某大型地下室防水施工措施

本文介绍了某工程地下室针对不同部位采取的相应防水措施,做到防排结合、刚柔并用、多道设防、综合治理,收到良好的效果,供类似工程参考。     

大伙房水库引水工程TBM1标段施工影响因素分析

根据辽宁大伙房引水隧洞的TBM1—1标段的施工经验进行总结并分析了影响TBM掘进的主要因素，对后期以及其它标段的TBM施工有一定的指导意义和实际应用价值。     

Do Homeowners Have Higher Future Household Income?

Using longitudinal data from the Panel Study of Income Dynamics (PSID) between 1984 and 2001 among only renter households in 1984, this paper looks at the relationship between length of homeownership thereafter during that period and household income in 2001. The study found that the longer the period of homeownership during the studied period, the higher future household income was by 2001. It is estimated that each year of ownership is associated with approximately 2 per cent of increase in household income and doubling the length of ownership increases household income by about 11 per cent.     

A colorimetric method for ammonia in natural waters

An improved phenol-hypochlorite method for determining ammonia in water using nitroprusside as catalyst has been investigated. Unlike other recently published methods, the method is simple (and sufficiently sensitive for low-level analyses) and does not require accurate time intervals between reagents, not expensive equipment. The method is well suited for routine use.

Beer's Law was obeyed over the whole ammonia range investigated. Reproducibility was 1·3 per cent with 10 μg N, and 5·7 per cent with 1 μg N.     

国际航空货运枢纽港:以航空物流为新竞争优势

20世纪80年代以来,经济全球化促进了亚太地区的一些国家和地区的经济迅速增长,同时也带动了区内航空货运的发展.国际航空货运枢纽港(GTP:Global TransPark)是新经济背景下的一种新型货运机场,对提升区域竞争力有着重要的意义.我国有必要建设GTP,以期在21世纪电子商贸及高科技加工工业的发展上抢先建立滩头阵地.逐渐成熟的香港都会经济区有着"一国两制"的特殊地缘政治和制度优势,因而,在亚洲各竞争中的经济区域中,它是建设亚洲首个、也将是最大的GTP的最佳区位.GTP的建成运作可以提升该都会经济区的总体竞争力,加快其经济重构的步伐.结合区内的其它4个机场,珠海机场有条件发展成为GTP.然而,GTP的建设需要有关机场与地方政府间在关税、制空权、后勤服务以及水陆交通等方面进行协调,这将对该都会经济区的内部合作提出更新的挑战.     

也谈防水工程的招投标

政府采购招标是一种公开、公正、公平，与国际接轨的先进做法，是政府反腐倡廉的重要手段；通过公开招标，可以降低政府运作成本。通过对政府采购招标的几个案例的分析，指出专业防水工程在招标中存在的一些问题，以引起有关行业人士的关注与重视。     

三级、四级生物安全实验室的电气设计

高级别生物安全实验室建成和投入使用，可为我国医药和生物技术的发展创造良好的实验环境，对积极应对像非典、禽流感这样的突发疫情，有了可靠的基础设施保证。本文就三级、四级生物安全实验室在设计、施工中电气专业需重视的方面和要点结合规范展开分析。     

双向超长转换结构设计

本文通过对超长建筑无缝设计的意义的论述,对一个实际工程双向超长转换结构的转换形式进行了分析,对整体结构和转换梁进行了理论设计计算,最后提出了超长转换结构的主要构造措施,可供同行设计参考。     

Technique for measuring metallic salt effects upon the indigenous heterotrophic microflora of a natural water

The effects of several concentrations of the metallic salts Ag₂SO₄, NaAsO₃, BaCl₂2H₂O, CdCl₂2.5 H₂O, CrCl₂6H₂O, CuCl₂, HgCl₂, NaCl, NiCl₂6H₂O, PbCl₂ and ZnCl₂ upon the indigenous heterotrophic microflora of a natural water were studied. Effects of these salts upon the heterotrophic activity of the microbes were assayed using the heterotrophic technique whereas lethal effects upon the heterotrophic bacteria were determined using nutrient agar plate counts. The heterotrophic activity method is based upon the uptake and mineralization of a radioactively labeled metabolite (in these experiments ¹⁴C-glucose) by the indigenous aquatic microbes and data analysis is by Michaelis—Menten enzyme kinetics equations. Concentrations of metallic salts which resulted in bacterial death also caused erratic uptake and mineralization rates of ¹⁴C-glucose whereas sub-lethal concentrations, as determined by nutrient agar plate counts, caused a non-competitive inhibition of maximum heterotrophic activity and markedly increased the turnover time of the glucose substrate.     

冷却塔的飘水与冷效

分析了冷却塔飘水的原因及危害，认为塔内布水器结构是造成飘水的根本原因，通过研究开发出了水轮式旋转布水器，用于冷却塔后可消除飘水现象。