对我国证券投资基金发展问题的探讨

从证券投资基金的现状出发 ,针对基金发展中的典型问题 ,进行了多角度的思考 ,提出了一些前瞻性的建议     

蒸馏沉淀聚合法制备单分散交联聚苯乙烯微球

以乙腈为溶剂,以过氧化二苯甲酰(BPO)为引发剂进行了苯乙烯(St)和二乙烯基苯(DVB)的蒸馏沉淀共聚合研究,制得粒径2-3μm的单分散交联聚苯乙烯微球.结果表明,当单体总量和BPO用量增加时,微球粒径增大,产率升高.当交联剂DVB用量增加时,微球平均粒径增大,粒径分布变窄,产率升高.随着混合溶剂中乙醇含量的下降,粒径分布变窄,产率升高.在其他条件基本相同的情况下,用长分馏柱所得的聚合物微球具有较好的形貌.     

Poverty Dynamics among Recent Immigrants to Canada1

This paper examines two issues: (1) poverty dynamics among successive cohorts of entering immigrants to Canada, and (2) whether rising educational attainment and increasing share in the “skilled” class since the early 1990s has resulted in improvements in poverty entry, exit, and chronic poverty. The entry to poverty is very high during the first year in Canada, but low in subsequent years. The dramatic move toward more labor‐market friendly characteristics of entering immigrants had only a very small effect on poverty outcomes, in part because the relative advantage of holding a degree diminished, and “skilled economic” class immigrants were more likely to enter poverty than their “family” class counterparts.     

应用莫尔条纹法测定人体腰椎后关节三维位移量

应用莫尔条纹原理,测定人体离体腰椎三维运动时后关节的相对位移量,探索运动的角度、载荷和位移的相互关系,是直接研究关节运动学的一种简便有效方法。本文提供的实验结果对于研究腰椎后部结构的生理和病理功能具有重要的临床意义。     

烟草抗赤星病诱导中激发子对烟草几丁质酶、β-1,3-葡聚糖酶的诱导作用

研究了激发子对烟草抗赤星病的诱导作用及诱导烟草几丁质酶、β－１，３－葡聚糖酶的积累情况．结果表明（１）激发子诱导后使烟草抗赤星病的能力提高５５．１３％，比水杨酸诱导效果低２１．８６％；（２）激发子诱导的β－１，３－葡聚糖酶和几丁质酶有明显的体外活性，二者单独使用时，酶活性单位分别为１．１６４和０．３１５ｕ，但二者混合作用时，酶的活性明显下降，活性单位分别为０．１２４和０．０５ｕ；（３）ＰＡＧＥ电泳显示，经激发子诱导后ＰＲ蛋白表达量远远超过对照，但比水杨酸诱导积累弱．可见，ＰＲ蛋白、β－１，３－葡聚糖酶、几丁质酶的积累与抗病诱导效果呈一致趋势，表明激发子诱导的烟草抗赤星病的作用可能与ＰＲ蛋白积累及这两种酶的诱导表达有关．     

道德教育个性化的当代解读

揭示道德教育个性化的当代语境,运用马克思主义个人观,分析道德教育个性化的真实内涵,进行道德教育个性化的架构,以期实现道德教育个性化的应有价值。     

稀土对材料强韧性的影响及细观机理探讨

通过对钝切口小试样在扫描电镜下的加载观察与分析，认为稀土Ce能较大幅度地提高Al－Mg－Si变形铝合金的起裂COD值。细观分析表明，与平面应变断裂情况不同，稀土不是通过影响粒子形态进而对裂纹产生屏蔽效应来提高材料的宏观断裂性能，而主要是强化了晶界，迫使裂纹转向晶内并在裂尖产生较大的塑性变形，消耗更多的能量。     

Farmers’ adaptability to the policy of ecological protection in China—A case study in Yanchi County,China

Due to long-term human activities, grassland ecosystems have been severely damaged. To protect grassland ecosystems, the prohibited grazing policy (PGP), a grassland ecological protection policy, was instituted for Chinese grasslands in 2002. However, it is unknown whether farmers have effectively adapted to the PGP. The adaptability of farmers to this policy has directly influenced the effective implementation of the policy and the sustainable development of the ecosystem. Previous research on adaptability has not focused on the adaptation to political change. This article uses a case study in Northwest China to investigate the adaptability of farmers to the policy. First, we study the restoration status of ecosystems. In addition, this paper studies the perceptions regarding farmers’ adaptability to the policy and explores the adaptation strategies of different types of farmers. Finally, this paper discusses the main factors that influence farmers’ choice of adaptation strategies. The implementation of the PGP has achieved remarkable ecological benefits. Farmers of different types had different adaptation perceptions, and their choices of adaptation strategies also varied. In addition to the farmers’ perception of the policy, the main factors that influenced farmers’ adaptation strategies also included livelihood capital.     

艺术创意的设计素描

设计素描还没有明确的界定 ,但它具有艺术想象、塑造新的形象、设计素描者的“心中的画”的特点和内涵 ;要使设计素描有创意 ,就应该有理性的结构、构图和取于自然物的素材 ,并正确地运用点、线和面的组合     

具有迟滞的Volterra方程的周期解分歧条件

本又给出方程其中R，γ，α，β，δ，σ为非负常数，出现周期解分歧现象条件．