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An Efficient Inductive Coil Link Design for Wireless Power Transfer to Visual Prostheses

100%
Celik M., Aydin E.
Acta Physica Polonica A
|
2017
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vol. 132
|
issue 3
535-537
EN
Powering therapeutic devices plays a crucial role in the design phase of implantable electronic units. Batteries could not provide sufficient charge storage, used for the lifetime of the device, considering the space available for them. As sophisticated surgical procedures are required with the possible trauma to the patient such as material discrepancy and tissue damage, replacement is quite risky and not an option. Thus, therapeutic devices, especially visual prostheses, receive power wirelessly through inductive coil links which are connected to a battery outside the body. An inductive link is based on the main principle that there are two components such as primary and secondary units. Although primary unit includes the battery outside the body, power transmitter, and control unit, secondary unit under the skin contains amplifier, rectifier regulators, and power control unit. In this study, an inductive coil link is modelled to evaluate fundamental design specifications for visual prostheses. Inductive coil link parameters are quantitatively investigated so that maximum power transfer efficiency and miniaturization, which are critically important for electronics placed in intraocular region, are provided. Considering 20 mm distance, it is concluded that the separation and the size of the coil pair, loop diameter, frequency have a major role to determine the system performance.
2
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Study of Bending Strength and Numerical Modeling of Wooden and Plywood Frame Elements

81%
Akgul T., Apay A., Aydin E., Sumer Y.
Acta Physica Polonica A
|
2015
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vol. 127
|
issue 4
1414-1416
EN
Modern Frame Systems have appeared by development of frame systems due to search for optimum cost and quality of construction, along with the increased number of multi-storey concrete construction today. Although the initial investment costs of the modern frame systems are high, there use has increased 50-100 times with respect to the traditional methods. With the modern frames, reduction or complete elimination of extra operations, such as cutting and sizing on site, have led to savings on workmanship and time. These systems aim at providing wide range of application in a short time by using minimum workmanship and, consequently, maximum number of application. This study explores, experimentally and numerically, the bending strength of wooden and plywood panels most frequently used for the construction today.
3
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Examination of the Energy Efficiency of Wall Building Elements Used in Dwellings

71%
Vural I., Akgul T., Aydin E., Aydin F., Saribiyik M.
Acta Physica Polonica A
|
2015
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vol. 127
|
issue 4
1417-1420
EN
In this study, within the scope of the number of studies related to the efficient use of energy increasing day by day, the thermal insulation performance of wall elements used in dwellings was determined using experimental methods. With this aim, a 1/3 scaled reinforced concrete structure with the complete characteristics of an actual structure, was built and the column spans were filled using six different types of wall element. These materials, widely used in dwelling production in Turkey, were applications of horizontal coring bricks, vertical coring bricks, pumice, gas concrete, block brick and a cavity wall. The interior temperature was kept constant by placing a thermal source inside the built sample construction and the temperatures for different exterior temperatures were measured with a thermocouple and camera from each wall surface. Thus, by interpreting the obtained surface temperature data, the energy efficiency of the wall types used was presented, the thermal conductivity resistance, thermal conductivity coefficient, and loss of heat as regards to TSE 825 were calculated and accordingly, the thermal conductivity performances of walls were compared.
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