北方高寒地区塑膜暖棚育肥蒙古羊试验

对25岁淘汰蒙古羊进行了50天的冬季暖棚育肥试验,取得了显著的育肥效果。通过舍饲,试验组羊只期末体重4557kg,期增重686kg,平均日增重0137kg,分别比对照组的3973kg、127kg、0069kg多584kg(P<001).559kg(P<001).0068kg(P<001).试验组羊只胴体重、净肉重、净肉率、屠宰率均极显著或显著高于对照组。经核算试验组每只比对照组多收入2668元。     

Quality of Post-1965 Asian Immigrants

The reliance on an overall average approach to the labor market quality of immigrants could generate misleading information and biased policy recommendations. Focusing on Asian immigrants, this article demonstrates that much insight into immigrant quality can be gained via a diversity approach. Using the 5% PUMS data of the 1990 U.S. census, this paper shows that a common perception that the quality of post-1965 immigrants is lower than natives and earlier immigrants is invalid for post-1965 Asian immigrants. Unlike their Latin American counterparts, post-1965 Asian immigrants are generally more educated and skilled than natives. The educational level of post-1965 Asian immigrants surpasses that of their pre-1965 counterparts, despite their disadvantage in occupational attainment due to their shorter time of adaptation. Diversity also characterizes educational and occupational attainment across major post-1965 Asian immigrant groups and within each Asian immigrant group before and after 1965. Gender does not alter the advantage of post-1965 Asian immigrants over natives and their pre-1965 parallels in education, but it does complicate their occupational status. Policy implications of the findings are considered.     

Preference in flower visits and partitioning in pollen diets of stingless bees in an Asian tropical rain forest

Floral resource partitioning among stingless bees (Trigona, Meliponini, Apidae) in a lowland rain forest in Sarawak, Malaysia, was investigated using tree towers and walkways in a 4-year study that included a general flowering period. We obtained 100 collections of insect visitors to flowers of varying floral location and shape representing 81 plant species. The tendency of 11 species of stingless bees to visit specific flowers with a particular floral location and shape was analyzed by logistic regression analysis. This analysis showed that the proportion of flower visitor collections containing Trigona fuscobalteata and T. melanocephala differed according to floral location. The former was frequently collected at canopy and gap flowers, whereas the latter was most often collected at understory flowers. The analysis also suggested that T. erythrogastra was more rarely collected at shallow flowers than at deep flowers. Analysis of the pollen diets of T. collina, T. fuscobalteata, T. melanocephala, and T. melina revealed that similarity of pollen sources differed among the six permutated pairs of the four species. The lowest mean rank of similarity found was between T. fuscobalteata and T. melanocephala. This result supports the hypothesis that preference in visiting flowers in different locations leads to pollen resource partitioning. Received: May 14, 1997 / Accepted: April 23, 1999     

第三部门的兴起:理论假设检视和现实原由分析

论文在对第三部门兴起的理论假设进行检视的基础上,对第三部门兴起的现实原由进行分析,认为第三部门浪潮是在全球化浪潮、新公共管理运动、政府失灵以及通讯技术和教育水平提高等现实因素的共同推动下形成的。第三部门的兴起是具有必然性的现象,对发展中国家的发展具有积极的意义,发展中国家应该积极应对。     

日本邮政民营化改革及其启示

20世纪80年代以来,随着世界范围通讯技术的进步以及新公共管理运动的兴起,国家垄断经营形式下邮政事业所存在的弊端逐渐显现,邮政改革成为波及世界范围的改革潮流。当前,我国正处于邮政改革的关键时期。他山之石,可以攻玉。日本在邮政事业改革中面临的问题与我国现阶段有很多类似之处,研究日本邮政事业所面临的问题,以及邮政民营化改革中的制度设计、基本方针、具体步骤和措施等,对干完善我国的邮政体制改革具有一定的启示和借鉴意义。     

基本养老保险覆盖面扩展决定因素实证研究

扩大基本养老保险覆盖面是我国社会保障制度改革的优先目标之一。本文通过对19982003年分省数据的实证分析,发现各省之间的基本养老保险覆盖面的差异,主要是由它们的经济发展水平和市场化程度这两个宏观经济因素与基本养老金给付标准和财政对社会保障补助支出这两个政策因素共同决定的。基于这些发现,考虑到我国经济持续发展和市场化改革深化的趋势,我们对我国社会保障事业的发展持谨慎乐观的态度,并认为在目前,“低水平、高覆盖”仍然是一个符合国情、必须坚持的合理政策选择,地方政府应当在财力许可的范围内,增加对社会保障事业的财政投入。     

澳门财政支出特点分析和建议

澳门回归8年来,博彩旅游业蓬勃兴旺,带动澳门整体经济快速发展,位居亚洲城市之首。但是,澳门属于微型经济,而且特殊的产业结构注定存在许多隐性的社会矛盾。当经济获得发展以后,政府应投放更多的精力和资源解决民生问题,减少博彩业带来的社会成本。所以,如何通过优化财政支出结构,弥补市场缺陷,增加医疗、卫生、教育等公共产品,令澳门市民分享经济发展带来的成果,是特区政府未来需要面对的重大挑战。     

对我国上市公司会计信息披露相关问题的探讨

上市公司及时、真实、充分地向广大投资者披露会计信息是它必须履行的义务,但目前我国的上市公司并没有很好的履行这个义务。文章采用实证分析、案例分析、规范分析的研究方法,从信息披露存在的问题入手,针对问题分析其背后的原因,以此探讨解决问题的对策。     

考虑脉冲现象的复杂供应链系统及其稳定策略

供应链系统是一个复杂的系统,一方面由于时间延迟、信息不对称及反馈机制等,会产生牛鞭效应,另一方面供应链具有需求突增或骤减的脉冲特点,上述现象都可能导致供应链系统混沌,而现有的供应链模型仅考虑了“牛鞭效应”,并未考虑脉冲现象对供应链系统的影响。文章建立了考虑脉冲现象的供应链模型,分析了脉冲现象对供应链系统的影响,并给出了使供应链系统稳定的策略,讨论了参数扰动对该模型的影响,通过数值算例验证了稳定策略的有效性。研究发现:脉冲现象对供应链系统有着显著影响,但只要选取恰当的脉冲强度和脉冲时间间隔,供应链系统是可以稳定的。     

寂寞与冷清——20年来张天翼小说研究述评

自20世纪80年代末期以来的近20年中,张天翼小说研究关注的焦点主要集中在作品研究、艺术研究、比较研究、文学史定位等方面.虽然在研究的个性化与多元化方面有一些拓展与深入,但是评论界对张天翼的关注显然不够,论题重复、视角单一、创见贫乏使研究陷入徘徊、停滞不前的状态,张天翼研究面临着危机.期待在新世纪里研究者能够激发出创造性,开拓张天翼研究的新境界和新领域,使张天翼小说研究向纵深处掘进.