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RISS 인기검색어
- 검색키워드
- 저자 : Kuzumaki, Takuya (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Appropriate Tensile Mode and Timing of Applying Tension to Promote Tendon Gel Regeneration
Toru Kuzumaki,Katsufumi Yamazaki,Keiichi Suzuki,Kojun Torigoe 한국조직공학과 재생의학회 2017 조직공학과 재생의학 Vol.14 No.4
‘‘Tendon gel’’ secreted from a parent tendon is regenerated for tendon repair by applying tension. However, the details of the tensile stimulus have not been clarified. This study aimed to evaluate an appropriate tensile stimulus mode and the optimal timing of applying tension to promote tendon gel regeneration. Tendon gel was prepared using a film model method in mice and was preserved in vivo for 3, 5, and 10 days. Unlike tendon gel on day 3 or day 5, a fibrous structure developed in the tendon gel on day 10 when tension was applied. Infrared spectroscopy revealed that characteristic peaks appearing for the tendon gel on days 3 and 5 disappeared on day 10. Disappearance of the peaks indicated maturity of the tendon gel, and it showed the optimal timing for tension application to the tendon gel. The effect of tensile load on tendon gel preserved for 10 days was investigated using a tensile test, a creep test, or a cycle test. In the tensile test, tendon gel was elongated into a thin cord of collagen fibers with an increase in stress, and the maximum diameter of the collagen fiber was approximately 50 times larger than that in the normal Achilles tendon of mice. The results suggest that the diameter of the oriented collagen fiber is controllable by adjusting the applied load and the time in mature tendon gel.
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Nonvortical Rashba Spin Structure on a Surface with<sub>C1h</sub>Symmetry
Annese, Emilia,Kuzumaki, Takuya,Mü,ller, Beate,Yamamoto, Yuta,Nakano, Hiroto,Kato, Haruki,Araki, Atsushi,Ohtaka, Minoru,Aoki, Takashi,Ishikawa, Hirotaka,Hayashida, Takashi,Osiecki, Jacek R.,Miyamo American Physical Society 2016 Physical Review Letters Vol.117 No.1
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폐기물매립지에서 지반의 부분침하로 인한 지오멤브레인 차수막의 장력 측정을 위한 non-linear ELASTIC MODEL
( Sadahiko Usami ),( Kenji Kuzumaki ),( Shigeyoshi Imaizumi ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2
HDPE, EPDM, TPE(PE, PP)와 같은 다양한 지오멤브레인은 침출수가 주변지반으로 침출되지 않도록 폐기물매립지의 바닥 및 사면에 포설된다. 지하수를 채수하기 위한 유공관 또한 지오멤브레인이 포설된 바닥층 아래에 있다. 일반적으로 지반토를 파낸 구멍에 유공관을 묻고 흙으로 덮는다. 흙을 채울때 충분히 압축하지 않으면, 매립폐기물의 중량에 따른 압착이 일어나 위에 포설된 지오멤브레인의 부분침하를 초래할 것이다. 이러한 부분침하는 지오멤브레인을 인장변형을 초래할 것이며, 큰 인장변형으로 인하여 지오멤브레인은 손상될 것이다. 본 연구에서 저자는 부분침하와 모래층 사이에 포설된 지오멤브레인 내에 형성된 인장변형과의 관계를 평가하기 위하여 실내실험을 행하였다. 또한 폐기물매립지에서 지반의 부분침하에 의해 발생된 지오멤브레인의 최대 인장변형을 측정하기 위하여 Modified Elastic Model(MEM)을 유도하였다. 이 모델에서는 지오멤브레인의 stress(길이 방향변형)와 strain(응력)의 관계가 쌍곡선 (hyperbolic) 으로 나타나는 것으로 가정하였다. Relative displacement와 frictional stress는 여전히 rigid plastic으로 가정된다. 저자는 MEM이 stress와 strain 사이에 선형관계가 있는 것으로 가정하는 old Elastic Model(EM)에 비하여 주어진 인장(elongation)에 대하여 더 큰 최대인장변형을 나타냄을 보이고 있다. Many types of geomembrane, for example, HDPE, EPDM and TPE(PE,PP) are placed on the bottom and side slope in waste landfill for the leachate not to infiltrate into the surrounding ground. The perforated pipe to collect groundwater is also placed under the bottom liner including the geomembrane. The pipe is usually varied into the trench that is ditched in base ground and then filled with soil. In case compaction work to fill the soil is not so enough, the compression due to the weight of buried waste may occur and result in the partial settlement of the geomembrane liner spread over it. This partial settlement will surely demand the stretch of the geomembrane. Large stretch means large tensile strain, which leads to break of geomembrane. The authors conducted trapped door tests to evaluate the relation between the partial settlement and the induced tensile strains within the placed geomembrane between sand layers. They also derived Modified Elastic Model (MEM) for estimating the maximum tensile strain of geomembrane liner caused by partial settlement of base ground in waste landfill. In this model, the relation between stress and strain of geomembrane is assumed as hyperbolic. The relation between relative displacement and frictional stress is still assumed as rigid plastic. They show that the MEM presents larger maximum tensile strain for a given elongation than old Elastic Model (EM) in which relation between stress and strain is assumed as a linear.
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( Sadahiko Usami ),( Kenji Kuzumaki ),( Shigeyoshi Lmaizumi ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1
Many types of geomembrane, for example, HDPE, EPDM and TPE(PE,PP) are placed on the bottom and side slope in waste landfill for the leachate not to infiltrate into the surrounding ground. The perforated pipe to collect groundwater is also placed under the bottom liner including the geomembrane. The pipe is usually varied into the trench that is ditched in base ground and then filled with soil. In case compaction work to fill the soil is not so enough, the compression due to the weight of buried waste may occur and result in the partial settlement of the geomembrane liner spread over it. This partial settlement will surely demand the stretch of the geomembrane. Large stretch means large tensile strain, which leads to break of geomembrane. The authors conducted trapped door tests to evaluate the relation between the partial settlement and the induced tensile strains within the placed geomembrane between sand layers. They also derived Modified Elastic Model (MEM) for estimating the maximum tensile strain of geomembrane liner caused by partial settlement of base ground in waste landfill. In this model, the relation between stress and strain of geomembrane is assumed as hyperbolic. The relation between relative displacement and frictional stress is still assumed as rigid plastic. They show that the MEM presents larger maximum tensile strain for a given elongation than old Elastic Model (EM) in which relation between stress and strain is assumed as a linear.
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