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Koleksiyondaki öğeler
- MakaleAçık Erişim2024Scopus SJRQ2Anti-inflammatory activities of some Anthemis species used in the treatment of inflammation-related diseases, GC/MS and LC-MS/MS analysis with bioactivity-guided fractionation
Yıldırım, Aybeniz; Gül, Abdulkadir; Başaran, Nihal; Şen, Ali; Bitiş, Leyla; Tanyıldızı, M.Şaban
Recent studies have focused on Anthemis sp. because of their rich chemical composition and application in the treatment of diseases associated with inflammation. The purpose of this study was to determine the active chemicals responsible for the anti-inflammatory properties of Anthemis cotula, A. tomentosa, A. austriaca, and A. tinctoria var. tinctoria. Therefore, the 5-Lipoxygenase (5-LOX) was used to assess the anti-inflammatory properties of methanol extracts that were extracted from the aerial parts of the mentioned species, with an IC50 value of 23.88 μg/mL, the methanol extract of A. tinctoria var. tinctoria demonstrated anti-inflammatory effects close to the standard (Indomethacin, IC50: 18.05 μg/mL). Compared to the other extracts, the methanol extract of A. tinctoria var. tinctoria demonstrated significantly greater anti-inflammatory activity. A. tinctoria var. tinctoria and A. tomentosa methanol extracts, which were the most active in comparison to other extracts, were fractionated using the bioactivity-guided fractionation method. Their anti-inflammatory properties were evaluated to determine the compounds responsible for the activity. With an IC50 value of 3.44 μg/mL, the ethyl acetate fraction of A. tinctoria var. tinctoria (ATiEA) was found to be the most active of all the fractions. After ATiEA was further fractionated using column chromatography, it was found that ATiEA-II, one of its sub-fractions, was more effective than other sub-fractions against the 5-LOX, with an IC50 value of 2.93 μg/mL. Furthermore, the sub-fractions' total phenol and flavonoid contents were examined to confirm their anti-inflammatory properties. The sub-fraction ATiEA-II exhibited higher total flavonoid content (743,86 μg QE/g dry weight) and total phenol content (4659.36 μg GA/g dry weight) than other sub-fractions, which was in line with its anti-inflammatory activity. GC/MS and LC-MS/MS were used to clarify the effective compounds of the sub-fraction ATiEA-II. Experiments on the anti-inflammatory properties of different Anthemis sp. have demonstrated the good anti-inflammatory potential of this species. Specifically, ATiEA-II, a sub-fraction of A. tinctoria var. tinctoria, may contain a novel anti-inflammatory drug molecule.
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İncele - MakaleAçık Erişim2024Scopus SJRQ2Approximate Solutions of Fractional Differential Equations Using Optimal q-Homotopy Analysis Method: A Case Study of Abel Differential Equations
Şengül, Süleyman; Bekiryazici, Zafer; Merdan, Mehmet
In this study, the optimal q-Homotopy Analysis Method (optimal q-HAM) has been used to investigate fractional Abel differential equations. This article is designed as a case study, where several forms of Abel equations, containing Bernoulli and Riccati equations, are given with ordinary derivatives and fractional derivatives in the Caputo sense to present the application of the method. The optimal q-HAM is an improved version of the Homotopy Analysis Method (HAM) and its modification q-HAM and focuses on finding the optimal value of the convergence parameters for a better approximation. Numerical applications are given where optimal values of the convergence control parameters are found. Additionally, the correspondence of the approximate solutions obtained for these optimal values and the exact or numerical solutions are shown with figures and tables. The results show that the optimal q-HAM improves the convergence of the approximate solutions obtained with the q-HAM. Approximate solutions obtained with the fractional Differential Transform Method, q-HAM and predictor–corrector method are also used to highlight the superiority of the optimal q-HAM. Analysis of the results from various methods points out that optimal q-HAM is a strong tool for the analysis of the approximate analytical solution in Abel-type differential equations. This approach can be used to analyze other fractional differential equations arising in mathematical investigations.
AtıfScopus4WoS5OpenAlex5İncele - MakaleAçık Erişim2024Scopus SJRQ3Characterization of Water-Soluble Extracellular Polysaccharide from Aeribacillus pallidus IM17
Genc, Berna; Tunç, Merve Tuğçe; Adiguzel, Ahmet
The production of the extracellular polysaccharide from the thermophilic bacterium Aeribacillus pallidus was carried out in the study. The polysaccharide was isolated and characterized by means of GC–MS, FT-IR, DSC, and XRD analyses. The rheological, foaming, and emulsifying properties of the polysaccharide were determined. Using a sucrose-rich medium, 27.1 mg dried EPS/100 mL was obtained with 94% carbohydrate and 1.5% protein. The monosaccharide profile of water-soluble EPS-IM17 was composed of rhamnose, arabinose, xylose, mannose, glucose, and galactose. The foaming capacity and stability of EPS-IM17 were 26.67% (± 4.71) and 40.01% (± 4.95), respectively, and the foaming stability was not affected by time. The emulsification index of EPS-IM17 was 64.54 (± 8.71) and decreased to 38.47 (± 10.44) after 24 h. EPS-IM17 had a crystalline structure. Solutions at different concentrations (10, 20, 40 mgmL-1) showed pseudoplastic behavior. In conclusion, this report could be a lead study for the use of Aeribacillus pallidus extracellular polysaccharide for different applications.
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İncele - MakaleYalnız künye2025Scopus SJRQ1Influences of chord pre-stress on CHS X-joints with high-strength-steel at various temperatures
Ozyurt, E.; Wang, Y.C.
This study examines the influence of chord pre-stress on the behaviour and load resistance of Circular Hollow Section (CHS) X-joints with High Strength Steel (HSS) at various temperatures. This investigation uses a total number of seven hundred and four Finite Element simulation results to evaluate the level of accuracy of current Eurocode and CIDECT design guidelines in predicting the high-temperature resistance of these joints. The numerical simulations investigate the effects of changing brace-to-chord diameter (β), chord semi-diameter-to-thickness (γ), and brace-to-chord thickness (τ) ratios, as well as different prestressing levels (np) and temperatures (θ). The γ and τ ratios have a limited effect on the normalised joint strength, but the β ratio, and the prestressing level are highly influential. At ambient temperature, the CIDECT design approach is a more suitable method for calculating the chord pre-stress reduction factors for S355 joints. For HSS X-joints, the constant modification coefficient of 0.80 is inadequate, and this paper has proposed a new modification coefficient as a function of the pre-stress level. At elevated temperatures, the ambient temperature resistance of CHS X-joints can be modified by the reduction factor of the Young's modulus for S355 steel and that of the yield stress for S960 steel.
AtıfScopus3WoS3OpenAlex2İncele - Kitap BölümüYalnız künye2025Scopus SJRQ3Seismological Aspects of Doublet Earthquakes Mw 7.8, and Mw 7.6, 6th February 2023, Türkiye/Syria Earthquake and Its Aftershocks: Causes and Consequences
Polat, Orhan; Ozer, Caglar; Ozturk, Serkan
Two devastating earthquakes occurred on the Eastern Anatolian Fault Zone (EAFZ), measuring 7.8 and 7.6 moment magnitudes (Mw), struck Türkiye and Syria on February 6, 2023. The first earthquake Mw7.8 took place on the EAFZ in Pazarcik district of Kahramanmaras city and the second earthquake (Mw7.6) was on Cardak Fault (CF, an E-W aligned segment of the EAFZ) in Elbistan district of the same city. The first earthquake on EAFZ and the second earthquake on CF reveal dominant sinistral strike-slip character according to focal mechanisms solutions of aftershocks (e.g., Mw = 6.8, Mw = 6.4). Total number of aftershocks exceeds 58,000 as of November 2023. Destructive earthquakes have resulted significant impact on 11 cities in Türkiye and 5 provinces in Syria. Doublet earthquakes (compound earthquake) and aftershocks have caused remarkable surface rupture that exhibit horizontal and vertical slips along NE-SW oriented EAFZ (400 × 40 km2) and E-W aligned CF (250 × 40 km2). Based on the seismicity analysis, 88% (45 events over 51 of the aftershocks with magnitudes greater or equal to 5.0 occurred within the first three days following the Mw = 7.8 mainshock. The state of stress from 1977 to the Kahramanmaras doublet earthquakes (DEQ), was almost shear stress regime whereas it reveals between extension (normal) to strike-slip regime. The CF zone area exhibits a dominant shear stress regime. The Kahramanmaras earthquake has generated remarkable set of surface ruptures about ~ 500 km, in total (~ 350 km long for EAFZ and ~ 150 km for CF) with a dominant sinistral strike-slip character. These ruptures could be observed mainly from the south of Hatay city up to north of Celikhan district along the EAFZ, and between Goksun district and Kelhalil village along the CF. Seismic gaps with low geodetic strain rates and low background seismicity were observed between Islahiye (Hatay city) and Nurdagi (Gaziantep city) districts, and around Pazarcik district (Kahramanmaras city). The largest peak ground acceleration (PGA) was recorded by Pazarcik station (Code: 4614) with about 2 g (2039 gal) in the EW component. The next target location for destructive earthquake could be on the Cyprus arc towards Island with the potential to cause a tsunami, or could occur along the DSF by affecting Syria and Lebanon. The EAFZ is an important reminder that large faults can generate very large earthquakes on multiple segments as Türkiye and Syria have experienced during and after the Mw = 7.8 mainshock.
AtıfScopus5OpenAlex4İncele - Kitap BölümüYalnız künye2024Ombudsman in Turkey and cooperation with universities: The case of Ombudsman Student Clubs
Doğan, Kadir Caner
The ombudsman is an institution that accepts citizens' complaints about bad governance practices and the behavior of public administration. Today, it is seen in almost all states of the world. One of its application areas is universities. University ombudsman offices in some parts of the world mostly solve problems between students and the administration. Although there is no example of a university ombudsman in Turkey yet, there is cooperation between the Ombudsman Institution of Turkey and universities. Indeed, ombudsman student clubs established within universities in Turkey create mutual cooperation and synergy between the two institutions. This study aims to identify the ombudsman student clubs in universities in Turkey and evaluate their activities, projects, and academic contributions to the ombudsman. In this way, it is aimed to analyze the contributions of universities, which are higher education institutions, to the ombudsman, their awareness in society and their benefits to justice at the educational level. Document analysis based on qualitative analysis will be used as a method in the research. It is aimed to collect the necessary data, documents and data through contact with ombudsman clubs via e-mail, web, newsletter, report or telephone. In addition, the necessary activities, projects and data will be obtained from the Ombudsman Institution of Turkey, and the information will be analyzed.
- MakaleAçık Erişim2025Scopus SJRQ1The evaluation of the mediation role of life engagement in resilience and trauma levels of individuals experiencing the earthquake in Kahramanmaraş, Türkiye
Özmaya, Esma; Erkoç, Beyza; Kalaycı, Sami; Uzun, Sevda; Lotfi, Sayra
The aim of this study is to evaluate the mediation role of life engagement in resilience and trauma levels of individuals experiencing the earthquake on February 6, 2023 in the city of Kahramanmaraş in Türkiye. The sample of this descriptive and correlational study included 1406 individuals. The questionnaire data was obtained through Google Forms and other data collection tools were Socio-demographic Information Form, Trauma Level Determination Scale, Short Resilience Scale and Life Engagement Scale. To analyse the data, frequency (percentage, arithmetic mean) and correlation analyses were used. Depending on the findings of the study, the resilience and trauma levels were negatively correlated, whereas the resilience and life engagement levels were positively correlated. Furthermore, the life engagement levels were negatively correlated with trauma levels while they were positively correlated with resilience. It was found that the life engagement played an mediation role in resilience and trauma levels of individuals experiencing the earthquake in Kahramanmaraş, Türkiye. In this study, we found that the life engagement has an important role in resilience and trauma levels of individuals. We are of the opinion that the findings of this study might help researchers and conductors to plan and perform effective strategies for post-impact phase of an earthquake.
AtıfScopus1WoS1OpenAlex1İncele - MakaleYalnız künye2025Scopus SJRQ2Analysis of drought in upper Moulouya Basin (Morocco): a combination of drought indices, classic and innovative trend tests
Qadem, Zohair; Hadria, Rachid; Ettaqy, Abderrahim; Kankal, Murat; Şan, Murat; Nacar, Sinan
This study aimed to examine the temporal and spatial variation of drought in the upper Moulouya Basin, Morocco’s arid and semi-arid region. For this purpose, the Standardized Precipitation Index (SPI) was calculated at various time scales (3, 6, 12, and 24 months) using precipitation data collected from eight stations between 1977 and 2019. The data trends were analysed by classical modified Mann-Kendall (MMK) and Innovative Trend Analysis (ITA). Severe drought events were identified in the 1980s, and 1998–2000, while exceptionally wet years were recorded in periods 1996–1997 and 2008–2012. SPI trend analyses revealed a holistic increase on almost all timescales and at all stations. The increase was found to be higher in more extended time scales. Except for a few stations, SPI values in dry, normal, and wet classes of ITA method increased in the second half (1998–2019) compared to the first half (1978–1997). The ITA method detected different trends for different classes at two stations compared to the MMK method. This situation revealed the importance of analysing the trends of different methods in drought studies. These results are essential for water resources management and adaptation to climate change in arid and semi-arid zones.
AtıfOpenAlex1İncele - MakaleAçık Erişim2025Scopus SJRQ2Slag Substitution Effect on Features of Alkali-Free Accelerator-Reinforced Cemented Paste Backfill
Cavusoglu, Ibrahim
Cemented paste backfill (CPB) improves underground stability by filling mine voids, but the high cost of cement presents economic challenges for miners. While alternative binders and admixtures have been explored, the combined impact of slag substitution and alkali-free (AF) accelerators on CPB performance is not yet fully understood. This study investigates the influences of slag substitution and AF accelerators on the performance of CPB through a comprehensive experimental approach. CPB samples were prepared with slag substitution ratios of 25%, 50%, and 75%, maintaining a fixed AF accelerator content of 0.4%. Various test techniques, including unconfined comprehensive strength (UCS), mercury intrusion porosimetry (MIP), X-ray diffraction (XRD), and thermal analysis (TG/DTA), were employed to study their mechanical and microstructural properties. Monitoring tests were also conducted to thoroughly assess the performance of CPB, including suction (self-desiccation), electrical conductivity (EC), and volumetric water content (VWC) tests. The results showed that the PCI50–SL50–0.4AF sample exhibited 2.3 times higher strength than the control sample for 28 days, with this improvement attributed to enhanced pozzolanic reactions contributing to better microstructural compactness. Monitoring tests revealed accelerated hydration kinetics and reduced water content in slag-reinforced CPB, highlighting the significant role of AF accelerator in facilitating rapid setting and improving early-age mechanical strength. Microstructural findings revealed that porosity decreased and C–S–H gel formation increased in the specimen containing slag and AF accelerators, contributing to increased strength and durability. These findings highlight the potential usage of slag and AF accelerators to enhance CPB’s mechanical, microstructural, and hydration properties, offering significant benefits for mining operations by improving backfill performance, while contributing to environmental sustainability through reduced cement consumption and associated CO2 emissions.
AtıfScopus4WoS4OpenAlex3İncele - MakaleAçık Erişim2024Scopus SJRQ1Exploring the enablers for building resilience in solar photovoltaic Energy supply chains
Erol, Ismail; Peker, Iskender; Benli, Tolga; Ar, Ilker Murat; Searcy, Cory
A solar photovoltaic energy supply chain (SPvESC) is a global network with several linkages, including mineral and metal mining, material processing, and module and panel manufacturing. Due to the wide range of uncertainties and the unfavorable environmental effects associated with current linear business models, this global network is vulnerable to disruptions. Strengthening the resilience of SPvESCs is crucial for addressing any disturbances. This requires identifying the key enablers of resilience in SPvESCs, an area that has been understudied in the existing literature. An enabler is an aspect that facilitates the achievement of a goal by another aspect. This research contributes to the existing literature by systematically investigating the enablers for SPvESCs to achieve resilience. Thus, the objective of this analysis is to identify enablers that have the potential to enhance the resilience of SPvESCs in Türkiye. This was done by applying the Nominal Group Technique (NGT) in conjunction with a review of the current literature. Neutrosophic (N)-DEMATEL was then utilized to determine the relationships between the identified enablers. Finally, the results were validated using N-DELPHI. The results revealed that sensing and seizing new business models, adaptability to changes in novel energy generation and information technologies, and business contingency plans for natural and man-made disasters were the most influential enablers. The findings provide implications for practitioners, policymakers, and researchers to help ensure improved resilience in SPvESCs.
AtıfScopus12WoS9OpenAlex11İncele - MakaleYalnız künye2025Scopus SJRQ3Characterization of Aroma Components by HPLC-DAD and HS-SPME/GC-MS of Whortleberry and Bilberry Fruits (Vaccinium arctostaphylos L. and Vaccinium myrtillus L.)
Öz, Mehmet; Fidan, Muhammed Said; Baltacı, Cemalettin
In this study; aroma components, some biochemical properties (sugar amount (HPLC-DAD), vitamin C amount, water-soluble solids amount) and antioxidant capacities (bioactive component contents and antioxidant capacity amounts) of V. arctostaphylos and V. myrtillus fruits were determined. Methanol extraction was applied to the fruit samples, which were made homogeneous after being shredded. Aroma (volatile) components were determined by HS-SPME/GC-MS (Headspace-Solid Phase Micro Extraction) technique combined with Gas Chromatography-Mass Spectrometry. Total antioxidant activity (TAC), total phenolic substance amounts (TPC) and total flavonoid substance amounts (TFC), which are among the bioactive component contents, were examined. As antioxidant capacity, the amount of free radical scavenging (DPPH and ABTS) activity and the amount of ferric (III) ion reducing antioxidant power (FRAP) capacity were determined. As a result of the analyses, 27 and 33 aroma compounds were determined in V. arctostaphylos and V. myrtillus fruits, respectively. The main components found among the aroma compounds are α-terpineol (22.67%), (E)-2-hexenal (17.63%), and linalool (9.78%). in the V. arctostaphylos fruit. V. myrtillus fruits were determined to contain menthol (22.93%), α-eudesmol (11.50%), and germacrene D (8.33%). In addition, the chemical classes of aroma compounds identified were monoterpenoid, aldehyde, hydrocarbon, alcohol, ester, sesquiterpene, and sesquiterpenoid classes in V. arctostaphylos and V. myrtillus fruits. Moreover, the total sugar amount in V. arctostaphylos fruits was found to be 11.30%, and the total sugar amount in V. myrtillus fruits was 13.94%. The amount of vitamin C in V. arctostaphylos fruits was detected as 33.26 mg/kg, and the amount of vitamin C in V. myrtillus fruits was contained as 44.17 mg/kg. The amount of water-soluble solids in V. arctostaphylos and V. myrtillus fruits was determined to be 12.13% and 13.43%, respectively. The amounts of total sugar, vitamin C and water-soluble solids in V. myrtillus fruits were higher than the amounts in V. arctostaphylos fruits. According to the antioxidant results, the TAC, TPC, DPPH, ABTS and FRAP values of the methanol extract obtained from V. myrtillus fruits, excluding TFC, demonstrated higher antioxidant features than the values attained from V. arctostaphylos fruits.
AtıfScopus1İncele - MakaleYalnız künye2017Scopus SJRQ2An Investigation of Corrosion Resistance and Antibacterial Sensitivity Properties of Nano-Ag-Doped TiO 2 Coating and TiO 2 Coating Grown on NiTi Alloy with the Micro-Arc Oxidation Process
Karabudak, Filiz; Yeşildal, Ruhi; Şüküroğlu, Ebru Emine; Şüküroğlu, Süleyman; Zamanlou, Hamid; Dikbaş, Neslihan; Bayındır, Funda; Şen, Sadri; Totik, Yaşar
In this study, TiO 2 coatings were grown with nano-Ag doped and micro-arc oxidation technique on NiTi shape memory alloy. The antibacterial sensitivity and corrosion resistance characteristics of both coatings were investigated. The microstructure and composition analyses of the coatings were performed with scanning electron microscope, energy dispersive X-ray spectrometry, and X-Ray diffraction (XRD). The XRD results showed that there were only TiO 2 crystal phases (anatase and rutile) on the coating. The results showed that a clean and dense oxide layer was grown on the surface successfully. The surface of nano-Ag-doped TiO 2-coated samples appear to be smoother than the surface of the coatings without Ag. The corrosion tests of the coated and uncoated samples were carried out in three different environments (simulated body fluid, synthetic saliva, and cola) at 37 ∘ which is human body temperature. The corrosion tests showed that the corrosion resistance of TiO 2-coated and nano-Ag-doped TiO 2-coated samples was much higher than the corrosion resistance of the NiTi substrate. Seven different bacteria including (S. aureus, L. monocytogenes, Bacillus subtilis, Salmonella enteritidis, Yersinia enterocolitica, and E. coli, P.aeruginosa) which have the human pathogen feature were used in the antibacterial susceptibility tests. The process was conducted based on the disk diffusion method to test the susceptibility of bacterial strains on the selected coated and uncoated samples, and antimicrobial activity was evaluated in the nano-Ag-doped TiO 2-coated material; P.aeruginosa, Y. enterocolitica, and E. coli (zone diameter of 8–14 mm) were found to be moderately susceptible; S. aureus, L. monocytogenes, B. subtilis, and S. enteritidis (zone diameters of 8–14 mm) were found to be resistant. The antimicrobial activity of the coating material NiTi was found to be sensitive for all antibacterial tests. According to the TiO 2-coated material results, S. aureus, P.aeruginosa, L. monocytogenes, E. coli were found to be moderately sensitive and Y. enterocolitica, S. enteritidis, and B. subtilis were found to be resistant.
AtıfScopus32WoS29OpenAlex32İncele - MakaleYalnız künye2017Scopus SJRQ3Remote sensing technique for capturing and exploration of mineral deposit sites in Gumushane metallogenic province, NE Turkey
Vural, Alaaddin; Corumluoglu, Özsen; Asri, Ibrahim
This study examines the determination and confirmation of mineral deposits in the Gumushane Province,Turkey. Rather than using classical techniques, Remote Sensing (RS) and Geographic Information System GIS technologies are applied for this purpose. Mineral alteration traces on the ground are characteristic indicators of ore below the surface. These traces can be determined using RS techniques. The Crosta technique is one of the most important RS image analysis methods used for the determination of mineral alterations. The technique has shown particular usefulness around mine areas, which are rich in ore deposits and show hydrothermal alterations. Therefore, four separate mine fields covering a total area of 718 km2 in the southern part of Gumushane, which is rich in iron oxides, hydroxides and hydrothermal alteration, were chosen. The Crosta technique was applied to the satellite image of each area to explore the regional alterations. The determined locations could be confirmed as alteration areas. Within these four regions, some other locations showing similar alteration patterns were also determined using the Crosta technique. These locations represent good candidates for mineral exploration.
AtıfScopus15WoS12OpenAlex17İncele - BildiriAçık Erişim2018Impacts of a photovoltaic power plant for possible heat island effect
Demirezen, Emre; Ozden, Talat; Akinoglu, Bulent G.
Today, solar energy conversion technologies take a significant place within the efforts of obtaining renewable and sustainable energy around the world, and show a rapid progress. One of the most common technologies is photovoltaic power plants (PVPP) which are built using PV modules that provide electricity directly from sunlight. These plants are qualified as one of the pioneering applications among clean energy production methods. However, as the modules cover large areas and as they are produced by mostly dark-colored solar cells, an environmental debate has already been opened via some recent studies in the literature: Do they alter the solar reflectivity (albedo) of the region's surface where they are installed, and in turn affect the typical microclimate characteristics of that region such as the local air temperatures, humidity, pressure and wind speed? Considering also the additional heat that the modules radiate while producing electricity, the main probable result should be expected as Heat Island Effect (HIE). HIE has been particularly discussed for about last 10 years. Basically, this effect defines the day-night and inter-seasonal variations of local temperatures due to artificial changes on the natural land surface. Accordingly, when an urbanized area is compared with the neighboring rural areas, the difference is specifically named as Urban Heat Island (UHI) effect. In the present work, we are conducting a field research with in-situ measurements taken by the two weather monitoring stations inside and outside a PVPP in the district Tavsanli (Kutahya, Turkey). We also provide the meteorological data of Tavsanli station from Turkish State Meteorological Service (TSMS), which is the nearest weather monitoring station to the PVPP under inspection. These stations have been collecting the data of air temperature, relative humidity, average wind speed and atmospheric pressure every 10 minutes since October 2017. We used two statistical methods to compare and interpret the first 8-month data of all the three stations. We considered the statistical significance tests for both the first 8 months as a whole and dividing it into two 4 months before and after the PVPP becomes operational. We found that the measurements of the three stations differ significantly for most of the weather parameters. We also carried out pairwise tests and showed that each pair has significant differences for most parameters.
AtıfScopus2WoS3OpenAlex6İncele - Kitap BölümüYalnız künye2019University students’ motivations for watching social media advertisements: A study in the context of uses and gratifications theory
Diker, Ersin; Gencer, Zekiye Tamer
Social media tools which are popular today among young people, especially university students, provide individuals opportunities to create their own profiles and share music, videos and photos related with their interests. These social networks sometimes surpass traditional socialization spheres such as family, school, peer groups and society, and they also cause traditional media means (TV, radio, newspaper, etc.) to lose their effects. These media tools play an important role on the individuals to create their own identities in the socialization process. The identities of this new platform, its connections and the contents produced generate a new generation. Digital networks provide for this new generation an easy and convenient platform to communicate with their family, friends and the others. In addition, they provide maximum pleasure and gratification for these individual users by fulfilling their needs constantly and immediately. In the past, people used to use various mass communication tools like television, radio and movies as well as face-to-face human interaction in order to fulfill these needs and desires. Most of the time, these gratifications could not realize because of the reasons such as inaccessibility, responding, programming and timing. Social networks have become to be preferred as the use of social networks are different from the traditional mass communication tools and the individuals play an active role on sending messages to others. In this respect, individuals, thanks to not only mediative social contact but also accessing other media contents optionally and eagerly, are satisfied immediately with the….
- MakaleYalnız künye2015Scopus SJRQ2Gamma ray spectrometry for recognition of hydrothermal alteration zones related to a low sulfidation epithermal gold mineralization (eastern Pontides, NE Türkiye)
Maden, Nafiz; Akaryali, Enver
This study presents an interpretation of radiospectrometric and magnetic data of Arzular mineralization site, which is one of the best examples for epithermal gold deposits located in the southern zone of the Eastern Pontides (NE Türkiye). Potassium is generally the most useful pathfinder element for gold mineralization zones because of its high level in altered rock surrounding the deposits. Where gold is hosted within quartz veins, typically the vein is low in the radioelements, but the hydrothermally altered host rocks will usually have a distinct radioelement signature useful for exploration. In this study, magnetic, susceptibility and radiospectrometric survey data radiometric signatures associated with the host rocks favorable for the mineralization, enhancing techniques such as the ratio maps as well as potassium (%K), equivalent thorium (eTh ppm) and equivalent uranium (eU ppm) maps were utilized. Our analysis showed that the gold mineralization associated with the alteration is significantly related to increase in potassium, due to adularia, a low T K-feldspar, and decreases in uranium and thorium due to the hydrothermal alteration and magmatic intrusion processes during the regional tectonic activities.
AtıfScopus56WoS41OpenAlex60İncele - MakaleAçık Erişim2018Scopus SJRQ1Combination of discontinuity characteristics and GIS for regional assessment of natural rock slopes in a mountainous area (NE Turkey)
Bostanci, Hasan Tahsin; Alemdag, Selcuk; Gurocak, Zulfu; Gokceoglu, Candan
Geographical Information Systems (GIS) have a very large spectrum of users. As in many engineering applications, GIS are frequently used in geotechnical projects, especially in producing various thematic and zoning maps such as various susceptibility and hazard maps. Instability maps for large areas with similar characteristic can be produced in a practical way by evaluating the results obtained by the data collected from field and laboratory studies. In order to introduce a methodology for producing rock slope instability maps for a large area, discontinuity controlled slope failures in the Köse Granitoid Complex (NE Turkey) were selected. To determine the types of failure such as planar, wedge, and toppling, and possible instable slope orientations kinematic analyses were carried out in the limited areas. The relationships between orientations of natural slopes and discontinuities obtained from kinematic analyses were evaluated with GIS software. Finally, discontinuity controlled instability maps were produced for the study area. Resulting maps show that the most common type of failure is wedge type. Additionally, the distributions of unstable areas along road networks were determined. Various land use types such as agriculture, grassland, settlement, and forest were also classified in order to predict the possible effects of slope instabilities. The methodology introduced in this study indicates highly promising results for the assessment of rock slope instability in large areas.
AtıfScopus22WoS22OpenAlex25İncele - MakaleYalnız künye2017Scopus SJRQ3Effect of dc field on ac-loss peak in a commercial Bi:2223/Ag tape
Öztürk, Ali; Düzgün, Ibrahim; Çelebi, Selahattin
Measurements of the ac susceptibility in a commercial Bi:2223/Ag tape for some different ac magnetic field amplitudes, Hac, in the presence of bias magnetic field Hdc directed along Hac are reported. It is found that the peak values of the imaginary component of ac susceptibility χ″max versus Hac trace a valley for the orientation where applied field Ha perpendicular to wide face of the tape total. We note that the observation of the valley depends on various parameters such as field dependence parameter n in the critical current density, in the simple power law expression jc = α(T)/Bn, choice of the bias field Hdc together with selected ac field amplitudes Hac, and dimension and geometry of sample studied. Our calculations based on critical state model with jc = α(1 - T/Tcm)p/Bn using the fitting parameters of n = 0.25, p = 2.2, Tcm = 108 K gives quite good results to compare the experimental and calculated curves.
AtıfScopus1WoS1OpenAlex1İncele - MakaleAçık Erişim2018Scopus SJRQ2Type, quantity, and re-use of residues in the forest products industry in Trabzon, Turkey
Top, Yener; Adanur, Hakan; Oz, Mehmet
It is necessary to know the type and quantity of wastes to select the proper applications and waste management strategies. This study investigates the type, quantity, and utilisation methods of wastes generated by micro-sized enterprises that produce timber and furniture, which are two major sub-sectors of the forest products industry in Trabzon. A total of 885 enterprises of manufacturing timber and furniture in Trabzon were identified by reviewing the records from the professional chambers of commerce. The stratified sampling method was used to compare the sub-sectors, and the sample size was determined as 120. Among these, 70 furniture- and 50 timber-producing enterprises were interviewed. The chi-square test was used to determine whether the applications of timber and furniture enterprises are dependent on each other. In general, there are no differences in waste utilisation applications and education level between the sub-sectors. The percentage of the owners/managers that received any vocational training is 77.5% in two sub-sectors. In general, engineered wood wastes are used as fuel. The majority of the owners/managers in the timber industry believe that their waste has an economic value compared to those in the furniture sector. The total amount of wood waste generated by sectors was 528 tons in a month.
AtıfScopus12WoS14OpenAlex13İncele - MakaleAçık Erişim2021Scopus SJRQ4Non-destructive detection of sesame oil adulteration by portable FTNIR, FT-MIR, and Raman spectrometers combined with chemometrics
Menevseoglu, Ahmed
Edible oils are often adulterated with fixed oils because of their high quality and price. Sesame oil is prone to adulteration due to its high commodity value and popularity. Therefore, a rapid, simple, and non-invasive method to detect adulteration in sesame oil is necessary for quality control purposes. Handheld and portable FT-NIR, FT-MIR, and Raman spectrometers are easy to operate, non-destructive, rapid, and easy to transport for in-situ assessments as well as being cheaper alternatives to traditional instruments. This study aimed to evaluate three different vibrational spectroscopic techniques in detecting sesame oil adulteration with sunflower and canola oil. Sesame oils were adulterated with fixed oils at different concentrations (0 – 25%) (w/w). Spectra were collected with portable devices and analyzed using Soft Independent Modelling of Class Analogy (SIMCA) to generate a classification model to authenticate pure sesame oil and Partial Least Squares Regression (PLSR) to predict the levels of the adulterant. For confirmation, the fatty acid profile of the oils was determined by gas chromatography (GC). In all three instruments, SIMCA provided distinct clusters for pure sesame oils and adulterated samples with interclass distance (ICD) over 3. Furthermore, FT-NIR and FT-MIR showed excellent performance in predicting adulterant levels with rval>0.96. Specifically, the FT-MIR unit provided more precise classification and PLSR prediction models over FT-NIR and Raman units. Still, all the units can be used as an alternative method to traditional methods such as GC, GC-MS, etc. These units showed great potential for in-situ surveillance to detect sesame oil adulterations.
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