• Title/Summary/Keyword: $B_{18}$

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The Effect of Additive Co on the Magnetic Properties of Fe3B/Nd2Fe14B Magnets

  • Yang, Choong-Jin;Park, Eoun-Byung;Hwang, Yong-Soon;Kim, Eng-Chan
    • Journal of Magnetics
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    • v.4 no.2
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    • pp.60-64
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    • 1999
  • The addition of Co into $Nd_4Fe_{77.5-x}Co_x(HfGa)_yB_{18.5}(0$\leq$x$\leq$5, y=0, 0.5)4 was found to enhance the magnetic properties of $Fe_3B/Nd_2Fe_{14}B$ nanocomposite magnets. The enhancement resulted from the fact that Co retarded the crystallization of $\alpha$-Fe or Fe3B but accelerated that $Nd_2Fe_{14}B$. The decreased interval between the onset of crystallization temperature of Fe3B and $Nd_2Fe_{14}B$. phases enabled the grain growth of each phase to be uniform dufing a post annealing of the melt spun ribbons. The addition of 3~5 at. % Co into ternary composition $Md_4Fe_{77.5}B_{18.5}$ increased the coercivity (iHc) from 3.27 to 3.54 kOe with the enhanced remanence value (4$\pi$Mr) around 11.54 kG. From the ribbon magnets of Nd4Fe71.5Co5Hf0.5B18.5 made at 26 m/sec and annealed at 68$0^{\circ}C$ for 10 min, the magnetic properties of Br=11.54 kG, iHc=3.54 kOe, and (BH)max=14.35 MGOe were obtained from volume production line.

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NITRIC OXIDE PRODUCTION BY 18$\beta$-GLYCYRRHETINIC ACID VIA NUCLEAR FACTOR-$\textsc{k}$B ACTIVATION IN MACROPHAGES

  • Kim, Ji-Young;You, Ho-Jin;Jeong, Hye-Gwang
    • Proceedings of the Korean Society of Toxicology Conference
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    • 2002.05a
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    • pp.86-86
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    • 2002
  • Glycyrrhizin, a triterpenoid saponin fraction of licorice, is reported to have anti-viral and anti-tumor activities and is metabolized to 18$\beta$-glycyrrhetinic acid (GA) in the intestine by intestinal bacteria. However, the mechanism underlying its effects is poorly understood.(omitted)

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8B/10B Encoder Design by Coding Table Reduction (코딩테이블 축소방법에 의한 8B/10B 인코더 설계)

  • Shin, Beom-Seok;Kim, Yong-Woo;Yoon, Kwang-Sub;Kang, Jin-Ku
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.45 no.4
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    • pp.43-48
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    • 2008
  • This paper presents a design of 8B/10B encoder by the coding table reduction. The proposed encoder has reduced coding table modified disparity control block. Logic simulation and synthesis have been done for the proposed design. After synthesized using Magna CMOS $0.18{\mu}m$ process, the proposed design achieved the operating frequency of 343MHz and chip area of $1886{\mu}m^2$.

Removal of Rhodamine B in Water by Ultraviolet Radiation Combined with Electrolysis(II) (전기분해와 UV 조사에 의한 수중 Rhodamine B의 제거(II))

  • Kim, Dong-Seog;Park, Young-Seek
    • Journal of Environmental Science International
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    • v.18 no.6
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    • pp.667-674
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    • 2009
  • This study has carried out to evaluate the effect of NaCI as electrolyte of single (electrolysis and UV process) and complex (electrolysis/UV) processes for the purpose of removal and mineralization of Rhodamine B (RhB) dye in water. It also evaluated the synergetic effect on the combination of electrolysis and UV process. The experimental results showed that RhB removal of UV process was decreased with increase of NaCl, while RhB removal of electrolysis and electrolysis/UV process was increased with increase of NaCI. The decolorization rate of the RhB solution in every process was more rapid than the mineralization rate identified by COD removal. The latter took longer time for further oxidation. Absorption spectra of an aqueous solution containing RhB showed a continued diminution of the RhB concentration in the bulk solution: concomitantly, no new absorption peaks appeared. This confirmed the decolorization of RhB, i.e., the breakup of the chromophores. It was observed that RhB removal in electrolysis/UV process is similar to the sum of the UV and electrolysis. However, it was found that the COD of RhB could be degraded more efficiently by the electrolysis/UV process than the sum of the two individual process. A synergetic effect was demonstrated in electrolysis/UV process.

Effect of Individual Fatty Acids on Synthesis and Secretion of Apolipoprotein and Lipoprotein in hep-G2 Cells

  • Ryowon Choue
    • Journal of Nutrition and Health
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    • v.27 no.9
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    • pp.910-923
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    • 1994
  • The effects of individual fatty acids, differing in their degree of unsaturation(18:0, 18:1, 18:2 and 18:3) on the biosynthesis and secretion and lipids were investigated in Hep-G2 cells. Synthesis of apolipoprotein was measured by the incorporation of 3H-leucine into apolipoprotein(d<1.21g/ml) and synthesis of lipids was measured by the incorporation of 3H-glycerol and 14C-acetate into various lipid classes. Inclusion of 1.0mM of each fatty acids into the culture medium significantly increased the synthesis of total apolipoprotein and Apo B(p<0.05). However, addition of fatty acid did not affect the synthesis of cellular and medium protein. Among different fatty acids tested, oleic acid had the greatest effect on Apo B synthesis. While stearic, linoleic and linolenic acid, all had similar effects. The secretion of triglyceride into the medium markedly increased in all fatty acid groups being 5-6 times over the albumin control. The triglyceride secretion was the highest int he oleic acid group. The secretion of phospholipid and cholesterol also increased with triglyceride output. A positive relationship existed between the output of lipoprotein-triglyceride and Apo B. Since the synthesis of Apo B was significantly increased when various fatty acids were included into the culture medium, part of the apparently stimulated synthesis of the apolipoprotein may be in response to the increased formation and secretion of lipoprotein lipids.

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Design and Fabrication of Wideband High Pass Filter Using Left-Handed Transmission Line (LH 전송선을 이용한 광대역 고역통과 필터 설계 및 제작)

  • Yang, Doo-Yeong;Seo, Soo-Duk;Cho, Hak-Rae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.18 no.2
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    • pp.260-267
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    • 2014
  • In this paper, the unit cell of LH structure using microstrip transmission line and chip capacitor is devised, and the reactive components of equivalent circuit are extracted from the proposed unit cell. And then, we have analyzed for the unit cell parameters and applied the characteristics to the wideband high pass filter design. This filter cascading several unit cells with high pass property has been implemented on microstrip transmission line, and the performance has been the band rejection characteristics of 62.9 dB in the stop band to 0~2.18 GHz and less than the insertion loss of 1.17 dB in the pass band from 3.0G Hz to 12.75 GHz.

A 14b 200KS/s $0.87mm^2$ 1.2mW 0.18um CMOS Algorithmic A/D Converter (14b 200KS/s $0.87mm^2$ 1.2mW 0.18um CMOS 알고리즈믹 A/D 변환기)

  • Park, Yong-Hyun;Lee, Kyung-Hoon;Choi, Hee-Cheol;Lee, Seung-Hoon
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.43 no.12 s.354
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    • pp.65-73
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    • 2006
  • This work presents a 14b 200KS/s $0.87mm^2$ 1.2mW 0.18um CMOS algorithmic A/D converter (ADC) for intelligent sensors control systems, battery-powered system applications simultaneously requiring high resolution, low power, and small area. The proposed algorithmic ADC not using a conventional sample-and-hold amplifier employs efficient switched-bias power-reduction techniques in analog circuits, a clock selective sampling-capacitor switching in the multiplying D/A converter, and ultra low-power on-chip current and voltage references to optimize sampling rate, resolution, power consumption, and chip area. The prototype ADC implemented in a 0.18um 1P6M CMOS process shows a measured DNL and INL of maximum 0.98LSB and 15.72LSB, respectively. The ADC demonstrates a maximum SNDR and SFDR of 54dB and 69dB, respectively, and a power consumption of 1.2mW at 200KS/s and 1.8V. The occupied active die area is $0.87mm^2$.

Design and fabrication of the MMIC frequency doubler for 29 GHz local oscillator application (29GHz 국부 발진 신호용 MMIC 주파수 체배기의 설계 및 제작)

  • Kim, Jin-Sung;Lee, Seong-Dae;Lee, Bok-Hyoung;Kim, Sung-Chan;Sul, Woo-Suk;Lim, Byeong-Ok;Kim, Sam-Dong;Park, Hyun-Chang;Park, Hyung-Moo;Rhee, Jin-Koo
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.38 no.11
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    • pp.63-70
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    • 2001
  • We demonstrate the MMIC (monolithic microwave integrated circuit) frequency doublers generating stable and low-cost 29 GHz local oscillator signals from 14.5 GHz input signals. These devices were designed and fabricated by using the M MIC integration process of $0.1\;{\mu}m$ gate-length PHEMTs (pseudomorphic high electron mobility transistors) and passive components. The measurements showed S11 or -9.2 dB at 145 GHz, S22 of -18.6 dG at 29 GHz and a minimum conversion loss of 18.2 dB at 14.5 GHz with an input power or 6 dBm. Fundamental signal of 14.5 GHz were suppressed below 15.2 dBe compared to the second harmonic signal at the output port, and the isolation characteristics of fundamental signal between the input and the output port were maintained above :i0 dB in the frequency range 10.5 GHz to 18.5 GHz. The chip size of the fabricated MMIC frequency doubler is $1.5{\times}2.2\;mm^2$.

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Gene Cloning, Nucleotide Sequence and Efficent Expression of Peptidyl proryl cis-trans Isomerase from Bacillus stearothermophilus (Bacillus stearothermophilus의 Peptidyl Prolyl cis-trans Isomerase 유전자 분리 염기배열 및 발현)

  • 김동주
    • The Korean Journal of Food And Nutrition
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    • v.9 no.4
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    • pp.452-458
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    • 1996
  • A PPIase gene of Bacillus stearothermophilus was screened from a genomic library by plaque hybridization using the A-1 primer as a probe. A PPIase positive plaque contained a 3.0kb insert of the chromosomal DNA. A 3.0kb fragment was subcloned into pUC18, resulting pPI1-40. A DNA fragment encoding the N-terminal portion of the PPIase in pPi-40 was amplified by polymerase chain reaction(PCR) method using the A-1 and B-2 primers. The amplified fragment was cloned into the Sma I site of pUC18 and recombinant plasmid was designated as pSN-18. The nucleotide sequence of 167bp fragment was determined. The deduced amino acid sequence of PPIase was completely matched with the determined N-terminal amino acid sequence of PPIase B. stearothermophilus. The translated protein sequence of PPIase B. stearothermophilus was compared with sequence from periplasmic PPIase from Escherichina coil ; homogies of 16 and 58%, respectively, were found. The clond PPIase gene was over-expressed in E. coil cell using pUC19 as an expression vector. The enzyme was partially purified by heat treatment and colum chromatochraphy on DEAE-Sepharose CL-6B. The molecular weight of the enzyme was dermined to be about 18.0 kDal by SDS-PAGE.

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