• Title, Summary, Keyword: Recyclable

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A Study on the Recycle and Reuse Suitability Environmenttal Furniture Design - Design Of Street Furniture with Maneking - (재사용 및 재활용에 적합한 환경가구디자인에 관한 연구 - 마네킹(Maneking)을 이용한 스트리트 퍼니처(Street Furniture) 디자인을 중심으로 -)

  • Lee, Min-Ho
    • Journal of the Korea Furniture Society
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    • v.17 no.1
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    • pp.47-54
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    • 2006
  • This study focused on designing environment-friendly furnitures by recycling useless stuffs. I designed environment-friendly furnitures by using plastic manekings, which do not decay easily. Designing environment-friendly furnitures by using maneking, we should consider the following; to make our surrounding comfortable and pleasant, to make the appearance of the streets more beautiful, and to consider our future environment. We need to use reusable and recyclable wastes much more to make environment-friendly furnitures from now on.

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Value-added Polyolefin Products

  • Ok, Myung-Ahn
    • Proceedings of the Polymer Society of Korea Conference
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    • pp.152-152
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    • 2006
  • Polyolefins show a very healthy growth rate among commodity polymer resins due to their low feedstock prices, recyclable and environmentally friendly characteristics and easily controllable performances. Capacity investment in polyolefin field is now moving from technology region to consumer region and feedstock region. Therefore, key success factors for polyolefin business in the other region such as Korea are cost reduction, development of highly value-added products and new applications and substitution of PVC, PS, PET and other EPs. To add additional value to commodity polyolefin products, high level of platform technology such as catalyst, process and structure-properties relationship is needed. Progress on polyolefin products has been very closely related to catalyst and process technology. According to this trend, SK Corporation has devoted a lot of research effort into development of new value-added polyolefin products based on the proprietary technology platform.

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A Study on the proposal of Strength Presumption Equation of Concrete Using Admixture by Nondestructive Testing (비파괴 시험에 의한 혼화재를 사용한 콘크리트의 강도 추정식 제안에 관한 연구)

  • Kim Jeong-Sup;Shin Yong-Seok;Kim Koung-Ok
    • Journal of the Korea Institute of Building Construction
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    • v.6 no.3
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    • pp.59-66
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    • 2006
  • This study aims to estimate strength approximate to actual concrete strength by presenting appropriate non-destructive strength estimation expression with admixtures such as fly ash, blast furnace slag and silica fume which are used as cement substitute and owing to theirs of cement owing to their equal conditions to blending characteristics of concrete used for domestic structures and their recyclable properties. As a result of comparing error rate of existing expressions and this estimation expression, error rate of this estimation is reduced compared to existing expressions and has higher reliability. When conventional concrete expression is applied to admixture concrete, error rate occurs and then this study suggests the following estimation expressions depending on types of admixture concrete.

Silica Gel-Supported Polyphosphoric Acid (PPA-SiO2) Catalyzed One-Pot Multi-Component Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones and -thiones: An Efficient Method for the Biginelli Reaction

  • Zeinali-Dastmalbaf, Mohsen;Davoodnia, Abolghasem;Heravi, Majid M.;Tavakoli-Hoseini, Niloofar;Khojastehnezhad, Amir;Zamani, Hassan Ali
    • Bulletin of the Korean Chemical Society
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    • v.32 no.2
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    • pp.656-658
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    • 2011
  • A green and efficient method for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones and -thiones through one-pot three-component reaction of ethyl acetoacetate, an aryl aldehyde, and urea or thiourea in acetonitrile using silica gel-supported polyphosphoric acid (PPA-$SiO_2$) as catalyst is described. Compared to the classical Biginelli reaction conditions, the present methodology offers several advantages such as high yields, relatively short reaction times, mild reaction condition and a recyclable catalyst with a very easy work up.

Fe/Al-MCM-41: An Efficient and Reusable Catalyst for the Synthesis of Quinoxaline Derivatives (Fe/Al-MCM-41: Quinoxaline계 화합물의 효율적인 합성)

  • Heravi, Majid. M.;Hosseini, Mariam;Oskooie, Hossein A.;Baghernejad, Bita
    • Journal of the Korean Chemical Society
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    • v.55 no.2
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    • pp.235-239
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    • 2011
  • Fe/Al-MCM-41was found to be an effective catalyst for the synthesis of quinoxaline derivatives from the condensation of the 1,2-diamines and 1,2-dicarbonyl compounds in good yields. The catalyst is recyclable and reusable.

Carbon-Based Solid Acid as an Efficient and Reusable Catalyst for the Synthesis of 1,8-Dioxodecahydroacridines Under Solvent-Free Conditions

  • Davoodnia, Abolghasem;Khojastehnezhad, Amir;Tavakoli-Hoseini, Niloofar
    • Bulletin of the Korean Chemical Society
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    • v.32 no.7
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    • pp.2243-2248
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    • 2011
  • Carbon-based solid acid catalyst was found to be highly efficient, eco-friendly and recyclable heterogeneous catalyst for the multicomponent reaction of dimedone, aromatic aldehydes, and a nitrogen source (ammonium acetate or aromatic amines) under solvent-free conditions, giving rise to 1,8-dioxodecahydroacridines in high yields. The present methodology offers several advantages, such as a simple procedure with an easy work-up, short reaction times, high yields, and the absence of any volatile and hazardous organic solvents.

A Study on the Recycling Ratio in Major Materials of Expired Railway Vehicles (사용내구연한이 만료된 철도차량의 주요 재질별 재활용률 산정에 관한 연구)

  • Choi, Yong-Sin;Hwang, Dong-Hoon;Lee, Kun-Mo;Lee, Cheol-Kyu
    • Proceedings of the KSR Conference
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    • pp.2278-2282
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    • 2010
  • The regulation involved with railway vehicles is defined by law to protect customer and fundamental safety. The persisting period of domestic railway vehicles in general are 25~30years. Expired railway vehicles are disused in various way. The railway vehicles are consists of recyclable various materials, but there is no standardization or calculating method related with railway vehicles to make disuse scenario. In this study, performed to get a recycling ratio about major materials of domestic subway railway vehicles using ISO 22628 which is Road vehicles-Recyclability and recoverrability method. This research provide foundation for further researches, standardization of EoL stage and recycling railway vehicle.

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Silica Supported Tungstosilicic Acid as an Efficient and Reusable Catalyst for the One-Pot Synthesis of β-Acetamido Ketones via a Four-Component Condensation Reaction

  • Nasr-Esfahani, Masoud;Montazerozohori, Morteza;Gholampour, Tahere
    • Bulletin of the Korean Chemical Society
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    • v.31 no.12
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    • pp.3653-3657
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    • 2010
  • Silica supported tungstosilicic acid has been used as an effective catalyst for a modified Dakin-West one-pot, four-component condensation of an aryl aldehyde, an aryl ketone, acetyl chloride and acetonitrile for the synthesis of $\beta$-acetamido ketones. This catalytic system can act as an active, inexpensive, recoverable and recyclable catalyst. Some advantages of this system are short reaction times, good to excellent yields, easy work up and the ability to be carried out at the large scale reactions.

Pressure Distribution Simulation on Geometrical Manifolds Structure for Fabrication of a Planar-type Fuel-Cell Stack (평판형 연료전지 스택의 제조를 위한 매니폴드 형상별 압력분포 시뮬레이션)

  • Park, Se-Joon;Choi, Young-Sung;Lee, Kyung-Sup
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.4
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    • pp.609-614
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    • 2009
  • A fuel-cell power system among various alternative power sources has many advantages such as comparatively independable circumstances, high-efficient, and heat-recyclable, thus it is now able to be up to hundreds MWh-scaled through improving feasibility and longevity of it. During the last few decades, numerous research results has been investigated to expand interest in fuel-cell technology. This study presents pressure distribution on the geometrical manifold structures, which are U-type and Z-type, of a planar-type fuel-cell stack by simulated with computational fluid dynamics(CFD). Then, electrical performance of a 200W fuel-cell stack, which is U-type, was diagnosed after pre-conditioning operation. The stack has electrical characteristics ; 22V, 10A, 220W, and current density $200mA/cm^2$.

Highly Efficient and Facile Green Approach for One-Pot Fischer Indole Synthesis (One-Pot Fischer Indole 화합물의 효율적인 합성)

  • Chaskar, Atul;Deokar, Hrushikesh;Padalkar, Vikas;Phatangare, Kiran;Patil, S.K.
    • Journal of the Korean Chemical Society
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    • v.54 no.4
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    • pp.411-413
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    • 2010
  • A simple, efficient and an environmental friendly method have been developed for the synthesis of substituted indole from aryl hydrazines and aldehydes/ketones with HPA-phosphomolybdic acid as a heterogeneous catalyst. The catalyst is nontoxic and recyclable.