Conformation of 1,5-Bis(16-oxobeyeran-19-oyloxy)-3-oxapentane in CCl<Subscript>4</Subscript>

1,5-Bis(16-oxobeyeran-19-oyloxy)-3-oxapentane in carbon tetrachloride exists mainly in tweezers-like conformations where the isosteviol fragments hang over each other.__________Translated from Zhurnal Obshchei Khimii, Vol. 75, No. 2, 2005, pp. 272–275.Original Russian Text Copyright © 2005 by Kataev, Strobykin, Timosheva, Al’fonsov, Korochkina, Strobykina.     

Resolution of the enthalpy of vaporization of dipolar nonelectrolytes into component parts

A method is proposed for analyzing and calculating the enthalpy of vaporization of various nonelectrolytes. It quantitatively separates the contributions from polarization and specific interactions of substituents and from dispersion interactions of the molecule as a whole.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 302–305, February, 1990.The authors are grateful to A. N. Vereshchagin, who participated in the discussion of the results.     

Experimental studies of the characteristic features of vector receivers in application to ocean tomography

Experimental data on the angular structure of the sound field on the shelf of the Sea of Japan are discussed. The data are obtained by using the vector-phase processing of complex signals in the form of M-sequences with a central frequency of 2500 Hz. With the parameters of the water bulk being monitored, an unambiguous relation is established between the variability of the temperature regime on a fixed acoustic path and the arrival times and angles. It is shown that the use of vector receivers in ocean tomography provides an additional independent parameter of the pulse response of the underwater waveguide and leads to an increase in the efficiency of solving the problem of reconstructing the hydrophysical fields from the data of acoustic sensing.     

Experimental studies of seasonal variation for temperature fields on the Sea of Japan shelf by acoustical methods

The results of experimental studies are given for the pulsed characteristic of an underwater channel on the Sea of Japan shelf depending on the seasonal variation of a temperature field.     

An empirical analysis of the contributions of intermolecular dispersion interactions to the vaporization enthalpy of nonelectrolytes

A parameter was proposed, which is linearly related to the energy contribution of the dispersion interactions to the vaporization enthalpy. We showed the applicability of this parameter for the analysis of the energy characteristics of intermolecular interactions calculated from the internal pressure in liquids.Deceased.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2846–2848, December, 1989.     

Acoustic-hydrophysical testing of a shallow site in coastal waters of the Korean Strait

The paper describes the results of testing experiments for solving problems of thermometry and positioning of an autonomous underwater vehicle (AUV) in the Korean Strait in a shallow sea with less than 10 m of water. The studies were conducted on acoustic tracks up to 615 m long, sensed with complex phase-shift keyed signals with a centeral frequency of 2500 Hz. Under field experiment conditions, it was shown that the resolution of the structure of pulse responses makes it possible to sense temperature changes less than one degree and to secure positioning of the AUV with an accuracy better than 1 m when operating in the near-bottom layer.     

Specificities of applying pseudorandom sound signals to measuring impulse responses on the shelf of the Sea of Japan

Solving the problems of underwater acoustic communication and navigation for controlling underwater objects greatly depends on a correct estimation of the hydrological and acoustical environment in the region. Analysis of the domestic and foreign experience in the field of navigational support of self-contained underwater devises shows that, to solve the problem, it is technically and economically advantageous to deploy a set of fixed sources of navigation signals in the region with a range of coverage that is at least not less than the size of the region of interest. At long distances and, especially, in a shallow-water sea, the key factors in solving the problem of navigation are correct determination of the efficient sound speed and the time of signal propagation for each path connecting sources and receivers.     

Conformational analysis and regioisomerism of mono- and diadducts of O,O-diisopropyl isoxazolinophosphonate with C60

Theoretically, cycloaddition of two molecules of phosphorylated nitrile oxide to C₆₀ can give rise to 22 regioisomers. A simple convenient nomenclature was proposed for their classification based on the well-known Hirsh nomenclature. A combination of HPLC, semiempirical quantum-chemical PM3 calculations, and the dipole moment method demonstrated that the equatorial, trans-4(tt), and trans-3(tt) adducts are most probable.