WWW.DISSERTATION.XLIBX.INFO
FREE ELECTRONIC LIBRARY - Dissertations, online materials
 
<< HOME
CONTACTS



Pages:     | 1 |   ...   | 59 | 60 || 62 | 63 |   ...   | 112 |

«Strengthening the Nation through Diversity, Innovation & Leadership in STEM San Antonio,Texas · October 3-6, 2013 Get Connected! Connect with the ...»

-- [ Page 61 ] --

1 The Microsystem Fabrication Laboratory at the Naval Post Graduate School (NPS) focuses on the fabrication of microelectromechanical systems (MEMS). We report on the development of a microfabrication process of a terahertz metamaterial developed to absorb high levels of THz radiation. The metamaterial was designed to 1) be simple and low-cost to implement, 2) match the resonant frequency of the illumination source while providing structural support, 3) maintain thermomechanical properties, and 4) provide optical read-out access. The design consists of a periodic array of aluminum squares separated from a homogenous aluminum (Al) ground plane by a thin film of SU-8 photoresist (dielectric layer). This metamaterial acts as an absorbing portion of a THz detector. Absorbed incident THz radiation by a detector in the absorbing structure of the metamaterial transforms it into heat that transfers to detector’s bimaterial legs. Consequently, the detector’s structure deforms proportionally to the absorbed power. Deformation occurs due to the difference in thermal coefficients of Al and SU-8. A quantum cascade laser (QLC) emitting THz radiation is to be used as the illuminating source in the imaging system. Indicative of its flexible design and high sensitivity, further tuning can be achieved by modifying the dimensions of the patterned squares to match the absorption frequency to the illumination source for real-time THz imaging applications for military and medical purposes. We compare the outcome of etching versus the lift-off process for patterning the upper layer of metamaterial, which was implemented previously in search of metamaterial microfabrication optimization.

SAT-287

INTEGRATION OF NATURAL DYE, ANTHOCYANIN, INTO SOLID-STATE SOLAR CELLS

Eduardo Valle, Aliaksandr Zaretski, Darren Lipomi.

University of California, San Diego, La Jolla, CA.

Anthocyanins are small molecules that are responsible for the dark purple to bright red colors of many fruits and vegetables. The major role of anthocyanins in plants is to absorb specific wavelengths of sunlight, from 520 nm to the ultraviolet. In doing so, they protect the plant from solar damage. This photosynthesizing property of anthocyanins has caught the attention of the solar cell community and has led to the development of dye-sensitized solar cells (DSSC) that use anthocyanins as the electron donor, hole producer in the cell’s active layer. Current DSSCs have been able to achieve high efficiencies (~12%). The problem with DSSCs is that the electrolytic fluid cannot be preserved for long periods of time. Our goal is to create a solid organic solar cell (OSC) using anthocyanins paired with an electronaccepting compound to overcome the obstacle presented by the electrolyte. We start by extracting and purifying anthocyanins from purple corn, a crop that can be grown over large areas in many climates, via vacuum filtration and column chromatography. The purified anthocyanin (a p-type semiconductor) is then spin-coated onto glass bearing a layer of a transparent conductive polymer. An n-type small molecule is spin-coated on top of the anthocyanin layer, and a drop of eutectic gallium-indium as the top electrode completes the device. The cell will then be placed in a solar simulator to test its performance. Preliminary results suggest that anthocyanin and a derivative of C60 form working solar cells, and we seek to improve them.

FRI-289

HIGH SENSITIVITY METAL-ORGANIC HYBRID TERAHERTZ METAMATERIAL

Azucena Yzquierdo1, Erik Bautista1, Dragoslav Grbovic2.

Hartnell College, Salinas, CA, 2Naval Post Graduate School, Monterey, CA.

1 The Microsystem Fabrication laboratory, at the Naval Post Graduate School (NPS), focuses on the fabrication of microelectromechanical systems (MEMS). We report on the development of a microfabrication process of a terahertz metamaterial developed to absorb high levels of THz radiation. The metamaterial was designed to 1) be simple and low-cost to implement, 2) match the resonant frequency of the illumination source while providing structural

196 UNDERGRADUATE POSTER ABSTRACTS

support, 3) maintain thermomechanical properties, and 4) provide optical read-out access. The design consists of a periodic array of aluminum squares separated from a homogenous aluminum (Al) ground plane by a thin film of SU-8 photoresist (dielectric layer). This metamaterial acts as an absorbing portion of a THz detector. Absorbed incident THz radiation by a detector in the absorbing structure of the metamaterial transforms it into heat that transfers to detector’s bimaterial legs. Consequently, the detector’s structure deforms proportionally to the absorbed power. Deformation occurs due to the difference in thermal coefficients of Al and SU-8. A quantum cascade laser (QLC) emitting THz radiation is to be used as the illuminating source in the imaging system. Indicative of its flexible design and high sensitivity, further tuning can be achieved by modifying the dimensions of the patterned squares to match the absorption frequency to the illumination source for real-time THz imaging applications for military and medical purposes. We compare the outcome of etching versus the lift-off process for patterning the upper layer of metamaterial, which was implemented previously in search of metamaterial microfabrication optimization.





–  –  –

With recent advancements in biomaterial science, designing and optimizing naturally derived delivery vehicles for therapeutic agents hold great potential in treatment of a wide range of diseases. A major stepping stone to the success of this research is finding a way to mitigate the foreign body response to the material used. It has been shown that biomaterials like poly-L-lysine have the potential to induce a foreign body response, resulting in fibrotic capsules that eventually lead to necrosis of the encapsulated therapeutic agent. One application of particular interest is the artificial pancreas for type I diabetes treatment in which insulin-producing cells are encapsulated in a polymer. Fibrotic tissue formation is thought to be one of the factors in the failure of this device. It is hypothesized that functionalized polymers will have an inhibiting effect on cell migration and contractile scarring, potentially limiting fibrosis. For this work, 5 ml Petri dishes were coated with either alginate or poly-L-arginine which had been functionalized with one of an array of monomers. These Petri dishes were then seeded with 15,000 NIH 3T3 cells.

Cell migration was investigated using time-lapse video microscopy to track cell motion. Experimental results will be reported at the end of the project. Vascular endothelial growth factor will also be measured as it holds the potential to create new blood vessels, supplying the encapsulated cells with nutrients.

SAT-288

RESPONSIVE ENERGETIC SOL-GEL-POLYMER NANOCOMPOSITES FOR ARTIFICIAL PHOTOSYNTHESIS

Anthony Magdalena1, Gabriel Montano2.

University of New Mexico-Los Alamos, Los Alamos, NM, 2Center for Integrated Nanotechnologies, Los Alamos 1 National Laboratory, Los Alamos, NM.

A variety of photosynthetic organizations can be found in nature. In a majority of such complexes, membraneembedded proteins serve as scaffolds for pigments generating energetically, spatially ordered assemblies resulting in efficient light-harvesting, energy transfer, and charge separation. The ability to mimic the efficiency of natural photosynthetic systems has been a goal in biomaterials design for decades. Mesostructured and mesoporous silica made using sol-gel processing are promising host templates for encapsulation of biomolecules and creating bioinspired assemblies. The sol-gel process involves the transition of a solution system from a liquid “sol” (colloidal) into a solid “gel.” Surfactants are commonly used as templates in creating mesostructured or mesoporous silica during the sol-gel process resulting in ordered arrays. In this study, amphiphilic diblock copolymers that form micelles are being investigated as templates for forming mesostructured silica and as composite materials for creating bioinspired artificial photosynthetic assemblies. We have designed nanocomposites that incorporate porphyrin-based chromophores and carbon-based nanomaterials in varying compositions into responsive block-copolymer micelle assemblies encapsulated in sol-gel in order to generate photo-responsive bio-inspired materials. The designed nanocomposites investigated are an initial attempt to generate responsive, ordered arrays capable of performing artificial photosynthetic processes such as light-harvesting, energy transfer, and charge-separation.

197 UNDERGRADUATE POSTER ABSTRACTS

SAT-289

EXPERIMENTAL AND FINITE ELEMENT METHOD ANALYSIS OF THE MECHANICAL BEHAVIOR OF

SANDWICH STRUCTURES

Sandra Diaz, Lilian Davila.

University of California, Merced, Merced, CA.

The goal of this study is to evaluate and predict the mechanical properties of sandwich structures consisting of two 6061 Al sheets and a polyurethane foam core as a function of three different foam densities (96.1 kg/m3, 160 kg/ m3, and 320 kg/m3). Computer simulations and experiments are being carried out in this project in order to create an efficient procedure for future design considerations. A finite element method (FEM) program, COMSOL Multiphysics 4.3, is used to predict the critical buckling load and bending modulus of the sandwich structure when it is subjected to uniaxial compression loads and a 3-point bending test. The results are compared with previous independent experimental findings. From the FEM simulations, other mechanical properties are analyzed including the maximum von Mises stress, displacement, and volumetric strain among others. An experimental 3-point bending test is also conducted using an Instron universal testing machine to measure the mechanical properties of the sandwich structure. Predicted results show that the critical buckling load (and bending modulus) increases as foam density increases, implying that the density and strength of the foam in the sandwich structure have a direct relationship and affect the overall properties of the combined foam-sheet system. In brief, simulations and experimentation combined can be a powerful tool for the study, prediction, and design of new or advanced materials. Future work will involve assessment of the feasibility of these sandwich structures as vehicle impact absorbers, allowing future automobiles to be lighter and safer, which in return would increase fuel efficiency.

FRI-290

INDUCED NEGATIVE VISCOSITY AS A DEGREE OF FREEDOM IN THE ELECTROSPINNING OF POLYMERIC

SOLUTIONS Lina Sanchez-Botero, Alejandro Garcia, Juan Hinestroza.

Cornell University, Ithaca, NY.

This paper seeks to provide evidence for the negative viscosity effect in non-Newtonian ferrofluids and provide an avenue to investigate the new parameter of non-Newtonian behavior that is affected by both the magnetic field and shear stresses. Previous models developed by Shliomis, Felderhof, Weng, and Chen have described the phenomenon of magnetoviscosity for Newtonian (ferro) fluids from irreversible thermodynamics but, until now, there has been no work done purely on non-Newtonian ferrofluids. The induced negative viscosity effect in a polymer solution with magnetic nanoparticles is presented both from an experimental and theoretical view. As part of a new design, a linear solenoid was coiled around a ferrite hollow bar to produce higher magnetic fields. Results using a capillary rheometer indicated that the magnetic nanoparticle colloidal fluid under an AC-generated magnetic field displayed an overall reduction of viscosity under certain shear rates. Additionally, measurements demonstrate a significant reduction in viscosity of the liquid with the AC-generated field versus no field. For a Hagen-Poiseuille flow, additional measurements implementing shear also demonstrate a combination of magnetic and non-Newtonian properties. A model considering both the magnetic and non-Newtonian properties is developed, taking from the earlier models. The models of Weng and Chen, and one model of Shliomis, explore non-Newtonian behavior in Newtonian ferrofluids under a combination of magnetic fields and shear stresses, but an actual non-Newtonian fluid is not employed.

MECHANICAL ENGINEERING

FRI-293

LAYOUT DESIGN FOR HYBRID ELECTRIC VEHICLE TEST PLATFORM

Xavier Castaneda1, Changjian Hu2, Ewan Pritchard2.

College of the Sequoias, Visalia, CA, 2North Carolina State University, Raleigh, NC.

1 Electric vehicles (EVs) and hybrid electric vehicles (HEVs) have the potential to provide efficiency benefits over vehicles with combustion engines. Current vehicle test beds available are not suitable for HEV testing purposes. An HEV test platform can provide automobile manufacturers with accessible performance tests and can also be a helpful tool for researchers to develop automobile software, components, and control strategies. The HEV test platform

198 UNDERGRADUATE POSTER ABSTRACTS

consists of a chassis with hybrid drive train, a data acquisition system, a chassis dynamometer, and a MotoHawk micro controller. In this research, we mainly focus on the layout design of the hybrid drive train converted from a pure electric drive which comes from a Department of Energy project. The conversion research begins with the 3D modeling of the existing chassis components in SolidWorks. Components were first measured, sketched, and then modeled to appropriate or representative dimensions. With all parts modeled, different layouts for the chassis can be virtually assembled for further analysis. Four different designs are proposed whose benefits and difficulties are analyzed respectively. The most appropriate design was chosen after analyzing the tradeoffs of all designs. This design research provides an optimal layout of the chassis with the hybrid drive train which will benefit the future development of the HEV test platform.

SAT-295

MASS AND ENERGY BALANCE QUANTIFICATION OF BIOMASS IN A PLASMA GASIFICIATION SYSTEM

Engineering Alexandro Perez-Tovar, Gerardo Diaz.

University of California, Merced, Merced, CA.



Pages:     | 1 |   ...   | 59 | 60 || 62 | 63 |   ...   | 112 |


Similar works:

«Language endangerment in Amazonia: the role of missionaries PATIENCE L. EPPS University of Virginia Viele Sprachen Amazoniens, wie auch anderswo in der Welt, sind heute ernsthaft bedroht. Zu einem großen Teil resultiert dies aus dem Druck, den der Kontakt zwischen den eingeborenen Sprechern dieser Sprachen und den nicht-indigenen (hauptsächlich europäischen) Neuankömmlingen hervorgerufen hat. Dabei hat der von Missionaren ausgeübte Druck bei der Entwicklung der Bedrohung eine Hauptrolle...»

«ADNAN KASMAN ÖZGEÇMİŞ (Dokuz Eylül Üniversitesi 2016-2020 Dönemi Rektör Adayı) Adres Dokuz Eylül Üniversitesi, İşletme Fakültesi, İktisat Bölümü, Kaynaklar Yerleşkesi Tinaztepe 35160 Buca-Izmir Phone : (232) 412 8209 Fax : (232) 453 5062 E-mail: adnan.kasman@deu.edu.tr Web : www.adnankasman.com EĞİTİM 1994-1999 Vanderbilt Üniversitesi, Nashville, Tennessee – ABD Doktora – Ekonomi 1994-1997 Vanderbilt Üniversitesi, Nashville, Tennessee – ABD Yüksek LisansEkonomi...»

«A Case for Volunteer Management in Early Childhood Development: Community Engagement as a Cornerstone to Family Building Blocks’ Success by Maren Symonds, Encore Fellow, Boomers and Babies, The Oregon Community Foundation Early childhood education advocates are keenly aware of three things. FIRST: The years between 0 and 5 are crucial for nurturing the cognitive, emotional, and social skills that lay the foundation for success in school and in life. SECOND: Forty percent of children born in...»

«Administração do Porto de Maceió APMC Plano de Desenvolvimento e Zoneamento do Por to de Maceió Cadastro, Acessos e Condições Climáticas e de Segurança à Navegação do Por to de Maceió Março/2011 RELATÓRIO DE CADASTRO, ACESSOS E CONDIÇÕES CLIMÁTICAS E DE SEGURANÇA À NAVEGAÇÃO DO PORTO DE MACEIÓ PDZ do Porto de Maceió PETCON – PLANEJAMENTO EM TRANSPORTE E CONSULTORIA LTDA. SBS Qd. 02, Ed. Empire Center, Sala 1303 (Cobertura) • 70.070-904 • Brasília DF (61) 3212...»

«Financial Markets, Banks’ Cost of Funding, and Firms’ Decisions: Lessons from Two Crises PIERLUIGI BALDUZZI1, EMANUELE BRANCATI2, and FABIO SCHIANTARELLI3 This draft: August 9, 2016 ABSTRACT We test whether adverse changes to banks’ market valuations during the financial and sovereign debt crises affected firms’ real decisions. Using new data linking over 5,000 non-financial Italian firms to their bank(s), we find that increases in banks’ CDS spreads, and decreases in their...»

«Mustard Seed Children’s Summary for 28 September 2008 Released on Wednesday, September 24, 2008 “Serving Others” BACKGROUND SCRIPTURE: Matthew 20:1-28; Mark 10:32-45 MEMORY VERSE: “The Son of man came not to be ministered unto, but to minister, and to give his life a ransom for many” (Matthew 20:28) LESSON TEXT: Matthew 20:17-28 17 And Jesus going up to Jerusalem took the twelve disciples apart in the way, and said unto them, 18 Behold, we go up to Jerusalem; and the Son of man shall...»

«RAIN FALL a thriller by Barry Eisler In the changing of the times, they were like autumn lightning, a thing out of season, an empty promise of rain that would fall unheeded on fields already bare. – Shosaburo Abe, master swordsman, on the Meiji era samurai PART I Who is the third who walks always beside you? When I count, there are only you and I together But when I look ahead up the white road There is always another one walking beside you Gliding wrapt in a brown mantle, hooded I do not...»

«OCTOBER 2014 MINISTERIAL FORUM ON ALCOHOL ADVERTISING & SPONSORSHIP As a Forum we believe protecting the young from alcohol-related harm is paramount RECOMMENDATIONS ON ALCOHOL ADVERTISING & SPONSORSHIP Page ii FOREWORD The members of the Ministerial Forum on Alcohol Advertising and Sponsorship (the Forum) came to this process with diverse backgrounds and experience. Our capacity to present a range of perspectives and understand and represent the interests of the community and other...»

«with valuable cooperation ofoperation of Université de Bourgogne, Dijon France Centre National de la Recherche Scientifique, France Association de Promotion de la Recherche scientifique en système d’Information Multimédia en Emergence, Dijon France Università di Milan Italy Laboratoire LE2I UMR CNRS 5158, Dijon France Tokyo Denki University, Tokyo Japan SIGSMM (Special Interest Group on Semantic Multimedia Management) French Chapter of the Special Interest Group on Applied Computing...»

«OCTOBER TERM, 2010 1 (Slip Opinion) Syllabus NOTE: Where it is feasible, a syllabus (headnote) will be released, as is being done in connection with this case, at the time the opinion is issued. The syllabus constitutes no part of the opinion of the Court but has been prepared by the Reporter of Decisions for the convenience of the reader. See United States v. Detroit Timber & Lumber Co., 200 U. S. 321, 337.SUPREME COURT OF THE UNITED STATES Syllabus ARIZONA FREE ENTERPRISE CLUB’S FREEDOM...»

«AGTA Announces 2016 Summer AGTA Spectrum Awards™ Winners Dallas, Texas, July 25, 2016 The American Gem Trade Association is delighted to announce the winners of the prestigious AGTA Spectrum AwardsTM. The competition was held in New York on July 23rd and 24th and is regarded as the world's preeminent colored gemstone and cultured pearl design competition. The prestigious judges for the competition this year were the following: Gail Brett-Levine of National Association of Jewelry Appraisers;...»

«Pioneer Homes Toxic Plant List Many very common indoor and outdoor ornamental plants are considered to be toxic if ingested. The amount of poison in a plant tends to vary with location, age of plant, season and climate. In some the toxin is confined only to certain parts in others any part of the plant my cause symptoms. The following plants may cause moderate to very severe toxic symptoms when ingested or dermatitis when handled and may be found indoors or outdoors at the home. Live plants are...»





 
<<  HOME   |    CONTACTS
2016 www.dissertation.xlibx.info - Dissertations, online materials

Materials of this site are available for review, all rights belong to their respective owners.
If you do not agree with the fact that your material is placed on this site, please, email us, we will within 1-2 business days delete him.