Cage Farming of Cobia Rachycentron canadum

Cobia has gained popularity as a good candidate for mariculture due to its rapid growth and white meat of versatile use. It is considered as one of the most promising candidates for warm-water marine fish aquaculture in the world. Being the only member of the family Rachycentridae, it is found in the warm, temperate to tropical waters of the West and East Atlantic, throughout the Caribbean and in the Indo-Pacific off India, Australia and Japan. To date, research and development of cobia aquaculture has been initiated in over 23 countries and territories

प्रजाति विविधीकरण – तटीय जलकृषि में स्थिरता सुनिश्चित करने का उपाय

कृपया पूरा लेखा पढ

Age-Acknowledging Reliable Multiplier Design with Adaptive Hold Logic

Digital multipliers are among the most critical arithmetic functional units. The overall performance of these systems depends on the throughput of the multiplier. Meanwhile, the negative bias temperature instability effect occurs when a pMOS transistor is under negative bias (Vgs = −Vdd), increasing the threshold voltage of the pMOS transistor, and reducing multiplier speed. A similar phenomenon, positive bias temperature instability, occurs when an nMOS transistor is under positive bias. Both effects degrade transistor speed, and in the long term, the system may fail due to timing violations. Therefore, it is important to design reliable high performance multipliers. In this paper, we propose an aging-aware multiplier design with novel adaptive hold logic (AHL) circuit. The multiplier is able to provide higher throughput through the variable latency and can adjust the AHL circuit to mitigate performance degradation that is due to the aging effect. Moreover, the proposed architecture can be applied to a column- or row-bypassing multiplier. The experimental results show that our proposed architecture with 16 ×16 and 32 ×32 column-bypassing multipliers can attain up to 62.88% and 76.28% performance improvement, respectively, compared with 16×16 and 32×32 fixed-latency column-bypassing multipliers. Furthermore, our proposed architecture with 16 × 16 and 32 × 32 row-bypassing multipliers can achieve up to 80.17% and 69.40% performance improvement as compared with 16×16 and 32 × 32 fixed-latency row-bypassing multipliers

Farming of Silver Pompano Trachinotus blochii in coastal aquaculture ponds

The Central Marine Fisheries Research Institute has initiated aquaculture research on pompano from 2008 and the first successful broodstock development, induced breeding and larval production was achieved in 2011. Following the successful seed production of silver pompano, demonstration of farming in brackishwater ponds was initiated by the CMFRI to popularize among the farmers about its suitability for aquaculture. The first farming demonstration from the hatchery produced seed was carried out in a coastal aquaculture pond at Anthervedi Village, East Godavari District, Andhra Pradesh. It has been proven that silver pompano can be cultured in the brackishwater shrimp culture ponds as an alternative species with high survival rate, appreciable FCR and meat quality. These fishes have attained an average weight of 450 grams in 240 days (8 months). Based on the experience gained on the brackishwater farming of silver pompano, the practices to be adopted for pompano farming are narrated

Microstructure and Interfacial Reactions During Vacuum Brazing of Stainless Steel to Titanium Using Ag-28 pct Cu Alloy

Microstructural evolution and interfacial reactions during vacuum brazing of grade-2 Ti and 304L-type stainless steel (SS) using eutectic alloy Ag-28 wt pct Cu were investigated. A thin Ni-depleted zone of α -Fe(Cr, Ni) solid solution formed on the SS-side of the braze zone (BZ). Cu from the braze alloy, in combination with the dissolved Fe and Ti from the base materials, formed a layer of ternary compound τ2, adjacent to Ti in the BZ. In addition, four binary intermetallic compounds, Cu3Ti2, Cu4Ti3, CuTi and CuTi2 formed as parallel contiguous layers in the BZ. The unreacted Ag solidified as islands within the layers of Cu3Ti2 and Cu4Ti3. Formation of an amorphous phase at certain locations in the BZ could be revealed. The β -Ti(Cu) layer, formed due to diffusion of Cu into Ti-based material, transformed to an α -Ti + CuTi2eutectoid with lamellar morphology. Tensile test showed that the brazed joints had strength of 112 MPa and failed at the BZ. The possible sequence of events that led to the final microstructure and the mode of failure of these joints were delineated

Synthesis and characterization of pH-sensitive thiol-containing chitosan beads for controlled drug delivery applications

The aim of this study was to develop chitosan-based materials in drug delivery systems possessing covalent attachment of thiol moieties. Thiol-containing chitosan (TCS), found to be soluble in water, was synthesized by graft copolymerization technique. The TCS beads were prepared by using tripolyphoshate, at pH 4.0. The morphology of TCS beads was examined by scanning electron microscopy. The in vitro drug release behavior was studied in phosphate buffer solution at various pH, using indomethacin as a model drug at two different concentrations (0.3 and 0.6% w/w). The release amounts of indomethacin from TCS beads were higher increasing pHs in the dissolution medium. The release rate of indomethacin at pH 7.4 was higher than the release rate at pH 1.4 due to ionization of thiol groups and high solubility of indomethacin in an alkaline medium. These results indicated that the TCS beads may become a delivery system for the controlled release of different drugs wherever pH sensitive mechanics might be useful. This is especially applicable in cases when it is important to minimize drug release in acidic sites, such as in the stomach

Compensation of Voltage Sag and Swell Using SMES Based Dynamic Voltage Restorer

 Conducting Magnetic Energy Storage (SMES) is portrayed by profoundly proficient vitality storage. It has fast reaction and power controllability and is relied upon to add to brilliant intensity of the power grid. SMES innovation can possibly bring genuine power storage trademark and furthermore high power and vitality thickness for momentary reaction. This normal for SMES used to shield buyers from the network voltage variances like sag, swell and interference. This paper examinations the activity guideline of the SMES based DVR and its structure depends on basic PI control technique to repay voltage droops, swell and intrusion. Utilizing MATLAB/SIMULINK, the models of the SMES based DVR is set up, and the re-enactment tests are performed to assess the grid disturbances

Marine fish hatchery concept, design and construction

A marine fish hatchery is a complex system consisting various units like seawater intake, water treatment and storage, broodstock holding, indoor algal stock culture, intermediary and outdoor algal culture, rotifer culture, artemia hatching and enrichment, larviculture, nursery rearing, laboratory, feed and chemical storage, aeration facility, waste water treatment and disposal, workshop and staff accommodation area. During the production season proper hatchery management requires specialised skills and total dedication by well-trained personnel. Therefore, proper designing of a fish hatchery will give technical solutions to give best results in terms of convenience, ease of use, effective use of the full production capacity, bio-security, hygienic working conditions and cost effectiveness. Improper designing of the hatchery or construction would result in the risk of ineffective utilization of the facilities, uneconomical operation, increased manpower to manage the facility, chances of cross contamination, loss of stock etc

Rachycentron canadum (Linnaeus, 1766)

Cobia has an elongated fusiform (spindle-shaped) body and a broad, flattened head. Eyes are small and the lower jaw projects slightly past the upper. Fibrous villiform teeth line the jaws, the tongue, and the roof of mouth. Body of the fish is smooth with small scales. It is dark brown in colour, grading to white on the belly with two darker brown horizontal bands on the flanks. The stripes are more prominent during spawning, when they darken and the background colour lightens. The large pectoral fins are normally carried horizontally