Browsing by Author "Sayin S."

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    The clinicopathological features and survival of Castleman disease: A multicenter Turkish study
    (Verduci Editore s.r.l, 2022) Yildiz J.; Bagci M.; Sayin S.; Kaya A.; Yilmaz F.; Ekinci O.; Dal M.S.; Basturk A.; Aydogdu I.; Albayrak M.; Dogan A.; Erkurt M.A.; Korkmaz S.; Ulas T.; Eser B.; Altuntas F.
    Objective: In this study, we aimed to investigate the clinicopathological features and survival of CD, which is quite rare and has many unknowns. Patients and Methods: This study was conducted by retrospectively evaluating patients diagnosed with CD in six different centers in Turkey. Results: The median age of 33 patients included in the study was 49 and 51.5% (n = 17) of these patients were women. 18 (54.5%) patients were in the hyaline vascular subtype and most of the patients were UCD (n = 20, 60.6%). The most common involvement region was head and neck (n = 19, 57.5%). The UCD group was younger than the MCD group (p=0.027). Visceral lymph node involvement was higher in MCD than in UCD (p=0.001). Similarly, it was observed that there was more hepatomegaly (p=0.035) and splenomegaly (p=0.013) in the MCD group. During the median 19.5 months follow-up period, there were no patients who died. Conclusions: It was observed that UCD and MCD are different clinical entities. Promising survival times can be achieved with surgical and systemic treatments in both subtypes of this extremely rare disease. However, this result should be supported by well-designed prospective comprehensive studies. © 2022 Verduci Editore s.r.l. All rights reserved.
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    Optimization of HIL-HTL-free naphthalimide: Isoquinoline TEOLEDs with BZO top electrode
    (Elsevier Ltd, 2023) Fiat Varol S.; Sayin S.; Merdan Z.
    The present work focuses mainly on HIL/HTL-free TEOLEDs with furan-appended naphthalimide: isoquinoline (furan IQ) and morpholine-appended naphthalimide: isoquinoline (morpholine IQ), which were synthesized from the reaction between naphthalic anhydride and a substituent such as 2-furoic hydrazide or 4-aminomorpholine. Both of the emitters displayed aggregation-induced emission enhancement (AIEE) behavior. This new structure was constructed between modified indium tin oxide (ITO) with caesium fluoride (CsF) (5.18 eV) and boron-doped zinc oxide (BZO) (3.20 eV) with ideal work functions. The current densities were 400 mA.cm−2 and 387 mA.cm−2 and luminances were in the range of 9500 cd.m−2 9000 cd.m−2 for the furan IQ and morpholine IQ emitters, respectively. We have introduced a new CsF-ITO/EML/LiF/BZO design with external quantum efficiencies (EQEs) of 9.50 % and 7.57%. We have achieved a standard deep violet/blue CIE coordinates of (0.15, 0.06) and (0.16, 0.05) for furan IQ and morpholine IQ emitters with a high color stability. © 2023 Elsevier Ltd
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    Dielectrical parameters and relaxation of Al/NFT/p-Si schottky diode with frequency dependence
    (Yildiz Technical University, 2023) Karagöz E.; Fıat Varol S.; Sayin S.; Merdan Z.
    The fabricated Al/ Naphthalimide /p-Si Schottky diode’s dielectrical parameters and series resistance effect have been investigated by using the DC and AC measurements. W e have developed a facile interface structure that consisted of double-layer films in order to investigate the capacitance volume and series resistance effect through the device. The organic interlayer with little nanometer thickness between electrode and inorganic semiconductor drastically reduce the series resistance at the interface. The dielectric parameters have increased with decreasing frequency. Interestingly, the value of ε´ (≈3) even at 1 kHz shows that the prepared naphthalimide (with Thiophene property) nano-interlayer can provide more charges or energy storage ability and so it can be used instead of traditional interfacial layers. © 2023 Sigma J Eng Nat Sci. All rights reserved.