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Nanofillers modification of Epocast 50-A1/946 epoxy for bonded joints

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Chinese journal of Aeronautics 2014年第5期27卷 1288-1300页

作者： u.A.Khashaba A.A.Aljinaidi M.A.Hamed Department of Mechanical Engineering Faculty of Engineering King Abdulaziz University

Epocast 50-A1/946 epoxy was primarily developed for joining and repairing of composite aircraft structural components. The objective of the present work is to modify the Epocast epoxy resin by different nanofillers infusion. The used nanofillers include multi-walled carbon nanotubes（MWCNTs）, SiC and Al2O3 nanoparticles. The nanofillers with different weight percentages are ultrasonically dispersed in the epoxy resin. The sonication time and amplitude for MWCNTs are reduced compared to Al2O3 and SiC nanoparticles to avoid the damage of MWCNTs during sonication processes. The fabricated neat epoxy and twelve nanocomposite panels were characterized via standard tension and in-plane shear tests. The experimental results show that the nanocomposites materials with 0.5wt% MWCNTs, 1.5wt% SiC and 1.5wt% Al2O3 nanoparticles have the highest improvement in the tensile properties compared to the other nanofiller loading *** improvements in the shear properties of these nanocomposite materials were respectively equal to 5.5%, 4.9%, and 6.3% for shear strengths, and 10.3%, 16.0%, and 8.1% for shear moduli. The optimum nanofiller loading percentages will be used in the following papers concerning their effect on the bonded joints/repairs of carbon fiber reinforced composites.

关键词： Iosipescu shear tests Nanocomposites Optimum nanofiller weight percentage Scanning electron microscopic Tension tests ultrasonic

FREEZE/THAW PERFORMANCE OF CONCRETE uSINg gRANuLATED RuBBER CRuMB

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journal of green Building 2011年第1期6卷 83-92页

作者： A.Richardson K.Coventry u.Dave j.Pienaar Northumbria university Newcastle upon TyneUK Nirma university India

This paper evaluates the properties and use of recycled rubber tyres in the form of rubber crumb as a freeze/thaw protection agent when used in *** scrap tyres in the form of rubber crumb in concrete could benefit the environment by contributing to the percentage of tyres used for a variety of recycling processes such as carpet underlay or tyre derived fuel,thus reducing disposal of tyres to landfill sites and the chemical usage of air entraining agents as a means of achieving freeze/thaw *** cubes of 100mm were produced from design mixes which have been classified as plain,air entrained and rubber crumb and subjected to freeze/thaw cycles at 5 days of *** was conducted in water to ensure full saturation of pores and maximum stress on the concrete *** rubber crumb and plain concrete mixes were compared against the freeze/thaw performance of that entrained with *** entrainment is known to protect against freeze/thaw *** crumb when used at a 0.5%addition by volume provided the optimum freeze/thaw protection whilst maintaining the maximum compressive *** research shows that rubber crumb was effective at providing freeze/thaw protection albeit with a reduced compressive strength when compared to air entrained *** practical constraints of the test program were time and freezer space so the test was limited to 50 freeze/thaw cycles,which was sufficient for conclusions to be *** paper contributes to the understanding of the effects of varying doses of rubber crumb in concrete when used as a freeze/thaw protection *** final compressive strength of the concrete mixes tested at freeze/thaw and non freeze/thaw conditions are *** compaction of concrete is raised as an area of concern with regard to rubber particle separation within the plastic phase of the concrete’s life.

关键词： rubber crumb concrete freeze/thaw protection sustainability recycled tyres

Electrical control of quantum emitters in a Van der Waals heterostructure

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Light(Science & Applications) 2022年第8期11卷 1790-1798页

作者： Simon j.u.White Tieshan Yang Nikolai Dontschuk Chi Li Zai-Quan Xu Mehran Kianinia Alastair Stacey Milos Toth Igor Aharonovich School of Mathematical and Physical Sciences University of Technology SydneyUltimoNSW2007Australia ARC Centre of Excellence for Transformative Meta-Optical Systems University of Technology SydneyUltimoNSW2007Australia School of Physics University of MelbourneParkvilleVIC3010Australia School of Science RMIT UniversityMelbourneVIC3001Australia

Controlling and manipulating individual quantum systems in solids underpins the growing interest in the development of scalable quantum ***,hexagonal boron nitride(hBN)has garnered significant attention in quantum photonic applications due to its ability to host optically stable quantum ***,the large bandgap of hBN and the lack of efficient doping inhibits electrical triggering and limits opportunities to study the electrical control of ***,we show an approach to electrically modulate quantum emitters in an hBN-graphene van der Waals *** show that quantum emitters in hBN can be reversibly activated and modulated by applying a bias across the ***,a significant number of quantum emitters are intrinsically dark and become optically active at non-zero *** explain the results,we provide a heuristic electrostatic model of this unique ***,employing these devices we demonstrate a nearly-coherent source with linewidths of~160 *** results enhance the potential of hBN for tunable solid-state quantum emitters for the growing field of quantum information science.

关键词： quantum hexagonal boron

Turbulent flow simulation of a single-blade Magnus rotor

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Advances in Aerodynamics 2021年第1期3卷 316-337页

作者： X.Bai C.ji P.grant N.Phillips u.Oza E.j.Avital j.j.R.Williams School of Engineering and Materials Science Queen Mary University of LondonMile End RoadLondon E14NSUK Siemens Ltd. ChinaTechnologyBeijing 100102China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China grant Applied Sciences 3rd Floor3 Fitzhardinge StreetLondon W1H 6EUK.

This paper presents numerical studies of the Magnus effect for a kinetic turbine on a horizontal *** focus on the Magnus blade,a single self-spinning cylindrical blade is *** iterative direct-forcing immersed boundary method is employed within the Eulerian-Lagrangian framework due to its capability to treat complex and moving *** Eulerian fluid domain is discretized using the finite volume method while the Magnus rotor is represented by a set of discrete points/*** aim of the numerical studies is to provide insights for the design process and predict aerodynamic performances under various operating *** for stationary and self-spinning cylinders in turbulent flows are found to be in good agreement with published *** increasing the aspect ratio of the cylinder(simulated segment length over its diameter)from 3 to 10,a 30%drop in lift coefficient and a 22%increase in drag coefficient were observed,which is believed to be attributed to an enhancement of the three-dimensionality of the *** the Magnus rotor,key parameters such as dynamic forcing and frequency,distribution of pressure coefficient and torque have been produced for two cases with different structural designs and working *** increase of the aspect ratio from 3 to 10,stable forces are observed from the root side of the blade and the torque coefficient increases from 0.68 to 2.1,which indicates a superior performance in terms of power extraction.

关键词： Immersed boundary method Large eddy simulation Magnus effect Spinning cylinder

Ion-acoustic wave structures in the fluid ions modeled by higher dimensional generalized Korteweg-de Vries-Zakharov-Kuznetsov equation

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journal of Ocean Engineering and Science 2023年第6期8卷 623-635页

作者： u.Younas j.Ren Muhammad Z.Baber Muhammad W.Yasin T.Shahzad State Key Laboratory of Power grid Environmental Protection/Henan Academy of Big Data Zhengzhou UniversityZhengzhou 450001China Department of Mathematics and Statistics The University of LahoreLahorePakistan Department of mathematics University of NarowalNarowalPakistn Department of Basic Sciences and Humanities Narowal CampusUniversity of Engineering and Technology Lahore 54890Pakistan

In this paper,the higher dimensional generalized Korteweg-de-Varies-Zakharov-Kuznetsov(gKdV-ZK)equation is under *** model is used in the field of plasma physics which describes the effects of magnetic field on the weak ion-acoustic *** have applied two techniques,called asφ^(6)-model expansion method and the Hirota bilinear method(HBM)to explore the diversity of wave *** solutions are expressed in the form of hyperbolic,periodic and jacobi elliptic function(jEF)***,the solitary wave solutions are also extracted.A comparison of our results to well-known results is made,and the study concludes that the solutions achieved here are ***,3-dimensional and contour profiles of achieved outcomes are drawn in order to study their dynamics as a function of parameter *** the basis of the obtained results,we can assert that the pro-posed computational methods are straightforward,dynamic,and well-organized,and will be useful for solving more complicated nonlinear problems in a variety of fields,particularly in nonlinear sciences,in conjunction with symbolic ***,our discoveries provide an important milestone in comprehending the structure and physical behavior of complex *** hope that our findings will contribute significantly to our understanding of ocean *** study,we hope,is appropriate and will be of significance to a broad range of experts involved in ocean engineering models.

关键词： Wave solutions gKdV-ZK equation Bilinear transformation φ^(6)-model expansion method

Chronic intestinal failure and short bowel syndrome in Crohn’s disease

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World journal of gastroenterology 2021年第24期27卷 3440-3465页

作者： Aysegül Aksan Karima Farrag Irina Blumenstein Oliver Schröder Axel u Dignass jürgen Stein Institute of Nutritional Sciences Justus-Liebig-UniversitätGiessen 35392Germany Department of Clinical Research Interdisziplinäres Crohn Colitis Centrum Rhein-MainFrankfurt am Main 60594Germany Department of gastroenterology and Clinical Nutrition DGD Kliniken SachsenhausenTeaching Hospital of the JW Goethe UniversityFrankfurt am Main 60594Germany Department of gastroenterology Hepatology and Clinical NutritionFirst Medical ClinicJW Goethe University HospitalFrankfurt am Main 60529Germany Department of MedicineⅠ Agaplesion Markus HospitalGoethe-UniversityFrankfurt am Main 60431Germany Institute of Pharmaceutical Chemistry JW Goethe University60438 Frankfurt am MainGermany

Chronic intestinal failure(CIF)is a rare but feared complication of Crohn’s *** on the remaining length of the small intestine,the affected intestinal segment,and the residual bowel function,CIF can result in a wide spectrum of symptoms,from single micronutrient malabsorption to complete intestinal *** of CIF has improved significantly in recent *** in home-based parenteral nutrition,in particular,have translated into increased survival and improved quality of ***,60%of patients are permanently reliant on parenteral *** results with new drugs such as teduglutide have added a new dimension to CIF *** outcomes of patients with CIF could be greatly improved by more effective prevention,understanding,and *** complex cases,the care of patients with CIF requires a multidisciplinary approach involving not only physicians but also dietitians and nurses to provide optimal intestinal rehabilitation,nutritional support,and an improved quality of ***,we summarize current literature on CIF and short bowel syndrome,encompassing epidemiology,pathophysiology,and advances in surgical and medical management,and elucidate advances in the understanding and therapy of CIF-related complications such as catheter-related bloodstream infections and intestinal failure-associated liver disease.

关键词： Chronic intestinal failure Short bowel syndrome Crohn's disease Inflammatory bowel disease Parenteral nutrition Intestinal failure-associated liver disease

A strong and ductile NiCoCr-based medium-entropy alloy strengthened by coherent nanoparticles with superb thermal-stability

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journal of Materials Science & Technology 2023年第1期132卷 201-212页

作者： D.D.Zhang j.Kuang H.Xue j.Y.Zhang g.Liu j.Sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China

In this work,we designed a novel NiCoCr-based medium-entropy alloy(MEA)strengthened by coher-ent L12-nanoparticles,i.e.,(NiCoCr)92 Al 6 Ta 2(at.%).The strengthening and deformation mechanisms of the material and the coarsening kinetics of the coherent precipitates were systematically *** results indicated that giant precipitation hardening and its synergy with other strengthening contributors confer on the aged material a yield strength as high as 1.0 ***,a unique particle-features-dependent plasticity mechanism was revealed in this *** is,the alloy with a lower volume frac-tion,denser distribution,and finer particles mainly deformed by dislocation planar slip,otherwise,stack-faults-mediated plasticity was favored,rationalized by the cooperative/competitive effect of stack-fault energy,spatial confinement,and applied ***,the coarsening behavior of precipitate fol-lowed a modified Lifshitz-Slyozov-Wagner(LSW)model,and the nanoparticles displayed remarkably su-perior thermal stability compared to most traditional superalloys and reported multicomponent *** superb coarsening resistance of precipitate originated from the coupled effect of intrinsic sluggish diffusion in multi-principal alloys and the dual-roles of Ta species as a precipitate *** work provides a new pathway to develop strong-yet-ductile multicomponent alloys as promising candidates for high-temperature applications.

关键词： Medium-entropy alloy Mechanical properties Precipitation hardening Deformation mechanisms Coarsening kinetics

Biliary-colonic fistula caused by cholecystectomy bile duct injury

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Hepatobiliary & Pancreatic Diseases International 2013年第4期12卷 443-445页

作者： Francisco Igor B Macedo Victor j Casillas james S Davis joe u Levi Danny Sleeman Dewitt Daughtry Family Department of Surgery University of Miami Miller School of Medicine and Ryder Trauma Center/Jackson Memorial HospitalMiami Florida USA Department of Radiology University of Miami Miller School of Medicine and Ryder Trauma Center/Jackson Memorial HospitalMiami Florida USA

Biliary-colonic fistula is a rare complication after laparoscopic cholecystectomy. We present a case of post-cholecystectomy iatrogenic biliary injury that resulted in a fistula between the common hepatic duct and large bowel. Magnetic resonance cholangiopancreatography provided good visualization of injury even with concurrent normal level of alkaline phosphatase. Radiologic findings and surgical management of this condition are discussed in detail.

关键词： cholecystectomy magnetic resonance imaging biliary tract disease

Dissolution behavior of bioactive glass ceramics with different CaO/MgO ratios in SBF-K9 and r-SBF

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Progress in Natural Science:Materials International 2014年第4期24卷 354-363页

作者： M.u.Hashmi Saqlain A.Shah Department of Applied Sciences Superior University Lahore 2. Department of PhysicsFC College (A Chartered University) Department of Material Science and Engineering Washington University

In the present work,we studied dissolution behavior of three glass ceramics samples each having 34 SiO2–14.5 P2O5–1 CaF2–0.5 MgF2(%wt)and ratio of CaO/MgO varying from 11.5:1 to 1:11.5 in conventional SBF(SBF-K9) and revised SBF(r-SBF) that has ionic concentration exactly equal to that of human blood *** that purpose,samples were immersed in fluids for different time periods upto 25 *** film XRD analysis revealed the diffusive nature of the phases on the surfaces of samples after soaking for different time periods in *** showed the poor precipitation and small thickness of the HCAp layer on the samples as compared to that in SBF-K9,thus indicating the fitness and sensitivity of r-SBF for in-vitro characterization of ***,FTIR and EDS revealed slow bonding rate on the surfaces of the samples in r-SBF than that in SBF-K9 that showed the dependence of bond formation on the composition of the materials as well as on the physiological fluid used for in-vitro *** rate of HCAp formation was slower in r-SBF due to more competitive adsorption of CO3 ions to Ca and Mg ions owing to greater amount of CO3 in r-SBF than that in *** shows the importance of CO3 content in the physiological fluids for the in-vitro assessment of ***,r-SBF is recommended to be used for assessment of samples to clearly understand their behavior in-vivo.

关键词： Dissolution behavior SBF-K9 r-SBF