An active all-optical high-efficiency broadband terahertz device based on an organometal halide perovskite (CH3NH3PbI3, MAPbI3)/inorganic (Si) structure is investigated. Spectrally modulation of the THz transmission obtained in frequency range from 0.2 to 2.6 THz, and a depth nearly 100% can be achieved with low-level photoexcitation power (∼0.4 W/cm2). Both reflection were suppressed MAPbI3/Si by external continuous-wave (CW) laser. Enhancement charge carrier density at interface crucial...

Relatively little is known about the fretting mechanism of high power connectors used in hybrid vehicles, even though vehicles are widely being introduced to market. This paper experimentally investigates mechanisms silver-plated caused by vibrations. In order emulate operational and environmental effects, a test stand was designed that capable measuring electrical contact resistance (ECR), relative displacement connector temperature. The experimental results show variation ECR subject...

Electrical contacts influence the reliability and performance of relays, electrical connectors, high power similar systems, are therefore a key region which needs to be considered. In current study, new inclusive multiphysics (involving mechanical, electrical, thermal fields) finite element model (FEM) 35A automotive connector has been developed. The contact resistance is predicted using multiscale rough surface method embedded in FEM. coupled solved obtain stresses, displacements,...

A modulation of terahertz response in a highly efficient, electric-controlled conjugated polymer-silicon hybrid device with low photo-excitation was investigated. The forms structure, where the active depletion region modifies semiconductor conductivity real time by applying an external bias voltage. THz transmission efficiently modulated effective controlling. In THz-TDS system, depth reached nearly 100% when applied voltage 3.8 V at laser intensity 0.3 W/cm2. saturation decreased...

In the past decade, general public's means of transportation has begun to undergo a radical transformation, moving away from only using gasoline and toward combination electricity. One parameter that shouldn't stand in way is overall reliability electric vehicle, which dependent upon connections between power source motor. Using multi-physics finite element software package multiscale predictions electrical thermal contact resistance, model was constructed predict behavior round pin, high...

Abstract This paper confirms the 1‐2‐3‐conjecture for graphs that can be edge‐decomposed into cliques of order at least 3. Furthermore we combine this with a result by Barber, Kühn, Lo, and Osthus to show there is constants such every graph , where minimum degree satisfying 1‐2‐3‐conjecture.

Electrical contacts influence the reliability and performance of relays, electrical connectors, high power similar systems, are therefore a key region which needs to be considered. In current study, new inclusive multi-physics (involving mechanical, thermal fields) finite element model (FEM) 35A automotive connector has been developed. The contact resistance is predicted using multiscale rough surface method embedded in FEM. coupled solved obtain stresses, pressures, resistances, voltage,...

Relatively little is known about the fretting mechanism of high power connectors used in hybrid vehicles, even though vehicles are widely being introduced to market. This work experimentally investigates mechanisms silver-plated caused by vibrations. In order emulate operational and environmental effects, a test stand was designed that capable measuring ECR, relative displacement connector temperature. The experimental results show variation electrical contact resistance (ECR) subject...

Optical metrology using phase measurements has benefited significantly from the introduction of phase-shifting methods, first in interferometry, then also fringe projection and reflection. As opposed to latter two techniques generally use a spatiotemporal approach: A sequence patterns with varying spacing is used, map each generated by temporal shifting, allow unique assignments projector or screen pixels camera pixels. One ubiquitous problem structured-light that artefacts appear near...

By Smith’s theorem, if a cubic graph has Hamiltonian cycle, then it second cycle. Thomason [‘Hamilton cycles and uniquely edge-colourable graphs’, Ann. Discrete Math. 3 (1978), 259–268] gave simple algorithm to find the Thomassen [private communication] observed that there exists polynomially bounded for finding cycle in cyclically 4-edge connected $G$ , any . In this paper we present class of bipartite graphs $G_{i}$ with $16(i+1)$ vertices such Thomason’s takes $12(2^{i}-1)+3$ steps

The complex dielectric permittivity of pure ice is measured using the transmission/reflection method in rectangular waveguide at frequencies between 2.6GHz and 3.9GHz over temperature range from -25 to -2.5°C, order extract influence frequency on properties quantitatively. S band microwave particularly investigated because its importance specialty. experiments this study show that real part around 3.16, independent frequency. imaginary changes with nonlinear function special point 3.3GHz...

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A dual-lens collimation and shaping system which is composed of a rotationally symmetric lens an aspherical cylindrical proposed in this paper. The design method discussed detail, the divergent elliptical laser beams are finally converted into collimated circular beams. simulation results show that maximum divergence angle can be to 2.58 µrad, standard deviation edge beam radius samples (SDRS) decreased from original 4.227 0.135 mm, ratio waist (RBW) drops 1.554 1.0093 case output 40 mm....

To improve the transmission efficiency of Cassegrain antennas and enable simultaneous signals with different wavelengths in antenna system, this study introduces Fresnel lenses conical front at transmitting end. Reflective mirrors focusing are introduced receiving A detailed description is provided design process for lens, as well impact various parameters on hollow radius when combined lens. Based laws vector reflection refraction, simulations performed to track propagation light through...

In this paper, we combined spiral zone plates and gratings using a logical XOR operation, designing new optical element called the composited modified plate grating (CMSZPG), which can generate multiple focused vortices on same focal plane. The parameters of CMSZPG are optimized genetic algorithm, enables generation equal intensity vortex beams without complexity manual adjustments, thereby reducing workload. theoretical feasibility component has been validated through simulations...

Abstract This study presents a multi-wavelength, multi-channel, and high-capacity optical antenna system. approach is intended to allow parallel transmission with many channels wavelengths by employing ring array of vertical-cavity surface-emitting lasers, reception accomplished via detector array. The system employs spatially multiplexed techniques send the target numerous independent signals at same time, effectively increasing bandwidth reducing signal interference. method used in this...

Heat transfer measurements on a heated curved thin sheet are performed by infrared thermography. The evolution of the temperature field is recorded to calculate heat flux using two-dimensional unsteady balance equation. thermal conduction term estimated projection relationship between surface and horizontal plane. Natural convection neglected during estimation this flux. Unlike traditional means measurement, method non-intrusive can measure distribution within space, allowing an easier...

Purpose This paper aims to propose a type of T-shaped two-axis force sensor for measuring the forces in x - and z -axes. The developed has simple structure can be effectively assembled into compact devices. Design/methodology/approach A plate, with both ends fixed on base, is used as substrate sensor. Eight strain gauges are placed root plate or near head, which construct two full Wheatstone bridges upper lower surfaces plate. When -axes applied different deformation generated gauges....

Abstract In this work, WC-Ni-based composites with fullerene-like WS2 nanoparticles were fabricated by pulsed electric current sintering. High pressure could assist in low-temperature sintering of the composite. The sliding wear behavior against WC-Ni counterbodies was also studied reciprocating ball-on-plate mode. friction coefficient composite reduced incorporated lubricant. Cross-sectional transmission electron microscopy and energy dispersive X-ray elemental mapping further suggest that...