01. Araştırma Çıktıları | TR-Dizin | WoS | Scopus | PubMed

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Citation - WoS: 1
Citation - Scopus: 1
About The Article Titled “a Different Scintigraphic Perspective On The Systolic Function Of The Left Ventricle-1” [“sol Ventrikül Sistolik Fonksiyonuna Sintigrafik Olarak Farklı Bir Bakış Açısı-1” Başlıklı Makale Hakkında]
(Galenos Publishing House, 2024) Taşçı, Cengiz
[No abstract available]
Acoustic Emission Response of Macro Synthetic Fibre Reinforced Concrete Beams
(Natl Inst Science Communication-Niscair, 2025) Selman, Efe; Kilic, Gokhan
Macro synthetic fibre reinforced concrete(MSFRC) has been frequently preferred owing to their adequate ductility, post cracking capacity and toughness values, being potential sustainable alternative material to steel fibre concrete. Their fracture processes and possible failure mechanisms have been simultaneously scrutinized in order to fully exploit from their advantageous structural characteristics. AE methods have accurately provided comprehensive information on the origination and development of a flaw that is located in inner sections of material. With this current study, AE technique has been selected in order to determine the crack evolution and propagation in MSFRC structures. To study the AE response of MSFRC specimens, three MSFRC specimens in the volumetric ratios 0.5%,1% and 1.5% have been prepared and tested with reference concrete specimen. Average frequency, RA(Rise time to Amplitude ratio) and Sentry function parameters have been examined during three-point bending tests for specimens. AE features which correspond to the damage occurrences have been identified and shown during load history. AE method has been found to predict adequately the damage progression of MSFRC elements and the experimental behaviours of specimens have been typically captured well.
Citation - WoS: 2
Citation - Scopus: 2
Active Particle Aggregate on Complex Bubble Surfaces
(Canadian Science Publishing, Nrc Research Press, 2018) Akguc, Gursoy B.
Recently, colloids have been shown to form complex structures on bubble surfaces on demand. With the help of a high power pulse laser shining on a thin water film, water bubbles can be formed and heat unbalance creates a convective flow, which carries colloids on the surface of these water bubbles to form aggregates. Here, active particles are studied in a similar setup and conditions are laid out to form aggregates on water bubble surfaces. The effect of motility and chirality of active particles on formation of aggregate are discussed. The simulation results obtained here will hopefully help the experimental endeavors in future.
Citation - WoS: 3
Citation - Scopus: 5
Adhesive Type's Effects on Adhesive Strength of Densified Reinforced Laminated Wood Obtained From Black Poplar (populus Nigra L.)
(North Carolina State Univ Dept Wood & Paper Sci, 2023) Yalçın, İlker; Esen, Raşit
Wood material is the most critical indoor and outdoor building element that has not changed since ancient times. Previous studies have determined that the mechanical properties of tree species with low industrial importance, such as poplar wood, can be improved when they are subjected to the densification process. In addition, it has been determined in studies that the lamination process has a positive effect on the mechanical properties of the wood material. This study aimed to assess the impact of the glue type on the bonding strength during the lamination process of the densified black poplar (Populus nigra L.) using reinforcement material. Wood materials were subjected to densification at 140 degrees C for 10 min. Then, the densified boards were laminated in 3 layers with a reinforcement element (KevlartiD (R), fiberglass, and carbon fiber) between the two wooden boards. It was determined that the best result was obtained with the combination of Akfix polyurethane resin type and carbon fiber reinforcement material (8.49 N/mm2).
Citation - WoS: 2
Citation - Scopus: 2
Adrenomedullin Has No Effect on Segmental Bone Defect Healing but Increases Bone Mineral Density in Rat Model
(AVES, 2023) Kaymakoğlu, Mehmet; Ciftci, E.; Korkusuz, P.; Ozdemir, E.; Erden, M.E.; Turhan, E.
Objective: This study aimed to investigate the effect of adrenomedullin on the healing of the segmental bone defect in a rat model. Methods: Thirty-six Wistar rats were randomly divided into 6 groups based on follow-up periods and administered a dose of adreno-medullin hormone. In each group, bilaterally, a 2-mm bone defect was created at the diaphysis of the radius. Sodium chloride solution was administered to sham groups 3 times a week for 4 and 8 weeks intraperitoneally. Adrenomedullin was administered to the study groups 3 times a week: 15 μg—4 weeks, 15 μg—8 weeks, 30 μg—4 weeks, and 30 μg—8 weeks, respectively. After euthanasia, the segmental defects were evaluated by histomorphometric [new bone area (NBA)] and microtomographic [bone volume (BV), bone surface (BS), and bone mineral density (BMD)] analyses. Results: Although the 4-and 8-week 15 μg administered study groups had higher NBA values than the other study and control groups, the histomorphometric analysis did not reveal any statistical difference between the control and study groups regarding NBA (P >.05). In microtomographic analysis, BV was higher in the 15 μg 4-week group than 30 μg 4-week group (296.9 vs. 208.5, P =.003), and BS was lower in the 30 μg 4-week group than in the 4-week control group (695.5 vs. 1334.7, P =.005), but overall, no significant difference was found between the control and study groups (P >.05). Despite these minor differences in histomorphometric and microtomographic criteria indicating new bone formation, the BMD values of the 15 μg 8-week study group showed a significant increase compared with the control group (P =.001, respectively). Conclusion: Adrenomedullin positively affected BMD at 15 μg, but this study could not show healing in the segmental defect site at different dose regimens. Further studies are needed to assess its effects on bone tissue trauma. © 2023, AVES. All rights reserved.
Citation - WoS: 1
Citation - Scopus: 1
Aesthetic and Cultural Approach To the Change in the Making Techniques of Karagoz Figures
(Istanbul Univ, Research Inst Turkology, Dept Art History, 2021) Öngen Corsini, Duygu Ebru
Karagoz developed as a unique culture in Anatolian lands. Despite many controversies about how Karagoz came into existence, there is a consensus that it emerged in the 16th century. Figures, as cultural objects, have production methods and techniques interwoven with the doctrines of the past. Today, figure-making for different purposes, inherited from the past, is present in Karagoz figure art. The aesthetic reflections, technique, and material harmony of the figures for show purposes must carry the cultural essence of Karagoz. This study examines museum collections and exhibitions, interviews with Karagoz masters, and a data analysis from an academic perspective. Considering these factors, it becomes clear that the training of masters for figure-making art is significant. Long-term training organized by institutions will contribute to this art and might be beneficial for good examples to reach the audience. Transferring the figures to future generations while preserving their cultural essence, making them in a suitable technique, and aesthetic understanding synthesized with modern techniques; will also contribute to the survival of this art.
After Istanbul Hilton: Turkey's Local-Global Dichotomy in the 1950s Interiors of Divan Hotel and Cinar Hotel
(Routledge Journals, Taylor & Francis Ltd, 2022) Atmaca, Hande; Uz, Funda; Tuna Ultav, Zeynep
This study analyzes the socio-spatial qualities of hotel interiors built in Turkey after the opening of the Istanbul Hilton Hotel in 1955. It aims to reveal the construction of the modern interior in Turkey and its effects on social life at the Divan Hotel (1956) and Cinar Hotel (1958), which were Turkey's first modern hotels built with local capital and local architects. As Turkey's first modern hotel, Istanbul Hilton was regarded as a model for subsequent tourism buildings. Cinar and Divan Hotels hotels were usually compared with the Hilton's aesthetics, and seen as reminiscent of the Hilton, particularly the outer shell and building formation. However, their interiors have been completely overlooked. This is an important omission, because, contrary to its modernist outer shell, the Istanbul Hilton Hotel interiors were designed with a contrasting orientalist approach. This study therefore investigates how this dichotomy influenced the interiors of the Divan Cinar Hotels. Drawing on the theory of transculturation by Ortiz, this study challenges the view that these hotels were mere host sites, embodying and copying modern architecture without any filtering. A complete interior atmosphere was analyzed in terms of the hotels' materiality, such as furniture and art objects, but moreover, the social meaning of the space and transformation of social habits are examined to discuss local-global dichotomies. Information for the analysis was gathered through a literature review, observations, and an analysis of images obtained from personal archives and databases. This data was supported with oral interviews with architects, interior designers, craftsmen, tourism professionals, and contemporary witnesses. The findings show that the Divan Hotel and Cinar Hotel were both spatially and socially influenced by the Istanbul Hilton Hotel. However, they also sought a modernity of their own by carefully selecting and blending western influences, both spatially and socially. Most importantly, since the Divan Cinar Hotels refrained from the image difference between the modern and connotations of the orient, these spaces can be read as interpretations of an internalized modernity.
Citation - WoS: 5
Citation - Scopus: 4
Almost Automorphic Solutions of Delayed Neutral Dynamic Systems on Hybrid Domains
(Univ Belgrade, Fac Electrical Engineering, 2016) Adıvar, Murat; Koyuncuoglu, Halis Can; Raffoul, Youssef N.
We study the existence of almost automorphic solutions of the delayed neutral dynamic system on hybrid domains that are additively periodic. We use exponential dichotomy and prove the uniqueness of projector of exponential dichotomy to obtain some limit results leading to sufficient conditions for existence of almost automorphic solutions to neutral system. Unlike the existing literature we prove our existence results without assuming boundedness of the coefficient matrices in the system. Hence, we significantly improve the results in the existing literature. Finally, we also provide an existence result for almost periodic solutions of the system.
An Altarpiece for Parishioners and Pilgrims in Heiloo
(Brill Academic Publishers, 2012) van Eck, Alexander
[Abstract Not Available]
Citation - WoS: 1
Citation - Scopus: 1
Alterations of Store-Operated Calcium Entry and Cyclopiazonic Acid-Induced Endothelium-Derived Relaxations in Aging Rat Thoracic Aorta
(Akademiai Kiado Zrt, 2016) Erac, Y.; Selli, C.; Tosun, Metiner
The purpose of our study was to investigate whether endothelium-derived relaxations induced by store depletion are altered in aging rat thoracic aorta. Vascular responses were measured in aortic segments isolated from young (2-4 month) and old (20-24 month) male Sprague-Dawley rats. In phenylephrine-contracted intact tissues, receptor-mediated and receptor-independent endothelium-derived relaxations were induced by acetylcholine (ACh) and sarcoplasmic/endoplasmic reticulum Ca2+ ATPase (SERCA) blocker cyclopiazonic acid (CPA), respectively. In addition, CPA-induced changes in intracellular calcium levels were monitored in fura-2-loaded endothelium-denuded tissues. Real-time quantitative reverse transcription polymerase chain reaction and western blot analysis were performed to determine the transient receptor potential canonical (TRPC) 4 mRNA and protein levels. Endothelial TRPC4 mRNA levels were apparently decreased in aging rats. Immunoblot analysis showed that TRPC4 protein levels significantly decreased in intact aorta from 20- to 24-month-old rats compared to that from 2- to 4-month-old rats. ACh- and CPA-induced endothelium-dependent relaxations decreased in old rat aorta without any change in direct vasodilation induced by sodium nitroprusside. Store-operated Ca2+ entry (SOCE) induced by CPA was significantly decreased, whereas sarcoplasmic reticulum Ca2+ release was unaffected in endothelium-denuded aging rat aorta. In conclusion, TRPC4 downregulation could be associated with decreased endothelium-dependent vasorelaxations. As endothelial nitric oxide synthase is activated by SOCE-induced caveolar internalization, tracking the expression levels of SERCA, ion channels, and/or associated proteins involved in SOCE would lead to the development of novel therapeutics for age-related vasospastic disorders with dysfunctional endothelium.
Citation - WoS: 1
Alternative Controller Design for Rotary Inverted Pendulum
(Univ North, 2018) Oksuz, Mehmet; Onal, Mehmet Burak; Halicioglu, Recep; Dulger, Lale Canan
The inverted pendulum has been considered a classical control problem. Two designs of inverted pendulum are planar and rotary with a nonlinear unstable system characteristic. Inverted pendulum systems are nonlinear. They can be used for testing and studying various observers and controllers. Control of a rotary inverted pendulum is studied here. This paper proposes stabilization of the rotary inverted pendulum at its upright position by using full-state controller. Full-state controllers are designed by using different damping ratios. MATLAB simulation results and the experimental results are taken for 10 degrees step for 5 seconds. The best controller is chosen for SRV02-Rotary inverted pendulum by looking at the simulation and experimental results.
Citation - WoS: 5
Citation - Scopus: 13
Among, Common and Disjoint Constraints
(Springer-Verlag Berlin, 2006) Bessiere, Christian; Hebrard, Emmanuel; Hnich, Brahim; Kiziltan, Zeynep; Walsh, Toby
AMONG, COMMON and DISJOINT are global constraints useful in modelling problems involving resources. We study a number of variations of these constraints over integer and set variables. We show how computational complexity can be used to determine whether achieving the highest level of consistency is tractable. For tractable constraints, we present a polynomial propagation algorithm and compare it to logical decompositions with respect to the amount of constraint propagation. For intractable cases, we show in many cases that a propagation algorithm can be adapted from a propagation algorithm of a similar tractable one.
Citation - Scopus: 1
Analysing Relationship Between Productivity and Knowledge Economy Data of Eu Countries (including Turkey) by Using Canonical Correlation Analysis
(Inderscience Publishers, 2012) Burmaoglu S.; Kazancoglu Y.; Kabak M.
For the last 200 years, neo-classical economies have recognised only two factors of production: labour and capital. Knowledge, productivity, education and intellectual capital were all regarded as exogenous factors that are falling outside the system. Knowledge is a part of production systems in emerging economies. Also relationship between knowledge and productivity is an important aspect either. This study aims to find a relationship between the knowledge economy and the productivity for EU countries (including Turkey) using canonical correlation analysis. In contrast to previous works, instead of using firms' data, the macroeconomic data of countries is used for the analysis. The aim of this study is to find which of the knowledge economy variables has the most significant correlation between productivity variables, and also the possibility of existence of gender-based relations is scrutinised. According to the results of the analysis, patent number, computer usage and internet access level have significantly affected productivity. On the other hand, gross domestic product per capita as a productivity variable also has significant effect on knowledge economy variables. For gender-based variables, however, no correlation has been extracted. Finally, the results are discussed in the final section and some comments about knowledge economy and productivity are made. © 2012 Inderscience Enterprises Ltd.
An Analysis Into the Persona of Knidia
(Turk Tarih Kurumu, 2009) Durna, Gül E.
[Abstract Not Available]
Citation - WoS: 1
Analysis of Cesarean Section Ratios by Robson Classification
(Springer India, 2024) Kinci, Mehmet Ferdi; Kasap, Burcu; Akın, Melike Nur; Selimoğlu, Berfin; Taştan, Leyla; Akın Gökbel, Deniz; Gökbel, İsmail; Sivaslioğlu, Ahmet Akın
Background and AimCesarean section (CS) is a delivery method, which is used to avoid the complications of vaginal delivery, maternal and neonatal morbidity, and mortality. It has become the most applied surgical procedure both in Turkiye, and globally. In 2013, Robson et al. created the Robson 10-Group Classification System (TGCS) in Ireland to evaluate and standardize CS indications more easily.Materials and MethodsThe data for this retrospective study were collected from the records of women, who gave birth between January 1, 2019 and July 31, 2022 at Mugla University Education and Research Hospital. These data were classified according to the TGCS.ResultsThere were 4889 deliveries in our clinic between the specified dates. 3177 (64.98%) of these births were CS. When the CS ratio was evaluated as a percentage, the groups with the highest ratio were, respectively, Robson groups 9, 5, 7, and 8 (100%, 99.34%, 97.56%, and 96.92%). When the CS ratio was evaluated as a percentage, the group with the lowest ratio was Robson group 3 (21.5%). When numerically evaluated in terms of the effect on the CS number, the ranking was Robson groups 5, 1, and 2, respectively (1,053, 893, and 568).ConclusionThe CS ratio of our clinic is above the mean for that of Turkiye, and the highest acceptable CS ratio according to the WHO. Since our clinic is the only university hospital in the city, all complicated pregnancies are referred to our clinic, with births also taking place there. In addition, behavior change would be appropriate both with respect to active birth management and the action required to reduce the CS ratio.
Citation - WoS: 2
Citation - Scopus: 3
An Analysis of Physical and Psychological Expectations of Earthquake Victims From Temporary Shelters: a Design Proposal
(Middle East Technical Univ, 2012) Yuksel, Belma; Hasirci, Deniz
This study analyzes physical and psychological expectations of earthquake victims from temporary shelters and presents a design proposal. Interviews were conducted with earthquake victims in the city of Kocaeli in Turkey, and needs were identified. Also, user survey results from previous studies that have been conducted after the August 17th earthquake in 1999 were used to establish the design requirements for a temporary housing unit. While lack of space and issues of crowding, noise, and hygiene were mentioned as the most important problems in temporary earthquake shelters, suggestions to improve them included consideration of psychology and privacy needs of victims. The need for a home and not just a shelter has been identified and design guidelines have been examined.
Citation - WoS: 14
Citation - Scopus: 12
Analysis of Risk Factors Affecting Mortality in Elderly Patients Operated on for Hip Fractures: a Retrospective Comparative Study
(Turkish Assoc Orthopaedics Traumatology, 2021) Biçen, Ahmet Çağdaş; Akdemir, Mehmet; Turken, Mehmet Aykut; Cekok, Kubra; Ekin, Ahmet; Turan, Ahmet Cemil
Objective: The aims of this study were (1) to investigate the effects of different demographic and perioperative modalities on mortality rates and (2) to compare mortality rates between different implants in elderly patients operated on for hip fractures. Methods: In this retrospective study, a total of 314 patients who were operated on for hip fractures were included study. Patients were then divided into four groups based in their implant types: long-stem cementless bipolar hemiarthroplasty (n = 124; 102 female, 22 male; mean age = 84.2 +/- 6.4 years), standard-stem cementless bipolar hemiarthroplasty (n = 74; 48 female, 26 male; mean age = 83.5 +/- 6.9 years), antegrade intertrochanteric nail (n = 61; 35 female, 26 male; mean age = 78.5 +/- 6.8 years), and total hip arthroplasty (n = 55; 34 female, 21 male; mean age = 72.5 +/- 4.3 years). Data including gender, age, duration from injury to surgery, American Society of Anesthesiologists (ASA) score, comorbidities, use of antiplatelet agents, Barthel Index of Activities of Daily Living, type of anesthesia, operation time, preoperative hemoglobin values, blood transfusions given, duration of hospital stay, complications, and type of fracture were recorded. Results: Overall, the mean follow-up was 36.5 (range = 0 - 107) months. The overall mortality rate was 53.2%. The median survival duration was 44.2 +/- 5 months (range = 34.3 - 54). Survival rates were found significantly different among the groups (P = 0.001). In the first three years postoperatively, the mortality rate was higher in the standard-stem bipolar hemiarthroplasty group, but in the long-term follow-up, the long-stem bipolar hemiarthroplasty group exhibited the higher mortality rates. It was observed that some parameters had statistically significant effects on the mortality rates. Male gender, higher age, lower hemoglobin values, increased number of blood transfusions, ASA scores >= 3, the existence of >= 3 comorbidities were found as main predictors of increased mortality rates. Conclusion: The results of this study have shown that age, gender, preoperative hemoglobin levels, ASA scores, and comorbidities are significant factors affecting mortality in elderly patients operated on for hip fractures. Long-stem cementless bipolar hemiarthroplasty appears to show similar rates of mortality with standard-stem cementless bipolar hemiarthroplasty.
Citation - WoS: 2
Citation - Scopus: 2
Analysis of the Quadratus Lumborum Muscle Activity on Leg Length Discrepancy: a Randomized Controlled Trial
(Ios Press, 2022) Eryigit, Sevim; Al Kafee, Abdullah; Akan, Aydin
BACKGROUND: Quadratus lumborum (QL) discrete region extensions might change depending on whether leg length discrepancy (LLD) individually has any extra erector spinae action in the lumbar spine, which can result in serious injury to the lower extremities and lumbar vertebrae. OBJECTIVE: This study aims to investigate the effect of QL muscle activity on LLD by using electromyography (EMG) signals. METHODS: The study employed a randomized controlled design. A total of 100 right-handed volunteers were included in this study. All participants were assessed manually by tape measurement for LLD. EMG signals were recorded during the resting and maximal isometric contraction positions to determine QL muscle activity. The power spectral density (PSD) methods were applied to compute EMG signals. RESULTS: In maximal isometric contraction position, comparing the short right LLD (Right side = 0.00064 +/- 0.00001, Left side = 0.00033 +/- 0.0006) and short left LLD (Right side = 0.00001 +/- 0.00008, Left side = 0.00017 +/- 0.0001), it was found that the short right LLD group had significantly increased PSD of EMG values. In resting position, the short right LLD (Right side = 0.0002 +/- 0.0073, Left side = -0.00016 +/- 0.0065) had significantly increased PSD of EMG compared to the short left LLD (Right side = 0.00004 +/- 0.0003, Left side = 0.0001 +/- 0.0008) values of the QL muscle activity. The results of both groups were also statistically significant (p < 0.05). CONCLUSIONS: The present study showed that it is possible to determine effective experimental interventions for functional LLD using EMG signal analysis of QL muscle activity on an asymptomatic normal population.
Citation - WoS: 4
Citation - Scopus: 5
Analysis of Three Mutations in Italian Strains of Sars-Cov Implications for Pathogenesis
(Karger, 2021) Benvenuto, Domenico; Benedetti, Francesca; Demir, Ayse Banu; Ciccozzi, Massimo; Zella, Davide
Background: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is an enveloped virus initially detected in Wuhan in December 2019, responsible for coronavirus disease 2019 (COVID-19), a respiratory syndrome currently affecting >220 countries around the world, with >80 million cases registered and >1.8 million deaths. Objective: As several vaccines are still being developed and 2 have been approved, it is particularly important to perform evolutionary surveillance to identify mutations potentially affecting vaccine efficacy. Methods: DynaMut server has been used to evaluate the impact of the mutation found on SARS-CoV-2 isolates available on GISAID. Results: In this article, we analyze whole genomes sequenced from Italian patients, and we report the characterization of 3 mutations, one of which presents in the spike protein. Conclusion: The mutations analyzed in this article can be useful to evaluate the evolution of SARS-CoV-2.
Citation - WoS: 4
Citation - Scopus: 4
Analysis of Transient Throughput Rates of Transfer Lines With Pull Systems
(Springer, 2012) Gokce, M. A.; Dincer, M. Cemali; Örnek, Mustafa Arslan
Transfer lines represent the basic manufacturing system of many high volume production systems. Analysis and understanding of transfer lines are of great importance to improve design and operation performance of many manufacturing systems. Majority of research on the throughput of transfer lines concentrate on the steady state results. Due to the changes in manufacturing environment and increasing importance of JIT and pull systems, many transfer lines now have to changeover to different parts' production quickly, probably most of the time, before enough time passes to reach steady state for a specific configuration. In such situations, steady state may never be reached and hence results relating to the steady state do not make sense. In these situations, one would be more interested in transient behavior of the system. In this study, we offer a novel analytical model for transient throughput analysis of transfer lines. Defining throughput as the number of units produced by a transfer line with buffers per unit time, this chapter shows how to calculate mean and variance of and interval estimates for throughput for a pull type transfer line. Derivation of distribution of transient throughput of transfer lines is presented and sample calculations are provided.