全文获取类型
收费全文 | 1506篇 |
免费 | 82篇 |
国内免费 | 12篇 |
专业分类
化学 | 1030篇 |
晶体学 | 10篇 |
力学 | 72篇 |
综合类 | 4篇 |
数学 | 225篇 |
物理学 | 259篇 |
出版年
2024年 | 3篇 |
2023年 | 10篇 |
2022年 | 57篇 |
2021年 | 64篇 |
2020年 | 37篇 |
2019年 | 48篇 |
2018年 | 59篇 |
2017年 | 44篇 |
2016年 | 84篇 |
2015年 | 72篇 |
2014年 | 67篇 |
2013年 | 158篇 |
2012年 | 99篇 |
2011年 | 110篇 |
2010年 | 95篇 |
2009年 | 79篇 |
2008年 | 80篇 |
2007年 | 74篇 |
2006年 | 47篇 |
2005年 | 47篇 |
2004年 | 43篇 |
2003年 | 28篇 |
2002年 | 19篇 |
2001年 | 11篇 |
2000年 | 10篇 |
1999年 | 4篇 |
1998年 | 12篇 |
1996年 | 12篇 |
1995年 | 4篇 |
1994年 | 3篇 |
1993年 | 5篇 |
1992年 | 5篇 |
1991年 | 4篇 |
1990年 | 11篇 |
1988年 | 3篇 |
1987年 | 5篇 |
1986年 | 6篇 |
1985年 | 7篇 |
1984年 | 8篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1979年 | 7篇 |
1978年 | 5篇 |
1977年 | 6篇 |
1976年 | 11篇 |
1975年 | 7篇 |
1974年 | 4篇 |
1973年 | 3篇 |
1972年 | 3篇 |
排序方式: 共有1600条查询结果,搜索用时 15 毫秒
51.
Rafiq Shahid Abbas Zaheer Nawaz Muhammad Alharbi Sayer Obaid 《Journal of Thermal Analysis and Calorimetry》2021,145(6):3269-3279
Journal of Thermal Analysis and Calorimetry - A numerical model is developed to study the effects of temperature-dependent viscosity on heat transfer in magnetohydrodynamic flow of micropolar fluid... 相似文献
52.
Abbas S. Imtiaz-ud-Din Mehmood M. Raheel A. Ayub R. Zahid M. Tahir M. N. 《Russian Journal of Coordination Chemistry》2021,47(12):891-902
Russian Journal of Coordination Chemistry - A series of ferrocenyl substituted hydrazones (I–VII) derived from ferrocene carboxaldehyde and substituted hydrazides have been prepared and... 相似文献
53.
54.
Dr. Mahnaz Najafi Dr. Sara Abednatanzi Abbas Yousefi Prof. Mehrorang Ghaedi 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(72):17999-18014
Photocatalysis has been known as one of the promising technologies due to its eco-friendly nature. However, the potential application of many photocatalysts is limited owing to their large bandgaps and inefficient use of the solar spectrum. One strategy to overcome this problem is to combine the advantages of heteroatom-containing supports with active metal centers to accurately adjust the structural parameters. Metal nanoparticles (MNPs) and single atom catalysts (SACs) are excellent candidates due to their distinctive coordination environment which enhances photocatalytic activity. Metal-organic frameworks (MOFs), covalent organic frameworks (COFs) and carbon nitride (g-C3N4) have shown great potential as catalyst support for SACs and MNPs. The numerous combinations of organic linkers with various heteroatoms and metal ions provide unique structural characteristics to achieve advanced materials. This review describes the recent advancement of the modified MOFs, COFs and g-C3N4 with SACs and NPs for enhanced photocatalytic applications with emphasis on environmental remediation. 相似文献
55.
Afaq Shagufta Khan Sadia Kazmi Mehdi Hassan Fatima Itrat Malik Abdul Inamullah Farah Farhad Zahid Abbas Tanveer Tareen Rasool Bakhsh 《Chemistry of Natural Compounds》2021,57(2):269-273
Chemistry of Natural Compounds - Armatans A (1) and B (2), new isoflavans, have been isolated from the EtOAc-soluble fraction of the MeOH extract of Colutea armata Hemsl. & Lace, along with... 相似文献
56.
Abasabadi Reza Khaleghi Khodadadi Abbas Ali Mortazavi Yadollah 《Research on Chemical Intermediates》2021,47(4):1429-1446
Research on Chemical Intermediates - The importance of electronic and chemical properties of nitrogen-doped reduced graphene oxide (NRGO) has attracted more attention in recent years. Various... 相似文献
57.
Dehkordi S. Saeid Saei Albadi Jalal Jafari Abbas Ali Samimi Heshmat Allah 《Research on Chemical Intermediates》2021,47(6):2527-2538
A copper-based magnetic nanocatalyst has been prepared by co-precipitation method and characterized by FESEM, EDS, TEM, XRD, XRF, ICP–OES, FTIR, and BET analysis. This new nanocatalyst displays a good activity toward the aerobic oxidation of a wide range of alcohols in water. Moreover, it is recyclable up to five following runs by simple filtration without any significant loss of its catalytic activity.
相似文献58.
Khizir Hersh Ahmed Abbas Tariq Abdul-Hameed 《Journal of Sol-Gel Science and Technology》2021,98(3):487-496
Journal of Sol-Gel Science and Technology - In this study, the hydrothermal method is used for growing and characterization of titanium dioxide (TiO2) nanorods on the fluorine-doped tin oxide (FTO)... 相似文献
59.
60.
In this paper, Bernstein operational matrix of fractional derivative of order α in the Caputo sense is derived. We also apply this matrix to the collocation method for solving multi-order fractional differential equations. The numerical results obtained by the present method compares favorably with those obtained by various collocation methods earlier in the literature. 相似文献