• Title/Summary/Keyword: Processing characterstics

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A study on the hardening characterstics of the TiC layer formed by the reactive deposition technique (반응석출법에 의해 피복된 TiC의 경화거동에 관한 연구)

  • Nam, K.S.;Byon, E.S.;Lee, G.H.;Kim, D.H.
    • Journal of the Korean Society for Heat Treatment
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    • v.7 no.4
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    • pp.288-297
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    • 1994
  • In this study, lattice parameter, binding energy and microstructures of TiC layer according to the addition of Fe, Cr were investigated in the reactive deposition coating. From the results, the lattice parameters of the TiC layers by using ferro-titanium as a precursor were 4.329~4.339A but the lattice parameters of the TiC layers formed by ferro-titanium and ferro-chromium decreased to 4.316~4.330A. The hardness of the former's was HV(100g) 3,000~3,400kg/mm and the hardness of the latter's was HV (100g) 3,800~3,900. But, regardless of Cr and Fe, the binding energy of TiC layers were 454.75 eV for $Ti2p_{3/2}$ and were 281.85 eV for Cls. Meanwhile, the TiC layers were densified by addition of Fe, Cr and internal defects were reduced Therefore. it can be concluded that the remarkable hardness increment was obtained by the improvement of microstructures of TiC rather than the increase of bond strength or Peierls stress.

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Fabrication and Characteristics of $UO_{2+x}$ Powder by a Dry Conversion Process (건식 변환 공정에 의한 $UO_{2+x}$ 분말 제조 및 특성)

  • An, Chang-Mo;Kim, Chang-Gyu;Lee, Jong-Yong;Song, Gi-Yeong;Lee, Beom-Jae
    • Korean Journal of Materials Research
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    • v.10 no.2
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    • pp.166-170
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    • 2000
  • Nuclear fuel $UO_{2+x}$ power was produced from concentrated $UF_6$ by the DCP(Dry Conversion Process). The characterstics of $UO_{2+x}$ powder, prepared with respect to steam flowing conditions and temperature variations in a rotary kiln reactor, have been investigated with a uranium analyzer, water vapor measurement, and SEM. Fluorine content of the powder could be reduced to 8ppm. The moisture content was found to be optimized.

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Anti-allergic Effects of Castanea crenata Leaf Tea (밤나무 잎차(茶)의 항알레르기 효과)

  • Choi, Ok-Beom;Kim, Kyung-Man;Yoo, Gyurng-Soo;Park, Keun-Hyung
    • Korean Journal of Food Science and Technology
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    • v.30 no.2
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    • pp.468-471
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    • 1998
  • Regarding the characterstics of allergic diseases, preventive and continuous treatment is desirable, and tea would be the one of the best functional food formula for it. Here we report the development of tea processing method for the leaves of Castnaea crenata. Two forms of Castnaea crenata leaf tea were prepared, non-fermented steaming tea and semi-fermented rolling tea. Anti-allergic actions of Castanea crenata leaf tea were asessed by testing their effects on the degranulation of mast cells. For this, hexosaminidase release (degranulation marker) from RBL-2H3 cells (mast cell line) was used. At the concentration of $300\;{\mu}g/mL$ of the water extract, the degranulation of RBL-2H3 cells were inhibited 50.4% and 35.4% by non-fermented steaming tea and semi-fermented rolling tea, respectively. These results suggest that the tea processing method we developed could provide a valuable resource for the treatment of allergic diseases.

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A Study on the Performance improvement of TEA adaptive equalizer using Precoding (사전 부호화를 이용한 TEA 적응 등화기의 성능 개선에 관한 연구)

  • Lim Seung-Gag
    • The KIPS Transactions:PartC
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    • v.13C no.3 s.106
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    • pp.369-374
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    • 2006
  • This paper related with the performance improvement of adaptive equalizer that is a based on the tricepstrum eqalization algorithm by using the received signal. Adaptive equalizer used for the improvement of communication performance, like as high speed, maintain of synchronization, BER, at the receive side in the environment of communication channel of the presence of the aditive noise, phase distortion and frequency selective fading, mainly. It's characteristics are nearly same as the inverse characterstics of the communication channel. In this paper, the TEA algorithm using the HOS and the 16-QAM which is 2-dimensional signaling method for being considered signal was used. For the precoding of 16-QAM singnal in the assignment of the signal costellation, Gray code was used, and the improvement of performance was gained by computer simulation in the residual intersymbol interence and mean squared error which is representive measurement of adaptive equalizer.

11S and 7S Globulin Fractions in Soybean Seed and Soycurd Characteristics (콩 종실 단백질 분획(7S, 11S)과 두부특성)

  • Kim, Yong-Ho;Kim, Seok-Dong;Hong, Eun-Hi
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.39 no.4
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    • pp.348-352
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    • 1994
  • Soybean seed consists of two major storage protein, the 7S and 11S globulins. For improving the quality of soybean seed protein, an increase of 11S/7S ratio would be a desirable objective because the 11S globulin contains much more the sulfur-containing amino acids than the 7S globulin. In this study, some soybean varieties were used to investigate the analyzing method for 7S and 11S globulins. 7S and 11S globulins couble be fractionated by their different solubilities in tris buffers. Adjusting the pH and tris concentration were major factors affecting the precipitation of the two globulins. And it was possible to screen the soybean genotypes having aberrant subunit compositions of the two globulins by an sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) of total soybean proteins. The ratio of 11S to 7S globulin ranged from 1.29 to 1.38. This paper also dealed with the contribution of protein components in soybean seeds to the physical properties of soycurd. It indicated that the soycurd from crude 11S was remarkably harder than that from crude 7S, and springiness and cohesiveness were slightly higher in soycurd having higher proportion of 11S. So, it may concluded that proportion of protein components in soybean seed can be important factor which controls the suitability for soycurd or other foods.

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