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农用电泵产品是一种以潜水电机为动力，电机与水泵组装成一体潜入水下运转的提水机械，主要有小型潜水电泵、污水潜水电泵、井用潜水电泵和潜水螺杆电泵等几种类型。农用潜水泵小巧轻便，价格低廉、容易操作，在农村生产生活中起着重要作用。 相似文献
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一、概述小型潜水电泵在我国于60年代初问世，刚开始品种少，产量低，发展缓慢。近几年来，小型潜水电泵才得到了迅速的发展。现在全国小型潜水电泵的年产量已超过200万台，已有近200家企业领到了小型潜水电泵生产许可证。产品广泛用于各行各业的各个领域。为满足小型潜水电泵行业的发展要求，我国于1988年发布了小型潜水电泵的国家标准。它对于指导小型潜水电泵的发展，提高小型潜水电泵产品性能和水平起到了积极的作用。该标准使用以来，各企业基本上按照标准的规定发展产品，取得了较好的效果。但限于当时的条件，标准涉及的范围还不够广… 相似文献
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小型潜水电泵在喷泉水景的应用越来越多，而喷泉水景对泵的使用要求也越来越高。小型潜水电泵因其安装方便、安装成本低的优点被广泛应用于喷泉用泵。但在实践中，普通小型潜水电泵作为喷泉用泵都出现了一些问题。文章通过分析喷泉用小型潜水电泵使用特点及要求，结合小型潜水电泵应用在喷泉上的常见故障，提出喷泉用小型潜水电泵设计要点。 相似文献
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运用生存分析的理论，结合潜水电泵的实际情况，导出了潜水电泵的参数模型和功速失效模型，为正确评价潜水电泵的可靠性指标提供了有效的途径，可供工程技术人员参考，最后给出了应用实例。 相似文献
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于丽萍 《农业机械化与电气化》1998,(3)
潜水电泵的选购及常见故障于丽萍辽中县南门街６号（１１０２００１潜水电泵的选购潜水电泵一般有湿式和干式两种类型。用户在选购时，首先应考虑当地的水质条件。若水质泥沙含量较大，则应选用湿式潜水电泵，反之，则应选用干式潜水电泵。具体泵型的选择，应考虑以下两... 相似文献
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潜水电泵的选购及常见故障一、潜水电泵的选购潜水电泵一般有湿式和干式两种类型。用户在选购时．首先应考虑当地的水质条件。若水质泥沙含量较大，则应选用温式潜水电泵，反之，则应选用干式潜水电泵。具体泵型的选择，应考虑以下两点：１．潜水泵的流量选择流量的选择一... 相似文献
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怎样选择潜水电泵的配带电缆？山西省农机鉴定站赵伟井用潜水电泵，需用长距离的配带电缆将电能送至在水下运行的潜水电机。配带电缆的价格，约占潜水电泵成套总价的２０～３０％，电机容量越大，电泵安装越深，电缆费用的比例也越高。因此，如何正确选择电缆，既保证潜水... 相似文献
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在大量统计资料的基础上，结合小型潜水电泵的有关标准，分析了小型潜水电泵产品泵的效率，提出了一些提高小型潜水电泵 产品泵效率的措施。 相似文献
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我厂是生产小型潜水电泵的专业厂，主要生产“鲁安”牌QY系列潜水电泵、WQ系列污水污物潜水电泵、QDX系列单相潜水电泵，Y系列电机及各种泥浆泵、纸浆泵等五大系列、三十二种规格的产品，其中WQ系列污水污物潜水电泵1993年荣获中国消费者协会颁发的’93全国消费者信得过产品证书。以质量求生存，以效益求发展是我们的治厂之本，要保证产品的整机质量， 相似文献
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Overland water and salt flows in a set of rice paddies 总被引：1，自引：0，他引：1
E. Playn O. Prez-Coveta A. Martínez-Cob J. Herrero P. García-Navarro B. Latorre P. Brufau J. Garcs 《Agricultural Water Management》2008,95(6):645-658
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. 相似文献
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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。 相似文献
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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。 相似文献
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对《种子法》存在问题的探讨 总被引：1，自引：0，他引：1
李鹏 《农业机械化与电气化》2011,(6):129-130
《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。 相似文献
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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. 相似文献
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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。 相似文献
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Gunter Wriedt Marijn van der Velde Alberto Aloe Fayçal Bouraoui 《Agricultural Water Management》2009,96(5):771-789
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. 相似文献
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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。 相似文献
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车辆ABS控制算法的研究及探讨 总被引：1，自引：0，他引：1
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。 相似文献