Abstract Phase‐change materials (PCMs) are used in several energy recycling utilization systems due to their latent‐heat‐storage and ‐release ability. However, the inability of PCMs release heat at temperatures below freezing point limits application distributed systems. This paper reports optically‐triggered low‐temperature based on a solid–liquid phase change (PC) controlled by trans – cis ( E Z ) photo‐isomerization azobenzene. To achieve this, photo‐responsive alkyl‐grafted Azo is...

Monitoring multiphase flow process and measuring its parameters have been a research topic that received broad attentions for the past decades. Ultrasonic tomography (UPT) obtains distribution of two-phase based on ultrasound propagation in different fluids, making it valuable to industrial monitoring measurement. UPT can nonintrusively explore transient hydrodynamics flow, but reconstruction quality single modality is always dependent phase distribution. In this paper, dual-mode fuses...

This paper presents an improved relative coupling control structure for multi‐motor speed synchronous driving system. Unlike the traditional structure, proposed introduces additional controller so that all motors in system can be treated as entity. It also takes importance of each motor's into consideration feedback process and compensation. Meanwhile, synchronisation tracking performance decoupled (i.e. independently adjusted) regulated by changing coefficient coefficient, respectively,...

A novel all-fiber sensor based on cascaded singlemode-no-core-singlemode (SNS) and siglemode-multimode-singlemode (SMS) fiber structure is proposed investigated. Simulation results show that for the given fibers, by appropriately choosing lengths of no-core multimode fiber, transmission spectrum will exhibit two distinguishable dips corresponding to SNS SMS, respectively. The simultaneous measurement liquids' refractive index (RI) temperature can be realized monitoring dips' central...

Utilizing the periodicity of rotating machinery, dynamic clearance measurement can be achieved with a single swept light source without any additional auxiliary devices, which has advantages simplicity and reliability. However, there is shortcoming that previous algorithm not fast enough to achieve real-time when machinery rotates at high speed. Aiming this shortcoming, utilizing correlation between mimic signal signal, combined information for multiple periods, algorithms corrected model...

Purpose This paper aims to present the mechanical design and kinematics of a novel rigid-flexible coupling hybrid robot develop promising aeroengine blades in situ repair technology. Design/methodology/approach According requirements analysis, is proposed by combining three degrees freedom (DOF) parallel mechanism with flexible continuum section. Then models both section are derived respectively. Finally, based on equivalent joint method, two-step numerical iterative inverse algorithm for...

Industrial process tomography possesses unique advantages in biphasic medium measurement and has received broad attention the past decades. Aiming at widely existing low-contrast medium, this article proposes a nonlinear ultrasonic transmissive (UTT) approach using continuous-wave excitation. Considering refraction effect interface, reconstruction method with forward problem prototype-based resolution enhancement algorithm is proposed higher accuracy, resolution, speed. The UTT system...

Two-phase flow widely exists in the process industry, where ultrasonic tomography provides reliable visualization with benefits of noninvasion, nonradiation, and low-cost. To provide real-time reconstruction low acoustic impedance contrast medium distribution existed two-phase flow, a novel approach using continuous-wave excitation is proposed. With basic measurement model introduced, subspace filtered algorithm introduced improvements on both accuracy speed. Through nonuniform shape...

Electrical Impedance Tomography (EIT) reconstructs the conductivity distribution in a sensing area through an array of boundary electrodes and has received increasing attention bio-impedance measurement. To provide accurate image reconstruction irregular large area, we propose efficient bilateral constrained dual modality algorithm using EIT ultrasonic measurement, where pre-reconstruction helps to select time flight (TOF) window ultrasound reflection information points contributes joint...

A key research area in autonomous driving is how to model the driver’s decision-making behavior, due fact it significant for a self-driving vehicles considering their traffic safety and efficiency. However, uncertain characteristics of vehicle pedestrian trajectories affect urban roads, which poses severe challenges cognitive understanding systems terms accuracy robustness. To overcome abovementioned problems, this paper proposes Bayesian driver agent (BDA) vision-based system with learning...

In this Letter, an ultracompact silicon-based waveguide crossing for dual polarizations is proposed and experimentally demonstrated using subwavelength-hole-assisted multimode interference couplers. Thanks to the flexible easy dispersion engineering in introduced couplers, reduced equal beat lengths are accessible via careful parametric optimization, consequently enabling a substantially device size. Experimental results indicate that (13.6 × 13.6 µm

A novel ultra-broadband TM-pass polarizer with high polarization extinction ratio (PER) and low reflection has been proposed demonstrated by utilizing multimode Bragg grating waveguide (MBGW) two tapered waveguides. By optimizing the period of MBGW, injected TE 0 mode is coupled into backward 2 effectively leaked cladding. Meanwhile, TM propagates through without any negative impact. The operation bandwidth can be significantly expanded cascading multiple MBGW structures, each which operates...

Background: A novel radioactive 125I seed-loaded biliary stent has been used for patients with malignant obstruction. However, the dosimetric characteristics of stents remain unclear. Therefore, we aimed to describe dosimetry different lengths — number as well activities seeds. Methods: The radiation three representative models was evaluated using a treatment planning system (TPS), thermoluminescent dosimeter (TLD) measurements, and Monte Carlo (MC) simulations. In process TPS calculation...

Ultrasonic process tomography (UPT) has great application potential in multiphase flow online monitoring due to its non-invasive, radiation-free and visualization features. Existing UPTs with individual transducers suffer from the small number of projection data, which results low imaging accuracy. This paper presents a novel modular scalable UPT system, i.e. an ultrasonic phased array (UPAT) system digital design, includes master control board up eight 16-channel ultrasound transceiver...

Two-phase flow is a regime that commonly existed in many applications of process industry, on which the technique ultrasonic tomography (UT) could provide reliable measurement with benefits non-invasion, non-radiation and low-cost. In order to considerable visualization low acoustic impedance contrast configurations two-phase flow, regular weighted simultaneous algebraic reconstruction (RW-SART) using continuous-wave excitation proposed presented detail. With strategy formulized model...

Oil-water biphasic medium widely existed in mining and transportation process of petroleum industry, where visualized measurement processes vital importance production increase, state monitoring fault prognosis. Ultrasonic Tomography (UT) is a non-invasive non-radioactive sensing modality industrial Process Tomography, which demonstrated as competitive technique with great potential. However, facing the refraction effect Ultrasound wave at oil-water interfaces, accuracy reconstruction...

Industrial process tomography (PT) possesses unique advantages in multiphase distribution imaging. Oil–gas–water three-phase has coexisting high-impedance contrast and low-impedance medium, possessing a challenge to traditional PT sensing technique. An original concept of multifrequency ultrasonic (MFUT) is proposed, which reconstructs oil–gas–water with the single modality UT. Operated transmissive (UT) framework, proposed MFUT quantifies attenuation spectrum response under...

Abstract Industrial ultrasonic tomography (UT) possesses a unique advantage in gas–liquid two-phase distribution measurement and has received broad attention over the past decades. Focusing on liquid-dominated gas-inclusion reconstruction, we propose strategy of multi-frequency fusion UT (MFFUT), which comprehensively models transmission attenuation self-adaptive reconstruction images through processing data with frequency-dependent forward model metric-weighted algorithm. Significant...

Industrial ultrasonic tomography (UT) possesses unique advantages in visualizing multiphase medium and has received broad attention the past decades. Facing small bubble distribution imaging, current independent-transducer-based UT faces bottleneck problems of limited projection number large diameter. To image cross-sectional distribution, an original concept phase array (UPAT) is proposed by introducing ultrasound (UPA) transducers novel designed sensing strategy into UT. The UPAT emits a...