An instrumentation system was developed to measure the opacity of a hybrid rocket plume as a function of optical wavelength. The source consisted of collineated beams from two lasers, providing seven wavelengths in a single probe beam. Detection was accomplished with a spectrograph equipped with a photodiode array. Previous work with a two-wavelength system demonstrated the ability to follow th...

The paper shows a full 6 DOF modeling for a GRAD rocket in Earth’s non-inertial frame. For numerical purposes the modeling is limited to flat Earth approximation. The full motion equations are shown and all terms are explained together with the aerodynamics parameters for the entire flight envelope. Non-linear interpolation is used for aerodynamic coefficients and their derivatives. We present ...

Abstract Background A balanced diet and nutrition greatly influence our immune system’s ability regulate the risk severity of infections. This review presented possible patho-mechanisms vitamins C D in COVID-19 immunity. Main body Deregulation system including decreased level boosters is invariably reported COVID-19. Vitamin vitamin are among boosters; homeostasis those was found essential for ...

Design and Testing of Digitally Manufactured Para n Acrylonitrile-Butadiene-Styrene Hybrid Rocket Motors

Coagulation factor XI was purified from human plasma using ion-exchange chromatography and affinity chromatography on high molecular weight kininogen-Sepharose. A monospecific precipitating antiserum was prepared and used to study factor XI antigen. Factor XI did not migrate during electrophoresis at pH 8.3. High molecular weight kininogen (HMWK), an alpha globulin, reversibly associates with f...

The subject of this paper is the study of singular arcs (i.e. with a non maximal thrust) for a space launcher problem. We consider a flight to the GTO orbit for a heavy multi-stage launcher (Ariane 5 class), and use a realistic physical model for the drag force and rocket thrust. As a preliminary result, we first solve the complete flight with stage separations, at full thrust. Then we focus on...