中国当代人口发展分析

以人为本的科学发展观必然要求我们在一切发展序列中首先关注人口发展,中国人口发展在中国社会发展框架中具有绝对优先的工具价值和目的意义.中国作为发展中国家与作为人口最多的国家两者之间在很大程度上具有互为因果的内在关系,充分认识中国人口发展现状具有多元化的重要意义.中国人口发展状况主要表现为人口数量多、人口质量低和人口结构不合理.中国人口现代化是中国其它现代化的强力引擎,中国人口发展的基本创新路径是城市化发展路径、市场化发展路径、民主化发展路径.     

人均耕地资源对农业集约经营的影响

从农业生产的历史发展趋势、定性和实证等 3个方面分析 ,认为人均耕地资源是影响农业集约经营的重要因素 ,人均耕地资源的减少在一定条件下将促进农业集约经营水平的提高。     

论马克思主义发展的动力机制

从人类实践活动、人类社会发展不同历史阶段时代背景、时代特征、时代要求和时代主题的差异性、马克思主义自身的理论品质、马克思主义政党及其政治领袖们关于理论建设的自觉性和创新精神等几个方面论述了马克思主义发展的动力机制。     

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.     

生物多样性保护与知识产权

生物多样性保护与知识产权存在较大的关联性,《生物多样性条约》的相关条款与知识产权密切相关,围绕生物资源保护与利用的知识产权理论不断发展,我国的相关法律制度也应加以完善。     

沈阳市老年人口现状及其养老保障模式的构建

沈阳作为一个重工业城市 ,在其二次创业过程中人口老龄化问题日益突出 ,因此 ,掌握沈阳市老年人口的生活状况 ,构建适合沈阳市老年人口现状的养老保障模式 ,已经成为沈阳市社会养老保障体系改革的重要内容。     

"离农"与韩国农业的现状

韩国自 194 5年独立到 1999年间 ,伴随着工业化的高速进展 ,农村人口也大量流失 ,占总人口的比重由 70 %下降到 9%,使得目前的农村劳动力严重不足与老龄化。人口的减少与剧烈的两极分化 ,使出租地增加到总耕地面积的 4 0 %以上 ,而且基本上是土改前租佃关系的翻版 ,不利于机械化与生产效率的提高。由于农业危机 ,韩国政府希望通过建立股份化的农场 ,使农业生产规模化、现代化 ,并为此做了很多努力 ,但进展不太顺利。     

可持续发展与人口老龄化

从人口自身来讲 ,一是数量要适度 ,二是素质要提高 ,三是结构要合理。人口应始终保持与系统其他要素的协调而不断调整自身的数量、质量与结构。老年人共享社会经济发展成果是实现可持续发展的重要条件 ,文章从 4个方面展开论述 :正确评估老年人创造社会财富的突出贡献 ;充分肯定老年人在发展文教、科技等各项事业中不可替代的巨大作用 ;不要忘记老一代为推动社会进步所付出的沉重代价 ;公平体现老年人一生的社会价值。     

Race and Population Change: A Longitudinal Look at Cleveland Neighborhoods

This paper investigates the relationship of racial composition to neighborhood population change from 1910 to 1990 in the Cleveland metropolitan area. To better understand the long-term dynamics of urban neighborhood change, we focus our analysis upon the longitudinal relationship of race, socioeconomic status, and life cycle stage to changes in neighborhood population densities. First, we find that the more established neighborhoods of the African-American community have experienced dramatic declines in population since 1950, a pattern that represents a clear change from the earlier part of the twentieth century. Second, population loss is experienced through a variety of mechanisms, including the demolition of dwellings, the increase in housing vacancy, and the decline of household size. Third, much of this population loss should be interpreted within the context of high economic distress, occurring most frequently in older African-American communities. Over time, economic distress appears to be more important than race in and of itself in leading to the loss of neighborhood populations.