Bubble Induced Disruption of a Planar Solid-Liquid Interface During Controlled Directional Solidification in a Microgravity Environment

Pore Formation and Mobility Investigation (PFMI) experiments were conducted in the microgravity environment aboard the International Space Station with the intent of better understanding the role entrained porosity/bubbles play during controlled directional solidification. The planar interface in a slowing growing succinonitrile - 0.24 wt% water alloy was being observed when a nitrogen bubble traversed the mushy zone and remained at the solid-liquid interface. Breakdown of the interface to shallow cells subsequently occurred, and was later evaluated using down-linked data from a nearby thermocouple. These results and other detrimental effects due to the presence of bubbles during solidification processing in a microgravity environment are presented and discussed

Post-tsunami oceanographic conditions in southern Arabian Sea and Bay of Bengal

Physical oceanographic conditions along the east and west coasts of India immediately after the recent devastating tsunami are presented here. The thermocline in the southeast coast exhibited trivial downward tilt towards north. A mixed layer deepening (>50 m) associated with low-salinity ( 36.0 psu) was identified as the Arabian Sea high salinity water mass along the west coast of India around 100 m depth up to 10°N. The heat content changes closely followed similar changes in the depth of the 20°C isotherm. Turbidity measurements using light scattering sensor showed the existence of two layers of high-scattering, one around 40 m and the other around 250 m. The shallow high-scattering layer is associated with high chlorophyll a concentration, but the deeper high-scattering layer noticed at shallow stations off the west and east coasts of India may be due to the resuspension of the sea-floor sediments due to turbulence generated by the tsunami

Comparative Study of Selected Physical Components of Male Boxers, Wrestlers and Judokas

Most of the skill performances and execution of techniques in the sports such as boxing, wrestling and judo were based on the basic fitness components. The purpose of the study was to determine the existence of statistically significant difference on selected fitness components (speed, agility, power, flexibility and endurance) among boxers wrestlers and judokas. For this purpose, ninety sportsmen (30 boxers, 30 wrestlers, and 30 judokas) were selected. Their age ranged between 18 to 23 years. The selected variables were assessed using 50 metres dash, shuttle run, jump and reach, sit and reach, and Harward step test. The data was analyzed by applying ANOVA and Scheffe S post hoc test. The result showed that there were significant difference in all the selected physical fitness components among boxers, wrestlers and judokas. The boxers showed a better capability in speed, agility and power, while the wrestlers were better in endurance and the judokas with greater flexibility

Study on the Influence of Rapid Prototyping Parameters on Product Quality in 3D Printing

This work aims at evaluating the relative significance of the input parameters on the product quality produced by Z510 3DP rapid fabricator. Taguchi’s L18 orthogonal array was employed to investigate the possible process parameters including binder setting saturation value (shell & core), layer thickness, and build orientation. Using a surface profilometer and CMM, a series of measurements in evaluating the 3DP products surface finish and dimensional accuracy has been carried out. Nonlinear regression model was developed and a statistical analysis was done to determine the significant factors affecting the product quality of the fabricated products. Optimal process parameter settings were proposed using Particle Swarm Optimization technique. The results were validated by conducting the confirmatory experiments.Mechanical Engineerin

Studies on the infestation of an isopod crustacean, Cirolana fluviatilis in some parts of the Cochin backwaters, Kerala

In July 1994 reports appeared in the media about the large scale occurrence of a tiny 'antlike fish killer' in the Kumbalangi-Perumpadappu area of the Cochin backwaters causing threat to the aquatic living resources.The CMFRI initiated an investigation on the problems. The isopod C.Jluviatilis is a commonly occurring organism in the Cochin backwaters and elsewhere. It is a voracious carnivore which if present in very large numbers can cause a threat to the living resources in the estuarine water area. Population explosion of this isopod has now taken place in the Kumbalangi - Perumpadappu area. The reason for the unprecedented population explosion of this isopod in the Kumbalangi- Perumpadappu area is the recent changes taken place in the ecosystem there

भारत के दक्षिण-पशिचम तट के अष्टमुडी झील में अवसाद और पानी की गुणता के परिवेश में सीपी संस्तरों का निर्धारण

कृपया पूरा लेखा पढ

Effect of addition of SiC particles on the Microstructure and Hardness of Al-SiC composite

This work aims to investigate the effect of the addition of silicon carbide particles on the microstructure and the hardness of the Al-SiC metal matrix composites. The said composite is prepared using the stir casting technique for different weight percentages of the SiC particles. The higher composition of the reinforcement causes the clustering of the particles in the matrix. Thus, research has to be carried out on the aluminum-silicon carbide composites with the reinforcement 3wt%, 6wt%, 9wt%, and 12wt% of SiC particles to obtain the optimized composition. In order to study the microstructure and the reinforcement distribution in the matrix, a scanning electron microscope is utilized. The hardness testing has been carried out using the Vickers’ indentation technique for the as-cast and age hardening conditions. From the microstructural study, it is observed that the microstructure of the said composite exhibits the uniform distribution of the reinforcement. The EDX results show the presence of the reinforcing elements in the Al-SiC composite. From the results obtained from the hardness testing, it is observed that the presence of the carbide element in the composite increases the hardness of the Al-SiC particulate composites

HERBAGE AND ESSENTIAL OIL YIELD OF OCIMUM SPP. INTERCROPPED UNDER PONGAMIA PINNATA BASED SILVIMEDICINAL SYSTEMS IN GUJARAT, INDIA

Present investigation was carried out in ASPEE College of Horticulture and Forestry, Navsari Agricultural University, Navsari, Gujarat, India. Four Ocimum species namely O. sanctum, O. tenuiflorum, O. basilicum and O. gratissimum were intercropped under 2.5 years old Karanja (Pongamia pinnata) based agroforestry systems named as silvi-medicinal system (Pongamia+Ocimum spp.) and sole cropping system following Factorial Randomized Block Design with three replications. Significantly higher fresh above and below ground and total herbage and oil yield of Ocimum spp. was recorded under silvi-medicinal systems compared to sole cropping. Out of four Ocimum species, maximum values of fresh above ground (10.54 t/ha) and total herbage yield (12.05 t/ha) were attained by O. tenuiflorum. Whereas, maximum below ground fresh herbage yield (20.08 t/ha) was recorded for O. basilicum. Among intercrops, significantly maximum oil yield (61.32 kg/ha) was obtained for O. tenuiflorum. The findings suggested that higher fresh herbage and oil yield can be achieved under silvi-medicinal systems (Karanja + Ocimum spp.) compared to sole cropping

Development and characterization of biodegradable chitosan nanoparticles loaded with lovastatin using factorial design

The objective of the present work was to formulate chitosan nanoparticles as carriers for the lovastatin, since this drug undergoes extensive first pass extraction in the liver, and bioavailibity is low (< 5 %). Nanoparticles were prepared by modified ionotropic gelation method using 32 full factorial design. From the preliminary trials, the constraints for independent variables X1 (concentration of chitosan) and X2 (concentration of sodium tripolyphosphate) have been fixed and examined to investigate effect on particle size, encapsulation efficiency, zeta potential, % release, SEM, FTIR, XRD and DSC analysis of lovastatin. The diameter of prepared nanoparticles was controlled in the range of 100-800 nm, spherical shape and narrow diameter distribution. The release profiles of all batches were very well fitted by both the zero order model and the anomalous transport. These results indicate that lovastatin nanoparticles could be effective in sustaining drug release for a prolonged period.Colegio de Farmacéuticos de la Provincia de Buenos Aire