• Title, Summary, Keyword: Se transfer

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The Synthesis and Optical Properties of Silica Coated CdSe/ZnS QDs (실리카가 코팅된 양자점의 코팅두께에 따른 광 특성 변화)

  • Lee, Ji-Hye;Shin, Hyun Ho;Lee, Jong-Heun;Hyun, Sang Il;Koo, Eunhae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.3
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    • pp.221-226
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    • 2013
  • The water soluble quantum dots (QDs) are synthesized by the phase transfer and silica coating reaction. The photoluminescence intensity of silica-coated QDs are mainly affected by the amount of phase transfer agent, SDS (sodium dodecyl sulfate), and the maximum value is obtained at the cmc (critical micell concentration) concentration of SDS in the phase transfer reaction. Based on fluorescence spectra and field emission transmission electron microscope (FETEM), the energy transfer rate by forster resonance energy transfer (FRET) is increasing with the thickness of the silica shell coated on CdSe/ZnS QDs.

Effects of Selenium and Vitamin I Administration on Blood Components in Hanwoo Young Bulls (한우 후보종모우에 Selenium과 Vitamin E 투여가 혈액성분에 미치는 영향)

  • 이성수;박노형;원유석;박동헌;김종복;양부근
    • Journal of Embryo Transfer
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    • v.16 no.1
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    • pp.15-27
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    • 2001
  • To identify an antioxidant system, Se and Vit. E were administered into Hanwoo young sire and the effects of administration on blood components(Se, Vit. E, chemical values, estradiol-17 $\beta$, testosterone) were examined. The 16 heads ranging from twenty to thirty two months of age were randomly assigned to control group, Se-administered group(Se-group), Vit. E-administered group(Vit. E-group) and Se and Vit. E administered group(Se and Vit. E-group). Each reagent (Se : 0.1 mg, Vit. E . 1,500IU, Se+vit. E : 0.1 mg+1,500IU per kg of body weight, respectively) administered 3 times every 30days by intramuscular injection. Se concentration in serum was higher in Se-group and Se and Vit. E-group than in control group and Se and Vit. E-group also was higher than Vit. E-group(p<0.05). Although all Se-, Vit. E-administered groups were a little higher than control group, the injection of Se and Vit. E were not significant effect on Vit. E concentration in serum(p>0.05). All groups showed significant variance by periods, but there were not significantly different among groups in blood chemical values. The estradiol-17 $\beta$ concentrations of all Se-, Vit. E-administered groups were a little higher than those of control group, but there were not significant(p>0.05). There have no significant difference among groups in testosterone concentration. These results indicate that the administration of Se, Se + Vit. E increase Se concentration in Hanwoo young bull.

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Three-Dimensional Conjugate Heat Transfer Analysis for Infrared Target Modeling (적외선 표적 모델링을 위한 3차원 복합 열해석 기법 연구)

  • Jang, Hyunsung;Ha, Namkoo;Lee, Seungha;Choi, Taekyu;Kim, Minah
    • Journal of KIISE
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    • v.44 no.4
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    • pp.411-416
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    • 2017
  • The spectral radiance received by an infrared (IR) sensor is mainly influenced by the surface temperature of the target itself. Therefore, the precise temperature prediction is important for generating an IR target image. In this paper, we implement the combined three-dimensional surface temperature prediction module against target attitudes, environments and properties of a material for generating a realistic IR signal. In order to verify the calculated surface temperature, we are using the well-known IR signature analysis software, OKTAL-SE and compare the result with that. In addition, IR signal modeling is performed using the result of the surface temperature through coupling with OKTAL-SE.

Fabrication and characterization of optoelectronic device using CdSe nanocrystal quantum dots/single-walled carbon nanotubes (카드뮴 셀레나이드 양자점과 단일벽 탄소나노튜브로 구성된 이종 나노 소재를 기반으로 한 광전소자의 제작 및 특성평가)

  • Shim, Hyung-Cheoul;Jeong, So-Hee;Han, Chang-Soo;Kim, Soo-Hyun
    • Journal of Sensor Science and Technology
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    • v.19 no.2
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    • pp.160-167
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    • 2010
  • In this paper, we fabricated the optoelectronic device based on Cadmium selenide(CdSe) nanocrystal quantum dots (NQDs)/single-walled carbon nanotubes(SWNTs) heterostructure using dieletrophoretic force. The efficient charge transfer phenomena from CdSe to SWNT make CdSe-Pyridine(py)-SWNT unique heterostructures for novel optoelectronic device. The conductivity of CdSe-py-SWNT was increased when it was exposed at ultra violet(UV) lamp, and varied as a function of wavelength of incident light.

AN EXPERIMENTAL STUDY ON POST-CHF HEAT TRANSFER FOR LOW FLOW OF WATER IN A $3\times3$ ROD BUNDLE

  • MOON SANG-KI;CHUN SE-YOUNG;CHO SEOK;KIM SE-YUN;BAEK WON-PIL
    • Nuclear Engineering and Technology
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    • v.37 no.5
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    • pp.457-468
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    • 2005
  • An experimental study on post-CHF heat transfer has been performed with a $3\times3$ rod bundle using a vertical steam-water two-phase flow at low flow conditions. The effects of various parameters on the post-CHF heat transfer are investigated and the reasons for the parametric effects are discussed. As the heat transfer regime changes from CHF to post-CHF, the radial wall temperature distribution is changed depending on the pressure and the mass flux conditions. The superheat of the fluid increases considerably with an increase of the wall temperature (or heat flux) and with a decrease of the mass flux. This implies, indirectly, a strong thermal non-equilibrium at high wall temperature and low mass flux conditions. In order to improve the prediction accuracy of the existing post-CHF correlations, it is necessary to perform more experiments, particularly direct measurement of the vapor superheat, and to modify the correlation by considering a strong thermal non-equilibrium at low flow and low pressure conditions.

A Study on the Transfer of Letter of Credit in the UCP600 - Focusing on Comparing with Transfer of drawing rights in the ISP98 - (신용장통일규칙(UCP600)상 양도에 관한 연구 - 보증신용장통일규칙(ISP98)과의 비교를 중심으로 -)

  • Park, Se-Hoon;Choi, Young-Joo
    • The Korean Research Institute of International Commerce and Law
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    • v.53
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    • pp.75-97
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    • 2012
  • This study primarily concerns the transfer of letter of credit. A transferable credit is a credit that clearly specifies it is 'transferable' and may be made available in whole or in part to second beneficiary by the request of the first beneficiary. the transfer of the credit is available where the seller as a middleman in intermediate trades purchases from domestic and international supplier. The purpose of this study is to examine the transfer of letter of credit in the UCP600. Having recognized the differences, the study analyzes the transfer of letter of credit under the UCP600 in comparison to those under the ISP98. The ISP98, like the UCP600, stipulates for the requirement of transfer, the number of transfer, conditions of transfer, the replacement of the name of first beneficiary.

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Highly Enantioselective Rh-catalyzed Transfer Hydrogenation of α-Functionalized Arylketones

  • Lee, Do-Min;Kwak, Se-Hun;Lee, Kee-In
    • Bulletin of the Korean Chemical Society
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    • v.30 no.6
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    • pp.1317-1324
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    • 2009
  • Asymmetric transfer hydrogenation of α-functionalized arylketones has been studied. The chiral Rh-catalyst effectively performed in transfer hydrogenation of $\alpha$-mesyloxyketones with an azeotropic mixture of formic acid/triethylamine to produce optically active 1-arylethandiols with excellent enantioselectivity.

Modeling of Surface Temperature Characteristics on the Ground by using the Measured Weather Condition Data (측정된 기상 조건 데이터를 이용한 지상물체의 표면온도 특성 연구)

  • Choi, Jun-Hyuk;Park, Tae-Won;Kim, Tae-Kuk
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.3
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    • pp.470-477
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    • 2010
  • This paper is a part of developing a program that predicts the surface temperature and the IR images of ground objects by considering solar irradiation and atmospheric convection. The thermal modeling is essential for identifying objects on the scenes obtained from the remote sensing. And the temperature distribution on the objects is necessary to obtain their infrared images in contrast to the background. We considered the composite heat transfer modes including conduction, convection and spectral solar radiation incident on the objects within a scene to calculate the surface temperature distribution. The surface temperatures obtained by using the S/W developed in this study(Silhouette) and a commercial S/W(SE-Workbench-IR) are computed and compared each other. Results obtained by using the S/W developed in this study(Silhouette) show fairly good agreement with those obtained by the SE-Workbench-IR.