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RISS 인기검색어
- 검색키워드
- 저자 : Filiz Keles (검색결과 5 건)
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Modulated 3D light absorption profile in GaN nanorod arrays
Keles Filiz,Seo Hye-Won 한국물리학회 2021 Current Applied Physics Vol.22 No.-
The depth dependent UV-light absorption profile of GaN nanorods with different lattice arrays and filling factors was studied using finite-difference time-domain (FDTD) methods. By comparing to the results from Lambert- Beer’s law with Maxwell-Garnett effective medium theory, we identified the quantitative contribution from nano-scattering effect on the light absorption in the nanorod arrays. The FDTD study of graphical 3D profile of light absorption and electric field intensity was parallelly conducted to investigate the origin of the nanoscattering. We found that the coupled electric field in the gap regions led to the larger absorption crosssection of the nanorod arrays, which is attributed to the distorted depth profile of the light absorption.
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Filiz Keles,김일환,서혜원 한국진공학회 2022 Applied Science and Convergence Technology Vol.31 No.6
Finite-difference time-domain simulation of GaN nanorod arrays with linearly polarized ultraviolet (UV) (325 nm) and visible (513 nm) light has been carried out. Enhanced light absorption of nanorods with confined electric field in the surrounding gap was observed. To identify the rationale of this finding, we studied their three-dimensional graphical profile and then realized that 1) modal resonance is developed with absorption gain in the UV region and 2) reflection at the interface with substrate leads to a subtle increase of absorption of visible light. By solving the eigenvalue equation, we also confirmed that TM11 mode of leaky-mode resonance is responsible for the observed modal absorption of UV light.
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Finite-difference time-domain study of Si nanorod arrays with UV and green light
Keles Filiz,Seo Hye-Won 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.10
The fnite-diference time-domain (FDTD) simulation on the absorption properties of Si nanorods with diferent spacings at UV and green light has been conducted. It was revealed that the enhanced absorption along the sidewalls of Si nanorods occurred, parallel to the light polarization directions, at UV-light while the green light is literally confned towards the nanorod center which leads to the V-shape absorption. The signifcant diference in absorption profle at two diferent illuminations is mainly due to the distinct origin of the light-matter interactions. For the UV light, the polarization induced local electric feld in the gap between nanorods is responsible for the results observed. However, the confned prolonged absorption of the green light is attributed to the non-negligible total internal refection inside Si nanorod waveguide.
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Gurhan Keles,Filiz Yildiz-Akgul,Veli Kocaman 아세아·태평양축산학회 2017 Animal Bioscience Vol.30 No.3
Objective: The current study compared the effects of dietary levels of two phase stoned olive cake (OC) in form of silage (OCS) on milk production and quality of Saanen goats. Methods: The OCS included in total mixed ration (TMR) at dry matter proportions of 0.0 (OC0), 0.10 (OC10), and 0.20 (OC20). The TMR were fed to a total of 18 goats in a completely randomized design for a period of 5 weeks. Results: Dietary treatments had no effect on the milk yield of Saanen goats, but the daily milk fat production was greater (p<0.05) at feeding OC20. The total phenolic (TP) compounds contents increased (p<0.01) in each increment of OCS in TMR and this was also reflected in the TP contents of milk. The C8:0, C10:0, C12:0, and C14:0 saturated fatty acids (FAs) in milk fat decreased (p<0.01) with increasing dietary level of OCS, but the decrease (p<0.001) in C16:0 and the increase (p<0.01) in C18:0 in milk fat occurred similarly at each inclusion level of OCS. Only OC20 reduced (p<0.05) the total saturated FA, yet the reduction (p<0.01) in n6/n3 ratio and atherogenicity index occurred in both OC10 and OC20. Conclusion: Two phase stoned OCS increases milk quality not only through modifying the milk FA composition, but also by increasing the milk TP content. These favorable changes in milk quality are closely associated with the dietary level of OCS.
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Ahmet Goktug Ertem,Filiz Ozcelik,Haci Ahmet Kasapkara,Cemal Koseoglu,Serdal Bastug,Huseyin Ayhan,Cenk Sari,Nihal Akar Bayram,Emine Bilen,Tahir Durmaz,Telat Keles,Engin Bozkurt 대한심장학회 2016 Korean Circulation Journal Vol.46 No.6
Background and Objectives: In this study, we examined the role of inflammatory parameters in an apical mural thrombus with a reduced ejection fraction due to large anterior myocardial infarction (MI). Subjects and Methods: A total of 103 patients who had suffered from heart failure, 45 of whom had left ventricular apical thrombus (AT) after a large anterior MI, were enrolled in the study. A detailed clinical history was taken of each participant, biochemical inflammatory markers, which were obtained during admission, were analyzed and an echocardiographical and angiographical evaluation of specific parameters were performed. Results: There were no statistically significant differences in terms of age, gender, and history of hypertension, diabetes mellitus, and atrial fibrillation between both groups (p>0.05). Similarly there were no statistically significant differences in terms of biochemical and echocardiographic parameters (p>0.05). However, there were significant differences in terms of neutrophil lymphocyte ratio (p=0.032). After a multivariate regression analysis, neutrophil lymphocyte ratio (NLR) was an independent predictor of thrombus formation (ß: 0.296, p=0.024). The NLR >2.74 had a 78% sensivity and 61% specifity in predicting thrombus in patients with a low left ventricular ejection fraction. Conclusion: In this study, neutrophil lymphocyte ratios were significantly higher in patients with apical thrombus.
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