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    Wyświetlanie 1-64 z 64
    Tytuł:
    Ecological Assessment of the Current State of Environmental Components on the Territory of the Impact of Cement Production Industry
    Autorzy:
    Strizhenok, A. V.
    Ivanov, A. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/124168.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    cement production industry
    cement dust
    environment
    pollution
    degradation of vegetation
    NDVI index
    deposition of dust
    Opis:
    The monitoring of the environmental components condition, exposed to the influence of the cement production enterprises, was the aim of the conducted research. One of the largest cement production factories in Russia, where the territory of negative impact has a total area of over 300 square kilometers, was the object of the study. The observations of the dust content in atmospheric air, as well as the determination of degradation degree of vegetation in the area of influence of the considered production facility were conducted. Chemical and granulometric composition of the cement dust, which is emitted in atmospheric air, were identified in the laboratory. Mapping model, which indicates the complex ecological welfare of the territory, exposed to the cement production industry, was compiled by the authors on the basis of the data, obtained in conducted research. The mapping model takes into account both the content of dust in near-ground atmosphere, and the extent of its deposition to soil, vegetation and surface water bodies.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 6; 160-165
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Dust Transfer Processes During Loading and Unloading Operations Using Software Simulation
    Autorzy:
    Smirnov, Y. D.
    Ivanov, A. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/123999.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    bunker
    dust suppression
    ANSYS
    simulation
    ROCKY
    hopper
    Opis:
    In order to limit dust transfer during the operations of material transportation at the factories of the construction industry, factories of the mineral and raw materials complex employ special dust suppression bunkers. These devices are structures located above a railway hopper (either a truck body or a conveyor). Through the input portal of the device, the transported material is transferred. Dusting can also be carried out under the bunkers from the side of the hopper, into which the material is poured. The design of dust suppression bins should be accompanied by a simulation of dust propagation processes. The simulation should be carried out in order to minimize the dust emissions and to select the optimum locations for the dust suppression sprayers.
    Źródło:
    Journal of Ecological Engineering; 2018, 19, 4; 29-33
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Information Support for Monitoring of the Sphere of Solid Municipal Waste Treatment
    Zaopatrzenie informacyjne monitorowania sfery obchodzenia się ze stałymi odpadami komunalnymi
    Autorzy:
    Ivanov, A. V.
    Balanowski, M. V.
    Fatykhov, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1815487.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    municipal waste
    effective management
    environment
    geo-information system
    monitoring of waste
    odpady komunalne
    efektywne zarządzanie
    ochrona środowiska
    system geoinformacyjny
    monitoring odpadów
    Opis:
    Organization of effective management of municipal waste is a complex management task, characterized by a multiplicity and heterogeneity of the factors that must be taken into account, and multistage associated with different content process applicable at each stage. To make effective management decisions we must to decide the problem of the availability of reliable and timely information. The geo-information system for monitoring and waste management can be seen as a higher-order system element, including for complex socio-eco-economic assessment of the status of the region. The main task of achieving economic efficiency of waste sorting is: "It must be economically profitable for population and management companies to sort waste and dispose them in different containers." To do this, the tariff for the export of unsorted waste containers should be maximized and the cost of removal of sorted waste should be minimal (ideally - zero). The results obtained have allowed significantly improve the capacity and effectiveness of the decisions made, in particular, on issues such as the optimization of traffic flows, division of human settlements into separate areas on a territorial basis and a reasonable preparation of technical tasks in the organization of tender procedures in the management system of sanitary clearing settlements.
    Organizacja efektywnego zarządzania odpadami komunalnymi jest złożonym zadaniem, które charakteryzuje się wielością i różnorodnością czynników, które muszą być brane pod uwagę. Jest to wieloetapowy proces związany z różnymi procesami technologicznymi mającymi zastosowanie na po-szczególnych etapach. Problem dostępności wiarygodnej i aktualnej informacji jest wspólny dla wszystkich etapów podejmowania skutecznych decyzji w zakresie obchodzenia się z twardymi odpadami komunalnymi. Geoinformacyjne systemy monitorowania i zarządzania odpadami mogą być postrzegane jako element wyższego rzędu systemowego, również dla kompleksowej oceny społeczno-ekologicznego i gospodarczego statusu regionu. Głównym zadaniem osiągnięcia efektywności ekonomicznej segregacji odpadów jest: „Ludność i spółki zarządzające, które muszą mieć korzyść z sortowania odpadów i wyrzucania ich do różnych pojemników”. Aby to zrobić, taryfy na wywóz nieposortowanych pojemników na odpady powinny być zmaksymalizowane, koszt usuwania odpadów segregowanych powinien być minimalnym (idealnie – zero). Otrzymane wyniki wskazują na znaczne poprawienie skuteczności podejmowanych decyzji szczególnie w takich kwestiach jak optymalizacja ruchu transportowego, podział na osobne obszary terytorium mieszkaniowego, bardziej uzasadnione przygotowania zadań technicznych w organizacji proce-dur przetargowych w systemie zarządzania sanitarnych oczyszczeń zamieszkałych obszarów.
    Źródło:
    Rocznik Ochrona Środowiska; 2016, Tom 18, cz. 1; 18-27
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Waste Properties of Subway Construction as a Potential Component of Soil Layer
    Autorzy:
    Ivanov, A. V.
    Smirnov, Y. D.
    Petrov, G. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/124091.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    subway
    waste
    soil
    landfill
    mine site
    hazard class
    total carbon
    moisture
    biotesting
    Chlorella algae
    Opis:
    The construction of subway stations is inevitably accompanied by the formation of a large amount of waste that is extracted from the underground workings by rock. When the waste is transported, the air is polluted with the exhaust gases of the dump trucks, some of the waste can stay on the road surface, the use of dump trucks increases the load on the roadway, the disposal of waste at landfills harms the environment, and enterprises pay fees for the transportation as well as placement of the waste. The article deals with the waste from the construction of new stations in the Saint-Petersburg subway. In order to determine the possibility of using waste in the municipal economy, a comprehensive analysis of this waste was carried out, including determination of moisture content, acidity, total carbon content, as well as chemical and granulometric composition. On the basis of the study results, it was established that the waste in question belongs to the hazard class 5, which enables to use it as a component of the soil mixture. Afterwards, the hazard class 5 was confirmed by the method of bioassay based on the determination of water toxicity by changing the optical density of the Chlorella algae culture.
    Źródło:
    Journal of Ecological Engineering; 2018, 19, 5; 59-69
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two bone fragments of ornithocheiroid pterosaurs from the Cenomanian of Volgograd region, Southern Russia
    Autorzy:
    Averianov, A O
    Kurochkin, E.N.
    Pervushov, E.M.
    Ivanov, A.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/21981.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Volgograd Region
    Cenomanian
    Cretaceous
    Pterosauria
    Russia
    Ornithocheiroidea
    bone fragment
    ornithocheiroid pterosaur
    pterosaur
    paleontology
    Opis:
    Two pterosaur bone fragments, a distal humerus and a distal femur, from the upper Cenomanian of the Volgograd Region in the Don River basin of southern Russia are reported. Although fragmentary, these bones come from mature individuals and are exceptionally well and three−dimensionally preserved, allowing a detailed description of their anatomy. Both specimens can be referred to a middle−sized ornithocheiroid pterosaur with a reconstructed wingspan of about 4 m. The humerus shows affinities with Istiodactylus from the Barremian of England, whereas the femur fragment is not identifiable beyond Ornithocheiroidea indet.
    Źródło:
    Acta Palaeontologica Polonica; 2005, 50, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mirotvorčeskaja dejatel'nost' OON na sovremennom etape
    Autorzy:
    Ivanov, V.
    Grinenko, A.
    Powiązania:
    Zarubežnoe Voennoe Obozrenie 1994, nr 10, s. 2-4
    Data publikacji:
    1994
    Tematy:
    ONZ misje pokojowe 1993-1994 r.
    Siły pokojowe ONZ organizacja 1993-1994 r.
    Konflikty zbrojne zapobieganie polityka 1993-1994 r.
    Opis:
    Działalność ONZ w latach 1993-1994 w zakresie rozwiązywania konfliktów regionalnych i utrzymywania pokoju. Podstawa prawna prowadzenia wojskowych misji pokojowych. Prace nad koncepcją stopniowego formowania rezerwowych sił ONZ, gotowych do operacyjnego rozwijania w różnych regionach świata i udziału w nowych lub już prowadzonych operacjach pokojowych.
    Fot., schem.
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    Application of Carbonaceous Household Wastes as Fuel Feedstock at Thermo Metallurgical Equipment and Processes
    Autorzy:
    Boikov, A. V.
    Ivanov, P. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/952349.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    MSW
    ecology
    thermal treatment
    RDF
    conveyor kiln
    Opis:
    The possibility of utilization of municipal solid waste in the conveyor roasting cement production machine along with obtaining secondary thermal energy, what could reach 15-20% of the principal quantity of the heat energy required for the conduct of the process was considered. The inclusion of ash obtained from the incineration of municipal solid waste after preprocessing into the cement clinker composition was proposed. The reduction of the emission of dioxins and furans in the atmosphere and the impact on the environment was achieved as a result.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 3; 18-21
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wielkie pozary w lasach wschodniej Syberii i ich wplyw na proces tworzenia sie lokalnych chmur burzowych
    Autorzy:
    Ponomarev, E.
    Ivanov, V.A.
    Byckov, V.A.
    Powiązania:
    https://bibliotekanauki.pl/articles/45655.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    chmury burzowe
    oddzialywanie na srodowisko
    lasy
    Syberia
    monitoring
    pozary wielkoobszarowe
    pozary lasow
    lesnictwo
    wyladowania atmosferyczne
    Źródło:
    Leśne Prace Badawcze; 2005, 4; 19-28
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stymulowanie personelu na podstawie zrównoważonego systemu wskaźników (BSC)
    Staff encouragement based on the balanced scorecard
    Autorzy:
    Ivanov, A.
    Szkarowski, A.
    Nikolaeva, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819670.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    zrównoważony system wskaźników
    dobór personelu
    kierunki rozwoju firmy
    balanced system of indicators
    personnel selection
    business trends
    Opis:
    Przejście od intuitywnych i sytuacyjnych metod zarządzania do managementu naukowego jest jednym z warunków wyprowadzania przedsiębiorstw z sytuacji kryzysowych. Jak wynika z doświadczenia światowego, efektywną metodą stworzenia, wdrożenia i kontroli przedsiębiorczości jest system Balanced Scorecard (BSC) - Zrównoważony System Wskaźników rozwoju firmy. Celem niniejszej publikacji jest rozpatrzenie istoty i znaczenia tego systemu w strategicznym zarządzaniu przedsiębiorstwem oraz analiza zalet nowego podejścia, jako narzędzia w stymulowaniu pracy personelu. Należy zauważyć, że w specjalistycznej terminologii krajowej często używana jest nieprawidłowa definicja "Zrównoważona Karta Wyników". Stosowanie terminu "wynik" zamiast "wskaźnik" jest według autorów nie do przyjęcia, ponieważ wynik oznacza końcowy rezultat działalności, natomiast stosowanie BSC oznacza strategię zarządzania w celu osiągnięcia przyszłych wyników. Również bezpośrednie tłumaczenie słowa "Card" w oderwaniu od "Scorecard" jest typowym błędem, ponieważ w obróbce danych całe to słowo tłumaczy się, jako "System Wskaźników". Aby uniknąć niepotrzebnych rozbieżności w terminologii autorzy zostają przy definicji "Zrównoważony System Wskaźników", stosując przy tym angielski skrót BSC.
    An effective method of creation, adaptation and control of entrepreneur-ship is the Balanced Scorecard (BSC) of a company development. The (BSC) is semi-standard structured report supported by proven design methods and automation tools. It can be used by managers to keep track of the execution of activities by staff within -their control and monitor the consequences arising from these actions. It is perhaps the best known of several such frameworks, and was widely adopted in the world. The concept of the BSC is based on forming a company development strategy and its subsequent realization with consideration of the current results of the key directions of the company's activities. In practice, it is a strategic performance management tool and mechanism of consistent understanding by the personnel of the strategic goals of the company and of the controls of their achievement through the so called Key Performance Indicator (KPI). Those indicators are the measure of the goals' achievability and, also, the characteristics of the business processes and of the work of each individual employee. The core characteristic of the BSC and its derivatives is the presentation of a mixture of financial and non-financial measures each compared to a 'target' value within a single concise report. The report is not meant to be a replacement for traditional financial or operational reports, rather a succinct summary that captures the information most relevant to those reading it. It is the methods by which this 'most relevant' information is determined (i.e. the design processes used to select the content) that most differentiates the various versions of the tool in circulation. This ideology has been known for a long time and an opinion is widespread that there is no need of developing any new strategies of management. It is enough to study the existing models of strategy that are widely known and described in literature (Table 1). By using those strategies, one is able to create their own that is the most appropriate for the particular conditions of activity. The BSI system has four projections, each of which is associated with the key questions of functioning of the company. The answers to those questions are the objectives, the achievement of which will be the evidence of progress on the way to realization of the whole strategy of development (Table 2). Mutual dependencies must be established between those projections as well as the order of realization of the key directions of the company's activity. An example of the objective development scheme for particular projections is depicted in Drawing 1. Certain methods and tricks have been developed within the BSI for the purpose of effective solution of those questions. First of all, the BSI methodology has convenient and graphic tool -the Strategic Map. This Map describes the cause-effect relations between the strategic goals according to the key development prospects: finances, clients, business processes and personnel (Table 3). The other important tool of the BSI is the Strategic Topic. It is the consolidated group of identical goals and indicators of the activity effectiveness. Such combination of indicators allows making the strategy more understandable and accessible.
    Źródło:
    Rocznik Ochrona Środowiska; 2010, Tom 12; 219-234
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Hall Effect in a Two-Dimensional Electron Gas with Strong Rashba Spin-Orbit Interaction: Semiclassical Keldysh Approach
    Autorzy:
    Dyrdał, A.
    Barnaś, J.
    Ivanov, V.
    Dugaev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1403654.pdf
    Data publikacji:
    2012-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.-b
    72.25.Dc
    75.70.Tj
    Opis:
    Spin Hall effect in a two-dimensional electron gas with the Rashba spin-orbit interaction is analyzed theoretically. We use the Keldysh technique for nonequilibrium processes, modified in order to take into account well-defined splitting of the Fermi surface due to strong spin-orbit coupling. Using such an approach, we reconsider the two-dimensional electron gas with the Rashba spin-orbit interaction and show that impurity scattering processes suppress the spin Hall effect.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 6; 1059-1061
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of the RT$\text{}_{2}$X$\text{}_{2}$, RTX$\text{}_{2}$ and RTX Compounds in High Magnetic Fields
    Autorzy:
    Szytuła, A.
    Ivanov, V.
    Vinokurova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929858.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    Opis:
    Magnetization curves up to 140 kOe have been measured in the temperature range 4.2-100 K on polycrystalline oriented samples for some RT$\text{}_{2}$X$\text{}_{2}$, RTX$\text{}_{2}$ RTX compounds. The magnetic phase diagrams for all samples are determined.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 293-296
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of NdCo$\text{}_{2}$Si$\text{}_{2}$, TbCo$\text{}_{2}$Si$\text{}_{2}$ and DyCo$\text{}_{2}$Si$\text{}_{2}$ in High Magnetic Fields
    Autorzy:
    Ivanov, V.
    Vinokurova, L.
    Szytuła, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920794.pdf
    Data publikacji:
    1992-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    Opis:
    The magnetic properties of RCo$\text{}_{2}$Si$\text{}_{2}$ (R = Nd, Tb, Dy) compounds were studied by measuring the high-field magnetization in magnetic fields up to 140 kOe and over the temperature range 4.2-45 K. The magnetic field induces in NdCo$\text{}_{2}$Si$\text{}_{2}$ three metamagnetic phase transitions and two transitions in TbCo$\text{}_{2}$Si$\text{}_{2}$ and DyCo$\text{}_{2}$Si$\text{}_{2}$ compounds.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 6; 693-698
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of Excess Regenerative Energy in Electric Transport Systems on the Basis of Fuzzy Logic Application
    Autorzy:
    Sablin, O.
    Kuznetsov, V.
    Shinkarenko, V.
    Ivanov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/223524.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric transport
    regeneration of the electric power
    stores
    inverters
    regulation of voltage
    traction
    external power supply
    fuzzy logic
    transport elektryczny
    regeneracja energii elektrycznej
    magazyny
    falowniki
    regulacja napięcia
    trakcja
    zasilanie zewnętrzne
    logika rozmyta
    Opis:
    Purpose. To develop the fuzzy model of distribution of excess regenerative energy in traction and external power supply systems allowing to exercise effective operation of the power equipment. Relevance. For effective distribution of excess regenerative energy in systems of electric transport, as well as for systems equipped with stationary stores of energy and inverting traction substations with regulators of output voltage it is necessary to solve a number of the problems with high degree of uncertainty demanding taking into account a set of random factors such as the modes of power lines and traction loadings. These factors have to be considered in operation for choosing the rational modes of energy stores, inverters and regulators of voltage on buses of substations to provide the rational conditions for energy regeneration on electric transport. Scientific novelty. The control system of energy storage devices, inverters and traction substation output voltage regulators, designed on the basis of fuzzy logic, can provide the necessary conditions for the regeneration on electric transport on sections with a shortage of traction power consumption and allows to optimize the distribution of excess braking energy of transport vehicles. It is achieved by determining the rational relationship between the components of the excess current of regeneration in real time, which can ensure a minimum of power losses of regenerative energy in traction and external power supply systems. Practical importance. The use of the developed approach is effective under the conditions of incomplete information received by measurement systems and on the basis of additional studies it can allow to minimize rated capacity of stores, inverters and traction substation output voltage regulators that could reduce the costs of modernization of existing sections and electrification of new electric transport systems.
    Źródło:
    Archives of Transport; 2017, 42, 2; 53-63
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical description of technological process for primary fish processing
    Matematyczny opis procesu technologicznego obróbki wstępnej ryb
    Autorzy:
    Fatychov, J.
    Evtropkov, V.
    Ivanov, A.
    Dutkiewicz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/288836.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    technological process
    technological operation
    topological model
    functional graphs
    proces technologiczny
    operacja technologiczna
    model topologiczny
    graf funkcjonalny
    Opis:
    The paper discusses an approach to the question of the possibility of a mathematical description of discrete processes. On the basis of these processes a large class of manufacturing equipment – production lines and systems for the processing of fish was generated. The use of mathematical models in the early stages of the design will improve the efficiency and quality of the produced equipment and reduce the risks and costs during the design work. We propose to describe the processes of fish processing by topological models that are presented in the form of functional graphs. Overall, the proposed approach will develop new design methods of fish processing equipment.
    W pracy omówiono podejście do kwestii możliwości matematycznego opisu dyskretnych procesów. Na podstawie tych procesów tworzona jest szeroka gama urządzeń przemysłowych - linie produkcyjne i systemy do przetwarzania ryb. Wykorzystanie modeli matematycznych we wczesnych etapach tworzenia może poprawić wydajność i jakość wytwarzanych maszyn i zmniejszenia ryzyka oraz koszty podczas prac projektowych. Zaproponowano opis procesów przetwórstwa ryb z wykorzystaniem modeli topologicznych, które są prezentowane w postaci wykresów funkcjonalnych. Ogólnie rzecz biorąc, proponowane podejście umożliwi opracowanie nowych metod projektowania urządzeń przetwórstwa rybnego.
    Źródło:
    Inżynieria Rolnicza; 2013, R. 17, nr 4, t. 2, 4, t. 2; 31-37
    1429-7264
    Pojawia się w:
    Inżynieria Rolnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SU(2) Coherent State Path Integral Investigation of the Holstein Dimer
    Autorzy:
    Hakioğlu, T.
    Ivanov, V. A.
    Zhuravlev, M. Ye.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013732.pdf
    Data publikacji:
    2000-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Db
    71.36.+c
    64.60.Ak
    Opis:
    The SU(2) coherent state path integral is used to investigate the partition function of the Holstein dimer. This approach naturally takes into account the dynamical symmetry of the model. The ground-state energy and the number of the phonons are calculated as functions of the parameters of the Hamiltonian. The renormalizations of the phonon frequency and electron hopping for bonding and antibonding states are considered. The destruction of quasiclassical mean field solution is discussed.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 5; 927-930
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Microscopic Mechanisms of Blue Anti-Stokes Luminescence in Undoped and Chromium Doped ZnSe Crystals
    Autorzy:
    Ivanov, V. Yu.
    Omel'chuk, A.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1991537.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    78.55.Et
    76.30.Fc
    Opis:
    Anti-Stokes luminescence is observed in chromium doped and in undoped ZnSe crystals. In the former case anti-Stokes luminescence is due to two complementary ionization transitions of Cr ions. In the latter case two-photon absorption becomes important at a high excitation density.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 365-368
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of nanocomposite magnetic compounds based on layered semiconductors by means of electrochemical intercalation in a gradient magnetic field
    Autorzy:
    Boledzyuk, V.
    Bakhtinov, A.
    Kovalyuk, Z.
    Kudrynskyi, Z.
    Ivanov, V.
    Slyn'ko, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1159217.pdf
    Data publikacji:
    2016-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Tx
    81.05.Hd
    81.40.Rs
    Opis:
    In this paper we propose a method of intercalation of layered single crystals with atoms of 3d-metals in a magnetic-field gradient. We report on structure properties of Co_{x}InSe and Co_{x}In₂Se₃ layered crystals intercalated by cobalt. It was established that ferromagnetic ordering at room temperature is observed in the intercalated crystals. The crystals are a nanocomposite material that consists of a layered matrix and arrays of Co nanoformations on the van der Waals surfaces of InSe and In₂Se₃ layers.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 3; 773-777
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined (ZnSe/MgS)/ZnCdSe Bragg Reflectors Grown Using ZnS as a Sulphur Source
    Autorzy:
    Solnyshkov, D. D.
    Sorokin, S. V.
    Sedova, I. V.
    Toropov, A. A.
    Ivanov, S. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044540.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.40.Fy
    Opis:
    We report on MBE growth and study of optical and structural properties of (ZnSe/MgS)/ZnCdSe distributed Bragg reflectors with λ=520 nm and R$\text{}_{max}$=97%. The samples were grown pseudomorphically on GaAs substrate using ZnS as a sulphur source. Scanning electron microscopy, X-ray diffraction, and optical measurements showed good optical and structural characteristics of the Bragg reflectors.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 873-877
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chondrichthyan spines from the Famennian (Upper Devonian) of Russia
    Autorzy:
    Lebedev, Oleg A.
    Ivanov, Alexander O.
    Linkevich, Valeriy V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1835588.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chondrichthyes
    Ctenacanthiformes
    Euselachii
    Fin spines
    Famennian
    Devonian
    Russia
    ryby chrzęstnoszkieletowe
    famen
    dewon
    Rosja
    Opis:
    Very rare chondrichthyan spines from the Famennian (Upper Devonian) of European Russia are referred here to ctenacanthiforms, euselachians and a chondrichthyan group of uncertain systematic position. Ctenacanthus Agassiz, 1837 is recorded from the lower and middle Famennian of the central and north-western parts of the area. Sculptospina makhlaevi Lebedev gen. et sp. nov. originates from the lower Famennian of the Lipetsk Region. The holotype of ‘Ctenacanthus’ jaekeli Gross, 1933 and a new specimen from the upper Famennian of the South Urals are shown to belong to the same taxon, which is transferred to Acondylacanthus St. John and Worthen, 1875. New specimens of Tuberospina nataliae Lebedev, 1995 from the upper Famennian of Central Russia are described in detail. The newly presented material increases our knowledge of the composition of Famennian marine assemblages from the East European Platform. It is suggested that these assemblages may be classified as chondrichthyan-dominated and dipnoan-dominated. Hypothetically, after the end- Devonian Hangenberg extinction event, which affected numerous secondary consumers in vertebrate communities, some chondrichthyan groups could have encroached to take advantage of previously occupied ecological niches. Ctenacanthus, as well as Acondylacanthus and Amelacanthus survived the end-Devonian mass extinction to continue into the Carboniferous.
    Źródło:
    Acta Geologica Polonica; 2020, 70, 3; 339-362
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Relaxation Processes in Quantum Well Structures of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te/Cd$\text{}_{1-x}$Mg$\text{}_{x}$Te
    Autorzy:
    Khachapuridze, A.
    Ivanov, V. Yu.
    Godlewski, M.
    Karczewski, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035595.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Ji
    72.25.Rb
    76.70.Hb
    78.55.Et
    Opis:
    Fast spin relaxation of Mn$\text{}^{2+}$ ions in a magnetic quantum well of CdMnTe with 1% Mn fraction is related to a very efficient spin-flip interaction between Mn ions and free carriers. This mechanism of spin relaxation becomes dominant at increased excitation densities. The observed response of the photoluminescence bands to the Mn$\text{}^{2+}$ magnetic resonance indicates that free carriers are heated at the magnetic resonance conditions. A decrease in formation/recombination rates of free and trion excitons is observed. Donor bound exciton photoluminescence is enhanced, which we relate to delocalization of free excitons, caused by interaction with microwave heated free carriers.
    Źródło:
    Acta Physica Polonica A; 2002, 102, 4-5; 643-648
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Peculiarities of Composition and Temperature Dependence of Energy-Band Parameters of Zn$\text{}_{x}$Cd$\text{}_{y}$Hg$\text{}_{1-x-y}$Te
    Autorzy:
    Andrukhiv, A.
    Ivanov-Omskii, V.
    Polit, J.
    Sheregii, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1876920.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.25.Tn
    Opis:
    The influence of addition of Zn on band parameters of Zn$\text{}_{x}$Cd$\text{}_{y}$Hg$\text{}_{1-x-y}$Te solid solution at different temperatures (4.2-200 K) was investigated. The cyclotron resonance at 4.2 K and magnetophonon resonance at 77-200 K were used to determine band structure parameters. The temperature dependence of band structure parameters (energy gap, effective mass of electron) for the composition of series of epilayers (x varied in 0.08-0.20 range and y - 0.07-0.12) was obtained. It is found that band structure parameters for some compositions (for example x = 0.17, y = 0.08) are almost independent from temperature and equal: γ₁$\text{}^{L}$= 19.55, γ₂$\text{}^{L}$ = γ₃$\text{}^{L}$ = 8.5, K$\text{}^{L}$ = 6.48, F = -0.5, E$\text{}_{g}$ = 0.35 eV, E$\text{}_{p}$ = 17.9 eV. The effective mass of electrons was found to be greater with addition of Zn while the effective mass of heavy holes is left unchanged.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 513-517
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronic and Transport Properties of Ragsn (R=Ce,Pr,Nd,Dy) Compounds
    Autorzy:
    Fus, D.
    Ivanov, V.
    Jezierski, A.
    Penc, B.
    Szytuła, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014428.pdf
    Data publikacji:
    2000-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.-b
    72.15.Eb
    79.60.-i
    Opis:
    The electronic structure of the ternary RAgSn (R=Ce,Pr,Nd,Dy) compounds which crystallize in the hexagonal LiGaGe-type structure was studied by X-ray photoemission spectroscopy. Core-levels and valence bands were investigated. The X-ray photoemission spectroscopy valence bands are compared with the ones calculated using the spin-polarized tight-binding linear muffin-tin orbital method. The obtained results indicate that the valence bands are mainly determined by the Ag 4d band. The spin-orbit splitting values Δ$\text{}_{SO}$ determined from the XPS spectra of 3d$\text{}_{5}\text{}_{/}\text{}_{2}$ and 3d$\text{}_{3}\text{}_{/}\text{}_{2}$ are equal to 18.8eV for R= Ce, 20.2eV for R = Pr and 22.6eV for R = Nd. The analysis of these spectra on the basis of the Gunnarsson-Schönhammer model gives a hybridization of f orbitals with the conduction band. The calculation of the total energy for two models of the crystal structure: an ordered of the LiGaGe-type and a disordered one of the CaIn$\text{}_{2}$-type indicate that in these compounds the LiGaGe-type structure is stable. Additionally, the temperature dependences of the electrical resistivity of CeAgSn and DyAgSn are investigated. At high temperatures the resistivity is not a linear function of temperature which indicates an electron-phonon interaction in the presence of a small s-d scattering, whereas at low temperatures anomalies connected with the magnetic phase transitions are observed.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 5; 571-586
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The improvement of the rheological model for controlling the stress-strain state and humidity in the materials of museum pieces: zener thermodiffusion model for capillary-porous bodies
    Autorzy:
    Dovhaliuk, V. B.
    Chovnyuk, Y. V.
    Ivanov, E. A.
    Shyshyna, M. O.
    Powiązania:
    https://bibliotekanauki.pl/articles/114762.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    aftereffect
    colloid capillary-porous bodies
    deformations
    heat and mass transfer
    Ishlinskiy - Rzhanitsin generalized rheological model of the elastic-viscous body
    Zener thermodiffusion rheological model
    model reologiczny
    model termodyfuzji Zenera
    ciało kapilarno-porowate
    transfer ciepła
    transfer masy
    Opis:
    The drying and humidifying processes of capillary-porous (colloid) bodies occur during the production of various materials for the consumer goods industry, building materials, storage of museum pieces, etc. It is known that the main linkage forms of the moisture and colloid capillary-porous bodies (CCPBs), namely adsorption, capillary condensation and capillary linkage of the free moisture in the cavities of the above bodies, depend on the temperature and relative humidity of drying/humidifying agent. It means that the CCPBs behave in a peculiar way depending on the temperature and humidity fields. The problems of CCPBs drying (or humidifying) process include the issue of the heat and humidity transfer both in the middle of the body and in the boundary layer on the interface of phases “body (object of drying/humidifying process) – environment”. The drying/humidifying intensity is at its maximum when the possibilities of the heat and mass transfer in the boundary layer correspond to the possibilities of moisture and heat moving inside the object of drying/humidifying process. The properties of the CCPB as material possessing specific elastic-viscous properties are described within the framework of O.Y. Ishlinskiy - O.R. Rzhanitsin generalized elastic-viscous body theory. A comparative analysis of the above mentioned CCPB’s properties from the point of view of Zener thermodiffusion theory is conducted. The mechanism of moisture transferring from the CCPBs’ central layers (as object of drying/humidifying process) up to their surfaces is developed. The theoretical researches examined the drying/humidifying phenomena for both the entire volume of the CCPB and three structural directions. It is noted that drying/humidifying of CCPBs is a complicated heat and mass transfer process accompanied by mechanisms of molecular nature determining the kinetics of their running. It is shown that the appropriate equations’ solution of molecular-molar heat and moisture transfer under the appropriate boundary (limit) conditions allows to describe the fields, i.e. the distribution of transfer potentials (the temperature and moisture content in the CCPB as object of drying/humidifying) at any time of the appropriate process. The drying/humidifying curves (“drying/humidifying rate versus CCPB humidity”) and the temperature curves (“CCPB temperatures versus CCPB humidity”) reflect the nature of the drying/humidifying processes. In the framework of the proposed generalized rheological model of CCPB, the residual deformations of bodies for various load types (the time-varying stress applied to the CCPB) is estimated.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2019, 2 (11); 51-71
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    0.2-kJ and 2-kJ high rep rate Dense Plasma foci : their design, technology, and applications
    Autorzy:
    Dubrovsky, A. V.
    Gribkov, V. A.
    Ivanov, Y. P.
    Lee, P.
    Lee, S.
    Liu, M.
    Samarin, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146546.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasma focus (DPF)
    DPF installation
    miniature focus chamber
    soft and hard X-ray radiation
    Opis:
    The paper presents various designs of several medium and small size Dense Plasma Focus (DPF) chambers intended for numerous applications, a description of technologies used in these facilities, and some results reached with these devices by using a number of diagnostic techniques. In present experiments the DP foci have been used mainly as an X-ray source. We discuss here how it is possible to satisfy absolutely new and very strict demands on the construction and technology for the devices to be eventually applied in science and industry. Between these characteristics there are a high repetition rate (typically 1…15 Hz) and a long lifetime (over 1 million shots). Their switching elements, a collector and chambers must withstand a high quasi-continuous heat load (up to 100 kW). High energy density in the central part of the chamber anode and the necessity to provide a channel for radiation extraction demanded a special construction and specific materials implementation in this region. Their X-ray spectrum should be tuned. They have to operate with different working gases and preferably in a wide range of pressures. All these points are discussed in this report. Capabilities of the described techniques are illustrated by results of the recent experimental studies carried out with facilities located at the Nanyang Technological University (NX1) as well as at the Lebedev Physical Institute (PF-0.2).
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 107-111
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cd(Mg)Se Single Layers and CdSe/CdMgSe Heterostructures Grown by Molecular Beam Epitaxy on InAs(001) Substrates
    Autorzy:
    Kaygorodov, V. A.
    Sorokin, V. S.
    Sedova, I. V.
    Nekrutkina, O. V.
    Sorokin, S. V.
    Shubina, T. V.
    Toropov, A. A.
    Ivanov, S. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028799.pdf
    Data publikacji:
    2001-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    Opis:
    We report on molecular beam epitaxy of CdSe/CdMgSe heterostructures on InAs(001) substrates and studies of their optical and structural properties. The CdMgSe energy gap versus composition dependence is determined. The zinc-blende MgSe band-gap energy and optical bowing parameter are estimated to be 4.05 eV and 0.2 eV, respectively. The CdSe quantum wells embedded into CdMgSe barriers demonstrate intense photoluminescence. Effective mass approximation calculations of electron-heavy hole optical transitions in CdSe quantum well are in a good agreement with the experimental data obtained.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 3; 443-450
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoemission Electronic States of (Mn$\text{}_{1-x}$Fe$\text{}_{x}$)$\text{}_{5}$Si$\text{}_{3}$
    Autorzy:
    Penc, B.
    Zalecki, R.
    Jezierski, A.
    Szytuła, A.
    Kołodziejczyk, A.
    Ivanov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043378.pdf
    Data publikacji:
    2005-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.20.Gj
    71.15.Ap
    Opis:
    The core-level and valence band electronic states studies of single crystalline transition metal silicides (Mn$\text{}_{1-x}$Fe$\text{}_{x}$)$\text{}_{5}$Si$\text{}_{3}$ (x=0 and 0.05) by the X-ray and ultraviolet photoemission spectroscopies are reported. The Mn 2p core-level spectra for both compounds were ascribed to the relevant Mn sites in their crystal structure. The valence band spectra were compared with the result of ab-initio band calculations using the tight-binding linear muffin-tin orbital method. It was concluded that the enhancement of the spectral density within the 2 eV binding energy region below the Fermi energy comes from the effect of strongly correlated Mn 3d electrons.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 6; 967-976
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chondrichthyan spines from the Famennian (Upper Devonian) of Russia
    Autorzy:
    Lebedev, Oleg A.
    Ivanov, Alexander O.
    Linkevich, Valeriy V.
    Powiązania:
    https://bibliotekanauki.pl/articles/139186.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chondrichthyes
    Ctenacanthiformes
    Euselachii
    Fin spines
    Famennian
    Devonian
    Russia
    ryby chrzęstnoszkieletowe
    famen
    dewon
    Rosja
    Opis:
    Very rare chondrichthyan spines from the Famennian (Upper Devonian) of European Russia are referred here to ctenacanthiforms, euselachians and a chondrichthyan group of uncertain systematic position. Ctenacanthus Agassiz, 1837 is recorded from the lower and middle Famennian of the central and north-western parts of the area. Sculptospina makhlaevi Lebedev gen. et sp. nov. originates from the lower Famennian of the Lipetsk Region. The holotype of ‘Ctenacanthus’ jaekeli Gross, 1933 and a new specimen from the upper Famennian of the South Urals are shown to belong to the same taxon, which is transferred to Acondylacanthus St. John and Worthen, 1875. New specimens of Tuberospina nataliae Lebedev, 1995 from the upper Famennian of Central Russia are described in detail. The newly presented material increases our knowledge of the composition of Famennian marine assemblages from the East European Platform. It is suggested that these assemblages may be classified as chondrichthyan-dominated and dipnoan-dominated. Hypothetically, after the end- Devonian Hangenberg extinction event, which affected numerous secondary consumers in vertebrate communities, some chondrichthyan groups could have encroached to take advantage of previously occupied ecological niches. Ctenacanthus, as well as Acondylacanthus and Amelacanthus survived the end-Devonian mass extinction to continue into the Carboniferous.
    Źródło:
    Acta Geologica Polonica; 2020, 70, 3; 339-362
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Absorption in Periodic InN:In Structures
    Autorzy:
    Plotnikov, D. S.
    Shubina, T. V.
    Jmerik, V. N.
    Semenov, A. N.
    Ivanov, S. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047375.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.-w
    71.45.Gm
    Opis:
    Optical absorption measurements were exploited to study periodic InN:In structures grown by plasma-assisted molecular beam epitaxy with the thickness of the metallic inclusions varied from 2 to 48 monolayers. We demonstrate that the observed higher-energy shift of an effective absorption edge may be due to In depletion of the InN matrix via the coalescence of In into large clusters, accompanied by the respective higher-energy shift of the Mie resonance. The relevant uncertainty in the optical gap of InN is discussed.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 191-196
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Growth Control of N-Polar GaN in Plasma-Assisted Molecular Beam Epitaxy
    Autorzy:
    Mizerov, A.
    Jmerik, V.
    Kaibyshev, V.
    Komissarova, T.
    Masalov, S.
    Sitnikova, A.
    Ivanov, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811962.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    81.05.Ea
    81.15.Hi
    Opis:
    The paper reports on plasma-assisted MBE growth of good quality N-face GaN layers directly on c-Al₂O₃ substrates. Growth kinetics under different growth conditions (substrate temperature, Ga to activated nitrogen flux ratio, etc.) during deposition of GaN(0001) and GaN(0001̅) both by the ammonia-based MBE or plasma-assisted MBE was studied. It was found that atomically smooth surface of 1 μm thick GaN(0001̅) films can be achieved by plasma-assisted MBE at the relatively high substrate temperature $T_S$ ≈ 760°C and Ga to activated nitrogen flux ratio $F_Ga//F_N^\ast$ ≈ 1.8.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1253-1258
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dense Plasma Focus as a powerful source of monochromatic X-ray radiation
    Autorzy:
    Dubrovsky, A.
    Gribkov, V.
    Ivanov, Y.
    Karpiński, L.
    Orlova, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147444.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasma focus (DPF)
    X-ray generation
    X-ray dosimetry
    exposure dose
    absorbed dose
    Opis:
    A review of some experimental results obtained using the dense plasma focus (DPF) device PF-1000 is presented. The copper Ka1,2 radiation line generated by DPF in the case of device anode made of copper was the main object of this study. The predominance of this characteristic radiation over other kinds of radiation in the DPF X-ray spectrum is shown. A brief description of a new DPF 6.0 device as well as a radioenzymology experiment carried out within this device is presented.
    Źródło:
    Nukleonika; 2006, 51, 1; 21-28
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the pulse plasma stream
    Autorzy:
    Evtikhin, V. A.
    Lyublinsky, I. E.
    Vertkov, A. V.
    Ivanov, L. I.
    Ivanov, Y. P.
    Krokhin, O. N.
    Nikulin, V. Y.
    Polukhin, S. N.
    Safronova, T. V.
    Tikhomirov, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/148327.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    interaction of plasma with matter
    lithium capillary porous system
    plasma dynamics
    plasma focus
    thermonuclear reactor
    Opis:
    In this report we present a first series of tests of the lithium Capillary Porous System (CPS). We suppose that such a system can be used as a first wall in a thermonuclear reactor. The main goal of the presented work was to study the behavior of the lithium CPS in the condition simulating the influence of plasma in various operating regimes of the thermonuclear reactor. The tests were conducted in a Plasma Focus (PF) installation. The preliminary analysis of the received results confirms the high resistance of the lithium CPS to the pulse influence of plasma flows.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 113-115
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Polarization of Onsager Fluids. II. Birefringence. 3. Role of Universal Pairwise Interactions
    Autorzy:
    Prezhdo, V. V.
    Tarasova, G. V.
    Prezhdo, O. V.
    Tyurin, S. A.
    Akulova, O. N.
    Ivanov, N. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1943971.pdf
    Data publikacji:
    1996-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.70.Dk
    78.20.Fm
    72.80.Jc
    Opis:
    A comparative analysis of several methods of interpretation of solvent influence on molar Kerr constants of solutes was done. The analysis was based on experimentally determined electro-optical and dielectric properties of binary solutions of organic substances with various polarities, polarizabilities and optical anisotropies. It was found that the role of universal van-der-Waals interactions treated via London-Debye-Keesom potentials was best accounted for by a modified orientational theory of Kerr effect that developed the ansatz of reactive field and local dielectric permittivity. An extrapolation method of determination of gas phase molar Kerr constants of solutes was deduced from the theory.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 1; 47-59
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of fractal analysis and phase trajectories for the improvement of identification of complex technical systems
    Autorzy:
    Chovnyuk, Y. V.
    Gumenyuk, Y. O.
    Djachenko, L. A.
    Ivanov, E. A.
    Kravchyuk, V. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/114794.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    fractal analysis
    improvement
    methods
    phase trajectories
    qualitative analysis
    analiza fraktalna
    trajektoria fazowa
    analiza jakościowa
    Opis:
    The procedure of the qualitative analysis of complex technical systems is discussed. One may use such methods of analysis for time series characterized the functioning of such systems. These time serious aren’t confirmed the hypothesis of trend existence. One may use at this qualitative analysis the methods of nonlinear dynamics and the theory of chaos. The basis for similar researches is Takens’s theorem. The randomness of the studied dynamical system as the model of the complex technical system given by time realizations is established by means of Lyapunov’s indicator. The state stability is estimated by Hausdorf’s fractal dimension and the fractality index. Visual evaluation of the time series was carried out by means of the phase trajectory restoration procedure. As a result of the analysis of the phase points in the phase space the split attractor is indicated, which gives the chance to speak about its bifurcation.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2019, 2 (11); 41-50
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric Polarization of Onsager Fluids. I. Dipole Polarization. 3. The Role of Universal Pairwise Interactions
    Autorzy:
    Prezhdo, V. V.
    Tarasova, G. V.
    Prezhdo, O. V.
    Τyurin, S. A.
    Ivanov, N. I.
    Kurskaya, T. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933603.pdf
    Data publikacji:
    1995-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    35.20.My
    31.70.Dk
    Opis:
    A comparative study of the methods of interpretation of solvent influences on electric properties of molecules was conducted based on experimental dielectric properties of dilute solutions of organic substances of various polarity. It was shown that the solvent effect estimated via London-Debye-Keesom pairwise interaction potentials is best accounted for by theories of polarization of condense media which develop the anzatzes of reactive field and local dielectric permittivity.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 3; 419-434
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time-Resolved Microwave Spectroscopy of High Electron Mobility GaAs/AlGaAs Structures
    Autorzy:
    Khachepuridze, A.
    Ivanov, V. Yu.
    Godlewski, M.
    Regiński, K.
    Bugajski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1991552.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    76.40.+b
    76.70.Hb
    Opis:
    Mechanism of the optical detection of cyclotron resonance via emission from 2D electron gas in modulation doped quantum wells and in high electron mobility structures of GaAs/AlGaAs is discussed based on the results of time-resolved optical detection of cyclotron resonance. An important role of impact ionization processes is demonstrated. We also show that microwave radiation destroys emission enhancement at the Fermi level and the relevant mechanism is proposed.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 387-391
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plasma Focus as a lens for intense ion beam focusing
    Autorzy:
    Belan, V. N..
    Butenko, V. I.
    Ivanov, B. I.
    Kiseleva, V. A.
    Kitsenko, A. B.
    Linnik, A. F.
    Maslov, V. I.
    Onishchenko, I. N.
    Prishchepov, V. P.
    Yegorov, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147316.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    intense MeV proton beam accelerator
    plasma focus
    plasma lens
    Opis:
    Experimental investigations were performed to evaluate the focusing properties of the plasma focus for high-energy intense ion beams manipulating. Magnetic probes and optical spectroscopy were used for temporal and spatial plasma geometry investigations. Ion beam portrait was determined at the luminescence screen. In the experiments performed, the focusing coefficient was obtained as the ten times beam compression at the 30 cm length. By variations of the gas volume input, gun voltage, time delay, magnetic field value etc. the dependence of focused ion beam diameter upon various parameters of the plasma focus lens has been investigated. It was revealed that the main focusing effect was caused by the azimuthal magnetic field of the currents carried by the plasma.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 35-36
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    InSb Quantum Dots in an InAsSb Matrix Grown by Molecular Beam Epitaxy
    Autorzy:
    Semenov, A. N.
    Solov'ev, V. A.
    Meltser, B. Ya.
    Lyublinskaya, O. G.
    Terent'ev, Ya. V.
    Sitnikova, A. A.
    Ivanov, S. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044535.pdf
    Data publikacji:
    2005-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    78.67.Hc
    81.07.Ta
    81.15.Hi
    81.16.Dn
    Opis:
    We report on molecular beam epitaxy of InSb insertions in InAs and InAsSb matrices, emitting at wavelengths beyond 4μm. Different growth techniques for deposition of InSb quantum dots in the 1-2 monolayer range of the InSb nominal thickness, namely conventional molecular beam epitaxy and migration enhanced epitaxy, as well as different matrices (InAs and InAsSb) have been employed for increasing the emission wavelength of the InSb/InAs nanostructures. The formation of InSb quantum dots has been studied in situ using reflection high energy electron diffraction and ex situ by using transmission electron microscopy. The peculiarities of In(Ga)AsSb alloys growth and compositional control are also discussed. Bright photoluminescence up to 4.5μm has been observed at 80 K.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 5; 859-865
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of Auger-Type Energy Transfer Processes in Quenching of Anti-Stokes Emission in Chromium and Iron Doped ZnSe: ODMR, Optical and Time-Resolved Study
    Autorzy:
    Ivanov, V. Yu.
    Karczewski, G.
    Godlewski, M.
    Omel'chuk, A. R.
    Belyaev, A. E.
    Zhavoronkov, N. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036871.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    78.55.Et
    76.30.Fc
    Opis:
    Energy up-conversion in chromium and iron doped ZnSe results in the appearance of an anti-Stokes luminescence. The process is efficient in ZnSe:Cr, but not in ZnSe:Fe. We conclude that very efficient three-center Auger processes in ZnSe:Fe quench the anti-Stokes luminescence emission. For chromium doped samples influence of the Auger mechanism is weaker, which we explain by less efficient carrier retrapping by Cr ions. We further discuss possibility of efficient pumping of infrared Cr-related emissions via Cr photoionization transition.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 695-701
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The evaluation of the current state of EHF-sensors quality in the technical systems and its improvement
    Autorzy:
    Chovnyuk, Y. V.
    Ivanov, E. A.
    Dovhaljuk, V. B.
    Shyshyna, M. A.
    Gumenjuk, Y. O.
    Sivak, I. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/114875.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    aperture
    coaxial line
    dynamic range of the evaluation
    extremely high frequency sensors
    function of the entropy evaluation
    scale of the entropy evaluation
    oceny entropii
    czujnik
    funkcja oceny entropii
    Opis:
    In the article the function and the scale for the entropy evaluation of the current state of extremely high frequency (EHF-) sensors quality in the various technical systems which fits the requirements of universality and maximal independency from the human factor are offered. One may see such EHF-sensors for the analysis of the quick transformations of the biological liquids properties. It’s high lighted that the available methods of the determination of technical systems’ quality have essential flaws which consist in both subjectivism because the dominant role in the evaluation belongs to experts and legitimacy of providing them properties of universality which was proved by nobody. The scheme of EHF-sensor is analyzed for which one may create an analytical model. The problem of the fields’ determination at the working region of such sensor is discussed. The presented scheme is possible to use for the mathematical model and just for that part of the problem which is devoted to the transformation of the properties of the object. The results of calculation of components of electromagnetic field at the working space of EHF-sensor are discussed. One may estimate the sizes of this space. The offered function of the quality evaluation, the parameter of which is the quantity of own information of the explored sensor, provides the declared universality approach according to the principles of the information theory. The conformity to all requirements for the functions of the evaluation of the quality: continuity, monotonic and smoothness over the whole range of definition regardless of the probability distribution function, which is measured by the random value EHF-sensor was proved. The proposed scale of the entropy evaluation of the quality fits to standard settings of the diagnostic of the technical systems and has three sub ranges which determine the state of the EHF-sensors: good state, up state, and down state. Unlike the existing psychophysical scales the offered scale has dynamic range of the evaluation so the limits of the sub ranges will automatically change depending on the regulatory and technical requirements for the state of the explored EHF-sensor. Such approach provides adaptation of the scale to specific requirements which gives a chance to evaluate the qualitative state of the object more reliably. The results of modeling of the qualitative state of the sensor are given. The possible practical application of the offered function and scale is usage in the systems of monitoring and diagnostic for determination of the current qualitative state of the explored technical system, as well.
    Źródło:
    Zeszyty Naukowe. Quality. Production. Improvement; 2019, 2 (11); 26-40
    2544-2813
    Pojawia się w:
    Zeszyty Naukowe. Quality. Production. Improvement
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Damage and modification of materials produced by pulsed ion and plasma streams in Dense Plasma Focus device
    Autorzy:
    Pimenov, V. N.
    Demina, E. V.
    Ivanov, L. I.
    Gribkov, V. A.
    Dubrovsky, A. V.
    Ugaste, U.
    Laas, T.
    Scholz, M.
    Miklaszewski, R.
    Kolman, B.
    Tartari, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147722.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    pulse irradiation
    surface damage
    Opis:
    The Dense Plasma Focus (DPF) devices PF-1000, PF-6 and PF-5M working with different gases and in dissimilar irradiation modes were used to carry out experimental investigations of irradiation of a number of materials by powerful pulsed ion and high-temperature plasma streams. The materials under test were designed for application in structural and functional components of thermonuclear fusion devices with magnetic (MPC) and inertial (IPC) plasma confinement, as well as for working chambers of plasma and accelerator devices. The main features of the materials are low-activation and radiation-resistant properties. On the basis of the investigations a significant progress was achieved in understanding of dynamics of high-energy nano- and micro-second pulsed streams in DPF from one side as well as on the mechanisms of their influence upon materials under irradiation from the other one. We demonstrated that this approach can be useful for certain tests of plasma-facing materials (e.g. W for MPC and stainless steels for IPC) and of structural (construction) elements of the above-mentioned devices subjected to pulsed high-energy radiation streams. The results obtained suggest also that DPF devices can be used in new pulse technologies for material treatment by means of powerful nanosecond and microsecond pulses of plasma and ion streams.
    Źródło:
    Nukleonika; 2008, 53, 3; 111-121
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optically Pumped Mid-Infrared Stimulated Emission of ZnSe:Cr Crystals
    Autorzy:
    Ivanov, V. Yu.
    Godlewski, M.
    Szczerbakow, A.
    Omel'chuk, A.
    Davydov, A.
    Zhavoronkov, N.
    Raciukaitis, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038096.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    42.55.Rz
    42.62.Be
    78.55.Et
    Opis:
    We demonstrate that ZnSe:Cr is an excellent solid state laser material for mid-infrared region with a broad amplification band from 2.2 μm to 3 μm, and with a high quantum efficiency of a radiative recombination. 46% external total efficiency and 56 mW threshold power were achieved, when pumped with a CW YAlO:Ho laser at resonant excitation conditions. Such laser system can have widespread applications in medicine as laser scalpels with regulated cutting depth. We further demonstrate a stimulated emission under Cr2+ to 1+ photo-ionization pumping. The latter opens chances for laser emission under carrier injection conditions.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 553-558
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoproduction of organic peroxides on the donor side of photosystem II after destruction of the water-oxidizing complex
    Autorzy:
    Khorobrykh, A.
    Khorobrykh, S.
    Yanykin, D.
    Ivanov, B.
    Klimov, V.
    Mano, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/79884.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    manganese
    photosystem II
    water oxidizing complex
    photooxidation
    organic molecule
    fluorescence probe
    photoinhibition
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dispersion of Al-Si Alloy Structure by Intensive Pulsed Electron Beam
    Autorzy:
    Konovalov, S.
    Gromov, V.
    Zaguliyaev, D.
    Ivanov, Y.
    Semin, A.
    Rubannikova, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381713.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silumin
    structure Al-Si
    electron beam processing
    crystallization cells
    dispersion
    struktura Al-Si
    obróbka wiązką elektronową
    krystalizacja
    dyspersja
    Opis:
    By the method of modern physical material science (optic microscopy scanning and transmission electron microscopy) the analysis of structural phase states, the morphology of the second phase inclusions and defect substructure of Al-Si alloy (silumin) of hypoeutectic composition, subjected to electron beam processing was done with the following parameters: energy density 25-35 J/cm2, beam length 150 μs, pulse number – 3, pulse repetition rate – 0.3 Hz, pressure of residual gas (argon) 0.02 Pa. The surface irradiation results in the melting of the surface layer, the dissolution of boundary inclusions, the stricture formation of high speed cellular crystallization of submicron sizes, the repeated precipitation of the second phase nanodimentional particles. With the increased distance from the irradiation surface the layer containing the second phase inclusions of quasi-equilibrium shape along with the crystallization cells was revealed. It is indicative of the processes of Al-Si alloy structure globalization on electron beam processing.
    Źródło:
    Archives of Foundry Engineering; 2019, 2; 79-84
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure of Zirconia-Based Sol-Gel Glasses Studied by SANS
    Autorzy:
    Ryukhtin, V.
    Strunz, P.
    Kopitsa, G.
    Ezdakova, K.
    Gubanova, N.
    Ivanov, V.
    Baranchikov, A.
    Angelov, B.
    Feoktistov, A.
    Pipich, V.
    Levinský, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402086.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.fg
    81.20.Fw
    81.05.Kf
    61.43.Fs
    Opis:
    Zirconia-based bulk glasses were prepared for the first time by sol-gel method. Such materials are very promising for application as photochromic devices, catalytic systems, chemical sensors, lasers and other nonlinear optics devices. Obtained transparent and semi-transparent materials were studied by small and ultra-small angle neutron scattering (SANS and USANS) methods. As evidenced by SANS, morphology of zirconia glasses is very sensitive to parameters of sol-gel synthesis, e.g. temperature and concentration of reactants. SANS data correlates rather well with surface porosity data. Increasing water concentration in reaction mixtures containing zirconium propylate leads to a significant increase in fractal cluster size, while decrease of the temperature results in an increase of the fractal dimension. The obtained results indicate that parameters of the microstructure and consequently physical properties of zirconia glasses can be effectively controlled by parameters of synthesis.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 582-584
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Photoelectric Properties of ZnSe:Cr and ZnTe:V:Al by Picosecond Four-Wave Mixing Technique
    Autorzy:
    Kadys, A.
    Sudzius, M.
    Jarasiunas, K.
    Ivanov, V.
    Godlewski, M.
    Launay, J.-C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038157.pdf
    Data publikacji:
    2004-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.50.Gr
    81.70.Fy
    61.72.Hh
    61.72.Ji
    Opis:
    Role of deep impurity levels in carrier generation, transport, and recombination were investigated in bulk ZnSe:Cr and ZnTe:V:Al crystals by four-wave mixing technique. The temporal and exposure dependencies of optical nonlinearities in ZnSe:Cr evidenced an influence of Cr1+/Cr2+ states in carrier generation, exhibited very fast carrier relaxation, and revealed the presence of competing recombination mechanisms. Similar investigations in ZnTe:V:Al showed an effective carrier generation from Al-induced defect complexes as well as very fast carrier capture by Zn-vacancies.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 6; 651-657
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanism of Radiative Mn$\text{}^{2+}$ Intra-Shell Recombination in Bulk ZnMnS
    Autorzy:
    Ivanov, V. Yu.
    Godlewski, M.
    Yatsunenko, S.
    Khachapuridze, A.
    Li, M. S.
    Gołacki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027501.pdf
    Data publikacji:
    2001-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    76.30.Fc
    76.70.Hb
    78.55.Et
    Opis:
    Origin of a fast component of the photoluminescence decay of Mn$\text{}^{2+}$ intra-shell $\text{}^{4}$T$\text{}_{1}$ → $\text{}^{6}$A$\text{}_{1}$ transition is discussed based on the results of photoluminescence, photoluminescence kinetics and optically detected magnetic resonance experiments performed for bulk ZnMnS samples with about 1% Mn fraction. It is demonstrated that a fast component of the photoluminescence decay, reported previously for quantum dot structure and related to quantum confinement effects, is also observed in bulk samples and is related by us to very efficient spin cross-relaxation effects.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 3; 351-355
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoluminescence Studies of Cubic Phase GaN Grown by Molecular Beam Epitaxy on (001) Silicon Covered with Sic Layer
    Autorzy:
    Godlewski, M.
    Ivanov, V. Yu.
    Bergman, J. P.
    Monemar, B.
    Barski, A.
    Langer, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968103.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    78.47.+p
    Opis:
    In this work we evaluate optical properties of cubic phase GaN epilayers grown on top of (001) silicon substrate prepared by a new process. Prior to the growth Si substrate was annealed at 1300-1400°C in propane. The so-prepared substrate is covered with a thin (≈ 4 nm) SiC wafer, which allowed a successful growth of good morphological quality cubic phase GaN epilayers. The present results confirm recent suggestion on smaller ionization energies of acceptors in cubic phase GaN epilayers.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 777-780
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of a powerful energy flow effect on materials in PF-1000 installation
    Autorzy:
    Borowiecki, M.
    De Chiara, P.
    Dubrovsky, A. V.
    Dyomina, E. V.
    Gribkov, V. A.
    Ivanov, L. I.
    Maslyaev, S. A.
    Mezzetti, F.
    Miklaszewski, R.
    Pimenov, V. N.
    Pizzo, L.
    Scholz, M.
    Szydlowski, A.
    Ugaste, Y. E.
    Volobuev, I. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/148824.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasma focus (DPF)
    irradiation
    plasma jet
    shock wave
    test specimen
    Opis:
    The report describes some of the results obtained in an experimental study of the impact of a powerful plasma stream and a fast ion beam generated in a PF-1000 device on different materials perspective for the use in radiation loaded parts of pulsed plasma installations. Investigations were done during and after the interaction processes. It is shown that in case of irradiation of samples only by high power flux density plasma streams the effect of detachment still preserved. At the same time a low power flux density high-energy ion beam plays an important role in the process of saturation of the irradiated material by hydrogen.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 117-122
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PF-6 an effective plasma focus as a source of ionizing radiation and plasma streams for application in material technology, biology and medicine
    Autorzy:
    Gribkov, V.
    Dubrovsky, A.
    Scholz, M.
    Jednorog, S.
    Karpiński, L.
    Tomaszewski, K.
    Paduch, M.
    Miklaszewski, R.
    Pimenov, V.
    Ivanov, L. I.
    Dyomina, E. V.
    Maslyaev, S. A.
    Orlova, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147424.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasma focus (DPF)
    ion beam
    plasma beam
    X-ray beams
    surface damage
    microlithography
    radioenzymology
    positron emission tomography (PET)
    Opis:
    A review of results on the design and operation of the new efficient Dense Plasma Focus device PF-6 of medium size (transportable) having bank energy of ca. 7 kJ and possessing a long lifetime is presented. New data on the interaction of the pulsed fast ion beams and dense plasma streams generated at this apparatus with various materials are given. These results are compared with the analogous information received at the biggest facility PF-1000. It is shown that it is possible to have about the same power flux density (in the range of 105 109 W/cm2) in both devices however in different areas. Doses of soft X-rays produced by the device within the resists for the goals of microlithography and micromachining appear to be several times less that it is with the conventional X-ray tube. In biological application of this device, medium- and hard-energy X-rays are exploited in the field of radioenzymology. It was found that the necessary dose producing activation/inactivation of enzymes can be by several orders of magnitude lower if used at a high-power flux density in comparison with those received with isotope sources. In medicine, short-life isotope production for the goals of the positron emission tomography (medicine diagnostics) is possible by means of the fast ions generated within DPF. All these experiments are discussed in the framework of pulsed radiation physics and chemistry in its perfect sense thereto the criteria are formulated.
    Źródło:
    Nukleonika; 2006, 51, 1; 55-62
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface and bulk processes in materials induced by pulsed ion and plasma beams at Dense Plasma Focus devices
    Autorzy:
    Pimenov, V.
    Maslyaev, S.
    Ivanov, L.
    Dyomina, E.
    Gribkov, V.
    Dubrovsky, A.
    Scholz, M.
    Miklaszewski, R.
    Ugaste, U.
    Kolman, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/147498.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    pulse irradiation
    surface damage
    Opis:
    A review of results and new data on the interaction of pulsed ion and dense plasma beams with metals in different Dense Plasma Focus (DPF) devices are presented. Different irradiation conditions with microsecond pulses of the power density in the range of 105 109 W/cm2 were applied. The most interesting thermal and radiation effects observed in both surface and bulk of the material positioned at the cathode part of the DPF device have been considered. Advanced directions of DPF use for scientific and applied problems of radiation material science were determined.
    Źródło:
    Nukleonika; 2006, 51, 1; 71-78
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrospinning of Fibres Using Mixed Compositions Based on Polyetherurethane and Hydrophylic Polymers for the Production of Membrane Materials
    Elektroprzędzenie włókien przy użyciu mieszanych kompozycji na bazie polieterouretanu i polimerów hydrofilowych do produkcji materiałów membranowych
    Autorzy:
    Bokova, Elena S.
    Kovalenko, Grigory M.
    Pawlova, Maria
    Kapustin, Ivan A.
    Evsyukova, Nataliya V.
    Ivanov, Leonid
    Powiązania:
    https://bibliotekanauki.pl/articles/231523.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    fibers electrospinning
    polyurethane
    polymer solutions processing
    solutions modification
    membrane materials
    elektroprzędzenie włókien
    poliuretan
    przetwarzanie roztworów polimerowych
    roztwór modyfikujący
    materiały membranowe
    Opis:
    In this paper, the possibility of obtaining micro- and nanofibres, as well as nonwoven materials from polyether-urethane solutions using the method of electrospinning, was studied. The conditions and formulation-technological factors for the production of nonwoven fibrous webs from polyetherurethane (PUR) solutions modified with hydrophilic polymers: polyvinyl alcohol (PVA) and polyacrylic acid (PAA) were studied. The effect of hydrophilic polymers on the structure and average fibre diameter is shown. An increase in the indicators of hygienic properties of modified nonwoven materials was revealed with the aim of their further use in membrane bags for clothes and shoes.
    W pracy zbadano możliwość otrzymywania mikro- i nanowłókien, a także włóknin z roztworów polieterowo-uretanowych metodą elektroprzędzenia. Badano warunki i czynniki technologiczne niezbędne do produkcji włóknin z roztworów polieterouretanu (PUR) modyfikowanych hydrofilowymi polimerami: polialkoholem winylowym (PVA) i kwasem poliakrylowym (PAA). Zbadano wpływ hydrofilowych polimerów na strukturę i średnią średnicę włókna. Stwierdzono wzrost wskaźników właściwości higienicznych modyfikowanych materiałów włókninowych, co pozwala na zastosowanie wytworzonych materiałów w materiałach membranowych.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2020, 4 (142); 49-51
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoelastic Anomalies and Suppression of Jahn-Teller Distortions in La$\text{}_{1-x}$Sr$\text{}_{x}$MnO$\text{}_{3}$ by Pulsed Magnetic Fields
    Autorzy:
    Kadomtseva, A. M.
    Popov, Yu. F.
    Vorob'ev, G. P.
    Kamilov, K. I.
    Ivanov, V. Yu.
    Mukhin, A. A.
    Balbashov, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013240.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.50.Pp
    Opis:
    Thermal expansion Δl/l(T) and magnetostriction λ$\text{}_{∥, ⊥ }$(H,T) in the pulsed magnetic fields H up to 250 kOe were studied in the single La$\text{}_{1-x}$Sr$\text{}_{x}$MnO$\text{}_{3}$ crystals (x=0.1, 0 .125, and 0.15) at temperatures T=10-320 K. Anomalies in the Δl/l (T) curves were observed near a charge (polaron) ordering (T$\text{}_{p}$) and structural transitions between orthorhombic Jahn-Teller distorted O' phase and high temperature orthorhombic (pseudocubic) O$\text{}^{*}$ one (T'$\text{}_{s}$). A noticeable increase in the field-induced magnetostriction λ$\text{}_{∥, ⊥ }$(H) was revealed in the O' phase at T$\text{}_{p}$
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 599-602
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure, Surface Morphology and Optical Properties of Thin Films of ZnS and CdS Grown by Atomic Layer Epitaxy
    Autorzy:
    Szczerbakow, A.
    Godlewski, M.
    Dynowska, E.
    Ivanov, V. Yu.
    Świątek, K.
    Goldys, E. M.
    Phillips, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992336.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Jk
    68.60.-p
    81.15.Gh
    Opis:
    In this communication we report successful growth of monocrystalline cubic ZnS and monocrystalline and polycrystalline cubic and wurtzite films of CdS by atomic layer epitaxy. Structural and optical properties of these films are analysed. ZnS (and CdS/ZnS) films grown on GaAs substrate are cubic. Atomic layer epitaxy grown films provide several advantages over ZnS and CdS materials grown by other techniques, especially compared to bulk material, which is grown at higher temperatures. First results for ZnS/CdS/ZnS quantum well structures are also discussed.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 579-582
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonradiative Recombination Processes in (CdTe,CdCrTe)/CdMgTe Quantum Well Structures
    Autorzy:
    Godlewski, M.
    Ivanov, V.
    Zakrzewski, A. J.
    Wojtowicz, T.
    Karczewski, G.
    Kossut, J.
    Bergman, J. P.
    Monemar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968108.pdf
    Data publikacji:
    1997-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.60.-p
    76.70.Hb
    Opis:
    Photoluminescence transitions in (CdTe,CdCrTe)/CdMgTe structure grown by molecular beam epitaxy are studied. Photoluminescence investigations show a very strong reduction of the photoluminescence intensity from chromium doped quantum wells. We explain this fact by a very efficient nonradiative recombination in the chromium-doped quantum wells. The present results indicate that the Auger-type energy transfer from excitons to chromium ions is responsible for the photoluminescence deactivation. The efficiency of this process is evaluated.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 4; 781-784
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magneto-Optical Studies of Narrow Band-Gap Heterostructures with Type II Quantum Dots InSb in an InAs Matrix
    Autorzy:
    Mukhin, M.
    Terent'ev, Ya.
    Golub, L.
    Nestoklon, M.
    Meltser, B.
    Semenov, A.
    Solov'ev, V.
    Sitnikova, A.
    Toropov, A.
    Ivanov, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492858.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.75.-c
    71.70.Ej
    78.55.Cr
    78.67.Hc
    78.20.Ls
    75.40.Mg
    Opis:
    Magneto-optical properties of type II heterostructures with InSb/InAs quantum dots has been studied at external magnetic field applied in the Faraday geometry. The emission polarization degree can be changed in the range from 100% σ-minus to 10% σ-plus due to excitation intensity and temperature variation. The detailed calculation of the band structure within a tight-binding approximation is presented. The simulation of the experimental data reveals that the oscillator strength of the optical transitions involving electrons with the spin oriented along and opposite to the magnetic field vector differs by approximately 1.8 times in the heterostructures under study.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 868-869
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the nature of changes in the optical characterization produced in sapphire on its irradiation with a pulsed powerful stream of hydrogen ions
    Autorzy:
    Gribkov, V.
    Ivanov, L.
    Maslyaev, S.
    Pimenov, V.
    Sadowski, M.
    Skladnik-Sadowska, E.
    Banaszak, A.
    Kopeć, G.
    Cheblukov, Y.
    Kozodaev, M. A.
    Suvorov, A. L.
    Smirnov, I. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147991.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    optical characteristics
    irradiation
    fast ion stream
    morphology
    Opis:
    Changes in the optical characteristics in synthetic sapphire specimens produced by microsecond pulse irradiation with a stream of hydrogen ions of energies ranging up to tens keV have been observed. Data on decrease in the optical reflection, measured within the wavelength range of 200 900 nm, are presented. This characterization is compared with the data received by optical and atomic force microscopy as well as by lattice structure analysis performed with X-rays. The measurements indicate that the changes of optical parameters are not a consequence of absorption increase and/or sapphire decomposition. They result from modifications of the morphology and structure of surface layer of the sapphire samples, induced by irradiation.
    Źródło:
    Nukleonika; 2004, 49, 2; 43-49
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of powerful pulses of hydrogen plasma upon materials in PF-1000 device
    Autorzy:
    Pimenov, V.
    Gribkov, V.
    Dubrovsky, A.
    Mezzetti, F.
    Scholz, M.
    Ugaste, U.
    Dyomina, E.
    Ivanov, L.
    Maslyaev, S.
    Miklaszewski, R.
    Borowiecki, M.
    De Chiara, P.
    Pizzo, L.
    Szydlowski, A.
    Volobuev, I. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/147096.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dense plasma focus (DPF)
    ion beam
    irradiation
    plasma jet
    surface damage
    test specimen
    Opis:
    The results of experimental investigations of powerful hydrogen plasma jets and fast ion beams interaction with various materials (austenitic chromium-manganese steels, pure vanadium, tungsten, graphite, copper, and their alloys: Cu-4 mass% Ni and Cu-10 mass% Ga) are presented. The materials were placed on the discharge axis of the PF-1000 device and irradiated with fluxes of fast ions (of energy in the range from tens keV up to several MeV) and with plasma streams (of power flux density q~(108 109) W/cm2). It was found that the fast ions and plasma streams caused different damages to the aforementioned materials. A diverse character of the damages to the individual investigated material was revealed. Some peculiarities of the process as well as the correlation between the surface density of the "macroscopic" structural defects (blisters and craters) and the fluence of the fast ions implanted in the specimen are discussed.
    Źródło:
    Nukleonika; 2002, 47, 4; 155-162
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Luminescence in Highly Excited InGaN/GaN Multiple Quantum Wells Grown on GaN and Sapphire Substrates
    Autorzy:
    Miasojedovas, S.
    Juršėnas, S.
    Kurilčik, G.
    Žukauskas, A.
    Ivanov, V. Yu.
    Godlewski, M.
    Leszczyński, M.
    Perlin, P.
    Suski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038288.pdf
    Data publikacji:
    2004-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.45.+h
    78.47.+p
    78.67.De
    Opis:
    We report on high-excitation luminescence spectroscopy in In$\text{}_{x}$Ga$\text{}_{1-x}$N/GaN multiple quantum wells grown by MOCVD over sapphire and bulk GaN substrates. High excitation conditions enabled us to achieve a screening of the built-in field by free carriers. This allowed for the evaluation of the influence of band potential fluctuations due to the variation in In-content on efficiency of spontaneous and stimulated emission. InGaN/GaN multiple quantum wells grown on bulk GaN substrate exhibit a significantly lower stimulated emission threshold and thus enhanced lateral emission. Transient and dynamic properties of luminescence indicate a significant reduction in compositional disorder in homoepitaxially grown structures
    Źródło:
    Acta Physica Polonica A; 2004, 106, 2; 273-279
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    AlGaN Quantum Well Heterostructures for Mid-Ultraviolet Emitters with Improved Room Temperature Quantum Efficiency
    Autorzy:
    Shevchenko, E.
    Toropov, A.
    Nechaev, D.
    Jmerik, V.
    Shubina, T.
    Ivanov, S.
    Yagovkina, M.
    Pozina, G.
    Bergman, J.
    Monemar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1376069.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.De
    78.55.Cr
    71.35.-y
    78.66.-w
    Opis:
    We report on optical studies of exciton localization and recombination kinetics in two single 2.2 nm thick $Al_{x}Ga_{1-x}N$/$Al_{x+0.1}Ga_{0.9-x}N$ quantum well structures (x=0.55 and 0.6) grown by plasma assisted molecular beam epitaxy on a c-sapphire substrate. Strong localization potential inherent for both the quantum well and barrier regions results in merging of the quantum well and barrier emission spectra into a single broad line centered at 285 nm (x=0.55) and 275 nm (x=0.6). Time-resolved photoluminescence measurements revealed surprising temperature stability of the photoluminescence decay time constant ( ≈ 400 ps) relevant to the recombination of the quantum well localized excitons. This observation implies nearly constant quantum efficiency of the quantum well emission in the whole range from 4.6 to 300 K.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1140-1142
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Origin of Ultrafast Component of Photoluminescence Decay in Nanostructures Doped with Transition Metal or Rare-Earth Ions
    Autorzy:
    Godlewski, M.
    Yatsunenko, S.
    Ivanov, V. Yu.
    Khachapuridze, A.
    Świątek, K.
    Goldys, E. M.
    Phillips, M. R.
    Klar, P. J.
    Heimbrodt, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041630.pdf
    Data publikacji:
    2005-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    76.30.Fc
    76.70.Hb
    78.55.Et
    Opis:
    Bulk samples, layers, quantum well, and quantum dot structures of II-Mn-VI samples all show coexistence of slow and fast components of Mn$\text{}^{2+}$ photoluminescence decay. Thus, fast photoluminescence decay cannot be related to low dimensionality of a host material. This also means that the model of the so-called quantum confined atom is incorrect. Based on the results of time-resolved photoluminescence and optically detected magnetic resonance investigations we relate the observed lifetime decrease in Mn$\text{}^{2+}$ intra-shell transition to spin dependent magnetic interactions between localized spins of Mn$\text{}^{2+}$ ions and between Mn$\text{}^{2+}$ ions and spins/magnetic moments of free carriers. The latter mechanism is enhanced in nanostructures.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 1; 65-74
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stimulated Emission from the MBE Grown Homoepitaxial InGaN Based Multiple Quantum Wells Structures
    Autorzy:
    Ivanov, V.
    Godlewski, M.
    Miasojedovas, S.
    Juršėnas, S.
    Kazlauskas, K.
    Žukauskas, A.
    Skierbiszewski, C.
    Siekacz, M.
    Leszczyński, M.
    Perlin, P.
    Suski, T.
    Grzegory, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1179597.pdf
    Data publikacji:
    2005-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    73.21.Fg
    72.20.Jv
    78.47.+p
    Opis:
    We report on photoluminescence characterization of InGaN based laser structures grown by homoepitaxial radio frequency plasma-assisted molecular beam epitaxy. Owing to Si doped barriers, the structures show a negligible impact of the built-in electric field, which was proved by excitation intensity dependent and quantum well width dependent luminescence experiments. Relatively low variation in band potential due to inhomogeneous distribution of In was quantitatively estimated from the photoluminescence temperature behavior using Monte Carlo simulation of in-plane carrier hopping and optically detected cyclotron resonance experiments. Efficient stimulated emission with a low threshold for optically pumped laser structures was observed.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 2; 225-229
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave-Induced Delocalization of Excitons in Ternary Compounds of II-VI and III-V Semiconductors
    Autorzy:
    Ivanov, V. Yu.
    Godlewski, M.
    Khachapuridze, A.
    Yatsunenko, S.
    Wojtowicz, T.
    Karczewski, G.
    Bergman, J. P.
    Monemar, B.
    Shamirzaev, T.
    Zhuravlev, K.
    Leonardi, K.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035757.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Ji
    72.25.Rb
    76.70.Hb
    78.55.Et
    Opis:
    In this work we employ technique of optically detected cyclotron resonance for evaluation of the role of localization processes in CdTe/CdMnTe and CdMnTe/CdMgTe quantum well structures. From microwave-induced changes of excitonic emissions we evaluate magnitude of potential fluctuations (Stokes shift), correlate optically detected cyclotron resonance results with the results of time-resolved experiments and discuss nature of recombination processes in the limit of a strong localization.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 559-566
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Do We Understand Magnetic Properties of ZnMnO?
    Autorzy:
    Godlewski, M.
    Wójcik, A.
    Kopalko, K.
    Ivanov, V. Yu.
    Wilamowski, Z.
    Jakieła, R.
    Guziewicz, E.
    Szczepanik, A.
    Dłużewski, P.
    Chikoidze, E.
    Barjon, J.
    Dumont, Y.
    Putkonen, M.
    Niinistö, L.
    Tang, Dong
    Powiązania:
    https://bibliotekanauki.pl/articles/2047644.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Gh
    75.75.+a
    78.30.Fs
    78.60.Hk
    Opis:
    Optical and magnetic properties of ZnMnO films are discussed based on the results of cathodoluminescence, photoluminescence, and magneto-photoluminescence investigations. We show that photoluminescence/cathodoluminescence emissions are strongly quenched and become in-plane inhomogeneous in samples with increased Mn fractions. Strong polarization of photoluminescence is observed, even though excitonic lines do not shift and are not split at magnetic fields up to 6 T.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 261-267
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spin Dependent Interactions of Free Carriers and Manganese Ions in Nanostructures of Wide Band Gap II-Mn-VI Semiconductors - Mechanism of Lifetime Reduction
    Autorzy:
    Yatsunenko, S.
    Khachapuridze, A.
    Ivanov, V. Yu.
    Godlewski, M.
    Khoi, Le Van
    Gołacki, Z.
    Karczewski, G.
    Goldys, E. M.
    Phillips, M.
    Klar, P. J.
    Heimbrodt, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2036034.pdf
    Data publikacji:
    2003-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    76.30.Fc
    76.70.Hb
    78.55.Et
    Opis:
    Based on the results of optically detected magnetic resonance and time-resolved investigations we relate the observed lifetime shortening of intra-shell Mn$\text{}^{2+}$ emission to spin dependent magnetic interactions between localized spins of Mn$\text{}^{2+}$ ions and spins/magnetic moments of free carriers. We show that this mechanism is active in both bulk and in low dimensional structures, such as quantum wells, quantum dots, and nanostructures.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 6; 643-648
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-64 z 64

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