New glassy materials in the system ZnO–B
2
O
3
:CoO system were obtained. The physicochemical and spectral properties of zinc borate glass doped with cobalt in the composition range 45 to 70 wt.% ...ZnO. The influence of the glass matrix on the coordination state of Co
2+
ions is shown. Intense absorption bands in the visible range are attributed to the transitions
4
A
2
(F) →
2
A
1
(G),
4
A
2
(F) →
4
T
1
(P), and
4
A
2
(F) →
2
E(
2
G). An absorption band attributable to the electronic transition
4
A
2
(
4
F) →
4
T
1
(
4
F) of cobalt in tetrahedral coordination was found in the near-IR range (1.3 – 1.7 μm).
Pigments and binders for obtaining radiation-resistant thermal-control coatings (TCC) for spacecraft were studied. A radiation-resistant thermal-control coating was obtained on the basis of the ...chosen components. The 15-year resistance of the coating in a geostationary orbit (GSO) was evaluated on the basis of ground-based tests. The comparative characteristics of white TCC (based on BaSO
4
), which are currently the most widely used coatings in Russia, are presented.
The first observation of coherent elastic neutrino-nucleus scattering (CEνNS), reported by the COHERENT Collaboration in 2017, paved the way for a new generation of experiments using reactor ν̄e and ...aiming at precisely measuring this process. In this context, the BASKET (Bolometers At Sub-KeV Energy Thresholds) R&D project investigates the use of cryogenic detectors for a reactor CEνNS experiment. This article reports on the first test of a Mo-doped lithium tungstate scintillating bolometer (⊘18 × 7 mm, 8 g), performed in an aboveground laboratory at CSNSM, Orsay (France). The detector bolometric performance (energy and time response, particle identification capabilities) and radiopurity have been studied and confirm the promising potential of lithium tungstate-based bolometric detectors for the measurement of CEνNS at reactors.
The possibility of obtaining black pigment based on nickel chromite (NiCr
2
O
4
) is examined. The morphological, granulometric, x-ray structural, and optical characteristics of synthesized ...crystalline powders of chromium nickel spinel are investigated. Upon spontaneous crystallization at temperature 950°C nickel chromite crystallizes in the spinel structure Fd3m with crystals ranging in size from 1.29 to 84 μm (predominantly in the form of an octahedron). The diffuse reflection spectra showed high emissivity of NiCr
2
O
4
: the diffuse reflection coefficient ranges from 2.65 to 4.81% in the range 320 – 1080 nm. Black glazes based on nickel chromite were obtained; the optimal weight content of the pigment is 6 – 8%.
The luminescence and optical properties of promising cryogenic scintillator Li2MoO4 were studied in the temperature region of 2–300K. The data on luminescence spectra and decay characteristics, ...excitation spectra, thermostimulated luminescence curves and spectra as well as transmission and reflectivity spectra are presented for the single crystals grown by two different procedures, the conventional Czochralski method and the low-temperature gradient Czochralski technique. The bandgap of Li2MoO4 is estimated from the analysis of transmission, luminescence excitation and reflectivity spectra. Up to three luminescence bands with the maxima at 1.98, 2.08 and 2.25eV are detected in the emission spectra of crystals and their origin is discussed. In the thermoluminescence curves of both studied crystals, two high-intensity peaks were observed at 22 and 42K, which are ascribed to the thermal release of self-trapped charge carriers. The coexistence of self-trapped electrons and holes allows one to explain the poor scintillation light yield of Li2MoO4 at low temperatures.
•Single crystals of Li2MoO4 were grown by two methods.•The transparency cutoff (~4.3eV) and bandgap values (<4.9eV) are estimated.•The emission 2.08eV is ascribed to self-trapped excitons and quenches at T>7K.•Shallow traps considerably influence the energy transfer to emission centres.•Co-existence of self-trapped holes and electrons results in a low light yield.
Hough transform-based methods for detecting multiple objects use nonmaxima suppression or mode seeking to locate and distinguish peaks in Hough images. Such postprocessing requires the tuning of many ...parameters and is often fragile, especially when objects are located spatially close to each other. In this paper, we develop a new probabilistic framework for object detection which is related to the Hough transform. It shares the simplicity and wide applicability of the Hough transform but, at the same time, bypasses the problem of multiple peak identification in Hough images and permits detection of multiple objects without invoking nonmaximum suppression heuristics. Our experiments demonstrate that this method results in a significant improvement in detection accuracy both for the classical task of straight line detection and for a more modern category-level (pedestrian) detection problem.
The possibility of obtaining black pigment based on nickel chromite (NiCr.sub.2O.sub.4) is examined. The morphological, granulometric, x-ray structural, and optical characteristics of synthesized ...crystalline powders of chromium nickel spinel are investigated. Upon spontaneous crystallization at temperature 950°C nickel chromite crystallizes in the spinel structure Fd3m with crystals ranging in size from 1.29 to 84 mum (predominantly in the form of an octahedron). The diffuse reflection spectra showed high emissivity of NiCr.sub.2O.sub.4: the diffuse reflection coefficient ranges from 2.65 to 4.81% in the range 320 - 1080 nm. Black glazes based on nickel chromite were obtained; the optimal weight content of the pigment is 6 - 8%.
New moisture-sensitive ceramic materials in the Li
2
MoO
4
-Li
2
WO
4
system were obtained. Use of these materials as humidity sensors demonstrated their promise for use in systems for controlling ...the moisture content of gaseous industrial media and ambient air, for example, in construction, due to the miniature nature, fast response, high sensitivity, and wide range of working temperatures and measurable relative humidity.
The process for obtaining coloring of the “copper ruby” type in thermochemical treatment of thermally polished glass with copper-containing reagents was examined. Data are reported on the effect of ...the compositions of the working solutions and process regimes on the character of the coloring and the spectral characteristics of the glasses. Formation of the diffusion layer and the effect of different factors on the quality of the “copper ruby” obtained were investigated, and practical recommendations were given on selecting the optimum coloring regimes.
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