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71.
Babaev E 《Physical review letters》2002,89(6):067001
We discuss linear topological defects allowed in two-gap superconductors and equivalent extended Faddeev model. We show that, in these systems, there exist vortices which carry an arbitrary fraction of magnetic flux quantum. Besides that, we discuss topological defects which do not carry magnetic flux and describe features of ordinary one-magnetic-flux-quantum vortices in the two-gap system. The results could be relevant for the newly discovered two-band superconductor MgB2. 相似文献
72.
An eikonal version of the DWIA is used to compute absorption and dispersion effects on the cross section for double charge exchange to its double analogue. Lacking information on the π?51V optical potential, recent data on π?40 Ca elastic scattering have been analyzed in the Glauber approximation and the extracted elastic phase function has been scaled up to correspond to 51V. The result is used in a computation of the DWIA amplitude. Large reduction factors are obtained in agreement with experimental upper bounds. Discrepancies with previous estimates are discussed. 相似文献
73.
Drokin Roman A. Tiufiakov Dmitrii V. Voinkov Egor K. Slepukhin Pavel A. Ulomsky Evgeny N. Esaulkova Yana L. Volobueva Alexandrina S. Lantseva Kristina S. Misyurina Mariya A. Zarubaev Vladimir V. Rusinov Vladimir L. 《Chemistry of Heterocyclic Compounds》2021,57(4):473-478
Chemistry of Heterocyclic Compounds - An azo coupling reaction of α-nitro ketones with 5-diazoazoles was used to obtain 4-alkyl-3-nitro-1,4-dihydroazolo[5,1-с][1,2,4]triazines, which... 相似文献
74.
Wilson J Guo H Morales R Podgornov E Lee I Zaera F 《Physical chemistry chemical physics : PCCP》2007,9(29):3830-3852
Examples from recent studies in our laboratory are presented to illustrate the main tools available to surface scientists for the determination of the kinetics of surface reactions. Emphasis is given here to hydrocarbon conversions and studies that rely on the use of model systems, typically single crystals and controlled (ultrahigh vacuum) environments. A detailed discussion is provided on the use of temperature-programmed desorption for the determination of activation energies as well as for product identification and yield estimations. Isothermal kinetic measurements are addressed next by focusing on studies under vacuum using molecular beams and surface-sensitive spectroscopies. That is followed by a review of the usefulness of high-pressure cells and other reactor designs for the emulation of realistic catalytic conditions. Finally, an analysis of the power of isotope labeling and chemical substitutions in mechanistic research on surface reactions is presented. 相似文献
75.
Nitric oxide (NO) is a key signaling molecule that acts in various physiological processes such as cellular metabolism, vasodilation and transmission of nerve impulses. A wide number of vascular diseases as well as various immune and neurodegenerative disorders were found to be directly associated with a disruption of NO production in living organisms. These issues justify a constant search of novel NO-donors with improved pharmacokinetic profiles and prolonged action. In a series of known structural classes capable of NO release, heterocyclic NO-donors are of special importance due to their increased hydrolytic stability and low toxicity. It is no wonder that synthetic and biochemical investigations of heterocyclic NO-donors have emerged significantly in recent years. In this review, we summarized recent advances in the synthesis, reactivity and biomedical applications of promising heterocyclic NO-donors (furoxans, sydnone imines, pyridazine dioxides, azasydnones). The synthetic potential of each heterocyclic system along with biochemical mechanisms of action are emphasized. 相似文献
76.
Egor V. Verbitskiy Pascal le Poul Filip Bure Sylvain Achelle Alberto Barsella Yuriy A. Kvashnin Gennady L. Rusinov Valery N. Charushin 《Molecules (Basel, Switzerland)》2022,27(13)
A series of novel V-shaped quinoxaline, [1,2,5]oxadiazolo[3,4-b]pyrazine and [1,2,5]thiadiazolo[3,4-b]pyrazine push–pull derivatives with 2,4′-biphenylene linker were designed and their electrochemical, photophysical and nonlinear optical properties were investigated. [1,2,5]Oxadiazolo[3,4-b]pyrazine is the stronger electron-withdrawing fragment as shown by electrochemical, and photophysical data. All compounds are emissive in a solid-state (from the cyan to red region of the spectrum) and quinoxaline derivatives are emissions in DCM solution. It has been found that quinoxaline derivatives demonstrate important solvatochromism and extra-large Stokes shifts, characteristic of twisted intramolecular charge transfer excited state as well as aggregation induced emission. The experimental conclusions have been justified by theoretical (TD-)DFT calculations. 相似文献
77.
78.
S. A. Gurvitz 《Physics letters. [Part B]》1976,60(5):405-408
Single scattering and n-exchange are shown to account for all large-q2 pD data (kL 1.5 GeV/c) our to q2 8.5 (GeV/c)2. From the extracted body-form factor we predict the deuteron charge form factor which agrees with the recent SLAC data. The agreement invalidates previous estimates of the NN* content of the neuteron. 相似文献
79.
80.