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A packing of spheres is taken as a suitable model of porous media. The packing may be regular and the sphere size may be uniform, but in general, both should be random. Approximations are developed to give the volumes and surface areas of pendular rings that exist at points of sphere contact....
The flow of neutrons slowing down into a given angular and lethargy (or energy) interval equals an integral over the contributions from neutrons at other angles and lethargies within the medium. The two angular dependences of the integrand are commonly expanded in Legendre polynomials, and for...
The infrared emission of Cu 2 O under electron‐bombardment was investigated. Lamps containing an electron‐bombarded Cu 2 O target emit a single band between 0.8 and 1.4 μ. They can be very accurately pulsed with the help of a built‐in grid. The efficiency at 6500 v is about 4 to 5% of the...
The first‐order linearized set of Maxwell‐Lorentz equations are used as basis for the derivation of a power conservation theorem describing the balance between the rf kinetic power and the rf electromagnetic power in the electron beam. The theorem applies to laminar electron beams in which...
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