178,349 research outputs found
A new spiral dental implant: a tool for oral rehabilitation of difficult cases
No full textSpiral dental implant (SDI) is an implant with a conical internal helix that confers the characteristic of self-drilling, self-tapping, and self-bone condensing. These proprieties offer better control during insertion of SDI giving a high primary stabilization, even in poor quality bone. A shorter diameter of SDI results in reduced drilling during insertion and consequently less trauma and minimal bone loss. To address the research purpose, the investigators designed a retrospective cohort study. The study population was composed of 25 patients, 11 males and 14 females that have been treated by Dr. Balan with 187 SDI positioned in mandible and into maxilla bone. The implants were placed during the years 2013 to 2014 in Dr. Balan clinic. All patients underwent the same surgical protocol. Several variables are investigated: demographic (age and gender), anatomic (upper/lower jaws and tooth site), implant (length and diameter and type) variables, edentulism (partial or total), and comorbid status of health (i.e.: hypothyroidism, parodontitis, hypertension, diabetes, presence of cancer, heart disease, hepatitis and rheumatologic disease). Pearson Chi-Square test was used to investigate variables and p < 0.05 was considered statistically significant. Statistically it has been shown that females have a higher possibility of unsuccessful respect of male, with a "p value" of 0.014. Another important impact factor for success of implant insertion has been represented by concomitants pathologies: cancer represents the most negative high factor risk with a percentage of unsuccessful of 50%, followed by heart disease (15%), and diabetes (3.7%). SDIs are reliable tools for difficult cases of oral rehabilitation. They have a higher success and survival rate, which means stable results over time. No differences were detected among SDI lengths, implant/crown ratio. In addition, the insertion of SDIs in banked bone can be performed without adverse effects. Finally, flapless and computer tomography-planned surgery does not significantly increase the clinical outcome of SDIs in complex rehabilitation. Cancer represents the most important variable to consider when a patient wants to do oral rehabilitation because of its high risk of unsuccessful.Spiral dental implant (SDI) is an implant with a conical internal helix that confers the characteristic of self-drilling, self-tapping, and self-bone condensing. These proprieties offer better control during insertion of SDI giving a high primary stabilization, even in poor quality bone. A shorter diameter of SDI results in reduced drilling during insertion and consequently less trauma and minimal bone loss. To address the research purpose, the investigators designed a retrospective cohort study. The study population was composed of 25 patients, 11 males and 14 females that have been treated by Dr. Balan with 187 SDI positioned in mandible and into maxilla bone. The implants were placed during the years 2013 to 2014 in Dr. Balan clinic. All patients underwent the same surgical protocol. Several variables are investigated: demographic (age and gender), anatomic (upper/lower jaws and tooth site), implant (length and diameter and type) variables, edentulism (partial or total), and comorbi..
Zercon sklari Balan
No full textZercon sklari Balan Zercon sklari Balan, 1992: 26. Zercon sklari.— Karaca & Urhan, 2014: 148. Materials examined. 1 female, soil and litter samples under pine trees (Pinus sp.) and oak trees (Quercus sp.), 41 ° 44 ' N, 27 ° 19 ' E, 370 m, vicinity of Yundalan village Dam, Centre of Kırklareli province, March 2014; 12 females and 5 males, soil, litter and moss samples under oak trees (Quercus sp.), 41 ° 29 ' N, 27 ° 12 ' E, 133 m, vicinity of centre of district, Babaeski district (Kırklareli province), April 2014. Female. Mean length of idiosoma 387 (372–401), mean width 294 (277–309) (n = 10). Dorsum. Twenty pairs of setae present on podonotum: j-row with six pairs, z-row with two pairs, s-row with six pairs and r-row with six pairs. Seta j 1 long and finely barbed, remaining setae on podonotum smooth and needle-like. Twenty pairs of setae present on opisthonotum: J-row with six pairs, Z-row with five pairs, S-row with two pairs and R-row with seven pairs. Setae J 1 –J 3, Z 1 –Z 2, S 1 –S 2 and R 1 –R 7 smooth and needle-like. Seta J 4 finely barbed, J 5 and Z 3 apically pilose, J 6 and Z 4 brush-like and finely barbed, all with hyaline ending. Seta Z 5 short and finely barbed. Except seta J 6, no setae reach beyond opisthonotum. Setae S 3 and S 4 absent. Podonotum covered with irregular tile-like pattern. Anterolateral parts covered with tile-like pattern, anteromedial parts covered with finely punctate pattern as opisthonotum. Dorsal cavities distinct, equal in size, axes parallel to that of the body. Pores. Pore po 1 located on line connecting setae j 2 –s 1, po 2 located on line connecting setae j 5 –s 4 (closer to seta s 4), po 3 inside a line connecting s 5 –s 6. Pore Po 1 above the base of seta Z 1, Po 2 located on line connecting setae Z 1 –S 2 (closer to seta S 2), Po 3 located on line connecting setae J 5 –Z 3 and Po 4 below the base of seta Z 4. Venter. Shapes of ventral shields and peritremes, and chaetotaxy are typical for genus Zercon. Two pairs of setae present on ventral side of podonotum. Setae p 1 short, smooth and needle-like, p 2 long, finely plumose, feather-like with hyaline ending. Peritremes slightly bent. Lateral ends of peritremal shield reaching to seta R 1. Adgenital shields present (with two opening valves). Ventrianal shield with nine pairs of setae. Anterior margin of ventrianal shield with four setae and unpaired postanal seta, all short, smooth and needle-like. Male. Mean length of idiosoma 324 (312–334), mean width 233 (227–239) (n = 5). Dorsal idiosoma, ventral idiosoma, shape of setae on idiosoma, sculpture of podonotum and opisthonotum, size and appearance of dorsal cavities, basically similar to those of female. Distribution. Ukraine (Balan, 1992) and Turkey (Karaca & Urhan, 2014). Remarks. Average lengths of opisthonotal setae and distances between setae within longitudinal rows of females and males specimens: see Table 8. Only a single male specimen of this species was recorded from Edirne province previously. We now record and describe female specimens from Turkey for the first time.Published as part of Karaca, Mehmet & Urhan, Raşit, 2016, Five new species of Zercon C. L. Koch, 1836 (Acari: Zerconidae) from northwestern Turkey, pp. 31-59 in Zootaxa 4127 (1) on page 47, DOI: 10.11646/zootaxa.4127.1.2, http://zenodo.org/record/27176
Mixozercon heterosetosus Balan 1995
No full text<i>Mixozercon heterosetosus</i> Balan, 1995 <p> <i>Mixozercon heterosetosus</i> Balan, 1995: 76; Mašán & Fenďa, 2004: 56.</p> <p> <b>Diagnosis.</b> Central and submarginal setae of podonotum smooth, except j1. Setae J1-J4 and Z1-Z2 short, smooth, other J-, Z- and S-setae elongate, brush-like, plumose. R- setae uniform in length, R1 pilose, others smooth and thorn-like. Setae J5 situated in front of dorsal cavities. None of the setae on the dorsal shield reaching the bases of the following seta. Setae S1 situated posterolaterally to Z1. Pores Po2 situated on a line connecting Z2 and S2. Podonotum and opisthonotum without sculpturing pattern. Dorsal cavities wellsclerotised, saddle-like, with undulate anterior margin.</p> <p> <b>Distribution.</b> Ukraine.</p>Published as part of <i>Díaz-Aguilar, Irma & Ujvári, Zsolt, 2010, New zerconid mites (Acari: Mesostigmata: Zerconidae) from Canada, with a review of the genus Mixozercon Halašková, 1963, pp. 1-29 in Zootaxa 2555</i> on page 3, DOI: <a href="http://zenodo.org/record/196913">10.5281/zenodo.196913</a>
LA TERRA SIGILLATA ORIENTALE A E B DALLE INDAGINI PRESSO LA SPONDA EST DEL PORTO DI AQUILEIA: ANALISI CRONO-TIPOLOGICA, REPERTI E CONTESTI DI PROVENIENZA
No full textThis study examines the Eastern Sigillata ceramics from ex Fondo Sandrigo, located along the eastern bank of Aquileia’s river port. Excavations (2010–2024) have revealed a long occupation sequence (1st century BCE–7th century CE) and ten chronological phases documenting the site's transformation. Research results presented below aim to enrich the corpus of fine Eastern ceramics in Aquileia. The presence of Eastern Sigillata A and B, despite the competitive local and Italic sigillata production, highlights Aquileia's role in long-distance trade networks. The quantitative and typological analysis identifies 40 specimens, 65% belonging to Eastern Sigillata A and 35% to Eastern Sigillata B. These findings contribute to the understanding of patterns of ceramic circulation connecting the Eastern Mediterranean to northern Adriatic. The study enhances knowledge of Aquileia’s commercial dynamics through an integrated archaeological approach
A lower bound for the Balan--Jiang matrix problem
No full textWe prove the existence of a positive semidefinite matrix such that any decomposition into rank-1 matrices has to have factors
with a large norm, more precisely where is
independent of . This provides a lower bound for the Balan--Jiang matrix
problem. The construction is probabilistic
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
Q-Markov random probability measures and their posterior distributions. Stochastic Process
No full textAbstract In this paper, we use the Markov property introduced in Balan and Ivanoff (2002) for set-indexed processes and we prove that a Markov prior distribution leads to a Markov posterior distribution. In particular, by proving that a neutral to the right prior distribution leads to a neutral to the right posterior distribution, we extend a fundamental result o
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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
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