Wyniki wyszukiwania - BazTech

1

Zintegrowane podejście do wyboru optymalnej serii zapraw tynkarskich do izolacji

Demir Abdullah

Cement Wapno Beton

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2022

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R. 27, nr 1

32--44

PL

W niniejszym artykule zaproponowano metodę Taguchiego do rozwiązania hierarchicznej analizy problemu decyzyjnego [Analytic Hierarchy Process - AHP] oraz metodę Simple Additive Weighting [SAW] w celu znalezienia optymalnej serii zapraw tynkarskich do izolacji, w oparciu o wiele kryteriów. Najpierw zastosowano metodę Taguchi w celu określenia planu eksperymentu z czynnikami: cementem, wapnem, dolomitem i perlitem na trzech poziomach dozowania, dla każdego z nich z ortogonalnym planem L9. Następnie, zgodnie z projektem, przeprowadzono eksperymenty metodą ultradźwiękową, określono wytrzymałość na ściskanie, przyczepność, nasiąkliwość kapilarną i przewodność cieplną. Wagi ważności kryteriów uzyskano metodą AHP, a punktację poszczególnych serii obliczono metodą SAW. Na podstawie wyników uzyskano optymalne poziomy czynników i otrzymano optymalne składy.

EN

In this study, an integrated approach by Taguchi, Analytic Hierarchy Process [AHP] and Simple Additive Weighting [SAW] method was proposed to find out the optimal insulation plaster mortar series, based on multiple criteria. Firstly, Taguchi method was applied to define the experimental design plan, with the factors of cement, lime, dolomite and perlite in three levels for each with L9 orthogonal design. Then, ultrasonic pulse velocity, compressive strength, bond strength, capillarity water absorption and thermal conductivity experiments, were made according to the design. The importance weights of criteria were obtained by AHP and the scores of the series were calculated by SAW method. The factors’ optimum levels were obtained based on the scores and the optimal series was proposed.

2

High-performance methods for welding steel P460NL2

Kempa Marcin

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2021

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Vol. 65, No. 3

21--28

EN

The article discusses comparative test results concerning two welding methods, i.e. SAW and MAG. The tests involved the making of welded joints in steel P460NL2, the verification of the chemical composition of supplied steel, the comparison of the quality of joints (in accordance with PN-EN ISO 5817) as well as the performance of macroscopic tests and the comparison of mechanical properties and hardness.

PL

W artykule opisano wyniki badań dotyczących porównania dwóch metod spawania, tj. SAW i MAG. Badania wykonano na przykładzie wykonania złączy spawanych blach ze stali ciśnieniowej P460NL2. W trakcie przeprowadzania badań skontrolowano skład chemiczny dostarczonej stali, porównano poziom jakości wykonanych złączy wg PN-EN ISO 5817, wykonano badania makroskopowe, porównano własności mechaniczne i twardość.

3

Assessment of airside aerodrome infrastructure by SAW method with weights from Shannon's interval entropy

Żak Jolanta, Gołda Paweł, Cur Krzysztof, Zawisza Tomasz

Archives of Transport

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2021

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Vol. 60, iss. 4

171--185

EN

Multi-criteria decision support (MCDM) methods are widely used in many areas of science. This applies to economic, social and technical sciences. Implementing activities at the strategic, tactical or operational level requires appropriate tools to support decision-makers. The use of these tools requires the preparation of a decision model along with the formalization of the goal and the acquisition and preparation of data to make the decision accurate. Due to the wide application of MCDM in engineering practice, the article presents their application in air transport. It is an area that is constantly evolving, and all decisions at the strategic level have long-term effects and must be adequately justified. In the paper a compartmental extension of the classical SAW method with weights obtained using the compartmental Shannon entropy was proposed. This paper presents issues concerning the choice of airport layout and describes the problems that occur in determining the cost and capacity of airports. This paper reviews the literature on airport capacity and operations and airside air transport processes and the application of various multi-criteria decision support methods to airport problems. The main part of the article contains an optimization mathematical model aimed at determining the parameters of the elements comprising the airport, on the basis of which a simulation model was developed and a modified method of multi-criteria evaluation of SAW taking into account the interval numbers was presented, in which the set of weights was estimated by the Shannon entropy method. In the application part for 3 variants of the airport arrangement, the parameters were determined in the form of interval numbers and then evaluated using the presented method. The presented numerical example shows that the proposed method is an excellent tool to assist in solving complex decision problems where the data are imprecise and represented by interval numbers.

4

Finite Element Analysis of SAW Sensor with ZnO Substrate for Dichloromethane (DCM) Gas Detection

Moustafa Mohamed, Laouini Ghaylen, Alzoubi Tariq

Archives of Acoustics

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2021

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Vol. 46, No. 3

419--426

EN

A SAW gas sensor based on Zinc Oxide (ZnO) piezoelectric substrate is simulated and evaluated for the detection of the dichloromethane (DCM) volatile organic compound (VOC). The study is performed based on the finite element method (FEM) using COMSOL Multiphysics software. The obtained device response using the ZnO substrate is compared to the one using the typical lithium niobate (LiNbO3) piezoelectric substrate. A thin film of polyisobutylene (PIB) membrane is selected to act as the sensing layer. The obtained results reveal a linear behaviour of the resonance frequency downshift (i.e., the sensor sensitivity) versus the investigated gas concentrations varying from 10 ppm to 100 ppm of DCM gas. Additionally, the sensor response is investigated by applying several thicknesses of PIB ranging from 0.3 µm to 1.0 µm. The observed sensor response shows less dependence on the PIB thickness using the ZnO substrate than the LiNbO3 one.

5

The performance assessment of reverse osmosis stations at Al-Mahalabea area

Ahmed Mohammed F.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2020

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Vol. 29, No. 3

332--342

EN

The present study assesses RO stations at four sites in Al-Mahalabea area – Nineveh governorate, Iraq during the summer of 2013. The performance of RO stations are ranked by two methods: the Simple Additive Weight (SAW) and the Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS). Two groups of samples were collected from feed and permeate water for two periods (at zero time of operation and after ten weeks of operation) with eleven parameters for each sample were analysed. The highest overall rejection R efficiency appeared with the first set of parameters more than 90% (SO4, TDS, NO3, TH, and turbidity), while the second set was the least (Cl, Na, and total alkalinity – TA) ranged between 65 and 85%. It is observed that both the SAW and the TOPSIS methods are accurate to predict the performance efficiency.

6

GIS based modeling of GWQ assessment at Al-Shekhan area using AHP and SAW techniques

Ahmed Mohammed F., Faisal Raid M.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

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2020

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Vol. 29, No. 2

172--183

EN

There is a continuous need to assess Groundwater Quality (GWQ) for human beneficial uses especially in areas suffering a shortage of nearby surface water. This study aims to assess GWQ of 56 wells located at Al-Shekhan area for drinking, irrigation, and livestock purposes. Analytical Hierarchical Process (AHP) technique is used to extract weights of parameters that are needed in the calculation of Simple Additive Weighting (SAW) technique. Maps are created using Geographical Information Systems (GIS), and these maps shows the classes of suitable areas for each purpose depending upon the calculated indices which are extracted from SAW technique. The results show that the final map classifies the suitable parts according to the drinking, irrigation and livestock purposes, and it shows that the north eastern part of the studied area is suitable for irrigation and livestock only. A model of GIS and AHP is built to assess the suitability of GWQ in Al-Shekhan area, and can be a raw model to be applied to assess GWQ in any other area after inserting the values of their parameters.

7

Welding thermal cycles of joints made of S1100QL steel by saw and hybrid plasma-mag processes

Sajek A.

Advances in Materials Science

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2020

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Vol. 20, nr 4(66)

75--86

EN

The aim of this article is to validate the method of conducting a multipoint temperature measurement in the area of welded joints as a tool for quality assessment of the joints in question. In order to establish a relationship between temperature readout at a given point, the value of heat input and the distance of the point form the weld axis, preliminary tests have been conducted on a set of padding welds. Correlation of measurement data analysis showed the high 0.99 level. In the second stage of the study, temperatures of joints welded with two different methods have been measured: the HPAW (Hybrid Plasma – Arc Welding) and classic SAW (Submerged Arc Welding) method. The obtained temperature curves reflect the intensity of heat input in a given welding process. When compared to thermal effects on metallographic specimens, the shapes of the curves show a potential for quality assessment of joints in production conditions. Estimating thermal effects with classic analytical methods proves imprecise with respect to advanced high-power welding processes. Monitoring temperature will allow to assess the quality of joints in the course of welding, which may be a remarkable factor in terms of limiting the HAZ (heat affected zone) tempering of joints made from MART steels (advanced high strength martensitic steel) – a phenomenon that exceedingly decreases the strength of the joints. The method for quality assessment of welded joints presented in this paper allows to extend the analysis of welding thermal conditions.

8

Akustyczne badania polimeru typu RR-P3HT do wykrywania DMMP w powietrzu

Wrotniak J., Jakubik W., Powroźnik P., Stolarczyk A., Magnuski M.

Przegląd Elektrotechniczny

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2018

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R. 94, nr 6

70--73

PL

W artykule przedstawiono wstępne badania z wykorzystaniem metody z akustyczną falą powierzchniową (AFP) do wykrywania w mieszaninie powietrza śladowych ilości cząsteczek DMMP (Dimetylometylofosforan), który jest powszechnie wykorzystywany do symulacji obecności sarinu - gazu bojowego z grupy BŚT (Bojowe Środki Trujące). Elementem sensorowym jest warstwa polimeru fotoprzewodzącego poli(3- heksylotiofenu) typu regioregularnego ((RR) -P3HT) wytworzona metodą rozpylania w powietrzu na powierzchnię modułu z AFP. Istotnym czynnikiem wykrywania DMMP było oświetlanie badanego polimeru za pomocą światła białego niewielkiej lampy żarowej.

EN

This paper presents the preliminary investigations using the SAW method for the detection of trace amounts of DMMP molecules (Dimethylmethylphosphate) in air mixtures, which is commonly used to simulate the presence of warfare agents like sarin gas. The sensor element is a layer of photoconductive polymer poly(3-hexylphosphate) of regioregular type ((RR)-P3HT) produced by airborne sputtering on the free surface of the SAW module. An important factor enhancing the ability of DMMP detection was lighting of the polymer by means of a white light of a small incandescent lamp.

9

Assessment of technological usefulness of panel production line in shipbuilding process

Urbański T., Graczyk T., Taraska M., Iwańkowicz R.

Polish Maritime Research

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2018

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S 1

134--144

EN

This paper presents assessment of technological usefulness of panel production line in prefabrication process of large ship hull sections, in which special attention is paid to producibility of welding operations. Basing on the assessment these authors worked out hierarchy of analyzed sequences of welding technological processes as well as production line stands used for the processes. The assessment was performed on the basis of analysis of a concept of panel production line based on real production lines functioning in shipbuilding industry, as well as technical documentation of typical hull sections of a multi-purpose ferry. The presented analysis took into account impact of technological - constructional parameters onto producibility of welding process of prefabricated sections. Among these parameters the following were numbered: mass of the sections and number of their elements, total length of welds, labour consumption, material consumption as well as linear heat input in welding operations. On the basis of the achieved results, places which worsen effectiveness of production line operation were identified, as a result it was possible to formulate proposals for modernization of flow prefabrication line for hull sections.

10

Review of Surface Acoustic Wave Sensors for the Detection and Identification of Toxic Environmental Gases/Vapours

Panneerselvam G., Thirumal V., Pandya H. M.

Archives of Acoustics

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2018

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Vol. 43, No. 3

357--367

EN

Detection and identification of toxic environmental gases have assumed paramount importance precisely in the defense, industrial and civilian security sector. Numerous methods have been developed for the sensing of toxic gases in the environment ever since surface acoustic wave (SAW) technology came into existence. Such SAW sensors called electronic nose (E-Nose) sensor use the frequency response of a delay line/resonator. SAW device is focused and given importance. The selective coating between input and output interdigital transducers (IDTs) in the SAW device is responsible for corresponding changes in operating frequency of the device for a specific gas/vapour absorbed from the environment. A suitable combination of well-designed SAW delay lines with selective coatings not only help to improve sensor sensitivity and selectivity but also leads to the minimization of false frequency alarms in the E-Nose sensor. This article presents a comprehensive review of design, development, simulation and modelling of a SAW sensor for potential sensing of toxic environmental gases.

11

Possibilities of renovation functional surfaces of equipments in the mechanical engineering industry

Brezinová Janette, Viňáš Ján, Draganovská Dagmar, Guzanová Anna, Brezina Jakub

Applied Computer Science

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2018

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Vol. 14, no 2

60--68

EN

The paper analyzes the possibilities of increasing the lifespan of rollers in continuous steel casting line. There are analyzed the causes of the surface rollers damage and the impact of degrading factors in metallurgical production. Three types of welding consumable electrodes designed for restoration layers formation applied by SAW surfacing technology were analyzed. There were analyzed microstructure, microhardness and properties of weld clads in tribological conditions.

12

Deposition of Polymer Sensor Films on SAW Surface by Electrospraying Technology

Jasek K., Pasternak M., Grabka M., Neffe S., Zasada D.

Archives of Acoustics

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2017

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Vol. 42, No. 3

507--513

EN

One of the most important problems with regard to the Surface Acoustic Wave (SAW) gas sensors technology is the deposition of chemosensitive films exhibiting desirable chemical and physical properties. The electrospraying technology seems to be a very promising method of the film deposition in this case. It allows the chemosensitive layers to be obtained out of almost any chemicals and their mixtures in a controllable way. The process gives the possibility to generate specific films with properties unattainable if other methods were to be applied. For example, it allows to deposit solutions of polymers and suspensions of solids in polymer solutions which can degrade in the process of thermal evaporation deposition. The paper describes the results of experiments with electrospraying technique in order to obtain Nafion® films. The influence of the process parameters on film sensitivity has been studied.

13

Effect of Linear Energy and Microstructure on the Content of Residual Hydrogen in Welded Joints made of Superduplex Steels

Świerczyńska A., Łabanowski J., Fydrych D.

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2016

|

Vol. 60, No. 5

171--178

PL

Przedstawiono badania nad zawartością wodoru pozostającego w złączach spawanych ze stali superdupleks wykonanych metodami FCAW i SAW. W wyniku zastosowania różnych technologii spawania uzyskano spoiny o różnych mikrostrukturach i zawartości ferrytu. Pomiary zawartości wodoru pozostającego w złączach metodą całkowitego spalania wykazały na jego zróżnicowaną zawartość w materiale rodzimym oraz w badanych spoinach. Stwierdzono, że zawartość wodoru w spoinach stali superdupleks zależy nie tylko od udziału objętościowego mikrostruktur, ale również od ich budowy i energii liniowej spawania.

EN

The article presents tests concerning the content of retained hydrogen present in FCAW and SAW welded joints made of superduplex steel. The use of various welding processes resulted in the obtainment of welds having different microstructures and ferrite contents. Measurements of retained hydrogen present in joints (performed using the complete combustion method) revealed various contents of hydrogen in the base material and in the welds subjected to the tests. It was determined that the content of hydrogen in welds made of superduplex steels depends not only on the volumetric content of microstructures but also on their composition and welding heat input.

14

Numerical Analysis of Sensitivity of SAW Structure to the Effect of Toxic Gases

Hejczyk T., Pustelny T., Wszołek B., Jakubik W., Maciak E.

Archives of Acoustics

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2016

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Vol. 41, No. 4

747--755

EN

The paper presents the results of numerical analysis of the SAW gas sensor in the steady and non-steady states. The effect of SAW velocity changes vs surface electrical conductivity of the sensing layer is predicted. The conductivity of the porous sensing layer above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the layer. The Knudsen’s model of gas diffusion was used. Numerical results for the effect of gas CH4 on layers: WO3, TiO2, NiO, SnO2 in the steady state and CH4 in the non-steady state in recovery step in the WO3 sensing layer have been shown. The main aim of the investigation was to study thin film interaction with target gases in the SAW sensor configuration based on simple reaction-diffusion equation. The results of the numerical analysis allow to select the sensor design conditions, including the morphology of the sensor layer, its thickness, operating temperature, and layer type. The numerical results basing on the code elaborated numerical system (written in Python language), were analysed. The theoretical results were verified and confirmed experimentally.

15

Podzespoły z akustyczną falą powierzchniową

Filipiak J., Steczko G., Kostrzewa S., Wcisło Ł

Przegląd Elektrotechniczny

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2015

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R. 91, nr 1

140-143

PL

W pracy przedstawiono podzespoły z akustyczną falą powierzchniową. Omówiono ich historyczny rozwój od wynalazku przetwornika międzypalczastego przez pierwsze zastosowania do obróbki sygnałów złożonych w systemach radiolokacyjnych i do wprowadzenia filtrów AFP dla telefonii komórkowej. Przedstawiono praktycznie wykonane podzespoły z AFP znane z literatury oraz z prac Autorów.

EN

The paper presents components of surface acoustic wave devices. Will discuss the historical development of the components of the AFP since invention the interdigital transducer the first use of complex signal processing in radar systems for the introduction of filters AFP for miniaturization of mobile telephony. The components are practically made of AFP familiar with the literature and the work of the Authors.

16

Performance Analysis of Vertical Handoff Metrics using Variance Based Algorithms

Bijwe A., Dethe C. G.

Journal of Applied Computer Science Methods

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2015

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Vol. 7 No. 1

33--42

EN

Vertical handover is the evolving concept in 4G for seamless communication between heterogeneous networks. In this paper, our main objective is to analyze handover between two WLAN, two Wimax, two UMTS networks. The vertical handover decision is taken based on the variance based algorithm, which calculates the variance of parameters such as delay, jitter, bandwidth and packet loss for various above mentioned networks and the network with most of the parameters with minimum variance is selected. This algorithm is also compared with other algorithms such as MEW (Multiplicative experiment weighting), SAW (Simple Additive Weighting), TOPOSIS (Technique for order preference by similarity to ideal solution) and GRA (Grey Relational Analysis). These algorithms are appropriate for different traffic classes. Simulation results for proposed variance based algorithm in Matlab is discussed and compared with other Multiple attribute decision making algorithm basis of bandwidth; jitter, delay etc. are discussed in the paper. It can be seen that the proposed variance algorithm gives less packet delay than all the algorithms, Jitter is also is least than all the other algorithms.

17

CrMoV steel welding in the narrow gap using of SAW technology

Holub L., Dunovský J., Suchánek J.

Journal of Achievements in Materials and Manufacturing Engineering

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2014

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Vol. 62, nr 1

31--37

EN

Purpose: of this paper is the verification of multi-layer SAW welding the raw material “1.6946” by different welding consumables (TOPCORE 838 B, Thermatit MTS 616) in the „ultra” narrow gap using the prescribed temperature cycle and subsequent heat treatment. Design/methodology/approach: An evaluation of the mechanical properties of the test for both types welding consumables. The measured values of yield strength and the tensile strength exhibit comparable properties to the RAW material “Inspection Certificate” for welding consumable “TOPCORE 838 B”. Findings: Thermatit MTS 616” was found falling below the specified values of impact energy, ductility. The welding consumable TOPCORE 838 B shows less susceptibility to the brittleness. Based on the results will be verified by the existence of internal structures arising using the microstructure analysis & ARA diagram of the base material 1.6496. Research limitations/implications: Obtained results will be subsequently verified the existence of internal generated microstructures using the ARA chart of the base material (W Nr. 1.6496) for the future design of the new temperature cycles in all phases of the production. Originality/value: The welding consumable “TOPCORE 838 B” showed the low tendency to embrittlement in the heat-affected zone using the defined heat treatment. On the basic of the examination the welding consumable “TOPCORE 838 B” can be recommended to be used for the welding process, thermal cycle and heat treatment.

18

Wyznaczenie wybranych parametrów piezoelektrycznych kryształu SrLaGa3O7

Sadura J., Brzozowski E., Wieteska K., Wierzchowski W.

Materiały Elektroniczne

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2013

|

T. 41, nr 2

3--8

PL

W pracy wyznaczono parametry piezoelektryczne monokryształu SrLaGa3O7 (SLGO) otrzymanego w ITME metodą Czochralskiego, należącego podobnie jak BaLaGa3O7 (BLGO) do grupy związków chemicznych opisanych ogólnym wzorem ABC3O7 (gdzie A = Ca, Sr, Ba; B = La, Gd; C = Ga, Al ). Pomiary i obliczenia przeprowadzono dla różnych orientacji kryształu, lepsze właściwości piezoelektryczne (najwyższy współczynnik sprzężenia elektromechanicznego K2) wykazały płytki o orientacji 45°XZ oraz ZX40°. Przeprowadzone badania termiczne potwierdziły możliwość wykorzystania tego piezoelektryka jako podłoża podzespołu wysokotemperaturowego. Zastosowana metoda badawczo – pomiarowa pozwala na szybkie szacowanie parametrów kryształu, jak również jego przydatności jako materiału piezoelektrycznego do zastosowań w podzespołach z AFP.

EN

This paper presents the piezoelectric properties of the SrLaGa3O7 (SLGO) crystal grown at ITME using the conventional RF-heating Czochralski method. SLGO, just like BaLaGa3O7 (BLGO), belongs to the group of compounds described by the general formula ABC3O7 (where A = Ca, Sr, Ba; B = La, Gd; C = Ga, Al). Measurements and calculation of SAW parameters were made for different crystal plane orientations. Better piezoelectric parameters were found in 45°XZ and ZX40° orientations of SLGO. The thermal study confirmed the possibility of using this crystal as a high-temperature component base. The applied research and measurement method allows a quick estimation of the parameters of the crystal, as well as evaluation of its usefulness as a piezoelectric material for application in SAW components.

19

Bezinwazyjne metody pomiaru momentu obrotowego

Sadowski A., Żółtowski B.

Logistyka

|

2012

|

nr 6

PL

W niniejszym artykule przedstawiono zależności charakteryzujące moment obrotowy wykorzystywany do napędu maszyn. Wyszczególniono celowość monitorowania jego poziomu w maszynach w aspekcie gospodarki energetycznej w celu obniżenia kosztów, a także zwiększenia efektywności napędu maszyn przy jednoczesnym zachowaniu norm bezpieczeństwa. Przedstawiono i scharakteryzowano metody pomiarowe wykorzystujące techniki bezkontaktowe oraz wyznaczono różnice dzielące je od tradycyjnego podejścia do pomiarów momentu obrotowego.

EN

In this paper depending on the torque used to drive machines. Detailed monitoring of its level of desirability of the machines in the aspect of energy management to reduce costs and drive efficiency while maintaining the machinery safety standards. Presents the measurement methods and characterized using non-contact technique and determination of the differences between them and the traditional approach for measuring torque.

20

SAW sensor for detection of hydrocarbons. Numerical analysis and experimental results

Hejczyk T., Urbańczyk M., Wituła R., Maciak E.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2012

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Vol. 60, nr 3

589-595

EN

The paper presents the results of numerical analyses of the SAW gas sensor in the steady and non-steady state. The effect of SAW velocity changes vs. the surface electrical conductivity of the sensing layer is predicted. The conductivity of the porous sensing layer above the piezoelectric waveguide depends on the profile of the diffused gas molecule concentration inside the layer. Knudsen's model of gas diffusion was used. Numerical results for the gases CH4, C2H4, C3H8, C6H6 in the steady state and CH4 in the non-steady state in the WO3 sensing layer have been shown. The results of numerical analyzes allow to select the sensor design conditions, including the morphology of the sensor layer, its thickness and operating temperature. Some numerical results were verified in experimental studies concerning methane.