全文获取类型
收费全文 | 98篇 |
免费 | 0篇 |
专业分类
化学 | 6篇 |
晶体学 | 3篇 |
力学 | 13篇 |
数学 | 1篇 |
物理学 | 75篇 |
出版年
2020年 | 2篇 |
2019年 | 9篇 |
2018年 | 6篇 |
2017年 | 3篇 |
2016年 | 4篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 4篇 |
2012年 | 6篇 |
2011年 | 7篇 |
2010年 | 7篇 |
2009年 | 4篇 |
2008年 | 1篇 |
2007年 | 6篇 |
2006年 | 4篇 |
2005年 | 1篇 |
2004年 | 3篇 |
2003年 | 2篇 |
2002年 | 5篇 |
2001年 | 3篇 |
1999年 | 4篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1976年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有98条查询结果,搜索用时 9 毫秒
1.
I. N. Flerov V. D. Fokina M. V. Gorev A. D. Vasiliev A. F. Bovina M. S. Molokeev A. G. Kocharova N. M. Laptash 《Physics of the Solid State》2006,48(4):759-764
Precision studies of the thermophysical properties and structure of an (NH4)2WO2F4 crystal have been performed. It was established reliably that there is a sequence of two phase transitions at T 1 = 201 K and T 2 = 160 K characterized by wedging out of an intermediate phase with an increase in pressure. The role of tetrahedral and octahedral ionic groups in the mechanism of the structural transitions was determined. 相似文献
2.
O. V. Goreva A. I. Illarionov D. V. Gorev 《Bulletin of the Russian Academy of Sciences: Physics》2016,80(1):28-31
Mechanisms of the frequency conversion of broadband infrared laser radiation in a uniaxial crystal with the radiation focused by a lens with spherical aberration are investigated. A mathematical model is presented. Computer modeling of the spatial–angular structures of frequency-converted focused broadband infrared radiation is performed. 相似文献
3.
I. N. Flerov M. V. Gorev M. L. Afanas’ev T. V. Ushakova 《Physics of the Solid State》2002,44(10):1961-1966
The heat capacity of partially deuterated crystals with a cryolite structure, namely, (NH4)3ScF6 and (NH4)3GaF6, is measured in the temperature range from 80 to 370 K. The p-T phase diagrams of these compounds are investigated at pressures up to p=0.6 GPa. It is revealed that the deuteration does not affect the sequences of phase transitions observed in the proton-containing ammonium cryolites studied earlier. The isotope effect most clearly manifests itself in significant changes in the thermodynamic parameters of the $I12/m1 - P\bar 1$ low-temperature transformation in scandium cryolite. 相似文献
4.
M. V. Gorev V. S. Bondarev I. N. Flerov Ph. Sciau J. -M. Savariault 《Physics of the Solid State》2005,47(12):2304-2308
The temperature dependence of the heat capacity of two compositions in the solid solution system BaTi1?xZrxO3 (x = 0.25, 0.35) was measured using adiabatic calorimetry. In the T-x phase diagram, these compounds occupy positions near the crossover from conventional ferroelectric behavior to the relaxor state. Both compounds reveal diffuse heat capacity anomalies: two anomalies in the temperature ranges 250–350 and 150–200 K at x = 0.35 and one anomaly within the range ~150–320 K at x = 0.25. The results obtained are discussed together with structural and dielectric measurements. 相似文献
5.
I. N. Flerov M. V. Gorev K. S. Aleksandrov A. Tressaud V. D. Fokina 《Crystallography Reports》2004,49(1):100-107
The ferroelastic phase transitions are investigated in several series of fluoride crystals belonging to the elpasolite and cryolite families (space group \(Fm\bar 3m\)) with the general formula A2BB′ F6. The influence of the size and shape of cations and anions on the entropy and the mechanism of structural distortions is discussed. 相似文献
6.
B. V. Gorev I. D. Klopotov T. É. Zakharova 《Journal of Applied Mechanics and Technical Physics》1995,36(1):143-150
Novosibirsk. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, No. 1, pp. 149–157, January–February, 1995. 相似文献
7.
Structural phase transitions in RbxK1−x
LiSO4 mixed crystals (with x varying from 0 to 1) have been studied from the melting point to liquid-nitrogen temperature. Calorimetric (DTA and DSM)
data, birefringence and optical polarization measurements were used to construct the full phase (T-x) diagram. It has been established that crystals of most compositions (x⩽0.95) grow in the hexagonal-trigonal KLiSO4 structure. Replacement of K by the larger Rb atom results in a considerable increase of the region of existence of the P31c phase and expulsion of the high-temperature hexagonal phase.
Fiz. Tverd. Tela (St. Petersburg) 40, 1341–1344 (July 1998) 相似文献
8.
Under conditions of a model experiment in nonswept-wing boundary layer, forerunner wave packets were obtained in the flow
regions preceding the fronts of streaky structures. A model to describe the formation and development of the fronts is proposed.
An external-flow pressure gradient is shown to be a necessary condition for forerunner growth. Besides, the spatial geometry
of the forerunners and the evolution of this geometry in the course of downstream development of the wave packet were studied. 相似文献
9.
S. S. Aplesnin O. N. Bandurina L. I. Ryabinkina O. B. Romanova E. V. Eremin M. V. Gorev A. M. Vorotynov D. A. Balaev A. D. Vasil’ev A. I. Galyas O. F. Demidenko G. I. Makovetskii K. I. Yanushkevich 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(5):708-710
The coefficients of thermal expansion, lattice constant, and magnetization of anion-substituted MnSe1 - xTex chalcogenides were measured upon cooling in zero and nonzero magnetic fields in the temperature range 4.2–600 K. Resistivity as a function of magnetic field up to 1 T was measured. The dynamic properties of the materials were studied by the ESR method. Magnetoresistance and temperature hysteresis were found in MnSe1 - xTex solid solutions. 相似文献
10.
M. V. Gorev E. V. Bogdanov I. N. Flerov A. G. Kocharova N. M. Laptash 《Physics of the Solid State》2010,52(1):167-175
The thermal expansion along the principal crystallographic axes of the (NH4)2WO2F4 and (NH4)2MoO2F4 oxyfluorides has been studied. The anomalous behavior of α
i
(T) due to the phase transitions has been revealed at T
1 = 271.4 K and T
2 ≈ 180 K for the molybdate and at T
1 = 201.5 K and T
2 ≈ 161 K for the tungstate. The quantities dT/dp and dT/dσ
i
, which characterize the dependence of the phase transition temperatures on the hydrostatic and uniaxial pressures, have been
determined from analyzing the results of studies of the thermal expansion and heat capacity with the use of the Pippard relations.
The p-T and α
i
-T phase diagrams reflect different characters of the influence of the pressure on the stability of the initial and distorted
phases of the oxyfluorides. The magnitudes of the extensive and intensive barocaloric effects determined in the vicinity of
the structural phase transitions are as follows: ΔS
BCE varies from approximately −10 to −17 J/mol K and ΔT
AD ≈ 8−17 K for the molybdate and ΔS
BCE varies from approximately −10 to −17 J/mol K and ΔT
AD ≈ 8−13 K for the tungstate. 相似文献