Molecular Dynamics Simulation Of Tensile Behavior On Ceramic Particles Reinforced Aluminum Matrix Nanocomposites, Heng Gu, Jiaojiao Wang, Zhongwei Li
Carbon Nanoadditives To Enhance Latent Energy Storage Of Phase Change Materials, 2016 University of Dayton
Carbon Nanoadditives To Enhance Latent Energy Storage Of Phase Change Materials, Shadab Shaikh, Khalid Lafdi, Kevin P. 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, 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, 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
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, 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
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, 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
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
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, 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
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, 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
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, 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
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, 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, 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, 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, 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, 2016 California Polytechnic State University, San Luis Obispo
Low-Cost Prosthetic Transfemoral Socket, Emelie Deans, Joshua Ledgerwood, Leah Moore, Shaina Jung, Kristen Temnyk
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, 2016 California Polytechnic State University, San Luis Obispo
Biomimetic Seal Flipper Test Rig, Gordon D. Belyea, Laura Kawashiri, Dylan Rinker, Kurt Beske
No abstract provided.
Stress Singularity Study Of Functionally Graded Material Based On Coherent Gradient Sensing Method, 2016 Arizona State University
Stress Singularity Study Of Functionally Graded Material Based On Coherent Gradient Sensing Method, Jinjun Zhang
Zno Thin Films Generated By Ex-Situ Thermal Oxidation Of Metallic Zn For Photovoltaic Applications, 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, 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, 2016 Linfield College
Reflective Efficiencies Of Materials For Applications Of Bifacial Solar Cells, Michael Metter
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 ...