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    Wyświetlanie 1-6 z 6
    Tytuł:
    Quadrupolar Magnetic Field Outside Antiferromagnetic Cr$\text{}_{2}$O$\text{}_{3}$
    Autorzy:
    Borovik-Romanov, A. S.
    Nizhankovskii, V. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964685.pdf
    Data publikacji:
    1997-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.-b
    75.25.+z
    75.50.Ee
    Opis:
    Predicted by Dzyaloshinskii quadrupolar magnetic field outside antiferromagnet was experimentally observed for Cr$\text{}_{2}$O$\text{}_{3}$ single crystal. The magnetic quadrupole sharply disappeared with heating the sample above T$\text{}_{N}$=317 K and appeared again on cooling below T$\text{}_{N}$. The obtained value of the magnetic quadrupole is in reasonable agreement with theoretical estimation.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 2; 371-374
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrogeological monitoring of karst activity based on regime observations in the territory of karst lakes
    Autorzy:
    Kuzichkin, Oleg R.
    Romanov, Roman V.
    Dorofeev, Nikolay V.
    Vasilyev, Gleb S.
    Grecheneva, Anastasia V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1844370.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    data processing algorithm
    geodynamics
    geoelectric facility
    hydrogeological monitoring
    karst lake
    phase-measuring method
    Opis:
    This article shows that the most sensitive indicator of local and regional karst activity in territories of apparent karst processes is the behaviour of karst lakes. The authors propose a hydrogeological monitoring methodology for the karst process based on the phase-measuring geoelectric control method in the coastal zone of karst lakes. The geoelectric current control of hydrogeological changes in the medium at local levels uses a multi-frequency vertical electric sounding combined with a phase-measuring method of registering the geoelectric signal. These proven methods permit to distinguish variations of spatial parameters and the electric conductivity of several layers at a time. Moreover, they significantly increase the noise resistance and sensitivity of the measuring system. An adaptive algorithm function of the measuring complex for geoelectric monitoring of karst lakes’ coastal zones was developed to control the operation of facilities and data collection systems. Based on an example of a lake where karst processes are active, the key zones of hydrogeological control were identified depending on karst manifestations. The research confirmed the possibility of local and regional monitoring of the development and forecasting of destructive karst-suffosion processes based on hydrogeological regime observations of karst lakes.
    Źródło:
    Journal of Water and Land Development; 2021, 48; 130-140
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The organisation of control over non-centralized water supply under the risk of groundwater dynamics disturbance in karst areas
    Autorzy:
    Kuzichkin, Oleg R.
    Romanov, Roman V.
    Dorofeev, Nikolay V.
    Grecheneva, Anastasia V.
    Vasilyev, Gleb S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1844418.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    electrical express-monitoring method
    hydrogeological control
    karst
    non-centralised water supply
    water quality
    Opis:
    The use of non-centralised water supply in remote settlements is currently the only possible option. Monitoring the water quality of such supply sources is a complicated task in such areas, especially when there are active karst processes and difficult groundwater conditions. The application of deterministic analytical models of water supply under the risk of disturbance to groundwater dynamics is not efficient. Significant quantitative and even qualitative changes in groundwater conditions may take place between the calculated points, and the underestimation of these changes in expectation-driven computation models may result in serious geoecological issues. This research studied and justifies the use of adaptive dynamic hydrogeological control in an area of non-centralised water supply based on the identification of key zones of geodynamic karst monitoring and the electrical express-monitoring of water resources. The identification of key zones is based on an integrated analysis of available groundwater information that describes changes in groundwater hydrodynamic conditions at the time of the karst forecast. The development of karst-suffusion processes is accompanied by more intense dynamic changes in local areas of geologic environment compared to the general variation in intensity. Information about the occurrence of destructive groundwater processes by means of selective geodynamic monitoring may thus be obtained much earlier than with environmental geodynamics monitoring as a whole. The experimental hydrogeological control of an area of non-centralised water supply was conducted on the right bank of the Oka River in Nizhny Novgorod region, a locality with an active manifestation of karst processes. Structure and algorithms of space-time processing of hydrogeological control data developed by authors have been used. The approach based on multifrequency vertical electrical sounding (MFVES) method has shown good correspondence with direct borehole observation when measuring depth of the first aquifer. Zones of unsafe water use have been revealed. The results demonstrated the effectiveness of the proposed method and the need for further regular observations of destructive groundwater processes by means of selective hydrogeodynamic monitoring.
    Źródło:
    Journal of Water and Land Development; 2020, 47; 113-124
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Progress in stellarator research at IPP-Kharkov
    Autorzy:
    Moiseenko, V. E.
    Lozin, O. V.
    Shapoval, A. M.
    Dreval, M. B.
    Kulyk, Y. S.
    Mironov, Y. K.
    Romanov, V. S.
    Pashnev, V. K.
    Sorokovoy, E. L.
    Petrushenya, A. A.
    Ozherel’ev, F. I.
    Kozulya, M. M.
    Konovalov, V. G.
    Maznichenko, S. M.
    Garkusha, I. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/146173.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    stellarator
    radio-frequency heating
    low frequency modes
    magnetic diagnostics
    Opis:
    A new antenna of ‘crankshaft’ type has been installed in the Uragan-2M device in order to increase the plasma density and heating below the ion cyclotron frequency. Antenna operation is modelled by 1D code, which solves boundary problem for time-harmonic Maxwell’s equations in radially non-uniform plasma cylinder. In recent experiments with this antenna, the SXR, CV, OV and OII emission measurements indicate that the light impurity radiation barrier is overcame at this device. Plasma with a temperature of ~50 eV exists during a short period of a few milliseconds. Then the radiation collapse comes owing to strong infl ux of impurities to the plasma column. A new magnetic diagnostics has been installed at Uragan-3M. Using it the poloidal magnetic fi eld is measured and the shift of toroidal current in major radius is registered. A miniature pinhole camera array for spatially and temporally resolved measurements of soft X-ray (SXR) plasma emission has been recently installed on the U-3M. Different shapes of the SXR emission profi le has been observed in different discharge conditions.
    Źródło:
    Nukleonika; 2016, 61, 2; 91-97
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The brushless permanent magnet micromotor in the smallest drive system
    Bezszczotkowy mikrosilnik z magnesami trwałymi w najmniejszym układzie napędowym
    Autorzy:
    Nesterin, V.
    Nesterina, A.
    Romanov, R.
    Scherbakov, A.
    Junin, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/159188.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    silnik bezszczotkowy
    silnik z magnesami trwałymi
    MEMS
    analiza matematyczna
    brushles motors
    permanent magnet motors
    mathematical analysis
    Opis:
    The article presents the results of the work of contactless fractional-horsepower motor (micromotor) with excitation from constant magnets, which can be used in MEMS (Micro-Electro-Mechanical Systems). These MEMS are used in Medicine, flaw detection, military equipment and in microrobots of different usage. Also article presents the results of mathematics Simulation of magnetic field in work zone of micromotor and the analysis of the basic datas and characteristics of experimental Sample with electronic device System control. The Sample of micromotor is made in the form of glass body with the usage of technology of making slim multi capillary glass tubes. The rotor of micromotor is made in the form cylinderic constant magnet from FeNdBr material. Basic datas: lengt – 6 mm; outside diameter - 2,5 mm; the number of phase - 3; rotation rates - 9600 rpm; stress (voltage, tension) - 0,5 V. Electronic unit (block) with microprocessor device realizes the work of micromotor in sensorless regime and allows to control the rotation speed in the rotation speed in the range 1:1000. The results of theoretical research agree with experimental datas, received in the process of experimental micromotor Sample.
    Artykuł przedstawia wyniki pracy dotyczącej bezstykowego silnika o mocy ułamkowej (mikrosilnika) ze wzbudzeniem od magnesów trwałych, który może być użyty w MEMS (Micro-Electro-Mechanical-Systems). MEMSy stosowane są w medycynie, detekcji wad, wyposażeniu wojskowym i różnych mikrorobotach. Praca przedstawia również wyniki matematycznej symulacji pola magnetycznego w strefie pracy mikrosilnika i analizę podstawowych danych i charakterystyk eksperymentalnego egzemplarza próbnego ze sterowaniem elektronicznym. Próbny egzemplarz jest wykonany w postaci korpusu ze szkła z użyciem technologii cienkich, multi - kapilarnych rurek szklanych. Wirnik mikrosilnika jest wykonany w postaci cylindrycznego magnesu trwałego wykonanego z FeNdBr. Podstawowe dane: długość – 6 mm, średnica zewnętrzna - 2,5 mm, liczba faz - 3, prędkość obrotowa - 9600 obr/min, napięcie - 0,5 V. Jednostka elektroniczna (blok) z mikroprocesorem realizuje pracę mikrosilnika w reżymie bezczujnikowym i pozwala sterować prędkość obrotową w zakresie 1:1000. Wyniki badań teoretycznych zgadzają się z danymi doświadczalnymi uzyskanymi w pracy eksperymentalnej mikrosilnika próbnego.
    Źródło:
    Prace Instytutu Elektrotechniki; 2009, 240; 231-240
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Post acceleration of ions emitted from laser and spark - generated plasmas
    Autorzy:
    Torrisi, L.
    Cavallaro, S.
    Rosiński, M.
    Nassisi, V.
    Paperny, V.
    Romanov, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146658.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    post ion acceleration
    laser plasma
    ion beam
    ion implantation
    Opis:
    Pulsed lasers at intensities of the order of 1010 W/cm2 interacting with solid matter in vacuum, produce hot plasmas at high temperatures and densities. The charge state distributions of the plasma generate a high electric field, which induces high ion acceleration along the normal to the target surface. The high yield of the emitted ions can generate a near constant current by using repetitive pulses irradiating thick targets. In order to increase ion energy, a post-acceleration system can be employed by using acceleration voltages above 10 kV. Special ion extraction methods can be employed to generate the final ion beam, which is multi-ionic and multi-energetic, due to the presence of different ion species and of different charge states. In this article four different methods of post ion acceleration, employed at the INFN-LNS of Catania, at the IPPLM of Warsaw, at the INFN of Lecce and at the LPI of Moscow, are presented, discussed and compared. All methods are able to implant ions in different substrates at different depth and at different dose-rates.
    Źródło:
    Nukleonika; 2012, 57, 3; 323-332
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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