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Konstantinovich N.A.,National Mineral Resources University | Ivanovich N.V.,Scientific Instruments Company | Yevgeniyevich A.Y.,National Mineral Resources University | Yuriyevich B.V.,National Mineral Resources University | Migel P.,Higher Institute of Mining and Metallurgy, Moa
Obogashchenie Rud | Year: 2013

The authors of this paper discuss the problem of dressing laterite nickel ores of the Cuba Republic deposits and recovery of PGM metals as by-products from these ores and slime wastes. 100 kg of ore and 120 kg of concentration tailings were taken for sampling. Screen analysis and magnetic separation results obtained at the Che Gevara metallurgical mill are given.The chemical composition of the ore is now determined at the specialized pilot processing research center in Cuba on eight elements only (Ni, Co, Si, Fe, Mg, Al, Mn, Cr), but rare and PGM metals content is not included in the assessment scope. Within the scope of science and engineering cooperation between the National Mineral Resources University (St. Petersburg) and the Higher Institute of Mining and Metallurgy, Moa (ISMMM, Republic of Cuba) a dressability assessment of laterite ores involving recovery of PGM metals has been performed. For investigations the equipment provided by JSC "Nauchnye pribory" ("Sientific instruments") has been used. The investigation of the performance data available allowed to arrive at a conclusion that the most expedient means of production cost reduction to make it competitive with no capital reconstruction of metallurgical shops will be a pre-concentration process. It was found that in the process of nickel-cobalt sinter production Rhodium (0,069 %) and Platinum (0,017 %) are contained in the slimes. © Malyarova PV, Kaplauhov KN. Source

Shapovalov V.V.,Saint Petersburg State University | Gurevich B.S.,Scientific Instruments Company | Andreyev S.V.,Saint Petersburg State University | Belyaev A.V.,Russian Academy of Sciences | Chelak V.N.,Saint Petersburg State University
Progress in Biomedical Optics and Imaging - Proceedings of SPIE | Year: 2011

The spectral information, besides the spatial one, is very important in biology and medicine, as well as in many other areas. However the simultaneous analysis of the spatial and spectral information components is connected with certain difficulties which are caused primarily by the deficiencies of the devices which provide the spectral analysis (by light wavelengths) of images containing high spatial frequencies. We propose the method of biological objects images multispectral processing with rather high productivity. The device which provides this method performance includes a newly elaborated polychromic light source with real time controlled spectral composition for rough switching of the narrow spectral ranges, and acousto-optic tunable filter (AOTF) with wide angular aperture - for fine tuning of the selected sub-images wavelengths. The method and device practical configuration are considered and discussed. Also some features of AOTF required in the presented devices are analyzed. The possible information exchange between spectral and spatial information is also the subject of consideration as well the limitations of spectral and spatial resolving power. The experimental results connected with real time multispectral processing of tomographic images are presented and discussed. Also the possibilities of the method application for biology, medicine, and environment protection are considered. © 2011 SPIE-OSA. Source

Gurevich B.S.,Scientific Instruments Company | Shapovalov V.V.,Saint Petersburg State University
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

Modern acousto-optic devices are often elaborated specially for application in biomedical areas, especially for fast and reliable medical diagnostics. Among all the diversity of acousto-optic devices and components, the acousto-optic tunable filters (AOTF) look the most suitable to be used in this application area. The traditional spectrometers which could be applied for biomedical analyses, contain a light source providing light of wide spectrum, and a set of selective filters (for example, interference filters) which are usually involved in a turret. Hence, the mechanically moving parts must take place in such a device which makes the rate of measurements rather small. Also the diffraction gratings can be used in order to divide the total white light into the spectral components, however, these components are propagated into different directions, and the mechanically moving parts look to be necessary again. Only AOTF application provides the possibility to guide the different spectral components of light into the same direction. We also have proposed a new kind of light source for the spectrometer based on the set of light emitting diodes (LEDs) which allows to control the spectral composition of output light in real time. The device allows to solve the problem of fast and reliable performance of biochemical liquids analyses. Moreover, we consider the possibility to perform some non-invasive methods of analyses using the light reflected from human skin. Another way to use the acousto-optic spectrometer with controlled light source based on LEDs is multispectral processing of the biological objects color images. These problems are considered in details, and the possibility to use the Mancill's theory of color vectors in order to maximize amount of information obtained from the color images, is also discussed. © 2011 SPIE. Source

Gurevich B.S.,Scientific Instruments Company | Gurevich S.B.,RAS Ioffe Physical - Technical Institute | Manoilov V.V.,Russian Academy of Sciences
Optical Memory and Neural Networks (Information Optics) | Year: 2010

The reasons have been analyzed according to which the sampling theorem can be applied only for the approximate estimation of the number of freedom degrees in optical systems. © Allerton Press, Inc., 2010. Source

Kurland A.,Scientific Instruments Company
Proceedings of the American Gas Association, Operating Section | Year: 2015

A presentation covers an overview of measurements; level sensing for LNG; combination level, temperature , and density gauge; current sampling standard; fundamental spectroscopy processes, including phosphorescence, absorbance, fluorescence, and Raman; Raman LNG analyzer arrangement; software algorithms; spectrum standardization; developing the core method I and II; operational reliability case studies; and Raman spectroscopy for LPG. This is an abstract of a paper presented at the 2015 AGA Operations Conference Proceedings (Grapevine, TX 5/19-22/2015. Source

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