全文获取类型
收费全文 | 536494篇 |
免费 | 6074篇 |
国内免费 | 2307篇 |
专业分类
化学 | 275210篇 |
晶体学 | 7748篇 |
力学 | 26449篇 |
综合类 | 127篇 |
数学 | 68957篇 |
物理学 | 166384篇 |
出版年
2021年 | 5299篇 |
2020年 | 5810篇 |
2019年 | 6542篇 |
2018年 | 8667篇 |
2017年 | 8828篇 |
2016年 | 12062篇 |
2015年 | 6571篇 |
2014年 | 10986篇 |
2013年 | 24186篇 |
2012年 | 19165篇 |
2011年 | 22631篇 |
2010年 | 17017篇 |
2009年 | 16810篇 |
2008年 | 21249篇 |
2007年 | 21011篇 |
2006年 | 19040篇 |
2005年 | 16980篇 |
2004年 | 15813篇 |
2003年 | 14267篇 |
2002年 | 14183篇 |
2001年 | 14989篇 |
2000年 | 11510篇 |
1999年 | 8961篇 |
1998年 | 7736篇 |
1997年 | 7576篇 |
1996年 | 7056篇 |
1995年 | 6351篇 |
1994年 | 6362篇 |
1993年 | 6103篇 |
1992年 | 6450篇 |
1991年 | 6941篇 |
1990年 | 6623篇 |
1989年 | 6538篇 |
1988年 | 6353篇 |
1987年 | 6163篇 |
1986年 | 5902篇 |
1985年 | 7439篇 |
1984年 | 7779篇 |
1983年 | 6538篇 |
1982年 | 6825篇 |
1981年 | 6334篇 |
1980年 | 6010篇 |
1979年 | 6509篇 |
1978年 | 6745篇 |
1977年 | 6634篇 |
1976年 | 6590篇 |
1975年 | 6305篇 |
1974年 | 6131篇 |
1973年 | 6424篇 |
1972年 | 4707篇 |
排序方式: 共有10000条查询结果,搜索用时 656 毫秒
81.
Avrutskiy V. I. Ishkhanyan A. M. Krainov V. P. 《Theoretical and Mathematical Physics》2021,208(3):1201-1206
Theoretical and Mathematical Physics - The fractional derivative method is used to take wave dispersion into account in the wave equation when describing the propagation of gravitational soliton... 相似文献
82.
Crystallography Reports - Methods of coherent X-ray diffraction imaging of the spatial structure of noncrystalline objects and nanocrystals (nanostructures) are considered. Particular attention is... 相似文献
83.
Satyanarayana A. V. S. Rao M. Jagannadha Mouli K. Chandra 《Journal of Radioanalytical and Nuclear Chemistry》2022,331(3):1509-1513
Journal of Radioanalytical and Nuclear Chemistry - 相似文献
84.
Russian Physics Journal - The paper shows that the values of zero-point energy and vibrations of atoms in a crystal determined by the uncertainty principle, depend on the dynamic response of atoms.... 相似文献
85.
Journal of Applied and Industrial Mathematics - We study the problem of optimal location of the ambulance fleet at the base stations. The objective is to minimize the average waiting time for... 相似文献
86.
87.
88.
Kang Il Yoo Ji Yeong Jeon Su Jeong Ryu Giri Nam Hyewon Youn Eun Young Choi 《Experimental & molecular medicine》2015,47(2):e140
In allogeneic transplantation, including the B6 anti-BALB.B settings, H60 and H4 are two representative dominant minor histocompatibility antigens that induce strong CD8 T-cell responses. With different distribution patterns, H60 expression is restricted to hematopoietic cells, whereas H4 is ubiquitously expressed. H60-specific CD8 T-cell response has been known to be dominant in most cases of B6 anti-BALB.B allo-responses, except in the case of skin transplantation. To understand the mechanism underlying the subdominance of H60 during allogeneic skin transplantation, we investigated the dynamics of the H60-specific CD8 T cells in B6 mice transplanted with allogeneic BALB.B tail skin. Unexpectedly, longitudinal bioluminescence imaging and flow cytometric analyses revealed that H60-specific CD8 T cells were not always subdominant to H4-specific cells but instead showed a brief dominance before the H4 response became predominant. H60-specific CD8 T cells could expand in the draining lymph node and migrate to the BALB.B allografts, indicating their active participation in the anti-BALB.B allo-response. Enhancing the frequencies of H60-reactive CD8 T cells prior to skin transplantation reversed the immune hierarchy between H60 and H4. Additionally, H60 became predominant when antigen presentation was limited to the direct pathway. However, when antigen presentation was restricted to the indirect pathway, the expansion of H60-specific CD8 T cells was limited, whereas H4-specific CD8 T cells expanded significantly, suggesting that the temporary immunodominance and eventual subdominance of H60 could be due to their reliance on the direct antigen presentation pathway. These results enhance our understanding of the immunodominance phenomenon following allogeneic tissue transplantation. 相似文献
89.
Paired single residue‐transposed Lys‐N and Lys‐C digestions for label‐free identification of N‐terminal and C‐terminal MS/MS peptide product ions: ultrahigh resolution Fourier transform ion cyclotron resonance mass spectrometry and tandem mass spectrometry for peptide de novo sequencing 下载免费PDF全文
90.
The influence of different referencing methods on the accuracy of δ13C value measurement of ethanol fuel by gas chromatography/combustion/isotope ratio mass spectrometry 下载免费PDF全文