探讨汽轮机本体丝堵现场焊接工艺

为了防止汽轮机本体与丝堵结合处出现渗漏，分析汽轮机本体丝堵现场焊接工艺，包括焊接前准备、焊接过程、焊接后处理、焊接后检验。现场焊接需要确保焊接参数合理、层间温度合理。通过制备全尺寸试样检验丝堵试样焊接加工结构、焊接工艺，结合丝堵T92材料、本体P92材料，使用Φ3.2 mm镍基合金焊条、Φ5.0 mm低氢高强钢焊条交替进行氩弧焊与手工电弧焊。焊接后配合全尺寸复合载荷、无损检测对焊接效果进行测定。     

机械加工精度的计算机分析系统

提出了机械加工精度的计算机分析方法。该系统由位移传感器、放大电路、A/ D转换卡、计算机等部分组成。该系统通过位移传感器和 A/ D转换卡自动采集工件尺寸数据 ,传入计算机 ,计算机对测量数据进行处理 ,得出加工误差的分布曲线图、X-R图、合格率、废品率等信息 ,从而使误差分析更迅速、更准确 ,为在线分析提供了可能 ,达到及时调整工艺系统 ,降低废品率 ,提高生产效率的目的。     

焊接工艺评定信息化管理

随着石油化工设备技术的发展,压力容器结构及材料越来越多样,需要大量焊接工艺评定支持压力容器的焊接。将查找和判断工艺评定实现数据信息化管理,将极大提高工作效率及评定的准确性,有利于产品质量的控制和品质保证。     

基于PLC的制丝线在线防差错比对的应用

基于制丝车间加香加料工序香精料液添加和红外水分仪检测通道使用零差错的生产要求,对比传统设备控制无防差错功能,通过对加香加料控制系统和整线控制PLC进行数据交挟处理方式进行分析,提出了PLC编程处理数据简单易行模式,通过对程序的改动,实现自动防差错,满足了生产要求。通过实际生产应用,改进的基于PLC编程处理数据能实现防差错功能,具有生产控制推广性并能避免重大工艺事故发生,具有一定推广性。     

30CrMo和35CrMo的焊接工艺评定

经过多次反复试验与失败,比较分析试验结果后,找出了此前所做的焊接工艺失败的关键因素,并以此重新选择了合适的焊条、规范标准等,制定了合理的焊接工艺。在此基础上,通过分析并查阅相关资料,得出了影响焊接质量的各种因素,并最终实现了30CrMo 钢在调质状态下与X80钢的焊接以及35CrMo钢在调质状态下的对焊。经过试验,接头具有较好的机械性能,尤其是冲击韧性,满足了焊件的设计要求以及安全生产的需要。     

ERP与MRO系统集成过程建模与应用研究

为了实现产品生产阶段到服务阶段业务与数据的有效集成,从业务层和数据层对制造服务系统中的大修维护维修(MRO)与企业资源计划(ERP)的集成过程进行了建模与分析,对ERP与MRO系统之间的业务过程和信息交互过程进行了分析,建立了二者的业务集成框架模型,分析了ERP与MRO系统的数据结构转换过程,提出了二者数据集成模型。应用Web Services完成了ERP与MRO的系统集成开发,包括服务BOM集成、备品备件管理集成等。研究结果实现了制造和服务阶段关键产品数据信息的集成与反馈,打通了从制造到服务阶段的数据传递与集成,对进一步研究复杂产品生命周期管理的信息集成具有一定的借鉴意义。     

污染源工况在线监测及分析系统的设计与实现

针对目前企业治污现场环境恶劣,数据存在信息孤岛,采集的数据稳定性、准确性不佳,企业排污违法取证难的问题,对企业治污全过程监控进行深入研究,提出了一种基于ZigBee终端技术来实现对排污源头、治污过程、治污结果各工艺点数据的采集和传输,选用基于.NET的组态软件来实现对采集数据的深入挖掘和分析,并集成了远程视频取证功能,实现对排污违法的取证,最终实现以污染治理工艺为基础的集采集、传输、监测、控制、应用于一体的全过程智能监控系统。系统的实现帮助企业改进了生产工艺、提高了效率,有效地减少了资源消耗和污染排放,产生了良好的社会效益。研究方法为促进环保监测的数据化、精细化管理,提高政府监督执法效率提供了思路。     

盾安环境:高效集成SAP,实现PLM与ERP双向数据实时同步

SIPM/PLM领先的MDA技术,保证了技术系统在数据源头上符合SAP系统的要求,为全企业的数据规范打下了坚实基础,物料主信息的并发维护极大改善了SAP系统的运行效率。——盾安环境CIO赵华锋盾安环境的集团信息化采用SAP/R3为核心,实现异地多工厂、多事业部的全面管理。SAP中基础数据的维护(物料基本信息、工艺路线、BOM)均为各个工厂的设计与工艺人员,各个工厂物料的生产属性、销售属性、     

P91压力管道的焊接方法及技术研究

随着P91钢的大量使用,制定出符合该钢材特点的焊接工艺规范直接用于生产建设中,有很好的经济效益和社会效益.本文结合实例分析了P91钢焊接性,制定了P91钢的焊接工艺、热处理工艺以及在实际焊接操作过程中经常遇到的问题以及预防解决方法.     

基于一步法硅烷交联聚乙烯铝塑复合管生产工艺探究

一步法硅烷交联聚乙烯铝塑复合管生产工艺主要是指将薄壁金属管子通过高速焊接的方式以及聚合物挤出成型原理,从而实现的一种新型管材加工工艺。铝塑复合管的内外聚合物层均基于一步法硅烷交联聚乙烯反应挤出技术处理内外管,相较于其他交联工艺可以减少设备投入和大幅节省原材料成本,同时也有利于组织生产。此次就一步法硅烷交联聚乙烯铝塑复合管生产工艺进行探究,以期对相关单位有所帮助。     

Comparing FTTH access networks based on P2P and PMP fibre topologies

There is an ongoing discussion in the market which Next Generation Access (NGA) architecture best suits future needs and which investment and cost differences exist. The discussion can be subsumed as P2P vs. GPON, which is somewhat misleading as this article reveals. The discussion is driven by the fact that the high capital cost and the long asset life time of fibre mean that the technology choices made today will dominate the opportunities for telecommunication business of all market players, incumbents, competitors, content providers and business and residential users for many years in the future.The paper analyzes the cost and other differences between Fibre-to-the-Home (FTTH) access network architectures and their related different wholesale approaches by using the well-known and understood steady state approach applied in other NGA analyses in the past. In addition to the steady state analysis a dynamic cost evaluation is included taking into account the different investment behaviour of the FTTH architectures over time. The results describe investment and cost differences between architectures, incumbents and wholesale based competitive operators. The analysis has been performed for different geotypes (clusters) of decreasing population density in a representative European settlement structure.     

Indigenous peoples’ nutrition transition in a right to food perspective

In indigenous communities the nutrition transition characterized by a rapid westernization of diet and lifestyle is associated with rising prevalence of chronic disease. Field work and literature reviews from two different policy environments, Argentina (Jujuy) and Canada (Nunavut), identified factors that add to indigenous peoples’ disease risk. The analytical framework was the emerging human right to adequate food approach to policies and programmes. Indigenous peoples’ chronic disease risk tends to increase as a result of government policies that infringe on indigenous peoples’ livelihoods and territories, undermining their economic system, values and solidarity networks. Policies intended to increase food security, including food aid, may also fuel the nutrition transition. There is a need to explore further the connection between well-intended policies towards indigenous peoples and the development of chronic diseases, and to broaden the understanding of the role that different forms of discrimination play in the westernization of their lifestyles, values and food habits. Food policies that take due account of indigenous peoples’ human rights, including their right to enjoy their culture, may counteract the growth of chronic disease in these communities.     

A strategic skill based model of supplier integration and its effect on supply management performance

Supplier integration is a tool to help organizations gain competitive advantage. Strategic supply management skills and the supply management function's perceived status are hypothesized as antecedents to supplier integration leading to supply management performance. The sample for this study includes 152 executive level supply management professionals. The empirical results suggest that strategic skills and perceived status are essential antecedents to supplier integration and subsequent performance. Further, the relationship between strategic skills and performance is mediated by supplier integration. Results of a dominance analysis also suggest which strategic skills are most likely to explain status integration, and performance. These findings have significant implications for supply management theory and practice.     

Cost allocation of WCDMA and wholesale pricing for mVoIP and data services

This study estimates cost-based prices for wholesale voice and data services provided to 3G (WCDMA) MVNOs according to their distinct types. For estimation, 3G MVNOs are classified into different types, and the overall cost of WCDMA facilities are separated into voice and data components based on their subscriber rates, actual traffic rates, as well as efficiency consideration of traffic rates. The study then calculates cost-based wholesale prices of voice and data services for each of the 3G MVNO types. The result of this study shows that a cost-plus pricing scheme can help achieve the policy goals of the regulator, namely, lowering telecommunications tariffs and facilitating the introduction of new convergent-type services, far more effectively than the current retail-minus pricing scheme. The findings of this study may assist firms in developing business models based on 3G networks and telecom regulators in designing policies related to interconnection, mVoIP, prepaid calls, wholesale services, and network neutrality.     

Collectivism,individualism, and outgroup cooperation in a segmented China

A consistent theme in cross-cultural management research is that collectivists are more cooperative than individualists. We use Hofstede's measure for individualism–collectivism and combine it with an experimental measure of cooperation to test this relationship in China. In contrast to the established paradigm, we find that groups with higher individualistic scores are more cooperative than those groups with higher collectivistic scores. We attribute these results to groups being composed of outgroup members. In addition, we find that subjects from the more developed coastal area are more individualistic and cooperative than are subjects from inland China.

电子产品的电磁兼容性设计

首先介绍电磁兼容性的基本概念与研究领域,然后重点阐述电子产品的电磁兼容性设计与测量。     

SPYRO在烯烃原料生产方案测算中的应用

文章对SPYRO裂解模拟软件在石化企业烯烃生产原料优化方案测算中的应用进行了比较深度的概括分析.结合该软件在上海石化的实际应用,认为在劣质化原油加工份额不断增加的趋势下,SPYRO裂解模拟软件有助于石化企业在烯烃生产原料优化选择、生产计划合理安排、原油加工生产效益比较等方面为企业相关决策者提供有效地帮助.     

施工企业工程项目部的建设浅论

工程项目的一次性决定了工程项目部的一次性，而工程项目成本中心与企业利润中心地位又辱致工程项目部的临时性，在工程项目实践过程中，项目经理部的一次性在实现其功能的过程中可能会产生很多局限和负面影响，故项目部应具有相对的稳定性，在此基础上，本对工程项目部建设实践进行了初步总结并提出了建议。     

European consumer preferences for beef with nutrition and health claims: A multi-country investigation using discrete choice experiments

The European Union (EU) nutrition labelling policy aims to facilitate consumers’ food choice, stimulate innovation and facilitate the circulation of foods bearing claims across countries. However, the beef industry has not fully taken advantage of utilizing nutrition and health claims based on the EU nutrition labelling policy to differentiate beef products in the market. This study investigates consumer preferences for nutrition and health claims on lean beef steak. Two choice experiments were conducted among 2400 beef consumers in four EU countries (Belgium, France, the Netherlands, United and United Kingdom). Multinomial logit and error component models were estimated. Our results generally suggest that consumer valuation of nutritional and health claims varies across countries. In Belgium, the Netherlands and France, nutrition and health claims on saturated fat yielded higher utilities than claims on protein and/or iron, while the opposite was found among consumers in the UK. The results imply that marketing opportunities related to nutrition and health claims on beef are promising, but that different nutritional marketing strategies are necessary within different countries.     

Social media as a useful tool in food risk and benefit communication? A strategic orientation approach

Although considerable progress has been made in understanding the determinants of risk perception and in identifying the necessary components of effective food risk and benefit communication, this has not been matched with the development of efficient and appropriate communication tools. Little work has been done examining the implications of the explosion of new media and web technologies, which may offer potential for improving food risk and benefit communication. First, this study examines the views of stakeholders (n = 38) and experts (n = 33) in the food domain on the potential use of these emerging media for food risk/benefit communication. Based on in-depth interviews in six European countries (Belgium, Ireland, Italy, Latvia, Spain and The Netherlands), strengths, weaknesses, opportunities and threats (SWOT) of social media in food risk and benefit communication were identified. Second, a Strategic Orientation Round (SOR) was used to evaluate the relative importance of the SWOT components according to stakeholders (n = 10) and experts (n = 13). Results show that both stakeholders and experts confirm a future role of social media in food risk and benefit communication. Strengths as speed, accessibility and interaction make social media an interesting tool in crisis communication or issue awareness raising. Weaknesses as the lack of a filter, low trust, the risk of information overload and a communication preference for traditional media are acknowledged.