This report summarizes modeling studies supporting the second phase of quarter-scale testing for the NTSB investigation of the TWA Flight 800 accident. In this study, fuel-air tests were conducted to replicate earlier tests to assure repeatability of results. The quarter-scale test tank was redesigned to use heated Jet-A fuel/air mixtures at reduced ambient pressures. Although violent combustio...

Introduction. The Karman-vortex street formed behind two-dimensional bluff bodies has attracted interest because of its beautiful flow pattern. It goes without saying that this beautifulness results from the alternative vortices regularly shed from the body. Vortex shedding induces aerodynamic force perpendicular to the mean flow. This force causing mechanical vibration of the model is accompan...

Fish are increasingly popular subjects in behavioural and neurobiological research. It is therefore important that they are housed and handled appropriately to ensure good welfare and reliable scientific findings, and that species-appropriate behavioural tests (e.g. of cognitive/affective states) are developed. Routine handling of captive animals may cause physiological stress responses that le...

Quentin Skinner is an intellectual historian known for his pioneering work on early-modern European political thought. He was educated at Bedford School and Gonville and Caius College, Cambridge. Author of such works as The Foundations of Modern Political Thought (1978) and Visions of Politics (2002) he served as the Regius Professor of History at the University of Cambridge, and currently as t...

The paper deals with the high-fidelity modeling and simulation of a powered parafoil-payload system with respect to its application in autonomous precision airborne cargo delivery. In the proposed concept the cargo transfer is accomplished in two phases: Initial towing phase when the glider follows the towing vessel in a passive lift mode and the autonomous gliding phase when the system is guid...

Abstract A bulbous bow is a widely employed feature to enhance the hydrodynamic resistance of ships. More than 95% merchant fleet incorporates various types bows reduce wave-making and wave breaking. Bulbous also utilized in smaller vessels like fishing vessels. In certain cases, initial ship design includes addition by default. this study, which focuses on typical Argentinian trawler vessel, w...

Propulsion noise is an enduring problem of significant military and environmental importance. Hence, it crucial to investigate propeller characteristics. In this study, the hydrodynamic performance level DARPA (Defense Advanced Research Projects Agency) Suboff submarine with E1619 were analyzed. The hull resistance hydrodynamics studied separately, numerical results validated using available ex...

Cases of deaths in manure or septic tanks are rare in legal-medical practice, more frequently as unfortunate occupational accidents. Poisoning with toxic gases, especially with hydrogen sulfide, is reported as the cause of death, while the exhaustion of oxygen in the air is omitted with the simultaneous excess of carbon dioxide. In such cases, determination of the direct cause of death constitu...

This study investigated the effect of the coefficient of friction of a running surface on an athlete's sprint time in a sled-towing exercise. The coefficients of friction of four common sports surfaces (a synthetic athletics track, a natural grass rugby pitch, a 3G football pitch, and an artificial grass hockey pitch) were determined from the force required to tow a weighted sled across the sur...