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Shivaprasad K.V.,Bearys Institute of Technology | Chitragar P.R.,National Institute of Technology Karnataka | Nayak V.,National Institute of Technology Karnataka | Kumar G.N.,National Institute of Technology Karnataka
International Journal of Ambient Energy | Year: 2016

This article experimentally investigates the effect of spark timing on performance and emission characteristics of high-speed spark-ignition (SI) engine operated with different hydrogen–gasoline fuel blends. For this purpose, the conventional carbureted SI engine is modified into an electronically controllable engine, wherein an electronically controllable unit was used to control the ignition timings and injection duration of gasoline. The tests were conducted with different spark timings at the wide open throttle position and 3000 rpm engine speed. The experimental results demonstrated that brake mean effective pressure and engine brake thermal efficiency increased first and then decreased with the increase in spark advance. Peak cylinder pressure, temperature and heat release rate were increased until 20% hydrogen addition and with increased spark timings. NOx emissions were continuously increased with the increment in both spark timings and hydrogen addition, whereas hydrocarbon emissions were increased with spark timings but decreased with hydrogen addition. CO emissions were reduced with the increase in spark timing and hydrogen addition. © 2016 Informa UK Limited, trading as Taylor & Francis Group Source


Srinivasan R.,Aurigene Discovery Technologies Ltd | Srinivasan R.,Mangalore University | Narayana B.,Mangalore University | Sarojini B.K.,Mangalore University | And 3 more authors.
Letters in Drug Design and Discovery | Year: 2016

A series of novel spiro-piperidinyl pyrazolones were synthesized starting from the commercially available ethyl nipecotate. The Boc protected ethyl nipecotate was reacted with 5-bromo-2-furaldehyde in the presence of LDA to afford the β -hydroxy ester which was converted to the β -keto ester by oxidation using manganese dioxide. Furthermore, β-keto ester was treated with hydrazine to form the spiro-piperidinyl pyrazolone scaffold. The phenyl/heteroaryl substituted (6ai) and hetero/arylethynyl substituted (7a-d) spiro pyrazolone were prepared by Suzuki and Sonogashira coupling followed by deprotection of the protecting group. All the synthesized compounds were evaluated for their invitro antiviral activity against BPXV on Vero cells. Compound 6c, 6d and 7c in the series showed potent antiviral activity. © 2016 Bentham Science Publishers. Source


Kuriakose J.,Manipal University India | Amruth V.,Bearys Institute of Technology | Nandhini N.S.,Alagappa Chettiar College of Engineering And Technology
2014 International Conference on Information Communication and Embedded Systems, ICICES 2014 | Year: 2014

Localization is extensively used in Wireless Sensor Networks (WSNs) to identify the current location of the sensor nodes. A WSN consist of thousands of nodes that make the installation of GPS on each sensor node expensive and moreover GPS will not provide exact localization results in an indoor environment. Manually configuring location reference on each sensor node is also not possible in the case of dense network This gives rise to a problem where the sensor nodes must identify its current location without using any special hardware like GPS and without the help of manual configuration. Localization techniques make the deployment of WSNs economical. Most of the localization techniques are carried out with the help of anchor node or beacon node, which knows its present location. Based on the location information provided by the anchor node or beacon node, other nodes localize themselves. In this paper we present a succinct survey on the localization techniques used in wireless sensor networks covering its problems and research gap. © 2014 IEEE. Source


Crasta A.,Bangalore University | Khan S.A.,Bearys Institute of Technology
IET Conference Publications | Year: 2013

In the Present paper effect of angle of incidence on pitching derivatives of a delta wing with curved leading edges of a attached shock case is been studied. A Strip theory is used in which strips at different span wise location are independent. This combines with similitude to give a piston theory. From the results it is found that stiffness and damping derivatives in pitch increasing linearly up to angle of attack 25° and then non-linearity creeps in. The Present theory is valid only for attached shock case. Effects of wave reflection and viscosity have not been taken into account. Results have been obtained for hypersonic flow of perfect gases over a wide range of angle of attack and Mach number. Source


Ashfaq S.,University of Rajasthan | Khan S.A.,Bearys Institute of Technology | Rathakrishnan E.,Indian Institute of Technology Kanpur
International Review of Mechanical Engineering | Year: 2014

This paper presents the results of experimental studies to control the base pressure from a convergent nozzle to ascertain the effect of level of expansion on a suddenly expanded sonic flow. An active control in the form of four micro jets of 1 mm orifice diameter located at 900 intervals along a pitch circle diameter of 1.3 times the nozzle exit diameter in the base region was employed to control the base pressure. The area ratio (ratio of area of suddenly expanded duct to nozzle exit area) studied is 2.4. Experiments were conducted for nozzle pressure ratio (NPR) from 1.5 to 3, in steps of 0.5. The length-to-diameter (L/D) ratio of the enlarged duct was varied from 10 to 1, and tests were conducted for L/D 10, 8, 6, 5, 4, 3, 2 and 1. It is evident from the results that the flow field downstream of the reattachment-redevelopment is very complex. It is found that, unlike in the case passive controls, the favourable pressure gradient does not ensure augmentation of the control effectiveness for active control in the form of micro jets. To study the influence of micro jets on the quality of flow in the enlarged duct wall pressure was measured and it is found that the micro jets do not disturb the flow field in the duct. © 2014 Praise Worthy Prize S.r.l. - All rights reserved. Source

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