The capacity of the M-User Binary Adder Channel, subjected to various restrictions of physical nature, is investigated. The underlying propagation media considered are (i) fiber-optical, with lossless coupling and Poisson statistics (ii) radio, under Rayleigh fading and (iii) radio with constant

Abstract, Considerable progress has been made recently on Kerr cells. In this paper the physical ground of this progress is examined. The optical defects of former Kerr cells were essentially due to the electric field distortions in the liquid proceeding from the space charges which attend

spectrum of LMR’s to demonstrate the neutronic feasibility of a wide range of transuranic management options ranging from efficient breeding to pure consumption. Core physics aspects of the development of a low sodium void worth bansuranic burner concept are desczibed. Neutronics pCrfOMMQCC paramdfxs

Background: Glioblastoma multiforme is the most common and most aggressive malign brain tumor. The 5-year survival rate after tumor resection and adjuvant chemoradiation is only 10 %, with almost all recurrences occurring in the initially treated site. Attempts to improve local control using a higher radiation dose were not successful so that alternative additive treatments are urgently needed. Given the strong rationale for hyperthermia as part of a multimodal treatment for patients with glioblastoma, non-invasive radio frequency (RF) hyperthermia might significantly improve treatment results. Methods: A non-invasive applicator was constructed utilizing the magnetic resonance (MR) spin excitation frequency for controlled RF hyperthermia and MR imaging in an integrated system, which we refer to as thermal MR. Applicator designs at RF frequencies 300 MHz, 500 MHz and 1GHz were investigated and examined for absolute applicable thermal dose and temperature hotspot size. Electromagnetic field (EMF) and temperature simulations were performed in human voxel models. RF heating experiments were conducted at 300 MHz and 500 MHz to characterize the applicator performance and validate the simulations. Results: The feasibility of thermal MR was demonstrated at 7.0 T. The temperature could be increased by ~11 °C in 3 min in the center of a head sized phantom. Modification of the RF phases allowed steering of a temperature

One might conclude that in deep submarine environments, where hydrostatic pressure is in excess of water's critical pressure, waterlmagma interaction does not produce expanding vapor and explosive behavior cannot occur. This conclu-sion is supported by the apparent paucity of hydroclastic material in samples recovered from deep submarine environments. Analog molten fuel-coolant inter-action (MFCI) experiments, however, demonstrate explosive dynamics for condi-tions where water is pressurized above its critical pressure before interaction; MFCI theory further indicates this explosive potential. Thermodynamic predic-tions show that the conversion of thermal to mechanical energy is only high enough to support explosive behavior for a narrow range of waterlmagma mass ratios. In submarine environments, apparent mass ratios are too high for explosive behavior, but effective mass ratios (those determined from the water and magma directly involved during interaction) depend upon characteristic times, deter-mined by the sound speed of the water and interface geometry. At high pressure, a supercritical fluid film grows at the waterlmagma contact surface and can become unstable. With instability the film oscillates, rapidly expanding and col-lapsing, with a periodicity of milliseconds or less. Each film collapse imparts kinetic energy into the magma, causing magma fragmentation, especially where quench contraction has weakened the magma. With fragmentation more magma surface area is exposed to water, and the film growth/collapse process escalates. When perturbed by some external pressure wave, the unstable film is prone to a detonation-like phenomenon that causes rapid, localized vapor expansion even at high ambient pressure. 1.

? What are the mechanisms behind stop-and-go traffic? Why are there several different kinds of congestion, and how are they related? Why do most traffic jams occur considerably before the road capacity is reached? Can a temporary reduction in the volume of traffic cause a lasting traffic jam? Under which

and remembered utility; that is, the way people feel about experiences in real-time and the way they remember their experiences after they are over. The participants in experiments in which a physical stimulus is varied generally provide profiles that are similar, both in level and in shape, and that respond

not vanish in that limit, even when the isobars exchange the same amount of heat. Therefore the violation of the second law inferred from Vignati’s calculation is merely apparent, being referred to a situation which is not (in principle) physically realisable. The essentials of the Vignati’s argument

ABSTRACT This paper discusses some of the unique regulatory conditions and operational challenges facing a team performing a thorium-232 cleanup in a commercially active environment, as well as the implemented and proposed solutions that can be applied to other programs, particularly those operating in an OSHA-regulated environment.

Like middle-men in physical commerce, middleagents support the flow of information in electronic commerce, assisting in locating and connecting the ultimate information provider with the ultimate information requester. Many different types of middleagents will be useful in realistic, large