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Search Results: 1 - 10 of 1070 matches for " Toru Hyakutake "
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Behavior of Motile Sperm in Taylor-Couette Flow: Effect of Shear Stress on the Behavior of Motile Sperm  [PDF]
Yasutaka Hayamizu, Toru Hyakutake, Koji Matsuura, Shinichiro Yanase, Shinichi Morita, Shigeru Ohtsuka, Takeshi Gonda
Open Journal of Fluid Dynamics (OJFD) , 2013, DOI: 10.4236/ojfd.2013.32A002

Infertility is often cited as one of the causes of a declining birthrate, which has become a serious social problem in recent years. Processes by which motile sperm can be safely and easily sorted are therefore important for infertility treatment. Therefore, as a new sorting method, microfluidic sperm sorter using the microfluidic system has been developed. To improve more separation efficiency of this device, it is necessary to know the behaviors of motile sperm in the microchannel where the sperm undergo shear flow. The previous study implied the necessity of the modeling of motile sperm in the shear flow. In the present study, therefore, we experimentally investigated the behavior of the motile sperm in the Taylor-Couette flow using PTV (Particle Tracking Velocimetry) method. The experimental results showed that the ascent of the shear stress led to the increase in the sperm velocity, and the direction of the sperm velocity was opposite to that of the flow.

Notes on the Construction of the D2-brane from Multiple D0-branes
Yoshifumi Hyakutake
Physics , 2003, DOI: 10.1016/j.nuclphysb.2003.09.056
Abstract: We investigate the correspondence between the D2-brane, which is described by the abelian Born-Infeld action, and multiple D0-branes, which are done by the nonabelian Born-Infeld action. We construct effective actions for the fuzzy cylinder, sphere and plane formed via D0-branes and compare these actions with those for the cylindrical, spherical and planar D2-brane. We show that in the continuous limit, the effective actions for the fuzzy D0-branes precisely coincide with those for the single D2-brane if both the fuzziness of the D0-brane and the area occupied per a unit of magnetic flux on the D2-brane are equal to $(2\pi\ell_s)^2$.
Torus-like Dielectric D2-brane
Yoshifumi Hyakutake
Physics , 2001, DOI: 10.1088/1126-6708/2001/05/013
Abstract: We find new solutions corresponding to torus-like generalization of dielectric D2-brane from the viewpoint of D2-brane action and N D0-branes one. These are meta-stable and would decay to the spherical dielectric D2-brane.
Expanded Strings in the Background of NS5-branes via a M2-brane, a D2-brane and D0-branes
Yoshifumi Hyakutake
Physics , 2001, DOI: 10.1088/1126-6708/2002/01/021
Abstract: Classical configurations of a M2-brane, a D2-brane and D0-branes are investigated in the background of an infinite array of M5-branes or NS5-branes. On the M2-brane, we discuss three kinds of configurations, such as a sphere, a cylinder and a torus-like one. These are stabilized by virtue of the background fluxes of M5-branes. The torus-like M2-brane configuration has winding and momentum numbers of 11th direction, and in terms of the type IIA superstring theory, this corresponds to a torus-like D2-brane with electric and magnetic fluxes on it. We also reproduce the same configuration from a non-abelian Born-Infeld action for D0-branes. It will be a construction of closed strings from D0-branes. An electric flux quantization condition on the D2-brane is also discussed in terms of D0-branes.
Fuzzy BIon
Yoshifumi Hyakutake
Physics , 2003, DOI: 10.1103/PhysRevD.68.046003
Abstract: We construct a solution of the BFSS matrix theory, which is a counterpart of the BIon solution representing a fundamental string ending on a bound state of a D2-brane and D0-branes. We call this solution the `fuzzy BIon' and show that this configuration preserves 1/4 supersymmetry of type IIA superstring theory. We also construct an effective action for the fuzzy BIon by analyzing the nonabelian Born-Infeld action for D0-branes. When we take the continuous limit, with some conditions, this action coincides with the effective action for the BIon configuration.
Supertubes and Supercurves from M-Ribbons
Yoshifumi Hyakutake,Nobuyoshi Ohta
Physics , 2002, DOI: 10.1016/S0370-2693(02)02066-X
Abstract: We construct 1/4 BPS configurations, `M-ribbons', in M-theory on T^2, which give the supertubes and supercurves in type IIA theory upon dimensional reduction. These M-ribbons are generalized so as to be consistent with the SL(2,Z) modular transformation on T^2. In terms of the type IIB theory, the generalized M-ribbons are interpreted as an SL(2,Z) duality family of super D-helix. It is also shown that the BPS M-ribbons must be straight in one direction.
Re-expansion pulmonary edema in a boy with spontaneous pneumothorax during an influenza B virus infection  [PDF]
Toru Watanabe
Open Journal of Pediatrics (OJPed) , 2012, DOI: 10.4236/ojped.2012.24042
Abstract: Re-expansion Pulmonary Edema (RPE) is an uncommon complication following rapid re-expansion of the lungs, and the most common disorder associated with RPE is spontaneous pneumothorax. The majority of patients with RPE associated with pneumothorax have been adults; only 4 cases have been reported in children. We present a patient who developed RPE after treatment of spontaneous pneumothorax that occurred during an influenza B virus infection. His condition improved only with oxygen supplementation and intravenous corticosteroids. Infection with influenza B virus leads to increased production of lung epithelial oxidants, which might have contributed to the development of RPE in our patient.
Treatment Strategy for Recurrent Multiple Hepatocellular Carcinoma  [PDF]
Toru Ishikawa
Journal of Cancer Therapy (JCT) , 2013, DOI: 10.4236/jct.2013.42A049

Hepatocellular carcinoma (HCC) has some unique characteristics in the digestive organ cancer. Therefore it is very important to select an appropriate treatment for recurrent HCC according to several situations such as the type of recurrence, previous treatments and conditions of patient. This article is a review of the concept of recurrent multiple HCC and its therapeutic strategies.

Tachyon Condensation and Graviton Production in Matrix Theory
H. Awata,S. Hirano,Y. Hyakutake
Physics , 1999,
Abstract: We study a membrane -- anti-membrane system in Matrix theory. It in fact exhibits the tachyon instability. By suitably representing this configuration, we obtain a (2+1)-dimensional U(2) gauge theory with a 't Hooft's twisted boundary condition. We identify the tachyon field with a certain off-diagonal element of the gauge fields in this model. Taking into account the boundary conditions carefully, we can find vortex solutions which saturate the Bogomol'nyi-type bound and manifest the tachyon condensation. We show that they can be interpreted as gravitons in Matrix theory.
Orientifold Planes, Type I Wilson Lines and Non-BPS D-branes
Yoshifumi Hyakutake,Yosuke Imamura,Shigeki Sugimoto
Physics , 2000, DOI: 10.1088/1126-6708/2000/08/043
Abstract: There is a longstanding puzzle concerned with the existence of Op~-planes with p>=6, which are orientifold p-planes of negative charge with stuck Dp-branes. We study the consistency of configurations with various orientifold planes and propose a resolution to this puzzle. It is argued that O6~-planes are possible in massive IIA theory with odd cosmological constant, while O7~-planes and O8~-planes are not allowed. Various relations between orientifold planes and non-BPS D-branes are also addressed.
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