A Comparative Study Of The Dry And Wet Nano-Scale Electro-Machining,
2013
Western Kentucky University
A Comparative Study Of The Dry And Wet Nano-Scale Electro-Machining, M. P. Jahan, K. R. Virwani, Kamlakar P. Rajurkar, A. P. Malshe
Department of Mechanical and Materials Engineering: Faculty Publications
In recent years, a nano-electromachining (nano-EM) process based on a scanning tunneling microscope (STM) platform has been demonstrated. Nano-EM is capable of machining nano-features, under both, liquid dielectric (wet nano-EM) and air dielectric (dry nano-EM) media. The objective of this paper is to present a comparative study between the wet and dry nano-EM processes based on process mechanism, machining performance, consistency and dimensional repeatability of these two processes. The comparison of the two processes has been conducted at near field nano-EM, where the gap between the tool electrode and workpiece is 2 nm and the machining is performed at room …
Inducing Neurite Outgrowth By Mechanical Cell Stretch,
2013
University of Nebraska-Lincoln
Inducing Neurite Outgrowth By Mechanical Cell Stretch, Suzanne Higgins, Jeong Soon Lee, Ligyeom Ha, Jung Yul Lim
Department of Mechanical and Materials Engineering: Faculty Publications
Establishing extracellular milieus to stimulate neuronal regeneration is a critical need in neuronal tissue engineering. Many studies have used a soluble factor (such as nerve growth factor or retinoic acid [RA]), micropatterned substrate, and electrical stimulation to induce enhanced neurogenesis in neuronal precursor cells. However, little attention has been paid to mechanical stimulation because neuronal cells are not generally recognized as being mechanically functional, a characteristic of mechanoresponsive cells such as osteoblasts, chondrocytes, and muscle cells. In this study, we performed proof-of-concept experiments to demonstrate the potential anabolic effects of mechanical stretch to enhance cellular neurogenesis. We cultured human neuroblastoma …
Systems Biology Of The Functional And Dysfunctional Endothelium,
2013
Imperial College London
Systems Biology Of The Functional And Dysfunctional Endothelium, Jennifer Frueh, Nataly Maimari, Takayuki Homma, Sandra M. Bovens, Ryan M. Pedrigi, Leila Towhidi, Rob Krams
Department of Mechanical and Materials Engineering: Faculty Publications
This review provides an overview of the effect of blood flow on endothelial cell (EC) signalling pathways, applying microarray technologies to cultured cells, and in vivo studies of normal and atherosclerotic animals. It is found that in cultured ECs, 5–10% of genes are up- or down-regulated in response to fluid flow, whereas only 3–6% of genes are regulated by varying levels of fluid flow. Of all genes, 90%are regulated by the steady part of fluid flow and 10% by pulsatile components. The associated gene profiles show high variability from experiment to experiment depending on experimental conditions, and importantly, the bioinformatical …
Supplier Sustainability Evaluation Utilizing Multi Attribute Utility Modeling,
2013
University of Kentucky
Supplier Sustainability Evaluation Utilizing Multi Attribute Utility Modeling, Scott E. Ladd
Theses and Dissertations--Manufacturing Systems Engineering
Conventionally, the focus during supplier evaluation has been to assess cost, quality and delivery effectiveness due to their impact on profitability. In recent years, there has been increased emphasis on promoting more sustainable business practices that focus on reducing environmental impact and improve societal well-being, in addition to economic benefits. However, most of the existing supplier evaluation methods in literature as well as those used by leading companies fall short of comprehensively assessing suppliers from a Triple Bottom Line (TBL) perspective. TBL defined as holistically looking at the economic, environmental, and societal aspects of an entity. This paper presents a …
An Observational Study Of The Methods And Progress In Enterprise Lean Transformation At A Learning Health Care Organization,
2013
University of Kentucky
An Observational Study Of The Methods And Progress In Enterprise Lean Transformation At A Learning Health Care Organization, Christopher Michael Rosenbaum
Theses and Dissertations--Manufacturing Systems Engineering
The health care industry in the United States is increasingly pressured to improve safety and quality performance and increase revenue. In response, many health care institutions are moving to redesign their processes and practices in an effort to decrease costs and provide safer, higher quality, and more efficient care. The purpose of this paper is to document the Lean implementation strategy and progress in implementation at a large teaching health care organization undergoing Lean transformation in order to understand enterprise transformation strategies and the impact of leadership involvement on culture development and Lean implementation. Through direct observations and involvement and …
A Linear Multiplexed Electrospray Thin Film Deposition System,
2013
University of Central Florida
A Linear Multiplexed Electrospray Thin Film Deposition System, Brandon Lojewski
Electronic Theses and Dissertations
Liquid spray is essential to industries requiring processes such as spray coating, spray drying, spray pyrolysis, or spray cooling. This thesis reports the design, fabrication, and characterization of a thin film deposition system which utilizes a linear multiplexed electrospray (LINES) atomizer. First, a thorough review of the advantages and limitations of prior multiplexed electrospray systems leads to discussion of the design rationale for this work. Next, the line of charge model was extended to prescribe the operating conditions for the experiments and to estimate the spray profile. The spray profile was then simulated using a Lagrangian model and solved using …
Distal Placement Of An End-To-Side Bypass Graft Anastomosis: A 3d Computational Study,
2013
Old Dominion University
Distal Placement Of An End-To-Side Bypass Graft Anastomosis: A 3d Computational Study, John Di Cicco, Ayodeji Demuren
Mechanical & Aerospace Engineering Faculty Publications
A three-dimensional (3D) computational fluid dynamics study of shear rates around distal end-to-side anastomoses has been conducted. Three 51% and three 75% cross-sectional area-reduced 6 mm cylinders were modeled each with a bypass cylinder attached at a 30-degree angle at different placements distal to the constriction. Steady, incompressible, Newtonian blood flow was assumed, and the full Reynolds-averaged Navier-Stokes equations, turbulent kinetic energy, and specific dissipation rate equations were solved on a locally structured multiblock mesh with hexahedral elements. Consequently, distal placement of an end-to-side bypass graft anastomosis was found to have an influence on the shear rate magnitudes. For the …
Micro-Mechanics Based Representative Volume Element Modeling Of Heterogeneous Cementitious Materials,
2013
University of Mississippi
Micro-Mechanics Based Representative Volume Element Modeling Of Heterogeneous Cementitious Materials, Mohammadmehdi Shahzamanian Sichani
Electronic Theses and Dissertations
The current work focuses on evaluation of the effective elastic properties of cementitious materials through a voxel based FEA approach. Voxels are generated for a heterogeneous cementitious material (Type-I cement) consisting of typical volume fractions of various constituent phases from digital microstructures. The microstructure is modeled as a micro-scale representative volume element (RVE) in ABAQUS to generate cubes several tens of microns in dimension and subjected to various prescribed deformation modes to generate the effective elastic tensor of the material. The RVE-calculated elastic properties such as moduli and Poisson's ratio are validated through an asymptotic expansion homogenization (AEH) and compared …
Analysis Of Corn Stover Structural Properties For Mechanical Processing Applications,
2013
South Dakota State University
Analysis Of Corn Stover Structural Properties For Mechanical Processing Applications, Taylor Suess
The Journal of Undergraduate Research
The research objective of this study is to examine the behavior of chopped corn stover biomass as it undergoes a variety of mechanical loading conditions. Biomass materials, including corn stover, have unique properties that make it challenging to effectively and efficiently feed into thermochemical conversion systems that produce biofuels and bioproducts. These properties include large particle size, fibrous structure, and low density, to name a few. The most common difficulty in creating a system like this for corn stover is plugging within mechanical and pneumatic feeding systems. It is hypothesized that the material properties of fibrous corn stover contribute to …
Lanthanum Halide Nanoparticle Scintillators For Nuclear Radiation Detection,
2013
Remote Sensing Laboratory
Lanthanum Halide Nanoparticle Scintillators For Nuclear Radiation Detection, Paul Guss, Ronald Guise, Ding Yuan, Sanjoy Mukhopadhyay, Robert O’Brien, Daniel Robert Lowe, Zhitao Kang, Hisham Menkara, Vivek V. Nagarkar
Mechanical Engineering Faculty Research
Nanoparticles with sizesscintillators, in order to determine the viability of using scintillators employing nanostructured lanthanum trifluoride. Preliminary results of this investigation are consistent with the idea that these materials have an intrinsic response to nuclear radiation that may be correlated to the energy of the incident radiation.
Transparent Actuator Made With Few Layer Graphene Electrode And Dielectric Elastomer, For Variable Focus Lens,
2013
University of Nevada, Las Vegas
Transparent Actuator Made With Few Layer Graphene Electrode And Dielectric Elastomer, For Variable Focus Lens, Taeseon Hwang, Hyeok-Yong Kwon, Joon-Suk Oh, Jung-Pyo Hong, Seung-Chul Hong, Youngkwan Lee, Hyouk Ryeo Choi, Kwang J. Kim, Mainul Hossain Bhuiya, Jae Do Nam
Mechanical Engineering Faculty Research
A transparent dielectric elastomer actuator driven by few-layer-graphene (FLG) electrode was experimentally investigated. The electrodes were made of graphene, which was dispersed inN-methyl-pyrrolidone. The transparent actuator was fabricated from developed FLG electrodes.The FLG electrode with its sheet resistance of 0.45 kΩ/sq (80 nm thick) was implemented to mask silicone elastomer. The developed FLG-driven actuator exhibited an optical transparency of over 57% at a wavenumber of 600 nm and produced bending displacement performance ranging from 29 to 946 μm as functions of frequency and voltage. The focus variation was clearly demonstrated under actuation to study its application-feasibility in …
Magnetohydrodynamic Simulations Of Hypersonic Flow Over A Cylinder Using Axial- And Transverse-Oriented Magnetic Dipoles,
2013
University of Akron, main campus
Magnetohydrodynamic Simulations Of Hypersonic Flow Over A Cylinder Using Axial- And Transverse-Oriented Magnetic Dipoles, Andrew N. Guarendi, Abhilash J. Chandy
Mechanical Engineering Faculty Research
Numerical simulations of magnetohydrodynamic (MHD) hypersonic flow over a cylinder are presented for axial- and transverse-oriented dipoles with different strengths. ANSYS CFX is used to carry out calculations for steady, laminar flows at a Mach number of 6.1, with a model for electrical conductivity as a function of temperature and pressure. The low magnetic Reynolds number (≪1) calculated based on the velocity and length scales in this problem justifies the quasistatic approximation, which assumes negligible effect of velocity on magnetic fields. Therefore, the governing equations employed in the simulations are the compressible Navier-Stokes and the energy equations with MHD-related source …
Nonoscillatory Central Schemes For Hyperbolic Systems Of Conservation Laws In Three-Space Dimensions,
2013
University of Akron, main campus
Nonoscillatory Central Schemes For Hyperbolic Systems Of Conservation Laws In Three-Space Dimensions, Andrew N. Guarendi, Abhilash J. Chandy
Mechanical Engineering Faculty Research
We extend a family of high-resolution, semidiscrete central schemes for hyperbolic systems of conservation laws to three-space dimensions. Details of the schemes, their implementation, and properties are presented together with results from several prototypical applications of hyperbolic conservation laws including a nonlinear scalar equation, the Euler equations of gas dynamics, and the ideal magnetohydrodynamic equations. Parallel scaling analysis and grid-independent results including contours and isosurfaces of density and velocity and magnetic field vectors are shown in this study, confirming the ability of these types of solvers to approximate the solutions of hyperbolic equations efficiently and accurately.
Coupled Continuum And Molecular Model Of Flow Through Fibrous Filter,
2013
University of Akron, main campus
Coupled Continuum And Molecular Model Of Flow Through Fibrous Filter, Shunliu Zhao, Alex Povitsky
Mechanical Engineering Faculty Research
A coupled approach combining the continuum boundary singularity method (BSM) and the molecular direct simulation Monte Carlo (DSMC) is developed and validated using Taylor-Couette flow and the flow about a single fiber confined between two parallel walls. In the proposed approach, the DSMC is applied to an annular region enclosing the fiber and the BSM is employed in the entire flow domain. The parameters used in the DSMC and the coupling procedure, such as the number of simulated particles, the cell size, and the size of the coupling zone are determined by inspecting the accuracy of pressure drop obtained for …
A Closed-Form Solution For The Similarity Transformation Parameters Of Two Planar Point Sets,
2013
Universiti Teknikal
A Closed-Form Solution For The Similarity Transformation Parameters Of Two Planar Point Sets, Shamsul A. Shamsudin, Andrew P. Murray
Mechanical and Aerospace Engineering Faculty Publications
Image registration covers the set of techniques used in matching images of the same scene. A subset of the image registration problem, identifying the parameters in a similarity transformation, has emerged as useful in a recently defined area of machine design: designing mechanisms for rigidbody shape-change. First, this brief paper shows a potential use for image registration techniques outside the field of machine vision. Second, it presents a closed-form solution for the similarity transformation parameters when the point sets to be matched are restricted to two-dimensional space as is needed in the aforementioned design problem.
Test 2079: John Deere 6140m,
2013
University of Nebraska-Lincoln
Test 2079: John Deere 6140m, Nebraska Tractor Test Lab
Nebraska Tractor Tests
ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …
Test 2069: Case Ih Steiger 350 Rowtrac,
2013
University of Nebraska-Lincoln
Test 2069: Case Ih Steiger 350 Rowtrac, Nebraska Tractor Test Lab
Nebraska Tractor Tests
ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …
Test 2058: John Deere 6140d,
2013
University of Nebraska-Lincoln
Test 2058: John Deere 6140d, Nebraska Tractor Test Lab
Nebraska Tractor Tests
ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …
Nebraska Summary: S950 Case-Ih Farmall 105u,
2013
University of Nebraska-Lincoln
Nebraska Summary: S950 Case-Ih Farmall 105u, Nebraska Tractor Test Lab
Nebraska Tractor Tests
ABOUT THE TEST REPORT AND USE OF THE DATA The test data contained in this report are a tabulation of the results of a series of tests. Due to the restricted format of these pages, only a limited amount of data and not all of the tractor specifications are included. The full OECD report contains usually about 30 pages of data and specifications. The test data were obtained for each tractor under similar conditions and therefore, provide a means of comparison of performance based on a limited set of reported data. EXPLANATION OF THE TEST PROCEDURES Purpose The purpose of …
Laser Assisted Milling Of Difficult To Machine Materials,
2013
Purdue University
Laser Assisted Milling Of Difficult To Machine Materials, Gary Kent Hedberg
Open Access Theses
Titanium alloys are well known for their excellent strength to weight ratio and corrosion resistance and is highly sought after in the aerospace industry. Additionally, titanium alloys maintain a high biocompatibility for implants and other medical devices. However, these alloys are notorious for their poor machinability. As the demand for these alloys continue to increase, improved methods of manufacture must be explored. ^ This thesis describes Laser Assisted Milling (LAML) of Ti-6AL-4V (Ti-64) alloys, which studies localized preheating of the workpiece by a laser and characterizes the improvements to the machinability of these metals. Laser parameters are determined based on …
