Abstract
The article discusses monitoring water bodies pH level automated system implementation using an unmanned aerial vehicle (UAV). Floating structure prototype for supporting UAV on water ...surface is described, taking into account creating a rotor thrust theory. Water hydrogen ions monitoring activity concept using a UAV is presented. Testing results water monitoring system in Lake Boyarskoye (Tomsk, Russia) are presented.
The scintillation crystal bismuth germanate (BGO) is widely used in many applications. The unique technique developed in the Nikolaev Institute of Inorganic Chemistry, Novosibirsk, Russia, allows ...routine production of top quality large-sized BGO crystals. One of the important properties of a scintillation crystal is its radiation hardness. The intensive study of the radiation hardness of BGO crystals has been carried out by the collaboration of the Institutes of Siberian Branch of the Russian Academy of Science, Novosibirsk. The influence of the raw material purity and growth procedure on radiation hardness has been studied. The final tests of the crystal radiation hardness were performed by irradiating it with gamma rays from the radioactive source. The degradation of a light output of the best crystals is less than 10% after irradiation with doses of 10-100 krad expected in astrophysics experiments at a satellite. Based on the results of this study, the radiation hard BGO crystals for the "INTEGRAL" and "ASTRO-H" satellite missions have been made. A selfrecovery of the crystal light output is clearly seen. The time scale of the self recovery strongly depends on a dose of irradiation. It is days for 1 krad irradiation, weeks - for a 10 krad dose and a much longer period is required for 100 krad irradiation. All the crystals irradiated with a dose of 100 krad completely recover after annealing. The study reveals that there will be no essential degradation if this dose will be integrated over years of operation.
The paper describes an experimental study of the influence of multiple cyclic pressure loading on the service life and sorption performance of a composite sorbent whose granules consist of ...selectively permeable (to helium) microspheres as a filler and pseudoboehmite as a porous binder. A test bench is specially designed and fabricated for the study, which makes it possible to model various operation regimes of gas-separation plants in the pressure range up to 10 MPa. Cyclic tests of pressure loading of the granulated composite sorbent are performed, and the sorption capacity of the sorbent with respect to helium is measured. It is found that the composite sorbent retains its integrity and sorption performance under cyclic loading of 1000 cycles and more at pressures up to 10 MPa.
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A method is presented for measuring the energy density of X-ray pulses with a duration of approximately 200 ns from a source with an energy of 2–3 J in its discharge circuit. A bismuth germanate ...(BGO) scintillator crystal is used for measurements. The absolute calibration of the energy scale has been carried out by measuring the amplitude spectrum of cosmic muons. The energy flux of an X-ray pulse, measured at a distance of 1 m from the anode of the source, is 20 GeV/cm
2
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Calorimetry of the CMD-3 detector Akhmetshin, R R; Anisenkov, A V; Aulchenko, V M ...
Journal of physics. Conference series,
11/2017, Letnik:
928, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The CMD-3 detector has been collecting data since 2010 at the e+e− collider VEPP-2000 in the Budker Institute of Nuclear Physics. VEPP-2000 uses the novel round beam technique and provides high ...luminosity in a wide c.m.energy range from 0.32 to 2 GeV. The physics goal of the CMD-3 experiment is a study of the e+e− annihilation into hadrons. CMD-3 is a general-purpose detector, which provides high efficiency for both charged and neutral particles. The electromagnetic calorimeter consists of the barrel calorimeter based on liquid xenon and CsI crystals, and the endcap calorimeter based on BGO crystals. The main parameters of the calorimeters are presented.
A hyperbolic character of the convective part of the flow of an air–helium mixture through a granulated sorbent layer with allowance for the Forchheimer filtration is demonstrated. A numerical model ...of a one-dimensional flow of the air–helium mixture through an adsorber filled by a granulated sorbent with due allowance for air and helium diffusion inward cylindrical granules and helium confinement in microspheres is developed. Within the framework of this model, verification of a numerical algorithm in problems of gas filtration through a porous medium and propagation of a pressure wave formed by the incident shock wave over a gas medium is performed. Experimental and numerical data are obtained and are found to be in good agreement. The enrichment phase is modeled by the method of pressure swing adsorption with the use of a bifunctional sorbent based on microspheres. It is demonstrated that the mass fraction of helium in the air–helium mixture can be almost doubled (from 0.7 to 1.3%) with the helium extraction degree of 90.4%.
Alpha radioactive background in BGO crystals Grigoriev, D.N.; Kazanin, V.F.; Kuznetcov, G.N. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2010, Letnik:
623, Številka:
3
Journal Article
Recenzirano
We describe some cases of unusual internal radioactive background in BGO crystals. Routinely produced at the Nikolaev Institute of Inorganic Chemistry during nearly a quarter of a century, BGO ...crystals have low radioactive background caused by
207Bi contamination. However, some BGO crystals incidentally have higher internal radioactive background with activity up to 10
Bq/kg. This background is pure alpha radioactivity. It is caused by
210Po contamination and has technogenic origin.
Mathematical methods are developed to describe helium sorption by microspheres with a certain size distribution. An analytical solution of the problem is derived and applied to expand the ...experimental dependences of the degree of helium sorption by microspheres on time into harmonics. As a result, the time characteristics of the sorption process can be analyzed.
In this work, experimental study of propagation shock waves and pressure-waves in granular medium was performed. As a granular medium are used hollow glass microspheres and composite sorbent based on ...them. The special experimental setup was prepared, which uses the principle of a shock tube. The setup includes a high pressure section and low pressure section with stepwise change of its internal diameter. The pressure graphics were obtained for the various tube sections for different media. The tube filling time and pressure wave velocity in the medium were estimated.
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