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Articles 1 - 30 of 86
Full-Text Articles in Engineering
Magnetic Transitions In Disordered Gdal2, D. Williams, Paul Shand, Thomas Pekarek, Ralph Skomski, Valeri Petkov, Diandra Leslie-Pelecky
Magnetic Transitions In Disordered Gdal2, D. Williams, Paul Shand, Thomas Pekarek, Ralph Skomski, Valeri Petkov, Diandra Leslie-Pelecky
Thomas M. Pekarek
The role of disorder in magnetic ordering transitions is investigated using mechanically milled GdAl2. Crystalline GdAl2 is a ferromagnet while amorphous GdAl2 is a spin glass. Nanostructured GdAl2 shows a paramagnetic-to-ferromagnetic transition and glassy behavior, with the temperature and magnitude of each transition dependent on the degree and type of disorder. Disorder is parametrized by a Gaussian distribution of Curie temperatures TC with mean TC and breadth Δ TC. A nonzero coercivity is observed at temperatures more than 20 K above the highest TC of any known Gd-Al phase; however, the coercivity decreases with decreasing temperature over the same temperature …
Getting To The Root Of Bacterial Hairs: What Is “S”?, Rebecca Gaddis, Samantha O'Conner, Evan Anderson, Terri Camesano, Nancy Burnham
Getting To The Root Of Bacterial Hairs: What Is “S”?, Rebecca Gaddis, Samantha O'Conner, Evan Anderson, Terri Camesano, Nancy Burnham
Nancy A. Burnham
An atomic force microscope (AFM) was used to measure the steric forces of lipopolysaccharides (LPS) on the biofilm-forming bacteria, Pseudomonas aeruginosa. It is well known that LPS play a vital role in biofilm formation. These forces were characterized with a modified version of the Alexander and de Gennes (AdG) model for polymers, which is a function of equilibrium brush length, L, probe radius, R, temperature, T, separation distance, D, and an indefinite density variable, s. This last parameter was originally distinguished by de Gennes as the root spacing or mesh spacing depending upon the type of polymer adhesion; however since …
Disorder-Induced Depression Of The Curie Temperature In Mechanically Milled Gdal2, Marco Morales Torres, D. Williams, Paul Shand, C. Stark, Thomas Pekarek, L. Yue, Valeri Petkov, Diandra Leslie-Pelecky
Disorder-Induced Depression Of The Curie Temperature In Mechanically Milled Gdal2, Marco Morales Torres, D. Williams, Paul Shand, C. Stark, Thomas Pekarek, L. Yue, Valeri Petkov, Diandra Leslie-Pelecky
Thomas M. Pekarek
The effect of disorder on the ferromagnetic transition is investigated in mechanically milled GdAl2. GdAl2is a ferromagnet when crystalline and a spin glass when amorphous. Mechanical milling progressively disorders the alloy, allowing observation of the change from ferromagnetic to a disordered magnetic state. X-ray diffraction and pair-distribution-function analysis are used to determine the grain size, lattice parameter, and mean-squared atomic displacements. The magnetization as a function of temperature is described by a Gaussian distribution of Curie temperatures. The mean Curie temperature decreases with decreasing lattice parameter, where lattice parameter serves as a measure of defect concentration. Two different rates of …
A Simplified Approach For Negative Skin Friction Calculation Of Special-Shaped Pile Considering Pile-Soil Interaction Under Surcharge, Gang-Qiang Kong, Hang Zhou, Han-Long Liu, Xuan-Ming Ding, Robert Liang
A Simplified Approach For Negative Skin Friction Calculation Of Special-Shaped Pile Considering Pile-Soil Interaction Under Surcharge, Gang-Qiang Kong, Hang Zhou, Han-Long Liu, Xuan-Ming Ding, Robert Liang
Robert Y. Liang
A simplified approach was proposed to analyze the negative skin friction calculation of special-shaped pile considering pile-soil interaction under surcharge. Based on the concentric cylinder shearing theory, considering the changes of pile shape (such as, taper angle and diameters of pile base, etc.), the load-transfer of special-shaped pile was built. The accuracy of the developed simplified approach was verified by numerical simulation model with the same condition. Then, the influence factors, such as, taper angles, the diameter of pile base, surcharge, and pile-soil interface parameters were analyzed and discussed. The results show that the developed simplified approach can calculate NSF …
Three-Dimensional Confocal Microscopy Indentation Method For Hydrogel Elasticity Measurement, Donghee Lee, Md Mahmudur Rahman, You Zhou, Sangjin Ryu
Three-Dimensional Confocal Microscopy Indentation Method For Hydrogel Elasticity Measurement, Donghee Lee, Md Mahmudur Rahman, You Zhou, Sangjin Ryu
Md Mahmudur Rahman
No abstract provided.
Room Temperature Ferromagnetism In Iron Doped Zinc Oxide Nanoparticles, Lydia Johnson
Room Temperature Ferromagnetism In Iron Doped Zinc Oxide Nanoparticles, Lydia Johnson
Lydia Johnson
The purpose of this work was to investigate the impact of crystallite size, surface properties, and transition metal dopants on the magnetic behavior of zinc oxide nanoparticles. To accomplish this, three experimental factors were independently controlled: undoped zinc oxide particle size, reaction solvent, and transition metal dopant concentration. Powders of nanocrystalline Zn1-xFexO were chemically synthesized via two similar hydrolysis methods (solvent either diethylene glycol or ethanol), with dopant concentrations varying from x = 0 to x = 0.10 and the undoped (x = 0) samples synthesized in a range of sizes between 4 - 20 …
Characterizing Non-Zeolitic Pore Volume In Zeolite Membranes By Temperature-Programmed Desorption, Miao Yu, J. Falconer, R. Noble
Characterizing Non-Zeolitic Pore Volume In Zeolite Membranes By Temperature-Programmed Desorption, Miao Yu, J. Falconer, R. Noble
Miao Yu
No abstract provided.
2,2-Dimethylbutane Adsorption And Diffusion In Mfi Zeolite, Miao Yu, J. Wyss, R. Noble, J. Falconer
2,2-Dimethylbutane Adsorption And Diffusion In Mfi Zeolite, Miao Yu, J. Wyss, R. Noble, J. Falconer
Miao Yu
No abstract provided.
Reversible H2 Storage Using A Sapo-34 Zeolite Layer, Miao Yu
Reversible H2 Storage Using A Sapo-34 Zeolite Layer, Miao Yu
Miao Yu
No abstract provided.
Ultrafiltration Membranes With Structure-Optimized Graphene-Oxide Coatings For Antifouling Oil/Water Separation, Y. Huang, H. Li, Lei Wang, Yali Qiao, Chuanbing Tang, Chanil Jung, Yeomin Yoon, S. Li, Miao Yu
Ultrafiltration Membranes With Structure-Optimized Graphene-Oxide Coatings For Antifouling Oil/Water Separation, Y. Huang, H. Li, Lei Wang, Yali Qiao, Chuanbing Tang, Chanil Jung, Yeomin Yoon, S. Li, Miao Yu
Miao Yu
No abstract provided.
Obtaining Mixed Ionic/Electronic Conductivity In Perovskite Oxides In A Reducing Environment: A Computational Prediction For Doped Srtio3, S. Suthirakun, Salai Ammal, G. Xiao, Fanglin Chen, Kevin Huang, Hans-Conrad Zur Loye, Andreas Heyden
Obtaining Mixed Ionic/Electronic Conductivity In Perovskite Oxides In A Reducing Environment: A Computational Prediction For Doped Srtio3, S. Suthirakun, Salai Ammal, G. Xiao, Fanglin Chen, Kevin Huang, Hans-Conrad Zur Loye, Andreas Heyden
Salai C. Ammal
No abstract provided.
Integrated Computational Chemistry System For Catalysts Design, Salai Ammal, S. Takami, M. Kubo, A. Miyamoto
Integrated Computational Chemistry System For Catalysts Design, Salai Ammal, S. Takami, M. Kubo, A. Miyamoto
Salai C. Ammal
The understanding of valuable catalytic and adsorptive properties of heterogeneous catalysts at atomic and electronic levels is essential for the design of novel catalysts. Computer simulation studies can significantly contribute to provide a rational interpretation of the observed experimental results and suggest modification of new catalysts. Our recent work on the application of integrated computer simulation methods to investigate the structure and catalytic properties of solid surfaces including zeolites, transition metals and their oxides have been reviewed in this paper. We have emphasized the effectivity and applicability of integrated computer simulation system to solve the problems in a variety of …
Density Functional Theory Study On The Electronic Structure Of N- And P-Type Doped Srtio3 At Anodic Solid Oxide Fuel Cell Conditions, S. Suthirakun, Salai Ammal, G. Xiao, Fanglin Chen, Hans-Conrad Zur Loye, Andreas Heyden
Density Functional Theory Study On The Electronic Structure Of N- And P-Type Doped Srtio3 At Anodic Solid Oxide Fuel Cell Conditions, S. Suthirakun, Salai Ammal, G. Xiao, Fanglin Chen, Hans-Conrad Zur Loye, Andreas Heyden
Salai C. Ammal
The electronic conductivity and thermodynamic stability of mixed n-type and p-type doped SrTiO3 have been investigated at anodic solid oxide fuel cell (SOFC) conditions using density functional theory (DFT) calculations. In particular, constrained ab initio thermodynamic calculations have been performed to evaluate the phase stability and reducibility of various Nb- and Ga-doped SrTiO3 at synthesized and anodic SOFC conditions. The density of states (DOS) of these materials was analyzed to study the effects of n- and p-doping on the electronic conductivity. In agreement with experimental observations, we find that the transformation from 20% Nb-doped Sr-deficient SrTiO3 to a non-Sr-deficient phase …
Electrical Resistance Monitoring Of Damage And Crack Growth In Advanced Sic-Based Ceramic Composites, Gregory Morscher, Craig Smith, Emmanuel Maillet, Chris Baker, Rabih Monsour
Electrical Resistance Monitoring Of Damage And Crack Growth In Advanced Sic-Based Ceramic Composites, Gregory Morscher, Craig Smith, Emmanuel Maillet, Chris Baker, Rabih Monsour
Dr. Gregory N. Morscher
No abstract provided.
Correlating Electrical Resistance Change With Mechanical Damage In Woven Sic/Sic Composites: Experiment And Modeling, Thanyawalai Sujidkul, Craig Smith, Zhijun Ma, Gregory Morscher, Zhenhai Xia
Correlating Electrical Resistance Change With Mechanical Damage In Woven Sic/Sic Composites: Experiment And Modeling, Thanyawalai Sujidkul, Craig Smith, Zhijun Ma, Gregory Morscher, Zhenhai Xia
Dr. Gregory N. Morscher
Silicon carbide (SiC) fiber-reinforced SiC matrix composites are inherently multifunctional materials. In addition to their primary function as a structural material, the electric properties of the SiC/SiC composites could be used for the sensing and monitoring of in situ damage nucleation and evolution. To detect damage and use that information to further predict the useful life of a particular component, it is necessary to establish the relationship between damage and electrical resistance change. Here, two typical SiC/SiC composites, melt infiltrated (MI), and chemical vapor infiltrated (CVI) woven SiC/SiC composites, were tested to establish the relationship between the electrical response and …
Magnetic Properties Of Crystals Of La5Mo4-XTXO16, S. Lofland, Jason Hattrick-Simpers, K. Ramanujachary, W. Mccarroll
Magnetic Properties Of Crystals Of La5Mo4-XTXO16, S. Lofland, Jason Hattrick-Simpers, K. Ramanujachary, W. Mccarroll
Jason R. Hattrick-Simpers
No abstract provided.
Development Of A High-Throughput Methodology For Screening Coking Resistance Of Modified Thin-Film Catalysts, Kaijian Yang, John Bedenbaugh, Hang Li, Michael Peralta, Johnathan Bunn, Jochen Lauterbach, Jason Hattrick-Simpers
Development Of A High-Throughput Methodology For Screening Coking Resistance Of Modified Thin-Film Catalysts, Kaijian Yang, John Bedenbaugh, Hang Li, Michael Peralta, Johnathan Bunn, Jochen Lauterbach, Jason Hattrick-Simpers
Jason R. Hattrick-Simpers
No abstract provided.
Applications Of High Throughput Screening Tools For Thermoelectric Materials, W. Wong-Ng, H. Joress, J. Martin, Y. Yan, M. Otani, E. Thomas, M. Green, Jason Hattrick-Simpers
Applications Of High Throughput Screening Tools For Thermoelectric Materials, W. Wong-Ng, H. Joress, J. Martin, Y. Yan, M. Otani, E. Thomas, M. Green, Jason Hattrick-Simpers
Jason R. Hattrick-Simpers
No abstract provided.
Data Management And Visualization Of X-Ray Diffraction Spectra From Thin Film Ternary Composition Spreads, I. Takeuchi, C. Long, O. Famodu, M. Murakami, Jason Hattrick-Simpers, G. Rubloff, M. Stukowski, K. Rajan
Data Management And Visualization Of X-Ray Diffraction Spectra From Thin Film Ternary Composition Spreads, I. Takeuchi, C. Long, O. Famodu, M. Murakami, Jason Hattrick-Simpers, G. Rubloff, M. Stukowski, K. Rajan
Jason R. Hattrick-Simpers
We discuss techniques for managing and visualizing x-ray diffraction spectrum data for thin film composition spreads which map large fractions of ternary compositional phase diagrams. An in-house x-ray microdiffractometer is used to obtain spectra from over 500 different compositions on an individual spread. The MATLAB software is used to quickly organize the data and create various plots from which one can quickly grasp different information regarding structural and phase changes across the composition spreads. Such exercises are valuable in rapidly assessing the “overall” picture of the structural evolution across phase diagrams before focusing in on specific composition regions for detailed …
High-Throughput Screening Of Magnetic Properties Of Quench Metallic-Alloy Thin-Film Composition Spreads, Jason Hattrick-Simpers, Cui Jun, Makoto Murakami, Antonio Orozco, Lee Knauss, Robert Booth, Edward Greve, Samuel Lofland, Manfred Wuttig, Ichiro Takeuchi
High-Throughput Screening Of Magnetic Properties Of Quench Metallic-Alloy Thin-Film Composition Spreads, Jason Hattrick-Simpers, Cui Jun, Makoto Murakami, Antonio Orozco, Lee Knauss, Robert Booth, Edward Greve, Samuel Lofland, Manfred Wuttig, Ichiro Takeuchi
Jason R. Hattrick-Simpers
No abstract provided.
Data Analysis In Combinatorial Experiments: Applying Supervised Principal Component Technique To Investigate The Relationship Between Tof-Sims Spectra And The Composition Distribution Of Ternary Metallic Alloy Thin Films, Rossana Dell'anna, Palo Lazzeri, Roberto Canteri, Christian Long, Jason Hattrick-Simpers, Ichiro Takeuchi, Mariano Anderle
Data Analysis In Combinatorial Experiments: Applying Supervised Principal Component Technique To Investigate The Relationship Between Tof-Sims Spectra And The Composition Distribution Of Ternary Metallic Alloy Thin Films, Rossana Dell'anna, Palo Lazzeri, Roberto Canteri, Christian Long, Jason Hattrick-Simpers, Ichiro Takeuchi, Mariano Anderle
Jason R. Hattrick-Simpers
No abstract provided.
Phase Transformation In An Yttrium-Hydrogen System Studied By Tem, K. Wang, Jason Hattrick-Simpers, L. Bendersky
Phase Transformation In An Yttrium-Hydrogen System Studied By Tem, K. Wang, Jason Hattrick-Simpers, L. Bendersky
Jason R. Hattrick-Simpers
No abstract provided.
Fabrication And Characterization Of In-Situ Grown Epitaxial Ba1-XSrXTio3 Composition Spreads, K. Chang, M. Aronova, O. Famodu, Jason Hattrick-Simpers, S. Lofland, I. Takeuchi, C. Lu, L. Bendersky, H. Chang
Fabrication And Characterization Of In-Situ Grown Epitaxial Ba1-XSrXTio3 Composition Spreads, K. Chang, M. Aronova, O. Famodu, Jason Hattrick-Simpers, S. Lofland, I. Takeuchi, C. Lu, L. Bendersky, H. Chang
Jason R. Hattrick-Simpers
No abstract provided.
Raman Spectroscopic Observation Of Dehydration In Ball-Milled Linh2-Libh4-Mgh2 Nanoparticles, Jason Hattrick-Simpers, James Maslar, Michael Niemann, Chun Chiu, Sesha Srinivasan, Elias Stefanakos, Leonid Bendersky
Raman Spectroscopic Observation Of Dehydration In Ball-Milled Linh2-Libh4-Mgh2 Nanoparticles, Jason Hattrick-Simpers, James Maslar, Michael Niemann, Chun Chiu, Sesha Srinivasan, Elias Stefanakos, Leonid Bendersky
Jason R. Hattrick-Simpers
No abstract provided.
Synthesis And Characterization Of Sr3Femoo6.88: An Oxygen-Deficient 2d Analogue Of The Double Perobskite Sr2Femoo6, Gabriel Veith, Martha Greenblatt, Mark Croft, K. Ramanujachary, Jason Hattrick-Simpers, Samuel Lofland, Israel Nowik
Synthesis And Characterization Of Sr3Femoo6.88: An Oxygen-Deficient 2d Analogue Of The Double Perobskite Sr2Femoo6, Gabriel Veith, Martha Greenblatt, Mark Croft, K. Ramanujachary, Jason Hattrick-Simpers, Samuel Lofland, Israel Nowik
Jason R. Hattrick-Simpers
No abstract provided.
Determination Of Work Functions In The Ta1-XAlXNY/Hfo2 Advanced Gate Stack Using Combinatorial Methodology, Kao-Shuo Chang, Martin Green, Jason Hattrick-Simpers, Ichiro Takeuchi, J. Suehle, O. Celik, S. De Gendt
Determination Of Work Functions In The Ta1-XAlXNY/Hfo2 Advanced Gate Stack Using Combinatorial Methodology, Kao-Shuo Chang, Martin Green, Jason Hattrick-Simpers, Ichiro Takeuchi, J. Suehle, O. Celik, S. De Gendt
Jason R. Hattrick-Simpers
No abstract provided.
Phase Formation And Hydrogen Ordering In Yttrium-Hydrogen System, Ke Wang, Jason Hattrick-Simpers, Leonid Bendersky
Phase Formation And Hydrogen Ordering In Yttrium-Hydrogen System, Ke Wang, Jason Hattrick-Simpers, Leonid Bendersky
Jason R. Hattrick-Simpers
No abstract provided.
Combinatorial Study Of Ni-Ti-Pt Ternary Metal Gate Electrodes On Hfo2 For The Advanced Gate Stack, K.-S. Chang, M. Green, J. Suehle, E. Vogel, H. Xiong, Jason Hattrick-Simpers, I. Takeuchi, O. Famodu, K. Ohmori, P. Ahmet, T. Chikyow, P. Majhi, B.-H. Lee, M. Gardner
Combinatorial Study Of Ni-Ti-Pt Ternary Metal Gate Electrodes On Hfo2 For The Advanced Gate Stack, K.-S. Chang, M. Green, J. Suehle, E. Vogel, H. Xiong, Jason Hattrick-Simpers, I. Takeuchi, O. Famodu, K. Ohmori, P. Ahmet, T. Chikyow, P. Majhi, B.-H. Lee, M. Gardner
Jason R. Hattrick-Simpers
The authors have fabricated combinatorial Ni–Ti–Pt ternary metal gate thin film libraries on HfO2 using magnetron co-sputtering to investigate flatband voltage shift (ΔVfb) , work function (Φm) , and leakage current density (JL) variations. A more negative ΔVfb is observed close to the Ti-rich corner than at the Ni- and Pt-rich corners, implying smaller Φm near the Ti-rich corners and higher Φm near the Ni- and Pt-rich corners. In addition, measured JL values can be explained consistently with the observed Φm variations. Combinatorial methodologies prove to be useful in surveying the large compositional space of ternary alloymetal gate electrode systems.
High-Throughput Characterization Of Shape Memory Thin Films Using Automated Temperature-Dependent Resistance Measurements, Sigurd Thienhaus, Christiane Zamponi, Holger Rumpf, Jason Hattrick-Simpers, Ichiro Takeuchi, Alfred Ludwig
High-Throughput Characterization Of Shape Memory Thin Films Using Automated Temperature-Dependent Resistance Measurements, Sigurd Thienhaus, Christiane Zamponi, Holger Rumpf, Jason Hattrick-Simpers, Ichiro Takeuchi, Alfred Ludwig
Jason R. Hattrick-Simpers
No abstract provided.
The Materials Super Highway: Integrating High-Throughput Experimentation Into Mapping The Catalysis Materials Genome, Jason Hattrick-Simpers, Cun Wen, Jochen Lauterbach
The Materials Super Highway: Integrating High-Throughput Experimentation Into Mapping The Catalysis Materials Genome, Jason Hattrick-Simpers, Cun Wen, Jochen Lauterbach
Jason R. Hattrick-Simpers
No abstract provided.