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    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:
    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:
    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
    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:
    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:
    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:
    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:
    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
      Wyświetlanie 1-10 z 10

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