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某医院住院楼建筑总面积22 278m2,框剪16层,地下一层,人工挖孔灌注桩,混凝土筏板厚1.0m,共需混凝土2 400m3.为了确保浇筑质量,我们根据高层建筑大体积混凝土浇筑要求,采取了一系列技术措施,成功地组织并完成了筏板的施工任务.…… 相似文献
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立窑窑壁保温措施较多,一般需根据具体情况来制定方案。我们对22台机立窑的筒体保温情况进行了测试和跟踪调查,认为采用复合保温方案,效果也较好。1复合保温方案及材料在保温前先对筒体外部进行了温度测试,根据筒体散热大小,也就是筒体与环境温差大小,采取不同的保温方案。再就是窑体各部温差要相对稳定,如果局部发现温差过高(超过100℃)有可能筒体内部无隔热层,或耐火砖损坏严重,必须修复后再保温。凡是要保温的立窑,温差不得超过50℃,且耐火砖与筒体之间必须有一定厚度的保温层,至少要3~4cm硅酸铝耐火纤维毡1~… 相似文献
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平安大厦位于大连市中山区繁华的人民路 2 0号 ,西侧为安乐街 ,北侧为万里巷 ,东侧毗临鑫港大厦 ,是一座集商业、金融、办公为一体的现代化综合楼。总建筑面积 33690 m2 ,楼层共 31层 ,其中地下 3层 ,地上 2 8层 ,总高度为 114.1m,结构设计形式框架剪力墙 ,基础底板为阶梯式筏板基础 ,板厚分别为12 0 0 mm和 2 30 0 mm,消防电梯局部板厚达 52 0 0 mm。底板混凝土设计标号为 C30 S8,施工季节为冬季。从以上特点看 ,平安大厦底板混凝土工程属于大体积混凝土工程。1 施工方案的确定大体积混凝土施工关键在于混凝土温度裂缝的控制。因此延缓水… 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
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以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献