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为改善传统纳米粉体光催化剂易团聚导致催化活性降低,且难以重复利用等问题,针对性地开发具有高活性位点暴露、高分散性和稳定性的纤维素基光催化复合材料是推动光催化技术产业化应用的有效途径。综述了国内外纤维素基有机-无机纳米光催化复合材料的研究进展。首先从纤维素的不同制备形态角度出发,分析了纳米纤维素、纤维素膜材料、纤维素气凝胶材料与纳米光催化材料的设计合成与制备机制,重点阐述了其在环境领域的最新应用进展,最后提出纤维素基光催化材料的发展前景以及存在的问题与局限性,为纤维素基功能材料今后的规模化制备和在环境修复材料领域的广泛应用提供参考。 相似文献
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为推动芳纶纳米纤维气凝胶从实验室走向实际应用,系统介绍了芳纶纳米纤维气凝胶国内外研究现状。首先分析了气凝胶领域面临的主要困难,阐述了芳纶纳米纤维气凝胶开发的重要意义;随后介绍了构筑单元芳纶纳米纤维的制备方法及其流变学行为,为后续芳纶气凝胶材料的制备提供参考;最后重点综述了芳纶气凝胶纤维、芳纶气凝胶薄膜以及3D打印芳纶气凝胶的制备、性能及应用等研究现状,总结了制备过程中一系列新型溶胶-凝胶转变原理,概述了芳纶气凝胶材料性能提升的策略以及在热管理、智能防护和分离过滤等新兴领域中的应用前景。分析认为,芳纶纳米纤维气凝胶发展仍处于初期阶段,优化芳纶纳米纤维气凝胶制备技术、进一步提升其性能仍将是研究的热点与重点。 相似文献
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相变储能是解决目前能源短缺的一种有效方式,相变材料(PCM)在相变过程中具有较大的储热容量,并在接近恒温的状态下具有潜在的热能存储能力。纳米纤维素是一种具有纳米级尺寸、较高热稳定性、丰富的亲水性羟基和表面活性位点的材料,作为复合相变材料的基材具有广泛的应用前景。本研究针对相变材料在相变过程中易泄漏和形状不稳定等问题,围绕纳米纤维素在复合相变材料中的作用,综述了纳米纤维素基气凝胶、纳米纤维素基微胶囊和其他纳米纤维素基复合相变材料的制备方法,展望了纳米纤维素基复合相变材料未来的研究方向。 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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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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The objectives of the current study were to investigate the relationship between body condition score (BCS) and dairy form and changes in genetic parameters for BCS and dairy form within and across lactations and age. Body condition score and dairy form were obtained from the Holstein Association USA, Inc. Records were edited to include those cows classified between 24 and 60 mo of age and between 0 and 335 d in milk (DIM). A minimum of 20 daughters per sire and 15 cows per herd-classification visit were required. The dataset consisted of 135,178 records from 119,215 cows. Repeatability, multiple trait, and random regression models were used to analyze the data. All models included fixed effects for herd-classification visit, age within lactations 1, 2, and 3 or higher, and 5th-order polynomials for DIM. Random effects included sire and permanent environment for all models. Random regression models included age at classification nested within sire or DIM and lactation number nested within sire. Genetic variance for both BCS and dairy form was lowest in early lactation and highest in midlactation. Genetic correlations within and across lactations were high. The genetic correlation between DIM 0 in lactation 1 and DIM 305 in lactation 3 was estimated to be 0.77 for BCS and 0.60 for dairy form. The genetic correlation estimate between 30 mo of age at classification and 50 mo of age at classification was 0.94 for both dairy form and BCS. The repeatability models appeared to generate accurate evaluations for BCS or dairy form at all ages and stages of lactation. 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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酚类物质的结构与性质及其与葡萄及葡萄酒的关系 总被引:20,自引:0,他引:20
酚类物质是一类大而复杂的化合物。葡萄与葡萄酒中常见的酚类物质可分为类黄酮和非类黄酮两大类,它们是葡萄中重要的次生代谢产物,与葡萄的抗病性、采后生理、贮存、保鲜等密切相关。葡萄酒中的酚类物质来自于葡萄果实、果梗、酵母代谢以及橡木桶,参与形成葡萄酒的味道、骨架、结构和颜色等,对红葡萄酒的特征和质量尤其重要。 相似文献