Engineering Commons^™

Biogenic Synthesis And Antibacterial Activity Of Silver Nanoparticles (Agnps) Produced By Phomopsis Sp. Strain Gfpa2, T Sutjaritvorakul, S Chutipaijit

Journal of Metals, Materials and Minerals

Silver nanoparticles (AgNPs) have many applications in different fields such as electronic industries, chemical industries, medical diagnostics and detergent products. In this research AgNPs were produced by Phomopsis sp. GFPA2 isolated from zinc mineral rocks, and were successfully synthesized by using fungal culture broth. The biogenic crystals were investigated and identified by field emission scanning electron microscopy (FE-SEM) equipped with energy dispersive X-ray spectroscopy (EDS) and X-ray powder diffraction (XRD). The spectra confirmed that the biogenic crystals were AgNPs, and they are mostly spherical in shape. The crystals were also tested for their antibacterial activity against human pathogenic bacteria such …

Properties Of Uv-Curable Screen Printing Inks Containing Oligolactide Acrylates, S Kulsiriswad, O Saravari, K Srikulkit

Journal of Metals, Materials and Minerals

This study was aimed at investigating the properties of UV-curable screen printing inks prepared from oligolactide acrylates. Those resultant inks were applied on substrates and cured by UV radiation. Then, properties of the cured ink films were evaluated and compared with a commercial acrylate ink. The degradation temperature of ink film was found at around 436°C. In addition, thus obtained films were glossy and transparent without yellowness. The weathering resistance of ink films tested by a Xenon test chamber for 500 h showed that ink films exhibited acceptable outdoor durability. Discoloration due to the degradation of lactide chain was observed, …

Study On Structure And Luminescence Properties Of Labmoo6:Dy3+ Phosphor For Photonic Material Applications, E Kaewnuam, N Wantana, H J. Kim, J Kaewkhao

Journal of Metals, Materials and Minerals

Phosphor powder of LaBMoO6:Dy3+ were prepared to investigate the structure, absorption and luminescence properties. The influence of Dy2O3 concentration on these properties were also studied. XRD characterization represents the main structure of phosphor as monoclinic from LaBMoO6 host matrix. From the reflection spectra, Dy3+ in phosphor can absorb more amount of visible light and near infrared radiation with increasing of Dy2O3 concentration. The energy band gap of LaBMoO6 compound was expanded after doping with Dy2O3 which results to the blue shift of absorption edge. The emission spectra perform the strong yellow and blue light emitting under Dy3+ electric dipole (4F9/2 …

Shape-Controlled Synthesis Of Tungsten Oxide Nanostructures And Characterization, K Petsom, A Kopwitthaya, M Horphathum, Y Ruangtaweep, N Sangwaranatee, J Kaewkhao

Journal of Metals, Materials and Minerals

Synthesis of tungsten oxide nanorods and nanodisks were reported here using hydrothermal method. Our study is focusing on the role of hexadecyltrimethyl-ammonium bromide (CTAB) and silver ions in tungsten oxide nanostructure formation comparing with typical methods. The sodium tungstate dehydrate was used as a precursor. We found that optimum concentration of CTAB and silver ions can provide a rod-like structure. Meanwhile, nanodisks were observed at the absence of silver ion. In addition, concentration of silver ions introduced to growth solution plays an important role in obtained nanostructure dimension. All prepared nanostructures were characterized by X-Ray diffraction (XRD) for crystalline structures …

Characterization And Photocatalytic Activity Of Titanium Dioxide Deposited On Stainless Steel By Pulsed-Pressure Mocvd, K Wirandorn, N Panyayao, V Siriwongrungson

Journal of Metals, Materials and Minerals

Titanium dioxide (TiO2) was deposited on stainless steel 304 by pulsed-pressure metalorganic chemical vapor deposition (PP-MOCVD). Titanium tetraisopropoxide (TTIP) in toluene at the concentration of 0.5 mol% was used as the precursor. The deposition was conducted at the base pressure of 300 Pa and deposition temperatures were varied between 350°C and 400°C. At these deposition temperatures, anatase phase is expected for further photocatalysis study. The deposited TiO2 thin films at the thickness of hundreds nanometers were analyzed using field emission scanning electron microscopy (FESEM) for surface morphology. X-ray diffraction (XRD) was applied for phase analysis. The contact angle was measured …

Temperature Dependence Of Dielectric Properties For Bfo-Bto-Bzt Ceramics, S Unruan, M Unruan, R Yimnirun

Journal of Metals, Materials and Minerals

In this work, bismuth ferrite-barium titanate-barium zirconate titanate (BFO-BTO-BZT) ceramics were prepared using conventional solid state reaction method. The (1-x)BiFeO3-xBaTiO3 at x = 0.24-0.30 and Ba(Zr,Ti)O3 (Zr = 0.5) systems were separately prepared and calcined at 800 and 1250oC, respectively. All pallets were sintered at temperature of 1100oC. After that, the relationship between phase formation, dielectric and magnetic properties were examined. The XRD patterns revealed that more structural symmetry could be observed in all single-phase perovskite ceramics when more BTO concentration was added. The 0.75(0.70BFO-0.30BTO)-0.25BZT ceramic showed highest dielectric constant with high loss measured at low frequency observed, possibly due …

The Effects Of Concentrations Of Zno Nanoparticles On Dewetting Suppression Of Ps Thin Films, J Thapoung, K Tasurin, N Traiphol, N Pangpaiboon

Journal of Metals, Materials and Minerals

Thin polymer films are widely used in industry, such as protective coating, lubricant and electrical insulator, because of their specific properties. However, thin film in nanoscale tends to separate from substrate; this phenomenon is called Dewetting. In this research, a solution of polystyrenes with a concentration of 0.3 wt% in toluene, providing ~ 21 nm polymeric film, was prepared. Zinc-oxide nanoparticles were added in a polystyrene solution as a Dewetting inhibitor. The concentrations of zinc-oxide were varied from 0 - 1.0 wt%. Thin films were cast by a spin casting machine. After annealing at 90˚C in a vacuum oven for …

Effect Of Chromium Content On The Three-Body-Type Abrasive Wear Behavior Of Multi-Alloyed White Cast Iron, J Opapaiboon, M Supradist Na Ayudhaya, P Sricharoenchai, S Inthidech, Y Matsubara

Journal of Metals, Materials and Minerals

The effect of Cr content on three-body-type abrasive wear behavior of multi-alloyed white cast iron was investigated. Multi-alloyed white cast irons were prepared with varying Cr content from 3-9 mass% under basic alloy composition. Annealed specimens were hardened from 1323 and 1373K austenitizing and tempered at three levels of temperatures which were at maximum hardness (HTmax), lower and higher than that at HTmax (L-HTmax and H-HTmax). A rubber wheel wear tester was used to evaluate the abrasive wear resistance. The hardness and volume fraction of the retained austenite (Vγ) varied depending on Cr content and heat treatment condition. The linear …

Recycled Poly(Ethylene Terephthalate)/Polypropylene/Wollastonite Composites Using Pp-G-Ma As Compatibilizer: Mechanical, Thermal And Morphological Properties, P Chaiwutthinan, S Suwannachot, A Larpkasemsuk

Journal of Metals, Materials and Minerals

Polymers investigated in this study were recycled poly(ethylene terephthalate) (rPET) as a major phase (matrix) and virgin polypropylene (PP) as a minor phase (dispersed phase). Initially, rPET was melt mixed with four different PP contents (10 - 40 wt%) on a co-rotating twin screw extruder and then injection molded. The blend at 30 wt% PP exhibited the highest impact strength and elongation at break and an acceptable tensile strength and Young's modulus. The 70/30 (w/w) rPET/PP blend was then upgraded its compatibility using 1 - 7 parts by weight per hundred of blend resin (phr) of maleic anhydride grafted PP …

Comparative Analysis Of Electrodynamic Toroidal Radiation Shielding Configurations, Max Rosenberg

Master's Theses

Beyond the protective confines of Earth's atmosphere and magnetosphere, spacecraft are subject to constant bombardment by high-energy charged particles originating from our Sun in the form of Solar Particle Events (SPEs), and from outside the solar system in the form of Galactic Cosmic Rays (GCRs). The harm these particles do can be reduced or mitigated outright through radiation shielding. Because protons and other charged particles comprise most of these radiation particles, strong magnetic fields could be generated around spacecraft to deflect incoming charged radiation particles. This thesis investigates the performance of specific configurations of toroidal superconducting solenoids to generate magnetic …

Fluid Agitation Studies For Drug Product Containers Using Computational Fluid Dynamics, Matthew Hiroki Ichinose

Master's Theses

At Amgen, the Automated Vision Inspection (AVI) systems capture the movement of unwanted particles in Amgen's drug product containers. For quality inspection, the AVI system must detect these undesired particles using a high speed spin-stop agitation process. To better understand the fluid movements to swirl the particles away from the walls, Computational Fluid Dynamics (CFD) is used to analyze the nature of the two phase flow of air and a liquid solution.

Several 2-D and 3-D models were developed using Fluent to create simulations of Amgen's drug product containers for a 1 mL syringe, 2.25 mL syringe, and a 5 …

Logging, Visualization, And Analysis Of Network And Power Data Of Iot Devices, Neal Huynh Nguyen

Master's Theses

There are approximately 23.14 billion IoT(Internet of Things) devices currently in use worldwide. This number is projected to grow to over 75 billion by 2025. Despite their ubiquity little is known about the security and privacy implications of IoT devices. Several large-scale attacks against IoT devices have already been recorded.

To help address this knowledge gap, we have collected a year’s worth of network traffic and power data from 16 common IoT devices. From this data, we show that we can identify different smart speakers, like the Echo Dot, from analyzing one minute of power data on a shared power …

A Computational Fluid Dynamics (Cfd) Analysis Of The Aerodynamic Effects Of The Seams On A Two-Dimensional Representation Of A Soccer Ball, Allen R. Rohr

Master's Theses

Most major sports today use a dedicated ball or projectile with specific shape, size, and surface geometry, except for soccer. Over the history of the sport, the surface geometry and design stayed relatively unchanged, sewn together using 32 pentagonal and hexagonal panels. However, recent innovations in panel designs differ substantially from the traditional 32 panel ball. The effects these new designs have on the aerodynamic characteristics of the ball have remained largely unknown, even with the influx of experimental research completed in the past decade. Experimental studies have been broad in scope, analyzing an entire ball in wind tunnels or …

Hip And Knee Biomechanics For Transtibial Amputees In Gait, Cycling, And Elliptical Training, Greg Orekhov

Master's Theses

Transtibial amputees are at increased risk of contralateral hip and knee joint osteoarthritis, likely due to abnormal biomechanics. Biomechanical challenges exist for transtibial amputees in gait and cycling; particularly, asymmetry in ground/pedal reaction forces and joint kinetics is well documented and state-of-the-art passive and powered prostheses do not fully restore natural biomechanics. Elliptical training has not been studied as a potential exercise for rehabilitation, nor have any studies been published that compare joint kinematics and kinetics and ground/pedal reaction forces for the same group of transtibial amputees in gait, cycling, and elliptical training. The hypothesis was that hip and knee …

Population Curation In Swarms: Predicting Top Performers, Ryan W. Heller

Master's Theses

In recent years, new Artificial Intelligence technologies have mimicked examples of collective intelligence occurring in the natural world including flocks of birds, schools of fish, and swarms of bees. One company in particular, Unanimous AI, built a platform (UNU Swarm) that enables a group of humans to make decisions as a single mind by forming a real-time closed-loop feedback system for individuals. This platform has proven the ability to amplify the predictive ability of groups of humans in realms including sports, medicine, politics, finance, and entertainment. Previous research has demonstrated it is possible to further enhance knowledge accumulation within a …

Ridership Ramp-Up For Fixed-Guideway Transit Projects: An Evaluation Of Initial Ridership Variation, Jill Elizabeth Shinn

Master's Theses

Performance-based planning and programming has increased in popularity for transit project funding in recent years. This methodology focuses on quantitative performance measures to inform decision making. For transit projects, projections or observed ridership is the most commonly used performance measure to evaluate project benefits. Conventional wisdom within the transit industry suggests that measuring the performance of a transit project immediately after project opening may not capture all the project’s benefits, since it takes time for a project to realize its short-term ridership potential, a process commonly referred to as ridership ramp-up. While this idea is both intuitive and appealing, especially …

Increasing Algal Productivity And Treatment Potential In Raceways Fed Clarified Municipal Wastewater, Christopher D. Pittner

Master's Theses

Two sets of triplicate pilot algal raceway ponds (1000-L, 0.30-m deep, paddle wheel mixed) were operated for 14 months at a California wastewater treatment plant to treat wastewater and generate algal-bacterial biomass as biofuel feedstock. Two experiments were run to determine the effect on biomass productivity of (1) hydraulic residence time (HRT: 2, 3, 4, or 4.5 days) and (2) feeding schedule (18 small pulses during 8 AM-4 PM [diurnal] versus 20 large pulses during 4 AM-12 AM [diel]). The target productivity was at least 20 g volatile suspended solids per m2 of pond per day. Additional output variables were …

A Novel All Wheel Drive Torque Vectoring Control System Applied To Four Wheel Independent Drive Electric Motor Vehicles Utilizing Super Twisting And Linear Quadratic Regulator Methods, Kenneth Daniel Schmutz

Master's Theses

This thesis contains the design and simulation test results for the implementation of a new all-wheel drive (AWD) torque vectoring (TV) control system. A separate algorithm using standard control methods is included in this study for a comparison. The proposed controller was designed to be applied to an AWD independent drive electric vehicle, however the main concepts can be re-purposed for other vehicle drive train configurations. The purpose of the control system is to assist the driver in achieving a desired vehicle trajectory whilst also maintaining stability and control of the vehicle. This is accomplished by measuring various real time …

Bi-Stability In The Wakes Of Platooning Ahmed Bodies, Daniel M. Stalters

Master's Theses

Autonomous heavy vehicles will enable the promise of decreased energy consumption through the ability to platoon in closer formation than is currently safe or legal. It is therefore increasingly important to understand the complex and dynamic wake interactions between vehicles operating in close proximity for aerodynamic gains. In recent years, a growing body of research has documented a bi-stable, shifting wake generated behind the Ahmed reference bluff body. At the same time, studies of platooning Ahmed bodies have focused on changes to the body forces and moments at different following distances or lateral offsets, typically based around time-averaged measurements or …

Organize Events Mobile Application, Thakshak Mani Chandra Reddy Gudimetla

Electronic Theses, Projects, and Dissertations

In a big organization there are many events organized every day. To know about the events, we typically need to check an events page, rely on flyers or on distributed pamphlets or through word of mouth. To register for an event a user now a days typically does this online which involves inputting user details. At the event, the user either signs a sheet of paper or enters credentials in a web page loaded on a tablet or other electronic device. Typically, this is a time-consuming process with many redundancies like entering user details every time the user wants to …

California State University, San Bernardino Chatbot, Krutarth Desai

Electronic Theses, Projects, and Dissertations

Now-a-days the chatbot development has been moving from the field of Artificial-Intelligence labs to the desktops and mobile domain experts. In the fastest growing technology world, most smartphone users spend major time in the messaging apps such as Facebook messenger. A chatbot is a computer program that uses messaging channels to interact with users using natural Languages. Chatbot uses appropriate mapping techniques to transform user inputs into a relational database and fetch the data by calling an existing API and then sends an appropriate response to the user to drive its chats. Drawbacks include the need to learn and use …

Study On The Pattern Recognition Enhancement For Matrix Factorizations With Automatic Relevance Determination, Hau Tao

Electronic Theses, Projects, and Dissertations

Learning the parts of objects have drawn more attentions in computer science recently, and they have been playing the important role in computer applications such as object recognition, self-driving cars, and image processing, etc… However, the existing research such as traditional non-negative matrix factorization (NMF), principal component analysis (PCA), and vector quantitation (VQ) has not been discovering the ground-truth bases which are basic components representing objects. On this thesis, I am proposed to study on pattern recognition enhancement combined non-negative matrix factorization (NMF) with automatic relevance determination (ARD). The main point of this research is to propose a new technique …

Automated Quantification And Evaluation Of Motion Artifact On Coronary Ct Angiography Images, Hongfeng Ma, Eric Gros, Scott G. Baginski, Zachary R. Laste, Naveen M. Kulkarni, Darin Okerlund, Taly Gilat Schmidt

Biomedical Engineering Faculty Research and Publications

Abstract

Purpose

This study developed and validated a Motion Artifact Quantification algorithm to automatically quantify the severity of motion artifacts on coronary computed tomography angiography (CCTA) images. The algorithm was then used to develop a Motion IQ Decision method to automatically identify whether a CCTA dataset is of sufficient diagnostic image quality or requires further correction.

Method

The developed Motion Artifact Quantification algorithm includes steps to identify the right coronary artery (RCA) regions of interest (ROIs), segment vessel and shading artifacts, and to calculate the motion artifact score (MAS) metric. The segmentation algorithms were verified against ground‐truth manual segmentations. The …

Environmental Fate And Microbial Effects Of Monensin, Lincomycin, And Sulfamethazine Residues In Soil, Matteo D'Alessio, Lisa M. Durso, Daniel N. Miller, Brian Woodbury, Chittaranjan Ray, Daniel D. Snow

Nebraska Water Center: Faculty Publications

The impact of commonly-used livestock antibiotics on soil nitrogen transformations under varying redox conditions is largely unknown. Soil column incubations were conducted using three livestock antibiotics (monensin, lincomycin and sulfamethazine) to better understand the fate of the antibiotics, their effect on nitrogen transformation, and their impact on soil microbial communities under aerobic, anoxic, and denitrifying conditions. While monensin was not recovered in the effluent, lincomycin and sulfamethazine concentrations decreased slightly during transport through the columns. Sorption, and to a limited extent degradation, are likely to be the primary processes leading to antibiotic attenuation during leaching. Antibiotics also affected microbial respiration …

The Influence Of Shared Mobility And Transportation Policies On Vehicle Ownership, Edgar Bertini Ruas

PSU Transportation Seminars

With the emergence of several new providers of shared mobility services, such as Uber, Biketown and Car2go, there has been the promise of changes to the traditional way of owning and using a vehicle. One potential consequence of the new mobility services is the reduction in vehicle ownership. At the same time, cities are trying to anticipate these changes by reducing the amount of space dedicated to parking. This thesis aims to asses the extent to which new shared mobility and transportation policy strategies (especially parking requirements and transit pass availability) relate to vehicle ownership among residents of multifamily dwellings. …

Deploying, Improving And Evaluating Edge Bundling Methods For Visualizing Large Graphs, Jieting Wu

School of Computing: Dissertations, Theses, and Student Research

A tremendous increase in the scale of graphs has been witnessed in a wide range of fields, which demands efficient and effective visualization techniques to assist users in better understandings of large graphs. Conventional node-link diagrams are often used to visualize graphs, whereas excessive edge crossings can easily incur severe visual clutter in the node-link diagram of a large graph. Edge bundling can effectively remedy visual clutter and reveal high-level graph structures. Although significant efforts have been devoted to developing edge bundling, three challenging problems remain. First, edge bundling techniques are often computationally expensive and are not easy to deploy …

Mechanical Engineering News, Georgia Southern University

Mechanical Engineering: News & Publications (2013-2023)

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Unsteady Modeling On Fly Ash Deposition In Full-Scale Gas-To-Gas Heaters For Ultrasupercritical Pulverized Coal-Fired Power Plant Applications, Sandeep Aryal

Student Theses and Dissertations

Ash deposition is a real concern in the pulverized coal-fired power plants because it inhibits heat transfer in heat exchangers which ultimately reduces the power plant efficiency and causes material damage to them by corrosion or erosion. The objective of this study is to investigate the impact of fuel quality on ash deposition by combined effect of inertial impaction and thermophoresis, assimilating shedding factor for transient modeling in the low-temperature heat exchangers (Gas-to-Gas Heaters). Single tube method with finite cell division approach is implemented in MATLAB 2017a to solve the governing equations for predicting ash deposition rates. The Stokes based …

Analytical Modeling On Multiphase Heat And Mass Transfer In Full-Scale Gas-To-Gas Heaters For Ultrasupercritical Pulverized Coal-Fired Power Plant Applications, Santosh Tamang

Student Theses and Dissertations

Analytical modeling on multiphase heat and mass transfer in full-scale heat exchangers were developed for pulverized coal-fired power plant applications. A computer code was developed using MATLAB (R2017a) software to predict the temperature profiles of flue gas and water, heat transfer rate, condensation rate of water vapor and Sulfuric acid vapor, and effectiveness of heat exchanger. Numerical simulations based on an analytical model of heat and mass transfer was conducted and compared with the measured data from the coal power plant. The predicted temperature of flue gas and water, heat transfer rate, and effectiveness agreed well with the measured data. …

“How Is My Child’S Asthma?” Digital Phenotype And Actionable Insights For Pediatric Asthma, Utkarshani Jaimini, Krishnaprasad Thirunarayan, Maninder Kalra, Revathy Venkataramanan, Dipesh Kadariya, Amit Sheth

Publications

Background: In the traditional asthma management protocol, a child meets with a clinician infrequently, once in 3 to 6 months, and is assessed using the Asthma Control Test questionnaire. This information is inadequate for timely determination of asthma control, compliance, precise diagnosis of the cause, and assessing the effectiveness of the treatment plan. The continuous monitoring and improved tracking of the child’s symptoms, activities, sleep, and treatment adherence can allow precise determination of asthma triggers and a reliable assessment of medication compliance and effectiveness. Digital phenotyping refers to moment-by-moment quantification of the individual-level human phenotype in situ using data from …