• Title/Summary/Keyword: Covering material

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Effect of Pelleting Treatment on Seed Germination in Adenophora triphylla (잔대 종자 펠렛처리가 종자 발아에 미치는 영향)

  • Im, Dong Hyeon;Nam, Joo Hee;Kim, Jong Hyuk;Lee, Min Ju;Rho, Il Rae
    • Korean Journal of Medicinal Crop Science
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    • v.28 no.2
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    • pp.128-135
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    • 2020
  • Background: Sowing seeds of Adenophora triphylla is known to be difficult owing to their small size and irregular seed shape. Therefore, this study was conducted to develop a seed pelleting technique to save labor during sowing. Methods and Results: To identify the optimal germination temperature for A. triphylla seeds, the temperature range was set from 17℃ to 32℃. Germination surveys were conducted in plastic greenhouse conditions in March, April, and May to determine the appropriate sowing time. The optimal germination temperature for A. triphylla seeds was 29℃ and May was the optimal sowing time in plastic greenhouse conditions. Covering materials for seed pelleting used talc (T), kaolin (K), calcium carbonate (C), and vermiculite (V). The pellet binder used agar (A), pectin, xanthan gum, polyvinyl alcohol (PVA), and sodium alginate (S). The best suited treatment mixture were the best suited in kaolin / calcium carbonate / vermiculite (KCV), talc / calcium carbonate / vermiculite (TCV) mixture treatment for covering material, and sodium alginate (S), agar (A) as pellet binder, respectively. The germination rate was the best in TCV mixed with S. Conclusion: The mixture of TCV (2 : 1 : 3) + 1.5% S (TCVS), was found to be the best pelleting materials for A. triphylla seeds, and seed pelleting can be labor-saving during sowing.

Effects of Rootball Media and Covering Materials for Air-layering on Rooting and Growth of Miniature Tree Material of Carpinus coreana (공중취목 피복재료가 소사나무 분재소재의 발근 및 생장에 미치는 영향)

  • 최병철;홍성각;김종진
    • Journal of Korea Foresty Energy
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    • v.21 no.1
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    • pp.32-40
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    • 2002
  • This study was carried out to investigate the effects of rootball media and covering materials for air-layering on the rooting and growth responses of miniature tree material. The experiment was performed with Carpinus coreana Nakai in the vinyl-house condition. The covering material, jute tape increased the diameter growth at 1cm above the girdling part of the tree material. The combined use of the soil mixture of peatmoss and perlite(2:1, by volume) as rootball medium and jute tape increased the dry weight of current year leaves and shoots. The number of shoot shorter than 10cm and that of leaves from the shoot were produced more by using a sphagnum moss for rootball medium than the soil mixture. The use of jute tape shortened the period required for rooting and increased the number of fine roots and the total root dry weight at girdling part of the tree material. On the other hand, the number of long roots was produced more by using the sphagnum moss than the soil mixture.

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A Study on the Properties of Fire Endurance and Spalling of High Performance RC Column with the Finishing and Covering Material (고성능 RC 기둥의 마감재 변화에 따른 폭열 및 내화특성에 관한 연구)

  • Han, Cheon-Goo;Hwang, Yin-Seong;Ji, Suk-Won;Kim, Kyoung-Min
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.10 no.2
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    • pp.143-152
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    • 2006
  • High performance concrete(HPC) has been widely used in high-rise building. The HPC has several benefits including high strength, high fluidity and high durability. However, spalling is susceptible to occur in HPC and HPC also tends to be deteriorated in the side of fire resistance performance at fire. This paper investigated the spalling prevention of high performance RC column. Control concrete showed severe failure and a case of concrete with fire enduring spraying material exhibited more severe spalling failure than even control concrete. In addition, concrete with fire enduring paint reported the most favorable spalling resistance effect for preventing spall, compared with other concrete covered with finishing materials, such as fire enduring spraying material, gypsum board, marble board and fire enduring PC board. Meanwhile, concrete adding 0.1% of PP fiber demonstrated spalling resistance performance after 3hours load bearing test.

Heat Loss Audit and Assessment of the Greenhouses Using Infrared Thermal Image Analysis (적외선 열화상 분석을 통한 온실의 열손실 진단 및 평가)

  • Moon, Jong-Pil;Yun, Nam-Kyu;Lee, Sung-Hyoun;Kim, Hak-Joo;Lee, Su-Jang;Kim, Young-Hwa
    • Journal of The Korean Society of Agricultural Engineers
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    • v.52 no.2
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    • pp.67-73
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    • 2010
  • Unlike Urban building, horticultural facilities has a lot of heat loss through plastic or glass covering material which could be much influential to growing plant and consuming energy for heating greenhouse. In many cases, heat loss from a break of cover, a gap of joint sealing, the entrance to greenhouse and windows for ventilation are the main factors considered in calculating the heating load for horticultural facilities. however the normal observation through human eye and digital camera could not recognize where the heat loss occurred. but the infrared thermal image camera with detecting thermal difference could be very effective for noticing heat loss by analyzing infrared thermal image. In this study, greenhouse structure, covering material, internal and external provisions for Horticultural facilities were surveyed in different sites and Infrared thermal camera shooting and image analysis were performed for auditing heat loss from cultivation facilities The results from this study were that unexpected heat loss had been noticed in 7 representative cases of greenhouse such as side wall covered with single or double plastic, and the joint of horizontal thermal curtain, roof without horizontal thermal curtain, entrance to greenhouse, windows for ventilation. the most important factors for keeping heat energy were whether the horizontal thermal curtain with multifold thermal material was installed or not. The internal or external covering using multifold thermal curtain proved to be the most effective ways to keep heat energy from losing through heat transmission, heat radiation. from inside to outside the horticultural facilities.

Study on the High Temperature Properties of Fireproof Mortar Using Various Types of Fine Aggregate (잔골재 종류에 따른 내화피복용 모르타르의 고온 성상에 관한 연구)

  • Lim, Seo-Hyung
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.2 no.2
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    • pp.100-106
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    • 2014
  • High strength concrete has a structural advantage as well as superior usability and durability, so that its application in building is being steadily augmented. However, in the high temperature like in a fire, the high strength concrete has extreme danger named explosive spalling. It is known that the major cause of explosive spalling is water vapour pressure inside concrete. General solution for preventing concrete from spalling include applying fire protection coats to concrete in order to control the rising temperature of members in case of fire. The purpose of this study is to investigate the high temperature properties of fireproof mortar using organic fiber and various types of fine aggregate for fire protection covering material. The results showed that addition of perlite and polypropylene fiber to mortar modifies its pore structure and reduces its density. This causes the internal temperature to rise. As a results, it is found that a new fireproof mortar can be used in the fire protection covering material in high strength concrete.

The Improvement on Insulation Performance of Underground Distribution Power Cables (지중배전케이블 절연성능 향상 방안)

  • Lee, Jae-Bong;Lee, Byung-Sung;Kim, Sang-Joon;Jang, Sang-Ok;Han, Yong-Huei;Oh, Jae-Hyoung
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.497-501
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    • 2004
  • The primary failure causes of underground distribution power cables are water penetration in insulation layer and stress enhancement at inner semi-conductive layer. Accordingly, it is needed to improve the materials and the structure of power cables for extending lifetime and preventing failure. We uses non-flaming PE materials instead of PVC as a covering material and encapsulating structure. We also use super smooth class material as a inner semi-conductive layer. The newly developed cables are improved in AC breakdown voltage after ageing tests.

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The Output Characteristics of 3kW BIPV System (3kW 건물일체형 태양광발전시스템의 출력특성)

  • Kim, Ji-Hoon;Kim, Pyouug-Ho;Lim, Yang-Su;Cho, Geum-Bae;Baek, Hyung-Lae;Oh, Geum-Gon
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.471-474
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    • 2006
  • BIPV(Building Integrated PV) system can expect dual effects that reduce expenses for establishment of PV system by adding new function as outer covering material of building expect producing the electricity. But, there are many generation differences according to the exterior environmental facts(solar cell away, design and installation condition of interactive inverter system) Therefore, it is difficult to optimum design. Consequently in advance design system, we experiment 3kW BIPV(Building Integrated PV) generation. We concrete PV system efficient application of variable. BIPV system that is proposed in this paper, was established in Solar Energy research center of Chosun University, composed with system. This research is a basic study for application of building integrated photovoltaic system for builing.

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Microclimatic Change and Growth Status by Soil-covering Material in Organic Garlic Cultivation

  • Kim, C.V.;Kim, J.S.;Seo, Y.J.;Heo, M.S.;Park, J.H.
    • Korean Journal of Organic Agriculture
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    • v.19 no.spc
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    • pp.234-237
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    • 2011
  • This study was carried out to investigate the effect of soil covering materials such as rice bran, rice hull and saw dust on garlic growth through a field experiment in wintertime. Rice bran was the smallest in term of particle size, but it recorded the highest level of bulk density. The missing plant rate after winter season was relatively high, 59.3%, and that of soil covering materials stood at the low level of 10%. Other growth factors recorded the highest level during application of rice bran. In terms of chemical properties of soil-covering materials, rice bran recorded the highest level of 1.84, 2.34 and 0.16% in the content of N, P, and K, respectively. The subsoil temperature was higher by application of rice bran as compared to that of other materials which stood at the lowest temperature ($-9^{\circ}C$).