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Engineering 2024年第3期34卷 83-91页

作者： Zhihui Huang Rui Wang Hui Yu Yifan Xu Cheng Cheng Guangwei Wang Haosen Cao Xiang Wei Hai-Tao Zhang School of Artificial Intelligence and Automation&the MOE Engineering Research Center of Autonomous Intelligent Unmanned Systems&the State Key Laboratory of Intelligent manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhan 430074China division of Cardiovascular Surgery Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Wuhan Children’s Hospital:Wuhan Women and Children Medical Care Center Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430010China

Acute aortic dissection is one of the most life-threatening cardiovascular diseases,with a high mortality *** prevalence ranges from 0.2%to 0.8%in humans,resulting in a significant number of deaths due to being missed in manual *** importantly,the aortic diameter—a critical indicator for surgical selection—significantly influences the outcomes of surgeries ***,it is an urgent yet challenging mission to develop an automatic aortic dissection diagnostic system that can recognize and classify the aortic dissection type and measure the aortic *** paper offers a dual-functional deep learning system called aortic dissections diagnosis-aiding system(DDAsys)that enables both accurate classification of aortic dissection and precise diameter measurement of the *** this end,we created a dataset containing 61190 computed tomography angiography(CTA)images from 279 patients from the division of Cardiovascular Surgery at Tongji Hospital,Wuhan,*** dataset provides a slice-level summary of difficult-to-identify features,which helps to improve the accuracy of both recognition and *** system achieves a recognition F1 score of 0.984,an average classification F1 score of 0.935,and the respective measurement precisions for ascending and descending aortic diameters are 0.994 mm and 0.767 mm root mean square error(RMSE).The high consistency(88.6%)between the recommended surgical treatments and the actual corresponding surgeries verifies the capability of our system to aid clinicians in developing a more prompt,precise,and consistent treatment strategy.

关键词： Aortic dissections Computed tomography angiography Classification Deep learning

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Anticipating the lifespan: Predicting the durability of an anode-supported solid oxide fuel cell short stack over 50,000 h

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Progress in Natural Science:Materials International 2024年第3期34卷 606-613页

作者： Muhammad Zubair Khan Amjad Hussain Seung-Bok Lee Tak-Hyoung Lim Rak-Hyun Song Department of Materials Science & Engineering Pak-Austria Fachhochschule: Institute of Applied Sciences and Technology Hydrogen Energy Research division Korea Institute of Energy Research Department of Advanced Energy and System Engineering Korea University of Science and Technology (UST)

In the present study, the operational lifetime of a solid oxide fuel(SOFC) short stack is predicted by investigating the performance degradation of both the short stack and its cells throughout 1000 h at 800°C. The short stack and integral cell voltages are continuously measured during the long-term test, with electrochemical impedance spectroscopy(EIS) conducted every 200 h. The short stack voltage decreased rapidly for the initial 200–300 h and afterwards, it decreased at a slow rate due to the increase in the Ohmic and polarization resistances in the same manner. Scanning electron microscopy results show that there is no delamination or cracking among constituent layers of the short-stack cells. The single degradation effects of the Ni coarsening in the anode, cation migration and surface segregation in cathode and oxide scale growth in metallic interconnect mesh are successfully integrated into a comprehensive lifetime prediction model. The experimentally measured voltage degradation data of the short stack fits well with the developed mathematical model and allows the successful prediction of the lifetime up to 50,000 h.

关键词： Degradation Impedance Lifetime SOFC Stack

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Kineto-elastodynamic analysis of hose cutting mechanism of an aluminum electrolytic capacitor casing machine

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Journal of Central South University 2017年第5期24卷 1217-1224页

作者： XIA Bi-zhong REN Shi-yuan LIU Xin-cheng XU Chao division of Advanced manufacturing Graduate School at ShenzhenTsinghua UniversityShenzhen 518055China

The kineto-elastodynamic(KED) model of a hose cutting mechanism used in the aluminum electrolytic capacitor(AEC) casing machine is developed to investigate the dynamic characteristics. According to the composition characteristics, the cutting mechanism is divided into cam-roller and linkage two substructures. And the dynamic models of the two substructures are established using the lumped parameter method and finite element method(FEM), respectively. In the model, the compliances of the camshaft and the links are taken into consideration. The elastic displacement of the links, angular error of the cutter and the dynamic stress of the links are analyzed based on the KED model. The results provide important information for structure optimization and vibration control of the mechanism.

关键词： cutting mechanism kineto-elastodynamic lumped parameter method finite element method dynamic stress

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Improving the Electrical Contact Property of Single-Walled Carbon nanotube Arrays by Electrodeposition

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nano-micro Letters 2013年第4期5卷 242-246页

作者： Min Zhang Advanced manufacturing division Graduate School at Shenzhen Tsinghua University

A parallel method for the fabrication of metal contacts on single-walled carbon nanotube(SWNT)arrays was presented and the electrical contact property was evaluated by a SWNT-field effect transistor structure. Copper and gold contacts were fabricated on both semiconducting SWNTs and metallic SWNTs by using a maskless electrodeposition process. The SWNT array remained a p-type semiconductor after the electrodeposition. The contact resistance between SWNT array and microelectrodes was reduced more than 50% by the established copper contacts. The source-drain current of the carbon nanotube field-effect transistor(CNT-FET)structure can be further increased from 7.9 μA to 9.2 μA when the copper contacts were replaced by gold ones,which is probably due to the better contact property to SWNT of gold contacts with fine grain size.

关键词： Carbon nanotube Electrodeposition Electrical contact

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Numerical simulation and experimental study for rheo-forged component using direct and indirect die system

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Transactions of Nonferrous Metals Society of China 2010年第9期20卷 1799-1804页

作者： H.H.KIM C.G.KANG Precision manufacturing Systems division Pusan National University School of Mechanical Engineering Pusan National University

Sand casting and die casting processes have been used widely for complex automotive products such as knuckle, arm, ***, a part fabricated by casting has limited strength due to manufacturing defects such as the dendrite structure, segregation and *** an attempt to offer a solution to these problems, forging has been used as an alternative ***, the forging process provides limited formability for complex shape ***-forging of metal offers not only superior mechanical strength but also requires significantly lower machine loads than solid forming *** order to produce semi-solid materials of the desired microstructure, a stirring process is applied during solidification of molten *** results of an A356 aluminum alloy sample, which are obtained by experiment and by simulation using DEFORM 3D, are present.

关键词： rheo-forging A356 alloy formability forming defects

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microstructure,Tensile and Impact Toughness Properties of Friction Stir Welded Mild Steel

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Journal of Iron and Steel Research International 2010年第10期17卷 68-74页

作者： A K Lakshminarayanan V Balasubramanian M Salahuddin Department of manufacturing Engineering Annamalai University Clean Technology division Ministry of Environment and Forests

microstructure, tensile and impact toughness properties and fracture location of friction stir welded AISI 1018 mild steel were revealed. The AISI 1018 mild steel plates with thickness of 5 mm were friction stir welded by tungsten based alloy tool with tool rotational speed of 1 000 r/min and welding speed of 50 ram/rain. Tensile strength of stir zone is higher （8%） compared to that of the base metal. This may be due to the formation of finer grains in the weld nugget region under the stirring action of the rotating tool. The ductility and impact toughness of the joints are decreased compared to those of the base metal owing to the inclusion of tungsten particles in the weld region.

关键词： friction stir welding tensile property impact toughness mildsteel

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Vanadium-Doped Magnesium Oxide nanoparticles Formation in Presence of Ionic Liquids and Their Use in Photocatalytic Degradation of Methylene Blue

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Acta Metallurgica Sinica(English Letters) 2016年第3期29卷 253-264页

作者： Harshad R.Patil Z.V.P.Murthy Department of Chemical Engineering S.V.National Institute of Technology R&D division Hazira Manufacturing DivisionReliance Industries Limited

Magnesium oxide（MgO） is one of the metal oxides having unique properties with numerous potential industrial *** this study,MgO and vanadium-doped MgO nanoparticles were synthesized by sol–gel method in 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM][BF_4] and 1-octyl-3-methylimidazolium tetrafluoroborate [OMIM][BF_4] ionic ***-doped MgO nanoparticles exhibited nanosphere and nanorod morphologies with 40–80 nm in particle size,primarily due to the influence of ionic liquids as demonstrated by high-resolution scanning electron microscopy and transmission electron *** of nanoparticles were also studied by thermal gravimetric analysis,X-ray diffraction and energy-dispersive X-ray *** ability of synthesized nanoparticles was evaluated for methylene blue（MB） in specially designed UV *** is found to be dependent on doping,and particle characteristics change due to the influence of ionic *** ionic liquid-assisted vanadium-doped MgO nanoparticles showed good reusability under UV irradiation and MB degradation ability under visible light.

关键词： Ionic liquid Vanadium pentoxide Magnesium oxide Sol–gel Photocatalytic activity

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A 10-bit low power SAR A/D converter based on 90 nm CMOS

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Journal of Semiconductors 2009年第10期30卷 100-107页

作者：佟星元杨银堂朱樟明肖艳陈剑鸣 Institute of microelectronics Xidian University IP-2 of D.S.division Semiconductor Manufacturing International Corporation

Traditional and some recently reported low power,high speed and high resolution approaches for SAR A/D converters are *** on SMIC 65 nm CMOS technology,two typical low power methods reported in previous works are validated by circuit design and *** challenges and considerations for high speed SAR A/D converters are ***,an R–C combination based method is also addressed and a 10-bit SAR A/D converter with this approach is implemented in SMIC 90 nm CMOS *** DNL and INL are measured to be less than 0.31 LSB and 0.59 LSB *** an input frequency of 420 kHz at 1 MS/s sampling rate, the SFDR and ENOB are measured to be 67.6 dB and 9.46 bits respectively,and the power dissipation is measured to be just 3.17 mW.

关键词： analog-to-digital converter R-C combination CMOS integrated circuits nonlinearity low power

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Effects of elastic-plastic properties of materials on residual indentation impressions in nano-indentation using sharp indenter

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中国有色金属学会会刊：英文版 2012年第S3期22卷 585-595页

作者： Jung-Min LEE Chan-Joo LEE Kyung-Hun LEE Byung-Min KIM Dongnam Regional division Korea Institute of Industrial Technology Precision manufacturing Systems division Pusan National University School of Mechanical Engineering Pusan National University

One of the primary features of nano-indentation technique is that the contact area induced by an indenter is indirectly measured by a relationship between the penetration depth and the known geometry of the ***,this indirect measurement occasionally leads to inaccurate properties of the indented *** objective of this study is to investigate the effects of E/σr and the strain hardening exponents n of materials on the behaviors of pile-up and sink-in in nano-indentation and to predict n values of materials from the residual indentation *** relations between the residual indentation profile and n value of the indented material were identified by dimensional ***,they were numerically formulated using FE analysis of nano-indentation for 140 different combinations of elastic-plastic parameters such as E,σy and *** parameters of hrp/hm,herp/hm,Rr/hm and HO&P/Hreal were introduced as various dimensionless parameters to represent and quantify the residual indentation profile after *** were subsequently characterized as dimensionless functions using n and E/σr ***,the validity of these functions was verified through 3D FE analysis of nano-indentation for Al 6061-T6 and AISI 1010 materials.

关键词： nano-indentation pile-up sink-in strain hardening exponent FE simulation

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High-order nonreciprocal add-drop filter

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Science China(Physics,Mechanics & Astronomy) 2021年第12期64卷 121-129页

作者： Hang Li Rui Ge YuChen Peng Bei Yan JianLan Xie JianJun Liu ShuangChun Wen Key Laboratory for micro/nano Optoelectronic Devices of Ministry of Education&Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China

Topological photonics have led to robust optical behavior of optical devices, which has alleviated the influence of manufacturing defects and perturbations on the device performance. Meanwhile, temporal coupled-mode theory(t-CMT) has been developed and applied widely. However, the t-CMT of cascaded coupled cavities(CCC) system and its corresponding high-order filter has yet to be established. Here, the t-CMT of CCC system is established based on the existing t-CMT. By combining the CCC with topological waveguides, a versatile design scheme of high-order nonreciprocal add-drop filter(HONAF) is proposed. The relationship between the coupling effect of cavities and transmission and the filtering performance of HONAF is analyzed quantitatively. Then, a method to improve the transmission efficiency and quality factor of the filter is given. The proposed HONAF is based on the combination of gyromagnetic photonic crystals and decagonal Penrose-type photonic quasicrystals. The transmission and filtering performance of the HONAF are numerically analyzed, which verifies the consistency between theoretical prediction and numerical simulation. The established t-CMT of CCC system can be widely used in coupled resonator optical waveguides and their related systems. The proposed HONAF with excellent performance can also be applied to wavelength division multiplexing/demultiplexing systems.

关键词： filter photonic crystals photonic quasicrystals temporal coupled-mode theory

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