Search

Bu çalışmada, moleküler yapısı tek bir kristalX-ışınım yöntemi ile belirlenen [Ni(2-Benzimidazol-il-üre)2(etanol)2][NO3]2bileşiğinin teorik hesaplamaları yapılmıştır. Teorik hesaplamalarda elde edilenoptimize geometri, dipol moment gibi birçok özellik deneysel değerlere oldukçayakın sonuçlar göstermiştir. Bunların dışında bileşiğin gaz fazında sınırorbitalleri, hesaplanan sınır orbitallerin enerjilerinden elektronik yapıtanımlayıcıları, moleküler elektrostatik potansiyel haritası, doğrusal olmayanoptik özellikleri hesaplanmış ve yorumlanmıştır. Çalışmanın birçok organometal kompleksinmoleküler özelliğine ışık tutacağı düşünülmektedir. Yoğunluk FonksiyonelTeorisi (YFT), Gaussian 09W programı kullanılarak hesaplama yöntemi olarakseçilmiştir ve kompleks için B3LYP/LANL2DZseviyesinde optimize edilmiş gaz faz kuantum mekaniksel verileri eldeedilmiştir., Thetheoretical calculations of the [Ni(2-Benzimidazoly-urea)2(ethanol)2][NO3]2 compound, whose molecular structure was determinedwith a single crystal X-ray diffraction method, was conducted. Many propertiessuch as optimized geometry and dipole moment obtained in theoreticalcalculations showed very approximate to experimental values. Apart from these,the frontier orbitals of the compound in the gas phase, the electronicstructure parameters from the energies of the calculated frontier orbitals,molecular electrostatic potential map, non-linear optical properties were calculatedand interpreted. It is thought that the study will shed light on the molecularproperty of many organometal complexes. The Density Functional Theory (DFT) wasselected as a computational method using the Gaussian 09W program, and theoptimized gase phase quantum mechanical data for the complex was obtained inthe B3LYP/LANL2DZ level with genkeyword.

Kimya öğretmen adaylarının hibritleşme konusunda bilgilerinin incelenmesinin amaçlandığı bu çalışmada, nitel araştırma yöntemlerinden biri olan betimsel tarama modeli kullanılmıştır. Çalışma 2017-2018 eğitim-öğretim yılı bahar döneminde Uludağ Üniversitesi Eğitim Fakültesinde formasyon alan değişik Üniversitelerin Fen Fakültesi Kimya bölümlerinden mezun toplam 36 kimya öğretmen adayı ile gerçekleştirilmiştir. Veriler, araştırmacı tarafından geliştirilmiş beş adet açık uçlu sorunun yer aldığı yarı yapılandırılmış görüşme formu ile toplanmış ve betimsel analiz ile değerlendirilmiştir. Araştırmadan elde edilen bulgulara göre öğretmen adaylarının büyük bölümünün, atomik orbitallerden çıkarak hibrit orbital oluşumunu açıklamada sorun yaşadıkları ve günlük hayatta bildikleri maddelerin hibrit orbital türünü belirlemede yetersiz oldukları saptanmıştır. Bu nedenle öğretmenler tarafından hem ortaokul hem de lise seviyesinde, öğretim teknik ve materyallerinden yararlanılarak en ayrıntılı şekilde açıkça anlatılmasının önemli olduğu sonucuna varılmıştır. In this study at which examining the field knowledge on hybridization of chemistry teacher candidates was examined, one of the qualitative research methods, descriptive scanning method, was used. The study was carried out with a total of 36 chemistry teacher candidates who graduated from the faculty of chemistry of different universities who were taking formation classes at the Faculty of Education of Uludağ University in the spring semester of 2017-2018 academic year. The data were collected by semi-structured interview form with five open-ended questions developed on the researcher's side and evaluated by descriptive analysis. According to the findings obtained from the research, it was determined that most of the prospective teachers had problems in explaining the hybrid orbit formation emerging from atomic orbitals and that the materials they know in everyday life were inadequate in determining the hybrid orbital pattern. For this reason, it has been concluded that it is important for the teachers to explain to high school and secondary school level students in the most detailed way by using the teaching techniques and materials.

Although Trabzon persimmon (Diospyros kaki L.) is a beneficial fruit for both human health and industrial use, it is generally used seasonally, and inadequate attention has been given to its off-season use. This study was designed to determine the best drying method for optimizing the quality of dried Trabzon persimmon (Diospyros kaki 'Fuyu'). Samples treated with sodium metabisulfite prior to drying and dried at 65 °C had the highest L* value (P < 0.05). Rehydration value and ascorbic acid content of samples dried at 50 °C were the highest. Nevertheless, these samples had lower total phenolic content than samples dried at 65 °C and 90 °C. Samples treated with sodium metabisulfite before drying had the highest appearance score; however, these samples were the least liked and had the lowest flavor score. Control samples were the most popular samples in terms of flavor (P < 0.05). During storage, control group samples had the highest increase in total mesophilic aerobic bacteria, while samples treated with sodium metabisulfite prior to drying had the lowest increase in total mesophilic aerobic bacteria, owing largely to the antimicrobial effect of sodium metabisulfite. Although sodium metabisulfite treatment gave the best physical, chemical, and microbiological results, these dried persimmons were given the lowest sensory scores.