5,948 research outputs found

    Problems of Classification

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    Modeling the electromagnetic properties of the SCUBA-2 detectors

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    SCUBA-2 is the next-generation replacement for SCUBA (Sub-millimetre Common User Bolometer Array) on the James Clerk Maxwell Telescope. Operating at 450 and 850 microns, SCUBA-2 fills the focal plane of the telescope with fully-sampled, monolithic bolometer arrays. Each SCUBA-2 pixel uses a quarter-wave slab of silicon with an implanted resistive layer and backshort as an absorber and a superconducting transition edge sensor as a thermometer. In order to verify and optimize the pixel design, we have investigated the electromagnetic behaviour of the detectors, using both a simple transmission-line model and Ansoft HFSS, a finite-element electromagnetic simulator. We used the transmission line model to fit transmission measurements of doped wafers and determined the correct implant dose for the absorbing layer. The more detailed HFSS modelling yielded some unexpected results which led us to modify the pixel design. We also verified that the detectors suffered little loss of sensitivity for off-axis angles up to about 30 degrees.Comment: 13 pages, 14 figures, SPIE Glasgow 21-25 June 2004, Conference 549

    The Alaska Marriage Amendment: The Peopleā€™s Choice on the Last Frontier

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    I Sverige beraĢˆknas 17 % av befolkningen ha en hoĢˆrselnedsaĢˆttning, vilket innebaĢˆr att det aĢˆr den vanligaste sensoriska funktionsnedsaĢˆttningen. Idag finns det en maĢˆngd studier som visar att hoĢˆrselnedsaĢˆttning aĢˆr relaterat till saĢˆmre psykisk haĢˆlsa. Acceptans av sin hoĢˆrselnedsaĢˆttning har visat sig vara positivt foĢˆr hoĢˆrselnedsatta och samvarierar med hjaĢˆlpsoĢˆkande. Acceptance and commitment therapy (ACT) aĢˆr en transdiagnostisk behandling daĢˆr psykopatologi antas bero paĢŠ en hoĢˆg grad av upplevelsemaĢˆssigt undvikande och fusion med tankar. MaĢŠlet i ACT aĢˆr att oĢˆka psykologisk flexibilitet daĢˆr acceptans aĢˆr en betydande komponent. Denna explorativa studie undersoĢˆkte foĢˆraĢˆndringsprocesser i ACT foĢˆr personer med hoĢˆrselnedsaĢˆttning daĢˆr utfallet var kaĢˆnslomaĢˆssig och social anpassning foĢˆr hoĢˆrselnedsaĢˆttningen (HHIE-S). De foĢˆraĢˆndringsprocesser som proĢˆvades var acceptans (HAQ), som tidigare visat paĢŠ medierande effekt foĢˆr ACT, samt tvaĢŠ alternativa foĢˆraĢˆndringsprocesser; self-efficacy (HSE-4) och upplevd stress (PSS-4). Behandlingen bestod av aĢŠtta internetadministrerade moduler givna med behandlarstoĢˆd daĢˆr veckovisa maĢˆtningar av foĢˆraĢˆndringsprocesser och utfall anvaĢˆndes. Studiens resultat visar att behandlingsgruppen upplevde marginellt signifikant mindre problem med kaĢˆnslomaĢˆssig och social anpassning foĢˆr hoĢˆrselnedsaĢˆttningen (HHIE-S). Studiens resultat pekar paĢŠ att hoĢˆrselrelaterad acceptans (HAQ) och self- efficacy (HSE-4) medierar behandlingens effekt paĢŠ deltagarnas kaĢˆnslomaĢˆssiga och sociala anpassning foĢˆr hoĢˆrselnedsaĢˆttning (HHIE-S). SaĢŠledes tillfoĢˆr denna studie ytterligare belaĢˆgg foĢˆr acceptans som foĢˆraĢˆndringsprocess i ACT. AĢˆven self-efficacy kan vara en intressant mediator att beakta i fortsatt forskning.

    Electronic spectra of simple main group inorganic and organometallic systems

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    The purpose underlying the researches described in this thesis is an attempt to understand the bonding and electronic structure of some simple inorganic and organometallic systems. The particular molecules chosen for study were the Selenium containing linear triatomic species OCSe, SCSe, CSeā‚‚ and the main group metallocenes M(Cā‚…Hā‚…)n n = 1, M = Tl & In ; n= 2, M =Pb, Sn &Hg.In all cases the technique of ultraviolet photoelectron spectroscopy was employed and the (vacuum) ultraviolet absorption spectra of OCSe, SCSe & CSeā‚‚ were also recorded. The major features of the photoelectron spectra were interpreted as arising from ionization from the filled valence levels obtained from simple schemes derived from Mulliken-Hund molecular orbital theory3. The absorption spectra were analysed in terms of transitions from these filled valence shell orbitals to the various empty valence and atomic like Rydberg4 orbitals of the molecule. In addition, weaker features in the photoelectron spectra of CSeā‚‚ and SCSe were attributed to formally forbidden one photon transitions involving simultaneous ionization and electronic excitation

    Transcript: Globalisation of the Hague Children\u27s Conventions with Emphasis on the Child Abduction Convention

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    Water transport through (7,7) carbon nanotubes of different lengths using molecular dynamics

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    Non-equilibrium molecular dynamics simulations are used to investigate water transport through (7,7) CNTs, examining how changing the CNT length affects the internal flow dynamics. Pressure-driven water flow through CNT lengths ranging from 2.5 to 50 nm is simulated. We show that under the same applied pressure difference an increase in CNT length has a negligible effect on the resulting mass flow rate and fluid flow velocity. Flow enhancements over hydrodynamic expectations are directly proportional to the CNT length. Axial profiles of fluid properties demonstrate that entrance and exit effects are significant in the transport of water along CNTs. Large viscous losses in these entrance/exit regions lead into central ā€œdevelopedā€ regions in longer CNTs where the flow is effectively frictionless
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