106,707 research outputs found
Engineering and technological solutions for sustainable development (Selected, peer reviewed papers from the 2014 International Conference on Green ,August 23-2, Applied Mechanics and Materials)
No full textInteraction between Freons and Amines: The C–H···N Weak Hydrogen Bond in Quinuclidine–Trifluoromethane
No full textThe 1:1 complex between quinuclidine and trifluoromethane
has been investigated using pulsed jet Fourier transform microwave spectroscopy. The two constituting molecules are held together through a weak C−H···N hydrogen bond, with a H···N length of 2.070(1) Å. The C3 symmetric axes of the two moieties are collinear, making the overall molecular
system a symmetric top. The HCF3 subunit is freely rotating with respect to the amine moiety. Transitions for the ground (m = 0) and for the first excited (|m| = 1) torsional states, with K up to 2, have been measured, all of them showing the 14N nuclear quadrupole hyperfine structure. The dissociation
energy of the complex has been estimated to be 10.2 kJ mol−
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
Competition between weak hydrogen bonds: C-H⋯Cl is preferred to C-H⋯F in CH2ClF-H2CO, as revealed by rotational spectroscopy
No full textWe recorded the pulsed jet Fourier transform microwave spectrum of the 1 : 1 adduct of CH2ClF with formaldehyde. Formaldehyde is linked to CH2ClF through a C-H···Cl bond rather than a weak C-H···F hydrogen bond, with a H···Cl "bond length" of 2.918 Å. Two additional equivalent C-H···O contacts, with a H···O distance of 2.821 Å, characterize the complex. Tunnelling splittings due to the internal rotation of the formaldehyde moiety have been observed, which allowed estimating the barrier to the internal rotation of formaldehyde to be 125(10) cm(-1). The (35)Cl quadrupole coupling constants have been determined to be χaa = 31.131(7) MHz and χbb-χcc = -105.82(1) MHz
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
Weak C–H⋯N and C–H⋯F hydrogen bonds and internal rotation in pyridine–CH3F
No full textThe pulsed-jet Fourier transform rotational spectra of 4 isotopologues have been recorded for the most
stable conformation of the molecular cluster pyridine–CH3F. Two weak C–H N and C–H F hydrogen
bonds link the two subunits of the complex. Structural information on the hydrogen bridges has been
obtained. The internal rotation of the CH3F subunit around its symmetry axis splits all rotational transitions
into two (A and E) well resolved component lines, leading to a V3 barrier height of 1.55(1) kJ mol-
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
Ubbelohde Effect within Weak C–H···π Hydrogen Bonds: The Rotational Spectrum of Benzene–DCF3
No full textThe Fourier transform microwave investigation of
C6H6−DCF3 outlines a shortening of the distance between the two constituent molecules of about 0.0044(2) Å upon H → D substitution of the hydrogen atom involved in the C−H···π hydrogen bond. This proves that the Ubbelohde effect takes place also within weak hydrogen bonding. The measure of the spectra of several 13C isotopologues in natural abundance has been useful to obtain structural informatio
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