Search results for "PAC"

Laser fluence, repetition rate and pulse duration effects on paint ablation

2006

Abstract The efficiency (mm3/(J pulse)) of laser ablation of paint was investigated with nanosecond pulsed Nd:YAG lasers (λ = 532 nm) as a function of the following laser beam parameters: pulse repetition rate (1–10,000 Hz), laser fluence (0.1–5 J/cm2) and pulse duration (5 ns and 100 ns). In our study, the best ablation efficiency (η ≅ 0.3 mm3/J) was obtained with the highest repetition rate (10 kHz) at the fluence F = 1.5 J/cm2. This ablation efficiency can be associated with heat accumulation at high repetition rate, which leads to the ablation threshold decrease. Despite the low thermal diffusivity and the low optical absorption of the paint (thermal confinement regime), the ablation th…

The (im)possible success of disadvantaged students. Reflections on education, migration and social change

2019

The paper focuses on the ?unexpected pathways? of successful students with an immigrant background: these biographical routes, that seems socially impossible, raise theoretical issues around the individual-society, actor-structure relationship. Disadvantaged students who succeed represent a sociological challenge in the attempt to understand atypical situations and to identify the institutional processes and the structural opportunities that facilitate them, reducing ethnic inequalities in education. This framework is the starting point of the Su.Per. project (Success in educational pathways of students with immigrant background), based on the collection of written autobiographies of 65 imm…

Can adjunctive corticosteroid therapy improve patient-centered outcomes following third molar surgery? A systematic review

2021

Third molar surgery is frequently associated with postoperative discomfort such as pain, edema and trismus. We aimed to evaluate the current evidence on the efficacy of adjunctive corticosteroid therapy in improving patient-centered outcomes following third molar surgery.This systematic review assessed and searched PubMed, Google scholar, Scopus, web of science, clinicaltrials.gov and Cochrane central for controlled trials, up to May 2021. The primary outcome measures were patient-centered outcomes such as quality of life following the use of adjunctive corticosteroid therapy in third molar removal. Only randomized controlled trials published in English language were included.A total of 355…

Violência, evasão e exclusão na educação superior

2019

The present text focuses on a relationship between higher education, institutional and symbolic violence and exclusion, practicing as a challenge based on reflections on the existence of evasion in Brazilian university. Ignoring the educational institution as a direct responsible for these things, this text considers that a logic in University organization and operation helps to enlarge inequalities that provide the mechanisms of evasion; at the same time, it presents itself as a space of reference and a struggle against social inequalities and violence. On a provisional basis, the text stands out that: depending on the execution of educational procedures and practices undertaken by the ins…

QCD NLO with Powheg matching and top threshold matching in WHIZARD

2016

We present the status of the automation of NLO processes within the event generator WHIZARD. The program provides an automated FKS subtraction and phase space integration over the FKS regions, while the (QCD) NLO matrix element is accessed via the Binoth Les Houches Interface from an externally linked one-loop program. Massless and massive test cases and validation are shown for several e+e- processes. Furthermore, we discuss work in progress and future plans. The second part covers the matching of the NRQCD prediction with NLL threshold resummation to the NLO continuum top pair production at lepton colliders. Both the S-wave and P-wave production of the top pair are taken into account in t…

Proportions. Science, Musique, Peinture et Architecture

2012

Le langage des proportions est un langage de comparaison. Outil scientifique, il met en relation grandeurs mathématiques ou physiques (deux cercles, deux mouvements, deux sons, etc.). Pour autant, son application ne se restreint pas au seul champ des mathématiques. Erigé en principe philosophique par le principe de comparaison qui le sous-tend, il déploie tout son potentiel analogique en devenant langage constructeur d'harmonie. La théorie des proportions s'ouvre ainsi sur un vaste champ de relations qui définissent canons et règles de beauté dans les diverses disciplines artistiques. S'intéresser aux proportions signifie donc s'intéresser à tous les domaines du savoir. Mais comment aborder…

Análisis de la autopercepción en base al modelo tpack en los futuros y las futuras docentes de educación primaria

2020

El avance de las tecnologías digitales está haciendo que los procesos de enseñanza-aprendizaje se vean modificados ante la necesidad de incorporar las TIC en la labor docente. En esta circunstancia, la formación inicial se torna indispensable de cara a una implementación que tenga en cuenta todos los aspectos que interfieren en el proceso educativo. Para ello, modelos que tengan en cuenta las diferentes dimensiones conceptuales, pedagógicas y tecnológicas pueden ayudar en una óptima inserción de la tecnología digital en la escuela. Por ello, esta investigación de carácter descriptivo analiza las autopercepciones en base al modelo TPACK (Technological Pedagogical Content Knowledge) de un tot…

Tiempo y espacio. Un comentario sobre la tesis doctoral de Weiqiao Wang

2023

Essays concerning Hume's natural philosophy

2016

The subject of this essay-based dissertation is Hume’s natural philosophy. The dissertation consists of four separate essays and an introduction. These essays do not only treat Hume’s views on the topic of natural philosophy, but his views are placed into a broader context of history of philosophy and science, physics in particular. The introductory section outlines the historical context, shows how the individual essays are connected, expounds what kind of research methodology has been used, and encapsulates the research contributions of the essays. The first essay treats Newton’s experimentalist methodology in gravity research and its relation to Hume’s causal philosophy. It is argued tha…

Organisational GDPR Investments and Impacts

2023

The aim of this empirical multi-case study is to understand the GDPR investments and impacts of the organisations. Among these, the measuring experiences related to GDPR and information security (Isec), and the future expectations are examined. Several interesting findings were recognised, which also enabled further suggestions. First, an understanding of the organisations’ investments and their impact is built by gathering information about the actions that organisations made to fulfil the GDPR requirements. In the second phase, it is deemed necessary to examine how organisations experience the measures and evaluation of GDPR development and progress, in order to understand how respondents…