高炉渣微粉磁选铁粉品位的测定

从研究超细粉磁选铁粉品位角度出发,提出了以下方法：先将盛有磁选铁粉的坩埚放入刻有凹坑的耐火砖中,然后将其放入箱式电阻炉中加热熔化,实现渣铁分离,从而得到化学成分均匀的铁和渣,对得到的铁称重并分析其化学成分,然后进行换算,最后得到铁品位,取得了满意的效果。     

The reflexive journal: Inside the black box

It was Habermas who commented on the fact that knowledge is never interest free. But it often appears to be on the surface. Journals with their rigorous systems of double blind peer review certainly do their best to avoid partiality and add to the trustworthiness of the process. But their deeply routinised systems contribute to the “black boxing” of knowledge production. This article wishes to examine aspects of interests in knowledge. It does this by three routes of analysis. First it presents data on journal structures and process. Second it finds patterns and trends in knowledge development. Third it critically reflects on the nature of new knowledges produced. In doing so it seeks to make the workings of the black box of Annals more transparent.     

底板纵向裂缝宽度对PC等截面箱梁刚度影响分析

PC等截面箱梁桥的开裂问题越来越广泛,它影响了桥梁的结构安全和使用年限。为了掌握裂缝宽度对箱梁的刚度影响,为既有桥梁安全性能的评定和加固提供依据。为此,借以某一PC等截面箱梁桥为例,以箱梁底板裂缝开裂宽度为参数,运用Ansys模拟分析裂缝宽度变化对梁体应力和挠度的影响。本文针对一座存在底板纵向裂缝的PC等截面箱梁进行有限元分析,研究底板纵向裂缝宽度的变化对梁体刚度的影响。对了解桥梁使用现状,降低桥梁检测成本,提高加固效果有一定的参考价值。     

关于配电箱安装工程施工技术的探讨

配电箱的使用不仅方便了电网的日常管理和后期检修工作,而且提高了用户安全保障,因此,配电箱的使用越来越广泛,在安装配电箱时,我们必须遵守严格的步骤和技术要求。本文就配电箱安装工程的施工技术进行初步探讨。     

天平横向刀盒“综合”调修法

本文重点介绍了天平横向刀盒,在调修平面性、平行性、等臂性的基础上,加以"综合"性调整,使几个性能同时达到合格点,省时省力,优质高效的完成天平计量性能的调修。     

整体式减速器箱体的有限元分析

采用ANSYS对整体式减速器箱体进行了有限元模态分析。运用SolidWorks建立了箱体的几何模型并导入ANSYS软件,在网格划分时兼顾考虑了分析精度和效率,得到了较好的有限元分析模型。最后利用BlockLanczos方法计算并分析了减速器箱体的前十阶固有频率和振型。模态分析结果对产品的故障诊断和设计改进具有基础研究价值。     

“蓝箱”政策改革对农业生产和贸易的影响

利用ATPSM模型研究得出:"蓝箱"政策改革和扭曲性支持的削减能够促进中国的农业生产,减少农产品进口,刺激农产品出口,对农业生产者具有较为明显的正效应.欧盟和美国等农业高补贴国家的农业生产将大幅减少,农产品进口增加,但出口下降仅有欧盟表现突出.     

浅谈钢箱梁体外束预应力施工质量控制

目前钢箱梁已得到广泛应用,且多采用体外预应力体系,就其结构形式、工艺特点、材料规格,在城市桥梁建设中具有显著特点,体外预应力也逐渐成为预应力技术热点。本文结合工程实例,对刚箱梁体外束预应力施工作一详细介绍,与大家共同探讨。     

某箱梁施工过程中开裂事故分析

文章对某铁路桥上简支箱梁在吊装落梁过程中端头面上出现较大裂缝进行分析,发现形成裂缝的主要原因是：在落梁过程中两侧吊杆的不同步松放导致梁体的扭转和施工过程中荷载偏差系数较大。相关计算结果可供同行在进行同类设计受力分析时参考借鉴。     

The Impulse of Stock Market Volatility and the Market Crash of October 1987

This paper employs the technique of variance decomposition and impulse response functions to examine the dynamic nature of stock market volatility relationships among six major countries during the pre, around, and post October 1987 crash period. During the period around the crash, the US stock market volatility explains much better the variations of the stock market volatility of Australia, Hong Kong, Japan, Singapore and the UK. Our findings clearly indicate that the crash originated in the US and then spread to other major stock markets.