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等离子体浸没离子注入圆筒内表面的时空尺度

核技术 2002年第9期25卷 709-713页

作者：田修波 d t k kwok 童洪辉 Paul k Chu 香港城市大学

等离子体浸没离子注入与工件外表面的注入不同 ,存在空间和时间上的尺度。研究结果表明 ,由于内腔 ,如内筒的有限尺寸 ,使注入电压的利用率降低 ,同时使内部等离子体快速耗尽 ,对于特定的内筒 ,利用提高注入电压从而提高注入能量只能在... 详细信息

等离子体浸没离子注入与工件外表面的注入不同 ,存在空间和时间上的尺度。研究结果表明 ,由于内腔 ,如内筒的有限尺寸 ,使注入电压的利用率降低 ,同时使内部等离子体快速耗尽 ,对于特定的内筒 ,利用提高注入电压从而提高注入能量只能在一定的电压范围内实现。在典型的外表面注入工艺条件下 ,内表面离子的耗尽速度是惊人的。如在对于直径 2 0cm的圆筒在 30kV、2× 10 15ions/cm3的条件下 ,等离子体耗尽时间仅为 0 .5 5 μs ,这个时间甚至小于多数脉冲电源的上升沿时间。结果表明 ,内部等离子体源的硬件结构可能是一种有效的解决方法。

关键词：时空尺度等离子体浸没离子注入尺度效应圆筒内表面表面改性

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等离子体浸没离子注入圆筒内表面的时空尺度

等离子体浸没离子注入圆筒内表面的时空尺度

Strategies in boosting photosensitization for biomedical applications

'2001全国荷电粒子源、粒子束学术会议

作者：田修波 d.t.k.kwok 童洪辉 Paul.k.Chu 香港城市大学物理及材料科学系香港城市大学物理及材料科学系香港城市大学物理及材料科学系香港城市大学物理及材料科学系

等离子体浸没离子注入是传统离子注入的一个新发展。与工件外表面的注入不同,内表面的等离子体浸没离子注入存在空间和时间上的尺度。本文围绕这一主题展开了讨论。研究表明,由于内腔,如内筒的有限尺寸,使得注入电压的利用率降低、同时... 详细信息

等离子体浸没离子注入是传统离子注入的一个新发展。与工件外表面的注入不同,内表面的等离子体浸没离子注入存在空间和时间上的尺度。本文围绕这一主题展开了讨论。研究表明,由于内腔,如内筒的有限尺寸,使得注入电压的利用率降低、同时使内部等离子体快速耗尽。对于特定的内筒,利用提高注入电压提高注入能量只能在一定的电压范围内实现。在典型的外表面注入工艺条件下,内表面离子的耗尽速度是惊人的。如在对于直径20cm的圆筒在30 kV、2×10ions/cm的条件下,等离子体耗尽时间仅为0.55μs,这个时间甚至小于多数脉冲电源的上升沿时间。内部等离子体源的硬件结构可能是一种有效的解决方法。

关键词：内表面等离子体浸没离子注入时间尺度空间尺度

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Science China Chemistry 2022年第4期65卷 647-649页

作者： Ming Chen Ryan t.k.kwok Youhong tang dan ding College of Chemistry and Materials Science Jinan UniversityGuangzhou 510632China Frontiers Science Center for Cell Responses State Key Laboratory of Medicinal Chemical BiologyKey Laboratory of Bioactive MaterialsMinistry of EducationCollege of Life SciencesNankai UniversityTianjin 300071China department of Nephrology Huai’an Hospital Affiliated to Xuzhou Medical College and Huai’an Second HospitalHuai’an 223002China department of Chemistry The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionInstitute for Advanced StudyDepartment of Chemical and Biological EngineeringThe Hong Kong University of Science and TechnologyHong KongChina Australia-China Joint Centre for Personal Health technologies Medical Device Research InstituteCollege of Science and EngineeringFlinders UniversitySouth Australia 5042Australia Guangdong Provincial key Laboratory of Luminescence from Molecular Aggregates South China University of TechnologyGuangzhou 510640China

Photodynamic therapy(Pdt)has emerged as an effective treatment method for its few adverse effects,little invasiveness,short treatment time and low cost[1,2].the rapid development of Pdt has dramatically boosted its mu... 详细信息

关键词： treatment boosting immunotherapy

Challenges in determination of microscopic degree of cleanliness in ultra-clean gear steels

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Journal of Iron and Steel Research International 2022年第10期29卷 1583-1600页

作者： d.Fuchs t.tobie k.Stahl Gear Research Center(FZG) Technical University of Munich85748 GarchingGermany

Shot-peened,case-hardened gears can fail in the tooth root due to crack initiation below the surface of the steel ***,the crack is initiated at a non-metallic inclusion in the center of a so-called *** failure type can lead to a reduced endurance fatigue limit of the *** is for this reason that,over the last decade,much effort has been invested by steel manufacturers to reduce the non-metallic inclusion content of gear steels so as to mitigate or even completely prevent such crack *** ultra-clean gear steels were achieved by various measures in the steel production ***,as a result,the remaining non-metallic inclusions are inhomogeneously distributed in the steel volume in terms of both size and ***,due to the inhomogeneity of ultra-clean steels,the question arose if the values derived according to the standards are still representative of ultra-clean steel *** results show that the standards can still be applied,but more effort must be *** determine the degree of cleanliness,six microsections are currently evaluated according to steel test specification(SEP)1571,method *** is shown that an examination of 24 microsections starting from size class 0 seems beneficial to get more reliable and comparable results of the degree of cleanliness of these ultra-clean gear *** addition,it is shown that a high degree of cleanliness has been achieved for all steel batches investigated with the measures taken in the steel production process.

关键词： degree of cleanliness Non-metallic inclusion Evaluation of inclusion SEP 1571 dIN 50602 Ultrasonic immersion testing Ultra-clean gear steel Gear

Mechanical Property Prediction of Commercially Pure titanium Welds with Artificial Neural Network

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Journal of Materials Science & technology 2005年第3期21卷 403-407页

作者： YanhongWEI k.k.d.H.Bhadeshia t.Sourmail StatekeyLaboratoryofAdvancedWeldingProductiontechnology HarbinInstituteofTechnologyHarbin150001China departmentofMaterialsScienceandMetallurgy UniversityofCambridgeCambridgeCB23QZUK

Factors that affect weld mechanical properties of commercially pure titanium have been investigated using artificial neural networks. Input data were obtained from mechanical testing of single-pass, autogenous welds, and neural network models were used to predict the ultimate tensile strength, yield strength, elongation, reduction of area, Vickers hardness and Rockwell B hardness. the results show that both oxygen and nitrogen have the most significant effects on the strength while hydrogen has the least effect over the range investigated. Predictions of the mechanical properties are shown and agree well with those obtained using the 'oxygen equivalent' (OE) equations.

关键词： Commercially pure titanium Artificial neural networks Mechanical properties Weld

Near resonance vibration isolation on a levered-dual response(LEdAR)Coulomb-damped system by differential preloads/offsets in linear springs

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Applied Mathematics and Mechanics(English Edition) 2024年第6期45卷 1033-1050页

作者： t.I.tOLUWALOJU C.k.tHEIN d.HALIM department of Mechanical Materials and Manufacturing EngineeringUniversity of Nottingham Ningbo ChinaNingbo 315100Zhejiang ProvinceChina Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute University of Nottingham Ningbo ChinaNingbo 315048Zhejiang ProvinceChina

the levered-dual response(LEdAR)Coulomb-damped system attains near resonant vibration isolation by differential preloads/offsets in linear *** takes the advantages of both the preloads/offsets in linear springs and the guiderail friction for realizing different levels of vibration *** isolation capacities are investigated on the strategies with both the horizontal and vertical guiderails,with the horizontal rail only,and without *** compressive preloads generally result in the consumption of most of the initial excitation energy so as to overcome the potential *** isolation onsets at the frequency ratio of 1∓0.095 on the left-hand side(LHS)and the right-hand side(RHS)of the lever are relative to the load plate *** observed near resonant isolation thus makes the LEdAR system a candidate for the isolation of the mechanical systems about resonance while opening a path for simultaneous harvesterisolation functions and passive functions at extreme frequencies.

关键词： lever ratio Coulomb damping preload tension/compression isolation band/depth offset potential

thermal stress relaxation in shot peened and laser peened nickel-based superalloy

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Journal of Materials Science & technology 2020年第24期59卷 100-106页

作者： k.S.Chin S.Idapalapati d.t.Ardi School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Advanced Remanufacturing and technology Centre 3 CleanTech LoopCleanTech Two#01/01Singapore 637143Singapore

the effects of cold work produced by peening processes in residual stress relaxation under elevated temperatures were *** types of peening processes namely shot peening and laser peening were used to generate different amount of cold work and residual stresses in the *** of residual stress induced by cold working were carried out using X-ray diffraction coupled with electrochemical polishing method to measure the variation of residual stress with *** stresses in shot peened samples were observed to relax more rapidly than that of laser peened ones when subjected to thermal *** data collected from the experimental investigation was then used to build a correlation function to model the effects of cold work on residual stress relaxation.A parameter describing cold work’s contribution to stress relaxation is introduced into the well-known Zener-WertAvrami(ZWA)*** model was validated against experimental measurements and showed good agreement in both shot peened and laser peened samples.

关键词： Residual stress Cold work Surface treatment Nickel-based superalloys

Numerical modelling of a low power non-transferred arc plasma reactor for methane conversion

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Plasma Science and technology 2019年第6期21卷 29-37页

作者： B I MIN d k dINH d H LEE t H kIM S CHOI Institute for Nuclear Science and technology Jeju National University 102 Jejudaehak-ro Jeju 63243Republic of Korea University of Science and technology(USt) 217 Gajeong-ro Yuseong-gu Daejeon 34113 Republic of Korea korea Institute of Machinery and Materials 156 Gajeongbuk-ro Yuseong-gu Daejeon 34103 Republic of Korea department of Nuclear and Energy Engineering Jeju National University 102 Jejudaehak-ro Jeju 63243Republic of Korea

thermal flow characteristics and the methane conversion reaction in a low power arc plasma reactor for efficient storage and transport of methane,which is the main component of shale gas,were *** temperature and velocity distributions were calculated according to the type of discharge gases and arc current level by a self-developed magnetohydrodynamics (MHd)code and a commercial ANSYS-FLUENt code;the transport of chemical species was analyzed as including the chemical reactions of methane *** simulated results were verified by the comparison of calculated and measured arc voltages with permissible low error as under 4%.three C2 hydrocarbon gases with ethane (C2H6),ethylene (C2H4),and acetylene (C2H2)were selected as the converted species of methane from experimental *** mass fraction of C2 hydrocarbons and hydrogen as the product of the conversion reaction at the reactor was also *** values show good agreement with the actual experimental results in that the major conversion reaction occurred in C2H2 and hydrogen,and the conversions to C2H6,C2H4,and hydrogen were minor reactions of methane pyrolysis conversion.

关键词： numerical modelling non-transferred arc plasma methane chemical reaction

Hydrodynamics of gas-solid fluidization of a homogeneous ternary mixture in a conical bed:Prediction of bed expansion and bed fluctuation ratios

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Particuology 2013年第6期11卷 681-688页

作者： d.t.k.dora S.R.Panda Y.k.Mohanty G.k.Roy department of Chemical Engineering Gandhi Institute of Engineering and Technology(GIET) department of Chemical Engineering National Institute of Technology(NIT)

Hydrodynamic characteristics of fluidization in a conical or tapered bed differ from those in a columnar bed because the superficial velocity in the bed varies in the axial direction. Fixed and fluidized regions could coexist and sharp variations in pressure drop could occur, thereby giving rise to a noticeable pressure drop-flow rate hysteresis loop under incipient fluidization conditions. to explore these unique properties, several experiments were carried out using homogeneous, well-mixed, ternary mixtures with three dif- ferent particle sizes at varying composition in gas-solid conical fluidized beds with varying cone angles. the hydrodynamic characteristics determined include the minimum fluidization velocity, bed fluctuation, and bed expansion ratios. the dependence of these quantities on average particle diameter, mass fraction of the fines in the mixture, initial static bed height, and cone angle is discussed. Based on dimensional analysis and factorial design, correlations are developed using the system parameters, i.e. geometry of the bed （cone angle）, particle diameter, initial static bed height, density of the solid, and superficial velocity of the fluidizing medium. Experimental values of minimum fluidization velocity, bed fluctuation, and bed expansion ratios were found to agree well with the developed correlations.

关键词： Gas-solid fluidization Conical bed Homogeneous ternary mixtures Bed fluctuation ratio Bed expansion ratio