• Title/Summary/Keyword: UV radiation

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Measurement of UV radiation of LED lighting

  • Ku, Seong-Mo;Im, Jong-Min;Yi, Chin-Woo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.3
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    • pp.7-14
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    • 2011
  • Many countries and researchers in the lighting field have focused on the LED light source as a solution to energy savings and environmental pollution. The LED light source consumes less power, has a long life and is highly economical. It is vibration and shock-resistant, and environment friendly as well. But LED lighting has some problems. In particular, the photobiological safety of LED light sources is emerging as an issue. Ultraviolet radiation from the LED light source emitted directly to the human body over a long period of time is harmful. In this paper, UV radiation from white LED was measured. Finally, the LED light source emits UV radiation, but it is relatively small when compared to others.

Enhanced Lycopene Production by UV-C Irradiation in Radiation-Resistant Deinococcus radiodurans R1

  • Kang, Chang Keun;Yang, Jung Eun;Park, Hae Woong;Choi, Yong Jun
    • Journal of Microbiology and Biotechnology
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    • v.30 no.12
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    • pp.1937-1943
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    • 2020
  • Although classical metabolic engineering strategies have succeeded in developing microbial strains capable of producing desired bioproducts, metabolic imbalance resulting from extensive genetic manipulation often leads to decreased productivity. Thus, abiotic strategies for improving microbial production performance can be an alternative to overcome drawbacks arising from intensive metabolic engineering. Herein, we report a promising abiotic method for enhancing lycopene production by UV-C irradiation using a radiation-resistant ΔcrtLm/crtB+dxs+ Deinococcus radiodurans R1 strain. First, the onset of UV irradiation was determined through analysis of the expression of 11 genes mainly involved in the carotenoid biosynthetic pathway in the ΔcrtLm/crtB+dxs+ D. radiodurans R1 strain. Second, the effects of different UV wavelengths (UV-A, UV-B, and UV-C) on lycopene production were investigated. UV-C irradiation induced the highest production, resulting in a 69.9% increase in lycopene content [64.2 ± 3.2 mg/g dry cell weight (DCW)]. Extended UV-C irradiation further enhanced lycopene content up to 73.9 ± 2.3 mg/g DCW, a 95.5% increase compared to production without UV-C irradiation (37.8 ± 0.7 mg/g DCW).

The Development of UV-IR Combination Flame Detector (UV-IR 복합형 화재감지장치 개발)

  • 이복영;권오승;정창기;박상태
    • Journal of the Korean Society of Safety
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    • v.16 no.1
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    • pp.1-8
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    • 2001
  • All objects emit thermal radiation and this radiation is the basis of the techniques used to detect flames. The usual phenomena occurring in the initial stage of the fire are generally invisible products of a combustion and visible smoke. Liquid or gaseous materials do not undergo a smoldering stage so that fires develop very rapidly. Also, the heat generated by the initial flames is usually not sufficient to activate a heat detector. In this case the most effective criterion for automatic fire detection is the flame. According to the fire regulation of korea, the compulsory standard provided that a flame detector shall be installed in a place that the attachment height of detector is higher than 20 m, chemical plants, hangar, refinery, etc.. The results of the research and development are discriminated between a flame and other radiant emitters, developed a UV detector tube contains an inert gas which absorbs UV radiation, developed PZT pyroelectric element is based on the use of photovoltanic cell, developed IR band-pass filter that only allow a 4.3 $\mu\textrm{m}$ radiation wavelength to reach the sensors and developed UV-IR combination flame detector combined into a single detection device.

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Physiological and Biochemical Responses of Fifteen Rice Cultivars to UV-B Radiation

  • Sung Jwa-Kyung;Chung Jong-Wook;Lee Sang-Min;Lee Yong-Hwan;Choi Du-Hoi;Kim Tae-Wan;Song Beom-Heon
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.50 no.1
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    • pp.39-44
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    • 2005
  • This study was conducted to examine the physiological and biochemical responses against UV-B radiation in the seedling of 15 different rice cultivars, having the different physiological sensitivities. Out of 15 rice cultivars tested, moderate and susceptible groups showed significant decreases in biomass and RGR (relative growth rate). Contents of total chlorophyll were reduced remarkedly by irradiation of UV-B. In all rice cultivars tested, the content of chlorophyll a was strongly decreased, while the contents of chlorophyll b were slightly reduced without showing clear different among three groups and 15 cultivars. Carotenoid content was largely reduced by UV-B radiation, whereas polyamine content was moderately increased. The contents of MDA (malondialdehyde) that reflect the level of lipid peroxidation of cell membranes were clearly increased by UV-B stress, showing higher content in susceptible cultivars than moderate and torelant cultivars. The physiological important parameters highly related to visible injury were leaf color, chlorophyll, carotenoid, and lipid peroxidation, whereas biomass and polyamines were not closely correlated. Based on this results, it was concluded that changes of visible injury and the contents of chlorophyll and MDA could be adequately applied and utilized as physiological indicators to UV-B radiation.

Growth and Physiological Responses of Shade Intolerant and Intermediate Tree Seedlings to Enhanced UV-B Radiation (자외선(紫外線)-B 증가조사(增加照射)에 대한 양수(陽樹)와 중성수(中性樹) 유묘(幼苗)의 생장(生長)과 생리적(生理的) 반응(反應)에 관한 연구(硏究))

  • Kim, Jong Jin;Hong, Sung Gak
    • Journal of Korean Society of Forest Science
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    • v.88 no.4
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    • pp.469-476
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    • 1999
  • This study was carried out to investigate the growth and physiological response of shade intolerant and intermediate tree seedlings to enhanced UV-$B_{BE}$(biologically effective UV-B) radiation. The seedlings of Betula platyphylla var. japonica Hara(shade intolerant species) and Fraxinus rhynchophylla Hance(shade intermediate species) were treated with one of the three levels of UV-$B_{BE}$ dosages - ambient UV-$B_{BE}$, ambient+3.2, and ambient+$5.2\;KJ\;m^{-2}day^{-1}$) for 14 weeks in the field condition. Height and root collar diameter growth, leaf area, and biomass production of the seedlings of two species were reduced by enhanced UV-B radiation. Leaf stomatal resistance to water vapor of the F. rhynchophylla seedling was increased by the UV-B increment. The reductions in total chlorophyll and carotenoid were more apparent in the F. rhynchophylla than B. platyphylla seedling. There was no statistically significant changes in the concentration of UV-B absorbing compound($A_{300}$) in the leaves of the two species among the UV-B treatment. However the $A_{300}$ tented to be increased in F. rhynchophylla by enhanced UV-B radiation. These results indicate that the growth and the physiological and biochemical responses between B. platyphylla and F. rhynchophylla were different to enhanced UV-B environment.

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The Changes of UV-B Radiation at the Surface due to Stratospheric Aerosols (성층권 에어로졸에 의한 지표면 UV-B 복사량 변동)

  • Jai-Ho Oh;Joon-Hee Jung;Jeong-Woo Kim
    • International Union of Geodesy and Geophysics Korean Journal of Geophysical Research
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    • v.21 no.1
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    • pp.31-46
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    • 1993
  • A radiative transfer model with two-stream/delta-Eddington approximation has been developed to calculate the vertical distributions of atmospheric heating rates and radiative fluxes. The performance of the model has been evaluated by comparison with the results of ICRCCM (Intercomparison of radiative codes in climate models). It has been demonstrated that the presented model has a capability to calculate the solar radiation not only accurately but also economically. The characteristics of ultraviolet-B radiation (UV-B; 280-320nm) are examined by comparison of relation between the flux at the top of atmosphere and that at the surface. The relation of UV-B is quadratic due to the strong ozone absorption in this band. Also, the dependence of the UV-B radiation on the stratospheric ozone depletion and stratospheric aerosol haze due to volcanic eruption on the stratospheric ozone depletion and stratospheric aerosol haze due to volcanic eruption has been tested with various solar zenith angles. The surface UV-B increases as the solar zenith angle increases. The existence of stratospheric aerosols causes an increase in the planetary albedo due to the aerosols' backscattering. The planetary albedo with aerosol's effect has been increases as the solar zenith angle is not sensitive. It may be caused by the fact that the aerosols' scattering effect becomes saturated with the relatively long path length in a large solar zenith angle. Finally, the regional impact of stratospheric aerosols due to volcanic eruption on the intensity of UV-B radiation at the surface has been estimated. A direct effect is that the flux is diminished at the low latitudes, while it is enhanced in the high latitudes by the aerosols' photon trap or twilight effect. In the high latitudes, both aerosols' scattering and ozone absorption have strong and opposite impacts to the surface UV-B radiation is located at the mid-latitudes during spring season in both hemispheres.

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Compositional changes in mycosporine-like amino acids induced by UV radiation: marine dinoflagellate Scrippsiella sweeneyae

  • Taira, Hitomi;Yabe, Kazuo;Taguchi, Satoru
    • Journal of Photoscience
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    • v.9 no.2
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    • pp.445-447
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    • 2002
  • The compositional changes in mycosporine-like amino acids (MAAs) were investigated in the marine dinoflagellate Scrippsiella sweeneyae exposed to four different spectral compositions and five relative intensities of UV-B (280-320 nm) to UV-A (320-400 nm) + photosynthetically available radiation (PAR: 400-700 nm). Neither dose nor wavelengths of UVR significantly affected the growth rates. UVR caused a significantly increase in cell volume. Cell volume in the >280nm treatment was more than two times greater at 6.8 % of UVR intensity. Production of UVR induced MAAs was dependent on the dose of UVR. However. the induction of MAAs was related to the cell growth. Greater induction of MAAs was observed at shorter wavelengths. The composition of MAAs varied with increasing light intensity of UVR.

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Cholesteric Liquid Crystals as Multi-Purpose Sensor Materials

  • Lisetski, L.N.
    • Journal of Radiation Protection and Research
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    • v.30 no.1
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    • pp.27-30
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    • 2005
  • New possibilities are discussed for cholesteric liquid crystals (CLC) as sensor materials for detection of ionizing radiation, biologically active UV radiation, and the presence of hazardous vapors in atmosphere. A distinguishing property of CLC-based detectors is their 'bioequivalence', i.e., mechanisms of their response to external factors essentially imitate the corresponding mechanisms of biological tissues. Such detectors can ensure sufficiently high sensitivity to make feasible their use as alarm indicators or in biophysical studies. Specific examples ate given of sensor compositions and their response characteristics.

Influence of Dust Environment on the Detection Capability of Ultraviolet Flame Detector (UV 화염감지기의 감지성능에 대한 분진분위기의 영향)

  • Kim Hong;Hu Rui
    • Journal of the Korean Institute of Gas
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    • v.1 no.1
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    • pp.113-119
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    • 1997
  • The detection capability of UV flame detector in dust environment would be impaired. In this study, an experiment was conducted, in an effort to further understand the behavior of UV flame detector and to evaluate its detection capability in industry dust environment. Detergent powder, coal powder and dry extinguishing agent were selected as dust sources. Flaming sources include propane and gasoline flame. Experiment results indicate that dust can cause remarkable attenuation of UV flame radiation. The concentration of dust and the length of air layer where dust dispersed determine the reduction of radiation intensity. On the other hand, the attenuation of UV radiation also depends on the chemical and Physical properties of dust.

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A Study on Optimal Design of UV Contactor using an Optical Radiation Model (광학모델을 이용한 자외선 접촉조 최적 설계에 관한 연구)

  • Choi, Younggyun;Kim, Dooil;Kim, Sunghong
    • Journal of Korean Society on Water Environment
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    • v.25 no.4
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    • pp.547-552
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    • 2009
  • Because of refractory property of light, the travel path of UV light becomes longer than the straight line and shorter solely in water as UV light passes sequentially through air, quartz and water. Note that water significantly absorbs UV light. Hence, UV intensity shall be estimated to be lower when refraction is neglected than it is considered. Reflection is also critical for the design of UV radiation system. While the reflection at the interface of air and quartz is low enough to ignore, it is too high to be ignored at the interface of quartz and water. Assuming constant power, smaller length to width ratio of UV reactor is beneficial and single-lamp system is preferred to multi-lamps. Under the given cross section, optimal lamp positions could be decided. For example of an elliptical reactor with dual lamps, the optimal lamp locations shall be the 1/3 and 2/3 position of the longer axis.