117,353 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
Mechanical transvenous extraction of endocardial implantable cardioverter defibrillator leads: feasibility, safety and determinants of success in the pisa experience
No full textIntroduction: Transvenous extraction of implantable electric devices is a well known procedure, almost described and documented for pacing leads, with small series for implantable cardioverter defibrillator (ICD) leads. Aim of our study was to describe a large single center experience in implantable cardioverter defibrillator (ICD) leads extraction by transvenous mechanical technique.
Methods: Since 1997 to June 2010, 352 consecutive patients (309 men, mean age 62.1 years, range 8-92) with 378 ventricular ICD leads (mean implantation time 42.2 months, range 1-204) underwent a mechanical transvenous removal. System features included almost left side implanted systems (92%) with passive fixation (76%) and dual coil (74%) leads. The most common indication for lead extraction was local infection (174 patients, 49%), followed by sepsis (95 patients, 27%) and lead malfunction (83 patients, 24%).
Results: Removal was feasible with a complete success in all the approached leads (100%). 23 leads (6%) were removed by manual traction, 355 by mechanical dilatation, whose 321 (85%) using the venous entry site approach and 34 (9 %) by the transvenous jugular approach crossover. Mean extraction time was 21±31.7 min (range 1-210). No major complications occurred. Dual coil compared with single coil leads showed an higher rate of fibrous adherences at the innominate vein (69% vs 52%, respectively) and superior vena cava (70% vs 51 %, respectively), without differences in the other sites. Comparing the easy ("traction" group) with the complex approach ("transjugular" group), all baseline patient and leads features resulted comparable (p =NS), with the only exception for the lead implantation time that resulted statistically longer in the second group (10.4±10.3 vs 64.3±36.7 min, p<0.01, respectively).
Conclusions: Our large experience shows that transvenous ICD leads removal is a feasible, safe procedure with an high success rate. However, even if the mean dwell time is usually lower than pacing leads, manual traction is rare effective and often transjugular approach may be required
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
His-bundle pacing to treat an unusual case of chest pain after pacemaker implant
No full textA 63-year-old man with hypertension and 3-vessel coronary artery disease previously treated with coronary artery bypass graft was admitted to our emergency room complaining of chest pain. He had undergone pacemaker implant 5 months before due to paroxysmal advanced atrioventricular block. Electrocardiography and troponin testing were unremarkable. Echocardiography and chest X-ray ruled out lead displacement and perforation. Interrogation showed normal parameters [right atrium: impedance 550 Ohm bipolar, sensing 2.4 mV bipolar; threshold 0.50 V/0.4 ms bipolar; right ventricle (RV): impedance 580 Ohm bipolar, sensing > 25 mV bipolar; threshold 1.5 V/0.4 ms bipolar and 0.4 V/0.4 ms unipolar]. Pain was evoked only during RV pacing. An electrophysiology study demonstrated painful RV pacing from multiple sites. We hypothesized that pain was associated with pacing-induced dyssynchrony. His-bundle pacing (HBP) was considered as a solution. We achieved HBP with a bipolar fixed-screw catheter connected to a cardiac resynchronization therapy pacemaker generator. During HBP above threshold (4.00 V/1.00 ms) the patient did not complain of any pain. He was discharged 3 days later pain-free with His-bundle lead amplitude set at 5.00 V/1.00 ms. After 6 months the patient was asymptomatic, with the device showing normal functioning. This is the first clinical experience of painful RV pacing treated with HBP. Learning objective: Painful right ventricular pacing in the absence of perforation is a rare but potentially underdiagnosed condition. Ventricular dyssynchrony could represent the underlying mechanism. Physiological electromechanical activation achieved via His-bundle pacing could represent an effective therapeutic option
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
Descrizione e studi dell'insigne fabbrica di S. Maria del Fiore metropolitana fiorentina
No full textin varie carte intagliati da Bernardo Sansone Sgrilli architetto e dal medesimo dedicati all'Altezza Reale di Gio: Gastone I. Granduca di ToscanaGest. Titelvignette mit Wappen des Widmungsempfängers (gest. von B.S. Sgrilli nach Vorlage von G.D. Campiglia), Portr. von Giovanni Battista Nelli, ital. Architekt, 1661-1725 (gest. von V. Franceschini nach Vorlage von G.D. Ferretti), 17 Kupfertafeln (gest. von B.S. Sgrilli zumeist nach Vorlagen von G.B. Nelli, davon 16 doppelblgr., numm. Fig. I-XVII, davon Fig. VII und VIII auf 1 Taf., Fig. XIII½ auf ganzseit. Taf.), gest. Vignetten und Initialen, ZierstückeTitelbl. in Rot- und SchwarzdruckErscheinungsjahr im Impressum in römischen Ziffern vor der Verlagsangabe genannt (Vorlageform des Erscheinungsvermerks: In Firenze L'Anno MDCCXXXIII. Per Bernardo Paperini)Widmung von B.S. Sgrilli an Gian Gastone (de' Medici), Grossherzog der Toskana (1671-1737) auf dem Titelbl. und auf Bl. []₂recto-A₂verso (dort datiert: 18. Aug. 1733)Enth. auf Bl. L₂r-v zwei Lobgedichte (unterz.: "Al. Gh.") auf das Werk und den Verf. des erläuternden Textes, Girolamo Ticciati (Bildhauer und Architekt, 1676 - nach 1740), vgl. "Dedicatoria" (Bl. A₁r-v)Lose Beilage: 2 Ausschnitte aus Antiquariatskataloge
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
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