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

Deposits of clastic carbonate-dominated (calciclastic) sedimentary slope systems in the rock record have been identified mostly as linearly-consistent carbonate apron deposits, even though most ancient clastic carbonate slope deposits fit the submarine fan systems better. Calciclastic submarine fans are consequently rarely described and are poorly understood. Subsequently, very little is known especially in mud-dominated calciclastic submarine fan systems. Presented in this study are a sedimentological core and petrographic characterisation of samples from eleven boreholes from the Lower Carboniferous of Bowland Basin (Northwest England) that reveals a >250 m thick calciturbidite complex deposited in a calciclastic submarine fan setting. Seven facies are recognised from core and thin section characterisation and are grouped into three carbonate turbidite sequences. They include: 1) Calciturbidites, comprising mostly of highto low-density, wavy-laminated bioclast-rich facies; 2) low-density densite mudstones which are characterised by planar laminated and unlaminated muddominated facies; and 3) Calcidebrites which are muddy or hyper-concentrated debrisflow deposits occurring as poorly-sorted, chaotic, mud-supported floatstones. These

Phd by thesis

https://dc.engconfintl.org/cgi/viewcontent.cgi?article=1032&context=superalloys_ii

A critical review of high entropy alloys and related concepts

Microstructures and properties of high-entropy alloys

The lithium metal battery is strongly considered to be one of the most promising candidates for high-energy-density energy storage devices in our modern and technology-based society. However, uncontrollable lithium dendrite growth induces poor cycling efficiency and severe safety concerns, dragging lithium metal batteries out of practical applications. This review presents a comprehensive overview of the lithium metal anode and its dendritic lithium growth. First, the working principles and technical challenges of a lithium metal anode are underscored. Specific attention is paid to the mechanistic understandings and quantitative models for solid electrolyte interphase (SEI) formation, lithium dendrite nucleation, and growth. On the basis of previous theoretical understanding and analysis, recently proposed strategies to suppress dendrite growth of lithium metal anode and some other metal anodes are reviewed. A section dedicated to the potential of full-cell lithium metal batteries for practical applicatio...

Toward Safe Lithium Metal Anode in Rechargeable Batteries: A Review.

There are a number of interesting phenomena related to impurity scattering in ferromagnetic alloys for which up to now no description from first-principles is available. One of these is the spontaneous magnetoresistance anisotropy (SMA) which occurs in principle in any ferromagnetic alloy and expresses the fact that the spontaneous magnetization reduces the symmetry of a crystalline system and leads to an electrical conductivity which depends on the relative orientation of the current and the magnetic field.

Calculation of Spontaneous Resistance Anisotropy of Disordered Ferromagnetic Alloys

Kurzfassung Die Eigenspannungen im Inneren eines mechanischen Bauteils sichtbar zu machen oder die verborgene innere Struktur eines Objekts auf den Mikrometer genau zu studieren, sind nur zwei Beispiele fur den Einsatz zerstorungsfreier Messmethoden am Hahn-Meitner-Institut (HMI) in Berlin. An dieser Stelle sollen einige der wichtigsten davon sowie ihre Anwendungsfelder vorgestellt werden.

Zerstörungsfreie Messmethoden am Hahn-Meitner-Institut: Neutronen, Ionen und Röntgenstrahlen für die Industrie

The new science of metallic foams is growing rapidly, in both the scientific research community and in industrial applications. Several methods now exist for foaming metals. One of these was invented a few years ago at the Fraunhofer-Institute in Bremen [1, 2]. The foam is fabricated from a metal powder, often aluminium, which is mixed with a blowing agent that is chosen to release gas close to the melting point of the metal, e.g. 99.5% aluminium powder and 0.5% titanium hydride powder. This powder mixture is processed to give a dense precursor material which is then heated up to the melting point of the metal. As the metal starts to melt, the blowing agent releases gas and the mixture expands. The resulting foam is then cooled to freeze the structure, resulting in a solid foam. Figure 1 shows an example of such a foam, which can easily be fabricated inside a mould, leading to the possibility of reduced post-processing. After the expansion phase therefore, the foamed liquid metal undergoes simultaneous liquid drainage and cooling. The liquid drainage, due to gravity, introduces inhomogeneity into the structure, which is generally undesirable in view of the uniform properties required in the solidified structure. If it continues for too long, rupture and collapse of the bubbles will occur. These mechanisms are prevented if the freezing process is rapid enough. Freezing fronts move inwards through the sample, arresting the drainage process. In the model described below we estimate their velocity in relation to the velocity of drainage. Figure 1 shows that uniform foams can currently be fabricated. We wish to define the physical and material parameters which will allow other materials to be foamed with this process.

Methods and models of metallic foam fabrication

The aim of this work is to clarify the difference in anisotropic precipitate growth in an Al-Mg-Si single crystal during artificial ageing (AA) after different natural pre-ageing (NA) conditions. In one experimental series, in-situ small angle neutron scattering (SANS) experiments were performed at 180°C right after solution heat treatment and quenching. In another series, the crystal was first naturally aged at ‘room temperature’ for 1 week before AA, after which SANS experiment was carried out. The measurements were performed at D22 of the Institut Laue-Langevin with the single crystal mounted so that the neutron beam was parallel to one of the {001}Al directions. Anisotropic scattering from the needle-like precipitates growing along {001}Al was observed. The size evolution of the precipitates is compared for the crystal aged with and without NA. For this crystal without NA, the length of the precipitates increases significantly in the first 2h of AA. After this both the length and radius increase with AA time. With NA before AA, the number density of the precipitates is lower comparing to the directly AA crystal. The rate of increase in length of s” is lower and the mean size of β” is smaller.

Investigations on the Precipitation in Monocrystalline Al-Mg-Si Model Alloy by Small Angle Neutron Scattering

Forscher des Helmholtz-Zentrums Berlin fur Materialien und Energie (ehemals Hahn-Meitner-Institut Berlin) haben eine Methode entwickelt, mit der es moglich ist, Magnetfelder im Inneren von massiven, nichttransparenten Materialien zwei- und dreidimensional sichtbar zu machen. Dazu wurden die besonderen Eigenschaften von spinpolarisierten Neutronen genutzt, die in vielen Materialien eine hohe Eindringtiefe haben und ein magnetisches Moment besitzen.

John Banhart

Papers

Calculation of Spontaneous Resistance Anisotropy of Disordered Ferromagnetic Alloys

Zerstörungsfreie Messmethoden am Hahn-Meitner-Institut: Neutronen, Ionen und Röntgenstrahlen für die Industrie

Methods and models of metallic foam fabrication

Investigations on the Precipitation in Monocrystalline Al-Mg-Si Model Alloy by Small Angle Neutron Scattering

Einblicke in Magnetfelder