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Search Results: 1 - 10 of 1585 matches for " Raju Bangalore Singe Gowda "
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Studies on the Process Parameters of Rapid Prototyping Technique (Stereolithography) for the Betterment of Part Quality
Raju Bangalore Singe Gowda,Chandra Sekhar Udayagiri,Drakshayani Doulat Narendra
International Journal of Manufacturing Engineering , 2014, DOI: 10.1155/2014/804705
Abstract: Rapid prototyping (RP) has evolved as frontier technology in the recent times, which allows direct transformation of CAD files into functional prototypes where it tremendously reduces the lead time to produce physical prototypes necessary for design verification, fit, and functional analysis by generating the prototypes directly from the CAD data. Part quality in the rapid prototyping process is a function of build parameters such as hatch cure depth, layer thickness, orientation, and hatch spacing. Thus an attempt was made to identify, study, and optimize the process parameters governing the system which are related to part characteristics using Taguchi experimental design techniques quality. The part characteristics can be divided into physical part and mechanical part characteristics. The physical characteristics are surface finish, dimensional accuracy, distortion, layer thickness, hatch cure, and hatch file, whereas mechanical characteristics are flexural strength, ultimate tensile strength, and impact strength. Thus, this paper proposes to characterize the influence of the physical build parameters over the part quality. An L9 orthogonal array was designed with the minimum number of experimental runs with desired parameter settings and also by analysis tools such as ANOVA (analysis of variance). Establishment of experimentally verified correlations between the physical part characteristics and mechanical part characteristics to obtain an optimal process parameter level for betterment of part quality is obtained. The process model obtained by the empirical relation can be used to determine the strength of the prototype for the given set of parameters that shows the dependency of strength, which are essential for designers and RP machine users. 1. Introduction Due to the advances in electronics and computers, there has been a significant growth in communication, information technology, and worldwide networking, which leads to globalization and opening of markets [1, 2]. Thus in product development, rapid prototyping (RP) and rapid product development have turned out to be the key instruments to save time and money with respect to the development of innovative products [2, 3]. Stereolithography (SLA) is one of the RP techniques, which involve fabrication of intricate shape of a plastic monomer directly from computer aided design (CAD) data by depositing material layer by layer by photopolymerization process [4]. The SLA process involves the following steps: conversion of the CAD model to the standard triangulation language (STL) file format; slicing
Investigations on Mechanical and Tribological Behaviour of Particulate Filled Glass Fabric Reinforced Epoxy Composites  [PDF]
Bhadrabasol Revappa Raju, Bheemappa Suresha, Ragera Parameshwarappa Swamy, Bannangadi Swamy Gowda Kanthraju
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2013, DOI: 10.4236/jmmce.2013.14027
Abstract: The aim of the research article is to study the mechanical and two-body abrasive wear behaviour of alumina (Al2O3) filled glass fabric reinforced epoxy (G-E) composites. Alumina filled G-E composites containing 0, 5, 7.5 and 10 wt% were prepared using the hand lay-up technique followed by compression molding. The mechanical properties such as tensile strength, hardness and tensile modulus were investigated in accordance with ASTM standards. Two-body abrasive wear studies were carried out using a pin-on-disc wear tester under multi-pass condition against the water proof silicon carbide abrasive paper. From the experimental investigation, it was found that the presence of Al2O3 filler improved the tensile strength and tensile modulus of the G-E composite. Inclusion of Al2O3 filler reduced the specific wear rate of G-E composite. The results show that in abrasion mode, as the filler loading increases the wear volume decreases and increased with increasing abrading distance. The excellent wear resistance was obtained for Al2O3 filled G-E composites. Furthermore, 10 wt% filler loading gave a very less wear loss. Finally, the scanning electron microscopic observations on the wear mechanisms Al2O3 filled G-E composites was discussed.
Assessment of Cutting Parameters Influencing on Thrust Force and Torque during Drilling Particulate Filled Glass Fabric Reinforced Epoxy Composites  [PDF]
Bhadrabasol Revappa Raju, Bheemappa Suresha, Ragera Parameshwarappa Swamy, Bannangadi Swamy Gowda Kanthraju
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2013, DOI: 10.4236/jmmce.2013.13019
Abstract: Drilling is indispensable process and it cannot be avoided for joining composite structures used in various engineering applications. In this research article, the influence of drilling parameters on thrust force and torque of silica (SiO2) and alumina (Al2O3) filled into glass fabric reinforced epoxy (G-E) composites are analyzed. Drilling experiments are conducted on these composite materials using BATLIBOI make radial drilling machine. Two different drill bits (HSS and cemented carbide) are used for the experimentation. The influence of drilling parameters like cutting speed and feed on thrust force and torque on drilling of particulate filled G-E composites has been carried out. The experimental results indicated that the thrust force and torque were increased with increasing feed and cutting speed for all the composites tested. Further, it is observed that the carbide drill performed better than HSS drill during drilling of particulate filled G-E composites. The drilled surfaces are examined using scanning electron microscopy (SEM) and damage mechanisms are discussed.
An Unusual Case of Bilateral Empyema Associated with Bee Sting
Srinivasa Kaligonahalli Venkataramanappa,Amban Gowda,Srinivas Raju,Vijeth Harihar
Case Reports in Medicine , 2014, DOI: 10.1155/2014/985720
Abstract: Bee sting in most situations is life threatening. Spectrum of bee sting ranges from mild local reaction to death. The literature regarding the bee sting disease from India is sparse. The rare manifestations of the disease include encephalitis, polyneuritis, myocardial infarction, pulmonary edema, bleeding manifestations, and renal failure. Bee sting infections are rare and no field studies have been performed to determine the exact sequence of events that lead to infection of bee stings and if not treated properly can lead to fatal outcomes. Here we present a case of unusual bilateral empyema associated with bee sting. 1. Introduction The severity and duration of a bee sting reaction can vary from one person to another and at different occurrences in the same individual. These reactions were encountered in only 5% of the patients [1]. The spectrum of bee sting disease ranges from mild local reaction to death. The literature regarding the bee sting disease from India is sparse. Bee venom has many different effects on the human body. This is based on the dose of the bee venom. Bee venom, in certain cases, can have very strong toxic effects on humans. For a person who is hypersensitive to bee venom, even one sting can cause a serious or fatal reaction. Here we are reporting a case of bilateral empyema associated with bee sting. 2. Case Report A 27-year-old male presented with high grade fever, dyspnea, and dysphagia of three-day duration. On examination pulse was 110 beats/min, BP 130/90?mm of Hg, oxygen saturation was 96%; decreased breath sounds were heard in the left lower lung field areas. On the day of admission he developed pain abdomen and worsening of dyspnoea, oxygen saturation reduced to 86%, breath sounds were decreased in the left basal areas, and tenderness was present in left hypochondrium. Chest X-ray was suggestive of left hydropneumothorax and HRCT thorax revealed mediastinitis with left sided empyema (Figures 1 and 2); intercostal drainage tube was inserted, which revealed frank pus. After three days of antibiotic therapy fever, dyspnoea and dysphagia were still persistent, repeat chest X-ray revealed right sided pyothorax, and ICD was inserted on right side. Patient was on empirical antibiotic therapy; patient developed fever and breathlessness. Blood and empyema Culture results were negative. On reevaluation of the patient, he revealed the history of bee sting in the oral cavity three days prior to admission, ENT examination showed oedematous arytenoids leading to mediastinitis and bilateral empyema, barium swallow was performed which
Fixed combination of amlodipine and atorvastatin in cardiovascular risk management: patient perspectives
Madhuri Devabhaktuni, Sripal Bangalore
Vascular Health and Risk Management , 2009, DOI: http://dx.doi.org/10.2147/VHRM.S3339
Abstract: combination of amlodipine and atorvastatin in cardiovascular risk management: patient perspectives Review (4613) Total Article Views Authors: Madhuri Devabhaktuni, Sripal Bangalore Published Date April 2009 Volume 2009:5 Pages 377 - 387 DOI: http://dx.doi.org/10.2147/VHRM.S3339 Madhuri Devabhaktuni1, Sripal Bangalore2 1Department of Medicine, Division of Cardiology, St Luke’s Roosevelt Hospital, Columbia University College of Physicians and Surgeons, New York, NY, USA; 2Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USA Abstract: Hypertension and dyslipidemia are two of the most commonly co-occurring cardiovascular risk factors which together cause an increase in coronary heart disease-related events that is more than simply additive for anticipated event rates with each condition. Data have shown that even relatively small reductions in both blood pressure and cholesterol levels can lead to large reductions in the risk for cardiovascular events. However, though there are robust data on the beneficial effect of concomitant reduction in these risk factors, the reality is that this is achieved in 10% of patients. There is nonadherence with prescribed therapies with up to 50% of patients stopping their medications of their own volition for a variety of reasons. There is a reasonable evidence base to suggest that simplifying drug regimens and reducing pill burden will enhance patient adherence. The fixed-dose combination containing the antihypertensive agent amlodipine besylate and the statin atorvastatin is the first combination of its kind, which is both efficacious and safe and could potentially improve medication compliance, thereby improving the outcomes in these patients.
Fixed combination of amlodipine and atorvastatin in cardiovascular risk management: patient perspectives
Madhuri Devabhaktuni,Sripal Bangalore
Vascular Health and Risk Management , 2009,
Abstract: Madhuri Devabhaktuni1, Sripal Bangalore21Department of Medicine, Division of Cardiology, St Luke’s Roosevelt Hospital, Columbia University College of Physicians and Surgeons, New York, NY, USA; 2Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USAAbstract: Hypertension and dyslipidemia are two of the most commonly co-occurring cardiovascular risk factors which together cause an increase in coronary heart disease-related events that is more than simply additive for anticipated event rates with each condition. Data have shown that even relatively small reductions in both blood pressure and cholesterol levels can lead to large reductions in the risk for cardiovascular events. However, though there are robust data on the beneficial effect of concomitant reduction in these risk factors, the reality is that this is achieved in 10% of patients. There is nonadherence with prescribed therapies with up to 50% of patients stopping their medications of their own volition for a variety of reasons. There is a reasonable evidence base to suggest that simplifying drug regimens and reducing pill burden will enhance patient adherence. The fixed-dose combination containing the antihypertensive agent amlodipine besylate and the statin atorvastatin is the first combination of its kind, which is both efficacious and safe and could potentially improve medication compliance, thereby improving the outcomes in these patients.Keywords: amlodipine, atorvastatin, compliance, dyslipidemia, fixed-dose combination, hypertension
Supported TritonX-100 Polyaniline Nano-Porous Electrically Active Film onto Indium-Tin-Oxide Probe for Sensors Application  [PDF]
Raju Khan
Advances in Chemical Engineering and Science (ACES) , 2011, DOI: 10.4236/aces.2011.13021
Abstract: Supported tritonX100 polyaniline nano-porous electrically active film has been fabricated successfully onto indium-tin-oxide conducting probe using electrochemical polymerization process. The doping of TX-100 in the polymeric network of PANI was suggested using cyclic voltammeter, UV-vis spectroscopy, and Fourier Transform Infrared spectroscopy. The change in the surface morphology of PANI thin film due to incorporation of tritonX-100 was investigated using Atomic Forced Microscopy and porosity has been confirmed scanning electron microscopy, respectively. The surface morphology, uniformly disperse hexagonal close packing of TX-100 in PANI matrices due to the incorporation of TX-100 in polymeric network of PANI was confirmed by Atomic Force Microscopy. The electrical conductivity of PANI-TX-100 increases from 1.06 x 10-2 S/cm-1 to 4.95 x 10-2 S/cm-1 as the amount of TX-100 increases during the polymerization. The change in the morphology and electrical conductivity of PANI due to incorporation of TX-100 prove as a promising material for the sensing application.
Climbing on Pyramids
Jean Serra,Bangalore Ravi Kiran
Mathematics , 2012,
Abstract: A new approach is proposed for finding the "best cut" in a hierarchy of partitions by energy minimization. Said energy must be "climbing" i.e. it must be hierarchically and scale increasing. It encompasses separable energies and those composed under supremum.
Idiopathic Intracranial Hypertension in Sickle Cell Disease: A Paediatric Case Report  [PDF]
Bharath Gowda, Sanjay Sahi
Neuroscience & Medicine (NM) , 2013, DOI: 10.4236/nm.2013.44033
Abstract:

In this article, we present the case of a 12-year-old girl with sickle cell disease (SCD), who presented with the severe headache. She had bilateral 6th cranial nerve palsy and papilloedema. The common sickle cell-related vascular causes of headache were ruled out by neuro-imaging. She then had a lumbar puncture and was diagnosed with idiopathic intracranial hypertension (IIH). This case demonstrates that IIH can affect younger children with SCD and should form a part of differential diagnosis when investigating causes of headache in SCD.

Catalytic Feedstock Recycling of Polymers  [PDF]
Raju Francis, Beena Sethi
Advances in Materials Physics and Chemistry (AMPC) , 2012, DOI: 10.4236/ampc.2012.24B067
Abstract: This piece of study involves degradation of plastic waste in presence of two different catalysts. It was found in gas chromatography (GC) analysis results that in presence of these catalysts more than 80% of polymer by weight was converted into either liquid or gaseous hydrocarbons. These can be utilized as fuel or can be transformed into other useful products. Thermo gravimetric analysis (TGA) and differential scanning calorimetric (DSC) analysis of polymers suggest that presence of these catalysts lowers degradation temperature and change mechanism of degradation.


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