Indian Naval Academy

Ezhimala, India

Indian Naval Academy

Ezhimala, India
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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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