碗扣式钢管脚手架节点受力性能研究

针对目前市场上大量使用的碗扣式钢管脚手架,采用非国标与国标两种碗扣式脚手架节点受力性能对比试验的方法,对碗扣节点的半刚性进行了研究。得出了非国标管碗扣的壁厚较薄是造成其碗扣节点先于钢管的屈服而发生脆性断裂破坏主要原因的结论,提出了上碗扣壁厚应不小于6mm以及应加强碗扣式脚手架在生产、租售和使用中有关法规制定和监督落实的建议。     

谈加强施工现场机械设备管理的重要性

针对目前施工现场机械设备管理中安全隐患大、管理意识差、人机不符、租赁问题多等现状进行了分析,在此基础上结合自身工作经验,提出了相应的管理建议,以期指导实践。     

建设工程评标工作探析

结合实践经验,对评标专家在评标中提出的几点应注意的问题进行了总结,并给出了招投标工作的建议,从而提高评标工作效率,为投标企业的生存与发展提供机会。     

环境风险评价工作的若干要点及改进建议

通过与传统环境影响评价的对比,总结了环境风险评价的工作特点及实施方法,有针对性地探讨了目前环境风险评价工作面临的实际问题,包括源项的潜在性和不确定性、基础研究的不足以及标准体系的不完备,提出了加强信息及成果的共享、密切关注人员要素、强化后评价等改进建议。     

基于E通VPN跨域CN2备份组网设计

以中国电信股份有限公司上海分公司E通VPN平台满足用户备份组网的业务需求为出发点,通过对CN2长途MPLS VPN和E通VPN的业务现状和功能分析,确立了互联组网的设计原则,通过在用户端采用B2-1定制终端,建立IPSec隧道,经E通VPN平台以Option A方式跨域VLL接入CN2,实现了用户备份组网自动切换的技术实施要求,提供了一种可复制推广的多业务融合的行业组网解决方案。     

交互型目标规划的小组决策方法

本文在交互型目标规划方法的基础上,考虑到集体领导在决策中的作用,给出了一种程序化的小组决策方法。     

“Packaged Technology of 120 kt/a Energy-Saving Styrene Unit” and Other Three Styrene Related Projects Passed Review and Appraisal

正On December 10,2013"The packaged technology of120 kt/a energy-saving styrene unit"and other three styrene related projects jointly undertaken by the SINOPEC Shanghai Petrochemical Research Institute and other relevant institutions had passed the review and appraisal organized by the SINOPEC Science and Technology Division.Upon submittal of proposal for working out the pack-     

Oil and gas cooperation between China and Central Asia in an environment of political and resource competition

This paper investigates Central Asia＇s oil and gas resources, special geopolitics and energy competition, and approaches, challenges and prospects in cooperation between China and Central Asia. The objective is to propose measures for oil and gas cooperation between China and Central Asia. Central Asia is rich in oil and gas resources. Its remaining recoverable reserves of crude oil and natural gas account for 1.9% and 10.6 %, respectively, of the world＇s total reserves. Moreover, there is great exploration and development potential. As a strategic channel connecting Eurasia, Central Asia has a prominent geopolitical status. Many powerful countries such as the United States, Russia and China, as well as Europe, have an intense energy competition in Central Asia. In the oil and gas cooperation with Central Asia, the China National Petroleum Corporation （CNPC） focuses on establishing a coordination group, promoting overall oil and gas business opportunities and sustainable development, innovating and applying specialty engineering technology and improving project economic benefits. Through its efforts over the last nearly two decades, the China National Petroleum Corporation has completed a 50-million-tonne a year oil and gas production centre in Central Asia and oil and gas pipelines passing through multiple countries, becoming an important channel for securing China＇s energy imports. If appropriate measures are taken in the ＇Thirteenth Five-Year Plan＇ period or later, the China National Petroleum Corporation will develop a 100-million-tonne p.a. oil and gas production centre in Central Asia and a strategic oil and gas import channel exceeding this amount of production. This cooperation between China and Central Asia is however faced with the following challenges： increasing multinational competition uncertainty, potential risks in the political systems of Central Asian countries, frequently occurring violence and also resource policy tightening in Central Asia. To further oil and gas cooperation w     

正交设计法优化配煤

采用正交设计法进行配煤试验,研究各类煤的配比与焦炭强度的相关性。用正交设计法可以大大减少试验次数。根据试验得出的M40、M10、大于40mm和大于25mm粒度的数据,进行统计分析,选择出最佳配煤比为：弱黏结煤0,瘦煤25％,肥煤18％,焦粉3％,焦煤54％。     

聚酰亚胺的生产及市场

介绍了国内外聚酰亚胺的生产和市场现状,包括生产厂家,产品牌号,市场消费及产品价格等.简述了聚酰亚胺的合成方法及聚酰亚胺材料的研发趋势.并对聚酰亚胺材料的发展提出了建议.