• Title/Summary/Keyword: sun-drying

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Effect of polymer adsorption on film formation of silica/PVA suspension

  • Kim, Sun-Hyung;Sung, Jun-Hee;Ahn, Kyung-Hyun;Lee, Seung-Jong
    • Proceedings of the Korea Technical Association of the Pulp and Paper Industry Conference
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    • 2009.10a
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    • pp.79-84
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    • 2009
  • Understanding the polymer adsorption in particle/binder/solvent system is important to achieve successful film products. While most of the reported work has dealt with the suspension microstructure, a few studies have focused on film formation. We investigated the effect of adsorption on film formation through measurement of adsorption amount in suspension and stress development in drying film with respect to mixing time ($t_m$). All of the adsorption amount (PVA), characteristic stress ($\sigma_{ch}$) exhibited similarities expressed by the form of $1-e^{t_m/{\tau}}$. The porous and non-unifonn dried film at short tm became close-packed and uniform with longer $t_m$. We found that polymer adsorption plays the key role in film fonnation as it introduces steric repulsion in suspension and suppresses the flocculation during solvent evaporation. We also found that the mixing time for the saturated polymer adsorption is the important variable to acquire the consolidated and uniform film microstructure.

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Coloration Conditions of Clay Minerals on Cotton Fabrics and Analysis of Components (면포에 대한 점토광물의 착색조건과 착색성분 분석)

  • Jung, Jong Sun;Song, Kyung Hun
    • Journal of the Korean Society of Clothing and Textiles
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    • v.38 no.5
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    • pp.665-674
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    • 2014
  • An analysis of the components of clay mineral before and after coloration (XRF) showed that the elements involved in coloration are Fe, Cr, and Ni. Fe accounts for 65% of coloring components on dyed fabric; in addition, Cr and Ni also affect coloring. The optimal coloration condition was to repeat the process of immersing the cotton fabric in $80^{\circ}C$ slurry of 8g of clay mineral to 1g cotton for 60 minutes, dry it for 24 hours and rinse three times. Especially, as the repetition of coloration increased, the $(K/S)_{440}$ value of sample A increased from 1.0 to 2.5, and sample B increased from 1.0 to 1.6. The effect of the repeated process on coloration was significant; consequently, the rinsing and drying process were important to decrease the coloration level. It also showed excellent results in regard to color fastness to washing, light, rubbing, perspiration, and antibiotic effect.

A Study on the Care Label of Vapor-Permeable and Water-proofed Fabric Clothes and Consumer's Understanding (투습방수포 제품 취급주의표시 레이블의 실태조사와 이에 대한 소비자의 인식조사)

  • Choi, Hae-Young;Lee, Jung-Sun
    • Korean Journal of Human Ecology
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    • v.10 no.4
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    • pp.333-347
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    • 2001
  • The purpose of this study is to find out the washing methods specified on the care labels of vapor-permeable & water-proofed fabrics and to investigate the consumers' real washing methods in their home and their cognition. In this study, the condition of care labels on 35 products was investigated and consumers' washing methods and cognition were surveyed. The subjects were consisted of majoring clothing textiles' female, female student attending in other major and married-women. Data were analyzed SPSS 10.0. The major results were as follows : 1. The care labels of Vapor-permeable & waterproofed fabric products used in this survey followed the rule of KS K that is stated that care labels must include over 3 instructions. It was the most popular type of care labels to organize with washing methods, bleaching methods, weaving methods, drying methods, ironing methods. 2. Most consumers have vapor-permeable & waterproofed fabric products, but their consciousness of this fabric is low. The rate of consumer confirming the care labels was 76.6% but 67.8% of them answered they take care of textile products with their experiences. 3. Consumers' understanding of care instructions on care labels was investigated that most consumers understand domestic care instruction, but they didn't know almost all international one.

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A Study on the Preparation Method and on the Improvement of Damdusi (담두시의 제조방법 확립 및 제조방법 개선에 관한 연구)

  • 이영근
    • Journal of the East Asian Society of Dietary Life
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    • v.13 no.4
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    • pp.313-317
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    • 2003
  • Damdusi was a kind of fermented soybean food added with ginger and sancho(Zanthoxylum schinifolium). To improve the preparing method of Damdusi, Asperillus oryzae was inoculated at steamed soybean and fermented at 25~3$0^{\circ}C$ incubator far 48 hours. Salt, ginger and sancho was mixed into it after 1st fermentation, and the 2nd fermentation was also done at 30~37$^{\circ}C$ for 1 week. After drying under the sun, sancho was removed from it. Dried Damdusi was composed of 4.90% of moisture, 35.07% of crude ash, 13.61% of crude fat and 23.44% of crude protein, respectively. Its flavor earned the high score(3.94) but taste did not (2.98) due to the salty taste by the sensory evaluation. Therefore, salt ratio was reduced to 18%, 16%, and 14% for improving the taste. The one with 14% salt concentration had the highest crude ash and crude fat but the lowest crude protein composition. The crude protein was the highest in the group of 16% salt. By the sensory evaluation, the taste and the overall acceptability was the highest in the 14% salt group.

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Comparison of Enzyme Activity and Micronutrient Content in Powdered Raw Meal and Powdered Processed Meal

  • Chang, Hyun-Ki;Kang, Byung-Sun;Park, Sang-Soon;Lee, Keun-Bo;Han, Myung-Kyu
    • Preventive Nutrition and Food Science
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    • v.8 no.2
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    • pp.162-165
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    • 2003
  • The enzyme activity and the micronutrient content of powdered raw meal (PRM) and powdered processed meal (PPM) were compared. PRM was made of freeze-dried cereals, fruits, and vegetables. PPM was made of the same materials as PRM, but with heat processing such as steaming, roasting and hot air drying. The activity of $\alpha$-amylase of PRM was higher than that of PPM. However there were no differences of the concentration of proximate components between PRM and PPM. The concentrations of vitamin A, C, folic acid, biotin, calcium, potassium, sodium and iron in PRM were higher than in PPM, but there were no differences in vitamins E, B$_1$, B$_2$, phosphorus and zinc. This research demonstrated that PRM retains greater nutritional value because there is higher enzyme activity and less loss of micronutrients during processing in PRM than in PPM.

Mechanical and Drying Shrinkage of Concrete Replaced with Recycled Coarse Aggregate with Less than 13mm in Size (13mm이하 순환 굵은골재 치환에 따른 콘크리트의 역학적 특성 및 건조수축)

  • Lee, Sun-Jae;Kim, Sang-Sup;Park, Young-Jun;Han, Dong-Yeop;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.05a
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    • pp.63-64
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    • 2015
  • This study has analyzed mechanical and dry shrinkage properties according to the recycled coarse aggregate by nominal strength actually being widely used at the Remicon companies for the purpose of qualitative improvement of concrete, practical use and examination at various strengths. As a result, although the modulus of elasticity showed a tendency of getting decreased as the replacement ratio of recycled coarse aggregate has increased, the difference was insignificant while the compressive strength showed a tendency of about 3MPa increase in the recycled coarse aggregate replacement ratio of 30% compared to the ratio of 0%. In case of the dry shrinkage length variation ratio, the recycled coarse aggregate replacement ratio of 30% showed a tendency of about 20% shrinkage reduction compared to the ratio of 0%.

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A Study on the Care Labels of Blue Jeans (청바지의 취급상 주의표시에 관한 연구)

  • 홍지명;신혜원
    • Journal of the Korean Society of Clothing and Textiles
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    • v.22 no.6
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    • pp.716-724
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    • 1998
  • The purpose of this study is to investigate the washing methods specified on care labels of blue jeans and to examine the appropriateness of the specification. In the study, the present condition of care labels on 100% cotton blue jeans was investigated and the consumers' washing methods of blue jeans were surveyed. Also, the shrinkage of blue jeans after washing was measured. The major results were as follows: 1. In spite of the fact that same materials of 100% cotton denim were used in all cases, washing signs on care labels showed very differently and the symbols of hand wash, using light duty detergent, no wring, drying in shade, and warm ironing with a covering cloth were demanding too high level of care for the protection of blue jeans. 2. Almost all consumers didn't follow instructions proposed on care labels because they didn't anticipate problem. In reality, most consumers washed blue jeans by machine in cold water with heavy duty detergent at standard course, dried under the sun, and didn't iron. The 40.8% of consumers didn't have problems even if they didn't follow instructions. Most problems happened after washing were shrinkage in length, but in shrinkage test after 15 times washings, it was found that there was no serious shrinkage problem. 3. For ideal care of blue jean, it is necessary for manufacturers to recognize the importance of care label and to stick correct appropriate care label. Also, consumers have to trust and follow instructions on care label.

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Development of a Drought Detection Indicator using MODIS Thermal Infrared Data

  • Park, Sun-Yurp
    • Korean Journal of Remote Sensing
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    • v.20 no.1
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    • pp.1-11
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    • 2004
  • Based on surface energy balance climatology, surface temperatures should respond to drying conditions well before plant response. To test this hypothesis, land surface temperatures (LST) derived from MODIS data were analyzed to determine how the data were correlated with climatic water balance variables and NDVI anomalies during a growing season in Western and Central Kansas. Daily MODIS data were integrated into weekly composites so that each composite data set included the maximum temperature recorded at each pixel during each composite period. Time-integrated, or cumulative values of the LST deviation standardized with mean air temperatures had significantly high correlation coefficients with SM, AE/PE, and MD/PE, ranging from 0.65 to 0.89. The Standardized Thermal Index (STI) is proposed in this study to accomplish the objective. The STI, based on surface temperatures standardized with observed mean air temperatures, had significant temporal relationships with the hydroclimatological factors. STI classes in all the composite periods also had a strong correlation with NDVI declines during a drought episode. Results showed that, based on LST, air temperature observations, and water budget analysis, NDVI declines below normal could be predicted as early as 8 weeks in advance in this study area.

Investigation of Physicochemical Properties of Safflower Sprouts Grown Different Wavelengths of Visible Light and Treated with Different Drying Processes (다른 광원 조사로 재배된 홍화새싹의 건조 방법별 이화학적 특성)

  • Choi, Mi-Kyeong;Chang, Moon-Sik;Eom, Seok-Hyun;Jung, Uk-Sun;Kang, Myung-Hwa
    • Korean journal of food and cookery science
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    • v.29 no.6
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    • pp.717-724
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    • 2013
  • Physicochemical properties of safflower sprouts grown in there different lights red, blue, and white; control exposed to limited light and subjested to different drying processes were investigated. Moisture contents of safflower sprouts grown different lights and treated with hot dry air were as follows: 9.38%(white light), 5.70%(blue light), 12.21%(red light), and 7.84%(control; no light). The moisture contents of freeze-dried safflower sprouts were as follow as: 9.95%(white light), 11.30%(blue light), 11.25%(red light), and 10.45%(control). Crude ash contents of the hot air-dried sprouts were as follows: 4.82%(white light), 12.22%(blue light), 4.33%(red light), and 6.30%(control). The crude ash contents of freeze-dried safflower sprouts were as follow as: 4.75%(white light), 4.44%(blue light), 4.00%(red light), and 3.65% (control). Crude protein contents of hot air-dried safflower sprouts were as follows: 16.52%(white light) 15.40%(blue light), 14.55%(red light), and 15.46%(control). The crude ash contents of freeze-dried safflower sprouts were as follows: 25.19%(white light), 15.72%(blue light), 25.53%(red light), and 20.13%(control). Chlorophyll contents of hot air-dried and freeze-dried safflower sprouts were higher than those of only freeze-dried sprouts. b-values of freeze-dried sprouts were lower than those of sprouts dried by other dried methods. The contents of minerals Ca, Mg, Na, P and K in all the sprout samples remains unchanged regardless of the drying methods.

Changes of Ginsenosides and Physiochemical Properties in Ginseng by New 9 Repetitive Steaming and Drying Process (새로운 자동 구증구포방법에 의한 인삼사포닌의 변환 및 이화학적 특성)

  • Jin, Yan;Kim, Yeon-Ju;Jeon, Ji-Na;Wang, Chao;Min, Jin-Woo;Jung, Sun-Young;Yang, Deok-Chun
    • Korean Journal of Plant Resources
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    • v.25 no.4
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    • pp.473-481
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    • 2012
  • This study was conducted to investigate the contents of ginsenosides and physiochemical properties of Panax ginseng after 9 times steaming and drying treatment by using the new auto steamer which is more fast and simple than previous report. In the process of steaming and drying, the content of six major ginsenosides such as Rg1, Re, Rb1, Rc, Rb2 and Rd were gradually decreased. On the other hand, the content of seven minor ginsenosides includes Rh1, 20(S)-Rg2, 20(R)-Rg2, 20(S)-Rg3, 20(R)-Rg3, Rk1 and Rg5 were gradually increased. We observed the protopanxadiol ginsenosides such as Rb1, Rb2, Rc and Rd were converted into 20(S)-Rg3, 20(R)-Rg3, Rk1 and Rg5; similarly protopanxatriol ginsenosides of Rg1 and Re were converted into Rh1, 20(S)-Rg2 and 20(R)-Rg2. Based on the result of fresh ginseng, the contents of reducing sugar, acidic polysaccharide and total phenolic compounds were gradually increased and reached to maximum at 7 times repetitive steaming process of the fresh ginseng. Whereas DPPH radical scavenging activities were gradually decreased to 68% at 7 times steaming. New auto 9 repetitive steaming and drying process has similar production with original methods, but content of benzo(a)pyrene were not almost detected comparatively taking less time. The present results suggested that this method is best for the development of value-added ginseng industry related products.