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排序方式: 共有120条查询结果,搜索用时 15 毫秒
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Mert Yıldırım Muharrem Gökçen Tuncay Tunç İbrahim Uslu Şemsettin Altındal 《Polymer Engineering and Science》2014,54(8):1811-1816
Temperature dependent current‐voltage (I–V) measurements of Au/Polyvinyl Alcohol + Bi2O3/n‐Si structure were conducted between 100 and 350 K for investigating the temperature dependence of I–V characteristics and current conduction mechanisms in the structure. Series resistance of the structure is calculated using Ohm's law and Cheungs' method. Ideality factor (n) and zero‐bias barrier height (ΦBo) were obtained considering thermionic emission theory. From 100 to 350 K, n changed from 32.1 to 3.54, and ΦBo changed from 0.27 to 0.99 eV. Obtained temperature dependent values of n and ΦBo suggested that thermionic emission is not the dominant current conduction mechanism. Therefore, Ln(I)–Ln(V) curves of the studied structure were plotted for investigating current conduction mechanisms in the structure and current flow is explained considering space charge limited current. Moreover, density of interface states (Dit) in the structure were calculated and its temperature dependence was investigated such that Dit values are reduced to the order of ~1013 eV?1 cm?2 from ~1014 eV?1 cm?2 with increasing temperature. POLYM. ENG. SCI., 54:1811–1816, 2014. © 2013 Society of Plastics Engineers 相似文献
3.
Simonetta Pazzaglia Barbara Tanno Ilaria De Stefano Paola Giardullo Simona Leonardi Caterina Merla Gabriele Babini Seda Tuncay Cagatay Ammar Mayah Munira Kadhim Fiona M. Lyng Christine von Toerne Zohaib N. Khan Prabal Subedi Soile Tapio Anna Saran Mariateresa Mancuso 《International journal of molecular sciences》2022,23(4)
Cell communication via exosomes is capable of influencing cell fate in stress situations such as exposure to ionizing radiation. In vitro and in vivo studies have shown that exosomes might play a role in out-of-target radiation effects by carrying molecular signaling mediators of radiation damage, as well as opposite protective functions resulting in resistance to radiotherapy. However, a global understanding of exosomes and their radiation-induced regulation, especially within the context of an intact mammalian organism, has been lacking. In this in vivo study, we demonstrate that, compared to sham-irradiated (SI) mice, a distinct pattern of proteins and miRNAs is found packaged into circulating plasma exosomes after whole-body and partial-body irradiation (WBI and PBI) with 2 Gy X-rays. A high number of deregulated proteins (59% of WBI and 67% of PBI) was found in the exosomes of irradiated mice. In total, 57 and 13 miRNAs were deregulated in WBI and PBI groups, respectively, suggesting that the miRNA cargo is influenced by the tissue volume exposed to radiation. In addition, five miRNAs (miR-99b-3p, miR-200a-3p, miR-200a, miR-182-5p, miR-182) were commonly overexpressed in the exosomes from the WBI and PBI groups. In this study, particular emphasis was also given to the determination of the in vivo effect of exosome transfer by intracranial injection in the highly radiosensitive neonatal cerebellum at postnatal day 3. In accordance with a major overall anti-apoptotic function of the commonly deregulated miRNAs, here, we report that exosomes from the plasma of irradiated mice, especially in the case of WBI, prevent radiation-induced apoptosis, thus holding promise for exosome-based future therapeutic applications against radiation injury. 相似文献
4.
Cebrail Çiflikli A. Tuncay Özşahin A. Çağrı Yapici 《Wireless Personal Communications》2009,51(2):221-229
The many advantages responsible for the widespread application of orthogonal frequency division multiplexing (OFDM) systems
are limited by the multipath fading. In OFDM systems, channel estimation is carried out by transmitting pilot symbols generally.
In this paper, we propose an artificial neural network (ANN) channel estimation technique based on levenberg-marquardt training
algorithm as an alternative to pilot based channel estimation technique for OFDM systems over Rayleigh fading channels. In
proposed technique, there are no pilot symbols which added to OFDM. Therefore, this technique is more bandwidth efficient
compared to pilot-based channel estimation techniques. Also, this technique is making full use of the learning property of
neural network. By using this feature, there is no need of any matrix computation and the proposed technique is less complex
than the pilot based techniques. Simulation results show that ANN based channel estimator gives better results compared to
the pilot based channel estimator for OFDM systems over Rayleigh fading channel. 相似文献
5.
The results of current investigation demonstrate that mechanochemical processing can be used to synthesize high purity Fe2B nanocrystals by selecting well-optimized milling conditions, reaction paths and proper starting materials. Microstructure, phase analyses, specific surface area, and magnetic properties of the synthesized nanocrystals were examined by using X-ray diffraction/spectroscopy, electron microscopy, nitrogen adsorption–desorption methods following Brunauer-Emmett-Teller equation and vibrating sample magnetometer techniques, respectively. Removal of MgO impurity phase by leaching the resulting powder in the acetic acid solution yielded single phase Fe2B nanocrystals with the crystallite size and specific surface area of 12.5 nm and 29 m2/g, respectively. Magnetization results clearly indicated the ferromagnetic behavior of Fe2B nanocrystals with saturation magnetization observed around 96.26 emu·g?1. Electron microscope images revealed coaxial/spherical powder shape and morphology of the single-phase Fe2B nanocrystals. 相似文献
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7.
Experiments show that the strength of nanostructures can be very high and that strength statistics are dominated by surface
flaws. To understand the dependence of strength on the surface morphology, a series of fracture mechanics based Monte-Carlo
simulations were performed. The surfaces of previously tested Si nanobeams were measured, statistically characterized and
equivalent surfaces were generated. The surface profiles consist of bunched steps with varying heights and widths. At the
root of each step, there is a stress singularity defined by a stress intensity factor. The beams were assumed to fail when
the stress intensity factor anywhere on the surface exceeds the fracture toughness. In agreement with experiments, simulations
show that even a small increase in the surface roughness results in a significant reduction in the strength of nanostructures.
Thus, careful attention to the surfaces is essential for optimum strength and reliability at the nanoscale. 相似文献
8.
R. Ulusay E. Tuncay N. Hasancebi 《Bulletin of Engineering Geology and the Environment》2010,69(3):397-410
Peats consist of the partly decomposed remains of vegetation, which have accumulated in waterlogged areas. They are often
unsuitable for supporting structures of any kind due to their high water content, high compressibility, low shear strength
and high degree of spatial variability. The paper reports a preliminary study on peats from industrial sites in the city of
Kayseri, Turkey. The soils in the study area are classified as peat to muck. The peats are fibrous at shallow depth and become
amorphous as they extend to some 8 m depth. The ranges of geo-engineering properties are generally consistent with those reported
in the literature, with some variation due to their higher mineral soil contents. The behavior of the peats is essentially
frictional, with high friction and relatively small cohesion. The direct shear tests yielded higher shear strengths than those
from the triaxial tests, due to the fact that the peat specimens used in the direct shear tests were rich in fibers and mineral
soils. Back analysis of the settlement of heavy rolls of metal wires laid on the peat generally confirmed the consolidation
properties of the soil determined in laboratory. 相似文献
9.
Ozdemir Erdem Tevfik Kartal Ugur Dikici Tuncay Erol Mustafa Yurddaskal Metin 《Journal of Materials Science: Materials in Electronics》2021,32(23):27398-27408
Journal of Materials Science: Materials in Electronics - In this study, zinc oxide (ZnO) nanowires (NWs) were successfully produced on Zn plates through electrochemical anodization in potassium... 相似文献
10.
Tuncay Saydam 《Journal of Network and Systems Management》1997,5(3):233-255
A multimedia service architecture is constructedby using a generic component model. In order to derivespecific components, a generic service agent and genericservice component architectures are developed. Using generic agent and the service components,a TINA-C conformant object-oriented hierarchical genericservice component is developed and presented. As anexample, a multimedia QoS service and management architecture is presented. 相似文献