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EB3 2201

September 2016

Seminar – High Temperature Split Hopkinson (or Kolsky) Bar Techniques – Dr. Bo Song

September 9, 2016 @ 11:30 am

High Temperature Split Hopkinson (or Kolsky) Bar Techniques Bo Song Sandia National Laboratories     Abstract Abnormal thermal-mechanical environment requires a thorough understanding of mechanical response of alloys at high strain rates and elevated temperatures for optimization of manufacturing process, e.g., forging process, and safety design and analysis in high-temperature applications.  Split Hopkinson bar, also called Kolsky bar, has been extensively utilized for mechanical characterization of materials in a variety of loading modes, e.g., compression, tension, or shear, at high…

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October 2016

Seminar – The structural engineering skills of orb-web spiders – Dr. Ramón Zaera

October 7, 2016 @ 11:30 am

Seminar Title: The structural engineering skills of orb-web spiders Oct. 7th Professor Ramón Zaera, Department of Continuum Mechanics and Structural Analysis, University Carlos III of Madrid, Spain Abstract: An orb-weaving spider’s likelihood of survival is influenced by its ability to retain prey with minimum damage to its web and at the lowest manufacturing cost. This set of requirements has forced spider silk to evolve towards extreme strength and ductility to a degree that is rarely observed among other materials, either…

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Seminar – Recent Progress in Various Properties of CNT Wires and Fiber Reinforced Composites – Dr. R. Asmatulu

October 28, 2016 @ 11:30 am

Recent Progress in Various Properties of CNT Wires and Fiber Reinforced Composites Dr. R. Asmatulu Department of Mechanical Engineering, Wichita State University 1845 Fairmount, Wichita, KS 67260-0133 Email: ramazan.asmatulu@wichita.edu   Abstract Recent studies on carbon nanotube (CNT) wires and fiber reinforced composite materials have been continuously increasing due to their amazing mechanical, electrical, and thermal properties. These materials are considered to be the next generation of lighter and stronger aircraft and wind turbines, faster cars, more sensitive sensors, more powerful…

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February 2017

Seminar­- Cyclic Variations of In­cylinder Multi­phase Multiinteraction Processes in Gasoline Direct Injection Engines – D Hung

February 3, 2017 @ 11:30 am

Cyclic Variations of In-­cylinder Multi­-phase Multi-­interaction Processes in Gasoline Direct Injection Engines   Professor David L.S. Hung University of Michigan­ - Shanghai Jiao Tong University Joint Institute Institute of Automotive Engineering, School of Mechanical Engineering Shanghai Jiao Tong University, Shanghai, China   Abstract New vehicles equipped with gasoline direct injection (GDI) engines have demonstrated high potentials in improving combustion performance and fuel efficiency. However, the cyclic variations of in­cylinder flow field represent a significant challenge which influence the stability and…

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Seminar – Smart Damping Strategyies for High Performance Machining – Dr. Jay Tu

February 10, 2017 @ 11:30 am

Title:  Smart Damping Strategies for High Performance Machining Speaker: Jay F. Tu, Professor, MAE, NCSU Abstract: This presentation focuses on the research work on machining conducted by Prof. Jay F. Tu during his scholarly reassignment in 2016 at University West, Sweden.  Prof. Tu worked with researchers at a university research center, Production Technology West, along with several affiliated Swedish companies. Machining systems are inherently low in damping, susceptible to forced or self-excited vibrations due to the interaction between the cutting…

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March 2017

Seminar- Printed Active Composites and 4D Printing

March 31, 2017 @ 11:30 am

  Printed Active Composites and 4D Printing EB III 2201 H. Jerry Qi The George W. Woodruff School of Mechanical Engineering Renewable Bioproducts Institute Georgia Institute of Technology ABSTRACT Recent advances in digital manufacturing allow the precise placement of multiple materials at micrometer resolution with essentially no restrictions on the geometric complexity of the spatial arrangement. Complex 3D solids thus can be created with highly non-regular material distributions in an optimal fashion, enabling the fabrication of devices with unprecedented multifunctional…

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April 2017

Seminar- Strain Measurement of Nanocomposite Structures -Dr. Sivaram Arepalli

April 7, 2017 @ 11:30 am

Strain Measurement of Nanocomposite Structures Sivaram Arepalli Dept. of Chemical and Biomolecular Engineering, Rice University, Houston Abstract Strain measurement provides critical information for structural health monitoring of mechanical structures of interest in aerospace, automotive and medical fields. Addition of nanocomposites to a variety of these structural elements are known to improve their mechanical, electrical, thermal and optical properties. Nanoscale probing of these composites are conducted using contact as well as non-contact methods. In-situ monitoring of local strain helps to better…

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Seminar – Acoustofluidics: merging acoustics and microfluidics for biomedical applications – Dr. Huang

April 21, 2017 @ 11:30 am

Acoustofluidics: merging acoustics and microfluidics for biomedical applications Tony Jun Huang Professor of Mechanical Engineering and Materials Science (MEMS) Pratt School of Engineering Duke University Group Website: https://acoustofluidics.pratt.duke.edu/ ABSTRACT The past two decades have witnessed an explosion in lab-on-a-chip research with applications in biology, chemistry, and medicine. The continuous fusion of novel properties of physics into microfluidic environments has enabled the rapid development of this field. Recently, a new lab-on-a-chip frontier has emerged, joining acoustics with microfluidics, termed acoustofluidics. Here…

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May 2017

Seminar – The impact of local structure on macroscopic properties of ABO3 perovskite relaxor – Dr. Shujun Zhang

May 19, 2017 @ 11:30 am

The impact of local structure on macroscopic properties of ABO3 perovskite relaxor   Shujun Zhang1*, Fei Li2, Long-Qing Chen2 and Thomas R. Shrout2 1 Institute for Superconducting and Electronic Materials, Australia Institute of Innovative Materials, University of Wollongong, NSW 2500, Australia 2 Materials Research Institute, Pennsylvania State University, University Park, PA 16802, US * shujun@uow.edu.au   Relaxor materials with ABO3 perovskite structure have been actively studied for the potential optical, dielectric and piezoelectric applications. Relaxors show remarkable properties, such as…

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Seminar – Scalable Manufactured Micro/Nano-Structured Surfaces for Heat Transfer Applications – Dr. Ronggui Yang

May 25, 2017 @ 11:30 am

Ronggui Yang Professor, ASME Fellow Department of Mechanical Engineering, University of Colorado at Boulder ronggui.yang@colorado.edu, http://spot.colorado.edu/~vangr   Thermal transport plays an important role in energy conversion efficiency and device reliability. There were significant progresses over the past two decades on utilizing micro/nanostructures for enhancing or reducing heat transfer owing much to the challenging needs in energy conversion, storage and thermal management systems. Yet, cost-effectiveness plays a key role in engineering micro/nanostructures for heat transfer applications. In this talk, I will…

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December 2017

SEMINAR – Smart Micro/nano-Structures, Devices and Applications

December 15, 2017 @ 11:30 am - 12:15 pm

Abstract: Smart micro/nano-structures and sensors are increasingly important for the smart world. In this talk, recent progresses inn our lab on piezoelectric and flexoelectric micro/nano-structures and the associated devices are presented for applications in biomedical, mechanical, aerospace, civil and energy engineering. In specific, small aperture piezoelectric ultrasound transducers were designed, fabricated and characterized for intravascular ultrasound imaging and therapy. Contrast materials and nanomaterials were also studied for contrast enhanced ultrasound imaging, drug delivery and thrombolysis. Flexoelectric materials and structures were…

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January 2018

SEMINAR – Optoacoustics: Combining Light with Sound

January 12, 2018 @ 10:00 am - 11:00 am

Abstract: Light and sound can be combined in interesting ways for many applications in biomedical imaging and non-destructive evaluation. In this talk we will explore three examples of combining light and sound for different applications: light to generate sound (photoacoustic imaging); light to detect sound (laser ultrasonics); and sound to modulate light (optical coherence elastography). In each case, combining light and sound can overcome common problems encountered in pure optical or ultrasonic systems. Biography: Following undergraduate, graduate, and post-doctoral training…

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SEMINAR – Experimental and Computational Mechanics of Nonwovens

January 19, 2018 @ 10:00 am - 11:00 am

Abstract: Nonwovens are ubiquitous in both industrial and commercial applications due to their characteristic high surface area, high porosity, damage tolerance, low cost, and the multiplicity of options for tailoring their properties. However, the properties are challenging to predict from a microstructural basis due to the irregular, ill defined, and evolving structure. In particular it is difficult to make a priori designs for strength and toughness. In this talk I will present my group’s work towards understanding the micromechanics of…

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SEMINAR – Numerical Simulation of High Mach Number Viscous Flow

January 26, 2018 @ 10:00 am - 11:00 am

Abstract: To support the design of high-speed air vehicles, a number of scientific challenges must be addressed in the prediction and control of supersonic and hypersonic flow. The present talk focuses on two main themes: large-scale unsteadiness and plasma-based flow control. Some preliminary work on hypersonic transition will also be discussed. Large-scale separation unsteadiness is a crucial issue in high-speed aircraft design because it promotes structural fatigue loading. To investigate the phenomenon, spectra of wall pressure fluctuations were compared for…

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February 2018

SEMINAR – Publishing with Nature Communications

February 2, 2018 @ 10:00 am - 11:00 am

Abstract: Nature journals communicate the world’s best and most important science to scientists and the broader community interested in science - but navigating the publishing world can oftentimes seem challenging. Nature Communications, a multidisciplinary online-only fully open access journal, publishes important advances in specialized research areas. From submit through accept, the full-time editorial staff provides a streamlined workflow. In this talk, I will discuss our editorial criteria and workflow in the context of the family of Nature journals, along with…

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SEMINAR – CANCELLED

February 9, 2018 @ 10:00 am - 11:00 am

ATTENTION: This seminar has been cancelled. Abstract: Autonomous driving has made great strides since the 2007 DARPA Urban Challenge (DUC). In particular, the ability to perceive complex scenes is perhaps the greatest challenge for these vehicles — from driving with no GPS coverage or new environments, to driving in scenes with cars, cyclist, pedestrians, poor weather, and even new and changing construction. This talk will start with an overview of the 2007 DUC, including Cornell’s well received LocalMap - a…

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March 2018

SEMINAR: Limiting Techniques for High-Order Finite Element Discretizations of Conservation Laws

March 2, 2018 @ 10:00 am - 11:00 am

Abstract: The main focus of this talk is on the design of high-resolution finite element schemes for scalar conservation laws and hyperbolic systems. A unified limiting strategy is proposed for continuous and discontinuous Galerkin approximations. Using the Bernstein basis representation of polynomial shape functions, we modify the high-order discretization so as to enforce local discrete maximum principles for the coefficients and guarantee that numerical solutions stay in the admissible range. The development of accuracy-preserving limiters for high-order Bernstein finite elements…

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SEMINAR: Non-Contact Vital Sign Detection and Monitoring

March 16, 2018 @ 10:00 am - 11:00 am

Abstract: The vital sign detection based on microwave Doppler radar has the capability of measuring vital sign signals, such as heartbeat and respiration, without directly attaching electrodes to the skin, and can measure the vital sign at a distance or even through an obstacle. However, for this non-contact vital sign detection approach, phase noise of the received signal can have serious adverse effects on the detection capability and accuracy since the chest displacement caused by breathing and heart beating, especially…

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SEMINAR: Development of ChiDG – An Overset Grid Discontinuous Galerkin Navier-Stokes Equation Solver

March 23, 2018 @ 10:00 am - 11:00 am

Abstract: This talk will explore the development of ChiDG, an overset grid approach that employs the Discontinuous Galerkin approach for the solution of the Navier-Stokes equations. The methodology is presented along with example solutions and an invitation for attendee downloading and use. The approach permits arbitrary high order representations of the governing equations, curved elements and overset grids, the solver features quadratic convergence for the steady state form of the equations. Biography: Paul D. Orkwis , Ph.D. is Interim Dean…

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April 2018

SEMINAR:The Search for Edge States (Boundary Modes) in Mechanical Metamaterials

April 6, 2018 @ 10:00 am - 11:00 am

Abstract: Recent breakthroughs in condensed matter physics are opening new directions in band engineering and wave manipulation. Specifically, challenging the notions of reciprocity, time-reversal symmetry and sensitivity to defects in wave propagation may disrupt ways in which mechanical metamaterials are designed and employed, and may enable totally new functionalities. Non-reciprocity and topologically protected wave propagation will have profound implications on how stimuli and information are transmitted within materials, or how energy can be guided and steered so that its effects…

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SEMINAR: Quantitative ultrasound techniques for monitoring cervical remodeling in pregnancy

April 20, 2018 @ 10:00 am - 11:00 am

Abstract: The cervix is a remarkable organ. One of its tasks is to remain firm and “closed” (5 mm diameter cervical canal) prior to pregnancy. Shortly after conception the cervix begins to soften through collagen remodeling and increased hydration. As the fetus reaches full-term there is a profound breakdown in the collagen structure. At the end of this process, the cervix is as soft as warm butter and the cervical canal has dilated to about 100 mm diameter. Errors in…

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SEMINAR: Virtual Surgery

April 27, 2018 @ 10:00 am - 11:00 am

Abstract: Virtual surgery is an emerging field that involves the development of novel systems with visual as well as haptic (touch) interfaces, designed to provide immersive interactive experience where the user is able to touch, feel, and manipulate virtual tissues and organs through surgical tool handles used in actual surgery. With as many as 440,000 deaths a year, medical errors, taken as a group, rank as the third leading cause of death in the US, right after cancer and cardiovascular…

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August 2019

SEMINAR: Ultrasound in Complex Biological Media for Tissue Characterization

August 30 @ 10:00 am - 11:00 am

Abstract: Ultrasound is highly attractive because it is non-invasive, widely available and relatively inexpensive. Therefore, this imaging modality holds more promise than any other for screening common diseases (such as cancer or osteoporosis, which affect millions every year), and monitoring the response to treatments. There are however major drawbacks to conventional ultrasound methods: they lack specificity, remain qualitative, and are unsuitable for complex heterogeneous organs such as bone and the lung.  It is however possible to leverage the complexity of…

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September 2019

SEMINAR: Nonlinear Dynamics: A Journey Through Experiments and Computations

September 6 @ 10:00 am - 11:00 pm

Abstract: Dynamics of a variety of mechanical and structural systems need consideration of nonlinearities. In this talk, a collection of experiments and computations conducted to further our understanding of nonlinear dynamics will be presented. The experimental and computational findings will be explained with the help of analytical studies. Grazing dynamics, energy localization, slow-scale and fast-scale decompositions, delay dynamics, and buckling influenced oscillations will be considered to illustrate the ubiquitous presence of nonlinearity influenced phenomena across length scales. Relevance of the…

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SEMINAR: Scaling and Printing Electronics Using Nanomaterials

September 13 @ 10:00 am - 11:00 am

Abstract: Silicon-based electronics remain the backbone of the ongoing digital revolution and continue to enhance computational ability, as well as the accessibility of data.  As the range of possible applications for electronics grows, so does the realization that there are distinct limits to what silicon can do. Meanwhile, nanomaterials have been studied for decades for their attractive electronic properties coupled with mechanical flexibility, thermal resilience, and compatibility with solution-phase processing.  From 1D carbon nanotubes (CNTs) to 2D graphene and transition…

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SEMINAR: Deployable Composite Structures for Spacecraft Applications

September 20 @ 10:00 am - 11:00 am

Abstract:  Composite materials are light-weight with a high stiffness and strength, which makes them particularly well suited for use in spacecraft applications. In order to get to space they must be stored in a small space and deployed once in orbit. This is often a very challenging design problem that requires a detailed understanding of the material behavior. In this talk I will explore the carbon fiber deployable boom systems that have been created at NCSU. This will entail a…

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October 2019

SEMINAR: Fishnet Statistics for Design of Quasibrittle and Biomimetic Materials and Structures for Failure Probability <10-6

October 4 @ 10:00 am - 11:00 am

Abstract: The failure probability of engineering structures such as bridges, airframes and MEMS ought to be <10-6. This is a challenge. For perfectly brittle and ductile materials obeying the Weibull or Gaussian distributions with the same coefficient of variation, the distances from the mean strength to 10-6 differ by cca 2:1. For quasibrittle or architectured materials such as concrete, composites, tough ceramics, rocks, ice, foams, bone or nacre, this distance can be anywhere in-between. This necessitates a new theory of…

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SEMINAR: Strain and Isotopic Effects in Two-Dimensional WSe2

October 18 @ 10:00 am - 11:00 am

Abstract: Control over disorder arising from nonequilibrium of atomic positions and distributions of mass offers a promising route to design nanomaterial properties for integration into a wide range of existing and future applications. In this talk, I will discuss our recent results on three areas where atomic-scale non-equilibrium and disorder can bring about profound enhancements in both physical and chemical properties, and preview the new methodologies that we are developing to establish atomic-level structure-transport property relationships in individual nanomaterials using…

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SEMINAR: Ultrasonic Elasticity Imaging with Acoustic Radiation Force

October 25 @ 10:00 am - 11:00 pm

Abstract Elasticity imaging involves introducing a mechanical tissue perturbation, imaging the resulting tissue response, and generating images that reflect the underlying mechanical properties of the tissue.  Acoustic radiation force impulse (ARFI) based ultrasonic elasticity imaging methods have become widely available in the clinical market over the past five years. To date, these methods have found success clinically in the context of hepatic fibrosis staging and breast lesion characterization, with many additional applications under investigation.   A major focus our laboratory…

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November 2019

SEMINAR: Distributed Sensing for Mechanical and Biomedical Systems

November 1 @ 10:00 am - 11:30 am

Abstract Sensor technologies are the foundation of all “smart” technologies, e.g. mobile health, robotics, smart grid, environmental monitoring, structural health monitoring, etc. A major challenge for sensor research is to achieve densely distributed, wireless, low power consumption sensor networks. This talk presents the study of microwave patch antenna sensors to address this challenge. We discovered that a microstrip patch antenna can be designed to sense various physical parameters, including strain, pressure, shear, and crack etc. Since the patch antenna also…

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