A flight data acquisition system was developed to aid unmanned vehicle designers in verifying the vehicle's design performance. The system is reconfigurable and allows the designer to choose the correct combination of complexity, risk, and cost for a given flight test. The designer can also reconfigure the system to meet packaging and integration requirements. System functionality, repeatbility, and accuracy was validated by collecting data during multiple flights of a radio-controlled aircraft. Future work includes sensor fusion, thrust prediction methods, stability and control derivative estimation, and growing Cal Poly's small-scale component aerodynamic database.

Vad ska man ha på sig på jobbet? Frågan kan vara en källa till både undran och nervositet för nya bildpedagoger på väg ut i arbetlivet. Klädval och utstyrsel är både pregnanta symboliska uttrycksmedel och innebär antingen praktiska möjligheter eller svårigheter i en bildpedagogs yrkesutövande. Trots detta verkar frågan om lämpliga kläder inte ha en självklar plats under bildlärarutbildningen och kan rentav framstå som besvärlig eller underlig om den dyker upp. Mitt examensarbete behandlar följande frågor: ”Vilka normer och förväntningar har bildpedagogerna på sin egen och sina kollegors klädsel?” samt ”Hur upplever och beskriver bildpedagogerna att de iscensätter sig själva som yrkespersoner genom kläder?”Jag har valt att närma mig frågan om vilka kläder som hänger ihop med bildpedagogiskt yrkesutövande genom att fråga utövarna själva. Mitt arbete är inte så mycket en undersökning av vilka kläder bildpedagoger faktiskt använder. Snarare handlar det om varför de väljer att klä sig som de gör och vilka föreställningar om den egna yrkesrollen deras klädval speglar. Till hjälp för min analys och tolkning har jag tagit avstamp i den kanadensisk-amerikanske sociologen Erving Goffmans teoretiska inramning av det sociala livets teater. Som ett komplement till Goffmans teatermetaforer har jag hämtat analytisk inspiration från dragshow-världens scentraditioner. Ordet realness som används i titeln för denna uppsats är hämtat från dragkulturens vokabulär och betyder enkelt förklarat att spela en roll på ett övertygande vis.Utöver uppsatsen har arbetet utmynnat i en konstnärlig gestaltning i form av kläder och en video inspirerade av min empiri. Videon är en parafras på det kända tv-formatet RuPaul’s Drag Race (som har populariserat och/eller exploaterat dragshowkulturen beroende på vem du frågar). Det hela visades i en rumslig installation på Konstfacks vårutställning 2021.Undersökningen tyder på att bildpedagogerna inte klär sig efter en gemensam klädkod men att de förhåller sig till vissa gemensamma normer och förväntningar. Jag har också funnit att det finns vissa praktiska och symboliska attribut de kan använda sig av som ett slags ”scenkostym” för att övertyga i sin roll som bildpedagog.

The study aims to investigate oral-language features in writing by students at a highschool level. It also aims to examine the use of speech-language between the universitypreparatory and vocational programs. Methods such as questionnaires and text analysiswere used to answer the research questions. The results show that all the study'scategorized speech-language features occur in students' writing, and of the selectedfeatures within the categorizations, the occurrence varies. When speech-languageappeared, it occurred frequently. The prevalence of speech-language features is higherwithin vocational preparation than in university preparation programs. According toteachers, spoken language occurs in students' writing, it can vary between occurrence,speech-language features, and program orientation. In summary, spoken language is afrequent occurrence in students' writing and it occurs more often in vocational preparationprograms than in university preparation.

The word hysteresis is derived from a Greek word meaning "to lag 'behind". As specifically applied to fluid flow around bodies with transient angles of attack in and near the stall region, "aerodynamic hysteresis" is used to describe the effect of delay in boundary layer separation and reattachment upon the lift, drag and pitching moment. Experimental work done on airfoils by H. Studer showed that for increasing angles of attack flow "separation is delayed to an angle of attack appreciably greater than that for a stationary airfoil. On the return movement, re-establishment of a smooth flow is also delayed." [1]* The result is that under transient conditions "more than one value of flow coefficient (and thus lift, drag and pitching moment) can be obtained for a single angle of attack. . ., depending upon the direction in which the particular angle of attack is approached." [2]

This essay follows closely the process of making the work for my degree project. The aim of the text is to reflect as much as possible the entire journey of my thinking and doing, demonstrating how one of the main concepts of the work, metamorphosis, served the final purpose of the project, to build a world for bizarre creatures made of colorful piles of clothes. The methods used were looking for inspiration material online i.e. a performance by Ingri Fiksdal, several drag performers, or a music video by the band Primus, bringing in Posthuman theory and decolonial thinking as well as readings on the grotesque, including writers like Rosi Braidotti, María Lugones, and Sara Cohen Shabot respectively, taking an excessive amount of notes on diary form, and playing dress-up in the studio. The information that surfaced while all the above was combined, is presented in quite a raw form here, not as one smooth text, but as chunks that mirror where my process was at each moment. More so than anything else, this essay demonstrates the messiness of a/my artistic process and acts as a mind map of interests as they get closer to some kind of crystallization. / <p>This master work includes both a performing and a written part.</p>

Tidigare forskning, elevresultat och rapporter visar att elever i både äldre och yngre åldrar uppvisar svårigheter inom räknesättet subtraktion samtidigt som undervisningen är läromedelsstyrd. Studiens syfte är att genom en läromedelsanalys granska tre olika matematikläromedel från tre olika förlag för årskurs 3. Detta med hjälp av variationsteorin som teoretisk utgångspunkt och tidigare forskning. Genom variationsteorin granskas hur dessa läromedel framställer räknesättet subtraktion genom att undersöka förutbestämda kritiska aspekter och drag samt hur variationsmönster framträder. Studiens frågeställningar är: Vilka möjliga kritiska aspekter och drag samt variationsmönster kan urskiljas i utvalda matematikläromedlen inom subtraktion? Hur kan dessa påverka lärandet i subtraktion? Resultatet visar att de kritiska aspekterna kan urskiljas i alla läromedel men i olika utsträckning samt att ett av de kritiska dragen inte förekommer i samtliga läromedel. Även variationsmönstrens urskiljning varierar mellan de olika läromedelsböckerna. Två variationsmönster förekommer i alla läroböcker medan två inte gör detta. Eftersom variationsmönstren skapar olika sorters medvetenhet kring lärandeobjektet och gör subtraktions kritiska aspekter och drag synliga för eleven, behöver brist på variationsmönster kompletteras i övrig matematikundervisning. Detta för att gynna elevernas lärande och förståelse för subtraktion och subtraktionsstrategier och på så vis undvika felberäkningar.

Thesis (MEng (Mechanical Engineering))--Cape Peninsula University of Technology, 2019 / The accumulating space debris has been a developing problem for many years. Technological advances led to the creation of nanosatellites, which allows more affordable access to space. As a result, the number of satellite launches is rapidly increasing, which, translates into an increase in debris in the low earth orbit (LEO) and geostationary orbit (GEO). To comply with the Inter-Agency Space Debris Coordination Committee (IADC) requirement of a 25-year maximum orbital lifetime, nanosatellites must have an end of life strategy. Failure to meet these guidelines may not only cause catastrophic collisions but may make future space travel even more challenging. Consequently, orbital lifetime predictions must be completed for nanosatellites. Considering this, the aim of this thesis is to investigate the orbital lifetime predictions for the nanosatellite ZACube-2, and the effects on the orbital lifetime if ZACube-2 is fitted with deorbiting technology, specifically a drag argumentation device. An in-depth literature review regarding the current state of technology pertaining to nanosatellite de-orbiting was conducted. This was followed by studies regarding orbital dynamics and perturbation forces. Four case studies were simulated in NASA’s Debris assessment software (DAS 2.0) using orbital parameters extracted from the two-line element (TLE) file. General information such as launch date and final mass was provided by F’SATI. The Baseline case study presented the orbital lifetime of ZACube-2, without any drag enhancement device. This was followed by case study 1,2 and 3 which represented ZACube-2 when fitted with three different drag enhancement devices. A comparison study indicated a reduction in all three cases. A new inflatable cube de-orbiting device (ICDD) concept was also presented, and the effects it has on the orbital lifetime predictions are showcased in case study three. Two deployment concepts were considered and evaluated against design requirements. Solidworks software was used to model the most suitable concept as well as perform finite element analysis on the structure. Static analysis was followed by natural frequency analysis in which the natural frequencies of the components and assembled structure were extracted. The Soyuz launch vehicle’s sinusoidal testing requirements were used to evaluate the structures survivability under dynamic loading. Based on the finite element , and harmonic analysis it was concluded that the structures will survive the launch conditions of the Soyuz launch vehicle. Furthermore, individual parameters affecting orbital lifetime predictions are also identified, in the form of a mass and cross-sectional sensitivity study and a ballistic coefficient versus orbital time study.

京都大学 / 新制・課程博士 / 博士(工学) / 甲第23489号 / 工博第4901号 / 新制||工||1766(附属図書館) / 京都大学大学院工学研究科都市社会工学専攻 / (主査)教授 岸田 潔, 教授 木村 亮, 准教授 音田 慎一郎 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM

This thesis models and analyzes an in-situ method for measuring the density of the thermosphere at low Earth orbit (LEO) altitudes in real time. As satellites orbit in the thermosphere, the sparse yet present air perturbs their orbits via the drag force. The drag force is poorly characterized and has a significant effect at LEO altitudes relative to other forces, making this perturbation force one of the greatest uncertainties in LEO orbit propagation. A steadily increasing number of satellites orbit at LEO altitudes, so for safety, it is critical to accurately track these satellites to avoid collisions. Therefore, better knowledge of the drag force is required. The drag force depends directly on the air mass density in the thermosphere, and current knowledge of the thermospheric density is limited. Models exist to describe the variations in density over time, but due to the many unpredictable factors which affect the thermosphere, the best of these models are only accurate to within 10%. Also, currently available techniques to measure the thermospheric density can only return time-averaged measurements, which causes inaccuracies in orbit propagation due to local density variations. Some planned in-situ density measurement missions rely on measuring acceleration caused by the drag force, but this requires a highly accurate accelerometer to be able to separate the drag force from other stronger forces acting on a satellite. The Satellite Producing Aerodynamic Torque to Understand LEO Atmosphere (SPATULA) concept was introduced as an alternative method, which infers density based on measurements of the drag torque. In the rotational regime, drag produces the strongest torque at LEO altitudes by far, making it possible to acquire accurate density measurements with inexpensive, commercially available sensors and actuators on a SPATULA spacecraft. This thesis expands upon a preliminary study of the SPATULA concept. A SPATULA spacecraft's dynamics are modeled in three dimensions, and a novel method is introduced for modeling the dependence of external torques on the geometry and attitude of the spacecraft. In addition to the dynamics model, discrete-time algorithms for guidance, system state filtering, attitude control, and density estimation are developed for the six degrees of freedom case. The MathWorks tools MATLAB and Simulink are used to simulate the physics and system models. The simulations are used to evaluate the performance of the SPATULA system's density measurements and compare them to conventional methods. It is found that the accuracy and bandwidth of the SPATULA system have a significant dependence on the assumed accuracy of the torque models in the system's filter. When the bandwidth is set to avoid significant phase shift errors, the SPATULA system can produce real-time measurements of density accurate over a minimum time scale of about 60 seconds, and the density error has a standard deviation of about 2 x 10^-14 kg/m^3. This accuracy is about 6 times better than the best thermospheric models, and it is also better than reported accuracies of most other density measurement methods. If bandwidth is sacrificed, the density error standard deviation can be decreased by a factor of 4. This introduces additional error due to phase shift delays, but these can be corrected with signal processing techniques. With the higher accuracy, the SPATULA system loses its real-time ability, but the data it produces would still provide excellent insight for improving thermospheric models. With high accuracy and low cost, the SPATULA concept is a promising path to pursue toward improving thermospheric density knowledge. / Master of Science / This thesis models and analyzes a method for measuring the density of the upper atmosphere in real time directly onboard a satellite. As low Earth orbit (LEO) satellites orbit at low altitudes, the sparse yet present atmosphere changes their orbits via the drag force. The drag force is poorly characterized and has a significant effect at LEO altitudes relative to other forces, making this perturbation force one of the greatest uncertainties in LEO orbit prediction. A steadily increasing number of satellites orbit at LEO altitudes, so for safety, it is critical to accurately track and predict the orbits of these satellites to avoid collisions. Therefore, better knowledge of the drag force is required. The drag force depends directly on air density, and current knowledge of the upper atmospheric density is limited. Models exist to describe the variations in density over time, but due to the many unpredictable factors which affect the atmosphere, the best of these models are only accurate to within 10%. Also, currently available techniques to measure the upper atmospheric density can only return time-averaged measurements, which causes inaccuracies in orbit prediction due to local density variations. Some planned density measurement missions rely on measuring acceleration caused by the drag force, but this requires a highly accurate accelerometer to be able to separate the drag force from other stronger forces acting on a satellite. The Satellite Producing Aerodynamic Torque to Understand LEO Atmosphere (SPATULA) concept was introduced as an alternative method, which infers density based on measurements of the drag torque. Drag produces the strongest torque at LEO altitudes by far, making it possible to acquire accurate density measurements with inexpensive, commercially available parts on a SPATULA spacecraft. This thesis expands upon a preliminary study of the SPATULA concept. A SPATULA spacecraft's motion and rotation is modeled in three dimensions, and a novel method is introduced for modeling the dependence of external torques on the geometry and orientation of the spacecraft. In addition to the dynamics model, algorithms that could be implemented on a satellite's computer are developed for determining the best orientation, estimating the state of the system, controlling the orientation, and estimating density. The MathWorks tools MATLAB and Simulink are used to simulate the physics and system models. The simulations are used to evaluate the performance of the SPATULA system's density measurements and compare them to conventional methods. It is found that the accuracy and bandwidth of the SPATULA system have a significant dependence on the assumed accuracy of the torque models used by the system. When a high bandwidth is used to avoid problems associated with low bandwidth, the SPATULA system can produce real-time measurements of density accurate over a minimum time scale of about 60 seconds, and the density error has a standard deviation of about 2 x 10^-14 kg/m^2. This accuracy is about 6 times better than the best upper atmospheric models, and it is also better than reported accuracies of most other density measurement methods. If bandwidth is sacrificed, the density error standard deviation can be decreased by a factor of 4. This introduces additional error due to delayed measurements of quickly varying components of the density, but these can be corrected with signal processing techniques. With the higher accuracy, the SPATULA system loses its real-time ability, but the data it produces would still provide excellent insight for improving atmospheric density models. With high accuracy and low cost, the SPATULA concept is a promising path to pursue toward improving density knowledge.

This diploma thesis of the self-presentation explores the aspects of self-presentation and social perception of a group of 5 selected drag queens. The thesis has a form of 5 case studies based on deep analysis of their profiles on Facebook, Instagram and TikTok, which are currently the most used social networks. The areas of interest in this diploma thesis were the visual presentation of their drag identity, the trends their profiles show in areas of make-up, wig or hair, costume and body position in which they are shown on their profiles. The second area of interest was the nature of the textual presentation and captions, use of hashtags and interaction with their audience. Third are of interest was the audience itself, whether it was supportive in terms of drag and LGBTQ+ community in general and the nature of the interaction with the audience. The results from the content analysis were then summarized and used as a basis for semi-structured interview based on the outcomes from the said content analysis. The focus of this thesis was the relation of their drag identity to their civil identity and how these identities interact on their profiles on social medial. The thesis claims that the shift of drag from club shows to everyday presence on social media positively affects the reception of this...