共查询到19条相似文献,搜索用时 171 毫秒
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针对石漠化综合治理信息管理滞后、成果共享困难等,基于Arc GIS Engine、Microsoft Visual Studio和Dreamweaver开发环境,采用C/S与B/S混合结构体系构建石漠化管理信息系统,介绍了系统体系结构、系统功能、数据组织等。C/S桌面应用系统以Com GIS技术进行组建,实现数据的查询、分析与统计等。基于Internet的Web GIS应用系统通过Arc GIS Server技术实现石漠化综合治理数据及成果信息的共享与发布,为石漠化的综合治理提供技术支撑。 相似文献
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分析了传统税务信息系统的弊端,研究了关于开发本系统的J2EE、XML、XSL和MVC等技术,采用分布式多层体系结构的解决方案,在中软业务基础平台之上搭建广东国税信息门户应用系统。从研究、讨论、设计和实现几方面论述了本系统采用的多层体系结构所具有的较强的通用性、较好的可复用性和较灵活的可扩展性以及较高的信息集成性。 相似文献
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电子交易市场实时拍卖系统是一种基于Internet的第三方大宗商品电子交易平台。它以电子拍卖形式进行交易,涵盖了货款支付、货物交收及市场管理业务。系统采用了C/S与B/S相结合的混合体系架构,兼顾了系统的实时性与协同商务流程的灵活性。本文介绍了该实时拍卖模式,对其运营系统的运行时TOP架构、实时数据处理、实时通讯及系统安全进行了分析与设计。 相似文献
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随着互联网应用的不断发展,Web应用系统和即时通讯软件有了更深层次结合的需求。在本文描述的“浙江科技信箱”项目中,需要将基于B/S架构的Web邮件和基于C/S架构IM系统进行整合,以实现数据和功能的无缝集成。本文提出一种基于XMPP协议和web Services技术的集成方法。该方法对XMPP协议进行扩展,设计出新的子协议,实现了诸如Web邮件的通讯录与IM好友列表自动同步等功能,极大地增强了用户操作的简便性。 相似文献
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“农业生产技术远程咨询服务系统”是直接服务于农业生产的信息系统。系统主要由系统管理、经验交流和咨询服务三大功能模块组成,采用B/S体系结构,利用ASP、CSS、Html等脚本语言和SQL Server数据库技术进行开发。 相似文献
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高校实验室管理信息系统能够减轻实验室管理人员的负担,提高管理效率和服务水平。本文主要介绍当前高校实验室管理信息系统的三种开发模式(C/S模式,B/S模式,混合模式),详细分析了它们的优缺点,并列举了应用实例. 相似文献
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国家级作物长势遥感监测业务系统设计与实现 总被引:6,自引:2,他引:4
作物长势监测是农情遥感监测的重要组成部分。为了建立稳定的作物长势监测业务系统,该文一方面选取NDVI时间序列提取的时空参数从不同侧面描述作物长势,建立作物长势监测的综合性模型,另一方面建立了一个覆盖全国主要农区、由200个县组成的地面调查网络,采集地面实况信息,并采用客户端/服务器(C/S)和浏览器/服务器(B/S)的混合结构开展系统设计,基于遥感和地面调查两个角度设计实现了国家级作物长势遥感监测业务系统,同时对由于作物种类和监测区域不同引起的长势评价标准不一致、模型定量化和业务系统架构仍需根据应用进一步分解完善等问题进行了讨论。以中国冬小麦主产区为例,进行了作物长势监测试验,取得较好的监测结果。目前该系统已在大尺度作物遥感监测中得到应用。 相似文献
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This study evaluated the physicochemical changes in the soil of potato field that was irrigated by fresh water, differentially diluted wastewater and undiluted wastewater (hereafter called wastewater). The potato crop was cultivated for consecutive three seasons under fertilized and unfertilized conditions. The wastewater contained higher concentrations of organic carbon (C), nitrogen (N), phosphorus (P), potassium (K), sodium (Na), calcium (Ca), magnesium (Mg), sulfur (S), zinc (Zn) and boron (B) and lower concentrations of heavy metals. In this study, properties of wastewater-irrigated soil were compared with fresh water-irrigated soil. The application of wastewater reduced the bulk density of the surface soil by 2.83% and augmented the porosity by 6.02%. The unsaturated hydraulic conductivity and water retention capacity of the soil were improved under wastewater irrigation. Soil pH increased due to wastewater application but decreased, to a smaller extent, due to fertilizer application. Soil EC increased both with wastewater and fertilizer application; both parameters changed significantly in the top 0–15 cm soil layer. But, at the deeper layers, they were not affected by wastewater application. The organic C, total N, available P and S of the soils increased significantly (p = 0.05) when potato field was irrigated with raw wastewater. The organic C increased by 23.80% under wastewater irrigation in the top soil layer. The N content of the soil showed similarities with the organic C contents. Exchangeable Na, K, Ca, Mg; Zn and B of the soil also increased significantly with wastewater application. So, irrigation with urban wastewater is suggested to improve soil fertility as well as to ease pressure on the fresh water in the area of water scarcity. 相似文献
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长期不同量秸秆炭化还田下水稻土孔隙结构特征 总被引:1,自引:0,他引:1
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减施化肥与不同有机肥配施对稻季土壤细菌群落结构的影响 总被引:1,自引:0,他引:1
为了研究减施化肥配施不同有机肥对稻麦轮作体系稻季土壤细菌群落结构的影响,采用Illumina高通量测序技术比较了单施化肥、配施菜籽饼和配施蚯蚓粪这3种施肥模式下稻季不同土层土壤环境因子、细菌群落结构变化特征。与单施化肥相比,配施有机肥显著提高各土层土壤有机质和电导率(EC)含量,配施菜籽饼增幅较大;显著增加各土层土壤氮磷钾养分含量,配施蚯蚓粪的土壤速效氮磷钾养分含量较高。配施有机肥提高土壤细菌Sobs指数和Shannon指数;前三位优势菌门,变形菌门(Proteobacteria)、酸杆菌门(Acidobacteria)、绿弯菌门(Chloroflexi)相对丰度分别达36.24%、18.30%、13.87%;配施有机肥对相对丰度小于1%的菌门影响较大。0-5cm土层土壤细菌群落结构主要受pH、TP影响;5-10cm土层土壤细菌群落结构主要受EC,TP、pH影响;10-15cm土层土壤细菌群落结构主要受TN、pH影响。配施有机肥通过改变土壤理化性质进而影响土壤细菌群落结构,特别是稀有菌群。 相似文献
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S. K. Biswas M. A. Mojid G. C. L. Wyseure 《Communications in Soil Science and Plant Analysis》2017,48(1):1-10
Irrigation with wastewater provides the opportunity to solve the problems of its disposal, reuse and water conservation. Freshwater, differentially diluted wastewater and undiluted wastewater (hereafter called wastewater) were used to grow wheat in sandy loam soil under fertilized and unfertilized conditions at the experimental farm of Bangladesh Agricultural University, Bangladesh. Fresh groundwater and wastewater of Mymensingh municipality were used to irrigate a wheat field for three consecutive years to examine the effects of wastewater application on soil properties. In this study, the properties of wastewater-irrigated soil were compared with freshwater-irrigated soil. The application of wastewater reduced the bulk density of the surface soil by 1.92% and augmented the porosity by 5.89%. The unsaturated hydraulic conductivity and water retention capacity of the soil were improved under wastewater irrigation. Soil pH increased due to wastewater application but decreased, to a smaller extent, due to fertilizer application. Soil electrical conductivity (EC) increased both with wastewater and with fertilizer application; both parameters changed significantly in the 0–20 cm soil layer. However, at the deeper layers, they were not affected by wastewater application. The organic carbon (C) and total nitrogen (N) level of the soils were higher under wastewater irrigation than under freshwater-irrigated soil. The organic C increased by 23.93% under wastewater irrigation in the top 20 cm soil layer. The N content of the soil showed similarities with the organic C contents. Available P and S concentrations were greater in the soil irrigated with wastewater compared with the soil irrigated with freshwater. The exchangeable cations – sodium (Na), potassium (K), calcium (Ca) and magnesium (Mg) – also increased significantly with wastewater application. Thus, farmers are advised for irrigation with municipal wastewater to ease pressure on freshwater and to improve soil fertility. 相似文献
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多层生物滤塔去除废气中硫化氢 总被引:3,自引:1,他引:2
为了解决填料及单层滤塔中压降大、效率低的问题,以单层玉米芯生物滤塔为对照,研究了多层生物滤塔对低浓度H2S气体的净化效果,其适宜的工艺条件和生物降解宏观动力学。结果表明:填料分层填充可提高废气中H2S去除率,当进气浓度低于140 mg/m3时,H2S的去除率90%以上;H2S进气容积负荷、去除率与填料层填充厚度有一定的相关性,负荷低于42.2 g/(m3·d),下层200 mm填料对H2S总去除率的贡献在95%以上;填料含水率为55%~70%,生物滤塔的微生物活性较高,净化效率高;试验条件下,采用Michaelis-Menten模型进行生物降解宏观动力学研究,其中半饱和常数为12.4 mg/m3,污染物最大去除速率为909 g/(m3·d)。试验表明:多层生物滤塔净化效果优于单层,其气流分布更均匀,停留时间延长,压降低,效率高;在适宜的工艺条件下运行3个月,对H2S净化效率均稳定在90%以上,为进一步研究及工程应用提供理论指导。 相似文献
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不同粒径生物炭包膜尿素缓释肥性能及缓释效果 总被引:1,自引:0,他引:1
为探究生物炭粉包膜处理对尿素缓释效果的影响,该研究以不同粒径稻壳生物炭粉为包膜材料,对尿素颗粒进行不同层数包膜处理,分别制备了3种生物炭包膜尿素缓释肥C_1(0.15 mm生物炭粉包膜)、C_2(内层0.15 mm,外层0.25 mm生物炭粉包膜)和C_3(内层0.15 mm,中层0.25 mm,外层0.425 mm生物炭粉包膜),并对生物炭包膜尿素缓释肥性能及缓释效果进行了分析研究。研究结果表明3种生物炭包膜缓释肥粒径主要分布在2.90~4.80 mm,随着包膜层数的增加,包膜缓释肥粒径随之增大,C_2和C_3粒径显著高于C_1(P0.05)。C_1、C_2和C_3的抗压强度为20.40~48.00 N,满足工业生产需求。与C_1和C_2相比,C_3颗粒表面较光滑,切面具有致密且孔隙结构丰富的层状结构,吸水倍率最小(1.69),耐水性也显著优于C_1与C_2(P0.05),氮元素缓释效果优于C_1与C_2。综上可以看出,3层包膜尿素缓释肥膜壳强度高于单层和双层包膜尿素缓释肥,通过控制不同膜层生物炭的孔隙结构和孔径,减缓水分的渗入及养分的流出过程,缓释效果突出,为生物炭包膜缓释肥的开发应用提供一个新技术路径。 相似文献