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71.
72.
K.V. Yumashev V.G. Savitski N.V. Kuleshov A.A. Pavlyuk D.D. Molotkov A.L. Protasenya 《Applied physics. B, Lasers and optics》2007,89(1):39-43
A comparative study of the flash-lamp pumped laser performance of standard b-grown Nd:KGW and Nd:KGW grown for propagation
along the optical axis Ng is presented. The results show that, in comparison with b-grown crystal, the Ng-grown Nd:KGW is very promising for use at high repetition flash-lamp pumping rates. With the same laser cavity configuration,
the Ng-grown Nd:KGW can operate at an average flash-lamp input power of at least 1.4 kW, while the b-cut one ceases lasing at average
flash-lamp input power of ∼0.5 kW. The reason for this is that the thermal lens induced in the Ng-oriented Nd:KGW rod under pump radiation is relatively weak, nearly spherical and positive, whereas the b-grown Nd:KGW rod
acts as a quite weak positive lens for radiation with radial polarization, and as a much stronger negative lens for tangentially
polarized radiation.
PACS 42.60.Jf; 42.70.Hj 相似文献
73.
74.
Volodymyr Pavlyuk Viktoriya Milashys Grygoriy Dmytriv Helmut Ehrenberg 《Acta Crystallographica. Section C, Structural Chemistry》2015,71(1):39-43
The ternary dilithium diboron carbide, Li2B2C (tetragonal, space group Pm2, tP10), crystallizes as a new structure type and consists of structural fragments which are typical for structures of elemental lithium and boron or binary borocarbide B13C2. The symmetries of the occupied sites are .m. and 2mm. for the B and C atoms, and m2 and 2mm. for the Li atoms. The coordination polyhedra around the Li atoms are cuboctahedra and 15‐vertex distorted pseudo‐Frank–Kasper polyhedra. The environment of the B atom is a ten‐vertex polyhedron. The nearest neighbours of the C atom are two B atoms, and this group is surrounded by a deformed cuboctahedron with one centred lateral facet. Electronic structure calculations using the TB–LMTO–ASA method reveal strong B...C and B...B interactions. 相似文献
75.
Asymptotic analysis of the problem describing deformation ofa thin cylindrical plate with clamped lateral side is performed.The problem is considered under the most general statement withthe plate being laminated and consisting of an arbitrary numberof nonhomogeneous and anisotropic (21 elastic moduli) layers.Explicit integral representations of the differential operatorswhich form the two-dimensional model of the plate are derived.In the case when the elastic moduli of each of the layers areconstant, these integral representations turn into algebraicones. The asymptotic procedure is justified with the help ofa weighted inequality of Korn's type. The error estimates obtainedgive a rigorous mathematical proof of both of Kirchhoff's hypotheses(kinematic and static) and shed light on the well-known intrinsicinconsistency of two of the hypotheses. 相似文献
76.
Shimanskii A. F. Podkopaev O. I. Pavlyuk T. O. Eremin D. V. Kravtsova E. D. 《Crystallography Reports》2018,63(7):1183-1186
Crystallography Reports - The effect of crystallization front shape on the dislocation density in Ge single crystals with a diameter of 100 mm, grown by the Czochralski method, has been studied.... 相似文献
77.
M. Yu. Luk’yanov A. V. Pavlyuk E. A. Goreshnik M. G. Mys’kiv 《Russian Journal of Coordination Chemistry》2012,38(9):639-645
Qualitative single crystals of ??-complexes Cu(H+L)(ClO4)]ClO4 · H2O (I), Cu(H+L)(BF4)]BF4 · H2O (II), and [Cu(H+L)(H2O)]SiF6 · H2O (III) are synthesized from solutions of 3-(diallylamino)propanenitrile (L) in propanol, ethanol, and methanol-water acidified with the corresponding acid to pH 3.5?C5 and from the copper(II) salts (Cu(ClO4)2 · 6H2O, Cu(BF4)2 · 6H2O, and CuSiF6 · 4H2O) using the alternating-current electrochemical method on copper wire electrodes. The crystal structures of the complexes are determined. All compounds crystallize in the monoclinic crystal system: complexes I and II are isostructural, space group P21/n, Z = 4. For compound III, space group P21/c, Z = 8. Unit cell parameters: for I a =7.8153(3), b = 16.7824(7), c = 12.4426(5) ?, ?? = 93.410(2)°, V = 1629.1(1) ?3; for II, a = 7.6755(4), b = 16.7119(7), c = 12.3784(6) ?, ?? = 94.354(2)°, V = 1583.2(1); and for III a = 9.826(2), b = 24.009(3), c = 12.061(2) ?, ?? = 91.820(6)°, V = 2843.9(7) ?3. The trigonal pyramidal coordination of the copper atom in complexes I-III is formed by two C=C bonds of the allyl groups of H+L, the nitrile N atom of the adjacent cation of the ligand, and the O or F atom of the ClO 4 ? or BF 4 ? anions. In structure III, the apical position of the pyramid is occupied by the O atom of the water molecule, since the SiF 6 2? anion is considerably remote from the copper(I) atom. However, this anion is bound to the organic cation by hydrogen bonds F??H (2.05?C2.51 ?). 相似文献
78.
The title compound is prepared from the elements (670 K, 3 d; annealing at 1070 K, 3 h) and its structure is determined by single crystal XRD. 相似文献
79.
Ihor Chumak Volodymyr Pavlyuk Grygoriy Dmytriv Hermann Pauly Helmut Ehrenberg 《ChemInform》2013,44(8):no-no
Li1.95Ag1.05In3 is prepared from the elements (Ta crucible, 1100 °C for 15 min followed by annealing at 150 °C for 1 month) and characterized by single crystal XRD and TB‐LMTO‐ASA computations. 相似文献
80.
Yu. I. Slyvka A. V. Pavlyuk B. R. Ardan N. T. Pokhodilo E. A. Goreshnik P. Yu. Demchenko 《Russian Journal of Inorganic Chemistry》2012,57(6):815-821
Copper(I) ??-complexes of the compositions [Cu(C12H13N5O)(NO3)] · 0.5H2O (1) and [Cu(C12H13N5O)(CF3COO)] (2) (C12H13N5O is N-allyl-5-amino-1-phenyl-1H-1,2,3-triazole-4-carboxamide) were obtained by alternating-current electrochemical synthesis, and their crystal structures were studied by X-ray crystallography. Crystals of the compounds are monoclinic, space group C2/c with the unit cell parameters a = 21.3976(15) ?, b = 8.0335(4) ?, c = 18.6027(13) ?, ?? = 114.422(2)°, V = 2911.6(3) ?3, Z = 8 for 1; and a = 18.3578(18) ?, b = 9.8700(10) ?, c = 20.9094(18) ?, ?? = 106.883(3)°, V = 3625.3(6) ?3, Z = 8 for 2. In both structures, N-allyl-5-amino-1-phenyl-1H-1,2,3-triazole-4-carboxamide acts as a bridging tridentate chelating ligand and forms with copper(I) atoms infinite chains containing [CuC4NO] seven-membered rings. The chains are linked to form a three-dimensional framework due to hydrogen bonds (N)H??O, which involve nitrogen atoms of amino and amide groups of the ligand. The coordination sphere of Cu(I) atoms consists of olefin bond of the allyl C=C group, O atom of the carbonyl group, N(3) atom of the triazole nucleus of the organic ligand, and an oxygen atom of nitrate (compound 1) or trifluoroacetate (compound 2) anion, respectively. 相似文献