大直径PHC管桩预制厂平面设计及生产工艺

本文介绍了生产PHC管桩生产厂的工艺、工艺设计及生产工艺要求,论述了通过工艺优化以达到较佳的工艺布置,同时通过各类工艺参数设计的对比优选出适合PHC管桩的合理控制工艺。     

发电厂对烟气二氧化硫控制技术探讨

针对发电厂对烟气二氧化硫控制技术探讨问题,对目前燃煤过程的主要脱硫工艺进行了介绍,探讨了石灰石/石膏湿法的脱硫工艺、烟气循环流化床脱硫工艺、新型一体化干法脱硫工艺和氨法脱硫工艺,通过对发电厂现行两种脱硫工艺效果的探讨,循环干法烟气脱硫技术和CFB脱硫工艺,对两种不同脱硫工艺系统进行了比较。为发电厂脱硫技术选择和创新提供了依据。     

基于C3P的工艺设计模式的创新

分析了C3P环境下工艺人员角色的转换,建议工艺人员在概念设计阶段就介入产品设计,及时对设计进行评估;分析了3D环境下工艺设计的输入与输出,并建议以PDM中的数据作为工艺设计的唯一数据源;介绍了Solid Works环境下机加工工艺、钣金工艺、焊接件工艺的颠覆式创新,介绍了基于图解和动画的装配工艺设计及车间看图系统。     

电子装配工艺规程的编制

工艺文件是产品生产重要的技术文件之一,本文从企业生产一线工艺的角度论述了工艺文件的两大组成部分、电子产品工艺文件的成套性编制和工艺文件的管理,着重讲述了指导技术操作的工艺文件———工艺规程的编制。     

1000MW压力容器壳焊接质量控制

文章针对1000MW反应堆压力容器的制造,介绍了RPV的技术参数、结构特征、关键工艺。讨论说明了RPV的焊接要求和焊接工艺特点,并就筒体窄间隙埋弧自动焊工艺、筒体内壁不锈钢堆焊工艺、接管与安全端异种金属焊接工艺、CRDM管座J坡口角焊工艺等重要接头的焊接工艺进行了讨论,同时从设备监造角度对焊接制造工艺进行了探讨。     

基于Teamcenter的标准件系列产品工艺设计研究及应用

结合公司在Teamcenter系统设计、工艺一体化平台上工艺设计实施情况,以实际型号标准件系列产品工艺设计为背景,对实施和应用细节进行详细的分析和研究,阐述了设计工艺一体化平台针对标准件系列工艺规程设计的软件功能和实施过程中的关键技术,提出了在企业技术工艺数据源头平台建设实施过程中应注意的问题,通过平台功能的实施,为企业后续实现标准件产品全生命周期数字化管理打下坚实基础,提升标准件系列化工艺设计效率,同时满足全要素工艺数据结构化,在软件功能上融入工艺标准化管理模式,在提升工艺设计效率的同时兼顾了工艺规范性和统一性。     

浅析氨吸收制冷工艺与压缩制冷工艺的比较

介绍了氨吸收制冷工艺和压缩制冷工艺,并进行了两种工艺的比较,大型煤气化和液化生产企业采用氨吸收制冷工艺,既回收了余热,又节省了电能,具有很好的经济效益。     

自动连续砂过滤工艺在水处理中的应用

介绍了自动连续砂过滤工艺,并与常规水处理工艺进行比较,具有明显优于常规水处理工艺的特点。自动连续砂过滤工艺在饮用水处理、工业工艺用水处理、市政污水深度处理和工业污水处理中应用的工程实例,进一步验证了这种工艺的成熟可靠性,值得在国内推广。     

风机盘管冷凝水盘加工工艺研究

本文对风机盘管冷凝水盘的加工工艺方案进行了系统研究,创新地提出了包括盘体钣金件分步拉伸工艺方案、海绵滚压成型工艺方案、海绵电热切割工艺方案等一整套加工工艺方案。工艺方案经实践证明切实可靠,研究结果对冷凝水盘的生产具有重要的实际指导意义。     

1FT5交流伺服电机装配尺寸链的建立

在充分消化吸收西门子公司交流伺服电机制造工艺技术的基础上,通过对影响伺服电机电气性能指标的零部件的装配工艺分析,建立了伺服电机的工艺尺寸链,制订了关键部件的加工工艺,实测结果表明所采取的工艺措施达到了预期的效果.     

ASD S1000D规范中的数据模块编码分析

数据模块编码是按ASD S1000D规范创作的数据模块的标准化标识,包含在数据模块的标识与状态部分中,是数据模块唯一标识的一部分,用来管理通用数据库中的数据模块,以实现电子环境中对数据模块的查询和访问。数据模块编码由17到37位字符组成,分为型号识别码、系统区分码、标准编码系统、分解码／分解码变体、信息码／信息码变体、零件位置码六大部分。S1000D中的数据模块编码具有较强的适用性,将其作适当的调整,即可较好地应用于我国的武器装备系统中。     

A direct Monte Carlo approach for Bayesian analysis of the seemingly unrelated regression model

Computationally efficient methods for Bayesian analysis of seemingly unrelated regression (SUR) models are described and applied that involve the use of a direct Monte Carlo (DMC) approach to calculate Bayesian estimation and prediction results using diffuse or informative priors. This DMC approach is employed to compute Bayesian marginal posterior densities, moments, intervals and other quantities, using data simulated from known models and also using data from an empirical example involving firms’ sales. The results obtained by the DMC approach are compared to those yielded by the use of a Markov Chain Monte Carlo (MCMC) approach. It is concluded from these comparisons that the DMC approach is worthwhile and applicable to many SUR and other problems.     

基于DMC-Ⅱ数码航空摄影测量区域网布设研究

从航空摄影到基础地理信息数据产品的获取包括航空摄影、地面控制、空三加密、内业测图等几个阶段。相片控制测量是航空摄影测量的基础工作,通过空三加密获得内业测图所需的外方位元素数据。随着DMC等数字航摄仪应用到航测生产领域当中,DMC影像数据在全数字摄影测量中发挥了越来越重要的作用。本文利用DMC-II数码航空影像,通过实验对DMC-II数字航摄资料的在西南控制困难地区外业像控的布点方案、基线数量、点位位置采取不同方案进行内业加密问题进行研究、分析,总结区域网布点方案的规律性。     

汶川地震震源辐射能量持续时间的快速估计

研究中,我们从IRIS DMC搜集了震中距范围在30°-95°的欧洲台阵87个台站所记录的远震P波垂直分量,采用了IRIS提供的震源参数,首先利用IASPEI91速度模型以及几何射线方法计算出震源在震中位置时的理论走时(P波初至)进行时差校正,然后截取了P波初至前5秒和后15秒的波形记录,利用波形互相关计算出"互相关时差"并将其校正。     

Slumdog cities: rethinking subaltern urbanism

This article is an intervention in the epistemologies and methodologies of urban studies. It seeks to understand and transform the ways in which the cities of the global South are studied and represented in urban research, and to some extent in popular discourse. As such, the article is primarily concerned with a formation of ideas - "subaltern urbanism" - which undertakes the theorization of the megacity and its subaltern spaces and subaltern classes. Of these, the ubiquitous ‘slum’ is the most prominent. Writing against apocalyptic and dystopian narratives of the slum, subaltern urbanism provides accounts of the slum as a terrain of habitation, livelihood, self-organization and politics. This is a vital and even radical challenge to dominant narratives of the megacity. However, this article is concerned with the limits of and alternatives to subaltern urbanism. It thus highlights emergent analytical strategies, utilizing theoretical categories that transcend the familiar metonyms of underdevelopment such as the megacity, the slum, mass politics and the habitus of the dispossessed. Instead, four categories are discussed — peripheries, urban informality, zones of exception and gray spaces. Informed by the urbanism of the global South, these categories break with ontological and topological understandings of subaltern subjects and subaltern spaces.     

计算机信息化管理在食品药品检验领域中的应用

信息化是当今世界发展的大趋势,是推动经济社会变革的重要力量。大力推进信息化,是覆盖我国现代化建设全局的战略举措,计算机信息化管理在食品药品检验领域的应用,是构建社会主义和谐社会的迫切需要和必然选择。利用信息化加强食品药品监管工作力度,做到监督到位,处理措施得当,避免安全事故的发生。信息化应用与科学检验相辅相成,为人民群众生命安全负责,为社会安定、和谐发展保驾护航。本文对计算机信息化管理在食品药品检验领域中的应用进行一个分析阐述。     

旋转式压缩机定子变形分析

旋转式压缩机定子与壳体之间采用过盈配合的固定方式,其过盈量的选择直接影响到定子变形量。本文介绍了运用CAE仿真软件模拟分析定子和壳体之间的高度非线性接触的复杂问题,通过该模拟分析方法得到定子与壳体在不同过盈量下的变形情况,且分析结果得到了实验支持,为后续的定子结构设计和优化及过盈量的选择提供了理论参考依据和模拟分析方法。     

Input/output ranges and performance: an examination of US machine tool producers

Despite the establishment of high-tech multinational enterprises (MNEs) in Ireland since the late 1950s, the country did not succeed in closing the technological gap with most of its EU counterparts. The weak National System of Innovation (NSI), and in particular low business and government R&D levels, combined with a lack of research and technology linkages between MNEs and indigenous firms, explain these poor results. However, the Shannon region in the West of the country presents some specific institutional characteristics that could theoretically make the region a strong technological enclave. The various actors in the region - i.e. the administrative, financial, political and research institutions, as well as the business organizations - have indeed infused a new type of economic development. After a brief review of the available concepts and models articulated around these actors and their interrelationships, the paper analyses whether the Shannon region, taken as an illustrative example, mirrors a specific economic and technological localized setting. The study is based on a survey of indigenous and foreign firms.     

Analysis of high dimensional multivariate stochastic volatility models

This paper is concerned with the Bayesian estimation and comparison of flexible, high dimensional multivariate time series models with time varying correlations. The model proposed and considered here combines features of the classical factor model with that of the heavy tailed univariate stochastic volatility model. A unified analysis of the model, and its special cases, is developed that encompasses estimation, filtering and model choice. The centerpieces of the estimation algorithm (which relies on MCMC methods) are: (1) a reduced blocking scheme for sampling the free elements of the loading matrix and the factors and (2) a special method for sampling the parameters of the univariate SV process. The resulting algorithm is scalable in terms of series and factors and simulation-efficient. Methods for estimating the log-likelihood function and the filtered values of the time-varying volatilities and correlations are also provided. The performance and effectiveness of the inferential methods are extensively tested using simulated data where models up to 50 dimensions and 688 parameters are fit and studied. The performance of our model, in relation to various multivariate GARCH models, is also evaluated using a real data set of weekly returns on a set of 10 international stock indices. We consider the performance along two dimensions: the ability to correctly estimate the conditional covariance matrix of future returns and the unconditional and conditional coverage of the 5% and 1% value-at-risk (VaR) measures of four pre-defined portfolios.     

科技是绿色建筑发展的基础

近年来,全球气候恶化,温室气体效应危害了全人类的生存环境。随着我国城市化进程的加速,相应的建筑物和设施将大幅增加,建筑能耗随之加大。一种能节约能源及资源、减轻环境负荷的绿色建筑应运而生,成为我国建设小康社会的必由之路。文章认为,日新月异的科技进步必然是绿色建筑发展的坚实基础和唯一途径。