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Multi-physics coupling field finite element analysis on giant magnetostrictive materials smart component

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第5期10卷 653-660页

作者： zhang-rong ZHAO yiojie WU Xin-jian gu Lei zhang Ji-feng yang State Key Laboratory of Fluid Power Transmission and Control Modern Manufacture Engineering Institute Zhejiang University Hangzhou 310027 China Department of Mechanical & Electronic North China Institute of Science and Technology Beijing 101601 China

This study presents a new method to solve the difficult problem of precise machining a non-cylinder pinhole of a piston using embedded giant magnetostrictive material (GMM) in the component. We propose the finite element model of GMM smart component in electric, magnetic, and mechanical fields by step computation to optimize the design of GMM smart com-ponent. The proposed model is implemented by using COMSOL multi-physics V3.2a. The effects of the smart component on the deformation and the system resonance frequencies are studied. The results calculated by the model are in excellent agreement (relative errors are below 10%) with the experimental values.

关键词： Smart component Giant magnetostrictive Finite element method (FEM) modeling Non-cylinder piston pinhole Multi-physics coupling field

The study of a neutron spectrum unfolding method based on particle swarm optimization combined with maximum likelihood expectation maximization

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Nuclear Science and Techniques 2023年第4期34卷 149-160页

作者： Hong-Fei Xiao Qing-Xian zhang He-yi Tan Bin Shi Jun Chen Zhi-Qiang cheng jian zhang Rui yang Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu University of TechnologyChengdu 610059China National Key Laboratory for Metrology and Calibration Techniques China Institute of Atomic EnergyBeijing 102413China

The neutron spectrum unfolding by Bonner sphere spectrometer(BSS) is considered a complex multidimensional model,which requires complex mathematical methods to solve the first kind of Fredholm integral equation. In order to solve the problem of the maximum likelihood expectation maximization(MLEM) algorithm which is easy to suffer the pitfalls of local optima and the particle swarm optimization(PSO) algorithm which is easy to get unreasonable flight direction and step length of particles, which leads to the invalid iteration and affect efficiency and accuracy, an improved PSO-MLEM algorithm, combined of PSO and MLEM algorithm, is proposed for neutron spectrum unfolding. The dynamic acceleration factor is used to balance the ability of global and local search, and improves the convergence speed and accuracy of the algorithm. Firstly, the Monte Carlo method was used to simulated the BSS to obtain the response function and count rates of BSS. In the simulation of count rate, four reference spectra from the IAEA Technical Report Series No. 403 were used as input parameters of the Monte Carlo method. The PSO-MLEM algorithm was used to unfold the neutron spectrum of the simulated data and was verified by the difference of the unfolded spectrum to the reference spectrum. Finally, the 252Cf neutron source was measured by BSS, and the PSO-MLEM algorithm was used to unfold the experimental neutron *** with maximum entropy deconvolution(MAXED), PSO and MLEM algorithm, the PSO-MLEM algorithm has fewer parameters and automatically adjusts the dynamic acceleration factor to solve the problem of local optima. The convergence speed of the PSO-MLEM algorithm is 1.4 times and 3.1 times that of the MLEM and PSO algorithms. Compared with PSO, MLEM and MAXED, the correlation coefficients of PSO-MLEM algorithm are increased by 33.1%, 33.5% and 1.9%, and the relative mean errors are decreased by 98.2%, 97.8% and 67.4%.

关键词： Particle swarm optimization Maximum likelihood expectation maximization Neutron spectrum unfolding Bonner spheres spectrometer Monte Carlo method

Palladium-catalyzed Cascade Cyclization-Coupling Reaction of Benzyl Halides with N, N-Diallylbenzoylamide

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Chinese Chemical Letters 2003年第8期14卷 771-772页

作者： yi Min HU Yu zhang jian Lin HAN cheng jian ZHU yi PAN School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093

A novel type of palladium-catalyzed cascade cyclization-coupling reaction has been found. Reaction of N, N-diallylbenzoylamide 1 with benzyl halides 2 afforded the corresponding dihydropyrroles 3 in moderate to excel... 详细信息

关键词： Palladium Heck reaction benzyl halides cyclization cascade reaction.

Assessment of Heavy Metals,Polycyclic Aromatic Hydrocarbons,and Perfluorinated Alkyl Substances in two Marine Crustaceans(Oratosquilla oratoria and Portunus trituberculatus)in the Zhoushan Fishing Ground of China East Sea

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Journal of Ocean University of China 2021年第6期20卷 1587-1596页

作者： MEI guangming zhang Xiaojun gu Jie FANG yi yang Wenge College of Food and Pharmaceutical Sciences and Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province Ningbo UniversityNingbo 315800China Zhejiang Marine Fisheries Research Institute Zhoushan 316021China

Heavy metals,polycyclic aromatic hydrocarbons(PAHs),and perfluorinated alkyl substances(PFASs)polluted in 155 samples of two marine crustaceans(Oratosquilla oratoria and Portunus trituberculatus)harvested in the Zhoushan fishing ground in the East China Sea were *** results showed that Pb,Hg,and iAs in the whole edible parts of *** and *** were at trace levels,far below the limits set by the China’s national standard,whereas the exceeding standard rates of Cd in the whole edible parts of *** and *** were 98.6%and 75.6%,***,the average Cd levels and the exceeding standard rates of Cd in the visceral tissues of *** were significantly higher than those in the muscle tissues(4.64 mg kg^(−1)vs.0.49 mg kg^(−1)and 96.7%vs 30%,respectively).PAHs with high detection frequency in the two marine crustaceans included NA,AC,FL,and *** contents of 15 PAHs(abbreviated asΣ15 PAHs)in whole edible parts of *** and *** were 10.75–65.9μg kg^(−1)(mean=18.7μg kg^(−1)and 13.26–181μg kg^(−1)(mean=24.2μg kg^(−1),and those in the muscle and the visceral tissues of *** were 9.58–160μg kg^(−1)(mean=21.1μg kg^(−1)and 18.22–201μg kg^(−1)(mean=32.7μg kg^(−1),***,PFASs that were found at high contents included PFOA,PFOS,and PFOSA,and total contents of 23 PFASs(Σ23 PFASs)ranged 0.0162–5.104μg kg^(−1)(mean=0.915μg kg^(−1).Collectively,the present work provides new data on the contamination in two marine crustaceans captured in the Zhoushan fishing ground in the China East Sea,which can be useful for making suggestions on proper consumption amounts of the two marine crustaceans.

关键词： Zhoushan fishing ground Oratosquilla oratoria Portunus trituberculatus heavy metal polycyclic aromatic hydrocarbons perfluorinated alkyl substances

Dynamic Response Analysis and Vibration Control for A Fixed-Bottom Offshore Wind Turbine Subjected to Multiple External Excitations

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China Ocean Engineering 2022年第1期36卷 50-64页

作者： XIE Shuang-yi zhang cheng-lin HE Jiao jianG Jing GAO jian College of Mechanical Engineering Chongqing University of TechnologyChongqing 400054China Fishery Machinery and Instrument Research Institute Chinese Academy of Fishery SciencesShanghai 200092China College of Engineering Science and Technology Shanghai Ocean UniversityShanghai 201306China School of Mechanical and Power Engineering Chongqing University of Science&TechnologyChongqing 401331China Chongqing Vocational College of Public Transportation Chongqing 402247China Beijing Institute of Precision Mechatronics and Controls Beijing 100076China

For the offshore wind turbines installed in earthquake areas,their operation is affected by seismic loads in addition to wind and wave ***,it is necessary to study the dynamic responses and vibration control of the wind *** previous studies,the structural responses of offshore wind turbines are usually investigated in the parked case,while the blade rotation effect is usually not *** evaluation on the structural responses may be inaccurate under this condition,further affecting the evaluation on the vibration control performance of a control *** view of it,this paper established a complete multi-body model of a fixed-bottom offshore wind turbine considering pile-soil interaction,and then performed simulations when the wind turbine was subjected to multiple external ***,a single tuned mass damper(STMD)system and a multiple tuned mass dampers(MTMDs)system were applied to control structural vibrations of the wind ***,based on the construction of a simplified main structure-TMD system,TMD parameters were ***,twelve load cases including operating and parked conditions were selected to perform *** show that the influence of the seismic excitation on blade responses is greater under the parked condition than that under the operating ***,STMD/MTMDS exhibit better performance under the parked condition than that under the operating *** with STMD,MTMDS can better suppress the vibrations at both the fundamental and high-order modes,and exhibits significant robustness under the condition of changing soil parameters.

关键词： multi-body dynamics vibration control STMD/MTMDS earthquake loading SIMPACK

Correlation-induced coherence and its use in detecting quantum phase transitions

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Science China(Physics,Mechanics & Astronomy) 2022年第10期65卷 29-37页

作者： Ming-Ming Du Abdul Sattar Khan Zhao-yi Zhou da-jian zhang Department of Physics Shandong UniversityJinan 250100China

The past two decades have witnessed a surge of interest in exploring correlation and coherence measures to investigate quantum phase transitions(QPTs). Here, motivated by the continued push along this direction, we propose a measure which is built upon the so-called degree of coherence, and advocate using the susceptibility of our measure to detect QPTs. We show that our measure can capture both the notions of coherence and correlations exhibited in bipartite states and therefore represents a hybrid of these two notions. Through examining the XXZ model and the Kitaev honeycomb model, we demonstrate that our measure is favorable for detecting QPTs in comparison to many previous proposals.

关键词： correlation measures coherence measures quantum phase transitions

The association between metabolic syndrome and advanced prostate cancer in Chinese patients receiving radical prostatectomy

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Asian Journal of Andrology 2015年第5期17卷 839-844,I0011页

作者： gui-Ming zhang Yao Zhu da-Hai Dong cheng-Tao Han cheng-Yuan gu Wei-Jie gu Xiao-jian Qin Li-jiang Sun Ding-Wei Ye Department of Urology Fudan University Shanghai Cancer Center Shanghai China Department of Oncology Shanghai Medical College Fudan University Shanghai China Department of Urology The Affiliated Hospital of Qingdao University Qingdao Shandong China

The global incidence of metabolic syndrome （MetS） is dramatically increasing. Considerable interest has been devoted to the relationship between MetS and prostate cancer （PCa） risk. However, few studies have examined the association between MetS and PCa progression. This retrospective study consisted of 1016 patients with PCa who received radical prostatectomy. The association between MetS and pathological features was evaluated using logistic regression analysis. Compared with patients without MetS, those with MetS indicated an increased risk of prostatectomy Gleason score （GS）≥8 （odds ratio [OR] =1.670, 95% confidence interval （CI） 1.096-2.545, P = 0.017）, and a 1.5-fold increased risk of pT3-4 disease （OR = 1.583, 95% CI 1.106-2.266, P = 0.012）. The presence of MetS was an independent predictor of lymph node involvement （OR = 1.751, 95% CI 1.038-2.955, P = 0.036）. Furthermore, as the number of MetS components accumulated, the risk of a GS ≥ 8 increased. The present study indicates a significant association between MetS and advanced PCa. The results need to be evaluated in large-scale prospective cohorts.

关键词： Gleason score metabolic syndrome pathology prostate cancer

Review on desulfurization in electroslag remelting

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International Journal of Minerals,Metallurgy and Materials 2021年第1期28卷 18-29页

作者： cheng-bin Shi yi Huang jian-xiao zhang Jing Li Xin Zheng State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Electroslag remelting(ESR) gives a combination of liquid metal refining and solidification structure *** of the typical aspects of liquid metal refining during ESR for the advanced steel and alloy production is *** involves two patterns, i.e., slag–metal reaction and gas–slag reaction(gasifying desulfurization).In this paper, the advances in desulfurization practices of ESR are *** effects of processing parameters, including the initial sulfur level of consumable electrode, remelting atmosphere, deoxidation schemes of ESR,slag composition, melting rate, and electrical parameters on the desulfurization in ESR are *** interrelation between desulfurization and sulfide inclusion evolution during ESR is discussed, and advancements in the production of sulfur-bearing steel at a high-sulfur level during ESR are *** remaining challenges for future work are also proposed.

关键词： electroslag remelting desulfurization sulfide inclusions sulfur-bearing steel gasifying desulfurization desulfurization mechanism

Reaction mechanism between Al_(2)O_(3)–MgO refractory materials and rare earth high-carbon heavy rail steel

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Journal of Iron and Steel Research International 2024年第5期31卷 1153-1163页

作者： yi Wang guang-jie Song Ping Shen jian-zhong He da-xian zhang jian-xun Fu Center for Advanced Solidification Technology(CAST) School of Materials Science and EngineeringState Key Laboratory of Advanced Special SteelShanghai UniversityShanghai200444China State Key Laboratory of Baiyunebo Rare Earth Resources Research and Comprehensive Utilization Baotou014030Inner MongoliaChina Inner Mongolia Baotou Steel Union Co. Ltd.Baotou014030Inner MongoliaChina

Submerged entry nozzle(SEN)clogging is a major problem affecting the production quality of rare earth steel,and finding a suitable refractory outlet can significantly reduce production *** explore the relationship between refractory composition and interface interaction,unprotected coated Al_(2)O_(3)–MgO refractories and SiO2-coated Al_(2)O_(3)–MgO refractories were added to rare earth high-carbon heavy rail steel under laboratory conditions,and the Al_(2)O_(3)–MgO refractory was found to be more *** results show that,from the epoxy resin side to the refractory side,the contour of the refractory interface reaction layer can be divided into two main layers:an iron-rich reaction layer and an iron-poor reaction *** based on the spherical model suggest that the adhesion force is proportional to the size of the refractory particles and inclusions,and the same result applies to the surface *** the inclusions at a smaller size has a specific effect on alleviating the erosion of *** with the erosion mechanism of Al_(2)O_(3)–MgO refractories,the interface reaction mechanism between Al_(2)O_(3)–MgO refractories and molten steel was proposed,which provides ideas for solving SEN clogging.

关键词： Rare earth high-carbon heavy rail steel Al_(2)O_(3)-MgO refractory Adhesion Surface tension Interface interaction