全文获取类型
收费全文 | 6892篇 |
免费 | 415篇 |
国内免费 | 6篇 |
专业分类
电工技术 | 98篇 |
综合类 | 28篇 |
化学工业 | 1946篇 |
金属工艺 | 185篇 |
机械仪表 | 152篇 |
建筑科学 | 416篇 |
矿业工程 | 39篇 |
能源动力 | 243篇 |
轻工业 | 464篇 |
水利工程 | 42篇 |
石油天然气 | 5篇 |
无线电 | 602篇 |
一般工业技术 | 1476篇 |
冶金工业 | 278篇 |
原子能技术 | 38篇 |
自动化技术 | 1301篇 |
出版年
2024年 | 14篇 |
2023年 | 101篇 |
2022年 | 152篇 |
2021年 | 268篇 |
2020年 | 187篇 |
2019年 | 191篇 |
2018年 | 191篇 |
2017年 | 187篇 |
2016年 | 282篇 |
2015年 | 299篇 |
2014年 | 349篇 |
2013年 | 505篇 |
2012年 | 472篇 |
2011年 | 626篇 |
2010年 | 411篇 |
2009年 | 417篇 |
2008年 | 402篇 |
2007年 | 354篇 |
2006年 | 275篇 |
2005年 | 246篇 |
2004年 | 189篇 |
2003年 | 149篇 |
2002年 | 149篇 |
2001年 | 73篇 |
2000年 | 100篇 |
1999年 | 92篇 |
1998年 | 83篇 |
1997年 | 81篇 |
1996年 | 86篇 |
1995年 | 55篇 |
1994年 | 46篇 |
1993年 | 48篇 |
1992年 | 46篇 |
1991年 | 33篇 |
1990年 | 20篇 |
1989年 | 12篇 |
1988年 | 16篇 |
1987年 | 16篇 |
1986年 | 12篇 |
1985年 | 13篇 |
1984年 | 8篇 |
1983年 | 7篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1980年 | 9篇 |
1976年 | 3篇 |
1975年 | 4篇 |
1972年 | 4篇 |
1959年 | 2篇 |
1954年 | 3篇 |
排序方式: 共有7313条查询结果,搜索用时 0 毫秒
11.
12.
13.
14.
Luca Pietrobon Lorenzo Fallarino Andreas Berger Andrey Chuvilin Flix Casanova Luis E. Hueso 《Small (Weinheim an der Bergstrasse, Germany)》2015,11(47):6295-6301
Graphene has been predicted to develop a magnetic moment by proximity effect when placed on a ferromagnetic film, a promise that could open exciting possibilities in the fields of spintronics and magnetic data recording. In this work, the interplay between the magnetoresistance of graphene and the magnetization of an underlying ferromagnetic insulating film is studied in detail. A clear correlation between both magnitudes is observed but through a careful modeling of the magnetization and the weak localization measurements, that such correspondence can be explained by the effects of the magnetic stray fields arising from the ferromagnetic insulator is found. The results emphasize the complexity arising at the interface between magnetic and 2D materials. 相似文献
15.
Raffael Ott Xenia Pawlow Andreas Weiß Anna Hofelich Melanie Herbst Nadine Hummel Cornelia Prehn Jerzy Adamski Werner Rmisch-Margl Gabi Kastenmüller Anette-G. Ziegler Sandra Hummel 《International journal of molecular sciences》2020,21(24)
Shared metabolomic patterns at delivery have been suggested to underlie the mother-to-child transmission of adverse metabolic health. This study aimed to investigate whether mothers with gestational diabetes mellitus (GDM) and their offspring show similar metabolomic patterns several years postpartum. Targeted metabolomics (including 137 metabolites) was performed in plasma samples obtained during an oral glucose tolerance test from 48 mothers with GDM and their offspring at a cross-sectional study visit 8 years after delivery. Partial Pearson’s correlations between the area under the curve (AUC) of maternal and offspring metabolites were calculated, yielding so-called Gaussian graphical models. Spearman’s correlations were applied to investigate correlations of body mass index (BMI), Matsuda insulin sensitivity index (ISI-M), dietary intake, and physical activity between generations, and correlations of metabolite AUCs with lifestyle variables. This study revealed that BMI, ISI-M, and the AUC of six metabolites (carnitine, taurine, proline, SM(-OH) C14:1, creatinine, and PC ae C34:3) were significantly correlated between mothers and offspring several years postpartum. Intergenerational metabolite correlations were independent of shared BMI, ISI-M, age, sex, and all other metabolites. Furthermore, creatinine was correlated with physical activity in mothers. This study suggests that there is long-term metabolic programming in the offspring of mothers with GDM and informs us about targets that could be addressed by future intervention studies. 相似文献
16.
17.
18.
19.
20.