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Koleksiyondaki öğeler
- MakaleYalnız künye2017Scopus SJRQ3Enhancing the potential of employing thermosetting powder recyclates as filler in LLDPE by structural modifications
Kismet, Yilmaz; Wagner, Manfred H.
Potential of using powder coating recyclates as filler material for polyethylene compounds was investigated. Due to their strong adhesion to the metal surface during compounding at extrusion temperatures higher than 100 degrees C, the coating powder recyclates were chemically modified to facilitate its processing by extrusion and injection molding at higher temperatures. For this purpose, the coating powder recyclates were first hydrolyzed with addition of an alcohol as swelling agent. The deactivated recyclates were mixed at different ratios with the matrix polymer, a linear low-density polyethylene (LLDPE). The mixtures obtained were then compounded by extrusion and subsequently injection molded to plates to produce specimens for testing. The resulting samples were characterized mechanically by tensile, bending, and impact strength tests. In summary, the powder coatings recyclates can be processed as filler for thermoplastic material, without any adhesion problems up to 160 degrees C and 180 degrees C in the extruder and in the injection molding machine, respectively.
AtıfWoS12OpenAlex13
İncele - BildiriYalnız künye2010CONTROL OF FLOW AROUND A SQUARE PRISM BY USING SYNTHETIC JET
Akansu, Yahya Erkan; Firat, Erhan
Control of the flow around a square prism by means of synthetic jet through a single slot located on middle of upper surface of the model has been investigated experimentally for Reynolds number of 8000. Synthetic jet was implemented by using a pneumatic piston-cylinder which was driven by means of an electrical motor. The frequency and stroke of the piston were changed to obtain various values of the flow control parameters. For various excitation frequency and momentum coefficients of the synthetic jet, the mean and fluctuating pressure distributions on the square prism were measured. The velocity measurements at the slot exit and at a specific coordinate were conducted by means of constant temperature anemometer (CTA). Vortex shedding frequencies obtained by the spectral analysis of both pressure-time and velocity-time history. At a value of synthetic jet excitation frequency, vortex pairs generated at slot were perturbed the shear layer that separated from the upper leading edge of square model and disturbs it. When the synthetic jet excitation frequency closes enough to the vortex shedding frequency, the lock-in of vortex shedding frequency onto the exciting frequency was occurred. On the other hand, increasing excitation frequency of the synthetic jet causes a pressure recovery on the surface of the prism within the wake region. The efficiency of the synthetic jet is classified depending on change of the drag coefficient and vortex shedding frequency.
AtıfWoS1İncele - MakaleYalnız künye2010Scopus SJRQ3Variation in Advertisement Call Properties of the Japanese Quail
Sezer, M.; Tekelioglu, O.
The aim of this study was to investigate the amount variation in four spectral and six temporal properties of advertisement calls between and within-male Japanese quail and to establish the effect of age of sexual maturation to these properties. The first, second, third syllables and damping parts were 68.2, 74.3, 501.1 and 95.9 ms long, on average, and had peak frequencies of 1719.9, 1989.9, 2203.2 and 2352.7 Hz, respectively. There was high between individual variations in all call traits. In relation to within-male variation, there were high medians and low ranges for spectral properties while low medians and high ranges for temporal properties. Moderate positive correlations between syllable lengths and age of sexual maturation, low negative correlations between interval lengths and age of sexual maturation were observed. Repeatability of the advertisement call characteristics were hid, but estimates for spectral properties were slightly lower (0.66-0.82) than that for temporal properties (0.89-0.96). These results suggest that temporal call parameters have the potential to be used in individual identity and these traits might carry information used by females in mate choice. Spectral properties could be recognized as stable call properties that may be used in efficient transmission or species recognition.
AtıfWoS3İncele - MakaleYayıncıda açık erişim2015Scopus SJRQ4The Greek Orthodox Patriarchate of Jerusalem
Satis, Ihsan; Ceyhan, Muhammed
The oldest independent Greek Orthodox Patriarchates within the Ottoman Empire were those in Constantinople, Antioch, Alexandria and Jerusalem. Among these four patriarchates, the Greek Orthodox Patriarchate of Jerusalem continues to preserve the highest status among the Patriarchates of Jerusalem as the oldest and largest church in Palestine. The history of Patriarchate goes back to Jesus as evident from the writings of the Apostles. Eastern Roman Empire granted autonomy in the local hierarchy of eastern churches at the council of Chalcedon in 451. Thus, the Greek Patriarchate of Jerusalem was established. The Greek Patriarchate of Jerusalem always had a special kind of symbolic influence, and importance for the universal Christian imagination, chiefly as the site of holy places where the Lord taught, suffered, and ascended to Heavens again. Patriarchate, which fell under Ottomans rule in the reign of Sultan Selim, was granted many privileges and exemptions. These exemptions and concessions continued until the collapse of the State. The patriarchate, too, was a beneficiary to the changes brought about by the 1856 Reform Edict and regulations of the Greek Orthodox Patriarchate of Jerusalem were drafted in 1875. In this paper, the foundation, general structure, and the regulations of 1875 will be discussed.
- MakaleAçık Erişim2015Scopus SJRQ1A fuzzy DEMATEL method to evaluate critical operational hazards during gas freeing process in crude oil tankers
Akyuz, Emre; Celik, Erkan
Gas freeing process in crude oil tanker ships is widely recognized one of the most hazardous aspects of shipboard operations. Although the process provides practical benefits to ship by removing the explosive or poisonous gases from the cargo tanks and raising the oxygen level up to 21 percent, the consequences of failure may cause serious damage to human health, marine environment and cargo. Therefore, the crew exercise utmost care and become aware of the potential hazards in gas freeing process. In this context, this paper provides a fuzzy DEMATEL (Decision Making Trial and Evaluation Laboratory) method to evaluate critical operational hazards in gas freeing process. While the DEMATEL method enables to identify and analyse the potential hazards of gas freeing process with respect to causal effect relation diagram, fuzzy sets deal with the uncertainty in decision-making and human judgements through the DEMATEL. Thus, the hybrid approach provides smart solution for safety practitioners to prevent critical hazards in gas freeing process. The results of the research will contribute to maritime safety at sea and prevention of environment pollution as well as loss of life on-board crude oil tankers ships. (C) 2015 Elsevier Ltd. All rights reserved.
AtıfWoS181OpenAlex221İncele - MakaleYalnız künye2016Scopus SJRQ1Pulsed electric fields on phenylalanine ammonia lyase activity of tomato cell culture
Gürsul, Isil; Gueven, Alper; Grohmann, Anne; Knorr, Dietrich
Pulsed electric field (PEF), among numerous stresses, provides a large potential as an external stimulus to enhance secondary metabolite biosynthesis from plant cell cultures. PEF treatment was combined with the sub-culturing technique to increase phenylalanine ammonia lyase (PAL) activity, the key enzyme for secondary metabolite synthesis from tomato cell culture. In reference to the analysis, maximum accumulation of total phenolic (TP) compounds in the cells was determined as a function of stress reaction time (SRT). Also, PEF application increased PAL activity. PEF resulted in an increase in the porosity of the cell membrane, thus decreasing cell vitality. On the other hand, SRT decreased vitality, while increasing TP content. Sub-culturing enhanced the cell structure and improved the cell membrane permeability. PEF treatment potentially offers an alternative to other methods for increasing PAL activity in plant cell cultures. (C) 2016 Elsevier Ltd. All rights reserved.
AtıfWoS20OpenAlex27İncele - MakaleAçık Erişim2021A Scale Development Study Intended for Mathematics Teacher Candidates: Mathematical Visualization Perception Scale
Ilhan, Aziz; Tutak, Tayfun
The aim of this study is to develop a valid and reliable measurement tool that measures mathematical visualization perceptions for mathematics teacher candidates. Therefore, the type of study is a survey research. Research was carried out with 462 (336 Female, 125 Male) mathematics teacher candidates from a university located in the Eastern Anatolia region Turkey in 2018-2019 spring season. Exploratory and confirmatory factor analyzes were performed for the analysis of research data. In the process of development of Mathematical Visualization Perception Scale (MVPS); the preparation of the pool of material, testing of the validity of the scope and appearance, conducting the trial application, ensuring the construction validity, calculating the reliability and establishing the final scale were followed. As a result of the exploratory factor analysis, a valid and reliable 5-point Likert-type scale consisting of 42 items, with 6 factors [Additional Drawing (AD), Spatial Thinking (ST), Direction Concept (DC), Relation with Daily Life (RDL), Transition from Algebra to Geometry (TAG) and Transition from Geometry to Algebra (TGA)] was created. Cronbach Alpha internal stability coefficient of these factors was calculated as 0.938. The factor structure of the scale was also confirmed by confirmatory factor analysis. As a result of the findings obtained, it was suggested to the researchers who will study in the related field to evaluate mathematical visualization perceptions of mathematics teacher candidates by using related scale with different sample groups or different variables.
AtıfOpenAlex3İncele - MakaleYalnız künye2013Scopus SJRQ2Effect of Body Condition Score on Biochemical Milk Parameters having Economic Importance in Dairy Goat during the First Month of Postpartum Period
Cimen, Murat; Topcu, Hakan
The data were collected from 20 Turkish Saanen goats raised in Ismailli village of Tunceli Province during first four weeks of postpartum period. In the research, 10 goats having BCS 1 and 10 goats having BCS 2 were used. The dams in BCS 1 group had showed lower milk fat content as compared to dams in BCS 2 group until third week. The total solids and protein levels of goats did not differ between BCS 1 and BCS 2 groups during all weeks of research We found positive high correlations between total solids and protein (r=0.997; p<0.01) in BCS 1 group and BCS2 group (r=0.9998; p<0.01) Similar correlations were found for both BCS group in study. From our results, the lower BCS has negative significant influence on the milk fat synthesis for dams having low fat depots. (c) 2013 Friends Science Publishers
AtıfWoS7İncele - MakaleYalnız künye2018CUSTOMER SEGMENTATION BY USING RFM MODEL AND CLUSTERING METHODS: A CASE STUDY IN RETAIL INDUSTRY
Dogan, Onur; Ayçin, Ejder; Bulut, Zeki Atil
Companies need to understand the customers' data better in all aspects. Detecting similarities and differences among customers, predicting their behaviors, proposing better options and opportunities to customers became very important for customer-company engagement. Segmenting the customers according to their data became vital in this context. RFM (recency, frequency and monetary) values have been used for many years to identify which customers valuable for the company, which customers need promotional activities, etc. Data-mining tools and techniques widely have been used by organizations and individuals to analysis their stored data. Clustering, which one of the tasks of data mining has been used to group people, objects, etc. In this paper we propose two different clustering models to segment 700032 customers by considering their RFM values. We detected that the current customer segmentation which built by just considering customers' expense is not sufficient. Hence, models that recommended in this research are expected to provide better customer understanding, well-designed strategies, and more efficient decisions.
AtıfWoS30İncele - MakaleYalnız künye2019Scopus SJRQ1Earthquake Damage to Nonstructural Elements of Reinforced Concrete Buildings during 2011 Van Seismic Sequence
Yön, Burak; Onat, Onur; Öncü, Mehmet Emin
Infill and partition walls as nonstructural elements are generally constructed with hollow brick masonry and briquette as single or multilayered vertical walls. The seismic responses of infill walls and reinforced concrete (RC) framed buildings have been investigated with field observations after earthquakes all over the world. This study focuses on the reasons infill and partition walls failed as a result of the October 23, 2011 (Mw=7.2), and November 9, 2011 (Mw=5.7), Van earthquakes in Turkey. In this paper, in-plane, out-of-plane, and combined failure mechanisms of single and multilayered infill walls enclosed within reinforced concrete structures were investigated, and construction rules were suggested. To limit the failure of nonstructural elements enclosed within an RC frame, design and construction requirements should be included in the seismic code by adopting suitable solutions for both in-plane and out-of-plane behavior. This paper will be a reference for future studies that investigate infill wall damage. (c) 2019 American Society of Civil Engineers.
AtıfWoS51OpenAlex62İncele - MakaleAçık Erişim2022Scopus SJRQ3Iron Age and Later Periods in an Isolated Region: The Bingol-Solhan Fortress
Danismaz, Harun; Köroglu, Kemalettin
Solhan Kalesi [Solhan Fortress] lies at the western tip of the Solhan Plain from which it derives its name. The fortress site was discovered in 2019 during surveys. Drywall fortifications reinforced with bastions and foundations from various buildings inside the fortification walls have been documented at the site. Ceramics and slag found at Solhan Fortress indicate that the site may have been a tribal center in the Iron Age. However, the architectural features of the fortress, especially the fortifications with bastions, are notably different from other Iron Age sites in the region. Surface finds do not include painted or glazed ceramics from the Medieval Period. Current findings indicate Solhan Fortress to have been inhabited for a long period from the Middle Iron Age to the Medieval Period.
AtıfWoS1İncele - MakaleYalnız künye2023Scopus SJRQ3The Effects of Listening to Lullabies and Self-selected Music on Distress and Maternal Attachment in Pregnant Women: A Randomized Controlled Study
Baltaci, Nazli; Koç, Emine; Yüksekol, Ozlem Dogan; Çokyeter, Busra
Context center dot Pregnant women may experience distress as a result of physical and psychosocial changes, and this distress affects the development of maternal attachment negatively. During pregnancy care and follow-up, reducing women's pregnancy-related distress and improving maternal attachment are important. Objective center dot To compare the effects of listening to lullabies and self-selected music in reducing distress and increasing maternal attachment in pregnant women. Design center dot This study is a randomized controlled trial. It was conducted using power analysis for a type-I error rate of a = 0.05, type-II error rate of beta = 0.20, representative power of 0.64, and effect size of 0.81. Setting center dot The study took place at a secondary care hospital in a provincial center in Turkey. Participants center dot The participants were 120 pregnant women who came to the outpatient clinic for pregnancy followups between June 2021 and October 2021. Intervention center dot The participants were allocated to one of three groups, with 40 women in each. For 30 minutes every day, for two weeks, the lullaby group (LG) only listened to lullaby records at home, and the multi-music group (MG) listened to self-selected music from different records; the control group (CG) did not listen to any music. Outcome Measures center dot The Prenatal Distress Questionnaire and the Maternal Antenatal Attachment Scale were used to collect data. Results center dot Prenatal distress levels were lower in the intervention groups than in the CG (P <.01), and they were lower in the MG than in the LG (P <.05). Antenatal attachment levels were higher in the intervention groups than in the CG (P <.01), and they were higher in the LG than in the MG (P <.05). Conclusions center dot For pregnant women, listening to selfselected music was more effective in reducing distress, whereas listening to lullabies selected by the researcher was more effective in increasing attachment. ClinicalTrials.gov ID number center dot NCT05228392.
AtıfWoS6
İncele - MakaleYalnız künye2018Scopus SJRQ3SEASONALLY VARIATIONS OF ARSENIC SPECIES IN CHICKEN MEATS CONSUMED BY TURKISH PEOPLE WITH HG-AAS
Kaya, Gokce; Karaaslan, Nagihan M.; Yaman, Mehmet
The aim in this study is speciation and determination of arsenic in chicken meat matrix. For this purpose, chicken meat samples consumed commonly by Turkish people belonging to five different companies in Turkey were obtained from markets once per 15 days during 14 months. The samples were digested in microwave oven by using both nitric and hydrochloric acid. It was found that microwave digestion method can be used successfully in the speciation analysis of arsenic. The determination and speciation of As in solutions were carried out by hydride generation-atomic absorption spectrophotometry (HG-AAS). From the observed results, concentrations of As (V) were ranged between 3.0-14.0 ng g(-1) (mean 7.3 ng g(-1)) for breast tissues and 3.0-9.0 ng g(-1) (mean 5.1 ng g(-1)) for leg tissues. The concentrations of As (III) in all studied chicken tissues were found lower than the limit of detection (2 ng g(-1)).
AtıfWoS2İncele - MakaleAçık Erişim2019Comparative Micromorphological and Anatomical Investigations on the Subsection Distantes R. Bhattacharjee (Stachys L./Lamiaceae)
Açar, Mikail; Satil, Fatih
In this study; comparative anatomical and micromorphological studies were performed on the subsection Distantes of the Stachys L. genus (Lamiaceae). Also, it was determined distinctive anatomical characters for the taxa of subsection in the study. In anatomical studies, free-hand cross-sections and the paraffin embedding method was applied with the microtome. Micromorphological studies were performed in LM (Light Microscope) and SEM (Scanning Electron Microscope). In anatomical studies, besides of similarities in stem and leaf structures there were also some differences in taxa. In micromorphological studies, the trichome and nutlet characteristics were found to be useful characters on taxa and at species and subspecies level. As a result of the study, the presence of sclerenchyma like a bundle in the stem structure and the presence and types of glandular trichomes and ornamentation on the surface of nutlet, the presence of the wing and ventral structure in the nutlet were important characters that can be used to distinguish taxa. According to the numerical findings, trichome and nutlet micromorphological characters were more important than anatomical characters.
AtıfWoS11OpenAlex5TR Dizin5
İncele - MakaleYalnız künye2017Scopus SJRQ4COMPARATIVE MICROMORPHOLOGY AND ANATOMY OF CHRYSOCHAMELA (FENZL) BOISS. (CRUCIFERAE) GROWING IN TURKEY
Çakilcioglu, Ugur; Paksoy, Mehmet Y.; Babacan, Ebru Yuce; Polat, Ridvan
The micromorphological and anatomical characteristics of three species of Chrysochamela genus have been comparatively presented by using light microscopy (LM) and scanning electron microscopy (SEM). The micromorphological studies are related to the epidermal and seed surface. In anatomical studies, cross sections of the stems and leaves were examined and biometric measurement of cell and tissues were made. The stem and leaf anatomy of the genus were described. In addition, the stomatal index rate and stomatal index of these species were calculated. The leaf is dorsiventral in mesophyll-type. Except its C. noeana taxon, stellate trichomas are coincided in other taxon. Stoma can be observed on both sides of the leaf. Whereas stoma index rates of this genus were found in the range of 0.7 - 1.2, stoma types were observed as aniocytic and anomocytic. Seed surface of the genus can be found in reticulate, verrucae or in verrucaerugose types. In conclusion, the presence/absence of trichome over stem and leaves, the presence/absence of collenchyma in middle the vascular region, the seed shape, epidermal cell shape, and the characteristics of anticlinal boundaries and periclinal cell walls were found to be the important characters for identification of the Chrysochamela genus.
AtıfWoS3İncele - BildiriYalnız künye2018Geometric Methods in Deep Learning
Ünal, Inan; Yildirim, Ozal
Deep learning algorithms have recently become the most widely used machine learning approaches. Remarkable approaches have emerged in the field of machine learning studies with the use of geometric methods for deep learning. The manifold theory, which is simply regarded as the general state of an Euclidean space, has become applicable in the field of deep learning and this field has been named Geometric Deep Learning. In this study, applications of manifold theory and differential geometry to deep learning is presented.
- MakaleAçık Erişim2019The Power of Expectations in School Management: Pygmalion Effect
Gündüzalp, Seda; Özan, Mukadder Boydak
This study aims to discover the pygmalion effect, which suggests to affect a person's expectations from other people on the actions of those people, by taking the opinions of primary school teachers. In order for the study to reach its goal, triangulation technique, which is a mixed method design, has been used. A likert-type five-point scale made up of 18 items and a semi-structured interview form comprising two open-ended questions have been used to acquire data. The scale has applied to take the opinions of teachers working at the schools administered by 25 managers mastering in a postgraduate program without thesis at the Education Management Inspection Planning and Economy Department of Firat University Institute of Education Sciences. The quantitative and qualitative data acquired have been analyzed by means of statistical softwares. It has been concluded from the findings acquired from teachers' views reveal the reality and accuracy of pygmalion effect in the field of education, and show that high expectations pave the way for teachers' motivation, effort, active working, commitment as well as the growth of their enthusiasm. It is seen that high expectations will generally reveal high performance, while low expectations, due to their negative effects on employees, will cause decrease in motivation as well as unwillingness towards the job being done and therefore, a decline or stability in performance.
AtıfWoS2İncele - MakaleAçık Erişim2017Co-Author Link Prediction from Academic Databases
Burhan, Yucel; Das, Resul
Social networks: social communication platforms where individuals exhibit their attitudes and behaviors, gestures and mimics in symbolic actions in a virtual environment. Their swift development and wide usage proportion rises social networks' necessity and popularity. People communicate with each other and share some data like idea, thinking, photo, video and location. When this data is processed, very important information is obtained about the users. In this light, it is possible to make important estimates about the users. To analyze a network, the network model, properties of graph structure, criteria and metrics must be calculated first. In this study, similarity calculation between the subjects which authors studied has been done. In this application, five suitable models (Jaccard Index, Sorensen Index, Common Neighbor, L. H. Newman Index and Salton Index methods) are applied to the data set generated by randomly selected twenty writers. In order to evaluate the calculation results; the results of the similarity calculation between authors with known linkages are used as reference values. Comparisons of obtained similarity values with reference values result in new connections. These links reveal that authors can publish articles together.
AtıfWoS1OpenAlex5İncele - MakaleYayıncıda açık erişim2021Investigation on the effects of Inula viscosa L. on rainbow trout gonad cells induced by lipopolysaccharide
Küçükgül, Azime; Küçükgül, Altug; Korkmaz, Tulay Metin
Fish cells have been accepted as an alternative to in vivo assay for inflammatory effects of therapeutic experimental systems. To reveal the anti-inflammatory effects of Inula viscosa (IV) fish cell line RTG-2, derived from the gonadal tissue of rainbow trout, was infected with lipopolysaccharide (LPS). Effective concentrations for different concentrations of LPS (1, 5, 10, 20 mu M) and IN (1, 5, 10, 20 mu g ml(-1)) were determined. While the 20 mu M concentration of LPS, which was effectively selected from preliminary tests, caused 27% cell loss, the effective 1 mu g ml-1 concentration of IN caused 1.1% proliferation in the cells when compared to the control group. All pro-inflammatory parameters investigated in LPS-induced RTG-2 cells showed up-regulation, with the highest increase in TNF-alpha gene expression level (11.3 fold changes). Down-regulation was determined in the IN together with LPS administered group and IL-1 beta had the highest effect with 96%. IL-6 protein level decreased by LPS at a rate of 4% and IN together with LPS increased by 9%. The IN exhibited significant efficacy against inflammation caused by LPS. However, further studies are needed to determine pharmacological activity of I. viscosa in details.
- MakaleYalnız künye2026Scopus SJRQ1Influence on the thermoelectric characteristics of the growth parameters of BiSeTe thin films
Yüzüak, G. Durak; Yüzüak, E.
This study systematically investigates the influence of magnetron sputtering parameters on the structural, electronic, and thermoelectric properties of 100 nm thick Bi2SexTe3-x thin films deposited on Si(100). The initial parameters for applied film deposition are used to set the x value. The films are fabricated with sputtering powers ranging from 30 to 100 W and pressures from 3 to 15 mTorr, with films grown under optimal conditions selected for post-deposition annealing at 523 K. A comprehensive characterization suite, including X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM), is used to establish direct correlations between processing, structure, and performance. XRD analysis reveals that increasing the sputtering pressure from 3 to 15 mTorr was critical for enhancing film crystallinity and promoting a strong (015) preferred orientation, while AFM showed a corresponding increase in average grain size from similar to 46 to similar to 60 nm via heat treatment (HT). EDS shows that films grown at 10 mTorr were almost certainly stoichiometric, but increasing the power to 15 mTorr caused tellurium deficiency. The films exhibited a power factor ranging from 2.5 to 2.8 mW m(- 1) K- 2 at 40 degrees C. HT improved the Seebeck coefficient from -115 mu V K- 1 to -140 mu V K- 1 and decreased the electrical resistivity by over 25 % through defect reduction and enhanced crystalline order. KPFM supported these findings, directly linking the crystallographic texture to the surface electronic structure and enhanced Seebeck effect.
AtıfWoS2OpenAlex2İncele
