Development of a co-cured composite torque shaft for rudder of high speed aircraft

The Carbon Fibre reinforced Composites are widely used in developing various composite parts of civil and13; military aircraft due to its high specific strength and specific stiffness. Rudder being a primary control surface in an aircraft, it is subjected to various loads and needs high degree of structural integrity. Usually rudders are made of metal with many fasteners. In NAL we have designed and developed a composite rudder. Specialty of this13; rudder is that it has a torque shaft made up of carbon composite and has only few rivets. Conventionally torque13; shaft s are made up of special metals like titanium. The objective of this paper is to highlight the development of13; various tooling techniques used to fabricate the composite torque shaft . All major parts of the torque shaft are13; made by Co-curing technique and the metal attachments are embedded to the composite parts by self locking13; mechanism design. To qualify the torque shaft fatigue tests are done and ageing studies performed to prove13; structural integrity of the torque shaft under extreme environmental conditions. This paper portrays the13; development efforts, tolling and fabrication approaches for successful realization of the CFRP Torque Shaft

Mechanism of Oxidation of Ascorbic Acid by N-Chlorobenzamide

482-48

Kinetics of Oxidation of Hydrazine & Hydroxylamine by N-Chlorobenzamide

713-71

Polarographic Study of Cd(II) & Pb(II) Complexes of Tris-(hydroxymethyl)- aminomethane in Water & Aqeuous Methanolic Solutions

716-71

A study of anaemia and its correlates among adolescent girls in schools of Haldwani, India

Background: Anaemia, a manifestation of under nutrition and poor dietary intake of iron is a public health problem, not only among pregnant women, infants and young children but also among adolescents. Anaemia among adolescent girls can result in impaired physical growth, poor cognition, reduced physical fitness and work performance and lower concentration on daily tasks.Methods: A cross-sectional descriptive study was carried out in schools of Haldwani, Uttarakhand, India with the objective studying various socio-demographic characteristics in relation to anaemia among adolescent girls. Multistage random sampling was used to select adolescent girls of 10 to 19 years of age who were interviewed and examined. Statistical analysis was done using Chi-square test and Odds ratios calculated with SPSS v21.Results: Around 371 girls in present study had varying severity of anaemia and majority had mild to moderate anaemia. Place of residence, type of school, birth order, type of family and mother occupation were significantly associated with presence of anaemia. Girls taking mixed diet were 1.23 times more likely to be non-anaemic as compared to girls taking vegetarian diet. Study showed adolescent girls consuming IFA tablets were less likely anaemic compared to those not consuming (OR=0.09, p<0.001).Conclusions: Among school going adolescent girls nearly half are still suffering from anaemia in India, despite the efforts of government and it is still a challenging public health problem