疏浚吹填工程推行项目经理责任承包制管理模式的探讨

阐述了传统管理模式的生存条件及其弊端,对疏浚吹填工程推行项目经理责任承包制管理模式进行了探讨.     

Construction Productivity Improvement

Construction productivity has been on the decline in the last decade. The results are presented on a survey of the Engineering News‐Record 400 largest contractors to obtain their views on where productivity improvements would most help and to compare the trends with a similar survey carried out in 1979. Data were collected on the general company characteristics of the responding contractors, and on the contractors' opinions on potential areas for productivity improvement in the office and in the field. Findings indicate that immediate research should concentrate on improving marketing practices, planning and scheduling, labor‐management relations, site supervision, industrialized building systems, equipment policy and engineering design; and that governmental regulations have lost the immediate urgency attached to them in 1979.It is also recommended that similar surveys be conducted every 3 to 4 years to identify new trends and to steer research in the appropriate direction.     

Rapid analysis of polymer homologues and additives with SFE/SFC-MS coupling

A rapid and easy analysis method for polymers is presented. The method involves sample preparation by SFE, separation of the extracted compounds by SFC and simultaneous quantitative detection by FID, as well as identification of unknowns by MS. The applications illustrate how structural research work and routine polymer analysis can be done with this time saving method.     

南水北调中线总干渠水头优化分配

南水北调中线总干渠渠道线路长,建筑物数量大、类型多,进行水头优化分配对于节省工程投资,合理的进行总干渠工程布置有着重要的意义.通过优化计算,提出了总干渠水头优化分配方案,确定了3个渠段之间的水头分配值以及各段内分段渠道和各个建筑物的水头分配值,并对方案进行了验证.     

三峡永久船闸结构缝渗漏处理技术

在三峡永久船闸结构缝处理过程中，认真分析了结构缝渗漏的原因，通过止水检查槽进行压水检查，确定了渗漏部位。结合渗漏具体情况，采取了结构缝表面嵌填止水材料和廊道周边止水检查槽灌浆相结合的处理方法。在实施过程中，采用了多种新材料和新工艺，取得了良好的效果。     

三峡工地高压供电线路故障判断方法的探讨

高压供电设备故障特别是输电线路的高压接地故障对工地的影响是相当大的。由于接地故障为隐性故障，没有明显的物理现象，且若是长期接地可能会发展成较为严重的两相或三相短路故障，使系统解列运行直至崩溃；由于工地流动人员较多，还易造成电击事故。利用高压一相接地时在线路中产生零序电压这一特性来迅速判断和切除接地的用电设备，可以保证各项施工的顺利进行。     

Natural isotope fractionation in the discrimination of sugar origins

More than 500 carbohydrate samples have been characterised by hydrogen, carbon and oxygen isotopic parameters measured on ethanol and water resulting from controlled fermentation. Different chemical states of the carbohydrate pool have been considered: polysaccharides from cereals, tubers and leguminosae (maize, sorghum, rice, wheat, barley, potato, bean), glucose, fructose and sucrose from fruits (pineapple, citrus, apple, soft fruits), sucrose from sugar plants (beet, cane). The overall carbon-13 content of ethanol and the deuterium and oxygen-18 contents of water before fermentation were determined by mass spectrometry of isotope ratios whereas the investigation of site-specific natural isotope fractionation by deuterium NMR has provided access to the deuterium contents in the methyl (I) and methylene (II) sites of ethanol. The results have been analysed in the multidimensional space of these isotopic variables. Hierarchical clustering, principal component and discriminant analyses have been performed. Among fruits, for example, the pineapple group exhibits a 100% discrimination with respect to the apple and citrus groups which are themselves well distinguished. A still higher discrimination is reached between the three groups, citrus, cane and beet, and the addition of 10% exogenous cane or beet sucrose to citrus juice is unambiguously detected.     

鹰嘴岩隧道软弱破碎岩体的开挖与施工

渫水皂市水利枢纽左岸上坝公路鹰嘴岩隧道围岩主要为Ⅱ、Ⅲ、Ⅳ、Ⅴ类围岩，地质条件复杂，成洞条件差。在隧道施工中，遵循“短进尺，弱爆破、少扰动、早支护”的原则，及时进行监控量测，采取有效的加固措施，取得了良好效果，确保了工程进度与安全。     

Virtual Teams: Guide to Successful Implementation

The successful initiation and execution of a virtual team is gaining increasing attention in the design and construction community. From opportunities to integrate international and multidisciplinary teams to the opportunity to leverage the best resources in an organization on a given project, virtual teams can transform the concept of project planning and execution. However, potential barriers exist in several areas to the successful implementation of virtual teams. The needs of increased management emphasis, social and cultural understanding, and emphasis on common goals are only a few of the nontechnical factors that can turn successful virtual teaming into virtual frustration. When combined with traditional technical challenges including compatibility of systems, security, and the selection of appropriate technologies, the line between leveraging virtual technologies for enhanced solutions and introducing additional complications into the project process is one that can be easily crossed. This paper presents the findings of research that addresses the opportunities and potential barriers to successful virtual teams in the engineering, procurement, and construction industry. Combining results from current research, industry practices, and early results from nonconstruction industries, the research findings provide an initial path to successful virtual team implementation.     

南水北调卢沟桥暗涵工程混凝土碱骨料反应及预防措施

碱骨料反应是混凝土工程的重大隐患之一，卢沟桥暗涵工程根据其反应机理，采取相应预防措施，以确保工程质量，提高暗涵工程的耐用性。