Time filter

Source Type

Bitlis, Turkey

Aydin M.C.,Bitlis Eren University
Advances in Engineering Software | Year: 2012

Side weirs are extensively used in the hydraulic and environmental engineering applications. The modeling of free surface flow over a labyrinth side weir is a sophisticated problem in the hydraulic engineering. The water surface profiles over the triangular labyrinth side weirs were investigated by many of the researchers experimentally and theoretically. In this study, the free surface flow over the triangular labyrinth side weir was modeled by using Volume of Fluids (VOF) method to describe the flow characteristics in subcritical flow conditions. A valid method, Grid Convergence Index (GCI) was used to determine the numerical uncertainty of the simulation results. The simulation results were compared with experimental observations, and good agreements were obtained between the both results. © 2011 Elsevier Ltd. All rights reserved. Source

Aykut S.,Bitlis Eren University
Acta Polytechnica Hungarica | Year: 2011

Castamide, a kind of casting polyamide, is widely used in industry because of its light weight and high corrosion resistance, and because of its impact-resistant, oil-free and silent operation. The scope of its usage has been increasing. It is used in the packaging, textiles, chemicals, leather, construction and heavy machinery manufacturing sectors. Particularly, in the manufacture of machine parts like gears surface roughness of which is crucial, it has superseded many metals because it is important to be able to predict the surface roughness to get more qualified materials. The aim of this study is to predict the surface roughness of Castamide material after machining process using ANN (artificial neural network). In this study, experiments on Castamide were done in CNC milling using high speed steel and hard metal carbide tools. The cutting parameters (cutting speed, feed rate and depth of cut) were changed and the average surface roughness (Ra, μm) values were obtained. In the experiments, the effects of cutting tools with the same diameters, but with different cutting edges and tool materials on average surface roughness were also investigated. The data were used to train and test a dynamic ANN model. It is quite clear from the model results that the surface roughness predicted by the ANN model matches well with the training data as well as the test data. The developed model has managed to is to the surface roughness with correlation rate of 83.6% and minimum error rate of 0.02. Source

Balo S.N.,Firat University | Sel N.,Bitlis Eren University
Thermochimica Acta | Year: 2012

The effects of thermal aging at a constant temperature above A f (austenite phase finish temperature) on the martensitic transformation of the CuAlNi shape memory alloy were investigated. The evolution of the transformation temperatures was studied by differential scanning calorimetry (DSC). It was found that the thermal aging at a constant temperature above A f has a complex effect on the transformation parameters of the CuAlNi shape memory alloy. The M s, M f, A s, and A f transformation temperatures were shifted by the thermal annealing. The thermodynamic parameters such as Gibbs free energy and the elastic strain energy of the alloy experienced a decreasing tendency with increasing the aging time. The structural properties of aged alloy samples were studied by X-ray diffraction measurements at room temperature. It was found that the phase transformation parameters of the alloy are controlled by the crystallite size effect. © 2012 Elsevier B.V. All rights reserved. Source

Hayta S.,Bitlis Eren University | Polat R.,Giresun University | Selvi S.,Balikesir University
Journal of Ethnopharmacology | Year: 2014

Ethnopharmacological relevance This study has identified not only the wild plants collected for medical purposes by local people of ElazIǧ Province in the Eastern Anatolia Region, but also the uses and local names of these plants. These resources are usually regarded as part of a culture's traditional knowledge. Therefore, the aim of this study is to collect information from local population concerning the use of medicinal plants of the ElazIǧ region; identify the most important medicinal plants used; determine the relative importance of the species surveyed and calculate the informant consensus factor (FIC) in relation to medicinal plant use. Materials and methods A field study had been carried out for a period of approximately 2 years (2012-2013). A questionnaire was administered to the local people, through face-to-face interviews (Appendix A). Demographic characteristics of participants, names of the local plants, their utilized parts and preparation methods were investigated and recorded. The plant species were collected within the scope of the study; herbarium materials were prepared; and the specimens were entitled. The collected data were used to calculate the FIC and the plant use values. Results 74 Plants were found to be used for medical purposes before in the literature analysis of the plants used in our study, while 6 plants were found to have no literature records. Our results showed that the highest use values were recorded for the species Urtica dioica L. (0.46) and Rosa canina L. (0.42), while the highest FIC was cited for skin diseases (0.60). Conclusion Data obtained showed that in the studied area the folk use of plants is alive and still derives from daily practice. Evaluation of pharmacological activity for the promising medicinal plants is suggested. © 2014 Elsevier Ireland Ltd. Source

Aygun M.,Bitlis Eren University
Communications in Theoretical Physics | Year: 2013

In the present paper, the elastic scattering of 6Li + 209Bi system is reanalyzed by using the double folding model (DFM) at energies near the Coulomb barrier (ELab = 29.9 and 32.8 MeV). With this goal, a new density distribution of 6Li nucleus, the no-core full configuration (NCFC) density distribution (DD), is used to obtain the real potentials in DFM calculations. The NCFC DD results are compared with the results of both gaussian shape (GS) DD and an earlier study as well as the experimental data. This comparison provides information about the similarities and differences of the models used in calculations. © 2013 Chinese Physical Society and IOP Publishing Ltd. Source

Discover hidden collaborations