Partial survey and critique of Ceylon's marine fisheries, 1953-55

This is a resume of a 1953-1955 study of Ceylon's fishing gears, fisheries and records of experimental and commercial fishing operations. Representative catches of edible fish per unit of effort for several of the gears studied are summarized in the table. They are low compared with many countries, indicating low abundance of fish.

Switching speed enhancement of the LDMOSFETs using partial-SOI technology

To overcome reduced breakdown voltage and self-heating effects inherent in silicon-on-insulator (SOI) power integrated circuits while still maintaining good isolation between low power CMOS circuits and the high power cells, partial SOI (PSOI) technology has been proposed. PSOI devices make use of both buried oxide and substrate depletion to support the breakdown voltage. 2D analyses and modeling of parasitic capacitances in PSOI structures show that PSOI-lightly doped MOSFETs can increase the switching speed by as much as four times compared to conventional SOI structures, making them very attractive for high switching applications.

Crystal growth of melt-textured Nd-123 under 1% oxygen partial pressure atmosphere

Crystal growth of melt-textured Nd-123 pseudo-crystals was investigated via an isothermal solidification with top-seeding technique under a 1%O2 in N2 atmosphere. Non-steady state solidification was observed at low undercooling, in contrast to an almost linear growth at higher undercooling. Similar to processing in air, the substitution of Nd/Ba was found to decrease from the seed position to the edge of the crystal. In addition, the volume fraction of Nd-422 particles decreased in the solid as solidification proceeded. As a result of these microstructural inhomogeneities, the critical temperature and the critical current density varied within the crystal even for samples processed isothermally, despite the narrow solid solution range of the Nd-123 phase under a reduced pO2 atmosphere.

Partial replacement of fishmeal protein by soybean meal protein in the diet of mrigal, Cirrhinus cirrhosus (Ham.) fry

To find out a suitable balance diet for Cirrhinus. cirrhosus fry substituting fish meal protein by full-fat soybean meal protein as dietary protein source for C. cirrhosus fry (1.29g) was studied in 12 aquaria for 60 days. The fishes were fed with four iso-nitrogenous (30% protein) and iso-caloric experimental diets viz. diet 1 (100% fish meal protein), diet 2 (75% fishmeal protein and 25% soybean meal protein), diet 3 (50% fishmeal protein and 50% soybean meal protein) and diet 4 (25% fish meal protein and 75% soybean meal protein). Among the diets the best growth, FCR and PER were obtained with diet 3 fed fishes and no significant difference (p<0.05) was observed between diet 1 and 2 and diet 4 offered the worst performance. Therefore, considering fish growth, FCR and PER, it can be suggested that fish meal protein might be replaced 50% by soybean meal protein in the diet of C. cirrhosus fry for better growth.