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Full-Text Articles in Other Engineering

Level Of Service And The Transit Neighbourhood: Observations From Dublin City And Surburbs, David O'Connor, Brian Caulfield Jan 2019

Level Of Service And The Transit Neighbourhood: Observations From Dublin City And Surburbs, David O'Connor, Brian Caulfield

Articles

Few studies have looked at the impact Level-of-Service (LOS) might have on the distances people walk to public transport. The relationship, if any, has implications for transit-oriented-development and the viability of different transit modes serving suburban areas. This paper examines pedestrian catchment areas and LOS across a light rail, a metro rail and two bus corridors in Dublin. Public transport users have been surveyed at 17 stops around the city and their trip origin identified. Catchment areas for bus services with high levels of service were found to be comparable and often greater than those for LRT or metro rail ...


Landslides Near Enguri Dam (Caucasus, Georgia) And Possible Seismotectonic Effects, Alessandro Tibaldi, Paolo Oppizzi, John S. Gierke, Thomas Oommen, Nino Tsereteli, Zurab Gogoladze Jan 2019

Landslides Near Enguri Dam (Caucasus, Georgia) And Possible Seismotectonic Effects, Alessandro Tibaldi, Paolo Oppizzi, John S. Gierke, Thomas Oommen, Nino Tsereteli, Zurab Gogoladze

Department of Geological and Mining Engineering and Sciences Publications

The Enguri dam and water reservoir, nested in the southwestern Caucasus (Republic of Georgia), are surrounded by steep mountain slopes. At a distance of 2.5 km from the dam, a mountain ridge along the reservoir is affected by active deformations with a double vergence. The western slope, directly facing the reservoir, has deformations that affect a subaerial area of 1.2 km2. The head scarp affects the Jvari–Khaishi–Mestia main road with offsets of man-made features that indicate slip rates of 2–9 cm yr−1. Static, pseudostatic and Newmark analyses, based on field and seismological data ...


Assessment Of Post-Wildfire Debris Flow Occurrence Using Classifier Tree, Priscilla Addison, Thomas Oommen, Qiuying Sha Jan 2019

Assessment Of Post-Wildfire Debris Flow Occurrence Using Classifier Tree, Priscilla Addison, Thomas Oommen, Qiuying Sha

Department of Geological and Mining Engineering and Sciences Publications

Besides the dangers of an actively burning wildfire, a plethora of other hazardous consequences can occur afterwards. Debris flows are among the most hazardous of these, being known to cause fatalities and extensive damage to infrastructure. Although debris flows are not exclusive to fire affected areas, a wildfire can increase a location’s susceptibility by stripping its protective covers like vegetation and introducing destabilizing factors such as ash filling soil pores to increase runoff potential. Due to the associated dangers, researchers are developing statistical models to isolate susceptible locations. Existing models predominantly employ the logistic regression algorithm; however, previous studies ...


Engineering Magnetic Properties Of Nanoparticles For Biomedical Applications And Magnetic Thin Film Composite Heterostructures For Device Applications., Shivakumar Hunagund Jan 2019

Engineering Magnetic Properties Of Nanoparticles For Biomedical Applications And Magnetic Thin Film Composite Heterostructures For Device Applications., Shivakumar Hunagund

Theses and Dissertations

The motivation of this study is to investigate the size dependent properties of Gadolinium silicide nanoparticles and their potential applications in Biomedicine. We use two approaches in our investigation - size dependence and possible exchange interaction in a core-shell structure. Past results showed Gd5Si4 NPs exhibit significantly reduced echo time compared to superparamagnetic iron oxide nanoparticles (SPION) when measured in a 7 T magnetic resonance imaging (MRI) system. This indicates potential use of Gd5Si4 ferromagnetic nanoparticles as T2 contrast agents for MRI.

Until recently most contrast agents (CA) that are used in Magnetic Resonance Imaging ...


Autojack - Hydraulic Powertrain System, Tyce Vu Jan 2019

Autojack - Hydraulic Powertrain System, Tyce Vu

All Undergraduate Projects

A primary problem for mechanics and automotive enthusiasts is the risk associated with lifting and securing a vehicle with conventional jack stands. Often times, improper jack-stand installation results in the vehicle collapsing unexpectedly, causing injury and/or death. This problem can be minimized through the application of a newly re-designed vehicle lifting system. The conventional method for lifting cars is time consuming and can be unsafe in many circumstances. A better, safer, and more efficient lift design was needed; the AutoJack. The approach of the AutoJack design was entirely focused on the safety of lifting a vehicle. Safety was improved ...


The Effect Of Behavioral Traits And Background On Engineering Students’ Decision-Making Process Compared To Business Students, Joe Scott Jan 2019

The Effect Of Behavioral Traits And Background On Engineering Students’ Decision-Making Process Compared To Business Students, Joe Scott

Williams Honors College, Honors Research Projects

This paper looks to narrow down the reasons that students undertake new credentials, specifically in sales fields. With a focus on character traits and upbringing, the goal is to ensure that there is a better understanding of the reasons that people undertake these credentials. The different benefits of credentials will be analyzed to determine the most influential reason that people would be willing to move forward. The combination of these factors will be used to provide recommendations of the best way to reach and influence the decision of the engineering students.


Optimizing The Production And Injection Wells Flow Rates In Geothermal Field Using Artificial Intelligence, Muhammet Salih Ariturk Jan 2019

Optimizing The Production And Injection Wells Flow Rates In Geothermal Field Using Artificial Intelligence, Muhammet Salih Ariturk

Graduate Theses, Dissertations, and Problem Reports

In a geothermal field, power plants are designed for long-term electricity generation. Therefore, it is crucial to predict the future production and injection flow rates of the wells to determine the capacity of a power plant. In the designing of such power plants, calculations and estimations are based on the current future production, and injection flow rates and pressures in the geothermal field. Prediction of future production and injection flow rates also assist in building surface facilities with cost-efficient power plants. The most common problem in a power plant in geothermal fields is the inability to accurately estimate future expected ...


Evaluación Del Efecto Antimicrobiano Del Polvo Y Extracto Acuoso Liofilizado De Hojas De Moringa Oleífera En Un Derivado Cárnico (Chorizo Crudo), Natalia Ximena Munevar, Erika Paola Zambrano Orozco Jan 2019

Evaluación Del Efecto Antimicrobiano Del Polvo Y Extracto Acuoso Liofilizado De Hojas De Moringa Oleífera En Un Derivado Cárnico (Chorizo Crudo), Natalia Ximena Munevar, Erika Paola Zambrano Orozco

Ingeniería de Alimentos

El interés en la búsqueda de extractos vegetales que tengan poder antibacteriano frente a microorganismos patógenos, ha permitido que el presente trabajó de investigación tenga como propósito evaluar la actividad antimicrobiana de la extracción acuosa liofilizada y el polvo de las hojas deshidratadas de la especie vegetal Moringa oleífera frente al crecimiento de Staphylococcus aureus. El extracto acuoso se obtuvo por el método de cocción a partir de las hojas deshidratadas, para posteriormente ser sometido a liofilización. El polvo se consiguió moliendo las hojas deshidratadas para disminuir el tamaño de partícula. Se evaluó la actividad antimicrobiana del extracto acuoso liofilizado ...


Propuesta Para La Gestión Del Sistema De Inventarios En La Empresa Decoraciones David’S, David Andrés Mendoza Ochoa Jan 2019

Propuesta Para La Gestión Del Sistema De Inventarios En La Empresa Decoraciones David’S, David Andrés Mendoza Ochoa

Ingeniería Industrial

El presente proyecto se encuentra enfocado en el planteamiento de una propuesta en la gestión de inventarios para la reducción de costos en la empresa Decoraciones David’s S.A.S. Inicialmente, se realiza un diagnostico a traves del análisis de la información existente de modo que se tengan los costos actuales de operación, en especial aquellos relacionados a los inventarios de la compañía. Despues, se clasifican los productos manejados por la compañía junto con su inventario y basado en la demanda se realizan los pronósticos, siguiente a esto se establecen las cantidades a pedir para cada uno de los ...


Desarrollo De Un Producto Derivado De La Papa Criolla Y Su Proceso De Transformación, En La Finca “La Florida” Municipio De Fosca Cundinamarca, Susan Milena Becerra Chingaté, Mabel Arlene Garay Baquero Jan 2019

Desarrollo De Un Producto Derivado De La Papa Criolla Y Su Proceso De Transformación, En La Finca “La Florida” Municipio De Fosca Cundinamarca, Susan Milena Becerra Chingaté, Mabel Arlene Garay Baquero

Ingeniería Industrial

Con este trabajo se pretende desarrollar un producto derivado de la papa criolla que permita aumentar los ingresos recibidos, en la comercialización del cultivo de la papa criolla, para la finca “La Florida” del municipio de Fosca, Cundinamarca y a través de ella al propietario. Actualmente la finca tiene una producción de 3 toneladas anuales de papa criolla, en 1 hectárea de terreno. El cultivo de la papa criolla es el más importante para la finca, debido a que es el que se realiza en mayor cantidad en comparación con los demás. El precio del cultivo es completamente variable en ...


Desarrollo De La Transición A La Norma Iso 9001:2015 Para Contribuir A La Certificación De La Compañía Daimler Colombia S.A., Tania Hisell Corredor Avendaño Jan 2019

Desarrollo De La Transición A La Norma Iso 9001:2015 Para Contribuir A La Certificación De La Compañía Daimler Colombia S.A., Tania Hisell Corredor Avendaño

Ingeniería Industrial

Daimler Colombia S.A. es una compañía filial de la multinacional Daimler AG en Colombia y representante de las marcas Mercedes-Benz, Freightliner, y Fuso. En el año 2014 la compañía obtuvo la certificación de calidad en ISO 9001:2008 la cual se venció en el año 2017, de igual manera la norma fue actualizada a la versión ISO 9001:2015 por lo cual la compañía tiene el plan de obtener la certificación en la última versión. El proceso de certificación comienza con el análisis de las actualizaciones a realizar en el Sistema de Gestión de Calidad el cual debe ser ...


Desarrollo De Un Artefacto Que Aumenta La Productividad En Procesos De Siembra Y/O Cosecha De Cultivos De Papa En Chiquinquirá, Boyacá, Diana Alejandra Olmos Puerto, Liceth Katherine Villamil Martínez Jan 2019

Desarrollo De Un Artefacto Que Aumenta La Productividad En Procesos De Siembra Y/O Cosecha De Cultivos De Papa En Chiquinquirá, Boyacá, Diana Alejandra Olmos Puerto, Liceth Katherine Villamil Martínez

Ingeniería Industrial

El proyecto de investigación tiene como fin, identificar una propuesta que mejore la calidad de vida del campesino colombiano residente en la ciudad de Chiquinquirá - Boyacá, a su vez optimizar el trabajo desarrollado en los cultivos de papa, en procesos de siembra y/o cosecha del tubérculo, utilizando como método la creación de un artefacto para darle sustitución a la herramienta de uso diario del agricultor llamada gancho. El objetivo del estudio del proyecto tiene como finalidad ayudar en el bienestar de la salud del agricultor a través de la ergonomía, la productividad por surco y la progreso de tiempos ...


Formulación De Una Propuesta Para La Programación De Horarios En El Colegio Sagrado Corazón, Leidy Ximena López Roa, Angie Milady Fino Ramos Jan 2019

Formulación De Una Propuesta Para La Programación De Horarios En El Colegio Sagrado Corazón, Leidy Ximena López Roa, Angie Milady Fino Ramos

Ingeniería Industrial

Este trabajo presenta una propuesta de solución a un problema de timetabling que se deriva de la generación de horarios escolares para el colegio Sagrado Corazón considerando una estructura curricular particular ya que cuenta con diferentes líneas de estudio por el énfasis del proyecto educativo institucional (PEI), además de la oferta completa de niveles escolares formales, múltiples sedes, rotación de profesores con base a la especialización de estudios, y variación en los tiempos correspondientes a los grupos de primaria, básica secundaria y media vocacional. En el desarrollo de la investigación se formula un modelo matemático de programación entera mixta donde ...


Evaluation Of Ultra Fine Cigarette Smoke Particles Penetration On 3m 6200 Half Mask Respirators With P-100 Filters, Selcuk Elhan Jan 2019

Evaluation Of Ultra Fine Cigarette Smoke Particles Penetration On 3m 6200 Half Mask Respirators With P-100 Filters, Selcuk Elhan

Graduate Theses, Dissertations, and Problem Reports

This study was aimed to investigate the effectiveness of half mask respirator with double P-100 filters by determining the penetration of cigarette smoke particles. In this study, faceseal leakage of a breathing manikin donned a 3M 6200 half mask elastomeric respirator with double P-100 filters was determined at various test conditions. A full factorial test conditions of 4 sealing conditions (Non-sealed, only nose sealed, nose and chin sealed, and fully sealed), 2 inspiratory breathing types (Constant, cyclic), 4 flowing rates (15, 30, 50, 85 L/min for cyclic; 15, 30, 50, 80 L/min for constant) were employed and each ...


Efficient Excitation Of Micro/Nano Resonators And Their Higher Order Modes, N. Jaber, M. A. A. Hafiz, S. N. R. Kazmi, M. H. Hasan, F. Alsaleem, S. Ilyas, M. I. Younis Jan 2019

Efficient Excitation Of Micro/Nano Resonators And Their Higher Order Modes, N. Jaber, M. A. A. Hafiz, S. N. R. Kazmi, M. H. Hasan, F. Alsaleem, S. Ilyas, M. I. Younis

Architectural Engineering -- Faculty Publications

We demonstrate a simple and flexible technique to efficiently activate micro/nano-electromechanical systems (MEMS/NEMS) resonators at their fundamental and higher order vibration modes. The method is based on the utilization of the amplified voltage across an inductor, L, of an LC tank resonant circuit to actuate the MEMS/NEMS resonator. By matching the electrical and mechanical resonances, significant amplitude amplification is reported across the resonators terminals. We show experimentally amplitude amplification up to twelve times, which is demonstrated to efficiently excite several vibration modes of a microplate MEMS resonator and the fundamental mode of a NEMS resonator.


The Role Of Stakeholders After Development Of The Baseline Scheduled Maintenance Program, Danita Baghdasarin Jan 2019

The Role Of Stakeholders After Development Of The Baseline Scheduled Maintenance Program, Danita Baghdasarin

International Journal of Aviation, Aeronautics, and Aerospace

The principles of systems engineering can be applied to various aviation systems. This position paper emphasizes the importance of stakeholder collaboration in the various stages of the system life cycle, where the system is the aircraft scheduled maintenance program and the stakeholders are the constituents of the Industry Steering Committee (ISC): regulatory authorities, original equipment manufacturers (OEMs), and operators. The author discusses accidents with maintenance-related contributing factors, and highlights opportunities to improve coordination among stakeholders in order to ensure safe and effective maintenance.


Voltage And Deflection Amplification Via Double Resonance Excitation In A Cantilever Microstructure, Mohammad H. Hasan, Fadi Alsaleem, Abdallah Ramini Jan 2019

Voltage And Deflection Amplification Via Double Resonance Excitation In A Cantilever Microstructure, Mohammad H. Hasan, Fadi Alsaleem, Abdallah Ramini

Architectural Engineering -- Faculty Publications

Cantilever electrostatically-actuated resonators show great promise in sensing and actuating applications. However, the electrostatic actuation suffers from high-voltage actuation requirements and high noise low-amplitude signal-outputs which limit its applications. Here, we introduce a mixed-frequency signal for a cantilever-based resonator that triggers its mechanical and electrical resonances simultaneously, to overcome these limitations. A single linear RLC circuit cannot completely capture the response of the resonator under double resonance excitation. Therefore, we develop a coupled mechanical and electrical mathematical linearized model at different operation frequencies and validate this model experimentally. The double-resonance excitation results in a 21 times amplification of the voltage ...


Experiencing Extreme Height For The First Time: The Influence Of Height, Self-Judgment Of Fear And A Moving Structural Beam On The Heart Rate And Postural Sway During The Quiet Stance, Mahmoud Habibnezhad, Jay Puckett, M. S. Fardhosseini, Houtan Jebelli, Terry Stentz, L. A. Pratama Jan 2019

Experiencing Extreme Height For The First Time: The Influence Of Height, Self-Judgment Of Fear And A Moving Structural Beam On The Heart Rate And Postural Sway During The Quiet Stance, Mahmoud Habibnezhad, Jay Puckett, M. S. Fardhosseini, Houtan Jebelli, Terry Stentz, L. A. Pratama

Architectural Engineering -- Faculty Publications

Falling from elevated surfaces is the main cause of death and injury at construction sites. Based on the Bureau of Labor Statistics (BLS) reports, an average of nearly three workers per day suffer fatal injuries from falling. Studies show that postural instability is the foremost cause of this disproportional falling rate. To study what affects the postural stability of construction workers, we conducted a series of experiments in the virtual reality (VR). Twelve healthy adults—all students at the University of Nebraska-Lincoln—were recruited for this study. During each trial, participants’ heart rates and postural sways were measured as the ...


Calculation Of Critical Water Flow Rates For Wildfire Suppression, Greg Penney, Daryoush Habibi, Marcus Cattani, Murray Carter Jan 2019

Calculation Of Critical Water Flow Rates For Wildfire Suppression, Greg Penney, Daryoush Habibi, Marcus Cattani, Murray Carter

ECU Publications Post 2013

Predicting water suppression requirements and its impacts on firefighting strategies and logistics within the urban environment has been the subject of many previous studies, however the same level of research has yet to be applied in the realm of wildfire suppression. To work towards addressing this knowledge gap, this paper provides guidance for Incident Controllers in relation to critical water flow rates required to extinguish large wildfire across a wide range of forest fuel loads, fire weather and active fire front depths. This is achieved through mathematical empirical analysis of water flow rates required for head fire suppression during 540 ...


Digital Forensic Tools & Cloud-Based Machine Learning For Analyzing Crime Data, Majeed Kayode Raji Dec 2018

Digital Forensic Tools & Cloud-Based Machine Learning For Analyzing Crime Data, Majeed Kayode Raji

Electronic Theses and Dissertations

Digital forensics is a branch of forensic science in which we can recreate past events using forensic tools for legal measure. Also, the increase in the availability of mobile devices has led to their use in criminal activities. Moreover, the rate at which data is being generated has been on the increase which has led to big data problems. With cloud computing, data can now be stored, processed and analyzed as they are generated. This thesis documents consists of three studies related to data analysis. The first study involves analyzing data from an android smartphone while making a comparison between ...


Call For Abstracts - Resrb 2019, July 8-9, Wrocław, Poland, Wojciech M. Budzianowski Dec 2018

Call For Abstracts - Resrb 2019, July 8-9, Wrocław, Poland, Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Monitoring The Impact Of Groundwater Pumping On Infrastructure Using Geographic Information System (Gis) And Persistent Scatterer Interferometry (Psi), Kirsten Deprekel, El Hachemi Bouali, Thomas Oommen Dec 2018

Monitoring The Impact Of Groundwater Pumping On Infrastructure Using Geographic Information System (Gis) And Persistent Scatterer Interferometry (Psi), Kirsten Deprekel, El Hachemi Bouali, Thomas Oommen

Department of Geological and Mining Engineering and Sciences Publications

Transportation infrastructure is critical for the advancement of society. Bridges are vital for an efficient transportation network. Bridges across the world undergo variable deformation/displacement due to the Earth’s dynamic processes. This displacement is caused by ground motion, which occurs from many natural and anthropogenic events. Events causing deformation include temperature fluctuation, subsidence, landslides, earthquakes, water/sea level variation, subsurface resource extraction, etc. Continual deformation may cause bridge failure, putting civilians at risk, if not managed properly. Monitoring bridge displacement, large and small, provides evidence of the state and health of the bridge. Traditionally, bridge monitoring has been executed ...


The Nature Of Ephemeral Secrets In Reverse Engineering Tasks, Antonio Miguel Espinoza Dec 2018

The Nature Of Ephemeral Secrets In Reverse Engineering Tasks, Antonio Miguel Espinoza

Computer Science ETDs

Reverse engineering is typically carried out on static binary objects, such as files or compiled programs. Often the goal of reverse engineering is to extract a secret that is ephemeral and only exists while the system is running. Automation and dynamic analysis enable reverse engineers to extract ephemeral secrets from dynamic systems, obviating the need for analyzing static artifacts such as executable binaries.

I support this thesis through four automated reverse engineering efforts: (1) named entity extraction to track Chinese Internet censorship based on keywords; (2) dynamic information flow tracking to locate secret keys in memory for a live program ...


Transverse Anderson Localization In Optical Fibers: High-Quality Wave Transmission And Novel Lasing Applications, Behnam Abaie Dec 2018

Transverse Anderson Localization In Optical Fibers: High-Quality Wave Transmission And Novel Lasing Applications, Behnam Abaie

Optical Science and Engineering ETDs

In this dissertation, transverse Anderson localization (TAL) of light mediated by disordered optical fibers is exploited for high-quality optical wave transmission and novel random lasing applications. En route, we first establish a powerful numerical platform for detailed investigation of TAL optical fibers (TALOF). Our approach is based on a modal perspective as opposed to beam propagation method (BPM) which was primarily used in the previous studies of TAL in disordered optical fibers. The versatile numerical tools developed in our simulations result in a potent methodology for simulation of TALOFs; the result is a fast and effective algorithm which can be ...


An Overpayment And Improved Reconciliation Process, Logan Wright Dec 2018

An Overpayment And Improved Reconciliation Process, Logan Wright

Honors Theses

Managerial errors in the form of late entry separations result in operating inefficiencies and excess costs to a company, as reconciliations will need to occur between paychecks issued and active employees versus separated employees. This is an issue that is currently plaguing Whirlpool Corporation (Whirlpool) in their U.S. operations. After the implementation of a plan to restructure their Human Resources (HR) Department and payroll unit to achieve HR Excellence, Whirlpool experienced problems with their payroll process resulting in inaccurate payments to separated employees. This senior project designed a two-phase process, first phase being prevention and second phase being a ...


Effect Of Aerogel On The Thermal Performance Of Corrugated Composite Sandwich Structures, Jacob Dillon Chess Dec 2018

Effect Of Aerogel On The Thermal Performance Of Corrugated Composite Sandwich Structures, Jacob Dillon Chess

Master's Theses and Project Reports

Current insulation solutions across multiple industries, especially the commercial sector, can be bulky and ineffective when considering their volume. Aerogels are excellent insulators, exhibiting low thermal conductivities and low densities with a porosity of around 95%. Such characteristics make aerogels effective in decreasing conductive heat transfer within a solid. These requirements are crucial for aerospace and spaceflight applications, where sensitive components exist among extreme temperature environments. When implemented into insulation applications, aerogel can perform better than existing technology while using less material, which limits the amount of volume allocated for insulation. The application of these materials into composites can result ...


Electrical Characterization Of Graphene And Nanodiamond Nanostructures, A Z M Nowzesh Hasan Nov 2018

Electrical Characterization Of Graphene And Nanodiamond Nanostructures, A Z M Nowzesh Hasan

Doctoral Dissertations

The electrical characterization on two-dimensional carbon-based graphene and nanodiamond materials was performed to improve charge transport properties for the label-free electrical biosensors. The charge transport in solution-gated graphene devices is affected by the impurities and disorders of the underlying dielectric interface and its interaction with the electrolytes. Advancement in field-effect ion sensing by introducing a dielectric isomorph, hexagonal boron nitride between graphene and silicon dioxide of a solution-gated graphene field-effect transistor was investigated. Increased transconductance due to increased charge carrier mobility is accompanied with larger ionic sensitivity. These findings define a standard to construct future graphene devices for biosensing and ...


Multidimensional Feature Engineering For Post-Translational Modification Prediction Problems, Norman Mapes Jr. Nov 2018

Multidimensional Feature Engineering For Post-Translational Modification Prediction Problems, Norman Mapes Jr.

Doctoral Dissertations

Protein sequence data has been produced at an astounding speed. This creates an opportunity to characterize these proteins for the treatment of illness. A crucial characterization of proteins is their post translational modifications (PTM). There are 20 amino acids coded by DNA after coding (translation) nearly every protein is modified at an amino acid level. We focus on three specific PTMs. First is the bonding formed between two cysteine amino acids, thus introducing a loop to the straight chain of a protein. Second, we predict which cysteines can generally be modified (oxidized). Finally, we predict which lysine amino acids are ...


Engineered Coating Of Natural Fibers And Oil-Water Interfaces With Self-Assembly Of Clay Nanotubes, Abhishek Panchal Nov 2018

Engineered Coating Of Natural Fibers And Oil-Water Interfaces With Self-Assembly Of Clay Nanotubes, Abhishek Panchal

Doctoral Dissertations

Taking into consideration two different types of surfaces, this dissertation proposes techniques to coat the surface of natural fibers and oil-water interfaces by spontaneous self-assembly of halloysite clay nanotubes. The material of choice, halloysite clay, is a widely available natural resource and can be used after minimal processing. In regards to chemical composition, halloysite clay resembles aluminosilicate mineral kaolin; physically, a defect in the crystal structure ordering causes the sheets of kaolinite to roll into halloysite nanotubes. The dimensions of halloysite nanotubes are dependent on the source, but generally vary from 200 nm to 3 µm in length, 100-150 nm ...


Effective Magnetic And Electric Response Of Composite Materials, Mona Hassan Alsaleh Nov 2018

Effective Magnetic And Electric Response Of Composite Materials, Mona Hassan Alsaleh

Doctoral Dissertations

Metamaterials (MMs) are nanocomposite materials consisting of metal-dielectric resonators much smaller in size than the wavelength of the incident light. Common examples of metamaterials are based on split ring resonators (SRRs), parallel wires or strips and fishnet structures. These types of materials are designed and fabricated in order to provide unique optical responses to the incident electromagnetic radiation that are not available in naturally existing materials. The MMs can exhibit unusual properties such as strong magnetism at terahertz (THz) and optical frequencies. Additionally, negative index materials (NIMs) can provide negative index of refraction which can be used in many applications ...