GPS定位技术在灌区调查中的应用

GPS定位技术日益成熟,在很多领域已得到了广泛应用。文中主要简介说明GPS技术原理与特点,针对工程实践中调查灌区的实际情况存在灌区面积大、渠系长、渠系建筑物多、渠道实际完成不连续的特点,采用传统的测量方法已无法满足快速而准确的调查要求,因此应用GPS定位技术与之比较,同时也验证了新技术的高效性和准确性。     

水电站安全鉴定现场查勘补充手段的探索研究

本文对水电站安全鉴定的现场查勘进行了从常规手段到补充手段的探索,并从互联网数据参考和现场简易量测两方面,阐述了现场查勘各种补充手段的原理和经验技巧,展望了水利技术跨越式发展的前景。     

GRADIENTS IN THE BIOPHYSICAL STRUCTURE OF URBAN RIVERS AND THEIR ASSOCIATION WITH RIVER CHANNEL ENGINEERING

Urban rivers are often engineered to increase flood conveyance and stabilize channel size and position. This paper analyses habitat surveys of 180 urban river stretches of differing engineering type from four river basins (river Tame, West Midlands, UK; tributaries of the lower river Thames, UK; river Botic, Prague, Czech Republic; river Emscher, North‐Rhine Westphalia, Germany). Kruskal–Wallis tests identify significant differences in extent and/or frequency of flow types, bank and bed physical habitats, and vegetation characteristics associated with different styles of engineering. Principal Components Analysis identifies four key environmental gradients in the data set: sediment supply and retention; extent and diversity of in‐channel vegetation and riparian trees; bed and bank sediment calibre; flow type energy and complexity. These gradients discriminate stretches of differing planform, cross section and reinforcement and are significantly correlated with indices of degree and type of bank and bed reinforcement, pollution and presence of alien nuisance plant species. The analytical results illustrate statistically significant associations between different styles and levels of engineering intervention and the number and nature of physical habitats present in urban rivers. The results provide a basis for filtering sites for potential remedial measures prior to site‐specific surveys and modelling, for comparing sites and for tracking trajectories of change at sites that are subject to changes in channel engineering. They provide evidence that river condition and degree of engineering are not inversely related in a simple linear way, and that engineering of urban river channels, in the form of mixed, patchy reinforcement can contribute a great deal to habitat diversity where other controls on flow heterogeneity are more difficult to manipulate. Copyright © 2011 John Wiley & Sons, Ltd.     

坐标转换在悬高测量中的应用

悬高测量是在目标点底部设置棱镜测量距离,再测定目标点的垂直角,计算出目标点的高程(高度)。但在目标点底部无法设置棱镜,悬高测量就无法进行。为此,文章介绍的悬高测量方法、计算原理和计算公式较好地解决了以上问题。同时讨论了其实际测量中的注意事项。     

大学生志愿服务现状调查与动力机制构建——基于江西部分高校的调查

就大学生志愿服务问题对江西部分高校展开调查,依据调查结果,运用系统动力学方法对大学生志愿服务进行因果关系分析,最后构建出大学生志愿服务的动力机制:完善信息管理系统;健全组织管理体系;构建基础培训和专业培训融合的培训体系;拓展服务活动的深度与广度;制订基于学生需求导向为动机的激励制度;改进经费筹管和法律保护。     

云南大学生体育兴趣及差异调查研究

对云南高校大学生体育兴趣程度及差异现状的调查结果表明：云南大学生体育兴趣总体兴趣程度较好,男女生体育兴趣程度差异明显,少数民族学生与汉族学生、城市生源学生与农村生源学生、独生子女学生与非独生子女学生体育兴趣程度有一定差异,但差异不明显。通过分析和研究大学生体育兴趣及差异的主要表现,提出加强大学生体育兴趣培养的建议。     

城市规划专业留杭毕业生住房情况调查及分析——以浙江科技学院为例

随着中国城市化的快速推进和房价的日益飙升,大学毕业生在刚毕业几年间的住房问题显得越来越突出。现以浙江科技学院近六年城市规划专业本科毕业生为调查对象,结合多种调研方法的综合运用,通过对其居住足迹的跟踪调查,剖析大学毕业生的住房现状和住房困难问题,探讨公共租赁房这一保障性住房的准入机制及理想的区位分布等议题。     

高职高专地籍与房产测量课程教学改革思考

“就业导向、工学结合”已成为高等职业教育人才培养模式改革的重要切入点,这给作为主干专业课程的“地籍与房产测量”教学带来全新的课题.为了构建适应这种新形势的教学模式,分别从教材建设、教学内容、教学手段、实践教学和考试形式5个方面进行了探索.     

U.v. absorbers in sun cosmetics 1978

A comprehensive survey has been carried out to establish which sun-screen agents are used by the cosmetics industry in Holland. During 1978, some 200 cosmetic sun preparations, composed of forty-eight brands, were purchased and analysed to determine which u.v. absorbing compounds were present. Most of those found were identified and quantified by means of thin layer chromatography and u.v. spectrometry. A basis for this work was the proposal by the European Cosmetic Manufacturers to produce a positive list of u.v. absorbers. It was felt that by carrying out this survey, some priority could be placed on the most popular materials used by the industry. When comparing those found with the European list of u.v. absorbers 1978, only twenty-four of the sixty compounds listed could be identified in the samples. The six most frequently used were found to be:

• 1 2-Ethylhexyl.p.methoxycinnamate (nineteen brands).
• 2 2-Phenylbenzimidazole.5-sulphonic acid (eleven brands).
• 3 2-Ethoxyethyl.p.methoxycinnamate (nine brands).
• 4 3 (4′Methylbenzylidene)D,D,L-camphor (seven brands).
• 5 3-Benzylidene.D,L-camphor (six brands).
• 6 2-Hydroxy.4-methoxy.benzophenone (six brands).

Usage levels varied from 0.4% up to 6.8%. Twenty-two products used a combination of two, and four products a combination of three sun-screens. Les filtres u.v. dans les produits anti-solaires 1978