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

Optimization of the binder addition methods for bulk Y-Ba-Cu-O superconductors

We have investigated the effects of Gd BaCuO Gd211 addition on the microstructure and J -B properties of 25 c . . oxygen-controlled-melt-growth OCMG -processed Nd, Eu, Gd -Ba-Cu-O system with scanning electron microscopy . . SEM , electron probe microanalysis EPMA and magnetization measurements. Compositional analyses revealed that small . RE BaCuO RE211; RE: rare earth elements particles consist mainly of Gd in the RE site, while large RE211 particles 25 contain Nd, Eu and Gd despite the fact that only Gd211 was added to the system. Both zero field and peak J increased with c

in melt-processed Nd, Eu, Gd -Ba-Cu-O

A persistent current switch (PCS) is used for superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of Y–Ba–Cu–O (YBCO) bulk as a mechanical PCS. In previous study, in order to investigate the contact characteristics of switch, 50 A current test was performed and the contact resistance between two contacts was measured by four-terminal method. As a result, it became clear that polishing and metal depositing on contact surfaces was effective methods to reduce the residual resistance. This paper focused on the greater current test (above 50 A) in order to perform more practical experiment as PCS used for SMES. In this experiment, the authors examined the characteristics to the transfer current of switch, which was not obtained by former 50 A current test. As a result, it was obtained that the transfer current had a relationship with the layer thickness of deposited Ag on contact surfaces.

Electrical contact characteristics of YBaCuO bulk

The paper provides an experimental basis for preparing large grain (Nd0.33Eu0.27Gd0.39)Ba2Cu3Oy “NEG-123”. MgO seeds proved to be efficient in controlling growth orientation when a small quantity of ZnO of around 0.035 wt.% was added to the NEG-123 matrix. A substantial reduction of liquid phase loss was observed for a proper ZnO concentration. A perfect facet line up to the bottom of the sample with c-axis reflection plane was observed after the melt-growth implying high density of the material and practically no liquid loss. The magnetization measurements suggested that the superconducting transition temperatures were not affected up to 0.035 wt.% ZnO addition. Critical current density Jc, measured at 3 T and 77 K (Ha∥c-axis), increased with increasing ZnO content up to 0.035 wt.%, where it reached maximum value of 100 kA/cm2 and decreased thereafter. The scalling analysis of the pinning force density as a function of the reduced field h = Ha/Hirr (Hirr is the irreversibility field) showed a peak at relatively high position as expected for an optimized pinning structure. The present results indicate high potential of ZnO particles for further enhancement of the material performance.

Flux pinning and superconducting properties of ZnO added (Nd,Eu,Gd)Ba2Cu3Oy

The hard X-ray Kβ″ emission line shows sensitivity with respect to a wide range of cation–ligand coordination, which we investigate in the cases of GeO2 and TiO2 on the basis of ab initio spectral calculations on amorphous and crystalline structures. In compressed amorphous GeO2, the sampling of a large number of instantaneous coordination polyhedra from an ab initio molecular dynamics trajectory reveals that the functional relation between the Kβ″ shift and coordination is close to linear between 4-fold and 7-fold coordination. A similar sensitivity of the Kβ″ emission line exists in the coordination range between six and nine of crystalline high-pressure TiO2 polymorphs. Our results demonstrate the potential of the Kβ″ emission line in research on the structure of amorphous oxide material.

https://pubs.acs.org/doi/pdf/10.1021/acs.jpclett.3c00017

Masato Murakami

Papers

Optimization of the binder addition methods for bulk Y-Ba-Cu-O superconductors

in melt-processed Nd, Eu, Gd -Ba-Cu-O

Electrical contact characteristics of YBaCuO bulk

Flux pinning and superconducting properties of ZnO added (Nd,Eu,Gd)Ba2Cu3Oy

Sensitivity of the Kβ″ X-ray Emission Line to Coordination Changes in GeO2 and TiO2