Abstract
In this paper, the synthesis of semiconductor spherical nanostructures is carried out by the plasma-chemical method. The sizes of the obtained nanospheres range from 100 nm to 1 mm. These ...structures are open on one side, have thin walls with a thickness of several nanometers, which end with “tentacles” with a diameter of several nanometers. Since the synthesis involved three elements of the fourth group of the periodic table (germanium, silicon, carbon), it has not yet been possible to determine the crystal structure of the obtained samples. All three elements are present on the surface of the sample in atomic percentages Ge-2.5%, Si-8%, C-55%. In addition to these elements, oxygen is also present in the spectrum.
Let X be a random variable taking positive integer values and let
P
{X = k} = θ(k). We consider the problem of estimation of the parameter θ = (θ(1), θ(2), . . . ) on the base of a sample X
1
,X
2
, .... . . , X
n
, where the observations X
j
are independent copies of X. Bibliography: 5 titles.
A study was carried out on the composition of an experimental modifying additive to a lignosulfonate drilling reagent using high‑performance liquid chromatography. IR spectrometry of the modifying ...additive revealed the functional groups of the intermediate and final products. The efficiency of the synthesized modifier and the lignosulfonate reagent to regulate the parameters of the drilling fluid was shown experimentally.
For some classes of Lévy processes, the notion of reflection from an interval boundary is introduced. It is shown that trajectories of a reflecting process define random operators that map functions ...defined on the interval boundaries into elements of
on the whole interval.
A method for approximation of the operator
e
−itH
, where
H
=
−
1
2
d
2
d
x
2
+
V
(
x
)
, in the strong operator topology is proposed. The approximating operators have the form of expectations of ...functionals of a certain random point field.
A new method of probabilistic approximation of solution to the Cauchy problem for the unperturbed Schrödinger equation by expectations of functionals of a random walk is suggested. In contrast to ...earlier papers of the authors, the existence of exponential moment for each step of the random walk is not assumed.
The boundary-domain integral method with the analytical integrals over the individual boundaries and internal cells for the solving the boundary value problems of fluid flow problems is developed. ...The axisymmetric potential flow of an incompressible fluid around a sphere, the fluid flow in a porous medium with spatially inhomogeneous permeability and the problem of convective-diffusive transport of a gas suspension in a periodic cell are calculated The comparison of the numerical results with analytical solutions show the efficiency and good accuracy of the developed boundary-domain integral method.
A method has been developed for the selective, simple and accelerated extraction-photometric determination of silver, based on the selective extraction of silver (I) from a strongly acidic medium in ...the presence of iodide ions and dimethylformamide and its complexation with dithizone directly in the organic phase. The apparent molar extinction coefficient of the dithizone complex of silver (I) at a maximum light absorption of 495 nm is 3.46·10
4
. The calibration graph is linear in the range of 0.5-50 mkg of silver (I) in 10 ml of extract. The determination of silver is not interfered with by large amounts of foreign ions in 100,000 multiples within the range of 2-5%. The developed extraction-photometric method for the determination of silver is recommended for the analysis of silver in ores, rocks, industrial waste and other materials with complex chemical composition without separating accompanying elements.
We prove one strengthening of the Darmois--Skitovich--Ramachandran theorem on characterization of normal distribution by independence property of linear statistics. PUBLICATION ABSTRACT
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