Thesis--Juristische Fakultät, Georg-August-Universität zu Göttingen, Wintersemester 2001/02--Vid. p. 5. / Includes bibliographical references.

Proefschrift Rijksuniversiteit Limburg, Maastricht. / Met lit. opg., reg. en een samenvatting in het Engels.

Proefschrift Erasmus Universiteit Rotterdam. / Omslagtitel. Bibliogr.: p. 357-368. - Met een samenvatting in het Nederlands.

abstract: Recent trends in the electric power industry have led to more attention to optimal operation of power transformers. In a deregulated environment, optimal operation means minimizing the maintenance and extending the life of this critical and costly equipment for the purpose of maximizing profits. Optimal utilization of a transformer can be achieved through the use of dynamic loading. A benefit of dynamic loading is that it allows better utilization of the transformer capacity, thus increasing the flexibility and reliability of the power system. This document presents the progress on a software application which can estimate the maximum time-varying loading capability of transformers. This information can be used to load devices closer to their limits without exceeding the manufacturer specified operating limits. The maximally efficient dynamic loading of transformers requires a model that can accurately predict both top-oil temperatures (TOTs) and hottest-spot temperatures (HSTs). In the previous work, two kinds of thermal TOT and HST models have been studied and used in the application: the IEEE TOT/HST models and the ASU TOT/HST models. And, several metrics have been applied to evaluate the model acceptability and determine the most appropriate models for using in the dynamic loading calculations. In this work, an investigation to improve the existing transformer thermal models performance is presented. Some factors that may affect the model performance such as improper fan status and the error caused by the poor performance of IEEE models are discussed. Additional methods to determine the reliability of transformer thermal models using metrics such as time constant and the model parameters are also provided. A new production grade application for real-time dynamic loading operating purpose is introduced. This application is developed by using an existing planning application, TTeMP, as a start point, which is designed for the dispatchers and load specialists. To overcome the limitations of TTeMP, the new application can perform dynamic loading under emergency conditions, such as loss-of transformer loading. It also has the capability to determine the emergency rating of the transformers for a real-time estimation. / Dissertation/Thesis / M.S. Electrical Engineering 2013

In today’s sport careers there is no room for error. This is why athletes should be “on top of their game” every time they compete. It is very important for athletes to keep their emotions under control, because emotions can sometimes determine success or failure. But more important is how the athlete reacts to success and failure. Therefore, in this study the aim was to establish an athlete’s reaction to success and failure. An athlete should have the ability or strategy to handle success and failure. According to this statement, it underlines the importance of the current study. The fact that there are limited resources in this field accentuates the need for this study. Each athlete experiences and reacts to success or failure differently. An athlete can use success or failure as a facilitator or as a debilitator. If an athlete sees success or failure as a facilitator, he or she will use success or failure as a method to enhance his or her performance. But if an athlete sees success and failure as a debilitator, it means that the athlete does not have the ability or skills to use success or failure to his or her advantage. It seems that elite athletes may have the skills or ability to use success and failure as a facilitator and not as a debilitator owing to the fact that in the elite arena there is no place for errors. In this study, the researcher examines how elite and beginner athlete’s handle success and failure and what their reaction is towards success and failure. Each athlete has a unique way to develop his or her talents. Athletes who believe that they are born with limited talent or ability and cannot improve this talent by more practice or more effort can be classified as having a static mindset. When athletes believe that they can improve their talent or ability, they could be seen as athletes with a growth mindset. This study made use of a combination of convenient and random sampling. Each athlete had to comply with the criterium to be part of the study. The criterium stipulated that each athlete should be an active participant in sport either at school-, provincial-, national- or international level. To determine what goal orientation each athlete had, they were asked to fill out the task- and ego orientation in sport questionnaire. To determine what their reactions to success and failure were, athletes completed an assessment of success and failure questionnaire that was self-developed by the present researcher Roelie Potgieter and his study leader professor Ben Steyn. The self-theory questionnaire that was completed by the athletes determined whether an athlete was in the fixed or growth mindset. Using the results determined through the questionnaires that were completed by the athletes, correlations could be made to motivate the study. Task orientation and the growth mindset is more predominant than ego orientation and the fixed mindset. Athletes in general react more constructively towards success and failure. A strong correlation was found between task orientation and positive reaction to success and failure. Partial correlation between ego orientation and positive reaction to success was found. Positive relations were discovered between task orientation and the growth mindset, as well as ego orientation and the fixed mindset. AFRIKAANS : In vandag se sportloopbane is daar geen ruimte vir foute nie. Vir hierdie rede moet ‘n atleet ten alle tye op sy of haar beste wees. Dit is baie belangrik vir ‘n atleet om sy emosies in toom te hou, want somtyds kan die atleet se emosies bepaal of hy of sy sukses of mislukking gaan ervaar. Daarom is die doel van die studie om die reaksie van atlete op sukses en mislukking te bepaal. Die feit dat daar ‘n beperkte hoeveelheid navorsing oor die tema van die studie is beklemtoon weereens die belangrikheid van die studie. Elke atleet ervaar en reageer verskillend op sukses en mislukking. ‘n Atleet kan sukses of mislukking gebruik as ‘n fasiliteerder of as ‘n debiliteerder. As ‘n atleet sukses of mislukking sien as ‘n fasiliteerder, sal die atleet sukses of mislukking gebruik as ‘n metode om sy of haar prestasie/s te verbeter. Indien ‘n atleet sukses en mislukking sien as ‘n debiliteerder, beteken dit dat die atleet nie die vermoë of vaardighede het om sukses of mislukking te gebruik tot sy of haar voordeel nie. Dit wil voorkom dat elite atlete die vermoë of vaardighede het om sukses en mislukking te gebruik tot hulle voordeel, as gevolg van die feit dat daar geen plek vir foute tydens die kompetisie is nie. In die studie probeer die navorser bepaal hoe elite- en beginner atlete sukses en mislukking hanteer en wat hulle reaksie op sukses en mislukking is. Elke atleet het ‘n unieke manier om sy of haar talente te ontwikkel. Atlete wat glo dat hulle gebore is met ‘n talent of vermoë en kan nie die talent verbeter met oefening of ‘n groter poging kan geklassifiseer word as statiese instelling. Indien die atleet glo dat hulle, hulle talent kan verbeter, kan dit gesien word as ‘n groeiende instelling. Hierdie studie maak van die gemaklike sowel as die ewekamsige steekproefmetode gebruik. Elke deelnemer moes voldoen aan sekere kriterium om deel te wees van die studie. Die studie se kriteria het beklemtoon dat elke atleet aktief betrokke in ‘n sekere sportsoort moet wees, mag dit wees op skool-, provinsiale-, nasionale- of internasionale vlak. Om te bepaal watter tipe doeloriëntering elke atleet is was hulle gevra om die taak en ego oriëntasie vraelys in te vul. Deur die verwysing kan bepaal word wat hulle reaksie is tot sukses en mislukking, was daar van die atlete verwag om die vrae oor sukses en mislukking te voltooi. Die selfteorie vraelys wat deur die atlete voltooi is, het bepaal of die atlleet ‘n statiese of groeinde instelling het. Deur gebruik te maak van die resultate van die vraelyste wat voltooi is deur die atlete kon daar korrelasies gemaak word. Taakoriëntasie en die groeiende instelling is meer dominant as die ego oriëntasie en die statiese instelling. Atlete in die algemeen reageer meer konstruktief teenoor sukses en mislukking. ‘n Sterk korrelasie was gevind deur taakoriëntasie en positiewe reaksie tot sukses en mislukking. Gedeeltelike korrelasie kon gemaak word tussen ego oriëntasie en positiewe reaksie tot sukses. ‘n Positiewe korrelasie kon gemaak word tussen taakoriëntasie en groeiende instelling, asook ego oriëntasie en statiese instelling. / Dissertation (MA)--University of Pretoria, 2011. / Biokinetics, Sport and Leisure Sciences / unrestricted

Les détecteurs à pixels Medipix ont été développés par la collaboration Medipix et permettent de faire de l'imagerie en temps réel. Leur surface active de près de $2\cm^2$ est divisée en 65536~pixels de $55\times 55\um^2$ chacun. Seize de ces détecteurs, les Medipix2, sont installés dans l'expérience ATLAS au CERN afin de mesurer en temps réel les champs de radiation produits par les collisions de hadrons au LHC. Ils seront prochainement remplacés par des Timepix, la plus récente version de ces détecteurs, qui permettent de mesurer directement l'énergie déposée dans chaque pixel en mode \textit{time-over-threshold} (TOT) lors du passage d'une particule dans le semi-conducteur. En vue d'améliorer l'analyse des données recueillies avec ces détecteurs Timepix dans ATLAS, un projet de simulation Geant4 a été amorcé par John Id\'rraga à l'Université de Montréal. Dans le cadre de l'expérience ATLAS, cette simulation pourra être utilisée conjointement avec Athena, le programme d'analyse d'ATLAS, et la simulation complète du détecteur ATLAS. Sous l'effet de leur propre répulsion, les porteurs de charge créés dans le semi-conducteur sont diffusés vers les pixels adjacents causant un dépôt d'énergie dans plusieurs pixels sous l'effet du partage de charges. Un modèle effectif de cette diffusion latérale a été développé pour reproduire ce phénomène sans résoudre d'équation différentielle de transport de charge. Ce modèle, ainsi que le mode TOT du Timepix, qui permet de mesurer l'énergie déposée dans le détecteur, ont été inclus dans la simulation afin de reproduire adéquatement les traces laissées par les particules dans le semi-conducteur. On a d'abord étalonné le détecteur pixel par pixel à l'aide d'une source de $\Am$ et de $\Ba$. Ensuite, on a validé la simulation à l'aide de mesures d'interactions de protons et de particules $\alpha$ produits au générateur Tandem van de Graaff du Laboratoire René-J.-A.-Lévesque de l'Université de Montréal. / The pixelated Medipix detectors have been developed by the Medipix Collaboration to perform real-time imaging. The semiconducting chip is divided into 65536 pixels of $55\times 55\um^2$ for a total active area of nearly $2\cm^2$. Because of their sensitivity to all kinds of particles, sixteen Medipix2 detectors (ATLAS-MPX) have been placed in the ATLAS detector and its cavern to measure for the radiation produced by the head-on proton collisions produced at the LHC. At the next ATLAS upgrade, the ATLAS-MPX network will be extended to include the Timepix detectors, the latest version that allows one to measure the total energy deposited in the semiconductor. To improve data analysis, a Geant4 simulation project of a Timepix detector was initiated by John Id\'arraga at the Université de Montréal. In the framework of the ATLAS experiment, this simulation could be used with Athena, the ATLAS analysis software, and the full ATLAS simulation. Due to their repulsivity, the charge carriers created by an incoming particle in the pixelated detector are spread over the surrounding pixels causing a charge sharing effect. An effective model has been developed to reproduce this effect without resolving the charge drift's differential equation. This model and the \textit{time-over-threshold} mode of the Timepix have been included in the simulation to reproduce the tracks left by the striking particles. First, one had to individually calibrate each pixel of the device with $\Am$ and $\Ba$ sources. The simulation's validation has been performed with low energy protons and $\alpha$ particles delivered by the van de Graaff Tandem at the Laboratoire René-J.-A.-Lévesque of the Université de Montréal.

Les détecteurs à pixels Medipix ont été développés par la collaboration Medipix et permettent de faire de l'imagerie en temps réel. Leur surface active de près de $2\cm^2$ est divisée en 65536~pixels de $55\times 55\um^2$ chacun. Seize de ces détecteurs, les Medipix2, sont installés dans l'expérience ATLAS au CERN afin de mesurer en temps réel les champs de radiation produits par les collisions de hadrons au LHC. Ils seront prochainement remplacés par des Timepix, la plus récente version de ces détecteurs, qui permettent de mesurer directement l'énergie déposée dans chaque pixel en mode \textit{time-over-threshold} (TOT) lors du passage d'une particule dans le semi-conducteur. En vue d'améliorer l'analyse des données recueillies avec ces détecteurs Timepix dans ATLAS, un projet de simulation Geant4 a été amorcé par John Id\'rraga à l'Université de Montréal. Dans le cadre de l'expérience ATLAS, cette simulation pourra être utilisée conjointement avec Athena, le programme d'analyse d'ATLAS, et la simulation complète du détecteur ATLAS. Sous l'effet de leur propre répulsion, les porteurs de charge créés dans le semi-conducteur sont diffusés vers les pixels adjacents causant un dépôt d'énergie dans plusieurs pixels sous l'effet du partage de charges. Un modèle effectif de cette diffusion latérale a été développé pour reproduire ce phénomène sans résoudre d'équation différentielle de transport de charge. Ce modèle, ainsi que le mode TOT du Timepix, qui permet de mesurer l'énergie déposée dans le détecteur, ont été inclus dans la simulation afin de reproduire adéquatement les traces laissées par les particules dans le semi-conducteur. On a d'abord étalonné le détecteur pixel par pixel à l'aide d'une source de $\Am$ et de $\Ba$. Ensuite, on a validé la simulation à l'aide de mesures d'interactions de protons et de particules $\alpha$ produits au générateur Tandem van de Graaff du Laboratoire René-J.-A.-Lévesque de l'Université de Montréal. / The pixelated Medipix detectors have been developed by the Medipix Collaboration to perform real-time imaging. The semiconducting chip is divided into 65536 pixels of $55\times 55\um^2$ for a total active area of nearly $2\cm^2$. Because of their sensitivity to all kinds of particles, sixteen Medipix2 detectors (ATLAS-MPX) have been placed in the ATLAS detector and its cavern to measure for the radiation produced by the head-on proton collisions produced at the LHC. At the next ATLAS upgrade, the ATLAS-MPX network will be extended to include the Timepix detectors, the latest version that allows one to measure the total energy deposited in the semiconductor. To improve data analysis, a Geant4 simulation project of a Timepix detector was initiated by John Id\'arraga at the Université de Montréal. In the framework of the ATLAS experiment, this simulation could be used with Athena, the ATLAS analysis software, and the full ATLAS simulation. Due to their repulsivity, the charge carriers created by an incoming particle in the pixelated detector are spread over the surrounding pixels causing a charge sharing effect. An effective model has been developed to reproduce this effect without resolving the charge drift's differential equation. This model and the \textit{time-over-threshold} mode of the Timepix have been included in the simulation to reproduce the tracks left by the striking particles. First, one had to individually calibrate each pixel of the device with $\Am$ and $\Ba$ sources. The simulation's validation has been performed with low energy protons and $\alpha$ particles delivered by the van de Graaff Tandem at the Laboratoire René-J.-A.-Lévesque of the Université de Montréal.

Hälsosamma ekosystem försörjer oss med livsviktiga resurser och tjänster – ekosystemtjänster så som skydd mot översvämning. I Norra Östersjöns vattendistrikt, som Mälaren tillhör, är statusen på den ekosystemtjänsten dålig. Detta beror till stor del på en omfattande dikning och brist på svämplan i området. Under perioder med skyfall riskerar därför området runt Mälaren och dess tillrinnande vattendrag att drabbas av översvämningar som skadar matproduktion, infrastruktur och miljö. Övergödning är redan ett problem i området och stora tillskott av fosfor till följd av översvämmade jordbruksmarker kan orsaka stora algblomningar och försämrad livsmiljö för vattenlevande organismer. Under augusti och september 2023 föll ovanligt stora mängder regn över mellersta Sverige vilket ökade vattenföringen i vattendragen runt Mälaren och översvämmade vissa av dem. Högfrekventa turbiditetsmätningar från in-situ sensorer installerade i Sagån, Hågaån och Fyrisån, tre vattendrag i Mälarens avrinningsområde, har använts för att undersöka skyfallens effekter på deras vattenföring och beräknad fosfortransport. Resultaten visade en signifikant korrelation mellan ökad vattenföring och ökad fosfortransport, en signifikant ökning under 2023 jämfört med 2018–2022 och signifikanta skillnader mellan vattendragen. Översvämmade Sagån hade extremt höga toppar i beräknad fosfortransport. Resultaten indikerar att övergödningsproblemen i Mälaren kan förvärras i ett framtida klimat med mer intensiva skyfall om inte åtgärder tas för att stärka avrinningsområdets förmåga att hantera stora mängder nederbörd. / Healthy ecosystems provide us with vital resources and services – ecosystem services such as flood protection. In the North Baltic Sea Water District, to which Lake Mälaren belongs, the status of that ecosystem service is poor, largely as a result of extensive draining in the area leading to a lack of floodplains. During periods of torrential rain, the area around Lake Mälaren and its tributaries is therefore at risk to be affected by floods that cause damage to food production, infrastructure and the environment. Eutrophication is already a problem in the area and large additions of phosphorus as a result of flooded agricultural land can cause large algal blooms and degraded habitat for aquatic organisms. During August and September 2023, unusually large amounts of rain fell over central Sweden, which increased the flow of water in Lake Mälarens tributaries and flooded some of them. High frequency turbidity data from in-situ sensors installed in Sagån, Hågaån and Fyrisån, three tributaries to Lake Mälaren, was used to study the effects of the heavy rains on their waterflow and estimated phosphorus transport. The results showed a significant correlation between increased water flow and increased phosphorus transport, a significant increase in 2023 compared to 2018-2022 and significant differences between the tributaries. Flooded Sagån had extremely high peaks in estimated phosphorus transport. The results indicate that the eutrophication problems in Lake Mälaren may worsen in a future climate with more intense downpours unless measures are taken to strengthen the catchment's ability to handle large amounts of rainfall.

Suicide and suicidal attempts have increased over the years and the phenomenon is rapidly increasing countrywide. The rate in increase has not been happe•ning only internationally, but has unsettlingly noted to be rising in South Africa, too. Suicidal attempt has become one of the biggest social problems amongst the youths, and a problem that society has to grapple with. According to the media and statistics presented, the youth engage with destructive behavior and attempted suicide is rampant amongst Black adolescents. The young person imitates his peers and is constantly under pressure to do as the group does. Thus conformity and acceptance are the core words. The adolescent attempts suicide to solve problems. Various reasons are given for suicidal attempts and the youth names amongst others family problems, academic issues, relationship problems and so forth. In the attempt to take own life. different methods are used to commit suicide which range from overdosage, especially amongst females, to ingestion of harmful substances like bleach (clothes detergent) and hair products. Amongst males, more drastic actions in method of attempting suicide are used like hanging, gunshot and jumping from high places like bridges and buildings. There are also instances of self-inflicted burning (immolation) in some cases. Black youths have been found in recent years to engage in suicide and suicidal tendencies, whereas in previous years the tendency was almost non-existent. This calls for an investigation in Black adolescents' way of life and specifically in what their needs are. The latter is drawn from the profile presented; a task which was not easy as there exist little or no literature in this regard. This study should thus be seen as a precursor for further and more comprehensive and exclusive research especially on the social functioning of Blacks and their communities, in general. The results should be used to have sustainable school programmes aimed at the youth in general, but specifically those at risk and displaying destructive behaviour. / PhD (Social Work), North-West University, Potchefstroom Campus, 2014

Suicide and suicidal attempts have increased over the years and the phenomenon is rapidly increasing countrywide. The rate in increase has not been happe•ning only internationally, but has unsettlingly noted to be rising in South Africa, too. Suicidal attempt has become one of the biggest social problems amongst the youths, and a problem that society has to grapple with. According to the media and statistics presented, the youth engage with destructive behavior and attempted suicide is rampant amongst Black adolescents. The young person imitates his peers and is constantly under pressure to do as the group does. Thus conformity and acceptance are the core words. The adolescent attempts suicide to solve problems. Various reasons are given for suicidal attempts and the youth names amongst others family problems, academic issues, relationship problems and so forth. In the attempt to take own life. different methods are used to commit suicide which range from overdosage, especially amongst females, to ingestion of harmful substances like bleach (clothes detergent) and hair products. Amongst males, more drastic actions in method of attempting suicide are used like hanging, gunshot and jumping from high places like bridges and buildings. There are also instances of self-inflicted burning (immolation) in some cases. Black youths have been found in recent years to engage in suicide and suicidal tendencies, whereas in previous years the tendency was almost non-existent. This calls for an investigation in Black adolescents' way of life and specifically in what their needs are. The latter is drawn from the profile presented; a task which was not easy as there exist little or no literature in this regard. This study should thus be seen as a precursor for further and more comprehensive and exclusive research especially on the social functioning of Blacks and their communities, in general. The results should be used to have sustainable school programmes aimed at the youth in general, but specifically those at risk and displaying destructive behaviour. / PhD (Social Work), North-West University, Potchefstroom Campus, 2014