全文获取类型
收费全文 | 1360篇 |
免费 | 145篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 1篇 |
综合类 | 90篇 |
化学工业 | 274篇 |
金属工艺 | 6篇 |
机械仪表 | 9篇 |
建筑科学 | 7篇 |
能源动力 | 2篇 |
轻工业 | 827篇 |
无线电 | 50篇 |
一般工业技术 | 231篇 |
自动化技术 | 14篇 |
出版年
2024年 | 2篇 |
2023年 | 17篇 |
2022年 | 43篇 |
2021年 | 91篇 |
2020年 | 68篇 |
2019年 | 44篇 |
2018年 | 49篇 |
2017年 | 52篇 |
2016年 | 64篇 |
2015年 | 93篇 |
2014年 | 89篇 |
2013年 | 133篇 |
2012年 | 64篇 |
2011年 | 91篇 |
2010年 | 35篇 |
2009年 | 55篇 |
2008年 | 26篇 |
2007年 | 87篇 |
2006年 | 95篇 |
2005年 | 107篇 |
2004年 | 53篇 |
2003年 | 32篇 |
2002年 | 32篇 |
2001年 | 26篇 |
2000年 | 18篇 |
1999年 | 9篇 |
1998年 | 11篇 |
1997年 | 12篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 5篇 |
1993年 | 1篇 |
1992年 | 1篇 |
1987年 | 1篇 |
1983年 | 1篇 |
排序方式: 共有1511条查询结果,搜索用时 0 毫秒
11.
This study focused on fabrication of the thermochromic microcapsules and their application to the cotton fabric. In this study, thermochromic systems composed of crystal violet lactone, bisphenol A, and 1-tetradecanol were prepared and microencapsulated by emulsion polymerization method in poly(methyl methacrylate-co-ethylene glycol dimethacrylate-co-glycidyl methacrylate) wall. The microcapsules were analyzed by Fourier transform infrared spectroscopy, scanning electron microscope, transmission electron microscope, differential scanning calorimetry, and thermogravimetric analysis. Their thermoregulating property was tested by T-history test. The results revealed that microcapsules with smooth surfaces, core–shell structured, and spherical shape were successfully produced. The latent heat storage capacity of the microcapsules decreased from 202 J g−1 to 167 J g−1 when their shell/core ratio changed from 0.5/1 to 2/1. Microcapsules were adequately had sufficient thermal resistance to the temperatures they will encounter during their application to textile products and their usage. According to the UV–visible spectroscopy analysis and color measurements, the microcapsules exhibited reversible color change from blue to colorless and vice versa. Besides, the microcapsule impregnated fabric was able to absorb latent heat energy of 21.79 J g−1 at around 35 °C and had cooling effect. According to the colorimetric parameters, the fabric was at blue color at room temperature and became colorless when heated to the temperature above the melting point of thermochromic system. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48815. 相似文献
12.
13.
再利用技术的发展是促进废旧纺织品回收再利用的根本。本文从纺织品与环境资源的关系着手,综述了近年来废旧涤棉类纺织品再利用技术方面的发展现状。分析后得出:涤棉类织物再利用技术发展较快;物理法从简单的机械利用向物理熔融和溶解多元化方向发展;化学法从传统的造纸或降解向生物质材料应用方向发展;生物酶解技术也得到了关注。另外,涤棉混纺织物从只利用涤纶或棉纤维的单一模式向综合利用发展,同时越来越多的跨学科研究融入到废旧涤棉织物再利用技术上来。目前,一些研究方法虽已初步应用,但由于技术的局限性,再利用情况仍不乐观。 相似文献
14.
从2005年起,在我国境内生产、销售和使用的纺织品,将执行新的强制性国家标准GB 18401-2003《国家纺织产品基本安全技术规范》。本文从新标准规定的检测项目及指标、国内纺织品的现状,分析了新标准的实施对我国纺织品产生的影响。 相似文献
15.
16.
17.
Laccase‐mediated grafting of polyphenols onto cationized cotton fibers to impart UV protection and antioxidant activities 下载免费PDF全文
Suyeon Kim Hyunkyung Lee Juhea Kim Fernando Oliveira Pedro Souto Hyerim Kim Javier Nakamatsu 《应用聚合物科学杂志》2018,135(6)
Enzyme‐mediated in situ functionalization of cotton fibers was studied using laccase. Caffeic acid and morin were used as reactive phenolic substrates for laccase and further employed to the modification of fiber surfaces. Laccase‐mediated oxidation and polymerization reactions of caffeic acid were monitored by ultraviolet–visible spectroscopy. During the wetting process, initial cationization of fiber surfaces using poly(diallyldimethylammonium chloride) followed by enzymatic treatment with phenolic substrates resulted ineffective polymer grafting evidenced by high color stability. Changes of fiber surface properties by polymer grafting, such as morphology and hydrophilicity/hydrophobicity, were tested using scanning electron microscopy and gravimetric absorption tests. An acceptable level of color resistance to washing stress was obtained on caffeic acid treated samples, and a high level of rubbing resistance was obtained on samples treated with both caffeic acid and morin. Regarding the ultraviolet protection test, the cationized and enzymatically functionalized samples showed a very good protection grade (ultraviolet protection factor = 25). Finally, the antioxidant activity test of the modified fibers presented an improvement for radical scavenging potential due to the phenolic compounds incorporated to cotton fibers by laccase‐mediated catalysis. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 45801. 相似文献
18.
19.
20.
热致感应型形状记忆高分子材料在纺织领域的应用 总被引:1,自引:0,他引:1
介绍了热致感应型形状记忆高分子材料的记忆恢复原理、生产加工方法及在纺织上的应用,阐述了其在纺织领域广阔的发展前景。 相似文献