Sinop Üniversitesi Kurumsal Akademik Arşivi
DSpace@Sinop, Sinop Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Approximation Results on an Infinite Interval Based on Power Series Statistical Sense
(Padova Univ Press, 2025) Yildiz, Sevda; Demirci, Kamil; Dirik, Fadime
This paper introduces a new approximation theorem, type of Korovkin, for positive linear operators (pLO) defined on the Banach space C-* [0, infinity) comprising all real-valued continuous functions on [0, infinity) that converge to a finite limit as their argument approaches infinity. By applying statistical convergence with respect to power series methods and employing the test functions 1, exp(-u) and exp(-2u), we derive a novel approximation result. Our findings demonstrate that the proposed method outperforms classical and statistical approaches, as illustrated by a concrete example. Furthermore, we explore the rate of convergence associated with this new approximation theorem.
From the People, Against the People: Banditry in Turkey during the National Struggle
(Osman Kose, 2025) Tekir, Suleyman; Balaban, Tugrul
When the phenomenon of banditry is analyzed from a historical perspective, it is considered as movements that emerge from within the public against the social order and paradoxically manifest themselves against the public and encompass collective rebellion. Due to their local character and limited organizational capacity, these organizations could not evolve into a sustainable resistance movement and were systematically liquidated by the state mechanism. This study analyzes the activities of gang and bandit groups operating in Turkey during the National Struggle in the period 1920-1924 based on archival documents. During the period of the War of Independence, politically motivated rebellion movements that emerged with the provocation and encouragement of external actors stand out. Although banditry cases, which can be categorized as ordinary banditry, were considered as isolated incidents, these activities emerged as the dominant factor threatening the social order of the country. Banditry acquired a dichotomous character in the period in question: Organizations that supported the National Struggle and those that acted under the influence of external factors. These two new movements replaced the traditional banditry paradigm.
INVESTIGATING THE POTENTIAL FUELS FOR DFRm REACTOR CONCEPT
(Nuclear Society Slovenia, 2024) Daydas, Semra; Tiftikci, Ali
The Dual Fluid Reactor (DFR) is a conceptual design that combines the advantageous properties of two of the selected Gen IV reactor concepts: the Molten Salt Reactor (MSR) and the Lead Cooled Fast Reactor (LFR). In the DFR molten salt is used (from MSR) in a separate circuit and is cooled by the molten lead (from LFR). In the DFR, molten fuel flows inside the SiC fuel tubes while being cooled by lead that flows around these fuel tubes. The advantages of these two separate cycles enable the use of undiluted fuel salts and metallic fuels. Therefore, there are mainly two DFR concepts named DFRs and DFRm which use molten salt and molten metallic fuel respectively. In this study, neutronic analysis has been conducted for the DFRm design by using SERPENT code. Reference DFRm reactor uses U-Cr metallic fuel with the lowest temperature of 860 degrees C with 4.78 wt. % Cr, %12.8 wt.% U-235 and 82.42 wt.% U-238 composition. To increase the operation temperature margin U-Ni and U-Fe fuels are proposed. U-Ni eutectic metallic fuel reaches its lowest melting point at 740 degrees C with 11 wt.% nickel and 89 wt.% uranium composition. As for U- Fe fuel, fuel composition at the eutectic point is 10.2 wt.% Fe and 89.8 wt.% uranium at 725 degrees C. It is shown that both U-Ni and U-Fe fuels have similar k(eff) trends with the reference U-Cr fuel with lower k(eff) values. This is because proposed fuel compositions have lower uranium content. To reach the same k(eff) values U-235 content in the fuel must be higher for both U-Ni and U-Fe fuels. Thus, with these fuels in the DFRm core, it is possible to reduce the fuel freezing risk and by this, the safety would be increased and ensure a wider operating temperature range.
Protective effect of Asphodelus aestivus Brot. on bladder injury due to ischemia-reperfusion: Biochemical and histopathological Study
(Natl Inst Science Communication-Niscair, 2025) Kopar, Hatice; Yagmur, Isil; Kurutas, Ergul Belge; Tural, Rabia
Severe oxidative stress caused by reperfusion after ischemia in the bladder causes serious functional and structural damage. New molecules with antioxidant effects are needed to protect against this damage. In our study, we aimed to investigate the effect of Asphodelus aestivus on the oxidant-antioxidant system in bladder ischemia/reperfusion (I/R) injury induced in rats biochemically and histopathologically. In our study, 24 three-month-old male Wistar-Albino rats weighing 250-300 g were randomly divided into 3 groups of 8 rats each: sham group (I/R+serum physiological, 1mL) (group 1), I/R group (group 2), I/R+A. aestivus group (50 mg/kg/day) (treatment group, group 3). At the end of the experiment, all rats were sacrificed and their bladder tissues were taken and divided into 2 parts for biochemical and histopathological examination. Protein amount, malondialdehyde (MDA) levels and superoxide dismutase (SOD) and catalase (CAT) enzyme activity levels were measured spectrophotometrically, and histopathological examination was performed under a light microscope. MDA levels were significantly higher and CAT activity was significantly lower in the I/R group compared to the sham and treatment groups (P<0.05). In histopathological examination, it was determined that there was a significant regression and/or decrease in the findings caused by I/R injury in the group treated with A. aestivus. A. aestivus has a protective effect in reducing oxidative stress in bladder I/R injury.
Association of Human Endogenous Retrovirus HERV-K18 Variant with Bipolar Disorder Type I
(Korean Coll Neuropsychopharmacology, 2025) Yegin, Zeynep; Sarisoy, Gokhan; Avsar, Cumhur; Aral, Ayse Erguner; Koc, Haydar
Objective: Human endogenous retroviruses (HERVs) and associated sequences occupy similar to 8% of the human genome and dysregulation of HERV transcripts may have significant impacts on human health including psychiatric disorders. HERV-K18 is still active in the human genome and its envelope gene encodes a superantigen (SAg) which may result in deregulation of the immune system. In the study, the possible associations of the two variants localized in the SAg-coding region of HERV-K18 with bipolar disorder type I (BD-I) were evaluated. Methods: The subjects included 100 patients with BD-I and 100 age- and sex-matched healthy controls. The effects of the two HERV-K18 variants (HERV-8594 and HERV-8914) were analyzed with polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. The possible associations of the genotypes/alleles in BD-I patients with several clinical and demographic data were also evaluated. Results: HERV-8914 TT genotype had approximately 5.36 times higher risk of BD-I than those with the CC genotype (odds ratio, 5.386; 95% confidence interval, 1.602-18.110). Moreover, the prevalence of the CC genotype in patients with hypomania (31.25%) was found to be higher than that observed in patients without hypomania (10.71%) (Fisher's Conclusion: This is the first study implying that HERV-K18 variations may be associated with the pathogenesis of BD-I.
