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[IEEE 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Ottawa, ON, Canada (2019.7.8-2019.7.12)] 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Simulation of quantum light sources using the self-consistently coupled Schr??dinger-Poisson-Drift-Diffusion-Lindblad syste
摘要： A very-large-scale integration capable of extracting motion features from moving images in real time has been developed employing row-parallel and pixel-parallel architectures based on the digital pixel sensor technology. Directional edge filtering of input images is carried out in row-parallel processing to minimize the chip real estate. To achieve a real-time response of the system, a fully pixel-parallel architecture has been explored in adaptive binarization of filtered images for essential feature extraction as well as in their temporal integration and derivative operations. As a result, self-speed-adaptive motion feature extraction has been established. The chip was designed and fabricated in a 65-nm CMOS technology and used to build an object detection system. Motion-sensitive target image localization was demonstrated as an illustrative example.
关键词： parallel architecture,digital pixel sensor (DPS),Block-readout scheme,motion feature extraction (MFE),vision chip
更新于2025-09-23 15:21:01
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Enhancing the Reliability of Protection Scheme for PV Integrated Microgrid by Discriminating between Array Faults and Symmetrical Line Faults using Sparse Auto Encoder
摘要： The ever increasing power demand and the stress on reducing carbon footprint have paved the way for widespread use of PV integrated microgrid. However, the development of a reliable protection scheme for PV integrated microgrid is challenging because of the similar voltage-current profile of PV array faults and symmetrical line faults. Conventional protection schemes based on pre-defined threshold setting are not able to distinguish between PV array and symmetrical faults, and hence fail to provide separate controlling actions for the two cases. In this regard, a protection scheme based on sparse auto-encoder and deep neural network (SAE-DNN) approach has been proposed to discriminate between array faults and symmetrical line faults in addition to performing the tasks of mode detection, fault detection, classification and section identification. The voltage and current signals retrieved from relaying buses are converted into grayscale image dataset, which is fed as input to the SAE to perform the unsupervised feature learning. The performance of proposed scheme has been evaluated through reliability analysis and compared with ANN, SVM and DT based techniques under both islanding and grid-connected mode of the microgrid. The scheme has been also validated for field applications by performing real-time simulations on OPAL-RT digital simulator.
关键词： sparse auto-encoder,classification,deep neural network,PV integrated microgrid,section identification,protection scheme,fault detection,OPAL-RT digital simulator
更新于2025-09-23 15:21:01
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In situ synthesis of a cadmium sulfide/reduced graphene oxide/bismuth Z-scheme oxyiodide system for enhanced photocatalytic performance in chlorinated paraben degradation
摘要： An efficient reduced graphene oxide (rGO)-based cadmium sulfide/reduced graphene oxide/bismuth oxyiodide (CdS/rGO/BiOI) Z-scheme system was fabricated by an in-situ growth method. Solid interactions between the rGO and nanoparticles promoted the transmission of photoinduced carriers, which separated and accumulated electrons from CdS and holes from BiOI. Moreover, the Z-scheme system enabled CdS electrons to maintain a high reduction capability and BiOI holes to maintain a high oxidation capability. Therefore, the CdS/rGO/BiOI composite exhibited better photocatalytic activity in the degradation of methyl 3,5-dichloro-4-hydroxybenzoate (MDHB) than that of pure CdS and BiOI under visible light irradiation. In particularly, the identification of active species and transformation products revealed that the accumulated photoinduced electrons promoted the reductive dechlorination of MDHB. The dechlorinated byproducts were then oxidatively split and degraded into harmless small-molecule carboxylic acids or inorganic substances by photoinduced holes. This work provided a favorable in situ growth method to design and synthesize Z-scheme photocatalysts for simultaneous chlorinated paraben dechlorination and degradation under visible light irradiation.
关键词： Dechlorination,Visible light photocatalysis,CdS/rGO/BiOI composite,Z-scheme,Chlorinated paraben
更新于2025-09-23 15:21:01
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A pump-probe scheme with a single chirped pulse to image electron and nuclear dynamics in molecules
摘要： A single chirped few-femtosecond pulse can be used to control and image coupled electron-nuclear dynamics. Using full ab initio simulations of the simplest molecule, H+2, as a prototype target, we show that for intermediate values of the chirp, interference between sequential and direct contributions enables significant control over ionization yields, even when taking into account the effective decoherence introduced by nuclear motion and the presence of an electronic continuum. For larger values of the chirp, the single chirped pulse reproduces a classical pump-probe setup, with the chirp parameter mapping an effective time delay between the pumping and probing frequencies of the pulse. After demonstrating this numerically, we present a full analytical solution for the two-photon ionization amplitudes that provides an intuitive analogy between the molecular dynamics induced by a single chirped pulse and a traditional pump-probe setup.
关键词： pump-probe scheme,attosecond science,chirped pulse,molecular ionization,electron-nuclear dynamics
更新于2025-09-23 15:21:01
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Unconditional La?? convergence of a compact ADI scheme for coupled nonlinear Schr??dinger system
摘要： In this paper, a three-level compact alternating direction implicit (ADI) scheme is formulated for the two-dimensional coupled nonlinear Schr¨odinger system. By using an important new lemma and a mathematical induction method, it is proved that the compact ADI scheme is unconditionally convergent in L∞ norm with the convergence order of two in time and four in space. Numerical experiments have been conducted to support the theoretical results and show the e?ciency of the new method.
关键词： Coupled nonlinear Schr¨odinger system,Compact ADI scheme,Convergence in L∞ norm
更新于2025-09-23 15:19:57
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Numerically Implemented Impact of a Femtosecond Laser Pulse on Glass in the Approximation of Nonlinear Maxwell Equations
摘要： A finite-difference scheme is presented for the solution of the problem on the interaction of a femtosecond laser pulse with glass in the approximation of nonlinear Maxwell equations supplemented by equations of the hydrodynamic type for conduction electrons. The model takes into account all the basic physical processes involved in this interaction. An axially symmetric problem is considered. The construction of the scheme allows for the specifics of the problem, which ensures the efficiency of the developed method. The use of the scheme is illustrated by the results of modeling the interaction between glass and femtosecond laser pulses of an ordinary Gaussian shape with linear polarization and doughnut pulses with radial and azimuthal polarization. Significant differences in the dynamics of the interaction between glass and these three types of pulses are revealed.
关键词： aperture,nonlinear Maxwell equations,femtosecond laser pulse,Kerr effect,finite-difference scheme,implicit algorithms,plasma
更新于2025-09-23 15:19:57
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CdS quantum dots modified surface oxygen vacancy defect ZnO1-x-TiO2-x solid solution sphere as Z-Scheme heterojunctions for efficient visible light-driven photothermal-photocatalytic performance
摘要： CdS quantum dots (QDs) modified surface oxygen vacancy defect ZnO1-x-TiO2-x solid solution spheres were prepared by using a hydrothermal, chemical reduction and electroless plating strategy, which have sufficient negative conduction band potential while having a photoresponse in visible light region. According to the band energy alignment, Z-scheme structure is formed, which favors spatial charge separation. The obtained CdS QDs/ZnO1-x-TiO2-x heterojunctions with the gap of ~2.09 eV exhibit excellent photothermal performance and photocatalytic degradation of bisphenol A (~99.5%), 2,6-dichlorophenol (~99.1%), and 2,4,5-trichlorophenol (~98.9%). It can be attributed to the following reasons: (1) a solid solution strategy can be used to enhance the photocatalytic activity of a given semiconductor photocatalyst. (2) The presence of oxygen defects can extend the photoresponse to visible light region. (3) TiO2-x-ZnO1-x and CdS QDs can form Z-Scheme heterojunctions to increase the spatial separation of photogenerated electron-holes, which can promote photocatalytic performance. After recycle test, the resultant catalysts show high stability, which has superiority in practical application. So this novel CdS QDs modified surface oxygen vacancy defect ZnO1-x-TiO2-x solid solution sphere will have potential applications in environmental fields.
关键词： Photothermal-photocatalytic,Solid solution,Oxygen vacancy defect,Z-Scheme heterojunction,Quantum dot
更新于2025-09-23 15:19:57
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[IEEE 2019 Chinese Control Conference (CCC) - Guangzhou, China (2019.7.27-2019.7.30)] 2019 Chinese Control Conference (CCC) - A Novel Multi-Objective optimization Model for Integrated Photovoltaic/Hydroelectric Power Generation Operation
摘要： A very-large-scale integration capable of extracting motion features from moving images in real time has been developed employing row-parallel and pixel-parallel architectures based on the digital pixel sensor technology. Directional edge filtering of input images is carried out in row-parallel processing to minimize the chip real estate. To achieve a real-time response of the system, a fully pixel-parallel architecture has been explored in adaptive binarization of filtered images for essential feature extraction as well as in their temporal integration and derivative operations. As a result, self-speed-adaptive motion feature extraction has been established. The chip was designed and fabricated in a 65-nm CMOS technology and used to build an object detection system. Motion-sensitive target image localization was demonstrated as an illustrative example.
关键词： parallel architecture,digital pixel sensor (DPS),Block-readout scheme,motion feature extraction (MFE),vision chip
更新于2025-09-23 15:19:57
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[Lecture Notes on Data Engineering and Communications Technologies] International Conference on Intelligent Data Communication Technologies and Internet of Things (ICICI) 2018 Volume 26 || Global Fairness Model Estimation Implementation in Logical Layer by Using Optical Network Survivability Techniques
摘要： Optical communication network plays a predominant role in the life of the user(s) system by providing high demand i.e. digital signal levels, fair queuing and channel reuse for high capacity links. In optical communications, Optical Component and Parameter (OCP) are becoming more accurate in order to provide the significance of the optical devices. Optical networks are enhanced in order to afford the optical technologies connectivities to provide high end communication in terms of sustainability and survivability. In survivability concept, two layers plays a significant/vital role between source to destination i.e. end to end connectivities is much reliable in terms of node connectivities, flow connectivities hence local to global fair queuing is achieved with the lower bound to upper bound and vice versa. Further the path propagation determines the range of path propagation determines the range of packets and its estimation is measured by using the concept of node mobility and scalability. It achieves the global range of optical packet transmission reception and design issues in network architecture analysis.
关键词： Network Architecture Analysis (NAA),Optical Protection Restoration Scheme (OPRS),Spatial Channel Reuse (SCR),Optical Demand Distribution (ODD)
更新于2025-09-23 15:19:57
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Fabrication of novel AgBr/Bi <sub/>24</sub> O <sub/>31</sub> Br <sub/>10</sub> composites with excellent photocatalytic performance
摘要： Novel porous AgBr/Bi24O31Br10 (AB/BOB) heterojunction composites were prepared by a hydrothermal calcination-ion exchange route and their physico-chemical properties were characterized by XRD, XPS, SEM, EDX, UV-vis DRS, BET and electrochemical measurements. The photocatalytic activity of the composites consisting of different AB/BOB mass ratios was evaluated by degradation of methylene blue (MB) under visible light irradiation. Compared with pure AB and BOB, the porous 20% AB/BOB composite exhibits much enhanced photocatalytic activity with good cycling stability. The significant enhancement in photoactivity is contributed to by both a high adsorption capacity and the separation efficiency of photo-generated electron–hole (e–h+) pairs via a Z-scheme mechanism. In addition, radical scavenging experiments confirm that the reactive ?OH radicals play an important role in the photocatalytic reaction. The novel AB/BOB heterojunction composites could have a promising application in treatment of various dyestuff wastewaters on a large scale.
关键词： AgBr/Bi24O31Br10,heterojunction,Z-scheme mechanism,photocatalysis,visible light
更新于2025-09-19 17:15:36