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

Effects of Dy211 Contents on Microstructure and Mechanical Strength of Ag-Added Dy-Ba-Cu-O Bulk Superconductors

We have conducted transmission electron microscopic observations along the [001] direction of the interfaces between Y2BaCuO5 inclusions and the YBa2Cu3O7 matrix in the YBaCuO crystals fabricated by the Melt-Powder-Melt-Growth process. Amorphous layers about 1 nm in thickness are observed at some interfaces. We could not find observable crystallographic defects at the interfaces.

TEM Observation of Interfaces between Y2BaCuO5Inclusions and the YBa2Cu3O7Matrix in Melt-Powder-Melt-Growth Processed YBaCuO

The flux pinning behavior of ternary melt-processed (Nd–Eu–Gd)Ba2Cu3Oy superconductors is studied with varying defect concentrations using magnetotransport and magnetization measurements. A huge field-induced bump feature in the resistivity with increasing defect density, field-induced magnetization kink and linear voltage-current (V-I) characteristics over the whole transition temperature regime favor the phenomenon of vortex entanglement in the liquid phase. The Nd/Ba substitution sites along with the fine second-phase particles are one of the possible reasons for the vortex entanglement and these defects give rise to high critical current density and reduced dissipation at low temperature with significant enhancement in pinning.

Evidence of strong flux pinning in melt-processed ternary (Nd–Eu–Gd)Ba2Cu3Oy superconductors

Single-grain bulk Gd-Ba-Cu-O superconductors 32 mm in diameter have successfully been grown by melt-processing in air. In contrast to Sm123 and Nd123, the superconducting properties of Gd123 bulk superconductors were not degraded even when they were fabricated in air, which is attributed to the small range of Gd-Ba solid solution. The sample with the chemical composition of Ba-rich Gd123 (Gd0.95Ba2.05Cu3Oy) was also fabricated in air and exhibited superconducting properties superior to those of the sample with the stoichiometric ratio.

https://iopscience.iop.org/article/10.1088/0953-2048/13/6/309/pdf

Superconducting properties of Gd123 superconductor fabricated in air

By measuring the magnetization hysteresis, we studied the critical current density, Jc, and irreversibility fields, Hirr, of a c‐axis aligned Hg‐Ba‐Ca‐Cu‐O sample doped with Pb containing the Hg‐1223 phase as the main phase. Anisotropy in ΔM was clearly observed in two different magnetic field directions. Even though the Hg‐1223 phase contains three CuO2 sheets, the Hirr vs [1‐(T/Tc)] curve was located at roughly the same positions as those reported for the Hg‐1201 and Hg‐1212 phases, indicating that the higher Tc phase, i.e., Hg‐1223, is advantageous to the other phases in practical uses.

Masato Murakami

Papers

Effects of Dy211 Contents on Microstructure and Mechanical Strength of Ag-Added Dy-Ba-Cu-O Bulk Superconductors

TEM Observation of Interfaces between Y2BaCuO5Inclusions and the YBa2Cu3O7Matrix in Melt-Powder-Melt-Growth Processed YBaCuO

Evidence of strong flux pinning in melt-processed ternary (Nd–Eu–Gd)Ba2Cu3Oy superconductors

Superconducting properties of Gd123 superconductor fabricated in air

Irreversibility line for a Pb-doped Hg-Ba-Ca-Cu-O superconductor