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Koleksiyondaki öğeler
- BildiriAçık Erişim2019Tracking particle near a flat surface in digital video microscopy
Yücel, Harun
Digital video microscopy (DVM) is an important tool to obtain quantitative information about underlying physics in colloidal systems. DVM, however, has the overlap problem caused by particle's diffraction pattern when the detected particles are close to contact. This overlapping problem limits the tracking methods in determining accurate particle position that reflects all interactions exerting to particles or objects in colloidal studies. The problem occurs not only between two spherical particles close to each other but also when a spherical particle is close to a rod shaped particle which have a flat surface. In this study, the simulation results on the tracking spherical particle placed near the flat surface of a rod particle in 2D digital video microscopy are reported. This work shows that the overlap problem can be resolved by using a fraction of the intensity distribution of a spherical particle which is close to a flat surface.
- MakaleAçık Erişim2022Scopus SJRQ2Pastinaca vanensis (Apiaceae), a new species from Turkey
Demir, Ibrahim; Sefali, Abdurrahman; Yapar, Yakup
Pastinaca vanensis is described as a new species from the Başkale district (Van-Turkey). Its diagnostic characteristics are discussed, and taxonomic comments are presented. P. vanensis is related to Pastinaca zozimoides but differs from this species in indumentum, petal color, and mericarp features. Data on ecology and the conservation status of the new species are also presented. A distribution map of the new and related species is provided.
- MakaleAçık Erişim2022Prospective primary school teachers' change in attitudes and anxiety profiles during their preparation program
Sarikaya, İsmail; Sökmen, Yavuz
The sensory characteristics of teachers and prospective teachers directly affect them and their teaching activities. It is important to examine in detail how the attitude and anxiety levels of prospective primary teachers towards the teaching profession change throughout the years they receive education. This study aimed to cross-sectionally and longitudinally examine whether the attitude and anxiety levels of prospective primary school teachers towards the teaching profession changed throughout their undergraduate education and determine the factors/experiences triggering this change in accordance with the qualitative data obtained. A cross-sectional study was carried out with the participation of 1085 prospective teachers. For the longitudinal study, quantitative and qualitative data were collected together from 57 prospective teachers over a period of four years. Attitude scale regarding teaching and occupational anxiety scale for prospective teachers were used for data collection. The results of both the cross-sectional and longitudinal studies showed that the attitude scores of the participants did not change in accordance with the grade level. However, it was determined that the anxiety scores of the participants decreased as the grade level increased. The results revealed that this change is statistically significant. The qualitative results revealed that internship practices and direct experiences had a great influence on this change.
AtıfOpenAlex1
İncele - MakaleYalnız künye2021Comparison of kinetics of Cr (III) ions removal from wastewater using raw and activated montmorillonite minerals
İrdemez, Şahset; Durmuş, Gül; Kul, Sinan; Torun, Fatma Ekmekyapar; Bingül, Züleyha
In this study, kinetics of the removal of Cr (III) from the waters by adsorption have been investigated using montmorillonite natural clay that was obtained from the vicinity of Narman, Erzurum in Turkey. Activation energy, thermodynamic values and adsorption kinetics were determined. In addition, the trials were repeated by subjecting to the same adsorbent activation process. The values found for these two adsorbents were compared. As a result of the experiments, the parameters affecting the adsorption kinetics were examined. It was determined that the adsorption process could be best depicted by pseudo second order reaction kinetics. Using pseudo second order reaction rate constants, ΔH° =-25.791 kJ mol-1 and ΔS° = 106.19 joule mol-1 were calculated for raw adsorbent. For the activated adsorbent, ΔH° =-18,806 kJ mol-1 and ΔS° = 79.37 joule mol-1 were calculated. That ΔG° increases as temperature increases indicates; adsorption is more spontaneous at high temperatures. Negative ΔH° values show that the reaction is exothermic. The positive values of ΔS° indicate increased randomness at the adsorbent/solution interface during the adsorption of chrome.
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İncele - MakaleAçık Erişim2020Scopus SJRQ2The effects of adding garlic (Allium sativum L.) on the volatile composition and quality properties of yogurt
Arslaner, Ayla
In this study, the effects of adding garlic (Allium sativum L.) of different origins on the volatile composition and quality properties of yogurt were investigated on day 1, 7 and 14 of storage. The addition of garlic did not cause a decrease in the total specific microorganism count (>107) in yogurt samples, and it led to a significant decrease in the yeast–mould count compared to the control. Seventy-four volatile compounds were identified in the samples, consisting of 15 carbonyl compounds, 9 aliphatic hydrocarbons, 8 acids, 3 alcohols, 6 esters, 12 sulfur-containing compounds, 12 terpenes and 9 heterocyclic compounds. Acetaldehyde, 2,3-butanedione, acetoin, hexanoic acid, tetramethylthiourea and 1,2-dihydro-2,2,4-trimethyl-quinoline were the major volatile compounds found in all yogurt samples. Although they were poor in terms of terpenes compared to the control, strong sulfurous components were detected in yogurt samples with garlic. It has been determined that the addition of garlic of different origins significantly changed the aromatic profile of the yogurt. In the sensory analyses, 1.0% domestic garlic was the sample most preferred by the panelists.
AtıfScopus18WoS17OpenAlex19İncele - Kitap BölümüYalnız künye2022Safety Aspects of Non-Thermal Processing Applications for Fruit and Vegetable Processing
Devecioglu, Dilara; Dikmetas, Dilara Nur; Oztekin, Sebahat; Karbancioglu-Guler, Funda
This chapter primarily examines the most widely applied non-thermal processes to fruits and vegetables from a food safety perspective. In addition to microbial contaminants, which cause the consumption of these food products to be risky, pesticides, toxins, and process contaminants are included in the relevant headings. It is seen that although the results vary according to the process condition and the studied product, each applied process offers significant advantages in itself. The effectiveness of cold plasma, irradiation, high hydrostatic pressure, ozone, pulsed electric field, pulsed light, supercritical carbon dioxide, and ultrasound processes is emphasized in ensuring food safety for fruits and vegetables. In addition, parameters such as quality and sensory that may be affected by the process application are also mentioned, and the potential of processes for application is explained.
- DüzeltmeAçık Erişim2020Scopus SJRQ2Correction to: Investigation of the solution for discontinuous contact problem between a functionally graded (FG) layer and homogeneous half-space (Archive of Applied Mechanics, (2020), 90, 12, (2799-2819), 10.1007/s00419-020-01750-y)
Öner, Erdal; Birinci, Ahmet
kUnfortunately, Figs. 5, 6, 8 and 10 have been processed incorrectly. Correct figures are provided in this correction article. The Original article has also been corrected.
AtıfScopus2WoS2OpenAlex2İncele - Kitap BölümüYalnız künye2019A panel causality analysis on countries attracting most tourists on the basis of carbon emissions, renewable energy, tourism revenues, and trade openness
Boz, Füsun Çelebi
- MakaleAçık Erişim2020Scopus SJRQ1Portable infrared sensing technology for phenotyping chemical traits in fresh market tomatoes
Akpolat, Hacer; Barineau, Mark; Jackson, Keith A.; Aykas, Didem P.; Rodriguez-Saona, Luis E.
Our objective was to develop predictive regression algorithms based on infrared spectroscopy to screen for selected quality traits directed at optimizing the selection capabilities of fresh market tomatoes. Fresh tomato (681) samples were harvested from multiple locations (Florida, Virginia, California and South Carolina) during the 2016 and 2018 seasons at various ripening stages. Spectra were collected by transmittance and attenuated total reflectance (ATR) either from the tomato surface or juice. Reference methods included soluble solid content, titratable acidity, sugars, organic acids, and lycopene. Partial least squares regression using surface spectra showed good correlation for lycopene and ascorbic acid (rcv>0.9) but modest correlation coefficients (rcv 0.54–0.80) for all other traits, while juice spectra gave high correlation coefficients (rcv>0.94) and excellent predictive performance (RPD range 3–10) for all quality traits except ascorbic acid (rcv>0.79). Multiple quality traits were simultaneously determined by using a single drop of sample providing fast (<1 min) measurements and minimal sample preparation based on unique spectral fingerprints.
AtıfScopus17WoS15OpenAlex19İncele - MakaleAçık Erişim2021Scopus SJRQ1‘The sequential organisation of gossip talk’
Aslan, Tugba
Gossip, in its most general sense, means talking about absent third parties with regards to their strengths and weaknesses in an evaluative or informative tone. It is a common phenomenon and has been investigated from different perspectives of research such as human sciences, behavioural psychology, anthropology and so forth. Although it is a prevalent research topic amongst researchers of various disciplines, the sequential organisation of gossip talk still keeps its authenticity in terms of real-life talk-in-action research. This study aims to provide a micro-analysis of the sequential organisation of gossip talk adopting an emic perspective. The data set consists of a collection of 90 hours of audio data collected from a retirement home in Turkey. The data are analysed using Conversation Analysis. The results of the micro-analysis of authentic gossip talk points to a systematicity in gossip talk sequences in terms of initiation, response and closing.
AtıfScopus2WoS1İncele - MakaleAçık Erişim2022Scopus SJRQ1Improvement of mechanical and transport properties of reactive powder concrete using graphene nanoplatelet and waste glass aggregate
Arslan, S.; Öksüzer, N.; Gökçe, H.S.
In this study, the use of graphene nanoplatelet (GNP) and waste glass aggregate (WGA) was investigated to improve the mechanical and transport properties of reactive powder concrete (RPC), which is an ultra-high strength concrete type. The co-addition of 0.14% GNP and 30% WGA resulted in a significant increase in the compressive strength of RPC from 192.9 to 258.9 MPa and flexural strength from 16.2 to 38.7 MPa. In the study, the most significant improvement (138.6%) was obtained for the flexural strength values of RPC. Considering the strength aspects, the relevant amounts of GNP and WGA enable production of RPC ensuring a conducted electrical charge of less than 100 Coulombs; that is, with negligible chloride ion permeability. Accordingly, the highest improvement (59.8%) after flexural strength was found for the resistance of the specimens against chloride ion penetrability. In conclusion, the findings of this study show that eco-efficient production of RPC with superior mechanical and durability characteristics can be achieved using GNP and WGA, with lower cement consumption per unit value of these studied characteristics, reaching 59%.
AtıfScopus31WoS26OpenAlex32İncele - MakaleAçık Erişim2021Scopus SJRQ2Effect of a Training Program about Noticing and Expressing Feelings on Forgiveness
Kaya, Feridun; Odacı, Hatice
This study aimed to investigate the effect of training about noticing and expressing feelings on individual tendency to forgive. The experimental and control groups in the research comprised 34 students, 18 female and 16 male with ages from 19 to 23 years (M = 21.00, SD =.65), attending Bayburt University. Data collection tools included the Heartland Forgiveness Scale and the Personal Information Form prepared by the researchers. The research was completed in accordance with a random, pre-test-post-test control group experimental model. The one-way analysis of covariance (ANCOVA) was utilized for data analysis. The results showed that the training program about noticing and expressing feelings had a significant effect on individuals’ forgiveness. In addition, the mean of the forgiveness post-test scores for individuals enrolled in the training program were found to be higher than the post-test scores for individuals who did not participate.
AtıfScopus4WoS3OpenAlex3İncele - MakaleYalnız künye2021Scopus SJRQ2Frozen image analysis of a superconducting magnetic levitation system consisting of multi-surface superconductor and Halbach array permanent magnet configuration
Cansiz, Ahmet; Reisoglu, Ahmet F.; Ozturk, Kemal; Abdioglu, Murat
Levitation strength provided by high temperature superconductors are limited for device applications. Although superconducting material properties are continuously improving, there is still strong necessity of efficient design mechanisms for the superconducting magnetic levitation systems. Studies in the last decades have shown that combining multi-surface superconductor and permanent magnet components in optimum configurations has improved the levitation forces. In this respect, Halbach arraying permanent magnets interacting with multi-surface superconductors has become one of the most utilized methods. This paper investigates frozen image modeling of the levitation and guidance forces on a particular levitation system, which consists of a permanent magnet guideway and high temperature superconductor car body. The levitation enhancement is investigated for three configurations according to force interactions between the guideway and car body. These configurations are based on the use of single permanent magnet-single superconductor, Halbach array permanent magnets-single superconductor and Halbach array permanent magnets-multi-surface superconductors. The vertical and guidance forces for the present configurations were calculated in terms of field cooling and zero field cooling conditions by using frozen image model with magnetic dipole approximation. The predicted force calculations are analyzed in terms of vertical and lateral traverses of the car body respect to guideway for particular measurement distances. The force analysis provided by frozen image model qualitatively agree with the previously obtained experimental data.
AtıfScopus8WoS9OpenAlex9İncele - MakaleAçık Erişim2021Scopus SJRQ3Cycling as transportation & COVID-19: Advantages of shared bicycles during epidemics
Saatchian, Vahid; Azimkhani, Amin; Türkmen, Mutlu; Laein, Dorri Dolatkhah
In addition to the environmental problems that have plagued human life in recent decades, the outbreak of the coronavirus epidemic has endangered people's health and adversely affected their lives in other ways. Therefore, the present study aimed to investigate the advantage of using shared bicycles (SB) during the outbreak of epidemics. For this purpose, 310 male subscribers of an SB system were examined. The research tool was a questionnaire taken from studies. The results showed that the environmental and health advantages were favourable, but the place advantage indicated a relatively unfavourable situation. The results of the structural equation model also showed that the advantages of using an SB based on the highest impact are the motivational advantage, health advantage, environmental advantage, social advantage, financial advantage and place advantage. These results can provide useful solutions for governments to reduce environmental risks and maintain health and physical activity during epidemics.
AtıfScopus8OpenAlex10İncele - MakaleAçık Erişim2021Scopus SJRQ3Application of Third-Order Schemes to Improve the Convergence of the Hardy Cross Method in Pipe Network Analysis
Niazkar, Majid; Türkkan, Gökçen Eryilmaz
In this study, twenty-two new mathematical schemes with third-order of convergence are gathered from the literature and applied to pipe network analysis. The presented methods were classified into one-step, two-step, and three-step schemes based on the number of hypothetical discharges utilized in solving pipe networks. The performances of these new methods and Hardy Cross method were compared by solving a sample pipe network considering four different scenarios (92 cases). The results show that the one-step methods improve the rate of convergence of the Hardy Cross method in 10 out of 24 cases (41%), while this improvement was found to be 39 out of 56 cases (69.64%) and 5 out of 8 cases (62.5%) for the two-step and three-step methods, respectively. This obviously indicates that the modified schemes, particularly the three-step methods, improve the performance of the original loop corrector method by taking lower number of iterations with the compensation of relatively more computational efforts.
AtıfScopus7WoS4OpenAlex7İncele - MakaleAçık Erişim2020Scopus SJRQ1Diversity and functional characteristics of lactic acid bacteria from traditional kefir grains
Purutoğlu, Kübra; İspirli, Hümeyra; Yüzer, Mustafa Onur; Serencam, Hüseyin; Dertli, Enes
Traditional kefir grains were collected from distinct parts of Turkey, and their microbial profile was determined. A wide bacterial biota was observed formed by distinct lactic acid bacteria (LAB) in which Lactococcus lactis strains appeared to be dominant. Yeast species were also identified in kefir grains. Significant levels of antifungal and antibacterial activities were monitored in kefir isolates. All tested LAB produced an exopolysaccharide (EPS) containing glucose and galactose, and some strains formed a fructan-type EPS. Importantly, low levels of antibiotic resistance were observed among the kefir isolates.
AtıfScopus37WoS32OpenAlex44İncele - MakaleAçık Erişim2020Scopus SJRQ4Analysis of shear walls for a suitable opening
Can, Ömer; Tayfur, Bilal
The main purpose of shear walls in reinforced concrete structures is to resist the lateral forces affecting the structure. However, the openings created for architectural reasons significantly change the behaviour of the shear wall and cause short column formation and sudden collapse of the structure due to the openings on them. In this study, opening shear walls were analysed analytically. Twenty-nine different frames were selected and analysed according to predetermined parameters such as frame height, frame spacing, shear wall thickness, opening/frame height ratio, concrete flexibility, modulus and moment of inertia of frame columns. In this context, a total of 5200 linear elastic analyses were performed. The analysis was carried out on seven different parameters. As a result of the analysis, it has been found that there is a non-linear relationship between the opening width and the stresses in the columns, and a nonlinear relationship is predicted that it can directly trigger short column formation.
AtıfScopus1WoS1İncele - MakaleAçık Erişim2019Scopus SJRQ2Effective reduction of graphene oxide using sulfur dioxide-containing chemical compounds
Korucu, H.; Şimşek, B.; Kocakerim, M.M.; Karakaş, I.H.
The success of the graphene oxide reduction process depends on how similar the product is to pristine graphene. Sulfur oxide, which is a significant industrial waste gas, can be used in the reduction of graphene oxide. In this study, the graphene oxide reduction process was performed by using sulfur oxide with sodium tetraborate decahydrate, l-ascorbic acid, ammonium hydroxide, sodium hydroxide, lithium hydroxide, sodium borohydride and sodium thiosulfate. The carbon-to-oxygen atomic ratio and D-to-G peak ratio of the graphene oxide, which represent the degree of reduction, were 2.64–4 and 0.78–1.80 with the use of sulfur oxide, respectively. The sulfur oxide/sodium borohydride mixture increased the carbon-to-oxygen atomic ratio of the graphene oxide to 11.73, while improving the value of the D-to-G peak ratio at 3.14. The reduced graphene oxide with the highest specific heat capacity was obtained using sodium tetraborate decahydrate, with an improvement of 74.54% compared to graphene oxide. The results show that sulfur oxide, which is harmful to the environment and human health, can be utilized in an effective reduction process, together with other reducing chemicals, to obtain an industrially valuable material, such as reduced graphene oxide.
AtıfScopus15WoS14OpenAlex15İncele - MakaleYalnız künye2022INEQUALITIES FOR (α, m1, m2)-ARITHMETIC GEOMETRICALLY CONVEX FUNCTIONS VIA BY GAMMA AND INCOMPLETE GAMMA FUNCTIONS
Kadakal, Huriye
In this study, we introduce concepts of (α, m1, m2)-arithmetic geometrically (AG) convex functions and establish some Hermite-Hadamard type inequalities of these classes of functions via gamma and incomplete gamma function.
- MakaleAçık Erişim2023Scopus SJRQ1Catecholaminergic and Cholinergic Systems Mediate Beneficial Effect of Vortioxetine on Diabetes-Induced Neuropathic Pain
Turan Yücel, Nazlı; Kandemir, Ümmühan; Üçel, Umut İrfan; Demir Özkay, Ümide; Can, Özgür Devrim
The therapeutic potential of vortioxetine on mechanical hyperalgesia/allodynia was investigated in rats with streptozotocin-induced diabetes, and its possible mechanism of action was elucidated in this study. The obtained findings demonstrated that subacute vortioxetine treatment (5 and 10 mg/kg for 2 weeks) increased the reduced paw-withdrawal thresholds of diabetic rats both in the Randall–Selitto and Dynamic plantar tests. Moreover, the falling latencies of animals did not change in the Rota-rod assessments. These results suggest that vortioxetine administration significantly improved diabetes-induced hyperalgesia and allodynia responses in the rats without affecting their motor coordination. The vortioxetine (5 mg/kg)-induced antihyperalgesic and antiallodynic effects were reversed by AMPT, yohimbine, ICI 118,551, sulpiride and atropine pre-treatments, suggesting the involvement of the catecholaminergic system, α2- and β2-adrenoceptors, D2/3 dopaminergic receptors and cholinergic muscarinic receptors in the exhibited pharmacological activity, respectively. Moreover, the data from the immunohistochemical studies indicated that the inhibition of c-Fos overexpression in dorsal horn neurons also mediates the beneficial effect of this drug. Vortioxetine induced no difference in plasma glucose levels in diabetic rats. If clinical studies confirm these findings, the concomitant beneficial effect of vortioxetine on mood disorders and its neutral activity profile on glycemic control may make it an alternative drug for the treatment of neuropathic pain.
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