Akram,Alkershi K M; Dr.Joseph, K J; Dr.Menon,N R(Cochin University of Science and Technology, November , 2002)
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Abstract:
This thesis entitled “Contribution of size fractions of planktonic algae to primary organic productivity in the coastal waters of cochin,south west coast of india”. Marine ecosystems planktonic algae are the most important primary producers on wliich considerable attention is being given on account of their supreme status in the marine food chain.The study of primary production in the Indian Ocean started With DANA (I928-30),, John Murray t I933-34). Discovery ( I934) and Albatross (I947-48) expeditions which tried to evaluate productivity from nutrients and standing crop of phytoplankton .The bioproductivity of the marine environment is dependent on various primary producers. ranging in size from picoplankton to larger macro phytoplankton. The quantity and quality of various size fractions of planktonic algae at any locality depend mainly on the hydrographic conditions of the area .In the coastal waters of Cochin- south west coast of lndia. Planktonic algal community is composed mainly of the diatoms, the dinoflagellates, the blue-green algae and the silicoflagellates, the former two contributing the major flora and found distributed in the all size fractions. The maximum number of
species of diatoms at station 1 and station 2 was found in the pre-monsoon season.. The size groups of planktonic algae greater than 53 um are dominated by filamentous- chain forming and colonial diatoms. The coastal waters of Cochin. planktonic algae less than 53 um in
size contribute significantly to primary productivity and the biodiversity of the
microflora, indicating the presence of rich fishery resources in the south west coast of india.The study of different size fractions of planktonic algae and their relative contribution to the primary organic production is a useful tool for the estimation of the quantity and quality of fisheries.A deeper investigation on the occurrence of these microalgae and proper identification of their species would be of immense help for the assessment of the specificity and magnitude of fishery resources.
Description:
School of Marine Science, Department of Marine biology, Microbiology and Biochemistry, Cochin University of Science and Technology
Rajesh, S; Nandakumaran, V M(Elsevier, January , 2006)
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Abstract:
We show numerically that direct delayed optoelectronic feedback can suppress hysteresis and bistability in a directly modulated semiconductor laser. The simulation of a laser with feedback is performed for a considerable range of feedback strengths and delays and the corresponding values for the areas of the hysteresis loops are calculated. It is shown that the hysteresis loop completely vanishes for certain combinations of these parameters. The regimes for the disappearance of bistability are classified globally. Different dynamical states of the laser are characterized using bifurcation diagrams and time series plots.
The concept of convex extendability is introduced to answer the problem of finding the smallest
distance convex simple graph containing a given tree. A problem of similar type with respect
to minimal path convexity is also discussed.
Poulose Jacob,K; Preetha Theresa, Joy(arXiv preprint arXiv:1307.7563, July 29, 2013)
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Abstract:
Due to the advancement in mobile devices and wireless networks mobile cloud computing, which
combines mobile computing and cloud computing has gained momentum since 2009. The characteristics of
mobile devices and wireless network makes the implementation of mobile cloud computing more complicated
than for fixed clouds. This section lists some of the major issues in Mobile Cloud Computing. One of the key
issues in mobile cloud computing is the end to end delay in servicing a request. Data caching is one of the
techniques widely used in wired and wireless networks to improve data access efficiency. In this paper we
explore the possibility of a cooperative caching approach to enhance data access efficiency in mobile cloud
computing. The proposed approach is based on cloudlets, one of the architecture designed for mobile cloud
computing.
Description:
Global Journal of Computer Science and Technology
Network, Web & Security
Volume 13 Issue 8 Version 1.0 Year 2013
Poulose Jacob,K; Preetha Theresa, Joy(IEEE, July 18, 2012)
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Data caching can remarkably improve the
efficiency of information access in a wireless ad hoc
network by reducing the access latency and bandwidth
usage. The cache placement problem minimizes total data
access cost in ad hoc networks with multiple data items.
The ad hoc networks are multi hop networks without a
central base station and are resource constrained in terms
of channel bandwidth and battery power. By data caching
the communication cost can be reduced in terms of
bandwidth as well as battery energy. As the network node
has limited memory the problem of cache placement is a
vital issue. This paper attempts to study the existing
cooperative caching techniques and their suitability in
mobile ad hoc networks.
Description:
Data Science & Engineering (ICDSE), 2012 International Conference on
Sudha Kartha, C(Japan society of applied physica, November 8, 2006)
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Abstract:
Copper doped methylene blue sensitized poly(vinyl alcohol) (MBPVA)–acrylamide films were fabricated to improve the
storage life of recorded gratings. The films were fabricated using gravity settling method and the copper chloride
concentration was optimized as 3:18 10 3 mol/l for a dye concentration of 6:2 10 4 mol/l. The gratings recorded on the
optimized film constitution could be stored for months with stable diffraction efficiency (24%) without any chemical or
thermal fixing techniques. The resolution of the material is found to be unaffected with the addition of copper chloride.
Rani, Joseph(Department of Polymer Science and Rubber Technology, November 8, 2006)
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Abstract:
Copper doped methylene blue sensitized poly(vinyl alcohol) (MBPVA)–acrylamide films were fabricated to improve the
storage life of recorded gratings. The films were fabricated using gravity settling method and the copper chloride
concentration was optimized as 3:18 10 3 mol/l for a dye concentration of 6:2 10 4 mol/l. The gratings recorded on the
optimized film constitution could be stored for months with stable diffraction efficiency (24%) without any chemical or
thermal fixing techniques. The resolution of the material is found to be unaffected with the addition of copper chloride.
Sreekumar, K(Japaneese society of Applied physics, November 8, 2006)
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Abstract:
Copper doped methylene blue sensitized poly(vinyl alcohol) (MBPVA)–acrylamide films were fabricated to improve the
storage life of recorded gratings. The films were fabricated using gravity settling method and the copper chloride
concentration was optimized as 3:18 10 3 mol/l for a dye concentration of 6:2 10 4 mol/l. The gratings recorded on the
optimized film constitution could be stored for months with stable diffraction efficiency (24%) without any chemical or
thermal fixing techniques. The resolution of the material is found to be unaffected with the addition of copper chloride.
Prathapachandra Kurup, M R; Reena, T A(Elsevier, March 15, 2010)
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Abstract:
Five copper(II) complexes [CuLCl]2·CuCl2·4H2O (1), [CuLOAc] (2), [CuLNO3]2 (3), [CuLN3] (4) and
[CuLNCS]·3/2H2O (5) of di-2-pyridyl ketone-N4-phenyl-3-semicarbazone (HL) were synthesized and
characterized by elemental analyses and electronic, infrared and EPR spectral techniques. In all these
complexes the semicarbazone undergoes deprotonation and coordinates through enolate oxygen, azomethine
and pyridyl nitrogen atoms. All the complexes are EPR active due to the presence of an unpaired
electron. EPR spectra of all the complexes in DMF at 77K suggest axial symmetry and the presence of
half field signals for the complexes 1 and 3 indicates dimeric structures
Description:
Spectrochimica Acta Part A 76 (2010) 322–327 doi:10.1016/j.saa.2010.03.011
Mohammed Yusuff, K K; Rani, Abraham(Elsevier,Journal of Molecular Catalysis A: Chemical 198 (2003) 175–183, December 2, 2002)
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Abstract:
Copper(II) complexes of two biologically important ligands, viz., embelin (2,5-dihydroxy-3-undecyl-2,5-cyclohexadien
1,4-dione) and 2-aminobenzimidazole were entrapped in the cages of zeolite Y by the flexible ligand method. The capability
of these compounds in catalyzing the reduction of oxygen (industrially known as deoxo reaction) was explored and the
results indicate an enhancement of the catalytic properties from that of the simple copper ion exchanged zeolite. These
point to the ability of the ligands in enhancing the oxygen binding capability of the metal ion. Elemental analyses, Fourier
transform infrared (FTIR), diffuse reflectance and EPR spectral studies, magnetic susceptibility measurements, TG, surface
area analyses and powder X-ray diffraction studies were used in understanding the presence, composition and structure of
the complexes inside the cages. The study also reveals the increased thermal and mechanical stability of the complexes as a
result of encapsulation.
Rapheal,P F; Manoj, E; Prathapachandra Kurup, M R(Elsevier, 2007)
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Abstract:
Ten copper(II) complexes {[CuL1Cl] (1), [CuL1NO3]2 (2), [CuL1N3]2 · 2/3H2O (3), [CuL1]2(ClO4)2 · 2H2O (4), [CuL2Cl]2 (5), [CuL2N3] (6), [Cu(HL2)SO4]2 · 4H2O (7), [Cu(HL2)2] (ClO4)2 · 1/2EtOH (8), [CuL3Cl]2 (9), [CuL3NCS] · 1/2H2O (10)} of three NNS donor thiosemicarbazone ligands {pyridine-2-carbaldehyde-N(4)-p-methoxyphenyl thiosemicarbazone [HL1], pyridine-2-carbaldehyde-N(4)-2-phenethyl thiosemicarbazone [HL2] and pyridine-2-carbaldehyde N(4)-(methyl), N(4)-(phenyl) thiosemicarbazone [HL3]} were synthesized and physico-chemically characterized. The crystal structure of compound 9 has been determined by X-ray diffraction studies and is found that the dimer consists of two square pyramidal Cu(II) centers linked by two chlorine atoms.