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Articles 1 - 30 of 294
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How Structural Complexity Of Vegetation Facilitates Invasion: Integrating Lidar And Fia Invasive Species Plot Data In The Appalachian Mountains Of The Usa, Buddhika D. Madurapperuma, Basil V. Iannone Iii, Jinha Jung, Bryan C. Pijanowski, Songlin Fei, Gang Shao
How Structural Complexity Of Vegetation Facilitates Invasion: Integrating Lidar And Fia Invasive Species Plot Data In The Appalachian Mountains Of The Usa, Buddhika D. Madurapperuma, Basil V. Iannone Iii, Jinha Jung, Bryan C. Pijanowski, Songlin Fei, Gang Shao
Purdue GIS Day
This study examines how the vertical structure of forests and the variation in forest canopy tree composition relates to where forest plant invasions occur at a regional scale. We used LiDAR data on vertical structure of forests collected across 16 counties of western North Carolina, and Forest Inventory and Analysis (FIA) abundance data of invasive plant species and canopy tree species from 575 plots. We found that nearly one third of these plots were invaded by at least one invasive plant species (range = 1 to 8 species). We derived canopy gaps/clear-cut areas of the study site using LiDAR data …
Giscience Driven R&D: Interdisciplinary Gist Group At Oak Ridge National Laboratory, Marie Urban
Giscience Driven R&D: Interdisciplinary Gist Group At Oak Ridge National Laboratory, Marie Urban
Purdue GIS Day
Oak Ridge National Laboratory (ORNL) is the largest DOE multi-research facility in the US and is located in Oak Ridge, TN. One of the signature strengths of ORNL is Computational Science and Engineering and the Geographic Information Science and Technology (GIST) group contributes to that strength as part of the Computer Sciences and Engineering Division (CSED) within the Computer Sciences Directorate. The GIST group is at the forefront of High Resolution Population and Social Dynamics research and development resulting in innovative products such as LandScan Global (population distribution at 30 arc seconds) and now LandScan HD (population distribution at 3 …
Great Lakes Basin Analysis Using L-Thia, Ibrahim D. Hinds, Larry Theller
Great Lakes Basin Analysis Using L-Thia, Ibrahim D. Hinds, Larry Theller
Purdue GIS Day
The objective of this project is to provide a scientific estimate of the surface runoff and water quality within the Great Lakes watershed. A “Big Data” Long-term Hydrologic Impact (L-THIA) model was used for the analysis inside an ArcMAP user interface.
Gis Professional Certification 2.0: Putting Gis To The Test, Nancy Obermeyer
Gis Professional Certification 2.0: Putting Gis To The Test, Nancy Obermeyer
Purdue GIS Day
No abstract provided.
Transforming Small Localized Loading Into Large Rotational Motion In Soft Anisotropically-Structured Materials, Stephan Rudykh, Mary Boyce
Transforming Small Localized Loading Into Large Rotational Motion In Soft Anisotropically-Structured Materials, Stephan Rudykh, Mary Boyce
Society of Engineering Science 51st Annual Technical Meeting
Actuation of rotational motion in machines and robotics is generally achieved through highly engineered mechanical or electromechanical devices. As the field of soft robotics develops, there is an emerging and expanding need for novel actuation mechanisms. Here, we show the ability to transform small localized loading into large rotational motion via the design of soft anisotropically structured composite materials. The transformation mechanism governing the rotational actuation capitalizes on the underlying coupling of shear and normal modes of stress and strain in anisotropic materials together with the ability of the soft material to locally undergo large deformation [1, 2]. The transformation …
3d Bulk Grain Evolution In Polycrystalline Cu:Comparison Between Hedm Observation And Fft Based Crystal Plasticity Simulations, Reeju Pokharel
3d Bulk Grain Evolution In Polycrystalline Cu:Comparison Between Hedm Observation And Fft Based Crystal Plasticity Simulations, Reeju Pokharel
Society of Engineering Science 51st Annual Technical Meeting
In this study, microstructural evolution in polycrystalline Cu is studied via high-energy X-ray diffraction microscopy (HEDM) and compared to the results of a fast Fourier transform (FFT) based small strain formulation of a crystal plasticity (CP) deformation model [1]. The nondestructive nature of the HEDM experiments enable in-situ measurement of bulk samples, thus allowing access to volumetric microstructure maps through multiple stages of deformation. A uniaxial tension experiment was performed and the reconstructed 3D image [2] of the initial state is used as a direct input in the CP-FFT model to simulate plastic deformation. Macroscopic texture evolution as well as …
Computing Third-Order Models Of Effective Material Behavior For Polydisperse Particulate Composites Using Well-Resolved Higher Order Statistical Descriptors, Andrew Gillman, Karel Matouš
Computing Third-Order Models Of Effective Material Behavior For Polydisperse Particulate Composites Using Well-Resolved Higher Order Statistical Descriptors, Andrew Gillman, Karel Matouš
Society of Engineering Science 51st Annual Technical Meeting
Accurately characterizing and modeling random heterogeneous media such as energetic materials, geomaterials, and other granular systems is essential to improving design and developing new material formulations. The focus of this study is to estimate and bound the effective thermo-mechanical behavior using well-resolved statistical descriptions of polydisperse particulate systems to develop microstructure–statistics–property relations. In past study related to bounding effective material properties using variational methods that incorporate statistical information about the microstructure, assumptions are often made about the configuration (isotropy, ellipsoidal symmetry, monodisperse spheres) to simplify analysis. However, real systems are often not composed according to these microstructural assumptions. When these …
Quasistatic And Dynamic Mechanical Responses Of Load-Bearing Structural Batteries For Electric Vehicles, Waterloo Tsutsui, Hangjie Liao, Yuezhong Feng, Thomas Siegmund, Wayne Chen
Quasistatic And Dynamic Mechanical Responses Of Load-Bearing Structural Batteries For Electric Vehicles, Waterloo Tsutsui, Hangjie Liao, Yuezhong Feng, Thomas Siegmund, Wayne Chen
Society of Engineering Science 51st Annual Technical Meeting
We are in the process of developing multifunctional load-bearing structural batteries for electric vehicles (EVs). The battery system not only stores electricity for vehicle propulsion, but also reduces impact forces for the EVs getting into crash loading conditions functioning as a shock absorber, thus decreasing the impact shock to the vehicle occupants for increased safety. Our research focuses on two EV battery systems: Granular Battery Assembly (GBA) and Topologically Interlocked Battery Assembly (TIBA). In GBA, the term “Granular” originated from the recent findings on the granular mechanics. Parab et al. [1] demonstrated the fundamental mechanism of impact energy dissipation with …
Using Geometrically, Topologically And Materially Unstructured Methods To Reduce Mesh Dependency In Dynamic Cohesive Fracture Simulations, Glaucio Paulino
Using Geometrically, Topologically And Materially Unstructured Methods To Reduce Mesh Dependency In Dynamic Cohesive Fracture Simulations, Glaucio Paulino
Society of Engineering Science 51st Annual Technical Meeting
We present a method to reduce mesh bias in dynamic fracture simulations using the finite element method with adaptive insertion of extrinsic cohesive zone elements along element boundaries. The geometry of the domain discretization is important in this setting because cracks are only allowed to propagate along element facets and can potentially bias the crack paths. To reduce mesh bias, we consider geometrically unstructured polygonal finite elements in this study. To overcome the problem of limited crack paths, and to significantly improve crack patterns, we propose adaptive refinement [1] and adaptive element splitting [2], increasing the number of potential crack …
Computational Homogenization Of The Debonding Of Rigid-Particle Reinforced Elastomers: Considering Interphases, Daniel Spring, Glaucio Paulino
Computational Homogenization Of The Debonding Of Rigid-Particle Reinforced Elastomers: Considering Interphases, Daniel Spring, Glaucio Paulino
Society of Engineering Science 51st Annual Technical Meeting
When a particle inclusion is embedded in a polymer matrix, the polymer tends to adsorb on the surface of the inclusion. The effect of this may result in an interphasial zone between the particle and the polymer often referred to as “bound” rubber. The extent and composition of this zone depends on a number of factors, including the surface area and surface treatment of the particle, as well as the level of mixing and age of the composite [1]. Studies on the failure of particle reinforced polymers have indicated that, at large strains, cracks/debonding (occurring at the microscale) can have …
Simulation Of The Microlevel Damage Evolution In Polymer Matrix Composites, Masoud Safdari, Ahmad Raeisi Najafi, Nancy R. Sottos, Philippe H. Geubelle
Simulation Of The Microlevel Damage Evolution In Polymer Matrix Composites, Masoud Safdari, Ahmad Raeisi Najafi, Nancy R. Sottos, Philippe H. Geubelle
Society of Engineering Science 51st Annual Technical Meeting
A 3D Isogeometric Interface-Enriched Generalized Finite Element Method (IIGFEM) is developed to analyze problems with complex, discontinuous gradient fields commonly observed in the structural analysis of heterogeneous materials including polymer matrix composites [1]. In the proposed approach, the mesh generation process is significantly simplified by utilizing simple structured meshes that do not conform to the complex microstructure of the heterogeneous media. Non-Uniform Rational B-Splines, commonly used in computer-aided design, are adopted in the IIGFEM to augment the finite element approximation space and capture the weak discontinuity present along material interfaces. The IIGFEM offers many advantages, such as the simplicity and …
Cavitation In Rubber: An Elastic Instability Or A Fracture Phenomenon?, Victor Lefevre, Oscar Lopez-Pamies, Krishnaswamy Ravi-Chandar
Cavitation In Rubber: An Elastic Instability Or A Fracture Phenomenon?, Victor Lefevre, Oscar Lopez-Pamies, Krishnaswamy Ravi-Chandar
Society of Engineering Science 51st Annual Technical Meeting
It is by now well established that loading conditions with sufficiently large triaxialities can induce the sudden -appearance of internal cavities within elastomeric (and other soft) solids. The occurrence of such a phenomenon, commonly referred to as cavitation, can be attributed to the growth of pre-existing defects into finite sizes. In the first part of this discussion, I will present a new theory within the context of nonlinear elasticity to study the phenomenon of cavitation in rubber that contrary to earlier approaches: (i) allows to consider general 3D loading conditions with arbitrary triaxiality; (ii) applies to general classes of nonlinear …
Crack Propagation In Bone At The Microscale: Effect Of The Interfibrillar Glue Molecules With Sacrificial Bonds And Hidden Length, Wenyi Wang
Society of Engineering Science 51st Annual Technical Meeting
Sacrificial bonds and hidden length (SBHL) in structural molecules provide a mechanism for energy dissipation at the nanoscale. It is hypothesized that their presence leads to greater fracture toughness than what is observed in synthetic materials without such features. Here, we investigate this hypothesis using a simplified model of a mineralized collagen fibril sliding on a polymeric interface with SBHL systems. A 1D coarse-grained nonlinear spring-mass system is used to model the fibril. Rate-and-displacement constitutive equations are used to describe the mechanical properties of the polymeric system. The model quantifies how the interface toughness increases as a function of polymer …
Coupling Discrete Dislocation Dynamics With Polycrystal Plasticity, Richard Lesar, Anthony Rollett
Coupling Discrete Dislocation Dynamics With Polycrystal Plasticity, Richard Lesar, Anthony Rollett
Society of Engineering Science 51st Annual Technical Meeting
Lebensohn et al. [1] recently introduced an alternative description of crystal plasticity based on a fast-Fourier transform (FFT) algorithm. The FFT approach solves for the equilibrium stress and strains under the constraint of strain compatibility for systems with periodic microstructures. As currently developed, the FFT model describes plasticity with a set of elasto-viscoplastic constitutive relations for deformation at the single-grain level. The EVP constitutive relation represents an average deformation and cannot describe the details of the dislocation microstructures, such as pileups near boundaries that can serve as stress concentrators or the development of -correlations between dislocation structures and local grain …
Hierarchical Multiscale Method For Coupled Mechano-Electronic Modeling Of Semiconducting Nanomaterials, Arif Masud, Vignesh Kannan
Hierarchical Multiscale Method For Coupled Mechano-Electronic Modeling Of Semiconducting Nanomaterials, Arif Masud, Vignesh Kannan
Society of Engineering Science 51st Annual Technical Meeting
This discussion presents a hierarchical multiscale framework that furnishes a two-level statement of the problem and facilitates simultaneous resolution of quasi-continuum and atomistic length scales in a unified manner. Interatomic interactions are incorporated in the method through a set of analytical equations that contain nanoscale-based material moduli. These material moduli are defined via internal variables that are functions of the local atomic configuration parameters. Point defects like vacancy defects in nanomaterials perturb the atomic structure locally and generate localized force fields. Formation energy of vacancy is evaluated via interatomic potentials and minimization of this energy leads to nanoscale force field …
Failure Of Two Porous Sandstones Under True Triaxial Conditions, John Rudnicki, Xiaodong Ma, Bezalel Haimson
Failure Of Two Porous Sandstones Under True Triaxial Conditions, John Rudnicki, Xiaodong Ma, Bezalel Haimson
Society of Engineering Science 51st Annual Technical Meeting
The role of the intermediate principal stress in rock failure has been a subject of continuing debate since the pioneering work of Mogi in the 1960s with true triaxial tests. These are tests in which all three principal stresses are different, ,, positive in compression. In recent years, an increase in data from such tests, some at constant Lode angle and/or constant mean stress, has provided additional fodder for discussion. Here, we analyze the results of tests on true triaxial data from two porous sandstones, Coconino [1] and Bentheim [2]. The tests are of two types: conventional tests which are …
Mechanics Of Bioinspired Flexible Composites: Experiments, -Simulations, And Analytical Solutions, Stephan Rudykh, Mary Boyce
Mechanics Of Bioinspired Flexible Composites: Experiments, -Simulations, And Analytical Solutions, Stephan Rudykh, Mary Boyce
Society of Engineering Science 51st Annual Technical Meeting
Motivated by designing bioinspired flexible armor, we study deformable layered materials reminiscent of the structures present on teleost fish species (e.g., zebrafish Danio rerio and Arapaima gigas) [1]. These materials comprise soft matrix and stiff layers. The overlapping stiff scales are embedded in a soft tissue such that the composite material can provide protection while also undergoing large deformations when subjected to a penetrating loading (such as a bullet, knife, or a powerful animal bite). Moreover, the layered materials hold a great potential for a large variety of applications including noise reduction [2] and actuation [3]. Here, we analyze the …
Mythbusting Scientific Knowledge Transfer With Nanohub.Org, Gerhard Klimeck
Mythbusting Scientific Knowledge Transfer With Nanohub.Org, Gerhard Klimeck
Society of Engineering Science 51st Annual Technical Meeting
Gordon Moore’s 1965 prediction of continued semiconductor device down-scaling and circuit up-scaling has become a self-fulfilling prophesy in the past 40 years. Open source code development and sharing of the process modeling software SUPREM and the circuit modeling software SPICE were two critical technologies that enabled the down-scaling of semiconductor devices and up-scaling of circuit complexity. SPICE was originally a teaching tool that transitioned into a research tool, was disseminated by an inspired engineering professor via tapes, and improved by users who provided constructive feedback to a multidisciplinary group of electrical engineers, physicist, and numerical analysts. Ultimately SPICE and SUPREM …
Cloud Computing In Nanohub Powering Education And Research, Marisol Koslowski, A. Strachan, M Hunt, Lei Cao
Cloud Computing In Nanohub Powering Education And Research, Marisol Koslowski, A. Strachan, M Hunt, Lei Cao
Society of Engineering Science 51st Annual Technical Meeting
We present a tool that uses a phase field approach to simulate plastic deformation in nanocrystalline materials. It captures the competing grain-boundary and dislocation-mediated deformation mechanisms that govern plastic deformation in these materials. The model is based on a multiphase field approach in which dislocations and grain boundary sliding are represented by means of scalar phase fields described in “The role of grain boundary energetics on the maximum strength of nanocrystalline Ni”, Koslowski, Lee and Lei, Journal of the Mechanics and Physics of Solids, 59 1427–1436, 2011. The tool enables users to quantify how uncertainties in the input parameters (materials …
Pic/Mcc Simulations Of Field Emission Driven Microdischarges, Siva Sashank Tholeti, Alina Alexeenko
Pic/Mcc Simulations Of Field Emission Driven Microdischarges, Siva Sashank Tholeti, Alina Alexeenko
Society of Engineering Science 51st Annual Technical Meeting
The aerodynamic flow control using plasma has been shown to demonstrate great ability with potential applications in both subsonic and supersonic flow regimes [1]. In the past, both numerical and experimental work has been done on dielectric barrier discharges (DBD) as a plasma actuator of cm and mm scale [2]. The plasma, which is ionized gas with free electrons and ions, in cm–mm scale plasma actuators, is generated when sufficient electric filed passes through the gas to ionize it. Typically thousands of volts of potential is required to create high electric fields which then accelerate electrons to create ions by …
Propagating Waves In Bounded Elastic Media: A Transition From Standing Wave Motion To Anguilliform Kinematics, Sophie Ramananarivo, Benjamin Thiria, Godoy-Diana
Propagating Waves In Bounded Elastic Media: A Transition From Standing Wave Motion To Anguilliform Kinematics, Sophie Ramananarivo, Benjamin Thiria, Godoy-Diana
Society of Engineering Science 51st Annual Technical Meeting
Waves propagating in confined geometries usually evolve into spatially stationary patterns, built from the interference between the waves that have been reflected upon hitting the boundaries. However, a recent study on bio-locomotion [1] has reported that traveling wave kinematics can naturally emerge in a forced elastic rod, even with boundary conditions involving significant reflections. It has been shown that this particular behavior is observed only in the presence of strong damping. Based on those observations, we aim at giving a quantitative description of the mechanism involved to prevent the built-up of standing waves and establish traveling fish-like kinematics (that optimizes …
Paramecia Swimming In Viscous Flow, Sunny Jung, Peng Zhang, Saikat Jana, Matt Giarra, Vlachos Pavlos
Paramecia Swimming In Viscous Flow, Sunny Jung, Peng Zhang, Saikat Jana, Matt Giarra, Vlachos Pavlos
Society of Engineering Science 51st Annual Technical Meeting
Swimming and feeding behaviors of Paramecium multimicronucleatum with fore-aft asymmetric body shapes are studied both experimentally and numerically. Ciliates, like Paramecia, with fore-aft asymmetric shapes preferentially swim along the slender anterior while feeding fluid into the oral groove located at the center of the body. Because both feeding and swimming are governed by fluid flow, it is important to reveal the role of fluid mechanics around a fore-aft asymmetric body. However, to date, Paramecia’s preferred swimming direction has not been investigated in detail and its potential benefits are not understood. In this study, we employ microparticle image velocimetry (µ-PIV) to …
Preliminary Testing Of Plasma-Induced Combustion, Ahmed Thalib Razi, Carson Slabaugh, Robert Lucht
Preliminary Testing Of Plasma-Induced Combustion, Ahmed Thalib Razi, Carson Slabaugh, Robert Lucht
The Summer Undergraduate Research Fellowship (SURF) Symposium
Plasma-induced combustion (PIC) has been shown to improve the reliability, efficiency, and delay time of ignition in flight systems like augmentors and scramjets. These high-velocity systems are mostly used in military applications, and improvement may help commercial viability. To understand this chemical process, the concentration of radicals, particularly H radicals, must be tracked through the flame using laser diagnostics. This requires a steady source of plasma-assisted combustion to be secured and well-understood. A plasma torch flowing partially premixed air and methane was installed and successfully operated, and preliminary testing was carried out. Primarily it was observed that PIC created stable …
The Influence Of Lightweight Aggregate On Internal Curing And Its Impact On Autogenous Shrinkage Of High-Performance Concrete, Neil J. Hartman, Timothy J. Barrett, Jason Weiss
The Influence Of Lightweight Aggregate On Internal Curing And Its Impact On Autogenous Shrinkage Of High-Performance Concrete, Neil J. Hartman, Timothy J. Barrett, Jason Weiss
The Summer Undergraduate Research Fellowship (SURF) Symposium
In bridge deck construction high performance concrete is often desirable, however in practice it is generally susceptible to early-age shrinkage cracking resulting in an overall reduction in service life. This research seeks to assess the potential for reducing early-age shrinkage in new bridge deck construction through the use of internal curing, a process in which internal reservoirs supply water to the hydrating cement paste during the early stages of cement hydration. In North America, internal curing is typically achieved by replacing a portion of the normal fine aggregate with an expanded fine lightweight aggregate (LWA). For this study, the free …
A Wind-Derived Upwelling Index For Lake Michigan, Stephen B. Davis, Rebecca Essig, Cary Troy
A Wind-Derived Upwelling Index For Lake Michigan, Stephen B. Davis, Rebecca Essig, Cary Troy
The Summer Undergraduate Research Fellowship (SURF) Symposium
Coastal upwelling is a phenomenon that occurs along coastlines throughout the world, and has been shown to be strongly correlated with large fish populations in these areas. Coastal upwelling occurs when strong coastal winds drive water transport away from the coast, causing colder, often nutrient-rich water to upwell in its place. While coastal upwellings can be detected with satellite imagery or in situ temperature measurements, these datasets are neither continuous nor long-term. A wind-derived upwelling index was created for Lake Michigan to continuously quantify upwellings over multiple decades, and to allow for further understanding of the impact of upwelling in …
Seedling Uptake And Fate Of Soil-Applied Capsaicin, A Potential Browse Deterrent, Carmen K. Dobbs, Joshua L Sloan, Douglass F. Jacobs
Seedling Uptake And Fate Of Soil-Applied Capsaicin, A Potential Browse Deterrent, Carmen K. Dobbs, Joshua L Sloan, Douglass F. Jacobs
The Summer Undergraduate Research Fellowship (SURF) Symposium
Seedling damage due to browse constitutes a major challenge to afforestation and reforestation efforts in the Central Hardwood Forest region of the USA. Many efforts have been made to deter herbivores, but the costs, implementation methods, and relative ineffectiveness of existing mitigation options often preclude operational implementation. An alternate means of deterring wildlife browse is capsaicin, a hot pepper concentrate, which has been reported to decrease herbivory of tree seedlings and is available in a controlled-release form designed to act systemically following application to the soil and subsequent plant uptake. However, the degree to which seedlings are capable of absorbing …
Measurement Of Zeta Potential Of Polysaccharides And Fabricating Polysaccharide-Polysaccharide Nanotubes, Sandra Chough, Jozef L. Kokini, Luis Maldonado
Measurement Of Zeta Potential Of Polysaccharides And Fabricating Polysaccharide-Polysaccharide Nanotubes, Sandra Chough, Jozef L. Kokini, Luis Maldonado
The Summer Undergraduate Research Fellowship (SURF) Symposium
Biopolymer nanotubes (BNTs) are two-open ended cylindrical structures which can be used for nanodevices, medicine, and biology. Especially, fabricating BNTs using proteins is suitable for biological and biomedical applications due to their safety and biocompatibility. This study has been focused on fabricating BNTs using polysaccharides which have been proved to be safe by the FDA and used in food applications. The zeta-potential, surface charge, of different polysaccharides was measured to find the region of stability and isoelectric point from pH 4 to 11 by DLS. Next, xanthan and chitosan have been selected for fabricating BNTs because of their stability and …
The Effect Of Transient Hmg-Coa Reductase And 1-Deoxy-D-Xylulose-5-Phosphate Synthase Overexpression On Terpene Production In Transgenic Tomato Fruits, Scott A. Gentry, Michael Gutensohn, Laura Henry, Natalia Dudareva
The Effect Of Transient Hmg-Coa Reductase And 1-Deoxy-D-Xylulose-5-Phosphate Synthase Overexpression On Terpene Production In Transgenic Tomato Fruits, Scott A. Gentry, Michael Gutensohn, Laura Henry, Natalia Dudareva
The Summer Undergraduate Research Fellowship (SURF) Symposium
Isoprenoids are secondary metabolites that control numerous plant functions including signaling, growth, photosynthesis, and membrane structure. The bioengineering of isoprenoid synthesis could produce plants with a variety of beneficial traits. Plants form isoprenoids using two different pathways, the mevalonate (MVA) pathway and the methylerithritol phosphate (MEP) pathway, which cooperate via metabolic cross-talk. Transgenic tomato lines expressing both the plastidic and cytosolic forms of the snapdragon nerolidol/linalool terpene synthase under a fruit ripening specific promoter were transiently transformed to overexpress key enzymes in the two isoprenoid pathways. Hydroxymethylglutaryl-coenzyme A reductase (HMGR) is the rate limiting enzyme in the MVA pathway that …
Designing Constructed Wetlands For Water Purification In Tanzania, Danielle Mcneely, Michael Sheehan, John Lumkes
Designing Constructed Wetlands For Water Purification In Tanzania, Danielle Mcneely, Michael Sheehan, John Lumkes
The Summer Undergraduate Research Fellowship (SURF) Symposium
In Tanzania half of households have unsafe drinking water (Nkonya, 2010) and many diseases arise from poor water quality, including meningitis, hepatitis A and E, and salmonella (Kusiluka et al., 2004). One cost-effective way of cleaning water is by passing it through a wetland. This research is focused on simplifying the process of horizontal subsurface flow wetland construction for the villagers of Endallah. The outcome is an Excel tool that standardizes methodology for building wetlands that can then be applied to Endallah. Rainfall data from the Arusha region of Tanzania was used to make a rainfall estimation grid. From this …
The Simulation Of Resonant Tunneling Diodes, Woodrow A. Gilbertson, Pengyu Long, Jim Fonseca, Gerhard Klimeck
The Simulation Of Resonant Tunneling Diodes, Woodrow A. Gilbertson, Pengyu Long, Jim Fonseca, Gerhard Klimeck
The Summer Undergraduate Research Fellowship (SURF) Symposium
The goal of this project is to improve the simulation of an electrical device known as a Resonant Tunneling Diode (RTD). Diodes are in most electronic devices today, but RTDs have 10 times greater switching speeds than regular diodes. This increase in efficiency would have impacts from supercomputers to the next big cell phone. The increased functionality of the simulation tool will come from implementing more recent mathematical solvers and modeling techniques. The simulation tool makes use of a variant of Non-Equilibrium Green Functions (NEGF) with an effective mass approximation. The two contacts are treated as equilibrium regions and the …