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31.
Il’ina I. V. Korchagina D. V. Morozova E. A. Tolstikova T. G. Volcho K. P. Salakhutdinov N. F. 《Russian Chemical Bulletin》2019,68(5):1061-1066
Russian Chemical Bulletin - A series of compounds with a hydrogenated 2H-chromene skeleton was synthesized by the reaction of ketones and available para-menthane monoterpenoid (—)-isopulegol.... 相似文献
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M. A. Morozova A. Yu. Sharaevskaya O. V. Matveev E. N. Beginin Yu. P. Sharaevskii 《Physics of Wave Phenomena》2016,24(1):1-6
A calculation model has been developed to describe the propagation of magnetostatic waves in a periodic structure consisting of two one-dimensional magnonic crystals, the periods of which are shifted relative to each other in the wave propagation direction. It is shown that, depending on the shift between the magnonic crystals, up to three bandgaps can be formed in this structure in the first Bragg resonance. 相似文献
35.
Ella Kazakova Julia Morozova Diana Mironova Victor Syakaev Liya Muslinkina Alexander Konovalov 《Supramolecular chemistry》2013,25(12):831-841
Here, we report on the study of cationic amidoammonium calix[4]resorcinarenes 1–5 of various lipophilicity capable of binding acid–base indicator methyl orange (MO). We identified the contributions of macrocycle aggregation and conformational mobility in the binding of MO. The effective pKa values of bound MO systematically decrease as the size and the packing density of the aggregates increase with an increase in calixresorcinarene lipophilicity. Consideration of a series of macrocycles clearly shows that large aggregates form most stable complexes, binding guests not on individual level but as aggregates. It was found that the most stable MO complex with 5 is formed due to electrostatic binding with ammonium groups of the macrocycle and incapsulation of MO in a hydrophobic layer of the aggregates. We have shown that competitive binding of MO and cationic surfactants by aggregates of 5 is suitable for visual/spectrophotometric detection of colourless anionic substrates. 相似文献
36.
Dmitry V. Pankratov Yulia S. Zeifman Olga V. Morozova Galina P. Shumakovich Irina S. Vasil'eva Sergey Shleev Vladimir O. Popov Alexander I. Yaropolov 《Electroanalysis》2013,25(5):1143-1149
14 Single‐ and multi‐walled carbon nanotubes from different sources were characterized in detail, and the characteristics obtained were carefully analyzed. The carbon material with the highest capacitance, and also other superior properties (“Taunit‐M” from “NanoTechCenter”, Russia), was chosen for further modification and fabrication of buckypaper based electrodes. These electrodes were biomodified with plant and fungal laccases, as well as fungal bilirubin oxidase. The designed biocathodes were investigated in simple buffers and also in a complex physiological fluid (human serum). Biocathodes based on immobilized fungal laccase were bioelectrocatalytically inactive in chloride containing media at neutral pH. In spite of the quite high current densities realized using biodevices based on plant laccase and fungal bilirubin oxidase, the limited thermal stability of the enzymes renders the biocathodes inadequate for practical applications in implanted situations. 相似文献
37.
E. S. Vikulova D. A. Piryazev K. V. Zherikova N. I. Alferova N. B. Morozova I. K. Igumenov 《Journal of Structural Chemistry》2013,54(5):883-889
Single crystal XRD is used to determine the structures of the complexes (H2TMEDA)[Mg(ptac)3]2 (1, TMEDA = Me2N(CH2)2NMe2, ptac = t BuCOCHCOCF3) and (H2TMEDA)[Mg(hfac)3](hfac) (2, hfac = CF3COCHCOCF3) at a temperature of 150 K. The crystallographic data for complex 1: a = 10.2919(3) Å, b = 10.9492(4) Å, c = 15.4159(6) Å, α = 87.117(1)°, β = 89.686(1)°, γ = 79,864(1)°, space group $P\bar 1$ Z = 1, R = 0.0573; for complex 2: a = 12.9446(2) Å, b = 23.0035(4) Å, c = 13.1473(3) Å, β = 98.779(1)°, space group P21/n, Z = 4, R = 0.0605. The structures are ionic; the metal atom coordinates six oxygen atoms of three β-diketonate ligands. The distances Mg-O in complex 1 are in the range 2.036(2)–2.0920(19) Å; the same distances in complex 2 are in the range 2.051(2)–2.076(2) Å. The spatial packing is determined by the system of hydrogen bonds between the (H2TMEDA)2+ cations and [Mg(ptac)3]? (1) or hfac? (2) anions. A thermogravimetric study of complex 1 is carried out. 相似文献
38.
Quantitative chromatographic analysis by the standard addition method was recommended for determining analytes in the samples whose matrices possess sorption properties. It was found that the use of several consecutive additives increased the accuracy of results, and it is applicable under the conditions of the nonlinear dependence of detector signals on the analyte amount, in particular, in the HPLC analysis with electrospray ionization and mass-spectrometric detection. Different dependences of the analyte concentrations to be determined on the total amounts of additives were established; because of this, the results should be extrapolated to either zero or infinitely large amounts of additives. A criterion was proposed for predicting a method for the extrapolation of experimental data. 相似文献
39.
Morozova O. S. Firsova A. A. Tyulenin Yu. P. Vorobieva G. A. Leonov A. V. 《Kinetics and Catalysis》2020,61(5):824-831
Kinetics and Catalysis - —Mechanochemical synthesis in a ball mill was applied for the nanocomposite Cu(CuO)–CeO2 catalyst preparation from CeO2 and following dopants: Cu metal and... 相似文献
40.
Evgeniia S. Vikulova Taisiya S. Sukhikh Sergey A. Gulyaev Igor Yu. Ilyin Natalia B. Morozova 《Molecules (Basel, Switzerland)》2022,27(3)
In order to demonstrate the role of the fluorination and some solvents in the structural organization of the Ag(I) coordination polymers with β-diketonate ligands (R1C(O)CαHC(O)R2)− we synthesized a series of the compounds containing tfac- (R1 = CH3, R2 = CF3) and pfpac- (R1 = CH3, R2 = C2F5) anions. Solvent-free [Ag(L)]∞ (L = tfac 1, pfpac 2) compounds and the corresponding acetonitrile and toluene adducts have been characterized by elemental analysis and/or NMR, IR and single-crystal XRD. This series includes five new coordination polymers. Compound 1 is a 3D coordination framework based on Ag–Ochelate/bridge, Ag–Cα bonds, and argentophilic interactions. An increase in the fluorinated group leads to a chain coordination polymer 2 of an unusual structural organization. These chains can be represented as a “DNA-type”, where two intertwined helices based on Ag–Ochelate and Ag–Cα bonds are connected through Ag–Obridge ones. Two structural types of chain coordination polymers, [Ag(tfac)(CH3CN)] and [Ag2(L)2(solvent)], have been revealed for the adducts. The latter structural type differs significantly from the previously studied toluene and acetonitrile adducts of fluorinated Ag(I) β-diketonates of the same stoichiometry. Thermal analysis in helium showed that both 1 and 2 decompose to metallic silver with the compound of pfpac-ligand being slightly more stable. 相似文献