http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/15611 Thu, 23 Apr 2026 06:51:14 GMT 2026-04-23T06:51:14Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/16548 Logic And Gate Design With The Internet Of Things (IOT) Demirel, Günay; Canan, Emine In this study, a web-based "AND gate experiment platform" was designed using the ESP8266-based nodemcu, a popular component of the Internet of Things (IOT) and a key component of automation systems over the Internet and networks in recent years. The two-input AND gate is selected as one of the fundamental gates in digital electronics. This web-based platform, which provides interactive simulations and visual demonstrations of the AND gate's operation in classroom or laboratory environments, particularly in physics, electrical and electronics, and computer science departments, allows multiple users to connect to the nodemcu and practice simultaneously. Since the nodemcu is used in this study, the software connects the nodemcu to the local network via a modem and receives a fixed IP address. This allows each user connected to the IP address to individually simulate the operation of the AND gate through their web browser. Furthermore, by adjusting the modem settings, each user accessing the IP address over the internet can individually simulate the operation of the AND gate in their own web browser. The input and output values on the platform will be those of the last user performing the operation. This makes the platform also suitable for distance learning. Tue, 30 Sep 2025 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/16548 2025-09-30T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/16547 Investigating Earthquake Source Scaling Laws in the Akhisar Seismic Zone Demirci, Alper Spectral earthquake source parameters like corner frequency, fmax, stress drop and source radius are important parameters in terms of an earthquake’s source properties. In this study, the source parameters of 40 local earthquakes (3.5≤M≤5.0) were calculated using Matlab-based codes. From 2011 to 2017 a database belonging to broadband earthquake stations for earthquakes occured near the location of the 12 September 2016 Akhisar (Manisa) earthquake was created from the Kandilli Observatory and Earthquake Research Institute seismic station network. Displacement and acceleration spectra including P and SH waves were analysed with a Brune ω-2 source model. A total of 40 earthquakes had 1097 waveforms investigated and parameters belonging to each earthquake were manually calculated. For each source parameter, mean values were calculated according to the number of seismic stations used for each earthquake. Observational spectra had damping effect removed using the Qs quality factor previously determined for the region. Seismic moment values obtained for the earthquakes varied from 0.19×1015 and 36.19 ×1015 Nm (3.5 ≤ Mw ≤ 5) with corner frequency values from 1.01 Hz to 5.07 Hz for P phase and 0.69 Hz to 2.63 Hz for SH phase. Additionally, calculations for SH phase in a circular fracture area varied from 0.72 km2 to 11.12 km2, with analyses of P phase calculated from 0.4 km2 to 9.42 km2. Noting the two phase calculations, the stress drop of the sources appeared to vary from 0.02 Mpa to 1.37 Mpa. In conclusion, these source parameters calculated at local scale revealed empirical relation functions with great importance to represent the region and as input for other scientific studies and were compared with results obtained from other similar studies in the literature. Tue, 30 Sep 2025 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/16547 2025-09-30T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/16546 Experimental and Numerical Modal Analysis of Nomex Honeycomb Core Composite Sandwich Spherical Plate Şen, Murat; Yiğid, Osman This study investigated the dynamic properties of a spherical sandwich composite structure made of carbon fiber face sheets and a Nomex honeycomb core. The structure was produced using the hand lay-up method. The results from Experimental Modal Analysis (EMA) and the numerical model created in ANSYS showed high consistency. The natural frequency difference was only 0.73% for the second mode, with the largest discrepancy of 6.5% was observed in the first mode. These differences are thought to be related to structural variations from the manufacturing process, such as resin distribution, carbon fiber fabric stacking, and air voids and the experimental challenges such as double hit errors, measurement resolutions related to force sensor and accelerometer and environmental noise. The vibration damping capability of the sandwich structure was investigated. Some modes exhibited high damping, while others had relatively lower values. The highest and the lowest damping ratios were obtained as 0.83% for the third mode and 0.23% for the fourth mode. A numerical equivalent model of the structure was created in ANSYS to determine its natural frequencies and vibration modes, confirming its effectiveness in modeling complex structures. Tue, 30 Sep 2025 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/16546 2025-09-30T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/16545 Close Binary Open Cluster Systems: A Gaia DR3 Perspective on Alessi 36 and Collinder 135 Canbay, Remziye; Taşdemir, Seval; Çınar, Deniz Cennet; Karagöz, Hülya In this study, we examined the nearby open clusters (OCs) Alessi 36 and Collinder 135. Their spatial proximity was assessed using photometric and astrometric data from Gaia DR3. Likely member stars were identified based on a membership probability threshold (P ≥ 0.5), yielding 230 members for Alessi 36 and 342 members for Collinder 135. The mean proper-motion components (𝜇𝛼cos𝛿, 𝜇𝛿) were determined as (-9.681±0.072, 7.021±0.081) mas yr⁻¹ for Alessi 36 and (-10.061±0.083, 6.256±0.095) mas yr⁻¹ for Collinder 135, the parallax-based distances (d) were found to be 278±7 and 299±11 pc, while their estimated ages (t) were 39±5 and 36±5 Myr for Alessi 36 and Collinder 135, respectively. The Galactic orbital analysis of Alessi 36 and Collinder 135 reveals nearly circular orbits with low eccentricities and minor fluctuations in their apogalactic and perigalactic distances. The maximum heights they attain above the Galactic plane are 0.035±0.001 for Alessi 36 and 0.074±0.003 kpc for Collinder 135, respectively, supporting their classification as part of the young stellar disc population. Tue, 30 Sep 2025 00:00:00 GMT http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/16545 2025-09-30T00:00:00Z