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EFFECT OF Na₂O ADDITION ON MAGNETIC PROPERTIES OF SrZn₂-W TYPE HEXAGONAL FERRITE
Hiroshi Yamamoto,Hiroshi Fujii,Takayuki Mitsuoka 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
An experiment was carried out to investigate the effect of Na₂O additive on the magnetic and physical properties of SrZn₂-W type hexagonal ferrite. The specimens were prepared by the conventional manufacturing methods without atmosphere control. It was found that the magnetic properties of SrOㆍ2ZnOㆍ8Fe₂O₃ are considerably improved on adding 1.5wt% Na₂O. The optimum condition of making magnet with suitable properties are as follows : chemical analysis composition: Sr²+_(0.852)Zn²+_(l.721)Na+_(0.301)Fe²+_(0.723)Fe³+_(15.703)O_(27) ; semisintering condition: 1300℃ × 1h in air; sintering condition: 1250℃ × 0.5h in air. The magnetic properties are: Jm= 0.390 T, Jr= 0.348 T, H_(cJ)= 133.7 ㎄/m, H_(cB)= 129.7 ㎄/m, (BH)max = 21.50 kJ/㎥, Tc=371℃, H_A= 1091.5㎄/m, K_A = 2.13 × 10^5J/㎥ and n_B= 31.8 μB.
Hiroshi Yoshida,Hiroko Machida,Koji Matsuo,Yoshito Terai,Takuma Fujii,Masaki Mandai,Kei Kawana,Hiroaki Kobayashi,Mikio Mikami,Satoru Nagase 대한부인종양학회 2023 Journal of Gynecologic Oncology Vol.34 No.3
Objective: Owing to the potential benefits of minimally invasive hysterectomy for endometrial cancer, the practice pattern has recently shifted in Japan. This study examined the trends in minimally invasive surgery (MIS) in patients with endometrial cancer in Japan. Methods: This retrospective observational study examined the Japan Society of Obstetrics and Gynecology Tumor Registry database between 2015–2019. This study examined the time-specific proportion change and predictors of MIS use in initial endometrial cancer treatment in Japan, and compared it with the use of abdominal surgery. Additionally, the association between hospital surgical treatment volume and MIS use was examined. Results: A total of 14,059 patients (26.5%) underwent minimally invasive hysterectomy, and 39,070 patients (73.5%) underwent abdominal hysterectomy in the study period. Patients who underwent MIS were more likely to be treated at high-volume centers, younger, central, or western Japan residents, registered in recent years, and had a tumor with stage I disease, type 1 histology, and less myometrial invasion (all adjusted p<0.05). The proportion of MIS treatments increased from 19.1% in 2015 to 34.3% in 2019 (p<0.001). On multivariable analysis, treatment at high-volume centers was a contributing factor for MIS (adjusted odds ratio=3.85; 95% confidence interval=3.44–4.30). MIS at high-volume centers increased significantly from 24.8% to 41.0% (p<0.001) during the study period, whereas MIS at low-volume centers remained at median 8.8%. Conclusion: MIS has increased significantly in recent years, accounting for nearly 34% of surgical management of endometrial cancer in Japan. High-volume treatment centers take the lead in performing MIS.
Diphoton resonances at the ILC
Tian, Junping,Fujii, Keisuke,Yokoya, Hiroshi American Physical Society 2016 Physical review. D Vol.94 No.9
<P>In this paper, we study the direct production of the diphoton resonance X, which was suggested by 2015 data at the LHC, in e(+)e(-) -> X gamma/XZ processes at the ILC. We derive an analytic expression for the scattering amplitudes of these processes and present a comprehensive analysis for determining the properties of X at the ILC. A realistic simulation study for e(+)e(-) -> X gamma is performed based on the full detector simulation to demonstrate the capabilities of the ILC experiment. Complementary to the searches at the LHC, prospects for the measurement of the absolute values of the production cross section are obtained for the ILC using the recoil technique without assuming decay modes of X. In addition, we studied the searches for X -> invisible and X -> b (b) over bar modes, which are challenging at the LHC, and found that these decay modes can be discovered with high significance if their branching ratios are large enough.</P>
Ischemic enteritis with intestinal stenosis
( Yorimitsu Koshikawa ),( Hiroshi Nakase ),( Minoru Matsuura ),( Takuya Yoshino ),( Yusuke Honzawa ),( Naoki Minami ),( Satoshi Yamada ),( Yumiko Yasuhara ),( Shigehiko Fujii ),( Toshihiro Kusaka ),( 대한장연구학회 2016 Intestinal Research Vol.14 No.1
A 75-year-old man was admitted to our hospital with sudden onset of vomiting and abdominal distension. The patient was taking medication for arrhythmia. Computed tomography showed stenosis of the ileum and a small bowel dilatation on the oral side from the region of stenosis. A transnasal ileus tube was placed. Enteroclysis using contrast medium revealed an approximately 6-cm afferent tubular stenosis 10 cm from the terminal ileum and thumbprinting in the proximal bowel. Transanal double-balloon enteroscopy showed a circumferential shallow ulcer with a smooth margin and edema of the surrounding mucosa. The stenosis was so extensive that we could not perform endoscopic balloon dilation therapy. During hospitalization, the patient’s nutritional status deteriorated. In response, we surgically resected the region of stenosis. Histologic examination revealed disappearance of the mucosal layer and transmural ulceration with marked fibrosis, especially in the submucosal layer. Hemosiderin staining revealed sideroferous cells in the submucosal layers. Based on the pathologic findings, the patient was diagnosed with ischemic enteritis. The patient’s postoperative course was uneventful. (Intest Res 2016;14:89-95)
Nonvolatile Thin Film Transistor Memory with Ferritin
Kazunori Ichikawa,Mami Fujii,Prakaipetch Punchaipetch,Hiroshi Yano,Tomoaki Hatayama,Takashi Fuyuki,Ichiro Yamashita,Yukiharu Uraoka 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
The low-temperature polycrystalline silicon (poly-Si) thin film transistor (LTPS-TFT) flash memory is a potential candidate as a key component of the system on panel (SOP). We have proposed the “bio-nano-process” for the fabrication of nanodots by using biotechnology. In this study, we have successfully fabricated and developed a LTPS-TFT flash memory with biomineralized inorganic nanodots for the first time. High-density homogeneous nanodots were made to adsorb on a silicon film by using ferritin protein without the use of vacuum systems at high temperature. Electron charging and discharging in the dots were clearly confirmed from the transient behavior of the transfer curve at room temperature. This fabrication technique is promising for the development of a flash memory for a SOP.
Source apportionment of ambient PM2.5 in Ho Chi Minh City, Vietnam
Ngoc Tran,Yusuke Fujii,Md Firoz Khan,To Thi Hien,Tran Hoang Minh,Hiroshi Okochi,Norimichi Takenaka 한국대기환경학회 2024 Asian Journal of Atmospheric Environment (AJAE) Vol.18 No.1
The emission sources of fine particulate matter ( PM2.5) have not yet been fully identified in Ho Chi Minh City (HCMC), Vietnam, presenting difficulties to authorities in controlling air pollution efficiently. To address this issue, this study explores the source apportionment of PM2.5 by the positive matrix factorization (PMF) model and identifies potential regional sources through the weighted concentration-weighted trajectory (WCWT) model based on the field observation data of PM2.5 in HCMC. 24-h PM2.5 samples were collected in central HCMC for a year (September 2019–August 2020). Herein, inductively coupled plasma mass spectroscopy was used to analyze trace elements, in addition to identifying PM2.5 mass and other chemical species, such as water-soluble ions and carbonaceous species, reported in our former study. The PMF results showed that PM2.5 in HCMC was dominated by anthropogenic-rich sources comprising biomass burning, coal combustion, transportation, and crustal origins (36.4% of PM2.5 mass), followed by secondary ammonium sulfate (18.4%), sea salt (13.7%), road dust (9.6%), and coal and crude oil combustion (9.4%). WCWT results suggested that the geological sources of PM2.5 were mainly from local areas and scattered to the northeast/southwest of HCMC. In addition, the long-range transport of PM2.5 from surrounding countries was revealed during the assembly restriction and lockdown period in 2020.
Sakiko Nishio,Takuma Fujii,Hiroshi Nishio,Kaori Kameyama,Miyuki Saito,Takashi Iwata,Kaneyuki Kubushiro,Daisuke Aoki 대한부인종양학회 2013 Journal of Gynecologic Oncology Vol.24 No.3
Objective: In cervical intraepithelial neoplasia (CIN), p16INK4a immunohistochemistry has been reported to be a useful diagnostic biomarker. However, limited information is available about the association between the p16INK4a immunohistochemistry and the outcomes of CIN. Here, we report p16INK4a immunohistochemistry as an effective biomarker to predict the outcomes of CIN. Methods: p16INK4a immunohistochemistry was performed in patients with CIN from January 2000 to August 2009. Among these patients, we have performed a retrospective analysis of the medical records to evaluate the outcome of CIN 1-2 and performed statistical analysis to determine the correlation between p16INK4a expression and the outcomes. We also performed HPV genotyping and analyzed the relation between the infecting human papillomavirus (HPV) genotype and the outcomes. Results: A total of 244 patients, including 82 with CIN 1, 60 with CIN 2, and 102 with CIN 3, were examined. The rate of p16INK4a overexpression increased with increasing CIN grade, 20.7% for CIN 1, 80.0% for CIN 2, and 89.2% for CIN 3, with significant differences between CIN 1 and CIN 2-3 group. In the 131 CIN 1-2 patients, the progression rate was significantly higher for the patients showing p16INK4a overexpression than for those not showing p16INK4a overexpression (p=0.005); the regression rate was also found to be significantly lower for the patients showing p16INK4a overexpression (p=0.003). High-risk HPV genotypes were detected in 73 patients (73.7%). Both progression and regression rates were not significantly different between the high-risk HPV-positive and HPV-negative groups (p=0.401 and p=0.381, respectively). Conclusion: p16INK4a overexpression was correlated with the outcome of CIN 1-2, and p16INK4a is considered to be a superior biomarker for predicting the outcome of CIN 1-2 compared with HPV genotyping.