1,721,701 research outputs found
The accuracy of electronic working length determination
No full textAim To determine in vivo the accuracy of two impedance quotient apex locators under clinical conditions. Methodology Electronic working length determination was carried out before extraction in 79 human teeth with 93 root canals. In 51 root canals, the determination was performed using the apex locator Justy II(R) (Hager & Werken, Duisburg, Germany); in 42 canals, the apex locator Endy 5000(R) (Loser, Leverkusen, Germany) was used. A root canal instrument was fixed at working length with composite material prior to extraction followed by the exposure of a radiograph. After histological preparation of the apical region, the teeth were examined under a light microscope. The distance of the file tips to the target intervals 'minor foramen - major foramen' and 'apical canal constriction' was determined. These values were compared with the calculated working lengths, determined by radiographic assessment. The data were statistically analysed by a paired t-test. Results For both apex locators and both target intervals, no significant differences between the electronic and radiographical assessments were recorded. The probability of determining the area between minor and major foramen was 82.4% for Justy II and 81% for Endy 5000. However, accurate determination of the apical constriction was only successful in 51% (Justy II) and 64.3% (Endy 5000) of canals. Variation of the inaccurate measurements was higher for Endy 5000 than for Justy II. Conclusions Under clinical conditions, it is possible to determine the region between the minor and major apical foramen with electronic length measuring devices (ELD). However, use of these devices does not result in precise determination of the apical constriction
Alien Registration- Hoer, Bessie R. (Westbrook, Cumberland County)
Full text linkhttps://digitalmaine.com/alien_docs/20112/thumbnail.jp
Cletus A. Hoer
No full textCLETUS A. HOER
NBS/NIST: 1956 ‑ 1989
Birth: July 14,1933, Westphalia, Missouri
Education:
University of Colorado: ES (Engineering Physics), 1959; MS (Electrical Engineering), 1967
Principal field:
Microwave measurement techniques and standards
Positions held at NBS/NIST (Boulder)
Chief, High Frequency Impedance Standards Section, Radio Standards Engineering Division
Leader, Microwave Metrology Group, Electromagnetic Technology Division
Honors:
U.S. Department of Commerce Gold Medal, 1976
NBS Applied Research Award, 1981
Automatic RF Techniques Group (ARFTG) Automated Measurement Technology Award, 1983
ARFTG Automated Measurement Career Award, 1990
Memberships:
Institute of Electrical and Electronics Engineers
Research Society of America
Publications:
Many technical papers and patents; "A Network Analyzer Incorporating Two Six‑Port Reflectometers", IEEE Trans. Microwave Theory and Technique, vol. MTT‑25, 1070-1074, 1977; "Thru‑Reflect‑Line: An Improved Technique for Calibrating the Dual Six‑Port Automatic Network Analyzer," IEEE Trans. Microwave Theory and Technique, vol. MTT‑27, 987‑997, 1979
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Hoer of stoer? De betekenis van de bijnamen \u27hoer\u27en \u27player\u27 onder Nederlandse scholieren
No full textDe betekenis van de bijnamen
‘hoer’ en ‘player’ onder Nederlandse
scholiere
Hoer onderwys en diversiteit: \u27n oop gesprek
Full text linkSuid-Afrika staan nie alleen ten opsigce van die uitdagings wat die diversiteicsverskynsel in \u27n tyd van transformasie aan die hoer onderwys stel nie. Die groeiende omvang en verskeidenheid van vakliteratuur in hierdie studieveld dui op die wereldwye verdwyning van die homogene studentebevolking wat opvoedkundiges voor nuwe eise en geleenthede te staan bring. Hierdie arrikel betoog dac SuidAfrikaanse onderwyskundiges en leerfasiliceerders met groat vrug kan gebruik maak van navorsingsresulcace en vaardighede wac plaaslik en in die buiteland beskikbaar gescel word. Sekere intervensies is noodsaaklik om re verseker dat die onderwyskundige implikasies van diversiceit onverwyld aangespreek word, veral ten opsigte van die verwerwing van multikulturele vaardighede
Hoer onderwys en diversiteit: 'n oop gesprek
Full text linkSuid-Afrika staan nie alleen ten opsigce van die uitdagings wat die diversiteicsverskynsel in 'n tyd van transformasie aan die hoer onderwys stel nie. Die groeiende omvang en verskeidenheid van vakliteratuur in hierdie studieveld dui op die wereldwye verdwyning van die homogene studentebevolking wat opvoedkundiges voor nuwe eise en geleenthede te staan bring. Hierdie arrikel betoog dac SuidAfrikaanse onderwyskundiges en leerfasiliceerders met groat vrug kan gebruik maak van navorsingsresulcace en vaardighede wac plaaslik en in die buiteland beskikbaar gescel word. Sekere intervensies is noodsaaklik om re verseker dat die onderwyskundige implikasies van diversiceit onverwyld aangespreek word, veral ten opsigte van die verwerwing van multikulturele vaardighede
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
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