桂中治旱乐滩水库引水灌区一期工程隧洞设计

乐滩水库引水灌区一期工程隧洞12座,总长为48.77 km,均为无压隧洞,针对隧洞从村屯附近穿越、长距离、低水头、大流量的特点,设计有针对性地提出了一些新观点。结合工程实际,从洞线选择、进出口布置、合理加大隧洞水深、减糙衬砌混凝土使用、TBM法施工应用等简述其设计要点。     

圆弧直墙平底量水槽试验研究与示范推广

灌区量水是灌区实现＂总量控制＂和＂定额管理＂的基础性工作.通过圆弧直墙平底量水槽试验研究和示范推广,为我省灌区防洪度汛、抗旱、供水调度、计量收费提供科学依据,改善管理人员测流工作环境,减轻工作人员劳动强度,提高测流精度和测流工作效率,节约管理费用开支,提高灌区的现代化管理水平.     

药湖联圩舍埠排灌站基础处理方法

舍埠排灌站基础在施工过程中遇到了流沙,出现了管涌现象,边坡塌方严重,基础受到破坏.必须采取相应的措施,进行加固处理,保证地基的稳定.本文结合实践和经验,介绍以松木桩加块石挤淤的方法来处理基础.     

簸箕李灌区徒骇河渡槽改建工程施工技术研究

本文介绍了徒骇河渡槽改建的原因、基本情况和施工方案,分析总结了在特定的施工条件下,改建施工中采取的一系列技术措施及效果。徒骇河渡槽改建工程的成功实施对同类水工建筑物建设具有重要的借鉴和参考意义。     

膜下滴灌技术在吉林省的应用研究

膜下滴灌技术是近年来在干旱和半干旱地区广泛应用的一项技术,从吉林省西部近年来的应用推广情况来看,其在节水、改善生态环境和粮食增产等方面效果显著,并显现出对不同区域、不同作物品种的效益机制的反应各有所不同。因此,本文仅基于玉米在膜下滴灌条件下的不同给水条件的生长变化机制研究成果,对原有灌溉制度的相关参数,如灌水次数、灌水强度、灌水时间等进行适应性修正。提出了基于在膜下滴灌条件下,通过调亏灌溉密植补偿效应提高单位产能的灌水机制。结果表明,结合调亏灌溉技术可改变作物的生殖生长特征,提高作物品质和土地容量,实现增产增收。     

THE UNSOLVED MESSAGES OF PEARL HARBOR

In 1941, the United States Navy intercepted enough Japanese naval messages to predict the attack on Pearl Harbor if the code which protected them had been solved. The messages would have disclosed that, while the Japanese government cynically conducted diplomatic negotiations with the United States, the Japanese Combined Fleet under Admiral Isoroku Yamamoto, beginning as early as September 1941, systematically prepared ships, crews, weapons, tactics, and a complicated fuel supply system for the most ambitious operation ever undertaken by the Japanese navy. Details of Japan's intentions were hidden from Navy cryptanalysts because of limited manpower resources and because all Japanese navy codes were assigned a lower priority than Japanese diplomatic codes and German submarine threat.     

Microirrigation Lateral Design using Lateral Discharge Equation

A simple and accurate method is developed for designing single, paired, and tapered microirrigation laterals. The hydraulics of the lateral is evaluated using a lateral discharge equation approach. A simple power equation is used to express the relationship between the inlet flow rate and inlet pressure head of the lateral. Keeping the flow variation within the specified limit, a procedure for designing the length of the tapered section is developed. The lateral is designed using a step-by-step method. The length of the tapered section is determined by the golden section search method.     

关于贺州市平桂管理区城投服务大厦施工质量与安全控制的几点体会

通过介绍广西壮族自治区贺州市平桂管理区城投服务大厦工程施工质量与安全控制,特别是基础工程、挡土墙工程、模板及脚手架工程、装饰装修工程等,指出一些工程施工质量与安全控制问题,并提出相应的控制措施,以供借鉴.     

The demand for energy for irrigation in the USA

There seems to be some question concerning the relationship between irrigation and the price of energy. Did changes in the price of energy actually impact irrigation in the USA? Additionally, the substitution between alternative types of energy seems to be a possibility for irrigation. Whether in fact it occurred is another matter. In this study, an appropriate model is developed and estimated to address the issues. The specific energy types considered include motor gasoline, diesel fuel, liquefied petroleum gas, natural gas and electrical energy. The results for 1978 and for 1980 clearly indicate that energy use for irrigation is responsive to the price of energy. Additionally, some substitution between energy types took place during this period. Finally, when the question of the stability of the demand for the various energy types is addressed, the suggestion is that the demand for the energy types considered was stable for the 1978 and 1980 periods.     

渗灌专用打孔器的研制

渗灌专用打孔器是针对渗灌的关键技术问题即堵塞问题和均匀度问题而研制的一种专用打孔器，采用这种打孔器打孔可以去掉孔中的塑料圆柱体，成孔规则、均匀、无毛刺，不会形成塑料体回缩，对于延缓堵塞和提高灌水均匀度具有很大的促进作用。