全文获取类型
收费全文 | 1647篇 |
免费 | 80篇 |
国内免费 | 8篇 |
专业分类
化学 | 1247篇 |
晶体学 | 34篇 |
力学 | 44篇 |
数学 | 101篇 |
物理学 | 309篇 |
出版年
2024年 | 15篇 |
2023年 | 18篇 |
2022年 | 82篇 |
2021年 | 91篇 |
2020年 | 56篇 |
2019年 | 57篇 |
2018年 | 84篇 |
2017年 | 63篇 |
2016年 | 82篇 |
2015年 | 59篇 |
2014年 | 55篇 |
2013年 | 132篇 |
2012年 | 138篇 |
2011年 | 119篇 |
2010年 | 77篇 |
2009年 | 63篇 |
2008年 | 79篇 |
2007年 | 63篇 |
2006年 | 42篇 |
2005年 | 36篇 |
2004年 | 27篇 |
2003年 | 28篇 |
2002年 | 51篇 |
2001年 | 34篇 |
2000年 | 39篇 |
1999年 | 11篇 |
1998年 | 18篇 |
1997年 | 9篇 |
1996年 | 5篇 |
1995年 | 8篇 |
1994年 | 4篇 |
1993年 | 6篇 |
1992年 | 5篇 |
1991年 | 3篇 |
1990年 | 10篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1987年 | 6篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 6篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 3篇 |
1979年 | 6篇 |
1978年 | 6篇 |
1977年 | 3篇 |
1974年 | 2篇 |
1937年 | 2篇 |
排序方式: 共有1735条查询结果,搜索用时 31 毫秒
941.
Chloride and sulfate ions ingress behaviors in concrete are more complex and complicated processes than can be described by Fick's law of diffusion. A new approach based on two-dimensional correlation mapping (2D-CM) and particle-induced X-ray emission (PIXE) spectra was successfully applied to describe their transportation process. The use of hybrid 2D correlation enabled a fast comparison of ions ingress, whereas multiple perturbation correlation spectroscopy enabled the study of compositional factor affecting the ingress process. It was shown that by rearranging the same data in different ways, different techniques of 2D-CM could be applied and new information could be derived. The 2D-CM findings were in line with the classical PIXE analysis and consistent with the underlying physics of the experiments, which suggested that it will be a powerful and fast data analysis tool for PIXE spectra. 相似文献
942.
Dinh Hung Mac Abdul Sattar Srivari Chandrasekhar Jhillu Singh Yadav René Grée 《Tetrahedron》2012,68(43):8863-8868
A new versatile synthesis of 3-piperidones is described, starting from amino acids. It uses, as a key step, an iron carbonyl-mediated intramolecular tandem isomerization–aldolisation reaction. These new heterocycles appear as useful scaffolds for the total synthesis of various types of bioactive molecules. 相似文献
943.
944.
Alharbi F. F. Nisa Mehar Un Hassan Hassan Mohamed Ahmed Manzoor Sumaira Ahmad Zahoor Abid Abdul Ghafoor Aman Salma Ashiq Muhammad Naeem El-Nasser Karam S. Taha Taha Abdel Mohaymen 《Journal of Solid State Electrochemistry》2022,26(10):2171-2182
Journal of Solid State Electrochemistry - Metal sulfide and oxides have drawn interest as economical substitutes to noble metal catalysts due to their ability for oxygen evolution reaction (OER)... 相似文献
945.
Khan Ihtisham Wali Naeem Abdul Farooq Muhammad Mahmood Tahira Saeed Tooba Parveen Fouzia Malik Tabassum 《Catalysis Surveys from Asia》2022,26(3):144-160
Catalysis Surveys from Asia - The over-consumption of petroleum fuel due to the progressive increase in population, transportation, industrialization, modernization as well as improvement in the... 相似文献
946.
Basit Muhammad Abdul Tariq Zeeshan Zahid Saira Khan Sheheryar Siddiqui Farrukh Arsalan Khan Muhammad Farooq Ali Gohar Park Tae Joo 《Journal of Cluster Science》2022,33(6):2443-2454
Journal of Cluster Science - Successive ionic layer adsorption and reaction (SILAR) process has been diversely used for deposition of various metal chalcogenides. SnS is one of them. Owing to the... 相似文献
947.
948.
Journal of Nanoparticle Research - Highly sensitive low-cost non-enzymatic glucose sensor of copper oxide (CuO) nanorods (NRs) was successfully fabricated using a two-step anodization method with... 相似文献
949.