Yuzuncu Yll University

Van, Turkey

Yuzuncu Yll University

Van, Turkey
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Guler C.,Yuzuncu Yll University
Journal of Educational Computing Research | Year: 2017

The aim of this study is to investigate the use of WhatsApp application in anonymous peer assessment in higher education. The mobile phone application WhatsApp was used as both an anonymous and nonanonymous peer assessment tool in a classroom environment. The participants of the study were the students of two classes (sophomores and juniors), half of which were assigned to the anonymous peer assessment group and the other half to the nonanonymous peer assessment group for each class. The members of the anonymous groups used the personal messaging function of WhatsApp for assessment, whereas the nonanonymous groups used the group chat function of the application. WhatsApp was confirmed to be a valid tool for peer assessment, and it was shown that the required anonymity of the method was appropriate for the task. The students' perceived attitudes toward the procedure were found to be rather high, with no significant difference identified between the sophomores and junior groups related to the procedure. © SAGE Publications.


Aglrtas M.S.,Yuzuncu Yll University
Heterocyclic Communications | Year: 2017

Synthesis and characterization of 5,5′-bi(1,10-phenanthroline) (3) are described. Compound 3 was obtained by treatment of 5-chloro-1,10-phenanthroline (1) with 4-hydroxy- phthalonitrile (2) in the presence of K2CO3 as a base in DMF at room temperature for 25 h. © 2017 Walter de Gruyter GmbH, Berlin/Boston.


Durak H.,Yuzuncu Yll University
AIP Conference Proceedings | Year: 2017

Biomass based raw materials can be converted into the more valued energy forms using biochemical methods such as ethanol fermentation, methane fermentation and the thermochemical methods such as direct combustion, pyrolysis, gasification, liquefaction. The bio-oil obtained from the biomass has many advantages than traditional use. Firstly, it has features such as high energy density, easy storage and easy transportation. Bio-oil can be used as a fuel in engines, turbines and burning units directly. Besides, it can be converted into products in higher quality and volume via catalytic cracking, hydrodexygenation, emulsification, and steam reforming [1,2]. Many organic solvents such as acetone, ethanol, methanol, isopropanol are used in the supercritical liquefaction processes. When we think about the cost and effects of the organic solvent on nature, it will be understood better that it is necessary to find solvent that are more sensitive against nature. Here, water must have an important place because of its features. Most important solvent of the world water is named as "universal solvent" because none of the liquids can dissolve the materials as much as done by water. Water is found much at the nature and cost of it is very few when compared with the other solvent. Hydrothermal liquefaction, a thermochemical conversion process is an effective method used for converting biomass into the liquid products. General reaction conditions for hydrothermal liquefaction process are the 250-374°C temperature range and 4 - 22 Mpa pressure values range, besides, the temperature values can be higher according to the product that is expected to be obtained [3,4]. In this study, xanthium strumarium plant stems have been used as biomass source. The experiments have been carried out using a cylindrical reactor (75mL) at the temperatures of 300°C. The produced liquids at characterized by elemental analysis, GC-MS and FT-IR. According to the analysis, different types of compounds were identified by GC-MS. © 2017 Author(s).


Durak H.,Yuzuncu Yll University
AIP Conference Proceedings | Year: 2016

Supercritical liquefaction process is used for producing energy from biomass. The common reaction conditions for supercritical liquefaction process are the 240-380 oC temperature range and 5-20 Mpa pressure values range. Agaricus versicolor (L.) was liquefied by acetone in an autoclave (75 mL) under high pressure with (aluminium oxide and calcium hydroxide) and without catalyst at 290 °C for producing bio-oil. The products of liquefaction (bio-oil) were analysed and characterized using various methods including elemental analysis, Fourier transform infrared spectroscopy and gas chromatography-mass spectrometry. GC-MS identified 27 different compounds in the bio-oils obtained at 290 °C. © 2016 Author(s).


Karakus M.,Yuzuncu Yll University
AIP Conference Proceedings | Year: 2016

The space of all sequences a = (ak) for which ∥a∥q= kk|Δ2ak|+supk|ak|<∞ is denoted by q. Here, Δak = ak - ak+1 and Δmak = Δ(Δm-1ak) = Δm-1ak - Δm-1ak+1 with Δ0ak = ak, m ≥ 1. If a = (ak) ϵq then kΔak → 0 (k → ∞) and q ⊂ bv, the space of all sequences of bounded-variation, since k| Δak |≤ kk| Δ2ak | In this study, we give a generalization of quasi-convex bounded sequences. © 2016 Author(s).


Durak H.,Yuzuncu Yll University
AIP Conference Proceedings | Year: 2016

Supercritical fluid extraction is used for producing bio-fuel from biomass. Supercritical fluid extraction process under supercritical conditions is the thermally disruption process of the lignocellulose or other organic materials at 250-400 °C temperature range under high pressure (4-5MPa). Supercritical fluid extraction trials were performed in a cylindrical reactor (75mL) in organic solvents (acetone, ethanol) under supercritical conditions with (calcium hydroxide, sodium carbonate) and without catalyst at the temperatures of 250, 275 and 300 °C. The produced liquids at 300 °C in supercritical liquefaction were analyzed and characterized by elemental, GC-MS and FT-IR. 36 and 37 different types of compounds were identified by GC-MS obtained in acetone and ethanol respectively. © 2016 Author(s).


Kayar Z.,Yuzuncu Yll University
AIP Conference Proceedings | Year: 2017

We obtain Sturm Picone type comparison theorems for nonlinear impulsive differential equations. Our results cover the previous results existing in the literature and useful in investigating qualitative behaviour of solutions of such equations. © 2017 Author(s).


Arabaci M.,Yuzuncu Yll University | Snalan S.,Yuzuncu Yll University
AIP Conference Proceedings | Year: 2016

Lactococcosis, yersiniosis, listenollosis and cold water disease agents are frequently observed in Turkey as bacterial fish pathogens. Bacterial fish pathogens have high mortality prognosis, causing significant economic losses for the businesses. Use of molecular methods in substantiation of disease factors became prevalent in recent years. These methods have a significant role in fast diagnosis and early treatment of fish diseases. In the present study, 8 rainbow trout samples were obtained from each of 19 rainbow trout farms located in Van province, Turkey and registered with Food, Agriculture and Livestock Ministry. Total genomic DNAs were isolated from kidney tissues of sampled rainbow trout. Obtained DNAs were analyzed with real-time PCR there is/not (+/-) analysis using disease specific primer pairs for each disease. Molecular diagnosis of lactococcosis pathogen in 4 farms out of 19 rainbow trout farms active in Van province, and yersiniosis pathogen in 1 farm were made as a result real-time PCR analysis. Listenollosis and cold water pathogens were not molecularly observed. Results of the present study demonstrated that the region was safe for bacterial fish pathogens of cold water disease and listenollosis, which are observed frequently in Turkey, and there were deficiencies in preventive measures against lactococcosis and yersiniosis and fish transfer was a significant reason for the prevalence these diseases. © 2016 Author(s).


Ozdag R.,Yuzuncu Yll University
2016 24th Signal Processing and Communication Application Conference, SIU 2016 - Proceedings | Year: 2016

The establishment of wireless connection area and the continuation of it have been a significant problem in Wireless Sensor Networks (WSN) up to now because WSNs enable us to watch various environments with military and civil applications and at the same time, they give the opportunity of evaluating the information gained from such environments through the transmission of it to a certain control point. Thus, k-coverage problem in dynamic deployment of sensor nodes in WSNs is one of the reasons that affetcs the performance and the continuity of the network. For this reason; the algorithm Maximum Target Detection Algorithm based on Electromagnetism-Like (MTDA-EM), which enables us to detect all the targets in the related area at maximum level and additionally provides the dynamic deployment of the sensors with overlap of the minimum number of nodes, has been proposed. MTDA-EM has been improved based on Electromagnetism-Like (EM) algorithm which is metaheuristic. The aim in proposed MTDA-EM; is to decrease the energy consumption of the nodes and increase the lifetime of the network by optimizing the k-coverage degrees of the sensors while the dynamic deployment of the nodes in the related area is being made. Simulation results; it has been observed that the improved MTDA-EM has provided optimum results in terms of solving the problems of k-coverage. © 2016 IEEE.


Ozdemir O.F.,Yuzuncu Yll University | Arasoglu A.,Yuzuncu Yll University
EPJ Web of Conferences | Year: 2015

Oxygen is one of the elements which interacts with emitted neutrons after fission reactions. Oxygen exists abundantly both in nuclear fuel (UO2) and moderators (H2O). Nuclear reactions of oxygen with neutrons are important in terms of stability of nuclear fuel and neutron economy. In this study, equilibrium and pre-equilibrium models have been used to calculate (n,p), (n,d), (n,2n) and (n,α) nuclear reaction cross-sections of 16O. In these calculations, neutron incident energy has been taken up to 40 MeV. Hybrid and Standard Weisskopf-Ewing Models in ALICE-2011 program, Weisskopf-Ewing and Full Exciton Models in PCROSS program, and Cascade Exciton Model in CEM03.01 program have been utilized. The calculated results have been compared with experimental and theroretical cross-section data which are obtained from libraries of EXFOR and ENDF/B VII.1. © 2015 Owned by the authors, published by EDP Sciences.

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