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Search Results: 1 - 10 of 191961 matches for " D. Acharya "
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H?gbomite Associated with Vanadium bearing Titaniferous Magnetite of Mafic-Ultramafic Suite of Moulabhanj Igneous Complex, Orissa, India  [PDF]
D. Beura, D. Acharya, P. Singh, S. Acharya
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.89064
Abstract: H?gbomite associated with vanadium bearing titaniferous magnetite has been identified in mafic-ultramafic suite of rocks of Moulabhanj, Orissa, India. The igneous complex intruded into granulite terrain of Eastern Ghat Super Group. The iron mineral assemblages are Ti-V magnetite, martite and ilmenite. H?gbomite occurs in association with Ti-V magnetite and exhibits both primary and secondary micro-textures. EPMA study confirms the presence of h?gbomite.
A Review of Independent Component Analysis Techniques and their Applications
Acharya D,Panda G
IETE Technical Review , 2008,
Abstract: Independent Component Analysis, a computationally efficient blind statistical signal processing technique, has been an area of interest for researchers for many practical applications in various fields of science and engineering. The present paper attempts to treat the fundamental concepts involved in the independent component analysis (ICA) technique and reviews different ICA algorithms. A thorough discussion of the algorithms with their merits and weaknesses has been carried out. Applications of the ICA algorithms in different fields of science and technology have been reviewed. The limitations and ambiguities of the ICA techniques developed so far have also been outlined. Though several articles have reviewed the ICA techniques in literature, they suffer from the limitation of not being comprehensive to a first time reader or not incorporating the latest available algorithm and their applications. In this work, we present different ICA algorithms from their basics to their potential applications to serve as a comprehensive single source for an inquisitive researcher to carry out his work in this field.
Effect of Metabolic Reactions on Thermoregulation in Human Males and Females Body  [PDF]
Saraswati Acharya, D. B. Gurung, V. P. Saxena
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.45A005

The paper describes the study of metabolic effect relying on dermal thicknesses of males and females for temperature distribution of the layers of dermal part at various atmospheric temperatures. The study has been carried out for one dimensional steady and unsteady cases using finite element method. Lower percentage of muscle mass and higher percentage of adipose tissue in subcutaneous part of females result lower metabolic rate compared to males. Metabolism is considered as a heat source within the body tissue. The appropriate physical and physiological parameters together with suitable boundary conditions that affect the heat regulations have been incorporated in the model.

Effect of stacking sequence on the erosive wear behavior of jute and juteglass fabric reinforced epoxy composite
BC Patel, SK Acharya, D Mishra
International Journal of Engineering, Science and Technology , 2011,
Abstract: In this present work the effect of stacking sequence on erosive wear behavior of untreated woven jute and glass fabric reinforced epoxy hybrid composites has been investigated experimentally. Composite Laminates were fabricated by hand lay-up technique in a mold and cured under light pressure for one hour, followed by curing at room temperature for forty eight hours. All the laminates were made with a total of 4 plies, by varying the number and position of glass layers so as to obtain six different stacking sequences. One group of only jute laminate was also fabricated for comparison purpose. The erosion rates of these composites have been evaluated at different impingement angles (30-900) and at three different particle speeds (v=48, 70, 82m/s).The erodent used is silica sand with the size range 150-250 ìm of irregular shapes.The impingement angle was found to have a significant influence on the erosion rate. The composite material showed semi ductile behaviour with maximum erosion at 450 impingement angle. The morphology of the eroded surface was examined by SEM.It is conclude from the study that the erosive wear behavior of natural fiber jute can be improved significantly by hybridizing with synthetic fiber glass.
Environmental effect of water absorption and flexural strength of red mud filled jute fiber/polymer composite
BC Patel, SK Acharya, D Mishra
International Journal of Engineering, Science and Technology , 2012,
Abstract: Natural fibers are considered as a good reinforcement in composite material because of their good mechanical properties and low density. However the main drawback of these fibers is moisture absorption in their outdoor applications. The present investigation is aimed at processing a composite using jute fiber and epoxy resin as matrix and red mud as a filler material. The degradation of the composite mechanical properties such as flexural strength has been studied when it is subjected to different environmental conditions. To increase the adhesion between fiber and matrix material and to increase the moisture resistance chemical surface treatment has been performed on the fibers. The composites flexural strength and moisture resistance with modified fibers have also been investigated. It was found that chemical modification of fibers reduced the overall water uptake of the jute fibers. The flexural strength of the composite with modified fibers increases significantly compared to untreated fibers.
Role of matrix metalloproteinases in the pathophysiology of idiopathic pulmonary fibrosis
Bhattacharyya P,Acharya D,Roychowdhury S
Lung India , 2007,
Abstract: Idiopathic pulmonary fibrosis (IPF), a progressive fibrosing lung condition is a ther-apeutic medical challenge. The etiopathogenesis of IPF is complicated and hitherto not adequately understood. However, the concept, of late, is shifting from fibrosis as a result of inflammation to a mechanism of primarily dysregulated fibrogenesis. A class of enzymes called matrix metallo proteinases (MMPs) appear important in the pathogenesis of IPF. The heightened activity of MMPs are derived out of an imbalance between them (MMPs) and their tissue inhibitors (TIMPs). This leads to breakdown of interstitial matrix and triggering of certain growth factors which play an important mechanistic role in the pathogenesis of IPF. Understanding of the role of MMPs in pathogenesis of IPF may open up a new horizon of therapeutic intervention of the desease.
Three-dimensional CT angiography in the evaluation of cerebral arteries in acute hemorrhage
Rajagopal K,Lakhkar B,Acharya D
Neurology India , 2003,
Abstract: Objective: We conducted this study to demonstrate the value of non-invasive three-dimensional CT angiography (3D CTA) in the detection of a cerebral aneurysm. Material and Methods: A helical CT acquisition was obtained using non-ionic contrast media in 50 patients with 1 mm per second table speed, 1 mm collimation, and pitch 1:1. Axial source images were transferred into a workstation console (Advantage windows GE) and CTA was obtained using MIP (Maximum Intensity Projection) reconstruction. Fourteen patients underwent conventional digital subtraction angiography (DSA) after 3D CTA prior to surgery. Results: A total of 39 aneurysms were detected in 50 patients. All patients with an aneurysm were operated and the presence of aneurysms was confirmed. 3D CTA detected 38 of these 39 aneurysms. In 37 aneurysms, the origin of the aneurysm and aneurysm neck was adequately visualized. 3D CTA was found to be 100% specific and 97.2% sensitive in picking up cerebral aneurysms. 3D CTA was 97% specific in demonstrating the exact origin and showing the neck of the aneurysm. Conclusions: CT angiography is a simple, quick, and non-invasive technique and can replace DSA in most patients with acute subarachnoid hemorrhage aneurysm for the detection and characterization of aneurysms of the circle of Willis. The relation of the aneurysm with bony landmarks was clearly depicted.
Zenica D'souza,Shrinivasa G Acharya
Journal of Ayurveda and Holistic Medicine , 2013,
Abstract: Background: As age advances vata dosha increases in an individual. This increasing vata triggers and accelerates dhatu kshaya (depletion of tissues) and bala kshaya (reduction of strength). Hence advancing age makes man prone to many diseases including degenerative disorders. Sandhigata vata manifests when the deranged vata lodges in joints. If the condition manifest in the janu sandhi (knee joint), it is called as janu sandhigata vata (knee osteoarthritis). Local pain and functional disability of the effected joint are the major manifestations of knee osteoarthritis. Shallaki niryasa, an oleoresin available from the plant Boswelia serreta is known for its anti inflammatory and analgesic property. In this study a clinical trial using oleoresin available from shallaki is done on participants suffering from knee osteoarthritis. Objective: To evaluate the effect of shallaki in knee osteoarthritis. Method: The clinical study was carried out for a period of 4 weeks where alcoholic extract of shallaki 400mg was given orally with water thrice daily after food. Concurrent analgesics/NSAIDs and steroids in any form were not permitted. Lifestyle and /or dietary restrictions were not imposed during the course of the study. Results: The primary efficacy variables were pain in knee joints, modified WOMAC, joint crepitus and swelling in knees. Paired‘t’ test was used for within group comparison. Pain and WOMAC showed significant improvement (P<0.001) after treatment. Swelling in knees was absent after the treatment in 80% of volunteers who presented with the manifestation. Joint crepitus remained unchanged after completion of treatment in all individuals.Conclusion: shallaki is effective and safe in the symptomatic treatment of knee osteoarthritis.
Bhat Savitha D,BK Ashok,Acharya Rabinarayan
International Journal of Research in Ayurveda and Pharmacy , 2012,
Abstract: Ayurveda advocates Shodhana (Purificatory procedures) for poisonous substances to render it safe and effective for therapeutics. But mentioning of Shodhana for a non poisonous plant like Vacha is a matter of great curiosity with regards to the purpose of Shodhana. In this review an attempt has been made to analyse the concept and relevance of Vacha Shodhana in view of both classical and modern thoughts.
Implications of a matter-radius measurement for the structure of Carbon-22
B. Acharya,C. Ji,D. R. Phillips
Physics , 2013, DOI: 10.1016/j.physletb.2013.04.055
Abstract: We study Borromean 2n-halo nuclei using effective field theory. We compute the universal scaling function that relates the mean-square matter radius of the 2n halo to dimensionless ratios of two- and three-body energies. We use the experimental value of the rms matter radius of 22C measured by Tanaka et al. to put constraints on its 2n separation energy and the 20C-n virtual energy. We also explore the consequences of these constraints for the existence of excited Efimov states in this nucleus. We find that, for 22C to have an rms matter radius within 1-sigma of the experimental value, the two-neutron separation energy of 22C needs to be below 100 keV. Consequently, this three-body halo system can have an excited Efimov state only if the 20C-n system has a resonance within 1 keV of the scattering threshold.
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