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11.
We have observed that carbon deposits obtained by atomizing graphite in an electric arc in an atmosphere of argon and helium
exhibit porosity and possess fractal structure. The results of measurements of the internal friction Q
−1 and the effective Young’s modulus E as a function of temperature are presented. Data on the resistivity, density, and microhardness of the carbon deposits are
presented. A possible mechanism for formation of fractal structures in carbon deposits is discussed.
Fiz. Tverd. Tela (St. Petersburg) 40, 584–586 (March 1998) 相似文献
12.
The intensity and polarization pattern of circularly and linearly polarized Gaussian beams transformed by the effect of conical diffraction in a biaxial crystal has been studied experimentally, and compared with the predictions of paraxial theory. Some general regularities in the relative intensity and geometry of beam structures were analyzed. The formation of Mathieu beam profiles from linearly polarized input beams was demonstrated. 相似文献
13.
I. V. Zolotukhin S. V. Spitsina L. I. Yanchenko L. N. Korotkov 《Physics of the Solid State》1999,41(11):1891-1893
Macroscopic fractal aggregates of KH2PH4 (KDP) measuring up to 500 μm have been obtained. The fractal structure forms as a result of the precipitation of KDP particles
from a supersaturated aqueous solution in the presence of a temperature gradient followed by a diffusioncontrolled mechanism
of aggregation. The electron-microscopic analysis performed has shown that the fractals are formed predominantly from crystallites
of the tetragonal modification measuring ∼1 μm. The dielectric constant (ɛ) of fractal KH2PO4 has been measured in the temperature range 80–300 K. A characteristic anomaly has been discovered on the ɛ(T) curve in the vicinity of 122 K, which attests to a ferroelectric phase transition. The absolute value of ɛ is significantly smaller than the components ɛ
11 and ɛ
33 for KH2PO4.
Fiz. Tverd. Tela (St. Petersburg) 41, 2059–2061 (November 1999) 相似文献
14.
S. L. Zolotukhin V. K. Kosenyuk 《Journal of Applied Mechanics and Technical Physics》1990,31(2):320-326
Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 2, pp. 164–170, March–April, 1990. 相似文献
15.
16.
17.
Zolotukhin M Fomine S Salcedo R Khalilov L 《Chemical communications (Cambridge, England)》2004,(8):1030-1031
Reaction of carbonyl compounds bearing electron-withdrawing substituents with non-activated aromatic hydrocarbons proceeds selectively in trifluoromethanesulfonic acid (TFSA) at room temperature to give linear, high-molecular-weight polymers. 相似文献
18.
Macroscopic fractal aggregates of cobalt are obtained by thermal evaporation of cobalt metal in an argon atmosphere and subsequent
deposition on a silicon substrate heated to 1000 K. It is established that the fractal structure is formed by diffusion-limited
aggregation of cobalt particles. The macroscopic fractal cobalt aggregates are ferromagnetic.
Pis’ma Zh. éksp. Teor. Fiz. 66, No. 8, 556–558 (25 October 1997) 相似文献
19.
20.
N. V. Grevtsev V. D. Zolotukhin Yu. M. Kashurnikov V. A. Letyagin 《Journal of Applied Mechanics and Technical Physics》1974,15(1):132-133
In the transient mode of the electrical explosion of a copper wire a redistribution of the explosion products takes place during the escape of the particles. This observation is confirmed by high-speed optical photographs and also by reference to the appearance of the deposited film. 相似文献