107,633 research outputs found
Regioselective silane-terminated intramolecular Heck reaction with alkenyl triflates and alkenyl iodides
No full textOne of the main problems of the Heck reaction using acyclic substrates which lead to Pd intermediates with beta- and beta'-hydrogens is the lack of selectivity in the formation of the double bond as the last step of the catalytic cycle. The use of allylsilanes as the alkene moiety permits control of the elimination Step. Thus, the Pd-0-catalysed reaction of 1a-e and 2 leads exclusively to the corresponding bicyclic compounds 11a-c. In contrast, reaction of 7 yields a mixture of 12a, (E)-12b and (Z)-12b
Regioselective silane-terminated intramolecular Heck reaction with alkenyl triflates and alkenyl iodides
No full textOne of the main problems of the Heck reaction using acyclic substrates which lead to Pd intermediates with beta- and beta'-hydrogens is the lack of selectivity in the formation of the double bond as the last step of the catalytic cycle. The use of allylsilanes as the alkene moiety permits control of the elimination Step. Thus, the Pd-0-catalysed reaction of 1a-e and 2 leads exclusively to the corresponding bicyclic compounds 11a-c. In contrast, reaction of 7 yields a mixture of 12a, (E)-12b and (Z)-12b
Maternal antecedents to adolescent girls’ neural regulation of emotion
No full textCurrent research on adolescent brain development has uncovered individual differences in patterns of functional connectivity during the regulation of emotions, reflecting differences in psychological and emotional functioning. The purpose of this study was to identify possible contributors to these individual differences by investigating the role of maternal emotional resources, in the form of adult attachment and emotional awareness. Participants included 35 adolescent girls (M age = 15.51, SD = 0.37) who completed an implicit emotion regulation task (Lieberman et al., 2007) during an fMRI scan following 9th grade. Mothers reported on the quality of their adult attachment when youth were in 3rd and 4th grades and reported on their emotional awareness when youth were in 4th and 5th grades. We found that higher levels of maternal anxious attachment and lower levels of maternal emotional awareness were significantly correlated with more positive (i.e., ineffective) amygdala-right ventrolateral prefrontal cortex (rVLPFC) connectivity. Further, path analysis revealed that there was an indirect effect of maternal anxious attachment on adolescent functional connectivity through maternal emotional awareness. These results suggest that exposure to compromised maternal emotional resources in childhood may be linked to the development of ineffective neural processing of emotions, highlighting one pathway for the intergenerational transmission of disrupted emotion processing.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2020-12-01The student, Haina Modi, accepted the attached license on 2018-11-19 at 09:33.The student, Haina Modi, submitted this Thesis for approval on 2018-11-19 at 09:42.This Thesis was approved for publication on 2018-11-26 at 11:59.DSpace SAF Submission Ingestion Package generated from Vireo submission #13098 on 2019-02-07 at 14:17:36Made available in DSpace on 2019-02-07T20:35:58Z (GMT). No. of bitstreams: 2
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Previous issue date: 2018-11-26Embargo set by: Seth Robbins for item 109821
Lift date: 2021-02-07T20:36:09Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 109821
Lift date: 2021-02-07T20:39:46Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 109821
Lift date: 2021-02-07T20:44:35Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Only Restriction Lifted for Item 109821 on 2021-02-08T10:15:29Z
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
Ricerca sul tema dei modi normali nonlineari di travi rettlinee e curve.
No full textDurante la visita sono state sviluppate le linee teoriche generali di una ricerca sui modi normali nonlineari di travi rettlinee e curve. Si sono messi a punto gli aspetti teorici della modellazione ed i dettagli delle indagini sperimentali correlate.
Il Prof. Yabuno ha tenuto attività seminariali tra cui due seminari sui seguenti temi: “Motion Control of an Under-Actuated Manipulator without Feedback Control” e “Stabilization Control Method for Nonlinear Phenomena by Pendulum-Type Vibration Absorbers"
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
Topology of quantum modi¯ed moduli spaces
No full textAbstract: We prove that all SYM theories that have a quantum modi¯ed moduli spaceM de¯ned by a single constraint equation have trivial homotopy groups j(M) for j = 0; 1; 2; 3 and 4. This implies that none of these theories admit skyrmions or vortexes-a fact that had only been proved for supersymmetric QCD with Nf = Nc and Sp(2N) with 2N + 2 fundamentals- whereas those of them with a nontrivial H 5(M) admit Wess-Zumino-Witten terms in their e®ective actions. Contrary to expectations, examples of quantum modi¯ed moduli spaces with a trivial H5(M) are found in the literature
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
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