Study on student administration ruled of law in public colleges and universities

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论独立学院学生培养质量保障体系的构建

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Investigation of Causes for Undergraduates' Changing Their Majors in Universities

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The characteristics of American community college and its enlightenment to the development of higher vocational and technical education in China

作为美国社区学院主要职能之一的职业教育在社区学院的百年历史中发挥了举足轻重的作用。本文追述了职业教育的发展历史,分析了职业教育在课程设置、教学方法和师资建设等三个方面的特色,探讨了社区学院职业教育对我国高等职业技术教育的启示。Vocational education,as one of most important function of American community college,has played a significant role in its one hundred years development.This paper traces the history of vocational education,analyses its characteristics in curriculum setting、teaching method and teacher management,lastly discusses its enlightenment to higher vocational and technical education in China

麻峪口赤铁矿成因浅析

河北省怀来县麻峪口属宣龙式水成沉积铁矿床，后经区域性轻微变质而成磁铁矿，本矿床中存在大量的赤铁矿，通过对矿区地质特征、开采生产地质情况等较为细致研究，进而提出麻峪口赤铁矿的形成是受深部及周边燕山期花岗岩侵入体、断裂构造发育及有机碳等影响。</jats:p

Species Composition and Abundance Distribution of Meso- and Micro-copepods and Their Relationships with Environmental Factors During Dry and Wet Seasons in the Pearl River Estuary

中小型桡足类是河口区浮游动物的重要组成部分.根据珠江口枯水期(2013年11月)和丰水期(2014年8月)24个站位的调查资料,对中小型桡足类种; 类组成、丰度分布和优势种等特征进行了研究.枯水期和丰水期中小型桡足类分别出现60和40种,以河口和近岸类群为主.根据表层盐度变化将珠江口分为Ⅰ、; Ⅱ、Ⅲ区,桡足类种类分布具有显著的河口特征,枯水期和丰水期盐度均为Ⅲ区>Ⅱ区>Ⅰ区.相关性分析结果显示,桡足类种类数与盐度呈极显著正相关.桡足类; 丰度时空分布差异显著,丰水期(10 809. 05 ind/${{\rm{m}}^{\rm{3}}}$)显著高于枯水期(1 371. 20; ind/${{\rm{m}}^{\rm{3}}}$),且在2个水期均以I区丰度最高.强额孔雀哲水蚤(Parvocalanus; crassirostris)和中华异水蚤(Acartiella; sinensis)在2个水期均为主要优势种,其空间分布亦与盐度密切相关.研究结果表明盐度是影响珠江口中小型桡足类种群结构的关键非生物环境因子.Meso- and micro-copepods are the major species of estuarine zooplankton.; Based on investigations of 24 stations in the Pearl River Estuary in; November 2013 (dry season) and August 2014 (wet season),the species; composition,abundance distribution and dominant species of meso- and; micro-copepods were studied.Results showed that there were 60 and 40; copepod species identified in the dry and wet season,respectively,mostly; belonging to the estuarine and neritic groups.In our study,the Pearl; River Estuary was divided into three regions according to its surface; salinity.The Distributions of species number in both dry and wet seasons; were Region Ⅲ >Region Ⅱ >Region I,displaying a remarkable characteristic; estuarine distribution.The species number of copepod was significantly; correlated with salinity.The abundance of copepod was found varying with; time and geographic locations.The average copepod abundance in the wet; season (10 809. 05 ind/${{\rm{m}}^{\rm{3}}}$) was much higher than in; the dry season (1 371. 20 ind/${{\rm{m}}^{\rm{3}}}$), and in both; seasons Region I had the highest copepod abundance.Moreover, the two; copepods of Parvocalanus crassirostris and Acartiella sinensis were; found dominant in both seasons,and their distributions were; significantly correlated with salinity.In conclusion,salinity was the; key abiotic factor influencing copepod population structure in the Pearl; River Estuary.广东省渔业生态环境重点实验室2015年开放课