全文获取类型
收费全文 | 324篇 |
免费 | 24篇 |
国内免费 | 15篇 |
专业分类
电工技术 | 8篇 |
综合类 | 7篇 |
化学工业 | 129篇 |
金属工艺 | 24篇 |
机械仪表 | 25篇 |
建筑科学 | 27篇 |
矿业工程 | 3篇 |
能源动力 | 7篇 |
轻工业 | 24篇 |
水利工程 | 2篇 |
石油天然气 | 39篇 |
无线电 | 6篇 |
一般工业技术 | 41篇 |
冶金工业 | 13篇 |
原子能技术 | 1篇 |
自动化技术 | 7篇 |
出版年
2024年 | 2篇 |
2023年 | 9篇 |
2022年 | 12篇 |
2021年 | 8篇 |
2020年 | 9篇 |
2019年 | 14篇 |
2018年 | 9篇 |
2017年 | 8篇 |
2016年 | 11篇 |
2015年 | 7篇 |
2014年 | 20篇 |
2013年 | 21篇 |
2012年 | 19篇 |
2011年 | 21篇 |
2010年 | 25篇 |
2009年 | 14篇 |
2008年 | 25篇 |
2007年 | 17篇 |
2006年 | 20篇 |
2005年 | 20篇 |
2004年 | 20篇 |
2003年 | 11篇 |
2002年 | 8篇 |
2001年 | 7篇 |
2000年 | 8篇 |
1999年 | 7篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1990年 | 1篇 |
排序方式: 共有363条查询结果,搜索用时 31 毫秒
361.
论新时代下的先进包装系统 总被引:1,自引:1,他引:1
面对转变经济发展方式的新形势,在回顾包装系统发展历史的基础上,对今后值得研发的低碳包装、绿色包装、生态包装、智慧包装、安全包装等先进包装系统进行了全面的探讨,以期对包装科技工作者的研究方向提供一定的参考。 相似文献
362.
Kun Lei Meijun Chen Pengshan Guo Junjun Fang Jianbo Zhang Xin Liu Weiyi Wang Yashi Li Zhigang Hu Yujin Ma Hongwei Jiang Jingqiang Cui Jinghua Li 《Advanced functional materials》2023,33(41):2303511
Hydrogels have been widely explored to adapt to different application circumstances. As typical wet-soft materials, the high-water content of hydrogels is beneficial to their wide biomedical applications. Moreover, hydrogels have been displaying considerable application potential in some high-tech areas, like brain-computer interface, intelligent actuator, flexible sensor, etc. However, traditional hydrogel is susceptive to freezing below zero, dehydration, performance swelling-induced deformation, and suffers from mechanical damage in extremely mechanical environments, which result in the loss of wet-soft peculiarities (e.g., flexibility, structure integrity, transparency), greatly limiting their applications. Therefore, reducing the freezing point, improving the dehydration/solution resistance, and designing mechanical adaptability are effective strategies to endow hydrogels with the extreme environmental adaptability, thus broadening their application fields. This review systematically summarizes research advances of environmentally adaptive hydrogels (EAHs), comprising anti-freezing, dehydration-resistant, acid/base/swelling deformation-resistant, and mechanical environment adaptive hydrogels (MEAHs). Firstly, fabrication methods are presented, including the deep eutectic solvent/ionic liquid substituent, the addition of salts, organogel, polymer network modification, and double network (DN) complex/nanocomposite strategy, etc. Meanwhile, the features of different approaches are overviewed. The mechanisms, properties, and applications (e.g., intelligent actuator, wound dressing, flexible sensor) of EAHs are demonstrated. Finally, the issues and future perspectives for EAHs’ researches are demonstrated. 相似文献
363.
Wenping Yang Longjiao Zhu Min Yang Wentao Xu 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(2):2204782
Nanozymes and amorphous nanomaterials attract great attention owing to their extraordinary properties. However, the requirements for special synthesis conditions become the bottleneck of their development. Herein, a new strategy involving the DNA-based coordination-driven self-assembly is reported for the synthesis of a novel amorphous/crystalline hetero-phase nanozyme (Fe-DNA). For the synthesis of both nanozymes and amorphous materials, this strategy is simple and controllable, avoiding the traditionally employed harsh conditions. Benefitting from the amorphous structure and the superior physicochemical properties, the synthesized Fe-DNA nanozyme is subsequently found to exhibit a smaller Michaelis constant value for hydrogen peroxide (H2O2) (0.81 mm ) than that of horseradish peroxidase (HRP) (3.70 mm ), demonstrating the stronger affinity of the Fe-DNA nanozyme toward H2O2. The Fe-DNA nanozyme also shows significant peroxidase-like activity but only negligible oxidase-like activity, a characteristic which releases the corresponding assay system from oxygen interference, thereby improving the performance of the nanozyme-based sensing platform. In addition, compared with other nanozymes, the novel Fe-DNA nanozyme is degradable via phosphate; thus, mitigating potential environmental threat. This work provides novel amorphous/crystalline hetero-phase nanozymes and opens a new avenue for the design of amorphous nanomaterials and nanozymes. 相似文献