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Wyszukujesz frazę "Phenomenon" wg kryterium: Temat


Tytuł:
Problems with the classification and prediction of extreme weather phenomena
Autorzy:
Warakomski, W.
Powiązania:
https://bibliotekanauki.pl/articles/25927.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
classification
prediction
weather phenomenon
extreme weather phenomenon
Źródło:
International Agrophysics; 1998, 12, 4
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Analysis of Jump and Bifurcation Phenomena in a Forced Vibration of Geometrical Nonlinear Cantilever Beam: Application of Differential Transformation Method
Autorzy:
Sobamowo, M. G.
Yinusa, A. A.
Adeleye, O. A.
Oyelade, A. O.
Sadiq, O. M.
Powiązania:
https://bibliotekanauki.pl/articles/1031911.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Bifurcation Phenomenon
Differential transformation method
Jump phenomenon
Nonlinear vibration
Phase plane
Opis:
One of the classical features exhibited in nonlinear dynamics of engineering systems is the jump phenomenon, which is the discontinuous change in the steady state response of a system as a parameter is slowly varied. Such phenomenon is characterized by large amplitude dynamic responses of systems to small amplitude disturbances. It is established that this phenomenon cannot be described by the standard asymptotic and perturbation methods because they are limited to the study of small amplitude responses to small disturbances. Therefore, this paper presents the application of differential transformation method-Padé approximant to the solution of jump and bifurcation phenomena for a geometrical nonlinear cantilever beam subjected to a harmonic excitation. The accuracy and validity of the analytical solutions obtained by the differential transformation method are shown through a comparison of the results of the analytical solution with the corresponding results of the numerical solution obtained by fourth-order Runge-Kutta method and also with the results in a past study using harmonic balancing method. With the aid of the differential transformation method-Padé approximant, the effects of the nonlinear parameters in the model equation on the dynamic response of the beam are investigated. Also, the sensitivity of the beam to the external excitation amplitude is analyzed. In the distributed forced vibration, the jump phenomenon appeared in the response amplitude by variation of the excitation frequency while in the resonance frequency, the beat phenomenon with harmonic motion is seen for low level of excitation amplitude. At a certain frequency, the jump and bifurcation phenomena are seen in the curves of responses versus excitation amplitude. Additionally, the plots of the phase plane and time history of the system response are shown. It is established that the differential transformation method is a very useful mathematical tool for dealing with the nonlinear problems.
Źródło:
World Scientific News; 2020, 140; 26-58
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Directional change and windup phenomena in LQR-controlled systems with actuator failure
Autorzy:
Horla, D.
Powiązania:
https://bibliotekanauki.pl/articles/141455.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
directional change
windup phenomenon
actuator failure
Opis:
The paper presents a phenomenon of directional change in the case of a LQR controller applied to multivariable plants with amplitude and rate constraints imposed on the control vector, as well as the impact of the latter on control performance, with the indirect observation of the windup phenomenon effect via frequency of consecutive resaturations. The interplay of directional change of the computed control vector with control performance has been thoroughly investigated, and it is a result of the presence of constraints imposed on the applied control vector for different ratios of the number of control inputs to plant outputs. The impact of the directional change phenomenon on the control performance (and also on the windup phenomenon) has been defined, stating that performance deterioration is not tightly coupled with preservation of direction of the computed control vector. This conjecture has been supported by numerous simulation results for different types of plants with different LQR controller parameters.
Źródło:
Archives of Electrical Engineering; 2018, 67, 2; 345--359
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Two-dimensional stable Lavrentiev phenomenon with and without boundary conditions
Autorzy:
Caetano, A.
Sarychev, A.
Seabra, D.
Powiązania:
https://bibliotekanauki.pl/articles/970549.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
multidimensional calculus of variations
Lavrentiev phenomenon
Opis:
This work contains examples of regular 2D problems of the Calculus of Variations which exhibit stable Lavrentiev phenomenon, under different types of boundary conditions.
Źródło:
Control and Cybernetics; 2005, 34, 3; 689-707
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Use of Modern Technology for Adapting the Tourist Areas Affected by the Mining Exploitations
Wykorzystanie nowoczesnych technologii w celu adaptacji terenów turystycznych dotkniętych eksploatacją wydobywczą
Autorzy:
Herbei, R. C.
Herbei, M. V.
Matei, A.
Moraru, R. I.
Powiązania:
https://bibliotekanauki.pl/articles/317883.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
monitoring
subsidence phenomenon
deformation
zjawisko osiadania
deformacja
Opis:
Monitoring of subsidence phenomenon is an activity that only topographer makes in order to follow the surface movement which cover the surface of the underground mining. The Jiul Valley is a region in which on approximately 53 km were 17 mining perimeters. By preserving some of them and continued exploitation in others, we have to pursuit this phenomenon permanently, because deformation continue even if the mines were closed. A solution for this problem can be the implementation of tourism development and construction that would not be affected by the subsidence phenomenon. The exploitation of underground deposits of useful minerals, create goals, solid state voltage change, causing a change in the balance of tensions surrounding rock. Rebalancing stress causes a series of movements that are felt to the surface area. The study of these influences is necessary to highlight and take appropriate measures for the protection of buildings and underground water that may flood. Findings can be also used in space weather influence surface mined underground in mining basins similar to those already studied. Application of modern technology to research the phenomenon of displacement and deformation of the terrain under the influence of groundwater exploitation leads to good results and a better understanding of the phenomenon. Monitoring of subsidence is a very important activity that takes place both during the mining of the deposit and in case of closure or groundwater conservation. Development of a region involves large investments and can be correlated and integrated tourism by components of the local economy , as long as it takes into account the following aspects, namely that these investments do not affect the future and does not endanger the resource pool it holds.
Obserwacja zjawiska osiadania jest aktywnością, którą topograf wykonuje w celu zaobserwowania ruchów powierzchni, która pokrywa powierzchnię kopalni podziemnych. Dolina Jiul jest regionem, w którym na w przybliżeniu 53 km znajdowało się 17 obwodów górniczych. Zabezpieczając niektóre z nich i kontynuując eksploatację w innych, musimy stale podążać za tym zjawiskiem, ponieważ deformacja jest kontynuowana nawet jeśli kopalnie zostały zamknięte. Rozwiązaniem tego problemu może być implementacja rozwoju turystyki i budownictwa, które nie byłoby zagrożone zjawiskiem osiadania. Wykorzystanie podziemnych złóż użytecznych materiałów, stawianie celów, zmiana napięcia ciał stałych, powoduje zmianę równowagi naprężenia otaczających skał. Naprężenia związane z przywróceniem równowagi powodują serię ruchów, które odczuwalne są na powierzchni. Badanie tych wpływów jest niezbędne aby naświetlić i wybrać odpowiednie środki ochrony budynków i wód podziemnych, które mogą wylać. Uzyskane dane mogą również zostać użyte w obszarze atmosfery górniczej, która wpływa na wydobycie podziemne w zagłębiach górniczych podobnych, do tych, które były do tej pory zbadane. Zastosowanie nowoczesnych technologii w badaniu zjawiska przemieszczenia i deformacji tereny pod wpływem eksploatacji wód gruntowych, prowadzi do uzyskania dobrych wyników i lepszego zrozumienia tego zjawiska. Monitorowanie osiadania jest bardzo ważną aktywnością, która ma miejsce zarówno podczas wydobycia depozytu jak również w przypadku zamknięcia lub konserwacji wód gruntowych. Rozwój regionu pociąga za sobą duże inwestycje i może być skorelowany i zintegrowany z rozwojem turystyki z częściami lokalnej gospodarki, tak długo jak brane są pod uwagę następujące aspekty, mianowicie, że te inwestycje nie mają wpływu na przyszłość i nie zagrażają puli zasobów, która je utrzymuje.
Źródło:
Inżynieria Mineralna; 2014, R. 15, nr 2, 2; 175-180
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Edmund Husserl’s Semantics and the Critical Theses of Late Structuralism
Autorzy:
Gołębiewska, Maria
Powiązania:
https://bibliotekanauki.pl/articles/451273.pdf
Data publikacji:
2019-04-30
Wydawca:
Uniwersytet Warszawski. Wydział Filozofii
Tematy:
phenomenon
language
essence
sign
meaning
sense
structure
Opis:
The article contains a review of the main arguments proposed by the philosophers of late structuralism (including the so-called post-structuralism) against Edmund Husserl’s phenomenology, particularly, his theses on semantics. Polemics against the Husserlian conception of semantics are grounded in the structuralists’ opposition to the various theses of Husserl’s phenomenologies (both the transcendental constitutive and the genetic). Initially (particularly in the 1950s), it was an attempt at combining the logical and linguistic theses of Husserlian phenomenology with the structuralist theses proposed by Ferdinand de Saussure, as known from late works by Maurice Merleau-Ponty. In the 1960s, it was an attempt at challenging the status of subjectivity – the subject, including the transcendental ego and the role of consciousness. Simultaneously, it is a polemic against essentialism, in regard to ontological, epistemological and anthropological theses. In the article, I focus on the polemics of the thinkers (i.a. Gilles Deleuze, Jacques Derrida, Jean-François Lyotard) that reformulated Saussure’s theses, against Husserlian semantics which they considered in reference to the broad understanding of a sign, exceeding the sign of language.
Źródło:
Eidos. A Journal for Philosophy of Culture; 2019, 3, 1(7); 30-50
2544-302X
Pojawia się w:
Eidos. A Journal for Philosophy of Culture
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The phenomenon of translatability in the Europeanization of the Law
Autorzy:
Olldashi, Enkeleda
Powiązania:
https://bibliotekanauki.pl/articles/1036085.pdf
Data publikacji:
2013
Wydawca:
Academicus. International Scientific Journal publishing house
Tematy:
legal system
legal family
translatability’s phenomenon
Opis:
The integration of legal systems in European is one of the most important issues. This process has started by the fact that there are significant differences between the civil law and common law system and between the legal families in it. A law (at domestic or international level) should not be viewed against the backdrop of the historical, political, cultural, social and economic context in which they function. In order to shed further light for our readers, we analyze by emphasizing the significant differences between the civil law and common law system on one side and the legal families that are part of the same legal system, either “Civil” or “Common,” on the other side. The Europeanization of law refers to the communization of the law by EU institutions and to a process that aims at creating a common Europe legal system. In the end, either in medium or long term, the Europeanization is contributing to the so-called non-mandatory or soft harmonization of private law. It is in the best interest of the EU to seek adequate judicial instruments to accommodate the massive numbers of laws deriving from different Civil Law and the Common law systems.
Źródło:
Academicus International Scientific Journal; 2013, 07; 19-26
2079-3715
2309-1088
Pojawia się w:
Academicus International Scientific Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aerodynamic Phenomena Caused by the Passage of a Train. Part 1: Pressure Interaction With Objects
Autorzy:
Zbieć, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2091311.pdf
Data publikacji:
2021
Wydawca:
Instytut Kolejnictwa
Tematy:
rolling stock
high-speed railways
aerodynamic phenomenon
Opis:
The series of articles describing aerodynamic phenomena caused by train passage characterise the interaction of a train travelling at high speed with the moving train itself, on other trains, on trackside objects and on people. This interaction can be of two types – generated pressure and slipstream. Apart from the literature analysis, the author’s research was also taken into account. The first part presents the general classification of aerodynamic phenomena, the pressure change waveform in open space caused by the passage of a train and the pressure interaction with trackside objects. Conclusions are presented on the construction of a high-speed rail vehicle and the strength and location of structures on high-speed lines.
Źródło:
Problemy Kolejnictwa; 2021, 191; 103--112
0552-2145
2544-9451
Pojawia się w:
Problemy Kolejnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molluscs as technical models
Autorzy:
Samek, A.
Powiązania:
https://bibliotekanauki.pl/articles/83907.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
mollusc
technical model
animal morphology
unusual structure
phenomenon
Źródło:
Folia Malacologica; 2012, 20, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical analysis of stick-slip suppression with the use of longitudinal tangential vibration
Autorzy:
Rybkiewicz, Marta
Gutowski, Paweł
Leus, Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/2055033.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
stick-slip phenomenon
longitudinal tangential vibrations
LuGre model
Opis:
The results of experimental tests and numerical simulation analyses of the possibility of partial reduction or entire elimination the stick-slip phenomenon in sliding motion through introduction of longitudinal tangential vibrations to the contact zone of a shifted body and the substrate are shown in the paper. The experimental tests were carried out on a specially designed stand. In the computational model, the dynamic equation of motion of the shifted body was used, and for the friction force description the LuGre model was adopted. A excellent consistency of the experimentally determined results with those calculated with the use of the developed model is obtained.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 637--648
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A non-singular description of parametrical resonance
Autorzy:
Romanów, F.
Hańćkowiak, J.
Powiązania:
https://bibliotekanauki.pl/articles/279246.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
stability
infinite chain of equations
truncation
Gibbs phenomenon
Opis:
Employing the Mathieu equations we present a method for construction of Ince-Strutt diagrams, in which no cut-off of the infinite chain of equations for Fourier coefficients is necessary.
Niesingularny opis rezonansu parametrycznego. Na przykładzie równania Mathieu przedstawiamy niesingularną metodę konstrukcji diagramów Incea-Strutta, które obrazują na płaszczyźnie F parametrów równania obszary stabilności i niestabilności. Niesingularność metody została osiągnięta dzięki nie obrywaniu nieskończonych łańcuchów równań dla współczynników Fouriera. Pozwala to na zachowanie pierwotnego charakteru rozważanych równań (zagadnienie początkowe). Przedstawione rozważania sugerują poszerzenie oszarów niestabilności.
Źródło:
Journal of Theoretical and Applied Mechanics; 2000, 38, 4; 879-892
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eutectic Structures Competition in the Stripes Strengthening the (Zn) – Single Crystal
Autorzy:
Wołczyński, W.
Kjelstrup, S.
Bedeaux, D.
Szajnar, J.
Billia, B.
Powiązania:
https://bibliotekanauki.pl/articles/380972.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
eutectic structure selection
Zn
single crystal
branching phenomenon
Opis:
Some eutectic stripes have been generated in a hexagonal (Zn) - single crystal. The stripes are situated periodically with the constant inter stripes spacing. The eutectic structure in the stripes consists of strengthening inter-metallic compound, Zn16Ti, and (Zn) – solid solution. The rod-like irregular eutectic structure (with branches) appears at low growth rates. The regular lamellar eutectic structure is observed at middle growth rates. The regular rod-like eutectic structure exists exclusively in the stripes at some elevated growth rates. A new thermodynamic criterion is recommended. It suggests that this eutectic regular structure is the winner in a morphological competition for which the minimum entropy production is lower. A competition between the regular rod-like and the regular lamellar eutectic growth is described by means of the proposed criterion. The formation of branches within irregular eutectic structure is referred to the state of marginal stability. A continuous transitions from the marginal stability to the stationary state are confirmed by the continuous transformations of the irregular eutectic structure into the regular one.
Źródło:
Archives of Foundry Engineering; 2014, 14, 4; 95-102
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental investigations of elimination the stick-slip phenomenon in the presence of longitudinal tangential vibration
Autorzy:
Leus, Mariusz
Abrahamowicz, Marta
Powiązania:
https://bibliotekanauki.pl/articles/386857.pdf
Data publikacji:
2019
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
stick-slip phenomenon
drive force
longitudinal tangential vibrations
Opis:
The article presents a scheme and description of the test stand as well as selected experimental results of the influence of longitudinal tangential vibrations on the stick-slip phenomenon. The tests were carried out at a constant forced vibration frequency f = 2000 Hz, as a function of the amplitude of the vibration velocity va. The position of the sliding body and the drive force necessary to make the body slip and maintain this motion were measured. The measurements were made in two successive stages. In the first stage, when the substrate on which the sliding occurred was stationary. In the second one, the substrate is in a vibrating motion in the direction parallel to the slip. The conducted experimental analyses have shown that longitudinal tangential vibrations can contribute to the reduction or even complete elimination of the stick-slip phenomenon.
Źródło:
Acta Mechanica et Automatica; 2019, 13, 1; 45-50
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Directional change in multivariable LQG control with actuator failure
Autorzy:
Horla, D.
Powiązania:
https://bibliotekanauki.pl/articles/199944.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
directional change
actuator failure
windup phenomenon
LQG
siłownik
Opis:
The paper presents the phenomenon of directional change in LQG control of multivariable systems with amplitude constraints, as well as the impact of the latter on control performance. The interplay of directional change of the computed control vector with control performance has been thoroughly investigated, and is a result of the presence of constraints imposed on the applied control vector for different proportions of the number of control inputs to plant outputs. The impact of directional change phenomenon on the control performance has been defined, stating that performance deterioration is not tightly coupled with preservation of direction of the computed control vector. The statement has been supported by numerous simulation results for different types of plants with different LQG controller parameters.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 4; 419-428
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Testing of Technical Fabrics under Fast Camera Control
Autorzy:
Kłosowski, Paweł
Michałowska, Krystyna
Przyborski, Marek
Jurczak, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/2201881.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
textile fabric
strength tests
rapid phenomenon
fast camera
Opis:
The dynamic development of measurement and recording techniques has been changing the way one conceives material strength. In this study, two different methods of evaluating the strength of fabrics are compared. The first is the typical and commonly used technique based on the use of a testing machine. The second method uses the so-called “fast camera” to monitor the entire process of the destruction of a fabric sample and analyse the behaviour of the fabric during the experiment. Both methods provide interesting data and present a very specific way of experimentally evaluating the strength of fabrics.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 1; 332--334
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł

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