5,355 research outputs found
Inference of the boundary layer structure over the oceans from satellite infrared measurements
The characteristics of the boundary layer of the atmosphere over the global oceans between about 50 deg N to 40 deg S were remotely sensed for three different periods, about 3 months each, during the year 1970. The spectral measurements made by Nimbus 4 Infrared Interferometer Spectrometer were used for this purpose
Ultrasonic assisted synthesis of activated carbon for electromagnetic shielding material from rice husk fibre
911-917Synthesis of any biomaterials/biocomposites for different applications like in electromagnetic wave communication, radar, satellite system needs the processing of its raw material. The suitability of raw material is a challenging task for fabrication technology depending on its type of work performed and efficiency. The surface modification/surface bleaching is performed to facilitate the fillers and matrix for good interlocking between them for improvement in mechanical strength. The material used for microwave absorption or energy storage device in low observable technology (LOT) needs good mechanical strength. The present paper encloses the treatment of raw materials like rice husk with suitable blended chemicals maleic acid with different alcohols. The optimized blended chemicals are determined by computation of different acoustic parameters with the propagation of ultrasonic wave in low frequency range. The rice husk are treated with the optimized blended solution which results in increase of porosity of the material and hence for the fabrication of composites. The element dispersion study images of untreated and treated rice husk signify the suitability of the material for synthesis of microwave absorbing materials
Ultrasonic assisted synthesis of activated carbon for electromagnetic shielding material from rice husk fibre
Synthesis of any biomaterials/biocomposites for different applications like in electromagnetic wave communication, radar, satellite system needs the processing of its raw material. The suitability of raw material is a challenging task for fabrication technology depending on its type of work performed and efficiency. The surface modification/surface bleaching is performed to facilitate the fillers and matrix for good interlocking between them for improvement in mechanical strength. The material used for microwave absorption or energy storage device in low observable technology (LOT) needs good mechanical strength. The present paper encloses the treatment of raw materials like rice husk with suitable blended chemicals maleic acid with different alcohols. The optimized blended chemicals are determined by computation of different acoustic parameters with the propagation of ultrasonic wave in low frequency range. The rice husk are treated with the optimized blended solution which results in increase of porosity of the material and hence for the fabrication of composites. The element dispersion study images of untreated and treated rice husk signify the suitability of the material for synthesis of microwave absorbing materials
Excess Observed in CDF and SUSY at the LHC
The recent excess observed by CDF in is
interpreted in terms of a possible supersymmetric origin. An analysis is given
of the parameter space of mSUGRA and non-universal SUGRA models under the
combined constraints from LHC-7 with 165 pb of integrated luminosity,
under the new XENON-100 limits on the neutralino-proton spin independent cross
section and under the CDF 90% C.L. limit reported
to arise from an excess number of dimuon events. It is found that the predicted
value of the branching ratio consistent with all
the constraints contains the following set of NLSPs: chargino, stau, stop or CP
odd (even) Higgs. The lower bounds of sparticles, including those from the LHC,
XENON and CDF constraint, are exhibited and the shift in
the allowed range of sparticle masses arising solely due to the extra
constraint from the CDF result is given. It is pointed out that the two sided
CDF 90% C.L. limit puts upper bounds on sparticle masses. An analysis of
possible signatures for early discovery at the LHC is carried out corresponding
to the signal region in . Implications of GUT-scale
non-universalities in the gaugino and Higgs sectors are discussed. If the
excess seen by the CDF Collaboration is supported by further data from LHCb or
D0, this new result could be a harbinger for the discovery of supersymmetry.Comment: References added, text update
Growth rings in tropical trees : role of functional traits, environment, and phylogeny
Acknowledgments Financial support of the Centre National de la Recherche Scientifique (USR 3330), France, and from the Rufford Small Grants Foundation (UK) is acknowledged. We thank the private farmers and coffee plantation companies of Kodagu for providing permissions and logistical support for this project. We are grateful to N. Barathan for assistance with slide preparation and data entry, S. Aravajy for botanical assistance, S. Prasad and G. Orukaimoni for technical inputs, and A. Prathap, S. Shiva, B. Saravana, and P. Shiva for field assistance. The corresponding editor and three anonymous reviewers provided insightful comments that improved the manuscript.Peer reviewedPostprin
The Role of in Two-pion Exchange Three-nucleon Potential
In this paper we have studied the two-pion exchange three-nucleon potential
using an approximate chiral symmetry of the
strong interaction. The off-shell pion-nucleon scattering amplitudes obtained
from the Weinberg Lagangian are supplemented with contributions from the
well-known -term and the exchange. It is the role of the
-resonance in , which we have investigated in detail in the
framework of the Lagrangian field theory. The -contribution is quite
appreciable and, more significantly, it is dependent on a parameter Z which is
arbitrary but has the empirical bounds . We find that the
-contribution to the important parameters of the depends
on the choice of a value for Z, although the correction to the binding energy
of triton is not expected to be very sensitive to the variation of Z within its
bounds.Comment: 14 pages, LaTe
Predictions in SU(5) Supergravity Grand Unification with Proton Stability and Relic Density Constraints
It is shown that in the physically interesting domain of the parameter space
of SU(5) supergravity GUT, the Higgs and the Z poles dominate the LSP
annihilation. Here the naive analyses on thermal averaging breaks down and
formulae are derived which give a rigorous treatment over the poles. These
results are then used to show that there exist significant domains in the
parameter space where the constraints of proton stability and cosmology are
simultaneously satisfied. New upper limits on light particle masses are
obtained.Comment: (An error in the reheating factor is corrected, strengthening the
conclusions, i.e. the region in parameter space where the relic density
constraints are satisfied is enlarged.
Testing Supergravity Grand Unification at Future Accelerator and Underground Experiments
The full parameter space of supergravity grand unified theory with
type proton decay is analysed using renormalization
group induced electroweak symmetry breaking under the restrictions that the
universal scalar mass and gluino mass are TeV (no extreme fine
tuning) and the Higgs triplet mass obeys . Future proton
decay experiments at SuperKamiokande or ICARUS can reach a sensitivity for the
mode of yr allowing a number of
predictions concerning the SUSY mass spectrum. Thus either the decay mode will be seen at these experiments or a
chargino of mass GeV will exist and hence be observable
at LEP2. Further, if yr,
then either the light Higgs has mass GeV or GeV i.e. either the light Higgs or the light chargino (or both) would be
observable at LEP2. Thus, the combination of future accelerator and future
underground experiments allow for strong experimental tests of this theory.Comment: 7 figures available upon request, CTP-TAMU-32/93, NUB-TH-3066/93 and
SSCL-Preprint-44
Efficacy of Certain Essential Oils and Insect Repellents Against Land Leeches
Relative efficacy of six essential oils, viz., Cinnamon, Citronella, Eucalyptus, Orange, Pine, Spearmint and four insect repellents i.e, Dimethyl phthalate (DMP), Dibutyl phthalate (DBP), Expel and Mylol was investigated against landleeches,Haemadipsa zeylanica montivindicis Moore, under laboratory conditions. Cinnamon oil was found to be the best among the essential oils and out of repellents, Mylol and DMP were effective equally
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