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139 results on '"Urakami Y"'

1. Free Electrons Holes and Novel Surface Polar Order in Tetragonal BaTiO3 Ground States

Author

Watanabe, Y., Matsumoto, D., Urakami, Y., Masuda, A., Miyauchi, S., Kaku, S., Cheong, S. -W., Yamato, M., and Carter, E.

Subjects
Condensed Matter - Materials Science
Abstract

We find novel polar orders that yield electron (e-) and hole (h+) gas and depend on surface terminations, using density functional theory (DFT) that, unlike existing reports, relaxed all the ion positions of ATiO3 having spontaneous polarization Ps (A: alkali earth metal). By the experiments of atomic-oxygen cleaned surfaces of BaTiO3, we find both e- and h+ gas that are proven to originate from Ps and constrain electrostatic potential, which has been missing. These experiments that remarkably agree with the DFTs of defect free BaTiO3 reveal the properties of Ps-originated e-h+ and, for ferroelectric basics, an e-h+-posed intrinsic constraint on depolarization field arising from Ps in proper time ranges., Comment: Main: 16pages 4 figures Supplement 30 pages 15 figures

Published
2022

4. Effect of transition curvature and track edge fluctuation on track edge noise for narrow track recording

Author

Shiimoto, M., Katada, H., Urakami, Y., Hashimoto, M., Sugiyama, M., Nakagawa, T., Ichihara, T., and Nakamoto, K.

Subjects
Hard disks -- Design and construction, Magnetic recorders and recording -- Analysis, Noise control -- Methods, 10GB - 14.99GB hard disk drive, 15GB - 19.99GB hard disk drive, 20GB - 25GB hard disk drive, 5GB - 9.99GB hard disk drive, Hard disk drive, Over 25GB hard disk drive, Under 5GB hard disk drive, Business, Electronics, Electronics and electrical industries
Published
2010

6. Origins of Conduction at Domain Boundaries, LaAlO3/SrTiO3 and Surface for Depolarization & Size Effect

Author

Watanabe, Yukio, Matsumoto, D., Urakami, Y., Okano, M., and Masuda, A.

Subjects
electron layer, conduction, domain, ferroelectric, interface, nano, 2D electron, RRAM
Abstract

The conductions at domain boundaries due to ferroelectric polarization and LaAlO 3 /SrTiO 3 found by Ohtomo and Hwang [Nature 427, 423 (2004)] are intriguing. If these conductions are different from the conventional conductions at domain boundaries and oxide interfaces due to defects, they prove the earlier predictions [Phys. Rev. Lett. 86, 332(2001); Phys. Rev. B57, 789(1998)]. That is, when these conductions are primarily due to ferroelectric polarization as predicted, the foundations of mesoscale and nanoscale ferroelectrics should change. Considering conventional mechanisms including the high field effect as in the resistance switching (RRAM), we examine their origin and discuss these implications.

Published
2018

25. Endoscopic characteristics of low-grade gastric mucosa-associated lymphoid tissue lymphoma after eradication of Helicobacter pylori.

Author

Urakami, Y, Urakami, Yoshihito, Sano, Toshiaki, Begum, Shahnaz, Endo, Hideko, Kawamata, Hitoshi, and Oki, Yuko

Subjects
*LYMPHOMA diagnosis, *HELICOBACTER pylori
Abstract

Abstract Background and Aims: It was recently reported that low-grade gastric lymphoma of mucosa-associated lymphoid tissue (MALT) was regressed by the eradication of Helicobacter pylori. The aim of this study was to confirm the effect of H. pylori eradication on low-grade gastric MALT lymphoma and to investigate the whitish mucosa that appeared with regression of the lesions. Methods: Forty-seven H. pylori-positive patients with low-grade gastric MALT lymphoma were treated by using triple therapy. Biopsy specimens were histologically graded and B cell clonality was examined by using reverse transcription–polymerase chain reaction before and after eradication treatment. The relationship between the appearance of whitish mucosa and the degree of gastric gland loss was evaluated. Results: Histologic regression was observed 2 months after eradication therapy in 42 of 47 patients. However, B cell monoclonality changed to polyclonality in only 23 patients during the follow-up period. The appearance of whitish mucosa in patients who showed histologic regression became more frequent as the degree of gastric gland loss increased (P < 0.001). Conclusions: Most low-grade gastric MALT lymphoma histologically regressed after H. pylori eradication. The appearance of whitish mucosa after histologic regression reflected the degree of gastric gland loss. Whitish mucosa is an endoscopic characteristic and may be an endoscopic marker for regression of low-grade gastric MALT lymphoma. [ABSTRACT FROM AUTHOR]

Published
2000
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35. Duodenoscopic guided biopsy of the biliary and pancreatic duct

Author

Elster K, Urakami Y, and Seifert E

Subjects
Male, medicine.medical_specialty, Ampulla of Vater, Biliary Tract Diseases, Biopsy, Forceps, Malignancy, Diagnosis, Differential, Histological diagnosis, Pancreatic cancer, medicine, Humans, Aged, Pancreatic duct, medicine.diagnostic_test, business.industry, Gastroenterology, Pancreatic Ducts, Endoscopy, medicine.disease, Major duodenal papilla, medicine.anatomical_structure, Bile Duct Neoplasms, Female, Radiology, Bile Ducts, business, Duct (anatomy)
Abstract

First experiences with duodenoscopic guided biopsy of the biliary and the pancreatic duct on 11 cases using a special designed forceps showed that this method gave good and representative results in the biliary duct and from the papilla. However, in the present stage of development guided biopsy from the pancreatic duct does not aid exact differential diagnosis of benign or malignant lesions. In 3 out of 4 cases with pancreatic cancer the histological diagnosis was false negative. The biopsy specimens are very small and need an exact preparation and great experience of the histologist. Cytologic criteria must be relied on more here as in other areas of the GI-tract. However, the criteria of malignancy rest not in the nature of the individual cell but in the manner of proliferation, namely the infiltration of the deeper layers. This is the advantage of guided biopsy compared to cytological examination. Complications of the method may be avoided by exact guiding of the forceps and by limiting the numbers of specimens.

Published
1977

46. Fracture of the Tibial-plateau

Author

Marui, S., primary, Otani, K., additional, Ohya, K., additional, Okuda, T., additional, Urakami, Y., additional, Kurose, S., additional, and Iwakuma, T., additional

Published
1971
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50. Prognostic Value of BNP Reduction During Hospitalization in Patients With Acute Heart Failure.

Author

Kagiyama N, Kitai T, Hayashida A, Yamaguchi T, Okumura T, Kida K, Mizuno A, Oishi S, Inuzuka Y, Akiyama E, Suzuki S, Yamamoto M, Shimizu A, Urakami Y, Toki M, Aritaka S, Matsumoto K, Nagano N, Yamamoto K, and Matsue Y

Subjects
Acute Disease, Aged, Biomarkers blood, Body Weight, Female, Hospitalization statistics & numerical data, Humans, Japan epidemiology, Male, Mortality, Patient Discharge, Predictive Value of Tests, Prognosis, Registries statistics & numerical data, Risk Assessment methods, Stroke Volume, Heart Failure blood, Heart Failure diagnosis, Heart Failure mortality, Heart Failure physiopathology, Natriuretic Peptide, Brain blood
Abstract

Background: Prognostication of patients discharged after acute heart failure (AHF) hospitalization remains challenging. Body weight (BW) reduction is often used as a surrogate marker of decongestion despite the paucity of evidence. We thought to test the hypothesis that B-type natriuretic peptide (BNP) reduction during hospitalization has independent prognostic value in AHF., Methods and Results: We studied the prognostic predictability of percentage BNP reduction achieved during hospitalization in patients from the REALITY-AHF study. Percentage BNP reduction was defined as (BNP on admission - BNP at discharge) / BNP on admission × 100. The primary endpoint was 1-year all-cause death. In 1028 patients (age, 77 ± 13 years; 57% male; left ventricular ejection fraction, 47 ± 16%) with AHF, median BNP level at admission was 747 ng/L (interquartile range, 439-1367 ng/L) and median percentage BNP reduction was 62.5% (interquartile range, 36.5-78.5%). The smallest percentage BNP reduction quartile had more than 2-fold higher risk of all-cause death than the greatest quartile (23.0% vs 9.7%, P< .001). After adjusting for covariates including BNP at discharge, the percentage BNP reduction was significantly associated with all-cause death (hazard ratio 0.96, 95% confidence interval 0.93-0.99, P= .032), whereas percentage BW reduction was not. Percentage BNP reduction was more predictive in patients with heart failure with reduced ejection fraction than in those with preserved ejection fraction., Conclusions: The prognostic value of percentage BNP reduction during hospitalization was superior to that of percentage BW reduction and was independent of other risk markers, including BNP at discharge., (Copyright © 2019 Elsevier Inc. All rights reserved.)

Published
2019
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