Cengiz Akay

Bursa Uludağ Üni̇versi̇tesi̇ · Department of Physics

The voltage values used in an IV measurement often depend on the specific electronic components being tested. For example, to test a solar cell, voltage values in the range of-3 V-3 V are sufficient, while for an LED this value is in the range of 0 V-12 V. However, sometimes applying a voltage can change the electronic properties of a system under...

This study devotes to the design and fabrication of a spin coating equipment using locally available materials for the deposition of uniform thin films on several substrates and also the production of organic light emitting diodes (OLEDs) using this home-made device. The equipment consists of a brushed direct current (BDC) motor with high speed, ch...

Capacitors with high voltage and capacity values are used in most induction coilguns that are designed and constructed. The fact that capacitors are quite bulky and slow in energy transfer and how a coilgun can be made without using capacitors is the study subject of this article. Two and four coil gun samples were made to find the essential compon...

This study focuses on the comparison of two different types of EEG electrodes (the first B10-S-150 Ag/AgCl sintered ring electrode with 1, 5 mm touch proof safety socket and 150 cm heavy-duty lead wire and the second, B12-LS-100 Ag/AgCl sintered FE-electrode with 100 cm light-duty lead wire and 1, 5 mm touch proof safety socket with 5 kΩ resistor n...

Transition metal-doped diluted semiconductor materials have attracted significant interest in spintronic applications. In order to investigate the structural, optical, electrochemical, and magnetic properties of these diluted magnetic semiconductors, transition metal-doped ZnO thin films were successfully produced at room temperature using a low-co...

We designed a homemade dip coater controlled by an Arduino microcontroller to produce semiconductor metal oxide films such as ZnO, CoO, and NiO. The developed device was successfully used to deposit ZnO film on a glass substrate. The structural, surface, and optical properties of the film were investigated. XRD patterns showed that the film is pred...

In 2023, a 7.7 magnitude earthquake occurred in the Pazarcık district of Kahramanmaraş on 6 February. After this earthquake, a second earthquake occurred at 13.24. The magnitude of the earthquake, whose epicenter was in the Elbistan district of Kahramanmaraş, was recorded as 7.6. After these two earthquakes, discussions gained momentum that earthqu...

Magnetic imaging systems used today are quite expensive and are generally used for medical purposes. Apart from this purpose, there are many scientific fields of study whose internal structure is desired to be displayed. Especially in science, different from the techniques used to understand the internal structure of matter, magnetic imaging techni...

We have fabricated undoped ZnO and Mn-doped ZnO thin films on glass substrates using sol-gel spin coating method and investigated their structural, optical, magnetic and magnetoresistance properties depending on the Mn doping ratio. X-ray diffraction (XRD) patterns showed that all the films under study are predominantly crystalized in a single-phas...

Optoelectronic light-emitting diode-photodiode pairs based on multi component GaInAsSb have been re searched and created dual-wavelength model of a new type optical moisture meter. Such pairs are able to detect" absorption bands of water belonging to the spectral range 1.94-2.7 f..I.m. Have been shown that, these pairs are very promising for new ty...

This study devotes to the design and fabrication of a spin coating equipment using locally available materials for the deposition of uniform thin films on several substrates and also the production of organic light emitting diodes (OLEDs) using this home-made device. The equipment consists of a brushed direct current (BDC) motor with high speed, ch...

The magnetic particle spectrometer (MPS) uses the nonlinear response of super-paramagnetic iron oxide nanoparticles and magnetic saturation at certain magnetic field values. A time-varying magnetic field of excitation coils causes the magnetization of the particles to vary between the maximum and the minimum value. Generally, there are two ways in...

Nuclear magnetic resonance and dynamic nuclear polarization experiments were performed to study suspensions of asphaltene in the fluorocarbons at a low magnetic field of 1.53 mT, at room temperature. The asphaltene was extracted from MC800 liquid asphalt, which was of Heavy Iran origin. The elemental composition and the surface morphology of the as...

In this study, Overhauser effect (OE) type of dynamic nuclear polarization (DNP) experiments were performedto study suspensions of MC800 asphaltene in bromopentafluorobenzene, chloropentafluorobenzene and hexafluo-robenzene aromatic solvents. The experiments were performed at a low field of 1.53 mT in a double-resonancenuclear magnetic resonance (N...

Weak field NMR and double resonance spectrometers are mostly homemade. In this work, some electronic units of such a spectrometer operating at 1.437 mT were designed and realized by includ­ing new integrated circuits: an audio generator, digital sweep generator, digital additional field and delay unit, Quartz generator, NMR detector(Q-meter), AF-na...

In this work, a sensor has been constructed to detect molecules such as vapor, CO2 stream and smoke (tobacco) in the air by using an optical device with two pair led-photodiode. The working principle of the optical device is based on blocked beams.

Nuclear Magnetic Resonance (NMR) and the Overhauser Effect (OE) type Dynamic Nuclear Polarization (DNP) were used to study MC-30 liquid asphalt in a weak magnetic field of 1.437&#114mT. Intermolecular spin-spin interactions occur between diffusing nuclear spins in the suspending fluid medium and unpaired electron spin in the liquid asphalt. Benzene...

Nuclear Magnetic Resonance (NMR) and the Overhauser Effect (OE) type Dynamic Nuclear Polariza tion (DNP) were used to study MC-30 liquid asphalt in a weak magnetic field of 1.437 mT. Intermolecular spin-spin interactions occur between diffusing nuclear spins in the suspending fluid medium and unpaired electron spin in the liquid asphalt. Benzene, t...