• Title/Summary/Keyword: system separation method

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Separation of Inorganic Anions by Reversed-phase Ion Chromatography (역상 이온 크로마토그래피에서 무기음이온의 분리)

  • Kih Soo Joe;Tae Yoon Eom;Seung Soo Kim;Youn Doo Kim
    • Journal of the Korean Chemical Society
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    • v.32 no.5
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    • pp.452-457
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    • 1988
  • Capacity factors (k') of some inorganic anions including $BF_4^{-1}$ were measured on cetylpyridinium coated column, and with dynamic system using tetrabutylammonium salicylate on PRP-1 reversed-phase column, respectively. After optimum separation condition was obtained this method was applied to the determination of boron in some different type samples.

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Flow Characteristics for Blade of Industiral Axial Blower by PIV Measurement Method (PIV 계측에 의한 산업용 송풍기 익의 유동특성)

  • Kim, J.G.;Yoon, S.B.
    • Solar Energy
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    • v.19 no.3
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    • pp.115-123
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    • 1999
  • An experimental study was carried out to investigate the flow characteristics of a stationary blade for six kinds of measuring angles of attack, $0^{\circ},\;10^{\circ},\;20^{\circ}\;and\;30^{\circ}$ at Reynolds number of $5.8{\times}10^4$. Instant simultaneous velocity vectors around blade were measured by 2-D PIV system where laser-based illumination and two-frame grey-level cross correlation algorithm were adopted. Velocity profiles show uniform approaching flow from the straightening equipment, and experimental results reveal that separation phenomena occur and the separation point moves upstream with increasing angle of attack.

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Study on the Fluidic Thrust Vector Control Using Co-Flow Concept

  • Wu, Kexin;Jin, Yingzi;Kim, Heuy Dong
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.675-678
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    • 2017
  • In the present, various methods have been employed to obtain the lesser thrust loss. Numerical simulations have been carried out for optimizing the thrust vector control system. Thrust vector control based on coflowing shear layer is an effective method to control the primary jet direction in the absence of moving parts. Thrust vector in symmetric nozzles is acquired by secondary flow injections that result to boundary layer separation. The pressure in secondary flow inlet was varied to check the deflection angle of jet flow.

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The Evaluation of Medium Voltage Motor's Current and Voltage Harmonics during Loading

  • Alboyaci, Bora;Yorukeren, Nuran
    • Journal of Electrical Engineering and Technology
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    • v.2 no.1
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    • pp.35-41
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    • 2007
  • This paper presents the results of investigating harmonic levels on medium voltage motors at loading conditions in air separation plant. The essential results of the measurements of the medium voltage motor harmonics are summarized in the values for the total harmonic distortion (THD). Motors loading case is used to assess the current and voltage harmonic distortions. Proper system analysis is important when adding a new motor starting and controlling the equipment. With the result of the paper it is possible to suggest the most appropriate starting and control method. Two medium voltage motors of air separation unit measurement results and simulations are summarized. Both current and voltage harmonic distortions are fitted by using a linear and exponential regression model. The prediction of THD values can be used for this kind of process for future planning by utilities.

Effect of Atmospheric Gas on the Size and Distribution of Cu Nano Powders Synthesized by Pulsed Wire Evaporation Method (전기 폭발법에 의해 제조된 나노 구리 분말의 크기와 분포에 미치는 조업 가스의 영향)

  • ;;;Y. A. Kotov
    • Journal of Powder Materials
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    • v.11 no.3
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    • pp.210-216
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    • 2004
  • The possibility to decrease agglomeration of Cu nano powders and their separation during pulsed wire evaporation (PWE) process was investigated by controlling the working gas system, i.e., the design of the gas path, the type and pressure of the atmospheric gas. As a result, it was possible to choose the optimal design of the gas path providing large specific surface area and high degree of separation of the synthesized Cu nano powders. It was also shown that an Ar+10∼50$N_2$ mixture can be used in production of Cu nano powders, which do not react with nitrogen.

Biopharmaceutical Studies on Zipeprol Dihydrochloride Microcapsules (염산지페프를 마이크로캅셀에 관한 생물약제학적 연구)

  • Yong, Jae-Ick;Kim, Ock-Nam
    • Journal of Pharmaceutical Investigation
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    • v.18 no.4
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    • pp.187-195
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    • 1988
  • Poorly permeable $Eudragit^{\circledR}$ RS 100 polymer was used as a wall material for the microencapsulation of zipeprol dihydrochloride by a phase separation method from chloroform-cyclohexane system with 5% polyisobutylene in cyclohexane, and microcapsules obtained were evaluated in vitro by particle size analysis, scanning electron microscopy, drug release test and in vivo bioavailability test in rats. The mechanism of drug release from microcapsules appeared to fit Higuchi matrix model kinetics. The area under the first moment of plasma concentration-time curve of the microcapsules obtained was considerably increased (p<0.05) as compared with that from zipeprol dihydrochloride oral solution. Therefore, it may be suggested that $Eudragit^{\cirledR}$ RS 100 coated zipeprol dihydrochloride microcapsules can be used as a sustained release medication.

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The study for improve a method of Marker auto- identification (마커 자동 인식 향상 방법에 관한 연구)

  • Lee, Hyun-Seob
    • Korean Journal of Applied Biomechanics
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    • v.13 no.1
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    • pp.23-38
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    • 2003
  • The purpose of this study is to develop an improved marker auto-identification algorithm for reduce of data processing time through improve the efficiency of noise elimination and marker separation. The maker auto-identification algorithm was programming named KUMAS used Delphi language. For the study, various experiments were conducted for the verification of KUMAS. and compared two systems of established with the KUMAS. Four different motions - cycling, gait, rotation, and pendulum -, were selected and tested. Motions were filmed 30Hz frames rate per second. ${\chi}^2$ used for statistical analysis. Significant level were ${\alpha}=.05$. The test results were as follow. 1. Increased the success ratio of marker auto-identification. 2. The efficiency of marker auto-identification was remarkably improved through marker separation, noise elimination. 3. The marker auto-identification ability was improved in 2D-image plane include the 3D motion. 4. Significant different were found between KUMAS and B-SYS(established system) with non-input the artificial noise frames, input the artificial noise frames and total frames.

Study of micro-plastics separation from sea water with electro-magnetic force

  • Nomura, Naoki;Mishima, Fumihito;Nishijima, Shigehiro
    • Progress in Superconductivity and Cryogenics
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    • v.23 no.3
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    • pp.10-13
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    • 2021
  • The method of removing micro-plastics from sea water has been developed using electro-magnetic force. Plastics are difficult to decompose and put a great load on the marine environment. Especially a plastic with a size of 5 mm or less is defined as micro-plastic and are carried by ocean currents over long distances, causing global pollution. These are not easily decomposed in the natural environment. The Lorentz force was generated in simulated sea water and its reaction force was applied to the micro-plastic to control their motion. Lorentz force was generated downward and the reaction force to the plastics was upward. The plastic used in the experiment was polystyrene with a diameter of 6 mm, and the density was 1.07 g/cm3. The polystyrene sphere levitated at the current density of 0.83 A/cm2 and the external field of 0.87T. The particle trajectory calculation was also made to design separation system using superconducting magnet.

A New Experimental Error Reduction Method for Three-Dimensional Human Motion Analysis

  • Mun, Joung-Hwan
    • Journal of Biomedical Engineering Research
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    • v.22 no.5
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    • pp.459-468
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    • 2001
  • The Average Coordinate Referenee System (ACRS) method is developed to reduce experimental errors in human locomotion analysis. Experimentally measured kinematic data is used to conduct analysis in human modeling, and the model accuracy is directly related to the accuracy of the data. However. the accuracy is questionable due to skin movement. deformation of skeletal structure while in motion and limitations of commercial motion analysis system . In this study. the ACRS method is applied to an optically-tracked segment marker system. although it can be applied to many of the others as well. In the ACRS method, each marker can be treated independently. as the origin of a local coordinate system for its body segment. Errors, inherent in the experimental process. result in different values for the recovered Euler angles at each origin. By employing knowledge of an initial, calibrated segment reference frame, the Euler angles at each marker location can be averaged. minimizing the effect of the skin extension and rotation. Using the developed ACRS methodology the error is reduced when compared to the general Euler angle method commonly applied in motion analysis. If there is no error exist in the experimental gait data. the separation and Penetration distance of the femoraltibial joint using absolute coordinate system is supposed to be zero during one gait cycle. The separation and Penetration distance was ranged up to 18 mm using general Euler angle method and 12 mm using the developed ACRS.

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Development of an Automated Diffusion Scrubber-Conductometry System for Measuring Atmospheric Ammonia

  • Lee, Bo-Kyoung;Lee, Chong-Keun;Lee, Dong-Soo
    • Bulletin of the Korean Chemical Society
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    • v.32 no.6
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    • pp.2039-2044
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    • 2011
  • A semi-continuous and automated method for quantifying atmospheric ammonia at the parts per billion level has been developed. The instrument consists of a high efficiency diffusion scrubber, an electrolytic on-line anion exchange device, and a conductivity detector. Water soluble gases in sampled air diffuse through the porous membrane and are absorbed in an absorbing solution. Interferences are eliminated by using an anion exchange devises. The electrical conductivity of the solution is measured without chromatographic separation. The collection efficiency was over 99%. Over the 0-200 ppbv concentration range, the calibration was linear with $r^2$ = 0.99. The lower limit of detection was 0.09 ppbv. A parallel analysis of Seoul air over several days using this method and a diffusion scrubber coupled to an ion chromatography system showed acceptable agreement, $r^2$ = 0.940 (n = 686). This method can be applied for ambient air monitoring of ammonia.