83 research outputs found
Overcritical states of a superconductor strip in a magnetic environment
A current-carrying superconducting strip partly penetrated by magnetic flux
and surrounded by a bulk magnet of high permeability is considered. Two types
of samples are studied: those with critical current controlled by an edge
barrier dominating over the pinning, and those with high pinning-mediated
critical current masking the edge barrier.It is shown for both cases that the
current distribution in a central flux-free part of the strip is strongly
affected by the actual shape of the magnetic surroundings. Explicit analytical
solutions for the sheet current and self-field distributions are obtained which
show that, depending on the geometry, the effect may suppress the total
loss-free transport current of the strip or enhance it by orders of magnitude.
The effect depends strongly on the shape of the magnet and its distance to the
superconductor but only weakly on the magnetic permeability.Comment: 20 pages, 20 figure
Magnetization of 2212 melt material before and after irradiation with 400 Mev oxygen ions
Enhancement of critical current in melt processed Bi2Sr2CaCu2O8 by irradiation with 400 MeV oxygen ions
Enhancement of critical current in melt processed Bi2Sr2CaCu2O8 by irradiation with 400 MeV oxygen ions
The experiments presented in this thesis examined the role of opioids in sexual pleasure, particularly during early formative sexual experiences, on the ability of male rats to associate an olfactory or somatosensory cue with their ejaculation-induced sexual reward state. The results show that opioids are an important substrate of the sexual reward state, and that this state feeds forward to form a conditioned ejaculatory preference (CEP), in which male rats ejaculate preferentially with females bearing or wearing the cue associated with sexual reward. This suggests that sexual reward (a presumably “proximate” cause of behavior) lies at the root of monogamous mate choice in the rat. These data also contribute to a growing body of evidence that the species’ specific sexual strategies of the male rat, often described as promiscuous, evidence a degree of plasticity that can move toward a monogamous mate choice when features of a familiar female (odor or jacket) are associated with sexual pleasure. This conditioned ejaculatory preference for familiar cues suggests that proximate pleasure-related states act as a Pavlovian US that can reinforce cue-related CSs to create partner and mate preferences. Such preferences bring proximate reward states into synch with reproductive choice, potentially enhancing reproductive success. Findings are discussed, as well as further directions
Low-pressure large-area magnetron sputter deposition of YBa2Cu3O7-delta films for industrial applications
Enhancement of critical current in melt processed Bi2Sr2CaCu2O8 by irradiation with 400 MeV oxygen ions
Flux line pinning in Bi2Sr2Ca1Cu2Ox crystals interplay of intrinsic 2D behavior and irradiation induced columnar defects
Correlation of flux line pinning and irradiation damage in Bi 2212 single crystals after 0.5 GeV iodine irradiation
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