• Title/Summary/Keyword: modified atmosphere

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Effects of Atmospheric Powder and Grain Size on Electrical Properties of Lanthanum-modified $PbTiO_3$ Ceramics

  • Byung Sung kang;You, Dong-Joo;Park, Si-Kyung
    • The Korean Journal of Ceramics
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    • v.6 no.4
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    • pp.396-400
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    • 2000
  • Dielectric and piezoelectric properties of Pb$_0.9$La$_0.1$TiO$_3$ ceramics were investigated as a function of grain size. Sintering atmosphere was controlled with changing the kind of atmospheric powder and its amount. It was confirmed that dielectric and piezoelectric of Pb$_0.9$La$_0.1$TiO$_3$ were strongly influenced by the sintering atmosphere. Relative dielectric constant of Pb$_0.9$La$_0.1$TiO$_3$ which was sintered in PbO-deficient atmosphere made by Pb$_0.9$La$_0.1$TiO$_3$ powder, increased with the grain size. However, the dielectric constant of the samples sintered in the PbO-sufficient atmosphere made by PbZrO$_3$ powder was slightly decreased with the grain size. Piezoelectric d$_33$ constant of Pb$_0.9$La$_0.1$TiO$_3$ also showed a different trend, depending on the sintering atmosphere. It was almost constant in the range of grain size of 1.3~2.3 $\mu$m when the samples were sintered in the PbO-sufficient atmosphere, while it intensively decreased with the grain size in the case of the PbO-deficient condition.

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Effects of MA Storage with Fine Holes For Red Chili Pepper and Red Bell Pepper Fruits (홍고추 및 홍피망의 미세공 MA저장 효과)

  • 이귀현;정천순
    • Food Science and Preservation
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    • v.8 no.2
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    • pp.125-130
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    • 2001
  • The effects of modified atmosphere(MA) storage for fresh red chili pepper and red bell pepper fruits were investigated with storing in polyethylene film with various fine holes. During the storage of the both pepper fruits, the weight loss, color change, mold emergence, and firmness were evaluated. The weight loss of pepper fruits packaged without holes on film was less than 3%, even though it was each 50% and 25% for non packaged red chili pepper and red bell pepper fruits. The rates of mold emergence of red chili pepper and red bell pepper fruits were reached to each 60% and 50% at the end of storage period as stored in film without holes. However, the rate of mold emergence of pepper fruits was lowered when fruits were stored in MA with low relative humidity (70∼80%). The color and firmness of pepper fruits were not much changed when fruits were stored in MA with high humidity.

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Effect of Packaging on Keeping Quality of Fresh Ginseng (수삼의 저장성에 미치는 포장의 영향)

  • Gwon, Ho-Ryeong;Lee, Seung-Cheol;Lee, Dong-Seon
    • Food Science and Preservation
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    • v.1 no.2
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    • pp.93-98
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    • 1994
  • Fresh ginseng was packed by using available commercial plastic films of polyvinyl chloride (PVC), cast polypropylene (CPP) and low density polyethylene (LDPE). PVC was used as a wrapping on polystyrene tray, and CPP and LDPE were applied as pouch packages. Gas composition of the package and keeping quality of ginseng in the packages were evaluated for 20 day storage at 5$^{\circ}C$. LDPE (27$\mu\textrm{m}$ thick) Package modified the Package atmosphere to 11.7% O2 and 2.1% CO2, gave low microbial growth and good sensory score after 20 day storage.

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Superchilling and Packaging Technology for High-quality Perishable Food Distribution: A Review (고품질 수산가공품유통을 위한 슈퍼칠링과 패키징기술에 대한 고찰)

  • Yang, Su-jung;Choi, Seok;Kim, Jongkyoung
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.24 no.3
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    • pp.159-165
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    • 2018
  • This review outlines the past and current technology development and research trends on the superchilling technic along with packaging technology such as modified atmosphere packaging. A superchilling technic combined with appropriate packaging technologies such as Modified Atmosphere Packaging is beneficial and promising for fish and meat products in terms of freshness and shelf-life extension although there are many barriers for commercialization such as temperature control throughout supply chain.

Development of Modified Atmosphere Packaging for Scallop (세계의 포장 - 가리비 조개 선도유지에 탁월한 EPS상자 개발)

  • 한국발포스티렌재활용협회
    • 환경사랑
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    • s.55
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    • pp.6-7
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    • 2009
  • 수산물 EPS상자의 용도가 날로 확대되는 가운데 일본 아오모리현 수산 종합연구센터 증양식 연구소는 가리비 조개의 선도유지를 위한 EPS상자를 개발했다. <월간 포장계> 2009년 2월호에 소개 된 개발 용기 내용을 요약했다.

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