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Acta Metallurgica Sinica(English Letters) 2003年第2期16卷 84-89页

作者： c.H.Jiang J.M.Yoo J.w.Ko G.w.Qiao Institute of Metal Research The Chinese Academy of SciencesShenyang 110016ChinaMaterials Engineering Dept.Korea Institute of Machinery&Materials66 Sangnam-DongChangwon641-010KoreaMaterials Engineering Dept.Korea Institute of Machinery&Materials66 Sangnam-DongChangwon641-010KoreaInstitute of Metal ResearchThe Chinese Academy of SciencesShenyang 110016China

The Bi-2223/Ag tapes were prepared with spray-died powders, which are of different particle sizes and phase assemblages by varying the annealing time in pure oxygen. Longer time annealing degraded the reactivity of precursor powder, which in turn resulted in an incomplete conversion from precursors to Bi-2223, porosity core and misaligned grains in fully processed tapes. The best Jc in short pressed samples varied from 29.7 to 47kA/cm2 for the tapes made from different powders.

关键词： Bi-2223/Ag tape precursor powder critical current density

Sol-gel derived HA/TiO_2 double coatings on Ti scaffolds for orthopaedic applications

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中国有色金属学会会刊：英文版 2006年第B01期16卷 209-216页

作者： XU w HU w Y LI M H MA Q Q P. D. HODGSON wEN c E Department of Applied Physics Hunan University Changsha 410082 China centre for Material and Fibre Innovation Deakin University Geelong Vic 3217 Australia

Hydroxyapatite/titania (HA/TiO2) double layers were coated onto Ti scaffolds throughout for orthopaedic applications by sol-gel method. Differential scanning calorimetry (DSc), thermogravimetric analysis (TG) and X-ray diffractometry (XRD) were used for the characterisation of the phase transformations of the dried gels and coated surface structures. Scanning electron microscope (SEM) equipped with energy dispersive spectrometry (EDS) was used for the observation and evaluation of the morphology and phases of the surface layers and for the assessment of the in vitro tests. The in vitro assessments were performed by soaking the HA/TiO2 double coated samples into the simulated body fluid (SBF) for various periods. The TiO2 dipping-coating method at a speed of 12 cm/min, followed by a heat treatment at 600 ℃ for 20 min. The HA la lyaeyre wr wasa ssu cbosaetqeude bnytl ya dipping-coated on the outer surface at the same speed and then heat-treated at difference temperatures. The results indicat that the HA phase begins to crystallize after a heat treatment at 560 ℃. The crystallinity increases obviously at 760 ℃. SEM observations find no delamination or crack at the interfaces of HA/TiO2 and TiO2/Ti. The HA/TiO2 coated Ti scaffolds displays excellent bone-like apatite forming ability when it is soaked into SBF. Ti scaffolds after HA/TiO2 double coatings can be anticipated as promising implant materials for orthopaedic

关键词：钛支架溶胶-凝胶法羟基磷灰石/二氧化钛涂层医学整形外科应用

Dispersion Tuning of a SOA Fiber Laser Incorporating a Linearly chirped Fiber Grating

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光学学报 2003年第S1期23卷 435-436页

作者： w. w. Tang c. Shu Department of Electronic Engineering The Chinese University of Hong Kong Shatin N.T. Hong Kong PRC.Department of Electronic Engineering The Chinese University of Hong Kong Shatin N.T. Hong Kong PRC.

-we describe a simple method to generate wavelength-tunable pulses by using a semiconductor optical amplifier (SOA) as an intensity modulator and a gain medium. wavelength tunable pulses at a repetition rate of 4.8 GH... 详细信息

关键词： SOA in be as of Dispersion Tuning of a SOA Fiber Laser Incorporating a Linearly chirped Fiber Grating

Dibaryon Signals in NN Scattering Data and Further Measurement at cOSY,LEPS and cSR

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原子核物理评论 2009年第S1期26卷 137-141页

作者： c. w. wong Department of Physics and Astronomy University of California

The NΔ and ΔΔ dibaryon resonances are studied by calculating the NN scattering phase shifts with explicitly coupling these dibaryon channels in a multi-channel coupling calculation with two quark models. These quark models,the chiral quark model and quark delocalization color screening model,describe the NN S-,D-wave phase shifts below the π production threshold quantitatively well. Both quark models predict the 1D2 resonance discovered in NN partial wave phase shift analysis and the J=1 or 3 isoscalar resonance recently reported by cELSIUS-wASA collaboration are NΔ5S2 and ΔΔ7S3 resonance,respectively. Further measurements at cOSY,LEPS and Lanzhou cooling Storage Ring(cSR) to check the ΔΔ resonance are discussed.

关键词： nucleon-nucleon scattering dibaryon quark model

Finite Element Simulation on Thermal Fatigue of a Turbine Blade with Thermal Barrier coatings

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Journal of Materials Science & Technology 2014年第4期30卷 371-380页

作者： L.Yang Q.X.Liu Y.c.Zhou w.G.Mao c.Lu Key Laboratory of Low Dimensional Materials & Application Technology(Ministry of Education) Xiangtan University Faculty of Materials Optoelectronic & PhysicsXiangtan University Department of Mechanical Engineering Curtin University

In this paper, a finite element model was developed for a turbine blade with thermal barrier coatings to investigate its failure behavior under cyclic thermal loading. Based on temperature and stress fields obtained from finite element simulations, dangerous regions in ceramic coating were determined in terms of the maximum principal stress criterion. The results show that damage preferentially occurs in the chamfer and rabbet of a turbine blade with thermal barrier coatings and its thermal fatigue life decreases with the increase of thermal stress induced by high service temperature.

关键词： Turbine blade Thermal barrier coatings Finite element model Thermal fatigue Life prediction

Vascular resections in minimally invasive surgery for pancreatic cancer

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Laparoscopic, Endoscopic and Robotic Surgery 2022年第1期5卷 3-9页

作者： Janet w.c.Kung Rowan w.Parks Division of HBP Surgery Prince of Wales HospitalShatinHong KongChina Department of Surgery The Chinese University of Hong KongHong KongChina HPB Surgery Royal Infirmary of EdinburghEdinburghUnited Kingdom Department of clinical Surgery University of EdinburghEdinburghUnited Kingdom

Pancreatic ductal adenocarcinoma(PDAc)is characterised by poor oncological outcome and is the seventh cause of cancer-related deaths *** the advances in surgical technology,oncological treatment,and critical care,extended pancreatic resections including vascular resections have become more frequently performed in specialised ***,the boundaries of resectability continue to be pushed in order to achieve a potentially curative approach in selected patients in combination with neoadjuvant and adjuvant treatment *** review gives an overview on the current state of venous and arterial resections in PDAc surgery with particular attention given to the minimally invasive approach.

关键词： Pancreatic adenocarcinoma Minimally invasive surgery Extended pancreatic resection Vascular resection Vascular reconstruction Neoadjuvant therapy

Numerical Simulation of Free Surface by an Area-Preserving Level Set Method

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communications in computational Physics 2012年第4期11卷 1347-1371页

作者： Tony w.H.Sheu c.H.Yu Department of Engineering Science and Ocean Engineering National Taiwan UniversityNo.1Sec.4Roosevelt RoadTaipeiTaiwan Taida Institute of Mathematical Sciences(TIMS) National Taiwan University center for Quantum Science and Engineering(cQSE) National Taiwan University

we apply in this study an area preserving level set method to simulate gas/water interface *** the sake of accuracy,the spatial derivative terms in the equations of motion for an incompressible fluid flow are approximated by the fifthorder accurate upwinding combined compact difference(UccD)*** scheme development employs two coupled equations to calculate the first-and second-order derivative terms in the momentum *** accurately predicting the level set value,the interface tracking scheme is also developed to minimize phase error of the first-order derivative term shown in the pure advection *** the purpose of retaining the long-term accurate Hamiltonian in the advection equation for the level set function,the time derivative term is discretized by the sixth-order accurate symplectic Runge-Kutta ***,to keep as a distance function for ensuring the front having a finite thickness for all time,the re-initialization equation is *** the verification of the optimized UccD scheme for the pure advection equation,two benchmark problems have been chosen to investigate in this *** level set method with excellent area conservation property proposed for capturing the interface in incompressible fluid flows is also verified by solving the dam-break,Rayleigh-Taylor instability,two-bubble rising in water,and droplet falling problems.

关键词： Level set method phase error upwinding combined compact scheme Hamiltonian symplectic Runge-Kutta area conservation property

Advances in nutritional therapy in inflammatory boweldiseases:Review

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world Journal of Gastroenterology 2016年第3期22卷 1045-1066页

作者： Andrzej wędrychowicz Andrzej Zając Przemysław Tomasik Department of Pediatrics Gastroenterology and NutritionPolish-American Children’s HospitalJagiellonian University Medical College30663 KrakowPoland Department of Pediatric Surgery Polish-American Children’s HospitalJagiellonian University Medical College30663 KrakowPoland Department of clinical Biochemistry Polish-American Children’s HospitalJagiellonian University Medical College30663 KrakowPoland

Inflammatory bowel diseases(IBD), including ulcerative colitis and crohn's disease are chronic, life-long, and relapsing diseases of the gastrointestinal tract. currently, there are no complete cure possibilities, but combined pharmacological and nutritional therapy may induce remission of the disease. Malnutrition and specific nutritional deficiencies are frequent among IBD patients, so the majority of them need nutritional treatment, which not only improves the state of nutrition of the patients but has strong anti-inflammatory activity as well. Moreover, some nutrients, from early stages of life are suspected as triggering factors in the etiopathogenesis of IBD. Both parenteral and enteral nutrition is used in IBD therapy, but their practical utility in different populations and in different countries is not clearly established, and there are sometimes conflicting theories concerning the role of nutrition in IBD. This review presents the actual data from research studies on the influence of nutrition on the etiopathogenesis of IBD and the latest findings regarding its mechanisms of action. The use of both parenteral and enteral nutrition as therapeutic methods in induction and maintenance therapy in IBD treatment is also extensively discussed. comparison of the latest research data, scientific theories concerning the role of nutrition in IBD, and different opinions about them are also presented and discussed. Additionally, some potential future perspectives for nutritional therapy are highlighted.

关键词： Dietary factors Etiology Nutritionaltherapy Parenteral nutrition Exclusive enteral nutrition Induction therapy Maintenance therapy Inflammatorybowel disease

conformable fractional heat equation with fractional translation symmetry in both time and space

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chinese Physics B 2023年第4期32卷 125-129页

作者： w S chung A Gungor J Krız B c Lutfuoglu H Hassanabadi Department of Physics and Research Institute of Natural Science College of Natural ScienceGyeongsang National UniversityJinju 660-701Korea Mechanical Engineering Akdeniz UniversityAntalyaTurkey Department of Physics University of Hradec KraloveRokitanskeho 6250003 Hradec KraloveCzech Republic Department of Physics Akdeniz UniversityAntalyaTurkey Faculty of Physics Shahrood University of TechnologyShahroodIran

we investigate the fractional heat equation with fractional translation in both time and position with different fractional *** examples,we consider a rod and anα-disk with an initial constant temperature and discuss... 详细信息

关键词： fractional derivative heat equation conformable symmetry

Influence of wall slip on the hydrodynamic behavior of a two-dimensional slider bearing

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Acta Mechanica Sinica 2007年第6期23卷 655-661页

作者： G. J. Ma c. w. wu P. Zhou State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering Mechanics Dalian University of Technology Dalian 116024 China

In the present paper, a multi-linearity method is used to address the nonlinear slip control equation for the hydrodynamic analysis of a two-dimensional （2-D） slip gap flow. Numerical analysis of a finite length slider bearing with wall slip shows that the surface limiting shear stress exerts complicated influences on the hydrodynamic behavior of the gap flow. If the slip occurs at either the stationary surface or the moving surface （especially at the stationary surface）, there is a transition point in the initial limiting shear stress for the proportional coefficient to affect the hydrodynamic load support in two opposite ways： it increases the hydrodynamic load support at higher initial limiting shear stresses, but decreases the hydrodynamic load support at lower initial limiting shear stresses. If the slip occurs at the moving surface only, no fluid pressure is generated in the case of null initial limiting shear stress. If the slip occurs at both the surfaces with the same slip property, the hydrodynamic load support goes off after a critical sliding speed is reached. A small initial limiting shear stress and a small proportionality coefficient always give rise to a low friction drag.

关键词： wall slip Slider beating Multi-linearity method Quadratic programming