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Viswanathan, M.
- Nutrition Studies on Black Wattle-I, Effect of Different N,P,K Fertilizer Combinations upto the 6th Year
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Indian Forester, Vol 106, No 6 (1980), Pagination: 397-402Abstract
The application of N, P, K Chemical fertilizers during the time of planting of Black Wattle increases bark thickness and the percentage of moisture that can be retained in the dried condition during tbe fifth year. During the sixth year the applications increase the tannin content. Diameter increase is significant during the third year.- Lyman Alpha Photometer: a far-ultraviolet sensor for the study of hydrogen isotope ratio in the Martian exosphere
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PDF Views:97
Authors
Raja V. L. N. Sridhar
1,
M. V. H. Rao
1,
K. Kalyani
1,
Anand Chandran
1,
Monika Mahajan
1,
J. D. P. V. Tayaramma
1,
K. V. S. Bhaskar
1,
K. B. Pramod
1,
L. V. Prasad
1,
A. S. Laxmiprasad
1,
P. Chakraborty
1,
J. A. Kamalakar
1,
G. Nagendra Rao
1,
M. Viswanathan
1
Affiliations
1 Laboratory for Electro-Optics Systems, Indian Space Research Organisation, Bengaluru 560 058, IN
1 Laboratory for Electro-Optics Systems, Indian Space Research Organisation, Bengaluru 560 058, IN
Source
Current Science, Vol 109, No 6 (2015), Pagination: 1114-1120Abstract
The Lyman Alpha Photometer (LAP), developed for flight on the Mars Orbiter Mission (MOM) spacecraft in 2013, is primarily designed to measure deuterium to hydrogen abundance ratio of the Martian exosphere over a 6-month period from a 263 km × 71,358 km elliptical orbit around Mars. A set of ultrapure (99.999%) hydrogen and deuterium gas-filled cells comprising tungsten filaments, a 25 mm diameter collection lens and a solar-blind photomultiplier tube together with an 8 nm bandpass Lyman alpha filter are the principal electro-optical assemblies of the instrument. This article presents scientific objectives of LAP and its performance specifications along with details of instrument design. The ground characterization techniques to assess LAP operational performance are also presented. End-to-end test results and evaluation matrix of LAP were satisfactory, well within the desired specifications. The first LAP onboard operation was carried out during the cruise phase of MOM spacecraft journey to verify its functionality and all recorded on-board health parameters were satisfactory.Keywords
Absorption gas cell, hydrogen isotope ratio, Martian exosphere, photometerReferences
- Velbel, M., Phoenix first to see silt grains on Mars. Nature, 2012,481(7379), 29–29.
- Williams, H. R. et al., Mars reconnaissance lander: vehicle and missiondesign. Planet. Space Sci., 2011, 59, 1621–1631.
- Arvidson, R. E. et al., Spirit Mars Rover Mission: overview and selectedresults from the northern Home Plate Winter Haven to the sideof Scamander crater. J. Geophys. Res. – Planets, 2010, 115, ArticleNumber: E00F03.
- Grant, M. J., Steinfeldt, B. A., Braun, R. D. and Barton, G. H., Smartdivert: a new Mars robotic entry, descent, and landing architecture. J. Spacecraft Rockets, 2010, 47, 385–393.
- Ball, A. J., Price, M. E., Walker, R. J., Dando, G. C., Wells, N. S. andZarnecki, J. C., Mars Phobos and Deimos Survey (M-PADS) – AMartian Moons orbiter and Phobos lander. Adv. Space Res.,2009, 43, 120–127.
- Goerke, D., Mission to Mars: 2025: What We Can Do, iUniverse, Inc. 2007, vol. I; ISBN:9780595415878.
- Nair, R. P., Saviour, L. T. and Ponraj, N., A comparative analysis andstudy on Martian satellites. Int. J. Eng. Trends Technol., 2014, 9, 262–266.
- Edberg, N. J. T. et al., Pumping out the atmosphere of Mars throughsolar wind pressure pulses. Geophys. Res. Lett., 2010, 37.
- Valeille, A., Combi, M. R., Bougher, S. W., Tenishev, V. and Nagy, A. F., Three-dimensional study of Mars upper thermosphere/ ionosphereand hot oxygen corona: 2. Solar cycle, seasonal variations, and evolution over history. J. Geophys. Res., 2009, 114, E11006; doi:10.1029/2009JE003389.
- Gillmann, C., Lognonne, P., Chassefiere, E. and Moreira, M., The present-day atmosphere of Mars: where does it come from? Earth Planet. Sci. Lett., 2009, 277, 384–393.
- Machacek, J. R. et al., Production of excited atomic hydrogen and deuteriumfrom H2, HD and D2 photodissociation. J. Phys. B, At Mol. Opt. Phys., 2011, 44, 045201 (7 pp).
- McKechnie, A. E., Wolf, B. O. and Martínez del Rio, C., Deuterium stableisotope ratios as tracers of water resource use: an experimentaltest with rock doves. Oecologia, 2004, 140, 191–200; doi:10.1007/s00442-004-1564-9.
- Owen, T., Maillard, J. P., Debergh, C. and Lutz, B., Deuterium on Mars: the abundance of HDO and the value of D/H. Science, 1988, 240, 1767–1770.
- Bjoraker, G. L., Mumma, M. J. and Larson, H. P., Isotopic abundance ratiosfor hydrogen and oxygen in the Martian atmosphere. Bull. Am. Astron. Soc., 1989, 21, 991.
- Korablev, O. I., Ackerman, M., Krasnopolsky, V. A., Moroz, V. I., Muller, C., Rodin, A. V. and Atreya, S. K., Tentative identification offormaldehyde in the Martian atmosphere. Planet. Space Sci., 1993, 41, 441–451.
- Watson, L. L., Hutcheon, I. D., Epstein, S. and Stolper, E. M., D/H ratios and water contents of amphiboles in magmatic inclusions inChassigny and Shergotty. Meteoritics, 1993, 28, 456.
- Esposito, L. W., Colwell, J. E. and McClintock, W. E., Cassini UVISobservations of Saturn’s rings. Planet. Space Sci., 1998, 46,1221–1235.
- Formisano, V., Grassi, D., Ignatiev, N., Zasova, L. and Maturilli, A., PFS for Mars Express: a new approach to study Martian atmosphere. Adv. Space Res., 2002, 29, 131–142.
- Ito, Yuichi and Fukunish, Hiroshi, A deuterium/hydrogen Lyman alphaabsorption cell photometer developed for the Nozomi spacecraft. TohokuGeophys. J., 2006, 37, 2, 109–123.
- Maki, J., Lawrence, G., Esposito, L., Lauche, H. and Ludwig, M., TheCassini hydrogen deuterium absorption cell: a remote sensing instrumentfor atomic D/H measurements at Titan. Bull. Am.Astron. Soc., 1996, 28, 1132.
- Babichenko, S. I. et al., Measurements in interplanetary space and inthe Martian upper atmosphere with a hydrogen absorption-cell spectrophotometerfor La-radiation on board Mars 4-7 spaceprobes. SpaceSci. Instrum., 1977, 3, 271–286.
- Sridhar Raja, V. L. N. et al., Design and engineering aspects of a compactLyman alpha photometer (LAP) for in situ measurements ofD/H ratio in Martian atmosphere. In 39th COSPAR ScientificAssembly, Mysore, India, C1.1-56-12, 2012, p. 1558.
- Eberhardt, P., Reber, M., Krankowsky, D. and Hodges, R. R., The D/H and 18O16/O ratios in water from comet P/Halley. Astron. Astrophys., 1995, 302, 301–316.
- Bockelée-Morvan, D. et al., Deuterated water in comet C/1996 B2 (Hyakutake) and its implications for the origin of comets. Icarus,1998, 193, 147–162.
- Lécuyer, C., Gillet, Ph. and Robert, F., The hydrogen isotope composition ofsea water and the global water cycle. Chem. Geol.,1998, 145, 249–261.
- Kawahara, T. D., Okano, S., Abe, T., Fukunishi, H. and Ito, K., Glass-type hydrogen and deuterium absorption cells developed for DyHratio measurements in the Martian atmosphere. Appl. Opt.,1997, 36, 2229–2237.
- Kawahara, T. D. et al., Development of hydrogen and deuterium absorptioncells for D/H ratio measurements of planetary atmospheres. TohokuGeophys. J., 1993, 34, 35–54.
- Efficient Sensing of Data when Aggregated with Integrity and Authenticity
Abstract Views :162 |
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Authors
Affiliations
1 Vel Tech University, Chennai - 600062, Tamil Nadu, IN
1 Vel Tech University, Chennai - 600062, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 3 (2016), Pagination:Abstract
Background/Objectives: The main objective of this paper is to gather and aggregate data in an efficient manner so that network lifetime is enhanced. Enhanced mechanisms for end-to-end encryption from the sensors to the sink, also termed converge cast traffic, address the concern of reducing both the energy consumption at the sensor nodes and the effect of physical attacks on the nodes. Concealed Data Aggregation provides a good balance between energy-efficiency and security while still allowing data to be processed at the nodes. Methods/Statistical analysis: In this paper, we first outline and discuss the formation of cluster nodes. In these each sensor node is controlled by the Cluster Head (CH) which in turn is controlled by a Base Station (BS). Then, an integrity and authenticity has been enhanced using Mykletun encryption scheme. Findings: To recover, the above issues a novel methodology has been proposed, which provides maximize data integrity and authenticity using Concealed Data Aggregation (CDA). This leads to reduce the transmission overhead and improves the overall lifetime of WSN. Applications/Improvements: We propose a novel approach using homomorphic encryption, Mykletun KeyGen and Boneh Signature Scheme to achieve confidentiality, integrity and availability for secure data aggregation in wireless sensor networks.Keywords
Base Station (BS), Cluster Head (CH), Concealed Data Aggregation (CDA), Privacy Homomorphism (PH), Sensor Nodes (SNs) ,Wireless Sensor Networks (WSN)- When Customer Care Turns into a Customer's Nightmare
Abstract Views :264 |
PDF Views:145
Authors
Affiliations
1 Acharya Bangalore B-School, Bengaluru, IN
2 Department of Management Studies (PG), Acharya Bangalore B School (ABBS), Bengaluru, Karnataka, IN
1 Acharya Bangalore B-School, Bengaluru, IN
2 Department of Management Studies (PG), Acharya Bangalore B School (ABBS), Bengaluru, Karnataka, IN