• 한국반도체및디스플레이장비학회:학술대회논문집
• /
• 한국반도체및디스플레이장비학회 2005년도 추계 학술대회
• /
• pp.133-136
• /
• 2005

스퍼터링 공정으로 Al이 $2\%$ 함유된 ZnO 박막을 PET에 증착하여 김서림 제거용 투명발열체를 제작하였다. 증착된 투명발열체는 $5\;{\times}\;10^{-3}{\Omega}\;cm$ 의 비저항과 $80\%$ 이상의 가시광 투과도를 나타내었고, 조도는 12.5nm로 양호하였다. 투명발열체의 비저항, 가시광 투과도, 그리고 조도는 각각 Hall 계수 측정장비, IR-VIS-UV spectrophotometer, 그리고 AFM을 이용하여 측정하였다. 증착된 투명발열체에 12V의 전압을 인가하였을 때, 표면의 온도는 평균적으로 1분에 약 $10^{\circ}C$ 증가하였다.

• 한국재난정보학회 논문집
• /
• 제17권2호
• /
• pp.195-205
• /
• 2021

연구목적: 연안건축 재료의 자외선 반사율과 투과율은 건물의 자외선 방출 및 방출의 주요 요인 중 하나이다. 이 연구에서는 건축 자재의 여러 종류의 자외선 스펙트럼 반사율이 측정되었으며 또한 표면 특성 중에 하나인 명도, 거칠기 및 색도와의 관계에 대해서도 검토 및 제안했다. 연구방법: 본 연구에서는 CIE 분류에 의거하여 자외선영역은 단파장 UV-C (10nm~280nm), 중파장 영역 UV-B (280-315 nm), 장파장 영역 UV-A (315-400nm), 가시광선 영역 (400nm~780nm)으로 정했으며, 연속적으로 측정하기 위하여 분광 광도계를 사용했다. 연구결과: 나무의 경우 반사율은 가시광선역 55-68 %, UV-A ^* 7-12 %, UV-B^* 4-5 %로 나타났다. 벽타일은 가시광선역 18-40 %, UV-A^* 8-20 %, UV-B^* 7-8 % 로 나타났으며, 콘크리트는 가사광선역 37 %, UV-A^* 28 %, UV-B^* 19 %로 나타났다. 결론: 가시광선 반사율에 의해 자외선 반사율을 추정 할 수 있으며, 또한 자외선 차단을 할 때에는 용도에 따라 다양한 재료를 선택하는 것이 중요하다.

• Ocean and Polar Research
• /
• 제25권1호
• /
• pp.9-20
• /
• 2003

A solar radiation model was used to investigate the UV radiation at the surface offing Sejong Station in West Antarctica. The results calculated by this model were compared with the values measured by UV-Biometer and UV-A meter during 1999-2000. In this study, the parameterization of solar radiative transfer process was based on Chou and Lee(1996). The total ozone amounts measured by Breve. Ozone Spectrophotometer and the aerosol amounts by Nakajima et al.(1996) was used as the input data of the solar radiative transfer model. And the surface albedo is assumed to be 0.20 in summer and 0.85 in winter. The sensitivity test of solar radiative transfer model was done with the variation of total ozone, aerosol amount, and surface albedo. When the cosine of solar zenith angle is 0.3, Erythemal UV-B radiation decreased 73% with the 200% increase of total ozone from 100 DU to 300 DU, but the decrease of UV-A radiation is about 1%. Also, for the same solar zenith angle, UV-A radiation was decreased 31.0% with the variation of aerosol optical thickness from 0.0 to 0.3 and Erythemal UV-B radiation was decreased only 6.1%. The increase of Erythemal W-B radiation with the variation of surface albedo was twice that of UV-A increase. The surface Erythemal UV-B and UV-A radiation calculated by solar raditive transfer model were compared with the measured values fer the relatively clear day at King Sejong Station in West Antarctica. The model calculated Erythemal UV-B radiation at the surface coincide well with the measured values except for cloudy days. But the difference between the model calculated UV-A radiation and the measured value at the surface was large because of cloud scattering effect. So, the cloud property data is needed to calculate the UV radiation more exactly at King Sejong Station in West Antarctica.

• 공업화학
• /
• 제20권3호
• /
• pp.351-353
• /
• 2009

Pyrylium염 화합물은 양전하를 띄고 있어 유용한 합성반응에 널리 이용되고 있다. 또한 전자를 받아들이는 특성을 갖고 있어 광유도전자전이(PET) 반응의 감광제 등에 응용되고 있다. 우리는 본 연구에서 몇몇 2,6-disubstituted pyrylium fluoroborate 염 화합물을 산성 매체(acetic anhydride/acid) 하에서 합성하였다. 합성한 화합물을 $^{1}H-NMR$, FT-IR과 TOF Mass로 그 구조를 확인하였다. 또한, 그 광특성을 UV-Vis를 통해 분석하였다.

• 한국펄프종이공학회:학술대회논문집
• /
• 한국펄프종이공학회 1999년도 춘계학술발표논문집
• /
• pp.78-83
• /
• 1999

In this paper the extinction coefficients of molecule chlorine ($Cl_2$), chlorine dioxide (ClO$_2$), hypochlorous acid (HClO), chlorous acid ($HClO_2$$_2$) were determined using a PDA UV-VIS spectrophotometer. Based on these, the concentrations of $Cl_2$, $ClO_2$, and HClO in general chlorine dioxide bleaching liquor can be measured. The concentrations of $Cl_2$, $ClO_2$ and $HClO_2$ produced during the generation of methanol based chlorine dioxide generator can also be determined use the same method. The method was thought to be able to give more information in chlorine dioxide bleaching chemistry if combine its use with titration and ion chromatography.

• 한국염색가공학회지
• /
• 제18권1호
• /
• pp.28-32
• /
• 2006

A multi-layer of the dye, natural colorant Berberine, was successfully developed by the self-assembly deposition from water-soluble cationic dye(Berberine chloride) and anionic polyelectrolyte PSS(Polysodium 4-styrenesulfonate) in aqueous solution via electrostatic attraction. The corresponding results on multi-layer were characterized by UV-Vis absorbance measurements. The growth of multi-layer formed by the sequential interaction was also determined. The findings measured by UV-Vis spectrophotometer showed that the bilayer deposition characteristic was linear and highly reproducible from layer to layer.

• 한국응용과학기술학회지
• /
• 제12권1호
• /
• pp.115-118
• /
• 1995

Hexyltriphenylphosphonium-TCNQ(HTPP-TCNQ) complex for preparing organic thin film by Langmuir-Blodgett technique was synthesized from LiTCNQ and Hexyltriphenylphosphonium bromide. The structure of the new complex was confirmed by $^{1}H$ NMR, $^{31}P$ NMR, IR, UV spectroscopies, TGA and elemental analysis. A stability to spreading solvent, which is acetonitrile, ethylacetate, ethanol and acetonitrile-ethylacetate(1:1 v/v), of HTPP-TCNQ complex was investigated by UV-visible spectrophotometer. The complex was stabilized in acetonitrile, ethylacetate, aceton, acetonitrile-ethylacetate (1:1 v/v) for 6 h.

• 한국조명전기설비학회:학술대회논문집
• /
• 한국조명전기설비학회 1998년도 학술발표회논문집
• /
• pp.138-141
• /
• 1998

To evaluate the color change of the opaque resin materials, a measuring system including PAS(photodegradation acceleration system) was constructed. Xenon lamp is used as a light source in the PAS, and the radiant energy from the lamp is irradiated to the samples through serveral high-pass filters with cut-off wavelength in UV and visible region. The color difference of the samples were measured by using the measuring system with a spectrophotometer(CM-2002) and a computer. The result showed that the opaque resin materials changed severely in their color in the wavelength of UV region and changed a little in the wavelength of visible region.

• Elastomers and Composites
• /
• 제50권4호
• /
• pp.274-278
• /
• 2015

Nanosized gold particles were synthesized by microwave irradiation in a mixture composed of potassium tetrachloroaurate(III) n-hydrate, sodium citrate dihydrate and Tween 20. The synthesized gold particles were characterized by UV-vis spectrophotometer, scanning electron microscopy, and X-ray diffraction techniques. Using UV-vis spectroscopy, it was confirmed that gold nanoparticles act as a catalyst in the reduction of 4-nitroaniline with sodium borohydride to form 1,4-diaminobenzene. Additionally, we studied the kinetics of this reductive reaction in the presence of these gold nanoparticles under various conditions.

• 한국결정성장학회:학술대회논문집
• /
• 한국결정성장학회 1998년도 PROCEEDINGS OF THE 15TH KACG TECHNICAL MEETING-PACIFIC RIM 3 SATELLITE SYMPOSIUM SESSION 4, HOTEL HYUNDAI, KYONGJU, SEPTEMBER 20-23, 1998
• /
• pp.103-111
• /
• 1998

Au fine particle dispersed TiO2 film was prepared on silica glass substrate by sol-gel dip and firing process. The films were fabricated from the system of titanium tetraisoproxie-EtOh-HCl_H2O-hydrogen tetrachloroaurate(III) tetrahydrate. The conditions for the formation of the clear solution and dissolving high concentration of Au compound were examined. And a photoreduction process was adopted to control the size of gold metal particles. Phase evolution of matrix TiO2 and variation of Au particle with UV irradiation were investigated by XRDA, SEM, TEM and UV-visible spectrophotometer. And the effect of CPCl(Cetylpyridinium chloride monohydrate) as a dispersion agent was evaluated.