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Chaos in scale-free networks of coupled oscillators
No full textIn recent years, various oscillation and synchronization phenomena have been investigated for coupled
oscillators. In star-coupled osciliators which N oscillators are coupled by one resister, N-phase synchronization phenomena can
be observed, because the current through the coupling resister should be reduced to a minim㎜. It is considered that this
coupled oscillator can be used various fields, because a variety of synchronization phenomena are exhibited . For example, it
is studied to use network which is constructed by coupIed oscillators. In this paper, we study oscillation hl coupled osciUatαs
networks with scale-free network structure.We have confirmed intermittency chaos in coupled network with ten oscillators.近年、結合発振器の様々な同期現象や振動現象がさかんに調査されている。その中で、同じ固有振
動数を持つN個の発振器を1つの抵抗に結合した星形結合系では、結合抵抗に流れる電流を最小にしようとするた
め、各発振器の電圧の位相が互いにずれて打ち消しあい、様々な同期現象がみられることが報告されてきた。それ
に伴い、このような発振器の結合系を様々な分野に応用することが考えられている。本論文では、この星形結合系
をスケールフリーネットワーク状に結合し、その結合発振器ネットワークが行う振動現象について調査する。その
結果、スケールフリーネットワーク結合された発振器ネットワークの振動現象において間欠性カオスがみられるこ
とを示す
電動糸鋸盤による鋸断技能に関する基礎研究 : 材料の送り速度が鋸断面に及ぼす影響について
No full text教師が児童/生徒に,電動糸鋸盤による鋸断作業を指導する際の基礎資料を得るため,材料送り速度
を変化させそれに伴う鋸断面の粗さを光学計測器を用いて計測した。また,材料の鋸断面粗さを各番数
の紙やすりと比較する官能検査を実施した。その結果,板材を繊維方向に直角/平行に切断する場合,
送り速度を遅くすることによって,鋸断面粗さが少なくなることが明らかになった。官能検査の結果も,
計測結果と同期することがわかった
A systematic investigation of T-stresses for a variety of center-cracked tension specimens
No full textIn this work, a systematic investigation of three-dimensional (3D) T-stresses (T 11 and T 33 ) was
conducted using detailed elastic finite element analysis (FEA). The interaction integral method was
applied to extract the T-stress solutions. Standard CCT specimens with a thickness-to-width ratio of
B/(2W) ≤ 0.0625 and a crack length-to-thickness ratio of 2a/B ≥ 8, as specified in ASTM E2472,
were considered, and the cases of B/(2W) = 0.1 ~ 1.0 and 2a/B = 0.05 ~ 7 were also added. From the
FEA results, it was found that both T 11 and T 33 at the specimen mid-plane showed significant
changes with crack lengths and specimen thicknesses for those CCT configurations that satisfy
ASTM E2472. Because both the in-plane and out-of-plane T-stresses were negative and showed
large variations for all the considered CCT specimens which was true even for the CCT specimens
complying with the ASTM E2472 standard, it was noted that these CCT specimens that complying
with the standard might show the test specimen size effect (including the crack length and specimen
thickness effect) on the fracture toughness if tested
Contact Bubble Bilayers with Flush Drainage
No full textPlanar lipid bilayers have been used to form stable bilayers into which membrane proteins are reconstituted for measurements of their function under an applied membrane potential. Recently, a lipid bilayer membrane is formed by the apposition of two monolayers that line an oil-electrolyte interface. Here, a bilayer membrane system is developed with picoliter bubbles under mechanically and chemically manipulable conditions. A water bubble lined with a phospholipid monolayer is blown from a glass pipette into an oil phase. Two blowing pipettes are manipulated, and bubbles (each with a diameter of ~ 50 μm) are held side by side to form a bilayer, which is termed a contact bubble bilayer. With the electrode implemented in the blowing pipette, currents through the bilayer are readily measured. The intra-bubble pressure is varied with the pressure-controller, leading to various sizes of the bubble and the membrane area. A rapid solution exchange system is developed by introducing additional pressure-driven injection pipettes, and the blowing pipette works as a drain. The solution is exchanged within 20 ms. Also, an asymmetric membrane with different lipid composition of each leaflet is readily formed. Example applications of this versatile method are presented to characterize the function of ion channels
Deriving position of inverse bending roll by experiment and analysis : High precision roll bending of titanium alloy wire for glasses frame
No full textIn forming of glasses frame, bending and inverse bending of rim wires with 4 rolls are usually employed. Only an inverse bending roll, the 4th roll, can change the position to control the curvature of the rim wire. A deriving method of inverse bending roll position is proposed in this study. The proposed method requires not the computational simulations but only some simple steady inverse bending experiments to obtain a relationship between inverse bending roll position and bent curvature which depends on machine condition and bent wire. The experimentally obtained relationship is used in the formulation of deriving the inverse bending roll position. To validate the proposed method, a real glasses frame shape is formed by the proposed and conventional methods. The difference between the designed and formed shapes is evaluated by a sum of absolute shape deviation. The value by the proposed method is smaller up to about 75% than that by the conventional method