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从流变学方面解释了漆膜流挂产生的原因,并提出了解决漆膜流挂的一些方法。对于漆膜橘皮,分析了橘皮产生的机理,提出了改进漆膜橘皮缺陷的方法;对于漆膜气孔和针孔缺陷,建立了气孔和针孔产生的理论模型,针对每种模型,分析了其产生原因,并提出了改进方法;对于漆膜失光,也提出了一些预防措施。 相似文献
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《煤炭加工与综合利用》2019,(11)
介绍了干法选煤技术在河南能源贵州公司的应用推广和实施效果,比较了干法分选效果,指出了存在的问题,提出了改进措施;根据公司发展情况提出了下一步优化方案与规划设想,并对复合式干选工艺的推广应用提出了建议。 相似文献
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基于在合成2-氯丙烯基异硫氰酸酯过程中的气相色谱检测数据,提出了该重排反应的机理,并以热力学公式计算出了该反应的标准吉布斯自由能,提出了如何获取更高2-氯丙烯基异硫氰酸酯收率的实验优化方向;以实验验证了提出的重排反应机理,提出了气相色谱在跟踪反应进程时的最优化方法。 相似文献
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本文主要针对煤矿通风安全事故发生的因素和预防措施展开研究,首先进行了矿井通风系统环境分析,基于此提出了煤矿通风安全的影响因素,其中包括环境和人文两种因素,其次提出了煤矿通风安全事故发生的因素,最后提出了煤矿通风安全的保障措施。 相似文献
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本文根据建构主义的认知理论,从数学教师的视角出发,提出了理工科大学数学课程的学习模式,其核心是认知的建构主义.这个模式对数学概念的学习提出了三个步骤,对数学规则的学习提出了三项措施. 相似文献
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提出了洗衣粉溶解性的评价方法,并分析了影响洗衣粉溶解性的主要因素。同时,有针对性地提出了改善洗衣粉溶解性的控制措施。 相似文献
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分析了机盖电泳漆膜局部发黄产生的原因,并提出了解决措施,同时为电泳线的阳极排布提出了建议。 相似文献
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Antonio Casale 《应用聚合物科学杂志》1975,19(5):1461-1473
The influence of temperature is a fundamental variable for the mechanochemical processes of high polymers. However, it is generally recognized that the effect of temperature in this process is not always direct, as in normal chemical reactions, but is mainly indirect involving change in the properties (principally elastic and viscous), in the physical state of the system, and consequently in the mechanism of rupture. The negative temperature coefficient has been considered a prime criterion of a mechanochemical reaction by many researchers. Recently, it has been suggested that the negative temperature coefficient is really due to the viscous heating during polymer deformation and the low thermal conductivity of polymers. The aim of this paper is to reevaluate the role of temperature on mechanically induced reactions of polymers. In light of evidences published in the last 30 years, the dependence of mechanochemical reaction on temperature must involve the overlapping of the following factors: (1) the usual positive dependence of rate on temperature, as predicted by Arrhenius equation; (2) the true experimental temperature, which depends on viscous heating and on thermostatting efficiency; and (3) the breaking tension at the center of the polymer chain which is inversely dependent on temperature, i.e., greater at the higher viscosity and the slower relaxation at the lower temperatures, this last factor being dominant in determining the characteristic negative temperature coefficient for polymer mechanochemistry. 相似文献
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K. Cronin D. Mackey V. Cregan S. OBrien J.P. Gleeson K. Abodayeh 《Food and Bioproducts Processing》2007,85(4):344-353
Random variability in product thermal properties combined with non-uniformity in the process environment can cause a distribution in product temperature at the end of a heating stage. This unwanted dispersion can affect the integrity and profitability of the operation. The dispersion can be quantified with the statistics of range, minimum or variance. This paper demonstrates how the magnitude of this dispersion is sensitive to the level of processing temperature that is employed. It explains and gives a criterion by which the process environment can be judged as being either uniform or non-uniform. Furthermore the paper demonstrates that using a certain processing time will minimize the variance in product temperature. Using a case study, involving the heat treatment of foods, the strategies that can be employed to control product temperature dispersion, through selection of the process temperature, are outlined. 相似文献
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温度对温敏性固定化酶的相对活力影响研究 总被引:1,自引:0,他引:1
以N 异丙基丙烯酰胺 (PNIPAM)均聚凝胶和N 异丙基丙烯酰胺与丙烯酰胺 [P(NIPAM -AM) ]共聚凝胶为载体制备了四种温敏性固定化酶。其相对活力 (f)随温度的升高而降低 ,在凝胶低临界溶解温度LCST(32 0℃ )附近骤降 (均聚枯草杆菌蛋白酶的f在 32 0℃前后由 86 2 %降至 18 8% ) ,即高温下 (LCST以上 )酶从凝胶中释放出来 ,说明温敏性凝胶可用作生物固定化催化剂的功能性载体。 相似文献
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文章主要探讨广泛应用于工矿企业、科研单位的实验室中的箱型电阻炉温场测试及温控系统的调整。分为温场均匀性检测、温控系统豹准确度的检测和温控系统的调整三个部分,介绍箱型电阻炉温场测试所需的设备和方法以及温控系统调整的一些技巧。 相似文献