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Calibration of Thermal Desorption System (TDS) Response to Hydrogen for Analysis of Titanium Subhydride and Titanium Hydride

Mills, Bernice E.

The equipment and method for and results of calibration of the Sandia/CA TDS system for hydrogen quantification is presented. This technique for calibration can be used to quantify the hydrogen content titanium subhydride, titanium hydride, and any other hydrogen-containing material that desorbs its hydrogen in the form of molecular hydrogen below 1450°C.

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TYPE SAND Report YEAR 2013
DOIOSTI

Resource requirements for the large-scale production of algal biofuels

Biofuels

Pate, Ronald C.

Microalgae continue to be of great interest as a promising class of biofuel feedstock, with the potential for contributing to liquid transportation fuel supplipes while reducing GHG emissions and dependence on imported petroleum through the displacement of petroleum-based fuel and chemical product usage. However, to significantly contribute to fuel supplies will require that algal biofuels be capable of scaling up to large aggregated quantities of biomass and fuel feedstock production that necessarily impose huge demands for land, water, energy, supplemental CO2 and other key nutrients such as nitrogen and phosphorus. The resulting resource requirements will also impose constraints on the level of production scale-up that can be sustainably supported. This paper provides a high-level review of the current status and future prospects for these key resource demand and constraint challenges for the scale-up of autotrophic microalgal biofuel production. Emphasis is placed on the USA, although the issues are generally relevant globally. © 2013 Future Science Ltd.

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TYPE Presentation YEAR 2013
DOIOSTIScopus

Comparing Algorithms for Graph Isomorphism Using Discrete- and Continuous-Time Quantum Random Walks

Journal of Computational and Theoretical Nanoscience

Rudinger, Kenneth M.; Foulk, James W.; Bach, Eric; Friesen, Mark; Joynt, Robert; Coppersmith, S.N.

Berry and Wang [Phys. Rev. A 83, 042317 (2011)] show numerically that a discrete-time quan- tum random walk of two noninteracting particles is able to distinguish some non-isomorphic strongly regular graphs from the same family. Here we analytically demonstrate how it is possible for these walks to distinguish such graphs, while continuous-time quantum walks of two noninteracting parti- cles cannot. We show analytically and numerically that even single-particle discrete-time quantum random walks can distinguish some strongly regular graphs, though not as many as two-particle noninteracting discrete-time walks. Additionally, we demonstrate how, given the same quantum random walk, subtle di erences in the graph certi cate construction algorithm can nontrivially im- pact the walk's distinguishing power. We also show that no continuous-time walk of a xed number of particles can distinguish all strongly regular graphs when used in conjunction with any of the graph certi cates we consider. We extend this constraint to discrete-time walks of xed numbers of noninteracting particles for one kind of graph certi cate; it remains an open question as to whether or not this constraint applies to the other graph certi cates we consider.

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TYPE Journal Article YEAR 2013
DOIOSTI
Results 57501–57600 of 99,299
Results 57501–57600 of 99,299