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    Wyświetlanie 1-13 z 13
    Tytuł:
    About special properties of the hidden structure of triangular numbers for immediate factorization
    Autorzy:
    Samojluk, Artur
    Powiązania:
    https://bibliotekanauki.pl/articles/2133934.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    factorization algorithm
    RSA
    cryptography
    numerical experiments
    triangular numbers
    number theory
    Opis:
    The factorization problem belongs to a group of problems important in the security of information systems and cryptography. The article describes a new number factorization algorithm designed based on numerical experiments. We present an extension of number factorization using triangular numbers features. The described algorithm can be used to increase the security of key generation for the RSA algorithm.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2022, 25(1); 35--57
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and characterization of a novel knee articulation mechanism
    Autorzy:
    Olinski, M.
    Gronowicz, A.
    Handke, A.
    Ceccarelli, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/265067.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    staw kolanowy
    optymalizacja
    eksperymenty numeryczne
    knee joint
    3 DOF linkage
    synthesis
    optimization
    numerical experiments
    Opis:
    The paper is focused on designing a novel controllable and adjustable mechanism for reproducing human knee joint’s complex motion by taking into account the flexion/extension movement in the sagittal plane, in combination with roll and slide. Main requirements for a knee rehabilitation supporting device are specified by researching the knee’s anatomy and already existing mechanisms. A three degree of freedom (3 DOF) system (four-bar like linkage with controlled variable lengths of rockers) is synthesised to perform the reference path of instantaneous centre of rotation (ICR). Finally, a preliminary design of the adaptive mechanism is elaborated and a numerical model is built in Adams. Numerical results are derived from simulations that are presented to evaluate the accuracy of the reproduced movement and the mechanism’s capabilities.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 3; 611-622
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Equivalent diagrams of fractional order elements
    Autorzy:
    Różowicz, Sebastian
    Włodarczyk, Maciej
    Zawadzki, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/27324011.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    fractional order derivative
    Laplace transform for fractional order systems
    CFE method
    circuit synthesis
    numerical experiments
    Opis:
    This paper presents equivalent impedance and operator admittance systems for fractional order elements. Presented models of fractional order elements of the type: sαL,sub>α and 1/sαCsub>α, (0 α 1) were obtained using the Laplace transform based on the expansion of the factor sign to an infinite fraction with varying degrees of accuracy – the continued fraction expansion method (CFE). Then circuit synthesis methods were applied. As a result, equivalent circuit diagrams of fractional order elements were obtained. The obtained equivalent schemes consist both of classical RLC elements, as well as active elements built based on operational amplifiers. Numerical experiments were conducted for the constructed models, presenting responses to selected input signals.
    Źródło:
    Archives of Control Sciences; 2023, 33, 4; 801--827
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pulsed Focused Nonlinear Acoustic Fields from Clinically Relevant Therapeutic Sources in Layered Media: Experimental Data and Numerical Prediction Results
    Autorzy:
    Kujawska, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/176699.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    therapeutic ultrasound
    circular focused transducers
    pulsed nonlinear acoustic pressure beams
    layered media
    numerical modeling and experiments
    Opis:
    In many therapeutic applications of a pulsed focused ultrasound with various intensities the finite- amplitude acoustic waves propagate in water before penetrating into tissues and their local heating. Water is used as the matching, cooling and harmonics generating medium. In order to design ultrasonic probes for various therapeutic applications based on the local tissue heating induced in selected organs as well as to plan ultrasonic regimes of treatment a knowledge of pressure variations in pulsed focused nonlinear acoustic beams produced in layered media is necessary. The main objective of this work was to verify experimentally the applicability of the recently developed numerical model based on the Time- Averaged Wave Envelope (TAWE) approach (Wójcik et al., 2006) as an effective research tool for predicting the pulsed focused nonlinear fields produced in two-layer media comprising of water and tested materials (with attenuation arbitrarily dependent on frequency) by clinically relevant axially-symmetric therapeutic sources. First, the model was verified in water as a reference medium with known linear and nonlinear acoustic properties. The measurements in water were carried out at a 25.C temperature using a 2.25 MHz circular focused (f/3.0) transducer with an effective diameter of 29 mm. The measurement results obtained for 8-cycle tone bursts with three different initial pressure amplitudes varied between 37 kPa and 113 kPa were compared with the numerical predictions obtained for the source boundary condition parameters determined experimentally. The comparison of the experimental results with those simulated numerically has shown that the model based on the TAWE approach predicts well both the spatial-peak and spatial-spectral pressure variations in the pulsed focused nonlinear beams produced by the transducer used in water for all excitation levels complying with the condition corresponding to weak or moderate source-pressure levels. Quantitative analysis of the simulated nonlinear beams from circular transducers with ka ť 1 allowed to show that the axial distance at which sudden accretion of the 2nd or higher harmonics amplitude appears is specific for this transducer regardless of the excitation level providing weak to moderate nonlinear fields. For the transducer used, the axial distance at which the 2nd harmonics amplitude suddenly begins to grow was found to be equal to 60 mm. Then, the model was verified experimentally for two-layer parallel media comprising of a 60-mm water layer and a 60-mm layer of 1.3-butanediol (99%, Sigma-Aldrich Chemie GmbH, Steinheim, Germany). This medium was selected because of its tissue-mimicking acoustic properties and known nonlinearity parameter B/A. The measurements of both, the peak- and harmonic-pressure variations in the pulsed nonlinear acoustic beams produced in two-layer media (water/1.3-butanediol) were performed for the same source boundary conditions as in water. The measurement results were compared with those simulated numerically. The good agreement between the measured data and numerical calculations has shown that the model based on the TAWE approach is well suited to predict both the peak and harmonic pressure variations in the pulsed focused nonlinear sound beams produced in layered media by clinically relevant therapeutic sources. Finally, the pulsed focused nonlinear fields from the transducer used in two-layer media: water/castor oil, water/silicone oil (Dow Corning Ltd., Coventry, UK), water/human brain and water/pig liver were predicted for various values of the nonlinearity parameter of tested media.
    Źródło:
    Archives of Acoustics; 2012, 37, 3; 269-278
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laboratory and numerical experiments into efficient management of VDR filter plants
    Autorzy:
    Zielina, M.
    Dąbrowski, W.
    Mackie, R. I.
    Powiązania:
    https://bibliotekanauki.pl/articles/206922.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    filters
    environmental engineering
    waste management
    deep bed filtration
    efficient management
    numerical experiments
    phenomenological modeling
    mathematical model
    theoretical modelling
    filtry
    inżynieria środowiska
    gospodarowanie odpadami
    filtracja wgłębna
    sterowanie efektywne
    eksperymenty numeryczne
    modelowanie fenomenologiczne
    model matematyczny
    modelowanie teoretyczne
    Opis:
    runs are achieved when the highest flow through the most recently backwashed filter and the highest available head loss coincide. This rule has previously been published by Dąbrowski, who used a simplified mathematical model of VDR filters developed by Di Bernardo. However, until now no experimental verification of this optimisation approach has been presented. A series of tests were carried out on a laboratory VDR filter plant, using a suspension collected from an industrial sedimentation tank and using alum as a coagulant. The results of the experiments were compared with computations carried out according to a combined unit bed element (UBE)-phenomenological model of deep bed filtration adapted to VDR operation by Mackie and Zhao. It was confirmed that the longest filtration runs did indeed correspond to the pairs of the highest H and q1/qavr. The UBE-phenomenological model of deep bed filtration gave results of computations quite close to experimental results and improved the accuracy of calculations based on the theoretical model by Di Bernardo.
    Źródło:
    Environment Protection Engineering; 2015, 41, 3; 101-120
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling and Experimental Testing of Hybrid Joints Made of: Aluminium Adherends, Adhesive Layers and Rivets for Aerospace Applications
    Autorzy:
    Sadowski, T.
    Golewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/356712.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hybrid joints
    numerical modelling
    experiments
    Opis:
    The contemporary demands in different branches of engineering require application of new multi-component materials and structural systems. Appropriately chosen joining technology can offer significant enhancement of structural system performance in terms of effectiveness, reliability, safety and other design criteria. The modern applications of complex joints are of great technological interest as they permit to combine and to enhance the individual effects of each kind of joint. This is of great importance for modern applications in different branches of engineering: aerospace, mechanical and civil. Therefore in this paper we will focus on the analysis of mechanical response of adhesive joint of aluminium strips reinforced by rivets. The aim of the paper is to investigate experimentally the mechanical behaviour of adhesive joint of aluminium strips reinforced by rivets for industrial applications in aerospace. The considered joint was subjected to uniaxial loading. The tests in this paper were performed for: • classical adhesive joint in order to investigate material parameters for numerical modelling of the hybrid joint • hybrid joining of the structural elements in order to investigate the reinforcement effect. The experiments with application of digital image ARAMIS system allowed for on-line monitoring of the deformation process of the considered joining elements. The particular distributions of displacement fields at the joint surface were estimated for any stage of loading process. Numerical modelling was performed for experimentally investigated specimens. The materials parameters, necessary for calculation, were estimated from experiments. FEA modelling was done with the help of ABAQUS code.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1577-1583
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The bootstrap method as a tool to improve the design of experiments
    Autorzy:
    Dwornicka, Renata
    Radek, Norbert
    Pietraszek, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/88607.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    bootstrap
    statistics
    design of experiments
    numerical simulation
    statystyka
    projektowanie eksperymentów
    symulacje numeryczne
    Opis:
    The paper considers the use of the bootstrap method to improve the determination of confidence intervals identified by the DOE (design of experiment) procedure. Two different approaches have been used: one that is appropriate for factorial designs and the other one relevant to the methodology of the response surface. Both approaches were tested on the real experiment datasets and compared with the results obtained from the classical statistical expressions based on well known asymptotic formulas derived from the distribution.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 724-729
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The smoothed bootstrap fine-tuning
    Autorzy:
    Dwornicka, Renata
    Goroshko, Andrii
    Pietraszek, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/88564.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    smoothed bootstrap
    statistic
    design of experiments
    numerical simulation
    projektowanie eksperymentów
    statystyka
    symulacja numeryczna
    Opis:
    The bootstrap method is a well-known method to gather a full probability distribution from the dataset of a small sample. The simple bootstrap i.e. resampling from the raw dataset often leads to a significant irregularities in a shape of resulting empirical distribution due to the discontinuity of a support. The remedy for these irregularities is the smoothed bootstrap: a small random shift of source points before each resampling. This shift is controlled by specifically selected distributions. The key issue is such parameter settings of these distributions to achieve the desired characteristics of the empirical distribution. This paper describes an example of this procedure.
    Źródło:
    System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 716-723
    2657-5450
    Pojawia się w:
    System Safety : Human - Technical Facility - Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jak nie porównywać wyników badań bioelektromagnetycznych
    How to not compare results in bioelectromagnetic studies
    Autorzy:
    Długosz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/131978.pdf
    Data publikacji:
    2017
    Wydawca:
    Wrocławska Wyższa Szkoła Informatyki Stosowanej Horyzont
    Tematy:
    badania bioelektromagnetyczne
    metody numeryczne
    pole elektromagnetyczne
    dokładność badań
    układy ekspozycyjne
    bioelectromagnetic studies
    electromagnetic field
    accuracy of experiments
    exposure systems
    numerical methods
    Opis:
    Artykuł poświęcony jest problemom związanym z porównywaniem wyników badań bioelektromagnetycznych. Można zauważyć, że badania poświęcone wpływom pola elektromagnetycznego, zwłaszcza na obiekty biologiczne, dają niejednoznaczne wyniki, które ciężko porównać między różnymi ośrodkami naukowymi. Wiele błędów wynika z technicznych aspektów tego typu eksperymentów. W pracy przedstawiono wybrane z nich. W badaniach nie wykorzystywano obiektów biologicznych, a jedynie ich numeryczne modele.
    The paper is devoted to the problem of difficulty in results comparision of bioelectromeganetic experiments. It may be noticed that many studies which are devoted to biological effects of electromagnetic field exposure on biological objects can not be compared to each other. There may be many reasons responisble for that state. Certainly one of them are different sources of uncertainty resulting from the technical aspects of this type of research. One such source is influence of exposure system on tested object.
    Źródło:
    Biuletyn Naukowy Wrocławskiej Wyższej Szkoły Informatyki Stosowanej. Informatyka; 2017, 7, 2; 13-16
    2082-9892
    Pojawia się w:
    Biuletyn Naukowy Wrocławskiej Wyższej Szkoły Informatyki Stosowanej. Informatyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quality improvement of a safety valve with the use of numerical and experimental studies
    Autorzy:
    Filo, Grzegorz
    Domagała, Mariusz
    Lempa, Paweł
    Fabiś-Domagała, Joanna
    Kwiatkowski, Dominik
    Momeni, Hassan
    Powiązania:
    https://bibliotekanauki.pl/articles/104055.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    hydraulic system protection
    safety valve
    relief valve
    numerical modelling
    test bench experiments
    układ hydrauliczny
    zawór bezpieczeństwa
    zawór nadmiarowy
    modelowanie numeryczne
    testy eksperymentalne
    Opis:
    This article presents results of numerical modelling, simulation and test bench experiments of a hydraulic direct-acting relief valve was used as a safety valve. The analyzed safety valve was placed in a system consisting of a fixed-speed pump, a control valve, a hydraulic cylinder as an actuator and a second pressure valve in the load line used as a payload generator for the cylinder. In the first step mathematical model of the system was formulated in the form of a system of ordinary differential equations. Next, simulation model was created in Matlab/Simulink. Simulations were carried out for different values of the actuator payload. The obtained results include time series of pressure, flow rate and displacement of the actuator piston. In order to confirm simulation results, a test bench was built and series of experiments were carried out. High compliance of simulation and laboratory results was obtained. It was confirmed that the proposed solution with the relief valve used as a safety valve fulfills its task of protecting the hydraulic system from excessive pressure increase.
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 378-385
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of fluid flow inside the flow control valve
    Autorzy:
    Domagała, Mariusz
    Momeni, Hassan
    Fabis-Domagała, Joanna
    Krawczyk, Mariusz
    Filo, Grzegorz
    Bikass, Saeed
    Powiązania:
    https://bibliotekanauki.pl/articles/104138.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Menedżerów Jakości i Produkcji
    Tematy:
    hydraulic system protection
    safety valve
    relief valve
    numerical modelling
    test bench experiments
    układ hydrauliczny
    zawór bezpieczeństwa
    zawór nadmiarowy
    modelowanie numeryczne
    eksperyment badawczy
    Opis:
    Hydraulic valves are widely used in many branches and they are still developed and improved. Due to the problem with verification of flow phenomena which appears during valves operation numerical simulations methods are tools which allows to improved valves design. This paper presents numerical simulation of fluid flow inside flow control valve.
    Źródło:
    Quality Production Improvement - QPI; 2019, 1, 1; 394-399
    2657-8603
    Pojawia się w:
    Quality Production Improvement - QPI
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Failure mechanism and supporting measures for large deformation of soft rock roadway in Baluba copper mine
    Mechanizm pękania skał i kroki zapobiegawcze podejmowane w celu przeciwdziałania odkształceniom chodnika prowadzonego w skałach miękkich w kopalni miedzi Baluba
    Autorzy:
    Wu, A.
    Chen, S.
    Wang, Y.
    Chen, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/219772.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chodnik prowadzony w skałach miękkich
    analiza teoretyczna
    symulacje numeryczne
    eksperymenty w terenie
    parametry podpór stropu
    soft rock roadway
    theoretical analysis
    numerical simulation
    field experiments
    support parameters
    Opis:
    To solve the problem of large deformation soft rock roadway with complicated stress condition in Baluba copper mine, the characteristics of roadway deformation and failure modes are analyzed deeply on the basis of geological survey. Combined with the theoretical analysis and numerical simulation, the new reinforcement technology with floor mudsill and grouting anchor cable is proposed. Moreover, the three dimension numerical simulation model is established by the software FLAC-3D, the support parameter is optimized by it. The results show that the optical array pitch of the U-steel shelf arch is 0.8 m, and the optical array pitch of the grouting anchor cable is 2.4 m. At last, the field experiments are done all over the soft rock roadway. Engineering practice shows that the deformation of soft rock roadway in Baluba copper mine is effectively controlled by adopting the new reinforcement technology, which can provide certain references for similar engineering.
    W celu rozwiązania problemu powstawania znacznych odkształceń chodnika biegnącego w skale miękkiej w skomplikowanym układzie naprężeń, przeprowadzono dogłębną analizę warunków odkształceń i pękania skał w oparciu o badania geologiczne. W oparciu o rozważania teoretyczne i symulacje numeryczne, zaproponowano nową technologię wzmocnienia progu spągowego z iłowców z linami kotwiącymi osadzonymi w zaprawie. Na podstawie trójwymiarowego modelu do symulacji numerycznych opracowanego z wykorzystaniem oprogramowania FLAC-3D dokonano optymalizacji parametrów podpór. Wyniki pokazują, że optymalne rozmieszczenie stalowych podpór wykonanych z profili w kształcie U wyniesie 0.8 m, zaś optymalny rozstaw mocowań lin wynosi 2.4 m. W końcowym etapie przeprowadzono eksperymenty terenowe na całej długości chodnika. Praktyka inżynierska wskazuje, że odkształcenia chodników prowadzonych w skałach miękkich w kopalni Baluba mogą być skutecznie kontrolowane poprzez zastosowanie nowej metody wzmocnienia, która stanowić może podstawę dla opracowywania skutecznych technik wzmacniania stropu w chodnikach prowadzonych w podobnych warunkach geologicznych.
    Źródło:
    Archives of Mining Sciences; 2018, 63, 2; 449-464
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Landslide stability analysis with the use of the design of experiments method – case study of souk ahras, Algeria
    Autorzy:
    Charef, Nouar
    Mezhoudi, Issam
    Boumezbeur, Abderrahmane
    Harrat, Nabil
    Powiązania:
    https://bibliotekanauki.pl/articles/2201668.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
    Tematy:
    landslide
    Souk-Ahras region
    numerical modeling
    safety factor
    geotechnical parameters
    design of experiments DoE
    response surface methodology
    RSM
    osuwisko
    region Souk-Ahras
    modelowanie numeryczne
    współczynnik bezpieczeństwa
    parametry geotechniczne
    Opis:
    In the northeast of Algeria, Souk Ahras area is known for the severity and spread of landslides, especially in Mechroha and Zaarouria municipalities. Stability analysis of landslides in these areas depends on the calculations of safety factor according to several parameters (physical, mechanical, geological…). The aim of this study is to investigate the parameters affecting the safety factor using the design of experiments (DOE) method, central composite design (CCD) and response surfaces methodology (RSM). These methods use parameter modeling and optimization to discuss a solution of landslide hazard by developing models of safety factor (Fs) considered as response. The other parameters adopted as input independent factors are geotechnical physical and mechanical parameters such as: the dry and wet unit weight (γd, γh), the water content (w), the plasticity and liquidity limits and the plasticity index (WL, WP, IP), the percentage of fine elements Ff (%) < 0.08 mm), the cohesion C and the internal friction angle (Phi). Obtained results show high correlations with a regression coefficient R2 of 0.88 and 0.93 in the two cases study and the predicted factor of safety model fit best to those obtained in the analytical and numerical modeling procedure. The final model is applicable to give reliable results on the safety factor of landslides.
    Źródło:
    Geomatics, Landmanagement and Landscape; 2022, 4; 137--150
    2300-1496
    Pojawia się w:
    Geomatics, Landmanagement and Landscape
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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