检索结果-南通市图书馆

CSHINE for studies of HBT correlation in heavy ion reactions

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2021年第1期32卷 27-34页

作者： Yi-Jie Wang Fen-Hai Guan Xin-Yue Diao Qiang-Hua Wu xiang-lun wei He-Run Yang Peng Ma Zhi Qin Yu-Hao Qin Dong Guo Rong-Jiang Hu Li-Min Duan Zhi-Gang Xiao Department of Physics Tsinghua UniversityBeijing 100084China Institute of Modern Physics Lanzhou 730000China

The compact spectrometer for heavy ion experiment(CSHINE)is under construction for the study of isospin chronology via the Hanbury Brown–Twiss(HBT)particle correlation function and the nuclear equation of state of asymmetrical nuclear *** CSHINE consists of silicon strip detector(SSD)telescopes and large-area parallel-plate avalanche counters,which measure the light charged particles and fission fragments,*** phase I,two SSD telescopes were used to observe 30 MeV/u 40Ar?197Au *** results presented here demonstrate that hydrogen and helium were observed with high isotopic resolution,and the HBT correlation functions of light charged particles could be constructed from the obtained data.

关键词： Silicon strip detector Telescope HBT correlation function Nuclear equation of state

Development of a MWDC prototype of the CSR external-target experiment

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第10期35卷 121-134页

作者： Zhou-Bo He Zhi Qin Peng Ma He-Run Yang xiang-lun wei Chen-Gui Lu xiang-Jie Wen Xiu-Ling Zhang Tao Chen Zhi-Jie Li Yuan-Sheng Yang Mei-Qiang Zhan Can-Wen Liu Meng Li Tian-Li Qiu Yi-wei Gong Xin-Jie Huang Xiao-Hao Yin Zhi-Xuan He Jun-wei Zhang Hai-Chuan Zou Sheng-wei Fu Dong Guo Jun-wei Yan Zhe Cao Zhi Deng Jie Kong Zhi-Gang Xiao Rong-Jiang Hu Li-Min Duan Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Department of Physics Tsinghua UniversityBeijing 100084China University of Science and Technology of China Hefei 230026China Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and TechnologySichuan UniversityChengdu 610064China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China North China University of Water Resources and Electric Power Zhengzhou 450000China

The cooling storage ring(CSR)external-target experiment(CEE)is a spectrometer used in construction to study the properties of nuclear matter in high-baryon density regions at the Heavy-Ion Research Facility in Lanzhou(HIRFL).This study presents the design,simulation,manufacturing,and testing of a half-size prototype of a multi-wire drift chamber(MWDC)for the ***,the performance of the MWDC connected to homemade electronics was *** results demonstrated that an energy resolution of 18.5% for 5.9-keV X-rays and a position resolution of 194μm for protons can be achieved by the current *** the size of the largest MWDC reached 176 cm×314 cm,a set of 98 cm×98 cm prototypes was built using the new *** positioning accuracy of the anode wires in this prototype is better than 20μ*** optimization,using commercially available electronics,the prototype can achieved an energy resolution of 19.7%for a^(55)Fe X-ray *** CEE-MWDC detector and electronics were simultaneously *** energy resolution of 22%was achieved for the^(55)Fe source;the track residuals were approximately 330μm for the cosmic *** results demonstrate that the current design and techniques meet the requirements of the CEE-MWDC array.

关键词： CEE MWDC Garfield++ ^(55)Fe source Position resolution

Reconstruction of fission events in heavy ion reactions with the compact spectrometer for heavy ion experiment

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第4期33卷 1-9页

作者： Xin-Yue Diao Fen-Hai Guan Yi-Jie Wang Yu-Hao Qin Zhi Qin Dong Guo Qiang-Hua Wu Da-wei Si Xuan Zhao Sheng Xiao Yao-Peng Zhang xiang-lun wei Hai-Chuan Zou He-Run Yang Peng Ma Rong-Jiang Hu Li-Min Duan Artur Dobrowolski Krzysztof Pomorski Zhi-Gang Xiao Department of Physics Tsinghua UniversityBeijing 100084China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Institute of Physics Maria Curie Skłodowska UniversityLublin 20031Poland

We report a reconstruction method for fast-fission events in 25 MeV/u^(86)Kr +^(208)Pb reactions at the Compact Spectrometer for Heavy Ion Experiment(CSHINE). The fission fragments(FFs) are measured using three large-area parallel-plate avalanche counters, which can deliver the position and arrival timing information of the fragments. The start timing information is provided by the radio frequency of the cyclotron. Fission events were reconstructed using the velocities of the two FFs. The broadening of both the velocity distribution and azimuthal difference of the FFs decreases with the folding angle, in accordance with the picture that fast fission occurs. The anisotropic angular distribution of the fission axis also consistently reveals the dynamic features of fission events.

关键词： Fast fission Heavy ion reactions Parallelplate avalanche counter CSHINE

Experimental Study and a Modified Model for Temperature-Recovery Stress of Shape Memory Alloy Wire under Different Temperatures

在线全文

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2025年第2期19卷 347-364页

作者： Zhi-xiang wei Wen-wei Wang Yan-Jie Xue Wu-Tong ZhangQiu-Di Huang Guangxi Lepu Expressway Co. Ltd.Nanning530000China Department of Bridge Engineering School of TransportationSoutheast UniversityNanjing211189China Department of Road and Bridge Engineering College of Construction EngineeringJilin UniversityChangchun130012China

To investigate the performance of utilizing the shape memory effect of SMA(Shape Memory Alloy)wire to generate recovery stress,this paper performed single heating recovery stress tests and reciprocating heating-cooling recovery stress tests on SMA wire under varying initial strain *** effects of various strains and different energized heating methods on the recovery stress of SMA wires were explored in the single heating *** SMA wire was strained from 2%to 8%initially,and two distinct heating approaches were employed:one using a large current interval for rapid heating and one using a small current interval for slower *** experimental outcomes reveal that during a single heating cycle,the temperature-recovery stress relationship of SMA wire exhibits three distinct stages:the martensite phase stage,the transition stage from martensite to austenite phase,and the austenite phase ***,the choice of heating method does not influence the maximum recovery stress value,and the correlation between initial strain and maximum recovery stress is predominantly ***,conducting the reciprocating temperature rise and fall performance test is important to better simulate the scenario in practical engineering where multiple recovery stress in SMA wires for structural *** this test,two temperature cycling methods were studied:interval rise and fall,as well as direct rise and *** the case of utilizing the interval temperature rise and fall method,it was observed that the recovery stress associated with cooling was significantly higher than that corresponding to heating at the same ***,the recovery stress was lower upon subsequent heating than that measured during the previous heating *** on the experimental results,a prediction model for the temperature-recovery stress relationship has been proposed to simplify numerical *** is hoped that an approximate temperaturerecovery stress curve can be

关键词： SMA wire temperature recovery stress modified model phase transition

Achieving further refinement of grain structure and improvement of mechanical properties in Al-12Si-4Cu-2Ni-1Mg alloy by Al-Ti-C-B master alloy addition and deep cryogenic treatment

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Foundry 2025年第1期22卷 75-82页

作者： Lin-fei Xia Wen-bo Li Zuo-shan wei Yu-ying Wu xiang-fa Liu China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China Shandong Key Laboratory of Advanced Aluminum Materials and Technology Binzhou Institute of TechnologyBinzhou 256600ShandongChina

Near-eutectic Al-Si alloys are widely used in automotive manufacturing due to their superior wear resistance and high temperature *** of high Si content,the grain refinement of near-eutectic Al-Si alloy has been a problem for many *** this study,the effect of deep cryogenic treatment(DCT)on the microstructure and mechanical properties of Al-12Si-4Cu-2Ni-Mg alloy with addition of Al-Ti-C-B master alloy was fully *** show that the average grain size of the alloy is greatly reduced from 0.92 mm to 0.50 mm,and the eutectic Si and Al7Cu4Ni precipitates are spheroidized and refined in Al-12Si-4Cu-2Ni-Mg after DCT for 24 h and aging *** these changes of microstructures result in a significant increment of about 22.5%in elongation and a slight enhancement of about 6.8%in tensile ***,the refinement of microstructure also significantly improves the fatigue life of the alloy.

关键词： deep cryogenic treatment near-eutectic Al-Si master alloy microstructure mechanical properties

Quantum public-key crypto via EPR pairs

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 54-59页

作者： xiang-Qun Fu Hong-wei Li Jian-Hong Shi Tan Li Wan-Su Bao Henan Key Laboratory of Quantum Information and Cryptography Information Engineering UniversityZhengzhou 450004China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

With the development of quantum computing technology,quantum public-key cryptography is gradually becoming an alternative to the existing classical public-key *** paper designs a quantum trapdoor one-way function via EPR pairs and quantum *** on this,a new quantum public-key cryptosystem is presented,which offers forward security,and can resist the chosen-plaintext attack and chosen-ciphertext *** with the existing quantum public-key cryptos,eavesdropping can be automatically detected in this new quantum public-key cryptosystem under a necessary condition,which is also detailed in the paper.

关键词： quantum public-key crypto trapdoor one-way function EPR pairs

When Software Security Meets Large Language Models:A Survey

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2025年第2期12卷 317-334页

作者： Xiaogang Zhu wei Zhou Qing-Long Han Wanlun Ma Sheng Wen Yang xiang IEEE the School of Computer and Mathematical Sciences the University of Adelaide the School of Science Computing and Engineering Technologies Swinburne University of Technology

Software security poses substantial risks to our society because software has become part of our life. Numerous techniques have been proposed to resolve or mitigate the impact of software security issues. Among them, software testing and analysis are two of the critical methods, which significantly benefit from the advancements in deep learning technologies. Due to the successful use of deep learning in software security, recently,researchers have explored the potential of using large language models(LLMs) in this area. In this paper, we systematically review the results focusing on LLMs in software security. We analyze the topics of fuzzing, unit test, program repair, bug reproduction, data-driven bug detection, and bug triage. We deconstruct these techniques into several stages and analyze how LLMs can be used in the stages. We also discuss the future directions of using LLMs in software security, including the future directions for the existing use of LLMs and extensions from conventional deep learning research.

关键词： Large language models (LLMs) software analysis software security software testing

Constructing diverse switchable circularly polarized luminescence via a single azobenzene polymer film

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2025年第1期36卷 299-305页

作者： xiang Wang Qingping Song Zixiang He Gong Zhang Tengfei Miao Xiaoxiao Cheng wei Zhang State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Department of Polymer Science and EngineeringCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China School of Chemical and Environmental Engineering Anhui Polytechnic UniversityWuhu 241000China Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials School of Chemistry and Chemical EngineeringHuaiyin Normal UniversityHuaian 223300China

Recently circularly polarized luminescence(CPL)materials have attracted significant *** reversible dynamic property to these materials has been a key focus in cutting-edge fields,such as in high-level information ***,we provided a novel and general strategy involving handednessselective filtration and ground-state chiral self-recovery(CSR)in double film system to address this *** on this strategy,we achieved CPL switch through the reversible modulation of ground-state chirality including absorption and scattering circular dichroism(CD)signals over the full UV-visible wavelength range(365-700 nm)in a single azobenzene polymer(PAzo)*** importantly,by flexibly changing the type of fluorescent films,it is convenient to achieve general excited-state CSR,that is reversible switching of full-color including ideal white(CIE coordinate(0.33,0.33)),as well as room-temperature phosphorescent *** these CPL signals without almost any intensity decay after three cycles of onand-off *** results indicated that the trans-cis isomerization and ordered rearrangement of azobenzene units in PAzo film were the fundamental reasons for realizing CPL ***,based on this system we achieved dynamic visual encryption and decryption process including multiple decryption *** study provides an effective method for constructing a universally applicable chiroptical switch in excited state.

关键词： Circularly polarized luminescence Azobenzene polymer Multiple CPL Chiral switch Information encryption

The Security of Using Large Language Models:A Survey With Emphasis on ChatGPT

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2025年第1期12卷 1-26页

作者： wei Zhou Xiaogang Zhu Qing-Long Han Lin Li Xiao Chen Sheng Wen Yang xiang the School of Science Computing and Engineering Technologies Swinburne University of Technology IEEE the School of Computer and Mathematical Sciences the University of Adelaide Adelaide the Faculty of Science and Engineering Southern Cross University the School of Information and Physical Sciences the University of Newcastle

ChatGPT is a powerful artificial intelligence(AI)language model that has demonstrated significant improvements in various natural language processing(NLP) tasks. However, like any technology, it presents potential security risks that need to be carefully evaluated and addressed. In this survey, we provide an overview of the current state of research on security of using ChatGPT, with aspects of bias, disinformation, ethics, misuse,attacks and privacy. We review and discuss the literature on these topics and highlight open research questions and future *** this survey, we aim to contribute to the academic discourse on AI security, enriching the understanding of potential risks and mitigations. We anticipate that this survey will be valuable for various stakeholders involved in AI development and usage, including AI researchers, developers, policy makers, and end-users.

关键词： Artificial intelligence (AI) ChatGPT large language models (LLMs) security