M. A. Wall
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View article: Feeding Disorders
Feeding Disorders Open
Feeding disorders, including avoidant restrictive food intake disorder (ARFID) and pediatric feeding disorder (PFD), are complex conditions that can occur in isolation or together. Feeding disorders have detrimental effects on children's p…
View article: MoRu/Be multilayers for extreme ultraviolet applications
MoRu/Be multilayers for extreme ultraviolet applications Open
High reflectance, low intrinsic roughness and low stress multilayer systems for extreme ultraviolet (EUV) lithography comprise amorphous layers MoRu and crystalline Be layers. Reflectance greater than 70% has been demonstrated for MoRu/Be …
View article: "Burst-like" Characteristics of the delta/alpha-prime Phase Transformation in Pu-Ga Alloys
"Burst-like" Characteristics of the delta/alpha-prime Phase Transformation in Pu-Ga Alloys Open
The {delta} to {alpha}' phase transformation in Pu-Ga alloys is intriguing for both scientific and technological reasons. On cooling, the ductile fcc d-phase transforms martensitically to the brittle monoclinic {alpha}'-phase at approximat…
View article: Rampant changes in 5f 5/2 and 5f 7/2 filling across the light and middle actinide metals
Rampant changes in 5f 5/2 and 5f 7/2 filling across the light and middle actinide metals Open
We examine the branching ratio of the N{sub 4,5} (4d {yields} 5f ) spectra of Th, U, Np, Pu, Am, and Cm metal using electron energy-loss spectroscopy (EELS) in a transmission electron microscope (TEM), together with many-electron atomic sp…
View article: X-ray diffraction at the National Ignition Facility
X-ray diffraction at the National Ignition Facility Open
We report details of an experimental platform implemented at the National Ignition Facility to obtain in situ powder diffraction data from solids dynamically compressed to extreme pressures. Thin samples are sandwiched between tamper layer…
View article: Ultrafast dynamic response of single crystal β-HMX
Ultrafast dynamic response of single crystal β-HMX Open
We report results from ultrafast compression experiments conducted on β-HMX single crystals. Results consist of nominally 12 picosecond time-resolved wave profile data, (ultrafast time domain interferometry –TDI measurements), that were an…
View article: Author Contribution to the Pu Handbook II: Chapter 37 LLNL Integrated Sample Preparation Glovebox (TEM) Section
Author Contribution to the Pu Handbook II: Chapter 37 LLNL Integrated Sample Preparation Glovebox (TEM) Section Open
The development of our Integrated Actinide Sample Preparation Laboratory (IASPL) commenced in 1998 driven by the need to perform transmission electron microscopy studies on naturally aged plutonium and its alloys looking for the microstruc…
View article: Generalized Rate Theory for Void and Bubble Swelling and its Application to Delta-Plutonium
Generalized Rate Theory for Void and Bubble Swelling and its Application to Delta-Plutonium Open
A rate theory for void and bubble swelling is derived that allows both vacancies and self-interstitial atoms to be generated by thermal activation at all sinks. In addition, they can also be produced by displacement damage from external an…
View article: Isochronal annealing effects on local structure, crystalline fraction, and undamaged region size of radiation damage in Ga-stabilized <i>δ</i>-Pu
Isochronal annealing effects on local structure, crystalline fraction, and undamaged region size of radiation damage in Ga-stabilized <i>δ</i>-Pu Open
The effects on the local structure due to self-irradiation damage of Ga stabilized δ-Pu stored at cryogenic temperatures have been examined using extended x-ray absorption fine structure (EXAFS) experiments. Extensive damage, seen as a los…
View article: Solid oxide fuel cell power system development
Solid oxide fuel cell power system development Open
This report summarizes the progress made during this contractual period in achieving the goal of developing the solid oxide fuel cell (SOFC) cell and stack technology to be suitable for use in highly-efficient, economically-competitive, co…