全文获取类型
收费全文 | 3822篇 |
免费 | 136篇 |
国内免费 | 14篇 |
专业分类
化学 | 2471篇 |
晶体学 | 22篇 |
力学 | 141篇 |
数学 | 738篇 |
物理学 | 600篇 |
出版年
2023年 | 18篇 |
2022年 | 64篇 |
2021年 | 90篇 |
2020年 | 40篇 |
2019年 | 76篇 |
2018年 | 52篇 |
2017年 | 71篇 |
2016年 | 125篇 |
2015年 | 118篇 |
2014年 | 108篇 |
2013年 | 231篇 |
2012年 | 214篇 |
2011年 | 228篇 |
2010年 | 142篇 |
2009年 | 141篇 |
2008年 | 235篇 |
2007年 | 194篇 |
2006年 | 212篇 |
2005年 | 192篇 |
2004年 | 136篇 |
2003年 | 136篇 |
2002年 | 102篇 |
2001年 | 58篇 |
2000年 | 57篇 |
1999年 | 61篇 |
1998年 | 38篇 |
1997年 | 38篇 |
1996年 | 52篇 |
1995年 | 44篇 |
1994年 | 43篇 |
1993年 | 47篇 |
1992年 | 40篇 |
1991年 | 24篇 |
1990年 | 26篇 |
1989年 | 22篇 |
1988年 | 20篇 |
1987年 | 26篇 |
1986年 | 17篇 |
1985年 | 49篇 |
1984年 | 37篇 |
1983年 | 45篇 |
1982年 | 31篇 |
1981年 | 25篇 |
1980年 | 31篇 |
1979年 | 26篇 |
1977年 | 25篇 |
1976年 | 18篇 |
1975年 | 19篇 |
1974年 | 15篇 |
1973年 | 15篇 |
排序方式: 共有3972条查询结果,搜索用时 15 毫秒
21.
Renato Mario Benazic Tome 《Bulletin of the Brazilian Mathematical Society》1997,28(2):211-231
In this paper, the desingularization problem for an absolutely isolated singularity of an-dimensional holomorphic vector field is solved. Also, we exhibit final forms under blowing-up for this type of singularities. 相似文献
22.
23.
R. Arnaldi R. Averbeck K. Banicz J. Castor B. Chaurand C. Cicalo A. Colla P. Cortese S. Damjanovic A. David A. De Falco A. Devaux A. Drees L. Ducroux H. En’yo A. Ferretti M. Floris A. Foerster P. Force N. Guettet A. Guichard H. Gulkanian J. Heuser M. Keil L. Kluberg J. Lozano C. Lourenço F. Manso A. Masoni P. Martins A. Neves H. Ohnishi C. Oppedisano P. Parracho P. Pillot G. Puddu E. Radermacher P. Ramalhete P. Rosinsky E. Scomparin J. Seixas S. Serci R. Shahoyan P. Sonderegger H.J. Specht R. Tieulent G. Usai R. Veenhof H.K. Wöhri 《The European Physical Journal C - Particles and Fields》2007,49(1):235-241
The NA60 experiment at the CERN SPS has studied low-mass muon pairs in 158 A GeV In–In collisions. A strong excess of pairs
is observed above the yield expected from neutral meson decays. The unprecedented sample size close to 400000 events and the
good mass resolution of about 2% made it possible to isolate the excess by subtraction of the decay sources. The shape of
the resulting mass spectrum shows some non-trivial centrality dependence, but is largely consistent with a dominant contribution
from π+π-→ϱ→μ+μ- annihilation. The associated ϱ spectral function exhibits considerable broadening, but essentially no shift in mass. The
pT-differential mass spectra show the excess to be much stronger at low pT than at high pT. The results are compared to theoretical model predictions; they tend to rule out models linking hadron masses directly to
the chiral condensate.
PACS 25.75.-q; 12.38.Mh; 13.85.Qk 相似文献
24.
Mario Piris 《Journal of mathematical chemistry》1998,23(3-4):399-404
The first derivatives of the total energy with respect to nuclear displacement have been calculated in the framework of the
Improved Bardeen–Cooper–Schrieffer (IBCS) method. It permits the quick determination of the stationary points.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
25.
Mario Landucci 《Annali di Matematica Pura ed Applicata》1989,155(1):193-203
Sunto In questo lavoro si studia il problema dell'existenza o meno di mappe olomorfe proprie, F: (p,q) (pq) dove (,) Cn sono domini limitati, pseudoconvessi, non lisci, di Reinhardt con centro di simmetria sulla frontiera (per la definizione v. (2), introduzione). In caso affermativo si fornisee esplicitamente l'espressione di tali mappe (v, teoremi I e II nell'introduzione).
The author, during the redaction of this paper, was supported by MPI (40% and 60%) funds. 相似文献
The author, during the redaction of this paper, was supported by MPI (40% and 60%) funds. 相似文献
26.
We characterize the existence of blocking sets in a particular class of S (3,4,v) and we give a construction to obtain S(3,4,2v) having blocking sets.Lavoro eseguito nell'ambito del GNSAGA e con contributo del M.P.I. 相似文献
27.
Summary In this paper we study the Dirichlet problem, for second order, linear elliptic partial differential equations with discontinuous coefficients in unbounded domains. We obtain some results about existence and uniqueness of the solution in W2().
Lavoro eseguito nell'ambito del G.N.A.F.A. del C.N.R. 相似文献
Lavoro eseguito nell'ambito del G.N.A.F.A. del C.N.R. 相似文献
28.
Franco Piacenti Mario Bianchi Piero Frediani Ugo Matteoli 《Journal of organometallic chemistry》1975,87(3):C54-C55
Both normal and secondary alkylcobalt carbonyls are shown not to undergo isomerization under catalytic “oxo” conditions, and the relevance of this obervation for the mechanism of the “oxo” reaction is discussed. 相似文献
29.
30.
JPC – Journal of Planar Chromatography – Modern TLC - A new simple, rapid, and selective high-performance thin-layer chromatographic (HPTLC) method with metronidazole as the internal... 相似文献