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Zeigen, nicht erklären!
(2020)
Medien sind während der Covid-Pandemie in besonderem Maße gefordert, komplexe Sachverhalte, wie Inzidenzen und exponentielles Wachstum einfach zu erklären. Informationsgrafiken sind dazu bestens geeignet, erfordern allerdings hohe Kompetenz in der Erstellung. Dieser Artikel plädiert für die Einführung eines eigenen journalistischen Genres, nämlich des visuellen Journalismus.
X-ray microtomography is a nondestructive, three-dimensional inspection technique applied across a vast range of fields and disciplines, ranging from research to industrial, encompassing engineering, biology, and medical research. Phasecontrast imaging extends the domain of application of x-ray microtomography to classes of samples that exhibit weak attenuation, thus appearing with poor contrast in standard x-ray imaging. Notable examples are low-atomic-number materials, like carbon-fiber composites, soft matter, and biological soft tissues.We report on a compact and cost-effective system for x-ray phase-contrast microtomography. The system features high sensitivity to phase gradients and high resolution, requires a low-power sealed x-ray tube, a single optical element, and fits in a small footprint. It is compatible with standard x-ray detector technologies: in our experiments, we have observed that single-photon counting offered higher angular sensitivity, whereas flat panels provided a larger field of view. The system is benchmarked against knownmaterial phantoms, and its potential for soft-tissue three-dimensional imaging is demonstrated on small-animal organs: a piglet esophagus and a rat heart.We believe that the simplicity of the setupwe are proposing, combined with its robustness and sensitivity, will facilitate accessing quantitative x-ray phase-contrast microtomography as a research tool across disciplines, including tissue engineering, materials science, and nondestructive testing in general.
X-ray micro tomography of three-dimensional embroidered current collectors for lithium-ion batteries
(2016)
Wirtschaftsethik
(2020)
Wirtschaftliche und ethische Handlungen sind zugleich realisierbar, wenn zwischen einer einrahmenden Wirtschaftsordnung (Spielregeln) und einzelnen Handlungen (Spielzügen) unterschieden wird. Das wirtschaftliche Tun und Unterlassen wird dann in den Spielzügen und die Ethik über die Spielregeln realisierbar. Die Gültigkeit einer Wirtschaftsordnung setzt einen allgemeinen Konsens über die Spielregeln und die Durchsetzungsinstanzen (z. B: Justiz oder Kartellamt) voraus. Dann regelt sie den Wettbewerb und nötigt Anbieter, sich an den Interessen der Nachfrager zu orientieren und dabei auf einen effizienten Ressourceneinsatz zu achten. So erfolgt das individuelle Handeln der Marktteilnehmer in der einrahmenden Wirtschaftsordnung mit den darin befindlichen Anreizen, daher spricht man von einer Anreizethik. Mit ihr werden wirtschaftliche und ethische Handlungen zugleich realisierbar.
In this paper, low-loss Y-branch splitters up to 128 splitting ratio are designed, simulated, and optimized by using 2D beam propagation method in OptiBPM tool by Optiwave. For an optical waveguide, a silica-on-silicon material platform is used. The splitters were designed as a planar structure for a telecommunication operating wavelength of 1.55 m. According to the minimum insertion loss and minimum non-uniformity, the optimum length for each Y-branch is determined. The influence of the pre-defined S-Bend waveguide shapes (Arc, Cosine, Sine) and of the waveguide core size reduction on the splitter performance has been also studied. The obtained simulation results of all designed splitters with different S-Bend shape waveguides together with the different waveguide core sizes are discussed and compared with each other.
Greater specific energy densities in lithium-ion batteries can be achieved by using three-dimensional (3D) porous current collectors, which allow for greater areal mass loadings of the electroactive material. In this paper, we present the use of embroidered current collectors for the preparation of thick, pouch-type Li-ion batteries. Experiments were performed on LiFePO 4 (LFP) water-based slurries using styrene-butadiene rubber (SBR) as binder and sodium carboxymethyl cellulose (CMC) as thickener, and formulations of different rheological characteristics were investigated. The electrochemical performance (cyclic voltammetry, rate capability) and morphological characteristics of the LFP half-pouch cells (X-ray micro computed tomography and scanning electron microscopy) were compared between the formulations. An optimum electrode formulation was identified, and a mechanism is proposed to explain differences between the formulations. With the optimum electrode formulation, 350 µm casted electrodes with high mechanical stability were achieved. Electrodes exhibited 4–6 times greater areal mass loadings (4–6 mAh cm −2 ) and 50% greater electroactive material weight than with foils. In tests of half- and full-pouch embroidered cells, a 50% capacity utilization at 1C-rate and 11% at 2C-rate were observed, with a full recovery at C/5-rate. The cycling stability was also maintained over 55 cycles.
Was Kennzahlen aussagen
(2021)
Was ist als Ergebnis der Operation 1 : 2 als „korrekt“ anzuerkennen? In der Menge der natürlichen Zahlen N ist 0 korrekt, in der Menge der rationalen Zahlen Q ist 0,5 richtig. Was „wahr“ ist, hängt also von den Ermittlungs- und Berechnungsgrundlagen ab. Das übersehen viele Führungskräfte beim Umgang mit Kennzahlen genau so, wie die Bedeutung ihrer kommunikativen Kompetenzen.
Wahrheit braucht Vertrauen
(2022)