470 research outputs found
MICROANGIOGRAM VIDEO COMPRESSION USING ADAPTIVE PREDICTION
Coronary angiography is an X-ray examination of the heart\u27s arteries. This is an essential technique for diagnosis of heart damages. Image sequences from digital angiography contain areas of high diagnostic interest. Loss of information due to compression for regions of interest (ROI) in angiograms is not tolerable. Since Commercially available technology such as JPEG and MPEG do not satisfy medical requirements due to their severe blockartifacts. In this paper, a new compression algorithm that achieves high compression ratio and excellent reconstruction quality for video rate or sub-video rate angiograms is developed. The proposed algorithm exploits temporal spatial and spectral redundancies in backward adaptive fashion with Extremely low side information. An experimental result shows that the proposed scheme provides significant improvements in compression efficiencies
Impact of Seasonal Changes on Water Characterstics at Palakkad in 2021-2022
Geometric increase in population coupled with rapid urbanization, industrialization and agricultural development has resulted in high impact on quality and quantity of water in India. Hence, the availability and the quality of the freshwater resources are the most pressing of the many environmental challenges in India (CPCB 2011). The quality of water is of vital concern for mankind, since it is directly linked with human welfare. Poor quality of water adversely affects the plant growth and human health (WHO 1984; Hem 1985). A number of studies on water quality have been carried out in different parts of India All these studies reveal that both rivers and groundwater in India are facing water quality issues.
The state of Kerala, located in the south-western corner of India, is blessed with 44 rivers and heavy rainfall of ~ 3000 mm/year. However, most of the water in the rivers is quickly drained into the Arabian Sea due to the steep seaward sloping of the state. Hence, in addition to rivers, the groundwater is also utilized to meet the water requirements of the state. The increase in population, development activities, urbanization, change in land-use pattern, etc. has created a concern among the people of Kerala regarding both the river water and groundwater quality of various river basins
Assessment of provisional ecosystem services in Vypin Island, Cochin Backwater and payment for coastal ecosystem services
Assessment of provisional ecosystem services in Vypin Island, Cochin Backwater and payment for coastal ecosystem service
Spanner crab Ranina ranina recorded off Puducherry coast
The Spanner crab or Red Frog crab Ranina ranina (Linnaeus, 1758) a true brachyuran crab is the only extant species of its genus in the Family Raninidae. The species characteristically has an elongated, anteriorly broad, reddish brown carapace covered by low rounded
scale like spines. Geographically they are distributed in the Indo Pacific region in sandy substrata at depths
between 10 and 70 m and are commercially exploited in Hawaii, Japan, Seychelles and parts of Australia mainly using baited traps
Evolving market chains for Indian oil sardine
Indian oil sardine, Sardinella longiceps forms a major
catch of traditional fisherman in Kerala throughout the
year. After the peak landing of nearly four lakh tonnes
in 2012, catches have showed a continuous decline
to less than 50000 t in 2019. This trend has adversely
affected the livelihoods of thousands of traditional
fishermen. Oceanographic changes associated with El
Niño has been identified as one of the reasons for this
decline in sardine catches along the Kerala coas
Deconstruction and Holography
It was recently pointed out that the physics of a single discrete
gravitational extra dimension exhibits a peculiar UV/IR connection relating the
UV scale to the radius of the effective extra dimension. Here we note that this
non-locality is a manifestation of holography, encoding the correct scaling of
the number of fundamental degrees of freedom of the UV theory. This in turn
relates the Wilsonian RG flow in the UV theory to the effective gravitational
dynamics in the extra dimension. The relevant holographic c-function is
determined by the expression for the holographic bound. Holography in this
context is a result of the requirements of unitarity and diffeomorphism
invariance. We comment on the relevance of this observation for the
cosmological constant problem.Comment: 11 pages, LaTe
Alpha-states in de Sitter space
Field theory in de Sitter space admits a one-parameter family of vacua
determined by a superselection parameter alpha. Of these vacua, the Euclidean
vacuum uniquely extrapolates to the vacuum of flat Minkowski space. States
which resemble the alpha-vacua can be constructed as excitations above the
Euclidean vacuum. Such states have modes alpha(k) which decay faster that
k^{(1-d)/2}. Fields in such states exhibit non-local correlations when examined
from the perspective of fields in the Euclidean vacuum. The dynamics of such
entangled states are fully consistent. If an alpha-state with properties that
interpolate between an alpha-vacuum and the Euclidean vacuum were the initial
condition for inflation, a signature for this may be found in a momentum
dependent correction to the inflationary power spectrum. The functional
formalism, which provides the tool for examining physics in an alpha-state,
extends to fields of other spin. In particular, the extension to spin-2 may
proffer a new class of infrared modifications to gravitational interactions.
The implications of superselection sectors for the landscape of string vacua
are briefly discussed.Comment: 28 pages, LaTe
The Library of Babel: On the origin of gravitational thermodynamics
We show that heavy pure states of gravity can appear to be mixed states to
almost all probes. For AdS_5 Schwarzschild black holes, our arguments are made
using the field theory dual to string theory in such spacetimes. Our results
follow from applying information theoretic notions to field theory operators
capable of describing very heavy states in gravity. For half-BPS states of the
theory which are incipient black holes, our account is exact: typical
microstates are described in gravity by a spacetime ``foam'', the precise
details of which are almost invisible to almost all probes. We show that
universal low-energy effective description of a foam of given global charges is
via certain singular spacetime geometries. When one of the specified charges is
the number of D-branes, the effective singular geometry is the half-BPS
``superstar''. We propose this as the general mechanism by which the effective
thermodynamic character of gravity emerges.Comment: LaTeX, 6 eps figures, uses young.sty and wick.sty; Version 2: typos
corrected, minor rewordings and clarifications, references adde
D-branes on Singularities: New Quivers from Old
In this paper we present simplifying techniques which allow one to compute
the quiver diagrams for various D-branes at (non-Abelian) orbifold
singularities with and without discrete torsion. The main idea behind the
construction is to take the orbifold of an orbifold. Many interesting discrete
groups fit into an exact sequence . As such, the orbifold
is easier to compute as and we present graphical rules which
allow fast computation given the quiver.Comment: 25 pages, 13 figures, LaTe
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