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Quantum dots enhanced stability of in-situ fabricated perovskite nanocrystals based light-emitting diodes:Electrical field distribution effects

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Fundamental Research 2025年第1期5卷 347-353页

作者： Xulan Xue Menglin Li Zhenjie Liu Chenhui Wang Jincheng Xu Shuangpeng Wang Hanzhuang Zhang Haizheng Zhong Wenyu Ji Key Lab of physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin UniversityChangchun 130012China MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China Institute of Applied physics and Materials engineering University of MacaoTaipa 999078China

With the development in fabricating efficient perovskite light emitting diodes(PeLEDs),improving the operating stability becomes an urgent *** we report quantum dot(QD)enhanced stability of PeLEDs by introducing CdSe/ZnS core-shell QDs in toluene anti-solvent during in-situ fabrication of FAPbBr3 perovskite nanocrystals(PNCs)*** comparison with PNC films with pristine toluene as the anti-solvent,the as-prepared FAPbBr3 PNC films with a QD monolayer on the surface exhibit improved photoluminescence quantum yield,enhanced photostability and better *** from these advantages,the peak luminance and the maximum external quantum efficiency of the PeLED containing QD monolayer are increased from 6807 cd/m^(2)to 86,670 cd/m^(2)and 2.4%to 7.1%,*** T50 lifetime under the initial luminance of 1021 cd/m^(2)approaches 83 *** on electrical field simulation and transient electroluminescence measurements,the enhanced stability can be mainly attributed to the electrical field redistribution induced by the QD *** work demonstrates that the combination of QDs and perovskites provides an effective strategy to address the operational stability of *** insights into electrical field distribution effect will make great impact on stability improvement of other perovskite based devices.

关键词： Perovskite nanocrystals Quantum dots Electrical field distribution Light-emitting diodes Operational stability

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Holographic images of a charged black hole in Lorentz symmetry breaking massive gravity

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Science China(physics,Mechanics & Astronomy) 2025年第2期68卷 59-72页

作者： Xiao-Xiong Zeng Li-Fang Li Pan Li Bo Liang Peng Xu college of physics and Electronic engineering Chongqing Normal UniversityChongqing 401331China Department of Mechanics Chongqing Jiaotong UniversityChongqing 400074.China Center for Gravitational Wave Experiment National Microgravity LaboratoryInstitute of MechanicsChinese Academy of SciencesBeijing 100190China Lanzhou Center of Theoretical physics Lanzhou UniversityLanzhou 730000China

Using the AdS/CFT correspondence,this paper investigates the holographic images of a charged black hole within the context of Lorentz symmetry breaking massive *** photon rings,luminosity-deformed rings,or light points from various observational perspectives are *** also study the influences of both the chemical potential and temperature on the Einstein *** the previous work,which primarily examines the effect of chemical potential on ring radius at high temperatures and find no change in the radius with varying chemical potential,we also investigate the effect of chemical potential on the ring radius at low temperature besides at high *** findings indicate that at low temperatures,the photon ring radius decreases with increasing of chemical potential,while at high temperatures,the results are consistent with previous ***,we explore the impact of the model parameterλon the Einstein ring radius and find the the ring radius increases as the model parameterλ*** interestingly,for the large chemical potential,u=1,the temperature dependence of the photon ring radius is reversed forλ=2 andλ=***,for a small chemical potential u=0.1,the temperature dependence of the Einstein ring stays the same asλ=2 andλ=4.

关键词： AdS/CFT correspondence holographic images massive gravity black holes

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Compact source for quadripartite deterministically entangled optical fields

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Fundamental Research 2025年第1期5卷 132-137页

作者： Yanhong Liu Yaoyao Zhou Liang Wu Jiliang Qin Zhihui Yan Xiaojun Jia Department of physics Taiyuan Normal UniversityJinzhong 030619China Institute of Computational and Applied physics Taiyuan Normal UniversityJinzhong 030619China State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China college of information engineering Shanxi Vocational University of Engineering Science and TechnologyJinzhong 030619China

Since entangled multiple optical fields were identified as the building blocks of quantum networks,the quadripartite entangled optical fields have been produced by using four degenerate optical parametric amplifiers or two nondegenerate optical parametric amplifiers(NOPAs).However,realizing an efficient and compact source for multiple quantum users has remained an outstanding challenge,hindering their practical ***,we proposed a compact and feasible scheme to deterministically entangle four spatially separated optical fields,employing only a single ***,two-sided output NOPA-based optical fields were coupled on a beam splitter network to form the quadripartite entangled state,causing the deterministic generation of both the Greenberger–Horne–Zeilinger(GHZ)and the linear cluster states in this compact entanglement *** also obtained the optimal experimental parameters based on the simulation results,thereby providing a direct reference for experimental *** findings propose that the resultant GHZ and linear cluster states can be potentially applied in quantum-enhanced information science,specifically in quantum secret sharing,controlled quantum teleportation networks,and quantum-entangled atomic ensemble networks.

关键词： Quadripartite entanglement Single NOPA Compact source GHZ state Cluster state

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Effects of Building Blocks and Defects on the Performance of Two-Dimensional Photonic Crystal Sensors for Black Liquor Detection

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Journal of Analysis and Testing 2025年第01期 50-60页

作者： Jiajia Quan Yu Song Huiyu Li Fangyuan Zhao Lin Zhou Zhongyu Cai Yong Wan college of physics Science Qingdao University School of Instrumentation and Optoelectronic engineering School of Space and EnvironmentBeijing Advanced Innovation Center for Biomedical EngineeringBeihang University

In this study, to achieve convenient and sensitive detection of the concentration of the black liquor solution, we constructed two-dimensional photonic crystal sensors with a periodic arrangement of elliptical and circular pores in a hexagonal *** photonic bandgap in transverse magnetic（TM） mode was analyzed using the plane wave expansion method. This was followed by simulations to obtain absorption spectra at different concentrations of black liquor, with subsequent processing and computation. The simulation results revealed a linear correlation between the concentration of black liquor and the position of the trough in the absorption spectrum under consistent temperature conditions. Notably, as the concentration of black liquor solution increased, the position of absorption spectra trough shifted towards the low-frequency region. Through parameters optimization, we achieved a relationship equation with a linear fitting coefficient R2of 1.000. The sensitivity of the two-dimensional photonic crystal sensor composed of circular scatters with line defects in the hexagonal lattice can be as high as 508.3 nm/RIU when the mass fraction of black liquor solution ranges from 10 to 20%. These results provide an essential theoretical basis for applying photonic crystal sensors to detect black liquor concentrations. This study holds promise for the design and fabrication of high-performance photonic crystal sensors for practical applications.

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Analysis of Nuclear Structure Properties and Stellar β-decay Rates of Even–Even 106–120Zr Isotopes

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Research in Astronomy and Astrophysics 2025年第1期25卷 162-174页

作者： Abdul Kabir Jameel-Un Nabi Syeda Anmol Rida Izzah Anwaar Noor-Ul Ain Raza Hamad Almujibah Department of Space Science Institute of Space Technology University of Wah Department of Civil engineering College of EngineeringTaif University

The nuclear ground state properties of even–even106–120Zr nuclei have been investigated within the framework of the relativistic mean field （RMF） *** RMF model with density-dependent DDME2 and DDPC1interactions is utilized for the calculation of potential energy curves,the nuclear ground-state deformation parameters （β2）,neutron separation energies (S_nand S2n) and neutron skin thickness (rnp) of selected Zr ***,the β-decay properties of Zr isotopes were studied using the proton-neutron quasi-particle random phase approximation （pn-QRPA） *** include Gamow–Teller strength distributions,β-decay half-lives and stellar electron emission/positron capture *** β2values computed from the RMF model were employed in the pn-QRPA model as an input parameter for the calculations of β-decay properties for even–even106–120Zr *** stellar rates were computed using the pn-QRPA framework with three different types of deformation *** at high temperature （T9≥2） and low density (ρYe≤10～7g cm-3) values,the sum of electron emission and positron capture rates has a sizeable contribution （with positive exponents） to the stellar rates.

关键词： (stars:) supernovae: individual (r-process) abundances astroparticle physics elementary particles nuclear reactions nucleosynthesis

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Selective activation of dioxygen to singlet oxygen over La-Si co-doped TiO_(2)microspheres for photocatalytic degradation of formaldehyde

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Journal of Environmental Sciences 2025年第5期151卷 594-607页

作者： Shuaitao Li Haodi Liu Xun Hu Yanfen Fang Xiaofeng Cao Qifeng Chen School of Materials Science&engineering University of JinanJinan 250022China college of Biological and Pharmaceutical Sciences China Three Gorges UniversityYichang 443002China Technical Institute of physics and Chemistry Chinese Academy of SciencesBeijing 100190China

Volatile Organic Compounds(VOCs)are highly harmful to human beings and other organisms,and thus the elimination of VOCs is extremely ***,La-Si co-doped TiO_(2)microsphere photocatalysts,which were prepared by a hydrothermal method,exhibited high photocatalytic activity in the decomposition of formaldehyde compared with TiO_(2).The improved activity can be attributed to the promoted separation efficiency and density of the charge carriers,as verified by the electrochemical results in combination with density functional theory *** addition,the Si dopant changed the microstructure and surface acidity,while the addition of La promoted the separation efficiency of charge *** interestingly,it was found that singlet oxygen was the key species in the activation of molecular dioxygen,and it played a pivotal role in the photocatalytic decomposition of *** work provides a novel strategy for the selective activation of dioxygen for use in the decomposition of formaldehyde.

关键词： Dioxygen molecular activation La-Si co-doped TiO_(2)microspheres Formaldehyde degradation Photocatalysis

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An Off-Resonant Quantum Collision Model:Realizing a Qubit Coupled with an Effective Negative-Temperature Bath

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Chinese physics Letters 2025年第1期42卷 15-22页

作者： Wei-Bin Yan Zhong-Xiao Man Ying-Jie Zhang Yun-Jie Xia college of physics and engineering Qufu Normal UniversityQufu 273165China

The quantum collision model provides a promising tool for investigating system-bath *** studies of quantum collision models,however,are in the resonant *** quantum dynamics,the off-resonant interactions often result in exciting ***,it is important to investigate the quantum collision models in the off-resonant regime.A bath with a negative absolute temperature is expected to be instrumental in the development of thermal *** design of an effective bath with negative absolute temperature coupled to a qubit is a significant component for developing such thermal *** this study,we establish an effective negative-absolute-temperature bath coupled to a qubit with a quantum collision model in the far-off-resonant *** conduct a detailed systematic investigation of the off-resonant collision model and determine the presence of an additional constraint on the collision duration resulting from the far-off resonant *** dynamics of the collision model in the far-off-resonant regime are different from those beyond the far-off-resonant *** simulations are used to confirm the validity of the proposed approach.

关键词： dynamics. resonant collision

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Non-uniform electron density estimation based on electromagnetic wave attenuation in plasma

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Chinese physics B 2025年第1期34卷 381-386页

作者： Zhaoying Wang Lixin Guo Maixia Fu Shaoshuai Guo Yinsheng Li Key Laboratory of Grain information Processing and Control(Henan University of Technology) Ministry of EducationZhengzhou 450001China college of information Science and engineering Henan University of TechnologyZhengzhou 450001China School of physics Xidian UniversityXi’an 710071China

The surface of a high-speed vehicle reentering the atmosphere is surrounded by plasma *** to the influence of the inhomogeneous flow field around the vehicle,understanding the electromagnetic properties of the plasma sheath can be *** the electron density of the plasma sheath is crucial for understanding and achieving plasma stealth of *** this work,the relationship between electromagnetic wave attenuation and electron density is deduced *** attenuation distribution along the propagation path is found to be proportional to the integral of the plasma electron *** result is used to predict the electron density ***,the average electron density is obtained using a back-propagation neural network ***,the spatial distribution of the electron density can be determined from the average electron density and the normalized derivative of attenuation with respect to the propagation *** to traditional probe measurement methods,the proposed approach not only improves efficiency but also preserves the integrity of the plasma environment.

关键词： attenuation electromagnetic propagation plasma electron density

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Efficient OpenMP Based Z-curve Encoding and Decoding Algorithms

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Computers, Materials & Continua 2025年第1期82卷 1313-1327页

作者： Zicheng Zhou Shaowen Sun Teng Liang Mengjuan Li Fengling Xia School of Electronic Science and engineering University of Electronic Science and Technology of ChinaChengdu611731China Faculty of information engineering and Automation Kunming University of Science and TechnologyKunming650500China School of Communications information engineering Yunnan Communications Vocational and Technical CollegeKunming650500China Library Yunnan Normal UniversityKunming650500China Faculty of Civil Aviation and Aeronautics Kunming University of Science and TechnologyKunming650500China

Z-curve’s encoding and decoding algorithms are primely important in many Z-curve-based *** bit interleaving algorithm is the current state-of-the-art algorithm for encoding and decoding *** simple,its efficiency is hindered by the step-by-step coordinate shifting and bitwise *** tackle this problem,we first propose the efficient encoding algorithm LTFe and the corresponding decoding algorithm LTFd,which adopt two optimization methods to boost the algorithm’s efficiency:1)we design efficient lookup tables(LT)that convert encoding and decoding operations into table-lookup operations;2)we design a bit detection mechanism that skips partial order of a coordinate or a Z-value with consecutive 0s in the front,avoiding unnecessary iterative *** propose order-parallel and point-parallel OpenMP-based algorithms to exploit the modern multi-core *** results on discrete,skewed,and real datasets indicate that our point-parallel algorithms can be up to 12.6×faster than the existing algorithms.

关键词： Z-curve lookup table OpenMP bit detection mechanism

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A Hybrid Transfer Learning Framework for Enhanced Oil Production Time Series Forecasting

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Computers, Materials & Continua 2025年第2期82卷 3539-3561页

作者： Dalal A.L-Alimi Mohammed A.A.Al-qaness Robertas Damaševičius Department of information Technology Gulf CollegesHafr Al-Batin2600Saudi Arabia college of physics and Electronic information engineering Zhejiang Normal UniversityJinhua321004China college of engineering and information Technology Emirates International UniversitySana’a16881Yemen Department of Applied Informatics Vytautas Magnus UniversityAkademija44404Lithuania

Accurate forecasting of oil production is essential for optimizing resource management and minimizing operational risks in the energy sector. Traditional time-series forecasting techniques, despite their widespread application, often encounter difficulties in handling the complexities of oil production data, which is characterized by non-linear patterns, skewed distributions, and the presence of outliers. To overcome these limitations, deep learning methods have emerged as more robust alternatives. However, while deep neural networks offer improved accuracy, they demand substantial amounts of data for effective training. Conversely, shallow networks with fewer layers lack the capacity to model complex data distributions adequately. To address these challenges, this study introduces a novel hybrid model called Transfer LSTM to GRU (TLTG), which combines the strengths of deep and shallow networks using transfer learning. The TLTG model integrates Long Short-Term Memory (LSTM) networks and Gated Recurrent Units (GRU) to enhance predictive accuracy while maintaining computational efficiency. Gaussian transformation is applied to the input data to reduce outliers and skewness, creating a more normal-like distribution. The proposed approach is validated on datasets from various wells in the Tahe oil field, China. Experimental results highlight the superior performance of the TLTG model, achieving 100% accuracy and faster prediction times (200 s) compared to eight other approaches, demonstrating its effectiveness and efficiency.

关键词： Time series forecasting gaussian transformation quantile transformation long short-term memory gated recurrent units

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