激发学习兴趣,鼓励学生参赛

第五届全国周培源大学生力学竞赛已经结束，本次竞赛共有164所高校参赛，为竞赛的成功付出了不懈的努力．在此，我们特邀请获得本次竞赛团体第一名的北京航空航天大学就其组织和开展学科竞赛的情况作一介绍，希望能够提供大家以借鉴．同时希望今后的力学竞赛能够取得更好的成绩，为力学课程建设和教学改革起到良好的促进作用．     

关于全流域地质环境多层次、全方位的研究——以长江流域为例

中国是一个水资源相对匮乏的国家, 人均水资源占有量仅为世界人均占有量的 1/ 4, 随着国民经济的发展和人民生活水平的提高, 水资源匮乏的现象将更突出, 并将成为制约我国国民经济发展重要因素。据预测, 至 2 0 30年, 我国的人均水资源量将由现在的2 2 2 0m³降到 176 0m³,接近国际一般承认的用水紧张的国家标准 (人均水资源量少于 170 0m³)。我国水资源的一个重要特点是分布的不均衡和水、土资源区域分布的不协调。     

Prof. Forssberg from Sweden Visits Labs of Particle Technology in China

Professor Eric Forssberg of Lulea University of Technology in Sweden visited the key laboratory of Powder Technology of the Beijing University of Aeronautics and Astronautics （BUAA）, Beijing General Research Institute of Mining and Metallurgy （BGRIMM） and the particle/powder technology group of South China University of Technology （SCUT）, after attending the 8^th General Assembly of the Chinese Academy of Engineering, June 7-9, 2006. Prof. Forssberg who chairs the European Committee of Comminution and Classification is an expert in the preparation of inorganic powder materials, separation of fine particles, characterization/processing of solid waste and modelling of material processing.     

Chinese Society of PARTICUOLOGY

PURPOSE The Chinese Society of Particuology is a voluntary organization of workers in research, development and application of the science and technology of particles. The Society is dedicated to fostering liaison and exchange among its members through scientific and technical symposia and seminars of both a national and international nature and to disseminating knowledge on particles through continuing education and publication in the form of scientific transactions and of journals on news and other items of current interest. Its ultimate objective is to serve the country＇s needs for modemization.     

在第五届全国周培源大学生力学竞赛颁奖式上的讲话

今天能有机会参加“第五届全国周培源大学生力学竞赛颁奖式”，并与大家见面，感到非常荣幸．首先，请允许我代表周培源基金会，向在这次竞赛当中获奖的同学表示热烈的祝贺!向在这次活动中付出辛勤劳动的老师、工作人员以及支持单位和各位领导表示衷心的感谢!     

力学学科“九五”期间重点项目情况介绍

力学学科“九五”期间重点项目情况介绍孟庆国靳征谟国家自然科学基金委员会数理科学部，北京１０００８３国家自然科学基金委员会受理和资助面上、重点和重大三个层次的基金项目．面上项目以一年为一个单元，依据所提交的申请书，经过专家同行评议，最后由学科评审组会议...     

中国沿海地质环境与区域持续发展的若干问题探讨

本文分析了中国沿海岩石圈动力学的基础特征, 指出中国东部沿海地质环境与灾害存在南北分异的格局, 阐述了沿海区域工程地质环境的基本规律, 并通过全球及中国近百年海平面变化, 以及人类工程活动对河口海岸地质环境影响的分析, 对沿海地区未来的地质环境与灾害趋向做了初步评估, 并认为中国沿海21世纪的环境与发展将面临严峻的挑战, 特别是环渤海地区。最后, 对影响沿海区域发展的若干问题进行了初步探讨并提出了几点建议。     

SPATIAL AND SEASONAL DISTRIBUTIONS OF ATMOSPHERIC CARBONACEOUS AEROSOLS IN PEARL RIVER DELTA REGION, CHINA

Concentrations and spatial distributions of organic carbon (OC) and elemental carbon (EC) in atmospheric particles were measured at 8 sites in four cities (Hong Kong, Guangzhou, Shenzhen and Zhuhai) of Pearl River Delta Region (PRDR), China during 2001 winter period and 2002 summer period. PM2.5 (particie diameter smaller than 2.5 um) and PM10 (particie diameter smaller than 10 um) samples were collected on pre-fired quartz filters with mini-volume samplers and analyzed using thermal optical reflectance (TOR) method. The average PM2.5and PM10 Ievel were 60.1 and 93.1 μg·m-3, respectively, with PM2.5 constituting 65.3% of the PM10 mass. The average OC and EC concentrations in PM2.5 were 12.0 and 5.1 μg·m-3, respectively, while those in PM10 were 16.0 and 6.5 μg·m-3, respectively. The carbo-naceous aerosol accounted for 37.2% of the PM2.5 and 32.8% of the PM10. The highest concentrations of OC and EC were observed at Guangzhou city in both vvinter and summer seasons. The average OC/EC ratios were 2.