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51.
Hongwei Wu Weijie Chi Gleb Baryshnikov Bin Wu Yifan Gong Dongxiao Zheng Xin Li Yanli Zhao Xiaogang Liu Hans gren Liangliang Zhu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(13):4372-4377
Crystal‐state luminophores have been of great interest in optoelectronics for years, whereas the excited state regulation at the crystal level is still restricted by the lack of control ways. We report that the singlet‐triplet emissive property can be profoundly regulated by crystal conformational distortions. Employing fluoro‐substituted tetrakis(arylthio)benzene luminophores as prototype, we found that couples of molecular conformations formed during different crystallizations. The deformable carbon‐sulphur bond essentially drove the distortion of the molecular conformation and varied the stacking mode, together with diverse non‐covalent interactions, leading to the proportional adjustment of the fluorescence and phosphorescence bands. This intrinsic strategy was further applied for solid‐state multicolor emissive conversion and mechanoluminescence, probably offering new insights for design of smart crystal luminescent materials. 相似文献
52.
Uskova N. I. Charnaya E. V. Podorozhkin D. Yu. Baryshnikov S. V. Egorova I. V. Milinskiy A. Yu. 《Physics of the Solid State》2020,62(7):1195-1198
Physics of the Solid State - Room-temperature changes in the structure of a new diisopropylammonium chloride (C6H16ClN, DIPAC) molecular ferroelectric have been investigated by high-resolution... 相似文献
53.
A. V. Dmitriev V. G. Baryshnikov I. V. Markov V. A. Tverdislov 《Journal of Structural Chemistry》2005,46(4):603-607
By the example of gramicidine channel, a comparative analysis of different approximate representations (heavy atoms, polar protons, near-by atoms) of AMBER force field has been carried out to calculate the electrostatic potential distribution of ionic channels in biological membranes. The results obtained are compared with the potential computed in a full-atom representation. The use of approximate representations is shown to lead to estimated errors of the potential. 相似文献
54.
G. V. Baryshnikov B. F. Minaev V. A. Minaeva 《Russian Journal of General Chemistry》2011,81(3):576-585
The equilibrium geometry and energy parameters of the complexes of Ca2+ and Mg2+ with 5-methyl-2-thioxotiazolidin-4-one (methylidene rhodanine) and its anion in a 1:1 ratio in different conformations were calculated by the quantum-chemical method with the density functional theory on the level of hybrid functional B3LYP in the basis of atomic orbitals 6–31+G(d). The influence of metal ion size on the number of possible isomeric coordinations was indicated. The principles of stabilization and destabilization of the structures depending on their conformations al structure were described. Based on the calculated equilibrium geometry parameters of the complexes conformations the effect of complexation on the structure of rhodanine ligand was elucidated. In the framework of a polarizable continuum the relative stability of the possible tautomeric forms of methylidene rhodanine in water was investigated. A new structure of the methylidene rhodanine anion distinquished by a specific distribution of negative charge is suggested. 相似文献
55.
E. V. Stukova S. V. Baryshnikov E. V. Charnaya D. Michel C. Tien 《Bulletin of the Russian Academy of Sciences: Physics》2011,75(5):710-712
Variation of nanocrystalline NaNO2 properties was studied under the conditions of confined geometry by nonlinear dielectric spectroscopy. It was shown that
a decrease in the pore size of silicate matrices MCM-41 filled with NaNO2 leads to an increase of nonlinearity and a change in the shape of the curves of the third harmonic amplitude as a function
of temperature. 相似文献
56.
V. Ryzhii N. Ryabova M. Ryzhii N. V. Baryshnikov V. E. Karasik V. Mitin T. Otsuji 《Opto-Electronics Review》2012,20(1):15-25
We consider new concepts of terahertz and infrared photodetectors based on multiple graphene layer and multiple graphene nanoribbon
structures and we evaluate their responsivity and detectivity. The performance of the detectors under consideration is compared
with that of photodetectors made of the traditional structures. We show that due to high values of the quantum efficiency
and relatively low rates of thermogeneration, the graphene-based detectors can exhibit high responsivity and detectivity at
elevated temperatures in a wide radiation spectrum and can substantially surpass other detectors. The detector being discussed
can be used in different wide-band and multi-colour terahertz and infrared systems. 相似文献
57.
V. S. Borisov Yu. V. Agrafonov L. A. Shcherbachenko Ya. V. Ezhova S. S. Baryshnikov O. B. Rubtsova 《Physics of the Solid State》2011,53(1):53-58
A theoretical model has been proposed which makes it possible to introduce the correction into the complex permittivity of
electrically active condensed systems that contain a polar liquid matrix and low-dimensional solid particles with a developed
electrically active surface. It has been established that there is an interfacial electrical interaction between surface charges
of the solid component and polar molecules of the liquid matrix. The processes occurring during this interaction lead to the
appearance of an intrinsic internal electric field in the system under investigation. The contribution from surface effects
to the formation of the polarized state of the polar liquid medium has been investigated in terms of the proposed model. The
possibility of controlling the processes of local change in the structure of the polar liquid component under the effect of
the internal electric field by varying the electrically active specific surface area of the solid phase and the intrinsic
dipole moment of molecules of the liquid matrix has been analyzed in the studied systems. The conditions providing for the
appearance of a controlled potential gradient of the internal electric field have been determined for the dispersed systems
under consideration. The parameter that makes it possible to evaluate the contribution from the interfacial electrical contact
interaction to the dielectric response of the liquid component and the entire system has been introduced for the first time. 相似文献
58.
L. A. Shcherbachenko N. T. Maksimova S. S. Baryshnikov V. A. Karnakov S. D. Marchuk L. I. Ezhova 《Physics of the Solid State》2011,53(7):1492-1498
Strong electrical forces have been revealed in electrically active heterogeneous finely dispersed systems at the interfaces
between the solid and liquid phases. It has been established that these forces give rise to gradients of the potential of
an internal self-electric field that can provide circulation of electric currents in the systems under investigation. It has
been found that, in these systems, there arises a double electric layer that represents a new structuring phase, which is
characteristic of electrically active systems only. The mechanism of formation of a double electric layer includes electrocontact
interaction between the surfaces of two heterogeneous liquid and solid polar dielectrics. 相似文献
59.
Stephan K. Pedersen Kristina Eriksen Nataliya N. Karaush‐Karmazin Boris Minaev Hans gren Gleb V. Baryshnikov Michael Pittelkow 《Angewandte Chemie (International ed. in English)》2020,59(13):5144-5150
We present a high‐yielding intramolecular oxidative coupling within a diazadioxa[10]helicene to give a dihydro‐diazatrioxa[9]circulene. This is the first [n]circulene containing more than eight ortho‐annulated rings (n>8). The single‐crystal X‐ray structure reveals a tight columnar packing, with a proton from a pendant naphthalene moiety centred directly above the central nine‐membered ring. This distinct environment induces a significant magnetic deshielding effect on that particular proton as determined by 1H NMR spectroscopy. The origin of the deshielding effect was investigated computationally in terms of the NICS values. It is established that the deshielding effect originates from an induced paratropic ring current from the seven aromatic rings of the [9]circulene structure, and is not due to the nine‐membered ring being antiaromatic. UV/Vis spectroscopy reveals more efficient conjugation in the prepared diazatrioxa[9]circulene compared to the parent helical azaoxa[10]helicenes, and DFT calculations, including energy levels, confirm the experimental observations. 相似文献
60.
S. V. Baryshnikov E. V. Charnaya A. Yu. Milinskiy Yu. V. Patrushev 《Physics of the Solid State》2013,55(12):2566-2570
This paper reports on a comparative study of phase transitions in nanocomposites made up of KNO3 embedded in 10-μm-thick MCM-41 films with unidirectional pores 4.0 nm in size on an aluminum substrate and of nanocomposites prepared in the form of potassium-nitrate-filled pressed MCM-41 powders with 3.7-nm pores. The temperature dependences of linear permittivity and the amplitude of third harmonic generation have been measured under heating and cooling. The structural transition from phase II to phase I shifts under heating relative to that occurring in bulk KNO3 toward lower temperatures for potassium nitrate in the film and toward higher temperatures for the pressed MCM-41-based nanocomposite. A significant difference has been observed also within the region of existence of ferroelectric phase III. The data obtained suggest that the shifts of phase transition temperatures observed in the conditions of nanoconfinement are influenced markedly not only by pore size and geometry but also by other factors. 相似文献