进口无轨设备备件供应工作的现状及建议

论述了目前进口无轨设备备件供应工作的供货渠道，指出了进口备件供应渠道选择工作中存在的问题和误区，提出了对无轨设备及备件管理的认识和建议。     

高层建筑外墙渗漏的对策

对深圳市大量高层建筑外墙渗漏的原因进行了分析 ,在对渗漏的根源进行研究的基础上 ,提出了几项改进措施 ,经施工实践 ,取得了良好的效果     

The leaching of inorganic species from activated carbons produced from waste tyre rubber

Waste tyre rubber can be used as a precursor for the production of high quality activated carbons. However, there is concern that inorganic impurities present in the rubber feed may restrict their use in liquid phase applications with high purity requirements. This paper presents an investigation of the presence and the leaching of inorganic species from activated carbons derived from waste tyre rubber. For the purpose of this work, a number of carbons were produced, characterised for their BET surface area and analysed for their inorganic composition. Subsequently, a number of tests were performed to evaluate the leaching of different inorganic species into solution at various pH values and carbon doses. Results showed that rubber-derived carbons contained elevated concentrations of sulphur and zinc, as well as traces of other metals such as lead, cadmium, chromium and molybdenum. Inorganic levels were significantly affected by production conditions, particularly degree of carbon activation and the nature of the gasification agent. However, leaching tests showed that the availability of these species in neutral pH conditions was very limited. Results demonstrated that, when using carbons doses comparable to those employed in water treatment works, only sulphur levels exceeded, in some occasions, health based quality standards proposed for drinking water.     

启动豆腐渣工程——我国开发与利用大豆加工副产品的方向构想

豆腐渣是大豆加工过程中的主要副产品，具有较高的营养价值。目前，我国对豆腐渣进行合理利用的开发研究工作较少，使这一部分可利用资源被浪费掉，其宏观统计数字十分惊人。豆腐渣的利用问题是一个牵扯到多地域、多层面的问题，国际上发达国家很重视对其合理开发利用的研究工作。在我国启动豆腐渣工程具有长远的社会、经济意义，而且刻不容缓。     

Polymeric active coatings with functionality in vascular applications

Copolymers containing functional groups with activity as antiaggregating agents for platelets, based on random chains of metacryloyloxyethyl [2-(acetyloxy)-4-(trifluoromethyl)]benzoate, TH, and 2-acrylamido-2-metylpropanesulfonic acid, AMPS, with AMPS molar fractions ranging from 0.1 to 0.4, have been prepared. The spectroscopical characterization and the in vitro swelling behavior have been studied, as well as the surface free energy, showing the copolymers an appropriate surface properties from a haemocompatible point of view. Preliminary in vitro tests using human blood have shown a promising antiaggregating behavior.     

Topological Fiber Entropy for Linear Flows on Vector Bundles

For linear flows on vector bundles, it is shown that the topological entropy of lower dimensional subspaces in the fibers is determined by the Morse spectrum over chain recurrent components of the induced flows on Grassmann bundles.     

某预埋槽钢拉拔性能试验及有限元分析

预埋槽钢是指将槽钢预埋在混凝土基材内,避免对建筑结构的损伤,其主要起连接固定作用。为了了解槽钢的拉拔性能,本文首先通过槽钢本体试验来了解其薄弱部位;再对预埋在混凝土基材中的槽钢进行拉拔试验,确定该试件破坏模式;最后根据试验提供的条件建立槽钢本体及预埋槽钢拉拔有限元模型,利用ABAQUS进行求解计算,分析槽钢本体承载力和预埋槽钢的抗拉承载力,并与试验结果进行比较,发现试验与有限元分析较吻合。     

Ultrasonic system for remote non-destructive testing using mobile telephony

In distributed non-destructive testing (NDT), the acquisition of ultrasonic measurements occasionally has to be performed at different locations distant from the central station, where the ultrasonic data must be analysed and displayed. In this paper, the design details of an ultrasonic system with such objective are described. The system aims to perform remote acquisitions and transmit them to a central station using mobile telephony. Ultrasonic and telecommunication sub-systems involved in this system are described. The practical implementation here depicted combines own-designed modules with some low-cost commercial devices. Some design consideration and the block schemes of each subsystem are detailed. Finally, a laboratory prototype, developed for design viability purposes, is presented. This development includes stages for: transducer driving by means of a high-voltage pulse generator, broad-band amplification, acquisition, multiplexing and A/D conversion of signals, ultrasonic data transmission by mobile telephony, and the control of telemetering aspects by remote and local software.