• 한국광학회지
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• 제13권2호
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• pp.123-127
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• 2002

본 연구에서는 1550nm 영역에서 $^{13}$C$_2$H$_2$분자의 회전-진동 모드에 대한 분광을 수행하고, 각 전이선들에 대한 파장을 측정하였다. 파장 측정을 위해서 각 흡수선의 피크에서 레이저주파수 변조를 시켜, 변조신호의 1차 하모닉 록킹법으로 레이저의 주파수를 안정화시키고, 광주파수 표준기로 사용되고 있는 요오드 안정화 헬륨-네온 레이저(KRISS-R70l)로 교정한 파장계를 사용하여 3$\times$$10^{-7}$ 의 정확도로 $^{13}$C$_2$H$_2$의 전이선들의 파장을 측정하였다. 그리고, 아세틸렌 분자 흡수선의 옆선에 주파수 안정화하는 방법을 이용하여 ITU-T 그리드의 절대 파장에 일치하는 표준광원 개발은 제안하였다.

• Nuclear Engineering and Technology
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• 제34권4호
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• pp.323-330
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• 2002

Various types of compounds were tested with the aspects of decomposition and formation of residue in a $CO_2$ or 7H$_2$+93$N_2$ atmosphere. The evaporation temperature range of each compound was determined from thermogravimetric curve. Decomposition of dicarbon amide, stearic acid, acrowax and zinc stearate was studied by thermogravimetry in $CO_2$ or in 7H$_2$+93$N_2$ atmosphere. All compounds were decomposed in $CO_2$ atmosphere at lower than 40$0^{\circ}C$, but the residue, ZnO remained for zinc stearate. ZnO did not decompose in $CO_2$ atmosphere up to 130$0^{\circ}C$, but reduced into Zn metal and disappeared in the temperature range of $600^{\circ}C$ to 120$0^{\circ}C$ in 7H$_2$+93$N_2$ atmosphere. The effect of residue, which trapped in closed pores of sintered pellet, on the thermal stability was studied using the resintering test at 1$700^{\circ}C$ in 7H$_2$+93$N_2$ atmosphere. In the case of oxidative sintered pellet with admixing zinc stearate, the cavity formation accompanied with a density drop after resintering is due to the pressure of the Zn gases trapped in the isolated pores.

• 한국세라믹학회지
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• 제40권3호
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• pp.279-285
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• 2003

Sol-gel 법으로 200 nm 정도의 두께를 가진 강유전성 S $r_{0.9}$B $i_{2.1}$T $a_{1.8}$ N $b_{0.2}$ 박막을 Pt/Ti $O_2$/ $SiO_2$/Si 기판 위에 증착하였다. 본 실험에서는 Sr(O $C_2$ $H_{5}$)$_2$, Bi(TMHD)$_3$, Ta(O $C_2$ $H_{5}$)$_{5}$ 그리고, Nb(O $C_2$ $H_{5}$)$_{5}$를 출발 물질로 사용하였으며 2-methoxyethanol을 용매로 사용하였다. UV 노광과 급속열처리가 SBTN 박막의 구조와 전기적 특성에 어떤 영향을 주는 가를 연구하였다. UV 노광과 급속열처리를 한 후에 $650^{\circ}C$ 열처리한 SBTN 박막의 3V와 5V 인가 전압하에서의 잔류분극 값은 각각 8.49와 11.94 $\mu$C/$ extrm{cm}^2$이었다.

• 한국방사선학회논문지
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• 제14권2호
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• pp.85-95
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• 2020

본 논문에서는 고에너지 엑스선(6MV X선)을 조사한 세뇨관의 세포막 모델에서 오줌의 원료구성성분인 포도당 수용액(H₂O-C₆H₁₂O₆)의 압력차에 따른 여과작용특성에 대하여 연구하였다. 이 실험에 사용한 세포막 모델은 polysulfone 지지막에다가 m-phenylene-diamine(MPD)과 trimesoyl chloride(TMC)- hexane을 계면중합으로 만들어진 여과성 고분자 복합막을 사용하였다. 0.5 wt% TMC- hexane 용액으로 만들어진 여과성막(CM-2)은 0.5 wt% TMC- hexane 용액으로 만들어진 여과성막(CM-1)보다도 총 부피투과플럭스(Jv)와 배제계수(R)가 매우 높다. 압력차(1.5~4MPa)와 36.5℃에서 방사선을 조사한 세뇨관의 고분자 막(세포막모델)은 포도당수용액(H₂O-C₆H₁₂O₆)에서 총 부피투과플럭스(Jv)와 배제계수(R)가 비 조사된 세포막모델보다 각각 약 2 ~ 13배, 4 ~ 6배 정도 감소되었다. 세포막모델에서 포도당수용액(H₂O-C₆H₁₂O₆)의 농도가 증가하면 배제계수(R)가 증가하고 총 부피투과플럭스(Jv)는 감소하였다. 결국 방사선조사로 인해서 세뇨관의 세포막에서 포도당수용액(H₂O-C₆H₁₂O₆)의 여과기능이 비정상적으로 되어 세포장해가 발생하게 되었다고 사료됐다.

• Advances in materials Research
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• 제6권3호
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• pp.303-316
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• 2017

In this article, novel olefin polymerization catalyst with lower cost and simple synthetic process were developed, $ArOTiCl_3$ complexes [$(2-OMeC_6H_4O)TiCl_3(C1)$, $(2,4-Me_2C_6H_3O)TiCl_3(C2)$, $TiCl_3(1,4-OC_6H_4O)TiCl_3(C3)$, $TiCl_3(1,4-OC_6H_2O-Me_2-2,5)$ $TiCl_3(C4)$] and corresponding $(ArO)_2TiCl_2$ complexes [$TiCl_2(OC_6H_4-OMe-2)_2(C5)$ and $TiCl_2(OC_6H_3-Me_2-2,6)_2(C6)$] have been synthesized by the reaction of $TiCl_4$ with phenol, all these complexes were well characterized with $^1H$ NMR, $^{13}C$ NMR, MASS and EA. When combined with methylaluminoxane (MAO), the $ArOTiCl_3/MAO$ system shows high activity for ethylene copolymerization with 1-octene and copolymer was obtained with broaden molecular weight distribution (MWD). The $^{13}C$ NMR result of polymer indicates that the 1-octene incorporation in polymer reached up to 8.29 mol%. The effects of polymerization temperature, concentration of polymerization monomer and polymerization time on the catalytic activity have been investigated.

• 미생물학회지
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• 제29권6호
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• pp.408-415
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• 1991

TOL plsmid size of Flavobacterium odoratum SUB53 was estimated as 83 Md and the optimum concentration of m-toluate degradation by TOL plasmid was 5 mM. $H_{2}$ production by Rhodopseudomonas sphaeroides KCTC1425 was largely dependent on nitrogenase activity and showed the highest at 30 mM malate with 7 mM glutamate as nitrogen source. Nitrogenase activities were inhibited by 0.3 mM $NH_{4}^{+}$ions, to be appeared the decrease of $H_{2}$ production. Conjugation of TOL plasmids from F. odoratum SUB53 and Pseudomonas putida mt-2 to R. sphaeroides showed the optimum at the exponential stage of recipient cells in presence of helper plasmid pRK2013. According to the investigation of catechol-1,2-oxygenase (C-1, 2-O) and catechol-2,3-oxygenase (C-2,3-O) activities of R. sphaeroides C1 (TOL SUB53) and C2 (TOL mt-2), the gene for C-2,3-O is located on TOL plasmid and gene for C-1, 2-O on the chromosome of R. sphaeroides. m-Toluate was biodegraded by TOL plasmid in R. sphaeroides C1 and C2, presumably to be produced $H_{2}$ gas from the secondary metabolites of m-toluate.e.

• 한국재료학회지
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• 제18권11호
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• pp.628-633
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• 2008

ZnO nanopowders were synthesized by the sol-gel method using hydrazine reduction, and their gas responses to 6 gases (200 ppm of $C_2H_5OH$, $CH_3COCH_3$, $H_2$, $C_3H_8$, 100 ppm of CO, and 5 ppm of $NO_2$) were measured at $300\;{\sim}\;400^{\circ}C$. The prepared ZnO nanopowders showed high gas responses to $C_2H_5OH$ and $CH_3COCH_3$ at $400^{\circ}C$. The sensing materials prepared at the compositions of [$ZnCl_2$]:[$N_2H_4$]:[NaOH] = 1:1:1 and 1:2:2 showed particularly high gas responses ($S\;=\;R_a/R_g,\;R_a$ : resistance in air, $R_g$ : resistance in gas) to 200 ppm of $C_2H_5OH$($S\;=\;102.8{\sim}160.7$) and 200 ppm of $CH_3COCH_3$($S\;= 72.6{\sim}166.2$), while they showed low gas responses to $H_2$, $C_3H_8$, CO, and $NO_2$. The reason for high sensitivity to these 2 gases was discussed in relation to the reaction mechanism, oxidation state, surface area, and particle morphology of the sensing materials.

• 한국세라믹학회지
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• 제23권3호
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• pp.53-61
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• 1986

A gas sensor which has been made by wet process had fabricated by coating each of the mixture on alumina tube and firing at 85$0^{\circ}C$ for 3hrs. A gas concentration such $H_2$, CO, $C_3H_8$, $C_2H_2$ and $CH_4$ vs its detection voltage characteristics has been in-vestigated on $SnO_2-In_2O_3-MgO$ system doped with PdO, $La_2O_3$, $ThO_2$, NiO and $Nb_2O_5$ The optimum sensitivity composition for various gases were 90w/o $SnO_2$-9w/o $In_2O_3$-1w/o MgO for $H_2$, $C_2H_2$ CO and $C_3H_8$ and 95w/o $SnO_2$-4w/o $In_2O_3$-1w/o MgO for $CH_4$. The sample which has been made by wet process than dry process had predominated sensitivity for each gases and particle size of the sample coprecipitated with PH=9 was 0.1${\mu}{\textrm}{m}$ The $SnO_2$-In2_O_3-MgO$ system doped with 2w/o $Nb_2O_5$ and NiO was the most sensitive for $H_2$ and $C_2H_2$ gas. In $SnO_2$-In2_O_3-MgO$ system doped with $ThO_2$ the sensitivity of $H_2$ gas was decreased but CO gas was in-creased when dopant con was increased.

• 대한화학회지
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• 제38권2호
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• pp.169-173
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• 1994

인도네시아 Manado만의 Sulawesi에서 채집한 미동정된 해면으로부터 KB cancer cell line에 대해 활성을 갖는 xestoquinone, halenaquinol sulfate 및 halenaquinol이 검출되었다. 이들을 $^1H-,\;^{13}C$-NMR, $^1H-,\;^{13}C$(1 bond) heteronuclear Multiple Quantum Cogerence Spectroscopy$(HMQC)^1$, $^1H-,\;^{13}C$C(2 and 3 bond) Heteronuclear multiple Bond Correlation Spectroscopy$(HMBC)^2$, Electron Impact Mass Spectroscopy(EI ms), UV 및 IR에 의해 밝혔다.

• 한국컴퓨터산업학회논문지
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• 제3권12호
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• pp.1747-1758
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• 2002

실리콘 젤의 경화조건에 따른 전기적 특성을 조사하기 위하여 절연파괴특성에 대한 실험을 실시하였다. 실험을 위해 온도 100[$^{\circ}C$], 125[$^{\circ}C$], 150[$^{\circ}C$], 160[$^{\circ}C$], 170[$^{\circ}C$], 180[$^{\circ}C$]에서 각각 30[Min], 1[H], 2[H]동안 경화된 여러 시료를 제작하였다. 절연파괴실험에서 사용된 전극의 재료는 순도 99.9[%]의 구리이며, 전극간 간격은 1~3[mm]로 하였고, 전극의 두께는 0.2[mm]이다. 실험결과 온도 170[$^{\circ}C$]에서 2[H] 경화된 시료의 전기적 특성이 가장 우수하였다.