Autor: Kumar, A. K. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Transient finite element simulation and microstructure evolution of AA2219 weld joint using gas tungsten arc welding process
Autorzy:: Arunkumar, S.
Shrikrishna, A. K.
Paulraj, S.
Devakumaran, K.
Kumar, S. R.
Powiązania:: https://bibliotekanauki.pl/articles/101882.pdf
Data publikacji:: 2016
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: AA2219 aluminium alloy
gas tungsten arc welding
finite element simulation
metallurgical characterization
Opis:: In this study we focus on finite element simulation of gas tungsten arc welding (GTAW) of AA2219 aluminum alloy and the behavioral of the microstructure before and after weld. The simulations were performed using commercial COMSOL Multiphysics software. The thermal history of the weld region was studied by initially developed mathematical model. A sweep type meshing was used and transient analysis was performed for one welding cycle. The highest temperature noted was 3568 °C during welding. The welding operation was performed on 200×100×25 mm plates. Through metallurgical characterization, it was observed that a fair copper rich cellular (CRC) network existed in the weld region. A small amount of intermetallic compounds like Al2Cu is observed through the XRD pattern.
Źródło:: Advances in Science and Technology. Research Journal; 2016, 10, 31; 64-73
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Utilization of services and referrals through dental outreach programs in rural areas of India. A two year study
Autorzy:: Asawa, K.
Bhanushali, N.V.
Tak, M.
Kumar, D.R.V.
Rahim, M.F.B.A.
Alshahran, O.A.
Divakar, D.D.
Powiązania:: https://bibliotekanauki.pl/articles/877920.pdf
Data publikacji:: 2015
Wydawca:: Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:: motivation
utilization
service
referral
dental outreach programme
rural area
rural population
India
Opis:: Background. Oral health care services are often sparse and inconsistent in India therefore it is often difficult for poor people to get access to the oral health care services. The approach by dental institutions with the help of community outreach programs is a step ahead in overcoming this situation. Objectives. The study was conducted to evaluate the number of patients, disease pattern and the services provided in the outreach programmes and also effectiveness of patient referral. Methods. A retrospective study was conducted and the data were obtained from records of outreach programs conducted, in last 2 years by Pacific Dental College and Hospital. The data were analysed using descriptive statistics for the computation of percentages Chi-square test was applied to know the association of effectiveness of referral with age and gender. Confidence level and level of significance was fixed at 95% and 5% respectively. Results. A total of 22982 individuals in the age group of 4-80 years attended the outreach program. Dental caries (42.3%), periodontal diseases (63.2-69.0%) and dental fluorosis (33.7-35.0%) were commonly observed diseases. Effectiveness of referral was significantly high among the middle age adults and females (P<0.05). The effectiveness of referral was highly improved in 2013 after establishment of certain guidelines and strategies. Conclusion. The approaches by dental institutions with the help of community outreach programs can spread awareness and disseminate treatment and thereby enhancing access to care and eliminating access to care within the rural communities.
Źródło:: Roczniki Państwowego Zakładu Higieny; 2015, 66, 3
0035-7715
Pojawia się w:: Roczniki Państwowego Zakładu Higieny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Protuberance-mediated high frequency of adventitious shoot regeneration from sweetpotato leaf explants [Ipomoea batatas (L.) Lam.]
Autorzy:: Ashok Kumar, H.G.
Ku, A.T.
Agrawal, P.
Mahesh, S.
Yeh, K.-W.
Powiązania:: https://bibliotekanauki.pl/articles/80764.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: adventitious shoot
organogenesis
sweet potato
Ipomoea batatas
plant regeneration
leaf explant
Źródło:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 4
0860-7796
Pojawia się w:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Status and Scope of the Jute Industry in India in Comparison to other World Producers
Analiza produkcji włókien z juty i wyrobów jutowych w Indiach w porównaniu do innych producentów światowych
Autorzy:: Bag, S. N.
Kumar, U. C.
Pal, A. K.
Powiązania:: https://bibliotekanauki.pl/articles/234020.pdf
Data publikacji:: 2016
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:: twill
bags
hessian
jute goods
sacking
diagonal
torby
włókno jutowe
wyroby z juty
worki jutowe
Opis:: India is the leading producer of raw jute and jute products in the world. India’s sacking goods production comprises 75% of the total goods production and B twill bags, used for packaging rice and wheat, and contributes 85% of the total sacking bag production. Still there exists an increasing trend of imports of jute products due to the increase in the domestic consumption of conventional jute goods. Bangladesh is the major exporter in jute goods, with India in 2nd position. Hessian cloth and bags are the major exporting items of jute goods from India. In the overall situation, there exists a unique opportunity of the jute industry to improve the social and economic conditions of the states concerned as well as the country. Being the preferred sector in raw jute production due to suitable topographical conditions, emphasis now needs to be placed on modernization of the jute sector with a view to developing a viable and efficient jute manufacturing sector in the country.
Indie są wiodącym producentem włókien jutowych i produktów z juty. Indie produkują 75%-85% światowej produkcji worków opakunkowych. Istnieje wzrastający trend zużycia worków jutowych w związku ze zwiększającym się zapotrzebowaniem krajowym. Drugie miejsce w produkcji wyrobów jutowych zajmuje Bangladesz. Istnieją korzystne warunki do dalszej poprawy rozwoju przemysłu juty, w tym zwiększenie modernizacji i wydajności przemysłu.
Źródło:: Fibres & Textiles in Eastern Europe; 2016, 6 (120); 19-25
1230-3666
2300-7354
Pojawia się w:: Fibres & Textiles in Eastern Europe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Selected physico-mechanical characteristics of cryogenic and ambient ground turmeric
Autorzy:: Barnwal, P.
Mohite, A.M.
Singh, K.K.
Kumar, P.
Powiązania:: https://bibliotekanauki.pl/articles/25528.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: physical characteristics
mechanical characteristics
cryogenic grinding
ambient grinding
turmeric
Curcuma longa
packaging
handling
storage
Opis:: In this communication, selected physicomechanical characteristics of ground turmeric (cv. Prabha) were investigated for cryogenic and ambient grinding conditions of turmeric at different moisture contents (4, 6, 8 and 10% w.b.). A cryogenic grinder (Model: 100 UPZ, Hosokawa Alpine, Germany) and a micro pulverizer (hammer mill) were used for cryogenic and ambient grinding, respectively. The ground turmeric was graded in three grades viz. Gr-I, Gr-II and Gr-III with a sieve shaker using BSS Nos. 40, 85 and pan, respectively. Tap densities for cryogenic and ambient ground turmeric decreased from 678.7 (Gr-I) to 546.7 kgm-3 (Gr-III) and from 642.3 (Gr-I) to 468.6 kgm-3 (Gr-III), respectively, with the moisture increase. The angle of repose for cryogenic and ambient ground turmeric increased linearly from 26.85 (Gr-I) to 34.0° (Gr-III) and from 23.10 (Gr-I) to 28.06° (Gr-III), respectively with the increase in moisture content. The static coefficient of friction was the highest on plywood surface followed by mild steel sheet and galvanized iron sheet. The cryoground samples were found better in colour. Thermal conductivity of cryo-ground samples was higher than that of ambient ground samples. These physico-mechanical characteristics of cryogenic and ambient ground turmeric will be helpful for packaging, handling, and storage.
Źródło:: International Agrophysics; 2014, 28, 1
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Parametric studies and simulation of PSA process for oxygen production from air
Autorzy:: Beeyani, A.
Singh, K.
Vyas, R.
Kumar, S.
Powiązania:: https://bibliotekanauki.pl/articles/779567.pdf
Data publikacji:: 2010
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: amplituda ciśnienia adsorpcji
model matematyczny
symulacja
produkcji tlenu
MATLAB
Zeolit5A
pressure swing adsorption
mathematical model
simulation
oxygen production
Zeolite 5A
Opis:: A numerical simulation and parametric studies for the separation of air using 5A zeolite for the production of oxygen are presented for a basic two bed pressure swing adsorption (PSA) process. The simulation is based on an in-house program 'PSASOL' developed in MATLABŽ. The transient process of PSA has been described by a set of partial differential equations, which were solved using a finite difference method. Simulation results have been validated with the experimental data from literature. Based on the simulation results, an optimal set of operational parameter values has been obtained for the PSA bed. The values of the optimal parameters, viz. adsorption pressure, cycle time, feed rate, and product rate have been found to be 2.5 atm, 150 s, 15 cm3/s, and 2.55 cm3/s, respectively. For the optimal conditions, purity of 95.45% and recovery of 77.3% have been achieved. It has also been found that a longer tubular unit with the length to diameter (L/D) ratio of 10.5 is advantageous. The estimated pressure drop across the bed has been found to be negligible. Power consumption and productivity have also been computed.
Źródło:: Polish Journal of Chemical Technology; 2010, 12, 2; 18-28
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Thermal modelling, simulation and experimental validation of heat accumulation in a framed glass cabin
Autorzy:: Bera, T. K.
Dixit, S.
Bhattacharya, A.
Kumar, D.
Samantaray, A. K.
Powiązania:: https://bibliotekanauki.pl/articles/280907.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: car cabin
experimental thermal analysis
bond graph modelling
double layer glass window
Opis:: The present work concerns prediction of the amount of heat accumulation within the interior of a framed glass cabin and proposes some remedial measures to reduce temperature in the cabin. Various configurations such as double layer glass box filled with static air, static argon gas and flowing argon gas within the space between the two glass-layers are considered to conduct the experiments. Multi-physics bond graph models for these configurations are developed considering thermo-fluidic aspects. The experimental results are compared with the simulations using bond graph models. Though, direct application to a vehicle is not made, without loss of generality, the modelling and experimental procedure can be extended to analyze the heat accumulation inside a vehicle cabin when the vehicle is parked under direct sunlight.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 911-922
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Optimization of heat transfer properties of nanofluid flow over a shrinking surface through mathematical modeling
Autorzy:: Bhandari, A.
Pavan Kumar Pannala, R. K.
Powiązania:: https://bibliotekanauki.pl/articles/265571.pdf
Data publikacji:: 2020
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: magnetohydrodynamika
nanofluid
przepływ
ciepło
magnetohydrodynamics
velocity
3D flow
thermal and heat absorption effects
shrinking surface
Opis:: In the current study, a three dimensional incompressible magnetohydrodynamic (MHD) nanofluid flow over a shrinking surface with associated thermal buoyancy, thermal radiation, and heating absorption effects, as well as viscous dissipation have been investigated. The model has been represented in a set of partial differential equations and is transformed using suitable similarity transformations which are then solved by using the finite element method through COMSOL. The results for velocity and temperature profiles are provided for various values of the shrinking parameter, Biot’s number, heat generation/absorption parameter, thermal Grashof number, nanoparticle volume fraction, permeability parameter, magnetic parameter and radiation parameter.
Źródło:: International Journal of Applied Mechanics and Engineering; 2020, 25, 2; 40-56
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Modelling and structural analysis of skull/cranial implant: beyond mid-line deformities
Autorzy:: Bogu, V. P.
Kumar, Y. R.
Khanara, A. K.
Powiązania:: https://bibliotekanauki.pl/articles/307070.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: ciśnienie wewnątrzczaszkowe
FEM
implant
intracranial pressure
finite element analysis
beyond mid-line defect
fixation points
Opis:: Purpose: This computational study explores modelling and finite element study of the implant under Intracranial pressure (ICP) conditions with normal ICP range (7 mm Hg to 15 mm Hg) or increased ICP (>I5 mm Hg). The implant fixation points allow implant behaviour with respect to intracranial pressure conditions. However, increased fixation points lead to variation in deformation and equivalent stress. Finite element analysis is providing a valuable insight to know the deformation and equivalent stress. Methods: The patient CT data (Computed Tomography) is processed in Mimics software to get the mesh model. The implant is modelled by using modified reverse engineering technique with the help of Rhinoceros software. This modelling method is applicable for all types of defects including those beyond the middle line and multiple ones. It is designed with eight fixation points and ten fixation points to fix an implant. Consequently, the mechanical deformation and equivalent stress (von Mises) are calculated in ANSYS 15 software with distinctive material properties such as Titanium alloy (Ti6Al4V), Polymethyl methacrylate (PMMA) and polyether-ether-ketone (PEEK). Results: The deformation and equivalent stress results are obtained through ANSYS 15 software. It is observed that Ti6Al4V material shows low deformation and PEEK material shows less equivalent stress. Among all materials PEEK shows noticeably good result. Conclusions: Hence, a concept was established and more clinically relevant results can be expected with implementation of realistic 3D printed model in the future. This will allow physicians to gain knowledge and decrease surgery time with proper planning.
Źródło:: Acta of Bioengineering and Biomechanics; 2017, 19, 1; 125-131
1509-409X
2450-6303
Pojawia się w:: Acta of Bioengineering and Biomechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The dynamics of a parametrically driven damped pendulum
Autorzy:: Das, A.
Kumar, K.
Powiązania:: https://bibliotekanauki.pl/articles/265555.pdf
Data publikacji:: 2015
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: parametric vibration
Floquet analysis
Lyapunov exponents
stroboscopic maps
chaos
teoria Floqueta
funkcja Lapunowa
Opis:: Ordered and chaotic states of a parametrically driven planar pendulum with viscous damping are numerically investigated. The damping makes the number of chaotic windows fewer but with larger width. Stroboscopic maps of the chaotic motion of the pendulum, driven either subharmonically or harmonically, show strange attractors with inversion symmetry in the phase plane.
Źródło:: International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 257-266
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Early Eocene frogs from Vastan Lignite Mine, Gujarat, India
Autorzy:: Folie, A.
Rana, R.S.
Rose, K.D.
Sahni, A.
Kumar, K.
Singh, L.
Smith, T.
Powiązania:: https://bibliotekanauki.pl/articles/20353.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Amphibia
Bombinatoridae
Ranidae
Pelobatidae
Rhacophoridae
Eocene
Early Eocene
frog
Vastan Lignite Mine
Gujarat
India
Opis:: The Ypresian Cambay Shale Formation of Vastan Lignite Mine in Gujarat, western India, has yielded a rich vertebrate fauna, including the earliest modern mammals of the Indian subcontinent. Here we describe its assemblage of four frogs, including two new genera and species, based on numerous, diverse and well−preserved ilia and vertebrae. An abundant frog, Eobarbourula delfinoi gen. and sp. nov., with a particular vertebral articulation similar to a zygosphene−zygantrum complex, represents the oldest record of the Bombinatoridae and might have been capable of displaying the Unken reflex. The large non−fossorial pelobatid Eopelobates, known from complete skeletons from the Eocene and Oligocene of Europe, is also identified at Vastan based on a single nearly complete ilium. An abundant “ranid” and a possible rhacophorid Indorana prasadi gen. and sp. nov. represent the earliest records of both families. The Vastan pelobatids and ranids confirm an early worldwide distribution of these families, and the bombinatorids and rhacophorids show possible origins of those clades on the Indian subcontinent.
Źródło:: Acta Palaeontologica Polonica; 2013, 58, 3
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Studies on Aluminized, High Burning Rate, Butacene® Based, Composite Propellants
Autorzy:: Ghosh, K.
Behera, S.
Kumar, A.
Padale, B. G.
Deshpande, D. G.
Gupta, M.
Powiązania:: https://bibliotekanauki.pl/articles/358702.pdf
Data publikacji:: 2014
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:: Butacene®
ferrocene
pressure exponent
Opis:: This paper reports on a Butacene® based composite propellant with high burning rate. The effect of replacing HTPB with Butacene® on the physical, mechanical and ballistic properties, and sensitivity towards impact and friction, has been studied. The ballistic properties were evaluated as burning rates at various pressures (7-11 MPa), pressure exponents, ignition temperatures etc. As expected, a remarkable enhancement in burning rate at low pressures was observed with increasing percentage of Butacene®. Comparatively lower n-values were observed for compositions containing Butacene® than for HTPB based propellants. The sensitivity of Butacene® based compositions, in terms of impact and friction, was found to be increased with an increasing percentage of Butacene®.
Źródło:: Central European Journal of Energetic Materials; 2014, 11, 3; 323-333
1733-7178
Pojawia się w:: Central European Journal of Energetic Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Vibration of non-homogeneous visco-elastic circular plate of linearly varying thickness in steady state temperature field
Drgania niejednorodnej lepko-sprężystej płyty kołowej o liniowo zmiennej grubości i ustalonym polu temperatury
Autorzy:: Gupta, A. K.
Kumar, L.
Powiązania:: https://bibliotekanauki.pl/articles/280105.pdf
Data publikacji:: 2010
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: non-homogeneous
visco-elastic
variable thickness
steady state temperature field
Opis:: An analysis is presented for free vibration of a non-homogeneous visco-elastic circular plate with linearly varying thickness in the radial direction subjected to a linear temperature distribution in that direction. The governing differential equation of motion for free vibration is obtained by the method of separation of variables. Rayleigh-Ritz's method has been applied. Deflection, time period and logarithmic decrement corresponding to the first two modes of vibrations of a clamped non-homogeneous visco-elastic circular plate for various values of non-homogeneity parameter, taper constant and thermal gradients are obtained and shown graphically for the Voigt-Kelvin model.
W pracy przedstawiono analizę drgań swobodnych niejednorodnej lepko- sprężystej płyty kołowej o liniowo zmiennej grubości w kierunku promieniowym i poddanej polu temperatury o liniowym rozkładzie w tym kierunku. Konstytutywne równanie różniczkowe ruchu dla drgań swobodnych otrzymano poprzez separację zmiennych. Zastosowano metodę Rayleigha-Ritza. W wyniku analizy wyznaczono ugięcie płyty, okres drgań i logarytmiczny dekrement tłumienia dwóch pierwszych postaci drgań dla warunków brzegowych odpowiadających zamocowaniu niejednorodnej płyty na brzegu. Wyniki przedstawiono graficznie w funkcji parametru niejednorodności, stałej zawężania grubości oraz zmiennego gradientu temperatury przy wykorzystaniu modelu reologicznego Kelvina-Voigta opisującego właściwości materiału płyty.
Źródło:: Journal of Theoretical and Applied Mechanics; 2010, 48, 1; 255-266
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: The effect of fiber length on tensile properties of polyester resin composites reinforced by the fibers of Sansevieria trifasciata
Autorzy:: Hari Sankar, P.
Hemacahndra Reddy, K.
Mohana Reddy, Y.V.
Ashok Kumar, M.
Ramesh, A.
Powiązania:: https://bibliotekanauki.pl/articles/11876.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: fibre length
tensile property
polyester composite
resin
fibre
Sansevieria trifasciata
polyester
mechanical property
Opis:: This paper presents the study of the tensile properties of Sansevieria trifasciata – fiber (here after called STF) reinforced polyester composites. The composite sample was fabricated with five different fiber lengths of STF (2, 4, 6, 8 and 10 mm). The fabrication was made by hand lay-up technique. Mechanical properties were determined using tensile testing. An interact between fiber and matrix was observed from the SEM (scanning electron microscope) micrographs. The study reveals that the tensile strength increased with fiber length without effecting the elongation at break of the composite.
Źródło:: International Letters of Natural Sciences; 2014, 03
2300-9675
Pojawia się w:: International Letters of Natural Sciences
Dostawca treści:: Biblioteka Nauki