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    Wyświetlanie 1-14 z 14
    Tytuł:
    A Comparison of Proximity Sensors for a Bicycle-to-Car Distance Rangefinder
    Autorzy:
    Zieliński, Bartłomiej
    Powiązania:
    https://bibliotekanauki.pl/articles/1844684.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distance measurement
    road traffic
    proximity sensors
    Opis:
    In the article, three types of proximity sensors that might be used in bicycle rangefinder to measure the distance between the bicycle and an overtaking car are compared. The influence of various factors on the accuracy of the distance measurements obtained using ultrasonic, infrared and laser sensors is tested, among others, light conditions, car surface type and colour, rain, pollination and vibrations.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 2; 277-282
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of end-winding proximity losses in a high-speed PM machine
    Autorzy:
    Mlot, A.
    Lukaniszyn, M.
    Korkosz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141443.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    end-winding
    permanent magnet motor
    eddy-currents losses
    proximity losses
    Opis:
    This paper presents a finite element investigation into the proximity losses in a high-speed permanent magnet (PM) machine for traction applications. A three-dimensional (3D) finite element analysis (FEA) is employed to evaluate and identify the endwinding contribution into the overall winding power loss generated. The study is focused on the end-winding effects that have not been widely reported in the literature. The calculated results confirm that the end-winding copper loss can significantly affect the eddycurrent loss within copper and it should be taken into account to provide reasonable prediction of total losses. Several structures of the end-winding are analyzed and compared in respect to the loss and AC resistance. The results clearly demonstrate that the size of the end-winding has a significant impact on the power loss. The calculated results are validated experimentally on the high-speed permanent magnet synchronous machine (PMSM) prototype for selected various winding arrangements.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 2; 249-261
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Frequency Reconfigurable Antenna Using Proximity Fed Technique for Wireless Applications
    Autorzy:
    Fatimi, Aziz El
    Bri, Seddik
    Saadi, Adil
    Powiązania:
    https://bibliotekanauki.pl/articles/963832.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    frequency reconfigurable antenna
    patch antenna
    proximity coupled antenna
    rotatable antenna
    Opis:
    This electronic paper presents an innovative technology for efficient use of the radio spectrum. This new frequency reconfigurable rotatable antenna is intended for wireless applications such as WLAN, WiMAX and Bluetooth mobile applications. The working principle of this proposed work is to print square patches mounted on the same circular dielectric substrate feed by a proximity coupling to eliminate the noise signal transmission and problems related to interference. The three positions correspond to an operating frequency controlled by a bipolar step-by-step engine. An optimization of the structure using the FEM finite element method as well as a comparison with other structures recently realized are detailed in this paper. The final numerical simulation results are: WLAN 4.95-5.53 GHz (BW = 11%) Gain = 6.06 dBi, WiMAX 3.35-3.75 GHz (BW = 11.2%) Gain = 7.48 dBi and Bluetooth 2.3-2.51 GHz (BW = 8.7%) Gain = 17.78 dBi.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 2; 181-187
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proximity in Coalition Building
    Autorzy:
    Reynaud, Julien
    Lange, Fabien
    Gątarek, Łukasz T.
    Thimann, Christian
    Powiązania:
    https://bibliotekanauki.pl/articles/483361.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    voting power index
    coalition building
    International Monetary Fund
    linkage
    proximity
    Opis:
    Voting power methodology offers insights to understand coalition building in collective decision making. This paper proposes a new measure of voting power inspired from Banzhaf (1965) accounting for the proximity between voters by capturing how often they appear in winning coalitions together. Using this proximity index, we introduce a notion of relative linkages among coalition participants as determinant of coalition building. We propose an application to the governance structure of the International Monetary Fund, with linkages being represented by bilateral volumes of trade between voters. The results are able to explain several important features of the functioning of this particular voting body, and may be useful for other applications in international politics.
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2011, 3, 3; 111-132
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Znaczenie bliskości w nawiązywaniu współpracy naukowej przez polskich naukowców
    The scientific centre standing and the establishment of scientific collaboration
    Autorzy:
    Celińska-Janowicz, Dorota
    Wojnar, Katarzyna
    Olechnicka, Agnieszka
    Płoszaj, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/577797.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    współpraca naukowa
    geografia nauki
    bliskość
    scientific collaboration
    geography of science
    proximity
    Opis:
    W ostatnich dziesięcioleciach nastąpiła bezprecedensowa intensyfi kacja różnych wymiarów współpracy naukowej. W Polsce skala współpracy, zwłaszcza zagranicznej, jest wyraźnie niższa niż w większości krajów europejskich. Celem artykułu jest analiza mechanizmów i preferencji w zakresie nawiązywania współpracy naukowej przez polskich naukowców. Wykorzystując koncepcję bliskości R. Boschmy zbadano jakie jest znaczenie różnych kategorii bliskości w nawiązywaniu współpracy naukowej w zależności od rangi ośrodka naukowego. Analizę oparto na 61 wywiadach z pracownikami naukowymi uczelni wyższych i instytutów badawczych w czterech polskich ośrodkach naukowych. Badania wykazały, że w procesach nawiązywania współpracy największe znaczenie miała bliskość kognitywna, a w dalszej kolejności także organizacyjna i społeczna. Bliskość geograficzna i instytucjonalna miały minimalne znaczenie. Ponadto, dla naukowców z ośrodków peryferyjnych kontakty krajowe odgrywały istotną rolę w nawiązywaniu współpracy zagranicznej. Na podstawie uzyskanych wyników sformułowano rekomendacje dla polityki naukowej służące rozwojowi współpracy naukowej
    In the recent few decades we have witnessed unprecedented intensifi cation of scientific collaboration worldwide. In Poland, the scale of collaboration, especially international, is clearly lower than in most of the European countries. The aim of the article is to analyze the mechanisms and preferences of establishing scientific collaboration by the Polish researchers. Using R. Boschma’s concept of proximity we investigated how the role of various types of proximity differs in establishing scientific collaboration depending on the standing of a scientific centre. The analysis is based on 61 interviews with scientists in four Polish cities. It was revealed that in establishing scientific collaboration the most important was cognitive proximity, and – to a lesser extent – organizational and social. Geographical and institutional proximities were of a minor signifi cance. Additionally, for scientists from peripheral scientific centres national contacts played an important role in establishing international collaborative links. Based on the results, we proposed recommendations for science policy focused on spurring scientific collaboration.
    Źródło:
    Zagadnienia Naukoznawstwa; 2017, 53, 3(213); 285-308
    0044-1619
    Pojawia się w:
    Zagadnienia Naukoznawstwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the proximity and skin effects on copper loss in a stator core
    Autorzy:
    Młot, A.
    Korkosz, M.
    Grodzki, P.
    Łukaniszyn, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141349.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    end winding
    copper loss
    iron loss
    ac loss
    skin effect
    proximity effect
    Opis:
    Accurate prediction of power loss distribution within an electrical device is highly desirable as it allows thermal behavior to be evaluated at the early design stage. Three-dimensional (3-D) and two-dimensional (2-D) finite element analysis (FEA) is applied to calculate dc and ac copper losses in the armature winding at high-frequency sinusoidal currents. The main goal of this paper is showing the end-winding effect on copper losses. Copper losses at high frequency are dominated by the skin and proximity effects. A time-varying current has a tendency to concentrate near the surfaces of conductors, and if the frequency is very high, the current is restricted to a very thin layer near the conductor surface. This phenomenon of nonuniform distribution of time-varying currents in conductors is known as the skin effect. The term proximity effect refers to the influence of alternating current in one conductor on the current distribution in another, nearby conductor. To evaluate the ac copper loss within the analyzed machine a simplified approach is adopted using one segment of stator core. To demonstrate an enhanced copper loss due to ac operation, the dc and ac resistances are calculated. The resistances ratio ac to dc is strongly dependent on frequency, temperature, shape of slot and size of slot opening.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 2; 211-225
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Instability Characteristics of Free-Standing Nanowires Based on the Strain Gradient Theory with the Consideration of Casimir Attraction and Surface Effects
    Autorzy:
    Sedighi, H. M.
    Ouakad, H. M.
    Khooran, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220374.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    free-standing cylindrical nanowire
    Casimir force
    proximity force approximation
    Dirichlet asymptotic approximation
    Opis:
    Size-dependent dynamic instability of cylindrical nanowires incorporating the effects of Casimir attraction and surface energy is presented in this research work. To develop the attractive intermolecular force between the nanowire and its substrate, the proximity force approximation (PFA) for small separations, and the Dirichlet asymptotic approximation for large separations with a cylinder-plate geometry are employed. A nonlinear governing equation of motion for free-standing nanowires – based on the Gurtin-Murdoch model – and a strain gradient elasticity theory are derived. To overcome the complexity of the nonlinear problem in hand, a Garlerkin-based projection procedure for construction of a reduced-order model is implemented as a way of discretization of the governing differential equation. The effects of length-scale parameter, surface energy and vacuum fluctuations on the dynamic instability threshold and adhesion of nanowires are examined. It is demonstrated that in the absence of any actuation, a nanowire might behave unstably, due to the Casimir induction force.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 3; 489-507
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculating the main and leakage inductance matrix of the 3-column 15-winding autotransformer
    Autorzy:
    Mazur, D.
    Gołębiowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141045.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    autotransformator
    indukcyjność rozproszenia
    straty wiroprądowe
    efekt zbliżenia
    autotransformer
    leakage inductance
    eddy current losses
    proximity effect
    Opis:
    The aim of this paper is presentation and comparison of calculation methods of the inductance matrix of a 3-column multi-winding autotransformer. Main and leakage autotransformer inductance was obtained using finite elements method. Static calculations were made at the current supply for 2D and 3D models, and mono-harmonic calculations were made at the voltage supply. In the mono-harmonic calculations the eddy current losses were taken into account, this made it possible to study relationship between the autotransformer parameters and the frequency. Calculations were made using Ansys and the authors' own programs in Matlab.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 3; 215-222
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement and calculation of 3-column 15-winding autotransformer
    Autorzy:
    Mazur, D.
    Gołębiowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141055.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    autotransformator
    indukcyjność rozproszenia
    straty wiroprądowe
    efekt zbliżenia
    autotransformer
    leakage inductance
    eddy current losses
    proximity effect
    Opis:
    The 15-winding and 3-column autotransformer supplying an 18-pulse rectifier circuit was developed. Presented methods can be used also for the autotransformers of other topologies supplying different kinds of converters. Presented methods make it possible to exactly calculate main and leakage inductances of the multi-winding autotransformer. The presented analysis of the eigenvalues and eigenvectors of the inductance matrix makes it possible to identify the influence nature of individual modes on the inductance matrix, and to compare the calculation results obtained using the presented methods. Frequency dependence of autotransformer parameters was shown. Also modes of the impedance matrix of the multi-winding autotransformer was investigated, this made it possible to identify the influence nature of individual modes on the inductance matrix. Using presented methods one can exactly calculate main and leakage inductances of the autotransformer. Thanks to this, one can design in optimal way autotransformers for supplying, for example, rectifier circuits, THD coefficients. The results of the measurements and simulations were also shortly presented at the end of the article.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 3; 223-230
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal analytical winding size optimization for different conductor shapes
    Autorzy:
    Wojda, R. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/140709.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Dowell’s equation
    Eddy currents
    FEM
    inductors
    optimization
    proximity effect
    skin effect
    thermal effects
    winding losses
    Opis:
    The aim of this paper is to derive an analytical equations for the temperature dependent optimum winding size of inductors conducting high frequency ac sinusoidal currents. Derived analytical equations are useful designing tool for research and development engineers because windings made of foil, square-wire, and solid-round-wire windings are considered. Temperature dependent Dowell’s equation for the ac-to-dc winding resistance ratio is given and approximated. Thermally dependent analytical equations for the optimum foil thickness, as well as valley thickness and diameter of the square-wire and solid-round-wire windings are derived from approximated thermally dependent ac-to-dc winding resistance ratios. Minimum winding ac resistance of the foil winding and local minimum of the winding ac resistance of the solid-round-wire winding are verified with Maxwell 3D Finite Element Method simulations.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 2; 197-214
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Foil Winding Resistance and Power Loss in Individual Layers of Inductors
    Autorzy:
    Kazimierczuk, M. K.
    Wojda, R. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/226776.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    eddy currents
    individual layer winding resistance
    inductors
    optimal foil thickness
    proximity effect
    skin effect
    winding power loss
    Opis:
    This paper presents an estimation of high-frequency winding resistance and power loss in individual inductor layers made of foil, taking into account the skin and proximity effects. Approximated equations for power loss in each layer are given and the optimal values of foil thickness for each layer are derived. It is shown that the winding resistance of individual layers significantly increases with the operating frequency and the layer number, counting from the center of an inductor. The winding resistance of each foil layer exhibits a minimum value at an optimal layer thickness. The total winding resistance increases with the total number of layers.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 3; 237-246
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Objectivization of Audio-Visual Correlation Analysis
    Autorzy:
    Kunka, B.
    Kostek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/177202.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sound perception
    sound source localization
    virtual sound source shifting
    bi-modal perception
    cross-modal perception
    image proximity effect
    ventriloquism effect
    visual attention
    perceptual illusion
    eye-gaze tracking
    Opis:
    Simultaneous perception of audio and visual stimuli often causes concealment or misrepresentation of information actually contained in these stimuli. Such effects are called the "image proximity effect" or the "ventriloquism effect" in the literature. Until recently, most research carried out to understand their nature was based on subjective assessments. The authors of this paper propose a methodology based on both subjective and objectively retrieved data. In this methodology, objective data reflect the screen areas that attract most attention. The data were collected and processed by an eye-gaze tracking system. To support the proposed methodology, two series of experiments were conducted – one with a commercial eye-gaze tracking system Tobii T60, and another with the Cyber-Eye system developed at the Multimedia Systems Department of the Gdańsk University of Technology. In most cases, the visual-auditory stimuli were presented using a 3D video. It was found that the eye-gaze tracking system did objectivize the results of experiments. Moreover, the tests revealed a strong correlation between the localization of a visual stimulus on which a participant’s gaze focused and the value of the "image proximity effect". It was also proved that gaze tracking may be useful in experiments which aim at evaluation of the proximity effect when presented visual stimuli are stereoscopic.
    Źródło:
    Archives of Acoustics; 2012, 37, 1; 63-72
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ‘The letters keep on coming, though I’m dead’: Paralogicisms in the poetry of Jan Zych
    „Przychodzą jeszcze listy do mnie umarłego”. Paralogizmy w twórczości Jana Zycha
    Autorzy:
    Wojda, Dorota
    Powiązania:
    https://bibliotekanauki.pl/articles/2088395.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    20th-century Polish literature
    Polish poetry after 1945
    paralogicisms
    imagery of distance and proximity
    literary labyrinths
    Jan Zych (1931–1995)
    J.L. Borges (1899–1986)
    Octavio Paz (1914–1998)
    Jan Zych
    paralogizmy
    poezja epistolarna
    labirynt literacki
    Opis:
    This article focuses on paralogical fi gures (amphibology, equivocation, hypallage and syllepsis) in the poems of Jan Zych. Paralogicisms are phrases in which the combination of logical and syntactical form produces an irresolvable semantic conundrum. The article is divided into three parts, each dealing with one aspect of Zych’s handling of the opposition of distance and proximity: air metaphors expressive of the channel of poetic speech; communication by post (letters); and images of the labyrinth. The paralogical fi gures are discussed in terms of their function as textual building-blocks, a mark of the author’s subjectivity, and an invitation for performative reading. In this way, Zych’s poems, in particular Labirynty (The Labyrinths) are reconstituted as literary performances, analogous to the labyrinthine prose of J. L. Borges and Octavio Paz.
    Źródło:
    Ruch Literacki; 2019, 1; 43-59
    0035-9602
    Pojawia się w:
    Ruch Literacki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extensions for Apple-Google exposure notification mechanism
    Autorzy:
    Bobowski, Adam
    Cichoń, Jacek
    Kutyłowski, Mirosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2086848.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    contact tracing
    exposure notification
    privacy
    verifiability
    temporary exposure key
    rolling proximity identifier
    diagnosis key
    data sketch
    Jaccard similarity
    śledzenie kontaktów
    prywatność
    powiadomienie o ekspozycji
    sprawdzalność
    klucz tymczasowej ekspozycji
    identyfikator zbliżeniowy toczący
    klucz diagnostyczny
    szkic danych
    podobieństwo Jaccarda
    Opis:
    We analyze the Google-Apple exposure notification mechanism designed by the Apple-Google consortium and deployed on a large number of Corona-warn apps. At the time of designing it, the most important issue was time-to-market and strict compliance with the privacy protection rules of GDPR. This resulted in a plain but elegant scheme with a high level of privacy protection. In this paper we go into details and propose some extensions of the original design addressing practical issues. Firstly, we point to the danger of a malicious cryptographic random number generator (CRNG) and resulting possibility of unrestricted user tracing. We propose an update that enables verification of unlinkability of pseudonymous identifiers directly by the user. Secondly, we show how to solve the problem of verifying the “same household” situation justifying exempts from distancing rules. We present a solution with MIN-sketches based on rolling proximity identifiers from the Apple-Google scheme. Thirdly, we examine the strategies for revealing temporary exposure keys. We have detected some unexpected phenomena regarding the number of keys for unbalanced binary trees of a small size. These observations may be used in case that the size of the lists of diagnosis keys has to be optimized.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 4; e137126, 1--9
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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