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Articles 4411 - 4440 of 21795
Full-Text Articles in Engineering
A Mine Main Fans Switchover System With Lower Air Flow Volatility Based On Improved Particle Swarm Optimization Algorithm, Hengqing Ge, Guang Xu, Jinxin Huang, Xiaoping Ma
A Mine Main Fans Switchover System With Lower Air Flow Volatility Based On Improved Particle Swarm Optimization Algorithm, Hengqing Ge, Guang Xu, Jinxin Huang, Xiaoping Ma
Mining Engineering Faculty Research & Creative Works
A reliable ventilation system is essential for maintaining a comfortable working environment and ensuring safety production in an underground coal mine. The automated fan switchover technique was developed for changing the main fan for maintenance with lower air flow volatility of underground mine in the switchover process. This article established the optimization model in the main fans switchover process, used the improved particle swarm optimization algorithm to solve the model, and achieved minimum air flow volatility in the fans switchover process. Compared to previous studies, computer simulations have shown that the proposed algorithm can effectively find the global optimal solution …
Simulation Study Of 4h-Sic Trench Mosfets With Various Gate Structures, Jheng Yi Jiang, Chih Fang Huang, Tian Li Wu, Feng Zhao
Simulation Study Of 4h-Sic Trench Mosfets With Various Gate Structures, Jheng Yi Jiang, Chih Fang Huang, Tian Li Wu, Feng Zhao
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we systematically study the effect of gate structures of a 4H-SiC UMOSFET on its performance, focusing on the fast-switching performance. Based on the simulation results, DC and AC characteristics of different gate structures are compared. It is found that a structure of UMOSFET, combining a grounded split-gate (SG), a trench bottom protection P+ shielding layer (PS) and a current spreading layer (CSL), yields the best compromise.
A Compact Dual-Frequency Base-Station Dipole Array With Amc Reflector, Min Li, Lijun Jiang
A Compact Dual-Frequency Base-Station Dipole Array With Amc Reflector, Min Li, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
A compact dual-frequency dipole array is presented for use in base stations operating in the Digital Cellular System (DCS) and Wideband Code Division Multiple Access (WCDMA) bands. The size-miniaturization is realized by utilizing band notch dipole (BND) as array element and artificial magnetic conductor (AMC) as array reflector for reductions in array width and profile height, respectively. Simulation results show that good impedance matching, high antenna isolation, and good radiation performances are achieved simultaneously.
On The Feasibility Of Tailoring Copper-Nickel Functionally Graded Materials Fabricated Through Laser Metal Deposition, Sreekar Karnati, Yunlu Zhang, Frank W. Liou, Joseph William Newkirk
On The Feasibility Of Tailoring Copper-Nickel Functionally Graded Materials Fabricated Through Laser Metal Deposition, Sreekar Karnati, Yunlu Zhang, Frank W. Liou, Joseph William Newkirk
Mechanical and Aerospace Engineering Faculty Research & Creative Works
In this study, pulse‐width modulation of laser power was identified as a feasible means for varying the chemical gradient in copper—nickel‐graded materials. Graded material deposits of 70 wt. %. copper‐30 wt. %. nickel on 100 wt. %. nickel and vice versa were deposited and characterized. The 70/30 copper—nickel weight ratio in the feedstock powder was achieved through blending elemental copper and 96 wt. %. Ni—Delero‐22 alloy. At the dissimilar material interface over the course of four layers, the duty cycle of power was ramped down from a high value to optimized deposition conditions. This change was theorized to influence the …
Assessment Of Turbulence Models In A Hypersonic Cold-Wall Turbulent Boundary Layer, Junji Huang, Jorge-Valentino Bretzke, Lian Duan
Assessment Of Turbulence Models In A Hypersonic Cold-Wall Turbulent Boundary Layer, Junji Huang, Jorge-Valentino Bretzke, Lian Duan
Mechanical and Aerospace Engineering Faculty Research & Creative Works
In this study, the ability of standard one- or two-equation turbulence models to predict mean and turbulence profiles, the Reynolds stress, and the turbulent heat flux in hypersonic cold-wall boundary-layer applications is investigated. The turbulence models under investigation include the one-equation model of Spalart-Allmaras, the baseline k-ω model by Menter, as well as the shear-stress transport k-ω model by Menter. Reynolds-Averaged Navier-Stokes (RANS) simulations with the different turbulence models are conducted for a flat-plate, zero-pressure-gradient turbulent boundary layer with a nominal free-stream Mach number of 8 and wall-to-recovery temperature ratio of 0.48, and the RANS results are compared with those …
Quasi-Continuous Metasurfaces For Orbital Angular Momentum Generation, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha
Quasi-Continuous Metasurfaces For Orbital Angular Momentum Generation, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha
Electrical and Computer Engineering Faculty Research & Creative Works
A quasi-continuous composite perfect electric conductor-perfect magnetic conductor metasurface and a systematic metasurface design process are proposed for the orbital angular momentum (OAM) generation. The metasurfaces reflect the incident left circularly polarized (LCP)/right circularly polarized (RCP) plane wave to RCP/LCP vortex beams carrying OAM at normal or oblique direction. Unlike conventional metasurfaces that are composed of discrete scatterers, the scatterers on the proposed metasurface form a quasi-continuous pattern. The patterning of the metasurface is calculated through grating vectors, and no optimization of single scatterer is required. Furthermore, the distortions from local-response discontinuity of discrete scatterers are avoided. This letter provides …
Generation Of Orbital Angular Momentum In 3d Photonic Crystals, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha
Generation Of Orbital Angular Momentum In 3d Photonic Crystals, Menglin L.N. Chen, Li (Lijun) Jun Jiang, Wei E.I. Sha
Electrical and Computer Engineering Faculty Research & Creative Works
An approach to producing electromagnetic (EM) waves carrying orbital angular momentum (OAM) by using three-dimensional (3D) photonic crystals (PCs) is proposed. By introducing a point defect in the PCs, a localized rotation mode is excited and then radiated out through a circular opening upon the defect. The radiated wave carries well-defined OAM. The lowest four OAM modes, i.e., OAM indices of ±1 and ±2, are successfully generated. The effectiveness of our approach is validated by both full-wave simulations and experiments.
Improving The Drive Current Of Algan/Gan Hemt Using External Strain Engineering, Wei Chih Cheng, Siqi Lei, Wenmao Li, Feng Zhao, Mansun Chan, Hongyu Yu
Improving The Drive Current Of Algan/Gan Hemt Using External Strain Engineering, Wei Chih Cheng, Siqi Lei, Wenmao Li, Feng Zhao, Mansun Chan, Hongyu Yu
Electrical and Computer Engineering Faculty Research & Creative Works
The concentration of the two-dimensional electron gas (2DEG) at the AlGaN/GaN heterojunction is dominated by the stress developed in AlGaN layer. In this work, the output performance of AlGaN/GaN high electron mobility transistors (HEMTs) was improved by depositing a stressed SiNx as a passivation layer, and the external strain applied onto AlGaN was measured using Raman spectroscopy. As a result, an improvement in on-state resistance and drive current of the device was attained due to the extra 2DEG concentration induced by the external strain. Also, to determine the strain-induced threshold-voltage shift, the stress distribution over the gate region was analyzed.
Cutter Elements For Drill Bits And Methods For Fabricating Same, Guodong Zhan, Biju P. Kumar, Russell C. Gilleylen, Michael D. Hughes, Xinhua Liang
Cutter Elements For Drill Bits And Methods For Fabricating Same, Guodong Zhan, Biju P. Kumar, Russell C. Gilleylen, Michael D. Hughes, Xinhua Liang
Chemical and Biochemical Engineering Faculty Research & Creative Works
A method of fabricating a PCD cutter element including a diamond table including a plurality of coated diamond particles fabricated using an atomic layer deposition (ALD) process.
Cutter Elements For Drill Bits And Methods For Fabricating Same, Guodong Zhan, Biju Pillai Kumar, Russell C. Gilleylen, Michael D. Hughes, Xinhua Liang
Cutter Elements For Drill Bits And Methods For Fabricating Same, Guodong Zhan, Biju Pillai Kumar, Russell C. Gilleylen, Michael D. Hughes, Xinhua Liang
Chemical and Biochemical Engineering Faculty Research & Creative Works
A method of fabricating a PCD cutter element including a diamond table including a plurality of coated diamond particles fabricated using an atomic layer deposition (ALD) process.
Characterization And Quantification Of Highly Sulfated Glycosaminoglycan Isomers By Gated-Trapped Ion Mobility Spectrometry Negative Electron Transfer Dissociation Ms/Ms, Juan Wei, Jiandong Wu, Yang Tang, Mark E. Ridgeway, Melvin A. Park, Catherine E. Costello, Joseph Zaia, Cheng Lin
Characterization And Quantification Of Highly Sulfated Glycosaminoglycan Isomers By Gated-Trapped Ion Mobility Spectrometry Negative Electron Transfer Dissociation Ms/Ms, Juan Wei, Jiandong Wu, Yang Tang, Mark E. Ridgeway, Melvin A. Park, Catherine E. Costello, Joseph Zaia, Cheng Lin
Chemical and Biochemical Engineering Faculty Research & Creative Works
Glycosaminoglycans (GAGs) Play Vital Roles in Many Biological Processes and Are Naturally Present as Complex Mixtures of Polysaccharides with Tremendous Structural Heterogeneity, Including Many Structural Isomers. Mass Spectrometric Analysis of GAG Isomers, in Particular Highly Sulfated Heparin (Hep) and Heparan Sulfate (HS), is Challenging Because of their Structural Similarity and Facile Sulfo Losses during Analysis. Herein, We Show that Highly Sulfated Hep/HS Isomers May Be Resolved by Gated-Trapped Ion Mobility Spectrometry (Gated-TIMS) with Negligible Sulfo Losses. Subsequent Negative Electron Transfer Dissociation (NETD) Tandem Mass Spectrometry (MS/MS) Analysis of TIMS-Separated Hep/HS Isomers Generated Extensive Glycosidic and Cross-Ring Fragments for Confident Isomer …
Substrate Support Ring For More Uniform Layer Thickness, Heng Pan, Lara Hawrylchak, Christopher S. Olsen
Substrate Support Ring For More Uniform Layer Thickness, Heng Pan, Lara Hawrylchak, Christopher S. Olsen
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Embodiments of substrate support rings providing more uniform thickness of layers deposited or grown on a substrate are provided herein. In some embodiments, a substrate support ring includes: an inner ring with a centrally located support surface to support a substrate; and an outer ring extending radially outward from the support surface, wherein the outer ring comprises a reaction surface area disposed above and generally parallel to a support plane of the support surface, and wherein the reaction surface extends beyond the support surface by about 24 mm to about 45 mm.
The Effect Of Calcination Rate On The Structure Of Mesoporous Bioactive Glasses, Saidur Rahman, Andrew Mendonca, Adel Alhalawani, Deanna Polintan, Owen M. Clarkin, Mark R. Towler
The Effect Of Calcination Rate On The Structure Of Mesoporous Bioactive Glasses, Saidur Rahman, Andrew Mendonca, Adel Alhalawani, Deanna Polintan, Owen M. Clarkin, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
Mesoporous bioactive glasses (MBGs) are designed to have high specific surface area. They are formulated by a sol–gel process to formulate the glass followed by calcination. This study evaluates how calcination heating rate influences the porous architecture, and thereby the specific surface area, of MBGs. MBGs of molar ratio 80:15:5 for SiO2 :CaO:P2 O 5 were calcined using both low (1 °C/min) and high (20 °C/min) heating rates, termed as L-MBG and H-MBG, respectively. The results obtained from small-angle X-ray diffraction (SAXRD) confirm that the MBGs possess 2D hexagonal (P6mm) spacing groups and wide-angle XRD confirms the amorphicity …
Revealing The Effects Of Matrix Behavior On Low-Velocity Impact Response Of Continuous Fiber-Reinforced Thermoplastic Laminates, A. Yudhanto, H. Wafai, G. Lubineau, S. Goutham, M. Mulle, R. Yaldiz, N. Verghese
Revealing The Effects Of Matrix Behavior On Low-Velocity Impact Response Of Continuous Fiber-Reinforced Thermoplastic Laminates, A. Yudhanto, H. Wafai, G. Lubineau, S. Goutham, M. Mulle, R. Yaldiz, N. Verghese
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Matrix behavior is expected to widely influence the impact response of composites, but detailed conclusions in the case of thermoplastic laminates are still needed. In this paper, we investigated the effect of using either ductile homopolymer PP or less-ductile impact copolymer PP matrices on the low-velocity impact responses of continuous glass fiber-reinforced polypropylene (PP) laminate. These PP types represent two variants in the same family of thermoplastic matrix. A thorough experimental campaign was first performed to provide the tensile properties (for PP and glass/PP) and fracture toughness (Mode-I and Mode-II, glass/PP only) of the employed materials. Then, low-velocity impact tests …
In Situ Micro-Scale High-Speed Imaging For Evaluation Of Fracture Propagation And Fracture Toughness Of Thermoplastic Laminates Subjected To Impact, H. Wafai, A. Yudhanto, G. Lubineau, M. Mulle, T. Alghamdi, S. T. Thoroddsen, R. Yaldiz, N. Verghese
In Situ Micro-Scale High-Speed Imaging For Evaluation Of Fracture Propagation And Fracture Toughness Of Thermoplastic Laminates Subjected To Impact, H. Wafai, A. Yudhanto, G. Lubineau, M. Mulle, T. Alghamdi, S. T. Thoroddsen, R. Yaldiz, N. Verghese
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Measuring parameters related to each damage mode of composites subjected to impact is very challenging because of the complex damage phenomenology. Here, we developed an experimental methodology for evaluating the micro-scale fracture characteristics of two principal damage modes, i.e., transverse crack and delamination, and providing the corresponding fracture toughness. We demonstrated the capability of the method by comparing and providing additional insights about two materials, namely homopolymer-based (ductile) and copolymer-based (less-ductile) glass/polypropylene thermoplastic composites. We found that (i) transverse crack behavior of both composites is similar as indicated by a small difference in their fracture toughness, (ii) delamination growth in …
Ultra-Lightweight Mutual Authentication Protocol With Substitution Operation, Al Salour, Douglas D. Trimble, Jagannathan Sarangapani, Eyad S. Taqieddin
Ultra-Lightweight Mutual Authentication Protocol With Substitution Operation, Al Salour, Douglas D. Trimble, Jagannathan Sarangapani, Eyad S. Taqieddin
Electrical and Computer Engineering Faculty Research & Creative Works
A method comprises using at least one of a reader and a passive tag to exchange values according to an ultra-lightweight mutual authentication protocol with a substitution operation to change a Hamming weight of the values.
Mechanism Of Tricalcium Silicate Hydration In The Presence Of Polycarboxylate Polymers, Rachel Cook, Hongyan Ma, Aditya Kumar
Mechanism Of Tricalcium Silicate Hydration In The Presence Of Polycarboxylate Polymers, Rachel Cook, Hongyan Ma, Aditya Kumar
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Abstract: The early-age hydration of cement is inhibited in the presence of comb-shaped polycarboxylate ether (PCE) polymer -- a dispersant commonly added to control rheological properties of fresh cement paste. This study employs a series of microcalorimetry experiments and phase boundary nucleation and growth simulations to elucidate the effects of dosage and molecular architecture of PCE on hydration of tricalcium silicate (Ca3SiO5 or C3S in cement notation), the dominant phase in cement. Results show that PCE -- regardless of its molecular architecture -- suppresses early-age hydration of C3S. PCE-induced retardation becomes increasingly more …
Balancing The Performance And Environmental Concerns Of Used Motor Oil As Rejuvenator In Asphalt Mixes, Eslam Deef-Allah, Magdy Abdelrahman, Mark W. Fitch, Mohyeldin Ragab, Mousumi Bose, Xiaolong He
Balancing The Performance And Environmental Concerns Of Used Motor Oil As Rejuvenator In Asphalt Mixes, Eslam Deef-Allah, Magdy Abdelrahman, Mark W. Fitch, Mohyeldin Ragab, Mousumi Bose, Xiaolong He
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Road deterioration inspires researchers to enhance the properties of asphalt binder for better performing mixes. Recycled tire rubber, or crumb rubber modifier (CRM), and used motor oil (UMO) are two modifiers that enhance asphalt binder performance through two different mechanisms. CRM affects high-temperature properties while UMO modifies low-temperature properties. Potential environmental concerns arising from the use of UMO have been raised in the literature. In this paper, the two recycled materials were investigated for their ability to complement each other. Both performance benefits of using both materials and the environmental concerns of using UMO were studied. Four CRM asphalt binders …
Preformed Partial Gel Injection Chased By Low-Salinity Waterflooding In Fractured Carbonate Cores, Ali K. Alhuraishawy, Baojun Bai, Mingzhen Wei, Abdullah Almansour
Preformed Partial Gel Injection Chased By Low-Salinity Waterflooding In Fractured Carbonate Cores, Ali K. Alhuraishawy, Baojun Bai, Mingzhen Wei, Abdullah Almansour
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Fractures and oil-wet conditions significantly limit oil recovery in carbonate reservoirs. Gel treatment has been applied in injector wells to modify the prevailing reservoir streamlines and significantly reduce fracture permeability, whereas low-salinity waterflooding has been applied experimentally to modify rock wettability toward water-wet for improved oil recovery. However, both processes have limitations that cannot be resolved using a single method. The objective of this study was to test whether low-salinity water could enable gel particles to move deeply into fractures to efficiently increase oil recovery and control water production. A semitransparent fracture model of carbonate cores and acrylic plates was …
Review Of Fiber Optic Sensors For Structural Fire Engineering, Yi Bao, Ying Huang, Matthew S. Hoehler, Genda Chen
Review Of Fiber Optic Sensors For Structural Fire Engineering, Yi Bao, Ying Huang, Matthew S. Hoehler, Genda Chen
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Reliable and accurate measurements of temperature and strain in structures subjected to fire can be difficult to obtain using traditional sensing technologies based on electrical signals. Fiber optic sensors, which are based on light signals, solve many of the problems of monitoring structures in high temperature environments; however, they present their own challenges. This paper, which is intended for structural engineers new to fiber optic sensors, reviews various fiber optic sensors that have been used to make measurements in structure fires, including the sensing principles, fabrication, key characteristics, and recently-reported applications. Three categories of fiber optic sensors are reviewed: Grating-based …
Raman Spectroscopy As A Predictive Tool For Monitoring Osteoporosis Therapy In A Rat Model Of Postmenopausal Osteoporosis, J. Renwick Beattie, Antonia Sophocleous, M. Clare Caraher, Olive O'Driscoll, Niamh M. Cummins, Steven E.J. Bell, Mark R. Towler, Alireza Rahimnejad Yazdi, Stuart H. Ralston, Aymen I. Idris
Raman Spectroscopy As A Predictive Tool For Monitoring Osteoporosis Therapy In A Rat Model Of Postmenopausal Osteoporosis, J. Renwick Beattie, Antonia Sophocleous, M. Clare Caraher, Olive O'Driscoll, Niamh M. Cummins, Steven E.J. Bell, Mark R. Towler, Alireza Rahimnejad Yazdi, Stuart H. Ralston, Aymen I. Idris
Chemical and Biochemical Engineering Faculty Research & Creative Works
Pharmacological therapy of osteoporosis reduces bone loss and risk of fracture in patients. Modulation of bone mineral density cannot explain all effects. Other aspects of bone quality affecting fragility and ways to monitor them need to be better understood. Keratinous tissue acts as surrogate marker for bone protein deterioration caused by oestrogen deficiency in rats. Ovariectomised rats were treated with alendronate (ALN), parathyroid hormone (PTH) or estrogen (E2). MicroCT assessed macro structural changes. Raman spectroscopy assessed biochemical changes. Micro CT confirmed that all treatments prevented ovariectomy-induced macro structural bone loss in rats. PTH induced macro structural changes unrelated to ovariectomy. …
Optimization Of The Catalytic Performance Of Pd/Fe 3 O 4 Nanoparticles Prepared Via Microwave-Assisted Synthesis For Pharmaceutical And Catalysis Applications, Hany A. Elazab, Tamer T. El-Idreesy
Optimization Of The Catalytic Performance Of Pd/Fe 3 O 4 Nanoparticles Prepared Via Microwave-Assisted Synthesis For Pharmaceutical And Catalysis Applications, Hany A. Elazab, Tamer T. El-Idreesy
Chemical and Biochemical Engineering Faculty Research & Creative Works
Microwave assisted synthesis technique was used to prepare palladium supported on iron oxide nanoparticles. The advantage of using microwave irradiation as a synthetic tool is due to its unique features as a one step, simple, versatile, and rapid process. The reactants are added simply at room temperature without using high-temperature injection. Hydrazine hydrate was added by the following ratios (0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1, 1.6, and 3) ml to the different prepared samples at room temperature in order to investigate its effect on the catalytic performance of the prepared catalysts. The prepared catalyst could be used as an …
Exploring The Effects Of Electrospun Fiber Surface Nanotopography On Neurite Outgrowth And Branching In Neuron Cultures, Anthony R. D'Amato, Devan L. Puhl, Alexis M. Ziemba, Christopher D.L. Johnson, Janneke Doedee, Jonathan Bao, Ryan J. Gilbert
Exploring The Effects Of Electrospun Fiber Surface Nanotopography On Neurite Outgrowth And Branching In Neuron Cultures, Anthony R. D'Amato, Devan L. Puhl, Alexis M. Ziemba, Christopher D.L. Johnson, Janneke Doedee, Jonathan Bao, Ryan J. Gilbert
Chemical and Biochemical Engineering Faculty Research & Creative Works
Three aligned, electro spun fiber scaffolds with unique surface features were created from poly-L-lactic acid (PLLA). Fibers without surface nano topography (smooth fibers), fibers with surface divots (shallow pits), and fibers with surface pits (deeper pits) were fabricated, and fiber alignment, diameter, and density were characterized using scanning electron microscopy (SEM). Whole dorsal root ganglia (DRG) were isolated from rats and placed onto uncoated fibers or fibers coated with laminin. On uncoated fibers, neurite outgrowth was restricted by fibers displaying devoted or pitted nano topography when compared to neurite outgrowth on smooth fibers. However, neurites extending from whole DRG cultured …
Fluorine-Containing Oxidizers For Metal Fuels In Energetic Formulations, Siva Kumar Valluri, Mirko Schoenitz, Edward Dreizin
Fluorine-Containing Oxidizers For Metal Fuels In Energetic Formulations, Siva Kumar Valluri, Mirko Schoenitz, Edward Dreizin
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Fluorine containing oxidizers, primarily polymers, are extensively used in pyrotechnic compositions. Fluorinated oxidizers are less explored for metalized propellants and explosives despite a potential advantage of substantial heat release combined with gaseous combustion products. This review summarizes different types of fluorinated oxidizers used in energetic formulations or of potential interest for such systems, including gases, polymers, and inorganic compounds. Types of energetic formulations employing metals and fluoropolymers are discussed in more detail, including methods used to prepare composites and resulting salient features of the obtained materials. Laboratory experiments characterizing such materials, in particular, electron microscopy and thermal analysis, are discussed, …
Large-Strain Strength Of Polymer-Modified Kaolinite And Fly Ash-Kaolinite Mixtures, Xin Kang, Junnan Cao, Bate Bate
Large-Strain Strength Of Polymer-Modified Kaolinite And Fly Ash-Kaolinite Mixtures, Xin Kang, Junnan Cao, Bate Bate
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Polymers have gained gradual attention in soil stabilization as a sustainable alternative to inorganic counterparts such as cement. However, the effects of polymers on the strength of soils and soil-waste mixtures are still unclear. Meanwhile, waste recycling has been important in fostering a sustainable environment in recent decades. To solve the deficiency in knowledge, large-strain strength of polymer-modified kaolinite (KA) and Class-F fly ash-kaolinite mixtures (FAKAs) was investigated with isotropically consolidated undrained triaxial compression tests. Both synthetic polymer (polyethylene oxide, PEO) and naturally occurring biopolymers (chitosan and xanthan gum) were used. An interface model was also proposed to account for …
Recent Advances On Carrier And Exciton Self-Trapping In Strontium Titanate: Understanding The Luminescence Emissions, Miguel L. Crespillo, Joseph T. Graham, Fernando Agullo-Lopez, Yanwen Zhang, William J. Weber
Recent Advances On Carrier And Exciton Self-Trapping In Strontium Titanate: Understanding The Luminescence Emissions, Miguel L. Crespillo, Joseph T. Graham, Fernando Agullo-Lopez, Yanwen Zhang, William J. Weber
Nuclear Engineering and Radiation Science Faculty Research & Creative Works
An up-to-date review on recent results for self-trapping of free electrons and holes, as well as excitons, in strontium titanate (STO), which gives rise to small polarons and self-trapped excitons (STEs) is presented. Special attention is paid to the role of carrier and exciton self-trapping on the luminescence emissions under a variety of excitation sources with special emphasis on experiments with laser pulses and energetic ion-beams. In spite of the extensive research effort, a definitive identification of such localized states, as well as a suitable understanding of their operative light emission mechanisms, has remained lacking or controversial. However, promising advances …
Graphene Based Functional Devices: A Short Review, Rong Wang, Xin Gang Ren, Ze Yan, Li (Lijun) Jun Jiang, Wei E.I. Sha, Guang Cun Shan
Graphene Based Functional Devices: A Short Review, Rong Wang, Xin Gang Ren, Ze Yan, Li (Lijun) Jun Jiang, Wei E.I. Sha, Guang Cun Shan
Electrical and Computer Engineering Faculty Research & Creative Works
Graphene is an ideal 2D material system bridging electronic and photonic devices. It also breaks the fundamental speed and size limits by electronics and photonics, respectively. Graphene offers multiple functions of signal transmission, emission, modulation, and detection in a broad band, high speed, compact size, and low loss. Here, we have a brief view of graphene based functional devices at microwave, terahertz, and optical frequencies. Their fundamental physics and computational models were discussed as well.
A Framework For Process Inspection Of Metal Additive Manufacturing, Chih-Kun Cheng, Frank W. Liou, Yi-Chien Cheng, Sheng-Chih Shen
A Framework For Process Inspection Of Metal Additive Manufacturing, Chih-Kun Cheng, Frank W. Liou, Yi-Chien Cheng, Sheng-Chih Shen
Mechanical and Aerospace Engineering Faculty Research & Creative Works
In this paper, we propose a process inspection framework for metal additive manufacturing (AM) processes. AM, also known as 3D printing, is the process of joining materials to make objects on the basis of 3D model data and is envisioned to play a strategic role in maintaining economic and scientific dominance. Different from conventional manufacturing methods, the AM process is a point-by-point and layer-by-layer manufacturing. Thus, there are many opportunities to generate a process error that can cause quality issues in an AM part. A systematic AM process inspection is needed to yield acceptable performance of the part. The critical …
The Bridge Newsletter Spring 2019, Missouri University Of Science And Technology
The Bridge Newsletter Spring 2019, Missouri University Of Science And Technology
The Bridge Newsletter
-Building better aerogels
-Bridge repair needs
-Incoming ASCE President speaks
Control Upstream Austenite Grain Coarsening During Thin Slab Casting Direct Rolling (Tscdr) Process, Tihe Zhou, Ronald J. O'Malley, Hatem S. Zurob, Mani Subramanian, San-Hyun Cho, Peng Zhang
Control Upstream Austenite Grain Coarsening During Thin Slab Casting Direct Rolling (Tscdr) Process, Tihe Zhou, Ronald J. O'Malley, Hatem S. Zurob, Mani Subramanian, San-Hyun Cho, Peng Zhang
Materials Science and Engineering Faculty Research & Creative Works
Thin-slab cast direct-rolling (TSCDR) has become a major process for flat-rolled production. However, the elimination of slab reheating and limited number of thermomechanical deformation passes leave fewer opportunities for austenite grain refinement, resulting in some large grains persisting in the final microstructure. In order to achieve excellent ductile to brittle transition temperature (DBTT) and drop weight tear test (DWTT) properties in thicker gauge high-strength low-alloy products, it is necessary to control austenite grain coarsening prior to the onset of thermomechanical processing. This contribution proposes a suite of methods to refine the austenite grain from both theoretical and practical perspectives, including: …