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Cladding of aluminum alloy 6061-T6 to mild steel by an electromagnetic tube bulging process: finite element modeling

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Advances in Manufacturing 2019年第1期7卷 73-83页

作者： zhi-Song fan Su-Ting Huang Jiang-Hua Deng School of Mechanical Engineering and Automation Fuzhou University Fuzhou 350116 People's Republic of China

Bimetal tubes have useful applications in various industries where service conditions demand more different requirements in the tube core than its outside surface. The recent use of electromagnetic forces to deform or join metallic workpieces at high speeds has undergone rapid growth for materials processing. However, to date, no sufficient systematic understanding of the underlying principles of a subsequent high-speed electromagnetic tube bulging process to manufacture bimetal tubes has been gained. In this work, magnetic pulse cladding of Al/Fe clad bimetal tubes was analyzed by finite element modeling (FEM) using ANSYS software. The validity of FEM analyses was first confirmed by experiments in terms of the deformed shape. Second, the effect of cladding parameters (such as axial feeding being the dominant factor in the multi-step process) on the bulging and thinning behavior of the Al clad tube was presented in detail. Both the numerical simulation and experimental results show that no more than 70% of the bulging-coil length is an appropriate amount for the feeding length to prevent defects from being introduced by non-uniform deformation in the transition zone of the Al clad tube. The distributions of the magnetic flux line, magnetic force, and plastic strain in different cladding steps were then analyzed. It was concluded that during the multi-step cladding process, there was an uneven distribution of the magnetic field force along the transition zone. Consequently, inharmonious plastic deformation behavior occurs, which results in a limited acceleration of the transition zone to a certain impact velocity.

关键词： Bimetal tubes Magnetic pulse cladding Finite element (FE) simulation Axial feeding

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A New Technique:Research and industrial application of a novel compound permanent magnet synchronous machine

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷 471-477页

作者： Cheng-zhi fan Ming-xing HUANG Yun-yue YE School of Electrical Engineering Zhejiang University Hangzhou 310027 China

We propose a novel kind of compound permanent magnet synchronous machine (CPMSM), which is applicable in low-speed and high-torque situations. We first explain the structure of the CPMSM. Based on theoretically deducing the calculation formulae of the CPMSM electromagnetic parameters, we analyze the operating characteristics of the CPMSM, and obtain the power-angle curves and working curves. The no-load magnetic field distribution and the cogging torque are analyzed by applying the finite element method of three-dimensional (3D) magnetic fields, to determine the no-load leakage coefficient and the waveform of the cogging torque. Furthermore, the optimal parameters of the permanent magnet for reducing the cogging torque are determined. An important application target of the CPMSM is in directdrive pumping units. We have installed and tested a direct- drive pumping unit in an existing oil well. Test results show that the power consumption of the direct-drive pumping unit driven by CPMSM is 61.1% of that of the beam-pumping unit, and that the floor space and weight are only 50% of those of a beam-pumping unit. The noise output does not exceed 58 dB in a range of 1 m around the machine when the machine is 1.5 m from the ground.

关键词： Compound permanent magnet synchronous machine (CPMSM) Operating characteristic Three-dimensional finite element analysis Cogging torque Direct-drive pumping unit

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Gallbladder carcinosarcoma with a poor prognosis: A case report

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World Journal of Clinical Cases 2024年第10期12卷 1817-1823页

作者： Yi Dai Min meng Qi-zhi Luo Yuan-Jun Liu fan Xiao Chun-Hua Wang Department of Hepatobiliary Surgery Suining Central HospitalSuining 629000Sichuan ProvinceChina The Cancer Center Suining Central HospitalSuining 629000Sichuan ProvinceChina Department of Pathology Suining Central HospitalSuining 629000Sichuan ProvinceChina Department of Liver Surgery&Liver Transplantation West China Hospital of Sichuan UniversityChengdu 610041Sichuan ProvinceChina

BACKGROUND Carcinosarcoma of the gallbladder is a rare malignant tumor with a very poor *** date,only approximately 100 patients have been reported in the English *** prognosis of this tumor type is poor,the preoperative diagnosis is difficult,and there is a possibility of a *** present an unsuccessful case of carcinosarcoma of the gallbladder with a preoperative misdiagnosis and rapid early postoperative ***,we have a deeper understanding of the poor prognosis of gallbladder carcinosarcoma(GBC)*** SUMMARY The patient is a 65-year-old *** was admitted to the hospital because of right upper abdomen distending pain and discomfort for half a *** magnetic resonance imaging revealed a polycystic mass in the right lobe of the liver and the fossa of the *** admission,the patient was diagnosed with a liver abscess,which was treated by abscess puncture ***,this treatment was *** and cholecystectomy were performed one month after the *** pathologic examination revealed carcinosarcoma of the gallbladder,and the resected specimen contained two tumor *** month after surgery,the patient's tumor recurred in situ and started to compress the duodenum,resulting in duodenal obstruction and *** treatment was not *** patient died of gastrointestinal hemorrhage and hypovolemic *** Carcinosarcoma of the gallbladder is a rare malignant tumor that is easily misdiagnosed preoperatively and has a poor prognosis.

关键词： Gallbladder disease Carcinosarcoma Misdiagnosis Poor prognosis Pathological diagnosis Recurrence Case report

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Mutual interference of layer plane and natural fracture in the failure behavior of shale and the mechanism investigation

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Petroleum Science 2021年第2期18卷 618-640页

作者： Peng Zhao Ling-zhi Xie zhi-Chao fan Lei Deng Jun Liu State Key Laboratory of Hydraulic and Mountain River Engineering College of Architecture and EnvironmentSichuan UniversityChengdu610065China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu610065China

Shale contains a certain amount of natural fractures,which affects the mechanical properties of *** this paper,a bonded-particle model in particle flow code(PFC)is established to simulate the failure process of layered shale under Brazilian tests,under the complex relationship between layer plane and natural ***,a shale model without natural fractures is verified against the experimental ***,a natural fracture is embedded in the shale model,where the outcomes indicate that the layer plane angle(marked asα)and the angle(marked asβ)of embedded fracture prominently interfere the failure strength anisotropy and fracture ***,sensitivity evaluations suggest that variable tensile/cohesion strength has a changeable influence on failure mechanism of shale,even for sameαor/andβ.To serve this work,the stimulated fractures are categorized into two patterns based on whether they relate to natural fracture or ***,four damage modes and the number of microcracks during the loading process are recognized quantitatively to study the mechanism of shale failure *** the failure mechanism determines the outcome of hydraulic fracturing in shale,this work is supposed to provide a significant implication in theory for the engineering operation.

关键词： PFC-based model Damage modes Tensile/cohesion strength Brazilian tests Hydraulic fracturing

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Mineralization characteristics of pellets prepared by ultrafine magnetite concentrate:influence on metallurgical property and improving method

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Journal of Iron and Steel Research International 2023年第3期30卷 446-455页

作者： Xiao-hui fan zhi-an Zhou Shu Wang Min Gan zhi-yun Ji Xu-ling Chen zhi-yuan Tian School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina Northern Engineering and Technology Corporation MCCDalian 116600LiaoningChina

The reducing property of pellets prepared by ultrafine magnetite concentrate(UMC)and improving method were *** results show that the reduction degree of UMC pellets is only about 56%compared with that of pellets prepared from ordinary iron ore concentrate with relatively coarse particle size,which is significantly lower than the general reduction degree of about 70%.When the composite binder composed of bentonite and organic binder was added,the reduction degree was significantly increased to 69.66%.The revealed mechanism shows that the reduced pellets with common bentonite have a concentric structure,the oxidation gap between the inner and outer layers is obvious,and the outer dense oxide layer hinders the oxidation and reduction of the inner *** adding the composite binder,the organic components significantly improved the internal porosity of the pellets and the aggregation degree of ultrafine iron ore concentrate particles in the granulation process,forming a porous *** non-uniform double-layer structure is eliminated,and the increased pores are conducive to the internal diffusion of CO,and finally the reduction degree of pellets is increased to the level equivalent to that of ordinary magnetite pellets.

关键词： Ultrafine magnetite concentrate Mineralization characteristics Reduction degree Improving method Function mechanism

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Multi-objective optimization of mechanical ventilation with the aid of purifiers in two scenarios:Regular operation and mitigating the spread of respiratory infectious diseases

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Building Simulation 2023年第5期16卷 795-811页

作者： Yiqun Li Yujie fan Chengqiang zhi Wei Ye Xu Zhang School of Mechanical Engineering Tongji UniversityShanghai 201804China Department of Building Science Tsinghua UniversityBeijing 100084China Key Laboratory of Engineering Structure Performance Evolution and Control Ministry of EducationTongji UniversityShanghai 200092China

COVID-19 and its impact on society have raised concerns about scaling up mechanical ventilation(MV)systems and the energy *** paper attempted to combine MV and portable air cleaners(PACs)to achieve acceptable indoor air quality(IAQ)and energy reduction in two scenarios:regular operation and mitigating the spread of respiratory infectious diseases(RIDs).We proposed a multi-objective optimization method that combined the NSGA-II and TOPSIS techniques to determine the total equivalent ventilation rate of the MV-PAC system in both *** concentrations of PM_(2.5) and CO_(2) were primary indicators for *** modified Wells-Riley equation was adopted to predict RID *** open office with an MV-PAC system was used to demonstrate the method’s ***,a field study was conducted to validate the method and evaluate occupants’perceptions of the MV-PAC *** showed that optimal solutions of the combined system can be obtained based on various IAQ requirements,seasons,outdoor conditions,*** regular operation,PACs were generally prioritized to maintain IAQ while reducing energy consumption even when outdoor PM_(2.5) concentration was *** can remain constant or be reduced at low *** RID scenarios,it is possible to mitigate transmissions when the quanta were<48 h^(−1).No significant difference was found in the subjective perception of the MV and ***,the effects of infiltration on the optimal solution can be ***,our results suggested that an MV-PAC system can replace the MV system for offices for daily use and RID mitigation.

关键词： mechanical ventilation portable air cleaners infiltration multi-objective open office

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A Light Weight Traffic Volume Prediction Approach Based on Finite Traffic Volume Data

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Journal of Systems Science and Systems Engineering 2023年第5期32卷 603-622页

作者： Xing Su Minghui fan zhi Cai Qing Liu Xiaojun Zhang Faculty of Information Technology Bering University of TechnologyBeijing100124China Shanghai Ocean University Shanghai201306China Academy of Opto-electronics Chinese Academy of SciencesBeijing100094China

As one of the key technologies of intelligent transportation systems, short-term traffic volume prediction plays an increasingly important role in solving urban traffic problems. In the last decade, many approaches were proposed for the traffic volume prediction from different perspectives. However, most of these approaches are based on a large amount of historical data. When there are only finite collected traffic data, they cannot be well trained, so the prediction accuracy of these approaches will be poor. In this paper, a tensor model is proposed to capture the change patterns of continuous traffic volumes. From collected traffic volume data, the element data are extracted to update the corresponding elements of the tensor model. Then, a tucker decomposition and gradient descent based algorithm is employed to impute the missing elements of the tensor model. After missing element imputation, the tensor model can be directly applied to the short-term traffic volume prediction through searching the corresponding elements of the model and the storage cost of the model is low. Our model is evaluated on real traffic volume data from PeMS dataset, which indicates that our model has higher traffic volume prediction accuracy than other approaches in the situation of finite traffic volume data.

关键词： Short-term traffic volume prediction tensor Tucker decomposition finite traffic volume data

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Characterization of ZrO_(2) ceramic coatings on ZrH1.8 prepared in different electrolytes by micro-arc oxidation

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Rare Metals 2022年第3期41卷 1043-1050页

作者： zhi-Gang Wang Wei-Dong Chen Shu-fang Yan Xiu-Juan fan zhi-Gao Xu College of Materials and Engineering Inner Mongolia University of TechnologyHohhot 010051China Division of Mineral Resources Metallurgy and MaterialsGeneral Research Institute for Nonferrous MetalsBeijing 100088China Key Laboratory for Green Chemical Process of Ministry of Education Wuhan Institute of TechnologyWuhan 430073China

ZrO_(2)ceramic coatings were directly prepared on the surface of ZrH_(1.8) in silicate and phosphate elec-trolytes by micro-arc oxidation(MAO)technique,*** microstructure,chemical composition and phase composition of ZrO_(2)ceramic coatings were inves-tigated by X-ray diffraction(XRD),energy-dispersive spectrometry(EDS)and scanning electron microscopy(SEM).The anti-permeation effect was measured by means of vacuum dehydrogenation *** is found that the coating fabricated in phosphate electrolyte is more compact than that in silicate *** coatings fabricated on the surface of ZrH_(1.8) are composed of M-ZrO_(2),T-ZrO_(2) and C-ZrO_(2).EDS analysis indicates that the coatings are mainly composed of O and *** dehydrogenation experiment shows that the permeation reduction factor(PRF)of coating prepared in phosphate electrolyte is su-perior to that in the silicate electrolyte,and the PRF value reaches up to 11.2,which can enhance the resistance effect of hydrogen significantly.

关键词： ZrO_(2)ceramic coating Zirconium hydride Micro-arc oxidation Hydrogen permeation barrier

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Low Infrared Emissivity and Strong Stealth of Ti-Based MXenes

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Research 2022年第4期2022卷 147-153页

作者： Xinliang Li Minghang Li Xin Li Xiaomeng fan Chunyi zhi Department of Materials Science and Engineering City University of Hong Kong83 Tat Chee AvenueKowloonHong Kong 999077China Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Polytechnical UniversityXi'an710072China

Advanced scenario-adaptable infrared(IR)stealth materials are crucial for creating localized closed thermal *** emissivity over the broadest possible band is expected,as is superior mechanical ***,we report a series of Ti-based MXenes with naturally low emissivity as ideal IR shielding *** a wavelength ranging from 2.5 to 25μm,Ti_(3)C_(2)T_(X) film delivers an average emissivity of 0.057 with the lowest point of *** a low emissivity coupled with outstanding structural shaping capability is beyond the current *** reflection-dominated mechanism is ***,some intriguing scenarios of IR stealth for wearable electronic devices and skin thermal control are *** finding lights an encouraging path toward next-generation IR shielding by the expanding MXene family.

关键词： wear Infrared Strong

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Porcine hepatocyte isolation and reversible immortalization mediated by retroviral transfer and site-specific recombination

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World Journal of Gastroenterology 2010年第13期16卷 1660-1664页

作者： meng, fan-Ying Chen, zhi-Shui Han, meng Hu, Xin-Peng He, Xing-Xing Liu, Yong He, Wen-Tao Huang, Wei Guo, Hui Zhou, Ping Huazhong Univ Sci & Technol Tongji Med Univ Tongji HospKey Lab Organ TransplantMinist Educ Inst Organ TransplantatMinist HlthTongji Med Co Wuhan 430030 Hubei Peoples R China Huazhong Univ Sci & Technol Tongji Med Coll Inst Liver Dis Tongji Hosp Wuhan 430030 Hubei Peoples R China

AIM: To develop a hepatocyte cell line, we immortalized primary porcine hepatocytes with a retroviral vector SSR#69 containing the Simian Virus 40 T antigen (SV40T ag). METHODS: We first established a method of porcine hepatocyte isolation with a modified four-step retrograde perfusion technique. Then the porcine hepatocytes were immortalized with retroviral vector SSR#69 expressing SV40T and hygromycin-resistance genes flanked by paired loxP recombination targets. SV40T cDNA in the expanded cells was subsequently excised by Cre/LoxP site-specific recombination. RESULTS: The resultant hepatocytes with high viability (97%) were successfully immortalized with retroviral vector SSR#69. One of the immortalized clones showed the typical morphological appearance, TJPH-1, and was selected by clone rings and expanded in culture. After excision of the SV40T gene with Cre-recombinase, cells stopped growing. The population of reverted cells exhibited the characteristics of differentiated hepatocytes. CONCLUSION: In conclusion, we herein describe a modified method of hepatocyte isolation and subsequently established a porcine hepatocyte cell line mediated by retroviral transfer and site-specific recombination.

关键词： Hepatocyte isolation Porcine hepatocytes Reversible immortalization Simian virus 40 large T-antigen

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