Reduction of the laminar compound of graphite with FeCl3 by hydrogen at high pressure

Conclusions A method is proposed for the reduction of laminar graphite compounds at hydrogen pressure up to 70 kbar, which has a number of significant advantages relative to reported methods. This method may be used to obtain new acceptor LGC.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 450–452, February, 1986.The authors express their gratitude to P. B. Fabrichnyi for assistance in the Moessbauer spectral study of these compounds.     

Study of continuity of random sequences by constructing proximity points

A method of estimation of time-uniform continuity of random sequences is considered that makes it possible to interpret previous methods from a single point of view.Translated from Problemy Ustroichivosti Stokhasticheskikh Modelei — Trudy Seminara, pp. 52–57, 1980.     

Propagation of perturbations in processes described by degenerate parabolic equations with nonpower nonlinearities

The paper deals with the homogeneous first boundary-value problem for a one-dimensional quasilinear second-order parabolic equation without any assumptions about the nonlinear solution functions and their derivatives to be of power type. A criterion for the finiteness of the velocity of the propagation of perturbations is found. The influence of the zero order of the initial function at an inner point on the evolution of the corresponding component of the solution support is investigated.Translated from Trudy Seminara imeni I. G. Petrovskogo, No. 10, pp. 118–134, 1984.     

Adhesive Wear of Copper Friction Pair in Inert Atmosphere Reduced by Nitrogen Ion Implantation

Russian Physics Journal - The paper studies mechanisms of increasing the adhesive wear resistance of the copper specimens after the bombardment by the nitrogen ions, which are coupled with a...     

Modern Russian mass spectrometers for the atomic industry

Product quality control within the nuclear fuel cycle is a subject of special concern in Russia nowadays. Earlier, mass spectrometers of foreign production were commonly used for elemental and isotope analysis of samples. Currently, a series of domestic mass spectrometers MTI-350 has been developed and their production has been organized in Russia. The series comprises an automated MTI-350G mass spectrometer for the isotope analysis of uranium hexafluoride; thermal ionization MTI-350T mass spectrometer for the isotope analysis of uranium, plutonium, and mixed oxide (MOX) fuels; an MTI-350GS mass spectrometer for controlling the production of uranium hexafluoride; and an MTI-350GP mass spectrometer for the determination of the impurity concentration in uranium hexafluoride. The article considers operation principles, analytical characteristics, and the advantages of the above mass spectrometers.     

Tails of waiting times and their bounds

Tails of distributions having the form of the geometric convolution are considered. In the case of light-tailed summands, a simple proof of the famous Cramér asymptotic formula is given via the change of probability measure. Some related results are obtained, namely, bounds of the tails of geometric convolutions, expressions for the distribution of the 1st failure time and failure rate in regenerative systems, and others. In the case of heavy-tailed summands, two-sided bounds of the tail of the geometric convolution are given in the cases where the summands have either Pareto or Weibull distributions. The results obtained have the property that the corresponding lower and upper bounds are tailed-equivalent. This revised version was published online in June 2006 with corrections to the Cover Date.     

离子色谱法测定蓝藻培养液中有机酸和无机阴离子

建立了一种利用阴离子交换色谱柱分离,电导检测器同时测定17种有机酸和7种阴离子的方法。采用Ionpac AS11-HC阴离子交换柱,KOH溶液作为淋洗液,梯度洗脱,流量为1.0mL/min,柱温为30℃,进样体积为25μL。24种分析物测定结果的相对标准偏差在0.31%~2.67%之间,线性相关系数均大于0.996,平均加标回收率在80.3%~108.5%之间。该方法可用于微生物培养液中有机酸和阴离子的同时测定。