检索结果-内蒙古大学图书馆

arXiv 2023年

作者： Kedziora, David Jacob Musial, Anna Rudno-Rudziński, Wojciech Gabrys, Bogdan Complex Adaptive Systems Lab. University of Technology Sydney Sydney Australia Department of Experimental Physics Wroclaw University of Science and Technology Wroclaw Poland

Novel methods for rapidly estimating single-photon source (SPS) quality have been promoted in recent literature to address the expensive and time-consuming nature of experimental validation via intensity interferometry. However, the frequent lack of uncertainty discussions and reproducible details raises concerns about their reliability. This study investigates the use of data augmentation, a machine learning technique, to supplement experimental data with bootstrapped samples and quantify the uncertainty of such estimates. Eight datasets obtained from measurements involving a single InGaAs/GaAs epitaxial quantum dot serve as a proof-of-principle example. Analysis of one of the SPS quality metrics derived from efficient histogram fitting of the synthetic samples, i.e. the probability of multi-photon emission events, reveals significant uncertainty contributed by stochastic variability in the Poisson processes that describe detection rates. Ignoring this source of error risks severe overconfidence in both early quality estimates and claims for state-of-the-art SPS devices. Additionally, this study finds that standard least-squares fitting is comparable to using a Poisson likelihood, and expanding averages show some promise for early estimation. Also, reducing background counts improves fitting accuracy but does not address the Poisson-process variability. Ultimately, data augmentation demonstrates its value in supplementing physical experiments;its benefit here is to emphasise the need for a cautious assessment of SPS quality. Copyright © 2023, The Authors. All rights reserved.

关键词： Uncertainty analysis

来源：评论

学校读者我要写书评

暂无评论

Effect of Cations on the Structural, Optoelectronic, and Thermoelectric Properties of Amg2n2 (a = Yb, Sm, EU) Zintl Compounds;an Ab-Initio Study

SSRN

引用

SSRN 2024年

作者： Usman, Tariq Khan, Sajid Murtaza, Ghulam Khan, Dil Faraz Khan, Salman Ali Li, Xiaojie Department of Physics Qilu Institute of Technology Shandong Jinan250200 China Department of Physics University of Science and Technology Bannu Bannu28100 Pakistan Materials Modeling Lab Department of Physics Islamia College Peshawar Khyber Pakhtunkhwa25120 Pakistan School of Materials Science & Engineering Zhejiang University Hangzhou310027 China

Zintl phases are prominent for their attribution to optical and thermoelectric meeds. AMg2N2 (A = Yb, Sm, Eu) compounds of the zintl family were investigated through first-principles studies for structural, electronic, optical, and thermoelectric properties. Potential functionals;PBE-GGA, TB-mBJ, and Hybrid (YS-PBE0) were used to study these compounds. The behavior of all compounds YbMg2N2, SmMg2N2, and EuMg2N2 was semiconducting with band gaps 2.95 eV, 0.74 eV, and 1.04 eV respectively through YS-PBE0. The density of states (DOS) study reveals that the leading role was offered by A-d orbitals to construct conduction bands and by A-f orbitals to form valence bands. The optical nature of these materials was studied from the optical parameters like;dielectric function Ε(ω), refractive index n(ω), energy loss function L(ω), absorption coefficient α(ω), extension coefficient k(ω), reflectivity R(ω), and optical conductivity Σ(ω). From this study, it is revealed that these samples are active in the visible and ultra-violet (UV) regions, due to which these materials are supposed to be suitable candidates for optoelectronic applications. Furthermore, the thermoelectric character of the titled compounds was scrutinized through the BoltzTraP2 code. The thermoelectric efficiency in the form of thermoelectric figure of merit (ZT) of AMg2N2 (A = Yb, Sm, Eu) compounds are achieved 1.17, 0.64, and 0.43 respectively at somehow high temperature 950 K. From ZT and optimized level of carriers’ concentrations, these materials are considered to be efficient thermoelectric. © 2024, The Authors. All rights reserved.

关键词： Samarium compounds

来源：评论

学校读者我要写书评

暂无评论

Accurate calculation of bubble and droplet properties in diffuse-interface two-phase simulations

arXiv

引用

arXiv 2025年

作者： Nathan, Pranav J. Jain, Suhas S. Flow Physics and Computational Science Lab George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology AtlantaGA United States

In this paper, we address the challenge of accurately calculating droplet/bubble properties (e.g., volume, number) in diffuse-interface two-phase flow simulations. Currently, flood-fill algorithms can truncate a significant portion of the volume of droplets/bubbles contained within the diffuse interface region or artificially merge multiple droplets/bubbles. This error is also dependent on the volume fraction cutoff value, which is typically chosen to be 0.5 arbitrarily, in the flood-fill algorithms. We propose a simple volume-correction approach that incorporates an analytical approximation of the truncated volume to correct for the missing droplet/bubble volumes. This proposed method results in accurately recovering the dispersed phase volumes with minimal volume error over a wide range of volume fraction cutoff values;and hence, can also accurately recover the number of droplets/bubbles. This can be a valuable tool for accurate calculation of drop/bubble size distributions for analysis and for Eulerian-to-Lagrangian conversion of the dispersed phase in multi-scale modeling approaches. © 2025, CC BY.

关键词： Two phase flow

来源：评论

学校读者我要写书评

暂无评论

Dual semi-Dirac cones in three-dimensional photonic crystals

引用

Physical Review B 2024年第12期109卷 125432-125432页

作者： Mingyan Li Ran Mei Dongyang Yan Zhikai Ma Fang Cao Yadong Xu Changqing Xu Jie Luo Institute of Theoretical and Applied Physics School of Physical Science and Technology Soochow University Suzhou 215006 China Provincial Key Lab of Thin Films Soochow University Suzhou 215006 China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of Physics Peking University Beijing 100871 China Laboratory Development and Management Centre & School of Optical and Electronic Information Suzhou City University Suzhou 215104 China School of Physics and Technology Nanjing Normal University Nanjing 210023 China

Semi-Dirac cones, characterized by linear-parabolic dispersions, endow photonic crystals with many fascinating properties, such as topological transitions and anisotropic electromagnetic responses. While most preceding investigations concentrated on two-dimensional systems, our exploration of three-dimensional photonic crystals comprising a cubic lattice of core-shell spheroids unveils unusual dispersions in three-dimensional systems—dual semi-Dirac cones. The dual semi-Dirac cones arising from a pair of coexisting triply degenerate modes can be analyzed by effective-Hamiltonian and effective-medium theory, accompanied by topological transitions in equal-frequency surfaces and significant changes in electromagnetic responses. We find that the photonic crystal exhibits highly anisotropic wave transport properties, i.e., drastically different transport properties for waves of different wave-vector directions, within the frequency region between the two semi-Dirac frequencies. However, at the frequencies of semi-Dirac points, the photonic crystal behaves as an effective double-zero medium for two propagation directions, but as a single-zero medium for the remaining direction, specifically for orthogonal polarizations. Our findings contribute valuable insights into three-dimensional artificial materials, presenting features absent in two-dimensional systems.

关键词： Photonic crystals Metamaterials Effective medium approach Electromagnetic wave theory

来源：评论

学校读者我要写书评

暂无评论

Effect of electron correlation on trielectronic-recombination rate coefficients for Be-like argon

引用

Physical Review A 2023年第2期108卷 022801-022801页

作者： Chun Yu Zhang Si Jie Wu Kai Wang Ran Si Ke Yao Zhong Kui Huang Wei Qiang Wen Xin Wen Ma Chong Yang Chen N. R. Badnell Department of Physics University of Strathclyde Glasgow G4 0NG United Kingdom Shanghai EBIT Lab Key Laboratory of Nuclear Physics and Ion-beam Application Institute of Modern Physics Department of Nuclear Science and Technology Fudan University Shanghai 200433 China Department of Physics and Anhui Key Laboratory of Optoelectric Materials Science and Technology Key Laboratory of Functional Molecular Solids Ministry of Education Anhui Normal University Wuhu Anhui 241000 China Hebei Key Lab of Optic-electronic Information and Materials The College of Physics Science and Technology Hebei University Baoding 071002 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China

The merged-beam rate coefficients of dielectronic and trielectronic recombinations (DR and TR) within ΔN=0 channels for Be-like Ar14+ were measured by Huang etal. [Astrophys. J. Supp. Ser. 235, 2 (2018)] at the cooler storage ring in Lanzhou, China. Meanwhile, theoretical data were also calculated with autostructure (AS) code for comparison with the measured resonance spectrum. However, the AS calculations significantly underestimated TR resonance strengths in most cases. In the present work, we find that the electron correlation between DR and TR resonance states with different captured electron principal quantum numbers (n) for the captured electrons (multi-n CI) can significantly increase the strength of TR resonances with n=6 and 7, which is confirmed through the relativistic distorted-wave (RDW) approximation in the flexible atomic code (FAC) and the semirelativistic distorted-wave (SRDW) approximation in the AS. The corresponding plasma rate coefficients show a significant increase and are in better agreement with the experiment, with differences from the experiment reduced to ∼10% in both photoionized plasmas (PP) and collisionally ionized plasmas (CP) temperature ranges, as opposed to the previous theoretical results that exhibited differences of up to ∼30% over the same temperature ranges. Taking into account the multi-n CI could account for most of the discrepancy between existing theoretical calculations and experimental results. Understanding electron correlation and its consequences is important for obtaining accurate TR rate coefficients that will be useful for modelers assessing its role in describing non-local thermodynamic equilibrium astrophysical plasma.

关键词： Atomic systems

来源：评论

学校读者我要写书评

暂无评论

Time-dependent invasion laws for a liquid-liquid displacement system

arXiv

引用

arXiv 2024年

作者： Xiao, Ke Wu, Chen-Xu Department of Physics College of Physical Science and Technology Xiamen University Xiamen361005 China Fujian Provincial Key Lab for Soft Functional Materials Research Research Institute for Biomimetics and Soft Matter Department of Physics College of Physical Science and Technology Xiamen University Xiamen361005 China

Capillary-driven flow of fluids occurs frequently in nature and has a wide range of technological applications in the fields of industry, agriculture, medicine, biotechnology, and microfluidics. By using the Onsager variational principle, we propose a model to systematically study the capillary imbibition in titled tubes, and find different laws of time-dependent capillary invasion length for liquid-liquid displacement system other than Lucas-Washburn type under different circumstances. The good agreement between our model and experimental results shows that the imbibition dynamics in a capillary tube with a prefilled liquid slug can be well captured by the dynamic equation derived in this paper. Our results bear important implications for macroscopic descriptions of multiphase flows in microfluidic systems and porous media. Copyright © 2024, The Authors. All rights reserved.

关键词： Porous materials

来源：评论

学校读者我要写书评

暂无评论

Gamow shell model description of neutron-rich He hyper-isotopes

arXiv

引用

arXiv 2024年

作者： Li, Xin Michel, N. Li, J.G. Zhou, Xian-Rong Department of Physics East China Normal University Shanghai200241 China Heavy Ion Science and Technology Key Lab Institute of Modern Physics Chinese Academy of Sciences Lanzhou730000 China School of Nuclear Science and Technology University of Chinese Academy of Sciences Beijing100049 China

The Gamow shell model (GSM) framework has been extended to the study of weakly bound hypernuclei. As a first application, the neutron-rich He hyper-isotope chains, from 6ΛHe to 9ΛHe have been investigated to accurately account for the loosely bound or neutron-unbound character of hypernuclear many-body states. The energy spectra calculated with a phenomenological Hamiltonian show good agreement with experimental data. In particular, neutron-emitting resonant states are predicted for the neutron-rich nuclei 5−7He and the hypernucleus 6ΛHe. Furthermore, one-neutron densities exhibit the long-range character of weakly bound and resonant states. This study demonstrates that GSM is a practical tool for describing the complex structure of hypernuclei, especially for those close to drip lines. © 2024, CC BY.

关键词： Hamiltonians

来源：评论

学校读者我要写书评

暂无评论

Enhanced specific capacitance, structural, optical, and morphological study of carbon ions incorporated into the lattice of ZrCuO₂ nanoparticle synthesized by hydrothermal method

Hybrid Advances

引用

Hybrid Advances 2024年 5卷

作者： Hussain, Azmat Ali, Fawad Ahmed, Hafiz Hammad Abbas khan Siddiqi, Jamil ur Rehman Ikhioya, Imosobomeh L. National Centre for Physics Quaid-i-Azam University Campus Islamabad 44000 Pakistan Department of Physics Hazara University Mansehra Pakistan National Institute of Vacuum Science and Technology Islamabad 44000 Pakistan Centre of Excellence in Solid State Physics University of the Punjab Lahore Pakistan Department of Physics Abbottabad University of Science and Technology Abbottabad Pakistan Department of Physics and Astronomy University of Nigeria Nsukka 410001 Nigeria

In this study, ZrCuO2 nanoparticles were made using the hydrothermal method and potassium hydroxide as the precipitant. The material was irradiated with 500 keV carbon (C++) ions at doses of 1 × 1014, 1 × 10... 详细信息

In this study, ZrCuO₂ nanoparticles were made using the hydrothermal method and potassium hydroxide as the precipitant. The material was irradiated with 500 keV carbon (C⁺⁺) ions at doses of 1 × 10¹⁴, 1 × 10¹⁶, and 1 × 10¹⁸ ions/cm². The ZrCuO₂ nanoparticles exhibited cubic crystal structures with clear peaks on different orientation planes, both before and after being irradiated with carbon ions (C⁺⁺). By incorporating carbon ions, the peak intensity and crystallinity of CuO nanostructures were enhanced. The non-irradiated micrographs display groups of tiny pebbles, whereas the carbon ion irradiated ZrCuO₂ nanoparticles show flake-like structures. The material became denser because of carbon ion irradiation, which increased the carrier concentration. The absorption rate increase of the material reveals the impact of a carbon ion on irradiated ZrCuO₂ nanoparticles. The absorbance of ZrCuO₂ nanoparticles is enhanced through carbon ion implantation. The material has a bandgap energy of 1.95 eV without irradiation. The bandgap energy range of the irradiated material is 1.55–1.82 eV. The energy bandgap of the synthesized material was reduced because of carbon ion irradiation. The ZrCuO₂ nanoparticle electrode with a specific capacitance value of 225 F/g. The electrodes prepared at 500 keV carbon (C⁺⁺) ions with dosages of 1 × 10¹⁴, 1 × 10¹⁶, and 1 × 10¹⁸ ions/cm² yielded specific capacitance values of 275 F/g, 300 F/g, and 312.5 F/g, respectively. © 2024 The Authors

关键词： Bandgap Carbon ions Copper oxide Hydrothermal Zirconium

来源：评论

学校读者我要写书评

暂无评论

Insights on the mechanism of Na-ion storage in expanded graphite anode

引用

Journal of Energy Chemistry 2021年第2期30卷 56-62,I0003页

作者： Xiaodan Li Zhibin Liu Jinliang Li Hang Lei Wenchen Zhuo Wei Qin Xiang Cai Kwun Nam Hui Likun Pan Wenjie Mai Siyuan Laboratory Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy MaterialsDepartment of PhysicsJinan UniversityGuangzhou 510632GuangdongChina Shanghai Key Laboratory of Magnetic Resonance School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200062China Department of Chemistry Jinan UniversityGuangzhou 510632GuangdongChina College of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410114HunanChina Department of Light Chemical Engineering Guangdong PolytechnicFoshan 528041GuangdongChina Institute of Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipaMacao 999078China

Currently,Na-ion battery(NIB) has become one of the most potential alternatives for Li-ion batteries due to the safety and low *** a promising anode for Na-ion storage,expanded graphite has attracted considerable ***,the sodiation-desodiation process is still *** our work,we obtain expanded graphite through slight modified Hummer's method and subsequent thermal treatment,which exhibits excellent cycling *** at a high current density of 1 A g^(-1),our expanded graphite still remains a high reversible capacity of 100 mA h g^(-1) after 2600 ***,we also investigate the electrochemical mechanism of our expanded graphite for Na-ion storage by operando Raman technique,which illuminate the electrochemical reaction during different sodiation-desodiation processes.

关键词： Expanded graphite Sodiation-desodiation process Operando Raman spectroscopies Na-ion batteries

来源：评论

学校读者我要写书评

暂无评论

Simulation of a dual-polarized printed dipole antenna with a rectagular cavity 11

Simulation of a dual-polarized printed dipole antenna with a...

引用

11th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2023 - Proceedings

作者： Wang, Qian Zhang, Jianchuan Liu, Jiaqi Fang, Zhongyi Fang, Liang Zhang, Junrui The Research Institute for Special Structures of Aeronautical Composite Avic The Aeronautical Science Key Lab for High Performance Electromagnetic Windows Shandong Ji'nan China School of Information Science and Engineering Harbin Institute of Technology at Weihai Weihai264209 China Beijing Institute of Space Long March Vehicle National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematics Beijing100076 China Shandong University at Weihai Weihai264209 China

ISBN: (纸本)9798350326277

This paper presents the design of a dual-polarized printed dipole antenna operating at 2GHz. In order to enhance the radiation characteristics of the antenna, a rectangular metallic cavity is positioned beneath the printed dipole *** antenna utilizes an exponentially tapered geometric shape for the printed dipole radiator, and it is fed using CPW technology. To mitigate mutual interference between the feeding structures, a bridge structure is implemented for one of the polarization ports. Electromagnetic simulation is conducted to evaluate the performance of the dual-polarized antenna. © 2023 IEEE.

关键词： dipole antenna dual-polarized antenna printed antenna rectangular cavity

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：