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G. Shanmugavelayutham,V. Selvarajan,P.V.A. Padmanabhan,K.P. Sreekumar,N.K. Joshi 한국물리학회 2007 Current Applied Physics Vol.7 No.2
A DC non-transferred mode plasma spray torch was fabricated for plasma spheroidization. The eect of powder-carrier gas and pow-der loading on the temperature of the plasma jet generated by the torch has been studied. The experiment was done at dierent inputparticles in the size range from 40 to 100l m were processed. The temperature of the jet was estimated after owing powder-carrier gasonly into the plasma jet and with powder-carrier gas feeding powder into the ame. On introduction of powder-carrier gas and powderloading the temperature of the jet was found to decrease appreciably down to 11%. The temperature of the plasma jet was estimatedusing the Atomic Boltzmann plot method.
Dutta, Sudhir K.,Agrawal, Kireet,Girotra, Mohit,Fleisher, A. Steven,Motevalli, Mahnaz,Mah'moud, Mitchell A.,Nair, Padmanabhan P. Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.12
Introduction: Epidemiological studies suggest a protective role for ${\beta}$-carotene with several malignancies. Esophageal adenocarcinoma frequently arises from Barrett's esophagus (BE). We postulated that ${\beta}$-carotene therapy maybe protective in BE. Materials and Method: We conducted a prospective study in which 25 mg of ${\beta}$-carotene was administered daily for six-months to six patients. Each patient underwent upper endoscopy before and after therapy and multiple mucosal biopsies were obtained. Additionally, patients completed a gastroesophageal reflux disease (GERD) symptoms questionnaire before and after therapy and severity score was calculated. To study the effect of ${\beta}$-carotene at molecular level, tissue extracts of the esophageal mucosal biopsy were subjected to assessment of heat-shock protein 70 (HSP70). Results: A significant (p<0.05) reduction in mean GERD symptoms severity score from $7.0{\pm}2.4$ to $2.7{\pm}1.7$ following ${\beta}$-carotene therapy was noted. Measurement of Barrett's segment also revealed a significant reduction in mean length after therapy. In fact, two patients had complete disappearance of intestinal metaplasia. Furthermore, marked enhancement of HSP70 expression was demonstrated in biopsy specimens from Barrett's epithelium in four cases that were tested. Conclusions: Long-term ${\beta}$-carotene therapy realizes amelioration of GERD symptoms along with restitution of the histological and molecular changes in esophageal mucosa of patients with BE, associated with concurrent increase in mucosal HSP70 expression.
V. Babu,Balasivanandha Prabu Shanmugavel,K. A. Padmanabhan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
The influence of working temperature and number of passes on the mechanical properties of aluminium alloy, AA 5083,processed by cyclic expansion and extrusion (CEE) is discussed. The specimens were processed up-to 10 CEE passes at200 °C, 300 °C and 400 °C. The average grain size of the starting annealed material was 84.5 ± 6.8 μm, with 39.4% beingof the high-angle grain boundaries (HAGBs) type. After 8 CEE passes at 200 °C the material had an average grain size of3.3 ± 0.6 μm and 41.3% of the grain boundaries were of the high-angle type (HAGBs). The combined effect of an increasein dislocation density and reduction in grain size as a result of CEE processing contributed to an increase in hardness andstrength of the alloy. At 200 °C, the specimen exhibited uniform hardness values with a maximum improvement of 104% after8 passes and the ultimate tensile strength had also increased by 64% compared with the unprocessed condition. However,the mechanical properties decreased in the specimens that were processed at the higher temperatures of 300 °C and 400 °C.
In-flight particle behaviour and its effect on co-spraying of alumina?titania
G. Shanmugavelayutham,V. Selvarajan,T.K. Thiyagarajan,P.V.A. Padmanabhan,K.P. Sreekumar,R.U. Satpute Y. Zhai 한국물리학회 2006 Current Applied Physics Vol.6 No.1
The present paper investigate and illustrate the importance of plasmaparticle interaction in controlling the plasma spray processwhile spraying aluminatitania powder blend. Plasma sprayed coatings of aluminatitania (6040l m) have been prepared at dier-chemical composition of aluminatitania coatings, prepared at low input power, is signicantly dierent from that of the feed stockpowder. Coating composition progressively approaches that of the feedstock powder at higher power inputs. Experimental resultsare explained in terms of the in-ight behaviour of alumina and titania particles in the plasma jet using a one-dimensional model topredict the thermal state of the particles. In particular, the eect of particle size and input power are considered in this study.
V. Babu,Balasivanandha Prabu Shanmugavel,K. A. Padmanabhan 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.10
The influence of the semi-die angle (α = 45°, 30° and 22.5°employed in the present experiments) of the cyclic expansion extrusion (CEE) process on grain refinement in Al-alloy AA 6063 processed at 100°C at a pressing velocity of 0.5 mm.s− 1 and subjected to different number of passes is examined. The strain imparted on the specimen strongly depends on the die geometry. Grain refinement as well as increase in the ultimate tensile strength and micro-hardness after 10 CEE passes is the highest when the semi-die angle (α) is 22.5°. TEM images reveal the formation of fine grains after 10 CEE passes. Dislocation generation and cell formation directly depend on the strain imparted and the interactions between the dislocations and the Mg2Si precipitates. The tensile strength and hardness of the CEE processed specimens were compared as a function of the semi-die angle (α) and the results were compared with those of the unprocessed alloy also.