The aim of this study is to increase the understanding of why young women use sex as a form of self-injury. The empiricism consists of fifteen life stories either written by the young women themselves or with the help of an author. The study is based on a narrative method and the theoretical framework is founded on Goffman’s role theory; Goffman’s theory of social stigma and the concept of shame. The result of the study shows among other things that the young women often describe themselves as disgusting, filthy and have feelings of self- hatred and shame. They self-harm through sexual intercourse or acts as a way to regulate and relieve anxiety, but it only helps in the short run as the anxiety tends to get even stronger than before which leads to more self-harm. The young women often end up in a vicious circle that is hard to break. Furthermore the young women describe their upbringings lacking the presence and love of their parents.

ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California / Due to vehicle dynamics in mobile systems, GPS signal reception may be blocked by the body of the vehicle. This paper discusses various studies made on some vehicles such as the Space Shuttle, various aircraft, and analyzes the implementation of dual GPS antenna systems. Constructive and destructive interference characteristics of signal combining are considered. The author suggests an approach which uses a delay line on one of the antennas while analyzing the front end C/N0 needed for L1 GPS reception. An embedded Excel spreadsheet provides a front-end Noise Figure (NF) calculation tool based on user selected parameters.

This thesis describes methods for transforming applicative programs with the aim of improving their efficiency. The general justification for these techniques is presented via the concept of abstract interpretation. The work can be seen as providing mechanisms to optimise applicative programs for sequential von Neumann machines. The chapters address the following subjects. Chapter 1 gives an overview and gentle introduction to the following technical chapters. Chapter 2 gives an introduction to and motivation for the concept of abstract interpretation necessary for the detailed understanding of the rest of the work. It includes certain theoretical developments, of which I believe the most important is the incorporation of the concept of partial functions into our notion of abstract interpretation. This is done by associating non-standard denotations with functions just as denotational semantics gives the standard denotations. Chapter 3 gives an example of the ease with which we can talk about function objects within abstract interpretive schemes. It uses this to show how a simple language using call-by-need semantics can be augmented with a system that annotates places in a program at which call-by-value can be used without violating the call-by-need semantics. Chapter 4 extends the work of chapter 3 by showing that under some sequentiality restriction, the incorporation of call-by-value for call-by-need can be made complete in the sense that the resulting program will only possess strict functions except for the conditional. Chapter 5 is an attempt to apply the concepts of abstract interpretation to a completely different problem, that of incorporating destructive operators into an applicative program. We do this in order to increase the efficiency of implementation without violating the applicative semantics by introducing destructive operators into our language. Finally, chapter 6 contains a discussion of the implications of such techniques for real languages, and in particular presents arguments whereby applicative languages should be seen as whole systems and not merely the applicative subset of some larger language.

Thesis (MSc) -- Stellenbosch University, 2013. / ENGLISH ABSTRACT: Suicidal behaviour is a serious public health problem. Globally and in South Africa a gendered pattern of suicide rates has been observed, with males being more likely to kill themselves than females. To date little quantitative and qualitative research is available on young male suicidal behaviour in South Africa. This study investigated the attitudes, beliefs and myths young male students hold about suicidal behaviour. Thirteen male university students (ages 20 to 25 years; with and without a history of suicidal behaviour), who volunteered to take part in the present study in response to an email invitation, were interviewed. The attitudes, beliefs and myths identified from the qualitative data are grouped into four themes: 'Moral acceptability of suicidal behaviour', 'Perceived causes and risk factors of suicidal behaviour', 'Perceived motives of suicidal behaviour', and 'Perceived prevention and protective factors of suicidal behaviour'. Besides these four themes, two underlying narratives are identified and discussed: (1) 'Apart or a part: Belonging and suicidal behaviour' is centred on the idea that perceiving oneself to be an integral part of a social system is protective against suicidal behaviour, while a thwarted sense of belonging increases vulnerability to suicidal behaviour. (2) 'Dying to be a man: (Re) negotiating masculinity and suicidal behaviour' is concerned with participants' views that men's relational position to hegemonic (socially most dominant) forms of masculinity is a factor in male suicidal behaviour. Participants regard hegemonic forms of masculinity to be both a part of the problem of suicidal behaviour and a potential solution to suicidal behaviour. These findings are interpreted through a social constructionist lens of gender as performance. Finally, implications of findings for future research, prevention and treatment are discussed. / AFRIKAANSE OPSOMMING: Selfmoordgedrag is 'n ernstige openbare gesondheidsprobleem. Wêreldwyd en in Suid-Afrika is mans meer geneig as vrouens om selfmoord te pleeg. Tot op hede is daar min kwantitatiewe en kwalitatiewe navorsing beskikbaar van jong manlike selfmoordgedrag in Suid-Afrika. Hierdie studie ondersoek die houdings, oortuiging en mites oor selfmoordgedrag van jong manlike studente. Dertien manlike universiteitstudente (ouderdomme 20 tot 25 jaar, met en sonder 'n geskiedenis van selfmoordgedrag) het vrywillig aan die huidige studie deel geneem in reaksie op 'n e-pos uitnodiging. Die houdings, oortuiging en mites wat vanaf die kwalitatiewe data geïdentifiseer is, is in vier temas gegroepeer: 'Morele aanvaarbaarheid van selfmoordgedrag', 'Siening van die oorsake en risiko faktore van selfmoordgedrag', 'Waargenome motiewe van selfmoordgedrag', en 'Waargenome voorkoming en beskermende faktore van selfmoordgedrag'. Naas hierdie vier temas, is twee onderliggende temas geïdentifiseer en bespreeek: (1) 'Samehorigheid en selfmoordgedrag' is gemoeid met die idee dat om 'n integrale deel van 'n sosiale sisteem te wees is beskermend teen selfmoordgedrag, terwyl 'n persepsie van isolasie tot selfmoordgedrag kan lei. (2) 'Onderhandeling van manlikheid en selfmoordgedrag' is gemoeid met die deelnemers se sienings dat mans se verhouding tot hegemoniese vorme (sosiaal mees dominante vorme) van manlikheid 'n faktor in manlike selfmoordgedrag is. Deelneemers beskou hegemoniese vorme van manlikheid as beide 'n deel van die probleem en 'n moontlike oplossing vir selfmoordgedrag. Hierdie bevindinge is geïnterpreteer deur middel van 'n sosiale konstruksionistiese lens van geslag as prestasie. Die implikasies van die bevindings vir toekomstige navorsing, voorkoming en behandeling word ten slotte bespreek.

The aim of this thesis is to study trust in military leaders. Empirical data was gathered through interviews and questionnaires with military personnel mostly from Sweden, but also from four other European countries. Paper I illustrates that trust in military leaders can be theoretically understood in terms of a hierarchical system of categories, higher-level categories and two superior categories labelled Individual-related and Communication- and relationship-related characteristics. Paper II examines how trust between military leaders and their subordinates is related to negative critical incidents in international operations. The results show that trust can be affected by pre-existing influences, of both an individual and contextual nature. The level of trust that develops between leaders and subordinates appears to have an influence on perceptions and re-evaluations of leaders’ trustworthiness during and after involvement in critical incidents. In Paper III, an instrument, Destrudo-L, was developed to measure destructive leadership behaviours on five different dimensions: Arrogant, unfair, Threats, punishments, overdemands, Ego-oriented, false, Passive, cowardly, and Uncertain, unclear, messy. In Paper IV the relationship between constructive and destructive leadership behaviours and trust is examined. The results show that constructive leadership contributed most to trust in the immediate supervisor. A great deal of trust in immediate supervisors can be understood by evaluating both constructive and destructive leadership behaviours. This thesis contributes with context-specific knowledge on trust in leaders in a military context and knowledge of psychological processes and individual dispositions that shape and change the willingness to trust leaders. The main findings presented in this thesis are the identification of characteristics of the trustor, the trustee, and the context which influences trust in military leaders.

Crystallographic texture in polycrystalline HCP and cubic materials, often developed during thermomechanical deformations, has profound effects on properties at the macroscopic or component level. Given the respective natures of current detection techniques, a non-destructive, three-dimensional bulk texture detection method for these materials has not yet been developed. This thesis aims to achieve this goal through systematic studies on the relationship between ultrasonic wave velocity and texture. The feasibility of such development is firstly reviewed via the combination of computational and experimental studies on exemplary HCP materials. Numerical results obtained via a representative volume element (RVE) methodology reveal that the wave speed varies progressively and significantly with changing texture, and experimental ultrasound studies combined with EBSD characterisation demonstrate distinguished velocity profiles for samples with different textures. Thus the possibility of the development is demonstrated from these combined results. A novel convolution theorem is then presented, which couples the single crystal wave speed (the kernel function) with polycrystal orientation distribution function to give the resultant polycrystal wave speed function. Firstly developed on HCP and then successfully extended to general anisotropic materials, the theorem expresses the three functions as harmonic expansions thus enabling the calculation of any one of them when the other two are known. Hence, the forward problem of determination of polycrystal wave speed is solved for all crystal systems with verifications on varying textures showing near-perfect representation of the sensitivity of wave speed to texture as well as quantitative predictions of polycrystal wave speed. More importantly, the theorem also presents a solution to the long-standing inverse problem for HCP and cubic materials, with proof of principle established where groups of HCP and cubic textures are recovered solely from polycrystal wave velocities through the theorem and the results show good agreements with the original textures. Therefore the theorem opens up the possibility of developing a powerful technique for bulk texture measurement and wave propagation studies in HCP, cubic materials and beyond.

Non-Destructive Testing of industrial components carries vital importance, both financially and safety-wise. Among all Non-Destructive techniques, Long Range Ultrasonic Testing utilizing the guided wave phenomena is a young technology proven to be commercially valid. Owing to its well-documented analytical models, Ultrasonic Guided Waves has been successfully applied to cylindrical and plate-like structures. Its applications to complex structures such as multi-wire cables are fairly immature, mainly due to the high complexity of wave propagation. Research performed by the author approaches the long range inspection of overhead transmission line cables using ultrasonic guided waves. Existing studies focusing on guided wave application on power cables are extremely limited in inspection range, which dramatically degrades its chances of commercialization. This thesis consists of three main chapters, all of which approaches different problems associated with the inspection of power cables. In the first chapter, a thorough analysis of wave propagation in ACSR (most widely used power cable) cables is conducted. It is shown that high frequency guided waves, by concentrating the energy on the surface layers, can travel much further in the form of fundamental longitudinal wave mode, than previous studies have shown. Defect detection studies proved the system’s capability of detecting defects which introduce either increase or decrease in cross sectional area of the cable. Results of the chapter indicate the detectability of defects as small as 4.5% of the cross sectional area through a 26.5 meter long cable without any post-processing. In the second chapter, several algorithms are proposed to increase the inspection range and signal quality. Well-documented wavelet-denoising algorithm is optimized for power cables and up to 24% signal-to-noise ratio improvement is achieved. By introducing an attenuation correction framework, a theoretical inspection range of 75 meters is presented. A new framework combining dispersion compensation and attenuation correction is proposed and verified, which shows an inspection range of 130 meters and SNR improvement up to 8 dBs. Last chapter addresses the accurate localization of structural defects. Having proven the optimum excitation and related wave propagation in ACSR cables, a system having a more complex wave propagation characteristics is studied. A new algorithm combining pulse compression using Maximal Length Sequences and dispersion compensation is applied to multi-modal signals obtained from a solid aluminum rod. The algorithm proved to be able to improve signal quality and extract an accurate location for defects. Maximal Length Sequences are compared to chirp signals in terms of SNR improvement and localization, which produced favourable results for MLS in terms of localization and for chirp in terms of SNR improvement.

Lors de la détection de phénomènes non-linéaires faibles dans les solides, dans le cadre de l’évaluation non-destructive par ultrasons, les non-linéarités des céramiques piézoélectriques, éléments actifs des transducteurs ultrasonores, peuvent introduire des effets parasites. L’objectif de la thèse est de caractériser les propriétés non-linéaires de ces céramiques et de prédire l’influence de celles-ci sur la propagation d’ondes ultrasonores. Une méthode de caractérisation non-linaire basée sur l’analyse de la génération de second harmonique sur un résonateur piézoélectrique sous excitation électrique est ici développée. On montre que l’analyse des taux de distorsions permet de distinguer différentes sources de non-linéarité, mécanique ou électromécanique, impliquées dans la génération harmonique. L’influence de la charge acoustique sur le comportement vibratoire non-linéaire de la céramique est ensuite étudiée. L’ensemble des résultats obtenus est utilisé pour prédire l’influence de la non-linéarité de la céramique piézoélectrique sur la propagation d’ondes acoustiques dans un milieu extérieur. / During the detection of nonlinear phenomena in solids, under the non-destructive evaluation by ultrasound, nonlinearities of piezoelectric ceramics might introduce parasitic effects that could disrupt the measurements. The objective here is to characterize the nonlinear properties of these ceramics and predict their influence on the propagation of ultrasonic waves. A method to characterize nonlinear properties based on the analysis of the generation of second harmonic on a piezoelectric resonator is developed here. It is shown that the analysis of the distortions for a wide range of excitation frequencies, allow to distinguish different sources of nonlinearity. Thereafter, the influence of an acoustic load on the nonlinear behaviour of vibration is studied. Finally, the previous results are used to predict the influence of non-linearity of piezoelectric ceramic on the propagation of acoustic waves in an environment outside.

Thesis (M.A.)--University of the Witwatersrand, Faculty of Humanities, 1991. / This study examines factors associated with attempted suicide during adolescence. The sample consists of 10 Black adolescent girls who atempted suicide in the past year, and were admitted to Baragwanath Hospital. Each subject was questioned on demographic information and completed the Separation Anxiety Test (Hansburg, 1972) and Section 1 of the Inventory of Parent and Peer Attachment (Armsden and Greenberg, 1987), which assesses attachment to a parent. Subjects were also required to answer questions on their choice of responses. Common trends were found to exist among adolescent girls who attempt suicide. Adolescent girls who attempt suicide have disruptive home environments where parents experience marital problems. They show a low degree of attachment, high degree of hostility, stress avoidance during the stage of identity crisis, and they maintain a poor attachment-individuation balance. These findings suggest that the most common treatment strategy, ie. crisis intervention is not sufficient as it does not deal with underlying problems of adolescent suicide.

Os Ensaios Não Destrutivos (END), são aplicados em testes de qualidade de componentes e de máquinas. Estes elementos não teriam um bom desempenho se fossem concebidos alheios à qualidade do projeto, aos materiais envolvidos, aos processos de fabricação e à metodologia de inspeção e manutenção. Um alto nível de tecnologia é aplicado com um objetivo específico, ou seja, à garantia da qualidade dos componentes e do bom funcionamento dessas máquinas, seja na indústria e na geração e conversão de energia, incluindo a nuclear. A globalização nos diversos ramos da indústria leva a um aumento na quantidade de projetos e produtos contextualmente multinacionais. Surgem, as seguintes questões: como assegurar que os componentes e os processos utilizados se disponhem de alto índice na qualidade? Como otimizar os métodos e os rocessos de teste de materiais para assegurar a isenção de defeitos que possam afetar o esempenho dos componentes? As respostas para as questões se encontram notadamente na aplicação dos END. A análise de materiais complexos (não homogêneos) por meio de END requer um estudo detalhado dos sinais de resposta dos sensores. Um sistema de medidas e controle de processos não destrutivos usando radiação gama ou beta, em função do material a ser analisado foi desenvolvido. Esse sistema envolve: (a) Interface de entrada/saída (Hardware) e (b) Interface gráfica (Software). Na análise não destrutiva faz-se a comparação do sinal proveniente do sensor com um sinal preestabelecido (Set Point) ou sinal de referência, o qual é ajustado na Interface de entrada/saída. Após o processamento geral, o sistema tomará a decisão de rejeitar ou não o material analisado. A Interface de entrada/saída é implementada por um equipamento eletrônico constituído pelo MCS51, com a finalidade de fornecer um meio físico para troca de nformações, via de comunicação serial RS232, entre o sensor e o microcomputador . A Interface gráfica (programa computacional) foi escrita em linguagem C++ visual. / Nondestructive Assay (NDA) is applied to machines and components quality tests. These elements would not have a good performance if they were conceived without concern about the mechanical project quality, used materials, manufacture processes and inspection and maintenance methodology. There are constant developments in high level of technology with the objective of guaranteeing the components quality and the good functioning of these machines, in the mechanics, naval, aeronautical, petrochemical and steel industry, energy and nuclear generation as well. The globalization in the industry lines is a fact, leading to an increase in the multinational projects and products. The following questions arise: how to assure the high quality of components and processes? How to optimize the test methods to assure that the materials do not have defects affecting the performance of the components? The answers to the questions above are found in the application of NDA. The complex materials analysis (inhomogeneous) using NDA requires a detailed study of the sensors response signal. In this work, a measure and control system of non destructive processes was developed, using a radioactive source with a defined energy in function of the material to be analyzed. This system involves: (a) Interface of input/output (I/O) (the Hardware) and (b) graphical Interface (Software). In the non destructive analysis, it is made the comparison of the signal proceeding from the sensor with a signal preset (Set Point) or analogical signal of reference (Base Line), which is adjusted in the I/O Interface. Analyzed the signal, the system will make the decision: (a) to reject or (b) to accept the analyzed material. The I/O Interface is implemented by electronic equipment with a MCS51. The purpose of this interface is to supply conditions to exchange information, using serial RS232, between the sensor and the microcomputer. The graphical Interface (software) is written in visual C++ language.