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《合成材料老化与应用》2015,(4)
介绍了复合材料构件知识库中的计算机辅助成型工艺系统。针对复合材料成型工艺参数种类多、难以管理、设计经验不能共享等问题,用基于特征推理的工艺方法应用于复合材料成型工艺的相似实例检索,同时提出了基于产生式规则的推理方法进行复合材料构件成型工艺的决策,给出了系统的总体设计结构,包括材料管理库、成型工艺实例库、模具参数管理库、成型工艺参数管理库和辅助成型工艺选择库。采用面向对象和组件技术实现了该设计方案。 相似文献
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重点介绍标准零件库、组件库的建库方法。基于UG/Part families建立参数化模具标准件库、组件库和模架库,其中组件的驱动是通过建立索引文件来实现的。 相似文献
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结合阿曼某5 000 t/d水泥生产线的工程设计实例,介绍了NFPA标准和中国消防标准对纸袋库自动喷水灭火系统的相关规定,分析比较了自动喷水灭火系统设计参数及自动喷水灭火系统组件的选择、布置等方面的差异,阐述了存在差异的理由,最后给出如何选择设计参数的建议。 相似文献
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利用VB和Automation Gateway实现对Pro/E系统注塑模具参数化标准模架库的二次开发,根据国家注塑模具模架设计标准,建立适应本国企业设计规范的标准模架库,用数据库分别存储各组件尺寸数据信息,做到模架所有组件具有独立参数化和变形化,从而使得模架库的应用更加广泛.该系统使用方便,性能稳定可靠,具有较高的实用价值. 相似文献
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研究开发了板式塔降液管机械消泡板组件。在降液管中加设特制的新型消泡板组件,该组件由数列若干块相互平行的倒V字形波纹板垂直排列组成,倒V字形波纹板的开口端向下。消泡板组件半浸于降液管泡沫层中,越堰的泡沫液与波纹板碰撞,以及波动的泡沫层不停地与波纹板摩擦,都加速泡沫的破裂,促进降液管内气液分离,降低了泡沫层高度。开口端向下的倒V字形波纹板还对降液管内液体产生向下的作用力,降低了降液管清液层高度。试验结果表明,对易起泡物系,降液管机械消泡板组件能降低泡沫层高度13.1%—36.2%,降低清液层高度10.5%—32.5%。对不易起泡物系,消泡板组件能降低泡沫层高度7.1%—33.2%,降低清液层高度5.1%—24.6%。因此,该消泡板组件可以起到降低降液管液层高度和延缓降液管液泛的作用,具有良好的消泡效果。 相似文献
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以液相沉积法在常温下于ITO透明导电玻璃上制备染料敏化二氧化钛太阳能电池中的二氧化钛层,并加以封装成ITO glass/[TiO2(N3 dye)]/I2 LiI electrolyte/Pt/ITO glass组件,探讨不同后热处理温度对于二氧化钛层的微观结构及染料敏化太阳电池组件光伏特性的影响.实验结果显示:随着热处理温度的提高,TiO2薄膜由非晶转为锐钛矿相结构,表面生成许多小缝隙、锥突及纤毛,使组件短路光电流明显提升10倍以上.最高短路光电流0.036 mA/cm2发生在沉积24 h并经600 ℃后热处理的镀膜上. 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