771 research outputs found
Anatomy of a Spin: The Information-Theoretic Structure of Classical Spin Systems
Collective organization in matter plays a significant role in its expressed
physical properties. Typically, it is detected via an order parameter,
appropriately defined for each given system's observed emergent patterns.
Recent developments in information theory, however, suggest quantifying
collective organization in a system- and phenomenon-agnostic way: decompose the
system's thermodynamic entropy density into a localized entropy, that solely
contained in the dynamics at a single location, and a bound entropy, that
stored in space as domains, clusters, excitations, or other emergent
structures. We compute this decomposition and related quantities explicitly for
the nearest-neighbor Ising model on the 1D chain, the Bethe lattice with
coordination number k=3, and the 2D square lattice, illustrating its generality
and the functional insights it gives near and away from phase transitions. In
particular, we consider the roles that different spin motifs play (in cluster
bulk, cluster edges, and the like) and how these affect the dependencies
between spins.Comment: 12 pages, 8 figures;
http://csc.ucdavis.edu/~cmg/compmech/pubs/ising_bmu.ht
Some derivations among Logarithmic Space Bounded Counting Classes
In this paper we show derivations among logarithmic space bounded counting
classes based on closure properties of that leads us to the result that
.Comment: 3 page
PRELIMINARY IN VIVO EVALUATION OF ANTI-INFLAMMATORY ACTIVITIES OF VARIOUS SOLVENT EXTRACTS OF CADABA INDICA LAM ON CARRAGEENAN-INDUCED PAW EDEMA IN SWISS ALBINO RATS
ABSTRACTObjective: Among the invention of novel anti-inflammatory agents from modern research and drug development, the natural sources exist asevergreen to produce potential secondary metabolites that possess multiple efficacy against inflammatory mediators with no adverse reactions.Methods: Accordingly, Cadaba indica lam (Capparidaceae) produced the positive results for phenol, flavonoids, steroid, and saponins in preliminaryphytochemical screening and exhibited the potent anti-inflammatory activity (100 mg/kg, 200 mg/kg) by methanolic leaf extract against carrageenaninducedpawedemausing ratsindose-dependentmanner stayedcloser toreferencestandardindomethacin (25mg/kg)comparedtopetroleumetherandaqueous extract.Results: Thus, the plant C. indica lam might be considered to posses potential secondary metabolites against inflammatory agents and act as lead toisolation of novel therapeutic compounds.Conclusion: The phytochemical test indicates the presence of phenol, flavonoids, steroid, and saponins in leaf extract of C. indica may be known topossess anti-inflammatory property. The result of anti-inflammatory activity produced by the methanolic extract was threshold of isolation of biomolecules from the natural sources in diverse drug development in the near future being responsible for the pharmaceutical industries.Keywords: Preliminary phytochemical, Cadaba indica, Anti-inflammatory
Automatic Lighting Mechanism on Highways during Midnight
This paper presents the key points in implementing automatic lighting mechanism on highway roads with the help of moving object detection in urban cities during midnight. The objective of the object detection system will be to detect objects confined in a particular area. The detection system will thus require important information like speed of moving objects, size of objects and number of vehicles on the road. The lighting system is responsible for switching off the lights in a particular area where the object detection monitoring system evaluates to a minimum threshold value. The lighting system will be active 350m to direction of the object moving in a particular direction
A CONCEPT ON THE DEVELOPMENT OF BUPRENORPHINE AUTOINJECTOR FOR SELF AND EMERGENCY ADMINISTRATION
Objective: In natural and man-made disasters, pain and infection would increase morbidity and mortality. In these situations immediate treatment is mandatory and the drug has to be absorbed faster. An auto injector would be useful. The objective of this study was to develop an analgesic auto injector with buprenorphine.Methods: The auto injector is a reusable device with a disposable drug cartridge, capable of injecting 1 or 2 ml of drug solution. Sterile water filled cartridges were made from a pharmaceutical company. Water was withdrawn from the cartridge under a laminar flow and buprenorphine hydrochloride was injected to make 0.05 mg/ml concentration. Sterility test was carried out before and after injecting buprenorphine in the cartridge by nutrient agar method and aerobic and anaerobic sterility test mediums. Buprenorphine was injected, intraperitoneally in rats through autoinjector and compared with manual injection for its efficacy as an analgesic using Eddy's hot plate.Results: The water filled cartridge as well as the buprenorphine drug filled cartridge was found to be sterile as no growth was observed in the nutrient agar and no turbidity was observed in the sterility test mediums. The analgesic effect of buprenorphine by autoinjector was found to be significantly (Kruskal Wallis ANOVA) more than manual injection and control group (median analgesic time in seconds, Control-4.0; manual injection–7.0; autoinjector–12.0).Conclusion: Water filled cartridge could be converted to drug filled cartridge aseptically. Buprenorphine administered through autoinjector was better as an analgesic than manual injection.Â
Contribution of microplankton and nannoplankton in the waters of a tropical estuary
Four different size groups of algae were sampled from Cochin Backwater by passing sea
water through different grades of bolting nylon. C assimilation, chlorophyll (chl.) a concentration
and cell numbers of each size group were determined throughout the year along with
those of non-fractionated material. The contribution of nannoplankton, largely composed of
diatoms, was found to be much greater than that of microplankton throughout the year. Pooled
values of fractionated material agreed closely with those of non-fractionated material, but no
regular seasonal trend was found in photosynthesis, chl. a and cell numbers of any size group. A
greater dominance of nannoplankton as primary producers over microplankton seems relevant
to food chain considerations, as filter-feeding larval stages are probably able to utilize nannoplankton
more efficiently than microplankton
New Samarium and Neodymium based admixed ferromagnets with near zero net magnetization and tunable exchange bias field
Rare earth based intermetallics, SmScGe and NdScGe, are shown to exhibit near
zero net magnetization with substitutions of 6 to 9 atomic percent of Nd and 25
atomic percent of Gd, respectively. The notion of magnetic compensation in them
is also elucidated by the crossover of zero magnetization axis at low magnetic
fields (less than 103 Oe) and field-induced reversal in the orientation of the
magnetic moments of the dissimilar rare earth ions at higher magnetic fields.
These magnetically ordered materials with no net magnetization and appreciable
conduction electron polarization display an attribute of an exchange bias
field, which can be tuned. The attractively high magnetic ordering temperatures
of about 270 K, underscore the importance of these materials for potential
applications in spintronics.Comment: 6 page text + 5 figure
Optical-phonon resonances with saddle-point excitons in twisted-bilayer graphene
Twisted-bilayer graphene (tBLG) exhibits van Hove singularities in the
density of states that can be tuned by changing the twisting angle . A
-defined tBLG has been produced and characterized with optical
reflectivity and resonance Raman scattering. The -engineered optical
response is shown to be consistent with persistent saddle-point excitons.
Separate resonances with Stokes and anti-Stokes Raman scattering components can
be achieved due to the sharpness of the two-dimensional saddle-point excitons,
similar to what has been previously observed for one-dimensional carbon
nanotubes. The excitation power dependence for the Stokes and anti-Stokes
emissions indicate that the two processes are correlated and that they share
the same phonon.Comment: 5 pages, 6 figure
Investigation of novel high T<SUB>c</SUB> superconducting oxides
Our results of microscopic and macroscopic studies of novel high Tc superconductors are discussed. They permit a straightforward comparison of the nature of the superconductivity in 40 K range (La2CuO4 type) and 90 K range (YBa2Cu3O7type) superconductors
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