• Title/Summary/Keyword: High-yield process

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Controlled Hydrodynamic Cavitation-assisted Nanoreactor for Less Chemical-Higher Yield in Neutralization of Vegetable Oil Refining Process (Less Chemical-Higher Yield 탈산공정을 위한 수력 공동현상 유도 나노리엑터)

  • Kim, Ji-In
    • Food Science and Industry
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    • v.51 no.2
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    • pp.114-126
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    • 2018
  • The production of high quality oil to meet new standard needs a 'next generation' innovative oil refining tool in paradigm shift. 'Nanoneutralization' using controlled hydrodynamic cavitation-assisted Nanoreactor is successfully being introduced and commercialized into edible oil industry and it plays a key driver for sustainable development of food processing. This emerging technology using bubble dynamics as a consequence of Bernoulli's principle by hydrodynamic cavitation in Venturi-designed multi-flow through cell is radically changing the conventionally chemical-oriented neutralization. Nanoneutralization derived by the creation of nanometer-sized bubbles formed through scientifically structured geometric channels under high pressure has been proven to improve mass transfer and reaction rate so substantially reduce the chemicals required for refined vegetable oil and to increase oil yield while even improving oil quality. More researches on science behind this revolutionary technology will help usto better understand the principle and process hence makes its potential applications expandable in extraction, refining and modification of fats and oils processing.

Analysis on Deformation Behavior of High Strength Steel using the Finite Element Method in Conjunction with Constitutive Model Considering Elongation at Yield Point (항복점연신이 고려된 유한요소 해석을 통한 고강도강의 변형 거동 연구)

  • Yoon, Seung Chae;Moon, Man Been;Kim, Hyoung Seop
    • Korean Journal of Metals and Materials
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    • v.48 no.7
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    • pp.598-604
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    • 2010
  • Tensile tests are widely used for evaluating mechanical properties of materials including flow curves as well as Young's modulus, yield strength, tensile strength, and yield point elongation. This research aims at analyzing the plastic flow behavior of high strength steels for automotive bodies using the finite element method in conjunction with the viscoplastic model considering the yield point elongation phenomenon. The plastic flow behavior of the high strength steel was successfully predicted, by considering an operating deformation mechanism, in terms of normalization dislocation density, and strain hardening and accumulative damage of high strength steel using the modified constitutive model. In addition, the finite element method is employed to track the properties of the high strength steel pertaining to the deformation histories in a skin pass mill process.

Effect of TempCore Processing on Microstructure and Mechanical Properties of 700 MPa-Grade High-Strength Seismic Resistant Reinforced Steel Bars (700 MPa급 고강도 내진 철근의 미세조직과 기계적 특성에 미치는 템프코어 공정의 영향)

  • Shin, S.H.;Kim, S.K.;Lim, H.G.;Hwang, B.
    • Transactions of Materials Processing
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    • v.30 no.2
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    • pp.91-98
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    • 2021
  • The present study deals with the microstructure and mechanical properties of 700 MPa-grade high-strength seismic resistant reinforced steel bars fabricated by various TempCore process conditions. For the steel bars, in the surface region tempered martensite was formed by water cooling and subsequent self-tempering during TempCore process, while in the center region there was ferrite-pearlite or bainite microstructure. The steel bar fabricated by the highest water flow and the lowest equalizing temperature had the highest hardness in all regions due to the relatively fine microstructure of tempered martensite and bainite. In addition, the steel bar having finer microstructures as well as the high fraction of tempered martensite in the surface region showed the highest yield and tensile strengths. The presence of vanadium precipitates and the high fraction of ferrite contributed to the improvement of seismic resistance such as high tensile-to-yield strength ratio and high uniform elongation.

Development and Evaluation of the Characteristics of Porous Materials for a Mold (금형 소재용 다공질 재료의 개발과 특성 평가)

  • 박선준;정성일;임용관;정해도;이석우;최헌종
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.6
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    • pp.35-42
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    • 2004
  • At the large-sized mold fer injection molding, the remaining gas in the mold causes some problems with final products. In order to solve these problems, air-bent was drilled on the surface of mold. However, this method leaves the scar on the surface of a product. Therefore, porous material was developed to the removal of remaining gas in this study. Porcerax II, which is a commercialized porous material, were developed in USA. It requires the electric discharge machining(EDM) process to make pores on the surface of the materials. The electric discharge machining (EDM) process, however, cause the increase of the time and cost for the fabrication of the mold. In this study, high speed machining(HSM) process was applied to the fabrication of porous mold without electric discharge machining(EDM) process. Some characteristics of the developed materials machined by high speed machining(HSM) and electric discharge machining(EDM) including air-permeability and porosity were compared with those of Porcerax II. Besides, in order to be applied to the molding process, hardness and tensile & yield strength were compared between Porcerax II and developed materials.

Study for Structural Stabilities at High Temperatures of Beams Built with TMC Fire Resistant Steels (TMC 건축용 내화강재 적용 단순 보부재의 고온 거동에 관한 기초 연구)

  • Kwon, In-Kyu
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.10a
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    • pp.60-61
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    • 2016
  • Performance has been developed in terms of structural strength. Especially, in a structural steels, it is regarded as a common design process that an yield stress of thicker plate than 40mm uses that of below 40mm in thickness. This can be done using TMCP(Thermo mechanical control process). In this study, the structural stabilities such as deflection, maximum load carrying capacity would be calculated in high temperatures.

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High Speed Zinc Coating by EML-PVD Process (EML-PVD를 이용한 고속 Zn 코팅)

  • Jeong, U-Seong;Nam, Gyeong-Hun;Eom, Mun-Jong;Kim, Tae-Yeop
    • Proceedings of the Korean Institute of Surface Engineering Conference
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    • 2012.05a
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    • pp.277-277
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    • 2012
  • New concept of coating process, which is called Electro Magnetic Levitation-Physical Vapour deposition (EML-PVD) was developed and investigated. Zinc coating was performed and succeeded for the first time on the steel strip (Cold-rolled Steel) in a continuos pilot line using the EML-PVD process which is specialized in the high deposition rate and high vapor yield. EML-PVD will be expected to be the next generation coating technology to be applied to the steel industry.

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Asymmetric Yield Functions Based on the Stress Invariants J2 and J3(II) (J2 와 J3 불변량에 기초한 비대칭 항복함수의 제안(II))

  • Kim, Y.S;Nguyen, P.V.;Ahn, J.B.;Kim, J.J.
    • Transactions of Materials Processing
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    • v.31 no.6
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    • pp.351-364
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    • 2022
  • The yield criterion, or called yield function, plays an important role in the study of plastic working of a sheet because it governs the plastic deformation properties of the sheet during plastic forming process. In this paper, we propose a modified version of previous anisotropic yield function (Trans. Mater. Process., 31(4) 2022, pp. 214-228) based on J2 and J3 stress invariants. The proposed anisotropic yield model has the 6th-order of stress components. The modified version of the anisotropic yield function in this study is as follows. f(J20,J30) ≡ (J20)3 + α(J30)2 + β(J20)3/2 × (J30) = k6 The proposed anisotropic yield function well explains the anisotropic plastic behavior of various sheets such as aluminum, high strength steel, magnesium alloy sheets etc. by introducing the parameters α and β, and also exhibits both symmetrical and asymmetrical yield surfaces. The parameters included in the proposed model are determined through an optimization algorithm from uniaxial and biaxial experimental data under proportional loading path. In this study, the validity of the proposed anisotropic yield function was verified by comparing the yield surface shape, normalized uniaxial yield stress value, and Lankford's anisotropic coefficient R-value derived with the experimental results. Application for the proposed anisotropic yield function to AA6016-T4 aluminum and DP980 sheets shows symmetrical yielding behavior and to AZ31B magnesium shows asymmetric yielding behavior, it was shown that the yield locus and yielding behavior of various types of sheet materials can be predicted reasonably by using the proposed anisotropic yield function.

Research of the Composite Spun Yarn Manufacturing Process using Silicon Carbide and Para Aramid Fiber (SiC/p-Aramid 복합방적사 제조기술 연구)

  • Kim, Booksung;Ryu, Huijun
    • Textile Coloration and Finishing
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    • v.33 no.4
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    • pp.309-316
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    • 2021
  • Due to the rigid nature of the silicon carbide fiber(SiC), fiber damage occurs from the friction during the carding process. This damage not only lowers the spun yarn yield, but also lowers the heat resistance of the spun yarn, so that ultra-high heat resistant yarn cannot be manufactured. Therefore, in the carding process where the most friction between fiber and machine(wire, etc.) occurs, some factors were modified and tested, and as a result of measuring the change in physical properties, fiber damage decreased due to the wire angle or wire density, resulting in improved yield. The test method used to measure the yield of SiC fiber was the carbonization method, and the content of SiC fibers was calculated using the remaining amount after carbonization. Carbonization test was performed at air condition, 700℃, and for 2 hours. Analysis by SEM-EDX showed that the carbide was consistent with the composition of the SiC fiber.

Preparation and Characterization of ACF Using Lyocell Adopting Surface Modification Process (리오셀 표면개질공정을 도입한 ACF 제조 및 특성)

  • Jo, Young Hyuk;Jin, Young Min;Lee, Soon Hong
    • Journal of the Korean Society of Safety
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    • v.31 no.1
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    • pp.66-73
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    • 2016
  • Lyocell fibers were used as a precursor in order to improve yield and strength of cellulose-based precursor while manufacturing activated carbon fiber(ACF). Lyocell fibers as a precursor for the preparation of ACF were surface-modified by reaction with 3-aminopropyltriethoxysilane(APTES) and pre-treated with KOH and H3PO4. Using aforementioned precursor, ACFs were prepared by a series of stabilization, carbonization and activation process at high temperatures. On each process, FT-IR, TGA, UTM and SEM were used to observe fibers' physical properties including structure and porous surfaces. FT-IR results proved that surface modification was achieved during stabilization, carbonization and activation process. TGA results during carbonization process found that surface modified fibers with APTES 0.02 mol(A2) showed higher thermostability, and extended pre-treatment increased yield. Especially, yield was found to have an increase of 10~20 wt% with surface modification during activation process. UTM results showed that tensile strength has the same order of concentration of APTES after surface modification, however, was found to show lower tensile strength than lyocell fibers after stabilization process. SEM results revealed that more homogeneous porosity control could be proceed after modifying the surface for the effective removal of hazardous substances.

Yield Response of Soybean [Glycine max (L.) Merrill] to High Temperature Condition in a Temperature Gradient Chamber

  • Baek, Jae-Kyeong;Sang, Wan-Gyu;Kim, Jun-Hwan;Shin, Pyong;Cho, Jung-Il;Seo, Myung-Chul
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.65 no.4
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    • pp.339-345
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    • 2020
  • Recently, abnormal weather conditions, such as extreme high temperatures and droughts, have increased in frequency due to climate change, there has accordingly been growing concern regarding the detrimental effects on field crop, including soybean. Therefore, this study was conducted to examine the effects of increased temperatures on soybean growth and yield using a temperature gradient chamber (TGC). Two major types of soybean cultivar, a medium- seed cultivar such as Daepung-2 and a large-seed cultivar such as Daechan, were used and four temperature treatments, aT+1℃ (ambient temperature+1℃), aT+2℃ (ambient temperature+2℃), aT+3℃ (ambient temperature+3℃) and aT+4℃ (ambient temperature+4℃) were established to examine the growth response and seed yield of each cultivar. Seed yield showed a higher correlation with seed weight (r=0.713***) and an increase in temperature affected seed yield by reducing the single seed weight. In particular, the seed growth rate of the large-seed cultivar (Daechan) increased at high temperature, resulting in a reduction in the number of days for full maturity. Our results accordingly indicate that large-seed cultivar, such as Daechan, is potentially vulnerable to high temperature stress. The results of this study can be used as basic data in the development of cultivation technology to reduce the damage caused by elevated temperatures. Also, further research is required to evaluate the response of each process contributing to seed yield production under high temperatures.