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Articles 1 - 6 of 6
Full-Text Articles in Physical Sciences and Mathematics
Use Of Grooved Microchannels To Improve The Performance Of Membrane-Less Fuel Cells, J. D'Alessandro, Petru S. Fodor
Use Of Grooved Microchannels To Improve The Performance Of Membrane-Less Fuel Cells, J. D'Alessandro, Petru S. Fodor
Physics Faculty Publications
In this work, the fluid dynamics within a membrane-less microchannel fuel cell is analyzed computationally. The membrane-less design is a result of the laminar nature of the fluid flow at small Reynolds numbers, restricting the fuel and oxidant to the vicinity of the corresponding electrodes, without the need of a proton exchange membrane (PEM). However, the performance of such cells is limited by the slow diffusive mass transport near the electrodes, with a large fraction of the reactants leaving the channel without coming in contact with the catalytic surfaces, and thus not being used. We mitigate this problem through the …
Measurements Of Turbulent Mixing And Subsiding Shells In Trade Wind Cumuli, Jeannine Katzwinkel, Holger Siebert, Thijs Heus, Raymond A. Shaw
Measurements Of Turbulent Mixing And Subsiding Shells In Trade Wind Cumuli, Jeannine Katzwinkel, Holger Siebert, Thijs Heus, Raymond A. Shaw
Physics Faculty Publications
High-resolution measurements of the turbulent, thermodynamic, and microphysical structure of the edges of trade wind cumuli have been performed with the Airborne Cloud Turbulence Observation System. Lateral entrainment of subsaturated air into the cloud region leads to an evaporative cooling effect. The negatively buoyant air partly enhances the compensating downdraft, forming a subsiding shell at cloud edge. Based on the presented observations, the subsiding shell is divided into a turbulent and humid inner shell adjacent to the cloud interior and a nonbuoyant, nonturbulent outer shell. In the trade wind region, continuous development of shallow cumuli over the day allows for …
Near Real-Time Measurement Of Forces Applied By An Optical Trap To A Rigid Cylindrical Object, Joseph Glaser, David Hoeprich, Andrew Resnick
Near Real-Time Measurement Of Forces Applied By An Optical Trap To A Rigid Cylindrical Object, Joseph Glaser, David Hoeprich, Andrew Resnick
Physics Faculty Publications
An automated data acquisition and processing system is established to measure the force applied by an optical trap to an object of unknown composition in real time. Optical traps have been in use for the past 40 years to manipulate microscopic particles, but the magnitude of applied force is often unknown and requires extensive instrument characterization. Measuring or calculating the force applied by an optical trap to nonspherical particles presents additional difficulties which are also overcome with our system. Extensive experiments and measurements using well-characterized objects were performed to verify the system performance.
The Impact Of The Initial Surface Reconstruction On Heteroepitaxial Film Growth And Defect Formation, Jessica E. Bickel, Joanna Mirecki Millunchick
The Impact Of The Initial Surface Reconstruction On Heteroepitaxial Film Growth And Defect Formation, Jessica E. Bickel, Joanna Mirecki Millunchick
Physics Faculty Publications
While it is well known that growth conditions such as temperature greatly affect defect incorporation in thin films, less is known about the direct effects of the surface reconstruction. In this work, we examine the effect of the initial surface reconstruction on defect incorporation in GaSb/GaAs(001) lattice mismatched films. The stress built up in GaSb films grown on As-terminated and Sb-terminated GaAs was monitored during film growth and shows that the total relaxation is similar in both films along the [110], but lower on the Sb-terminated surface along the . These differences can be understood by examining the ability for …
Detection And Antibiotic Treatment Of Mycoplasma Arginini Contamination In A Mouse Epithelial Cell Line Restore Normal Cell Physiology, Brianna Boslett, Subhra Nag, Andrew Resnick
Detection And Antibiotic Treatment Of Mycoplasma Arginini Contamination In A Mouse Epithelial Cell Line Restore Normal Cell Physiology, Brianna Boslett, Subhra Nag, Andrew Resnick
Physics Faculty Publications
Mycoplasma contamination of cultured cell lines is difficult to detect by routine observation. Infected cells can display normal morphology and the slow growth rate of mycoplasma can delay detection for extended periods of time, compromising experimental results. Positive identification of mycoplasma typically requires cells to be either fixed and stained for DNA or processed with PCR. We present a method to detect mycoplasma using live-cell optical microscopy typically used for routine observation of cell cultures. Images of untreated mycoplasma-infected epithelial cells alongside images of infected cells treated with Plasmocin, a commercially available antibiotic targeted to mycoplasma, are shown. We found …
The Creation Of 360° Domain Walls In Ferromagnetic Nanorings By Circular Applied Magnetic Fields, Jessica E. Bickel, Spencer A. Smith, Katherine E. Aidala
The Creation Of 360° Domain Walls In Ferromagnetic Nanorings By Circular Applied Magnetic Fields, Jessica E. Bickel, Spencer A. Smith, Katherine E. Aidala
Physics Faculty Publications
Switching behavior in ferromagnetic nanostructures is often determined by the formation and annihilation of domain walls (DWs). In contrast to the more familiar 180° DWs found in most nanostructures, 360° DWs are the proposed transition state of nanorings. This paper examines the formation of 360° DWs created by the application of a circular magnetic field using micromagnetic simulations. 360° DWs form from pairs of canting moments that are oppositely aligned, which each grow to form rotated domains bounded by two 180° DWs and the 180° DWs combine to form 360° DWs. The resulting 360° DWs occur in pairs of opposite …