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We predict a jet-like rise of excessive charge concentration that delays 2D plasmon generation in electron-energy-loss spectroscopy; revealing an analogy to the Rayleigh jet in a splashing phenomenon prior to the launching of ripples.
A low refractive index liquid-core fiber is formed under anti-resonant guidance mechanism with broad transmission band and single modeness. A Raman spectroscopy experiment shows the versatility of this fiber platform for biochemical sensing.
It is well know that the interaction between poorly damped LC input filter with dc-dc converter lead to degradation of dynamic performance and fault scenario of the system. This problem also often occurs in fuel cell systems. Due to the relatively low and unregulated output voltage, the high gain boost converter is need in such application. A floating interleaved boost converter (FIBC) is selected...
In this paper, a two-dimensional modeling approach for a proton exchange membrane fuel cell (PEMFC) for real-time control implementation. The proposed model considers multi-physical domains in both electrochemical and fluidic. The developed 2-D model considers in particular the fuel cell flow field geometric form. The characteristics of reactant gas flow in the serpentine pipeline and diffusion phenomena...
Collaboration between heterogeneous robots can greatly improve the overall robot system by obtaining capabilities that each single robot is unable to achieve. In this paper, we present a collaborative robot system designed for search and rescue missions in an unknown environment with obstacles. The system consists of an aerial robot and a ground robot. An extended Kalman filter (EKF) is used for...
Circuit breakers are important equipment to control the energy distribution and fault isolation in power grid. With the development of the power grid in China, the evaluation of health status of circuit breaker in operation becomes an important part of the operation management. A number of studies have been made on the evaluation of circuit breaker health status, but are mostly limited to interpretation...
This paper presents a multi-physique model for a micro tubular solid oxide fuel cell (SOFC) using syngas as fuel. The fuel cell model includes syngas co-oxidation phenomenon and is demonstrated through the electrochemical, fluidic and thermal dynamic characteristics of the fuel cell. The developed model is validated experimentally under varies operating conditions at different reaction temperatures,...
In this paper, we propose a trajectory generation framework for quadrotor autonomous navigation in unknown 3-D complex environments using gradient information. We decouple the trajectory generation problem as front-end path searching and back-end trajectory refinement. Based on the map that is incrementally built onboard, we adopt a sampling-based informed path searching method to find a safe path...
Mild cognitive impairment (MCI) is constructed as an intermediate stage between normal aging and Alzheimer disease (AD). Various clinical criteria have been developed to quantify the risk of MCI patients converting to AD. One risk assessment criterion in assisting clinical decision is based on the amount of cerebral amyloid measured with florbetapir-fluorine-18 positron emission tomography (18F-AV45-PET)...
For wireless sensor networks (WSNs) distinguished by dynamic topology always has large number of nodes, the node's address management is a challenge issue in many WSNs application systems. Based on the basic principle of Dynamic Host Configuration Protocol over IPv6 (DHCPv6), a novel scheme of address allocation and management for large-scale WSNs is presented. Address allocation scheme based on client...
As one of the fastest-growing imaging modalities in recent years, photoacoustic imaging has attracted tremendous research interest for various applications including anatomical, functional and molecular imaging. Majority of the photoacoustic imaging systems are based on time-domain pulsed photoacoustic method, which utilizes pulsed laser source to induce wideband photoacoustic signal revealing optical...
Deep brain stimulation (DBS) provides a recognized research intervention for neurological disease currently. However, there is a lack of traditional electrical stimulator to observe neuronal firing activity synchronously. The aim of the present study was to realize concurrent detection of neuronal signals better under a nerve stimulation system control. Herein, we designed an integrated software,...
Wireless capsule endoscopy (WCE) can painlessly capture a large number of images inside the intestine. However, only a small portion of these WCE images contain hemorrhage. It is thus critical to develop automated hemorrhage detection method to facilitate the diagnosis of intestinal diseases. However, automated hemorrhage detection is complicated by 1) the extreme imbalance between the amount of hemorrhage...
A suitable energy management strategy is essential to reduce hydrogen consumption of fuel cell hybrid electric vehicles (FCHEVs) and limiting its negative effects. Many different methods for the energy management of FCHEVs are being used. As common used optimization-based approaches, the genetic algorithm and dynamic programming (DP) are frequently used in global optimization control to improve the...
In order to study the topology of the Earth-Mars relaying network with the Sun-Earth Lagrange points L4 and L5 used as the relaying nodes, 0–1 programming model on one-hop link and two-hop links was set up, the maximum throughput as the objective function, and total minimum throughput and accumulated connection time of each day as the constraint condition. A network topology is designed for one Earth-Mars...
A 16-channel implantable microelectrode array (MEA) was designed and fabricated by Micro-electromechanical Systems (MEMS) technology. Then the electrode sites were modified with platinum/graphene oxide nanocomposites (Pt-GO) by one-step electrochemical deposition and later handled by cyclic voltammetry reduction in phosphate buffer solution. Finally, a Nafion thin film was coated on the MEA surface...
In this work, we present a solution to real-time monocular dense mapping. A tightly-coupled visual-inertial localization module is designed to provide metric and high-accuracy odometry. A motion stereo algorithm is proposed to take the video input from one camera to produce local depth measurements with semi-global regularization. The local measurements are then integrated into a global map for noise...
In this paper, we present an optimization-based framework for generating quadrotor trajectories which are free of collision in dynamic environments with both static and moving obstacles. Using the finite-horizon motion prediction of moving obstacles, our method is able to generate safe and smooth trajectories with minimum control efforts. Our method optimizes trajectories globally for all observed...
Although typically the far-field radar cross section (RCS) of targets is of interest, researchers often find it convenient to perform RCS measurements in near-field. To obtain far-field RCS using near-field measurements, traditional methods are developed based on the near-field far-field transformation (NFFFT). These methods are sensitive to various imperfections of the real-world measurement environment...
Accurate state of charge (SOC) is critical for battery energy management system in electric vehicle (EV) application. Overcharge and over discharge will shorten battery's lifespan and induce potential safety problem, which may even permanently damage the lithium-ion battery. Thus, a data driven model is proposed for improving the accuracy of SOC estimation in this paper. A preliminary mathematic model...
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