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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Marginal fit of 3-unit CAD-CAM zirconia frameworks fabricated using cone beam computed tomography scans: an experimental study.
No full textWhether cone beam computed tomography (CBCT) scans can be used for the fabrication of computer-aided design and computer-aided manufacturing (CAD-CAM) fixed dental prostheses (FDPs) is not known. The purpose of the present study was to compare the marginal fit of 3-unit zirconia FDPs fabricated by using CBCT or 3-dimensional (3D) laboratory scanning. Extracted second premolar and molar teeth in a maxillary typodont model were prepared. The first molar was removed and the typodont model was scanned with a laboratory or a CBCT scanner to generate two virtual 3D cast groups (3DL and CBCT). Forty four 3-unit zirconia FDPs were designed on virtual casts and milled. The vertical marginal discrepancy (VMD) was measured by ×100-magnification microscopy at seven locations on each abutment. A total of 616 measurements were made at 14 fixed locations in two groups of 22 specimens. The VMD data for 3DL and CBCT groups were statistically analyzed using the Mann-Whitney U test (α = 0.05). The mean VMDs on premolar ranged between 44 and 55 µm (median: 43-55 µm) in 3DL, and 74 and 100 µm (median: 72-93 µm) in CBCT; and on the molar, between 47 and 114 µm (median: 46-114 µm) in 3DL, and 91 and 162 µm (median: 93-156 µm) in CBCT. There was a significant difference between the gaps in 3DL and CBCT groups (p < 0.001). FDPs fabricated using 3D laboratory scanner had significantly smaller VMDs. Nevertheless, the 3-unit zirconia FDPs fabricated using CBCT scans presented promising marginal integrity
Variations on the Author
Get PDF“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
Get PDFWe 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
İki farklı kavite preparasyonu ve iki farklı adeziv ajan kullanılarak yapılan inley tutuculu posterior adeziv köprülerin çekme kuvvetine dirençlerinin in-vitro incelenmesi
Get PDFRezin-bağlı sabit bölümlü protezler uzun zamandan beri, geleneksel sabit bölümlü protezlerin yerine kullanılabilmektedir. Daha az invaziv olan bu restorasyonlar, dişhekimliği hizmetine ilk sunulduklarından bu yana birçok gelişme kaydetmiştir. Bu gelişmelere bağlı olarak da başarı oranları zaman içerisinde artış göstermiştir. Geleneksel yaklaşımlar, yerini, uygulaması daha çabuk ve basit olan yeni tekniklere bırakmış ve böylece, yeni ile eski arasındaki farkın araştırılması gerekliliği doğmuştur. Bu çalışmanın amacı, yeni kullanılmaya başlanmış bir rezin-bağlı sabit bölümlü protez yapım tekniği ile geleneksel yapım tekniği kullanılarak yapılan inley tutuculu posterior adeziv köprüleri, diş sert dokularına tutuculukları bakımından in-vitro olarak karşılaştırmak ve bu restorasyonların simantasyonunda kullanılabilecek iki farklı antibakteriyel etkili adeziv sistem uygulamasının tutuculuğa etkisini sınamaktı. Çekilmiş molar dişler kullanılarak tek diş (molar) eksikliği modeli oluşturulmuş örnekler, 4 gruba (Mod-G1, Mod-G2, Gel-G1, Gel-G2) ayrıldı (n=10). Mod-G1 ve Mod-G2 grupları, yeni kullanılmaya başlanmış modifiye inley destekli slot tipi rezin-bağlı sabit bölümlü protezleri, Gel-G1 ve Gel-G2 grupları ise geleneksel inley destekli slot tipi rezin-bağlı sabit bölümlü protezleri temsil etmekteydi. Ayrıca, Mod-G1 ve Gel-G1 grupları, simantasyon esnasında, klorheksidin-bazlı bir kavite dezenfektanıyla kombine kullanılmış 10-methacryloyloxydecyl dihydrogen phosphate içerikli sıradan bir adeziv sistemi temsil ederken, Mod-G2 ve Gel-G2 grupları, antibakteriyel özellikli, 12-methacryloyloxydodecylpyridinium bromide içerikli yeni geliştirilmiş bir adeziv sistemi temsil etmekteydi. Her bir gruba, soy olmayan metal kullanılarak köprüler hazırlandı, ve bunların tutucu kısımları, simantasyondan önce, alüminyum oksit partikülleriyle kumlama işlemine tabii tutuldu. Tüm örneklerin simantasyonunda 10-methacryloyloxydecyl dihydrogen phosphate içerikli dual-cure adeziv siman kullanıldı. Simante edilen köprüler bir hafta suda bekletildikten sonra, destek dişlerden ayrılana kadar sabit hızlı çekme kuvvetine maruz bırakıldılar. Gruplar, çekme testi sonuçları bakımından istatistiksel olarak karşılaştırıldı. Örneklerin ayrılma karakterleri ve ayrılırken destek dişlere verdikleri zarar da not edildi. Gruplar için hesaplanan ortalama çekme kuvvetine direnç değerleri; Mod-G1 için 355,71 N, Mod-G2 için 305,27 N, Gel-G1 için 466,76 N, ve Gel- G2 için 454,87 N idi. Gel-G1 ve Gel-G2 grupları için hesaplanan ortalama direnç değeri, Mod-G1 ve Mod-G2 için hesaplanandan istatistiksel olarak farklı bulundu. Örneklerin ayrılma karakteri, mensup oldukları gruptan bağımsız olarak, çoğunlukla, metal-siman sınırında adeziv olarak gerçekleşti. Ayrılma esnasında, hemen her örnekte diş harabiyeti gözlendi. Tutuculuğa etkileri karşılaştırılmaya çalışılan iki farklı kavite dezenfeksiyonu yaklaşımı arasında istatistiksel fark bulunamadı, fakat, elde edilen sonuçlar, örneklerin ayrılma karakterleri yüzünden yorumlanmaya müsait değildi. Geleneksel dizayna sahip rezin-bağlı sabit bölümlü protezler, modifiye dizayna sahip olanlara göre daha tutucu bulunmuştur. Fakat, sundukları uygulama kolaylıkları ve diş sert dokularına tutunmada gösterdikleri performanstan dolayı, modifiye inley destekli slot tipi rezin-bağlı sabit bölümlü protezlerin klinik açıdan daha yüksek tercih edilme potansiyeline sahip oldukları kanısına varılmıştır. Bu tip restorasyonların simantasyonunda, ek dezenfektan uygulaması gerektirmeyen antibakteriyel özellikli adeziv ajan kullanmanın daha avantajlı olduğuna karar verilmiştir. Anahtar Kelimeler: Rezin-bağlı sabit bölümlü protezler; İnleyler; Kavite dezenfektanları; Antibakteriyel adeziv sistemler.Resin-bonded fixed partial dentures have been an alternative for the conventional full coverage fixed partial dentures for a long time. Since, first been introduced, this minimally invasive approach had undergone a lot of changes that have improved its success rate over time. Conservative modalities have been replaced by newer, more practical ones, and this has induced the need for comparing the benefits of the new and the old methods. The purpose of this study was to test and compare in-vitro the resistance of a newly introduced modified inlay retained posterior resinbonded fixed partial dentures, and conventional inlay retained posterior resinbonded fixed partial dentures to detachment from dental hard tissue. The effect of varying the dentin adhesive system combination exhibiting antibacterial properties was also investigated. Extracted molars were used to prepare specimens of pare of teeth with a space equivalent to a molar in between. Four test groups (Mod-G1, Mod-G2, Gel-G1, Gel-G2) were prepared (n=10). Groups Mod-G1 and Mod- G2 were representing the newly introduced modified inlay retained posterior resin-bonded fixed partial denture specimens incorporating slot cavity design, whereas, Gel-G1 and Gel-G2 were representing the conventional specimens also incorporating slot cavity design. Mod-G1 and Gel-G1 were also standing for the specimens that combined a 10-methacryloyloxydecyl dihydrogen phosphate containing dentin adhesive system with a chlorhexidine-based cavity disinfectant, and groups Mod-G2 and Gel-G2 were standing for a 12- methacryloyloxydodecylpyridinium bromide containing dentin adhesive system with an antibacterial cavity cleansing effect. Castings for each group were made and their fit surfaces sandblasted with aluminum oxide powder. All castings were cemented with 10-methacryloyloxydecyl dihydrogen phosphate containing dual-cure adhesive resin cement. After being immersed for at least one week in water, specimens were subjected to permanent tensile loading until separation occurred. Specimens were examined to determine the mode of separation, and occurred tooth fracture in terms of damage seriousness was noted. Results were then statistically evaluated. Mean separation forces were: group Mod-G1=355.71 N, group Mod- G2=305.27 N, group Gel-G1=466.76 N, and group Gel-G2=454.87 N. Groups Gel-G1 and Gel-G2 had significantly higher mean separation forces than groups Mod-G1 and Mod-G2. The mode of separation, independent from any group, was associated with a high frequency of adhesive failure at the metal-resin cement interface and tooth fracture was observed nearly in all specimens. No significant difference was detected between the two antibacterial adhesive system applications tested. But, due to the mode of specimen separation, this result was out of keeping with commentary. Conventional inlay retained posterior resin-bonded fixed partial dentures were found to be more retentive than modified inlay retained posterior resin-bonded fixed partial dentures. However, the simpler application procedure and the retentive performance demonstrated by the modified inlay retained posterior resin-bonded fixed partial dentures incorporating slot cavity design, had been persuading about their higher clinically admittance potential. It has been concluded that using a dentin adhesive system incorporating an antibacterial element, rather than adhesive system combined with a separate antibacterial agent application would be more favorable. Key Words: Resin-bonded fixed partial dentures; Inlays; Cavity disinfectants; Antibacterial adhesive systems.Dicle Üniversitesi Bilimsel Araştırma Projeleri 05-DF-4
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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