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이상윤,정인상,유연철 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.7
The annealing behaviour of type 316 stainless steel prestrained with various degrees 10-30%, after solution treatment was investigated by using quantitative metallographic techniques. With increasing degree of prestraining slip bands are heavily formed and their densities gradually decrease as annealing time elapses. Fine M_(23)C_6 type complex carbides are found to precipitate along grain boundaries, slip bands and twin boundaries and to affect the restraint of recrystallized grain boundary movement. The average values of grain size during annealing are shown to increase as prestraining percentage decreases. In particular, grains tend to be coarsened in the case of prestraining of less than 10%. The effects of prestraining on the increase in hardness appear to be considerable as compared to those of annealing temperature, showing that Vickers hardness values increase with increasing prestraining percentage. For a given prestraining condition changes in hardness with respect to grain size are obtained to be in good agreement with the Hall-Petch type relation irrespective of annealing temperature.
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이상윤,정인상,유연철 대한금속재료학회(대한금속학회) 1984 대한금속·재료학회지 Vol.22 No.9
The effect of different levels of cold prestrain on some creep characteristics at 620℃∼650℃ and 200MPa-230MPa of an 316 stainless steel was investigated. The prestrain influences the steady state creep rate and the structure. The steady state creep rate was minimum at 20%-30% prestrain condition. The stress exponent n of secondary creep rate expressed by ε_s=Aσ^n, has been found to range from 7.68 to 7.96 at 620℃ creep and from 5.74 to 6.00 at 650℃ creep. Activation energy for creep in 30% prestrain samples was 97.3㎉/㏖ and in 10% prestrain samples was 87.2㎉/㏖.
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李相潤,李原鎭,金永局 경북대학교 교육대학원 1980 논문집 Vol.12 No.-
Transparents and conductive thin films of CdS and In_2O_3:Sn have been prepared using the simple pyrolitic spray method. The best results were obtained when the substrate temperatures were 450˚∼500℃, and the resistivities of those films were several hundreds of KΩ-㎝∼several tens of MΩ-㎝ for CdS and about 10^-3Ω-㎝ for In_2O_3:Sn.
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이상윤,최민성,마노즈 마닉캄,풀라레디 보꾸,김동현,정상헌 충남대학교 약학대학 의약품개발연구소 2016 藥學論文集 Vol.31 No.-
Chemical shift variations of benzene ring hydrogens along with introduction of amino, acetamido, chlorosulfonyl and aminosulfonyl functional groups in aniline and indoline systems were comparatively analyzed and utilized for determination of stable conformations of acetamido group and chemical shifts for para-disubstituted benzene ring hydrogens. Upon N-acetylation of aniline, chemical shifts of ortho, meta, and para hydrogens are shifted by 0.81, 0.56 and 0.26 downfield from those of aniline. These variations should be incurred by the inductive effect of acetamido group, since the variations are sequentially reduced along with distance from the acetamido function. Indolines upon N-acetylation showed unusual chemical shift variation for 4-, 6-, 7-, and 8-hydrogens (△δ: 0.09, 0.14, 1.47 and 0.24 downfield shift from those of indoline). The remarkably pronounced downfield shift for 7-hydrogen and the unusually small downshifts for 4-and 6-hydrogens of N-acetylindoline compared to those of acetanilide imply the existence of different conformation of acetyl group resulting in the strong electrostatic field effect other than the inductive effect of acetamido group. Although computation of molecular energy of N-acetylindoline around rotation of acetyl group showed two minimum energy conformations, this unusual downfield shift confirms that the real existed conformation of N-acetylindoline is the structure of carbonyl oxygen and hydrogen at 7-position very close. Considering strong electrostatic field effect of N-acetylindoline, acetanilide only possesses the inductive effect, thus conformation of acetamido group in acetanilide should be the structure with carbonyl oxygen of acetamido located away from ortho hydrogens. Therefore the conformation of functional groups must be carefully considered for determination of the chemical shift of benzene ring hydrogens. Chlorosulfonyl and aminosulfonyl group showed chemical shift variation along with the their inductive effect, thus chlorosulfonyl group normally influenced chemical shifts of 4- (△δ: 0.69), 6- (△δ: 0.71) and 7-(△δ: 0.35) hydrogens of indolines from those of N-acetylindoline as shown in aniline system. With these data analysis of indoline system, chemical shifts of hydrogens of symmetrically substituted para-acetamidobenzenzenesulfonyl analogs were obviously determined.
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이상윤,이준범 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.1
The microstructures of drawn, AISI 1006.AISI 1072 carbon steel have been examined by scanning electron microscope. The observations indicate that the cementite plates are aligned to be parallel to the direction, after futher drawing the cementite lamellar appears even more closely aligned paralled to the drawing axis. and a void is developed during drawing, the creation of voids being at ferrite-cementite interface of the free ferrite boundary.
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