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We grow AB₂ random hyperbranched polymer structures in different ways and using different simulation methods. In particular we use a method of ad hoc construction of the connectivity matrix and the bond fluctuation model on a 3D lattice. We show that hyperbranched polymers split into two universality classes depending on the growth process. For a “slow growth” (SG) process where monomers are added sequentially to an existing molecule which strictly avoids cluster–cluster aggregation the resulting structures share all characteristic features with regular dendrimers. For a “quick growth” (QG) process which allows for cluster–cluster aggregation we obtain structures which can be identified as random fractals. Without excluded volume interactions the SG model displays a logarithmic growth of the radius of gyration with respect to the degree of polymerization while the QG model displays a power law behavior with an exponent of 1/4. By analyzing the spectral properties of the connectivity matrix we confirm the behavior of dendritic structures for the SG model and the corresponding fractal properties in the QG case. A mean field model is developed which explains the extension of the hyperbranched polymers in an athermal solvent for both cases. While the radius of gyration of the QG model shows a power-law behavior with the exponent value close to 4/5, the corresponding result for the SG model is a mixed logarithmic–power-law behavior. These different behaviors are confirmed by simulations using the bond fluctuation model. Our studies indicate that random sequential growth according to our SG model can be an alternative to the synthesis of perfect dendrimers.

An antinomy is a contradiction between a principle and its opposite, where there is a compelling case for accepting both. This thesis adopts the antinomy of local-state government in Australia as its central conceptual theme, describing it with the following defensible, but contradictory principles that:¶ · Australian local governments are statutory agencies of Australia’s state governments, with no power or authority beyond that which is ascribed to them by the states (the outside-in principle); and¶ · Local governments in Australia are independent agencies whose authority and interests transcend their regulatory powers by nature of their attachment to their local area (the inside-out principle).¶ The central conceptual theme of the antinomy of local-state government shapes the overall thesis, as well as providing the focus for its introduction and conclusion. The thesis induces elements of the antinomy and structures much of its discussion around these key issues. It does not try to prove or resolve the antinomy. Instead the thesis uses the concept to explore and develop its second complex theme - the practical and applied experience of Australian local governments (LGs) as they attempt to deliver beneficial environmental outcomes. The great bulk of the substantive work presented in the thesis focuses on descriptions and analyses of LGs’ environmental work and the contexts within which they do it. The thesis contends that the local-state antinomy underpins many problems facing Australian LGs as they attempt to deliver beneficial environmental outcomes. Four research questions are addressed. They are:¶ · How can Australian LG capacity to deliver beneficial environmental outcomes be understood?¶ · Within this capacity, what are the environmental outcomes now being achieved by Australian LGs?¶ · How can Australian local government extend its capacity to deliver beneficial environmental outcomes? And¶ · What are the implications of the local-state antinomy on Australian LG capacity to deliver beneficial environmental outcomes?¶ This thesis reviews literature on Australian LG, LG environmental work, and the methods that are appropriate in investigating these questions. The overall thesis uses scientific, grounded theory and action research methods and draws on ideas from symbolic interactionism. Parts of the thesis also use environmental risk assessment, gap analysis techniques, case study and comparative analysis. The goal of generating grounded theories led to a strong focus on the development and exploration of analytical categories and the relationships between them. One such category summarises the relationship between LG and state government (SG), whereby LGs are identified as the inside sphere of government, while the SG is one of several outside spheres. Environmental efforts that impact between the spheres are described in relation to their source and impact, using this terminology, so that inside-out initiatives are driven by LGs but impact more broadly, and outside-in initiatives are driven by states but impact on local areas.¶ Two extensive studies are presented, each stemming primarily from one side of the local-state antinomy. The first is a quantitative, statewide study of local (and state) government implementation of the Queensland Environmental Protection Act. That process is considered a predominantly outside-in environmental initiative, in that LG interest and authority for that work stem directly from a SG statute. For simplicity, this is referred to as an outside-in study. That study involved the development and application of the Comparative Environmental Risk Assessment Method, that enabled the assessment of the environmental and other outcomes from the Queensland legislation.¶ The outside-in study is complimented by comparative case studies that mostly reflect inside-out environmental initiatives as they are defined and described by LGs. Again, this required the development of innovative research methods, specifically a comparative case study method. 34 case studies gathered from different types of LGs across Australia are presented, each representing an attempt by LG to deliver beneficial environmental outcomes.¶ In answer to the research questions, LG capacity to deliver environmental outcomes can be understood when the antinomy is examined through the research methods and analytical categories developed and presented here. LGs are delivering significant beneficial environmental outcomes, both as agents of SGs and through their own initiatives. Improving LG capacity to deliver environmental outcomes primarily requires a respect for LG perspectives, and for LG priorities, which inherently include a focus on their own local areas. State governments can build effective partnerships between the spheres and enhance LG environmental capacity by recognising and supporting LG’s own priorities, while assisting their engagement with broader strategic objectives.

Les travaux réalisés au cours de cette Thèse ont contribué à améliorer l'estimation de l'humidité de surface du sol et de l'humidité racinaire sur la bande sahélienne en Afrique de l'ouest. La première partie a été consacrée à évaluer la capacité de différents algorithmes d'estimations de l'humidité du sol basées sur des mesures satellites dans le domaine spectral de l'infrarouge thermique. Dans un deuxième temps, une méthode a été développée dans le but d'obtenir une cartographie de l'humidité du sol à une résolution temporelle fine (< 3h) en se basant sur deux produits satellites: un produit satellite de précipitation et une cartographie journalière micro-onde sensible à l'humidité du sol. Dans un troisième temps, une évaluation de la fiabilité et de la robustesse de la méthodologie a été proposée. Enfin, une méthode semi-empirique a été utilisée afin de produire une cartographie de l'humidité de la zone racinaire (0-1 m) sur l'ensemble de la bande sahélienne. Les mesures de terrain obtenues sur trois sites situés au Mali, au Niger et au Bénin dans le cadre du programme AMMA ont servi de référence pour évaluer la qualité des estimations de l'humidité superficielle et racinaire à chaque étape de ce travail. Les résultats montrent qu'une estimation de l'humidité superficielle du sol est possible avec une précision de moins de 3 % vol. sur la bande sahélienne. L'erreur est de l'ordre de 5% vol. sur la zone soudanienne (Bénin). La précision est identique sur l'estimation de l'humidité racinaire. Enfin, la méthode développée permet parallèlement de corriger les produits satellites de précipitation et notamment la surestimation du cumul annuel et du nombre d'événements des trois produits satellites utilisés dans ce travail.

This thesis deals with issues around the implementation of an AMM (Automated Meter Management) system within the Czech electricity distribution system. The theoretical section of the thesis provides a historical context and looks at the development of the electricity sector. The thesis then goes on to discuss issues regarding the competitiveness of distribution companies in terms of IT/ICT use. This section defines the elements of the Smart Grid concept, in particular the AMM system. The chapters dealing with the conditions for implementing the system in the Czech Republic and pilot projects abroad make up the major sources for the practical section. The goal of the practical section is to come up with a project aim for the AMM system implementation trial project in Prague. The proposed project aim is divided into a number of separate tasks whose results are obtained using a detailed analysis of available sources and the conclusions of the theoretical part of the thesis. The thesis's main benefit is in forming a basis for the AMM implementation trial project in PREdistribuce, Inc. distribution networks and providing a comprehensive overview of the development and current state of the electricity sector.

This thesis is focused on demonstrating the impact of the implementation of decentralized distributed energy sources (mainly RES) and electromobility technologies to electrical parameters in Czech medium voltage distribution network. Thesis is divided into two main chapters. First one is a brief theoretical summary of this problematic and the second one is a practical software simulation on a real medium voltage network. Proposed implementation scenarios are based on EU and national strategic plans for time period from 2020 to 2040.

In this project, the performance aspects of a new early generation 1310 nm Sampled-Grating Distributed Bragg Reflector (SG-DBR) semiconductor laser are investigated. SG-DBR lasers are ideal for Source Swept Optical Coherence Tomography (SS-OCT), a Fourier-Domain based approach for OCT, necessitating a tunable wavelength source. Three internal sections control the frequency output for tuning, along with two amplifiers for amplitude control. These O-band SG-DBR devices are now being produced in research quantities. SG-DBR lasers have been produced at 1550 and 1600 nm for some times. Fundamental questions regarding the performance of the 1310 nm devices must be quantified. Standard metrics including the laser linewidth, amplitude modulation and frequency modulation responses are characterized. The intrinsic electrical parasitics of the laser diode segments and packaging are also investigated. In addition, testing fixture including a Thermal Electric Cooler (TEC) controller is for the characterization task. Measurements of these key metrics are essential to the enhancement of future devices, aiding in the optimization of more mature products.

No description available.

Motion artefacts due to cardiac and respiratory motion present a daily challenge in cardiac Magnetic Resonance Imaging (MRI), and many different motion correction procedures are used in clinical routine imaging. To reduce motion artefacts further, patients are required to hold their breath during parts of the data acquisition, which is physically straining – especially when done repetitively. Self-Gating (SG) is a method that extracts cardiac and respiratory motion information from the MRI data in the form of signals, called SG signals, and uses them to divide the data into the specific cardiac and respiratory phases it was acquired from. This method both avoids motion artefacts and allow for free-breathing acquisition. This project’s goal was to find a method for extracting cardiac and respiratory SG signals from MRI data. The data was acquired with a golden angle radial acquisition method for 3-dimensional (3D) scans. Extraction of the raw signal was tested for both raw k-space data and high temporal resolution image series, where the images were reconstructed using a sliding window reconstruction. Filters were then applied to isolate the cardiac and respiratory information, to create separate cardiac and respiratory SG signals. Thereafter trigger points marking the beginning of the cardiac and respiratory cycles were generated. The trigger points were compared against ECG and respiratory trigger points provided by the MR scanner. The conclusion was that the SG signals based on k-space data was functional on the scans from the evaluated subjects and the most effective choice of the two options, but image based SG signals may prove to be functional after further studies. / Rörelseartefakter på grund av hjärt- och respirationsrörelser är idag vardagliga utmaningar inom magnetresonanstomografi (MR) av hjärtat, och många olika metoder används för att eliminera rörelseartefakterna. Patienterna behöver dessutom hålla andan under delar av dataupptagningen, vilket är fysiskt ansträngande – speciellt när det sker upprepade gånger. Self-Gating (SG) är en metod som extraherar information hjärt- och respirationsrytm från MR-datan i form av signaler, kallade SG signaler, och använder dem för att dela in datan i de specifika hjärt- respektive respirationsfaser som var när datan upptogs. Denna metod både undviker rörelseartefakter och tillåter fri andning under dataupptagningen. Målet med det här projektet var att hitta en metod för att extrahera SG signaler för hjärt- och respirationsrytm från MR-data. Datan samlades in med en golden angle radial-upptagning för 3- dimensionella (3D) scanningar. Extraheringen av den råa signalen testades på både rå k-space data och på bildserier av 3D-bilder med hög tidsupplösning, där bilderna var rekonstruerade med en sliding window rekonstruktion. Därefter applicerades filter för att isolera hjärt- och respirationsinformationen, för att få separata SG signaler med endast hjärt- respektive respirationsrytmer. Till slut genererades triggerpunkter för att markera början av hjärt- respektive respirationscyklerna. Dessa jämfördes med triggerpunkter uppmätta med EKG och andningskudde i magnetkameran. Slutsatsen för projektet var att SG signalerna som baserades på k-space data var funktionell för de scanningar som testades och det mest effektiva alternativet, men SG signalerna som baserades på bilder kan visa sig fungera efter mer studier.

The thesis processes the auditor’s role and whether it can constrain possible earnings management in smaller Swedish private corporates. The removed auditing obligation that was abolished in Sweden 2010 with the reason to reduce the administrative burden faced by smaller corporates, contributed to an important discussion regarding the auditor’s actual importance. In addition, the corporate tax in Sweden was significantly reduced from 26.3 percent to 22 percent, which gave Swedish corporates incentives to reduce their earnings before the tax reduction, and therefore pay less taxes. This phenomenon is used in the thesis as an excellent opportunity to measure earnings management since there were significantly strong incentives for corporates to manipulate their earnings at that time. The thesis aims to increase understanding among these corporates accounting, and whether the auditor can strengthen the accounting- and audit quality, and therefore constrain earnings management. Through the use of a quantitative method where statistical tests have been performed on underlying data gathered from the corporates annual reports, the thesis research question has been answered. The formulation of the research questions is “Does the degree of earnings management differ between audited and unaudited corporates?”, which has been investigated by measuring the degree of earnings management through unexpected accruals, but also through SG&amp;A cost stickiness. Furthermore, the thesis aims to provide the research area with arguments regarding the appropriateness of the audit exemption. The result obtained in the thesis indicates that audited corporates have less negative unexpected accruals, and hence a minor degree of earnings management in comparison with unaudited corporates. However, no significance is shown in the result, at a five percent significance level, which means that it’s not possible to say with certainty that there’s a difference between these two groups in terms of negative unexpected accruals. Instead, there is evidence that there’s a significant difference between audited and unaudited corporates in terms of cost stickiness, where unaudited corporates showed more cost stickiness and thus also a higher degree of earnings management. With an additional test the thesis also demonstrates that there are corporates that don’t follow the Swedish laws regarding audit exemption. This is when it’s discovered that there are corporates that aren’t covered by the audit exemption, and thus don’t meet the required limits, but still don’t provide an auditor. These corporates also prove to have a higher degree of earnings management since the thesis received a significant result in terms of negative unexpected accruals. To sum up, the thesis highlights that the auditor’s role is of great importance in several aspects, and for this reason there are motives for legislators to review the audit exemption in Sweden.