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Elastic-plastic stress analysis of symmetric reinforced thermoplastic matrix laminated beams under a bending moment

100%

Callioglu H. , Aksoy S. , Topcu M. , Arman Y.

International Journal of Applied Mechanics and Engineering

2003

tom Vol. 8, no 4

559-575

In this study, an elastic-plastic stress analysis is carried out on symmetric steel fiber reinforced high density polyethylene thermoplastic matrix laminated beams under a bending moment. The Bernoulli-Euler theory is used. The orientation angles are chosen as (90o/0o)2, (30o/-30o)2, (45o/-45o)2 and (60o/-60o)2. The composite material is assumed to be linearly hardening. The stress component 'sigma'x is to be maximum at the upper and lower surfaces in the elastic-plastic solution. The residual stress component 'sigma'x is found to be highest at the upper and lower surfaces. However, when the plastic region is further expanded the residual stress component 'sigma'x is found to be the highest at the elastic and plastic boundaries. The plastic flow is to be maximum at the upper and lower surfaces for the (30o/-30o)2 orientation. The transverse displacement is obtained to be highest at the free end for the (90o/0o)2 orientation.

Online Control of SVC Using ANN Based Pole Placement Approach

100%

Köse E. , Abaci K. , Aksoy S.

Przegląd Elektrotechniczny

2012

tom R. 88, nr 7a

33-37

In this study, an online Artificial Neural Networks based Pole Placement algorithm is proposed to stabilize the 2-bus system with nonlinear SVC and variable power. It uses pole placement method. Proposed algorithm are examined in point of improving the bus voltages which change under different demanding powers and the temporary state performance are compared with PID control based results. Simulation results demonstrate a good performance and robustness.

W artykule zaprezentowano online algorytm Pole Placement z wykorzystaniem sieci neuronowych do stabilizacji dwu-szynowego systemu z nieliniowym, SVC (Static Var Compensator) i zmienną mocą.

Assessment of paranasal sinus parameters according to ancient skulls’ gender and age by using cone-beam computed tomography

75%

Demiralp K. O. , Kursun Cakmak S. , Aksoy S. , Bayrak S. , Orhan K. , Demir P.

2019

tom 78

nr 2

Background: The aim of this study was to determine whether paranasal sinus dimensions and volume can be useful to identify gender and age estimation for ancient skulls using cone-beam computed tomography (CBCT) images. Materials and methods: CBCT scans of 32 ancient skulls of approximately 1000 years of age were included in this retrospective study. The gender and age estimation of the skulls were made by an independent anthropologist, which was considered as the gold standard. Paranasal sinuses’ dimensions (width and height) and volumes of each sinus were measured from the CBCT data set that was linked to the three-dimensional rendering software (Anatomage, Invivo 5.2). All measurements were performed by an independent observer. Intra-observer analysis was made. Mann-Whitney and Kruskal-Wallis tests were used to compare paranasal sinus parameters in terms of age estimation and gender (p < 0.05). Results: The results demonstrated no statistically significant difference between measurements (p < 0.05). The measurements were found to be highly reproducible. The mean volumes of frontal and sphenoid sinus were found to be higher in males. The distance from anterior-posterior wall of sphenoid sinus in axial sections is larger in males (p > 0.05). The frontal sinus width and volume increased statistically with age above 60 years of age (p > 0.05). Conclusions: The paranasal volume and dimensions’ measurements from CBCT data can be a promising technique to determine gender and age of ancient skulls because of its lower voxel sizes and higher resolution. (Folia Morphol 2019; 78, 2: 344–350)