Extended time is the most common accommodation requested by post-secondary students with learning disabilities (LD; Lovett, 2010; Ofiesh, 2000; Zuriff, 2000). However, this accommodation has been the topic of much debate (see: Lovett, 2010). Two theories have emerged on this topic, the Maximum Potential Thesis and the Differential Boost Hypothesis (Sireci, Scarpati & Li, 2005; Zuriff, 2000). The current study examines these theories within the context of writing to investigate the performance of students with LD and their non-LD peers. The results do not show support for either theory, when it comes to essay writing across a qualitative dimension (WIAT-II Essay Composition). However, there does appear to be some evidence for the Differential Boost Hypothesis in the areas of word count, which could be considered a quantitative measure of performance. Compared to their performance under regular time conditions, with extended time students with LD wrote more than twice as many additional words compared to their non-LD peers. This research is important so that empirically-informed accommodations for students with LD can be implemented. Recommendations for future research are provided. / Graduate / 2015-11-20 / 0525 / goeganld@gmail.com

The emission of the telemetry signal is required over minimum two different antennas to keep the telemetry link available during a maneuver of a flying object. If nothing is made at the transmitter side, the telemetry link can be fully lost as both signals may have an opposite phase. This is the well-known “2-antennas problem”, also known as the “porcupine effect”. In 2016, Zodiac Data Systems (ZDS) presented a pragmatic and cost effective concept named eXtended Time Diversity (XTD) which is dedicated to combat the porcupine effect. The efficiency of this concept was demonstrated through lab tests, as well as its robustness in presence of multipath. The goal of this paper is to present the performance of the Extended Time Diversity in real conditions, after a series of flight tests.

abstract: Heating of asphalt during production and construction causes the volatilization and oxidation of binders used in mixes. Volatilization and oxidation causes degradation of asphalt pavements by increasing the stiffness of the binders, increasing susceptibility to cracking and negatively affecting the functional and structural performance of the pavements. Degradation of asphalt binders by volatilization and oxidation due to high production temperature occur during early stages of pavement life and are known as Short Term Aging (STA). Elevated temperatures and increased exposure time to elevated temperatures causes increased STA of asphalt. The objective of this research was to investigate how elevated mixing temperatures and exposure time to elevated temperatures affect aging and stiffening of binders, thus influencing properties of the asphalt mixtures. The study was conducted in two stages. The first stage evaluated STA effect of asphalt binders. It involved aging two Performance Graded (PG) virgin asphalt binders, PG 76-16 and PG 64-22 at two different temperatures and durations, then measuring their viscosities. The second stage involved evaluating the effects of elevated STA temperature and time on properties of the asphalt mixtures. It involved STA of asphalt mixtures produced in the laboratory with the PG 64-22 binder at mixing temperatures elevated 25OF above standard practice; STA times at 2 and 4 hours longer than standard practices, and then compacted in a gyratory compactor. Dynamic modulus (E*) and Indirect Tensile Strength (IDT) were measured for the aged mixtures for each temperature and duration to determine the effect of different aging times and temperatures on the stiffness and fatigue properties of the aged asphalt mixtures. The binder test results showed that in all cases, there was increased viscosity. The results showed the highest increase in viscosity resulted from increased aging time. The results also indicated that PG 64-22 was more susceptible to elevated STA temperature and extended time than the PG 76-16 binders. The asphalt mixture test results confirmed the expected outcome that increasing the STA and mixing temperature by 25oF alters the stiffness of mixtures. Significant change in the dynamic modulus mostly occurred at four hour increase in STA time regardless of temperature. / Dissertation/Thesis / M.S. Civil and Environmental Engineering 2013

No description available.

Bakgrund: Långa vårdtider i ambulansen påverkar överlevnaden negativt hos kritiskapatienter. Dagens ambulanssjukvård i glesbygd kräver högre kompetens och ställer ökadekrav på ambulanssjuksköterskor (AS), då de ofta möter utmaningar relaterade till begränsaderesurser och långa vårdtider. Benner (1993) användes som teoretisk utgångspunkt.Syfte: Syftet med studien var att beskriva ambulanssjuksköterskors erfarenheter av att vårdaen kritisk sjuk eller skadad patient under en längre vårdtid i ambulans.Metod: En kvalitativ intervjustudie. Åtta AS från fyra olika ambulansstationer intervjuades.Urvalet gjordes med ett strategiskt- och bekvämlighetsurval. Data analyserades induktivt medkvalitativ innehållsanalys enligt Graneheim och Lundman (2004).Resultat: AS upplevde ett stort ansvar, stress och betydande utmaningar vid vård av kritiskapatienter under långa vårdtider i ambulansen. Hög kompetens och tillgång till mer resurservar avgörande för patientens överlevnad. AS betonade teamarbete, kompetens och riktlinjersom viktiga framgångsfaktorer.Slutsats: Vid vård av kritiska patienter var tillgång till mer resurser, stöd och högrekompetens avgörande för patientens överlevnad, särskilt i områden där ambulanserna hadelångt till sjukhus. AS upplevde att de resurser, stöd och kompetens som idag fanns iambulansen inte var tillräckligt för att AS skulle uppleva sig trygga i att kunna tillhandahålladen kravbild på vård som förväntades av ambulanssjukvården.

Cette thèse présente différentes approches quantiques pour l'exploration de processus dynamiques dans des systèmes multiélectroniques, en particulier après une forte excitation qui peut aboutir à des effets dissipatifs. Les théories de champ moyen sont un outil utile à cet égard. Malgré l'existence de nombreux travaux réalisés ces deux dernières décennies, ces théories peinent à reproduire complètement la corrélation à deux corps. La thermalisation est un des effets des collisions électron-électron. Après un chapitre introductif, on présentera dans le chapitre 2 le formalisme de plusieurs méthodes étudiées dans cette thèse, ayant pour but la description de ces effets en ajoutant un terme de collision au champ moyen. Ces méthodes sont appelées Stochastic Time-Dependent Hartree Fock (STDHF), Extended TDHF (ETDHF) et Collisional TDHF (CTDHF). Cette dernière méthode représente d'une certaine façon le résultat principal de cette thèse. L'implémentation numérique de chacune de ces méthodes sera aussi examinée en détail. Dans les chapitres 3, 4 et 5, nous appliquerons à différents systèmes les méthodes présentées dans le chapitre 2. Dans le chapitre 3, nous étudions d'abord un canal de réaction rare, ici la probabilité d'un électron de s'attacher à un petit agrégat d'eau. Un bon accord avec les données expérimentales a été observé. Dans le chapitre 4, un modèle fréquemment utilisé en physique nucléaire est résolu exactement et comparé quantitativement à STDHF. L'évolution temporelle des observables à un corps s'accorde entre les deux méthodes, plus particulièrement en ce qui concerne le comportement thermique. Néanmoins, pour permettre une bonne description de la dynamique, il est nécessaire d'avoir une grande statistique, ce qui peut être un frein à l'utilisation de STDHF sur de larges systèmes. Pour surpasser cette difficulté, dans le chapitre 5 nous testons CTDHF, qui a été introduit dans le chapitre 2, sur un modèle à une dimension (et sans émission électronique). Le modèle se compose d'électrons dans un potentiel de type jellium avec une interaction auto-cohérente sous la forme d'une fonctionnelle de la densité. L'avantage de ce modèle à une dimension est que les calculs STDHF sont possibles numériquement, ce qui permet une comparaison directe aux calculs CTDHF. Dans cette étude de validité du concept, CTDHF s'accorde remarquablement bien avec STDHF. Cela pose les jalons pour une description efficace de la dissipation dans des systèmes réalistes en trois dimensions par CTDHF. / This thesis presents various quantal approaches for the exploration of dynamical processes in multielectronic systems, especially after an intense excitation which can possibly lead to dissipative effects. Mean field theories constitute useful tools in that respect. Despite the existence of numerous works during the past two decades, they have strong difficulties to capture full 2-body correlations. Thermalization is one of these effects that stems from electron-electron collisions. After an introductory chapter, we present in Chapter 2 the formalism of the various schemes studied in this thesis toward the description of such an effect by including collisional terms on top of a mean field theory. These schemes are called Stochastic Time-Dependent Hartree Fock (STDHF), Extended TDHF (ETDHF) and Collisional TDHF (CTDHF). The latter scheme constitutes in some sense the main achievement of this thesis. The numerical realizations of each scheme are also discussed in detail. In Chapters 3, 4 and 5, we apply the approaches discussed in Chapter 2 but in various systems. In Chapter 3, we first explore a rare reaction channel, that is the probability of an electron to attach on small water clusters. Good agreement with experimental data is achieved. In Chapter 4, a model widely used in nuclear physics is exactly solved and quantitatively compared to STDHF. The time evolution of 1-body observables agrees well in both schemes, especially what concerns thermal behavior. However, to allow a good description of the dynamics, one is bound to use a large statistics, which can constitute a hindrance of the use of STDHF in larger systems. To overcome this problem, in Chapter 5, we go for a testing of CTDHF developed in Chapter 2 in a one-dimensional system (and without electronic emission). This system consists in electrons in a jellium potential with a simplified self-consistent interaction expressed as a functional of the density. The advantage of this 1D model is that STDHF calculations are numerically manageable and therefore allows a direct comparison with CTDHF calculations. In this proof of concept study, CTDHF compares remarkably well with STDHF. This thus paves the road toward an efficient description of dissipation in realistic 3D systems by CTDHF.