Engineering Commons^™

On-Machine Cutting Tool Wear Monitoring Technique Based On Edge Diffraction Theory, Chabum Lee, Seongkyul Jeon

Early Career Technical Journal (ECTJ)

Section 3: Materials; pp. 65-69

Determination Of Mechanical Properties For Type 1 Portland Cement Paste With Glass Microspheres As An Inert Filler, Zachary J. Wallace, Damian L. Stoddard, Matt Nelms, Wayne Hodo, A M. Rajendram

Early Career Technical Journal (ECTJ)

Section 3: Materials; pp. 70-74

Dynamic And Damping Properties Of Wood - Based Composite Using The Cantilever Beam Vibration Technique, Maharshi Dave, Tejas Pandya, Damian Stoddard

Early Career Technical Journal (ECTJ)

Section 3: Materials; pp. 75-81

Novel Surface Roughness Measurement Technique Using Capacitance Effect, Soomin Choi, Chabum Lee

Early Career Technical Journal (ECTJ)

Section 3: Materials; pp. 82-84

Numerical Investigation Of Shock Wave Propoagtion In Biomineralized Fish Scale, Matthew Nelms, Wayne Hodo, A M. Rajendran

Early Career Technical Journal (ECTJ)

Section 3: Materials; pp. 90-94

Hierarchical Grouping In Particle Swarm Optimization – Hgpso, Sanjay Sarma O V, Ramana M. Pidaparti, Ankita Joshi

Early Career Technical Journal (ECTJ)

Section 4: Materials; pp. 97-103

Applications Of Lidar In Autonomous Vehicles, Allen J. Stewart, Jonathan Burden, Kevin Mcfall

Early Career Technical Journal (ECTJ)

Section 5: Miscelleneous; pp. 131-133

Minimum Storage Space Modeling By Maximum Independent Set For Antenna Systems, Serkan Guldal, Murat M. Tanik, Ibrahim Bilgin

Early Career Technical Journal (ECTJ)

Section 5: Miscelleneous; pp. 134-139

Dynamic Response Of Wood Based Bio-Composities Under High-Strain Rate Compressive Loading, Aarsh Shah, Tejas S. Pandya, Damian Stoddard, Suman Babu Ukyam, James Wooten, Jason Street

Early Career Technical Journal (ECTJ)

Section 3: Materials; pp. 85-89

Gesture Recognition Using Ultrasonic Sensors And An Rgb Camera, Minchul Shin, Stephen Zeigler

Early Career Technical Journal (ECTJ)

Section 5: Miscelleneous; pp. 147-151

Comparison Of Stop Sign Distance Detection Using 2d And 3d Cameras, Mahbubul Islam, Kevin Mcfall

Early Career Technical Journal (ECTJ)

Section 5: Miscelleneous; pp. 127-130

A Mesoscale-Based Homogenization Study Of Sand Using The Discrete Element Method, Gerald Pekmezi, David Littlefield

Early Career Technical Journal (ECTJ)

Section 4: Materials; pp. 104-111

Calculation Of Effective Thermal Conductivity Of Powder Bed Systems Using Smoothed Particle Hydrodynamics Method, Deepak Shah, Alexey N. Volkov

Early Career Technical Journal (ECTJ)

Section 6: Thermal Sciences; pp. 155-159

Heat Transfer Modelling And Bandwidth Determination Of Sma Actuators For Robotics Applications, Tyler Ross Lambert, Austin Gurley, David G. Beale

Early Career Technical Journal (ECTJ)

Section 5: Miscelleneous; pp.140-146

Porous Fe Layered Alumina Channel For Chemical Looping Combustion Micro-Reactors, Bodiuzzaman Jony, Rajagopalan Varadarajan Ranganathan, Mruthunjaya Uddi

Early Career Technical Journal (ECTJ)

Section 6: Thermal Sciences; pp. 168-174

An Improved Contact Algorithm For Multi-Material Arbitrary Lagrangian-Eulerian Hydrocodes In Three-Dimensions, Kenneth C. Walls, David L. Littlefield

Early Career Technical Journal (ECTJ)

Section 4: Materials; pp. 117-124

Kinetic And Hydrodynamic Simulations Of Laser-Induced Plume Expansion, Omid Azadeh Ranjbar, Alexey N. Volkov

Early Career Technical Journal (ECTJ)

Section 6: Thermal Sciences; pp. 160-167

A Prediction Method For Overall Economic Value Of Fault Detection And Diagnostic Tools For Rooftop And Split Systems, David Yuill, James Braun

Durham School of Architectural Engineering and Construction: Faculty Publications

Fault detection and diagnostics (FDD) tools for air-conditioning application may perform well or poorly, but it is difficult to characterize this performance in a meaningful way. Some recently proposed evaluation techniques have provided various statistics to characterize FDD performance, but these results can be difficult for a potential adopter of FDD to understand. A new method of characterizing FDD performance by predicting the overall economic value of the FDD tool is proposed in this paper. It is applicable to FDD tools intended for air-cooled unitary airconditioners, such as rooftop units (RTU) and split systems. The method gives an estimated dollar …

Integrated Geophysical Approach Using Electrical Resistivity Tomography And Multichannel Analysis Of Surface Wave In Assessing Wilson Spring Development, Ibrahim E. Ahmed

Doctoral Dissertations

"This research investigated fractured zones leading to preferential flow paths of Wilson Spring. In this context, electrical resistivity tomography (ERT) data and multi-channel analyses of surface waves (MASW) data were acquired at studied site with the purpose of mapping a variable depth to top of bedrock and geological structures.

Interpretation of the boreholes, MASW, and ERT data indicated that a depth to top of rock does vary significantly at the studied site due to many solution-widened fractures. Multiple near-vertical solution-widened fractures were mapped in the studied site based on the interpretation of the ERT data. The mapped solution-widened fractures appear …

Cable Shovel Dipper Stress And Fatigue Failure Modeling In Formation Excavation Engineering, Muhammad Azeem Raza

Doctoral Dissertations

"Large capacity shovels are used to achieve economic bulk production in surface mining operations. The suspended payload combined with dipper weight and formation resistive forces results in severe stress loading of the shovel front-end assembly. Material flaws, high stresses and harsh excavation conditions can initiate cracks in the dipper-teeth assembly. High stresses can cause these cracks to propagate to critical lengths resulting in fatigue failure, unscheduled downtimes, costly unplanned repairs, and downstream processing circuit problems. The literature reveals that dipper-related problems significantly reduce shovel up-time. This research is a pioneering effort towards developing a solid frame work for stress profiling, …

Advancing Microalgae Culturing Via Bubble Dynamics, Mass Transfer, And Dynamic Growth Investigations, Aastha Ojha

Doctoral Dissertations

"The major hindrances to large scale cultivation of microalgae are the problems associated with the design, operation, and scale-up of airlift photobioreactors (PBRs), due to a lack of a comprehensive understanding of the gas-liquid interaction process in real microalgae cultures. Thus, the overall objective of this work is to advance the fundamental understanding of microalgae culturing via gas holdup, bubble dynamics, mass transfer, and dynamic growth investigations.

First, a four-point optical fiber probe technique was employed to study the local gas holdup, and bubble dynamics properties such as bubble passage frequency, chord length and bubble velocity distribution, and interfacial area …

Development Of Implants Composed Of Bioactive Materials For Bone Repair, Wei Xiao

Doctoral Dissertations

"The purpose of this Ph.D. research was to address the clinical need for synthetic bioactive materials to heal defects in non-loaded and loaded bone. Hollow hydroxyapatite (HA) microspheres created in a previous study were evaluated as a carrier for controlled release of bone morphogenetic protein-2 (BMP2) in bone regeneration. New bone formation in rat calvarial defects implanted with BMP2-loaded microspheres (43%) was significantly higher than microspheres without BMP2 (17%) at 6 weeks postimplantation. Then hollow HA microspheres with a carbonate-substituted composition were prepared to improve their resorption rate. Hollow HA microspheres with ~12 wt. % of carbonate showed significantly higher …

Wetting Kinetics In Forced Spreading, Amer Mohammad Al-Shareef

Doctoral Dissertations

"Under dynamic conditions, the dynamic contact angle (the angle that the liquid makes with the solid) of a liquid on a solid surface varies dramatically with substrate velocity from its equilibrium value. Experimental data of the dynamic contact angles for polydimethylsiloxane (PDMS or silicone oil) under air on a glass substrate coated with teflon, for water under PDMS, for solutions of the polymer polyethylene oxide (PEO) under air, for solutions of PEO under PDMS, were obtained to simulate and understand the systems of brine or brine containing a polymer displacing viscous crude. A variety of solid substrates were used other …

Material Properties Characterization For Multilayer Pcb And Peec Macromodels For Above Plane Decoupling Capacitors, Xiang Fang

Masters Theses

"Accurate frequency-dependent dielectric properties are important for accurate modelling of signal and power integrity problems. And decoupling capacitors perform an important function in the impedance reduction of power distribution systems. Hence, precise dielectric properties and micromodels for decoupling capacitors are the key parts for the signal and power integrity design.

In Section 1, the existing method for extracting dielectric properties from fabricated multilayer printed circuit boards based on the measured electrical property of fabricated transmission lines is introduced and validated using simulations. And the potential errors in the procedure are discussed. After that Djordjevic-Sarkar causal dielectric model for dielectric properties …

A Comprehensive Study Of Lost Circulation With Application In The South Rumaila Field, Iraq, Abo Taleb Tuama Al-Hameedi

Masters Theses

“Drilling mud losses and problems associated with lost circulation while drilling account for a major expense in drilling oil and gas wells. By industry estimates, more than 2 billion USD is spent annually to combat and mitigate this problem (Ali et al., 2015).

The South Rumaila field in Iraq is one of the largest oilfields in the world. Wells drilled in this field are highly susceptible to lost circulation problems when drilling through the Dammam, Hartha and Shuaiba formations. Lost circulation events range from seepage losses to complete loss of the borehole and are a critical issue in field development. …

Oxidative Dehydrogenation Of Light Alkanes With Carbon Dioxide, Marktus A. Atanga

Masters Theses

”Most experts studying the global ecosystem and climate suggest that rising anthropogenic CO₂ emissions have contributed to significant global climate change in the last half-century. The development of effective strategies that convert CO₂ into energy, fuels, and chemicals are greatly preferable to oceanic or geologic sequestration options because they offer the potential to create new commercially-viable products from renewable carbon feedstock. On the other hand, the selective oxidative dehydrogenation of light alkanes (C₂-C₄) to corresponding olefins, methane reforming, and methane coupling are the major challenges for producing valuable and versatile feedstocks. The oxidative dehydrogenation …

Thresholding Techniques For Discrimination Of Seborrheic Keratosis From Melanoma In Dermoscopy Images, Pramada Kishtagari

Masters Theses

“Malignant melanoma is a very deadly form of skin cancer which has claimed many lives over the past few years. If detected early this can be cured, hence early detection of malignant melanoma is essential. Unfortunately melanoma is mimicked by seborrheic keratosis, a benign skin cancer. Identifying malignant melanoma as seborrheic keratosis using clinical diagnosis can prove fatal to the patient. To prevent such errors, dermoscopy, a common non-invasive skin imaging technique, is used which improves the diagnosis of these pigmented lesions by visualizing the morphological structures. This study proposes an automatic method by applying image processing techniques to aid …

Evaluation Of Highly Viscous Polymeric Fluids And Recrosslinked Degraded Gel, Danlu Zhang

Masters Theses

”This work presents the evaluations of two products. One can be used for hydraulic fracturing to achieve viscosity stable under high shear rate, and the other is potential to be applied to enhance oil recovery from mature oilfield.

The first experiment is to synthesize and evaluate a new polymeric fracturing fluid that can resist high shear rate of 511^-1 with favorable viscosity. Zirconium crosslinked fracturing fluids are lack of self-healing ability after shearing, and the difficulties still exist in maintaining viscous with lower polymer content exposed to high shearing conditions, therefore, the research is trying to develop a new …

Phase Field Modeling Of Electrodeposition Process In Lithium Metal Batteries, Nihal Acharya

Masters Theses

"One of the main weaknesses in long term performance of conventional lithium batteries is the growth of lithium microstructures on the electrode surface due to an electrochemical process, which can eventually lead to failure of these batteries. Suppressing this microstructure growth is a key in developing new generations of lithium metal batteries (LMBs). In this study, a two-dimensional (2D) phase field model is constructed to understand and determine the parameters controlling formation and evolution of microstructures in LMBs. A Ginzburg-Landau free energy functional, which is a function of concentration of Li⁺ and applied voltage, and a system consisting of …

Aspen Simulation Of Oil Shale And Biomass Process, Anand Alembath

Masters Theses

"This thesis focuses on design and analysis of two major chemical processes using computer simulation which performs a steady state computation. The objective is to design processes using Aspen simulation to establish optimum operating conditions by performing various simulation runs which are challenging to execute at lab scale.

Increasing energy needs and decline of global oil prices has shifted our focus on commercially developing unconventional and renewable resources. Commercialization of any process relies on developing a process model that identifies different process parameters by performing a steady state mass and heat balance. Aspen simulation is considered an effective process modeling …