• Title, Summary, Keyword: sunlight

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A Study on the Implementation of Sunlight Tracking and Reflexing System Using Fuzzy Pm and 2-Axis Sensor Sun Tracker (퍼지 PID와 2축 센서형 태양 추적 장치를 이용한 태양광 추적 반사 장치 구현에 관한 연구)

  • 안정훈;김종화;김태훈;김대영
    • 제어로봇시스템학회:학술대회논문집
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    • pp.165-165
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    • 2000
  • The sunlight tracking and reflexing system can be divided into two parts. One is a sunlight tracking system and the other is a sunlight reflexing system. The sunlight tracking system detects an azimuth angie and an elevation angle of the sun using 2-axis sensor sun tracker. The sunlight reflexing system controls a reflection mirror to be reflected a sunlight at the target area after getting the azimuth angle and the elevation angle of the sun from the sunlight tracking system. We applied the fuzzy PID controller to control the reflexing mirror.

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Photodegradation of Butachlor and Pyrazosulfuron-ethyl in Rice Paddy Water under Natural Sunlight

  • Ok, Junghun;Watanabe, Hirozumi;Cho, Junglai;An, Nanhee;Lee, Byungmo
    • Korean Journal of Environmental Agriculture
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    • v.33 no.2
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    • pp.134-137
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    • 2014
  • BACKGROUND: Dissipation of herbicides in paddy water varies significantly, being dependent on environmental conditions such as sunlight. The photodegradation under natural sunlight may be one of natural degradation routes of herbicides dissipation. Therefore, the aim of this study was to monitor the degradation of butachlor and pyrazosulfuron-ethyl in paddy water under natural sunlight. METHODS AND RESULTS: The 12 water sample bottles of treatment were covered by quart glass plates, which allow about 90% of UV radiation (280-2000 nm) to pass through, to minimize the UV attenuation. The other 12 water sample bottles of the control were covered by glass lids and wrapped with aluminum foils to prevent the sunlight. The concentration of butachlor and pyrazosulfuron-ethyl in paddy water samples bottles was monitored under ambient conditions with and without natural sunlight. The concentration of butachlor and pyrazosulfuron-ethyl for treatment decreased from $355.3{\mu}g/L$ to $37.8{\mu}g/L$ and from $10.5{\mu}g/L$ to $3.9{\mu}g/L$, respectively, during consecutive 21 days after herbicide application under natural sunlight. CONCLUSION: The concentration of butachlor in paddy water decreased quickly under ambient conditions with natural sunlight. The degradation of butachlor in paddy water was enhanced by the natural sunlight. However, the degradation of pyrazosulfuron-ethyl was insignificant under natural sunlight.

Spectral Analysis of Sunlight Collector System (태양광 채광시스템의 스펙트럼 분석)

  • 박준석;어익수;여인선
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.80-84
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    • 1999
  • Sunlight Collector System is a new way to make sunlight available to living things. It transmits sunlight through fiber optics to wherever is needs. It applies the artificial lighting, underground lighting, intelligent building, museum lighting, restoration-room to health etc. Cutting out most of the ultra-violet and intra-red radiation. In this paper, we measured the spectrum analysis of sunlight and Sunlight collector System's light. Also, we found out the distance to get visible light.

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Influence to give to a performance evaluation and sunlight reflection properties of the building crustal material (건물외피 재료의 성능평가와 일사반사 특성에 미치는 영향)

  • Sang, Hie-Sun;Kwak, Sung-Gun;Lee, Jeung-Seok;Yoshida, Atsumada
    • 한국태양에너지학회:학술대회논문집
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    • pp.177-186
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    • 2011
  • We can expect reduction of the sunlight absorption quantity to a structure and an earth surface, a decline of the surface temperature and a decline of the heat transport volume in what there is a method I give the sunlight reflectance in the aspect to the surface of the building by painting sunlight high reflectance paint, and to reduce the sunlight absorption quantity to a structure and an earth surface and does so, and, in addition, a method high water retentivity of tree planting and the road surface of the city space uses evaporation latent heat of the water by making it, and to restrain a rise in temperature is thought about. and It is thought that I reduce the sunlight absorption quantity to not only the structure but also other structures and attention gathers to the reflexive reflector reflecting in the direction again and it is wide as a marker of a board and the clothing of the traffic sign and is used the incidence energy from a source of light for this reflexive reflector now by there is it and devises surface structure again, and controlling reflection directivity for the sunlight for the purpose of raising night visibility.

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Comparison of Growth and Leaf Characteristics of Parasenecio firmus by Different Relative Light Intensity in Forest Farming (임간재배지에서 상대광도에 따른 병풍쌈의 생장 및 엽특성 비교)

  • Song, Ki Seon;Jeon, Kwon Seok;Yoon, Jun Hyuck;Kim, Chang Hwan;Park, Yong Bae;Kim, Jong Jin
    • Korean Journal of Medicinal Crop Science
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    • v.22 no.4
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    • pp.295-300
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    • 2014
  • This study was carried out to produce more Parasenecio firmus in forest farming. In order to achieve this purpose, it was surveyed the growth and photosynthetic characteristics of P. firmus. Relatively light intensity was controlled by 100%, 60%, 30% and 5% of full sunlight. Height was the highest under 5% of full sunlight. Shoot diameter was the highest in full sunlight. Fresh weight (leaf, stem, root and total) and dry weight (leaf, root and total) were the highest under 30% of full sunlight. S (leaf+stem)/R (root) ratio was the lowest under 30% of full sunlight and the highest under 5% of full sunlight. In leaf characteristics, leaf area, SLA and LAR were getting higher in the lower light level and the highest under 5% of full sunlight ($176.1cm^2$, $420.5cm^2{\cdot}g^{-1}$ and $123.5cm^2{\cdot}g^{-1}$). Especially, leaf area was surveyed higher under 30% of full sunlight in the next. Leaf thickness was getting lower in the lower light level and the lowest under 5% of full sunlight (overall 0.14~0.24 mm). As a result of surveying the whole experiment, P. firmus grows well under 30% and 5% of full sunlight in forest farming.

Changes in Chloroplast Ultrastructure and Thylakoid Membrane Proteins by High Light in Ginseng Leaves

  • Woo Kap Kim
    • Journal of Plant Biology
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    • v.37 no.3
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    • pp.285-292
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    • 1994
  • Ultrastructural changes in Panax ginseng C. A. Meyer mesophyll chloroplasts and variation of thylakoid membrane protein in responce to the light intensity were studied in leaves of two-y-old plants exposed to two different light intensities under field coditions. The leaves were allowed to function for three months after emergence under two contrasting light conditions. The ginseng chloroplasts of 5% light were filled with highly stacked grana of condensely arrayed thylakoids, so that the stroma space was hardly observed. In contrast, chloroplasts from leaves at 100% sunlight had fewer thylakoid membranes and smaller grana stacks. The number of osmiophilic globules increased. Total Chl content and Chl b content were lower at 100% sunlight than 5% sunlight. The thylakoid membrane proteins in the leaves grown at 100% sunlight showed lower CPIa, LHCII and CP29 than those with 5% sunlight. This effect was most obvious for LHCII. Polypeptides showed major bands at 90, 64, 29-30, 22 and 14 kD, and minor bands at 59, 58, 54, 52, 49, 46, 44, 35, 23, 21 and 18-19 kD. All these bands were lower in intensity in the leaves exposed to 100% sunlight. Moreover, the bands at 58-59, 46-47 and 23 kD disappeared.

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Growth and Root Development Characteristics of Atractylodes japonica Seedlings by Different Relative Light Intensity (상대광도별 삽주 유묘의 생장 및 뿌리 발달 특성)

  • Song, Ki Seon;Jeon, Kwon Seok;Yoon, Jun Hyuck;Kim, Chang Hwan;Park, Yong Bae;Kim, Jong Jin
    • Korean Journal of Medicinal Crop Science
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    • v.22 no.2
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    • pp.154-159
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    • 2014
  • This study was carried out in order to investigate the early growth and root development characteristics of Atractylodes japonica container seedling. Experiment was performed by light intensity (100%, 60%, 25% and 10% of full sunlight). Height was surveyed well under 25% of full sunlight (overall 11.013.0%). Root collar diameter was the highest in the full sunlight (7.52 mm). It was the highest fresh weight (1.52 g, 0.92 g, 0.90 g and 3.34 g) under 25% of full sunlight, root dry weight was getting higher in the higher light level and the highest in the full sunlight (0.13 g). Total root length, root project area, root surface area and root volume were the highest under 25% of full sunlight (434.7 cm, $17.4cm^2$, $54.7cm^2$, $0.55cm^3$, respectively) and the lowest under 10% of full sunlight. As a result of surveying the whole experiment, A. japonica is judged nicely by maintaining 25% of full sunlight, excepting 10% of full sunlight. And light levels during the early growth are overly important to improve early growth.

Effects of Sunlight Transmitted Packaging Materials upon Rancidity of Oils and Fats (플라스틱 포장재를 투과한 태양 광선이 산패에 미치는 영향)

  • Lee, Ki-Chang;Hwang, Sun-Geun;Yang, Cheon-Hoi
    • Journal of the Korean Applied Science and Technology
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    • v.2 no.1
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    • pp.19-23
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    • 1985
  • In order to know the quality changes of the fat and oil foods packed in plastics film by the sunlight, we examined the sunlight transmitting rate by the kind of films and measured the acid value and peroxide value according to it. The results obtained were as follows : 1. The sunlight transmitting rate of various films was explained especial permeability under the wavelength of less than 300nm, but it marked a regular form under that of more than 30nm. 2. The vacuum evaporation film with aluminum on the polyester shuts off most of the sunlight, therefore, it has the best effect that keeps the fats and oils off rancidity. 3. The sunlight transmitting rate of the white color printing film drops about 80% as compared with not printing. 4. The preventive power against the rancidity of fats and oils is PET/Al, PET, PE, nylon and OPP film in that order. The changes of peroxide value and acid value were approximately the same as that of the sunlight transmitting rate.

A Study on the Application of Sunlight System Using an Optical fiber (광섬유를 이용한 자연채광시스템 적용 연구)

  • An, Seungju;Han, Sangju;Hong, Woosik;Choi, Changho;Lee, Jongheok
    • 한국신재생에너지학회:학술대회논문집
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    • pp.51.2-51.2
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    • 2010
  • In recently, interests in the New & Renewable Energy are increasing because of exhaustion of fossil energy and limit of greenhouse gas emission all over the world. Furthermore, improvements in living standards and high-raise Buildings due to the industrial growth require a lot of sunlight in the interior space. Sunlight system gets the natural light into the indoor dark space. There are a lot of type of systems which are reflector type, duct type, optical fibers type and so on. And these systems consist of light-collection module, light-transporting module and light-emitting module. In this research, we installed optical fiber sunlight system in our head office building and tested the system's performance and efficiency. Optical fiber sunlight system is closely connected with hour of sunlight, due to the system have to chase the sun for the solar concentrating, and the system's light-collection and light- transporting efficiency is important factors in the system's performance. As a result of the test, system can be used about 5.66 hours on average in a day, and it has a about 3.21 times collection efficiency and 5.5% transmission loss.

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Is Sunlight a Predisposing Factor for Triple Negative Breast Cancer in Turkey?

  • Mutlu, Hasan;Buyukcelik, Abdullah;Colak, Taner;Ozdogan, Mustafa;Erden, Abdulsamet;Aslan, Tuncay;Akca, Zeki
    • Asian Pacific Journal of Cancer Prevention
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    • v.14 no.2
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    • pp.801-803
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    • 2013
  • Intraduction: There is known to be a relationship between vitamin D level and more aggresive breast cancer subtypes, especially triple-negative breast cancer (TNBC). It was reported that sunlight exposure has an effect on the prognosis of patients with cancer, possibly related to the conversion of vitamin D to its active form with sunlight. We aimed to evaluate the effect of sunlight exposure on patients with TNBC. Materials-Methods: A total of 1,167 patients with breast cancer from two different regions of Turkey (Antalya and Kayseri, regions having different climate and sunlight exposure intensity over the year) were analysed retrospectively. The ratio of patients with TNBC was identified in those two regions. Results: The ratio of patients with TNBC was 8% and 12% for Kayseri and Antalya regions, respectively, and this difference between the two groups was statistically significant (p=0.021). Discussion: Sunlight exposure may be associated with more prevalent TNBC. This finding should be investigated with a prospective study.