期刊：
Journal of Radioanalytical and Nuclear Chemistry,2023年332(9):3733-3740 ISSN：0236-5731
通讯作者：
Liu, L
作者机构：
[Yu, Shiwei; Liu, Lie; Ling, Ke; Liu, L] Univ South China, Sch Elect Engn, Hengyang 421000, Peoples R China.;[Liu, Lie; Zhang, Junze; Han, Lianghua; Liu, L] Univ South China, Sch Mech Engn, Hengyang 421000, Peoples R China.
通讯机构：
[Liu, L ] U;Univ South China, Sch Elect Engn, Hengyang 421000, Peoples R China.;Univ South China, Sch Mech Engn, Hengyang 421000, Peoples R China.
摘要：
A safe and efficient method is necessary for the treatment of high-level liquid waste (HLLW). Therefore, we propose for the first time the use of laser to simulate the glass curing of HLLW. In this paper, borosilicate glasses containing 16% simulated oxides were successfully sintered by laser at different temperatures (1050 & DEG;C-1200 & DEG;C). A series of properties of the obtained cured bodies were analyzed. The results show that the cured body can be prepared above 1100 & DEG;C to meet the requirements. This demonstrates the potential application of lasers in the treatment of HLLW glass curing.
摘要：
Digital microfluidics (DMF) is an innovative technology used for precise manipulation of liquid droplets. This technology has garnered significant attention in both industrial applications and scientific research due to its unique advantages. Among the key components of DMF, the driving electrode plays a role in facilitating droplet generation, transportation, splitting, merging, and mixing. This comprehensive review aims to present an in-depth understanding of the working principle of DMF particularly focusing on the Electrowetting On Dielectric (EWOD) method. Furthermore, it examines the impact of driving electrodes with varying geometries on droplet manipulation. By analyzing and comparing their characteristics, this review offers valuable insights and a fresh perspective on the design and application of driving electrodes in DMF based on the EWOD approach. Lastly, an assessment of the development trend and potential applications of DMF concludes the review, providing an outlook for future prospects in the field.
作者机构：
[Luo, Xiao-Qing; Zhu, Weihua; Xu, Xiaofeng; Liu, Qinke; Chen, Zhiyong; Wang, Xin-Lin] Univ South China, Sch Elect Engn, Hunan Prov Key Lab Ultrafast Micro Nano Technol &, Hengyang 421001, Peoples R China.;[Li, Yan] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Liu, Wuming] Chinese Acad Sci, Inst Phys, Be?ing Natl Lab Condensed Matter Phys, Be?ing 100190, Peoples R China.;[Wang, Xin-Lin] Univ South China, Sch Mech Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Xiao-Qing Luo; Xin-Lin Wang] H;Hunan Province Key Laboratory for Ultra-Fast Micro/Nano Technology and Advanced Laser Manufacture, School of Electrical Engineering, University of South China, Hengyang 421001, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>These authors contributed equally to this work.<&wdkj&>Hunan Province Key Laboratory for Ultra-Fast Micro/Nano Technology and Advanced Laser Manufacture, School of Electrical Engineering, University of South China, Hengyang 421001, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>School of Mechanical Engineering, University of South China, Hengyang 421001, China
摘要：
Fano resonances that feature strong field enhancement in the narrowband range have motivated extensive studies of light–matter interactions in plasmonic nanomaterials. Optical metasurfaces that are subject to different mirror symmetries have been dedicated to achieving nanoscale light manipulation via plasmonic Fano resonances, thus enabling advantages for high-sensitivity optical sensing and optical switches. Here, we investigate the plasmonic sensing and switches enriched by tailorable multiple Fano resonances that undergo in-plane mirror symmetry or asymmetry in a hybrid rotational misalignment metasurface, which consists of periodic metallic arrays with concentric C-shaped- and circular-ring-aperture unit cells. We found that the plasmonic double Fano resonances can be realized by undergoing mirror symmetry along the X-axis. The plasmonic multiple Fano resonances can be tailored by adjusting the level of the mirror asymmetry along the Z-axis. Moreover, the Fano-resonance-based plasmonic sensing that suffer from mirror symmetry or asymmetry can be implemented by changing the related structural parameters of the unit cells. The passive dual-wavelength plasmonic switches of specific polarization can be achieved within mirror symmetry and asymmetry. These results could entail benefits for metasurface-based devices, which are also used in sensing, beam-splitter, and optical communication systems.
通讯机构：
[He, HY ] U;Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;Peking Univ, Sch Elect & Comp Engn, Shenzhen Grad Sch, Shenzhen 518005, Peoples R China.;Guangdong Univ Technol, Sch Automation, Guangzhou 510006, Peoples R China.
关键词：
Drain current model;Temperature characteristics;Thin-film transistor (TFT);Trap states
摘要：
A new analytical surface-potential-based drain current model is presented for the organic thin-film transistors (TFTs) when carriers are confined in two dimensions. Following the carrier multiple trapping and release (MTR) conduction theory, i.e., the assumption that the trapped carrier concentration is much higher than the free carrier concentration, the model is developed. The presented model can account for the linear regime and saturation regime by a single formulation. The calculated results of the presented model are verified by the available experimental drain current considering the temperature characteristics. Comparing with the previous model using the variable range hopping and percolation (VRH) conduction theory, although the presented model and the previous model are similar in mathematics, the presented model is more efficient to estimate the density of trap states for the organic TFTs.
摘要：
A hybrid system with jointed battery and PEMFC is popular and of great potential in New Energy Vehicle (NEV) application. However, reliability and efficiency remain to be improved for commercial products. To reflect the complicated physics inside the proton exchange membrane fuel cell (PEMFC), the PEMFC model consisting of inner muti-physics process and other accessories was built, then a complete hybrid system was established when a matched battery, DC/DC, regenerative braking were taken into consideration. Based on the above model, the stack state and system performance under standard cycle for heavy duty vehicleCWTVC were obtained. According to the simulation results, fuel cell states such as pressure, water content and voltage suffers severe oscillation with external load, especially in the highway cycle. Membrane electrode assembly (MEA) suffers from pressure impact with average value of more than 24 kPa in highway cycle. In the aspect of relative humidity, the PEMFC stack is most threatened in road cycle. As for the hybrid system, its efficiency and state of charge (SOC) fluctuation perform worst in urban cycle and road cycle respectively, while its highest efficiency occurs in road test. Operating mode of fuel cell has influence on hybrid system. When 3-level mode of fuel cell output was applied, the efficiency increased to its peak value at medium level of 28 kW and then declined gradually. H2 consumption had an opposite trend compared to efficiency. In the aspect of battery SOC, it declines in operating process and its fluctuations decreases when medium level got bigger. The 3-level mode and 4-level mode were compared using this model. It can be concluded that although 3-level mode performs slightly better in hybrid system efficiency, H2 consumption, pressure impact, it does not have absolute advantage over 4-level mode in other indicators. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
作者：
Pang, Lihui;Tang, Yilong;Tan, Qingyi;Liu, Yulang;Yang, Bin
期刊：
EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING,2022年2022(1):1-25 ISSN：1687-6180
通讯作者：
Pang, Lihui(sunshine.plh@hotmail.com)
作者机构：
[Tan, Qingyi; Tang, Yilong; Yang, Bin; Pang, Lihui; Liu, Yulang] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Pang, Lihui] Sungkyunkwan Univ, Dept Software, Suwon 440746, South Korea.
通讯机构：
[Lihui Pang] S;School of Electrical Engineering, University of South China, Hengyang, China<&wdkj&>Department of Software, Sungkyunkwan University, Suwon, South Korea
关键词：
Blind signal separation;Kernel density estimation;Maximum likelihood estimation;Neural networks;Time–frequency overlapped signal
摘要：
The blind signal separation (BSS) algorithm obtains each original/source signal from the observed signal collected by the receiving antenna or sensor. Objective/loss/cost function and optimization method are two key parts of BSS algorithm. Modifying the objective function and optimization from the perspective of neural network (NN) is a novel concept in BSS domain.
$$L_2$$
regularization is adopted as a term of maximum likelihood estimation (MLE)-based objective function like in Liu et al.(Sensors 21(3):973, 2021); however, we modified the probability density function (PDF) term of the objective function and used the kernel density estimation method for time–frequency overlapped digital communication signal. Multiple optimizers are studied in this paper, and we figure out the right optimizer for our application scenario. A varies of comparison experiments—whoseseparation results will be providedinforms of correlation coefficient and performance index—are carried out, which indicate our method can converge quickly and achieve satisfactory separation results with performance index (PI) lower than 0.02 when signal-to-noise ratio (SNR) no less than 10dB. Additionally, it demonstrates performance of our method is better than that of typical separation—FastICA, especially for the lower SNR environment, and it shows that our method is not sensitive to the frequency overlap level (FOL) of the source signal, even FOL as high as
$$100\%$$
; it still can get high-precision separation results with
$$\textrm{PI}<0.02$$
.
关键词：
6G;6G mobile communication;Confident Information Coverage Model(CIC);Energy consumption;Green IoT;Green products;Internet of Things;Monitoring;Network Lifetime;Reinforcement Learning;Sensors;Sleep Scheduling;Uranium
摘要：
The Internet of Things (IoT) enabled by 6G increases the number of devices and users exponentially. 6G IoT will cover the overall domain of the world. Due to the limited resources in the IoT environment, greener and smarter networks are indispensable for the sustainable development of the 6G IoT. In this paper, the issue of improving resource efficiency and extending network lifetime is studied. We propose a novel Confidence Information Coverage (CIC) node sleep scheduling algorithm based on reinforcement learning (CICRL). In CICRL, collaborative intelligence is achieved through Q-learning to meet the coverage rate with the least active nodes, thus balancing the energy consumption and prolonging the network lifetime. Compared with the Coordination Algorithm based on Reinforcement Learning (COORD), Low-Energy Adaptive Clustering Hierarchy (LEACH) and Sleep Scheduling Approach based on Learning Automata (PCLA), the simulation results demonstrate that the proposed algorithm satisfies coverage with fewer active nodes and improves the network lifetime substantially.
期刊：
PHYSICS OF PLASMAS,2022年29(8):082502 ISSN：1070-664X
通讯作者：
Jinjia Cao
作者机构：
[Zhao, Jianhua; Xiang, Dong; Yang, Junhui; Cao, Jinjia; Dai, Yongzhi] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Yang, Wenjun] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Jinjia Cao] S;School of Nuclear Science and Technology, University of South China , Hengyang 421001, People's Republic of China
摘要：
The enhanced transport of trapped energetic ions (TEIs) in the presence of resonant interactions between trapped fast ions and a rotating magnetic island is investigated within a drift-kinetic framework. Gyro-orbit banana center model equations of resonances between the island rotation, the bounce motion of trapped fast ions, and their precession frequency (poloidal precession and precession in the helical direction) are constructed. There are two solutions for resonances in phase space for different mode numbers, with only one solution having low-energy resonant lines (< 100 keV); the other has not only low-energy resonant lines but also high-energy lines (< 100 keV). Island rotation plays an important role in the low-energy region, especially near the trapped-passing boundary. The precession frequency is more important when resonances occur in the high-energy area. Thus, the effect of islands on TEI transport in a low-energy region is the focus of this paper. Transport fluxes caused by collisions, resonances, and symmetry breaking induced by an island are obtained. We divide transport fluxes into two types: gamma(c) arising from magnetic drift and gamma(b) arising from the island rotation. There is a discontinuity in gamma(c) with different island widths near the island separatrix. On the right-hand side of the (m = 2, n = 1) rational surface, gamma(c) is more important than gamma(b), and at the plasma boundary, the flux due to drift can suppress gamma(b), which makes fast ions move toward inner plasma. On the left-hand side of the rational surface, gamma(b) is dominant. When the island width is larger than a certain threshold, the fluxes oscillate, and & UGamma; b is far larger than gamma(c).
摘要：
Quantum interference effects in the unmodulated quantum systems with light-matter interaction have been widely studied, such as electromagnetically induced transparency (EIT) and Autler-Townes splitting (ATS). However, the similar quantum interference effects in the Floquet systems (i.e., periodically modulated systems), which might cover rich new physics, were rarely studied. In this article, we investigate the quantum interference effects in the Floquet two- and three-level systems analytically and numerically. We show a coherent destruction tunneling effect in a lotuslike multipeak spectrum with a Floquet two-level system, where the intensity of the probe field is periodically modulated with a square-wave sequence. We demonstrate that the multipeak split into multiple transparency windows with tunable quantum interference if the Floquet system is asynchronously controlled via a third level. Based on phenomenological analysis with Akaike information criterion, we show that the symmetric central transparency window has a similar mechanism to the traditional ATS or EIT depending on the choice of parameters, additional with an extra degree of freedom to control the quantum interference provided by the modulation period. The other transparent windows are shown to be asymmetric, different from the traditional ATS and EIT windows. These nontrivial quantum interference effects open up a scope to explore the applications of the Floquet systems.
摘要：
Visual inspection techniques for rail surface defects have become prevalent approaches to obtain information on rail surface damage. However, uneven illumination leads to illegibility of local information, and the change of the wheel-rail area results in the changeful background of the rail surface, both of which pose challenges to the visual inspection. This paper proposes a novel algorithm that detects rail surface defects via partitioned edge features (PEF). PEF eliminates the effect of uneven illumination by effectively extracting edge features and building homogeneous background on the rail surface. In the process of edge feature extraction, the thresholding based on adaptive partition of rail surface (APRS) plays an indispensable role. In APRS, the rail surface is adaptively partitioned into three types of regions according to the wheel-rail contact degree. After that, the dynamic threshold is set adaptively for each region type on the basis of the prior information of defect proportion. Subsequently, based on neighborhood information and fuzzy decision, the spatial information of adjacent pixels and the direction information of fracture edges are utilized to realize the effective recovery of incomplete defect contours. In addition, defect contours are precisely filled via a flexible combination of morphological hole filling operation and defect region extraction based on improved background difference. The accuracy of this PEF algorithm was confirmed by experiments and comparisons with related algorithms. The experiment results show that PEF detects defects with 92.03% recall and 88.49% precision, which achieves higher accuracy than the established detection algorithms for rail surface defects.
摘要：
Network lifetime and coverage are the key evaluation metrics of Wireless Sensor Networks (WSNs). Aiming at network lifetime, Hierarchical Clustering-task Scheduling Policy (HCSP) breaks the traditional clustering framework, but it doesnt fully consider the network coverage problem. We propose a Hierarchical Clustering Node Collaborative Scheduling (HCNCS) protocol that optimizes HCSP to extend the network lifetime and improves the coverage performance of WSNs by nodes collaborative sensing. According to the deployment location, HCNCS classifies nodes into Node Collaborative Sensing Disks(NCSDs), which as units for data sensing and transmission. Nodes are rotated in WSNs to balance the energy consumption and through collaborative sensing to improve the coverage of NCSDs. In addition, HCNCS constrains the number of clusters by NCSDs classification based on K-means to reduce the communication energy consumption of clustering. Based on the HCNCS, this paper further proposes an Enhanced Hierarchical Clustering Node Collaborative Scheduling (EHCNCS) protocol. Compared with HCNCS, EHCNCS selects NCSDs according to Node Collaborative Scheduling (NCS) algorithm after clustering, which improves the coverage capability of NCSDs at the cost of increasing a small amount of the communication energy consumption. EHCNCS also rotates Cluster Heads (CHs) by the CH rotation candidate table to balance network energy consumption. The extensive simulations show that HCNCS has an obvious advantage over HCSP in terms of network lifetime and network coverage. Compared with HCNCS, EHCNCS significantly prolongs the network lifetime of WSNs at the expense of a bit of coverage performance.
