Density of states in d-wave superconductors disordered by extended impurities

The low-energy quasiparticle states of a disordered d-wave superconductor are investigated theoretically. A class of such states, formed via tunneling between the Andreev bound states that are localized around extended impurities (and result from scattering between pair-potential lobes that differ in sign) is identified. Its (divergent) contribution to the total density of states is determined by taking advantage of connections with certain one-dimensional random tight-binding models. The states under discussion should be distinguished from those associated with nodes in the pair potential.Comment: 5 pages, 1 figur

Optically enhanced mobility in a persistent photoconduction state

Illumination enhances the carrier mobility in semiconductors within the regime of impurity scattering because the excess photogenerated electron-hole pairs screen the ionized impurities. Quantitative agreement with the Brooks-Herring theory is shown to be possible only by proper consideration of the persistent-photoconductivity phenomenon, which leads to a widening of the conductive layer in epitaxial material. © 1983 The American Physical Society

Light-Induced Mobility Transition in Silicon

A very sharp, reversible change in magnitude of the electron mobility is detected by photo-Hall effect in inhomogeneous, oxygen-doped silicon specimens. The transition temperature rises with increasing illumination flux. The light creates carriers, which neutralize charged impurities and hence reduce potential fluctuations and raise mobility. © 1987 The American Physical Society

Semiconductor heterointerface characterisation via effective harmonic oscillator simulation

The persistent photoconductivity (PP) measurements concerning the two‐dimensional electron gas (2DEG) hosted by the quantum well (QW) of an illuminated typical semiconductor heterojunction (HJ) are processed to yield the respective heterointerface (HI) characterisation in terms of fundamental parameters identifying the HJ QW. The procedure involves the employment of an effective harmonic oscillator as simulating the QW electron‐confining potential, as well as the introduction of a HI descriptor incorporating the QW spatial width along with the generic oscillator eigenfrequency. Copyright © 1995 WILEY‐VCH Verlag GmbH & Co. KGa

The inner morphology of the petrosal bone of the endemic elephant of tilos island, greece

The bony labyrinth, as part of the inner structure of the petrosal bone, contains the sensory organs of balance and hearing. The semicircular canals, as part of the vestib-ular apparatus of the inner ear, are involved in the detection of angular motion of the head for maintaining balance and guiding locomotor behavior. While the overall structure of the bony labyrinth is inaccessible embedded in the petrosal bone, high resolu-tion computed tomography makes the study of these structures possible. The purpose of this study is to visualize and precisely quantify the complex inner ear structures of the insular mammal Palaeoloxodon tiliensis and comment on the relationship of these morphologies to the agility and hearing frequency ranges. This study focuses on imaging the shape of the bony labyrinth as well as the semicircular canals, of three petrosal bones, using micro-computed tomography (micro-CT). Shape and size analysis of the cochlea allow for an assessment of morphological differences between species. Spe-cifically, measuring the dimensions of inner ear components as well as the angular dis-tances can express the variation in their balancing abilities and the frequencies of their auditory perception. The morphological characteristics obtained through micro-CT lead to the conclusion that P. tiliensis retained similar conditions to that of its larger relatives, and it was an animal that had hearing in the low frequency ranges. © June 2021 Society of Vertebrate Paleontology

Room temperature persistent photoconductivity in GaP:S

The build-up and the decay of persistent photoconductivity (PP) have been measured at room temperature in GaP. The PP effect in our samples is attributed to the existence of defect clusters in the bulk material. Irradiation of the samples with α-particles generates defect clusters and enhances further the PP effect. Persistent photoconductivity at room temperature may have technical applications i.e. photon dose meters and image storage. © 1997 Elsevier Science Ltd

Arabidopsis FHY3 specifically gates phytochrome signaling to the circadian clock

Circadian gating of light signaling limits the timing of maximum responsiveness to light to specific times of day. The fhy3 (for far-red elongated hypocotyl3) mutant of Arabidopsis thaliana is involved in independently gating signaling from a group of photoreceptors to an individual response. fhy3 shows an enhanced response to red light during seedling deetiolation. Analysis of two independent fhy3 alleles links enhanced inhibition of hypocotyl elongation in response to red light with an arrhythmic pattern of hypocotyl elongation. Both alleles also show disrupted rhythmicity of central-clock and clock-output gene expression in constant red light. fhy3 exhibits aberrant phase advances under red light pulses during the subjective day. Release-from-light experiments demonstrate clock disruption in fhy3 during the early part of the subjective day in constant red light, suggesting that FHY3 is important in gating red light signaling for clock resetting. The FHY3 gating function appears crucial in the early part of the day for the maintenance of rhythmicity under these conditions. However, unlike previously described Arabidopsis gating mutants that gate all light signaling, gating of direct red light–induced gene expression in fhy3 is unaffected. FHY3 appears to be a novel gating factor, specifically in gating red light signaling to the clock during daytime

Presence or absence of anaerobic fungi in landfill refuse

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