摘要：
A compact 4-port coplanar waveguide (CPW) fed ultra-wideband (UWB) multiple-input-multiple-output (MIMO) antenna with enhanced isolation is proposed to operate from 3.66 GHz to 16.61 GHz with 127.78% impedance bandwidth. The proposed antenna system consists of 4 orthogonal arrays of monopole antennas improved by four iterations. The UWB characteristic of the antenna is obtained from an improved monopole antenna fed by CPW. The final MIMO antenna is machined on a Rogers 4003C substrate with dimensions of 60 x 60 x 0.3 mm(3). The orthogonal arrangement of antennas brings about the polarization diversity and certain isolation of MIMO antennas. Four rows of orthogonal metasurface elements with via holes and the ring of the backplane further improve the isolation between antenna elements in the MIMO system. The MIMO antenna has an impedance bandwidth of 12.95 GHz with S-11 < -10 dB and good isolation (S-21 =S-41 < -30 dB and S-31 < -20 dB). In particular, S31 is always less than -25 dB at frequencies greater than 6 GHz. The measured results of MIMO antenna agree with the simulated results. The optimized MIMO antenna has excellent performance in many aspects, such as UWB, compact size, omnidirectional radiation, enhanced isolation and high efficiency, which means that it has application potential in UWB wireless communication systems.
作者机构：
[Xu, Hongbo; Zhu, Li; Li, Ruijie; Chen, Yun; Zhang, Guoping] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Zhu, Li] Hubei Minzu Univ, Coll Intelligent Syst Sci & Engn, Enshi 445000, Peoples R China.
通讯机构：
[Zhang, GP ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
摘要：
Intelligent reflective surface (IRS) and unmanned aerial vehicle (UAV) communication are two key technologies in the sixth generation of mobile communication (6G). In this paper, IRS is equipped on UAV to form aerial IRS, which can achieve 360° panoramic full-angle reflection and flexible deployment of IRS. In order to achieve high-quality and ubiquitous network coverage under data privacy and low latency requirements, we propose an Federated learning (FL) network via Over-the-Air computation (AirComp) in IRS-assisted UAV communications. Our goal is to minimize the worst-case mean square error (MSE) by jointly optimizing the IRS phase shift, denoising factor for noise suppression, the user's transmission power, and UAV trajectory. Optimizing and quickly adjusting the UAV position and IRS phase shift, it flexibly assists the signal transmission between users and base stations (BS). In order to solve this complex non-convex problem, we propose a low-complexity iterative algorithm, which divides the original problem into four sub-problems, respectively using the semi-definite programming (SDP) method, slack variable introduction method, successive convex approximation (SCA) method to solve each sub-problem. Through the analysis of simulation results, our proposed design scheme is obviously better than other benchmark schemes.
期刊：
Chemical Engineering Journal,2023年459:141649 ISSN：1385-8947
作者机构：
[Zhang, Xinyi; Yan, Zehua; Rui, Zhen; Wang, Jiayao; Deng, Wenwen] Suzhou Univ Sci & Technol, Sch Mat Sci & Engn, Suzhou 215000, Peoples R China.;[Yang, Ze] Cent China Normal Univ, Sch Phys Sci & Technol, Inst Nanosci & Nanotechnol, Wuhan 430079, Peoples R China.;[Huang, Yongxin] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China.
关键词：
Aqueous zinc-ion battery;Tetrathiafulvalene;High rate and long life-span;Low temperatures
摘要：
Tetrathiafulvalene (TTF) is introduced as a novel and sustainable cathode material for aqueous zinc ion batteries (AZIBs). Based on an anion insertion/desertion reaction, TTF delivers a capacity of 102 mAh g-1 at 1 A g-1 under-20 degrees C, and obtains a high capacity retention of 96 % after 3500 cycles. Kinetic analysis demonstrates that TTF is more surface-controlled electrochemical process than diffusion-controlled at low temperature. Comprehensive analysis, including ex-situ X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), Raman, Electron Spin-Resonance spectroscopy (ESR) characterization combine with density functional theory (DFT) estimation confirm the high reversibility of the transformation from TTF to TTF+ and TTF2+, when further increase the charging cut-off voltage to 1.6 V, TTF2+ is further oxidized to TTF3+. This work not only offers fundamental understanding for reaction mechanism of tetrathiafulvalene and their homologues in battery uses, but also provides a new electrode choice for AZIBs at low temperatures.
作者机构：
[Yu, Yun-Wei; Liu, Liang-Duan; Liu, Jian-Feng] Cent China Normal Univ, Inst Astrophys, Wuhan 430079, Peoples R China.;[Yu, Yun-Wei; Liu, Liang-Duan; Liu, Jian-Feng] Cent China Normal Univ, Key Lab Quark & Lepton Phys, Minist Educ, Wuhan 430079, Peoples R China.;[Zhu, Jin-Ping] Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia.
摘要：
Despite the fact that the progenitor of fast blue optical transients (FBOTs) is still a subject of debate, FBOTs are sometimes suggested to originate from the core collapse of ultra-stripped stars and be powered by a spinning-down neutron star. Following this consideration, it is expected that the late-time evolution of the progenitor stars can leave important imprints in the circumstellar material (CSM) of FBOTs, due to the strong mass loss of the stars. The interaction of the FBOT ejecta with the CSM can drive a long-lasting shock to generate radio emission, which thus enables us to probe the CSM properties through radio observation although such observations are still rare. Within the framework of the magnetar-powered model, Liu et al. fitted the multi-band optical light curves of 40 FBOTs, and hence, the statistical distributions of the FBOT magnetar and ejecta parameters were obtained. Based on these FBOT population results, we investigate the dependence of the radio emission on the mass-loss rate of the progenitors and evaluate the detectability of radio emission from FBOTs with current and future telescopes. It is found that the distribution of the peak time and peak luminosity of the emission at 8.4 GHz are primarily in the regions of t (peak,nu ) = 10(2.12 +/- 0.63) days and L (peak,nu ) = 10(28.73 +/- 0.83) erg s(-1) Hz(-1), respectively. A joint detection of the Zwicky Transient Facility and Very Large Array could achieve success in about 8.7% FBOTs of z <= 1. Furthermore, if considering a joint detection of the Chinese Space Station Telescope and the Square Kilometer Array, this rate of success could be increased to about 23.9%.
作者机构：
[Hou, Junjie; Lin, Hai; Hou, JJ; Fu, Jiaping; Jin, Jing; Liu, Zixin] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.;[Feng, Feng] Tianjin Univ, Sch Microelect, Tianjin, Peoples R China.
会议名称：
IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)
会议时间：
JUN 28-30, 2023
会议地点：
Winnipeg, CANADA
会议主办单位：
[Hou, Junjie;Jin, Jing;Lin, Hai;Liu, Zixin;Fu, Jiaping] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.^[Feng, Feng] Tianjin Univ, Sch Microelect, Tianjin, Peoples R China.
会议论文集名称：
International Conference on Numerical Electromagnetic Modeling and Optimization for RF Microwave and Terahertz Applications
关键词：
Inverse design;deep learning;metasurface
摘要：
Inverse design has been an important method to the design of metasurface. Deep learning techniques have been applied to the inverse design of metasurface in recent work. This paper provides an overview of advances in deep learning techniques for inverse design of metasurface, including a target-driven deep learning inverse design technique, the fuzzy inverse design technique, the freeform inverse design technique and the machine-learning-assisted inverse design technique.
通讯机构：
[Qin Xue] D;[Guohua Xie] S;Department of Physical Science and Technology, Central China Normal University, Wuhan 430079, People’s Republic of China<&wdkj&>Sauvage Center for Molecular Sciences, Hubei Key Lab on Organic and Polymeric Optoelectronic Materials, Department of Chemistry, Wuhan University, Wuhan 430072, People’s Republic of China<&wdkj&>Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University, Guangdong 515063, People’s Republic of China<&wdkj&>Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China
摘要：
Cognitive radio (CR) acts as a significant player in enhancing the spectral efficiency (SE) of wireless telecommunications; simultaneously, the intelligent reflecting surface (IRS) technique is a valid technique for increasing the confidentiality properties of wireless telecommunications systems through the modulation of the amplitude and phase shift of the channel. Therefore, we take into consideration an IRS-assisted multiple-input single-output (MISO) CR system to raise the confidentiality rate, which is composed of a primary network with a primary receiver (PR) and an eavesdropping link, as well as a secondary network with a secondary receiver (SR) and SR transmitter (SR-TX). In particular, we minimize the SR’s transmit power under the interference temperature (IT) and confidentiality capacity constraints via the joint optimization of the beamforming vector and artificial noise (AN) constraint matrix at SR-TX together with the phase shift matrix of IRS. Numerical outcomes indicate that various transmit antenna values and the IRS element numbers at SR-TX can greatly reduce transmit power while assuring secure communication.
作者：
R. Aaij;A. S. W. Abdelmotteleb;C. Abellan Beteta;F. Abudinén;T. Ackernley;...
期刊：
Journal of High Energy Physics,2023年2023(7):1-35 ISSN：1029-8479
通讯作者：
J. Baptista de Souza Leite
作者机构：
[R. Aaij; K. Akiba; A. Biolchini; J. S. Butter; S. Ferreres Sole; E. Gabriel; M. D. Galati; R. E. Geertsema; L. M. Greeven; K. Heijhoff; W. Hulsbergen; E. Jans; T. Ketel; P. Koppenburg; A. Mauri; A. Pellegrino; C. Sanchez Gras; M. Schubiger; A. Snoch; N. Tuning; A. Usachov; M. van Beuzekom; M. Veronesi] Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands;[A. S. W. Abdelmotteleb; F. Abudinén; J. J. Back; A. Beck; T. Blake; M. F. Cicala; L. M. Garcia Martin; T. Gershon; R. J. Hunter; T. P. Jones; M. Kenzie; M. Kreps; T. Latham; E. Millard; A. G. Morris; E. Muhammad; B. Pagare; L. Paolucci; M. Ramos Pernas; M. Vesterinen; A. R. Wiederhold; M. Xu] Department of Physics, University of Warwick, Coventry, United Kingdom;[C. Abellan Beteta; M. Andersson; M. Atzeni; V. Bellee; R. Bernet; C. Betancourt; Ia. Bezshyiko; A. Buonaura; D. C. Craik; D. De Simone; V. Denysenko; J. Eschle; S. Esen; M. Ferrillo; D. Lancierini; C. A. Manzari; A. Mathad; K. Müller; P. Owen; N. Serra; E. Smith; O. Steinkamp; Z. Wang] Physik-Institut, Universität Zürich, Zürich, Switzerland;[T. Ackernley; T. J. V. Bowcock; J. Brown; G. Casse; A. J. Chadwick; C. A. Chavez Barajas; S. Farry; V. Franco Lima; T. Halewood-leagas; J. Hammerich; T. Harrison; K. Hennessy; D. Hutchcroft; P. J. Marshall; J. V. Mead; K. Rinnert; E. Rodrigues; S. Scherl; T. Shears; K. A. Thomson; E. Vilella Figueras; L. E. Yeomans] Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom;[B. Adeva; P. Baladron Rodriguez; S. Belin; A. Brea Rodriguez; A. Brossa Gonzalo; A. Casais Vidal; V. Chobanova; X. Cid Vidal; I. Corredoira; J. Dalseno; L. Dieste Maronas; C. Eirea Orro; M. Fernandez Gomez; A. Gallas Torreira; B. Garcia Plana; A. Gioventù; C. Landesa Gomez; J. Lomba Castro; S. López Soliño; D. Martinez Santos; T. Mombächer; J. Novoa Fernandez; A. Pereiro Castro; M. Plo Casasus; C. Prouve; E. Rodriguez Fernandez; E. Rodriguez Rodriguez; M. Romero Lamas; A. Romero Vidal; R. A. Ruiz Fernandez; J. J. Saborido Silva; C. Santamarina Rios; S. Sellam; P. Vazquez Regueiro] Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
通讯机构：
[J. Baptista de Souza Leite] C;Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
关键词：
Charm Physics;Hadron-Hadron Scattering;Particle and Resonance Production
摘要：
A Dalitz plot analysis of the
$$ {D}_s^{+} $$
→ π−π+π+ decay is presented. The analysis is based on proton-proton collision data recorded by the LHCb experiment at a centre-of-mass energy of 8 TeV and corresponding to an integrated luminosity of 1.5 fb−1. The resonant structure of the decay is obtained using a quasi-model-independent partial-wave analysis, in which the π+π− S-wave amplitude is parameterised as a generic complex function determined by a fit to the data. The S-wave component is found to be dominant, followed by the contribution from spin-2 resonances and a small contribution from spin-1 resonances. The latter includes the first observation of the
$$ {D}_s^{+} $$
→ ω(782)π+ channel in the
$$ {D}_s^{+} $$
→ π−π+π+ decay. The resonant structures of the
$$ {D}_s^{+} $$
→ π−π+π+ and D+ → π−π+π+ decays are compared, providing information about the mechanisms for the hadron formation in these decays.
摘要：
Hipposideros pratti called at higher intensities while keeping the constant frequencies of their echolocation pulses consistent under spectrally non-overlapping background noise conditions. The noise could decrease auditory sensitivity and sharp intensity tuning, suggesting an acoustic masking effect. These results provide further evidence of negative consequences of anthropogenic noise. The environment noise may disturb animal behavior and echolocation via three potential mechanisms: acoustic masking, reduced attention and noise avoidance. Compared with the mechanisms of reduced attention and noise avoidance, acoustic masking is thought to occur only when the signal and background noise overlap spectrally and temporally. In this study, we investigated the effects of spectrally non-overlapping noise on echolocation pulses and electrophysiological responses of a constant frequency-frequency modulation (CF-FM) bat, Hipposideros pratti. We found that H. pratti called at higher intensities while keeping the CFs of their echolocation pulses consistent. Electrophysiological tests indicated that the noise could decrease auditory sensitivity and sharp intensity tuning, suggesting that spectrally non-overlapping noise imparts an acoustic masking effect. Because anthropogenic noises are usually concentrated at low frequencies and are spectrally non-overlapping with the bat's echolocation pulses, our results provide further evidence of negative consequences of anthropogenic noise. On this basis, we sound a warning against noise in the foraging habitats of echolocating bats.
期刊：
Journal of Chemical Information and Modeling,2023年63(16):5097-5106 ISSN：1549-9596
作者机构：
[Zhang, Yu] College of Physical Science and Technology, Huazhong Normal University, Wuhan 430079, China;[Yang, Minghui; Yu, Jinhui; Zhang, Yu; Song, Hongwei] Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China;[Yu, Jinhui] Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China;[Yang, Minghui] Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
摘要：
Accurate determination of the thermal rate constants for combustion reactions is a highly challenging task, both experimentally and theoretically. Machine learning has been proven to be a powerful tool to predict reaction rate constants in recent years. In this work, three supervised machine learning algorithms, including XGB, FNN, and XGB-FNN, are used to develop quantitative structure-property relationship models for the estimation of the rate constants of hydrogen abstraction reactions from alkanes by the free radicals CH(3), H, and O. The molecular similarity based on Morgan molecular fingerprints combined with the topological indices are proposed to represent chemical reactions in the machine learning models. Using the newly constructed descriptors, the hybrid XGB-FNN algorithm yields average deviations of 65.4%, 12.1%, and 64.5% on the prediction sets of alkanes + CH(3), H, and O, respectively, whose performance is comparable and even superior to the corresponding one using the activation energy as a descriptor. The use of activation energy as a descriptor has previously been shown to significantly improve prediction accuracy ( Fuel 2022, 322, 124150) but typically requires cumbersome ab initio calculations. In addition, the XGB-FNN models could reasonably predict reaction rate constants of hydrogen abstractions from different sites of alkanes and their isomers, indicating a good generalization ability. It is expected that the reaction descriptors proposed in this work can be applied to build machine learning models for other reactions.
作者机构：
[Lin, Huiru; Zhang, Chuan; Zhang, Danxuan; Lan, Wencen; Wang, Bin] Cent China Normal Univ, Sch Phys Educ, Wuhan, Peoples R China.
通讯机构：
[Bin Wang] S;School of Physical Education, Central China Normal University, Wuhan, China
关键词：
Dual-task postural control;Spatial working memory;Capacity load;Resolution load;Dual-task effect
摘要：
Increased spatial processing demands, e.g., working memory loads, which include capacity load and resolution load, may interfere with postural stability. To date, there has been little evidence to demonstrate whether capacity load and resolution load affect postural stability. Therefore, this study manipulated capacity load and resolution load in a spatial working memory task to examine how postural stability is affected. Sixteen healthy young participants were tested in a dual-task paradigm that consisted of a postural task with a tandem Romberg stance and a spatial working memory task with different capacity loads and resolution loads in different sessions. Participants were required to detect a salient change (45° in low resolution) or a subtle change (15° in high resolution) in the bar orientation as a resolution load. Capacity load was manipulated by storing the number of bars, with two bars in low capacity and four in high capacity. The results showed significant interactions between capacity load and resolution load on dual-task effects of sway velocity. In the low-resolution condition, the dual-task effects of anteroposterior and mediolateral sway velocity were significantly lower in the high capacity than in the low capacity, yet no significant differences occurred in the high-resolution load condition. Our results suggest that increased capacity loads interfere with postural stability only in low-resolution loads while dual-tasking.
摘要：
Front-end electronics (FEEs) equipped with high-speed digitizers are being used and proposed for future nuclear detectors. Recent literature reveals that deep learning models, especially 1-D convolutional neural networks (NNs), are promising when dealing with digital signals from nuclear detectors. Simulations and experiments demonstrate the satisfactory accuracy and additional benefits of NNs in this area. However, specific hardware accelerating such models for online operations still needs to be studied. In this work, we introduce PulseDL-II , a system-on-chip (SoC) specially designed for applications of event feature (time, energy, and so on) extraction from pulses with deep learning. Based on the previous version, PulseDL-II incorporates an reduced instruction set computer (RISC) CPU into the system structure for better functional flexibility and integrity. The NN accelerator in the SoC adopts a three-level (arithmetic unit (AU), processing element (PE), and NN) hierarchical architecture and facilitates parameter optimization of the digital design. Furthermore, we devise a quantization scheme compatible with deep learning frameworks (e.g., TensorFlow) within a selected subset of layer types. We validate the correct operations of PulseDL-II on field programmable gate arrays (FPGAs) alone and with an experimental setup comprising a direct digital synthesis (DDS) and analog-to-digital converters (ADCs). The proposed system achieved 60-ps time resolution and 0.40% energy resolution at a signal-to-noise ratio (SNR) of 47.4 dB.
摘要：
The cooler storage ring (CSR) external-target experiment (CEE) at the Heavy Ion Research Facility at Lanzhou (HIRFL) will be the first giga-electron volt large-scale nuclear physics experiment developed independently in China. The primary physics goal of the CEE is to study the nuclear equation of state, hypernuclei, and radioactive ion beam physics. The zero degree calorimeter (ZDC) of CEE measures the centrality and reaction plane of the nuclear–nuclear collision relative to the hadron background. It consists of 192 roughly trapezoidal plastic scintillator (PS) crystal blocks coupled with photomultiplier tube (PMT) to convert charged particles into electrical signals. The readout electronics consist of 12 front-end electronics (FEEs), the subtrigger module, and the subclock module. In addition, one high voltage (HV) crate provides an HV power supply for the PMTs. According to the electrical test on the electronics, the root mean square (RMS) noise is less than 0.4 mV, and the nonlinearity is less than 0.06%. The heavy-ion beam test shows that the ZDC can measure particles up to $Z =7$ , which meets the physics requirements.
期刊：
Physica A: Statistical Mechanics and its Applications,2023年617:128666 ISSN：0378-4371
通讯作者：
Liu, FY
作者机构：
[Yang, Chunbin; Liu, Feiyi; Chen, Shiyang; Deng, Weibing; Li, Wei; Chen, Xiangna; Liu, FY] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Yang, Chunbin; Liu, Feiyi; Chen, Shiyang; Deng, Weibing; Li, Wei; Chen, Xiangna; Liu, FY] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Liu, Feiyi; Papp, Gabor; Liu, FY] Eotvos Lorand Univ, Inst Phys, 1-A Pazmany P Setany, H-1117 Budapest, Hungary.;[Li, Wei] Max Planck Inst Math Sci, D-04103 Leipzig, Germany.;[Shen, Jianmin] Baoshan Univ, Sch Engn & Technol, Baoshan 678000, Peoples R China.
通讯机构：
[Liu, FY ] C;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Eotvos Lorand Univ, Inst Phys, 1-A Pazmany P Setany, H-1117 Budapest, Hungary.
摘要：
A transfer learning method, Domain Adversarial Neural Network (DANN), is introduced to study the phase transition of two-dimensional q-state Potts model. With the DANN, we only need to choose a few labeled configurations automatically as input data, then the critical points can be obtained after training the algorithm. By an additional iterative process, the critical points can be captured to comparable accuracy to Monte Carlo simulations as we demonstrate it for q = 3,4, 5, 7 and 10. The type of phase transition (first or second-order) is also determined at the same time. Meanwhile, for the second -order phase transition at q = 3, we can calculate the critical exponent & nu; by data collapse. Furthermore, compared to the traditional supervised learning, we found the DANN to be more accurate with lower cost.& COPY; 2023 Elsevier B.V. All rights reserved.
作者机构：
[Xia, Qiaoqiao; Wang, Ji; Wang, J; Ma, Xinxin] Cent China Normal Univ, Dept Elect & Informat Engn, Wuhan, Peoples R China.;[Zheng, Le] Beijing Inst Technol, Sch Informat & Elect, Beijing, Peoples R China.;[Yang, Kai] Tongji Univ, Dept Comp Sci, Shanghai, Peoples R China.;[Chen, Zhao] Tsinghua Univ, Beijing Natl Res Ctr Informat Sci & Technol, Beijing, Peoples R China.
会议名称：
IEEE Wireless Communications and Networking Conference (WCNC)
会议时间：
MAR 26-29, 2023
会议地点：
Glasgow, SCOTLAND
会议主办单位：
[Wang, Ji;Ma, Xinxin;Xia, Qiaoqiao] Cent China Normal Univ, Dept Elect & Informat Engn, Wuhan, Peoples R China.^[Zheng, Le] Beijing Inst Technol, Sch Informat & Elect, Beijing, Peoples R China.^[Yang, Kai] Tongji Univ, Dept Comp Sci, Shanghai, Peoples R China.^[Chen, Zhao] Tsinghua Univ, Beijing Natl Res Ctr Informat Sci & Technol, Beijing, Peoples R China.
会议论文集名称：
IEEE Wireless Communications and Networking Conference
关键词：
Internet of Things;ultra-dense cloud radio access network;energy harvesting;successive convex approximation
摘要：
This paper studies the secrecy wireless information and power transfer problem in ultra-dense cloud radio access network (UD-CRAN) with wireless fronthaul, which is a promising framework for future Internet of Things (IoT). The transmission schemes of wireless fronthaul and access links are jointly designed, while addressing the characteristics of ultra-dense network such as base station diversity and high probability of line-of-sight transmission. Specifically, we employ the idea of block diagonalization to deal with the fronthaul interference, which support multi-stream fronthaul transmission for each remote radio head (RRH). We then jointly optimize the power allocation in the fronthaul and the resource allocation in the access link which includes beamforming for information and energy transmission, on/off of RRHs, and user-RRH association. In order to solve the formulated mixed integer non-convex optimization problem, we leverage the sparsity of beamforming vectors brought by the ultra-dense RRHs. We then solve the reformulated problem by employing the successive convex approximation approach. Finally, numerical results are presented to demonstrate the effectiveness of the proposed scheme.
作者：
R. Aaij;A. S. W. Abdelmotteleb;C. Abellan Beteta;F. Abudinén;T. Ackernley;...
期刊：
EUROPEAN PHYSICAL JOURNAL C,2023年83(7):1-11 ISSN：1434-6044
作者机构：
[R. Aaij; K. Akiba; A. Biolchini; J. S. Butter; S. Ferreres Sole; E. Gabriel; R. E. Geertsema; L. M. Greeven; K. Heijhoff; W. Hulsbergen; E. Jans; P. Koppenburg; M. Lucio Martinez; A. Mauri; A. Pellegrino; C. Sanchez Gras; M. Schubiger; A. Snoch; A. Usachov; M. van Beuzekom; M. Veronesi] Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands;[A. S. W. Abdelmotteleb; F. Abudinén; J. J. Back; A. Beck; T. Blake; A. Brossa Gonzalo; M. F. Cicala; L. M. Garcia Martin; T. Gershon; R. J. Hunter; T. P. Jones; M. Kenzie; M. Kreps; T. Latham; E. Millard; A. G. Morris; B. Pagare; M. Ramos Pernas; M. Vesterinen; A. R. Wiederhold; M. Xu] Department of Physics, University of Warwick, Coventry, UK;[C. Abellan Beteta; M. Andersson; M. Atzeni; V. Bellee; R. Bernet; C. Betancourt; Ia. Bezshyiko; A. Buonaura; D. De Simone; V. Denysenko; J. Eschle; S. Esen; M. Ferrillo; D. Lancierini; C. A. Manzari; A. Mathad; K. Müller; P. Owen; N. Serra; R. Silva Coutinho; E. Smith; O. Steinkamp; Z. Wang] Physik-Institut, Universität Zürich, Zurich, Switzerland;[T. Ackernley; G. Casse; A. J. Chadwick; C. A. Chavez Barajas; S. Farry; V. Franco Lima; T. Halewood-leagas; J. Hammerich; T. Harrison; K. Hennessy; D. Hutchcroft; P. J. Marshall; J. V. Mead; K. Rinnert; E. Rodrigues; S. Scherl; T. Shears; K. A. Thomson; E. Vilella Figueras; L. E. Yeomans] Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK;[B. Adeva; P. Baladron Rodriguez; S. Belin; A. Brea Rodriguez; A. Casais Vidal; V. Chobanova; X. Cid Vidal; I. Corredoira; J. Dalseno; L. Dieste Maronas; C. Eirea Orro; A. Gallas Torreira; B. Garcia Plana; A. Gioventù; C. Landesa Gomez; J. Lomba Castro; S. L.ópez Soliño; D. Martinez Santos; T. Mombächer; J. Novoa Fernandez; A. Pereiro Castro; M. Plo Casasus; C. Prouve; E. Rodriguez Rodriguez; M. Romero Lamas; A. Romero Vidal; R. A. Ruiz Fernandez; J. J. Saborido Silva; C. Santamarina Rios; S. Sellam; P. Vazquez Regueiro] Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
摘要：
The measurement of charmonium states produced in proton-neon (
$$p\text {Ne}$$
) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of
$${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$
and
$$\psi {(2S)}$$
mesons is studied with a beam of 2.5
$$\mathrm{\,Te\hspace{-1.00006pt}V}$$
protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy
$$\sqrt{s_{\scriptscriptstyle \text {NN}}} =68.5\mathrm{\,Ge\hspace{-1.00006pt}V} $$
. The data sample corresponds to an integrated luminosity of
$$21.7\pm 1.4 $$
nb
$$^{-1}$$
. The
$${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$
and
$$\psi {(2S)}$$
hadrons are reconstructed in
$$\mu ^+$$
$$\mu ^-$$
final states. The
$${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$
production cross-section per target nucleon in the centre-of-mass rapidity range
$$y^\star \in [-2.29, 0]$$
is found to be
$$506 \pm 8 \pm 46 \text { nb/nucleon}$$
. The ratio of
$${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$
and
$$D^0$$
cross-sections is evaluated to
$$(1.06 \pm 0.02 \pm 0.09)\%$$
. The
$$\psi {(2S)}$$
to
$${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$
relative production rate is found to be
$$(1.67 \pm 0.27\pm 0.10)\%$$
in good agreement with other measurements involving beam and target nuclei of similar sizes.
关键词：
CO2 reduction;Cu-based electrocatalysts;Multi-carbon products;Energy conversion;Renewable energy;Greenhouse gas
摘要：
Electrochemical CO2 reduction (CO2RR) driven by renewable energy is a promising strategy to close the anthropogenic chemical carbon cycle and simultaneously increase carbon feedstock production. Multi-carbon (C2+) products from CO2RR are very attractive as they are important fuels, chemicals, and industrial raw materials. Copper has received wide attention as an excellent metal catalyst for the formation of C2+ products through CO2RR. Although important advances have been made for Cu-based catalysts to produce C2+ products, there are still challenges such as wide product diversity, poor yield, and high overpotentials. The structure and composition of catalysts affect the binding strength of key intermediates such as *CO and *OCCO during the CO2RR process. Therefore, it is necessary to have in-depth knowledge of the relationship between the structural components and performance to figure out reasonable design strategies. Here, we summarize the favored mechanisms for CO2RR and the possible pathways to produce C2+ products on the surfaces of Cu-based materials. Recent approaches to catalyst design, including structure control, oxide-derived Cu, bimetallic strategy, surface modification, and atomic-level dispersion, are evaluated for their CO2RR performance. Finally, challenges and perspectives in this field are highlighted for further improvement of CO2RR.
摘要：
Hydrogen production from photoelectrochemical (PEC) water splitting has been regarded as a promising way to utilize renewable and endless solar energy. However, semiconductor film grown on photoelectrode suffers from numerous challenges, leading to the poor PEC performance. Herein, a straightforward sol-gel method with the ligand-induced growth strategy was employed to obtain dense and homogeneous copper bismuthate photocathodes for PEC hydrogen evolution reaction. By various characterizations, it was found that the nucleation and surface growth of CuBi2O4 layer induced by 2-methoxyethanol ligand (2-CuBi2O4) demonstrated a decent crystallinity and coverage, as well as a large grain size and a low oxygen vacancy concentration, leading to the good ability of light absorption and carrier migration. Consequently, under simulated sunlight irradiation (AM1.5G, 100 mW/cm2), the 2-CuBi2O4 photocathode achieved an enhanced photocurrent density of -1.34 mA & BULL;cm-2 at 0.4 V versus the reversible hydrogen electrode and a promising applied bias photon-to-current efficiency of 0.586%. This surface modification by ligand growth strategy will shed light on the future design of advanced photoelectrodes for PEC water splitting.
期刊：
EPJ Web of Conferences,2023年276:03006-null ISSN：2100-014X
通讯作者：
Zhoul, YJ
作者机构：
[Zhoul, Yingjie] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Zhoul, Yingjie] Cent China Normal Univ, 1Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
通讯机构：
[Zhoul, YJ ] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Cent China Normal Univ, 1Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
会议名称：
20th International Conference on Strangeness in Quark Matter (SQM)
会议时间：
JUN 13-18, 2022
会议地点：
Busan, SOUTH KOREA
会议主办单位：
[Zhoul, Yingjie] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.^[Zhoul, Yingjie] Cent China Normal Univ, 1Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.
会议论文集名称：
EPJ Web of Conferences
摘要：
Strangeness production has been suggested to be a sensitive probe to the early-time dynamics of the nuclear matter created in heavy-ion collisions. Transverse momentum distributions and yields of strange hadrons provide important information on their production mechanisms and can help us probe the properties of the created medium and its evolution. Thanks to the high statistics data taken during the STAR BES-II program in 2018-2021, a series of measurements on the properties of strangeness production at low energies are carried out. In these proceedings, the production of <i>K<i/><sup>−<sup/>, , <i>ϕ<i/>, <i>Λ<i/>, and Ξ<sup>−<sup/> in Au+Au collisions at GeV are presented. The strange hadron transverse momentum spectra, rapidity density distributions, and particle ratios are shown. These results are compared with UrQMD model calculations, and the extracted kinetic freeze-out parameters are discussed and compared with the ones from higher collision energies.
