Bidirectional three port converter for power flow management of PV/Battery-Fed elevator system

The Bidirectional Three Port Converter (BTPC) proposed in this research work is addressed for an elevator application that is driven from a BLDC motor in all four quadrants sourced from solar Photovoltaic (PV). The converter design of a PV based system necessitates constant output voltage with high power density and efficiency. The Proposed BTPC tracks the maximum power, maintains constant output voltage and also deals with the bidirectional power flow management whenever there is a change in applied torque when the machine is switched from motoring to regenerating mode. Furthermore, single stage power conversion is achieved with power transfer from PV to dc link or battery to dc link based on the load requirement and surplus power is directly stored in the battery. Closed loop control ensures adjusting the duty cycle of the proposed converter switches thereby maintaining the bidirectional power flow management. The proposed converter is analysed in detail with operating principle, design considerations and verified in terms of simulation and through experimental results

XANTHINE OXIDASE INHIBITORY ACTIVITY OF RHUS MYSORENSIS LEAVES

Objective: The objective of this study was to assess the in vitro xanthine oxidase (XO) inhibiting activity of the methanolic leaf extract of the Rhusmysorensis.Methods: Uric acid is synthesized in the presence of XO which is an essential enzyme. Various concentrations of the leaf extract were taken. XO inhibiting activity was spectrophotometrically assayed. By increasing absorbance at 295 nm, the degree of enzyme spontaneity was determined.Results: Inhibition concentration 50 (IC50) of the methanolic extract of R. mysorensis leaves was 45.24±0.34 μg/ml, compared with IC50 value of the standard allopurinol of 7.8±1.28 μg/ml.Conclusion: Methanol extract of R. mysorensis can be used to treat hyperuricemia and gout after proper preclinical and clinical studies

Effects of algal and animal food combinations on surfacing activity and food utilization in the climbing perch Anabas scandens

A. scandens was fed on five different combinations of the alga Spirogyra maxima and goat-liver. With increasing liver supplementation, the following increases were noted: consumption of food from 31 to 152 cal/g live fish•day, assimilation efficiency from 88 to 98%, production rate from 1.5 to 45.5 cal/g. day and the ef'fu;:iency from 5 to 17%. For culturing A. scandens, supplementation of algal food up to 22% is recommended. To exchange atmospheric air, A. scandens surfaced 432 and 1296 times/day, when fed on 100% S. maxima and 1OO% liver, respectively. The period of elevated surfacing frequency observed in the fish following a meal wa liver-fed individuals

Effects of algal and animal food combinations on surfacing activity and food utilization in the climbing perch Anabas scandens

A. scandens was fed on five different combinations of the alga Spirogyra maxima and goat-liver. With increasing liver supplementation, the following increases were noted: consumption of food from 31 to 152 cal/g live fish•day, assimilation efficiency from 88 to 98%, production rate from 1.5 to 45.5 cal/g. day and the ef'fu;:iency from 5 to 17%

Marine Fisheries Policy Brief-1 Kerala

Kerala which has a coastline of 590 km ranks first in marine fish production of India, contributing nearly 25% (5.81 lakh tonnes on average) to the total annual production. The export of marine products from the State earns valuable foreign exchange besides affording innumerable job opportunities in the industry. The population depending on fisheries has steadily increased over the years and stood at 6,02,234 in 2005 (Anon., 2005). Kerala has been in the forefront of absorbing innovative and new technologies in fishing practices, which have led the marine fisheries sector to take a complex structure. The 1980s was an important period in the development of marine fisheries in Kerala. In the first half of the period the motorized sector grew rapidly and became the most important sector yielding the maximum catch in 1988. By that time, ringseine became very popular in exploiting the pelagic resources and replaced the boatseines to a very great extent. Huge size of the new net (450 to 1000 m long) and large number of crew (30 to 50) needed for its operation necessitated larger boats with high capacity outboard engines (3 outboard engines of 40 hp each). This facilitated extension of fishing grounds for the motorized sector. The fishing grounds covered by the mechanised sector also extended by increasing the boat size and fishing effort and efficiency through multi-day fishing during the late 90s

Marine Fisheries Policy Brief-1 സമുദ്ര മത്സ്യമേഖലാ നയ പരിപ്രേക്‌ഷ്യം - 1 കേരളം (Marine Fisheries Policy Brief-1 Kerala Malayalam version)

Marine Fisheries Policy Brief-1 സമുദ്ര മത്സ്യമേഖലാ നയ പരിപ്രേക്‌ഷ്യം - 1 കേരളം (Marine Fisheries Policy Brief-1 Kerala Malayalam version

Marine Fisheries Policy Brief-2; Seasonal Fishing Ban

Fishery resources need to be monitored and managed to maintain harvest at sustainable levels as they provide food and livelihood security to millions of population. Management of fisheries is not confined to management of stocks alone but it should consider all the stakeholders associated with the sector directly or indirectly such as fishers, traders, those involved in post-harvest operations and those who provide support services to the sector. Besides, fish stocks live in a highly variable and a complex ecosystem and are affected by human interventions and vagaries of nature, which emphasises the need for including the risk and uncertainty factors in the management strategie

Threadfin bream fishery and biology of Nemipterus japonicus off Veraval

The annual average threadfin bream landings from 50 252 trawl units was 1 928.5 tonnes in Veraval during April 1S87 — March 1990. The catch per unit effort was high during December - March. Nemipterus japonicus, whi:h formed 82.6% of the threadfin bream landings, matured at 180 mm total length. The von Bertalanffy growth parameters were K = 0.733, t„ = - 0.1167 and L_ = 337 mm. N. japonicus preferred to feed on crustaceans especially Aceles spp

Estimated biomass of demersal flshes off Saurashtra coast

Analyiis of exploratory tiawl lurvey data for the areas between latitudes 20°N (off Veraval) and 23°2(m ( (^ Jaldiau) and longitudes 68°E and 70°S0^ in the Saurashtra coast for a S-year period from 198S to 1989 revealed that the average demersal fish biomass in this area w u 430.4 kg/km^ The biomass per unit area increased in the north western direction from Veraval up to Harshad. Sdaenid and riUxMifish contributed substantially to the resource, forming as high as 62.5% of total demersal biomass. During the S-year period, the dianersel biomass declined from 634.7 kg/km^ in 198S to 3SS.0 kg/km^ in 1989, i.e. a decrease of abcwt 44%

Marine fish calendar. VII. Madras

The Marine fish landing details during the period 1981-1985 for Madras is presented in this article. Kasimode centre, the only base where the mechanised boats as well as country crafts were in use was used for preparing the fish calandar. Catch details of other miscellaneous groups like catfish, Polynemus, Chirocentrus and crustaceans and cephalopods are not incorporated in this calendar. The monthwise pooled CPUE of trawlers, mechanised gill nets and indigenous gears and the monthwise species composition of fish groups are illustrated