Thermal Properties of Cobalt(II) β-Iminoketonates

Russian Journal of General Chemistry - Thermogravimetry, differential scanning calorimetry, and flow methods were used to investigate thermal properties of a series of cobalt(II)...     

(Allylamino)silanes: Synthesis,Properties, and Prospects of Use in Producing New Materials

Russian Journal of General Chemistry - Methods for the synthesis and purification of dimethyldi(allylamino)silane, ethyldi(allylamino)silane, and methyltri(allylamino)silane were developed. The...     

Results of Quantitative Analysis of High-Speed Shadowgraphy of Shock Tube Flows Using Machine Vision and Machine Learning

Doklady Physics - This paper presents the results of studies on unsteady gas-dynamic flows up to six milliseconds in duration in the shock tube channel. The results were acquired by continuous...     

Convective heat transfer in laser-irradiated graphite

The gas dynamic and thermal processes developing near the surface of graphite after exposure to a 20-nsec laser pulse with an energy E- 0.1–1 J and a wavelength of 0.6943 m are investigated experimentally and by mathematical modeling. The times required for the shock wave to degenerate into an acoustic wave are also considered. Typical density profiles over the axial section of the inhomogeneity are presented for various moments of time. It is noted that the rate of ascent of the thermal inhomogeneity is much higher than the free convection velocity. The convective heat-transfer processes are studied in detail through numerical solution of the system of two-dimensional Navier-Stokes equations. The results of the calculations are in satisfactory agreement with the experimental data.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 3, pp. 180–182, May–June, 1989.     

The influence of fluctuation inhomogeneity in a volume phase on one-layer adsorption

A theoretical study of adsorption was performed using a model of two-dimensional lattice liquid. One-layer adsorption from a binary solution was considered. As a result, the temperature dependence of the coefficient of the degree of filling close to the critical binary solution stratification point was found taking into account nonlocal liquid properties. Correlation effects that arise close to the critical point were shown to influence adsorption substantially.     

N-substituted hexamethyldisilazanes as new substances for the synthesis of functional films in the system Si-Ge-C-N-H

N-Organylbis(trimethylsilyl)amines of the general formula RN(SiMe₃)₂ (R = Me₃Si, Et₃Ge) were synthesized by reaction of sodium bis(trimethylsilyl)amide with the corresponding trialkylsilyl(germyl) halide. Their IR, UV, and ¹H, ¹³C, and ²⁹Si NMR spectra were studied, and saturated vapor pressures and thermal stabilities were determined. The possibility of using the RN(SiMe₃)₂ compounds as precursors in chemical vapor deposition of films with specified composition was estimated by thermodynamic modeling.     

Measurements of reduced mobility of standard compounds by high resolving power ion mobility spectrometer in remote laboratories

An atmosphere pressure ion mobility spectrometer is described. Both electrospray and corona discharge ion sources were used. Increased up to 100 resolving power allows obtaining higher selectivity and potentially widens application area. Satisfactory reproducibility of measured reduced mobility is required for improving reliability of identification including interlaboratory reproducibility of measured reduced mobility. Results of measurement were shown for the samples containing compounds proposed earlier as standards, those were measured in remote laboratories. Measured reduced mobility for 2,6-di(tert-butyl)pyridine amounted 1.48 cm²/V · sec for the measurements where corona discharge was used, and 1.46 cm²/V · sec for the measurements, where electrospray ionization was used. Both values are in a good agreement with a value 1.48 cm²/V · sec obtained earlier on the previous version of the instrument. Values of reduced mobility calculated by results of measurements accomplished in Munich for tetraethylammonium iodide, tetra-pentylammonium iodide and tetraoctylammonium bromide amounted correspondingly 1.77, 1.10, and 0.64 cm²/V · sec when electrospray ionization was used. The data are in a very good agreement with the values obtained earlier on the previous version of the instrument in remote laboratory.