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Tytuł:
Detection of Sub-Surface Defects in Semi-Finished Products from Aluminum Alloys by the Eddy Current Method
Autorzy:
Krysztofik, Józef
Malicki, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2105181.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
eddy current testing
tomographic testing
subsurface discontinuities
standard depth of penetration
effective depth of penetration
Opis:
The article presents the results of tests aimed at detecting discontinuities in the subsurface layer of elements intended for further processing. For the initial identification of discontinuities, the method of computed tomography was used. Based on the tomographic images of selected typical defects and measurements of the electrical conductivity of the material, the parameters for the eddy current tests were determined. A series of discontinuities in the subsurface layer to a depth of about 0.48 mm were detected. This allowed, at a given stage of machining, relevant elements to be selected for further processing.
Źródło:
Fatigue of Aircraft Structures; 2021, 13; 31--39
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Określanie głębokości elementów podziemnych metodą georadarową
Determination of depth of underground structures with the radar method
Autorzy:
Sołtys, M.
Powiązania:
https://bibliotekanauki.pl/articles/262443.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
georadar
głębokość
radargram
ground penetrating radar
depth of penetration
Opis:
W pracy podano zasadnicze elementy kształtujące zakres pomiaru głębokości georadarem z uwzględnieniem uwarunkowań obejmujących czynniki instrumentalne i wybrane parametry penetrowanego ośrodka. Wzajemne zależności pomiędzy czynnikami instrumentalnymi i parametrami pomiaru dotyczyły: częstotliwości anteny, rozmiaru i głębokości lokalizowanego obiektu, częstotliwości próbkowania, doboru okna czasowego, prędkości rozchodzenia się fal elektromagnetycznych w badanym ośrodku. Przedstawiono geometryczne zasady określania głębokości obiektów oraz dokonano oceny dokładności przetworzonych radargramów
The paper discusses essential factors influencing the range of depth determination with GPR, including instrument features and chosen parameters of penetrated medium. Interrelations between instrument factors and measurement parameters pertained to: antenna frequency, size and depth of the object to be located, sampling frequency, time window selection and velocity of electromagnetic waves in the penetrated ground. Geometric principles of depth determination are presented and accuracy of processed radargrams is assessed
Źródło:
Geodezja / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2005, 11, 1/1; 175-182
1234-6608
Pojawia się w:
Geodezja / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monte Carlo calculations of positron implantation profiles and backscattering probabilities in gold
Autorzy:
Aydin, A.
Powiązania:
https://bibliotekanauki.pl/articles/147555.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
backscattering
computer simulation
incoming angle
mean penetration depth
positron
Opis:
The transport of charged particles through matter is worth considering for various applications. In this work, backscattering probabilities and mean penetration depths were calculated from the implantation profiles for positrons of energies 1-75 keV entering normally at various angles into a semi-infinite gold target. The theoretical results of backscattering probability and mean penetration depth are compared with other published [1, 3, 4, 10, 11, 13]. Monte Carlo calculations and experimental results for the semi-infinite gold target. In general, good agreement is observed.
Źródło:
Nukleonika; 2001, 46, 3; 87-90
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence on heterogeneous earth layers parameters’ contrast on ground return impedance
Autorzy:
Lazimov, T.
Saafan, E.
Powiązania:
https://bibliotekanauki.pl/articles/410610.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Carson problem
ground return impedance
horizontally-layered earth
penetration depth
Opis:
Aerial electrical line’s impedances of ground return through heterogeneous and homogeneous grounds and their differences were calculated for the earth with different interlayer contrast of parameters for series thicknesses of the earth upper layer. Behavior of the impedance differences against changes of frequency and upper layer’s depth is investigated in the article. It was shown that the worst approach of relative differences to the zero takes place for the little thicknesses of the earth upper layer (less than 8 meters) and very high frequencies at which the impedance concept loses its certainty and physical meaning.
Źródło:
Present Problems of Power System Control; 2015, 6; 15-20
2084-2201
Pojawia się w:
Present Problems of Power System Control
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Comparative Study on Ballistic Behaviour of MWCNT / Graphene Reinforced AL6061 Surface Composites Fabricated Via Friction Stir Processing
Autorzy:
Magarajan, U.
Suresh Kumar, S.
Powiązania:
https://bibliotekanauki.pl/articles/27324483.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
ballistic behaviour
friction stir processing
graphene
Multi Walled Carbon Nano Tubes
depth of penetration
Opis:
In this work, a comparative study on the ballistic behaviour of friction stir processed AL6061 targets had been made. Base Metal AL6061 (BM) plates with 25 mm thickness were friction stir processed by adding Multi Walled Carbon Nano Tubes (MWCNT) and Graphene (G), producing AL6061-MWCNT and AL6061-G surface composites. Optical microscopy and microhardness test on BM, AL6061-MWCNT and AL6061-G samples were performed as per the standard procedure. It was noticed that uniform dispersion of ceramic particles and refined grains were obtained for the friction stir processed surface composites. From the microhardness test, it was perceived that friction stir processing had induced strengthening of surface composites, hence increasing the microhardness of AL6061-MWCNT and AL6061-G by ~60.3% and ~73.6% respectively. Also, ballistic experiments were conducted at 680±10 m/s by impacting Ø7.62×51 mm projectiles. AL6063 backing plates were placed to compare the ballistic behaviours AL6061-MWCNT and AL6061-G targets by depth of penetration. It was noted that the depth of penetration of AL6061-MWCNT and AL6061-G targets were 37.81% and 65.84% lesser than the BM target. Further, from the results of Post ballistic microscopy it was observed that the microstructure near and away from the penetration channel edge looks unchanged in BM target. However, the AL6061-MWCNT and AL6061-G targets showed considerable change in their morphology, by forming Adiabatic Shear Bands.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 541--550
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Response surface methodology assisted multi-objectiveoptimization of TIG process for 15CDV6 steel
Autorzy:
Skariya, P. D.
Satheesh, D. M.
Dhas, J. E.
Chandrasekar, G.
Powiązania:
https://bibliotekanauki.pl/articles/1839113.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
TIG welding
15CDV6 HSLA steel
depth of penetration
bead width
HAZ width
Opis:
Welding is a way of heating pieces of metal usingelectricity or flame so that they melt and stick together. There aremany kinds of welding processes, such as, for instance, MIG/MAGand MMA welding. However, such welding schemes require moreelectrodes during the process of welding. Hence, this paper intendsto analyse the alternative tungsten inert gas (TIG) welding tech-nology using Response Surface Methodology (RSM), and to identifythe effect of TIG welding process parameters on the weld bead pro-file of 15CDV6 high strength low alloy (HSLA) steel. Moreover, themethodology applied allows for identification of the optimal weld-ing conditions by means of multi-objective optimization using RSMto increase the depth of penetration (DOP) and reduce BW (beadwidth) and heat-affected zone (HAZ) width. The variables takenfor the model-based investigations are: welding current (Wc), torchspeed (Ts), gas flow rate (Gr), torch angle (Ta) and arc gap (Ag).Moreover, the responses taken are DOP, BW and HAZ width. Fur-ther, the results from the proposed model optimisation can be seenas highly beneficial for the rocket-motor hardware program, indus-tries and fabrication of pressure vessels, which are using 15CDV6steel.
Źródło:
Control and Cybernetics; 2018, 47, 4; 465-496
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of SiO2 flux on the depth of penetration, microstructure, texture and mechanical behavior of AA6063 T6 aluminum alloy using activated TIG welding
Autorzy:
Kumar, Rajiv
Vettivel, S. C.
Kumar Kansal, Harmesh
Powiązania:
https://bibliotekanauki.pl/articles/2173585.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloy
depth of penetration
tensile strength texture
stop aluminium
głębokość penetracji
wytrzymałość na rozciąganie
Opis:
Activated tungsten inert gas (ATIG) welding has a good depth of penetration (DOP) as compared to the conventional tungsten inert gas (TIG) welding. This paper is mainly focused on ATIG characterization and mechanical behavior of aluminum alloy (AA) 6063-T6 using SiO2 flux. The characterization of the base material (BM), fusion zone (FZ), heat affected zone (HAZ) and, partially melted zone is carried out using the suitable characterization methods. The weld quality is characterized using ultrasonic-assisted non-destructive evaluation. A-scan result confirms that the ATIG welded samples have more DOP and less bead width as compared to conventional TIG. The recorded tensile strength of ATIG with SiO2 is better than the conventional TIG welding. The failure mode is ductile for ATIG welding with larger fracture edges and is brittle in the case of conventional TIG welding.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136215
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dispersion Curves of Love Waves in Elastic Waveguides Loaded with a Newtonian Liquid Layer of Finite Thickness
Autorzy:
Kiełczyński, Piotr
Szalewski, Marek
Balcerzak, Andrzej
Wieja, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/177115.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
Love waves
ultrasonic sensors
Newtonian liquid
penetration depth
biosensors
chemosensors
viscosity sensors
Opis:
In this paper, the authors analyse the propagation of surface Love waves in an elastic layered waveguide (elastic guiding layer deposited on an elastic substrate) covered on its surface with a Newtonian liquid layer of finite thickness. By solving the equations of motion in the constituent regions (elastic substrate, elastic surface layer and Newtonian liquid) and imposing the appropriate boundary conditions, the authors established an analytical form of the complex dispersion equation for Love surface waves. Further, decomposition of the complex dispersion equation into its real and imaginary part, enabled for evaluation of the phase velocity and attenuation dispersion curves of the Love wave. Subsequently, the influence of the finite thickness of a Newtonian liquid on the dispersion curves was evaluated. Theoretical (numerical) analysis shows that when the thickness of the Newtonian liquid layer exceeds approximately four penetration depths 4δ of the wave in a Newtonian liquid, then this Newtonian liquid layer can be regarded as a semi-infinite half-space. The results obtained in this paper can be important in the design and optimization of ultrasonic Love wave sensors such as: biosensors, chemosensors and viscosity sensors. Love wave viscosity sensors can be used to assess the viscosity of various liquids, e.g. liquid polymers.
Źródło:
Archives of Acoustics; 2020, 45, 1; 19-27
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Visualization of magnetotelluric data with apparent velocity method
Wizualizacja danych magnetotellurycznych przy zastosowaniu metody prędkości pozornej
Autorzy:
Miecznik, J.
Klityński, W.
Powiązania:
https://bibliotekanauki.pl/articles/183761.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
sondowanie magnetotelluryczne
wizualizacja
prędkość pozorna
głębokość penetracji
magnetotelluric sounding
visualization
apparent velocity
depth of penetration
Opis:
Magnetotelluric (MT) field data are usually presented as plots of amplitude and phase MT sounding data vs frequency. Visualization of resistivity changes of geoelectric complexes with the use of apparent resistivity and phase curves give qualitative results only. Quantitative interpretation of MT sounding curves is needed to get geoelectric parameters. For a 1D horizontally layered earth, amplitude curves (apparent resistivity curves) and phase curves can be transformed into apparent velocity curves versus depth of EM field penetration into the conducting earth. Apparent velocity curves can be approximated by straight-line segments corresponding to homogeneous geoelectric layer complexes. Each segment of the apparent velocity curve (with a given angle of inclination) is related with the resistivity and thickness of individual geoelectric complexes. For heterogeneous earth (2D or 3D) vertical component of the magnetic field is directly connected with boundary of geo-electric complexes. It can be used to express components of vectors of apparent velocity. For a 1D horizontally layered earth, a vector of apparent velocity has only the vertical component. For heterogeneous earth horizontal components of apparent velocity also are inducted. The angle of inclination of the total vector of velocity and its value depend on the geometry of studied structure.
Podstawową wielkością prezentującą zmiany przewodnictwa elektrycznego górotworu z głębokością jest oporność pozorna jako funkcja częstotliwości pola magnetotellurycznego. Wizualizacja tych zmian, jak również granic struktur geologicznych, przez oporność pozorną ma charakter jedynie jakościowy, dalece przybliżony. Parametry przekroju geoelektrycznego uzyskujemy jedynie przez interpretację ilościową danych pomiarowych. W przypadku przekrojów geoelektrycznych 1D krzywe sondowań magnetotellurycznych możemy przetransformować w krzywe prędkości pozornej jako funkcje głębokości wnikania pola elektromagnetycznego w głąb badanego ośrodka. Krzywe te możemy aproksymować odcinkami linii prostych, a kąty nachylenia poszczególnych odcinków względem osi głębokości i ich punkty przecięcia są ściśle związane z opornościami i miąższościami poszczególnych warstw geoelektrycznych. W przypadku ośrodków niejednorodnych 2D i 3D wielkością bezpośrednio związaną z granicami kompleksów geoelektrycznych jest pionowa składowa pola magnetycznego. Przez tę wielkość możemy wyrazić składowe wektora prędkości pozornej. W obszarach 1D wektor prędkości redukuje się do składowej pionowej, natomiast w obszarach niejednorodnych generują się również składowe poziome. Kąt nachylenia całkowitego wektora prędkości do poziomu i jego długość są ściśle związane z geometrią badanej struktury.
Źródło:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie; 2010, 36, 2; 187-202
0138-0974
Pojawia się w:
Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of SiO2 flux on the depth of penetration, microstructure, texture and mechanical behavior of AA6063 T6 aluminum alloy using activated TIG welding
Autorzy:
Kumar, Rajiv
Vettivel, S. C.
Kumar Kansal, Harmesh
Powiązania:
https://bibliotekanauki.pl/articles/2090702.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloy
depth of penetration
tensile strength texture
stop aluminium
głębokość penetracji
wytrzymałość na rozciąganie
Opis:
Activated tungsten inert gas (ATIG) welding has a good depth of penetration (DOP) as compared to the conventional tungsten inert gas (TIG) welding. This paper is mainly focused on ATIG characterization and mechanical behavior of aluminum alloy (AA) 6063-T6 using SiO2 flux. The characterization of the base material (BM), fusion zone (FZ), heat affected zone (HAZ) and, partially melted zone is carried out using the suitable characterization methods. The weld quality is characterized using ultrasonic-assisted non-destructive evaluation. A-scan result confirms that the ATIG welded samples have more DOP and less bead width as compared to conventional TIG. The recorded tensile strength of ATIG with SiO2 is better than the conventional TIG welding. The failure mode is ductile for ATIG welding with larger fracture edges and is brittle in the case of conventional TIG welding.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136215, 1--8
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-domain electromagnetic method in geological research
Autorzy:
Klityński, W.
Stefaniuk, M.
Miecznik, J.
Powiązania:
https://bibliotekanauki.pl/articles/191814.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Time-domain electromagnetic method
near zone
apparent resistivity
penetration depth
hydrocarbon prospecting
Opis:
This paper describes the theoretical basis of the time-domain electromagnetic method (TDEM) and its application in geological research. The paper discusses the behavior of the electromagnetic field of pulse current sources (magnetic dipole) in the near zone. The problem of the penetration depth of the TDEM method is discussed, in the context of its application in geological research and to gas exploration in the Rudka Gas Field, located in the Carpathian Foredeep. The TDEM sounding curves from the Rudka Field and the influence of noise on the penetration depth are discussed. A 1-D Occam inversion of TDEM soundings was obtained for a profile across the borehole A-10. An integrated (TDEM and borehole) interpretation of the data was made and a 2-D resistivity cross-section was obtained along the profile, as a contribution to geological reconnaissance for gas prospecting.
Źródło:
Annales Societatis Geologorum Poloniae; 2014, 84, 1; 71-79
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A novel deep penetrating eddy current probe based on phase shifted fields and its application to inspection of defects
Autorzy:
Wu, Meixian
Zhang, Dongli
Wang, Chuanglong
Powiązania:
https://bibliotekanauki.pl/articles/221582.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
skin effect
penetration depth
austenitic stainless steel
eddy current probe
phase shifted fields
Opis:
Due to the skin effect of eddy currents, the depth of cracks which can be detected by the traditional eddy current probe is very limited. In order to improve the ability of eddy current probes to inspect deep cracks in metal thick-walled structures, a new eddy current probe using an excitation system with phase shifted fields was proposed. Its feasibility for detecting deep cracks was verified by simulation and experiments. The results showed that the penetration depth of eddy currents in austenitic stainless steel is effectively enhanced by using the new probe.
Źródło:
Metrology and Measurement Systems; 2020, 27, 2; 275-287
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of the depth of penetration in a plunging hollow jet using artificial intelligence techniques
Autorzy:
Bodana, D.
Tiwari, N. M.
Ranjan, S.
Ghanekar, U.
Powiązania:
https://bibliotekanauki.pl/articles/1818515.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
depth of penetration
machine learning model
classical models
plunging hollow jets
głębokość penetracji
model uczenia maszynowego
modele klasyczne
Opis:
Purpose: Experimental investigations assessment and comparison of different classical models and machine learning models employed with Gaussian process regression (GPR) and artificial neural network (ANN) in the estimation of the depth of penetration (Hp) of plunging hollow jets. Design/methodology/approach: In this analysis, a set of data of 72 observations is derived from laboratory tests of plunging hollow jets which impinges into the water pool of tank. The jets parameters like jet length, discharge per unit water depth and volumetric oxygen transfer coefficient (Kla20) are varied corresponding to the depth of penetration (Hp) are estimated. The digital image processing techniques is used to estimate the depth of penetration. The Multiple nonlinear regression is used to establish an empirical relation representing the depth of penetration in terms of jet parameters of the plunging hollow jets which is further compared with the classical equations used in the previous research. The efficiency of MNLR and classical models is compared with the machine learning models (ANN and GPR). Models generated from the training data set (48 observations) are validated on the testing data set (24 observations) for the efficiency comparison. Sensitivity assessment is carried out to evaluate the impact of jet variables on the depth of penetration of the plunging hollow jet. Findings: The experimental performance of machine learning models is far better than classical models however, MNLR for predicting the depth of penetration of the hollow jets. Jet length is the most influential jet variable which affects the Hp. Research limitations/implications: The outcomes of the models efficiency are based on actual laboratory conditions and the evaluation capability of the regression models may vary beyond the availability of the existing data range. Practical implications: The depth of penetration of plunging hollow jets can be used in the industries as well as in environmental situations like pouring and filling containers with liquids (e.g. molten glass, molten plastics, molten metals, paints etc.), chemical and floatation process, wastewater treatment processes and gas absorption in gas liquid reactors. Originality/value: The comprehensive analyses of the depth of penetration through the plunging hollow jet using machine learning and classical models is carried out in this study. In past research, researchers were used the predictive modelling techniques to simulate the depth of penetration for the plunging solid jets only whereas this research simulate the depth of penetration for the plunging hollow jets with different jet variables.
Źródło:
Archives of Materials Science and Engineering; 2020, 103, 2; 49--61
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of fibre laser welding parameters on the microstructure and weld geometry of commercially pure titanium
Autorzy:
Abdulridha, M.M.
Jilabi, A.S.J.A.Z.
Powiązania:
https://bibliotekanauki.pl/articles/24200584.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
fibre laser welding
laser power
welding speed
CP titanium
depth penetration weld
weld width
spawanie laserem światłowodowym
moc lasera
prędkość spawania
CP tytan
głębokość wtopienia spoiny
szerokość spoiny
Opis:
Purpose: The primary purpose of the study was the metallurgical characterization of laser welds. The weldability of commercial production of pure titanium and titanium alloy (CP-Ti) has also been examined. Design/methodology/approach: In this research, the laser fibre method was used to weld sheets of pure titanium, and then microscopy and scanning electron microscopy were used to study the changes in the microstructure, the depth of weld penetration and the width of the weld area with changing welding parameters. Findings: The results proved that increasing the laser power significantly increases the depth of weld penetration and weld width. When the heat input is increased, the shape of the weld pool changes from a V shape to an hourglass shape. It was also observed that the depth of the crater formed increases with the increase in the laser power due to the increase in the melting and evaporation of the weld metal. Increasing the welding speed also has a negative impact on the weld geometry because it reduces the heat input and absorption of laser energy by the weld metal and thus reduces the melting of the metal. The microstructure of the fusion zone consists of acicular α. Fine grains formed in the weld centre at low heat input; the granules became columnar-like. Since commercially pure titanium contains a small amount of beta-phase stabilizers, the cooling rate is extremely high for martensite to occur. Research limitations/implications: In the future, it is recommended to study the effect of changing welding parameters on the mechanical properties of pure titanium because of its great importance in industrial and medical applications. Originality/value: Studying the effect of changing laser power and welding speed on the metallurgical properties of pure titanium, and consequently its effect on the mechanical properties of welds.
Źródło:
Archives of Materials Science and Engineering; 2022, 117, 1; 34--41
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza przewodności ciała człowieka w aspekcie wnikania fal elektromagnetycznych w.cz.
Man body conductivity analysis in spite of view HF electromagnetic radiation absorption
Autorzy:
Przytulski, A.
Powiązania:
https://bibliotekanauki.pl/articles/154787.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
fala elektromagnetyczna płaska
ciało człowieka
wnikanie
głębokość wnikania
przewodzenie
human body
flat electromagnetic wave
wave penetration
penetration depth
conductivity
Opis:
W artykule obliczone zostały zmiany długości i prędkości rozchodzenia się fali elektromagnetycznej w.cz. z wybranego przedziału częstotliwości po przejściu z powietrza do ciała człowieka. Obliczono również umowną głębokość wnikania fali. Autorzy zajmujący się tą problematyką przyjmują, że ciało jest środowiskiem dobrze przewodzącym. W niniejszym opracowaniu dokonano również obliczeń przy założeniu, że ciało dla pewnych częstotliwości przedstawia sobą środowisko słabo przewodzące. Dla takiego założenia ważny parametr jakim jest głębokość wnikania fali wykazuje znacznie większą wartość niż przy przyjęciu, że jest ono dobrym przewodnikiem.
In a very large number of publications dealing with the influence of the HF electromagnetic field upon the human body, the conventional depth of wave penetration into the body (Fig. 2)is calculated. However, any changes in the parameters of the wave (its length and the speed of its propagation) in a new environment are not taken into account. While calculating the conventional depth of penetration, the authors assume that the human body is a well conducting medium. In the presented paper the author has computed the depth the wave penetration into the body making use of the dependences obligatory both for a feebly and well conducting media. The criterion, similar to that used in technology, i.e., the relation of the conduction currents to the dielectric displacement ones, has been deployed. It is established that for the frequencies above 0,5 GHz the human body ought to be treated as a feebly conducting medium. The changes in the parameters of the body and the above–mentioned coefficient are included in the item [8] in the literature. Subsequently, the charges in the wavelengths and the speeds of wave propagation in the body have been calculated assuming that it is both a feebly and well conducting medium (Figs. 5, 6, 7 and 8). By accepting the body as a good conductor it is possible to observe a much smaller depth of wave penetration than in the case of assuming that it is a poor conductor. The considerable differences are also noticed while the wavelengths and speed of wave penetration are being calculated. While computing it is necessary to determine strictly in what kind of environment the wave is going to propagate depending on the frequency and parameters of the body.
Źródło:
Pomiary Automatyka Kontrola; 2013, R. 59, nr 10, 10; 1124-1127
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 25

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