检索结果-南通市图书馆

Frontiers of physics 2022年第4期17卷 185-193页

作者： Peng-Hong Lu Xiao-fei zhang Chao-Qing Dai College of Optical Mechanical and Electrical EngineeringZhejiang A&F UniversityLin’an 311300China Department of Physics Shaanxi University of Science and TechnologyXi’an 710021China

We consider the dynamics and formation of vortices from ring dark solitons in a two-dimensional Bose–Einstein condensate with the Rashba spin–orbit coupling based on the time-dependent coupled Gross–Pitaevskii *** with previous results,the system exhibits complex dynamical behaviors in the presence of the spin–orbit *** the modulation of the spin–orbit coupling,not only the lifetime of ring dark solitons is greatly prolonged,but also their attenuation kinetics is significantly *** two shallow ring dark solitons with the equal strength of the spin–orbit coupling,the radius of ring dark solitons increases to a maximum value over time and then shrinks into a minimum *** to the effect of the snake instability,ring dark solitons split into a series of ring-like clusters of vortex pairs,which perform complex *** indicates that the system is strongly dependent on the presence of the spin–orbit ***,the effect of different initial modulation depths on the dynamics of ring dark solitons is investigated.

关键词： Bose–Einstein condensate Rashba spin–orbit coupling ring dark solitons vortex pairs

Proton radioactivity within the generalized liquid drop model with various versions of proximity potentials

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2021年第6期73卷 102-109页

作者： Yu-Qi Xin Jun-Gang Deng Hong-fei zhang School of Nuclear Science and Technology Lanzhou University730000 LanzhouChina

In the present work,we systematically investigate the proton radioactivity half-lives of spherical proton emitters adopting a generalized liquid drop model(GLDM)with 16 different proximity potentials,of which the proximity potential Prox.77-13 gives the closest results to the experimental *** with the previous conclusion that the GLDM with proximity potential Prox.77-13 can also best describeαdecay half-lives,which makes the model more uniform and ***,we use the proximity potential Prox.77-13 in GLDM to predict the proton radioactivity half-lives of 14 spherical proton emitters that are allowed energetically but not yet observed experimentally or specifically ***,we research the Geiger-Nuttall law for proton *** results reveal that the Geiger-Nuttall law can also be well used to study the proton radioactivity half-lives of isotopes with the same orbital angular momentum l.

关键词： spherical proton emitter GLDM proximity energy Geiger-Nuttall law

Detection of Gamma-Rays from the Protostellar Jet in the HH 80–81 System

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2022年第2期22卷 183-188页

作者： Da-Hai Yan Jia-Neng Zhou Peng-fei zhang Key Laboratory for the Structure and Evolution of Celestial Objects Yunnan ObservatoriesChinese Academy of SciencesKunming 650011China Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Department of Astronomy Key Laboratory of Astroparticle Physics of Yunnan ProvinceYunnan UniversityKunming 650091China

Considering that the existence of relativistic particles in the protostellar jet has been confirmed by the detection of linearly polarized radio emission from the HH 80–81 jet,we search for gamma-rays from the HH 80–81 system using ten-year Fermi-LAT observations.A significant point-likeγ-ray excess is found in the direction of the HH80–81 system with the Test-Statistic value>100,which is likely produced in the HH 80–81 ***γ-ray spectrum extends only to 1 Ge V with a photon index of *** significant variability is found in the gamma-ray *** is discussed that the properties of HH 80–81 jet suffice for producing the observedγ-rays.

关键词： gamma-rays:ISM-ISM:jets and outflows radiation mechanisms:non-thermal stars:protostars

Global trends and hotspots of treatment for nonalcoholic fatty liver disease:A bibliometric and visualization analysis(2010-2023)

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2023年第37期29卷 5339-5360页

作者： Jin-Jin Dai Ya-fei zhang Zhen-Hua zhang Department of Infectious Diseases Suzhou Hospital of Anhui Medical UniversitySuzhou 234000Anhui ProvinceChina Department of Infectious Diseases The Second Affiliated Hospital of Anhui Medical UniversityHefei 230601Anhui ProvinceChina

BACKGROUND Nonalcoholic fatty liver disease(NAFLD)is chronic,with its progression leading to liver fibrosis and end-stage *** NAFLD is increasingly common,no treatment guideline has been *** mechanistic studies and drug trials have been conducted for new drug development to treat *** up-to-date overview on the knowledge structure of NAFLD through bibliometrics,focusing on research hotspots,is necessary to reveal the rational and timely directions of development in this *** To research the latest literature and determine the current trends in treatment for *** Publications related to treatment for NAFLD were searched on the Web of Science Core Collection database,from 2010 to ***,CiteSpace,and R package“bibliometrix”were used to conduct this bibliometric *** key information was extracted,and the results of the cluster analysis were based on network data for generating and investigating maps for country,institution,journal,and *** analysis,bursts and cluster analysis,cooccurrence analysis,and trend topic revealed the knowledge structure and research hotspots in this *** Prism 9.***.1.733 and Microsoft Office Excel 2019 were used for data analysis and *** In total,10829 articles from 120 countries(led by China and the United States)and 8785 institutions were *** number of publications related to treatment for NAFLD increased *** China produced the most publications,the United States was the most cited country,and the United Kingdom collaborated the most from an international *** University of California-San Diego,Shanghai Jiao Tong University,and Shanghai University of Traditional Chinese Medicine produced the most publications of all the research *** International Journal of Molecular Sciences was the most frequent journal out of the 1523 total journals,and Hepatology was the most cited and co-cited ***

关键词： Bibliometrics Treatment Therapy Nonalcoholic fatty liver disease Metabolic dysfunction-associated fatty liver disease Historiography analysis

Non-extensive statistical distributions of charmed meson production in Pb-Pb and pp(p)collisions

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

Nuclear Science and Techniques 2021年第10期32卷 79-87页

作者： Yuan Su Yong-Jie Sun Yi-fei zhang Xiao-Long Chen State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China

The mid-rapidity transverse momentum spectra of charmed mesons in Pb–Pb and pp(p)collisions are analyzed using the Tsallis–Pareto distribution derived from non-extensive *** provide uniform descriptions of both small and large systems over a wide range of collision energies and hadron transverse *** establishing the relationship between the event multiplicity and Tsallis parameters,we observe that there is a signifi-cant linear relationship between the thermal temperature and Tsallis q parameter in Pb–Pb collisions at √sNN=2.76 TeV and 5.02 ***,the slope of the T–(q-1)parameter plot is positively correlated with the hadron *** addition,charmed mesons have a higher thermal temperature than light hadrons at the same q-1,indicat-ing that the charm flavor requires a higher temperature to reach the same degree of non-extensivity as light flavors in heavy-ion *** same fit is applied to the trans-verse momentum spectra of charmed mesons in pp(p)collisions over a large energy range using the Tsallis–Pareto *** is found that the thermal temperature increases with system energy,whereas the q parameter becomes saturated at the pp(p)limit,q-1=0.142±*** addition,the results of most peripheral Pb–Pb collisions are found to approach the pp(p)limit,which suggests that more peripheral heavy-ion collisions are less affected by the medium and more similar to pp(p)collisions.

关键词： Charmed meson Non-extensive statistics Tsallis-Pareto distribution QGP Heavy-ion collision

Probing the sign-changeable interaction between dark energy and dark matter with current observations

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2018年第3期61卷 1-9页

作者： Juan-Juan Guo Jing-fei zhang Yun-He Li Dong-Ze He Xin zhang Department of Physics College of Sciences Northeastern University Center for High Energy Physics Peking University

We consider the models of vacuum energy interacting with cold dark matter in this study, in which the coupling can change sigh during the cosmological evolution. We parameterize the running coupling b by the form b（a） = boa ＋ be（1 - a）, where at the earlytime the coupling is given by a constant be and today the coupling is described by another constant bo. We explore six specific models with （i） Q = b（a）Hoρo, （ii） Q = b（a）Hoρde, （iii） Q = b（a）Hoρc, （iv） Q = b（a）Hρo, （v） Q = b（a）Hρde, and （vi） Q = b（a）Hρc. The current observational data sets we use to constrain the models include the JLA compilation of type Ia supernova data, the Planck 2015 distance priors data of cosmic microwave background observation, the baryon acoustic oscillations measurements and the Hubble constant direct measurement. We find that, for all the models, we have b0 〈 0 and be 〉 0 at around the lolevel, and b0 and be are in extremely strong anti-correlation. Our results show that the coupling changes sign during the evolution at about the lolevel, i.e., the energy transfer is from dark matter to dark energy when dark matter dominates the universe and the energy transfer is from dark energy to dark matter when dark energy dominates the universe.

关键词： interacting dark energy sign-changeable interaction running coupling observational constraints

Determination of the solubility parameter of cellulose acrylate using inverse gas chromatography

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2007年第22期52卷 3051-3055页

作者： ZHAO Shu zhang fei zhang WenWen SHI BaoLi Heilongjiang Key Laboratory of Molecule Design and Preparation of Flame Retardant Materials Northeast Forestry University Harbin 150040 China

The solubility parameters of cellulose acrylate substituted degree 2.12(CEA) have been calculated from the measured retention data by inverse gas chromatography at various temperatures. The weight frac-tion activity coefficients of the solvents at infinite dilution(Ω1∞),the Flory-Huggins thermodynamic in-teraction parameters between CEA and solvents(χ 1∞2),the excess molar heats of mixing(△H1s),the par-tial molar heats of mixing at infinite dilution(△H1∞),the solubility parameters of solvent(δ1),and the solubility parameters of CEA(δ2),were calculated at various temperatures. The δ2 of the CEA was 17.32,18.00,18.13,18.54,19.39 at 55,60,65,70 and 75℃,respectively.

关键词：溶解参数纤维素丙烯酸盐套色版

Effects of shell correction on α decay properties

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2018年第9期42卷 87-95页

作者： Jing zhang De-Jun E Hong-fei zhang School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China Joint Department for Nuclear Physics Lanzhou University and Institute of Modern Physics CASLanzhou 730000China

The shell correction effects on the α decay properties of heavy and superheavy nuclei have been studied in a macroscopic-microscopic manner. The macroscopic part is constructed from the generalized liquid drop model（GLDM）, whereas the microscopic part, namely, the shell correction energy, brings about certain effects on the potential barriers and half-lives under a WKB approximation, which is emphasized in this work. The results show that the shell effects play a significant role in the estimation of the α decay half-lives within the actinide *** of the α decay half-lives are then generated for superheavy nuclei, which will provide useful information for future experiments.

关键词： shell correction α decay generalized liquid drop model

Research on Pitch Control Strategies of Horizontal Axis Tidal Current Turbine

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2020年第2期34卷 223-231页

作者： WANG Bing-zhen HU Teng-yan GUO Yi zhang Yuan-fei National Ocean Technology Center Tianjin 300112China

Based on blade element momentum theory and generator characteristic test,a dynamic simulation model of 150 kW horizontal-axis tidal current turbine was *** matching of the dynamic characteristics between the turbine and generator under various current velocities is studied,and the influence of the pitch angle on the matching is *** the problem of maximum power output in case of low current speed and limiting power in high current speed,the relation between optimal pitch angle and output power is *** the basis of dynamic characteristic analysis,the variable pitch control strategy is *** performance of the turbine under various tidal conditions is *** research results show that the designed controller enables the turbine to operate efficiently under the condition of low current speed,and achieve the goal of limited power at high current speed.

关键词： tidal energy horizontal axis tidal current turbine(HATT) pitch control simulation

Preparation of MnO2-impregnated carbon-coated Fe3O4 nanocomposites and their application for bovine serum albumin adsorption

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2020年第10期39卷 1151-1158页

作者： Chol-Hwan Kim Ze-fei zhang Lin-Shan Wang Ting Sun College of Sciences Northeastern UniversityShenyang 110004China

MnO2-impregnated carbon-coated Fe3 O4(Fe3O4/C/MnO2)nanocomposites with a good core-shell structure were prepared by direct oxidation of carbon-coated Fe3 O4(Fe3O4/C)microspheres with KMnO4 in alkaline solution and applied to adsorb bovine serum albumin(BSA).X-ray diffraction(XRD),transmission electron microscope(TEM),Fourier transform infrared spectrometer(FTIR),vibrating sample magnetometer(VSM)and thermogravimetric analyzer(TGA)tests show that Fe3O4/C microspheres were newly functionalized via the oxidation by ***3O4/C/MnO2 nanocomposites exhibit a higher adsorption capacity for BSA than Fe3O4/C microspheres and the maximum adsorption of BSA on them occurs at pH 4.7,which is the isoelectric point of *** isotherm model describes the adsorption of BSA better than Freundlich model and Temkin model,and the kinetics data fit well with the pseudo-second-order model.

关键词： Fe3O4/C/MnO2 nanocomposites Bovine serum albumin Adsorption