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34 results on '"Fujita, Nobuhiko"'

8. Ceramic coating for valve seats and stems by plasma chemical vapor deposition

Author

T. Igarashi, Fujita Nobuhiko, Takashi Yoshioka, H. Ukegawa, and Hiromu Kawai

Subjects
Materials science, Metallurgy, chemistry.chemical_element, Surfaces and Interfaces, General Chemistry, Chemical vapor deposition, Substrate (electronics), Condensed Matter Physics, Surfaces, Coatings and Films, Corrosion, Autoclave, chemistry, Stellite, Materials Chemistry, Water environment, Tin, Cobalt
Abstract

To extend the lifetime of the valve seats and stems used in nuclear power plants, we have developed a unique ceramic coating technique using plasma chemical vapor deposition (CVD). Multilayer coatings of Al 2 O 3 /TiN/TiC, Al 2 O 3 /TiC and TiN/TiC were deposited onto Stellite and stainless steel substrates. The mechanical and physical properties of the coatings were evaluated by various methods. The coated specimens showed good wear resistance in a high-temperature water environment. Corrosion resistance was evaluated in an autoclave at a temperature of 548 K for 200 h. The coated specimens showed excellent performance in reducing the cobalt level dissolved in the testing solution. The weight loss of the multilayer-coated AISI403 specimen, as evaluated by a cavitation erosion test, was less than 1% of that of the uncoated AISI403. However, for the coated Stellite-padded AISI316L substrate, the weight loss was almost the same as that of the uncoated specimen.

Published
1991

9. Abstract 1785: Renal Artery Angioplasty Improves Diastolic Cardiac Function In Patients With heart failure Possessing Renal Artery Stenosis.

Author

Yamamoto, Eisei, primary, Takano, Hitoshi, additional, Tajima, Hiroyuki, additional, Tanabe, Jun, additional, Kawanaka, Hidekazu, additional, Tara, Shuhei, additional, Takahashi, Yasuhiro, additional, Fujita, Nobuhiko, additional, Takagi, Gen, additional, Aoki, Satoshi, additional, Asai, Kuniya, additional, Yasutake, Masahiro, additional, Takayama, Morimasa, additional, and Mizuno, Kyoichi, additional

Published
2007
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10. Coronary Perforation During Percutaneous Coronary Intervention Lessons From Our Experiences

Author

Shirakabe, Akihiro, primary, Takano, Hitoshi, additional, Nakamura, Shunichi, additional, Kikuchi, Arifumi, additional, Sasaki, Asako, additional, Yamamoto, Eisei, additional, Kawashima, Shuji, additional, Takagi, Gen, additional, Fujita, Nobuhiko, additional, Aoki, Satoshi, additional, Asai, Kuniya, additional, Yoshikawa, Masatomo, additional, Kato, Koji, additional, Yamamoto, Takeshi, additional, Takayama, Morimasa, additional, and Takano, Teruo, additional

Published
2007
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15. Impact of the Revised Criteria for Acute Myocardial Infarction Using Cardiac Troponins in a Japanese Population With Acute Coronary Syndromes

Author

Yamamoto, Takeshi, primary, Yasutake, Masahiro, additional, Takagi, Hiromichi, additional, Akutsu, Koichi, additional, Fujita, Nobuhiko, additional, Kasagami, Yasuhira, additional, Sato, Naoki, additional, Nakagomi, Akihiro, additional, Kusama, Yoshiki, additional, Takayama, Morimasa, additional, Tanaka, Keiji, additional, and Takano, Teruo, additional

Published
2005
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17. Elevated plasma levels of C-reactive protein may modulate myocardial damage in patients with acute myocardial infarction underwent successful percutaneous coronary intervention

Author

Nakagomi, Akihiro, primary, Akutu, Kouichi, additional, Aoki, Satoshi, additional, Yamane, Yoshito, additional, Takagi, Hiromichi, additional, Fujita, Nobuhiko, additional, Takano, Hitoshi, additional, Kusama, Yoshiki, additional, Takayama, Morimasa, additional, and Takano, Teruo, additional

Published
2002
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26. Amorphous-Si1−xSnx:H by sputter assisted plasma CVD

Author

Fujita Nobuhiko, Hajime Hitotsuyanagi, T Igarashi, and H Itozaki

Subjects
Glow discharge, Auger electron spectroscopy, Materials science, Band gap, Analytical chemistry, chemistry.chemical_element, Plasma, Condensed Matter Physics, Silane, Electronic, Optical and Magnetic Materials, Amorphous solid, chemistry.chemical_compound, chemistry, Sputtering, Materials Chemistry, Ceramics and Composites, Tin
Abstract

Amorphous Si1−xSnx:H films were deposited by Sputter Assisted Plasma CVD (SAP-CVD) which used glow discharge to decompose silane gas and to sputter a solid tin target simultaneously. Resulting films contain tin as 0

Published
1983

28. Properties of a-SiGe and Application to Stacked Solar Cell

Author

Fujita Nobuhiko and H. Itozaki

Subjects
Glow discharge, Materials science, business.industry, Energy conversion efficiency, Hybrid solar cell, Substrate (electronics), Buffer (optical fiber), law.invention, law, Solar cell, Optoelectronics, business, Layer (electronics), Deposition (law)
Abstract

Deposition technique of a-SiGe:H and its application to a stacked solar sell were investigated. Properties of a-SiGe:H were improved by a glow discharge method with a negatively biased substrate, and a mercury sensitized photo CVD under lower pressure. An a-SiGe:H single junction solar cell was improved by slight boron doping to an i layer and insertion of a buffer layer into a p/i interface. A conversion efficiency of more than 10 % was obtained by a triple stacked solar cell on a alass substrate.

Published
1987

29. Amorphous Silicon—Germanium Deposited by Photo—CVD

Author

H. Itozaki, Fujita Nobuhiko, and H. Hitotsuyanagi

Subjects
Materials science, Hydrogen, Band gap, Energy conversion efficiency, Analytical chemistry, Infrared spectroscopy, chemistry.chemical_element, Chemical vapor deposition, Microstructure, law.invention, chemistry, Transmission electron microscopy, law, Solar cell
Abstract

Hydrogenated amorphous silicon germanium (a—SiGe:H) films were deposited by photo—chemical vapor deposition (Photo—CVD) of SiH4 and GeH4 with mercury sensitizer. Their band gap was controlled from 0.9 eV to 1.9 eV by changing the gas ratio of SiH4 and GeH4. High quality opto—electrical properties have been obtained for thea—SiGe:H films by Photo—CVD. Hydrogen termination and microstructure of a-SiGe:H were investigated by infrared absorption and transmission electron microscopy. Ana—Si:H solar cell and an a—Si:H/a—SiGe:H stacked solar cell were made, each of which has conversion efficiency 5.3% and 5.1%, respectively.

Published
1985

32. B-type natriuretic peptide as an integrated risk marker in non-ST elevation acute coronary syndromes.

Author

Yamamoto T, Sato N, Yasutake M, Takagi H, Morita N, Akutsu K, Fujii M, Fujita N, Tanaka K, and Takano T

Subjects
Aged, Biomarkers blood, Coronary Artery Bypass, Coronary Disease classification, Coronary Disease mortality, Coronary Disease physiopathology, Female, Hospital Mortality, Humans, Male, Middle Aged, Myocardial Infarction blood, Myocardial Infarction mortality, Myocardial Infarction physiopathology, Myocardial Infarction surgery, Prognosis, Survival Analysis, Coronary Disease blood, Natriuretic Peptide, Brain blood
Abstract

Background: Elevated B-type natriuretic peptide (BNP) levels show prognostic significance in patients with non-ST elevation acute coronary syndromes, but the underlying pathophysiology remains unclear., Methods: Two hundred and eighteen consecutive patients with non-ST elevation acute coronary syndromes were studied retrospectively. We compared clinical characteristics between groups with plasma BNP levels above or below the median value, and performed multiple logistic regression analysis to identify independent predictors of supramedian BNP levels., Results: Patients with supramedian BNP (>or=134 pg/ml) were more likely to be elderly (>or=75 years) with diabetes, prior myocardial infarction, and a history of coronary artery bypass grafting. They also had higher cardiac marker levels, a higher Killip class, a lower left ventricular ejection fraction, renal insufficiency (creatinine>or=1.5 mg/dl), and more 3-vessel disease. In multivariate analysis, the strongest independent predictor of supramedian BNP levels was 3-vessel disease (chi(2)=12.1), followed by old age (chi(2)=10.3), renal insufficiency (chi(2)=5.0), higher Killip class (chi(2)=4.2), and lower left ventricular ejection fraction (chi(2)=4.1). All 11 patients dying in hospital had supramedian BNP levels. Its elevation reflected the risk of 3-vessel disease and coronary artery bypass grafting regardless of troponin status., Conclusion: In unselected patients with non-ST elevation acute coronary syndromes, an increase of BNP is correlated with the extent of myocardial ischemia, age, renal insufficiency, and ventricular dysfunction. It may be a useful biomarker integrating conventional risk factors for risk stratification in this population.

Published
2006
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33. [Multi-biomarker approach to acute coronary syndrome].

Author

Seino Y, Ogawa A, Yamashita T, Fujita N, and Ogata K

Subjects
Angina, Unstable etiology, Biomarkers blood, CD40 Ligand blood, Creatine Kinase, MB Form blood, Fatty Acid Binding Protein 3, Fatty Acid-Binding Proteins blood, Humans, Myocardial Infarction etiology, Myoglobin blood, Natriuretic Peptide, Brain blood, Syndrome, Troponin T blood, Angina, Unstable diagnosis, Myocardial Infarction diagnosis
Abstract

High-risk acute coronary syndrome is characterized by vulnerable-plaque with subocclusive thrombus and down-stream microemboli spreading minor myocardial damage, resulting in non-ST-elevation myocardial infarction. Advances in the understanding of the pathogenesis and consequences of acute coronary syndrome have stimulated development of novel biomarkers, and expanded their role in the different spectrum of the underlying pathophysiology, namely multi-biomarker strategy; consisted of biomarkers for 1) myocardial necrosis(membrane damage to myofibril necrosis), 2) plaque destabilization, 3) myocardial stress(ischemic stress per se and end-diastolic atrial or ventricular wall stress), 4) myocardial ischemia, and 5) inflammatory process. In this article, we review clinical importance of novel biomarkers referring our previous clinical investigation and other reports, especially troponin T for detection of minor myocardial damage associated with vulnerable plaque with thrombus/embolus, heart-type fatty acid -binding protein for earlier detection of myocardial damage and it's role for the rule-out triage, N-terminal pro-BNP for earlier risk stratification in cardiac emergency, and soluble CD40 ligand for earlier identification of plaque destabilization with platelet activation in non-ST-elevation acute coronary syndrome.

Published
2006

34. Initial experiences of removal of intra-aortic balloon pumps with the Angio-Seal.

Author

Kato K, Sato N, Yamamoto T, Fujita N, Miyagi Y, Tanaka K, and Takano T

Subjects
Adult, Aged, Aged, 80 and over, Collagen, Female, Humans, Male, Middle Aged, Time Factors, Treatment Outcome, Device Removal methods, Hemostatic Techniques instrumentation, Intra-Aortic Balloon Pumping instrumentation
Abstract

Angio-Seal, a vascular hemostasis device, has been shown to be safe and effective in rapidly achieving hemostasis after cardiac catheterization or coronary intervention. We propose that similar results can be obtained with Angio-Seal when removing an intra-aortic balloon pump (IABP). We studied 16 patients in whom Angio-Seal was utilized in IABP removals. The primary safety endpoint was a composite of major complications such as retroperitoneal bleeding, vessel occlusion, loss of distal pulses, vascular surgery or death, and minor complications such as hematoma (> 10 cm), AV fistula or pseudoaneurysm by 7 days after removal. The time-to-hemostasis was 2-5 minutes (mean 3.3 minutes). There were no instances of major or minor complications by the seventh day in any patients.

Published
2006

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