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Faisal M.,PES Institute of Technology | Khasim S.,PES Institute of Technology | Khasim S.,University of Tabuk
Journal of Materials Science: Materials in Electronics | Year: 2013

Conducting polyaniline-stannous oxide (PAni-SnO) composites were synthesized by the in situ polymerization of aniline in the presence of SnO. The composites formed were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). As there is a greater need for materials with electromagnetic interference (EMI) shielding properties over a large operating frequency band, the present study highlights the dielectric and EMI shielding response of PAni-SnO composites in the microwave frequency range from 8 to 18 GHz (X and Ku bands). All the computations were based on microwave scattering parameters measured by transmission line waveguide technique. The EMI shielding effectiveness (EMI SE), return loss, microwave absorption and dielectric properties of the PAni-SnO composites were evaluated for various wt% of SnO (10, 20, 30, 40 and 50 wt%) in PAni. In X-band, the composites exhibits EMI SE in the range -18 to -23 dB, with microwave absorbance of 70-83 % and in the Ku-band, the composites exhibits EMI SE values of -17.5 to -22.5 dB with 67-85 % absorbance. Our investigations reveal that the PAni-SnO composites are potential candidates for EMI shielding applications for both the X and Ku bands. © 2013 Springer Science+Business Media New York.

Faisal M.,PES Institute of Technology | Khasim S.,PES Institute of Technology | Khasim S.,University of Tabuk
Iranian Polymer Journal (English Edition) | Year: 2013

Conducting polyaniline (PAni)-antimony trioxide (Sb2O 3) composites with different weight percentages (wt%) of Sb 2O3 in PAni have been synthesized by in situ chemical oxidative polymerization. The composites were structurally and morphologically characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Measurements of electromagnetic interference (EMI) shielding, complex permittivity and microwave absorbing as well as reflecting properties of the composites were carried out in the frequency range of 8-18 GHz, encompassing the microwave X and Ku bands of practical relevance. All the computations are based on microwave scattering parameters measured by transmission line waveguide technique. It is observed that the presence of Sb2O3 in the PAni matrix affects the electromagnetic shielding and dielectric properties of the composites at microwave frequencies. The composites have shown better shielding effectiveness (SE) in both the X (SE in the range -18 to -21 dB) and Ku (-17.5 to -20.5 dB) bands. ε′ and ε′′ values of the PAni-Sb2O3 composites are in the range of 64-37 and 63-30, respectively, in the frequency range of 8-18 GHz. Dielectric measurements indicated the decrease in dielectric constant with the increase in wt% of Sb2O3. The results obtained for the reflection and absorption coefficients indicated that PAni-Sb2O3 composites exhibit better electromagnetic energy absorption throughout the X and Ku bands. The results indicated that PAni-Sb2O3 composites can be used as potential microwave absorption and shielding materials. © 2013 Iran Polymer and Petrochemical Institute.

News Article | November 9, 2015

It's time to re-think how we get around, so this year's Biomimicry Student Design Challenge is dedicated to solving problems in our transportation system. The challenge asks students to look to nature to come up with ways to lessen the environmental impact of personal or public transportation, or to make transportation more responsive to user needs. The theme gives students a lot of room for creativity. Reducing the environmental impact of travel can mean creating fewer greenhouse gasses, lowering energy demands or cutting down on waste and pollution. Students from around the globe have already signed up, among them teams representing the Ontario College of Art and Design, the Escuela Superior de Diseno de Madrid, Bucknell University, Harvey Mudd College and the PES Institute of Technology in Bangalore. Students from the University of Calgary have participated in the Biomimicry Design challenge for the past three years. So far this year, the university has five teams registered. One of the teams is looking at how a cactus could inspire a better semi-truck. The group of six mechanical engineering students originally thought they'd model their design on a peregrine falcon. However, that proved to be a challenge. "There's so much research on birds of prey, that we really struggled to find something innovative," said Jeniece Galeano. "The cactus has proven to be promising." The team's design will also fulfill course requirements as their capstone project, and they plan to enter the University of Calgary's spring design fair. Although biomimicry is touched on in their program, team member Max Verbeurgt says there aren't currently any courses or programs focused on biomimicry. The Biomimicry Student Design Challenge aims to promote nature-inspired design solutions, but it also provides tools to students who want to learn more about biomimicry. Registering a team gives students access to a number of resources to help this process and doesn't require a complete design. The Biomimicry 3.8 Institute has hosted the challenge since 2009. The challenge is open to all students currently enrolled in a degree or certificate program, and interdisciplinary teams are strongly encouraged. Registration is open through February 7, 2014 and final designs are due April 20, 2014. Learn more about the challenge here.

Garg P.,Institute of Management Technology | Agarwal D.,PES Institute of Technology
Journal of Enterprise Information Management | Year: 2014

Purpose – The purpose of this paper is to examine the success of enterprise resource planning (ERP) implementation based on five identified items, i.e. top management commitment (TMC), user involvement (UI), business process reengineering (BPR), project management (PM) and ERP teamwork and composition (TWC) factors at Fortis hospital, Bangalore, India. It also tests a number of hypotheses and examines the hypothetical relationships among critical success items and success of ERP implementation. Design/methodology/approach – Empirical data were collected via a survey questionnaire/interview technique. A structured interview was planned and conducted with key executives of Fortis hospital who were familiar with success of ERP implementation progress as well as examination of company documentation supported by literature. Findings – A significant relationship was found between TMC, UI, BPR, PM and ERP TWC with success of ERP implementation at Fortis hospital. Originality/value – The value of this paper is that it presents any hospital wishing to implement ERP with a set of critical success factors. Understanding the critical success factors would lead to a smoother implementation in hospital industry.Although as a single case study the ability to generalize the findings is narrow, support from literature and experiences add the knowledge to ERP implementation in healthcare sector in India. © Emerald Group Publishing Limited.

Ramesh C.S.,PES Institute of Technology | Ahamed A.,PES Institute of Technology
Wear | Year: 2011

Al 6063 based in situ composites were manufactured from Al-10%Ti and Al-3%B master alloys by liquid metallurgy route. The in situ TiB2 reinforced Al 6063 composites were synthesized through the exothermic reaction between Al-10%Ti and Al-3%B master alloys, which were used in the ratio of 1:2 respectively in Al 6063 matrix alloy. Tribological properties of both Al 6063 matrix alloy and the developed in situ composites have been evaluated. Dry sliding friction and wear tests were carried out using a pin on disc type machine with steel counter disc hardened to HRC60. A load range of 10-50N with the sliding velocity varying from 0.209m/s to 1.256m/s were adopted. Results have revealed that the developed in situ composites have lowered coefficient of friction and wear rates when compared with Al 6063 matrix alloy under all the test conditions studied. The excellent wear resistance of the in situ composites results from the formation of fine TiB2 particles uniformly dispersed within the Al 6063 matrix alloy. The coefficient of friction of both matrix alloy and in situ composites decreased with increase in load, whereas it increased with increase in sliding velocity. However, wear rates of both matrix alloy and in situ composites increased with increase in both load and sliding velocity. © 2011 Elsevier B.V.

Ramesh C.S.,PES Institute of Technology | Keshavamurthy R.,PES Institute of Technology
Materials and Design | Year: 2011

Ni-P coated Si3N4 reinforced Al6061 composites were fabricated by liquid metallurgy route. Percentage of reinforcement was varied from 4wt% to 10wt% in steps of 2. The developed composites were subjected to microstructure and sand slurry erosive wear studies. The influence of experimental parameters such as slurry concentration, rotational speed of slurry, size of impinging particles and the test duration on slurry erosive wear behavior of developed composites have been studied. Results reveals that, Al6061-Si3N4 composites exhibited improved wear resistance when compared with the matrix alloy under identical test conditions. With increase in slurry concentration, rotational speed of slurry, test duration, size of impinging particles, the slurry erosive wear rates of both matrix alloy and developed composites increases. However, under all the tests conditions studied, the developed composites possess higher wear resistance when compared with that of matrix alloy. Energy dispersive spectroscopy (EDS), X-ray diffraction analysis (XRD) and X-ray photoelectron spectroscopy (XPS) techniques were used to identify the oxides/passive layer formed on the worn surfaces. Scanning Electron Microscopy (SEM) examinations were also carried out on worn surfaces to observe the possible mechanisms of material removal in the matrix alloy and developed composites. © 2010 Elsevier Ltd.

Mahesh K.,PES Institute of Technology
Advances in Knowledge Organization | Year: 2014

Knowledge organization of large-scale content on the Web requires substantial amounts of semantic metadata that is expensive to generate manually. Recent developments in Web technologies have enabled any user to tag documents and other forms of content thereby generating metadata that could help organize knowledge. However, merely adding one or more tags to a document is highly inadequate to capture the aboutness of the document and thereby to support powerful semantic functions such as automatic classification, question answering or true semantic search and retrieval. This is true even when the tags used are labels from a well-designed classification system such as a thesaurus or taxonomy. There is a strong need to develop a semantic tagging mechanism with sufficient expressive power to capture the aboutness of each part of a document or dataset or multimedia content in order to enable applications that can benefit from knowledge organization on the Web. This article proposes a highly expressive mechanism of using ontology snippets as semantic tags that map portions of a document or a part of a dataset or a segment of a multimedia content to concepts and relations in an ontology of the domain(s) of interest.

Ramesh C.S.,PES Institute of Technology | Keshavamurthy R.,PES Institute of Technology | Naveen G.J.,PES Institute of Technology
Wear | Year: 2011

Metallic coated reinforcements are currently gaining popularity as regards processing of high quality metal matrix composites (MMCs) by liquid metallurgy route. The major reasons being improvement of wettability between reinforcement and molten alloy and to eliminate interfacial reactions. Both these factors lead to inferior mechanical and tribological properties of developed MMCs with non uniform distribution of reinforcement. In the light of the above, the present work focuses on development of Al6061-SiCp (Ni-P coated) composites by stir casting followed by hot extrusion using 200. T hydraulic press at a temperature of 550. °C under different extrusion ratios. Extrusion ratios of 1:4, 1:5, 1:10 and 1:15.5 were adopted. Microstructure studies microhardness, tensile strength tests were conducted on hot extruded composites. Pin-on-disk wear tests were carried out at different loads and sliding velocities for the extruded composites at different extrusion ratios. SEM of worn surfaces was also carried out. As the extrusion ratio increases, microhardness and tensile strength of the composites increased. Further, under all the wear tests conditions studied, the wear resistance of the hot extruded MMCs was superior for the highest extrusion ratio studied. © 2011 Elsevier B.V.

Bhattacharjee B.,PES Institute of Technology | Chatterjee J.,PES Institute of Technology
Asian Pacific Journal of Cancer Prevention | Year: 2013

Background: Cardamom (Elettaria cardamom), also known as "Queen of Spices", has beentraditionally used as a culinary ingredient due to its pleasant aroma and taste. In addition to this role, studies on cardamom have demonstrated cancer chemopreventive potential in in vitro and in vivo systems. Nevertheless, the precise polypharmacological nature of naturally occurring chemo-preventive compounds in cardamom has still not been fully demystified. Methods:In this study, an effort has been made to identify the proapoptopic, anti-inflammatory, anti-proliferative, anti-invasive and anti-angiogenic targets of Cardamom's bioactive principles (eucalyptol, alpha-pinene, beta-pinene, d-limonene and geraniol) by employing a dual reverse virtual screening protocol. Experimentally proven target information of the bioactive principles was annotated from bioassay databases and compared with the virtually screened set of targets to evaluate the reliability of the computational identification. To study the molecular interaction pattern of the anti-tumor action, molecular docking simulation was performed with Auto Dock Pyrx. Interaction studies of binding pose of eucalyptol with Caspase 3 were conducted to obtain an insight into the interacting amino acids and their inter-molecular bondings. Results:A prioritized list of target proteins associated with multiple forms of cancer and ranked by their Fit Score (Pharm Mapper) and descending 3D score (Reverse Screen 3D) were obtained from the two independent inverse screening platforms. Molecular docking studies exploring the bioactive principle targeted action revealed that H- bonds and electrostatic interactions forms the chief contributing factor in inter-molecular interactions associated with anti-tumor activity. Eucalyptol binds to the Caspase 3 with a specific framework that is well-suited for nucleophilic attacks by polar residues inside the Caspase 3 catalytic site. Conclusion:This studyrevealed vital information about the poly-pharmacological anti-tumor mode-of-action of essential oils in cardamom. In addition, a probabilistic set of anti-tumor targets for cardamom was generated, which can be further confirmed by in vivo and in vitro experiments.

Balasangameshwara J.,PES Institute of Technology | Raju N.,Sri Ramakrishna Engineering College
IEEE Transactions on Computers | Year: 2013

Computational grids provide a massive source of processing power, providing the means to support processor intensive applications. The strong burstiness and unpredictability of the available resources raise the need to make applications robust against the dynamics of grid environment. The two main techniques that are most suitable to cope with the dynamic nature of the grid are load balancing and job replication. In this work, we develop a load-balancing algorithm by juxtaposes the strong points of neighbor-based and cluster-based load-balancing methods. We then integrate the proposed load-balancing approach with fault-tolerant scheduling namely MinRC and develop a performance-driven fault-tolerant load-balancing algorithm or PD-MinRC for independent jobs. In order to improve system flexibility, reliability, and save system resource, PD-MinRC employs passive replication scheme. Our main objective is to arrive at job assignments that could achieve minimum response time, maximum resource utilization, and a well-balanced load across all the resources involved in a grid. Experiments were conducted to show the applicability of PD-MinRC. One advantage of our approach is the relatively low overhead and robust performance against resource failures and inaccuracies in performance prediction information. © 1968-2012 IEEE.

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