共查询到20条相似文献,搜索用时 78 毫秒
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为研究纯棉纱线合股数对织物力学性能和保形性的影响,采用线密度相同的单纱、双股线、3股线、4股线4种股线类型,以适当的经、纬密分别织制成平纹、斜纹、缎纹组织的织物。对织物的拉伸性能、撕裂强力、拉伸弹性、折皱回复性、悬垂性、弯曲性进行测试与分析。结果表明:3股线织物的断裂强力和撕裂强力较大,4股线织物的断裂伸长率较大,双股线织物的拉伸弹性回复率较大;平纹织物仅有双股线织物的折皱回复性优于单股线织物,斜纹和缎纹织物的折皱回复性随合股数的增加均变差;双股线平纹织物悬垂性相对较好,但均没有斜纹和缎纹织物的悬垂性好;单纱织物的弯曲性能比股线织物好。 相似文献
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单纱强力仪测试速度对纱线强力指标的影响 总被引:1,自引:1,他引:0
为提高高速单纱强力仪测试纱线强力的准确性,从分析影响其测试指标因素入手,详细论述了单纱强力仪的测试原理、拉伸速度对纱线强力指标的影响及原因,通过试验数据对比,指出:①在相同试验条件下,各种纱线的断裂伸长率、断裂强力CV值与速度提高没有显著变化,但断裂时间平均值随拉伸速度增加显著减少;②断裂强力随拉伸速度的提高会有不同的... 相似文献
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通过研究纱线的断裂机理,结合拉伸图实验对纯毛单纱的拉伸性能进行了测试、分析。同时通过使用统计软件SPSS10.0对66批工厂测试数据进行了统计分析,结合毛条品质指标及影响纱线强力与纱线断裂伸长的预测模型,分析了影响纯毛单纱拉伸性能的主要因素. 相似文献
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捻度和线密度是决定纱线强度的关键参数,也是影响织物及其复合材料力学性能的重要因素。为优化纱线的力学性能,探究捻度对涤纶单纱拉伸力学性能的影响,采用纱线加捻机对涤纶单根纤维和涤纶单纱进行加捻,通过动态热机械分析仪和电子万能拉力机分别表征涤纶单根纤维和单纱的拉伸力学性能,研究捻度与不同线密度涤纶单纱拉伸力学性能之间的关系。实验结果表明:涤纶单根纤维和单纱加捻后,他们的断裂强度均存在临界捻度,涤纶单纱断裂强力随捻度增大而先增加后减小;涤纶单纱的断裂伸长率与捻度成正相关,为加捻纱线在厚重织物等复合材料的使用提供了理论参考。 相似文献
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Figueroa-González I Quijano G Ramírez G Cruz-Guerrero A 《Journal of the science of food and agriculture》2011,91(8):1341-1348
Owing to their health benefits, probiotics and prebiotics are nowadays widely used in yogurts and fermented milks, which are leader products of functional foods worldwide. The world market for functional foods has grown rapidly in the last three decades, with an estimated size in 2003 of ca US$ 33 billion, while the European market estimation exceeded US$ 2 billion in the same year. However, the production of probiotics and prebiotics at industrial scale faces several challenges, including the search for economical and abundant raw materials for prebiotic production, the low-cost production of probiotics and the improvement of probiotic viability after storage or during the manufacturing process of the functional food. In this review, functional foods based on probiotics and prebiotics are introduced as a key biotechnological field with tremendous potential for innovation. A concise state of the art addressing the fundamentals and challenges for the development of new probiotic- and prebiotic-based foods is presented, the niches for future research being clearly identified and discussed. 相似文献
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常用消毒灭菌法及其机理与应用 总被引:3,自引:0,他引:3
介绍了采用消毒灭菌方法,有加热消毒法,紫外线辐射法和化学药剂消毒法。常用化学药剂有醛类、含氯消毒剂、醇类消毒剂以及高锰酸钾、生石灰等,阐释了消毒与灭菌两个概念的区别。 相似文献
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Wim Verbeke Federico J.A. Pérez-Cueto Marcia D. de Barcellos Athanasios Krystallis Klaus G. Grunert 《Meat science》2010
This paper presents the combined mid-term findings of the consumer research components of two EU Sixth Framework Programme integrated projects concerning meat, ProSafeBeef and Q-PorkChains. The consumer pillar of ProSafeBeef carried out eight focus group discussions in May 2008, in France, Germany, Spain and the UK. Q-PorkChains conducted a large-scale, web-based, consumer survey in January 2008 in Belgium, Denmark, Germany, Greece and Poland. The first project provides a set of qualitative data from a small cohort of focus groups and the second a set of quantitative data from a larger consumer sample. This paper draws together the main findings of both projects and provides a comprehensive overview of European citizens’ and consumers’ attitudes towards and preferences regarding beef and pork. In general, consumers consider meat to be a healthy and important component of the diet. Consumers support the development of technologies that can improve the health attributes of meat products and guarantee eating quality, but they have a negative view of what they see to be excessive manipulation and lack of naturalness in the production and processing of beef products. In the Q-PorkChains study consumer and citizen segments are identified and profiled. Consumer segments were built upon the frequency and variety of pork consumption. The citizen segments were built upon their attitudes towards pig production systems. Overall, the relationship between individuals’ views as citizens and their behaviour as consumers was found to be quite weak and did not appear to greatly or systematically influence meat-buying habits. Future studies in both projects will concentrate on consumers’ acceptance of innovative meat product concepts and products, with the aim of boosting consumer trust and invigorating the European beef and pork industries. 相似文献
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果蔬可以提供营养, 有利于人类健康, 而果蔬的后熟及其与环境的相互作用会影响果蔬采后的质量和安全。对果蔬生物学过程的了解和掌握是减少果蔬采后损失和保障果蔬采后质量和安全的关键。在过去的10多年, 基于组学技术的系统生物学在了解果蔬后熟及其与环境相互作用的分子机制方面得到了越来越多的应用。本文对此做了细致的总结, 指出了存在的不足, 并提出了未来的发展方向。 相似文献
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研究建立了螺虫乙酯及其4种主要代谢物在猕猴桃及土壤中的残留分析方法。样品用乙腈提取后,经PSA净化,高效液相色谱质谱联用仪检测,外标法定量。结果表明:在0.01~2.00mg/kg的添加水平下,螺虫乙酯及代谢产物在猕猴桃和土壤中的回收率为73.97%~110.52%,相对标准偏差分别为1.96%~7.91%。采用所建方法,测定螺虫乙酯及代谢产物在猕猴桃和土壤中的残留及消解动态。螺虫乙酯被施用到猕猴桃和土壤中后均迅速降解为B-enol、B-keto。在猕猴桃中螺虫乙酯、B-enol呈逐渐降低的趋势,而B-keto和B-mono呈逐渐升高的趋势;在土壤中螺虫乙酯、B-enol、B-keto均呈逐渐降低趋势,B-mono和B-glu在样品中均没有检出。螺虫乙酯和B-enol在土壤中的降解速度(1.42 d、1.99 d)快于在猕猴桃上的降解速度(4.08 d和6.39 d)。以3000倍液稀释液喷施2次,28 d后,猕猴桃中螺虫乙酯母体的残留量为0.06 mg/kg,高于我国制定的0.02 mg/kg的最大残留限量值,在猕猴桃上的安全使用剂量还需要进一步研究。 相似文献