检索结果-南通市图书馆

Precise Determination of the Bottom-Quark On-Shell Mass Using Its Four-Loop Relation to the■-Scheme Running Mass

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2024年第10期41卷 26-30页

作者： Shun-Yue Ma Xu-Dong Huang Xu-Chang Zheng Xing-Gang Wu department of physics Chongqing Key Laboratory for Strongly Coupled PhysicsChongqing UniversityChongqing 401331China College of physics and Electronic engineering Chongqing Normal UniversityChongqing 401331China

We explore the properties of the bottom-quark on-shell mass(Mb)by using its relation to the■mass■.At present,this■-on-shell relation has been known up to four-loop QCD corrections,which however still has a~2%scale ... 详细信息

关键词： correction quark relation

Multiplicity dependence of the freezeout parameters in high energy hadron-hadron collisions

在线全文

学校读者我要写书评

暂无评论

Chinese physics C 2024年第5期48卷 124-133页

作者： Muhammad Ajaz Majid Shehzad Muhammad Waqas Haifa I.Alrebdi Mohammad Ayaz Ahmad Antalov Jagnandan Shawn Jagnandan Murad Badshah Jalal Hasan Baker Abdul Mosawir Quraishi department of physics Abdul Wali Khan University MardanMardan 23200Pakistan School of Mathematics Physics and Optoelectronic EngineeringHubei University of Automotive TechnologyShiyan 442002China department of physics College of SciencePrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh 11671Saudi Arabia department of Mathematics Physics and StatisticsFaculty of Natural SciencesUniversity of Guyana101110 GeorgetownGuyananSouth America department of physics Faculty of ScienceUniversity of TabukTabukKingdom of Saudi Arabia department of Electrical engineering College of EngineeringQassim UniversityUnaizahSaudi Arabia

We examined the transverse momentum(pT)spectra of various identified particles,encompassing both light-flavored and strange hadrons(π++π−,K++K−,p+p¯,ϕ,K0s,Λ+Λ¯,Ξ−+Ξ¯+,andΩ−+Ω¯+),across different multiplicity classes in proton-proton collisions(p-p)at a center-of-mass energy of s√=7 *** the Tsallis and Hagedorn models,parameters relevant to the bulk properties of nuclear matter were *** models exhibit good agreement with experimental *** our analyses,we observed a consistent decrease in the effective temperature(T)for the Tsallis model and the kinetic or thermal freeze-out temperature(T0)for the Hagedorn model,as we transitioned from higher multiplicity(class-I)to lower multiplicity(class-X).This trend is attributed to the diminished energy transfer in higher multiplicity ***,we observed that the transverse flow velocity(βT)experiences a decline from class-I to *** normalization constant,which represents the multiplicity of produced particles,was observed to decrease as we moved toward higher multiplicity *** the effective and kinetic freeze-out temperatures,as well as the transverse flow velocity,show a mild dependency on multiplicity for lighter particles,this dependency becomes more pronounced for heavier *** multiplicity parameter for heavier particles was observed to be smaller than that of lighter particles,indicating a greater abundance of lighter hadrons compared to heavier *** particle species were observed to undergo decoupling from the fireball at distinct temperatures:lighter particles exhibit lower temperatures,while heavier ones show higher temperatures,thereby supporting the concept of multiple freeze-out ***,we identified a positive correlation between the kinetic freeze-out temperature and transverse flow velocity,a scenario where particles experience stronger collective motion at a higher freeze-out *** reason for this positive correlation is th

关键词： multiplicity dependence collective properties thermal energy

Three-Wave Mixing of Dipole Solitons in One-Dimensional Quasi-Phase-Matched Nonlinear Crystals

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2024年第1期41卷 25-33页

作者：郭宇欣徐晓喜陈招拼周延桂刘彬和河向黎永耀谢嘉宁 School of physics and Optoelectronic engineering Foshan UniversityFoshan 528000China physics department and Solid-State Institute TechnionHaifa 32000Israel Guangdong-Hong Kong-Macao Joint Laboratory for Intelligent Micro-Nano Optoelectronic Technology School of Physics and Optoelectronic EngineeringFoshan UniversityFoshan 528000China

A quasi-phase-matched technique is introduced for soliton transmission in a quadratic[χ^((2))]nonlinear crystal to realize the stable transmission of dipole solitons in a one-dimensional space under three-wave *** report four types of solitons as dipole solitons with distances between their bimodal peaks that can be laid out in different *** study three cases of these solitons:spaced three stripes apart,one stripe apart,and confined to the same *** the case of three stripes apart,all four types have stable results,but for the case of one stripe apart,stable solutions can only be found atω_(1)=ω_(2),and for the condition of dipole solitons confined to one stripe,stable solutions exist only for Type1 and Type3 atω_(1)=ω_(2).The stability of the soliton solution is solved and verified using the imaginary time propagation method and real-time transfer propagation,and soliton solutions are shown to exist in the multistability *** addition,the relations of the transportation characteristics of the dipole soliton and the modulation parameters are numerically ***,possible approaches for the experimental realization of the solitons are outlined.

关键词： soliton solitons dipole

Long Term X-Ray Spectral Variations of the Seyfert-1 Galaxy Mrk 279

在线全文

学校读者我要写书评

暂无评论

Research in astronomy and Astrophysics 2024年第6期24卷 307-314页

作者： K.Akhila Ranjeev Misra Savithri H.Ezhikode K.Jeena department of physics Providence Women’s CollegeUniversity of CalicutKerala 673009India Inter-University Centre for astronomy and Astrophysics(IUCAA) PB No.4GaneshkhindPune 411007India department of physics and Electronics CHRIST(Deemed to be University)Hosur Main RoadBangalore 560029India

We present the results from a long term X-ray analysis of Mrk 279 during the period 2018–*** use data from multiple missions–AstroSat,NuSTAR and XMM-Newton,for the *** X-ray spectrum can be modeled as a double Comptonization along with the presence of neutral Fe Kαline emission,at all *** determined the source’s X-ray flux and luminosity at these different *** find significant variations in the source’s flux *** also investigate the variations in the source’s spectral components during the observation *** find that the photon index and hence the spectral shape follow the variations only over longer time *** probe the correlations between fluxes of different bands and their photon indices,and found no significant correlations between the parameters.

关键词： galaxies:Seyfert galaxies:individual(Mrk 335) X-rays:galaxies

Life under tension: the relevance of force on biological polymers

在线全文

学校读者我要写书评

暂无评论

Biophysics Reports 2024年第1期10卷 48-56页

作者： Matthew T.J.Halma Longfu Xu department of physics and astronomy and Laser Lab Vrije Universiteit Amsterdam LUMICKS B.V.

Optical tweezers have elucidated numerous biological processes, particularly by enabling the precise manipulation and measurement of tension. One question concerns the biological relevance of these experiments and the generalizability of these experiments to wider biological systems. Here, we categorize the applicability of the information garnered from optical tweezers in two distinct categories: the direct relevance of tension in biological systems, and what experiments under tension can tell us about biological systems, while these systems do not reach the same tension as the experiment, still, these artificial experimental systems reveal insights into the operations of biological machines and life processes.

关键词： Tension Optical tweezers Molecular force

Pedestrian lane formation with following–overtaking model and measurement of system order

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 physics B 2024年第2期33卷 247-263页

作者：李碧璐李政周睿申世飞 department of engineering physics Tsinghua UniversityBeijing 100084China School of Safety Science Tsinghua UniversityBeijing 100084China

Pedestrian self-organizing movement plays a significant role in evacuation studies and architectural *** formation,a typical self-organizing phenomenon,helps pedestrian system to become more orderly,the majority of following behavior model and overtaking behavior model are imprecise and unrealistic compared with pedestrian movement in the real *** this study,a pedestrian dynamic model considering detailed modelling of the following behavior and overtaking behavior is constructed,and a method of measuring the lane formation and pedestrian system order based on information entropy is *** and analysis demonstrate that the following and avoidance behaviors are important factors of lane formation.A high tendency of following results in good lane *** non-selective following behavior and aggressive overtaking behavior cause the system order to *** most orderly following strategy for a pedestrian is to overtake the former pedestrian whose speed is lower than approximately 70%of his *** influence of the obstacle layout on pedestrian lane and egress efficiency is also studied with this *** presence of a small obstacle does not obstruct the walking of pedestrians;in contrast,it may help to improve the egress efficiency by guiding the pedestrian flow and mitigating the reduction of pedestrian system orderliness.

关键词： pedestrian movement lane formation information entropy order degree

Anisotropic s-Wave Gap in the Vicinity of a Quantum Critical Point in Superconducting BaFe_(2)(As_(1-x)P_(x))_(2) Single Crystals:A Study of Point-Contact Spectroscopy

在线全文

学校读者我要写书评

暂无评论

Chinese physics Letters 2024年第4期41卷 118-123页

作者：詹红星林玉尺赵宇清左海艳王兴玉马肖燕李春红罗会仟陈根富李世亮任聪 School of physics and astronomy Yunnan UniversityKunming 650500China Beijing National Laboratory for Condensed Matter physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China Yunnan Key Laboratory for Electromagnetic Materials and Devices Yunnan UniversityKunming 650500China

We report on soft c-axis point-contact Andreev reflection(PCAR)spectroscopy combining with resistivity measurements on BaFe_(2)(As_(0.7)P_(0.3))_(2),to elucidate the superconducting gap structure in the vicinity of the quantum critical point.A double peak at the gap edge plus a dip feature at zero-bias has been observed on the PCAR spectra,indicative of the presence of a nodeless gap in BaFe_(2)(As_(0.7)P_(0.3))_(2).Detailed analysis within a sophisticated theoretical model reveals an anisotropic gap with deep gap *** PCARs also feature additional structures related to the electron-bosonic coupling *** the extracted superconducting energy gap value,a characteristic bosonic energy Ω_(b) and its temperature dependence are obtained,comparable with the spin-resonance energy observed in neutron scattering *** results indicate a magnetism-driven quantum critical point in the BaFe_(2)(As_(1-x)P_(x))_(2) system.

关键词： quantum critical resistivity

Forecasting supernova observations with the CSST:*** samples

在线全文

学校读者我要写书评

暂无评论

Science China(physics,Mechanics & astronomy) 2024年第11期67卷 164-177页

作者： Chengqi Liu Youhua Xu Xianmin Meng Xin Zhang Shi-Yu Li Yuming Fu Xiaofeng Wang Shufei Liu Zun Luo Guanghuan Wang Hu Zhan department of astronomy School of PhysicsPeking UniversityBeijing 100871China Kavli Institute for astronomy and Astrophysics Peking UniversityBeijing 100871China Key Laboratory of Space astronomy and Technology National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China Beijing Planetarium Beijing Academy of Science and TechnologyBeijing 100044China Leiden Observatory Leiden UniversityNL-2300 RA LeidenThe Netherlands Kapteyn Astronomical Institute University of GroningenNL-9700 AV GroningenThe Netherlands physics department Tsinghua UniversityBeijing 100084China School of astronomy and Space Science University of ChineseAcademy of SciencesBeijing 100049China

The China Space Station Telescope(CSST,also known as Xuntian)is a serviceable two-meter-aperture wide-field telescope operating in the same orbit as the China Space *** CSST plans to survey a sky area of 17,500 deg^(2)of the medium-to-high Galactic latitude to a depth of 25-26 AB mag in at least 6 photometric bands over 255-1,000 *** such a large sky area,slitless spectra will also be taken over the same wavelength range as the imaging *** though the CSST survey is not dedicated to time-domain studies,it would still detect a large number of transients,such as supernovae(SNe).In this paper,we simulate photometric SN observations based on a strawman survey plan using the Sncosmo *** its 10-year survey,the CSST is expected to observe about 5 million SNe of various *** quality cuts,we obtain a“gold”sample that comprises roughly 7,400 SNe Ia,2,200 SNe Ibc,and 6,500 SNeⅡcandidates with correctly classified percentages reaching 91%,63%,and 93%(formally defined as classification precision),*** same survey can also trigger alerts for the detection of about 15,500 SNe Ia(precision 61%)and 2,100 SNeⅡ(precision 49%)candidates at least two days before the light ***,the near-ultraviolet observations of the CSST will be able to catch hundreds of shock-cooling events serendipitously every *** results demonstrate that the CSST can make a potentially significant contribution to SN studies.

关键词： space-based ultraviolet optical and infrared telescopes supernovae data analysis

New Strategy for Boosting Cathodic Performance of Protonic Ceramic Fuel Cells Through Incorporating a Superior Hydronation Second Phase

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第4期7卷 83-92页

作者： Chuan Zhou Xixi Wang Dongliang Liu Meijuan Fei Jie Dai Daqin Guan Zhiwei Hu Linjuan Zhang Yu Wang Wei Wang Ryan O'Hayre San Ping Jiang Wei Zhou Meilin Liu Zongping Shao State Key Laboratory of Materials-Oriented Chemical engineering College of Chemical Engineering Nanjing Tech University Max Planck Institute for Chemical physics of Solids Key Laboratory of Interfacial physics and Technology Shanghai Institute of Applied Physics Chinese Academy of Sciences department of Metallurgical and Materials engineering Colorado School of Mines WA School of Mines: Minerals Energy and Chemical Engineering (WASM-MECE) Curtin University Suzhou Laboratory School of Materials Science and engineering Georgia Institute of Technology

For protonic ceramic fuel cells,it is key to develop material with high intrinsic activity for oxygen activation and bulk proton conductivity enabling water formation at entire electrode ***,a higher water content which benefitting for the increasing proton conductivity will not only dilute the oxygen in the gas,but also suppress the O2adsorption on the electrode surface.

关键词： cathode high-hydrating capability proton conductivity protonic ceramic fuel cells