共查询到20条相似文献,搜索用时 62 毫秒
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多种独特工艺的完美融合,与全球页级的艺术大师合作,独有的颜色选择方式……Venini紧握三大法宝,将玻璃工艺提升为一种艺术,引领着世界玻璃艺术的发展潮流。 相似文献
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在意大利威尼斯湖中有一个由小岛组成的地区,这里以盛产琉璃制品著称,这就是被誉为“威尼斯琉璃之岛”的穆拉诺。
威尼斯的琉璃生产有着悠久的历史,从欧洲中古时代就开始了。最初,威尼斯的琉璃工厂都集中在市区,1291年威尼斯当局为了安全起见并且达到对琉璃业的完全控制,强制要求全部的琉璃工厂搬迁到威尼斯外海的穆拉诺,并勒令工匠们世代不得迁离该岛,而且,他们做的产品不得私自出售,专业知识不得以书面记录。不过,工匠们也可以得到相当的补偿,诸如工作稳定,有发展的工人家庭可被视为望族,其女儿可以嫁给贵族等。其后约250年内,穆拉诺的琉璃制造技术得到了高度且稳定的发展。 相似文献
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硅橡胶在防毒面具中的应用 总被引:3,自引:0,他引:3
对国内外的防毒面具罩体橡胶的水平进行了分析,通过对硅橡胶在防毒面具中的应用研究,选出了较好的配方用于防毒面具的导流罩,但作罩体材料还需进一步研究。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(22):2531-2541
Abstract Micropatterning of surfaces has been demonstrated using composite polymer coatings of PS and PMMA of equal molecular weights in different volume proportions with varying surface topographies on silicon surfaces. The creation of PMMA masks with various surface morphological features has also been demonstrated by removal of PS from the composite coatings using cyclohexane. Atomic force microscopy (AFM) investigations revealed that the surface pattern and the dimensions of these masks significantly changed with the change in the volume proportions of each homopolymer. The composite coatings of 20/80 vol% PS/PMMA, 50/50 vol% PS/PMMA, and 80/20 vol% PS/PMMA resulted in PMMA masks with holes (depth ~300 nm), wrinkles (height ~350 nm) and pillars (height ~600 nm), respectively. Surface compositional analysis carried out using FTIR and XPS investigations confirmed the presence of polymer coatings of PS, PMMA and PS/PMMA. XPS investigations also confirmed the successful removal of PS from the PMMA mask by showing the presence of the silicon substrate on those masks where PS was previously present. The water contact angle of the composite polymer masks ranged from 70 to 90° which increased with the increase of PS vol% in the composite. The wetting behavior of certain PMMA masks showed hydrophobicity with water contact angle values above 90°. 相似文献
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面具在古代先民的社会生活有着非常重要的地位,它掩容增威,沟通了人神之间的距离,是古代先民对生的希冀和对死的恐惧的膜拜物。面具雕刻在中国已有几千年的历史。早在商周时期,上至宫廷,下至民间,每年都要在季春、仲秋、季冬举行傩祭活动。在庞大的傩仪活动中,主持傩祭的中心人物就是“头戴面具”的方相氏。那时,人们就开始雕刻面具。 相似文献
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Dr. Angela H. Soeriyadi Dr. Sarah E. Ongley Dr. Jan-Christoph Kehr Dr. Russel Pickford Prof. Elke Dittmann Prof. Brett A. Neilan 《Chembiochem : a European journal of chemical biology》2022,23(3):e202100574
Indolactam alkaloids are activators of protein kinase C (PKC) and are of pharmacological interest for the treatment of pathologies involving PKC dysregulation. The marine cyanobacterial nonribosomal peptide synthetase (NRPS) pathway for lyngbyatoxin biosynthesis, which we previously expressed in E. coli, was studied for its amenability towards the biosynthesis of indolactam variants. Modification of culture conditions for our E. coli heterologous expression host and analysis of pathway products suggested the native lyngbyatoxin pathway NRPS does possess a degree of relaxed specificity. Site-directed mutagenesis of two positions within the adenylation domain (A-domain) substrate-binding pocket was performed, resulting in an alteration of substrate preference between valine, isoleucine, and leucine. We observed relative congruence of in vitro substrate activation by the LtxA NRPS to in vivo product formation. While there was a preference for isoleucine over leucine, the substitution of alternative tailoring domains may unveil the true in vivo effects of the mutations introduced herein. 相似文献