Measurement of sulfur content in pulps of the Novoyavorovo ore refinery by a neutron radiation method

We describe an apparatus and method for measurement of the sulfur concentration in the pulp stream under refinery conditions using neutron radiation analysis. We present the block diagram for the apparatus and the results of testing of the apparatus at the Novoyavorovo ore refinery.Translated from Izmeritel'naya Tekhnika, No. 2, pp. 60–61, February, 1995.     

Tendency of steels 10KhSND and 09G2S towards brittle failure

Conclusions The tendency towards brittle failure of low-alloy steels type 10KhSND and 09G2S at low temperatures depends on the supply condition. The highest resistance to brittle failure occurs for steel after temper hardening, i.e., quenching and high-temperature tempering. A changeover into a brittle condition for temper hardened steels of the test melts commences at –60°C, and for hot-rolled steels it commences at –40°C."Kompozit." Scientific-Production Organization. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 14–16, May, 1993.     

Low-temperature properties of porous silicon-indium nanocomposite

A new nanocomposite material with stable properties has been obtained representing a metal (indium) incorporated into a semiconducting porous silicon (por-Si) matrix. Electrical properties of the por-Si-In nanocomposite have been studied for the first time. At low temperatures (T = 1.4?C4.2 K), the por-Si-In samples exhibit a positive magnetoresistance [??R/R(H = 0) ?? 600%], which is related to breakage of the superconducting state of In particles in the por-Si matrix.     

Combustion of model compositions based on furazanotetrazine dioxide and dinitrodiazapentane. I. Binary systems

The combustion behavior of high-energy systems based on furazano[3,4-e]tetrazine-4,6-dioxide and 2,4-dinitro-2,4-diazapentane with metal and energetic additives (Al, AlH₃ ammonium perchlorate, ammonium dinitramide, and HMX) has been studied. The burning rate, combustion stability, and characteristic combustion temperatures with pressure variation are estimated. It is found that there is a critical burning rate above which a deflagration-to-explosion transition occurs. The critical conditions depend on the formulation of the compositions.     

Modulating mTOR Signaling as a Promising Therapeutic Strategy for Atherosclerosis

For more than a decade, atherosclerosis has been one of the leading causes of death in developed countries. The issue of treatment and prevention of the disease is especially acute. Despite the huge amount of basic and clinical research, a significant number of gaps remain in our understanding of the pathogenesis of atherosclerosis, and only their closure will bring us closer to understanding the causes of the disease at the cellular and molecular levels and, accordingly, to the development of an effective treatment. One of the seemingly well-studied elements of atherogenesis is the mTOR signaling pathway. However, more and more new details are still being clarified. Therapeutic strategies associated with rapamycin have worked well in a number of different diseases, and there is every reason to believe that targeting components of the mTOR pathway may pay off in atherosclerosis as well.     

On a static generalization of the Schwarzschild solution

By mean of the method of singular sources it is possible to construct gravitational multipoles which generalize the Schwarzschild solution. Talk given at the International Conference RUSGRAV-13, June 23–28, 2008, PRUR, Moscow.     

Speciation of radionuclides in colloidal matter of underground waters taken from observation wells in the zone of impact of Lake Karachai

The strength of actinide bonding with colloidal matter of groundwaters from the Lake Karachai contamination area was studied by selective leaching. An α-track analysis showed that the microdistribution of α-emitting radionuclides in the colloidal matter is uniform. Analysis of fission tracks confirms the presence of ²³⁹Pu and ²⁴¹Am in the colloidal material. In the colloidal matter of groundwaters taken from three wells and differing in the chemical composition, radionuclides occur in forms differing in the solubility. U and Np in the colloidal material are associated only with readily soluble and mobile groups of compounds and are not detected in the difficultly soluble residue. Pu and Am, on the contrary, occur in the colloidal material of groundwaters mainly in difficultly soluble forms. Am is bound to a greater extent with surface organometallic complexes. Pu is detected mainly in the fraction of amorphous oxides.     

Optical properties of metal nanoparticles in chrysotile channels

Technical Physics Letters - Chrysotile samples with macroscopically ordered channels filled by gold and silver have been studied using optical transmission spectroscopy. The channels had inner...     

Laser initiation of crystallized mixtures of furazanotetrazine dioxide and dinitrodiazapentane

Experiments were performed to determine the threshold laser pulse energy density resulting in explosive transformation of the mixtures studied. The experiments showed the possibility of using the laser initiation technique for rapid testing of mixtures of variable composition and structure.