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263 results on '"Sasajima Y"'

1. Differentiation between chalazion and sebaceous carcinoma by noninvasive meibography

Author

Nemoto Y, Arita R, Mizota A, and Sasajima Y

Subjects
Ophthalmology, RE1-994
Abstract

Yuji Nemoto,1 Reiko Arita,2,3 Atsushi Mizota,1 Yuko Sasajima4 1Department of Ophthalmology, Teikyo University School of Medicine, Tokyo, 2Itoh Clinic, Saitama, 3Department of Ophthalmology, The University of Tokyo, Tokyo, 4Department of Pathology, Teikyo University School of Medicine, Tokyo, Japan Background: Sebaceous carcinoma is notorious for masquerading clinically as other benign lesions such as chalazion. A tool to better differentiate between these two conditions would thus be desirable.Purpose: To examine the potential application of noninvasive meibography in the differential diagnosis of chalazion and sebaceous carcinoma of the eyelid as a retrospective cross-sectional study.Methods: Five individuals with chalazion and three patients with sebaceous carcinoma were observed. Noninvasive meibography was performed to visualize the reflectivity and shape of the lesion in each subject.Results: Noninvasive meibographic imaging revealed chalazion as a lesion of overall low reflectivity with small regions of higher reflectivity corresponding to lipid granules. On the other hand, the noninvasive meibography revealed sebaceous carcinoma as a poorly marginated lesion of high reflectivity in the eyelid.Conclusion: Noninvasive meibographic imaging may prove useful for the differential diagnosis of chalazion and sebaceous carcinoma. It may also be informative in definition of the resection area in carcinoma patients. Keywords: noninvasive meibography, sebaceous carcinoma, chalazion, eyelid

Published
2014

20. A sensitivity study of the dense shelf water formation in the Okhotsk Sea

Author

Sasajima, Y., Hasumi, H., Nakamura, T., Sasajima, Y., Hasumi, H., and Nakamura, T.

Abstract

Sensitivity of Dense Shelf Water (DSW) formation to tidal mixing around the Kuril Straits, wind stress, and river runoff in the Okhotsk Sea is examined by an ice-ocean coupled model. Horizontal resolution of the model is set to 3-8 km in the northern Okhotsk Sea for well resolving the coastal polynyas which is believed to be the principal region of DSW formation. The model shows a good performance in terms of sea ice production and the consequent DSW formation. DSW is also found to be formed in the offshore region apart from the coastal polynya. DSW is defined independently for each experiment such that it identifies the water influenced by brine. By introducing such definition the sensitivity of the DSW formation is assessed separately for change of density and that of formation rate. The density of DSW exhibits high sensitivity to all the elements considered herein, while its formation rate is sensitive only to winds. Winds affect the DSW formation rate mainly by influencing that occurs in the offshore region.

Published
2010

38. Molecular dynamics simulation of fast particle irradiation to the Gd2O3-doped CeO2.

Author

Sasajima, Y., Ajima, N., Osada, T., Ishikawa, N., and Iwase, A.

Subjects
*MOLECULAR dynamics, *PARTICLES (Nuclear physics), *CERIUM oxides, *GADOLINIUM compounds, *ATOM-atom collisions, *CRYSTAL structure, *SIMULATION methods & models
Abstract

Abstract: The structural relaxation caused by the high-energy-ion irradiation of CeO2 with Gd2O3 addition was simulated by the molecular dynamics method. The amount of Gd2O3 was changed from 0 to 25mol% by 5mol%. As the initial condition, high thermal energy was supplied to the individual atoms within a cylindrical region of nanometer-order radius located in the center of the specimen. The potential proposed by Inaba et al. was utilized to calculate interaction between atoms [H. Inaba, R. Sagawa, H. Hayashi, K. Kawamura, Solid State Ionics 122 (1999) 95–103]. The supplied thermal energy was first spent to change the crystal structure into an amorphous one within a short period of about 0.3ps, then it dissipated in the specimen. By increasing the concentration of Gd2O3, more structural disorder was observed in the sample, which is consistent to the actual experiment. [Copyright &y& Elsevier]

Published
2013
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46. Molecular dynamics simulation of fast particle irradiation on the single crystal CeO2.

Author

Sasajima, Y., Ajima, N., Osada, T., Ishikawa, N., and Iwase, A.

Subjects
*MOLECULAR dynamics, *PARTICLES (Nuclear physics), *EFFECT of radiation on metals, *SINGLE crystals, *CERIUM oxides, *NUCLEAR energy
Abstract

Abstract: We used a molecular dynamics method to simulate structural relaxation caused by the high-energy-ion irradiation of single crystal CeO2. As the initial condition, we assumed high thermal energy was supplied to the individual atoms within a cylindrical region of nanometer-order diameter located in the center of the single crystal. The potential proposed by Inaba et al. was utilized to calculate interactions between atoms [H. Inaba, R. Sagawa, H. Hayashi, K. Kawamura, Solid State Ionics 122 (1999) 95–103]. The supplied thermal energy was first spent to change the crystal structure into an amorphous one within a short period of about 0.3ps, then it was dissipated in the crystal. We compared the obtained results with those of computer simulations for UO2 and found that CeO2 was more stable than UO2 when supplied with high thermal energy. [Copyright &y& Elsevier]

Published
2013
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