Journal Article

 2017-08-1710:05 [FZJ-2017-06004] Journal Article et al Material Properties and Their Influence on the Behaviour of Tungsten as Plasma Facing Material Nuclear fusion 57(6), 066018 - (2017) [10.1088/1741-4326/aa6938] With the aim of a possible improvement of the material specification for tungsten, five different tungsten products by different companies and by different production technologies (forging and rolling) are subject to a materials characterization program. Tungsten produced by forging results in an uniaxial elongated grain shape while rolled products have a plate like grain shape which has an influence on the mechanical properties of the material. [...] Fulltext: PDF PDF (PDFA); 2017-08-1710:03 [FZJ-2017-06003] Journal Article et al Semiconductor-to-Metal Transition and Quasiparticle Renormalization in Doped Graphene Nanoribbons2 Advanced electronic materials 3(4), 1600490 (2017) [10.1002/aelm.201600490] A semiconductor-to-metal transition in N = 7 armchair graphene nanoribbons causes drastic changes in its electron and phonon system. By using angle-resolved photoemission spectroscopy of lithium-doped graphene nanoribbons, a quasiparticle band gap renormalization from 2.4 to 2.1 eV is observed. [...] Fulltext: PDF PDF (PDFA); 2017-08-1709:59 [FZJ-2017-06001] Journal Article et al TEM Analysis of Recrystallized DoubleFforged Tungsten After Exposure in JUDITH 1 and JUDITH 2 Nuclear materials and energy 9, 484 - 489 (2016) [10.1016/j.nme.2016.04.003] Five samples of recrystallized pure tungsten were exposed to transient heat loads using the electron beam of the JUDITH 1 and JUDITH 2 installations of Forschungszentrum Jülich. The heat flux and base temperature were the same for all samples; only the number of pulses and exposure device differed. [...] OpenAccess: PDF PDF (PDFA); 2017-08-1709:56 [FZJ-2017-06000] Journal Article et al Use of Tungsten Material for the ITER Divertor Nuclear materials and energy 9, 616 - 622 (2016) [10.1016/j.nme.2016.07.003] Since the ITER divertor design includes tungsten monoblocks in the vertical target where heat loads are maximal, the design to protect leading edges as well as technology R&D for high performance armor-heat sink joint were necessary to be implemented. In the R&D, the availability of the technology was demonstrated by high heat flux test of tungsten monoblock components. [...] OpenAccess: PDF PDF (PDFA); 2017-08-1709:43 [FZJ-2017-05997] Journal Article et al Creating anisotropic spin-split surface states in momentum space by molecular adsorption Physical review / B 96(8), 085403 (2017) [10.1103/PhysRevB.96.085403] In this ab initio study we demonstrate that molecular adsorption on a surface Rashba system can be used to modulate the surface electronic structure in different momentum space directions, i.e., to create anisotropic spin splittings in k space. This effect is rooted in the asymmetric adsorption of the molecules on the surface in a hollow site which breaks the surface symmetry. [...] OpenAccess: PDF PDF (PDFA); 2017-08-1709:41 [FZJ-2017-05995] Journal Article et al On-Surface Synthesis of Sandwich Molecular Nanowires on Graphene Journal of the American Chemical Society 139(29), 9895 - 9900 (2017) [10.1021/jacs.7b03381]   We demonstrate a new synthesis route for the growth of organometallic sandwich molecular nanowires, taking the example of Eu-cyclooctatetraene (EuCot), a predicted ferromagnetic semiconductor. We employ simultaneous exposure of Cot molecules and Eu vapor in ultrahigh vacuum to an inert substrate, such as graphene. [...] Fulltext: PDF PDF (PDFA); 2017-08-1708:50 [FZJ-2017-05979] Journal Article et al Comparison of Microstructure and Adhesion Strength of Plasma, Flame and High Velocity Oxy-Fuel Sprayed CoatingsFfrom an Iron Aluminide Powder Surface and coatings technology 324, 498 - 508 (2017) [10.1016/j.surfcoat.2017.06.016] In this study an iron aluminide powder with the feedstock powder composition of Fe-28Al-5Cr and a particle size of 45 μm to 75 μm was thermally sprayed onto AlSi10Mg and AlSi12CuNiMg substrates by flame spray (FS), atmospheric plasma spray (APS) and high velocity oxy-fuel spray (HVOF) processes. The combination of the utilized materials is due to lightweight design and is, therefore, different from most of the previous studies, which dealt with the application of iron aluminide coatings onto steels. [...] Fulltext: PDF PDF (PDFA); 2017-08-1708:48 [FZJ-2017-05978] Journal Article et al Rate Dependent Tension-Compression-Asymmetry of Ti-61.8at%Al Alloy with Long Period Superstructures at 1050 °C Materials science and engineering / A 700, 503 - 511 (2017) [10.1016/j.msea.2017.06.041] Al-rich TiAl alloy system has recently become a focus of interest due to its higher oxidation resistance, 20% lower density and higher (200 °C more) operating temperature application possibility over conventional Ti-rich TiAl alloys. Tension-compression asymmetry of such type of high temperature material is an integral part of modern engineering problems. [...] Fulltext: PDF PDF (PDFA); 2017-08-1708:21 [FZJ-2017-05975] Journal Article et al O-(2-[$^{18}$F]fluoroethyl)-l-tyrosine PET in gliomas: influence of data processing in different centres EJNMMI Research 7(1), 64 (2017) [10.1186/s13550-017-0316-x] BackgroundPET using O-(2-[18F]fluoroethyl)-l-tyrosine (18F-FET) is an established method for brain tumour diagnostics, but data processing varies in different centres. This study analyses the influence of methodological differences between two centres for tumour characterization with 18F-FET PET using the same PET scanner.Methodological differences between centres A and B in the evaluation of 18F-FET PET data were identified for (1) framing of PET dynamic data, (2) data reconstruction, (3) cut-off values for tumour delineation to determine tumour-to-brain ratios (TBR) and tumour volume (Tvol) and (4) ROI definition to determine time activity curves (TACs) in the tumour. [...] OpenAccess: PDF PDF (PDFA); 2017-08-1615:30 [FZJ-2017-05969] Journal Article et al Pyroglutamate-modified Aβ(3-42) affects aggregation kinetics of Aβ(1-42) by accelerating primary and secondary pathways Chemical science 8(7), 4996 - 5004 (2017) [10.1039/C6SC04797A]   The aggregation into amyloid fibrils of amyloid-β (Aβ) peptides is a hallmark of Alzheimer's disease. A variety of Aβ peptides have been discovered in vivo, with pyroglutamate-modified Aβ (pEAβ) forming a significant proportion. [...] OpenAccess: PDF PDF (PDFA);