New problems of cometary observations from space

The possibility of treating the comets as natural probes of the solar system presents one of the attractive sides of cometary astronomy. In connection with the plans to study comets from space, new aspects for comets as interplanetary probes are of interst. Possible meteor formation in cometary heads and the implication for space research are considered

Mechanical alloys Mg-Me (Me: Ti, Fe, Ni, Al) & Mg-Me1-Me2(Ме1:Al, Me2: Ti, Fe, Ni) with low resistance and improved kinetics of hydrogenation/dehydrogenation for hydrogen storage applications

Changes in MgH2 decomposition kinetics were investigated in dependence on complex doping of MgH2 by Al, Ti, Ni,and Fe. Reactive mechanochemical alloying method (RMA) was applied in the temperature descending regime. It was found that addition of Al+Ni+Ti, Al+Ti, Fe+Ti (see below) and Al+Fe elements combinations led to a lower  thermal stability and, consequently, to a lowering of the temperature of hydrogen desorption onset. Whereas desorption began at temperature of 320 °C from the pure MgH2, the aditions of Al, Ni, Ti and Fe lowered the start of the desorption down to 250°C (at hydrogen pressure 0.1 MPa in the reactor). Very fast desorption kineticsprecize at 300 0C and PH 2= 0.1 MPa were observed for Mg+Me mixture in comparison with the pure Mg. Sorption capacity of investigated mechanically-alloyed composites varied from 5 to 6.5 wt. % H2. The tested materials showed a high potential as hydrogen storage alloys especially for stationary application

The algorithm of the electric stimulator VEB-1 software operation

This thesis demonstrates results of the electric stimulator VEB-1 software operation algorithm development. To increase the device efficiency, the algorithm is composed using the frequency beat method. Our software solutions allowed us to provide the needed precision to maintain the operating frequency of the electric current pulses that penetrate through the human body on the level not less than 0,001Hz. The software allows the operator to control the electrostimulation process through the screen, where all active processes are displayed

Correlation investigation of the brightness of GDE-grams using the methods of computer graphics and direct measurements

There are two methods of measuring the glow of a liquid under the conditions of gas-discharge imaging. This is a investigation of the brightness of GD-grams - a digital image of streamers created under these conditions, and a direct measurement of brightness using a luminometer, which is carried out during the formation of a streamer during a gas discharge. In the first case, the digital image is analyzed using computer graphics methods and certain software. In the second, the results of direct measurement are analyzed. We have analyzed these two methods using the example of the glow of water under the conditions of gas-discharge visualization. It is shown that with direct measurements the brightness values ​​are higher than when investigating the brightness of a digital image of the same streamer obtained in the same time period. Namely 1.5 cd/m2 and 1.7 cd/m2. The difference is 13% and significantly exceeds the measurement error of the brightness meter (± 7%). According to the results of our research, we suggest that, at the very least, when calibrating the devices that create the GDV-grams, use direct measurements of the glow of the liquid in photometric units. For example, in brightness units

Thermostabilized photodiode for monitoring radiation of medical lasers

The construction of cooled photodiode for medical lasers with non-linearity of output performance in the range from 10⁻⁸ to 10⁻¹ W not more than 1.05 % is suggested. Regulation of cooling the crystal of photodiode is performed by means of specific software controlling the temperature of the photodiode crystal depending on the value of its photocurrent

Sensitivity of Cross Sections for Elastic Nucleus-Nucleus Scattering to Halo Nucleus Density Distributions

In order to clear up the sensitivity of the nucleus-nucleus scattering to the nuclear matter distributions of exotic halo nuclei, we have calculated differential cross sections for elastic scattering of the $^6$He and $^{11}$Li nuclei on several nuclear targets at the energy of 0.8 GeV/nucleon with different assumed nuclear density distributions in $^6$He and $^{11}$Li.Comment: 10 pages, 7 figures. Submitted to Proceedings of the 61 International Conference "Nucleus-2011" on the Problems of the Nuclear Spectroscopy and the Atomic Nuclear Structure, Sarov Nijzegorodskaya district, October 10-14, 201

FOTODIODA OPARTA NA EPITAKSJALNYM FOSFORKU GALU O ZWIĘKSZONEJ WRAŻLIWOŚCI PRZY DŁUGOŚCI FALI 254 nm

The paper shows the results of the development of a photodiode technology based on gallium phosphide structure n+-n-GaP-Au with high sensitivity. It provides the ion etching of the surface of the gallium phosphide before an application of a leading electrode of gold. The barrier layer of a 20 nm thick gold is applied to the substrate in the magnetic field of GaP. When forming the contact with the reverse side of the indium substrate at 600°C, there occurs the annealing of the gold barrier layer. At the maximum of the spectral characteristics obtained by the photodiode, it has a sensitivity of 0.13 A/W, and at a wavelength of 254 nm – about 0.06 A/W. The dynamic range of the photodiode is not less than 107.Artykuł pokazuje rezultaty rozwoju technologicznego fotodiody opartej na fosforku galu o strukturze n+-n-GaP-Au o wysokiej czułości. Umożliwia to wytrawianie jonowe powierzchni fosforku galu, zanim zastosowana zostanie elektroda przewodząca wykonana ze złota. Złota warstwa barierowa o grubości 20 nm jest nakładana na podłoże GaP w polu magnetycznym. Gdy powstaje styk z tyłu podłoża indowego w temperaturze 600°C, złota warstwa barierowa jest wyżarzana. Przy maksymalnej charakterystyce spektralnej uzyskanej przez fotodiodę, ma ona czułość 0,13 A/W, a przy długości fali 254 nm – około 0,06 A / W. Zakres dynamiczny fotodiody wynosi co najmniej 107

Effect of lithium borate coating on the electrochemical properties of LiCoO2 electrode for lithium-ion batteries

The effect of a protective coating of fused lithium borate, Li3BO3, on the physicochemical and electrochemical characteristics of LiCoO2 has been studied. A cathode material produced by the SCS method using binary organic fuel, glycine and citric acid. The influence of the experiment conditions on the morphology, crystal structure and specific surface of lithium cobaltite was studied. Electrochemical testing of LiCoO2∙nLi3BO3 samples, n = 5 and 7 mass %, has been performed in the cathode Li|Li+-electrolyte|LiCoO2∙nLi3BO3 half-cell using 1M LiPF6 in EC/DMC mixture (1:1) as electrolyte in the 2.7-4.3 V range at normalized discharge current С/10, С/5, С/2. The maximal initial discharge capacity of 185 mAh/g was detected for the samples with 5 mass % Li3BO3. The coulomb efficiency of optimal materials in the 40th cycle was 99.1%