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141.
142.
E. A. Asabina V. I. Pet’kov A. V. Markin N. N. Smirnova 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2009,83(7):1078-1083
The temperature dependence of the heat capacity of crystalline pentasodium hafnium tris(phosphate) was studied over the temperature range 6–650 K. The experimental data were used to calculate the thermodynamic functions of Na5Hf(PO4)3 from 0 to 650 K and the fractal dimension at 20–50 K. The standard entropy of formation from simple substances at 298.15 K was calculated from the absolute entropy value. The thermodynamic properties of Na5M(PO4)3 (M = Ti, Zr, and Hf) phosphates were compared. 相似文献
143.
N. N. Smirnova I. A. Letyanina A. V. Markin V. N. Larina V. V. Sharutin O. V. Molokova 《Russian Journal of General Chemistry》2009,79(4):717-723
Heat capacity of tetraphenylantimony benzophenoxymate Ph4SbONCPh2 is measured for first time using adiabatic calorimeter in the range from 6K to 350K and differential scanning calorimeter in the range from 330 K to 450 K. In the range of 400–450 K is revealed a melting accompanied with partial decomposition of the substance. Standard thermodynamic functions of crystalline Ph4SbONCPh2 in the range from T → 0 K to 440 K are calculated. Enthalpy of combustion of this compound is measured in a combustion calorimeter with isothermal cover and static bomb. Standard thermodynamic formation functions of crystalline Ph4SbONCPh2 at 298.15 K are calculated. Fractal dimension D is revealed. 相似文献
144.
Aleksandr Knyazev Miros?aw M?czka Nataliya Kuznetsova Jerzy Hanuza Aleksey Markin 《Journal of Thermal Analysis and Calorimetry》2009,98(3):843-848
In the present work temperature dependence of heat capacity of rubidium niobium tungsten oxide has been measured first in
the range from 7 to 395 K and then between 390 and 650 K, respectively, by precision adiabatic vacuum and dynamic calorimetry.
The experimental data were used to calculate standard thermodynamic functions, namely the heat capacity
^ (T), C_{\text{p}}^{\text{o}} (T), enthalpy
H\texto (T) - H\texto (0) H^{\text{o}} ({\rm T}) - H^{\text{o}} (0) , entropy
S\texto (T) - S\texto ( 0 ) S^{\text{o}} (T) - S^{\text{o}} \left( 0 \right) , and Gibbs function
G\texto (T) - H\texto (0) G^{{^{\text{o}} }} ({\rm T}) - H^{{^{\text{o}} }} (0) , for the range from T→0 to 650 K. The high-temperature X-ray diffraction and the differential scanning calorimetry were used for the determination
of temperature and decomposition products of RbNbWO6. 相似文献
145.
A.A. Balakin E.A. Buido M.I. Markin L.I. Novikova M.A. Baldwin 《Journal of Electrostatics》2010,68(1):96-100
An approach to the generation of gas phase ions by field extraction from liquid solutions has been investigated. The method uses a polymer membrane with nano-size channels as an interface between the liquid and the atmospheric pressure gas. Ions are produced by dissociation in the polar solvent and secondary ion-molecular reactions in the solution, which fills the channels of the membrane. Field extraction of the ions from the channels is stimulated by pulses of the electric discharge between the membrane and an adjacent electrode in the gas. The gas-phase ions are removed from the extraction zone by air flow and are detected by mass spectrometry. Possibilities of the membrane interface for generation of gas phase ions have been demonstrated from mass spectral investigation curried out for angiotensin II, gramicidin S and cytochrome C solutions. The current kinetics of the membrane ion source has been investigated to elucidate the mechanism of the ion extraction. 相似文献
146.
A. V. Markin N. N. Smirnova A. G. Lyapin M. V. Kondrin 《Physics of the Solid State》2006,48(5):1016-1021
The temperature dependence of the heat capacity at a constant pressure C p 0 = f(T) for the dimerized phase of the C60 fullerene in the temperature range 300–575 K and the thermodynamic characteristics for depolymerization of this phase under normal pressure are investigated using precision differential scanning calorimetry. It is established that thermal depolymerization is a kinetically hindered process. The final products of thermal depolymerization are identified as a partially crystalline monomer face-centered cubic phase of C60 with a degree of crystallinity α = 67 mol %. The results obtained in this study and our previous experimental data on the low-temperature heat capacity are used in the calculations of standard thermodynamic functions for the (C60)2 crystalline dimer, namely, the heat capacity C p 0 (T), the enthalpy H 0(T) ? H 0(0), the entropy S 0(T), and the Gibbs function G 0(T) ? H 0(0) in the temperature range from T → 0 to 394 K. 相似文献
147.
A. V. Markin O. V. Shestakov 《Moscow University Computational Mathematics and Cybernetics》2010,34(1):22-30
The paper considers the thresholding of coefficients in the expansion of a signal function on a wavelet basis. The approximate
relations between theoretical risk and its estimate through soft and hard thresholdings with the universal threshold choice
are given. 相似文献
148.
Markin A. V. Smirnova N. N. Lebedev B. V. Davydov V. A. Kashevarova L. S. Rakhmanina A. V. 《Russian Chemical Bulletin》2003,52(4):862-868
The temperature dependences of the heat capacity C
p° = f(T) were studied in an adiabatic vacuum calorimeter for the orthorhombic, tetragonal, and rhombohedral polymeric C60 phases in the 7—340 K temperature interval with an error of 0.2%. Comparative analysis of C
p° of these phases formed by stacking of one-dimensional and two types of two-dimensional polyfullerenes C60, was performed, and their fractal dimensionalities D were determined for temperatures below 50 K. The thermodynamic functions of the crystalline polymeric C60 phases were calculated in the temperature region from O 0 to 340 K: C
p°(T), H°(T) — H°(0), S°(T) — S°(0), and G°(T) — H°(0). Assuming that S°(0) = 0, the standard entropies of formation f
S° of these phases from graphite at T = 298.15 K and standard pressure were calculated. In addition, the entropies of transformation of the initial face-centered cubic phase of fullerite C60 in the crystalline polymeric C60 phases and entropies of their interconversions under the same conditions were estimated. The thermodynamic characteristics of the polymeric C60 phases were reviewed. 相似文献
149.
A. G. Volkov V. S. Markin R. M. Leblanc M. I. Gugeshashvili B. Zelent G. Munger 《Journal of solution chemistry》1994,23(2):223-248
The photoelectrochemical, absorption and fluorescence properties of pheophytin a mono- and multilayers, deposited on optically transparent tin oxide electrodes and quartz slides were investigated. Spectra of photocurrents coincided with the absorption spectra of photosynthetic pigment in monolayers at the SnO2/solution interfaces. The anodic and cathodic photocurrents were measured at various electrode potentials. Effects of pH, electrode potentials, and concentration of redox reagents on the conversion of solar energy in monolayers on optically transparent electrodes are discussed. The absorption and fluorescence spectral characteristics, and fluorescence lifetime measurements of pheophytina in monolayers and thin films are also discussed in view of the aggregation properties of the photosynthetic pigment. The thermodynamics of adsorption of large amphiphilic compounds at the interface between two immiscible liquids is considered. The adsorption behavior of pheophytin a dissolved in different solvents is investigated. The thermodynamic parameters of pheophytin a adsorption at octane/water and benzene/water interfaces were determined.Presented at the Symposium, 76th CSC Congress, Sherbrooke, Quebec, May 30–June 3, 1993, honoring Professor Donald Patterson on the occasion of his 65th birthday. 相似文献
150.
A. V. Brikov A. N. Markin S. V. Sukhoverkhov V. A. Avramenko 《Doklady Physical Chemistry》2016,469(2):121-123
By the interaction of a water–glycol solution of poly(ethylene glycol) (PEG) with calcium chloride dihydrate, a gel was produced. It was determined that, below a certain shear rate, this gel is a Newtonian fluid; however, above a certain shear rate, which depends on the gel viscosity, the properties of this gel are anomalous: the gel flow instantaneously completely stops. The viscosity of the gels was found to exponentially increase with increasing concentration of the cross-linking metal at constant PEG concentration. The density of the gels linearly increases with increasing concentration of the cross-linking metal at constant PEG concentration. 相似文献