A new invention has been developed by CorPower Ocean; a mechanical rack and pinion solution called a cascade gearbox. The primary function of the gearbox is transforming a linear motion into a rotational motion. The novelty is its unique properties; it is capable of combining heavy loads and high velocities, and at a high efficiency. CorPower Ocean is aiming at finding applications where the gearbox’s unique properties can be of use. If the gearbox is combined with a motor it forms an electromechanical actuator. Therefore, an investigation of applications using actuators has been targeted. More specifically, the master thesis assignment was to examine in which applications the transition of a cascade electromechanical actuator was technically viable. Research questions that derived was to answer if an implementation of an cascade electromechanical cylinder is technically feasible and if it implicates improved results regarding environmental related goals. The methodology executed to finalize the project included several stages. The first stage was the background study which consisted of reviewing trends and gathering technical data for case studies of targeted applications. The targeted applications were heavy lifting equipment and injection molding machines. With the help of CorPower software, gearbox dimensioning examples were drafted and could be evaluated from a size and weight perspective. To further evaluate potential applications, interviews were conducted with targeted equipment manufacturers. The selection of applications was completed by evaluating the interview responses and the drafted gearbox examples. Chosen applications were ultimately a nine tonnes forklift and an empty container handler, mainly due to good customer response, integration ability and potential of performance enhancement. An optimisation was performed to achieve a concept solution that satisfied customer needs such as low cost and a slim design. In order review the business cases in each application, energy savings and performance cases were conducted, benchmarking against the hydraulic solution. In the ECH case, the energy saved was 54% and the productivity increased with 9.6%. In the forklift case, the energy saved was 52% and the productivity increased with 1%. Both of applications have great potential of a transition from hydraulic cylinders to electromechanical cylinders in terms of implementation and technical feasibility. The final concept solutions exceeded the hydraulics in performance, retaining a slim and acceptable size and design. Furthermore, this sector of heavy lifting equipment had high potential for electrification which can contribute to reduced emissions and fuel savings. Keywords: electromechanical cylinders, concept development, cascade gearbox / En ny innovation har utvecklats av CorPower Ocean; en mekanisk rack och pinjonglösning kallad kaskadväxel. Dess primära funktion är att transformera en linjär rörelse till en roterande rörelse och vice versa. Nyhetsvärdet är växellådans unika prestanda; den kan hantera kombinationen av höga laster och höga hastigheter till en hög verkningsgrad. Nu önskar CorPower Ocean att hitta applikationer där kaskadväxelns unika prestanda kommer till användning. Om kaskadväxeln kombineras med en motor bildas en elektromekanisk aktuator, och därför har en utredning av applikationer som använder aktuatorer utsetts som en marknad att undersöka närmare. Mer specifikt var examensuppdraget att undersöka i vilka applikationer en sådan övergång skulle vara genomförbar ur ett tekniskt perspektiv. Forskningsfrågor som önskades besvaras var huruvida en sådan övergång är genomförbar ur ett tekniskt perspektiv och om en sådan implementation innebär förbättringar vad gäller miljörelaterade mål. Metodologin som användes för att slutföra projektet utgjordes av flera steg. Första steget var att genomföra en bakgrundsstudie om elektrifiering och produkttrender samt samla teknisk data på utsedda applikationer. De utsedda övergångsområdena var maskiner för tunga lyft samt plastformssprutningsmaskiner. Med CorPowers mjukvara kunde dimensioneringsexempel göras för kaskadväxellådor och utvärderas utifrån sin storlek och vikt. För en fortsatt utvärdering av applikationer genomfördes intervjuer med tillverkare av de utsedda applikationerna. Val av applikationer slutfördes genom att utvärdera svar från målkunder samt dimensioneringsexempel av växellådorna. De valda applikationerna blev slutligen en nio tons gaffeltruck och en tomcontainertruck. Valet baserades huvudsakligen på bra respons från kunder, bra integrationsmöjligheter samt potentiella prestandaförbättringar. Fokus låg på att byta ut lyftcylindrarna och bortse från övriga mindre cylindrar. Lösningarna optimerades för att matcha kundkrav så som kostnad och passform. Ett energibesparingscase utfördes för att jämföra kaskadlösningen med nuvarande hydrauliska lösning. I tomcontainertruckens fall sänktes energiförbrukningen med 54 % och produktiviteten ökade med 9.6%. I gaffeltruckens fall sjönk energiförbrukningen med 52 % och produktiviteten ökade med 1 %. Båda applikationerna uppvisade stor potential för ett byte från hydraulcylindrar till elektromekaniska cylindrar. De slutgiltiga koncepten överträffade hydraulikens prestanda medan de bibehöll en acceptabel storlek. Vidare fanns det en stor potential inom lyftindustrin att genom elektrifiering kunna minska utsläpp och bränsleförbrukning. Nyckelord: elektromekanisk cylinder, konceptutveckling, kaskadväxel

In this thesis a theoretical model for indoor propagation in a straight corridor with adjacent rooms is developed and evaluated. One objective is to assess the effect of different conductivities and permittivities in the walls between rooms have on the power levels, in both the corridor and the rooms. Furthermore, a model of a leaky cable is proposed for which the corresponding propagation characteristics are evaluated and compared to that of a dipole antenna to assess if a leaky cable is a viable alternative for radio coverage in an indoor environment. In order to evaluate the model, a wideband measurement campaign has been conducted at 2.44 GHz with a 40 meter long leaky coaxial cable and two vertically polarized dipole antennas. The proposed model is based on the waveguide model in 2D, the mode matching method and cascade coupling of scattering matrices. A section of a corridor is modeled as waveguides with different cross section where one waveguide contains a dielectric medium which models the wall between two rooms. Mode matching is used to determine how the waveguide modes are coupled at the boundaries between the waveguides and the result is collected in a scattering matrix. Multiple corridor sections are then connected together, by cascade coupling the corresponding scattering matrices of each section, into a long corridor with adjacent rooms. Point sources are used to excite the waveguides as an approximation of dipole transmitting antennas. Moreover, the radiating slots in the leaky cable are modeled by multiple point sources that are phase and amplitude shifted in order to achieve the same radiation direction and longitudinal loss as the leaky cable. Finally, the inverse discreet Fourier transform is applied to the wideband electromagnetic field distribution in order to determine the propagation characteristics in the time domain. The results from the model are in good quantitative agreement with the measurement data, and it is shown that a leaky cable give a more even radio coverage in an office corridor compared to a dipole antenna, especially when the internal walls are highly reflective. Moreover, it is shown that the direct path is dominating for transmission between rooms with transparent walls, like plasterboard, while the main propagation path for highly reflective walls is along the corridor.

Endwall contouring has been widely studied as an effective measure to improve aerodynamic performance by reducing secondary flow strength. The effects of endwall contouring with discrete holes and an upstream purge slot for a high turning (127") airfoil passage under transonic conditions are investigated. The total pressure loss and secondary flow field were measured for two endwall geometries. The non-axisymmetric endwall was developed through an optimization study [1] to minimize secondary losses and is compared to a baseline planar endwall. The blade inlet span increased by 13 degrees with respect to the inlet in order to match engine representative inlet/exit Mach number loading in a HP turbine.  The experiments were performed in a quasi-2D linear cascade with measurements at design exit Mach number 0.88 and incidence angle. Four cases were analyzed for each endwall -- the effect of slot presence (with/without coolant) and the effect of discrete holes (with/without coolant) without slot injection. The coolant to mainstream mass flow ratio was set at 1.0% and 0.25% for upstream purge slot and discrete holes, respectively.  Aerodynamic loss coefficient is calculated with the measured exit total pressure at 0.1 Cax downstream of the blade trailing edge. CFD studies were conducted in compliment. The aero-optimized endwall yielded lower losses than baseline without the presence of the slot. However, in presence of the slot, losses increased due to formation of additional vortices. For both endwall geometries, results reveal that the slot has increased losses, while the addition of coolant further influences secondary flow development. / Master of Science

In dieser Arbeit wird ein neuer Ansatz beschrieben, elektroaktive Verbindungen auf mesoporösen Elektroden zu fixieren. Dies wurde durch die Bildung eines sich selbst organisierenden Monolayers auf der Innenseite eines mesoporösen Trägers (ITO, FTO, ATO, TiO2) erreicht. Dieser Layer wurde dann vernetzt und in Richtung des Porenzentrums weiter aufgebaut durch Substitutions- Kondensations- oder Elektropolymerisations- Reaktionen. Es wurde ein Vernetzungsverfahren entwickelt, welches die Herstellung stabiler elektrochromer Bilder mit verbessertem Kontrast und einer Haltbarkeit von mehr als 18 Monaten erlaubt. Es beinhaltet die Synthesen von molekularen Einheiten mit latent vorhandenen oder voll entwickelten elektrochromen Eigenschaften. Diese Einheiten waren 4,4´- Bipyridine, die entweder mit optionalen N-Alkyl, N-Benzyl oder N-Phenyl Gruppen mit nukleophilem oder elektrophilen Eigenschaften oder mit TiO2 Ankergruppen versehen waren. Die Kaskadenreaktion ergab Elektroden mit unterschiedlichen Oberflächenkonzentrationen und unterschiedlichen Pimerisationsgraden. Darüber hinaus gelang es, die Haltbarkeit und den Kontrast so weit zu steigern, dass sie kommerziellen Ansprüchen genügen. Die Optimierung der Gegenelektroden wurde durch ein ähnliches Verfahren unter Verwendung von Ferrocen- Derivaten erreicht. Die Ladungskapazitäten, die durch Multilayer Vernetzung auf ATO-Ferrocen Elektroden erhalten wurden, waren hervorragend mit Ausnahme der Tatsache dass ein schwach grüner Farbton, verursacht durch oxidiertes Ferrocen, vorhanden war. Schließlich wurde die Kaskadenreaktion auf B12 Derivate zur Herstellung von katalytisch aktiven TiO2 Elektroden angewandt. Die mit B12 modifizierten Elektroden zeigten verbesserte Stabilität, höhere turn over - Zahlen und größere turn over -Raten im Vergleich zu unvernetzten B12 modifizierten Elektroden.

The design of a precision current controller for quantum cascade lasers (QCLs) enables QCLs to be used for calibrating instruments in space-borne applications. This current controller design will enable constant wave (CW) or pulsed mode operation of QCL devices as calibration sources in a space environment. Any differences in the temperature between components of the current controller can result in an erroneous current through the QCL. This design will use previously demonstrated techniques from Pacific Northwest National Laboratory (PNNL) to minimize the effects of temperature changes on the desired current levels. A mathematical model is used to calculate what performance levels can be expected, and if the board can operate with a desired precision level of 0.1% of the desired power output of the QCL. This mathematical model shows the capability to control to the desired 0.1% output power stability with a change in the boards temperature of ±10◦C.

京都大学 / 0048 / 新制・論文博士 / 博士(工学) / 乙第12860号 / 論工博第4107号 / 新制||工||1609(附属図書館) / 31540 / (主査)教授 北野 正雄, 教授 川上 養一, 准教授 酒井 道 / 学位規則第4条第2項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM

京都大学 / 0048 / 新制・課程博士 / 博士(薬科学) / 甲第19669号 / 薬科博第57号 / 新制||薬科||7(附属図書館) / 32705 / 京都大学大学院薬学研究科医薬創成情報科学専攻 / (主査)教授 大野 浩章, 教授 高須 清誠, 教授 竹本 佳司 / 学位規則第4条第1項該当 / Doctor of Pharmaceutical Sciences / Kyoto University / DFAM

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京都大学 / 新制・課程博士 / 博士(工学) / 甲第24606号 / 工博第5112号 / 新制||工||1978(附属図書館) / 京都大学大学院工学研究科機械理工学専攻 / (主査)教授 松野 文俊, 教授 松原 厚, 教授 泉井 一浩 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DGAM

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