411 results on '"Hiroshi Ohtani"'
Search Results
2. A cross-sectional, multicenter survey of the prevalence and risk factors for Long COVID
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Waki Imoto, Koichi Yamada, Ryota Kawai, Takumi Imai, Kengo Kawamoto, Masato Uji, Hidenori Kanda, Minoru Takada, Yoshiteru Ohno, Hiroshi Ohtani, Manami Kono, Atsuhito Hikiishi, Yosuke Eguchi, Hiroki Namikawa, Tomoya Kawaguchi, and Hiroshi Kakeya
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Medicine ,Science - Abstract
Abstract Long-term sequelae of the coronavirus disease (COVID-19) constitute Long COVID. Although Long COVID has been reported globally, its risk factors and effects on quality of life (QOL) remain unclear. We conducted a cross-sectional study using questionnaires and electronic medical records of COVID-19 patients who were diagnosed or hospitalized at five facilities in Japan. Responses were obtained from 285 out of 1,150 patients. More than half of the participants reported Long COVID symptoms of varying severity 1 year after COVID-19. Common sequelae included fatigue, dyspnea, alopecia, concentration problems, memory problems, sleeplessness, and joint pain, which often significantly reduced their QOL. COVID-19 severity was strongly associated with sputum production, chest pain, dyspnea, sore throat, and diarrhea, but not with fatigue, dysgeusia, anosmia, alopecia, and sleeplessness. Fatigue, dysgeusia, anosmia, alopecia, and sleeplessness affected the QOL among participants with asymptomatic or mild COVID-19 during the acute phase. Moreover, these sequelae persisted for prolonged periods.
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- 2022
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3. Comparative effects of topiroxostat and febuxostat on arterial properties in hypertensive patients with hyperuricemia
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Kazuomi Kario, Masafumi Nishizawa, Mari Kiuchi, Arihiro Kiyosue, Fumishi Tomita, Hiroshi Ohtani, Yasuhisa Abe, Hideyo Kuga, Satoshi Miyazaki, Takatoshi Kasai, Makiko Hongou, Takanori Yasu, Jin Kuramochi, Yoshihiro Fukumoto, Satoshi Hoshide, and Ichiro Hisatome
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arterial stiffness ,cardio‐ankle vascular index ,hypertension ,hyperuricemia ,xanthine oxidoreductase inhibitors ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Elevated serum uric acid is a cardiovascular risk factor in patients with hypertension, even when blood pressure (BP) is well controlled. Xanthine oxidoreductase inhibitors (XORi) reduce serum uric acid levels and have several other potential effects. This multicenter, randomized, open‐label study compared the effects of two XORi, topiroxostat and febuxostat, on arterial stiffness, uric acid levels, and BP in hypertensive patients with hyperuricemia. Patients received topiroxostat 40–160 mg/day or febuxostat 10–60 mg/day, titrated to maintain serum uric acid
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- 2021
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4. Multiple Myeloma–Associated Ig Light Chain Crystalline Cast Nephropathy
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Hirotoshi Matsumura, Yusuke Furukawa, Takashi Nakagaki, Chikako Furutani, Sayaka Osanai, Keiichi Noguchi, Masafumi Odaka, Masafumi Yohda, Hiroshi Ohtani, Yoshihiro Michishita, Yoshinari Kawabata, Atsushi Kitabayashi, Sho Ikeda, Mizuho Nara, Atsushi Komatsuda, Naoto Takahashi, and Hideki Wakui
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Diseases of the genitourinary system. Urology ,RC870-923 - Published
- 2020
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5. Case reports of a c.475G>T, p.E159* lamin A/C mutation with a family history of conduction disorder, dilated cardiomyopathy and sudden cardiac death
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Tetsuro Yokokawa, Shohei Ichimura, Naoko Hijioka, Takashi Kaneshiro, Akiomi Yoshihisa, Hiroyuki Kunii, Kazuhiko Nakazato, Takafumi Ishida, Osamu Suzuki, Seiko Ohno, Takeshi Aiba, Hiroshi Ohtani, and Yasuchika Takeishi
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Lamin A/C ,Dilated cardiomyopathy ,Sudden cardiac death ,+T%22">c.475G > T ,p.E159* ,Case report ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Background Patients with some mutations in the lamin A/C (LMNA) gene are characterized by the presence of dilated cardiomyopathy (DCM), conduction abnormalities, ventricular tachyarrhythmias (VT), and sudden cardiac death (SCD). Various clinical features have been observed among patients who have the same LMNA mutation. Here, we show a family with cardiac laminopathy with a c.475G > T, p.E159* LMNA mutation, and a family history of conduction disorder, DCM, VT, and SCD. Case presentation A proband (female) with atrial fibrillation and bradycardia was implanted with a pacemaker in her fifties. Twenty years later, she experienced a loss of consciousness due to polymorphic VT. She had a serious family history; her mother and elder sister died suddenly in their fifties and sixties, respectively, and her nephew and son were diagnosed as having DCM. Genetic screening of the proband, her son, and nephew identified a nonsense mutation (c.475G > T, p.E159*) in the LMNA gene. Although the proband’s left ventricular ejection fraction remained relatively preserved, her son and nephew’s left ventricular ejection fraction were reduced, resulting in cardiac resynchronization therapy by implantation of a defibrillator. Conclusions In this family with cardiac laminopathy with a c.475G > T, p.E159* LMNA mutation, DCM, SCD, and malignant VT occurred. Clinical manifestation of various atrial and ventricular arrhythmias and heart failure with reduced ejection fraction occurred in an age-dependent manner in all family members who had the nonsense mutation. It appears highly likely that the E159* LMNA mutation is related to various cardiac problems in the family of the current report.
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- 2019
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6. A case of bowel perforation due to traumatic hernia at a pelvic fracture site: a case report and review of the literature
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Ryota Tanaka, Hisashi Nagahara, Kiyoshi Maeda, Hiroshi Ohtani, Masatsune Shibutani, Tatsuro Tamura, Tetsuro Ikeya, Kenji Sugano, Yasuhito Iseki, Katsunobu Sakurai, Sadaaki Yamazoe, Kenjiro Kimura, Takahiro Toyokawa, Ryosuke Amano, Naoshi Kubo, Hiroaki Tanaka, Kazuya Muguruma, Kosei Hirakawa, and Masaichi Ohira
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Bowel perforation ,Traumatic hernia ,Pelvic fracture ,Emergency operation ,Surgery ,RD1-811 - Abstract
Abstract Background Common complications of pelvic fractures include visceral injury, large-volume hemorrhage, genitourinary injury, rectal injury, and pulmonary embolism. On the other hand, traumatic hernia is a rare complication, especially in association with pelvic fractures. We report a case of bowel perforation due to traumatic hernia at a pelvic fracture site. Case presentation A 65-year-old female was presented at our hospital for further examination and treatment of ileus. She was diagnosed with bowel perforation due to traumatic hernia at a pelvic fracture site, and an emergency operation was thus immediately performed. We performed segmental jejunum resection and constructed jejunostomy, and the iliac bone fracture was fixed with four pins. In the postoperative course, she received antibiotics and vasopressors for septic shock. However, there was no need for either a ventilator, dialysis or admission to the ICU. At seven days after the operation, a residual abscess was detected in the pouch of Douglas. We performed percutaneous drainage (Clavien-Dindo IIIa) and jejunostomy closedown 35 days after the first operation. The postoperative course was without complication, but she received rehabilitation until she was able to walk unaided. She was discharged 64 days after the first operation. Conclusion The occurrence of traumatic hernia is rare, especially in association with pelvic fractures. Although its rarity, traumatic hernia follows a severe course. Thus, proper diagnosis and effective treatment are necessary. Surgeons treating patients with pelvic injuries should consider the possibility of any complications and perform a work-up examination in order to achieve an accurate diagnosis at an earlier time point.
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- 2017
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7. Calphad Modeling of LRO and SRO Using ab initio Data
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Masanori Enoki, Bo Sundman, Marcel H. F. Sluiter, Malin Selleby, and Hiroshi Ohtani
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calphad ,DFT ,thermodynamic models ,phase diagrams ,Mining engineering. Metallurgy ,TN1-997 - Abstract
Results from DFT calculations are in many cases equivalent to experimental data. They describe a set of properties of a phase at a well-defined composition and temperature, T, most often at 0 K. In order to be practically useful in materials design, such data must be fitted to a thermodynamic model for the phase to allow interpolations and extrapolations. The intention of this paper is to give a summary of the state of the art by using the Calphad technique to model thermodynamic properties and calculate phase diagrams, including some models that should be avoided. Calphad models can decribe long range ordering (LRO) using sublattices and there are model parameters that can approximate short range ordering (SRO) within the experimental uncertainty. In addition to the DFT data, there is a need for experimental data, in particular, for the phase diagram, to determine the model parameters. Very small differences in Gibbs energy of the phases, far smaller than the uncertainties in the DFT calculations, determine the set of stable phases at varying composition and T. Thus, adjustment of the DFT results is often needed in order to obtain the correct set of stable phases.
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- 2020
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8. A Meta-Analysis of the Short- And Long-Term Results of Randomized Controlled Trials That Compared Laparoscopy-Assisted and Open Colectomy for Colon Cancer
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Hiroshi Ohtani, Yutaka Tamamori, Yuichi Arimoto, Yukio Nishiguchi, Kiyoshi Maeda, Kosei Hirakawa
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Purpose: We conducted a meta-analysis to evaluate and compare the short- and long-term results of laparoscopy-assisted colectomy (LAC) and open colectomy (OC) for colon cancer.Methods: We searched MEDLINE, EMBASE, Science Citation Index, and Cochrane Controlled Trial Register for relevant papers published between January 1990 and October 2011 by using the search terms “laparoscopy,” “laparoscopy-assisted,” “surgery,” “colectomy,” “colon cancer,” and “randomized clinical trials (RCTs)”. We analyzed the outcomes of each type of surgery over short- and long-term periods.Results: We selected 12 papers reporting RCTs that compared LAC with OC for colon cancer. Our meta-analysis included 4614 patients with colon cancer; of these, 2444 had undergone LAC and 2170 had undergone OC. In the short-term period, we found that the rates of overall postoperative complications and ileus in LAC were lower than in OC groups. LAC was associated with a reduction in intraoperative blood loss, a shorter duration of time to resumption and hospital stay, and lower rates of overall complication and ileus over the short-term, but with similar long-term oncologic outcomes such as overall and cancer-related mortality, overall recurrence, local recurrence, distant metastasis, and wound-site recurrence, compared to OC.Conclusions: It is suggested that LAC may be preferred to OC for colon cancer.
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- 2012
9. A Meta-Analysis of the Short- and Long-Term Results of Randomized Controlled Trials That Compared Laparoscopy-Assisted and Conventional Open Surgery for Colorectal Cancer
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Hiroshi Ohtani, Yutaka Tamamori, Yuichi Arimoto, Yukio Nishiguchi, Kiyoshi Maeda, Kosei Hirakawa
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Purpose: We conducted a meta-analysis to evaluate and compare the short- and long-term results of laparoscopic colorectal surgery (LCRS) and conventional open surgery (OCRS) for colorectal cancer (CRC).Methods: We searched relevant papers published between January 1990 and May 2011. We analyzed the outcomes of each type of surgery over the short- and long-term periods.Results: In the short-term period, we found no significant differences in overall perioperative complications and anastomotic leakage between LCRS and OCRS groups. We found no significant differences in overall, distant, local and wound-site recurrence, overall mortality, 3 and 5 year disease-free survival rate, and cancer-related mortality between the 2 groups.Conclusions: LCRS has the benefits of reducing intraoperative blood loss, earlier resumption of oral intake, and shorter duration of hospital stay in the short-term. The long-term outcomes of LCRS seem to be similar to those of OCRS.
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- 2011
10. Impact of the Preoperative Controlling Nutritional Status (CONUT) Score on the Survival after Curative Surgery for Colorectal Cancer.
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Yasuhito Iseki, Masatsune Shibutani, Kiyoshi Maeda, Hisashi Nagahara, Hiroshi Ohtani, Kenji Sugano, Tetsuro Ikeya, Kazuya Muguruma, Hiroaki Tanaka, Takahiro Toyokawa, Katsunobu Sakurai, and Kosei Hirakawa
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Medicine ,Science - Abstract
Recently, the preoperative immune-nutritional status has been reported to correlate with the survival rate in patients with colorectal cancer (CRC). However, there have been no reports on the relationship between the controlling nutritional status (CONUT) score and the clinical outcome after curative surgery for CRC. We herein evaluated the prognostic significance of the CONUT score in patients with CRC, and then compared the accuracy of the CONUT score and the prognostic nutritional index (PNI) as a predictor of survival.We retrospectively reviewed a database of 204 patients who underwent curative surgery for Stage II/III CRC. Patients were divided into two groups according to the CONUT score and the PNI.The five-year cancer-specific survival (CSS) rate was significantly higher at 92.7% in the low CONUT group, compared to a rate of 81.0% in the high CONUT group (p=0.0016). The five-year CSS was 71.2% in the low PNI group and 92.3% in the high PNI group, which showed a significant difference (p=0.0155). A multivariate analysis showed that lymph node metastasis and the CONUT score were independent risk factors for CSS.This study suggested that the CONUT score is a strong independent predictor of the survival among CRC patients.
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- 2015
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11. Relationship between Lattice Strain and Ordering Tendency in Medium-Entropy Alloys.
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Masanori Enoki and Hiroshi Ohtani
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THERMAL equilibrium ,ATOMIC displacements ,TEMPERATURE effect ,ABSOLUTE value ,LOW temperatures - Abstract
In this study, thermodynamic quantities were investigated using cluster expansion and the variational method for high-entropy and medium-entropy alloys (HEAs and MEAs, respectively). In the alloy systems combined with elements that tend to form HEAs, the absolute enthalpy value was small, and the entropy term was close to the value of an ideal solution. The tendency of ordering and the accompanying change in mean square atomic displacement (MSAD) were investigated in detail for four MEAs; namely, the FeCoNi, MnFeNi, MnCoNi, and CrCoNi systems. For these alloys, the ordering tendency and the phase-separation tendency in the low-temperature region were investigated. In addition, the presence of short-range order (SRO) in the high-temperature range was confirmed from the analysis using the Warren--Cowley order parameter. Thermal equilibrium structures were used to evaluate the MSADs at various temperatures. Long-range ordering developing at low temperature tended to reduce MSAD, although in the high temperature range the effect on MSAD from the SRO was very small. [ABSTRACT FROM AUTHOR]
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- 2024
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12. Current Status and Future Scope of Phase Diagram Studies
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Masanori Enoki, Satoshi Minamoto, Ikuo Ohnuma, Taichi Abe, and Hiroshi Ohtani
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Mechanics of Materials ,Mechanical Engineering ,Materials Chemistry ,Metals and Alloys - Published
- 2023
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13. Effect of Alloying Elements on Grain Boundary Segregation of Boron and Carbon in α-Iron
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Tatsuya Tokunaga, Yuta Motomura, Hidenori Era, Toshihiro Tsuchiyama, Kazuhisa Shobu, Mitsuhiro Hasebe, and Hiroshi Ohtani
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Materials Chemistry ,Metals and Alloys ,Physical and Theoretical Chemistry ,Condensed Matter Physics - Published
- 2023
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14. A Case of Anorectal Malakoplakia with Ectopic Recurrence in the Inguinal Region
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Akira MUROTA, Ippei YAMANA, Jun OHISHI, Hiroki TANI, Hiroshi OHTANI, and Suguru HASEGAWA
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General Engineering ,General Earth and Planetary Sciences ,General Environmental Science - Published
- 2022
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15. Intracerebral hemorrhage due to vasculitis following COVID-19 vaccination: a case report
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Tooru Inoue, Shuji Hayashi, Kenji Fukuda, Takahisa Koga, Yuki Kouzaki, Ryuhei Takeyama, and Hiroshi Ohtani
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Vasculitis ,medicine.medical_specialty ,Pediatrics ,COVID-19 Vaccines ,Neurology ,Coronavirus disease 2019 (COVID-19) ,medicine ,Humans ,Adverse effect ,BNT162 Vaccine ,Cerebral Hemorrhage ,Case Report - Vascular Neurosurgery - Other ,Intracerebral hemorrhage ,Vaccines, Synthetic ,medicine.diagnostic_test ,SARS-CoV-2 ,business.industry ,Vaccination ,COVID-19 ,Interventional radiology ,medicine.disease ,Surgery ,mRNA Vaccines ,Neurology (clinical) ,Neurosurgery ,business - Abstract
Several vaccines have been approved worldwide for the prevention of morbidity and mortality against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). However, the development of these vaccines has raised concerns regarding their adverse effects. Herein, we report the first case of intracerebral hemorrhage (ICH) due to vasculitis after the first dose of mRNA vaccine (BNT162b2, Pfizer/BioN-Tech). Although this case cannot demonstrate a direct relationship between COVID-19 vaccination and vasculitis, the clinical and histological features of this patient are highly consistent with the adverse effects of COVID-19 vaccine.
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- 2021
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16. Personal and Objective Ethics: How to Read theCrito
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Hiroshi Ohtani
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Philosophy - Abstract
Dominant interpretations of Plato'sCritoattempt to reconstruct the text deductively, taking the arguments in the famous Laws’ speech as consisting solely in the application of general principles to facts. It is thus conceived that the principles and facts are grasped independently of each other, and then the former are applied to the latter, subsequently reaching the conclusion that Socrates must not escape. Following the lead of Cora Diamond, who argues against this ‘generalist interpretation’, I argue that the Laws’ speech essentially involves an exercise of our moral imagination through which both principles and the facts to which they apply are grasped. This is not to say that a deductive argument is absent from the Laws’ speech. Rather, for the first time, we understand how the deductive arguments in the Laws’ speech can function through imagining a life in which these arguments make sense. TheCritois an attempt to exercise the readers’ imagination, thereby presenting ethics that is both personal and objective. Understanding the Laws’ arguments essentially requires the readers’ imaginative involvement with Socrates’ personal story, but they still have objective import.
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- 2021
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17. Real-world clinical outcomes of treatment with molnupiravir for patients with mild- to-moderate coronavirus disease 2019 during the Omicron variant pandemic
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Yasuhito Suzuki, Yoko Shibata, Hiroyuki Minemura, Takefumi Nikaido, Yoshinori Tanino, Atsuro Fukuhara, Ryuzo Kanno, Hiroyuki Saito, Shuzo Suzuki, Yayoi Inokoshi, Eiichiro Sando, Hirofumi Sakuma, Tatsuho Kobayashi, Hiroaki Kume, Masahiro Kamimoto, Hideko Aoki, Akira Takama, Taku Iizuka, Takamichi Kamiyama, Masaru Nakayama, Kiyoshi Saito, Koichi Tanigawa, Masahiko Sato, Yuichi Waragai, Toshiyuki Kambe, Norio Kanzaki, Teruhisa Azuma, Hiromasa Okamoto, Keiji Sakamoto, Yuichi Nakamura, Hiroshi Ohtani, Mitsuru Waragai, Shinsaku Maeda, Tokiya Ishida, Keishi Sugino, Wataru Abe, Yasuhiko Tsukada, Tomoyoshi Lee, Ryuki Yamada, Riko Sato, Takumi Onuma, Hikaru Tomita, Mikako Saito, Natsumi Watanabe, Mami Rikimaru, Takaya Kawamata, Julia Morimoto, Ryuichi Togawa, Yuki Sato, Junpei Saito, Kenya Kanazawa, Sugihiro Hamaguchi, and Ken Iseki
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Background It is unclear whether molnupiravir has a beneficial effect on vaccinated patients infected with the Omicron variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). We here evaluated the efficacy of molnupiravir in patients with mild-to-moderate coronavirus disease 2019 (COVID-19) during the Omicron variant surge in Fukushima Prefecture, Japan. Methods We enrolled patients with mild-to-moderate COVID-19 who were admitted to hospitals between January and April, 2022. Clinical deterioration after admission was compared between molnupiravir users (n = 281) and non-users (n = 1,636). Results The molnupiravir users were older (P
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- 2022
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18. Reduced port laparoscopic surgery using umbilical zigzag incision for Meckel’s diverticulitis
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Ippei Yamana, Yasuhide Fuchino, Jun Ohishi, Suguru Hasegawa, Hiroshi Ohtani, Tatsuya Hashimoto, and Hiroki Tani
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Laparoscopic surgery ,medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,Cosmesis ,Case Report ,Reduced port laparoscopic surgery ,Diverticulitis ,Zigzag incision ,medicine.disease ,Resection ,Surgery ,Port (medical) ,Meckel's diverticulitis ,medicine ,Presentation (obstetrics) ,business ,Meckel’s diverticulitis ,Diverticulum - Abstract
Highlights • In our case report, we suggested that reduced port laparoscopic surgery using an umbilical zigzag incision is comparable to conventional multiport laparoscopic surgery. • This method is associated with improved cosmesis and decreased wound pain. • We herein report a case involving interval resection of Meckel’s diverticulum using a transumbilical approach with a zigzag incision, which was performed three months after the appearance of symptoms., Introduction Reduced port laparoscopic surgery using an umbilical zigzag incision is comparable to conventional multiport laparoscopic surgery. This method is associated with improved cosmesis and decreased wound pain. Presentation of case A 67-year-old man visited our hospital. He presented emergency room with a chief complaint of right lower abdominal pain by walking. The patient was diagnosed Meckel’s diverticulitis by computed tomography (CT). At first, antibiotics therapy and fasting were performed. Three months later, the patient underwent resection of Meckel’ diverticulum with zigzag transumbilical laparoscopic surgery. The patient’s postoperative course was good, and he rarely felt wound pain. The patient started oral intake three days after surgery, and was discharged 10 days after surgery. Discussion Zigzag transumbilical laparoscopic surgery is very useful for resection of the small intestine. This method is associated with improved cosmesis and decreased wound pain. In the case of Meckel’s diverticulitis, we suggest that interval resection of Meckel’s diverticulum was very useful as it was an operation that could be performed easily. Conclusion Reduced port laparoscopic surgery using an umbilical zigzag incision is considered to be an excellent technique in terms of operability and aesthetic outcomes.
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- 2021
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19. Reflective Equilibrium from a Wittgensteinian Perspective
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Hiroshi Ohtani
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Philosophy of mind ,Philosophy of science ,Reflective equilibrium ,media_common.quotation_subject ,Philosophy ,05 social sciences ,Enlightenment ,06 humanities and the arts ,0603 philosophy, ethics and religion ,050105 experimental psychology ,Epistemology ,Philosophy of language ,060302 philosophy ,Justice (virtue) ,0501 psychology and cognitive sciences ,Private language argument ,media_common ,Philosophical methodology - Abstract
The lingering mystery of John Rawls’s reflective equilibrium is that its nature is unclear. Rawls at times suggests he is merely describing people’s conceptions of justice, whereas at other times he implies that his reflective equilibrium is a way to justify his conception of justice. Faced with seemingly conflictual passages, most scholars privilege the justificatory ones. However, I argue that this is not an effective strategy because understanding how the descriptive and justificatory aspects of reflective equilibrium fit together is the key to unlocking its nature and actual force. This paper compares Rawls’s method to the philosophical method of later Wittgenstein in his so-called private language argument to argue how the descriptive and justificatory aspects of Rawls’s reflective equilibrium fit together. In my view, both philosophers’ methods are descriptive clarifications of our unclear conceptions. However, their clarification is not just descriptive; they also aim at their readers achieving enlightenment. Importantly, I argue, that enlightenment offers us justification of the conception resulting from their clarification. Hence, their methods are justificatory as well. Finally, I claim that this way of understanding reflective equilibrium makes us realise how Rawls could respond to a prominent objection to it.
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- 2021
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20. Comparative effects of topiroxostat and febuxostat on arterial properties in hypertensive patients with hyperuricemia
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Hideyo Kuga, Satoshi Hoshide, Mari Kiuchi, Kazuomi Kario, Yoshihiro Fukumoto, Takatoshi Kasai, Hiroshi Ohtani, Takanori Yasu, Yasuhisa Abe, Makiko Hongou, Fumishi Tomita, Satoshi Miyazaki, Arihiro Kiyosue, Masafumi Nishizawa, Jin Kuramochi, and Ichiro Hisatome
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medicine.medical_specialty ,hypertension ,Pyridines ,Endocrinology, Diabetes and Metabolism ,Urinary system ,Urology ,Hyperuricemia ,030204 cardiovascular system & hematology ,Gout Suppressants ,03 medical and health sciences ,chemistry.chemical_compound ,Febuxostat ,0302 clinical medicine ,Nitriles ,Internal Medicine ,Humans ,Medicine ,030212 general & internal medicine ,Morning ,Original Paper ,business.industry ,cardio‐ankle vascular index ,medicine.disease ,Uric Acid ,Topiroxostat ,Treatment Outcome ,arterial stiffness ,Blood pressure ,chemistry ,Arterial stiffness ,Uric acid ,xanthine oxidoreductase inhibitors ,Cardiology and Cardiovascular Medicine ,business ,medicine.drug - Abstract
Elevated serum uric acid is a cardiovascular risk factor in patients with hypertension, even when blood pressure (BP) is well controlled. Xanthine oxidoreductase inhibitors (XORi) reduce serum uric acid levels and have several other potential effects. This multicenter, randomized, open‐label study compared the effects of two XORi, topiroxostat and febuxostat, on arterial stiffness, uric acid levels, and BP in hypertensive patients with hyperuricemia. Patients received topiroxostat 40–160 mg/day or febuxostat 10–60 mg/day, titrated to maintain serum uric acid, This multicenter, randomised, open‐label study compared the effects of two xanthine oxidoreductase inhibitors, topiroxostat and feboxostat, on arterial stiffness, uric acid levels and blood pressure (BP) in hypertensive patients with hyperuricemia. Neither topiroxostat nor feboxostat had any significant effects on arterial stiffness (measured using the cardio‐ankle vascular index) over 24 weeks' treatment; but both agents significantly reduced serum uric acid levels and morning home systolic BP compared with baseline.
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- 2021
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21. Electron Theory Calculation of Thermodynamic Properties of Steels and Its Application to Theoretical Phase Diagram of the Fe-Mo-B Ternary System
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Soei Mitomi, Masanori Enoki, Kota Takahashi, and Hiroshi Ohtani
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Materials science ,Ternary numeral system ,Materials Chemistry ,Metals and Alloys ,Thermodynamics ,Electron ,Physical and Theoretical Chemistry ,Condensed Matter Physics ,Phase diagram - Published
- 2021
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22. Spontaneous Rupture of Pancreatic Acinar Cell Carcinoma: Report of a Case
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Naoshi Kubo, Ryosuke Amano, Kotaro Miura, Kosei Hirakawa, Katsunobu Sakurai, Go Ohira, Kiyoshi Maeda, Kenjiro Kimura, Hisashi Nagahara, Hiroaki Tanaka, Takahiro Toyokawa, Masatsune Shibutani, Kazuya Muguruma, Masasichi Ohira, Kohei Nishio, Hiroshi Ohtani, Sadaaki Yamazoe, and Masakazu Yashiro
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Spontaneous rupture ,Pathology ,medicine.medical_specialty ,business.industry ,Medicine ,Surgery ,business ,Pancreatic Acinar Cell Carcinoma - Abstract
Introduction Pancreatic acinar cell carcinoma (ACC) is a relatively rare neoplasm. Furthermore, tumor rupture is extremely rare. Only 1 case of ruptured pancreatic ACC has been reported, and the long-term outcome of the case is unknown. Here, we present a case of spontaneously ruptured ACC with long-term survival after successful resection. Case Presentation A 67-year-old man was brought to our hospital by ambulance, presenting with progressive left abdominal pain. Laboratory data showed an increased inflammatory response, and contrast-enhanced computed tomography showed a mass in the pancreas tail with nonuniform enhancement in the early phase. Fluid collection was detected around the spleen to the left kidney. Spontaneous rupture of a pancreatic tumor was strongly suspected. After improvement of his general condition, the patient underwent resection of the pancreas and adjacent organs. The resected tumor was surrounded by organs and adipose tissue, so obvious exposure was not observed in the surgical margins. Pathologically, neither exposure of tumor cells at the surgical margins nor lymph node involvement was detected. The patient has survived 80 months since initial diagnosis without any evidence of recurrence. Conclusion Although ruptured pancreatic ACC has the potential for dissemination, surgical resection including adjacent organs remains an option for curative treatment.
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- 2021
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23. Electron Theory Calculation of Thermodynamic Properties of Steels and Its Application to Theoretical Phase Diagram of the Fe–Mo–B Ternary System
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Masanori Enoki, Hiroshi Ohtani, Kota Takahashi, and Soei Mitomi
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Materials science ,Ternary numeral system ,Mechanics of Materials ,Mechanical Engineering ,Materials Chemistry ,Metals and Alloys ,Thermodynamics ,Electron ,Phase diagram - Published
- 2020
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24. Idiopathic myointimal hyperplasia of mesenteric veins depicted by barium enema examination, and conventional and magnifying colonoscopy
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Keisuke Kawasaki, Shinichiro Kawatoko, Takehiro Torisu, Yusuke Mizuuchi, Toshimi Iura, Hiroshi Ohtani, Katsuki Okamura, Hidetaka Yamamoto, Masafumi Nakamura, and Takanari Kitazono
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Male ,Hyperplasia ,Mesenteric Veins ,Colon, Sigmoid ,Gastroenterology ,Humans ,General Medicine ,Colonoscopy ,Aged ,Barium Enema - Abstract
A 71-year-old man was admitted to our institution complaining of abdominal pain and constipation. Barium enema examination revealed narrowing, cobble stoning, and longitudinal ulcerations in the sigmoid colon and upper rectum. Conventional colonoscopy, magnifying narrow-band imaging endoscopy, and magnifying chromoendoscopy revealed edematous mucosa, longitudinal ulcerations with luminal narrowing, and multiple pseudopolyps. The histologic examination of the biopsy specimens showed thick-walled (arterialized) capillaries and subendothelial fibrin deposits in the mucosa and submucosa. Based on a preoperative diagnosis of idiopathic myointimal hyperplasia of mesenteric veins (IMHMV), he underwent a laparoscopic resection of the sigmoid colon and upper rectum. The histologic examination of the resected specimens showed marked proliferation of venous walls with marked myointimal thickening and luminal occlusion from the submucosa to the mesentery throughout the entire resected tissue section. The final diagnosis was IMHMV.
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- 2022
25. Thermodynamic Analysis of the Al-Mg-Zn Ternary System
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Naohiro Hayashi, Masanori Enoki, Kazuki Nakashima, and Hiroshi Ohtani
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Materials science ,Ternary numeral system ,Mechanics of Materials ,Materials Chemistry ,Metals and Alloys ,Thermodynamics ,Laves phase ,Condensed Matter Physics ,Phase diagram - Published
- 2020
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26. Formation and Stability of Solute Enriched Stacking Fault in the Mg–Zn–Y, Mg–Co–Y and Mg–Zn–Ca Ternary Systems
- Author
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Eiji Abe, I. Ohnuma, M. Egami, Hiroshi Ohtani, and Masanori Enoki
- Subjects
Crystallography ,Materials science ,Mechanics of Materials ,Mechanical Engineering ,General Materials Science ,Condensed Matter Physics ,Ternary operation ,Stacking fault - Published
- 2020
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27. Nano Clustering of Interstitial and Substitutional Solute Atoms in Steels
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Tokuteru Uesugi, Hiroshi Numakura, Masanori Enoki, Hiroshi Ohtani, Goro Miyamoto, and Tadashi Furuhara
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Thesaurus (information retrieval) ,Search engine ,Materials science ,Nano ,Nanotechnology ,Cluster analysis - Published
- 2020
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- View/download PDF
28. Thermodynamic Analysis of the Formation Process of Metastable Carbides in Iron–Carbon Martensite
- Author
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Yohei Osawa, Masanori Enoki, and Hiroshi Ohtani
- Subjects
Materials science ,chemistry ,Scientific method ,Martensite ,Metastability ,Metallurgy ,Materials Chemistry ,Metals and Alloys ,chemistry.chemical_element ,Physical and Theoretical Chemistry ,Condensed Matter Physics ,Carbon ,Carbide - Published
- 2020
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29. Thermodynamic Analysis of the Fe-Mo-B Ternary System
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Masaaki Fujioka, Kota Takahashi, Masanori Enoki, Kyohei Ishikawa, and Hiroshi Ohtani
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Ternary numeral system ,Materials science ,Materials Chemistry ,Metals and Alloys ,Physical chemistry ,Physical and Theoretical Chemistry ,Condensed Matter Physics - Published
- 2020
- Full Text
- View/download PDF
30. Application of First Principles Calculation and Related Methods to Steels
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Masanori Enoki and Hiroshi Ohtani
- Published
- 2022
- Full Text
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31. Atypical Urothelial Cells (AUC)
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Güliz A. Barkan, Margaret L. Compton, Tarik M. Elsheikh, Kim A. Ely, Daniel F. I. Kurtycz, Merce Jorda, Zahra Maleki, Sachiko Minamiguchi, Hiroshi Ohtani, Eric Piaton, Bo Ping, Spasenija Savic Prince, Z. Laura Tabatabai, and Christopher J. VandenBussche
- Published
- 2022
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- View/download PDF
32. Sublattice alloy design of high-strength steels: Application of clustering and nanoscale precipitation of interstitial and substitutional solutes
- Author
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Tadashi Furuhara, Yongjie Zhang, Mitsutaka Sato, Goro Miyamoto, Masanori Enoki, Hiroshi Ohtani, Tokuteru Uesugi, and Hiroshi Numakura
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Mechanics of Materials ,Mechanical Engineering ,Metals and Alloys ,General Materials Science ,Condensed Matter Physics - Published
- 2023
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33. Effect of Hydrogen on the Substructure of Lenticular Martensite in Fe-31Ni Alloy
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Masanori Enoki, Hirotaka Tai, Nobuhiro Tsuji, Akinobu Shibata, Nahoko Saji, Hiroshi Ohtani, Kaneaki Tsuzaki, and Motomichi Koyama
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010302 applied physics ,Materials science ,Hydrogen ,Metallurgy ,Alloy ,0211 other engineering and technologies ,Metals and Alloys ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,Condensed Matter Physics ,01 natural sciences ,Solid solution strengthening ,chemistry ,Mechanics of Materials ,Transmission electron microscopy ,Diffusionless transformation ,Martensite ,0103 physical sciences ,engineering ,Substructure ,Composite material ,Crystal twinning ,021102 mining & metallurgy - Abstract
This study investigated the effect of hydrogen on the substructure of martensite in Fe-31Ni alloy. In both the hydrogen-charged and uncharged specimens, typical lenticular martensite plates formed after subzero cooling. However, we found that the fraction of twinned region (including the area of midrib) in lenticular martensite plate increased with increasing hydrogen content. In addition, the width of individual twins in the hydrogen-charged specimen was slightly smaller than that in the uncharged specimen. These results indicated that the existence of hydrogen facilitated twinning deformation as a lattice invariant deformation. We presented a comprehensive discussion about the reason why hydrogen enhanced twinning deformation. Even though tetragonality of martensite in the hydrogen-charged specimen could not be confirmed by X-ray diffraction, the transmission electron microscopy observations and the first-principles calculations suggested that hydrogen might increase the tetragonality of martensite. We proposed that solid solution hardening and an increase in the tetragonality of martensite by the existence of hydrogen were the possible reasons for facilitating twinning deformation as a lattice invariant deformation in martensitic transformation.
- Published
- 2019
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34. First-Principles Study of Chemical Driving Force for Face Centered Cubic to Hexagonal Close Packed Martensitic Transformation in Hydrogen-Charged Iron
- Author
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Motomichi Koyama, Y. Kuroki, Shoya Kawano, Satoshi Iikubo, Hiroshi Ohtani, and Kaneaki Tsuzaki
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010302 applied physics ,Materials science ,Condensed matter physics ,Hydrogen ,Metallurgy ,0211 other engineering and technologies ,Metals and Alloys ,Close-packing of equal spheres ,chemistry.chemical_element ,02 engineering and technology ,Hydrogen content ,Cubic crystal system ,Condensed Matter Physics ,01 natural sciences ,Condensed Matter::Materials Science ,chemistry ,Mechanics of Materials ,Phase (matter) ,Diffusionless transformation ,0103 physical sciences ,Metallic materials ,Physics::Atomic and Molecular Clusters ,021102 mining & metallurgy - Abstract
This study uses first-principles calculations to investigate the effect of hydrogen on the chemical driving force of the transformation of iron from the face centered cubic (FCC) to hexagonal close packed (HCP) phase. The minimum energy path from FCC to HCP phases shows that FCC becomes stable with increasing hydrogen content. Furthermore, the energy difference between the FCC and HCP phases is observed to be smaller in Fe2H than in Fe throughout the temperature region. These results clearly explain the observed anomalous suppression of the martensitic transformation in the hydrogen-charged steel.
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- 2019
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35. Experimental ordinary language philosophy: a cross-linguistic study of defeasible default inferences
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Joachim Horvath, Hiroshi Ohtani, Eugen Fischer, and Paul E. Engelhardt
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Philosophy of science ,Salience (language) ,05 social sciences ,General Social Sciences ,Defeasible estate ,06 humanities and the arts ,Ordinary language philosophy ,0603 philosophy, ethics and religion ,Argument from illusion ,050105 experimental psychology ,Epistemology ,Philosophy of language ,Philosophy ,Argument ,060302 philosophy ,0501 psychology and cognitive sciences ,Experimental philosophy ,Psychology - Abstract
This paper provides new tools for philosophical argument analysis and fresh empirical foundations for ‘critical’ ordinary language philosophy. Language comprehension routinely involves stereotypical inferences with contextual defeaters. J.L. Austin’sSense and Sensibiliafirst mooted the idea that contextually inappropriate stereotypical inferences from verbal case-descriptions drive some philosophical paradoxes; these engender philosophical problems that can be resolved by exposing the underlying fallacies. We build on psycholinguistic research on salience effects to explain when and why even perfectly competent speakers cannot help making stereotypical inferences which are contextually inappropriate. We analyse a classical paradox about perception (‘argument from illusion’), suggest it relies on contextually inappropriate stereotypical inferences from appearance-verbs, and show that the conditions we identified as leading to contextually inappropriate stereotypical inferences are met in formulations of the paradox. Three experiments use a forced-choice plausibility-ranking task to document the predicted inappropriate inferences, in English, German, and Japanese. The cross-linguistic study allows us to assess the wider relevance of the proposed analysis. Our findings open up new perspectives for ‘evidential’ experimental philosophy.
- Published
- 2019
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36. Monte Carlo Simulation for Formation of Ti and N Atoms Nanoclusters in BCC-Fe
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Masanori Enoki and Hiroshi Ohtani
- Subjects
Materials science ,Materials Chemistry ,Metals and Alloys ,Physical and Theoretical Chemistry ,Condensed Matter Physics - Published
- 2019
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- View/download PDF
37. First-principles Calculations of the Effects of Mn, Cr, and Ni on Hydrogen Diffusion in BCC, FCC, and HCP Fe
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Kenji Hirata, Satoshi Iikubo, and Hiroshi Ohtani
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Materials science ,Hydrogen ,Metals and Alloys ,chemistry.chemical_element ,Thermodynamics ,Condensed Matter Physics ,Condensed Matter::Materials Science ,thermodynamics ,nudged elastic band ,chemistry ,Physics::Atomic and Molecular Clusters ,Materials Chemistry ,first principles calculation ,diffusion coefficient ,Physical and Theoretical Chemistry ,Diffusion (business) - Abstract
The effects of Mn, Cr, and Ni addition on the hydrogen diffusion behavior in BCC, FCC, and HCP Fe was investigated by means of first-principles calculations. Diffusion coefficients were estimated quantitatively from the migration energy calculated by the nudged elastic band method and the vibrational energy at every stable and metastable site. The addition of Mn, Cr, and Ni to a BCC lattice has a blocking effect on hydrogen diffusion and decreases the diffusion coefficient of hydrogen. Crystal orbital Hamilton population (COHP) analysis revealed that the weakened bonding between the added element and hydrogen is the origin of the blocking effect. On the other hand, the addition of Mn, Cr, and Ni to FCC and HCP lattices resulted in the formation of hydrogen trap sites. In the FCC case, the diffusion coefficients of Fe31MnH, Fe31CrH, and Fe32H, showed similar values, while that of Fe31NiH was lower. In the HCP case, the diffusion coefficients of the three additional elements showed a decreasing trend. Based on the results of the COHP analysis, we conclude that the octahedral interstitial sites around the additional elements become trap sites in FCC and HCP Fe due to the strengthened bonding between Fe and H.
- Published
- 2019
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38. VEGF-VEGFR2 inhibitor-associated hyaline occlusive glomerular microangiopathy: a Japanese single-center experience
- Author
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Naoto Takahashi, Hideki Wakui, Masatoyo Ozawa, Atsushi Komatsuda, and Hiroshi Ohtani
- Subjects
Adult ,Blood Platelets ,Male ,Vascular Endothelial Growth Factor A ,medicine.medical_specialty ,Pathology ,Hyalin ,Thrombotic microangiopathy ,Physiology ,Kidney Glomerulus ,030232 urology & nephrology ,Immunoglobulins ,Podocyte foot ,030204 cardiovascular system & hematology ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Antineoplastic Agents, Immunological ,Japan ,Physiology (medical) ,Internal medicine ,medicine ,Humans ,Hyaline ,Aged ,Aged, 80 and over ,Proteinuria ,business.industry ,Podocytes ,Thrombotic Microangiopathies ,Microangiopathy ,Integrin beta3 ,Middle Aged ,medicine.disease ,Vascular Endothelial Growth Factor Receptor-2 ,Staining ,Capillaries ,Vascular endothelial growth factor ,Bevacizumab ,chemistry ,Nephrology ,Female ,Kidney Diseases ,medicine.symptom ,business ,Nephrotic syndrome ,Signal Transduction - Abstract
Inhibitors of vascular endothelial growth factor (VEGF)-VEGF receptor 2 (VEGFR2) signaling, such as bevacizumab (Bmab), are used for the treatment of various advanced cancers. However, these inhibitors induce renal thrombotic microangiopathy (TMA). Recently, two European cohort studies showed a distinctive histopathological pseudothrombotic pattern different from TMA in Bmab-treated patients. We analyzed 9 renal biopsies from proteinuric cancer patients treated with VEGF-VEGFR2 inhibitors in our Japanese cohort. Clinical and laboratory features were also assessed in these patients. All 9 patients had moderate to heavy proteinuria with normal or slightly elevated serum creatinine levels. On light microscopy, a patchy pattern of hemispherical/spherical lesions along glomerular capillary walls was a characteristic finding. On immunofluorescence microscopy, staining for immunoglobulins (IgM dominant) at varying intensities was observed mainly along glomerular capillary walls. Especially, hemispherical/spherical positive staining for immunoglobulins was a characteristic pattern. Immunohistochemical studies showed positive staining for immunoglobulins and negative staining for CD61-positive platelets in capillary hemispherical/spherical lesions and positive VEGF staining in podocytes. On electron microscopy, variably electron-dense material in dilated glomerular capillaries and partial effacement of podocyte foot processes were observed. After the withdrawal of VEGF-VEGFR2 inhibitors, proteinuria improved without any specific treatment in 8 patients. Histopathological findings in our patients treated with VEGF-VEGFR2 inhibitors were consistent with those observed in the recently described new form of Bmab-associated hyaline occlusive glomerular microangiopathy. This form should be considered in proteinuric cancer patients treated with VEGF-VEGFR2 inhibitors. Discontinuing VEGF-VEGFR2 inhibitors may lead to improvement of glomerular microangiopathy induced by these drugs.
- Published
- 2021
39. Evaluation of a newly proposed renal risk score for Japanese patients with ANCA-associated glomerulonephritis
- Author
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Masaya Saito, Ayano Saito, Fumito Abe, Chihiro Imaizumi, Hajime Kaga, Masato Sawamura, Mizuho Nara, Masatoyo Ozawa, Ryuta Sato, Takahiro Nakayama, Shin Okuyama, Rie Masai, Hiroshi Ohtani, Atsushi Komatsuda, Hideki Wakui, and Naoto Takahashi
- Subjects
Glomerulonephritis ,Japan ,Nephrology ,Physiology ,Risk Factors ,Physiology (medical) ,Humans ,Kidney Failure, Chronic ,Anti-Neutrophil Cytoplasmic Antibody-Associated Vasculitis ,Prognosis ,Antibodies, Antineutrophil Cytoplasmic ,Retrospective Studies - Abstract
We determined the usefulness and prognostic ability of the renal risk score (RRS), proposed in Europe, for Japanese patients with antineutrophil cytoplasmic antibody (ANCA)-associated glomerulonephritis (AAGN) and high myeloperoxidase (MPO)-ANCA positivity; these aspects remain to be verified.This retrospective study was conducted on 86 Japanese patients with new, biopsy-confirmed AAGN. We calculated the RRS and analyzed the relationship between this classification, and clinicopathological features and prognosis. We also compared the predictive values between RRS for endpoints including renal death and conventional prognostic tools for patients with AAGN.There were 33, 37, and 16 patients in the low-, medium-, and high-risk groups, respectively. All patients were MPO-ANCA positive. The median follow-up period was 33 months; 16 (18.6%) patients progressed to end-stage renal disease (ESRD). In the high-risk group, 9/16 (56.3%) patients progressed to ESRD, and renal prognosis was significantly poorer than that in other groups (low-risk group, P 0.001; medium-risk group, P = 0.004). In Cox multivariate regression analysis, RRS was an independent, poor renal prognostic factor (hazard ratio 5.22; 95% confidence interval 2.20-12.40; P 0.001). The receiver-operating characteristic curves of the RRS for each endpoint were comparable with those of the 2010 histological classification and those of the severity classification of Japanese rapidly progressive glomerulonephritis.This is the first study to report the usefulness of the RRS for predicting renal outcomes among Japanese patients with AAGN. Our predictive value of the RRS was comparable with that of conventional prognostic tools.
- Published
- 2021
40. [A Case of Advanced Gastric Cancer with Extensive Lymph Node Metastasis That Showed pCR to Preoperative Chemotherapy Containing SP]
- Author
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Yoshihito, Yamakoshi, Hiroshi, Ohtani, Mizuki, Nagamori, Shinya, Nomura, Hiroji, Nakagawa, Mami, Yoshii, Tatsuro, Tamura, Takahiro, Toyokawa, Hiroaki, Tanaka, Kazuya, Muguruma, and Masaichi, Ohira
- Subjects
Drug Combinations ,Oxonic Acid ,Gastrectomy ,Stomach Neoplasms ,Lymphatic Metastasis ,Antineoplastic Combined Chemotherapy Protocols ,Humans ,Lymph Node Excision ,Female ,Cisplatin ,Neoplasm Recurrence, Local ,Aged ,Tegafur - Abstract
A 69-year-old woman, who complained of appetite loss, was diagnosed with Type 3 gastric cancer, and a biopsy resulted in the diagnosis of adenocarcinoma(tub2-por), Group 5. Abdominal computed tomography (CT) revealed bulky metastatic lymph nodes around the stomach and the aorta. The diagnosis was cT4a, cN2, cM1(LYM), cStage ⅣB, and SP therapy(a combination of S-1 and cisplatin) was immediately administered. On the completion of 3 courses of SP therapy, both the primary tumor and lymph nodes markedly decreased in size. Based on this finding, D2 total gastrectomy, No. 16 lymph node dissection, splenectomy, and right adrenal tumor resection were performed. Histopathology showed no residual tumor cells in the stomach or lymph nodes. Postoperatively, she received S-1 therapy, which was discontinued on completion of the first course due to its side effects. She survived for over 7 years postoperatively without receiving chemotherapy and showed no recurrence.
- Published
- 2021
41. Calphad Modeling of LRO and SRO Using ab initio Data
- Author
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Marcel H. F. Sluiter, Masanori Enoki, Bo Sundman, Hiroshi Ohtani, and Malin Selleby
- Subjects
lcsh:TN1-997 ,Materials science ,Ab initio ,calphad ,02 engineering and technology ,01 natural sciences ,DFT ,Set (abstract data type) ,symbols.namesake ,thermodynamic models ,Phase (matter) ,0103 physical sciences ,General Materials Science ,Statistical physics ,CALPHAD ,lcsh:Mining engineering. Metallurgy ,Phase diagram ,010302 applied physics ,Metals and Alloys ,Experimental data ,021001 nanoscience & nanotechnology ,Gibbs free energy ,Experimental uncertainty analysis ,symbols ,0210 nano-technology ,phase diagrams - Abstract
Results from DFT calculations are in many cases equivalent to experimental data. They describe a set of properties of a phase at a well-defined composition and temperature, T, most often at 0 K. In order to be practically useful in materials design, such data must be fitted to a thermodynamic model for the phase to allow interpolations and extrapolations. The intention of this paper is to give a summary of the state of the art by using the Calphad technique to model thermodynamic properties and calculate phase diagrams, including some models that should be avoided. Calphad models can decribe long range ordering (LRO) using sublattices and there are model parameters that can approximate short range ordering (SRO) within the experimental uncertainty. In addition to the DFT data, there is a need for experimental data, in particular, for the phase diagram, to determine the model parameters. Very small differences in Gibbs energy of the phases, far smaller than the uncertainties in the DFT calculations, determine the set of stable phases at varying composition and T. Thus, adjustment of the DFT results is often needed in order to obtain the correct set of stable phases.
- Published
- 2020
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42. A new 7-point method facilitates accurate diagnosis of high-grade urothelial carcinoma in routine urinary cytology practice
- Author
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Tatsuro Shimokama, Akihiro Mimura, Mitsuru Kinjo, Hiroshi Ohtani, and Sachiko Iwai
- Subjects
medicine.medical_specialty ,Urologic Neoplasms ,Urinary system ,030209 endocrinology & metabolism ,Diagnostic accuracy ,Urinalysis ,Urine ,Pathology and Forensic Medicine ,03 medical and health sciences ,0302 clinical medicine ,Japan ,Predictive Value of Tests ,Cytology ,medicine ,Humans ,Statistical analysis ,Early Detection of Cancer ,Urothelial carcinoma ,Urine cytology ,Observer Variation ,Microscopy ,medicine.diagnostic_test ,business.industry ,Carcinoma ,Reproducibility of Results ,Point method ,Linear discriminant analysis ,030220 oncology & carcinogenesis ,Radiology ,Neoplasm Grading ,Urothelium ,business - Abstract
Introduction This study was designed to identify the minimal and necessary cell morphologies to be considered for high-precision diagnosis of high-grade urothelial carcinoma (HGUC) in a routine urinary cytology practice. Materials and methods We included 338 urine cytology specimens from 11 medical facilities in Japan. Six experts evaluated these Papanicolaou-stained specimens using their own diagnostic criteria to categorize them within an initial 4-tiered classification system. Of the 338 cases, 70 HGUC and 32 benign cases (with a complete consensus diagnosis of 6 experts) were included for the analysis. Two of the cytologists evaluated the specimens for 20 specific cellular features. The results were analyzed using a contingency table and by discriminant analysis. Results Of the original 338 cases, 165 were originally diagnosed as HGUC, but only 70 (42.4%) were scored as malignant by all participating cytologists; of the 101 benign cases, only 32 (31.7%) were classified as such in all examinations. These specimens were re-evaluated by 6 experts using a panel of 20 specific cellular features used to distinguish between HGUC and benign diseases; tests of significance and discriminant analyses identified 7 critical features that were most useful for cytological diagnosis. Statistical analysis revealed that a focus on these 7 features led to a diagnosis of HGUC with a probability of over 95%. Conclusions The accuracy of our presently used method to evaluate urinary cytology is not consistently high. This novel classification system, which focuses on 7 critical features, facilitates the high accurate diagnosis of HGUC in routine cytology practice.
- Published
- 2020
43. The Seimei telescope project and technical developments
- Author
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Fumihide Iwamuro, Kazuya Matsubayashi, Mikio Kurita, Tetsuya Nagata, Keisuke Takahashi, Kazunari Shibata, Toshinori Maihara, Kouji Ohta, Kodai Yamamoto, Yoshikazu Nakatani, Michitoshi Yoshida, D. Kuroda, Ichiro Jikuya, Masatsugu Iribe, M. Kino, Daisaku Nogami, Hitoshi Tokoro, Hideyuki Izumiura, Hironori Tsutsui, and Hiroshi Ohtani
- Subjects
010309 optics ,Physics ,Telescope ,Space and Planetary Science ,law ,0103 physical sciences ,Astronomy ,Astronomy and Astrophysics ,Planetary system ,010303 astronomy & astrophysics ,01 natural sciences ,law.invention - Abstract
An overview of the Seimei telescope, a 3.8 m optical infrared telescope located on Mt. Chikurinji in the Okayama prefecture of Japan, is presented. Seimei is a segmented-mirror telescope whose primary mirror consists of 18 petal-shaped segments. The telescope tube supporting the thin segmented mirrors is structurally incorporated within large arc-rails providing the elevation axis. The tube has a light-weight homologous structure designed with a genetic algorithm. The total weight of the telescope tube, including 1.4-ton optics, is only 8 tons. By virtue of its light weight, the telescope is able to point at an object anywhere in the observable sky within one minute. The telescope is operated by Kyoto University in collaboration with the National Astronomical Observatory of Japan (NAOJ). Half of the telescope time is used by Kyoto University. The remaining time is open to the Japanese astronomical community. NAOJ is responsible for the management of the open-use time, including handling of the observation proposals. The telescope is now regularly performing scientific observations on the basis of a variety of proposals.
- Published
- 2020
- Full Text
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44. Case reports of a c.475G>T, p.E159* lamin A/C mutation with a family history of conduction disorder, dilated cardiomyopathy and sudden cardiac death
- Author
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Hiroyuki Kunii, Takeshi Aiba, Takashi Kaneshiro, Takafumi Ishida, Hiroshi Ohtani, Akiomi Yoshihisa, Naoko Hijioka, Seiko Ohno, Kazuhiko Nakazato, Osamu Suzuki, Shohei Ichimura, Tetsuro Yokokawa, and Yasuchika Takeishi
- Subjects
Proband ,lcsh:Diseases of the circulatory (Cardiovascular) system ,medicine.medical_specialty ,congenital, hereditary, and neonatal diseases and abnormalities ,Nonsense mutation ,Dilated cardiomyopathy ,030204 cardiovascular system & hematology ,Sudden cardiac death ,LMNA ,03 medical and health sciences ,0302 clinical medicine ,Internal medicine ,Case report ,Medicine ,cardiovascular diseases ,030304 developmental biology ,0303 health sciences ,Lamin A/C ,Ejection fraction ,business.industry ,Atrial fibrillation ,medicine.disease ,lcsh:RC666-701 ,Heart failure ,Cardiology ,cardiovascular system ,+T%22">c.475G > T ,Cardiology and Cardiovascular Medicine ,business ,p.E159 - Abstract
Background Patients with some mutations in the lamin A/C (LMNA) gene are characterized by the presence of dilated cardiomyopathy (DCM), conduction abnormalities, ventricular tachyarrhythmias (VT), and sudden cardiac death (SCD). Various clinical features have been observed among patients who have the same LMNA mutation. Here, we show a family with cardiac laminopathy with a c.475G > T, p.E159* LMNA mutation, and a family history of conduction disorder, DCM, VT, and SCD. Case presentation A proband (female) with atrial fibrillation and bradycardia was implanted with a pacemaker in her fifties. Twenty years later, she experienced a loss of consciousness due to polymorphic VT. She had a serious family history; her mother and elder sister died suddenly in their fifties and sixties, respectively, and her nephew and son were diagnosed as having DCM. Genetic screening of the proband, her son, and nephew identified a nonsense mutation (c.475G > T, p.E159*) in the LMNA gene. Although the proband’s left ventricular ejection fraction remained relatively preserved, her son and nephew’s left ventricular ejection fraction were reduced, resulting in cardiac resynchronization therapy by implantation of a defibrillator. Conclusions In this family with cardiac laminopathy with a c.475G > T, p.E159* LMNA mutation, DCM, SCD, and malignant VT occurred. Clinical manifestation of various atrial and ventricular arrhythmias and heart failure with reduced ejection fraction occurred in an age-dependent manner in all family members who had the nonsense mutation. It appears highly likely that the E159* LMNA mutation is related to various cardiac problems in the family of the current report.
- Published
- 2019
45. First-Principles Study on Hydrogen Diffusivity in BCC, FCC, and HCP Iron
- Author
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Satoshi Iikubo, Motomichi Koyama, Hiroshi Ohtani, Kenji Hirata, and Kaneaki Tsuzaki
- Subjects
010302 applied physics ,Materials science ,Condensed matter physics ,Hydrogen ,Phonon ,Metallurgy ,Metals and Alloys ,chemistry.chemical_element ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Thermal diffusivity ,01 natural sciences ,Condensed Matter::Materials Science ,Lattice constant ,chemistry ,Mechanics of Materials ,Metastability ,Lattice (order) ,0103 physical sciences ,Metallic materials ,Physics::Atomic and Molecular Clusters ,Antiferromagnetism ,0210 nano-technology - Abstract
The hydrogen diffusion behavior in BCC, FCC, and HCP iron has been investigated by means of first-principles calculations. Diffusion coefficients were estimated quantitatively from the migration energy derived by the Nudged elastic band method, and phonon calculations including the vibrations of all atoms at every stable and metastable site. Our calculations on the BCC structure show good agreement with those in the previous report. In the FCC structure as well, the calculated diffusion coefficients are in good agreement with experimental data. Our results suggest that the consideration of the antiferromagnetic state in FCC is important for the reproduction of experimental results. For the HCP structure, although there was a lack of systematic experimental results, our calculations predict that the diffusion coefficient is smaller than that in the case of the FCC sample. In the HCP lattice, there are two diffusion paths: one parallel to the c-axis and the other in the c-plane. The direction and the diffusion coefficient can be controlled by the tuning of c/a, which is the ratio of the lattice constants.
- Published
- 2018
46. Thermodynamic Stability of Mg-Based Laves Phases
- Author
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Shoya Kawano, Satoshi Iikubo, and Hiroshi Ohtani
- Subjects
Materials science ,Precipitation (chemistry) ,Mechanical Engineering ,Thermodynamics ,02 engineering and technology ,magnesium alloy ,precipitation ,Laves phase ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Mechanics of Materials ,first-principles calculations ,0103 physical sciences ,General Materials Science ,Chemical stability ,solid solution ,Magnesium alloy ,010306 general physics ,0210 nano-technology ,Solid solution - Abstract
To investigate the stability of various Mg-based Laves phases, the formation enthalpy and phonon dispersion were obtained by first-principles calculation. The calculated formation enthalpy and phonon dispersion indicate that MgX2 (X = Al, Co, Ni, Cu, Zn) and Mg2X (X = Ca, Sr, Y, Ba, La) are stable both statically and dynamically. These results are consistent with the experimental results except for MgAl2 and Mg2La. These compounds are considered to be in a metastable state in each binary system. We also used the cluster expansion method to examine the possibility of adding a third element to MgZn2. Our theoretical investigations suggest attractive interaction between Zn and a third element such as Ag, Ca, and Zr in the MgZn2 lattice. However, Ca and Zr replace a small amount of Zn in MgZn2 owing to the instability of MgCa2 and MgZr2, in agreement with the experimental result. Furthermore, it is suggested that Zr becomes stable at the Mg site in the MgZn2 lattice owing to the stability of ZrZn2.
- Published
- 2018
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47. World-Pictures and Wittgensteinian Certainty
- Author
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Hiroshi Ohtani
- Subjects
media_common.quotation_subject ,Philosophy ,05 social sciences ,06 humanities and the arts ,Certainty ,0603 philosophy, ethics and religion ,050105 experimental psychology ,Epistemology ,060302 philosophy ,0501 psychology and cognitive sciences ,Skepticism ,media_common ,Philosophical methodology - Published
- 2018
- Full Text
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48. Sm–Ti binary thermodynamic database and phase diagram
- Author
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Arkapol Saengdeejing, Abe Taichi, Ying Chen, Satoshi Sugimoto, Osamu Takeda, Hiroshi Ohtani, and Masanori Enoki
- Subjects
Work (thermodynamics) ,Materials science ,Ternary numeral system ,General Chemical Engineering ,Thermodynamics ,Binary number ,General Chemistry ,Computer Science Applications ,Gibbs free energy ,symbols.namesake ,Magnet ,symbols ,Binary system ,CALPHAD ,Phase diagram - Abstract
For the potential new permanent magnet materials, SmFe 12 -based compounds, Ti plays an important role in stabilizing the SmFe 12 -based structures. Thermodynamic properties of the systems relating to Sm–Fe–Ti ternary system become indispensable for the future development of the SmFe 12 -based magnets. In order to construct the multi-component thermodynamic database for SmFe 12 -based compounds, the thermodynamic properties and phase diagram of Sm–Ti binary system is necessary. In this work, we attempted to construct the Sm–Ti binary thermodynamic database using data obtained mainly from first-principles. First-principles calculations are performed to obtain the Gibbs energy of ordered and disordered structures within the binary system and used for parameterized the Gibbs energy descriptions of various phases in the Sm–Ti binary system through the CALPHAD methodology, the first Sm–Ti phase diagram has been calculated accordingly.
- Published
- 2021
- Full Text
- View/download PDF
49. Thermodynamic assessment of Fe–Ti–S ternary phase diagram
- Author
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Kenji Hirata, Satoshi Iikubo, Hiroshi Ohtani, and Hirokazu Fujimoto
- Subjects
General Chemical Engineering ,Thermodynamics ,02 engineering and technology ,Titanium sulfide ,01 natural sciences ,First-principles calculations ,symbols.namesake ,Phase (matter) ,0103 physical sciences ,Thermodynamic assessment ,Binary system ,CALPHAD ,Phase diagram ,010302 applied physics ,Binodal ,Ternary numeral system ,Chemistry ,General Chemistry ,021001 nanoscience & nanotechnology ,Computer Science Applications ,Gibbs free energy ,Iron sulfide ,symbols ,0210 nano-technology ,Solid solution - Abstract
A thermodynamic analysis of the Fe-Ti-S ternary system was performed by incorporating first-principles calculations into the calculation of phase diagrams (CALPHAD) method. To evaluate the Gibbs energy, the Debye-Gruneisen model was applied for some sulfides of the Ti-S binary system. In addition, the cluster expansion and cluster variation methods were used for the solid solution phases in the Ti-S binary and (Fe,Ti)S phases. The calculated Ti-S binary phase diagram showed good agreement with the experimental results. The very low solubility of the Ti solid solution in the Ti-S system, as reported by Murray, agreed well with our calculated results. A binodal phase decomposition of the liquid phase was expected in the S-rich region. The Gibbs energy curve of (Fe,Ti)S between FeS and TiS was found to be convex downward. This is characteristic of an isomorphic solid solution, attributed to the attractive interaction between Fe and Ti in (Fe,Ti)S. The vertical phase diagram between FeS and TiS, obtained using the thermodynamic database, was in good agreement with the experimental results of Mitsui et al. The solubility products of (Fe,Ti)S have been experimentally estimated previously. The calculated solubility product agreed with the experimental value of TiS.
- Published
- 2017
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50. Philosophical pictures about mathematics: Wittgenstein and contradiction
- Author
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Hiroshi Ohtani
- Subjects
Philosophy of science ,Interpretation (philosophy) ,media_common.quotation_subject ,Philosophy ,05 social sciences ,General Social Sciences ,06 humanities and the arts ,0603 philosophy, ethics and religion ,Verificationism ,050105 experimental psychology ,Epistemology ,Mathematical practice ,Philosophy of mathematics ,Argument ,060302 philosophy ,Contradiction ,0501 psychology and cognitive sciences ,Philosophical methodology ,media_common - Abstract
In the scholarship on Wittgenstein’s later philosophy of mathematics, the dominant interpretation is a theoretical one that ascribes to Wittgenstein some type of ‘ism’ such as radical verificationism or anti-realism. Essentially, he is supposed to provide a positive account of our mathematical practice based on some basic assertions. However, I claim that he should not be read in terms of any ‘ism’ but instead should be read as examining philosophical pictures in the sense of unclear conceptions. The contrast here is that basic assertions that frame philosophical ‘isms’ are propositional such that they are subject to normal argumentative evaluation, while pictures in Wittgenstein’s sense are non-propositional—they lack a clear truth condition. They, therefore, need clarification rather than argumentation. In this paper, I provide a detailed analysis of Wittgenstein’s treatment of philosophical pictures with special focus on his argument on contradiction. I begin by explaining the problem with this trend of theoretical interpretation, taking Steve Gerrard’s otherwise excellent interpretation as a representative example and pointing out why it is problematic. Next, I will argue that those problems do not arise if we take Wittgenstein’s task as the clarification of philosophical pictures. I do this, first, by explaining Wittgenstein’s method using his argument concerning the Augustinian Picture in Philosophical Investigations and then pointing out that the same method can be identified in the crucial arguments in his philosophy of mathematics. Finally, in order to connect my interpretation with the current scholarship, I will explain the relation of my interpretation with those of New Wittgensteinian scholars.
- Published
- 2017
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