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Liquid Phase Adsorption Properties of Organo Surfur Compounds on Cation Exchanged Natural Zeolites
김종택,허남호,Kim, Jong-Taik,Heo, Nam-Ho Korean Chemical Society 1984 대한화학회지 Vol.28 No.3
陽이온 交換한 天然제올라이트에 依한 有機黃化合物의 液相吸着特性을 考察하였다. 平衡吸着量은 天然제올라이트의 交換한 陽이온과 吸着質인 有機黃化合物의 構造에 影響을 받고 있음을 알 수 있었다. 또한 平衡吸着量은 메르캅탄(mercaptane), 설파이드(sulfide), 디설파이드(disulfide), 치오펜(thiopen) 順으로 減小하였으며, 치오펜 誘導體의 경우는 ${\pi}$ 電子가 많아짐에 따라 吸着能은 교환 이온의 polarizing power에 比例하였다. 吸着速度로부터 有機黃化合物의 吸着은 pore 내의 擴散이 律速段階임을 알수 있었고, 水分과 같은 작은 吸着質은 micro pore에 吸着이 일어나는 反面, 有機黃化合物은 transitional-pore에 吸着이 일어났다. The adsorption properties of organo sulfur compounds on cation exchanged natural zeolites from n-heptane were investigated. The equilibrium adsorbed amounts were dependent upon the exchanged cation and the nature of organo sulfur compounds such as length, volume, electronical structure. The increasing orders of equilibrium adsorbed amounts were thiophene derivatives, disulfide, sulfide mercaptane and thiophene, benzothiaphene, dibenzothiophene. And $Co^{+2}$-zeolite was the most prominent adsorbant. Rate determining step of the adsorption at initial stage was intraparticle diffusion into the transitional pores of zeolite. These adsorption rates were dependent upon the bulkiness of adsorbate. Finally, preadsorbed water didn't affect these adsorption until the cation exchanged natural zeolite contained 2.26${\times}10^{-3}$ mol/g of water. It indicated that water preferentially occupied the micro pores of the cation exchanged natural zeolites.
Crystal Structure of Xenon Encapsulate within Na-A Zeolite
임우택,박만,허남호,Im, U Taek,Park, Man,Heo, Nam Ho Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.1
The positions of Xe atoms encapsulated in the molecular-dimensioned cavities of fully dehydrated Na-A have been determined. Na-A was exposed to 1050atm of xenon gas at 400 $^{\circ}C$ for seven days, followed by cooling at pressure to encapsulate Xe atoms. The resulting crystal structure of Na-A(7Xe) (a = 12.249(1) $\AA$, $R_1$ = 0.065, and $R_2$ = 0.066) were determined by single-crystal X-ray diffraction techniques in the cubic space group Pm3m at 21(1) $^{\circ}C$ and 1 atm. In the crystal structure of Na-A(7Xe), seven Xe atoms per unit cell are distributed over four crystallographically distinct positions: one Xe atom at Xe(1) lies at the center of the sodalite unit, two Xe atoms at Xe(4) are found opposite four-rings in the large cavity, and four Xe atoms, two at Xe(2) and others at Xe(3), respectively, occupy positions opposite and between eight- and six-rings in the large cavity. Relatively strong interactions of Xe atoms at Xe(2) and Xe(3) with $Na^+$ ions of four-, eight-, and six-rings are observed:Na(1)-Xe(2) = 3.09(6), Na(2)-Xe(3) = 3.11(2), and Na(3)-Xe(2) = 3.37(8) $\AA$. In each sodalite unit, one Xe atom is located at its center. In each large cavity, six Xe atoms are found, forming a distorted octahedral arrangement with four Xe atoms, at equatorial positions (each two at Xe(2) and Xe(3)) and the other two at axial positions (at Xe(4)). With various reasonable distances and angles, the existence of $(Xe)_6$ cluster is proposed (Xe(2)-Xe(3) = 4.78(6) and 4.94(7), Xe(2)-Xe(4) = 4.71(6) and 5.06(6), Xe(3)-Xe(4) = 4.11(3) and 5.32(4) $\AA$, Xe(2)-Xe(3)-Xe(2) = 93(1), Xe(3)-Xe(2)-Xe(3) = 87(1), Xe(2)-Xe(4)-Xe(2) = 91(4), Xe(2)-Xe(4)-Xe(3) = 55(2), 59(1), 61(1), and 68(1), and Xe(3)-Xe(4)-Xe(3) = 89($^{\circ}1$)). These arrangements of the encapsulated Xe atoms in the large cavity are stabilized by alternating dipoles induced on Xe(2), Xe(3), and Xe(4) by eight- and six-ring $Na^+$ ions as well as four-ring oxygens, respectively.
이봉호,이현,허남호,김진웅,Lee, Bong-Ho,Lee, Hyeon,Heo, Nam-Ho,Kim, Jin-Ung 한국전자통신연구원 2008 전자통신동향분석 Vol.23 No.3
3DTV는 향후 모노스코픽 TV(2DTV)를 대체할 차세대 방송 서비스로 인식되고 있다. 이는 시청자에게 입체감을 제공함으로 인해 기존 모노스코픽 TV에 비해 보다 현장감과 현실감 있는 TV 서비스를 제공할 수 있는 장점이 있다. 전송측면에서 보면 3D 서비스를 위해서는 하나 이상의 시점에서 촬영된 영상이 필요하다. 이를 위해서는 모노스코픽 TV에 비해 전송 용량의 증대를 가져오므로 이를 효율적으로 전송하기 위한 방안이 강구되어야 한다. 본 기고에서는 지상파 방송망과 방송과 통신의 융합 서비스로 불리는 IPTV 망을 연동하여 3D 서비스를 제공하기 위한 전송 방법에 대해 간략하게 소개한다.
광학활성 비스(L-Prolinato)(2,2'-bipyridine)코발트(Ⅲ)와 비스(L-Prolinato)(1,10-phenanthroline)코발트(Ⅲ)의 합성과 구조적인 특성
오창언,김복조,윤두천,도명기,허남호,Oh, Chang Eon,Kim, Bok Jo,Yoon, Doo Cheon,Doh, Myung Ki,Heo, Nam Ho 대한화학회 1995 대한화학회지 Vol.39 No.9
Trans-$[Co(py)_4/Ci_2]^+(py=pyridine)$과 L-proline 및 diimine(=2,2'-bipyridine,1,10-phenanthroline)과의 반응에서 $[Co(L-pro)_2/(bipy)]^+$(L-pro=bipy=2,2'-bipyridine)과 $[Co(L-pro)_2(phen)]^+$(phen=1,10-phenathroline)이 각각 생성되었다. 관 크로마토그래피상에서 입체특이성을 가지는 L-prolinato의 입체선택성으로 인하여 $[Co(L-pro)_2(bipy)]^+$에서는 $Lambda$-trans(N)만이 얻어졌고 $[Co(L-pro)_2(bipy)]^+$에서는 ${\Delta}$-trans(N)과 $Lambda$-cis(O)cis(N)이 얻어졌다. 결정구조 연구의 결과는 다음과 같다: $Lambda$-trans(N)-$[Co(L-pro)_2(bipy)]CIO_4{\cdot}2H_2O$ (1): monoclinic, space group $P2_1(#4)$, a = 9.807(3), b = 10.421(1), c = 12.778(2)${\AA}$, ${\beta}=109.90(2)^{\circ}$, V = 1227.8(5)${\AA}^3$, Z = 2; 1571 data(I>3.0${\sigma}$(I)) R = 0.060 and $R_W = 0.067$; ${\Delta}$-trans(N)-$[Co(L-pro)_2(phen)]Cl{\cdot}_3H_2O$ (2): monoclinic, space group $P2_1(#4)$, a = 9.838(2), b = 12.892(2), c = 10.747(2)${\AA}$, ${\beta}=113.79(2)^{\circ}$, V = 1247.2(4)${\AA}^3$, Z = 2; 2433 data(I>3.0${\sigma}$(I)) R = 0.043 and $R_W = 0.050$. Reaction between trans-$[Co(py)_4/Ci_2]^+(py=pyridine)$ and L-proline and diimine (=2,2'-bipyridine, 1,10-phenanthroline) gives two products, $[Co(L-pro)_2/(bipy)]^+$ and $[Co(L-pro)_2(phen)]^+$ complexes, respectively. On column chromatography, $[Co(L-pro)_2(bipy)]^+$ was obtained only as $Lambda$-trans(N) and $[Co(L-pro)_2(phen)]^+$ was obtained both as ${\Delta}$-trans(N) and $Lambda$-cis(O)cis(N) due to the stereoselectivity of L-prolinato which was stereospecific. Crystal data are as follows: $Lambda$-trans(N)-$[Co(L-pro)_2(bipy)]CIO_4{\cdot}2H_2O$ (1): monoclinic, space group $P2_1(#4)$, a=9.807(3), b=10.421(1), c=12.778(2) ${\AA}$, ${\beta}=109.90(2)^{\circ}$, V=1227.8(5) ${\AA}^3$, Z=2; 1571 data with I > 3.0${\sigma}$(I) were refined to R=0.060, $R_W = 0.067$; ${\Delta}$-trans(N)-$[Co(L-pro)_2(phen)]Cl{\cdot}_3H_2O$(2): monoclinic, space group $P2_1(#4)$, a=9.838(2), b=12.892(2), c=10.747(2)${\AA}$, ${\beta}=113.79(2)^{\circ}$, V=1247.2(4) ${\AA}^3$, Z=2; 2433 data with I > 3.0${\sigma}$(I) were refined to R=0.043, $R_W = 0.050$.