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201.
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204.
Summary
-Trialkylsilylpropargyl and allyl alcohols, and also propargyloxysilanes were synthesized from propargyl alcohol. 相似文献
205.
206.
A. Ya. Korets A. S. Krylov E. V. Mironov 《Russian Journal of Physical Chemistry B, Focus on Physics》2010,4(5):793-796
Raman backscattering spectra (RBS), infrared spectra, and X-ray diffraction intensity curves for various fractions of ultradispersed
diamond-containing material (UDDCM) were recorded. The RBS and XRD curves obtained suggest that UDDCM is characterized by
sharp variations in the ratio between the diamond and nondiamond components, a factor that makes it possible to consider this
phase as an individual product and determines the scale of variations in the main characteristics. Fine UDDCM fractions contain
only small amounts diamond-like (sp
3 carbon) grains, if any. One possible reason for changes in the ratio between the phases is density fluctuations under nonequilibrium
conditions of synthesis. 相似文献
207.
V. M. Yermachenko Yu. A. Vdovin V. D. Mironov N. V. Naumov V. N. Petrovskiy N. M. Prokopova V. I. Polsky P. S. Dzhumaev V. L. Yakushin 《Laser Physics》2010,20(6):1537-1544
The effect of the radiation of the pulsed fiber laser on the surfaces of cylindrical samples made of the VT16 titanium alloy is studied. It is demonstrated that the irradiation at appropriate parameters of the laser radiation in the inert-gas (argon) atmosphere leads to an increase in the microhardness of the surface layer and a decrease in the surface roughness of the irradiated samples by a factor of five in comparison with the roughness of the original samples. 相似文献
208.
B. N. Mironov S. A. Aseev S. V. Chekalin V. F. Ivanov O. L. Gribkova 《JETP Letters》2010,92(11):779-782
A conducting organic polymer is visualized on a laser photoelectron projection microscope, which is based on Letokhov’s concept
and has a nanometer spatial resolution. Photoelectron images of polyaniline (which is the most promising representative of
conducting polymers) with a magnification of ∼105 have been obtained when a 100-nm quartz capillary coated with a film of this material was irradiated by femtosecond laser
pulses. The projection photoelectron method using 400- and 800-nm laser radiation has made it possible to directly reveal the existence of the redox heterogeneity of the organic polymer, which is due to the contact of the sections of polyaniline
with different oxidation degrees and strongly affects the electric conductivity of the sample. 相似文献
209.
A two-dimensional periodic Schrödingier operator is associated with every Lagrangian torus in the complex projective plane \({\mathbb C}P^2\). Using this operator, we introduce an energy functional on the set of Lagrangian tori. It turns out this energy functional coincides with the Willmore functional \(W^{-}\) introduced by Montiel and Urbano. We study the energy functional on a family of Hamiltonian-minimal Lagrangian tori and support the Montiel–Urbano conjecture that the minimum of the functional is achieved by the Clifford torus. We also study deformations of minimal Lagrangian tori and show that if a deformation preserves the conformal type of the torus, then it also preserves the area, i.e., preserves the value of the energy functional. In particular, the deformations generated by Novikov–Veselov equations preserve the area of minimal Lagrangian tori. 相似文献
210.
P. G. Grinevich A. E. Mironov S. P. Novikov 《Theoretical and Mathematical Physics》2010,164(3):1110-1127
We study the manifold of complex Bloch-Floquet eigenfunctions for the zero level of a two-dimensional nonrelativistic Pauli
operator describing the propagation of a charged particle in a periodic magnetic field with zero flux through the elementary
cell and a zero electric field. We study this manifold in full detail for a wide class of algebraic-geometric operators. In
the nonzero flux case, the Pauli operator ground state was found by Aharonov and Casher for fields rapidly decreasing at infinity
and by Dubrovin and Novikov for periodic fields. Algebraic-geometric operators were not previously known for fields with nonzero
flux because the complex continuation of “magnetic” Bloch-Floquet eigenfunctions behaves wildly at infinity. We construct
several nonsingular algebraic-geometric periodic fields (with zero flux through the elementary cell) corresponding to complex
Riemann surfaces of genus zero. For higher genera, we construct periodic operators with interesting magnetic fields and with
the Aharonov-Bohm phenomenon. Algebraic-geometric solutions of genus zero also generate soliton-like nonsingular magnetic
fields whose flux through a disc of radius R is proportional to R (and diverges slowly as R → ∞). In this case, we find the
most interesting ground states in the Hilbert space L
2
(ℝ
2
). 相似文献