Miracle-dz/UniFAR-FTUs huggingface dataset:
Vortex-Based Aero- and Hydrodynamic Estimation

Author(s): Hemati, Maziar Sam | Advisor(s): Eldredge, Jeff D; Speyer, Jason L | Abstract: Flow control strategies often require knowledge of unmeasurable quantities, thus presenting a need to reconstruct flow states from measurable ones. In this thesis, the modeling, simulation, and estimator design aspects of flow reconstruction are considered. First, a vortex-based aero- and hydrodynamic estimation paradigm is developed to design a wake sensing algorithm for aircraft formation flight missions. The method assimilates wing distributed pressure measurements with a vortex-based wake model to better predict the state of the flow. The study compares Kalman-type algorithms with particle filtering algorithms, demonstrating that the vortex nonlinearities require particle filters to yield adequate performance. Furthermore, the observability structure of the wake is shown to have a negative impact on filter performance regardless of the algorithm applied. It is demonstrated that relative motions can alleviate the filter divergence issues associated with this observability structure.In addition to estimator development, the dissertation addresses the need for an efficient unsteady multi-body aerodynamics testbed for estimator and controller validation studies. A pure vortex particle implementation of a vortex panel-particle method is developed to satisfy this need. The numerical method is demonstrated on the impulsive startup of a flat plate as well as the impulsive startup of a multi-wing formation. It is clear, from these validation studies, that the method is able to accommodate the unsteady wake effects that arise in formation flight missions.Lastly, successful vortex-based estimation is highly dependent on the reliability of the low-order vortex model used in representing the flow of interest. The present treatise establishes a systematic framework for vortex model improvement, grounded in optimal control theory and the calculus of variations. By minimizing model predicted errors with respect to empirical data, the shortcomings of the baseline vortex model can be revealed and reconciled. Here, the method is demonstrated on an impulse matching model for canonical unsteady wing maneuvers and reveals the shortcomings of the Kutta condition in such flows. The resulting analysis sheds light on the governing physical processes and provides guidance for model improvement for the unsteady aerodynamics associated with these canonical wing maneuvers.
Coal-gasification systems: a guide to status, applications, and economics. Final report

Coal gasification has been the subject of a great deal of study and development worldwide over the past decade. The open literature currently contains bewildering and often inconsistent information concerning the development status and economic viability of coal gasification systems. The Advanced Power Systems Division of EPRI has devoted considerable resources to the development and demonstration of coal gasification technology for ultimate use in electric-power-generation systems. The primary objective of this Guide is to provide current and consistent information concerning the status of commercial development, potential utility applications and EPRI-developed capital and operating costs for coal-gasification technologies that have already been demonstrated at commercial scale as well as for those that are close to commercial practice. Current commercial/developmental status of Lurgi, Koppers-Totzek, Texaco, Shell, British Gas Corporation/Lurgi, KILnGAS, Westinghouse and High Temperature Winkler is discussed. Environmental aspects, thermal performance, reliabiilty and cost information are provided for medium-Btu gas production; retrofitting and repowering existing steam plants; integrated gasification combined cycle (IGCC) systems; low-water-consumption IGCC systems; methanol from coal; once-through methanol production in an IGCC system; and IGCC systems employing advanced, molten-carbonate fuel cells. Finally, for comparison purposes, performance and cost estimates on a consistent basis are provided for coal-fired steam plants;more » oil-fired steam plants; oil- and gas-fired combined-cycle and combustion-turbine plants. 88 figures, 86 tables. « less
Design with intent : a design pattern toolkit for environmental and social behaviour change

This thesis describes a systematic research enquiry into in uencing more sustainable behaviour through design, which has produced communicable new knowledge in the form of a design pattern toolkit, called Design with Intent, developed and evaluated through an action research process. The toolkit aims to help designers create products, services and environments which in uence the way people use them, primarily for environmental and social bene t; it brings together techniques for understanding and changing human behaviour from a range of psychological and technical disciplines, illustrated with examples, with the aim of enabling designers to explore and apply relevant strategies to problems. `Design for behaviour change' has grown signi cantly as a eld in the past few years, to a large extent due to recognition of the contributions that user behaviour makes to the environmental and social impact of technology and designed systems in general. People's behaviour is inevitably in uenced by the design of the systems which they use, and it is not a great leap to consider that design could be used intentionally to in uence behaviour where some bene t would result. This thesis starts by identifying the need for a guide for designers working on behaviour change. It extracts insights from reviews of perspectives on in uencing behaviour from di erent disciplines, inside and outside of `design', which could be usefully applied in a design context. Through an action research process of iterative development and workshops with design practitioners and students, these insights are incorporated into a toolkit for designers, which is applied mainly to environmental and social behaviour change briefs. Versions of the toolkit are made publicly available, and feedback from early users in di erent contexts is analysed and implications for continuing development discussed.
Overcoming Information Overload in the Cockpit

Abstract : This study is focused on finding new technologies that will convey the most important information to pilots, when they need it, and in a more efficient and effective way than is currently being done across Army Aviation. The ever increasing complex nature of flying and managing an aircraft, especially during an event which degrades pilot awareness, demands a constant search for better ways of portraying aircraft data to the crew members. The objectives of this study were to determine a hierarchy of information requirements for pilots at different times throughout the course of a mission, research better ways to relay that information to pilots by finding new intuitive display technologies, tactile technologies, and alternate heads-up-display symbology layouts, and finally, to determine, through the use of a non-human-in-the-loop discrete event simulation, if these new technologies have a significant impact on increasing pilot situational awareness while at the same time reducing both overall and individual resource (visual, cognitive, auditory, fine motor, and speech) workload on the crew.
Evaluation of guided wave propagation in steel pipes

In this study, an active structural health monitoring (SHM) system is developed for non-destructive defect identification in steel pipes, which is based on guided waves generated and collected using piezoelectric ceramics patches. Finite element models of the elastic wave propagation in steel pipes are devised to determine their characteristics and used to optimise wave mode and frequency. An experimental study is also conducted for the validation of the proposed structural health monitoring system and the numerical modelling. The obtained results can be employed to optimally design the online structural health monitoring system with an integrated piezoelectric actuator-sensor network for steel pipes.
New Σ-Δ voltage to frequency converter

Voltage to frequency converter (VFC) is an oscillator whose frequency is linearly proportional to control voltage. There are two common VFC architectures: the current steering multivibrator and the charge-balance VFC. For higher linearity, the charge-balancing method is preferred. The charge balanced VFC may be made in asynchronous or synchronous (clocked) forms. The synchronous charge balanced VFC or 'lsigma delta" (LA) VFC is used when output pulses are synchronized to a clock. The charge balance VFC is more complex, more demanding in its supply voltage and current requirements, and more accurate. It is capable of 16 to18 bit linearity. In this paper, the new SVFC (NSVFC) is described. This NSVFC works similarly as conventional SVFC but it has a pure tone on output (for constant input voltage). Therefore, it is possible to measure the period of NSVFC output (this does not work for SVFC).
Cakrawala Pelayanan Publik di Negara Dunia ke Tiga

Membangun kepercayaan masyarakat atas pelayanan publik yang dilakukan penyelenggara pelayanan publik merupakan kegiatan yang harus dilaksanakan seiring dengan harapan dan tuntutan seluruh warga negara dan penduduk Indonesia tentang peningkatan pelayanan publik yang selalu menjadi perhatian umum.
The use of artificial insemination in dairy farms in urban/peri-urban Kampala, Uganda

Uganda is one country with fastest growing populations in the world and with more than 25% of the population living in poverty. There is a rapid rural urban migration with increasing demands for food for low income earners especially in these areas. One way to mitigate food insecurity is to increase milk and meat production efficiency, and thus reproductive performance of cows is crucial for good production. A well-documented strategy for improving dairy cow productivity through faster genetic improvement is to breed dairy cows using proven semen via artificial insemination (AI). AI has been used in Uganda for over 60 years but only less than 10 %, a small population of the country’s herd has been bred that way. The aims were to study knowledge, attitude and practices factors influencing cow fertility results on dairy farms around Kampala using AI and to propose ways of promoting increased use of AI in Uganda. The study was conducted in urban and peri-urban areas of Kampala, Uganda. Data was collected through interviews of farmers breeding cows using AI (n=10) or natural mating (n=10); AI technicians (n=10) and semen vendor units (n=3). The results indicated many reasons limiting the use of AI. The outstanding reason for not using AI was said to be the poor pregnancy result from AI. Poor herd management and heat detection on farms as well as incorrect handling of semen by AI technicians indicated how knowledge gaps and improper practices jeopardize the outcome of AI and thereby also the extent of the use of AI. Furthermore, poor administration of AI activity at national level such as lack of central records database and reporting format as well as lack of breeding regulation authority to register and manage technicians were evident shortfalls. In order to improve AI-services in Uganda and mitigate reproductive failures from AI, the study proposes further farmer education and sensitization, refresher courses for AI technicians, identification and promotion of cattle breeds better adapted for conditions prevailing in Uganda in addition to operationalizing herd recording would be necessary to guarantee quality of insemination service delivery by authorized and registered AI technicians and semen vendor units.
Diabetes und Diät: Viel geforscht – wenig geklärt

Die Inzidenz des Diabetes mellitus wird weiterhin ansteigen. Schon jetzt leben weltweit 425 Millionen Erwachsene mit Diabetes mellitus (zu 90 % vom Typ 2) und verursachten 2017 Kosten von 652 Milliarden Euro. Da neben Erbfaktoren der Lebensstil ursächlich für diese Krankheit ist, könnten entsprechende Änderungen das Risiko und Fortschreiten des Diabetes reduzieren. Vorhandene Daten zum Einfluss von Diätfaktoren wurden in diesem Review ausgewertet.
BENEFITS OF USING AUTHENTIC MATERIALS IN AN EST CLASS

There are many references to authentic material in the EST literature containing thorough explanations of why it should or should not be included in lessons and how it is best exploited. And all these authors who support the use of authentic material share the idea of the benefit students get from being exposed to the language in authentic materials. We intend to highlight different ways of selecting appropriate and content rich material for an EST course.
Asset Tracking Using a Real-Time Locating System Employing a Novel Location Determination Method

Real-Time Locating Systems (RTLS) belong to a class of locating systems capable of remotely determining the location of tagged assets in an environment within a relatively short time frame (real-time). Signals from tags are received wirelessly by readers, which use information about the signal, to continuously determine the location of the tag relative to each reader. Using readers positioned at several locations around a tag offers multiple location readings, which can be compiled together at a central host to estimate the location of a tag in a two or three dimensional space. Location information from several vantage points also reduces the chance of false location estimates of a tag when one or more readers' location estimates contain some error.Indoor asset tracking is a unique specialty of many types of RTLS, as Global Positioning Systems (GPS) have difficulty providing asset locations within buildings. RTLS deployments generally address the problems of determining the location of equipment and products in a warehouse or even tracking employees and files in an office. The most common RTLS uses a Wi-Fi infrastructure to determine the location of tagged assets. These systems employ Time-of-Arrival (ToA) or Received Signal Strength Indication (RSSI) techniques to wirelessly determine asset location. Scaling up a system that uses a Wi-Fi infrastructure to localize large numbers of tags introduces a significant wireless traffic burden, reducing data throughput for other users of the same Wi-Fi network. Both ToA and RSSI methods of localization suffer from significant inaccuracies in reported location of assets and often are unable to determine which room an asset resides.This thesis presents a new method for determining asset location that offers better accuracy than systems using ToA and RSSI techniques, and an RTLS that uses existing Wi-Fi infrastructures and commercial off-the-shelf parts (COTS) without placing excessive need on the Wi-Fi networks.
Experimental and theoretical stability analysis of complex-coupled DFB laser diodes with and without external feedback

These Ecole polytechnique federale de Lausanne EPFL, n° 1475 (1996) Reference doi:10.5075/epfl-thesis-1475Print copy in library catalog Record created on 2005-03-16, modified on 2016-08-08
Lobes de stabilité en UGV approche expérimentale en usinage de poches

La theorie des lobes de stabilite en UGV est aujourd'hui maitrisee pour des usinages suivant des trajectoires rectilignes et a engagement radial constant. Pour des trajets contenant des arcs de cercles, le diagramme des lobes de stabilite en trajectoire rectiligne n'est plus applicable directement. L'etude experimentale qui suit propose differentes options et reglages permettant d'utiliser les lobes de stabilite en usinage rectiligne dans le cadre de l'usinage de poches. Les options de programmation de la commande numerique, la consigne de vitesse d'avance et l'engagement radial sont plus particulierement etudies et optimises pour obtenir des conditions les plus stables possibles.
8T SRAM Defective Cell with Open Defects

The defective behaviour of an 8T SRAM cell with open defects is analyzed. Full and resistive open defects have been considered in the electrical characterization of the defective cell. Due to the similarity between the classical 6T SRAM cell and the 8T cell, only defects affecting the read port transistors have been considered. In the work, it is shown how an open in a defective cell may influence the correct operation of a victim cell sharing the same read circuitry. Also, it is shown that the sequence of bits written on the defective cell prior to a read action can mask the presence of the defect. Different orders of critical resistance have been found depending on the location of the open defect. A 45nm technology has been used for the illustrative example presented in the work
Hoe verwerven studentleraren competenties die leiden tot ICT-gebruik in de klas: Een exploratieve casestudy in drie Vlaamse lerarenopleidingen

Effective ICT integration for pre-service teachers is an important challenge for teacher training institutions. They need to help pre-service teachers understand how to integrate ICT in meaningful ways in the classroom. The general aim of this study was to explore the ways in which ICT is acquired by student teachers in order to prepare them to integrate ICT in classroom practice. Specifically, a case study was conducted in three teacher education institutions in Flanders to examine ICT integration through the lens of pre-service teachers, teacher educators, ICT coordinators and the heads of the department. The results indicate that the three institutions are in transition: they are moving from ICT as a separate ‘stand-alone’ course towards a more integrated approach of imbedding ICT within the courses. The discussion will focus on the challenges and opportunities inherent in understanding how to prepare student teachers in the field of educational ICT-use.
Solution of second order non-linear boundary value problems by the boundary element method

In this work, the mathematical foundation of a numerical technique for the solu­ tion of second order non-linear boundary value problems in two variables is presented. In this technique, all the non-linear terms are collected as the forcing term of a Pois­ son type equation. This forcing term may include the unknown and its derivatives. By utilizing Green's divergence theorem and the fundamental solution of the Laplace operator, this Poisson type equation is converted into an integral equation which con­ tains integrals over the boundary and the domain. The boundary is partitioned into straight elements and the domain is partitioned into triangular elements. Collocation at the boundary and the domain nodes results in a set of non-linear algebraic equa­ tions which contain the nodal values of the boundary unknowns and the nodal values of the forcing term. These equations are solved by employing an iterative NewtonRaphson scheme. The accuracy of the solution obtained by the Newton-Raphson scheme is monitored by examining two error norms. The use of these error norms in a grid optimization procedure is demonstrated in Paper II of this dissertation.
Fault-tolerant communication for distributed embedded systems

Fault-tolerant communication is a crucial point in building distributed safetycritical real-time systems, as they are used today e.g. in the automotive and avionics domain. To argue about the timing properties of a distributed system and to show the fault-tolerance of its communication, a predictable timing of the system is needed. This can be solved using the time-triggered paradigm. In accordance with this paradigm, a time-triggered communication protocol, FlexRay, and an operating system OSEKtime with corresponding communication layer FTCom for the fault-tolerant communication were introduced by the FlexRay Consortium and OSEK/VDX respectively. In this chapter we present the formal specifications of FlexRay and FTCom that allow us not only to argue about their properties in a precise, formal manner and to infer the dependences between their properties, but also to prove the correctness of the implementation formally.
Predictive control of a multi-component distillation column based on neural networks

A predictive scheme to control the top-product and bottom-product compositions of a three component distillation column is presented. A nonlinear model of the process for prediction of future outputs is implemented using a feed forward neural network (FNN). Operation of the column under different perturbations is analyzed using several alternatives of the neural-predictive-control strategy designed. The system behavior is compared with that of a PI controlled plant.
Evolutionary Computation and Parametric Pattern Generation for Airport Terminal Design

It is without doubt that airport terminals are some of the most com- plex building types in existence. Their scale, the nature of their func- tions, the strict security measures as well as the function-specific components and building equipment that is present in such build- ings are all factors that increase their level of complexity as a build- ing type. In a real design situation, dealing with the variety of design param- eters that the design of an airport terminal incorporates can be a dif- ficult task to manage and may sometimes become an impediment to the design process. Furthermore, solely because of the enormous amount of possible design solutions that exists even for a relatively small set of design parameters1, the discovery of optimal or near optimal solutions through a traditional design approach is not guar- anteed to happen. Given these assumptions, it has been proposed within the con- text of this project that the design of layouts for airport terminals be addressed by the use of computation-based design methods, specifically Parametric Modelling in combination with evolutionary algorithms, The combination of parametric modelling and evolutionary algorithms has been used consecutively in two scales: First in order to search for optimality regarding the layout of the terminal, and with regard to multiple design goals (accessibility, cost, sustainability, re- tail performance). A Multi Objective Evolutionary Algorithm (MOEA) is used to produce a series of Pareto Optimal solutions, out of which one is selected. Second, a parametric envelope system is applied to the selected layout, and it’s defining parameters are once again optimized, this time with regard to view, sunshading and material usage. Within the context of the project a case study has been performed which focuses on the design of a new terminal at the new Inter- national Airport site in Doha, Qatar. The flexibility of the proposed method allowed for the incorporation of site-specific evaluation cri- teria into the parametric model, allowing for an optimal site-specific solution to be generated, both in terms of layout and of building envelope.
Clinical Analysis of Suction Drainage in Cementless Hip Replacement: A Prospective Randomised Study

Background: Several studies have suggested that the use of drains did not improve surgical outcomes after hip replacement. There is still a lack of strict recommendations for drainage use.Methods: Prospective, randomised study was performed. The analysis included 100 patients. Inclusion criteria: idiopathic hip osteoarthritis. Exclusion criteria: secondary coxarthrosis, autoimmune disease, coagulopathy, venous/arterial thrombosis, hepatic/renal insufficiency, cement, or hybrid endoprostheses. Results: We found smaller haematomas in the no-drainage group (9.76 mm vs. 10.33 mm, p = 0.653). The visual analogue scale score was lower in the no-drainage group (5 vs. 6). Less bloodloss in the no-drainage group (1,124 ml vs 1,224 ml, p = 0.59). Two patients had a deep joint infection in the no-drainage group, none in the drainage group.Conclusion: It is noteworthy that two cases of early infections were observed in the no-drainage group, whereas there were no such complications in the drainage group. Further research is warranted to validate our findings.Trial registration: The study was successfully retrospectively registered in Clinicaltrial.gov with identification number: NCT04333264 (03/04/2020). https://clinicaltrials.gov/ct2/show/NCT04333264? term=NCT04333264&draw=2&rank=1