全文获取类型
收费全文 | 13572篇 |
免费 | 1129篇 |
国内免费 | 520篇 |
专业分类
电工技术 | 766篇 |
技术理论 | 1篇 |
综合类 | 891篇 |
化学工业 | 2310篇 |
金属工艺 | 987篇 |
机械仪表 | 885篇 |
建筑科学 | 935篇 |
矿业工程 | 319篇 |
能源动力 | 367篇 |
轻工业 | 897篇 |
水利工程 | 252篇 |
石油天然气 | 1020篇 |
武器工业 | 90篇 |
无线电 | 1328篇 |
一般工业技术 | 1625篇 |
冶金工业 | 759篇 |
原子能技术 | 164篇 |
自动化技术 | 1625篇 |
出版年
2024年 | 52篇 |
2023年 | 223篇 |
2022年 | 322篇 |
2021年 | 538篇 |
2020年 | 392篇 |
2019年 | 349篇 |
2018年 | 406篇 |
2017年 | 444篇 |
2016年 | 408篇 |
2015年 | 526篇 |
2014年 | 649篇 |
2013年 | 824篇 |
2012年 | 820篇 |
2011年 | 970篇 |
2010年 | 836篇 |
2009年 | 810篇 |
2008年 | 812篇 |
2007年 | 769篇 |
2006年 | 719篇 |
2005年 | 645篇 |
2004年 | 412篇 |
2003年 | 335篇 |
2002年 | 375篇 |
2001年 | 330篇 |
2000年 | 336篇 |
1999年 | 383篇 |
1998年 | 300篇 |
1997年 | 268篇 |
1996年 | 215篇 |
1995年 | 178篇 |
1994年 | 131篇 |
1993年 | 117篇 |
1992年 | 85篇 |
1991年 | 58篇 |
1990年 | 49篇 |
1989年 | 45篇 |
1988年 | 26篇 |
1987年 | 16篇 |
1986年 | 15篇 |
1985年 | 6篇 |
1984年 | 7篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1959年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 187 毫秒
1.
Peng Wang Yan Li Yujiao Qu Baowei Wang Jingxin Sun Chunwei Miao Ming Huang He Huang Congxiang Zhang 《International Journal of Food Science & Technology》2022,57(6):3428-3439
The effects of cellulose microfibres (CMFs, Average size: 100 ± 5 μm) and cellulose nanofibres (CNFs, Average size: 60 ± 3 nm) on the properties of myofibrillar protein (MP) gels from duck breast meat were studied. The results demonstrated that CMFs and CNFs were mostly connected to MP by non-covalent bonds, the diffusion and cross-linking of MP molecules was promoted, and a denser and more complete gel network was formed. With the increases of CMFs and CNFs concentration (0–10%), the hardness was increased by 13.15% and 19.78% for CMFs10% and CNFs10% gels, respectively, and the elasticity was increased by 40% and 80%, respectively. At the same concentration (0–10%), the increase in gel hardness, viscoelasticity and immobilised water content was greater in the CNFs-MP group than in the CMFs-MP group. The CNFs-MP group had a tighter gel network, and CNFs had a better potential to improve the gelation performance of MP. 相似文献
2.
Fine-grained few-shot learning is a difficult task in image classification. The reason is that the discriminative
features of fine-grained images are often located in local areas of the image, while most of the existing few-shotlearning image classification methods only use top-level features and adopt a single measure. In that way, the localfeatures of the sample cannot be learned well. In response to this problem, ensemble relation network with multi-level measure (ERN-MM) is proposed in this paper. It adds the relation modules in the shallow feature space tocompare the similarity between the samples in the local features, and finally integrates the similarity scores from thefeature spaces to assign the label of the query samples. So the proposed method ERN-MM can use local details andglobal information of different grains. Experimental results on different fine-grained datasets show that the proposedmethod achieves good classification performance and also proves its rationality. 相似文献
3.
介绍装配式建筑电气设计中的管线分离SI体系、模块化机电设计、集成机电部品、装配式建筑防雷接地系统等关键技术,并进行简要分析. 相似文献
4.
Chunyan Xu Ying Wang Daodong Pan Changyu Zhou Jun He Jinxuan Cao 《International Journal of Food Science & Technology》2021,56(4):1690-1702
To investigate the effect of cooking temperature (55, 65, 75, 85 and 95 °C) on texture and flavour binding of braised sauce porcine skin (BSPS), sensory acceptance, microstructure and flavour-binding capacity were investigated during the processing of BSPS. Samples cooked at 85 and 95 °C showed better texture and aroma scores. Hardness and chewiness of BSPS were obviously improved at 85 and 95 °C than control group. Collagen structure was significantly destroyed over 85 °C. The porcine skin collagen heated at 85 and 95 °C showed relatively higher flavour-binding capacity than other samples. The improvement of texture of BSPS was mainly attributed to the degradation of collagen. Higher aroma scores of BSPS were related to intense binding abilities with aroma compounds at 85 and 95 °C. Cooking at 85 or 95 °C could be an optimal cooking temperature for BSPS. 相似文献
5.
6.
Fluorescence‐Activated Cell Sorters: Standing Surface Acoustic Wave (SSAW)‐Based Fluorescence‐Activated Cell Sorter (Small 40/2018) 下载免费PDF全文
7.
反应堆屏蔽计算中经常出现厚屏蔽、小探测器问题,常规蒙特卡罗方法难以有效解决。基于自动重要抽样(AIS)方法,本文提出了小探测器自动重要抽样(SDAIS)方法,并针对小探测器问题,优化了AIS方法的虚粒子赌分裂算法。该方法在自主开发的蒙特卡罗屏蔽程序MCShield上进行了实现。使用NUREG/CR-6115 PWR基准题验证该方法的正确性和计算效率。结果表明,SDAIS方法可有效地解决厚屏蔽小探测器问题,相比AIS方法及传统的重要性方法,计算效率提升1~2个量级。 相似文献
8.
9.
10.