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111.
T. Tanabe R. Bock M. Dakowski A. Gobbi H. Sann H. Stelzer U. Lynen A. Olmi D. Pelte 《Nuclear Physics A》1980,342(1):194-212
The reaction 208Pb on 208Pb was studied at bombarding energies of 7.0 and 7.57 MeV/u. One-particle inclusive measurements using a large-area position-sensitive ionisation chamber delivered the kinetic energy, charge and scattering angle of the reaction products. A precise calibration of the stopping power for very heavy ions in the detector gas was performed. The measured Wilczynski diagrams show, for increasing loss of kinetic energy, an increase of the mean scattering angle. It is attributed to the dominance of the repulsive Coulomb forces with respect to the attractive nuclear forces. The element distribution for the 208Pb on 238U reaction at 7.5 MeV/u was also measured and compared to the PbPb and UU reactions. Fission probabilities are derived as a function of charge and total kinetic energy loss. The most striking result is seen in the σz2 versus TKEL correlation: the average rate of energy loss per nucleon exchange is abnormally large. It is shown that this behaviour is associated with the double magic closed shell character of the colliding nuclei. Nuclear structure information is extracted through a simple parametrisation. 相似文献
112.
113.
Side Reactions upon Interaction of Trimethylsilyl Azide with Trimethylphosphite and Trisdimethylaminophosphine Trisdimethylaminophosphine reacts with trimethylsilyl azide with evolution of nitrogen and formation of N-trimethylsilyl-iminophosphoric acid hexamethyltriamide, (Me2N)3 · P ? N? SiMe3. The diphosphazene (Me2N)3P ? N? P(NMe2)2 ? N? SiMe3 is formed in a side reaction with concomitant elimination of dimethylamino trimethylsilane. The reaction of trimethylsilyl azide with trimethylphosphite affords, besides the expected N-trimethylsilyliminophosphorus trimethylester, (MeO)3P ? N? SiMe3, the isomeric N-trimethylsilyl-N-methyl-aminophosphoric dimethylester, (MeO2)P(O)? N(Me)SiMe3. 相似文献
114.
115.
T.R. Dittrich C.R. Gould G.E. Mitchell E.G. Bilpuch K. Stelzer 《Nuclear Physics A》1977,279(3):430-444
Resonances in the 50Cr(p, p′γ) reaction were investigated with the TUNL high resolution system. All previously observed p-wave resonances between Ep = 2.00 and 3.03 MeV were studied. Measurement of the p' and the γ-ray angular distributions provides sufficient information to determine unambiguously the J-value of the resonance and the magnitude and relative phase of the inelastic decay amplitudes. Expressions are given for the appropriate angular distributions and for the transformation between the channel spin and the total angular momentum representation. Experimental results are presented for 24 p-wave resonances in 51Mn including decay amplitudes and relative phases for resonances. Six resonances formerly assigned are reassigned . Inelastic spectroscopic factors were determined for two analogue states. Proton strength functions were evaluated from both the elastic and inelastic data. 相似文献
116.
117.
M. Berlanger A. Gobbi F. Hanappe U. Lynen C. Ngô A. Olmi H. Sann H. Stelzer H. Richel M. F. Rivet 《Zeitschrift für Physik A Hadrons and Nuclei》1979,291(2):133-143
We have measured for the 430 MeV86Kr+92.98Mo systems the triple differential cross sectiond 3 σ/dEdAdZ (E=kinetic energy,A=mass andZ=atomic number) of the reaction products in the angular range (θ=25, 45°). We focussed attention on a fast collective mode in deep inelastic reactions: the neutron excess or charge equilibration. This mode is shown to relax very quickly to equilibrium within a time scale of the order of 10?22s. It is shown that this collective degree of freedom exhibit a quantal behavior which can be seen in the observation of quantal fluctuations. The experimental results are discussed in terms of a simple equilibrium model. The giant dipole resonance of the composite system could be closely connected to this neutron excess mode. 相似文献
118.
C. R. Gould R. Bass J. v. Czarnecki V. Hartmann K. Stelzer R. Zitzmann Y. Eyal 《Zeitschrift für Physik A Hadrons and Nuclei》1980,294(4):323-330
Neutrons have been detected in coincidence with charged reaction products in inelastic scattering of 7.5 MeV/u132Xe ions from197Au. The deduced neutron multiplicities associated with the heavy and light fragment, respectively, are roughly proportional to the total kinetic energy loss, and their ratios are close to the Au-Xe mass ratio for allQ-values. These results and the measured neutron energy spectra are consistent with the assumptions of thermal equilibrium between the fragments at scission, and of neutron emission from fully accelerated fragments. For deep inelastic events, the measured absolute multiplicities are smaller than expected from statistical model calculations, but an effect due to pre-equilibrium emission of particles — as suggested by an earlier analysis of the present data [1] — cannot be definitely established. 相似文献
119.
A. A. Stefanini G. Casini P. R. Maurenzig A. Olmi R. J. Charity R. Freifelder A. Gobbi N. Herrmann K. D. Hildenbrand M. Petrovici F. Rami H. Stelzer J. P. Wessels M. Gnirs D. Pelte J. Galin D. Guerreau U. Jahnke A. Péghaire J. C. Adloff B. Bilwes R. Bilwes G. Rudolf 《Zeitschrift für Physik A Hadrons and Nuclei》1995,351(2):167-186
Events with 2, 3 and 4 heavy fragments (A≥20) detected in the reactions100Mo +100Mo at 18.7, 23.7 A·MeV and120Sn +120Sn at 18.4 A·MeV were analyzed by means of an improved version of the kinematic coincidence method. The phase-space distributions prove that 3- (and possibly 4-) body events predominantly originate from a two-step mechanism and are compatible with the hypothesis of a binary deep-inelastic interaction followed by the further fissionlike decay of one (or both) of the primary fragments. The characteristics of the fission step — mass asymmetry, relative velocity, in-plane and out-of-plane angles — have been reconstructed for the 3-body events and indications are found that nonequilibrium effects at the end of the deep-inelastic phase may influence the fissionlike decay. 相似文献
120.