This letter presents a novel and retractable ring-shaped quadrotor called Ring-Rotor that can adjust the vehicle's length width simultaneously. Unlike other morphing quadrotors with high platform complexity poor controllability, uses only one servo motor for but reduces largest dimension of vehicle by approximately 31.4%. It guarantee passibility while flying through small spaces in its compact...

BATMAN Upgrade (BUG) is a test facility for the production of negative ion beams from an RF driven plasma source devoted to supporting development ITER Neutral Beam Injection (NBI). BUG consists IPP prototype and multi-aperture grid system corresponding roughly beamlet group NBI system, i.e. arrangement 14 (vertical) ×5 (horizontal) Ø14 mm apertures, meaning beam comprised 70 individual beamlet...

In order to improve the flow state of a forebay, contraction diversion pier is discovered, geometric parameters which affect improvement state. this paper, standard k-? model in computational fluid dynamics (CFD) numerical simulation method used research forebay with pier. our research, single factor analyze influence different parameters. Then, optimal are given. Results show that can be conce...

we introduce and  study  fuzzy (co-)inner product and fuzzy(co-)norm of hyperspaces. in this regard by considering  the notionof hyperspaces, as a generalization of vector spaces, first we willintroduce the notion of fuzzy (co-)inner product in hyperspaces and will apply it to formulate the notions offuzzy (co-)norm and fuzzy (co-)orthogonality  in hyperspaces. inparticular, we will prove that ...

Abstract Combining the characteristics of existing transfer slideway and double-point hanging type two retractable devices, this paper proposes a multiple-point hoisting, fast transfer, device. According to viscous flow theory, one-way fluid-structure interaction simulation is used for gondola structure unmanned boat Considering influencing factors width gondola, void ratio, shape distribution ...

The ignition, puffing and sooting characteristics of Chinese RP-3 kerosene droplet burning have been studied using high-speed, OH* chemiluminescence soot thermal radiation imaging. experiments were conducted in air at standard temperature sub-atmospheric pressures ranging from 0.2 bar to 1 bar. was supported by a thermocouple tip ignited retractable coiled heating wire. results showed that the ...

Hypersonic vehicles are an important development direction in aerospace, and their will have a significant impact on world security, the of cosmic space resources related disciplines. Along with rapid modern aircraft, landing gear is commonly used retractable technology, which brings series problems, such as design hatch retraction heat sealing mechanism evaluation air tightness. This paper tak...

Since the invention of the personal computer, digital media has remained separate from the physical world, blocked by a rigid screen. In this paper, we present Beyond, an interface for 3-D design where users can directly manipulate digital media with physically retractable tools and natural hand gestures. When pushed onto the screen, these tools physically collapse and project themselves onto t...