共查询到19条相似文献,搜索用时 140 毫秒
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水利施工中的弃渣会对周边环境产生严重影响,其资源化利用具有重要的经济效益、生态效益和社会效益.通过室内试验的方式,探讨了水工隧洞盾构施工开挖料用于胶凝砂砾石材料的可行性,并探讨了胶凝材料用量和取代率两个主要因素的具体影响.试验结果显示,利用盾构开挖料取代一定量的天然骨料,不会对胶凝砂砾石材料的强度产生显著影响,具有一定的工程应用和推广价值,同时推荐选择45kg/m3的胶凝材料用量及60%的取代率. 相似文献
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从地质勘探的资料分析得知,伊通玄武岩是一种火成岩,其化学成分与吉林省辉南县火山渣的成分相近,且储量丰富.为了充分利用地方资源.我们与伊通水泥厂合作,利用伊通玄武岩作水泥混合材进行了大量的试验研究。试验结果表明,伊通玄武岩是一种活性火山灰质混合材,用它来生产水泥,不但能降低水泥的成本,弥补当前水泥混合材资源的不足,提高水泥的质量,而且对改善伊通的自然环境也是极为有利的. 一、玄武岩在水泥中掺加量的试验我们利用伊通水泥厂生产的硅酸盐水泥熟料、伊通玄武岩和该厂生产使用的石膏、火山渣、矿渣为组分材料,用实验室小磨(φ500×500mm)将物料磨至一定细度进行了试验。此后,伊通水泥厂在此基础上进行了生产 相似文献
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《中国房地信息》2007,(Z1):80-80
钢材木材水泥地方材料玻璃门窗陶瓷油漆防水材料类别品种及规格6.5线材12圆钢22螺纹钢25螺纹钢0.5mm镀锌薄钢板Dg40mm黑铁焊接管Dg40mm镀锌管冷轧扭钢筋φ6.5冷轧扭钢筋φ8冷轧扭钢筋φ10冷轧扭钢筋φ12落叶松锯材(3.5-5m,1-3级)红松锯材(3.5-5m,1-3级)白松锯材(3.5-5m,1-3级)杉木锯材(3-5m,1-3级)三层普通胶合板五层普通胶合板普通硅酸盐水泥42.5(散装)普通硅酸盐水泥42.5(袋装)普通硅酸盐水泥32.5(散装)普通硅酸盐水泥32.5(袋装)泵送商品混凝土C30泵送商品混凝土C50泵送商品混凝土C60普通粘土红砖粗砂中砂承重多孔砖KP1240×115×90承… 相似文献
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粉煤灰在印染废水处理中的应用研究 总被引:3,自引:0,他引:3
粉煤灰的特殊结构决定了其良好的吸附性能,因而对印染废水有较好的处理效果。对粉煤灰进行物理化学改性,研究高效复合粉煤灰混凝剂,将粉煤灰与其他物质组合处理印染废水,并解决饱和灰的最终处置问题,是提高粉煤灰利用价值的有效途径。 相似文献
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针对某市钢筋混凝土地下综合管廊的现浇顶板、侧壁出现的混凝土爆灰质量缺陷,为确保管廊结构的安全使用,采用钻心法、超声波法、沸煮试验、爆灰物质的化学成分分析等检测方法,对爆灰现象进行了检测。结果显示,混凝土中存在的块状氧化钙与水熟化后体积增大1倍~2.5倍,使得混凝土在强度未达到设计抗拉强度前在块状氧化钙体积膨胀应力作用下被拉裂,导致了此类质量缺陷的发生。分析了质量缺陷对管廊结构的影响,并对管廊结构进行了加固设计及处理,满足了结构的正常安全使用要求。研究结果可为类似爆灰缺陷的设计及处理提供参考。 相似文献
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90年代以来,世界石化市场重心偏移亚洲,中国石化工业面临着激烈的币场竞争,根据2000年我国石化工业市场占有率的目标提出了市场、产销一体化、规模、产业布局、相关产业和体制改革等产业结构调整中的问题和相应实施的措施。 相似文献
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Louis P Bucklin 《Food Policy》1977,2(2):114-122
The adoption of horizontal and vertical integration in retail systems in the marketing of food in developing countries has long been the recommendation of researchers in this field. The author suggests that such proposals may not achieve the desired results for the poorer consumers in low-income Asian countries. An alternative approach, based upon the strengthening and improvement of traditional methods, is suggested as a more appropriate course of action in those countries. 相似文献
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Mike Bendixen Author Vitae Author Vitae Russell Abratt Author Vitae 《Industrial Marketing Management》2004,33(5):371-380
Brands have been developed by consumer companies but have been slow to develop in business-to-business marketing. This article explains the concept of brand equity in a specific industrial marketing setting. In addition, the sources of brand equity are investigated as well as the appropriate communications strategy and the relative importance of brand relative to other purchase criteria. The research method used was a conjoint analysis experiment. The subjects were decision-making unit (DMU) members of industrial companies in South Africa that purchase medium-voltage electrical equipment. Research results suggest that while brand equity has a role to play, price and delivery were more important. However, a price premium can be obtained when a company has high brand equity. Implications for managers are discussed. 相似文献
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J. H. Scholefield 《R&D Management》1994,24(1):091-097
Abstract
The allocation of R&D resource in a multi-business organisation is often based more on current operating performance than on the relative potential for technological development of the businesses. The approach suggested in this paper attempts to overcome these problems by linking R&D allocation very closely to business strategy. The two key concepts are technology leverage, i.e. the extent to which technology can change the business environment in an industry to yield competitive advantage, and business leverage i.e. the current competitive strength of an individual business within an industry. Where technology leverage is weak, competitive advantage will be mainly dependent on factors other than R&D and it is suggested that levels of R&D effort at or below 1 % of turnover are appropriate. Where technology leverage is strong, R&D can be effective in maintaining strong business leverage by achieving technology mastery or in transforming a weak business position by creating a technological discontinuity. R&D intensities ranging from 3 to 15 or more % of turnover are thought to be appropriate in these cases. This framework can be used for policy debates on R&D allocation, for example whether the R&D allocation is appropriate for the business strategy or whether R&D could spearhead a more expansionist business strategy. The framework has been successfully used in ICI Chemicals and Polymers Limited during the annual R&D budget process. 相似文献
The allocation of R&D resource in a multi-business organisation is often based more on current operating performance than on the relative potential for technological development of the businesses. The approach suggested in this paper attempts to overcome these problems by linking R&D allocation very closely to business strategy. The two key concepts are technology leverage, i.e. the extent to which technology can change the business environment in an industry to yield competitive advantage, and business leverage i.e. the current competitive strength of an individual business within an industry. Where technology leverage is weak, competitive advantage will be mainly dependent on factors other than R&D and it is suggested that levels of R&D effort at or below 1 % of turnover are appropriate. Where technology leverage is strong, R&D can be effective in maintaining strong business leverage by achieving technology mastery or in transforming a weak business position by creating a technological discontinuity. R&D intensities ranging from 3 to 15 or more % of turnover are thought to be appropriate in these cases. This framework can be used for policy debates on R&D allocation, for example whether the R&D allocation is appropriate for the business strategy or whether R&D could spearhead a more expansionist business strategy. The framework has been successfully used in ICI Chemicals and Polymers Limited during the annual R&D budget process. 相似文献