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Magnetic fluid based porous inclined slider bering with velocity slip

100%

Shah R. C. , Bhat R.

International Journal of Applied Mechanics and Engineering

2003

tom Vol. 8, no 2

331-336

A theoretical study was made of a porous inclined slider with a magnetic fluid as lubricant considering velocity slip. Expressions were obtained for pressure, load capacity, friction on the moving slider, the coefficient of friction and the position of the centre of pressure. Computed values showed that load capacity and friction decreased when the slip parameter increased. The coefficient of friction attains an optimum for a certain value of the slip parameter which affects a little the position of the centre of pressure.

A friction model of microbearings with thin metallic compliant coatings

80%

Stiharu I. , Bhat R. , Hong H.

International Journal of Applied Mechanics and Engineering

2003

tom Vol. 8, no 2

317-329

The paper presents experimental results of the investigation on the micro-tribological properties of Ti thin film layers deposited on metallic substrates of various hardness. The tests were carried out under standard dry friction conditions using a miniature pin on disk apparatus. The experimental results found for the friction coefficient developed between 52100 steel pin and Ti as a compliant layer deposited on various hardness substrates from soft to hard are consistent with other results presented in literature for the pair steel/Ti. A friction model that assumes the plowing of microasperities into the soft thin film layer supported by the elastic substrate as the main factor in the originating friction is further proposed. A simplified one-asperity model is assessed against the compliant layer assumed deposited on a rigid substrate. The analysis of the influence of the stress developed at the interface substrate-film is assumed in this model. Tests carried out qualitatively confirmed that the influence of the inter-laminar stress is significant to friction. Given the simplification assumptions, the proposed model exhibits reasonable agreement with the experimental results. It is further suggested that the lubrication of the hard surfaces with thin compliant metallic layers of Ti represents an alternative for the friction improvement in the small bearings belonging to miniature mechanical systems and the Micro-Electro-Mechanical Systems (MEMS).

Physio-chemical and antioxidant profiling of Salvia sclarea L. at different climates in north-western Himalayas

61%

Kaur T. , Bhat H. A. , Bhat R. , Kumar A. , Bindu K. , Koul S. , Vyas D.

Acta Physiologiae Plantarum

2015

tom 37

nr 07

Salvia sclarea Linn. commonly known as clary sage, is an important medicinal herb with high market demand. To assess properties suitable for commercial exploitation, physiological and biochemical studies were conducted at different climatic zones in the Western Himalayas. These include Jammu (subtropical; 305 m), Srinagar (temperate; 1730 m) and Leh (cold arid; 3505 m) environment. Antioxidant capacity based on radical scavenging and DNA protecting activity of the plants growing at three locations was found to be highest in Srinagar. The cellular damage in terms of lipid peroxidation was found significantly (p B 0.05) higher in Jammu as compared to Srinagar and Leh. SOD and GR showed significant (p B 0.05) differences between all three climatic zones. High expression of GR at higher altitudes is also corroborated by higher reduced state of glutathione. Significant (p B 0.05) increase in floral characteristics like inflorescence and spike length was observed at Leh. Chemical investigation of essential oil revealed the increased percentage of linalool and sclareol, two commercially important constituents, in Leh. 52.9 and 39.4 % increase was observed in the metabolic content of sclareol in Leh as compared to their values in Jammu and Srinagar, respectively. Higher floral biomass and qualitative increase in essential oil suggest that cold arid Himalayan region can be exploited for commercial cultivation of clary sage.