除污器堵塞对供暖系统的影响

作者结合工程实例,分析除污器堵塞现象对供暖系统的影响,提出应定期清理。     

永丰草地的类型及其生产力评估

本文描述了甘肃省天祝县永丰草地的主要草地类型、生产能力及利用模式。研究工作显示,草地改良措施,对不同植被的生物量分布,将产生显著的效果。灌溉和施肥,将促进河谷草甸的地下生物量向地上生物量的转化过程。灌溉可使河谷草甸中禾草组分的增加超过50％,使产草量增加50％～100％。上年秋天和当年春天土壤的含水量,是全年产草量的决定因素,其对产草量的重要性超过全年平均降水量的影响。除了植被组分、产草量的变化外,河谷草地在可消化粗蛋白、可消化能、代谢能等方面也有重大变化,9月份与4月份相比,这三项指标分别高出376％、86％和86％。不同年龄组的绵羊饲料消耗显示,7岁羊的饲料消耗是10月龄羊的17倍;但是7岁羊的胴体重量仅是10月龄羊的2倍。根据永丰滩草地、饲草、家畜的这些特点,当地的畜牧业,不应当在毫无经济意义的情况下,保持太多的牲畜头数,优化畜产品生产的最好方法,就是实行季节畜牧业。季节畜牧业(其中繁殖母羊数达67％)与其他草地改良措施相结合,将使该地区单位面积上的绵羊的产肉量提高4.9倍。     

哈尼族传统人居环境体系中森林要素之作用评述

从不同角度评述了森林在哈尼族传统人居环境体系中的作用和地位，阐述了未来山区村镇发展中保留周边森林的重要性。     

河南省农业综合生产能力的评价研究

本文建立了农业综合生产能力的评价指标体系，讨论了两种评价方法，并通过计算机测评系统，对河南省农业综合生产能力进行了系统的测算和分析。     

我国住宅现代化生产相关问题研究

本文从我国住宅产业发展现状入手,针对我国住宅现代化生产相关问题进行分析和研究,提出住宅产业现代化的是解决住房矛盾的前提、模数协调是住宅现代化生产的技术基础、认证制度是住宅现代化生产的有力保证、住宅性能评价体系是住宅现代化生产的重要内容的观点,对当前形势下我国住宅产业的发展方向具有一定的指导意义。     

二阶拟线性椭圓型Euler方程组解的Pohozaev型恒等式及其应用

本文对于二阶椭圆型Euler方程组 -∑D_αF_(q_α~i)(x,u,Du)+F_(ui)(x,u,Du)=0得到了一些积分恒等式,利用这些恒等式证明了某些方程组非平凡解的不存在性。     

“两田制”与农业双层经营

虽然双层经营体制已经得到确立,但至今其经营客体或对象在实践中仍然是不清楚的,而且就统分结合两方面来看,统的职能也严重不足,致使家庭经营的弊端依然存在,双层经营的功能难以充分发挥.为此.笔者提出,“两田制”是完善双层经营体制的有效形式。它有利于实现农业的适度规模经营,可大幅度地提高农业劳动生产率和农产品商品率,还形成了农村劳动力合理流动的机制,有利于农村经济的全面发展和农业机械化的推广。所以,笔者主张,“两田制”应谈有计划地加以推广.     

Analysis on Mineral Element Contents in Associated with Varietal Type in Core Collection of Yunnan Rice

Eight-element contents of 653 unpolished rice samples harvested from Xingping experiment farm, Yunnan Province under the same ecological conditions were analyzed by ICP-AES method. The mineral elements content were closely related to low diversity, high-yielding, and multi-resistance breeding; The K, Mg, Ca and Mn content in high-yielding and resistant varieties were high, and other nutrients such as P, Fe, Zn and Cu were low, which was connected with the heredity and physiological mechanism of mineral nutrients. There is zonal distribution of mineral elements content from Yunnan rice, especially for P, Fe, Zn and Cu co-related with the diversity center, paddy versus upland, glutinous and non-glutinous, glume-hair versus nuda, rice color, rice flavor, soft rice versus non-soft rice, but it did not find any association with indica-japonica types. The results supported the ecological variety group view of 5-grade taxonomic system “species-subspecies-ecological groups-ecological variety groups - varietal types“ .     

Experiment Research on Leachate Treatment of Sanitary Landfill for Municipal Solid Waste

It is difficult to treat landfill leachate in China.Traditional biologic method and physical method always have high expenses,or cann''t reach the discharge standards.The authors use a new biologic method to treat landfill leachate,which is the Wood_microbial System from Japan.The system to be digested by 3 aeration tanks and 1 reaction tank.The comparison combine processed wool_dust broken pieces with the certain grain degree size were throw in the tanks.Dirty and organic matter are in the digest tanks through the aeration reaction and aneration reaction repeatedly.In this experiment the speed of wastewater discharge and oxygen supply has been changed, and the change of biologic system and the effect of pollutant are removed. The optimal treatment condition can be found.The experiment shows that the system has a good result,special for nitrogenous.The BOD is average to do away with the rate to amount to 90%,almost reach the second class or third class for leachate standard.But BOD loading should be not beyond 4 kg/(m 3.d),othrwise,the system will not operate in normally.