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用X射线粉末衍射仪、X射线能谱仪和等离子体原子发射光谱仪分析了多种矿物基材料的主物相结构和元素组成,并用离子检测仪测定了各材料的负离子发生量.研究表明,具有负离子发生功能的矿物基材料可以由具有明显压电、热电效应的矿物组成,也可以由含有一定量稀土元素和天然原生放射性核素的矿物组成.矿物中适量天然原生放射性核素的存在对于制备高性能的矿物基负离子发生材料是有益的. 相似文献
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利用"矿物掺合料在提高混凝土性能的应用"课题的研究成果,在施工实践中进行了大面积地推广应用,取得了显著的经济和社会效益。矿物掺合料的应用、制备已牵涉到水泥基材料科学研究的各个方面。在现代混凝土技术中,经过一定质量控制的矿物掺合料已成为高性能混凝土不可或缺的组分之一。本文通过对矿物掺合料研究历史和研究现状的分析,探讨了当前研究的主要缺陷及存在的问题,并展望了下一步的研究方向。 相似文献
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随着我国经济建设的蓬勃发展 ,高层的、高质量的建筑物日益增多 ,这对主要建筑材料———混凝土提出更高的要求。高性能混凝土正是这种社会需求的产物。所谓高性能混凝土是指混凝土具有高强度、高耐久性、易施工和良好的体积稳定性。混凝土要达到高性能的主要技术手段是采用极少量的高效减水剂和适量的微粉非金属矿物作为掺合料 (包括微粉高炉渣、矾渣、锂渣和磷渣 )。采用高效减水剂能降低水灰比 ,增加塌落度 ,赋予混凝土高的密实度和流动性 ,从而提高混凝土的抗压强度和施工性能。而微粉非金属矿物能填充水泥颗粒之间的空隙 ,并参与水泥的… 相似文献
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为促进拜耳法赤泥在胶凝材料中的大宗化和高附加值利用,以山西孝义拜耳法低铁赤泥为研究对象,借助XRD、FTIR、SEM、ICP-OES等现代测试手段,研究了拜耳法赤泥在电石渣-脱硫石膏体系中的水化硬化特性。研究表明,拜耳法低铁赤泥具有潜在活性,氧化铝为其活性的最主要来源,在电石渣-脱硫石膏体系中,通过电石渣的补钙作用和脱硫石膏的促进激发作用,赤泥中的氧化铝得以有效激发,其水化产物主要为钙矾石、C-S-H凝胶、水化硫铁酸钙、钙霞石、无水芒硝和氢氧化铝。 相似文献
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研究了膨润土插层聚合制备吸水材料的过程中各因素对膨润土-有机复合高性能吸水材料吸水性能的影响,探索低成本、工艺简单的方法制备出高性能吸水材料,通过XRD、SEM对材料进行了表征,该高性能吸水材料的推广将使有助于新疆优势矿产资源得以利用,可以推动当地的经济发展。 相似文献
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A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils. 相似文献
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Standards are the basis for production enterprises to organize production ex-factory inspection trade 《中国标准化(英文版)》2008,25(1):24-25
Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.…… 相似文献
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Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß. 相似文献
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The end of over unit products of more than Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits beer wine yellow wine fruit syrup wine others cover over % of the national top-branded liquor products.…… 《中国标准化(英文版)》2008,25(1):30
The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.…… 相似文献
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Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster. 相似文献
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N.A. Odintsova N.V. Ageenko K.V. Kiselev N.M. Sanina E.Y. Kostetsky 《International Journal of Refrigeration》2006,29(3):387
We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes. 相似文献
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David R. Smith F. R. Fickett 《Journal of research of the National Institute of Standards and Technology》1995,100(2):119-171
Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability. 相似文献
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Fco. Javier Franco Pérez Marc Gener Moret 《Materials and Manufacturing Processes》2017,32(7-8):876-884
ABSTRACTThe production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials. 相似文献
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《中国标准化(英文版)》2014,(4)
正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from 相似文献
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《中国标准化(英文版)》2014,(5)
正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively. 相似文献