全文获取类型
收费全文 | 746924篇 |
免费 | 9676篇 |
国内免费 | 1928篇 |
专业分类
电工技术 | 13528篇 |
综合类 | 641篇 |
化学工业 | 116466篇 |
金属工艺 | 29452篇 |
机械仪表 | 23733篇 |
建筑科学 | 17549篇 |
矿业工程 | 4736篇 |
能源动力 | 19708篇 |
轻工业 | 64029篇 |
水利工程 | 8406篇 |
石油天然气 | 16559篇 |
武器工业 | 44篇 |
无线电 | 83789篇 |
一般工业技术 | 148660篇 |
冶金工业 | 130951篇 |
原子能技术 | 16877篇 |
自动化技术 | 63400篇 |
出版年
2021年 | 6703篇 |
2020年 | 5028篇 |
2019年 | 6414篇 |
2018年 | 10962篇 |
2017年 | 11157篇 |
2016年 | 11881篇 |
2015年 | 7586篇 |
2014年 | 12771篇 |
2013年 | 34877篇 |
2012年 | 20289篇 |
2011年 | 27850篇 |
2010年 | 22169篇 |
2009年 | 24662篇 |
2008年 | 25309篇 |
2007年 | 25012篇 |
2006年 | 22049篇 |
2005年 | 20023篇 |
2004年 | 19096篇 |
2003年 | 18700篇 |
2002年 | 17890篇 |
2001年 | 17787篇 |
2000年 | 16796篇 |
1999年 | 16990篇 |
1998年 | 39348篇 |
1997年 | 28253篇 |
1996年 | 21899篇 |
1995年 | 16791篇 |
1994年 | 15037篇 |
1993年 | 14738篇 |
1992年 | 11252篇 |
1991年 | 10767篇 |
1990年 | 10599篇 |
1989年 | 10235篇 |
1988年 | 9881篇 |
1987年 | 8682篇 |
1986年 | 8402篇 |
1985年 | 9747篇 |
1984年 | 8846篇 |
1983年 | 8377篇 |
1982年 | 7568篇 |
1981年 | 7713篇 |
1980年 | 7277篇 |
1979年 | 7312篇 |
1978年 | 7105篇 |
1977年 | 7898篇 |
1976年 | 9889篇 |
1975年 | 6330篇 |
1974年 | 6056篇 |
1973年 | 6187篇 |
1972年 | 5165篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Elli Ntakou Ralph Masiello Farnaz Farzan Shay Bahramirad Aleksi Paaso M.A. Nayeem Maigha Maigha Daniel Kushner 《The Electricity Journal》2019,32(4):45-49
This paper presents part of the work ComEd and Quanta Technology have performed to quantify the locational and temporal value of DER to avoid distribution grid upgrade investments. It focuses on the formulation of a robust and efficient algorithm for DER optimal dispatch on a distribution feeder to mitigate the violation of current and voltage limits using the allocated cost of capacity and locational marginal value of real and reactive DER injection/withdrawal. 相似文献
2.
3.
Ana Clara Sabbione Santiago Suárez María Cristina Añón Adriana Scilingo 《International Journal of Food Science & Technology》2019,54(5):1506-1513
In this study, amaranth flour was used as an ingredient to prepare gluten-free cookies. The production process and attributes of amaranth cookies were characterised, and the potential use of amaranth flour as a functional ingredient was analysed. Cookies exhibited a non-uniform reddish brown colour and a cookie factor ratio of 4.5 ± 0.6. Storage studies indicated that after 3 weeks at room temperature cookies presented slight variations in the texture. Simulated gastrointestinal digestion of this product was able to release peptides capable of exerting potential antithrombotic and antihypertensive activities, IC50 values of 0.22 ± 0.04 and 0.23 ± 0.03 mg mL−1 protein, respectively. This work demonstrates for the first time that food made with amaranth flour exerts potential antithrombotic and antihypertensive activity. In conclusion, these amaranth cookies could be an alternative way of incorporating potentially health beneficial products for people who choose a conscious diet, including coeliac or vegan consumers. 相似文献
4.
5.
6.
Norfariza Jamaluddin David C. Stuckey Arbakariya B. Ariff 《Critical reviews in food science and nutrition》2018,58(14):2453-2465
ABSTRACTBacteriocin is a proteinaceous biomolecule produced by bacteria (both Gram-positive and Gram-negative) that exhibits antimicrobial activity against closely related species, and food-borne pathogens. It has recently gained importance and attracted the attention of several researchers looking to produce it from various substrates and bacterial strains. This ushers in a new era of food preservation where the use of bacteriocin in food products will be an alternative to chemical preservatives, and heat treatment which are understood to cause unwanted side effects, and reduce sensory and nutritional quality. However, this new market depends on the success of novel downstream separation schemes from various types of crude feedstocks which are both effective and economic. This review focuses on the downstream separation of bacteriocin from various sources using both conventional and novel techniques. Finally, recommendations for future interesting areas of research that need to be pursued are highlighted. 相似文献
7.
8.
9.
10.