1,721,516 research outputs found
Energy Technology and workers' control. A critical assessment of the self -management movement in United States
No full textNichols David A. Energy Technology and workers' control. A critical assessment of the self -management movement in United States. In: Autogestion et socialisme : études, débats, documents, N°41-42, 1978. Recherches sur l’autogestion, autogestion de la recherche ? pp. 167-179
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Modern Colonialism in Antactica: the coldest battle of the Cold War
No full textAntarctica was the last continent to be colonised, and Antarctic colonisation continues into the Twenty-first Century. Today, thousands of people live and work there at numerous national bases. This paper is part of an ongoing study of the colonial settlement of Antarctica, focusing on bases established by Australia, New Zealand, the United States and the Soviet Union. It examines the historical development of the built form of Antarctic stations and the planning ideas which have shaped them, against a broader backdrop of geopolitical objectives.\ud
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The performance of scientific activities and the establishment of permanently-staffed facilities were always means to display and justify national interests in Antarctica. By the 1950s, many nations were actively pursuing and contesting territorial claims on the continent. Knowledge about its valuable natural resources was growing. The 1959 Antarctic Treaty was signed to forestall both the enforcement of national rights and economic exploitation. Antarctica was set aside for wildlife and for scientific research. Nonetheless, in the climate of escalating tension between the world’s superpowers, Antarctica remained a battleground of national prowess, both scientific and political. The U.S. and U.S.S.R. invested millions in efforts to explore, utilise and tactically dominate the continent. Military resources were mobilised, and nuclear power was brought to the world’s most pristine environment. At the same time as both countries competed to conquer outer space and the Moon, ostensibly in the name of science and for the benefit of all humanity, they also sought to explore and dominate the equally-difficult south polar region. This battle for supremacy between the cold-war superpowers was primarily played out in the eastern hemisphere of Antarctica, particularly the 42% of the continent that is claimed by Australia, and the large adjacent sector claimed by New Zealand. These two nations, themselves former colonies, sought to further develop their own territorial ambitions in Antarctica by developing bases there. These ambitions could either be aided by the superpowers or eclipsed by them.\ud
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Today, the four nations under study have ten permanently-staffed research stations in Antarctica. This paper examines in detail three examples of scientific colonies: Mawson, McMurdo and Mirnyy. The paper compares the planning approaches of nations serving distinctly different imperial agendas. It does so in part by reference to other colonial, territorial and scientific initiatives pursued by these nations within their own national borders, in particular science cities in the U.S.S.R
Higher memory effects and the post-Newtonian calculation of their gravitational-wave signals
No full textA new hierarchy of lasting gravitational-wave effects (the higher memory effects) was recently identified in asymptotically flat spacetimes, with the better-known displacement, spin, and center-of-mass memory effects included as the lowest two orders in the set of these effects. These gravitational-wave observables are determined by a set of temporal moments of the news tensor, which describes gravitational radiation from an isolated source. The moments of the news can be expressed in terms of changes in charge-like expressions and integrals over retarded time of flux-like terms, some of which vanish in the absence of radiation. In this paper, we compute expressions for the flux-like contributions to the moments of the news in terms of a set of multipoles that characterize the gravitational-wave strain. We also identify a part of the strain that gives rise to these moments of the news. In the context of post-Newtonian theory, we show that the strain related to the moments of the news is responsible for the many nonlinear, instantaneous terms and 'memory' terms that appear in the post-Newtonian expressions for the radiative multipole moments of the strain. We also apply our results to compute the leading post-Newtonian expressions for the moments of the news and the corresponding strains that are generated during the inspiral of compact binary sources. These results provide a new viewpoint on the waveforms computed from the multipolar post-Minkowski formalism, and they could be used to assess the detection prospects of this new class of higher memory effects
Secondary accretion of dark matter in intermediate mass-ratio inspirals: Dark-matter dynamics and gravitational-wave phase
Full text linkWhen particle dark matter is bound gravitationally around a massive black
hole in sufficiently high densities, the dark matter will affect the rate of
inspiral of a secondary compact object that forms a binary with the massive
black hole. In this paper, we revisit previous estimates of the impact of
dark-matter accretion by black-hole secondaries on the emitted gravitational
waves. We identify a region of parameter space of binaries for which estimates
of the accretion were too large (specifically, because the dark-matter
distribution was assumed to be unchanging throughout the process, and the
secondary black hole accreted more mass in dark matter than that enclosed
within the orbit of the secondary). To restore consistency in these scenarios,
we propose and implement a method to remove dark-matter particles from the
distribution function when they are accreted by the secondary. This new
feedback procedure then satisfies mass conservation, and when evolved with
physically reasonable initial data, the mass accreted by the secondary no
longer exceeds the mass enclosed within its orbital radius. Comparing the
simulations with accretion feedback to those without this feedback, including
feedback leads to a smaller gravitational-wave dephasing from binaries in which
only the effects of dynamical friction are being modeled. Nevertheless, the
dephasing can be hundreds to almost a thousand gravitational-wave cycles, an
amount that should allow the effects of accretion to be inferred from
gravitational-wave measurements of these systems.Comment: 24 pages, 6 figures; v2: fixed typos, matches version published in
PR
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
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