George Backus

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  • George Backus
  • Proceedings of the National Academy of Sciences…
  • 1970
Having measured D numerical properties of a physical object E which requires many more than D parameters for its complete specification, an observer seeks to estimate P other numerical properties of E. This paper describes how he can proceed when E is adequately described by one member m(E) of a Hilbert space [unk] of possible models of E, when he believes(More)
  • George Backus
  • Proceedings of the National Academy of Sciences…
  • 1975
From the gross conservation laws of thermodynamics in a convecting material we derive a bound on the ratio of the rate of production of mechanical or magnetic energy to the rate of internal radioactive heating which drives the convection. Our bound for this "efficiency" depends on the temperatures in the material, and can exceed unity. Whether the bound can(More)
  • George Backus
  • Proceedings of the National Academy of Sciences…
  • 1970
Having measured D numerical properties of a physical object E which requires many more than D parameters for its complete description, we want to estimate P other numerical properties of E. Continuing the discussion in papers I(1) and II,(2) the present paper gives estimates when we believe it likely that we can guess an upper bound M on the Hilbert norm(More)
  • George Backus
  • Proceedings of the National Academy of Sciences…
  • 1970
Having measured D numerical properties of a physical object E which requires many more than D parameters for its complete specification, an observer seeks to estimate P other numerical properties of E. A previous paper discussed how he can proceed when E is adequately described by one member m(E) of a Hilbert space [unk] of possible models of E and when all(More)
  • George Backus
  • Proceedings of the National Academy of Sciences…
  • 1987
Every isotropic probability measure on the space R(infinity) of real sequences x = (x(1), x(2),...) is a convex combination of the measure concentrated at 0 and a member of I(0)(R(infinity)), the set of all isotropic probability measures p(infinity) on R(infinity) with p(infinity)({0}) = 0. Each p(infinity) [unk] I(0)(R(infinity)) is completely determined(More)
A~tract--The theory of group velocity is generalized to waves on curved surfaces, and applied to calculating the effect of the earth's rotation on the trajectory and wave vector of a wave packet whose waves have lengths much less than the radius of the earth and periods much less than one day. A geometrical description of the perturbed trajectory is given.(More)
A system dynamics model is developed to describe how insurgency groups pursue funding for their operations and the choices they make in how they allocate these funds to maintain their operations and advance their causes. The model illustrates that the insurgent groups, under survival pressure, will seek necessary resources to continue their operations by(More)