30,692 research outputs found
An integrated operational system to reduce O&M cost of offshore wind farms
No full textOffshore wind is a relatively new industry and it is generally more expensive to generate electricity than many alternative renewable sources. Operation & Maintenance (O&M) makes up a significant part of the overall cost of running Offshore Wind Turbines (OWT). Since the O&M associated responsibility is shared among turbine manufacturers, wind farm operators and the offshore transmission owners, this has inevitably led to lack of information, duplication of effort and less efficiency. Big data analytics is one great technique that will drive future growth. In this paper, an integrated operational system of offshore wind farm is proposed deploying big data analytics. Firstly, the current state of the O&M of offshore wind farm and the big data analytics are introduced. Afterwards, a predictive maintenance model and a maintenance implementation model are proposed, and an integrated operational system is developed incorporating those two models in order to optimize maintenance planning and implementation. Finally, the possible contribution of such a system to a more effective O&M of offshore wind farm is discussed.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Transport Engineering and Logistic
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
The long-wavelength view of GG Tau A: rocks in the ring world
No full textWe present the first detection of GG Tau A at centimetre wavelengths, made with the Arcminute Microkelvin Imager Large Array at a frequency of 16 GHz (λ = 1.8 cm). The source is detected at >6 σrms with an integrated flux density of S16GHz = 249 ± 45 µJy. We use these new centimetre-wave data, in conjunction with additional measurements compiled from the literature, to investigate the long-wavelength tail of the dust emission from this unusual protoplanetary system. We use an MCMC-based method to determine maximum likelihood parameters for a simple parametric spectral model and consider the opacity and mass of the dust contributing to the microwave emission. We derive a dust mass of Md ~ 0.1 Msun, constrain the dimensions of the emitting region and find that the opacity index at λ > 7 mm is less than unity, implying a contribution to the dust population from grains exceeding ~4 cm in size. We suggest that this indicates coagulation within the GG Tau A system has proceeded to the point where dust grains have grown to the size of small rocks with dimensions of a few centimetres. Considering the relatively young age of the GG Tau association in combination with the low derived disc mass, we suggest that this system may provide a useful test case for rapid core accretion planet formation models
DNS of turbulent mixing layers with variable density
No full textWe present some preliminary results of direct numerical simulations of three-dimensional, temporal, plane mixing layers with variable density. The simulations are run with a parallel in-house code that solves the Navier-Stokes equations in the Low-Mach number approximation, using a novel algorithm based on an extended version of the velocity-vorticity formulation used by Kim, Moin & Moser (1987) for incompressible flows. The simulations are run with Pr=0.7 and achieve Re_lambda=90-110 during the self-similar evolution of the mixing layer. Four cases with density ratios s=1,2,4 and 8 are presented. Our results show good agreement with previous experimental and numerical studies, and allow us to characterize the scales in the temperature spectra
Stability in m-quota games
No full textThe abstracts (in two languages) can be found in the pdf file of the article.
Original author name(s) and title in Russian and Lithuanian:
О. Н. Бондарева, Устойчивость в играх с m-квотой
O. Bondareva, Stabilumas lošimuose su m-kvot
Kevin M. O\u27Connell
No full textKevin M. O’Connell is the Director of the Office of Space Commerce at the U.S. Department of Commerce. Within this position, Mr. O’Connell leads an office with responsibility as a space industry advocate within the Executive Branch of the U.S. government. Mr. O’Connell brings over 35 years of experience in the U.S. government, in research organizations, and as an entrepreneur and business leader to this position.
Mr. O’Connell has researched and written extensively on the policy, security, and global market issues related to commercialization of remote sensing. Aside from numerous articles and op-eds, he was co-author of Commercial Observation Satellites: at the Leading Edge of Global Transparency (2000). He served as the Executive Secretary and Staff Director of the NIMA Commission (1999-2000). He was a member, and later Chair, of NOAA’s federal advisory committee on remote sensing from 2002-2016.
Previously, Mr. O’Connell served as the CEO of Innovative Analytics and Training, a Washington, D.C. professional services firm focused on analysis and decision support for U.S. government and commercial clients. Among other issues, the firm focused on market trends and anticipatory/futures analysis for high-technology industries such as cyber, cloud computing, and geospatial technologies. During this time, he also served as a senior consultant to the Office of the Director of National Intelligence and as an independent advisor to the Director, National Geospatial Intelligence Agency.
Mr. O’Connell’s background also includes extensive experience in national security and intelligence matters, including assignments in the Department of Defense, Department of State, National Security Council, and the Office of the Vice President. He spent a decade conducting and managing research in these areas at the RAND Corporation, including as the first director of RAND’s Intelligence Policy Center.
Finally, Mr. O’Connell has taught a long-running course on comparative intelligence in Georgetown University’s School of Foreign Service, Security Studies Program.https://commons.erau.edu/stm-images/1119/thumbnail.jp
Mining e-mail content for author identification forensics
No full textWe describe an investigation into e-mail content mining for author identification, or authorship attribution, for the purpose of forensic investigation. We focus our discussion on the ability to discriminate between authors for the case of both aggregated e-mail topics as well as across different email topics. An extended set of e-mail document features including structural characteristics and linguistic patterns were derived and, together with a Support Vector Machine learning algorithm, were used for mining the e-mail content. Experiments using a number of e-mail documents generated by different authors on a set of topics gave promising results for both aggregated and multi-topic author categorisation
Self-archiving practice and the influence of publisher policies in the social sciences
No full textAuthors in different disciplines exhibit very different behaviours on the so-called ‘green’ road to open access, i.e. self-archiving. This study looks at the self-archiving behaviour of authors publishing in leading journals in six social science disciplines. It tests the hypothesis that authors are self-archiving according to the norms of their respective disciplines rather than following self-archiving policies of publishers, and that, as a result, they are self-archiving significant numbers of publisher PDF versions. It finds significant levels of
self-archiving, as well as significant self-archiving of
the publisher PDF version, in all the disciplines
investigated. Publishers’ self-archiving policies have
no influence on author self-archiving practice
Incidence of intraabdominal hypertension in the intensive care unit.
No full textCrit Care Med. 2005 Sep;33(9):2150; author reply 2150-3
O — Emmanuelle — Catherine M. Kobiecy trójgłos o seksie
No full textO — Emmanuelle — Catherine M. Three female voices on sex In the article the author analyses three literary texts — French erotic novels translated into Polish, which were written by women. They encompass: Pauline Reage’s Histoire d’O, Emmanuelle Arsan’s Emmanuelle, and the autobiography of Catherine Millet Sex Life of Catherine M. These novels represent three styles of talking about sex; namely, silence — d’O erotic metaphor, picturesequeness — Emmanuelle and talking directly — Catherine M. The authors named the sexual act and the parts of body connected with it drawing abundantly from the general repertoire of sexualisms and choosing consistently according to their life philosophy. Thus, they created their personal way of talking about sex. In the analysed instances sexual idiolect as “a code of an individual speaker” reveals the philosophy of life of the conspicuous, female characters.O — Emmanuelle — Catherine M. Three female voices on sex In the article the author analyses three literary texts — French erotic novels translated into Polish, which were written by women. They encompass: Pauline Reage’s Histoire d’O, Emmanuelle Arsan’s Emmanuelle, and the autobiography of Catherine Millet Sex Life of Catherine M. These novels represent three styles of talking about sex; namely, silence — d’O erotic metaphor, picturesequeness — Emmanuelle and talking directly — Catherine M. The authors named the sexual act and the parts of body connected with it drawing abundantly from the general repertoire of sexualisms and choosing consistently according to their life philosophy. Thus, they created their personal way of talking about sex. In the analysed instances sexual idiolect as “a code of an individual speaker” reveals the philosophy of life of the conspicuous, female characters
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