다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

2017 ESC Guidelines on the Diagnosis and Treatment of Peripheral Arterial Diseases, in collaboration with the European Society for Vascular Surgery (ESVS) : Document covering atherosclerotic disease of extracranial carotid and vertebral, mesenteric, renal, upper and lower extremity arteries

/pdf/2017-esc-guidelines-on-the-diagnosis-and-treatment-of-2vt5ciu2yn.pdf

When asked to explain the importance of the discovery of conducting polymers, I offer two basic answers: first they did not (could not?) exist, and second, that they offer a unique combination of properties not available from any other known materials. The first expresses an intellectual challenge; the second expresses a promise for utility in a wide variety of applications.

Semiconducting and Metallic Polymers: The Fourth Generation of Polymeric Materials (Nobel Lecture).

2020 ACC/AHA Guideline for the Management of Patients With Valvular Heart Disease: A Report of the American College of Cardiology/American Heart Association Joint Committee on Clinical Practice Guidelines

Welding of Y-Ba-Cu-O Bulk Superconductors Using Superconducting Er-Ba-Cu-O Solder

The results of two independent texture measurements on melt-textured Y-Ba-Cu-O (YBCO) high-Tc superconductors are compared with each other. The texture data are acquired by means of an X-ray based pole figure texture analysis and of a local texture analysis provided by an automated electron-backscatter diffraction (EBSD) or often called orientation imaging microscopy (OIM) analysis. As samples, we employ two different melt-textured YBCO samples; one fully processed (orthorhombic) and one without oxygen treatment (tetragonal). Pole figures in [103] direction are used to enable a direct comparison. We find a clear coincidence between the results obtained by the two measurement techniques on the melt-textured YBCO samples, however, the EBSD results are much more detailed, yielding the local grain orientation distribution and quantitative results of the grain or subgrain misorientation angles. Therefore, the EBSD measurements give informations which are not accessible by the X-ray texture analysis. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

OIM and X-ray texture analysis of melt-textured YBCO superconductors

Measurements of the static forces were performed for various types of superconducting magnetic bearings at liquid nitrogen temperature. It was found that the stiffness of the superconducting bearing was rather small ; however, both the electromagnetic forces and the stiffness could be increased by using a combination of a thrust and radial bearing. It was also found that the stiffness could be increased by using the attractive force due to flux pinning. Based on these measurements, a practical superconducting magnetic bearing was designed and constructed, where a 2.4 kg rotor could rotate at 33000 rpm.

Static and Dynamic Characteristics of Superconducting Magnetic Bearings Using MPMG Y-Ba-Cu-O

Strong magnetic fields can be generated for magnetization of the high-Tc superconductor (HTS) with pulsed magnetic fields using a small exciting coil. In the present study, magnetization using the pulsed magnetic field is performed on HTS bulk samples in the zero-field cooled state. In order to saturate the magnetization, it was necessary to optimize the time constant of the magnetic flux invasion and the flux flow during the increasing and decreasing processes of the pulsed magnetic field. Therefore, we measured the magnetic flux density on the pulsed field magnetization process and explained the relation between the pulsed magnetic field and the time constant of the magnetic flux invasion and flux flow. An empirical model of the pulsed field magnetization process was also proposed and optimum conditions were studied for pulsed field magnetization of the HTS. From this study, it was confirmed that an optimum pulsed waveform existed for pulsed field magnetization.

Examination of Optimized Pulsed Field Magnetization for a YBCO Bulk Superconductor on Pulsed Field Magnetization Process

We report on the flux pinning and optimization of melt-processed ternary (Nd-Eu-Gd)Ba/sub 2/Cu/sub 37-x/ bulk materials using magnetization and magneto-transport (quasi-flux transformer technique) measurements. The highest flux pinning was observed for the optimal annealing condition, where twin planes act as correlated pinning in the presence of the optimal second-phase addition. The addition of Ag decreases the low-field critical current density, whereas high-field behavior does not change drastically. The results were compared with NdBa/sub 2/Cu/sub 3/O/sub 7-x/ single crystals that show various vortex states with increasing defect density. The melt-processed samples demonstrate very similar behavior to the single crystal. The interplay between the point defect and the twin planes resulting an entangled vortex liquid-state remains valid for both single crystals and melt-processed samples.

Masato Murakami

Papers

Welding of Y-Ba-Cu-O Bulk Superconductors Using Superconducting Er-Ba-Cu-O Solder

OIM and X-ray texture analysis of melt-textured YBCO superconductors

Static and Dynamic Characteristics of Superconducting Magnetic Bearings Using MPMG Y-Ba-Cu-O

Examination of Optimized Pulsed Field Magnetization for a YBCO Bulk Superconductor on Pulsed Field Magnetization Process

Flux pinning in melt-processed ternary (Nd-Eu-Gd) and Nd-based superconductors