Estimation of physical parameters of magnetic nanoparticles

The results of estimation of the magnetic moment and sizes of magnetic nanoparticles in a magnetic fluid obtained using the technique based on measuring the field dependence of the acoustomagnetic effect are considered in the paper. The samples with different magnetic phase concentrations are analyzed. The obtained results compared with the data of magnetogranularmetric analyses are studied.     

Pulsed-periodic laser on RM helium and strontium transitions

Conditions of generation of a running excitation wave in the active medium of gas lasers and efficiency of the running wave application for pumping of the active medium are considered by the example of a strontium vapor laser. It is demonstrated that the running excitation wave is generated directly in the active laser medium and is supported by the energy stored in the capacitive component of the impedance of a gas-discharge tube. Generation on the self-limited (2¹P₁-2¹S₀) transition of the helium atom at λ = 2058 nm and simultaneous generation on RM transitions of the strontium ion and strontium and helium atoms and on a number of neon atom transitions is first excited. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 1, pp. 6–9, January, 2008.     

Synthesis of α-neryl and α-geranyl propionates — Components of the sex pheromone of San Jose scale

Summary An effective synthesis of -neryl and -geranyl propionates has been performed by the two-stage E/Z-C₅ homologization of 3-methylbut-3-en-1-yl iodide.N. D. Zelinskii Institute of Organic Chemistry, Moscow. All-Union Scientific-Research Institute of Biological Methods of Plant Protection, Kishinev. Institute of Chemistry, Bashkir Scientific Center, Urals Division, Academy of Sciences of the USSR, Ufa. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 422–424, May–June, 1989.     

Changes in the phase composition of oxide layers produced by microarc oxidation on Al–Si and Mg alloys induced by additions of SiO<Subscript>2</Subscript> nanoparticles to the electrolyte

In oxide layers produced by microarc oxidation on Al–Si- and Mg-based alloys, addition of nano-dispersed silicon dioxide to the electrolyte was found to cause a shift in the phase composition toward high-temperature phases and ultra-high-pressure phases. For the first time, ultra-high-pressure phases were detected in oxide layers formed by microarc oxidation on AK6M2 alloy (stishovite) and commercially pure magnesium MG96 (wadsleyite).