Formation of a 4-quinazolone on attempting to synthesize a symmetrical amidine of anthranilonitrile. Crystal structure of 3-(2-cyanophenyl)-4-quinazolone

Attempts to synthesize a sym-diarylformamidine by the reaction of anthranilonitrile and its N-formyl derivative led to the formation of 3-(2-cyanophenyl)-4-quinazolone. The structure of the substance obtained was confirmed by x-ray analysis.M. V. Lomonosov Moscow State University, Moscow 119899. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1105–1108, August, 1997.     

The effect of simple electrolytes on coagulation of hydrosols of monodisperse negatively charged detonation nanodiamond

The influence of the concentration of potassium and barium chlorides on the aggregation stability of a hydrosol of monodisperse negatively charged detonation nanodiamond with particle sizes of 4?5 nm obtained by annealing of its agglomerates in air has been studied by turbidimetry. The experimental results have been discussed within the classical and generalized Derjaguin?Landau?Verwey?Overbeek theories. The analysis of the pair interaction potentials calculated for ultradispersed particles of detonation nanodiamond has led to the conclusion that the coagulation occurs by the barrier mechanism in the primary potential minimum. It has been assumed that the structural component of the interparticle interaction energy contributes to the total balance of the surface forces.     

Parametric instability of the m = 1 mode in the dynamic stabilization of a plasma filament

We consider the parametric excitation of long-wave magnetohydrodynamic oscillations of the m = 1 type in a cylindrical plasma conductor with an alternating, longitudinal, high-frequency current. The plasma cylinder is placed in a constant longitudinal magnetic field and is enclosed in a conducting case. The problem is solved on the basis of the flexible filament model under the assumption of ideal conductivity of the plasma and the case. Hill's method is used to study the stability of the equation with periodic coefficients that describe the oscillations of the filament. Results of computer calculations of the stability increments of oscillations in the first four resonance zones for various values of the parameters of the system are given.Translated from Zhurnal Prikladnoi Mekhaniki i Tekhnicheskoi Fiziki, No. 4, pp. 42–46, July–August, 1972.In conclusion the authors thank M. L. Levin for helpful discussions of the work.     

Abelian p-extensions of an absolutely unramified field

In this paper the characteristic of the Abelian p-extensions of a field is given using valuations from its cyclotomic extensions. On the basis of this the character group of the Galois groups of the maximal Abelian p-extension of an absolutely unramified complete field is calculated. The results are applied to the case of a two-dimensional local field.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova Akademiya Nauk SSSR, Vol. 191, pp. 80–90, 1991.     

Photoluminescence spectra of ultradisperse diamond

The first study of materials based on ultradisperse diamond produced by detonation is reported. A luminescence band in the visible has been observed, and some of its structural features have been interpreted by analogy with the known luminescence bands of centers in synthetic and natural diamonds. A comparison of the spectra obtained from ultradisperse diamond samples with the surface modified by different chemical treatments suggests that their pattern is governed to a considerable extent by the presence of a graphitic layer on the grain surface. Fiz. Tverd. Tela (St. Petersburg) 39, 2156–2158 (December 1997)     

Automated stand check of “B” type TRT ATLAS wheel straw detectors

The automated stand developed and created by the collaboration ATLAS for testing the wheel modules of the TRT ATLAS straw detectors allows a complete check of the module that defines the serviceability of all its channels and measures the gas gain inhomogeneity along its length for each straw. The results of testing the “B” type modules manufactured at the Laboratory of Particle Physics, JINR are presented.     

Preparation of plates with a permanent adsorbent layer and their application in the analytical thin-layer chromatography of lipids.

Experimental conditions for preparing the thin-layer chromatographic plates with a permanent adsorbent layer (PAL) have been established; the particles of this layer are firmly bound to each other and to the glass support by means of fused glass powder. To prepare the PAL plates, a mixture of Woelm silica gel and glass powder (1:3, w/w) of particle size 7+/-1 mum was suspended in toluene and spread on the plates, yielding PALs of thickens 150-250 mum. The plates were heated in an electric furnace at 675 degrees for 20 min. In the separation of neutral lipids, a PAL thus prepared is equal in efficiency and selectivity to silica gel layers prepared in the usual manner.