Aksaray Üniversitesi Kurumsal Akademik Arşivi
DSpace@Aksaray, Aksaray Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Finite element analyses of a TLA-type synchronus reluctance machine
(Institute of Electrical and Electronics Engineers Inc., 2022) Özdil, Ali; Uzun, Yunus
Generating energy efficient and eco-friendly electrical machines has been recently focused by researchers due to rapid decline in energy sources and increase in greenhouse gas effect. Since Inductance Machines have some drawbacks: low torque capability, low efficiency hence high energy consumption, and high carbon dioxide emission, designing Synchronous Reluctance Machines is crucial to overcome these drawbacks of Inductance Machines. Synchronous Reluctance Machines have attractive features: higher torque capability, enhanced efficiency, reduced greenhouse gas emission, longer lifetime and maintenance period comparing with Inductance Machines. In this study, flux barrier number, shape of flux barriers and rotor position effects on machine's performance is carried out by Finite Element Analyses. The analyses has concluded that the hyperbolic shaped machine with four barriers is the optimum design considering performance parameters and rotor position considerably affects torque, saliency ratio, power factor and efficiency of machines.
The assessment of plasma asprosin levels in acute coronary artery disease and its correlation with HEART score
(National Scientific Medical Center, 2022) Algın, Abdullah; Özdemir, Serdar; Akça, Hatice Şeyma; Hokenek, Nihat Mujdat; Kokulu, Kamil; Erdoğan, Mehmet Özgür; Yumrutaş, Önder
Objective: It was aimed to compare the serum asprosin levels in patients with ischemic heart disease with healthy subjects, and to evaluate the relationship between asprosin levels with HEART score and mortality in the patients with coronary heart disease. Material and methods: This study was designed as a single-center, prospective study. Sixty-two patients who presented with acute chest pain and underwent digital subtraction coronary angiography and 31 healthy subjects were included in the study. Fasting serum asprosin levels were compared between patients and healthy individuals. The HEART score was calculated for each individual, and its relations with asprosin and one-month mortality were evaluated. Results: The minimum age of 93 cases included in the study was 24, the maximum age was 85, and the median age was 64. HEART score was higher in cases who had mortality within one month (p<0.0001). Plasma asprosin values were higher in patients with one-month mortality (p<0.0001) and lower in the control group compared to the study group (p=0.015). There is a statistically significant weak positive correlation between HEART score and asprosin value (p=0.006, r=0.285). Conclusion: Serum asprosin level can be used both diagnostically and as a biochemical marker in the evaluation of mortality and prognosis in patients with ischemic heart disease.
Reasons for high adsorption efficiencies in lead removal from aquatic solution
(MDPI, 2022) Çelebi, Hakan; Bahadır, Tolga; Şimşek, İsmail; Tulun, Şevket
Heavy metals are of great concern worldwide in terms of environmental pollution due to their effects, such as persistence in the environment, bioaccumulation, and toxicity for organisms. These pollutants in a non-biodegradable inorganic form are released into water, soil, and air from different industrial sectors Lead ions are also a toxic heavy metal in terms of human health and this pollutant is permanent in the ecosystem. Among the many treatment methods, adsorption is an inexpensive, eco-friendly, and efficient process for removing Pb ions from water contaminated with lead ions. The most important detail that draws attention both in our research of the literature and in our own studies is that very high removal efficiencies of lead ions can be obtained with many different inorganic and organic adsorbents. Such high removal efficiencies cannot be obtained for other heavy metals and metalloids. Therefore, this study aimed to reveal the difference in the adsorption process of lead. The physicochemical and biological properties of lead ions and the effects of specific properties, such as amphoteric structure, free electron, post-transition metal, and the low melting temperature, were investigated accordingly.
Teacher education in Turkey from past to present
(Springer Nature, 2022) Köklü Yaylacı, Hasret; Özyıldırım Gümüş, Feride
The teacher education policies developed and implemented by a country are of key importance for its education system. Effective education policies, which can be followed over years for social, political, economic, and environmental reasons, may result in sustainable development that benefits current and next generation’s well-being. Therefore, all countries should construct their education policies and philosophies in terms of their needs, cultures, economic conditions, and the requirements of their geographical structure. These needs and requirements may change over time, and accordingly, the adopted education philosophy and teacher education systems can be revised. In order to talk about teacher education in Turkey, first, the history of teacher education, which started with the establishment of the Republic of Turkey in 1923, will be discussed. Subsequently, the curricula used throughout the history of teacher education and the assessment methods adopted within the framework of these curricula will be examined. Then, the preferred teaching and learning approaches that shaped Turkish education curricula will be explained. Lastly, the professional development of teachers and pedagogical innovations and practices that enable effective teaching and engage students’ in learning will be elaborated.
Recent advances in biosensor based phthalate analysis
(Nova Science Publishers, Inc., 2022) Yılmaz, Erkut; Ahbab, Müfide Aydoğan; Aydın, Fatma Gülruy; Türkoğlu, Emir Alper
Phthalates are found in dye solvents, glues, cosmetics, personal care products, detergents and a variety of other products in addition to their use as plasticizers. For this reason, phthalates are called as "the everywhere chemical. " Despite their wide usage, people are becoming more concerned about phthalates with the better understanding of their effects on organisms and the environment. Many regulatory agencies classify phthalates as priority pollutants and restrict or prohibit their use. This situation has increased the importance of monitoring and detection of phthalates in various environmental and biological matrices including drinking and surface water, soil, sediment, indoor and/or outdoor air, food, milk, blood, saliva and urine. Conventional phthalate detection methods are usually laboratory-based and have significant drawbacks such as the requirement for appropriate laboratory settings and skilled workers as well as long test periods, expensive and complex processes. As a result, there is a growing interest on novel analytical techniques for detecting phthalates from a variety of media in a cost-effective, fast, selective and sensitive manner. Biosensor-based methods present alternatives to conventional detection approaches for the determination of phthalate from complicated matrixes. This chapter focuses on the recent approaches for biosensor-based phthalate analysis including biological/biomimetic recognition elements and novel sensor materials such as nanomaterials, metal-organic frameworks and micro or nano electromechanical systems.
