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  • 1
    Online Resource
    Online Resource
    Field-based Tests for Soccer Players : Methodological Concerns and Applications (2022)
    Cham :Springer International Publishing :
    Details
    Keywords: Sports sciences. ; Measurement. ; Measuring instruments. ; Mechanics. ; Quantitative research. ; Sport Science. ; Measurement Science and Instrumentation. ; Sports Biomechanics. ; Classical Mechanics. ; Data Analysis and Big Data.
    Description / Table of Contents: Chapter 1. Introduction: Rationale for understanding accuracy, precision, and repeatability levels of field-based tests -- Chapter 2. Systematically revising the literature of field-based soccer tests -- Chapter 3. Summarizing and characterizing the field-based soccer tests -- Chapter 4. Evidence of accuracy, precision, and repeatability levels of field-based tests -- Chapter 5. Discussion of field-based soccer tests for aerobic fitness -- Chapter 6. Discussion of field-based soccer tests for sprinting, change-of-direction and agility -- Chapter 7. Discussion of field-based soccer tests for strength, power, and neuromuscular fitness -- Chapter 8. Conclusions & practical implications.
    Abstract: This book systematically summarizes the accuracy, precision, and repeatability levels of field-based tests applied in soccer. It considers such details as the effectiveness of tests for different age categories and sexes. In this book, the readers will be able to check all the field-based tests conceived for fitness assessment in soccer through a large systematic review made to the literature. In addition a brief characterization of each test and presentation of the concurrent validity and repeatability levels for each test will be provided. Finally, the book contains a general discussion of the implications of the tests for different methodological approaches to training. It will be use to sports scientists and practitioners.
    Type of Medium: Online Resource
    Pages: VIII, 110 p. 2 illus. , online resource.
    Edition: 1st ed. 2022.
    ISBN: 9783031038952
    Series Statement: SpringerBriefs in Applied Sciences and Technology,
    URL: https://doi.org/10.1007/978-3-031-03895-2
    DOI: 10.1007/978-3-031-03895-2
    DDC: 796.015
    Language: English
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    E-BOOKS (AWI ONLY)
  • 2
    Electronic Resource
    Electronic Resource
    Reducing Motion Inaccuracies on a Mobile Robot (1998)
    Springer
    Journal of intelligent and robotic systems 21 (1998), S. 197-219 
    Details
    ISSN: 1573-0409
    Keywords: control quantisation errors ; mobile robot
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this article we present two algorithms, for reducing the effects of control-space quantisation errors on a Khepera mobile robot. Specifically, we consider that control-space quantisation is present, when there is only a finite set of available robot wheels velocities. Thus the velocities of the robot wheels can not be chosen from any point in a continuous set. The first algorithm can be used to perform pure rotations (no translation) of the mobile robot while reducing the effects of these errors. The second algorithm can be used to perform robust straight-line motions, between the mobile robot current position, and a predefined goal position in its working environment. Simulation results demonstrating the effectiveness of the algorithm will be presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007978501619
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    3D Surface-Tracking with a robot manipulator (1996)
    Springer
    Journal of intelligent and robotic systems 15 (1996), S. 401-417 
    Details
    ISSN: 1573-0409
    Keywords: Surface tracking ; surface following ; contact frame calibration ; force sensing ; control ; robots
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper presents incremental research in Surface Tracking with a robot manipulator. Surface tracking is an important operation in self-teaching and exploratory tasks in unknown environments, and to cope with inaccurate workspace and environment modeling. The paper addresses the problem of 3D Surface-Tracking in contact, where the main concern is the angle formed between the end-effector and the surface. This study constitutes a first approach to the more general and important problem of surface following in contact. The new contribution is the 3D tracking operation based on a new alignment control algorithm using real-time contact force feedback. Simulations, and experimental results using the PUMA 560 manipulator demonstrate the feasibility of the proposed algorithm. This paper also presents a method for tool-tip contact frame calibration using forces/moments data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437604
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    Paper (German National Licenses)
    Fulltext
  • 4
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    Filling the gaps of dinosaur eggshell phylogeny: Late Jurassic Theropod clutch with embryos from Portugal (2013)
    Springer Nature
    Details
    Publication Date: 2013-05-31
    Description: The non-avian saurischians that have associated eggshells and embryos are represented only by the sauropodomorph Massospondylus and Coelurosauria (derived theropods), thus missing the basal theropod representatives. We report a dinosaur clutch containing several crushed eggs and embryonic material ascribed to the megalosaurid theropod Torvosaurus. It represents the first associated eggshells and embryos of megalosauroids, thus filling an important phylogenetic gap between two distantly related groups of saurischians. These fossils represent the only unequivocal basal theropod embryos found to date. The assemblage was found in early Tithonian fluvial overbank deposits of the Lourinhã Formation in West Portugal. The morphological, microstructural and chemical characterization results of the eggshell fragments indicate very mild diagenesis. Furthermore, these fossils allow unambiguous association of basal theropod osteology with a specific and unique new eggshell morphology. Scientific Reports 3 doi: 10.1038/srep01924
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 5
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    Influence of Geometric Dimensions on the Performance of Switched Reluctance Machine (2019)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2019-11-13
    Description: In a design of a switched reluctance machine, there are a number of parameters that are chosen empirically inside a certain interval, therefore to find an optimum geometry it is necessary to determine how each parameter acts on the performance of the machine. This work presents a study on the influence of geometric dimensions on the performance of the switched reluctance machine. The analysis is done through finite element simulations based on the variation of one parameter while the others are fixed. Graphical and numerical results of torque and magnetic flux are presented for a 6/4 three-phase machine and an 8/6 four-phase machine. The study presented aims to provide consistent data on which dimensions should be modified for specific applications, and thus to base choices made in the design and optimization stage.
    Electronic ISSN: 2075-1702
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Molecular Diversity Preservation International
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  • 6
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    Inversion-Based Approach for Detection and Isolation of Faults in Switched Linear Systems (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-03-27
    Description: This paper addresses the problem of the left inversion of switched linear systems from a diagnostics perspective. The problem of left inversion is to reconstruct the input of a system with the knowledge of its output, whose differentiation is usually required. In the case of this work, the objective is to reconstruct the system’s unknown inputs, based on the knowledge of its outputs, switching sequence and known inputs. With the inverse model of the switched linear system, a real-time Fault Detection and Isolation (FDI) algorithm with an integrated Fuzzy Logic System (FLS) that is capable of detecting and isolating abrupt faults occurring in the system is developed. In order to attenuate the effects of unknown disturbances and noise at the output of the inverse model, a smoothing strategy is also used. The results are illustrated with an example. The performance of the method is validated experimentally in a dc-dc boost converter, using a low-cost microcontroller, without any additional components.
    Electronic ISSN: 2079-9292
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Molecular Diversity Preservation International
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  • 7
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    EMI Filter Design for a Single-stage Bidirectional and Isolated AC–DC Matrix Converter (2018)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2018-11-12
    Description: This paper describes the design of an electromagnetic interference (EMI) filter for the high-frequency link matrix converter (HFLMC). The proposed method aims to systematize the design process for pre-compliance with CISPR 11 Class B standard in the frequency range 150 kHz to 30 MHz. This approach can be extended to other current source converters which allows time-savings during the project of the filter. Conducted emissions are estimated through extended simulation and take into account the effect of the measurement apparatus. Differential-mode (DM) and common-mode (CM) filtering stages are projected separately and then integrated in a synergistic way in a single PCB to reduce volume and weight. A prototype of the filter was constructed and tested in the laboratory. Experimental results with the characterization of the insertion losses following the CISPR 17 standard are provided. The attenuation capability of the filter was demonstrated in the final part of the paper.
    Electronic ISSN: 2079-9292
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Molecular Diversity Preservation International
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  • 8
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    Self-Evolving Fuzzy Controller Composed of Univariate Fuzzy Control Rules (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-08-23
    Description: The paper proposes a methodology to online self-evolve direct fuzzy logic controllers (FLCs), to deal with unknown and time-varying dynamics. The proposed methodology self-designs the controller, where fuzzy control rules can be added or removed considering a predefined criterion. The proposed methodology aims to reach a control structure easily interpretable by human operators. The FLC is defined by univariate fuzzy control rules, where each input variable is represented by a set of fuzzy control rules, improving the interpretability ability of the learned controller. The proposed self-evolving methodology, when the process is under control (online stage), adds fuzzy control rules on the current FLC using a criterion based on the incremental estimated control error obtained using the system’s inverse function and deletes fuzzy control rules using a criterion that defines “less active” and “less informative” control rules. From the results on a nonlinear continuously stirred tank reactor (CSTR) plant, the proposed methodology shows the capability to online self-design the FLC by adding and removing fuzzy control rules in order to successfully control the CSTR plant.
    Electronic ISSN: 2076-3417
    Topics: Natural Sciences in General
    Published by Molecular Diversity Preservation International
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  • 9
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    The reaction of anthranilonitrile and triethylorthoformate revisited: formation of dimeric and trimeric species (2010)
    Elsevier
    Details
    Publication Date: 2010-11-01
    Print ISSN: 0040-4020
    Electronic ISSN: 1464-5416
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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  • 10
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    Dynamic Model and Inverse Kinematic Identification of a 3-DOF Manipulator Using RLSPSO (2020)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2020-01-11
    Description: This paper presents the identification of the inverse kinematics of a cylindrical manipulator using identification techniques of Least Squares (LS), Recursive Least Square (RLS), and a dynamic parameter identification algorithm based on Particle Swarm Optimization (PSO) with search space defined by RLS (RLSPSO). A helical trajectory in the cartesian space is used as input. The dynamic model is found through the Lagrange equation and the motion equations, which are used to calculate the torque values of each joint. The torques are calculated from the values of the inverse kinematics, identified by each algorithm and from the manipulator joint speeds and accelerations. The results obtained for the trajectories, speeds, accelerations, and torques of each joint are compared for each algorithm. The computational costs as well as the Multi-Correlation Coefficient ( R 2 ) are computed. The results demonstrated that the identification accuracy of RLSPSO is better than that of LS and PSO. This paper brings an improvement in RLS because it is a method with high complexity, so the proposed method (hybrid) aims to improve the computational cost and the results of the classic RLS.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by Molecular Diversity Preservation International
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