4 articles for “gravity assist”

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Research ArticleOpen accessPhrase in the titleGravity Assist and Scattering off AGB Stars off Molecular CloudsAhmad Hashem AbdelhadiThe scattering of stellar orbits by galactic molecular clouds is studied in hope of explaining isotopic peculiarities of presolar grains from Asymptotic Giant Branch (AGB) stars. Silicon isotopic anomalies found in the mainstream Silicon Carbide (SiC) grains are observed to have heavy isotopes enriched. To explain the isotopic heaviness I propose that AGB stars that formed in the interior region … …American Journal of Applied Sciences, Vol. 6, Issue 4 · 30 Apr 2009 · 7,420 accessesView PDF Cite

Research ArticleOpen accessEvery word in the titleStudy of the Parameters of Steam Assisted Gravity Drainage (SAGD) Method for Enhanced Oil Recovery in a Heavy Oil Fractured Carbonate ReservoirArzhang NabilouBy increasing in the use of nonrenewable energy and decreasing in discovering hydrocarbonic reservoirs, in near future the world will encounter with a new challenge in the field of energy, so increase in recovery factor of the existing oil reservoirs is necessary after the primary production. In one hand the existence of untouched heavy oil reservoirs in Iran and lack … …American Journal of Engineering and Applied Sciences, Vol. 9, Issue 3 · 6 Sep 2016 · 8,338 accessesView PDF Cite

Research ArticleOpen accessIn the abstractModern Propulsions for Aerospace-Part IIRelly Victoria Virgil Petrescu, Raffaella Aversa, Bilal Akash et al.Speaking about a new engine ionic means to speak about a new aircraft. The paper presents in a short time the actual engines ion chambers (called the ion thrusters) and other new ionic motors proposed by the authors. The engine (ionic propulsion unit of ions, that accelerates the positive ions through a potential difference) is approximately ten times more efficient … …Journal of Aircraft and Spacecraft Technology, Vol. 1, Issue 1 · 25 Apr 2017 · 8,118 accessesView PDF Cite

Research ArticleOpen accessIn the abstractAnalysis and Mechanical Design Solutions for Sit-To-Stand Assisting DevicesPierluigi Rea, Erika OttavianoSit-to-stand can be considered the most common daily-life activity and it can be defined as a change of posture, in which the base of support is transferred from the seat to the feet. It requires both voluntary movement of different body segments that contribute to the equilibrium and control during an important displacement of the Centre Of Gravity of the … …American Journal of Engineering and Applied Sciences, Vol. 9, Issue 4 · 11 Dec 2016 · 7,834 accessesView PDF Cite