Search results for "Fluence"
showing 10 items of 482 documents
Particle detectors made of high-resistivity Czochralski silicon
2005
We have processed pin-diodes and strip detectors on n- and p-type high-resistivity silicon wafers grown by magnetic Czochralski method. The Czochralski silicon (Cz-Si) wafers manufactured by Okmetic Oyj have nominal resistivity of 900 O cm and 1.9 kO cm for n- and p-type, respectively. The oxygen concentration in these substrates is slightly less than typically in wafers used for integrated circuit fabrication. This is optimal for semiconductor fabrication as well as for radiation hardness. The radiation hardness of devices has been investigated with several irradiation campaigns including low- and high-energy protons, neutrons, g-rays, lithium ions and electrons. Cz-Si was found to be more…
X-ray spectroscopy and dosimetry with a portable CdTe device.
2007
Abstract X-ray spectra and dosimetry information are very important for quality assurance (QA) and quality control (QC) in medical diagnostic X-ray systems. An accurate knowledge of the diagnostic X-ray spectra would improve the patient dose optimization, without compromising image information. In this work, we performed direct diagnostic X-ray spectra measurements with a portable device, based on a CdTe solid-state detector. The portable device is able to directly measure X-ray spectra at high photon fluence rates, as typical of clinical radiography. We investigated on the spectral performances of the system in the mammographic energy range (up to ∼40 keV). Good system response to monoener…
Measurements of Thermal and Resonance Neutron Fluence and Induced Radioactivity Inside Bunkers of Medical Linear Accelerators in the Center of Oncolo…
2016
Emission of high-energy X-ray and electron therapeutic beams from medical linear accelerators is related to undesirable neutron production and to induction of radioactivity. In this work, measurements of thermal and resonance neutron fluence and induced radioactivity were performed inside two bunkers with medical linacs — Elekta in the Center of Oncology in Opole (Poland). The bunkers differ with a construction of their walls. The neutron measurements were performed by means of the induced activity method during emission of the 18 MV X-ray beam. The investigation of radioactivity induced by neutrons was based on the method of off-line gammaray spectroscopy measurements. This work has shown …
Ekspansja tradycyjnej muzyki podhalańskiej na północ
2020
Artykuł jest próbą przybliżenia zmian zachodzących w tradycyjnej muzyce Podhala w ciągu ostatnich stu pięćdziesięciu lat oraz jej wpływu na repertuar tradycyjny terenów położonych na północ od tego regionu. Wnioski zostały sformułowane na podstawie źródeł archiwalnych – pisanych i fonograficznych – oraz badań własnych przeprowadzonych w ciągu ostatniej dekady na terenie powiatów myślenickiego, suskiego i nowotarskiego (północna część). Wydaje się, że w XIX wieku istniała daleko idąca wspólnota repertuarowa Podhala i Beskidu, trudno więc prześledzić, czy podobne wątki tekstowe i melodyczne są dowodem na jedność repertuaru, czy może na ścisłą ekspansję muzyki z Podhala w kierunku północnym. W…
Alternative Civil Enculturation
2010
The article investigates the ways in which minority schools in Latvia, Estonia, and Slovakia resist the dominant narratives of nation and citizenship and provide an alternative model of civil enculturation for students. It provides evidence to support the hypothesis that differences between competing narratives of statehood and nationhood among schools of two major ethnic groups in each country constitute relatively separate models of civil enculturation that may be shaped by political and social factors outside the school, such as power relations among groups.
Making sides and taking sides: an analysis of salient images and category constructions for pro- and anti-Gulf War respondents
1998
This paper reports supportive evidence for a modified self-categorisation model of mass social influence, whereby category definitions are determined rhetorically and the character of collective action is shaped through category arguments. The study was conducted shortly after the Gulf War and was concerned with the respective constructions of pro- and anti-war respondents. Respondents were first asked to recall the images of the war which had most impact on them. They were then shown 29 images of the war and asked to rate the impact of each one as well as explain why they had given such impact ratings. Finally, they were asked to select the five images which had most impact on them. The re…
A new approach for modeling dry deposition velocity of particles
2018
Abstract The dry deposition process is recognized as an important pathway among the various removal processes of pollutants in the atmosphere. In this field, there are several models reported in the literature useful to predict the dry deposition velocity of particles of different diameters but many of them are not capable of representing dry deposition phenomena for several categories of pollutants and deposition surfaces. Moreover, their applications is valid for specific conditions and if the data in that application meet all of the assumptions required of the data used to define the model. In this paper a new dry deposition velocity model based on an electrical analogy schema is propose…
School bullying as a creator of pupil peer pressure
2008
Background: Research into school bullying has a long tradition but a rather narrow scope. Many prevention programmes have been designed, but despite extensive investigation, most studies suggest that bullying is not decreasing. There is something paradoxical in this phenomenon. In order to have any real impact on some phenomena, thorough understanding is needed. What, then, is the essence of school bullying? How does it develop and how is it maintained in a community? In the present study written material and interviews concerning pupils´ experiences of bullying were used to examine how the status of the bully is created among pupils and how cultural norms and values in the community are co…
Compétences langagières acquises en milieu familial et acquisitions scolaires en cycle 2 : Le cas du créole et du français en contexte martiniquais
2006
06072 - 89 p.; Projet retenu dans l'appel à projet en 2003. ACI Ecole et Sciences cognitives (Ministère délégué à la recherche et aux nouvelles technologies); Ce projet vise en particulier à répondre à trois questions : Le niveau de langage en français des enfants créolophones est-il quantitativement et qualitativement différent des enfants de métropole ? Existe t-il une corrélation entre les compétences langagières dans l'une et l'autre langue ? Leur niveau en deux langues exerce t-il un impact sur leurs acquisitions scolaires? Avant de présenter la méthodologie de l'étude, une revue de questions et d'études en matière de bilinguisme est proposée selon deux champs disciplinaires : psycholi…
Separation of Cognitive Impairments in Attention-Deficit/Hyperactivity Disorder Into 2 Familial Factors
2010
Contains fulltext : 89304.pdf (Publisher’s version ) (Open Access) CONTEXT: Attention-deficit/hyperactivity disorder (ADHD) is associated with widespread cognitive impairments, but it is not known whether the apparent multiple impairments share etiological roots or separate etiological pathways exist. A better understanding of the etiological pathways is important for the development of targeted interventions and for identification of suitable intermediate phenotypes for molecular genetic investigations. OBJECTIVES: To determine, by using a multivariate familial factor analysis approach, whether 1 or more familial factors underlie the slow and variable reaction times, impaired response inhi…