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Articles 1 - 30 of 58
Full-Text Articles in Engineering
The Mathematical Relationship Among Normal Patellar Dimensions, To Find The Pre-Diseased Patellar Thickness In Different Populations, Mahdie Kerdari, Shima Rastegar, Yasmeen Mustafa, Mohammadreza Abbassian, Armin Aalami Harandi, Mary M. Stahle, Robert Hube, Hamid Rs Hosseinzadeh
The Mathematical Relationship Among Normal Patellar Dimensions, To Find The Pre-Diseased Patellar Thickness In Different Populations, Mahdie Kerdari, Shima Rastegar, Yasmeen Mustafa, Mohammadreza Abbassian, Armin Aalami Harandi, Mary M. Stahle, Robert Hube, Hamid Rs Hosseinzadeh
Henry M. Rowan College of Engineering Departmental Research
Whether resurfacing or not resurfacing the patella during total knee arthroplasty (TKA) still is a challenge to orthopedic surgeons. A significant reason for this controversy is the far from perfect outcomes of both techniques, resulting from inadequate knowledge of normal patellar dimensions in a diseased one. The primary purpose of the current study is to find the pre-diseased patellar dimensions and the ethnic differences in patellar dimensions. We measured the patella's dimensions on 927 normal young adult knee MRIs from seven different ethnicities. Besides comparing the dimensions between sexes, ages, and sides, we analyzed the differences among ethnic groups. The …
Exploring A Platinum Nanocatalytic Microcombustion-Thermoelectric Coupled Device, Dylan Moore Mcnally
Exploring A Platinum Nanocatalytic Microcombustion-Thermoelectric Coupled Device, Dylan Moore Mcnally
Theses and Dissertations
This work aimed to create a first-generation power device for eventual application to portable electronics. A platinum nanoparticle catalytic substrate was employed in a microcombustion-thermoelectric coupled (MTC) device for the purpose of chemical-to-electrical energy conversion. Multiple microcombustion reactors were designed, fabricated, and investigated. Most importantly, the reactor configuration was designed to accommodate thermoelectric generators (TEGs) for power production. Temperature studies with catalytic combustion of methanol-air fuel mixtures were used to evaluate the thermal power generation performance of each reactor. The final reactor design enabled ignition at room temperature with the ability to achieve repeat catalytic cycles upon subsequent exposure to …
Effect Of Microcapsule Content On Diels-Alder Room Temperature Self-Healing Thermosets., Sadella C Santos, John J La Scala, Giuseppe R Palmese
Effect Of Microcapsule Content On Diels-Alder Room Temperature Self-Healing Thermosets., Sadella C Santos, John J La Scala, Giuseppe R Palmese
Henry M. Rowan College of Engineering Departmental Research
A furan functionalized epoxy-amine thermoset with an embedded microcapsule healing system that utilizes reversible Diels-Alder healing chemistry was used to investigate the influence of microcapsule loading on healing efficiency. A urea-formaldehyde encapsulation technique was used to create capsules with an average diameter of 150 µm that were filled with a reactive solution of bismaleimide in phenyl acetate. It was found that optimum healing of the thermoset occurred at 10 wt% microcapsule content for the compositions investigated. The diffusion of solvent through the crack interface and within fractured samples was investigated using analytical diffusion models. The decrease in healing efficiency at …
Peristaltic Flow In The Glymphatic System., Francesco Romanò, Vinod Suresh, Peter Galie, James B Grotberg
Peristaltic Flow In The Glymphatic System., Francesco Romanò, Vinod Suresh, Peter Galie, James B Grotberg
Henry M. Rowan College of Engineering Departmental Research
The flow inside the perivascular space (PVS) is modeled using a first-principles approach in order to investigate how the cerebrospinal fluid (CSF) enters the brain through a permeable layer of glial cells. Lubrication theory is employed to deal with the flow in the thin annular gap of the perivascular space between an impermeable artery and the brain tissue. The artery has an imposed peristaltic deformation and the deformable brain tissue is modeled by means of an elastic Hooke's law. The perivascular flow model is solved numerically, discovering that the peristaltic wave induces a steady streaming to/from the brain which strongly …
The Sars-Cov-2 Spike Protein Alters Barrier Function In 2d Static And 3d Microfluidic In-Vitro Models Of The Human Blood-Brain Barrier., Tetyana P Buzhdygan, Brandon J Deore, Abigail Baldwin-Leclair, Trent A Bullock, Hannah M Mcgary, Jana A Khan, Roshanak Razmpour, Jonathan F Hale, Peter Galie, Raghava Potula, Allison M Andrews, Servio H Ramirez
The Sars-Cov-2 Spike Protein Alters Barrier Function In 2d Static And 3d Microfluidic In-Vitro Models Of The Human Blood-Brain Barrier., Tetyana P Buzhdygan, Brandon J Deore, Abigail Baldwin-Leclair, Trent A Bullock, Hannah M Mcgary, Jana A Khan, Roshanak Razmpour, Jonathan F Hale, Peter Galie, Raghava Potula, Allison M Andrews, Servio H Ramirez
Henry M. Rowan College of Engineering Departmental Research
As researchers across the globe have focused their attention on understanding SARS-CoV-2, the picture that is emerging is that of a virus that has serious effects on the vasculature in multiple organ systems including the cerebral vasculature. Observed effects on the central nervous system include neurological symptoms (headache, nausea, dizziness), fatal microclot formation and in rare cases encephalitis. However, our understanding of how the virus causes these mild to severe neurological symptoms and how the cerebral vasculature is impacted remains unclear. Thus, the results presented in this report explored whether deleterious outcomes from the SARS-CoV-2 viral spike protein on primary …
Comparative Analysis Of Extreme Verification Latency Learning Algorithms, Muhammad Umer, Robi Polikar
Comparative Analysis Of Extreme Verification Latency Learning Algorithms, Muhammad Umer, Robi Polikar
Henry M. Rowan College of Engineering Departmental Research
One of the more challenging real-world problems in computational intelligence is to learn from non-stationary streaming data, also known as concept drift. Perhaps even a more challenging version of this scenario is when -- following a small set of initial labeled data -- the data stream consists of unlabeled data only. Such a scenario is typically referred to as learning in initially labeled nonstationary environment, or simply as extreme verification latency (EVL). Because of the very challenging nature of the problem, very few algorithms have been proposed in the literature up to date. This work is a very first effort …
Optical-Amplifier-Compatible Long-Distance Secure Key Generation Based On Random Phase Fluctuations For Wdm Systems, Ben Wu, Yue-Kai Huang
Optical-Amplifier-Compatible Long-Distance Secure Key Generation Based On Random Phase Fluctuations For Wdm Systems, Ben Wu, Yue-Kai Huang
Henry M. Rowan College of Engineering Departmental Research
We proposed and experimentally demonstrated a secure key generation and distribution system that is compatible with optical amplifiers and standard wavelength-division multiplexing (WDM) transmission systems. The key is generated from the phase fluctuations induced by environmental instabilities. The key generation system is tested in a 240 km bidirectional fiber-pair link with multiple optical amplifiers. To demonstrate the compatibility with WDM systems, 38 WDM channels are transmitted together with the key distribution channel. The secret key is protected against eavesdropping and coherence detection attack by the wide-band property of the signal carrier and the fast-changing rate of the phase fluctuations.
Optimization Of Energy Absorption Performance Of Polymer Honeycombs By Density Gradation, Oyindamola Rahman, Behrad Koohbor
Optimization Of Energy Absorption Performance Of Polymer Honeycombs By Density Gradation, Oyindamola Rahman, Behrad Koohbor
Henry M. Rowan College of Engineering Departmental Research
Density gradation has been analytically and experimentally proven to enhance the load-bearing and energy absorption efficiency of cellular solids. This paper focuses on the analytical optimization (by virtual experiments) of polymeric honeycomb structures made from thermoplastic polyurethane to achieve density-graded structures with combined desired mechanical properties. The global stress-strain curves of single-density honeycomb structures are used as input to an analytical model that enables the characterization of the constitutive response of density-graded hexagonal honeycombs with discrete and continuous gradations and for various gradients. The stress-strain outputs are used to calculate the specific energy absorption, efficiency, and ideality metrics for all …
Comparative Study Of Silk-Based Magnetic Materials: Effect Of Magnetic Particle Types On The Protein Structure And Biomaterial Properties., Ye Xue, Samuel Lofland, Xiao Hu
Comparative Study Of Silk-Based Magnetic Materials: Effect Of Magnetic Particle Types On The Protein Structure And Biomaterial Properties., Ye Xue, Samuel Lofland, Xiao Hu
College of Science & Mathematics Departmental Research
This study investigates combining the good biocompatibility and flexibility of silk protein with three types of widely used magnetic nanoparticles to comparatively explore their structures, properties and potential applications in the sustainability and biomaterial fields. The secondary structure of silk protein was quantitatively studied by infrared spectroscopy. It was found that magnetite (Fe3O4) and barium hexaferrite (BaFe12O19) can prohibit β-sheet crystal due to strong coordination bonding between Fe3+ ions and carboxylate ions on silk fibroin chains where cobalt particles showed minimal effect. This was confirmed by thermal analysis, where a high temperature degradation peak was found above 640 °C in …
Sound Vortex Diffraction Via Topological Charge In Phase Gradient Metagratings, Yangyang Fu, Chen Shen, Xiaohui Zhu, Junfei Li, Youwen Liu, Steven A. Crummer
Sound Vortex Diffraction Via Topological Charge In Phase Gradient Metagratings, Yangyang Fu, Chen Shen, Xiaohui Zhu, Junfei Li, Youwen Liu, Steven A. Crummer
Henry M. Rowan College of Engineering Departmental Research
Wave fields with orbital angular momentum (OAM) have been widely investigated in metasurfaces. By engineering acoustic metasurfaces with phase gradient elements, phase twisting is commonly used to obtain acoustic OAM. However, it has limited ability to manipulate sound vortices, and a more powerful mechanism for sound vortex manipulation is strongly desired. Here, we propose the diffraction mechanism to manipulate sound vortices in a cylindrical waveguide with phase gradient metagratings (PGMs). A sound vortex diffraction law is theoretically revealed based on the generalized conservation principle of topological charge. This diffraction law can explain and predict the complicated diffraction phenomena of sound …
Engineered Full-Length Fibronectin-Hyaluronic Acid Hydrogels For Stem Cell Engineering., Sara Trujillo, Sebastian Vega, Kwang Hoon Song, Ana San Félix, Matthew J Dalby, Jason A Burdick, Manuel Salmeron-Sanchez
Engineered Full-Length Fibronectin-Hyaluronic Acid Hydrogels For Stem Cell Engineering., Sara Trujillo, Sebastian Vega, Kwang Hoon Song, Ana San Félix, Matthew J Dalby, Jason A Burdick, Manuel Salmeron-Sanchez
Henry M. Rowan College of Engineering Departmental Research
Mechanical cues induce a variety of downstream effects on cells, including the regulation of stem cell behavior. Cell fate is typically characterized on biomaterial substrates where mechanical and chemical properties can be precisely tuned; however, most of these substrates do not recapitulate the biological complexity of the extracellular matrix (ECM). Here, hydrogels are engineered for mechanobiological studies using two major components of the ECM: hyaluronic acid (HA) and fibronectin (FN). Rather than typical surface chemisorption of FN to substrates, the system contains full-length FN covalently crosslinked to HA throughout the hydrogel. The control over the mechanical properties of the hydrogel …
Dual Target Optimization Of Two-Dimensional Truss Using Cost Efficiency And Structural Reliability Sufficiency, Mohammad Rezaee, Seyed Hooman Ghasemi, Mansoureh Rezaee
Dual Target Optimization Of Two-Dimensional Truss Using Cost Efficiency And Structural Reliability Sufficiency, Mohammad Rezaee, Seyed Hooman Ghasemi, Mansoureh Rezaee
Henry M. Rowan College of Engineering Departmental Research
The main contribution of this study is to open a discussion regarding the structural optimization associated with the cost efficiency and structural reliability sufficiency consideration. To do so, several various optimization approaches are investigated to deliberate both cost and reliability concerns. Particularly, particle swarm optimization is highlighted as a reliable optimization approach. Accordingly, an illustrative example is rendered to compare the feasibility of the considered optimization approaches. The feasibility of the investigated approaches is evaluated using the cost and reliability analysis. For the considered example, it was observed that the PSO optimization algorithm has multiple advantages such as easy realization, …
Evaluating The Effectiveness Of The Pedestrian Safety Intervention Program: Behavioral And Observational Approach, Deep Patel
Theses and Dissertations
Pedestrians are considered as the most vulnerable road users. On a nationwide scale, according to the National Highway Traffic Safety Administration, there were 6,075 pedestrian fatalities and more than 85,000 pedestrian injuries as a result of traffic crashes in 2017. This study provides national and state pedestrian fatality statistics, a systematic literature review of pedestrian injury severity, observational (video-based) & behavioral (survey-based) evaluation of the Street-Smart NJ pedestrian safety intervention campaign. Street-Smart NJ is a public education, awareness, and behavioral change campaign program that aims to improve pedestrian safety by increasing awareness of pedestrian safety risks and improving compliance with …
Advancing Transportation Routing Decisions Using Riemannian Manifold Surfaces, Emre Tokgöz, Iddrisu Awudu, Saravanan Kuppusamy
Advancing Transportation Routing Decisions Using Riemannian Manifold Surfaces, Emre Tokgöz, Iddrisu Awudu, Saravanan Kuppusamy
Rohrer College of Business Departmental Research
We consider several real-world driving factors such as the time spent at traffic signs (e.g., yield signs and stop signs), speed limits, and the topology of the surface to develop realistic and accurate routing solutions. Though these factors increase the complexity of modeling, they provide the flexibility to evaluate the routing solutions from different perspectives: cost, distance, and time, to name a few. First, we develop a set of algorithms based on the Riemannian manifold surface (RMS) to factor in the Earth’s curvature to calculate distances. Second, we present a multiobjective, nonlinear, mixed-integer model (MINLP) that minimizes the distance traveled, …
Application Of Satellite Remote Sensing In Monitoring Elevated Internal Temperatures Of Landfills, Rouzbeh Nazari, Husam Alfergani, Francis M. Haas, Maryam E. Karimi, Md Golam Rabbani Fahad, Samain Sabrin, Jess Everett, Nidhal Carla Bouaynaya, Robert W. Peters
Application Of Satellite Remote Sensing In Monitoring Elevated Internal Temperatures Of Landfills, Rouzbeh Nazari, Husam Alfergani, Francis M. Haas, Maryam E. Karimi, Md Golam Rabbani Fahad, Samain Sabrin, Jess Everett, Nidhal Carla Bouaynaya, Robert W. Peters
Henry M. Rowan College of Engineering Departmental Research
Subsurface fires and smoldering events at landfills can present serious health hazards and threats to the environment. These fires are much more costly and difficult to extinguish than open fires at the landfill surface. The initiation of a subsurface fire may go unnoticed for a long period of time and undetected fires may spread over a large area. Unfortunately, not all landfill operators keep or publish heat elevation data and many landfills are not equipped with a landfill gas extraction system to control subsurface temperatures generated from the chemical reactions within. The timely and cost-effective identification of subsurface fires is …
Evaluation Of Impact Of Fiber Type And Dosage Rate On Volumetrics And Laboratory Performance Of Asphalt Mixtures, Ahmad G. M. Alfalah
Evaluation Of Impact Of Fiber Type And Dosage Rate On Volumetrics And Laboratory Performance Of Asphalt Mixtures, Ahmad G. M. Alfalah
Theses and Dissertations
The purpose of this study is to evaluate the impact of fiber types, binder content, and dosage rates on the volumetric properties and laboratory performance of asphalt mixtures. One asphalt mixture (control) and four fiber types (Fiberglass, Basalt, Carbon, and Polyolefin/Aramid) were used to evaluate the impact of fiber types and dosage rates. Two mixing procedures for introducing fibers into asphalt mixtures were also evaluated: dry and proportional dispersion methods. To evaluate the impact of fiber types, 0.16% by total mix weight was used. Rutting, cracking, and durability performance tests were evaluated. Furthermore, using 0.15% and 0.3% fiber dosage rates, …
Epoxy-Functional Thermoplastic Copolymers And Their Incorporation Into Thermosetting Resins, Kayla Rose Sweet
Epoxy-Functional Thermoplastic Copolymers And Their Incorporation Into Thermosetting Resins, Kayla Rose Sweet
Theses and Dissertations
While polymers have secured a place in the consumer, industrial, and military markets over the last seventy years, the next generation of polymers must become more renewable, more adaptive, and higher performing to bridge industrial needs and environmental gaps. To this end, unique network configurations of copolymers and interpenetrating polymer networks (IPNs) have been employed to combine features of two or more polymers into a single material that surpasses the sum of its parts. The customization of polymer networks can be made possible via dual-functional monomers, molecules characterized by two different reactive substituents that allow for versatile methods of polymerization. …
Synthesis And Characterization Of Thermosetting Epoxy Resins From Lignin-Inspired Phenolics, Kelli Marie Hambleton
Synthesis And Characterization Of Thermosetting Epoxy Resins From Lignin-Inspired Phenolics, Kelli Marie Hambleton
Theses and Dissertations
The need for renewable polymers able to replace their petrochemical counterparts continues to grow as sustainability concerns constantly rise. Bisguaiacol, a bio-based alternative to bisphenol-A, has been synthesized using vanillyl alcohol and guaiacol via an electrophilic aromatic condensation. Purification provides both bisguaiacol and an oligomeric coproduct with a consistent number average molecular weight and dispersity of about 650 Da and 1.00, respectively, across multiple reaction volume scales. This coproduct has been well characterized as a low molecular weight novolac averaging 5 hydroxyls per molecule and was transformed into an epoxy resin suitable for use in thermosetting resin development. By utilizing …
Epoxidation Of Cardanol's Terminal Double Bond., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese
Epoxidation Of Cardanol's Terminal Double Bond., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese
Henry M. Rowan College of Engineering Departmental Research
In this investigation, the terminal double bonds of the side chain epoxidized cardanol glycidyl ether (SCECGE) molecule were further epoxidized in the presence of Oxone® (potassium peroxomonosulfate) and fluorinated acetone. Regular methods for the double bond epoxidation are not effective on the terminal double bonds because of their reduced electronegativity with respect to internal double bonds. The terminal double bond functionality of the SCECGE was epoxidized to nearly 70%, increasing the epoxy functionality of SCECGE from 2.45 to 2.65 epoxies/molecule as measured using proton magnetic nuclear resonance (1H-NMR). This modified material—side chain epoxidized cardanol glycidyl ether with terminal epoxies (TE-SCECGE)—was …
Formulation Of A Model Resin System For Benchmarking Processing-Property Relationships In High-Performance Photo 3d Printing Applications., Jianwei Tu, Kamran Makarian, Nicolas J Alvarez, Giuseppe R Palmese
Formulation Of A Model Resin System For Benchmarking Processing-Property Relationships In High-Performance Photo 3d Printing Applications., Jianwei Tu, Kamran Makarian, Nicolas J Alvarez, Giuseppe R Palmese
Henry M. Rowan College of Engineering Departmental Research
A well-defined resin system is needed to serve as a benchmark for 3D printing of high-performance composites. This work describes the design and characterization of such a system that takes into account processability and performance considerations. The Grunberg–Nissan model for resin viscosity and the Fox equation for polymer Tg were used to determine proper monomer ratios. The target viscosity of the resin was below 500 cP, and the target final Tg of the cured polymer was 150 °C based on tan-δ peak from dynamic mechanical analysis. A tri-component model resin system, termed DA-2 resin, was determined and fully characterized. The …
Investigating Effects Of Landfill Soil Gases On Landfill Elevated Subsurface Temperature, Samain Sabrin, Rouzbeh Nazari, Md Golam Rabbani Fahad, Maryam Kirimi, Jess Everett, Robert W. Peters
Investigating Effects Of Landfill Soil Gases On Landfill Elevated Subsurface Temperature, Samain Sabrin, Rouzbeh Nazari, Md Golam Rabbani Fahad, Maryam Kirimi, Jess Everett, Robert W. Peters
Henry M. Rowan College of Engineering Departmental Research
Subsurface temperature is a critical indicator for the identification of the risk associated with subsurface fire hazards in landfills. Most operational landfills in the United States (US) have experienced exothermic reactions in their subsurface. The subsurface landfill area is composed of various gases generated from chemical reactions inside the landfills. Federal laws in the US mandate the monitoring of gases in landfills to prevent hazardous events such as landfill fire breakouts. There are insufficient investigations conducted to identify the causes of landfill fire hazards. The objective of this research is to develop a methodological approach to this issue. In this …
Influence Of Epoxidized Cardanol Functionality And Reactivity On Network Formation And Properties., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese
Influence Of Epoxidized Cardanol Functionality And Reactivity On Network Formation And Properties., Emre Kinaci, Erde Can, John J La Scala, Giuseppe R Palmese
Henry M. Rowan College of Engineering Departmental Research
Cardanol is a renewable resource based on cashew nut shell liquid (CNSL), which consists of a phenol ring with a C15 long aliphatic side chain in the meta position with varying degrees of unsaturation. Cardanol glycidyl ether was chemically modified to form side-chain epoxidized cardanol glycidyl ether (SCECGE) with an average epoxy functionality of 2.45 per molecule and was cured with petroleum-based epoxy hardeners, 4-4'-methylenebis(cyclohexanamine) and diethylenetriamine, and a cardanol-based amine hardener. For comparison, cardanol-based diphenol diepoxy resin, NC514 (Cardolite), and a petroleum-based epoxy resin, diglycidyl ether of bisphenol-A (DGEBA) were also evaluated. Chemical and thermomechanical analyses showed that for …
Bioprinted In Vitro Model Of Human Glioblastoma, Rachel Lauren Schwartz
Bioprinted In Vitro Model Of Human Glioblastoma, Rachel Lauren Schwartz
Theses and Dissertations
Glioblastoma multiform (GBM) is one of the most aggressive forms of primary brain tumors. GBM is fast progressing and resistant to treatment, resulting in a low survival rate. Conventional 2-dimensional tissue culture models cannot fully replicate the complexities of cancer lesions that contain multiple cell types and structures (e.g. vessels composed of endothelial cells, cancer cells, normal cells, etc.) as well as an intricate scaffold of proteins comprising the extracellular matrix (ECM). In addition, animal models cannot translate into the clinical disease in patients. Thus, this study has developed a bioprintable organ-on-a-chip (OOAC) model that mimics the important ECM factors …
Divergence Of The Dielectric Constant In Ultrathin Granular Metal Films Near The Percolation Threshold, H. Bakkali, E. Blanco, Samuel Lofland, M. Dominguez
Divergence Of The Dielectric Constant In Ultrathin Granular Metal Films Near The Percolation Threshold, H. Bakkali, E. Blanco, Samuel Lofland, M. Dominguez
College of Science & Mathematics Departmental Research
We report on the electronic and optical properties of ultrathin granular films. We demonstrate that the static dielectric constant increases with thickness in the dielectric regime and diverges at the critical thickness, as predicted by classical percolation theory. However, for thicker samples, the dc conductivity does not obey scaling laws due to the presence of tunneling conduction. In this region the dielectric constant is positive, and the electronic transport is not metallic but can be described by Jonscher's universal power law, even though there is a Drude-like response indicating the presence of free charge carriers. Only for thicker films when …
Artificial Intelligence For Helicopter Safety: Head Pose Estimation In The Cockpit, Eric William Feuerstein
Artificial Intelligence For Helicopter Safety: Head Pose Estimation In The Cockpit, Eric William Feuerstein
Theses and Dissertations
The recent impact of deep learning algorithms and their major breakthroughs on various aspects of our lives has led to the idea to investigate the application of these algorithms in different problem spaces. One of the novel areas of investigation is the aviation and air traffic control domain; as it offers a prime opportunity to enhance safety within the aviation community. Of particular importance to this community is improving the safety of rotorcraft operations, as this segment of the aviation industry is subject to a higher fatal accident rate than other segments of the industry. The improvement of safety for …
In Situ Electric-Field Study Of Surface Effects In Domain Engineered Pb(In1/2nb1/2)O3-Pb(Mg1/3nb2/3)O3-Pbtio3 Relaxor Crystals By Grazing Incidence Diffraction, Markys G. Cain, Margo Staruch, Paul Thompson, Christopher Lucas, Didier Wermeille, Yves Kayser, Burkhard Beckhoff, Samuel Lofland, Peter Finkel
In Situ Electric-Field Study Of Surface Effects In Domain Engineered Pb(In1/2nb1/2)O3-Pb(Mg1/3nb2/3)O3-Pbtio3 Relaxor Crystals By Grazing Incidence Diffraction, Markys G. Cain, Margo Staruch, Paul Thompson, Christopher Lucas, Didier Wermeille, Yves Kayser, Burkhard Beckhoff, Samuel Lofland, Peter Finkel
College of Science & Mathematics Departmental Research
In this work, we present a grazing incidence X-ray diffraction study of the surface of a 0.24Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT) [011] poled rhombohedral single crystal. The near surface microstructure (the top several tens to hundreds of unit cells) was measured in situ under an applied electric field. The strains calculated from the change in lattice parameters have been compared to the macroscopic strain measured with a strain gauge affixed to the sample surface. The depth dependence of the electrostrain at the crystal surface was investigated as a function of temperature. The analysis revealed hidden sweet spots featuring unusually high strains that were …
Laboratory Evaluation Of The Impact Of Additives On Asphalt Binders Used In Cold Regions, Neirouz Bouhrira
Laboratory Evaluation Of The Impact Of Additives On Asphalt Binders Used In Cold Regions, Neirouz Bouhrira
Theses and Dissertations
The objective of this research study is to evaluate the effect of additives (polymers, nanomaterials, and softening agents) on rutting, cracking, and fatigue performance of asphalt binders commonly used in cold regions (PG 52-34 and PG 64E-40). In this study, the first phase consisted of using polymers (Styrene-Butadiene-Styrene, Ground-Tire-Rubber) and nanomaterials (TiO2 and SiO2) to modify two asphalt binders used in cold regions (PG52-34 and PG64E-40). The second phase of the study consisted of adding a combination of softening agents (Corn oil or Sylvaroad) with polymers (SBR, Epoxy, and SBS) to PG52-34 asphalt binder. The performance evaluation was conducted using …
Protein And Polysaccharide-Based Fiber Materials Generated From Ionic Liquids: A Review., Christopher R Gough, Ashley Rivera-Galletti, Darrel A Cowan, David Salas-De La Cruz, Xiao Hu
Protein And Polysaccharide-Based Fiber Materials Generated From Ionic Liquids: A Review., Christopher R Gough, Ashley Rivera-Galletti, Darrel A Cowan, David Salas-De La Cruz, Xiao Hu
College of Science & Mathematics Departmental Research
Natural biomacromolecules such as structural proteins and polysaccharides are composed of the basic building blocks of life: amino acids and carbohydrates. Understanding their molecular structure, self-assembly and interaction in solvents such as ionic liquids (ILs) is critical for unleashing a flora of new materials, revolutionizing the way we fabricate multi-structural and multi-functional systems with tunable physicochemical properties. Ionic liquids are superior to organic solvents because they do not produce unwanted by-products and are considered green substitutes because of their reusability. In addition, they will significantly improve the miscibility of biopolymers with other materials while maintaining the mechanical properties of the …
High‐Tensile Strength, Composite Bijels Through Microfluidic Twisting, S. P. Kharal, Robert P. Hesketh, Martin F. Haase
High‐Tensile Strength, Composite Bijels Through Microfluidic Twisting, S. P. Kharal, Robert P. Hesketh, Martin F. Haase
Henry M. Rowan College of Engineering Departmental Research
Rope making is a millennia old technique to collectively assemble numerous weak filaments into flexible and high tensile strength bundles. However, delicate soft matter fibers lack the robustness to be twisted into bundles by means of mechanical rope making tools. Here, weak microfibers with tensile strengths of a few kilopascals are combined into ropes via microfluidic twisting. This is demonstrated for recently introduced fibers made of bicontinuous interfacially jammed emulsion gels (bijels). Bijels show promising applications in use as membranes, microreactors, energy and healthcare materials, but their low tensile strength make reinforcement strategies imperative. Hydrodynamic twisting allows to produce continuous …
Remediation Of Desiccation Cracking In Clayey Soils Through Bio-Cementation And Bottom Ash, Mark Vail
Remediation Of Desiccation Cracking In Clayey Soils Through Bio-Cementation And Bottom Ash, Mark Vail
Theses and Dissertations
Desiccation cracking considerably impairs the hydraulic and mechanical properties of clayey soils and is critical to the long-term performance of infrastructure foundations and earth structures. Classical crack remediation methods are associated with high labor and maintenance costs or the usage of environment-unfriendly chemicals. Recycling waste materials and developing bio-mediated techniques have emerged as green and sustainable soil stabilization solutions. The objective of this study is to investigate the feasibility of soil crack remediation through the usage of microbial-induced calcite precipitation (MICP) and bottom ash admixtures. We carry out monotonic drying and cyclic drying-wetting tests to characterize the effects of bottom …