Ejons International Journal on Mathematic, Engineering and Natural Sciences

First TESS Light Curve Solution and Orbital Period Analysis of LT Aur

Oğuz ÖZTÜRK, Ahmet ERDEM, Derya SÜRGİT — Wed, 17 Dec 2025 00:00:00 +0300

In this study, light curve of LT Aur eclipsing binary star system obtained from Transiting Exoplanet Survey Satellite (TESS) observations is solved for the first time. In addition, orbital period analysis of the system is also presented for the first time. As a result of the light curve analysis, it is concluded that LT Aur is a semi-detached binary star system. Using the light curve solution parameters, the absolute parameters of the system are estimated as , , . Orbital period analysis of LT Aur shows that the orbital period of the system is increasing regularly at a rate of 1.310±0.253 s/year. Considering that this increase in the orbital period may be due to a dominant mass transfer mechanism from the low-mass secondary component to the high-mass primary component, the mass transfer rate onto the primary component is estimated to be between /year and /year.

First TESS Light Curve Anaysis of Eclipsing Binary Star KP And

Oğuz ÖZTÜRK, Ahmet ERDEM, Derya SÜRGİT — Wed, 17 Dec 2025 00:00:00 +0300

The light curve of KP And eclipsing binary star system, which lacks a detailed photometric study in the literature, obtained from Transiting Exoplanet Survey Satellite (TESS) observations, was first modeled in this study. The updated light element was obtained using the minimum times calculated from the TESS observations of the system. The solution revealed that the KP And system is a detached binary star system. Using the light curve solution parameters, the absolute parameters of the system were estimated as M_1=1.67±0.17 M_⊙, R_1=2.20±0.14 R_⊙ and M_2=0.36±0.10 M_⊙ , R_2=1.56±0.26 R_⊙.

Spectroscopic and Photometric Data Analysis of GT Eri

Derya SÜRGİT, Aslı BOLAT — Wed, 17 Dec 2025 00:00:00 +0300

In this study, the photometric and spectroscopic observational data analysis of the Algol-type binary system GT Eri, selected from the southern hemisphere sky, is presented. The spectroscopic observations of GT Eri were carried out during the 2012–2013 and 2022 observing seasons at the South African Astronomical Observatory (SAAO), using the 1.9 m Cassegrain telescope equipped with SITe and SpUpNIC CCD cameras and a slit (grating) spectrograph. For the photometric analysis of GT Eri, data from the Transiting Exoplanet Survey Satellite (TESS) were used. The spectroscopic data reduction and the determination of the radial velocity curve of the primary component were performed using the packages available within the IRAF software. The photometric analysis of GT Eri was done with the Wilson–Devinney method. By combining the results of the photometric and spectroscopic data analyses, the absolute parameters of the binary system were determined, and its evolutionary status was interpreted.

Various Priming Applications in Soybean (Glycine max L. Merr.) Seeds

Vugar GURBANOV, Yusif OSMANLI, Muhammet Anıl AYDIN, Gülsüm ÖZTÜRK, Mizgin MEHMET — Wed, 17 Dec 2025 00:00:00 +0300

This study was conducted to determine the effects of different pre-treatments on the germination power and mean germination time of soybean. The experiment was carried out in 2025 at the Ege University Seed Technology Application and Research Center (TOTEM) laboratories. In the study, GA₃ (500 mg L⁻¹), KNO₃ (2 g L⁻¹), PEG 6000 (300 g/L⁻¹), and combinations of these substances (PEG 6000 + KNO₃, PEG 6000 + GA₃) were applied to the seeds as pre-treatments. The experiment was arranged in a completely randomized design. As a result of the germination tests conducted under laboratory conditions, the highest germination power was obtained with the PEG 6000 + GA₃ application at 93.00%. The shortest mean germination time was determined to be 2.58 days in the PEG 6000 + GA₃ application. In conclusion, it was observed that the application of osmopriming (PEG 6000) in combination with hormones and inorganic salts had a positive effect on germination and emergence on soybean seeds.

Some Seed Pre-Treatments on Germination Performance and Seed Quality Improvement in Black Cumin (Nigella sativa L.) Seeds

Wed, 17 Dec 2025 00:00:00 +0300

This study was conducted to determine the effects of different pre-sowing treatments on the germination percentage and mean germination time of black cumin (Nigella sativa L.) seeds. The experiment was established in 2025 under laboratory conditions at the Ege University Seed Technology Research and Application Center (TOTEM), using a Completely Randomized Blok Design with three replications. The treatments included GA₃ (500 mg L⁻¹), KH₂PO₄ (2 g L⁻¹), PEG 6000 (300 g L⁻¹), and their combinations (PEG 6000 + GA₃ and PEG 6000 + KH₂PO₄), which were applied as seed priming treatments. Following the treatments, germination tests were carried out in accordance with ISTA rules in terms of the germination percentage and mean germination time. The results showed that there were statistically significant differences among treatments in terms of both germination percentage and mean germination time. The highest germination percentage (88.67%) and the shortest mean germination time (3.99 days) were obtained from the PEG 6000 + KH₂PO₄ treatment. Other effective treatments included PEG 6000 + GA₃ (80.00% – 4.48 days) and KH₂PO₄ alone (80.67% – 7.03 days). In conclusion, KH₂PO₄ and GA₃, particularly when combined with PEG 6000, were found to be effective pre-sowing treatments for promoting faster and more uniform germination in black cumin seeds.

Be My Home in Smart Cities: A Mobile Application for Stray Animal Tracking, Adoption and Shelter Management

Hacer Sueda EFE, Gizem YILDIZ, Önder YAKUT — Wed, 17 Dec 2025 00:00:00 +0300

The management, monitoring, and welfare of stray animals in Turkey has become more challenging due to the increasing population, rapid urbanization, and uncontrolled breeding. The increase in the number of stray animals leads to numerous problems such as traffic accidents, diseases, animal attacks, and environmental pollution, while the current shelter capacity remains insufficient. In this study, within the context of the smart city concept, the Be My Home mobile application has been developed for the management, tracking, and adoption of stray animals in smart cities. The Be My Home mobile application was developed in Java using Android Studio, while Firebase infrastructure was employed for data management. The system offers various features such as animal profiles, health and vaccination tracking, adoption, announcements and lost/found notifications, shelter reviews, shelter statistics, real-time data synchronization, location-based announcement filtering, and shelter management. Tests show that the application can be used effectively by both individual users and shelter officials. As a result, the developed mobile application has the potential to contribute to the smart city vision by enhancing stray animal welfare, enabling sustainable population management, modernizing shelters, and fostering responsible citizen participation.

Investigating Pre-Service Teachers’ Instrumented Action Schemes Related to Inverse Functions

Naz MARDANİ, Menekşe Seden TAPAN BROUTİN — Wed, 17 Dec 2025 00:00:00 +0300

This study aims to examine pre-service teachers’ processes of representing inverse functions and the instrumental genesis that emerges during these processes. Focusing on the instrumented action schemes developed for writing and graphing inverse functions in both paper-and-pencil and dynamic geometry environments, the study evaluates the contribution of technological tools to mathematics teaching. The research was conducted with six pre-service elementary mathematics teachers enrolled in the second year of a public university in Türkiye. Data were collected through worksheets, written and oral interviews, screen recordings, and audio recordings, and were analyzed using content analysis. The data were coded, categorized, and organized into themes within the framework of the components of the instrumental approach, then interpreted in line with the research purpose. The findings revealed that the instrumented action schemes developed by pre-service teachers in the paper-and-pencil environment remained at an operational level, whereas in the Cabri-Geometry environment they developed conceptual, interactive, and multi-representational schemes. The visual and interactive features of the dynamic environment facilitated pre-service teachers’ understanding of algebraic concepts and their transitions among representations. This indicates that technology integration should be adopted as an approach that supports conceptual learning in mathematics teaching.

Determination of the Nutritional Levels of Pine Nut Trees in the Kozak Plateau of Bergama, İzmir

Hajir Dawood Sulaiman JOBAN, Serra HEPAKSOY — Wed, 17 Dec 2025 00:00:00 +0300

The pine nut tree, an important species in terms of its fruit, is best suited to grow in the İzmir Bergama (Kozak plateau) and Aydın-Koçarlı regions of Turkey. The total area of pine nut trees in the Kozak region is approximately 6,000 hectares. In recent years, significant declines in seed production, accompanied by cone loss, have been observed in many regions of our country, particularly in the Kozak region. There may be various reasons for this decline in yield, one of which is thought to be the trees' nutritional deficiency. Therefore, the leaf nutrient content of pine nut trees in the village of Karaveliler, located in İzmir-Bergama, was examined. For this purpose, one, two and three year old needle samples were taken from trees in two different periods, in June when the one year old cones started to form and in November when the one year old cones were shed. In addition to differences between trees, differences in needle age and seasons were also examined. As the vegetation period progressed, increases in the concentrations of calcium and magnesium elements occurred in the needle leaves of pine trees, while decreases occurred in other macro and micro nutrient elements. Similarly, as needle age increased, decreases were observed in all nutrient elements except calcium and magnesium. At the end of the analyses, some differences were found among trees in terms of nutrient content. However, no significant deficiencies were detected in any nutrient.

A Research of The Effects of Some Agricultural Characters of Plant Density on Cowpea Grown as Double Crop in Şanlıurfa

Mustafa Cemil BÜYÜKKILIÇ, Habip ARTAN — Wed, 17 Dec 2025 00:00:00 +0300

This study was conducted in order to research of effects of plant density on some agricultural characters of cowpea, was sowed after wheat harvesting, in Şanlıurfa Experiment was made to randomized blocks with respect to experiment design as three replication at experiment field at the Field Crops Department of Agriculture Faculty of Harran University in 1994's summer season. Experiment was applied different row spacing and intra row that raw spacing was selected 70 cm and intra row selected 5, 10, 15 cm respectively. It was determined that the plant density effected significantly.

Investigation of the Effects of Waste Opal Mineral on Ceramic Glaze

Pınar BİÇİCİ ÇETİNKAYA, Hikmet Serdar MUTLU, Merve DİKİCİ — Wed, 17 Dec 2025 00:00:00 +0300

In this study, the effect of opal mineral obtained as Ordu-Ünye bentonite waste on ceramic glaze was investigated. Bentonite is used in the production of ceramic bodies and glazes due to its high water absorption and plasticity properties. The opal mineral produced as waste during bentonite production contains high amounts of silicon. As part of the research, waste opal mineral was added in increasing proportions to different glaze recipes designed for a temperature of 1050˚C. The results were evaluated in terms of surface, technical, and aesthetics. It was observed that opal mineral had positive effects on ceramic glazes, particularly as the flux ratio in the glaze recipes increased. When all these data were evaluated, it was observed that waste opal mineral imparts superior technical and aesthetic properties to ceramic glazes. This study aimed to contribute to reducing the environmental impact of waste opal mineral.

SVL (Sheath Voltage Limiter) – Contextual Evaluation of IEC 60099-4 Type Tests in Link-Box Applications

Murat GENÇAĞA — Wed, 17 Dec 2025 00:00:00 +0300

In high-voltage underground cable systems, the management of sheath voltages is of critical importance for system reliability and insulation coordination. This study provides a technical perspective to guide energy authorities by interpreting how the test requirements of Sheath Voltage Limiters (SVLs)—used within link boxes—should be understood in the context of their specific application, as defined in IEC 60099-4. Unlike conventional surge arresters that operate continuously under energized outdoor conditions, SVLs in link boxes are protection devices that function only during transient overvoltage events and are located in enclosed, protected environments. Therefore, certain type tests, such as environmental and mechanical endurance tests, are explicitly stated in IEC 60099-4 as not mandatory or may be exempted for link box applications. However, since SVL manufacturers generally design their products for both outdoor and enclosed system use, all type tests are typically performed during production. This practice has led to a common perception among energy authorities, utilities, and industry stakeholders that the same testing requirements apply to all SVLs, regardless of their installation environment. Consequently, some tests that are technically unnecessary for enclosed and protected applications are often considered obligatory. This paper emphasizes the importance of correctly interpreting and applying the exemption clauses in IEC 60099-4, taking into account the physical location, operating conditions, and housing design of SVLs within link boxes.