101 research outputs found
Simplified prediction equation for ultimate stress in beams prestressed with hybrid tendons
No full textThe use of unbonded tendons is getting more widespread in post-tensioning industry; especially in rehabilitation and strengthening of existing damaged concrete members. The prediction of the stress at ultimate in unbonded tendon is important in calculating the capacity of structural members. This thesis presents a simplified prediction equation for concrete beams prestressed with hybrid (a combination of bonded and unbonded) tendons. The proposed equation is based on the Generalized Incremental Analysis (GIA) which uses the trussed-beam model developed by Ozkul et al. (2008) and Nassif et al. (2003). The main objective of this research is to develop a simple, but accurate design equation for the prediction of the stress at ultimate in unbonded tendon. Most important parameters such as loading type, effective prestress of unbonded tendon, concrete strength, area of steel reinforcement and span-to-depth ratio are taken into consideration. The equation is applicable to beams prestressed with unbonded or hybrid, FRP or steel, external or internal tendons. For the validation of the proposed simplified equation, test results available in the literature (199 beams) are collected. The results show that the proposed simplified equation exhibited very good accuracy for the calculation of stress at ultimate in unbonded tendon. The simplified equation is easy to use, accurate and applicable to any material type and combination of tendons.M.S.Includes bibliographical referencesby Gonca Una
Occurrence of and Factors Associated With the Presence of Aflatoxin M1 in Breast Milk of Mothers in Fethiye, Turkey
No full textAflatoxins comprise a group of mycotoxins that are found in the environment. Exposure to aflatoxins has been reported to cause serious health problems in humans. Since aflatoxin M-1 (AFM(1)) is secreted in breast milk, the exposure of infants to this toxin is an important concern. The aim of this study was to determine the prevalence, levels of, and factors associated with the presence of AFM(1) in breast milk of mothers in Fethiye, Turkey. Breast milk samples were taken from 100 mothers who had given birth over the period of October-November 2017. The AFM(1) content of the samples was determined via enzyme-linked immunosorbent assay. The lowest limit for milk samples in the Ridascreen (R) AFM(1) commercial test kit is 5 ng/L. Because of this, AFM(1) levels below 5 ng/L in the breast milk samples were assessed as negative. Of the breast milk samples tested, 53 were positive. The average AFM(1) amount in the positive samples was 6.36 ng/L (ppt; range 5.10-8.31 ng/L). Mothers who were housewives, lived in damp, humid houses, or ate spices or dried fruits and vegetables had significantly greater prevalence of AFM(1) in their breast milk than those who were employed, did not report dampness or mold in the home, or did not eat spices or dried fruits and vegetables. AFM(1) in breast milk could be an important risk factor for infant health. Informing the public about food safety could reduce the amount of AFM(1) being transferred into breast milk via food channels.Mug. la Sitki Kocman University Research Projects Coordination Office [17/186]The author(s) disclosed receipt of the following financial support for the research and/or authorship of this article: Mug. la Sitki Kocman University Research Projects Coordination Office, project grant number 17/186
Is psychological status a determinant of speech perception outcomes in highly selected good adolescent cochlear implant users?
No full textObjective: The main purpose of this study was to assess the relationship between the speech perception skills and state-trait anxiety in cochlear implant user adolescents who were highly selected good candidates. The impact of preoperative speech perception ability on postoperative speech perception and state-trait anxiety status were also examined
Phoneme discrimination and localization performance in children with cochlear implants and contralateral auditory brainstem implants with inner ear malformations
No full textPurpose This study compares unilateral and bilateral phoneme discrimination (PD) and azimuth localization abilities in children with severe inner ear malformations and cochlear nerve deficiencies who use a cochlear implant (CI) and a contralateral auditory brainstem implant (ABI). Methods A total of 17 children between the ages of 7 and 18 years with CI and contralateral ABI were included in the study. PD and localization tests were evaluated in three conditions: CI only, ABI only, and bilateral. All subjects completed a self-report Hearing-Related Quality of Life (HRQoL) scale. Results Statistical analysis revealed that PD scores were significantly higher in the bilateral condition than in the ABI condition alone (p = 0.003). However, no significant differences were found between the CI and ABI or between the CI and bilateral conditions. Similarly, no statistically significant differences in localization performance were found between the three conditions (p > 0.05). Regression analysis identified HRQoL as a significant predictor of bilateral PD (p < 0.05), while ABI localization was a significant predictor of bilateral localization (p < 0.05). Additionally, bilateral PD was found to be a significant predictor of HRQoL (p = 0.001). Conclusion While the performance of CI alone and bilateral PD is similar, there is a significant difference between the performance of ABI alone and bilateral PD. Therefore, in cases with an ABI, bilateral stimulation should be maintained by continued use of a CI in the contralateral ear, even in the presence of severe inner ear malformation and/or cochlear nerve deficiencies. In the long term, comparable levels of PD discrimination and localization performance can be achieved by using two different modalities.Izmir Bakircay UniversityThis article is derived from the doctoral dissertation of the first author, Erva Degirmenci Uzun. The authors gratefully acknowledge the children and parents who participated in this study for their patience and cooperation and the Hacettepe University auditory implant team for their great effort during the follow-up period of the children with ABI
Correction to: Determination of growth and developmental stages in hand–wrist radiographs: Can fractal analysis in combination with artificial intelligence be used? (Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie, (2024), 10.1007/s00056-023-00510-1)
No full textFollowing the publication of the original article the authors reported that the “Author Contribution” section had been published incompletely by the publisher. Below is the complete section: M. Gonca: Conceptualization, methodology, acquisition of the data, data analysis, writing original draft preparation, reviewing, and editing; M.F. Sert: Data analysis, writing original draft preparation; D.N. Gunacar: Acquisition of the data, writing, reviewing, and editing; T.E. Kose: Acquisition of the data, supervision, writing, reviewing, and editing; B. Beser: Acquisition of the data, data collection, writing, reviewing, and editing. The original article has been corrected. We apologize for the error
Risk Factors For Hearing Loss And Results Of Newborn Hearing Screening In Rural Area
No full textObjective: This article reports the results of newborn hearing screening which has been performed between March 2009-2010 in Cizre State Hospital. The results of the first step hearing screening were discussed together with the risk factors for hearing loss. Materials and Methods: All 1840 babies that were born in Cizre State Hospital between March 2009 and March 2010 were enrolled in the study. They all underwent TEOAE (transient otoacoustic emissions) test as the first step of hearing screening. Results: Of the 1840 babies who were screened, 1441 (78.3%) passed the first test and remaining 399 (21.7%) were called again for the second test. Hundred and fourteen (6.2 %) of these babies were not brought for control. Among the latter patients 29 had various risk factors for hearing loss. 249 (13.5%) of the 285 (15.5%) babies who were re-evaluated, passed the test and remaining 36 (1.96%) were referred to the second step institutions. Conclusion: In rural areas more intensive protocols should be employed. Those babies delivered during weekends and nights should be screened before discharge and a member of the hearing screening team should be present during this time period as well. AABR (Automated Auditory Brainstem Response) and TEAOE should be done together in these high risk areas. More efficient way of follow-up of these babies is also necessary.Wo
Speech Perception and Sound Localization Skills in Inner Ear Malformations: Children With Incomplete Partition Type‐II
No full textCochlear implants: Is there any relationship between stimulation rates and adaptation?
No full textObjective: To determine the relationship between stimulation rate and adaptation in cochlear implant users
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