389 research outputs found
SNAP-8 materials report for July - December 1965
Materials evaluation for components of SNAP-8 SYSTEM - design, development, fabrication, and testin
SNAP-8 materials report for January - June 1965
Corrosion resistance of molybdenum-chromium steel in mercury forced convection corrosion loop for nuclear auxiliary power system component
SNAP-8 materials report for January - June 1964. Volume II - Development of component material
System fluids, boiler materials, condenser tube to tube sheet joint, turbine rotor and nozzle materials, and mercury corrosion loop program - SNAP-
Snap-8 mercury corrosion and materials research, volume iii topical report, jun. 1960 - dec. 1962
SNAP-8 materials research - mercury corrosion capsule tests of ferritic alloys for mass transfer, stress corrosion, mode of attack, and mechanical propertie
Evaluation of tantalum for mercury containment in the SNAP-8 boiler
Corrosion testing of tantalum for mercury containment in SNAP 8 boile
A 9Cr-1Mo steel as a mercury containment material for the SNAP-8 boiler
9Cr-1Mo steel as mercury containment material for SNAP-8 boile
Physics in Riemann's mathematical papers
Riemann's mathematical papers contain many ideas that arise from physics, and
some of them are motivated by problems from physics. In fact, it is not easy to
separate Riemann's ideas in mathematics from those in physics. Furthermore,
Riemann's philosophical ideas are often in the background of his work on
science. The aim of this chapter is to give an overview of Riemann's
mathematical results based on physical reasoning or motivated by physics. We
also elaborate on the relation with philosophy. While we discuss some of
Riemann's philosophical points of view, we review some ideas on the same
subjects emitted by Riemann's predecessors, and in particular Greek
philosophers, mainly the pre-socratics and Aristotle. The final version of this
paper will appear in the book: From Riemann to differential geometry and
relativity (L. Ji, A. Papadopoulos and S. Yamada, ed.) Berlin: Springer, 2017
Stringy Toda Cosmologies
We discuss a particular stringy modular cosmology with two axion fields in
seven space-time dimensions, decomposable as a time and two flat three-spaces.
The effective equations of motion for the problem are those of the Toda
molecule, and hence are integrable. We write down the solutions, and show that
all of them are singular. They can be thought of as a generalization of the
Pre-Big-Bang cosmology with excited internal degrees of freedom, and still
suffering from the graceful exit problem. Some of the solutions however show a
rather unexpected property: some of their spatial sections shrink to a point in
spite of winding modes wrapped around them. We also comment how more general,
anisotropic, solutions, with fewer Killing symmetries can be obtained with the
help of STU dualities.Comment: 22 pages, latex, no figures. Several minor typos correcte
The medical student
The Medical Student was published from 1888-1921 by the students of Boston University School of Medicine
Human Computer Interaction Meets Psychophysiology: A Critical Perspective
Human computer interaction (HCI) groups are more and more often exploring the utility of new, lower cost electroencephalography (EEG) interfaces for assessing user engagement and experience as well as for directly controlling computers. While the potential benefits of using EEG are considerable, we argue that research is easily driven by what we term naïve neurorealism. That is, data obtained with psychophysiological devices have poor reliability and uncertain validity, making inferences on mental states difficult. This means that unless sufficient care is taken to address the inherent shortcomings, the contributions of psychophysiological human computer interaction are limited to their novelty value rather than bringing scientific advance. Here, we outline the nature and severity of the reliability and validity problems and give practical suggestions for HCI researchers and reviewers on the way forward, and which obstacles to avoid. We hope that this critical perspective helps to promote good practice in the emerging field of psychophysiology in HCI
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