Makale 2020-2029 yılları

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Achieving superior strength and ductility in oxide dispersion strengthened IN625 alloy produced by laser powder bed fusion
(ELSEVIER, 2024-12-19) Demirci, Kadir Tuğrul; Özalp, Ali; Güner Gürbüz, Selen Nimet; Bükülmez, İlhan; Aksu, Erhan; Aydoğan, Eda
In this study, a new grade of oxide dispersion strengthened (ODS) Inconel 625 (IN625) alloy having the composition of 0.3 wt% Y2O3 – 0.4 wt% Hf – IN625 has been developed and produced by laser powder bed fusion (L-PBF). Production parameters have been determined for standard and ODS IN625 alloys to yield >99.9% densification. Microstructural analyses reveal similar texture along <001> while a larger but homogenous strain distribution exist in ODS IN625. Nano-particles are determined to be mostly Y-Hf-O and Y2O3 with an average size of ~30 ± 18 nm and 2.2 ± 1.1x1013 m-2 areal fraction. Tensile tests at room temperature (RT) and 700 °C demonstrate superior mechanical properties of ODS-IN625, particularly at elevated temperatures. While the yield strengths of standard and ODS IN625 alloys are similar (~680 MPa), ductility of ODS IN625 is slightly larger at RT. However, the yield strength of ODS-IN625 increased by 7.4%, reaching ~580 MPa, compared to the standard IN625, which has a yield strength of ~540 MPa at 700 °C. More notably, the ductility of ODS IN625 shows a remarkable improvement, increasing from ~12% in the standard IN625 to ~22%, representing an increase of more than 80%. Detailed microstructural analyses on the fracture surfaces of the ODS IN625 alloys exhibit submicron dimples, as well as an extensive amount of dislocation loops, Lomer-Cortrel (L-C) locks, and stacking fault tetrahedra. Nano-oxides were determined to be responsible for the dislocation wall structure and dislocation distribution which in turn improves the mechanical properties. This study sheds light on tailoring the strength-ductility balance in IN625 alloys by introducing the nano-oxide particles and perceiving the mechanism of this improvement.
Assesment of Cyclotron Produced 64Cu Radionuclide with Monte Carlo Simulations
(Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu (TENMAK), 2024-05-15) Yıldırım, Aydın; Boztosun, İsmail
Physical yields and activities of theranostic radioisotope 64Cu were calculated via Monte Carlo simulations. Geant4 simulation toolkit is employed for the Monte Carlo calculations. The study is based on proton irradiation of solid targets at cyclotron facilities. Two types of target material were investigated: Nickel and Zinc. Also, two different target thickness and two beam angles were assessed in order to see the change of yields and activities. The optimum results were achieved at 150 μm thickness, 24 MeV beam energy and 5◦ beam angle for the nickel target, and 150 μm thickness, 30 MeV beam energy and 5◦ beam angle for the zinc target.
Average glandular doses and national diagnostic reference levels in mammography examinations in Turkey
(Oxford University Press, 2020-05) Parmaksız, Aydın; Ataç, G. K.; Bulur, Emine; İnal, Tolga; Alhan, Aslıhan; AAH-5187-2020; 0000-0003-4000-5175; TAEK-Radyasyon ve Hızlandırıcı Teknolojileri Dairesi Başkanlığı
In order to establish National Diagnostic Reference Levels (DRLs) for mammography examinations, Entrance Skin Air Kerma (ESAK), Entrance Skin Dose (ESD) and Average Glandular Doses (AGDs) were calculated for a total of 25624 cranio-caudal (CC) and mediolateral oblique (MLO) projections of 6309 patients for 40-49 and 50-64 age groups. The average ESAK and ESD values for both age groups were found to be higher in MLO projections compared to CC projections. The minimum and maximum values of AGDs were determined as 0.4 mGy and 7.9 mGy for both projections. The maximum numbers of AGDs for CC and MLO projections were calculated in the range of 1.1-1.5 mGy and 1.6-2.0 mGy respectively. The third quartile values of AGDs were calculated for each compressed breast thickness (CBT) between 20 mm and 99 mm. The first National DRLs of the country were established for each 10 mm CBT in mammography examinations.
Beneficiation of Eskişehir Beylikova Bastnasite Ore and Rare Earth Elements Recovery
(Scopus, 2023-11-14) Türker, Gülşah; Koç Delice, Tülay; Temizkalb, Arda; Özgür, Özgün Cem; Soydaş Sözer, Belma
Unique magnetic, optical and electrical properties of rare earth elements (REEs) have be come essential in modern high technology. Considering this necessity of technology, efficient man agement and utilization of rare earth resources is of great importance. Even though there are more than 250 rare earth minerals in around the world, the number of minerals that can be economically processed, not exceeding three. Among these minerals, bastnaesite, has a significant impact on sci entific advancement and social progress. This project aims to contribute to the establishment of a sustainable supply chain for REE in Turkey and Europe by conducting research and development activities to leverage the utilization of REEs found in our country. The primary objective of this project is to extract rare earth oxides from complex ore in the Eskişehir Beylikova region, which holds the largest reserve potential discovered in our country, and to refine these metal oxides to produce metals that can be used in magnet manufacturing. The project encom passes five main work packages during three years: Project management, ore enrichment, solvent extraction based purification, utilization of REOs and metals in additive material and magnet pro duction.
Bitkilerde mutagen uygulamaları ile genetik çeşitliliğin artırılması ve sebze ıslahında kullanımı
(Gece Kitaplığı, 2021-12-25) Kökpınar, Şule; Kantoğlu, K. Yaprak; Ellialtıoğlu, Şeküre Şebnem; https://orcid.org/ 0000-0002-7247-9116; TENMAK-Nükleer Enerji Araştırma Enstitüsü-Ankara
Boron Salicylate Ester Compounds as Boron Therapeutics. Their Synthesis, Structural Characterizations and Anticancer Effects Against MDA-MB-231
(SPRINGER NATURE, 2024-10-03) Bolat, Melda; Köse, Dursun Ali; Akbaba, Sema
The element boron forms a wide range of borate minerals with different properties. Borate minerals make it possible to design boron-containing molecules with new biological properties in terms of their chemical structure and properties. It is known that boron compounds have antioxidant, anti-inflammatory, anti-tumor and anti-cancer properties. This makes boron compounds important for the future development of boron chemotherapeutics, boron supplements and new drugs. Reliable scientific studies on boron compounds will facilitate the clear presentation of their functions in its biological applications and metabolism. In this study, boron monoester and boron diester structures were synthesized with salicylic acid ligand. To stabilize boron ester structures, Na+, K+, Mg2+, Ca2+ cations were used as counter-ions. Structural properties of the synthesized substances, molecules obtained by crystallization/precipitation from aqueous solutions in solid state, elemental analysis, melting point determination, infrared spectroscopy analysis (FT-IR), thermal analysis (TGA/DTA), mass analysis (GC-MS) and single crystal analysis. Structural properties were tried to be explained by structure analysis (SC-XRD) methods. Additionally, the anticancer potential of boron salicylate esters against the MDA-MB-231 human breast adenocarcinoma cell line was examined. The K-B salicylate diester molecule was found to have the most potential potency with the lowest IC50 value against the MDA-MB-231 cell line. The anticancer potential of boron salicylate esters can be further investigated with other cancer models with the combination of anticancer drugs. It is also thought that the mechanism of action of these molecules may help reveal their further applications.
Callus and suspension culture techniques optimized for use in carrot breeding studies (Daucus carota ssp. sativus var. atrorubens alef and D. carota)
(TAGEM, 2023-02-02) Büyükdinç Turan, Damla; Kantoğlu Kadriye Yaprak; Karataş, Arzu; Ellialtıoğlu, Şebnem
In this study, studies were conducted to optimize callus and suspension culture methods for in vitro mutation breeding in purple and orange carrots. Following this, the developed mutant lines were subjected to in vitro salt stress selection. The study determined the optimal agar dose. The first germination, 50% germination, rootcotyledon formation and genuine leaf formation in carrot seedlings were analyzed daily in the study, which was continued with the determined 7g/L agar dose. The cotyledon and hypocotyl explants from the seedlings were cultivated for callus production in mixtures of MS-1, MS-2 and MS-3 nutritional medium. In the second and fourth weeks following the second subculture, callus production percentages and weights were measured. The MS-3 (1 mg/L 2,4-D + 0.5 mg/L kinetin) nutritional medium and hypocotyl explant were found to be particularly effective at producing callus. The second subculture's data on the number of plants that had successfully regenerated per callus, showed that the MS nutritional medium with 0.2 mg/L Thidiazuron (TDZ) was the best medium for plant regeneration. The dispersed calli were grown in a nutritional medium designed for suspension culture in a nutrient medium mixture comprising MS+0.1 mg/L kinetin. The results obtained with the optimization steps were used in the ongoing study.
Characterization of mutant garlic genotypes based on volatile sulfur compounds and mineral content
(Journal of Elementology, 2022-06-18) Beşirli, Gülay; Karakan, Faika Yaralı; Sönmez, İbrahim; Çetin, Berna Ergun; Erol, Ümit Haydar; Kantoğlu, K. Yaprak; Kunter, Burak; https://orcid.org/0000-0002-7247-9116; TENMAK-Nükleer Enerji Araştırma Enstitüsü-Ankara
This study was conducted to determine volatile sulfur compounds and mineral content of mutant garlic genotypes. The volatile sulfur compounds analysis was performed with a gas chromatography- mass spectrometer. The mineral content of mutant garlic genotypes was determined with an atomic absorption spectrometer and flame photometer. The results indicated that mutant garlic genotypes showed large variation in terms of their content of volatile sulfur compounds and minerals. A total of 16 volatile sulfur compounds were detected, which were mainly diallyl disulfide (68.09%), disulfide methyl propyl (52.34%), disulfide methyl 2-propenyl (29.81%), sulfide allyl methyl (25.72%), diallyl sulfide (22.38%) and disulfide dimethyl (9.88%). The macroand micro-elements detected in mutant garlic genotypes were K (232.45-513.25 mg L-1), Ca (2.19-7.35 mg L-1), Mg (7.38-21.64 mg L-1), Na (4.52-13.18 mg L-1), Cu (0.01-0.15 mg L-1), Fe (0.13-1.25 mg L-1), Mn (0.10-0.27 mg L-1), and Zn (0.12-0.69 mg L-1). As a result, it was determined that the content of both volatile sulfur compounds and minerals in mutant garlic genotypes was higher than in the control (cv. ‘Taşköprü 56’). The genotypes which had a higher content of both volatile sulfur compounds and minerals were GM1, GM8, GM18, GM20, GM21, GM22, GM33, GM35, GM36, GM37, GM39, GM40, GM46, and GM51. The research findings are extremely valuable in revealing the originality of mutant garlic genotypes obtained by mutation breeding, and establishing the foundation for an assessment of mutant garlic genotypes to be used in breeding programs.
Characterization of tomato genotypes by simple sequence repeats (SSR) molecular markers
(Biharean Biologist, Oradea, Romania, 2021-12-05) Aziz, Sibel; Kantoğlu, K. Yaprak; Tomlekova, Nasya; Staykova, Teodora; Ganeva, Daniela; Sarsu, Fatma; https://orcid.org/ 0000-0002-7247-9116; TENMAK-Nükleer Enerji Araştırma Enstitüsü-Ankara
Microsatellites are highly polymorphic regions containing gene loci represented by multiple alleles of different lengths and nucleotide sequences. The purpose of this study was to identify reproducible specific molecular profiles of tomato varieties and F1 hybrids from the collection of the Maritsa Vegetable Crops Research Institute, Bulgaria, and of mutant lines from the Nuclear Energy Research Institute, Turkey, by detecting polymorphic microsatellite loci as markers. The study included five varieties, four F1 hybrids Bulgarian tomato, five Turkish mutant lines, and an initial landrace analysed with 19 SSR markers located in different chromosomes of the tomato genome at a distance of 6.0 cM to 146.0 cM. Fifteen microsatellite markers were used to generate polymorphic profiles. The number of bands per microsatellite locus ranged from one to eight, with a total of 62 bands among the markers analysed. The average number of SSR alleles per locus was 3.26. The dendrogram constructed with the values of genetic distance showed that all fifteen genotypes are grouped into two major clusters. Twelve form one main cluster with subclusters, while the rest of them form the other cluster. The results of the present study complement the data on the genetic heterogeneity of tomatoes and could be useful for tomato breeding programes.
Çin Karanfili (Dianthus chinensis L.) İçin Mutasyon Islahı Çalışmasına Yönelik Etkili Mutasyon Dozun Belirlenmesi
(Dergipark, 2024-10-14) Çakın, Irmak; Kantoğlu, K. Yaprak; Kunter, Burak; Göktuğ, Aslıhan
Karanfil süs bitkileri içinde mutasyon ıslahına en yatkın olan türlerden bir tanesidir. Bu çalışmada ticari öneme sahip Çin karanfili çeşidinde (Dianthus chinensis L.) yeni çeşit geliştirilmesine yönelik olarak yürütülmesi planlanan mutasyon ıslahı çalışması için çeşide özgü etkili mutasyon dozunun belirlenmesi hedeflenmiştir. Etkili mutasyon dozunun (EMD50) belirlenmesinde fiziksel mutagen olarak (Sezyum 137) Cs137 gamma kaynağı kullanılmıştır. Karanfil tohumlarına 0, 50, 100, 200, 300, 400, 500 ve 600 Gy olmak üzere yedi farklı dozda ışınlama yapılmıştır. Her doz için otuz adet tohum ekilmiş olup, bu tohumların ışınlamadan 30 gün sonraki bitki gelişimleri gözlenmiştir. Işınlamadan ardından otuzuncu günde elde edilen bitkilerde sürgün gelişimine yönelik ölçümler alınmıştır. Bu ölçümlerden elde edilen ortalama veriler ile lineer regresyon analizi gerçekleştirilerek EMD50 belirlenmiştir. Yapılan analiz sonuncunda 172.16 Gy’lik doz EMD50 değeri olarak tespit edilmiştir.
Çin Karanfili (Dianthus chinensis L.) İçin Mutasyon Islahı Çalışmasına Yönelik Etkili Mutasyon Dozun Belirlenmesi
(D.Ü Ormancılık Dergisi, 2024-12-28) Çakın, Irmak; Kantoğlu Kadriye Yaprak; Kunter, Burak; Göktuğ, Aslıhan
Karanfil süs bitkileri içinde mutasyon ıslahına en yatkın olan türlerden bir tanesidir. Bu çalışmada ticari öneme sahip Çin karanfili çeşidinde (Dianthus chinensis L.) yeni çeşit geliştirilmesine yönelik olarak yürütülmesi planlanan mutasyon ıslahı çalışması için çeşide özgü etkili mutasyon dozunun belirlenmesi hedeflenmiştir. Etkili Mutasyon Dozunun (EMD50) belirlenmesinde fiziksel mutagen olarak (Sezyum 137) Cs137 gamma kaynağı kullanılmıştır. Karanfil tohumlarına 0, 50, 100, 200, 300, 400, 500 ve 600 Gy olmak üzere yedi farklı dozda ışınlama yapılmıştır. Her doz için otuz adet tohum ekilmiş olup, bu tohumların ışınlamadan 30 gün sonraki bitki gelişimleri gözlenmiştir. Işınlamanın ardından otuzuncu günde elde edilen bitkilerde sürgün gelişimine yönelik ölçümler alınmıştır. Bu ölçümlerden elde edilen ortalama veriler ile lineer regresyon analizi gerçekleştirilerek EMD50 belirlenmiştir. Yapılan analiz sonuncunda 172.16 Gy’lik doz EMD50 değeri olarak tespit edilmiştir.
Descriptive process mineralogy to evaluate physical enrich-ment potential of malatya/kuluncak rare earth ore through MLA
(2022-12) Ersoy, Burakhan; Beşirli, M. Umut; Topal, Selim; Soydaş Sözer, Belma; Burat, Fırat; TENMAK-Nadir Toprak Elementleri Araştırma Enstitüsü
Rare Earth Elements (REE) are indispensable parts of magnetic, phosphor, metal alloys, catalysts, ceramics, glass, polishing, and defense systems industries due to their unique physical and chemical properties. Currently, China is the largest supplier in the world with a production of more than 95% of the world’s Rare Earth Oxides (REO). To reduce the influence of China on the REE market, the countries have started to develop their national strategies for the production and use of REE-bearing resources. Within the scope of this study, particle size, chemical, MLA, XRD, and SEM-EDS analysis were performed for material character-ization, and shaking table, centrifugal, and magnetic separations were carried out for the beneficiation of Malatya/Kuluncak rare earth ore. The XRD analysis indicated that the representative sample consists of major minerals such as albite, calcite, montmo-rillonite, muscovite, titanite, kaolinite, clinochlore, and aegirine. Parisite, bastnaesite, Zr-REE-Silicate, Fe-REE-Oxide, and Ca-Ti-Nb-REE-Oxide were detected as REE-bearing minerals by MLA. The chemical analysis resulted in a ∑REO grade of 3,628 g/t and the ore consists of mostly light REE. According to the result of the gravity separation for the coarsest fraction, about 11.3% by weight of the total feed was concentrated as a heavy product assaying 6,437 g/t ∑REO. As a result of magnetic separa-tion, magnetic products with 5,561 g/t and 6,013 g/t ∑REO were obtained at coarse and fine fractions, respectively. Finally, the characterization studies and enrichment results were correlated, and very important and meaningful indications about the be-havior of REE-bearing minerals were obtained.
Descriptive Process Mineralogy to Evaluate Physical Enrich-ment Potential of Malatya/Kuluncak Rare Earth Ore through MLA
(MDPI, 2023-09-12) Ersoy, Burakhan; Beşirli, Mehmet Umut; Topal, Selim; Soydaş Sözer, Belma; Burat, Fırat
Rare Earth Elements (REE) are indispensable parts of magnetic, phosphor, metal alloys, catalysts, ceramics, glass, pol-ishing, and defense systems industries due to their unique physical and chemical properties. Currently, China is the largest sup-plier in the world with a production of more than 95% of the world’s Rare Earth Oxides (REO). To reduce the influence of China on the REE market, the countries have started to develop their national strategies for the production and use of REE-bearing resources. Within the scope of this study, particle size, chemical, MLA, XRD, and SEM-EDS analysis were performed for material characterization, and shaking table, centrifugal, and magnetic separations were carried out for the beneficiation of Mala-tya/Kuluncak rare earth ore. The XRD analysis indicated that the representative sample consists of major minerals such as albite, calcite, montmorillonite, muscovite, titanite, kaolinite, clinochlore, and aegirine. Parisite, bastnaesite, Zr-REE-Silicate, Fe-REE-Oxide, and Ca-Ti-Nb-REE-Oxide were detected as REE-bearing minerals by MLA. The chemical analysis resulted in a ∑REO grade of 3,628 g/t and the ore consists of mostly light REE. According to the result of the gravity separation for the coars-est fraction, about 11.3% by weight of the total feed was concentrated as a heavy product assaying 6,437 g/t ∑REO. As a result of magnetic separation, magnetic products with 5,561 g/t and 6,013 g/t ∑REO were obtained at coarse and fine fractions, respective-ly. Finally, the characterization studies and enrichment results were correlated, and very important and meaningful indications about the behavior of REE-bearing minerals were obtained.
Determination of mutagenic-sensitivity and induced variability in the mutant populatıons of ‘Bacardi’ chrysanthemum cultivar
(Genetika Belgrade, 2022-05-26) Haspolat, Gülden; Kunter, Burak; Kantoğlu, K. Yaprak; https://orcid.org/ 0000-0002-7247-9116; TENMAK-Nükleer Enerji Araştırma Enstitüsü-Ankara
Mutation breeding is one of the most important breeding method for ornamental plants. Chrysanthemum is the genus that has the richest mutant varieties in ornamental plants. The objective of this study is to create variation by gamma irradiation and improving traits by mutation breeding. For this aim, in vitro bud explants of white Bacardi variety were irradiated by gamma radiation at 20 Gy (Gray). In vitro subcultures were continued until M1V4 period and observations were obtained in this period. Some changes were observed on heights and flowers of the plants such as; variable flowers, flowering time, differentiation on plant length, flower number per bunch and ray floret differentiations. The changes of the ray florets were determined as color changes to pink and yellow. Mutation frequency was calculated by 1.1% of the population. Approximately 0.9% of useful mutant lines determined from the selected mutants.
Development of CuO nanoparticles modified electrochemical sensor for detection of salbutamol
(Iop Publishing, 2024-04-29) Koc Delice, Tulay; Ak Azem,Funda; Ozdemir, Kazim; Alpat, Senol
Metal oxide structures are being utilized in an increasing variety of applications. This study used cyclic and differential pulse voltammetry techniques to investigate the possible utilization of copper oxide (CuO) nanoparticles modified carbon paste electrode (CPE)for the redox reactions of salbutamol (SAL). The electrochemical performance of the SAL analyte in a complex matrix environment in Ventolin was evaluated in order to assess the appropriateness of the proposed sensor in a real sample environment. CuO nanoparticles were produced via a straightforward, cost-effective and efficient sol– gel method, and characterization studies of synthesized CuO nanoparticles were performed by scanning electron microscopy, x-ray Diffraction (XRD), and x-ray photoelectron spectroscopy. The synthesized CuO nanoparticles had a spherical shape and particle size was found to be 74 nm. The crystal size of the CuO particles was calculated to be 21.79 nm using the Debye–Scherrer equation. Under optimal conditions, differential pulse voltammetry demonstrated a linear response in the 50 nM to 100 μM range, with a salbutamol detection limit of 50 nM (S/N = 3). The SAL concentration (R2= 0.9971)was found to have a good correlation coefficient. The reproducibility of the biosensor was investigated and evaluated with a relative standard deviation of 3% (n = 8). The storage stability of CuO modified CPE for two weeks was evaluated based on the response of DP current measured at intervals every two days. According to the measurement results, the modified electrode exhibited good stability and reproducibility while maintaining 80% of its stability. It is also a rapid and dependable sensor candidate with a measurement time of approximately 20 s. The developed electrode has been utilized successfully to determine doping material with improved performance.
Effects of gamma irradiation on seed germination in watermelon (Citrullus lanatus (Thunb.) matsum & nakai) and determination of effective mutation dose
(T.C. Tarım ve Orman Bakanlığı Tarımsal Araştırmalar ve Politikalar Genel Müdürlüğü Alata Bahçe Kültürleri Araştırma Enstitüsü Müdürlüğü, 2022-06-01) Kantoğlu, K. Yaprak; https://orcid.org/ 0000-0002-7247-9116; TENMAK-Nükleer Enerji Araştırma Enstitüsü-Ankara
Bu çalışma, Doğu Karadeniz Bölgesinde lokal olarak yetiştiriciliği yapılan Yalıncak karpuzunda (köy populasyonu) yürütülmesi planlanan mutasyon ıslahı çalışması için “Etkili Mutasyon Dozu” (EMD50)’nun belirlenmesi amacı ile yürütülmüştür. Bu amaçla, karpuz tohumları Co60 kaynağı ile 0, 150, 250 ve 350 Gy dozlarında ışınlanmıştır. Tohum ekimini takip eden 10. ve 30. günde, her doz için ışınlanan tohum ve bunlardan gelişen fidelerde farklı ışın dozlarının çimlenme, kök ve sürgün gelişimleri üzerine olan etkileri incelenerek, EMD50 değeri lineer regresyon analiziyle hesaplanmıştır. Buna göre yapılan uygulama sonucunda 278 Gy EMD50 olarak belirlenirken, 150 Gy’lik uygulamanın kontrol ve diğer ışınlama dozlarına göre ışınlamayı takip eden ilk on günlük sürede çimlenmeyi uyardığı ancak 350 Gy’lik uygulamanın tohum çimlenmesi üzerinde olumsuz etkisi olduğu %46’lık çimlenme oranı ile ortaya konmuştur. Yalıncak genotipinde yürütülecek mutasyon ıslahı çalışmalarında EMD5ö’nin %10 alt ve üst sınırları göz önüne alınarak 250-305 Gy arasındaki uygulamaların geniş bir varyasyon oluşumunu sağlayacak dozlar olduğu belirlenmiştir.
Enhanced Alpha Decay Half-Life Determination in Super-Heavy Nuclei Using a New Potential
(Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu (TENMAK), 2024-07-05) Yıldırım, Aydın; Boztosun, İsmail; Küçük, Yasemin; Gusseinova, Diana; Alimov, Dilshod; Bakirov, Mardan
This paper systematically investigates alpha decay half-lives in the superheavy nuclei region (104 ⩽ Z ⩽ 118), focusing on ground-state to groundstate transitions. It aims to enhance the accuracy of alpha decay half-life calculations by introducing a modi ed nuclear potential that includes surface deformation. Advanced techniques such as Bohr-Sommerfeld quantization conditions and Langer modi cations are used to develop an e ective potential for the interaction between the daughter nucleus and the alpha particle. The Woods-Saxon potential, modi ed with a Gaussian term to account for surface deformation, is employed in numerical calculations of alpha decay half-lives. These calculated half-lives are compared with experimental data and the previous studies, showing signi cantly improved agreement. The modi ed potential o ers greater precision in modeling the alpha decay process, particularly for even-even super-heavy nuclei. This research introduces a novel approach to alpha decay studies, enhancing accuracy and applicability. The modi ed nuclear potential with surface deformation proves to be a valuable tool in nuclear physics, providing more reliable alpha decay half-life estimates. The implications of this work extend to the creation of new super- heavy nuclei and astrophysical processes. Further research can build upon these ndings to explore a broader range of nuclear systems and advance our understanding of nuclear physics.
EXPERIMENTAL AND THEORETICAL ASSESSMENT OF SELECTED POLLUTANTS TREATED WITH GAMMA RADIATION AND HYDROGEN PEROXIDE
(Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu (TENMAK), 2024-11-28) 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 a 60Co 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.
Exploring the Photoluminescence Origins of Natural Boron Mineral (Tincal) and Its Waste Byproducts
(SSRN 4891422, 2024-07-10) Karacaoglu, Erkul; Yungevis, Hasan; Acikgoz, Sabriye; Gul, Mert; Ates, Esen Gul; Yildirim, Cennet
Many natural minerals can exhibit luminescence due to impurities and their crystal structures. Evaluating the waste generated from processing these materials presents significant research opportunities. This study explores tincal, a natural boron source, and its waste, discussing their structural and luminescence properties. Both the mineral and its waste show similar phases like dolomite and calcite. In terms of luminescence, both exhibit PL emission in the 500-650 nm range. Emphasis is placed on evaluating the waste, with heat treatment revealing notable changes. At temperatures exceeding 500°C, the waste transforms from dolomite to monticellite, causing a red-shift in PL emission to the 600-850 nm range. XPS analysis of untreated and heat-treated waste confirms elemental compositions, highlighting the influence of boron on structural changes during heat treatment, despite trace elements like Mn and Fe being undetected.
FAST AND THERMAL NEUTRON REMOVAL CROSS-SECTION FOR CERAMIC GLASS ALUMINUM OXYNITRIDE
(Dergipark, 2024-09-08) Yıldırım, Aydın
This study investigates the effectiveness of transparent aluminum oxynitride (AlON) in neutron shielding, focusing on both fast and thermal neutrons. Using conventional radiation attenuation parameters, the macroscopic neutron removal cross-sections of AlON were calculated for varying neutron energies and material thicknesses. The Geant4 simulation toolkit was employed to model and analyze the neutron interactions with AlON. The results indicate that AlON exhibits a high neutron shielding capacity for fast neutrons (2 MeV), with transmission factor values ranging from 0.783 to 0.260 for material thicknesses between 1 and 10 cm. These values are nearly identical to those for water, which range from 0.782 to 0.257, highlighting AlON's comparable performance. However, for thermal neutrons, AlON's performance was less effective, only surpassing lead but not concrete or water. The findings suggest that while AlON is highly effective for fast neutron shielding, it may require complementary materials to adequately shield thermal neutrons. This could involve using AlON in combination with other materials to create a more comprehensive neutron shielding solution. AlON shows significant potential as a neutron shielding material, particularly for fast neutrons. Its integration with additional shielding materials could enhance its overall effectiveness, making it suitable for various nuclear and radiation protection applications.

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