J2EE 设计模式的研究与应用

讨论了DAO、工厂方法、抽象工厂和值对象等几个J2EE模式的用途及特点,然后介绍了学生及课程信息管理系统的设计与实现,并根据系统设计框架和类图说明了这些模式在具体实现过程中的作用,最后总结了该设计优越性及不足之处.     

Evalution on nutritive value ofPortunus trituberculatus

This study on the nutritive indexes (total nitrogen, amino acids, crude fats, inorganic elements, unsaturated fatty acids) of meat, male and female reproductive gland ofPortunus trituberculatus showed that their nutritive value is in the order meat>female reproductive gland>male reproductive gland and that they do not raise the total cholesterol (TC) and triglyceride (TG) contents of the serum of the animals which eat them but increase the contents of high density lipoprotein cholesterol (HDL-C) in the animal's blood. These findings implied that people who have high blood lipid and aortic atheroma can safely use them as food. This study showed thatP. trituberculatus has high nutritive value.     

BOOK REVIEWS

Book Reviewed in this article: The Vanishing Farmland Crisis, Critical Views of the Movement to Preserve Agricultural Land . John Baden Protecting Farmlands . Frederick R. Steiner and John E. Theilacker Ecological Effects of Fire in South African Ecosystems . Peter de V. Booysen and Neil M. Tainton Geography in China . Wu Chuanjun , Wang Nailiang , Lin Chao and Zhao Songqiao Resource Inventory and Baseline Study Methods for Developing Countries . Francis Conant , Peter Rogers , Marion Baumgardner , Cyrus Mc Kell , Raymond Dasmann, and Priscilla Reining Principles of Remote Sensing . Paul J. Curran Famine As A Geographical Phenomenon . Bruce Currey and Graeme Hugo The Suburban Squeeze: Land Conversion and Regulation in the San Francisco Bay Area . David E. Dowall Senses of Place . John Eyles Uneven Development and the Geographical Transfer of Value . D. K. Forbes and P. J. Rimmer Issues in Wilderness Management . Michael Frome Land-use and Prehistory in South-east Spain , The London Research Series in Geography 8. Antonio Gilman and John B. Thornes with Stephen Wise Regions in Question, Space, Development Theory and Regional Policy . Charles Gore The Colorado River: Instability and Basin Management . William L. Graf Hazardous Waste Sites: The Credibility Gap . Michael R. Greenberg and Richard F. Anderson Peasants, Subsistence Ecology, and Development in the Highlands of Papua New Guinea . Lawrence S. Grossman Silver Cities: The Photography of American Urbanization, 1839-1915 Peter B. Hales Silicon Landscapes . Peter Hall and Ann Markusen Remaking Ibieca: Rural Life in Aragon under Franco . Susan F. Harding The European Energy Challenge: East and West . George W. Hoffman The Global Climate . John T. Houghton The Urban Jobless in Eastern Africa . Abel G. M. Ishumi . The Tourist: Travel in Twentieth-Century North America . John A. Jakle City and Society: An Outline for Urban Geography . R. J. Johnston Residential Segregation, The State and Constitutional Conflict in American Urban Areas . R. J. Johnston Accessibility and Utilization: Geographical Perspectives on Health Care Delivery . Alun E. Joseph and David R. Phillips To the Heart of Asia: The Life of Sven Hedin . George Kish North American Culture , Vol 1. Ary J. Lamme III Past and Present in the Americas: A Compendium of Recent Studies . John Lynch Ethnicity in Contemporary America: A Geographical Appraisal . Jesse O. Mc Kee The Shell Countryside Book . Richard Muir and Eric Duffey 1990 Planning Conference Series. Proceedings of the National Geographic Areas Conference . Proceedings of the Regional Geographic Areas Conferences Wood, Brick, and Stone: The North American Settlement Landscape . Vol. 2: Barns and Farm Structures . Allen G. Noble Bangladesh: Biography of a Muslim Nation . Charles Peter O'donnell     

鲁西北覆盖区生态地球化学调查方法与技术探讨

为促进鲁西北地区经济发展,查清该区生态地球化学环境,迫切需要开展生态地球化学调查。鲁西北覆盖区生态地球化学调查,以区域地球化学方法为主体,结合土壤地质、第四纪地质、水文地质、灾害地质、地球物理、遥感地质、计算机技术等多学科研究方法,对该区的区域农业、城市、主要名特优产区、主要地方病流行区等地域的生态地球化学环境进行评价;建立鲁西北覆盖区多层次生态地球化学信息系统,为山东经济可持续发展提供区域生态地球化学方面的依据。     

含钾岩石的综合开发利用及其潜在经济价值

含钾岩石泛指含氧化钾、氧化铝较高的一类铝硅酸盐岩石,它潜在着相当大的经济价值,对其进行综合开发利用。可生产出钾肥、金属铝、纯碱以及水泥等产品,既能缓解工农业对钾肥和金属铝的迫切需要,又能创造良好的经济效益,使矿产资源能得到充分合理的利用。     

广西观赏石开发利用前景

石文化作为一种文化现象是华夏文化的重要内容，观赏石具有较高的收藏价值及商品经济价值。广西观赏石资源丰富，品种繁多，有较好的利用前景。根据观赏石的形态特征、产出地质条件划分为造形石类、纹理石类、矿物晶体类、古生物化石类、特殊石类等，各类观赏石其形成地质环境各异，在大自然的雕塑下展现出的欣赏价值各放异彩。在商品经济中具有较大的潜力及较高收藏欣赏价值。     

Factors affecting soil respiration in reference with temperature’s role in the global scale

Soil respiration is CO₂ evolution process from soil to atmosphere, mainly produced by soil micro-organism and plant roots. It is affected not only by biological factors (vegetation, micro-organism, etc.) and environmental factors (temperature, moisture, pH, etc.), but also more and more strongly by man-made factors. Based on literature survey, main factors affecting soil respiration were reviewed. The relationship of soil respiration to latitude and to mean annual temperature were analyzed by using the data measured from forest vegetation in the world. As a result, soil respiration rate decreased exponentially with an increase of latitude, and increased with increasing temperature. Following the relationship between soil respiration and temperature, Q₁₀ value (law of Van Hoff) was obtained as 1.57 in the global scale. This project was supported by National Natural Science Foundation of China to FJY (No. 3940003).     

山东省小清河中下游地区土壤地球化学特征

经调查证实 ,小清河中下游地区土壤质量较好 ,N ,P ,K ,Cu ,Zn ,Fe等元素在土壤中含量丰富 ,但B元素含量不足 ,Mo元素含量严重短缺 ,且有不同程度的污染 ,应引起足够重视。     

The Reissner–Sagoci problem for a transversely isotropic half‐space

A transversely isotropic linear elastic half‐space, z?0, with the isotropy axis parallel to the z‐axis is considered. The purpose of the paper is to determine displacements and stresses fields in the interior of the half‐space when a rigid circular disk of radius a completely bonded to the surface of the half‐space is rotated through a constant angle θ₀. The region of the surface lying out with the circle r?a, is free from stresses. This problem is a type of Reissner–Sagoci mixed boundary value problems. Using cylindrical co‐ordinate system and applying Hankel integral transform in the radial direction, the problem may be changed to a system of dual integral equations. The solution of the dual integral equations is obtained by an approach analogous to Sneddon's (J. Appl. Phys. 1947; 18 :130–132), so that the circumferential displacement and stress fields inside the medium are obtained analytically. The same problem has already been approached by Hanson and Puja (J. Appl. Mech. 1997; 64 :692–694) by the use of integrating the point force potential functions. It is analytically proved that the present solution, although of a quite different form, is equivalent to that given by Hanson and Puja. To illustrate the solution, a few plots are provided. The displacements and the stresses in a soil deposit due to a rotationally symmetric force or boundary displacement may be obtained using the results of this paper. Copyright © 2006 John Wiley & Sons, Ltd.