• Title/Summary/Keyword: resistive-joint

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Characterization of resistive-and supercodncuting-joint of Bi-2223 superconductor tape (Bi-2223 초전도선재의 상전도- 및 초전도-접합부 특성평가)

  • 김정호;지봉기;박형상;임준형;오승진;주진호;황보훈;나완수
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.13 no.3
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    • pp.247-253
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    • 2000
  • We evaluated the electric properties of Bi-2223 jointed tapes processed by both resistive-and superconducting-joint methods. For resistive-joint. filler materials of wood metal Pb/Sn. In and silver paste were used whereas for superconductive-joint lap joint method was used. In the resistive joint tape. critical transport property(CCR) n-value and contact resistance were observed to be in the range of 10-85% 1-8,9. and 0.71x10$\^$-6/-0.13x10$\^$-6/Ω, respectively. depending on their filler materials. Specifically it is believed that the electrical properties of resistive joint tape are significantly related to the resistivity of filler materials. On the other hand the CCR of superconductin joint type was varied 55 to 85% with uniaxial pressure probably due to the irregular microstructure in the transition region.

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Development and properties of jointed Bi-2223 superconductor tape

  • Kim, Jung-Ho;Ji, Bong-Ki;Park, Hyung-Sang;Kim, Ho-Jin;Oh, Seung-Jin;Kim, Joong-Seok;Joo, Jin-Ho;Nah, Won-Soo
    • 한국초전도학회:학술대회논문집
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    • v.10
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    • pp.298-303
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    • 2000
  • We evaluated the electric properties of Bi-2223 jointed tapes processed by both resistive- and supercondcuting-joint methods. For the resistive-joint, filler materials of wood metal, Pb/Sn, In, and silver paste were used, whereas, for the superconductive-joint, the lap joint method were used. In the resistive-joint tape, it was observed that the electrical properties such as current transport property, n-value, and contact resistance of the tape were significantly related to the resistivity of filler materials. On the other hand, in the superconducting-joint tape, the current transport property was dependent on the uniaxial pressure. Specifically, the current transport property varied 50 to 80% with uniaxial pressure, probably due to the irregular microstructure in the transition region.

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Numerical analysis about current non-uniformity in superconducting CICC (cable-in-conduit conductor) joint (초전도 관내연선도체 접합부에서의 전류 불균일에 대한 수치적 분석)

  • Lee, Sang-Il;Jeong, Sang-Kwon;Choi, Sung-Min;Park, Kap-Rai
    • Progress in Superconductivity and Cryogenics
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    • v.9 no.3
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    • pp.41-45
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    • 2007
  • This paper presents transport current non-uniformity in a joint for superconducting multistage cable-in-conduit conductor (CICC) and relaxation in the CICC. The joint is considered to have a current loop linked to an external magnetic field so that it becomes an emf voltage source. It is numerically analyzed using an electrical transmission line model. The inductive current in a resistive joint is compared to that of a non-resistive joint when the ramping field is applied vertically to the joints. Regarding the parameter values of the model. a full scale $Nb_3Sn$ CICC and a strand-to-strand (STS) joint for the toroidal field magnet of the KSTAR (Korea Superconducting Tokamak Advanced Research) device are referenced to. It is found that the resistive joint prevents the current from rising too much and enhances decaying the current when the ramping stops. The 'flattop' current is found to be proportional to the ramp rate of the field (dB/dt). The relaxation length, which is defined as the length within which the maximum induced current falls by 1/e. is found to saturate within 0.27m.

Effects of Elastic Band-Resistive Exercise using Audio-visual Medium on Pain, Proprioceptive Sense, and Motor Function in Adult Females with Chronic Neck and Shoulder Pain (만성 목-어깨 통증이 있는 여성 성인에게 시청각 매체를 활용한 탄력밴드 저항운동이 통증, 고유수용성 감각과 운동기능에 미치는 영향)

  • Nam Gi Lee;Jeong-Woo Lee
    • Journal of Korean Physical Therapy Science
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    • v.31 no.1
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    • pp.33-45
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    • 2024
  • Background: This study aimed to investigate the effect of elastic band-resistive exercise using audio-visual medium on pain, proprioception, and motor function in adults with chronic neck and shoulder pain. Design: One group pretest-posttest follow-up experimental design. Method: Twenty adult women with neck and shoulder pain voluntarily participated in this study. Elastic band-resistive exercise using audio-visual medium including cervical flexion and extension, shoulder external rotation, and scapular retraction-protraction motions was conducted 5 times a week for 3 weeks. The Numerical Rating Scale, pressure threshold tool, CROM goniometer, and Image J software were used to assess subjective pain level, tenderness threshold (pain), joint position sense error (proprioception), joint range of motion, and postural alignment (motor function), respectively. Result:: The pain intensity and threshold and joint position sense error showed significant decreases after the intervention, whereas the joint range of motion angle revealed significant increases. The postural alignment including forward head posture and rounded shoulder revealed significant improvements after the intervention. Conclusions: Therefore, we suggest that elastic band-resistive exercise through audio-visual medium would be helpful in preventing and managing pain and physical dysfunction in individuals with chronic neck and shoulder pain, and then it would support the development of health management-related online education content.

A study of joint resistance between (Bi, Pb$)_{2}$$Sr_{2}$$Ca_{2}$$Cu_{3}$$O_{x}$ tapes ((Bi, Pb$)_{2}$$Sr_{2}$$Ca_{2}$$Cu_{3}$$O_{x}$선재간의 접합저항 연구)

  • 김정호;김규태;주진호;최세용;나완수;강형구;고태국;하홍수;오상수
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2003.02a
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    • pp.123-125
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    • 2003
  • We joined 19-multifilamentary (Bi, Pb)$_2$Sr$_2$Ca$_2$Cu$_3$O$_{x}$ Superconducting tapes and fabricated double-pancake coils by using resistive- and superconducting-joint methods. The joint resistance of the coils were characterized by the field decay technique and standard four-probe method. It was evaluated that joint resistance was 3.21$\times$10$^{-11}$ $\Omega$ in the superconducting-joint coil, which is approximately 4 orders of magnitude smaller than that in the resistive-joint coil (107$\times$10$^{-9}$ $\Omega$). The low value of joint resistance obtained by superconducting-joint is expected to be suitable for the practical applications in the persistent current mode.e.

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Arthro Kinematic Approach (관절 운동학적 치료접근법)

  • Lim, Sung-Su;Oh, Seung-Kil;Kim, Ju-Sang
    • Journal of Korean Physical Therapy Science
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    • v.2 no.2
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    • pp.545-562
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    • 1995
  • The purpose of this paper was to provide the understanding of theory, technique, clinical use about arthro kinematic approach. Difference between AKA and Joint mobilization was seen through Table 1, and the relation between AKA and Athro kinematics was seen through Table 2. Examples of AKA techniques were as follow ; 1. Cervical intervertebral joint, left $C_{2/3}$ 2. Thoracic intervertebral joint, left $T_{5/6}$ 3. Sacroiliac joint, left (1) Nutation-upward gliding (2) Nutation-downward gliding (3) Superior distraction (4) Inferior distraction 4. 1st. costovertebral joint, left 5. 2nd. sternocostal joint, left 6. AKA-streching exercise 7. AKA - resistive exercise Symptoms, diagnosis, treatment were discribed for clinical use, and they were expected further that clinical application of AKA might clarify many of joint dysfunction.

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Estimation of joint and index dissipation in HTS tape (고온초전도 선재의 접합 및 인덱스손실 평가)

  • 김정호;임준형;장석헌;김규태;주진호;최세용;나완수;강형구;고태국
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2003.10a
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    • pp.59-62
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    • 2003
  • We fabricated two HTS closed coils by using resistive-joint method and the joint resistance of the coil was estimated by field decay technique at 77 K. In addition, we used the Runge-kutta method for the numerical analysis to estimate the decay properties. The joint resistances were evaluated as a function of critical current of HTS closed coil and external field strength of excitation coil. It was observed that joint resistance was independent of critical current and external field strength. It was estimated that joint resistance was 8.0$\times$10$^{-9}$ $\Omega$ to 11.9$\times$10$^{-9}$ $\Omega$ for coils of contact length for 7 cm.

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The Effect of Eccentric Strengthening Exercise on Athletes after Shoulder Rotator Cuff Tear (운동선수들의 견관절 회전근 손상 이후 등속성 측정을 통한 원심성 근력운동의 효과)

  • Kim, Jwa-Jun;Kim, Dae-Kyeong;Ha, Kyung-Jin
    • PNF and Movement
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    • v.12 no.1
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    • pp.33-37
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    • 2014
  • Purpose: In this research, the properties of the shoulder joint were measured through eccentric resistive exercise with the patients who have rotator cuff tear of shoulder joints as the targets. Methods: 23 patients who have pain due to the rupture of rotator cuff on shoulder joints were selected and divided into Exercise group (12) and Control group (11). Two groups executed exercise for 30 minutes 3 days a week. Exercise group had executed eccentric resistive exercise, and the Control group executed Complex exercise. Results: In external rotation $180^{\circ}/s$, $240^{\circ}/s$, the Exercise group showed to be an average of 8% higher than the Control group. For Internal rotation $90^{\circ}/s$, $180^{\circ}/s$, $240^{\circ}/s$ the Exercise group showed to be an average of 30% higher that the Control group. Conclusion: To lessen the rupture of rotator cuff on shoulder joints, muscles strengthening is very important across various methods of eccentric exercise programs which are external/internal rotators of the shoulder joint needed for throwing. This is effective in preventing injury and improving rotation.

Development of Preliminary Advanced Aquatic Exercise Program for Persons with Arthritis (관절염 환자를 위한 중급수중운동 프로그램 개발연구)

  • Kim, Jong-Im;Park, In-Hyae;Eum, Ok-Boon;Choi, Hee-Kwon;Jeong, Yeong-Hee
    • Journal of muscle and joint health
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    • v.15 no.1
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    • pp.24-32
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    • 2008
  • Purpose: This study was conducted to develop an advanced aquatic exercise program for the patients with arthritis. Method: This study subjects were six aquatic exercise program instructors of Korean Society Muscle and Joint Health. They withheld several meeting to develop advanced aquatic exercise program. Results: The basic aquatic exercise program which were used since 1996 in Korea consisted of 9 units of ROM exercise in water. The advanced aquatic exercise program for the patients with arthritis consist of 12 units with complex and resistive exercise. Conclusion: This preliminary advanced aquatic exercise program for the patients with arthritis should be investigate for the effectiveness to build a more concrete evidence and utilization.

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