Дисертації: "AHERS"

1

Lv, Qiuping. "Scaling Analysis for the Direct Reactor Auxiliary Cooling System for AHTRs." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1357312725.

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2

Lendrin, Helga. "Université Virtuelle Africaine : le paradoxe du processus d’industrialisation de l’enseignement supérieur en Afrique Subsaharienne." Thesis, Compiègne, 2021. http://www.theses.fr/2021COMP2627.

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Pourquoi financer le déploiement d'une technologie là où, faute d'infrastructures, celle-ci ne peut matériellement pas fonctionner correctement ? Si les objectifs avancés par la Banque mondiale, à l'origine du lancement de l'Université Virtuelle Africaine (UVA) en 1997, sont l'augmentation de l'accès à l'enseignement supérieur en Afrique couplée à des économies d'échelles, la question se pose de savoir quelle démocratisation est espérée lorsque le moyen qui doit la rendre possible ne peut tout simplement pas fonctionner par manque d'infrastructures. En s'appuyant sur le concept d'« hypertélie » développé par Gilbert Simondon (1958) pour désigner la suradaptation d'un objet technique dans un milieu inadapté à son fonctionnement, cette recherche doctorale propose d'appréhender le lancement de l'Université Virtuelle Africaine (UVA) comme une introduction anticipée des TIC et de la culture numérique par la Banque mondiale au sein d'universités traditionnelles d'Afrique subsaharienne avec pour objectif la mise en marché de l'enseignement supérieur. Objectif soutenu par la transformation de l'UVA en organisation intergouvernementale qui génère un mythe (Barthes, 1957 ; Simondon, 1958) caractérisé par la séparation entre une forme première et son fond idéologique, qui, ainsi libéré, peut se fixer à d'autres formes, s'articuler à d'autres fonds, et devenir une tendance générale. L'UVA acquiert ainsi une raison d'être : constituer une forme mythique capable de véhiculer des concepts qui se transforment en tendances sous forme de structures
Why fund the deployment of a technology where, due to lack of infrastructure, it cannot physically function properly? If the objectives put forward by the World Bank, at the origin of the launch of the African Virtual University (AVU) in 1997, are to increase access to higher education in Africa coupled with economies of scale, the question arises as to what democratisation is hoped for when the means that should make it possible simply cannot function due to lack of infrastructure. This is evidenced by the failure of the AVU in economic and pedagogical terms (Loiret, 2007), in contrast to its continued development through its transformation into a pan-African intergovernmental organisation in 2002. Based on the concept of 'hypertelia' developed by Gilbert Simondon (1958) to designate the over-adaptation of a technical object in an environment unsuited to its functioning, this doctoral research proposes to understand the launch of the African Virtual University (AVU) as an anticipated introduction of ICTs and digital culture by the World Bank within traditional universities in sub-Saharan Africa, with the objective of commodising higher education. This objective is supported by the transformation of the AVU into an intergovernmental organisation which generates a myth (Barthes, 1957; Simondon, 1958) characterised by the separation of a primary form from its ideological background, which, thus liberated, can be attached to other forms, articulated to other backgrounds, and become a general trend. The AVU thus acquires a reason to be : to constitute a mythical form capable of conveying concepts that are transformed into tendencies in the form of structures

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3

Ahlers, Eike Christoph [Verfasser]. "Beeinträchtigungen der subjektiven Schlafqualität bei Patienten mit Aufmerksamkeitsdefizit-/ Hyperaktivitätsstörung im Erwachsenenalter / Eike Ahlers." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2014. http://d-nb.info/1052221181/34.

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4

Ahlers, Olaf [Verfasser]. "Entwicklung und Kartierung lernerzentrierter, kompetenzbasierter medizinischer Curricula unter Berücksichtigung erforderlicher Ressourcen / Olaf Ahlers." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2019. http://d-nb.info/1176635115/34.

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5

Ruth, Nicolas [Verfasser], Holger [Gutachter] Schramm, and Michael [Gutachter] Ahlers. "Gute Musik. Repräsentation und Wirkung prosozialer Musik / Nicolas Ruth ; Gutachter: Holger Schramm, Michael Ahlers." Würzburg : Universität Würzburg, 2018. http://d-nb.info/116320188X/34.

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6

Ahlers, Bettina [Verfasser], and Bärbel [Akademischer Betreuer] Kahl-Nieke. "Inzidenz einer Kiefergelenkbeteiligung bei Patienten mit juveniler idiopathischer Arthritis / Bettina Ahlers. Betreuer: Bärbel Kahl-Nieke." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2012. http://d-nb.info/1024355616/34.

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7

Madgwick, Sebastian O. H. "AHRS algorithms and calibration solutions to facilitate new applications using low-cost MEMS." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.681552.

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Microelectromechanical System (MEMS) technology is advancing rapidly. Gyroscopes, accelerometers and magnetometers, also referred to as an Inertial Measurement Unit (IMU), has traditionally been associated with aerospace and industrial robotics but is now within every smart phone. The proliferation of these low-cost devices has facilitated countless new applications with many more still unrealised. This dissertation presents work towards this end. A significant contribution of this work was the development of novel Attitude and Heading Reference System (AHRS) algorithms that fuse together sensor data from an IMU to provide an absolute measurement of orientation relative to the Earth. The novel work presented on non-gyro IMU s demonstrated the potential practical benefits of such kinematically redundant sensor arrays. Low-cost MEMS can only be fully utilised if they are combined with a calibration solution to provide precise measurements with a determined accuracy. This dissertation presents a comprehensive calibration solution to the specific requirements of these sensors based on extensive characterisations investigations. The calibration solutions enable sensors costing <10 United States Dollar (USD) to achieve a static pitch/roll accuracy of <10 and a static heading accuracy of <2°. This performance is equivalent to commercial 1M Us costing up to 3000 USD. The AHRS algorithm and sensor calibration works were brought together in the development of three IMU hardware platforms. To date, >500 have been sold and the open-source associated algorithm downloaded> 10,000 times. Each platform addressed a specific design need and together these facilitated a wide range of new applications; demonstrated by the numerous scientific publications that resulted from collaborative projects and user projects.

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8

Ahlers, Matthias [Verfasser], and Johannes [Akademischer Betreuer] Hebebrand. "Die Validität des Qb-Tests als Diagnostikinstrument bei Kindern mit ADHS / Matthias Ahlers ; Betreuer: Johannes Hebebrand." Duisburg, 2019. http://d-nb.info/1177681684/34.

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9

Alshawa, Majd. "Contribution à la cartographie mobile : développement et caractérisation d’un système basé sur un scanner laser terrestre." Strasbourg, 2009. https://publication-theses.unistra.fr/public/theses_doctorat/2010/ALSHAWA_Majd_2010.pdf.

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La cartographie mobile est un sujet qui se démocratise et gagne en maturité avec la demande croissante des données tridimensionnelles urbaines et périurbaines. La présente thèse aborde la conception d’un système de cartographie mobile terrestre à faible coût avec la particularité d’avoir adapté un scanner laser terrestre pour une utilisation en mode mobile à faible vitesse. Notre objectif n’est pas de rivaliser en termes de performances avec les systèmes commerciaux mais plutôt de s’approprier les compétences scientifiques et technologiques qui permettront de proposer des solutions dans le domaine de cartographie mobile. Les opérations préalables à la mise en route du système, tel que la synchronisation et l’étalonnage sont exposées. Puis, des méthodes basées sur l’ajustement des modèles polynomiaux sont développées pour convenir aux différents trajets parcourus. Les données issues des différents capteurs (GPS/AHRS/TLS) sont testées et filtrées avant de les intégrer dans l’équation de géoréférencement direct. Il en résulte un nuage de points corrigé. Une étude exhaustive sur l’effet des erreurs de chaque capteur sur le nuage de points résultant est établie. La précision théorique est confrontée avec des jeux des données de référence pour valider l’analyse des erreurs. Un appareil photo numérique calibré est intégré dans notre système en tant que capteur de navigation. Une solution photogrammétrique est proposée pour améliorer la précision de la trajectométrie préalablement calculée par l’intégration des données GPS/AHRS. Pour conclure la thèse, une ouverture vers la modélisation géométrique est proposée pour exploiter la géométrie et la précision des données laser terrestres fournies par le système. Le prototype développé permet de fournir des nuages de points d’une précision de l’ordre de 10 à 15cm à une distance moyenne de 20 m
Mobile mapping technology has been developing with the growing demand of three-dimensional urban and peri-urban data. This thesis approach is based on the design of a low cost terrestrial mobile mapping system with the adaptation of a Terrestrial Laser Scanner for low dynamics. Our goal is not to compete in performance with commercial systems but rather to appropriate scientific and technological skills which will help in proposing solutions in the field of mobile mapping. Necessary operational settings, such as synchronization and calibration are explained. Then, some methods based on the adjustment of polynomial models are developed according to the traveled paths. Data from various sensors (GPS/ AHRS/TLS) are filtered and tested before their integration by direct georeferencing equation in order to produce a correct point cloud. A comprehensive study on the influence of errors of each sensor on the resulting point cloud is established. The theoretical precision is compared with reference data in order to validate the error analyze. A digital calibrated camera is integrated in the system as a navigation sensor. A photogrammetric solution is proposed to improve the accuracy of the orientation and the position calculated by integrating GPS/ AHRS. At the end of this thesis, an approach towards automatic modeling is proposed to make use of the geometry and precision provided by the system. The designed prototype supplies point clouds whose precision is about 10 to15 cm at the average distance of 20 m

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10

Ahlers, Elke [Verfasser]. "Leistung(sdruck), Arbeitssystem und Gesundheit. : Eine quantitativ empirische Auswertung der WSI-Betriebsrätebefragungen zu ergebnisorientierten Arbeitssystemen. / Elke Ahlers." Berlin : Duncker & Humblot, 2016. http://d-nb.info/1238436323/34.

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11

Alandry, Boris. "Intégration de systèmes multi-capteurs CMOS-MEMS : application à une centrale d’attitude." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20152/document.

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Les systèmes électroniques actuels intègrent de plus en plus de fonctionnalités nécessitant l'intégration de capteurs très variés. Ces systèmes hétérogènes sont complexes à intégrer notamment lorsque différentes technologies de fabrication sont nécessaires pour les capteurs.Les technologies de fabrication de MEMS avec un procédé CMOS-FSBM offrent un coût de production réduit et permettent d'intégrer sur un même substrat différents types de capteurs (magnétomètres et accéléromètres notamment). Ce procédé de fabrication implique cependant une détection résistive des capteurs avec tous les problèmes qui lui sont associés (faible sensibilité, offset important, bruit de l'électronique). A travers la réalisation de la première centrale inertielle sur une puce, cette thèse renforce l'intérêt d'une approche « CMOS-MEMS » pour la conception de systèmes multi-capteurs. Le système est basé sur une mesure incomplète du champ magnétique terrestre (axes X et Y) et sur la mesure complète du champ gravitationnel. Une électronique de conditionnement des capteurs performante a été développée adressant les principaux problèmes relatifs à une détection résistive permettant ainsi une optimisation de la résolution de chaque capteur. Enfin, deux algorithmes ont été développés pour la détermination de l'attitude à partir de la mesure des cinq capteurs montrant la faisabilité et l'intérêt d'un tel système
Current electronic systems integrate more and more applications that require the integration of various kinds of sensors. The integration of such heterogeneous systems is complex especially when sensor fabrication processes differ from one to another. MEMS manufacturing processes based on CMOS-FSBM process promote a low-cost production and allow the integration of various types of sensors on the same die (e.g., magnetometers and accelerometers). However, this manufacturing process requires that sensors make use of resistive transduction with its associated drawbacks (low sensitivity, offset, electronic noise). Through the design and the implementation of the first inertial measurement unit (IMU) on a chip, this thesis demonstrates the interest of a “CMOS-MEMS” approach for the design of multi-sensor systems. The IMU is based on the incomplete measurement of the Earth magnetic field (X and Y axis) and the complete measurement of the gravity. An efficient front-end electronic has been developed addressing the most important issues of resistive transduction and thus allowing an optimization of sensor resolution. Finally, two attitude determination algorithms have been developed from the five sensor measurements showing the feasibility and the interest of such a system

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12

Ahlers, Philipp [Verfasser]. "Verbraucherschutz durch deliktsrechtliche Transformationsnormen : Die Durchsetzung nicht privatrechtlicher Verbraucherschutzregelungen durch das Deliktsrecht in Deutschland und England / Philipp Ahlers." Baden-Baden : Nomos Verlagsgesellschaft mbH & Co. KG, 2018. http://d-nb.info/1163023841/34.

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13

Ozgeneci, Ercin Mehmet. "Mems Sensor Based Underwater Ahrs(attitude And Heading Reference System) Aided By Compass And Pressure Sensor." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614619/index.pdf.

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Attitude and Heading angles are crucial parameters for navigation. Conventional navigation methods mostly uses IMU and GPS devices to calculate these angles. MEMS technology offers small sized, low cost IMU sensors with moderate performance. However, GPS cannot be used in underwater. Therefore, different aiding sensors are used in underwater vehicles in order to increase the accuracy. As the accuracy of devices increases, the cost of these devices also increases. In this thesis, rather than using GPS and high quality IMU sensors, low cost MEMS IMU sensor is used together with a magnetometer and a pressure sensor as aiding sensors. Considering the IMU error model and motion dynamics, two systems are designed and simulated using real data. The results seem to be satisfactory and using pressure sensor as an aiding sensor improves the attitude angles estimation.

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14

Lindberg, Hannah. "Design and Implementation of a Glider Control System." Thesis, KTH, Optimeringslära och systemteori, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-167355.

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ROBEX is a unique research project combining Airbus Defence and Space’s robotics expertise with deep-sea exploration technology to discover more about the most extreme environments environments known to man. As a part of this project, a deep-sea glider called MOTH, is under development with the objective to determine whether gliders can be used as a platform for bathymetric and electromagnetic soundings of the seafloor as well as for new water column research. This master’s thesis aims to design and implement the MOTH glider’s control system. The glider will have an independent emergency system, a power unit, an on-board computer (OBC), actuators, navigation sensors and scientific measurement instruments which can be swopped between missions and are connected via remote terminal units. The selected OBC is a Linux embedded Axotec GX-6300 with RS232 and CAN bus interfaces, as selected in the electrical architecture, and the chosen operative system is Linux Debian. The glider communicates with GNS/Iridium antenna and also has an ethernet cable link for ground station operations and a future option of an acoustic transceiver. To control actuation, the glider is equipped with a rudder, a left and a right wing flap, a moveable mass and a buoyancy tank. It travels in sawtooth patterns and is therefore always descending, ascending or transitioning during operation and at times ascending all the way to the surface to transmit and receive data via satellite communication. A model based feedback controller for longitudinal control has been programmed based on the equations of motion described in this report. The modelled longitudinal trajectory is as desired until a transition point is reached, the model is, presumable because of the uncertainty of the model parameters, unstable as the actuators are unable to correct the pitch angle. An AHRS navigation sensor emulator and an OBC emulator have been programmed to simulate the communication between these two and the emulated system is well operating both as a continuous stream and for polling data. The emulator and the pitch controller, when updated parameter values are available, will be used for simulation and verification tests in the laboratory environment. The ROBEX alliance will, if the objectives with the MOTH glider are met, continue to design gliders with the aim to increase the maximum duration time and speed in order to reach greater depths of the oceans.

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15

Lino, Rúben José Simões. "Low cost inertial-based localization system for a service robot." Master's thesis, Faculdade de Ciências e Tecnologia, 2011. http://hdl.handle.net/10362/5680.

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Dissertation presented at Faculty of Sciences and Technology of the New University of Lisbon to attain the Master degree in Electrical and Computer Science Engineering
The knowledge of a robot’s location it’s fundamental for most part of service robots. The success of tasks such as mapping and planning depend on a good robot’s position knowledge. The main goal of this dissertation is to present a solution that provides a estimation of the robot’s location. This is, a tracking system that can run either inside buildings or outside them, not taking into account just structured environments. Therefore, the localization system takes into account only measurements relative. In the presented solution is used an AHRS device and digital encoders placed on wheels to make a estimation of robot’s position. It also relies on the use of Kalman Filter to integrate sensorial information and deal with estimate errors. The developed system was testes in real environments through its integration on real robot. The results revealed that is not possible to attain a good position estimation using only low-cost inertial sensors. Thus, is required the integration of more sensorial information, through absolute or relative measurements technologies, to provide a more accurate position estimation.

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16

Ahlers, Volker [Verfasser], Arkady [Akademischer Betreuer] Pikovsky, Roberto [Akademischer Betreuer] Livi, and Lutz [Akademischer Betreuer] Schimansky-Geier. "Scaling and Synchronization in Deterministic and Stochastic Nonlinear Dynamical Systems / Volker Ahlers ; Arkady Pikovsky, Roberto Livi, Lutz Schimansky-Geier." Hannover : Hochschule Hannover, 2021. http://d-nb.info/1225349028/34.

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17

Ahlers, Elke [Verfasser], Ute [Akademischer Betreuer] Klammer, and Gerhard [Akademischer Betreuer] Bosch. "Der Zusammenhang zwischen ergebnisorientiert geführten Arbeitssystemen und den Arbeitsbedingungen von Beschäftigten / Elke Ahlers. Gutachter: Gerhard Bosch. Betreuer: Ute Klammer." Duisburg, 2014. http://d-nb.info/1057837245/34.

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18

Ahlers, Pia [Verfasser], Max J. [Akademischer Betreuer] Kääb, and Andreas [Akademischer Betreuer] Schicho. "Klinisches Outcome nach partieller Rekonstruktion bei ausgedehnter Ruptur der superioren und posterioren Rotatorenmanschette / Pia Ahlers ; Max J. Kääb, Andreas Schicho." Regensburg : Universitätsbibliothek Regensburg, 2020. http://d-nb.info/1211556743/34.

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19

Ahlers, Jörg [Verfasser], and Peter [Akademischer Betreuer] Lang. "Identifikation einer Zellpopulation mit Stammzellmarkern mit Korrelation zum klinischen Verlauf bei Diagnosestellung akuter kindlicher Leukämien / Jörg Ahlers ; Betreuer: Peter Lang." Tübingen : Universitätsbibliothek Tübingen, 2011. http://d-nb.info/1161411054/34.

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20

Rybczynski, Arthur [Verfasser], and M. Oliver [Akademischer Betreuer] Ahlers. "Manuelle Strukturanalyse zur Differenzierung craniomandibulärer Dysfunktionen - Verteilung muskulärer Befunde in einer klinischen Studie und diagnostischer Nutzen / Arthur Rybczynski. Betreuer: M. Oliver Ahlers." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2012. http://d-nb.info/1023947234/34.

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21

Ahlers, Michael [Verfasser], Gunther [Akademischer Betreuer] Wittstock, Thorsten [Akademischer Betreuer] Klüner, and Izabella [Akademischer Betreuer] Brand. "Electrochemical and spectroscopic analysis of collagen films and lipid bilayers on biomaterial surfaces / Michael Ahlers. Betreuer: Gunther Wittstock ; Thorsten Klüner ; Izabella Brand." Oldenburg : BIS der Universität Oldenburg, 2013. http://d-nb.info/1050299558/34.

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22

Ahlers, Andreas [Verfasser], Alois [Akademischer Betreuer] Fürstner, and Martin [Gutachter] Hiersemann. "Concise total synthesis of Enigmazole A & studies towards the total synthesis of Rhizoxin D / Andreas Ahlers ; Gutachter: Martin Hiersemann ; Betreuer: Alois Fürstner." Dortmund : Universitätsbibliothek Dortmund, 2017. http://d-nb.info/1139170813/34.

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23

Ahlers, Jonas [Verfasser], Alexander [Akademischer Betreuer] Scheffold, Roland [Gutachter] Lauster, and Alexander [Gutachter] Scheffold. "Die Induktion von Interleukin-10 in humanen T-Helfer-Zellen und seine transkriptionelle Regulation / Jonas Ahlers ; Gutachter: Roland Lauster, Alexander Scheffold ; Betreuer: Alexander Scheffold." Berlin : Technische Universität Berlin, 2017. http://d-nb.info/1156018242/34.

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24

Clarke, Jonathan H. A. "Navigation and autonomy of soaring unmanned aerial vehicles." Thesis, Loughborough University, 2012. https://dspace.lboro.ac.uk/2134/12337.

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The use of Unmanned Aerial Vehicles (UAV) has exploded over the last decade with the constant need to reduce costs while maintaining capability. Despite the relentless development of electronics and battery technology there is a sustained need to reduce the size and weight of the on-board systems to free-up payload capacity. One method of reducing the energy storage requirement of UAVs is to utilise naturally occurring sources of energy found in the atmosphere. This thesis explores the use of static and semi-dynamic soaring to extract energy from naturally occurring shallow layer cumulus convection to improve range, endurance and average speed. A simulation model of an X-Models XCalibur electric motor-glider is used in combination with a refined 4D parametric atmospheric model to simulate soaring flight. The parametric atmospheric model builds on previous successful models with refinements to more accurately describe the weather in northern Europe. The implementation of the variation of the MacCready setting is discussed. Methods for generating efficient trajectories are evaluated and recommendations are made regarding implementation. For micro to small UAVs to be able to track the desired trajectories a highly accurate Attitude Heading Reference System (AHRS) is needed. Detailed analysis of the practical implementation of advanced attitude determination is used to enable optimal execution of the trajectories generated. The new attitude determination methods are compared to existing Kalman and complimentary type filters. Analysis shows the methods developed are capable of providing accurate attitude determination with extremely low computational requirements, even during extreme manoeuvring. The new AHRS techniques reduce the need for powerful on-board microprocessors. This new AHRS technique is used as a foundation to develop a robust navigation filter capable of providing improved drift performance, over traditional filters, in the temporary absence of global navigation satellite information. All these algorithms have been verified by flight tests using a mixture of manned and unmanned aerial vehicles and avionics developed specifically for this thesis.

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25

Ahlers, Christoph Joseph [Verfasser]. "Paraphilie und Persönlichkeit : eine empirische Untersuchung zur Prävalenz von Akzentuierungen der Sexualpräferenz und ihrem Zusammenhang mit dem Fünf-Faktoren-Modell der Persönlichkeit / Christoph Joseph Ahlers." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2010. http://d-nb.info/1024335496/34.

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26

Ahlers, Christoph J. [Verfasser]. "Paraphilie und Persönlichkeit : eine empirische Untersuchung zur Prävalenz von Akzentuierungen der Sexualpräferenz und ihrem Zusammenhang mit dem Fünf-Faktoren-Modell der Persönlichkeit / Christoph Joseph Ahlers." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2010. http://nbn-resolving.de/urn:nbn:de:kobv:188-fudissthesis000000017010-7.

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27

Li, Peng. "A vehicle-based laser system for generating high-resolution digital elevation models." Diss., Manhattan, Kan. : Kansas State University, 2010. http://hdl.handle.net/2097/3890.

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28

Leccadito, Matthew. "A Kalman Filter Based Attitude Heading Reference System Using a Low Cost Inertial Measurement Unit." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/3189.

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This paper describes, the development of a sensor fusion algorithm-based Kalman lter ar- chitecture, in combination with a low cost Inertial Measurement Unit (IMU) for an Attitude Heading Reference System (AHRS). A low cost IMU takes advantage of the use of MEMS technology enabling cheap, compact, low grade sensors. The use of low cost IMUs is primar- ily targeted towards Unmanned Aerial Vehicle (UAV) applications due to the requirements for small package size, light weight, and low energy consumption. The high dynamics nature of smaller airframes, coupled with the typical vibration induced noise of UAVs require an e cient, reliable, and robust AHRS for vehicle control. To eliminate the singularities at 90 on the pitch and roll axes, and to keep the computational e ciency high, quaternions are used for state attitude representation.

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29

Grandi, Stefano. "Sistemi navigazionali multi sensore per il posizionamento in presenza di brevi periodi di GPS outage." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3992/.

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Il posizionamento terrestre negli ultimi anni è stato sempre più facilitato dallo sviluppo delle tecniche satellitari, che permettono di localizzare un punto sulla superficie terrestre con precisioni superiori a quelle richieste per la pura navigazione, tramite la comunicazione tra ricevitore e satelliti. Per la disponibilità del sistema satellitare è indispensabile l’intervisibilità ottica satellite - ricevitore, condizione che viene a mancare nel caso ad esempio di trekking sottobosco, a causa della copertura data da manto vegetale e chiome arboree che non permettono una corretta triangolazione geometrica satellitare. Rientrano nei sistemi navigazionali anche le piattaforme inerziali, sistemi che rilevano le accelerazioni impresse e l’orientamento della piattaforma stessa. Se montati su un veicolo possono fungere da ausilio alla determinazione dell’ “attitude”, cioè dell’atteggiamento del veicolo durante il suo movimento in uno spazio tridimensionale. In questo lavoro ci si propone di unire i benefici delle due tecnologie, satellitari e inerziali, grazie alla complementarietà delle loro caratteristiche sugli errori, unendone le potenzialità e verificando i benefici prodotti dal loro uso integrato. In particolare si utilizzeranno dispositivi di costo relativamente contenuto.

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30

Dannhauer, Michael [Verfasser], Michael [Akademischer Betreuer] Ahlers, Michael [Gutachter] Rappe, and Ilka [Gutachter] Siedenburg. "(Über-)Leben als Popmusiker*in : eine empirische Untersuchung zur tertiären Ausbildung, dem Tätigkeitsprofil sowie den professionellen Herausforderungen und Kompetenzbeständen von Berufsmusiker*innen im Bereich populärer Musik / Michael Dannhauer ; Gutachter: Michael Rappe, Ilka Siedenburg ; Betreuer: Michael Ahlers." Lüneburg : Leuphana Universität Lüneburg, 2020. http://d-nb.info/1212660641/34.

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Ahern, Sean Xavier. "The Clash and Mass Media Messages from The Only Band That Matters." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1340661045.

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32

Boiardi, Andrea. "Study of a Procedure for Unit Load Transport Simulation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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Accurate transport simulation is necessary to determine the probability that a unitary load might be disassembled or subject to severe structural changes while travelling to its destination. With the evaluations that come from accurate transport simulation companies might be able, for example, to optimize for the amount of plastic to use in the wrapping process of a unitary load. Other than the obvious immense cost reduction given by a lower incidence of product-ruining accidents during transport, optimizing plastic usage would also help avoid over-wrapping, resulting in better environmental outcomes. Currently, multi-axial simulation is more and more being adopted by companies in the hopes of representing more closely the stresses a load is subject to during transport. However, there is no international standard outlining a procedure that one might follow in order to do so, yet. This work starts from the identification of the best methods to record simulation-oriented transport data precisely and reliably. Some recordings of different types of transport have been conducted to highlight their different nature and to show an example of how to use a sensor in different contexts. Then, the main existing methods for simulating transport are analyzed and used to create a new procedure for the selection of the most suitable one, mainly depending on the availability of technological resources and transport data. Lastly, considerations about possible future improvements on this work are presented.

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Ahlers, Ruth [Verfasser]. "Polymere Carboxylate der 13. Gruppe / vorgelegt von Ruth Ahlers." 2007. http://d-nb.info/984960783/34.

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34

Ahlers, Mareike [Verfasser]. "Neuartige Precursor zur Abscheidung von Selten-Erd-Oxiden / von Mareike Ahlers." 2010. http://d-nb.info/1007416114/34.

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35

Liu, Hsin-Wu, and 劉炘武. "Autonomous Navigation of UGV Based on AHRS, GPS and LiDAR." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/04097425845260892403.

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碩士
國立雲林科技大學
機械工程系
102
The thesis presents a method for the navigation and obstacle avoidance of an Unmanned Ground Vehicle (UGV), which integrated the Global Positioning System (GPS), Attitude and Heading Refrence System (AHRS) and Light Detection and Ranging sensor (LiDAR). With GPS and AHRS sensor, relative position between the target and the vehicle itself and heading of the vehicle could be determined. With a LiDAR sensor, the environment could also be perceived by the vehicle. The thesis has developed a path-planning algorithm which integrated all the data acquired by these sensors, in order to avoid obstacles in the environment and reach the target defined by GPS at the same time. The thesis has developed an UGV named `Yun-Trooper \nolinebreak II' based on a 4-wheel-drived remote-controlled model car. It was equipped with an ARM-Based embedded GNU/Linux computer to make calculation and control, and all the program were developed by C++ programming language. The thesis has integrated the GPS navigation and obstacle avoidance algorithms, modified the VFH+ obstacle avoidance algorithm to adapt the data acquired by LiDAR. The modified version of VFH+ offers several improvements that overcomes the inability of VFH+ in some environments.

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Ahlers, Christian [Verfasser]. "Realistische dreidimensionale Bildgebung von Krankheitsbildern der Macula lutea / vorgelegt von Christian Ahlers." 2004. http://d-nb.info/981232655/34.

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Li, Huei-Ching, and 李惠卿. "The roles of Zebrafish AHR repressors(AHRRs) in pituitary and retina development." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/00218866223633697484.

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Ahlers, Volker [Verfasser]. "Scaling and synchronization in deterministic and stochastic nonlinear dynamical systems / von Volker Ahlers." 2001. http://d-nb.info/963659995/34.

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Ahlers, Karoline [Verfasser]. "Referenzbereiche für Insulin, Insulinwachstumsfaktor-1 und Adrenocorticotropes Hormon der Ponys / eingereicht von Karoline Ahlers." 2010. http://d-nb.info/1009875299/34.

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Jing-JieHuang and 黃敬傑. "Development and Verification of IWLMA Calibration Method and AHRS Algorithm Based on IMU." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/6ktrc4.

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碩士
國立成功大學
航空太空工程學系
106
Implementation of low-cost Microelectromechanical Systems Inertia Measurement Unit (MENS-IMU) has been more and more popular over the past few years. Recently, IMU has been used for wide varieties of consumer electronics, including smartphones, smart watches and so on. Under some situations IMU has been also used to detect the gesture of the human limbs. To precisely estimate the motion information, the calibration process of the IMU is indispensable. In general, the calibration procedures are usually conducted under a clean and perturbation free environment. However, such a perfect situations may not always be available. As a result, in this paper, the calibration subject to external perturbation is considered. An iterative weighted Levenberg-Marquardt algorithm (IWLMA) is proposed to cope with the perturbation issue. Experiment data are conducted to verify the proposed IWLMA method under the imperfect situations. The 9 degree of freedom (DOF) complementary filter based attitude heading reference system (AHRS) algorithm method will be introduced. Complementary filter consumes less computation effort than Kalman filter, as a result, it is suitable to implemented on the microprocessor. Quaternion is used in the proposed AHRS algorithm to calculate the attitude of a vehicle, unlike Euler angles, quaternion can describe the attitude of a vehicle without singularity problem. According to the estimated attitude information, the velocity can be calculated by using integration of the data from accelerometer. The estimated velocity from accelerometer and the estimated velocity from optical flow module PX4FLOW will be fused together by using the velocity fusion algorithm, thus improve accuracy of the estimated velocity. Three axis rotational platform (Gimbal) has been designed and built to verify the performance the proposed AHRS algorithm.

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Ahlers-Niemann, Arndt [Verfasser]. "Auf der Spur der Sphinx : Sozioanalyse als erweiterter Rahmen zur Erforschung von Organisationskulturen / vorgelegt von Arndt Ahlers-Niemann." 2006. http://d-nb.info/983013322/34.

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(5930570), Arpan Chakraborty. "DETECTING GA AIRCRAFT HAZARDOUS STATE USING A LOW-COST ATTITUDE AND HEADING REFERENCE SYSTEM." Thesis, 2019.

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General Aviation (GA) accidents constitute the majority of aviation related accidents. In the United States, there have been over 7,000 GA accidents compared to 190 airline accidents in the last 8 years. Flight data analysis has helped reduce the accident rate in commercial aviation. Similarly, safety analysis based on flight data can help GA be safer. The FAA mandates flight data recorders for multi-engine and turbine powered aircraft, but nearly 80% of General Aviation consists of single engine, of which only a small portion contain any form of data recording device. GA aircraft flight data recorders are costly for operating pilots. Low-cost flight recorders are few and rarely used in GA safety analysis due to lack of accuracy compared to the certified on-board equipment. In this thesis, I investigate the feasibility of using a low-cost Attitude and Heading Reference System (AHRS) to detect hazardous states in GA aircraft. I considered the case of roll angles and found that the low-cost device has significant measurement errors. I developed models to correct the roll angle error as well as methods to improve the detection of hazardous roll angles. I devised a method to evaluate the time accuracy along with the angle accuracy and showed that despite the errors, the low-cost device can provide partial hazardous state detection information.

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Lüer, Juliana. "Design and Development of a Measurement System to Track the Motion of a Point Absorber." Thesis, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-416222.

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Because of climate change renewable energy field is becoming more and more relevant. Renewable energy can be gained from the sun, from wind but also from ocean waves. To support the research and development in this field reliably measured wave data is collected through a measurement system that shows the exact position of a buoy. The project consists of the design, development and implementation of such a measurement system. It is divided into three subtasks: The power supply based on a solar panel and a battery The measurement part including a sensor and its implementation to the circuit The deployment of a module for data transmission and communication between the measurement system and the on-shore computer The power supply is capable to power the system and to maintain the battery voltage. A suggested stronger power supply will be used in a later state of the project to increase the reliability. The results of the charging test are good. The power supply system is connected to the circuit and the battery charges. For the measurement system the altitude and heading reference system (AHRS) “Ellipse2-D” from SBG Systems has been selected and connected to an Arduino Mega 2560. The AHRS provides raw data and values processed by a Kalman filter. Both data sets are picked up by the microcontroller. The raw data is backed up on a secure digital memory card (SD-card). For the evaluation of the sensor unit, static and dynamic tests are applied to the sensor. In the end it can be seen that the measurement series are aligned with each other. The information from the Kalman model of the AHRS is transmitted with the Adeunis ARF868 ultra-long range (ULR) modem. The transmitter is linked to the Arduino Mega 2560 and the sensor data is transmitted to the receiver. The first field test already shows the reliability of the system for a range of about 3 km. The results of the tests are as expected and in the future this system will be implemented on a buoy.

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