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arXiv 2024年

作者： Qian, Xiaolong Jiang, Qi Gao, Yao Gao, Shaohua Yi, Zhonghua Sun, Lei Wei, Kai Li, Haifeng Yang, Kailun Wang, Kaiwei Bai, Jian State Key Laboratory of Extreme Photonics and Instrumentation Zhejiang University Hangzhou310027 China School of Robotics Hunan University Changsha410012 China National Engineering Research Center of Robot Visual Perception and Control Technology Hunan University Changsha410082 China

controllable Depth-of-Field (DoF) imaging commonly produces amazing visual effects based on heavy and expensive high-end lenses. However, confronted with the increasing demand for mobile scenarios, it is desirable to achieve a lightweight solution with Minimalist Optical Systems (MOS). This work centers around two major limitations of MOS, i.e., the severe optical aberrations and uncontrollable DoF, for achieving single-lens controllable DoF imaging via computational methods. A Depth-aware controllable DoF Imaging (DCDI) framework is proposed equipped with All-in-Focus (AiF) aberration correction and monocular depth estimation, where the recovered image and corresponding depth map are utilized to produce imaging results under diverse DoFs of any high-end lens via patch-wise convolution. To address the depth-varying optical degradation, we introduce a Depth-aware Degradation-adaptive Training (DA2T) scheme. At the dataset level, a Depth-aware Aberration MOS (DAMOS) dataset is established based on the simulation of Point Spread Functions (PSFs) under different object distances. Additionally, we design two plug-and-play depth-aware mechanisms to embed depth information into the aberration image recovery for better tackling depth-aware degradation. Furthermore, we propose a storage-efficient Omni-Lens-Field model to represent the 4D PSF library of various lenses. With the predicted depth map, recovered image, and depth-aware PSF map inferred by Omni-Lens-Field, single-lens controllable DoF imaging is achieved. To the best of our knowledge, we are the first to explore the single-lens controllable DoF imaging solution. Comprehensive experimental results demonstrate that the proposed framework enhances the recovery performance, and attains impressive single-lens controllable DoF imaging results, providing a seminal baseline for this field. The source code and the established dataset will be publicly available at https://***/XiaolongQian/DCDI. Copyright © 2024, The A

关键词： Optical transfer function

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Sequential combination of pre-chlorination and powdered activated carbon adsorption on iodine removal and I-THMs control in drinking water

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Chemosphere 2023年 313卷 137529页

作者： Pan, Renjie Lin, Yi-Li Zhang, Tian-Yang Wei, Xiu-Li Dong, Zheng-Yu Hu, Chen-Yan Tang, Yu-Lin Xu, Bin State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Department of Safety Health and Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung824 Taiwan College of Environmental and Chemical Engineering Shanghai University of Electric Power Shanghai200090 China

Combining pre-oxidation with activated carbon adsorption was explored as an ideal approach for removing iodine from water source to eliminate the formation of Iodinated trihalomethanes (I-THMs). Compared with permanganate and monochloramine, chlorine is more suitable as pre-oxidant to obtain higher active iodine species (HOI/I2). Active iodine species adsorption using both powdered activated carbon (PAC) and granular activated carbon (GAC) can be well fitted the pseudo-second-order kinetic model indicating that chemical adsorption was the dominant mechanism for HOI/I2 adsorption. The average pore size of activated carbons was the most strongly correlated with the adsorption capacity (R2 > 0.98), followed by methylene blue (R2 > 0.76), pore volume (R2 > 0.70) and iodine number (R2 > 0.67). Moreover, three models, including intraparticle diffusion, Byod kinetic, and diffusion-chemisorption were used to illustrate the mechanisms of HOI/I2 adsorption. Chemical adsorption was the dominant mechanism for HOI/I2 adsorption. In summary, at the molar ratio of [NaClO] and [I−] as 1.2, pre-chloriantion time of 5 min, subsequently dosage of 15 mg/L of PAC E with 20 min adsorption can remove 79.8% iodine. In addition, the combined process can eliminate 61%–87.2% of I-THMs in the subsequent chlor(am)ination. The results indicate that pre-chlorination combined with PAC can effectively removed HOI/I2 and attenuate I-THMs formation in the subsequent disinfection process. © 2022 Elsevier Ltd

关键词： Adsorption

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Deep-Learning-Based Channel Estimation for IRS-Assisted ISAC System

arXiv

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arXiv 2024年

作者： Liu, Yu Al-Nahhal, Ibrahim Dobre, Octavia A. Wang, Fanggang State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China Faculty of Engineering and Applied Science Memorial University St. John'sNLA1B 3X9 Canada

Integrated sensing and communication (ISAC) and intelligent reflecting surface (IRS) are viewed as promising technologies for future generations of wireless networks. This paper investigates the channel estimation problem in an IRS-assisted ISAC system. A deep-learning framework is proposed to estimate the sensing and communication (S&C) channels in such a system. Considering different propagation environments of the S&C channels, two deep neural network (DNN) architectures are designed to realize this framework. The first DNN is devised at the ISAC base station for estimating the sensing channel, while the second DNN architecture is assigned to each downlink user equipment to estimate its communication channel. Moreover, the input-output pairs to train the DNNs are carefully designed. Simulation results show the superiority of the proposed estimation approach compared to the benchmark scheme under various signal-to-noise ratio conditions and system parameters. Copyright © 2024, The Authors. All rights reserved.

关键词： Deep neural networks

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Frustration Elimination and Excited state Search in Coherent Ising Machines

arXiv

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arXiv 2024年

作者： Zhou, Zheng-Yang Gneiting, Clemens You, J.Q. Nori, Franco Zhejiang Key Laboratory of Quantum State Control and Optical Field Manipulation Department of Physics Zhejiang Sci-Tech University Hangzhou310018 China Theoretical Quantum Physics Laboratory Cluster for Pioneering Research RIKEN Wakoshi Saitama351-0198 Japan Center for Quantum Computing RIKEN Wakoshi Saitama351-0198 Japan Zhejiang Key Laboratory of Micro-Nano Quantum Chips and Quantum Control School of Physics State Key Laboratory for Extreme Photonics and Instrumentation Zhejiang University Hangzhou310027 China College of Optical Science and Engineering Zhejiang University Hangzhou310027 China Physics Department The University of Michigan Ann ArborMI48109-1040 United States

Frustration, that is, the impossibility of satisfying the energetic preferences between all spin pairs simultaneously, underlies the complexity of many fundamental properties in spin systems, including the computational difficulty in determining their ground states. Coherent Ising machines (CIMs) have been proposed as a promising analog computational approach to efficiently find different degenerate ground states of large and complex Ising models. However, CIMs also face challenges in solving frustrated Ising models: frustration not only reduces the probability of finding good solutions, but it also prohibits the leveraging quantum effects in doing so. To circumvent these detrimental effects of frustration, we show how frustrated Ising models can be mapped to frustration-free CIM configurations by including ancillary modes and modifying the coupling protocol used in current CIM designs. Such frustration elimination may empower current CIMs to benefit from quantum effects in dealing with frustrated Ising models. In addition, these ancillary modes can also enable error detection and searching for excited states. Copyright © 2024, The Authors. All rights reserved.

关键词： Ising model

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Study on the Interaction Mechanism between Mine Dust and Spray Droplets at the Fine-Scale Level

SSRN

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SSRN 2024年

作者： Liu, Fei Nie, Wen Peng, Huitian Xu, Changwei College of Safety and Environmental Engineering Shandong University of Science and Technology Qingdao266590 China State Key Laboratory of Mining Disaster Prevention and Control Co-found by Shandong Province The Ministry of Science and Technology Shandong University of Science and Technology Qingdao266590 China

The high-concentration dust in coal mine return air tunnels pollutes the underground construction environment and seriously threatens the physical and mental health of coal miners. To solve the problem of the low wetting and wrapping efficiency of dust particles by droplets in the process of spray dust reduction, in this study we first changed the particle size ratio of droplets and dust and the initial velocity of droplets through numerical simulation and simulated the spreading and wetting of droplets under different conditions. The results show that the spread of droplets is closely related to the particle-size ratio and initial velocity. Only when the initial velocity is high and there is an appropriate particle size ratio can the droplets effectively wrap the dust. Through experiments and field verification, under the preferred spray pressure of 8 MPa, we showed that the average dust reduction rate in the return air tunnel could be as high as 88.3%. The results of the study contribute to an in-depth understanding of the mechanisms of dust control in mining environments and provide a feasible engineering approach for improving air quality in the workplace and protecting workers' health. © 2024, The Authors. All rights reserved.

关键词： Drops

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A Novel Trajectory Replanning Method for Autonomous Robots Under Actuator Faults

A Novel Trajectory Replanning Method for Autonomous Robots U...

引用

Fully Actuated System Theory and Applications (CFASTA), Conference on

作者： Fuqiang Liu Cheng Luo Sisindisiwe Nomalanga Ncube Aoshen Li Xiaoshan Bai State Key Laboratory of Mechanical Transmission for Advanced Equipment Chongqing University Chongqing China College of Mechanical and Vehicle Engineering Chongqing University Chongqing China CQU-UC Joint Co-op Institute Chongqing University Chongqing China College of Mechanical and Control Engineering Shenzhen University Shenzhen China

ISBN: (数字)9798350373691

ISBN: (纸本)9798350373707

A novel trajectory replanning method is proposed to solve the path planning problem for autonomous robots under actuator faults which is intended to cooperate with the existing fault-tolerant control of nonlinear systems to ensure autonomous robots' safe and stable operation. This method proposes formulas to estimate and correct remaining time and establishes an optimal time allocation objective function and optimal trajectory coefficient objective function to obtain the replanned trajectory. The simulation results show the method’s effectiveness in the replanned trajectory in the case of actuator faults.

关键词： Actuators Simulation Switches Robot sensing systems Linear programming Trajectory Resource management

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key considerations on the development of biodegradable biomaterials for clinical translation of medical devices:With cartilage repair products as an example

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Bioactive Materials 2022年第3期7卷 332-342页

作者： Li Wang Xiaolei Guo Jiaqing Chen Zhen Zhen Bin Cao Wenqian Wan Yuandong Dou Haobo Pan Feng Xu Zepu Zhang Jianmei Wang Daisong Li Quanyi Guo Qing Jiang Yanan Du Jiakuo Yu Boon Chin Heng Qianqian Han Zigang Ge Department of Biomedical Engineering College of EngineeringPeking UniversityBeijingPR China Center for Medical Device Evaluation National Medical Products AdministrationBeijingPR China Jiangsu DissueTech Medical Technology Co.Ltd|DeJian Group SuzhouPR China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghaiPR China Research Center for Human Tissue and Organs Degeneration Shenzhen Institute of Advanced TechnologyChinese Academy of ScienceShenzhenPR China Bioinspired Engineering and Biomechanics Center(BEBC) MOE Key Laboratory of Biomedical Information EngineeringSchool of Life Science and TechnologyXi’an Jiaotong UniversityXi’anPR China Beijing Institute of Science and Technology Evaluation BeijingPR China Institute of Orthopedics Chinese PLA General HospitalBeijingPR China Department of Sports Medicine and Adult Reconstructive Surgery State Key Laboratory of Pharmaceutical BiotechnologyThe Affiliated Nanjing Drum Tower Hospital of Nanjing University Medical SchoolNanjingPR China Department of Biomedical Engineering School of MedicineTsinghua UniversityBeijingPR China Knee Surgery Department of the Institute of Sports Medicine Beijing Key Laboratory of Sports InjuriesPeking University Third HospitalBeijingPR China School of Stomatology Peking UniversityBeijingPR China National Institutes for Food and Drug Control BeijingPR China Department of Biomedical Engineering Institute of Future TechnologyPeking UniversityBeijingPR China

With the interdisciplinary convergence of biology,medicine and materials science,both research and clinical translation of biomaterials are progressing at a rapid ***,there is still a huge gap between applied basic research on biomaterials and their translational products-medical devices,where two significantly different perspectives and mindsets often work independently and non-synergistically,which in turn significantly increases financial costs and research *** this gap is well-known and often criticized in the biopharmaceutical industry,it is gradually *** this article,we critically examine the developmental pipeline of biodegradable biomaterials and biomaterial-based medical device *** based on clinical needs,market analysis,and relevant regulations,some ideas are proposed to integrate the two different mindsets to guide applied basic research and translation of biomaterial-based products,from the material and technical *** repair substitutes are discussed here as an ***,this will lay a strong foundation for biomaterial research and clinical translation,while reducing the amount of extra research effort and funding required due to the dissonance between innovative basic research and commercialization pipeline.

关键词： Biomaterials Polymer Translation Medical devices Regulation Clinical needs

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Physiological and Morphological Responses of Chlorella Pyrenoidosa to Different Exposure Methods of Graphene Oxide Quantum Dots

SSRN

引用

SSRN 2022年

作者： You, Xiaogang Chen, Can Yang, Libin Xia, Xuefen Zhang, Yalei Zhou, Xuefei College of Environmental Science and Engineering Tongji University Shanghai200092 China State Key Laboratory of Pollution Control and Resource Reuse Shanghai200092 China

The light-emitting properties of graphene oxide quantum dots (GOQDs) can convert the wavelength of light and are being applied to the cultivation of microalgae for biomass production. However, it has not yet found application in large-scale photobioreactor systems due to its high cost and difficulty in recovery. This study proposes a new strategy for the sustainable use of GOQDs by adding GOQDs solutions to the outer sandwich of the reactor isolated from the microalgae. Herein, the effects of direct and indirect exposure methods and concentrations of GOQDs on microalgae biomass accumulation and intracellular fractions were compared. When GOQDs were directly exposed to the microalgae, 100 mg/L GOQDs increased the biomass of microalgae by 24.0%, while 1000 mg/L GOQDs decreased the biomass of microalgae by 31%. Direct exposure of GOQDs at high concentration can cause oxidative stress beyond the carrying capacity of the microalgae and cause a significant reduction in the pigment content within the microalgae to occur. When GOQDs were indirectly exposure, the increased concentration of GOQDs did not inhibit the growth of microalgae. On the contrary, GOQDs at 1000 mg/L increased the microalgae biomass by 14.1% and bioenergy by 40.17% compared to the blank group. The indirect exposure of GOQDs can effectively avoid photo-oxidation and organelle damage caused by direct contact with microalgae. Overall, the indirect exposure of GOQDs can effectively promote the growth of microalgae and can be reused, reducing the application cost of GOQDs for microalgae culture. © 2022, The Authors. All rights reserved.

关键词： Microalgae

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Digital twin and its application in transportation infrastructure 1

Digital twin and its application in transportation infrastru...

引用

1st IEEE International Conference on Digital Twins and Parallel Intelligence, DTPI 2021

作者： Gao, Yan Qian, Shuyue Li, Zihan Wang, Ping Wang, Feiyue He, Qing Southwest Jiaotong University Key Laboratory of High-Speed Railway Engineering Ministry of Education Chengdu China School of Civil Engineering Southwest Jiaotong University Chengdu China Chinese Academy of Sciences The State Key Laboratory of Management and Control for Complex Systems Beijing China Institute of Automation Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781665433372

A prevailing challenge lies in how to properly design, construct and maintain transportation infrastructure engineering. Due to the development of sensor technology and computing technology, the amount of equipment monitoring data has multiplied and it causes difficulties in real-time state assessment and prediction under the traditional modeling condition. The introduction of Digital Twin technology, which aims to reflect the performance of the real-world product by simulating a virtual space, can solve these problems effectively. This paper reviews recent applications of four types of transportation infrastructure: railways, highways, bridges, and tunnels. Also, the existing research gaps are identified. © 2021 IEEE.

关键词： Bridges

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Energy Storage Performance and Dielectric Tunability of Agnbo3 Ferroelectric Film

SSRN

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SSRN 2024年

作者： Li, Da Yao, Yao Wang, Xiaofei Wang, Jing Zhao, Lei College of Physics Science and Technology Hebei University Baoding071002 China Beijing Institute of Metrology Beijing100029 China State Key Laboratory of Mechanics and Control for Aerospace Structures College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China

AgNbO3 ceramics have attracted much attention as environmentally friendly energy storage materials. However, the low energy density limits their further development. In this work, 400 nm AgNbO3 films with dense microstructure and flat surface are prepared by pulsed laser deposition. The dielectric tenability and hysteresis loops reveal the ferroelectric nature of the AgNbO3 films. Dielectric tunability of AgNbO3 films is 63.6% at 600 kV/cm. The breakdown strength of AgNbO3 films reach 1500 kV/cm which contributes to a high recoverable energy density of 13.3 J/cm3. The recoverable energy storage density of AgNbO3 films shows good temperature stability with a variation of less than 10% in the temperature range of 30-150 ℃. These findings suggest that AgNbO3 dielectric film will be potential for energy storage applications. © 2024, The Authors. All rights reserved.

关键词： Thin films

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