• Title/Summary/Keyword: moisture value

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Verification of the Validity of Moisture Transfer Model for Prediction of Indoor Moisture Generation Rate (실내 수증기 발생량 예측을 위한 습기 전달 모델의 검증에 관한 연구)

  • Lee, Dong-Kweon;Kim, Eui-Jong;Choi, Won-Ki;Suh, Seung-Jik
    • Journal of the Korean Solar Energy Society
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    • v.26 no.1
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    • pp.41-47
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    • 2006
  • Moisture in a building is one of the most important variables influencing building performance, human health, and comfort of indoor environment. However, there are still lacks in the knowledge of understanding the moisture problem well and controlling moisture. Accordingly, in order to provide the fundamental data to control moisture contents in the indoor air, this study was to predict moisture contents transferred through building envelopes and indoor moisture generation rate. Moisture transfer model was made by physical relations in each node, and the indoor moisture generation rate was gained by comparing the model with experimental analyses. From the study, we found out that moisture generation rate was critical and day-periodic, so that we predicted the indoor moisture content by substituting the constant value gained from the average in a day for the moisture generation rate.

Study on the Growth and the Drought Resistance of Amorpha fructicosa under the Control of Water Supply (수분공급조절에 의한 족제비싸리의 생장과 내건성에 관한 연구)

  • Hong, Kyung-Hae;Kim, Woen
    • The Korean Journal of Ecology
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    • v.5 no.2_3
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    • pp.123-131
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    • 1982
  • The growth and the resistance of Amorpha fructicosa L. under water control was experimented in frames out of doors. The plant grew in a wagner's pot under water control. The soil moisture content was controlled at 5%, 10%, 15% and 20%. The growth of leaf, stem and root in the groups of 5% and 10% soil moisture content were different from values in the groups of 15% and 20%. The T/R ratio in the groups of 5% and 10% soil moisture content were different from the ratio in the groups of 15% and 20% soil moisture content. The T/R ratio of former was lower than the latter, but the C/F ratio of the former was higher than the latter. RGR and NAR of Amorpha fructicosa decreased in 5% and 10% soil moisture content but increased in 15% and 20% soil moisture content during growing period. The maximum values of RGR and NAR were respectively 0.089 and 0.080 at 20% soil moisture content. The highest value of LAR was 1.560 at 5% soil moisture content. RGR and NAR were comparatively affected by soil moisture content.

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The Changes of Lipid Oxidation and Fatty Acid Composition of Extruded Pellet Feed by Dietary Moisture Level and Storage Temperature (수분함량과 저장온도에 따른 배합사료의 지방산화 및 지방산 조성 변화)

  • Jang, Mi-Soon;Kim, Kyoung-Duck;Kim, Kang-Woong;Lee, Jong-Yun;Kang, Yong-Jin
    • Journal of Aquaculture
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    • v.21 no.4
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    • pp.226-233
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    • 2008
  • This study investigated the effects of dietary moisture level and storage temperature on lipid oxidation and fatty acids composition of the extruded pellet feed. The diets containing the moisture levels of 5%, 15% and 25% were prepared by adding moisture (water) to the commercial extruded pellets and stored at $5^{\circ}C$, $20^{\circ}C$ (room temperature) and $35^{\circ}C$. The samples for analysis were collected at every 2 days for 10 days. Acid value (AV), peroxide value (POV), 2-thiobarbituric acid (TBA) value and fatty acid composition of the feeds were measured. No differences in the AV, POV and TBA value were observed in feed containing 5% moisture at all storage temperatures for 10 days. However, the AV, POV and TBA value of diets containing 15% and 25% moisture increased rapidly at $20^{\circ}C$ and $35^{\circ}C$ after 4 days. Fatty acids compositions of feeds containing 5% moisture did not change during the storage periods at $5^{\circ}C$ and $20^{\circ}C$. However, 5% moisture feed stored at $35^{\circ}C$ increased monoene fatty acid content and decreased the contents of polyene fatty acid, PUFA (polyunsaturated fatty acid)/SFA (saturated fatty acid) and $(C_{20:5}+C_{22:6})/C_{16:0}$ after 4 days. Also, 15% moisture feed stored at $35^{\circ}C$ showed increased monoene fatty acid content and decreased $(C_{20:5}+C_{22:6})/C_{16:0}$ after 2 days. The diet containing 25% moisture showed increased monoene fatty acid content and decreased contents of PUFA, PUFA/SFA and $(C_{20:5}+C_{22:6})/C_{16:0}$ at all temperatures after 2 days. In this study, lipid oxidation can occur in the extruded pellet feeds of 15% and 25% moisture at room temperature after 2 days.

Analysis of Rheological Properties of Rye Flour (호밀가루의 레올로지 특성분석)

  • Lee, Gwi-Hyun
    • Journal of Biosystems Engineering
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    • v.35 no.6
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    • pp.408-412
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    • 2010
  • Rheological properties of cereals such as rye are great important for the design of die for extrusion and the development of models for extrusion process. Therefore, this study was carried out to analyze the rheological properties according to moisture content of rye flour and extrusion temperature. Rheological properties of rye flour were investigated by using a capillary rheometer for moisture content of three levels (30, 35, 40%) and extrusion temperature of three levels (120, 130, $140^{\circ}C$). Determination coefficients for the relationship between apparent shear stress ($\tau_{ap}$) and apparent shear velocity ($\gamma_{ap}$) were relatively high in the range of 0.973 ~ 0.997 under each extrusion condition. The values of consistency index (K) was decreased with increasing moisture content and extrusion temperature. However, the value of flow behavior index (n) presented the highest value at moisture content of 35%, but it was not affected by extrusion temperature.

Effect of Cations on the Sorption and the Tensile Properties of CMC Fibers (CMC섬유내의 양이온이 섬유의 흡습성과 인장 성질에 미치는 영향)

  • 이미식
    • Journal of the Korean Society of Clothing and Textiles
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    • v.18 no.1
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    • pp.113-120
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    • 1994
  • The Purpose of this study was to improve the moisture related properties of viscose rayon fibers. Viscose rayon filament yarns were partially etherified to make CMC fibers. CMC fibers were converted to the sodium, calcium, and ferric salt forms by an ion exchange method. The property changes of ion exchanged CMC fibers were examined. Cation contents of fibers were varied depending on the degree of substitution of CMC fibers. The strength of Na, Ca, Fe-CMC was higher than H-CMC owing to the plasticization by moisture sorption and the crosslinking by cations. The moisture regain was increased by carboxymethylation and that of Fe-CMC showed the highest value. The degree of swelling determined by the water retention value was observed to be Na-CMC > Ca-CMC > H-CMC > Fe-CMC. The solution retention value was decreased in the order . Ca-CMC > Na-CMC > H-CMC > Fe-CMC.

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INFLUENCE OF SLAUGHTER WEIGHT, SIRE, CONCENTRATE FEEDING AND MUSCLE ON THE PHYSICAL AND CHEMICAL CHARACTERISTICS IN JAPANESE BLACK BEEF

  • Mitsumoto, M.;Mitsuhashi, T.;Ozawa, S.
    • Asian-Australasian Journal of Animal Sciences
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    • v.5 no.4
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    • pp.629-634
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    • 1992
  • Seventeen Japanese Black steers were used to evaluate the influence of slaughter weight (550 kg, 600 kg or 650 kg), sire (two sires), concentrate feeding (barley or corn) and muscle (six muscles) on the following characteristics: pH value, cooking loss, shear value, moisture and crude fat contents. Crude fat contents were higher, and moisture content and shear values were lower in muscles from the large slaughter weight group 650 kg than those from other slaughter weight groups. Cooking loss, shear value, moisture and crude fat contents differed between sires. Corn feeding increased crude fat content in muscle compared to barley feeding. Muscles containing a large amount of intramuscular fat showed lower shear values and less cooking loss than those containing a small amount of intramuscular fat.

Quality Characteristics of Paeksolgi Added with Omija Water Extracts (오미자 추출액을 첨가한 백설기의 관능적 품질 특성)

  • 정현숙
    • Journal of the East Asian Society of Dietary Life
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    • v.8 no.2
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    • pp.173-180
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    • 1998
  • This study was conducted to examine the sensory quality, the degree of gelatization, pH, color, texture and moisture content of paeksolgi with omija water extracts added. The results of the analysis were as follows : The moisture contents of Paeksolgi were about 36~39%. The L value of the control group was 83.04 The degree of the colour was (L value: 71.82~86.56), (a value: -1.33~+0.78), (b value : 7.84~9.78). As the amount of omija water extracts was increased. the L and a values increased, but the b value showed a similar value, It was found that the yellowness decreases by increasing the soaking time of each type. The gelatinization of Paeksolgi with omija water extracts added was decreased as the amount of omija was increased. The sensory quality of paeksolgi with 5~7% omija water extracts added showed the most favorable sensory evaluation. In view of color, after taste and overall quality, the D$_2$group of Paeksolgi was preferable to the other paeksolgi groups with omija water extracts added.

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Upgrading the Quality of Silk Worm Oak(Quercus acutissima Carr.) Fiberboard through Paraformaldehyde Treatment by the Dry Forming Process (파라포름알데히드 처리(處理)에 의한 상수리나무 건식섬유판(乾式纖維板)의 재질개량(材質改良))

  • Koo, Ja-Oon;Shin, Dong-So;Shim, Chong-Supp
    • Journal of the Korean Wood Science and Technology
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    • v.10 no.3
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    • pp.189-189
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    • 1982
  • This study was carried out to determine the possibility of making fiberboard through the dry forming process, utilizing the tannin-like material of the Asplund pulp from the silk worm oak as a binder. The fiberboard was made through paraformaldehyde treatment, spray of NaOH solution and adjustment of mat moisture content, by hot-pressing at $220^{\circ}C$, and 50-6-50kg/$cm^2$ pressure with 6-min. (0.6-1.8-3.6) three-stage pressing cycle. The results are summarized as follows: 1. The modulus of rupture value of fiberboard treated with NaOH solution was greater than that of untreated. The value was increased in proportion to the paraformaldehyde content from I to 5%, but there was no increasing between 5 and 7% paraformaldehyde content. The value became higher along with the increase of mat moisture content from 15% to 25%. 2. The water adsorption of fiberboard treated with NaOH solution was lower than that of untreated. The value was de"creased in proportion to the paraformaldehyde content from 1 to 5%, but there was no decreasing between 5 and 7% paraformaldehyde content.. 3. A good quality fiberboard (modulus of rupture value of about 250kg/$cm^2$) was made through 5% paraformaidehyde treatment and 3% treatment of 10% NaOH solution, when the mat moisture content was 25%. was 25%.

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Photosynthetic Characteristics of Sedum takevimense on Various Moisture Conditions in a Green Roof System (옥상녹화시스템에서 수분 조건에 따른 섬기린초의 광합성 특성)

  • Li, Hong;Kang, Tai-Ho
    • Journal of the Korean Institute of Landscape Architecture
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    • v.41 no.6
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    • pp.140-146
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    • 2013
  • This experiment was conducted in order to study the physiological characteristics of Sedum takevimense in different moisture conditions. The photosynthetic rate, water use efficiency and the respiratory rate were determined by using a photable photosynthesis system. According to the results, the best illumination range and moisture range were explicitly selected. The highest photosynthetic rate was at $600{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, and after this value, the trend showed a reduction. When the moisture was 11.31%, the photosynthetic capacity and water use efficiency reached maximum value, but the respiratory rate reached maximum value at 7.91%. According to the measured values, the best illumination range was $600{\sim}1,200{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ and the best moisture range was 7.09~11.31%.

Morpho-Physiological Studies on Elongation of Mesocotyl and Seminal Root in Rice Plant II. Effects of Seed Treatment and Soil Moisture Content on Mesocotyl Elongation (수도 중배축 종근 생장의 형태.생리학적 연구 II. 종자처리와 토양수분이 유묘의 중배축 신장에 미치는 영향)

  • 김진호;이성춘;송동석
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.34 no.4
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    • pp.325-330
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    • 1989
  • This study was undertaken to assess the effects of seed treatment and soil moisture content on mesocotyl elongation in rice seedlings. The effect of the high temperature pre-treatment on the mesocotyl elongation was 7 times as great as the control (non treatment). The mesocotyl lengths were of maximum value at the 8% soil moisture, but of minimum value at the 16% soil moisture plot, showing decreasing trend of mesocotyl length as soil moisture increases. The mesocotyl elongations were much greater at the ABA treated plot than at the GA$^3$, IAA and Kinetin plots. The relationship between the mesocotyl and excised root elongations was not evident, but the weight of excised roots became heavier with longer mesocotyl length.

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