Time filter

Source Type

Eskisehir, Turkey

Anadolu University is a public university in Eskişehir, Turkey and the second largest university in the world by enrollment. Wikipedia.

Avan I.,Anadolu University | Dennis Hall C.,University of Florida | Katritzky A.R.,University of Florida
Chemical Society Reviews | Year: 2014

Peptidomimetics represent an important field in chemistry, pharmacology and material science as they circumvent the limitations of traditional peptides used in therapy. Self-structural organizations such as turns, helices, sheets and loops can be accessed by chemical modifications of amino acids or peptides. In-depth structural and conformational analysis and structure-activity relationships (SAR) offer a way to establish peptidomimetic libraries. Herein, we review recent developments in peptidomimetics that are formed via heteroatom replacement within the native amino acid backbone. Each sub-section describes structural features, utility and preparative methods. © 2014 the Partner Organisations. Source

Caglar Y.,Anadolu University
Journal of Alloys and Compounds | Year: 2013

Nanostructure ZnO and ZnO:Co films were deposited onto borofloat glass substrates by the sol-gel method using spin coating technique. X-ray diffraction (XRD) study was used to investigate the effects of cobalt dopant on the crystalline structure and orientation of the films. XRD observations showed that the crystalline quality of ZnO film decreased with increasing cobalt content. The effect of Co incorporation on the surface morphology was clearly observed from scanning electron microscopy (SEM) images. The chemical composition of the 3% Co doped nanostructure ZnO film was confirmed by X-ray photoelectron spectroscopy (XPS). The doping of ZnO with Co causes a decrease in particle size and crystallinity while it leads to an increase in the band gap, which changes in accordance with the Burstein-Moss effect. The optical constants of the films such as refractive index and extinction coefficient were determined using transmittance and reflectance spectra. The sheet resistance of the films, which was calculated using Van der Pauw method, first increased by about two orders of magnitude and then tended to decrease. © 2013 Elsevier B.V. All rights reserved. Source

Ilican S.,Anadolu University
Journal of Alloys and Compounds | Year: 2013

Undoped ZnO and Na doped ZnO (ZnO:Na) nanorod films have been deposited by sol-gel method using spin coating technique. The effect of Na incorporation on structural, morphological and optical properties of ZnO nanorod films was investigated. The nanorods were confirmed by the scanning electron microscopy (SEM) measurements. X-ray diffraction (XRD) measurement showed that the undoped ZnO nanorod film was crystallized in the hexagonal wurtzite phase and presented a preferential orientation along the c-axis. Only one peak, corresponding to the (0 0 2) phase, appeared on the diffractograms. Na incorporation leads to substantial changes in the structural characteristics of ZnO nanorod films. The chemical composition of the Na doped nanorod ZnO films was confirmed by X-ray photoelectron spectroscopy (XPS). Optical properties of the films were investigated with a double beam spectrophotometer with an integrating sphere. The absorption edge shifted to the lower energy depending on the Na content. The optical constants of these films, such as refractive index, extinction coefficient, optical dielectric constants and optical conductivity were determined using transmittance and reflectance spectra. The refractive index dispersion curve of the films obeys the single oscillator model. Optical dispersion parameters Eo and Ed developed by Wemple-DiDomenico were calculated. © 2012 Elsevier B.V. All rights reserved. Source

This article analyses some design parameters on the exergetic and energetic performances for a small turbojet engine for unmanned vehicles. On the basis of theoretical data employed, some exergetic and aerothermodynamics aspects of the engine and its components are parametrically studied in terms of compressor pressure ratio (π c) and turbine inlet temperature (T t4). The results show that mainly based on the operating parameters for 2<π c < 7, 1200 K < T t4 < 1500 K and thrust range values are in the range of 894-907 N, increasing turbine inlet temperature decreases the exergy efficiency of the small turbojet engine. However, any increase in compressor pressure ratio along with increase in flight Mach number results in an increasing exergy efficiency of the engine. Computer experiments were performed at 9000 m altitude with flight Mach number of 0.8 and 0.9. Studying these parameters indicates how much improvement is possible for the small turbojet engine to achieve better energy and exergy consumption. © 2012 Elsevier Ltd. Source

Cotton seed, as a biomass source, is pyrolysed in a tubular fixed-bed reactor under various sweeping gas (N 2) flow rates at different pyrolysis temperatures. In the non-catalytic work, the maximum bio-oil yield was attained as 48.30% at 550°C with a sweeping gas flow rate of 200mLmin -1. At the optimum conditions, catalytic pyrolysis of biomass samples was performed with various amounts of MgO catalyst (5, 10, 15, and 20wt.% of raw material). Catalyst addition decreased the quantity of bio-oil yet increased the quality of bio-oil in terms of calorific value, hydrocarbon distribution and removal of oxygenated groups. It was observed that increasing the amount of catalyst used, decreased the oil yields while increased the gas and char yields. Bio-oils obtained at the optimum conditions were separated into aliphatic, aromatic and polar sub-fractions. After the application of column chromatography, bio-oils were subjected into elemental, FT-IR and 1H NMR analyses. Aliphatic sub-fractions of bio-oils were analyzed by GC-MS. It was deduced that the fuel obtained via catalytic pyrolysis mainly consisted of lower weight hydrocarbons in the diesel range. Finally, obtained results were compared with petroleum fractions and evaluated as a potential source for liquid fuels. © 2010 Elsevier Ltd. Source

Discover hidden collaborations