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    Wyświetlanie 1-14 z 14
    Tytuł:
    Structure equation as novel strategy for optimum reflector design
    Autorzy:
    Ou, Chung-Jen
    Powiązania:
    https://bibliotekanauki.pl/articles/174423.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    illumination design
    light-emitting diodes
    structure equation
    Opis:
    The optimal use of energy resources is the central dogma for green technology and bio-optics. Reflectors provide a simple and fundamental structure for energy transport from a light emitting diode (LED) chip, and an appropriately designed reflector can reduce the fabrication cost of secondary optics for the LED. This paper demonstrates the role of three proposed reflector geometric factors in the two performance metrics – uniformity and collected energy (power), for designing LED reflectors. Through canonical factor analysis, a linear structure equation for LED reflector is suggested, and the methodology for designing the optimal shape is discussed. In addition, a generalized factor and a synthesis response are proposed for a more comprehensive investigation of optical performance. Results indicate a key parameter for balancing the optical performance, and the effects of various parameters and the trade-offs are revealed.
    Źródło:
    Optica Applicata; 2020, 50, 1; 95-110
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and strength calculations of the tripod support structure for offshore power plant
    Autorzy:
    Dymarski, C.
    Dymarski, P.
    Żywicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/259944.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    offshore wind turbine
    support structure
    Morison equation
    FEM
    Opis:
    The support structure being the object of the analysis presented in the article is Tripod. According to the adopted assumptions, it is a foundation gravitationally set in the water region of 60 m in depth, not fixed to the seabed, which can be used for installing a 7MW wind turbine. Due to the lack of substantial information on designing and strength calculations of such types of structures in the world literature, authors have made an attempt to solve this problem within the framework of the abovementioned project. In the performed calculations all basic loads acting on the structure were taken into account, including: the self mass of the structure, the masses of the ballast, the tower and the turbine, as well as hydrostatic forces, and aero- and hydrodynamic forces acting on the entire object in extreme operating conditions.
    Źródło:
    Polish Maritime Research; 2015, 1; 36-46
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Force structure impact on the wheel module stability and oscillation process
    Vlijanie struktury sil na ustrojjchivost kolesnogo modulja i process avtokolebanijj
    Autorzy:
    Kravchenko, A.
    Verbitskiy, V.
    Khrebet, V.
    Velmagina, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/793532.pdf
    Data publikacji:
    2013
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    wheel module
    stability
    force structure
    oscillation
    oscillation amplitude
    equation
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2013, 13, 4
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Flat structure and potential vector fields related with algebraic solutions to Painleve VI equation
    Autorzy:
    Kato, M.
    Mano, T.
    Sekiguchi, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/254743.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    flat structure
    Painleve VI equation
    algebraic solution
    potential vector field
    Opis:
    A potential vector field is a solution of an extended WDVV equation which is a generalization of a WDVV equation. It is expected that potential vector fields corresponding to algebraic solutions of Painleve VI equation can be written by using polynomials or algebraic functions explicitly. The purpose of this paper is to construct potential vector fields corresponding to more than thirty non-equivalent algebraic solutions.
    Źródło:
    Opuscula Mathematica; 2018, 38, 2; 201-252
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Age Structure of Employment and Wages. An Analysis Across Occupational Groups
    Autorzy:
    Broniatowska, Paulina
    Majchrowska, Aleksandra
    Nasiński, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/2075460.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    employment structure
    workforce aging
    wages
    occupational groups
    Mincer-type wage equation
    Opis:
    Recently, in most developed economies, the average age of the workforce has been growing rapidly. Therefore, the questions arise how will it affect the level of wages and the shape of age-productivity and age-wage profiles. The aim of the paper is to analyse the relationship between changes in the age structure of the employment and wages of individuals in minor occupational groups. Using individual data from the Structure of Earnings Survey in Poland in 2006-2014 we created an unique database of individual wages and the characteristics of employed in occupational groups at 3-digit level of classification. In our analysis we used an extended version of Mincerian wage model where both the characteristics of employees (education, work tenure, age, gender, and type of employment contract) and employers (size and ownership sector) were taken into account. The results for the whole sample indicate a significant and negative relationship between the proportion of older workers in employment in a given occupational group and individual wages. However, when the analyses were performed separately for each of the 1-digit occupational groups, the results varied significantly. In those groups where knowledge and qualifications of employees are more important than physical strength had to be updated permanently, an increase in the number of the older workers raises the average wages
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2020, 3; 227-250
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Bolza optimal synthesis problem for singular estimate control systems
    Autorzy:
    Lasiecka, I.
    Tuffaha, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/970760.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    Bolza problem
    Riccati equation
    singular estimate control systems
    fluid-structure interaction
    Opis:
    Bolza problem governed by PDE control systems with unbounded controls is considered. The motivating example is fluid structure interaction model with boundary-interface controls. The aim of the work is to provide optimal feedback synthesis associated with well denned gain operator constructed from the Riccati equation. The dynamics considered is of mixed parabolic-hyperbolic type which prevents applicability of tools developed earlier for analytic semigroups. It is shown, however, that the control operator along with the generator of the semigroup under consideration satisfy singular estimate referred to as Revisited Singular Estimate (RSE). This estimate, which measures "unboundedness" of control actions, is a generalization and a weaker form of Singular Estimate (SE) treated in the past literature. The main result of the paper provides Riccati theory developed for this new class of control systems labeled as RSECS (Revisited Singular Estimate Control Systems). The important feature is that the gain operator, constructed via Riccati operator, is consistent with the optimal feedback synthesis. The gain operator, though unbounded, has a controlled algebraically singularity at the terminal point. This enables one to establish well-posedness of the Riccati solutions and of the optimal feedback representation. An application of the theoretical framework to boundary control of a fluid-structure interaction model is given.
    Źródło:
    Control and Cybernetics; 2009, 38, 4B; 1429-1460
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Probabilistic model of the chain-like structures translocation through the pore in membrane
    Autorzy:
    Bartłomiejczyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/122984.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    Fokker-Planck equation
    translocation of chain-like structure
    stochastic process
    beta Moyal probability distribution
    Opis:
    The paper is devoted to the analysis of the translocation of the chain-like structures (CLS) through the pore in membrane. It focuses on the so-called passage time and the principal aim is to propose a proper probabilistic model for its distribution. The article starts with some preliminary results concerning stochastic processes. Next, an approximate analytic solution of the considered problem that was received in literature is presented. It is known that the resulting probability distribution of the passage time manifests some important shortcomings. Thus it is important to find a reasonable alternative. It is argued here that the beta Moyal probability distribution can be a good candidate for approximation of the theoretical distribution in various interesting situations. In this paper, two different problems connected with CLS translocation are considered. For both problems the theoretical distributions are known from literature and in both situations the beta Moyal approximations turn out to be very satisfactory.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 4; 5-10
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of jack-up platform for 6 MW WIND TURBINE: parametric analysis based dimensioning of platform legs
    Autorzy:
    Dymarski, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/259732.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    support structure
    jack-up platform
    offshore wind turbine
    fatigue
    sea loads
    parametric study
    Morison equation
    Opis:
    The article presents the results of the research conducted within the framework of the project entitled WIND-TU-PLA (ERA-NET, MARTEC II), the general aim of which was to design and analyse supporting structures for wind turbines intended for operation on the South Baltic area. The research part described in the article aimed at developing a preliminary design for a jack-up platform which can operate on water areas with depth of 40 m. The main task was to determine optimal dimensions of platform legs and the radius of their spacing. Two jack-up platform concepts differing by spacing radius and hull dimensions were designed with the intention to be used as a supporting structure for a 6-MW offshore wind turbine. For each concept, the parametric analysis was performed to determine optimal dimensions of platform legs (diameter Dleg and plating thickness tleg). Relevant calculations were performed to assess the movements of the platform with parameters given in Table 1 in conditions simulating the action of the most violent storm in recent 50 years. The obtained results, having the form of amplitudes of selected physical quantities, are shown in comprehensive charts in Fig. 6 and 7. Based on the critical stress values (corresponding to the yield stress), the area was defined in which the impact strength conditions are satisfied (Fig. 14). Then, the fatigue strength analysis was performed for two selected critical leg nodes (Fig. 12). Its results were used for defining the acceptable area with respect to structure’s fatigue (Fig. 14). Geometric parameters were determined which meet the adopted criteria, Table 6. The decisive criterion turned out to be the fatigue strength criterion, while the yield point criterion appeared to be an inactive constraint.
    Źródło:
    Polish Maritime Research; 2019, 2; 183-197
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular dynamics simulation of copolymers
    Autorzy:
    Banaszak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964087.pdf
    Data publikacji:
    2001
    Wydawca:
    Politechnika Gdańska
    Tematy:
    molecular dynamics
    computer simulation
    copolymer
    diblock
    ionic copolymer
    diffusion
    structure factor
    equation of state
    thermodynamic properties
    Opis:
    A series of representative molecular dynamics simulations of model Lennard-Jones copolymer chains is presented. We report measurements of thermodynamic, structural and dynamic properties of our model copolymers. For neutral copolymers we confirm our version of thermodynamic perturbation theory of the first order, while for ionic copolymers we demonstrate microphase formation and the anisotropy of the counterion diffusion.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 1; 17-27
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical model of deformation of railway sleeper track structure with the step change of stiffness on the elastic winkler foundation of the constant stiffness
    Matematicheskaja model' deformacii rel'coshpal'nojj reshetki so stupenchatym izmeneniem zhestkosti na uprugom vinklerovom osnovanii postojannojj zhestkosti
    Autorzy:
    Slobodyanyuk, M.
    Nikitina, A.
    Nechayev, G.
    Rakovskaya, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/793557.pdf
    Data publikacji:
    2014
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    rolling stock
    railway
    stiffness
    railway sleeper track structure
    elastic foundation
    deformation
    deflection
    cross-section
    mathematical model
    equation
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 2
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efektywna podaż pracy a wzrost gospodarczy
    Effective Labor Supply and Economic Growth
    Autorzy:
    Florczak, Waldemar
    Powiązania:
    https://bibliotekanauki.pl/articles/574819.pdf
    Data publikacji:
    2008-12-31
    Wydawca:
    Szkoła Główna Handlowa w Warszawie. Kolegium Analiz Ekonomicznych
    Tematy:
    effective labor supply
    human capital
    econometric model
    Mincer wage equation
    sustained economic growth
    supply-side growth factors
    demographic structure of the population
    Opis:
    The article discusses the relationship between effective labor supply-determined by factors that are linked either directly or indirectly with human capital-and sustained economic growth per capita. On the basis of an expanded Mincer wage equation, the author estimates effective labor supply, taking into account effects linked with human capital, and conducts an econometric analysis of changes in the average working time in Poland in 1970-2005. The author zeroes in on long-term relationships and checks the results of his analysis against a body of statistical data. The diagnostic tools used by the author include the Gauss-Markov theorem, a method for evaluating statistical errors developed by mathematicians Carl Friedrich Gauss and Andrey Markov. According to Florczak, standard labor supply analyses are often inaccurate because they overlook factors linked with working time, the quality of labor, and the overall social and demographic conditions. In an era of globalization, the author says, if it wants to maintain its international economic competitiveness, Poland should increase the role of “extensive” factors of production by boosting the economic activity of the population.
    Źródło:
    Gospodarka Narodowa. The Polish Journal of Economics; 2008, 228, 11-12; 21-46
    2300-5238
    Pojawia się w:
    Gospodarka Narodowa. The Polish Journal of Economics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tracking control of a balancing robot – a model-based approach
    Sterowanie śledzące robota zachowującego równowagę – podejście oparte na modelu
    Autorzy:
    Zaiczek, T
    Franke, M
    Powiązania:
    https://bibliotekanauki.pl/articles/140122.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    single-axle mobile robot
    nonholonomic constraints
    Hamel's equation
    cascade control structure
    input-output linearization
    tracking control
    nonlinear control
    jednoosiowy robot mobilny
    równanie ruchu Hamela
    kontrola nieliniowa
    Opis:
    This paper presents a control concept for a single-axle mobile robot moving on the horizontal plane. A mathematical model of the nonholonomic mechanical system is derived using Hamel's equations of motion. Subsequently, a concept for a tracking controller is described in detail. This controller keeps the mobile robot on a given reference trajectory while maintaining it in an upright position. The control objective is reached by a cascade control structure. By an appropriate input transformation, we are able to utilize an input-output linearization of a subsystem. For the remaining dynamics a linear set-point control law is presented. Finally, the performance of the implemented control law is illustrated by simulation results.
    W artykule przedstawiono koncepcję sterowania ruchem jednoosiowego robota poruszającego się po płaszczyźnie poziomej. Model matematyczny nieholonomicznego systemu mechanicznego wyprowadzono korzystając z równań ruchu Hamela. Opisano następnie szczegółowo koncepcję sterownika śledzącego. Sterownik prowadzi poruszający się robot po zadanej trajektorii utrzymując go jednocześnie w pozycji pionowej. Cel sterowania jest osiągnięty przy zastosowaniu kaskadowej struktury sterowania. Dzięki odpowiedniej transformacji danych wejściowych, w podsystemie istnieje możliwość linearyzacji wejście-wyjście. Dla dynamiki pozostałej części zaprezentowano prawo liniowego sterowania stałowartościowego. Ostatecznie, jakość działania zastosowanych praw sterowania zilustrowano wynikami symulacji.
    Źródło:
    Archive of Mechanical Engineering; 2014, LXI, 2; 331-346
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stabilization of a fluid structure interaction with nonlinear damping
    Autorzy:
    Lasiecka, I.
    Lu, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/206598.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    fluid structure interaction
    interface
    Navier-Stokes equation
    system of elasticity
    feedback boundary control
    strong stability
    uniform stability
    optimal control
    passive damping
    active damping
    dynamic and static damping
    Opis:
    Asymptotic stability of finite energy solutions to a fluid-structure interaction with a static interface in a bounded domain Ω ∈ Rn, n = 2 is considered. It is shown that the undamped model subject to ”partial flatness” geometric condition on the in- terface produces solutions whose energy converges strongly to zero; while with a stress type feedback control applied on the interface of the structure, the model produces solutions whose energy is exponentially stable. An addition of a static damping on the interface produces solutions whose full norm in the phase space is exponentially stable. Without a static damping an interesting phenomenon occurs that steady state solutions (equilibria) might generate genuinely growing in time solutions. This is purely nonlinear phenomenon captured by newly developed techniques amenable to handle instability of steady state solutions arising from nonlinearity.
    Źródło:
    Control and Cybernetics; 2013, 42, 1; 155-181
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie rozkładu wartości osobliwych do analizy jakościowej kratownic i konstrukcji tensegrity
    Application of singular value decomposition for qualitative analysis of truss and tensegrity structures
    Autorzy:
    Gilewski, W.
    Klosowska, J.
    Obara, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/40352.pdf
    Data publikacji:
    2015
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    budownictwo
    uklady nosne
    kratownice
    kratownice plaskie
    kratownice przestrzenne
    tensegrity
    mechanika
    rownania macierzowe
    rozklad wartosci osobliwych
    building engineering
    load bearing system
    truss
    plane truss
    space truss
    tensegrity structure
    mechanics
    matrix equation
    singular value decomposition
    Opis:
    W pracy przedstawiono zastosowanie rozkładu wartości osobliwych (SVD) macierzy wydłużeń do analizy jakościowej kratownic oraz konstrukcji tensegrity. Rozkład taki pozwala na określenie mechanizmów infinitezymalnych oraz stanów samorównoważnych sił podłużnych konstrukcji. Znajomość takich stanów pozwala z kolei określić, czy rozważana kratownica znajduje się w konfiguracji tensegrity. Rozważania teoretyczne zilustrowano na przykładach.
    The present paper is dedicated to the application of singular value decomposition (SVD) of extension matrix to the qualitative analysis of truss and tensegrity structures. The decomposition allow to define infinitesimal mechanisms as well as self-stress states of the truss. It can help to recognize if the truss is in tensegrity configuration. Theoretical considerations are illustrated on several examples.
    Źródło:
    Acta Scientiarum Polonorum. Architectura; 2015, 14, 3
    1644-0633
    Pojawia się w:
    Acta Scientiarum Polonorum. Architectura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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