Saturn S-2 quality assurance techniques: Nondestructive testing processes. Volume 1: Requirements and procedures

The methods and procedures used to perform nondestructive testing inspections of the Saturn S-2 liquid hydrogen and liquid oxygen tank weldments during fabrication and after proof testing are described to document special skills developed during the program. All post-test inspection requirements are outlined including radiographic inspections procedures

An Evaluation of a Development Program for New Principals

The evaluation of a program designed to assist principals recently appointed to their positions is the focus of this article. Researchers conducted a variety of qualitative assessments including focus group interviews, a review of training session feedback forms, participant reflective writing, and an assessment of training materials and program agendas. Researchers analyzed this data to look for aspects of participant knowledge, skills, and applications of program information. Participant feedback provided insights into program benefits and needed refinements. Article provides insights into assessment tools that people responsible for delivering principal support programs could consider to provide them with a more comprehensive examination of their program than traditional session feedback forms provide. Article also provides program recommendations that other program designers could consider to improve their existing principal support programs

The Trail of Courage: A Mini-Ethnographic Case Study Exploring the Feasibility and Acceptability of Integrated Equine-Assisted Therapy (IEAT) on Yazidi Adolescent Girl Wellbeing

In 2018, the Nobel Peace Prize was awarded to Nadia Murad, a Yazidi woman who captured the attention of the world with her story of survival from the combatant and abusive hands of ISIS. Murad used her voice to speak out against wartime sexual assault and in doing so, has supported the wellbeing of women and girls around the world. A Goodwill Ambassador, her example and work has visibilized their trail of courage and lifted up the importance of work to support their wellbeing. This research, in albeit a very small way, seeks to follow Murad’s path. Though literature abounds on the concept of wellbeing, there is a dearth in literature on wellbeing from the Yazidi perspective. Through a rigorous secondary analysis of program data, this mini-ethnographic case study contributes a rich understanding of wellbeing according from the Yazidi adolescent girl perspective, identifies protective factors supporting their resilience, and evaluates the feasibility and acceptability of the Integrated Equine-Assisted Therapy (IEAT) framework. Results from this study have implications for the practice of and policy surrounding equine therapy as well as complementary support services for Yazidi adolescents in the United States and abroad. Additionally, findings may serve to further the knowledge base on Yazidi adolescent wellbeing and on the use of IEAT in work with Yazidi and other adolescent survivors of trauma. Adviser: Yan Xi

Interactive effects of elevated temperature and CO2 on two phylogeographically distinct clones of common reed (Phragmites australis)

The aboveground growth, physiological and biochemical parameters of two clones of the cosmopolitan wetland grass Phragmites australis, grown at four treatment combinations of temperature and O2, were investigated to elucidate whether their climate response differed due to inherent differences in their ecological adaptation. The two phylogeographically distinct P. australis clones (DK clone, European genetic background; ALG clone, Mediterranean genetic background) were grown for 151 days in phytotrons at 19/12 8C (day/night temperature) and 390 ppm CO2, and at elevated temperature (+5 8C) and CO2 (700 ppm) with treatment factors alone or in combination. The ALG clone had 2–4 times higher aboveground biomass, higher light-saturated rates of photosynthesis (Pmax), maximum electron transport rates (ETRmax) and Rubisco activity, and higher photosynthetic nitrogen-use efficiency than the DK clone. The DK clone, however, produced more shoots, leaves and sideshoots, and had 9–51 % higher specific leaf area and 15–39 % higher leaf nitrogen concentration than the ALG clone. Although elevated atmospheric CO2 alone barely affected the aboveground growth of the two P. australis clones, simultaneously elevated temperature and CO2 stimulated growth and aboveground biomass. Overall, elevated CO2 stimulated photosynthesis, but the clones responded differently to a concomitant increase in CO2 and temperature, depending on the phylogeographic background of the plant. The DK clone showed overall stronger responses, and can be considered the more plastic of the two clones with respect to CO2 and temperature. Thus, the DK clone may be better adapted to climate change than the ALG clone, at least in the short term

The Vacuum in Light-Cone Field Theory

This is an overview of the problem of the vacuum in light-cone field theory, stressing its close connection to other puzzles regarding light-cone quantization. I explain the sense in which the light-cone vacuum is ``trivial,'' and describe a way of setting up a quantum field theory on null planes so that it is equivalent to the usual equal-time formulation. This construction is quite helpful in resolving the puzzling aspects of the light-cone formalism. It furthermore allows the extraction of effective Hamiltonians that incorporate vacuum physics, but that act in a Hilbert space in which the vacuum state is simple. The discussion is fairly informal, and focuses mainly on the conceptual issues. [Talk presented at {\sc Orbis Scientiae 1996}, Miami Beach, FL, January 25--28, 1996. To appear in the proceedings.]Comment: 20 pages, RevTeX, 4 Postscript figures. Minor typos correcte

Simulation of 3D Porous Media Flows with Application to Polymer Electrolyte Fuel Cells

A 3D lattice Boltzmann (LB) model with twenty-seven discrete velocities is presented and used for the simulation of three-dimensional porous media flows. Its accuracy in combination with the half-way bounce back boundary condition is assessed. Characteristic properties of the gas diffusion layers that are used in polymer electrolyte fuel cells can be determined with this model. Simulation in samples that have been obtained via X-ray tomographic microscopy, allows to estimate the values of permeability and relative effective diffusivity. Furthermore, the computational LB results are compared with the results of other numerical tools, as well as with experimental value

Sonoluminescing air bubbles rectify argon

The dynamics of single bubble sonoluminescence (SBSL) strongly depends on the percentage of inert gas within the bubble. We propose a theory for this dependence, based on a combination of principles from sonochemistry and hydrodynamic stability. The nitrogen and oxygen dissociation and subsequent reaction to water soluble gases implies that strongly forced air bubbles eventually consist of pure argon. Thus it is the partial argon (or any other inert gas) pressure which is relevant for stability. The theory provides quantitative explanations for many aspects of SBSL.Comment: 4 page

Energy metabolism and ketogenic diets: What about the skeletal health? a narrative review and a prospective vision for planning clinical trials on this issue

The existence of a common mesenchymal cell progenitor shared by bone, skeletal muscle, and adipocytes cell progenitors, makes the role of the skeleton in energy metabolism no longer surprising. Thus, bone fragility could also be seen as a consequence of a “poor” quality in nutrition. Ketogenic diet was originally proven to be effective in epilepsy, and long-term follow-up studies on epileptic children undergoing a ketogenic diet reported an increased incidence of bone fractures and decreased bone mineral density. However, the causes of such negative impacts on bone health have to be better defined. In these subjects, the concomitant use of antiepileptic drugs and the reduced mobilization may partly explain the negative effects on bone health, but little is known about the effects of diet itself, and/or generic alterations in vitamin D and/or impaired growth factor production. Despite these remarks, clinical studies were adequately designed to investigate bone health are scarce and bone health related aspects are not included among the various metabolic pathologies positively influenced by ketogenic diets. Here, we provide not only a narrative review on this issue, but also practical advice to design and implement clinical studies on ketogenic nutritional regimens and bone health outcomes. Perspectives on ketogenic regimens, microbiota, microRNAs, and bone health are also included