This paper is inspired by three issues, namely ongoing research on South Africans of Indian origin, the anecdotal evidence that accumulates through ongoing discussions on a casual level with such people and the increasing interest among researchers about how globalization and transnational movements are impacting upon identity formation among minorities who are seeking employment or a new life in the developed economies of the ‘big five’ English-speaking countries, i.e. the USA, Canada, Australia, New Zealand and the UK. It is in countries such as these that a third identity emerges and develops to instill a sense of triple identity. The information here suggests that, when people of Indian origin migrate to one of these countries, they continue to cling to South Africa because it is their country of birth, as well as to India, more for sentimental rather than practical reasons. The topic of this paper reflects a contemporary phenomenon not just among the Indians in South Africa, but also among other diasporas such as Chinese in Latin America, whose new and final emigration destination always seems to be the US. In addition, people of Chinese origin in the countries of Indochina, such as Vietnam, Laos and Cambodia, experienced similar patterns of becoming diasporas in Europe, North America and Oceania in the 1970s. However, migration implores them to renegotiate their identities in order to adapt and settle in accordance with their newly adopted host territories. This gives rise to an identity that straddles three countries, which induces the need to examine new ways of identity building in a global transnational economy.     

迁徙自由与户籍管理改革

迁徙自由的权利是基于人类固有尊严而应为人人所享有的,以《中华人民共和国户口登记条例》为依据的中国户籍制度在事实上将这项权利取消了。这种户籍管理制度所产生的不公平及对我国市场经济的发展造成的不利影响不容小视,所以当前改革户籍管理制度,确认并设立公民的迁徙自由权利显得必要而迫切。     

城市规划公众参与初探

在公众参与城市规划理念产生背景的基础上,简要回顾了国外公众参与理论,介绍了我国公众参与的影响因素及现状,提出了公众参与实现的三个方面的转变及公众参与的三个促进机制,论述了公众参与存在的几个问题及应对措施.     

我国现代乡村旅游深层次开发探讨

“回归自然 ,返朴归真”已成为当今世界旅游的主题。作为生态旅游重要组成部分的现代乡村旅游正顺应了现代旅游的这一需求 ,并迅速走俏国内外。本文从我国现代乡村旅游及其开发意义入手 ,分析了我国这类特种旅游的开发现状和存在的问题 ,并就开发中应注意的几个问题进行了探讨     

加入WTO对西部高校人才资源的影响与对策

加入WTO后,人才的竞争将更加激烈。作为人力资源集中且承担着为西部大开发培养高级人才的西部高校,急需转变观念,深化改革,营造有利于人才成长的机制和环境,造就高素质的教师队伍。     

商品经济是农村合作经济组织发展的重要条件

当前农村合作经济组织的兴起和蓬勃发展不是孤立的社会现象,而是农民在商品经济条件下的理性选择.一方面,合作经济组织是商品经济发展的必然要求;另一方面,正是由于商品经济的发展创造和拓展了合作经济组织的生存空间.     

海上救助公约的发展及其主要影响

1989年通过的国际救助公约对传统的“无效果无报酬”原则所作的例外规定,引起了海运界和贸易界的极大关注,从而导致某些国际规则和国内法的修订。本文运用比较的方法对海上救助公约的发展及其对英国劳氏标准救助契约、国际共同海损理算规则和我国海商法的影响作了论述,并且提出了我国当前海商法应作修改补充的几点建议。     

Potential exposures and risks from beryllium-containing products.

Beryllium is the strongest of the lightweight metals. Used primarily in military applications prior to the end of the Cold War, beryllium is finding new applications in many commercial products, including computers, telecommunication equipment, and consumer and automotive electronics. The use of beryllium in nondefense consumer applications is of concern because beryllium is toxic. Inhalation of beryllium dust or vapor causes a chronic lung disease in some individuals at concentrations as low as 0.01 microg/m3 in air. As beryllium enters wider commerce, it is prudent to ask what risks this might present to the general public and to workers downstream of the beryllium materials industry. We address this question by evaluating the potential for beryllium exposure from the manufacturing, use, recycle, and disposal of beryllium-containing products. Combining a market study with a qualitative exposure analysis, we determine which beryllium applications and life cycle phases have the largest exposure potential. Our analysis suggests that use and maintenance of the most common types of beryllium-containing products do not result in any obvious exposures of concern, and that maintenance activities result in greater exposures than product use. Product disposal has potential to present significant individual risks, but uncertainties concerning current and future routes of product disposal make it difficult to be definitive. Overall, additional exposure and dose-response data are needed to evaluate both the health significance of many exposure scenarios, and the adequacy of existing regulations to protect workers and the public. Although public exposures to beryllium and public awareness and concern regarding beryllium risks are currently low, beryllium risks have psychometric qualities that may lead to rapidly heightened public concern.