点支玻璃幕墙设计建议

《玻璃幕墙工程技术规范》(JGJ10 2 -96 )中未包含点支玻璃幕墙的有关内容 ,即将修订的JGJ10 2规范将增补这方面的条文 ,现介绍初步的考虑 ,以供设计时参考     

On the geometric factors in fractured media

Abstract

In double‐porosity and multiple continuum models the fractured rock domain can be simplified as two overlapping continua, one for the matrix block system and the other for the fracture network. In this case, it is necessary to define an exchange term accounting for the transfer of fluid and solute masses between the two continua. A newly derived geometric parameter appears in the fluid exchange term, and is valid for any point‐centered block. The geometric parameter is more general and has a clear physical meaning. It is a function of both the shape and the size of the matrix block and agrees well with the double porosity model. The geometric center and conductance of the element is different under the quasi‐steady state compared to the steady state. Quasi‐steady condition is more suitable than steady state condition for modeling fractured media.     

Coherence Analysis of Boiling Water Reactor Noise

Empirical studies of coherences between measurement variables from the operating data of a commercial nuclear power station of 460 MWe are applied to derive dynamical characteristics of the Boiling Water Reactor and to attempt to identify the noise sources of the neutron flux. Multivariate techniques with the partial coherence function and the multiple coherence function are introduced to eliminate correlated effects among measurement variables due to thermal hydraulic coupling and sophisticated reactivity feedbacks. From the results, the usual coherency (the ordinary coherence function) may not be adequate to estimate linear relations between measurement variables of the BWR. Furthermore, the noise sources of the neutron flux is discussed.     

Product selection in Internet business: a fuzzy approach

In this paper, we propose a methodology which helps customers buy products through the Internet. This procedure takes into account the customer's level of desire in the product attributes, which are normally fuzzy, or in linguistically defined terms. The concept of fuzzy number will be used to measure the degree of similarities of the available products to that of the customer's requirements. The degrees of similarities so obtained over all the attributes give rise to the fuzzy probabilities and hence the fuzzy expected values of availing a product on the Internet as per the customer's requirement. Attribute‐wise the fuzzy expected values are compared with those of the available products on the Internet and the product that is closest to the customer's preference is selected as the best product. The multi‐attribute weighted average method is used here to evaluate and hence to select the best product.     

Investigating the relationship between perceived risks in communication and ICT-enabled communicative behaviors

We examine employees’ perceptions of communication problems in the workplace and their active communication behavioral responses when multiple information communication technologies (ICTs) are available for use. Through the lens of the situational theory of publics, we shed light on how employees adapt to increasing communication demands. We uncovered active technology-mediated behavior such as information gaining, action, and social interaction seeking, and their association with perceived risk (i.e., message, information and action). Findings suggest that technology-mediated communication behaviors are not only enabled by the use of ICTs but behavior also involves appropriate structuring of single and multiple ICTs to manage problems encountered during communication.     

Self-organizing method for collaboration in multi-robot system on basis of balance principle

By analyzing the operation characteristics of two subtasks that have resource dependency on each other, this paper demonstrates the impact of progress relation between the two subtasks on the whole task’s progress, and then puts forward a self-organizing principle called balance principle that keeps the individual profit between robots equal. Furthermore, an algorithm is designed for adjusting subtask selection on the basis of this principle. Simulation shows the validity of the algorithm on self-organizing task allocation in a multi-robot system. __________ Translated from Chinese Journal of Scientific Instrument, 2007, 28(2): 224–228 [译自: 仪器仪表学报]     

纺织物指别词语的翻译特色

运用简单的集合原理研究了纺织物指别词汇的语义场，发现其中的上下义关系的类属指别词和多项分类对立关系的种属指别词可以用9种不同的翻译策略加以翻译，其中的部分语义重叠特征的同义聚合关系可以构成纺织物指别词翻译的一词多译雏度，另外，归纳了9类与纺织物指别词相关的修饰性范畴词，共同构建了纺织物指别词翻译的能产性网络，用于翻译纺织物的基本指别词汇。     

Aryl acrylate porous functional polymer supports from water‐in‐oil‐in‐water multiple emulsions

Porous functional polymer supports are a class of material of wide interest due to the possibility of immobilising reactive species. A simplified procedure was applied for the preparation of porous polymer supports using a water‐in‐oil‐in‐water multiple emulsion. The primary emulsion was a high internal phase emulsion, having a volume fraction of water phase up to 95%. Two reactive acrylates, namely 4‐nitrophenyl acrylate and 2,4,6‐trichlorophenyl acrylate, were (separately) incorporated in the oil phase in order to obtain porous reactive polymer supports. Both acrylates were crosslinked with either divinylbenzene or ethylene glycol dimethacrylate, and beads of size ca 60 µm were obtained after the polymerisation of droplets suspended into the secondary aqueous phase. In the case of 4‐nitrophenyl acrylate and divinylbenzene as a crosslinker, particles with a star shape, the core being ca 60 µm in diameter and the arms ca 180 µm in length, were obtained. The polymers were functionalised with morpholine, tris(2‐aminoethyl)amine, piperidine or piperazine yielding supports with loadings of reactive groups of between 2.6 and 6.6 mmol g^?1. The results show that multiple emulsions can be precursors for porous polymer preparation. Copyright © 2007 Society of Chemical Industry