- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Enhanced Performance and Stability of Ternary Organic Solar Cells Utilizing Two Similar Structure Blend Fullerene‐Free Molecules as Electron Acceptor
摘要： Two-dimensional amorphous semiconductor (2DAS) monolayers can be regarded as a new phase of 2D monolayers materials and will serve as a promising field for the various electronic and optoelectronic applications. Here, together with the first-principles calculations within density functional theory, we experimentally demonstrate that the 2DAS MoO3-x monolayers can enhance the electrochemical nitrogen reduction reaction (NRR). To be specific, the NH3 yield and faradaic efficiency (FE) reach 35.83 ug h-1 mg-1 cat at -0.40 V and 12.01 % at -0.20 V vs. reversible hydrogen electrode (RHE), respectively, and which can be dramatically improved than that of reported defective MoO3 nanosheets. Further theoretical calculations reveal that the high electrochemical performance in NH3 yield is contributed to the strong Anderson localization and electron confinement dimensionally. And such Anderson tail states can resonate effectively with the states of intermediate HNNH, playing the critical role in the rate limiting step of NRR. Integrated experimental findings and theoretical understanding, a new concept of Anderson confinement catalysis is put forward, and could be extended to other 2DAS for potential catalytic reactions.
关键词： Anderson localization,amorphous,nitrogen reduction reaction,molybdenum oxides,supercritical CO2
更新于2025-09-19 17:13:59
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[IEEE 2020 National Conference on Communications (NCC) - Kharagpur, India (2020.2.21-2020.2.23)] 2020 National Conference on Communications (NCC) - Simultaneous Measurement of Atmospheric Turbulence Induced Intensity and Polarization Fluctuation for Free Space Optical Communication
摘要： For the problem of action detection, most existing methods require that relevant portions of the action of interest in training videos have been manually annotated with bounding boxes. Some recent works tried to avoid tedious manual annotation, and proposed to automatically identify the relevant portions in training videos. However, these methods only concerned the identification in either spatial or temporal domain, and may get irrelevant contents from another domain. These irrelevant contents are usually undesirable in the training phase, which will lead to a degradation of the detection performance. This paper advances prior work by proposing a joint learning framework to simultaneously identify the spatial and temporal extents of the action of interest in training videos. To get pixel-level localization results, our method uses dense trajectories extracted from videos as local features to represent actions. We first present a trajectory split-and-merge algorithm to segment a video into the background and several separated foreground moving objects. In this algorithm, the inherent temporal smoothness of human actions is exploited to facilitate segmentation. Then, with the latent SVM framework on segmentation results, spatial and temporal extents of the action of interest are treated as latent variables that are inferred simultaneously with action recognition. Experiments on two challenging datasets show that action detection with our learned spatial and temporal extents is superior than state-of-the-art methods.
关键词： discriminative latent variable model,split-and-merge,action recognition,Action localization
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Encapsulation Techniques Using Electrically Conductive Adhesives for Building-Integrated Photovoltaics
摘要： Gas leakage source detection and boundary tracking of continuous objects have received a significant research attention in the academic as well as the industries due to the loss and damage caused by toxic gas leakage in large-scale petrochemical plants. With the advance and rapid adoption of wireless sensor networks (WSNs) in the last decades, source localization and boundary estimation have became the priority of research works. In addition, an accurate boundary estimation is a critical issue due to the fast movement, changing shape, and invisibility of the gas leakage compared with the other single object detections. We present various gas diffusion models used in the literature that offer the effective computational approaches to measure the gas concentrations in the large area. In this paper, we compare the continuous object localization and boundary detection schemes with respect to complexity, energy consumption, and estimation accuracy. Moreover, this paper presents the research directions for existing and future gas leakage source localization and boundary estimation schemes with WSNs.
关键词： boundary detection and tracking,diffusion model,Wireless sensor networks (WSNs),source localization
更新于2025-09-19 17:13:59
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[IEEE 2019 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering (QR2MSE) - Zhangjiajie, China (2019.8.6-2019.8.9)] 2019 International Conference on Quality, Reliability, Risk, Maintenance, and Safety Engineering (QR2MSE) - Degradation Study of 830nm Laser Diodes Based on PSpice Model and Accelerated Tests
摘要： In this paper, we consider the systematic design and implementation of grasping and transportation by a mobile robot with low implementation complexity. The study is mainly divided into three aspects: 1) design of a mechanical gripper and an arm mounted on the robot for grasping; 2) design of the hardware-communication configuration (HCC) for transportation guidance that includes a destination beacon and a sensor system on the robot that working together with some designed event-triggered communication mechanisms, among which the unique bearing-alignment mechanism is designed to calibrate the heading direction of the robot, the HCC is low cost in the sense of low energy consumption; and 3) an effective and low-cost heuristic transportation algorithm that is tightly incorporated with the designed HCC in an event-triggered manner. The particular contribution is the tight integration of the heuristic transportation algorithm and the HCC, and the very simple nature of the transportation algorithm dues to this integration, which passes some computational functions to the HCC. Numerical simulations and experiments are presented, showing the effectiveness of the proposed system.
关键词： mobile robot manipulation,manipulation,object grasping,localization,path planning,sensor fusion,transportation,navigation guidance,motion planning,Bearing-alignment mechanism,direction alignment,obstacle avoidance
更新于2025-09-19 17:13:59
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Dimer chains in waveguide quantum electrodynamics
摘要： We examine the propagation of single photons in periodic and disordered dimer chains coupled to one-dimensional chiral waveguides. Each dimer is composed of two dipole-coupled atoms. In the disordered setting, we separately treat two types of position disorder, namely in dimer length and in dimer separation. The focus of this study is to understand in what ways the interplay between dipole–dipole interactions and directionality of photon emission can impact the transport of single photons. Cold atoms trapped near optical fibers can serve as an experimentally realizable platform for the models that we consider.
关键词： Chiral quantum optics,Photon localization,Dipole–dipole interactions,Waveguide quantum electrodynamics,Position disorder
更新于2025-09-19 17:13:59
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Wave-shaped temperature dependence characteristics of the electroluminescence peak energy in a green InGaN-based LED grown on silicon substrate
摘要： This study aimed to investigate temperature dependencies at different injection currents (ICs) of the electroluminescence (EL) spectra from a green InGaN/GaN light-emitting diode (LED) based on multiple quantum wells (MQWs) grown on a Si substrate in a wide range of ICs (0.001–350 mA) and temperatures (6–350 K). The results show that the temperature-changing characteristic of the EL peak energy gradually evolves from an approximately V-shaped temperature dependence into a wave-shaped (three-step blueshift) dependence with increasing IC. Finally, it emerges as an approximately inverted V-shaped temperature dependence. The behavior reflects the fact that the emission related to InGaN is significantly influenced by the changing recombination dynamics of carriers with rising temperature or IC. This is attributed to the presence in the MQW active region of a stronger carrier localization effect across three zones with different average In contents. Moreover, with the decline of the temperature at lower ICs, the temperature behavior of the external quantum efficiency (EQE) value is dominated by the deactivated non-radiative centers. This phenomenon occurs not only in the higher temperature range but also at lower temperatures due to more In-content-induced structural defects, which are confirmed by measurements of the integrated EL intensity as well as the EQE dependence on IC.
关键词： electroluminescence,InGaN/GaN,carrier localization,LED,temperature dependence
更新于2025-09-19 17:13:59
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Clock and Data Recovery-Free Data Communications Enabled by Multi-core Fiber with Low Thermal Sensitivity of Skew
摘要： Underwater wireless optical communications are an emerging solution to the expanding demand for broadband links in oceans and seas. In this paper, a cellular underwater wireless optical code division multiple-access network is proposed to provide broadband links for commercial and military applications. The optical orthogonal codes are employed as signature codes of underwater mobile users. Fundamental key aspects of the network, such as its backhaul architecture, its potential applications, and its design challenges, are presented. In particular, a promising underwater localization and positioning scheme based on this cellular network is presented. Furthermore, the proposed network is used as infrastructure of centralized, decentralized and relay-assisted underwater sensor networks for high-speed real-time monitoring. Finally, probable design challenges, such as cell edge coverage, blockage avoidance, power control, and network capacity, are addressed.
关键词： power control,relay-assisted transmission,Underwater wireless optical communications,undersea localization and positioning,underwater sensor networks,optical CDMA networks
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE Intelligent Transportation Systems Conference - ITSC - Auckland, New Zealand (2019.10.27-2019.10.30)] 2019 IEEE Intelligent Transportation Systems Conference (ITSC) - Graph-based Map-Aided Localization using Cadastral Maps as Virtual Laser Scans
摘要： Environment-based localization algorithms, such as laser odometry, can achieve a remarkable accuracy on the local scale. For autonomous driving, however, it is mandatory to combine these estimates with global information to overcome large scale drift. Our approach uses freely accessible cadastral plans (building footprints) together with 2D laser information and odometry in a graph-based approach to realize real-time global localization. The main contributions of our work reside in the way we create a virtual laser scan from cadastral plans, and that we consider the observation integrity by identifying corridor-like environment configurations (ambiguous positioning along the longitudinal axis). Besides, we evaluate our approach on a vehicle in two urban scenarios. We present a comparison of the obtained precision using different relevant combinations of the proposed contributions and show that we can reach an average positioning accuracy of 55cm at best without requiring a first passage of an equipped vehicle to build a map.
关键词： laser scan,autonomous driving,localization,cadastral maps,graph-based
更新于2025-09-16 10:30:52
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Preoperative computed tomography-guided pulmonary nodule localization augmented by laser angle guide assembly
摘要： Background: There is an increasing need for thoracic medicine specialists to master preoperative localizations after high rates of sub-centimeter nodules have been positively screened by low-dose CT. The Laser Angle Guide Assembly? (LAGA), an innovative angle reference device for CT-guided pulmonary invasive procedures, has been developed to safely and efficiently aid in the performance of preoperative CT-guided localizations (POCTGL). Methods: The clinical and localization data of patients who received LAGA-assisted POCTGL for pulmonary nodules between May 2015 and June 2018 were collected and analyzed. Results: One hundred and eighty-seven patients with 266 pulmonary nodules received LAGA-assisted POCTGL. The number of lung nodules localized for one surgery ranged from 1 to 5, with >1 for 22.1% of the surgeries. The median nodule size was 6 mm. A hookwire was inserted in 32 (12%) of the nodules. Most (83.1%) of the localizations were completed with a single puncture. The median angle was 18 degrees. The median and maximum depths of the nodule to pleura were 12 and 60 mm, respectively. The median procedure time was 19 minutes. The successful targeting and field targeting rates were 100% and 98.1%, respectively. Pneumothorax was noted in 17 (6.4%) localizations that did not require chest drainage. The multivariable analyses for pneumothorax showed odds ratios of 2.4 (95% confidence interval, 1.2–4.9) for puncture times/nodule and 10.1 (95% confidence interval, 2.3–41.7) for tumors adjacent to the fissure, respectively. There was no incidence of hookwire migration. Conclusions: LAGA enhanced the precision of POCTGL by optimizing targeting precision and decreasing repeated punctures, which minimized complications, such as pneumothorax.
关键词： targeting,pulmonary nodules,CT-guided localization
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Multi-Qubit Registers of Individually Addressable Solid-State Defect Centers
摘要： Mesoscopic ensembles of qubits offer a platform for near-term applications in quantum technologies, as well as for studying many-body physics. Key in exploiting these systems is the ability to coherently control constituent qubits in a manner that leaves the quantum states of neighboring qubits unperturbed. Atom-like emitters in solids have emerged as a promising platform for computing, communications, and sensing. In particular, their long coherence times, coherent optical transitions, and the ability to couple to nearby long-lived nuclear spins make them excellent candidates for building medium-scale registers of coupled qubits. Here, we present progress towards producing and controlling such individually addressable ensembles. Our approach relies on the natural inhomogeneous distribution of optical transitions for solid-state color centers. This distribution allows us to excite individual centers even in tightly-grouped clusters. With this, we first demonstrate super-resolution localization and readout of individual nitrogen vacancy (NV) centers in diamond. We probe a system of three NV centers, demonstrating localization with a mean precision of 0.74 nm. While super-resolution imaging of NV centers has been achieved with other techniques, our approach uniquely allows for individual readout of single NVs in a cluster in a manner that maintains the states of nearby spins. We perform simultaneous control of two spin populations in a cluster of NVs, demonstrating preservation of coherence of one population during the optical readout of another. Lastly, we discuss recent work towards scalable creation of such clusters and techniques for producing systems of coupled spins with various defect centers.
关键词： spin-spin coupling,quantum technologies,super-resolution localization,qubits,solid-state color centers,nitrogen vacancy centers,many-body physics,atom-like emitters
更新于2025-09-16 10:30:52