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Koleksiyondaki öğeler
- MakaleAçık Erişim2025Scopus SJRQ3The Effect of a Foot Bath on Sleep Quality in the Elderly: A Single-Blind Randomized Controlled Trial; [Ayak Banyosunun Yaşlılarda Uyku Kalitesi Üzerine Etkisi: Tek Kör Randomize Kontrollü Bir Çalışma]
Demirağ, Hatice; Cin, Aynur; Hintistan, Sevilay
Objective: This study was conducted as a single-blind, randomized controlled parallel-group study with 50 elderly individuals to investigate the effect of foot bath on sleep quality. Methods: The data were collected using the “Elderly Information Form” and the “Pittsburgh Sleep Quality Index (PSQI)” between 1 May 2022-1 July 2022 at a State Hospital in Gümüşhane province. The elderly in the foot bath group were given a foot bath with 41-42°C water for 20 minutes 50 minutes before normal sleep hours. No application was made to the control group except for the administration of data collection tools. The data were analyzed with Chi-square, Friedman, Wilcoxon Sign, and Mann-Whitney U tests. Results: It was determined that at least one of the total PSQI measurements and median scores of all subcomponents obtained from the elderly in the foot bath group differed depending on time (P<.05). However, it was found that there was no statistically significant difference in the sleep latency (B2), sleep duration (B3), habitual sleep efficiency (B4) and sleep disturbance (B5) component measurements obtained from the elderly in the control group depending on time (P>.05). Again, All PSQI subcomponents and total PSQI scores, except for the subcomponent “Habitual Sleep Efficiency (C4)”, decreased throughout the application in the elderly in the foot bath group. Conclusion: As a result, a foot bath improved sleep quality in the elderly. In line with the findings from this study, it is recommended to compare the foot bath with multiple experimental groups for a longer period of time.
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İncele - MakaleAçık Erişim2025Scopus SJRQ2Disease Burden and Sexual Life in Patients With Multiple Sclerosis: A Phenomenological Study
Çakmak, Seher; Uzun, Sevda; Demir Çam, Sevgi
This study aims to examine the burden of disease experienced by multiple sclerosis patients and to deeply examine the impact of the disease on sexual life. A phenomenological research design was used in this study. This qualitative research was conducted with 20 multiple sclerosis patients. Interviews were conducted individually and face-to-face. The data were analyzed using Colaizzi's phenomenological analysis method. Two main themes (effects of the disease and sexual life) and five sub-themes (physical effects, mental effects, social effects, problems related to sexual life, sexual issues, and coping) were identified in the analysis of the data. As a result of the study, it was determined that the patients experienced serious physical, mental, and social problems due to multiple sclerosis, and their sexual lives were also negatively affected. Individuals experience significant issues related to their sexual life due to multiple sclerosis. Since multiple sclerosis is a multifaceted disease, it is thought that professional evaluation of sexuality in patients, diagnosis of sexual dysfunctions, and taking timely measures are of great importance to improve the quality of life of multiple sclerosis patients.
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İncele - MakaleAçık Erişim2024Scopus SJRQ2Corrosion and adhesion properties of MAO-coated LA91 magnesium alloy
Sukuroglu, Suleyman; Sukuroglu, Ebru Emine; Totik, Yasar; Gulten, Gokhan; Efeoglu, Ihsan; Avci, Selcuk
Magnesium–lithium alloy is used in different areas of industry and is known as a super light metallic engineering material. However, the use of these alloys is limited due to their surface properties under extreme loads and aggressive environments. Surface treatments can be applied to these alloys to increase their usage areas and improve their weak surface properties. In this study, the micro-arc oxidation method was applied to improve the surface properties of LA91 alloy. The corrosion and adhesion behaviour of the coated samples were investigated. The lowest corrosion current density in the coatings was obtained under Experiment 3. Experiment 3 has the highest Lc2 value due to the coating thickness and the denser and smaller diameter pores of the functional intermediate layer.
AtıfScopus15WoS14OpenAlex16İncele - MakaleAçık Erişim2025Scopus SJRQ2Valorisation of bread wastes via the bacterial cellulose production
Güzel, Melih
The short shelf life of bread can be attributed to changes in its textural and sensory properties, a process termed staling, and large amounts of bread residue and waste are generated daily. Because the main component of bread is starch, the use of bread wastes as a substrate for bacterial cellulose (BC) production can significantly contribute to valorisation and reuse of wastes. This study aimed to investigate the BC production potential of various stale breads, convert these wastes into usable forms for food and other industries, and increase their economic value. Stale breads were hydrolyzed with dilute acid, and BC-producing bacteria from Kombucha tea were isolated and identified as Gluconobacter oxydans MG2021 (GO). BCs were produced from bread hydrolysates with GO and Komagataeibacter hansenii GA2016 (KH), and their properties were examined. The results indicated that stale breads represented a good source for BC production, as high BC yields were obtained using GO (8.81%–25.02%) and all BCs had superior properties such as high crystallinity (75.96%–91.39%), thermal stability, liquid holding capacity, and fine fibers (40.16–85.39 nm). This study demonstrated that bread wastes could be used as a low-cost substrate for large-scale BC production, and the abundance of bread wastes demonstrated their potential as a resource for commercial BC producers.
AtıfScopus14WoS14OpenAlex16İncele - MakaleAçık Erişim2024Scopus SJRQ1Accuracy assessment of UAV-based documentation of archaeological site: Kültepe-Kaneš
Günen, Mehmet Akif; Kulakoğlu, Fikri; Besdok, Erkan
High quality 2D/3D metric documentation of archaeological sites is used in many different applications such as archaeological-heritage management, digital archaeological excavation planning, orthophotographic documentation, and ancient Digital Surfaces Models (DSM) research. Structure-from-Motion based photogrammetry (SfM) is an indirect geodesic measurement technique based on multiple view image processing using high-level automation techniques. Using SfM to generate the high accuracy 2D/3D data needed for digital documentation of archaeological cultural heritage is relatively practical, economical, and fast. Factors such as the number of ground control points and their distribution to the study area, the robustness of the camera system model parameters, and the analytical model of the photogrammetric triangulation method used affect the accuracy of the data produced using SfM-photogrammetry. Kültepe-Kaneš, the center of the ancient Kingdom of Kaneš, which is located in central-Anatolia, was an Assyrian Trade Colony active between ca. 2000 BC and 1700 BC. The site, which was the center of the Old Assyrian trade colonies in Anatolia and one of the most important sites in ancient history, has been under excavation for the last 75 years. In this paper, high accuracy digital documentation of the Kültepe-Kaneš archaeological excavation area was made using different SfM methods. Statistical analysis revealed no significant difference in accuracy between Real-Time Kinematic (RTK) and Post-Process Kinematic (PPK) methods for the study area. This suggests that either PPK, RTK, or aerial triangulation with Ground Control Points (GCPs) can be employed to generate orthophotos and DSMs for archaeological sites with relatively flat surface areas, as long as a sufficient number of uniformly distributed GCPs are used.
AtıfScopus10WoS8OpenAlex5İncele - MakaleYalnız künye2025Scopus SJRQ3Ruled surfaces generated by Darboux and instantaneous Pfaff vectors of Salkowski curves in Euclidean 3-space
Mazlum, Sumeyye Gur; Haliscelik, Ebru Cakil; Bektas, Ozcan
In the present study ruled surfaces generated by Darboux and instantaneous Pfaff vectors of Salkowski curves in Euclidean 3-space are considered. Some geometric properties of these surfaces such as striction curves, surface normal vectors, tangent and asymptotic planes, distribution parameters, Gaussian and mean curvatures and fundamental forms are investigated. Some results and interpretations of these surfaces are obtained.
- MakaleYalnız künye2020MODELING OF BOOST AND CUK CONVERTERS AND COMPARISON OF THEIR PERFORMANCE IN MPPT
Güngör, Okan; Yüksek, Halil İbrahim
The efficiency of photovoltaic (PV) panel systems depends on the structure of the photovoltaic cells and the transfer of energy from the PV panel to load. The focus of this study is energy transfer. The most important component in the energy transfer is maximum power point tracking (MPPT). The MPPT consists of two components: the algorithm for calculation the maximum power and the hardware for power generating. This study investigates how some the DC-DC converters (hardware) impact on the performance of the MPPT under six different environmental conditions by using two different duty cycle calculation methods. Contribution of this study to the literatüre is to analyze the performance of some the DC-DC converters in MPPT by completely eliminating the effect of MPPT algorithms. As a result of this study, while using the Boost converter in MPPT applications, the internal resistance of the PV panel must be equal or smaller than load resistance. However, the Cuk converter can reach to maximum power point in all conditions such as temperature, radiation and load.
AtıfScopus2WoS1İncele - MakaleYalnız künye2020Scopus SJRQ1Finite element study on axially loaded reinforced Square Hollow Section T-joints at elevated temperatures
Ozyurt, E.
This study numerically investigates the elevated temperature resistance of collar plate and doubler plate reinforced Square Hollow Section (SHS) T-joints subjected to brace axial compressive load. The extensive numerical simulations were performed to examine the effects of the geometrical parameters of main members and reinforcing plate on the fire resistance of reinforced SHS T-joints after verification of the numerical models based on the available test results. The corresponding unreinforced joints were also analysed as reference resistance at five different temperature levels (20 °C, 400 °C, 500 °C, 600 °C, and 700 °C). Results indicate that the elevated temperature capacity of SHS T-joints can be significantly increased by using a collar plate or a doubler plate. Although the initial stiffness of the doubler plate reinforced joints was higher than the collar plate reinforced joints, their capacity was similar to each other. Also, the fire resistance of the reinforced joints mainly depended on the brace-to-chord width ratio and reinforcing plate thickness to chord wall thickness ratio. However, there was no beneficial effect on the fire resistance of reinforced joints when the thickness of the reinforcing plate was greater than 1.5 times the chord wall thickness. Moreover, there was an insignificant effect of half-width to thickness ratio of the chord, reinforcing length and reinforcing type as long as the required limit values of the reinforcing length and width were used based on the Eurocode 3 EN 1993-1-8. It is worth mentioning that modifying the steel yield strength in the ambient temperature design method to calculate the capacity of the reinforced SHS T-joints at elevated temperatures may be unsafe. A new design method was developed to predict the capacity of a collar plate and doubler plate reinforced SHS T-joints subjected to brace compressive load in fire.
AtıfScopus14WoS13OpenAlex14İncele - MakaleAçık Erişim2020Scopus SJRQ3Mistletoe (Viscum album l.) damage and its economic effects in scots pine (pinus sylvestris l.) natural regeneration and afforestation areas
Ertuğrul, M.H.; Komut, O.
This study discusses the development of mistletoe (Viscum album L.) and its economic impacts on natural afforestation and regeneration areas. In this context, a total of 16 sample areas were determined in Scots pine natural regeneration and afforestation areas with resembling habitat characteristics. The occurrence status of mistletoe in Scots pine (Pinus sylvestris L.) individuals in these areas was determined according to stem, branch and corolla parts and morphological age determination was also conducted for the plants. Additionally, the relationship between diameter and length increase of healthy individuals, and ones affected by mistletoe were modelled with simple linear regression analysis. Besides, the tree asset values of the stands were calculated by estimating maintenance and afforestation costs at the working sites, and economic loss potential was determined through the targeted forest product revenue. Study results have revealed that natural regeneration sites are less exposed to mistletoe damage than afforestation sites. While the mistletoe exposure was found to be 27% in the study areas, it was determined that there was a potential revenue loss of 21% concerning the target economic revenue as well as additional labour and afforestation costs.
AtıfScopus3WoS3OpenAlex2İncele - Kitap BölümüYalnız künye2020Process Uniformity During Electro-Thermal Applications and Modeling Approaches
Altin, Ozan; Ozturk, Samet; Topcam, Huseyin; Karatas, Ozan; Marra, Francesco; Erdogdu, Ferruh
This chapter brings a perspective to issues related to heating uniformity and modeling approaches of novel electrothermal technologies such as radio-frequency (RF) and microwave (MW) heating. Both RF (3 kHz–300 MHz) and MW (300 MHz–300 GHz) waves within the electromagnetic spectrum cause heat generation within foods as a result of molecular polarization and dipole rotation of existing water molecules (polar). RF and MW heating shows a great potential to achieve volumetric and rapid heat generation within food products, maintaining food quality and satisfying safety regulations in food industry compared with conventional heating systems.
AtıfScopus5İncele - Kitap BölümüYalnız künye2020Understanding the European Union: An introduction
Ugur, Omer
- MakaleYalnız künye2021Scopus SJRQ3Flame atomic absorption spectrometric determination of total chromium and cadmium in bean samples after ultrasonic-assisted microextraction using ionic liquid Aliquat-336
Elik, Adil; Karakoy, Tolga; Çilesiz, Yeter; Altunay, Nail
A new and rapid microextraction approach termed as ultrasonic-assisted ionic liquid-based microextraction (UA-ILME) was developed using ionic liquid Aliquat-336 as extraction solvent for the extraction of chromium and cadmium in bean samples collected from different regions in Turkey. The total amounts of analytes in the samples were measured by flame atomic absorption spectrophotometry. The basis of the extraction step is based on the complexation of Cr(III) and Cd(II) with diethyldithiocarbamate at pH 4.0. The hydrophobic ternary complexes containing analytes were then rapidly extracted from the sample solution to the ionic phase under the ultrasonic effect using tricaprylylmethylammonium chloride (Aliquat-336). Some experimental variables (pH, ligand amount, extraction solvent volume, ultrasound time, extraction temperature and sample volume) were optimized in detail. Following the optimization steps, the limits of detection (LODs, 3Sblank/m) for Cr(III) and Cd(II) were calculated as 0.45 ng mL−1 with linear range of 1.5–380 ng mL−1 and 0.25 ng mL−1 with linear range of 0.8–220 ng mL−1, respectively. Enrichment factors and average recoveries were ranged from 125.8–96.4 to 92.7–106.5%, respectively. The accuracy and precision of the method were validated by analyzing a certified reference material and spiked recovery tests. The UA-ILME method was successfully applied to the determination of Cd and Cr in the samples, highlighting that the matrix ions under consideration do not affect the extraction and determination steps.
AtıfScopus4OpenAlex6İncele - MakaleAçık Erişim2021Using of iron, vitamin d, multivitamin in pregnant women and the related factors
Vayisoglu, Sumbule Koksoy; Oncu, Emine; Kazak, Aysun; Aktas, Gamze
Objectives: The aim of this study is to determine the frequency of iron, vitamin D and multivitamin supplement usage among pregnant women and the factors associated with it. Methods: This cross-sectional study was conducted between March 15, 2018 and September 30, 2018 among a total of 400 pregnant women by the questionnaire form consisted of 27 questions. Hemoglobin values below 11g/dl were considered as anemia. Results: The mean age of the pregnant women was 28.2±5.2 years, and 170 (42.5%) of them had anemia. Among the pregnant women, 302 (75.5%) had been recommended to use iron, 208 (52.0%) had been recommended to use Vit D and 308 (77.0%) had been recommended to use multivitamin. Among the pregnant women 250 (62.5%) of them use iron, 146 (36.5%) of them use vitamin D and 262 (65.5%) of them use multivitamin. Conclusion: Although programs for iron and vitamin D have been carried out for many years, the use of vitamin D and iron in pregnant women were not at the desired level. Although there is not a routine recommendation, multivitamin use during pregnancy was found to be quite common.
AtıfScopus1İncele - Kitap BölümüYalnız künye2019Post-fordism and urban policy
Cengiz, Emre
- MakaleAçık Erişim2017Scopus SJRQ1ZnO and ZnO1−x based thin film memristors: The effects of oxygen deficiency and thickness in resistive switching behavior
Gul, Fatih; Efeoglu, Hasan
In this study, direct-current reactive sputtered ZnO and ZnO1−x based thin film (30 nm and 300 nm in thickness) memristor devices were produced and the effects of oxygen vacancies and thickness on the memristive characteristics were investigated. The oxygen deficiency of the ZnO1−x structure was confirmed by SIMS analyses. The memristive characteristics of both the ZnO and ZnO1−x devices were determined by time dependent current–voltage (I-V-t) measurements. The distinctive pinched hysteresis I-V loops of memristors were observed in all the fabricated devices. The typical homogeneous interface and filamentary types of memristive behaviors were compared. In addition, conduction mechanisms, on/off ratios and the compliance current were analyzed. The 30 nm ZnO based devices with native oxygen vacancies showed the best on/off ratio. All of the devices exhibited dominant Schottky emissions and weaker Poole-Frenkel conduction mechanisms. Results suggested that the oxygen deficiency was responsible for the Schottky emission mechanism. Moreover, the compliance currents of the devices were related to the decreasing power consumption as the oxygen vacancies increased.
AtıfScopus68WoS63OpenAlex71İncele - MakaleAçık Erişim2016Scopus SJRQ4Effects of Origanum syriacum essential oil added in different levels to the diet of broilers under heat stress on performance and intestinal histology; [Einfluss des zusatzes der essentiellen Öle von origanum syriacum in unterschiedlicher höhe zum futter auf die leistung und die darmmorphologie von broilern unter hitzestress]
Tekce, E.; Gül, M.
This study compared the effects on performance parameters, intestinal microflora and histology of adding Origanum syriacum (OS) essential oil and an antibiotic (Avilamycin) to the rations of broilers fed under heat stress conditions. The 42-day study used 500 day-old male broilers (Ross-308) divided into 10 groups of 50 animals each. Then, each of these groups was further divided into 5 groups of 10 each. Groups were either kept at 22°C (stress-free) or at 36°C (heat stressed). Birds were fed with 5 experimental diets: control (basic feed (BF) without feed additive), antibiotic (BF + 100 mg/kg Avilamycin), OS 100 (BF + 100 mg/kg OS), OS 300 (BF + 300 mg/kg OS, OS 600 (BF + 600 mg/kg OS). At the end of the study period, some performance parameters, including feed intake, feed-conversion ratio, body weight, average daily weight gain, ileum crypt depth, villus height and microflora, decreased in groups under heat stress without additives (P < 0.01). However, comparison with the control group and the antibiotic group showed that adding OS essential oil provided a benefit close to that of the antibiotic, yet still inadequate, even at the 600 mg/kg dose.
AtıfScopus17WoS15OpenAlex12İncele - MakaleYalnız künye2018Scopus SJRQ3In vitro antioxidant and antimicrobial activities of the five different solvent extracts of Centaurea pulcherrima var. Freynii from Turkey
Ozcan, Kadriye; Acet, Tuba
Various extracts of Centaurea pulcherrima var. freynii were investigated for total phenolic, flavonoid, antioxidant and antimicrobial activities. The antioxidant properties of plant extracts were evaluated by free radical scavenging assays (DPPH and ABTS). Antimicrobial activities were examined using disc diffusion methods. According to the results of antioxidant capacity assays, the plant showed moderately antioxidant activity in test methods. It was found that ethyl acetate extract showed the most effective activity including total phenolic, flavonoid, antioxidant and antimicrobial activities.
AtıfScopus11WoS10İncele - MakaleYalnız künye2018Scopus SJRQ2Relationship between the geological environment and element accumulation capacity of Helichrysum arenarium
Vural, Alaaddin
This study was carried out to determine the effect of geological environment on the biogeochemical properties of Helichrysum arenarium. Plant samples from Upper Cretaceous andesite, basalt, and their pyroclasts; Eocene andesite, basalt, and their pyroclasts; and Upper Eocene granitic rocks were collected. Roots, stems, and flowers of the plant were analyzed to determine their major and trace elements, such as Ca, Mg, Al, Na, K, Fe, Mn, U, Sr, P, La, Cr, Ba, Ti, B, W, Hg, Cs, Hf, Rb, Zr, and Ce. This study is one of the few studies in which the element content of H. arenarium is studied in detail and the element accumulation capacities are examined according to the types of rocks the plants grow. Result showed that the plants exhibited different element accumulation capacities according to the lithological environments where they grew. The element concentrations in the root, stem, and flower of the plant were predominantly high in Eocene andesite, basalt, and pyroclasts. High values were also observed in plants grown on the Upper Eocene granitic rock. Some elements were also high in plants grown in the Upper Cretaceous andesite, basalt, and pyroclasts. Therefore, the high element contents of plant are related to the element contents of the rocks where the plants grew. Furthermore, the alteration and tectonic influences on the plants are also influential.
AtıfScopus16WoS13OpenAlex18İncele - MakaleAçık Erişim2018Scopus SJRQ3A new species of the genus microliobunum from Turkey (Opiliones, Sclerosomatidae)
Kurt, Kemal
A new harvestman species, Microliobunum erseni sp. nov., is described and illustrated with photographs of both sexes from Kilis Province, Turkey. It is the second species in this genus, which is otherwise known only from Lebanon.
AtıfScopus2WoS2OpenAlex3İncele - MakaleYalnız künye2023Scopus SJRQ3Economic and Institutional Determinants of Corruption: The Case of Developed and Developing Countries
Acaravci, Ali; Artan, Seyfettin; Hayaloglu, Pinar; Erdogan, Sinan
Since ancient times, corruption has been one of the essential topics for economists and politicians. Moreover, it is a concern for both developed and developing countries and a significant obstacle to economic development. The primary objective of this paper is to examine the relationships between corruption, economic growth, internet use, and quality of governance alongside other institutional and economic variables in 65 developed and developing countries for the period 1999–2016 by using dynamic panel data methods performing well under cross-sectional dependence. The empirical results can be summarized as follows. The augmented mean group (AMG) results indicate statistically significant relationships between corruption, economic growth, internet use, quality of government, and democracy. Also, we find that an increase in economic growth and quality of governance contribute to reducing corruption in these 65 developed and developing countries. In contrast, an increase in internet use and democracy level raises corruption. The policy implications of the empirical estimations are also discussed in the paper.
AtıfScopus11WoS8OpenAlex17İncele
