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某包装件的有限元建模及动态性能研究 总被引:2,自引:0,他引:2
研究包装件为纸浆模塑缓冲包装衬垫,考虑非线性在有限元软件中的应用,建立和使用瞬态动力学模块仿真分析包装件在运输过程中的振动特性,仿真得到包装件的加速度响应及缓冲衬垫的加速度、最大应力、等效应力等云图。利用Lansmont振动试验系统对包装件进行扫频定频振动试验,得到包装件的加速度响应等,最后比较仿真结果与试验结果。 相似文献
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The volatile flavor compounds of fresh, frozen beef stew were isolated, fractionated and identified by standard methodology. A total of 132 compounds was either positively or tentatively identified. A comparison of the volatile compounds and their relative amounts in the fresh, frozen stew with those previously identified in canned stew demonstrated both qualitative and quantitative differences between the volatiles of the two stews. This difference was due mostly to the greater number and amounts of the oxygen-containing compounds such as alcohols, 2-alkenals, esters, lactones, and ionones found in the fresh, frozen stew as compared with the greater number and amounts of hydrocarbons and nitrogen and/or sulfur-containing heterocycles found in the canned stew. 相似文献
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Megan E. Whelan Olivia R. L. Wright 《Critical reviews in food science and nutrition》2016,56(1):146-151
Aim: The purpose of this review was to assess existing evidence on the effects of chronic dietary macronutrient composition on substrate oxidation during a fasted state in healthy and overweight subjects. Methods: A systematic review of studies was conducted across five databases. Studies were included if they were English language studies of human adults, ≥19 years, used indirect calorimetry (ventilated hood technique), specified dietary macronutrient composition, and measured substrate oxidation. Results: There was no evidence that variations of a typical, non-experimental diet influenced rate or ratio of substrate utilization, however there may be an upper and lower threshold for when macronutrient composition may directly alter preferences for fuel oxidation rates during a fasted state. Conclusion: This review indicates that macronutrient composition of a wide range of typical, non-experimental dietary fat and carbohydrate intakes has no effect on fasting substrate oxidation. This suggests that strict control of dietary intake prior to fasting indirect calorimetry measurements may be an unnecessary burden for study participants. Further research into the effects of long-term changes in isocaloric macronutrient shift is required. 相似文献
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Breen JJ 《Environmental science & technology》1996,30(6):258A-259A
A review of Industrial Ecology and Industrial Ecology and Global Change. 相似文献
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实施西部大开发,预示着西部地区发展机遇的到来?结合西部大开发对陕西粮食流通发展的积极影响,结合全省国有粮食企业的现状及存在问题,提出了加快陕西国有粮食企业跨越式发展的对策。 相似文献
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Kelsey Erin McClellan 《Textile》2017,15(1):86-107
A phenomenological inquiry of the islands of Lewis and Harris provides a foundation for the cloth that is made there, which in tag and reputation conveys its relationship to “place.” Tweed is a cloth historically born out of place-based tensions, which express themselves socially and materially in the vehicle of this woven proxy. Using Harris Tweed as a primary case study, this tension is addressed in a narrative examination of insiders and outsiders to conclude that the fabric of tweed—as well as the nationalisms, social fabric, and industry so iconic to it—is constructed with contrasts and differences, and not in spite of them. This examination proves relevant to tweed’s historic role as “British National Costume,” especially in light of the 2014 Scottish independence referendum and the 2016 Brexit vote. 相似文献
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Petkewich R 《Environmental science & technology》2005,39(17):362A-367A
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24年,可谓是很短暂的,但对于一个民营企业成长来说,其中的波折艰难,是外界难以想象的。宝福珠宝自创建以来,凭借着超前的眼界和胆识,克服重重困难,在竞争激烈的珠宝领域打造出一片辉煌的天地,从最初单纯的加工生产发展成现在的全球领先珠宝研发生产综合服务商。目前,宝福珠宝已经发展成为拥有黄金、铂金与镶嵌饰品三大产品生产线和集研发、设计、生 相似文献
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目前,印刷行业面临着日趋激烈的竞争。各印刷企业为增加在市场竞争中的砝码.不断加大对印刷设备的投入,尤其是对印前新设备的增加及更新。再加上CTP技术的日趋成熟,CopyDot扫描仪(称网点拷贝扫描仪,有滚筒型和平板型之分)已经展示出难以抗拒的魅力。它快速弥补了版面需要修版、补版的技术缺陷.成为CTP技术、数字印刷技术以及远程传版的先行军。特别是随着印刷市场的不断开放,针对书刊印刷企业而言,购置网点拷贝扫描仪已经是实现企业利润最大化的关键所在。 相似文献
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本文通过剖析包豪斯的室内设计教育整合之路,通过以格罗皮乌斯为代表的包豪斯新住宅思想的研究,阐述包豪斯在室内设计上所作的深入探索与突出贡献,向人们展示隐藏在包豪斯建筑光环之下的室内设计图景。 相似文献
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对经双氧水漂白后的毛织物用壳聚糖整理,用酸性染料分别对经漂白和壳聚糖整理的2批羊毛织物染色,测试2批羊毛织物染色的K/S值,并计算固色率。实验结果表明,壳聚糖整理能显著提高毛织物的染色深度,壳聚糖用量是影响染色深度的主要因素,壳聚糖用量为0.4%(owf)时能够得到最高的染色深度。壳聚糖整理漂白毛织物染色的最优方案为:壳聚糖用量0.4%(owf),pH值3.5,温度95℃,染色时间45 m in。 相似文献
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<正>今年,你为学业功课买了多少本书?你在空闲时间读些什么书?如果对上述问题的回答都为零,那你正是大多数柬埔寨人中的一员。加上出售的很多书籍都是盗版的这一现实,由此很容易看出,为什么柬埔寨的图书出版业处于苦苦挣扎之中的原故。 相似文献
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《诗经》中的咏蚕内容有30多处,遍及黄河流域五省,而黄河流域是我国文化的发祥地,也是我国蚕业起源的中心。诗中的咏蚕内容,展现了我国蚕文化的源远流长,为研究我国西周时期的养蚕业,提供了丰富的史料。 相似文献
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<正>最近几年,上海的图书印订加工质量逐年下降,在连续几次全国性质量检查中,上海的排名已跌到中下游水平,这和上海蓬勃发展的出版事业极不相称,也和上海印刷业的发展目标相差甚远。是什么原 相似文献
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本文介绍美国中国史学者曾小萍女士的新著《自贡商人:近代中国早期的工业企业家》。该书以19世纪中叶至20世纪中叶的自贡井盐业和自贡商人为对象,研究中国本土公司的历史变迁。该书作者认为,法律、金融习俗机制、宗族和族产制度是中国本土公司发展的制度基础,即使19世纪中叶以后西方的商业组织和法律进入中国,这些制度仍然表现了良好的适应性。 相似文献