117,486 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
Oral supplementation with L-Homoarginine in young volunteers
No full textHomoarginin ist eine natürlich vorkommende Aminosäure, die man im Menschen in Konzentrationen von 2-3 µmol/l findet. Sie wird vom Körper über die Arginin-Glycin-Amidinotransferase (AGAT) produziert, kann aber auch über die Nahrung zugeführt werden. Verschiedene Studien haben gezeigt, dass niedrigere Homoarginin-Plasmakonzentrationen zu einem höheren Risiko für kardiovaskuläre Erkrankungen führen und auch deren Schwere beeinflussen können. In dieser doppelblinden, Placebo-kontrollierten, randomisierten Studie sollte daher die Möglichkeit, Homoarginin als Nahrungsergänzungsmittel einzusetzen, untersucht werden.
20 gesunde Probanden zwischen 21 und 60 Jahren nahmen für vier Wochen täglich 125 mg Homoarginin oder ein Placebo ein und wechselten nach vierwöchiger Auswaschphase auf das andere Präparat. Zuvor erfolgte außerdem eine Einzelgabe. So konnten die Plasmakonzentrationen nach Einmaldosis sowie im steady state untersucht werden. In den einzelnen Phasen fanden Blutuntersuchungen sowie Messungen der Vitalzeichen als Sicherheitsparameter statt, außerdem maßen wir den Einfluss des Homoarginins auf die Gefäßeigenschaften mittels Pulswellengeschwindigkeit (PWV), Augmentationsindex (AIx) und Flow-mediated vasodilation (FMD) sowie auf die kortikale Erregbarkeit mittels transkranieller Magnetstimulation (TMS).
Durch die einmalige Einnahme von Homoarginin erhöhte sich der Plasmaspiegel innerhalb von 1,15 ± 0,54 Stunden um durchschnittlich 8,74 ± 4,46 µmol/l. Nach der vierwöchigen Einnahme wurde eine um 17,3 ± 4,97 µmol/l erhöhte Konzentration erreicht. Hinsichtlich aller dynamischen Endpunkte der Studie, nämlich der PWV, des AIx, der FMD und des TMS ließen sich keine signifikanten Unterschiede zwischen den einzelnen Messzeitpunkten feststellen.
Die Studie lieferte dennoch zwei wesentliche Erkenntnisse, die Gabe von 125 mg Homoarginin täglich erhöht die Plasmakonzentration in gesunden Probanden und sie ist gut verträglich. Der ausbleibende Effekt in den dynamischen Endpunkten kann mit der kurzen Einnahmeperiode und auch der geringen Probandenzahl zusammenhängen; insgesamt ist aber bei gesunden Probanden wohl ohnehin nur ein geringerer Effekt zu erwarten.L-homoarginine is a naturally occurring amino acid found in humans in concentrations of 2-3 µmol/l. It is built by the arginine:glycine amidinotransferase (AGAT), but it is also possible to get it via nutrition. Multiple studies have shown that lower concentrations of L-homoarginine result in a higher risk of cardiovascular diseases and that they influence the severity of them. In this double blind, placebo-controlled and randomised study we wanted to investigate the possibility of using L-homoarginine as a dietary supplement.
20 healthy test subjects between 21 and 60 years old took 125 mg L-homoarginine or a placebo daily for four weeks. After four weeks of washout-phase they changed to the other product. In addition they took one capsule of L-homoarginine in the beginning of the study. So at the end we had the possibility to investigate the plasma concentrations after a single dose as well as in steady state. In all phases we took blood samples and measured the vital parameters as safety parameters. Furthermore we measured the influence on the vessels via pulse wave velocity (PWV), augmentation index (AIx) and flow-mediated vasodilation (FMD) as well as on the cortical excitation via transcranial magnetic stimulation (TMS).
After a single dose of L-homoarginine the plasma concentration was increased averagely by 8.74 ± 4.46 µmol/l in 1.15 ± 0.54 hours. After four weeks the plasma concentration was raised averagely on 17.3 ± 4.97 µmol/l. Concerning the dynamic endpoints, namely PWV, AIx, FMD and TMS, we did not find any significant differences between the test phases.
Nevertheless the study yielded two essential findings, a dose of 125 mg L-homoarginine daily increases the plasma concentration in healthy probands and it is well tolerated. The missing effect on the dynamic endpoints can be associated with the short period of intake and the small number of test subjects, overall a reduced effect in healthy probands can be expected anyway
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
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