BACKGROUND The hand pattern used during manual wheelchair propulsion (i.e., full-cycle hand path) can provide insight into an individual's propulsion technique. However, previous analyses of hand patterns have been limited by their focus on a single propulsion condition and reliance on subjective qualitative characterization methods. The purpose of this study was to develop a set of objective q...

Abstract The composite over-wrapped pressure vessel (COPV), which were made by ultra-thin metal liner and high strength carbon fiber reinforced plastic (CFRP), has performance factor (PV/W). COPV widely used in electric propulsion system (EPS) of space system. ANSI/AIAA S-081-2000 is a general standard for aerospace field at home abroad, it specified the design elements, references, specificati...

Lighter and lighter products are required by aerospace automotive sectors in order to reduce fuel cost carbon dioxide emissions and, allow using green energy propulsion, such as the electric one. In lighten parts aluminium alloys, which have a high strength weight ratio, most commonly used metal materials. They manufactured through plastic deformation processes often tailored blanks. This work ...

High-speed permanent magnet synchronous machines are of great interest in the applications where high utilization factor and e ciency are required. Depending on application, power requirements change from kilowatts to megawatts. To investigate power limits of high-speed machines, the present feasibility study focuses on a 20 megawatt (MW) electric drive for marine propulsion. However, in additi...

In order to meet the needs of state and society for improving quality undergraduate education cultivating innovative talents, individualized training mode has gradually become direction higher reform. China, there is a long-standing situation that talent cultivation out touch with industrial demand. explore talents in new era, idea scientific research as feedback teaching established this paper...

We present a case of gelastic seizures in a student naval aviator. He was noted to have uncontrollable fits of laughter on several occasions, but was not referred to his flight surgeon until he had a gelastic seizure while flying in formation, which jeopardized the safety of the flight. He had an aura consisting of lack of concentration, which was then followed by 10 s or less of hysterical lau...

Shape-memory actuators are used where a large force and stroke are required and thermodynamic efficiency is not essential. Since the discovery of shape memory in titanium-nickel, a number of inventions have been made having applications in medicine, aerospace, automotive, and consumer products. These devices range in size from meters to micrometers. Sales are now more than a hundred million USD...