• Title/Summary/Keyword: separation type

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A Study on the Development of Active Circulating Type Oil Recovery Vessel

  • Lee, Kji-Joo;Shugan, Igor V.;An, Jung-Sun
    • Journal of Ocean Engineering and Technology
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    • v.21 no.6
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    • pp.1-6
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    • 2007
  • A study on the new active circulation type oil-water separation system including buoyancy type guidance system was carried out in this paper. Newly developed oil-water separation system is composed of several oil separation steps. In the beginning of these steps, buoy type separation system would be used. Buoy type oil guiding system was developed based on the difference of density of water and oil.

A Study on the Buoy type Oil Guiding System for the Active Circulation type Oil Recovery Vessel (자연순환식 유회수선박에서의 부유식 기름유도장치에 관한 연구)

  • 이귀주;김경화
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.10a
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    • pp.185-189
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    • 2001
  • A study on the new active circulation type oil-water separation system including buoyancy type guidance system was carried out in this paper. Oil-water separation system is composed of several oil separation steps. Buoy type oil guiding system was developed based on the difference of buoyance of water and oil. The design speed of this vessel is 25 knots.

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Pervaporation Separation of Phenol-Water Mixtures by Using Silicone Membranes (실리콘 막을 이용한 페놀-물 혼합물의 투과 증발 분리)

  • Rhim, Ji-Won;Sohn, Min-Young;Lee, Kew-Ho
    • Applied Chemistry for Engineering
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    • v.5 no.5
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    • pp.772-778
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    • 1994
  • The pervaporation separation experiments of phenol-water mixtures were carried out by using Type 1 (PDMS : crosslinking agent= 1 : 0.25) and Type 2 (PDMS : crosslinking agent= 1 : 0.35) silicone rubber membranes at 30, 40 and $50^{\circ}C$. The phenol concentrations in the feed to be separated were 500 ppm to 5 wt%. Type 2 membranes were more efficient than Type 1 membranes for the separation of phenol-water mixtures. The phenol concentration of 70wt% was obtained for 5wt% of phenol concentration in the feed at $30^{\circ}C$ and 11wt% phenol concentration observed for 500ppm of phenol concentration in the feed at $30^{\circ}C$ by using Type 2 membranes.

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Development of volume reduction method of cesium contaminated soil with magnetic separation

  • Yukumatsu, Kazuki;Nomura, Naoki;Mishima, Fumihito;Akiyama, Yoko;Nishijima, Shigehiro
    • Progress in Superconductivity and Cryogenics
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    • v.18 no.1
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    • pp.10-13
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    • 2016
  • In this study, we developed a new volume reduction technique for cesium contaminated soil by magnetic separation. Cs in soil is mainly adsorbed on clay which is the smallest particle constituent in the soil, especially on paramagnetic 2:1 type clay minerals which strongly adsorb and fix Cs. Thus selective separation of 2:1 type clay with a superconducting magnet could enable to reduce the volume of Cs contaminated soil. The 2:1 type clay particles exist in various particle sizes in the soil, which leads that magnetic force and Cs adsorption quantity depend on their particle size. Accordingly, we examined magnetic separation conditions for efficient separation of 2:1 type clay considering their particle size distribution. First, the separation rate of 2:1 type clay for each particle size was calculated by particle trajectory simulation, because magnetic separation rate largely depends on the objective size. According to the calculation, 73 and 89 % of 2:1 type clay could be separated at 2 and 7 T, respectively. Moreover we calculated dose reduction rate on the basis of the result of particle trajectory simulation. It was indicated that 17 and 51 % of dose reduction would be possible at 2 and 7 T, respectively. The difference of dose reduction rate at 2 T and 7 T was found to be separated a fine particle. It was shown that magnetic separation considering particle size distribution would contribute to the volume reduction of contaminated soil.

Separation Performance of Disc Plate and Frame Type Reverse Osmosis System (원판틀형 역삼투 시스템의 투과성능)

  • 노상호;이종일;김영채;배성렬;정건용
    • Membrane Journal
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    • v.10 no.3
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    • pp.155-162
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    • 2000
  • The reverse osmosis membrane housing(HY) was developed for excellent distribution of a feed solution, and the separation performance was compared with the commercialized Rochem(RC) system. The permeation flux of HY system was a little lower than that of RC system. On the other hand, the NaCl rejection ra4io was generally higher. Also, the permeation flux and rejection ratio for type A, B and C modules(disc plate and frame type) were measured using NaCl, sucrose and butanol solutions. The separation performance of type C module for NaCL and sucrose solutions was the most effective, and then those of type A and B were followed, respectively. However, the separation performance for butanol solution was type B, C and A order. The flux improvement ratio of type B to A increased as butanol concentration decreased or operating pressure increased up to 28 bar.

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Non-contact type AFM using frequency separation scheme (주파수응답 분리방법을 이용한 비접촉식 AFM)

  • 이성규;염우섭;박기환;송기봉;김준호;김은경;박강호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.375-378
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    • 2002
  • In this paper, the frequency response separation scheme is proposed for high scanning speed and simple structure of non-contact type of AFM. A self-sensing cantilever is attached on the actuator for detect the atomic force between tip and the media surface. VCM or PZT are used for actuator. This paper presents the method to simplify the actuator structure and the performance of each actuator for non-contact type AFM. Based on the frequency response separation scheme, the only one actuator plays roles 1311owing low frequency surface and modulating self-sensing cantilever tip in contrast with convention non-contact type AFM. 10 ${\mu}{\textrm}{m}$ standard grid sample imaged to verify proposed scheme. This result shows the possibility simplifying the actuator structure and reducing cost of non-contact type AFM.

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Analysis of Financial Structure of Hospitals Before and After The Separation of Prescription and Drug Dispensing Policy (의약분업 전.후 병원재무구조 평가)

  • Park, Ho-Soon;Yoo, Kyu-Soo;Lee, Chang-Eun
    • Korea Journal of Hospital Management
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    • v.8 no.3
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    • pp.118-142
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    • 2003
  • This study is aimed at evaluating the financial structure of hospitals before and after the separation of prescription and drug dispensing policy started to be implemented in July 2000 and at making a suitable hospital managerial strategy through the verification of the factors which have effect on their profitability. This study investigated the hospitals which have passed the accredition review to be designated as a accredited training hospital each year for three years from 1999 to 2001. Those hospitals were selected from members of the Korea Hospital Association. 106 hospitals were targeted for analysis except for the hospitals whose financial statements and managerial performance were not reported faithfully. The financial indicators used in this study were stability indicators(liability to total assets, ratio of debt to fund balance, fixed ratio), liquidity indicators(current ratio, quick ratio), activity indicators(total assets turnover, fixed assets turnover), profitability indicators(net profit to total assets, net profit to net worth, operating margin), and operating expenses to patient revenues indicators(drug and supplies costs/payroll/overhead expenses). The result of this study are as follows: First, the analysis of the increase of loss-making hospitals before and after. The separation of prescription and drug dispensing policy shows that the number of loss-making hospitals increase after the separation(22.6% before the separation; 31.1% after the separation). However, there was no significant statistical difference. Second, the analysis of operating expenses to patient revenues indicators showed that the ratio of drug and supplies cost became lower in all hospitals but the ratio of payroll/overhead expenses became higher. Additionally, the factor which have the greatest effect on profitability was operating expenses to patient revenues indicators (drug and supplies costs/payroll/overhead expenses). Third, the analysis of managerial performance by four types of loss-loss, loss-profit, profit-loss and profit-profit compared the results before the separation with those after the separation revealed as follows : Reliance on liability to total assets became higher in the profit-loss type($56.2%{\rightarrow}66.4%$), lower in the loss-profit type($82.7%{\rightarrow}74.5%$). Total assets turnover became higher in the profit-profit type($1.3{\rightarrow}1.5$), but lower in the loss-profit type($0.8{\rightarrow}0.7$). Operating margin decreased to minus 5.9% from 4.3% in the profit-loss type, but increased to 7.2% from minus 7.8% in the loss-profit type. Forth, operating expenses to revenues indicators showed that the increase of payroll was the biggest in the profit-loss type($39.2%{\rightarrow}49.9%$) and that overhead cost decreased in the loss-profit type but that rather increased in other types.

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Debonding and Postbuckling Failure Characteristics of Composite Stiffened Panels (복합재 보강패널의 분리파손 및 좌굴 후 강도 특성)

  • Kim, Kwang-Soo;Yoo, Jae-Seok;An, Jae-Mo;Jang, Young-Soon;Yi, Yeong-Moo
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2005.04a
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    • pp.59-63
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    • 2005
  • Compression tests were performed for six types of hat stiffened composite panels with different bonding methods and stiffener section shapes. Six panels showed similar behaviors in buckling and post-buckling region before a skin-stiffener separation failure occurred. The skin-stiffener separation failures occurred in the panels with closed type stiffeners regardless of bonding methods, but not in the panels with open type stiffeners. The separation failures not only reduced the postbuckling strength but also changed buckling mode and postbuckling stiffness. All the separation failures were initiated at the stiffener flange edges closest to skin buckling crests. The co-cured or secondary bonded panels with open type stiffeners had the largest structural performance. Because the post-buckling strength and performance of the composite stiffened panels are reduced by the separation failure, it is important to find bonding methods, stiffener types and manufacturing parameters for preventing of the separation failure.

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Fabrication of Movable Separator for Site to Discharge Medium and Large-Scale Mixed Construction Waste from Agricultural Areas and Its Efficiency Evaluation (농촌지역 혼합건설폐기물의 중·소규모 배출현장용 이동식 분리선별기 제작 및 선별 효율 성능평가)

  • Kim, Byung-Yun;Park, Ji-Sun
    • Journal of the Korean Institute of Rural Architecture
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    • v.23 no.1
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    • pp.1-8
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    • 2021
  • In this study, a real-sized experimental equipment (pilot plant) was built at the site based on the preliminary research data to develop a movable separator for the mixed construction waste that can be implemented in agricultural areas to review its feasibility through the evaluation of its separation efficiency by waste types. The final construction of the movable separator and experimental results of the separation efficiency are summarized as follows. 1) The separation performance according to the blade type was the best for the combustible wastes either with 26 numbers of L-type blades and 32 numbers of pin type blades. As far as combination of blade types, when the L-type and pin-type were combined, the best separation efficiency was achieved. 2) The separation efficiency for waste wood by the conveyor type and angle of inclination (slope) of the trommel was the best when the conveyor had ribs of seagull shape with the angle of inclination 45°. 3) The separation efficiencies by process showed that 65.9% was separated as inorganic demolition wastes, 18.2% as waste woods, and 16.0% as combustible wastes at conveyor speed of 2-3 rpm, and the error rate was the least from the waste types generated in the dismantle site.