Indian Naval Academy

Ezhimala, India

Indian Naval Academy

Ezhimala, India
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Sundara Raman R.,Indian Naval Academy | Sankara Narayanan G.,Sree Sastha Institute of Engineering and Technology | Manoharan N.,AMET University
International Journal of Applied Engineering Research | Year: 2014

Excessive pollution caused by engine emission has led to serious environmental degradation in the past three to five decades. Researchers worldwide are striving hard for reducing the emission from the engine. But the uses of diesel-powered vehicles are increasing day-by-day. The diesel engines have acquired much wider application than ever because of their main advantages of higher power and lower cost of the fuel. Although diesel exhaust is relatively clean with respect to unburnt hydrocarbons and carbon monoxide, it contains pollutants like particulate matter and oxides of nitrogen with greater exhaust noise. The paper reports on the control of the engine exhaust noise by a particulate trap for DI diesel engine. The experimental work comprises of design and development of the particulate trap for the given engine to control the exhaust noise level. The noise level reduction is also studied using a muffler. The reduction in noise level using particulate trap and muffler is experimentally investigated and compared. The noise level without particulate trap and muffler is 132 dB, with trap 116 dB, with muffler 125 dB. The percentage reduction in noise level is 12.5% with trap and is 9% with muffler. © Research India Publications.


Sundara Raman R.,Indian Naval Academy | Sankara Narayanan G.,Sree Sastha Institute of Engineering and Technology | Manoharan N.,AMET University
International Journal of Applied Engineering Research | Year: 2014

The smart structures are sometimes called “intelligent” or “adaptive” structures, being a class of advanced structures having highly distributed actuators and sensors combined with structural functionality, distributed control functions and even computing architectures. The structures are able to vary their geometric configurations as well as their physical characteristics subject to control laws. These include piezoelectric, electrostrictives, magnetostrictives, ionic polymers, SHAPE MEMORY ALLOYS (SMA), and magnetic shape memory alloys (MSMAs). Development of smart structures involves the integration of active and passive material systems, often including the coupling of relevant mechanical, electrical, magnetic, thermal, or other physical properties. This can subject the active materials to large stress levels, cyclic loads, thermal loads, or environmental loads that result in non-linear responses and large variations in material properties. Smart materials are not only singular materials; rather, they are also hybrid composites or integrated systems of materials. Shape memory alloys (SMAs) are one of the major elements of smart hybrid composites because of their unique properties, such as shape memory effect, pseudo elasticity and high damping capacity. These properties in smart hybrid composites provide tremendous potential for creating new paradigms for material-structural interactions and demonstrate various successes in many engineering applications, such as vibration control, actuators in MEMS, and a variety of others. © Research India Publications.


Dhaman R.K.,Kerala University | Dhaman R.K.,Indian Naval Academy | Satyanarayana M.,Kerala University | Jayeshlal G.S.,Kerala University | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

Cirrus clouds have been identified as one of the atmospheric component which influence the radiative processes in the atmosphere and plays a key role in the Earth Radiation Budget. CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation) is a joint NASA-CNES satellite mission designed to provide insight in understanding of the role of aerosols and clouds in the climate system. This paper reports the study on the variation of cirrus cloud optical properties of over the Indian sub - continent for a period of two years from January 2009 to December 2010, using cloud-aerosol lidar and infrared pathfinder satellite observations (Calipso). Indian Ocean and Indian continent is one of the regions where cirrus occurrence is maximum particularly during the monsoon periods. It is found that during the south-west monsoon periods there is a large cirrus cloud distribution over the southern Indian land masses. Also it is observed that the north-east monsoon periods had optical thick clouds hugging the coast line. The summer had large cloud formation in the Arabian Sea. It is also found that the land masses near to the sea had large cirrus presence. These cirrus clouds were of high altitude and optical depth. The dependence of cirrus cloud properties on cirrus cloud mid-cloud temperature and geometrical thickness are generally similar to the results derived from the ground-based lidar. However, the difference in macrophysical parameter variability shows the limits of space-borne-lidar and dissimilarities in regional climate variability and the nature and source of cloud nuclei in different geographical regions. © 2016 SPIE.


Dhaman R.K.,Kerala University | Dhaman R.K.,Indian Naval Academy | Satyanarayana M.,Kerala University | Krishnakumar V.,Stgregorios College | And 4 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

Cirrus clouds play a significant role in the Earths radiation budget. Therefore, knowledge of geometrical and optical properties of cirrus cloud is essential for the climate modeling. In this paper, the cirrus clouds microphysical and optical properties are made by using a ground based lidar measurements over an inland tropical station Gadanki (13.5°N, 79.2°E), Andhra Pradesh, India. The variation of cirrus microphysical and optical properties with mid cloud temperature is also studied. The cirrus clouds mean height is generally observed in the range of 9-17km with a peak occurrence at 13- 14km. The cirrus mid cloud temperature ranges from -81°C to -46°C. The cirrus geometrical thickness ranges from 0.9- 4.5km. During the cirrus occurrence days sub-visual, thin and dense cirrus were at 37.5%, 50% and 12.5% respectively. The monthly cirrus optical depth ranges from 0.01-0.47, but most (<80%) of the cirrus have values less than 0.1. Optical depth shows a strong dependence with cirrus geometrical thickness and mid-cloud height. The monthly mean cirrus extinction ranges from 2.8E-06 to 8E-05 and depolarization ratio and lidar ratio varies from 0.13 to 0.77 and 2 to 52 sr respectively. A positive correlation exists for both optical depth and extinction with the mid-cloud temperature. The lidar ratio shows a scattered behavior with mid-cloud temperature. © 2016 SPIE.


Ashkar Mohammed M.,NICHE | Navas Chokli M.,Indian Naval Academy
International Journal of Applied Engineering Research | Year: 2015

From the initial stages of public key cryptography, mainly two types of cryptosystems were used to overthrow the attacks. Therefore these two cryptosystems called as RSA and El Gamal are mainly preferred and commonly used. They can be used for encryption and decryption as well as digital signatures. In 1985, Victor Miller and Neal Koblitz invented the Elliptic Curve Cryptography that received more attention widely and formed a suitable substitution for the traditional public key cryptosystems like RSA in the application level. For realizing the protocols such as Elliptic Curve Digital Signature Algorithm(ECDSA), Diffie-Hellman key Exchange, Elgamal Encryption and Decryption etc the Elliptic Curve Cryptography is preferred. An algorithm based on modular multiplication called as Karatsuba multiplication is used here for developing the elliptic curve cryptosystem in the Galois field. The finite field operations in the elliptic curve is used in implementing the Elliptic Curve Digital Signature Algorithm. The algorithm confirmed the suitability of the VLSI implementation of the Elliptic Curve Cryptography. © Research India Publications.


Narula K.,Indira Gandhi Institute of Development Research | Narula K.,Indian Naval Academy
International Journal of Sustainable Energy | Year: 2014

This paper presents an indicator-based approach to highlight the emerging trends in energy security and sustainability for India over the past four decades. It selects four dimensions of Sustainable Energy Security (SES),namely Availability, Acceptability, Affordability and Efficiency and their corresponding indicators to represent SES. Thereafter, using quantitative data, the study establishes that certain indicators show increasing SES, while certain others show decreasing SES for India. Interpretation of these indicators leads to the conclusion that at the dimensional level 'Availability' and 'Efficiency' indicate increasing SES, while 'Acceptability' and 'Affordability' dimensions indicate decreasing SES. This study, therefore, gives valuable insights into the multi-dimensional aspects of SES and the emerging trends in SES for India. © 2013 © 2013 Taylor & Francis.


Joshi G.M.,Vellore Institute of Technology | Deshmukh K.,Vellore Institute of Technology | Pandey M.,Vellore Institute of Technology | Polu A.R.,Vellore Institute of Technology | And 3 more authors.
International Journal of ChemTech Research | Year: 2014

We fabricated the polymer Polyvinyl alcohol (PVA) composed with nano entities conducting carbon black (CCB) and monomotrile clay (MMT). The electrical properties as a function of DC bias were disclosed by using an Impedance analyzer. The optimized very high dielectric constant was demonstrated in the range of 105. The basic mechanism of this composite polarization follow Maxwell-Wangner Polarization model confirmed at lower frequency. The entire polarization process was controlled by using an external DC bias voltage (0-20 volts). This investigation may be useful for packaging and electronic applications.


Golghate C.D.,Indian Naval Academy | Pawar M.S.,Brahmdevdada Mane Institute of Technology
International Journal of Sustainable Engineering | Year: 2012

The green supply chain (GrSC) performance for different industries is varying. It depends on the GrSC framework adoption and its implementation. In this line, this paper discusses the plastic films supply chain for its environmental pollutants through the 'environmental effect multi-fishbone' diagram. The paper reports the five steps suggested for developing the framework for GrSC for plastics. The construct is developed and reported based on the theoretical tools available in the GrSC arena and elaborates 'green supply chain for plastic' as a method for the convergence of the plastic manufacturing industry and the environment. © 2012 Copyright Taylor and Francis Group, LLC.

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