Effect of agricultural extension on cotton farmer's efficiency in arid and semi-arid areas of Burkina Faso

This study shows that farmers in arid and semi-arid land can improve their efficiency if they have access to agricultural extension services. An exhaustive survey was used to obtain data from 423 cotton producers in the arid zones and 144 of wetlands in Burkina Faso. The method of the directional distance function modeling a multi-output technology was used. The results show that cotton farmers in the arid zones are not technically more inefficient than those in wetlands. On average, arid zone producers have a technical inefficiency of 0.056 while that of wetland producers is around 0.052. The agricultural extension, defined as receiving visits and advice from technical agents, is important for producers because it helps farmers choose soil and water conservation techniques and fertilizers adapted to the Agro-climatic conditions of their respective zones. Agriculture extension also helps farmers of the arid zones to reduce their technical inefficiency by advising them to cultivate small agricultural plots. On average, in these zones, the size of an agricultural plot is around 1.03 ha compared to those of wetlands which is about 1.6 ha.     

工厂供配电系统运行和维护的安全技术要求

工厂供配电系统触电事故以及电气火灾和爆炸事故时有发生,不但影响生产,还造成巨大的经济损失甚至人员伤亡。介绍了工厂供配电系统运行和维护的安全要求,主要包括变配电所的运行和维护、电力线路的运行和维护及其他安全管理要求。     

某铁路站区供热系统节能技术改造效果评估

针对某车站供暖成本升高和污染物排放等问题,从热源改造和建筑维护结构改造2个方面提出节能技术改造方案,通过对机组运行情况和围护结构改造情况的现场测试,得到节能技术改造效果良好的结论,并从节能效益、经济效益和环保效益3个方面对站区节能技术改造方案效果进行分析.     

地下土壤渗滤沟的工艺构造对氮磷去除的影响

通过对比标准型、深型及浅型毛细管这三种不同构造的地下土壤渗滤沟去除模拟农村生活污水氮磷的效率,讨论了渗滤沟构造对氮磷去除效果的影响。结果表明,三种渗滤沟对氨氮、总氮和总磷的去除率均分别可达95%、80%、90%以上。毛细管型构造渗滤沟在布水均匀性、稳定性及氮、磷去除效果等方面均优于标准型构造的渗滤沟。     

油脂废水处理方法探讨

针对油脂废水处理加石灰产生二次污染提出改进方法,采用厌氧技术用硫酸盐还原菌(Sulfate-ReductionBacteria,SRB)降解硫酸根,并在探讨性试验中得到初步验证。     

何家寨隧道地质灾害整治实践与探讨

贵州水柏铁路何家寨隧道,工程地质条件极其复杂,集“高瓦斯、强岩溶、大涌水”为一体,施工期间曾发生多次涌水涌砂、洞内坍方、地表塌陷与滑坡、支护衬砌开裂变形等地质灾害,堪称水柏铁路施工难度最大的“烂洞子”。文章结合该隧道地质灾害的整治实践,就有关设计与施工技术问题进行探讨。     

徐州市环保产业的发展现状及对策研究

近几年来，徐州市经济发展迅速，但环保产业发展相对滞后，文章分析了徐州市环保产业的发展现状和存在的问题，提出了相应的解决措施，希望能够对徐州市环保产业的发展起到一定的促进作用。     

提高高校实践教学质量的探索

实践教学在以培养学生应用能力为主的高校中一直是一个热点话题.本文针对实训这一实践教学手段,从职业能力培养观念的加强、课程实训模式的创新以及实训考核监督机制的建立三方面着手,探讨了提高实践教学质量的方法.     

顺德安普连接器有限公司电镀废水处理工程技术评估

针对顺德安普连接器有限公司的生产工艺 ,对环境工程方案提出的污染物治理流程、主要污染物因子削减措施进行了分析、评估 ,以判断污染物达标排放的可能性     

A policy and technical measures for controlling soil and water loss in the Loess Plateau of China

Loess Plateau is the most serious region of soil and water loss in China and the world. The sediment carried into the Yellow River amounts to 1.6 billion tons every year. This paper reviews the factors and reasons for erosion in this area, and puts forward a comprehensive controlling policy on the basis of the principles of ecology and practise of Chinese scientists for 40 years. In conformity with the policy, a number of technical measures for controlling soil and water loss are suggested.