863 research outputs found
Instantaneous Kinematics and Singularities of Two Types of Under-Actuated Parallel Wrists
No full textS-(nS)PU-SPU and S-(nS)PU-2SPU are two out of three types of under-actuated wrists that are generated from the “ordinary” wrists of type S-3SPU (fully-parallel wrists), by replacing a spherical pair (S) with a nonholonomic spherical pair (nS) according to the rules stated in [1]. Position analysis, controllability, and path planning of these two wrist types have been addressed and solved in two previous papers [2, 3] of this author. Their kinetostatics and singularity analysis have not been addressed, yet; and they are studied in this paper.
[1] Grosch, P., Di Gregorio, R., and Thomas, F., 2010, “Generation of under-actuated manipulators with nonholonomic joints from ordinary manipulators,” ASME J. of Mechanisms and Robotics, 2(1): 011005-(8 pages).
[2] Di Gregorio R., 2011, “Under-Actuated Nonholonomic Parallel Wrists,” In: Proc. of the 13th World Congress in Mechanism and Machine Science (IFToMM 2011), Guanajuato, México, 19-25 June, 2011, Paper No. A12-264
[3] Di Gregorio, R., 2011, “On the S-(nS)PU-SPU and S-(nS)PU-2SPU under-actuated wrists,” Procs. of the ASME 2011 International Design Engineering Technical Conference & Computers and Information in Engineering Conference, IDETC/CIE 2011, August 28-31, 2011, Washington (DC, USA), Paper No.: DETC2011-47541
Co-authorship network dataset on psoriasis research papers from Medline database (1942-2013).
No full textA ".xlsx" file which provides data used by Gregorio González-Alcaide & collaborators in the article “Evolution of cooperation patterns in psoriasis research: co-authorship network analysis of papers in Medline (1942-2013).” The worksheet “labels” describes every variable. The worksheet “dataset” presents the following data:
PMID: PubMed Identifier for indexed documents in Pubmed used for the study. PMIDs do not change over time or during processing and are never reused.
DP: Date that the article was published.
FAU: Author name for articles published. From 2002 forward, the full author name of authors is provided, if available.
FAU-Revised: Author name after cleansing process. A standardization process of the variations in signatures from single authors was carried out. The main discrepancies we found were caused by one or more first or last names being included, the authors’ first names being either spelled out or abbreviated to the initials, and typos
Co-authorship network dataset on psoriasis research papers from Medline database (1942-2013).
No full textA ".xlsx" file which provides data used by Gregorio González-Alcaide & collaborators in the article “Evolution of cooperation patterns in psoriasis research: co-authorship network analysis of papers in Medline (1942-2013).” The worksheet “labels” describes every variable. The worksheet “dataset” presents the following data:
PMID: PubMed Identifier for indexed documents in Pubmed used for the study. PMIDs do not change over time or during processing and are never reused.
DP: Date that the article was published.
FAU: Author name for articles published. From 2002 forward, the full author name of authors is provided, if available.
FAU-Revised: Author name after cleansing process. A standardization process of the variations in signatures from single authors was carried out. The main discrepancies we found were caused by one or more first or last names being included, the authors’ first names being either spelled out or abbreviated to the initials, and typos
On the Voltage Stress Reduction in Hairpin Windings: Guidelines and Critical Aspects
No full textTransportation electrification roadmaps are pushing for step-change increase in power densities of electric drives, leading to rapidly growing developments of high-switching frequency wide-bandgap semiconductor based inverters. Meanwhile, induced high dV/dt can challenge the reliability of the stator winding insulation system. This study provides guidelines to mitigate the winding voltage stress through implementation of an improved modular hairpin winding layout featuring a multi-branch design, reconfigurable by simply reconnecting phase terminals and neutral points. This enables comparison of voltage distributions across different winding layout patterns. A high frequency electrical lumped parameter network for prediction of voltage stress distribution is further adopted, and validated through experimental tests carried out on different configurations. The downselected configuration reduces by 35% the maximum interturn voltage. Further sensitivity analyses at different rise times revealed that improvement could be limited to only 10-15% when rise times are in the range of tens of nanoseconds. Under these conditions, the first series turns connected to the inverter side are very sensitive to sudden voltage spikes and experience the highest voltage stress, even though they have fewer connecting conductors between them and adjacent layers. In general, the paper provides reliability-oriented hairpin winding design guidelines that address the integrity of the insulation system
Scientometrics analysis of research activity and collaboration patterns in Chagas cardiomyopathy
No full textAn XLSX Excel file which provides data used by Gregorio González-Alcaide & collaborators in the article “Scientometrics analysis of research activity and collaboration patterns in Chagas cardiomyopathy”
The worksheet “labels” describes the variables of the bibliographic databases that allow identifying the documents used to carry out the study.
The worksheet “documents” present the following data:
PMID: PubMed Identifier.
TI: Title of journal article.
AU: Author(s) of the document.
SO: Source/journal title.
PY: Publication year.
MH: Medical Subject Headings (controlled vocabulary of biomedical terms) that is used to describe the subject of each journal article in MEDLINE.
UT-WOS: Article Identifier in Web of Science (only present in articles indexed in Web of Science).
TC: Times Cites in Web of Science Core Collection
Scientometrics analysis of research activity and collaboration patterns in Chagas cardiomyopathy
No full textAn XLSX Excel file which provides data used by Gregorio González-Alcaide & collaborators in the article “Scientometrics analysis of research activity and collaboration patterns in Chagas cardiomyopathy”
The worksheet “labels” describes the variables of the bibliographic databases that allow identifying the documents used to carry out the study.
The worksheet “documents” present the following data:
PMID: PubMed Identifier.
TI: Title of journal article.
AU: Author(s) of the document.
SO: Source/journal title.
PY: Publication year.
MH: Medical Subject Headings (controlled vocabulary of biomedical terms) that is used to describe the subject of each journal article in MEDLINE.
UT-WOS: Article Identifier in Web of Science (only present in articles indexed in Web of Science).
TC: Times Cites in Web of Science Core Collection
Kinetostatics of S-(nS)PU-SPU and S-(nS)PU-2SPU Nonholonomic Parallel Wrists
No full textS-(nS)PU-SPU and S-(nS)PU-2SPU are two types of nonholonomic wrists that are generated from the “ordinary” wrists of type S-3SPU (fully parallel wrists (FPW)), by replacing a spherical pair (S) with a nonholonomic spherical pair (nS) according to the rules stated by Grosch et al. (2010, “Generation of Under-Actuated Manipulators With Nonholonomic Joints From Ordinary Manipulators,” ASME J. Mech. Rob., 2(1), p. 011005). Position analysis, controllability, and path planning of these two wrist types have been addressed and solved in two previous papers (Di Gregorio, R., 2012, “Type Synthesis of Underactuated Wrists Generated From Fully-Parallel Wrists,” ASME J. Mech. Des., 134(12), p. 124501 and Di Gregorio, R., 2012, “Position Analysis and Path Planning of the S-(nS)PU-SPU and S-(nS)PU-2SPU Underactuated Wrists,” ASME J. Mech. Rob., 4(2), p. 021006) of this author, which demonstrated that simple closed-form formulas are sufficient to control their configuration and to implement their path planning. Their kinetostatics and singularity analysis have not been addressed, yet; and they are studied in this paper. Here, the singularity analysis will reveal, for the first time, the existence of a somehow novel type of singularities, here named “jamming singularity,” that jams the platform motion in some directions and that is also present in all the parallel manipulators with SPU limbs (e.g., Gough-Stewart platforms) where it can be considered a particular type of “leg singularity.” Moreover, the static analysis will demonstrate that the reaction forces due to the static friction, in the nonholonomic constraint, can be controlled in the same way as the generalized forces exerted by the actuators, and that the possible slippage, in the same constraint, can be easily monitored and compensated
Roberto Gerhard’s Sound Compositions: A Historical-Philological Perspective. Archive, Process, Intent and reenactment
No full textThis research advances the current state of knowledge in the field of early tape music both empirically and methodologically. The purpose of this study is to evaluate the impact that the electronic medium exerted in the musical thinking of Roberto Gerhard, one of the most outspoken, prolific and influential composers in the Spanish diaspora whose musical legacy, for the most part unknown, is a major landmark in the early history of electroacoustic music. Gerhard’s personal tape collection, one of the largest historical archives of its kind reported in the literature, is exceptional for both its antiquity (50+-year-old tapes) and its abundance of production materials. Through the digitisation and analysis of the composer’s tape collection this research argues that the empirical study of audio documents sets out a basis for a broader understanding of textual processes. More specifically, the research demonstrates that the reconstruction of works based on magnetic tape sketches is a powerful method to advance the understanding of early tape music. This research also examines Gerhard’s sound compositions in relation to the post-war context in which they were composed. Finally, this research presents performance documentation that proposes an approach to the electroacoustic music repertoire in which creativity is not at odds with rigor and critical discernment demonstrating that archival study can be closely aligned to the concept of re-enactment
Kepa Andoni Ormaetxea, agakiaren egilea: (haur didaktikari buruzko lan honen azterketa)
No full textSe presenta la biografía y una serie de datos bibliográficos del autor, además de las circunstancias y el entorno en el que nació el libro. Gregorio Arren hace un estudio sobre "Agakia" destacando sus características principalesThe author introduces the biography and a series of bibliographical data of the author, in addition to the circumstances and the environment in which the book was written. Gregorio Arren makes a study on "Agakia" underlining its principal characteristic
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