• 제목/요약/키워드: High $CO_2$

검색결과 9,309건 처리시간 0.043초

초고층 공동주택 세대내 개보수 주기에 따른 이산화탄소 배출량 연구 (A Study on Quantity of CO2 Emission about Remodeling Cycle at High-rise Apartment housing)

  • 김다유;강승이;제해성
    • KIEAE Journal
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    • 제10권3호
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    • pp.75-80
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    • 2010
  • The goal of this study is to figure out the remodeling cycle at high-rise apartment housing and to analysis on quantity of $CO_2$ emission about remodeling cycle. The process of research is as follow; 1) Estimate the remodeling cycle through survey targeting residents at high-rise apartment building. 2) Simulate conditions on the high-rise apartment housing. 3) Calculate quantity of energy consumption and $CO_2$ emission 4) Derive elements that are on high level of environmental load evaluation. The main results of this study is as follow; 1) The cycle of finishing such as wallpaper is shorter than the cycle of building equipment such as elements in a toilet. 2) According to result of calculating $CO_2$ emission, fabric wallpaper and mortar are main factors that impact on the environment. The results is important to show reference points on quantitative measuring evaluation for the environmental-friendly extent.

Influence of Nitrogen moieties on CO2 capture of Carbon Aerogel

  • Jeon, Da-Hee;Min, Byung-Gak;Oh, Jong Gab;Nah, Changwoon;Park, Soo-Jin
    • Carbon letters
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    • 제16권1호
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    • pp.57-61
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    • 2015
  • Carbon aerogel is a porous carbon material possessing high porosity and high specific surface area. Nitrogen doping reduced the specific surface area and micropores, but it furnished basic sites to improve the $CO_2$ selectivity. In this work, N-doped carbon aerogels were prepared with different ratios of resorcinol/melamine by using the sol-gel method. The morphological properties were characterized by scanning electron microscopy (SEM). Nitrogen content was studied by X-ray photoelectron spectroscopy (XPS) and the specific surface area and micropore volume were analyzed by $N_2$ adsorption-desorption isotherms at 77 K. The $CO_2$ adsorption capacity was investigated by $CO_2$ adsorption-desorption isotherms at 298 K and 1 bar. Melamine containing N-doped CAs showed a high nitrogen content (5.54 wt.%). The prepared N-doped CAs exhibited a high $CO_2$ capture capacity of 118.77 mg/g (at resorcinol/melamine = 1:0.3). Therefore, we confirmed that the $CO_2$ adsorption capacity was strongly affected by the nitrogen moieties.

용제와 혼합한 금속분말의 $CO_2$ 레이저 클래딩 특성 (Characteristics of $CO_2$ Laser Cladding with High Viscosity Mixed Powder)

  • 김재도;전병철;이영곤;오동수
    • Journal of Welding and Joining
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    • 제19권5호
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    • pp.481-485
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    • 2001
  • Laser cladding processing allows rapid transfer of heat to the material being processed with minimum conduction into base metal. The effect of $CO_2$ laser cladding with high viscosity mixed powders was investigated. High viscosity mixed powder consists of bronze powder and flux that is used at a high temperature condition. The mixed powder has a high viscosity that it can be easily pasted over a curved or slope substrate. The device for mixed powder was designed and manufactured. It consists of the high viscosity mixed powder feeding system, the preheating system and the shielding gas system which prevents the clad layer from being oxidized. The results of experiment indicated that the feed rate of high viscosity mixed powder was important for later cladding with mixed powder feeding. The high viscosity mixed powder and substrate must be preheated to prevent porosity from breaking at the clad layer. The experimental result shows that the high viscosity mixed can be applied for laser cladding process.

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High Performance 2.2 inch Full-Color AMOLED Display for Mobile Phone

  • Kim, H.K.;Suh, M.S.;Lee, K.S.;Eum, G.M.;Chung, J.T.;Oh, C.Y.;Kim, B.H.;Chung, H.K.
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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    • pp.325-328
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    • 2002
  • We developed a high performance 2.2" active matrix OLED display for IMT-2000 mobile phone. Scan and Data driver circuits were integrated on the glass substrate, using low temperature poly-Si(LTPS) TFT CMOS technology. High efficiency EL materials were employed to the panel for low power consumption. Peak luminescence of the panel was higher than 250cd/$m^2$ with power consumption of 200mW.

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$CO_2$ 자동차 에어컨 시스템의 최적 고압 설정 알고리즘 개발에 관한 연구 (Development of Optimum High Pressure Algorithm for a Transcritical $CO_2$ Mobile Air-Conditioning System)

  • 이종붕;이준경
    • 한국자동차공학회논문집
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    • 제16권3호
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    • pp.159-165
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    • 2008
  • This paper deals with the optimum high pressure control algorithm for a transcritical $CO_2$ mobile air-conditioning system with belt-driven compressor to achieve the maximum COP. The experiments were performed to find out the maximum COP conditions with various operating conditions. The experimental results showed that the COP was increased and then decreased with increase of the refrigerant high pressure for the system. Therefore the value of high pressure which has maximum COP could be selected. Furthermore, the strong (linear) relation between the optimum high pressure and the gas cooler outlet temperature was revealed, which suggests the use of a simple controller with only one parameter for the transcritical $CO_2$ cycle.

고압 이산화탄소에 의한 Leuconostoc sp.의 살균 효과 (Effect of High Pressure Carbon Dioxide on Inactivation of Leuconostoc sp.)

  • 홍석인;박완수;변유량
    • 한국식품과학회지
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    • 제29권6호
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    • pp.1202-1207
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    • 1997
  • 가열 살균을 대체하여 식품의 신선도를 유지하면서 효과적으로 미생물을 사멸시킬 수 있는 새로운 비가열 살균기술로서 고압 $CO_2$, 처리를 고찰하고자 하였다. 이를 위해 김치에서 분리한 Leuconostoc sp.를 대상 미생물로 가압 조절인자를 달리하여 이 균주에 미치는 고압 $CO_2$의 살균 효과를 검토하였다. 사용 압력과 온도, 처리시간이 증가할수록, 이에 반해 작업용량은 감소할수록 균체의 사멸율이 증가하였으며, $30^{\circ}C$, $60\;kg/cm^2$$CO_2$가압 조건에서 젖산균 배양액을 $10^{-3}$만큼 감균하는데 약 150분이 소요되었다. 실험 결과로부터 고압 $CO_2$에 의한 미생물 살균은 기본적으로 $CO_2$의 세포내 침투에 의해 좌우되며, 따라서 세포 내부로의 $CO_2$ 전달 과정이 전체적인 살균 효율을 결정짓는 가장 중요한 단계임을 확인할 수 있었다.

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Growth and Photosynthetic Responses of One C3 and Two C4 Chenopodiaceae Plants to Three CO2 Concentration Conditions

  • Ishikawa, Shin-Ichi
    • Journal of Ecology and Environment
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    • 제31권4호
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    • pp.261-267
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    • 2008
  • Growth and photosynthetic responses of one $C_3$ and two $C_4$ plants in the family Chenopodiaceae in three $CO_2$ concentration $([CO_2])$ conditions-low (about $243{\mu}mol\;mol^{-1}$, LC), present (about 378, PC), and high (about 465, HC)-were investigated in open top chambers. The relative growth rate (RGR) and net assimilation rate in the $C_3$ plant, Chenopodium album, increased with increasing $[CO_2]$, though the RGR was not enhanced significantly in the HC condition. The leaf area ratio and leaf weight ratio of the $C_3$ plant drastically decreased with increasing $[CO_2]$, suggesting that the $C_3$ plant invests more biomass to leaves in lower $[CO_2]$ conditions. The two $C_4$ plants, Atriplex glauca and A. lentiformis, showed relatively small changes in those growth parameters. These photosynthetic-pathway-dependent responses suggest that growth patterns of $C_3$ and $C_4$ plants have been altered by past increases in atmospheric $[CO_2]$ but that there will be relatively little further alteration in the future high-$CO_2$ world.

Facile Synthesis of Hollow CuO/MWCNT Composites by Infiltration-Reduction-Oxidation Method as High Performance Lithium-ion Battery Anodes

  • Zheng, Gang;Li, Zhiang;Lu, Jinhua;Zhang, Jinhua;Chen, Long;Yang, Maoping
    • Journal of Electrochemical Science and Technology
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    • 제11권4호
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    • pp.399-405
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    • 2020
  • Hollow copper oxide/multi-walled carbon nanotubes (CuO/MWCNT) composites were fabricated via an optimized infiltration-reduction-oxidation method, which is more facile and easy to control. The crystalline structure and morphology were characterized by X-ray diffraction (XRD), and transmission electron microscopy (TEM). The as-prepared CuO/MWCNT composites deliver an initial capacity of 612.3 mAh·g-1 and with 80% capacity retention (488.2 mAh·g-1) after 100 cycles at a current rate of 0.2 A·g-1. The enhanced electrochemical performance is ascribed to the better electrical conductivity of MWCNT, the hollow structure of CuO particles, and the flexible structure of the CuO/MWCNT composites.

고농도 $CO_2$와 Ascorbic acid 처리가 신선절단 사과의 갈변에 미치는 영향 (Effects of Combined Treatment with High $CO_2$ Concentration and Ascorbic acid on Browning of Fresh-cut 'Fuji' Apples)

  • 김선영;조정석;정문철;문광덕
    • 한국식품저장유통학회지
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    • 제18권4호
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    • pp.475-480
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    • 2011
  • 신선절단 '후지' 사과의 고품질 유지를 위한 방법을 개발하기 위하여, 고농도 $CO_2$와 ascorbic acid 처리가 저장 중 품질변화에 미치는 영향을 조사하였다. 아무것도 처리하지 않은 사과(대조구)와 고농도 $CO_2$를 처리한 사과를 8조각으로 절단하여($CO_2$ 단일처리구) 1% ascorbic acid에 1분 동안 침지($CO_2$와 ascorbic acid 병용처리구), $CO_2$ 처리 없이 ascorbic acid에 침지(ascorbic acid 단일처리구)를 0.03 mm polypropylene 필름에 밀봉 포장하여 $10^{\circ}C$에 저장하면서 품질 특성의 변화를 측정하였다. $CO_2$ 단일처리구와 $CO_2$와 ascorbic acid 병용 처리구에서 갈변도의 변화율이 가장 낮았다. $CO_2$를 처리하지 않은 구는 저장기간이 길어짐에 따라 조직이 무르거나 갈색반점이 발생하는데 반해 $CO_2$ 처리구에서는 관찰되지 않았다. 가용성 고형분 함량이나 pH, 포장 내 기제 조성 등에서는 처리구별 유의적인 차이가 없었으며 총균수는 $CO_2$ 단일 처리구가 대조구에 비해 총균수가 적은 것으로 나타났으나 저장 7일차부터 모든 처리구에서 급격히 증가하였다. 따라서 고농도 $CO_2$ 처리는 단일처리거나 ascorbic acid와의 병용처리는 신선절단 사과의 갈변과 연화 저해에 효과가 있음이 확인되었다.

안면도 지역 온실기체 기원에 따른 CO/CO2 비율 변동성 분석 연구 (Analysis of CO/CO2 Ratio Variability According to the Origin of Greenhouse Gas at Anmyeon-do)

  • 김재민;이해영;김수민;정주용;김연희;이그림;최경배;이윤곤
    • 대기
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    • 제31권5호
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    • pp.625-635
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    • 2021
  • South Korea established the 2050 Carbon Neutral Plan in response to the climate crisis, and to achieve this policy, it is very important to monitor domestic carbon emissions and atmospheric carbon concentration. Both CO2 and CO are emitted from fossil fuel combustion processes, but the relative ratios depend on the combustion efficiency and the strength of local emission regulations. In this study, the relationship between CO2 and CO was analyzed using ground observation data for the period of 2018~2020 at Anmyeon-do site and the CO/CO2 ratio according to regional origin during high CO2 cases was investigated based on the footprint simulated from Stochastic Time-Inverted Lagrangian Transport (STILT) model. CO2 and CO showed a positive correlation with correlation coefficient of 0.66 (p < 0.01), and averaged footprints during high CO2 cases confirmed that air particles mainly originated from eastern and north-eastern China, and inland of Korean Peninsula. In addition, it was revealed that among the cases of high CO2 concentration, when the CO/CO2 ratio is high, the industrial area of eastern China is greatly affected, and when the ratio is low, the contribution of the domestic region is relatively high. The ratio of CO2 and CO in this study is significant in that it can be used as a useful factor in determining the possibility of domestic and foreign origins of climate pollutants.