Cellularity of Wreath Product Algebras and AA--Brauer algebras

A cellular algebra is called cyclic cellular if all cell modules are cyclic. Most important examples of cellular algebras appearing in representation theory are in fact cyclic cellular. We prove that if $A$ is a cyclic cellular algebra, then the wreath product of $A$ with the symmetric group on $n$ letters is also cyclic cellular. We also introduce $A$--Brauer algebras, for algebras $A$ with an involution and trace. This class of algebras includes, in particular, $G$--Brauer algebras for non-abelian groups $G$. We prove that if $A$ is cyclic cellular then the $A$--Brauer algebras $D_n(A)$ are also cyclic cellular

Comparison Of Modified Dual Ternary Indexing And Multi-Key Hashing Algorithms For Music Information Retrieval

In this work we have compared two indexing algorithms that have been used to index and retrieve Carnatic music songs. We have compared a modified algorithm of the Dual ternary indexing algorithm for music indexing and retrieval with the multi-key hashing indexing algorithm proposed by us. The modification in the dual ternary algorithm was essential to handle variable length query phrase and to accommodate features specific to Carnatic music. The dual ternary indexing algorithm is adapted for Carnatic music by segmenting using the segmentation technique for Carnatic music. The dual ternary algorithm is compared with the multi-key hashing algorithm designed by us for indexing and retrieval in which features like MFCC, spectral flux, melody string and spectral centroid are used as features for indexing data into a hash table. The way in which collision resolution was handled by this hash table is different than the normal hash table approaches. It was observed that multi-key hashing based retrieval had a lesser time complexity than dual-ternary based indexing The algorithms were also compared for their precision and recall in which multi-key hashing had a better recall than modified dual ternary indexing for the sample data considered.Comment: 11 pages, 5 figure

Structural Behavior of Non-Oxide Perovskite Superconductor MgCNi3_{3} at Pressures up to 32 GPa

We report the pressure dependence of the structural parameters of the non-oxide perovskite superconductor MgCNi$_{3}$ up to 32 GPa using a diamond anvil cell and synchrotron x-rays at room temperature. The structure of the compound remains in the Pm-3m cubic symmetry throughout the pressure range. The bulk modulus $B_{0}=156.9\pm0.2$GPa with $B_{0}^{\prime}=9.8$obtained by fitting the pressure-volume data is in good agreement with theoretical calculations reported earlier. An anomalous shift of the (111) and (200) lines observed above 9 GPa indicates a possible local short range distortion that is consistent with earlier studies.Comment: 9 Pages, 3 Figures, 1 Tabl

Re-occurrence of oilfish in the landings of the south-west coast of India

On 29.08.2008, 13 specimens of the oilfish, Ruvettus pretiosus Cocco, 1833 were recorded in the trawl landings along with a heavy catch of around 200 t of Coryphaena sp. at the Cochin fisheries harbour. The biggest specimen was 360 mm in TL with a weight of 260 g. The available literature indicates that a single specimen of R. pretiosus measuring 310 mm in TL and weighing 220 g collected from the continental slope off the Quilon Bank (09004'N lat. 75031'E long.) area during November 1968 is so far the only record from the south-west coast of India, besides the two specimens from Laccadives kept in the repository of the museum of Fisheries department at Kavarathi Island. The flesh of R. pretiosus contains more oil and hence the name oilfish. The only other gempylids recorded from the Cochin area earlier were Neoepinnula orientalis and Rexea prometheoides

Distribution and abundance of cladocerans in the eastern Arabian Sea

Of the two species, Penilia avirostris Dana and Evadne tergestina Claus encountered, 86% of the population of the former occurred within the 50 m depth zone and 75% of the total population of the latter in the 50 m-100 m depth zone. Striking day-night variations in the population densities of Penilia and Evadne were observed. The samples collected at night contained 99.7% and 88% of the populations of the former and latter species respectively. Swarming of Evadne and Penilia is a regular phenomenon during the southwest monsoon season.The highest concentration of the former species was observed in August and that of the latter in September. High concentrations of Penilia and Evadne were observed in the 30 m depth zone off Cochin and in the 40 m depth zone off Karwar. The abundance of Penilia observed in the 30 m depth zone of Wadge Bank off Cape Comorin coincided with its maximum recorded in August off Cochin. The length frequency studies on Penilia and Evadne showed that different size classes dominated in the different regions from 07°N to 19°N and that an increase in size of the individuals was evident from south to north in both Penilia and Evadne. Fecundity of Penilia was the highest in the southernmost region between 07°00'N and 09°00'N while that of Evadne was in the northern region, 15°N- 19°N. Gamogenetic females of both Penilia and Evadne were very few in number. Occurrence of large numbers of parthenogenetic females of Penilia and Evadne with well developed advanced embroys in their brood pouches in the night samples probably suggest nocturnal brood maturation

Quantitative abundance of amphipods around Andaman-Nicobar Islands

The present study deals with the quantitative distribution and abundance of amphipods of the Andaman Sea in time and space, based on the zooplankton samples collected during the cruises 46- 73 of FORV Sagar Sampada during 1988-1990. Mean number of amphipods (no/1000 m ) reached the maximum of 1763 in January and the minimum of 315 in July. The seasonal density was maximum during the northeast monsoon and minimum for the southwest monsoon and their mean numbers were estimated as 812 and 463/1000 m respectively. In general, they were abundant in the region where the station depths ranged between 50 and 100 m with the mean estimated as 800/1000 m of water. Analysis of day and night samples did not show any remarkable variation. The distribution and abundance of amphipods in relation to time and space are discussed in the paper