Gümüşhane ÜniversitesiGümüşhane ÜniversitesiAçık Erişim Arşivi · RDL Open

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  • MakaleAçık Erişim2026
    La2O3 addition's effect on sodium-barium borosilicate glasses' radiation shielding capability: WinXCOM and EGS4 Monte Carlo analysis

    Kaya, Selim

    This study thoroughly investigated the impact of La2O₃ inclusion on the radiation shielding effectiveness of sodium-barium borosilicate glasses using EGS4 Monte Carlo simulations and WinXCOM computations. The gamma-ray shielding behavior of a set of glass samples was systematically investigated over a wide photon energy interval ranging from 50 to 2506 keV. The glass compositions were modified through the stepwise substitution of Na₂O with La₂O₃. Key radiation interaction and shielding metrics—including the mass attenuation coefficient (μ/ρ), half-value layer (HVL), mean free path (MFP), radiation protection efficiency (RPE), effective atomic number (Zeff), and kerma coefficients—were determined and comparatively evaluated. The results demonstrate that the progressive incorporation of La₂O₃ leads to a marked enhancement in radiation shielding performance, particularly within the low-and intermediate-photon energy ranges where photoelectric interactions prevail. The inclusion of La₂O₃ results in increased material density, μ/ρ, Zeff, and kerma values, while simultaneously reducing (HVL) and MFP.In conclusion, sodium-barium borosilicate glasses treated with La₂O₃ have better radiation attenuation capacities than their La₂O₃-free counterparts. These results validate the effectiveness of La₂O₃ substitution as an approach for customizing borosilicate glass systems for applications that need improved radiation shielding.

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  • MakaleAçık Erişim2026
    Development of the seasonal non-monotonic Mann-Kendall test for hydroclimatic data

    Şan, Murat

    Climate change can show different characteristics at low and high values of a time series, leading to non-monotonic trends. The Mann-Kendall (MK) and seasonal MK tests can only detect monotonic trends and ignore different behaviors in low and high value groups. To overcome this limitation, extending the recently proposed non-monotonic MK (NMK) test, the seasonal NMK (SNMK) test is proposed. The method was applied to four stations in Türkiye with four different climatic and topographic characteristics using monthly total precipitation data for the 1969-2020 for seasonal trend behavior. The results showed that while no significant trends were detected in entire time series, intra-seasonal and annual data, both monotonic and non-monotonic significant trends emerged in seasonal analyses. Especially in two stations, opposite changes in low and high values, increased seasonal variance and non-monotonic seasonal trends were observed. The test can be used for regional trend analysis by replacing seasonal data with regional data. It is also predicted that the SNMK test can be used as an effective decision support tool in areas with high seasonality such as water resources management, agriculture, energy planning and disaster management.

    • SDG 13 · İklim Eylemi
    İncele
  • MakaleAçık Erişim2026
    Assessment of the effect of conventional and contemporary drying methods on the phenolic profile modulation and antioxidant retention of Trabzon persimmon (Diospyros kaki L.)

    Koçak, Tevfik; Demirel Ozbek, Yagmur; Saral, Ozlem; Kocyigit, Emine

    This study investigated the effects of conventional and modern drying methods on the total phenolic content, antioxidant activity, and phenolic compound composition of Trabzon persimmons (Diospyros kaki L.) fruits harvested from the same tree and at comparable maturity stages were subjected to sun drying, shade drying, oven drying, air-fryer drying, and microwave drying techniques, with raw samples serving as the control group. The total phenolic content was assessed via the Folin–Ciocalteu method, and the antioxidant capacity was evaluated using the ferric reducing antioxidant power (FRAP) and DPPH radical scavenging activity assays. The identification and quantification of phenolic compounds were conducted using the HPLC technique. The results indicated that the drying process produced statistically significant variations in the phenolic content and antioxidant capacity of Trabzon persimmons. The microwave drying technique resulted in highest total phenolic content and antioxidant activity, whereas both sun and shade drying procedures showed higher values than raw samples. The total phenolic content and antioxidant capacity of samples dried in an air fryer were found to be comparable to those of raw samples. The profile of phenolic compounds varied according to the drying process employed; certain compounds exhibited an increase with specific methods, while others were identified solely under particular conditions. Thus, it has been shown that drying techniques can have a significant impact on preserving and improving the functional properties of persimmons. Furthermore, we believe that microwave drying could be an effective alternative, particularly in terms of preserving bioactive compounds.

    • SDG 2 · Açlığa Son
    İncele
  • MakaleAçık Erişim2026
    Impact of cooking methods on PAH formation in traditional Akçaabat meatballs

    Bostan, Sinan; Gül, Abdulkadir; Karpuz, Ömer; Baltaci, Cemalettin; Yılmaz, Fırat

    Akçaabat meatballs, a traditional and commercially important Turkish meat product, are widely consumed and typically prepared using high-temperature cooking methods that may promote the formation of polycyclic aromatic hydrocarbons (PAHs). This study aimed to evaluate the effect of different cooking techniques, including pan cooking without added oil (dry pan cooking), electric grilling, oven baking, charcoal barbecue, and hazelnut shell charcoal barbecue, on PAH formation in Akçaabat meatballs. Samples obtained from eight different producers were analyzed for selected chemical properties and PAH contents using HPLC-FLD. While basic compositional characteristics varied among samples, the most significant differences were observed in PAH levels depending on the cooking method. The sum of four priority PAHs (∑PAH4) ranged between 7.70 and 112.38 µg/kg across all treatment s. Among the cooking methods, barbecue applications (charcoal and hazelnut shell charcoal) resulted in the highest PAH levels, frequently exceeding regulatory limits. In contrast, electric grilling produced the lowest PAH concentrations and showed the highest compliance with food safety standards. These findings demonstrate that cooking method plays a critical role in PAH formation and highlight the importance of selecting appropriate cooking techniques to minimize health risks. In this context, electric grilling can be considered a safer alternative, whereas traditional charcoal-based cooking methods may pose a significant risk in terms of PAH exposure.

    • SDG 2 · Açlığa Son
    • SDG 3 · Sağlık ve Kaliteli Yaşam
    İncele
  • MakaleAçık Erişim2026
    Seismic potential in and around the Muş basin (Eastern Türkiye): Insights from stress analysis and statistical modeling; [Muş havzası (Doğu Türkiye) ve civarındaki deprem potansiyeli: Gerilme analizi ve istatistiksel modellemeden elde edilen çıkarımlar]

    Şimşek, Ecenur Cansu; Alkan, Hamdi; Öztürk, Serkan

    In this research, current and near-future potential earthquake zones in and around Muş basin (eastern Türkiye) are investigated using the instrumental period earthquake catalog and focal mechanism parameters of local earthquakes. For this purpose, the relationships between the b-value distributions and the Colulomb stress changes are interpreted with different depth ranges (5 to 25 km). Also, for a reliable prediction, the occurrence probabilities, recurrence periods of earthquakes, and the Z-value distribution (seismic quiescence areas) are taken into consideration. 15,722 earthquakes with moment magnitudes with 0.8≤Mw≤6.9 between the latitudes of 38.2°N-39.6°N and longitudes of 40.0°E-43.0°E, over a period of ~90.63 years between November 12, 1934, and June 30, 2025, are used for all statistical analyses. Completeness magnitude, Mc-value is accepted as 2.5±0.5. The b-value is determined to be 0.780 ± 0.04, which is smaller than the average (b = 1.0). Additionally, twenty local events with magnitudes greater than Mw≥4.8 are selected to image the Coulomb stress changes. The occurrence probabilities of earthquakes with Mw=5.5, 6.5, and 6.9 in 10 years are predicted as ~83%, ~27% and ~15%, respectively. Recurrence periods of events with these magnitudes are estimated as ~13, ~32, and ~63 years, respectively. Large Z-values are detected in the Kargapazarı segment, Bingöl province, and west of the Kulp and Kozluk segments. Additionally, the analyses of b-value and Coulomb stress change used for hazard prediction reveal a decreasing b-value and an increasing stress change around the Karlıova Triple Junction at a depth of approximately 10 km. Finally, these seismotectonic parameters can represent the possible locations for earthquake occurrences in the near future.

    İncele
  • MakaleAçık Erişim2025
    Long-term mechanical and physical behavior of rural concrete roads: A case study from Trabzon; [Kırsal beton yolların uzun vadeli mekanik ve fiziksel davranışı: Trabzon’dan bir vaka çalışması]

    Seferoğlu, Mehmet Tevfik; Lermioğlu, Fatma

    This study evaluates the long-term mechanical and physical performance of rural concrete pavements-defined as two-lane, unreinforced jointed plain concrete pavements constructed with a C25 mix design, an average slab thickness of 18–20 cm, serving low-to-moderate traffic volumes (<500 vehicles/day, <10% heavy vehicles), and built directly over compacted granular subgrade-using cylindrical core samples extracted from five neighborhoods in Trabzon, Türkiye: Çal, Gökçeler, Derecik, Çiğdemli, and Yolgören. Laboratory tests included compressive strength, splitting tensile strength, elastic modulus, capillary water absorption, and abrasion resistance. Yolgören exhibited the most severe deterioration, with a 34.84% loss in compressive strength, the lowest tensile strength, and the highest abrasion loss (0.088%), primarily attributed to poor drainage and heavy traffic. Derecik showed 22.18% strength loss and the lowest elastic modulus (14.9×103 MPa), likely due to weak subgrade and freeze-thaw cycles. Çal displayed moderate strength but had the highest capillarity coefficient and significant stiffness reduction (elastic modulus: 15.7×103 MPa), indicating high porosity and freeze-thaw damage. Çiğdemli performed best in surface durability, with the lowest abrasion loss (0.026%) and satisfactory elastic modulus. Gökçeler presented a rare case of strength gain (+0.85%) and retained acceptable stiffness, though minor surface wear (abrasion loss: 0.038%) was observed. These findings demonstrate that mix design alone does not guarantee long-term durability in rural pavements. Site-specific factors-such as curing effectiveness, drainage planning, subgrade preparation, and climate-must be considered in pavement design. A context-sensitive, performance-based approach is recommended for the sustainable development of rural road infrastructure.

    • SDG 9 · Sanayi, Yenilikçilik ve Altyapı
    • SDG 11 · Sürdürülebilir Şehirler ve Topluluklar
    İncele
  • MakaleAçık Erişim2025
    September 25, 2024 Yumrukaya-Tatvan (Bitlis, Türkiye) earthquake and a seismo-tectonic evaluation of its impact on the earthquake hazard in the region; [25 Eylül 2024 Yumrukaya-Tatvan (Bitlis, Türkiye) depremi ve bölgedeki deprem tehlikesine etkisi üzerine sismo-tektonik bir değerlendirme]

    Öztürk, Serkan; Alkan, Hamdi

    The current and future earthquake hazard in and around Bitlis were tired to reveal by utilizing the September 25, 2024, Yumrukaya-Tatvan earthquake (Mw=4.5) and its aftershocks, b-value and Z-value distributions, occurrence probabilities and recurrence periods of earthquakes and variations in Coulomb stress within the scope of this study. Also, it was tried to determine which fault systems in the study area is related to the Yumrukaya-Tatvan mainshock, characterized by strike-slip faulting. b-value in G-R relation was computed as 0.84∓0.06 and small b-values (<1.0) were imaged in the north-northwest-southeast directions throughout the South East Anatolian Thrust Zone and Muş Fault Zone, and west of Lake Van. At the beginning of 2025, significant seismic quiescence was observed near the Muş Fault Zone and the south and southeast of the South East Anatolian Thrust Zone. Recurrence periods for the events with the magnitudes of Mw=5.0, 5.5 and 6.2 were computed as ~10, ~26 and ~100 years, respectively. Additionally, occurrence probabilities of earthquakes with these magnitudes in the intermediate-term (~10 years) were calculated as ~64%, ~32% and ~10%, respectively. Positive Coulomb stress changes carry out a movement from the Kavakbaşı Fault zone in the west and the Beğendik segment in the east toward the South East Anatolian Thrust Zone in the east-southeast. In this region, there is no active fault/fault system according to the General Directorate of Mineral Research and Exploration. Thus, these findings are significant clues showing that multiple parameter seismo-tectonic analyses are important in determining the earthquake hazard for the September 25, 2024 earthquake, and that regions with small b-values and seismic quiescence and regions with positive Coulomb stress changes may indicate current hazard and possible earthquake zones in the future.

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  • MakaleYayıncıda açık erişim2025
    A comparative analysis of microbial, chemical composition, and quality parameters in Kürtün-Araköy and Gümüşhane breads; [Kürtün-Araköy ve Gümüşhane ekmeklerinde mikrobiyal, kimyasal bileşim ve kalite parametrelerinin karşılaştırmalı analizi]

    Çimen, Büşra; Yilmaz, Fırat

    The objective of this study was to ascertain the distinguishing characteristics of Kürtün-Araköy bread and Gümüşhane bread, two local breads produced in Gümüşhane province in the Eastern Black Sea region. Furthermore, the bread dough samples employed in bread production were subjected to microbiological analyses. It was determined that the number of microorganisms in the sourdough samples used in the production of Gümüşhane bread was high (P<0.001). In this context, breads sold in the Gümüşhane province were collected and subjected to a series of analyses. These included chemical, microbiological, colour and HMF analyses of the bread samples. As a result of microbiological analyses performed on bread samples; It was observed that there were statistical differences in terms of lactic acid bacteria on MRS agar and yeast-mold counts. However, based on the chemical analyses performed on the bread samples, it was determined that there were statistically significant differences between the bread samples. The resulting data were then subjected to statistical analyses, with the objective of determining the differences between the bread samples. This was achieved through the use of PCA analysis, which also enabled the determination of the significance levels of these differences. In addition, the relationship between the colour values of the bread samples and the amount of HMF was also investigated in this study. The findings indicated that as the L* and b* colour values decreased, the HMF content of the bread samples increased. In this study, it was determined that Kürtün-Araköy and Gümüşhane breads have distinctive characteristics.

    • SDG 2 · Açlığa Son
    İncele
  • MakaleAçık Erişim2025
    Physicochemical, rheological properties, antioxidant activity and mineral amount of the ice cream containing barberry (Berberis vulgaris L.); [Karamuk (Berberis vulgaris L.) ilaveli dondurmanın fizikokimyasal, reolojik özellikleri, antioksidan aktivitesi ve mineral içeriği]

    Ürkek, Bayram

    Ice cream is classified as a dairy product or frozen dessert. Various fruits have been incorporated into ice cream formulations to enhance their quality and nutritional properties. In this study, ice creams were prepared with barberry at four different concentrations (0%, 5%, 10% and 15%). The physicochemical, rheological characteristics, antioxidant activity, mineral content and sensory properties of the samples were examined. With the addition of barberry, the dry matter (DM), acidity and overrun values increased, while pH and fat content decreased. The viscosity and consistency coefficients were highest in the samples containing 10% and 15% barberry. All samples exhibited pseudoplastic flow behavior. The colorimetric parameters showed significant differences among the samples, except for the C* value. The sample with 5% barberry had higher levels of Ca, Na, Mg, S, Fe and Zn compared to the other barberry-added samples. The sample containing 15% barberry demonstrated the highest DPPH scavenging activity (22.15 μg/mL) and total phenolic content (TPC) (1474.04 mg GAE/g), while the sample without barberry had the lowest values (143.19 μg/mL and 149.48 mg GAE/g, respectively). Additionally, the control sample received the lowest scores for gumming structure, texture, melting in the mouth, resistance to melting and overall acceptability. These findings suggest that incorporating 10% barberry could enhance the quality and nutritional value of ice creams.

    • SDG 2 · Açlığa Son
    İncele
  • MakaleAçık Erişim2025
    In-depth review of industry 4.0: research implications and future perspectives; [Endüstri 4.0'ın derinlemesine incelemesi: araştırma sonuçları ve gelecek perspektifleri]

    Gurcan, Fatih; Cam, Handan; Ahmed, Sana

    The term “Industry 4.0” signifies a pivotal stage in industrial development, representing the current wave of transformation characterized by the integration of digital technologies into manufacturing and business processes. This concept spans multiple disciplines, including industrial engineering, data science, marketing, and strategic management. While a considerable volume of research has been conducted under the umbrella of Industry 4.0, there remains a lack of a comprehensive synthesis that captures the full scope and evolution of the field. The objective of this study is to systematically analyze, classify, and evaluate published research related to Industry 4.0, while identifying key gaps and forecasting potential future research directions. To accomplish this, a total of 10,696 journal articles indexed in the SCOPUS database from 2013 to 2023 were analyzed. The Latent Dirichlet Allocation (LDA) algorithm—a widely used probabilistic topic modeling technique in text mining—was applied to uncover latent themes within the literature. The analysis revealed 41 major topics, which were subsequently organized into five overarching categories: Sustainability, Manufacturing, Technology, Process, and Management. Findings indicate a notable shift in research emphasis over the past decade—from predominantly technical and engineering-focused issues toward broader concerns involving process optimization and organizational management. This transition highlights the growing importance of interdisciplinary approaches in addressing the complex challenges posed by Industry 4.0. Ultimately, this study not only maps the intellectual structure of existing research but also serves as a valuable resource for scholars, helping to navigate emerging trends and target underexplored areas in future investigations. This comprehensive thematic overview supports academics in pinpointing neglected subject areas, aligning future investigations with emerging priorities, and refining the strategic focus of Industry 4.0 research agendas.

    • SDG 9 · Sanayi, Yenilikçilik ve Altyapı
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  • MakaleAçık Erişim2025
    The analysis of Caputo-Fabrizio fractional plastic waste model with a new numerical method; [Caputo-Fabrizio kesirli mertebeden plastik atık modelinin yeni bir sayısal yöntemle analizi]

    Bingöl, Sait; Anaç, Halil

    In this paper, the new numerical solutions for Caputo-Fabrizio fractional plastic waste model are derived utilizing a novel hybrid approach known as the Caputo-Fabrizio fractional q-formable homotopy analysis transform method. A novel hybrid method combining the Caputo-Fabrizio transform and the q-homotopy analysis method is introduced. A plastic waste model generally denotes a conceptual or mathematical framework employed to comprehend, simulate, or forecast the movement, accumulation, and effects of plastic trash within a system, spanning from local surroundings to the global scale. The plastic waste model is analyzed in the Caputo-Fabrizio fractional framework. The solutions for the Caputo-Fabrizio fractional plastic waste model are illustrated in the Maple program.

    • SDG 12 · Sorumlu Üretim ve Tüketim
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  • MakaleAçık Erişim2025
    A deep learning approach powered by GhostNet for skin cancer classification; [GhostNet tabanlı derin öğrenme yaklaşımı ile cilt kanseri sınıflandırması]

    Almasani, Heba; Ture, Hayati

    Skin cancer, especially melanoma, continues to cause a disproportionate percentage of cancer-related deaths despite its high curability when detected early. This work presents an efficient deep-learning system aimed at the binary classification of dermoscopic images as malignant or benign using the GhostNet family of convolutional neural networks (CNNs). The publicly available ISIC-2019 dataset was used for training its extreme class imbalance was corrected using a hybrid Synthetic Minority Over-sampling Technique coupled with Edited Nearest Neighbours (SMOTE-ENN). End-to-end fine-tuning of three variants of GhostNet (V1, V2, V3) was performed with preprocessing, augmentation, and hyper-parameters kept constant to ensure a fair model-to-model comparison. Evaluation metrics used were accuracy, precision, recall, F1-score, and the area under the receiver-operating-characteristic curve (AUC). GhostNet V2, augmented with depth-wise attention, gave the strongest results: 95% accuracy, 94% malignant class recall, F1-score of 94.3%, and an AUC of 0.99. GhostNetV2 performed better than both the baseline V1 and V3 without having a parameter count that would prevent real-time inference on mobile hardware. These results of Accuracy, sensitivity, F1-score, AUC and recall show that, when combined with targeted imbalance correction, efficient architectures such as GhostNet are capable of dermatologist-level sensitivity without the computational requirements of heavier models, and thus are feasible for point-of-care or resource-constrained settings. It is complementary to our previous work with other CNNs, allowing model-to-model comparison directly.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
    İncele
  • MakaleAçık Erişim2024
    Determination of physicochemical and antioxidant properties of icecream produced with the addition of Jerusalem artichoke (Helianthus tuberosus L.); [Yer elması (Helianthus tuberosus L.) ilavesiyle üretilen dondurmanın fizikokimyasal ve antioksidan özelliklerinin belirlenmesi]

    Gündoğdu, Engin

    The study investigates the effects of incorporating Jerusalem artichoke (Helianthus tuberosus L.) into ice cream formulations on their physicochemical and antioxidant properties of icecream. Jerusalem artichoke (JA), known for its high inulin content and beneficial carbohydrates, was added to ice cream in varying concentrations (5%, 10%, and 15%) and evaluated for its impact on dry matter, protein, ash, pH, acidity, sugar content, viscosity, volume increase, initial dripping time, total melting time, color values, total phenolic content, DPPH free radical scavenging activity, and total antioxidant capacity.The results revealed that the addition of JA significantly improved the dry matter and antioxidant properties of the ice cream, with the highest values observed in samples containing 10% and 15% JA. Total phenolic content increased from 363.51 mg GAE/kg in the control to 587.47 mg GAE/kg with 15% JA, while DPPH scavenging activity rose from 12.49% to 18.04%. On the other hand, the control sample has the highest total antioxidant capacity (4517.29 mg AAE/kg), while the JA samples generally exhibit lower values. The protein content decreased slightly with the addition of JA, while ash content increased. The pH and titratable acidity values also showed significant changes, with higher concentrations of JA resulting in higher pH and acidity. Overall, the incorporation of JA into ice cream formulations enhances the nutritional and functional properties. These findings suggest that JA is a valuable ingredient for developing functional ice cream with potential health benefits.

    • SDG 2 · Açlığa Son
    İncele
  • MakaleAçık Erişim2024
    Investigation of aroma components obtained by HS-SPME (Headspace-solid phase microextraction) method of wild strawberry (Fragaria vesca L.) and strawberry (Fragaria x ananassa Duch.) fruits; [Dağ çileği (Fragaria vesca L.) ve çilek (Fragaria x ananassa Duch.) meyvelerinin HS-SPME (Tepe boşluğu katı faz mikro ekstraksiyonu) yöntemi ile elde edilen aroma bileşenlerin araştırılması]

    Öz, Mehmet; Baltaci, Cemalettin; Fidan, Muhammed Said

    Wild strawberries (Fragaria vesca) are in the category of non-wood forest products due to their unique fragrance, aroma, and natural ability to grow. In this study, aroma components of wild strawberry (Fragaria vesca) and strawberry (Fragaria x ananassa) fruits were determined by Headspace-Solid Phase Micro-Extraction technique combined with Gas Chromatography-Mass Spectrometry (HS-SPME/GC-MS). In addition, it aimed to compare the results of both fruits with each other by chemical classification of the aroma components determined from wild strawberry and strawberry fruits. As a result of the HS-SPME/GC-MS analysis; 50 and 76 aroma components were determined in wild strawberry and strawberry fruits, respectively. The structure of aroma components was defined as 97.63% of wild strawberries and 98.26% of strawberries. The main components in the aroma compounds are 2-undecanone (10.38%), γ-decalactone (8.81%), and eugenol (7.14%) in wild strawberry fruit; nerolidol (29.44%), γ-decalactone (26.36%) and bisabolol oxide II (4.23%) were found in strawberry fruits. In addition, chemical classes of identified aroma compounds were determined as ester, terpene or terpenoid, fatty acids, aldehyde, and ketone classes in Fragaria vesca and Fragaria x ananassa fruits. When the results are examined, it is seen that strawberry fruits are found to be higher than wild strawberry fruits in terms of percentage of aroma components, number of aroma components, and percentage of dominant components.

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  • MakaleAçık Erişim2023
    Detection of buried objects with different material properties by ground penetrating radar (GPR) method; [Farklı malzeme özelliklerine sahip gömülü nesnelerin yer radarı (GPR) yöntemiyle tespit edilmesi]

    Sari, Mahmut

    GPR which permits the capture of high-resolution subterranean data, has developed into a key geophysical technique for determining the depth, geometry, boundaries, and volumes of buried shallow objects. In this study, the detectability of the location, size, and physical property parameters of buried objects with the ground radar method was reveal ed by creating a laboratory environment in real field conditions. For this purpose, a realistic laboratory environment with a depth and length of 5 m was created on the filled soil material at the test site, and buried objects with different material properties were placed. In addition, by adding sand material to the middle part of the soil fill material in the test area, its situation in different layers was tried to be examined. GPR data were collected on the models using the RAMAC CU II system and a 500 MHz center frequency shield antenna. After processing the data, reflected/scattered electromagnetic (EM) wave fields on the radargram of a profile perpendicular to the buried objects were examined. In this way, the positions, sizes, physical properties (types) of buried objects along with their depths and their situations in different layer environments have been revealed. According to the results, the peak width of hyperbolas and the sizes of buried objects were determined on the processed radargrams. The types of buried objects and their situations in different layer environments are clearly revealed. The scattered wave field amplitudes of the plastic pipe (A and C regions) from the reflection coefficients are substantially lower than the scattered wave field amplitudes of the iron pipe (B region) from the buried objects. It is thought that the strong reflections extending from the C region to the deep on the radar are caused by the lead blocks in the plastic pipe.

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  • MakaleAçık Erişim2023
    Investigation of changes in geomechanical properties of sandstones under different saturation and anisotropy conditions: Example from Gümüşhane (NE Türkiye); [Farklı doygunluk ve anizotropi koşullarında kumtaşlarının jeomekanik özelliklerindeki değişimlerin incelenmesi: Gümüşhane örneği (KD Türkiye)]

    Gültekin, Zarife; Dağ, Serhat

    gIn this study the changes in various geomechanical properties were studied for sandstones cropped out at the Mescitli region of the Gümüşhane city under different saturation and anisotropy conditions. For this purpose, 225 specimens were prepared considering the lamination planes of those were chosen to have orientation of 0, 30, 45, 60 and 90° relative to loading direction. Index properties of the sandstones such as dry unit weight (dryg), saturated unit weight (sat), water absorption by weight (Aw) and water absorption by volume (Av) were assigned. In accordance with the objective of study P wave velocity, uniaxial compressive strength and indirect tensile strength values were determined based on different saturation and anisotropy conditions. It was noted as a result of the observations carried out that specimens parallel to lamination have higher wave velocities in general when compared with specimens that are perpendicular to lamination planes. While uniaxial compressive strength values for sandstones are high for specimens which are parallel and perpendicular to lamination, the lowest strength value was observed in specimens with an anisotropy angle of 30°. In addition, it was also observed that the strength values decrease at a significant level with increasing saturation conditions. Strength anisotropy ratio (RUCS) for sandstones varies between 1.28–1.49 based on different saturation conditions. Similarly, while indirect tensile strength values were higher in specimens that were parallel and perpendicular to lamination, they were lower for other anisotropy orientations. Indirect tensile strength values also decreased with increasing degree of saturation.

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  • MakaleAçık Erişim2023
    Assessment of photovoltaic module temperature estimation for four years with four different software; [Dört yıllık fotovoltaik modül sıcaklık tahmininin dört farklı yazılımla değerlendirilmesi]

    Tolgay, Doga; Yakut, Muhammet Samet; Ozden, Talat; Akinoglu, Bulent G.

    The software used today, on the estimation of module temperature of photovoltaic systems, seem very important to be analyzed. These estimates are crucial in future techno-economic and environmentally friendly analyses of the systems to reach better achievements for future generations. This is very important to reach lifetime analyses of long-term feasibility to find out payback time and the levelized cost of energy. The present work is based on this issue, to test the module temperature estimation formulas used by four commonly used software models, and to determine the most suitable software for temperature analyses of five different photovoltaic modules in Middle Anatolia. Outdoor truthful long-term testing is the main realistic approach to reach fundamental contemplations. After an introductory basic knowledge, the main materials and methods are discussed to enlighten the analysis. The main methodology is given and further prospects are enlightened. Four well-known software are analyzed using four years of outdoor testing of five different photovoltaic modules. Measured ambient temperature and solar irradiance are used in the categorization of the software estimation performances. PV*SOL appears to be superior at low irradiance and ambient temperature, whereas Helioscope appears to be superior overall.

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  • MakaleAçık Erişim2023
    Investigation of the structural damage caused by blasting activities in tunnels to surrounding buildings: The case of Gümüşhane belt highway; [Tünellerde patlatma faaliyetlerinin çevre binalara verdiği yapısal hasarın incelenmesi: Gümüşhane çevre yolu örneği]

    Seferoğlu, Mehmet Tevfik; Seferoğlu, Ayşegül Güneş; Akaryali, Enver

    Tunnels are road transport structures that reduce traffic and expropriation problems, noise, and possible damage to animals and plants, and provide safer, more comfortable, and faster transportation for vehicles compared to highways. However, some environmental problems occur during tunnel construction. These problems such as vibration, noise, rock throwing, etc. caused by the blasting process used during tunnel excavation on buildings and people should be well investigated. In this study, two buildings located close to the exit and entrance of two tunnels (T2 and T3 tunnels) on the Gümüşhane belt road were chosen to investigate. Firstly, the existing damages in the first building, which is 7 m away from the T2 tunnel exit, and the second building, which is 60 m away from the T3 tunnel entrance, were analyzed by considering criteria such as the geological and ground condition of the land and the building materials used during the construction of those building. In addition, the negative effects on the buildings were evaluated by calculating the vibrations after the blasting process in the tunnel with the help of various empirical formulas. Investigation on site showed that building 1 was built of masonry and building 2 was built of reinforced concrete, and that deep cracks had formed in the bearing systems of both buildings, spills occurred in the walls, and fractures in the windows. Also, calculations with empirical formulas showed that the vibration rates caused by blasting process in the 1st and 2nd buildings were as 385.68 mm/sec and 6.91 mm/sec, respectively, and these vibration values were above the standard values. The data obtained through examination on-site and empirical approaches show that it would be dangerous for people to be resident in both buildings.

    • SDG 9 · Sanayi, Yenilikçilik ve Altyapı
    • SDG 11 · Sürdürülebilir Şehirler ve Topluluklar
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  • MakaleAçık Erişim2023
    Shear strength estimations and shear designs on RC beams with limited ductility by FL and FIL methods; [BM ve BTM yöntemleri ile sınırlı sünekliğe sahip betonarme kirişlerde kesme dayanımı tahmini ve kesme tasarımı]

    Öztekin, Ertekin

    In this study, a fuzzy logic model was constituted by using the Fuzzy Logic (FL) method, which is one of the traditional artificial intelligence (AI) methods, in order to estimate the shear strength of reinforced concrete (RC) beams with limited ductility. In this model, beam width(bw), beam height(h), characteristic concrete compressive strength(fck), transverse reinforcement diameter(ØT), the number of arms bearing the shear force of the transverse reinforcement(n) and transverse reinforcement spacing(s) were taken into account as variable parameters. The model developed by using the problem data containing the solutions of shear force strength of 2640 beams with different cross-section properties were tested with 480 beam solutions different from these data. In the tests of the developed FL model, maximum percentage error, minimum percentage error, average percentage error and correlation coefficient values were obtained as 3.604,-0.091, 1.514 and R2=0.999678. By applying the fuzzy inverse logic method (FIL), which was recently developed by the author of this study, on the FL model, which is seen to have been developed quite sensitively from the test results, a total of 521 designs were obtained for 15 different RC beams with limited ductility subjected to shear. In order to check the accuracy of these designs, after shear strengths were obtained by conventional computations for these designs, % error and correlation coefficients were computed between the obtained strength values and the shear force values taken into account for the design. The promising results show that the FIL method can be used in the design of RC beams under shear force and even in other scientific studies such as design, optimization and control.

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  • MakaleAçık Erişim2023
    First report of qnr and blaVIM-4-like producing clinical Alcaligenes faecalis isolated in Türkiye; [Türkiye'den izole edilen qnr ve blaVIM-4-like üreten klinik Alcaligenes faecalis’in ilk raporu]

    Akyildiz, Esma; Saral Sariyer, Ayşegül; Köse, Tuba; Arslan, Mikail; Beriş, Fatih Şaban; Özad Düzgün, Azer

    The study set out to look at the clinical strain of A. faecalis's antibiotic susceptibility pattern. Both biochemical and molecular approaches were used to identify A.faecalis. The VITEK compact system was used to analyze the strain's antibiotic susceptibility profile. The use of PCR was evaluated to determine the presence of resistance genes. It was also determined whether resistance determinants could be transferred. It was determined that A. feacalis showed resistance to imipenem, cefepime, ceftazidime, gentamicin, amikacin, netilmicin, tobramicin, ciprofloxacin, and levofloxacin. The blaVIM-4-like gene was present in this strain, according to the results of the PCR and DNA sequencing studies. In contrast to VIM-4, this blaVIM-4-like gene showed one amino acid change (Ala265Val).Filter-mating experiments showed that the blaVIM-4-like gene cannot be transferred from A. faecalis to E. coli. In this study, This research, demonstrated the presence of the blaVIM-4-like gene for the first time in A. faecalis from Turkey.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
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