• Title/Summary/Keyword: End effect

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Studies on the Factors Influencing the Growth of Swine Testicle Cells and the END Effect of Hog Cholera Virus (우혈청(牛血淸)(분획(分劃))의 돈정소세포(豚精巢細胞) 발육(發育)과 돈(豚)콜레라 바이러스 END효과(效果)에 미치는 인자(因子)에 관한 연구(硏究))

  • Jeon, Yun-seong
    • Korean Journal of Veterinary Research
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    • v.26 no.2
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    • pp.265-276
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    • 1986
  • The bovine serum factor influencing the growth of swine testicle (ST) cell and the END effect of hog cholera SN test was studied. Throughout the experimental studies. following results were obtained and summarized. 1. Bovine whole serum of 16(76.2%) and 4(19.0%) samples out of 21 have shown a positive ST cell growth and the END effect, respectively. However, all of 21(100%) and 8(38.1%) samples out of 21 serum supernatant fractions, prepared from the bovine whole serum, have shown positive ST cell growth and END effect, respectively. 2. In the SDS-polyacrylamide gel electrophoretic analysis of the bovine whole serum and the supernatant fractions, ST cell growth inhibiting factor was proved present in globulin fraction and in whole gel plate as a diffusible component. 3. The END ineffective component present in the whole serum and its supernatant fraction was proved to be BVDV neutralizing antibody. 4. The difference of osmolarity, optical density, pH, degree of precipitant formation following heat cold treatment, A/G ratio as we11 as electrophoretic pattern and NDV SN index of the samples were not correlated to the degree of 57 cell growth and to the END effectiveness.

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Optimization of outer core to reduce end effect of annular linear induction electromagnetic pump in prototype Generation-IV sodium-cooled fast reactor

  • Kwak, Jaesik;Kim, Hee Reyoung
    • Nuclear Engineering and Technology
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    • v.52 no.7
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    • pp.1380-1385
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    • 2020
  • An annular linear induction electromagnetic pump (ALIP) which has a developed pressure of 0.76 bar and a flow rate of 100 L/min is designed to analysis end effect which is main problem to use ALIP in thermohydraulic system of the prototype generation-IV sodium-cooled fast reactor (PGSFR). Because there is no moving part which is directly in contact with the liquid, such as the impeller of a mechanical pump, an ALIP is one of the best options for transporting sodium, considering the high temperature and reactivity of liquid sodium. For the analysis of an ALIP, some of the most important characteristics are the electromagnetic properties such as the magnetic field, current density, and the Lorentz force. These electromagnetic properties not only affect the performance of an ALIP, but they additionally influence the end effect. The end effect is caused by distortion to the electromagnetic field at both ends of an ALIP, influencing both the flow stability and developed pressure. The electromagnetic field distribution in an ALIP is analyzed in this study by solving Maxwell's equations and using numerical analysis.

Thrust Performance Improvement of a Linear Induction Motor

  • Lee, Hyung-Woo;Park, Chan-Bae;Lee, Byung-Song
    • Journal of Electrical Engineering and Technology
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    • v.6 no.1
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    • pp.81-85
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    • 2011
  • The end effect of a linear induction motor (LIM) has been known for several decades, especially in high speed operation. The exit part of the primary is not dealt as extensively as the entry part because of its minor effect. However, the exit part is one of the keys to weaken the dolphin effect, which occurs in high speed operation. In this paper, the concept of the virtual primary core is introduced, and chamfering of the primary outlet teeth is proposed to minimize the longitudinal end effect at the exit zone. For this, LIM for the high-speed train is designed and analyzed by using finite element method. Results confirm that chamfering can improve thrust performance effectively.

The Auxiliary Core Optimal Design of PMLSM to Reduce Detent Force by End Effect (단부효과에 의한 PMLSM의 디텐트력 저감을 위한 보조코어 최적설계)

  • Jang, Ki-Bong;An, Ho-Jin;Kim, Gyu-Tak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.3
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    • pp.543-548
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    • 2010
  • There are produced the detent force caused by slot-teeth structures, end-effect and parallel magnetization of permanent magnet in permanent magnet linear synchronous motor. In this paper, we proposed to establish the auxiliary core for reducing detent force which is generated the discontinuity of magnetic circuits by end effect. The optimal design of the auxiliary core used a finite element analysis and design of experiment. To demonstrate the validity of the paper, the experiment results are compared with analysis ones.

A Study on the Problem of Permanent Magnet Linear Synchronous Motor According to End Effect (영구자석형 선형동기전동기의 단부효과에 의한 문제점 연구)

  • Kim, Duk-Hyun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.12
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    • pp.71-77
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    • 2010
  • A discontinuity of magnetic circuits according to the end effect is generated in PMLSM. And magnetic state of the 3 phase coils becomes unbalanced. Due to the unbalanced magnetic state, the unbalanced flux linkage, back electro-magnetic force and inductance of the 3 phase coils appear. In result, the circulating current is generated by unbalanced inductance even if the input voltages are in balanced state. Then the thrust and efficiency are decreased because of the circulating current. Therefore, in this paper, the unbalanced inductance and the thrust reduction according to discontinuity of magnetic circuits are analyzed by FEA(2D). To demonstrate the validity of the analysis results, the experiment results are compared with analysis results.

The Improved Quasi-3D FE Analysis on the AFPM Motor (개선된 Quasi-3D FEM을 통한 AFPM 전동기의 해석)

  • Woo, Dong-Kyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.5
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    • pp.773-776
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    • 2016
  • In the quasi-3D finite element(FE) anlysis, the overall characteristics of axial flux permanent magnet(AFPM) motor could be composed of each computation region. However, A drawback of quasi-3D FEM is not to consider the end effect on the stack end. To address this problem, an improved quasi-3D FE analysis which considers the end effect of the AFPM motor was proposed. From results the 3D FE analysis, the validity of the proposed method is verified.

Static Characteristics of Electrodynamic Maglev System (반발식 자기부상열차의 정특성해석)

  • 홍순흠;이양수;차귀수;한송엽
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.7
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    • pp.1067-1074
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    • 1994
  • This paper deals with the combined levitation and guidance EDS(Electrodynamic Suspension) Maglev system. Levitation and guidance forces generated in figured-of-eight coil are examined. End effect of Superconducting magnets is considered in that the air gap flux has been calculated using the finite number of magnets. Induced emfs and currents of ground coils are given as results. Eletromagnetic forces vary according to the built-in position of magnets. Levitation forces of the first magnet pair are the smellest and those of the second one are the largest. This result shows that the end effect of SCMs should be considered in a concentrated magnet system.

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Characteristic Analysis of a Linear Induction Motor considering Static and Dynamic End Effect (정적 및 동적 단부효과를 고려한 선형유도전동기의 특성 해석)

  • Kim, Dae-Kyong;Kwon, Byung-Il;Woo, Kyung-Il
    • Proceedings of the KIEE Conference
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    • pp.981-983
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    • 2000
  • Linear induction motors have static and dynamic end effects due to its finite core length, so that per-phase impedances are asymmetric and the air gap flux distribution is distorted. Because of these points the d-q equivalent circuit model considering both end effects has not been exactly completed. So this paper proposes a characteristic analysis method considering both static and dynamic end effect of the LIM. This method is to utilize asymmetric d-q equivalent circuit model with dynamic end effect coefficient. As a result, it is shown that the simulation results have a good agreement with experimental ones.

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A study on the speed characteristic of linear induction motor (유도형 리니어 모터의 속도특성에 관한 연구)

  • CHUNG B. H.;CHOI M. H.;CHO G. B.;BAEK H. L.;SEO J. Y.;KIM D. G.
    • Proceedings of the KIPE Conference
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    • pp.151-154
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    • 2004
  • To use the SLIM for servo system, the exact account of thrust about the initial speed is needed, but analyzing by equivalent circuit analyzing methode such as rotary induction motor, the error occurs because of the end effect. So, we applied the equivalent circuit considering the end effect of SLIM in this paper. The current control system is advanced the space vector pulse width modulation by using high arithmetic performance microprocessor such as DSP. In this paper, we use the dynamic characteristic analyzing methode that can calculate efficiently the end effect by using equivalent circuit methode in the operating SLIM system modeling and examine the output characteristics of SVPWM with PI controller.

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The Vector Control of SLIM Considering End-effect (단부효과를 고려한 편측형 선형유도전동기 벡터제어)

  • 조금배;임홍우;장용해;백형래
    • The Transactions of the Korean Institute of Power Electronics
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    • v.7 no.4
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    • pp.395-403
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    • 2002
  • The advanced space vector PWM is Implemented for the control system using high arithmetic performance microprocessor such as DSP. It is difficult to realize the complicate SLIM which is applied to SVPWM system, but widely used in vector control system or servo control system for AC motor because of its high performance in current control. In this paper, we use the dynamic characteristic analyzing method that can calculate efficiently the end effect by using equivalent circuit methode in the operating SLIM system modeling and examine the dynamic characteristics of SVPWM with PI controller.