共查询到20条相似文献,搜索用时 109 毫秒
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矿产资源是国家的重要资源,矿山设备的安全性与稳定性决定着采矿作业的效率,为此提出基于电气控制的矿山设备干式变压器结构技术性能比较研究。干式变压器结构技术性能比较主要对树脂浇注式干式变压器与浸漆式干式变压器的耐受短路性能、绝缘耐压性能、耐热阻燃性能、过载性能与耐腐蚀性能进行比较,通过比较分析发现浸漆式干式变压器结构技术性能优于树脂浇注式干式变压器,因此在采矿作业推广浸漆式干式变压器的使用。 相似文献
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介绍了本钢保险柜用BG600BC热轧高强度钢板的成分设计、冶炼和轧制工艺及产品性能。表明BG600BC热轧高强度钢板除强度大幅度提高外,同时又具有良好的延伸性能、冷弯性能、焊接性能和抗冲击性能,是保险柜用钢的首选用材。 相似文献
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《稀有金属与硬质合金》2021,(4)
采用分步浸渍法制备了V-Mo-Sb/Ti催化剂,通过XRD、XRF、N_2-吸附脱附、NH_3-TPD、H_2-TPR、UV-Vis、XPS等手段对催化剂的物化性能进行表征,通过固定床反应器考察了催化剂的脱硝性能及单质汞(Hg~0)氧化性能。结果表明,Sb的引入提高了V-Mo/Ti催化剂的比表面积、孔容、表面酸量、还原性能、化学吸附氧含量,从而提升了催化剂的脱硝性能和Hg~0氧化性能。此外,V-Mo-Sb/Ti催化剂还表现出较好的抗SO_2、H_2O性能。 相似文献
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针对白云鄂博西矿干选系统运行中存在的无法制动、料层过厚的问题,经观察研究及分析影响干选机工作效果的因素后发现,造成干选精、尾中矿石、废石相互混杂现象的主要原因是干选皮带机料层太厚,分选物料中磁性矿粒和非磁性矿粒夹杂严重。解决这个问题,目前可行的技改方案是改变干选机的给矿方式,即将干选给矿由振动给料器给到皮带上,使皮带上的物料薄而均匀,充分发挥干选系统的预选效果。 相似文献
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Previous research indicates that materialistic aspirations are negatively associated with happiness and psychological health. Recent research extends these findings by demonstrating that allocating discretionary resources toward life experiences makes people happier than allocating discretionary resources toward material possessions. Respondents to various surveys have indicated that purchases made with the intention of acquiring life experiences make them happier than purchases made with the intention of acquiring material possessions. Thinking about experiential purchases has also been shown to produce more positive feelings than thinking about material purchases. Other studies suggest that experiential purchases make people happier because they are more open to positive reinterpretations, are more resistant to disadvantageous comparisons, and foster successful social relationships more than material purchases. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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描述了烧结的三维风量分布:烧结机台车料面的二维风量分布和整个烧结机长度方向的风量分布。分析认为风量分布不合理的主要原因是粒度偏析和边缘效应、存在风箱隔板,并提出了具体的解决措施。 相似文献
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Yu. G. Bezymyannyi V. V. Skorokhod O. V. Tal’ko G. R. Fridman 《Powder Metallurgy and Metal Ceramics》2006,45(3-4):181-189
We have used mathematical modeling with experimental verification of the results to study anisotropy in the properties of
materials prepared of powdered iron. In fabrication of the powdered material, anisotropy arises in the structure as a result
of the characteristic features of the technology, which affects the options for using the material. We have experimentally
studied the degree of anisotropy in materials fabricated from powdered iron with different pressing forces. We propose mathematical
models for the macrostructure of the powdered material, and test their adequacy to experimental data. We conclude that the
degree of anisotropy in the powder material increases as it is compacted by increased pressing force. The structure of the
material at the mesoscopic level after sintering can be considered as transverse isotropic, while the properties (depending
on the degree of compaction of the material) can be described by a hexagonal or cubic symmetry system.
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Translated from Poroshkovaya Metallurgiya, Nos. 3–4(448), pp. 88–97, March–April, 2006. 相似文献
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作为材料设计基础的相图研究 总被引:4,自引:1,他引:3
介绍了现代材料设计与相图研究之间的关系,强调了计算相图的出现使相图研究成为材料的设计的一部分,相图计算程序系统的另一重要功能是评估和优化热力学参数,以双相纳米材料、宽滞后形状记忆合金、钕铁硼永磁合金、钛铝金属间化合物和低温用钢的研究开发为例,说明了相图研究在材料设计上的重要作用。 相似文献
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粉状物料的浓相输送是一种底密悬浮流。实现浓相输送,必须注意输送管径、补气量等参数。Fr准数是浓相输送的重要参数,浓相输送与粉料的溢流性、脱气性、哈斯勒比值有密切关系,粘性强、粒度太细的粉料不适于浓相输送。浓相输送系统中,单管路—分配器系统优于多管路系统,可调煤粉给料器的调节性能优于流化罐供料系统。 相似文献