In dieser Arbeit wird eine kombinierte Messung der elektro-schwachen Produktion einzelner Top-Quarks im s- und t-Kanal vorgestellt. Der analysierte Datensatz von Proton-Proton-Kollisionsereignissen wurde im Jahr 2012 mit dem ATLAS Detektor am Large Hadron Collider bei einer Schwerpunktsenergie von 8 TeV aufgezeichnet und entspricht einer integrierten Luminosität von 20.3 fb^{-1}. Die Ereignisauswahl beschränkt sich auf Ereignisse mit einem isolierten Elektron oder Myon und zwei Jets. Mit Hilfe der Matrix Element Methode werden Prozess-Likelihoods berechnet. Aus diesen wird eine Diskriminante gebildet um Signal- und Untergrundereignisse voneinander zu trennen. Die Wirkungsquerschnitte für die Produktion einzelner Top-Quarks wurden mittels eines kombinierten Maximum Likelihoods Fits zu sigma_{s} = 4,9 +- 1,7 pb und sigma_{t} = 82,32^{+7,0}_{-5,5} pb bestimmt. Die Korrelation zwischen beiden Messungen beträgt 8%. Diese beiden Ergebnisse werden zusammen mit einer unabhängigen Messung der assoziierten Wt Produktion verwendet um zwei Parameter, cquer_{phiq} und cquer_{qq}, im Rahmen einer effektiven Feldtheorie zu bestimmen. Notwendige Akzeptanzkorrekturen wurden mit Hilfe schneller und vereinfachter Detektorsimulationen ermittelt. Diese Korrekturen werden in dem statistischen Modell zur Bestimmung der effektiven Feldtheorie-Parametern berücksichtigt. Die kleinsten Intervalle, welche 95,5% des gesamten Wahrscheinlichkeitsbereichs entsprechen, sind -0,132 < cquer_{phiq} < 0,048 und -0,0283 < cquer_{qq} < 0,0062 für die beiden Kopplungsparameter. / This thesis presents a combined measurement of single top-quark production in the s and t-channel with the ATLAS detector at the Large Hadron Collider. The 2012 data set of proton--proton collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3 fb^{-1} is used. The event selection for both channels requires one isolated electron or muon and two jets in the final state. In order to separate signal from background events, a discriminant variable is built from likelihoods obtained with the matrix element method. The cross section for both channels are determined by a combined maximum likelihood fit, which yields sigma_{s} = 4.9 +- 1.7 pb and sigma_{t} = 82.32^{+7.0}_{-5.5} pb for the s-channel and t-channel, respectively. The correlation of the two cross section measurements is 8%. These results together with an independent measurement of the associated Wt production are used to set limits on two parameters, cbar_{phiq} and cbar_{qq}, within the framework of an effective field theory. Acceptance corrections are derived as a function of the model parameters by using fast and simplified detector simulations. These corrections are included in the statistical model and the smallest intervals that correspond to 95.5% probability are -0.132 < cbar_{phiq} < 0.048 and -0.0283 < cbar_{qq} < 0.0062 for the two parameters.

Afrikaans text / Die doel van die studie is om buffer- en risikofaktore te verken wat ‟n rol in die ontwikkeling van gehoorgestremde kleuters kan speel. Gehoorgestremde kleuters presenteer met ‟n gehoorverlies, wat hul van normaalhorende kleuters onderskei. Tog beskik alle kleuters oor primêre behoeftes. Lewenskwaliteit word verbeter deur behoeftevervulling, wat die ontwikkelingsproses beïnvloed. Hierdie behoeftes word vervul deur die kleuter, asook faktore vanuit die omgewing. ‟n Literatuurstudie is onderneem as teoretiese raamwerk, wat teorieë omtrent die omgewing en behoeftes, buffer- en risikofaktore en kleuterontwikkeling insluit. Data is vanuit ‟n kwalitatiewe benadering ingesamel deur semi-gestruktureerde onderhoude en ekokaarte saamgestel deur ouers van gehoorgestremde kleuters. Kontrolering en integrering van data het deur triangulering geskied. Buffer- en risikofaktore binne kleuters self, die gesin en die breër gemeenskap is verken. Die studie is verkennend en beskrywend, en toegepaste navorsing is gebruik. So is gevolgtrekkinge en aanbevelings gemaak om toepaslike ondersteuning aan ouers van gehoorgestremde kleuters te bewerkstellig. / The aim of the study is to explore the protective and risk factors that may contribute to the development of hearing-impaired toddlers. Hearing impaired toddlers present with a hearing loss, which distinguish them from toddlers with normal hearing. However, all toddlers have primary needs. Quality of life is improved by the fulfilment of needs, which influences the developmental process. These needs are fulfilled by the toddler, as well as by factors from the environment. A literature study was conducted as theoretical framework. This included theories regarding the environment and needs, protective and risk factors, and toddler development. In this qualitative study, data collection was conducted by semi-structured interviews and the compilation of ecomaps by parents of hearing impaired toddlers. Triangulation was used to verify and integrate data. Protective and risk factors were explored within the toddler, the family and the wider community. This study is exploratory and descriptive and applied research was used. In this way conclusions and recommendations were made to provide appropriate support to parents of hearing impaired toddlers. / Social Work / M. Diac. (Spelterapie)

Afrikaans text / Die doel van die studie is om buffer- en risikofaktore te verken wat ‟n rol in die ontwikkeling van gehoorgestremde kleuters kan speel. Gehoorgestremde kleuters presenteer met ‟n gehoorverlies, wat hul van normaalhorende kleuters onderskei. Tog beskik alle kleuters oor primêre behoeftes. Lewenskwaliteit word verbeter deur behoeftevervulling, wat die ontwikkelingsproses beïnvloed. Hierdie behoeftes word vervul deur die kleuter, asook faktore vanuit die omgewing. ‟n Literatuurstudie is onderneem as teoretiese raamwerk, wat teorieë omtrent die omgewing en behoeftes, buffer- en risikofaktore en kleuterontwikkeling insluit. Data is vanuit ‟n kwalitatiewe benadering ingesamel deur semi-gestruktureerde onderhoude en ekokaarte saamgestel deur ouers van gehoorgestremde kleuters. Kontrolering en integrering van data het deur triangulering geskied. Buffer- en risikofaktore binne kleuters self, die gesin en die breër gemeenskap is verken. Die studie is verkennend en beskrywend, en toegepaste navorsing is gebruik. So is gevolgtrekkinge en aanbevelings gemaak om toepaslike ondersteuning aan ouers van gehoorgestremde kleuters te bewerkstellig. / The aim of the study is to explore the protective and risk factors that may contribute to the development of hearing-impaired toddlers. Hearing impaired toddlers present with a hearing loss, which distinguish them from toddlers with normal hearing. However, all toddlers have primary needs. Quality of life is improved by the fulfilment of needs, which influences the developmental process. These needs are fulfilled by the toddler, as well as by factors from the environment. A literature study was conducted as theoretical framework. This included theories regarding the environment and needs, protective and risk factors, and toddler development. In this qualitative study, data collection was conducted by semi-structured interviews and the compilation of ecomaps by parents of hearing impaired toddlers. Triangulation was used to verify and integrate data. Protective and risk factors were explored within the toddler, the family and the wider community. This study is exploratory and descriptive and applied research was used. In this way conclusions and recommendations were made to provide appropriate support to parents of hearing impaired toddlers. / Social Work / M. Diac. (Spelterapie)