构建京郊农村居民饮水安全保障体

提出了构建京郊农村居民饮水安全保障体系的供水规划与供水方式选择、水源选择与保护、水处理工艺选择、消毒工艺选择、材料设备选择、工程建后管理与监督、计量收费、用水户参与机制等八大环节，力图为科学构建京郊农村居民饮水安全保障体系提供参考和借鉴。     

构建京郊农村居民饮水安全保障体系的探讨

提出了构建京郊农村居民饮水安全保障体系的供水规划与供水方式选择、水源选择与保护、水处理工艺选择、消毒工艺选择、材料设备选择、工程建后管理与监督、计量收费、用水户参与机制等8大环节,力图为科学构建京郊农村居民饮水安全保障体系提供参考和借鉴.     

车床后托架的工序设计

工序设计包括工序基准的选择、工序尺寸的确定、加工余量的确定、机床的选择、工艺装备的选择、切削用量的选择和时间定额的确定。文章分析并设计了车床后托架,仿真结果分析表明达到设计要求。     

秸秆粉碎还田机的正确使用与维护

一、粉碎还田机的正确选择1、幅宽的选择幅宽的选择,主要根据用户拖拉机的动力大小和作物的品种及长势来选择,为了使拖拉机发挥最大的功能,一般应按下表选择。其次还应根据当地地块的幅宽和种植行距来确定。     

黄果树风景名胜区配网规划研究

对黄果树风景名胜区的配电网现状、电力规划进行详细论述,重点阐述电力规划中涉及的负荷分类、负荷区域规划、电源点设置、电源网架构想、配变选择、计量方式选择、线路通道选择、供电可靠性选择、过电压预防措施、配电室及配电箱柜外观设计等,并根据当前黄果树景区特点对其配网自动化建设进行思考。     

电力客户的多元选择问题探析

市场经济本质上是给予客户更多的选择权,消费者可以选择不同的商品,也可以选择不同的商家。供电公司在客户办电过程中也会提供多种选择,给予客户更多的便利。但由于客户电价电费知识缺乏,很难了解各种选择的优劣。笔者通过对客户办电过程中的多元选择问题进行深入分析,对客户办电过程中遇到较多的基本电费计费方式的选择、峰谷电价的选择及一户多人口电价的选择等问题进行详尽分析,希望能为客户做出最优选择提供参考。     

魔芋病害防治技术

<正>1栽培技术防治1.1地域和土壤选择种植区域:海拔500~1 000 m的区域比较适宜魔芋的种植,海拔700~1 000 m为最适宜区域;要避开多风灾地域,以免风灾造成叶柄折断,植株停止生长,此外还应根据魔芋喜温暖、湿润、荫蔽的生长习性选择地势较高,灌排水方便的地块。土壤选择:选择土层深厚,土壤疏松,有机质含量丰富,保水保肥且不渍水的壤土或砂壤土。1.2种芋选择选用抗病品种:选择膨大性好、抗病性强、葡甘聚糖含量高的优良新品     

买联合收割机十要点

一、购机前,要对使用范围、环境、工作性质作详细调查。如小麦主产区,要选择小麦联合收割机;稻麦主产区,就要选择稻麦两用联合收割机。 二、考虑跨省区服务作业,宜选择大中机型;在县内使用的选择中小机型较经济。 三、选择机型时,要考虑到适合当地的使用要求,选择名牌产品。     

小麦保护性耕作注意事项(二)

<正>二、小麦免耕施肥播种机选择及作业应注意的事项:在小麦免耕施肥播种机规格选择上应注意两个问题。一是作业幅宽选择,应尽可能与当地的种植规格、农艺要求相适应。二是种植行距选择,主要考虑地块产量和秸秆覆盖量。对于高产田两季作物秸秆全部粉碎还田的地块,一般选择33cm左右的行距;中低产田     

农村低压台区线损管理的"三要素"

1人员要素 1.1选择合适的人到合适的岗位上.依据岗位任职标准,选择有管理能力和降损技术知识及经验的人担当线损专责,选择能力强、素质高、责任心强的农电工到供电能量大的台区工作.选择组织能力强、业务素质高的人担任班长.使人尽其才,才尽其能.     

Overland water and salt flows in a set of rice paddies

Cultivation of paddy rice in semiarid areas of the world faces problems related to water scarcity. This paper aims at characterizing water use in a set of paddies located in the central Ebro basin of Spain using experimentation and computer simulation. A commercial field with six interconnected paddies, with a total area of 5.31 ha, was instrumented to measure discharge and water quality at the inflow and at the runoff outlet. The soil was classified as a Typic Calcixerept, and was characterized by a mild salinity (2.5 dS m⁻¹) and an infiltration rate of 5.8 mm day⁻¹. The evolution of flow depth at all paddies was recorded. Data from the 2002 rice-growing season was elaborated using a mass balance approach to estimate the infiltration rate and the evolution of discharge between paddies. Seasonal crop evapotranspiration, estimated with the surface renewal method, was 731 mm (5.1 mm day⁻¹), very similar to that of other summer cereals grown in the area, like corn. The irrigation input was 1874 mm, deep percolation was 830 mm and surface runoff was 372 mm. Irrigation efficiency was estimated as 41%. The quality of surface runoff water was slightly degraded due to evapoconcentration and to the contact with the soil. During the period 2001–2003, the electrical conductivity of surface runoff water was 54% higher than that of irrigation water. However, the runoff water was suitable for irrigation. A mechanistic mass balance model of inter-paddy water flow permitted to conclude that improvements in irrigation efficiency cannot be easily obtained in the experimental conditions. Since deep percolation losses more than double surface runoff losses, a reduction in irrigation discharge would not have much room for efficiency improvement. Simulations also showed that rice irrigation performance was not negatively affected by the fluctuating inflow hydrograph. These hydrographs are typical of turnouts located at the tail end of tertiary irrigation ditches. In fact, these are the sites where rice has been historically cultivated in the study area, since local soils are often saline-sodic and can only grow paddy rice taking advantage of the low salinity of the irrigation water. The low infiltration rate characteristic of these saline-sodic soils (an experimental value of 3.2 mm day⁻¹ was obtained) combined with a reduced irrigation discharge resulted in a simulated irrigation efficiency of 60%. Paddy rice irrigation efficiency can attain reasonable values in the local saline-sodic soils, where the infiltration rate is clearly smaller than the average daily rice evapotranspiration.     

瓦房店市水果生产标准化发展研究

瓦房店市是我国重要的水果生产基地,在国内水果生产领域占有重要地位。随着水果市场化的不断深入,如何满足和适应国内外市场需求成为瓦房店市水果生产的关键问题。从瓦房店市水果生产实际出发,阐述了实施水果生产标准化的必要性,提出了发展水果生产标准化的具体措施。     

金谷子耐旱TG118引种试种及推广应用

对引进的谷子新品种金谷子耐旱TG118进行品种比较试验和多点试种。结果表明：该品种抗旱、耐瘠、适应性强,稳产、高产、抗病抗风抗倒伏强,品质优良,粮草兼用,种植简单,省工易管;一般产量在6000kg/hm2以上,比当地主栽品种增产20%以上。最高产量达9450kg/hm2,适于在辽西北地区推广应用。     

对《种子法》存在问题的探讨

《种子法》是我国种植业第一部法律。自实施以来,为依法加强种子管理提供了有力的法律支撑,促进我国种子产业发生翻天覆地的变化。但随着依法管理工作的深入和种子产业的快速发展,《种子法》及配套规章的一些问题逐步显现出来。对《种子法》及配套规章存在的问题进行深入分析,对需要进一步补充的章节以及需要调整的内容进行深入探讨,以求更加完善和明确。     

Review of the Egyptian experience in implementing land drainage projects

About 30 years have passed since the Government of Egypt embarked on implementing a series of large scale drainage projects. At present, about 3.8 million acres have been provided with drainage systems on the basis of systematic pre-drainage investigations and designs. The target is to provide drains in approximately 6.4 million acres in the Nile Valley and Delta.The implementation of the subsurface drainage system is carried out by the public sector and private contractors under direct supervision of governmental regional departments. The implementation process depends on many factors related to the drainage material, machinery, manpower, site requirements, farmers and organizations involved. Problems and constraints are sometimes challenging, however, the annual rate of implementation has gradually increased to 170,000 acre/year.This paper discusses the different aspects involved in the implementation process of drainage systems. The development in materials, machinery and construction technologies will be reviewed. Institutional and management factors are going to be also considered.     

和谐社会理论建设的几点哲学思考

在新世纪,面对机遇和挑战,党的十六大把“社会更加和谐”作为全面建设更高水平的小康社会的一个重要目标。中国人素有社会和谐的理想;西方人自古也向往社会和谐;借鉴东西方两种和谐社会思想的经验、教训,构建社会主义和谐社会理论。     

A European irrigation map for spatially distributed agricultural modelling

We present a pan-European irrigation map based on regional European statistics, a European land use map and a global irrigation map. The map provides spatial information on the distribution of irrigated areas per crop type which allows determining irrigated areas at the level of spatial modelling units. The map is a requirement for a European scale assessment of the impacts of irrigated agriculture on water resources based on spatially distributed modelling of crop growth and water balance. The irrigation map was compiled in a two step procedure. First, irrigated areas were distributed to potentially irrigated crops at a regional level (European statistical regions NUTS3), combining Farm Structure Survey (FSS) data on irrigated area, crop-specific irrigated area for crops whenever available, and total crop area. Second, crop-specific irrigated area was distributed within each statistical region based on the crop distribution given in our land use map. A global map of irrigated areas with a 5′ resolution was used to further constrain the distribution within each NUTS3 based on the density of irrigated areas. The constrained distribution of irrigated areas as taken from statistics to a high resolution dataset enables us to estimate irrigated areas for various spatial entities, including administrative, natural and artificial units, providing a reasonable input scenario for large-scale distributed modelling applications. The dataset bridges a gap between global datasets and detailed regional data on the distribution of irrigated areas and provides information for various assessments and modelling applications.     

粉质仪和拉伸仪在面粉生产中的应用

在介绍粉质仪和拉伸仪结构和原理的基础上,探讨了粉质曲线中吸水率、形成时间、稳定时间、弱化度和评价值等指标与面粉品质的关系,以及如何根据拉伸曲线中面团最大拉伸阻力、延伸度和拉伸曲线面积等指标来评价面团品质,并结合生产实际,概述了粉质仪和拉伸仪在面粉生产中的作用。     

农村信息化服务的现状及建设措施

分析当前我国农村信息化服务的现状,提出加强农村信息化服务的新举措。     

车辆ABS控制算法的研究及探讨

对现代汽车的ABS控制算法作了一些简单的介绍,同时指出了它们的一些缺陷,相应地提出了几种对ABS的其它控制方法并加以探讨,其中着重论述了ABS门限值控制算法中参考车速的确定方法和基于附着系数的控制算法。