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Molecular Dynamics Simulation Of Tensile Behavior On Ceramic Particles Reinforced Aluminum Matrix Nanocomposites, Heng Gu, Jiaojiao Wang, Zhongwei Li 2016 Rexa Inc.

Molecular Dynamics Simulation Of Tensile Behavior On Ceramic Particles Reinforced Aluminum Matrix Nanocomposites, Heng Gu, Jiaojiao Wang, Zhongwei Li

Heng Gu

The mechanical properties and interfacial structures for aluminum matrix composites reinforced by nanometer-sized SiC-β particles has been studied using molecular dynamics (MD) simulation. The modified embedded atom methods, was implemented to describe the atomic interactions. The molecular model undergoes an annealing MD simulation from 300 K to 1000 K to reach its minimum energy point. Tensile tests were performed with periodic boundary conditions. The stress-strain relationship has been studied and elastic constants were predicted as well. The results were compared with those given by continuum-based finite element analysis (FEA) together with the experimental data available in the literatures. It showed ...


Carbon Nanoadditives To Enhance Latent Energy Storage Of Phase Change Materials, Shadab Shaikh, Khalid Lafdi, Kevin P. Hallinan 2016 University of Dayton

Carbon Nanoadditives To Enhance Latent Energy Storage Of Phase Change Materials, Shadab Shaikh, Khalid Lafdi, Kevin P. Hallinan

Kevin Hallinan

Latent energy storage capacity was analyzed for a system consisting of carbon nanoparticlesdopedphase changematerials (PCMs). Three types of samples were prepared by doping shell wax with single wall carbon nanotubes(SWCNTs), multiwall CNTs, and carbon nanofibers. Differential scanning calorimetry was used to measure the latent heat of fusion. The measured values of latent heat for all the samples showed a good enhancement over the latent heat of pure wax. A maximum enhancement of approximately 13% was observed for the wax/SWCNT composite corresponding to 1% loading of SWCNT. The change in latent heat was modeled by using an approximation for ...


Technical Developments In Fish Exclusion, Guidance, And Collection Materials, A. L. Peters 2016 Pacific Netting Products

Technical Developments In Fish Exclusion, Guidance, And Collection Materials, A. L. Peters

6ᵗʰ International Symposium on Hydraulic Structures

Construction of mills, dams and other structures in rivers and streams, and the withdrawal of water for irrigation or cooling industrial facilities vital to social and economic progress, have impacted the survival of marine life. Barriers and guidance or collection nets can protect fish and aquatic species while allowing water to flow unimpeded for commercial and industrial use. However, nets can attract aquatic growth, fill with debris, degrade with environmental stress, and be expensive to operate and maintain.

A closer look at the technical developments of materials and net designs in diverse settings can offer guidance that will be of ...


Effect Of Microstrain On The Magnetic Properties Of Bifeo3 Nanoparticles, Pavana S. V. Mocherla, C. Karthik, R. Ubic, M. S. Ramachandra Rao, C. Sudakar 2016 Indian Institute of Technology Madras

Effect Of Microstrain On The Magnetic Properties Of Bifeo3 Nanoparticles, Pavana S. V. Mocherla, C. Karthik, R. Ubic, M. S. Ramachandra Rao, C. Sudakar

Karthik Chinnathambi

We report on size induced microstrain-dependent magnetic properties of BiFeO3 nanoparticles.The microstrain is found to be high (ε > 0.3%) for smaller crystallite sizes (d < 30 nm), and shows a sharp decrease as the particle size increases. The presence of pseudo-cubic symmetry is evidenced for these nanoparticles. Raman spectral studies suggest straightening of the Fe-O-Fe bond angle accompanied by a decrease in FeO6 octahedral rotation for d < 65 nm. Themagnetization shows a dip around 30 nm, half the size of spin cycloid length for BiFeO3, due to a decrease in rhombohedral distortion with crystallite size. We also observe a similar trend in the TN with respect to size indicating that the microstrain plays a significant role in controlling the magnetic property of BiFeO3.


Effect Of Ca2+ Substitution On The Structure, Microstructure, And Microwave Dielectric Properties Of Sr2Al2Sio7 Ceramic, Kurusaroor Mana Manu, Chinnathambi Karthik, Rick Ubic, Mailadil Thomas Sebastian 2016 National Institute for Interdisciplinary Science and Technology

Effect Of Ca2+ Substitution On The Structure, Microstructure, And Microwave Dielectric Properties Of Sr2Al2Sio7 Ceramic, Kurusaroor Mana Manu, Chinnathambi Karthik, Rick Ubic, Mailadil Thomas Sebastian

Karthik Chinnathambi

The effect of Ca2+ substitution on the structure, microstructure, and microwave dielectric properties of Sr–gehlenite (Sr2Al2SiO7) ceramic has been investigated. The structure and microstructure of Sr2-xCaxAl2SiO7ceramics were analyzed via X-ray diffraction (XRD) as well as scanning and transmission electron microscopic techniques. While the end-members (x = 0 and 2) form isostructural compounds, a highly defective, nonstoichiometric, Ca-rich secondary phase was observed via bright-field transmission electron microscopy and energy dispersive X-ray spectroscopy in compositions corresponding to x = 0.75 and 1.5. The concentration of secondary phase ...


Partial Oxidation Of Surrogate Jet-A Fuel Over Sio2 Supported Moo2, Shreya Shah, Oscar G. Marin-Flores, Chinnathambi Karthik, M. Grant Norton, Su Ha 2016 Washington State University

Partial Oxidation Of Surrogate Jet-A Fuel Over Sio2 Supported Moo2, Shreya Shah, Oscar G. Marin-Flores, Chinnathambi Karthik, M. Grant Norton, Su Ha

Karthik Chinnathambi

A SiO2-supported MoO2 nanoparticle catalyst was synthesized by a sol-gel method and tested as catalytic material for the partial oxidation of n-dodecane. MoO2 nanoparticles supported on SiO2 are °C, which is a typical reforming temperature for n-dodecane. The formation of Mo O Si bonds at the interface between MoO2 nanoparticles and SiO2 support appear to be responsible for the enhanced stability to sintering displayed by the nanoparticles. As a result of this particle size stabilization, SiO2 supported MoO2 nanoparticles show an improved reforming activity in terms of syngas generation ...


Structural Stability And Microwave Dielectric Properties Of (1-X)Ba(Mg1/2W1/2)O3−XBa(Re2/3W1/3)O3 (Re = Sm, Dy, Y, Yb) Solid Solutions, Jianjiang Bian, Jiayin Wu, Rick Ubic, C. Karthik, Y. Wu 2016 Shanghai University

Structural Stability And Microwave Dielectric Properties Of (1-X)Ba(Mg1/2W1/2)O3−XBa(Re2/3W1/3)O3 (Re = Sm, Dy, Y, Yb) Solid Solutions, Jianjiang Bian, Jiayin Wu, Rick Ubic, C. Karthik, Y. Wu

Karthik Chinnathambi

The structural stability and microstructure of (1−x)Ba(Mg1/2W1/2)O3−xBa(RE2/3W1/3)O3 (RE = Sm, Dy, Y, Yb) ceramics have been investigated by X-ray diffraction (XRD), Raman spectrometry, transmission electron microscopy (TEM) and scanning electron microscopy (SEM) in this work. Microwave dielectric properties were studied in the frequency range 7–13 GHz. Phase-pure solid solutions formed in space group Fm-3m within the compositional range of x = 0.01–0.05. The local ordering of the two cations (RE3+ and W6+ or Mg2+) produced ...


Neutron Irradiation Induced Microstructural Changes In Nbg-18 And Ig-110 Nuclear Graphites, Chinnathambi Karthik, Joshua Kane, Darryl Butt, William E. Windes, Rick Ubic 2016 Boise State University

Neutron Irradiation Induced Microstructural Changes In Nbg-18 And Ig-110 Nuclear Graphites, Chinnathambi Karthik, Joshua Kane, Darryl Butt, William E. Windes, Rick Ubic

Karthik Chinnathambi

This paper reports the neutron-irradiation-induced effects on the microstructure of NBG-18 and IG-110 nuclear graphites. The high-temperature neutron irradiation at two different irradiation conditions was carried out at the Advanced Test Reactor National User Facility at the Idaho National Laboratory. NBG-18 samples were irradiated to 1.54 dpa and 6.78 dpa at 430 °C and 678 °C respectively. IG-110 samples were irradiated to 1.91 dpa and 6.70 dpa at 451 °C and 674 °C respectively. Bright-field transmission electron microscopy imaging was used to study the changes in different microstructural components such as filler particles, microcracks, binder and ...


Suppression Of FeLi Antisite Defects In Fluorine-Doped Lifepo4, A. V. Radhamani, C. Karthik, Rick Ubic, M.S. Ramachandra Rao, C. Sudakar 2016 Indian Institute of Technology - Madras

Suppression Of FeLi Antisite Defects In Fluorine-Doped Lifepo4, A. V. Radhamani, C. Karthik, Rick Ubic, M.S. Ramachandra Rao, C. Sudakar

Karthik Chinnathambi

We report on the suppression of FeLi antisite defects in LiFe(PO4)1−xF3x with 0 ⩽ x ⩽ 0.4 prepared by sol–gel and hydrothermal methods. Evidence for a systematic suppression of antisite defects upon fluorine doping in LiFePO4 is inferred from Fourier transform infrared spectra, wherein a noticeable red shift in the symmetric P–O stretching vibrational mode of (PO4)3− polyanion from 970 to 957 cm−1 was observed. We report detailed structural and compositional studies of LiFe(PO4)1−xF3x, and discuss the implications for the ...


Tunable Bandgap In Bifeo3 Nanoparticles: The Role Of Microstrain And Oxygen Defects, Pavana S. V. Mocherla, C. Karthik, R. Ubic, M. S. Ramachandra Rao 2016 Indian Institute of Technology - Madras

Tunable Bandgap In Bifeo3 Nanoparticles: The Role Of Microstrain And Oxygen Defects, Pavana S. V. Mocherla, C. Karthik, R. Ubic, M. S. Ramachandra Rao

Karthik Chinnathambi

We demonstrate a tunable bandgap from 2.32 eV to 2.09 eV in phase-pure BiFeO3 by controlling the particle size from 65 nm to 5 nm. Defect states due to oxygen and microstrain show a strong dependence on BiFeO3 particle size and have a significant effect on the shape of absorbance curves. Oxygen-defect induced microstrain and undercoordinated oxygen on the surface of BiFeO3 nanoparticles are demonstrated via HRTEM and XPS studies. Microstrain in the lattice leads to the reduction in rhombohedral distortion of BiFeO3 for particle sizes below 30 nm. The decrease in band gap ...


Fracture Strength And Principal Stress Fields During Crush Testing Of The Sic Layer In Triso-Coated Fuel Particles, Brian C. Davis, Logan Ward, Darryl P. Butt, Brent Fillery, Ivar Reimanis 2016 Colorado School of Mines

Fracture Strength And Principal Stress Fields During Crush Testing Of The Sic Layer In Triso-Coated Fuel Particles, Brian C. Davis, Logan Ward, Darryl P. Butt, Brent Fillery, Ivar Reimanis

Darryl P. Butt

Diametrical compression testing is an important technique to evaluate fracture properties of the SiC layer in TRISO-coated nuclear fuel particles. This study was conducted to expand the understanding and improve the methodology of the test. An analytic solution and multiple FEA models are used to determine the development of the principal stress fields in the SiC shell during a crush test. An ideal fracture condition where the diametrical compression test best mimics in-service internal pressurization conditions was discovered. For a small set of empirical data points, results from different analysis methodologies were input to an iterative Weibull equation set to ...


Progress Of Carbonation In Chloride Contaminated Concretes, Yaocheng Wang, P. A.M. Basheer, S. Nanukuttan, Y. Bai 2016 Shenzhen University

Progress Of Carbonation In Chloride Contaminated Concretes, Yaocheng Wang, P. A.M. Basheer, S. Nanukuttan, Y. Bai

International Conference on Durability of Concrete Structures

Concretes used in marine environment are generally under the cyclic effect of CO2 and chloride ions (Cl-). To date, the influence of carbonation on ingress of chloride ions in concretes has been widely studied; in comparison, study on the influence of Cl- on the progress of carbonation is limited. During the study, concretes were exposed to independent and combined mechanisms of carbonation and chloride ingress regimes. Profiles of apparent pH and chloride concentration were used to indicate the progress of carbonation and ingress of Cl- in concretes. From the apparent pH profile, a carbonation front and a carbonation boundary ...


Carbon Fiber As Anode Material For Cathodic Prevention In Cementitious Materials, Emma Qingnan Zhang, Luping Tang, Thomas Zack 2016 Chalmers University of Technology

Carbon Fiber As Anode Material For Cathodic Prevention In Cementitious Materials, Emma Qingnan Zhang, Luping Tang, Thomas Zack

International Conference on Durability of Concrete Structures

Cathodic prevention (CPre) technique is a promising method and has been used for the past two decades to prevent steel from corrosion in concrete structures. However, wide application of this technique has been restricted due to high costs of anode materials. In order to lower the cost and further improve this technique, carbon fiber composite anode has been introduced as an alternative anode material with affordable price and other outstanding properties. This paper presents the study of using carbon fiber mesh as anode material for long-term cathodic prevention system and the effect of accelerated current on macro- and microstructure of ...


Corrosion Of Steel In Concrete And Its Prevention In Aggressive Chloride-Bearing Environments, Luca Bertolini, Maddalena Carsana, Matteo Gastaldi, Federica Lollini, Elena Redaelli 2016 Politecnico di Milano

Corrosion Of Steel In Concrete And Its Prevention In Aggressive Chloride-Bearing Environments, Luca Bertolini, Maddalena Carsana, Matteo Gastaldi, Federica Lollini, Elena Redaelli

International Conference on Durability of Concrete Structures

This keynote paper deals with the durability of reinforced concrete (RC) structures exposed to aggressive environments characterized by high concentration of chloride ions, namely, marine environments or the use of de-icing salts. The mechanism of chloride-induced corrosion of steel in concrete is introduced, and its influence on the service life of RC structures is analyzed. Factors affecting the time to corrosion initiation are described with regard to both concrete properties and environmental exposure conditions. Design approaches available for achieving durability targets associated with the design service life are analyzed, focusing on studies carried out by the authors in recent years ...


Low-Cost Prosthetic Transfemoral Socket, Emelie Deans, Joshua Ledgerwood, Leah Moore, Shaina Jung, Kristen Temnyk 2016 California Polytechnic State University, San Luis Obispo

Low-Cost Prosthetic Transfemoral Socket, Emelie Deans, Joshua Ledgerwood, Leah Moore, Shaina Jung, Kristen Temnyk

Mechanical Engineering

The goal of this senior project was to design and fabricate a low-cost adjustable prosthetic socket for above the knee amputees. This low-cost consideration was incorporated with the original intent to be used in Fiji, however, this changed to the Dominican Republic. It became clear that the need for an adjustable socket was more as a transitional socket. This transitional socket would be used for the first 6 -12 months upon amputation because this when the most amount of volume fluctuation occurs. The project sponsor, LIM Innovations, has already designed the Infinite Socket which contains four main functioning parts: baseplate ...


Biomimetic Seal Flipper Test Rig, Gordon D. Belyea, Laura Kawashiri, Dylan Rinker, Kurt Beske 2016 California Polytechnic State University, San Luis Obispo

Biomimetic Seal Flipper Test Rig, Gordon D. Belyea, Laura Kawashiri, Dylan Rinker, Kurt Beske

Mechanical Engineering

No abstract provided.


Stress Singularity Study Of Functionally Graded Material Based On Coherent Gradient Sensing Method, Jinjun Zhang 2016 Arizona State University

Stress Singularity Study Of Functionally Graded Material Based On Coherent Gradient Sensing Method, Jinjun Zhang

Kevin Lee


Functionally graded material (FGM) has some particular characteristics due to the gradual variation of physical properties. The study on mechanical behavior of FGM is of great research value. In this work, a large scale FGM which filled with small glass spheres has been prepared by gravity assisted casting technique. The elastic material constants in static condition are measured. One optical experimental method, coherent gradient sensing (CGS), is introduced to study the mechanical behavior of FGM which has exponential variation of material property. The governing equations of CGS which is used to represent the optics-mechanics relation of the singular yield near ...


Zno Thin Films Generated By Ex-Situ Thermal Oxidation Of Metallic Zn For Photovoltaic Applications, Kovas Zygas 2016 Macalester College

Zno Thin Films Generated By Ex-Situ Thermal Oxidation Of Metallic Zn For Photovoltaic Applications, Kovas Zygas

Macalester Journal of Physics and Astronomy

ZnO thin films that function as either transparent conducting oxides in solid-state photovoltaic cells or as nanocrystalline dye-absorbers in dye-sensitized solar cells have the potential to reduce the cost of producing electricity from solar energy. Although there exist many methods to produce ZnO thin films, the most economical and practical method may be oxidation of metallic Zn thin films. This research examined the utility of ex-situ thermal oxidation of DC magnetron sputtered Zn thin films in generating useful ZnO thin films for these photovoltaic applications. We annealed Zn thin films in air at 570° C in order to produce ZnO ...


Metal Assisted Chemical Etching, Inayat Bajwa 2016 Quattrone Nanofabrication Facility

Metal Assisted Chemical Etching, Inayat Bajwa

Protocols and Reports

No abstract provided.


Reflective Efficiencies Of Materials For Applications Of Bifacial Solar Cells, Michael Metter 2016 Linfield College

Reflective Efficiencies Of Materials For Applications Of Bifacial Solar Cells, Michael Metter

Senior Theses

The bifacial solar cell is superior to its monofacial predecessor due to its ability to convert both incident light on top and reflected light from below into energy. The scattering of the reflected light is affected by the property of the material on which it is interacting. To date, little work has been contributed to studying the properties of these materials to determine optimal quantities for bifacial solar cells. In the first experiment, reflective efficiencies compared to the angle of reflection were explored for different grit of sandpaper in order to develop an understanding of how surface texture impacts reflectivity ...


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