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Multitasking mesoporous nanomaterials for biorefinery applications

Description: Mesoporous silica nanoparticles (MSNs) have attracted great interest for last two decades due to their unique and advantageous structural properties, such as high surface area, pore volume, stable mesostructure, tunable pore size and controllable particle morphology. The robust silica framework provides sites for organic modifications, making MSNs ideal platforms for adsorbents and supported organocatalysts. In addition, the pores of MSNs provide cavities/ channels for incorporation of metal an… more
Date: May 2, 2013
Creator: Kandel, Kapil
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

GPU-optimized Code for Long-term Simulations of Beam-beam Effects in Colliders

Description: We report on the development of the new code for long-term simulation of beam-beam effects in particle colliders. The underlying physical model relies on a matrix-based arbitrary-order symplectic particle tracking for beam transport and the Bassetti-Erskine approximation for beam-beam interaction. The computations are accelerated through a parallel implementation on a hybrid GPU/CPU platform. With the new code, a previously computationally prohibitive long-term simulations become tractable. We … more
Date: June 1, 2013
Creator: Roblin, Yves; Morozov, Vasiliy; Terzic, Balsa; Aturban, Mohamed A.; Ranjan, D. & Zubair, Mohammed
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

DE-FG02-08ER64658 (OASIS) - Final Technical Report

Description: Project OASIS (Operation of Advanced Structures, Interfaces and Sub-components for MEAs) was a 12 month project that ran from 1st September 2008 to 31st August 2009, and was managed by the Department of Energy Office of Science, Chicago Office, as Award No DE-FG02-08ER64658, with Johnson Matthey Fuel Cells Inc. as the sole contractor. The project was completed on schedule, with technical successes (details below) and payment of the full grant award made by DOE. The aim of the project was the de… more
Date: September 5, 2013
Creator: Sharman, Jonathan
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Guiding Center Equations for Ideal Magnetohydrodynamic Modes

Description: Guiding center simulations are routinely used for the discovery of mode-particle resonances in tokamaks, for both resistive and ideal instabilities and to find modifications of particle distributions caused by a given spectrum of modes, including large scale avalanches during events with a number of large amplitude modes. One of the most fundamental properties of ideal magnetohydrodynamics is the condition that plasma motion cannot change magnetic topology. The conventional representation of id… more
Date: February 21, 2013
Creator: White, Roscoe B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

ARM Lead Mentor Selection Process

Description: The ARM Climate Research Facility currently operates more than 300 instrument systems that provide ground-based observations of the atmospheric column. To keep ARM at the forefront of climate observations, the ARM infrastructure depends heavily on instrument scientists and engineers, also known as Instrument Mentors. Instrument Mentors must have an excellent understanding of in situ and remote-sensing instrumentation theory and operation and have comprehensive knowledge of critical scale-depend… more
Date: March 13, 2013
Creator: Sisterson, DL
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Development of Ultra High Gradient and High Q{sub 0} Superconducting Radio Frequency Cavities

Description: We report on the recent progress at Jefferson Lab in developing ultra high gradient and high Q{sub 0} superconducting radio frequency (SRF) cavities for future SRF based machines. A new 1300 MHz 9-cell prototype cavity is being fabricated. This cavity has an optimized shape in terms of the ratio of the peak surface field (both magnetic and electric) to the acceleration gradient, hence the name low surface field (LSF) shape. The goal of the effort is to demonstrate an acceleration gradient of 50… more
Date: June 1, 2013
Creator: Geng, Rongli; Clemens, William A.; Follkie, James E.; Harris, Teena M.; Kushnick, Peter W.; Machie, Danny et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Using Plasmon Peaks in Electron Energy-Loss Spectroscopy to Determine the Physical and Mechanical Properties of Nanoscale Materials

Description: In this program, we developed new theoretical and experimental insights into understanding the relationships among fundamental universality and scaling phenomena, the solid-state physical and mechanical properties of materials, and the volume plasmon energy as measured by electron energy-loss spectroscopy (EELS). Particular achievements in these areas are summarized as follows: (i) Using a previously proposed physical model based on the universal binding-energy relation (UBER), we established c… more
Date: May 9, 2013
Creator: Howe, James M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Isospin Decomposition of the Photoproduced Sigma pi System Near the Lambda(1405)

Description: Recent experimental results for the reaction \gamma + p \to K^+ + \Sigma + \pi\ from CLAS at Jefferson Lab are discussed. It was found that the mass distributions or "line shapes" of the three charge combinations \Sigma^+ \pi^-, \Sigma^0 \pi^0 and \Sigma^- \pi^+ differ significantly. Our results show that the \Lambda(1405), as the I=0 constituent of the reaction, must be accompanied by an I > 0 component. We discuss phenomenological fits to the data to test the possible forms and m… more
Date: September 1, 2013
Creator: U., Carnegie Mellon & U., Indiana
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Improvements to Existing Jefferson Lab Wire Scanners

Description: This poster will detail the augmentation of selected existing CEBAF wire scanners with commercially available hardware, PMTs, and self created software in order to improve the scanners both in function and utility.
Date: June 1, 2013
Creator: McCaughan, Michael D.; Tiefenback, Michael G. & Turner, Dennis L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Scheme of Beam Synchronization in MEIC

Description: Synchronizing colliding beams at single or multiple collision points is a critical R&D issue in the design of a medium energy electron-ion collider (MEIC) at Jefferson Lab. The path-length variation due to changes in the ion energy, which varies over 20 to 100 GeV, could be more than several times the bunch spacing. The scheme adopted in the present MEIC baseline is centered on varying the number of bunches (i.e., harmonic number) stored in the collider ring. This could provide a set of dis… more
Date: June 1, 2013
Creator: Zhang, Yuhong; Derbenev, Yaroslav S. & Hutton, Andrew M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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