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1.
In a simple potential model, we have computed energies and widths of low-lying resonances of 14F and have compared them with recent experimental results. Consequences for 14B are summarized. 相似文献
2.
Résumé L'analyse du comportement rhéologique de sols d'acide polysilicique en solution aqueuse de concentration supérieure à 7 g 1–1 de silice en fonction du pH entre 6 et 11 et de la température entre 25 et 45 °C a permis de situer la gélification dans un domaine de pH compris entre 8 et 10. Ce processus prend une intensité maximale à 30°C. Le comportement rhéofluidifiant à bas gradients de cisaillement et antithixotrope donne naissance sur les rhéogrammes à un point d'inversion à pH = 9. L'ionisation des groupes silanols à la surface des particules colloïdales permet la réorganisation du milieu après cisaillement. Un état d'ionisation trop élevé est responsable d'un effet electro-répulsif à pH = 10. L'influence de la concentration et de la température sur ces processus est discutée.
The rheological behavior of polysilicic acid in aqueous solutions at higher concentrations than 7 g 1–1 of silice is studied for pH between 6 and 11 with temperature varying from 25° to 45°C. This study indicates that gelification takes place between pH 8 and 10. The process of gel formation attains the highest intensity at 30°C. The shear-thinning behavior at low shear rate gives rise to an inversion point at pH = 9 in shear stress—shear rate curves. The state of ionization at the surface of colloïdal silice particles after shear involve shear thickening observed at pH = 9. A high ionization degree causes an electrostatic repulsion at pH = 10. The concentration and temperature effects upon the organization of network are discussed.相似文献
3.
4.
Peter A. Seidl C. Fred Moore S. Mordechai R. Gilman Kalvir S. Dhuga H.T. Fortune J.D. Zumbro C.L. Morris J.A. Faucett G.R. Burleson 《Physics letters. [Part B]》1985,154(4):255-258
Eight angular distributions measured for 18(π+, π?)18Ne(gs) across the Δ33 resonance show the details of the energy dependence of the reaction. At higher energies, the maximum is at q ? 0.85 fm?1, in agreement with simple sequential scattering models, but a lower energies it is at q ? 0.5 fm?1, with the transition occuring over a narrow energy range. 相似文献
5.
S. Mordechai H.T. Fortune G.E. Moore M.E. Cobern R.V. Kollarits R. Middleton 《Nuclear Physics A》1978,301(3):463-476
The reaction 12C(t, p)14C has been investigated with an 18 MeV triton beam. Twenty energy levels of 14C were identified up to 13 MeV excitation. Angular distributions were measured and compared with DWBA calculations. A previously unreported 0+ level at 9.75 MeV was observed; it undoubtedly corresponds to the second predominantly sd shell 0+ state in 14C. Additional spin and parity assignments have been made in the present work: 9.81 MeV, (1?); 10.43 MeV, 2+; 10.50 MeV, (3?); 10.74 MeV, 4+; 11.40 MeV, 1?; 11.67 MeV, (1?); 11.73 MeV, (5?); 12.58 MeV, (2+, 3?); 12.87 MeV. 2+, 3?; and 12.96 MeV, (1?); none of which had a definite spin and parity assignment previously. Our results confirm the previous information on the level structure of 14C below 8.5 MeV. The cross section for the unnatural parity state at 7.34 MeV, Jπ = 2?, is well reproduced by a two-step reaction calculation. The results are compared with the predictions of a weak coupling model. 相似文献
6.
L.C. Bland H.T. Fortune D.L. Watson M.A. Abouzeid B.H. Wildenthal 《Nuclear Physics A》1984,431(2):237-255
The 27Al(t, p)29Al reaction was studied at an incident energy of Et = 15 MeV. Proton angular distributions were measured for the first 23 low-lying states. Comparisons of the data to DWBA calculations based on cluster-model and pure-configuration form factors were made which provided decompositions of the angular distributions into contributing L-values. Comparisons were also made to DWBA predictions based on microscopic amplitudes from a complete, sd-basis shell-model calculation. 相似文献
7.
The reaction 14N(3He, p)16O has been investigated at a bombarding energy of 15.0 MeV, using a differentially pumped gas target. Angular distributions were measured for 30 levels below 16.5 MeV in excitation. Data were compared with shell-model calculations of Zuker, Buck and McGrory for states whose correspondence with theory is established. Many states are found to possess a large compound-nucleus reaction component. Several previously unreported levels are observed at high excitation. Angular distributions for all except the weakest levels have been compared with DWBA calculations. 相似文献
8.
An experimental study of runaway electrons in the EAST tokamak has been performed by a recently developed multi‐channel hard x‐ray diagnostics based on NaI(TL) scintillator detectors. It is found that in the current quench phase, the inductive loop voltage plays an important role in the generation of runaway electrons. And the avalanche mechanism was the main mechanism for runaway electrons after the disruptions. The distribution and transportation of runaway electrons were also investigated by multi‐channel hard x‐ray diagnostics. It is also found that the intensity of runaway electrons emission in the core plasma was much higher than those in the downside of the cross‐section, while the emission intensity of runaway electrons in the core plasma was almost the same. Calculated shrinking coefficient of runaway electrons emission after the plasma disruption was about 26 m/s according to the experimental data (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
9.
Annetta Fortune 《Computational & Mathematical Organization Theory》2003,9(2):109-125
The purpose of this study is to investigate the differential impact that inter-organizational network connections have on organizational level change. Drawing from the strategic leaning perspective on adaptation, this study investigates how the nature of inter-organizational ties among top management impact the cost and the effectiveness of an organizational level change process. To build on the existing empirical work in this area, this study employs a virtual experiment to create a controlled laboratory investigation of the hypothesized relationships among the strength, formalization, and functional equivalence of network ties; and the cost and effectiveness of an organizational change process. The findings of this study provide support for the strength of weak ties argument and structural hole theory, in addition to suggesting a caveat to Galbraith's information processing model. Furthermore, the results reveal that the tradeoff between increasing effectiveness and decreasing costs is not universally applicable across all decisions regarding network structure. 相似文献
10.
R. Gilman L.C. Bland Peter A. Seidl C.Fred Moore C.L. Morris Steven J. Greene H.T. Fortune 《Nuclear Physics A》1985,432(3):610-618
An earlier model developed to fit the DCX excitation function of 18O has been extended to account for the angular distribution in terms of that for 16O and a double-isobaric-analog transition. 相似文献