“三农”信息资源整合与服务平台的设计与实现

三农信息资源整合与服务共享是现代农业发展的趋势.基于J2EE(Java2 Platform EnterpriseEdition)和XML(eXtensibleMarkedLanguage)标准技术体系架构的农业信息资源整合与服务平台的研究与应用,为解决中国农业信息化建设工作中存在的信息孤岛问题,加快三农信息入户工程的进展,推动社会主义新农村的建设都具有重要意义.     

基于Web Service的农业信息服务系统的研究

针对我国农业信息化进程中存在的问题,阐述了Web service的体系结构及其主要技术,构建了基于webser-vice的农业信息服务系统的框架。采用基于J2EE的web service架构实现了该系统部分功能,从而验证了所设计的农业信息服务系统框架的合理性。     

基于 ArcGIS Server 9.0和 J2EE 构建多层结构的森林资源 WebGIS

阐述了基于ArcGIS Server 9.0和J2EE技术的多层结构森林资源WebGIS的开发思想和各功能层的实现技术,在开发过程中以"瘦客户"模式作为本系统的结构模式,并采用MVC设计模式对系统功能进行分割。同时,以大兴安岭塔河林业局森林资源数据为例,介绍了森林资源空间数据的发布、森林资源WebGIS系统的组成以及其界面的定制、主要功能等。结果表明:ArcGIS Server 9.0、J2EE技术与MVC设计模式的综合使用,使整个森林资源WebGIS系统的开发效率、数据安全性、跨平台可用性、系统功能可扩充性和使用灵活性等方面较传统的双层体系结构系统得到了较大的优化和提升。     

基于SpringMVC+iBATIS框架的生物信息数据库的设计与实现

集成Spring与iBATIS框架技术构建基于J2EE的WEB应用可以提高J2EE项目的可重用性.以轻量级J2EE架构为基础,提出基于SpringMVC+iBATIS框架的一种WEB应用,并以生物信息数据库平台设计为例.实践证明,该系统具有良好的可管理性,可扩展性和可维护性,并能有效地解决大并发和大流量问题.     

Ajax技术在农业装备信息网中的应用

针对中国农业装备信息网利用Web2．0技术优化用户使用界面,提高系统访问效率的要求,采用Ajax技术对基于MVC框架模式的系统进行优化,提出基于现有系统下的Ajax应用模型,使客户端用户操作与服务器间的请求／响应异步化。以信息查询系统为例,介绍了结合运用Ajax技术与J2EE技术,利用客户端闲置资源减轻服务器端负担,有效提高了Web应用程序的执行效率,带来丰富的呈现形式和更为流畅的用户体验。     

教学资源管理系统的研究与设计

目前,以计算机网络技术和教育信息化发展为代表的教学资源的管理逐渐成为教育教学的重心。教师和学生对教学资源的需求日益迫切,教师高质量的备课和再学习等都离不开丰富的教学资源;学生拓展综合能力,提高信息素养,提高研究和解决问题的能力同样也离不开强大的资源平台。这样,就亟需建立一个教学资源管理平台,将教学资源进行信息化、科学化的分类,构成有组织的教学资源库,为使用者提供丰富的内容和优秀教学资源。     

Arbuscular Mycorrhizal Fungi and Glomalin‐Related Soil Protein as Potential Indicators of Soil Quality in a Recuperation Gradient of the Atlantic Forest in Brazil

This study aimed at surveying arbuscular mycorrhizal fungi (AMF) species and glomalin‐related soil protein (GRSP) to understand their role as presumable biological indicators of soil quality in an undisturbed forest site (NT) and three sites with different management histories, soil textures, and different ages of recovery after reforestation for 20 (R20), 10 (R10) and 5 years (R05). Our objective was to determine how physical, chemical and microbiological soil attributes influence AMF species distribution, total‐GRSP (T‐GRSP) and easily extractable‐GRSP (EE‐GRSP). Glomus and Acaulospora were related to impacted sites, Gigaspora rosea to sites R10 and R20 that have different management histories and soil textures and Glomus geosporum to sites NT and R10, suggesting some influence of texture on its distribution. Scutellospora pellucida and other species were found only in one season. Correlations between EE‐GRSP and T‐GRSP on the one hand and total carbon and nitrogen, dehydrogenase and urease activity, microbial biomass carbon and microbial biomass nitrogen, on the other, reached values of 40–70% and were especially strong in summer. Soil bulk density had a negative and macroporosity a positive effect only on EE‐GRSP, suggesting the necessity to choose either EE‐GRSP or T‐GRSP as biological indicator depending on the soil characteristics and management. This study demonstrates the effect of recovery age, seasonality and other soil attributes on AMF and GRSP distribution and shows that these biological attributes may be used as indicators of soil quality in the Atlantic forest in Brazil. Copyright © 2013 John Wiley & Sons, Ltd.     

数字化校园网络在线考试系统的设计与实现

网络技术的飞速发展促进了教育技术的发展,诞生了网络教育,网络教育除了学习其中的内容之外,对学习效果的评价也是必不可少的方面。考试作为测评的最主要的手段,其规范性、科学性以及考试工作的组织、管理等,直接关系到教学测评的准确性和客观性,从而也影响到教学质量的好坏。     

Effect of level and source of nutrients in late gestation on subsequent milk yield and composition and fertility of dairy cows

The effect of level and source of nutrients in late gestation on food intake, milk yield, milk composition and fertility in the subsequent lactation were evaluated in a randomized block design experiment involving 76 cows. Four experimental diets, based on grass silage, were offered to provide two levels of metabolizable energy (ME) intake (80 and 125 MJ/cow/day) either from 100:0 or 40:60 forage:concentrate (F:C) ratios for the last 28 days of gestation. Post-calving all cows were offered the same grass silage supplemented with 7 kg/day concentrates. For treatments 80 ME, 125 ME and 100:0 F:C, 40:60 F:C total dry matter (DM) intakes were 6.8, 10.5, 9.0 and 8.4 kg DM/day and ME intakes were 80, 126, 102 and 104 MJ/day, respectively, during the last 4 weeks of gestation. For weeks 1-16 of the subsequent lactation, treatment 125 ME increased milk fat content and yield but had no effect on food intake, milk protein content or onset of cyclicity. Treatment 125 ME increased condition score and live weight at calving. Altering the F:C ratio of the diets in late gestation had no effect on food intake, milk yield, milk composition or on the onset of cyclicity in the subsequent lactation. Cow parity and level of nutrient intake in late gestation provided the best fit relationships for the yields of fat and fat plus protein (R² relationships=0.49 and 0.52, respectively) during weeks 1-16 of lactation. It is concluded that increasing nutrient intake in late gestation increased milk fat content and yield but had no effect on milk protein concentration. The improved milk fat content and yield observed in a previous study was due to increased nutrient intake rather than altering the F:C ratio. Furthermore there was no measurable benefit in food intake or animal performance in the subsequent lactation through feeding concentrates in late gestation.     

基于WebGIS的重金属污染决策支持系统设计与应用

为解决北京周边地区重金属污染造成的食品安全问题,采用J2EE技术和WebGIS技术,在北京生态环境信息管理平台支持下,构建了重金属污染决策支持系统。并在此基础之上,利用GPS掌上电脑进行采样点定位,在野外53个观测点采集530个土壤样品,进行了样点均匀分布设计、检验和观测值正态分布检验。结果表明,采用地统计学空间插值并进行GIS空间分析,对重金属的空间变异分析能够达到较高精度。决策支持系统集成资源环境数据和基础地理数据,已应用于试验区重金属污染分析,并在WebGIS中实现重金属空间变异的可视化表达。