铁素体区轧制技术及应用于攀钢生产的可行性

讨论了铁素体区轧制技术的优势,特点及其在国内外生产厂家的应用现状,分析限铁素体区轧制工艺在攀钢实施的可行性。     

Nitrogen utilization and transformation in red soil fertilized with urea and ryegrass

The influence of fertilization with urea and ryegrass on nitrogen utilization and transformation in red soil has been studied by using ^15N tracer method.When urea and ryegrass were applied alone or in combination,the percentage of N uptaken by ryegrass from labelled urea was 3 and 1.7 times that from labelled ryegrass for the application rate of 200mgN.kg^-1 and 100mgN.kg^-1,respectively;combining application of ryegrass and ureareduced uptake of urea N and increased uptake of ryegrass N by ryegrass plant,but the percentage of N residued in soil increased for urea and decreased for ryegrass.when urea and ryegrass were applied alone,the percentage of N residued in soil from labelled ryegrass was more than 69% while that from labelled urea was less than 25%,and much more ryegrass N was incorporated into humus than urea N.     

A ctivation measurement of neutron distribution in intermediate energy heavy ion target area

The distribution of neutrons produced by the reaction of 50MeV/u ^12C-ion on a thick Cu target are studied.The neutrons are measured with threshold activation detectors.Al.F,C,Al and In activation samples were used to measure neutrons with energy greater than 7,11,20,50MeV and thermal neutrons,respectively,The fluence rate,energy and angular distributions of neutrons,total neutron yield of 12C-ion and the emission rate in the forward direction of neutrons over 11 and 20MeV were obtained.     

分子介质中的正子素形成几率与辐射保护效应

从辐射化学的观点出发,引入辐射保护函数(F)的概念,根据云团反应的竞争机理,建立了“理想二元体系”中正子素形成几率和保护函数之间的关系式;并且,根据此关系,对正庚烷——正穴清除剂(二噁烷,三乙胺,吡咯烷)体系的I_3值及对一些阴离子(I~-,Br~-,Cl~-,S~(2-),SCN~-和F~-)水溶液中的I_3值随溶质浓度的变化进行了定量地拟合。发现,在正穴清除剂体系中,吡咯烷与其他两者相比,对正庚烷具有较大的辐射保护效应;而对阴离子水溶液体系,阴离子对水的辐射保护效应从大到小的顺序是:I~-,SCN~-,S~(2-),Br~-,Cl~-,F~-。实际上,F~-对水毫无保护作用。     

粮库远程监管系统的设计与开发

本文介绍的粮库远程监管系统基于Java EE平台,采用Web Service技术,能够采集数字粮库系统的业务数据,传输并保存到系统数据库中,具有查询地理地图、个性化首页、统计分析、粮情监测分析、业务单据索引以及视频监控等功能,能够对粮食收购、销售、保管等业务的全过程进行监管。     

Analyzing the problem of unsustainable health information systems in less-developed economies: Case studies from Tanzania and Mozambique

Most of donor-supported information technology (IT)–based projects developed or implemented in less-developed economies (LDEs) end up as complete or partial failures or unsustainable. Notably, a number of intra-organizational and external factors are associated with this problem, including inadequate infrastructure and human resource capacity, fragmented donor policy, and lack of policies to manage the sustainability problem. Accordingly, IT initiatives are often donor-driven, top-down, and hijacked by top managers who (normally) do not have adequate skills, but have enormous power to enforce such initiatives across organizational hierarchies.

In analyzing the concepts from sustainability and institutionalization, key insights towards a better understanding of the problem of unsustainability are developed. It is argued that health information systems (HISs) become sustainable if they are institutionalized in the sense of being integrated into the everyday routine of the user organization. However, a sustainable HIS should also be flexible enough to allow changes as the user needs change. Moreover, introduction of a new HIS is not only a technical change, but requires the cultivation and institutionalization of a new kind of culture.

Through a comparative case analysis of the HIS development and implementation processes in Tanzania and Mozambique, we have identified two sets of relationships, between the Ministry of Health (MoH) and donor agencies and between the MoH and software development agencies as critical and contributing factors to the unsustainability of a HIS. Given this setting, we highlight three key strategies for dealing with the problem of unsustainability in LDEs: (a) integration of a HIS, (b) local shaping of new cultures, and (c) cultivation approach to systems development. © 2005 Wiley Periodicals, Inc.     

计算机专业电路课程教学改革与实践

本文针对计算机专业电路课程教学工作中存在的问题,从课程体系、课程内容的调整与选择,教学方法、课程考核方法的改革等方面提出了若干改进措施和建议。     

情境互动 户外广告新趋势

情景互动式创意手法目前风行于海外户外广告之中,在国内也逐步受到重视。文章通过对情境性、互动性的分析,指出情景互动式广告创意以其巧妙的构思和精湛的表现手法大大弥补了户外平面广告媒体的先天缺陷。并借由对典型设计实例的分析分类,论证了情景互动式创意在户外广告中运用的有效方法。     

Characterization of fuzzy clustering algorithms in terms of entropy of probabilistic sets

We discuss a method of evaluating fuzzy clustering algorithms. Each of them generates a partition matrix of a data set with the entries lying in the [0, 1] interval and expressing the grade of belonging of the object to the clusters detected. Membership functions of the same cluster are interpreted as probabilistic sets in the sense of Hirota. This makes it possible to characterize the clusters by means of the entropy of the corresponding probabilistic sets. Moreover, the mutual entropy of pairs of probabilistic sets provides an index for evaluating the degree of interaction between clusters.     

施威德勒型单层球面网壳结构抗火的非线性有限元分析

根据ISO-834标准升温曲线与结构钢强度和刚度随温度的变化曲线,采用非线性有限元法对不同的矢跨比的施威德勒型单层球面网壳结构进行了抗火分析,得到了一些结果,可为经济、科学的结构综合防火设计提供理论依据.