STATISTICAL MODEL BASED OPTIMAL PREDICTION ON DRILLING PARAMETERS

The drilling is an imperative machining practice in the mechanical field for fitting or cutting the materials devoid of any disturbance. Various elements are basically employed within the automobile applications on account of the light weight, exceptional firmness and the moderate cheapness. The effectiveness of the drilled opening for the material shields is expanded by minimizing the eccentricity factor. The eccentricity is a degree of the nature of a drilled hole, and the process is based on input parameters. The significant intention of the suggested procedure is to built a mathematical modeling   with the support  of the optimization techniques. The mathematical modeling is done by minimizing the time consumed in the case of extension of the real time experiment. It is utilized to predict the diameter of the drill whole entry and exit, material removal rate and the eccentricity factor for the drilling process. Different optimization algorithms are utilized to find the optimal weights α and β of the mathematical modeling. All the optimum results demonstrate that the attained error values between the output of the experimental values and the predicted values are near equal to zero in the designed model. From the results, the minimum error 97.2% is determined by the mathematical modeling attained in the Artificial Fish Swarm Optimization (AFSO) process

Biology, Population and Exploitation of the Indian Deep-Sea Spiny Lobster, Puerulus sewelli Ramadan

The occurrence of the deep-sea spiny lobster or the whip lobster Puerulus sewelli Ramadan off Kerala coast and in the Gulf of Manner was reported as early as the turn of this centur

A good nursery ground for tiger prawns located in Kerala

The green tiger prawn Penaeus semisulcatus de Haan is one of the large growing species of penaeid prawns occurring in Indian waters. It grows to a maximum size of 250 mm and has been reported from all along the west and east coasts. The occurrence of juveniles in large numbers in Ashtamudi badcwaters would suggest that it is an ideal nursery ground for this species. In Cochin backwaters this species occurs during December to May/June when the salinity is high and in recent years there has been a steady increase in its abundance in the experimental as well as commercial catches. The copious existence of juvenile stages in these two major backwater systems indicate the possibility of the availability of a breeding stock of this species in the sea somewhere in the southern part of Kerala coast

A study on the prawns of Ashtamudi backwaters In Kerala with special reference to Penaeids

Fifteen species of prawns were recorded from Ashtamudi backwater system whicli included one species of sergesitid, five species of carideans and nine species of penaeids. The penaeid prawns were chiefly represented by juveniles of Penaeus semisulcatus, P., indicus, P. latisulcatus, Melapenaeus dobsoni and M. monoceros. While M dobsoni and P. indicus were the dominant species in most parts of the backwaters, P. semisulcatus occurred more abundantly in some of the deeper areas having relatively higher salinities (9.42-32.11% ). P. latisulcatus formed one of the common components of the catches taken during the post-monsoon period. Parapenaeopsis styltfera, the most dominant sepcies contributing to the marine fishery of this area, was encountered only in stray numbers. Commercial exploitation and population characteristics of the juvenile penaeid prawns in these nursery areas are briefly discussed

Prawn seed calendars of Cochin backwater

The paper presents a consolidated monthly picture of the availability of penaeid prawn seeds. In Cochin backwater (between Thoppumpady and Mulavukad) based on the results of routine monitoring studies carried out from 1967 to 1979, using plankton net, try net (miniature trawl) and velon screen drag net. The prawn seed population, comprising postlarval and early juvenile stages, is represented by thirteen species, of which, Metapenaeus dobsoni, M. affinis, M. monoceros, Penaeus indicus and P. semisulcatus are the most common. While M. dobsoni forms the chief constituent in the plankton collections (88 %) and try net catches (46%), P. indicus predominates in the velon screen drag nets (93 %) operated in shallow areas close to the shore. M. affinis occurs in greater abundance in the deeper areas as evidenced by its high percentage (45 %) in the try net catches. The environmental conditions of the backwater and the relative abundance and size distribution of the seeds of different species as represented in the three methods of collections are summarized month-wise. Although prawn seeds are available throughout the year, the peak seasons of important species are August-January for M. dobsoni, May-July for M. affinis, December-April for M. monoceros, March-May for P. indicus and January-March for P. semisulcatu

Design and Implementation of Improved Electronic Load Controller for Self-Excited Induction Generator for Rural Electrification

This paper offers an alternative technique, namely, Improved Electronic Load Controller (IELC), which is proposal to improve power quality, maintaining voltage at frequency desired level for rural electrification. The design and development of IELC are considered as microhydroenergy system. The proposed work aims to concentrate on the new schemes for rural electrification with the help of different kinds of hybrid energy systems. The objective of the proposed scheme is to maintain the speed of generation against fluctuating rural demand. The Electronic Load Controller (ELC) is used to connect and disconnect the dump load during the operation of the system, and which absorbs the load when consumer are not in active will enhance the lifestyle of the rural population and improve the living standards. Hydroelectricity is a promising option for electrification of remote villages in India. The conventional methods are not suitable to act as standalone system. Hence, the designing of a proper ELC is essential. The improved electronic load control performance tested with simulation at validated through hardware setup

Crustacean resources of the Lakshadweep islands

Information on the crustacean resources of Lakshadweep is limited to only a few faunistic reports on crabs, prawns, lobsters and stomatopods (Alcock, 1895, 1896, 1998, 1899, 1900; Borradaile, 19C3a, 1903b, 1903c, 1903d, 19o6a, 1906b; Sankarankutty, 196); Thomas 1970a, 1970b, Meiyappan and Kathirvel, 1978; Piilai era/, 1984 and Shanbhogue, 1986) A total of 132 species of brachyuran crabs mostly belonging to Calappidae, Majidae, Parthenopidae, Portunidae, Xanthidae, Ocypodidae and Grapsidae, 4 species of palinurid lobsters, 2 species of scyllarid lobsters, 6 species of penaeid prawns and 7 species of stomatopods have been recorded so far from these islands

Energy conversion in the prawn Metapenaeus dobsoni (Miers) fed on artificial feed

Measured quantities of feed containing 33.33% by weight of tapioca powder, 16.67% of rice bran, 41.67% of fishmeal and 8.33% of mineral supplements (Starmin PS), made into pellets, using agar-agar as binding agent, were fed to Metapenaeiis dobsoni. Mean gross and net conversion (growth) efficiencies, Ki and : 2. were; 39.62% and 49.34%. Average assimilation efHciency was of the order 80.99%