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Articles 5611 - 5640 of 33693
Full-Text Articles in Entire DC Network
Quantitative Analysis Of The Impacts Of Out-Of-Sequence Work On Project Performance, Michael W. Ibrahim, Awad S. Hanna, Jeffrey S. Russell, Ibrahim S. Abotaleb, Islam H. El-Adaway
Quantitative Analysis Of The Impacts Of Out-Of-Sequence Work On Project Performance, Michael W. Ibrahim, Awad S. Hanna, Jeffrey S. Russell, Ibrahim S. Abotaleb, Islam H. El-Adaway
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Although out-of-sequence work (OOS) is often cited as a recurring challenge that impacts project performance, it has not been fully addressed in the existing literature as a standalone topic. This paper addresses this gap, defining OOS work as an activity or series of activities that was not performed according to baseline planned logical productive sequencing. By developing a project-based survey and contacting 300 professionals, extensive data were gathered from 42 projects. Using these data, the impacts of OOS were examined. It was found that, on average, approximately 15% of project activities are performed as OOS, resulting in 33% growth in …
Effects Of Clay Creep On Long-Term Load-Carrying Behaviors Of Bored Piles: Aiming At Reusing Existing Bored Piles, Lin Li, Weibing Gong, Jingpei Li, Jingpei Li
Effects Of Clay Creep On Long-Term Load-Carrying Behaviors Of Bored Piles: Aiming At Reusing Existing Bored Piles, Lin Li, Weibing Gong, Jingpei Li, Jingpei Li
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
An analytical procedure is presented for assessing the long-term load-carrying behavior of bored piles in clay, where the plastic volumetric strain of surrounding clay caused by creep is estimated by an advanced elasto-viscoplastic constitutive model. Two key soil parameters, the undrained shear strength and the shear modulus, which govern the load-carrying behavior of bored piles in clay, are determined from the definition of the quasi-over consolidation ratio and the concept of the critical state theory-based Cam-clay model. The long-term load-carrying capacity of bored piles is evaluated based on the total stress method. Hyperbolic load-transfer models are developed with proper incorporation …
Effect Of Calcination Time On The Physicochemical Properties And Photocatalytic Performance Of Carbon And Nitrogen Co-Doped Tio2 Nanoparticles, Emile Salomon Massima Mouele, Mihaela Dinu, Franscious Cummings, Ojo O. Fatoba, Myo Tay Zar Myint, Htet Htet Kyaw, Anca C. Parau, Alina Vladescu, M. Grazia Francesconi, Sara Pescetelli, Aldo Di Carlo, Antonio Agresti, Mohammed Al-Abri, Sergey Dobretsov, Mariana Braic, Leslie F. Petrik
Effect Of Calcination Time On The Physicochemical Properties And Photocatalytic Performance Of Carbon And Nitrogen Co-Doped Tio2 Nanoparticles, Emile Salomon Massima Mouele, Mihaela Dinu, Franscious Cummings, Ojo O. Fatoba, Myo Tay Zar Myint, Htet Htet Kyaw, Anca C. Parau, Alina Vladescu, M. Grazia Francesconi, Sara Pescetelli, Aldo Di Carlo, Antonio Agresti, Mohammed Al-Abri, Sergey Dobretsov, Mariana Braic, Leslie F. Petrik
Mining Engineering Faculty Research & Creative Works
The application of highly active nano catalysts in advanced oxidation processes (AOPs) improves the production of non-selective hydroxyl radicals and co-oxidants for complete remediation of polluted water. This study focused on the synthesis and characterization of a highly active visible light C–N-co-doped TiO2 nano catalyst that we prepared via the sol-gel method and pyrolyzed at 350 °C for 105 min in an inert atmosphere to prevent combustion of carbon moieties. Then we prolonged the pyrolysis holding time to 120 and 135 min and studied the effect of these changes on the crystal structure, particle size and morphology, electronic properties and …
Evaluating The Crosstalk Current And The Total Radiated Power Of A Bent Cable Harness Using The Generalized Mtl Method, Yansheng Wang, Ying S. Cao, Dazhao Liu, Richard W. Kautz, Nevin Altunyurt, Jun Fan
Evaluating The Crosstalk Current And The Total Radiated Power Of A Bent Cable Harness Using The Generalized Mtl Method, Yansheng Wang, Ying S. Cao, Dazhao Liu, Richard W. Kautz, Nevin Altunyurt, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
This paper presents a general formulation of the generalized multiconductor transmission line (GMTL) method to model a parallel cable harness including straight and bent wires. The parallel cable harness here indicates the uniform cross-sectional wire distribution. The GMTL equations are solved recursively based on the perturbation theory. This GMTL method facilitates an accurate evaluation of the current distributed on a cable harness. On top of that, the current obtained in a radiation problem is decomposed into two traveling currents, i.e., the positive-going and the negative-going currents, based on the least-squares method. With the decomposed currents, the steepest descent method is …
The Kinetic Study Of Dpt Using Mathematica As An Efficient Optimization Tool, M. H. El Dewaik, Mamdouh Gadalla, M. A. Radwan, M. A. Sadek, Hany A. Elazab
The Kinetic Study Of Dpt Using Mathematica As An Efficient Optimization Tool, M. H. El Dewaik, Mamdouh Gadalla, M. A. Radwan, M. A. Sadek, Hany A. Elazab
Chemical and Biochemical Engineering Faculty Research & Creative Works
Mathematica is a powerful program for computing both numeric and algebraic calculations as well as graphing two- and three-dimensional curves and surfaces. It is used increasingly in many fields of science now such as physics, engineering, chemistry and even biology because of the fast interaction of mathematics with almost the fields of science nowadays. Synthesis of Cyclotetramethylene Tetramine through the action of nitrating mixture formed of ammonium nitrate and fuming nitric acid on hexamine in presence of acetic acid, acetic anhydride and p-formaldehyde has been proven. The pathway is relatively long and Hexamine Dinitrate and Dinitro Pentamethylene Tetramine (DPT) are …
Laser Metal Deposition Of An Alcocrfeniti₀.₅ High-Entropy Alloy Coating On A Ti6al4v Substrate: Microstructure And Oxidation Behavior, Wenyuan Cui, Wei Li, Wei Ting Chen, Frank W. Liou
Laser Metal Deposition Of An Alcocrfeniti₀.₅ High-Entropy Alloy Coating On A Ti6al4v Substrate: Microstructure And Oxidation Behavior, Wenyuan Cui, Wei Li, Wei Ting Chen, Frank W. Liou
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Ti6Al4V has been recognized as an attractive material, due to its combination of low density and favorable mechanical properties. However, its insufficient oxidation resistance has limited the high-temperature application. In this work, an AlCoCrFeNiTi0.5 high-entropy alloy (HEA) coating was fabricated on a Ti6Al4V substrate using laser metal deposition (LMD). The microstructure and isothermal oxidation behaviors were investigated. The microstructure of as-deposited HEA exhibited a Fe, Cr-rich A2 phase and an Al, Ni, Ti-enriched B2 phase. Its hardness was approximately 2.1 times higher than that of the substrate. The oxidation testing at 700⁰C and 800⁰C suggested that the HEA coating …
A Review On Metallic Alloys Fabrication Using Elemental Powder Blends By Laser Powder Directed Energy Deposition Process, Yitao Chen, Xinchang Zhang, Mohammad Masud Parvez, Frank W. Liou
A Review On Metallic Alloys Fabrication Using Elemental Powder Blends By Laser Powder Directed Energy Deposition Process, Yitao Chen, Xinchang Zhang, Mohammad Masud Parvez, Frank W. Liou
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The laser powder directed energy deposition process is a metal additive manufacturing technique, which can fabricate metal parts with high geometric and material flexibility. The unique feature of in-situ powder feeding makes it possible to customize the elemental composition using elemental powder mixture during the fabrication process. Thus, it can be potentially applied to synthesize industrial alloys with low cost, modify alloys with different powder mixtures, and design novel alloys with location-dependent properties using elemental powder blends as feedstocks. This paper provides an overview of using a laser powder directed energy deposition method to fabricate various types of alloys by …
Lateral Migration Of A Ferrofluid Droplet In A Plane Poiseuille Flow Under Uniform Magnetic Fields, Md Rifat Hassan, Cheng Wang
Lateral Migration Of A Ferrofluid Droplet In A Plane Poiseuille Flow Under Uniform Magnetic Fields, Md Rifat Hassan, Cheng Wang
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The lateral migration of a two-dimensional (2D) viscous ferrofluid droplet in a plane Poiseuille flow under a uniform magnetic field is studied numerically by using the level set method. Focusing on low droplet Reynolds number flows (Red ≤ 0.05), several numerical simulations are carried out to analyze the effects of magnetic field direction and strength, droplet size, and viscosity ratio on the lateral migration behavior of the droplet. The results indicate that the magnetic field direction plays a pivotal role in the trajectory of lateral migration of the droplet and the final equilibrium position in the channel. When the …
Improved Ballistic Limit Equations For High-Speed Non-Aluminum Projectiles Impacting Aluminum Dual-Wall Spacecraft Systems, William P. Schonberg
Improved Ballistic Limit Equations For High-Speed Non-Aluminum Projectiles Impacting Aluminum Dual-Wall Spacecraft Systems, William P. Schonberg
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
One of the major design considerations of earth-orbiting spacecraft is the damage that might occur from an impact by a micrometeoroid or orbital debris particle. Ballistic limit equations (BLEs), which predict the response of spacecraft components under impact, are one of the key components of any micrometeoroid / orbital debris risk assessment calculation. However, given that a limited number of BLEs have been developed, analysts will sometimes use a BLE to assess the impact projectile made of a material that was not used in the development of that BLE. This paper presents the results of a two-part study that focused …
Observation And Analysis Of Multiple Dark-Antidark Solitons In Two-Component Bose-Einstein Condensates, Garyfallia Katsimiga, Simeon I. Mistakidis, T. M. Bersano, M. K.H. Ome, S. M. Mossman, K. Mukherjee, P. Schmelcher, P. Engels, P. G. Kevrekidis
Observation And Analysis Of Multiple Dark-Antidark Solitons In Two-Component Bose-Einstein Condensates, Garyfallia Katsimiga, Simeon I. Mistakidis, T. M. Bersano, M. K.H. Ome, S. M. Mossman, K. Mukherjee, P. Schmelcher, P. Engels, P. G. Kevrekidis
Physics Faculty Research & Creative Works
We Report On The Static And Dynamical Properties Of Multiple Dark-Antidark Solitons (DADs) In Two-Component, Repulsively Interacting Bose-Einstein Condensates. Motivated By Experimental Observations Involving Multiple DADs, We Present A Theoretical Study Which Showcases That Bound States Consisting Of Dark (Antidark) Solitons In The First (Second) Component Of The Mixture Exist For Different Values Of Interspecies Interactions. It Is Found That Ensembles Of Few DADs May Exist As Stable Configurations, While For Larger DAD Arrays, The Relevant Windows Of Stability With Respect To The Interspecies Interaction Strength Become Progressively Narrower. Moreover, The Dynamical Formation Of States Consisting Of Alternating DADs In …
Mismatch In Ebg Common-Mode Filters Implemented On Pcbs, Marina Y. Koledintseva, Sergiu Radu, Joseph Nuebel
Mismatch In Ebg Common-Mode Filters Implemented On Pcbs, Marina Y. Koledintseva, Sergiu Radu, Joseph Nuebel
Electrical and Computer Engineering Faculty Research & Creative Works
In this article, impedance mismatch effects on the characteristics of common-mode (CM) electromagnetic bandgap (EBG) filters are studied using three-dimensional (3-D) full-wave numerical simulations. The CM EBG filters considered herein are designed using standard printed circuit board technology and contain either microstrip (MS) differential pairs running above the EBG plane, or strip line (SL) differential pairs running on one of the layers next to the EBG plane. First, the terminations are fixed at 50 Ω, and the effects of the differential line impedance variations on the EBG filter parameters are studied. Overall, the considered variations in the widths of the …
Measurement Techniques To Identify Soft Failure Sensitivity To Esd, Jianchi Zhou, Yuandong Guo, Satyajeet Shinde, Ahmad Hosseinbeig, Abhishek Patnaik, Omid Hoseini Izadi, Chen Zeng, Jun Shi, Junji Maeshima, Hideki Shumiya, Kenji Araki, David Pommerenke
Measurement Techniques To Identify Soft Failure Sensitivity To Esd, Jianchi Zhou, Yuandong Guo, Satyajeet Shinde, Ahmad Hosseinbeig, Abhishek Patnaik, Omid Hoseini Izadi, Chen Zeng, Jun Shi, Junji Maeshima, Hideki Shumiya, Kenji Araki, David Pommerenke
Electrical and Computer Engineering Faculty Research & Creative Works
Electrostatic discharge (ESD)-induced soft failures are a critical issue for electronic systems as the failures are mostly found after the hardware design is completed. Any changes applied to the hardware may delay the project. Diagnostic tools capable of identifying soft failure-induced malfunctions in an early stage of product design help to reduce the risk of late stage ESD-induced project delays. In many cases, soft failures can be directly observed by the user interface, system crash, or other obvious indicators. However, in an early product design stage the operation system may be marginal, and applications may not be available. To improve …
Automated Detection And Characterization Of Esd-Induced Soft Failures Using Image-And Audio-Based Methods, Omid Hoseini Izadi, Javad Meiguni, Kenji Araki, Hideki Shumiya, David J. Pommerenke
Automated Detection And Characterization Of Esd-Induced Soft Failures Using Image-And Audio-Based Methods, Omid Hoseini Izadi, Javad Meiguni, Kenji Araki, Hideki Shumiya, David J. Pommerenke
Electrical and Computer Engineering Faculty Research & Creative Works
Audio-and image-based soft failure detection methods are developed, which can detect both severe failures (such as system hang) and subtle ones (such as glitch or a momentary disturbance on display). Incorporating the developed detection methods with a robotic ESD (electrostatic discharge) tester, we developed a fully automated soft failure investigation tool. Using this fully automated tool, we obtained failure-specific susceptibility maps for a camera (our target device). These susceptibility maps not only illustrated the sensitive locations of the device, but they also showed what type of soft failure is correlated with which locations.
On The Effect Of Interfacial Patterns On Energy Dissipation In Plastically Deforming Adhesive Bonded Ductile Sheets, Arturo Pascuzzo, Arief Yudhanto, Marco Alfano, Gilles Lubineau
On The Effect Of Interfacial Patterns On Energy Dissipation In Plastically Deforming Adhesive Bonded Ductile Sheets, Arturo Pascuzzo, Arief Yudhanto, Marco Alfano, Gilles Lubineau
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Toughening of brittle adhesive joints is a topic of great interest for the fabrication of layered structures. Recent experimental work by the authors indicated that spatially varying interface properties (i.e., patterned interfaces obtained using laser irradiation) could tune energy dissipation in plastically deforming adhesive joints. In this study, we use a cohesive zone approach to ascertain the interplay between fracture process zone size and pattern geometry on the overall work of separation. The analysis is carried out in the context of the elasto-plastic peeling response of adhesive bonded ductile thin sheets. The mating surfaces of the adherents feature alternating strips …
A Novel Data-Driven Analysis Method For Electromagnetic Radiations Based On Dynamic Mode Decomposition, Yanming Zhang, Lijun Jiang
A Novel Data-Driven Analysis Method For Electromagnetic Radiations Based On Dynamic Mode Decomposition, Yanming Zhang, Lijun Jiang
Electrical and Computer Engineering Faculty Research & Creative Works
Electromagnetic radiations in complex electronic systems such as cell phones and computers are complex spatial oral correlations signals. Decomposing the electromagnetic radiation measured in the spatial oral domain is useful to gain physical insights into the process that generates radio frequency interference and the radiated spurious emission. In this article, a novel data-driven characterization method is proposed to analyze the electromagnetic radiations of both linear and nonlinear circuits. It employs the dynamic mode decomposition to simultaneously extract the temporal patterns and their corresponding dynamic modes. The temporal patterns show high-order harmonics generated by the nonlinearity. Then, these spatial oral coherent …
Doping A Lattice-Trapped Bosonic Species With Impurities: From Ground State Properties To Correlated Tunneling Dynamics, Kevin Keiler, Simeon I. Mistakidis, Peter Schmelcher
Doping A Lattice-Trapped Bosonic Species With Impurities: From Ground State Properties To Correlated Tunneling Dynamics, Kevin Keiler, Simeon I. Mistakidis, Peter Schmelcher
Physics Faculty Research & Creative Works
We Investigate The Ground State Properties And The Nonequilibrium Dynamics Of A Lattice Trapped Bosonic Mixture Consisting Of An Impurity Species And A Finite-Sized Medium. For The Case Of One As Well As Two Impurities We Observe That, Depending On The Lattice Depth And The Interspecies Interaction Strength, A Transition From A Strongly Delocalized To A Localized Impurity Distribution Occurs. In The Latter Regime The Two Species Phase Separate, Thereby Forming A Particle-Hole Pair. For Two Impurities We Find That Below A Critical Lattice Depth They Are Delocalized Among Two Neighboring Outer Lattice Wells And Are Two-Body Correlated. This Transition …
Cable Harness Modeling Using Mtl Parameters Derived From Integral Equations, Muqi Ouyang, Xu Wang, Nevin Altunyurt, Varittha Sanphuang, Nitin Parsa, Jun Fan
Cable Harness Modeling Using Mtl Parameters Derived From Integral Equations, Muqi Ouyang, Xu Wang, Nevin Altunyurt, Varittha Sanphuang, Nitin Parsa, Jun Fan
Electrical and Computer Engineering Faculty Research & Creative Works
A method to calculate equivalent Multiconductor Transmission-Line (MTL) parameters through integral equations is proposed in this paper. In the mixed-potential integral equations (MPIE), the elements of harness part are converted to MTL parameters based on the relations between MTL parameters and partial elements of 1-D wire segments. Then, to include the effects of reference metal plane nearby, the equivalent MTL parameters can be derived from the MPIE equations with modified harness elements by keeping the solutions on harness part the same. The current distributions on wires calculated using the equivalent MTL parameters have good correlations with the results from the …
Calibration Loop Antenna For Multiple Probe Antenna Measurement System, Yuming Zheng, Zibin Weng, Yihong Qi, Jun Fan, Fuhai Li, Zhiping Yang, James L. Drewniak
Calibration Loop Antenna For Multiple Probe Antenna Measurement System, Yuming Zheng, Zibin Weng, Yihong Qi, Jun Fan, Fuhai Li, Zhiping Yang, James L. Drewniak
Electrical and Computer Engineering Faculty Research & Creative Works
In order to achieve high accuracy in measurements of the multiple probe antenna measurement system (MPAMS), an omnidirectional calibration antenna with a small gain variation in the horizontal polarization (named calibration loop antenna, in convention) is required. This article presents such an antenna design. The proposed calibration loop antenna consists of four arc-folded dipoles with dimensions of 52 mm x52 mm x 1 mm, balun structures for suppressing common mode current, and four parasitic strips for impedance matching on each of the top and bottom planes. The experimental results show that the proposed calibration loop antenna has a small gain …
Total Isotropic Sensitivity Measurement In Switched Beam Antenna Systems, Jun Li, Yihong Qi, Wei Yu, Fuhai Li, Jun Fan, Zhiping Yang, Songping Wu, James L. Drewniak
Total Isotropic Sensitivity Measurement In Switched Beam Antenna Systems, Jun Li, Yihong Qi, Wei Yu, Fuhai Li, Jun Fan, Zhiping Yang, Songping Wu, James L. Drewniak
Electrical and Computer Engineering Faculty Research & Creative Works
Smart antenna systems (SAS) play an important role in wireless communication systems, especially in rapidly developing fifth generation (5G) systems. In normal device under test (DUT) applications with SAS, the antenna's state may change in different external environments in order to obtain higher antenna gains and better connection with the base station, resulting in high uncertainties for over-the-air (OTA) tests using conventional methods. Before evaluating the transceiver performance, additional application programs are necessary to control the DUT, which increases the inconvenience for engineers and makes it impossible to reflect the real usage scenario. This article proposes a new convenient method …
Physics-Based Circuit Modeling Methodology For System Power Integrity Analysis And Design, Biyao Zhao, Siqi Bai, Samuel Connor, Wiren Dale Becker, Matteo Cocchini, Jonghyun Cho, Albert E. Ruehli, Bruce Archambeault, James L. Drewniak
Physics-Based Circuit Modeling Methodology For System Power Integrity Analysis And Design, Biyao Zhao, Siqi Bai, Samuel Connor, Wiren Dale Becker, Matteo Cocchini, Jonghyun Cho, Albert E. Ruehli, Bruce Archambeault, James L. Drewniak
Electrical and Computer Engineering Faculty Research & Creative Works
A physics-based circuit modeling methodology for system-level power integrity (PI) analysis and design is presented herein. The modeling methodology is based on representing the current paths in the power distribution network (PDN) with appropriate circuits based on cavity model and plane-pair partial element equivalent circuit (PEEC). The PDN input impedance looking from on-chip sources can be computed. A commercial simulation tool is used to corroborate the modeling approach where the system consists of a commercial integrated circuit, a complex organic package and a very high-layer-count printed circuit board. Two types of circuit models are proposed from the methodology with physical …
Hierarchical Syntactic Models For Human Activity Recognition Through Mobility Traces, Enrico Casella, Marco Ortolani, Simone Silvestri, Sajal K. Das
Hierarchical Syntactic Models For Human Activity Recognition Through Mobility Traces, Enrico Casella, Marco Ortolani, Simone Silvestri, Sajal K. Das
Computer Science Faculty Research & Creative Works
Recognizing users’ daily life activities without disrupting their lifestyle is a key functionality to enable a broad variety of advanced services for a Smart City, from energy-efficient management of urban spaces to mobility optimization. In this paper, we propose a novel method for human activity recognition from a collection of outdoor mobility traces acquired through wearable devices. Our method exploits the regularities naturally present in human mobility patterns to construct syntactic models in the form of finite state automata, thanks to an approach known as grammatical inference. We also introduce a measure of similarity that accounts for the intrinsic hierarchical …
Effect Of Vortex-Induced Physical Stress On Fluorescent Properties Of Dye-Containing Poly(Ethylene Glycol)-Block-Poly(Lactic Acid) Micelles, Tyler L. Odom, Jacob R. Blankenship, Giselle Campos, Devin C. Mart, Wenyan Liu, Risheng Wang, Keiichi Yoshimatsu
Effect Of Vortex-Induced Physical Stress On Fluorescent Properties Of Dye-Containing Poly(Ethylene Glycol)-Block-Poly(Lactic Acid) Micelles, Tyler L. Odom, Jacob R. Blankenship, Giselle Campos, Devin C. Mart, Wenyan Liu, Risheng Wang, Keiichi Yoshimatsu
Chemistry Faculty Research & Creative Works
The effect of vortex-induced mechanical stresses on the fluorescent properties of dye-containing poly(ethylene glycol)-block-poly(lactic acid) (PEG-b-PLA) block copolymer micelles has been investigated. PEG-b-PLA block copolymer micelles containing fluorescent dyes, 3,3′-dioctadecyloxacarbocyanine perchlorate (DiO) and/or 1,1′-dioctadecyl-3,3,3′,3′-tetramethylindocarbocyanine perchlorate (DiI), are prepared by a simple one-step procedure that involves the self-assembly of block copolymers and spontaneous incorporation of hydrophobic dyes into the core of the micelles. Upon vortexing, the micelle dispersion samples showed a decrease in fluorescence intensity in a rotational speed- and time-dependent manner. The results demonstrated that the vortexing can alter the fluorescent properties of the dye-containing PEG-b-PLA block copolymer micelle dispersion …
Postharvest Application Of Thiol Compounds Affects Surface Browning And Antioxidant Activity Of Fresh-Cut Potatoes, İnci Cerit, Annalise Pfaff, Nuran Ercal, Omca Demirkol
Postharvest Application Of Thiol Compounds Affects Surface Browning And Antioxidant Activity Of Fresh-Cut Potatoes, İnci Cerit, Annalise Pfaff, Nuran Ercal, Omca Demirkol
Chemistry Faculty Research & Creative Works
The aim of this study was to compare the effects of sodium metabisulphite and the thiol compounds, glutathione (GSH), L-cysteine (CYS), and N-acetylcysteine (NAC), on the enzymatic browning, antioxidant activities, total phenolic, and ascorbic acid content of potatoes after 1, 24, and 48 hr. Three different concentrations (0.5%, 1.0%, and 2.0%) of each thiol compound were tested. While sulphite solution inhibited polyphenol oxidase as expected, NAC and CYS also decreased its activity. CYS-treated samples exhibited the highest residual thiol content, while the amount of residual thiol in GSH-treated samples was the lowest. The 2.0% NAC and 2.0% CYS solutions were …
A Mechanism Of Electric Charge Losses In Adiabatically Compressed Ferroelectrics, Sergey I. Shkuratov, Jason Baird, Vladimir G. Antipov, Jay B. Chase
A Mechanism Of Electric Charge Losses In Adiabatically Compressed Ferroelectrics, Sergey I. Shkuratov, Jason Baird, Vladimir G. Antipov, Jay B. Chase
Mining Engineering Faculty Research & Creative Works
A ferroelectric depolarized by high strain-rates induced by the passage of adiabatic shock waves releases a high-density electric charge, initiating the generation of high voltage and megawatt power levels. Additionally, this depolarization process alters physical and mechanical properties that might cause energy and electric charge losses in the ferroelectric materials. We report, herein, the results of an experimental study of electric charge losses in Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 and Pb0.99(Zr0.52Ti0.48)0.99Nb0.01O3 ferroelectrics subjected to shock compression. We found that electric charge losses mainly occur in the compressed zone of ferroelectric elements, i.e., shock compression is an essential part of the charge loss mechanism. Based …
Transceivers As A Resource: Scheduling Time And Bandwidth In Software-Defined Radio, Nathan D. Price, Maciej Jan Zawodniok, Ivan G. Guardiola
Transceivers As A Resource: Scheduling Time And Bandwidth In Software-Defined Radio, Nathan D. Price, Maciej Jan Zawodniok, Ivan G. Guardiola
Electrical and Computer Engineering Faculty Research & Creative Works
In the future, software-defined radio may enable a mobile device to support multiple wireless protocols implemented as software applications. These applications, often referred to as waveform applications, could be added, updated, or removed from a software-radio device to meet changing demands. Current software-defined radio solutions grant an active waveform exclusive ownership of a specific transceiver or analog front-end. Since a wireless device has a limited number of front-ends, this approach puts a hard constraint on the number of concurrent waveform applications a device can support. A growing trend in software-defined radio research is to virtualize front-ends to allow sharing and …
Robust Control Of The Minima Of High-Order Harmonics By Fine-Tuning The Alignment Of Co₂ Molecules For Shaping Attosecond Pulses And Probing Molecular Alignment, Cheng Jin, Su Ju Wang, Song Feng Zhao, Anh-Thu Le, C. D. Lin
Robust Control Of The Minima Of High-Order Harmonics By Fine-Tuning The Alignment Of Co₂ Molecules For Shaping Attosecond Pulses And Probing Molecular Alignment, Cheng Jin, Su Ju Wang, Song Feng Zhao, Anh-Thu Le, C. D. Lin
Physics Faculty Research & Creative Works
In a recent paper [C. Jin, S.-J. Wang, X. Zhao, S.-F. Zhao, and C. D. Lin, Phys. Rev. A 101, 013429 (2020)2469-992610.1103/PhysRevA.101.013429], we reported that the position and depth of the minima in the harmonic spectra of CO2 molecules can be dramatically manipulated by a slight change of the degree of alignment, thus providing a convenient method of shaping attosecond pulses which could lead to the splitting of a typical single attosecond burst into two. Here, we demonstrate that harmonic minima can also be dramatically controlled by changing the pump-probe angles to shape attosecond pulses. In the meanwhile, since …
On The Noisy Gradient Descent That Generalizes As Sgd, Jingfeng Wu, Wenqing Hu, Haoyi Xiong, Jun Huan, Vladimir Braverman, Zhanxing Zhu
On The Noisy Gradient Descent That Generalizes As Sgd, Jingfeng Wu, Wenqing Hu, Haoyi Xiong, Jun Huan, Vladimir Braverman, Zhanxing Zhu
Mathematics and Statistics Faculty Research & Creative Works
The gradient noise of SGD is considered to play a central role in the observed strong generalization abilities of deep learning. While past studies confirm that the magnitude and covariance structure of gradient noise are critical for regularization, it remains unclear whether or not the class of noise distributions is important. In this work we provide negative results by showing that noises in classes different from the SGD noise can also effectively regularize gradient descent. Our finding is based on a novel observation on the structure of the SGD noise: it is the multiplication of the gradient matrix and a …
Role Of Fluid Injection On Earthquake Size In Dynamic Rupture Simulations On Rough Faults, Jeremy Maurer, Eric M. Dunham, Paul Segall
Role Of Fluid Injection On Earthquake Size In Dynamic Rupture Simulations On Rough Faults, Jeremy Maurer, Eric M. Dunham, Paul Segall
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
An outstanding question for induced seismicity is whether the volume of injected fluid and/or the spatial extent of the resulting pore pressure and stress perturbations limit rupture size. We simulate ruptures with and without injection‐induced pore pressure perturbations, using 2‐D dynamic rupture simulations on rough faults. Ruptures are not necessarily limited by pressure perturbations when (1) background shear stress is above a critical value, or (2) pore pressure is high. Both conditions depend on fault roughness. Stress heterogeneity from fault roughness primarily determines where ruptures stop; pore pressure has a secondary effect. Ruptures may be limited by fluid volume or …
Investigation Of Honey Thin Film As A Resistive Switching Material For Nonvolatile Memories, Aleksey A. Sivkov, Yuan Xing, Kuan Yew Cheong, Xiangqun Zeng, Feng Zhao
Investigation Of Honey Thin Film As A Resistive Switching Material For Nonvolatile Memories, Aleksey A. Sivkov, Yuan Xing, Kuan Yew Cheong, Xiangqun Zeng, Feng Zhao
Electrical and Computer Engineering Faculty Research & Creative Works
In this paper, we report, for the first time, honey thin film as a resistive switching material and its memory behaviors. A dried honey film was sandwiched in between a CuxO bottom electrode and a Cu top electrode to form a metal-insulator-metal structure on a glass substrate. Current-voltage measurements showed that the device exhibited bipolar switching characteristics with Ohmic conduction behavior and a read memory window of 2.6 V. When biased at a read voltage of 0.2 V, the data retention time is over an interval of 104 s and ON/OFF ratio is in the order of 107 …
Synthesis And Characterization Of Free-Stand Graphene/Silver Nanowire/Graphene Nano Composite As Transparent Conductive Film With Enhanced Stiffness, Chuanrui Guo, Yanxiao Li, Yanping Zhu, Chenglin Wu, Genda Chen
Synthesis And Characterization Of Free-Stand Graphene/Silver Nanowire/Graphene Nano Composite As Transparent Conductive Film With Enhanced Stiffness, Chuanrui Guo, Yanxiao Li, Yanping Zhu, Chenglin Wu, Genda Chen
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
As-grown graphene via chemical vapor deposition (CVD) has potential defects, cracks, and disordered grain boundaries induced by the synthesis and transfer process. Graphene/silver nanowire/graphene (Gr/AgNW/Gr) sandwich composite has been proposed to overcome these drawbacks significantly as the AgNW network can provide extra connections on graphene layers to enhance the stiffness and electrical conductivity. However, the existing substrate (polyethylene terephthalate (PET), glass, silicon, and so on) for composite production limits its application and mechanics behavior study. In this work, a vacuum annealing method is proposed and validated to synthesize the free-stand Gr/AgNW/Gr nanocomposite film on transmission electron microscopy (TEM) grids. AgNW …