稻纵卷叶螟实验种群模拟模型

通过5种温度处理(19℃,22℃,25℃,28℃和31℃),探讨稻.卷叶螟实验种群的数量动态.25℃度温度处理组的世代存活率最高(19.7%),种群增长指数最大(14.9倍)。上述两项指标最低的是19℃温度处理组,分别为3.59b和1.18.根据实验结果,组建了该虫实验种群生命表,并建立了模拟种群数量变化的连续模型和等龄期结构的矩阵模型。     

南海季风低压的活动及其降水分析

本文对1973～1986年在南海生成的季风低压的时空分布、路径及其降水特征等进行了统计分析和天气学研究。选择1986年6月下旬和1985年8月中旬两个季风低压过程,对其物理量作了计算,讨论了季风低压登陆后各物理量对降水造成的影响。     

南非现行小学英语课程标准及课程评价

在21世纪,英语作为一门全世界广泛应用的工具性语言,其重要作用不言而喻。作为英 国曾经的殖民地,英语是南非的官方语言,故在英语教育方面应该有值得我们借鉴之处。从课程标 准的框架、目标、内容和评价方面对南非小学英语课程标准进行分析研究,可以发现其课程标准设 置详细全面,课程标准语言表述具有良好的可操作性,且可选择学习不同的语言,这对进一步完善 我国小学英语课程标准设置具有一定的启示意义。     

陕北黄土高原土地生产力与人口适宜容量研究

陕北黄土高原土地生产力及人口容量研究是关系到该地区今后如何发展的重要问题。本文在划分陕北为3个农业生态区基础上，提出了一套简洁而实用的土地分类方案对应产量估算模式，进行区域土地生产潜力和人口容量分析。指出了陕北人地关系的基本态势和调控策略。     

秦汉时期编户民对皇权的崇拜和依附

秦汉编户民直隶国家,其土地、官爵、财产均来自皇权,这是他们皇权崇拜的基础。皇帝、朝廷、官府,具有超阶级性,其对贵族、官僚、豪强的抑制、打击是为了维持小农经济。编户民对皇权的崇拜和依附,与统治者一统化思想控制有关。统治者神化皇权,搞天人感应,是由于民间本身就有神鬼观念和深厚的敬天祀鬼传统,这是统治者天命、符瑞、谶纬、五德转换、皇权神授等等宣传有效的基础。皇权既神授又可及,这与家国同构、君父相连、忠孝一体的文化特点有关。     

论赋学与楚辞学的分合

本通过对本的编辑,献目录对作品的分类收录以及古代论对体的分类评述等三方面考察,认为赋学与楚辞学自南朝萧梁时期开始分离,各自朝不同方向发展。同时,又通过分析楚辞学对骚赋的看法及赋学的“祖骚宗汉”说,认定二学虽分开而并未完全分离,其间自有相关的连结。因此赋学与楚辞学是既有区别又联系紧密的两门学问,都是中国学批评史所不可缺少的重要组成部分。     

论唐中后期南衙对北司的依附

唐代南衙泛指以宰相为首的朝官集团，北司是指以神策军中尉和内枢密使为首的宦官集团。两大集团势力的消长对唐中后期政治格局产生了深远的影响。由于北司势力的膨胀和南衙势力的削弱，导致南衙对北司的依附，使唐中后期外朝士大夫集团对宦官势力的制约大大削弱，是宦官专权局面得以长期延续的重要原因之一。     

Learner pregnancy in South Africa’s Eastern Cape: The Factors affecting adolescent girls' school withdrawal during pregnancy

An early pregnancy often puts an end to a girls’ education. However, few studies have investigated which factors affect adolescents’ school discontinuation during pregnancy. This study interviewed 1,046 adolescent mothers from the Eastern Cape province in South Africa. The results showed that a quarter of school-going adolescent girls withdrew from school during the pregnancy - many as early as the first trimester. School withdrawal was associated with higher poverty, higher grade repetition, an unplanned and unwanted pregnancy, and greater lack of information about the pregnancy. Given the high enrolment rates at the onset of the pregnancy, school-based services may provide an opportunity to identify which girls require substantial support to remain in education throughout pregnancy, using a history of poor school performance as an indicator for dropout.     

万寿竹六个居群的核型研究

本文研究了在云南境内的万寿竹Disporum cantoniense (Lour．)Merr．从滇东南经滇中到滇西 北不同居群间的核型变异。该种的染色体数目较为稳定，2n=14，没有观察到不同数目的变异。六个 居群的不对称性均属于3B型，但各个居群的核型结构表现出一定的差异，核型间随体位置和数目的不 同以及同源染色体的杂合性是居群间变异的主要特征，这种种内不同居群间核型的变异或许与该种的地理分布及生境有一定的相关性。     

Antioxidant and lipid lowering activities of Indian black tea

Indian black tea; CTC leaf and dust, produced by Tata Tea Limited, Kolkata, (India) was studiedin vitro as potential scavenger of oxygen free radicals. Super oxide anions were generated in a system containing xanthine—xanthine oxidase (enzymic system) and by NADH- phenozine methosulphate (non enzymic system). Anions were assayed in terms of uric acid formation and reduction of nitroblue tetrazolium salt, which were shown to be suppressed by tea extracts. Extracts from both leaf and dust also inhibted the formation of hydroxyl radicalsin vitro in the enzymic system comprising hypoxanthine—Cu⁺²—sodium ascorbate and xanthine oxidase and in non enzymic system of deoxyribose—Cu⁺²—sodium ascorbate and H₂O₂ as well as the Cu⁺² induced lipid peroxidation in human low density lipoprotein. Feeding with black tea in normal rats for sixty days increased their antioxidant activity and their liver microsomes were shown to be protected against peroxidation of lipids as stimulated by metal ions with enzymic or non enzymic reactants. Furthermore feeding with tea extracts in normal as well as triton WR—1339 induced hyperlipidemic rats caused decrease in their plasma levels of total cholesterol, phospholipids and triglycerides. The antioxidant and lipid lowering activities of both extracts from CTC leaf and dust tea was comparable and may be due to the presence of natural products like catechin and others.