全文获取类型
收费全文 | 1469篇 |
免费 | 87篇 |
国内免费 | 53篇 |
专业分类
电工技术 | 13篇 |
综合类 | 64篇 |
化学工业 | 844篇 |
金属工艺 | 8篇 |
机械仪表 | 17篇 |
建筑科学 | 100篇 |
矿业工程 | 24篇 |
能源动力 | 30篇 |
轻工业 | 267篇 |
水利工程 | 9篇 |
石油天然气 | 96篇 |
武器工业 | 2篇 |
无线电 | 8篇 |
一般工业技术 | 24篇 |
冶金工业 | 68篇 |
原子能技术 | 1篇 |
自动化技术 | 34篇 |
出版年
2024年 | 3篇 |
2023年 | 12篇 |
2022年 | 20篇 |
2021年 | 49篇 |
2020年 | 48篇 |
2019年 | 32篇 |
2018年 | 23篇 |
2017年 | 18篇 |
2016年 | 28篇 |
2015年 | 45篇 |
2014年 | 77篇 |
2013年 | 72篇 |
2012年 | 93篇 |
2011年 | 101篇 |
2010年 | 86篇 |
2009年 | 80篇 |
2008年 | 75篇 |
2007年 | 89篇 |
2006年 | 109篇 |
2005年 | 85篇 |
2004年 | 84篇 |
2003年 | 53篇 |
2002年 | 53篇 |
2001年 | 54篇 |
2000年 | 46篇 |
1999年 | 44篇 |
1998年 | 29篇 |
1997年 | 23篇 |
1996年 | 19篇 |
1995年 | 9篇 |
1994年 | 10篇 |
1993年 | 8篇 |
1992年 | 6篇 |
1991年 | 2篇 |
1990年 | 6篇 |
1989年 | 6篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1975年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有1609条查询结果,搜索用时 281 毫秒
1.
Raquel Cano Jos L. Prez Liss Angarita Dvila ngel Ortega Yosselin Gmez Nereida Josefina Valero-Cedeo Heliana Parra Alexander Manzano Teresa Isabel Vliz Castro María P. Díaz Albornoz Gabriel Cano Joselyn Rojas-Quintero Maricarmen Chacín Valmore Bermúdez 《International journal of molecular sciences》2021,22(9)
Non-alcoholic fatty liver disease (NAFLD) is considered the most common liver disorder, affecting around 25% of the population worldwide. It is a complex disease spectrum, closely linked with other conditions such as obesity, insulin resistance, type 2 diabetes mellitus, and metabolic syndrome, which may increase liver-related mortality. In light of this, numerous efforts have been carried out in recent years in order to clarify its pathogenesis and create new prevention strategies. Currently, the essential role of environmental pollutants in NAFLD development is recognized. Particularly, endocrine-disrupting chemicals (EDCs) have a notable influence. EDCs can be classified as natural (phytoestrogens, genistein, and coumestrol) or synthetic, and the latter ones can be further subdivided into industrial (dioxins, polychlorinated biphenyls, and alkylphenols), agricultural (pesticides, insecticides, herbicides, and fungicides), residential (phthalates, polybrominated biphenyls, and bisphenol A), and pharmaceutical (parabens). Several experimental models have proposed a mechanism involving this group of substances with the disruption of hepatic metabolism, which promotes NAFLD. These include an imbalance between lipid influx/efflux in the liver, mitochondrial dysfunction, liver inflammation, and epigenetic reprogramming. It can be concluded that exposure to EDCs might play a crucial role in NAFLD initiation and evolution. However, further investigations supporting these effects in humans are required. 相似文献
2.
Kechang Xie 《中国化学工程学报》2021,35(7):62-69
It is important to develop the advanced coal to chemicals industry (ACCI) against a backdrop of coal-based energy structures,excessive imported oil and natural gas,and strict environmental con-straints in China.In this study,the technology and industry of China's ACCI are reviewed to explain the effect of using coal to replace oil and natural gas,and the corresponding resource and environmental burdens that this will create.Development trends in technology and industry are also proposed to explore future scenarios.The review shows that although excellent progress has been made on an indus-trial scale,demonstrative level,and in terms of technology and equipment,the lack of strategic under-standing,severe external constraints,partly underdeveloped technologies,and weak foundations must be immediately addressed.Therefore,it is necessary to clarify the importance that the ACCI has on the energy revolution and energy system.Based on technological innovation,a variety of external factors should be considered as a whole with emphasis on filling the knowledge gap of theoretical foundations and industry standards to support high-quality development for ACCI. 相似文献
3.
4.
5.
文章从精细化学品化学课程特点入手,结合学校周边精细化工产业的实际情况,对精细化学品化学课程教学改革进行探索和尝试。对教材和课程教学内容进行"精简化"和"多样化"相结合的改革,使其更好地与培养"应用型人才"的教学目的以及学生的学习期望相匹配。 相似文献
6.
精细化学品化学是应用化学、化学工程与工艺专业的重要必修课程,此课程理论知识涵盖范围广,教师的授课任务重,学生的学习兴趣低。针对上述问题在教学中引入案例教学,不仅激发了学生的学习兴趣,而且培养了学生的创新精神和创新能力,提高了教学质量。 相似文献
7.
8.
9.
10.
苯乙烯是一种极易自聚的物质,不加以控制会导致温度持续上升甚至引发储罐爆炸。苯乙烯为可疑致癌物,具刺激性。一旦发生事故,对环境具有严重的危害。本文根据苯乙烯的特性,从设备选型、工艺流程、安全检测等方面对苯乙烯储罐的安全设计进行分析和讨论。 相似文献