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Investigation on the Cavitation Effect of Underwater Shock near Different Boundaries

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China Ocean Engineering 2017年第4期31卷 396-407页

作者： XIAO Wei WEI Hai-peng feng Liang College of Engineering Ocean University of China Qingdao 266100 China Beijing Institute of Astronautica System Engineering Beijing 100076 China

When the shock wave of underwater explosion propagates to the surfaces of different boundaries, it gets reflected. Then, a negative pressure area is formed by the superposition of the incident wave and reflected wave. Cavitation occurs when the value of the negative pressure falls below the vapor pressure of water. An improved numerical model based on the spectral element method is applied to investigate the cavitation effect of underwater shock near different boundaries, mainly including the feature of cavitation effect near different boundaries and the influence of different parameters on cavitation effect. In the implementation of the improved numerical model, the bilinear equation of state is used to deal with the fluid field subjected to cavitation, and the field separation technique is employed to avoid the distortion of incident wave propagating through the mesh and the second-order doubly asymptotic approximation is applied to simulate the non-reflecting boundary. The main results are as follows. As the peak pressure and decay constant of shock wave increases, the range of cavitation domain increases, and the duration of cavitation increases. As the depth of water increases, the influence of cavitation on the dynamic response of spherical shell decreases.

关键词： underwater explosion cavitation fluid structure interaction spectral element boundary

Development of BINOL-Si complexes with large stokes shifts and their application as chemodosimeters for nerve agent

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Chinese Chemical Letters 2020年第11期31卷 2960-2964页

作者： Xu feng Yawen Wang Wenlin feng Yu peng State Key Laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhou 730000China School of Life Science and Engineering Southwest Jiaotong UniversityChengdu 610031China Department of Physics and Energy Chongqing University of TechnologyChongqing 400054China

Three fluorescent BINOL-Si complexes(FS1,FS2 and FS3)were rationally designed and synthesized to detect diethyl chlorophosphate(DCP),a mimic of lethal nerve *** three fluorescent probes showed green,yellow and orange fluorescence,***,the series of fluorescent probes has the characteristics of fast response time(4 s),low detection limit(0.0097 mmol/L),high sensitivity and naked eye *** important,a fiber optic sensor capable of detecting DCP vapor in real time was also prepared for the first time,the lowest detection limits(down to 4.4 ppb)were all lower than that of the IDLH(immediately dangerous to life or health)concentration of Sarin(7.0 ppb).

关键词： Nerve agent BINOL derivatives Si complex Fluorescent probe DCP

Thermal stability improvement of sprayable fast-responding pressure-sensitive paint for measurement above 100℃

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Chinese Journal of Aeronautics 2021年第1期34卷 320-326页

作者： Di peng feng GU Zhe ZHONG Yingzheng LIU Key Lab of Education Ministry for Power Machinery and Engineering School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Gas Turbine Research Institute Shanghai Jiao Tong UniversityShanghai 200240China

The thermal stability of sprayable fast-responding Pressure-Sensitive Paint(fast PSP)was investigated to explore the possibility for application in turbomachinery and hypersonic research with temperature above 100℃.The first part of the study focused on a widely-used Polymer Ceramic PSP(PC-PSP).The effects of thermal degradation on its key sensing properties,including luminescent intensity,pressure sensitivity and response time,were examined for a temperature range from 60 to 100℃.Severe degradation in intensity and pressure sensitivity was found as temperature reached 70℃or higher,which would cause failure of PSP application in these ***,a fast-responding Mesoporous-Particle PSP(MP-PSP)was developed which did not show degradation effects until 140℃.The greatly improved thermal stability of MP-PSP was attributed to:selection of polymer with higher glass transition temperature(polystyrene)to delay the saturation effect of oxygen quenching as temperature increased;porous and hollow structure of particles for luminophore deposition that minimizes polymer–luminophore *** new paint formulation has significantly raised the upper temperature limit of fast PSP and offers more opportunities for applications in harsh environment.

关键词： Dynamic response Polymer–luminophore interaction Pressure sensitivity Pressure-sensitive paint Thermal degradation

Platinum-based ternary catalysts for the electrooxidation of ethanol

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Particuology 2021年第5期19卷 169-186页

作者： Guangxing Yang Qiao Zhang Hao Yu feng peng State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510641PR China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510641PR China School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006PR China

Direct ethanol fuel cell(DEFC)as a promising device for converting chemical energy to electricity has been paid ever-increasing ***,the slow kinetics of ethanol electrooxidation at an anode hinders the application of *** Pt is the best catalyst among all the pure metal catalysts,it still has a relatively poor ability to break the Csingle bondC bond,is deactivated by the accumulated CO_(ad) intermediates,and undergoes unwanted desired structure change over long-term *** recent years,the addition of other metals to form binary,ternary,and quaternary catalysts have significantly improved electroactivity and *** catalysts can have numerous element combinations and complicated architectures and,therefore,have been the subject of considerable *** this review,most of the reported ternary catalysts will be summarized and categorized according to their structure while discussing the essence of the role of each component.

关键词： Direct ethanol fuel cell Ethanol oxidation reaction Ternary catalyst Composition-reactivity relationship

Coulomb stress and gravity changes associated with the 2016 Mw 7.8 Kaikoura Earthquake, New Zealand: Application for aftershock triggering and fault interaction process analysis

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Journal of Mountain Science 2021年第2期18卷 510-527页

作者： HASSAN Abubakr HUANG Ding-fa JIANG Zhong-shan ZHANG Lu-peng faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China Surveying Engineering Department Faculty of EngineeringKarary UniversityKhartoum 12304Sudan

The Kaikoura earthquake on November 14,2016 is one of the largest and most complex earthquakes in New Zealand since *** the fact that it has ruptured about 12 separate faults,triggered 2132 aftershocks within one week of the mainshock and induced considerable stress changes,few studies have been conducted to comprensively investigate the *** current study examines the horizontal and vertical displacements as well as the stress and gravity changes,aftershock distributions and also find out whether these changes affect the surrounding regions along the complex fault *** study covers the entire area affected by the Kaikoura event,which includes the northern part of the South Island and the southern part of the North *** dislocation theory was employed to evaluate the coseismic slip model on the multiple *** displacement results revealed that the maximum horizontal displacement is about 6 m and the vertical about 2 m,which are reasonably consistent with earlier study ***,the stress and gravity changes are quite complicated and inhomogeneous as evidenced by our coseismic model,demonstrating the complexity of the Kaikoura earthquake as *** all the aftershocks are distributed in places where the stress and gravity change are found to be *** order to investigate the stability of our stress change models,we applied different friction coefficients and receiver fault *** results justify the friction coefficient(μ=0.4)and the receiver fault parameters(230°,70°,150°)are suitable to define good stress change *** to the stress change results at 15 km depth,the northern parts of the mainshock region,Hundalee fault,Humps fault and Jordan thrust areas together with the Wellington area are closer to failure and situated in a seismic risk *** multidimensional analysis adopted in this paper is helpful for making decisions and applications of stress and gravity change models in

关键词： Aftershock triggering Components displacement Coulomb failure stress fault interaction Gravity change Kaikoura earthquake

High permeability and bimodal resonance structure of flaky soft magnetic composite materials

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Chinese Physics B 2020年第7期29卷 528-536页

作者： Xi Liu peng Wu peng Wang Tao Wang Liang Qiao fa-Shen Li Key Laboratory of Opto-technology and Intelligent Control of Ministry of Education Lanzhou Jiaotong UniversityLanzhou 730000China Institute of Applied Magnetism Key Laboratory for Magnetism and Magnetic Materials of Ministry of EducationLanzhou UniversityLanzhou 730000China

We establish a theoretical bimodal model for the complex permeability of flaky soft magnetic composite materials to explain the variability of their initial *** new model is motivated by finding the two natural resonance peaks to be inconsistent with the combination of the domain wall resonance and the natural *** the derivation of the model,two relationships are explored:the first one is the relationship between the number of magnetic domains and the permeability,and the second one is the relationship between the natural resonance and the domain wall *** reveals that the ball milling causes the number of magnetic domains to increase and the maximum initial permeability to exist after 10 h of ball *** experiment is conducted to demonstrate the reliability of the proposed *** experimental results are in good agreement with the theoretical *** new model is of great significance for studying the mechanism and applications of the resonance loss for soft magnetic composite materials in high frequency fields.

关键词： soft magnetic composite materials bimodal resonance structure model permeability domain wall

Systematics on production of superheavy nuclei Z=119-122 in fusion-evaporation reactions

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Nuclear Science and Techniques 2021年第10期32卷 59-71页

作者： Fei Niu peng-Hui Chen Zhao-Qing feng School of Physics and Optoelectronic Technology South China University of TechnologyGuangzhou 510640China College of Electrical Energy and Power Engineering Yangzhou UniversityYangzhou 225000China

The fusion dynamics of the formation of super-heavy nuclei were investigated thoroughly within the din-uclear system *** Monte Carlo approach was implemented in the nucleon transfer process to include all possible orientations,at which the dinuclear system is assumed to be formed at the touching configuration of dinuclear *** production cross sections of superheavy nuclei Cn,Fl,Lv,Ts,and Og were calculated and compared with the available data from *** evaporation residue excitation functions in the channels of pure neutrons and charged particles were systematically *** combinations of 44 Sc,48;50 Ti,49;51 V,52;54 Cr,58;62 Fe,and 62;64 Ni bombarding the actinide nuclides 238 U,244 Pu,248 Cm,247;249 Bk,249;251 Cf,252 Es,and 243 Am were calculated to produce the superheavy elements with Z¼119?*** obtained that the production cross sections sensitively depend on the neutron richness of the reaction *** structure of the evaporation residue excitation function is related to the neutron separation energy and fission barrier of the compound nucleus.

关键词： Dinuclear system model Fusion-evaporation reactions Superheavy nuclei Cross sections

Gas‐phase fluorination of conjugated microporous polymer microspheres for effective interfacial stabilization in lithium metal anodes

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Carbon Energy 2023年第10期5卷 77-90页

作者： Zihao Li Lingchen Kong Cong peng Wei feng School of Material Science and Engineering Tianjin UniversityTianjinChina Tianjin Key Laboratory of Composite and Functional Materials TianjinChina

Lithium(Li)metal anodes have attracted extensive attention due to their ultrahigh theoretical capacity and low ***,the uneven deposition of Li near the unstable electrode/electrolyte interfaces leads to the growth of Li dendrites and the degradation of active ***,we directly fluorinate alkyne-containing conjugated microporous polymers(ACMPs)microspheres with fluorine gas(F_(2))to introduce a novel fluorinated interlayer as an interfacial stabilizer in lithium metal *** density functional theory methods,it is found that as-prepared fluorinated ACMP(faCMP)has abundant partially ionic C–F *** C–F bonds with electrochemical lability yield remarkable lithiophilicity during *** in situ reactions between the active C–F bonds and Li ions enable transfer of lithium fluoride microcrystals to the solid electrolyte interphase(SEI)layers,guaranteeing effective ionic distribution and smooth Li ***,Li metal electrodes with the fluorinated interlayers demonstrate excellent cycling performances in both half-batteries and full cells with a lithium bis(trifluoromethanesulfonyl)imide electrolyte as well as a nonfluorinated lithium bis(oxalate)borate electrolyte *** strategy is highly significant in customizable SEI layers to stabilize electrode interfaces and ensure high utilization of Li metal anodes,especially in a nonfluorinated electrolyte.

关键词： conjugated microporous polymers fluorinated solid electrolyte interphase gas‐phase fluorination lithium metal anodes nonfluorinated electrolyte

Modular Verification of SPARCv8 Code

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Journal of Computer Science & Technology 2020年第6期35卷 1382-1405页

作者： Jun-peng Zha Xin-Yu feng Lei Qiao Department of Computer Science and Technology Nanjing UniversityNanjing 210023China State Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210023China Beijing Institute of Control Engineering Beijing 100080China

Inline assembly code is common in system software to interact with the underlying hardware platforms. The safety and correctness of the assembly code is crucial to guarantee the safety of the whole system. In this paper, we propose a practical Hoare-style program logic for verifying SPARC (Scalable Processor Architecture) assembly code. The logic supports modular reasoning about the main features of SPARCv8 ISA (instruction set architecture), including delayed control transfers, delayed writes to special registers, and register windows. It also supports relational reasoning for refinement verification. We have applied it to verify that there is a contextual refinement between a context switch routine in SPARCv8 and a switch primitive. The program logic and its soundness proof have been mechanized in Coq.

关键词： Scalable Processor Architecture Version 8(SPARCv8) assembly code verification context switch Coq refinement verification