1,928 research outputs found
Change in the room temperature magnetic property of ZnO upon Mn doping
We present in this paper the changes in the room temperature magnetic
property of ZnO on Mn doping prepared using solvo-thermal process. The zero
field cooled (ZFC) and field cooled (FC) magnetisation of undoped ZnO showed
bifurcation and magnetic hysteresis at room temperature. Upon Mn doping the
magnetic hysteresis at room temperature and the bifurcation in ZFC-FC
magnetization vanishes. The results seem to indicate that undoped ZnO is
ferromagnetic while on the other hand the Mn doped ZnO is not a ferromagnetic
system. We observe that on addition of Mn atoms the system shows
antiferromagnetism with very giant magnetic moments.Comment: 5 figure
Degradation of o-Chlorophenol from aqueous solution by electro-fenton process
The study explores the utility of the electro-Fenton
process for the degradation of o-chlorophenol (o-CP)
from aqueous solution. The extent of degradation of o-CP
is found to be a function of applied current, electrolysis
time, concentration of o-CP and concentration of ferrous
ions. Under optimized conditions it is possible to achieve
efficiencies higher than 70%. Accelerating the regeneration
of Fe2+ ions in the electrolyte determines the efficiency
of the process. Addition of goethite as a catalyst in
the medium did not significantly improve the process
efficiency
Studies on species of Halimeda from Lakshadweep
Four Species of Halimeda viz. H. incrassata, H. opuntia. H simulans and H taenicola
collected from Lakshadweep islands are described in detail
Plants used as Medicine by Paliyar Tribes of Shenbagathope in Virudhunagar District of Tamilnadu, India
The traditional medicinal uses of 58 angiospermic plant species belonging to 54 genera of 31 families for various diseases and ailments like wounds, cuts, stomach pain, diabetes, fever, cold, poisonous bites etc., by the Paliyar tribes of Shenbagathope in Virudhunagar district of Tamilnadu, India, are mentioned. Generally, fresh part of the plant is used for the preparation of medicine. When fresh plant parts are not available, dried parts are also used. Attention should be made on proper exploitation and utilization of these ethnomedicinally important plant species
Theoretical Study of Physisorption of Nucleobases on Boron Nitride Nanotubes: A New Class of Hybrid Nano-Bio Materials
We investigate the adsorption of the nucleic acid bases, adenine (A), guanine
(G), cytosine (C), thymine (T) and uracil (U) on the outer wall of a high
curvature semiconducting single-walled boron nitride nanotube (BNNT) by first
principles density functional theory calculations. The calculated binding
energy shows the order: G>A\approxC\approxT\approxU implying that the
interaction strength of the (high-curvature) BNNT with the nucleobases, G being
an exception, is nearly the same. A higher binding energy for the G-BNNT
conjugate appears to result from a stronger hybridization of the molecular
orbitals of G and BNNT, since the charge transfer involved in the physisorption
process is insignificant. A smaller energy gap predicted for the G-BNNT
conjugate relative to that of the pristine BNNT may be useful in application of
this class of biofunctional materials to the design of the next generation
sensing devices.Comment: 17 pages 6 figure
Copper, zinc, iron and manganese in sediments and in the rock oyster Saccostrea cucullata in Mumbai coast
Sediment and oyster (Saccostrea cucullata) samples were collected at Dhanda, a fishing village in Mumbai, Maharashtra. The samples were analysed for copper, zinc, iron and manganese contents. Metal concentrations in the sediments and bioaccumulated levels in oysters were correlated. There is no positive correlation between the total sedimentary levels of metals analysed and the bioaccumulated levels of respective metals in oyster. A positive correlation between the bioavailable fractions of zinc, iron and manganese, and the bioaccumulated levels exists. Copper, however, shows a negative correlation with respect to the bioaccumulated levels
Factorizing Numbers with the Gauss Sum Technique: NMR Implementations
Several physics-based algorithms for factorizing large number were recently
published. A notable recent one by Schleich et al. uses Gauss sums for
distinguishing between factors and non-factors. We demonstrate two NMR
techniques that evaluate Gauss sums and thus implement their algorithm. The
first one is based on differential excitation of a single spin magnetization by
a cascade of RF pulses. The second method is based on spatial averaging and
selective refocusing of magnetization for Gauss sums corresponding to factors.
All factors of 16637 and 52882363 are successfully obtained.Comment: 4 pages, 4 figures; Abstract and Conclusion are slightly modified.
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Fish health management in cage aquaculture
Finfish is the primary source of animal protein for
humans in many parts of the world and per capita
consumption of fish has been increasing from an
average of 9.9 kg in the 1960s to 19.2 kg in 2012 (FAO,
2014). Growing global population, dwindling natural
fish stocks, and the increasing demand are the major
drivers for increasing fish production. Aquaculture
remains the only option to meet these demands and
globally, the share of aquaculture is projected to rise
to 62% of the total fish production by 2030. However,
considering the limitations of the traditional
aquaculture systems due to environmental issues,
carrying capacities etc., it has been recognized that
cage culture, especially mariculture has many
advantages. Over the years, cage culture has become
one of the economically viable methods of large-scale
production of high-value food fishes
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