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Tytuł:
Cylindrichnus concentricus Toots in Howard, 1966 (trace fossil) in its type locality, Upper Cretaceous, Wyoming
Autorzy:
Ekdale, A. A.
Harding, S. C.
Powiązania:
https://bibliotekanauki.pl/articles/191694.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
bioturbation
Cretaceous
Cylindrichnus concentricus
type locality
Wyoming
Opis:
Cylindrichnus concentricus is a wide spread trace fossil in shallow marine sedimentary rocks of Mesozoic and Cenozoic age. This paper clarifies the ichnotaxonomy of C. concentricus by of fering an emended diagnosis of the ichnogenus and a new diagnosis of the ichnospecies. The broad, bow-shaped architecture of C. concentricus with two openings at the sediment surface suggests that the trace maker was either a filter-feeding animal that captured suspended food particles from the water column or else a surface deposit feeder that employed tentacles or an eversible pharynx to collect nutritious sediment from the surface around one or both of the burrow openings. Although C. concentricus has been reported in a variety of different sedimentary environments around the world, in its type locality in the Cretaceous of Wyoming the trace fossilis found in low-diversity or monoichnospecific beds that exhibit hummocky cross stratification. This occurrence suggests the burrower’s tolerance (or perhaps preference) for an episodic high-energy hydrodynamic environmentre lated to major storms.
Źródło:
Annales Societatis Geologorum Poloniae; 2015, 85, 3; 427-432
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Model rozwoju mączniaka rzekomego (Pseudoperonospora humuli) - aplikacja internetowa
Downy mildew development model (Pseudoperonospora humuli) - internet application
Autorzy:
Zaliwski, A. S.
Pietruch, C.
Powiązania:
https://bibliotekanauki.pl/articles/288148.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
mączniak rzekomy
chmiel
model ochrona
dane pogodowe
system wspomagania decyzji
internetowa aplikacja bazodanowa
downy mildew
plant protection model
weather data
decision support system
Internet database application
Opis:
Przedstawiono internetową aplikację służącą do oceny zagrożenia plantacji chmielu mączniakiem rzekomym. Do budowy aplikacji wykorzystano model rozwoju mączniaka rzekomego, opracowany w Instytucie Chmielarskim w Hüll (Bawaria - Niemcy) i walidowany w Polsce w 1988 roku. Zagrożenie ocenia się na podstawie analizy warunków sprzyjających rozwojowi choroby, określonych przez wartości tzw. pięciodobowego indeksu zagrożenia. Do obliczenia indeksu służą dobowe dane pogodowe (temperatura i wilgotność względna powietrza oraz suma opadu atmosferycznego). Aplikacja oblicza indeks zagrożenia na podstawie danych pogodowych z ostatnich jedenastu dni pobranych z 27 stacji agrometeorologicznych IUNG-PIB. Użytkownik wybiera stację z mapy lub z listy wyboru i wartości indeksu zagrożenia są przedstawiane na wykresie. W przypadku wystąpienia w kolejnych jedenastu dniach indeksu zagrożenia o wartości krytycznej równej lub większej niż 500 pkt, model zaleca wykonanie zabiegu ochrony roślin. Dla wybranych stacji generowane są także pliki tekstowe z danymi pogodowymi, które użytkownik może wykorzystać do kompleksowej analizy warunków sprzyjających rozwojowi mączniaka rzekomego w systemie wspomagania decyzji ProgChmiel.
An Internet application for the estimation of the risk from downy mildew in hop gardens is presented. The downy mildew development model, elaborated at the Hop Institute in Hüll (Bavaria in Germany) and validated in Poland in 1988 was used in the application. The risk is estimated on the basis of an analysis of the conditions favourable for the disease development, determined by the socalled five-day risk index. To calculate the index daily weather data are used (temperature, relative air humidity and precipitation sum). The application calculates the risk index for the latest eleven days from the data from 27 IUNG-PIB's agro-meteorological stations. The users are presented with a graph of the risk index values, after having selected a station from the map or from the drop-down list. In the case of the index being equal to or greater than the critical value of 500 pt in the last eleven consecutive days, the model recommends performing a protection treatment. For the selected stations the text files with weather data in the ProgChmiel DSS format are available. These can be utilised for a more comprehensive analysis of the conditions conducive to the development of downy mildew.
Źródło:
Inżynieria Rolnicza; 2012, R. 16, nr 4, t. 1, 4, t. 1; 457-464
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Failure analysis of laminated composite plate under hygro-thermo mechanical load and optimisation
Autorzy:
Choudhury, A.
Mondal, S. C.
Sarkar, S.
Powiązania:
https://bibliotekanauki.pl/articles/264515.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
współczynnik wytrzymałości
kompozyt hybrydowy
obciążenia
first ply failure load
last ply failure load
strength ratio
fiber orientation angle
hybrid composite
Opis:
Failure analysis of laminated composite plates for different mechanical, thermo mechanical and hygro-thermo mechanical loads for different ply thicknesses, stacking sequences, fiber orientation angles and composite material systems is presented in the paper. A comparative study of different failure theories is also presented in the paper. The effect of fiber orientation angles on the first ply failure load is also studied. A hybrid composite laminate is developed based on the first ply failure load which minimizes weight and cost. The last ply failure load based on fully discounted method is calculated for different stacking sequences. An optimum composite material system and laminate layup is studied for a targeted strength ratio which minimizes weight.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 509-526
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predictors of sick leave owing to neck or low back pain: a 12-year longitudinal cohort study in a rural male population
Autorzy:
Holmberg, S A C
Thelin, A.G.
Powiązania:
https://bibliotekanauki.pl/articles/50130.pdf
Data publikacji:
2010
Wydawca:
Instytut Medycyny Wsi
Tematy:
low back pain
neck pain
farming
sick leave
life style
self-employment
male
rural population
public health
risk
diagnosis
risk factor
Źródło:
Annals of Agricultural and Environmental Medicine; 2010, 17, 2; 251-257
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of isochromatics and isoclinics phasemaps for the photoelastic technique with use phase shifting and a large number of high precision images
Autorzy:
Magalhaes, C. A.
Neto, P. S.
Magalhaes Jr P. A., A.
de Barcellos, C. S.
Powiązania:
https://bibliotekanauki.pl/articles/220820.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
photoelasticity
metrology
stress analysis
strain measurement
optical measurement systems
optical interferometry
experimental techniques
Opis:
Digital photoelasticity is an important optical metrology follow-up for stress and strain analysis using full-field digital photographic images. Advances in digital image processing, data acquisition, procedures for pattern recognition and storage capacity enable the use of the computer-aided technique in automation and facilitate improvement of the digital photoelastic technique. The objective of this research is to find new equations for a novel phase-shifting method in digital photoelasticity. Some innovations are proposed. In terms of phaseshifting, only the analyzer is rotated, and the other equations are deduced by applying a new numerical technique instead of the usual algebraic techniques. This approach can be used to calculate a larger sequence of images. Each image represents a pattern and a measurement of the stresses present in the object. A decrease in the mean errors was obtained by increasing the number of observations. A reduction in the difference between the theoretical and experimental values of stresses was obtained by increasing the number of images in the equations for calculating phase. Every photographic image has errors and random noise, but the uncertainties due to these effects can be reduced with a larger number of observations. The proposed method with many images and high accuracy is a good alternative to the photoelastic techniques.
Źródło:
Metrology and Measurement Systems; 2013, 20, 1; 127-138
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Moisture Absorption and Desorption in Flax and Hemp Fibres and Yarns
Absorpcja i desorpcja wilgoci w przędzach lnianych i konopnych
Autorzy:
Mustata, A.
Mustata, F. S. C.
Powiązania:
https://bibliotekanauki.pl/articles/232968.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
fibre
yarn
electrical resistance
mechanical properties
hygroscopicity
włókna
przędza
opór elektryczny
właściwości mechaniczne
higroskopijność
Opis:
The aim of this paper is to present research work about the mode in which the water sorption- desorption process is influenced by the type of spinning yarns (dry or wet) and by the type of roving treatment (boiling or bleaching) in the case of flax and hemp yarns. The hygroscopic properties of fibres, yarns and woven fabrics from flax and hemp boiled or bleached were investigated at different relative humidities. The saturation limit of moisture absorption of the fibres varies depending on the source as well as pre-treatment of the sample. The effect of water quantity absorbed on the electrical resistance of the fibres and yarns and on the mechanical properties was examined.
Przedstawiono badania dotyczące sorpcji i desorpcji wilgoci włókien, przędz i tkanin gotowanych i bielonych prowadzone w warunkach różnej wilgotności względnej. Badano również wpływ absorpcji wody na oporność elektryczną włókien i przędz oraz wpływ na ich właściwości mechaniczne.
Źródło:
Fibres & Textiles in Eastern Europe; 2013, 3 (99); 26-30
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Telecommunications, Universal Service and Poverty in Mexico: a Public Policy Assessment (1990-2008)
Autorzy:
Casanueva-Reguart, C.
Pita, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/309124.pdf
Data publikacji:
2010
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
development
digital divide
market power
regulatory capture
social inclusion
universal service
Opis:
This article analyzes the design and implementation of telecommunications service policies targeted at the poorest regions of Mexico (1990-2008). It begins by defining universal access and service policies, their economic and social rationale. Secondly, it discusses the scope of public policies on universal service provision designed by Mexican authorities to achieve the goal of universal access. Thirdly, the paper analyzes the distributive effects of this set of policies among the poorest sectors of the population. The sources on which this research was based were two national surveys: the Household Income and Expenditure Survey (2008), and the Household Survey of the Access and Use of Information Technologies (2007). The additional information on regional economic development was based on the poverty indexes by the national population council and economic information given by Mexico's Census Bureau. Additional use was made of the annual reports prepared by Ministry of Communications, statistics published by the Federal Telecommunications Commission and official documents prepared by the government agencies. Finally, a series of in-depth interviews was conducted with the former representatives of the Office of Rural Telephony. Finally, the article discusses, in the light of available evidence, possible explanations for the apparent failure of the universal service policy that was implemented to bring at least basic voice services to Mexico's neediest.
Źródło:
Journal of Telecommunications and Information Technology; 2010, 2; 15-27
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reduction in organic matter fractions and structural stability following cultivation of tropical forests in Ethiopia and Nigeria
Autorzy:
Mbagwu, J.S.C.
Piccolo, A.
Powiązania:
https://bibliotekanauki.pl/articles/25479.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
organic matter
Ethiopia
tropical soil
soil
tropical forest
aggregate stability
Nigeria
Źródło:
International Agrophysics; 2004, 18, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Palaeozoic foliage from China displays affinities to Cycadales rather than to Bennettitales necessitating a re-evaluation of the Palaeozoic Pterophyllum species
Autorzy:
Pott, C.
McLoughlin, S.
Lindstrom, A.
Powiązania:
https://bibliotekanauki.pl/articles/23351.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Late Paleozoic
Paleozoic
China
Cycadales
Bennettitales
Pseudoctenis
Pterophyllum
cuticle analysis
epidermal anatomy
Carboniferous
Permian
paleontology
Opis:
The epidermal anatomy of Pseudoctenis samchokense is described revealing non−bennettitalean characters of these leaves from the Permo−Carboniferous of China (and Korea). The specimens were originally described as Pterophyllum samchokense suggesting a bennettitalean affinity. They can no longer be considered bennettitalean since their cuticles lack the distinctive brachyparacytic stomata of that clade. Pterophyllum was originally erected as a morphogenus for segmented leaves from the Mesozoic and has subsequently been clearly assigned to the Bennettitales. The segmented leaves from the Permo−Carboniferous of Shanxi and Hebei, China described herein require a new ordinal and generic assignment since the non−bennettitalean cuticular characters documented reinforce the uncertainties in attribution of any foliage older than Late Triassic to the Bennettitales. Based on leaf−architecture and epidermal anatomical characters, the specimens are at best assigned to the cycadalean genus Pseudoctenis. This genus was formerly known only from Mesozoic rocks. Consequently, the specimens are highly significant, as they are among the oldest known vegetative remains of cycads. Re−evaluation of the affinities of all specimens assigned to Pterophyllum from Palaeozoic rocks is thus essential. Based on a review of other Permian–Carboniferous fossil leaves assigned to Pterophyllum, we conclude that none yet reveals definitive bennettitalean characters.
Źródło:
Acta Palaeontologica Polonica; 2010, 55, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Two Advanced Vision Methods Based on Structural and Surface Analyses to Detect Defects in the Erichsen Cupping Test
Autorzy:
Jasiński, C.
Świłło, S.
Kocańda, A.
Powiązania:
https://bibliotekanauki.pl/articles/353647.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
defect detection
Erichsen cupping test
laser speckle
vision system
Opis:
Due to the wide range of various sheet metal grades and the need to verify the material properties, there are numerous methods to determine the material formability. One of them, that allows quick determination of sheet metal formability, is the Erichsen cupping test described in the ISO 20482: 2003 standard. In the presented work, the results of formability assessment for DC04 deepdrawing sheet metal were obtained by means of the traditionally carried out Erichsen cupping test and compared with the resultsobtained by using two advanced methods based on vision analysis. Application of these methods allows extending the traditional scope of analysis during Erichsen cupping test by determination of the necking and strain localization before fracture. The proposed methods were compared in order to dedicate appropriate solution for the industrial application and laboratory tests respectively, where the simplicity and reliability are the mean aspects need to be considered when applied to the Erichsen cupping test.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 1041-1049
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of palladium chemical structure on hydrogen sensing properties of carbonaceous–palladium thin films
Autorzy:
Kaminska, A.
Krawczyk, S.
Kozlowski, C.
Powiązania:
https://bibliotekanauki.pl/articles/173783.pdf
Data publikacji:
2013
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
C–Pd thin films
hydrogen sensor
FTIR spectroscopy
Opis:
In this work we investigate nanocomposite carbonaceous–palladium (C–Pd) films prepared by physical vapor deposition. Such films are promising materials for hydrogen sensor applications. This is related to the highly selective hydrogen absorption by palladium nanocrystallites. The C–Pd films obtained in various technological conditions differ in structure and electrical properties. These films were characterized by SEM, EDS and FTIR spectroscopy. FTIR spec-troscopy was used to determine the amount of palladium acetate and fullerene, incompletely decomposed during the deposition process. FTIR spectra enabled us to explain the differences in C–Pd films resistance based on palladium chemical structure. The possibility of the application of C–Pd films as active layers in hydrogen sensors was also studied. The results showed that synthesized C–Pd films containing palladium nanograins could be used for hydrogen sensing.
Źródło:
Optica Applicata; 2013, 43, 4; 633-640
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phylogenetic inference of Ericales based on plastid genomes and implication of cp-SSRs
Autorzy:
Hazra, A.
Das, S.
Bhattacharya, S.
Sur, S
Sengupta, C.
Powiązania:
https://bibliotekanauki.pl/articles/2096423.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
chloroplast genome
Ericales
phylogeny
simple sequence repeats
species tree
Opis:
Ericales is an ancient eudicot order encompassing numerous species of economic and ornamental values. Despite several phylogenomic studies, the evolutionary relationship among certain families of this group remains uncertain. The present study assessed a multilocus species tree of Ericales based on 107 chloroplast genomes. The plastome derived microsatellite motifs were also simultaneously explored to check their dynamicity in corroboration of species phylogeny and systematics. In addition to resolving the usual hierarchy, the present phylogenetic analysis enabled to resolve the persisting lineage disparity with valid statistical support. Accordingly, divergence incongruences of Primulaceae, Ebenaceae, and Sapotaceae from earlier reports were reinstated in presently inferred phylogeny, which further supported the latest transcriptome-based relationship of the corresponding group. Various SSR motif characteristics emerged following the recognition of the evolutionary pathway. Numerical variation in tetranucleotide repeats showed even intraspecific or varietal differences in Camellia sinensis. Validation of plastome microsatellite-based polymorphism among the related taxa might pave the way for future phylogenetic and population studies of this economically important group.
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2021, 102, 3; 277-283
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phytochemistry and antimicrobial property of fruits of Chrysophyllum albidum against selected clinical isolates
Autorzy:
Adeleye, S.A.
Orji, C.C.
Braide, W.
Akaluka, C.K.
Powiązania:
https://bibliotekanauki.pl/articles/10821.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:
The antimicrobial activity of methanolic and aqueous extracts of Chrysophyllum albidum fruits was investigated against clinical isolates(Staphylococcus aureus, Escherichia coli, Klebsiella pneumonia and Candida albicans). Qualitative phytochemistry of the plant indicated that the plant contained Flavonoids, Steroids, Alkaloids, Tannin, Anthraquinone and Cardiac glycosides while Saponins were reported absent. The maximum activity of the aqueous extracts in the test isolates was observed on Staphylococcus aureus, which showed clear zones with diameters of 24.0mm, 20.0mm and 16.5mm at concentrations of 100mg/ml, 50mg/ml and 25mg/ml respectively while it had low activity on Klebsiella pneumonia, with clear zones of inhibition of 15.0mm, 12.0mm and 10.5mm at same concentrations. On the other hand, Methanolic extracts activity on Staphylococcus aureus produced clear zones of 21.0mm, 17.5mm and 12.0mm at concentrations of 200mg/ml, 100mg/ml and 50mg/ml respectively as its best activity while the it had least observed activity on Klebsiella pneumonia with clear zones of 14.0mm, 11.5mm and 10.5mm at same concentrations. The aqueous extracts had greater activity than the methanolic extracts at same concentrations. Therefore, the fruit of the plant can be a good source of remedy in phytomedicine.
Źródło:
International Letters of Natural Sciences; 2016, 55
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectral Analysis and Euler Deconvolution of Regional Aeromagnetic Data to Delineate Sedimentary Thickness in Mmaku Area, South Eastern Nigeria
Autorzy:
Umeanoh, Daniel C.
Ofoha, Chimezie C.
Ugwu, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/1163284.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Euler Deconvolution
Mmaku area
Sedimentary Thickness
aeromagnetic data
Opis:
Quantitative analysis/interpretation was undetaken on an aeromagnetic data covering latitude 6°00’-6°30’N and longitude 7°00’-7°30’E of Mmaku area, South Eastern, Nigeria by means of spectral depth analysis and Euler Deconvolution. To determine the sedimentary thickness or the depth to basement peculiar within the area, regional-residual separation was applied on the total aeromagnetic data. The resulting residual was divided into overlapping sixteen (16) spectral grids using Ms Excel. This was saved in Comma Separated Variable (CSV) format and thus imported into Origin Pro software where Fast Fourier Transform (FFT) or spectral analysis was performed on the windowed or gridded residual. The residual data was also imported into Oasis Montaj software for Standard 3D Euler Deconvolution. The result of the spectral analysis shows that the depth to various causative sources vary from 3.472 km to 6.972 km for the deeper sources, with average thickness of 5.010 km and 1.177 km to 1.834 km for the shallower sources, with average value of 1.047 km. From the Euler depth solutions, depth values ranging from 1525.74 km to 2919.21 km was revealed using structural index (SI) of 1 while depth values of 2290.49 km to 4447.62 km and 925. 93 km to 5790.49 km was observed when SI of 2 and 3 respectively were chosen. This study presents, therefore, suitable sedimentary thickness for hydrocarbon exploration to exist within the area.
Źródło:
World Scientific News; 2018, 109; 26-42
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling the water absorption rate of wood impregnated with silicone-based chemicals using an artificial neural network
Autorzy:
Gurgen, A.
Kilic, C.
Yildiz, U.C.
Yildiz, S.
Powiązania:
https://bibliotekanauki.pl/articles/52900.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2019, 62, 204
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Issledovanija sovmestnojj raboty osvetljajushhejj centrifugi i ustanovki membrannojj ul'trafil'tracii
Researching the cooperation work of clarifying centrifuge and ultrafiltration membrane plant
Autorzy:
Ehpojan, S.
Karagjaur, A.
Babenko, C.
Golubka, A.
Powiązania:
https://bibliotekanauki.pl/articles/76321.pdf
Data publikacji:
2015
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
cooperation
experimental study
total suspended solid
water
filtration
theoretical study
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 6
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Simulations for Bobbin Tool Friction Stir Welding of Aluminum 6082-T6
Autorzy:
Hamilton, C.
Dymek, S.
Węglowska, A.
Pietras, A.
Powiązania:
https://bibliotekanauki.pl/articles/356155.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
friction stir welding
bobbin tool
aluminum
simulation
temperature
Opis:
Aluminum 6082-T6 panels were joined by friction stir welding utilizing a bobbin tool. A thermal simulation of the process was developed based upon machine torque and the temperature dependent yield stress utilizing a slip factor and an assumed coefficie nt of friction. The torque-based approach was compared to another simulation established on the shear layer methodology (SLM), which does not require the slip factor or coefficient of friction as model inputs. The SLM simulation, however, only models hea t generation from the leading edges of the tool. Ultimately, the two approaches yielded matching temperature predictions as both methodologies predicted the same overall total heat generation from the tool. A modified shear layer approach is proposed that adopts the flexibility and convenience of the shear layer method, yet models heat generation from all tool/workpiece interfaces.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 3; 1115-1123
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 530

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