Vaughn College of Aeronautics and Technology

About: Vaughn College of Aeronautics and Technology is a education organization based out in New York, New York, United States. It is known for research contribution in the topics: Gravitational microlensing & Planetary system. The organization has 727 authors who have published 708 publications receiving 14082 citations. The organization is also known as: College of Aeronautics.

Social costs of aircraft noise and engine emissions: case study of amsterdam's schiphol airport

Abstract: With the increasing trend of charging for externalities and the aim of encouraging the sustainable development of the air transport industry, there is a need to evaluate the real social costs of the undesirable side effects of aircraft noise and engine emissions. The mathematical models, based on extensive literature reviews of existing externality measurements, are developed to derive the social costs of noise and engine emissions from aircraft movements in monetary terms by using Amsterdam's Schiphol Airport as a case study. Furthermore, the results of a survey on the current noise and engine emissions charges are briefly described and compared. The hedonic price method is applied to calculate the annual social cost of aircraft noise during the landing and takeoff stages of the flight. In contrast, the direct evaluation method is applied to estimate the social cost of each engine exhaust pollutant during different flight modes. The empirical results have shown that the average social cost of noise per a...

Numerical modelling and microstructural evolution of hybrid Ti-6Al-4V/Ti-Al-Si-Cu composite coating

Abstract: Additive manufacturing is a commercially competitive manufacturing technique with the possibility of altering the entire perception of design and fabrication It offers suitable capabilities for the building and repairing applications in the aerospace industry, which usually requires high level of accuracy and customization of parts which usually use materials known to pose difficulties in fabrication such as titanium alloys The major factors that determine the formation of the dendritic structure are the thermal gradients within the substrate during cooling and the cooling rates The rapid cooling and input of heat locally during the laser deposition process resulted in metallurgical modifications such as the formation of a complete martensitic structure, a mixture of columnar grains and layer of bands During the deposition process, the metal solidified, and the developed model enabled predictability of microstructural development and the sizes of the grain growth The 3D numerical investigation provided clarification and had substantial effects in the prediction of the overall resulting molten pool size and geometry size

A Dynamical Systems-Based Hierarchy for Shannon, Metric and Topological Entropy

Abstract: A rigorous dynamical systems-based hierarchy is established for the definitions of entropy of Shannon (information), Kolmogorov–Sinai (metric) and Adler, Konheim & McAndrew (topological). In particular, metric entropy, with the imposition of some additional properties, is proven to be a special case of topological entropy and Shannon entropy is shown to be a particular form of metric entropy. This is the first of two papers aimed at establishing a dynamically grounded hierarchy comprising Clausius, Boltzmann, Gibbs, Shannon, metric and topological entropy in which each element is ideally a special case of its successor or some kind of limit thereof.

Pilots' knowledge of the relationship between alcohol consumption and levels of blood alcohol concentration

Abstract: The U.K. Civil Aviation Authority is currently proposing that a maximum BAC (Blood Alcohol Concentration) limit of just 0.02% should be imposed on United Kingdom pilots. In this survey of 477 pilots, it was found that a large proportion could not determine when their BAC was likely to fall below this level after drinking alcohol and could, therefore, potentially inadvertently infringe the proposed regulation. Another large proportion of pilots felt that they were safe to fly before their BAC had dropped below 0.02%, which may be indicative of a willingness to infringe the regulations. Estimates of when it was safe to fly also became more inaccurate as the amount drunk increased and varied with the type of alcoholic beverage consumed. It was also found that the conclusions drawn were heavily dependent upon the formula used to estimate BAC. This methodological problem identified has considerable implications for the study of alcohol consumption when flying.