117,753 research outputs found
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
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
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
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
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
Sarah L. Blum Author Visit - Warrior Nurse: PTSD and Healing
No full textHear Sarah L. Blum, author of Women Under Fire: Abuse in the Military, discuss her newest book, Warrior Nurse: PTSD and Healing followed by a Q&A and book signing.
Sarah L. Blum is a decorated Vietnam veteran who served as an operating room nurse during the intense fighting of 1967. In recognition of her service, she was awarded the Army Commendation Medal.
Sponsored by CWU Veterans Center and CWU Libraries.https://digitalcommons.cwu.edu/libraryevents/1252/thumbnail.jp
Lillian L. Lambert, Author, Speaker, and Entrepreneur
No full textLillian L. Lambert, Author, Speaker, and Entrepreneu
Letter to Alfred L. Shoemaker, February 10, 1948
No full textA handwritten letter from an unknown author addressed to Alfred L. Shoemaker, dated February 10, 1948. Within, the author discusses the Pennsylvania Dutch word for Ash Wednesday, along with traditions associated with this day.https://digitalcommons.ursinus.edu/shoemaker_documents/1118/thumbnail.jp
Differential activation of mitogen-activated protein kinases in acute, intermittent and chronic myocardial hypoxia in vivo
No full texta risk factor for cardiovascular surgery. However, the underlying molecular mechanisms
are unknown. We investigated the role of MAPKs in CH compared with
acute (AH) and intermittent (IH) hypoxia. We used a novel type of normobaric
hypoxic chamber that permits to study the animals under true CH conditions (ie,
no cage opening for feeding and animal care). In contrast, most previous stud-ies involved daily opening of cages and, hence, results actually referred to IH (ie,
prolonged hypoxia with short daily periods of reoxygenation) rather than true CH.
Methods: Adult rats were subdivided into 4 groups: normoxia (N; O2 fraction=
21%), AH (O2 fraction=10% for 1h), CH and IH (n=6/group). CH and IH
rats were housed in a normobaric hypoxic chamber (O2 fraction =10%), but IH
rats were exposed to room air for 1h/day. After 2 weeks, CH and IH hearts were
excised and homogenized for extraction of cytosolic and nuclear proteins to determine
activation (phosphorylation) of c-Jun NH2-terminal kinases (JNK), extracellular
signal-regulated kinases (ERK), and p38 MAPK byWestern blot. JNK and
p38 MAPK activities were also determined by in vitro kinase assays. Mitochondria
were isolated to determine the subcellular distribution of cytochrome C and the
anti-apoptotic factor Bcl-2. Cardiomyocyte apoptosis was determined by TUNEL.
Results: AH was associated with significant (p<0.05) activation of JNK (3.4-fold)
and p38 MAPK (3.7-fold), IH with that of JNK (2.3-fold) and ERK (1.7-fold), and
CH with that of p38 MAPK alone (3.3-fold). JNK and p38 MAPK in vitro kinase assays
were consistent with these MAPK activation patterns. Cardiomyocyte apoptosis
was increased 2.2-fold in IH and 4-fold in CH. There were no differences in
the mitochondrial release of cytochrome C as well as expression and subcellular
distribution of Bcl-2 among groups.
Conclusions: AH, IH and CH are associated with differential MAPK activation in
rat hearts in vivo. p38 MAPK activation is associated with cardiomyocyte apoptosis
in CH, whereas JNK and ERK activation may be associated with cardioprotection
in IH. Results of ongoing in vivo experiments using selective inhibitors of
JNK and p38 MAPK in the intermittent and chronic hypoxia models will also be
presented to further characterize the effects of differential MAPK activation on
cardiomyocyte apoptosis under these conditions
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