Search results for "Methods"

Mapping of the magnetic field to correct systematic effects in a neutron electric dipole moment experiment

2021

Experiments dedicated to the measurement of the electric dipole moment of the neutron require outstanding control of the magnetic-field uniformity. The neutron electric dipole moment (nEDM) experiment at the Paul Scherrer Institute uses a Hg199 co-magnetometer to precisely monitor temporal magnetic-field variations. This co-magnetometer, in the presence of field nonuniformity, is, however, responsible for the largest systematic effect of this measurement. To evaluate and correct that effect, offline measurements of the field nonuniformity were performed during mapping campaigns in 2013, 2014, and 2017. We present the results of these campaigns, and the improvement the correction of this eff…

Accountability in couple therapy for depression : a mixed methods study in a naturalistic setting in Finland

2013

Modeling friction between shearing brittle surfaces with a discrete element method

2018

Hauraiden materiaalien murtuminen on eräs materiaalifysiikan peruskysymyksistä. Sille ei ole vieläkään olemassa täydellistä teoreettista selitystä, joten ennusteiden tekeminen nojaa vahvasti kokeisiin ja niihin perustuviin numeerisiin malleihin. Tässä työssä suunnittelemme ja toteutamme diskreettielementtimenetelmän sellaisen fysikaalisen systeemin tutkimiseen, jossa kaksi haurasta pintaa leikkaavat toisiaan. Keskitymme erityisesti siihen kuinka erilaiset voimamallit sisäiselle kitkalle vaikuttavat materiaalin ulkoiseen kitkaan. Käyttämällä graniittia koemateriaalina huomaamme, että sen ulkoinen kitka riippuu voimakkaasti sen sisäisestä kitkasta, kun ulkoinen paine on lähellä materiaalin pu…

A coupled discontinuous Galerkin-Finite Volume framework for solving gas dynamics over embedded geometries

2021

Author(s): Gulizzi, Vincenzo; Almgren, Ann S; Bell, John B | Abstract: We present a computational framework for solving the equations of inviscid gas dynamics using structured grids with embedded geometries. The novelty of the proposed approach is the use of high-order discontinuous Galerkin (dG) schemes and a shock-capturing Finite Volume (FV) scheme coupled via an $hp$ adaptive mesh refinement ($hp$-AMR) strategy that offers high-order accurate resolution of the embedded geometries. The $hp$-AMR strategy is based on a multi-level block-structured domain partition in which each level is represented by block-structured Cartesian grids and the embedded geometry is represented implicitly by a…

Comparison between different mathematical methods to calcolate insulin resistance in women with polycystic ovary syndrome (PCOS)

2003

Influencia de la velocidad de nombramiento en el inicio de la lectura

2016

Abstract:The analysis of the cognitive processes that are the basis of reading skill has detected some predictors of the development of phonological-orthographic skills necessary in learning it and has identified the naming speed as a good predictor of deficit related to reading difficulties. The objective of this study is to analyze the relationship between naming speed and initial learning of literacy through the analysis of aspects such as the influence of the reading habits, age of onset of literacy or participation in specific learning methods as Kumon. The study involved 289 children aged 4 to 6 years. Results showed naming speed correlates with phonological awareness, predicts readin…

A survey on sleep assessment methods

2018

Purpose A literature review is presented that aims to summarize and compare current methods to evaluate sleep. Methods Current sleep assessment methods have been classified according to different criteria; e.g., objective (polysomnography, actigraphy…) vs. subjective (sleep questionnaires, diaries…), contact vs. contactless devices, and need for medical assistance vs. self-assessment. A comparison of validation studies is carried out for each method, identifying their sensitivity and specificity reported in the literature. Finally, the state of the market has also been reviewed with respect to customers’ opinions about current sleep apps. Results A taxonomy that classifies the sleep detect…

Informal situated counselling in a school context†

2008

The institutional regulation of counselling conversations does not always provide optimal conditions for counselling. Many teachers experience that some “normal” conversations develop into conversations which are of a counselling nature. Conversations which resemble counselling can be optimal counselling opportunities. In this paper we describe and develop these counselling conversations, which we call Informal Situated Counselling. †An earlier version of this article has been published in Norsk Pedagogisk Tidsskrift [Journal of Norwegien Pedagogic].

Reading comprehension in French 1st and 2nd grade children: Contribution of decoding and language comprehension

2006

This paper reports a study conducted with French first-grade and second-grade children (mean age: 6;8 and 7;8 respectively). The first aim was to re-examine the Gough and Tunmer’s (1986) Simple View in assessing the specific contribution of decoding ability and language comprehension to reading comprehension. The second one was to analyse the difficulties of children in reading comprehension. Reading and listening comprehension were assessed using both visual and auditory version of the same test. Decoding ability was assessed by means of a nonword reading test. On the basis of reading comprehension scores, skilled and less skilled comprehenders were contrasted, and then two groups of less …

Spurious source generation in mapping from noisy phase-self-calibrated data

2008

Phase self-calibration (or selfcal) is an algorithm often used in the calibration of interferometric observations in astronomy. Although a powerful tool, this algorithm presents strong limitations when applied to data with a low signal-to-noise ratio. We analyze the artifacts that the phase selfcal algorithm produces when applied to extremely noisy data. We show how the phase selfcal may generate a spurious source in the sky from a distribution of completely random visibilities. This spurious source is indistinguishable from a real one. We numerically and analytically compute the relationship between the maximum spurious flux density generated by selfcal from noise and the particulars of th…