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    Wyświetlanie 1-15 z 15
    Tytuł:
    Identification of High-resistance Earth Faults in Medium Voltage Networks Using Higher Harmonics
    Identyfikacja zwarć doziemnych wysokorezystancyjnych w sieciach średnich napięć z wykorzystaniem wyższych harmonicznych
    Autorzy:
    Marciniak, L.
    Piątek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/397117.pdf
    Data publikacji:
    2017
    Wydawca:
    ENERGA
    Tematy:
    high non-linear short-circuit resistance
    higher harmonics
    earth fault protection
    duża nieliniowa rezystancja zwarcia
    wyższe harmoniczne
    zabezpieczenie ziemnozwarciowe
    Opis:
    One way to detect line-to-earth arc faults and high-resistance faults in compensated medium voltage networks is based on the criterion of reactive power of higher harmonics in zero sequence voltage and current components. The harmonic content of currents and voltages was evaluated as a function of non-linear short-circuits resistance parameters. This criterion-based earth fault protection’s model is described. Examples of high-resistance fault detection are attached.
    Jeden ze sposobów wykrywania zwarć doziemnych łukowych i zwarć wysokorezystancyjnych w kompensowanych sieciach średnich napięć jest oparty na zastosowaniu kryterium mocy biernej wyższych harmonicznych składowych symetrycznych zerowych prądu i napięcia. Oceniono zawartość harmonicznych w prądach i napięciach w funkcji parametrów nieliniowej rezystancji zwarcia. Opisano model zabezpieczenia ziemnozwarciowego z zastosowaniem tego kryterium. Załączono przykłady detekcji zwarć wysokorezystancyjnych.
    Źródło:
    Acta Energetica; 2017, 1; 50-57
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accuracy of the photogrametric measuring system for large size elements
    Autorzy:
    Grzelka, M.
    Budzik, G.
    Marciniak, L.
    Gapiński, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/379891.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photogrammetry
    coordinate measuring technique
    maximum permissible error
    size measurement
    optical coordinate measuring system
    fotogrametria
    współrzędnościowa technika pomiarowa
    błąd maksymalny dopuszczalny
    pomiar wielkości
    optyczna współrzędnościowa technika pomiarowa
    Opis:
    The aim of this paper is to present methods of estimating and guidelines for verifying the accuracy of optical photogrammetric measuring systems, using for measurement of large size elements. Measuring systems applied to measure workpieces of a large size which often reach more than 10000mm require use of appropriate standards. Those standards provided by the manufacturer of photogrammetric systems are certified and are inspected annually. To make sure that these systems work properly there was developed a special standard VDI / VDE 2634, "Optical 3D measuring systems. Imaging systems with point - by - point probing. " According to recommendations described in this standard research on accuracy of photogrametric measuring system was conducted using K class gauge blocks dedicated to calibrate and test accuracy of classic CMMs. The paper presents results of research of estimation the actual error of indication for size measurement MPEE for photogrammetric coordinate measuring system TRITOP.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 75-80
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnostic systems for the nuclear fusion and plasma research in the PF-24 plasma focus laboratory at the IFJ PAN
    Autorzy:
    Marciniak, Ł.
    Wójcik-Gargula, A.
    Kulińska, A.
    Bielecki, J.
    Wiącek, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/147710.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    diagnostics for DD fusion products
    fast neutron sources
    plasma diagnostics
    plasma focus
    plasma imaging
    Opis:
    This paper presents a set of diagnostics dedicated to PF-24 – new medium size – plasma focus (PF) device built and operated at the Institute of Nuclear Physics Polish Academy of Sciences (IFJ PAN). The PF-24 can operate at energy level up to 93 kJ and charging voltage up to 40 kV. Each condenser is connected with a specially designed spark gap with a very small jitter, which ensures a high efficiency and a low current rise time. The working parameters of PF-24 generator make it a suitable tool for testing new detection systems to be used in fusion research. Four types of such detection systems are presented in this article: three diagnostic systems used to measure electric quantities (Rogowski coil, magnetic probe, capacitance probe), neutron counter based on beryllium activation, fast neutron pinhole camera based on small-area BCF-12 plastic scintillation detectors and high-speed four-frame soft X-ray camera with microchannel plate.
    Źródło:
    Nukleonika; 2016, 61, 4; 413-418
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accuracy of the element geometry mapping using non-invasive computer tomography method
    Autorzy:
    Grzelka, M.
    Marciniak, L.
    Gapinski, B.
    Budzik, G.
    Trafarski, A.
    Augustyn-Pieniazek, J.
    Gaca, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/384351.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    computer tomography
    optical coordinate measuring technique
    reverse engineering
    accuracy of workpiece mapping
    Opis:
    Non-invasive method of the measurement and identification of shape and geometrical characteristics of measured detail based on the computer tomograph is widely applied in medicine with high efficiency. The paper is aimed at presenting the metrological analysis of the accuracy of shape reproduction. The examined shape was described due to the tomography and compared to the results of coordinate measurement. The comparative accuracy analysis of the tomography was performed for the typical details, as well as for the masters made with high accuracy. Using the results of the analysis, the respective models of measured details were created and used as a nominal in the further investigations. The results of the measurement with tomography were compared with the results achieved from the measurement by means of typical coordinate measuring machines and by means of 3D measurement optical scanner. Analysis of the gained values of the form deviations and important geometrical characteristics enabled to perform complex analysis of the shape reproduction of the examined detail with the method of computer tomography. The main purpose of the performed researches was the determination of the reproduction accuracy of surface measured with non-invasive computer tomography method. The investigations and analysis have been performed with the following equipment: computer tomograph, 3D printer and coordinate optical scanner supported with specialized software for advanced CAD data analysis.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2012, 6, 3; 23-26
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of IR thermography to show the mold and part temperature evolution in injection molding
    Autorzy:
    Bula, K.
    Różański, L.
    Marciniak-Podsadna, L.
    Wróbel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/94156.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    IR thermography
    injection molding process
    polypropylene
    termografia w podczerwieni (IR)
    formowanie wtryskowe
    polipropylen
    Opis:
    This study concerns the application of infrared camera for injection molding analysis by measuring temperatures of both injection molded parts and injection mold cavities in a function of injection cycles. The mold with two cavities, differing in thickness (1 and 3 mm), and a cold direct runner was used. Isotactic polypropylene homopolymer was utilized to produce parts. Mold temperature was set at 22OC and controlled by a water chiller. Five measuring points were determined: SP1, SP2 (placed in the 3 mm cavity), SP3, SP4 (located in the 1 mm cavity) and SP5 around an injection molding gate. Our investigations showed that the highest temperature is localized around SP2 point and the lowest at SP4. Also, it was proved that even after 62 injection molding cycles, temperatures of cavities were not stable, revealing their further increase with each cycle.
    Źródło:
    Archives of Mechanical Technology and Materials; 2016, 36; 40-43
    2450-9469
    Pojawia się w:
    Archives of Mechanical Technology and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Optimum-efficiency Beam Multiplier for an Arbitrary Number of Output Beams and Power Distribution
    Autorzy:
    Frezza, F.
    Marciniak, M.
    Pajewski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/308318.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    beam multipliers
    diffractive optical elements
    grating
    periodic structures
    Opis:
    This paper deals with phase gratings working in the paraxial domain. The profile of the optimum-efficiency beam multiplier with an arbitrary number of output diffraction orders is derived in an analytic form by exploiting methods from the calculus of variation. The output beams may be equi-intense or with arbitrary distribution of power. Numerical examples are given for different values of the number of output beams.
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 3; 94-98
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Main climatic changes in the Quaternary of Poland, Belarus and Ukraine
    Autorzy:
    Lindner, L.
    Gozhik, P.
    Marciniak, B.
    Mars, L.
    Yelovicheva, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058786.pdf
    Data publikacji:
    2004
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Polska
    Belarus
    Ukraine
    Quaternary
    glaciations and coolings
    interglacials and warmings
    loess
    palaeosols
    Opis:
    26 units are described and correlated, representing the main climatic episodes during the Quaternary in Poland, Belarus and Ukraine. They comprise 13 cool and 13 warm intervals. The four oldest ones are Różcian (Olkhovskian, Siver), Ponurzycian (Grushevskian, Beregovo), Otwockian (Vselubskian, Berezan) and Celestynovian (Yelenynskian, Kryzhaniv); these correspond to Praetiglian, Tiglian, Eburonian and Menapian, respectively of the Early Pleistocene in the Netherlands. In Poland this part of the Quaternary is named the Pre-Glacial or the Pre-Pleistocene. The Mid and Late Quaternary (the glacial epoch in Europe) comprises 11 glaciations or global coolings, namely the Narevian in Poland (Zhlobynskian, Ilyichivsk), the younger pre-Augustovian (Rogachevian 1/2, Shirokino 1/2), Augustovian 1/2 (Rogachevian 2/3, Shirokino 2/3), Nidanian (Narevian in Belarus, Pryazovsk), Sanian 1 (Servetskian, Sula), Ferdynandovian 1/2 (Belovezhian 1/2, Lubny 1/2), Sanian 2 (Berezinian, Tiligul), Liviecian (Orel), Krznanian (Dnieper 1), Odranian+Wartanian (Dnieperian+Sozhian, Dnieper 2 = Tyasmyn), Vistulian (Poozerian, Valday); and 10 interglacials or global warmings: early pre-Augustovian (Rogachevian 1, Shirokino 1), Augustovian 1 (Rogachevian 2, Shirokino 2), Augustovian 2 (Rogachevian 3, Shirokino 3) ,Małopolanian (Korchevian,Martonosha), Ferdynandovian 1 (Belovezhian 1, Lubny 1), Ferdynandovian 2 (Belovezhian 2, Lubny 2), Mazovian (Alexandrian, Zavadivka), Zbójnian (Smolenskian, Potagaylivka), Lubavian (Shklovian, Kaydaky), Eemian (Muravian, Pryluky) and Holocene. All these units are correlated with oxygen isotope stages identified in deep-sea sediments, shown relative to the palaeomagnetic epochs and correlated with main cool and warm stratigraphic units of Western Europe. Particular attention was placed on correlation of glacial and lake deposits, loesses and palaeosols.
    Źródło:
    Geological Quarterly; 2004, 48, 2; 97--114
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer Application System for Operational Efficiency of Diesel Railbuses
    Autorzy:
    Wojciechowski, Ł.
    Cisowski, T.
    Marciniak, J.
    Palchevskyi, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/117699.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    computer algorithm
    economy and management
    information applications systems
    Opis:
    The article presents a computer algorithm to calculate the estimated operating cost analysis rail bus. This computer application system compares the cost of employment locomotive and wagon, the cost of using locomotives and cost of using rail bus. An intensive growth of passenger railway traffic increased a demand for modern computer systems to management means of transportation. Described computer application operates on the basis of selected operating parameters of rail buses.
    Źródło:
    Applied Computer Science; 2016, 12, 3; 85-99
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Outline of Quaternary glaciations in the Tatra Mts. : their development, age and limits
    Autorzy:
    Lindner, L.
    Dzierżek, J.
    Marciniak, B.
    Nitychoruk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058873.pdf
    Data publikacji:
    2003
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Tatra Mts.
    Pleistocene
    Holocene
    glaciers stratigraphy
    Opis:
    Geomorphological and geological data collected over many years suggest at least eight episodes during which the Tatra Mts. were glaciated during the Quaternary. Evidence of glaciers can be found both in the Slovakian and Polish parts of the mountains as glaciofluvial deposits located at different altitudes, and in some cases also as terminal and lateral moraines. There are no moraines for the three oldest glaciations, Biber, Donau and Günz, maybe as a result of less intense development of glaciers. During the Mindel (Sanian 2) Glaciation the glaciers occuped a larger area in the High Tatra Mts. in comparison to the Western Tatra Mts., whereas during the succeeding younger pre-Riss (Liviecian) Glaciation their development was more restricted. A greater extent of the Tatra Mts. glaciers occurred again during the Riss I (Odranian) Glaciation, while they were less extensive during the Riss II (Wartanian) Glaciation. During the Würm (Vistulian) Glaciation the glaciers were surprisingly large. This might have resulted from many factors, including changes in atmospheric circulation responsible for the distribution of precipitation, as well as changes in the position of the permanent snow limit due to climatic changes and/or neotectonic movements. Glaciers finally retreated from the Tatra Mts. by the end of the pre-optimal part of the Holocene.
    Źródło:
    Geological Quarterly; 2003, 47, 3; 269-280
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-Objective Evolutionary Optimization of Aperiodic Symmetrical Linear Arrays
    Autorzy:
    Napoli, F.
    Pajewski, L.
    Vescovo, R.
    Marciniak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/308614.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    antenna array
    Dolph-Chebyshev array
    genetic algorithms
    Opis:
    In this paper, a multi-objective approach is applied to the design of aperiodic linear arrays of antennas. The adopted procedure is based on a standard Matlab implementation of the Controlled Elitist Non-Dominated Sorting Genetic Algorithm II. Broadside symmetrical arrays of isotropic radiators are considered with both uniform and non-uniform excitations. The work focuses on whether, and in which design conditions, the aperiodic solutions obtained by the adopted standard multi-objective evolutionary procedure can approximate or outperform the Pareto-optimal front for the uniformspacing case computable by the Dolph-Chebyshev method.
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 3; 79-87
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Behaviour of steel with the metastable austenite during segmental grinding
    Autorzy:
    Dąbrowski, L.
    Jeleńkowski, J.
    Marciniak, M.
    Szczęśniak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/132144.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    segmental grinding
    temperature registration
    metastable austenite
    deformation martensite
    phase transformation
    Opis:
    The methods of the grinding process efficiency evaluation have been presented in this paper basing upon the temperature in the workpiece tool contact area. The technique of determining this temperature has also been given as a combination of analytical and experimental process. These are especially useful by properties and phase transformation investigations in the metastable austenite steels.
    Źródło:
    Advanced Technologies in Mechanics; 2014, 1, no. 1 (1); 32-40
    2392-0327
    Pojawia się w:
    Advanced Technologies in Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The age of the oldest Scandinavian glaciations in mid-eastern Poland and southwestern Belarus
    Autorzy:
    Lindner, L.
    Marciniak, B.
    Sanko, A. F.
    Khursevich, G. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059317.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Polska
    Belarus
    Early Pleistocene
    Scandinavian glaciations
    stratigraphic correlation
    Opis:
    Analysis of type localities of Pleistocene deposits from mid-eastern Poland (Kozi Grzbiet, Łuków, Biała Podlaska and Wilczyn) and southwestern Belarus (Smolarka and Postolovo) has provided a new view on the age, limits and correlation of the oldest Scandinavian glaciations in the area. Integration of palaeontological data with determination of the Brunhes/Matuyama boundary (780 ka) at Kozi Grzbiet and Smolarka suggests that the first glaciation (Narevian) preceded this boundary and had a slightly smaller extent in SW Belarus than hitherto considered. The second glaciation (Nidanian) occurred slightly above or at this palaeomagnetic boundary. In Poland it is the first South Polish Glaciation, a till of which can be traced as far as the Holy Cross Mts. In SW Belarus it is represented by a till to the south of Brest and Bereza, and connected there with the oldest glaciation.
    Źródło:
    Geological Quarterly; 2001, 45, 4; 373-396
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement of Air-ground Matching by Means of a Chirped Multilayer Structure: Electromagnetic Modeling with the Method of Single Expression
    Autorzy:
    Baghdasaryan, H.
    Knyazyan, T.
    Hovhannisyan, T.
    Marciniak, M.
    Pajewski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/958078.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    chirped multilayer structure
    ground matching
    method of single expression
    Opis:
    The enhancement of air-ground electromagneticmatching by means of a chirped multilayer structure is inves-tigated. The modeling and simulation of the considered struc-ture are performed by using the method of single expression(MSE), which is a convenient and accurate tool for wavelength-scale simulations of multilayers comprising lossy, amplifyingor nonlinear (Kerr-type) materials. Numerical results showthat a suitable chirped multilayer structure can reduce the re- ection from the ground. Different values of the number oflayers and of the layer thicknesses are considered. The distributions of the electric eld components and the power owdensity within the modelled structures are calculated.
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 3; 30-36
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radial fan controlled with impeller movable blades – CFD investigations
    Autorzy:
    Jóźwik, K.
    Papierski, A.
    Sobczak, K.
    Obidowski, D.
    Kryłłowicz, W.
    Marciniak, E.
    Wróbel, G.
    Marciniak, A.
    Wróblewski, P.
    Kobierska, A.
    Frącczak, Ł.
    Podsędkowski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/175168.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    radial fan control systems
    CFD methods
    radial fan performance
    partial load
    Opis:
    Modern classical power generation systems, based on power plants in Poland, where coal (hard bituminous coal or lignite) is the primary energy source, operate under variable loading conditions. Thus, all machines working in the technological system of the power generation unit are required to be adapted to variable loading, and, consequently, to operate beyond the design point of their performance characteristics. High efficiency of the process requires the efficiency of individual devices to be high, beyond the design point, as well. For both air and exhaust gases fans, an effective control system is needed to attain a high level of efficiency. As a result of cooperation between two institutes from the Faculty of Mechanical Engineering, Lodz University of Technology, and the Vibroson company, a new design of the radial fan with impeller movable blades, which allows for controlling the device operation within a wide range, has been developed. This new design and determination the performance characteristics for two geometrical variants of blades with computational fluid dynamics methods are presented. The obtained results have been compared to the results of the measurements of fan performance curves conducted on the test stand.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 131; 17-40
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental Analysis of a Directive Antenna with a 3D-EBG Superstrate
    Autorzy:
    Pajewski, L.
    Frezza, F.
    Marciniak, M.
    Piuzzi, E.
    Rossi, G. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/307787.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    directivity enhancement
    electromagnetic bandgap materials
    Fabry-Perot cavities
    periodic structures
    woodpile
    Opis:
    A three-dimensional electromagnetic crystal is employed as a directivity-enhancing superstrate for planar antennas. The crystal is a woodpile made of alumina rods. In a shielded anechoic chamber, the performance of a patch antenna covered with the woodpile is measured. The superstrate is positioned at different distances from the antenna and its orientation is varied in the 8–12 GHz frequency range. The return loss, gain and radiation pattern in the E- and H-planes are measured. The electromagnetic behavior of Fabry-Perot cavities with woodpile mirrors, equivalent to the compound radiator, is also studied. The main effect of the crystal on the antenna performance is an enhancement of about 10 dB in maximum gain. A rather complete series of experiments is presented, highlighting the role of the periodic structure in the directivity enhancement and allowing a deeper understanding of the electromagnetic phenomena involved in EBG resonator antennas. Benefits and disadvantages of this kind of antennas are discussed and ideas for future research are given.
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 3; 113-124
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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