深层搅拌桩重力式挡土墙在基坑支护中的应用

文章结合工程的实际情况,阐述了深层搅拌桩重力式档土墙基坑支护的施工技术。深层搅拌桩重力式挡土墙,就是应用深层水泥搅拌桩组成重力式挡土墙作为基坑开挖的土体支护和止水手段,是深层水泥搅拌技术的扩展应用,与目前常用的基坑支护如钢板桩、混凝土桩相比较,其具有施工时振动小、挤土现象轻微、抗渗性能好、整体稳定性好、工程造价低等优点。通过对基坑工程周边环境及施工难点分析,选择深层搅拌桩重力式挡土墙支护方案,并结合工程具体环境采取相应的补充方案解决对策,达到了预期的目标。     

水泥搅拌桩在黄骅港煤堆场工程中的应用

本文通过对黄骅港煤堆场水泥搅拌桩工程实例的分析,叙述了深层水泥搅拌桩在吹填土地基中的施工工艺及流程,指出了软土地基条件下水泥搅拌桩施工中常见的问题及解决方法。为类似条件下水泥搅拌桩的施工提供了有益的借鉴。     

深层水泥搅拌桩软基处理质量控制技术探讨

将深层搅拌桩应用于路基施工,经过这么多年的发展已经形成喷浆和喷粉两大系列的深层搅拌桩施工技术,并广泛应用于公路与城市道路工程之中,本文通过对广州新客站地区市政道路及相关附属工程施工总承包第四标段为例,分析影响水泥搅拌桩的主要因素,提出深层水泥搅拌桩的施工工艺措施及注意事项,并对此技术在路基施工中的应用做进一步分析与探讨。     

小议软基处理水泥深层搅拌桩施工控制

软基处理工程是一项复杂、繁琐的施工项目,而水泥深层搅拌桩是目前软基处理中最有效的办法之一。那么,这就对水泥深层搅拌桩施工质量有着严格的要求。但是,就我国目前水泥深层搅拌桩施工现状而言,其中存在很多的问题和不足,施工准备工作不充分,没有对施工质量进行严格的控制,严重影响了软基处理质量,埋下一定的安全隐患,极大的威胁了人们的生命财产安全。因此,本文针对软基处理水泥深层搅拌桩施工问题进行研究讨论,结合目前我国软基工程现状做出论述,总结出以下先关结论,以供参考。     

深层水泥搅拌桩的应用与施工

深层水泥搅拌桩是进行软基处理的一种有效形式。简单介绍深层水泥搅拌桩在某水库排洪河工程中的应用,并分析在实际施工中控制施工质量应注意的几个要素。     

长江堤防防渗技术中多头小直径深层搅拌桩技术

多头小直径深层搅拌桩方案属于一类垂直型防渗方法,由于其经济性优势获得了广泛的应用.本文详细介绍了深层搅拌桩方法作为一类垂直类型的防渗墙,其在长江流域中的深厚砂质堤基部位防渗处理工程中的实际应用效果、工程参数的有关规定以及作业过程中可能遇到的各类问题.对于比较密实的深厚砂质的地基部位搅拌桩钻进出现困难的成因进行了研究和分...     

浅议深层搅拌桩加筋施工技术及其工程应用

目前建筑工程施工过程中,深层搅拌桩加筋施工设备以及施工技术的应用已经普及。深层搅拌桩加筋施工技术可以有效解决单靠芯材自重下沉所产生的困难,大大提高刚性材料下沉效率,达到标准深度,并且插入后的性能得到保障,改善传统搅拌桩施工中常出现刚性材料偏、斜等现象。深层搅拌桩加筋施工设备功能性较强,操作简单、灵活性强,可移动,提高施工质量,为在基坑支护以及地基处理等工程中发挥重要作用。     

浅谈水泥深层搅拌桩施工方法

某工程截水墙工程采用深层水泥搅拌桩进行施工。对施工采用的搅拌技术进行分析。     

桩列式连续墙深基坑支护施工技术

本文在无法进行围堰干施工的前提下,节制闸采用了桩列式复合连续墙的施工方案,成功的应用了由钻孔灌注桩结合深层搅拌桩以及利用PHC锤击管桩作为锚桩的节制闸支护结构,对桩列式(灌注桩)连续墙、水泥搅拌桩应用于节制闸的施工技术进行了探讨。     

简述深层水泥搅拌桩施工控制

如何有效地控制深层水泥搅拌桩的成桩质量,确保软基处理的效果,是我们在工程实践中探索的一个课题。谈谈深层水泥搅拌桩施工控制。     

Students' Reactions to the Introduction of Videoconferencing for Classroom Instruction

This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.     

Cooler temperatures inductive to locust outbreaks

Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.     

To serve and promote science development via innovation

CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing.     

The Role of Intermediating Institutions in the Diffusion of Electronic Data Interchange (EDI): How Industry Associations Intervened in Denmark, Finland, and Hong Kong

Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.     

Tracing the origin and early radiation of birds——Paleornithologist ZHOU Zhonghe

With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants."     

How Electronic Publishers are Protecting Against Piracy: Doubts About Technical Systems of Protection

The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.     

Rough Justice: A Statistical Assessment of ICANN's Uniform Dispute Resolution Policy

Long-standing conflict between domain name registrants and trademark holders prompted the Internet Corporation for Assigned Names and Numbers (ICANN) to create a global, mandatory arbitration procedure known as the Uniform Dispute Resolution Policy (UDRP). The UDRP has been used in 2166 cases involving 3938 domain names as of 1 November 2000. The policy gives the initiator of a complaint, generally a trademark holder, the right to choose which ICANN-accredited dispute resolution service provider (RSP) will handle the case. During the preparation of the UDRP,some feared that complainant selection would lead to "forum shopping" that might bias the results. This article performs a statistical assessment of the forum-shopping thesis and finds support for it. There are statistically significant differences in the various RSPs' propensity to take away names from defendants; there are also major differences in the number of cases brought to each RSP. RSPs who take away names have the larger share of cases. The study examines other variables that might explain differences in market share, such as price, the plaintiff's nationality, or the time taken to decide a case. It finds that nationality and time also are correlated with market share. The study concludes that shopping for a favorable outcome is an important factor in the UDRP.     

Prevalence of soft neurological signs in Chinese people

Prof. Raymond C.K. Chen, a neuropsychologist with the CAS Institute of Psychology, has made novel progress in his studies of schizophrenia. His work has been reported by a recent issue of Behavioural Neurology.     

Monoculture Rubber Plantations Have Negative Ef ects on Controlling Splash Erosion

<正>In Xishuangbanna,one of China’s most biodiverse regions,landscape has changed dramatically during the past three decades due to the conversion of tropical rainforest to rubber plantations.In steep areas,terraces are often constructed before planting rubber trees,which causes two important changes in the soil:the destabilization of soil in the bench terraces and the increased vulnerability of unvegetated riser faces to erosion.Few studies have documented the nature and intensity of erosion on bench terraces.Prof.LIU Wenjie and his colleagues from the Xishuangbanna Tropical Botanical Garden(XTBG)conducted a study in Menglun County(21°5′39″N,101°15′55″E),Xishuangbanna to evaluate the influence