Sürdürülebilir Kalkınma Amaçları

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• MakaleAçık Erişim2025/r/gumushane/16733
  Mineral chemistry, thermodynamic evolution, and crystallization history of late miocene volcanic rocks around posof (Ardahan, Turkiye)

  Cicerali, Derya; Yücel, Cem; Aydinçakir, Emre; Kaygusuz, Abdullah

  This study aimed to constrain the crystallization and emplacement conditions of magmas that produced the Late Miocene volcanic rocks exposed at the junction of the Erzurum-Kars Plateau and the Eastern Pontides in the Northeastern Anatolia Region through a series of thermobarometric analyses. The volcanic succession unconformably overlies Oligocene mudstone, siltstone, and sandstone alternations, with limestone and cherty limestone at higher levels. Petrographically, they consist offine-to coarse-grained basalt, basaltic andesite, and andesite. Mineral compositions include plagioclase (An(16-77)), clinopyroxene (Wo(39-45)En(43-50)Fs(11-12)), orthopyroxene (Wo(3-4)En(73-82)Fs(14-24)), olivine (Fo(63-86)), hornblende (Mg#=0.62-0.79), and Fe-Ti oxides (Usp(0.05-1.44), Ilm(94.10-95.53)). The groundmass comprises microlites of these minerals and volcanic glass. The dominant textures are microlitic porphyritic, hyalomicrolitic, and microlitic porphyritic, while glomeroporphyritic, intergranular, pilotaxitic, subophitic, flow, and vesicular textures are also observed. Widely present disequilibrium features, such as zoning, sieve, and resorption, are common in plagioclase and clinopyroxene. Thermobarometric calculations indicate crystallization temperatures of 880-1230 degrees C, pressures of 0.73-8.71 kbar, oxygen fugacities between (-10.94) and (-8.92), and water contents of4.60-6.32 wt.%. These results suggest that the volcanic rocks crystallized under volatile-rich, oxidizing conditions across a broad depth range (similar to 2-32 km), at relatively high temperatures.

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• MakaleAçık Erişim2024/r/gumushane/16813
  Geochemical and petrological features of Carboniferous granites from the Güneydere (Bayburt) area

  Gücer, Mehmet Ali; Delimehmet, Zeynep; Çimen, Okay

  Middle-Late Carboniferousgranitic rocks are widely observed in larger outcrops in the Eastern Pontide orogenic belt of the Eastern Sakarya Zone. This tectonic belt is an important part of the Anatolian plate in terms of containing igneous rocks with a wide age and composition range. This study presents new petrochemical-petrological data on Carboniferous granites in the G & uuml;neydere and surrounding area of Bayburt (NE Turkey). The granitic rocks, which include an area of approximately 5 km, represent the pre-Jurassic basement in the study area. Besides, they are unconformably overlain by Early- Middle Jurassic volcano-clastics units and Late Jurassic- Early Cretaceous limestones. They mainly consist ofgranite, granite porphyry and aplite, to a lesser extent granodiorite and quartz monzonite. Rocks have high SiO2 contents (60.43-75.51%) and high K calc-alkali to shoshonitic affinities and have been derived from an I-type source. The granitic rocks are metalumine-peralumine in character and are similar to postcollisional volcanic arc granitoids. Whole-rocks major and trace element trends show that plagioclase, hornblende, biotite, apatite, and Fe-Ti oxide mineral fractionations play an important role in the formation of the rocks. It has been revealed that fractional crystallization and assimilation+magma mixing processes play a role in the development of granites. Also, the saturation temperatures calculated from the whole-rock zircon values reflect lower initial magma temperatures. All results obtained indicate that parental magma of studied granitic rocks have evolved from lower/middle crust- derived melts as a result of partial melting and differentiated and emplaced in the continental magma chamber.

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• MakaleAçık Erişim2023/r/gumushane/16554
  Determining the most suitable sectors in terms of the digital supply chain by integrated fuzzy MCDM approach

  Gergin, Ramazan Eyuep

  In this day and age, businesses come up against several challenges due to digital progresses in their supply chain. Digitalization has been expected to play an increasingly important role for both companies and the supply chains of the future. Concordantly, it is important to determine the suitability of the supply chains of the sectors for digitalization in order to cope with the difficulties that the enterprises will face in the future. The main objective of this study is to determine the suitability of the supply chains of the sectors in which medium-sized enterprises operate for digitalization. For this purpose, the criteria which affecting the constitution of the digital supply chain are determined with a comprehensive literature search. Fuzzy Analytical Hierarchy Process (FAHP) is utilized to weighting of the relevant criteria. Sectors which medium-sized enterprises are constitute the alternatives of the study. After the weighting of the criteria, in terms of digital supply chain the suitability of the sectors was evaluated via Fuzzy TOPSIS (FTOPSIS) and Fuzzy VIKOR (FVIKOR). BORDA count technique is utilized to obtain the final decision by integrating the results from these two methods. According to the results of the study, the most important criterion in terms of Global Connectivity digital supply chain was determined as the Manufacturing sector according to FTOPSIS and the Health sector has been determined as the most suitable sector for digitalization according to FVIKOR. As to BORDA Count method, results show that the manufacturing sector is the most suitable sector for digitalization in the general ranking.

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  İncele
• MakaleAçık Erişim2020/r/gumushane/16293
  Effect of filler percentage of recycled asphalt pavement (RAP) materials on CBR performance and cost analysis

  Seferoglu, Aysegul Gunes; Seferoglu, Mehmet Tevfik; Akpinar, Muhammet Vefa; Çelik, Muhammet

  Recycled asphalt pavement (RAP) materials are an alternative to natural aggregate (NA) because they reduce environmental pollution and provide energy and cost savings. In many countries abroad, the usage of RAP materials in road pavement layers are permissible at certain rates. However, the mechanical properties of RAP materials are dependent on; the materials are derived from the in which pavement layer, the service life and construction characteristics of the road it is milled, the properties of the materials used (bitumen and aggregate) in the layer and the characteristics of the milling machine. In this study, two types of RAP materials (RAP(1) and RAP(2)) obtained from the degraded wearing layers of two different roadway using milling machine were mixed with NA in different rates (0%, 15%, 30%, 45%, 60%, 100%). Some of the characteristics of the mixtures were examined with reference to 100% NA mixture values by performing laboratory tests such as bitumen ratio, sieve analysis, modified proctor and California bearing ratio (CBR) on the mixtures obtained. According to the results, maximum rates of RAP(1) and RAP(2) which can be used in plant-mix base type-1 layer as an alternative material to NA is determined according to Turkey Highway Technical Specification. In addition, in the case of using RAP materials, the profit rates of material costs to be reduced by the reduction of the need for NA material are also determined by cost analysis.

  İncele
• Derleme MakaleAçık Erişim2019/r/gumushane/16566
  Literature review on success factors and methods used in warehouse location selection

  Gergin, Ramazan Eyup; Peker, Iskender

  The fact that the production and consumption amounts are different from each other gives a dynamic feature to the concept of storage. In addition, an effective storage activity hinges upon the selection of the right warehouse location that takes into account capital and labor investments; minimizes the transportation cost and time. The aim of this study is to investigate the preliminary researches in the selection of the warehouse location selection and to present information on which success factors and methods are preferred. Within this scope, many academic studies have been examined by filtering various databases. According to the results of the study, the most used methods in warehouse location selection are multi-criteria decision making methods such as AHP, ANP and TOPSIS; and the most commonly used success factor is determined as the cost-based factors.

  İncele
• MakaleYalnız künye2017/r/gumushane/18621
  Manyeto-reolojik malzemelere ferromanyetik toz ilavesinin mekanik özelliklere etkisinin deneysel olarak incelenmesi

  Mazlum, Uğur; Gümrük, Recep

  Ferromanyetik toz partikülleri, manyetik alana duyarlılıklarından dolayı günümüzde pek çok alanda kullanılmaktadır. Bu tozların matris malzemeleri ile birleşimlerinden elde edilen kompozit MRE malzemeler sınıflandırılmaktadır. Bu çalışmada, RTV (room temperature vulcanization) silikon kauçuğuna dört farklı manyetik toz ilave edilmesi ile elde edilen kompozit MRE malzemelerinin bası yüklemesi altındaki mekanik özelliklerinin incelenmesi amaçlanmıştır. Matris malzemesi olarak mühendislik açıdan kullanımı yaygın olan Vario 40 silikon kauçuk malzemesi kullanılmıştır. Kompozit MRE malzemelerde toz oranı hacimce %30 oranında tutulmuştur. Ayrıca, tozların yönlenmesinin etkisini incelemek için, üretim esnasında bazı numunelere dış manyetik alan uygulanmıştır. Bu numuneler anizotropik olarak adlandırılırken diğerleri izotropik numunelere olarak adlandırılmıştır. Sonuçlar göstermiştir ki; anizotrop MRE numuneler izotrop numunelere göre çok daha yüksek gerilme değerlerine sahip olmaktadır ve en büyük gerilme artışı BASF CN tozu ilave edilen anizotrop MRE malzemeler için elde edilmiştir. Ayrıca, numuneler MR etki açısından da değerlendirildi ve izotropik versiyonlarına göre %201 gibi bir artış değeri ile en büyük MR etki SQI tozu içeren anizotrop numunelerde gözlemlendi. Sonuç olarak, gerçekleştirilen çalışma ile MRE malzemelerin mekanik ve MR özellikleri, ilave edilen tozun cinsi ve manyetiklik özelliklerine ciddi bir şekilde bağlı olduğu belirlenmiştir

  İncele
• MakaleAçık Erişim2017/r/gumushane/15864
  Experimental investigation of the effect of ferromagnetic particles addition on mechanical properties of magneto-rheological materials

  Mazlum, Ugur; Gümrük, Recep

  The ferromagnetic particle, are used in many areas due to their magnetic field sensitivity. Composite MRE materials which obtained from the combination of the matrix material with these particles are classified as a kind of smart materials. In this study, it is aimed that the compressive mechanical properties of MRE materials produced by adding four different magnetic particles in RTV (room temperature vulcanizing) silicone elastomer are investigated. As a matrix material Vario 40 silicone rubber were used, which is common in engineering application. The particle rate inside MRE materials was kept at 30% by volume. In addition, to investigate the influence of orientation of particles inside MRE materials, some samples were subjected to external magnetic field during production. These samples are named as anisotropic MRE materials while the others are described as isotropic ones. The tests showed that anisotropic samples have much more strength values according to isotropic samples. Of all, the MRE samples including BASF CN particles reveal the biggest strength values. Also, the samples were evaluated in terms of MR effect and the largest MR effect with an increase value of 201% was found for anisotropic samples including SQ-I particles with regard to the corresponding isotropic one. As a result, this study determined that the mechanical and MR properties of MRE materials seriously depend on ferromagnetic particle kind and its magnetic characteristic.

  İncele
• MakaleYalnız künye2015/r/gumushane/18926
  Çift yanlı doğrusal hareketli sürekli mıknatıslı senkron motorun parametrelerinin belirlenmesi

  Otkun, Özcan; Akpinar, Adem Sefa

  Bu çalışmada, bir Çift Yanlı Doğrusal Hareketli Sürekli Mıknatıslı Senkron Motorun tasarımı yapılarak parametreleri belirlenmiş ve belirlenen parametreler ile test sonuçları karşılaştırılmıştır. İlk olarak motorun tasarım detayları verilmiş ardından motor parametrelerinin elde edilmesinde kullanılan yöntemler aktarılmıştır. Parametrelerin bulunmasında üç farklı yöntem kullanılmıştır. Bu yöntemlerden birincisi klasik yöntem olan deneysel yöntemdir. İkinci olarak hassas bir dijital LCR metreden elde edilen sonuçlardır. Üçüncü olarak ürün kodu LG-SV022İG5A-4 olan motor sürücüsünden elde edilen sonuçlardır. Bu sonuçlarla hazırlanan bilgisayar programı yardımı ile motor test edilmiştir. Test sonuçlarından elde edilen akım, frekans, itme kuvveti ve hız grafikleri verilmiş ve bu sonuçlar değerlendirilmiştir.

  İncele
• MakaleAçık Erişim2015/r/gumushane/15922
  DETERMINATION OF PARAMETERS FOR DOUBLE-SIDE LINEAR PERMANENT MAGNETS SYNCHRONOUS MOTOR

  Otkun, Ozcan; Akpinar, Adem Sefa

  In this study, the test results were compared with the parameters specified and determination of parameters of the design Double-Side Linear Permanent Magnet Synchronous Motor. Firstly given the design details of the motor and then transferred to the methods used to obtain the parameters of the motor. Three different methods were used in finding the parameters. The first of these methods, the classical method, the experimental method. The second is a digital LCR meter sensitive results obtained. The third one the motor drive LG-SV022IG5A-4 results obtained from the product code. With these results, the motor was tested with the help of computer software is prepared. From the results of the test current, frequency, and the results were evaluated given pushing force and speed graphics.

  İncele
• MakaleAçık Erişim2015/r/gumushane/15869
  INVESTIGATION OF MECHANICAL PROPERTIES OF MAGNETO-RHEOLOGICAL ETHYLENE PROPYLENE DIENE MONOMER AND NATURAL RUBBER TYPE SYNTHETIC RUBBERS FOR BOTH ISOTROPIC AND ANISOTROPIC SITUATIONS

  Mazlum, Ugur; Gümrük, Recep

  Magneto-rheological (MR) materials are in a smart material class that has the rheological properties to be quickly and reversibly controlled with the external magnetic field applications. Considering the technological developments the rubber-like smart materials has had a more functional usage area with magneto-rheological effect. This study investigates the axial mechanical properties of magneto-rheological Ethylene Propylene Diene Monomer (EPDM) and Natural Rubber (NR) type synthetic rubbers for isotropic and anisotropic situations. Also, these composite materials were built by means of hot press systems as either isotropic or anisotropic using magnetic field application after addition of ferromagnetic powders. The influence of magnetic field was investigated. In this study, NR rubber was found to be more susceptible in terms of smart material properties unlike EPDM synthetic rubber.

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