• Title, Summary, Keyword: mixing ratio

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Mechanical Characteristics of Reinforced Soil(I) -Cement Reinforced Soil- (보강 혼합토의 역학적 특성(I) -시멘트 혼합토-)

  • Song, Chang-Seob;Lim, Seong-Yoon
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.5 no.6
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    • pp.9-13
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    • 2002
  • This study has been performed to investigate the physical and mechanical characteristics of compaction, volume change and compressive strength for reinforced soil mixed with cement. And confirm the reinforcing effects with admixture such as cement. To this end, a series of compaction test and compression test was conducted for clayey soil(CL) and cement reinforced soil. In order to determine proper moisture content and mixing ratio, pilot test was carried out for soil and cement reinforced soil. And the mixing ratio of cement admixture was fixed 3%, 6%, 9% and 12% by the weight of dry soil. As the experimental results, the maximum dry unit weight(${\gamma}_{dmax}$) was increased with the mixing ratio and then shown the peak at 10% reinforced soil, but the optimum moisture content(OMC) and the volume change was decreased with the ratio increase. And the compressive strength volume change was decreased with mixing ratio increased.

The Optimal Mixing Ratio for Omi-Galsu Concentrate Production (오미갈수(五味渴水) 원액 제조의 최적 배합 비율)

  • Han, Eun-Sook;Rho, Sook-Nyung
    • Journal of the East Asian Society of Dietary Life
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    • v.18 no.1
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    • pp.29-40
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    • 2008
  • The primary objective of this study was to determine the optimal mixing ratio in preparing Omi-Galsu concentrate. By varying the amounts of Omija extract, mung bean juice, and sugar in the concentrate mixture, we found that pH increased with greater amounts of Omija extract and sugar. According to sensory evaluations, sugar and total free sugar contents were highest when the mixing ratio was 1:1:20%(Omija extract, mung bean juice, and sugar respectively). This ratio also presented the most attractive color and highest overall acceptability.

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High-Grade Characteristics of Solid Refuse using Food Waste Fermentation Product (음식물류 폐기물 분해산물 활용 고형연료 고품위화)

  • Jeong, Cheol Jin;Park, Seyong;Song, Hyoungwoon
    • Journal of Korean Society of Environmental Engineers
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    • v.40 no.9
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    • pp.372-377
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    • 2018
  • In this study, the value of solid refuse fuel was evaluated by using fermentation products generated after processing food wastes with high moisture content by using bio-dying process, and the characteristics of solid refuse fuel production for high-grade production were obtained and analyzed. The highest quality was obtained at 10% rice husk mixing ratio and 5% rice straw mixing ratio, and average density of mixed pellets was $605kg/m^3$. It was concluded that 25% of moisture content of mixed pellets was optimum. As a result of thermogravimetric analysis, rice straw, rice husks and fermentation product were first pyrolyzed. In the order of rice husk mixing ratio 5%, rice straw mixing ratio 10%, rice straw mixing ratio 5% and rice husk mixing ratio 10% proceeded slowly. It was indirectly confirmed that rice straw was slowly pyrolyzed at mixing ratio of 5% and pellet compacting power was the highest. Rice straw was optimal condition for mixing ratio of 5% As a result of comparison between rice husk and rice straw of this study show that rice husk was optimal condition at mixing ratio of 10%. The average higher heating value of pellets was 3,870 kcal/kg, which was 5% higher than that of fermentation products and was more than 3,500 kcal/kg.

A Study on Changes in Pore Water Quality of Polluted Sediment due to Mixing Ratio of Granulated Coal Ash (석탄회 조립물 혼합비율에 따른 오염 퇴적물의 간극수 수질 변화에 관한 연구)

  • Lee, In-Cheol;Woo, Hee-Eun;Kim, Kyeongmin;Lee, Jun-Ho;Kim, Kyunghoi
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.30 no.5
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    • pp.201-206
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    • 2018
  • This study investigated the changes in pore water quality of polluted sediment by mixing ratio of granulated coal ash. The mesocosm experiments were carried out with 0%, 10%, 30% and 50%, respectively, of the material mixture ratio relative to the sediments. According to the results of the experiments, pH increased depending on the mixing ratio. Phosphate and ammonia concentrations were significantly decreased in the mixing ratio of 30% and 50% compared to the control (p < 0.05). The concentration of hydrogen sulfide was reduced by 72% at the mixing ratio of 10%, and it was not detected at the mixing ratio of 30% and 50%. This study was confirmed that granulated coal ash can change the pore water quality of polluted sediments in proportion to the amount of material. However, the effect of the mixing ratio between 30% and 50% was not significantly different, thus it is concluded that mixing of 30% of the volume of the sediment is economically feasible.

Large-Scale Vortical Structures in The Developing Plane Mixing Layer Using LES

  • Seo, Taewon;Kim, Yeung-Chan;Keum, Kihyun
    • International Journal of Aeronautical and Space Sciences
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    • v.2 no.1
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    • pp.12-19
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    • 2001
  • Study of turbulent mixing layers has been a popular subject from the point of view of both practical application and phenomenological importance in engineering field. Turbulent mixing layers can be applied in many fields where rapid transition to turbulence is desirable in order to prevent boundary layer separation or to enhance mixing. The ability to control mixing, structure and growth of the shear flow would obviously have a considerable impact on many engineering applications. In addition to practical applications, free shear flows are one of the simplest flows to understand the fundamental mechanism in the transition process to turbulence. After the discovery of large-scale vortical structure in free shear flows many researchers have investigated the physical mechanism of generation and dissipation processes of the vortical structure. This study investigated the role of the large-scale vortical structures in the turbulent mixing layer using LES(Large-Eddy Simulation). The result shows that the pairing interaction of the vortical structure plays an important role in the growth rate of a mixing layer. It is found that the turbulence quantities depend strongly on the velocity ratio. It is also found that the vorticity in the high-velocity-side can extract energy from the mean flow, while the vorticity in the low-velocity-side lose energy by the viscous dissipation. Finally the results suggest the guideline to obtain the desired flow by control of the velocity ratio.

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Optimum Mixing Ratio of Epoxy for Glass Fiber Reinforced Composites with High Thermal Stability (에폭시 배합비에 따른 내열성 복합재료 최적조건)

  • Shin, Pyeong-Su;Wang, Zuo-Jia;Kwon, Dong-Jun;Choi, Jin-Yeong;Sung, Ill;Jin, Dal-Saem;Kang, Suk-Won;Kim, Jeong-Cheol;Park, Joung-Man
    • Composites Research
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    • v.27 no.4
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    • pp.168-173
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    • 2014
  • The optimum condition of glass fiber/epoxy composites was investigated according to mixing ratio of two epoxy matrices. Novolac type epoxy and isocyanate modified epoxy were used as composites matrix. Based on chemical composition of mixing matrix, optimum mixing ratio of epoxy resins was obtained through various experiments. In order to investigate thermal stability and interface of epoxy resin, glass transition temperature was observed by DSC instrument, and static contact angle was measured by reflecting microscope. Change of IR peak and $T_g$ was conformed according to different epoxy mixing ratio. After fabrication of glass fiber/epoxy composites, tensile, compression, and flexural properties were tested by UTM by room and high temperature. The composites exhibited best mechanical properties when epoxy mixing ratio was 1:1.

Analysis of Paper Qualities and Forming Process at Varied Mixing Ratios of Different Kinds of Recovered Paper (이종 폐지 혼합 비율에 따른 종이 품질 및 초지 공정 변화 분석)

  • Choi, Do-Chim;Lee, Kwang Seob;Kim, Chang Keun;Cho, Byoung-Uk;Ryu, Jeong-Yong
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.46 no.3
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    • pp.28-36
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    • 2014
  • The kind and the mixing ratio of recovered papers would affect the quality of final recycled paper. In this study, effects of the mixing ratio of various domestic recycled papers (old news print (ONP), old corrugated container (OCC) and coated paper (CP)) on variations in physical properties of paper and its productivity were investigated. When the mixing ratio of CP grade increased, the freeness (CSF) of recycled pulp was increased while paper strength and white water turbidity was decreased. Paper strength was decreased as the percentage of OCC was higher than ONP. When ONP was mixed with OCC, no adverse effect was observed except the increased drainage resistance. It is expected that these results could be utilized as fundamental data to establish regulations for the recovered paper grades according to mixing ratios of different kinds of them.

Analysis of Printed Image Depending on Mixing Ratios of Softwood and Hardwood fibers Using Image Analyzer and CLSM (화상분석기와 CLSM을 이용한 침.활엽수 섬유의 배합비에 따른 인쇄화상 분석)

  • 이장호;박종문
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.34 no.3
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    • pp.25-31
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    • 2002
  • The purpose of this study was to analyze how the fiber properties and mixing ratio of softwood and hardwood pulp affect on roundness of printed image. Softwood pulp and hardwood pulp were refined to 400 and 600ml CSF by Valley beater and handsheets of 70 g/$m^2$ basis weight were made at different mixing ratios of hardwood and softwood pulp. The roundness, dot area, and shape of the printed dot were measured by Image Analyzer. The depths and shapes of the acridine orange penetration into paper were measured by CLSM. With higher mixing ratio of hardwood pulp, the paper showed higher air-permeability and better formation, especially at lower freeness. The roundness of the printed image became better and the dot size became smaller when the amount of hardwood pulp increased. Penetration depth of acridine orange by CLSM became greater and roundness increased to real circle when the amount of hardwood pulp increased. It was thought that higher mixing ratio of hardwood fibers resulted in efficient penetration by better formation with uniform micro-pore distribution and it increased roundness. It was thought that fiber properties and mixing ratio affected the structure of paper and the shape of the printed dot. This study showed that the measurement of depth of the liquid penetration into paper without destruction and contact was feasible. Moreover, this method showed that the shape of the liquid penetration was measurable.

A Study On The Engineering Properties of Rammed Aggregate and Sand Mixture Piers (쇄석과 모래 혼합다짐말뚝의 공학적 특성에 관한 연구)

  • Chun, Byung-Sik;Kim, Baek-Young;Do, Jong-Nam;Kuk, Kil-Keun
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.119-122
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    • 2009
  • The gravel compaction pile method has been used as a soft foundation improvement method because bearing capacity and discharge capacity is excellent. But the discharge capacity decreased when the clogging was generated because the clay penetrate into a void of gravel compaction pile. Accordingly, the purpose of this study is to reduce the clogging generation in gravel compaction pile constructing in the soft ground and take a step to minimize a void of gravel compaction pile. And the proper mixing ratio was determined with the large scale direct shear test performed to get strength and permeability with mixing ratio of crushed stone and sand(100:0, 90:10, 85:15, 80:20, 75:25). As a result of the test, it was showed that internal friction angle was the highest at 85:15 mixing ratio of crushed stone and sand and we can make sure a tendency of internal friction angle's decrease when the mixing ratio of crushed stone and sand passed 15%.

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A Study on BER Performance Improvement by using Adaptive FEC schemes in Visible Light Communication (백색 LED기반 가시광 통신시스템의 선택적 FEC 적용을 통한 BER 성능 향상에 관한 연구)

  • Kim, Kyun-Tak;Yun, Suck-Chang
    • Journal of Convergence Society for SMB
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    • v.6 no.4
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    • pp.99-106
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    • 2016
  • In this paper, we propose an adaptive FEC scheme in visible light communication using white LED. To this end, we investigate the red, green and blue mixing ratio of white LED in order to achieve the white color, and the mixing ratio of those wavelength can be defined as 4 types. Based on those properties, the FEC technique is applied to the wavelength band with the lowest mixing ratio according to mixing ratio types. At that point, we use a LDPC channel coding scheme as the FEC technique. Therefore, the proposed system can mitigate the reduction of data rate and improve total BER performance.