Digital Commons Network^™

Post Deposition Annealing Effect On Properties Of Y 2 O 3 /Al 2 O 3 Stacking Gate Dielectric On 4h-Sic, Feng Zhao, Oliver Amnuayphol, Kuan Yew Cheong, Yew Hoong Wong, Jheng Yi Jiang, Chih Fang Huang

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, the effect of post deposition annealing (PDA) on the chemical, structural, and electrical properties of the high-kY₂O₃ /Al₂O₃ stacking dielectric on p-type 4H-SiC were studied. High-k dielectric provides a physically thicker film with equivalent capacitance, therefore better exploits the high breakdown strength of 4H-SiC in its MOSFET devices. The Y₂O₃ /Al₂O₃ stacking films were deposited using RF magnetron sputtering, with PDA in Ar ambient at 400 °C, 600 °C, 800 °C and 1000 °C. X-ray diffraction (XRD) and angle resolved X-ray photoelectron spectroscopy (XPS) results …

Faculty Senate Meeting Agenda June 13, 2019, Missouri University Of Science And Technology Faculty Senate

Minutes & Agendas

No abstract provided.

Faculty Senate Minutes June 13, 2019, Missouri University Of Science And Technology Faculty Senate

Minutes & Agendas

No abstract provided.

Achieving High-Power Configuration In Missouri S&T Reactor (Mstr) For Potential Uprate, Thaqal Alhuzaymi, Ayodeji Babatunde Alajo

Nuclear Engineering and Radiation Science Faculty Research & Creative Works

Research reactor is a powerful tool because of its wide contribution, almost to each field of science. It’s considered to be an essential element for advancing research, development and improvement in nuclear industry. The main goal of research reactor is to produce neutrons which are beneficially used for a wide range of applications such as industrial, agricultural, medical, etc. Neutron spectrum impact it uses. Commonly, neutrons with low energy level, up to 0.5 eV, called thermal neutrons where neutrons with intermediate energy level, ranging from 0.5 eV to 0.10 MeV, called epithermal "resonance" neutrons and neutron with high energy level, …

Low-Power Core Reconfiguration For Missouri S&T Reactor (Mstr), Thaqal Alhuzaymi, Ayodeji Babatunde Alajo

Nuclear Engineering and Radiation Science Faculty Research & Creative Works

The Missouri University of Sciences and Technology Reactor (MSTR) is pool-type research reactor which operates up to 200 kilowatt (kW). MSTR used for training and educating nuclear engineering students at Missouri S&T. A several of nuclear researches and irradiation experiments have been conducted in MSTR for example, neutron activation analysis (NAA), neutron radiography, radiolysis, image processing, etc. MSTR initial criticality took place on December 9, 1961. The first power level that MSTR operates at, was 10 kW. The power level alongside the core configuration was upgraded to the current ones, see Fig. 1. MSTR used light-water for moderation and natural …

Charge Deposition, Redistribution, And Decay Properties Of Insulating Surfaces Obtained From Guiding Of Low-Energy Ions Through Capillaries, Robert D. Dubois, K. Tokési, E. Giglio

Physics Faculty Research & Creative Works

We present a combined experimental and theoretical study of the transmission of single charged 1-keV Ar ions through a cylindrical glass capillary of macroscopic dimensions. From quantitative measurements of the incoming and transmitted ion currents, combined with a detailed analysis, the amount of beam entering the capillary was determined. This, combined with the measured transmitted currents, was used to determine the amount of charge deposited on the inner wall of the capillary which produces the guiding electric field. We show experimental results for fully, and partially, discharged conditions of the time evolution of the guided beam intensity following a wide …

Antennas And Related Methods For Realizing Endfire Radiation With Vertical Polarization, Haozhan Tian, Lijun Jiang, Tatsuo Itoh

Electrical and Computer Engineering Faculty Research & Creative Works

Apparatus and systems for antennas for end fire radiation with vertical polarization are described. In an embodiment, an antenna includes a top patch, a ground substrate defining a hole, a feeding cable disposed to mate with the hole, two coupled radiating resonant cavities having two eigen-modes, where the coupled radiating resonant cavities are configured to form a beam, and where the antenna is configured for end fire radiation with vertical polarization.

Systems And Methods For Single-Element Beam Steering Antennas, Haozhan Tian, Lijun Jiang, Tatsuo Itoh

Electrical and Computer Engineering Faculty Research & Creative Works

Systems and methods for single element beam steering antennas are provided. One embodiment includes: a first and second radiating resonant cavities, where the first and second radiating resonant cavities are coupled together; and at least one tunable component; where the first and second radiating resonant cavities, and the at least one tunable component are configured, in combination, to form a beam toward a desired direction, and where the at least one tunable component is configured to set the desired direction by an application of a bias voltage on the at least one tunable component.

Kinetic Resolution Of Cyclic Secondary Azides, Using An Enantioselective Copper-Catalyzed Azide-Alkyne Cycloaddition, Juliana R. Alexander, Amy A. Ott, En Chih Liu, Joseph J. Topczewski

Chemistry Faculty Research & Creative Works

An enantioselective copper-catalyzed azide-alkyne cycloaddition (E-CuAAC) is reported by kinetic resolution. Chiral triazoles were isolated in high yield with limiting alkyne (up to 97:3 enantiomeric ratio (er)). A range of substrates were tolerated (>30 examples), and the reaction was scaled to >1 g. The er of a triazole product could be enhanced by recrystallization and the recovered scalemic azide could be racemized and recycled. Recycling the azide allows efficient use of the undesired azide enantiomer.

Performance Based Design For Bridge Piers Impacted By Heavy Trucks, Anil K. Agrawal

INSPIRE Archived Webinars

Based on bridge failure data compiled by New York State Department of Transportation, collision, both caused by vessel and vehicles, is the second leading cause of bridge failures after hydraulic. Current AASHTO-LRFD (2012) recommends designing a bridge pier vulnerable to vehicular impacts for an equivalent static force of 600 kips (2,670 kN) applied in a horizontal plane at a distance of 5.0 feet above the ground level. This research presents a performance-based approach for designing a bridge pier subject to impacts by tractor-semi-trailer weighing up to 80,000 lb based on an extensive investigation using finite element model of a tractor-semitrailer …

Spiking Networks For Improved Cognitive Abilities Of Edge Computing Devices, Anton Akusok, Yoan Miche, Kaj Mikael Björk, Renjie Hu, Leonardo Espinosa Leal, Amaury Lendasse

Engineering Management and Systems Engineering Faculty Research & Creative Works

This Concept Paper Highlights a Recently Opened Opportunity for Large Scale Analytical Algorithms to Be Trained Directly on Edge Devices. Such Approach is a Response to the Arising Need of Processing Data Generated by Natural Person (A Human Being), Also Known as Personal Data. Spiking Neural Networks Are the Core Method Behind It: Suitable for a Low Latency Energy-Constrained Hardware, Enabling Local Training or Re-Training, While Not Taking Advantage of Scalability Available in the Cloud.

Music Appreciation: Music Of Latin America, Lorie L. Francis

AOER Course Materials

No abstract provided.

Positivity-Preserving, Energy Stable Numerical Schemes For The Cahn-Hilliard Equation With Logarithmic Potential, Wenbin Chen, Cheng Wang, Xiaoming Wang, Steven M. Wise

Mathematics and Statistics Faculty Research & Creative Works

In this paper we present and analyze finite difference numerical schemes for the Cahn-Hilliard equation with a logarithmic Flory Huggins energy potential. Both first and second order accurate temporal algorithms are considered. in the first order scheme, we treat the nonlinear logarithmic terms and the surface diffusion term implicitly and update the linear expansive term and the mobility explicitly. We provide a theoretical justification that this numerical algorithm has a unique solution, such that the positivity is always preserved for the logarithmic arguments, i.e., the phase variable is always between −1 and 1, at a point-wise level. in particular, our …

Rubberized Chip Seal Implementation In Mid-Missouri, Alireza Pourhassan, Ahmed Gheni, Mohamed Elgawady

Civil, Architectural and Environmental Engineering Technical Reports

Chip seal is one of the most common and cost-effective maintenance treatment approaches to improve the life-time of pavements. Recently, the research team developed a rubberized chip seal where natural aggregate is replaced with crumb rubber obtained from recycled tires. During this study, chip seal specimens with crumb rubber and mineral aggregate were designed and constructed according to three different common methods including McLeod, Kearby, and modified Kearby.

The macrotexture of the laboratory specimens was investigated using the sand patch and image processing methods to show how each reflects on the skid resistance. The values of the mean texture depth …

Missouri S&T Magazine Summer 2019, Missouri S&T Marketing And Communications Department, Miner Alumni Association

Missouri S&T Magazine

No abstract provided.

Whole-Genome Analysis Of Halomonas Sp. Soap Lake #7 Reveals It Possesses Putative Mrp Antiporter Operon Groups 1 And 2, Melanie R. Mormile, Tiffany Edwards, Ronald L. Frank, Zachery Geurin, Julie Haendiges, Maria Hoffmann, Jesse Miller

Biological Sciences Faculty Research & Creative Works

The genus Halomonas possesses bacteria that are halophilic or halotolerant and exhibit a wide range of pH tolerance. The genome of Halomonas sp. Soap Lake #7 was sequenced to provide a better understanding of the mechanisms for salt and pH tolerance in this genus. The bacterium's genome was found to possess two complete multiple resistance and pH antiporter systems, Group 1 and Group 2. This is the first report of both multiple resistance and pH antiporter Groups 1 and 2 in the genome of a haloalkaliphilic bacterium.

Problem-Based Learning As A Pedagogy For Individual Students -- Quantifying The Long-Term Effects Of Land Subsidence And Rising Sea Levels In Coastal Areas For Greater Student Engagement, Sanjay Tewari

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Course-based class discussions usually are limited to course syllabus and topics of lectures. If a discussion goes beyond course syllabus and the topics, usually there is a time constraint of class/lab periods, keeping educators and students from going deeper. Even without time constraints of class/lab settings, some students get engaged in the overall learning process more when they are challenged or tasked to solve a problem. This paper focuses on the pedagogical aspect of problem-based learning and its application for greater engagement of these students in quantifying the long term effects of land subsidence and rising sea levels in coastal …

Utility Of Reading Assignments In Environmental Engineering Education For Effective Learning And Greater Student Engagement In An Era Of Innovative Pedagogy And Emerging Technologies, Sanjay Tewari

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Making teaching more effective has been a never-ending pursuit since the dawn of education. Engineering education is no exception to this. There have been numerous pedagogical advances making engineering education more effective. Most engineering majors, some more than others, have dedicated laboratories for hands-on learning of specific concepts and techniques. However, a major portion of teaching still takes places in classroom settings. Educators adopt various pedagogical practices, teaching-aids, and technologies to engage students in the controlled environment of classrooms. In ideal class settings, an instructor should be able to reach out to all students regardless of their learning styles. Introductory …

Full Functionality And Recovery Assessment Framework For A Hospital Subjected To A Scenario Earthquake Event, Emad M. Hassan, Hussam Mahmoud

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Modeling the recovery process of a community's infrastructure after the occurrence of extreme events is now at the forefront of research. Estimating post-disaster recovery of either single or multiple infrastructure in a community requires proper flow and interaction of information of the physical, economic and social components of the involved sectors. Understanding this recovery process is essential, particularly for critical infrastructure, such as a hospital, which is vital for a community's well-being. In this study, the full seismic functionality and recovery process of a six-story hospital, located in Memphis, TN, is quantified and assessed using a comprehensive 3-D finite element …

An Experimental Evaluation Of The 6top Protocol For Industrial Iot Applications, Francesca Righetti, Carlo Vallati, Sajal K. Das, Giuseppe Anastasi

Computer Science Faculty Research & Creative Works

The IETF is currently defining the 6TiSCH architecture for the Industrial Internet of Things to provide reliable and timely communication. 6TiSCH includes a distributed management mode, in which network resources are computed autonomously by nodes and allocated in a cooperative way. Specifically, nodes use the 6top protocol to negotiate network resources with their neighbors. In this paper, we investigate the performance of 6top protocol through a set of experimental measurements on a testbed. We show that the time required to complete a 6top transaction in a real environment is not negligible, as often assumed in many studies. In addition, a …

Mud Loss Estimation Using Machine Learning Approach, Abo Taleb T. Al-Hameedi, Husam H. Alkinani, Shari Dunn-Norman, Ralph E. Flori, Steven Austin Hilgedick, Ahmed S. Amer, Mortadha Alsaba

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Lost circulation costs are a significant expense in drilling oil and gas wells. Drilling anywhere in the Rumaila field, one the world's largest oilfields, requires penetrating the Dammam formation, which is notorious for lost circulation issues and thus a great source of information on lost circulation events. This paper presents a new, more precise model to predict lost circulation volumes, equivalent circulation density (ECD), and rate of penetration (ROP) in the Dammam formation. A larger data set, more systematic statistical approach, and a machine-learning algorithm have produced statistical models that give a better prediction of the lost circulation volumes, ECD, …

Searches For Gravitational Waves From Known Pulsars At Two Harmonics In 2015-2017 Ligo Data, B. P. Abbott, R. Abbott, T. D. Abbott, Marco Cavaglia, For Full List Of Authors, See Publisher's Website.

Physics Faculty Research & Creative Works

We present a search for gravitational waves from 221 pulsars with rotation frequencies ≳ 10 Hz. We use advanced LIGO data from its first and second observing runs spanning 2015-2017, which provides the highest-sensitivity gravitational-wave data so far obtained. In this search we target emission from both the l = m = 2 mass quadrupole mode, with a frequency at twice that of the pulsar's rotation, and the l = 2, m = 1 mode, with a frequency at the pulsar rotation frequency. The search finds no evidence for gravitational-wave emission from any pulsar at either frequency. For the l …

Towards Developing Visual Statistical Cues For Biodiversity, Abundance, Biomass Around Mariana Trench In An Embeddable Smart Module, Xiaoyu Li, Shidong Ren, Xue Geng, Hui He, Amaury Lendasse, Rui Nian

Engineering Management and Systems Engineering Faculty Research & Creative Works

Most Ecosystems in Mariana Trench, Still Remain Unexplored or Poorly Known. Recently, Advanced Underwater Vision Systems, Especially Those Deployed by the Remotely Operated Vehicles (Rov) and Autonomous Underwater Vehicles (AUV), Provide Us More Possibilities to Have a Closer Observation on the Deep-Sea Environments, Communities, Lifestyles, Even Behaviors of the Inhabitants. However, Online Visual Understanding is Still a Big Challenge in These Deepest Spots of the Ocean, Due to the Lack of Prior Knowledge, Poor Visibility, and Dynamic Investigation. in This Paper, We Are Trying to Make a Further Step to Develop Ecological Indicators in an Embeddable Smart Module, Capturing Visual …

Bolstering Career Opportunities For Stem University Graduates With Russianfor Stem University Graduates, Irina V. Ivliyeva

Arts, Languages and Philosophy Faculty Research & Creative Works

No abstract provided.

Influence Of Frictional Or Rotational Kinetic Energy On Wellbore-Fluid/Temperature Profiles During Drilling Operations, Ahmed Q. Al Saedi, Ralph E. Flori, C. Shah Kabir

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Temperature-profile distributions in a wellbore during drilling operations might take different forms when applying the energy balance in the overall system. For steady-state conditions, wherein the wellbore is considered a closed system, adding any source of additional energy to this system can influence the predicted temperature profiles. This study presents a new analytical model to investigate the influence of rotational energy arising from the drillstring operation on the wellbore-temperature behavior.

A significant part of the drilling operation is rotation of the drillstring. Depending on the drilling rig, various equipment provides this kind of energy, such as the rotary table or …

Silicon Nitride Stress Liner Impacts On The Electrical Characteristics Of Algan/Gan Hemts, Wei Chih Cheng, Tao Fang, Siqi Lei, Yunlong Zhao, Minghao He, Mansun Chan, Guangrui Maggie Xia, Feng Zhao, Hongyu Yu

Electrical and Computer Engineering Faculty Research & Creative Works

Due to the piezoelectric nature of GaN, the two-dimensional electron gas (2DEG) in AlGaN/GaN high electron mobility transistor (HEMT) could be engineered by strain. In this work, SiNx deposited using dual-frequency plasma-enhanced chemical vapor deposition (PECVD) was used as a stressor. The output performance of the devices was dominated by the surface passivation instead of the strain effect. However, the threshold voltage was increased by the liner-induced strain, supporting strain engineering as an effective approach to pursue the normally-off operation of AlGaN/GaN HEMTs.

Follow-Up And Kinetic Model Selection Of Dinitro Pentamethylene Tetramine (Dpt), Hany A. Elazab, M. M. Seleet, Said M.A. Hassanein, M. A. Radwan, M. A. Sadek

Chemical and Biochemical Engineering Faculty Research & Creative Works

The Synthetic route of Cyclotetramethylene Tetramine is implemented through the reaction of hexamine and nitrating mixture that is formed as a result of a reaction between ammonium nitrate and fuming nitric acid. The reaction medium includes acetic acid, acetic anhydride and p-formaldehyde. This synthetic pathway is relatively long and both of hexamine dinitrate and Dinitro Pentamethylene Tetramine (DPT) are considered as the two main intermediate compounds. The former compound (hexamine dinitrate) was prepared, purified, and then characterized. Conversion of hexamine dinitrate into DPT has been followed up experimentally at different temperatures. Various factors including temperature and time has been investigated. …

Estimation Of The Region Of Attraction Of Underactuated Systems And Its Enlargement Using Impulsive Inputs, Nilay Kant, Ranjan Mukherjee, Dhrubajit Chowdhury, Hassan K. Khalil

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Stabilization of an equilibrium point is an important control problem for underactuated systems. For a given control design, the ability of the system to remain stable in the presence of disturbances depends on the size of the region of attraction of the stabilized equilibrium. The sum of squares and trajectory reversing methods are combined together to generate a large estimate of the region of attraction. Then, this estimate is effectively enlarged by applying the impulse manifold method, which can stabilize equilibria from points lying outside the estimated region of attraction. In this paper, the generality of the approach is demonstrated …

The Effect Of Testing Conditions On The Performance Of Lost Circulation Materials: Understandable Sealing Mechanism, Montri Jeennakorn, Mortadha Alsaba, Runar Nygaard, Arild Saasen, Olav Magnar Nes

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

Lost circulation materials (LCMs) are added to drilling fluids to mitigate lost circulation (LOC) problems. Designing the fluid requires a good understanding of sealing mechanisms and all the parameters affecting the sealing performance. Laboratory testing apparatus is the key concept for LCM evaluation ensuring successful treatment. The high-pressure test cell containing fracture discs is an effective tool among the broadly designed apparatus. A variety of formulations has been developed from the LCM physical properties. Recently, the testing conditions such as the slot wall angles, and the fracture disc thickness were found to have significant effects on the evaluation results. However, …

Uav/Satellite Multiscale Data Fusion For Crop Monitoring And Early Stress Detection, V. Sagan, M. Maimaitijiang, P. Sidike, M. Maimaitiyiming, H. Erkbol, S. Hartling, K. T. Peterson, J. Peterson, Joel Gerard Burken, F. Fritschi

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Early stress detection is critical for proactive field management and terminal yield prediction, and can aid policy making for improved food security in the context of climate change and population growth. Field surveys for crop monitoring are destructive, labor-intensive, time-consuming and not ideal for large-scale spatial and temporal monitoring. Recent technological advances in Unmanned Aerial Vehicle (UAV) and high-resolution satellite imaging with frequent revisit time have proliferated the applications of this emerging new technology in precision agriculture to address food security challenges from regional to global scales. In this paper, we present a concept of UAV and satellite virtual constellation …