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Green upconversion luminescence and temperature sensitivity of LaOF:Yb,Ho phosphors
Nonaka T.,Sugiura T.,Tsukamoto T.,Yamamoto S. I. 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6
The aim of this study is to synthesize green upconversion phosphors by introducing Yb and Ho into LaOF. Furthermore, we aim to use the obtained LaOF:Yb,Ho devices as temperature sensors. The results of the X-ray diff raction measurements showed that Tetragonal LaOF and Hexagonal LaF 3 were detected in the samples that were sintered for 1 h. The photolumi- nescence characteristics were analyzed under excitation at a wavelength of 980 nm, and a strong emission was observed at a wavelength of 543 nm ( 5F 4, 5S 2 → 5I8). The temperature sensor was found to be stable. Furthermore, the sample showed a relative sensitivity of around 0.004 K −1 regardless of the temperature.
Abusive Head Trauma in Infants and Children in Japan
Nonaka, Masahiro,Asai, Akio The Korean Neurosurgical Society 2022 Journal of Korean neurosurgical society Vol.65 No.3
Subdural hematoma in infants can be caused by abuse, and is thought to be more likely if subdural hematoma is associated with retinal hemorrhage and cerebral edema. In Japan, few doctors disagree that cases of subdural hematoma with retinal hemorrhage and cerebral edema with multiple findings on the body are more likely to have been caused by abuse rather than by household accident. On the other hand, in cases where there are no other significant physical findings, only subdural hematoma and retinal hemorrhage, there is a difference of opinion as to whether the injury was caused by an accident or abuse. The reason for this is that neurosurgeons in Japan promoted the concept that infants can develop subdural hematomas and retinal hemorrages due to minor trauma at home before the concept of abusive head trauma became known. In addition, the age distribution of subdural hematomas in Japan differs from that in other countries, with peaks at around 8 months, and the reason for this remains unclear. Therefore, the etiology of infant subdural hematoma in Japan needs to be investigated in greater detail.
Yoshihiro Nonaka,Kenichiro Takeda,Hiroshi Nakane,Takao Maeda 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Simultaneous measuring system for permeability and resistivity of magnetic sheets is presented. In this system, the coil impedance is measured when a specimen is inserted between two coils. This system was applied to nickel sheets, iron-nickel alloys and a nickel thin film.
Measuring the Quality of Life for Individuals With Prolonged Social Withdrawal (Hikikomori)
Shunsuke Nonaka,Motohiro Sakai 대한신경정신의학회 2022 PSYCHIATRY INVESTIGATION Vol.19 No.5
Objective This study aimed to develop a quality of life scale for hikikomori (QOL-H), measuring the subjective quality of life (QOL) of individuals with hikikomori, and confirming its reliability and validity.Methods The characteristics of the scale were examined using item response theory. Data were collected from 99 people with hikikomori, 100 people who had experienced hikikomori in the past, and 198 people who had not experienced hikikomori, to develop the scale, examine its reliability, validity, and characteristics. For convergent validity, the correlation coefficients between QOL-H and social interaction behaviors, hikikomori characteristics, depressive symptoms, subjective happiness, and difficulty in social participation were calculated.Results Good internal consistency, test-retest reliability, and convergent validity were confirmed for the QOL-H. Furthermore, significant differences in scores among all groups confirmed adequate criterion-related validity. Total information function indicated a high measurement accuracy when QOL was average or slightly high.Conclusion This study suggests that QOL-H can be an appropriate measure of QOL for individuals with hikikomori.
PWM CURRENT SOURCE CONVERTER AND INVERTER
SAKUTARO NONAKA 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
Recent progress made by turn off power semiconductor devices has been contributing to simplification of circuit arrangement in power electronic equipment This paper summaries important development in power devices and describes novel industrial applications of these semiconductor devices in voltage source and current source converter and inverter.
( Takashi Nonaka ),( Takaomi Kessoku ),( Yuji Ogawa ),( Kento Imajyo ),( Shogo Yanagisawa ),( Tadahiko Shiba ),( Takashi Sakaguchi ),( Kazuhiro Atsukawa ),( Hisao Takahashi ),( Yusuke Sekino ),( Eiji 대한소화기기능성질환·운동학회 2011 Journal of Neurogastroenterology and Motility (JNM Vol.17 No.3
Background/Aims The effects of Histamine-2 receptor antagonists and proton pump inhibitors on the gastrointestinal motility have not yet been sufficiently investigated. The aim of this study was to determine the effects of intravenous bolus administration of famotidine and omeprazole on the rate of gastric emptying using the continuous 13C breath test (BreathID system, Exalenz Bioscience Ltd, Israel). Methods Twelve healthy male volunteers participated in this randomized, 3-way crossover study. After fasting overnight, the subjects were randomly assigned to receive 20 mg of famotidine, 20 mg of omeprazole or 20 mL of saline alone by intravenous bolus injection before a test meal (200 kcal per 200 mL, containing 100 mg of 13C-acetate). Gastric emptying was monitored for 4 hours after the ingestion of test meal by the 13C-acetic acid breath test performed using the BreathID system. Results No significant differences in the calculated parameters, namely, the T1/2, Tlag, GEC, β and κ, were observed among the 3 test conditions. Conclusions The study revealed that intravenous administration of gastric acid suppressant drugs had no significant influence on the rate of gastric emptying in comparison with that of saline alone as a placebo. Our results indicating the absence of any effect of either famotidine or omeprazole on accelerating the rate of gastric emptying suggest that both medications can be administered safely to patients suffering from hemorrhagic peptic ulcers who need to be kept nil by mouth from the viewpoint of possible acceleration of gastrointestinal motility in the clinical setting.