全文获取类型
收费全文 | 2399篇 |
免费 | 188篇 |
国内免费 | 60篇 |
专业分类
电工技术 | 74篇 |
综合类 | 105篇 |
化学工业 | 546篇 |
金属工艺 | 68篇 |
机械仪表 | 90篇 |
建筑科学 | 113篇 |
矿业工程 | 24篇 |
能源动力 | 72篇 |
轻工业 | 223篇 |
水利工程 | 30篇 |
石油天然气 | 38篇 |
武器工业 | 3篇 |
无线电 | 325篇 |
一般工业技术 | 384篇 |
冶金工业 | 144篇 |
原子能技术 | 12篇 |
自动化技术 | 396篇 |
出版年
2024年 | 3篇 |
2023年 | 57篇 |
2022年 | 106篇 |
2021年 | 178篇 |
2020年 | 98篇 |
2019年 | 85篇 |
2018年 | 112篇 |
2017年 | 80篇 |
2016年 | 157篇 |
2015年 | 99篇 |
2014年 | 78篇 |
2013年 | 131篇 |
2012年 | 111篇 |
2011年 | 117篇 |
2010年 | 88篇 |
2009年 | 90篇 |
2008年 | 96篇 |
2007年 | 82篇 |
2006年 | 86篇 |
2005年 | 57篇 |
2004年 | 56篇 |
2003年 | 89篇 |
2002年 | 137篇 |
2001年 | 84篇 |
2000年 | 77篇 |
1999年 | 46篇 |
1998年 | 48篇 |
1997年 | 32篇 |
1996年 | 22篇 |
1995年 | 23篇 |
1994年 | 10篇 |
1993年 | 13篇 |
1992年 | 9篇 |
1991年 | 6篇 |
1990年 | 10篇 |
1989年 | 5篇 |
1988年 | 5篇 |
1986年 | 7篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1983年 | 5篇 |
1982年 | 8篇 |
1981年 | 9篇 |
1980年 | 6篇 |
1978年 | 7篇 |
1977年 | 3篇 |
1976年 | 6篇 |
1975年 | 3篇 |
1971年 | 1篇 |
1969年 | 1篇 |
排序方式: 共有2647条查询结果,搜索用时 15 毫秒
101.
Yan Li Thi Thanh Hanh Nguyen Juhui Jin Juho Lim Jiyeon Lee Meizi Piao Il-Kyoon Mok Doman Kim 《Food science and biotechnology》2021,30(4):555
Co-fermentation using yeast (Saccharomyces cerevisiae and Pichia kudriavzevii) and the bacteria (Lactobacillus plantarum) as starters isolated from spontaneous sourdough was conducted for the brewing of glucuronic acid (GlcA)-enriched apple cider. The concentration of GlcA in the apple cider co-fermented for 14 d with commercial S. cerevisiae and L. plantarum was 37.7 ± 1.7 mg/mL while a concentration of 62.8 ± 3.1 mg/mL was recorded for fermentation with P. kudriavzevii and L. plantarum, which was higher than the corresponding single yeast fermentation. The co-fermented apple cider revealed higher 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity of 171.67 ± 0.79 µg trolox equivalents (TE)/mL using P. kudriavzevii and L. plantarum, compared to the control (143.89 ± 7.07 µg TE/mL) just using S. cerevisiae. Thus, the co-fermentation of S. cerevisiae and L. plantarum and P. kudriavzevii and L. plantarum provided a new strategy for the development of GlcA-enriched apple cider with enhanced antioxidant capacity. 相似文献
102.
103.
104.
Vinoth Kumar Rethineswaran Da Yeon Kim Yeon-Ju Kim WoongBi Jang Seung Taek Ji Le Thi Hong Van Ly Thanh Truong Giang Jong Seong Ha Jisoo Yun Jinsup Jung Sang-Mo Kwon 《International journal of molecular sciences》2021,22(9)
Endothelial progenitor cells (EPCs) are specialized cells in circulating blood, well known for their ability to form new vascular structures. Aging and various ailments such as diabetes, atherosclerosis and cardiovascular disease make EPCs vulnerable to decreasing in number, which affects their migration, proliferation and angiogenesis. Myocardial ischemia is also linked to a reduced number of EPCs and their endothelial functional role, which hinders proper blood circulation to the myocardium. The current study shows that an aminopyrimidine derivative compound (CHIR99021) induces the inhibition of GSK-3β in cultured late EPCs. GSK-3β inhibition subsequently inhibits mTOR by blocking the phosphorylation of TSC2 and lysosomal localization of mTOR. Furthermore, suppression of GSK-3β activity considerably increased lysosomal activation and autophagy. The activation of lysosomes and autophagy by GSK-3β inhibition not only prevented replicative senescence of the late EPCs but also directed their migration, proliferation and angiogenesis. To conclude, our results demonstrate that lysosome activation and autophagy play a crucial role in blocking the replicative senescence of EPCs and in increasing their endothelial function. Thus, the findings provide an insight towards the treatment of ischemia-associated cardiovascular diseases based on the role of late EPCs. 相似文献
105.
106.
107.
108.
Nonthermal plasma for pesticide and microbial elimination on fruits and vegetables: an overview
下载免费PDF全文
![点击此处可从《International Journal of Food Science & Technology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Khanh Thi Kim Phan Huan Tai Phan Charles S. Brennan Yuthana Phimolsiripol 《International Journal of Food Science & Technology》2017,52(10):2127-2137
Nonthermal plasma (NTP) is defined in terms of partly ionised gas which overall temperature is quite low because the stored energy is mostly in free electrons. Applications of NTP have been expanded to new areas of food applications such as the microbial inactivation and also the elimination of pesticide and toxic chemical residues in food such as fruits and vegetables while nutritional content and key characteristics are still preserved. Plasma treatment has successfully decreased the concentrations of pesticides by about 45‐71%. In this article, NTP technologies as well as investigations about applying of NTP for removing pesticide residues and improving microbial safety in fresh produce are described. Potential applications of NTP in food processing together with some of their challenges and limitations are also discussed. 相似文献
109.
110.
Minh Truong Xuan Nguyen Minh-Kha Nguyen Phuong Thi Thuy Pham Ha Ky Phuong Huynh Son Truong Nguyen 《International Journal of Hydrogen Energy》2021,46(5):3909-3921
One-dimensional (1D) metal-coated Pd structures are efficient catalysts for the ethanol electro-oxidation and promising strategy for minimizing the Pd-loading toward commercialization of direct ethanol fuel cells (DEFCs). Herein, the decorated and core-shell architectures of a novel Pd coating on Ag nanowires (PdAg-NWs) are controllable by a two-step polyol method based on the galvanic replacement reaction. The integration of uniform shell with a low Pd concentration and partial hollow structure onto 1D PdAg-NWs exhibits the highest efficiency for ethanol oxidation reaction (EOR) in alkaline solution. In comparison with Pd nanoparticles (PdNPs/C), the PdAgNWs/C performes 11 times superior EOR activity, and the onset potential shifts 80 mV negatively. The presence of Ag in PdAg-NWs enhances the absorption capacity of ethanol molecules and hydroxyl ions on the active sites, and improves the catalyst tolerance to CO-like intermediates, making them a potential anodic catalyst for DEFCs. 相似文献