作者机构：
[Ketel, T.; Mulder, M.; Tuning, N.; Perez, D. H. Campora; Usachov, A.; de Boer, J.; de Vries, J. A.; Lukashenko, V.; Galati, M. D.; Heijhoff, K.; Akiba, K.; Aaij, R.; Aaij, R; Snoch, A.; De Bruyn, K.; Biolchini, A.; Martinez, M. Lucio; Jans, E.; Vos, K.; Greeven, L. M.; Geertsema, R. E.; Pellegrino, A.; Gabriel, E.; Merk, M.; Onderwater, C. J. G.; Bolognani, C. S.; van Veghel, M.; Butter, J. S.; Koppenburg, P.; Pawley, C. J.; Soares, M. Senghi; Klaver, S.; Gras, C. Sanchez; Nicotra, D.; Raven, G.; Sole, S. Ferreres; Kostiuk, I.; Schubiger, M.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.;[Da Graca, U. De Freitas Carneiro; Massafferri, A.; De Miranda, J. M.; Falcao, L. N.; Bediaga, I. B.; Torres, M. Cruz; Machado, D. Torres; Gomes, A.; dos Reis, A. C.; Santoro, L.; Leite, J. Baptista de Souza] CBPF, Rio De Janeiro, Brazil.;[De Paula, B. Souza; Lopes, J. H.; Goicochea, J. M. Otalora; Polycarpo, E.; Gandelman, M.; Rangel, M. S.; Hicheur, A.; Barbosa, I. R.; Gomes, A.; Garcia, L. Meyer; Rodrigues, F. Ferreira; Goebel, C.; De Paula, L.; Nasteva, I.; Amato, S.; De Almeida, F. L. Souza] Univ Fed Rio de Janeiro, Rio de Janeiro, Brazil.;[Cai, H.; Bian, L.; Liu, G.; Xian, S.; Wang, Z.; Qu, S.; Qin, N.; Li, T.; Ren, Z.; Xu, L.; Tou, D. Y.; Huang, X.; Li, H.; Wang, J.; Li, A.; Hu, X.; Hu, J.; Song, Y.; Tan, Y.; Gong, G.; Wang, X.; Bursche, A.; Lian, Z.; Kang, Y.; Fang, B.; Qi, H. R.; Zhu, X.; Sun, L.; Luo, Y.; Yang, D.; Mu, H.; Zeng, M.; Dong, C.; Zhang, L.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.;[Lu, Y.; Li, Y.; Yuan, X.; Sheng, S.; Li, T.; Wang, J.; Feo, M.; Chen, S.; Xu, Z.; Tobin, M.; Miao, D.; Jiang, X.; Batsukh, B.; Zou, Q.; Liu, S.; Xiang, Z.] IHEP, Beijing, Peoples R China.
摘要：
The first observation of the singly Cabibbo-suppressed 0c -> -K thorn and 0c -> -z thorn decays is reported, using proton -proton collision data at a center -of -mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1, collected with the LHCb detector between 2016 and 2018. The branching fraction ratios are measured to be Bo0c ->-K thorn thorn Bo0c ->-z thorn thorn 1/4 1/26.08 ⠂ 0.51ostat thorn ⠂ 0.40osyst thorn ⠃%; Bo0c ->-z thorn thorn Bo0c ->-z thorn thorn 1/4 1/215.81 ⠂ 0.87ostat thorn ⠂ 0.44osyst thorn ⠂ 0.16oext thorn ⠃%. In addition, using the 0c -> -z thorn decay channel, the 0c baryon mass is measured to be Mo0c thorn 1/4 2695.28 ⠂ 0.07ostat thorn ⠂ 0.27osyst thorn ⠂ 0.30oext thorn MeV; improving the precision of the previous world average by a factor of 4.
作者机构：
[Yu, Xue-Feng; He, Xingchen; Yu, XF; Liu, Yanliang; Liu, Wenjun; Li, Dong; Shi, Tongyu; Wang, Jiahong; Huang, Hao] Chinese Acad Sci, Shenzhen Inst Adv Technol, Mat Interfaces Ctr, Shenzhen, Guangdong, Peoples R China.;[Sun, XM; Sun, Xiangming; Gao, Chaosong; Wu, Meng] Cent China Normal Univ, Key Lab Quark & Lepton Phys, Wuhan, Hubei, Peoples R China.;[Zhang, Xin; Zhu, Jiongtao; Ge, Yongshuai; Liang, Dong] Chinese Acad Sci, Shenzhen Inst Adv Technol, Res Ctr Med Artificial Intelligence, Shenzhen, Guangdong, Peoples R China.;[Zheng, Hairong; Sheng, Zonghai; Ge, Yongshuai; Liang, Dong; Zheng, HR] Chinese Acad Sci, Shenzhen Inst Adv Technol, Paul C Lauterbur Res Ctr Biomed Imaging, Shenzhen, Guangdong, Peoples R China.;[Zheng, Hairong; Yu, Xue-Feng; Sheng, Zonghai; Ge, Yongshuai; Yu, XF; Liang, Dong; Zheng, HR] Chinese Acad Sci, Key Lab Biomed Imaging Sci & Syst, Shenzhen, Guangdong, Peoples R China.
通讯机构：
[Sun, XM ; Yu, XF; Ge, YS ; Zheng, HR; Yu, XF ] C;Chinese Acad Sci, Shenzhen Inst Adv Technol, Mat Interfaces Ctr, Shenzhen, Guangdong, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys, Wuhan, Hubei, Peoples R China.;Chinese Acad Sci, Shenzhen Inst Adv Technol, Res Ctr Med Artificial Intelligence, Shenzhen, Guangdong, Peoples R China.;Chinese Acad Sci, Shenzhen Inst Adv Technol, Paul C Lauterbur Res Ctr Biomed Imaging, Shenzhen, Guangdong, Peoples R China.
摘要：
High performance X-ray detector with ultra-high spatial and temporal resolution are crucial for biomedical imaging. This study reports a dynamic direct-conversion CMOS X-ray detector assembled with screen-printed CsPbBr3, whose mobility-lifetime product is 5.2 x 10-4 cm2 V-1 and X-ray sensitivity is 1.6 x 104 mu C Gyair-1 cm-2. Samples larger than 5 cmx\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\times$$\end{document}10 cm can be rapidly imaged by scanning this detector at a speed of 300 frames per second along the vertical and horizontal directions. In comparison to traditional indirect-conversion CMOS X-ray detector, this perovskite CMOS detector offers high spatial resolution (5.0 lp mm-1) X-ray radiographic imaging capability at low radiation dose (260 nGy). Moreover, 3D tomographic images of a biological specimen are also successfully reconstructed. These results highlight the perovskite CMOS detector's potential in high-resolution, large-area, low-dose dynamic biomedical X-ray and CT imaging, as well as in non-destructive X-ray testing and security scanning. Biomedical X-ray imaging requires high spatial and temporal resolution of the detectors. Liu et al. report a screen-printed perovskite direct-conversion X-ray CMOS imager with a spatial resolution of 5 lp mm-1 and a speed of 300 fps for low-dose 2D radiography and 3D computed tomography imaging.
作者机构：
[Xu, Hongbo; Wang, Dong; Huang, Xingxing; Li, Ruijie; Chen, Yun; Zhang, Guoping] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
通讯机构：
[Zhang, GP ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
Integrated sensing and communication (ISAC);Outage probability (OP);Power optimization;Non -orthogonal multiple access (NOMA)
摘要：
This paper investigates a framework for integrated sensing and communication (ISAC) based on non-orthogonal multiple access (NOMA). In this framework, a dual-function base station (BS) utilizes NOMA technology to send superimposed signals to various users, and this superimposed signal also acts on target sensing simultaneously. Considering the channel estimation error, ensuring the communication performance, and sensing performance requirements, a transmit power optimization problem of ISAC system using NOMA is studied. Specifically, in the statistical channel state information (CSI) error model, the total system communicate power is minimized while ensuring all single users' rate outage probability (OP) constraints and the requirements for the beampattern gains of all single radar targets. Unfortunately, the proposed problem is challenging to solve and non-convex. But we have devised a feasible way to deal with this problem. First, we use Bernstein inequality to transform the rate OP constraint, and this challenging non-convex problem is then successfully solved using a method based on semi-definite relaxation (SDR). The numerical outcomes demonstrate that the system's overall transmission power will increase due to the channel estimation error. The numerical findings also show that the ISAC system performs better with NOMA assistance than with OMA when comparing the NOMA and OMA schemes.
期刊：
Journal of Materials Chemistry C,2024年12(3):1002-1011 ISSN：2050-7526
通讯作者：
Tang, YW;Shi, Y
作者机构：
[Chen, Mingyue; Tang, Yiwen; Ran, Hongbing; Wu, Tong; Tang, YW] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;[Chen, Junfeng; Shi, Y; Shi, Yun; Zheng, Jiaqian; Li, Xiang] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201899, Peoples R China.;[Chen, Junfeng; Shi, Y; Shi, Yun] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China.;[Wu, Haodi] Huazhong Univ Sci & Technol, WNLO, Wuhan 430074, Peoples R China.;[Wu, Haodi] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China.
通讯机构：
[Shi, Y ; Tang, YW ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.;Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201899, Peoples R China.;Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China.
摘要：
Ternary copper halides, such as Cs3Cu2I5, as an emerging class of nontoxic alternatives to lead halide perovskites, have drawn extensive attention in the X-ray detection field due to their efficient self-trapped exciton emissions. However, the light yield far below the theoretical limit seriously hinders the high-resolution X-ray detection application of copper halide scintillators. Herein, Cs3Cu2I5:K+ scintillation films and single crystals with enhanced photoluminescence (PL) and radiation luminescence (RL) were first obtained by adjusting the doping concentration of K+ ions in the 0-8 at% range. The substitution of Cs+ by doping K+ compacted the adjacent [Cu2I5](3-) dimer groups, resulting in a stronger exciton-photon coupling strength. Therefore, Cs3Cu2I5:K+ single crystals exhibited a stronger RL emission under X-ray excitation, and their light output was about 49.6% higher than that of the pure Cs3Cu2I5, with an accelerated scintillation decay time (330 to 241 ns). Benefiting from these advantages, X-ray detectors based on hydrophobic polymethyl methacrylate (PMMA)-coated Cs3Cu2I5:K+ flexible films could deliver a higher X-ray imaging resolution of 11.7 lp mm(-1)@MTF = 0.2 in comparison with the commercial gadolinium oxysulfide (GOS)-based detectors (6.2 lp mm(-1)@MTF = 0.2). This work provides insights for the design of metal halides for use in low-cost and high-resolution flexible X-ray imaging systems.
摘要：
Charm quark production and its hadronization in ep and eA collisions at the future Electron-ion Collider in China (EicC) will help us understand the quark/gluon fragmentation processes and the hadronization mechanisms in the nuclear medium, especially within a poorly constrained kinematic region (x < 0.1). In this paper, we report a study on the production of charmed hadrons, D-0 and Lambda(+)(c), reconstructed with a dedicated Geant4 simulation of vertex and tracking detectors designed for EicC. The Lambda(+)(c)/D-0 ratios as functions of multiplicity and p(T), as well as the D-0 double ratio are presented with projected statistical precision.
摘要：
The functional neurons are basic building blocks of the nervous system and are responsible for transmitting information between different parts of the body. However, it is less known about the interaction between the neuron and the field. In this work, we propose a novel functional neuron by introducing a flux-controlled memristor into the FitzHugh-Nagumo neuron model, and the field effect is estimated by the memristor. We investigate the dynamics and energy characteristics of the neuron, and the stochastic resonance is also considered by applying the additive Gaussian noise. The intrinsic energy of the neuron is enlarged after introducing the memristor. Moreover, the energy of the periodic oscillation is larger than that of the adjacent chaotic oscillation with the changing of memristor-related parameters, and same results is obtained by varying stimuli-related parameters. In addition, the energy is proved to be another effective method to estimate stochastic resonance and inverse stochastic resonance. Furthermore, the analog implementation is achieved for the physical realization of the neuron. These results shed lights on the understanding of the firing mechanism for neurons detecting electromagnetic field.
作者机构：
[Xing, Hongxi; Anderle, Daniele Paolo; Anderle, DP; Zhao, Yuxiang] South China Normal Univ, Inst Quantum Matter, Key Lab Atom & Subatom Struct & Quantum Control, MOE, Guangzhou 510006, Peoples R China.;[Xing, Hongxi; Anderle, Daniele Paolo; Anderle, DP] South China Normal Univ, Inst Quantum Matter, Guangdong Prov Key Lab Nucl Sci, Guangzhou 510006, Peoples R China.;[Xing, Hongxi; Anderle, Daniele Paolo; Anderle, DP] South China Normal Univ, Southern Nucl Sci Comp Ctr, Guangdong Hong Kong Joint Lab Quantum Matter, Guangzhou 510006, Guangdong, Peoples R China.;[Guo, Aiqiang; Liang, Yutie; Ma, Yuming; Zhao, Yuxiang] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China.;[Guo, Aiqiang; Liang, Yutie; Zhao, Yuxiang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
通讯机构：
[Anderle, DP ] S;South China Normal Univ, Inst Quantum Matter, Key Lab Atom & Subatom Struct & Quantum Control, MOE, Guangzhou 510006, Peoples R China.;South China Normal Univ, Inst Quantum Matter, Guangdong Prov Key Lab Nucl Sci, Guangzhou 510006, Peoples R China.;South China Normal Univ, Southern Nucl Sci Comp Ctr, Guangdong Hong Kong Joint Lab Quantum Matter, Guangzhou 510006, Guangdong, Peoples R China.
摘要：
The Electron -Ion Collider in China (EicC) has been proposed to study the inner structure of matter and fundamental laws of strong interactions. In this paper, we will present a conceptual design of the tracking system based on the state -of -art silicon detector and micropattern gaseous detector at the EicC and demonstrate that it will enable us to reconstruct charm hadron with good significance, hence study gluonic parton distribution functions in nucleons and nuclei, as well as gluon helicity distributions. The impact study using reweighting techniques shows that the impact of the EicC will be mainly in the large x region. It complements similar physics programs at the Electron -Ion Collider at Brookhaven National Laboratory.
摘要：
The production cross-section of J/ψ pairs in proton-proton collisions at a centre-of-mass energy of
$$ \sqrt{s} $$
= 13 TeV is measured using a data sample corresponding to an integrated luminosity of 4.2 fb−1 collected by the LHCb experiment. The measurement is performed with both J/ψ mesons in the transverse momentum range 0 < pT < 14 GeV/c and rapidity range 2.0 < y < 4.5. The cross-section of this process is measured to be 16.36 ± 0.28 (stat) ± 0.88 (syst) nb. The contributions from single-parton scattering and double-parton scattering are separated based on the dependence of the cross-section on the absolute rapidity difference ∆y between the two J/ψ mesons. The effective cross-section of double-parton scattering is measured to be σeff = 13.1 ± 1.8 (stat) ± 2.3 (syst) mb. The distribution of the azimuthal angle ϕCS of one of the J/ψ mesons in the Collins-Soper frame and the pT-spectrum of the J/ψ pairs are also measured for the study of the gluon transverse-momentum dependent distributions inside protons. The extracted values of ⟨cos 2ϕCS⟩ and ⟨cos 4ϕCS⟩ are consistent with zero, but the presence of azimuthal asymmetry at a few percent level is allowed.
期刊：
BRIEFINGS IN BIOINFORMATICS,2024年25(1) ISSN：1467-5463
通讯作者：
Zhao, YJ
作者机构：
[Liu, Haoquan; Zhao, Yunjie] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan, Peoples R China.;[Zhao, Yunjie] Cent China Normal Univ, Inst Biophys, Dept Phys, Wuhan 430079, Peoples R China.;[Jian, Yiren] Dartmouth Coll, Hanover, NH USA.;[Hou, Jinxuan] Wuhan Univ, Dept Thyroid & Breast Surg, Zhongnan Hosp, Wuhan, Peoples R China.;[Zeng, Chen] Washington Univ, Dept Phys George, St Louis, MO USA.
通讯机构：
[Zhao, YJ ] C;Cent China Normal Univ, Inst Biophys, Dept Phys, Wuhan 430079, Peoples R China.
关键词：
RNA binding site prediction;interface binding dynamical behavior;local and global network properties;distance-based graph algorithm
摘要：
Determining the RNA binding preferences remains challenging because of the bottleneck of the binding interactions accompanied by subtle RNA flexibility. Typically, designing RNA inhibitors involves screening thousands of potential candidates for binding. Accurate binding site information can increase the number of successful hits even with few candidates. There are two main issues regarding RNA binding preference: binding site prediction and binding dynamical behavior prediction. Here, we propose one interpretable network-based approach, RNet, to acquire precise binding site and binding dynamical behavior information. RNetsite employs a machine learning-based network decomposition algorithm to predict RNA binding sites by analyzing the local and global network properties. Our research focuses on large RNAs with 3D structures without considering smaller regulatory RNAs, which are too small and dynamic. Our study shows that RNetsite outperforms existing methods, achieving precision values as high as 0.701 on TE18 and 0.788 on RB9 tests. In addition, RNetsite demonstrates remarkable robustness regarding perturbations in RNA structures. We also developed RNetdyn, a distance-based dynamical graph algorithm, to characterize the interface dynamical behavior consequences upon inhibitor binding. The simulation testing of competitive inhibitors indicates that RNetdyn outperforms the traditional method by 30%. The benchmark testing results demonstrate that RNet is highly accurate and robust. Our interpretable network algorithms can assist in predicting RNA binding preferences and accelerating RNA inhibitor design, providing valuable insights to the RNA research community.
期刊：
Neural Computing and Applications,2024年 ISSN：0941-0643
通讯作者：
Qu, SC
作者机构：
[Qu, Shaocheng; Zheng, Wei; Tang, Qian] Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.;[Zheng, Wei] Kashi Univ, Coll Phys & Elect Engn, Kashi 844000, Xinjiang, Peoples R China.
通讯机构：
[Qu, SC ] C;Cent China Normal Univ, Coll Phys Sci & Technol, Wuhan 430079, Hubei, Peoples R China.
关键词：
Cellular neural network;Memristor;Sliding mode control;Chaotic synchronization;Secure communication
摘要：
The purpose of this research is to investigate the synchronization and control for uncertain memristor-based cellular neural network and its application in secure communication. To address the issue, a novel sliding mode function is designed, on which the system states can effectively converge to the equilibrium point after reaching the sliding mode surface. Moreover, the corresponding controller is constructed by employing the proposed sliding mode function. The proposed control strategy achieves the synchronization of the uncertain memristor-based cellular neural network, and effectively addresses the integral saturation existing in traditional one. In addition, the control performance, including convergence speed, control accuracy, robustness and security, are significantly enhanced. Furthermore, the stability of the system is discussed based on Lyapunov theory. Finally, comparative tests and application examples are presented to verify the effectiveness of the proposed scheme.
摘要：
Semi-supervised classification has gained widespread popularity because of their superior ability to handle unlabeled samples in practical problems. This paper has presented a novel estimation error-ranked LSSVM method with double Mahalanobis-kernel which is used for semi-supervised classification. The main point is to construct two Mahalanobis distances in Hilbert space to form double Mahalanobis-kernel by considering the relationship between the characteristics of two sorts of samples, so as to reduce the influence of non-informational dimensions. Furthermore, the implementation of the proposed method is required to solve the label security problem of unlabeled samples. The unlabeled sample with the minimum evaluated error is selected for labeling, which effectively ensures the accuracy of the unlabeled sample labeling. This method not only considers the similarity of sample features, but also focuses on the security of unlabeled samples. And based on the experimental results of four artificial data sets and several UCI data sets, it verifies the effectiveness of the semi-supervised method with double Mahalanobis-kernel. Especially considering the experimental results of five disease diagnosis data sets, it demonstrates the potential of the proposed semi-supervised classification method in medical diagnosis.
摘要：
Stochastic resonance and energy consumption are significant for information processing and transmission in the neural system. In this paper, we constructed an excitatory–inhibitory cortical neuronal network to investigate the response of the system to weak signals and the corresponding energy consumption. The findings indicate that the excitability of neurons modulates the performance of signal response. Furthermore, the performance of signal response exhibits a bell-shaped dependence on ion channel noise, which is a typical manifestation of the stochastic resonance phenomenon. Stochastic resonance also exists in the network with increasing noise at different excitatory coupling strengths and inhibitory coupling strengths. Furthermore, it is found that the neuronal system obtains optimal transmission of the weak signal at a lower energy consumption. It illustrates that there is a certain economy and efficiency in the signal transmission. At weak inhibitory coupling strength, an optimal excitatory coupling strength exists to allow the neuronal network to make the optimal transmission of the weak signal. However, the phenomenon of double resonant peaks occurs at strong inhibitory coupling strength, which is due to the balance of excitatory and inhibitory synaptic currents. Finally, we demonstrated the robustness of the results to network topology and initial conditions. The results of this paper may contribute to the understanding of signal transmission and its energy consumption in cortical networks.
摘要：
In mm -wave massive multiple -input -multiple -output (MIMO) systems, accurate channel state information (CSI) at the base station (BS) is the key knowledge to obtain the performance gain. Consequently, the user is not only required to complete the channel estimation, but also to feedback CSI to the BS. However, large-scale antenna arrays result in a substantial feedback overhead, which poses a challenging issue. Furthermore, the accuracy requirements of channel estimation and CSI feedback depend on the computing capacity of the user. In this paper, we propose a joint channel estimation and multiple -compression -rate feedback (JCEMF) scheme, and adopt centralized learning (CL) and federated learning (FL) strategies for the scheme. According to the limited computational resources available to users, the JCEMF scheme enables various lengths of feedback bits to change the feedback overhead. Additionally, the users in FL train the local models using their own datasets and upload the local model updates to the BS, thereby reducing communication overhead and protecting data privacy. Specifically, an estimation network is designed for the user to estimate the channel from the received signal. In the CSI feedback process, we introduce an MCRF network, which can achieve CSI compression and reconstruction with different numbers of feedback bits. Simulation results verify that the proposed approach shows good performance of joint channel estimation and multiple -compression -rate CSI feedback in different channel conditions.
摘要：
In this study, the possibility of observing a solar neutrino background in a future neutrinoless double beta decay experiment using a high-pressure gaseous (SeF6)-Se-82 TPC is investigated. Various contributions are simulated, and possible features that could be used for event classification are discussed; two types of backgrounds are identified. The rate of multi-site background events is approximately 0.63 events/(ton<middle dot>yr) in a 30 keV ROI window. This background could be effectively reduced to less than 0.0001 events/(ton<middle dot>yr) (95% C.L.) while maintaining a high signal efficiency of 93% by applying a selection based on the number of clusters and energy of the leading cluster. The rate of the single-electron background events is approximately 0.01 events/(ton<middle dot>yr) in the ROI. Assuming a reduction factor of 10 for the single-electron background events obtained via the algorithms developed for radioactive background rejection, the total background induced by the solar neutrino would be 0.001 events/(ton<middle dot>yr), which is sufficiently small for conducting ton-level experiments.
期刊：
Physica A-Statistical Mechanics and its Applications,2024年637:129533 ISSN：0378-4371
通讯作者：
Liu, FY
作者机构：
[Yang, Chunbin; Liu, Feiyi; Deng, Weibing; Li, Wei; Chen, Xiangna; Liu, FY] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Liu, Feiyi; Deng, Weibing; Li, Wei; Liu, FY] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Liu, Feiyi; Papp, Gabor; Liu, FY] Eotv Lorand Univ, Inst Phys, 1-A Pazmany P Setany, H-1117 Budapest, Hungary.;[Chen, Shiyang] Baoshan Univ, Sch Engn & Technol, Baoshan 678000, Peoples R China.;[Shen, Jianmin] Max Planck Inst Math Sci, D-04103 Leipzig, Germany.
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.;Eotv Lorand Univ, Inst Phys, 1-A Pazmany P Setany, H-1117 Budapest, Hungary.
摘要：
Machine learning techniques exhibit significant performance in discriminating different phases of matter and provide a new avenue for studying phase transitions. We investigate the phase transitions of three dimensional q -state Potts model on cubic lattice by using a transfer learning approach, Domain Adversarial Neural Network (DANN). With the unique neural network architecture, it could evaluate the high -temperature (disordered) and low -temperature (ordered) phases, and identify the first and second order phase transitions. Meanwhile, by training the DANN with a few labeled configurations, the critical points for q = 2, 3, 4 and 5 can be predicted with high accuracy, which are consistent with those of the Monte Carlo simulations. These findings would promote us to learn and explore the properties of phase transitions in high -dimensional systems.
通讯机构：
[Tang, YW ] C;Cent China Normal Univ, Inst Nanosci & Technol, Coll Phys Sci & Technol, Wuhan 430079, Peoples R China.
关键词：
grain boundary passivation;hole-free carbon-based perovskite solar cells;interface modification;MAPbI(3);stability
摘要：
The interface modification of MAPbI3 films by dodecyltrimethylammonium chloride achieves passivation of both the film surface and grain boundaries. Ultimately, the power conversion efficiency and stability (thermal, optical, humidity, and antioxidant) of unencapsulated hole‐free carbon‐based perovskite solar cells are significantly enhanced. Currently, achieving both high efficiency and long‐term stability is crucial for the successful application of perovskite solar cells (PSCs). Grain boundary (GB) defects significantly impact the stability of PSCs, and passivating these GBs remains a major challenge. Herein, the surfactant dodecyltrimethylammonium chloride (DTAC) is dissolved in low‐polarity chlorobenzene (CB) at 58 °C to modify the interface of MAPbI3 film, and DTAC reacts with MAPbI3 film surface to generate a protective layer that can be covered on the perovskite grains, effectively reducing the expose GBs. Additionally, the hydrophobic alkyl chains of DTA+ and the strong chemical bond between the Cl− and Pb2+ ions further enhance the resistance of the perovskite surface layer to heat, moisture, and oxidation. Due to the passivation of iodine vacancy defects, the photo‐stability of unencapsulated DTAC devices is significantly improved. By passivating surface and GBs defects of the MAPbI3 perovskite crystals, the power conversion efficiency of the low‐temperature carbon‐based PSCs treated by DTAC is 15.03% compared to 13.97% for the control device. This study offers another referable strategy for enhancing the thermal, moisture, light, and oxygen stability of perovskite materials while considering the photovoltaic performance of devices.
作者机构：
[Wu, Yanwen; Ge, Di] Cent China Normal Univ, Sch Phys Sci & Technol, 152 Luoyu Rd, Wuhan 430079, Peoples R China.;[Dong, Zheng] Beijing Bytedance Technol Co Ltd, 48 Zhichun Rd, Beijing 200000, Peoples R China.;[Cheng, Yuhang] SHAANXI GSXZ Technol Co Ltd, 57 Fengchan Rd, Xian 710061, Shaanxi, Peoples R China.;[Wu, Yanwen] Cent China Normal Univ, Natl Digital Learning Engn Technol Res Ctr, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
通讯机构：
[Wu, YW ] C;Cent China Normal Univ, Sch Phys Sci & Technol, 152 Luoyu Rd, Wuhan 430079, Peoples R China.
关键词：
Multivariate time series;Spatio-temporal modeling;Graph contrastive learning;Unsupervised anomaly detection
摘要：
Anomaly detection using multivariate time series plays a crucial role in system security. Conventional deep learning detection techniques mainly depend on temporal dependency and employ reconstruction or prediction-based methods. However, as feature variables grow more intricate, there is a risk of neglecting essential spatio-temporal structural information, potentially leading to insufficient model training in unsupervised settings. Hence, we propose an end-to-end anomaly detection model with multiple pre-training tasks designed for the spatio-temporal dimension to enhance our constraints. Specifically, in the temporal dimension, we employ an autoregressive task to train timestamp associations using data’s concealed autocorrelation and periodicity. In the spatio dimension, we acquire knowledge of a diverse feature-related heterogeneous graph. Subsequently, we design three different graph contrastive learning tasks to tap into the effective information arising from the inherent heterogeneity and hierarchy in spatio structures. Through joint spatio-temporal modeling, we can effectively capture inter and intra-feature associations from series and graph structural features, enhancing model robustness to cope with the complex chain reactions between features. Finally, we assess our model on three real-world datasets: SWaT, WADI(2017, 2019), our F1 scores demonstrate enhancements of 6.17%, 18.3% and 5.35% over the top-tier baseline performance. Our model is applicable for both temporal and graph, is self-supervised learning for sparse data which is suitable for data sparsity and complex scenarios that need to capture spatio-temporal characteristics at the same time, for example, traffic flow detection and anomaly detection of intelligent systems. Further visualization experiments and case studies will provide a better interpretation of our model.
作者机构：
[Nayak, Kishora] Sambalpur Univ, Panchayat Coll, Dept Phys, Bargarh 768028, India.;[Shi, Shu-Su] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Shi, Shu-Su] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Lin, Zi-Wei] East Carolina Univ, Dept Phys, Greenville, NC 27858 USA.
通讯机构：
[Nayak, K ] S;Sambalpur Univ, Panchayat Coll, Dept Phys, Bargarh 768028, India.
关键词：
directed flow;coalescence sum rule
摘要：
Recently, the rapidity-odd directed flow (v1) of produced hadrons (K-, phi, p over bar , Lambda over bar , Xi over bar +, omega-, and omega over bar +) has been studied. Several combinations of these produced hadrons, with very small mass differences but differences in the net electric charge (Delta q) and net strangeness (Delta S) on the two sides, have been considered. A difference in v1 between the two sides of these combinations (Delta v1) has been proposed as a consequence of the electromagnetic field produced in relativistic heavy-ion collisions, especially if Delta v1 increases with Delta q. Our study is performed to understand the effect of the coalescence sum rule (CSR) on Delta v1. We point out that the CSR leads to Delta v1=cq Delta q+cS Delta S, where the coefficients cq and cS reflect the Delta v1 of produced quarks. Equivalently, one can write Delta v1=cq Delta q+cB Delta B, involving the difference in the net baryon number Delta B, where the CSR gives cB=-3cS. We then propose two methods to extract the coefficients for the Delta q and Delta S dependences of Delta v1.
作者机构：
[Liu, Feng-Lei; Liu, FL; Qin, Guang-You; Wu, Xiang-Yu; Wang, Xin-Nian] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;[Liu, Feng-Lei; Liu, FL; Qin, Guang-You; Wu, Xiang-Yu; Wang, Xin-Nian] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.;[Cao, Shanshan] Shandong Univ, Inst Frontier & Interdisciplinary Sci, Qingdao 266237, Shandong, Peoples R China.;[Wang, Xin-Nian] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA.
通讯机构：
[Liu, FL ] C;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Hubei, Peoples R China.;Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Hubei, Peoples R China.
摘要：
In a quasi-particle model of QCD matter at finite temperature with thermal masses for quarks and gluons from hard thermal loops, the equation of state (EOS) can be described by an effective temperature dependence of the strong coupling g(T). Assuming the same effective coupling between the exchanged gluon and thermal partons, the EOS can also be related to parton energy loss. Based on the quasi-particle linear Boltzman n transport (QLBT) model coupled to a (3+1)-dimensional viscous hydrodynamic model of the quark-gluon plasma (QGP) evolution and a hybrid fragmentation-coalescence model for heav y quark hadronization, we perform a Bayesian analysis of the experimental data on D meson suppression R-AA and anisotropy v(2) at RHIC and the LHC. We achieve a simultaneous constraint on the QGP EOS and the heav y quark transport coefficient, both consistent with the lattice QCD results.
通讯机构：
[Wang, SY ] S;[Tang, YW ] C;Shenzhen Polytech Univ, Coll Elect & Commun Engn, Shenzhen 518055, Peoples R China.;Cent China Normal Univ, Coll Phys & Technol, Dept Nanosci & Technol, Wuhan 430079, Peoples R China.
关键词：
Perovskite solar cells;Defect passivation;Surface induced secondary grain growth;Graded passivation
摘要：
Trap-mediated non-radiative loss is a major efficiency and stability obstale for solution-processed perovskite solar cells (PSCs). To address this issue, defect passivation using organic molecules has been identified as an effective strategy due to the ionic nature of the perovskite lattice. Herein, Ostwald ripening by using formamidine iodine (FAI) is reported to inhibit the carrier trap induced recombination via promoting secondary grain growth at perovskite surface. Based on secondary grain growth with FAI treatment, the graded passivation was presented caused by FA+ and I- from FAI. Moreover, the findings from time resolved photoluminescence and space charge-limited current technology indicate enhancements in the crystal quality. Consequently, this approach yielded a remarkable power conversion efficiency (PCE) of 20.62% for the FAI modified MAPbI3 photovoltaics, with significantly improved open-circuit voltage ratio of 3.10%, short-circuit density ratio of 6.11%, fill factor ratio of 9.46% and PCE ratio of 19.06%. Moreover, the device show the excellent stability. This study introduces simple and reproducible procedures for fabricating PSCs, which can be readily extended to diverse optoelectronic device applications.
