检索结果-内蒙古大学图书馆

arXiv 2024年

作者： Gao, Yi Center for Quantum Transport and Thermal Energy Science Jiangsu Key Lab on Opto-Electronic Technology School of Physics and Technology Nanjing Normal University Nanjing210023 China

We investigate the superconducting pairing symmetry in pressurized La3Ni2O7 based on a bilayer two-orbital model. There are two symmetric bands α and γ, as well as two antisymmetric ones β and δ. It is found that the γ band induces considerable ferromagnetic spin fluctuation and prefers an odd-frequency, s-wave spin triplet pairing state. The addition of the other bands gradually suppresses the ferromagnetic spin fluctuation and enhances the antiferromagnetic ones. The superconducting pairing then evolves from a spin triplet into a d-wave spin singlet, and finally into an s±-wave one. The competition between the d-wave and s±-wave pairings relies on whether the ferromagnetic spin fluctuation is suppressed completely or not. Copyright © 2024, The Authors. All rights reserved.

关键词： Ferromagnetism

来源：评论

学校读者我要写书评

暂无评论

Development and application of lunar sample unsealing and processing equipment

Development and application of lunar sample unsealing and pr...

引用

2020 International Conference on Mechatronics technology and Intelligent Manufacturing, ICMTIM 2020

作者： Wang, Jin Wang, Chunyong Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou Gansu730000 China

The main goal of exploring outer space is to collect samples of extraterrestrial objects and return samples to Earth. Our country is going to launch the Chang'e-5 Lunar Probe Task to collect lunar samples and bring them back to Earth for sample analysis. Unsealing the vacuum lunar sample container and protecting the sample with high-purity nitrogen at the same time become problems urgently. This paper introduces one kind of equipment for unsealing and processing the vacuum lunar sample container in Chang'e-5 Lunar Probe Task. This equipment is divided into four parts: transfer chamber, operating chamber, unsealing chamber and purification unit, which can unseal samples with a vacuum of 10-3Pa and keep lunar samples in an environment protected by high-purity nitrogen with a water concentration less than 30ppm and an oxygen concentration less than 20ppm. © 2020 Institute of physics Publishing. All rights reserved.

关键词： Containers

来源：评论

学校读者我要写书评

暂无评论

B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source

引用

Nuclear science and Techniques 2024年第8期35卷 1-11页

作者： Li, Qiang Wang, Li-Jiao Tang, Jing-Yu Qiu, Xiang-Biao Chen, Zhen Zhao, Mao-Yuan Ning, Chang-Jun Pan, Kai Xu, Wei Li, Tao Lu, Su-Peng Yi, Han Fan, Rui-Rui Feng, Chang-Qing Zhang, Rong Sun, Xiao-Yang An, Qi Bai, Hao-Fan Bai, Jiang-Bo Bao, Jie Cao, Ping Chen, Qi-Ping Chen, Yong-Hao Cui, Zeng-Qi Fan, An-Chuan Feng, Fan-Zhen Gu, Min-Hao Han, Chang-Cai Han, Zi-Jie He, Guo-Zhu He, Yong-Cheng Hong, Yang Hu, Yi-Wei Huang, Han-Xiong Jiang, Wei Jiang, Zhi-Jie Jin, Zheng-Yao Kang, Ling Li, Bo Li, Gong Li, Xiao Li, Yang Liu, Jie Liu, Rong Liu, Shu-Bin Liu, Yi-Na Luan, Guang-Yuan Ren, Jie Ren, Zhi-Zhou Ruan, Xi-Chao Song, Zhao-Hui Sun, Kang Tan, Zhi-Xin Tang, Sheng-Da Wang, Jin-Cheng Wang, Peng-Cheng Wang, Zhao-Hui Wen, Zhong-Wei Wu, Xiao-Guang Wu, Xuan Xia, Cong Yu, Yong-Ji Zhang, Guo-Hui Zhang, Hang-Chang Zhang, Lin-Hao Zhang, Qi-Wei Zhang, Xian-Peng Zhang, Yu-Liang Zhang, Yue Zhang, Zhi-Yong Zhou, Zhi-Hao Zhu, Ke-Jun Zou, Chong Institute of High Energy Physics Chinese Academy of Sciences (CAS) Beijing China Spallation Neutron Source Science Center Dongguan China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of Sciences Beijing China Dongguan Songshan Lake Future School Dongguan China School of Nuclear Science and Technology University of Science and Technology of China Hefei China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei China North Night Vision Science and Technology (Nanjing) Research Institute Co. Ltd Nanjing China Department of Modern Physics University of Science and Technology of China Hefei China State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing China Institute of Modern Physics Fudan University Shanghai China Key Laboratory of Nuclear Data China Institute of Atomic Energy Beijing China China Academy of Engineering Physics Institute of Nuclear Physics and Chemistry Mianyang China USTC archaeometry lab University of Science and Technology of China Hefei China Northwest Institute of Nuclear Technology Xi’an China University of Chinese Academy of Sciences Beijing China China Shipbuilding Trading Co. Ltd Beijing China

Neutron resonance imaging (NRI) has recently emerged as an appealing technique for neutron radiography. Its complexity surpasses that of conventional transmission imaging, as it requires a high demand for both a neutron source and detector. Consequently, the progression of NRI technology has been sluggish since its inception in the 1980s, particularly considering the limited studies analyzing the neutron energy range above keV. The white neutron source (Back-n) at the China Spallation Neutron Source (CSNS) provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to MeV. Neutron-sensitive microchannel plates (MCP) have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions, high detection efficiency, and low noise. In this study, we report the development of a $$^{10}$$ B-doped MCP detector, along with its associated electronics, data processing system, and NRI experiments at the Back-n. Individual heavy elements such as gold, silver, tungsten, and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range; the more difficult medium-weight elements such as iron, copper, and aluminum with resonance peaks in the 1–100 keV energy range can also be identified. In particular, results in the neutron energy range of dozens of keV (Aluminum) are reported here for the first time.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Numerical Simulation and Design of a Lunar Sample Unsealing and Processing Equipment 3

Numerical Simulation and Design of a Lunar Sample Unsealing ...

引用

2020 3rd International Conference on Mechatronics and Computer technology Engineering, MCTE 2020

作者： Jin, Wang Zhenlin, Wang Chunjie, Yan Xuesong, Wang Chunyong, Wang Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou Gansu730000 China

Lunar Sample Unsealing and Processing Equipment (LSUPE) is an equipment which is used to vacuum unseal the vacuum Lunar Sample Container (VLSC) and to take pictures, weigh and process lunar samples. LSUPE is mainly composed of four parts, the transfer chamber, operate chamber, unseal chamber and gas purification system. The operate chamber needs to maintain a high-purity nitrogen environment all the times to prevent samples from being polluted by the atmosphere which affects subsequent analysis of the samples. The unseal chamber switches vacuum environment to high-purity nitrogen environment. The high-purity nitrogen environment ensures that the sample is not contaminated after unsealing, and the vacuum environment ensures that the VLSC can be unsealed. In order to ensure that the water and oxygen concentration indexes in the two chambers meet the requirements at all times after the lunar sample is unsealed, this paper gives the LSUPE simulation design process, and establishes a simulation calculation model for the water and oxygen concentration. The calculation results show that the internal water and oxygen concentrations of LSUPE are better than 10ppm in any state, which meets the requirements for storage and processing lunar samples. © Published under licence by IOP Publishing Ltd.

关键词： Nitrogen

来源：评论

学校读者我要写书评

暂无评论

One-Step Residual Shifting Diffusion for Image Super-Resolution via Distillation

arXiv

引用

arXiv 2025年

作者： Selikhanovych, Daniil Li, David Leonov, Aleksei Gushchin, Nikita Kushneriuk, Sergei Filippov, Alexander Burnaev, Evgeny Koshelev, Iaroslav Korotin, Alexander HSE University Russia Yandex Research AI Foundation Algorithm Lab Skolkovo Institute of Science and Technology Russia Moscow Institute of Physics and Technology Russia Artificial Intelligence Research Institute

Diffusion models for super-resolution (SR) produce high-quality visual results but require expensive computational costs. Despite the development of several methods to accelerate diffusion-based SR models, some (e.g., SinSR) fail to produce realistic perceptual details, while others (e.g., OSEDiff) may hallucinate non-existent structures. To overcome these issues, we present RSD, a new distillation method for ResShift, one of the top diffusion-based SR models. Our method is based on training the student network to produce such images that a new fake ResShift model trained on them will coincide with the teacher model. RSD achieves single-step restoration and outperforms the teacher by a large margin. We show that our distillation method can surpass the other distillation-based method for ResShift - SinSR - making it on par with state-of-the-art diffusion-based SR distillation methods. Compared to SR methods based on pre-trained text-to-image models, RSD produces competitive perceptual quality, provides images with better alignment to degraded input images, and requires fewer parameters and GPU memory. We provide experimental results on various real-world and synthetic datasets, including RealSR, RealSet65, DRealSR, ImageNet, and DIV2K. Copyright © 2025, The Authors. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Compact Optical Frequency Standard Based on 87Rb D1 Line

Compact Optical Frequency Standard Based on 87Rb D1 Line

引用

European Frequency and Time Forum (EFTF)

作者： Jingming Chen Jie Miao Qiaohui Yang Tianyu Liu Zhendong Chen Duo Pan Jiqing Lian Jingbiao Chen State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of Physics Lanzhou China School of Mechano-Electronic Engineering Xidian University Xi'an China Hefei National Laboratory Hefei China

ISBN: (数字)9798350354270

ISBN: (纸本)9798350354287

In this paper, we investigate the modulation transfer spectroscopy (MTS) of 87Rb D1 line under noncycling transitions. The line shape of the MTS signal was determined, and the system's long-term stability was measured. Results showed that the system consistently performed at a short-term and long-term stability of E-14 level estimated from the residual error signal, indicating high performance of the compact optical frequency standard.

关键词： Laser theory Time-frequency analysis Spectroscopy Shape Atomic beams Shape measurement Laser stability Adaptive optics Standards physics

来源：评论

学校读者我要写书评

暂无评论

Moiré pattern assisted commensuration resonance in disordered twisted bilayer graphene

引用

Physical Review B 2024年第8期109卷 085412-085412页

作者： Zhe Hou Ya-Yun Hu Guang-Wen Yang Zhejiang Lab Hangzhou 311100 People's Republic of China School of Physics and Technology Nanjing Normal University Nanjing 210023 China Department of Computer Science and Technology Tsinghua University Haidian District Beijing 100084 People's Republic of China

We investigate the mesoscopic transport through a twisted bilayer graphene (TBG) consisting of a clean graphene nanoribbon on the bottom and a disordered graphene disk on the top. We show that, with strong top-layer disorder, the transmission through such a device shows a sequence of resonant peaks with respect to the rotation angle θ, where at the resonant angles θc the disk region contains one giant hexagonal moiré supercell. A further investigation shows that the value of θc shows negligible dependence on the disorder strength, the Fermi energy, and the shape distortion, indicating the resonance is a robust commensuration feature of the moiré supercell. We explain this commensuration resonance based on the bound states formed inside TBG disk as a result of the nonuniform interlayer coupling, with their average local density of states dominating at the AA stacking region while minimizing at the AB/BA stacking regions. By increasing the interlayer distance, the peak becomes less pronounced which further confirms the role of interlayer coupling. The results presented here suggest a new mechanism to tune the quantum transport signal through the twist angle in disordered moiré systems.

关键词： Electrical conductivity Disordered systems Twisted bilayer graphene Nonequilibrium Green's function Tight-binding model

来源：评论

学校读者我要写书评

暂无评论

Hybrid Quantum-Classical Algorithms for Loan-Collection Optimization with Loan-Loss Provisions

引用

Physical Review Applied 2023年第6期19卷 064001-064001页

作者： Jirawat Tangpanitanon Jirawat Saiphet Pantita Palittapongarnpim Poompong Chaiwongkhot Pinn Prugsanapan Nuntanut Raksasri Wipada Wannasiwaporn Yarnvith Raksri Pairash Thajchayapong Thiparat Chotibut Quantum Technology Foundation (Thailand) Bangkok Thailand Thailand Center of Excellence in Physics Ministry of Higher Education Science Research and Innovation Bangkok Thailand Optical and Quantum Physics Laboratory Department of Physics Faculty of Science Mahidol University Bangkok Thailand Chula Intelligent and Complex Systems Lab Department of Physics Faculty of Science Chulalongkorn University Bangkok Thailand Kasikorn Business-Technology Group Bangkok Thailand

Banks are required to set aside funds in their income statement, known as a loan-loss provision (LLP), to account for potential loan defaults and expenses. By treating the LLP as a global constraint, we propose a hybrid quantum-classical algorithm to solve a specific case of quadratic constrained binary optimization (QCBO) models for loan-collection optimization. The objective is to find a set of optimal loan-collection actions that maximizes the expected net profit presented to the bank as well as the financial welfare in the financial network of loanees, while keeping the LLP at its minimum. Our algorithm consists of three parts: a classical divide-and-conquer algorithm to enable a large-scale optimization, a quantum alternating operator ansatz (QAOA) algorithm to maximize the objective function, and a classical sampling algorithm to handle the LLP. We apply the algorithm to a real-world data set with 600 loanees and five possible collection actions. The QAOA is performed using up to 35 qubits on a classical computer. We show that incorporating the QAOA can enhance the expected net profit by approximately 70% in comparison to scenarios where the QAOA is absent from the hybrid algorithm. Although this improvement does not constitute definitive evidence of quantum advantage, our work illustrates the use of near-term quantum devices to tackle real-world optimization problems.

关键词： Adiabatic quantum optimization Econophysics Optimization problems Quantum algorithms

来源：评论

学校读者我要写书评

暂无评论

Three-Layer Matrix Ring Data Center Interconnect Based on FSO technology

Three-Layer Matrix Ring Data Center Interconnect Based on FS...

引用

2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and Optical Communications, IPOC 2024

作者： Su, Jianning Kong, Qian Lu, Xiaowei Liu, Liming Yi, Zichuan Pan, Xinjian School of Electronic and Information Engineering University of Electronic Science and Technology of China Zhongshan Institute Zhongshan528402 China College of Physics and Optoelectronic Engineering Shenzhen University SZU Shenzhen 518060 China Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province Shenzhen Key Lab of Micro-Nano Photonic Information Technology State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China

This paper proposes a three-layer grid matrix ring data center interconnect using Free Space Optical Communication as the inter-layer connection technology, which simplifies the wiring complexity and offers more diver... 详细信息

ISBN: (纸本)9798350379266

关键词： Data communication systems

来源：评论

学校读者我要写书评

暂无评论

Polar Phase Formation and Piezoelectricity of PVDF by Hot-pressing under Electrostatic Intermolecular Interactions

引用

Chinese Journal of Polymer science 2022年第7期40卷 799-806页

作者： Jing-Hua Zhao Bao-Sheng He Ao-Shen Li Chao-Nan Wang Qing-Qing Li Zhi-Jun Hu Center for Soft Condensed Matter Physics and Interdisciplinary Research Soochow UniversitySuzhou215123China School of Optoelectronics Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou215006China Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of China Soochow UniversitySuzhou215006China

Piezoelectric poly(vinylidene fluoride)(PVDF)has received considerable attention due to its ability of interconverting mechanical into electric energies and potential applications in wearable *** achieve piezoelectricity,it is important to simultaneously control the formation of polar phases,crystallinity,and dipole alignments in PVDF-based *** we demonstrate that piezoelectricity can be obtained by directly hot-pressing PVDF films sandwiched between chitosan or cellulose *** electrostatic interactions between PVDF and chitosan or cellulose enabled an exceptional high content of polar phases(β-andγ-phases)up to 90%and a measured piezoelectric charge coefficient d_(33)of up to-30 pC/*** study provides a simple and low-cost approach for obtaining piezoelectric PVDF films used for sensors,actuators,and energy harvesters.

关键词： Poly(vinylidene fluoride) Piezoelectricity Electrostatic interactions Hot-pressing

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：