107 results
Search Results
Now showing 1 - 10 of 107
Research Project Synthesis and Applications of New Conjugated Polymeric Materials Based on CarboraneCombination of conjugated polymers and carborane units under the same roof was taken place recently, for the first time in 2003. In very few number of studies in the literature, it was reported that carborane units gave thermal, mechanical, optical and electrochemical stability to the condujugated polymers. In this study, in order to overcome the problems faced by the industrial field of conjugated polymers (insolubility, thermal, mechanical, optical and electrochemical instability, etc.) the inorganic and organic units will be melted in the same pot for producing new carborane based polymeric materials. In the first two years of the project, initially carborane based electron donor-acceptor-donor (D-A-D) type new inorganic-organic hybrid monomers will be designed and synthesized and then soluble conjugated polymers (low band gap, reversible electronic and optical properties, n- and/or p-type doping behavior, fast switching of various redox states and different colors and environmetally and thermally stable novel florescent conjugated polymers) will be tried to obtain by use of electrochemical and chemical methods. While alkyl substituted 3,4-propylenedioxythiophene and carbazole units will be used as D unit, carborane units will be used as A unit. Tetrabutylammonium salts (perchlorate, tetrafluoroborate and hexafluorophosphate) as the supporting electrolyte and acetonitrile, dichloromethane and/or propylene carbonate will be used as the solvent in the electrochemical polymerization. For the chemical polymerization, Stille Coupling, anhydrous FeCl3 and / or CuI oxidant and/or Yamamoto type Ni (0) dehalogenation polymerization techniques will be used. After the investigation of the electrochemical, optical and thermal properties of the obtained polymeric materials, studies for the industrial and technological applications (electrochromic devices and light emitting diodes (LEDs)) will be done at Atılım University and METU by experienced teams in the last two years of the project. When the materials designed in the project are moved successfully to the industrial fields such as electrochromic devices and LED applications, it will be brought to a solution to an industrial problem by using carborane chemicals. As a result, it will be the primary purpose and goal of our project to overcome the problem faced by industrial areas (electrochromic devices and LEDs) with the products based on special carboranes, which can be synthesized in our country.Research Project Lineer Olmayan Üçlü Schrödinger Denklemi İçin Yapı Koruyan Sayısal YöntemlerA nonlinear implicit energy-conserving scheme and a linearly implicit mass-conserving scheme are constructed for the numerical solution of a three-coupled nonlinear Schrödinger equation. Both methods are second order. The numerical experiments verify the theoretical results that while the nonlinear implicit scheme preserves the energy, the linearly implicit method preserves the mass of the system. In addition, the schemes are quite accurate in the preservation of the other conserved quantities of the system. Elastic collision, creation of new vector soliton, and fusion of soliton are observed in the solitary wave evolution. The numerical methods are proven to be highly efficient and stable in the simulation of the periodic and solitary waves of the equation in long terms. Dispersive analysis of the equation and the numerical methoda is investigated.Research Project : Synthesis Of Electroactive Chemiluminescent Compounds And Polymers For Blood Detection İn Forensic/adli-tıpta Kan Teşhisi için Elektroaktif Kemilüminesans Bileşiklerin ve Polimerlerin SenteziProject Summary Combination of pyridazine based and chemiluminescent units with electroactive compounds and conjugated polymers have been taken place recently. These compounds and conjugated polymers have been reported to be used instead of luminol in order to detect blood traces in forensic science. These studies resulted in the birth of a new series of compounds so-called “luminol-type compounds”. In this study, a new series of chemiluminescent and conjugated trimeric compounds bearing pyridazine ring (Scheme 1) and their polymers will be synthesized and characterized structurally. Then, their chemiluminescent properties and forensic applications (blood detection) will be scrutinized. Scheme 1. Chemical structure of the compounds bearing redox active terminals and chemiluminescent pyridazine units In order to achieve this aim, phthalic anhydride will be utilized to synthesize the target molecules in three steps. This will be advantageous when compared the synthesis of some luminol derivatives which require multiple steps. After the completion of the structural characterization of the compounds, the chemiluminescent reactions of the compounds in basic medium will be tested firstly in the presence of only hydrogen peroxide and then together with various metal cations as catalyst by using a photomultiplier tube. If iron ion is found to exhibit a catalytic role in the chemiluminescent process, the application of blood trace detection in forensic will be studied. First of all, hemin as a hemoglobin analogue will be used to get a standard curve and then the blood samples will be studied. Obtained data will be compared with luminol and its derivatives and also the effect of the substituents (electron donating units: furan, thiophene and selenophene) of the compounds on the chemiluminescent process will be investigated. Next step will be the electrochemical polymerization of the compounds. The structural analyses of the polymers will be studied by using voltammetric and spectroscopic methods (cyclic voltammetry, NMR, FTIR, UV-vis, SEM, GPC, etc.). Chemiluminescent properties and forensic applications of their polymers will also be studied. Furthermore, since the polymers can be obtained as films via electrochemical polymerization, the electrochemiluminescent properties of these polymers will also be investigated. In addition to the polymers’ structural characterization, their electrochemical and optical properties will be studied to search for their possible opto-electronic applications. When the project has reached to its aims, a new series of the chemiluminescent compounds will be synthesized after only a few steps by starting with a cheap compound called phthalic anhydride. Unfortunately, the interest of the present luminol type compounds in the literature is limited since they are synthesized in multiple steps. A new series of the compounds will be obtained for the family of luminol type compounds when the syntheses of the compounds are realized. Due to the systematic synthesis of the compounds (Group 6A: O (furan), S (thiophene), Se (selenophene) atoms used for the same template compound), the effect of the electron donating units will be investigated on the chemiluminescent property. In conclusion, new compounds that are alternative to the luminol used in forensic application will be brought into the literature.Research Project Türkiye\\'nin Sağlık Politikasının Avrupalılaşması ve Yerel Aktörlerin Rolü(2015) Yılmaz, Gözde; Özdemir, Burcu; Yılmaz, Tolga-Research Project Lisans Dersleri için Zaman Serisi ile Açılacak Şube Sayısı ve Kontenjanlarını Tahmin Eden Yapay Zekâ Sisteminin GeliştirilmesiThis project aims to address the problems experienced in traditional methods used in determining course quotas and number of sections in universities. This project, carried out with the support of Atılım University Undergraduate Research Projects, aims to optimize this process by using machine learning models. In the project, XGBoost and LightGBM were examined and their ability to make high-accurate predictions was tested.Research Project Sıfıraltı Sıcaklık Muhafaza Koşullarının Su Verilmiş 2024 Alüminyum Alaşımının Yaşlanma Davranışına ve Şekillendirilebilirliğine Etkisinin AraştırılmasıThe effect of storage conditions on the ageable 2024 Aluminum alloy, which was stored at different subzero temperatures (-12°C, -15°C, -18°C) after quenching, on the aging behavior and mechanical properties of the alloy at room temperature was investigated by performing hardness, tensile and formability tests. It was observed that the samples stored at -18°C hardened at a slower rate at room temperature compared to the samples stored at -15°C and -12°C. Using the data obtained, linear (Linear) and non-linear (Qudratic and Cubic) models were developed to predict the mechanical properties (hardness, yield and tensile strength) of the 2024 Aluminum alloy, depending on the subzero temperature storage conditions and the time spent at room temperature. It was concluded that the performance of Quadratic models obtained from the results of hardness tests was high, and Linear models could be used for future prediction. The results of the tensile tests showed that the Quadratic models have high performance and usability for future prediction. Finally, the relationship between yield strength and hardness values was examined. A 100% positive relationship was determined between hardness and yield strength values.Research Project Promoting Stakeholder Adherence To Mediterranean Diet On Campus Through Menu İnterventions And Social Marketing Strategies / Menü Müdahaleleri ve Sosyal Pazarlama Stratejileri ile Kampüste Paydaşların Akdeniz Diyetine Uyumunu GeliştirmekFood service comprises the production of meals consumed outside the home, including consumers from all age groups and in different sectors. This service sector has evolved through the years, providing an increasing number of meals, which have been drifting away from the Mediterranean Food Pattern. Food service is an important setting for public health interventions, educating consumers and modulating behaviours through the meals provided. Prior research on eating habits has mainly focused on a single stakeholder - typically consumers - and on a narrow set of outcome variables. Although these studies provide important clues about the determinants of adherence to food offer, research has yet to address this issue using an integrative approach of multiple stakeholders (e.g., the consumers, food providers, decisors) across a set of different variables. Also, intervention initiatives, usually act only on the environment without strategies that efficiently engage all the stakeholders involved. Social Marketing is one of the strategies, empirically verified, designed to promote change behavior, which contributions to health and well being of citizens are positively recognized by many. Establishing and managing long-term partnerships that include different groups of stakeholders - consumers, government, retailers and other players - are key elements in the application of mid and upstream social marketing to complex issues. This project, developed in Portugal, Turkey, and Croatia, aims to identify the compliance of food service menus with the Mediterranean Diet in public high education institutes canteens, pinpointing opportunities to intervene, namely: 1) promoting changes in the food offer addressing proximity to the Mediterranean Food Pattern, creating, and offering plant-based meals, with seasonable and local food products and 2) developing tailored social marketing strategies to engaging stakeholders to encourage healthier and sustainable food habits. It gathers a team comprised of nutrition experts on public health and food service, food technologists, gastronomy experts, psychologists, and marketers, with a vast experience and professional skills. To achieve the objectives researches will: 1) develop and index to evaluate compliance of menus with the Mediterranean Diet; 2) based on personal interviews, define priority stakeholders and define methodology for engagement; 3) evaluate perceptions, barriers and facilitators through self-administered surveys and in-depth interviews; 4) develop of a 1-month meal plan framework; 5) develop tools concerning the concept premises to empower the catering employees and consumers to understand the proposed menu methodology; 6) develop a new food concept/product “student bag” (meal on the go) and test it for industry scale up; 7) use previous diagnose to develop social/emotional marketing strategies directed to stakeholders and consumers to achieve food behaviour change and 8) measure the impacts of the implemented strategies through a feasibility test. The project's main ambition is to change the food service paradigm, by creating and implementing a new healthy and sustainable food service concept that truly complies with the Mediterranean diet, as well as solutions that comply with consumers new needs, and also developing and implementing strategies that engage all the stakeholders with this concept. We expect to create the reference in terms of food offer that will be demanded by consumers of the next generations and the standpoint to inspire the other food service sectors/ settings achieving an effective and sustainable food offer change and positively influence food service consumers’ food pattern towards Mediterranean recommendations, while addressing the Sustainable Development Goals (3 - good health and 12 - responsible consumption and production; 17 - partnerships for the goals).Research Project Türkiye'deki Akarsu Köprüleri İçin Güvenlik-değerlendirme Yöntemi ve Oyulma Riski Analizi; Kastamonu Pilot Uygulaması(2017) Akay, Hüseyin; Yanmaz, Ali Melih; Koçyiğit, Önder; Şeker, Nurettin; Yılmaz, Meriç; Koçyiğit, Müsteyde BadunaTürkiye?de meydana gelen akarsu köprülerinin yıkılma veya ağır hasar görme olayları incelendiğinde, bu olayların genellikle taşkınlar sırasında veya hemen sonrasında yaşandığı görülmektedir. Köprülerin çoğunun ise ayaklarındaki aşırı oyulma, ayaklar arasındaki açıklığın akımla taşınan katı malzemenin birikmesiyle daralarak köprü membaında ve açıklığında su seviyesinin artması, hidrolik sıçrama meydana gelmesi gibi hidrolik etkenler nedeniyle zarar gördüğü tespit edilmiştir. Ülkemizde köprü tasarım aşamasında yapısal projelendirme kriterlerine azami dikkat gösterilmekte ancak hidrolik etkenler yeterince dikkate alınmamaktadır. Köprü trafiğe açıldıktan sonra ise zaruri durumlar haricinde herhangi bir gözlem, ölçüm, güvenlik-değerlendirme veya oyulma ölçümü, tahkiki veya bakım/onarım yapılamamaktadır. Dolayısıyla doğal veya insan kaynaklı nedenlerle akarsu taban seviyesi değişimleri, oyulma veya birikme olayları ve bunların yarattığı hidrolik etkenler ile köprü üzerindeki etkileri bilinememektedir. Çalışma kapsamında pilot bölge olarak Kastamonu bölgesi seçilmiştir. KGM?de 15. Bölge olarak bilinen bölgede özellikle hidrolik nedenlerin etkili olduğu ve oyulmanın gözlemlendiği farklı akarsular üzerinde bulunan 5 adet köprü (Bartın I, Bartın III, Filyos V, Çatalzeytin, Gökçebey (Tefen)) seçilmiştir. Projede hidrolojik, hidrolik ve köprü oyulma risk değerlendirme çalışmaları ile arazi çalışmaları gerçekleştirilmiştir. Hidrolojik çalışma kapsamında havzaya ait sayısal haritalarla birlikte meteorolojik ve akım gözlem verileri yardımıyla HEC-HMS yazılımı kullanılarak havzanın hidrolojik değerlendirilmesi yapılmış ve havzanın taşkın potansiyelinin belirlenmesi için morfometrik parametreler seçilerek hesaplanmıştır. Hidrolik çalışma kapsamında bir boyutlu HEC-RAS modeli yardımıyla akarsu yatağından farklı yinelemeli taşkın debileri geçmesi durumunda köprü açıklığı tipi, ayak sayısı, ayak şekli ve boyutları kullanılarak akarsu boyunca taban ve su yüzü profilleri belirlenmiştir. Köprülerde yıllık oyulma riskinin belirlendiği HYRISK yazılımı kullanarak ise oyulma risk analizi yapılmıştır. Saha çalışmalarında köprülerde gözlemsel muayene yapılmış, akarsu tabanı ve farklı köprü noktalarında ölçümler yapılarak akarsu taban değişimleri ile ayaklarda oyulma olup olmadığı incelenmiştir. Yapılan çalışmalar sonucunda akarsu köprüleri için kapsamlı bir envanter ve güvenlik-değerlendirme algoritması geliştirilmiştir. Ayrıca algoritmanın KGM tarafından uygulanabilmesi için mevcut olanaklar göz önüne alınarak bir sistem önerilmiştir.Research Project Design, Synthesis and Technological Applications of New Inorganic-Organic Hybrid Polymeric MaterialsIn this study, a new carborane based electron donor-acceptor-donor type electroactive monomer (1) was synthesized successfully. Monomer 1 has an irreversible oxidation peak at 0.90 V (vs Ag/AgCl) and by the help of repeting cyclic voltammetry between -0.90 V and 1.00 V it was polymerized via electrochemical method. Electrochemical polymerization was performed in 0.1 M tetrabutylammonium hexafluorophosphate (TBAH) /acetonitrile and 0.1 M TBAH/DKM. Electrochemical and optical properties of the corresponding polymer (P1) were investigated. The presence of carborane unit in the polymer backbone preserve the polymer against the ambient conditions, high overoxidation potentials;therefore, the polymer become robust and preserve its properties (optical and electronic). For example, after 1000 cycles, P1 has 96% of its electroactivity. P1 having a narrow band gap like 1.64 eV also have different colors at various oxidation states: therefore, it proved that it is a promising material as an electrochromic material: light violet at neutral state and transmissive sky blue at oxidized state. This stuation was supported by the construction of an electrochromic device. Also, by the sake of comparison, the analog of monomer 1, monomer (59) and polymer (P59) were synthesized. As a result, it was proved that 1 and P1 materials are very precious materialsResearch Project Yüksek Saflıkta ve Basınçta Hidrojen Eldesi için Yüksek Sıcaklık Elektrokimyasal Hidrojen Kompresörü Geliştirilmesi(2022) Devrım, Yılser; Colpan, Can Ozgur; Eren, Enis Oğuzhan; Kuzu, Cemil; Bal, İlay Bilge; Bülbül, Eda; Durmuş, Gizem Nur BulanıkSon yıllarda dünyanın giderek artan fosil enerji kaynakları kullanımı çevresel sorunların artmasına neden olmuş ve buna bağlı olarak alternatif enerji kaynakları giderek artan önem kazanmıştır. Günümüzde hem çevresel kaygılar hem de fosil yakıtların yakın gelecekte tükenmesi nedeni ile enerji üretimi, dağıtımı, depolanması ve kullanımında önemli değişiklikler yapılması gerekmektedir. Alternatif enerji kaynakları içinde Hidrojen enerjisi bu değişimler için ideal bir çözüm olma potansiyeline sahiptir. H2?nin sabit güç üretimi, kimya sanayi ve yakıt hücreli araçlarda yaygın olarak kullanımı için verimli bir şekilde saflaştırılması gerekmektedir. Ancak günümüzde H2 üretimi hala büyük ölçüde fosil yakıtlara dayalıdır ve bu nedenle saf olarak üretilememektedir. Bu nedenle, H2?nin büyük ölçekte saflaştırılması zorunludur. Ayrıca en hafif gaz olan H2?nin hacimsel enerji içeriği yüksek basınçlarda sıkıştırılmadığı sürece, rakip yakıtların oldukça altındadır ve bu da sıkıştırmayı kaçınılmaz kılar. Bu nedenle H2 enerjisinin ve kullanımının yaygınlaşması için verimli saflaştırma ve sıkıştırma önem taşımaktadır. H2?nin hem saflaştırılması hem de sıkıştırılmasını sağlayan elektrokimyasal H2 kompresörünün (EKHK) halen endüstriyel ölçekte kullanılan klasik teknolojilere kıyasla sayısız avantajı bulunmaktadır. EKHK sistemleri termodinamik ve operasyonel avantajlarının yanı sıra kullanım kolaylığı da sağlamaktadır. Bu proje kapsamında yüksek safsızlık toleransına sahip yüksek sıcaklık EKHK uygulamaları için polibenzimidazol (PBI) temelli ve MOF katkılı kompozit membranlar geliştirilmiş ve EKHK uygulaması incelenmiştir. Çalışmada ilk olarak yüksek sıcaklık EKHK sistem performansını ve kararlılığını arttırmak için yüksek sıcaklıklara dayanıklı ve yüksek performanslı kompozit membranlar geliştirilmiştir. Hazırlanan membranların fizikokimyasal ve elektrokimyasal karakterizasyonu yapılarak, en iyi özelliğe sahip membrana ulaşılmaya çalışılmıştır. Daha sonra yüksek performans için özgün akış kanalları ve tasarıma sistemine sahip 5 hücreli EKHK yığını tasarımı ve üretimi gerçekleştirilmiştir. Projede yüksek sıcaklık EKHK sisteminde farklı oranlarda CO, CO2 ve H2 içeren reformat gaz karışımları ile çalışılmış ve saflaştırma performansı incelenmiştir.
