Vikram Sarabhai Space Centre

About: Vikram Sarabhai Space Centre is a facility organization based out in Thiruvananthapuram, India. It is known for research contribution in the topics: Aerosol & Ultimate tensile strength. The organization has 2092 authors who have published 3058 publications receiving 47975 citations. The organization is also known as: VSSC.

Adhesive Characteristics of Alder-Ene Adduct of Diallyl Bisphenol a Novolac and Bisphenol a Bismaleimide

Abstract: Diallyl bisphenol A–formaldehyde copolymer (ABPF) was addition cured with bisphenol A bismaleimide (BMIP) making use of the Alder-ene reaction at high temperatures. The lap shear strength (LSS) of the system was found to depend on the conditions of cure and the stoichiometry of the reactants. Moderate cross linking achieved at a 1:1 maleimide:allylphenol stoichiometry and a stepwise cure, up to a maximum of 250 °C for 2 h, was found to be the most effective in achieving the optimum LSS properties. The system exhibited greater than 100% retention of the LSS at temperatures up to 250 °C. Matrix modification using polysulfone (PS) and polycarbonate (PC) resulted in a remarkable improvement in the adhesive characteristics, although the high-temperature retention was marginally adversely affected. The performance advantage both at room temperature (RT) and at high temperature was greater in the case of PS modification, showing an optimum improvement at 20% loading as against PC modification, exhibiting maximum...

A Novel Biomass Derived Carbon Quantum Dots for Highly Sensitive and Selective Detection of Hydrazine

Abstract: We report for the first time, carbon quantum dots (CQD) based highly sensitive and selective electrochemical sensor for detection of hydrazine. CQD was synthesized by pyrolysis method using a natural precursor, chia seeds. The sensing ability was studied in terms of oxygen‐rich functional groups present on the surface of CQD.

Strengthening in high strength Cu-Cr-Zr-Ti alloy plates produced by hot rolling

Abstract: The aim of present investigation was to achieve different combination of strength and ductility in Cu-Cr-Zr-Ti alloy by multi-pass rolling in the temperature range of 500–800 °C. The hot rolled specimens were characterized for microstructure and mechanical properties by optical microscopy, transmission electron microscopy, and tensile testing. Specimens rolled in the aforementioned temperature range showed yield strength better than that of solution treated condition. Combination of high strength and good ductility was achieved by rolling at 500 °C with ultimate tensile strength, yield strength, and ductility of 349 MPa, 318 MPa, and 26% respectively. The superior strength achieved by rolling at 500 °C has been attributed to formation of fine chromium precipitates and high dislocation density.