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81.
N.?A.?Anurova V.?A.?BlatovEmail author G.?D.?Ilyushin O.?A.?Blatova A.?K.?Ivanov-Shits L.?N.?Dem’yanets 《Russian Journal of Electrochemistry》2009,45(4):417-428
Novel method for the studying of voids and channels in crystal structures is developed on the basis of the TOPOS structure-topology software. The method is using the Voronoi-Dirichlet crystal space partition. All ternary and quaternary lithium-containing inorganic compounds whose structure has been studied (822 compounds of the Li a X b O z composition and 1349 compounds of the Li a X1 b X2 c O z composition, where X, X1, and X2 is any chemical element) are analyzed for the first time. The dimensionality of systems of the channels capable of transporting lithium ions is revealed. For all compounds, the migration patterns are constructed, which characterize systems of the conductance channels with the dimensionality 1, 2, and 3; the theoretically calculated coordinates of lithium atom positions in the voids’ centers agree well (accurate within 0.06 nm) with the known structure data. It is found, that 275 compounds have infinite channel system. Of this sampling, 249 compounds (125 structural types) have been described as solid electrolytes; the rest (26 compounds) can be thought of as potential ionic conductors with one-dimensional (6 types), two-dimensional (2 types), or three-dimensional (18 types) conductance. 相似文献
82.
The combinatorial and topologic analysis (the TOPOS 4.0 program package, the coordination sequences method) is carried out for the crystal structures of the orthogermanates Li[6]Sc[6]Ge[4]O4 (the olivine type, space group Pnuma) and Li[6]Ho[8]Ho 2 [7] (GeO4)2F2 (space group I2/c). The same type of 2D TR,Ge-net with the Schläfli index of 3442 + 3242 and the site ratio of TR: Ge = 1: 1 is discovered for both structures. Four-polyhedral ring precursor clusters (TR)2T2 are identified using the two-color decomposition of structural graphs. All the clusters have a symmetry center; they differ in the types of TR polyhedra (ScO6 and HoO6F), which are linked through GeO4 orthotetrahedra into a ring. The Li atoms reside above and under the centers of the clusters. The Li2(TR)2T2 clusters determine the formation of crystal-forming clusters of a higher level by means of matrix self-assembly. The coordination number of the precursor clusters in the 2D net is six, which is the highest possible value. 相似文献
83.
An attempt is made to reveal the self-organization of atomic magnetic moments in rare-earth ferrimagnets of the TbFe2 type, an effect reported on in the works of S.K. Godovikov. A careful experimental study and a critical analysis of the data reported in his publications suggest that there are no grounds to maintain that this phenomenon exists. 相似文献
84.
V.V. Ilyushin E.A. Alekseev S.F. Dyubko I. Kleiner 《Journal of Molecular Spectroscopy》2003,220(2):170-186
We have fitted to within experimental accuracy a data set for acetic acid CH3COOH consisting of 2103 vt=0, 1111 vt=1 and 634 vt=2 microwave lines, using the so-called “rho axis method” and a model extended to include perturbation terms through eighth order. The previously published 2109 vt=0 and 409 vt=1 microwave lines have been extended by new measurements from Kharkov. The final fit requires only 62 parameters to achieve a unitless weighted standard deviation for the whole fit of 0.85 for a total of 3848 lines and includes transitions with J27 (15) and |Ka|13 (8) for the vt=2 A (E)-species, respectively. This result represents a significant improvement over our previous fit which was dominated by vt=0 transitions. A calculation of the linestrengths of torsion–rotation transitions is also provided. 相似文献
85.
86.
I. V. Shugalei A. P. Voznyakovskii A. V. Garabadzhiu I. V. Tselinskii A. M. Sudarikov M. A. Ilyushin 《Russian Journal of General Chemistry》2013,83(5):851-883
The present review summarizes and analyzes recent advances in the field of medical and biological applications of detonation nanodiamond and, on this basis, considers most promising ways of creation of anticancer and antimicrobial drugs, diagnostic agents, and nanocompositions for orthopedic surgery. In addition, progress in the surface chemistry of detonation nanodiamond is discussed and problems related to purposeful surface modification with a view to obtain detonation nanodiamond with desired properties ensuring their successful application in biology and medicine are considered. 相似文献
87.
88.
The results of investigation into the mechanism of formation of an inverse turbulence energy cascade in an axially symmetric submerged jet based on numerical modeling by the large eddy simulation. The flow structure is calculated using two models of subgrid turbulence in a broad range of Reynolds numbers with the imposed external harmonic low-amplitude perturbation and swirling. Calculations showed that upon imposing swirling, the effect of formation of the inverse cascade is suppressed, while upon imposing the external low-amplitude harmonic perturbations corresponding to the frequency of highest perceptivity, it is enhanced. We can assume that the regions with the inverse turbulence energy flow are formed there where the dynamics of large quasi-2D structures is determined by the mechanisms of combining eddies and involvement processes, while the tension mechanism of vortex tubes is suppressed. It is shown that the balance of these mechanisms can be controlled by means of imposition of low-amplitude harmonic perturbations. 相似文献
89.
Antonov N. N. Baldin A. A. Viktorov V. A. Galoyan A. S. Gapienko V. A. Gapienko G. S. Gres’ V. N. Ilyushin M. A. Prudkoglyad A. F. Pryanikov D. S. Romanovskii V. A. Semak A. A. Solodovnikov I. P. Terekhov V. I. Ukhanov M. N. Shimanskii S. S. 《JETP Letters》2020,111(5):251-254
JETP Letters - The first data on the yield of the lightest nuclear fragments (protons p, deuterons d, and tritons t) with high transverse momenta pT at an angle of 40° in the laboratory... 相似文献
90.
G. D. Ilyushin 《Russian Journal of Inorganic Chemistry》2011,56(13):2070-2104
The current state of ideas concerning the self-organization of crystal-forming systems where long-range order spontaneously
appears in the arrangement of nanolevel structural units of any nature (micro- and macromolecules or atomic clusters) that
initially existed in a dynamic state as a chaotic mixture is considered. Three partially overlapping stages of self-organization
of a system accepted in physical models of “order-disorder” kinetic transitions are matched to those used in supramolecular
chemistry. An algorithmically constructed model of transition from disordered to hierarchically ordered systems is considered.
The geometrical and topological modeling of density fluctuations of n-atomic species (clusters) An in a crystal-forming medium is carried out. A specific set of An clusters with block-diagonal connectivity matrices is recognized. These types of clusters (S
30), having “sectional” or “hierarchic” partition, are defined as precursors of crystal structures that are capable of evolving
most rapidly to give rise to a long-range order in structures. For an S
30 ring cluster shaped as a triangle, geometrical and topological modeling is carried out for all of the eight topologically
and symmetrically possible types of S
31 primary chains built of S
30 using theory of one-dimensional symmetry groups. Thirty three structural variants of morphologically and topologically different
types of S
32 micronets described by two-dimensional groups of symmetry are considered. Algorithms are presented for combinatorial and
topological analysis to search for precursor clusters and restore a three-dimensional net of covalent and noncovalent bonds
in a crystal structure by the matrix (cluster) self-assembly mechanism. The model advanced is universal. Examples of self-assembly
of a series of cluster-assembled structures of AB2 alloys of the unique Friauf-Laves family (which counts in 1400 of binary and ternary compounds) are given: for MgCu2 (cF24) (with its superstructures of ZrCu
5
and MgSnCu4 types), MgZn2 (hP12), and MgNi2 (hP24) (from AB2 or A2B + B3 three-atom clusters); for ZrZn22 icosahedral structures (from a suprapolyhedral cluster built of a ZrZn16 Friauf polyhedron and two ZnZn12 icosahedra); NaCd2 (from one A cluster with 61 atoms and two B clusters with 63 atoms); and for a bimolecular compound C78H30 (which is formed of fullerene C60 and a C28H30 molecule). The scenario of formation of self-curving nets with icosahedral symmetry is considered: to form a B12 icosahedron from two isomers with n = 3, a C20 dodecahedron from two isomers with n = 5, and C60 fullerene from pentagonal clusters with n = 5. 相似文献