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RISS 인기검색어
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- 저자 : Saruhan (검색결과 3 건)
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Suat Sarıdemir,Hamit Saruhan 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
Designing valve lift of cam-follower system is very important for improving dynamic performance of internal combustion engines. Potentialproblems due to unwanted vibrations in high-speed engine are the follower jump, colliding surface of the valves, and seats whichcause collide in a cam-follower system. The degree of collide depends on the valve lift value and valve closing velocity. Large forces andstresses are introduced when the cam and follower collide. This might cause early failure of the system due to unwanted vibration. Themain purpose of present experimental study was to investigate and analyze the dynamic behavior of the cam-follower system for differentvalve lift values and operating speeds using time domain and frequency domain analysis technique. Two cases for maximum valvelift values of 8 and 10 mm were tested with corresponding operating speeds of 450, 930, 1440, 1950 and 2430 rpm. From the results, itwas observed that the higher the operating speed, the higher amplitude values were obtained. Statistical analysis of obtained data showedthat the 10 mm valve lift produced much more power than the 8 mm valve lift.
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Deflections of reinforced concrete beams with transverse openings of different geometries
Ilker Kalkan,Ece Ceylan,Saruhan Kartal,Mehmet Baran 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.3
The present study pertains to the in-plane bending deflections of reinforced concrete beams with multiple regular transverse openings along the beam length. The total deflections in the beam were obtained from bending deflections and the additional deflections from the Vierendeel panel action. The accuracy of the deflection estimates from the proposed formula were observed to depend on the opening geometry. Among different geometries, the presence of rectangular and parallelogram web openings resulted in the experimental deflections to deviate more considerably from the analytical values due to the stress concentrations around the corners of the openings. Consequently, a multiplier was incorporated into the deflection formula to account for the opening geometry. The new revised formula was found to generate analytical load-deflection curves in close agreement with the experimental ones and service-load deflections close to the FEA values of beams with varying amount of tension reinforcement. The diagonal reinforcement around the openings and the short stirrups in the posts and chords increased the accuracy of the analytical deflection estimates by reducing the undesired additional deformations in the beam due to the poorer integrity of the posts and chords around the openings.
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Aykut Saglam,Ebru Kalaycioglu,Funda Gul Guven,Neslihan Saruhan,Asım Kadioglu,Mehmet Demiralay 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.4
Reducing effects of exogenous hydrogen peroxide on leaf rolling in detached leaves of Ctenanthe setosawere studied. The leaves were kept in H2O2 solutions ranging from 0 to 1 mM for 48 h and then, osmotic stresswas applied for 4 h by polyethylene glycol (PEG). Degree of leaf rolling, loss of leaf water, and malondialdehyde(MDA) content were reduced by 0.2 mM H2O2. Antioxidant enzymes were induced by 0.2 mM H2O2. EndogenousH2O2 content was increased after the 0.5 and 1 mM H2O2 treatments but was decreased after 0.2 mM H2O2 treatment. Proline was decreased after exogenous H2O2 applications. Total soluble sugar content was increased as compared tothe control after 0.2 mM H2O2 treatment. In conclusion, low-dose exogenous H2O2 treatment could delay leaf rollingby inducing tolerance to osmotic stress due to modulation of the antioxidant system, soluble sugar accumulation, andmaintenance of leaf hydration. Therefore, postharvest life of C. setosa cut foliage could be extended by 0.2 mMH2O2 treatments.
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