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10 papers · 1 filter
Note on Signature Change and Colombeau Theory
Tevian Dray, George Ellis, Charles Hellaby
Recent work alludes to various `controversies' associated with signature change in general relativity. As we have argued previously, these are in fact disagreements about the (ofte…
When Can You Fold a Map?
Esther M. Arkin, Michael A. Bender, Erik D. Demaine +4
We explore the following problem: given a collection of creases on a piece of paper, each assigned a folding direction of mountain or valley, is there a flat folding by a sequence…
Measurement of the Charged Pion Electromagnetic Form Factor
J. Volmer
Separated longitudinal and transverse structure functions for the reaction 1H(e,eprime pi+)n were measured in the momentum transfer region Q2=0.6-1.6 (GeV/c)**2 at a value of the i…
A birational invariant for algebraic group actions
Zinovy Reichstein, Boris Youssin
We construct a birational invariant for certain algebraic group actions. We use this invariant to classify linear representations of finite abelian groups up to birational equivale…
Monte Carlo study of the scattering error of a quartz reflective absorption tube
Jacek Piskozub, Piotr J. Flatau, J. V. R. Zaneveld
A Monte Carlo model was used to study the scattering error of an absorption meter with a divergent light beam and a limited acceptance angle of the receiver. Reflections at both en…
Remote sensing of bubble clouds in seawater
Piotr J. Flatau, Maria Flatau, J. R. V. Zaneveld +1
We report on the influence of submerged bubble clouds on the remote sensing properties of water. We show that the optical effect of bubbles on radiative transfer and on the estimat…