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陰理鉉,金泳錫 崇田大學校 1977 論文集 Vol.7 No.1
This study has been conducted to develop superior racket gut of hard tennis. The results of this study may be summarized as follows: 1) The superior solvent to adhesive nylon filaments is phenol, and the suitable solution for racket gut of hard tennis is phenol 85%, methanol 15%. 2) The suitable twisting number is 2.30 per inch at 1st twisting and 2nd twisting. in case center filament; diameter..........0.82mm filament number...mono filament outer filament; diameter..........0.16mm filament number...18 filaments at 1st twisting 24 filaments at 2nd twisting 3) In waxing process, paraffin waxing is superior to improve the characteristics of tensile strength and elongation, elasticity and abrasion resistance for racket gut of hard tennis, and the suitable solution is paraffin 50%, petroleum 50%. 4) In curing process, it is effective to treat for 5 to 6 minutes at 160℃ or for 8 minutes at 140℃ to improve above characteristics for racket gut of hard tennis.
형기성,서인아,이현복,유찬민,지상범,음인권 한국해양과학기술원 2018 Ocean science journal Vol.53 No.2
Radionuclide activities of 210Pb and 226Ra were measured to determine bioturbation coefficients (Db) in seven sediment cores from the Korean licensed block for polymetallic nodules in the Clarion–Clipperton Fracture Zone. Variability in Db is considered in the context of the sedimentological, geochemical, and geotechnical properties of the sediments. Db values in the studied cores were estimated using a steady-state diffusion model and varied over a wide range from 1.1 to 293 cm2/yr with corresponding mixing depths (L) of 26 to 144 cm. When excepting for spurious results obtained from cores where diffusive mixing does not apply, Db values range from 1.1 to 9.0 cm2/yr with corresponding mixing depths (L) of 26 to 63 cm. Such wide variability in Db and L values is exceptional in sites with water depths of ∼5000 m and is attributed in this study to an uneven distribution of sediment layers with different shear strengths and total organic carbon (TOC) contents, caused by erosion events. The studied cores can be grouped into two categories based on lithologic associations: layers with high maximum shear strength (MSS) and low TOC content, showing a narrow range of Db values (1.1–9.0 cm2/yr); and layers with low MSS and high TOC content, yielding much higher Db values of over 30 cm2/yr. The distribution of different lithologies, and the resultant spatial variability in MSS and labile organic matter content, controls the presence and maximum burrowing depth of infauna by affecting their mobility and the availability of food. This study provides a unique case showing that shear strength, which relates to the degree of sediment consolidation, might be an important factor in controlling rates of bioturbation and sediment mixing depths.
윤문구,김진우,음이현,Yun, Mun-Gu,Kim, Jin-U,Eum, Lee-Hyeon 한국섬유공학회 1972 한국섬유공학회지 Vol.9 No.1
The adsorption of acid dyes on undrawn and drawn nylon 6 fibers have been investigated. The dyes used are C.I. Acid Orange 7 and C.I. Acid B1ue 113. The saturation of Orange 7 which had small molecular weight and short molecular chain was nearly equal to amino end group content of the undrawn fiber. But the saturation of Blue 113 which had larger molecular weight and two sulphonic acid groups was about 0.7 of amino end group content of the undrawn fiber. The saturation of dye is reduced a little as the draw ratio increases from 1.0 to 3,4.