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111.
B. S. Kaverin A. M. Obiedkov S. Yu. Ketkov K. V. Kremlev N. M. Semenov S. A. Gusev D. A. Tatarskiy P. A. Yunin I. V. Vilkov M. A. Faddeev 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2018,12(4):682-687
Re–W nanoparticles are deposited onto multiwalled carbon nanotubes by the metal organic chemical vapor deposition technique. A mixture of dirhenium decacarbonyl and tungsten hexacarbonyl is used as a precursor. Nanoparticles of hybrid materials are studied by scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray phase analysis. It is found that in a wide range of ratios of the precursors (dirhenium decacarbonyl and tungsten hexacarbonyl), the crystalline component is a Re–W phase, and the morphology of the nanoparticles is the same as that of the nanodendrites. 相似文献
112.
N. S. Ginzburg E. R. Kocharovskaya M. N. Vilkov A. S. Sergeev 《Journal of Experimental and Theoretical Physics》2017,124(1):41-48
The mechanisms of passive mode locking and formation of ultrashort pulses in microwave electron oscillators with a bleaching absorber in the feedback loop have been analyzed. It is shown that in the group synchronism regime in which the translational velocity of particles coincides with the group velocity of the electromagnetic wave, the pulse formation can be described by the equations known in the theory of dissipative solitons. At the same time, the regimes in which the translational velocity of electrons differs from the group velocity and the soliton being formed and moving along the electron beam consecutively (cumulatively) receives energy from various electron fractions are optimal for generating pulses with the maximal peak amplitudes. 相似文献
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115.
Jozef Gonda Miroslav Psotka Miroslava Martinková Simona Fazekašová Tatiana Mitríková Mária Vilková 《Tetrahedron letters》2018,59(52):4620-4621
The reaction of (2S,3S,4R)-2,3,4,7-tetrahydroxy-6-oxoheptanals with lower alcohols produced protected 3-deoxy-d-arabino-2-heptulosonates. The key transformation is based on an 1,4-O–O silyl group migration, followed by 6-exo-trig cyclisation to give the final pyranose. 相似文献
116.
Simpson DC Ahn S Pasa-Tolic L Bogdanov B Mottaz HM Vilkov AN Anderson GA Lipton MS Smith RD 《Electrophoresis》2006,27(13):2722-2733
Bottom-up proteomics (analyzing peptides that result from protein digestion) has demonstrated capability for broad proteome coverage and good throughput. However, due to incomplete sequence coverage, this approach is not ideally suited to the study of modified proteins. The modification complement of a protein can best be elucidated by analyzing the intact protein. 2-DE, typically coupled with the analysis of peptides that result from in-gel digestion, is the most frequently applied protein separation technique in MS-based proteomics. As an alternative, numerous column-based liquid phase techniques, which are generally more amenable to automation, are being investigated. In this work, the combination of size-exclusion chromatography (SEC) fractionation with RPLC-Fourier-transform ion cyclotron resonance (FTICR)-MS is compared with the combination of RPLC fractionation with CIEF-FTICR-MS for the analysis of the Shewanella oneidensis proteome. SEC-RPLC-FTICR-MS allowed the detection of 297 proteins, as opposed to 166 using RPLC-CIEF-FTICR-MS, indicating that approaches based on LC-MS provide better coverage. However, there were significant differences in the sets of proteins detected and both approaches provide a basis for accurately quantifying changes in protein and modified protein abundances. 相似文献
117.
The dispersion properties of electroacoustic wave modes confined by a superlattice of uniformly moving 180° domain walls in
a tetragonal ferroelectric crystal are considered. It is shown that the manifold of partial electroacoustic interfacial waves
in the lattice is restricted to the first allowed band, the configuration of which in the plane of spectral variables can
significantly vary under the action of the moving domain walls. 相似文献
118.
A. A. Anosov R. V. Belyaev V. A. Vilkov A. S. Kazanskii A. D. Mansfel’d A. S. Sharakshané 《Acoustical Physics》2009,55(4-5):454-462
Two- and three-dimensional dynamic acoustothermography is carried out in model experiments. The temperature of the model plasticine objects was determined from the measurements of their thermal acoustic radiation in the course of their heating and cooling. The measurements were performed with the use of a planar array of 14 acoustothermometers and two planar arrays perpendicular to each other with 7 acoustothermometers in each of them. The results of measurements were used to plot a dynamic map of the temperature of acoustic brightness and to reconstruct the dynamics of variations in the parameters of the temperature distribution: the spatial coordinates of the heated region, its characteristic size and, maximal temperature. The duration of one measurement cycle was 10 s, the error in determining the position of the center and the size of the heated region did not exceed 1 mm, and the accuracy of the temperature’s calculation was about 1 degree. The results of the study may be used for controlling the temperature in the course of medical procedures that include heating of internal tissues in human patients. 相似文献
119.
120.
A. A. Anosov R. V. Belyaev V. A. Vilkov M. V. Dvornikova V. V. Dvornikova A. S. Kazanskii N. A. Kuryatnikova A. D. Mansfel’d 《Acoustical Physics》2012,58(5):542-548
In a model experiment using the acousto-thermographic method, deep temperature profiles varying in time are recovered. In the recovery algorithm, we used a priori information in the form of a requirement that the calculated temperature must satisfy the heat conduction equation. The problem is reduced to determining two parameters: the initial temperature and the temperature conductivity coefficient of the object under consideration (the plasticine band). During the experiment, there was independent inspection using electronic thermometers mounted inside the plasticine. The error in the temperature conductivity coefficient was about 17% and the error in initial temperature determination was less than one degree. Such recovery results allow application of this approach to solving a number of medical problems. It is experimentally proved that acoustic irregularities influence the acousto-thermometric results as well. It is shown that in the chosen scheme of experiment (which corresponds to measurements of human muscle tissue), this influence can be neglected. 相似文献