通讯机构：
[Li, Yuehua] U;Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
关键词：
Pixel circuit;Threshold voltage variation;Mobility variation;Thin-film transistor (TFT)
摘要：
A pixel circuit is presented for active-matrix organic light-emitting diode (AMOLED) displays. The circuit contains five thin-film transistors (TFTs) and one capacitor (5T1C). In the circuit, by decreasing the driving TFT's source voltage, the mobility-related discharge voltage is obtained. By inputting the data voltage in the programming stage, the circuit can compensate both threshold voltage variation and mobility variation using only one capacitor. Meanwhile, the circuit can prevent the current from flowing into the OLED when the OLED is not operated in the emission stage to prevent the image flicker. The circuit simulation results show that the OLED current error rate is lower than 5.7% when the threshold voltage varies +/- 0.5 V, the error rate is lower than 5.5% when the mobility varies +/- 30% and the data voltage is above 0 V.
期刊：
Review of Scientific Instruments,2021年92(1):014706-1-014706-6 ISSN：0034-6748
通讯作者：
Chen, Wenguang
作者机构：
[Rao, Yihua] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Du, Jia; Chen, Wenguang] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Chen, Wenguang] U;Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
摘要：
A solid-state suppress grid power supply (SGPS) is developed to be applied to the 5 MW level neutral beam injection (NBI) on HL-2M Tokamak. The power supply consists of ten modules in series, with an index of 560 V/40 A. Each of the modules is composed of an isolated transformer, rectifier, filter tank, insulated gate bipolar transistor switch, gate-drive circuit, free-wheeling diode, and so forth. An embedded system STM32F103 is used for controlling and protecting the SGPS. Meanwhile, the transient output capacity of the SGPS is tested. The effect of the output voltage of the SGPS on the extracted beam current is studied. The experimental results show that there is a turning point in the relationship between the suppress voltage and the extracted beam current. When the rate of the absolute value of the suppress voltage and the gradient voltage is more than 2.5%, the efficiency of the extracted beam of the ion source can be improved. Compared with the previous types of equipment of the NBI system, the extracted beam success rate of the new SGPS increased by more than 20%. The SGPS meets the requirements of the NBI system.
作者：
Chen, Xue-Kun;Hu, Xiao-Yan;Jia, Peng;Xie, Zhong-Xiang;Liu, Jun
期刊：
International Journal of Mechanical Sciences,2021年206:106576 ISSN：0020-7403
通讯作者：
Zhong-Xiang Xie<&wdkj&>Jun Liu
作者机构：
[Chen, Xue-Kun; Jia, Peng; Liu, Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Hu, Xiao-Yan] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Xie, Zhong-Xiang] Hunan Inst Technol, Dept Math & Phys, Hengyang 421002, Peoples R China.
通讯机构：
[Zhong-Xiang Xie] D;[Jun Liu] S;Department of Mathematics and Physics, Hunan Institute of Technology, Hengyang 421002, China<&wdkj&>School of Mathematics and Physics, University of South China, Hengyang 421001, China
摘要：
Carbon foams (CFs) possess high storage capacity, good electronic conductivity and superb mechanical strength, which demonstrate promising applications in many engineering fields. Understanding thermal transport in CFs is critical for the design and reliability of functional electronic devices based on them. In this work, we systematically study anisotropic thermal transport in the CFs composed of sixfold-wing graphene nanoribbons by using equilibrium molecular dynamics simulations. The results showed that the remarkable anisotropic behavior reflecting geometric anisotropy can be attributed to the orientation-dependent group velocity of long wavelength phonons. Moreover, it is found that the anisotropic ratio could be effectively regulated by compress/tensile strains. Detailed spectral analysis revealed that the loading of strain would significantly modify the coupling level between the transverse and longitudinal vibrational modes, resulting in a change to the anisotropic ratio. For thermal management application, the interfacial thermal conductance (TBC) of CFs/silicon substrate is predicted to be about 35 MW/m(2) K-1, which is comparable to the TBC of the transferred metal films on silicon or SiO2 substrates. Furthermore, the TBC could be further enhanced by increasing ambient temperature or external stress. Our results might provide guidance for the development of thermal interfacial materials and thermal channeling devices.
摘要：
Whispering-gallery modes (WGMs), confining the resonant photons in nanoscale volumes, have been known to exhibit high-quality factor and sensitivity for electromagnetic waves in the field of nanophotonics. Here, we numerically demonstrate that a metasurface, which consists of periodic arrays with concentrically hybrid rectangular-slot (RS) and circular-ring-aperture (CRA) unit cells, supports polarization-dependent plasmonic sensing and switching in the visible and near-infrared regions. In particular, it is shown that the magnetic plasmon-induced transparency (PIT) effect arises from the coupling between a wideband WGM resonance and a narrowband magnetic dipole resonance mode in the hybrid metasurface. It is of great interest to find that the resonance mode broadening and mode shift sensing can be realized by varying the polarization angle of incident light and the length of the RS structure, respectively. Moreover, a novel and easy-fabricated plasmonic switching can be implemented in the visible and near-infrared regions. By changing the inner radius of the CRA structure, we reveal that the operating wavelength of the plasmonic switching can be extended to the telecom O- or E-band with an optimal ON/OFF ratio being 18.35 dB. Our results provide a path toward designing compact and tunable PIT device and could expand the application range of subwavelength nanostructures to the realm of optical communications and information process.
作者：
Bin, B.;Lyu, B.;Yang, Y.;Zhang, H. M.;Hao, Q. W.;...
期刊：
Review of Scientific Instruments,2021年92(6):063512 ISSN：0034-6748
通讯作者：
B. Lyu
作者机构：
[Hao, Q. W.; Lyu, B.; Zhang, H. M.; Wang, F. D.; Dai, C.; Li, J.; Li, Y. Y.; Bin, B.; Fu, J.] Chinese Acad Sci, HFIPS, Inst Plasma Phys, Hefei 230031, Peoples R China.;[Bin, B.] Univ Sci & Technol China, Grad Sch, Sci Isl Branch, Hefei 230026, Peoples R China.;[Bin, B.] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Yang, Y.] Fudan Univ, Inst Modern Phys, Shanghai 200433, Peoples R China.;[Du, X. W.; Wang, Q. P.] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China.
通讯机构：
[B. Lyu] I;Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences , Hefei 230031, China
摘要：
Spectroscopic diagnostics of future fusion reactor plasmas require information on impurity line emissions, especially for relevant high-Z metal elements (e.g., tungsten). These materials will be widely used as plasma facing components for their high heat tolerance and low sputtering yield. Based on an electron beam ion trap, a compact impurity spectra platform is developed to mimic the high-temperature environment of a fusion reactor. The proposed platform can deliver a focused e-beam at energies over 30 keV using a confining magnetic field of ∼1.0 T generated by two superconducting coils (NbTi). Cooled by a closed-loop cryocooler, the coils can avoid the usage of a complicated cryogenic system involving the handling of liquid helium. For spectroscopic studies of highly charged ions, a spherically curved crystal spectrometer is proposed to measure a wavelength range around 2–4 Å covering the typical wavelength range expected to be emitted by metal ions in a fusion plasma. This paper reports the design and development progress of the platform.
关键词：
Bridges;Monitoring;Computer science;Sensors;Learning automata;Internet of Things;Civil engineering;Bridge structural health monitoring (BSHM);confident information coverage (CIC) model;Internet of Things (IoT);learning automata (LA);partial coverage;reinforcement learning
摘要：
Internet-of-Things (IoT)-based bridge structural health monitoring (BSHM) has recently attracted considerable attention from both academic and industrial communities of civil engineering and computer science. In conjunction with researchers from civil engineering and computer science, this article studied a fundamental problem motivated from practical IoT-based BSHM: how to effectively prolong network lifetime while guaranteeing desired coverage. Integrating a promising reinforcement learning model named learning automata (LA) with confident information coverage (CIC) model, this article presented an energy-efficient sensor scheduling strategy for partial CIC coverage in IoT-based BSHM system to guarantee network coverage and prolong network lifetime. The proposed scheme fully exploits cooperation among deployed nodes and alternatively schedules the wake/sleep status of nodes while satisfying network connectivity and partial coverage ratio. Especially, the proposed scheme takes full advantage of the LA model to adaptively learn the optimal sensor scheduling strategy and significantly extend network lifetime. A series of comparison simulations using real data sets collected by a practical BSHM system strongly verify the effectiveness and energy efficiency of the proposed algorithm. To the best of our knowledge, this is the first study on how to combine the reinforcement learning mechanism with partial coverage for maximizing the network lifetime of the IoT-based BSHM.
摘要：
The aim of infrared and visible image fusion is to generate a composite image that contains the thermal radiation information in the infrared image and optical spectral information in visible image. In this paper, we proposed an end-to-end deep infrared and visible image fusion network which has the capability of information retention and feature transmission. In our proposed network, residual dense blocks (RDB) are introduced to ensure complete deep features extraction of source images. We also design intermediate feature transmission blocks to avoid information loss caused by convolution. In addition, we constrain the network by a comprehensive loss function based on image intensity, gradients, and structure similarity. The loss function ensures that the fused images retain rich details. We introduce weight blocks to produce adaptive weights to control the retention of similar information in two source images, which can reduce the intermediate information loss and play the role of information retention. Extensive experiments on both public TNO and RoadScene datasets are conduced to test the performances of the proposed method. Related ablation experiments are conducted to investigate the validation of the weight blocks and the feature transmission blocks. The experimental results demonstrate that the fusion results of the proposed network show more texture information and better visual quality than other state-of-the-art fusion methods. From both subjective and objective points, our method is competitive with or even outperform most of advanced fusion methods.
摘要：
Based on the linkage of genotype and phenotype, display technology has been widely used to generate specific ligands for profiling, imaging, diagnosis and therapy applications. However, due to the lack of effective monoclonal manipulation and affinity evaluation methods, traditional display technology has to undergo tedious steps of selection, clone isolation, amplification, sequencing, synthesis and characterization to obtain the binding sequences. To directly acquire high-affinity clones, we propose a double monoclonal display approach (dm-Display) for peptide screening based on highly paralleled monoclonal manipulation in emulsion droplets. dm-Display can monoclonally link the genotype, phenotype and affinity to realize integrated monoclonal separation, amplification, recognition and staining in one droplet so that discrete high-affinity clones can be quickly extracted. Monoclonal manipulations highly-parallelly occur in millions of droplets so that molecular screening of a highly diverse phage library is achieved. We have screened specific peptide ligands against CD71 and GPC1, proving the feasibility and generality of dm-Display. As a highly efficient ligand screening platform, dm-Display will promote the further development of molecular screening.
作者机构：
[Zeng, T.] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Yang, X.; Zeng, T.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Yang, X.; Wan, Y.] Univ South China, CNNC Key Lab High Trusted Comp, Hengyang 421001, Peoples R China.;[Yang, X.; Mao, Y.; Wan, Y.; Liu, Z.] Univ South China, Sch Comp, Hengyang 421001, Peoples R China.
摘要：
The optimization measures in the physical protection system monitoring center of a nuclear power plant include the prioritization of alarm signals, optimization of sound and light alarm form, improvement of the layout of video monitor screen, security training, and strengthening of organizational management. Based on the fuzzy analytic hierarchy process, the influence of these factors on the probability of alert assessment and guard’s respond time in the EASI method are quantitatively analyzed. Making full use of the measures for prioritization of alarm signals can effectively promote the improvement of human-computer interaction efficiency. The degree of influence of the four factors (guarder’s status, decision strategy, guarder’s training and organization management) on guard’s decision-making is roughly the same.
作者机构：
[Chen, Jingliang; Ouyang, Hongzhi; Yao, Xueling] Xi An Jiao Tong Univ, State Key Lab Elect Insulat & Power Equipment, Xian 710049, Peoples R China.;[Ouyang, Hongzhi] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.
关键词：
magnetic field sensor;digital integration;frequency equalization;lightning electromagnetic environment;calibration
摘要：
Transient magnetic field sensors are used in various electromagnetic environment measurement scenarios. In this paper, a novel magnetic field sensor based on a digital integrator was developed. The antenna was a small B-DOT loop. It was designed optimally for the simulation. The magnetic field signal was digitally integrated with the improved Al-Alaoui algorithm, resulting in less integration error. To compensate for the bandwidth loss of the optical fiber system, we specially designed an FIR (finite impulse response) filter for frequency compensation. The circuit was described, and the transimpedance amplifier was specially designed to ensure the low noise characteristic of the receiver. The sensitivity of the sensor was calibrated at 68.2 A center dot m(-1)/mV, the dynamic range was 50 dB (1-300 kA/m), the linear correlation coefficient was 0.96, and the bandwidth was greater than 100 MHz. It was tested and verified under the action of an A-type lightning current. The sensor exhibited high-precision performance and flat amplitude-frequency characteristics. Therefore, it is suitable for lightning positioning, partial discharge testing, electromagnetic compatibility management, and other applications.
作者机构：
[Wang, F. D.; Wan, S. K.; Bin, B.; Li, Y. C.; Zhang, H. M.; Lyu, B.; He, L.; Fu, J.] Chinese Acad Sci, Inst Plasma Phys, HFIPS, Hefei 230031, Peoples R China.;[Wan, S. K.; Bin, B.; Li, Y. C.; He, L.] Univ Sci & Technol China, Sci Isl Branch, Grad Sch, Hefei 230026, Peoples R China.;[Shen, Y. C.] Hefei Normal Univ, Hefei 230601, Peoples R China.;[Li, C. Y.; Yang, W. C.] Anhui Spectreat Instrument Co Ltd, Hefei 230088, Peoples R China.;[Du, X. W.; Wang, Q. P.] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China.
通讯机构：
[H. M. Zhang; B. Lyu] I;Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences , Hefei 230031, China
摘要：
The impurity radiation from the divertor region of the EAST tokamak is dominantly in the wavelength range of vacuum ultraviolet (VUV) due to the elevated edge electron temperature. A space-resolved VUV spectroscopy is developed to measure impurity radiation in the divertor region. An eagle-type VUV spectrometer with a focal length of 1 m is adopted in this system, equipped with a spherical grating and a charged-coupled device (CCD) detector. The performance of the VUV spectrometer is preliminarily tested on a synchrotron radiation facility. The wavelength calibration is conducted near 65 nm. It is found that the wavelength range observed by the CCD detector is about 11.07 nm around the central wavelength of about 65 nm. With a linear dispersion of 0.0053 nm/pixel, it is possible to measure the ion temperature lower than 20 eV at the edge region by analyzing the Doppler broadening of a carbon line. These test results show that the performance of the VUV spectrometer is capable of measuring divertor radiation and analyzing the ion temperature of edge impurity ions.
摘要：
Engineering strong single-photon optomechanical couplings is crucial for optomechanical systems. Here, we propose a hybrid quantum system consisting of a nanobeam (phonons) coupled to a spin ensemble and a cavity (photons) to overcome it. Utilizing the critical property of the lower-branch polariton (LBP) formed by the ensemble-phonon interaction, the LBP-cavity coupling can be greatly enhanced by three orders magnitude of the original one, while the upper-branch polariton (UBP)-cavity coupling is fully suppressed. Our proposal breaks through the condition of the coupling strength less than the critical value in previous schemes using two harmonic oscillators. Also, strong Kerr effect can be induced in our proposal. This shows our proposed approach can be used to study quantum nonlinear and nonclassical effects in weakly coupled optomechanical systems. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
关键词：
Choppers (circuits);Switches;Voltage control;Traction motors;Inverters;Chopper;four-quadrant converter;hardware in the loop;multisystem locomotives;ripple suppression;rapid control prototype
摘要：
The multisystem locomotive traction drive system is fed by different kinds of railway traction power supply systems (TPSSs). The direct connection of the dc TPSSs and the traction inverter are broadly adopted. However, the dc-link voltage is influenced by the variable and fluctuant catenary voltage, therefore wasting the capacity of the devices, complicating the wiring of motor as well as reducing the reliability of system. In this article, the line-side converter, which is used as an ac/dc four-quadrant converter in ac supply system, is reconfigured as a dc/dc chopper for dc voltage matching in dc supply systems. The quadruple interleaved structure is adopted to eliminate the current ripple caused by the chopper. First, structures and corresponding switching method of the reconfigurable line-side converter are introduced. With the help of modal analysis, the principle of chopper operation, the mechanism, and the influencing factors of current ripple suppression are revealed. The system control method and configuration switching algorithm for voltage matching and stabilizing are then presented. Finally, the proposed conceives are validated by hardware-in-the-loop-based system.
期刊：
Applied Radiation and Isotopes,2021年174:109712 ISSN：0969-8043
通讯作者：
Lei, Lin(xlinw@126.com)
作者机构：
[Lei, JieHeng] Univ South China, Sch Elect Engn, Hengyang 421001, Hunan, Peoples R China.;[Lei, Lin] Univ South China, Sch Resources & Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Yin, Zeyuan; Lei, ZeYong; Qin, QianQian] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Lin Lei] S;School of Resources & Environment and Safety Engineering, University of South China, Hengyang, 421001, Hunan province, China
关键词：
Gamma radiation measurement;Uranium fluoride;Materials level;Algorithms of gamma radiation field
摘要：
The measurement of material level change in uranium fluorination has an essential influence on uranium production quality. In this study, a method to determine the level change of uranium fluorination mixture in the hopper by online radiation meter outside hopper is established. We have designed an experiment to study the change of radiation field outside the hopper with a known height of radioactive material to discover its regular pattern. The experimental results show that when the probe is placed 50 mm away from the cylinder wall, the average radiation dose is more significant, and the change of radiation dose measured by the instrument at this position is more evident than that at other positions. Then through the measurement of the external radiation field of the hopper with unknown material level to estimate the material level, and by opening the cover of hopper to verify the accuracy of the material level measurement method. Based on the experimental results and theoretical analysis, a method and formula for judging the mixture material are proposed. This method can quickly determine the level of uranium fluoride mixture in the hopper online, realize the accurate control of material parameters in the process of uranium conversion, and improve the quality of uranium conversion products.
摘要：
We report on an electro-optically Q-switched Tb:LiYF4 green laser pumped by a frequency-doubled optically pumped semiconductor blue laser. The electro-optically Q-switched characteristics were studied under a wide range of repetition rates from 200 Hz to 50 kHz using a KD2PO4 Q-switch. Up to 198 mu J of pulse energy was obtained with a pulse width of 248 ns at a repetition rate of 200 Hz, corresponding to a peak power of 797 W at 544 nm. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
期刊：
Science and Technology of Nuclear Installations,2021年2021 ISSN：1687-6075
作者机构：
[Yang, Xiaohua; Zeng, Tiejun; Jiang, Panpan] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Zeng, Tiejun; Jiang, Panpan] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Yang, Xiaohua; Wan, Yaping] CNNC Key Lab High Trusted Comp, Hengyang 421001, Peoples R China.;[Yang, Xiaohua; Wan, Yaping; Liu Zhenghai] Univ South China, Sch Comp, Hengyang 421001, Peoples R China.
摘要：
The loss and theft of radioactive material in transport can be attributed to the illegal movement. In order to distinguish it from the movement caused by the turbulence of the transportation vehicle, this paper proposes the criterion of "illegal movement" as the movement of radioactive materials outside the transportation compartment. Since the interior of the compartment is generally a metal environment, this paper proposes wireless signal strength data as a sensing method. The wireless signal strength data is filtered and converted into distance data. We construct a spatial triangle perpendicular to the top and sides of the compartment based on the distance data. When the radioactive material is inside the compartment, the angle between its corresponding point and the top plane of the compartment is less than 90 degrees. Once it moves out of the compartment, the angle will be greater than 90 degrees. Based on this, a sensing method of "illegal movement" based on spatial triangles is proposed. The simulation research shows that the scheme proposed in this paper is feasible.
作者机构：
[Deng, Zhixiang; Fan, Dianyuan; Chen, Yu; Liu, Jun] Shenzhen Univ, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst,Coll Optoelect E, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Shenzhen 518060, Peoples R China.;[Deng, Zhixiang] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Zhao, Chujun] Hunan Univ, Sch Phys & Elect, IFSA Collaborat Innovat Ctr, Minist Educ,Lab Micronanooptoelect Devices, Changsha 410082, Peoples R China.
通讯机构：
[Liu, Jun] S;Shenzhen Univ, Minist Educ & Guangdong Prov, Key Lab Optoelect Devices & Syst,Coll Optoelect E, Int Collaborat Lab 2D Mat Optoelect Sci & Technol, Shenzhen 518060, Peoples R China.
摘要：
The spectral analysis of the light propagating in normally dispersive graded-index multimode fibers is performed under initial noisy conditions. Based on the obtained spectra with multiple simulations in the presence of noise, we investigate the correlation in energy between the well-separated spectral sidebands through both the scattergrams and the frequency-dependent energy correlation map and find that conjugate couples are highly correlated while cross-combinations exhibit a very poor degree of correlation. These results reveal that the geometric parametric instability processes associated with each sideband pair occur independently from each other, which can provide significant insights into the fundamental dynamical effect of the geometric parametric instability and facilitate the future implementation of high-efficiency photon pair sources with reduced Raman decorrelations.
作者机构：
[Wang, Hengtai; Zou, Zhiwei] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Shen, Xin] Univ South China, Coll Elect Engn, Hengyang 421001, Peoples R China.
关键词：
lie symmetry analysis;nonlinear self-adjointness;conservation law
摘要：
In the present paper, we mainly focus on the symmetry of the solutions of a given PDE via Lie group method. Meanwhile we transfer the given PDE to ODEs by making use of similarity reductions. Furthermore, it is shown that the given PDE is self-adjoining, and we also study the conservation law via multiplier approach.
摘要：
Image fusion obtains a desired image by integrating the useful information of multiple input images. Most traditional fusion strategy is usually guided by image local contrast or variance, which cannot well represent visual discernable features of source images. And the undesirable seam effects or artifacts produced due to the inconsistency between fusion weight map and image content may severely degrade the visual quality of the fused images. An efficient image fusion method with structural saliency measure and content adaptive consistency verification was proposed. The fusion is implemented under the nonsubsampled contourlet transform (NSCT)-based image fusion framework. The low-frequency NSCT decomposition coefficients are fused with the weight map constructed by considering both structural saliency and visual uniqueness features and refined by spatial consistency with guide filter. The high-frequency NSCT decomposition coefficients are fused with structural saliency. The performances of the proposed method have been verified on several pairs of multifocus images, infrared-visible images, and multimodal medical images. Experimental results clearly demonstrate the superiority of the proposed algorithm compared with several existing state-of-the-art algorithms in terms of both visual and quantitative comparison. (C) 2020 SPIE and IS&T
