Skolan befinner sig i en förändringsprocess där lärares auktoritet inte längre är självklar, istället söker lärare efter nya sätt att hålla ordning och skapa arbetsro. Hanteringen av konflikter har visat sig viktig i en tid då konflikter tillåts komma upp för diskussion och upplevs som en allt större del av lärares vardag. Syftet med denna undersökning är att se på hur lärare hanterar konflikter mellan elever på lågstadiet och mellanstadiet. Dessutom är syftet att undersöka vilka faktorer hos lärarna som påverkar hur de hanterar konflikter. Frågeställningen handlar om hur lärare hanterar konflikter och hur de förstår vad som ligger bakom konflikterna. Vidare undersöks ifall djupare förståelse för bakgrunden till konflikterna leder till mer omfattande konflikthantering. Slutligen undersöks andra faktorer som påverkar hur lärarna hanterar konflikter. Metoden utgörs av kvalitativa intervjuer med sju klasslärare på låg- och mellanstadiet. Lärarna uppmanas att berätta om elevkonflikter som upplevts som svåra. Dessutom ställs frågor om det pyskosociala klimatet i lärarens klass, denna information används för att analysera lärares attityder inom olika områden. Analysen, som har både kvalitativa och kvantitativa inslag, ger en översikt som beskriver relationen mellan konflikthanteringen och konflikterna i jämförelse med en idealmodell. Utifrån lärarnas uttalande undersöks lärarnas kunskap och förmågor, vilket därefter jämförs med konflikthanteringen. Resultaten indikerar att flera faktorer gällande lärares kunskap, förmågor och attityder har inverkan på hur de hanterar konflikter.

When subjected to a combination of moment and shear force, a reinforced concrete (RC) beam with either little or no transverse reinforcement can fail in shear before reaching its full flexural strength. This type of failure is sudden in nature and usually disastrous because it does not give sufficient warning prior to collapse. To prevent this type of shear failure, reinforced concrete beams are traditionally reinforced with stirrups. However, the use of stirrups is not always cost effective since it increases labor costs, and can make casting concrete difficult in situations where closely-spaced stirrups are required. The use of steel fiber reinforced concrete (SFRC) could be considered as a potential alternative to the use of traditional shear reinforcement. Concrete is very weak and brittle in tension, SFRC transforms this behaviour and improves the diagonal tension capacity of concrete and thus can result in significant enhancements in shear capacity. However, one of the drawbacks associated with SFRC is that the addition of fibers to a regular concrete mix can cause problems in workability. The use of self-consolidating concrete (SCC) is an innovative solution to this problem and can result in improved workability when fibers are added to the mix. The thesis presents the experimental results from tests on twelve slender self-consolidating fiber reinforced concrete (SCFRC) beams tested under four-point loading. The results demonstrate the combined use of SCC and steel fibers can improve the shear resistance of reinforced concrete beams, enhance crack control and can promote flexural ductility. Despite extensive research, there is a lack of accurate and reliable design guidelines for the use of SFRC in beams. This study presents a rational model which can accurately predict the shear resistance of steel fiber reinforced concrete beams. The thesis also proposes a safe and reliable equation which can be used for the shear design of SFRC beams.

Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal

Active matter refers to systems driven out of thermal equilibrium by the uptake and dissipation of energy directly at the level of the individual constituents, which then undergo systematic movement in a direction decided by their own internal state. This category of nonequilibrium systems was defined as the physical model of motile, metabolizing matter, but the definition has a wider application. In this thesis we work with monolayer of macro-scopic granular particles lying on a vibrated surface and show that it provides a faithful realisation of active matter. The vibration feeds energy into the tilting vertical motion of the particles, which transduces it into a horizontal movement via frictional contact with the base in a direction determined by its orientation in the plane. We show that the dynamics of the particles can be easily controlled by manipulating their geometrical shapes. In the second part of the thesis, not addressing active matter, we do experiments on a soft condensed mat-ter system of viscoelastic surfactant gel formed of an entangled network of wormlike micelles and shows shear-thinning and is therefore non-Newtonian. These systems have relaxation times of the order of seconds and we have studied their non-equilibrium response properties when driven out of equilibrium externally by the gravitational sedimentation of objects and rising air-bubbles. Chapter 1 gives a general introduction to the term active matter and emphasize particularly on how these systems are internally driven and work far away from the equilibrium. We then explain in detail how a system of granular particles lying on a vibrating surface acts as active matter. We later give a brief introduction to the field of soft condensed matter and discuss the viscoelastic properties of surfactant solutions and their phase behaviour. We end this chapter by giving a brief introduction to flocking and non-equilibrium fluctuation relations which act as prerequisite to the following chapters. In Chapter 2 we discuss the experimental techniques used by us. We will first describe the shapes and dimensions of the granular particles used in the experiments. Next we introduce the shaker set-up and describe the experimental cell in which the particles are confined and variation in cell’s boundary. We show the dynamics of the particles in a quasi one-dimensional channel and then in two-dimensions. We give a brief account of image analysis and tracking algorithms employed and other data analyses techniques. In Chapter 3, we study the non-equilibrium fluctuations of a self-propelled polar particle moving through a background of non-motile spherical beads in the context of the Gallavotti-Cohen Fluctuation Relation (GCFR), which generalizes the second law of thermodynamics by quantifying the relative probabilities of the instantaneous events of entropy consumption and production. We find a fluctuation relation for a non-thermodynamic quantity, the velocity component along the long axis of the particle. We calculate the Large Deviation Function (LDF) of the velocity fluctuations and find the first experimental evidence for its theoretically predicted slope singularity at zero. We also propose an independent way to estimate the mean phase-space contraction rate. In Chapter 4 we expand the analysis done in Chapter 3 and study the two-dimensional velocity vector of the particle in the context of Isometric Fluctuation Relation (IFR) which measures the relative probability of current fluctuations in different directions in space of dimension >1. We first show that the dynamics of the particle is not isotropic and present a minimal model for its dynamics as a biased random walker, driven by a noise with anisotropic strength and construct an Anisotropic IFR (AIFR). We then show that the velocity statistics of the polar particle agree with the AIFR. We also confirm that the GCFR can be obtained as a special case of AIFR when the velocity vectors point in opposite directions. We calculate the LDF of particle’s velocity vector and find an extended kink in the velocity plane. In Chapter 5 we study the flocking phenomenon of a collection of polar particles when moving through a background of non-motile beads. We show that in the presence of bead medium, polar particles can flock at much lower concentrations, in contrast to the Vicsek model which predicts flocking at high concentrations. We show that the moving rods lead to a bead flow which in turn helps them to communicate their orientations and velocities at much greater distances. We provide a phase diagram in the parameter space of concentrations of beads and polar particles and show power-law spatial correlations as we approach the phase boundary. We also discuss the numerical simulations and theoretical model presented which support the experiments results. In Chapter 6 we experimentally study the angle dependence of the trapping of collection of active granular rods in a chevron shaped geometry. We show the particles undergo a trapping-detrapping transition at θ = 1150. On the contrary, this angle value is θ = 700 for a single rod. We find a substantial decrease in rotational noise for a collection of particles inside a trap as compared to a single rod which explains the increased value of θ for the trapping-detrapping transition. We also show that polar active particles which tend to change their direction of motion do not show the trapping phenomenon. In Chapter 7 we conduct experiments on falling balls and rising air bubbles through a non-Newtonian solution of surfactant CTAT in water, which forms a viscoelastic wormlike micellar gel. We show that the motion of the ball undergoes a transition from a steady state to oscillatory as the diameter of the ball is increased. The oscillations in velocity of the ball are non-sinusoidal, consisting of high-frequency bursts occurring periodically at intervals long compared to the period within the bursts. We present a theoretical model based on a slow relaxation mechanism owing to structural instabilities in the constituent micelles of the viscoelastic gel. For the case of air bubbles, we show that an air bubble rising in the viscoelastic gel shows a discontinuous jump in the velocity beyond a critical volume followed by a drastic change in its shape from a teardrop to almost spherical. We also observe shape oscillations for bigger bubbles with the tail swapping in and out periodically.

Toute l’œuvre d’Albert Cohen se centre autour de la mise en scène de fictions identitaires de la judéité. Le romancier avait pour projet d’écrire une vaste « geste des Juifs » à travers les aventures de Solal. Mais ce dessein, affiché délibérément pour les romans, semble en réalité dépasser leur cadre et proposer une immense fresque, autobiographique, romanesque, poétique comme théâtrale, où les aventures de la judéité s’exhibent comme l’actant principal et le ferment majeur d’une esthétique originale. La judéité se vit à la fois en tant qu’expérience singulière et en tant qu’aventure collective. Elle est ainsi un puissant moteur romanesque fondant une mythologie qui lui reste propre. Construite à l’aune d’une filiation homérique, la geste de la judéité propose, plus qu’une épopée à la manière des gestes traditionnelles, une traversée de l’existence juive au sein du monde occidental. Cette judéité, d’autant plus problématique qu’elle est sans cesse déniée et réaffirmée par une réquisition absolue de tout l’être juif, qu’elle se dit dans un rapport ambigu devant des origines inappropriables car lacunaires, représente une véritable dynamique de l’écriture tout autant que l’expression incertaine et contradictoire d’une pensée éthique et existentielle. Et la raison principale de ce mouvement puise dans la volonté de faire advenir un devenir-humain, par le biais de la Loi juive, qui modifiera le monde. Aussi, le Messie, figure obsédante et fascinante, hante l’imaginaire de Cohen, s’infiltrant partout, travaillant en sourdine le personnage de Solal et imposant sa facture singulière à l’être juif dans l’œuvre du romancier. Le messianisme chez Cohen est toujours pluriel et polymorphe. Il informe essentiellement des fictions de la judéité : la littérature se chargera de les décliner. / Albert Cohen’s oeuvre revolves around the staging of Jewish identity. Though the novels only were meant as illustrations of Cohen’s desire to write a vast “epic of the Jews” through Solal’s adventures, it would seem that all his works, be they autobiographical, poetic or dramatic, are in actual fact informed by this desire. So central is Jewish identity, experienced both individually and collectively, to Cohen’s thought and creative process that it appears to be the core of his idiosyncratic aesthetics, and that his writing is based on the myths it creates. However indebted they might be to Homer’s works, the novels are nevertheless less a proper epic than the story of Jewish life in the Western world and offer a complex image of Jewish identity. The latter is constantly both denied and reaffirmed and its origins are forever presented as uncertain. This complexity and uncertainty permeates not only Cohen’s writing, but his ethical and existential thought. What is expressed is the desire for the advent of humanity through the Jewish Law, which will change the world. The fascinating, all pervasive figure of the Messiah is thus obsessively present in Cohen’s creative imagination and defines Solal as well as all the Jewish characters in the novels. Cohen’s complex and protean Messianism informs the staging of Jewish identity that will then take various literary forms.

When subjected to a combination of moment and shear force, a reinforced concrete (RC) beam with either little or no transverse reinforcement can fail in shear before reaching its full flexural strength. This type of failure is sudden in nature and usually disastrous because it does not give sufficient warning prior to collapse. To prevent this type of shear failure, reinforced concrete beams are traditionally reinforced with stirrups. However, the use of stirrups is not always cost effective since it increases labor costs, and can make casting concrete difficult in situations where closely-spaced stirrups are required. The use of steel fiber reinforced concrete (SFRC) could be considered as a potential alternative to the use of traditional shear reinforcement. Concrete is very weak and brittle in tension, SFRC transforms this behaviour and improves the diagonal tension capacity of concrete and thus can result in significant enhancements in shear capacity. However, one of the drawbacks associated with SFRC is that the addition of fibers to a regular concrete mix can cause problems in workability. The use of self-consolidating concrete (SCC) is an innovative solution to this problem and can result in improved workability when fibers are added to the mix. The thesis presents the experimental results from tests on twelve slender self-consolidating fiber reinforced concrete (SCFRC) beams tested under four-point loading. The results demonstrate the combined use of SCC and steel fibers can improve the shear resistance of reinforced concrete beams, enhance crack control and can promote flexural ductility. Despite extensive research, there is a lack of accurate and reliable design guidelines for the use of SFRC in beams. This study presents a rational model which can accurately predict the shear resistance of steel fiber reinforced concrete beams. The thesis also proposes a safe and reliable equation which can be used for the shear design of SFRC beams.

No description available.

This research investigates the Neo-Baroque aesthetic of excess in contemporary South African art, and explores reasons for the emergence of this style. It investigates artists who use their bodies as a site of resistance, to contest or reconstruct the dominant social values which establish differences between bodies to place them within the marginal position of ‘Other’. This investigation relates to post-colonial concerns. The artists’ exploitation of the Neo-Baroque aesthetic of excess as a comment on social concerns reveals a sense of crisis within South African society, similar to the conditions from which the seventeenth century Baroque style evolved. Neo-Baroque aesthetics of excess manifest in a variety of ways, and are particularly evident when artists transgress social boundaries placed on the body through abject and erotic associations. Excess ultimately arises from complexity, as hybrid art forms are created from the combination of media and content found within the art work. / Dissertation (MA)--University of Pretoria, 2012. / Visual Arts / unrestricted

No description available.

We compute the Hilbert-Kunz functions of two-dimensional rings of type ADE by using representations of their indecomposable, maximal Cohen-Macaulay modules in terms of matrix factorizations, and as first syzygy modules of homogeneous ideals.