共查询到20条相似文献,搜索用时 437 毫秒
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石油化工生产具有高风险的特点。结合石油化工生产的实际情况,优化安全环保管理措施,提高石油化工生产的安全环保性。防止发生安全事故,降低石油化工生产的成本,不断提高石油化工生产的经济效益。分析石油化工生产中存在的安全隐患问题,采取安全监管措施,保证石油化工生产的顺利进行,达到预期的生产效率。 相似文献
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选用硬脂酸(HSt)与钛酸酯偶联剂131分别对芳香酸钙(CaT)表面进行处理;观察了处理前后CaT在聚氯乙烯(PVC)中的分散状况与界面结合。研究了CaT对PVC拉伸性能、冲击性能的影响。结果表明,CaT表面未处理,当其含量为4份时,PVC的缺口冲击强度由2.9kJ/m~2提高至3.6kJ/m~2,拉伸强度略有上升;CaT表面经3%HSt处理后,分散性能变好,改性效果明显,当其含量为4份时,PVC的综合性能最好,其拉伸强度由53.5MPa提高至56.0MPa,缺口冲击强度由2.9kJ/m~2上升至3.7kJ/m~2。CaT表面经2%钛酸酯偶联剂131处理后,界面结合性能明显变好,当其含量为6份时,PVC的综合性能最好,其拉伸强度由53.5MPa上升至57.5MPa左右,缺口冲击强度由2.9kJ/m~2上升至4.05kJ/m~2;扫描电子显微镜发现CaT表面处理后,在PVC中分散更加均匀,界面结合得更好,更大程度发挥了刚性粒子增韧效果。 相似文献
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责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体. 相似文献
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循环冷却水中杀生剂适宜使用条件的研究 总被引:1,自引:0,他引:1
张汉杰 《化学工业与工程技术》2006,27(4):7-9
选用氧化型杀生剂二氯异氰尿酸钠来抑制循环冷却水中微生物的生长,分别将药剂的投加质量分数、温度、接触时间、pH值等4个因素作为变量对杀生效果进行评价。研究表明,杀生剂的质量分数对杀生率的影响最大,其次是时间。再次是pH值,最后是温度;适宜条件为杀生剂的质量分数4μg/ g,时间6.8 h,温度36℃,pH值为6.8,此条件下杀生效果最佳。 相似文献
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以均匀沉淀法作为纳米氧化锌铝掺杂的制备方法。通过正交试验,考察了铝离子掺杂量、煅烧温度等反应参数对纳米氧化锌粉体粒径的影响。结果表明:水解温度的影响最大,其次是煅烧时间,尿素配比和煅烧温度影响较小;最佳工艺为以OP-10做表面活性剂,锌离子浓度0.3 mol/L,水解时间4h,尿素与锌离子摩尔比为3,水解温度95℃,煅烧温度450℃,煅烧时间2 h,铝离子的最佳掺杂量(以锌离子的摩尔数为基准)5%。对铝掺杂纳米氧化锌进行了XRD、SEM粒径分析,结果表明掺杂效果良好,得到的铝掺杂纳米氧化锌粒径最小可达到20 nm。 相似文献
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大麻秆芯是大麻的废弃物,一种优质的木质纤维原料。为了更好地开发和利用这种原料,论文主要对大麻秆的显微构造和纤维形态进行了研究,结果表明大麻秆的显微构造类似于阔叶材的散孔材。大麻秆皮部的纤维平均长度为22.7 mm,平均壁腔比为0.40,平均长宽比为705.38,83.5%纤维的长度为11~30 mm,72%的细胞长宽比为310~900,72%的壁腔比为0.11~0.50;是一种长度大、壁腔比小、长宽比大的优质纤维原料。而木质部的纤维平均长度为0.65 mm,平均壁腔比为0.32,平均长宽比为29.53,92%纤维的长度为0.41~0.90 mm,91.5%纤维的长宽比为11~50,66%纤维的壁腔比为0.11~0.40;是一种长度中等,长宽比大,壁腔比小的优质原料,可用于造纸和人造板制造的工业原料。 相似文献
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Mechanical thermal expression (MTE) is a dewatering technology ideally suited for the dewatering of internally porous biomaterials. For such materials, the combined application of temperature and compressive force in the MTE process enhances the collapse of the porous structure, resulting in effective water removal. In this article, a comparison of the dewatering of titanium dioxide, which is an ideal incompressible, non-porous material, and lignite, which is a porous plant-based biomaterial, is presented. The comparison is based on the parameters critical to dewatering, namely the material compressibility and the permeability. With the aid of mercury porosimetry results, a detailed discussion of the pore destruction of lignite resulting from MTE processing is presented. It is illustrated that there is a well-defined relationship between the pore size distribution after MTE dewatering and the MTE temperature and pressure. The discussion is extended to an investigation of the effects of MTE processing conditions on the effective and non-effective porosity. The effective porosity is defined as the interconnected porosity, which contributes to flow through the compressed matrix, while the non-effective porosity is the remaining porosity, which does not contribute to flow. It is illustrated that there is a linear relationship in both the effective and non-effective porosity with the total porosity. The linear relationship is independent of the processing conditions. It is also shown that MTE processing collapses the effective and non-effective pores at roughly the same rate. 相似文献
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ABSTRACT Relationship between thermal stabilizing effect of sugar on freeze-dried protein and sugar-protein hydrogen bond is studied. Sucrose and lactate dehydrogenase (LDH) are used as models for sugar and protein. Samples of freeze-dried LDH involved in sucrose of different crystallinity were prepared, and measurement of X-ray diffractometry (XRD)/ and Fourier-Transform Infrared (/FT-IR)/ spectroscopy was done. It is found that when sucrose is amorphous, the degree of hydrogen bond formation is high and LDH is stabilized; when sucrose is crystalline, hydrogen bond is less formed and LDH is inactivated. These results indicate that the stabilizing effect of sugar is closely related to sugar-protein hydrogen bond. It is also found that there is an optimum sucrose content for the thermal stabilizing effect. This is because amorphous structure of sucrose is stabilized and protected from crystallization by LDH. Thus we car deduce that sugars and proteins work together to keep the activities of proteins. 相似文献
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The adhesive contact between a sphere and a longitudinal wavy surface is simulated numerically. A modified simulation method is proposed using the Newton BI-CGSTAB method in a rectangular coordinate. The effective Tabor parameter is proposed. It is found that when the amplitude of the wavy surface is larger, the contact area is smaller and the pull-off force is smaller. Jump-in from noncontact phenomena occurs when the Tabor parameter is large. Jumping from one ridge to the next ridge occurs when the effect of the Tabor parameter is large and the amplitude of the wavy surface is not too small. Jumping from noncontact to full contact is affected by the amplitude and the wave number of the wavy surface and is also affected by the Tabor parameter. 相似文献
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从排气冷凝器列管振动的角度分析出列管失效的主要原因是卡门旋涡振动引起列管疲劳损伤而萌发疲劳裂纹和裂纹扩散 ,以至穿透壁厚而泄漏、断裂。提出的解决方案是适当加厚折流板 ,缩小折流板管孔与管子的间隙 ,减少管子无支承的最大跨距 ,增加管子壁厚 ,设置防冲板等。也可采用折流板缺口处不布管的设计思想或抗振型换热器。 相似文献