Modeling parallel parking a car

In the paper, first results of the work on the development of an automated control system for parallel parking a car are presented. Parallel parking a car is an example of a frequently performed maneuver with high cost of a mistake, which makes creation of control systems for automated parking very important. An analytical method for solving the problem and numerical simulation of the process of car parking presented in the paper are intermediate results of the work on the development of an adaptive control system for car parking. Examples of parallel parking a car for some particular cases of mutual location of obstacles and the desired slot in the parking place are presented.     

Preparation and properties of isotopically pure polycrystalline silicon

A method for extracting silicon isotopes was developed. Polycrystalline ²⁸Si, ²⁹Si, and ³⁰Si samples isotopically enriched to 99.95, 99.5, and 99.9%, respectively, were prepared. Energies of optical phonons in the isotopically pure samples show the expected dependence on the average atomic mass.     

Recovery of Pd from Spent Fuel: 2. Sorption Recovery of Pd from Nitric Acid Solutions on Anion-Exchange Resins

Recovery of Pd from nitric acid solutions on various anion-exchange resins is studied. The effects of the HNO₃ concentration, temperature, and aminoacetic acid on the desorption of Pd are examined. Results of the experiments on Pd recovery from actual solutions from spent fuel reprocessing are reported.__________Translated from Radiokhimiya, Vol. 47, No. 4, 2005, pp. 339–342.Original Russian Text Copyright © 2005 by Korolev, Pokhitonov, Gelis, Milyutin.     

Influence of the structure of a modifier layer on the compatibility of polymers with a modified montmorillonite

The dependence of the compatibility of a modified montmorillonite with different-polarity polymers on the structure of a modifier layer formed on the montmorillonite surface has been investigated. It is shown that the layers forming an ordered structure in the interplane spaces of the clay do not provide an exfoliation of the silicate plates of the clay or a significant intercalation of polymer chains into the interlayer space of the montmorillonite. An optimum structure of a modifier layer, providing a significant intercalation of polymer chains into the interlayer spaces of the montmorillonite and an exfoliation of the clay in its compounds with a maleinized polypropylene, obtained by mixing in a melt, has been determined. __________ Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 78, No. 5, pp. 35–40, September–October, 2005.     

Probabilistic calculation of the stress within binder bridges in abrasive tools

A method of stress calculation is proposed, taking the parameters of abrasive machining more fully into account.     

Measurement of Gage Blocks on a Kosters Interferometer

Computational modeling has been employed to study how the uncertainty in the estimate of a fractional part of an interference order affects the results of gage block measurements with a Kosters interferometer at different values of the standard uncertainty for the fractional-order measurements. The statistical characteristics of the standard uncertainty of the distribution function for deviations of the measured results from the true value have been estimated at different values of the standard uncertainty of the fractional-order measurements.     

Magneto-photoluminescence in a type-II broken-gap n-GaInAsSb/p-InAs heterojunction

Magneto-photoluminescence in a single type-II broken-gap n-Ga_0.94In_0.06As_0.13Sb_0.87/p-InAs heterostructure with a 2D electron channel at the heterointerface containing two occupied electron subbands has been studied in the spectral range 0.3–0.8 eV in high magnetic fields of up to 10 T at low temperatures (T = 7 K). At photon energies in the range 0.5–0.8 eV, bulk photoluminescence from the layer of the n-GaInAsSb alloy was observed. In the low-energy part of the spectrum (0.3–0.45 eV), three narrow emission bands with photon energies hν _a = 0.419 eV, hν _b = 0.404 eV, and hν _c = 0.384 eV and full widths at half-maximum FWHM = 4–7 meV were observed. These bands are due to radiative transitions of 2D electrons localized in the quantum well on the InAs side near the type-II heterointerface. The electron effective mass in the occupied subband E ₂ was estimated to be m ₂ = 0.027m ₀, which is close to the effective mass at the bottom of the InAs conduction band.     

Magnetic properties of Ni<Subscript>3</Subscript>Al<Subscript><Emphasis Type="Italic">x</Emphasis></Subscript>Mn<Subscript>1 − <Emphasis Type="Italic">x</Emphasis></Subscript> alloys

Paramagnetic susceptibility of alloys Ni₃Al _x Mn_{1 − x} in the field of the transition between the ferromagnets described in the band theory (Ni₃Al) and in the spin-localized (Ni₃Mn) model of magnetic moments has been investigated. The concentration dependences of the paramagnetic Curie temperature, effective magnetic moment, and temperature-independent component of magnetic susceptibility have been determined.