The University of Akron
California Polytechnic State University - San Luis Obispo
West Kentucky Community and Technical College
Liberty University
Cornell University
Santa Clara University
University of Pennsylvania
Brigham Young University
Utah State University
External Direct Sum Invariant Subspace And Decomposition Of Coupled Differential-Difference Equations,
2024
Southern Illinois University Edwardsville
External Direct Sum Invariant Subspace And Decomposition Of Coupled Differential-Difference Equations, Keqin Gu, Huan Phan-Van
SIUE Faculty Research, Scholarship, and Creative Activity
This article discusses the invariant subspaces that are restricted to be external direct sums. Some existence conditions are presented that facilitate finding such invariant subspaces. This problem is related to the decomposition of coupled differential-difference equations, leading to the possibility of lowering the dimensions of coupled differential-difference equations. As has been well documented, lowering the dimension of coupled differential-difference equations can drastically reduce the computational time needed in stability analysis when a complete quadratic Lyapunov-Krasovskii functional is used. Most known ad hoc methods of reducing the order are special cases of this formulation.
Dynamics And Steering Of A Vibration-Driven Bristle Bot In A Pipe System,
2023
Clemson University
Dynamics And Steering Of A Vibration-Driven Bristle Bot In A Pipe System, Ian Stewart
All Theses
Soft vibrational robots are robots that incorporate compliant structures into their design and are driven by oscillating actuators. A recent, popular version of a soft vibrational robot is the bristle bot, which uses flexible bristles and a vibration motor to propel itself across surfaces and through pipes. This motion is primarily driven by stick-slip dynamics resulting from asymmetric frictional forces applied at the bristle tips. Depending on the frequency of vibration of the motor, the robot experiences various resonance regions allowing it to maneuver in different directions. Attaching bristles to all sides of the robot and placing it in a …
Cislunar Navigation Techniques And Navigation Performance Optimization,
2023
Utah State University
Cislunar Navigation Techniques And Navigation Performance Optimization, Quinn P. Moon
All Graduate Theses and Dissertations
Nova-C is a lunar lander developed by the private company Intuitive Machines to deliver commercial payloads to the Moon. The IM-1 mission set for 2023 will launch and land the Nova-C near the Moon's south pole. In this research, various navigation techniques are explored to determine the lander's position and velocity during key segments. This process is studied for key mission events including trajectory correction maneuvers (TCMs), lunar orbit insertion (LOI), and descent orbit insertion (DOI). Each mission segment, referred to as an Orbit Determination Segment (OD), is analyzed with three different navigation techniques: Monte Carlo Analysis, Linear Covariance Analysis, …
The Effect Of Current Density And Hard Chrome Coating Duration On The Mechanical And Tribological Properties Of Aisi D2 Steel,
2023
Universitas Indonesia
The Effect Of Current Density And Hard Chrome Coating Duration On The Mechanical And Tribological Properties Of Aisi D2 Steel, Indah Uswatun Hasanah, Dedi Priadi, Donanta Dhaneswara
Journal of Materials Exploration and Findings (JMEF)
The effect of hard chromium coating on AISI D2's mechanical properties and wear resistance has been investigated using the electrolysis technique with varying current and coating duration. The variations of current used are 0.8 A, 1.2 A, and 1.6 A, while the coating duration used are 300, 600 and 900 seconds. Characterization of the films was conducted using SEM-EDS, and XRD. It can be observed from SEM characterization that the chrome grains resulted from the electroplating process are fine. The XRD identify chrome compund on the surface coating. The highest hardness value was 520.6 HV on a sample with a …
Effect Of Heat Input On Microstructure And Mechanical Properties Of Submerged Arc Welded Sm570-Tmc Steel,
2023
Department of Metallurgical and Materials Engineering, Faculty of Engineering, Univeristas Indonesia, Depok, 16424, Indonesia
Effect Of Heat Input On Microstructure And Mechanical Properties Of Submerged Arc Welded Sm570-Tmc Steel, Toni Yuhandri, Winarto Winarto, Diana Natalia
Journal of Materials Exploration and Findings (JMEF)
SM570TMC is high-strength steel (HSS), which is commonly used in structures that require higher-strength components. In this research, submerged arc welding (SAW)-welded SM570 TMC steels' microstructure and mechanical characteristics were examined. SM570 plates with 12mm thickness were multi-pass welded by using a 3.0 mm diameter of ESAB OK Autrod 13.40 (AWS A5.23: EG) filler metal. The joint design is a single V multi-pass butt weld with a backing strip. Two welded joints were prepared by using heat inputs of 2.2 and 2.9 kJ/mm. The microstructures of two welded joints were observed by using optical microscopy and scanning electron microscope (SEM). …
The Effect Of Heat Treatment And Chemical Treatment On Natural Fibre To The Durability Of Wood Plastic Composites – A Review,
2023
Universiti Teknologi MARA Cawangan Pahang
The Effect Of Heat Treatment And Chemical Treatment On Natural Fibre To The Durability Of Wood Plastic Composites – A Review, Nuratiqah Asyiqin Mohd Nasharudin, Nur Fatihah Sulaiman, Nurul Aziemah Mohammad, Wan Nor Raihan Wan Jaafar, Falah Abu Dr., Siti Norasmah Surip
Journal of Materials Exploration and Findings (JMEF)
The application of WPC is not only limited to indoor applications but has been extended to exterior applications where properties of WPC could compromise during service life. WPC was derived from wood fiber of various sizes to reinforce polymers. Wood fiber has the advantage of a cheaper price, being abundantly available, and ease of processing, however, the critical factor is its hydrophilic nature, where moisture absorption is likely to occur. Thus, treatments for reducing the hydrophilicity of wood fibers are applied. By treatment of wood fiber, the surface impurities were removed, leaving the roughened surface of fibers, thus providing a …
Optimization Of Alti Pld Coating By Increasing Ti Content, N2 And Annealing Which Used For Skd61 Pins In Aluminum Die Casting,
2023
Material and Metallurgical Engineering Department, Faculty of Engineering, University of Indonesia, Indonesia
Optimization Of Alti Pld Coating By Increasing Ti Content, N2 And Annealing Which Used For Skd61 Pins In Aluminum Die Casting, Rusman Kosasih, Maria Margaretha Suliyanti Prof, Dedi Priadi, Wisnu Usni
Journal of Materials Exploration and Findings (JMEF)
The Alumunium Titanium Nitrogen (AlTiN) coating is known as one of the best coating materials for protective coating, while Pulsed Laser Deposition (PLD) is a laser coating process used for electric layer and superconductor applications, producing thin films up to 20 µm in thickness. The combination of these two matters has already been researched and is still in progress. One major challenge in the aluminium casting industry is to minimize the damage caused to tool steel pins made from SKD61, when aluminium material sticks to the pin, and halting production. Therefore, research on effective coatings for tool steels and testing …
Northrop Grumman Collaboration Project,
2023
California Polytechnic State University, San Luis Obispo
Northrop Grumman Collaboration Project, Nikkia Psomas-Sheridan, Santiago Robles, Ben Elkayam, Benjamin Ulfhake
Mechanical Engineering
The Northrop Grumman Collaboration Project (NGCP) is a collaborative club project sponsored by Northrop Grumman for the students of Cal Poly San Luis Obispo (CPSLO) and Cal Poly Pomona (CPP) to create a fleet of vehicles to aid in the simulated rescue of stranded hiker. The CPSLO club is responsible for delivering an autonomous flight vehicle that can suppress a fire and retrieve a payload. Mechanical Design Team of the CPSLO team was responsible for the design of the frame, electronics housing, and payload and fire suppression systems.
A Review Of Solar Hybrid Photovoltaic-Thermal (Pv-T) Collectors And Systems,
2023
Boise State University
A Review Of Solar Hybrid Photovoltaic-Thermal (Pv-T) Collectors And Systems, Todd Otanicar
Mechanical and Biomedical Engineering Faculty Publications and Presentations
In this paper, we provide a comprehensive overview of the state-of-the-art in hybrid PV-T collectors and the wider systems within which they can be implemented, and assess the worldwide energy and carbon mitigation potential of these systems. We cover both experimental and computational studies, identify opportunities for performance enhancement, pathways for collector innovation, and implications of their wider deployment at the solar-generation system level. First, we classify and review the main types of PV-T collectors, including air-based, liquid-based, dual air–water, heat-pipe, building integrated and concentrated PV-T collectors. This is followed by a presentation of performance enhancement opportunities and pathways for …
Algorithms For The Generalized Inverse Solution And Direct Solution: Using An Algebra Computer-Based System To Obtain Meridian Arc Length,
2023
Department of Merchant Marine, National Taiwan Ocean University, Keelung 20224, Taiwan.
Algorithms For The Generalized Inverse Solution And Direct Solution: Using An Algebra Computer-Based System To Obtain Meridian Arc Length, Wei-Kuo Tseng, King-Cheng Tsai, Chian Liou, Jiunn-Liang Guo, Yi-Jia Sun
Journal of Marine Science and Technology
In this study, the idea employed in the article of [1] to treat the problem of the arc-length of meridian is applied to the arc-length determined by the third flattening (n) instead of the eccentricity (e) of an Earth-reference ellipsoid . With WGS 84 ellipsoid datum used in modern navigation, the meridian arc-length is a crucial factor for map projections and geodetic and distance calculations such as Mercator charts, the universal transverse Mercator, great circle (ellipse), rhumb line, and geodesic. Because navigation software lacks officially standardized calculation methods, these “black box solutions” used in navigational systems are unknown. Therefore members …
Three-Dimensional Higher-Order Compressive Sensing For Raypath Separation In An Acoustic Waveguide,
2023
The Laboratory of Image Science and Technology, Southeast University, Nanjing 210096, China
Three-Dimensional Higher-Order Compressive Sensing For Raypath Separation In An Acoustic Waveguide, Fengyan Zhong
Journal of Marine Science and Technology
In an acoustic waveguide, the separation of multiple raypaths, especially close raypaths, is a challenging task in the presence of colored noise due to interference in the acoustic eld. In this paper, a three-dimensional higher-order compressive sensing method for raypath separation is proposed. The method is applied on an array-to-array experimental conguration where both emitter and reception arrays are used. With the array-to-array conguration, the raypaths are characterized by three parameters including arrival direction, departure direction, and arrival time. Furthermore, the performance of the proposed algorithm is illustrated by simulations and experiments. The numerical results based on simulation illustrate that …
Projection Of Sea Surface Temperature Based On Empirical Mode Decomposition And Its Application In Typhoon Number Forecast,
2023
Department of Harbor and River Engineering, National Taiwan Ocean University, Keelung, Taiwan, ROC
Projection Of Sea Surface Temperature Based On Empirical Mode Decomposition And Its Application In Typhoon Number Forecast, Wen-Cheng Huang, Jung-Chen Lee
Journal of Marine Science and Technology
The primary objective of this paper is to demonstrate the applicability of empirical mode decomposition (EMD) in projecting non-stationary daily sea surface temperature (SST) series, and the other is to apply the projected series of SST to estimate the number of typhoons. The study focuses on an area ranging from 5°N~25°N and 110°E~170°E, collecting daily sea temperature data and typhoons records within this region. The findings conclusively indicate that the EMD-based data generation method proposed in this paper can effectively addresses the limitations of previous hydrological models in generating non-stationary series, signifying a significant advancement in hydrological time series modeling …
The Potential Of The Implementation Of Offline Robotic Programming Into Automation-Related Pedagogy,
2023
CUNY, New York City College of Technology
The Potential Of The Implementation Of Offline Robotic Programming Into Automation-Related Pedagogy, Max Rios Carballo, Xavier Brown
Publications and Research
In this study, the offline programming tool RoboDK is used to program industrial robots for the automation sector. The study explores the feasibility of using this non-disruptive robot programming software for classroom use; assesses how well RoboDK can be used to program various robots used in the industry; creates and tests various applications; and pinpoints technical obstacles that prevent a smooth link between offline programming and actual robots. Initial results indicate that RoboDK is an effective tool for deploying its offline programming code to a Universal Robot, UR3e. There are many potential for advanced applications. The goal of the project …
Empowering Student Success: Unlocking The Potential Of Project-Based Steel Design Education,
2023
Louisiana State University
Empowering Student Success: Unlocking The Potential Of Project-Based Steel Design Education, Aly Mousaad Aly
Faculty Publications
In the pursuit of student success, it is essential to acknowledge that a singular teaching style does not universally cater to all students. The educator's crucial role lies in creating an optimal learning environment that fosters students' endeavors to excel. This endeavor transcends mere classroom success or employment prospects, encompassing a broader impact on societal well-being. An experiential learning approach, where students actively engage in practical tasks, emerges as the most effective mode of instruction. Integrating project-based learning activities into the curriculum holds immense potential for enhancing student learning. Additionally, the utilization of analysis software tools like FTool and STAAD …
Bend And Not Break: Examining Hispanic Engineering Student's Academic Challenges During Covid-19,
2023
The University of Texas Rio Grande Valley
Bend And Not Break: Examining Hispanic Engineering Student's Academic Challenges During Covid-19, Eleazar Marquez, Eleazar Marquez
Mechanical Engineering Faculty Publications and Presentations
Student success in higher education remains an area of interest, particularly for underrepresented minorities. Studies reveal that while Latino college enrollment has increased, retention rates continue to be an ongoing struggle. Several factors that attribute to such low rates include academic self-concept, family support, cognitive mapping, managing resources, background characteristics, and separation and maintenance of family ties. In the wake of COVID-19, most institutions responded by terminating in-person instruction, mandating to seek off-campus housing, and shifting to a fully remote context. As such, students were unable to utilize campus resources and engage in established educational campus practices. In this research …
Leveling The Playing Field: Enacting Equitable Pedagogy To Teach Rigid Body Dynamics,
2023
The University of Texas Rio Grande Valley
Leveling The Playing Field: Enacting Equitable Pedagogy To Teach Rigid Body Dynamics, Eleazar Marquez, Samuel Garcia
Mechanical Engineering Faculty Publications and Presentations
Research examining the quality of engineering programs across different instructions of learning has revealed that no two programs are alike. Each program has unique and distinctive features that influence the quality and rigor of education that students receive. Institutional culture, leadership, faculty preparedness, funding and many other factors influence program quality. Additionally, researchers have also noted that many institutional gaps and equity related issues are persistent and troublesome facets that further exacerbate the academic gaps in STEM education. It is within this context, that students attending top tier universities will likely have remarkedly vast academic experiences in terms of level …
Learning In Transition: Developing And Employing Pedagogical Supports To Enhance Student Learning In Engineering Education,
2023
The University of Texas Rio Grande Valley
Learning In Transition: Developing And Employing Pedagogical Supports To Enhance Student Learning In Engineering Education, Eleazar Marquez, Samuel Garcia
Mechanical Engineering Faculty Publications and Presentations
Scholarly research indicates that classroom environment and conditions influence the degree of student learning, levels of engagement, and overall success in engineering education. In the wake of COVID-19, educational institutions transitioned to fully online delivery that disrupted traditional and effective channels of communication enacted in classroom contexts. For a substantial number of faculty members, this rapid transition to a fully remote instructional context marked the start a novel style of teaching and learning environment, a grand departure from the traditional, direct face-to-face setting. Such rapid and disruptive change required creative solutions to routinized instructional practices and compelling faculty to adjust …
Keeping Calm And Staying Balanced: Exploring The Academic Pressures Faced By Engineering Students To Attain High Grades And Their Impact On Mental Health,
2023
The University of Texas Rio Grande Valley
Keeping Calm And Staying Balanced: Exploring The Academic Pressures Faced By Engineering Students To Attain High Grades And Their Impact On Mental Health, Eleazar Marquez, Samuel Garcia
Mechanical Engineering Faculty Publications and Presentations
Studies reveal that grades have a short-term impact on students’ self-efficacy, motivation, and decision making. Earning high grades has become a focal point for engineering students to secure three types of opportunities: internships, post-graduation employment, and graduate school acceptance. Nonetheless, the desire to attain a competitive grade-point-average may lead to negative psychosocial effects such as increased mental exertion, physical exhaustion, anxiety, and overall lack of work-life balance. In this paper, the authors extend their prior study on the impact of grades in engineering education. The first study was conducted in the spring of 2019 at a tier one, small private …
Mechanical Response Of The Craniofacial Skeleton To Subfracture Impacts In The Time And Frequency Domains,
2023
Western University
Mechanical Response Of The Craniofacial Skeleton To Subfracture Impacts In The Time And Frequency Domains, Paige Merko
Electronic Thesis and Dissertation Repository
Resonant frequencies have been suggested as a mechanism of brain injury since these vibrations can transfer energy into the brain. Study of the vibrational response of the craniofacial skeleton to impact is limited in literature. In this research, four cadaver specimens were impacted at five locations on the craniofacial skeleton. The mechanical response to each impact was compared in the time and frequency domains. Impacts to the maxilla and its associated soft tissues tended to be attenuated, while impacts to the cranial vault, specifically to the occipital, produced the most severe response. Results suggest that the facial skeleton and its …
Consumer 3d Printing For Remote Control Aircraft Wings: Development Of Novel Wingbox Structure,
2023
Portland State University
Consumer 3d Printing For Remote Control Aircraft Wings: Development Of Novel Wingbox Structure, Ian Clark
University Honors Theses
Remote control aircraft construction and can be a very expensive and time-consuming hobby. With 3D printer consumer adoption rates skyrocketing, there is a gap between demand for RC aircraft and suitable well-designed models available to creators and hobbyists. By creating and testing two iterations of wingbox geometries, this research aims to help close that gap by producing an easily printable wing structure. While there are improvements that can be made on this work, this research has been effective in generating a novel wingbox structure for FFF 3D printing that has distinct advantages over other designs currently available.
