Engineering Commons^™

A Preconditioned Lattice Boltzmann Flux Solver For Steady Flows On Unstructured Hexahedral Grids, Brendan Walsh, Fergal Boyle

Articles

The lattice Boltzmann flux solver (LBFS), first introduced by Shu et al. (2014) on structured meshes, allows fluid flow problems to be solved on unstructured meshes discretised by the finite volume method. The solver calculates the macroscopic fluxes at the cell interfaces from a local reconstruction of the lattice Boltzmann solution. In this paper the LBFS is extended to three-dimensional unstructured hexahedral meshes and a preconditioned lattice Boltzmann flux solver (PLBFS) is presented. The PLBFS involves applying the preconditioning technique proposed by Guo (2004) to the LBFS and is achieved by modifying the equilibrium distribution function used to calculate the …

Is It Time To Give Athletes A Voice In The Dissemination Strategies Of Concussion-Related Information? Exploratory Examination Of 2444 Adolescent Athletes, Mark Beakey, Brian Keenan, Stephen Tiernan, Kieran Collins

Other Resources

Objective: The objective of the research was to screen male and female adolescent athletes on their concussion educational histories and preferred future methods of education in terms of educational messenger, modality, and concussion-related areas of interest.

Design: Cross-sectional survey.

Setting: Examination setting within the classroom.

Participants: Adolescent male (n = 1854) and female (n = 590) athletes aged 12 to 18 years.

Main outcome measures: To explore the concussion educational histories and preferred future methods of education in Irish male and female adolescent athletes.

Results: 19.7% (n = 482) of the sample received education in the past 12 months. Male …

Developing An Inclusive K-12 Outreach Model, Karen Nolan, Roisin Faherty, Keith Quille, Brett A. Becker, Susan Bergin

Conference Papers

This paper outlines the longitudinal development of a K-12 outreachmodel, to promote Computer Science in Ireland. Over a three-yearperiod, it has been piloted to just under 9700 K-12 students fromalmost every county in Ireland. The model consists of a two-hourcamp that introduces students to a range of Computer Sciencetopics: addressing computing perceptions, introduction to codingand exploration of computational thinking. The model incorporateson-site school delivery and is available at no cost to any interestedschool across Ireland. The pilot study so far collected over 3400surveys (pre- and post-outreach delivery).Schools from all over Ireland self-selected to participate, includ-ing male only, female only and …

Named Entity Recognition In Spanish Biomedical Literature: Short Review And Bert Model, Liliya Akhtyamova

Conference Papers

Named Entity Recognition (NER) is the rst step for knowledge acquisition when we deal with an unknown corpus of texts. Having received these entities, we have an opportunity to form parameters space and to solve problems of text mining as concept normalization, speech recognition, etc. The recent advances in NER are related to the technology of word embeddings, which transforms text to the form being effective for Deep Learning. In the paper, we show how NER detects pharmacological substances, compounds, and proteins in the dataset obtained from the Spanish Clinical Case Corpus (SPACCC). To achieve this goal, we use contextualized …

Land-Based Wind Energy Cost Trends In Germany, Denmark, Ireland, Norway, Sweden And The Unitedstates, Aidan Duffy, Maureen Hand, Ryan Wiser, Eric Lantz, Alberto Dalla Riva, Volker Berkhout, Maria Stenkvist, David Weir, Roberto Lacal-Arántegui

Articles

This paper presents work by the International Energy Agency’s Task 26 ‘Cost of Wind Energy’ on technological and cost trends in land-based wind energy in six participating countries (Denmark, Germany, Ireland, Norway, Sweden, United States) and the European Union between 2008 and 2016. Results indicate that there is a general trend towards larger, taller machines with lower specific powers resulting in higher capacity factors, despite small falls in new site wind resources in most countries, while wind project capital costs and project finance costs also fell. This resulted in an average levelized cost of energy (LCOE) fall of 33% for …

Experimental Evaluation Of Medium-Voltage Cascode Gallium Nitride (Gan) Devices For Bidirectional Dc–Dc Converters, Salah Salem H. Alharbi

Electronic Theses and Dissertations

As renewable energy sources, such as photovoltaic (PV) cells and wind turbines, are rapidly implemented in DC microgrids, energy storage systems play an increasingly significant role in ensuring uninterrupted power supply and in supporting the reliability and stability of microgrid operations. Power electronics, especially bidirectional DC–DC converters, are essential parts in distributed energy storage and alternative energy systems because of their grid synchronization, DC power management, and bidirectional power flow capabilities. While there is increasing demand for more efficient, compact, and reliable power converters in numerous applications, most existing power converters are hindered by traditional silicon (Si) based semiconductors, which …

Annual Report 2019-2020, Depaul University College Of Computing And Digital Media

CDM Annual Reports

LETTER FROM THE DEAN

As I write this letter wrapping up the 2019-20 academic year, we remain in a global pandemic that has profoundly altered our lives. While many things have changed, some stayed the same: our CDM community worked hard, showed up for one another, and continued to advance their respective fields. A year that began like many others changed swiftly on March 11th when the University announced that spring classes would run remotely. By March 28th, the first day of spring quarter, we had moved 500 CDM courses online thanks to the diligent work of our faculty, staff, …

Perceived Importance And Levels Of Technical English Communication Skills Among Stakeholders In Engineering Fields, Roger Tsz Ho Ng, Alex Ying Yin Wong

Faculty of Science & Technology (THEi)

The purposes of this study were to examine stakeholders’ perceptions of the importance of technical English communication skills in engineering and academic teachers and industry professionals’ perceptions of current engineering students’ and graduates’ levels of technical communication skills. Survey questionnaires were designed to collect data from different research participants. The data were subsequently analysed using descriptive statistics. The study identified a discrepancy between students’ self-perceived performance on technical English communication skills and their perceived standards of these skills required by the programmes in which they were enrolled. Technical communication skills, including writing in engineering genres, essays and technical reports, reading …

Enhancing Protection Of Vehicle Drivers And Road Safety By Deploying Adas And Facial Features Pattern Analysis (Ffpa) Technologies, Raymond Sze Wai Fu, Xueying Wang, Antonio Wong, Chi-Wing Tsang

Faculty of Science & Technology (THEi)

The latest technology associated with Intelligent Transportation Systems (ITS) have been designed with the aim to minimize the numbers of person injury in road accidents and improve the overall road safety. The driver behavior is one major concern in many accidents in HK urban road links. In particular, the driver's attitudes, such as fatigue, drowsiness and concentration are the major causes to road accidents. It will affect the driver's ability and decisions in properly controlling their vehicles. Very often, this kind of driver distraction is particularly obvious when driving after 2 to 3 hours from most research sources. In the …

An Experimental Study To Measure The Concentration Of Nanofluids By Using Refractive Index, Kwan Ng, Man Hei Chau

Staff Publications

In a decade, nanofluids are a new kind of fluid that has rapid development and wide application in various fields. Especially, nanofluids as a heat transfer fluids in different industrial instead of the traditional heat transfer fluids such as water, oil, and ethylene glycol…etc. The nanofluids have consisted the nano-size metal or metal oxide pArticles with base fluids, the nanoparticles have a superior thermo property to enhance the heat transfer performance of based fluids. Concentration is an important factor that can be influenced by most of the thermal properties of nanofluids. In present, the concentration of nanofluids is predetermined, the …

Information Visualization Of Metacognitive Skills During The Software Development Process Based On An Adapted Engineering Design Metacognitive Questionnaire, R. R. Adisurya, H. B. Santoso, S. Fadhilah, Oenardi Lawanto

Engineering Education Faculty Publications

In software development, either alone or in a team, there are many aspects that determine the success in developing the software, including each developer's skills. Studies show that the application of metacognition can increase the effectiveness and efficiency of software development. To measure a metacognition skill, there need to be a metacognition measurement tools. One example of this measurement method is adapted engineering design metacognitive questionnaire. However, the respondents feel that existing tools still have not given them any benefits. This research is conducted to develop an information visualization tools for the metacognition measurement from an adapted engineering design metacognitive …

Seed-Mediated Crystallization Of Charge-Transfer Complexes And Their Applications For Gas Sensing, Xuecheng Yu

Wayne State University Dissertations

The dissertation focused on controllable seed-mediated nucleaton of charge transfer complex, namely tetrathiafulvalene bromide ((TTF)Br) and Krogmann’s salts (KCP), and their applications in sensing. On gold nanoparticle (AuNP) decorated highly oriented pyrolytic graphite (HOPG) substrate, the presence of AuNP promotes the formation of charge transfer salt nanowires. The size of these nanowires, both (TTF)Br and KCP, were found to be confined by the size of AuNPs, shown by SEM and AFM characterization. On micro-disk electrodes, charge transfer salt nanowires were found to own a linear time dependency, by both SEM and in-situ optical microscopy. The micro-disk electrodes promoted higher crystallization …

Timcc: On Data Freshness In Privacy-Preserving Incentive Mechanism Design For Continuous Crowdsensing Using Reverse Auction, Xiaoqiang Ma, Weiwei Deng, Feng Wang, Menglan Hu, Fei Chen, Mohammad Mehedi Hassan

Faculty and Student Publications

© 2013 IEEE. As an emerging paradigm that leverages the wisdom and efforts of the crowd, mobile crowdsensing has shown its great potential to collect distributed data. The crowd may incur such costs and risks as energy consumption, memory consumption, and privacy leakage when performing various tasks, so they may not be willing to participate in crowdsensing tasks unless they are well-paid. Hence, a proper privacy-preserving incentive mechanism is of great significance to motivate users to join, which has attracted a lot of research efforts. Most of the existing works regard tasks as one-shot tasks, which may not work very …

Inexpensive Fluid Flow Visualization In A Microfluidic Channel Experiment Overview, Maoling Chu

Bridges: A Journal of Student Research

Flow visualization is vital to describe the motion of a fluid in microfluidic channels. This paper summarizes and lists systems based on two common visualization technique categories: particle-based techniques and scalar-based techniques. For this experiment, microfluidic channels were created using PDMS (polydimethylsiloxane). Based on our results and many fabrication trials, it was difficult to say whether this experiment was easy or inexpensive. If the first channel made by the researchers had successfully worked, it would have been clear that utilizing PDMS to fabricate a microfluidic channel for flow visualization was cheap and easy. However, no fully successful microfluidic chips were …

Using Mechanics Of A Double Pendulum To Maximize Sport Performance, Heston Neal

Bridges: A Journal of Student Research

Sports have developed over time into an entire industry from the children who grow up playing sports to the professional players that fans love to watch. Because all sports involve movements of the human body, a bio-mechanical system, these movements may be modeled with mathematics and physics. Specifically, the sports of golf, tennis, and baseball can use the concepts of a double pendulum to maximize sport performance. The double pendulum model is applied to these sports by making the arm one pendulum and the club, racquet, or bat the second pendulum. A good understanding of the mechanics of a double …

Promoting A Growth Mindset In Cs1: Does One Size Fit All? A Pilot Study, Keith Quille, Susan Bergin

Conference Papers

This paper describes a pilot intervention conducted in CS1, in the
academic year of 2016-2017. The intervention was based on the
work of Dweck, promoting a growth Mindset in an effort to in-
crease performance in introductory programming. The study also
examined data from a previous year (as a control group) to compare
and contrast the results. Multiple factors related to programming
performance were recorded with the control and treatment group,
which were measured at multiple intervals throughout the course,
to monitor changes as the pilot intervention was implemented.
This study found a significant increase in programming perfor-
mance when …

Designing New Generations Of Bcc Lattice Structures And Developing Scaling Laws To Predict Compressive Mechanical Characteristics And Geometrical Parameters, Hasanain Abdulhadi

Browse all Theses and Dissertations

Lattice structures (LSs) have been exploited for wide range applications including mechanical, thermal, and biomedical structures because of their unique attributes combining the light weight and relatively high mechanical properties. The first goal of this research is to investigate the effect of strut orientation and length on the compressive mechanical characteristics of body centered cubic (BCC) LS subjected to a quasi-static axial compressive loading using finite element analyses (FEA). In this study, two lattice generations were built and analyzed in commercial finite element (FE) software, ABAQUS/CAE 2016 using “smart procedure”, a meshing technique which was developed for this research to …

Tolle Lege Works Published In 2020, Mcquade Library

Bibliographies

Compiled Tolle Lege bibliography of works published by members of the Merrimack College Community in 2020. Works include journal articles, books, book chapters, conference presentations and posters, and more.

Comparison Of Seldm Simulated Total-Phosphorus Concentrations With Ecological Impervious-Area Criteria, Lillian C. Jeznach, Gregory E. Granato

Engineering, Computing & Construction Management Faculty Publications

Ecological studies indicate that impervious cover (IC) greater than approximately 5%–20% may have adverse effects on receiving-stream ecology. It is difficult to separate the effects of runoff quality from other effects of urbanization on receiving streams. This study presents the results of a numerical experiment to assess the effects of increasing IC on water quality using the Stochastic Empirical Loading and Dilution Model (SELDM). Hydrologic and physiographic variables representative of southern New England were used to simulate receiving water quality in a basin with IC ranging from 0.1% to 30%. Simulation results mirror the results of ecological studies; event mean …

Peer-Prompted Engineering Design: How Do Adolescents Interact And Strategize?, Kristin Marie Strong, Oenardi Lawanto, Amy Wilson-Lopez

Engineering Education Faculty Publications

Engineering design was integrated into K–12 science education in the Next Generation Science Standards (NGSS Lead States, 2013), but teaching design remains a challenge for educators. Design problems are ill-defined, ill-structured, and complex problem-solving tasks. Their solutions require creativity and recursive, metacognitive processes that cannot be taught with simple algorithms. Moreover, adolescents do not demonstrate fully developed metacognitive skills because they are undergoing profound developmental changes. In this comparative case study, we explored how peer-delivered metacognitive prompts supported adolescents during a design challenge. We investigated how scripted prompts sparked reflection and stimulated design changes and identified which prompts were most …

Using Strontium Coated Clay Nanoparticles For Bone Regeneration And Other Biomedical Applications, Anusha Elumalai

Doctoral Dissertations

The aim of this project is to coat halloysite nanotubes (HNTs) with strontium in an ecofriendly, simple, and non-expensive process. These particles, when doped in calcium phosphate cements (CPC), are predicted to increase the osteoconductive and antibacterial properties of three dimensional (3D) printed bone scaffolds.

The purpose of the 3D printed bone scaffolds is to assume the same function as the bones they are replacing but with several additional functionalities. These biomaterials will have the ability to be resorbed as new bone is formed. Due to inherent osteogenic factors and antibiotics released from doped HNTs during the reparative process, it …

A Drift-Resilient And Degeneracy-Aware Loop Closure Detection Method For Localization And Mapping In Perceptually-Degraded Environments, Kamak Ebadi

Engineering Ph.D. Theses

Enabling fully autonomous robots capable of navigating and exploring unknown and complex environments has been at the core of robotics research for several decades. Mobile robots rely on a model of the environment for functions like manipulation, collision avoidance and path planning. In GPS-denied and unknown environments where a prior map of the environment is not available, robots need to rely on the onboard sensing to obtain locally accurate maps to operate in their local environment. A global map of an unknown environment can be constructed from fusion of local maps of temporally or spatially distributed mobile robots in the …

Maker Fridays: Engaging Rural And Underrepresented High School Students In Pre-Engineering Design And Creativity, Michelle Howell-Smith, Kirstie Bash

Nebraska Center for Research on Children, Youth, Families, and Schools: Faculty Publications

The engineering field struggles to develop sufficient interest and sustained participation across underrepresented demographic groups including women and individuals from rural, Hispanic, or Native American origin. It is critical to foster interest in engineering during formative years when students are deciding career paths. Northeast Community College (Northeast) addressed the shortage of diverse students entering into engineering fields by developing a course to engage rural and underrepresented high school students in maker design and creativity and to determine best practices that attract and retain these students. The Maker Fridays pre-engineering course was part of the Fridays@Northeast program that targets high school …

The Impact Of Scaffolded Writing Instruction On Followup Course Assignments, Daniel Kawano

Faculty Publications - Mechanical Engineering

No abstract provided.

Learning To Jump Like Corbin Bleu: The Physics Behind Jump Rope, Caroline Camfield

Mahurin Honors College Capstone Experience/Thesis Projects

This project seeks to determine how engineering can be applied to the sport of jump rope so that athletes may better understand the science behind the sport and apply it to improve their performance in “speed jumping.” This style of jump rope consists of a jumper alternating their feet, with the rope passing under them with each step. Several types of ropes, handles, rope lengths, and widths between a jumper’s handles were tested to determine correlations between each variable and different STEM concept. These findings were then transitioned into a lesson plan so that both the jumpers and coaches could …

Influence Of Graphene Oxide And Carbon Nanotubes On The Fatigue Properties Of Silica/Styrene-Butadiene Rubber Composites Under Uniaxial And Multiaxial Cyclic Loading, Zongchao Xu, Stephen Jerrams, Hao Guo, Yanfen Zhou, Liang Jiang, Yangyang Gao, Liqun Zhang, Li Liu, Shipeng Wen

Articles

The influence of equivalent replacement of silica (SiO2) by carbon nanotubes (CNT) or graphene oxide (GO) on the microstructure, mechanical and fatigue behaviors of SiO2/styrene-butadiene rubber (SBR) composites was investigated. Results showed that the synergistic effect between CNT (or GO) and SiO2 was beneficial for the filler network and improved the mechanical properties of SBR composites. Furthermore, the introduction of CNT (or GO) led to low crack growth rates and the crack propagation tips were easy to deflection. Under multiaxial fatigue conditions, the maximum engineering stress was determined to be a reliable fatigue life predictor for SBR composites.

Effects Of Fiber Density And Strain Rate On The Mechanical Properties Of Electrospun Polycaprolactone Nanofiber Mats., Adriano A Conte, Katie Sun, Xiao Hu, Vincent Beachley

Henry M. Rowan College of Engineering Departmental Research

This study examines the effects of electrospun polycaprolactone (PCL) fiber density and strain rate on nanofiber mat mechanical properties. An automated track collection system was employed to control fiber number per mat and promote uniform individual fiber properties regardless of the duration of collection. Fiber density is correlated to the mechanical properties of the nanofiber mats. Young's modulus was reduced as fiber density increased, from 14,901 MPa for samples electrospun for 30 s (717 fibers +/- 345) to 3,615 MPa for samples electrospun for 40 min (8,310 fibers +/- 1,904). Ultimate tensile strength (UTS) increased with increasing fiber density, where …

Upgrading The Capstone Projects: The Engineering Clinic Model, Smitesh Bakrania, Ratneshwar Jha

Henry M. Rowan College of Engineering Departmental Research

Capstone engineering design projects are ideal for broad application of engineering concepts on open-ended research and design problems. These projects allow students to reinforce their skills and extend their expertise into specialized areas of interest. Often, the capstone projects serve as both test grounds and launch pads for students’ engineering careers. Within the engineering curriculum, these projects typically span the final year of an engineering program and entail a single project within a single disciplinary area. While their significance to the educational experience is unequivocal, the benefits of a capstone project can be expanded to further reflect real-world experiences. Over …

Automated Recognition Of Facial Affect Using Deep Neural Networks, Behzad Hasani

Electronic Theses and Dissertations

Automated Facial Expression Recognition (FER) has been a topic of study in the field of computer vision and machine learning for decades. In spite of efforts made to improve the accuracy of FER systems, existing methods still are not generalizable and accurate enough for use in real-world applications. Many of the traditional methods use hand-crafted (a.k.a. engineered) features for representation of facial images. However, these methods often require rigorous hyper-parameter tuning to achieve favorable results.

Recently, Deep Neural Networks (DNNs) have shown to outperform traditional methods in visual object recognition. DNNs require huge data as well as powerful computing units …

Example Take-Home Final Exam Questions From Cee 433: Water Technology & Policy At The University Of Illinois At Urbana-Champaign, Ashlynn Stillwell

All ECSTATIC Materials

The following example questions were part of take-home final exams spanning 2014-2020 in CEE 433: Water Technology & Policy, taught by Dr. Ashlynn S. Stillwell at the University of Illinois at Urbana-Champaign. These questions were part of the take-home final exam, with additional questions not reported here.