Sonic boom as possible mechanism of the low‐frequency hum

Indoor Sonic Boom Reproduction Using ANC

ABSTRACT The European programs for development of supersonic air-flights involve new studies on the human perception of sonic boom. Because this noise includes high-level components at very low-frequency, the usual psycho-acoustic tests with headphones are not relevant; instead, the original sound-field can be reproduced with many loudspeakers in a small room, but the loudspeakers must be contr...

Antioxidant Property of Jobelyn as the Possible Mechanism Underlying its Anti-amnesic Activity in Rodents

Introduction: Amnesia or loss of memory is the cardinal hallmark of Alzheimer’s disease (AD), a progressive neurodegenerative disorder associated with ageing process. Although, AD had been discovered over a century ago, drugs which could cure or halt the progression of the disease are yet to see the light of the day. However, there has been a growing interest in the use of phytomedicines with m...

Sonic Boom in the Little Bang at RHIC ?

The Big Bang Model is a widely accepted theory for the origin and evolution of our universe. It postulates that ∼ 12−14 billion years ago, a hot and dense plasma of quarks and gluons (QGP) was produced a few micro seconds after the “big bang”. A pervading uniform glow of cold cosmic microwave background provides an unequivocal signature for the subsequent expansion from this hot and dense state...

Prediction, Minimization and Propagation of Sonic Boom from Supersonic Bodies

This paper first describes the numerical simulation and shape optimization of the Lockheed SEEB-ALR and 69 Degree Delta Wing-Body for computing the sonic boom signature in the nearfield and its minimization using a genetic algorithm. Then the propagation of sonic boom in the atmosphere is simulated all the way to the ground for both the original and optimized body shapes. For flow field calcula...

Automatic Differentiation for Optimum Design, Applied to Sonic Boom Reduction