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2014 MRS Spring Meeting

作者： Rivera, Miguel A. Santiago Albino, Gina M. Montes Pérez, Oscar Perales Dept. of Physics University of Puerto Rico Mayagüez00681-9000 Puerto Rico Mechanical Engineering Department University of Puerto Rico Mayagüez00681-9000 Puerto Rico Engineering Science and Materials Department University of Puerto Rico Mayagüez00681-9000 Puerto Rico

ISBN: (纸本)9781605116525

The effective incorporation of dopant species into ZnO host structure should induce changes in its physical and chemical properties enabling the establishment of novel multi-functional properties. Doping with transition metal ions and the subsequent exchange interaction between available spins of the magnetic species are expected to induce a ferromagnetic behavior. This ferromagnetic functionality will enable the application of this material in data storage and spintronics-based devices. The present research addresses the study of the effect of the oxidation state of Fe species and the influence of the annealing atmosphere on the structural and functional properties of nanocrystalline ZnO-based powders. © 2014 materials Research Society.

关键词： Zinc oxide

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Probing the Structure and mechanical Properties of Individual MgAl2O4 Porous Agglomerates and Their Effects on Densification

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Microscopy and Microanalysis 2014年第S3期20卷 1450-1451页

作者： Jorgen F. Rufner Troy B. Holland Ricardo H.R. Castro Klaus van Benthem Dept. of Chemical Engineering and Materials Science University of California Davis CA 95616 Neat ORU University of California Davis CA 95616 Dept. of Mechanical Engineering Colorado State University Fort Collins CO 80523

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Tribological wear analysis of laser surface treated Ti6Al4V based on volume lost evaluation

Tribological wear analysis of laser surface treated Ti6Al4V ...

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5th International Conference of Manufacturing engineering Society, MESIC 2013

作者： Vázquez-Martínez, J.M. Salguero, J. Botana, F.J. Gómez-Parra, A. Fernandez-Vidal, S.R. Marcos, M. Mechanical and Industrial Design Dept. University of Cádiz C/ Chile s/n E-11002 Cádiz Spain Industrial Engineering and Civil Engineering Dept. University of Cádiz Avd. Ramón Puyol s/n E-11202 Algeciras Cádiz Spain Materials Science and Inorganic Chemistry Dept. University of Cádiz CASEM Avd. Rep. Saharaui s/n E-11510 Puerto Real Cádiz Spain

ISBN: (纸本)9783038351269

Surface modification of materials through thermal or chemical treatments and coatings development can be used to obtain improved behavior under abrasive and adhesive wear. A great variety of surface structures with different properties can be adapted to the most demanding requirements. This is due to the high number of parameters that can be controlled in each treatment, such as the technique used, the atmosphere, the use of additive elements to the base material, the thickness of the modified layers, etc., In order to monitoring more accurately the wear conditions on the alloy, tribological tests were carried out that enable to control anytime the application parameters of a process, thus generating very accurate, reliable and easier to evaluate data, than industrial machining processes. One of the most significant wear variables in the study is the change in volume of material experienced by the sample after the sliding process. This contribution aims at assessing the volume of worn material, analyzing the tribological behavior of surface treated by laser Ti6Al4V samples. © (2014) Trans Tech Publications, Switzerland.

关键词： Titanium alloys

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Reliability of sheet moulding composites (SMC) for the automotive industry

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AIP Conference Proceedings 2014年第1期1599卷 338-341页

作者： Giuseppe Lamanna Angelo Ceparano Luciana Sartore Materials Engineering and Science Lab - Dept. of Industrial and Information Engineering Second University of Naples SUN Via Roma 29 - 81031 Aversa Italy Department of Mechanical and Industrial Engineering Via Valotti 9 - 25123 Brescia Italy

The reliability of Sheet Moulding Composite (SMC) has been analysed by means of mechanical static and fatigue tests. SMCs showed substantial in-plane anisotropy either in terms of stiffness or strength reflecting the preferential orientation of the short fibres along the direction of the conveyor belt during the processing operations. The static data were modelled on a statistical basis assuming that the monotonic tensile strength follows a two-parameter Weibull distribution, while for the fatigue test we adopted a two parameters model already validated for Glass Fibre Reinforced Plastics (GFRP). Overall, the procedure indicated that he material reliability and its applicability limits can be achieved with a minimum of experimental tests.

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Corrigendum to “Preparation and characterization of vertically arrayed hydroxyapatite nanoplates on electrospun nanofibers for bone tissue engineering” [Chem. Eng. J. (2014) 612–622]

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Chemical engineering Journal 2015年 264卷 972-972页

作者： Abdalla Abdal-hay Pablo Vanegas Abdel Salam Hamdy Felix B. Engel Ju Hyun Lim Dept. of Bionano System Engineering College of Engineering Chonbuk National University Jeonju 561-756 Republic of Korea Dept. of Computer Science Faculty of Engineering Universidad de Cuenca 01.01.168 Ecuador Dept. of Engineering Materials and Mechanical Design Faculty of Engineering South Valley of University Qena 83523 Egypt Dept. of Manufacturing Engineering College of Engineering and Computer Science University of Texas Pan-American 1201 West University Dr. Edinburg TX 78541-2999 USA Universität Erlangen-Nürnberg Experimental Renal and Cardiovascular Research Department of Nephrology Institute of Pathology 91054 Erlangen Germany Dept. of Urology Gangneung Asan Hospital University of Ulsan College of Medicine Gangneung Republic of Korea

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Light Emission from Atomic Monolayers in a One-Dimensional Microcavity

Light Emission from Atomic Monolayers in a One-Dimensional M...

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LEOS Summer Topical Meetings

作者： Xiaoze Liu Tal Galfsky Vinod M. Menon Yi-Hsien Lee Fengnian Xia Ashwin Ramasubramaniam Dept. of Physics Queens College New York United States Dept. of Electrical Engineering Yale University New Haven Connecticut United States Dept. of Materials Science and Engineering National Tsing Hua University Hsinchu Taiwan Dept. of Mechanical and Industrial Engineering University of Massachusetts University of Massachusetts Amherst Massachusetts United States

We demonstrate one-dimensional dielectric micro cavity embedded with a monolayer of molybdenum disulfide. Enhanced directionality in light emission due to the interaction of micro cavity photons with the two-dimension... 详细信息

关键词： Excitons Microcavities Cavity resonators Educational institutions Reflectivity Image color analysis Dispersion

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Selective damage sensing in glass fiber/carbon nanotubes/vinyl ester smart composites by means of electrical resistance 29

Selective damage sensing in glass fiber/carbon nanotubes/vin...

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29th Annual Technical Conference of the American Society for Composites, ASC 2014;16th US-Japan Conference on Composite materials;ASTM-D30 Meeting

作者： De Ku-Herrera, José Jesús Avilés, Francis May-Pat, Alejandro Saponara, Valeria La De Castro, Ricardo Hauch Ribeiro Pinto, Brian Unidad de Materiales Centro de Investigación Científica de Yucatán Calle 43 No 130. Chuburna de Hidalgo Mérida Yucatán Mexico CP97200 Mexico Dept. of Mechanical and Aerospace Engineering University of California Davis One Shields Ave DavisCA95616 United States Dept. of Materials Science and Chemical Engineering University of California Davis One Shields Ave DavisCA95616 United States

ISBN: (纸本)9781605951249

The development of carbon nanotube/glass fiber/vinyl ester hierarchical composites containing a tailored electrically conductive carbon nanotube network is reported. Using the change in electrical resistance of this conductive network, research progress on sensing of mechanical damage occurring at the matrix, fiber or fiber/matrix interface is reported. The hierarchical composites are fabricated following two architectures where the location of multiwall carbon nanotubes (MWCNTs) changes within the composite. In those two architectures, the MWCNTs are i) randomly dispersed within the polymer matrix, or ii) deposited onto the glass fibers before the composite manufacturing. The former architecture is achieved by dispersing the MWCNTs within the polymer matrix, while in the latter composite architecture, MWCNTs are deposited onto the glass fibers beforehand. The MWCNTs are deposited onto the glass fibers following a dipping procedure assisted by ultrasonic dispersion of MWCNTs in water. The distribution of the MWCNTs onto the glass fibers is characterized by electron and atomic force microscopies, finding a homogeneous distribution with high density of MWCNTs onto the fibers. A considerable increase in the fiber roughness is found after MWCNT deposition. The electrical resistance of 1 mm long individual glass fibers covered with MWCNTs is in the order of Mω;, and the initial electrical resistance of 10 cm long 0° unidirectional tensile specimens manufactured with such fibers is in the order of kω;. The electromechanical characterization of the unidirectional glass fibers with deposited MWCNTs under a quasi-static tension loading indicates that the hierarchical composite has the capability to self-sense its own elastic strain and fiber breakage, until complete failure.

关键词： Glass fibers

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Three-dimensional multirobot formation control for target enclosing

Three-dimensional multirobot formation control for target en...

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2014 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Miguel Aranda Gonzalo López-Nicolás Carlos Sagüés Michael M. Zavlanos Instituto de Investigación en Ingeniería de Aragón Universidad de Zaragoza Spain Dept. of Mechanical Engineering and Materials Science Duke University Durham NC

This paper presents a novel method that enables a team of aerial robots to enclose a target in 3D space by attaining a desired geometric formation around it. We propose an approach in which each robot obtains its motion commands using measurements of the relative position of the other agents and of the target, without the need for a central coordinator. As contribution, our method permits any desired 3D target enclosing configuration to be defined, in contrast with the planar circular patterns commonly encountered in the literature. The proposed control strategy relies on the minimization of a cost function that captures the collective motion objective. In our method, the robots do not need to use a common reference frame. This coordinate independence is achieved through the introduction in the cost function of a rotation matrix computed locally by each robot. We prove that our motion controller is exponentially stable, and illustrate its performance through simulations.

关键词： Robot kinematics Robot sensing systems Collision avoidance Three-dimensional displays Vectors Position measurement

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Computational study of the influence of callus porosity on ultrasound propagation in healing bones

Computational study of the influence of callus porosity on u...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Vassiliki T. Potsika Ioannis F. Spiridon Vasilios C. Protopappas Maria G. Vavva Panagiotis D. Lymperopoulos Christos V. Massalas Demosthenes K. Polyzos Dimitrios I. Fotiadis Intelligent Information Systems University of Ioannina Ioannina GR Greece Panepistimio Ioanninon Ioannina GR Department of Mechanical Engineering and Aeronautics University of Patras Patras GR Greece Department of Mechanical Material and Aerospace Engineering Illinois Institute of Technology (IIT) Chicago IL USA Dept. of Materials Science and Engineering University of Ioannina Foundation for Research and Technology-Hellas (FORTH)

In the process of fracture healing, several phases of recovery are observed as the mechanical stability, continuity and normal load carrying capacity are gradually restored. The ultrasonic monitoring and discrimination of different healing stages is a complex process due to the significant microstructure and porous nature of osseous and callus tissues. In this study, we investigate the influence of the callus pores' size and concentration on ultrasound propagation in a long bone at a late healing stage. Different excitation frequencies are applied in the range of 300 kHz-1 MHz. A 2D geometry is developed and axial transmission calculations are performed based on a Finite Element Method. The velocity of the first arriving signal (FAS) and the propagation of guided waves are used as the estimated parameters. It was shown that the FAS velocity can reflect callus porosity changes, while the propagation of guided waves is sensitive to pores' distribution for higher frequencies.

关键词： Bones Ultrasonic imaging Acoustics Propagation materials Dispersion Numerical models

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Effect of Dopant Oxidation State and Annealing Atmosphere on the Functional Properties of Zinc Oxide-Based Nanocrystalline Powder and Thin Films

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MRS Online Proceedings Library (OPL) 2014年第1期1675卷 65-70页

作者： Miguel A. Santiago Rivera Gina M. Montes Albino Oscar Perales Pérez Dept. of Physics University of Puerto Rico Mayagüez PR 00681-9000 U.S.A. Mechanical Engineering Department University of Puerto Rico Mayagüez PR 00681-9000 U.S.A. Engineering Science and Materials Department University of Puerto Rico Mayagüez PR 00681-9000 U.S.A.

The effective incorporation of dopant species into ZnO host structure should induce changes in its physical and chemical properties enabling the establishment of novel multi-functional properties. Doping with transition metal ions and the subsequent exchange interaction between available spins of the magnetic species are expected to induce a ferromagnetic behavior. This ferromagnetic functionality will enable the application of this material in data storage and spintronics-based devices. The present research addresses the study of the effect of the oxidationstate of Fe species and the influence of the annealing atmosphere on the structural and functional properties of nanocrystalline ZnO-based powders.

关键词： ferromagnetic sol-gel optical properties

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