104,633 research outputs found
Stationary conjugation of flows for parabolic SPDEs with multiplicative noise and some applications
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A multiplicity result for hemivariational inequalities
No full textIn this paper we extend a multiplicity result of Ricceri to locally Lipschitz functionals and prove the existence of multiple solutions for a class of hemivariational inequalities
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
Physalaemus lisei Braun & Braun 1977
No full textPhysalaemus lisei Braun & Braun, 1977 We found a single call type for the species, referred to as call A. The call is composed of a single harmonic note with a long duration, slight PAM (no silence intervals between peaks) and irregular PFM. The bands have a general downward FM and a short upward FM segment at the end. Calls usually have nonlinear regimes such as deterministic chaos and subharmonics. Call A (Fig. 51 A–N and 52B). We examined 19 recordings, a total of 89 minutes, with ca. 915 calls from 50 males. Only some of these calls were measured (see Table 2). Call duration varies from 0.967 to 1.997 s. The envelope of the call is variable; durations of call rise and fall are usually short and similar in duration, with a long sustain in between; the rise and fall shapes vary from logarithmic to almost linear or exponential. The sustain is flat (Fig. 51E, F, H, I) or gradually ascending (Fig. 51C, G). Some calls have a final part with higher amplitude (Fig. 51C, G, I). Shallow and short amplitude valleys can be present, mainly at the beginning and end of the call (Fig. 51C, I). The amplitude peak is usually at the very end of the call duration. Depending on the slope of the sustain, the envelope varies from rectangular (Fig. 51E, F, H, I) to triangular (pointed left; Fig. 51C, G). More than 50 % of the call energy is concentrated in 47 % of the call duration around the amplitude peak. The call can have a slight PAM (there is no silence interval between peaks; Fig. 51E, G, H). The rate of the PAM is ca. 26 Hz, forming ca. 25 cycles throughout the call. The call has a harmonic series (Fig. 52B). The fundamental frequency is ca. 480 Hz and this band can be present with low energy or absent in audiospectrograms. Six adjacent harmonics are emphasized (first seven except the fundamental). Usually, the wave periods are regular and harmonics are clear throughout the call. However, several calls show nonlinear regimes such as subharmonics (f 0 1/2, f 0 1/3, f 0 1/4, or f 0 1/5), biphonation, and deterministic chaos (Fig. 51D, J, K, M). These phenomena can occur over the entire call. The dominant frequency varies from ca. 2330 to 2460 Hz (Fig. 51D). The dominant harmonic varies from the first to the fifth (except the second), but it is usually the fourth or fifth along the first half of the call (Fig. 52B). There is a clear shift in relative energy between the bands. Although there is no shift in the dominant frequency, higher bands get more energy towards the end of the call (Fig. 51D, L, N). Most of the call energy is between 950 and 3350 Hz (five to six harmonics). The call has a slight general downward FM (Fig. 51D, L, N). Additionally, calls have a very short and slight up-downward FM at their outset, leading to slightly arc-shaped bands in this part of the call, and a short upward FM at the end (Fig. 51L, N). The general downward FM and the initial up-downward FM result in S-shaped harmonics when considering the entire call. Some calls show clear PFM (Fig. 51L, N). Calls are usually emitted in irregular sequences, with two or three calls (Fig. 51 A–B).Published as part of Hepp, Fábio & Pombal, José P., 2020, Review of bioacoustical traits in the genus Physalaemus Fitzinger, 1826 (Anura: Leptodactylidae: Leiuperinae), pp. 1-106 in Zootaxa 4725 (1) on page 82, DOI: 10.11646/zootaxa.4725.1.1, http://zenodo.org/record/361299
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 construction of Karen Karnak: The multi-author-function
No full textThis thesis is situated within the comparatively recent developments of Web 2.0 and the emergence of interactive WikiMedia, and explores the mode of authorship within a Read/Write culture compared to that of a Read/Only tradition. The hypothesis of this study is that the role of the audience has become merged with the author, and as such, represents new functions and attributes, distinct from a more conventional concept of authorship, in which the roles of audience and author are more separate. Read/Write and participatory culture, as defined by this study, is focused on collaboration, and includes the influences of D.I.Y. culture, Open-Source practices and the production of text by multiple authors. Multi-authorship presents a re-thinking of several concepts which support the notion of the individual author, since the focus of multi-authorship is not on attribution and ownership of a finished text, but on the continued malleability of a text. Modes of multi-authorship, demonstrated in the use of the pseudonyms Alan Smithee and Karen Eliot, represent declarative authors whose names signify multiple origins, whilst concurrently indicating a distinct body of work. The function of these names form an important context to this study, since primary research involves the construction of an experimental mode of multi-authorship utilising WikiMedia technology and the interaction of thirty nine participants, who are invited to create a body of work under the collective pseudonym Karen Karnak. The data generated by this experiment is analysed using aspects of Michel Foucault's author-function to identify and determine power structures inherent in the WikiMedia context. The interplay of power structures, including concepts such as identity, ownership and the body of work, affect the resulting mode of authorship and contribute to the construction of Karen Karnak, suggesting further areas of research into the emerging multi-author
Contribution of Information and Communication Technology (ICT) in Country’S H-Index
No full textThe aim of this study is to examine the effect of Information and Communication Technology (ICT) development on country’s scientific ranking as measured by H-index. Moreover, this study applies ICT development sub-indices including ICT Use, ICT Access and ICT skill to find the distinct effect of these sub-indices on country’s H-index. To this purpose, required data for the panel of 14 Middle East countries over the period 1995 to 2009 is collected. Findings of the current study show that ICT development increases the H-index of the sample countries. The results also indicate that ICT Use and ICT Skill sub-indices positively contribute to higher H-index but the effect of ICT access on country’s H-index is not clear
Fully Turbulent Mean Velocity Profile for Purely Viscous non-Newtonian Fluids
No full textThe characteristic near wall behavior of turbulent flow of purely-viscous non-Newtonian fluids is discussed for both power-law (P.-L.) and Herschel-Bulkley (H.-B.) rheological models. A proper scaling is presented for H.-B. fluids to establish an analogy with power-law fluids with same flow index. To provide reference data for turbulent flow of non-Newtonian fluids, DNS simulations of power-law fluids are conducted in a rectangular channel for a large range of power-law indices ( = 0.5, 0.69, 0.75, 0.9, 1, 1.2). The DNS data show that the mean velocity profile in the viscous and logarithmic layers follow expressions of the form and respectively, where shows a logarithmic dependency on the flow index.Comparison with some experimental data shows the above formulation to be valid for Reynolds numbers (based on shear velocity) as high as 1000
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