Yayınlar
Koleksiyondaki öğeler
- MakaleYalnız künye2022Scopus SJRQ4Complementary and Alternative Medicine Used by Adolescents in Premenstrual Syndrome. A Cross-Sectional Study
Elkoca, Ayşe; Kahraman, Beliz Yekeler; Ozcan, Handan; Aydin, Muhammet Ali; Karakas, Sevda
Study Objectives: This study was conducted to determine the treatment methods used by adolescents with premenstrual syndrome. Premenstrual syndrome is a common disorder among women of childbearing age. It influences women’s quality of life and economic and social performance. In addition to the conventional treatments by modern medicine, women frequently prefer complementary and alternative medicine practices to cope with the problem. Methods: Quantitative and descriptive design study and 367 people were icluded in this study. A questionnaire consisting of three parts was used to collect the data. The first part includes sociodemographic characteristics and information about the menstrual cycle, the second part is the “Premenstrual Syndrome Scale”, the third part is the “Complementary and Alternative Medicine Scale (CAMS)”. Results: 43.3% of the participants had a family history of PMS, and 64.9% had regular menstrual cycles. 23.2% consulted a physician for their complaints, 10.9% used medication for their complaints. The most preferred complementary and alternative medicine herbal supplementary was green tea (49.5%), chamomile (32.5%), sage (23.8%), and thyme (18.6%). The most used mind-body practices are prayer (65.5%), exercise (54.4%), and namaz (32.4%). Conclusion: It is concluded that 73% of adolescents diagnosed with premenstrual syndrome used complementary and alternative medicine practices, so it is necessary to investigate their effectiveness.
- MakaleAçık Erişim2021Scopus SJRQ3Statistical behaviours of earthquake occurrences in the Central Anatolian Region of Turkey: region-time-magnitude analyses
Öztürk, Serkan
The main objective of this work is to make detailed region-time-magnitude analyses by describ-ing the statistical behaviours of earthquakes in the Central Anatolian Region of Turkey. In this scope, several seismic and tectonic parameters such as Mcomp, b-value, Dc-value, Z-value, recurrence times and annual probabilities were evaluated. For the analyses, a homogeneous catalogue including 10,146 earthquakes with 1.0 ≤ Md ≤ 5.7 between 30 July 1975 and 29 December 2018 was used and spatio-temporal changes of earthquake behaviours were mapped for the beginning of 2019. Earthquake magnitudes varied from 1.9 to 3.0 on average, and hence Mcomp was considered to be 2.6. The b-value was calculated as 1.26 ± 0.07, and this relatively large value indicates that small-magnitude events are dominant. The Dc-value was computed as 1.31 ± 0.03. This small value means that distances between epicentres approach the diameter of the cluster, and seismic activity is more clustered at smaller scales or in larger regions. The spatio-temporal analyses of recurrence times suggest that the Central Anatolian Region has an intermediate/long-term earthquake hazard in comparison to occurrences of strong earthquakes in the short term. Several anomaly regions of a small b-value and a large Z-value were found in and around the Tuzgölü Fault Zone, Central Anatolian Fault Zone, Salanda fault and Niğde fault at the beginning of 2019. Thus, a combination of the regions with a lower b-value, a higher Z-value and also moderate recurrence times may give significant clues for the future possible earthquakes, and detected regions may be thought to be the most likely areas for strong/large events in the Central Anatolian Region.
AtıfScopus2WoS1OpenAlex3
İncele - MakaleAçık Erişim2020Scopus SJRQ1Machine learning and classical forecasting methods based decision support systems for covid-19
Ünlü, Ramazan; Namli, Ersin
From late 2019 to the present day, the coronavirus outbreak tragically affected the whole world and killed tens of thousands of people. Many countries have taken very stringent measures to alleviate the effects of the coronavirus disease 2019 (COVID-19) and are still being implemented. In this study, various machine learning techniques are implemented to predict possible confirmed cases and mortality numbers for the future. According to these models, we have tried to shed light on the future in terms of possible measures to be taken or updating the current measures. Support Vector Machines (SVM), Holt-Winters, Prophet, and Long-Short Term Memory (LSTM) forecasting models are applied to the novel COVID-19 dataset. According to the results, the Prophet model gives the lowest Root Mean Squared Error (RMSE) score compared to the other three models. Besides, according to this model, a projection for the future COVID-19 predictions of Turkey has been drawn and aimed to shape the current measures against the coronavirus.
AtıfScopus16WoS12OpenAlex15İncele - MakaleYalnız künye2014Scopus SJRQ1Investigation of freeze-thaw effects on mechanical properties of fiber reinforced cement mortars
Çavdar, Ahmet
Fibers are used for improving some properties of conventional concrete (which is a brittle material) such as tensile strength, abrasion resistance, absorption and crack control. This study investigates the usability of fibers against the harmful effects of freeze-thaw cycles on cement mortars. For this objective, five different types of fibers, i.e., Polypropylene (PP), Carbon (CF), Aramid (AR), Glass (GF) and Poly vinyl alcohol (PVA) in four different ratios (0.0%, 0.4%, 0.8% and 1.2%) were added to cement mortars along with an amount of air agent. These samples were then subjected to five different freeze-thaw cycles (0, 25, 50, 75 and 100). Thus, mechanical behaviors were investigated under freeze-thaw effects. The most important results of the study are summarized; the fibers increase flexural strength and deflection ability of the samples while decreasing compressive strength, dynamic modulus of elasticity and specific mass. The highest flexural strength was obtained with a 1.2% addition of CF fiber for the samples in normal conditions. The mechanical properties of the samples subjected to repetitive freeze-thaw cycles were also investigated; the best flexural strength was provided with 1.2% CF addition, while the highest dynamic modulus of elasticity was obtained with a 1.2% PP addition.
AtıfScopus123WoS103OpenAlex122İncele - BildiriYalnız künye2011Comparison of state space controllers with two different observers on an identified water tank system
Özden, Talat; Ciba, Osman Nuri; Okumuş, Halil Ibrahim
In this paper, identification of a water tank system is performed, and controller and observer for identified system are constructed. Identification is done via Linear Black Box Identification which consists of unknown parameters; need to be estimated from measured data. Firstly, PRBS Signal is built using data, which is achieved by analyzing step response of the plant and considering that the change in the input signal may not be too large since we are going to use a linear model to indentify a nonlinear process. Considered linear models are ARX, ARMAX and OE, whose results are compared using different criteria such as simulation, correlation, and pole-zero plots. And the chosen model which is an Armax model will be given explaining the reasons why it is chosen. In the next step, controllability and observability tests are performed for chosen Armax model and observer and controller designs are performed. Predictive and filtering observers are constructed to observe the system and state space feedback controllers with and without integrators are constructed to control the system. Depending on the achieved observers and controllers, response of real system and simulation are compared to find best controller and best observer for the water tank system.
- MakaleAçık Erişim2022Scopus SJRQ1The image of nursing among nursing and other healthcare professional university students: A mixed-method study
Apaydin Cirik, Vildan; Gül, Uğur; Aksoy, Bahar
Aim: This study had three objectives: (1) determining the image of nursing in the eyes of undergraduate health sciences students; (2) identifying factors affecting that image; and (3) evaluating students’ views and experiences regarding that image. Background: If healthcare students perceive nursing positively, it may result in directing future generations to nursing, and improving nursing, and reducing the need for nurses. Design: This study adopted an explanatory sequential design with participant selection variant. The design involved data collection in two consecutive phases. Methods: A mixed-method design using quantitative data and qualitative interviews was used. In the quantitative phase, a descriptive and cross-sectional research method was used. The qualitative phase was based on phenomenological research. The quantitative portion was performed with 1556 participants in their second, third or fourth year during the 2019–2020 academic year. Students were from the nursing, emergency and disaster management, nutrition and dietetics, occupational health and safety, health management, and social work departments. The qualitative portion was performed with 29 participant volunteers. Participants were interviewed on the phone. The data were collected using an introductory information form, a nursing image scale, and semi-structured interviews. The quantitative data were analyzed using descriptive statistics and the independent-samples t-test, Mann-Whitney U test, one-way ANOVA, and stepwise linear regression. The quantitative data were analyzed using thematic analysis. Results: There were significant relationships between participants' nursing image scale total scores and their department (p < 0.001), education year (p = 0.014), age (p = 0.032) and desire to recommend the nursing profession (p < 0.001). Nursing image scale total score was significantly higher in nursing departments than in other departments. Second-year participants and 18–20-year-olds had higher total scores than fourth-year participants and 21–23-year-olds, respectively, and those who would recommend the nursing profession had higher total scores than those who would not recommend it (p < 0.05). Analysis of the qualitative data produced six main themes: perceptions of the nursing profession, perceived nursing figure, nurse knowledge, relationship with healthcare professionals, reason for preference and job gender. Conclusion: This study employed a mixed-method design involving both quantitative and qualitative stages. The results highlighted the image of nursing and its significance in the eyes of prospective healthcare professionals. Detecting nursing image early can increase professional training and improve the professional image of nursing. We should take into account the factors that negatively affect the image of nursing to plan nursing education better in the future.
AtıfScopus26WoS21OpenAlex25
İncele - MakaleYalnız künye2021Scopus SJRQ2Assessment of the concentration and environmental impacts of potential hazardous elements in coalfields in Northeastern Turkey
Saydam Eker, Ç.; Sipahi, F.; Akpınar, I.
To investigate the impact of potential hazardous element (PHE) contamination on environmental and human health, the coaly shale, coal and shale coal outcrops of four sites, namely Ozyurt, Tarhanas, Kayadibi (Gümüşhane), and Manas (Bayburt), were selected as sampling areas for this study. The samples were analyzed using inductively coupled plasma (ICP) emission spectrometry and inductively coupled plasma-mass spectrometry (ICP-MS) and a Rock–Eval 6 analyzer with a total organic carbon module. The enrichment factor (EF), potential ecological risk index (RI), and potential health risk index (HI) assessment models were used to evaluate the environmental and health risks in the vicinity of the coals. Results indicated that the mean concentrations of PHEs extensively changed and even exceeded the upper continental crust and world average values of low-rank coal concentrations. The assessment of the EF, RI and HI models revealed that the contamination levels of As, Hg, and Cd were higher than those of Pb, Co, Ni, V, and Mo. The evaluation of the EF revealed that the largest and lowest contamination levels of As, Hg, and Cd were observed in Ozyurt (29) and Kayadibi (1.8), Manas (9.6) and Kayadibi (1), and Kayadibi (5.6) and Tarhanas (1.9), respectively. A high-potential ecological risk was present in Ozyurt and Manas, whereas a considerable risk exists in Kayadibi and Tarhanas. The potential health risk values of As for children in Ozyurt, Tarhanas, and Manas and adults in Ozyurt were excessively high. This finding suggested the possibility of transferring the contamination from the coal, shale coal, and coaly shale outcrops
AtıfScopus5WoS4OpenAlex6İncele - MakaleAçık Erişim2022Scopus SJRQ4Analysis and assessment of daily and seasonal photovoltaic heat island effect on Sekbandemirli rural region by local weather data records; [YEREL METEOROLOJIK VERI KAYITLARI ILE SEKBANDEMIRLI KIRSAL BÖLGESINDE GÜNLÜK VE MEVSIMSEL FOTOVOLTAIK ISI ADASININ INCELENMESI VE DEǦERLENDIRILMESI]
Demirezen, Emre; Ozden, Talat; Akinoglu, Bulent G.
Photovoltaic Power Plants have a considerable share among solar energy conversion technologies toward environmentally sustainable and economically feasible electricity production. However, when a rural region's land surface formed by natural soil types is covered by a Photovoltaic Power Plant (PVPP)'s dark-colored solar modules in large numbers, an artificial albedo (reflectivity) change is expected on that surface. Because of the heat exchange between these modules and the air surrounding them due to albedo alteration, the region's natural weather conditions may experience Photovoltaic Heat Island Effect (PVHIE) as a result of external and time-dependent air temperature oscillations caused by the warming-cooling cycles of solar modules. To observe and analyze a possible PVHIE trend, it has been conducting a field study project since October 2017 for a PVPP near the Sekbandemirli rural region in the Kutahya city of Turkey. The weather data, including air temperature and wind (direction and speed) at every 10-minute and hourly intervals, are collected by the three weather monitoring stations installed at the specific locations inside and outside the PVPP field. The plant's hourly average power output and module temperature data can also be monitored. After conducting statistical, correlational, and graphical analyses, the results show some temporal PVHI formations at the PVPP field center daily and on a seasonal basis. The plant center's air temperature tends to be warmer (up to the 6°C difference) during daytimes and colder (up to the (-3)°C difference) during nighttimes.
AtıfScopus1
İncele - Kitap BölümüYalnız künye2021Understanding Environmental Policy After Covid-19: An Introduction
Uğur, Ömer; Cengiz, Emre
- MakaleYalnız künye2015Scopus SJRQ1Primary growth parameters of three alfalfa cultivars adapted to highland climatic conditions
Seker, H.; Yolcu, H.; Acikgoz, E.
An irrigated field study was conducted to determine the relative importance and inter-relationships of growth parameters of three dormant alfalfa (Medicago sativa L.) cultivars grown in the highlands of Eastern Anatolia, Turkey, in 2000-2003. The fast-growing cultivar Savas had the greatest dry matter (DM) yield at the final sampling date with the greatest mean crop growth rate. In addition to a greater relative growth rate (RGR), this cultivar had more stem branching and greater leaf area in the canopy, which resulted in greater leaf area index (LAI) and greater leaf area duration. Despite the considerable increase in leaf area ratio (LAR: leaf area per unit shoot DM), the reduction in RGR of all cultivars over time was the result of a large decline in net assimilation rate (NAR) due to increasing specific leaf area (SLA). Intracultivar variation in the RGR of alfalfa is mainly determined by NAR and SLA, and both were significantly higher for Savas than the other two cultivars. The relative importance of NAR and SLA to RGR changed due to increasing self-shading as the LAI of the canopy increased, creating a trade-off between NAR and SLA.
AtıfScopus3WoS2OpenAlex5İncele - MakaleAçık Erişim2013Scopus SJRQ1Petrogenesis of the late Cretaceous Turnagöl intrusion in the eastern Pontides: Implications for magma genesis in the arc setting
Kaygusuz, Abdullah; Sipahi, Ferkan; Ilbeyli, Nurdane; Arslan, Mehmet; Chen, Bin; Aydinçakir, Emre
A series of Cretaceous plutons is present in the eastern Pontides of northeastern Turkey. The Turnagöl intrusion is the least studied and, thus, the least understood plutons in the orogen. This intrusion consists of hornblende-biotite granodiorites emplaced at 78 Ma based on LA-ICP-MS U-Pb zircon dating. It is of sub-alkaline affinity, belongs to the medium- to high-K calc-alkaline series, and displays features typical of I-type granites. The rocks of the intrusion are enriched in large-ion lithophile elements and light rare earth-elements with negative Eu anomalies (Eu/Eu* = 0.69-0.82), but are deficient in high-field-strength elements. They have a small range of ( 87Sr/86Sr)i (0.7060-0.7063), ÉNdi(-2.6 to -3.1), and δ18O (+8.1 to +9.1) values. Their Pb isotopic ratios are 206Pb/204Pb = 18.63-18.65, 207Pb/ 204Pb = 15.62-15.63, and 208Pb/204Pb = 38.53-38.55. The fractionation of plagioclase, hornblende, and Fe-Ti oxides had key functions in the evolution of the Turnagöl intrusion. The crystallization temperatures of the melts ranged from 758 to 885 C as determined by zircon and apatite saturation thermometry. All these characteristics, combined with the low values of K2O/Na2O and (Na 2O + K2O)/(FeOt + MgO + TiO2), as well as the high values of (CaO + FeOt + MgO + TiO2), suggest an origin by dehydration melting from a metabasaltic lower crustal source.
AtıfScopus54WoS49OpenAlex60İncele - MakaleAçık Erişim2014Scopus SJRQ1The Arabidopsis thaliana FASCICLIN LIKE ARABINOGALACTAN PROTEIN 4 gene acts synergistically with abscisic acid signalling to control root growth
Seifert, Georg J.; Acet, Tuba; Xue, Hui
Background and Aims The putative FASCICLIN-LIKE ARABINOGALACTAN PROTEIN 4 (At-FLA4) locus of Arabidopsis thaliana has previously been shown to be required for the normal growth of wild-type roots in response to moderately elevated salinity. However, the genetic and physiological pathway that connects At-FLA4 and normal root growth remains to be elucidated. Methods The radial swelling phenotype of At-fla4 was modulated with growth regulators and their inhibitors. The relationship of At-FLA4 to abscisic acid (ABA) signalling was analysed by probing marker gene expression and the observation of the At-fla4 phenotype in combination with ABA signalling mutants. Key Results Application of ABA suppresses the non-redundant role of At-FLA4 in the salt response. At-FLA4 positively regulates the response to low ABA concentration in roots and is required for the normal expression of ABA-and abiotic stress-induced genes. The At-fla4 phenotype is enhanced in the At-abi4 background, while two genetic suppressors of ABA-induced gene expression are required for salt oversensitivity of At-fla4. Salt oversensitivity in At-fla4 is suppressed by the CYP707A inhibitor abscinazole E2B, and salt oversensitivity in At-fla4 roots is phenocopied by chemical inhibition of ABA biosynthesis. Conclusions The predicted lipid-anchored glycoprotein At-FLA4 positively regulates cell wall biosynthesis and root growth by modulating ABA signalling.
AtıfScopus83WoS75OpenAlex89İncele - MakaleYalnız künye2012Scopus SJRQ2The determinations of fruit features in the Tombul hazelnut (Corylus avellana L.) clone
Kalkişim, Özgün; Balik, Hüseyin Irfan
This study was carried out between Çarşi{dotless}başi{dotless}/Trabzon and Piraziz/Giresun region which is assumed to be the best ecology for Tombul hazelnut cultivation. Visual pre-selection was performed in the region and the clones that may exhibit different characteristics were detected and marked. Later fruit samples were taken from those clones at the time of harvest and the superior clones were determined as a result of the examinations performed on the fruits. The efficiency and fruit features were analyzed for selected Tombul hazelnut clones. The study showed that the differences between efficiency, yield, kernel weight, fruit weight, shell thickness and bundle fruit number were significant (P<0.05) among Tombul hazelnut clones. On the other hand, differences of navel cavity, splitting fruit ratio, whitening and healthy kernel ratio among clones were not significant. The highest and lowest values of efficiency were 13.45 and 168.47 g/cm2, respectively, for clones 61V11 and 28M16, yield was 45.11-54.07%, respectively, for clones 61V11 and 28M17, kernel weight 0.89-1.19 g, respectively, for clones 61V11 and 28G16, fruit weight 1.67-2.19 g, respectively, for clones 61B08 and 28ES04, shell thickness 0.89-1.10 mm, respectively, for clones 28G08 and 28ES04 and bundle fruit number 2.15-4.38, respectively, for clones 61B08 and 28EY12. The clones 28ES01 (53.86), 61Ç07 (53,88%), 61V25 (53.90%) and 28M17 (54.07%) had more superior characteristics in terms of yield compared to others.
AtıfScopus1WoS1İncele - MakaleAçık Erişim2011Scopus SJRQ2Quality characteristics of registered cultivars and advanced lines of durum wheats grown in different ecological regions of Turkey
Sakin, Mehmet A.; Sayaslan, Abdulvahit; Duzdemir, Oral; Yuksel, Ferhat
In this study, pastaquality- associated characteristics of 25 durum wheat genotypes were investigated. Durum wheat genotypes consisted of 13 advanced experimental lines and 12 registered cultivars that were grown in three different locations of Turkey for 2 yr. Genotype, location, year and their interactions were found to be statistically significant in terms of all investigated quality characteristics. Mean quality parameters for the genotypes varied as follows: yellowberry kernel 1.7-6.1%, pigment content 3.67-8.31 mg kg-1, lipoxygenase (LOX) activity 12.9-27.9 EU g-1, protein content 10.8-11.8% (14% mb), gluten index (GI) 12-61, sodium dodecyl sulphate-sedimentation volume 17.3-28.7 mL, specific sedimentation volume 1.60-2.52 mL. Of the genotypes, 10 contained γ-gliadin 45 and six γ-gliadin 42 proteins. Except for Zenit, none of the registered cultivars and advanced experimental lines investigated in this study were able to meet simultaneously the requirements for high-quality pasta products; yet certain experimental lines prevailing in specific quality characteristics, such as Line-Gdem- 2, Line-Gdem-12 and Line-20, may be used for further breeding purposes. The results of this study also imply that grain yield and quality should be taken collectively into consideration in wheat breeding programs.
AtıfScopus14WoS12OpenAlex20İncele - MakaleYalnız künye2011Scopus SJRQ3Characteristics of seismic activity in the Western, Central and Eastern parts of the North Anatolian Fault Zone, Turkey: Temporal and spatial analysis
Öztürk, Serkan
Characteristics of seismic activity along the North Anatolian Fault Zone are analyzed between 1970 and 2010. Magnitude completeness changes between 2.7 and 2.9 in the North Anatolian Fault Zone. The frequency-magnitude distribution of earthquakes is well represented with a b-value typically close to 1. A clear decrease in temporal distribution of b-value is observed before the strong main shocks. Correlation dimension values are relatively large and the seismic activity is more clustered at larger scales in the North Anatolian Fault Zone. A statistical assessment is made in order to detect the current seismic quiescence anomalies in the beginning of 2010. Eight significant anomalous zones throughout the North Anatolian Fault Zone are detected. These are centered at: (1) 41.08°N-28.58°E (around Silivri), (2) 41. 47°N-29.51°E (in the Black Sea), (3) 40.69°N-29.78°E (including Izmit), (4) 40.26°N-26.46°E (around Gelibolu, Canakkale), (5) 40.59°N-31.03°E (including Duzce fault), (6) 40.86°N-35.30°E (around Amasya), (7) 39.48°N-39.74°E (around Erzincan), and (8) 39.06°N-40.50°E (around Bingol).
AtıfScopus45WoS37İncele - MakaleYalnız künye2012Scopus SJRQ3Effects of plant growth-promoting rhizobacteria on some morphologic characteristics, yield and quality contents of Hungarian vetch
Yolcu, Halil; Gunes, Adem; Gullap, M.Kerim; Cakmakci, Ramazan
This research study was designed to determine the effects of plant growth-promoting rhizobacteria (PGPR) on some morphological characteristics, yield and quality contents of Hungarian vetch (Vicia pannonica Crantz.) in the Kelkit Aydi{dotless}n Dogan Vocational Training School Research Area during 2008-2009 and 2009-2010 plant growing season. The research consisted of a control (without plant growth-promoting rhizobacteria) and 12 different plant growth-promoting rhizobacteria (Pseudomonas putida PPB310, Bacillus cereus BCB51, Pantoea agglomerans PAB58, Pseudomonas fluorescens PFC82, Pseudomonas fluorescens PF84, Arthrobacter mysorens AM235, Paenibacillus polymyxa PP315, Pantoea agglomerans PAA362, Bacillus atrophaeus BA361, Bacillus megaterium BMA424, Bacillus megaterium BMA479 and Bacillus subtilis BS521) seed inoculations and three replicates. Some morphological characteristics (stem diameter, plant height and leaf number), dry matter yield, crude protein, crude protein yield, ADF, NDF, macro and micro-elements (B, Ca, Na, K, Mg, P, S, Cu, Fe, Mn and Zn) were tested in the research study. According to the results of the research study, some of the PGPR treatments had positive effect on morphological characteristics (especially PFC82, BA361 and PAB58), dry matter yield (very little PAA362), crude protein (very little PFC82), ADF and NDF (especially BA361) and macro and micro-elements (especially PAA362) of Hungarian vetch.
AtıfScopus27WoS24İncele - MakaleYalnız künye2012Scopus SJRQ1Geochronological evidence and tectonic significance of Carboniferous magmatism in the southwest Trabzon area, eastern Pontides, Turkey
Kaygusuz, Abdullah; Arslan, Mehmet; Siebel, Wolfgang; Sipahi, Ferkan; Ilbeyli, Nurdane
The northern and southern zones of the eastern Pontides (northeast Turkey) contain numerous plutons of varying ages and compositions. Geochemical and isotopic results on two Hercynian granitoid bodies located in the northern zone of the eastern Pontides allow a proper reconstruction of their origin for the first time. The intrusive rocks comprise four distinct bodies, two of which we investigated in detail. Based on LA-ICP-MS U-Pb zircon dating, the Derinoba and Kayadibi granites have similar 206Pb/ 238U versus 207Pb/ 235U Concordia ages of 311.1 2.0 and 317.2 3.5 million years for the former and 303.8 1.5 million years for the latter. Aluminium saturation index values of both granites are between 0.95 and 1.35, indicating dominant peraluminous melt compositions. Both intrusions have high SiO 2 (74-77 wt.%) contents and show high-K calc-alkaline and I-to S-type characteristics. Primitive mantle-normalized element diagrams display enrichment in K, Rb, Th, and U, and depletion in Ba, Nb, Ta, Sr, P, and Ti. Chondrite-normalized rare earth element patterns are characterized by concave-upward shapes and pronounced negative Eu anomalies with L acn/Y bcn=4.6-9.7 and E ucn/Eu*=0.11-0.59 (Derinoba), and L acn/Y bcn=2.7-5.5 and E ucn/Eu*=0.31-0.37 (Kayadibi). These features imply crystal-melt fractionation of plagioclase and K-feldspar without significant involvement of garnet. The Derinoba samples have initial Nd values between-6.1 and-7.1 with Nd model ages and T DM between 1.56 and 2.15 thousand million years. The Kayadibi samples show higher initial Nd (I) values,-4.5 to-6.2, with Nd model ages between 1.50 and 1.72 thousand million years. This study demonstrates that the Sr isotope ratios generally display negative correlation with Nd isotopes; Sr isotope ratios were lowered in some samples by hydrothermal interaction or alteration. Isotopic and petrological data suggest that both granites were produced by the partial melting of early Palaeozoic lower crustal rocks, with minor contribution from the mantle. Collectively, these rocks represent a late stage of Hercynian magmatism in the eastern Pontides.
AtıfScopus138WoS132OpenAlex138İncele - MakaleYalnız künye2012Scopus SJRQ4Virtual or physical: In-service and pre-service teacher's beliefs and preferences on manipulatives
Akkan, Yasar
Although the use of physical manipulatives, which have been emphasized to use in preschool education program and primary and secondary mathematics curriculum, in classroom environments is old, it is very new to use virtual manipulatives in classroom environments. The selection, preparation, and the integration to learning environments of both types of manipulatives are the most basic duties of teachers. However, the experiences, of using the physical and virtual manipulatives in course environments, of teachers and pre-service teachers are influenced by beliefs about the nature, teaching and learning of mathematics. The aim of this study is to determine and compare the beliefs of teachers and pre-service teachers in different branches for the use of virtual and physical manipulatives in mathematics education. For this purpose, 148 teachers, in the provinces of Trabzon, Kars and Gümüşhane, and 228 pre-service teachers, in the Education Faculties of Karadeniz Technical University and Kafkas University, have been applied two types of scales and interviews have been conducted with 40 teachers and pre-service teachers selected from that sample. Frequencies, percentages and arithmetic averages have been used to analyze the data. As a result, the majority of teachers and pre-service teachers have been identified to carry positive beliefs for the use of virtual and physical manipulatives in mathematics education and they have expressed that they desire to use both types of manipulatives more in the future.
AtıfScopus4WoS3İncele - MakaleAçık Erişim2014Scopus SJRQ2The main quality attributes of non-sprayed cherry laurel (Laurocerasus officinalis Roem.) Genotypes
Yildiz, Hilal; Ercisli, Sezai; Narmanlioglu, Haluk Kemal; Guclu, Saban; Akbulut, Mustafa; Turkoglu, Zumrut
Cherry laurel (Laurocerasus officinalis) is naturally growing in black sea region in Turkey and the trees has not been spraying with pesticides. In natural growing conditions, all cherry laurel genotypes particularly fruits are seems resistant against pests. Astringent nature of fruits forms a barrier for pests. A total twelve cherry laurel accessions were harvested at full maturation time from various sites in Of district located in eastern black sea region in Turkey. Fruits were analyzed for their total phenolic (TP), total monomeric anthocyanin (TMA), total carotenoid (TC), Vitamin C and for their antioxidant capacity by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) in fruit flesh extract. Variability among accessions was greatest for total phenol (TP) and total anthocyanins content ranged from 154 to 213 mg GAE per 100 g and 397 to 519 mg per 100 g. The results indicated that cherry laurel fruits are superior and unique in terms of bioactive content in particular compared to bioactive rich fruit species.
AtıfScopus12WoS11OpenAlex15İncele - MakaleYalnız künye2011Scopus SJRQ3Using landsat data to determine land use/land cover changes in gümüşhane, Turkey
Döner, Fatih
Sustainable land use and development require timely, accurate and detailed information of land resources as well as changes in the land resource. 'What is changing in where' question is answered by multiple observations over a period of time. Remote sensing technology provides such a monitoring requirement. The aim of this study was to analyze land use/ land cover (LU/LC) changes between 1975 and 2000 in Gümüs ̧hane, Turkey, using satellite images. Three Landsat images from 1975, 1987 and 2000 were used to determine changes. A post classification technique was used based on a hybrid classification approach (unsupervised and supervised). Images were classified into five LU/LC types; urban, agriculture, forest, pasture and other lands. It is found that significant changes in land cover occurred between the years 1975 and 2000. The results showed an increase in urban, forest and agriculture and a decrease in pasture and other lands between 1975 and 2000. In this period, urban land increased from 1.25 to 3.78% of the total area. While the area of pasture decreased from 26.74 to 23.44% of the total area, the area of forest and agriculture increased from 37.32 to 39.51% and from 8.83 to 13.27%, respectively.
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