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    Wyświetlanie 1-48 z 48
    Tytuł:
    In vitro seed germination and Embryo Culture in Nothapodytes foetida (Wight) Sleumer
    Autorzy:
    Kaveri, S.
    Rao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/10761.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    In vitro seed germination and embryo culture have been achieved in Nothapodytes foetida, this plant is known for its rich source of anticancer drug i. e., Camptothecin. In present study both normal and decoated seeds were subjected to different treatments viz., H2O, GA3, H2O2, H2SO4, chlorine water and mechanical scarification, further these were germinated on water agar medium (WA), filter paper bridge (FB), half strength MS (HMS) and full strength MS (FMS) medium. The highest percentage (69%) of germination was achieved from decoated seeds treated with 10mg/L GA3 and germinated on Filter Paper Bridge. And for embryo culture mature embryos were inoculated on MS medium containing various combination and concentrations of cytokinins (BAP, Kn and TDZ) and auxin (IAA and NAA) for rapid conversion into a plantlet. Among the different combinations of growth regulators; highest frequency (100%) of plantlet conversion was obtained on MS medium containing Kn (1.0mg/L) and NAA (0.2mg/L).
    Źródło:
    International Letters of Natural Sciences; 2015, 48
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Convexity of a class of functions related to classes of starlike functions and functions with boundary rotation
    Autorzy:
    Bhargava, S.
    Nanjunda Rao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/716237.pdf
    Data publikacji:
    1989
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Źródło:
    Annales Polonici Mathematici; 1988-1989, 49, 3; 229-235
    0066-2216
    Pojawia się w:
    Annales Polonici Mathematici
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Callus induction and Organogenesis in Sugarcane (Saccharum officinarum L.) var 93v297
    Autorzy:
    Rao, A.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/11297.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    An efficient protocol for induction of callus and regeneration of a sugar cane var 93v297 has been developed and reported here. Callus induction from immature young leaf explants derived from 2-3-month-old plants was achieved on Murashige and Skoog’s (MS) medium supplemented with different auxins viz, 2,4-D, NAA and IAA. Among different auxins, 2, 4-D at 3.5mg/l + 0.5mg/l BAP was found favourable in inducing callus. Addition of coconut milk and BAP further enhanced the growth of callus maximum being on MS medium supplemented with 0.5mg/l BAP (3602.33±0.88mg). Calli were further evaluated for regeneration. MS medium supplemented with 1.0 mg/l BAP was found suitable where 100% calli regenerated with maximum number of multiple shoots per callus mass (41.40±0.89). Highest number of root emergence (28.33±1.16) and maximum root length (3.40±0.67cm) was achieved on MS medium supplemented with 3mgl/l NAA. The in vitro grown plants were transferred to polycups containing a mixture of sterilized sand, soil and cocopeet (1:1:1) for hardening. The hardened plants were transferred to green-house conditions where they survived with 90% frequency.
    Źródło:
    International Letters of Natural Sciences; 2015, 48
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid effects of stirrup ratio and steel fibers on shear behaviour of self-compacting concrete
    Hybrydowy wpływ stosunku strzemion i włókien stalowych na ścinanie betonu samozagęszczalnego
    Autorzy:
    Kannam, P.
    Venkateswara Rao, S.
    Pancharathi, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/230257.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beton samozagęszczalny
    wytrzymałość na ścinanie
    beton zbrojony
    ścinanie spowodowane zginaniem
    strzemiono
    włókno stalowe
    self compacting concrete
    shear strength
    reinforced concrete
    flexural-shear failure
    stirrup
    steel fiber
    Opis:
    Shear cracking behaviour of fibrous self-compacting concrete of normal and high strength grade (M30 and M70) is presented here. Two stirrup diameters (6mm Φ and 8 mm Φ) with a constant steel fiber content of 38 kg/m3 (0.5% by volume of concrete) were selected for the present study. The size of the beam was fixed at 100x200x1200mm. The clear span of the beam 1100mm, was maintained throughout the study. A total of 16 shear-deficient beams were tested under three point loading. Two stirrup spacing (180 mm and 360 mm) are used for the shear span-to-depth ratio (a/d = 2). Investigation indicates that initial cracking load and ultimate load increased as the area of shear reinforcement increased by increasing the diameter of stirrup. It was also noted that the failure mode was modified from brittle shear failure to flexural-shear failure in the presence of fibers. The mechanical behaviour of SFRSCC was improved due to the combined effect of stirrups and steel fibers. The stiffness, toughness, and deflection of the beams increased when compared to SCC beams without fibers. The experimental results were compared with existing models available in literature, and the correlation is satisfactory.
    Spośród wszystkich rodzajów uszkodzeń betonu, ścinanie jest nagłe i kruche i pojawia się gwałtownie, bez ostrzeżenia. Aby uniknąć tego rodzaju problemów z betonem, belki są tradycyjnie wzmacniane za pomocą strzemion, w bliższej odległości od konstrukcji. Ograniczone rozmieszczenie prętów zbrojeniowych i strzemion na elementach wykonanych z betonu zbrojonego (RC), takich jak słupy, belki i płyty, utrudnia zagęszczanie betonu w każdym miejscu w szalunku za pomocą wibratorów mechanicznych. Pustki i makropory wewnątrz betonu powstają w wyniku nieodpowiednich drgań, a zatem zagęszczenie może wpływać na wytrzymałość mechaniczną i trwałość betonu, a także stać się możliwą przyczyną pogorszenia jego jakości. Beton konwencjonalny stosowany w budownictwie i inżynierii lądowej wymaga zagęszczania w celu uzyskania wytrzymałości, trwałości i konsystencji. Ta klasyczna metoda zagęszczania i drgań powoduje zakłócenia i dodatkowe koszty dla projektów, a ponadto stanowi poważne zagrożenie dla zdrowia na i w okolicach placu budowy. Beton samozagęszczalny (SCC), jak sama nazwa wskazuje, nie wymaga zewnętrznego wysiłku przy zagęszczaniu. Jest to dobrze przemyślane rozwiązanie, mające na celu pozbycie się powyższego problemu. Ze względu na wyżej opisaną właściwość, nie potrzeba drgań, a więc nie powstają również zanieczyszczenia hałasem, zmniejszają się koszty robocizny i beton może być zagęszczany w każdym miejscu szalunku, bez jakiejkolwiek znaczącej segregacji, przeważnie w zatkanych wzmocnieniach. W niniejszej pracy przedstawiono charakterystykę pękania przy ścinaniu włóknistego betonu samozagęszczalnego o normalnym i wysokim stopniu wytrzymałości (M30 i M70). W niniejszej pracy zastosowano dwie średnice strzemion (6 mm i 8 mm) o stałej zawartości włókien stalowych wynoszącej 38 kg/m3 (0.5% objętości betonu). Rozmiar belki został ustalony na 100 x 200 x 1200 mm. Przez cały okres trwania badania utrzymywano rozstaw belek wynoszący 1100 mm. Łącznie zbadano 16 belek z niedostatnim ścinaniem przy obciążeniu trzypunktowym. Dwa rozstawy strzemion (180 mm i 360 mm) są stosowane dla stosunku ścinania do głębokości (a/d = 2). Badanie wykazało, że początkowe obciążenie przy pękaniu oraz końcowe obciążenie wzrosły wraz ze wzrostem średnicy strzemienia. Zauwaono również, ze tryb awaryjny zmienił sie z kruchego ścinania na scinanie spowodowane zginaniem przy obecności włókien. Zachowanie mechaniczne SFRSCC uległo poprawie w wyniku połączonego efektu działania strzemion i włókien stalowych. Sztywność, wytrzymałość i ugięcie belek wzrosły w porównaniu do belek SCC bez włókien. Wyniki eksperymentalne zostały porównane z istniejącymi modelami dostępnymi w literaturze, a korelacja okazała się być zadowalająca.
    Źródło:
    Archives of Civil Engineering; 2018, 64, 1; 145-169
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors affecting the mechanical properties of compact bone and miniature specimen test techniques: a review
    Autorzy:
    Chittibabu, V.
    Rao, S. K.
    Rao, G. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/103085.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    mechanical properties
    compact bone
    miniature specimen
    small punch test
    finite element simulation
    inverse finite element procedure
    Opis:
    This paper presents the review concerning mechanical properties of bone and the miniature specimen test techniques. For developing a realistic understanding of how factors such as moisture content, mineralization, age, species, location, gender, rate of deformation etc. affect the mechanical properties of bone, it is critical to understand the role of these factors. A general survey on existing research work is presented on this aspect. The essential features of miniature specimen test techniques are described, along with the application of small punch test method to evaluate the mechanical behavior of materials. The procedure for the determination of tensile and fracture properties, such as: yield strength, ultimate strength, ductility, fracture toughness etc. using small punch test technique have been described. The empirical equations proposed by various investigators for the prediction of tensile and fracture properties are presented and discussed. In some cases, the predictions of material properties have been essentially made through the finite element simulation. The finite element simulation of miniature specimen test technique is also covered in this review. The use of inverse finite element procedure for the prediction of uniaxial tensile constitutive behaviour of materials is also presented.
    Źródło:
    Advances in Science and Technology. Research Journal; 2016, 10, 32; 169-183
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methanogens in the environment: an insight of methane yield and impact on global climate change
    Autorzy:
    Kumar Pandey, A.
    Das, N.
    Muthu Kumar, A.
    Rao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/11130.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    Methane is a most important greenhouse gas for planetary heating and it’s produced by methanogenic microorganisms as a metabolic byproduct and creates climate change. Methanogens are ancient organisms on earth found in anaerobic environments and methane is a key greenhouse gas concerned with methanogens. Therefore here is intense interest to writing this paper. A number of experiments have already conducted to study the methanogens in various environments such as rumen and intestinal system of animals, fresh water and marine sediments, swamps and marshes, hot springs, sludge digesters, and within anaerobic protozoa which utilize carbon dioxide in the presence of hydrogen and produce methane. The diversity of methanogens, belong to the domain Archaea and get involved in biological production of methane that catalyzes the degradation of organic compound as a part of global carbon cycle called methanogenesis. Majorly in this article we summaries the diversity of methanogens and their impact on global warming.
    Źródło:
    International Letters of Natural Sciences; 2015, 37
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A report on occurrence of Neofusicoccum sp. in Carallia brachiata (Lour.) Merr. trees from Karnataka, India
    Autorzy:
    Muthu Kumar, A.
    Pandey, A.K.
    Mishra, G.
    Rao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/11572.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    Carallia brachiata (Lour.) Merr. is one of the soft woody species occurring all along the Western Ghats region of Kundapura, Karnataka, India. The species is considered to be a potent medicinal plant exclusively used against itch and septic poisoning. A study was under gone based on the report of forest department (Karnataka) on mortality of Carallia brachiata. Observation of symptoms on the infected trees and experimental analysis of the samples under laboratory conditions revealed the incidence of Neofusicoccum sp., a first report on Carallia brachiata. This particular Neofusicoccum sp. belongs to Botryospaeriaceae family, and is considered to be an important fungal pathogen associated with tree decline in forest and plantation worldwide.
    Źródło:
    International Letters of Natural Sciences; 2015, 04
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Global scenario of Acrocarpus fraxinifolius Wight and Arn. - A future tree of Agro forestry
    Autorzy:
    Mishra, G.
    Pandey, A.K.
    Arunachalam, M.K.
    Rao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/11909.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    Acrocarpus fraxinifolius portrait one among the mainstay of agro forestry in Asian tropics. The lofty tree fortified a substantial impact in every horizon of life. The evergreen, deciduous tree of Fabaceae family stands tall about 30-60 m endowed with unique properties which idiosyncrasies it in the plant kingdom. Surpassing the adverse climatic conditions, A. fraxinifolius serves as a shade tree for tea and coffee plantation and epitomises as a multipurpose avenue tree culminating to the culture of agro forestry. Mundani in bloom is a spectacular appearance bestowed with scarlet crimson red flowers attracting infinite migratory birds and insects. The ancestral gene with indelible memory gravitate this extraordinary majestic tree to aestivate and adapt to strongest survive.
    Źródło:
    International Letters of Natural Sciences; 2015, 03
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Dynamics of the Forest Graph Operator
    Autorzy:
    Dara, Suresh
    Hegde, S.M.
    Deva, Venkateshwarlu
    Rao, S.B.
    Zaslavsky, Thomas
    Powiązania:
    https://bibliotekanauki.pl/articles/31340605.pdf
    Data publikacji:
    2016-11-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    forest graph operator
    graph dynamics
    Opis:
    In 1966, Cummins introduced the “tree graph”: the tree graph \( \textbf{T} (G) \) of a graph \( G \) (possibly infinite) has all its spanning trees as vertices, and distinct such trees correspond to adjacent vertices if they differ in just one edge, i.e., two spanning trees \( T_1 \) and \( T_2 \) are adjacent if \( T_2 = T_1 − e + f \) for some edges \( e \in T_1 \) and \( f \notin T_1 \). The tree graph of a connected graph need not be connected. To obviate this difficulty we define the “forest graph”: let \( G \) be a labeled graph of order \( \alpha \), finite or infinite, and let \( \mathfrak{N}(G) \) be the set of all labeled maximal forests of \( G \). The forest graph of \( G \), denoted by \( \textbf{F} (G) \), is the graph with vertex set \( \mathfrak{N}(G) \) in which two maximal forests \( F_1 \), \( F_2 \) of \( G \) form an edge if and only if they differ exactly by one edge, i.e., \( F_2 = F_1 − e + f \) for some edges \( e \in F_1 \) and \( f \notin F_1 \). Using the theory of cardinal numbers, Zorn’s lemma, transfinite induction, the axiom of choice and the well-ordering principle, we determine the F-convergence, F-divergence, F-depth and F-stability of any graph \( G \). In particular it is shown that a graph \( G \) (finite or infinite) is F-convergent if and only if \( G \) has at most one cycle of length 3. The F-stable graphs are precisely \( K_3 \) and \( K_1 \). The F-depth of any graph \( G \) different from \( K_3 \) and \( K_1 \) is finite. We also determine various parameters of \( \mathbf{F} (G) \) for an infinite graph \( G \), including the number, order, size, and degree of its components.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2016, 36, 4; 899-913
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A hybridized approach for design and optimization of ORPD under unbalanced conditions
    Autorzy:
    Shareef, S. M.
    Rao, R. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839102.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    ORPD
    power loss
    voltage profile
    Cuckoo Search
    Glow Worm Swarm
    Opis:
    The issue of ORPD (Optimal Reactive Power Dispatch) for enhancing security and economy of a power system has been given substantial consideration in recent days. The major inspiration behind deploying an ORPD system for enhancing power system efficiency is to reallocate the RP (reactive power) in such a manner that power loss be minimized, and voltage profiles get enhanced. Hence, this paper concerns the major objectives, namely, reduction of power loss and voltage deviation that are related to solving ORPD problem under unbalanced condition. To attain these objectives, an amalgamation of two algorithms, called CS (Cuckoo Search) and GWSO (Glow Worm Swarm), is adopted for optimizing, and hence the proposed model is referred to as CP-GWSO. This algorithm functions with the control parameters, namely load reactance, voltage and transformer tap settings that are tuned to attain the optimum outcome. The entire empirical part of the investigations is performed on two IEEE standard test bus systems, the IEEE 14 and the IEEE 39 bus systems. Finally, the proposed scheme is compared to the conventional methods, and its efficiency is confirmed.
    Źródło:
    Control and Cybernetics; 2018, 47, 4; 309-328
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of knock suppression characteristics in a boosted methane : gasoline blended fuelled SI engine
    Autorzy:
    Yang, Z.
    Miganakallu, N.
    Rao, S.
    Harsulkar, J.
    Naber, J.
    Lonari, Y.
    Szwaja, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/244629.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    knock
    methane
    gasoline
    E10
    blend fuel
    knock onset prediction
    simulation
    Opis:
    Natural gas has a higher knock suppression effect than gasoline which makes it possible to operate at higher compression ratio and higher loads resulting in increased thermal efficiency in a spark ignition engine However, using port fuel injected natural gas instead of gasoline reduces the volumetric efficiency from the standpoints of the charge displacement of the gaseous fuel and the charge cooling that occurs from liquid fuels. This article investigates the combustion and engine performance characteristics by utilizing experimental and simulation methods varying the natural gas-gasoline blending ratio at constant engine speed, load, and knock level. The experimental tests were conducted on a single cylinder prototype spark ignited engine equipped with two fuel systems: (i) a Direct Injection system for gasoline and (ii) a Port Fuel Injection (PFI) system for compressed natural gas. For the fuels, gasoline with 10% ethanol by volume (commercially known as E10) with a research octane number of 91.7 is used for gasoline via the DI system, while methane is injected through PFI system. The knock suppression tests were conducted at 1500 rpm, 12 bar net indicated mean effective pressure wherein the engine was boosted using compressed air. At 60% of blending methane with E10 gasoline, the results show high knock suppression. The net indicated specific fuel consumption is 7% lower, but the volumetric efficiency is 7% lower compared to E10 gasoline only condition. A knock prediction model was calibrated in the 1-D simulation software GT-Power by Gamma Technologies. The calibration was conducted by correlating the simulated engine knock onset with the experimental results. The simulation results show its capability to predict knock onset at various fuel blending ratios.
    Źródło:
    Journal of KONES; 2018, 25, 3; 517-525
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    QoS-based Joint User Selection and Scheduling for MU-MIMO WLANs
    Autorzy:
    Rao, D. S.
    Hency, V. D. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/309403.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    802.11ac
    CSI
    delay
    MMSE
    throughput
    Opis:
    The shift in Multi-User Multiple Input Multiple Output (MU-MIMO) has gained attention due to its wide support in very high throughput Wireless Local Area Networks (WLANs) such as the 802.11ac. However, the full advantage of MU-MIMO can be utilized only with proper user selection and scheduling. Also, providing Quality of Service (QoS) support is a major challenge for these wireless networks. Generally, user scheduling is done with the acquisition of Channel State Information (CSI) from all the users. In MU-MIMO based WLANs, the number of CSI request increases with the number of users. This results in an increased CSI overhead and in degradation of the overall throughput. Most of the proposals in the literature have not addressed the contention in the CSI feedback clearly. Hence, in this paper a Joint User Selection and Scheduling (JUSS) scheme is discussed and its performance is evaluated in terms of throughput, delay, packet loss and fairness. In the performance comparison some wellknown Medium Access Control (MAC) protocols are considered. The proposed scheme not only enhances throughput, but also avoids contention during CSI feedback period.
    Źródło:
    Journal of Telecommunications and Information Technology; 2017, 4; 17-24
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of policies to reduce transportation pollution using system dynamics
    Autorzy:
    Manohar, G.
    Devi, S. P.
    Rao, K. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/208080.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    road transport
    road pollutants
    road transport emissions
    vehicle emissions
    transport drogowy
    zanieczyszczenia drogowe
    emisje motoryzacyjne
    emisja komunikacyjna
    emisja zanieczyszczeń komunikacyjnych
    emisja zanieczyszczeń samochodowych
    Opis:
    Pollution caused by road transportation is the major factor affecting human health and adversely affecting the global warming. In the study, a system dynamics model has been applied to forecast vehicle emissions from road transport to evaluate policies in the transportation management. The proposed model was applied to evaluate and compare three transportation policy scenarios including road expansion, public transit incentive and enforcement of quality norms for vehicles. The pollution emission data is taken in Chennai, Tamil Nadu. The pollution in the study area will increase substantially if no management plans are implemented. The impact of population increase on transportation pollution has also been considered. It was found that among the proposed policies, implementation of the transit incentive policy to adopt public transports and the implementation of Bharat Stage IV norms for vehicles proved to be efficient in reducing the transport pollution to a great extent.
    Źródło:
    Environment Protection Engineering; 2014, 40, 4; 143-153
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-enzymatic browning and flavour kinetics of vacuum dried onion slices
    Autorzy:
    Mitra, J.
    Shrivastava, S.L.
    Rao, P.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/24489.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    non-enzymatic browning
    flavour kinetics
    vacuum drying
    onion slice
    rehydration ratio
    Opis:
    Onion slices were dehydrated under vacuum to produce good quality dried ready-to-use onion slices. Colour development due to non-enzymatic browning and flavour loss in terms of thiosulphinate concentration was determined, along with moisture content and rehydration ratio. Kinetics of non-enzyma-tic browning and thiosulphinate loss during drying was analysed. Colour change due to non-enzymatic browning was found to be much lower in the case of vacuum dried onion, and improved flavour retention was observed as compared to hot air dried onion slices. The optical index values for non-enzymatic browning varied from 18.41 to 38.68 for untreated onion slices and from 16.73 to 36.51 for treated slices, whereas thiosulphinate concentration in the case of untreated onion slices was within the range of 2.96-3.92 μmol g-1 for dried sample and 3.71-4.43 μmol g-1 for the treated onion slices. Rehydration ratio was also increased, which may be attributed to a better porous structure attained due to vacuum drying. The treatment applied was found very suitable in controlling non-enzymatic browning and flavour loss during drying, besides increasing rehydration ratio. Hence, high quality dried ready- to-use onion slices were prepared.
    Źródło:
    International Agrophysics; 2015, 29, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of flow pattern on a hydrofoil with structural and profile modification
    Autorzy:
    Chada, Jithendra Sai Raja
    Rao, B. S. V. Rama
    Powiązania:
    https://bibliotekanauki.pl/articles/2106431.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    hydrofoil
    groves
    angle of attack
    CFD
    fine mesh
    validation
    wodolot
    kąt natarcia
    walidacja
    Opis:
    Moving through water takes much more effort than walking through air, and this explains why ships travel much more slowly than automobiles and aircraft. Water is almost 1000 times denser than air, so most of the energy produced by a boat is taken up by dragging (water resistance). Hydrofoils travel much more quickly than ordinary boats, not by pushing through water but by raising the hull (the main body) of the boat upward so it can glide above the waves. Hydrofoil is one of the typical factors that affect the vortex structure and flow characteristics of hydraulic machinery. In order to enhance the utilisation efficiency of hydraulic machinery in marine energy, parallel grooves are proposed and applied to the hydrofoil. Following that, a numerical analysis is performed using the SST k- turbulence model, and the effects of the hydrofoil profile, the angle of attack and the flow are investigated. The profiles of NACA 0066, NACA 8412, NACA M2 and RAE 104 are considered for the study. The performance is analysed based on the lift to drag ratio. The best model from this is given with surface modification and the flow study is carried out at different angles of attack. The modified profile of NACA 8412 with parallel groves has shown the highest lift to drag ratio at a 12 degree angle of attack.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2022, 6, 1; 27--32
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cobalt-rich lithiophorite from the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India
    Autorzy:
    Rao, D. S.
    Nayak, B. K.
    Acharya, B. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086547.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Mineralogiczne
    Tematy:
    Nishikhal
    manganese ore
    lithiophorite
    mineral chemistry
    Opis:
    Fine-grained aggregates of lithiophorite are associated with cryptomelane, romanèchite, birnessite and graphite in the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India. High-cobalt lithiophorite is reported for the first time from the manganese ores. The mode of occurrence and the chemical composition of the lithiophorite are discussed. Along with manganese and aluminium, the lithiophorite contains appreciable quantities of CoO (1.59-8.56%) together with trace amounts of Cu, Ni, Zn, Ti, Ca, Mg, Na, K and P. The Nishikhal lithiophorite is a transition metal-rich lithiophorite.
    Źródło:
    Mineralogia; 2010, 41, 1/2; 11--21
    1899-8291
    1899-8526
    Pojawia się w:
    Mineralogia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric Optimization for Producing Semi-Solid A383 Alloy using Cooling Slope Casting Process
    Autorzy:
    Rao, M. S.
    Khandelwal, Himandshu
    Kumar, M.
    Kumar, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/27314114.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    alloy A383
    semi-solid alloys
    casting process
    cooling
    hardness
    non-dendritic microstructur
    stop A383
    stopy półstałe
    proces odlewania
    chłodzenie
    twardość
    mikrostruktura
    Opis:
    Cooling slope casting is a simple technique to produce semi-solid feedstock with a non-dendritic structure. The cooling slope technique depends on various parameters like slope length, slope angle, pouring temperature etc, that has been investigated in the present study. This work presents an extensive study to comprehend the combined effect of slope angle, slope length, pouring temperature, on hardness and microstructure of A383 alloy. Response Surface Methodology was adopted for design of experiments with varying process parameters i.e. slope angle between 15o to 60o, slope length between 400 to 700 mm, and pouring temperature between 560 oC to 600 oC. The response factor hardness was analysed using ANOVA to understand the effect of input parameters and their interactions. The hardness was found to be increasing with increased slope length and pouring temperature; and decreased with slope angle. The empirical relation for response with parameters were established using the regression analysis and are incorporated in an optimization model. The optimum hardness with non-dendritic structure of A383 alloy was obtained at 27o slope angle, 596.5 mm slope length and 596 oC pouring temperature. The results were successfully verified by confirmation experiment, which shows around 2% deviation from the predicted hardness (87.11 BHN).
    Źródło:
    Archives of Foundry Engineering; 2023, 23, 1; 43--52
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cobalt-rich lithiophorite from the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India
    Autorzy:
    Rao, Danda S.
    Nayak, Bijaya K.
    Acharya, Bhaskar C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086504.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Mineralogiczne
    Tematy:
    Nishikhal
    manganese ore
    lithiophorite
    mineral chemistry
    Opis:
    Fine-grained aggregates of lithiophorite are associated with cryptomelane, romanèchite, birnessite and graphite in the Precambrian Eastern Ghats manganese ore deposit of Nishikhal, south Orissa, India. High-cobalt lithiophorite is reported for the first time from the manganese ores. The mode of occurrence and the chemical composition of the lithiophorite are discussed. Along with manganese and aluminium, the lithiophorite contains appreciable quantities of CoO (1.59-8.56%) together with trace amounts of Cu, Ni, Zn, Ti, Ca, Mg, Na, K and P. The Nishikhal lithiophorite is a transition metal-rich lithiophorite.
    Źródło:
    Mineralogia; 2010, 41, 1/2; 11--21
    1899-8291
    1899-8526
    Pojawia się w:
    Mineralogia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Studies on Distorted Structure Nanomolecules by Using Lie Algebraic Model
    Autorzy:
    Rao Karumuri, S.
    Girija Sravani, K.
    Vijayshekar, J.
    Reddy, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419693.pdf
    Data publikacji:
    2012-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Fd
    07.57.-c
    02.20.Sv
    78.30.Na
    Opis:
    We have applied Lie algebraic model to distorted structure molecules to determine the vibrational spectra of different stretching and bending vibrational modes. The the Lie algebraic model of the Hamiltonian expression is H = $E_0 + \sum_{i = 1}^{n} A_{i} C_{i} + \sum_{i < j}^{n} A_{ij} C_{ij} + \sum_{i < j}^{n} \lambda_{ij} M_{ij}$. By using the Lie algebraic method, the stretching vibrational energies of fullerene $(C_{80})$ are calculated in the one-dimensional [U(2)] framework. Using the model Hamiltonian so constructed, we have calculated the local mode vibrational energy levels of the fullerene $(C_{80})$ accurately.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 1; 49-52
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Free vibrations analysis of shrouded bladed discs with one loose blade
    Autorzy:
    Rządkowski, R.
    Kwapisz, L.
    Drewczyński, M.
    Szczepanik, R.
    Rao, J.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955347.pdf
    Data publikacji:
    2006
    Wydawca:
    Politechnika Gdańska
    Tematy:
    blade
    shrouded bladed disc
    free vibration
    Opis:
    As a failure of rotor blades in a gas turbine was reported, the rotating-mode shapes of flexible shrouded bladed disc assemblies were calculated using a finite element approach. Rotational effects, such as centrifugal stiffening were accounted for, and all couplings between the flexible parts were allowed. The spin softening effects were neglected. A dynamic analysis of the shrouded bladed disc demonstrated that it was designed with a sufficient safety region of resonance. In case of one blade getting loose, it is vibrating in resonance.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2006, 10, 1; 83-95
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Completeness of $L_1$ spaces over finitely additive probabilities
    Autorzy:
    Gangopadhyay, S.
    Rao, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1396052.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    Sobczyk-Hammer decomposition
    Hewitt-Yosida decomposition
    $L_1$ space
    strategic products
    Źródło:
    Colloquium Mathematicum; 1999, 80, 1; 83-95
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Loadability maximisation in bilateral network for real-time forecasting system using cuckoo search algorithm
    Autorzy:
    Venkatasivanagaraju, S.
    Rao, M. Venkateswara
    Powiązania:
    https://bibliotekanauki.pl/articles/38699704.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    optimal power flow
    NR method
    short-term load forecasting
    long-term load forecasting
    cuckoo search algorithm
    optimisation
    loss minimisation
    optymalny przepływ mocy
    metoda NR
    krótkoterminowe prognozowanie obciążeń
    długoterminowe prognozowanie obciążeń
    algorytm kukułki
    optymalizacja
    minimalizacja strat
    Opis:
    This manuscript proposes an optimal power flow (OPF) solution in a coordinated bilateralpower network. The primary goal of this project is to maximise the benefits of the powermarket using Newton–Raphson (NR) and cuckoo search algorithm CSA methodologies.The global solution is found using a CSA-based optimisation approach. The study isconducted on real-time bus system. To avoid this, creative techniques have lately beenused to handle the OPF problem, such as loadability maximisation for real-time predictionsystems employing the CSA. In this work, cuckoo search (CS) is used to optimise theobtained parameters that help to minimise parameters in the predecessor and consequentunits of each sub-model. The proposed approach is used to estimate the power load in thelocal area. The constructed models show excellent predicting performance based on derivedperformance. The results confirm the method’s validity. The outcomes are compared withthose obtained by using the NR method. CSA outperformed the other methods in thisinvestigation and gave more accurate predictions. The OPF problem is solved via CSAin this study. Implementing a real-time data case bus system is recommended to test theperformance of the established method in the MATLAB programme.
    Źródło:
    Computer Assisted Methods in Engineering and Science; 2023, 30, 1; 73-88
    2299-3649
    Pojawia się w:
    Computer Assisted Methods in Engineering and Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An automatic hybrid method for retinal blood vessel extraction
    Autorzy:
    Yang, Y.
    Huang, S.
    Rao, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/907899.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    naczynie krwionośne
    ekstrakcja
    obraz
    siatkówka
    morfologia matematyczna
    grupowanie rozmyte
    blood vessel extraction
    retinal image
    mathematical morphology
    fuzzy clustering
    Opis:
    The extraction of blood vessels from retinal images is an important and challenging task in medical analysis and diagnosis. This paper presents a novel hybrid automatic approach for the extraction of retinal image vessels. The method consists in the application of mathematical morphology and a fuzzy clustering algorithm followed by a purification procedure. In mathematical morphology, the retinal image is smoothed and strengthened so that the blood vessels are enhanced and the background information is suppressed. The fuzzy clustering algorithm is then employed to the previous enhanced image for segmentation. After the fuzzy segmentation, a purification procedure is used to reduce the weak edges and noise, and the final results of the blood vessels are consequently achieved. The performance of the proposed method is compared with some existing segmentation methods and hand-labeled segmentations. The approach has been tested on a series of retinal images, and experimental results show that our technique is promising and effective.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2008, 18, 3; 399-407
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A supervised approach to musculoskeletal imaging fracture detection and classification using deep learning algorithms
    Autorzy:
    Karanam, Santoshachandra Rao
    Srinivas, Y.
    Chakravarty, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/38702595.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    musculoskeletal image
    image processing
    image enhancement
    fracture diagnosis
    fracture classification
    deep neural network
    obraz układu mięśniowo-szkieletowego
    przetwarzanie obrazu
    wzmocnienie obrazu
    diagnoza złamania
    klasyfikacja złamań
    głęboka sieć neuronowa
    Opis:
    Bone fractures break bone continuity. Impact or stress causes numerous bone fractures. Fracture misdiagnosis is the most frequent mistake in emergency rooms, resulting in treatment delays and permanent impairment. According to the Indian population studies, fractures are becoming more common. In the last three decades, there has been a growth of 480 000, and by 2022, it will surpass 600 000. Classifying X-rays may be challenging, particularly in an emergency room when one must act quickly. Deep learning techniques have recently become more popular for image categorization. Deep neural networks (DNNs) can classify images and solve challenging problems. This research aims to build and evaluate a deep learning system for fracture identification and bone fracture classification (BFC). This work proposes an image-processing system that can identify bone fractures using X-rays. Images from the dataset are pre-processed, enhanced, and extracted. Then, DNN classifiers ResNeXt101, InceptionResNetV2, Xception, and NASNetLarge separate the images into the ones with unfractured and fractured bones (normal, oblique, spiral, comminuted, impacted, transverse, and greenstick). The most accurate model is InceptionResNetV2, with an accuracy of 94.58%.
    Źródło:
    Computer Assisted Methods in Engineering and Science; 2023, 30, 3; 369-385
    2299-3649
    Pojawia się w:
    Computer Assisted Methods in Engineering and Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of thermal modulation on double diffusive convection in the presence of applied magnetic field and internal heat source
    Autorzy:
    Manjula, S. H.
    Suresh, P.
    Rao, M. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839901.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    analiza nieliniowa
    płyn newtonowski
    konwekcja
    thermal modulation
    weak nonlinear analysis
    internal heating
    newtonian fluid
    double diffusive convection
    Opis:
    The investigation of thermal modulation on double-diffusive stationary convection in the presence of an applied magnetic field and internal heating is carried out. A weakly nonlinear stability analysis has been performed using the finite-amplitude Ginzburg-Landau model. This finite amplitude of convection is obtained at the third order of the system. The study considers three different forms of temperature modulations. OPM-out of phase modulation, LBMO-lower boundary modulation, IPM-in phase modulation. The finite-amplitude is a function of amplitude ,Tδ frequency ω and the phase differenceθ . The effects of Tδ and ω on heat/mass transports have been analyzed and depicted graphically. The study shows that heat/mass transports can be controlled effectively by thermal modulation. Further, it is found that the internal Rayleigh number iR enhances heat transfer and reduces the mass transfer in the system.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 135-155
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    AHP and TOPSIS based selection of aluminium alloy for automobile panels
    Autorzy:
    Swapna, D.
    Srinivasa Rao, Ch.
    Kumar, D. S.
    Radhika, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/95279.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    material selection
    MADM methods
    AHP
    TOPSIS
    aluminium alloys
    dobór materiałów
    metody MADM
    stopy aluminium
    Opis:
    Automotive industry is a very attractive area for young researchers to do continuous research and also it can be considered as an important thrust area as it is directly related to passenger safety. New developments in automotive sector can be seen in many domains like material selection, design, manufacturing etc. Since wrong selection directly leads to product failure, among these, the proper selection of a particular material can be treat as utmost priority. Hence, the present work discusses a methodology to select the best aluminium alloy for automobile panels among various alternates serving the same purpose. Analytical Hierarchy Process (AHP) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) methods with entropy weighting criteria are implemented for finding the best material and the results are discussed.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2019, 3, 1; 43-50
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Clinical and Radiological Outcome of Complex Proximal Tibia Fractures Managed with Hybrid/Ilizarov Fixator with or without Minimal Internal Fixation
    Autorzy:
    Hegde, Atmananda S.
    Madegowda, Arkesh
    Khanna, Vikrant
    Rao, Seetharam
    Powiązania:
    https://bibliotekanauki.pl/articles/28409353.pdf
    Data publikacji:
    2021-08-21
    Wydawca:
    Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
    Tematy:
    proximal tibia
    fractures
    hybrid fixator
    Opis:
    Background. Complex high grade proximal tibia fractures with associated extensive soft tissue injury pose a management challenge. The timing of surgery and fracture fixation options depend upon the extent of soft tissue damage. Post-operative complications such as wound breakdown, infection and infected non-union are common in such cases managed early with open reduction and internal fixation. Such fractures can be treated with primary closed reduction and Ilizarov/hybrid fixator application. Materials and methods. It is a retrospective cross sectional study conducted at two tertiary care multispecialty hospitals to report the mid-term clinical and radiological outcomes of complex high grade proximal tibia fractures. These injuries were managed by closed reduction and external fixation with/without minimal internal fixation as a definitive procedure and outcome measures were checked with serial radiographs and functional scores at a regular interval of follow up. 17 patients with Schatzker’s type 5 or 6 proximal tibia fractures with soft tissue compromise were operated on at two tertiary care referral centres from 2017 to 2019. These cases were operated on by two experienced trauma surgeons. Periodic follow-up was done and radiological and functional progression noted from case records. Results. Average time to union was noted to be 12.59 weeks and mean time of fixator removal was 21.4 weeks. At the end of 1 year of follow-up, average range of motion was 121.76 degrees, average WOMAC score was 74.81(63-82) and KOOS score was 78.24(63-85). Conclusions. 1. Hybrid/Ilizarov fixator method is a safe way of fixing high energy proximal tibia fractures. It is associated with a good functional outcome, less soft tissue complications and allows early weight bearing. 2. We recommend this method of treatment for complex high grade proximal tibia fractures.
    Źródło:
    Ortopedia Traumatologia Rehabilitacja; 2021, 23(4); 279-285
    1509-3492
    2084-4336
    Pojawia się w:
    Ortopedia Traumatologia Rehabilitacja
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A decentralized group signature scheme for privacy protection in a blockchain
    Autorzy:
    Devidas, S.
    Rao Y.V., Subba
    Rekha, N. Rukma
    Powiązania:
    https://bibliotekanauki.pl/articles/1838204.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    blockchain
    decentralization
    e-auction
    group signature
    privacy
    smart contract
    łańcuch bloków
    e-aukcja
    podpis grupy
    inteligentny kontrakt
    Opis:
    Group signature schemes play a vital role in protecting identity privacy of a member of a group who signs a message using the group signature. However, in the existing group signature schemes the centralized group manager has control over all the participants, and these managers can be malicious. They may take a biased decision when there is a dispute among the group members or while revealing the identity of a group member. To overcome the trust issues related to centralized group managers and to improve user privacy, a decentralized group signature scheme (DGSS) is proposed by decentralizing the role of the group manager. The proposed scheme will be more suitable for decentralized environments like a blockchain. Security analysis along with the proof of correctness is also provided for the proposed scheme. A framework for a blockchain-based e-auction protocol using the DGSS is also proposed in this paper.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2021, 31, 2; 353-364
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Rock Properties on Wear of M and SR Grade Rubber with Varying Normal Load and Sliding Speed
    Autorzy:
    Pal, S. K.
    Rao, K. U. M.
    Kumar, P. S.
    Rajasekar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/356996.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rock
    rubber
    wear
    shear strength
    surface roughness
    Opis:
    Rubbers are interesting materials and are extensively used in many mining industries for material transportation. Wear of rubber is a very complex phenomenon to understand. The present study aims to explain the influence of rock properties on wear of M and SR grade rubber used in top cover of conveyor belts. Extensive laboratory experiments were conducted under four combinations of normal load and sliding speed. The wear of both the rubber types were analyzed based on the rock properties like shear strength, abrasivity index and fractal dimension. A fully instrumented testing set up was used to study the wear of rubber samples under different operating conditions. In general, wear was higher for M grade rubber compared to SR grade rubber. Increase in shear strength of rocks depicts decreasing trend for the wear of M and SR grade rubber at lower load conditions. Moreover, a higher load combination displays no definite trend in both the rubbers. The strong correlation between the wear of rubber and frictional power for all rubber-rock combinations has given rise to the parameter A, which reflects the relative compatibility between the rubber and rock. Increase of Cerchar’s Abrasivity Index of rocks shows gradual enhancement in wear for M grade rubber in all the load and speed combinations whereas, it fails in SR grade rubber due to its higher strength. The wear of rubber tends to decrease marginally with the surface roughness of rocks at highest normal load and sliding speed in M grade rubber. However, the wear of M and SR grade rubber is influenced by the surface roughness of rocks.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1787-1793
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ethnobotanical study of traditional herbal plants used by local people of Seshachalam Biosphere Reserve in Eastern Ghats, India
    Autorzy:
    Reddy, A.M.
    Babu, M.V.S.
    Rao, R.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/71192.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    ethnobotany
    ethnomedicine
    traditional plant
    herbal plant
    species list
    drug development
    local people
    people
    Seshachalam Biosphere Reserve
    India
    Opis:
    Introduction: Ethnobotany is the study of medicinal plants used by local people, with particular importance of old-styled tribal beliefs and information. Ethnobotanical studies focus on ethnic knowledge of Adivasi people and development of data bases on ethnic knowledge but also focuses on preservation and regeneration of traditional beliefs and maintenance of traditional knowledge. Objective: The aim of present study is to highlight the traditional actions of herbal plants used by inborn Yanadi community of Seshachalam Biosphere Reserve, Eastern Ghats of Andhra Pradesh, India. Methods: The ethnobotanical field survey was conducted according to the methods adopted by some authors. In-depth interviews, interactions were conducted with tribal physicians of Yanadi, Nakkala and Irula as well as other tribes practicing and experiencing the use of plant-based medicine. A normal inquiry form was used to gather the appropriate data on herbal plants and their usage of inborn people’s lifestyle. Extensive consultations among local people and detailed documentation of the usage of plants were carried out in 2014–2017. The aged outmoded opinions and imposts of indigenous people conceded on by word of opening were documented. Results: A total of 266 medicinally used plant species belonging to 216 genera and 88 families were recognized with help of inborn herbal healers. The study also chronicled the mode of herbal arrangements, mode of the use of herbal plants in various disorders. The study exposed that native people of Seshachalam Biosphere Reserve have good medicinal information and also have preserved plant-based medicinal system of their ascendants used all their diseases. Most of medicinal plants are used in the treatment of indigestion, snake bite and skin diseases. The authors feel that this type of study certainly helps identify ethnic leads for drug development in future. Conclusions: The ethnobotanical investigation of Seshalam Biosphere area has revealed that the tribes possess good knowledge on plant-based medicine but as they are towards in advanced exposure to transformation, their information on traditional uses of plants is slowly getting eroded. The authors plead for intensive crosscultural studies involving all ethnic tribes in the country for prioritizing or short listing of ethnic leads for various disorders for ultimately developing global level drugs for human welfare and economy development.
    Źródło:
    Herba Polonica; 2019, 65, 1
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unsteady MHD heat transfer in Couette flow of water at 4°c in a rotating system with ramped temperature via finite element method
    Autorzy:
    Reddy, G. J.
    Raju, R. S.
    Rao, J. A.
    Gorla, R. S. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/265043.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    MHD
    Couette flow
    heat transfer
    FEM
    magnetohydrodynamika
    przepływ Couette'a
    transfer ciepła
    Opis:
    An unsteady magnetohydromagnetic natural convection on the Couette flow of electrically conducting water at 4°C (Pr = 11.40) in a rotating system has been considered. A Finite Element Method (FEM) was employed to find the numerical solutions of the dimensionless governing coupled boundary layer partial differential equations. The primary velocity, secondary velocity and temperature of water at 4°C as well as shear stresses and rate of heat transfer have been obtained for both ramped temperature and isothermal plates. The results are independent of the mesh (grid) size and the present numerical solutions through the Finite Element Method (FEM) are in good agreement with the existing analytical solutions by the Laplace Transform Technique (LTT). These are shown in tabular and graphical forms.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 1; 145-161
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High Performance DIF-FFT Using Dissimilar Partitioned LUT Based Distributed Arithmetic
    Autorzy:
    Cheepurupalli, Kusma Kumari
    Charan, Muntha
    Rao, Jammu Bhaskara
    Noor, Mahammad S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055270.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fast Fourier transform
    adders
    distributed arithmetic
    DSP
    Opis:
    Real-time data processing systems utilize Digital Signal Processing (DSP) functions as the base modules. Most of the DSP functions involve the implementation of Fast Fourier Transform (FFT) to convert the signals from one domain to another domain. The major bottleneck of Decimation in frequency - Fast Fourier Transform (DIF-FFT) implementation lies in using a number of Multipliers. Distributed arithmetic (DA) is considered as one of the efficient techniques to implement DIF-FFT. In this approach, the multipliers are not used. The proposed technique exploits the very advantage of the look-up table by storing the Twiddle factors, thereby avoiding the multipliers required in the butterfly structure. DIF-FFT using Distributed Arithmetic (DIF-FFT DA) models, with different adders such as Ripple carry adder (RCA), Carry-lookahead adder (CLA), and Sklansky prefix graph adder, are proposed in this paper. The three proposed models are synthesized using Cadence 6.1 EDA tools with a 45nm CMOS technology. Compared to the traditional method, it is observed that the area is improved by 53.11%, 53.35%, and 50.15%, power is improved by 42.31%, 42.52%, and 40.39%, and delay is improved by 45.26%, 45.42%, 41.80%, respectively.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 4; 631--637
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biodiesel production from Argemone mexicana seed oil using crystalline manganese carbonate
    Autorzy:
    Rao, R. Y.
    Zubaidha, P. K.
    Kondhare, D. D.
    Reddy, N.J.
    Deshmukh, S. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/778331.pdf
    Data publikacji:
    2012
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    biodiesel
    estry metylowe kwasów tłuszczowych
    olej z nasion Argemona meksykańskiegp
    krystaliczny węglan manganu
    kataliza wielofazowa
    fatty acid methyl esters
    argemone mexicana seed oil
    crystalline Manganese carbonate
    heterogeneous catalyst
    Opis:
    This communication explores the feasibility of biodiesel production from a weed plant Argemone mexicana seed oil and an efficient catalyst crystalline manganese carbonate. To the best of the authors' knowledge, this is the first study making use of pure, crystalline, ash colored manganese carbonate as a heterogeneous catalyst for the production of methyl esters as fuel from Argemone mexicana seed oil. The optimum process conditions for the conversion of Argemone mexicana oil to its methyl ester by transesterification required 1% manganese carbonate as catalyst with alcohol to oil ratio 5:1 at 60°C to yield biodiesel of 99.99% purity. The methyl esters obtained were examined by Gas chromatography analysis.
    Źródło:
    Polish Journal of Chemical Technology; 2012, 14, 1; 65-70
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of densities, viscosities and ultrasonic speeds of binary mixtures containing isopropyl alcohol and ketones at different temperatures
    Autorzy:
    Srinivas, S. S. J.
    Tulasi Koteswari Bai, B.
    Babu Rao, K.
    Narendra, K.
    Sarath Babu, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412144.pdf
    Data publikacji:
    2013
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    ultrasonic velocity
    density
    viscosity
    acoustic parameters
    Opis:
    The densities, viscosities and ultrasonic velocities of binary liquid mixtures of Isopropyl alcohol with acetophenone and methyl isobutyl ketone (MIBK) have been measured at temperatures 298.15 and 308.15 K over the entire range of mole fraction. From these data, acoustical parameters such as adiabatic compressibility (β), free volume (Vf) and free length (Lf) have been estimated using the standard relations. The results are interpreted in terms of molecular interactions present in the mixtures.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2013, 10, 2; 151-158
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emission Spectra of Triple Activated SrS Phosphors
    Autorzy:
    Rao, A. P.
    Sinha, O. P.
    Machwe, V. G.
    Mehta, A. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945381.pdf
    Data publikacji:
    1996-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.50.-j
    Opis:
    Fluorescence spectra of strontium sulphide phosphors activated by three activators viz. Mn, Cu, and Gd individually and in different combinations have been discussed at length. X-ray is used as excitation source. Probable inferences are drawn regarding energy transfer phenomenon. The two channels for transfer of energy are concluded in present phosphor series. A model is also proposed.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 4; 509-516
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on Creep Behavior of Composite Solid Propellants Using the Kelvin-Voigt Model
    Autorzy:
    Bihari, B. K.
    Rao, N. P. N.
    Gupta, M.
    Murthy, K. P. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/358395.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    mechanical properties
    viscoelasticity
    propellant
    creep
    DMA
    Opis:
    A Kelvin-Voigt model consisting of a spring and a dashpot in parallel was applied for the viscoelastic characterization of solid rocket propellants. Suitable values of spring constants and damping coefficients were employed by a least squares fit of the errors to generate creep curves using a Dynamic Mechanical Analyzer (DMA) for composite solid propellants. Three different composite propellant formulations based on HTPB/AP/Al having burning rates of 5 mm/s, 15 mm/s and 20 mm/s were tested under different stress levels varying from 0.1 MPa to 3 MPa and at different temperatures varying from 35 °C to 85 °C. Creep behavior with recovery was studied and analyzed to evaluate the viscoelastic properties. The change in spring constants, representing elastic deformation, was very small compared to the damping coefficients for the propellants studied. For a typical propellant formulation, when the stress level was increased, the spring and damping coefficient both increased significantly whereas for an increase in temperature, they remained nearly constant. However, the ratio E/η was observed to be constant and independent of stress level. It was also observed that the variation of E and η varied linearly with increase in stress whereas their ratio showed a logarithmic variation. A mathematical correlation was developed to evaluate the viscoelastic properties during creep of composite propellants.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 3; 742-756
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An investigation into the effect of rockmass properties on mean fragmentation
    Autorzy:
    Chandrahas, Sri
    Choudhary, Bhanwar Singh
    Prasad, N. S. R. Krishna
    Musunuri, Venkataramayya
    Rao, K. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073876.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    górotwór
    test wytrzymałości
    kopalnia węgla
    Opis:
    Desired rock fragmentation is the need of the hour, which influences the entire mining cycle. Thus, most engineering segments pay attention to rock fragmentation and neglect by-products like ground vibration and fly rock. Structural and mechanical properties of rock mass like joint spacing, joint angle, and compressive strength of rock pose a puzzling impact on both fragmentation and ground vibration. About 80% of explosive energy that gets wasted in producing ill effects can be positively optimised, with a new set of blast design parameters upon identifying the behaviour of rock mass properties. In this connection, this research aims to investigate the influence of joint spacing, joint angle, and compressive strength of rock on fragmentation and induced ground vibration. To accomplish this task, research was carried out at an opencast coal mine. It was discovered from this research that compressive strength, joint spacing, and joint angle have a significant effect on the mean fragmentation size (MFS) and peak particle velocity (PPV). With the increase in compressive strength, MFS explicit both increase and decrease trends whilst PPV increased with a specific increase in compressive strength of the rock. An increase in joint spacing triggers both increase and decrease trends in both MFS and PPV. While there is an increase in joint angle, MFS and PPV decrease.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 4; 561--578
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mucocele – A benign lesion of accessory salivary gland
    Autorzy:
    Chengappa, Dewan
    Vijayendranath, Nayak S.
    Raghavendra, Kini
    Prasanna, Kumar Rao J.
    Boricha, Vishal Kumar
    Manjunath, Rai
    Powiązania:
    https://bibliotekanauki.pl/articles/1157168.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Diagnosis
    excision
    lower lip
    minor salivary glands
    mucocele
    Opis:
    Mucoceles are the most common soft tissue lesions seen in the oral cavity. They usually occur due to injury to the minor salivary glands. Spontaneous regression of mucocele can happen if its superficial or else surgical excision is recommended. Herein we report a case of oral mucocele of lower labial mucosa.
    Źródło:
    World Scientific News; 2018, 94, 2; 305-307
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative performance with different versions of low heat rejection combustion chambers with crude rice bran oil
    Porównanie osiągów różnych wersji komór spalania o małych stratach ciepła przy wykorzystaniu surowego oleju roślinnego z otrąb ryżowych
    Autorzy:
    Murali, K. M. V. S.
    Rao, N. D. P.
    Prasad, B. A.
    Murthy, P. V. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/140033.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    alternate fuels
    vegetable oil
    biodiesel
    LHR engine
    fuel performance
    exhaust emissions
    combustion characteristics
    paliwa alternatywne
    olej roślinny
    silnik o małych stratach ciepła
    wydajność paliwa
    emisja spalin
    charakterystyka spalania
    Opis:
    It has been found that the vegetable oils are promising substitute, because of their properties are similar to those of diesel fuel and they are renewable and can be easily produced. However, drawbacks associated with crude vegetable oils are high viscosity, low volatility call for low heat rejection combustion chamber, with its significance characteristics of higher operating temperature, maximum heat release, and ability to handle lower calorific value (CV) fuel etc. Experiments were carried out to evaluate the performance of an engine consisting of different low heat rejection (LHR) combustion chambers such as ceramic coated cylinder head-LHR-1, air gap insulated piston with superni (an alloy of nickel) crown and air gap insulated liner with superni insert – LHR-2; and ceramic coated cylinder head, air gap insulated piston and air gap insulated liner – LHR-3 with normal temperature condition of crude rice bran oil (CRBO) with varied injector opening pressure. Performance parameters (brake thermal efficiency, brake specific energy consumption, exhaust gas temperature, coolant load, and volumetric efficiency) and exhaust emissions [smoke levels and oxides of nitrogen [NOx]] were determined at various values of brake mean effective pressure of the engine. Combustion characteristics [peak pressure, time of occurrence of peak pressure, maximum rate of pressure rise] were determined at full load operation of the engine. Conventional engine (CE) showed compatible performance and LHR combustion chambers showed improved performance at recommended injection timing of 27 degrees bTDC and recommend injector opening pressure of 190 bar with CRBO operation, when compared with CE with pure diesel operation. Peak brake thermal efficiency increased relatively by 7%, brake specific energy consumption at full load operation decreased relatively by 3.5%, smoke levels at full load decreased relatively by 11% and NOx levels increased relatively by 58% with LHR-3 combustion chamber with CRBO at an injector opening pressure of 190 bar when compared with pure diesel operation on CE.
    Jak wiadomo, oleje roślinne są obiecującym substytutem paliw ropopochodnych, ponieważ ich właściwości są podobne do oleju dieslowskiego, są odnawialne i łatwe do wyprodukowania. Niemniej, surowe oleje roślinne wykazują wady, takie jak wysoka lepkość i mała lotność, co wymaga komory spalania o małych stratach ciepła, której istotnymi cechami są m.in. wyższa temperatura robocza, maksymalne wydzielanie ciepła i zdolność do wykorzystania paliwa o mniejszej wartości kalorycznej (CV). Przeprowadzono eksperymenty mające na celu ocenę osiągów silnika z różnymi komorami spalania o małych stratach ciepła (LHR), takich jak głowica cylindra o pokryciu ceramicznym (LHR-1), tłok izolowany szczeliną powietrzną z denkiem ze stopu Superni (superstop niklu) i tuleją cylindra z wkładką z Superni izolowaną szczeliną powietrzną (LHR-2) oraz głowica cylindra z pokryciem ceramicznym, tłok i tuleja cylindra izolowane szczelinami powietrznymi (LHR-3). Badania prowadzono przy normalnej temperaturze oleju roślinnego (surowy olej z otrąb ryżowych, CRBO) i zmiennym ciśnieniu w otworze wtryskiwacza. Parametry osiagów silnika (użyteczna sprawność termiczna, użyteczny współczynnik zużycia energii, temperatura gazu wydychanego, obciążenie obiegiem chłodziwa i współczynnik napełnienia) oraz emisje wydechowe [poziomy dymu i tlenków azotu, NOx] zostały wyznaczone przy różnych wartościach średniego użytecznego ciśnienia w silniku. Charakterystyki spalania [ciśnienie szczytowe, czas występowania ciśnienia szczytowego, maksymalna szybkość wzrostu ciśnienia] zostały wyznaczone w warunkach pracy silnika z pełnym obciążeniem. W porównaniu z silnikiem napędzanym olejem diesla, silnik konwencjonalny (CE) wykazał podobne osiągi przy pracy z olejem roślinnym (CRBO), a w komorach spalania o małych stratach ciepła (LHR) uzyskano lepsze osiągi przy zalecanym kącie wtrysku 27b stopni TDC (przed górnym punktem zwrotnym) i zalecanym ciśnieniu w otworze wtryskiwacza równym 190 bar. Szczytowa użyteczna sprawność cieplna wzrosła relatywnie o 7%, użyteczny współczynnik zużycia energii zmalał o 3,5% przy pracy z pełnym obciążeniem, poziomy dymu przy pełnym obciążeniu zmalały o 11%, a poziom tlenków NOx wzrósł relatywnie o 58% w przypadku komory spalania typu LHR-3 napędzanej olejem roślinnym CBRO przy ciśnieniu w otworze wtryskiwacza 190 bar, w porównaniu z parametrami uzyskanymi przy pracy z czystym olejem diesla.
    Źródło:
    Archive of Mechanical Engineering; 2014, LXI, 4; 627-651
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of heat treatment on the mechanical performance of hot extruded Al6061-BN reinforced metal matrix composites
    Autorzy:
    Mukesh, Y. B.
    Naik, Prem Kumar
    R, Raghavendra Rao
    Vishwanatha, N. R.
    Prema, N. S.
    Girish, H. N.
    Laxmana, Naik L.
    Madhusudan, Puttaswamy
    Powiązania:
    https://bibliotekanauki.pl/articles/2086850.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al 6061
    metal matrix composites
    boron nitride
    heat treatment
    hot extrusion
    kompozyty z osnową metaliczną (MMC)
    azotek boru
    obróbka cieplna
    wytłaczanie na gorąco
    Opis:
    Boron nitride (BN) reinforced Al6061 aluminum-based composites are synthesized by conventional stir casting method followed by exposure to hot extrusion. The optical images confirmed the distribution of BN nanoparticles in the aluminum alloy matrix. The concentration of BN is varied from (0.5, 1.5, 3, 4.5, 6, 7.5, and 9 wt%) in the composites and its effect on the tensile strength was investigated. The results revealed that both extruded and heat-treated composites specimens showed enhanced toughness and tensile strength by increasing BN nanoparticle concentration. The heat-treated composite samples showed lower flexibility of up to 40%, and further, it exhibited 37% greater hardness and 32% enhancement in tensile strength over the extruded sample. The tensile properties of Al6061-BN composites were evaluated by temperature-dependent internal friction (TDIF) analysis and the results showed that the as-prepared composite's strength increased with temperature.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137014, 1--6
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of heat treatment on the mechanical performance of hot extruded Al6061-BN reinforced metal matrix composites
    Autorzy:
    Mukesh, Y.B.
    Naik, Prem Kumar
    R, Raghavendra Rao
    Vishwanatha, N.R.
    Prema, N.S.
    Girish, H.N.
    Laxmana, Naik L.
    Madhusudan, Puttaswamy
    Powiązania:
    https://bibliotekanauki.pl/articles/2128169.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al 6061
    metal matrix composites
    boron nitride
    heat treatment
    hot extrusion
    kompozyty z osnową metaliczną (MMC)
    azotek boru
    obróbka cieplna
    wytłaczanie na gorąco
    Opis:
    Boron nitride (BN) reinforced Al6061 aluminum-based composites are synthesized by conventional stir casting method followed by exposure to hot extrusion. The optical images confirmed the distribution of BN nanoparticles in the aluminum alloy matrix. The concentration of BN is varied from (0.5, 1.5, 3, 4.5, 6, 7.5, and 9 wt%) in the composites and its effect on the tensile strength was investigated. The results revealed that both extruded and heat-treated composites specimens showed enhanced toughness and tensile strength by increasing BN nanoparticle concentration. The heat-treated composite samples showed lower flexibility of up to 40%, and further, it exhibited 37% greater hardness and 32% enhancement in tensile strength over the extruded sample. The tensile properties of Al6061-BN composites were evaluated by temperature-dependent internal friction (TDIF) analysis and the results showed that the as-prepared composite's strength increased with temperature.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137014, 1--6
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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