• Title/Summary/Keyword: CARBON ABSORPTION

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Estimation of Carbon Absorption Distribution by Land Use Changes using RS/GIS Method in Green Land (RS/GIS를 이용한 토지이용변화에 의한 녹지의 이산화탄소 (CO2) 흡착량 분포 추정)

  • Na, Sang-Il;Park, Jong-Hwa;Park, Jin-Ki
    • Journal of The Korean Society of Agricultural Engineers
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    • v.52 no.3
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    • pp.39-45
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    • 2010
  • Quantification of carbon absorption and understanding the human induced land use changes (LUC) forms one of the major study with respect to global climatic changes. An attempt study has been made to quantify the carbon absorption by LUC through remote sensing technology. The Landsat imagery four time periods was classified with the hybrid classification method in order to quantify carbon absorption by LUC. Thereafter, for estimating the amount of carbon absorption, the stand biomass of forest was estimated with the total weight, which was the sum of individual tree weight. Individual tree volumes could be estimated with the crown width extracted from digital forest cover type map. In particular, the carbon conversion index and the ratio of the $CO_2$ molecular weight to the C atomic weight, reported in the IPCC guideline, was used to convert the stand biomass into the amount of carbon absorption. Total carbon absorption has been modeled by taking areal estimates of LUC of four time periods and carbon factors for land use type and standing biomass. Results of this study, through LUC suggests that over a period of construction, 7.10 % of forest and 9.43 % of barren were converted into urban. In the conversion process, there has been a loss of 6.66 t/ha/y (7.94 %) of carbon absorption from the study area.

A Comparative Study of Carbon Absorption Measurement Using Hyperspectral Image and High Density LiDAR Data in Geojedo

  • Choi, Byoung Gil;Na, Young Woo;Shin, Young Seob
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.35 no.4
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    • pp.231-240
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    • 2017
  • This paper aims to study a method to estimate precise carbon absorption by quantification of forest information that uses accurate LiDAR data, hyperspectral image. To estimate precise carbon absorption value by using spatial data, a problem was found out of carbon absorption value estimation method with statistical method, which is already existed method, and then offered optimized carbon absorption estimation method with spatial information by analyzing with methods of compare digital aerial photogrammetry and LiDAR data. It turned out possible Precise classification and quantification in case of using LiDAR and hyperspectral image. Various classification of tree species was possible with use of LiDAR and hyperspectral image. Classification of hyperspectral image was matched in general with field survey and Mahalanobis distance classification method. Precise forest resources could be extracted using high density LiDAR data. Compared with existing method, 19.7% in forest area, 19.2% in total carbon absorption, 0.9% in absorption per unit area of difference created, and improvement was found out to be estimated precisely in international code.

Study on Improving Environmental Impact Assessment of Carbon Sink in the Greenhouse Gas Evaluation Criteria for Railway Construction Projects for Carbon Neutrality (탄소 중립을 위한 철도 건설 사업 온실가스 평가항목의 탄소흡수원 분야 환경영향평가 개선 방안 연구)

  • Hwang, Jin-hoo;Namuun, Tuvshinjargal;Won, Joo-hee;Kim, Min-jeong;Park, Da-hye;Jeon, Seong-woo
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.26 no.3
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    • pp.43-55
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    • 2023
  • The railway project is an essential green transportation tool that is considered suitable for the domestic and foreign policy direction of carbon neutrality, but there are some limitations, such as damaging important carbon absorption sources during construction. This study analyzed the environmental impact assessment related to carbon absorption sources of greenhouse gas evaluation items conducted during the railway project, and limitations and implications were derived. The analysis of environmental impact assessment guidelines related to railway projects and carbon absorption sources dealt with prediction and reduction methods related to carbon absorption sources, but guidelines, including environmentally friendly railway construction guidelines, lacked descriptions. Since the greenhouse gas environmental impact assessment, 83 railway project environmental impact assessments have been reviewed, but in some cases, carbon absorption-related predictions have not been implemented, or carbon absorption-related reduction measures have been insufficient. In addition, there were cases where there was a limit to calculating emissions and reduction or where the reduction value was insignificant compared to emissions. In order to supplement the environmental impact assessment in the field of carbon absorption sources related to railway construction projects, alternatives such as quantitative emission and low reduction calculation, review of the no net loss system using the total environmental resource system, and linkage with climate change impact assessment are needed.

Estimation of the Light Absorption Contribution for Asian Dust and Polluted Particles at Gosan, Jeju during the Asian Dust Episode in the Spring 2011 (2011년 봄 황사시기 제주도 고산에서의 황사와 오염입자의 광흡수 기여도 산정)

  • Lee, Si-Hye;Kim, Sang-Woo;Yoon, Soon-Chang
    • Journal of Korean Society for Atmospheric Environment
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    • v.28 no.4
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    • pp.411-422
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    • 2012
  • Ground-based in-situ measurements of aerosol optical properties at Gosan climate observatory have been analyzed to investigate the optical contribution of Asian dust and polluted particles on light absorption in springtime 2011. During the Asian dust episode, the contribution of Asian dust particle to aerosol absorption coefficient estimated about 45% at 370 nm and about 23% at 520 nm. Especially, black carbon in dust plume contributes about 48% to aerosol light absorption at 520 nm since the airmass are transported from the Gobi and inner Mongolia deserts, and this airmass comes across the northeastern coast of China, near the Shandong Peninsula. In pollution case, the contributions of dust particle and black carbon to aerosol absorption coefficient estimated about 41% and 11% at 370 nm, respectively. However, pollution case shows the highest light absorption of 48% for brown carbon at 370 nm, which indicates the significantly high mass concentration of organic carbon ($6.3{\pm}2.2{\mu}g\;m^{-3}$) in pollution plume can contribute to the increase of light absorption at near-UV spectral region.

PREPARATION OF CARBON DIOXIDE ABSORPTION MAP USING KOMPSAT-2 IMAGERY

  • Kim, So-Ra;Lee, Woo-Kyun
    • Proceedings of the KSRS Conference
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    • 2008.10a
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    • pp.200-203
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    • 2008
  • The objective of this study is to produce the $CO_2$ (carbon dioxide) absorption map using KOMPSAT-2 imagery. For estimating the amount of $CO_2$ absorption, the stand biomass of forest was estimated with the total weight, which was the sum of individual tree weight. Individual tree volumes could be estimated by the crown width extracted from KOMPSAT-2 imagery. In particular, the carbon conversion index and the ratio of the $CO_2$ molecular weight to the C atomic weight, reported in the IPCC (Intergovernmental Panel on Climate Change) guideline, was used to convert the stand biomass into the amount of $CO_2$ absorption. Thereafter, the KOMPSAT-2 imagery was classified with the SBC (segment based classification) method in order to quantify $CO_2$ absorption by tree species. As a result, the map of $CO_2$ absorption was produced and the amount of $CO_2$ absorption was estimated by tree species.

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The Effects of Pretreatment with Carbon Tetrachloride on the Absorption and Excretion of Sulfisoxazole (사염화탄소(四鹽化炭素) 간장장해(肝臟障害) 동물(動物)에서의 Sulfisoxazole의 흡수(吸收)와 배설(排泄)에 관(關)한 연구(硏究))

  • Choi, Jun-Shik
    • Journal of Pharmaceutical Investigation
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    • v.6 no.2
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    • pp.88-94
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    • 1976
  • This paper attempted to investigate the effect of pretreatment with carbon tetrachloride on absorption, excretion, protein binding, and biological half-life of sulfisoxazol from rats and rabbits. Absorption of sulfisoxazol was found to decrease in severe damage rats, compared with that of normal rats, but in mild rats, absorption of sulfisoxazol was similar to that of nomal rats. Absorption of sulfisoxazol was decreased significantly in severe damage rabbit pretreated with carbon tetrachloride but in mild damage rabbit, absorption of sulfisoxazol was not influenced significantly. Pretreatment with carbon tetrachloride gave the effect on clearance of sulfisoxazol in part but protein binding percent of sulfisoxazol was not influenced by concentration of carbon tetrachloride.

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Physicochemical Characteristics and Carbon Dioxide Absorption Capacities of Alkali-activated Blast-furnace Slag Paste (알칼리 활성화된 고로슬래그 페이스트의 물리화학적 특성 및 이산화탄소 흡수능 평가)

  • Ahn, Hae Young;Park, Cheol Woo;Park, Hee Mun;Song, Ji Hyeon
    • International Journal of Highway Engineering
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    • v.17 no.2
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    • pp.99-105
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    • 2015
  • PURPOSES: In this study, alkali-activated blast-furnace slag (AABFS) was investigated to determine its capacity to absorb carbon dioxide and to demonstrate the feasibility of its use as an alternative to ordinary Portland cement (OPC). In addition, this study was performed to evaluate the influence of the alkali-activator concentration on the absorption capacity and physicochemical characteristics. METHODS: To determine the characteristics of the AABFS as a function of the activator concentration, blast-furnace slag was activated by using calcium hydroxide at mass ratios ranging from 6 to 24%. The AABFS pastes were used to evaluate the carbon dioxide absorption capacity and rate, while the OPC paste was tested under the same conditions for comparison. The changes in the surface morphology and chemical composition before and after the carbon dioxide absorption were analyzed by using SEM and XRF. RESULTS: At an activator concentration of 24%, the AABFS absorbed approximately 42g of carbon dioxide per mass of paste. Meanwhile, the amount of carbon dioxide absorbed onto the OPC was minimal at the same activator concentration, indicating that the AABFS actively absorbed carbon dioxide as a result of the carbonation reaction on its surface. However, the carbon dioxide absorption capacity and rate decreased as the activator concentration increased, because a high concentration of the activator promoted a hydration reaction and formed a dense internal structure, which was confirmed by SEM analysis. The results of the XRF analyses showed that the CaO ratio increased after the carbon dioxide absorption. CONCLUSIONS : The experimental results confirmed that the AABFS was capable of absorbing large amounts of carbon dioxide, suggesting that it can be used as a dry absorbent for carbon capture and sequestration and as a feasible alternative to OPC. In the formation of AABFS, the activator concentration affected the hydration reaction and changed the surface and internal structure, resulting in changes to the carbon dioxide absorption capacity and rate. Accordingly, the activator ratio should be carefully selected to enhance not only the carbon capture capacity but also the physicochemical characteristics of the geopolymer.

Microwave Absorption Study of Carbon Nano Materials Synthesized from Natural Oils

  • Kshirsagar, Dattatray E.;Puri, Vijaya;Sharon, Maheshwar;Sharon, Madhuri
    • Carbon letters
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    • v.7 no.4
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    • pp.245-248
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    • 2006
  • Thin films of carbon-nano materials (CNMs) of different morphology have been successfully deposited on ceramic substrate by CVD at temperatures $800^{\circ}C$, $850^{\circ}C$ and $900^{\circ}C$ using plant based oils in the presence of transition metal catalysts (Ni, Co and Ni/Co alloys). Based on the return and insertion loss, microwave absorption properties of thin film of nanocarbon material are measured using passive micro-Strip line components. The result indicates that amongst CNMs synthesized from oil of natural precursors (mustered oil - Brassica napus, Karanja oil - Pongamia glabra, Cotton oil - Gossipium hirsuta and Neem oil - Azadirachta indica) carbon nano fibers obtained from neem's seed oil showed better microwave absorption (~20dB) in the range of 8.0 GHz to 17.90 GHz.

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Energy Absorption Characteristics of the Al/CFRP/GFRP Hybrid Member under Quasi-static Axial Compressive Load (준정적 축 압축하중을 받는 Al/CFRP/GFRP 혼성부재의 에너지흡수 특성)

  • Kim, Sun-Kyu;Heo, Uk;Im, Kwang-Hee;Jung, Jong-An
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.4
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    • pp.588-592
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    • 2012
  • This study concentrates the effect of hybridisation on the collapse mode and energy absorption for composite cylinders. The static collapse behavior of laminated(Al/CFRP/GFRP) circular-cylindrical composite shell under quasi-static axial compressive load has been investigated experimentally. Eight different hybrids of laminated(Al/CFRP/GFRP) circular-cylindrical composite shell were fabricated by autoclave. Eight types of composites were tested, namely, Al/carbon fiber/epoxy, Al/glass fiber/epoxy, Al/carbon-carbon-glass/epoxy, Al/carbon-glass-carbon/epoxy, Al/carbon-glass-glass/epoxy, Al/glass-glass-carbon/epoxy, Al/glass-carbon-glass/epoxy and Al/glass-carbon-carbon/epoxy. Collpase modes were highly dominated by the effect of hybridisation. The results also showed that the hybrid member with material sequence of Al-glass-carbon-carbon/epoxy exhibited good energy absorption capability.

The Effects of Temperature and Water Absorption on Failure Behaviors of Carbon / Aramid Fiber Composites (온도 및 수분이 탄소/아라미드 섬유 복합재의 파손거동에 미치는 영향)

  • Kwon, Woo Deok;Kwon, Oh Heon;Park, Woo Rim
    • Journal of the Korean Society of Safety
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    • v.37 no.4
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    • pp.11-19
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    • 2022
  • This paper presents the effects of high temperature and water absorption on the mechanical behaviors of carbon-aramid fiber composites, specifically their strength, elastic modulus, and fracture. These composites are used in industrial structures because of their high specific strength and toughness. Carbon fiber composites are vulnerable to the impact force of external objects despite their excellent properties. Aramid fibers have high elongation and impact absorption capabilities. Accordingly, a hybrid composite with the complementary properties and capabilities of carbon and aramid fibers is fabricated. However, the exposure of aramid fiber to water or heat typically deteriorates its mechanical properties. In view of this, tensile and flexural tests were conducted on a twill woven carbon-aramid fiber hybrid composite to investigate the effects of high temperature and water absorption. Moreover, a multiscale analysis of the stress behavior of the composite's microstructure was implemented. The results show that the elastic modulus of composites subjected to high temperature and water absorption treatments decreased by approximately 22% and 34%, respectively, compared with that of the composite under normal conditions. The crack behavior of the composites was well identified under the specimen conditions.