Temat: multi-layer - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Advanced coating of interior of tanks for rising environmental safety - novel applications of polyurethanes
Autorzy:: Datta, J.
Haponiuk, J. T.
Powiązania:: https://bibliotekanauki.pl/articles/963383.pdf
Data publikacji:: 2008
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: polyurethane elastomers
multi-layer constructions
adhesives
recycling
Opis:: The aim of this study was to develop urethane elastomers of predefined properties to be used as elastic coating in the cargo tanks of tankers. A method for coating the liquid polyurethane system onto steel and steel-concrete elements, and a way to join polyurethane coating with the aforementioned elements, were elaborated. The technique of injection the reactive liquid polyurethane system onto cold steel elements was used. The method for utilization and recovery of urethane oligomerols from the waste polyurethane coating in chemical recycling by using low molecular weight glycols as glycolysis agents was proposed.
Źródło:: Polish Maritime Research; 2008, S 1; 8-13
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical simulation and experimental bending behaviour of multi-layer sandwich structures
Autorzy:: Arbaoui, J.
Schmitt, Y.
Pierrot, J-L.
Royer, F-X.
Powiązania:: https://bibliotekanauki.pl/articles/279468.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: multi-layer sandwich
polypropylene honeycomb
modelling
bending
Opis:: In this paper, an experimental investigation, an analytical analysis and a numerical model of a typical four-point bending test on a polypropylene honeycomb multi-layer sandwich panel are proposed. The polypropylene honeycomb core is modelled as a single solid and multi-layer of equivalent material properties. Analytical and numerical (finite element) homogenization approaches are used to compute the effective properties of the single honeycomb core and analytical homogenization of the multi-layer one. The results obtained by numerical simu- lation (finite element) of four-point bending are compared with the experimental results of a polypropylene honeycomb core/composite facing multi-layer sandwich structures.
Źródło:: Journal of Theoretical and Applied Mechanics; 2014, 52, 2; 431-442
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Statement Networks to Condition Monitoring of the Sealless Pump
Autorzy:: Rzydzik, S.
Amarowicz, M.
Psiuk, K.
Rogala, T.
Powiązania:: https://bibliotekanauki.pl/articles/226493.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: diagnostic model
statement network
multi-layer
expert system
Opis:: This paper shows an application of multi-layer statement networks to condition monitoring of the sealless magnetic drive pump. In this case, statement networks are computed based on the use of Bayesian probabilities. Moreover, the tool called REx which allows implementing such networks is described. An example of created four-layer network as well as final results of the performed tests shows also.
Źródło:: International Journal of Electronics and Telecommunications; 2014, 60, 3; 265-269
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The selected problems of multi-layer pavements modelling in design and diagnostics
Autorzy:: Graczyk, M.
Rafa, J.
Powiązania:: https://bibliotekanauki.pl/articles/241609.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: multi-layer
pavement
modelling
dynamic impact
thermal impact
Opis:: This paper will present selected problems connected with modelling of multi-layer pavements. Multi-layer pavement models, which utilize solutions such as the one of Boussinesq, Burmister, Kogan, Odemark and others, contain many simplifications, which bas a significant influence on the estimated real value of stress, strain, deflection as well as on the coefficient of pavement layers interaction. In the article based on the experiments carried out, we want to present our own layered-pavement models and solutions to them, which can be used mainly in the diagnostics of bearing capacity. The estimation of bearing capacity is conducted on the basis of full time data obtained with the FWD device. Moreover, the conclusions implicated by the above mentioned analysis are of big importance in design and operation process of road and airfield pavements. They pertain not only to the influence of modulus and thickness of particular layers but also to the way of pavement layers interaction, Poisson's coefficient, thermal characteristics and others.
Źródło:: Journal of KONES; 2007, 14, 1; 209-218
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Fuzzy method and neural network model parallel implementation of multi-layer neural network based on cloud computing for real time data transmission in large offshore platform
Autorzy:: Zhang, H..
Qin, W.
Powiązania:: https://bibliotekanauki.pl/articles/259083.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: parallel implementation
multi-layer neural network
cloud computing
Opis:: With the rapid development of electronic technology, network technology and cloud computing technology, the current data is increasing in the way of mass, has entered the era of big data. Based on cloud computing clusters, this paper proposes a novel method of parallel implementation of multilayered neural networks based on Map-Reduce. Namely in order to meet the requirements of big data processing, this paper presents an efficient mapping scheme for a fully connected multi-layered neural network, which is trained by using error back propagation (BP) algorithm based on Map-Reduce on cloud computing clusters (MRBP). The batch-training (or epoch-training) regimes are used by effective segmentation of samples on the clusters, and are adopted in the separated training method, weight summary to achieve convergence by iterating. For a parallel BP algorithm on the clusters and a serial BP algorithm on uniprocessor, the required time for implementing the algorithms is derived. The performance parameters, such as speed-up, optimal number and minimum of data nodes are evaluated for the parallel BP algorithm on the clusters. Experiment results demonstrate that the proposed parallel BP algorithm in this paper has better speed-up, faster convergence rate, less iterations than that of the existed algorithms.
Źródło:: Polish Maritime Research; 2017, S 2; 39-44
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Shape Optimization of Two-layer Acoustical Hoods Using an Artificial Immune Method
Autorzy:: Chiu, M-C.
Powiązania:: https://bibliotekanauki.pl/articles/177732.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: multi-layer
close-fitting acoustical hood
artificial immune method
Opis:: Research on acoustical hoods used in industry has been widely discussed; however, the assessment of shape optimization on space-constrained close-fitting acoustic hoods by adjusting design parameters has been neglected. Moreover, the acoustical performance for a one-layer acoustic hood used in a high intensity environment seems to be insufficient. Therefore, an assessment of an optimally shaped acoustical hood with two layers will be proposed. In this paper, a numerical case for depressing the noise level of a piece of equipment by optimally designing a shaped two-layer close-fitting acoustic hood under a constrained space will be introduced. Furthermore, to optimally search for a better designed set for the multi-layer acoustical hood, an artificial immune method (AIM) has been adopted as well. Consequently, this paper provides a quick and effective method to reduce equipment noise by optimally designing a shaped multi- layer close-fitting acoustic hood via the AIM searching technique.
Źródło:: Archives of Acoustics; 2012, 37, 2; 181-188
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Some of the photothermal properties of one-and two-layer structures
Wybrane własności fototermiczne struktur jedno- i dwuwarstwowych
Autorzy:: Pieszyński, K.
Powiązania:: https://bibliotekanauki.pl/articles/296555.pdf
Data publikacji:: 2007
Wydawca:: Politechnika Łódzka. Wydawnictwo Politechniki Łódzkiej
Tematy:: własności fototermiczne
struktura wielowarstwowa
photothermal effect
multi-layer system
Opis:: The results of numerical calculations of temperature on a multi-layer structures' surface illuminated with intensity periodically-modulated beam of light are presented. In fact the influence of some geometrical and thermal properties such structures on the amplitude of time-dependant temperature component is shown. Moreover, only one- and two-layer structures are taken into account.
Praca przedstawia wyniki obliczeń numerycznych temperatury na powierzchni struktur wielowarstwowych oświetlanych modulowaną wiązką światła. W szczególności pokazano jak na amplitudę zależnej od czasu składowej temperatury wpływają niektóre parametry geometryczne i cieplne takiej struktury. W pracy rozważano struktury jedno- i dwuwarstwowe.
Źródło:: Scientific Bulletin. Physics / Technical University of Łódź; 2007, 28; 45-51
1505-1013
2449-982X
Pojawia się w:: Scientific Bulletin. Physics / Technical University of Łódź
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Volumetric locking suppression method for nearly incompressible nonlinear elastic multi-layer beams using ANCF elements
Autorzy:: Orzechowski, G.
Frączek, J.
Powiązania:: https://bibliotekanauki.pl/articles/949295.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: multibody dynamics
ANCF
incompressibility
locking phenomena
multi-layer beams
Opis:: The analysis and solution of many modern flexible multibody dynamic problems require formulations that are able to effectively model bodies with nonlinear materials undergoing large displacements and deformations. The absolute nodal coordinate formulation (ANCF) in connection with a continuum-based approach is one way to deal with these systems. The main objective of this work is to extend an existent approach for the modelling of slender structures within the ANCF framework with nonlinear, nearly incompressible materials using the volumetric energy penalty technique. The main part of the study is devoted to the evaluation of multi-layer beam models and simplifications in the locking suppression method based on F-bar projection. The results present significantly better agreement with the reference solution for multi-layer structures built with the standard ANCF beam element as compared with the earlier implementation.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 977-990
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Design of multi-layer sputter-deposited anode to reduce catalyst loading for liquid DMFC
Autorzy:: Saito, H.
Nakashima, T.
Nakase, K.
Sudoh, M.
Powiązania:: https://bibliotekanauki.pl/articles/385244.pdf
Data publikacji:: 2009
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:: liquid DMFC
low catalyst loading
sputter-deposition
multi-layer anode
Opis:: Superior catalyst utilization of direct methanol fuel cells (DMFCs) may be obtained by localized catalyst loading on reaction sites. The objective of this work is to improve the catalyst utilization by multi-layer structure and reduction of loading catalyst. Multi-layer anode consisted of sputter-deposited Pt-Ru catalyst layer and the support layer of Nafion-carbon-Isopropanol ink (NCI). Single layer anode consisted of sputter-deposited Pt-Ru catalyst layer and the layer of carbon-glycerin ink (CG). Multi-layer (1~4 layers) and single-layer (0.04, 0.10 and 0.24 mg cm-2) were evaluated by using electrochemical measurement and SEM images. Three-layer anode provided 50.9 W g-1, 3.4 times as mass activity of conventional paste method anode. Methanol residues stripping voltammetry revealed that electrochemical surface area (ECSA) was increased with the number of layers. Additionally, single-layer anode (0.04 mg cm-2) provided over 150 W g-1. These results suggested that reduction of loading catalyst per unit layer and multilayer structure enhanced catalyst utilization.
Źródło:: Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 175-178
1897-8649
2080-2145
Pojawia się w:: Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Numerical analysis of thick, multi-layered composite girders using hybrid-stress finite elements
Autorzy:: Gołaś, J.
Powiązania:: https://bibliotekanauki.pl/articles/279671.pdf
Data publikacji:: 2001
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: multi-layer composite
transverse inhomogeneity
hybrid-stress finite element
numerical analysis
Opis:: This paper presents an of numerical solutions for multi-layer composite girders under static loading. In the algorithms of presented solutions the hybrid-stress model of the finite element method based on Reissner's modified variational functional was used. Two version of numerical programs were developed for an N-layer finite element. The programs were tested on the example of three-layer laminated beam of carbon fibre-reinforced epoxy composite, as well as on the example of numerical solution for a cantilevered plate. In addition, numerical examples concerning laminated glued timber beams and a retaining wall of reinforced soil were analysed.
Analiza numeryczna grubych wielowarswowych dźwigarów kompozytowych z wykorzystaniem hybrydowo-naprężeniowych elementów skończonych. W pracy przedstawiono analizę rozwiązań numerycznych dla grubych wielowarstwowych dźwigarów kompozytowych obciążonych statycznie. W algorytmach rozwiązań wykorzystano hybrydowy model naprężeniowy metody elementów skończonych bazujący na zmodyfikowanym funkcjonale wariasyjnym Reissnera. Opracowano dwie wersje programu numerycznego dla elementu skończonego o N warstwach. Programy przetestowano na przykładzie trójwarstwowej belki z laminatu kompozytowego (z epoksydu wzmocnionego włóknami węglowymi) oraz na przykładzie rozwiązania numerycznego dla tarczy wspornikowej. Analizowano ponadto konkretne przykłady liczbowe dotyczące belek z drewna klejonego warstwowo oraz konstrukcji muru oporowego z gruntu zbrojonego.
Źródło:: Journal of Theoretical and Applied Mechanics; 2001, 39, 2; 283-296
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: A solution to the problem of time-fractional heat conduction in a multi-layer slab
Autorzy:: Siedlecka, U.
Kukla, S.
Powiązania:: https://bibliotekanauki.pl/articles/122925.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:: heat conduction
fractional derivative
multi-layer slab
przewodnictwo ciepła
pochodna ułamkowa
Opis:: In this paper a solution of the time-fractional heat conduction problem in a multilayer slab is presented. The boundary conditions of the third kind and the perfect contact at the interfaces are assumed. A space-time dependent volumetric heat source in the slab and time dependent surroundings temperatures are taken into account in the formulation of the problem. The solution is obtained in the form of a series expansion with respect to eigenfunctions of an auxiliary problem. A numerical example shows temperature distribution in the slab for various values of the order of the Caputo fractional derivative in the heat conduction equation.
Źródło:: Journal of Applied Mathematics and Computational Mechanics; 2015, 14, 3; 95-102
2299-9965
Pojawia się w:: Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Experimental investigations of the protective shield - protected plate - test stand system under blast shock wave
Autorzy:: Klasztorny, M.
Niezgoda, T.
Panowicz, R.
Gotowicki, P.
Powiązania:: https://bibliotekanauki.pl/articles/247769.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: light armoured vehicles
protective shields
multi-layer shields
range tests
validation
Opis:: The study presents preliminary experimental range tests of a system for testing protective shields for light armoured vehicles. The shields are designed against HE mines and IEDs up to 10 kg TNT. The system consists of the multiple-use portable range stand, a protected Armox 500T plate and a protective shield. The latter consists of the following main layers: PA11 aluminum, the SCACS hybrid laminate, ALPORAS aluminum foam, and the SCACS hybrid laminate. The layers are connected together with SOUDASEAL chemo-set glue. Overall dimensions of the test stand are ~ 800x800x180 mm, the protected plate has dimensions 650x650x5 mm, and a protective shield is of 450x450x76 mm dimensions. The system rests on a St3 steel plate stiffening the range subsoil. The range stand designed to be resistant up to 10 kg TNT blasts is composed of three appropriately shaped rigid frames connected with six high strength erection bolts. The explosive charge is suspended centrally at 400 mm distance from the top surface of the stand. Two range tests have been performed, i.e.: 1) the protected plate without a protective shield under 2 kg TNT blast shock wave, 2) the protected plate with the protective shield under 2 kg TNT blast shock wave. The effectiveness of the protective shield is assessed via comparing the maximum plastic deflection of the protected plate in both systems. The experimental results have been used to validate the FE model of the system.
Źródło:: Journal of KONES; 2010, 17, 4; 229-236
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Rakushechny Yar site: lacustrine and fluvial deposits, buried soils and shell platforms from 6th mill. BC
Autorzy:: Dolbunova, Ekaterina
Szmańda, Jacek
Kittel, Piotr
Kulkova, Marianna
Aleksandrovskiy, Alexander
Cywa, Katarzyna
Mazurkevich, Andrey
Powiązania:: https://bibliotekanauki.pl/articles/1366033.pdf
Data publikacji:: 2020-12-24
Wydawca:: Łódzkie Towarzystwo Naukowe
Tematy:: Neolithic
flood-plain multi-layer site
sedimentology
buried soils
shell platforms
Opis:: The Rakushechny Yar site is a floodplain multi-layer archaeological site encompassing strata dated from the Early Neolithic to the Bronze Age. It is characterised by a complex stratigraphy, with the presence of different deposits, buried soils and archaeological layers. Fluvial deposits interlay different settlement strata, which provides an opportunity to elaborate a precise chronological scheme and to study the successive changes in hydrological regime, climate and vegetation, along with the phases of human occupation. A study of the pastes used in ceramic manufacture was conducted to investigate changes in the procuring of raw materials, whose procurement would have depended heavily on their availability and sedimentation process. The fluvial deposits, which have safely preserved the Neolithic–Bronze Age archaeological layers, reach thicknesses of more than 6 m, which makes this site interesting both for the reconstruction of the human–environmental interaction and for the palaeoenvironmental history of the region.
Źródło:: Acta Geographica Lodziensia; 2020, 110; 61-80
0065-1249
Pojawia się w:: Acta Geographica Lodziensia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Conversion of compression test data into flow curve, accounting for barrelling
Autorzy:: Khoddam, Shahin
Hodgson, Peter D.
Powiązania:: https://bibliotekanauki.pl/articles/29520227.pdf
Data publikacji:: 2021
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: compression test
flow curve identification
barrelling induced shear
multi-layer
slab analysis
Opis:: Current solutions to convert the axis-symmetric compression test (ACT) data to flow data ignore the barrelling deformation in the sample. This work presents a solution for the test which accounts for the sample’s barrelling by discretising it into a finite number of layers of different radii. The solution assumes a constant and sliding friction at the anvil-sample interface. The sample’s flow behaviour is identified by combining a recent kinematic solution of the test, Prandtl–Reuss–Mises’s equations and a slab-analysis of the layers. It also involves an averaging of the effective plastic stresses developed in the individual layers. The solution is verified for a special case of no-barrelling which matches the currently used solution.
Źródło:: Computer Methods in Materials Science; 2021, 21, 3; 157-162
2720-4081
2720-3948
Pojawia się w:: Computer Methods in Materials Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Developing a data-driven soft sensor to predict silicate impurity in iron ore flotation concentrate
Autorzy:: Pural, Yusuf Enes
Powiązania:: https://bibliotekanauki.pl/articles/24148677.pdf
Data publikacji:: 2023
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: soft sensor
machine learning
random forest
multi-layer perceptron
flotation
grade estimation
Opis:: Soft sensors are mathematical models that estimate the value of a process variable that is difficult or expensive to measure directly. They can be based on first principle models, data-based models, or a combination of both. These models are increasingly used in mineral processing to estimate and optimize important performance parameters such as mill load, mineral grades, and particle size. This study investigates the development of a data-driven soft sensor to predict the silicate content in iron ore reverse flotation concentrate, a crucial indicator of plant performance. The proposed soft sensor model employs a dataset obtained from Kaggle, which includes measurements of iron and silicate content in the feed to the plant, reagent dosages, weight and pH of pulp, as well as the amount of air and froth levels in the flotation units. To reduce the dimensionality of the dataset, Principal Component Analysis, an unsupervised machine learning method, was applied. The soft sensor model was developed using three machine learning algorithms, namely, Ridge Regression, Multi-Layer Perceptron, and Random Forest. The Random Forest model, created with non-reduced data, demonstrated superior performance, with an R-squared value of 96.5% and a mean absolute error of 0.089. The results suggest that the proposed soft sensor model can accurately predict the silicate content in the iron ore flotation concentrate using machine learning algorithms. Moreover, the study highlights the importance of selecting appropriate algorithms for soft sensor developments in mineral processing plants.
Źródło:: Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 169823
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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