| 1. |
- Aamodt, K., et al.
(författare)
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Alignment of the ALICE Inner Tracking System with cosmic-ray tracks
- 2010
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Ingår i: Journal of Instrumentation. - 1748-0221. ; 5
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Konferensbidrag (refereegranskat)abstract
- ALICE (A Large Ion Collider Experiment) is the LHC (Large Hadron Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 mu m in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from proton-proton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10(5) charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.
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| 2. |
- Mapelli, A., et al.
(författare)
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Development of a detector (ALFA) to measure the absolute LHC luminosity at ATLAS
- 2008
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Ingår i: Astroparticle, Particle and Space Physics, Detectors and Medical Physics Applications - Proceedings of the 10th Conference. - 9812819088 - 9789812819086 ; , s. 984-988
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Konferensbidrag (refereegranskat)abstract
- The ATLAS collaboration plans to determine the absolute luminosity of the CERN LHC at Interaction Point 1 by measuring the trajectory of protons elastically scattered at very small angles (μrad). A scintillating fibre tracker system called ALFA (Absolute Luminosity For ATLAS) is proposed for this measurement. Detector modules will be placed above and below the LHC beam axis in roman pot units at a distance of 240 m on cach side of the ATLAS interaction point. They allow the detectors to approach the beam axis to millimeter distance. Overlap detectors also based on the scintillating fibre technology, will measure the precise relative position of the two detector modules, Results obtained during beam tests at DESY and at CERN validate the detectors design and demonstrate the achievable resolution. We also report about radiation hardness studies of the scintillating fibres to estimate the lifetime of the ALFA system at different operating conditions of the LHC.
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| 4. |
- Seo, S. W., et al.
(författare)
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Monolithically integrated InP photonic micro systems on a chip for O-CDMA and OAWG applications
- 2007
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Ingår i: 2007 Photonics in Switching, PS. - 142441122X - 9781424411221 ; , s. 97-98
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Konferensbidrag (refereegranskat)abstract
- A monolithically integrated InP chip for optical arbitrary waveform generation (OAWG) and/or pulse-coding/decoding is demonstrated using a 20-GHz AWG pair and 10 high-speed phase modulators. The fabrication and performance of the InP chip will be presented.
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| 7. |
- Ferreira, J, et al.
(författare)
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Portuguese version of the Disgust Propensity and Sensitivity Scale-Revised: Preliminary data
- 2016
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Ingår i: EUROPEAN PSYCHIATRY. - : Cambridge University Press (CUP). - 0924-9338 .- 1778-3585. ; 33, s. S223-S224
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Disgust propensity (DP) and disgust sensitivity (DS) contribute to individual differences in the experience of disgust. Studies have shown that DP and DS are predictive of some anxiety (e.g., spider phobia and blood-injection-injury phobia) and obsessive-compulsive and related disorders.AimThe aim of this study was to develop and validate a Portuguese version of the Disgust Propensity and Sensitivity Scale-Revised (DPSS-R; van Overveld= et al., 2006) for use in Portuguese-speaking populations.MethodTwo hundred and six participants (162 females), with ages between 18 and 47 (M = 25.92; SD = 8.75), filled in the DPSS-R, which was first translated and adapted into Portuguese language by individuals highly proficient in English and then back-translated by a bilingual with no prior knowledge of the scale. Finally, the DPSS-R was subjected to a think-aloud procedure.ResultsThe results showed good internal consistency (Cronbach's alfa = .833) for a DPSS-R. The two subscales displayed an adequate internal consistency (DPCronbach'salfa = .776; DSCronbach'salfa = .790). Test-retest analysis documented good intraclass correlation coefficient for the two subscales (ICCPropensity = .889; ICC Sensitivity = .900). We also confirmed the bifactorial structure using a confirmatory factor analysis, since we obtained appropriate values in all goodness of fit indices (χ2df = 1,906; CFI = .94; PCFI = .736; GFI = .93; PGFI = .607; RMSEA = .067).ConclusionDPSS-R obtained good psychometric properties and may therefore be proposed as a valid instrument to assess DS and DP in the Portuguese population. This instrument may provide an important contribute to study the development and maintenance of psychopathology associated with disgust.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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| 8. |
- Gomes, N, et al.
(författare)
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The advantage of fear stimuli in accessing visual awareness
- 2016
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Ingår i: EUROPEAN PSYCHIATRY. - : Cambridge University Press (CUP). - 0924-9338 .- 1778-3585. ; 33, s. S373-S373
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Several studies have shown that evolutionary relevant fear stimuli hold a privileged access to the fear module, an independent behavioral, psychophysiological and neural system that is automatically and selectively activated, and is relatively encapsulated from more advanced human cognition. However, to the best of our knowledge no study has yet directly assessed whether such stimuli are granted a facilitated access to visual awareness, compared to stimuli without such evolutionary relevance.ObjectiveIn the present study we used an interocular suppression technique, the Continuous Flash Suppression, known to reduce the activity along the geniculostriate pathway and to strongly suppress processing in the visual cortex.AimOur goal was to investigate whether ecologically relevant fear stimuli (snakes and spiders) overcame suppression and accessed awareness to a larger extent than non-evolutionary relevant animal stimuli (birds).MethodThirty university students volunteered to participate. Participants were asked to identify the screen quadrant in which the stimulus was presented in order to ensure that there was indeed a conscious processing.ResultsThe results confirmed our hypothesis by showing an advantage of fear stimuli (snakes and spiders) over the control stimulus (birds) in emerging from suppression into awareness, which was evidenced by significantly shorter response times.ConclusionsOur findings support the notion that evolutionary relevant stimuli hold a privileged access into awareness, most likely involving a direct brainstem-thalamic route to the amygdala. Importantly, they contribute to elucidate the functions and mechanisms of the fear system and may have important implications for understanding emotional disorders, since many of these involve the fear system.Disclosure of interestThe authors have not supplied their declaration of competing interest.
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| 9. |
- Soares, Ruben R. G., et al.
(författare)
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Towards point-of-care HIV diagnostics using dual-labelled rolling circle products for efficient capture and detection in a microfluidic device
- 2019
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Ingår i: 23rd International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2019. - : Chemical and Biological Microsystems Society. ; , s. 734-735
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Konferensbidrag (refereegranskat)abstract
- HIV infections are devastating in resource-limited settings, where portable, fit-for-purpose and affordable diagnostic devices would allow effective monitoring of infection spread and aid therapeutics. Here, a rolling circle amplification (RCA)-based assay using multiple specific padlock probes (PLP) targeting a conserved pol gene of HIV-1 subtype B is presented. These PLPs were designed to allow (1) fluorescence detection of the rolling circle products (RCP), as well as (2) their specific capture in a microfluidic device resorting to streptavidin-biotin interactions. The device provided detection limits as low as 10 fM and allowed the detection of HIV in infected 293T cell culture supernatants.
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