Engineering Commons^™

Ferric Carbide Nanocrystals Encapsulated In Nitrogen-Doped Carbon Nanotubes As An Outstanding Environmental Catalyst, Chen Wang, Jian Kang, Ping Liang, Huayang Zhang, Hongqi Sun, Moses O. Tadé, Shaobin Wang

Research outputs 2014 to 2021

Nitrogen-doped carbon nanotubes encapsulating iron carbide (Fe₃C) nanocrystals (Fe₃C@NCNT) were fabricated by a simple and direct pyrolysis method using melamine and ferric chloride as the C, N and Fe precursors. The surface morphology, structure and composition of the Fe₃C@NCNT materials were thoroughly investigated. The nanomaterials were employed as novel catalysts for peroxymonosulfate (PMS) activation; outstanding efficiency, high stability and excellent reusability were observed in the catalytic oxidation of organics. The encapsulated Fe₃C nanoparticles played a key role in the emerging synergetic effects of the carbide and the protective graphitic layers. In addition, …

Wip: Introducing Engineering Principles Into Prek-6 Through A Service Learning Partnership, Stacie Ringleb, Jennifer Kidd, Pilar Pazos

Mechanical & Aerospace Engineering Faculty Publications

We report on an interdisciplinary projet in which pre-service teachers and engineering students worked collaboratively to design and deliver engineering lessons for elementary school students. We describe the approach and preliminary results for two participating populations: Freshmen engineering students and pre-service teachers. Specifically, we explored the following research questions 1) Does the development and implementation of engineering lessons for elementary students affect education students' a) knowledge of engineering; b) beliefs about the incorporation of engineering in elementary school instruction; and c) comfort and motivation teach engineering? 2) What do education and engineering students perceive as the benefits and challenges of …

The Andacollo's Mining Community: Ethnographic Work-Based Approach To Corporate Social Responsibility Policies And Practices, Ubirata De Oliveira

Walden Dissertations and Doctoral Studies

This ethnographic study was designed to explore the phenomenon of corporate social responsibility (CSR) in the mining industry. The research addressed the impacts of a problematic, systemic, and ethnocentric (top-down) CSR approach driven by a transnational mining company, and proposed a novel cultural relativist (bottom-up) CSR approach looking at the social needs of the community. Solving the problem stemming from the ethnocentric approach is important for both the mining company and the community affected by the CSR program, as it will alter dynamics between actors and mitigate social conflicts. The purpose of this study was to investigate factors that improve …

Software Modelling For Real World Faults On Ac Transmission Protective Systems Analysis And Effects, Iandale Tualla

Theses and Dissertations

The Electric Power Utilities serves many diverse customers from regular households to major processing plants that develop parts for gasoline vehicles. Those varying customer usages has adverse effects on the Electric Grid in many ways, that requires continuing analysis by the engineers and technical skills specialists who keep the Electric Grid stable. Several papers have been written about harmonics and Non- Sinusoidal waveforms and its effect on the Electric Grid. This thesis will exam a realworld fault event on a transmission line, its effects on the AC Transmission Protection Systems (TPS) that provides electrical energy to a nonlinear load, specifically …

Blind Change Point Detection And Regime Segmentation Using Gaussian Process Regression, Sourav Das

Theses and Dissertations

Time-series analysis is used heavily in modeling and forecasting weather, economics, medical data as well as in various other fields. Change point detection (CPD) means finding abrupt changes in the time-series when the statistical property of a certain part of it starts to differ. CPD has attracted a lot of attention in the artificial intelligence, machine learning and data mining communities. In this thesis, a novel CPD algorithm is introduced for segmenting multivariate time-series data. The proposed algorithm is a general pipeline to process any high dimensional multivariate time-series data using nonlinear non-parametric dynamic system. It consists of manifold learning …

Mobile Application For Shipping Goods For Individuals And Truckers In India, Sendurr Selvaraj

Theses and Dissertations

India is a vast country with majority of its cities and towns connected through roads. Road transportation contributes to 86% share of the freight transport of the country with trucking companies dominating the entire space. With growing economy and demands raising, the quality of service of the trucking company remains poor. The major reasons are unorganized practice and lack of transparency. Moreover, limited access for customers to reach out to truckers to transport their goods.

This thesis aims to create a platform for customers and truckers to realize their needs with a help of a mobile application. Customers can search …

Cable Health Monitoring System Built Into Power Converter Using Time Domain Reflectometry, Hossein Baninajar

Theses and Dissertations

Aging cables are a critical reliability concern for many electrical systems. Cables run over long distances, are often exposed to harsh environments and are intended to work for several decades. Cable faults can be a serious problem because cables are usually hard to repair or replace. Condition based maintenance is a popular approach that provides high reliability and low maintenance cost at the same time. This is a non-destructive method that collects information about the health condition of the cable under test without causing any potential damage.

Nowadays, in several applications power cables are connected to power converters and it …

Numerical Analysis Of Phase Change, Heat Transfer And Fluid Flow Within Miniature Heat Pipes, Mehdi Famouri

Theses and Dissertations

Heat pipes with broad applications in thermal systems have the ability to provide effective heat transport with minimal losses in over reasonable distances due to their passive nature. Their exceptional flexibility, simple fabrication, and easy control, not to mention, all without any external pumping power make them especially attractive in electronics cooling. Heat pipe development is motivated to overcome the need to presumably manage thermal dissipation in progressively compressed and higher-density microelectronic components, while preserving the components temperatures to specification.

Computation of flow and heat transfer in a heat pipe is complicated by the strong coupling among the velocity, pressure …

Supercritical Carbon Dioxide Treatment Of Natural Biomaterials For Tissue Engineering Applications, Dominic M. Casali

Theses and Dissertations

The number of people requiring an organ transplant in the United States has increased considerably over the past 25 years, but the number of organ donations has stagnated; over 8,000 people now die annually while awaiting a transplant or become too sick to receive one. Tissue engineering (TE), the design and production of artificial tissues and organs in vitro, has been proposed to alleviate this problem. Though synthetic polymers offer tunable mechanical and biochemical properties, natural biomaterials have recently garnered attention in TE for their high degree of biocompatibility and ability to direct cell proliferation and constructive tissue remodeling. Yet …

Modeling Battery Performance Due To Volume Change In Porous Electrodes Due To Intercalation, Taylor R. Garrick

Theses and Dissertations

The demand for energy continues to increase as the economies of developing countries become more modern and show an increased need for a reliable energy infrastructure in order to meet the increased demand associated with a large and more mobile population. An increased demand puts a strain on all sectors, however it is specifically noticeable in the transportation sector where a significant portion of the fuel utilized for transportation comes from petroleum and other fossil fuels. Recently, using alternative forms of energy for transportation has become reality, and in turn, using electricity as a transportation fuel has gained significant momentum, …

Rational Synthesis Of Catalysts For Biomass Conversion, Qiuli Liu

Theses and Dissertations

With climate change due to global warming, the production of hydrocarbon fuels and chemicals from renewable biomass resource has become more pressing in recent decades. The biggest challenge in biomass conversion is to develop active, selective and stable catalysts for particular applications. The objective of this research is to optimize catalytic performance for hydrodeoxygenation (HDO) and hydrogenation reactions by enhancing the stability of the support, tuning metal particle size, and controlling surface composition.

The high content of water in bio-oil and the aqueous environment of the upgrading process requires a hydrothermally stable catalyst. The hydrothermal stability has been effectively improved …

Experimental And Numerical Investigation Of Pressure Drop In Silicon Carbide Fuel Rod For Application In Pressurized Water Reactors, Ahmed Musafi Abir

Theses and Dissertations

Spacer grids are used in pressurized water reactors (PWRs) fuel assemblies which enhances heat transfer from fuel rods. However, there remain regions of low turbulence in between the spacer grids which contributes to lower heat transfer. To enhance turbulence in these regions surface roughness is applied on the fuel rod walls. Meyer et al [1] used empirical correlations to predict heat transfer and friction factor for artificially roughened fuel rod bundles at high performance light water reactors (LWRs). At present, several types of materials are being used for fuel rod cladding including zircaloy, uranium oxide, etc. But researchers are actively …

Far-Field Optical Microscopy Based On Stimulated Emission Depletion, Yunxia Wang

Theses and Dissertations

Conventional lens-based (far-field) fluorescence microscopy is a widely used imaging technique with spatial resolution up to 150–350 nm. However, this technology cannot discern very small structural features, because the spatial resolution is limited by diffraction to about half of the wavelength of light (λ/2，λ is the wavelength of light). Hence, most of the developments in microscopy aim at improving resolution. In the past decades, stimulated emission depletion (STED) microscopy has been developed to bypass the diffraction limit for the application in biological imaging with resolution approaching the nanoscale. The basic principle of STED microscopy is to employ a doughnut-shape laser …

Three Segment Adaptive Power Electronic Compensator For Non-Periodic Currents, Amin Ghaderi

Theses and Dissertations

In this dissertation, a new technique is proposed for the compensation of nonperiodic load current. The method provides control references for three co-located devices, each corresponding to one moving calculation window and one decomposed part of the compensated current. They are slow compensator with high power rating, large calculation window, and low switching frequency; fast compensator with lower power rating, shorter calculation window, and higher switching frequency; and the reactive compensator which is an ordinary static VAR compensator (SVC). To improve the flexibility of the technique, a fuzzy based adaptive window is proposed for the slow compensator to find the …

Minimum Time Control Of Paralleled Boost Converters, Shishir Patel

Dissertations, Master's Theses and Master's Reports

Demand for electrification is booming in both, traditional and upcoming generations of technological advancements. One of the constituent blocks of these electrified systems is Power conversion. Power conversion systems are often constructed by paralleling multiple power converter blocks for high performance and reliability of overall system. An advanced control technique is developed with an aim to optimize system states of heterogeneous power converters within minimum time while maintaining feasible stress level on individual power converter blocks. Practical implementation of real-time controller and performance improvement strategies are addressed. Experimental results validating high performance control scheme, and sensitivity analysis of system states …

Fea Analysis And Optimization Of Differential Housing For Fatigue Stresses And Fatigue Test Design To Study Skin Effect In Ductile Iron, Swapnil A. Pandey

Dissertations, Master's Theses and Master's Reports

Automotive emission standards are getting more stringent day by day and governments worldwide are moving to reduce emissions from automobiles. In this scenario reducing the weight of automobile components becomes an important design objective to reduce emissions. A 10% reduction of weight in the complete automobile leads to 6-8 percent improvement in mileage (Mhapankar 2015). Also, powertrain components make up for approximately 27% of the total automobile weight and thus optimizing the design of components in the powertrain is an important task (Mhapankar 2015). Statistics show that 26% of component failures in automobiles are part of powertrain and 21% of …

Electrospinning Novel Aligned Polymer Fiber Structures For Use In Neural Tissue Engineering, Rachel Martin

Dissertations, Master's Theses and Master's Reports

A suitable tissue scaffold to support and assist in the repair of damaged tissues or cells is important for success in clinical trials and for injury recovery. Electrospinning can create a variety of polymer nanofibers and microfibers, and is being widely used to produce experimental tissue scaffolds for neural applications. This dissertation examines various approaches by which electrospinning is being used for neural tissue engineering applications for the repair of injuries to the central nervous system (CNS) and the peripheral nervous system (PNS). Due to the poor regeneration of neural tissues in the event of injury, tissue scaffolds are being …

Lakebed Characterization Using Side-Scan Data For Investigating The Latest Lake Superior Coastal Environment Conditions, Hasan Salih Kulunk

Dissertations, Master's Theses and Master's Reports

This thesis provides a review of the development of hydrographic survey equipment and supporting geospatial equipment and technology such as GPS. Using SonarWiz, a sonar image processing software package, lakebed classification methodologies were evaluated for mapping Buffalo Reef in Lake Superior located near Gay, Michigan. The goal was to develop an approach to mapping the reef bed and delineating various components of the lake bottom, including stamp sands, which are migrating from the abandoned Gay copper processing stamp mill to the reef. This contamination of the reef is having an adverse effect on habitats important to local flora and fauna. …

A Testbed Design For Monitoring The Long-Term Spatial-Temporal Dynamics Of Underwater Acoustic Channels, Krishna Chaitanya Poduru

Dissertations, Master's Theses and Master's Reports

The underwater acoustic network testbed helps to validate the theoretical results and bridge the gap between experimental results. Characterizing and modeling the spatial-temporal dynamics of underwater acoustic channels is essential to developing efficient and effective physical-layer communication algorithms and network protocols. This work dedicates to designing a testbed system to measure the spatial-temporal dynamics of underwater acoustic channels. The collected measurements will shed insights into the spatial-temporal correlation of underwater acoustic channels and will be used to evaluate the theoretical algorithms that are designed to model the spatial-temporal dynamics and to exploit the spatial-temporal dynamics for more efficient and effective …

Polymer Waveguide Manufacturing And Printed Circuit Board Integration, Brandon Swatowski

Dissertations, Master's Theses and Master's Reports

In this age of ever increasing data rates in communication systems, optics are becoming more commonplace for long length (>10m) signal transmission in High Performance Computing (HPC) systems due to their bandwidth capabilities which are higher than their electrical counterparts. In these optical based communication systems, Vertical Cavity Surface Emitting Lasers (VCSELs) are the most commonly used communications lasing medium for multimode fiber applications. These lasers are active in the 850 nm region, with speeds commonly at 10 Gbps/channel. VCSEL vendors are now commercializing lasers at 25 Gbps/channel as well, with research groups actively pursuing rates beyond 40 Gbps/channel, …

A 3 D- Fem Study On The Stress Distributions In Pediatric Skull Due To Impact From Free Fall, Suryanshu Walvekar

Dissertations, Master's Theses and Master's Reports

Abstract

Brain is vulnerable to injuries even from low heights of fall. There are many infant casualties who get severe brain injury each year. This research is a simulated study of the stress patterns and values when human infant skull is subjected to free fall. The input velocity was calculated using simple free fall velocity formulas and was fed into the simulation. Model was meshed and refined using Hypermesh software. RADIOSS solver of the Hyperworks package was used to analyze and draw results for the simulation process. Various types of stresses and strains were extracted and plotted against respective drop …

Collaboration In Virtual Worlds: Impact Of Task Complexity On Team Trust And Satisfaction, Fiona Fui-Hoon Nah, Shu Schiller, Brian E. Mennecke, Keng Siau

Research Collection School Of Computing and Information Systems

Virtual worlds are three-dimensional, computer-generated worlds in which team collaboration can be facilitated through the use of shared virtual space and mediated using avatars. This article examines the effect of task complexity on team collaboration. A puzzle game in Second Life was used as the collaborative task and task complexity was manipulated by varying the number of pieces in the puzzle. The hypotheses are that task complexity influences team trust, and team trust influences team process satisfaction in virtual team collaboration. The experimental results indicate that task complexity has significant effects on team trust and team process satisfaction, and team …

Processing, Microstructure And Mechanical Properties Of Beta-Type Titanium Porous Structures Made By Additive Manufacturing, Yujing Liu

Theses: Doctorates and Masters

Tissue engineering through the application of a low modulus, high strength format as a potential approach for increasing the durability of bone implants has been attracting significant attention. Titanium alloys are widely used for biomedical applications because of their low modulus, high biocompatibility, specific strength and corrosion resistance. These reasons affirm why titanium alloy is selected as the specific material to research. The development of low modulus biomaterials is considered to be an effective method to remove the mismatch between biomaterial implants and surrounding bone tissue, thereby reducing the risk of bone resorption. So far, Ti–24Nb–4Zr–8Sn alloy (abbreviated hereafter as …

Resilience In Ecotoxicology: Toward A Multiple Equilibrium Concept, Mirco Bundschuh, Ralf Schulz, Ralf B. Schäfer, Craig R. Allen, David G. Angeler

School of Natural Resources: Faculty Publications

The term resilience describes stress-response patterns across scientific disciplines. In ecology, advances have been made to clearly define resilience based on underlying mechanistic assumptions. Engineering resilience (rebound) is used to describe the ability of organisms to recover from adverse conditions (disturbances), which is termed the rate of recovery. By contrast, the ecological resilience definition considers a systemic change, that is, when ecosystems reorganize into a new regime following disturbance. Under this new regime, structural and functional aspects change considerably relative to the previous regime, without recovery. In this context, resilience is an emergent property of complex systems. In the present …

15-13 Exploring Bicycle Route Choice Behavior With Space Syntax Analysis, Zhaocai Liu, Anthony Chen, Seungkyu Ryu

Transportation Research Center Reports

Cycling provides an environmentally friendly alternative mode of transportation. It improves urban mobility, livability, and public health, and it also helps in reducing traffic congestion and emissions. Cycling is gaining popularity both as a recreational activity and a means of transportation. Therefore, to better serve and promote bicycle transportation, there is an acute need to understand the route choice behavior of cyclists.

This project explored the applicability of using space syntax theory to model cyclists’ route choice behavior. In addition, several bicycle-related attributes were also considered as influential factors affecting cyclists’ route choice. A multiple regression model was built and …

14-03 Transportation System And Its Association With Human Health - A Review And Modeling Approach, Jun-Seok Oh, Valerian Kwigizile, Ali Hamzah Hussein Alzuhairi, Fnu Zahid

Transportation Research Center Reports

Transportation systems constitute of infrastructure, commute modes, land use and other policies. The purpose of transportation is to provide easy access to goods and services. While attaining this purpose, impacts of transportation on human health and well-being have been ignored to some extent. Recently, studies have begun analyzing the impact of transportation systems on quality of life and health disparities. While many studies have discussed the impact of the transportation system on individual factors from health, a very limited number of studies have focused on the impact of multiple factors associated with multiple morbidity and mortality forms. The focus of …

Smart Connector Helmet & Automatic Gps Inovasi Alat Bantu Komunikasi Antar Pengemudi Dan Penunjuk Arah Berbasis Internet, Nur Hasanah

Elinvo (Electronics, Informatics, and Vocational Education)

Perancangan smart connector helm dan automatic GPS bertujuan untuk membantu komunikasi antar pengemudi dan sebagai penunjuk arah yang berbasis internet. Alat bantu komunikasi ini terpasang di helm dan terkoneksi dengan smartphone. User dapat berkomunikasi antar Helm dengan Helm yang lain melalui jaringan wireless sinyal radio dari HT. Helm juga terhubung pada smartphone menggunakan bluetooth. Smartphone berfungsi sebagai penunjuk arah dengan adanya GPS dan aplikasi pendukung yang dibuat. Selain itu, pengemudi juga dapat menerima telfon dan mendengarkan musik dengan helm tanpa harus memegang smartphone. Metode perancangan menggunakan pendekatan water fall. Hasil rancangan diperoleh: (a) kerangka Helm yang …

Single Propeller Drone (Singrone): Inovasi Rancang Bangun Drone Single Propeller Sebagai Wahana Pemetaan Lahan Berbasis Unmaned Aerial Vehicle (Uav), Mohammad Giffari Anta Pradana

Elinvo (Electronics, Informatics, and Vocational Education)

Dewasa ini, teknologi sebagai faktor memberikan kontribusi yang signifikan dalam peningkatan
kualitas hidup manusia. Salah satu teknologi yang berkembang saat ini adalah drone. Drone adalah
pesawat tanpa awak yang dikendalikan dengan sebuah remote control , di lengkapi dengan GPS sebagai
navigasi, dan lock position. Pada umumnya drone digunakan untuk berbagai hal, seperti pemantauan lalu
lintas, pemetaan lahan, investigasi dan sebagainya. Namun penggunaan drone dengan menggunakan
banyak propeller merupakan salah satu masalah penggunaan drone. Semakin banyak propeller yang
digunakan, maka masa hidup drone di udara juga akan semakin berkurang. Hal ini diarenakan baterai
yang digunakan oleh wahana tersebut banyak digunakan untuk …

Sistem Monitoring Pencemaran Polutan Kendaraan Via Gadget Berbasis Arduino, Adibatul Ardianto

Elinvo (Electronics, Informatics, and Vocational Education)

Sumber polusi udara salah satunya adalah gas buang kendaraan bermotor, gas yang dihasilkan dari pembakaran bahan bakar terjadi pada mesin kendaraan. Tingkat deteksi aplikasi dari sistem pembuangan kendaraan bermotor yang dibuat digunakan untuk mendeteksi jumlah kadar gas H_2, gas EtOH dan gas CO dengan menggunakan sensor TGS2201. Data dari sensor diolah oleh arduino dan hasilnya ditampilkan pada PC melalui port serial, desain program aplikasi dengan menggunakan Bahasa C.

Rancang Bangun Pengukur Laju Detak Jantung Berbasis Plc Mikro, Dena Anugrah

Elinvo (Electronics, Informatics, and Vocational Education)

Artikel ini bertujuan untuk melakukan rancang bangun pengukur laju detak jantung yang terdiri dari perangkat keras dan perangkat lunak. Kalibrasi dilakukan dengan menggunakan alat medis Automatic Blood Pressure Monitor. Alat yang dirancang dibuat menggunakan PLC mikro yang diprogram dengan perangkat lunak LDmicro. Teknologi optik LED inframerah dan fotodioda digunakan untuk mendeteksi aliran darah di dalam kulit jari. Dari hasil pengukuran didapat bahwa alat ini memiliki tingkat kesalahan 0,198%. Nilai ini masih di bawah nilai kesalahan yang masih bisa ditolelir yakni sebesar 0,6745%. Jadi dapat disimpulkan bahwa alat yang dirancang dapat digunakan untuk mengukur laju detak jantung dengan akurasi yang sesuai …