The emerging fields of silicon (Si) photonic micro–electromechanical systems (MEMS) and optomechanics enable a wide range novel high-performance devices with ultra-low power consumption, such as integrated optical MEMS phase shifters, tunable couplers, switches, optomechanical resonators. In contrast to conventional <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m...

Abstract An overall radar structure with 2-D arrayed independent conjugate sealed air ducts is discussed. It can operate well in a strong electromagnetic radiation environment. Completely sealed, the case consists of two installation cavities. The front cavity achieves wave transmission and reception lessens from large power microwave weapons, making it possible for radar’s transmitting receivi...

The temperature of zeolite samples containing various adsorbed molecules was rapidly changed (within 15 s) from room temperature to 600 K by means of a laser beam. The location of the sealed glass ampoule in a boron nitride container decreases the temperature gradient in the sample and avoids laser-induced reactions. The technique facilitates time-dependent magic-angle-spinning (MAS) NMR spectr...

We have developed a macroscopic description of coherent electro-magnetic radiation from air showers initiated by ultra-high energy cosmic rays in the presence of the geo-magnetic field. This description offers a simple and direct insight in the relation between the properties of the air shower and the time-structure of the radio pulse. As we show the structure of the pulse is a direct reflectio...

T he possible utilization of sealed .. membranes supported by a small in­ ternal air pressure' has now become a practical solution for a number of architectural problems, We are fa­ miliar with the application of pneu­ matic enclosures to sports arenas, hermetically-sealed food stores, and warehouses, as well as temporary convention and exhibition stadiums. In all of these cases, lightness of w...

Regarding the importance of ring spinning method among spinning systems, great potentials exist for research about on the improvement of the quality and properties of ring spun yarn. This study aims to improve yarn quality by changing the shape and dimensions of spinning triangle through forming a groove in the middle zone of the front darfting roller with a curvature of 5 to 7 mm. For the to...

This paper introduces novel vacuum/compression valves (VCVs) utilizing paraffin wax. A VCV is implemented by sealing the venting channel/hole with wax plugs (for normally-closed valve), or to be sealed by wax (for normally-open valve), and is activated by localized heating on the CD surface. We demonstrate that the VCV provides the advantages of avoiding unnecessary heating of the sample/reagen...

In this paper we discuss the design, control, and experimentation of internally-actuated rovers for the exploration of low-gravity (micro-g to milli-g) planetary bodies, such as asteroids, comets, or small moons. The actuation of the rover relies on spinning three internal flywheels, which allows all subsystems to be packaged in one sealed enclosure and enables the platform to be minimalistic, ...

Submitted for the DFD17 Meeting of The American Physical Society Wake instabilities of flow over a spinning circular disk at angle of attack1 MARCUS LEE, TIM COLONIUS, BEVERLEY MCKEON, Caltech — A circular disk spinning about its axis of rotational symmetry is inherently robust to external disturbances due to gyroscopic moments and is therefore a promising configuration for a robust micro air v...