三轴深层搅拌桩止水帷幕在某基坑支护工程的应用

文章以某大楼基坑支护工程为例,主要介绍了三轴深层搅拌桩的施工工艺及质量保证措施,供类似工程参考。     

Hair can be a good biomarker of occupational exposure to mercury vapor: simulated experiments and field data analysis

Generally, urine mercury (U-Hg) is widely used for assessment of inorganic mercury (I-Hg) exposure in humans. The reliability of scalp hair as an indicator of mercury vapor exposure is contentious. However, significant correlations were found between hair total mercury (T-Hg) and U-Hg and between hair I-Hg and total gaseous mercury (TGM) in ambient air in our previous studies. Simulated experiments were designed to assess the contribution of direct absorption/adsorption of mercury vapor in the hair. Results indicated that the increases of hair T-Hg concentrations were less than 1 μg/g, which was negligible compared with hair T-Hg concentrations in occupationally exposed workers. The β-mercaptoethanol washing can remove 30% of mercury (Hg) in the exposed hair samples. The inhaled Hg constituted the major fraction (97.4%) of I-Hg exposure for the artisanal Hg mining workers. From the simulated experiments and field data analysis, we can conclude that hair I-Hg can be a useful tool for monitoring occupational exposure to Hg vapor.     

Continuous monitoring of short term dissolved oxygen and algal dynamics

Dissolved oxygen (DO) in coastal bays with frequent algal blooms can undergo significant diurnal changes. Short-term DO and algal dynamics in a sub-tropical, nitrogen-limited, marine ecosystem are studied by means of a specially designed telemetry system. The high resolution data show clearly the importance of the vertical DO structure, and its relationship with environmental variables (solar radiation, water temperature, wind, tidal current) and phytoplankton dynamics. The design, instrumentation and calibration, and operational experience of the system are described. The simple and robust system has proved useful in (i) providing continuous data for full testing of water quality models, and (ii) the planning of field experiments to study algal dynamics.     

灭火救援理论和技术装备发展的需求分析

如何提高灭火救援理论和技术装备的整体水平，已成为当前公安消防部门面临的一个重要课题。对我国公安消防部队灭火救援理论和技术装备的发展进行了研究，从灭火救援实战的角度提出了当前灭火救援理论需要研究的主要课题，以及未来几年灭火救援作战和训练装备改革创新的重要需求。     

多曲面建筑不均等轴线的定位测量技术

上海中山医院综合楼由法国思构设计有限公司设计，体形奇特，曲面颇多，用传统的定圆心拉半经的方法无法做到精确定位．为此，借助AutoCAD技术，采用定位控制线方法来确定直线轴线，建筑外围弧形轴线则根据弧长加矢高来实现定位，取得了预期的效果．     

多阶变截面杆弯曲自由振动的计算

本文通过引入一组用矩阵形式表示的基本函数,分解了单阶杆的精确解,导出了相应于多阶变截面杆的频率方程和振型函数的通式,并通过计算机处理得到了精确数字解。最后还给出了数值解与理论解的比较。     

水景住区设计的新构想——“衡水天元—怡水花园水景公寓”项目设计

通过回顾衡水天元—怡水花园水景公寓设计过程,表述了尊重自然、因地制宜的设计理念,把建筑与环境融合,凸显了滨水住区的特色,营造了高品质的人居环境。     

电能回馈式传动系疲劳寿命试验台的研制

为解决现有传动系疲劳寿命试验台能耗大的问题,研制开发了一种以直流测功电机为加载器、数字直流可逆调速器为控制器,将直流测功电机产生的电能回馈到电网的传动系疲劳寿命试验台。该装置的电能回馈率达76%左右,节能效果显著。     

浅析工程造价咨询项目的风险管理

随着近年来工程造价咨询业务的发展，风险管理已显得日益重要，本文围绕工程造价咨询项目的各个阶段，即签订合同阶段、咨询准备阶段、项目实施阶段、校核和出具成果阶段、收尾工作阶段，分别重点阐述了造价咨询项目存在的风险和相对应的控制措施。     

毛主席纪念堂屋面维修设计施工及问题分析

毛主席纪念堂经过近20年的使用，由于屋面防水材料老化等原因，需进行维修。维修中对下层屋面和下檐天沟两大部位分别采取了相应的治理措施。维修实践证明，在设计时应仔细考虑基层结构与温度变形作用及材料的耐久性问题，以免造成渗漏。