共查询到20条相似文献,搜索用时 62 毫秒
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乙炔法PVC与乙烯法PVC对比 总被引:2,自引:0,他引:2
比较了乙炔法氯乙烯和乙烯法氯乙烯的合成工艺及乙炔法PVC和乙烯法PVC的生产成本、产品质量,分析了两种工艺中产生的"三废",并提出了处理措施. 相似文献
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焊缝残余应力的磁性法和盲孔法测试 总被引:1,自引:0,他引:1
对未经热处理和焊后热处理的两种16MnR平板对接焊缝应力,分别用磁性法和电测盲孔法进行了测试,得到了满意的结果。同时在磁性法计算过程中,考虑到平板对焊理论和实际情况,对σ_x进行了舍取计算。实测结果表明,磁性法中的θ_1与θ_2并不存在理论上的等值性。讨论了磁性法中灵敏系数α的确定,角θ_1与θ_2存在较大差异的原因以及盲孔法中有关系数的选用。笔者认为,磁 相似文献
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发展窑法磷酸为什么要用隧道窑法 总被引:2,自引:2,他引:2
发展窑法磷酸为什么要用隧道窑法江善襄[南京化学工业(集团)公司设计院]关于发展窑法磷酸的重要意义及窑法磷酸的起源和国内研究的新进展在1994年第3期《磷肥与复肥》范仁轩工程师的文章中已经谈到了。此文重点介绍一下我们的研究工作情况。1窑法磷酸的必要反应... 相似文献
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为了及时发现变压器的事故隐患、避免突发事故、提高变压器运行的安全可靠性,开展变压器绕组变形的监测与诊断方法的研究具有重要意义。本文介绍了通过低压短路和频率响应测量电力变压器绕组变形的基本原理和实现方法,比较了频率响应法及短路阻抗法这两种典型变形测试的灵敏性,并指出了两种方法的互补性。在初步总结诊断绕组变形基本规则的基础上,对某次变压器绕组变形故障进行了分析和诊断,进而给出了将频率响应法及短路阻抗法相结合进行绕组变形检修的方法。介绍低压短路阻抗法和频率响应法的测量原理,以及优缺点,指出阻抗法和频响法测试中存在的问题,说明阻抗法和频响法两种方法和结合测试诊断变压器绕组状况可提高诊断准确性,是一种值得推广的检测变压器绕组变形的方法。 相似文献
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将非光气法和光气法聚碳酸酯进行了微观结构分析及力学性能分析,从微观结构的不同解释宏观性能的区别,再通过与ABS共混,研究了两种聚碳酸酯在改性过程中的差异。研究发现,非光气法PC的端基为酚羟基和苯基,光气法PC的端基复杂;光气法PC的分子量分布较宽,其高分子量分子含量更多,光气法PC的简支梁缺口强度优于非光气法PC。另外,通过PC和ABS共混改性发现,非光气法PC在改性加工过程中易分解,热稳定性略差。 相似文献
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文章运用国标法、分光法和微波法同时测定国家标准样品和不同类型水样中的化学需氧量。结果表明,微波法适用于分析受污染较轻的废水,分光法虽然操作简便但有较大的局限性,受水样的影响大。在进行受污染较轻的废水分析时微波法可以作为国标法的替代方法。 相似文献
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本文通过描述增重法与减重法的测试原理,分析比较了两种方法的不同,根据称重法的发展需要分析了增重法与减重法在满足这些需要方面所表现出的优势和劣势,由此得出减重法是未来透湿性测试发展的主要方向. 相似文献
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A novel design method for a multi-component distillation system based on the quasi-binary model is presented. The quasi-binary
method, which converts the multi-component system to a quasi-binary system, could simplify the design process of multi-component
distillation. Subsequently the software integration method is introduced to the distillation design and an automatic calculation
program is developed by using Visual C++ language. The design of multi-component distillation, in which the minimum reflux
ratio R
min
or liquid-vapor ratio (L/V)
min
and the minimum numbers of stage N
min
is determined easily and quickly, is automatically performed by the technology of software integration. Three examples are
solved to demonstrate the feasibility and effectiveness of the presented method for the multi-component distillation.
Supported by the National Nature Science Fund Program of China (No. 20376078). 相似文献
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As a basis of ceramic process development, raw material selection plays a fundamental role in the final product design. For correct material selection, knowledge regarding all the properties of the raw materials should be obtained. Plasticity is one of the most important properties for molding clay products. Nevertheless, the standard methods in use, including the Pfefferkorn method, are not precise and reliable. They are based on subjective qualitative information and are dependent on technical skills. The literature shows some attempts to improve the test method, all based on the force needed to indent a clay sample surface with specific water content. Four different clays were studied and the plasticity values due to the Pfefferkorn method and the indentation test were compared. The results showed that the indentation method is reliable and more precise compared to Pfefferkorn. It is also faster and more practical. 相似文献
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根据GB/T212--2007中规定测定挥发分,通过实验对自动工业分仪法测定挥发分的结果与标准法测定挥发分的结果进行对比,结果表明,自动工业分仪法能减轻化验员的劳动强度,提高工作效率,化验结果快速而准确。 相似文献
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Foam test method 总被引:1,自引:0,他引:1
This method measures the height of foam developed by pouring. The action is intermittent, time being alloted strictly for
foam decay, as well as for foam generation. Comparative or duplicate tests can be prolonged indefinitely, or until a steadied
state is reached. Tests on solutions may be carried out at various temperatures and in the presence or absence of soils, or
foamicides, that may be added at any time. Foam heights can be measured with reasonable precision. 相似文献