Wastewaters from intensive agricultural activities contain high concentrations of nitrogen and phosphorus that contributes to water management problems. During the past few years, there has been considerable interest in the use of constructed wetlands for treating surface water runoff from farmyards. If the contaminated runoff is not treated, this wastewater along with other non-point sources of pollution can seriously contaminate the surface water and groundwater. Integrated Constructed Wetlands (ICWs) are a type of free water surface wetlands. They are engineered systems that are designed, constructed and operated successfully for treating farmyard runoff in the British Isles. However, the long-term treatment performance of these systems, the processes involved in contaminant removal and the impact on associated water bodies are not well-known. The aims of this project were to assess the performance of full-scale integrated constructed wetlands and understand nutrient removal in them. Performance evaluation of these systems through physical, chemical and microbiological parameters collected for more than 7 years showed good removal efficiencies compared to international literature. The monitored nutrient concentrations in groundwater and surface waters indicate that ICW systems did not pollute the receiving waters. The role of plants (Typha latifolia) and sediment in removing nutrients was also assessed. More nitrogen and phosphorus were stored in wetland soils and sediments than in plants. The results demonstrate that the soil component of a mature wetland system is an important and sustainable nutrient storage compartment. A novel molecular toolbox was used to characterise and compare microbial diversity responsible for nitrogen removal in sediment and litter components of ICW systems. Diverse populations of nitrogen removing bacteria were detected. The litter component of the wetland systems supported more diverse nitrogen removing bacteria than the sediments. Nitrogen removing bacteria in the wetland systems appeared to be stochastically assembled from the same source community. The self-organising map model was applied as a prediction tool for the performance of ICW and to investigate an alternative method of analysing water quality performance indicators. The model performed very well in predicting nutrients and biochemical oxygen demand with easy to measure and cost-effective water quality parameters. The results indicate that the model was an appropriate approach to monitor wastewater treatment processes and can be used to support management of ICW in real-time.

Darbo objektas: pramoginių orientacinių varžybų organizavimo poreikis Lietuvos liaudies buities muziejuje. Darbo tikslas: nustatyti pramoginių orientacinių varžybų organizavimo poreikį Lietuvos liaudies buities muziejuje. Darbo uždaviniai: 1. Pateikti renginių organizavimo sampratą ir klasifikavimą; 2. Apibrėžti sportinių renginių organizavimo ypatumus; 3. Atskleisti pramoginių orientacinių varžybų organizavimo ir formavimo etapus; 4. Ištirti ir įvertinti pramoginių orientacinių varžybų poreikį Lietuvos liaudies ir buities muziejuje; Tyrimo metodai: 1. Mokslinės literatūros analizė; 2. Anketinė apklausa; 3. Aprašomoji statistinė analizė. Rezultatai, išvados, pasiūlymai Atitinkami veiksniai, organizuojant ir klasifikuojant renginius, iš jų reikalauja vientisumo ir išbaigtumo, kad pasiteisintų darbo pradžioje iškelti tikslai ir būtų įgyvendinti uždaviniai. Apibendrinus gautus viso tyrimo rezultatus galima pateikti išvadą, kad dalyvavimas orientacinių varžybų programoje respondnetų nuomone suteikia galimybę jiems išnaudoti visas savo galimybes siekiant socialinės įtraukties, tuo pačiu, tai galimybė siekti pripažinimo bei saviraiškos, įvertinant savo fizinį pasirengimą. Atlikus tyrimą buvo nustatyta, kad dauguma apklaustųjų renkasi aktyvias laisvalaikio praleidimo formas, siekdami realizuoti save kaip asmenybę neįprastoje aplinkoje. Orientavimosi sportas – tai išskirtinė sporto šaka, kurios pagrindą sudaro fizinių galimybių, dėmesio ir atminties lavinimas, sugebėjimas... [toliau žr. visą tekstą] / The object of the work: organization demand for entertaining orientation matches. The aim of the work: to measure the demand for organising entertaining orientation matches in the Open Air Museum in Lithuania. The goals of the work: 1. To present the conception and classification of organising events; 2. To define the peculiarities of organising sports events; 3. To reveal stages of organisation and formation of entertaining orientation matches; 4. To survey and estimate the demand for organising entertaining orientation matches in the Open Air Museum in Lithuania; Methods of survey: 1. Analysis of scientific literature; 2. Questionnaire; 3. Descriptive statistics. Results, conclusions, suggestions Some actions in organising and classifying events require integrity and perfection in order to justify the aims and goals that were set at the beginning of this work. After summarising the results of the survey the opinion of the respondents show that participation in the orientation matches gives them opportunities to better incorporate into the society. At the same time it is a perfect opportunity to seek acceptance and self-expression evaluating fitness. The survey showed that most respondents prefer active forms of pastime in aspiring to realise themselves as personalities. Orientation sport is an exclusive branch of sports the basis of which is not only to train body, attention and memory but also to train the ability to think quickly and rationally. Having in mind the... [to full text]

I avhandlingen beskrivs och analyseras chefers arbete genom att kombinera individuella perspektiv med organisatoriska och samhälleliga perspektiv vilket ger både teoretiska och praktiska implikationer Referensramen är uppbyggd av teorier kring chefers arbete och nyinstitutionell teori av Skandinaviskt slag. Flera metoder kombineras för att fånga komplexiteten i chefers arbete; skuggningar, intervjuer, observationer och dokumentstudier. Forskningsfrågorna besvaras genom att använda en kombination av teorier utvecklade för olika analysnivåer; individ, organisation och samhälle. De empiriska materialen används för att ge ett bidrag till vidare forskning om chefers arbete med en empirisk bas. Vikten av att relatera chefers arbete till den kontext som omger dem betonas. Chefers arbete i äldreomsorgen har specifika karaktäristika men också gemensamma drag med chefers arbete i andra sektorer och på andra organisatoriska nivåer. I det empiriska materialet har flera organisatoriska karaktäristika som påverkar chefers arbete identifierats. Beskrivningarna av chefers arbete bidrar också till en utveckling av en empirinära praxisteori för chefers arbete. Med hjälp av nyinstitutionell teori beskrivs hur chefer möter skilda förväntningar och krav och i organisationer, där dessa inte överensstämmer måste chefer hantera ett organisatoriskt hyckleri. / In the thesis managers’ work is described and analysed by combining individual perspectives with organisational and societal perspectives, which gives both theoretical and practical implications. The frame of reference is constituted of theories on managers’ work and the Scandinavian version of new institutional theory. Several methods are combined to grasp the complexity in mangers’ work; shadowing, interviews, observations and document studies. The research questions are answered through a combination of theories  developed for different levels of analysis; individual, organisational and societal. The empirical materials are used to give a contribution to further research on managers’ work with an empirical base. The importance to relate managers’ work to the context that surrounds them is emphasised. Managers’ work in eldercare has specific characteristics, but also common features with managers’ work in other sectors and at other hierarchical levels in organisations. In the empirical material several organisational characteristics that affect managers’ work have been identified. The descriptions of managers’ work also contribute to a praxis theory of management. New institutional theory is applied in order to describe how managers meet diverse expectations and demands in organisations. When these do not match, the managers need to handle organisational hypocrisy.

From the Polanyian perspective on the double movement of labour commodification and self-protection of Society, the aim of this study was to examine how unionists perceive and problematise precarious employment and what are their practices for unionising and thereby securing precarious workers. A double case study was conducted in the hotel-restaurant and construction sectors in Sweden with the participation of blue-collar unionists with diverse backgrounds and experiences. The results show that precarious work is associated with labour market segmentation, subcontracting and fragmentation of economic organisations, deskilling of work, loss of autonomy and sometimes over-qualification of workers. Perceived difficulties for unionisation are fear, lack of knowledge of precarious workers about their rights, membership cost, status frustration and lack of interactions with other workers. Reported practices for unionising precarious workers consist of dealing with these barriers in order to build trustful relations and empowering workers through education and inclusion in leadership positions. Actions taken to protect and secure precarious workers are strongly interlinked with their unionisation and seem to rest mainly on negotiations. The main conclusions of the study are that precarious work means a loss of control by workers over their work life stemming from labour commodification and flexibilisation due to increased management control and lack of rights and protections surrounding work. The formation of solidarities needed for unionisation is hindered by the detachment of precarious workers from the work community and by inequality regimes. The domination of fear manifests the prevalence of emotions. Therefore, the care and emotional work of unionists is essential for making workers feel confidence. Unions practices tend to lean also, to some extent, towards organising and community building models. Thereby, union agency appears to be able to engage in an interplay with structures to exert some influence on employment and industrial relations.

The purpose of this research study was to assess the control function of social work managers. The basic focus of the study is on how they perceive this management function of control as they exercise it, as well as how it is exercised to them. Out of two research methods that one can choose from, namely quantitative and qualitative, the quantitative was chosen as the relevant one to use because of the specific close-ended questions that were to be answered by respondents regarding the exercise of control as a management function. Out of twenty five (25) questionnaires, an analysis of data was done on twenty (N = 20), because that was the original target and the five were just distributed in case some could not answer for whatever reason. The findings and responses from the respondents were analysed and interpreted to meet the main objectives of the study. / Die doel van hierdie studie was om vas te stel wat die kontrole funksie van ’n maatskaplikewerk-bestuurder is. Hierdie studie is gefokus op hoe die bestuursfunksie beleef word soos dit beoefen word. Van die twee navorsingsmetodes waaruit gekies kan word, naamlik kwalitatief en kwantitatief, is daar besluit dat die kwantitatiewe metode meer relevant sal wees omdat dit spesifieke geslote vrae vra wat ingestel is op die bestuursfunksie van kontrole. Uit die 25 vraelyste is die data van 20 (N = 20) vraelyste ontleed, aangesien dit die aanvanklike teiken was. Daar is 5 ekstra uitgedeel net ingeval daar persone sou wees wat nie die vraelys kon voltooi nie. Die bevindinge en reaksie van die 20 ondervraagdes is ontleed en geïnterpreteer om die basiese doel van die studie te bereik. / Social Work / M. Diac. (Social Work)

Thesis (MScEng)--Stellenbosch University, 2013. / ENGLISH ABSTRACT: The shape of the knee’s trochlear groove is a very important factor in the overall stability of the knee. However, a quantitative description of the normal three-dimensional geometry of the trochlea is not available in the literature. This is also reflected in the poor outcomes of patellofemoral arthroplasty (PFA). In this study, a standardised method for femoral parameter measurements on three-dimensional femur models was established. Using software tools, virtual femur models were aligned with the mechanical and the posterior condylar planes and this framework was used to measure the femoral parameters in a repeatable way. An artificial neural network (ANN), incorporating the femoral parameter measurements and classifications done by experienced surgeons, was used to classify knees into normal and abnormal categories. As a result, 15 knees in the database were classified by the ANN as being normal. Furthermore, the geometry of the normal knees was analysed by fitting B-spline curves and circular arcs on their sagittal surface curves to prove and reconfirm that the groove has a circular shape on a sagittal plane. Self-organising maps (SOM), which is a type of ANN, was trained with the acquired data of the normal knees and in this way the normal trochlear geometry could be predicted. The prediction of the anterior-posterior (AP) distance and the trochlear heights showed an average agreement of 97 % between the actual and the predicted normal geometries. A case study was conducted on four types of trochlear dysplasia to determine a normal geometry for these knees, and a virtual surface reconstruction was performed on them. The study showed that the trochlea was deepened after the surface reconstruction, having an average trochlea depth of 5.5 mm compared to the original average value of 2.9 mm. In summary, this research proposed a quantitative method for describing and predicting the normal geometry of a knee by making use of ANN and the femoral parameters that are unaffected by trochlear dysplasia. / AFRIKAANSE OPSOMMING: Die vorm van die trogleêre keep is ’n belangrike faktor in patella-stabiliteit. Tog is ’n kwantitatiewe beskrywing van die normale driedimensionele geometrie van die troglea nog nie beskikbaar nie, wat duidelik blyk uit die swak uitkomste van patellofemorale artroplastie (PFA). In hierdie studie is ’n gestandaardiseerde metode vir die meting van femorale parameters op grond van driedimensionele femurmodelle ontwikkel. Die femurmodel is in lyn gebring met die meganiese en posterior kondilêre vlak, welke raamwerk gebruik is om die femorale parameters op ’n herhaalbare wyse te meet. Die normale knieë is geklassifiseer met ’n kunsmatige neurale netwerk (ANN), wat die femorale parameter-mate sowel as die chirurgiese klassifikasie ingesluit het, en 15 knieë is gevolglik as normaal aangewys. Die normaleknie-geometrie is ontleed deur B-latkrommes en sirkelboë op die sagittale oppervlak-kurwes aan te bring om te bewys en te herbevestig dat die keep uit ’n sirkelvorm op ’n sagittale vlak bestaan. Die ingesamelde data van die normale knieë is ingevoer by selfreëlende kaarte (SOM), synde ’n soort ANN, wat die navorser in staat gestel het om die normale trogleêre geometrie te voorspel. Die voorspelling van die anterior-posterior (AP) afstand en die trogleêre hoogtes toon ’n gemiddelde ooreenkoms van meer as 97 % tussen die werklike en voorspelde normale geometrie. ’n Gevallestudie is op vier soorte trogleêre displasie uitgevoer om die normale geometrie te voorspel en ’n oppervlakrekonstruksie daarop uit te voer. Hierdie studie het getoon dat die troglea ná oppervlakrekonstruksie verdiep was, met ’n gemiddelde trogleadiepte van 5.5 mm in vergelyking met die aanvanklike gemiddelde waarde van 2.9 mm. Hierdie navorsing het dus ’n metode aan die hand gedoen vir die kwantitatiewe beskrywing en voorspelling van normale geometrie met behulp van ANN sowel as met die femorale parameters wat nie deur die trogleêre displasie geraak word nie.

Thesis (PhD)--Stellenbosch University, 2011. / ENGLISH ABSTRACT: The knee is the largest, most complicated and incongruent joint in the human body. It sustains very high forces and is susceptible to injury and disease. Osteoarthritis is a common disease prevalent among the elderly and causes softening or degradation of the cartilage and subcondral bone in the joint, which leads to a loss of function and pain. This problem can be alleviated through a surgical intervention commonly termed a “knee replacement”. The aim of a knee replacement procedure is to relieve pain and restore normal function. Ideally, the knee replacement prosthesis should have an articulating geometry similar to that of the patient’s healthy knee, and must allow for normal motion. Unfortunately, this is often problematic since knee prostheses are supplied in standard sizes from a variety of manufacturers and each one has a slightly different design. Furthermore, commercial prostheses are not always able to restore the complex geometry of an individual patient’s original articulating surfaces. This dissertation shows that there is a significant variation between knee geometries, regardless of gender and race. This research aims to resolve the problem in two parts: Firstly by presenting a method for preoperatively selecting the optimal knee prosthesis type and size for a specific patient, and secondly by presenting a design procedure for designing and manufacturing patient-specific unicompartmental knee replacements. The design procedure uses mathematical modelling and an artificial neural network to estimate the original and healthy articulating surfaces of a patient’s knee. The models are combined with medical images from the patient to create a knee prosthesis that is patient-specific. These patient-specific implants are then compared to conventional implants with respect to contact stresses and kinematics. The dissertation concludes that patient-specific implants can have characteristics that are comparable to or better than conventional prostheses. The unique design methodology presented in this dissertation introduces a significant advancement in knee replacement technology, with the potential to dramatically improve clinical outcomes of knee replacement surgery. / AFRIKAANSE OPSOMMING: Die knie is die grootste, mees komplekse en mees ongelyksoortige gewrig in die liggaam. Osteoarthritis is ’n siekte wat algemeen by bejaardes voorkom en die versagting of agteruitgang van die kraakbeen en subchondrale bene in die gewrig tot gevolg het, wat tot ’n verlies van funksionering en pyn lei. Hierdie probleem kan verlig word deur ’n chirurgiese ingryping wat algemeen as ’n “knievervanging” bekend staan. Die doel van ’n knievervangingsprosedure is om pyn te verlig en normale funksionering te herstel. Ideaal gesproke behoort die knievervangingsprostese ’n gewrigsgeometrie te hê wat soortgelyk aan die pasiënt se gesonde knie is, en normale beweging moontlik maak. Ongelukkig is dit dikwels problematies aangesien knieprosteses in standaardgroottes en deur ’n verskeidenheid vervaardigers verskaf word, wat elkeen se ontwerp effens anders maak. Verder kan kommersiële prosteses nie altyd die komplekse geometrie van ’n individuele pasiënt se oorspronklike gewrigsoppervlakke vervang nie. Hierdie proefskrif wys dat daar ’n betekenisvolle variasie tussen knieafmetings is, afgesien van geslag en ras. Hierdie navorsing is daarop gemik om die problem op tweërlei wyse te benader: Eerstens deur ’n metode aan te bied om die optimal knieprostesetipe en -grootte vir ’n spesifieke pasiënt voor die operasie uit te soek, en tweedens om ’n ontwerpprosedure aan te bied vir die ontwerp en vervaardiging van pasiëntspesifieke unikompartementele knievervangings. Die ontwerpprosedure gebruik wiskundige modellering en ’n kunsmatige neurale netwerk om die oorspronklike en gesonde gewrigsoppervlakke van ’n pasiënt se knie te bepaal. Die modelle word met mediese beelde van die pasiënt gekombineer om ’n knieprostese te skep wat pasiëntspesifiek is. Hierdie pasiëntspesifieke inplantings word dan met konvensionele inplantings vergelyk wat kontakstres en kinematika betref. Daar word tot die slotsom gekom dat die pasiëntspesifieke inplantings oor eienskappe kan beskik wat vergelykbaar is met of selfs beter is as dié van konvensionele prosteses. Die unieke ontwerpmetodologie wat in hierdie proefskrif aangebied word, stel beduidende vordering in knievervangingstegnologie bekend, met die potensiaal om die kliniese uitkomste van knievervangingsoperasies dramaties te verbeter.

This study examines the use of discourse-organising nouns (DONs), such as fact, issue, and problem, in Swedish advanced students’ academic writing in second language (L2) English, and in what ways texts produced by the L2 students resemble or differ from those produced by advanced native-speaker (L1) students and from expert writing in this respect. The study uses corpus linguistic methodology and is set within the frameworks of Halliday’s systemic-functional linguistics and Granger’s Contrastive Interlanguage Analysis. Results show both similarities and differences across the writer groups. Noteworthy similarities include overall frequencies of DONs and their modifiers. Differences include variety of usage and register appropriacy. These differences were often the largest between the L2 student writing and the expert writing, though findings suggest that both student groups can usefully be thought of as learners of academic writing in English in this respect. Specifically, the students’ usage was found to be less varied than the expert writing, and to be characterised by more frequent use of semantically vague nouns (e.g., thing and fact) and nouns marking attitude and involvement (e.g., opinion and question). Other central findings include the tendency, on the part of the students, to use DONs less frequently in syntactic structures prototypical of formal academic prose, and to use them more frequently in structures with the potential to express stance, compared to the expert writing. The study also found more frequent use of evaluative modifiers of DONs in the student writing. In sum, the L2 student writing and, to a lesser extent, the L1 student writing, was found to approximate the corpus of expert writing in many respects, but with less variety, fewer markers of formality, and more frequent occurrences of interpersonal features in their use of DONs. The result is discourse that can in part be characterised as vague and subjective, as well as involved and informal. / This study examines the use of discourse-organising nouns (DONs), such as fact, issue, and problem, in Swedish advanced students’ academic writing in second language (L2) English, and in what ways texts produced by the L2 students resemble or differ from those produced by advanced native-speaker students and from expert writing in this respect. Results show both similarities and differences across the writer groups. Noteworthy similarities include overall frequencies of DONs and their modifiers. Differences include variety of usage and register appropriacy. In short, the L2 student writing and, to a lesser extent, the L1 student writing, was found to approximate the corpus of expert writing in many respects, but with less variety, fewer markers of formality, and more frequent occurrences of interpersonal features in their use of DONs. The result is discourse that can in part be characterised as vague and subjective, as well as involved and informal. These differences were often the largest between the L2 student writing and the expert writing, though findings suggest that both student groups can usefully be thought of as learners of academic writing in English in this respect.

Thesis. (M. Tech. (Mechanical Engineering))--Vaal University of Technology / Bearing condition monitoring and fault diagnosis have been studied for many years. Popular techniques are applied through advanced signal processing and pattern recognition technologies. The subject of the research was vibration condition monitoring of incipient damage in rolling element bearings. The research was confined to deep-groove ball bearings because of their common applications in industry. The aim of the research was to apply neural networks to vibration condition monitoring of rolling element bearings. Kohonen's Self-Organising Feature Map is the neural network that was used to enable an automatic condition monitoring system. Bearing vibration is induced during bearing operation and the main cause is bearing friction, which ultimately causes wear and incipient spalling in a rolling element bearing. To obtain rolling element bearing vibrations a condition monitoring test rig for rolling element bearings had to be designed and built. A digital vibration measurement acquisition environment was created in Labview and Matlab. Data from the bearing test rig was recorded with a piezoelectric accelerometer, and an S-type load cell connected to dynamic signal analysis cards. The vibration measurement instrumentation was cost-effective and yielded accurate and repeatable measurements. Defects on rolling element bearings were artificially inflicted so that a pattern of bearing defects could be established. An input data format of vibration statistical parameters was created using the time and frequency domain signals. Kohonen's Self-Organising Feature Maps were trained in the input data, utilising an unsupervised, competitive learning algorithm and vector quantisation to cluster the bearing defects on a two-dimensional topographical map. A new practical dimension to condition monitoring of rolling element bearings was developed. The use of time domain and frequency domain analysis of bearing vibration has been combined with a visual and classification analysis of distinct bearing defects through the application of the Self-Organising Feature Map. This is a suitable technique for rolling element bearing defect detection, remaining bearing life estimation and to assist in planning maintenance schedules. / National Research Foundation; Council for Scientific and Industrial Research

Network densification has become a dominant theme for capacity enhancement in cellular networks. However, it increases the operational complexity and expenditure for mobile network operators. Consequently, the essential features of Self-Organising Networks (SON) are considered to ensure the economic viability of the emerging cellular networks. This thesis focuses on quantifying the benefits of self-organisation in Cloud Radio Access Network (C-RAN) by proposing a flexible, energy efficient, and capacity optimised system. The Base Band Unit (BBU) and Remote Radio Head (RRH) map is formulated as an optimisation problem. A self-optimised C-RAN (SOCRAN) is proposed which hosts Genetic Algorithm (GA) and Discrete-Particle-Swarm-Optimisation algorithm (DPSO), developed for optimisation. Computational results based on different network scenarios demonstrate that DPSO delivers excellent performances for the key performance indicators compared to GA. The percentage of blocked users is reduced from 10.523% to 0.409% in a medium sized network scenario and 5.394% to 0.56% in a vast network scenario. Furthermore, an efficient resource utilisation scheme is proposed based on the concept of Cell Differentiation and Integration (CDI). The two-stage CDI scheme semi-statically scales the number of BBUs and RRHs to serve an offered load and dynamically defines the optimum BBU-RRH mapping to avoid unbalanced network scenarios. Computational results demonstrate significant throughput improvement in a CDI-enabled C-RAN compared to a fixed C-RAN, i.e., an average throughput increase of 45.53% and an average blocked users decrease of 23.149% is experienced. A power model is proposed to estimate the overall power consumption of C-RAN. Approximately 16% power reduction is calculated in a CDI-enabled C-RAN when compared to a fixed C-RAN, both serving the same geographical area. Moreover, a Divide-and-Sort load balancing scheme is proposed and compared to the SOCRAN scheme. Results show excellent performances by the Divide-and-Sort algorithm in small networks when compared to SOCRAN and K-mean clustering algorithm.