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Electron Holography of Advanced Nanomaterials
Shindo, D.,Park, H.S.,Kim, J.J.,Oikawa, T.,Tomita, T. Korean Society of Electron Microscopy 2006 Applied microscopy Vol.36 No.2
By utilizing a field emission gun and a biprism installed on a transmission electron microscope (TEM), electron holography is extensively carried out to visualize the electric and magnetic fields of nanomaterials. In the electric field analysis, the distribution of electric potential in a sharp tip made of W coated with $ZrO_2$ is visualized by applying the voltage to the tip. Denser contour lines due to the electric potential are observed with an increase in the bias voltage. In the magnetic field analysis by producing the strong magnetic field with a sharp magnetic needle made of a permanent magnet, the in situ experiment is carried out to investigate the magnetization of hard magnetic materials. The results of these experiments clearly demonstrate that electron holography is a promising advanced transmission electron microscopy technique to characterize the electric and magnetic properties of nanomaterials.
Tetsuya Shindo,Kohei Hashimoto,Takashi Shimizu,Naoki Itoh,Naoya Masumori 대한비뇨의학회 2015 Investigative and Clinical Urology Vol.56 No.4
Purpose: We conducted a prospective single-center study to evaluate the possibility of discontinuation of dutasteride after combination therapy with an alpha blocker for benign prostatic hyperplasia (BPH). Materials and Methods: We prospectively treated BPH patients with an alpha blocker and dutasteride (0.5 mg/d). Patients who had been treated with alpha blockers against BPH for more than 2 months were eligible, and 20 patients were included in the study. After 6 months of combination therapy, dutasteride was discontinued. Patients were followed for 12 months after cessation. Prostate volume, intraprostatic architecture determined by transrectal ultrasound, peak urinary flow rate, postvoid residual urine volume, and the serum prostate-specific antigen level were evaluated every 6 months, and the International Prostate Symptom Score and overactive bladder symptom score (OABSS) every 3 months. Patients were allowed to restart dutasteride during the follow-up period according to their desire. Results: Twelve patients (12/20, 60%) restarted the combination therapy from 6 to 12 months into the follow-up period. For patients who restarted dutasteride, the prostate volume and OABSS had increased and worsened after discontinuation, respectively. A visible transition zone with a clear border on transrectal ultrasound at baseline and regrowth of the prostate after discontinuation of dutasteride were risk factors for restarting the therapy (Mann-Whitney U test: p=0.008, p=0.017). Conclusions: Prostatic enlargement after discontinuation of dutasteride differs among patients. Rapid regrowth of the prostate leads to deterioration of storage symptoms and a tendency to restart dutasteride. Baseline intraprostatic architecture may be a predictive factor for whether the patient is a good candidate for discontinuation.
A Magnetic Amplifier using Nanocrystalline Soft Magnetic Material
Y. Shindo,T. Yoshihara,M. Otsubo,M. Sawada 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
A Magnetic Amplifier using saturable reactor with nanocrystalline soft magnetic material is presented. A method of obtaining the frequency response is presented. Experimental results show that the method is adequate and practical. Moreover it is shown that the efficiency of the Magnetic Amplifier is comparable to the switching power supply with primary control, despite the existence of additional saturable reactors.