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Cleaning of two mirrors in the first mirror unit using radiofrequency capacitively coupled plasma

Plasma science and Technology 2024年第9期26卷 165-171页

作者： Chenxue WANG Rong YAN Yuming LIU Su XU Lei MU Wei ZHENG Rui DING Junling CHEN Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China School of Computer Engineering Anhui Sanlian UniversityHefei 230601People’s Republic of China

First mirror(FM)cleaning,using radio frequency(RF)plasma,has been proposed to recover FM reflectivity in nuclear fusion reactors such as the International Thermonuclear Experimental Reactor(ITER).To investigate the influence of simultaneous cleaning of two mirrors on mirror cleaning efficiency and uniformity,experiments involving single-mirror cleaning and dual-mirror cleaning were conducted using RF capacitively coupled plasma in the *** the test and simultaneous cleaning of two mirrors,the FM and second mirror(SM),both measuring 110 mm×80 mm,were placed inside the first mirror unit(FMU).They were composed of 16 mirror samples,each with a dimension of 27.5 mm×20 *** mirror samples consist of a titanium-zirconium-molybdenum alloy substrate,a 500 nm Mo intermediate layer and a 30 nm Al_(2)O_(3) surface coating as a proxy for Be *** cleaning of a single first mirror(SFM)and the simultaneous cleaning of the FM and SM(DFM and DSM)lasted for 9 h using Ar plasma at a pressure of 1 *** total reflectivity of mirror samples on the DSM did not fully recover and varied with location,with a self-bias of−140 *** a self-bias of−300 V,the total reflectivity of mirror samples on the SFM and DFM was fully *** energy dispersive spectrometer results demonstrated that the Al_(2)O_(3) coating had been completely removed from these mirror ***,the mass loss of each mirror sample on the SFM and DFM before and after cleaning varied depending on its location,with higher mass loss observed for mirror samples located in the corners and lower loss for those in the *** with SM cleaning,the simultaneous cleaning of two mirrors reduced the difference between the highest and lowest mass ***,this mass loss for the mirror samples of the DFM facing the DSM was *** indicated that mirror samples cleaned face to face in the FMU simultaneously could influence each other,highlighting the need for special attention in

关键词： first mirror unit dual-mirror cleaning reflectivity sputtering rate

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Innovative Approaches to Task Scheduling in Cloud Computing Environments Using an Advanced Willow Catkin Optimization Algorithm

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computers, Materials & Continua 2025年第2期82卷 2495-2520页

作者： Jeng-Shyang Pan Na Yu Shu-Chuan Chu An-Ning Zhang Bin Yan Junzo Watada College of Computer Science and Engineering Shandong University of Science and TechnologyQingdao266590China Department of Information Management Chaoyang University of TechnologyTaichung41349Taiwan College of Electronics Communication and PhysicsShandong University of Science and TechnologyQingdao266590China Graduate School of Information Production and SystemsWaseda UniversityKitakyushu808-0135Japan

The widespread adoption of cloud computing has underscored the critical importance of efficient resource allocation and management, particularly in task scheduling, which involves assigning tasks to computing resources for optimized resource utilization. Several meta-heuristic algorithms have shown effectiveness in task scheduling, among which the relatively recent Willow Catkin Optimization (WCO) algorithm has demonstrated potential, albeit with apparent needs for enhanced global search capability and convergence speed. To address these limitations of WCO in cloud computing task scheduling, this paper introduces an improved version termed the Advanced Willow Catkin Optimization (AWCO) algorithm. AWCO enhances the algorithm’s performance by augmenting its global search capability through a quasi-opposition-based learning strategy and accelerating its convergence speed via sinusoidal mapping. A comprehensive evaluation utilizing the CEC2014 benchmark suite, comprising 30 test functions, demonstrates that AWCO achieves superior optimization outcomes, surpassing conventional WCO and a range of established meta-heuristics. The proposed algorithm also considers trade-offs among the cost, makespan, and load balancing objectives. Experimental results of AWCO are compared with those obtained using the other meta-heuristics, illustrating that the proposed algorithm provides superior performance in task scheduling. The method offers a robust foundation for enhancing the utilization of cloud computing resources in the domain of task scheduling within a cloud computing environment.

关键词： Willow catkin optimization algorithm cloud computing task scheduling opposition-based learning strategy

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Student-Informed Technology Adoption in Higher Education of Developing Countries

Student-Informed Technology Adoption in Higher Education of ...

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2023 International Conference on Information Network and computer Communications, INCC 2023

作者： Kankia, Yasir Bashir Che, Xianhui Ip, Barry Ji, Wei University of Hertfordshire School of Physics Engineering and Comouter Science Hatfield United Kingdom Queen Mary University of London School of Electronic Engineering and Computer Science London United Kingdom

ISBN: (纸本)9798350336139

As traditional information technology systems become more costlier and complex to maintain, they are also no longer able to meet current educational requirements, notwithstanding issues with the lack of scalability and flexibility. Many of these issues can be addressed by the concept of Student-Informed Technology and a newly-proposed comprehensive technology readiness adoption (CTRAM) model. The five central components of CTRAM were assessed at six different universities in Nigeria which comprises of three public/Government-funded universities and three private-owned universities. The result of the study confirmed that subjective norms of students evidence a statistically significant relationship with student perceptions of cloud technology adoption in higher educational institutions in the country. All five CTRAM components: perceived innovation, perceived usefulness, perceived easiness, attitude toward technology and perceived reliability are statistically significant as a technological factor in determining students' perception of cloud technology adoption. Results from multiple regression also clearly indicate the potential joint effect among all five factors. These findings support the existing body of knowledge regarding technological adoption in the educational sector, especially in developing countries towards their future investment and improvement. © 2023 IEEE.

关键词： Students

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Multiphoton Resonance Meets Tunneling Ionization: High-Efficient Photoexcitation in Strong-Field-Dressed Ions

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Physical Review Letters 2024年第11期133卷 113201页

作者： Yewei Chen Hongbin Lei Quanjun Wang Hongqiang Xie He Zhang Xu Lu Ning Zhang Shunlin Huang Yuzhu Wu Jianpeng Liu Qian Zhang Yi Liu Zengxiu Zhao Jing Zhao Jinping Yao State Key Laboratory of High Field Laser Physics School of Optical-Electrical and Computer Engineering Department of Physics School of Science Center of Materials Science and Optoelectronics Engineering School of Microelectronics

Tunneling ionization, a fascinating quantum phenomenon, has played the key role in the development of attosecond physics. Upon absorption of a few tens of photons, tunneling ionization creates ions in different excited states and even enables the formation of population inversion between ionic states. However, the underlying physics is still being debated. Here, we demonstrate a significant enhancement in the efficiency of multiphoton excitation when ionization of neutral molecules and resonant excitation of ions coexist in strong laser fields. It facilitates the dramatic increase in population inversion and lasing radiation in N2+ around 1000 nm pump wavelength. Utilizing the ionization-coupling theory, we discover that the synergistic interplay between tunneling ionization and multiphoton excitation enables the ionic coherence to be maximized by phase locking of the periodically created ionic dipoles and consistently maintain an optimal phase for the follow-up photoexcitation. This Letter provides new insights into the photoexcitation mechanism of ions in strong laser fields and opens up a route for optimizing ionic lasing radiations.

关键词： Multiphoton or tunneling ionization & excitation Optical transient phenomena Stark effect Ultrafast phenomena

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A High-Precision Generality Method for Chinese Nested Named Entity Recognition 18th

A High-Precision Generality Method for Chinese Nested Named...

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18th International Conference on Wireless Artificial Intelligent Computing Systems and Applications, WASA 2024

作者： Ji, Xiayan Chen, Lina Gao, Hong Shen, Fangyao Guo, Hongjie College of Physics and Electronic Information Engineering Zhejiang Normal University Jinhua China School of Computer Science and Technology Zhejiang Normal University Jinhua China

ISBN: (纸本)9783031714696

Chinese Named Entity Recognition (CNNER) faces numerous challenges, including the diversity of the Chinese language, the complex representation of mixed Chinese and English characters and symbols in texts, the complexity of the Chinese language itself with long sentences containing multiple entities, and the uneven distribution of named entity classes in actual Chinese scenarios. To address these challenges, we propose a method called CPMFA (Character Pair-based method with Multi-feature representation and Attention mechanism). The CPMFA method predicts predetermined relations between character pairs, facilitating the identification of nested named entities based on these relations. Firstly, the method leverages the pre-trained language model LERT (Linguistically-motivated Bidirectional Encoder Representation from Transformer) and BiLSTM (Bidirectional Long Short-Term Memory) to generate comprehensive and accurate character embeddings. Secondly, it incorporates multi-feature representation to capture complex semantic information and introduces the Pyramid Squeeze Attention (PSA) module to emphasize key features. Finally, the PolyLoss function is integrated into the model training process to tackle the challenge of an imbalanced distribution of entity classes. We employed the DiaKG, Yidu-S4K and Weibo datasets to validate and evaluate the efficacy and adaptability of our method. The F1 obtained by the CPMFA on these three datasets is 83.79%, 72.03%, and 70.39%, in that order. The experimental results illustrate the outstanding performance of the proposed CPMFA method in both general knowledge and Chinese medical domains. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Semantics

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TRUE: A Correlation Analysis Approach for Conducting Optimal Routing Metrics in VANETs

IEEE Networking Letters

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IEEE Networking Letters 2023年第1期5卷 55-58页

作者： Bi, Zhenguo Meng, Guiying Hawbani, Ammar Goudos, Sotirios K. Wan, Shaohua Zhao, Liang Shenyang Aerospace University School of Computer Science Shenyang110136 China University of Electronic Science and Technology of China School of Computer Science and Engineering Chengdu611731 China University of Science and Technology of China School of Computer Science and Technology Hefei360022 China Aristotle University of Thessaloniki ELEDIA@AUTH Department of Physics Thessaloniki54124 Greece Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen518110 China

In vehicular networks, especially in urban scenarios, road topology-based routing shows great advantages in dealing with the problems of broken links and long delays originating from sparse connections and signal attenuation. However, how road status affect data transmission performance on various routing metrics is still an intricate and vague problem. Concerned with this problem, we propose a correlation analysis approach between road network features and routing metrics (TRUE) to assist in the construction of optimal routing metrics in road-based hierarchical inter-vehicle routing. Simulation results show that TRUE has a strong ability to optimize intermediate road selection. © 2019 IEEE.

关键词： Vehicle routing

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Geometric discord of tripartite quantum systems

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Chinese physics B 2023年第11期32卷 184-190页

作者：熊春河齐文韬缪茂可吴明晖 Interdisciplinary Center for Quantum Information School of PhysicsZhejiang UniversityHangzhou 310027China School of Computer and Computing Science Hangzhou City UniversityHangzhou 310015China School of Mathematical Sciences Zhejiang UniversityHangzhou 310027China School of information and electrical engineering Hangzhou City UniversityHangzhou 310015China

We study the quantification of geometric discord for tripartite quantum ***,we obtain the analytic formula of geometric discord for tripartite pure *** is already known that the geometric discord of pure states reduces to the geometric entanglement in bipartite systems,the results presented here show that this property is no longer true in tripartite ***,we provide an operational meaning for tripartite geometric discord by linking it to quantum state discrimination,that is,we prove that the geometric discord of tripartite states is equal to the minimum error probability to discriminate a set of quantum states with von Neumann ***,we calculate the geometric discord of three-qubit Bell diagonal states and then investigate the dynamic behavior of tripartite geometric discord under local *** is interesting that the frozen phenomenon exists for geometric discord in this scenario.

关键词： geometric discord tripartite quantum systems quantum state discriminations frozen discord

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Single-shot phase retrieval for randomly fluctuated and obstructed vortex beams

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science China(physics,Mechanics & Astronomy) 2024年第4期67卷 72-80页

作者： Hao Zhang Jun’an Zhu Xingyuan Lu Zhiquan Hu Jianbo Gao Kun Liu Qiwen Zhan Yangjian Cai Chengliang Zhao School of Physical Science and Technology Soochow UniversitySuzhou 215006China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shandong Provincial Engineering and Technical Center of Light Manipulations Shandong Provincial Key Laboratory of Optics and Photonic DeviceSchool of Physics and ElectronicsShandong Normal UniversityJinan 250358China Joint Research Center of Light Manipulation Science and Photonic Integrated Chip of East China Normal University and Shandong Normal University East China Normal UniversityShanghai 200241China

Vortex beams with orbital angular momentum play a crucial role in increasing the information capacity in optical *** magnitude of orbital angular momentum determines the ability of information *** practice,a vortex beam can encounter random objects or turbulence during free-space propagation,resulting in information ***,accurately measuring the orbital angular momentum of a randomly fluctuated and obstructed vortex beam is a considerable ***,we propose a single-shot method for the phase retrieval of a randomly fluctuated and obstructed vortex beam by combining the phase-shift theorem and self-reference *** results reveal that the sign and magnitude of the initial orbital angular momentum can be simultaneously determined based on their quantitative relation with the number of coherence singularities on the observation plane,thus addressing the effects of random occlusion and atmospheric *** proposed method considerably improved the accurate decoding of orbital angular momentum information in nonideal freespace optical communications.

关键词： optical vortex phase retrieve orbital angular momentum measurement antiturbulence antidisturbance

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ETDA a tool for the development of e-Tongues

ETDA a tool for the development of e-Tongues

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2023 International Young Engineers Forum in Electrical and computer engineering, YEF-ECE 2023

作者： Reis, Tiago Fino, M. Helena Raposo, Maria Nova School of Science and Technology Department of Electrotechnical and Computer Engineering Caparica Portugal Department of Physics Caparica Portugal

ISBN: (纸本)9798350300420

This paper presents the Electronic Tongues Data Analytics (ETDA) tool for automatically extracting the relevant features from data obtained from an electronic tongue (e-Tongue) system based on impedance spectroscopy measurements. The tool was implemented in Python and was created to assist with the development of e-Tongues. This tool helps to quickly visualize the data from the experiments and can automatically create and calibrate the Principal Components Analysis (PCA) to fit the concentrations of a determined molecule present in the complex media. © 2023 IEEE.

关键词： Principal component analysis

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Numerical study on matching conditions of Langmuir parametric instability and the formation of Langmuir turbulence in ionospheric heating

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Earth and Planetary physics 2022年第5期6卷 474-486页

作者： MoRan Liu Chen Zhou Ting Feng Xiang Wang ZhengYu Zhao Department of Space Physics School of Electronic InformationWuhan UniversityWuhan 430072China School of Computer Science and Information Engineering Hubei UniversityWuhan 430011China

Parametric decay instability(PDI)is an important process in ionospheric *** paper focuses on the frequency and wavevector matching condition in the initial PDI process,the subsequent cascade stage,and the generation of strong Langmuir turbulence.A more general numerical model is established based on Maxwell equations and plasma dynamic equations by coupling highfrequency electromagnetic waves to low-frequency waves via ponderomotive *** primary PDI,cascade process,and strong Langmuir turbulence are excited in the *** matching condition in the initial PDI stage and cascade process is *** result indicates that the cascade ion acoustic wave may induce or accelerate the formation of cavitons and lead to the wavenumber spectrum being more enhanced at 2k_(L)(where k_(L) is the primary Langmuir wavenumber).The wavenumber spectra develop from discrete to continuous spectra,which is attributed to the caviton collapse and strong Langmuir turbulence.

关键词： ionospheric electromagnetic propagation parametric decay instability cascade Langmuir turbulence

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