共查询到20条相似文献，搜索用时 78 毫秒
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粉煤灰及其对水泥和混凝土性能的影响 总被引：3，自引：0，他引：3
粉煤灰是一种工业废料，但其具有良好的火山灰性和其独特的光滑球形玻璃体颗粒外形，通过做混合材和掺合料的方式，能够改善水泥及混凝土的某些性能。本全面分析了粉煤灰对水泥及混凝土性能的影响，对粉煤灰水泥的抗蚀性、耐热性、抗碳化性能等提出了更深层次的认识。 相似文献
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根据目前润滑油抗乳化性研究最新进展与国家标准,设计了创新研究型的润滑油抗乳化性能研究实验。该实验模拟实际工况条件,改变油水比,设计单次乳化以及多次连续乳化实验,除采用传统的分水率、分水速度、油水外观和界面齐整度以及乳化层厚度等抗乳化性评价指标外,还利用紫外分光光度法测定了水相含油量,利用微量水分全自动测定仪测定了油相含水量,从而对润滑油抗乳化性能进行了综合评价。此外,还可将实验内容进行拓展,通过测试油水的界面张力、界面膜强度以及乳液粒径分布和光谱稳定性来分析润滑油抗乳化性能的微观作用机制。 相似文献
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利用旋转压实仪成型试件,采用改进的Superpave设计方法进行Superflex改性沥青抗裂层混合料设计,通过浸水马歇尔试验、冻融劈裂试验、低温弯曲小梁试验、车辙试验及疲劳试验研究分析了掺加纤维前后Superflex改性沥青抗裂层混合料路用性能.试验结果表明：改进的superpave设计方法适合抗裂层沥青混合料设计;Superflex改性沥青抗裂层混合料具有良好的低温抗裂性能、水稳定性能及疲劳性能;掺加纤维可改善混合料高温性能、疲劳寿命和常温弯曲性能,疲劳寿命与应力呈指数关系,相关性较好,掺加纤维的Superflex改性沥青抗裂层适用南方湿热地区. 相似文献
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大深度锚雷是现代海战的重要武器，研究其抗扫抗猎性能能为大深度锚雷的作战使用提供理论依据。从大深度锚雷的性能特点出发并结合大深度扫雷技术和猎雷技术的发展，从作战使用的角度定性定量分析了大深度锚雷的抗扫抗猎性能。研究结果：大深度锚雷抗扫性能较差，抗猎性能比普通锚雷高。 相似文献
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在江西赣州选取20年脐橙园和10年脐橙园开展土壤抗侵蚀性能比较研究,测定其土壤抗冲性、抗蚀性、水稳性团聚体组成及特性、颗粒组成等理化性质.结果表明20年脐橙园的土壤抗冲指数、水稳性指数、平均重量直径(MWD)、几何平均直径(GMD)、有机质含量均大于10年脐橙园.说明种植时间较长的脐橙园土壤其水稳性团聚体更稳定,有机质含量更高,有助于提高土壤的抗侵蚀性能. 相似文献
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用溶液法合成阳离子高分子SCP，简略介绍了其制备方法；对SCP的性能做了一系列测定：用特性粘度法测定了SCP的分子量，其范围在30万-50万；对其水溶液的粘度、Zeta电位、电导率、表面张力以及水分散体系中阳离子高分子微粒的粒径分布进行了研究。发现这种水溶性阳离子高分子具有很好的抗盐性。 相似文献
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王正海 《淮南职业技术学院学报》2001,1(1):73-74
论述液压油在液压传动系统中的作用，在选用液压油时应考虑的主要性能(粘度，抗氧化性，抗泡沫性及良好的相容性)，对液压油的污染进行了原因分析和处理。 相似文献
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孟庆森 《邯郸职业技术学院学报》2002,15(3):62-62,66
在砖混结构设计中，为了加强建筑物的空间刚度和整体性，使建筑物在地震中避免或减轻破坏，根据抗震规范，我们设置一定数量的圈梁和构造柱，来增强和提高建筑物的抗拉、抗裂性能。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献
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正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse. 相似文献
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《今日中学生》2014,(9)
正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between 相似文献
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《重庆大学学报(英文版)》2014,(2)
正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof. 相似文献