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Search Results: 1 - 10 of 501 matches for " Karavadappa Basavarajappa Prasanna "
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Finite Element Analysis and Vibration Control of a Deep Composite Cylindrical Shell Using MFC Actuators
Gangolu Vijay Kumar,Samikkannu Raja,Karavadappa Basavarajappa Prasanna,Valliappan Sudha
Smart Materials Research , 2012, DOI: 10.1155/2012/513271
Abstract: A four-node composite facet-shell element is developed, accounting for electromechanical coupling of Macrofiber Composite (MFC) and conventional PZT patches. Further a warping correction is included in order to capture correctly the induced strain of conformable MFC, surface bonded on a cylindrical shell. The element performance to model the relations between in-plane electric field to normal strains is examined with the help of experiment and ANSYS analysis. In ANSYS, a simple modeling scheme is proposed for MFC using a parallel capacitors concept. The independent modal space control technique has been revisited to address the control of combination resonances through a selective modal space control scheme, where two or more modes can be combined to form the vibrating system or plant in modal domain. The developed control schemes are implemented in a digital processor using DS1104 and the closed-loop vibration control experiments are conducted on a CFRP shell structure. The influence of directionally induced actuation of MFC actuators on elastic couplings of composite shell is studied theoretically and is subsequently demonstrated in experiments. MFC actuators provide the much needed optimization domain for achieving the vibration control of combination resonances of elastically coupled deep-shell structure. 1. Introduction Active control techniques are becoming more popular in recent years due to the emergence of a field called “Smart Materials and Structure.” Smart materials such as piezoelectric, shape memory alloys, and magnetostrictive have got multi functional behaviors, namely, actuation, sensing, and load carrying. Among these, the electromechanically coupled piezoelectric materials possess immense potentials because of its dynamic characteristics (wider frequency band, large force) and their availability in different forms (bar, patch, composite, stack, etc.). Piezoelectric patches and composites such as Macrofibre Composite (MFC), Active Fibre Composite (AFC) are increasingly considered as actuators by research communities to address various vibration control-related problems in recent years [1–7]. Shell structures are commonly adopted in aerospace vehicles [8]. The wing panels, fuselage outer skins, tail panels, and so forth are constructed with shell structural elements using aluminum and composite materials. Light weight aerospace, naval and civil engineering structures usually employ shell configurations to attain structural efficiencies such as improved stiffness, desired shape, optimal weight, and aeroelastic characteristics. Although
Journal of Engineering Science and Technology , 2011,
Abstract: This paper presents an investigation on the influence of fiber volume reinforcement on various aspects of machining. Drilling experiments were conducted to study the tool wear, surface finish, delamination factor and hole quality on GFRP composites. The work reports the variation of tool wear, surface roughness, hole quality, chip characteristics, delamination factor with the variation of fibre volume reinforcement. Results revealed that the increase in fiber percentage increased the tool wear, delamination factor, surface roughness value and decreased hole quality. Minimum surface roughness, tool wear and better hole quality was obtained for 30% fibre content composites. 70% Fibre content composites produced hazardous surface roughness. Pull out of fibres and fibril formation are significant in decreasing the hole quality and increased surface roughness. Increased tool – fibre interaction and thermal softening of the tool causes increased tool wear. In higher fibre content composites, extensive plasticity was absent consequently brittle ceramic fibres were fractured easily. Hence small segment type chips were obtained. The fibre pull out and fibrils present near the hole exit forms the remainder of the laminate causes increased damage zone near the hole exit. Hence high delamination factor was obtained.
Light D wave meson spectrum in a relativistic harmonic model with instanton induced interaction  [PDF]
Antony Prakash Monteiro, Kanti Basavarajappa Vijaya Kumar
Natural Science (NS) , 2010, DOI: 10.4236/ns.2010.211156
Abstract: The mass spectrum of the D wave mesons is considered in the frame work of relativistic harmonic model (RHM). The full Hamiltonian used in the investigation has the Lorentz scalar plus a vector harmonic-oscillator potential, the confined-one-gluon-exchange potential (COGEP) and the instanton-induced quark-antiquark interaction (III). A good agreement between calculated D wave meson masses with experimental D wave meson masses is obtained. The respective role of III and COGEP in the D wave meson spectrum is discussed.
The Visible minority population in Canada: a review of numbers, growth and labour force issues
Basavarajappa, Kogular,Samuel, John
Canadian Studies in Population , 2006,
Abstract: English In this paper, the Visible Minority Population in Canada: Numbers, Growth andLabour Force Issues, the characteristics of the visible minority population andlabour force are examined including those employed by firms under theLegislated Employment Equity Program and the Federal Contractors Program.The future growth of the visible minority labour force and the socio-economicimpact of the findings are discussed along with their implications. French Dans cet article : La population de minorité visible au Canada : nombres,croissance et problèmes de la population active, les caractéristiques de lapopulation générale et de la population active des minorités visibles sontexaminées y compris celles qui sont utilisées par les firmes sous le Programmelégiféré d’équité en matière d’emploi et le Programme de contrats fédéraux. Lacroissance future de la population active de minorité visible et l’impact socioéconomique des conclusions sont discutées ainsi que leurs implications.
Effect of Filler Materials on Dry Sliding Wear Behavior of Polymer Matrix Composites – A Taguchi Approach  [PDF]
S. Basavarajappa, K.V. Arun, J. Paulo Davim
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2009, DOI: 10.4236/jmmce.2009.85034
Abstract: The tribological behaviour of glass epoxy polymer composites with SiC and Graphite particles as secondary fillers was studied using a pin-on-disc wear rig under dry sliding conditions. The influence of wear parameters like, applied load, sliding speed, sliding distance and percentage of secondary fillers, on the wear rate were investigated. A plan of experiments, based on the techniques of Taguchi, was performed to acquire data in a controlled way. An orthogonal array and analysis of variance (ANOVA) were employed to investigate the influence of process parameters on the wear of these composites. The results showed that the inclusion of SiC and Graphite as filler materials in glass epoxy composites will increase the wear resistance of the composite greatly.
An Integrated Wideband Multifunctional Antenna Using a Microstrip Patch with Two U-Slots
Basavarajappa Vedaprabhu;Kalarickaparambil Joseph Vinoy
PIER B , 2010, DOI: 10.2528/PIERB10050402
Abstract: In this paper a multifunctional microstrip antenna is designed, fabricated and experimentally verified for operation in AWS, GSM, WiMAX and WLAN bands. This microstrip patch antenna has two U-shaped slots to achieve the dual wideband operation required to meet these specifications. The dimensions and locations of the U-slots are designed appropriately. The thick substrate used here helps in integrating the antenna with the existing aircraft panel material while achieving wide bandwidths. Experimental results of this single feed antenna indicate that it meets all current requirements for in-cabin wireless communication needs.
Detection of extended spectrum beta-lactamase from clinical isolates in Davangere
Sridhar Rao P,Basavarajappa K,Krishna G
Indian Journal of Pathology and Microbiology , 2008,
Abstract: Extended spectrum β-lactamase enzymes (ESBLs) are enzymes that have the ability to hydrolyze oxyiminocephalosporins and infections by isolates producing them are often difficult to treat. A study to detect the presence of these enzymes in isolates was conducted by our hospital. A total of 207 non repetitive isolates were screened for resistance to any of five screening agents. Those with suspicious profiles were checked for ESBL production by double-disk approximation or a synergy test. The isolates were also subjected to a phenotypic confirmation test as recommended by CLSI (formerly NCCLS). Various cephalosporins-β-lactamase inhibitor combinations were also tested. Of the 204 (98.5%) screen-positive isolates, only 126 (61.7%) were identified as ESBL producers. Of these, 26.1% of the isolates were positive by using the double-disk synergy test (DDST) method alone, 13.4% were positive using the method recommended by CLSI, and 60.3% of the isolates were positive by both the DDST and CLSI methods. We also report a high percentage of resistance to cefoxitin (96.8%) indicating changes in porins.
Hot Rolling and Ageing Effect on the Pseudoelasticity Behaviour of Ti-Rich TiNi Shape Memory Alloy  [PDF]
Narendranath. S., Vijay Desai, S. Basavarajappa, K.V. Arun, S. Manjunath Yadav
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.94025
Abstract: This paper presents the findings of an experimental study of how ageing temperature affects the pseudoelasticity (PE) and its phases of Shape Memory Alloy (SMA). These have been examined by means of tensile testing machine and X-ray diffraction (XRD). By increasing the ageing temperature (constant ageing time) from 350oC to 550oC critical stress for martensite formation and psuedo-elastic elongation increased. However, specimen aged at 650oC showed a decrease in the critical stress for martensite formation and psuedo-elastic elongation. After second and third sequence of loading and unloading, the critical stress shifted towards higher side was observed. The XRD measurement revealed that phases present in the matrix drastically changes with ageing temperatures. Transformation was taking place in two-way transformation, i.e., during heating martensite (B19') transformed to austenite (B2) while cooling the austenite (B2) transformed back to martensite (B19') .
Effect of Applied Load on Dry Sliding Wear Property of Aged TiNiCu Alloy  [PDF]
Narendranath. S, S. Basavarajappa, K.V. Arun, S. Manjunath Yadav
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2010, DOI: 10.4236/jmmce.2010.99058
Abstract: Titanium Nickel Shape Memory Alloy (SMA) has demonstrated its great potential for a large variety of applications. This alloy is being actively applied to the development of new energy conversion systems, to the design for new robots and smart material systems and to the development of medical implants and instruments. In addition to its shape memory effect, it is necessary to understand the wear behavior of Titanium Nickel SMA Alloys. Hence in this article the wear behaviour of a TiNiCu+ alloy aged at different temperature have been studied against EN 31 steel (62HRc). The results indicate that the ageing temperature greatly affect the dry sliding wear behavior of TiNiCu alloy.
Management of Chronic (Anal) Perineal Pain (A Case Report)
Athma Prasanna
Indian Anaesthetists' Forum , 2009,
Abstract: Chronic perineal pain is a debilitating condition with a significant impact on the quality of life. Often, the pain localised to the perineum can be a warning sign of acute or chronic tissue injury to the abdominal and pelvic organs or structures,with no identifiable pathology. The management of a case of perineal pain with combination of treatment modalities is presented.
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