提高35kV户外熔断器接线端帽更换效率

35 kV户外限流熔断器在电力系统中具有非常重要的作用,它的主要作用是用于35 kV小型户外设备的短路保护。由熔体套、瓷套、接线端帽、弹簧组成。安装位置:一般安装于变电站内35 kV电压互感器上端和35 kV所用     

提高数控铣床生产效率的方法

影响数控铣床加工效率的因素很多,也很复杂。在数控的教学实践和对企业的调查中发现:可以从加工路线、刀具、安装夹紧、切削用量、刀具预调或自动测量、正确的维护保养、加强培训等几个方面着手,缩短换刀时间,实现快速加工,从而达到提高数控铣床加工效率的目的。     

如何提高农业机械的使用效率和寿命

农业机械业在快速的发展着,之前的人力劳动已经转变为机械劳动,当前重要工作是提高农业机械的使用效率和使用寿命,这样农业机械才能得到持久性发展,增加农民的收入。要想提高农业机械的使用效率和寿命必须从农业机械的养护和维修中入手,改善农业机械的发展环境。同样的农业机械面对不同的使用者的使用效率和寿命是不同的,其差距是因为使用者的机械管理使用方法,在机械使用过程中,要坚持机械的维护和保养,机械发生故障时要及时维修,最大限度的增加机械的使用寿命,这也是保障机械使用效率的最有力方法。     

提高分裂导线施工效率的方法

在架空输电线路中,通常采用增大导线直径的方法来消除电晕损耗,因此,分裂导线在输电线路系统中得以普遍运用.笔者在双分裂导线施工中,通过不断地摸索和总结,对施工方法进行了改进,由原来使用两套牵引系统同时收紧两根子导线后进行高空画印,改为一套牵引系统对一根子导线进行弧垂观测后进行地面画印,并利用滑车平衡两根子导线后,确定另一根子导线线长,大大提高了施工效率.     

KDF-1．1型地膜覆盖机的使用及故障排除

地膜覆盖技术能提高地温,保墒保肥,改善水、肥、温度、光照等作物生长条件,早播早收,促进作物增产,增加农民收入。同时能减轻劳动强度,质量好,省时省工效率高,深受广大农民欢迎,在日益广泛的使用中用户应该了解使用注意事项和故障排除等知识。     

浅述电气设备安装工艺的控制

在科技迅猛发展的今天如何采用技术手段,保护建筑物内电气设备的正常使用,电气设备的安全及电气设备的使用安全,成为摆在我们安装技术人员面前的首要问题。     

机电设备安装运行的异常现象及对策

目前,由于国产设备的技术水平和加工水平,与国外的技术设备有较大的差距,关键设备大多引进国外技术设备,其整体及配件价格十分昂贵.为了提高企业经济效益,这就要求机电设备维护人员对设备的一些异常现象,做到分析原因提出解决对策,降低设备故障减少设备维修费用.     

旋转式七工位门转毂设备换模效率提升改进

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试论矿山机电控制中PLC技术的有效应用

在矿山工业自动化控制的领域,PLC作为一种控制设备,起着举足轻重的作用。文章分析了PLC技术的特点与工作原理,进而探讨了矿山机电控制中PLC技术的实际应用。     

抚松县区域电网建设

根据县电网的现状,在负荷预测及电源选定的基础上,对电网进行统一规划,正确选定电压等级、接线方式和变电站布局,使电网达到可靠、灵活、经济,安全的标准。     

发动机润滑系的常见故障分析与处理方法

润滑系技术状况变坏的明显标志是机油压力降低和机油变质,机油压力过低或过高,都说明润滑系工作不良,甚至会造成严重事故。文章从润滑系的常见故障,找出引起故障的原因进行分析,从而对它们进行诊断及排除。     

Measuring the technical efficiency and exploring the inefficiency determinants of vegetable farms in Samsun province,Turkey

The purposes of this research were to measure the technical efficiency of sample vegetable farms and subsequently to explore determinants of technical inefficiency in the Samsun province of Turkey. Stochastic Frontier Analysis was used to measure technical efficiency. Farm managers from 75 randomly selected farms were interviewed for farm level data in the 2002–2003 production periods. Research results revealed that the average output of vegetable farms in Samsun could increase by 18% under prevailing technology. The technical efficiency of the sample vegetable farms ranged from 0.56 to 0.95 (0.82 average). The variables of schooling, experience, credit use, participation by women and information score negatively affected technical inefficiency. However, age, family size, off-farm income and farm size showed a positive relationship with inefficiency. Therefore, this study proposes strategies such as providing better extension services and farmer training programs, integrating women into the training and extension programs, raising the educational level of farmers, and providing farmers with greater access to credit, to enhance technical efficiency.     

A measure for the efficiency of water use and its determinants,a case study of small-scale irrigation schemes in North-West Province,South Africa

This paper analyses the efficiency with which water is used in small-scale irrigation schemes in North-West Province in South Africa and studies its determinants. In the study area, small-scale irrigation schemes play an important role in rural development, but the increasing pressure on water resources and the approaching introduction of water charges raise the concern for more efficient water use. With the data envelopment analysis (DEA) techniques used to compute farm-level technical efficiency measures and sub-vector efficiencies for water use, it was shown that under constant returns to scale (CRS) and variable returns to scale (VRS) specification, substantial technical inefficiencies, of 49% and 16%, respectively, exist among farmers. The sub-vector efficiencies for water proved to be even lower, indicating that if farmers became more efficient using the technology currently available, it would be possible to reallocate a fraction of the irrigation water to other water demands without threatening the role of small-scale irrigation. In a second step, Tobit regression techniques were used to examine the relationship between sub-vector efficiency for water and various farm or farmer characteristics. Farm size, landownership, fragmentation, the type of irrigation scheme, crop choice and the irrigation methods applied showed a significant impact on the sub-vector efficiency for water. Such information is valuable for extension services and policy makers since it can help to guide policies towards increased efficiency.     

现代农业装备助推农业产业化发展

农业机械化和农业产业化是农业现代化的重要组成部分。通过分析农业装备在农业产业化经营的作用,明晰农业机械化与农业产业化的关系,找到农机与农业产业化的结合点,促进农业机械化和农业产业化和谐发展。