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Articles 38791 - 38820 of 196358

Full-Text Articles in Engineering

Efficient Routing Protocols For Cognitive Radio Networks Of Energy-Constrained Devices And Dissimilar Delay-Sensitive Levels, Rita Ahmad Abu Diab Apr 2022

Efficient Routing Protocols For Cognitive Radio Networks Of Energy-Constrained Devices And Dissimilar Delay-Sensitive Levels, Rita Ahmad Abu Diab

Dissertations

As the Cognitive Radio (CR) overwhelms spectrum deficiency, it offers a substantial communication environment to accommodate IoT devices demanding connectivity and prompt arrival of their sensed data. The perceived shortage in CR routing protocols concerning delay and energy consumption promotes the novel proposal of two multi-hop routing protocols; Efficient Routing protocol for Cognitive Radio (ERCR) networks and Efficient Hybrid Routing protocol for Cognitive Radio (EHRCR) networks. A proposal for a D/M/1/K queuing model adapted to be applied in a CR network (CRN) is investigated with a retrial service system over a single licensed channel. …

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Behavior Of Steel Fiber Reinforced Concrete Made With Recycled Concrete Aggregates: Material Characterization And Deep Beam Shear Response, Nancy Kachouh Apr 2022

Behavior Of Steel Fiber Reinforced Concrete Made With Recycled Concrete Aggregates: Material Characterization And Deep Beam Shear Response, Nancy Kachouh

Dissertations

This research aims to examine the performance of concrete made with recycled concrete aggregates (RCAs) and steel fibers. It comprises material characterization tests, large-scale reinforced concrete (RC) deep beam tests, and numerical modeling. Material characterization test parameters included the RCA replacement percentage (30, 70, and 100%) and the steel fiber volume fraction (vf = 1, 2, and 3%). Fourteen large-scale deep beam numerical models with and without web openings made with 100% RCAs and steel fibers were developed and validated through a comparative analysis with test results. A numerical parametric study was conducted to investigate the effect of varying …

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Pre-Training Graph Neural Networks For Link Prediction In Biomedical Networks, Yahui Long, Min Wu, Yong Liu, Yuan Fang, Chee Kong Kwoh, Jiawei Luo, Xiaoli Li Apr 2022

Pre-Training Graph Neural Networks For Link Prediction In Biomedical Networks, Yahui Long, Min Wu, Yong Liu, Yuan Fang, Chee Kong Kwoh, Jiawei Luo, Xiaoli Li

Research Collection School Of Computing and Information Systems

Motivation: Graphs or networks are widely utilized to model the interactions between different entities (e.g., proteins, drugs, etc) for biomedical applications. Predicting potential links in biomedical networks is important for understanding the pathological mechanisms of various complex human diseases, as well as screening compound targets for drug discovery. Graph neural networks (GNNs) have been designed for link prediction in various biomedical networks, which rely on the node features extracted from different data sources, e.g., sequence, structure and network data. However, it is challenging to effectively integrate these data sources and automatically extract features for different link prediction tasks. Results: In …

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Verifiable Searchable Encryption Framework Against Insider Keyword-Guessing Attack In Cloud Storage, Yinbin Miao, Robert H. Deng, Kim-Kwang Raymond Choo, Ximeng Liu, Hongwei Li Apr 2022

Verifiable Searchable Encryption Framework Against Insider Keyword-Guessing Attack In Cloud Storage, Yinbin Miao, Robert H. Deng, Kim-Kwang Raymond Choo, Ximeng Liu, Hongwei Li

Research Collection School Of Computing and Information Systems

Searchable encryption (SE) allows cloud tenants to retrieve encrypted data while preserving data confidentiality securely. Many SE solutions have been designed to improve efficiency and security, but most of them are still susceptible to insider Keyword-Guessing Attacks (KGA), which implies that the internal attackers can guess the candidate keywords successfully in an off-line manner. Also in existing SE solutions, a semi-honest-but-curious cloud server may deliver incorrect search results by performing only a fraction of retrieval operations honestly (e.g., to save storage space). To address these two challenging issues, we first construct the basic Verifiable SE Framework (VSEF), which can withstand …

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Bistability And Switching Behavior In Moving Animal Groups, Daniel Strömbom, Stephanie Nickerson, Catherine Futterman, Alyssa Difazio, Cameron Costello, Kolbjørn Tunstrøm Mar 2022

Bistability And Switching Behavior In Moving Animal Groups, Daniel Strömbom, Stephanie Nickerson, Catherine Futterman, Alyssa Difazio, Cameron Costello, Kolbjørn Tunstrøm

Northeast Journal of Complex Systems (NEJCS)

Moving animal groups such as schools of fish and flocks of birds frequently switch between different group structures. Standard models of collective motion have been used successfully to explain how stable groups form via local interactions between individuals, but they are typically unable to produce groups that exhibit spontaneous switching. We are only aware of one model, constructed for barred flagtail fish that are known to rely on alignment and attraction to organize their collective motion, that has been shown to generate this type of behavior in 2D (or 3D). Interestingly, another species of fish, golden shiners, do exhibit switching …

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Spydrnet - An Open-Source Python Netlist Representation For Analysis And Transformation, Dallin Mark Skouson Mar 2022

Spydrnet - An Open-Source Python Netlist Representation For Analysis And Transformation, Dallin Mark Skouson

Theses and Dissertations

SpyDrNet is an open-source structural netlist representation framework written in Python that allows users to create, analyze, and manipulate structural netlists. The internal format was designed to hold generic source structural netlists. Verilog and EDIF netlists generated by Vivado were read and written by SpyDrNet. Additional API functionality was built around the netlist representation. An application applying triple modular redundancy and duplication with compare was created and successfully used.

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Soft Magnetic Composite Substrates For Rf/Microwave Applications, Poonam Lathiya Mar 2022

Soft Magnetic Composite Substrates For Rf/Microwave Applications, Poonam Lathiya

USF Tampa Graduate Theses and Dissertations

Novel soft magnetic ferrite materials will play a crucial role in next-generation over one trillion sensors (also known as “trillion sensor economy) related to 5G communications and internet of things, as these materials can achieve improved wireless power and signal transfer efficiency with high operation frequency. In this work, Ni-Cu-Zn and Ni-Co-Zn ferrites with high permeability, high permittivity, and low magnetic and dielectric losses were prepared for RF and microwave device applications. Frequency dispersion of RF complex permeability of Ni-Cu-Zn ferrites prepared under different applied hydraulic pressures and durations have been thoroughly investigated. The Ni0.35Cu0.19Zn0.46Fe2O4 ferrites were prepared by conventional …

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Finding Signal In The Noise: High-Fidelity, Quantitative, Optical Blood Perfusion Imaging With Interference, Abdul Mohaimen Safi Mar 2022

Finding Signal In The Noise: High-Fidelity, Quantitative, Optical Blood Perfusion Imaging With Interference, Abdul Mohaimen Safi

USF Tampa Graduate Theses and Dissertations

For label-free, non-invasive, wide field-of-view (FOV) imaging/monitoring of blood flow, speckle-based approaches are gaining popularity. However, to obtain quantitative flow information, speckle techniques rely on the multi-exposure scheme which requires complex, bulky, and expensive instrumentation, limiting its application to preclinical studies. This dissertation directly addresses these issues. In the first part of this dissertation, we report a novel single shot synthetic multi-exposure speckle imaging (syMESI) method to synthetically produce multi-exposure images from one short single exposure speckle image using spatial binning/averaging. We demonstrate that syMESI can reimagine conventional hardware based MESI, with low-cost single exposure laser speckle imaging (LSCI) instrumentation. …

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Tuning Between Quenching And Energy Transfer In Dna-Templated Heterodimer Aggregates, Azhad U. Chowdhury, Jonathan S. Huff, Matthew S. Barclay, Lance K. Patten, Aaron Sup, Natalya Hallstrom, Jeunghoon Lee, Paul H. Davis, Daniel B. Turner, Bernard Yurke, William B. Knowlton, Ryan D. Pensack Mar 2022

Tuning Between Quenching And Energy Transfer In Dna-Templated Heterodimer Aggregates, Azhad U. Chowdhury, Jonathan S. Huff, Matthew S. Barclay, Lance K. Patten, Aaron Sup, Natalya Hallstrom, Jeunghoon Lee, Paul H. Davis, Daniel B. Turner, Bernard Yurke, William B. Knowlton, Ryan D. Pensack

Materials Science and Engineering Faculty Publications and Presentations

Molecular excitons, which propagate spatially via electronic energy transfer, are central to numerous applications including light harvesting, organic optoelectronics, and nanoscale computing; they may also benefit applications such as photothermal therapy and photoacoustic imaging through the local generation of heat via rapid excited-state quenching. Here we show how to tune between energy transfer and quenching for heterodimers of the same pair of cyanine dyes by altering their spatial configuration on a DNA template. We assemble “transverse” and “adjacent” heterodimers of Cy5 and Cy5.5 using DNA Holliday junctions. We find that the transverse heterodimers exhibit optical properties consistent with excitonically interacting …

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Ultra-Broadband And Polarization-Insensitive Metasurface Absorber With Behavior Prediction Using Machine Learning, Shobhit K. Patel, Juveriya Parmar, Vijay Katkar, Fahad Ahmed Al-Zahrani, Kawsar Ahmed Mar 2022

Ultra-Broadband And Polarization-Insensitive Metasurface Absorber With Behavior Prediction Using Machine Learning, Shobhit K. Patel, Juveriya Parmar, Vijay Katkar, Fahad Ahmed Al-Zahrani, Kawsar Ahmed

Department of Mechanical and Materials Engineering: Faculty Publications

The solar spectrum energy absorption is very important for designing any solar absorber. The need for absorbing visible, infrared, and ultraviolet regions is increasing as most of the absorbers absorb visible regions. We propose a metasurface solar absorber based on Ge2Sb2Te5 (GST) substrate which increases the absorption in visible, infrared and ultraviolet regions. GST is a phase-changing material having two different phases amorphous (aGST) and crystalline (cGST). The absorber is also analyzed using machine learning algorithm to predict the absorption values for different wavelengths. The solar absorber is showing an ultra-broadband response covering a 0.2–1.5 …

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Effects Of Annealing Ambient On The Structural, Optical And Electrical Properties Of Tio2:Ge Thin Films, Lilian A. Owino, Sebastian Waita, Robinson J. Musembi, Francis W Nyongesa Mar 2022

Effects Of Annealing Ambient On The Structural, Optical And Electrical Properties Of Tio2:Ge Thin Films, Lilian A. Owino, Sebastian Waita, Robinson J. Musembi, Francis W Nyongesa

Tanzania Journal of Science

TiO2, a semiconducting material with a wide energy band gap, has been researched intensively due to its interesting properties and many potential applications. The films properties can as well be modified by preparing the films under diverse ambient to suit diverse applications. In this work, the effects of the annealing atmosphere on the structural, optical and electrical properties of pure TiO2 and TiO2:Ge composite thin films deposited by sputtering from commercially available pure TiO2 and TiO2:Ge (85:15) targets respectively were studied. The films were deposited on fluorine doped tin oxide glass substrates by radio frequency magnetron sputtering technique at room …

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Volume Introduction, I. Glenn Cohen, Timo Minssen, W. Nicholson Price Ii, Christopher Robertson, Carmel Shachar Mar 2022

Volume Introduction, I. Glenn Cohen, Timo Minssen, W. Nicholson Price Ii, Christopher Robertson, Carmel Shachar

Other Publications

Medical devices have historically been less regulated than their drug and biologic counterparts. A benefit of this less demanding regulatory regime is facilitating innovation by making new devices available to consumers in a timely fashion. Nevertheless, there is increasing concern that this approach raises serious public health and safety concerns. The Institute of Medicine in 2011 published a critique of the American pathway allowing moderate-risk devices to be brought to the market through the less-rigorous 501(k) pathway,1 flagging a need for increased postmarket review and surveillance. High-profile recalls of medical devices, such as vaginal mesh products, along with reports globally …

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High-Risk Traffic Crash Pattern Recognition And Identification Using Econometric Models And Machine Learning Models, Runan Yang Mar 2022

High-Risk Traffic Crash Pattern Recognition And Identification Using Econometric Models And Machine Learning Models, Runan Yang

USF Tampa Graduate Theses and Dissertations

Roadway crashes have become a major cause of human deaths and injuries and caused much economic damage. According to World Health Organization (WHO), about 1.35 million people died in traffic crashes and over 50 million people injured from traffic crashes in the year of 2016 (World Health Organization, 2020). Nationally, in the U.S., the latest decade witnessed an increase of over 10% in traffic fatalities (National Highway Traffic Safety Administration (NHTSA), 2019). Similarly, in state of Florida, the fatal crashes increased by 4.62% from 2019 to 2020 (Florida Department of Highway Safety and Motor Vehicles, 2021). To prevent injuries and …

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Thermochemical Conversion Of Lipid-Extracted Algal Biomass To Value-Added Sustainable Products, Magdalini Tsarpali Mar 2022

Thermochemical Conversion Of Lipid-Extracted Algal Biomass To Value-Added Sustainable Products, Magdalini Tsarpali

USF Tampa Graduate Theses and Dissertations

The extensive use of fossil fuels has increased the CO2 emissions, a phenomenon that has increased the demand for renewable energy and resources. Algae, photosynthetic aquatic organisms, have recently caught attention due to their high growth rate and the high CO2 capture ability. Biofuels and bioproducts from algae are considered promising alternatives because of their lower carbon footprint. Lipids are by far the most popular algal product, as they find applications in both fuels, such as biodiesel, and products, such as nutraceuticals and cosmetics. However, after lipid extraction, conversion of the residual algal biomass to value-added products is viewed as …

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Coal Fines Migration: A Holistic Review Of Influencing Factors, Faisal Ur Rahman Awan, Muhammad Arif, Stefan Iglauer, Alireza Keshavarz Mar 2022

Coal Fines Migration: A Holistic Review Of Influencing Factors, Faisal Ur Rahman Awan, Muhammad Arif, Stefan Iglauer, Alireza Keshavarz

Research outputs 2022 to 2026

Coal fines can substantially influence coal seam gas reservoir permeability, thus impeding the flow of gas in coal microstructure. The coal fines generation and migration are influenced by several factors, wherein coal fines are generally hydrophobic and aggregate in natural coal seam gas (CSG) under prevailing conditions of pH, salinity, temperature and pressure. This aggregation behaviour can damage the coal matrix and cleat system permeabilities, leading to a considerable reduction of proppant pack conductivity (i.e. fracture conductivity). Several datasets have been reported within the literature on this subject in the last decade. However, a more up-to-date discussion of this area …

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Application Of Machine Learning To Predict The Performance Of An Emipg Reactor Using Data From Numerical Simulations, Owen Sedej, Eric G. Mbonimpa, Trevor Sleight, Jeremy Slagley Mar 2022

Application Of Machine Learning To Predict The Performance Of An Emipg Reactor Using Data From Numerical Simulations, Owen Sedej, Eric G. Mbonimpa, Trevor Sleight, Jeremy Slagley

Faculty Publications

Microwave-driven plasma gasification technology has the potential to produce clean energy from municipal and industrial solid wastes. It can generate temperatures above 2000 K (as high as 30,000 K) in a reactor, leading to complete combustion and reduction of toxic byproducts. Characterizing complex processes inside such a system is however challenging. In previous studies, simulations using computational fluid dynamics (CFD) produced reproducible results, but the simulations are tedious and involve assumptions. In this study, we propose machine-learning models that can be used in tandem with CFD, to accelerate high-fidelity fluid simulation, improve turbulence modeling, and enhance reduced-order models. A two-dimensional …

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The Framework For Evaluating Children’S Wellbeing As Related To Their Active School Traveling (Ast), Marwa Charkas Mar 2022

The Framework For Evaluating Children’S Wellbeing As Related To Their Active School Traveling (Ast), Marwa Charkas

Architecture and Planning Journal (APJ)

Investigating wellbeing-related concerns nowadays is greater than ever. This extends to all aspects of human beings’ daily life. In this context, children’s wellbeing is having an increasing interest as they are the core constituents of tomorrow’s world. Studies have affirmed the vital role of children’s physical activities as catalysts for all domains of their wellbeing. Active school traveling is one of these daily activities practiced by children frequently. The way it is practiced, and its interrelated activities are profoundly affecting children’s feeling and accordingly their well-being. However, the paper builds an argument about conceptualizing an applicable understanding of wellbeing. Reviewing …

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The Impact Of Plastering On The Hygrothermal Behaviour Of Historical Sandstone Located In The Coastal Region Of Lebanon, Hoda Zeayter, Ibtihal Y. El-Bastawissi, Hiba Mohsen Mar 2022

The Impact Of Plastering On The Hygrothermal Behaviour Of Historical Sandstone Located In The Coastal Region Of Lebanon, Hoda Zeayter, Ibtihal Y. El-Bastawissi, Hiba Mohsen

Architecture and Planning Journal (APJ)

In an unusual trend in the conservation practice of built heritage in Lebanon, the external plaster layer, which protects the sandstone from weathering factors, is being removed for aesthetic reasons. These buildings are in a coastal region, hot humid climate in the summer and moderate cold weather in the winter. This paper discusses the importance of external and internal plastering of the historical sandstone bearing wall, by the mean of a computational tool that underlines the role of the plastering in the hygrothermal behaviour of the historical stone, in the aim to validate the practice of the ancestors in covering …

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Cycling Safety Problems In Urban Context, Boushra Naim, Mary Felix Mar 2022

Cycling Safety Problems In Urban Context, Boushra Naim, Mary Felix

Architecture and Planning Journal (APJ)

Cycling as an urban peculiarity has been well-informed as far as quantifiable area plan characteristics like road lattices, cycle paths, misfortunes; in any case, there is less exploration that objectives the security issues in metropolitan climate. This review portrays the consequences of subjective examination led with bikers and other street users. This phase of exploration has been dominatingly 'descriptive', determined to give a guide of the scope of security related inspirations, perspectives, insights, and conduct among cyclists and other street users. Cycling meets with a scope of strategy issues, going from street wellbeing to difficulties and failures. The outcomes in …

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Assessing Photogrammetry Artificial Intelligence In Monumental Buildings’ Crack Digital Detection, Said Maroun, Mostafa Khalifa, Nabil Mohareb Mar 2022

Assessing Photogrammetry Artificial Intelligence In Monumental Buildings’ Crack Digital Detection, Said Maroun, Mostafa Khalifa, Nabil Mohareb

Architecture and Planning Journal (APJ)

Natural and human-made disasters have significant impacts on monumental buildings, threatening them from being deteriorated. If no rapid consolidations took into consideration traumatic accidents would endanger the existence of precious sites. In this context, Beirut's enormous 4th of August 2020 explosion damaged an estimated 640 historical monuments, many volunteers assess damages for more than a year to prevent the more crucial risk of demolitions. This research aims to assist the collaboration ability among photogrammetry science, Artificial Intelligence Model (AIM) and Architectural Coding to optimize the process for better coverage and scientific approach of data specific to the crack disorders to …

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Designing Flexible Open Spaces With Energy Efficient Solutions For A Resilient Beirut - Case Study Of Rmeil Medawar District, Nehmat Karim Mar 2022

Designing Flexible Open Spaces With Energy Efficient Solutions For A Resilient Beirut - Case Study Of Rmeil Medawar District, Nehmat Karim

Architecture and Planning Journal (APJ)

A news supplement produced by UNDP “Peace Building in Lebanon”, distributed along with An-Nahar newspaper had published in its December 2020 issue an article entitled “Urban Vacant Parcels as Opportunities to Reclaim Public Spaces in Times of Crises and Austerity” highlighting on the following: While Lebanon experiences a multiple crises and people are struggling more every day, solidarities are urgently needed and spaces where people can meet and connect would play a key role in this matter. Adding that Beirut, the capital, is considered a dense and rapidly urbanizing city, where shared spaces are scant, poorly designed, and ill managed. …

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Applying Metamorphosis Philosophy To Revive The Abandoned Buildings, Fatima Ghosn, Ayman Afify, Hiba Mohsen, Maged Youssef Mar 2022

Applying Metamorphosis Philosophy To Revive The Abandoned Buildings, Fatima Ghosn, Ayman Afify, Hiba Mohsen, Maged Youssef

Architecture and Planning Journal (APJ)

The metamorphosis philosophy is related to architecture, for instance this translation is showcased in the transformation of spaces in buildings that is either done by the destruction or modification of the architectural product. Unfortunately, many buildings, structures and spaces are left abandoned because of changing situations, war, or natural causes. These abandoned buildings can increase the crime rate and leave lands covered in leftover spaces which can have drastic consequences on the environment. Therefore, the aim of this paper is to propose a set of design approaches that can apply the philosophy of metamorphosis in the revival of abandoned buildings …

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High-Octane Gasoline Production Processes Using Catalysts Containing Platinum, Dilnoza Mauletbayevna Ametova, Duysenbay Xojabayevich Abdikamalov, Edil Abilov Mar 2022

High-Octane Gasoline Production Processes Using Catalysts Containing Platinum, Dilnoza Mauletbayevna Ametova, Duysenbay Xojabayevich Abdikamalov, Edil Abilov

Karakalpak Scientific Journal

The catalytic reforming process is designed to increase the detonation resistance of gasolines and to obtain individual aromatic hydrocarbons, mainly benzene, toluene, xylenes - petrochemical feedstocks. It is important to obtain a cheap hydrogen-containing gas in the process for use in other hydrocatalytic processes. The importance of catalytic reforming processes in oil refining increased significantly in the 1990s. due to the need to produce unleaded high-octane gasoline

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Rapid On Site Repair Of Wind Turbines By Cold Spray, Behrad Koohbor, Francis M. Haas, Joseph F. Stanzione Iii Mar 2022

Rapid On Site Repair Of Wind Turbines By Cold Spray, Behrad Koohbor, Francis M. Haas, Joseph F. Stanzione Iii

Henry M. Rowan College of Engineering Departmental Research

No abstract provided.

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Non-Contact Condition Monitoring Of Wind Turbines Using Laser Vibrometers, Chen Shen, Ratneshwar Jha, Nand K. Singh Mar 2022

Non-Contact Condition Monitoring Of Wind Turbines Using Laser Vibrometers, Chen Shen, Ratneshwar Jha, Nand K. Singh

Henry M. Rowan College of Engineering Departmental Research

No abstract provided.

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Entity-Driven Fact-Aware Abstractive Summarization Of Biomedical Literature, Amanuel Alambo, Tanvi Banerjee, Krishnaprasad Thirunarayan, Michael Raymer Mar 2022

Entity-Driven Fact-Aware Abstractive Summarization Of Biomedical Literature, Amanuel Alambo, Tanvi Banerjee, Krishnaprasad Thirunarayan, Michael Raymer

Computer Science and Engineering Faculty Publications

As part of the large number of scientific articles being published every year, the publication rate of biomedical literature has been increasing. Consequently, there has been considerable effort to harness and summarize the massive amount of biomedical research articles. While transformer-based encoder-decoder models in a vanilla source document-to-summary setting have been extensively studied for abstractive summarization in different domains, their major limitations continue to be entity hallucination (a phenomenon where generated summaries constitute entities not related to or present in source article(s)) and factual inconsistency. This problem is exacerbated in a biomedical setting where named entities and their semantics (which …

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On The Reliability Of Wearable Sensors For Assessing Movement Disorder-Related Gait Quality And Imbalance: A Case Study Of Multiple Sclerosis, Steven Díaz Hernández Mar 2022

On The Reliability Of Wearable Sensors For Assessing Movement Disorder-Related Gait Quality And Imbalance: A Case Study Of Multiple Sclerosis, Steven Díaz Hernández

USF Tampa Graduate Theses and Dissertations

Approximately 33 million American adults had a movement disorder associated with medication use, ear infections, injury, or neurological disorders in 2008, with over 18 million people affected by neurological disorders worldwide. Physical therapists assist people with movement disorders by providing interventions to reduce pain, improve mobility, avoid surgeries, and prevent falls and secondary complications of neurodegenerative disorders. Current gait assessments used by physical therapists, such as the Multiple Sclerosis Walking Scale, provide only semi-quantitative data, and cannot assess walking quality in detail or describe how one’s walking quality changes over time. As a result, quantitative systems have grownas useful tools …

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Synthesis Of Thiol-Acrylate Hydrogels For 3d Cell Culture And Microfluidic Applications, Anowar Hossain Khan Mar 2022

Synthesis Of Thiol-Acrylate Hydrogels For 3d Cell Culture And Microfluidic Applications, Anowar Hossain Khan

LSU Doctoral Dissertations

Globally cell culture is an $18.98 billion industry as of 2020, with an 11.6 percent annual growth rate. Drug discovery has an estimated worth of $69.8 billion in 2020 and is predicted to grow to $110.4 billion by 2025. Three-dimensional (3D) cell culture of cancer cells is one of the rapidly growing felids since it better recapitulates in vivo conditions compared to two-dimensional (2D) models. However, it is challenging to grow 3D tumor spheroids outside the body, and some of the existing technology can generate these spheroids outside the human body but poorly mimic in vivo tumor models. Therefore, there …

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U-Splines: Splines Over Unstructured Meshes, Steven K. Schmidt Mar 2022

U-Splines: Splines Over Unstructured Meshes, Steven K. Schmidt

Theses and Dissertations

U-splines are a novel approach to the construction of a spline basis for representing smooth objects in Computer-Aided Design (CAD) and Computer-Aided Engineering (CAE). A spline is a piecewise-defined function that satisfies continuity constraints between adjacent cells in a mesh. U-splines differ from existing spline constructions, such as Non-Uniform Rational B-splines (NURBS), subdivision surfaces, T-splines, and hierarchical B-splines, in that they can accommodate local variation in cell size, polynomial degree, and smoothness simultaneously over more varied mesh configurations. Mixed cell types (e.g., triangle and tetrahedron and quadrilateral and hexahedral cells in the same mesh) and T-junctions are also supported. The …

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Evaluating The Low-Temperature Properties Of Asphalt Binders Extracted From Mixtures Containing Recycled Materials, Eslam Deef-Allah, Magdy Abdelrahman Mar 2022

Evaluating The Low-Temperature Properties Of Asphalt Binders Extracted From Mixtures Containing Recycled Materials, Eslam Deef-Allah, Magdy Abdelrahman

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The use of recycled materials − such as reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) − in asphalt mixtures reduces natural resources demands and decreases materials dumped in landfills. The aged binders included in the recycled materials alter binders' low-temperature properties included in asphalt mixtures. Therefore, asphalt binders were extracted from asphalt mixtures collected from the field as cores. Due to the limited amount of extracted asphalt binders (EABs), a dynamic shear rheometer was used to examine the low-temperature properties [e.g., true temperature (Tt), continuous temperature (Tc), and delta continuous temperature (ΔTc)]. Using recycled materials in asphalt mixtures …

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