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    Wyświetlanie 1-12 z 12
    Tytuł:
    The degradation problems in HTc Bi:2223 superconducting tapes
    Problemy degradacji w taśmach nadprzewodnikowych
    Autorzy:
    Gajda, D.
    Sosnowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/158957.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
    Tematy:
    nadprzewodnictwo
    taśma nadprzewodnikowa
    efekt degradacji
    taśmy HTc Bi:2223
    superconductivity
    superconducting tapes
    degradation effects
    HTc Bi:2223 tapes
    Opis:
    Continuous progress in the superconducting wires technology is dependent on the critical current enhancement of the high temperature oxide superconductors. The superconducting wires are however strongly influenced by the degradation effects. The present paper describes performed experimental investigations, of the degradation processes influence on the critical current of the BiSrCaCuO/Ag high temperature superconducting tapes.
    Postęp w technologii przewodów z nadprzewodników wysokotemperaturowych zależy od dalszego podwyższenia wartości prądu krytycznego i osiągnięcia jego stabilności. Przewody nadprzewodnikowe podlegają efektom degradacji. W artykule opisano wykonane badania doświadczalne wpływu procesu degradacji na prąd krytyczny taśmy z nadprzewodnika wysokotemperaturowego BiSrCaCuO/Ag.
    Źródło:
    Prace Instytutu Elektrotechniki; 2007, 232; 5-14
    0032-6216
    Pojawia się w:
    Prace Instytutu Elektrotechniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dangerous drivers behavior in road traffic - reasons, results, prevention
    Autorzy:
    Bąk, J.
    Bąk-Gajda, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/246215.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    drivers
    aggression
    psychological tests
    Opis:
    Driving a car is a task demanding particular competencies, which include: knowledge, skills and specific personality and mental traits. Every driver should posses: knowledge about traffic law regulations, practical skills of driving a vehicle, ability to predict traffic situations and, what is especially important, self-diagnosis ability. Those skills determine driving safety. Paper presents dangerous and aggressive driving behaviour on the roads. It describes characteristic features of drivers and type of offenses committed by them, as well as recognition of the scale and reasons for aggression in the road traffic. Paper includes detailed research results analyses of aggressive behaviour and its evaluation by road traffic controllers - police (408 persons), and by drivers participating in the demerit points reduction scheme (504 persons). Survey results indicate that drivers consciously break traffic law, underestimate danger, overestimate their own abilities, feel unpunished and they don't know traffic regulations well. All results shows that aggression is a frequent problem, especially concerning 18-39 year old group with wrong attitudes towards others road users. Importance of psychological testing of drivers, necessity of psycho-educational and preventive actions was pointed out in view of these circumstances. Research has allowed determining psychological reasons of the drivers' attitude and behaviour. Conclusions suggest undertaking activities and campaigns whose purpose is to change dangerous attitudes and habits and create re-education systems for the drivers who regularly break road traffic regulations.
    Źródło:
    Journal of KONES; 2008, 15, 2; 15-20
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Ex Situ $MgB_2$ Barrier and HIP on the $I_c$ Anisotropy in Double Core $MgB_2//Cu$ Wires
    Autorzy:
    Gajda, D.
    Morawski, A.
    Zaleski, A.
    Cetner, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535516.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Opis:
    The effect of large $I_{c}$ anisotropy reductions in $MgB_2//Cu$ sheathed wire is presented. The measurements of the critical current in rising magnetic field up to 14 T at 4.2 K were performed. Due to the application of the high isostatic pressure process to the copper sheathed $MgB_2$ wires with the ex situ $MgB_2$ homo barrier around the in situ core the anisotropy for such wires was very small and approached to less than 2% at magnetic field over 4 T. The presented geometry and technology show several advantages in their practical applications.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1059-1061
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Nano-SiC Doping on the Superconducting Critical Parameters in $MgB_2$/Fe Wires and Tapes
    Autorzy:
    Gajda, D.
    Zaleski, A.
    Morawski, A.
    Kario, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813696.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Ad
    74.25.Sv
    Opis:
    In this paper the results of critical current measurements for $MgB_2$ wires and tapes in iron sheath with and without nano-SiC doping are presented. We focus on power-in-tube processing technique, using both in situ and ex situ methods. In situ $MgB_2$ wires and tapes were fabricated from $MgH_2$ and B or Mg and B powders. The methods such as hydrostatic extrusion and rolling were used. The samples were annealed under high Ar gas pressure (hot isostatic pressing) at 750°C and 1.0 GPa for 40 min. It was found that critical current of $MgB_2$/Fe superconducting wire or tape with nano-SiC dopant increased in higher magnetic field values in comparison to pure $MgB_2$. A significant difference of $J_c$ in tapes made by in situ way from $MgH_2$ and Mg were found.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 371-374
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pinning Force in Superconducting Wires Nb-Ti
    Autorzy:
    Gajda, D.
    Zaleski, A.
    Dyakonov, V.
    Matrosov, N.
    Szymczak, H.
    Beloshenko, V.
    Spuskanyuk, V.
    Chishko, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537076.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.71.Mn
    Opis:
    In the paper we present the results of the measurements of critical current $I_{c}$ in NbTi wires. Experiments were made for the wires of 0.3 mm in diameter and the length of 25 mm. The wires were produced by means of two methods: conventional (hydroextrusion and drawing) and preliminary equal channel multiple angle pressing. The samples were heat treated at different temperatures. We describe the influence of different pinning centers on critical current density $J_{c}$.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 364-365
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion exchange investigation for recovery of uranium from acidic pregnant leach solutions
    Autorzy:
    Danko, B.
    Dybczyński, R. S.
    Samczyński, Z.
    Gajda, D.
    Herdzik-Koniecko, I.
    Zakrzewska-Kołtuniewicz, G.
    Chajduk, E.
    Kulisa, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/147778.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    uranium recovery
    acidic pregnant leach solution
    ion exchange separation
    Opis:
    The article describes studies on the separation of uranium from acid pregnant leach solutions obtained from Polish uranium ores: dictyonema shales and sandstone rocks. Ion exchange chromatography was applied for uranium sorption, using commercially available, strongly basic anion exchanger, Dowex 1. In model experiments, the influence of degree of crosslinking of Dowex 1 on the efficiency of uranium extraction was investigated. The effect of H2SO4 concentration on the breakthrough curve of uranyl ions for the Dowex 1 resins, of different crosslinking: X4, X8 and X10, was examined. Unexpectedly high increase of exchange capacity of uranium was observed in case of Dowex 1X10. This gives potential opportunity of improving the effectiveness of uranium recovery process. Applying column packed with Dowex 1X10, ‘yellow cake’ with ca. 92% yield and high purity of recovered uranium was obtained. A block diagram of the procedure for uranium and lanthanides extraction from acidic leach liquor has been proposed.
    Źródło:
    Nukleonika; 2017, 62, 3; 213-221
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dictyonema black shale and Triassic sandstones as potential sources of uranium
    Autorzy:
    Kiegiel, K.
    Zakrzewska-Kołtuniewicz, G.
    Gajda, D.
    Miśkiewicz, A.
    Abramowska, A.
    Biełuszka, P.
    Danko, B.
    Chajduk, E.
    Wołkowicz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147500.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    uranium ores
    leaching
    extraction
    ion-exchange chromatography
    precipitation
    Opis:
    The main objective of the present study was an assessment of the possibility of uranium recovery from domestic resources in Poland. In the fi rst stage uranium was leached from the ground uranium ore by using acidic (sulfuric acid or hydrochloric acid) or alkaline (carbonate) solutions. The leaching efficiencies of uranium were dependent on the type of ore and it reached 81% for Dictyonemic shales and almost 100% for sandstones. The novel leaching routes, with the application of the helical membrane contactor equipped with rotating part were tested. The obtained postleaching solutions were concentrated and purifi ed using solvent extraction or ion exchange chromatography. New methods of solvent extraction, as well as hybrid processes for separation and purifi cation of the product, were studied. Extraction with the use of membrane capillary contactors that has many advantages above conventional methods was also proposed as an alternative purification method. The fi nal product U3O8 could be obtained by the precipitation of ‘yellow cake’, followed by calcination step. The results of precipitation of ammonium diuranate and uranium peroxide from diluted uranium solution were presented.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 515-522
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconducting and Microstructural Properties of (Mg+2B)+MgB$\text{}_{2}$/Cu Wires Obtained by High Gas Pressure Technology
    Autorzy:
    Kario, A.
    Morawski, A.
    Głowacki, B. A.
    Łada, T.
    Smaga, M.
    Diduszko, R.
    Kolesnikov, D.
    Zaleski, A. J.
    Kondrat, A.
    Gajda, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047331.pdf
    Data publikacji:
    2007-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.71.Mn
    Opis:
    In order to improve the overall critical current characteristics of Cu sheathed in situ MgB$\text{}_{2}$ wires a special architecture of the wire, and processing parameters were used. The study presents the influence of the ex situ MgB$\text{}_{2}$ chemical barrier between ex situ core and Cu, suppressing the reaction of Cu with Mg. Wires, doped with 10 at.% SiC of 18 nm average grain size, were fabricated from MgH$\text{}_{2}$ and B or from Mg and B powders, using the powder-in-tube method. The methods of rotary swaging or drawing were used as the alternating wire-forming processes. The samples were annealed under high Ar gas pressure (hot isostatic pressing) at 750ºC and 1.0 GPa for 15 and 30 min. A significant difference in Cu distribution across the wires for a long and short time of sintering was observed. The formation of microstructure in the powder-in-tube process and the relationship between the microstructure and critical current density J$\text{}_{c}$ values, are discussed in this paper.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 5; 693-703
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustic analysis assessment in speech pathology detection
    Autorzy:
    Panek, D.
    Skalski, A.
    Gajda, J.
    Tadeusiewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/329710.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    linear PCA
    nonlinear PCA
    autoassociative neural network
    validation
    voice pathology detection
    Opis:
    Automatic detection of voice pathologies enables non-invasive, low cost and objective assessments of the presence of disorders, as well as accelerating and improving the process of diagnosis and clinical treatment given to patients. In this work, a vector made up of 28 acoustic parameters is evaluated using principal component analysis (PCA), kernel principal component analysis (kPCA) and an auto-associative neural network (NLPCA) in four kinds of pathology detection (hyperfunctional dysphonia, functional dysphonia, laryngitis, vocal cord paralysis) using the a, i and u vowels, spoken at a high, low and normal pitch. The results indicate that the kPCA and NLPCA methods can be considered a step towards pathology detection of the vocal folds. The results show that such an approach provides acceptable results for this purpose, with the best efficiency levels of around 100%. The study brings the most commonly used approaches to speech signal processing together and leads to a comparison of the machine learning methods determining the health status of the patient.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 3; 631-643
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    HP-HGS strategy for inverse AC/DC resistivity logging measurement simulations
    Autorzy:
    Gajda-Zagórska, E.
    Paszyński, M
    Schaefer, R.
    Pardo, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/305666.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    resistivity logging simulations
    adaptive finite element method
    hierarchical genetic search
    inverse problems
    Opis:
    In this paper, we present resistivity-logging-measurement simulation with the use of two types of borehole logging devices: those which operate with zero frequency (direct current, DC) and those with higher frequencies (alternate current, AC). We perform simulations of 3D resistivity measurements in deviated wells, with a sharp angle between the borehole and formation layers. We introduce a hierarchical adaptive genetic strategy hp−HGS interfaced with an adaptive finite element method. We apply a strategy for the solution of the inverse problem, where we identify the resistivities of the formation layers based on a given measurement. We test the strategy on both direct and alternate current cases.
    Źródło:
    Computer Science; 2013, 14 (4); 629-644
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pharmacokinetics and pharmacodynamics of a single dose of sustained-release azithromycin formulation in pigeons
    Autorzy:
    Zań, R.
    Burmańczuk, A.
    Stępień-Pyśniak, D.
    Gajda, A.
    Gbylik-Sikorska, M.
    Posyniak, A.
    Kowalski, C.
    Grabowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087364.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    azithromycin
    pigeon
    pharmacokinetics
    pharmacodynamics
    dose
    Źródło:
    Polish Journal of Veterinary Sciences; 2020, 23, 1; 43-50
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Erotetic Reasoning Corpus. A data set for research on natural question processing
    Autorzy:
    Łupkowski, P.
    Urbański, M.
    Wiśniewski, A.
    Błądek, W.
    Juska, A.
    Kostrzewa, A.
    Pankow, D.
    Paluszkiewicz, K.
    Ignaszak, O.
    Urbańska, J.
    Żyluk, N.
    Gajda, A.
    Marciniak, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/103809.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Podstaw Informatyki PAN
    Tematy:
    question
    logic of question
    question processing
    erotetic reasoning
    corpus annotation
    Opis:
    The aim of this paper is to present the Erotetic Reasoning Corpus (ERC) which constitutes a data set for research on natural question processing. We describe the theoretical background, linguistic data and tags used for the annotation process. We also discuss the potential areas in which the ERC can be exploited.
    Źródło:
    Journal of Language Modelling; 2017, 5, 3; 607-631
    2299-856X
    2299-8470
    Pojawia się w:
    Journal of Language Modelling
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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