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Strategic partnerships final LDRD report : nanocomposite materials for efficient solar hydrogen production

Miller, James E.

This 'campus executive' project sought to advance solar thermochemical technology for producing the chemical fuels. The project advanced the common interest of Sandia National Laboratories and the University of Arizona in creating a sustainable and viable alternative to fossil fuels. The focus of this effort was in developing new methods for creating unique monolithic composite structures and characterizing their performance in thermochemical production of hydrogen from water. The development and processing of the materials was undertaken in the Materials Science and Engineering Department at the University of Arizona; Sandia National Laboratories performed the thermochemical characterization. Ferrite/yttria-stabilized zirconia composite monoliths were fabricated and shown to have exceptionally high utilization of the ferrite for splitting CO{sub 2} to obtain CO (a process analogous to splitting H{sub 2}O to obtain H{sub 2}).

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TYPE SAND Report YEAR 2012
DOIOSTI

Loop-to-loop coupling

Warne, Larry K.; Basilio, Lorena I.; Langston, William L.; Salazar, Robert A.; Coleman, Phillip D.; Lucero, Larry

This report estimates inductively-coupled energy to a low-impedance load in a loop-to-loop arrangement. Both analytical models and full-wave numerical simulations are used and the resulting fields, coupled powers and energies are compared. The energies are simply estimated from the coupled powers through approximations to the energy theorem. The transmitter loop is taken to be either a circular geometry or a rectangular-loop (stripline-type) geometry that was used in an experimental setup. Simple magnetic field models are constructed and used to estimate the mutual inductance to the receiving loop, which is taken to be circular with one or several turns. Circuit elements are estimated and used to determine the coupled current and power (an equivalent antenna picture is also given). These results are compared to an electromagnetic simulation of the transmitter geometry. Simple approximate relations are also given to estimate coupled energy from the power. The effect of additional loads in the form of attached leads, forming transmission lines, are considered. The results are summarized in a set of susceptibility-type curves. Finally, we also consider drives to the cables themselves and the resulting common-to-differential mode currents in the load.

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TYPE SAND Report YEAR 2012
DOIOSTI

Development of chemiresponsive sensors for detection of common homemade explosives

Brotherton, Christopher M.; Wheeler, David R.

Field-structured chemiresistors (FSCRs) are polymer based sensors that exhibit a resistance change when exposed to an analyte of interest. The amount of resistance change depends on the polymer-analyte affinity. The affinity can be manipulated by modifying the polymer within the FSCRs. In this paper, we investigate the ability of chemically modified FSCRs to sense hydrogen peroxide vapor. Five chemical species were chosen based on their hydrophobicity or reactivity with hydrogen peroxide. Of the five investigated, FSCRs modified with allyl methyl sulfide exhibited a significant response to hydrogen peroxide vapor. Additionally, these same FSCRs were evaluated against a common interferrant in hydrogen peroxide detection, water vapor. For the conditions investigated, the FSCRs modified with allyl methyl sulfide were able to successfully distinguish between water vapor and hydrogen peroxide vapor. A portion of the results presented here will be submitted to the Sensors and Actuators journal.

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TYPE SAND Report YEAR 2012
DOIOSTI

Summary of alpha-neutron sources in GADRAS

Thoreson, Gregory; Harding, Lee; Mitchell, Dean J.

A common source of neutrons for calibration and testing is alpha-neutron material, named for the alpha-neutron nuclear reaction that occurs within. This material contains a long-lived alpha-emitter and a lighter target element. When the alpha particle from the emitter is absorbed by the target, neutrons and gamma rays are released. Gamma Detector Response and Analysis Software (GADRAS) includes built-in alpha-neutron source definitions for AcC, AmB, AmBe, AmF, AmLi, CmC, and PuC. In addition, GADRAS users may create their own alpha-neutron sources by placing valid alpha-emitters and target elements in materials within their one-dimensional models (1DModel). GADRAS has the ability to use pre-built alpha-neutron sources for plotting or as trace-sources in 1D models. In addition, if any material (existing or user-defined) specified in a 1D model contains both an alpha emitter in conjunction with a target nuclide, or there is an interface between such materials, then the appropriate neutron-emission rate from the alpha-neutron reaction will be computed. The gamma-emissions from these sources are also computed, but are limited to a subset of nine target nuclides. If a user has experimental data to contribute to the alpha-neutron gamma emission database, it may be added directly or submitted to the GADRAS developers for inclusion. The gadras.exe.config file will be replaced when GADRAS updates are installed, so sending the information to the GADRAS developers is the preferred method for updating the database. This is also preferable because it enables other users to benefit from your efforts.

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TYPE SAND Report YEAR 2012
DOIOSTI

Pulsed-power driven inertial confinement fusion development at Sandia National Laboratories

Proposed for publication in 5th Special Issue of the IEEE Transactions on Plasma Science Z-Pinch Plasmas.

Cuneo, Michael E.; Mazarakis, Michael G.; Lamppa, Derek C.; Kaye, Ronald J.; Nakhleh, Charles; Bailey, James E.; Hansen, Stephanie B.; Mcbride, Ryan; Herrmann, Mark H.; Lopez, Andrew J.; Peterson, K.J.; Ampleford, David; Jones, Michael; Savage, Mark E.; Jennings, Christopher A.; Martin, Matthew R.; Slutz, Stephen A.; Lemke, Raymond W.; Christenson, Peggy J.; Sweeney, Mary A.; Jones, Brent M.; Yu, Edmund; Mcpherson, Leroy A.; Harding, Eric; Knapp, P.F.; Gomez, Matthew R.; Awe, Thomas J.; Stygar, William A.; Leeper, Ramon J.; Ruiz, Carlos L.; Chandler, Gordon A.; Mckenney, John; Owen, Albert C.; Mckee, G.R.; Matzen, M.K.; Leifeste, Gordon T.; Atherton, B.; Vesey, Roger A.; Smith, Ian C.; Geissel, Matthias; Rambo, Patrick K.; Sinars, Daniel; Sefkow, Adam B.; Rovang, Dean C.; Rochau, Gregory A.

Abstract not provided.

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TYPE Journal Article YEAR 2012
OSTIDOI

Penetrating radiography of imploding and stagnating beryllium liners on the Z accelerator

Physical Review Letters

Mcbride, Ryan; Peterson, K.J.; Sefkow, Adam B.; Nakhleh, Charles; Laspe, Amy R.; Lopez, Mike R.; Smith, Ian C.; Atherton, B.; Savage, Mark E.; Stygar, William A.; Slutz, Stephen A.; Rogers, Thomas; Jennings, Christopher A.; Sinars, Daniel; Cuneo, Michael E.; Herrmann, Mark H.; Lemke, Raymond W.; Martin, Matthew R.; Vesey, Roger A.

Abstract not provided.

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TYPE Journal Article YEAR 2012
OSTIDOI
Results 65401–65600 of 101,000
Results 65401–65600 of 101,000
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