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101.
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103.
Valiollah Mirkhani Reza Kia Dalibor Milić Akbar Rostami Vartooni Dubravka Matković-Čalogović 《Transition Metal Chemistry》2010,35(1):81-87
Four new Re(I) tricarbonyl-diimine complexes were prepared by reaction of Re(CO)5Cl with N,N′-bis(substituted benzylidene)ethane-1,2-diamine Schiff base ligands. These compounds were characterized by physico-chemical
methods, and their crystal structures were established by X-ray diffraction. The coordination geometry at the Re atom is that
of a distorted octahedron, with three carbonyl ligands in the facial geometry. 相似文献
104.
105.
Petr Chocholouš Kateřina Matoušová Dalibor Šatínský Lenka Kujovská Krčmová Hana Sklenářová 《Journal of separation science》2023,46(18):2300448
At the turn of the millennium, the monolithic columns invoked new chances in HPLC. Even more than their organic polymer-based siblings, the inorganic silica-based monoliths targeted the territory of classical fully porous particle-packed columns, promising many benefits. Based on the number of published articles, the monoliths attracted academics just in the first few years after their introduction to the market. Lately, as superficially porous particles and sub-2-micron fully porous particles dominated the market, they stayed in the focus of routine laboratories and those who really appreciated the high porosity of the monolithic bed. The monoliths' practical benefits cannot be easily traced in the literature when they gradually lose academics' interest. Nevertheless, after more than 20 years of our experience, we still favor silica monoliths for their low back pressure and longevity when analyzing samples of clinical, pharmaceutical, and environmental origin. At the same time, the high permeability of monoliths enabled the birth of sequential injection chromatography, the medium-pressure separation technique based on the flexible flow manifold. This minireview aims to check, discuss, and summarize the practical aspects of monolithic silica columns in HPLC and medium-pressure sequential injection chromatography (SIC) that may not be visible at first sight but are evident retrospectively. 相似文献
106.
Alexander M. Macmillan Dalibor Panek Colin D. McGuinness John C. Pickup Duncan Graham W. Ewen Smith David J. S. Birch Jan Karolin 《Journal of Sol-Gel Science and Technology》2009,49(3):380-384
By using the fluorescent dye 6-propionyl-2-(N,N-dimethylamino) naphthalene (PRODAN) to monitor methanol generated during tetramethyl orthosilicate polymerization we have
optimised the encapsulation of protein in silica sol–gel monoliths with respect to completion of hydrolysis and distillation
in order to remove methanol such that protein can be added without denaturation. A minimum of 24 h at +4 °C was found to be
required before hydrolysis is complete and 3–5 min of vacuum distillation at 50 °C and 300 mbar needed to remove methanol
before the gel is formed. The biocompatibility of a tetramethyl orthosilicate sol–gel monolith was demonstrated by preserving
the trimer protein allophycocyanin (APC) in its native form for up to 500 h. This obviates the previously essential requirement
of covalently binding the trimer together in order to prevent dissociation into monomers and has enabled observation of native
APC trimer in a sol–gel pore for the first time down to the single molecule level using combined fluorescence spectroscopy
and confocal microscopy. The higher stability afforded by the protocol we describe could impact on the application of sol–gel
materials to single-molecule studies of wider bearing such as protein folding and aggregation. 相似文献
107.
Lucie Nováková Sofía Arnal Lopéz Dalibor Šatínský Aleš Horna Petr Solich 《Talanta》2009,78(3):834-894
CAD (charged aerosol detector) has recently become a new alternative detection system in HPLC. This detection approach was applied in a new HPLC method for the determination of three of the major statins used in clinical treatment—simvastatin, lovastatin and atorvastatin.The method was optimized and the influence of individual parameters on CAD response and sensitivity was carefully studied. Chromatography was performed on a Zorbax Eclipse XDB C18 (4.6 mm × 75 mm, 3.5 μm), using acetonitrile and formic acid 0.1% as mobile phase. The detection was performed using both CAD (20 pA range) and DAD (diode array detector—238 nm) simultaneously connected in series. In terms of linearity, precision and accuracy, the method was validated using tablets containing atorvastatin and simvastatin.The CAD is designated to be a non-linear detector in a wide dynamic range, however, in this application and in the tested concentration range its response was found to be perfectly linear. The limits of quantitation (0.1 μg/ml) were found to be two times lower than those of UV detection. 相似文献
108.
Jurica Bauer Dalibor Mili Marina Modri 《Acta Crystallographica. Section C, Structural Chemistry》2009,65(10):o512-o516
Ethyl 1‐ethyl‐6‐iodo‐4‐oxo‐1,4‐dihydroquinoline‐3‐carboxylate, C14H14INO3, (I), and ethyl 1‐cyclopropyl‐6‐iodo‐4‐oxo‐1,4‐dihydroquinoline‐3‐carboxylate, C15H14INO3, (II), have isomorphous crystal structures, while ethyl 1‐dimethylamino‐6‐iodo‐4‐oxo‐1,4‐dihydroquinoline‐3‐carboxylate, C14H15IN2O3, (III), possesses a different solid‐state supramolecular architecture. In all three structures, O...I halogen‐bonding interactions connect the quinolone molecules into infinite chains parallel to the unique crystallographic b axis. In (I) and (II), these molecular chains are arranged in (101) layers, viaπ–π stacking and C—H...π interactions, and these layers are then interlinked by C—H...O interactions. The structural fragments involved in the C—H...O interactions differ between (I) and (II), accounting for the observed difference in planarity of the quinolone moieties in the two isomorphous structures. In (III), C—H...O and C—H...π interactions form (100) molecular layers, which are crosslinked by O...I and C—H...I interactions. 相似文献
109.
Višnja Vrdoljak Prof. Dalibor Milić Marina Cindrić Dubravka Matković‐Čalogović Jana Pisk Marina Marković Predrag Novak 《无机化学与普通化学杂志》2009,635(8):1242-1248
New dinuclear pentacoordinate molybdenum(V) complexes, [Mo2VO3L2] [L = thiosemicarbazonato ligand: C6H4(O)CH:NN:C(S)NHR′ and C10H6(O)CH:NN:C(S)NHR′; R′ = H, CH3, C6H5) were obtained either by oxygen atom abstraction from MoVIO2L with triphenylphosphine or by using [Mo2O3(acac)4] in the reaction with the corresponding ligands H2L. Crystal and molecular structure of [Mo2O3{C6H4(O)CH:NN:C(S)NHC6H5}2] · CH3CN has been determined by the single‐crystal X‐ray diffraction method. 相似文献
110.
Decomposition of complete graphs into (0, 2)-prisms 总被引:1,自引:0,他引:1
R. Frucht and J.Gallian (1988) proved that bipartite prisms of order 2n have an α-labeling, thus they decompose the complete graph K 6nx+1 for any positive integer x. We use a technique called the ? +-labeling introduced by S. I. El-Zanati, C. Vanden Eynden, and N. Punnim (2001) to show that also some other families of 3-regular bipartite graphs of order 2n called generalized prisms decompose the complete graph K 6nx+1 for any positive integer x. 相似文献