全文获取类型
收费全文 | 141684篇 |
免费 | 12975篇 |
国内免费 | 7185篇 |
专业分类
电工技术 | 9120篇 |
技术理论 | 7篇 |
综合类 | 10401篇 |
化学工业 | 22093篇 |
金属工艺 | 8822篇 |
机械仪表 | 9515篇 |
建筑科学 | 11375篇 |
矿业工程 | 4975篇 |
能源动力 | 4096篇 |
轻工业 | 8771篇 |
水利工程 | 2816篇 |
石油天然气 | 8672篇 |
武器工业 | 1311篇 |
无线电 | 16138篇 |
一般工业技术 | 15800篇 |
冶金工业 | 6652篇 |
原子能技术 | 1663篇 |
自动化技术 | 19617篇 |
出版年
2024年 | 268篇 |
2023年 | 1998篇 |
2022年 | 3574篇 |
2021年 | 5466篇 |
2020年 | 4254篇 |
2019年 | 3537篇 |
2018年 | 3973篇 |
2017年 | 4488篇 |
2016年 | 4093篇 |
2015年 | 5902篇 |
2014年 | 7288篇 |
2013年 | 8619篇 |
2012年 | 9584篇 |
2011年 | 10359篇 |
2010年 | 9560篇 |
2009年 | 9146篇 |
2008年 | 8847篇 |
2007年 | 8639篇 |
2006年 | 8181篇 |
2005年 | 7035篇 |
2004年 | 4907篇 |
2003年 | 4519篇 |
2002年 | 4677篇 |
2001年 | 3989篇 |
2000年 | 3208篇 |
1999年 | 3212篇 |
1998年 | 2255篇 |
1997年 | 1970篇 |
1996年 | 1895篇 |
1995年 | 1511篇 |
1994年 | 1178篇 |
1993年 | 864篇 |
1992年 | 666篇 |
1991年 | 513篇 |
1990年 | 403篇 |
1989年 | 337篇 |
1988年 | 285篇 |
1987年 | 164篇 |
1986年 | 139篇 |
1985年 | 67篇 |
1984年 | 58篇 |
1983年 | 36篇 |
1982年 | 45篇 |
1981年 | 26篇 |
1980年 | 39篇 |
1979年 | 12篇 |
1978年 | 10篇 |
1977年 | 7篇 |
1976年 | 7篇 |
1951年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Xiuyun Guo Junjun Wu Xiangren Meng Yawei Zhang Zengqi Peng 《International Journal of Food Science & Technology》2022,57(4):2556-2567
This study investigated the effects of l -lysine (Lys) and l -histidine (His) on the oxidative characteristics and gel properties of porcine myofibrillar proteins (MP). Results showed that Lys and His had a strong ferrous ion-chelating ability and hydroxyl radical-scavenging activity. Moreover, Lys and His inhibited the protein carbonyl formation and MP aggregation at 0.2 M and 0.6 M NaCl, respectively, in a dose-dependent manner. Furthermore, 2 and 4 mg mL−1 Lys and His decreased the oxidation-induced loss of the tertiary structure of MP accompanied by the lower surface hydrophobicity. The water-holding capacity and gel strength of MP gels increased with increasing Lys and His concentrations due to more regular and lamellar structures with smaller and homogeneous pores at 0.6 M NaCl and more orderly crosslinking via fibrous filament at 0.2 M NaCl. In summary, Lys and His chelated the ferrous ions and scavenged hydroxyl radicals, decreased the oxidation-induced physicochemical changes, thus preventing oxidative damage during the formation of a three-dimensional gel network, which resulted in better gel quality. 相似文献
52.
Ding Haomiao Zhang Yuzhe Zha Yue Zhou Sijia Cao Chaoqing Zhu Huajian Xu Feng Zhang Xiuqiang Wang Caisheng 《Food science and biotechnology》2022,31(13):1741-1751
Food Science and Biotechnology - The cytoprotective and potential molecular mechanisms of Hylocereus polyrhizus protein (RFPP) were investigated on the hydrogen peroxide (H2O2)-triggered damage in... 相似文献
53.
Ligang Yu Yong Li Yukun Yang Caixia Guo Meiping Li 《International Journal of Food Science & Technology》2022,57(7):4646-4655
This study investigated the inhibitory effects of curcumin and piperine on fluorescent advanced glycation end products (fAGEs) formation in a bovine serum albumin (BSA)–fructose model. Model systems of BSA and fructose were prepared, and curcumin or piperine was added. fAGEs and BSA oxidation product (dityrosine, kynurenine and N'-formylkynurenine) contents were determined. The results showed that fAGEs content decreased with increasing concentration of curcumin and piperine (P < 0.05). Addition of curcumin and piperine at 160 µg mL−1 could inhibit fluorescent AGEs by 100% and 93% respectively. Dityrosine and N'-formylkynurenine contents decreased as curcumin and piperine concentration increased (P < 0.05). Furthermore, the result of principal component analysis indicated that curcumin and piperine markedly impeded BSA oxidation, resulting in a lower level of fAGEs in model systems. Therefore, adding curcumin and piperine may facilitate reduced fAGEs levels in BSA–fructose model. 相似文献
54.
Feng Wenran Li Zhen Chen Yingying Chen Jinyang Lang Haoze Wan Jianghong Gao Yan Dong Haitao 《Journal of Materials Science》2022,57(3):1881-1889
Journal of Materials Science - Although chalcogenide materials continue to generate considerable interest due to great potentials for various optoelectronic devices, annealing for a long time in... 相似文献
56.
Catalysis Letters - To explore the possibility of coreaction of selective catalytic reduction with NH3 (NH3-SCR) and CO oxidation (CO-O), bimetallic doping catalysts of Mn and Cu were synthesized... 相似文献
57.
International Journal of Information Security - With the widespread application of blockchain technology, the cyberspace security issue of phishing has also appeared in the emerging blockchain... 相似文献
58.
60.
Feng Yingrui Hu Kang Zhang Min Ding Wei Kong Xiangkai Sheng Zhigao Liu Qiangchun 《Journal of Materials Science》2022,57(1):204-216
Journal of Materials Science - Rationally designing microwave absorption materials with highly efficient and tunable bandwidth is in great demand but remains a huge challenge. In this study,... 相似文献