148 research outputs found
1980’lere Nasıl Bakabiliriz? Salt, Çoklukta Tekillik Sergi ve Atölyesi Kapsamında Konuşma
No full text##nofulltext##İnceoğlu, Arda (MEF Author)..
Art Arda Teslimli Satış Sözleşmelerinde Satıcının (borçlu) Temerrüdüne Bağlı Sonuçlar
No full text##nofulltext##Kadir Berk Kapancı (MEF Author)Art arda teslimli satış sözleşmesi, satıcının satış konusu mala ilişkin borcunu birden fazla defada ve birbirini izleyen farklı ifa zamanlarında olmak üzere ayrı ayrı gerçekleşecek teslimatlar dairesinde ifa etmesini öngörür. Bu sözleşme duruma göre dönemli veya sürekli mahiyette olabilir. İlgili sözleşme yapıları dahilinde satıcının bir veya birden fazla teslim borcunda temerrüde düşmesi halinde nasıl bir uygulama yapılacağı aydınlatılmalıdır. Duruma göre farklı olasılıklar söz konusu olabilecektir, her bir somut durum ayrı ayrı ele alınmalıdır. İşbu çalışma, farklı yapılarda ortaya çıkabilecek art arda satış sözleşmelerinde satıcının temerrüdüne bağlı sonuçları ayrıntılarıyla ele almayı hedeflemektedir
Experimental and theoretical investigation of the effect of the second metal ion in ONNO type hetero-nuclear Schiff base complexes
No full textThe mononuclear Schiff base complex, {N,N'-bis(salicylidene)-1,3-propanediaminato Ni(II)} (NiL), and the hetero-dinuclear complex, {bis(N,N'-dimethylformamide)[μ-N,N'-bis(salicylidene)-1,3-propanediaminato] Ni(II)} dichloro zinc (NiLZnCl2) which was obtained by the addition of Zinc atom to the structure of the former were synthesized. Elemental analysis, FTIR, 1HNMR, TGA studies were conducted to determine the chemical structures of synthesized compounds. The molecular structure of NiLZnCl2 was revealed by means of X-Ray diffraction. Cyclic voltametry was employed to determine the electrochemical properties of the compounds whereas UV-VIS spectrophotometry was used to investigate the absorption behaviour. The experimental findings were then linked up with the theoretical computations and interpreted accordingly. In this fashion, molecular orbital computations were conducted for the computed, optimized structure of NiL and the X-Ray structure of NiLZnCl2. The different characteristics in the results of cyclic voltametry and UV-Vıs absorption studies were explained by analyzing the findings of the theoretical computations.Mononükleer Schiff bazı kompleksi, {N,N'-bis(salisiliden)-1,3-propandiaminato Ni(II)} (NiL) ve bu kompleksin yapısına çinko atomunun dahil edilmesiyle elde edilen hetero-dinükleer kompleks, {bis(N,N'-dimetilformamit)[μ-N,N'-bis(salisiliden)-1,3-propandiaminato] Ni(II)} dikloroçinko (NiLZnCl2) hazırlandı. Sentezlenen bileşiklerin kimyasal yapılarının belirlenmesi için element analizi, FTIR, 1HNMR, TGA çalışmaları yapıldı, NiLZnCl2 kompleksinin X-ışınları saçılımı ile moleküler yapısı belirlendi. . Bileşiklerin döngüsel voltametri ile elektrokimyasal, ultraviyole görünür bölge spektrofotometri ile de absorpsiyon özellikleri tespit edildi. Daha sonra deneysel olarak elde edilen bulgular teorik hesaplamalar ile ilişkilendirilerek yorumlandı. Bu amaçla NiL kompleksinin teorik olarak hesaplanmış optimize yapısı ve NiLZnCl2 kompleksinin X-ışınları ile belirlenmiş yapısı üzerinden moleküler orbital hesaplamaları yapıldı. Döngüsel voltametri ve UV-VIS spektroskopi çalışmasından elde edilen sonuçlarda çinko atomunun yapıya eklenmesiyle ortaya çıkan, elektronik yapı ve kimyasal özelliklerdeki farklılıklar teorik hesaplamaların sonuçları analiz edilerek yorumlandı. Teorik çalışmada elektron yoğunluk fonksiyonel teori'nin 6.31G baz kümesi kullanıldı
Energetic materials: new N,N,N-pyrazolyl pyridine Ag complexes - synthesis, theoretical and experimental investigation of thermal decomposition properties
No full textBis-2,6(pirazol-1-il)piridin (pp) ve Bis-2,6(3,5-dimetilpirazol-1il)piridin (dmpp) ligandları ve NO3-, ClO3-, ClO4- oksitleyici anyonları ile 6 adet Ag(I) kompleksi sentezlenmiştir. Komplekslerin formülleri [Ag(pp)(NO3)] (I), [Ag(dmpp)(NO3)] (II), [Ag(pp)ClO3)] (III), [Ag(dmpp)(ClO3)] (IV), [Ag(pp)(ClO4)] (V), [Ag(dmpp)(ClO4)] (VI) şeklindedir. Sentezlenen malzemeler infrared spektroskopi ve element analizi yöntemleri ile karakterize edilmiştir. Analize uygun tek kristal formunda elde edilen I, IV ve VI numaralı komplekslerin yapıları, X-ışını difraksiyon yöntemleri ile aydınlatılmıştır. Tüm komplekslerin ısıl bozunma tepkimeleri termogravimetri/diferansiyel termal analiz (TG/DTA) yöntemleri ile analiz edilmiş; parçalanmanın, ekzotermik, patlama benzeri tepkimeler ile gerçekleştiği tespit edilmiştir. Isıl bozunma sıcaklığının, reaksiyon ısısının ve kütle kaybının kompleks yapısındaki anyonun oksijen sayısına paralel olarak artış gösterdiği gözlenmiştir. Bileşiklerin HOMO ve LUMO enerji seviyeleri ve teorik oluşum entalpileri yoğunluk fonksiyonel teori (DFT) kullanılarak hesaplanmıştır. Bozunma tepkimelerinin ısıları diferansiyel taramalı kalorimetri (DSC) ile belirlenmiştir. Teorik oluşum entalpisi ve deneysel olarak belirlenen ısıl bozunma tepkimesinin entalpisi Hess yasası uyarınca bir arada yorumlanarak bozunma ürünleri tahmin edilmiştir. Termo-kinetik analiz için uygun olduğu gözlenen I, II ve VI numaralı komplekslerin termogravimetri eğrileri Coats-Redfern, Flynn-Ozawa-Wall ve Kissinger-Akahira-Sunose yöntemleri kullanılarak analiz edilmiş, kinetik ve termodinamik değişkenler hesaplanmıştır. II numaralı kompleksin iki basamaklı bir tepkime ile, diğer komplekslerin tek basamaklı, çok hızlı tepkimelerle parçalandığı belirlenmiştir.6 energetic Ag(I) complexes- [Ag(pp)(NO3)] (I), [Ag(dmpp)(NO3)] (II), [Ag(pp)ClO3)] (III), [Ag(dmpp)(ClO3)] (IV), [Ag(pp)(ClO4)] (V), [Ag(dmpp)(ClO4)] (VI) - were synthesized from the ligands, Bis-2,6(Pyrazol-1-yl)Pyridine (pp), Bis-2,6(3,5-dimethylpyrazol-1-yl)Pyridine (dmpp) and oxidizing anions, NO3-, ClO3-, ClO4-.. The compounds were characterized by IR spectroscopy and elemental analysis. The molecular structure of the complexes numbered I, IV and VI which have been obtained as suitable single crytals were revealed by X-Ray diffraction methods. The thermal decomposition reactions of each complex were analyzed by using thermogravimetry/differential thermal analysis (TG/DTA). It was seen that they were exothermic explosion-like decompositions. It was noted that the decomposition temperature, enthalpy of reaction and mass loss increased with higher number of oxygen atoms of the oxidizing anion within the complex structure. The theoretical formation enthalpy as well as the HOMO and LUMO energies were calculated by using density functional theory (DFT). The heat of decomposition reactions were measured by using differential scanning calorimetry (DSC). The data were interpreted together and according to Hess' law to estimate decomposition products. The thermogravimetry curves of complexes numbered I, II and VI were found suitable for thermo-kinetic analysis and were analyzed with methods Coats-Redfern, Flynn-Ozawa-Wall and Kissinger-Akahira-Sunose to obtain related kinetic and thermodynamic parameters. It was revealed that the complex II decomposed in a 2 step reaction whereas the others decomposed in rapid, single step reactions
Mediative Performance of Creative Precariat in the Age of Digitalization
No full textIn this thesis, I define the artists who perform physical performances as the artist precariat. Starting from the concept of precariat, I am researching how the life of the precariat artist was affected socially and economically in the transition from physical performance to meditated performance in the age of digitalization. Since this research coincided with the COVID-19 pandemic, I will have better analyzed the companies that were positively and negatively affected by the lockdown and the dimension of precariousness experienced by the artists. In this thesis, the formation of mediatized performance (distributing the video and audio recordings of the produced performance to different media channels) will be explained, to understand what the concept of contemplation is, and to understand the possible losses in art when contemplation becomes cool (artificial) in physical stage art. In addition, I expressed what the concept of precariat means in different studies and why I need to use this concept in this study. Data obtained by semi-structured interviews, which were held with stage company owners and physical performance artists (snowball sampling) and participant observation in field, were analyzed by discourse analysis techniques. Based on the collected data, the relationship between transforming art and artist insecurity will be examined. My analysis is composed of three sections: (1) to examine the measures and difficulties faced by art center owners, audiences, and artists regarding digitalization with the concepts of Baudrillard's “immortality” and Barthes’s “the author is death”. (2) Investigating the social precariousness created by the financial precariousness of flexible working in the arts sector (in the context of age and gender). Examining the concept of “precariat class” used by Guy Standing in his work on precarious working and flexible employment by focusing on the artist group and adding dimension (depth) to the concept in this direction. (3) To explore the adaptation process of precariat art to mediation shifting in the light of Byung-Chul Han’s concept of the “Banopticon” and Durkheim’s study of suicide. As a result of the interviews and fieldwork outputs, the death of art, which was defined metaphorically in the first place, eventually turned into the actual end of the artist. I contend that creative stage artists have difficulties in the transition process because their digital media knowledge and skills are insufficient, rendering them financially and socially precarious. Unemployment and insecurity experienced by the precariat artist in the culture and art sector affect not only the artist himself, but also the family members of the artist, art-loving individuals and the society. For this reason, the artist's insecurity becomes a collective problem rather than an individual one
Production and Enrichment of Erucic Acid Methyl Ester Analytical Standards from Natural Oils for Food Control Analysis
No full textFoods high in erucic acid (EA), a fatty acid considered a natural toxin, can pose various health risks. Studies have reported that people exposed to high levels of EA are more likely to experience cardiovascular disease, are susceptible to myocardial adiposity, and have increased rates of diabetes. Therefore, in 2019, the European Commission (EC) declared that the maximum EA content in vegetable oils should be no more than 2%. These regulations require EA analysis in import and export food samples. A methyl ester of EA (EAME) standard is required to analyze EA content. In many countries, this analytical standard is not available and is being imported. This study endeavored to economically produce the EAME standard, which is in high demand due to mandated analysis, using natural oils. Initially, the fatty acid amounts in the food samples were analyzed by the gas chromatography–mass spectrometry/flame ionization detection (GC-MS/FID) method. The analyses revealed that mustard seed oil had the lowest EA content, while yellow mustard seed oil had the maximum EA content. The esterification was conducted on the samples containing both high and low EA, resulting in an efficiency of approximately 80%. The crystallization process was subsequently repeated to increase the EA quantity until the highest EAME content was obtained. By this process, 14 different concentrations of EAME ranging from 2.33 to 55.66% were produced. These results demonstrate the first successful production of EAME standards from natural oils that can be used in validation and internal quality control studies for food control analysis. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024
Streamflow Forecasting Using Different Neural Network Models with Satellite Data for a Snow Dominated Region in Turkey
No full textAbstractData driven models such as Artificial Neural Networks (ANNs) became a very popular tool in hydrology for a long time, especially in rainfall–runoff modelling. However, it does not have common usage in mountainous catchments, where snowmelt plays an important role, due to lack of continuous snow observations. In order to improve the accuracy of snowmelt modeling, recently available satellite snow products are considered as an alternative input to these models. In this study, two different ANN models are employed and compared with each other using novel MODIS satellite snow covered area products as an alternative input into climatic data based models. Firstly, flows are modelled with Multi-Layer Perceptron (MLP) network using gradient-based Levenberg–Marquardt algorithm. Secondly, Radial Basis Function (RBF) network is developed. Both models are performed to estimate the daily flows of Karasu River in the Upper Euphrates Basin, Turkey using 2002 – 2011 data. The main difference between the RBF network and MLP network is in the nature of the nonlinearities associated with hidden nodes. The nonlinearity in MLP is implemented by a fixed function such as a sigmoid. On the other hand, the RBF method bases its nonlinearities on the training set data. In the study the determination of model architectures, optimization algorithms and methods to avoid overfitting are elaborately investigated
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