Gamma Spectrometry of Composite Models of Planetary Matter on the JINR Accelerator Proton Beam with Tagged Protons

Physics of Particles and Nuclei Letters - The results of the second stage of laboratory tests of the space gamma-spectrometer model on the phasotron installed at the JINR Laboratory of Nuclear...     

Simulation of Space Experiments for Nuclear Planetology: Measurement of Relative Intensities of Lines of Gamma Ray Emitted upon Thermal-Neutron Capture by Nuclei

The results obtained by experimentally studying gamma rays emitted by samples prepared as analogs of planetary matter and irradiated with thermal neutrons are presented. The intensities of spectral lines of gamma rays emitted by such samples differing in chemical composition are compared. These results will be used in processing data on gamma-ray spectra of the Moon and Mercury from measurements performed onboard spacecrafts with the aim of studying the composition of the surface of these celestial bodies.     

SHS metallurgy of high-entropy transition metal alloys

The first positive experience in synthesis of cast high-entropy alloys in the combustion mode, referred to as SHS metallurgy (SHS is self-propagating high-temperature synthesis) has been reported. Analysis of the data obtained enables the conclusion that the one-stage SHS method is promising for the production of cast metal materials using a new principle of formation of high-entropy polymetallic alloys.     

Test facility for nuclear planetology instruments

An experimental facility for testing and calibrating nuclear planetology instruments has been constructed in partnership between the Space Research Institute (Moscow) and the Joint Institute for Nuclear Research. A model of Martian soil with a size of 3.82 × 3.21 m² and an overall mass of about 30 t is assembled from silicate glass. Glass is chosen in order to imitate absolutely dry soil close in composition to the Martian one. The heterogeneous model allows one to imitate the average elemental composition of Martian soil in the best possible way by adding layers of the necessary materials to it. Near-surface water ice is simulated by polyethylene layers buried at different depths within the glass model. A portable neutron generator is used as the neutron source for testing active neutron and gamma spectrometers. The facility is radiation-hazardous and is thus equipped with interlock and radiation monitoring systems in accordance with the effective regulations.     

Magnetic and structural correlations in EuMnO and BiMnO crystals in the paramagnetic temperature range

The magnetic and dielectric properties of EuMn₂O₅ and BiMn₂O₅ crystals are investigated over a wide range of temperatures 4.2–250 K, including the range T≫T _N ≃40 K. Significant departures from the Curie-Weiss law are observed in both crystals for the magnetic susceptibility in the paramagnetic range; they are attributed to the presence of correlated domains of magnetic order over a wide range of temperatures. Anomalies in the dielectric properties of the crystals are observed in the same temperature range T>T _N and, as in the case T<T _N , are correlated with the magnetic properties. Zh. éksp. Teor. Fiz. 112, 284–295 (July 1997)     

Mechanical properties of adsorption layers in solutions of human blood serum proteins: A comparative assessment

The mechanical properties of adsorption layers in small volumes (0.1 ml) of protein solutions in a saline are studied using small-diameter indenters. In an albumin solution, the partial substitution of the protein by an equivalent (by weight) amount of immunoglobulins G or M reduces the surface energy, whereas the addition of fibronectin improves the mechanical strength of the layer. The data obtained may provide a deeper insight into the mechanisms of specific dynamic processes responsible for the structuring of biological fluids in drying drops. In particular, such information is of value for medical diagnosis.     

Ueber die Zusammensetzung des Lackes,welcher auf dem baumwollenen Gewebe bei der Färbung mit basischen Farbstoffen gebildet wird

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