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China Ocean Engineering 2022年第4期36卷 575-587页

作者： LI Song WU wen-hua yao Wei-an Faculty of Vehicle Engineering and Mechanics Dalian University of TechnologyDalian 116024China State Key Laboratory of Structural Analysis of Industrial Equipment Dalian University of TechnologyDalian 116024China Research Institute of Dalian University of Technology in Shenzhen Gaoxin South fourth Road Nanshan DistrictShenzhen 518057China

Hydrodynamic numerical simulations are used to conduct structural analyses and inform the design of engineered marine *** this paper,a hydrodynamic numerical model of“Nanhai Tiaozhan”(NHTZ)FPS platform was established according to its design *** model was assessed with two sets of field monitoring data representing harsh and conventional sea *** motion responses of the platform according to the measured data and the hydrodynamic simulation were compared by reviewing their statistical characteristics,distributions,and spectrum *** comparison showed that the hydrodynamic model could correctly simulate the frequency domain characteristics of the motion responses of the ***,the simulation underestimated the reciprocating motions of the floating body and the influence of slow drift on the motion of the ***,analysis of the monitoring data revealed that the translational degrees of freedom(DOF)and rotational DOF of the platform were coupled,but these coupled motion states were not apparent in the hydrodynamic simulation.

关键词： prototype monitoring hydrodynamic numerical simulation statistical characteristics semisubmersible platform reciprocating motions

Advanced Li-SexSy battery system:Electrodes and electrolytes

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Journal of Materials Science & Technology 2020年第20期52卷 1-15页

作者： huan Du Shihao Feng wen Luo Liang Zhou Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China Department of Physics School of ScienceWuhan University of TechnologyWuhan430070China

The worldwide energy shortage has led to numerous researches for the exploration of new-type battery materials to deal with the energy *** achieve a great leap in energy density,the study of high capacity electrode materials plays a major *** a replacement to the energy accumulation system of lithium-sulfur(Li-S) and lithium-selenium(Li-Se) batteries,great concern is generated over lithium/selenium-sulfur(Li-SexSy) batteries as they combine the advantages of S(high capacity) and Se(improved electrical conductivity),consequently stands for extensive new cathode *** recent years,widespread researches have been conducted and great achievements have been *** review sums up the research status on Li-SexSy batteries and concentrates on the outstanding work of SexSy cathode *** reaction mechanism and capacity fading mechanism are *** performance-structure relationship is stated in regard of different cathode structures,including a variety of carbon hosts,conducting polymer hosts,transition metal-doped carbon electrodes and various Se/S *** compatibilities of frequently-used carbonate-based and ether-based electrolyte and other new-type electrolytes for Li-SexSy battery are *** for the future developments of Li-SexSy batteries are finally proposed.

关键词： Selenium-sulfur Cathode materials Electrolytes Lithium-sulfur

Numerical simulation on the seismic performance of retrofitted masonry walls based on the combined finite-discrete element method

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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 777-805页

作者： Wu Biye Dai Junwu Jin huan Bai wen Chen Bowen Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin 150080China Guangdong University of Petrochemical Technology Maoming 525000China

Due to the long construction life,improper design methods,brittle material properties and poor construction techniques,most existing masonry structures do not perform well during *** retrofitting method using an external steel-meshed mortar layer is widely used to retrofit existing masonry *** the seismic performance of masonry walls reinforced by an external steel-meshed mortar layer reasonably and effectively is a difficult subject in the research field of masonry *** on the combined finite-discrete elements method,the numerical models of retrofitted brick walls with four different masonry mortar strengths by an external mortar layer are *** shear strength of mortar and the contact between the retrofitted mortar layer and the brick blocks are discussed in *** failure patterns and load-displacement curves of the retrofitted brick walls were obtained by applying low cycle reciprocating loads to the numerical model,and the bearing capacity and the failure mechanism of the retrofitted walls were obtained by comparing the failure patterns,ultimate bearing capacity,deformability and other aspects with the *** study provides a basis for improving the seismic strengthening design method of masonry structures and helps to better assess the seismic performance of masonry structures after retrofitting.

关键词： masonry wall external steel-meshed mortar layer combined finite-discrete element method hysteretic curve ultimate bearing capacity

Joining of dissimilar metals between magnesium AZ31B and aluminum A6061-T6 using galvanized steel as a transition joining layer

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Journal of Iron and Steel Research International 2022年第4期29卷 677-686页

作者： Wei Li Jing-huan Chang Bao-feng wen Rui Cao State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metal Lanzhou University of TechnologyLanzhou 730050GansuChina Department of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050GansuChina

A galvanized steel is used to join Mg AZ31B alloy and Al A6061-T6 alloy as a joining transition layer by cold metal transfer(CMT)***,to optimize the process variables,extensive welding tests were performed by a design of experiment ***,microstructures,joining mechanisms and tensile properties were characterized and *** indicated that Mg and Al alloys can be joined by using galvanized steel as a joining transition layer and cold metal transfer welding *** formed joint is called as a Mg–steel–Al CMT *** using galvanized steel transition joining layer,Mg–Al brittle intermetallics Al12Mg17 and Al3Mg2 were *** properties of Mg–steel–Al CMT joints have been improved after optimizing the welding *** strength of Mg–steel–Al CMT joint is comparable to those of Al–Al joint and Mg–Mg *** strength of Mg–steel–Al CMT joint can reach 100%that of Al–Al joint and Al–steel joint,and reach 90%that of Mg–Mg joint and Mg–steel *** optimized Mg–steel–Al CMT welded joint with galvanized steel transition layer is fractured at the heat affected zone of Al base metal rather than at the weld-brazed interface,due to softening of Al base metal.

关键词： Cold metal transfer Mg alloy Al alloy Galvanized steel Transition joining layer Dissimilar metal joining

An efficient lossy link localization approach for wireless sensor networks

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Frontiers of Information Technology & Electronic Engineering 2017年第5期18卷 689-707页

作者： wen-yan CUI Xiang-ru MENG Bin-feng YANG huan-huan YANG Zhi-yuan ZHAO College of Information and Navigation Air Force Engineering UniversityXi'an 710077China Department of Electronic Engineering Tsinghua UniversityBeijing 100084China PLA of 94543 lining 272000China

Network fault management is crucial for a wireless sensor network(WSN) to maintain a normal running state because faults(e.g., link failures) often occur. The existing lossy link localization(LLL) approach usually infers the most probable failed link set first, and then gives the fault hypothesis set. However, the inferred failed link set contains many possible failures that do not actually occur. That quantity of redundant information in the inferred set can pose a high computational burden on fault hypothesis inference, and consequently decreases the evaluation accuracy and increases the failure localization time. To address the issue, we propose the conditional information entropy based redundancy elimination(CIERE), a redundant lossy link elimination approach, which can eliminate most redundant information while reserving the important information. Specifically, we develop a probabilistically correlated failure model that can accurately reflect the correlation between link failures and model the nondeterministic fault propagation. Through several rounds of mathematical derivations, the LLL problem is transformed to a set-covering problem. A heuristic algorithm is proposed to deduce the failure hypothesis set. We compare the performance of the proposed approach with those of existing LLL methods in simulation and on a real WSN, and validate the efficiency and effectiveness of the proposed approach.

关键词： Lossy link localization Redundancy eliminating algorithm Set-covering Wireless sensor networks(WSNs) Network diagnosis

Structure and Aromaticity of AlCO-substituted Semibullvalene

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Chinese Journal of Structural Chemistry 2007年第8期26卷 897-901页

作者： yao wen-Zhi WU Hai-Shun Chemistry and Material Science Institute Shanxi Normal University Linfen 041004 China

The structures, energies and aromaticity （the nuclear-independent chemical shifts,NICS） of AlCO-substituted semibullvalenes were investigated at the B3LYP/6-311＋G＊＊ *** to BCO-substituted analogues, [2,6]-AlCO-semibullvalene is neutral *** NICS values reveal that the aromaticity of AlCO-substituted structures is smaller than that of BCO analogues.

关键词： DFT semibullvalene AlCO aromaticity

ANALYTICAL TREATMENT OF BOUNDARY INTEGRALS IN DIRECT BOUNDARY ELEMENT ANALYSIS OF PLAN POTENTIAL AND ELASTICITY PROBLEMS

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Applied Mathematics and Mechanics(English Edition) 2001年第6期22卷 664-673页

作者： ZHANG yao-ming(张耀明) SUN huan-chun(孙焕纯) Department of Mathematics and Physics Shandong Institute of Engineering Zibo 255012 P R China Department of Mechanics Dalian University of Technology Dalian 116023 P R China

An analytical scheme, which avoids using the standard Gaussian approximate quadrature to treat the boundary integrals in direct boundary element method (DBEM) of two-dimensional potential and elastic problems, is established. With some numerical results, it is shown that the better precision and high computational efficiency, especially in the band of the domain near boundary, can be derived by the present scheme.

关键词： potential/elasticity problems analytical method boundary element

Total glucosides of paeony improve complete freund’s adjuvant-induced rheumatoid arthritis in rats by inhibiting toll-like receptor 2-mediated tumor necrosis factor receptor-associated factor 6/nuclear factor-kappa B pathway activation

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Journal of Traditional Chinese Medicine 2019年第4期39卷 566-574页

作者： Chen huan wen Yueqiang Pan Ting Xu Shijun Institute of Meterial Medica Integration and Transformation for Brain Disorders CDUTCMChengdu 610075China Chengdu University of Traditional Chinese Medicine Chengdu 610075China

OBJECTIVE: To investigate the mechanism underlying anti-inflammatory and immunoregulatory effect of total glucosides of paeony(TGP) based on toll-like receptor 2(TLR2) mediated tumor necrosis factor(TNF) receptor-associated factor 6(TRAF6)/nuclear factor-kappa B(NF-κB) pathway activation in rats with rheumatoid ***: Adjuvant arthritis(AA) model was developed by complete freund’s adjuvant(CFA) immunization. TGP(100, 50, 25 mg/kg) and celecoxib(2.8 mg/kg) were administered by intragastric administration for 21 d. Right hind paw swelling was assessed every 2 d. After 21 d, synovial changes of the ankle were detected by histopathology. CD4+and CD8+ T cell amounts in peripheral blood were measured by flow-cytometrically. Gene and protein levels of toll-like receptor(TLR)2, TRAF6, tumor necrosis factor ligand superfamily member 6(FASLG)in the spleen were assessed by RT-qPCR and Western Bolt, respectively. Nuclear expression of NF-κB p65 was detected by NF-κB p65 Assay ***: Paw swelling and synovium lesions were obviously aggravated in AA rats. These symptoms were significantly relieved by *** ratio of CD4+/CD8+ T cell was increased in AA rats, while TGP reduced this increased *** and protein levels of splenic TLR2, TFAR6 and FASLG, and nuclear NF-κB p65 in AA rats were significantly increased, but overtly inhibited by ***: These findings suggest that TGP’s anti-inflammatory effect onRA in rats with CFA may be related to the downregulation of TLR2/TRAF6/NF-κB pathway and the regulation of T cell subsets.

关键词： Arthritis,rheumatoid Arthritis,experimental Toll-like receptor 2 TNF receptor-associated factor 6 Transcription factor RelA Fas ligand protein CD4-CD8 ratio Total glucosides of paeony

Preliminary results of CCD observations targeting Himalia acquired at Yunnan Observatories in 2015

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Research in Astronomy and Astrophysics 2016年第12期16卷 59-66页

作者： huan-wen Peng Na Wang Qing-Yu Peng Sino-French Joint Laboratory for Astrometry Dynamics and Space ScienceJinan UniversityGuangzhou 510632China Yunnan Observatories Chinese Academy of SciencesKunming 650216China University of Chinese Academy of Sciences Beijing 100049China

In order to study the potential associated with high precision CCD astrometry of irregular satel- lites, we have acquired experimental observations of Himalia, the sixth and irregular satellite of Jupiter. A total of 185 CCD observations were obtained by using the 2.4m and 1 m telescopes administered by Yunnan Observatories over ten nights. Preliminary analysis of the observations were made, including geo- metric distortion, atmospheric refraction, and also the phase effect. All positions of Himalia are measured relative to the reference stars from the catalog UCAC4 in each CCD field of view. The theoretical positions of Himalia were retrieved from the Institute de M6chanique C61este et de Calcul des t^ph6m6rides, while the positions of Jupiter were obtained based on the planetary ephemeris INPOP13c. The results show that the means of observed minus computed （O - C） residuals are -0.004＂ and -0.002＂ in right ascension and declination, respectively. The standard deviations of （O - C） residuals are estimated to be about 0.04＂ in each direction.

关键词： astrometry -- planets and satellites: individual (Himalia) -- methods: observational

Predicting Surface Urban Heat Island in Meihekou City, China: A Combination Method of Monte Carlo and Random Forest

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Chinese Geographical Science 2021年第4期31卷 659-670页

作者： ZHANG yao LIU Jiafu wen Zhuyun College of Tourism and Geographical Sciences Jilin Normal UniversitySiping 136000China

Given the rapid urbanization worldwide, Urban Heat Island(UHI) effect has been a severe issue limiting urban sustainability in both large and small cities. In order to study the spatial pattern of Surface urban heat island(SUHI) in China’s Meihekou City, a combination method of Monte Carlo and Random Forest Regression(MC-RFR) is developed to construct the relationship between landscape pattern indices and Land Surface Temperature(LST). In this method, Monte Carlo acceptance-rejection sampling was added to the bootstrap layer of RFR to ensure the sensitivity of RFR to outliners of SUHI effect. The SHUI in 2030 was predicted by using this MC-RFR and the modeled future landscape pattern by Cellular Automata and Markov combination model(CA-Markov). Results reveal that forestland can greatly alleviate the impact of SUHI effect, while reasonable construction of urban land can also slow down the rising trend of SUHI. MC-RFR performs better for characterizing the relationship between landscape pattern and LST than single RFR or Linear Regression model. By 2030, the overall SUHI effect of Meihekou will be greatly enhanced, and the center of urban development will gradually shift to the central and western regions of the city. We suggest that urban designer and managers should concentrate vegetation and disperse built-up land to weaken the SUHI in the construction of new urban areas for its sustainability.

关键词： Monte Carlo and Random Forest Regression(MC-RFR) landscape pattern surface heat island effect Cellular Automata and Markov combination model(CA-Markov)