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RISS 인기검색어
- 검색키워드
- 저자 : Kuan-Hong Lin (검색결과 5 건)
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Microstructures of W-Mo-Ni-Fe Heavy Alloys
Lin Kuan-Hong,Hsu Chen-Siang,Lin Shun-Tian 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Tungsten heavy alloys with different ratios of Mo and Ni-Fe matrix were liquid-phase-sintered to investigate their microstructural evolution. Results indicated that increased Mo in the alloy promoted the formation of a (W,Mo)(Ni,Fe) type intermetallic compound in the furnace-cooled condition. It was a monoeutectic reaction when the added Mo content was higher than 49at.%, or a eutectic reaction when this value was between 37at,% to 49at.%. When Mo was added between 25at.% to 37at.%, the precipitation of the intermetallic compound took place by either a eutectoid or peritectoid reaction.
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Kuan-Hong Lin,Yuo-Tern Tsai,Ke-Lun Wang 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.1
This study investigated the effects of nano aluminum nitride (AlN) on the microstructure and mechanical properties of vitrifiedbond diamond tools. Raman spectra analysis indicated that added nano AlN helped to protect the diamond crystal structureduring sintering. The diffraction peaks of diamond, AlN, Al2O3, and a few of SiO2 crystal were observed in the X-raydiffraction analysis. However, a lower sintering temperature of 690 oC in this study decreased the formation of Al2O3 and α-SiO2 phases. Scanning electron microscope images showed that addition of 10 vol% nano AlN into the specimen provided anappropriate wetting and bonding between the diamond grits and the matrix, thus producing the highest grinding ratio (24.1)of the tools and the best workpiece surface roughness. The added amount of nano AlN higher than 20 vol% would trigger gaseruption from the matrix during the sintering process, which produced a larger number of pores and caused the vitrifiedmatrix expansion. The deteriorated microstructure decreased the mechanical properties of vitrified bond diamond tools.
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Chang-Lun Liao,Kuan-Hong Lin,Shun-Tian Lin 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.6
The microstructures and dielectric properties of Ba0.88(Nd1.40Bi0.42La0.30)Ti4O12/ alkali-borosilicate glass composites were investigated in this study, with the volume percentage of the glass phase in the composite being either 50, 55, or 60 vol.%. Sintered density measurements indicated that the density increased with an increase in the sintering temperature for the composites with 50 and 55 vol.% glass additions, but, at a sintering temperature higher than 800 oC, the density decreased for the composite with a 60 vol.% glass addition. XRD patterns revealed that the peak of the highest intensity in the B(NBL)T crystal belongs to the (401) crystal plane, while that in the B(NBL)T/glass composites to the (320) crystal plane. Along with the change in crystalline preferred orientation, the lattice constants of the crystal also changed. SEM micrographs indicated that the B(NBL)T phase developed into columnar grains at sintering temperatures higher than 1260 oC. Moreover, when glass was added, the grain morphology changed, especially at sintering temperatures higher than 850 oC. When sintered at 950 oC for 2 hours, the composite with 55 vol.% glass yielded the highest dielectric constant (εr= 23.2), the lowest dielectric loss (tanδ = 4.1 × 10-3), and a high Q×f value (Q × f = 1,620 GHz, Q = 1/tanδ, f = 6.67 GHz). The microstructures and dielectric properties of Ba0.88(Nd1.40Bi0.42La0.30)Ti4O12/ alkali-borosilicate glass composites were investigated in this study, with the volume percentage of the glass phase in the composite being either 50, 55, or 60 vol.%. Sintered density measurements indicated that the density increased with an increase in the sintering temperature for the composites with 50 and 55 vol.% glass additions, but, at a sintering temperature higher than 800 oC, the density decreased for the composite with a 60 vol.% glass addition. XRD patterns revealed that the peak of the highest intensity in the B(NBL)T crystal belongs to the (401) crystal plane, while that in the B(NBL)T/glass composites to the (320) crystal plane. Along with the change in crystalline preferred orientation, the lattice constants of the crystal also changed. SEM micrographs indicated that the B(NBL)T phase developed into columnar grains at sintering temperatures higher than 1260 oC. Moreover, when glass was added, the grain morphology changed, especially at sintering temperatures higher than 850 oC. When sintered at 950 oC for 2 hours, the composite with 55 vol.% glass yielded the highest dielectric constant (εr= 23.2), the lowest dielectric loss (tanδ = 4.1 × 10-3), and a high Q×f value (Q × f = 1,620 GHz, Q = 1/tanδ, f = 6.67 GHz).
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Ying-Ni Luo,Yuo-Tern Tsai,Kuan-Hong Lin 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.10
The cathode of a lithium-ion secondary battery was fabricated using lithium iron phosphate blended with nano carbon black. The effects of four kinds of carbon black on lithium iron phosphate were evaluated by irreversible capacity loss and cyclingperformance. Analyses results show that the specimen 1B had the lowest irreversible capacity loss at charge-discharge cyclingrate 1C among all of the specimens to which 1 wt.% carbon black was added. All of the specimens had a lower chargedischargecapacity at cycling rate 1C and a higher charge-discharge capacity at cycling rate C/2. Cycling performance testresults indicated that the specimen 1B had the highest discharge-capacity and the lowest fade rate.
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Han-Chun Hung,Chien-Wei Feng,Yen-You Lin,Chun-Hong Chen,Kuan-Hao Tsui,Wu-Fu Chen,Chieh-Yu Pa,Jyh-Horng Sheu,Chun-Sung Sung,Zhi-Hong Wen 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-
Atopic dermatitis (AD) is a chronic inflammatory skin disease, and its prevalence is increasing. AD usually elicits skin barrier dysfunction, dry skin and itching. As the mechanisms of AD remain unknown, there is an urgent need to find effective therapies. Because of the diversity and complexity of marine environments, the discovery of drugs from marine organisms as novel therapeutic agents for human diseases has seen renewed interest. Dihydroaustrasulfone alcohol (WA-25), the synthetic precursor of austrasulfone, which is a natural product isolated from a Formosan soft coral, has been shown to possess many therapeutic effects in our previous studies. However, the detailed mechanisms and therapeutic effects of WA-25 on AD are incompletely understood. We performed in vitro and in vivo studies to examine the effects of WA-25 on AD. We showed that WA-25 blocks inflammation and oxidative stress. Simultaneously, we also found that WA-25 reduces the AD scores and AD-induced transepidermal water loss (TEWL), scratching behavior, and alloknesis. WA-25 is more effective in cases of AD than are the drugs that are currently used clinically. Importantly, we also found that when nucleophosmin (NPM) was inhibited or when its expression was reduced, the anti-inflammatory and anti-AD effects of WA-25 were blocked. These data suggest that NPM plays dual roles in inflammation and AD. Overall, these results suggest that WA-25 is a potential anti-inflammatory and AD therapeutic agent that is modulated by NPM.
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