• 한국식품저장유통학회지
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• 제22권3호
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• pp.385-391
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• 2015

부추를 활용한 가용성 분말 제조에 적합한 공정 개발의 일환으로, 부추원료의 증숙처리 유무와 착즙액의 분무건조 부형제 종류에 따른 분말제품의 품질특성을 조사하였다. 생부추를 세척, 탈수, 절단 후 증숙처리($100^{\circ}C$, 3분)하거나 무처리한 다음 착즙하여 액을 얻고 여기에 부형제로 dextrin(DE=10)이나 ${\beta}$-cyclodextrin를 5% 첨가하고 분무건조하여 분말을 각각 제조하였다. 부추의 증숙처리는 착즙액 분무건조 분말의 $L^*$값은 높게 하였지만 $-a^*$값, $b^*$값, $C^*$값, $h^o$값은 낮게 하는 효과를 보였다. 분말의 수분함량과 수용성지수는 증숙처리와 부형제의 영향을 받지 않았지만, 입자크기는 증숙처리와 dextrin 첨가구에서 가장 적은 것으로 나타났다. 분말의 클로로필, 총페놀, 비타민 C 함량은 증숙처리구보다 무처리구에서 유의적으로 높은 수준을 보였으나 부형제 종류별로는 유의적인 차이를 보이지 않았다. DPPH 유리기 소거능은 증숙처리에 의해 낮아지며 무처리구에서는 ${\beta}$-cyclodextrin 첨가구가 다소 높은 경향을 보였다. 증숙처리구의 관능적 색, 냄새, 종합 기호도는 무증숙처리구보다 유의적으로 높게 평가되었으며 부형제의 영향은 크게 보이지 않았다. 이로써 부추 착즙액의 분무건조 분말의 품질은 착즙 전 증숙처리의 영향을 크게 받는 것으로 확인되었고, 부추 고유의 이화학적 품질 특성유지에는 무처리가, 관능적 기호도를 고려할 경우에는 증숙처리가 유효한 방법으로 판단되었다.

• 전기학회논문지P
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• 제58권4호
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• pp.526-531
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• 2009

This paper suggests the dehydration and RDF(Refuse Derived Fuel) production of organic sludge, livestock manure and sewerage sludge causing environmental problems, with hydrothermal pre-treatment process. The renewable technology from the organic wastes must involve short treatment time required, reusable energy source, anti-odor and viruses, low cost for the treatment, and well-fertilization. The hydrothermal pre-treatment process promotes to evaporate moisture in the sludge after being shortly treated in a reactor, which is supplied steam and heat by an external boiler, due to the pressure with steam breaks the cell walls of the sludge, so this process removes the internal moisture of the cell. Then, the treated sludge(solid-state) is mixed with waste vinyls called RDF(6,706kcal/kg).

• 한국수소및신에너지학회논문집
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• 제20권5호
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• pp.439-446
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• 2009

This paper investigates the dehydration and RDF (Refuse Derived Fuel) production of organic wastes, livestock manure and sewerage sludge with pressurized hydrothermal treatment process. The renewable technology for the organic wastes must involve short treatment time required, reusable energy source, anti-odor and viruses, low cost for the treatment, and well-fertilization. The pressurized hydrothermal treatment process promotes to evaporate moisture in the waste after being shortly treated in a reactor, which uses steam and heat supplied by an external boiler. By the pressurized steam, the cell walls of the waste break and effectively release the internal moisture. Then, the dried waste can be mixed with waste vinyls to produce RDF with a higher heating value as high as 6,700 kcal/kg.

• Biotechnology and Bioprocess Engineering:BBE
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• 제8권3호
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• pp.179-182
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• 2003

Anaerobic fermentation was attempted to produce methane from the wood chip (Eucalyptus globulus). By the pretreatment of the wood chip using hot water with high temperature, NaOH, and steam explosion, the production of methane gas was enhanced. The pretreatment using Steam explosion resulted in more amount of methane gas produced than the treatment using either hot water or 1% (w/w) NaOH with high temperature, and the steam explosion at a steam pressure of 25 atm and a steaming time of 3 min was the most effective for the methane production. The amount of methane gas produced depended on the ratio of weight of Klason lignin, a high molecular weight lignin, in the treated wood chip.

• 한국수소및신에너지학회논문집
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• 제22권4호
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• pp.546-551
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• 2011

The corrosion on steam generator tubes of the secondary side of pressurized water reactor inhibits heat transfer. One of the most efficient techniques improving the heat transfer performance of a nuclear electric generation is a corrosion control. The environmental parameters mostly affecting corrosion are materials and chemical additives. It seems that no further corrosion occurs in steels with Polyacrylic acid polymer dispersant treatment. Polyacrylic acid forms a protective coating with uniform thickness on metal surface. Polyacrylic treatment appears to be the most convenient way to enhance the thermal performance by the thermal conductivity improvement in steam generators.

• Journal of the Korean Wood Science and Technology
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• 제23권1호
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• pp.54-60
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• 1995

This paper reports on the changes of equilibrium moisture contents and specific surface areas of Poplar wood(Populus euramericana) for various steam explosion treatments. Equilibrium moisture contents(EMC) and specific surfaces of steam exploded woods were measured under the moisture adsorption course at 25$^{\circ}C$, and compared with those of other materials and wood meals. The EMCs of steam exploded wood meal were 1~5% less in comparison with that of wood meal. In the case of delignified steam exploded wood meal and delignified wood meal, the same tendency was appeared too. But absolute values of EMCs for delignified wood meals were larger than those of the wood meal. For the changes of EMC by the steam exploded conditions, the EMC decreased with the increase of the steam explosion pressure. On the other hand, specific surface areas were calculated from BET plots based on amounts of monomolecular vapor adsorption of various wood meals. Specific surface areas of the wood meal and delignified wood meal were 90~145, 34~90($m^2/g$) respectively, and which were greater in comparison with those of steam exploded wood meals and delignified steam exploded wood meals. From these results, it is considered that the amount of water vapor adsorption was decreased by the increase of the crystallinity, effect of heat treatment, and coating by melted lignin in during the steam explosion.

• Journal of the Korean Wood Science and Technology
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• 제42권5호
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• pp.543-554
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• 2014

Natural plant extract has been the subject of intense research aiming in elucidating the underlying mechanisms of their chemopreventive effects upon various forms of human cancers. The objective of our study was to evaluate the natural antioxidants and anticancer agent potential of Phyllostachys. The chemical composition of steam extract from Phyllostachys was carried out using GC-MS. The steam extract of Phyllostachys was dominated by monoterpenes (62.96% - 71.36%) and sesquiterpenes (23.58% - 33.13%) as the main compounds. The antioxidant activities of the steam extract was determined using a DPPH scavenging and hydrogen peroxide scavenging activity test systems. Furthermore, the amounts of total phenolics in steam extract were determined spectrometrically The steam extract of P. pubescens and P. bambusoides were presented the high activity (69.4% and 64.0%, respectively.). The steam extract from Pyllostachys species showed a hydrogen peroxide scavenging activity of approximately 50.4% - 54.6% when compared to that of the standard gallic acid. The anticancer activities of steam extract were determined using a MTT assay. Assessment of the cytotoxic effect of the steam extract on PC-3 cells showed that the P. bambusoides (20.85%) and P. pubescens (20.41%) were superior in induced cytotoxicity compared with the steam extract of P. nigra var. henonis (1.15%). Findings from this study indicated that steam extract of P. bambusoides and P. pubescens possessed potential as medicinal drug especially in prostate cancer treatment.

• 한국기계가공학회지
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• 제9권6호
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• pp.59-65
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• 2010

This study deals with the characteristic of refrigerant for heat-treatment deformation control of SCM415 steel. The control of heat-treatment deformation must need the progress of production parts for an industry machine. Most of the deformation is occurred on unequal cooling. The unequal cooling is occurred by a property of quenching refrigeration. When a heated metal is deposited in the refrigeration, the cooling speed is so slow in early period of cooling because of occurring a steam-curtain. After more cooling, the steam-curtain is destroyed. In this progress, the cooling speed is very fast. The object of this study is to control the deformation of heat-treatment for the part of the industry machine by improving the conditions of quenching. The cooling curves and cooling rates of water, oil and polymer solution are obtained and illustrated. From the characteristics of the quenching refrigerant, the effects of heat-treatments on the thermal deformation and fatigue strength are also investigated.

• Journal of Mechanical Science and Technology
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• 제16권5호
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• pp.647-654
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• 2002

This study deals with the characteristic of quenching refrigerant for heat treatment deformation control of SM45C steel. Heat-treatment deformation must be controlled for the progress of production parts for landing gear. Most of deformation is occurred on inconsistent cooling. The inconsistent cooling is caused by a property of quenching refrigerant. When a heated metal is deposited in the quenching refrigerant, the cooling speed is so slow in early period of cooling because of a steam-curtain. After additional cooling, the steam-curtain is destroyed. In this progress, the cooling speed is very fast. The object of this study is to control the deformation of heat-treatment for landing gear by improving the conditions of quenching. The cooling curves and cooling rates of water, oil and polymer solution are obtained and illustrated. From the characteristics of the quenching refrigerant, the effects of heat-treatments on thermal deformation and fatigue strength are also investigated.

• Journal of the Korean Wood Science and Technology
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• 제29권4호
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• pp.9-15
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• 2001

본 연구는 $100^{\circ}C$ 이상의 고온영역에서 증기처리에 의한 소나무(Pinus densiflora)재와 라디아타소나무(Pinus radiata)재의 전단강도를 조사하였다. 본 연구에서 사용한 열처리 조건은 온도조건 $100^{\circ}C$부터 $200^{\circ}C$까지 $20^{\circ}C$ 간격으로 6조건과 시간조건 5, 10, 20, 30분의 4조건이었으며, 폭쇄처리기를 사용하였다. 고온에서 증기처리에 의해 목재구성요소의 감소가 전단강도의 감소로 나타나고 목질재료의 광범위한 가소화를 진행시키는 것으로 판단된다. 목재의 전단강도는 증기처리시간에 따라서 점차적으로 감소한다는 것을 알 수 있었다. 10분 이상의 증기처리시간일 경우 온도가 올라갈수록 전단강도의 감소가 눈에 띄게 커졌다. 고온에서 증기처리에 의한 연화는 목재가공성 향상에 필요하다고 생각된다.