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RISS 인기검색어
- 검색키워드
- 저자 : Nazmi Ekren (검색결과 2 건)
- 무료
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- 유료
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Reinforcement of sheep-bone derived hydroxyapatite with bioactive glass
Nazmi Ekren 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.1
Productions, mechanical and microstructural analyses of bioglass/sheep hydroxyapatite (SHA) composites are introduced. Bioglass were added to calcinated SHA with various concentrations 5 and 10 wt. %. Powder mixture compacted with pressure(350 MPa) in steel moulds to obtain cylinder samples. As the next step, samples sintered in air at various temperatures (1000,1100, 1200, 1300 oC for 4 hrs). Compression strength test, density and the Vickers microhardness (HV) measurements werecarried out and microstructural characterizations were performed by scanning electron microscopy (SEM) and X-raydiffraction analysis (XRD) in order to determine optimum sintering temperature and mechanical properties. At last averagehardness value 1612 ± 80 HV, average density of 2.65 ± 0.31 g/cm3, and compressive strength value of σavr = 99.14 MPa wereobtained by sintering at 1300 oC with the addition of 5 wt. % bioglass in SHA. Results show potential of brittle biomaterialbut resistant to plastic strain.
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A Review of Line Suspended Inspection Robots for Power Transmission Lines
Ekren Nazmi,Karagöz Zehra,Şahin Mustafa 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.4
Inspection and maintenance of power transmission lines are crucial in terms of providing uninterrupted power for the consumers. Inspection and maintenance of transmission lines passing through areas that are diffi cult to reach and pass through are usually carried out by workers or with the help of helicopter. These methods are not eff ective in terms of time, energy, safety, economy, and effi ciency. Transmission line inspection robots can perform this task safely, effi ciently, economically, quickly with the least risk. In this study, theoretical and experimental studies on line suspended power transmission line inspection robots in the literature are examined. Details of robots with diff erent mechanisms are presented. Robots, which perform the line inspection process with the help of cameras and sensors, can also overcome various obstacles on the line. Produced robot prototypes have been tested in the fi eld and laboratory environment. In this paper, these robots are grouped as those that move on live lines and ground wires. In addition, the advantages and disadvantages of robots have been determined depending on the line they move. Looking at the studies in the literature, it can be said that the inspection of power transmission lines with the help of robots is the most appropriate method compared to traditional methods.
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