检索结果-南通市图书馆

维普期刊数据库博看期刊

Density fluctuations in intermediate-energy heavy-ion collisions

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2022年第5期33卷 1-7页

作者： Cong Liu Xian-Gai Deng Yu-gang Ma Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Shanghai Research Center for Theoretical Nuclear Physics NSFC and Fudan UniversityShanghai 200438China

Within the framework of the isospin-dependent quantum molecular dynamics model,we simulate^(129)Xe+^(119)Sn collisions in an incident energy range of 20 to 190MeV/nucleon and discuss the liquid-gas phase transition with density *** comparison,we also extract the effective Fisher parameter τ_(eff),multiplicity of intermediate-mass fragments(IMFs),and information *** is found that the Fisher parameter and maximum information entropy of collisions have peak values at E_(beam)=50-80 MeV/*** addition,the maximum multiplicity of IMFs has a plateau around 70 MeV/*** higher-order density moments in a larger central region of[-5,5]^(3) fm^(3) in the collision system,a maximum plateau also appears as function of beam energy at energies exceeding 70 MeV/*** observables,which are consistent with each other,indicate a liquid-gas phase transition around 70 MeV/nucleon for the^(129)Xe+^(119)Sn system.

关键词： Heavy-ioncollisions Liquid-gasphase transition IQMD Density moment Intermediatemass fragment Informationentropy Fisher-lawparameter

Near-field surface displacement and permanent deformation induced by the Alaska Mw 7.5 earthquake determined by high-rate real-time ambiguity-fixed PPP solutions

在线全文

学校读者我要写书评

暂无评论

Chinese Science bulletin 2014年第34期59卷 4781-4789页

作者： gang Chen Qile Zhao Faculty of Information Engineering Department of Surveying Engineering China University of Geosciences Geophysical Institute University of Alaska FairbanksFairbanks AK 99775-7320 USA GNSS Research Center Wuhan University

High-rate GPS data from the United States continuously operating reference stations in the Alaska region are processed using the recently developed precise point positioning(PPP) technique. The traditional PPP technique does not fix ambiguities into their integers because these ambiguities do not have an integer nature when data from a single receiver, as well as precise orbit and clock corrections, are used. Additional corrections, i.e.,uncalibrated phase delay(UPD), are needed to fix integer ambiguities and consequently improve positioning accuracy. This study proposes a methodology to compute for wide-lane and L2(the second L-band frequency) UPDs using the geometry-based model and subsequently applies these parameters to the computation for ambiguity-fixed solutions. The instantaneous displacements of near-field sites, as well as the permanent deformations after the earthquake, are therefore obtained for the January 5, 2013,Alaska earthquake. The real-time performance of PPP solutions are assessed by considering realistic data latency and data interval of corrections. Ambiguity-fixed solutions are compared with ambiguity-float ones. The comparison shows that the positioning accuracy can be improved significantly when the ambiguities are fixed correctly. Thesolutions using the real-time corrections are also compared with those using post-processing corrections, i.e., Center for Orbit Determination in Europe final orbit and *** the accuracy is somehow degraded because of the data latency and data interval, the real-time results are satisfactory for use in monitoring the small-scale deformation(1–2 cm) caused by the Alaska earthquake. In addition, the kinematic ambiguity-fixed PPP solutions for7 days around the earthquake are calculated to obtain permanent pre- and post-earthquake deformations. The deformations computed from real-time and post-processing corrections do not appear to be significantly different.

关键词：整数模糊度永久变形阿拉斯加实时性能地表位移 PPP 地震后近场

b_(111),b_(112),_(b113),and b_(114):The most stable core-shell borospherenes with an icosahedral b_(12) core at the center exhibiting superatomic behaviors

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第12期14卷 4719-4724页

作者： Min Zhang Hai-gang Lu Si-Dian Li Institute of Molecular Science Shanxi UniversityTaiyuan030006China

boron allotropes are known to be predominately constructed by icosahedral b_(12) cages,while icosahedral-b_(12) stuffing proves to effectively improve the stability of fullerene-like boron nanoclusters in the size range between b_(98)–b_(102).However,the thermodynamically most stable core-shell borospherenes with a b_(12) icosahedron at the center still remains *** on the structural motif of D5h C_(70) and extensive first-principles theory calculations,we predict herein the high-symmetry C5v b111+(3)which satisfies the Wade’s n+1 and n+2 skeletal electron counting rules exactly and the approximately electron sufficient Cs b_(111)(4),Cs b_(112)(5),Cs b_(113)(6),and Cs b_(114)(7)which are the most stable neutral core-shell borospherenes with a b_(12) icosahedron at the center reported to date in the size range between b_(68)–b_(130),with Cs b112(5)being the thermodynamically most favorite species in the *** orbital and bonding analyses indicate that these spherically aromatic species all contain a negatively charged icosahedral b_(122)−core at the center which exhibits typical superatomic behaviors in the electronic configuration of 1S21P61D101F8,with its dangling valences saturated by twelve radial b-b 2c-2eσbonds between the b_(12) inner core and the b_(70) outer *** infrared(IR)and Raman spectra of the concerned species are computationally simulated to facilitate their future characterizations.

关键词： first-principles theory borospherenes structures bonding superatomic behaviors spherical aromaticity

Pythagorean probabilistic hesitant triangular fuzzy aggregation operators with applications in multiple attribute decision making

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

Journal of Systems Engineering and Electronics 2023年第2期34卷 422-438页

作者： LIAO Fuping LI Wu LIU gang ZHOU Xiaoqiang School of Information Science and Engineering Hunan Institute of Science and TechnologyYueyang 414006China

As a generalization of fuzzy set,hesitant probabilistic fuzzy set and pythagorean triangular fuzzy set have their own unique advantages in describing decision *** modern socioeconomic decision-making problems are becoming more and more complex,it also becomes more and more difficult to appropriately depict decision makers’cognitive information in decision-making *** order to describe the decision information more comprehensively,we define a pythagorean probabilistic hesitant triangular fuzzy set(PPHTFS)by combining the pythagorean triangular fuzzy set and the probabilistic hesitant fuzzy ***,the basic operation and scoring function of the pythagorean probabilistic hesitant triangular fuzzy element(PPHTFE)are proposed,and the comparison rule of two PPHTFEs is ***,some pythagorean probabilistic hesitant triangular fuzzy aggregation operators are developed,and their properties are also ***,a multi-attribute decision-making(MADM)model is constructed based on the proposed operators under the pythagorean probabilistic hesitant triangular fuzzy information,and an illustration example is given to demonstrate the practicability and validity of the proposed decision-making method.

关键词： pythagorean probabilistic hesitant triangular fuzzy set(PPHTFS) aggregation operator multi-attribute decisionmaking(MADM)

Method for triangular fuzzy multiple attribute decision making based on two-dimensional density operator method

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2024年第1期35卷 178-185页

作者： LIN Youliang LI Wu LIU gang HUANG Dong School of Economics and Management Hunan Institute of Science and TechnologyYueyang 414000China Hunan Vocational College for Nationalities Yueyang 414000China School of Information Science and Engineering Hunan Institute of Science and TechnologyYueyang 414000China

Aiming at the triangular fuzzy(TF)multi-attribute decision making(MADM)problem with a preference for the distribution density of attribute(DDA),a decision making method with TF number two-dimensional density(TFTD)operator is proposed based on the density operator theory for the decision maker(DM).Firstly,a simple TF vector clustering method is proposed,which considers the feature of TF number and the geometric distance of ***,the least deviation sum of squares method is used in the program model to obtain the density weight ***,two TFTD operators are defined,and the MADM method based on the TFTD operator is ***,a numerical example is given to illustrate the superiority of this method,which can not only solve the TF MADM problem with a preference for the DDA but also help the DM make an overall comparison.

关键词： fuzzy decision making clustering density operator multi-attribute decision making(MADM)

Adaptive fuzzy terminal sliding mode control for the free-floating space manipulator with free-swinging joint failure

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2021年第9期34卷 178-198页

作者： Qingxuan JIA bonan YUAN gang CHEN Yingzhuo FU School of Automation Beijing University of Posts and TelecommunicationsBeijing 100876China

Space manipulator with free-swinging joint failure simultaneously contains kinematic and dynamic coupling relationships,so it belongs to a new underactuated *** allow the manipulator to carry on tasks,an effective robust underactuated control method for the space manipulator with free-swinging joint failure is studied in this *** the effect of model uncertainty and joint torque disturbance,a robust underactuated control system based on the Terminal Sliding Mode Controller(TSMC)is designed,but two drawbacks are discussed:(A)Robustness depraves with eliminating chattering.(b)Control parameters are difficult to be determined under unknown uncertainty and *** improve the TSMC,the adaptive fuzzy controller is introduced to estimate the real effect of unknown uncertainty and disturbance according to deviations of sliding mode and its reaching *** estimated result is directly compensated into active joints *** simulation,the space manipulator with free-swinging joint executes tasks based on the TSMC and the Adaptive Fuzzy Terminal Sliding Mode Controller(AFTSMC)*** tasks can be finished with smaller joints torque and stronger robustness based on the ***,AFTSMC can serve as an effective robust control method for the space manipulator with free-swinging joint failure under unknown model uncertainty and torque disturbance.

关键词： Space manipulator Free-swinging joint failure Sliding mode control Adaptive fuzzy control Robust controllers

Progress on the glassy-crystal laminates:From design,microstructure to deformation and future solutions

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第5期172卷 113-144页

作者： Yu Chen Ronggao Cui Jun Shen gang Wang College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Department of Motor Design business Weichai New Energy Technology Co.Ltd.Weifang 261061China Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robots Shenzhen UniversityShenzhen 518060China Laboratory for Microstructures Institute of MaterialsShanghai UniversityShanghai 200444China

The development of new design strategies to create innovative structural materials,refine existing ones,and achieves compatible combinations of strength and plasticity remains a worldwide *** alloys,such as shape memory alloys(SMAs),bulk metallic glasses(bMGs),high entropy alloys(HEAs),and heterogeneous pure metals such as Cu,have excellent mechanical responses,but they still fall short of meeting all the requirements of structural materials due to specific flaws,such as lack of tensile de-formation for bMGs and low yielding strength for *** address these shortcomings,proposals such as integrating glassy matrices and crystallized alloys,such as HEAs/SMAs,have been ***,these solutions have unresolved issues,such as the challenging control of b2 phase formation in bMG ***,glass-crystal(A/C)laminated alloys with alternating layers have been reported to exhibit improved mechanical properties and activated work-hardening behaviors,but they still face press-ing issues such as bonding interfaces and unknown deformation *** review focuses on design routes such as the selection of alloy components and processing techniques,exploration of micro-structural evolution and deformation modes with an increase in strain,and future solutions to address pressing and unsolved *** prominent advantages include diversified deformation mechanisms,such as deformation twinning,martensitic phase transformation,and precipitation hardening,as well as tuned interactive reactions of shear bands(Sbs)near the A/C ***,this review provides a promising pathway to design and develop structural materials in the materials field community.

关键词： Glassy-crystal laminates bulk metallic glasses High entropy alloys Shape memory alloys Microstructure Deformation mechanisms Future solutions

Spray-drying assisted layer-structured H_(2)TiO_(3) ion sieve synthesis and lithium adsorption performance

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

Chinese Journal of Chemical Engineering 2022年第5期35卷 258-267页

作者： Minxia Liu Dang Wu Dongling Qin gang Yang College of Chemical Engineering Nanjing Tech UniversityNanjing 211816China

A spray-drying assisted solid-state method to prepare spherical layer-structured H_(2)TiO_(3) ion sieve(LSTIS)particles is reported *** effects of synthesis parameters(calcination temperature,calcination time,and the lithium-titanium molar ratio)on adsorption-desorption performance(the delithiation ratio,titanium dissolution loss,and the adsorption capacity)were *** as-prepared LSTIS exhibited an equilibrium adsorption capacity of 30.08 mg·g^(-1)(average of 25.85 mg·g^(-1) over 5 cycles)and ultra-low titanium dissolution loss of less than 0.12%(average of 0.086%over 5 cycles).The LSTIS showed excellent selectivity toward Li^(+) in Na^(+),K^(+),Mg^(2+),and Ca^(2+) coexisting saline solutions where its adsorption capacity reached 27.45 mg·g^(-1) and the separation factors of Li^(+) over the coexisting cations exceeded *** data suggests that the LSTIS is promising to competitively enrich Li^(+) from saline solutions.

关键词： Spray-drying Ion sieve Adsorption Lithium Dissolution loss

Research Progress of Parallel Control and Management

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2020年第2期7卷 355-367页

作者： gang Xiong Xisong Dong Hao Lu Dayong Shen State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China School of Computer Science and Technology Beijing Institute of TechnologyBeijing 100081China College of Systems Engineering National University of Defense TechnologyChangsha 410073China

based on ACP(artificial systems,computational experiments,and parallel execution)methodology,parallel control and management has become a popularly systematic and complete solution for the control and management of complex *** paper focuses on summarizing comprehensive review of the research literature of parallel control and management achieved in the recent years including the theoretical framework,core technologies,and the application *** future research,application directions,and suggestions are also discussed.

关键词： ACP methodology artificial systems computational experiments parallel control parallel management parallel systems