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Wyszukujesz frazę "Selvakumar, K." wg kryterium: Autor


Wyświetlanie 1-6 z 6
Tytuł:
On the connectivity of the annihilating-ideal graphs
Autorzy:
Chelvam, T.
Selvakumar, K.
Powiązania:
https://bibliotekanauki.pl/articles/728900.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
annihilating-ideal graph
local ring
nilpotency
cut vertex
Opis:
Let R be a commutative ring with identity and *(R) the set of non-zero ideals with non-zero annihilators. The annihilating-ideal graph of R is defined as the graph (R) with the vertex set *(R) and two distinct vertices I₁ and I₂ are adjacent if and only if I₁I₂ = (0). In this paper, we examine the presence of cut vertices and cut sets in the annihilating-ideal graph of a commutative Artinian ring and provide a partial classification of the rings in which they appear. Using this, we obtain the vertex connectivity of some annihilating-ideal graphs.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2015, 35, 2; 195-204
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A note on ideal based zero-divisor graph of a commutative ring
Autorzy:
Mallika, A.
Kala, R.
Selvakumar, K.
Powiązania:
https://bibliotekanauki.pl/articles/38146701.pdf
Data publikacji:
2017-12-20
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
zero-divisor graph
chromatic number
ideal based zero divisor graph
clique number
Opis:
In this paper, we consider the ideal based zero divisor graph $Γ_I(R)$ of a commutative ring $R$. We discuss some graph theoretical properties of $Γ_I(R)$ in relation with zero divisor graph. We also relate certain parameters like vertex chromatic number, maximum degree and minimum degree for the graph $Γ_I(R)$ with that of $Γ(R/I)$. Further we determine a necessary and sufficient condition for the graph to be Eulerian and regular.
Źródło:
Discussiones Mathematicae - General Algebra and Applications; 2017, 37, 2; 177-187
1509-9415
Pojawia się w:
Discussiones Mathematicae - General Algebra and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the effect of composite constrained layers in vibration damping of plates
Autorzy:
Sasikumar, K. S. K.
Selvakumar, S.
Arulshri, K. P.
Powiązania:
https://bibliotekanauki.pl/articles/955317.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wibracja
kompozyty
lepkosprężystość
vibration
composite
viscoelastic
plates
Opis:
To add damping to the system, viscoelastic materials (VEM) are added to structures, in order to enhance damping effects of the VEM, a constraining layer is attached. Due to the addition of the material on the system the fundamental characteristics of the systems are altered much. This paper analyzes the damping effect of the constraining layer on plate type structures numerically using the FEM software ANSYS. Experiments are conducted to validate the analytical results. The use of weightless composite materials as constraining layers has been analyzed. Results are compared with the conventional constraining layer materials. The results showed that composite materials give a better damping effect without much altering the fundamental characteristics.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 1; 203-209
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Atmospheric Pressure Oxygen Plasma treatment on Bonding Characteristics of Basalt Fibre Reinforced Concrete
Wpływ obróbki plazmą pod ciśnieniem atmosferycznym na właściwości wiązania betonu zbrojonego włóknem bazaltowym
Autorzy:
Nandagopal, K. R.
Selvakumar, A.
Raja, D.
Powiązania:
https://bibliotekanauki.pl/articles/1857666.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:
basalt fibre
plasma treatment
pullout strength
debonding energy
włókno bazaltowe
obróbka plazmowa
siła wyrywająca
energia odklejania
Opis:
In this research work, the bonding characteristics of plasma treated basalt fibres were analysed by employing the fibre pull-out test. 80 samples were prepared with two different spans of basalt fibres (such as 25 mm and 50 mm) and four levels of embedded length (10, 15, 20 and 25) inside standard M20 grade concrete. Debonding and bonding characteristics of the plasma treated fibres were compared with raw basalt fibres through the fibre pull-out test. The plasma treated and raw basalt fibres were characterised through Field emission scanning electron microscope (FESEM) and Fourier transform infrared (FTIR) analysis. It was observed that confirmation of the presence of hydroxyl groups on the basalt fibre surface was realised through the FTIR test and that there was higher adsorption of concrete particles by the plasma treated basalt fibres through FESEM. The de bonding and fibre pull-out energy of the plasma treated basalt fibres were improved by about 9% and 10% compared with 25 mm and 50 mm raw basalt fibres. From the observation above, it can be stated that the Surface modification of basalt fibre may lead to a change in the debonding and pull-out energy level.
W pracy zostały przeanalizowane właściwości wiązania włókien bazaltowych poddanych obróbce plazmowej. Przygotowano 80 próbek dwóch różnych rodzajów włókien bazaltowych: 25 mm i 50 mm z czterema poziomami zatopionej długości (10, 15, 20 i 25) wewnątrz standardowego betonu klasy M20. Charakterystyki odklejania i wiązania włókien poddanych obróbce plazmowej porównano z surowymi włóknami bazaltowymi w teście wyciągania włókien. Obrobione plazmowo i surowe włókna bazaltowe scharakteryzowano za pomocą skaningowego mikroskopu elektronowego z emisją polową (FESEM) i analizy w podczerwieni z transformacją Fouriera (FTIR). Potwierdzenie obecności grup hydroksylowych na powierzchni włókna bazaltowego uzyskano za pomocą testu FTIR. Na podstawie wyników analizy FESEM stwierdzono, że nastąpiła większa adsorpcja cząstek betonu przez poddane obróbce plazmowej włókna bazaltowe. Rozwarstwianie i energia wyciągania włókien bazaltowych poddanych obróbce plazmowej uległy poprawie o około 9% i 10% w porównaniu z surowymi włóknami bazaltowymi 25 mm i 50 mm. Na podstawie przeprowadzonej obserwacji stwierdzono, że modyfikacja powierzchni włókna bazaltowego może prowadzić do zmiany poziomu energii odklejania i wyciągania.
Źródło:
Fibres & Textiles in Eastern Europe; 2021, 4 (148); 90-93
1230-3666
2300-7354
Pojawia się w:
Fibres & Textiles in Eastern Europe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the Mechanical and Electrical Properties of Spark Plasma Sintered Titanium Carbide Reinforced Alumina Ceramic Composite
Autorzy:
Selvakumar, G.
Prakash, S. Ram
Rajkumar, K.
Powiązania:
https://bibliotekanauki.pl/articles/2049356.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Spark Plasma Sintering
alumina composite
TiC
mechanical properties
fracture toughness
Opis:
Spark Plasma Sintering (SPS) is identified as a suitable technique to prepare the alumina titanium carbide composite to overcome the difficulty in fabricating it through other consolidation method. The present work focuses on the fabrication and characterization of a series of titanium carbide reinforced alumina ceramic composites using a spark plasma sintering process. The titanium carbide reinforcement on the alumina matrix is varied between 20 and 35 wt.%, in order to improve the electrical conductivity and fracture toughness of the composites. The particle size of the starting powders at received and ball milled conditions was analysed through Particle size analyser and Scanning Electron Microscope (SEM). Microstructural analysis revealed that the TiC reinforcement is uniformly dispersed in the sintered composite. XRD report showed that α-alumina and titanium carbide were the two dominant phases without the formation of any reaction phases. Further, the correlation between mechanical and physical properties of the prepared composite was investigated as a function of TiC. Various fracture toughening indicators like crack deflection, bridging and branching were analysed by Vicker’s indentation method. Electrical resistivity of the sintered compact decreases proportionally with the increase in titanium carbide constituents. Maximum density (98.80%) and hardness (20.56 GPa) was obtained for 30 wt. % reinforced composite. Almost 40% improvement in fracture toughness is noted for 25 wt. % reinforced composite. This work demonstrates the synthesis and fabrication of alumina titanium carbide composites at low temperature via SPS resulted in obtaining an intact compact with improved mechanical and electrical properties.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 3; 831-838
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation on the Effect of Technological Parameters on Emission Factor in 316L Stainless Steel Using Gas Metal Arc Welding
Autorzy:
Satheesh Kumar, K. V.
Selvakumar, P.
Uvanshankar, K. R.
Thirunavukaras, U. S.
Anand, Vijay V.
Vishal, D.
Powiązania:
https://bibliotekanauki.pl/articles/2049738.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
emission factor
shielding gas
Permissible Exposure Limit
health hazards
glass fiber filter
Opis:
Growing awareness for occupational safety in the welding environment needs a sustainable welding system. Welding gases releases toxic tiny particles and gases that inflict severe health consequences in the weld zone are unsolicited. Some of the other main adverse effects are lung disease, hemoptysis, pulmonary inflammation, pneumoconiosis, etc. GMAW procedure has been used for welding 316L stainless steel plates of 3 mm, 5 mm, and 6 mm. Various current configurations with gas flow rate of 5 LPM, 10 LPM and 15 LPM were also used to achieve optimum butt joint performance and to reduce the production rate of fume contributing to cost-effectiveness. In this research a cost-effective fume extraction hood was fabricated for measuring emission factor produced during welding. Various shielding gas compositions including Pure Argon, Pure CO2, 92% Ar+8% CO2 and 88% Ar+12% CO2were used to determine the best operating parameters in the GMAW method. To satisfy the latest Permissible Exposure Limit (PEL) legislation, optimum technical parameters for efficient welding were acknowledged with the lowest emission factor. A maximum reduction of emission factor can be achieved by using Pure Argon. The inclusion of CO2 as a shielding gas mixture gives higher emission factor when compared to Pure Argon. Very low emission factor were witnessed in this research when compared to previous investigations. Lower emission factor of 2941.17 mg /kg of electrode, 4411.76 mg/kg of electrode and 7352.94 mg/kg of electrode were obtained for pure argon as shielding gas with 150 A welding current.
Źródło:
Archives of Metallurgy and Materials; 2021, 66, 2; 609-615
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

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