Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Uzun, Sevda(67)
- Merdan, Mehmet(59)
- Duran, Celal(49)
- Ozdes, Duygu(46)
- Kaygusuz, Abdullah(45)
- Demir, Selim(37)
- Turan, Ibrahim(37)
- Karsli, Orhan(36)
- Öztürk, Serkan(35)
- Dokuz, Abdurrahman(34)
- Araz, Onur(32)
- Kandemir, Raif(31)
- Kulakaç, Nurşen(29)
- Sipahi, Ferkan(29)
- Arslan, Mehmet(27)
- Baltaci, Cemalettin(27)
- Baltacı, Cemalettin(27)
- Kurt, Kemal(27)
- Topal, Fevzi(27)
- Gücer, Mehmet Ali(25)
- Peker, Iskender(25)
- Aydin, Faruk(24)
- Bayrakdaroglu, Serdar(24)
- Maden, Nafiz(24)
- Ozturk, Samet(24)
- Vural, Alaaddin(24)
- Yolcu, Halil(24)
- Yücel, Cem(24)
- Aliyazicioglu, Yuksel(23)
- Kankal, Murat(23)
- Reis, Hatice Catal(23)
- Ürkek, Bayram(23)
- Günen, Mehmet Akif(22)
- Kurnaz, Muammer(22)
- Topal, Meryem(22)
- Karimullah, Suud Sarim(21)
- Uysal, Ibrahim(21)
- Ashyralyyev, Charyyar(20)
- Aydin, Aydanur(20)
- Bayraktar, Alemdar(20)
Yayınlar
- MakaleYalnız künye2016The Relationship Between Female Labor Force Participation and Labor Productivity: Panel Data Analysis
Koyuncu, Julide Yalcinkaya; Yilmaz, Rasim; Ünver, Mustafa
We examine the relationship between various indicators of female labor force participation and labor productivity. We test the hypothesis that labor productivity boosts as the female employment increases by exploiting a panel data set including the period 1985 to 2010 and 111 countries and using three labor productivity indicators and three female labor force participation indicators. We identified a positive correlation between female labor force participation indicators and labor productivity. This finding is statistically significant and valid for three different productivity indicators and three different female labor force participation indicators. Thus, the results suggest that female labor force participation increases labor productivity, controlling for other factors that may contribute to labor productivity.
AtıfWoS1TR Dizin1
İncele - MakaleYalnız künye2016The Relationship between Taxation and Democracy: Panel Causality Analysis for Developing Countries
Türedi, Salih; Topal, Mehmet Hanefi
This study analysis the relation between democracy and taxation in the context of developing countries. At the end of empirical analysis covering 60 countries by focusing on the period of 2006-2012, findings showing a two-way causality relation between taxation and democracy were reached. Accordingly, an increase in taxation level affects rule of law, organizational right, freedom of expression and belief positively in the countries analyzed. Briefly, it plays a vital role in the development of democracy by making a contribution to the enhancement of civil liberties. On the other hand, improvements in democratic rights and freedoms increase the number of citizens paying their taxes in full and on time, thus increases taxation level, by strengthening the harmony between citizens and state.
AtıfWoS1TR Dizin11İncele - MakaleYalnız künye2016Analysis of Production Potential of Textile Sector and Efficiency of Government Incentives in Turkey
Önder, Kubra; Sahin, Muhammet
Textile sector, as one of the oldest industries of the world, has become a leading sector in economic development of the developing countries both in terms of export, added-value and production process. The sector operating under constantly changing global market conditions is affected by internal and external developments very quickly. In a competitive environment brought about by the global economic life, countries are implementing incentive and subsidy policies which are one of the economic policy instruments. In this context, the objective of this study is to examine the effectiveness of the incentive policies for the textile sector using quarterly data for the period 2001-2015. When empirical evidence obtained through Vector Error Correction Model (VECM) is examined, it is concluded that incentive policies applied for textile industry are consistent with economic expectations.
- MakaleAçık Erişim2016Evaluation of forest management plans in conjunction with the cadastral information: The case of Agva and Beykoz, Istanbul
Cakir, Gunay; Guler, Alptug; Zengin, Hayati; Degermenci, Ahmet Salih
Determination of land ownership and boundaries is one of the most important purposes of the urban and rural land laws. There can be some boundary problems while preparing forestry area of any urban area when there is not consistency between the borders constructed by different state organizations like land cadastre, forest cadastre and forest management and planning teams. This study aims to illustrate these conflicts in forestry applications process of two different areas (Agva and Beykoz) having different characteristics. The study was carried out in Agva and Beykoz districts in the province of Istanbul and focused on the integration in the land and forest cadastral systems. The Beykoz and Agva Forest Planning Units have different characteristics in terms of population (urban and rural) and social impacts. Analyses of the data obtained from the field studies which it was utilized for the investigation of the data obtained from various base maps, were carried out using GIS software. Many inhabitants of the villages in the Agva Planning Unit had migrated from the district. Thus, in accordance with Boundary Law number of 6831 part of 2/B some parcels of villages in Agva were determined to be acting forest and were reassigned as forest land. In Beykoz, however, areas of this nature were few and the destruction of the forests was great. The spatial analysis of the study made it possible to remove discrepancies occurring in the cadastral situation by preparing forest management plans. Consequently, if land cadastre and forest cadastre units carry out work in coordination to determine the cadastral situation, a basis for forest management plans can be established and cadastral problems greatly reduced.
- MakaleYalnız künye2016Scopus SJRQ2Nonlinear Earthquake Performance Evaluation of a Structure Collapsed during the Van, Turkey, Earthquake on October 23, 2011
Çavdar, Ozlem; Bayraktar, Alemdar
The paper investigates the structural performance of a seven-story reinforced concrete (RC) building that collapsed during the Van (Turkey) earthquake on October 23, 2011, using nonlinear static and dynamic methods. The selected RC building has two blocks and was designed according to the Turkish Earthquake Code (TEC) in 1975. The site investigation included sections and steel detailing and soil and concrete properties taken after the earthquake. The pushover and nonlinear time history analyses of the building were completed using the existing plan and test and observation data. It is concluded that the building collapses both analysis types. (C) 2015 American Society of Civil Engineers.
AtıfWoS7OpenAlex8İncele - MakaleAçık Erişim2016Scopus SJRQ2Comparison of flow behavior and physicochemical characteristics of low-cholesterol mayonnaises produced with cholesterol-reduced egg yolk
Yüceer, M.; Ilyasoǧlu, H.; Özçelik, B.
Egg yolk is common functional ingredient in food production, mainly in mayonnaise as an emulsifier. Egg yolk cholesterol was removed using β-cyclodextrine, treated with α-Amylase, and low-cholesterol mayonnaise produced. The flow behavior of cholesterol-reduced mayonnaise was investigated at different cholesterol-reduced egg yolk and xanthan gum content. The aim of this study was to evaluate the effects of different formulations at various percentages of egg yolk (EY; 4 and 6 percent by weight) and xanthan gum (XG; 0.5 and 0.7 percent by weight) on flow behavior and physicochemical properties of reduced-fat and low-cholesterol mayonnaise prepared with cholesterol-reduced liquid egg yolk and to obtain suitable model for mayonnaise formulations. The aim of the study was to develop a reduced-fat and lowcholesterol mayonnaise with properties similar to those of typical mayonnaise in the market. For this purpose, four reduced-fat and low-cholesterol mayonnaise formulations were prepared in the laboratory using cholesterol-reduced EY. They were compared with a commercial mayonnaise from a local market as a control sample. According to results, color parameters and flow behaviors of the samples compared with the control sample indicated that the samples had higher values of lightness and yellowness, and presented lower values of yield stress and flow behavior index and higher values of consistency coefficient with respect to the commercial product, except recipe that included 6% of EY and 0.7% of XG, which exhibited similar values to the typical commercial one in the market. The Herschel Bulkley model was employed in order to evaluate the effect of EY and XG ratios on mayonnaise rheological behavior. In general, the results obtained suggest that the recipe with EY (6 wt%) and XG (0.7 wt%) had better rheological characteristics and physicochemical properties those prepared with various formulations, maintaining the reduced-fat and low-cholesterol mayonnaise prepared with β-cyclodextrine-Treated cholesterol-reduced EY. It can be interpreted that the developed product may have potential use in industrial application.
AtıfScopus17WoS17OpenAlex20
İncele - MakaleYalnız künye2016Scopus SJRQ2Improving Rheological and Baking Properties of Gluten-Free Breads Using Defatted Hazelnut Flour with Various Gums
Tunç, Merve T.; Kahyaoglu, Talip
Defatted hazelnut flour (DHF) in different levels (5%, 10% and 15%) of locust bean, guar and xanthan gum were added in rice-based gluten-free formulations to improve rheological properties of dough and baking properties of bread. The rheological characteristics of dough samples were determined by steady flow curves and dynamic tests. The baking properties of breads were evaluated by specific volume, Textural Profile Analysis (TPA) parameters and color values. The rheological measurements showed that all gluten-free dough had pseudoplastic behavior. Specific volume values of breads ranged from 2.20 to 2.83cm3/g. Gum addition enhanced the specific volume of gluten-free breads. Hardness values of gluten-free breads ranged from 1,069.80 to 3,135.88 g and DHF addition of gluten-free formulations caused significant decrease of the hardness values of breads (p < 0.05). DHF addition in gluten-free formulations made bread crumb darker than bread without DHF and gum. DHF addition also increased a and b values of gluten-free bread's crumb.
AtıfScopus15WoS12OpenAlex17İncele - MakaleYalnız künye2016Scopus SJRQ2Increased expressions of ADAMTS-13 and apoptosis contribute to neuropathology during Toxoplasma gondii encephalitis in mice
Dincel, Gungor Cagdas; Atmaca, Hasan Tarik
Toxoplasma gondii (T. gondii) is a protozoan parasite with the potential of causing severe encephalitis among immunocompromised humans and animals. Our previous study showed that T. gondii induces high nitric oxide (NO) production, high glial activation (GFAP) and neurofilament expressions, leading to severe neurodegeneration in toxoplasma encephalitis (TE) in the central nervous system (CNS). The aim of this experimental study was to investigate ADAMTS-13 expression and apoptosis in CNS and to identify whether they have any correlation with toxoplasmosis neuropathology and neurodegeneration. Mice were infected with ME49 strain T. gondii and the levels of ADAMTS-13, caspase 3, caspase 8, caspase 9, TNFR1 and Bcl-xL expressions were examined in brain tissues by immunohistochemistry, during the development and establishment of chronic infections at 10, 30 and 60days post-infection. Results of the study revealed that the levels of ADAMTS-13 (P < 0.005), caspase 3 (P < 0.05), caspase 8 (P < 0.05), caspase 9 (P < 0.005) and TNFR1 (P < 0.05) expressions in the brain markedly increased while Bcl-xL expression decreased (P < 0.005). The most prominent finding from our study was that 10, 30 and 60days post-infection ADAMTS-13 increased significantly and this may play an important role in the regulation and protection of the blood-brain barrier integrity and CNS microenvironment in TE. These results also suggest that T. gondii-mediated apoptosis might play a pivotal role and a different type of role in the mechanism of neurodegeneration and neuropathology in the process of TE. Furthermore, expression of ADAMTS-13 might give an idea of the progress and is critical for diagnosis of this disease. To the best of the authors' knowledge, this is the first report on ADAMTS-13 expression in the CNS of T. gondii-infected mice.
AtıfScopus31WoS29OpenAlex32
İncele - MakaleYalnız künye2016Scopus SJRQ1Theory of Justice, OCB, and Individualism: Kyrgyz Citizens
Özbek, Mehmet Ferhat; Yoldash, Mohammad Asif; Tang, Thomas Li-Ping
Research suggests that organizational justice (procedural, distributive, and interactional justice) has important impacts on work-related attitudes and behaviors, such as organizational citizenship behavior (OCB). In this article, we explore the extent to which individualism moderates the relationship between organizational justice and OCB (organizational obedience, participation, and loyalty) among citizens in Kyrgyzstan. We make additional contributions to the literature because we know very little about these constructs in this former Soviet Union country, Kyrgyzstan, an under-researched and under-represented region of the world. Results of our data collected from 402 managers and employees in Kyrgyzstan offer the following new discoveries. All three justice constructs are related to OCB. Individualism moderates only the distributive and interactive justice to OCB relationships. We develop an intricate theory with provocative implications: Procedural justice produces obedience. For “individualists,” interactional justice inspires loyalty and, interestingly, distributive justice “can only buy” participation, but “can’t buy” loyalty. Therefore, for individualists, interactional justice outweighs distributive justice for organizational loyalty. Based on Kyrgyz citizens’ justice, OCB, and individualism, our theory reveals novel insights regarding culture, money attitude, and intrinsic motivation and provides critical and practical implications to the field of business ethics.
AtıfScopus37WoS29OpenAlex47İncele - MakaleAçık Erişim2016Scopus SJRQ2Combustion Characteristics of Impregnated and Surface-treated Chestnut (Castanea sativa Mill.) Wood Left Outdoors for One Year
Fidan, Muhammed Said; Yaşar, Şekip Şadiye; Yaşar, Mehmet; Atar, Musa; Alkan, Elif
Treating wood with impregnating materials in order to improve resistance to burning is a commonly employed safety measure. In this study, chestnut (Castanea sativa Mill.) wood samples were impregnated using either Tanalith-E or Wolmanit-CB according to ASTM-D 1413-76 and surface-treated using water-based or synthetic varnish according to ASTM-D 3023. These samples were used to investigate the combustion characteristics of samples left outdoors for one year as detailed in ASTM-E 160-50. The combustion temperatures of the samples left outdoors were similar upon impregnation with either Tanalith-E or Wolmanit-CB. However, the combustion temperature of the samples treated with synthetic varnish was lower than those that were treated with water-based varnish. The time to collapse and the total duration of combustion of the samples left outdoors were shorter for those impregnated with Wolmanit-CB. Weight loss of the samples left outdoors was higher for those that were impregnated with Tanalith-E and treated with water-based varnish. Gas analysis of the samples that were left outdoors indicated that the O2 content of flue gas from samples that were impregnated with Wolmanit-CB and treated with synthetic varnish was high and the CO content of flue gas from the same samples was low.
AtıfScopus5WoS4OpenAlex8İncele - MakaleAçık Erişim2016Scopus SJRQ3Evaluation of the radioprotective effect of Turkish propolis on foreskin fibroblast cells
Yalcin, Can; Aliyazicioglu, Yuksel; Demir, Selim; Turan, Ibrahim; Bahat, Zumrut; Misir, Sema; Deger, Orhan
Aim of Study: Propolis is a resinous bee product, rich of polyphenolic compounds and flavonoids. It is known that in different geographic zones its chemical composition varies due to the different plant sources. Many biological properties including antimicrobial, antioxidative, anti-inflammatory, antitumoral, antigenotoxic, antimutagenic, cytostatic activities have been ascribed to propolis. These biological effects are predominantly attributed to its content of polyphenols. In this study, we aimed to evaluate the radioprotective effect of ethanolic extract of Turkish propolis. (EETP) against γ-ray-induced DNA damage on fibroblast cells using comet assay for the first time. Materials and Methods: Fibroblast cells were pretreated 15 and 30 min with concentrations of 100, 200 and 300 μg/mL EETP then they were exposed to 3 Gy γ-rays. Amifostine (synthetic aminothiol compound) was used as a positive control. Results: The results showed a significant decrease in γ-ray-induced DNA damage on cells treated with EETP and amifostine when compared to only irradiated cells. (P < 001). Conclusion: It was concluded that EETP prevent γ-ray-induced DNA damage in fibroblast cells and might have radioprotective activity.
AtıfScopus20WoS24OpenAlex25İncele - MakaleYalnız künye2016Scopus SJRQ2Simplified Early Stopping Criterion for Belief-Propagation Polar Code Decoders
Simsek, Cemaleddin; Turk, Kadir
As the first theoretically proven capacity-achieving error correction code, polar codes have become a milestone in information theory field, which draw serious attention by its low complexity encoding and decoding structures. For the decoding section, studies are focused on efficient and low complex algorithms based on successive cancellation and belief-propagation (BP) decoders. To reduce computational complexity of BP-based decoders further, early stopping methods that avoid unnecessary iterations can be used. In this letter, we propose a reduced complexity early stopping method for BP-based polar code decoders. The proposed method is based on the hypothesis that observing only a small cluster of information bits polarized to the highest error probabilities is enough to detect successful decoding. Simulation results show that the proposed early stopping criterion significantly reduces the computational complexity of successful decoding detection as well as the total operation numbers of the whole decoding process compared with previous methods in the literature.
AtıfScopus45WoS41OpenAlex47İncele - MakaleYalnız künye2016Scopus SJRQ1Logistics center site selection by ANP/BOCR analysis: A case study of Turkey
Peker, Iskender; Baki, Birdogan; Tanyas, Mehmet; Murat Ar, Ilker
Site selection for logistics centers is one of the most strategic decisions in logistics. This study addresses the problem of logistics center site selection, using Analytic Network Process/Benefits, Opportunities, Costs and Risks, which is a multi-criteria decision making technique. The decision problem is applied to the city of Trabzon, which is an important city of the Eastern Black Sea Region in Turkey. First, the results are evaluated in terms of each sub-network and each group and, next, are consolidated for each alternative. They yield that Alternative A is the most appropriate logistics center location of all in Trabzon. Furthermore, the sensitivity analysis results emphasize that the decision model is robust.
AtıfScopus40WoS34OpenAlex45İncele - MakaleAçık Erişim2016Scopus SJRQ2Kinetic and in silico studies of hydroxy-based inhibitors of carbonic anhydrase isoforms I and II
Ekhteiari Salmas, Ramin; Mestanoglu, Mert; Durdagi, Serdar; Sentürk, Murat; Kaya, A. Afşin; Kaya, Elif Çelenk
A series of hydroxy and phenolic compounds have been assayed for the inhibition of two physiologically relevant carbonic anhydrase (CA, EC 4.2.1.1) isozymes, the cytosolic human isozymes I and II. The investigated molecules showed inhibition constants in the range of 1.07-4003 and 0.09-31.5 μM at the hCA I and hCA II enzymes, respectively. In order to investigate the binding mechanisms of these inhibitors, in silico studies were also applied. Molecular docking scores of the studied compounds are compared using three different scoring algorithms, namely Glide/SP, Glide/XP and Glide/IFD. In addition, different ADME (absorption, distribution, metabolism and excretion) analysis was performed. All the examined compounds were found within the acceptable range of pharmacokinetic profiles.
AtıfScopus10WoS11OpenAlex15İncele - MakaleYalnız künye2016Scopus SJRQ1Subduction-related Late Carboniferous to Early Permian Magmatism in the Eastern Pontides, the Camlik and Casurluk plutons: Insights from geochemistry, whole-rock Sr–Nd and in situ zircon Lu–Hf isotopes, and U–Pb geochronology
Karsli, Orhan; Dokuz, Abdurrahman; Kandemir, Raif
Late Carboniferous to early Permian granitoid rocks represent a volumetrically minor component of the Eastern Pontide lithosphere, but they preserve useful information about the region's tectonomagmatic history. The Casurluk and Camlik plutons primarily consist of gabbro, gabbroic diorite, diorite, monzogabbro, monzodiorite and monzonite, which intrude early to middle Carboniferous granitic basement rocks in the region. In this study, we use in situ zircon U–Pb ages and Lu–Hf isotopic values, whole-rock Sr–Nd isotopic values, and mineral chemistry and geochemistry of these plutons to determine petrogenesis and crustal evolution; we also discuss geodynamic implications. LA–ICP-MS zircon U–Pb dating of magmatic zircons from the rocks suggests that the plutons were emplaced during the late Carboniferous to early Permian (302 Ma). The metaluminous and I-type intrusive rocks belong to the high-K calc-alkaline series. In addition, they are relatively enriched in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs); they are depleted in heavy rare earth elements (HREEs) and high field strength elements (HFSEs), such as Nb and Ti. All of the samples have homogeneous initial ISr values (0.70675 to 0.70792) and low εNd (t) values (− 5.1 to − 3.3). Zircons from the rocks of both plutons have uniform negative to slightly positive εHf (t) values (− 3.5 to 1.4) and old Hf two-stage model ages (1323 to 1548 Ma), implying that they have the same source, as well as suggesting the involvement of old enriched lithospheric mantle materials during their magma genesis. These results, combined with the εHf (t) values and two-stage model ages, demonstrate that the primary magmas were derived from partial melting of old lithospheric mantle material metasomatized by subduction-related fluids. Considering other regional geological data from the Sakarya Zone where these plutons formed, we conclude that late Carboniferous to early Permian magmatism in the area involved the partial melting of a phlogopite- and spinel-bearing lherzolite under an extensional regime in a subduction-related setting. Such an extension event would have caused hot asthenospheric upwelling and was likely triggered by back-arc rifting during subduction of the Paleo-Tethyan oceanic slab. Thus, the magmas are likely subduction-related products, implying that southward subduction of Paleo-Tethys oceanic lithosphere in the region began during the late Carboniferous to early Permian.
AtıfScopus59WoS55OpenAlex65İncele - MakaleAçık Erişim2016Scopus SJRQ2Kinetic characterization of GES-22 β-lactamase harboring the M169L clinical mutation
Saral, Aysegul; Leonard, David A; Duzgun, Azer Ozad; Cicek, Aysegul Copur; June, Cynthia M; Sandalli, Cemal
The class A β-lactamase GES-22 has been identified in Acinetobacter baumannii isolates in Turkey, and subsequently shown to differ from GES-11 by a single substitution (M169L). Because M169 is part of the omega loop, a structure that is known to have major effects on substrate selectivity in class A β-lactamases, we expressed, purified and kinetically characterized this novel variant. Our results show that compared with GES-116×His, GES-226×His displays more efficient hydrolysis of penicillins, and aztreonam, but a loss of efficiency against ceftazidime. In addition, the M169L substitution confers on GES-22 more efficient hydrolysis of the mechanistic inhibitors clavulanic acid and sulbactam. These effects are highly similar to other mutations at the homologous position in other class A β-lactamases, suggesting that this methionine has a key structural role in aligning active site residues and in substrate selectivity across the class.
AtıfScopus5WoS4OpenAlex5İncele - MakaleAçık Erişim2016Scopus SJRQ2Determining the Effect of Seasonal Variation in Spruce (Picea orientalis L.) Wood Treated with Various Impregnations on Combustion Resistance
Yasar, Ş. Şadiye; Fidan, M. Said; Yaşar, Mehmet; Atar, Musa; Alkan, Elif
Prepared test specimens were surface treated and coated with synthetic and water-based outdoor varnishes after being chemically impregnated. The test specimens were left outdoors to determine the effects of impregnation and treatment on the wood during each of the four seasons. Caucasian spruce (Picea orientalis L.) test specimens were prepared and combustion analyses were performed. As a result of the combustion test, weight loss results, as compared with the control, were 89% lower in the spring specimens, 90% lower with impregnation, and 90% lower with the synthetic varnish coating. Furthermore, the O2 amount during combustion was found to be the highest in combustion with a flame source in the winter specimens (21%). The CO2 amount was the highest in combustion without a flame source for full-year specimens (20%). The CO amount was the highest in combustion without a flame source of full-year specimens (31,787 ppm), and the NO amount was the highest during glowing of full-year specimens (55 ppm). Final results showed impregnation with Tanalith-E and water-based varnish coating to be the most effective fire protective treatments.
AtıfScopus5WoS5OpenAlex3İncele - MakaleYalnız künye2016Scopus SJRQ2Influence of CrN Coating on Electrochemical Behavior of Plasma Nitrided Pure Titanium in Bio-simulated Environment
Çelik, Ilhan
Titanium and its alloys are widely used as materials for bio-medical applications, such as implants. However, ions of the alloy can release to the body region and spread into the blood circulation. In this study, plasma nitriding and CrN coating techniques are used in order to overcome the problem of ion release. The objective of this study was to investigate the effects of plasma nitrided pure titanium on the structural properties and corrosion behaviors before and after CrN coating in Ringer's solution at 37 °C. The structural properties were investigated using Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD). A diffusion layer and a compound layer composed of δ-TiN and ε-Ti2N phases were observed on the surface of nitrided pure titanium. Corrosion tests were made for the determination of electrochemical properties with the help of Potentiostat/Galvanostat device. The results show that corrosion behaviors of untreated and treated samples have similar characteristic.
AtıfScopus19WoS15OpenAlex19İncele - MakaleAçık Erişim2016Scopus SJRQ3Investigation of structural and tribological properties of duplex surface treated pure titanium
Çelik, I.; Karakan, M.
Commercial pure titanium (CP-Ti) is used in many engineering fields because of its superior properties such as excellent corrosion resistance, high strength/weight ratio, and biocompatibility. However, it is not available at the desired rate, since the CP-Ti has poor wear resistance. For this reason, many surface treatments have been applied to improve the poor tribological properties of the CP-Ti. In this study, duplex surface treatments, which are the combination of treatments of electroless Ni-B coating and plasma nitriding, were applied on the surfaces of the CP-Ti. Structural properties of the different surfaces of the treated materials were investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Microhardness measurements were made for the determination of mechanical properties and the pin-on-disk wear tests were made to determine the tribological properties. It was observed that poor wear resistance of the CP-Ti was improved with duplex surface treatments. The results showed that surface hardness, friction coefficient, and surface roughness of coated samples were better than of uncoated CP-Ti.
AtıfScopus7WoS5OpenAlex6İncele - MakaleAçık Erişim2016Scopus SJRQ3Determination of stand structure in even-aged oriental beech forests in Turkey; [Determinación de la estructura de rodales de Fagus orientalis coetáneos en Turquía]
Kahriman, Aydın; Altun, Lokman; Güvendi, Engin
This study aimed at developing a stand yield model for even-aged and pure Oriental beech (Fagus orientalis) stands in Sinop Province, located in the north of Turkey. The data used in this study were obtained from 238 sample plots. The sample plots are 24–131 years of stand age range, 19.0–35.9 m of site index range, and 2.2–10.8 of stand density range (relative density index). With the generated equation systems, stand age, site index and density of the three main factors in Oriental beech stands, including the effects of individual, dual and triple factor interactions on the stands were numerically determined. As for even-aged Oriental beech stands, the main stand volume values increase depending on age, site index and density. The number of stems per hectare decreases as the stand grows older, and site index rises; the number, however, increases in parallel with stand density. The current annual volume increment reaches a peak at 30-35 years at all site index groups and density levels, and begins to fall afterwards. Mean annual volume increment peaks up at 65-75 years at all site index classes and density levels, before beginning to decline. The results were in arrangement with the acknowledged growth rules. Stand yield models were assessed as Density-Variable Yield Table used for estimation of the remaining, removal and total stands.
AtıfScopus4WoS3OpenAlex1İncele