Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu Kurumsal Araştırma Arşivi

Kurum yayınları ve kurum çalışanlarının yayınları “Açık Erişim” kapsamında yayınlanmaktadır. Açık Erişim “evrensel nitelikteki bilimsel bilginin insanlığın yararına sunulması” amacını taşır. Tezler, konferans bildirileri ve sunumlar ile makaleler kurum çalışanları tarafından sisteme girilmektedir.Tezler için; YÖK'ten alınan görüş doğrultusunda tez sahibinin izin vermesi yeterlidir. Konferans bildirileri ve sunumların yayına gönderildiği son hali arşive konulabilir.Makaleler için ise; hakem onayından geçmiş, yayına gönderildiği son halinin (post-print) Açık Erişime sunulmasına yayıncılar %90 oranında izin vermektedir. Arşivde şu an 1.639 yayın bulunmaktadır, çalışma bitiminde bu sayı yaklaşık 2.000 yayın sayısına ulaşacaktır.

 

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Irrigation Cycle Optimization and Water Management in Stevia Production in Vertical Hydroponic Systems
(Turkish Science and Technology Publishing (TURSTEP), 2026-05-19) Çetintaş, Aydın Ozan; Apaydın, Halit; Kunter, Burak; Turan, Özlem; Çakın, Irmak; Kantoğlu, Kadriye Yaprak
Vertical hydroponic systems are becoming a key component of sustainable agriculture by enabling year-round production in limited space and closed-loop water management. In this study, the effects of irrigation cycling on the growth, biomass, biochemical quality, and water use efficiency of Stevia rebaudiana Bertoni in vertical hydroponic systems were investigated. The experiment was conducted under four irrigation cycle conditions—each defined by a different off-time per tower (H1: 150 s, H2: 300 s, H3: 450 s, H4: 600 s) with a fixed 15-second on-time—in four independent towers each with 21 planting slots. Seedlings obtained from the same individual were distributed in a balanced short-to-long arrangement to standardize initial conditions. The 300-second off-time group (H2) achieved the highest values in dry biomass (1.90 ± 1.04 g/plant), total phenolic content (7.14 ± 0.34 mg gallic acid equivalents/g), DPPH antioxidant activity (5.90 ± 0.15 mmol Trolox equivalent/g), and yield-based water use efficiency (3.17 g/L). The group with the longest off-time (H4: 600 s) reduced water consumption but fell notably behind in biomass and quality parameters. Stem length on day 30 showed a strong Spearman correlation with dry weight (ρ = 0.873, p < 0.001), suggesting that non-destructive dimensional measurements can serve as practical biomass predictors. The findings demonstrate that a 300-second off-time simultaneously optimizes growth, biochemical quality, and water efficiency in vertical hydroponic Stevia production, and indicate that irrigation cycle design should consider product quality and biomass yield integrity alongside water savings.
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Multilayer ZTA-core composite with bio-derived coatings for space radiation shielding against gamma, proton, and neutron radiation
(ELSEVIER, 2026-05-27) Yıldırım, Aydın; Opçin, Büşra
This study numerically evaluates the radiation shielding performance of a multilayer ceramic architecture consisting of a zirconia toughened alumina core with mycelium-based coatings, including melanized variants, under gamma rays, neutrons, and protons. Photon attenuation is simulated using Geant4 and benchmarked against XCOM, and standard gamma shielding metrics are reported for the multilayer configuration. Neutron response is quantified through macroscopic removal cross sections in the 2 to 10 MeV range and thick-ness dependent transmission factors for fast and thermal neutrons, where clearer separation among coatingoptionsisobservedinthethermalregion. Proton stopping power and depth dependent LETprofilesareobtainedwithSRIM/TRIMfor10to50MeV,andtheBraggpeakpositionisusedtoassesslayerthicknessrequirements.Thecompositesystemshowsphotonattenuationbetweenconcreteandlead,whileneutronperformancedependsstronglyoncoatingcomposition.Overall,theresultsestablishadirectlinkbetweenarchi-tecturalparametersandradiationresponse,providingguidanceforthedesignandoptimizationoflayeredceramicshieldingsystems.
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Multilayer ZTA-core composite with bio-derived coatings for space radiation shielding against gamma, proton, and neutron radiation
(ELSEVIER, 2026-05-27) Yıldırım, Aydın
This study numerically evaluates the radiation shielding performance of a multilayer ceramic architecture consisting of a zirconia toughened alumina core with mycelium-based coatings, including melanized variants, under gamma rays, neutrons, and protons. Photon attenuation is simulated using Geant4 and benchmarked against XCOM, and standard gamma shielding metrics are reported for the multilayer configuration. Neutron response is quantified through macroscopic removal cross sections in the 2 to 10 MeV range and thick-ness dependent transmission factors for fast and thermal neutrons, where clearer separation among coatingoptionsisobservedinthethermalregion.ProtonstoppingpoweranddepthdependentLETprofilesareobtainedwithSRIM/TRIMfor10to50MeV,andtheBraggpeakpositionisusedtoassesslayerthicknessrequirements.Thecompositesystemshowsphotonattenuationbetweenconcreteandlead,whileneutronperformancedependsstronglyoncoatingcomposition.Overall,theresultsestablishadirectlinkbetweenarchi-tecturalparametersandradiationresponse,providingguidanceforthedesignandoptimizationoflayeredceramicshieldingsystems
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CONCEPTUAL EVALUATIONS FOR LOW-ENERGY ELECTRON BEAM (LEEB) AND COMPARISON WITH GAMMA IRRADIATION OF CITRUS FRUITS
(IAEA International Atomic Enerji Agency, 2024-05-31) TURAN, Özlem
The assessment and management of risk must satisfy the requirements set forth by importing nations in order for the Turkish agriculture sector to develop linearly. It must also guarantee that trade-related biosecurity risks are appropriately managed. In terms of agricultural exports, citrus fruits account for a significant portion of Türkiye's exports. On the other hand, conventional approaches are utilized to battle the Mediterranean fruit fly agent in addition to microbiological losses in the export of these products. It is widely accepted that fruits can have their risk factors minimized through the application of irradiation. Low-energy electron beam (LEEB) applications for fresh fruit phytosanitary purposes have gained significance recently. After conducting studies, it has emerged that using LEEB for the eradication of microorganisms on or near food surfaces or for phytosanitary purposes is both a sustainable and effective option in the food industry. This study provides a review of LEEB and gamma irradiation applications on citrus group fruits based on previous research. Additionally, a comparison will be conducted between both methods in terms of phytosanitary procedures, microbiological decontamination, and food quality. Also, conceptual and practical recommendations for potential LEEB technique use in the future were discussed.
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Experimental and theoretical assessment of selected pollutants treated with gamma radiation and hydrogen peroxide
(ELSEVIER, 2024-12-15) Genç, Ayşenur; Ergun, Ece; Fitoz, Alper; Kantoğlu, Ömer; İnce, Mahir; Acar, Orhan
Degradation of ibuprofen, triclosan, diclofenac, and ketoprofen in real wastewater effluent by gamma radiation/ hydrogen peroxide was investigated on the basis of removal efficiencies, G-values, and kinetics. Gamma irradiation was performed using a60Co source irradiator in the presence of different concentrations of hydrogen peroxide. The analyses of the pollutants were performed before and after irradiation treatment using a Liquid Chromatography-Mass Spectrometry (LC-MS) system. The addition of 0.5% hydrogen peroxide resulted in an enhanced removal efficiency of the target pollutants (93.92% for ibuprofen, 99.47% for triclosan, 86.65% for diclofenac, and 86.32% for ketoprofen) compared with the performance of the gamma irradiation process alone. The rate constants (k) of ibuprofen, triclosan, diclofenac, and ketoprofen increased by 1.42, 2.38, 1.38, and 3.37 times with 0.5% hydrogen peroxide addition, respectively. Moreover, the 90% decomposition of the target pollutants was achieved at lower doses in the gamma-ray/hydrogen peroxide system in comparison with the gamma treatment without hydrogen peroxide. Fukui functions and dual descriptor were calculated using density functional theory (DFT) to investigate the sensitivity of the target pollutants to hydroxyl radical attacks, to identify the initial reaction pathway, and to predict the degradation by-products. The findings were consistent with literature mechanisms and observed by-products.
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