全文获取类型
收费全文 | 850篇 |
免费 | 37篇 |
国内免费 | 27篇 |
专业分类
电工技术 | 55篇 |
综合类 | 28篇 |
化学工业 | 64篇 |
金属工艺 | 23篇 |
机械仪表 | 48篇 |
建筑科学 | 24篇 |
矿业工程 | 10篇 |
能源动力 | 13篇 |
轻工业 | 63篇 |
水利工程 | 13篇 |
石油天然气 | 457篇 |
武器工业 | 2篇 |
无线电 | 20篇 |
一般工业技术 | 26篇 |
冶金工业 | 11篇 |
原子能技术 | 1篇 |
自动化技术 | 56篇 |
出版年
2024年 | 1篇 |
2023年 | 5篇 |
2022年 | 12篇 |
2021年 | 19篇 |
2020年 | 18篇 |
2019年 | 18篇 |
2018年 | 14篇 |
2017年 | 14篇 |
2016年 | 9篇 |
2015年 | 14篇 |
2014年 | 29篇 |
2013年 | 24篇 |
2012年 | 22篇 |
2011年 | 102篇 |
2010年 | 45篇 |
2009年 | 28篇 |
2008年 | 53篇 |
2007年 | 48篇 |
2006年 | 59篇 |
2005年 | 71篇 |
2004年 | 63篇 |
2003年 | 49篇 |
2002年 | 54篇 |
2001年 | 29篇 |
2000年 | 10篇 |
1999年 | 15篇 |
1998年 | 21篇 |
1997年 | 11篇 |
1996年 | 12篇 |
1995年 | 10篇 |
1994年 | 12篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1991年 | 5篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1983年 | 1篇 |
1980年 | 2篇 |
排序方式: 共有914条查询结果,搜索用时 31 毫秒
911.
Mingmei Gao Dongying Wei Siqi Chen Bohe Qin Dr. Yueyao Wang Prof. Dr. Zhe Li Prof. Dr. Hanyang Yu 《Chembiochem : a European journal of chemical biology》2023,24(4):e202200651
Catalytic DNA-based fluorescent sensors have enabled cellular imaging of metal ions such as Mg2+. However, natural DNA is prone to nuclease-mediated degradation. Here, we report the in vitro selection of threose nucleic acid enzymes (TNAzymes) with RNA endonuclease activities. One such TNAzyme, T17–22, catalyzes a site-specific RNA cleavage reaction with a kcat of 0.017 min−1 and KM of 675 nM. A fluorescent sensor based on T17–22 responds to an increasing concentration of Mg2+ with a limit of detection at 0.35 mM. This TNAzyme-based sensor also allows cellular imaging of Mg2+. This work presents the first proof-of-concept demonstration of using a TNA catalyst in cellular metal ion imaging. 相似文献
912.
Haoduo Yang Ying Dong Dongying Wang Xuede Wang 《European Journal of Lipid Science and Technology》2023,125(1):2200099
The study aims to compare the differences in the oxidative stability, sensory properties, and volatile compounds during accelerated storage of pepper aromatized sunflower oil (PASO) samples prepared by maceration method (PASO-M), co-pressing method (PASO-C), and direct addition method (PASO-A), respectively. The results exhibit that their oxidative stability is in the relative order: PASO-A > PASO-C > PASO-M. Meanwhile, the PASO-A sample is the most preferable aromatized sunflower oil by consumers according to sensory analysis. In addition, a total of 83 volatile compounds are identified in the three PASO samples during the storage, and the principal component analysis (PCA) shows that their volatile compounds are quite different at the initial stage of the storage. Still, they are similar among each other from the middle of storage period. As consequence, the aromatized sunflower oil sample prepared by the direct-addition method during the storage possesses better oxidative stability and sensory attributes, and there is not much difference among their volatile compounds, indicating that the aromatized sunflower oil prepared by direct-addition method can be developed as promising aromatized sunflower oil. Practical applications: This study shows that aromatization increases oxidative stability and sensory properties of sunflower oil. By this way some sunflower oils with special sensory properties are obtained: special smell and taste, special color, etc. These peppers aromatized sunflower oils can be used to increase taste and smell in some dishes. For example, they can be used in some salads and some roast meats to give more taste and color. 相似文献
913.
运用排替压力法定量预测断层侧向封闭能力——以济阳坳陷为例 总被引:2,自引:2,他引:0
断层对油气的封闭作用主要体现在侧向封闭上,而断层岩的排替压力是评价断层侧向封闭的主要参数,泥质含量和埋深则是影响岩石排替压力的主要因素.断层岩的泥质含量或埋深越大,其排替压力越大,对油气的封堵能力越强.通过实验测试手段可以建立不同泥质含量断层岩的排替压力与埋深的关系,从而可以实现对断层岩排替压力的预测.断层岩与储层的排... 相似文献
914.