• Title/Summary/Keyword: Eco-engineering

Search Result 2,056, Processing Time 0.043 seconds

Electrochemistry of Hemoglobin in the Chitosan and TiO2 Nanoparticles Composite Film Modified Carbon Ionic Liquid Electrode and Its Electrocatalysis

  • Sun, Wei;Li, Xiaoqing;Liu, Shufeng;Jiao, Kui
    • Bulletin of the Korean Chemical Society
    • /
    • v.30 no.3
    • /
    • pp.582-588
    • /
    • 2009
  • Direct electron transfer of hemoglobin (Hb) in the chitosan (CTS) and $TiO_2$ nanoparticles (nano-$TiO_2$) composite films was achieved by using a room temperature ionic liquid of 1-butyl-3-methylimidazolium hexafluorophosphate ($BMIMPF_6$) modified carbon paste electrode (CILE) as the basal electrode. UV-Vis and FT-IR spectroscopy indicated that Hb in the film retained the native structure. Electrochemical investigation indicated that a pair of well-defined quasi-reversible redox peaks of Hb heme Fe(III)/Fe(II) was obtained with the formal potential located at -0.340 V (νs. SCE) in pH 7.0 phosphate buffer solution (PBS). The electrochemical parameters such as the electron transfer coefficient (α), the electron transfer number (n) and the standard electron transfer rate constant ($k_s$) were got as 0.422, 0.93 and 0.117 $s^{-1}$, respectively. The fabricated CTS/nano-$TiO_2$/Hb/CILE showed good electrocatalytic ability to the reduction of trichloroacetic acid (TCA) and hydrogen peroxide ($H_2O_2$), which exhibited a potential application in fabricating a new kind of third generation biosensor.

An Approximate Cost Estimating Model for Eco-River Facility Construction Project at Planning Stage (자연형 하천공사 개략공사비 산정모델의 개발)

  • Choi, In-Wook;Lee, Si-Wook;Woo, Sung-kwon
    • Korean Journal of Construction Engineering and Management
    • /
    • v.10 no.5
    • /
    • pp.104-112
    • /
    • 2009
  • After the middle of 90's, the eco rivers maintenance enterprise was propelled about city rivers. The environmental function is more emphasized because of revising the rivers law enforced at 2008.4. Also, the field of application is being magnified. It is difficult to apply that the conceptual public work expense estimating model of the rivers which adjusts a focus at open channel rivers excepts the small-scale rivers maintenance public work. The research presents a eco rivers public work conceptual public work expense estimating model frame work. It suits the change of the rivers environmental renewal construction paradigm. It develops the conceptual public work expense estimating plan of the rivers at the planning phase using the collection and analysis of the data. As a result, riffle, spur dyke, stepping stones, fish way and etc are added. Consequently, it brings the hydrophilic function is considered seriously conceptual public work expense estimating model of the eco rivers.

Lessons Learned from Eco-town Cases for Sustainable Development (지속가능한 발전을 위한 국제 에코타운개발 사례분석)

  • Chang, Hoon
    • KSCE Journal of Civil and Environmental Engineering Research
    • /
    • v.33 no.3
    • /
    • pp.1253-1260
    • /
    • 2013
  • Eco-town development projects have often prevailed throughout the World to initiate the new form of sustainable development plans. As a future development type, the eco-town project shares underlying notions with sustainable development, which has been recently revised into a wider definition; (i) energy efficiency, (ii) climate adaptation, and (iii) socio-economic development. There are four types of eco-town projects based on its characteristics and aims depending on project sites, regions, or countries. This paper tried to demonstrate the types of eco-town projects and summarizes its strategy plans from each type. Many eco-town cases can be placed in one of types, however there cannot be strictly discrete classification by its complicated and composite characteristics of them. In conclusion, the analyzed types can be a useful strategy plan for pursuing further eco-town projects in domestic as well as in international regions.

Study of LST Surface Modification effect on friction and wear at lubricating condition

  • Tripathi, Khagendra;Joshi, Bhupendra;Gyawali, Gobinda;Kim, Seung-Ho;Lee, Soo Wohn
    • Proceedings of the Korean Institute of Surface Engineering Conference
    • /
    • 2014.11a
    • /
    • pp.182-183
    • /
    • 2014
  • Hemispherical dimples with diameter, ø=$60{\mu}m$ and depth, d= $30{\mu}m$ were created on the metal and ceramics surfaces using INYA 10 watt Laser of 1064 nm wavelength. This study reports the influence of dimple pitch on friction and wear behavior rather than dimple size, depth and density. LST was performed on the specimens with dimple pitch and density in the range of 80 to-$200{\mu}m$ and 44 to 7 %, respectively. Surface topography was analyzed by using roughness measurement, scanning electron microscopy (SEM), and optical microscopy. Friction and wear characteristics were analyzed on textured surfaces at lubricating environment to observe the effect of surface texturing on reduction of friction and wear. Reduction on coefficient of friction was achieved by more than 70% due to the dual behavior of dimples as wear (debris) traps and lubricant reservoirs. Wear reduced significantly for the textured surface as compared to the polished surface. Moreover, the friction coefficient of the textured specimens reduced with increasing load and speed which may be attributed to the transition of lubrication regime.

  • PDF

An analysis on the drop impact simulation of dual pump cap container made of eco-friendly materials (친환경 소재로 형성된 듀얼 펌프캡 용기의 낙하충격 시뮬레이션 분석)

  • Wi, Eun-Chan;Ko, Min-Sung;Kim, Hyun-Jeong;Lee, Joong-Bae;Kim, Min-Su;Lee, Joo-Hyung;Kong, Jung-Shik;Baek, Seung-Yub
    • Design & Manufacturing
    • /
    • v.15 no.1
    • /
    • pp.57-65
    • /
    • 2021
  • Pump cap is a product that is widely used due to its ease of use and simple operation. These pump caps are applied to heterogeneous functional cosmetics and are being developed as dual pump caps. However, the conventional dual pump cap has a problem in that it is inconvenient to use and leakage occurs. In addition, it is formed of a plurality of materials, and there is a problem that is difficult to recycle. Lately, since the problem of environmental pollution is getting serious, the dual pump cap, which is difficult to recycle, cannot be used. Currently, eco-friendliness has been considered in Korea, and there are no dual pump cap containers with excellent sealing performance. Therefore, in this study, a dual pump cap container made of eco-friendly material was designed. In addition, finite element analysis was performed to verify the design feasibility of the product.

ECOCS(ECOS & ECOMS) (선박 에너지효율 최적화 시스템)

  • Kim, Jae-Yeol
    • Proceedings of the Korean Society of Marine Engineers Conference
    • /
    • 2012.06a
    • /
    • pp.104-104
    • /
    • 2012
  • 이 프로그램의 중요한점은 기존 모든 선박이 가지고 있는 각종 에너지 손실 및 온실가스 배출관련 육상의 ECO-DRIVER에 준하는 해상의 ECO-SAILING 방식의 알고리즘으로 접근하여 IT융합을 기반으로 SW만으로 에너지 효율 최적화와 온실가스 저감을 구현한다고 할수 있다.

  • PDF

Development of Eco-Block for Grass Growth based on Expanded Vermiculite Absorbing Bacteria (박테리아 흡착 팽창질석 기반 친생태 잔디블록의 개발)

  • Yoon, Hyun-Sub;Jung, Seung-Bae;Yang, Keun-Hyeok;Lee, Sang-Seob;Lee, Jae-Yeung
    • Journal of the Korean Recycled Construction Resources Institute
    • /
    • v.4 no.3
    • /
    • pp.316-321
    • /
    • 2016
  • This study developed an eco-block for grass growth using the expanded vermiculites that absorb bacteria selected considering for the high pH and dry environments and plant growth. For the developed eco-block, a fundamental properties including compressive strength gain and water absorption and ecology characteristics were tested. The selected bacteria was Bacillus alcalophilus a nd Rhodoblastus acidophilus and had high concentration of $10^9cell/mL$. The expanded vermiculite that was used for shelter of bacteria was added by 7.5% and 10% replacement of the natural aggregates by volume. The developed eco-block achieved the minimum requirements specified in SPS provision and significantly effective in reducing chemical Chemical Oxygen Demand(COD) concentration and enhancing the growth of fish and plant.