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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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Investigating the effects of knee joint motion schemes on knee joint injury: A finite element analysis

Investigating the effects of knee joint motion schemes on kn...

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Annual Northeast Bioengineering Conference

作者： Alexander D. Orsi Srinath Chakravarthy Ashkan Vaziri Hamid Nayeb-Hashemi Ruben Goebel Paul K. Canavan Estefania Peña Dept. of Mechanical Engineering Northeastern University Boston MA USA Northeastern University Boston MA US Dept. of Physical Therapy Windham Hospital Storrs CT USA Sports Science Program Qatar University Doha Qatar Bioengineering Division Research University of Zaragoza Zaragoza Spain

This study uses a three dimensional model of the knee joint to determine which knee joint motion schemes lead to ACL injury, while exploring the possible types of concomitant injuries associated with each motion scheme. The physical elements of the knee joint including bones, articular cartilage, meniscus and ligaments were obtained by reconstructing magnetic resonance images. A failure locus representing the relationship between motion schemes and knee joint injury was created from finite element simulations considering knee flexion, femoral axial rotation and both valgus and varus motion. The relationships between knee joint orientation and various tissue failures were examined and susceptibility spectrums for knee injuries were obtained. The posterolateral bundle demonstrated higher rupture susceptibility than the anteromedial bundle. The average varus angular displacement for ACL failure was 46.6\% lower than the average valgus angular displacement. Femoral external rotation decreases overall ACL valgus/varus failure angle by 27.5\% compared to internal rotation. Articular cartilage injury was shown to occur prior to ACL failure in all valgus simulations. A simplified and computationally efficient version of the full 3D model showed close correlation to the complete model with respect to ligament failure and shows that if only ligament failure is of interest, a simple model can be used. The results of this study highlight several detrimental joint motions and can aid in improved clinical diagnoses and improved training programs for athletes.

关键词： Injuries Ligaments Joints Finite element analysis Solid modeling Computational modeling Knee

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Application of CFD technology to a problem in energy and environment: Geological Carbon Sequestration

Application of CFD technology to a problem in energy and env...

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51st AIAA Aerospace sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

作者： Agarwal, Ramesh K. Zhang, Zheming Dept. of Mechanical Engineering and Materials Science Washington University St. Louis MO 63130 United States

ISBN: (纸本)9781624101816

Geological Carbon Sequestration (GCS) is one of the most promising technologies to address the issue of excessive anthropogenic CO2 emissions into the atmosphere due to fossil fuel combustion for electricity generation. For GCS, the saline aquifer geological carbon sequestration (SAGCS) is considered very attractive compared to other options because of their huge sequestration capacity in U.S. and other parts of the world. However, in order to fully exploit their potential, the injection strategies need to be investigated that can address the issues of both the CO2 storage efficiency and safety along with their economic feasibility. Numerical simulations can be used to determine these strategies before the deployment of full scale sequestration in saline aquifers. We have developed a genetic algorithm (GA) based optimizer for the wellknown multi-phase numerical simulator TOUGH2 to study the optimization of various injection strategies for achieving the optimal storage efficiency as well as reduction in plume migration. The new integrated code (TOUGH2 solver and the optimizer) is designated as GATOUGH2. This paper presents the numerical simulations of CO2 sequestration in three large identified saline aquifers (Mt. Simon, Frio and Utsira) where the sequestration is currently underway or has been recently completed (in case of Frio). The results of simulations are compared with the available seismic data. In addition the GATOUGH2 is applied to evaluate various injection strategies to achieve the goals of enhanced storage efficiency and reduced plume migration. The results of large scale history-matching simulations in Mt. Simon, Frio and Utsira formations provide important insights in the uncertainties associated with the numerical modeling of SAGCS. The results of alternative optimization designs show promise of achieving the desired objectives of enhancing the storage efficiency significantly while reducing the plume migration, brine movement and pressure impact in

关键词： Storage efficiency

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Estimation of acoustic losses in the quality factor of a micromechanical 2D resonator

Estimation of acoustic losses in the quality factor of a mic...

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20th International Congress on Sound and Vibration 2013, ICSV 2013

作者： Vishwakarma, Santhosh Doreswamy Pratap, Rudra Pandey, Ashok Kumar Parpia, Jeevak M. Southworth, Darren Robert Barton, Robert Anthony Craighead, Harold G. Dept. of Mechanical Engineering Indian Institute of Science Bangalore 560012 India Dept. of Mechanical Engineering Indian Institute of Technology Hyderabad 502205 India Center for Materials Research Cornell University Ithaca NY 14853 United States

ISBN: (纸本)9781629931500

A semi-analytical study of the acoustic radiation losses associated with various transverse vibration modes of a micromechanical (MEMS) annular resonator is presented. The quality factor, Q, of such resonators is of interest in many applications and depends on structural geometry, fluid-structure interaction, and the device encapsulation. Resonators with at least one surface exposed to air can display significant losses through acoustic radiation even at μm dimensions. In this study, well established analytical techniques for modeling resonator vibration modes and fluid-structure interaction are used in conjunction with numerical and symbolic computation to establish a semi-analytical procedure for computing Q due to acoustic radiation losses, Qac, in any vibrational mode. The procedure includes calculation of the exact modeshape using computer algebra with an FEM based calculation as the starting point. This modeshape is then used for acoustic field calculations that lead to the computation of Qac. The computed values of Q ac show a non-monotonic variation with the increasing modal frequencies. This non-monotonic variation in Qac is attributed to the radiation efficiency associated with various modes of the annular resonator. There exists an inverse relationship between the acoustic radiation efficiency and the Qac for various resonant frequencies. With the increase in the number of nodal circles and diameters, the radiation efficiency decreases and hence Qac increases. Results are compared for the lowest two modes of a solid circular resonator using exact mode shapes to those of Lamb's approximate mode shapes. Comparison to published experimental results validates the predictive utility of the proposed technique, especially for higher modes where acoustic radiation is the dominant constituent of Q. The hybrid analytical-computational procedure established here can be used in choosing appropriate mode shapes of the resonator for the desired Q.

关键词： Fluid structure interaction

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Printing multi-functionality: Additive manufacturing for cubesats

Printing multi-functionality: Additive manufacturing for cub...

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AIAA SPACE 2014 Conference and Exposition

作者： Kief, Craig J. Aarestad, Jim MacDonald, Eric Shemelya, Corey Roberson, David Wicker, Ryan Kwas, Andy M. Zemba, Mike Avery, Keith Netzer, Richard Kemp, William W. M. Keck Center for 3D Innovation University of Texs at El Paso El Paso TX 79902 United States Northrop Grumman Technical Services Albuquerque NM 87109 United States NASA Glenn Research Center Cleveland OH 44135 United States Air Force Research Laboratory Albuquerque NM 87117 United States LEIDOS Albuquerque NM 87109 United States COSMIAC 2350 Alamo Avenue SE United States Department of Electrical and Computer Engineering United States Department of Materials Science and Engineering United States Department of Mechanical Engineering United States Dept. of Electrical and Computer Engineering UNM Engineering Manager Northrop Grumman Technical Services 100 Sun Ave United States Antena and Optics Systems Branch 21000 Brookpark Rd United States AFRL/RVSE 3550 Abdeen Ave SE Albuquerque NM 87117 United States 2109 Air Park Rd. SE Ste 150 Albuquerque NM 87106 United States

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