石油化工静设备计算机辅助设计系统VCAD2.0扩充版介绍

石油化工静设备计算机辅助设计系统ＶＣＡＤ２．０扩充版介绍中国石化总公司ＶＣＡＤ联合开发组ＴＨＥＲＥＣＯＭＭＥＮＤＡＴＩＯＮＯＦＰＥＴＲＯＣＨＥＭＩＣＡＬＶＥＳＳＥＬＣＯＭＰＵＴＥＲＡＵＸＩＬＩＡＲＹＤＥＳＩＧＮＳＹＳＴＥＭＶＣＡＤ２．０ＥＮＬＡＲＧＥ...     

葡萄及葡萄酒中的有机酸及降酸研究

为了探索降低葡萄酒中过量有机酸的有效方法,综述了葡萄和葡萄酒中有机酸的形成及变化,较系统地论述了国内外葡萄酒降酸研究的进展,着重介绍了本研究室以粟酒裂殖酵母与葡萄酒酵母为亲株,采用原生质体融合技术进行生物降酸的研究。     

Design and Performance of a 46-m-High MSE Wall

This paper focuses on the design and performance of a very tall mechanically stabilized earth (MSE) wall. Expansion of Seattle-Tacoma International Airport called for the construction of a third runway west of the two existing runways. A significant volume of compacted earth fill was required to raise the grade as much as 50 m to meet the level of the existing airfield. Nominal 2H:1V fill slopes were used where possible, but MSE retaining walls were used where fill slopes would have encroached into existing wetlands. Consequently a four-tier 46-m-tall MSE wall was constructed along a portion of the western edge of the embankment. Performance monitoring included strain gauge-instrumented reinforcing strips, inclinometer installations with sondex settlement rings, optical survey of the wall facing for vertical and lateral movements, and piezometers. This paper describes wall design issues, aspects associated with the instrumentation of the wall, and the observed performance. Monitoring indicates satisfactory performance of the MSE wall and compares reasonably well with predicted performance.     

构建生态城市——保护我们的生存环境

早在20世纪70年代,联合国教科文组织发起了人与生物圈计划研究,提出了生态城市的概念.所谓生态城市,是根据生态学原理综合研究城市生态系统中人与住所的关系,并应用科学与技术手段,协调现代城市经济系统与生物的关系,保护与合理利用一切自然资源与能源,提高人类对城市生态系统的自我调节、修复、维持和发展的能力,使人、自然、环境融为一体,互惠共生.     

冷轧薄宽带钢局部型中浪瓢曲变形行为研究

针对薄宽带钢冷轧过程中易发多发的局部型中浪瓢曲缺陷,引入非均匀载荷宽度、弹性约束系数及平均张应力建立了屈曲变形的解析计算模型。应用能量最低原理对屈曲变形区域进行搜索求解,得到了局部型中浪屈曲临界条件(包括临界应力、屈曲波长和屈曲波宽),获得了其与非均匀载荷宽度、弹性约束系数、平均张应力的关系,并发现平均张应力是产生局部型中浪的重要影响因素。应用样条有限元方法对局部型中浪进行数值仿真分析,验证了屈曲解析计算方法的正确性。在实验轧机上进行了轧制研究,通过轧制获得了局部型中浪屈曲模态,对实验结果分析得到了相对应的屈曲临界条件,与解析法和样条有限元法结果基本吻合,证明了样条有限元计算方法与解析计算方法的正确性及其工程应用价值。     

0412-1961

用ZrO_2固体电解质组成氧浓差电池:(-)Re,In,In_2O_3     

严格按照中央要求继续推进节能减排工作——对吴江市印染行业近几年节能减排工作的调查

吴江市印染行业是耗能、排污大户,在当前创建资源节约型、环境友好型社会的热潮中首当其冲。吴江市丝绸协会曾于2003年6月对该行业的节能减排工作做过调研,近几年在这方面有哪些建树?根据中央对节能减排的更高要求,下一步棋应该怎么走?这是摆在大家面前的重要课题。为此,协会近期又作了调研。     

ELECTRICALLY FUSED FORSTERITE-OLIVINE,I-II*

North Carolina olivine was melted in the electric arc-resistance furnace, with simultaneous reduction of the iron (fayalite) components, to form a product consisting essentially of crystalline forsterite. The forsterite obtained from olivine by reduction was contaminated by clinoenstatite or a siliceous glass unless MgO or CaO was added to the charge. Silica, present in excess of orthosilicate proportions, was not eliminated by carbon reduction. Simultaneous reduction or vaporization of MgO prevented increase in the MgO to SiO₂ ratio by carbon reaction. Addition of theoretical amounts of MgO to the melt to produce forsterite completely eliminated the clinoenstatite and siliceous glass and resulted in an abrupt increase in high-temperature load-bearing strength. The presence of lime was detrimental to high-temperature load-bearing strength.     

光伏十二五目标确定庞大市场待开启电源生产王国转战新能源

1引言过去十年是世界光伏快速成长的十年,中国光伏产业也快速崛起。国家非常重视这一新兴战略性产业的发展,出台的十二五能源规划中提到要大力发展光伏应用。作为亚洲规模最大的电源生产王国,