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Wyszukujesz frazę "multi-layer" wg kryterium: Temat


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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Application of Water Quality Index and Multivariate Statistical Techniques to Assess and Predict of Groundwater Quality with Aid of Geographic Information System
Autorzy:
Dawood, Ammar S.
Jabbar, Mushtak T.
Al-Tameemi, Hayfaa H.
Baer, Eric M.
Powiązania:
https://bibliotekanauki.pl/articles/2105290.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
cluster analysis
water quality
groundwater
factor analysis
WQI
GIS
multi-layer perceptron
Opis:
In this study, the groundwater quality and spatial distribution of the Basra province in the south of Iraq was assessed and mapped for drinking and irrigation purposes. Groundwater samples (n = 41) were collected from deep wells in the study area to demonstrate, estimate and model the Water Quality Index (WQI). The analysis of water samples integrated with GIS-based IDW technique was used to express the spatial variation in the study area with consideration of WQI. The physicochemical parameters, including pH, sodium (Na+), electrical conductivity (EC), chloride (Cl-), total dissolved solids (TDS), calcium (Ca2+), nitrate (NO3-), sulfate (SO42-), magnesium (Mg2+), and bicarbonate (HCO3-) were identified for groundwater quality assessment. The results of calculated WQI classify groundwater into three sorts. The results of WQI showed that 2.5%, 2.5% and 95% of the groundwater samples were classified as poor/very poor/unsuitable for drinking, respectively. The GIS tools integrated with statistical techniques are utilized for spatial distribution and description of water quality. Correlation analysis of groundwater data revealed that some parameters have actually a relationship that is strong with the other parameters and they share a common source of origin. Multivariate statistical techniques, especially cluster analysis (CA) and factor analysis (FA), were applied for the evaluation of spatial variations of forty-one selected groundwater samples. Cluster analysis confirmed that some different locations of wells have comparable sourced elements of water pollution, whereas factor analysis yielded three factors which are accountable for groundwater quality variations, clarifying more than 72% of the total variance of the data and permitted to group the preferred water quality. MultiLayer Perceptron (MLP) models were applied in modeling the water quality index. Comparing different result values of the MLP network suggested that the values of MSE and r for the selected model are 0.1940 and 0.9998, respectively. Finally, it can be revealed that the MLP network precisely predicted the output, i.e. the WQI values.
Źródło:
Journal of Ecological Engineering; 2022, 23, 6; 189--204
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorpcja pary wodnej przez ciastka biszkoptowe wielowarstwowe
Water vapour adsorption by multi-layer biscuits
Autorzy:
Janowicz, M.
Lenart, A.
Sikora, K.
Powiązania:
https://bibliotekanauki.pl/articles/287844.pdf
Data publikacji:
2007
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
ciastko biszkoptowe
para wodna
adsorpcja
przechowywanie
multi-layer biscuits
storage
water vapour
adsorption
Opis:
Celem pracy było zbadanie kinetyki oraz szybkości adsorpcji pary wodnej przez ciastka biszkoptowe wielowarstwowe z uwzględnieniem rodzaju wypełnienia oraz jego składu. Badania wykazały, że rodzaj wypełnienia ciastek biszkoptowych wielowarstwowych ma wpływ na ich właściwości sorpcyjne w czasie przechowywania, a stopień tego wpływu jest uzależniony jest zarówno od składu wypełnienia jak i od aktywności wody środowiska w czasie ich przechowywania.
The purpose of the work was testing the kinetics and water vapour adsorption rate for multilayer biscuits considering the type of fill and its composition. The tests demonstrated that type of multilayer biscuit fill had effect on buiscit sorptive properties during storage, and degree of this effect depends both from fill composition and water activity of the environment during storage.
Źródło:
Inżynieria Rolnicza; 2007, R. 11, nr 5 (93), 5 (93); 205-211
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical investigation of the deep drawing process for an automobile panel and prediction of appropriate amount of parameters by multi-layer neural network
Autorzy:
Najafabadi, S. S.
Anaraki, A. T.
Moradi, M.
Powiązania:
https://bibliotekanauki.pl/articles/281868.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
deep drawing
finite element analysis (FEA)
multi-layer artificial neural network (ANN)
Taguchi design
Opis:
In this paper, the deep drawing process of an automobile panel in order to select the appropriate amount of parameters has been investigated. The parameters include friction between the blank and die, blank width and length, blank thickness and gap between the blank and blank-holder. A multi-layer artificial neural network (ANN) trained by finite element analyses (FEA) is applied in order to improve forming parameters and achieve a better quality. As the FEA results are used to train the ANN, the FEA results have been verified by three experiments. Finally, an appropriate amount of each parameter is predicted by the trained ANN and a FEA has been done based on the ANN prediction to evaluate the accuracy of the trained ANN. Moreover, it is shown that the ANN could predict results within a 10 percent error. In addition, the proposed method for prediction of the appropriate parameters (ANN) is confirmed by comparing with the Taguchi design of experiment prediction. It is also shown that the model obtained by the former method has lower errors than the latter one. In this study, the Taguchi model is used to evaluate the effect of parameters on tearing and wrinkling. Based on the Taguchi design of experiment, while the blank length is the most effective parameter on tearing, the maximum height of wrinkles on flanged parts mainly depends on the blank thickness.
Źródło:
Journal of Theoretical and Applied Mechanics; 2017, 55, 2; 707-718
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Macroscopic Properties of Filler Metal (BCuP-5) on Cu-plate using Laser Cladding Process
Autorzy:
Lee, Kee-Ahn
Park, Joo Hyun
Joo, Yeun Ah
Powiązania:
https://bibliotekanauki.pl/articles/352063.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
laser cladding
BCuP-5(Cu-15Ag-5P)
microstructure
switching device
multi-layer
Opis:
This study stacked a thin, dense BCuP-5 (Cu-Ag-P based filler metal) on a Cu-plate using the laser cladding (L.C) process to develop a method to manufacture Ag reducing multilayer clad electrical contact material with an Ag-M(O)/Ag/Cu/BCuP-5 structure. Then, the microstructure and macroscopic properties of the manufactured BCuP-5 coating layer were analyzed. The thickness of the manufactured coating layer was approximately 1.7 mm (maximum). Microstructural observation of the coating layer identified Cu, Ag and Cu-Ag-Cu3P ternary eutectic phases like those in the initial BcuP-5 powder. To evaluate the properties of the manufactured coating layer, hardness and adhesion strength tests were performed. The average hardness of the laser cladded coating layer was 183.2 Hv, which is 2.6 times greater than conventional brazed BcuP-5. The average pull-off strength measured using the stud pull test was 341.6 kg/cm2. Cross-sectional observation of the pulled-off material confirmed that the coating layer and substrate maintained a firm adhesion after pull-off. Thus, the actual adhesion strength of Cu/BcuP-5 was inferred to be greater than 341.6 kg/cm2. Based on the above findings, it was confirmed that it is possible to manufacture a sound Ag reducing multilayer clad electrical contact material using the laser cladding process.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 2; 559-563
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of a neural statistical model for the prediction of relative humidity levels in the region of Rabat-Kenitra, North West Morocco
Autorzy:
El Azhari, Kaoutar
Abdallaoui, Badreddine
Dehbi, Ali
Abdalloui, Abdelaziz
Zineddine, Hamid
Powiązania:
https://bibliotekanauki.pl/articles/2174362.pdf
Data publikacji:
2022
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
artificial neural network
ANN
learning algorithm
multi-layer perceptron
MLP
modelling
Rabat-Kenitra
relative humidity
Opis:
This article accounts for the development of a powerful artificial neural network (ANN) model, designed for the prediction of relative humidity levels, using other meteorological parameters such as the maximum temperature, minimum temperature, precipitation, wind speed, and intensity of solar radiation in the Rabat-Kenitra region (a coastal area where relative humidity is a real concern). The model was applied to a database containing a daily history of five meteorological parameters collected by nine stations covering this region from 1979 to mid-2014. It has been demonstrated that the best performing three-layer (input, hidden, and output) ANN mathematical model for the prediction of relative humidity in this region is the multi-layer perceptron (MLP) model. This neural model using the Levenberg-Marquard algorithm, with an architecture of [5-11-1] and the transfer functions Tansig in the hidden layer and Purelin in the output layer, was able to estimate relative humidity values that were very close to those observed. This was affirmed by a low mean squared error (MSE) and a high correlation coefficient (R), compared to the statistical indicators relating to the other models developed as part of this study.
Źródło:
Journal of Water and Land Development; 2022, 54; 13--20
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of ballistic resistance of adhesive bonded multi-layer structures
Badania odporności na przebicie klejonych struktur wielowarstwowych
Autorzy:
Godzimirski, J.
Rośkowicz, M.
Komorek, A.
Powiązania:
https://bibliotekanauki.pl/articles/1365620.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
połączenie klejowe
materiał wielowarstwowy
lekka osłona balistyczna
adhesive joint
multi layer materials
light-weight ballistic armour
Opis:
Celem badań była ocena możliwości zastosowania opracowanych struktur wielowarstwowych do wytwarzania lekkich pancerzy, mogących znaleźć zastosowanie jako kuloodporne osłony balistyczne śmigłowców bojowych i innego lekkiego sprzętu wojskowego. Istotnym celem badań było również sprawdzenie możliwości łączenia metodą klejenia ceramiki typu SiC i Al2O3 z antybalistycznymi tkaninami polietylenowymi i aramidowymi. Odporność na przebicie była badana z wykorzystaniem stanowiska z działem helowym i ultraszybką kamerą. W wyniku przeprowadzonych badań stwierdzono, iż pakiety luźnych tkanin aramidowych charakteryzuje większa odporność na przebicie w porównaniu z kompozytami polimerowymi wytworzonymi z takich tkanin oraz kompozytami warstwowymi złożonymi z cienkich warstw metalowych i tkanin aramidowych. Ponadto zauważono, że warstwy ceramiczne znacznie zwiększają odporność na przebicie osłon balistycznych i ich stosowanie w takich osłonach wydaje się niezbędne oraz, że wklejenie płytek ceramicznych pomiędzy dwie cienkie blachy ze stopu aluminium i nie łączenie ich bezpośrednio z tkaninami aramidowymi zapewnia w przypadku uderzenia pociskiem zniszczenie małej powierzchni warstwy ceramicznej, a więc w małym stopniu zmniejsza właściwości ochronne osłony.
The aim of the study was to evaluate the possibility of using multilayer structures for light armour, in which the elements of the ceramic type SiC and Al2O3 were bonding by adhesive joins with antiballistic polyethylene and aramid fabrics. Ballistic resistance shells was determined using for this purpose the test stand constructed on the basis of helium gun and high-speed camera. It has been shown that the laminated structure composed of thin metal layers and aramid fabrics as well as polymer composites made of aramid fabric has lower ballistic resistance than loose fabric packs. It was also demonstrated the functionality of the use of the ceramic component as a separate package, which the ceramic plates are adhesive bonded between the two layers of sheet metal. There is also evidence that fabrics composed of thin layers of material poorly connected with each other, should not be adhesively bonded to the ceramic. It proposed the preparation of specimens, which best reconstruct the load of ceramic plates adhesive bonded to fabric, which are made of lightweight bulletproof vests and ballistic panels.
Źródło:
Eksploatacja i Niezawodność; 2017, 19, 3; 324-330
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An analysis of selected traits of typical supply of oak logs and a comparison of the efficiency of their processing into flooring
Autorzy:
Rębkowski, Bartłomiej
Koczan, Grzegorz
Kozakiewicz, Paweł
Krzosek, Sławomir
Powiązania:
https://bibliotekanauki.pl/articles/2200218.pdf
Data publikacji:
2020
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
wood raw material
European oak wood
wood flooring
multi-layer parquet elements
X-ray computed tomography
Opis:
An analysis of selected traits of typical supply of oak logs and a comparison of efficiency of their processing into flooring. The research was performed on typical supply of oak wood logs of WC02 class, diameter from 29 to 34 cm, measured in the middle of its length (full log length 2.3 m). Wood came from Bobolice forest district, Lubowo forest subdistrict. This type of raw wood is used in standard machining processes (sawing) of multi-layer flooring face layer (top layer, lamella). The application of X-ray computed tomography allows to perform full valuation of raw material quality. The introduction of partially chip-less machining technology leads to significant savings in wood in comparison with standard machining (sawing).
Analiza wybranych cech typowej dostawy kłód dębowych oraz porównanie wydajności ich przerobu na materiały podłogowe. Badania przeprowadzono na drewnie dębowym WC02 o średnicy w połowie długości bez kory od 29 do 34 cm i długości 2,3 m z Nadleśnictwa Bobolice, Leśnictwa Lubowo (reprezentatywny surowiec). Tego typu surowiec jest stosowany w standardowej technologii obróbki wiórowej przy wytwarzaniu warstw licowych (lameli) desek warstwowych. W pracy przeanalizowano jak wpłynęłaby na wydajność ilościową, zamiana technologii na częściowo bezwiórową. Zastosowanie obróbki częściowo bezwiórowej pozwala na zaoszczędzenie znaczących ilości surowca. Straty przy obróbce częściowo bezwiórowej w odniesieniu do całej kłody dębowej mogą być o ok. 15 punktów procentowych niższe niż w przypadku obróbki wiórowej. W odniesieniu do pryzmy różnica wielkości strat może wynosić nawet do 31 punktów procentowych. Sama analiza ilościowa nie daje odpowiedzi o celowości wprowadzania nowej technologii, bowiem nie uwzględnia wielu czynników np.: energochłonności obróbki hydrotermicznej niezbędnej przy skrawaniu. Równie istotna jest jakość pozyskiwanych lameli dębowych, co było przedmiotem analiz w innej pracy.
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2020, 109; 92--102
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-Layer Perceptron Neural Network Utilizing Adaptive Best-Mass Gravitational Search Algorithm to Classify Sonar Dataset
Autorzy:
Mosavi, Mohammad Reza
Khishe, Mohammad
Naseri, Mohammad Jafar
Parvizi, Gholam Reza
Ayat, Mehdi
Powiązania:
https://bibliotekanauki.pl/articles/176971.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
MLP NN
Multi-Layer Perceptron Neural Network
ABGSA
Adaptive Best Mass Gravitational Search Algorithm
sonar
classification
Opis:
In this paper, a new Multi-Layer Perceptron Neural Network (MLP NN) classifier is proposed for classifying sonar targets and non-targets from the acoustic backscattered signals. Besides the capabilities of MLP NNs, it uses Back Propagation (BP) and Gradient Descent (GD) for training; therefore, MLP NNs face with not only impertinent classification accuracy but also getting stuck in local minima as well as lowconvergence speed. To lift defections, this study uses Adaptive Best Mass Gravitational Search Algorithm (ABGSA) to train MLP NN. This algorithm develops marginal disadvantage of the GSA using the bestcollected masses within iterations and expediting exploitation phase. To test the proposed classifier, this algorithm along with the GSA, GD, GA, PSO and compound method (PSOGSA) via three datasets in various dimensions will be assessed. Assessed metrics include convergence speed, fail probability in local minimum and classification accuracy. Finally, as a practical application assumed network classifies sonar dataset. This dataset consists of the backscattered echoes from six different objects: four targets and two non-targets. Results indicate that the new classifier proposes better output in terms of aforementioned criteria than whole proposed benchmarks.
Źródło:
Archives of Acoustics; 2019, 44, 1; 137-151
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the cooling method on shortening the cycle of multi-layer arc-surfacing of thin walls
Wpływ sposobu chłodzenia na skrócenie cyklu wielowarstwowego napawania łukowego cienkich ścian
Autorzy:
Cegielski, Paweł
Grześ, Jarosław
Łacisz, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/115137.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
napawanie łukowe wielowarstwowe
ściana cienka
drukowanie 3d
multi-layer arc hardfacing
thin wall
3D printing
Opis:
The use of 3D printing methods in the industry is becoming more frequent and popular. It brings specific economic effects, enables quick and precise production of machine parts and devices. The article presents a fragment of research carried out in the Welding Engineering Department of the Warsaw University of Technology on the application of MAG arc welding for 3D printing. The MAG method was used to try to produce thin walls. The aim of the presented research was to determine the effect of the cooling method on shortening the time of manufacturing the 3D model of thin walls. The models were made using G3Si1 and 316LSi electrode wires. In the first part of the research, an interpass temperature of 50 °C, 100 °C and 150 °C, achieved by free cooling was adopted. In the second part, the interpass temperature was 100 °C and was achieved by forced cooling with a copper plate, a fan and a stream of compressed air. The greatest reduction in the time of manufacturing the 3D model of a thin wall was obtained for cooling using compressed air.
Wykorzystanie w przemyśle metod drukowania 3D jest coraz częstsze i popularniejsze. Przynosi konkretne efekty ekonomiczne, umożliwia szybkie i precyzyjne wytwarzanie części maszyn i urządzeń. W artykule przedstawiono fragment badań prowadzonych w Zakładzie Inżynierii Spajania Politechniki Warszawskiej nad zastosowaniem napawania łukowego metodą MAG do drukowania 3D. Metodę MAG wykorzystano do prób wytwarzania cienkich ścian. Celem prezentowanych badań było określenie wpływu sposobu chłodzenia na skrócenie czasu wytwarzania modelu 3D cienkich ścian. Modele wykonano stosując druty elektrodowe G3Si1 i 316LSi. W pierwszej części badań przyjęto temperaturę międzyściegową równą 50 °C, 100 °C i 150 °C, osiąganą poprzez chłodzenie swobodne. W drugiej części temperatura międzyściegowa wynosiła 100 °C i osiągana była drogą wymuszonego chłodzenia za pomocą płyty miedzianej, wentylatora i strumienia sprężonego powietrza. Największe skrócenie czasu wytwarzania modelu 3D cienkiej ściany otrzymano dla chłodzenia za pomocą sprężonego powietrza.
Źródło:
Welding Technology Review; 2019, 91, 1; 13-18
0033-2364
2449-7959
Pojawia się w:
Welding Technology Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mehatronnaa sistema s magnitokommutacionnoi masinoi
System mechatroniczny silnikow wielotarczowych z komutacją magnetyczną
Autorzy:
German-Galkin, S.
Hrynkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/359122.pdf
Data publikacji:
2009
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
system mechatroniczny
silniki elektryczne wielotarczowe
komutacja magnetyczna
mechatronic system
multi-layer disc electric motor
magnetic flux commutation
Opis:
Artykuł omawia budow. silnikow wielotarczowych z komutacją magnetyczną. Opisano w nim cechy strukturalne silnika, dokonano analizy systemu mechatronicznego oraz przedstawiono wyniki symulacji.
The paper deals with construction of multi-layer disc electric motor with magnetic flux commutation. The features of structure electric motor are shown, the analysis of mechatronic system is fulfilled, the simulation results are presented.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2009, 19 (91); 39-46
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł

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