Suchergebnisse

In a pivotal judgment delivered by the Grand Chamber, the European Court of Human Rights held that the conviction of a former teacher Yüksel Yalcinkaya violated Articles 6,7 and 11 of the Convention. The applicant Yalcinkaya was a teacher who was dismissed with an emergency decree enacted during the state of emergency rule between 2016 and 2018 and was subsequently prosecuted and convicted for his use of the ByLock app and for his membership in a teachers' union and an association which were also closed down with an emergency decree. In Erdogan's ever more repressive Turkey, usage of said app or membership in organizations and unions may lead to arrest. Especially anything that appears remotely related to the oppositional Gulen movement carries the risk of persecution.

The purpose of this study is to discuss the limitations encountered during the implementation of the argumentation method in the classroom environment. In the study containing qualitative data, the document analysis method was employed. The research data were obtained from scientific articles and theses containing the findings about the limitations of the argumentation method and were analyzed according to the descriptive analysis. In the collection of data, all stages were carried out in accordance with the document review, such as accessing documents, checking the authenticity of the documents, understanding the documents, analyzing and using the data. In the process of evaluating the data of the study, the observations, intuitions and experiences of the researchers along with the findings of the examined publications were taken into consideration. Based on the findings obtained from the examined documents, observation, practice and experience, some suggestions were made that could minimize the limitations of the argumentation method.

Mesh independence is a term used in numerical analysis and simulation to refer to a situation where the numerical solution of a problem is insensitive to changes in the size or density of the computational mesh used to discretize the problem domain. In other words, a numerical solution is said to be mesh independent if it remains stable and accurate even when the mesh is refined. This is important because the accuracy and stability of numerical simulations depend on the quality of the mesh used to discretize the problem domain. The shape, size, and number of meshes used while performing numerical modeling in accordance with flow physics in the solution of hydraulic problems significantly affect the result. In this study, a total of 12 experiments were carried out for 4 different discharge values (Q=5 L/s, 10 L/s,15 L/s and 20 L/s) for sharp-crested weirs with three different weir heights (P=20 cm, 30 cm and 40 cm). Numerical models of each experimental setup with four different mesh sizes (m=1.25 mm, 2.50 mm, 5.00 mm and 10.00 mm) were created with the ANSYS-Fluent program. Numerical analyses were performed using the grid resolution method to obtain a mesh size-independent result where the mesh size would not affect the results after the specified error rate.

Dams and hydraulic structures are used for the supply and control of water, which have great importance on human life. The sluice gate is one of the hydraulic control structures. Sluice gates release excess water from the reservoir to the downstream side in a controlled manner with a certain discharge for controlling the level of the reservoir. A hydraulic jump is created to dissipate the energy of flow coming from under the gates. A hydraulic jump occurs when the flow regime is changed from subcritical to supercritical. However, the position of the hydraulic jump in the channel should be known exactly to prevent damage to surrounding structures. In this study, an open channel system with a sluice gate is used to produce a hydraulic jump. Experiments are conducted for two different gate openings (a1=1.5 cm and a2=2 cm) and 16 discharge values. For each case, the position of the hydraulic jump is determined. In addition, flow depths at 5 different points were measured including before and after the hydraulic jump. The results obtained from the experimental study were compared with the numerical model in terms of the position of hydraulic jump and flow depths. According to the results obtained, the numerical model and the physical model showed between 80 and 91% consistency.

Broad crested weirs and steps are used to regulate the flow in the channel, increase the water level at the upstream side, and measure the discharge. The construction of the broad crested weirs is more practical and also they are more stable compared with the other types of weirs. To serve in accordance with the purpose of their construction, broad crested weirs should be designed and built by considering certain criteria. Before the hydraulic structures are built, model experimental setups are constructed in the laboratory and problems to be encountered are tried to be determined. However, there may be differences between the structure to be built in real life (prototype) and model due to scale effect. These possible differences must be determined and necessary measures must be taken. In this study, the model and prototype of the broad crested weir are constructed in two different open channel systems by using Froude similarity. The geometric similarity between model and prototype is determined as Lr = 4. 44 experimental data were collected from model and prototype. The results obtained from the model and prototype are compared according to hydraulic similarity rules. In addition to the physical experimental setups, numerical models were created using the ANSYS Fluent for the model and prototype separately. By comparing the numerical model and physical experimental setups, optimum mesh size is tried to be determined. According to the results obtained from experimental setups, differences were observed in the position of critical flow depths and downstream water levels due to scale effects.