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Wyświetlanie 1-15 z 21
Tytuł:
Safe locker - a secure cargo transport control support IT system
Autorzy:
Anus, Artur
Buchwald, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/1954463.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska
Tematy:
GPGPU
PDE
Opis:
The article presents the assumptions and architectural implementation of a cargo transport control support system, as well as the preliminary results of tests of the operation of this system in environmental conditions identical with the conditions of natural operation.The aim of the article is the publication of the research results collected during the design, implementation and operation of the system, which relate to the proposed solutions for selected problems that emerged during the development of the system by the research and development team. The article also presents the completed development work and possibilities in the field of the system improvement due to security reasons through integration with modern data processing systems based on a block chain (Blockchain).
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2019, 23, 1; 19-28
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
GPU software and architecture comparison for numerical simulation of partial deferential equations
Autorzy:
May, Jon B.
Pera, Donato
Powiązania:
https://bibliotekanauki.pl/articles/1955286.pdf
Data publikacji:
2018
Wydawca:
Politechnika Gdańska
Tematy:
GPGPU
PDE
Opis:
This paper will show a comparison between the Kepler, Maxwell and Pascal GPU architectures using CUDA-Fortran, with and without dynamic calls, to efficiently solve partial differential equations. The target is to show the possibility of using affordable hardware, such astheGTX670,GTX970 andGTX1080 NVIDIA GPUs, which are commonly found in personal and portable computers, for scientific applications. For simplicity we consider a standard wave equation where we use a second order finite difference method for the spatial and time discretizations to obtain the numerical solution. We found that, as we increase the spatialre solution of the domain we also increase the performance difference between the GPU and the Central Processing Unit (CPU).
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2018, 22, 1; 85-100
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detonation engines
Autorzy:
Wolański, P.
Powiązania:
https://bibliotekanauki.pl/articles/950134.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
detonation engines
detonation
PDE
RDE
Opis:
In this paper survey of jet engines based on detonation combustion is provided. After short historical view, basic schemes of engines utilizing detonation are described. Possible improvement of propulsion efficiency due to detonative combustion which results in pressure increase is presented and comparison of deflagrative and detonative combustion is discussed. Detailed description of Pulsed Detonation Engines (PDE) as well as Rotating Detonation Engines (RDE) is given. Also basic principle of engine utilizing Standing Detonation is provided. Special attention is given to RDE, since rotating detonation can be applied to all kind of jet engines including, turbine, ramjet and rocket engines. Basic research of rotating detonation in cylindrical chambers for hydrogen-air mixtures is presented. A typical pressure record for experiments carried out in laboratory conditions is given. Schematic diagrams of turbofan engines are compared to classical ones and advantages and disadvantages of application of rotating detonation to these engines is discussed. For ramjet engines, schematic diagram of engine operation is depictured. Special attention is given to the rocket engines utilizing rotating detonation. Experimental research of small models of rockets engines with aerospike nozzle is presented. Test of such engines were carried out for gaseous fuels, such as: hydrogen, methane, ethane and propane with gaseous oxygen. Measurements of pressure and thrust are presented. Finally, possible configuration and applications of combine cycle rocket-ramjet engine utilizing rotating detonation is discussed.
Źródło:
Journal of KONES; 2011, 18, 3; 515-521
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The well-posedness of a swimming model in the 3-D incompressible fluid governed by the nonstationary Stokes equation
Autorzy:
Khapalov, A.
Powiązania:
https://bibliotekanauki.pl/articles/330536.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
swimming model
coupled PDE/ODE system
nonstationary Stokes equation
sprzężony system PDE/ODE
równanie Stokesa
Opis:
We introduce and investigate the well-posedness of a model describing the self-propelled motion of a small abstract swimmer in the 3-D incompressible fluid governed by the nonstationary Stokes equation, typically associated with low Reynolds numbers. It is assumed that the swimmer’s body consists of finitely many subsequently connected parts, identified with the fluid they occupy, linked by rotational and elastic Hooke forces. Models like this are of interest in biological and engineering applications dealing with the study and design of propulsion systems in fluids.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2013, 23, 2; 277-290
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Addendum to “The well-posedness of a swimming model in the 3-D incompressible fluid governed by the nonstationary Stokes equation”
Autorzy:
Khapalov, A.
Powiązania:
https://bibliotekanauki.pl/articles/330456.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
swimming model
coupled PDE/ODE system
nonstationary Stokes equation
sprzężony system PDE/ODE
równanie Stokesa
Opis:
In this addendum we address some unintentional omission in the description of the swimming model in our recent paper (Khapalov, 2013).
Źródło:
International Journal of Applied Mathematics and Computer Science; 2013, 23, 4; 905-906
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic projection operator method in the theory of hyperbolic systems of partial differential equations with variable coefficients
Autorzy:
Leble, S.
Vereshchagina, I.
Powiązania:
https://bibliotekanauki.pl/articles/1940707.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska
Tematy:
hyperbolic PDE
idempotents
inhomogeneous media
acoustics
Opis:
We consider a generalization of the projection operator method for the case of the Cauchy problem in 1D space for systems of evolution differential equations of first order with variable coefficients. It is supposed that the dependence of coefficients on the only variable χ is weak, that is described by the introduction of a small parameter. Such problem corresponds, for example, to the case of wave propagation in a weakly inhomogeneous medium. As an example, we specify the problem to adiabatic acoustics in waveguides with a variable cross-section. Projection operators are constructed for the Cauchy problem to fix unidirectional modes. The method of successive approximations (perturbation theory) is developed and based on the pseudodifferential operators theory. The application of projection operators adapted for the case under consideration allows deriving approximate evolution equations corresponding to the separated directed waves.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2017, 21, 2; 109-120
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Combination therapy of tadalafil and pentoxifylline in severe erectile dysfunction; a prospective randomized trial
Autorzy:
Kumar, Santosh
Roat, Rajesh
Agrawal, Swat
Jayant, Kumar
Mavuduru, Ravimohan
Kumar, Shrawan
Powiązania:
https://bibliotekanauki.pl/articles/1394362.pdf
Data publikacji:
2015
Wydawca:
Index Copernicus International
Tematy:
erectile dysfunction
PDE5 inhibitors
Tadalafil
Pentoxyfilline
Opis:
The aim of the study was to assess efficacy of Tadalafil alone versus Tadalafil plus Pentoxifylline in the treatment of erectile dysfunction by using self administered IIEF-5 questionnaire. Material and methods. Two hundred and thirty seven patients presenting with ED at andrology OPD were evaluated for ED by a self administered IIEF (International Index of Erectile Function) questionnaire. Patients were systematically randomized by computer generated random table into two groups groups namely, group A: Tadalafil only group, group B: combination of Tadalafil + Pentoxifylline. All the patients were re-assessed by IIEF-5 questionnaire after 8 weeks of medical therapy. Statistical analysis was performed using student’s unpaired t-test, paired t-test, chi square test. pvalue < 0.05 was considered statistically significant. Results. Two hundred and thirty seven patients were included in the present study, in group A: 92 patients (78.6%) showed improvement in their IIEF score after 8 weeks of tadalafil treatment. While in group B, overall 104 patients(86.6%) showed improvement after combination of Tadalafil and Pentoxifylline. There was a statistically significant difference of percentage change in IIEF score was seen in group B (group A 90.7±15.2%, group B 95.6±13.4%; p value – 0.014). We found this difference even more statistically significant in patients with severe ED (group A 72.7±47.2%, group B 132.3±54.3%; p value – 0.000). There was no significant difference in between the two groups with regards to occurrence of side effects. Conclusions. Both tadalafil and combination of Tadalafil + Pentoxifylline improve erectile function in patients of ED. Patients with severe ED showed much significant improvement in erectile function with combination therapy.
Źródło:
Polish Journal of Surgery; 2015, 87, 8; 377-383
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PDE4 inhibitors have no effect on eotaxin expression in human primary bronchial epithelial cells
Autorzy:
Paplińska-Goryca, Magdalena
Chazan, Ryszarda
Grubek-Jaworska, Hanna
Powiązania:
https://bibliotekanauki.pl/articles/1039713.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
PDE4 inhibitors
primary bronchial epithelial cells
eotaxins
Opis:
The bronchial epithelium is a very important factor during the inflammatory response, it produces many key regulators involved in the pathophysiology of asthma and COPD. Local influx of eosinophils, basophils, Th2 lymphocytes and macrophages is the source of many cytotoxic proteins, cytokines and other mediators of inflammation. These cells are attracted by eotaxins (eotaxin-1/CCL11, eotaxin-2/CCL24, eotaxin-3/CCL26). Inhibitors of phosphodiesterase 4 (PDE4) are new anti-inflammatory drugs which cause cAMP accumulation in the cell and inhibit numerous stages of allergic inflammation. The aim of our study was to evaluate the influence of PDE4 inhibitors: rolipram and RO-20-1724 on the expression of eotaxins in human primary bronchial epithelial cells. Cells were preincubated with PDE4 inhibitors for 1 hour and then stimulated with IL-4 or IL-13 alone or in combination with TNF-α. After 48 hours, eotaxin protein level was measured by ELISA and mRNA level by real time PCR. These cells produce CCL24 and CCL26. PDE4 inhibitors increased CCL24 and CCL26 mRNA level irrespectively of the used stimulators. Rolipram and RO-20-1724 had no effect on eotaxin protein production in our experimental conditions. Thus PDE4 inhibitors have no effect on eotaxin protein expression in human primary bronchial epithelial cells. In vitro experiments should be performed using a primary cell model rather than immortalized lines.
Źródło:
Acta Biochimica Polonica; 2012, 59, 3; 371-375
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sufficient conditions for unique global solutions in optimal control of semilinear equations with C1 nonlinearity
Autorzy:
Ahmad Ali, Ahmad
Deckelnick, Klaus
Hinze, Michael
Powiązania:
https://bibliotekanauki.pl/articles/1839143.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal control
semilinear PDE
uniqueness of global solutions
Opis:
We consider a semilinear elliptic optimal control problem possibly subject to control and/or state constraints. Generalizing previous work, presented in Ahmad Ali, Deckelnick and Hinze (2016) we provide a condition which guarantees that a solution of the necessary first order conditions is a global minimum. A similiar result also holds at the discrete level where the corresponding condition can be evaluated explicitly. Our investigations are motivated by G¨unter Leugering, who raised the question whether the problem class considered in Ahmad Ali, Deckelnick and Hinze (2016) can be extended to the nonlinearity φ(s) = s|s|. We develop a corresponding analysis and present several numerical test examples demonstrating its usefulness in practice.
Źródło:
Control and Cybernetics; 2019, 48, 2; 325-344
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trust region methods with hierarchical finite element models for PDE-constrained optimization
Autorzy:
Kirchner, A.
Meidner, D.
Vexler, D.
Powiązania:
https://bibliotekanauki.pl/articles/206108.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
trust region
model hierarchy
finite elements
PDE-constrained optimization
Opis:
In this paper, a Hierarchical Trust Region Algorithm for solving PDE-constrained optimization problems is developed. A hierarchy of finite element meshes is used to define a hierarchy of quadratic models for the approximation of the discrete reduced cost functional on the finest mesh. The proposed algorithm simultaneously controls the choice of the model and the size of the trust region radius. Application of the trust region convergence theory allows for proving that every accumulation point of the sequence produced by the algorithm is a stationary point of the discretized problem. Numerical examples illustrate the behavior of the method and show a considerable reduction of computation time compared to the standard Newton trust region scheme.
Źródło:
Control and Cybernetics; 2011, 40, 4; 1019-1042
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of projection and penalty methods for discretized elliptic control problems
Autorzy:
Cegielski, Andrzej
Grossmann, Christian
Powiązania:
https://bibliotekanauki.pl/articles/729435.pdf
Data publikacji:
2007
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
convex programming
control of PDE
projection methods
penalty methods
Opis:
In this paper, properties of projection and penalty methods are studied in connection with control problems and their discretizations. In particular, the convergence of an interior-exterior penalty method applied to simple state constraints as well as the contraction behavior of projection mappings are analyzed. In this study, the focus is on the application of these methods to discretized control problem.
Źródło:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization; 2007, 27, 1; 23-41
1509-9407
Pojawia się w:
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The d-bar formalism for the modified Veselov-Novikov equation on the half-plane
Autorzy:
Hwang, Guenbo
Moon, Byungsoo
Powiązania:
https://bibliotekanauki.pl/articles/2048897.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
initial-boundary value
integrable nonlinear PDE
spectral analysis
d-bar
Opis:
We study the modified Veselov–Novikov equation (mVN) posed on the half-plane via the Fokas method, considered as an extension of the inverse scattering transform for boundary value problems. The mVN equation is one of the most natural (2+1)-dimensional generalization of the (1+1)-dimensional modified Korteweg-de Vries equation in the sense as to how the Novikov–Veselov equation is related to the Korteweg–de Vries equation. In this paper, by means of the Fokas method, we present the so-called global relation for the mVN equation, which is an algebraic equation coupled with the spectral functions, and the d-bar formalism, also known as Pompieu’s formula. In addition, we characterize the d-bar derivatives and the relevant jumps across certain domains of the complex plane in terms of the spectral functions.
Źródło:
Opuscula Mathematica; 2022, 42, 2; 179-217
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nonoverlapping domain decomposition for optimal control problems governed by semilinear models for gas flow in networks
Autorzy:
Leugering, G.
Martin, A.
Schmidt, M.
Sirvent, M.
Powiązania:
https://bibliotekanauki.pl/articles/205527.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
optimal control
gas networks
Euler equation
semilinear PDE
nonoverlapping domain decomposition
Opis:
We consider optimal control problems for gas flow in pipeline networks. The equations of motion are taken to be represented by a first-order system of hyperbolic semilinear equations derived from the fully nonlinear isothermal Euler gas equations. We formulate an optimal control problem on a network and introduce a tailored time discretization thereof. In order to further reduce the complexity, we consider an instantaneous control strategy. The main part of the paper is concerned with a nonoverlapping domain decomposition of the optimal control problem on the graph into local problems on smaller sub-graphs—ultimately on single edges. We prove convergence of the domain decomposition method on networks and study the wellposedness of the corresponding time-discrete optimal control problems. The point of the paper is that we establish virtual control problems on the decomposed subgraphs such that the corresponding optimality systems are in fact equal to the systems obtained via the domain decomposition of the entire optimality system.
Źródło:
Control and Cybernetics; 2017, 46, 3; 191-225
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bayesian approach to parameter identification in gas networks
Autorzy:
Hajian, Soheil
Hintermüller, Michael
Schillings, Claudia
Strogies, Nikolai
Powiązania:
https://bibliotekanauki.pl/articles/1839142.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
Bayesian inversion
distributed friction coefficient
gas network/pipeline
hyperbolic PDE system
Opis:
The inverse problem of identifying the friction coefficient in an isothermal semilinear Euler system is considered. Adopting a Bayesian approach, the goal is to identify the distribution of the quantity of interest based on a finite number of noisy measurements of the pressure at the boundaries of the domain. First wellposedness of the underlying non-linear PDE system is shown using semigroup theory, and then Lipschitz continuity of the solution operator with respect to the friction coefficient is established. Based on the Lipschitz property, well-posedness of the resulting Bayesian inverse problem for the identification of the friction coefficient is inferred. Numerical tests for scalar and distributed parameters are performed to validate the theoretical results.
Źródło:
Control and Cybernetics; 2019, 48, 2; 377-402
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The interaction between PDE and graphs in multiscale modeling
Autorzy:
Morales, F. A.
Alvares, S.N.
Powiązania:
https://bibliotekanauki.pl/articles/254867.pdf
Data publikacji:
2017
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
coupled PDE systems
mixed formulations
porous media
analytic graph theory
complex networks
Opis:
In this article an upscaling model is presented for complex networks with highly clustered regions exchanging/trading quantities of interest at both, microscale and macroscale level. Such an intricate system is approximated by a partitioned open map in R2 or R3. The behavior of the quantities is modeled as flowing in the map constructed and thus it is subject to be described using partial differential equations. We follow this approach using the Darcy Porous Media, saturated fluid flow model in mixed variational formulation.
Źródło:
Opuscula Mathematica; 2017, 37, 2; 327-345
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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