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    Tytuł:
    Comparison Between the Strain Indicator HRV of a Head-Based Virtual Retinal Display and LC-Head Mounted Displays for Augmented Reality
    Autorzy:
    Oehme, O.
    Schmidt, L.
    Luczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/90667.pdf
    Data publikacji:
    2003
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    virtual retinal display
    heart rate variability
    workload
    strain
    augmented reality
    stres
    komputer
    obciążenie pracą umysłową
    zagrożenia zdrowia
    praca przy komputerze
    Opis:
    Augmented Reality uses Head Mounted Displays (HMD) to overlay the real word with additional virtual information. Virtual Retinal Displays (VRD), a new display technology, no longer requires Liquid Crystal Displays (LCD). VRD technology addresses the retina directly with a single laser stream of pixels. There are no studies on the user’s informational strain in this new VRD technology. Various papers have shown that Heart Rate Variability (HRV) is a valid indicator for the user’s informational strain. An empirical test revealed no difference in the user’s HRV between VRD technology and LCD technology. Consequently, there seems to be a comparable user informational strain regarding the display types.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2003, 9, 4; 419-430
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insights into the Phylogeny of the Genus Stentor (Heterotrichea, Ciliophora) with Special Emphasis on the Evolution of the Macronucleus Based on SSU rDNA Data
    Autorzy:
    Thamm, Markus
    Schmidt, Stephanie L.
    Bernhard, Detlef
    Powiązania:
    https://bibliotekanauki.pl/articles/763792.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
    Tematy:
    Heterotrichea, Stentor, macronuclear evolution, phylogeny
    Opis:
    Representatives of the genus Stentor (Stentoridae, Heterotrichea) are striking ciliates in environmentalwater samples because of their size (up to 4 mm) and their trumpet-like shape. Important for species identification are the following main characteristics: (1) the presence or absence of endosymbiotic algae (zoochlorellae); (2) the colour of the pigmented cortical granules, and (3) the shape of the macronucleus. The complete small subunit rDNA (SSU rDNA) of 19 further representatives of the genus Stentor was sequenced to examine the phylogenetic relationships within this genus and to determine the taxonomic value of these main characteristics. The detailed phylogenetic analyses yielded a separation of all species possessing a single compact macronucleus from those species with an “elongated” macronucleus (moniliform or vermiform). The data also indicate that the uptake of algae as well as the loss of pigmentation happened independently in different lineages. Furthermore, a high level of intraspecific variation within several species was found. Thus, S. muelleri and S. (sp.) cf. katashimai appear to represent distinct species and S. multiformis is composed of a species complex.
    Źródło:
    Acta Protozoologica; 2010, 49, 3
    1689-0027
    Pojawia się w:
    Acta Protozoologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Weryfikacja możliwości bezpiecznej ewakuacji z tunelu drogowego w warunkach pożaru
    Verification of Possible Safe Evacuation From Road Tunnels in the Event of Fire
    Autorzy:
    Nowak, Ł.
    Schmidt-Polończyk, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/373252.pdf
    Data publikacji:
    2017
    Wydawca:
    Centrum Naukowo-Badawcze Ochrony Przeciwpożarowej im. Józefa Tuliszkowskiego
    Tematy:
    ewakuacja
    wyjścia ewakuacyjne
    bezpieczeństwo pożarowe
    tunel Mont Blanc
    evacuation
    evacuation exits
    fire safety
    Mont Blanc tunnel
    Opis:
    Cel: Celem artykułu jest przedstawienie rezultatów badań numerycznych ewakuacji z tunelu drogowego w warunkach pożaru dla trzech różnych scenariuszy pożarowych, których bazę stanowiła katastrofa w tunelu drogowym Mont Blanc z 1999 roku. W oparciu o nią wykonano trzy modele tunelu: − model odpowiadający rzeczywistym warunkom panującym w tunelu w czasie pożaru w 1999 roku, − model odnoszący się do warunków po wprowadzeniu zmian związanych z przebudową tunelu i jego ponownym otwarciem w 2002 roku oraz, − model odnoszący się do obowiązujących w UE wymogów Dyrektywy 2004/54/WE Parlamentu Europejskiego i Rady. Wprowadzenie: Artykuł poświęcono w głównej mierze wpływowi rozmieszczenia schronów oraz wyjść ewakuacyjnych w tunelu drogowym na rezultaty działań samoratowniczych w chwili wystąpienia zagrożenia pożarowego. Tunel drogowy jest przestrzenią ograniczoną, w której pożar prowadzi do szybkiej zmiany parametrów otoczenia i powstania warunków krytycznych mogących stanowić zagrożenie dla jego użytkowników. W związku z powyższym gęstość rozmieszczenia dróg ewakuacyjnych w tego typu przestrzeniach ma bardzo istotny wpływ na czas działań samoratowniczych. Metodologia: W artykule przeprowadzono badania modelowania numerycznego, które pozwoliły wyznaczyć wymagany czas bezpiecznej ewakuacji TREST. Dostępny czas ewakuacji TASET został wyznaczony w oparciu o analizę pożaru w tunelu Mont Blanc z 1999 roku. Ewakuację uznano za bezpieczną, gdy spełnione zostało tzw. kryterium bezpiecznej ewakuacji, czyli zależność TASET ≥ TREST. Wnioski: Wyniki obliczeń numerycznych potwierdziły, że wprowadzone po pożarze zmiany w tunelu Mont Blanc mogłyby zapewnić bezpieczeństwo użytkownikom tunelu w razie wystąpienia w nim pożaru podobnego do tego z 1999 roku. Ponadto w przypadku dwóch pozostałych scenariuszy pożarowych – czyli dla rozmieszczenia schronów co 300 metrów oraz wyjść ewakuacyjnych do równoległego tunelu ewakuacyjnego usytuowanych co 500 metrów – wykazano brak możliwości przeprowadzenia skutecznych działań samoratowniczych. Czas ewakuacji w dużej mierze zależy od czasu przejścia drogą ewakuacyjną, dlatego gęstość wyjść ewakuacyjnych oraz schronów powinna być ustalana na etapie projektowym z uwzględnieniem najbardziej krytycznego scenariusza. Dzięki temu w chwili wystąpienia niebezpiecznej sytuacji w przestrzeni tunelu każdy jego użytkownik będzie miał warunki do bezpiecznej ewakuacji.
    Aim: The main purpose of this article is to present the results of numerical calculations of evacuation from the road tunnel in the case of fire in three different scenarios. The research is based on the Mont Blanc tunnel catastrophe in 1999. Three tunnel models were generated on this basis: − a model corresponding to the actual conditions in the tunnel during the 1999 fire, − a model reflecting conditions after modifications associated with the tunnel’s redevelopment and its reopening in 2002, − a model referring to the the requirements of Directive 2004/54/EC of the European Parliament and of the Council binding in the EU. Introduction: In the article, the authors focused on the influence of the distance between shelters or evacuation exits in a road tunnel on the results of self-rescue actions in the event of fire. Tunnels have limited space, so a fire leads to rapid changes in the environment’s parameters and the occurrence of critical conditions, which can be dangerous for human life. Therefore, the distribution of evacuation exits influences the duration of self-rescue actions. Methodology: Numerical calculations were conducted for the purpose of defining the Required Safe Escape Time TREST. The Available Safe Escape Time TASET was determined on the basis of the analysis of the fire in the Mont Blanc tunnel in 1999. The evacuation process is considered safe when the so-called safe escape time criterion is met, i.e. when dependency TASET ≥ TREST is met. Conclusions: The results of the numerical calculation confirmed that the modifications after the Mont Blanc fire could ensure safe evacuation in the event of a fire similar to that of 1999. Moreover, in the case of the two remaining fire scenarios (the distance between shelters is 300 m and the distance between evacuation exits to the parallel evacuation tunnel is 500 m), there is no possibility to conduct safe self-rescue actions. Evacuation time largely depends on the movement speed of evacuees, thus the distribution of evacuation exits or shelters should be determined during the design phase taking into consideration the most dangerous scenario, so that each tunnel user would have proper conditions for safe evacuation.
    Źródło:
    Bezpieczeństwo i Technika Pożarnicza; 2017, 47, 3; 96-110
    1895-8443
    Pojawia się w:
    Bezpieczeństwo i Technika Pożarnicza
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defect Levels in Gallium Arsenide after Irradiation with Light Ions
    Autorzy:
    Schmidt, T.
    Palmetshofer, L.
    Lübke, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1877086.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Ln
    Opis:
    Deep level centers in GaAs implanted with light ions (H$\text{}^{+}$, He$\text{}^{+}$) were studied by means of deep level transient spectroscopy, double correlation deep level transient spectroscopy and capacity voltage carrier profiling directly after the implantation process and after annealing at various temperatures. Five different electron traps with energy positions between 0.13-0.75 eV are detected. From the evaluated defect production and carrier trapping yields and their annealing behavior we conclude that each of these traps efficiently contributes to the trapping of free carriers. The EL2 defect is created in too low concentrations in order to significantly account for the removal of free carriers.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 543-546
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time variable gain for long range sonar with chirp sounding signal
    Autorzy:
    Marszal, J.
    Ostrowski, Z.
    Schmidt, J.
    Kilian, L.
    Jedel, A.
    Schmidt, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332524.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The main purpose of applying Time Variable Gain (TVG) in active sonars with digital signal processing is to reduce dynamic range of echo signal and adapt it to the dynamic range of the analogue to digital conversion. With high transmission losses level, the dynamic range of the input signal in long range sonars can be very high and even exceed 200 dB. When chirp sounding signals with matched filtration are used, sonars can reach very long ranges. The article presents optimisation of TVG control for long range sonars. It also looks at the influence of chirp sounding signal compression, the result of digital matched filtration, for the TVG controlling. The examples of obtained results are presented.
    Źródło:
    Hydroacoustics; 2007, 10; 117-122
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustical estimation of fish distribution and abundance in two Spitsbergen fjords
    Autorzy:
    Szczucka, J.
    Hoppe, L.
    Schmidt, B.
    Fey, D.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/47822.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Arctic region
    fish
    cod
    Gadus morhua
    Norway haddock
    Melanogrammus aeglefinus
    fish distribution
    fish abundance
    acoustics
    climate change
    global warming
    Spitsbergen fjord
    Opis:
    Over recent decades, the Arctic region has been subjected to rapid climate change stemming from global warming. The advance of Atlantic waters to high latitudes is notable. The increased abundance of fish, such as cod (Gadus morhua) and haddock (Melanogrammus aeglefinus), has been reported near the western coast of Spitsbergen and entering fjords together with Atlantic waters. This study used multifrequency acoustics to measure fish distribution and abundance in 2013–2014 in two Arctic fjords, the colder Hornsund, which is typically of Arctic character, and the warmer Kongsfjorden, which is more of Atlantic character. The study revealed a bimodal fish size distribution with larger fish in the deep parts of fjords, and smaller fish distributed in more shallow waters. An evident increase in the abundance of large fish, most probably Atlantic cod, was observed in Hornsund and especially in Kongsfjorden in 2014 in comparison to 2013. The intense inflow of Atlantic water on the shelf in 2014 is suggested as the explanation for this phenomenon.
    Źródło:
    Oceanologia; 2017, 59, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Upper Sinemurian ammonite succession in the Sierra Madre Oriental (Mexico)
    Autorzy:
    Meister, Ch.
    Blau, J.
    Dommergues, J-L.
    Schlatter, R.
    Schmidt-Effing, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061407.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    ammonites
    Early Jurassic
    Sinemurian
    biostratigraphy
    Mexico
    Sierra Madre Oriental
    Opis:
    In the Sierra Madre Oriental (Mexico), the biostratigraphic subdivision of the Upper Sinemurian can be refined. It has been possible to differentiate 11 horizons from the upper Obtusum Zone to the top of the Raricostatum Zone which are correlated with the NW European standard zonation. The index species of each horizon is figured.
    Źródło:
    Volumina Jurassica; 2009, 7, 1; 31-36
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Workstation for training ASW helicopter navigators and analysing real flight data
    Autorzy:
    Raganowicz, A.
    Kilian, L.
    Marszal, J.
    Schmidt, A.
    Sidorko, T.
    Rudnicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/332784.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    helicopter navigators
    real flight data
    aviation
    Opis:
    The article presents a training and diagnostic workstation designed for Polish Navy ASW helicopter navigators. Installed at the helicopter base, the workstation is used for training and instruction in operating the device and analysing information gathered by navigators during the flight using the ASW onboard sonar, sonobuoy receiver and magnetometer. The workstation allows instructors to task two operators and monitor their performance under conditions resembling those onboard a plane. The tasks involve the operation of the consoles and collecting information during tactical situations, diagnosing damage and analysing flight data in office environment. The objective is to ensure proper helicopter navigator training and experience given the limited possibility of training flights.
    Źródło:
    Hydroacoustics; 2009, 12; 181-188
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analytical expression for the D.I.P.–P.I.P. flexion interdependence in human fingers
    Autorzy:
    Van-Zwieten, K. J.
    Schmidt, K. P.
    Bex, G. J.
    Lippens, P. L.
    Duyvendak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/306688.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    model
    palec
    kinematyka
    koordynacja
    finger
    kinematical
    interphalangeal
    flexion
    coordination
    Opis:
    Empirical evidence shows that a strong correlation exists between the flexion angles of the distal and proximal interphalangeal (D.I.P., P.I.P.) joints of the human finger. Several authors measured this functional dependence, stating that the interdependence of D.I.P. and P.I.P. flexion is different for healthy individuals and patients displaying pathologies. The purpose of our study is to find an analytical expression for this correlation. Methods: Following closely the anatomical in situ relations, we developed a two-dimensional kinematical model which expresses analytically the D.I.P.–P.I.P. angle correlation. Numerical values for the model were extracted from one healthy and one pathological case data set. Results: The analytical form of the model allows for any P.I.P. angle not only to calculate the corresponding D.I.P. angle, but after first order differentiation with respect to the P.I.P. angle, it also shows the rate of change of the D.I.P. flexion. The model reproduces well the differences in the angular correlation of D.I.P. flexion of the two healthy-pathological data sets. Displaying the rate of change of D.I.P. flexion versus P.I.P. flexion provides an additional, clear-cut discriminatory tool between normal and pathological states. Conclusions: Information on differences between normal and pathological flexion of fingers is more pronounced and easier accessible from the derivatives of the D.I.P.–P.I.P. flexion behaviour than from direct angular correlation data. The analytical form of our model allows one to establish the rate of change of the D.I.P. angles, resulting in a better analysis of the situations at hand.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 1; 129-135
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of nanostructured bulk cobalt triantimonide doped with tellurium and indium prepared by pulsed plasma in liquid method
    Autorzy:
    Zybała, R.
    Schmidt, M.
    Kaszyca, K.
    Chmielewski, M.
    Kruszewski, M. J.
    Jasiński, M.
    Rajska, M.
    Ciupiński, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/200831.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermoelectric materials
    nanostructured materials
    skutterudite
    energy harvesting
    spark plasma sintering
    Opis:
    One of the ways to decrease thermal conductivity is nano structurization. Cobalt triantimonide (CoSb3) samples with added indium or tellurium were prepared by the direct fusion technique from high purity elements. Ingots were pulverized and re-compacted to form electrodes. Then, the pulsed plasma in liquid (PPL) method was applied. All materials were consolidated using rapid spark plasma sintering (SPS). For the analysis, methods such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) with a laser flash apparatus (LFA) were used. For density measurement, the Archimedes’ method was used. Electrical conductivity was measured using a standard four-wire method. The Seebeck coefficient was calculated to form measured Seebeck voltage in the sample placed in a temperature gradient. The preparation method allowed for obtaining CoSb3 nanomaterial with significantly lower thermal conductivity (10 Wm–1K–1 for pure CoSb3 and 3 Wm–1K–1 for the nanostructured sample in room temperature (RT)). The size of crystallites (from SEM observations) in the powders prepared was about 20 nm, joined into larger agglomerates. The Seebeck coefficient, α, was about –200μVK–1 in the case of both dopants, In and Te, in microsized material and about −400 μK−1 for the nanomaterial at RT. For pure CoSb3 , α was about 150 μVK−1 and it stood at −50 μVK−1 for nanomaterial at RT. In bulk nanomaterial samples, due to a decrease in electrical conductivity and inversion of the Seebeck coefficient, there was no increase in ZT values and the ZT for the nanosized material was below 0.02 in the measured temperature range, while for microsized In-doped sample it reached maximum ZT = 0.7 in (600K).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 1; 125-134
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of the Intraband Light Absorption in Selectively Doped GaAs/AlGaAs Quantum Wells
    Autorzy:
    Vorobjev, L.
    Panevin, V.
    Fedosov, N.
    Firsov, D.
    Shalygin, V.
    Seilmeier, A.
    Schmidt, S.
    Zibik, E.
    Towe, E.
    Kapaev, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1178288.pdf
    Data publikacji:
    2005-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.55.Px
    42.60.-v
    Opis:
    Spectral and temperature dependences of equilibrium and non-equi-intersubband light absorption in the mid-infrared spectral range were studied in selectively doped asymmetrical tunnel-coupled GaAs/AlGaAs quantum wells. The temporal evolution of the absorption studied by means of a picosecond pump-probe technique was found to have a biexponential character. The fast decay times are determined by intersubband electron relaxation due to electron scattering by optical phonons and impurities. The presence of long decay times in transient mid-infrared absorption is probably connected with electron transitions from the states in barrier (X and L valleys as well as deep centers) to the states of the quantum well. Experimentally determined intersubband scattering times are compared with the calculated ones.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 2; 429-434
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strong Electric Field Driven Carrier Transport Non-Linearities in n-Type GaAs/AlGaAs Superlattices
    Autorzy:
    Subačius, L.
    Venckevičius, R.
    Kašalynas, I.
    Seliuta, D.
    Valušis, G.
    Schmidt, J.
    Lisauskas, A.
    Roskos, H.
    Alekseev, K.
    Köhler, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505524.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.65.Cd
    06.60.Jn
    73.90.+f
    Opis:
    Nanosecond pulsed technique was used to study and discriminate strong electric field induced effects in carrier transport in silicon doped GaAs/$Al_{0.3}Ga_{0.7}As$ superlattices at room temperature. The experiment shows that the superlattice can serve as gain media to employ parametric phenomena for microwave amplification.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 167-169
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modernization of ASW sonar SQS-56 at Gdansk University of Technology
    Autorzy:
    Marszal, J.
    Schmidt, J.
    Salamon, R.
    Kilian, L.
    Raganowicz, A.
    Zachariasz, K.
    Ostrowski, Z.
    Jedel, A.
    Rudnicki, M.
    Sidorko, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/331991.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The fast development of electronic technology and digital signal processing methods makes electronic devices, including sonar systems ones, obsolete very quickly. On the other hand the ships mechanical components including mechanical parts of sonars are operational for a few dozens of years. It makes good opportunity to modernize these devices by using modern electronic devices and new digital signal processing methods with application of existing antenna and mechanical systems. The paper presents the modernization of ASW sonar SQS-56 on the Polish frigate ORP “Kościusko”. The aim of modernization, the new parameters of the sonar and block diagram after modernization are presented.
    Źródło:
    Hydroacoustics; 2010, 13; 191-196
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of Antimony Telluride for Thermoelectric and Optoelectronic Applications
    Autorzy:
    Zybała, R.
    Mars, K.
    Mikuła, A.
    Bogusławski, J.
    Soboń, G.
    Sotor, J.
    Schmidt, M.
    Kaszyca, K.
    Chmielewski, M.
    Ciupiński, L.
    Pietrzak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/352428.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    antimony telluride
    thermoelectric materials
    thin films
    PVD magnetron sputtering
    topological insulator
    Opis:
    Antimony telluride (Sb2 Te3 ) is an intermetallic compound crystallizing in a hexagonal lattice with R-3m space group. It creates a c lose packed structure of an ABCABC type. As intrinsic semiconductor characterized by excellent electrical properties, Sb2 Te3 is widely used as a low-temperature thermoelectric material. At the same time, due to unusual properties (strictly connected with the structure), antimony telluride exhibits nonlinear optical properties, including saturable absorption. Nanostructurization, elemental doping and possibilities of synthesis Sb2 Te3 in various forms (polycrystalline, single crystal or thin film) are the most promising methods for improving thermoelectric properties of Sb2Te3.Applications of Sb2 Te3 in optical devices (e.g. nonlinear modulator, in particular saturable absorbers for ultrafast lasers) are also interesting. The antimony telluride in form of bulk polycrystals and layers for thermoelectric and optoelectronic applications respectively were used. For optical applications thin layers of the material were formed and studied. Synthesis and structural characterization of Sb2 Te3 were also presented here. The anisotropy (packed structure) and its influence on thermoelectric properties have been performed. Furthermore, preparation and characterization of Sb2 Te3 thin films for optical uses have been also made.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1067-1070
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanostructural Superconducting Materials for Fault Current Limiters and Cryogenic Electrical Machines
    Autorzy:
    Prikhna, T.
    Gawalek, W.
    Savchuk, Ya.
    Sergienko, N.
    Moshchil, V.
    Sokolovsky, V.
    Vajda, J.
    Tkach, V.
    Karau, F.
    Weber, H.
    Eisterer, M.
    Joulain, A.
    Rabier, J.
    Chaud, X.
    Wendt, M.
    Dellith, J.
    Danilenko, N.
    Habisreuther, T.
    Dub, S.
    Meerovich, V.
    Litzkendorf, D.
    Nagorny, P.
    Kovalev, L.
    Schmidt, Ch.
    Melnikov, V.
    Shapovalov, A.
    Kozyrev, A.
    Sverdun, V.
    Kosa, J.
    Vlasenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1549637.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Sv
    74.81.Bd
    74.70.Ad
    74.78.Na
    74.62.Fj
    74.25.Ld
    74.62.Dh
    74.25.Ha
    Opis:
    Materials of the Y-Ba-Cu-O (melt-textured $YBa_{2}Cu_{3}O_{7-δ}$-based materials or MT-YBCO) and Mg-B-O ($MgB_{2}$-based materials) systems with high superconducting performance, which can be attained due to the formation of regularly distributed nanostructural defects and inhomogeneities in their structure can be effectively used in cryogenic technique, in particular in fault current limiters and electrical machines (electromotors, generators, pumps for liquid gases, etc.). The developed processes of high-temperature (900-800°C) oxygenation under elevated pressure (16 MPa) of MT-YBCO and high-pressure (2 GPa) synthesis of $MgB_{2}$-based materials allowed us to attain high superconductive (critical current densities, upper critical fields, fields of irreversibility, trapped magnetic fields) and mechanical (hardness, fracture toughness, Young modulus) characteristics. It has been shown that the effect of materials properties improvement in the case of MT-YBCO was attained due to the formation of high twin density (20-22 $μm^{-1}$), prevention of macrocracking and reduction (by a factor of 4.5) of microcrack density, and in the case of $MgB_{2}$-based materials due to the formation of oxygen-enriched as compared to the matrix phase fine-dispersed Mg-B-O inhomogeneities as well as inclusions of higher borides with near-$MgB_{12}$ stoichiometry in the Mg-B-O matrix (with 15-37 nm average grain sizes). The possibility is shown to obtain the rather high $T_{c}$ (37 K) and critical current densities in materials with $MgB_{12}$ matrix (with 95% of shielding fraction as calculated from the resistant curve).
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 7-14
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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