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.

A new perspective on MST radar observations of stratospheric intrusions into-troposphere associated with tropical cyclone

Abstract: [1] This paper presents the first ever evidence of stratospheric intrusion into troposphere during the passage of tropical cyclone using mesosphere-stratosphere-troposphere (MST) radar located at Gadanki (135°N, 792°E) The most significant and new observation is the enhanced signal-to-noise ratio (SNR) of thickness ∼1 km, extended from 16–13 km, when the cyclone is located close to the radar site Small-scale turbulence and strong downdraft followed by weak updraft are also observed from spectral-width and vertical velocity, respectively Further analysis of global data shows low out-going long wave radiation (<170 W m−2), low tropopause temperature (<191 K), enhanced potential vorticity (∼1 PVU) in the upper/middle troposphere, and low specific humidity (∼2 × 10−4 kg/kg) at 300 hPa pressure level, occurs over the radar site These observations clearly indicate the evidence of stratospheric intrusion into troposphere during the passage of tropical cyclone The results are presented and discussed in the light of present understanding

Nonlinear vibrations of thick plates using mindlin plate elements

Abstract: Large amplitude vibrations of Mindlin plates are studies using Lagrangian, isoparametric, quadrilateral elements with selective integration. Square, rectangular, circular and elliptical plates with clamped and simply supported boundary conditions are considered.

Observations of the atmospheric surface layer parameters over a semi arid region during the solar eclipse of August 11th, 1999

Abstract: This paper discusses the observations of the Atmospheric Surface Layer (ASL) parameters during the solar eclipse of August 11th, 1999. Intensive surface layer experiments were conducted at Ahmedabad (23‡21′N, 72‡36′E), the western part of India, which was close to the totality path. This rare event provided by nature is utilised to document the surface layer effects during the eclipse period using measurements of high frequency fluctuations of temperature, tri-axial wind components as well as mean parameters such as temperature, humidity, wind speed and subsoil temperature. Analysis showed that during the eclipse period, the turbulence parameters were affected leading to the suppression of the turbulence process, the main dynamic process in the atmospheric boundary layer, while the mean parameters showed variations within the natural variability of the observational period. The spectra of the wind components and temperature indicated decrease in spectral power by one order in magnitude during the eclipse period. The rate of dissipation of turbulent kinetic energy is found to decrease by more than one order during the eclipse period. The stability parameter showed a change from unstable to stable condition during the period of eclipse and back to unstable condition by the end of eclipse

High glass-transition polyurethane-carbon black electro-active shape memory nanocomposite for aerospace systems

Abstract: Carbon black conductive filler material, 2–40% by weight was added to specially designed polyurethane polymer to prepare shape memory polymer nanocomposites. The synthesised polyurethane (PU) has e...