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Research Paper

Analysis of heat dissipation in processor chipset with minichannel heat sink using nanofluids as cooling medium – A CFD approach

Due to the reduction in the size of the electronic components, heat dissipation has become a major problem. In many cases, air cooling has failed to provide the required demands. The invention of nanofluid has promised to increase the efficiency of the liquid cooling system. The addition of solid nanoparticles to the liquid actually increases the thermal conductivity of the liquid because of the higher thermal conductivity of the solid particles. In this work, the thermal performance of a minichannel heat sink was analyzed using CFD for cooling of processor chipset using nanofluids instead of pure water. The effect of different mass flow rates and various volume concentrations of nanoparticles on the overall thermal performance are also analyzed. The Alumina and graphene water nanofluids are used as coolants with volume concentrations of 0.1, 0.15 and 0.2%. The cooling fluid is made to flow through an Aluminium mini channel with height 5mm and width 1mm respectively. The maximum allowable temperature that has to be maintained at the chip is below 50oC. By using the liquid cooling system with a heat sink, this temperature is reduced as low as 41.22oC. There is also an enhancement of the convective heat transfer coefficient in using graphene nanofluids when compared to alumina nanofluids. The thermal resistance of the heat sink with nanofluids is lesser than pure water.

Published by: Ram Mohan R., Sujatha Abaranji, Elumalai P. V., Lakshmipathi Radhakrishnan

Author: Ram Mohan R.

Paper ID: V5I3-2054

Paper Status: published

Published: July 3, 2019

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Case Study

MRI imaging signs of Multiple System Atrophy ( MSA-C)

Multiple Systems Atrophy (MSA) is a neurologic disorder clinically characterized by parkinsonism, cerebellar ataxia, and autonomic failure. This disorder was previously known as “striatonigral degeneration sporadic olivopontocerebellar atrophy and “Shy-Drager syndrome Presence of neurogenic bladder is a characteristic feature of MSA. It is regarded as a sporadic disease with a prevalence of 4 per 1,00,000. Typically the symptoms begin between 40 and 60 years of age. It has two phenotypes: parkinsonian (MSA-P) and cerebellar (MSA-C). MRI brain acts as a diagnostic tool for MSA with the characteristic feature of “Hot cross bun' sign, seen as cruciform hyperintensity at the level of the pons in axial T2-weighted images in patients with MSA-C. We report here a case of a 55-year-old female patient who presented with complaint of gait instability, intention tremor, and orthostatic dizziness for the last 1 year. She also developed urinary incontinence from last 4 months

Published by: Dr. Harshvardhan Singh Rathore, Dr. Thahir V.U., Dr. Madan Manmohan, Dr. Nilesh Ingale

Author: Dr. Harshvardhan Singh Rathore

Paper ID: V5I3-2053

Paper Status: published

Published: July 2, 2019

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Research Paper

Comparison of three dimensional and two dimensional analyses of facial motion

The purpose of this study was to compare the amplitude of facial motion obtained using three-dimensional (3-D) and two-dimensional (2-D) methods. The amplitude of motion of fifteen facial landmarks during five maximal animations (smile, lip-purse, grimace, eye closure, and cheek-puff) was quantified in 3-D and 2-D using a video-based system. Results showed that the 3-D amplitudes were significantly larger than the 2-D amplitudes, especially for landmarks on the lower face during the smile animation. In the latter instance, the 2-D amplitudes underestimated the 3-D amplitudes by as much as 43%. The difference between 3-D and 2-D amplitudes was greater for 2-D amplitudes obtained from one camera rather than from multiple cameras. The results suggest that a 2-D analysis may not be adequate to assess facial motion during maximal animations and that a 3-D analysis may be more appropriate for detecting clinical differences in facial function.

Published by: Dr. Sandhya Lohakare

Author: Dr. Sandhya Lohakare

Paper ID: V5I3-2060

Paper Status: published

Published: July 2, 2019

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Thesis

Synthesis and antimicrobial activity of salicylaldehyde Schiff bases from aromatic amines

A new efficient and environmentally friendly procedure for the synthesis of a series of salicylaldehyde-based Schiff bases under conventional method is described. The method is compared with the microwave irradiation method also. The present work involves condensation of salicylaldehyde with various aromatic amines in water under the conventional method. A judicious choice of the solvent and reaction conditions allowed the final products to be generated in excellent yields in a one-step procedure, whereas experiments under thermal conditions led to lower yields with tedious work-up. The conventional method gives advantages like reduction in reaction time, increase in conversion, reduced wastes, and good yields.

Published by: D. Tirumala, M. Sangeetha

Author: D. Tirumala

Paper ID: V5I3-2036

Paper Status: published

Published: July 1, 2019

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Research Paper

Management information system for draglines and dumpers used in mines

Mother nature has bestowed our country with quality mineral deposits and today we are mining 87 minerals to support the Indian economy which is expected to grow at plus 7 % rate. This growth rate requires 10 to 12 % growth in mining sector every year. (1). Achieving such voluminous growth is only possible by employing huge Heavy Earth Moving Machineries ( HEMM). Big size machines are extremely costly, one 24 cum dragline cost @250 crores and one 240 ton dumper Rs 24 crores (2). The idle time cost of such costly machines is very high. Hence it calls for an efficient management information system (MIS) for better availability and utilization of machines. ( 3 ) GPS based MIS are available but their capital and operational cost is high as it requires specialized manpower. This calls for indigenous development of economical sensor based MIS packages which could produce temper proof online data along with facilities of analysis.

Published by: Manoj Tiwari, Dr Manish Uttarwar

Author: Manoj Tiwari

Paper ID: V5I3-1943

Paper Status: published

Published: July 1, 2019

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Thesis

A DC-DC converter using dickson charge pump voltage multiplier

The system is used to boost 20 V (from a solar cell or other sources) to 400 V. The converter is used to obtain 400 V which needs for integrating to 400V DC bus. Interleaved boost converters at the input side and Dickson charge pump based voltage multiplier at the output side are the main parts. Single source or two independent sources can be used. The modified Dickson charge pump voltage multiplier results in lower voltage stress on each capacitor for its voltage multiplier circuit and less number of diodes. Interleaved boost converter and Dickson charge pump voltage multiplier have been studied, designed and simulated. The design, open loop simulation and closed-loop simulation of the interleaved boost DC-DC converter based on modified Dickson charge pump voltage multiplier were done and compared with a conventional boost converter. The desired output voltage (400V) obtained. From the simulation results, it is evident that the output ripple voltage of the system with modification exhibits fewer ripples and it offers continuous input current than the conventional one. Also, the voltage across the capacitor is reduced and become uniform. Hence low rated capacitors with the reduced size are needed. The hardware part for the interleaved boost DC-DC converter based on modified Dickson charge pump voltage multiplier and conventional boost converter with Dickson charge pump voltage multiplier was done and desired output was obtained.

Published by: Jayalekshmi J. Prakash, Sreedevi G.

Author: Jayalekshmi J. Prakash

Paper ID: V5I3-2050

Paper Status: published

Published: July 1, 2019

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