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    Wyświetlanie 1-24 z 24
    Tytuł:
    Numerical modelling of hydraulically bonded mixture with rubber admixture due to applied mechanical loadings
    Autorzy:
    Pietras, D.
    Sadowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/391052.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    virtual test
    XFEM
    FEM
    multi-scale modelling
    Opis:
    Abstract: In this paper the application of the Extended Finite Element Method (XFEM) to anticipate change of the behaviour of composite with complex internal structure after use of the admixtures was presented. The response to mechanical loadings of bent beams made of hydraulically bonded mixture with rubber admixture was considered. The impact of the rubber granulate on the value of fracture energy was analysed. Moreover, the influence of an interfacial transmission zone quality on the achieved effect was assessed. Calculations were conducted by means of the muli-scale numerical model which was built in ABAQUS finite element method environment. The results derived indicate beneficial effect of rubber granulate on fracture energy of hydraulically bonded mixture.
    Źródło:
    Budownictwo i Architektura; 2017, 16, 3; 95-102
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-scale simulation of hybrid silicon nano-electromechanical (NEM) information systems
    Autorzy:
    Mizuta, H.
    Ramirez, M. A. G.
    Tsuchiya, Y.
    Nagami, T.
    Sawai, S.
    Oda, S.
    Okamoto, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/384267.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    multi-scale simulation
    NEMS
    suspended gate
    non-volatile memory
    phonon
    Opis:
    This paper presents emerging NEM hybrid systems for advanced information processing and describes our recent attempts of developing new multi-physics simulation technologies for these NEM systems at micro-, nano- and atomscales.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 58-61
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The key problems of local approach to cleavage fracture
    Kluczowe zagadnienia w lokalnym ujęciu kruchego pękania
    Autorzy:
    Kotrechko, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/279830.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    local approach to fracture
    multi-scale model
    local fracture stress
    Opis:
    Based on the suggested multi-scale model of Local Approach (LA) to fracture, four main problems of LA are considered, namely: (i) the effect of micro-stress fluctuations on the crack nuclei instability; (ii) intensity of micro-crack nucleation and its influence on fracture probability; (iii) theoretical and experimental assessment of the value of threshold stress; (iv) stochastic analysis of “multi-barrier” effect at micro-crack growth in polycrystalline metal.
    W oparciu o zaproponowany wieloskalowy model lokalnego sformułowania procesu pękania (Local Approach – LA) wyróżniono cztery podstawowe problemy do rozważenia: (i) efekt fluktuacji makronaprężeń na niestabilność jądra pęknięcia, (ii) intensywność zawiązywania się mikropęknięcia i jego wpływ na prawdopodobieństwo powstania przełomu, (iii) teoretyczne i eksperymentalne oszacowanie wartości naprężenia krytycznego, (iv) stochastyczna analiza efektu „wieloprogowego” na wzrost mikropęknięcia w metalu polikrystalicznym.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 1; 75-89
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multifrequency-based non-linear approach to analyzing implied volatility transmission across global financial markets
    Autorzy:
    Boateng, Ebenezer
    Asafo-Adjei, Emmanuel
    Gatsi, John Gartchie
    Gherghina, Ştefan Cristian
    Simionescu, Liliana Nicoleta
    Powiązania:
    https://bibliotekanauki.pl/articles/19322599.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    shocks transmission
    information flow
    Rényi transfer entropy
    multi-scale
    market conditions
    Opis:
    Research background: The contagious impact of the COVID-19 pandemic has heightened financial market's volatility, nonlinearity, asymmetric and nonstationary dynamics. Hence, the existing relationship among financial assets may have been altered. Moreover, the level of investor risk aversion and market opportunities could also alter in the pandemic. Predictably, investors in the heat of the moment are concerned about minimizing losses. In order to determine the level of hedge risks between implied volatilities in the COVID-19 pandemic through information flow, it is required to take into account the increased vagueness of economic projections as well as the increased uncertainty in asset values as a result of the pandemic. Purpose of the article: The study aims to examine the transmission of information between the VIX-implied volatility index for S&P 500 and fifteen other implied volatility indices in the COVID-19 pandemic. Methods: We relied on daily changes in the VIX and fifteen other implied volatility indices from commodities, currencies, and stocks. The study employed the improved complete ensemble empirical mode decomposition with adaptive noise which is in line with the heterogeneous expectations of market participants to denoise the data and extract intrinsic mode functions (IMFs). Subsequently, we clustered the IMFs based on common features into high, low, and medium frequencies. The analysis was carried out using Rényi transfer entropy (RTE), which allowed for the evaluation of both linear and non-linear, as well as varied distributions of the market dynamics. Findings & value added: Findings from the RTE revealed a bi-directional flow of negative information amid the VIX and each of the volatility indices, particularly in the long term. We found this behavior of the markets to be consistent at varying levels of investors' risk aversion. The findings help investors with their portfolio strategies in the time of the pandemic, which has resulted in fluctuating levels of risk aversion. Our findings characterize global financial markets to be "non-linear heterogeneous evolutionary systems". The results also lend support to the emerging delayed volatility of market competitiveness and external shocks hypothesis.
    Źródło:
    Oeconomia Copernicana; 2022, 13, 3; 699-743
    2083-1277
    Pojawia się w:
    Oeconomia Copernicana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detecting objects using Rolling Convolution and Recurrent Neural Network
    Autorzy:
    Huang, WenQing
    Huang, MingZhu
    Wang, YaMing
    Powiązania:
    https://bibliotekanauki.pl/articles/226942.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multi-scale features
    global context information
    rolling convolution
    recurrent neural network
    Opis:
    At present, most of the existing target detection algorithms use the method of region proposal to search for the target in the image. The most effective regional proposal method usually requires thousands of target prediction areas to achieve high recall rate.This lowers the detection efficiency. Even though recent region proposal network approach have yielded good results by using hundreds of proposals, it still faces the challenge when applied to small objects and precise locations. This is mainly because these approaches use coarse feature. Therefore, we propose a new method for extracting more efficient global features and multi-scale features to provide target detection performance. Given that feature maps under continuous convolution lose the resolution required to detect small objects when obtaining deeper semantic information; hence, we use rolling convolution (RC) to maintain the high resolution of low-level feature maps to explore objects in greater detail, even if there is no structure dedicated to combining the features of multiple convolutional layers. Furthermore, we use a recurrent neural network of multiple gated recurrent units (GRUs) at the top of the convolutional layer to highlight useful global context locations for assisting in the detection of objects. Through experiments in the benchmark data set, our proposed method achieved 78.2% mAP in PASCAL VOC 2007 and 72.3% mAP in PASCAL VOC 2012 dataset. It has been verified through many experiments that this method has reached a more advanced level of detection.
    Źródło:
    International Journal of Electronics and Telecommunications; 2019, 65, 2; 293-301
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parallelization of Concise Convolutional Neural Networks for Plant Classification
    Autorzy:
    Sembiring, Arnes
    Away, Yuwaldi
    Arnia, Fitri
    Muharar, Rusdha
    Powiązania:
    https://bibliotekanauki.pl/articles/2202377.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    parallelisation
    concise CNN
    plant classification
    multi-scale CNN
    convolutional neural network
    Opis:
    Monitoring the agricultural field is the key to preventing the spread of disease and handling it quickly. The computer-based automatic monitoring system can meet the needs of large-scale and real-time monitoring. Plant classifiers that can work quickly in computer with limited resources are needed to realize this monitoring system. This study proposes convolutional neural network (CNN) architecture as a plant classifier based on leaf imagery. This architecture was built by parallelizing two concise CNN channels with different filter sizes using the addition operation. GoogleNet, SqueezeNet and MobileNetV2 were used to compare the performance of the proposed architecture. The classification performance of all these architectures was tested using the PlantVillage dataset which consists of 38 classes and 14 plant types. The experimental results indicated that the proposed architecture with a smaller number of parameters achieved nearly the same accuracy as the comparison architectures. In addition, the proposed architecture classified images 5.12 times faster than SqueezeNet, 8.23 times faster than GoogleNet, and 9.4 times faster than MobileNetV2. These findings suggest that when implemented in the agricultural field, the proposed architecture can be a reliable and faster plant classifier with fewer resources.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 2; 61--71
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of the microstructure and properties in the length scales varying from nano- to macroscopic
    Autorzy:
    Kurzydłowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/199877.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multi length scale modelling
    grain boundaries
    nanomaterials
    Opis:
    The aim of this paper is to show the recent progress in multi length scale modelling of the engineering materials. This progress is demonstrated using a series of examples addressing, in particular, the role of effect of the grain boundaries in shaping properties of nano-polycrystalline metals.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 2; 217-226
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The development of multi-scale data management for CityGML-based 3D buildings
    Autorzy:
    Karim, Hairi
    Rahman, Alias Abdul
    Azri, Suhaibah
    Halim, Zurairah
    Powiązania:
    https://bibliotekanauki.pl/articles/2055778.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    CityGML
    Level of Details (LoD)
    multi-scale
    scale unique ID
    cross-scale query
    spatial scale data management
    Opis:
    The CityGML model is now the norm for smart city or digital twin city development for better planning, management, risk-related modelling and other applications. CityGML comes with five levels of detail (LoD), mainly constructed from point cloud measurements and images of several systems, resulting in a variety of accuracies and detailed models. The LoDs, also known as pre-defined multi-scale models, require large storage-memory-graphic consumption compared to single scale models. Furthermore, these multi-scales have redundancy in geometries, attributes, are costly in terms of time and workload in updating tasks, and are difficult to view in a single viewer. It is essential for data owners to engage with a suitable multi-scale spatial management solution in minimizes the drawbacks of the current implementation. The proper construction, control and management of multi-scale models are needed to encourage and expedite data sharing among data owners, agencies, stakeholders and public users for efficient information retrieval and analyses. This paper discusses the construction of the CityGML model with different LoDs using several datasets. A scale unique ID is introduced to connect all respective LoDs for cross-LoD information queries within a single viewer. The paper also highlights the benefits of intermediate outputs and limitations of the proposed solution, as well as suggestions for the future.
    Źródło:
    Geomatics and Environmental Engineering; 2022, 16, 1; 71--94
    1898-1135
    Pojawia się w:
    Geomatics and Environmental Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of crack resistance in epoxy/boron nitride nanotube nanocomposites based on multi-scale methodInvestigation of crack resistance in epoxy/boron nitride nanotube nanocomposites based on multi-scale method
    Autorzy:
    Hemmatian, Hossein
    Zamani, Mohammad Reza
    Jam, Jafar Eskandari
    Powiązania:
    https://bibliotekanauki.pl/articles/280181.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    boron nitride nanotube
    epoxy
    fracture modes
    finite element model
    multi-scale method
    Opis:
    Boron nitride nanotubes (BNNTs) possess superior mechanical, thermal and electrical properties and are also suitable for biocomposites. These properties make them a favorable reinforcement for nanocomposites. Since experimental studies on nanocomposites are timeconsuming, costly, and require accurate implementation, finite element analysis is used for nanocomposite modeling. In this work, a representative volume element (RVE) of epoxy/BNNT nanocomposites based on multi-scale modeling is considered. The bonds of BNNT are modeled by 3D beam elements. Also non-linear spring elements are employed to simulate the van der Waals bonds between the nanotube and matrix based on the Lennard- -Jones potential. Young’s and shear modulus of BNNTs are in ranges of 1.039-1.041 TPa and 0.44-0.52 TPa, respectively. Three fracture modes (opening, shearing, and tearing) have been simulated and stress intensity factors have been determined for a pure matrix and nanocomposite by J integral. Numerical results indicate that by incorporation of BNNT in the epoxy matrix, stress intensity factors of three modes decrease. Also, by increasing the chirality of BNNT, crack resistance of shearing and tearing modes are enhanced, and stress intensity factor of opening mode reduced. BNNTs bridge the crack surface and prevent crack propagation.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 1; 207-219
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of a nonlinear tuned mass damper by using the multi-scale method
    Autorzy:
    Liu, Junfeng
    Yao, Ji
    Huang, Kun
    Zhang, Qing
    Ze, Li
    Powiązania:
    https://bibliotekanauki.pl/articles/2104766.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    nonlinear characteristics
    complex average method
    multi-scale method
    nonlinear design
    control performance
    Opis:
    A tuned mass damper is a kind of vibration damping device which has been widely used in tall buildings, machinery, bridges, aerospace engineering and other fields. In practical engineering applications, due to large deformation caused by large displacement, errors in engineering constructions and the existence of limit devices, the structure and tuned mass dampers inevitably produce some nonlinear characteristics, but these nonlinearities are often ignored. The results of this study confirm that the nonlinearity of the structure and the mass damper should be considered in the process of optimal frequency design, otherwise there will be a large deviation between the design optimal frequency of the mass damper and the actual optimal frequency. In this paper, nonlinear characteristics of the tuned mass damper and the main structure are considered. The first-order differential equations are obtained by using the complex average method, and the nonlinear equations of the tuned mass damper system are derived by using the multi-scale method. On this basis, the parameters are determined. The numerical results show that the error of the approximate solution method is small in the given example. The nonlinear tuned mass damper with nonlinear design exhibits a better control performance.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 463--477
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-Scale Approach and “Playing Scales” in Economic Geography
    Autorzy:
    Jakobson, Anatol Jakovlevich
    Blinov, Ivan Dmitriyevich
    Powiązania:
    https://bibliotekanauki.pl/articles/438933.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Pedagogiczny im. Komisji Edukacji Narodowej w Krakowie
    Tematy:
    multi-scale approach
    multiscaleness
    playing scales
    regional policy
    industry location
    inter-regional competition
    settlement
    Opis:
    The notions of multiscaleness and “playing scales” are considered for various spheres of economic geography: cartography, settlement geography, toponymics, ethno-historical geography, locating industrial production, touristic promotion, micro-regional (intra-urban) policy. The paper presents the idea of multiscaleness and “playing scales”, as well as the possibility of application of a multi- scale approach in economic geography.
    Źródło:
    Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego; 2014, 27; 211-218
    2080-1653
    Pojawia się w:
    Prace Komisji Geografii Przemysłu Polskiego Towarzystwa Geograficznego
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fault diagnosis of me marine diesel engine fuel injector with novel IRCMDE method
    Autorzy:
    Shi, Qingguo
    Hu, Yihuai
    Yan, Guohua
    Powiązania:
    https://bibliotekanauki.pl/articles/34608122.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    marine diesel engine
    fuel injector
    improved refined composite multi-scale dispersion entropy
    fault diagnosis
    Opis:
    As an important component of the fuel injection system, the fuel injector is crucial for ensuring the power, economy, and emissions for a whole ME (machine electronically-controlled) marine diesel engine. However, injectors are most prone to failures such as reduced pressure at the opening valve, clogged spray holes and worn needle valves, because of the harsh working conditions. The failure characteristics are non-stationary and non-linear. Therefore, to efficiently extract fault features, an improved refined composite multi-scale dispersion entropy (IRCMDE) is proposed, which uses the energy distribution of sampling points as weights for coarse-grained calculation, then fast correlation-based filter (FCBF) and support vector machine (SVM) are used for feature selection and fault classification, respectively. The experimental results from a MAN B&W 6S35ME-B9 marine diesel engine show that the proposed algorithm can achieve 92.12% fault accuracy for injector faults, which is higher than multiscale dispersion entropy (MDE), refined composite multiscale dispersion entropy (RCMDE) and multiscale permutation entropy (MPE). Moreover, the experiment has also proved that, due to the double-walled structure of the high-pressure fuel pipe, the fuel injection pressure signal is more accurate than the vibration signal in reflecting the injector operating conditions.
    Źródło:
    Polish Maritime Research; 2023, 3; 96-110
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of a boundary perforation on the Dirichlet energy
    Autorzy:
    Dambrine, M.
    Vial, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/970142.pdf
    Data publikacji:
    2005
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    pochodna kształtu
    pochodna topologiczna
    singular shape perturbation
    shape derivatives
    topological derivatives
    multi-scale asymptotic expansion
    Opis:
    We consider some singular perturbations of the boundary of a smooth domain. Such domain variations are not differentiable within the classical theory of shape calculus. We mimic the topological asymptotic and we derive an asymptotic expansion of the shape function in terms of a size parameter. The two-dimensional case of the Dirichlet energy is treated in detail. We give a full theoretical proof as well as a numerical confirmation of the results.
    Źródło:
    Control and Cybernetics; 2005, 34, 1; 117-136
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of different failure approaches in knotty wood
    Autorzy:
    Guindos, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/52443.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    knotty wood
    wood
    comparison
    failure prediction
    knot
    wood defect
    multi-scale modelling
    average stress approach
    Opis:
    This article presents and assesses 64 different ways for predicting the failure onset in knotty wooden beams. The aim is to provide engineers and modellers a generalview of how to evaluate the failure in wooden structural members with knots.The studied criteria included both the conventional point-based and average stress theories. Special attention was paid to the effect of the elements of the woodmesostructure, i.e. knots and fiber deviation, which can generate singular stress concentrations as notches or cracks would do in fracture mechanics. The case study consisted of predicting the failure onset of bending in structural wooden beams.A previously validated finite element model was used in order to compute the heterogeneous stresses. It was found that the knots caused considerable stress singularities so that the size of the average stress theory influenced the failure predictions by up to 23%. However, the variations generated by distinct phenomenologicalcriteria were in general much smaller. The application of the average stress theory in large stress integration volumes is strongly recommended when predicting the failure in wood members.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2014, 57, 193
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-scale curvature tensor analysis of machined surfaces
    Autorzy:
    Bartkowiak, T.
    Brown, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1203966.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    curvature tensor
    surface metrology
    multi-scale geometric characterization
    machining
    tensor krzywizny
    metrologia powierzchni
    charakterystyka geometryczna
    obróbka
    Opis:
    This paper demonstrates the use of multi-scale curvature analysis, an areal new surface characterization technique for better understanding topographies, for analyzing surfaces created by conventional machining and grinding. Curvature, like slope and area, changes with scale of observation, or calculation, on irregular surfaces, therefore it can be used for multi-scale geometric analysis. Curvatures on a surface should be indicative of topographically dependent behavior of a surface and curvatures are, in turn, influenced by the processing and use of the surface. Curvatures have not been well characterized previously. Curvature has been used for calculations in contact mechanics and for the evaluation of cutting edges. In the current work two parts were machined and then one of them was ground. The surface topographies were measured with a scanning laser confocal microscope. Plots of curvatures as a function of position and scale are presented, and the means and standard deviations of principal curvatures are plotted as a function of scale. Statistical analyses show the relations between curvature and these two manufacturing processes at multiple scales.
    Źródło:
    Archives of Mechanical Technology and Materials; 2016, 36; 44-50
    2450-9469
    Pojawia się w:
    Archives of Mechanical Technology and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shape optimisation of a ventricular assist device using a VADFEM computer program
    Autorzy:
    Kopernik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/307277.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ventricular assist device
    finite element method
    optimisation
    goal function
    multi-scale modelling
    metoda elementów skończonych
    optymalizacja
    komorowe wspomaganie pracy serca
    Opis:
    The Polish ventricular assist device, POLVAD_EXT, is made of a polymer designed to be covered with a nanocoating of titanium nitride to improve haemocompatibility. A loss of cohesion can occur between the coating and the substrate. An analysis of stress and strain states in a multi-scale model of the blood chamber was performed in the finite element computer program, VADFEM. The multiscale model is composed of a macro model of the blood chamber and a micro model of the titanium nitride (TiN) deposited on the polymer. The finite element method and the goal function, based on the triaxiality factor, are used to solve the problems formulated. The theories of non-linear elasticity and elasto-plasticity are applied. The goal of the paper is to optimise the construction of the POLVAD_EXT with respect to shape parameters.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2013, 15, 3; 81-87
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Degree of internationalization in mesoeconomic perspective
    Koncepcja poziomu internacjonalizacji w perspektywie mezoekonomicznej
    Autorzy:
    Mroczek-Dąbrowska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/589581.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    Degree of internationalization
    Industry
    Mesoeconomics
    Multi-item scale
    Branża
    Mezoekonomia
    Mierniki wielowymiarowe
    Stopień internacjonalizacji
    Opis:
    Although the degree of internationalization (DOI) is currently a well know concept, it still remains underresearched. It is most frequently cited in terms of firm’s international process, but it is much less applied for other levels of analysis. In this article we aim to propose an index of outward DOI that could be used for industry internationalization. We try to replicate Sullivan’s methodology except for the weights of components that we base on a Delphi study among Polish managers. We rank 73 Polish industries according to a DOI index composed of four single measures.
    Mimo iż stopień internacjonalizacji (DOI) jest konceptem powszechnie znanym, wciąż rzadko się stosuje badania z jego wykorzystaniem w praktyce. Najczęściej wykorzystuje się go przy badaniu procesu internacjonalizacji przedsiębiorstw, jednak zdecydowanie rzadziej w przypadku rozważań nad innymi poziomami analizy (w tym branżowej). Celem niniejszej publikacji jest, opierając się na osiągnięciach Sullivana, stworzenie indeksu zewnętrznej internacjonalizacji branży. Wagi indeksu zostały przypisane na podstawie badania metodą delficką. Indeks ten został następnie wyliczony dla 73 branż polskiej gospodarki.
    Źródło:
    Studia Ekonomiczne; 2016, 286; 96-106
    2083-8611
    Pojawia się w:
    Studia Ekonomiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabric Defect Detection and Classifier via Multi-Scale Dictionary Learning and an Adaptive Differential Evolution Optimized Regularization Extreme Learning Machine
    Wykrywanie defektów tkaniny i ich klasyfikacja poprzez zastosowanie maszyny uczącej się (ADE-RELM)
    Autorzy:
    Zhou, Zhiyu
    Wang, Chao
    Gao, Xu
    Zhu, Zefei
    Hu, Xudong
    Zheng, Xiao
    Jiang, Likai
    Powiązania:
    https://bibliotekanauki.pl/articles/233999.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    defect detection
    multi-scale dictionary learning
    regularisation extreme learning machine
    adaptive differential evolution
    defekty tkaniny
    skuteczność wykrywania defektów
    maszyna ucząca się
    Opis:
    To develop an automatic detection and classifier model for fabric defects, a novel detection and classifier technique based on multi-scale dictionary learning and the adaptive differential evolution algorithm optimised regularisation extreme learning machine (ADE-RELM) is proposed. Firstly in order to speed up dictionary updating under the condition of guaranteeing dictionary sparseness, k-means singular value decomposition (KSVD) dictionary learning is used. Then multi-scale KSVD dictionary learning is presented to extract texture features of textile images more accurately. Finally a unique ADE-RELM is designed to build a defect classifier model. In the training ADE-RELM classifier stage, a self-adaptive mutation operator is used to solve the parameter setting problem of the original differential evolution algorithm, then the adaptive differential evolution algorithm is utilised to calculate the optimal input weights and hidden bias of RELM. The method proposed is committed to detecting common defects like broken warp, broken weft, oil, and the declining warp of grey-level and pure colour fabrics. Experimental results show that compared with the traditional Gabor filter method, morphological operation and local binary pattern, the method proposed in this paper can locate defects precisely and achieve high detection efficiency.
    W celu opracowania automatycznego modelu wykrywania i klasyfikowania defektów tkanin, zaproponowano nowatorską technikę wykrywania i klasyfikowania opartą na zastosowaniu maszyny uczącej się (ADE-RELM). Proponowana metoda ma na celu wykrywanie powszechnych defektów, takich jak przerwana osnowa i wątek oraz zabrudzenia po oleju. Wyniki eksperymentalne pokazują, że w porównaniu z tradycyjną metodą filtrów Gabora, operacją morfologiczną i lokalnym wzorcem binarnym, proponowana w artykule metoda pozwala na precyzyjne zlokalizowanie defektów i osiąga wysoką skuteczność ich wykrywania.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2019, 1 (133); 67-77
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust content-based image retrieval using ICCV, GLCM, and DWT-MSLBP descriptors
    Autorzy:
    Chavda, Sagar
    Goyani, Mahesh
    Powiązania:
    https://bibliotekanauki.pl/articles/27312841.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    content-based image retrieval
    improved color coherence vector
    gray-level co-occurrence matrix
    discrete wavelet transform
    multi-scale local binary pattern
    principal component analysis
    linear discriminant analysis
    Opis:
    Content-based image retrieval (CBIR) retrieves visually similar images from a dataset based on a specified query. A CBIR system measures the similarities between a query and the image contents in a dataset and ranks the dataset images. This work presents a novel framework for retrieving similar images based on color and texture features. We have computed color features with an improved color coherence vector (ICCV) and texture features with a gray-level co-occurrence matrix (GLCM) along with DWT-MSLBP (which is derived from applying a modified multi-scale local binary pattern [MS-LBP] over a discrete wavelet transform [DWT], resulting in powerful textural features). The optimal features are computed with the help of principal component analysis (PCA) and linear discriminant analysis (LDA). The proposed work uses a variancebased approach for choosing the number of principal components/eigenvectors in PCA. PCA with a 99.99% variance preserves healthy features, and LDA selects robust ones from the set of features. The proposed method was tested on four benchmark datasets with Euclidean and city-block distances. The proposed method outshines all of the identified state-of-the-art literature methods.
    Źródło:
    Computer Science; 2022, 23 (1); 5--36
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Różnicowanie się struktury zgrupowań wijów Diplopoda i Chilopoda w drzewostanach sosnowych Puszczy Piskiej w 6. i 7. roku po zaburzeniu huraganem
    Variation in the structure of myriapod (Diplopoda and Chilopoda) assemblages in Scots pine stands in the Pisz Forest 6 and 7 years after the hurricane
    Autorzy:
    Tracz, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/986986.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Puszcza Piska
    drzewostany pohuraganowe
    drzewostany sosnowe
    ekosystemy lesne
    regeneracja
    zgrupowania zwierzat
    wije
    krocionogi
    Diplopoda
    pareczniki
    Chilopoda
    struktura zgrupowan
    Las Ochronny Szast
    ecological trait
    stump species
    saprophage
    zoophage
    multi−scale stand disturbance
    Opis:
    An analysis of the occurrence of saprophagous Diplopoda and zoophagous Chilopoda 6−7 years after the hurricane of 2002 was performed on 12 research plots established for this purpose in Pisz Forest District (northern Poland) in Scots pine stands with a different scale of disturbance. Three plots were selected per each stand disturbance variant: A – severe disturbance (approx. 10% of survived trees), B – moderate disturbance (approx. 30−40% of survived trees) and F – no disturbance. In addition, we used three plots in Scots pine plantations (U) established after a complete removal of disturbed stands and soil preparation. The faunistic material was collected in 2008 and 2009 using Barber traps. Compared with the research carried out in 2004 and 2005, the occurrence of new Diplopoda species increased by 7, and their highest diversity was observed in 2009 in A variant. New millipede (Diplopoda) species were found in the post−hurricane windthrow areas, whose number, in response to the changed environmental conditions (open space with high insolation, large amount of accumulated organic matter) increased. We used the GLM, NMDS and PCA to confirm the hypothesis that myriapod assemblages can be arranged along a clear disturbance gradient: from the most disturbed pine plantations and stands to the least affected stands. The regeneration of forest ecosystems, assessed on the basis of observations of the assemblages of carabid beetles by other authors, comprises a multi−step response to the disturbance. In the case of Diplopoda and Chilopoda, such a response observed after 2009 suggests the beginning of the restoration of myriapod assemblages inhabiting the ecosystems.
    Źródło:
    Sylwan; 2017, 161, 03; 218-225
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rapid NEGF-based calculation of ballistic current in ultra-short DG MOSFETs for circuit simulation
    Autorzy:
    Hosenfeld, F.
    Horst, F..
    Graef, M.
    Farokhnejad, A.
    Kloes, A.
    Iniguez, B.
    Lime, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/397995.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
    Tematy:
    ultra-short Double-Gate MOSFET
    nonequilibrium Green's function
    NEGF
    ballistic transport
    source-to-drain tunneling
    ultra-thin body
    UTB
    compact model
    multi-scale simulation
    nierównowagowe funkcje Greena
    transport balistyczny
    tunelowanie źródło-dren
    model kompaktowy
    symulacja wieloskalowa
    Opis:
    Shrinking gate length in conventional MOSFETs leads to increasing short channel effects like source-to-drain (SD) tunneling. Compact modeling designers are challenged to model these quantum mechanical effects. The complexity lies in the set-up between time efficiency, physical model relation and analytical equations. Multi-scale simulation bridges the gap between compact models, its fast and efficient calculation of the device terminal voltages, and numerical device models which consider the effects of nanoscale devices. These numerical models iterate between Poisson- and Schroedinger equation which significantly slows down the simulation performance. The physicsbased consideration of quantum effects like the SD tunneling makes the non-equilibrium Green’s function (NEGF) to a stateof-the-art method for the simulation of devices in the sub 10 nm region. This work introduces a semi-analytical NEGF model for ultra-short DG MOSFETs. Applying the closed-form potential solution of a classical compact model, the model turns the NEGF from an iterative numerical solution into a straightforward calculation. The applied mathematical approximations speed up the calculation time of the 1D NEGF. The model results for the ballistic channel current in DG-MOSFETs are compared with numerical NanoMOS TCAD [1] simulation data. Shown is the accurate potential calculation as well as the good agreement of the current characteristic for temperatures down to 75 K for channel lengths from 6 nm to 20 nm and channel thickness from 1.5 nm to 3 nm.
    Źródło:
    International Journal of Microelectronics and Computer Science; 2016, 7, 2; 65-72
    2080-8755
    2353-9607
    Pojawia się w:
    International Journal of Microelectronics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Odrespiratorowe zapalenie płuc chorych leczonych w oddziale intensywnej terapii
    Ventilator-associated pneumonia in patients treated in the intensive care unit
    Autorzy:
    Kubielas, Grzegorz
    Uchmanowicz, Izabella
    Powiązania:
    https://bibliotekanauki.pl/articles/2119984.pdf
    Data publikacji:
    2018-09-03
    Wydawca:
    Europejskie Centrum Kształcenia Podyplomowego
    Tematy:
    personel pielęgniarski
    oddział intensywnej terapii
    zakażenia szpitalne
    odrespiratorowe zapalenie płuc
    wentylacja mechaniczna
    toaleta drzewa oskrzelowego
    badania mikrobiologiczne
    skala niewydolności wielonarządowej APACHE II
    nursing staff
    intensive care unit
    nosocomial infections
    ventilator-associated pneumonia
    mechanical ventilation
    bronchial tree toilet
    microbiological examination
    multi-organ failure scale APACHE II
    Opis:
    Wstęp. Pacjent hospitalizowany w oddziale intensywnej terapii (OIT) wymaga ciągłej i wzmożonej opieki realizowanej przez zespół pielęgniarski. Polega ona na zapewnieniu całościowej pielęgnacji, monitorowaniu i wspomaganiu funkcji życiowych, ale także regularnej toalety drzewa oskrzelowego. Jednak nadal obserwowana jest narastająca częstość zakażeń szpitalnych u chorych leczonych w OIT. Jest ona ściśle powiązana z zastosowaniem wysokospecjalistycznych, często inwazyjnych, metod, takich jak wentylacja mechaniczna. Jednym z zakażeń szpitalnych związanych z intubacją tchawicy i mechaniczną wentylacją jest odrespiratorowe zapalenie płuc (VAP). Cel pracy. Ocena porównawcza dwóch metod toalety drzewa oskrzelowego. Celem drugorzędnym jest poprawa jakości opieki pielęgniarskiej u chorych z VAP w OIT na podstawie analizy uzyskanych wyników. Materiał i metody. Badaniami objęto grupę 30 pacjentów Klinicznego Oddziału Anestezjologii i Intensywnej Terapii (KOAIT) 4. Wojskowego Szpitala Klinicznego z Polikliniką we Wrocławiu. Wszyscy chorzy wymagali wentylacji mechanicznej co najmniej 72 godziny z powodu ostrej niewydolności oddechowej. Badaną grupę chorych podzielono ze względu na rodzaj zastosowanej techniki wykonania toalety drzewa oskrzelowego na: grupę I (n = 13) – odsysanie w systemie otwartym oraz grupę II (n = 17) – odsysanie w systemie zamkniętym. U wszystkich chorych pobrano wymaz z drzewa oskrzelowego metodą na ślepo (BBS), a uzyskany materiał przekazywano do laboratorium diagnostyki mikrobiologicznej. Ponadto analizowano dane demograficzne pacjentów oraz stan ogólny w skali APACHE II. Obserwację kończono w momencie zakończenia wentylacji mechanicznej i ekstubacji tchawicy lub z powodu zgonu chorego. Wyniki. Wśród przyczyn niewydolności oddechowej w badanej grupie pacjentów wykazano stan po nagłym zatrzymaniu krążenia (n = 10), uraz wielonarządowy (n = 8), uraz czaszkowo-mózgowy (n = 7) oraz inne (n = 5). Średni czas pobytu w OIT w grupie I wynosił 13 dni, a w grupie II – 11 dni. Liczba badań mikrobiologicznych wykonanych w grupie I wynosiła 70, a w grupie II – 78. Ujemny posiew w grupie I uzyskało 2 z 5 pacjentów do końca badań, a w grupie II było to 4 z 6 pacjentów. Najczęstszym typem drobnoustroju dla grupy I był Staphylococcus aureus dodatni w dobie 0 (n = 4), 3 (n = 4), 6 (n = 4) i 9 (n = 3) oraz Pseudomonas aeruginosa w dobie 12 (n = 2). Z kolei najczęstszym typem drobnoustroju dla grupy II był Acinetobacter baumani dodatni w dobie 0 (n = 5), 3 (n = 5), 6 (n = 5), 9 (n = 3) i 12 (n = 2). Badana grupa chorych nie różniła się istotnie w zakresie danych demograficznych (średni wiek 36 lat w grupie I oraz 42 lata w grupie II; rozkład płci to 9 mężczyzn i 4 kobiety w grupie I oraz 9 mężczyzn i 8 kobiet w grupie II) oraz w wyjściowym stanie klinicznym ocenianym w skali APACHE II (wynik 20 pkt. dla grupy I oraz 21 pkt. dla grupy II). Wnioski. Zastosowanie zamkniętego systemu ssącego pozwala na utrzymanie jałowości dolnych dróg oddechowych przez cały okres (12 dni) leczenia w OIT z użyciem respiratora, a system otwarty zapewnia jałowy posiew jedynie do 6. doby leczenia. Wiedza personelu pielęgniarskiego z zakresu pielęgnacji chorych wentylowanych mechanicznie jest ważnym elementem zapobiegania VAP. Zastosowanie metody pobierania materiału z dolnych dróg oddechowych w codziennej praktyce jest elementem właściwie prowadzonej strategii diagnostyki mikrobiologicznej z zaangażowaniem personelu pielęgniarskiego.
    Background. The patient hospitalized in the intensive care unit (ICU) requires continuous and intensified care performed by the nursing team. It consists in providing comprehensive care, monitoring and support of vital functions, as well as a regular toilet in the bronchial tree. However, the increasing incidence of nosocomial infections in patients treated in ICUs is still observed. It is closely related to the use of highly specialized, often invasive methods, such as mechanical ventilation. One of the nosocomial infections associated with tracheal intubation and mechanical ventilation is ventilator-associated pneumonia (VAP). Objectives. The main aim of the study was to compare of the assessment of two methods of the bronchial tree toilet. The secondary aim is to improve the quality of nursing care in patients with VAP in the ICU based on the analysis of the obtained results. Material and methods. The study involved a group of 30 patients of the Clinical Department of Anaesthesiology and Intensive Therapy at the 4th Military Clinical Hospital with the Polyclinic in Wroclaw. All patients required mechanical ventilation for at least 72 hours due to acute respiratory failure. The studied group of patients was divided according to the type of technique used to provide the toilet of the bronchial tree: group I (n = 13) – suction in the open system and group II (n = 17) – suction in a closed system. In all patients a bronchial swab was collected with the blind bronchial sampling (BBS) method and the obtained material was transferred to the microbiological diagnostic laboratory. In addition, patient demographics and the general state of the APACHE II scale were analyzed. Observation was terminated at the end of mechanical ventilation and extubation of the trachea or due to death of the patient. Results. Among the causes of respiratory failure in the examined group of patients, the state after sudden cardiac arrest was found (n = 10), multi-organ trauma (n = 8), craniocerebral trauma (n = 7) and others (n = 5). The average length of ICU stay in group I was 13 days, and in group II – 11 days. The number of microbiological tests performed in group I was 70, and in group II – 78. The negative microbiological test in group I was obtained by 2 out of 5 patients until the end of the study, and in group II it was 4 out of 6 patients. The most common type of microorganism for group I was Staphylococcus aureus positive on the day 0 (n = 4), 3 (n = 4), 6 (n = 4) and 9 (n = 3) and Pseudomonas aeruginosa on the day 12 (n = 2) . In turn, the most common type of microorganism for group II was Acinetobacter baumani positive at 0 (n = 5), 3 (n = 5), 6 (n = 5), 9 (n = 3) and 12 (n = 2). The studied group of patients did not differ significantly in terms of demographic data (mean age 36 years in group I and 42 in group II, sex distribution is 9 men and 4 women in group I and 9 men and 8 women in group II) and in the starting a clinical condition assessed on the APACHE II scale (score 20 points for group I and 21 points for group II). Conclusions. The use of a closed suction system allows the maintenance of sterility of the lower respiratory tract for the entire period (12 days) of ICU treatment with the use of a respirator, and the open system ensures sterile culture only until the 6th day of treatment. The knowledge of nursing staff in the care of mechanically ventilated patients is an important element of VAP prevention. The application of the method of collecting material from the lower respiratory tract in everyday practice is an element of properly conducted strategy of microbiological diagnostics with the involvement of nursing staff.
    Źródło:
    Współczesne Pielęgniarstwo i Ochrona Zdrowia; 2018, 7, 4; 83-88
    2084-4212
    Pojawia się w:
    Współczesne Pielęgniarstwo i Ochrona Zdrowia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Siting a centralised processing centre for artisanal and small-scale mining - a spatial multi-criteria approach
    Autorzy:
    Amoah, N.
    Stemn, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/92075.pdf
    Data publikacji:
    2018
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    artisanal and small-scale mining
    ASM
    centralised processing centre
    suitability analysis
    multi-criteria evaluation
    górnictwo tradycyjne i na małą skalę
    analiza przydatności
    ocena wielokryterialna
    Opis:
    Artisanal and small-scale mining is one of the global phenomena that is a threat to environmental health and safety. There are ambiguities in the manner in which an ore-processing facility operates. These ambiguities can cause environmental problems and hinder the mining capacity of these miners in Ghana. The vast majority of attempts to address these problems through the establishments of centralised processing centres have failed, with only a handful of successes. This research sought to use an established data-driven, geographic information based system to locate a centralised gold processing facility within the Wassa Amenfi-Prestea Mining Area in the Western region of Ghana. The study was designed to first determine the relevant factors that should be considered in the decision-making process for locating a centralised ore-processing facility. Secondly, it sought to implement the identified factors in a case study by identifying specific geospatial techniques that can best be applied to identify potential sites. By adopting in-depth consultations with four stakeholder groups for data collection and content analysis for data analysis, thirteen relevant factors were identified. However, in the case study, due to data unavailability, only seven of the factors were considered. Geoprocessing techniques including buffering and overlay analysis and multi-criteria decision analysis were employed to develop a model to identify the most preferred locations to site a centralised processing facility. Site characterisations and environmental considerations, incorporating identified constraints, to determine an appropriate location were selected. The final map output indicates estimated potential sites identified for the establishment of a centralised processing centre. The results obtained provide areas suitable for consideration.
    Źródło:
    Journal of Sustainable Mining; 2018, 17, 4; 215-225
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Region turystyczny
    Autorzy:
    Liszewski, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/1797468.pdf
    Data publikacji:
    2003-06-30
    Wydawca:
    Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
    Tematy:
    region turystyczny
    funkcjonalny region turystyczny
    turystyczny region metropolitalny
    peryferyjny
    węzłowy
    pasmowy
    wielkoprzestrzenny
    wyspecjalizowany i wielofunkcyjny
    tourist region
    functional tourist region
    metropolitan
    peripheral
    nodal
    linear
    large-scale
    specialized and multi-functional tourist regions
    Opis:
    Po omówieniu dotychczasowego dorobku naukowego w zakresie pojęcia i delimitacji regionu turystycznego, autor zaproponował własną, oryginalną definicję regionu jako przedmiotu poznania. Podstawą tej definicji uczynił autor koncentrację ruchu turystycznego, a następnie wydzielił siedem typów funkcjonalnego regionu turystycznego.
    Having discussed the academic achievements regarding the notion and delimitation of the tourist region, the author suggests his own original definition. He has based this definition on the concentration of tourist, and then isolated seven types of functional tourist region.
    Źródło:
    Turyzm; 2003, 13, 1; 43-54
    0867-5856
    2080-6922
    Pojawia się w:
    Turyzm
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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