Modeling water and carbon fluxes above summer maize field in North China Plain with back-propagation neural networks

INTRODUCTION Dynamics of carbon and water vapor fluxesexchange between the atmosphere and the ecosystembiosphere, depend on complex and non-liner interplayamong physiological, ecological, biochemical andedaphic factors and meteorological conditions (Jarvis,1995; Leuning et al., 1995). There are many studiesquantifying the fluxes across different time and spacescales as well as assessing the environment con-straints on them by some kinds of biophysical orempirical models whose resul…     

浅析网络教育与传统教育优势互补关系

网络教育和传统教育应当是一个有益的互补的关系，认识到这一点有利于我们坚定网络教育发展的信心，同时又有利于网络教育的发展。我们应从与传统教育互补的角度来精心策划和整合，以保证网络教学的质量和优势，避免目前网络教育发展中的盲目炒作和建设；同时正确对待网络教育的冲击，注意信息技术在教育中的应用。     

A framework of region-based dynamic image fusion

INTRODUCTION Image fusion is a sub-area of more general topics of Information Fusion and Data Fusion and deals with static images and dynamic images (image sequences or video data) (Maitre and Bloch, 1997). By com-bining the information from a range of image data obtained by different sensors or the same sensor with different imaging schemes, the composite image al-ways presents the complementary information of different input images at the same time and provides us the integrated descr…     

Effects of pH and Eh on release of nitrogen and phosphorus from sediments of West Lake

INTRODUCTIONAsasinkandaninnersourceofnutrients,sedimentsplayanimportantroleinlakeeutroph ication.TheeutrophicationstatusofWestLakeisstillcriticalinrecentyearsevenaftermostpollutionsourcesaroundWestLakehavebeencontrolled(Peietal.,1998) ,mainlythroughtherel…     

背景知识与英语学习

英语是一门异族语言成功地掌握一门异族语是广大外语学习者梦寐以求的目标。文章以大量的事例,从多个角度论证了背景知识在英语学习过程中的重要作用,旨在使外语学习者充分认识到背景知识的重要性,从而在学习的过程中注重背景知识的积累,真正实现自己的目标,学有所成。     

化蛹为蝶的人生体验——论池莉的生活观与爱情观

自上世纪八十年代以来,池莉的小说以其独特的观察人生的视角、流利酣畅而又不乏幽默的语言,为中国当代小说创作营造了一片崭新的天空。在“武汉”这片天空之下,池莉执着地表现着生活,表现着饮食男女的喜怒哀乐,也表现着自己对于人生、人性的探求。     

汇率干预中的多点自由边值问题的数值计算方法

1IntroductionIt is i mportant for the economic development of acountry to maintain the stabilization of exchange rate,so the intervention of exchange rate has become thetopic of the main concerns of the economic and math-ematical circles[1-5].To maintain the stabilization ofexchange rate,many countries use target zone re-gi mes,that is,the central banks intervene in the for-eign exchange market such that the exchange ratestays within the interval[a,b].There are fixed costand cost proportional …     

谭人凤与长江革命

长江革命是中国近代时局和革命发展的产物.谭人凤一生致力于长江流域的革命斗争.尤其在1911年,谭人凤与宋教仁等筹划建立的中部同盟会,为武昌首义的胜利作出了杰出的贡献,推动了整个资产阶级民主革命的进程.     

双壁钢围堰吸泥下沉、清基及水下封底过程中有关问题的处理办法

系统概述了介绍芜湖长江大桥11号主墩双壁钢围堰吸泥下沉、清基及水下封底过程和应注意的事项及有关问题的解决办法。     

天目山植物分类、查询和鉴别专家系统的构建

本文针对植物学野外实习中存在植物鉴别难的问题,试构建专家系统来提高鉴别植物的效率。