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장석우(Suk Woo Jang), 최승국(Seung Kook Choi), 박수형(Suhyoung Park), 최학순(Hak Sun Choi), 양은영(Eung Young Yang), 이종남(Jong Nam Lee), 김대균(Dae Gyun Kim), 노재관(Jae Kwan Noh), 김은지(Eun Ji Kim), 정완규(Wan Gyu Jeong), 고순보(Sun Bo Ko) 한국육종학회 2018 한국육종학회지 Vol.50 No.3
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A new red butterhead lettuce (Lactuca sativa L.) with transverse broad elliptic, red leaves, ‘Sun Red Butter', with late bolting and high yield, was developed from a cross between ‘Jajusangchu' (red leaf color and half crisp) and ‘Dukseomjeokchukmyeon' (high yield). The crossing and selection for advanced lines was previously carried out using the pedigree method during the period 2001-2009. The advanced lines were evaluated for yield and adaptability at several locations in Korea (Gangwon-do, Gyeonggi-do, Chungcheongbuk-do, Jeollabuk-do, Gyeongsangnam-do, and Jeju-do) in 2011. The type of matured stage is early and medium butterhead lettuce. The shelf life of ‘Sun Red Butter' was four weeks longer than that of ‘Germania' at 4°C. The anthocyanin content of ‘Sun Red Butter' was lower than that of ‘Germania' at 11.2 mg/100 g. The BSL (latucin+8-deoxylactucin+lactucopicrin) content of ‘Sun Red Butter' was higher than that of ‘Germania' at 32.8 μg/g, DW. The marketable yield of ‘Sun Red Butter' was higher than that of ‘Germania' by 67% (at 621.4 g per plant), and ‘Sun Red Butter' showed a particularly improved yield under high-temperature cultivation in the field. Furthermore, ‘Sun Red Butter' had better taste characteristics and was crisper and sweeter than ‘Germania'. Therefore, we recommend that the new cultivar ‘Sun Red Butter' would be suitable for cultivation in spring and fall. Furthermore, this new cultivar could be harvested in a single harvest, as in a head lettuce, and could therefore be managed more efficiently and economically by farmers.
Objective: The purpose of this study is to investigate the heat treatment conditions to minimize the change of mechanical properties before and after the heat treatment of orthodontic stainless steel round wire with the length of 250 mm diameter of 0.9 mm. Methods: 250 mm long straight tensile test specimens and 30 mm straight bend test specimens were fabricated in stainless steel wire with a diameter of 0.9 mm to meet the respective test conditions. The specimens were annealed at 300°C, 500°C, 700°C and 900°C without heat treatment and mooring at 20°C per minute. specimens before and after heat treatment were subjected to a tensile test and a bend test using a universal testing machine. Results: Analysis of tensile properties proceeded on-way ANOVA. As a result of, there was a significant difference in yield load, yield strength, maximum load tensile strength. There was no significant difference in fracture displacement at 900°C. Analysis of the bending properties was carried out on-way ANOVA. As a result of, the maximum load was 300°C, 500°C and 900°C, and the tensile strengths were significantly different at 500°C and 700°C. There is no significant difference in maximum displacement. Conclusion: In the tensile test fracture displacement was higher when the heat treatment is performed at 300°C than that of the A company specific heat treatment, B, C for the company but the specific heat treatment was higher than 300°C from 500°C heating temperature goes up higher rupture displacement.
The Fe-Si-B-Nb-Cu alloys containing Ca and Al were rapidly solidified to thin ribbons by melt-spinning. The ribbons were ball-milled to make powders, and then mixed with 1 wt.% water glass and 1.5 wt.% lubricant. The mixed powders were burn-off, and then compacted to form toroidal-shaped cores, which were heat treated to crystallize the nano-grain structure and to remove residual stress of material. The characteristics of the powder cores were analyzed using a differential scanning calorimetry (DSC) and a B-H meter. The microstructures were observed using transmission electron microscope (TEM). The optimized soft magnetic properties (μi and Pcv) of the powder cores were obtained from the Ca and Al containing alloys after annealing at 530 °C for 1 h. The core loss of Fe-Si-B-Nb-Cu-based powder cores was reduced by the addition of Ca element, and the initial permeability increased due to the addition of Al element.