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排序方式: 共有119条查询结果,搜索用时 15 毫秒
1.
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
2.
The present study investigates the influence of Cu and Al on microstructure and wear behavior of a eutectic Sn-9Zn solder alloy. The Sn-9Zn–X alloy was produced by adding various amounts of Cu and Al through investment casting method. The produced Sn-9Zn–X alloys were characterized by a scanning electron microscope, X-ray diffraction, and hardness measurements. In wear tests at 1 ms?1 sliding speed, 10 N load and 5 different sliding distances (400–2000 m) were used. The results show that as the amount of Cu and Al increased within Sn-9Zn alloy, the hardness of the alloy increased as well. Depending on the increase in hardness of the alloys produced by investment casting, it was observed that weight loss decreased during wear tests. Furthermore, the same proportion of added Al alloys’ hardness and weight loss were observed to be higher than the added Cu alloys. Furthermore, the Cu-added alloy exhibited higher hardness and lower weight loss than the Al-added alloy did. 相似文献
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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
5.
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
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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.
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
10.
Energy is one of the indispensable factors regarding the assurance of social prosperity and economic development of a country. The developing countries struggle to obtain energy sources reliable in the long term to complete their economic development, and the developed countries struggle to get them to keep their present prosperity levels. Coal seems to continue its indispensable position among the other energy sources for many years because of its production in more than 50 countries, the least effect it has from the price fluctuation and its usage lifespan of more than 200 years. The countries that are aware of it have investments in mining fields in the countries rich in coal reserves, and they continue investing considerable amount of money. 相似文献