• Title/Summary/Keyword: 광화학적

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2003년 여름 동안 서울 지역에서의 오존의 광화학적 특성에 대한 사례 연구

  • Son, Jang-Ho
    • Proceedings of the Korean Environmental Sciences Society Conference
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    • 2005.05a
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    • pp.193-195
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    • 2005

  • 광화학측정이 이루어진 기간 중 일사량이 강한 날에 관측 오존의 농도와 광화학 모델의 광화학 정류상태로 추정된 오존의 농도는 아주 밀접한 근접성을 보였다. 광정류 상태로부터의 이탈 정도에 영향을 미치는 인자로는 측정 지역 근처에서의 지역적 NO$_{2}$ 생성원의 존재, 지역적 NO 또는 오존의 소멸, 비 정류상태 조건, 또는 측정의 오차 등에 기인한 것으로 추정된다. 오존의 생성 속도에 가장 크게 영향을 주는 화학반응은 NO와 HO$_{2}$의 화학반응으로 나타났다.

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Genetic Environments of Au-Ag-bearing Gasado Hydrothermal Vein Deposit (함 금-은 가사도 열수 맥상광상의 성인)

  • Ko, Youngjin;Kim, Chang Seong;Choi, Sang-Hoon
    • Economic and Environmental Geology
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    • v.55 no.1
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    • pp.53-61
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    • 2022

  • The Gasado Au-Ag deposit is located within the south-western margin of the Hanam-Jindo basin. The geology of the Gasado is composed of the late Cretaceous volcaniclastic sedimentary rocks and acidic or intermediate igneous rocks. Within the deposit area, there are a number of hydrothermal quartz and calcite veins, formed by narrow open space filling along subparallel fractures in the late Cretaceous volcaniclastic sedimentary rock. Vein mineralization at the Gasado is characterized by several textural varieties such as chalcedony, drusy, comb, bladed, crustiform and colloform. The textures have been used as exploring indicators of the epithermal deposit. Mineral paragenesis can be divided into two stages (stage I, ore-bearing quartz veins; stage II, barren carbonate veins) considering major tectonic fracturing event. Stage I, at which the precipitation of Au-Ag bearing minerals occurred, is further divided into three substages (early, middle and late) with paragenetic time based on minor fractures and discernible mineral assemblages: early, marked by deposition of pyrite and pyrrhotite with minor chalcopyrite, sphalerite and electrum; middle, characterized by introduction of electrum and base-metal sulfides with minor argentite; late, marked by argentite and native silver. Au-Ag-bearing mineralization at the Gasado deposit occurred under the condition between initial high temperatures (≥290℃) and later lower temperatures (≤130℃). Changes in stage I vein mineralogy reflect decreasing temperature and fugacity of sulfur (≈10-10.1 to ≤10-18.5atm) by evolution of the Gasado hydrothermal system with increasing paragenetic time. The Gasado deposit may represents an epithermal gold-silver deposit which was formed near paleo-surface.

  • https://doi.org/10.9719/EEG.2022.55.1.53 인용 PDF KSCI

Photothermal and Photochemical Investigation on Laser Ablation of the Polyimide by 355nm UV Laser Processing (355nm UV 레이저 가공에 의한 폴리이미드의 광화학적 및 광열적 어블레이션에 관한 연구)

  • Oh, Jae-Yong;Shin, Bo-Sung
    • Journal of the Korean Society for Precision Engineering
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    • v.24 no.4 s.193
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    • pp.147-152
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    • 2007

  • UV laser ablation of polyimide is a combination of photochemical and photothermal mechanism. Photochemical mechanism is that molecular bonds are broken by photon energy and photothermal is evaporation and melt expulsion. When the laser processing, the etching depth needs to be calculated for prediction of processing result. In this paper, in order to predict the laser etching depth of polyimide by UV laser with the wavelength of 355nm, the theoretical model which includes both the photothermal and the photochemical effect was introduced. The model parameters were obtained by comparing with experimental results. The 3rd harmonic $Nd:YVO_4$ laser system was used in the experiment. From these experimental and theoretical results, the laser ablation of a polyimide was verified to achieve the highest quality microstructure.

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Photochemical Reduction of trans-1,2-Bispyrazylethylene (트란스-1,2-비스피라질에틸렌의 광화학적 환원)

  • Sang Chul Shim;Jeong Seok Chae
    • Journal of the Korean Chemical Society
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    • v.21 no.2
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    • pp.102-107
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    • 1977

  • Photochemical reduction of 1,2-bispyrazylethylene,a stilbene like heterocompound, was studied in hydrogen donating solvents and reduction product, 1, 2-bispyrazylethane, was identified. Salt and solvent effects on the quantum yields of the reduction, sensitization and quenching studies showed that the reactive state for the photochemical reduction of the compound is $(n,{\pi}^*)^1$ state rather than $({\pi},{\pi}^*)^1$ state.

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