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Search Results: 1 - 10 of 139259 matches for " Sugiyama K "
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Quantum probability from a geometrical interpretation of a wave function
K. Sugiyama
Physics , 1999,
Abstract: The probabilistic prediction of quantum theory is mystery. I solved the mystery by a geometrical interpretation of a wave function. This suggests the unification between quantum theory and the theory of relativity. This suggests Many-Worlds Interpretation is true, too.
Volumetric formulation of lattice Boltzmann models with energy conservation
M. Sbragaglia,K. Sugiyama
Physics , 2010, DOI: 10.1103/PhysRevE.82.046709
Abstract: We analyze a volumetric formulation of lattice Boltzmann for compressible thermal fluid flows. The velocity set is chosen with the desired accuracy, based on the Gauss-Hermite quadrature procedure, and tested against controlled problems in bounded and unbounded fluids. The method allows the simulation of thermohydrodyamical problems without the need to preserve the exact space-filling nature of the velocity set, but still ensuring the exact conservation laws for density, momentum and energy. Issues related to boundary condition problems and improvements based on grid refinement are also investigated.
Linear shear flow past a hemispherical droplet adhering to a solid surface
K. Sugiyama,M. Sbragaglia
Physics , 2007,
Abstract: This paper investigates the properties of a three dimensional shear flow overpassing a hemispherical droplet resting on a plane wall. The exact solution is computed as a function of the viscosity ratio between the droplet and the surrounding fluid and generalizes the solution for the hemispherical no-slip bump given in an earlier paper by Price (1985). Several expressions including the torque and the force acting on the drop will be considered as well as the importance of the deformations on the surface for small Capillary numbers.
Boundary induced non linearities at small Reynolds Numbers
M. Sbragaglia,K. Sugiyama
Physics , 2006, DOI: 10.1016/j.physd.2007.03.004
Abstract: We investigate the influence of boundary slip velocity in Newtonian fluids at finite Reynolds numbers. Numerical simulations with Lattice Boltzmann method (LBM) and Finite Differences method (FDM) are performed to quantify the effect of heterogeneous boundary conditions on the integral and local properties of the flow. Non linear effects are induced by the non homogeneity of the boundary condition and change the symmetry properties of the flow inducing an overall mean flow reduction. To explain the observed drag modification, reciprocal relations for stationary ensembles are used, predicting a reduction of the mean flow rate from the creeping flow to be proportional to the fourth power of the friction Reynolds number. Both numerical schemes are then validated within the theoretical predictions and reveal a pronounced numerical efficiency of the LBM with respect to FDM.
A sliding technique to load thin endothelial donor lamella onto Busin glide for Descemet-stripping automated endothelial keratoplasty
Kobayashi A, Yokogawa H, Sugiyama K
Clinical Ophthalmology , 2012, DOI: http://dx.doi.org/10.2147/OPTH.S34197
Abstract: sliding technique to load thin endothelial donor lamella onto Busin glide for Descemet-stripping automated endothelial keratoplasty Methodology (1314) Total Article Views Authors: Kobayashi A, Yokogawa H, Sugiyama K Published Date August 2012 Volume 2012:6 Pages 1229 - 1231 DOI: http://dx.doi.org/10.2147/OPTH.S34197 Received: 24 May 2012 Accepted: 21 June 2012 Published: 02 August 2012 Akira Kobayashi, Hideaki Yokogawa, Kazuhisa Sugiyama Department of Ophthalmology, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan Abstract: We describe a modified technique for loading donor corneal endothelial lamella onto a Busin glide without causing wrinkles, as part of the procedure of Descemet-stripping automated endothelial keratoplasty. Briefly, after punching out a composite of the donor-endothelial lamella and a microkeratome-dissected cap, several drops of dispersive ophthalmic viscosurgical device are placed onto the endothelial surface. The Busin glide surface is then wetted with several drops of balanced salt solution. After the composite is transferred onto the Busin glide, hydrodissection of the potential space between the donor-endothelial lamella and the microkeratome-dissected cap is carefully performed to enable smooth detachment of these two lamellae. Whereas simply dragging the donor-endothelial lamella directly onto the glide can cause wrinkling or folding of the donor lamella, this technique enables smooth detachment of the composite without wrinkle or fold formation, and results in less endothelial cell damage.
Localized vitreous adhesion to the retina after ocular contusion with a baseball
Kimura M, Nishimura A, Sugiyama K
Clinical Ophthalmology , 2012, DOI: http://dx.doi.org/10.2147/OPTH.S30068
Abstract: calized vitreous adhesion to the retina after ocular contusion with a baseball Case Series (1945) Total Article Views Authors: Kimura M, Nishimura A, Sugiyama K Published Date June 2012 Volume 2012:6 Pages 879 - 884 DOI: http://dx.doi.org/10.2147/OPTH.S30068 Received: 19 January 2012 Accepted: 03 February 2012 Published: 08 June 2012 Masayo Kimura, Akira Nishimura, Kazuhisa Sugiyama Department of Ophthalmology and Visual Science, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan Purpose: To report a series of five cases of vitreous adhesions after blunt trauma caused by a baseball strike. Methods: The medical records of patients with ocular contusion after being struck by a baseball, who had undergone pars plana vitrectomy, were reviewed. An aqueous suspension of triamcinolone acetonide was used intraoperatively to facilitate visualization of the vitreous. Results: Five eyes were reviewed in this study. There were two cases of retinal detachment, two cases of traumatic macular hole, and one case of retinal detachment due to traumatic macular hole. Despite the surgical creation of posterior vitreous detachment, if not already present, the thin layer of localized vitreous adhesion to the retinal necrotic area with/without retinal hole was found between the major vascular arcades and the equator in all cases. The thin layer of the vitreous was removed with a vitreous cutter and diamond-dusted membrane scraper, but complete removal was impossible. Conclusions: A thin layer of localized vitreous adhesion at the area of retinal degeneration was observed in eyes following ocular contusion.
In vivo laser confocal microscopy findings in patients with map-dot-fingerprint (epithelial basement membrane) dystrophy
Kobayashi A, Yokogawa H, Sugiyama K
Clinical Ophthalmology , 2012, DOI: http://dx.doi.org/10.2147/OPTH.S34196
Abstract: vivo laser confocal microscopy findings in patients with map-dot-fingerprint (epithelial basement membrane) dystrophy Case Series (1491) Total Article Views Authors: Kobayashi A, Yokogawa H, Sugiyama K Published Date July 2012 Volume 2012:6 Pages 1187 - 1190 DOI: http://dx.doi.org/10.2147/OPTH.S34196 Received: 24 May 2012 Accepted: 12 June 2012 Published: 27 July 2012 Akira Kobayashi, Hideaki Yokogawa, Kazuhisa Sugiyama Department of Ophthalmology, Kanazawa University Graduate School of Medical Science, Kanazawa, Japan Background: The purpose of this study was to investigate pathological changes of the corneal cell layer in patients with map-dot-fingerprint (epithelial basement membrane) dystrophy by in vivo laser corneal confocal microscopy. Methods: Two patients were evaluated using a cornea-specific in vivo laser scanning confocal microscope (Heidelberg Retina Tomograph 2 Rostock Cornea Module, HRT 2-RCM). The affected corneal areas of both patients were examined. Image analysis was performed to identify corneal epithelial and stromal deposits correlated with this dystrophy. Results: Variously shaped (linear, multilaminar, curvilinear, ring-shape, geographic) highly reflective materials were observed in the “map” area, mainly in the basal epithelial cell layer. In “fingerprint” lesions, multiple linear and curvilinear hyporeflective lines were observed. Additionally, in the affected corneas, infiltration of possible Langerhans cells and other inflammatory cells was observed as highly reflective Langerhans cell-like or dot images. Finally, needle-shaped materials were observed in one patient. Conclusion: HRT 2-RCM laser confocal microscopy is capable of identifying corneal microstructural changes related to map-dot-fingerprint corneal dystrophy in vivo. The technique may be useful in elucidating the pathogenesis and natural course of map-dot-fingerprint corneal dystrophy and other similar basement membrane abnormalities.
A sliding technique to load thin endothelial donor lamella onto Busin glide for Descemet-stripping automated endothelial keratoplasty
Kobayashi A,Yokogawa H,Sugiyama K
Clinical Ophthalmology , 2012,
Abstract: Akira Kobayashi, Hideaki Yokogawa, Kazuhisa SugiyamaDepartment of Ophthalmology, Kanazawa University Graduate School of Medical Science, Kanazawa, JapanAbstract: We describe a modified technique for loading donor corneal endothelial lamella onto a Busin glide without causing wrinkles, as part of the procedure of Descemet-stripping automated endothelial keratoplasty. Briefly, after punching out a composite of the donor-endothelial lamella and a microkeratome-dissected cap, several drops of dispersive ophthalmic viscosurgical device are placed onto the endothelial surface. The Busin glide surface is then wetted with several drops of balanced salt solution. After the composite is transferred onto the Busin glide, hydrodissection of the potential space between the donor-endothelial lamella and the microkeratome-dissected cap is carefully performed to enable smooth detachment of these two lamellae. Whereas simply dragging the donor-endothelial lamella directly onto the glide can cause wrinkling or folding of the donor lamella, this technique enables smooth detachment of the composite without wrinkle or fold formation, and results in less endothelial cell damage.Keywords: DSAEK, Busin glide, endothelial keratoplasty
Localized vitreous adhesion to the retina after ocular contusion with a baseball
Kimura M,Nishimura A,Sugiyama K
Clinical Ophthalmology , 2012,
Abstract: Masayo Kimura, Akira Nishimura, Kazuhisa SugiyamaDepartment of Ophthalmology and Visual Science, Kanazawa University Graduate School of Medical Science, Kanazawa, JapanPurpose: To report a series of five cases of vitreous adhesions after blunt trauma caused by a baseball strike.Methods: The medical records of patients with ocular contusion after being struck by a baseball, who had undergone pars plana vitrectomy, were reviewed. An aqueous suspension of triamcinolone acetonide was used intraoperatively to facilitate visualization of the vitreous.Results: Five eyes were reviewed in this study. There were two cases of retinal detachment, two cases of traumatic macular hole, and one case of retinal detachment due to traumatic macular hole. Despite the surgical creation of posterior vitreous detachment, if not already present, the thin layer of localized vitreous adhesion to the retinal necrotic area with/without retinal hole was found between the major vascular arcades and the equator in all cases. The thin layer of the vitreous was removed with a vitreous cutter and diamond-dusted membrane scraper, but complete removal was impossible.Conclusions: A thin layer of localized vitreous adhesion at the area of retinal degeneration was observed in eyes following ocular contusion.Keywords: localized, vitreous adhesion, triamcinolone acetonide, ocular contusion, pars plana vitrectomy
In vivo laser confocal microscopy findings in patients with map-dot-fingerprint (epithelial basement membrane) dystrophy
Kobayashi A,Yokogawa H,Sugiyama K
Clinical Ophthalmology , 2012,
Abstract: Akira Kobayashi, Hideaki Yokogawa, Kazuhisa SugiyamaDepartment of Ophthalmology, Kanazawa University Graduate School of Medical Science, Kanazawa, JapanBackground: The purpose of this study was to investigate pathological changes of the corneal cell layer in patients with map-dot-fingerprint (epithelial basement membrane) dystrophy by in vivo laser corneal confocal microscopy.Methods: Two patients were evaluated using a cornea-specific in vivo laser scanning confocal microscope (Heidelberg Retina Tomograph 2 Rostock Cornea Module, HRT 2-RCM). The affected corneal areas of both patients were examined. Image analysis was performed to identify corneal epithelial and stromal deposits correlated with this dystrophy.Results: Variously shaped (linear, multilaminar, curvilinear, ring-shape, geographic) highly reflective materials were observed in the “map” area, mainly in the basal epithelial cell layer. In “fingerprint” lesions, multiple linear and curvilinear hyporeflective lines were observed. Additionally, in the affected corneas, infiltration of possible Langerhans cells and other inflammatory cells was observed as highly reflective Langerhans cell-like or dot images. Finally, needle-shaped materials were observed in one patient.Conclusion: HRT 2-RCM laser confocal microscopy is capable of identifying corneal microstructural changes related to map-dot-fingerprint corneal dystrophy in vivo. The technique may be useful in elucidating the pathogenesis and natural course of map-dot-fingerprint corneal dystrophy and other similar basement membrane abnormalities.Keywords: cornea, confocal microscopy, map-dot-fingerprint dystrophy, epithelial basement membrane dystrophy, Heidelberg Retina Tomograph 2 Rostock Cornea Module (HRT 2-RCM)
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