Oğuz Akpolat - Academia.edu (original) (raw)

Papers by Oğuz Akpolat

Studies in Surface Science and Catalysis, 1999

This chapter focuses on the shape selective catalysts, especially on ZSM-5 type zeolites, for the... more This chapter focuses on the shape selective catalysts, especially on ZSM-5 type zeolites, for the isomerization of m-xylene. The chapter discusses a novel catalyst that is selective for pxylene in the isomerization of m-xylene, to investigate the reaction mechanism and kinetics over the most selective catalyst using by a fixed bed catalytic reactor. In this work, gas-phase isomerization reaction of m-xylene was studied over various catalysts including Ni, Sn, Pt, Ga, Re or Zr in different amounts. Alumina and several types of zeolites have been employed as carriers. The catalysts prepared were characterized and the most selective catalyst was determined after a selectivity-screening test. The most selective catalysts were found to be the ones prepared over ZSM5 carriers and consisting of Ga and/or Pt as active components.

Trends in Agricultural Economics, 2008

Materials, methods & technologies, 2018

Hydrogels are attractive controlled delivery systems of drugs due to higher surface to volume rat... more Hydrogels are attractive controlled delivery systems of drugs due to higher surface to volume ratio compared to macroscopic systems. In the scope of the presented work, PEG-DA based spherical hydrogels were synthesized, characterized, and. in vitro controlled release kinetics of the drug from microspheres for different PEG-DA and photoinitiator ratios were investigated with various mathematical models. In the first part of the work, synthesis of PEG-DA based spherical hydrogels by free-radical photopolymerization method by using photoinitiator was done. Polyethylene glycol diacrylate (PEGDA) was used as macromer, ethylene glycol dimetacrylate (EGDMA) and 2,2 dimetoxy-2 phenylacetophenon (DMPA) were used as cross-linking agent and photoinitiator, respectively. In order to observe the effects of the amounts of the compounds, the ratios of the macromers was tested at 30 and 50 % by weight and photoinitiator ratio was arranged as 0.5 and 1 % by weight while cross-linker ratio was kept c...

Journal of Applied Sciences, 2008

The aim of this study is to optimize the physical parameters affecting the production of Haematoc... more The aim of this study is to optimize the physical parameters affecting the production of Haematococcus pluvialis in photobioreactors and to simulate the process. Heamatococcus pluvialis is a green microalgea to have a great interest for production of natural astaxanthin and it can be cultivated in a closed photobiorector system under controlled conditions. Biomass composition, growth rate and high value product spectra like polyunsaturated fatty acids, pigments, poly saccariydes or vitamins depend on strongly the parameters of cultivation process. These are composition of cultivation medium, mixing model and aeration rate, hydrodynamic stress of medium which can be changed by adding some chemicals, cultivation temperature, pH, carbon dioxide and oxygen supply and most important of all: illumination. One of the most important problems during the cultivation is that cells have sensitivity to shear stress very much and the shear stress created by aeration and mixing effects the growth rate of the cell negatively and decreases yield. In this study, physical parameters such as; the rate of the air fed into the reactor, the mixing type, the reduction of the hydrodynamic stress by CMC addition, the effect of the cell size on the cell production and the flocculation speed of the culture, were investigated.

Turkish Electronic Journal of …, 2004

... birbiriyle ilişkilendirilebilmesi (modellenmesi), bunun sonucu olarak da bu bilgilerin üretil... more ... birbiriyle ilişkilendirilebilmesi (modellenmesi), bunun sonucu olarak da bu bilgilerin üretildiği süreçlerin canlandırılabilmesi (simulasyonu) ve böylece önceden, süreçlerin öngörülüp denetim altında tutulabilmesini (kontrolünü) sağlayan yazılım programlarının (software) ve bu ...

ab.org.tr

... Oğuz Akpolat1 *, Fatma Ayhan 1 , Hakan Ayhan 2 ... 4. KAYNAKLAR [1] Erenler, A., Biyoenzimler... more ... Oğuz Akpolat1 *, Fatma Ayhan 1 , Hakan Ayhan 2 ... 4. KAYNAKLAR [1] Erenler, A., Biyoenzimler ve Biyoenzimlerin Örme Kumaş Özelliklerine Etkisi, Yüksek Lisans, Çukurova Üniversitesi, Adana, 2009, 100 s. [2] Körlü, A. , Altay, P., 2009. ...

Biotechnology(Faisalabad), 2007

Journal of Applied Sciences, 2007

Eskişehir Osmangazi Üniversitesi Mühendislik ve Mimarlık Fakültesi Dergisi, 2021

OZET Monte Carlo yontemi, olasilik teorisi uzerine kurulu bir sistemdir. Monte Carlo yonteminde i... more OZET Monte Carlo yontemi, olasilik teorisi uzerine kurulu bir sistemdir. Monte Carlo yonteminde istatistiksel ve matematiksel tekniklerle bir deneyi veya cozulmesi gereken bir fiziksel olayi rastlantisal sayilari defalarca kullanarak simule etmek esastir. Gunumuzde bu yontem, fizik ve matematik problemlerinin cozumunde ozellikle nukleer transport hesaplamalarinda iyi sonuclar vermektedir. Bu yontemden yararlanilarak hazirlanan bu calismada da , bir Aluminyum kutle boyunca ilerleyen γ -isinlarinin absorbsiyonu incelenmis ve kutle icerisinde bu isinlarin yutulmasi simule edilmis olup simulasyona iliskin hazirlanan algoritmanin cozumu MATLAB yazilimi kullanilarak gerceklestirilmistir. Anahtar kelimeler: gamma, isin, nukleer, simulasyon, monte carlo ABSTRACT Monte Carlo method bases on probability theory. Simulation of experimental data or physical transport phenomena uses random numbers by mathematical or statistical techniques in this method. Monte Carlo method gives good results for ...

The paper presents methods of the soils classification on the basis of DMT and CPT data obtained ... more The paper presents methods of the soils classification on the basis of DMT and CPT data obtained from Warsaw University of Life Sciences campus. The applied methods use the features selection such as Fast Correlation-Based Filter (FCBF), Fisher measure, Correlation-based Feature Selection (CFS) and the automatic classifiers in the form of Support Vector Machine (SVM) and k Nearest Neighbours to estimate the soil category. The starting point are the data from CPT and DMT probes in the form of m x n matrix. The results of experiments have shown that the proposed numerical features of similar nature are strongly related with the soils types. The features collected from the DMT tests are: the A pressure, required to just begin to, move the membrane ("lift-off"), the B pressure, required to move the center of the membrane 1.1 mm against the soil, a third reading C ("closing pressure") can also optionally be taken by slowly deflating the membrane soon after B is reache...

Monte Carlo yöntemi, olasılık teorisi üzerine kurulu bir sistemdir. Monte Carlo yönteminde istati... more Monte Carlo yöntemi, olasılık teorisi üzerine kurulu bir sistemdir. Monte Carlo yönteminde istatistiksel ve matematiksel tekniklerle bir deneyi veya çözülmesi gereken bir fiziksel olayı rastlantısal sayıları defalarca kullanarak simüle etmek esastır. Günümüzde bu yöntem, fizik ve matematik problemlerinin çözümünde özellikle nükleer transport hesaplamalarında iyi sonuçlar vermektedir. Bu yöntemden yararlanılarak hazırlanan bu çalışmada da , bir Aluminyum kütle boyunca ilerleyen γ-ışınlarının absorbsiyonu incelenmiş ve kütle içerisinde bu ışınların yutulması simule edilmiş olup simulasyona ilişkin hazırlanan algoritmanın çözümü MATLAB yazılımı kullanılarak gerçekleştirilmiştir.

Food Analytical Methods, 2015

Turkish Journal of Biochemistry, 2013

Glukoz oksidaz enzim agregatları kullanılarak β-Dglukozun parçalanma kinetiğinin modellenmesi [Mo... more Glukoz oksidaz enzim agregatları kullanılarak β-Dglukozun parçalanma kinetiğinin modellenmesi [Modelling of the β-D-glucose destruction kinetics by using glucose oxidase enzyme aggregates]

Journal of Applied Sciences, 2005