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    Wyświetlanie 1-12 z 12
    Tytuł:
    Vibration Diagnostics as an effective Tool for Testing Engines of Internal Combustion
    Autorzy:
    Domotor, F.
    Szabo, J. Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/111686.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    engines
    vibration
    diagnostics
    spectrum
    rolling bearing
    silnik
    silnik spalinowy
    wibrodiagnostyka
    łożysko toczne
    Opis:
    There are several methods of automotive diagnostics used in services to detect a large variety of faults and damages of various parts of engines of internal combustion. Undoubtedly, they are effective, but they are simply unable to find all types of mechanical faults occurring during the operation. This is the reason why authors of this paper tried to use a special tool, which has been proven for years for detecting faults of rolling element bearing in rotating machinery. During their research, the authors tried to find valuable results by measuring vibration of various parts of engines. Three items were tested, a Diesel engine and two Otto motors. A large number of measurements have been taken at various speed, at different points, in different directions, with different parameter setup, etc. However, there was one setup which has been applied to all three engines. It is the measurement setup of vibration velocity, in the frequency range of 2 Hz-300 Hz. Valuable consequences have been found regarding the clogging of the air filters and the exhaust systems. As a conclusion the authors expressed their opinion, that, apart from the traditional diagnostic methods used in services, vibration measurements can also be useful, especially for detecting faults of rolling element bearings.
    Źródło:
    Production Engineering Archives; 2017, 16; 3-6
    2353-5156
    2353-7779
    Pojawia się w:
    Production Engineering Archives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Introduction and spreading of IPM and integrated apple production in Hungary
    Wprowadzanie i rozwój zintegrowanych metod ochrony przed szkodnikami oraz integrowanej produkcji jabłek na Węgrzech
    Autorzy:
    Lehota, J.
    Szabo, Z.
    Lehota, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/868672.pdf
    Data publikacji:
    2010
    Wydawca:
    The Polish Association of Agricultural and Agribusiness Economists
    Opis:
    No accurate statistics are available concerning the amounts and value of the crop protection chemicals used in fruit production in Hungary. The quantity of chemicals used dropped dramatically between 1990 and 2001, to 2.1 kg/ha. One important consideration from the aspect of evaluating the decrease in the quantities of chemicals used is that the crop protection technology and the range of the chemicals used changed significantly during the period concerned. The research project took place in the framework of the No. 6 Network of Excellence frame programme and the European Network for Durable Exploitation of Crop Protection Strategies programme (No. 3.5 sub-programme: Societal Assessment of Current and Novel Low Input Crop Protection Strategies), between 2007 and 2010. Possibilities of integrated crop protection and integrated production in apple production were studied in the framework of the sub-programme with the involvement of six countries (Switzerland, France, the Netherlands, the United Kingdom, Hungary and Poland). Five main elements affecting the spreading of integrated production were studied in the framework of the sub-programme public politics, research and consultancy (advisory) services, farmers. cooperation, the development of marketing strategies and the role and impacts of civil society organisations. The Marketing Institute studied the impacts of the development of marketing strategies and those of retail chains playing a dominant role in the supply chain.
    W artykule dokonano analizy wpływu integrowanych metod produkcji na stretegie merketingowe sieci detallicznych na Węgrzech.
    Źródło:
    Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu; 2010, 12, 6
    1508-3535
    2450-7296
    Pojawia się w:
    Roczniki Naukowe Stowarzyszenia Ekonomistów Rolnictwa i Agrobiznesu
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    LPV design of fault-tolerant control for road vehicles
    Autorzy:
    Gáspár, P.
    Szabó, Z.
    Bokor, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331462.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    sterowanie odporne
    detekcja uszkodzeń
    sterowanie tolerujące uszkodzenia
    sterowanie pojazdem
    robust control
    fault detection
    LPV systems
    fault tolerant control
    vehicle dynamics
    vehicle control
    Opis:
    The aim of the paper is to present a supervisory decentralized architecture for the design and development of reconfigurable and fault-tolerant control systems in road vehicles. The performance specifications are guaranteed by local controllers, while the coordination of these components is provided by a supervisor. Since the monitoring components and FDI filters provide the supervisor with information about the various vehicle maneuvers and the different fault operations, it is able to make decisions about necessary interventions into the vehicle motions and guarantee reconfigurable and fault-tolerant operation of the vehicle. The design of the proposed reconfigurable and fault-tolerant control is based on an LPV method that uses monitored scheduling variables during the operation of the vehicle.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2012, 22, 1; 173-182
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Supervisory fault tolerant control of the GTM UAV using LPV methods
    Autorzy:
    Péni, T.
    Vanek, B.
    Szabó, Z.
    Bokor, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/330070.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fault tolerant control
    linear parameter varying systems
    supervisory architecture
    flight control
    sterowanie tolerujące uszkodzenia
    układ liniowy niestacjonarny
    sterowanie lotem
    Opis:
    A multi-level reconfiguration framework is proposed for fault tolerant control of over-actuated aerial vehicles, where the levels indicate how much authority is given to the reconfiguration task. On the lowest, first level the fault is accommodated by modifying only the actuator/sensor configuration, so the fault remains hidden from the baseline controller. A dynamic reallocation scheme is applied on this level. The allocation mechanism exploits the actuator/sensor redundancy available on the aircraft. When the fault cannot be managed at the actuator/sensor level, the reconfiguration process has access to the baseline controller. Based on the LPV control framework, this is done by introducing fault-specific scheduling parameters. The baseline controller is designed to provide an acceptable performance level along all fault scenarios coded in these scheduling variables. The decision on which reconfiguration level has to be initiated in response to a fault is determined by a supervisor unit. The method is demonstrated on a full six-degrees-of-freedom nonlinear simulation model of the GTM UAV.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 1; 117-131
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Input reconstruction by means of system inversion: A geometric approach to fault detection and isolation in nonlinear systems
    Autorzy:
    Edelmayer, A.
    Bokor, J.
    Szabo, Z.
    Szigeti, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/907385.pdf
    Data publikacji:
    2004
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    detekcja uszkodzeń
    lokalizacja uszkodzeń
    układ liniowy
    układ nieliniowy
    inwersja systemu
    fault detection
    fault isolation
    input reconstruction
    linear system
    nonlinear system
    system inversion
    Opis:
    In this paper the classical detection filter design problem is considered as an input reconstruction problem. Input reconstruction is viewed as a dynamic inversion problem. This approach is based on the existence of the left inverse and arrives at detector architectures whose outputs are the fault signals while the inputs are the measured system inputs and outputs and possibly their time derivatives. The paper gives a brief summary of the properties and existence of the inverse for linear and nonlinear multivariable systems. A view of the inversion-based input reconstruction with special emphasis on the aspects of fault detection and isolation by using invariant subspaces and the results of classical geometrical systems theory is provided. The applicability of the idea to fault reconstruction is demonstrated through examples.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2004, 14, 2; 189-199
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    "Red book" of the Hungarian landscapes atlas of the threaths on the natural functioning of the 229 Hungarian microregions
    Autorzy:
    Csorba, P.
    Szabo, J.
    Bodnar, R.
    Szilagyi, Z.
    Szabo, G.
    Szabo, S.
    Novak, T.
    Fazekas, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/87960.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Geograficzne
    Tematy:
    indexes for landscape functioning
    landscape fragmentation
    natural hazards
    land use change
    Hungary
    Opis:
    For the good established landscape planning landscape protection and landscape management actions have to take into consideration the actual conditions of the landscape elements. Earlier we dealt with the stability of the landscapes (Kerényi, Csorba, 1996), recently started to investigate the most important factors, which are endangers the proper functioning of the landscapes. Results are calculated for 229 microregions of the country, which are elements of the official landscape hierarchy of Hungary described in the Cadastral of Microregions of Hungary. The average size of the microregions are 100-500 km2. There are certain factors among which some have already elaborated, and others are being worked on yet. Degree of ecological fragmentation of the microregions by roads, railway lines and settlements was determined during the last year. In the case of large settlements the extent of inner parts, traffic intensities of the roads was taken into account, while in the case of railroads it was taken into consideration whether railway lines are single or double tracked. Results were purified using a weighting, where the location of the protected natural areas compared to the situation of the given settlement, roads or railroads was taken into consideration. In the calculations it was taken into account as well that the agglomeration processes of the large settlements may restrict the ecological gates and corridors of the migration of plant and animal species. From the series of maps on natural threats on microregional level, the map of the hazards of drought is presented first. The map gives a definite answer to the question, in which microregions is profitable to establish irrigation systems; and how high is the uncertainty of the rate of their utilization. Global warming, however, may modulate the map resented here remarkably in the next decades. Microregions that have been classified into transition categories with moderate or medium level of drought hazard may fall into categories of serious hazard of drought in the future. A synthesizing map has been completed by summing the seven datasets of the indicator group of natural hazards and the weighting of the subsets. Landscape planning is strongly affected by tendencies of macro economy on the present land use structure. EU agricultural policies have just started to affect strongly on Hungarian land use structure, therefore attempts have been made in order to forecast their impacts. Present Hungarian land use structure has been compared to priorities of the EU. Prospective shifts in land use structure have been determined for the 35 regions of Hungary. According to the 8-10 factors mentioned above, we shall have a detailed database to evaluate the microregions of Hungary in order to characterize the most threatened landscapes, and the most dangerous impacts on the landscape functioning.
    Źródło:
    Prace Komisji Krajobrazu Kulturowego; 2008, 8; 43-60
    1896-1460
    2391-5293
    Pojawia się w:
    Prace Komisji Krajobrazu Kulturowego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of soil texture determination using soil fraction data resulting from laser diffraction method
    Autorzy:
    Mako, A.
    Szabo, B.
    Rajkai, K.
    Szabo, J.
    Bakacsi, Z.
    Labancz, V.
    Hernadi, H.
    Barna, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082643.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    laser diffraction
    particle-size distribution
    pedotransfer function
    soil texture triangle
    Opis:
    There are global aspirations to harmonize soil particle- size distribution data measured by the laser diffraction method and by traditional sedimentation techniques, e.g. sieve-pipette methods. The need has arisen therefore to build up a database, containing particle-size distribution values measured by the sieving and pipette method according to the Hungarian standard (sieve-pipette methods-MSZ) and the laser diffraction method according to a widespread and widely used procedure. In our current publication, 155 soil samples measured with sieve-pipette methods-MSZ and laser diffraction method (Malvern Mastersizer 2000, HydroG dispersion unit) were compared. Through the application of the usual size limits at the laser diffraction method, the clay fraction was under- and the silt fraction was overestimated compared to the sieve-pipette methods-MSZ results, and subsequently the soil texture classes were determined according to the results of both methods also differed significantly from each other. Based on our previous experience, the extension of the upper size limit of the clay fraction from 2 to 7 μm increases the comparability of sievepipette methods-MSZ and laser diffraction method, in this way the texture classes derived from the particle-size distributions were also more in accordance with each other. The difference between the results of the two kinds of particle-size distribution measurement methods could be further reduced with the pedotransfer functions presented.
    Źródło:
    International Agrophysics; 2019, 33, 4; 445-454
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Andreev Reflection Spectroscopy Study of Spin Polarization in Co₂Cr(Fe)Al Heusler Alloys
    Autorzy:
    Hašková, V.
    Szabó, P.
    Kováč, J.
    Ryba, T.
    Vargová, Z.
    Varga, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385695.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.25.Ba
    74.45.+c
    77.80.bg
    Opis:
    The present paper is dealing with the experimental study of the influence of Fe substitution on the Curie temperature and spin polarization in Co₂CrAl Heusler alloys. A recently successfully introduced new rapid quenching method has been used for the preparation of Co₂CrAl and $Co₂Cr_{0.6}Fe_{0.4}Al$ ribbon samples. The Curie temperatures have been determined from magnetization measurements being 378 K for Co₂CrAl and much above 400 K for $Co₂Cr_{0.6}Fe_{0.4}Al$. The spin polarization parameter P₀ of the studied samples has been estimated from point-contact Andreev reflexion spectroscopy measurements. In pure Co₂CrAlP₀ = 0.5 - 0.9, and in the case of $Co₂Cr_{0.6}Fe_{0.4}AlP₀$ = 0.4 - 0.9. Hence, it is shown that Fe substitution of Cr in $Co₂Cr_{1-x}FeₓAl$ Heusler alloys at a concentration of x=0.4 significantly increase the Curie temperature without marked influence on the spin polarization.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 377-378
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Suppress or accept? A pilot study to evaluate the effect of coping strategies on ERN amplitude among individuals with obsessive-compulsive traits
    Autorzy:
    Zambrano-Vazquez, Laura
    Szabo, Yvette Z
    Santerre, Craig Lee
    Allen, John J.B
    Powiązania:
    https://bibliotekanauki.pl/articles/2106142.pdf
    Data publikacji:
    2019-11-22
    Wydawca:
    Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
    Tematy:
    ERN
    OCD
    intrusions
    suppression
    acceptance
    Opis:
    Intrusive thoughts are characteristic of psychological disorders; attempts to cope can become maladaptive perpetuating the problem (e.g., thought suppression), while others can provide long-term symptoms relief (e.g., acceptance). Although emerging research begins to explore the neural correlates of these strategies in healthy population, it is important to explore these strategies in populations more likely to naturally attempt to use such strategies (clinical symptoms). The present study explored if the use of cognitive strategies to manage intrusive cognitions would be differentially reflected in psychophysiological measures (i.e., error-related negativity) of individuals characterized by obsessive-compulsive symptoms -a group commonly associated with suppression efforts- relative to a low OC control. 67 participants with high and low OC symptoms were randomly assigned to cognitive strategy (suppression or acceptance). Participants watched an emotion-eliciting video clip and used the assigned cognitive strategy while performing the Stroop task. EEG data was collected. Consistent with well-established and emerging literature, ERN was enhanced in individuals with high OC symptoms and a marginal effect of thought-control strategy was observed, such that ERN amplitude was reduced in the suppression condition and greater for the acceptance condition. Uniquely, the study expanded on emerging literature by exploring whether the relationship between ERN and cognitive strategies was moderated by OC level. Although results were not conclusive, these preliminary findings represent an important first step to study effects of suppression and acceptance on the ERN in a sample characterized by clinically-relevant symptoms and overall encourage further exploration.
    Źródło:
    Acta Neuropsychologica; 2019, 17(3); 283-300
    1730-7503
    2084-4298
    Pojawia się w:
    Acta Neuropsychologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Point-Contact Spectroscopy of Superconducting $MgCNi_3$ Single Crystals
    Autorzy:
    Pribulová, Z.
    Szabó, P.
    Kačmarčík, J.
    Samuely, P.
    Jang, D.
    Lee, H.
    Lee, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813611.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    Opis:
    The first point-contact spectroscopy measurements on $MgCNi_3$ single crystals of very good quality are presented. The measurements have been performed in the temperature range from 1.5 K up to 10 K and at magnetic fields up to 6 T. The superconducting energy gap Δ of the system is found to be scattered between 1 and 1.2 meV which gives the 2Δ/k $T_c$ ratio between BCS weak-coupling value of ~3.5 and a strong coupling of about 4.2. The excess current evaluated in magnetic field indicates the presence of a single energy gap.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 215-218
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Point Contact Spectroscopy Measurements of $Ba(Fe_{0.96}Co_{0.04})_2As_2$ Single Crystals
    Autorzy:
    Szabó, P.
    Girovský, J.
    Pribulová, Z.
    Samuely, T.
    Bud'ko, S.
    Canfield, P.
    Samuely, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535447.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.50.+r
    74.70.Ad
    74.62.Dh
    Opis:
    Point contact spectroscopy results are presented on the electron underdoped $Ba(Fe_{0.96}Co_{0.04})_2As_2$ single crystals. Two superconducting energy gaps with coupling values 2 $Δ_1$ ∿ $kT_{c}$ ≈ 2.55 and 2 $Δ_2$ ∿ $kT_{c}$ ≈ 11 at $T_{c}$ = 15.5 K have been observed in the point contact spectra. The temperature dependence of the normal state background of the point contact spectra observed between $T_{c}$ and $T_{N}$ indicates antiferromagnetic origin of the V-shaped minimum at zero bias.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1045-1046
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Magnetic Characterization of NiMnSb Half-Heusler Alloy Prepared by Rapid Quenching
    Autorzy:
    Ryba, T.
    Vargova, Z.
    Varga, R.
    Ilkovic, S.
    Reiffers, M.
    Haskova, V.
    Szabo, P.
    Kravcak, J.
    Gyepes, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1368037.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.50.Cc
    Opis:
    NiMnSb half-Heusler alloy in the form of a rod has been prepared by rapid quenching (suction-casting) method. The rod is characterized by single phase $C1_b$ crystalline structure with lattice parameter a=5.982 Å. Magnetic measurements reveal an isotropic character of bulk NiMnSb alloy. Our study shows relatively high spin polarization of bulk NiMnSb in the range 35-50%.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 206-207
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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