• Title/Summary/Keyword: Migration velocity

Search Result 129, Processing Time 0.028 seconds

Flow Visualization of Blood Cell and Detection of Cell Depleted Layer Using a Confocal Laser Scanning Microscope (공초점 레이저 주사 현미경을 이용한 혈구 유동가시화 및 세포공핍층 측정에 관한 연구)

  • Lim, Soo-Hee;Kim, Wi-Han;Lee, Ho;Lee, Choon-Young;Park, Cheol-Woo
    • Journal of the Korean Society of Visualization
    • /
    • v.8 no.1
    • /
    • pp.46-52
    • /
    • 2010
  • In the present study, we employed the confocal laser scanning microscopy (CLSM) system to visualize the blood flow field with $1{\times}1{\mu}m^2$ spatial resolution. Based on the confocal microscopic image of red blood cells (RBCs), we performed the velocity vector field measurement and evaluated characteristics of cell migration from the cell depleted layer thickness calculation. The rat and mouse's blood were supplied into a micro glass tubes in vitro. The line scanning rate of confocal microscopy was 15 kHz for a $500{\times}500$ pixels image. As a result, the red blood cell itself can be used as a tracer directly without any kind of invasive tracer particle to get the velocity vector field of blood flow by performing particle image velocimetry (PIV) technique.

Analysis on particle deposition onto a heated, horizontal free-standing wafer with electrostatic effect (정전효과가 있는 가열 수평웨이퍼로의 입자침착에 관한 해석)

  • Yoo, Kyung-Hoon;Oh, Myung-Do;Myong, Hyon-Kook
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.21 no.10
    • /
    • pp.1284-1293
    • /
    • 1997
  • The electrostatic effect on particle deposition onto a heated, Horizontal free-standing wafer surface was investigated numerically. The deposition mechanisms considered were convection, Brownian and turbulent diffusion, sedimentation, thermophoresis and electrostatic force. The electric charge on particle needed to calculate the electrostatic migration velocity induced by the local electric field was assumed to be the Boltzmann equilibrium charge. The electrostatic forces acted upon the particle included the Coulombic, image, dielectrophoretic and dipole-dipole forces based on the assumption that the particle and wafer surface are conducting. The electric potential distribution needed to calculate the local electric field around the wafer was calculated from the Laplace equation. The averaged and local deposition velocities were obtained for a temperature difference of 0-10 K and an applied voltage of 0-1000 v.The numerical results were then compared with those of the present suggested approximate model and the available experimental data. The comparison showed relatively good agreement between them.

Monitoring and detecting $CO_2$ injected into water-saturated sandstone with joint seismic and resistivity measurements (탄성파 및 비저항 동시측정에 의한 수포화 암석시료에 주입된 $CO_2$ 모니터링 및 탐지)

  • Kim, Jong-Wook;Matsuoka, Toshifumi;Xue, Ziqiu
    • Geophysics and Geophysical Exploration
    • /
    • v.14 no.1
    • /
    • pp.58-68
    • /
    • 2011
  • As part of basic studies of monitoring carbon dioxide ($CO_2$) storage using electrical and seismic surveys, laboratory experiments have been conducted to measure resistivity and P-wave velocity changes due to the injection of $CO_2$ into water-saturated sandstone. The rock sample used is a cylinder of Berea sandstone. $CO_2$ was injected under supercritical conditions (10 MPa, $40^{\circ}C$). The experimental results show that resistivity increases monotonously throughout the injection period, while P-wave velocity and amplitude decrease drastically due to the supercritical $CO_2$ injection. A reconstructed P-wave velocity tomogram clearly images $CO_2$ migration in the sandstone sample. Both resistivity and seismic velocity are useful for monitoring $CO_2$ behaviour. P-wave velocity, however, is less sensitive than resistivity when the $CO_2$ saturation is greater than ~20%. The result indicates that the saturation estimation from resistivity can effectively complement the difficulty of $CO_2$ saturation estimations from seismic velocity variations. By combining resistivity and seismic velocity we were able to estimate $CO_2$ saturation distribution and the injected $CO_2$ behaviour in our sample.

Comparison & Analysis for Fine Sand Migration in Filter (조립 Filter내에서 세상의 이동현상에 대한 비교분석)

  • Kim, Hyun-Ki;Kwon, Moo-Nam
    • Current Research on Agriculture and Life Sciences
    • /
    • v.16
    • /
    • pp.15-23
    • /
    • 1998
  • This experiment did comparison and analysis that protected soil particle migration have affect on function of the filter and therefore fall function of the filter. Results obtained are as follows: 1.High water head makes to be much movement of fine sand and out flow of particle to the outside. The filter have large opening size that reached stability an early stage, but much fine sand is washed away. If the velocity turns fast and becomes small, blocking phenomenon is remarkable nearby the filter-sand interface. 2. The movement of fine sand that effect on function of filter depend on opening size and change of water head. Under the same condition, USCE filter and USSPL filter is reached earlier than other filter that is stability of stage, because it's opening size is large. 3. Residual quantity of fine sand migration was largly come out in order of USSPL, USCE, USBR, Newton & Hurley, Bertram filter. 4. The time required to stability of flow was taken less in order of Bertram, Newton & Hurley, USBR, USSPL, USCE filter and coefficient of permeability was highly come out in order of USBR, Bertram, Newton & Hurley, USSPL, USCE filter. 5. It proved that USCE and USSPL is suitable for the filter criteria.

  • PDF

Influence of Operating Conditions on the Performances of a Continuous Electrodeionizatioin with Cation Exchange Textile (CEDI-CET)

  • Song, Jung-Hoon;Lee, Jin-Woo;Lee, Hong-Joo;Moon, Seung-Hyeon
    • Korean Membrane Journal
    • /
    • v.9 no.1
    • /
    • pp.18-26
    • /
    • 2007
  • The transport and removal characteristics of cobalt ions were investigated in a continuous electrodeionization with cation exchange textile (CEDI-CET). It was shown that the removal properties of cobalt ions are strongly dependent on the operating parameters such as temperature, flow velocity, and the solution pH. The transport and removal of cobalt ions was mainly related to the sorption on the surface and the convection and electro-migration through the ion exchange medium. In this study, the CEDI-CET showed good process performance for the removal of metal ions compared with the conventional CEDI with resins.

Power and Collection Characteristics of Superimposed Pulse Electrostatic Precipitator (중첩펄스 전기집진기의 전력 및 집진특성)

  • Seo, Gyeong-Won;Lee, Chang-Sin;Lee, Jeong-Seok;Chae, Jae-U
    • The Transactions of the Korean Institute of Electrical Engineers C
    • /
    • v.49 no.3
    • /
    • pp.177-185
    • /
    • 2000
  • In this study, the characteristics of various electricity and high resistivity ash collection were measured at superimposed nanosecond pulse energization. The pulse was generated through the hydrogen thyratron. Superimposed pulse was nanosecond duration pulse that had fast pulse rising time 100[ns], short pulse width 500∼850[ns] and pulse fall time 400∼750[ns]. The results of this study are summarized as followings; Frist, compared with the DC ESP(electrostatic precipitator), superimposed pulse ESP could induce higher peak voltage, and had the about 30[%] reduction of ESP collection area and 50∼80[%] reduction of power consumption. showing the same efficiency. Second, enhancement factor H had 1.9∼3.6 with the increase of migration velocity.

  • PDF

Analysis of Genome and Species Relationships in Cotton by Disc Electrophoresis (Disc Electrophoresis에 의한 면화의 Genome과 종간관계 분석)

  • Jong-Tol Choi;Byong-Ho Chang
    • KOREAN JOURNAL OF CROP SCIENCE
    • /
    • v.13
    • /
    • pp.73-76
    • /
    • 1973
  • Protein spectra from 6 species of Gossypium were obtained by disc electraphoresis of seed extracts. Protein extracts were made by soaking 0.5g. of seed in 15ml of Tris-glycine buffer for 24 hours. Gels 24 hours. Gels were stained in 0.5% Amido Black solution for 1 hour, and destained in 7% acetic acid for 72 hours. Nine to 15 bands were visible in each gel. Homologies of Protein bands among the species were determined by migration velocity. Evidences obtained from electrophoretic separation of seed Protein were consistent with those from genetic, cytological, morphological and Phenogenetic methods regarding the origin of New World cultivated cottons. Possibility, however, does not exist to exclude Gossypium herbaceum from one of the Progenitors of New World cultivated cottons from electrophoretic evidences alone.

  • PDF

Efficient calculation method of derivative of traveltime using SWEET algorithm for refraction tomography

  • Choi, Yun-Seok;Shin, Chang-Soo
    • 한국지구물리탐사학회:학술대회논문집
    • /
    • 2003.11a
    • /
    • pp.402-409
    • /
    • 2003
  • Inversion of traveltime requires an efficient algorithm for computing the traveltime as well as its $Frech\hat{e}t$ derivative. We compute the traveltime of the head waves using the damped wave solution in the Laplace domain and then present a new algorithm for calculating the $Frech\hat{e}t$ derivative of the head wave traveltimes by exploiting the numerical structure of the finite element method, the modem sparse matrix technology, and SWEET algorithm developed recently. Then, we use a properly regularized steepest descent method to invert the traveltime of the Marmousi-2 model. Through our numerical tests, we will demonstrate that the refraction tomography with large aperture data can be used to construct the initial velocity model for the prestack depth migration.

  • PDF

Effect of Solvent Mixture Ratio on Rheology Property of Slurry and Thickness Control of Ceramic Green Sheets (유기 용매 혼합비에 따른 슬러리의 유동 특성과 세라믹 그린 쉬트의 두께 제어)

  • Kim, Jun-Young;Kim, Seung-Taek;Park, Jong-Chul;Yoo, Myong-Jae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.21 no.3
    • /
    • pp.236-241
    • /
    • 2008
  • The effect of organic solvent mixture ratio on the rheology property of slurry and thickness control of ceramic green sheet was investigated. For selecting a suitable dispersant multiple light scattering method was used to evaluate the particle migration velocity and variation of clarification layer thickness. Using the selected dispersant the dispersion property of solution according to solvent mixture ratio was investigated. Binder and plasticizers were added to formulate slurries and their viscosity was evaluated according to solvent mixture ratio. Ceramic green sheets with average thickness of 30, 50 urn were fabricated via tape casting and their thickness tolerances measured. As a result according to solvent mixture ratio the solution and slurry properties varied and for the mixture ratio of ethanol/toluene of 80/20 the ceramic green sheet with the lowest thickness tolerance was obtained.

Measurement of Low-Frequency Ocean Noise by a Self-Recording Hydrophone (자동기록식 수중청음기를 이용한 저주파 해양잡음의 측정)

  • Kim, Bong-Chae;Kim, Byoung-Nam;Cho, Hong-Sang
    • Ocean and Polar Research
    • /
    • v.29 no.4
    • /
    • pp.311-316
    • /
    • 2007
  • Ocean noise may be used for monitoring wind speed and rainfall rate on the sea surface, as well as for tracking whales' migration routes. In particular, low-frequency ocean noise has recently been of concern with relation to the behavior of marine mammals. Low-frequency ocean noise has been increasing over the past few decades due to increase of ship traffic and offshore oil industry activities. Mechanical noise such as flow noise and cable strumming noise may be induced if low-frequency ocean noise is measured by cabled traditional hydrophone in high current areas. To successfully measure low-frequency ocean noise in a shallow water environment with strong current, we developed a self-recording hydrophone. This paper describes the main configurations of the self-recording hydrophone and presents some results on measured data.