Yayınlar
Koleksiyondaki öğeler
- BildiriAçık Erişim2017Scopus SJRQ3Fluoride levels in the Eastern Black Sea Basin streams, Turkey
Bayram, A.; Satilmiş, U.; Nas, S.S.; Kemer, B.
The aim of this study is to monitor the fluoride ion (F-), as well as chloride ion (Cl-), variation in the Eastern Black Sea Basin streams, and to evaluate drinking water quality of these streams, with reference to national and international directives and guidelines. The water samples (240) were semimonthly collected from three surface water resources, namely from the Degirmendere and Galyan streams in Trabzon Province, the biggest city on the Southeastern Black Sea Coast with a total population of 768 417, and the Harşit Stream in Gümüşhane and Giresun provinces. The monitoring results have revealed that the average F-concentration had varied between 0.154 and 0.200 mg/l in the Degirmendere Stream and between 0.156 and 0.163 mg/l in the Galyan Stream, respectively. However, the treated stream waters had lower F-concentrations, varying between 0.010 and 0.080 mg/l, than the untreated stream waters. In the Harşit Stream, the average F-concentrations were at relatively higher values, which ranged from 0.211 to 0.296 mg/l, in the uppermost stations, however showed a steadily decreasing trend throughout the lowermost stations and fell from 0.230 to 0.141 mg/l due to the hydropower dam reservoirs, namely Torul, Kürtün, and Akköy, operated in the watershed. The average Cl-concentrations have varied between 2.00 and 6.48 mg/l. On the one hand, the waters from the Degirmendere, Galyan, and Harşit streams are classified as high quality, considering the upper threshold values of 1.5 mg F-/l and 250 mg Cl-/l. On the other hand, these streams can be regarded as the fluoride-poor water resources.
- MakaleYalnız künye2016Scopus SJRQ3Improvement of Current Density of Different Atmosphere-Sintered Y358 Superconductors
Başoğlu, M.; Düzgün, İ.
Y3Ba5Cu8O18 (Y358) which is the last family member of YBCO superconducting material was produced by a solid-state reaction technique. During the production process, superconducting samples were sintered in different atmosphere conditions. XRD measurements of the samples were performed. As a result of the measurements, it was seen that the superconducting phase peaks were formed. Hysteresis loops were calculated and analyzed in the framework of a critical state model including the Meissner current. Meissner currents (IM) were calculated as 0.0062, 0.0037, and 0.0119 for S100, S50, and S0, respectively. It was observed that S50 has the highest critical current density among the other calculated values.
AtıfScopus12WoS13OpenAlex13
İncele - MakaleYalnız künye2019Scopus SJRQ2Stability evaluation of the Gümüşhane-Akçakale cave by numerical analysis method
Alemdag, Selcuk; Zeybek, Halil Ibrahim; Kulekci, Gokhan
The Akçakale Cave is located in the vicinity of the Arsa neighborhood within the boundaries of the Akçakale village, Gümüşhane, Turkey. The cave is rich in cave formations (stalactite, stalagmite, cave pearl, cave flower, wall travertines). Thus, the appropriateness of opening the cave to visitors to boost tourism is of importance for the local and national economy. This study analyzes the stability of the Akçakale Cave using a numerical analysis method. According to the results of the total displacement analysis, there are displacements in the entrance, ceiling, and sidewalls of the cave ranging from 1 mm to 48 mm. It seems that the entrance, ceiling, and sidewalls of the cave face a high risk of local or sudden collapse. According to the deformation analysis of the length section of the cave examined, local collapses may occur especially in the first 75 m from the entrance of the cave. We believe that this situation would not carry a risk for the Arsa neighborhood for now. In conclusion, the results of the stability analysis and in-situ observations showed clear evidence of former and ongoing cave-ins (collapses) and the Akçakale Cave faces a high risk of local or sudden collapse. Thus, although the Akçakale Cave is one of the most prominent karst caves in Turkey, it seems to be not appropriate to open the cave to tourist visits.
AtıfScopus26WoS20OpenAlex21İncele - BildiriAçık Erişim2018Finite difference approximations of first order derivatives of complex-valued functions
Ashyralyyev, Charyyar; Öztürk, Beyza
In this study, we generalize the well-known finite difference method to compute derivatives of a real-valued function to approximate complex derivatives wz and wz for complex-valued function w. Exploring different combinations of terms, we derive several approximations to compute the first order derivatives of complex-valued function. The first, second, third and fourth order of accuracy finite differences to calculate derivatives are studied. Error analysis in test examples are carried out by using Matlab program.
AtıfWoS1OpenAlex1İncele - MakaleYalnız künye2019Scopus SJRQ2Dimethyl Sulfoxide Extract of Dianthus carmelitarum Induces S Phase Arrest and Apoptosis in Human Colon Cancer Cells
Turan, Ibrahim; Demir, Selim; Aliyazicioglu, Rezzan; Kilinc, Kagan; Ozer Yaman, Serap; Akbulut Cakiroglu, Kubra; Kanbolat, Seyda; Ayazoglu Demir, Elif; Mentese, Ahmet; Aliyazicioglu, Yuksel
Although several studies have investigated the cytotoxic effects of different Dianthus species, there has been only limited research into the cytotoxic effect of Dianthus carmelitarum. The purpose of this research was to evaluate the phenolic characterization and the cytotoxic effect of D. carmelitarum on human colon cancer (WiDr) cells and the possible mechanisms involved. Total polyphenolic contents (TPC) and phenolic characterization of the extract were evaluated using the Folin-Cioceltau method and reversed-phase high performance liquid chromatography (RP-HPLC), respectively. The cytotoxic activity of the extract was determined using the methylthiazolyldiphenyl-tetrazolium bromide (MTT) assay. The mechanism involved in the extract’s cytotoxic effect was then evaluated in terms of apoptosis and the cell cycle using flow cytometry, while mitochondrial membrane potential (MMP) was investigated using the fluorometric method. The TPC value of the extract was 784.8 ± 40.3 mg gallic acid equivalent per 100 g sample, and sinapic acid and benzoic acid were detected as major phenolics in the extract. D. carmelitarum extract exhibited a selective cytotoxic effect (3.6-fold) on WiDr cells compared to normal colon cells. The extract induced cell cycle arrest at the S phase and apoptosis via reduced MMP in WiDr cells. Phytomedical and nutraceutical applications of D. carmelitarum may represent promising approaches in the treatment of cancer.
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İncele - MakaleYalnız künye2020Scopus SJRQ2Effect of Turkish Propolis on miRNA Expression, Cell Cycle, and Apoptosis in Human Breast Cancer (MCF-7) Cells
Misir, Sema; Aliyazicioglu, Yüksel; Demir, Selim; Turan, Ibrahim; Hepokur, Ceylan
Enriched in flavonoid compounds, phenol acids, and terpene derivatives, propolis has been shown to regulate apoptosis signaling pathways and alter the expression of microRNAs (miRNAs). In the present study, it has been aimed to examine the effects of Turkish propolis on miRNA levels of breast cancer (MCF-7) cells, and its relationship with cell proliferation and apoptosis. Cytotoxic activity of ethanolic propolis extract (EEP) was evaluated using MTT assay. Mechanisms involved in the cytotoxic action of Turkish propolis in MCF-7 cells were investigated with regard to apoptosis and cell cycle using flow cytometry and western blot. Mitochondrial membrane potential (MMP) were evaluated by spectrofluorometric method. miRNA levels were detected by qRT-PCR method. EEP exhibited selective toxicity against MCF-7 cells compared to normal fibroblast cells. EEP increased the cell cycle arrest at the G1 phase. EEP elevated the apoptotic cell death through increasing pro-apoptotic protein levels (p21, Bax, p53, p53-Ser46, and p53-Ser15), decreasing MMP and altering the expression levels of specific tumor suppressors (miR-34, miR-15a, and miR-16-5p) and oncogenic (miR-21) miRNAs. These data support that Turkish propolis may be evaluated as a potential natural agent for new anticancer drugs in future.
AtıfScopus42WoS43OpenAlex56İncele - MakaleYalnız künye2020Scopus SJRQ2Determination of geological structures by geophysical and geotechnical techniques in Kırklartepe Dam Site (Turkey)
Sari, Mahmut; Seren, Aysel; Alemdag, Selcuk
In foundation research of engineering structures, application of geophysics methods before drilling work allows not only more economical studies but also a more detailed determination of underground sections. Especially in pre-feasibility studies on long tunnel routes, dam sites and lake areas, it has a vital importance in terms of structural safety to determine possible underground buried fault lines, lithology changes, anticlinal-synclinal structures and underground openings. By considering these effective factors, the alluvium/bedrock border and the positions of potential buried faults in the dam site and lake area in the Kırklartepe area of the province of Bayburt in northeastern Turkey were determined by comparison with geophysical and geotechnical methods. First of all, the resistivity of the dam axis location and the change of the Vp wave velocity by depth were determined by comparing the results between geophysical methods of electrical resistivity tomography (ERT) and seismic refraction tomography (SRT), respectively. Afterwards, from the foundation boreholes opened in the dam axis location, joint frequency and the other parameters determined by observations were obtained. With these parameters, 2-dimensional zoning profiles of the dam axis location were formed, and the alluvium-bedrock border and the locations of the buried faults were determined. Two potential faults in the NW-SE direction relative to the location of the dam axis were clearly revealed in the zoning profiles obtained in the ERT and SRT measurements. Additionally, the presence of these faults was determined as a result of examining the separation and joint frequency parameters from the drilling core samples collected from the BH_3 and BH_5 boreholes opened in the investigated area based on changes in the vertical and horizontal directions. In addition to these, in the ERT study, two potential faults other than the determined two were also detected. It was seen in the zoning profiles that these faults corresponded to right under the BH_2 borehole and 60 m SW of the BH_6 drilling. Consequently, in the zoning studies conducted at the examined site, the change in the lithology at the dam axis by depth (alluvium-bedrock border), lateral correlations of boreholes and potential faults were determined. It was recommended for the selected dam axis location to be constructed at a more suitable place in the NW direction in terms of engineering. Furthermore, with this study, it was revealed once again that it is highly essential to use geophysical and geotechnical together in conceptualizing large engineering structure projects.
AtıfScopus29WoS25OpenAlex30İncele - MakaleYalnız künye2021Scopus SJRQ1Investigation of wear behavior of graphite additive composite coatings deposited by micro arc oxidation-hydrothermal treatment on AZ91 Mg alloy
Küçükosman, Rıdvan; Emine Şüküroğlu, Ebru; Totik, Yaşar; Şüküroğlu, Süleyman
Composite coatings were deposited on AZ91 magnesium alloys by micro arc oxidation (MAO) and the MAO-hydrothermal treatment (HT). The MAO process of Mg alloys was performed in the silicate/phosphate-based electrolyte with graphite particles size of 5-10 and 75 µm and then the obtained samples were submitted to hydrothermal treatment at 150°C in the graphite-ethanol mixture. The structural and morphological properties of composite coatings were analized X-ray diffraction (XRD) and scanning electron microscopy (SEM). The wear resistance was examined with ball-on-disc tribometer. The addition of graphite to the MAO electrolyte solution increased the coating thicknesses and compactness and the surface morphologies acquired relatively a homogeneous appearance. The coating surfaces were enriched in graphite by HT and the wear test results showed that the wear resistance of the graphite-doped MAO-HT composite coatings was significantly improved.
AtıfScopus45WoS41OpenAlex38İncele - MakaleAçık Erişim2022Scopus SJRQ4Evaluation of potential rock falls with three-dimensional analysis: Example of Oltanbey and Hasanbey districts (Gümüşhane city center)
Alemdağ, Selçuk; Kara, Rasim Taylan; Bostanci, Hasan Tahsin
The central district campus of Gümüşhane, located on the Trabzon-Erzurum Highway, has a steep topography, and because of the effect of climatic and morphological structure, frequent rockfall events can cause loss of life and property from time to time. For these reasons, the slopes in some parts of the Oltanbey and Hasanbey districts of the central district of Gümüşhane, which pose a great threat in terms of rockfall potential, were chosen as the study area. In this study, three-dimensional rockfall analyzes were carried out using the RocPro3D program on the lines determined in the rockfall source zones with a high probability of rockfall. As a result of the analysis, it was determined that the rock blocks rolled from the O1, O2 and H1 source rock lines determined at the upper elevations of the study area threaten the settlements and road networks in Oltanbey and Hasanbey districts. With the 3D rockfall analysis, steel barrier was applied as a precautionary structure in the areas determined to be under the risk of rockfall, and the analyzes were carried out again considering the precautionary structures. By examining the results of the analyzes, the safest and most economical different barrier types have been proposed to eliminate the danger of rockfall.
AtıfScopus7WoS6OpenAlex9TR Dizin4
İncele - MakaleYalnız künye2021Scopus SJRQ2Innovative and polygonal trend analyses applications for rainfall data in Vietnam
Şan, Murat; Akçay, Fatma; Linh, Nguyen Thi Thuy; Kankal, Murat; Pham, Quoc Bao
It is a known fact that the size, frequency, and spatial variability of hydrometeorological variables will irregularly increase under the impact of climate change. Among the hydrometeorological variables, rainfall is one of the most important. Trend analysis is one of the most effective methods of observing the effects of climate change on rainfall. Recently, new graphical methods have been proposed as an alternative to classical trend analysis methods. Innovative Polygon Trend Analysis (IPTA), which evolved from Innovative Trend Analysis (ITA), is currently one of the proposed methods and it does not contain any assumptions. The aim of this study is to compare IPTA, ITA with the Significance Test and Mann-Kendall (MK) methods. To achieve this, the monthly total rainfall trends of 15 stations in the Vu Gia-Thu Bon River Basin (VGTBRB) of Vietnam have been examined for the period 1979–2016. The analyses show that rainfall tends to increase (decrease) in March (June) at nearly all stations. IPTA and ITA with the Significance Test are more sensitive than MK in determining the trends. While trends were detected in approximately 90% of all months in IPTA and ITA with the Significance Test, this rate was only 23% in the MK test. Although the arithmetic mean graphs in the 1-year hydrometeorological cycle are considerably regular at almost all stations, their standard deviations are relatively irregular. The most critical month for trend transitions between consecutive months for all the stations is October, which has an average trend slope of −1.35 and a trend slope ranging from −3.98 to −0.21, which shows a decreasing trend.
AtıfScopus81WoS71OpenAlex87İncele - MakaleYalnız künye2020Scopus SJRQ4Plasticity in behavior of Turkish malting barley cultivars under semi-arid and continental climatic conditions
Sirat, Abdulveli; Bahar, Bilge
This study aimed to select stable cultivars in terms of desired agronomic or quality criteria from among 15 two rowed barley cultivars that may remain stable in varying year conditions during 2014-2015 and 2015-2016. Furthermore, relationships among these traits were investigated. Some agronomical and quality traits of barley were affected by years and cultivars. Yield, yield components and some quality parameters were affected by the cultivars. Also, days to ripening was affected by years, cultivars, and year x cultivar interaction. Crude protein content (CPC) was significantly positive correlated with ASH during both seasons. Starch ratio (SR) showed significantly negative correlations with ASH and CPC during both seasons. ADF and NDF had significant positive strong correlation with one another and ASH during both years while they showed significant negative correlations with SR. The results show that technological properties are not affected by the interaction of cultivar x year; therefore, these stable cultivars can be readily used in malt or feed technology if their technological features are considered. For example, cv. Unver contained low ratios of ash, CPC, oil, soluble fiber and high SR in the malt industry; cv. Hasat which includes the opposite technological properties of cv. Unver, was found be suitable for use in feed technology.
- MakaleAçık Erişim2021Relationship between Political and Financial Risks in Turkey: Evidence from Fourier Cointegration Analysis Regarding Institutional Structures; [Türkiye’de Politik ve Finansal Riskler Arasındaki İlişki: Kurumsal Yapılara Dair Fourier Eşbütünleşme Analizinden Kanıt]
Çiçen, Yıldırım Beyazıt
Institutional structure and quality of management are the main elements that form the political risks. Political threats are directly linked to the institutional structure and the institutional design. Political risks increase if the government mechanisms fail. Increasing institutional quality reduces the political risks and positively impacts the financial risks. Monthly data from different indices are used to analyse the relationship between Turkey's political risks and financial risks between 2002 and 2015. According to the Fourier analysis of cointegration, there is a long-term relationship between the political and financial risks. Besides, as per the Fully Modified Ordinary Least Squares (FMOLS) findings and the Dynamic Ordinary Least Squares (DOLS) models, an increase in the political risk increases the financial risk.
AtıfScopus2WoS1OpenAlex1TR Dizin1İncele - MakaleYalnız künye2021Scopus SJRQ2In vitro Antioxidant and Cytotoxic Activities of Extracts of Endemic Tanacetum erzincanense Together with Phenolic Content by LC-ESI-QTOF-MS
Yapıcı, İsmail; Altay, Ahmet; Öztürk Sarıkaya, Beyza; Korkmaz, Mustafa; Atila, Alptuğ; Gülçin, İlhami; Köksal, Ekrem
In this study, phenolic composition, and in vitro biological activities of ethyl acetate (EAE) and methanol (ME) extracts obtained from the aerial parts of endemic Tanacetum erzincanense were investigated. Total phenolic and flavonoid content of the extracts were determined by Folin-Ciocalteu and aluminum chloride colorimetric methods, respectively. Antioxidant capacity of the extracts was evaluated over radical scavenging (DPPH and ABTS) and metal ion reducing power (FRAP and CUPRAC) tests. Individual phenolic compounds in ME was analyzed by high-performance liquid chromatography coupled to electrospray ionization quadrupole time-of-flight mass spectrometry (LC-ESI-QTOF/MS). Cell inhibitory potential of the extracts was tested against colorectal adenocarcinoma (HT-29), breast adenocarcinoma (MCF-7), and hepatocarcinoma (HepG2) cells by 2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide (XTT) assay. The results showed that ME contains higher TPC (64.4 mg GAE/g) and TFC (62.2 mg QE/g) than those of EAE (41.5 mg GAE/g and 40.0 mg QE/g). LC-ESI-QTOF/MS analysis revealed that ME is rich in phenolic compounds, namely, chlorogenic acid, apigenin, quercetin, luteolin, and diosmetin. Antioxidant assay results indicated that ME possess stronger activity than EAE and a power that competes with synthetic antioxidants. XTT assay results demonstrated that although both extracts displayed a considerable cytotoxicity against the tested cancer cell lines in a time and dose-dependent manner, ME expressed its selective inhibitory action towards MCF-7 cells with an IC50 value of 20.4 μg/mL for 72 h. These results may serve as a basis for further in vivo studies to examine the potential applications of T. erzincanense in food and pharmaceutical industries.
AtıfScopus27WoS24OpenAlex24İncele - MakaleAçık Erişim2021Scopus SJRQ2Effect of using chia seed powder on physicochemical, rheological, thermal, and texture properties of ice cream
Ürkek, Bayram
In this study, a mixture of salep and chia seed powder (CSP) at different ratios was used as a stabilizer in the production of ice cream. The effect of the mixtures was determined on the physical, chemical, color, rheological, thermal properties, instrumental hardness, and consumer acceptance properties of the ice cream samples. The viscosity, consistency coefficient, lightness (L*), whiteness index, (Formula presented.) (midpoint and offset), heat ice freezing, and melting values increased in the sample containing 0.6% salep and 0.2% CSP compared to the control sample and then decreased in accordance with the increment of CSP. The highest hardness value was determined in the sample containing CSP (0.8%). The control sample and sample containing 0.6% salep/0.2% CSP had the highest consumer acceptance scores. It was determined that 0.2% CSP could be used with salep to decrease the consumption of orchid species and to improve various quality properties of ice creams. Practical applications: Salep (Orchidaceae family) is generally used as a stabilizer in ice cream, and species of salep is been extinction day to day. This study indicated that the usage of the mixture of salep and chia seed powder can improve the quality properties of ice creams. Consequently, the mixture of salep (75%) and chia seed powder (25%) could be used as a stabilizer to reduce using salep and to protect species of salep to improve the quality properties of ice cream.
AtıfScopus20WoS20OpenAlex18İncele - MakaleAçık Erişim2020Scopus SJRQ1SOS5 gene-abscisic acid crosstalk and their interaction with antioxidant system in Arabidopsis thaliana under salt stress
Acet, Tuba; Kadıoğlu, Asım
SOS5 locus, encodes cell wall adhesion protein under salt stress conditions in plants, and it is required for normal cell expansion as well as for sustaining cell wall integrity and structure. However, it is still unknown how this gene locus-ABA cross-talk and interacts with the antioxidant mechanism under salt stress conditions. For this purpose, the study focused on mutant sos5-1 plant treated with ABA under NaCl stress and observed its growth and development as well as stomatal aperture, lipid peroxidation, proline, hydrogen peroxide (H2O2) and ABA contents, and some antioxidant enzyme activities. In addition, the expression levels of ABA related genes have been analysed by RT-PCR after stress application. According to findings, sos5-1 mutant plants treated with ABA under salt stress resulted in eliminated cellular damage compared to those which are solely exposed to salt stress; other observations include closing of stomata, decreased H2O2 content, increased amount of proline, and similarity with the wild type due to induced antioxidant enzyme activities. Besides, both ABA biosynthetic and inducible gene expressions of the mutant plant under salt stress were lower compared to the control, and catabolism gene expression was higher. As a result, SOS5 gene in synergy with ABA, scavenge the ROS by stimulating antioxidant system, leads to an increase in stress related gene expressions and thus contributes to salinity tolerance. This study is significant in the way that it shows how SOS5 gene locus, under salt stress conditions, interacts with antioxidant system in sustaining cell wall integrity.
AtıfScopus21WoS20OpenAlex21İncele - MakaleAçık Erişim2021Scopus SJRQ3Evaluation of ultrasonication and agitation extraction methods at different conditions on the phenolic composition and antioxidant activities of mammillaria prolifera
BURNAZ, NESIBE ARSLAN
The study focuses on the comparative evaluation of extraction methods (ultrasonication and agitation) based on phenolic composition and antioxidative activities of Mammillaria prolifera and it is the first report on this subject. The effects of extraction conditions of temperature (25° and 60°), time (15, 30 and 60 min) and solvent type (water and 70 % and 100 % methanol) on total phenolic compounds, 2,2'-azinobis( 3-ethylbenzothiazoline-6-sulfonic acid) and 2,2-diphenyl-1-picrylhydrazyl anti-radical activities and ferric ion reducing antioxidant power values were determined. Moreover, the phenolic acid compositions of the extracts were investigated by high performance liquid chromatography. The extracts prepared with the ultrasonic method showed stronger antioxidant activity than those prepared with agitation methods. In both methods total phenolic compounds and antioxidant activity values were the lowest in the aqueous extracts. The results showed a positive correlation observed between total phenolic compounds and antioxidant activities of the studied extracts. The optimal conditions for the extraction of phenolic compounds from Mammillaria prolifera were found as 60 min extraction time, 60° extraction temperature and 70 % methanol concentration by using the ultrasonication method. Notably, protocatechualdehyde, gallic acid, para hydroxy benzoic acid and ferulic acid were identified in Mammillaria prolifera by using the high performance liquid chromatography-diode array detector system and 14 phenolic standards. Consequently, Mammillaria prolifera cladodes can be used in food or pharmaceutical practices, as a potential natural source of antioxidants.
AtıfScopus6WoS6OpenAlex7İncele - MakaleAçık Erişim2019Scopus SJRQ2A fast GMPPT algorithm based on PV characteristic for partial shading conditions
Başoğlu, Mustafa Engin
Photovoltaic (PV) modules experience some partial shading conditions (PSC) due to some various factors. In that kind of a condition, a few maximum power points (MPPs) possibly appear on the power-voltage (P-V) curve, which increases the tracking difficulties. It is known that maximum power point tracking (MPPT) may not be realized by hill climbing (HC) based conventional MPPT algorithms under PSCs. In this context, this paper presents a novel micro converter based algorithm that was developed by using P-V characteristics of PV modules. Unlike voltage or duty ratio scanning techniques, this paper introduces a new deciding method to determine the correct global MPP (GMPP) region. For this, the proposed method uses some duty ratios that were calculated corresponding to each MPP region. Thus, the initialization of duty ratio is done properly, which results in high tracking speed and accurate tracking of the GMPP. The other advantages of the proposed algorithm are structural simplicity, less computational burden, and ease of implementation with a basic microcontroller. The simulation results show that this algorithm has fast tracking capability and it manages to track GMPP for PSCs correctly, since it includes an artificial scanning procedure. Single ended primary inductance converter (SEPIC) is built in order to validate the proposed global maximum power point tracking (GMPPT) algorithm. The performance of the proposed GMPPT technique is verified by experimental studies. The results show that the proposed GMPPT technique is fast by up to five times than an adaptive full scanning strategy and improved IC algorithm. Furthermore, the proposed algorithm can be commercially used in micro converters, since it is compatible with small number of bypass diodes in a module.
AtıfScopus13WoS7OpenAlex13İncele - MakaleYalnız künye2021Scopus SJRQ4Effect of different warm up protocols (deep feelings, massage, dynamic traction) on different levels of blood lactate and anaerobic power of athlete students
Sajedi, Heidar; Bas, Mustafa; Aydın, Elif
The aim of this study is to investigate the effect of different warm-up protocols (deep feelings, massage, dynamic traction) on different levels of blood lactate and anaerobic power of athlete students. The present study was quasi-experimental, with pre and post-test design and a control group and also three experimental groups. After announcing, 36 students who have had at least three years of professional sports experience were chosen among qualified students and they were set randomly in four groups of deep feelings, massage, dynamic traction, and control. Wingate test was used to measure anaerobic power. The 894E Monark performed the test Ergo medic as a Wingate test. The blood lactate of the participants of each group were measured in separate sessions using the German Scott Lactometer (using hand blood sample). We used two methods of petrissage and testament in the massage group. In the deep feelings group, the 11+ protocol designed by FIFA to improve performance and prevent player injury was used to warm up and five major muscles (Quadriceps femoris muscle, Hamstring, Hip flexor muscle, Hip Extensor muscle, Ankle Extensor) were stretched. The results show that there was a significant difference between the results of an anaerobic power test and blood lactate in those four groups. Based on the Tuki test and attention to the mean of post-test records compared to the pre-test, the two groups of dynamic traction and deep feelings compared to the control group had significantly welled performance in anaerobic power and blood lactate (P<0/05) and there was no significant difference in the massage group compared to the control group (P>0/05). As a result, it can be said that all three methods of warming up including dynamic traction, massage, deep feelings improve the performance of the participants in the anaerobic power and blood lactate test compared to the control group and performing the students of deep feelings and dynamic traction group in terms of anaerobic power and blood lactate is better than massage group.
- MakaleAçık Erişim2021Scopus SJRQ3Investigation of the removal of sulfamethoxazole drug waste from aqueous solutions under the effect of zinc oxide/montmorillonite nanocomposite by photocatalytic ozonation process
Özyürek, Işıl Nihan; Kıranşan, Murat; Karaca, Semra
In this study, the synergistic effect of photocatalysis and ozonation processes to degrade the sulfamethoxazole (SMX), one antibiotic pharmaceutical compound, has been studied through the influence of main operational variables such as zinc oxide/montmorillonite (ZnO/MMT) dos-age, SMX initial concentration, ozone flow rate, pH and the addition of organic and inorganic scavengers. Synthesized ZnO nanoparticles were immobilized on the montmorillonite surface to prepare ZnO/MMT catalyst as a photocatalyst. The catalyst was characterized by X-ray fluo-rescence, X-ray diffraction, scanning electron microscope, high-resolution transmission electron microscope and N2 adsorption/desorption. The highest SMX degradation efficiency (80.84% for 30 min of reaction time) was obtained for the photocatalytic ozonation process compared to adsorption, single ozonation, catalytic ozonation, and photolysis. ZnO/MMT was more effective photocatalyst according to ZnO, indicating its usability as a promising photocatalyst for the removal of organic contaminants in aqueous solutions. The reduced degradation efficiency with the addition of organic and inorganic scavengers showed the important role of the photo-produced radicals and holes as well as direct ozonation in SMX degradation. A mechanism is also proposed for photocatalytic ozonation degradation by using the gas chromatography-mass spectroscopy (GC-MS) analysis method. Finally, several by-products were identified by GC-MS analysis, which allowed to depict a possible mechanism for the sulfamethoxazole degradation.
AtıfScopus9WoS7OpenAlex10İncele - MakaleYalnız künye2022Scopus SJRQ3Development of Homemade Hazelnut Milk-based Beverage
Aysu, Şühedanur; Akıl, Fatoş; Çevik, Edanur; Kılıç, Mustafa Emin; İlyasoğlu, Huri
A homemade hazelnut milk-based beverage was prepared from hazelnut milk with raisins. The proximate composition, physicochemical and sensorial properties, total phenolic content (TPC), antioxidant activity, and fatty acid compositions of the beverage samples were determined. The properties of the three different preparations of homemade hazelnut milk with raisins (1%, 3%, and 5%) were compared with the control sample without raisins. The main macronutrient was fat (6.3‒7.3%) in the hazelnut milk beverage followed by carbohydrate (3‒3.5%) and protein (2.2‒2.5%). The addition of raisins to the beverage formulation increased the flavor and general acceptability scores. It also improved the TPC and antioxidant capacity. The TPC of the developed beverage samples ranged from 65 to 97 mg/L. The fatty acid composition was rich in monounsaturated fatty acids as mainly oleic acid (>80%). The hazelnut milk beverage may have potential as a functional beverage in a daily diet to provide nutrients and energy.
AtıfScopus15WoS12OpenAlex16İncele
