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31.
L. S. Atabekyan N. A. Lobova A. N. Vedernikov S. P. Gromov A. K. Chibisov 《High Energy Chemistry》2012,46(2):100-105
Photophysical processes in a styryl dye; an azacrown-containing analog; and its complexes with barium, lead, calcium, sodium,
and silver cations have been studied by laser kinetic and luminescent spectroscopy. The participation of the triplet state
in the degradation of photoexcitation energy has been established. Phosphorescence and delayed fluorescence of dyes and its
complexes have been revealed found. It has been concluded that the molecules can exist in the excited TICT state. 相似文献
32.
F. A. Bykovskii E. F. Vedernikov 《Journal of Applied Mechanics and Technical Physics》2000,41(1):35-43
A vortex structure of an air flow with a characteristic size of vortices comparable with the primary vortex size was observed
in a vortex chamber of planar-radial geometry for the first time. The vortex component of the flow velocity along the chamber
radius and its axis was calculated.
Lavrent'ev Institute of Hydrodynamics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated from
Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 41, No. 1, pp. 41–49, January–February, 2000. 相似文献
33.
V. A. Vedernikov 《Mathematical Notes》1996,59(2):219-221
Translated fromMatematicheskie Zametki, Vol. 59, No. 2, pp. 311–314, February, 1996. 相似文献
34.
Di(2-pyridyl)ketone dimethylplatinum(ii), (dpk)PtII(CH3)2, reacts with CD3OD at 25 °C to undergo complete deuteration of Pt–CH3 fragments in ∼5 h without loss of methane to form (dpk)PtII(CD3)2 in virtually quantitative yield. The deuteration can be reversed by dissolution in CH3OH or CD3OH. Kinetic analysis and isotope effects, together with support from density functional theory calculations indicate a metal–ligand cooperative mechanism wherein DPK enables Pt–CH3 deuteration by allowing non-rate-limiting protonation of PtII by CD3OD. In contrast, other model di(2-pyridyl) ligands enable rate-limiting protonation of PtII, resulting in non-rate-limiting C–H(D) reductive coupling. Owing to its electron-poor nature, following complete deuteration, DPK can be dissociated from the PtII-centre, furnishing [(CD3)2PtII(μ-SMe2)]2 as the perdeutero analogue of [(CH3)2PtII(μ-SMe2)]2, a commonly used PtII-precursor.Di(2-pyridyl)ketone dimethylplatinum(ii), (dpk)PtII(CH3)2, reacts with CD3OD at 25 °C to undergo complete deuteration of Pt–CH3 fragments in ∼5 h without loss of methane to form (dpk)PtII(CD3)2 in virtually quantitative yield. 相似文献
35.
Strokach Yu. P. Valova T. M. Barachevsky V. A. Alfimov M. V. Gromov S. P. Vedernikov A. I. Demina O. V. Lukin A. Yu. Shevyakov S. V. Shvets V. I. Khodonov A. A. Lugtenburg J. 《Russian Chemical Bulletin》2003,52(12):2656-2660
Complexation of crown ether vinylogs containing different terminal polar groups with alkali and alkali-earth metal ions in solutions was studied by spectrophotometry. The hypsochromic shift of absorption band maxima in the UV-Vis absorption spectra indicates that the ligands containing the monobenzocrown ether fragments interact with metal ions. The scheme of complexation was proposed, and the stability constants of the complexes were determined. The efficiency of complexation depends on the metal cation size and the structure of the ionophoric fragment. 相似文献
36.
O. A. Fedorova A. I. Vedernikov O. V. Yescheulova P. V. Tsapenko Yu. V. Pershina S. P. Gromov 《Russian Chemical Bulletin》2000,49(11):1853-1858
The condensation of 3,4-bis(2-haloethoxy)benzaldehydes with acyclic α,ω-alkanedithiols in the presence of alkali metal carbonates
in dry ethanol, DMF, MeCN and their mixtures with water gives formyl derivatives of benzothiacrown compounds in high yields.
The best results are attained when the radius of the hydrated metal cation fits to the crown ether cavity. In the case of
Cs+, high yields were observed for crown ethers of any size and composition; this can be explained by a specific template effect
of this cation. The influence of the nature of the leaving group in 3,4-bis(2-haloethoxy)benzaldehydes was established for
reactions with dithiols containing no ether oxygen atoms.
Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya No. 11, pp. 1881–1886, November, 2000. 相似文献
37.
A method for remote monitoring of temperature in the focal region of a high-intensity ultrasonic transducer is described. Results of measurements and theoretical simulation are presented. The measurements were conducted on a polymer sample with thermophysical and acoustic parameters close to the properties of a soft biological tissue. The sample was heated by a focused piezoelectric transducer with different values of radiation power. The delay of a probe pulse transmitted through the heated region perpendicularly to the axis of the intense ultrasonic beam was detected. The local character of temperature measurements was provided by focusing the probe pulse at the heated region. The application of an additional transducer installed confocally with the probing one provided an opportunity to enhance the precision of measurements. An analysis was conducted on the basis of a numerical solution of the heat conduction equation. The function of thermal sources in the heat conduction equation was calculated according to the results of measuring the pressure distribution in the focal region of the heating transducer. The experimental data obtained agree well with the results of simulation and demonstrate a fundamental possibility of using the proposed ultrasonic technique for remote temperature measurements. 相似文献
38.
Kuz’mina L. G. Vedernikov A. I. Gromov S. P. Alfimov M. V. 《Crystallography Reports》2019,64(5):691-712
Crystallography Reports - Based on the results of authors' studies, an approach to the analysis of [2 + 2] photocycloaddition (PCA) topochemical reactions of unsaturated compounds, occurring in... 相似文献
39.
40.
Sobanov A. A. Vedernikov A. N. Dyuker G. Solomonov B. N. 《Russian Journal of General Chemistry》2003,73(6):842-846
The complex bis(-dimethyl sulfido)tetramethyldiplatinum(II) reacts with 1,4,7-triisopropyl-1,4,7-triazacyclopropanone (L) over the course of 24 h at room temperature in THF-d
8 to give [PtMe2(L)] and PtMe2(SMe2)2. Subsequent addition of 1 mol of trifluoromethanesulfonic acid results in immediate formation of a previously unknown stable cationic complex [PtMe2H(L)]+SO3CF3
-. This product can also be prepared by oxidative addition of the N-H bond of LH+SO3CF3
- to the starting complex, which points to a higher basicity of the platinum atom in [PtMe2(L)] compared with the nitrogen atom in the ligand L. The pK
a of the cationic hydride of platinum(IV) was estimated. 相似文献