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    Design of a New Parallel-Plate Capacitor to Increase the Capacity Value
    (2019) Ozturk, Turgut
    The demand for dielectric materials has increased rapidly since the energy storage systems have an important place in many areas such as medical, defense, military, telecommunication and aerospace applications. The interaction of the electromagnetic waves with matter provides valuable information about the stored energy by material. Hence, the capacitor as an example of energy applications, which owes its energy storage capability to the internal dielectric material, is designed by using Ansys Maxwell software program to indicate the dependence of the capacitance on the dielectric constant and different design. The relationship between energy storage capacity and different design is shown by using different structures which are parallel plate and multi layered models. Furthermore, a new model has been designed and analyzed to increase the performance of capacitance value of capacitor. It is aimed to increase the interaction between surface area of dielectric material and conductive pipes/wires with this operation.
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    Modified window function for optically thick samples measured by a terahertz time-domain spectroscopic system using a multimode laser diode
    (The Optical Society, 2021) Morikawa, Osamu; Hamada, Dai; Ozturk, Turgut; Yamamoto, Kohji; Kurihara, Kazuyoshi; Kuwashima, Fumiyoshi; Tani, Masahiko
    A low-cost type terahertz time-domain spectroscopic system can be constituted using a multimode laser diode instead of a pulse laser. To suppress noise, a window function is usually used in the Fourier transformation. When this system is used to measure an optically thick sample, the obtained refractive index shows sinusoidal structures. This is caused by ingress of a signal fragment into the measured range and egress of another signal fragment out of the measured range. In addition, a broad positive background component appears in the imaginary part of the refractive index. This is because of the decreased amplitude of the central structure of the signal, which results from the time shift under the window function caused by sample insertion. These false structures can be eliminated by using a modified window function that is shifted with the signal when the sample is inserted.