Assessment of spatial distribution patterns of soil properties in the EAARI-Experimental Station (Erzurum)

Defining spatial distribution patterns of soil properties within a field or watershed is important for site-specific soil and plant management. The objective of this study was to determine spatial distribution patterns of particle size distribution, organic matter, lime content, pH and plant-available P contents of soils in the Experimental Station of the Eastern Anatolia Agricultural Research Institution (EAARI). The research area, about 100 ha, was gridded with 100 m intervals in the north to south and east to west directions, and 68 soils samples were collected from 0-20 cm dept at each intersection. Exponential semivariogram models were fitted for clay, silt and sand contents and soil pH, Gaussion models for lime content and plant-available P, and spherical model for organic matter content. Block kriging analysis was performed to prepare distribution maps. Distribution patterns of soil properties studied showed great similarities with each other, as the patterns of yield

Time-dependent changes in distribution patterns of soil penetration resistance in a rangeland under overgrazing

Soil penetration resistance as an indication of soil compaction affects on soil infiltration and runoff. Overgrazed rangelands are under severe erosion risk because of compaction. The objective of this study was to determine changes in soil penetration resistance with time in a high altitude rangeland. A 5 ha rangeland (200x250 m) was transected with 25 m intervals, and soil penetration resistance was measured at every 5 m in each transect for 20 cm surface soil layer in three different time periods (15th of July, August and September). Undisturbed soil samples were taken for determining soil bulk density and soil moisture-penetration calibration tests, and these samples also were used to obtain fundamental soil characteristics. Exponential semivariogram models were fit to explain spatial variance in soil penetration resistance values. Distribution patterns of soil penetration resistance were defined using kriging values produced by the punctual kriging. Results indicated that soil penetration resistance was higher than the critical penetration resistance (3 MPa) for root growth in all measurement points. The mean soil penetration resistance increased about 9 % in August as compared with July and it was more or less constant in the following month. There were good agreements among the distribution patterns of soil penetration resistance obtained for different time periods

Synthesis of blue-shifted luminescent colloidal GaN nanocrystals through femtosecond pulsed laser ablation in organic solution

We demonstrate the synthesis of GaN nanocrystals (NCs) with the sizes of less than the doubled exciton Bohr radius leading quantum confinement effects via a single-step technique. The generation of colloidal GaN nanoparticles (NPs) in organic solution through nanosecond (ns) and femtosecond (fs) pulsed laser ablation (PLA) of GaN powder was carried out. Ns PLA in ethanol and polymer matrix resulted in amorphous GaN-NPs with the size distribution of 12.4 ± 7.0 and 6.4 ± 2.3 nm, respectively, whereas fs PLA in ethanol produced colloidal GaN-NCs with spherical shape within 4.2 ± 1.9 nm particle size distribution. XRD and selected area electron diffraction analysis of the product via fs PLA revealed that GaN-NCs are in wurtzite structure. Moreover, X-ray photoelectron spectroscopy measurements also confirm the presence of GaN nanomaterials. The colloidal GaN-NCs solution exhibits strong blue shift in the absorption spectrum compared to that of the GaN-NPs via ns PLA in ethanol. Furthermore, the photoluminescence emission behavior of fs PLA-generated GaN-NCs in the 295–400 nm wavelength range is observed with a peak position located at 305 nm showing a strong blue shift with respect to the bulk GaN. © 2016, Springer Science+Business Media Dordrecht

Thin film MoS2 nanocrystal based ultraviolet photodetector

We report on the development of UV range photodetector based on molybdenum disulfide nanocrystals (MoS2-NCs). The inorganic MoS2- NCs are produced by pulsed laser ablation technique in deionized water and the colloidal MoS2-NCs are characterized by transmission electron microscopy, Raman spectroscopy, X-ray diffraction and UV/VIS absorption measurements. The photoresponse studies indicate that the fabricated MoS 2- NCs photodetector (MoS2-NCs PD) operates well within 300-400 nm UV range, with diminishing response at visible wavelengths, due to the MoS2- NCs absorption characteristics. The structural and the optical properties of laser generated MoS2-NCs suggest promising applications in the field of photonics and optoelectronics. © 2012 Optical Society of America

Interpratation and adaptation of dermoscopic terminology to our language: Consensus report of the Turkish society of dermatology dermoscopy working group

"Dermoscopic Terminology Consensus Meeting" was held at Ege University Medical Faculty Dermatology Department on the 24th of February in 2012 with the aim of establishing a common language in the translation of the dermoscopic terminology in English literature into Turkish. In this article, the Turkish terminology in which the consensus was reached at that meeting is presented together with the definitions and representative images as a dictionary. © 2013 by Turkish Society of Dermatology

Thermal decomposition and gasification of biomass pyrolysis gases using a hot bed of waste derived pyrolysis char

Chars produced from the pyrolysis of different waste materials have been investigated in terms of their use as a catalyst for the catalytic cracking of biomass pyrolysis gases during the two-stage pyrolysis-gasification of biomass. The chars were produced from the pyrolysis of waste tyres, refused derived fuel and biomass in the form of date stones. The results showed that the hydrocarbon tar yields decreased significantly with all the char materials used in comparison to the non-char catalytic experiments. For example, at a cracking temperature of 800 °C, the total product hydrocarbon tar yield decreased by 70% with tyre char, 50% with RDF char and 9% with biomass date stones char compared to that without char. There was a consequent increase in total gas yield. Analysis of the tar composition showed that the content of phenolic compounds decreased and polycyclic aromatic hydrocarbons increased in the product tar at higher char temperatures

The application of sewing machine selection with the multi-objective optimization on the basis of ratio analysis method (MOORA) in apparel sector

There are a lot of different operations in transformation process from fiber to garment. Sewing is the last stage of this process and sewing machine is the most important tool in this process. In terms of competition in the market, the machines have to be optimal level in speed, price, energy consumption etc. subjects which will be purchased. Therefore, Multi-Objective Optimization on the Basis of Ratio Analysis Method (MOORA) is used in this paper which is one of the newest multi objective/criteria decision making methods and attained results were compared with Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) after that optimal machine was selected. © 2015 Ege Universitesi. All rights reserved

Effect of Boric Acid Content on the Structural and Optical Properties of MnS Films Prepared by Spray Pyrolysis Technique

Boron doped MnS films were obtained by the spray pyrolysis method using the boric acid ($H_3BO_3$) as dopant source at a substrate temperature of 350°C. The spray pyrolysis method has a wide range of application areas with a low cost well-suited for the manufacture of solar cells. The properties of boron doped MnS films were investigated as a function of doping concentration. The X-ray analysis showed that the films were polycrystalline fitting well with a hexagonal structure and have preferred orientation in the [002] direction. The optical band gap of the undoped and boron doped MnS films were found to vary from 3.38 to 3.20 eV. The changes observed in the energy band gap and structural properties of the films related to the boric acid concentration are discussed in detail