全文获取类型
收费全文 | 626篇 |
免费 | 2篇 |
国内免费 | 2篇 |
专业分类
化学 | 299篇 |
晶体学 | 1篇 |
力学 | 14篇 |
数学 | 100篇 |
物理学 | 216篇 |
出版年
2022年 | 4篇 |
2021年 | 5篇 |
2020年 | 6篇 |
2018年 | 4篇 |
2016年 | 5篇 |
2015年 | 8篇 |
2014年 | 6篇 |
2013年 | 16篇 |
2012年 | 30篇 |
2011年 | 33篇 |
2010年 | 28篇 |
2009年 | 13篇 |
2008年 | 36篇 |
2007年 | 31篇 |
2006年 | 38篇 |
2005年 | 27篇 |
2004年 | 29篇 |
2003年 | 18篇 |
2002年 | 15篇 |
2001年 | 17篇 |
2000年 | 23篇 |
1999年 | 8篇 |
1998年 | 11篇 |
1997年 | 17篇 |
1996年 | 11篇 |
1995年 | 10篇 |
1994年 | 7篇 |
1993年 | 18篇 |
1992年 | 9篇 |
1991年 | 14篇 |
1990年 | 12篇 |
1989年 | 13篇 |
1988年 | 9篇 |
1987年 | 6篇 |
1986年 | 4篇 |
1985年 | 8篇 |
1984年 | 4篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1981年 | 8篇 |
1980年 | 5篇 |
1978年 | 8篇 |
1977年 | 6篇 |
1976年 | 3篇 |
1975年 | 4篇 |
1974年 | 4篇 |
1973年 | 4篇 |
1971年 | 3篇 |
1968年 | 4篇 |
1967年 | 3篇 |
排序方式: 共有630条查询结果,搜索用时 46 毫秒
51.
52.
T. Wågberg P.-A. Persson B. Sundqvist P. Jacobsson 《Applied Physics A: Materials Science & Processing》1997,64(3):223-226
60 are reported. Although prepared according to different routes the Raman spectra of the two polymeric phases of C60 show a quantitative agreement with respect to mode positions and intensity. We conclude from this that both materials have
the same structure at least in the short range order, i.e. the same type of bonding and co-ordination between neighbouring
C60 molecules. An investigation of the time dependence of the thermal decomposition of high pressure polymerised C60 is also presented. The rate of decomposition of the polymeric phase is found to be multi-exponential at all temperatures
investigated. From an Arrhenius-type analysis of the short time data and the long time data, respectively, the activation
energy for thermal dissociation of polymeric bonds was found to increase with time.
Received: 20 September 1996/Accepted: 11 November 1996 相似文献
53.
We show that the (p, p') Clarkson's inequality holds in the Edmunds-Triebel logarithmic spaces Aq(logA)b,q A_{\theta}({\log}A)_{b,q} and in the Zygmund spaces Lp(logL)b(W) L_p({\log}L)_b(\Omega) , for
b ? \mathbbR b \in \mathbb{R} and for suitable 1 £ p £ 2 1 \leq p \leq 2 . As a consequence of these results we also obtain some new information about the types and the cotypes of these spaces. 相似文献
54.
J. Cederkäll M. Lipoglavšek M. Palacz J. Persson J. Blomqvist A. Ataċ C. Fahlander H. Grawe A. Johnson W. Klamra J. Kownacki A. Likar L.–O. Norlin J. Nyberg R. Schubart D. Seweryniak G. de Angelis P. Bednarczyk Z. Dombrádi D. Foltescu M. Górska D. Jerrestam S. Juutinen E. Mäkelä B. M. G. Perez M. de Poli H. A. T. Shizuma Ö. Skeppstedt G. Sletten S. Törmänen 《The European Physical Journal A - Hadrons and Nuclei》1998,1(1):7-9
New excited states have been observed in the neutron deficient isotope 98Ag following the 58Ni+50Cr →108Te* heavy–ion reaction. One of these states may be interpreted as a maximum spin aligned state of the πg9/2
−3νg7/2 configuration. Other possible interpretations within the nuclear shell model are discussed as well.
Received: 24 October 1997 相似文献
55.
R. Albrecht T. C. Awes P. Beckmann F. Berger M. A. Bloomer D. Bock R. Bock G. Claesson G. Clewing L. Dragon A. Eklund R. L. Ferguson A. Franz S. Garpman R. Glasow H. Å. Gustafsson H. H. Gutbrod M. Hartig G. Hölker J. Idh P. Jacobs K. H. Kampert B. W. Kolb P. Kristiansson H. Löhner I. Lund F. E. Obenshain A. Oskarsson I. Otterlund T. Peitzmann S. Persson F. Plasil A. M. Poskanzer M. Purschke H. G. Ritter B. Roters S. Saini R. Santo H. R. Schmidt R. Schmidt S. P. Sørensen K. Steffens P. Steinhauser E. Stenlund D. Stüken M. L. Tincknell A. Twyhues G. R. Young 《Zeitschrift fur Physik C Particles and Fields》1992,53(2):225-237
Correlations between positive pions are investigated in the target fragmentation region of 200A GeV16O+nucleus collisions. The pions are measured with the Plastic Ball detector in the WA80 experiment at the CERN SPS. The target mass dependence of the radii and the correlation strength extracted by interferometry is studied. A new approach to the fit of the correlation function is introduced. The correlation strength and both invariant and transverse radii increase with decreasing target mass. The transverse radius for16O+C reactions appears to be much larger than the geometrical radius of the nuclei involved. For the Au target only a small fraction of the measured pions contributes to the apparent correlation. Hints for a much larger second component in16O+Au reactions are observed. Rescattering phenomena may provide a clue to understand these phenomena. 相似文献
56.
J. Kurpeta G. Lhersonneau A. Płochocki J.C. Wang P. Dendooven A. Honkanen M. Huhta M. Oinonen H. Penttilä K. Peräjärvi J.R. Persson J. Äystö 《The European Physical Journal A - Hadrons and Nuclei》2002,13(4):449-460
The decay of neutron-rich isotope 113Ru obtained as on-line mass separated product of proton-induced fission has been investigated by γγ coincidence and spectrum
multiscaling measurements. Decay schemes for both low- and high-spin isomers of 113Ru have been constructed. The level scheme of 113Rh is considerably extended. Systematics of the lowest-lying rhodium levels is smooth. The picture of shape coexistence established
for neutron-rich Rh isotopes near-neutron midshell is confirmed with the observation of a K = 1/2 deformed band, with its 3/2+ state at 600 keV being the lowest-lying level and of probable 7/2+
and 5/2+
band members. A large fraction of β feeding is found to populate high-lying levels in 113Rh. The GT strength in 113Rum decay is significantly larger than for the decay of 113Rug and of lighter rhodium isotopes.
Received: 18 January 2001 / Accepted: 14 January 2002 相似文献
57.
D. Sohler Zs. Dombrádi S. Brant J. Cederkäll M. Lipoglavšek M. Palacz V. Paar J. Persson A. Atac̣ C. Fahlander H. Grawe A. Johnson A. Kerek W. Klamra J. Kownacki A. Likar L. O. Norlin J. Nyberg R. Schubart D. Seweryniak G. de Angelis P. Bednarczyk D. Foltescu M. Fayez-Hassan D. Jerrestam S. Juutinen E. Mäkelä B. M. Nyakó M. de Poli H. A. Roth T. Shizuma Ö. Skeppstedt G. Sletten S. Törmänen 《Zeitschrift für Physik A Hadrons and Nuclei》1997,357(3):239-240
Excited states of 65Ge were populated via the 12C + 58Ni (261 MeV) reaction using the NORDBALL detector array equipped with charged-particle and neutron detector systems for reaction channel separation. On the basis of γγ-coincidence relations and angular distribution ratios a significantly extended level scheme was constructed up to E x = 9 MeV and J π = (33/2?). The low-energy states of the nucleus are discussed in the framework of the interacting boson-fermion model. 相似文献
58.
We consider iteration of arithmetic and power means and discuss methods for determining their limit. These means appear naturally in connection with some problems in homogenization theory. 相似文献
59.
60.