130,649 research outputs found
Realtime thévenin equivalent impedance at a PCC in the Italian power grid
No full textThe increase of Distributed Energy Resources (DER) in distribution networks has underlined the need for new strategies to optimally operate DERs by increasing efficiency in generation and distribution of power. Optimal Power Injection enabled by Thévenin equivalent impedance (TEI) measurements is one of such possible strategies, since this permits the evaluation of the optimal currents that need to be injected into or drawn from a network, in order to reduce energy losses. The first measurement campaign was performed in a three phase four wire point of common coupling (PCC) in Cape Town, South Africa, in which the possibility of multiple simultaneous measurement of the TEI of a power supply grid via two points of common coupling was analyzed. In this paper, the results of a measurement campaign to determine the dynamics TEI at a PCC in Italy is discussed. The results show that there is a significant level of imbalance in the TEI across the phases at the PCC
MeSH term explosion and author rank improve expert recommendations
Get PDFInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
Get PDFBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Scholarly Communication and Publishing Lunch and Learn Talk #11: The ULS Open Access Author Fee Fund
No full textAt the May 2014 talk, you will learn about the ULS Open Access Author Fee Fund--what it is, why we do it, how it works, and how the program is going so far
Proposed framework for integration of optimal current injection and multi-agent control of the LV distribution network
No full textThe low voltage (LV) Network has become more complex due to the addition of loads like Electric Vehicles (EVs) and generation from Renewable Energy Sources (RES). These additions will result in power quality issues arising from excess supply or load imbalances. As LV networks and power systems were not designed with these entities in mind, scalable and flexible mitigation strategies will be needed to tackle these problems. This paper presents a new implementation framework to address this challenge. The proposed framework consists of a Multi-Agent Control System (MAS) to coordinate the various independent entities (agents) and a Thevenin Equivalent Impedance (TEI) based estimator to measure real time load imbalances to determine optimal currents in real time and adjust supply/demand optimally to minimize losses
The R&D Tax Incentives
No full textThis article sets out some background information and reflections of the author on the R&D tax incentive schemes included in the Common Corporate Tax Base (CCTB) Proposal. In particular the author analyzes the stimulus to private R&D through ad hoc tax incentives included in the CCTB Proposal and dives into the actual provisions included in the Proposal highlighting the most relevant issues connected with their design and interpretation. Moreover, the author explores the interaction between the CCTB Proposal and the granting by Member States of domestic R&D tax incentives
The investigation and assessment of Nutritional and Traditional Supplement products for content validity, contamination and adulteration
No full textIncludes abstract.Includes bibliographical references.Nutritional supplements are used by competitive and recreational athletes of all ages. As a consequence the supplement industry has grown to meet the increasing demand. The regulation of the supplement industry is unrefined, which increases the risk of the nutritional supplements being contaminated. Contamination may be intentional, where the companies “spike” their products with an ergogenic aid, or unintentional. A consequence of contamination is that an athlete may fail a drug test after ingesting a contaminated supplement or there may be negative health consequences. Without adequate legislation it is difficult to control the industry and reduce the risk of contamination in the supplement. Objectives: To investigate the industry associated with commercially available nutritional and traditional supplements. These are in the five specific areas; (i) to review the regulations and legislations, and labelling and claims associated with nutritional products in the USA, European Union and South Africa, (ii) to assess the labelling and claims information on nutritional supplement products imported into and manufactured or assembled in South Africa, (iii) to assess using a survey questionnaire the container labelling and other sources of information that assist consumers of nutritional products in their purchasing decisions, (iv) to assess traditional commercial supplements for contamination and consistency of trace elements and heavy metals using Inductively Coupled Plasma-Mass Spectrometry, and (v) to assess the content of nutritional commercial supplements for steroids, stimulants and other compounds of interest using Tandem Liquid Chromatography-Mass Spectrometry.Methods: The thesis is divided into 6 Chapters. Chapter 1 describes the background to the problem and Chapter 2 reviews the existing legislation. In Chapter 3 the labelling and claims information on 40 nutritional supplements products are analysed, and the self-administered questionnaire determined what product label and other information influences consumers of nutritional supplements in their purchasing decisions. In Chapter 4 the consistency of trace elements and heavy metals are analysed in selected nutritional supplements using Inductively Coupled Plasma Mass Spectrometry. In Chapter 5 selected nutritional supplements are analysed for steroids, stimulants and other compounds using Tandem Liquid Chromatography Mass Spectrometry. All the data of these sections are summarised in Chapter 6
- …
