全文获取类型
收费全文 | 235篇 |
免费 | 2篇 |
专业分类
化学 | 83篇 |
晶体学 | 1篇 |
力学 | 14篇 |
数学 | 27篇 |
物理学 | 112篇 |
出版年
2022年 | 5篇 |
2021年 | 9篇 |
2020年 | 4篇 |
2019年 | 11篇 |
2018年 | 10篇 |
2017年 | 8篇 |
2016年 | 11篇 |
2015年 | 3篇 |
2014年 | 5篇 |
2013年 | 11篇 |
2012年 | 9篇 |
2011年 | 21篇 |
2010年 | 8篇 |
2009年 | 16篇 |
2008年 | 6篇 |
2007年 | 14篇 |
2006年 | 8篇 |
2005年 | 5篇 |
2004年 | 6篇 |
2003年 | 2篇 |
2002年 | 4篇 |
2001年 | 3篇 |
2000年 | 7篇 |
1999年 | 5篇 |
1998年 | 7篇 |
1997年 | 2篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1983年 | 1篇 |
1978年 | 1篇 |
1976年 | 3篇 |
1974年 | 1篇 |
1973年 | 2篇 |
1972年 | 1篇 |
1971年 | 1篇 |
1969年 | 1篇 |
1967年 | 5篇 |
1966年 | 4篇 |
1965年 | 1篇 |
排序方式: 共有237条查询结果,搜索用时 8 毫秒
231.
Kalmykov Y Adachi T Berg GP Fujita H Fujita K Fujita Y Hatanaka K Kamiya J Nakanishi K von Neumann-Cosel P Ponomarev VY Richter A Sakamoto N Sakemi Y Shevchenko A Shimbara Y Shimizu Y Smit FD Wakasa T Wambach J Yosoi M 《Physical review letters》2006,96(1):012502
The fine structure of the Gamow-Teller resonance in a medium-heavy nucleus is observed for the first time in a high-resolution 90Zr(3He,t)90Nb experiment at the Research Center for Nuclear Physics, Osaka. Using a novel wavelet analysis technique, it is possible to extract characteristic energy scales and to quantify their relative importance for the generation of the fine structure. This method combined with the selectivity of the reaction permits an extraction of the level density of 1+ states in 90Nb. 相似文献
232.
The works by D.V. Skobel’tsyn that laid the foundation of the contemporary physics of cosmic rays and the physics of high energies are considered. Skobel’tsyn demonstrated that cosmic rays contain particles whose energy substantially surpasses the energies that are typical of radioactive decay, discovered the existence of air showers, i.e., when several particles hit an array simultaneously, and performed a series of investigations into extensive air showers that resulted in the discovery of a nuclear-cascade process in the atmosphere. The results that Skobel’tsyn obtained were of primary importance for the further development of cosmic-ray physics. 相似文献
233.
St. N. Kalmykov Yu. A. Sapozhnikov I. P. Efimov J. A. Broadway L. D. Sapozhnikova 《Journal of Radioanalytical and Nuclear Chemistry》1998,229(1-2):95-97
Fourteen samples of wastes from algal plants were tested for possible analytical and/or technological use for90Sr and137Cs extraction from natural waters. Sorption experiments were carried out in static and dynanic conditions. It was noted that
the examined sorbents posses high affinity for Sr2+. The sorption capacity reached the value of 4.72·10−3 mole/g. Simple and express analytical procedures for90Sr determination were developed and tested in the Dnieper estuary region. 相似文献
234.
Konstantin I. Maslakov Yury A. Teterin Mikhail V. Ryzhkov Aleksej J. Popel Anton Yu. Teterin Kirill E. Ivanov Stepan N. Kalmykov Vladimir G. Petrov Ian Farnan 《International journal of quantum chemistry》2019,119(24):e26040
The nature of the chemical bond in UO2 was analyzed taking into account the X-ray photoelectron spectroscopy (XPS) structure parameters of the valence and core electrons, as well as the relativistic discrete variation electronic structure calculation results for this oxide. The ionic/covalent nature of the chemical bond was determined for the UO8 (D4h) cluster, reflecting uranium's close environment in UO2, and the U13O56 and U63O216 clusters, reflecting the bulk of solid uranium dioxide. The bar graph of the theoretical valence band (from 0 to ~35 eV) of XPS spectrum was built such that it was in satisfactory agreement with the experimental spectrum of a UO2 single crystalline thin film. It was shown that unlike the crystal field theory results, the covalence effects in UO2 are significant due to the strong overlap of the U 6p and U 5f atomic orbitals with the ligand orbitals, in addition to the U 6d atomic orbital (AO). A quantitative molecular orbital (MO) scheme for UO2 was built. The contribution of the MO electrons to the chemical bond covalence component was evaluated on the basis of the bond population values. It was found that the electrons of inner valence molecular orbitals (IVMO) weaken the chemical bond formed by the electrons of outer valence molecular orbitals (OVMO) by 32% in UO8 and by 25% in U63O216. 相似文献
235.
Andreev N.E. Kalmykov S.Y. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》2000,28(4):1106-1115
Spectral features of a large-angle stimulated Raman scattering (LA SRS) of a short electromagnetic pulse in an underdense plasma, which are caused by the presence in a plasma of a given linear long-wavelength electron plasma wave (LW EPW), are investigated. It is shown that the LW EPW, whose phase velocity coincides with a group velocity of a pulse and a density perturbation normalized to a background electron density δnLW/n0 exceeds the ratio of the electron plasma frequency to the laser frequency ωpe/ω0 suppresses the well-known Stokes branch of the weakly coupled LA SRS. Under the same condition, the anti-Stokes band appears in the spectrum of the scattered radiation. Variation of a scattering angle and an electron temperature do not significantly modify qualitative features of the effect. In the case of strongly coupled LA SRS, the maximum of the increment is decreased by nearly one-half for δnLW/n0~(a0ωpe /ω0)2/3≫ωpe /ω0, where a0 is an amplitude of an electron quiver velocity in the laser field normalized to a speed of light c, and it decreases further with an increase in plasma density perturbation in LW EPW 相似文献
236.
I. S. Karpikov J. A. Bellido R. W. Clay N. N. Kalmykov G. I. Rubtsov S. V. Troitsky 《Physics of Atomic Nuclei》2019,82(6):694-698
The Sydney University Giant Air-shower Recorder(SUGAR) measured the energy spectrum of ultra-high-energy cosmic rays reconstructed from muon detector reading. Comparison of their spectra SUGAR and Pierre Auger Observatory allows us to reconstruct the empirical dependence of the number of muons in a vertical shower on the primary energy for energies between 1017 and 1018 eV. We compared this dependence with the predictions of hadronic interaction models QGSJET-II-04, EPOS-LHC and SIBYLL-2.3c. In addition, we analyzed the response of the array of muon detectors in order to determine the slope of the muon lateral distribution function. It is important to understand how much the number of muons differs from the predictions of modeling at different distances from the shower axis. 相似文献
237.
B. V. Antokhonov S. F. Berezhnev D. Besson N. M. Budnev R. Wischnevski O. A. Gress A. N. Diachok A. V. Zablotsky A. V. Zagorodnikov N. N. Kalmykov N. I. Karpov V. A. Kozhin E. E. Korosteleva A. V. Korobchenko L. A. Kuzmichev A. Chiavassa B. K. Lubsandorzhiev R. R. Mirgazov M. I. Panasyuk L. V. Pankov V. V. Prosin V. S. Ptuskin Yu. A. Semeney A. A. Silaev A. A. Silaev Jr. A. V. Skurikhin M. Stokham O. A. Chvalaiev B. A. Shaibonov Jr. J. Snyder Ch. Spiering I. V. Yashin 《Bulletin of the Russian Academy of Sciences: Physics》2011,75(3):367-370
A new array for studying ultra-high energy cosmic rays was inaugurated in 2009 in the Tunka Valley, about 50 km from Lake Baikal. Having an area of 1 km2, the new facility allows us to study cosmic rays with energies of 1015–1018 eV via the a unified method for registering Cherenkov radiation from extensive air showers (EASes) and is making a substantial contribution to understanding the origin of ultra-high energy cosmic rays. We describe the current state of the experiment, the new methodological approach, our initial results, and the plans for further development of the array. 相似文献