Bulk density of the energy of deformation in an anodic aluminum oxide with pores filled by threadlike metal nanocrystals

The problem of determining the bulk density of the energy of deformation in composites with threadlike metal nanocrystals in a matrix of anodic aluminum oxide is solved with allowance for the difference between the thermal coefficients of the linear extension of elements of heterogeneity. Model calculations are performed for nanocomposites with tin, zinc, and indium nanocrystals.     

Polymerization of isoprene with cobalt catalysts

The polymerization of isoprene with catalytic systems efficient for the cis polymerization of butadiene, i.e., cobalt 2-ethyl hexanoate-diethylaluminum chloride and cobalt 2-ethyl hexanoate-ethylaluminum sesquichloride, is studied. The catalysts are obtained via in situ mixing of the components or at a reduced temperature (0–5°C) in the presence of a small amount of the monomer. In situ polymerization proceeds with an induction period, whose duration depends on the polymerization conditions, or without this period if a preformed catalyst is used. In each case, the resulting polymer is characterized by a mixed microstructure with a predominant content of cis-1,4 units and 3,4 units.     

Experimental investigation of cooling of a plate by ionic wind from a corona-forming wire electrode

We report on the results of experimental investigations of the kinematic structure of ionic wind from a wire electrode placed near a heated plate, which plays the role of the earthed electrode. Experiments are carried out in a wide range of voltages for different polarities of the wire for several values of the electrode gap. We compare the structures of the flows emerging as a result of natural convection in open air for different positions of the plate and in the presence of a fast ionic wind jet that considerably intensifies heat transfer in the boundary layer at the heated planar electrode. Local temperature distributions over the plate surface are obtained, as well as the integral dependences of the effective heat removal on the electric parameters of the corona discharge. The velocity of air flows with ionic wind reaches 4 m/s, and the heat power removed from the plate for fixed overheating increases ninefold compared to the situation with natural convection.     

Phase transformation α → ε in meteoritic Fe–Ni alloy under shock-wave loading

We have studied microstructural deformation-induced changes and phase transformations in the material of the Sikhote-Alin iron meteorite (IIAB) after loading by spherically converging shock waves. The results obtained by the method of electron backscatter diffraction, as well as the data of local chemical analysis unambiguously indicate the presence of regions experiencing polymorphic α → ε and ε → α transitions in the loaded sample.     

The optical module of Baikal-GVD

In April 2015, the first cluster of Baikal-GVD was deployed in Lake Baikal and put into operation. It comprises eight strings. Each string consists of 24 optical modules. An optical module is a detection element of Baikal-GVD; it includes a Hamamatsu R7081-100 photomultiplier tube with a high quantum sensitivity. We describe the design of the optical module, the front-end electronics, and the laboratory characterization and calibration.     

Trifunctional thermosetting monomer with propargyl and phthalonitrile groups

Russian Chemical Bulletin - A new monomer containing thermosetting groups of two types, namely, propargyl ether and phthalonitrile, in the structure of the molecule was synthesized and studied. It...     

Investigation of the Influence of the Underlying Terrain on the Impedance of a System of Two Randomly Oriented Parallel Linear Antennas

Russian Physics Journal - The results of a numerical investigation of the influence of inhomogeneous dielectric media on the impedance of a system of two parallel linear antennas randomly...