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300 results on '"Egashira M"'

1. Phase Transition of Extrinsic Curvature Surface Model on a Disk

Author

Endo, T., Egashira, M., Obata, S., and Koibuchi, H.

Subjects
Condensed Matter - Statistical Mechanics, Condensed Matter - Soft Condensed Matter
Abstract

An extrinsic curvature surface model is investigated by Monte Carlo simulations on a disk. We found that the model undergoes a first-order transition separating the smooth phase from the collapsed phase. The results in this paper together with the previous ones suggest that the order of the transition is independent of whether the surface is compact (closed) or non-compact (open)., Comment: 10 pages with 7 figures

Published
2006

2. Phase transition of triangulated spherical surfaces supported by elastic chains with rigid junctions

Author

Endo, T., Egashira, M., Obata, S., and Koibuchi, H.

Subjects
Condensed Matter - Statistical Mechanics, Condensed Matter - Soft Condensed Matter
Abstract

A surface model with skeletons is investigated by using the canonical Monte Carlo simulations. The skeleton is composed of linear chains, which are joined to each other at the rigid junctions. A one-dimensional bending energy is defined on the linear chains, and no two-dimensional curvature energy is assumed on the surface. The model undergoes a first-order transition between the smooth phase and the crumpled phase. We conclude that the first-order transition of the surface model with skeletons is independent of whether the junctions are elastic or rigid., Comment: 17 pages with 9 figures

Published
2006

3. Phase transitions of an intrinsic curvature model on dynamically triangulated spherical surfaces with point boundaries

Author

Obata, S., Egashira, M., Endo, T., and Koibuchi, H.

Subjects
Condensed Matter - Statistical Mechanics, Condensed Matter - Soft Condensed Matter
Abstract

An intrinsic curvature model is investigated using the canonical Monte Carlo simulations on dynamically triangulated spherical surfaces of size upto N=4842 with two fixed-vertices separated by the distance 2L. We found a first-order transition at finite curvature coefficient \alpha, and moreover that the order of the transition remains unchanged even when L is enlarged such that the surfaces become sufficiently oblong. This is in sharp contrast to the known results of the same model on tethered surfaces, where the transition weakens to a second-order one as L is increased. The phase transition of the model in this paper separates the smooth phase from the crumpled phase. The surfaces become string-like between two point-boundaries in the crumpled phase. On the contrary, we can see a spherical lump on the oblong surfaces in the smooth phase. The string tension was calculated and was found to have a jump at the transition point. The value of \sigma is independent of L in the smooth phase, while it increases with increasing L in the crumpled phase. This behavior of \sigma is consistent with the observed scaling relation \sigma \sim (2L/N)^\nu, where \nu\simeq 0 in the smooth phase, and \nu=0.93\pm 0.14 in the crumpled phase. We should note that a possibility of a continuous transition is not completely eliminated., Comment: 15 pages with 10 figures

Published
2006
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29. [A case report of dural sinus thrombosis: direct thrombolytic therapy using endovascular surgery]

Author

Takami T, Suzuki T, Tokuno H, Egashira M, Tsuyuguchi N, masaki komiyama, and Hakuba A

Subjects
Adult, Sinus Thrombosis, Intracranial, Humans, Female, Thrombolytic Therapy, Dura Mater, Cranial Sinuses, Infusions, Intravenous, Combined Modality Therapy, Urokinase-Type Plasminogen Activator
Abstract

Dural sinus thrombosis, a relatively rare disease, is difficult to diagnose because of variable symptomatic manifestations. We successfully treated a case of dural sinus thrombosis by direct thrombolysis using an endovascular technique in combination with postoperative anticoagulant therapy. The patient, a 19-year-old female, developed a headache affecting her whole head on December 13, 1993. She was admitted to our hospital the next day. Neurological examination upon admission revealed no neurological abnormalities, nor was there any abnormality in CT scan, either plain or enhanced, taken on the day of admission. The patient's consciousness deteriorated in the early morning of December 22. MRI and cerebral angiography revealed thrombi from the confluence of the sinuses to the right transverse and sigmoid sinus, with disturbed circulation through deep cerebral veins. Systemic thrombolytics, steroid and mannitol were started, but, on the next day, the third ventricle was compressed by bilateral swelling of the basal ganglia, with hydrocephalus. Since her consciousness deteriorated further despite ventricular drainage and barbiturate therapy, direct thrombolytic therapy was performed on December 25. A catheter was placed in the superior sagittal sinus, and 600,000 units of urokinase was locally injected, followed by postoperative anticoagulant therapy. The patient's condition improved rapidly. On CT scan, the bilateral swelling of the basal ganglia disappeared along with the hydrocephalus. At about 1 month after endovascular surgery, MRI and cerebral angiography revealed recanalization of the deep cerebral veins, straight sinus and confluence of sinuses with improved opacification of the left transverse sinus, although the right transverse sinus was found to be re-occluded.(ABSTRACT TRUNCATED AT 250 WORDS)

Published
1995

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