简述珞巴族社会生活的变迁

本文通过对米林县南伊珞巴民族乡的深入调查,叙述西藏民主改革以来珞巴族在社会、政治、经济、文化上发生了巨大的变化,珞巴人民的生产、生活状况、居住条件、医疗卫生状况等各项事业取得了前所未有的进步和发展。     

“变”在三角函数中

三角求值、化简、证明是三角的主要题型,在所有的三角问题中,以“变”为主线,通过一系列的“变角”、“变次”、“变次”、“变结构”等方法枣解决问题。     

2000-2010年黑龙江省中小学贫血检出率动态变化趋势

运用专家访谈、数理统计等研究方法,以黑龙江省2000年、2005年、2010年城乡中小学生为调研对象,分析中小学生贫血检出率动态变化趋势,讨论缺铁性贫血对中小学生的危害,并对存在的问题提出建议,为改善中小学生缺铁性贫血问题提供有效数据,同时也为中国学生体质与健康研究组提供可靠数据。     

Social changes in youth sports participation styles 1969–1999: the case of Flanders (Belgium)

Three issues are put forward with respect to the active participation of young people in leisure-time sports styles. It is considered (a) whether sports participation styles can be detected over the last three decades, (b) whether they have changed in this period of time, and (c) whether traditional parameters understood as structuring and positioning young people's lifestyles are still relevant with respect to their sports participation preferences. Youth sports participation data were retrieved from four large-scale surveys in 1969, 1979, 1989 and 1999 (N_total=22,424 high school boys and girls). These data allow for a time trend analysis of youth sports participation styles. Results from component and regression analyses indicate that different participation styles can be distinguished for each period of time and that these styles have been developing and differentiating through a growing responsiveness to wider social trends. Structural and positioning variables such as age, sex and education remain significant determinants for young people's active participation in leisure-time sports styles over the observed period of time. Although these social structures continue to shape youth sports participation styles, it is suggested that there is more variety within social groups than among social groups partially due to processes of individualisation and homogenisation.     

可自我实施的农产品交易平稳关系契约研究

龙头企业与农户间的农产品交易本质上属于长期合作关系,双方有效合作的基础是能够为合作双方提供长期有效的激励、降低违约风险的可自我实施契约。在界定农产品交易平稳关系契约的基础上,对在农户存在专用投资、龙头企业具有全部事后谈判力量的情形下,农产品交易最优平稳关系契约的可能形式进行分析,结论表明:最优平稳关系契约形式与双方的贴现因子、双方持续合作的概率、农户的事前和事后保留收益有关;最优的激励计划严格依赖于龙头企业承诺向农户的支付与农户的事前保留效用及事后保留效用之间的对比关系,这种对比关系使农产品交易关系契约的运行效率不再与剩余分配状况相关。     

服务质量和感知价值对服务忠诚的影响——基于餐饮业和细分维度的探索

以餐饮业为调研对象,用结构方程方法探索服务质量和感知价值的细分维度对服务忠诚的影响。研究表明:服务质量的各细分维度对于服务忠诚的影响大多都是通过顾客感知价值的各个细分维度作中介来实现的,对服务忠诚具有直接影响的服务质量因素只有安全性因素;服务质量的移情性维度对感知价值的各维度均具显著影响,有形性维度对感知价值的价格、质量和社会维度具有积极的影响,可靠性维度与感知价值的情感维度相关,响应性维度与感知价值的情感和质量维度相关;感知价值除质量维度外,社会、情感、价格维度均对服务忠诚具有显著影响。因此,餐饮业企业应特别重视服务人员与顾客进行良好的人际互动,促进与顾客的情感交流,把向顾客提供高价值的服务作为提升服务忠诚的有效途径。     

工程监理的信息经济学分析

本文关注监理双重角色和开发商主动披露信息自发需求不足的问题,并从信息经济学的角度,对监理市场的供求进行分析.指出监理质量提高的关键是提高P或收窄P1 ＞P＞P2的区域,即与开发商是否利用信息不对称盈利有关;各种监管力度无法充分反映建筑物最终用户的需求时,P只可能在P2附近摆动,监理市场帕累托改进就无法实现.     

An Investigation of Effectiveness of Conceptual Change Text-oriented Instruction on Students' Understanding of Solution Concepts

This study investigated the effect of conceptual change text-oriented instruction over traditional instruction on students' understanding of solution concepts (e.g., dissolving, solubility, factors affecting solubility, concentrations of solutions, types of solutions, physical properties of solutions) and their attitudes towards chemistry. The sample of this study consisted of 87 undergraduate students from two classes enrolled in an introductory chemistry course. One of the classes was assigned randomly to the control group, and the other class were assigned randomly to the experimental group. During teaching the topic of solution concepts in the chemistry curriculum, a conceptual change text-oriented instruction was applied in the experimental group whereas traditional instruction was followed in the control group. The results showed that the students in the experimental group performed better with respect to solution concepts. In addition, it has been found that there was no significant difference between the attitudes of students in the experimental and control groups towards chemistry.     

文明传承的非稳定性特征——关于辽西考古文化演替规律的思考

从辽西考古化的空间分布、聚落遗址的规模形态、生产工具的组合特点及演替规律中可以看出，该地区新石器时期以来化发展受生产经济形态转变的非稳定性特征的影响。环境条件特别是气候条件是影响辽西地区早期化发展的本质因素。气候温暖期，定居的农业化昌盛，气候寒冷期，只能维持低水平的简单畜牧经济。造成新石器时代一青铜时代该地区产生经济形态转变和化倒退的直接原因是5000aB．P．-4000aB．P．降温事件及铁器冷期寒冷气候的作用。环境因素的剧烈波动过程阻碍了该地区化与生产经济形态的正常演进与发展。