全文获取类型
收费全文 | 98743篇 |
免费 | 9405篇 |
国内免费 | 4913篇 |
专业分类
电工技术 | 5894篇 |
技术理论 | 5篇 |
综合类 | 7220篇 |
化学工业 | 16275篇 |
金属工艺 | 5773篇 |
机械仪表 | 6390篇 |
建筑科学 | 7335篇 |
矿业工程 | 3407篇 |
能源动力 | 2793篇 |
轻工业 | 6691篇 |
水利工程 | 1794篇 |
石油天然气 | 5396篇 |
武器工业 | 819篇 |
无线电 | 11725篇 |
一般工业技术 | 11941篇 |
冶金工业 | 4648篇 |
原子能技术 | 1082篇 |
自动化技术 | 13873篇 |
出版年
2024年 | 390篇 |
2023年 | 1602篇 |
2022年 | 2652篇 |
2021年 | 3936篇 |
2020年 | 2980篇 |
2019年 | 2681篇 |
2018年 | 2925篇 |
2017年 | 3193篇 |
2016年 | 2956篇 |
2015年 | 3922篇 |
2014年 | 4820篇 |
2013年 | 5871篇 |
2012年 | 6445篇 |
2011年 | 6828篇 |
2010年 | 5960篇 |
2009年 | 5591篇 |
2008年 | 5446篇 |
2007年 | 5194篇 |
2006年 | 5538篇 |
2005年 | 4662篇 |
2004年 | 3372篇 |
2003年 | 3287篇 |
2002年 | 3573篇 |
2001年 | 3164篇 |
2000年 | 2627篇 |
1999年 | 2530篇 |
1998年 | 2042篇 |
1997年 | 1698篇 |
1996年 | 1505篇 |
1995年 | 1286篇 |
1994年 | 1091篇 |
1993年 | 732篇 |
1992年 | 581篇 |
1991年 | 499篇 |
1990年 | 340篇 |
1989年 | 283篇 |
1988年 | 236篇 |
1987年 | 142篇 |
1986年 | 118篇 |
1985年 | 76篇 |
1984年 | 38篇 |
1983年 | 21篇 |
1982年 | 42篇 |
1981年 | 25篇 |
1980年 | 43篇 |
1979年 | 19篇 |
1978年 | 12篇 |
1977年 | 11篇 |
1976年 | 18篇 |
1975年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
31.
Effects of different carbon sources and C/N values on nonvolatile taste components of Pleurotus eryngii
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)
Wen Li Xiaobei Li Yan Yang Feng Zhou Yanfang Liu Shuai Zhou Hailong Yu 《International Journal of Food Science & Technology》2015,50(11):2360-2366
Pleurotus eryngii, the second largest industrial cultivation mushroom in China, is usually cultivated on substrates mainly consisting of sawdust and corncob. In this study, experiments were performed to determine the effects of different carbon sources and C/N values on nonvolatile taste components of P. eryngii. The effects of different carbon sources on nonvolatile taste components levels revealed that sawdust was beneficial to high levels of crude protein, amino acids, 5′‐nucleotides and equivalent umami concentration, while corncob was beneficial to high contents of carbohydrate, polysaccharides and trehalose. At the similar C/N values, relatively higher sawdust content was beneficial to umami amino acid production, while relatively higher corncob content was beneficial to high contents of carbohydrate, polysaccharides and mannitol. Higher C/N value was beneficial to high levels of crude protein, amino acids, 5′‐nucleotides and equivalent umami concentration, while lower C/N value was beneficial to high contents of carbohydrate, polysaccharides and trehalose. These results provided information for P. eryngii fruit body industrial cultivation to obtain specific nonvolatile taste components with high levels. 相似文献
32.
Thermoresponsive behavior and rheology of SiO2–hyaluronic acid/poly(N‐isopropylacrylamide) (NaHA/PNIPAm) core–shell structured microparticles
下载免费PDF全文
![点击此处可从《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
33.
34.
35.
36.
37.
Xiaohui Hu Li Cheng Yan Hong Zhaofeng Li Caiming Li Zhengbiao Gu 《International Journal of Food Science & Technology》2021,56(8):4149-4158
Incorporating high level of potato flour into wheat flour enhances nutritional values of bread but induces a series of problems that lead to the decline of the bread quality. To overcome the barrier, wheat gluten and carboxymethylcellulose (CMC) were added into potato–wheat composite flour to improve dough machinability and bread quality. The rheological properties, thermo-mechanical properties and microstructures of dough were investigated. The results showed that the interaction between gluten and CMC mitigated the discontinuity of gluten matrix and gluten protein aggregation caused by the addition of potato flour, which yielded a more branched and compact gluten network. The compact three-dimensional viscoelastic structure induced improvements of gas retention capacity and dough stability, making it mimic the machinability properties of wheat flour dough. Bread qualities were apparently improved with the combined use of 4% gluten and 6% CMC, of which specific volume increased by 42.86%, and simultaneously, hardness reduced by 75.93%. 相似文献
38.
39.
40.
Yu-Jiao Liu Xiao-Yang Fan Dr. Dong-Dong Zhang Yin-Zheng Xia Dr. Yan-Jun Hu Feng-Lei Jiang Prof. Fu-Ling Zhou Prof. Yi Liu 《ChemMedChem》2020,15(6):552-558
Based on the potential therapeutic value in targeting mitochondria and the fluorophore tracing ability, a fluorescent mitochondria-targeted organic arsenical PDT-PAO-F16 was fabricated, which not only visualized the cellular distribution, but also exerted anti-cancer activity in vitro and in vivo via targeting pyruvate dehydrogenase complex (PDHC) and respiratory chain complexes in mitochondria. In details, PDT-PAO-F16 mainly accumulated into mitochondria within hours and suppressed the activity of PDHC resulting in the inhibition of ATP synthesis and thermogenesis disorder. Moreover, the suppression of respiratory chain complex I and IV accelerated the mitochondrial dysfunction leading to caspase family-dependent apoptosis. In vivo, the acute promyelocytic leukemia was greatly alleviated in the PDT-PAO-F16 treated group in APL mice model. Our results demonstrated the organic arsenical precursor with fluorescence imaging and target-anticancer efficacy is a promising anticancer drug. 相似文献