99 research outputs found
SupplementaryMaterials – Supplemental material for Attacking science on social media: How user comments affect perceived trustworthiness and credibility
No full textSupplemental material, SupplementaryMaterials for Attacking science on social media: How user comments affect perceived trustworthiness and credibility by Lukas Gierth and Rainer Bromme in Public Understanding of Science</p
Laser-induced activation of Mg-doped GaN: quantitative characterization and analysis
No full textWe investigate the effectiveness of laser-induced treatment as compared to rapid-thermal annealing (RTA) for the activation of p-type dopant in Mg-doped GaN layers. The study is based on a wide set of analytical techniques, including resistivity measurements, atomic force microscopy, scanning emission microscopy (SEM), dynamic secondary ion mass spectroscopy (D-SIMS), time-of-flight (TOF) SIMS and energy dispersive X-ray spectroscopy (EDXS) in combination with scanning transmission electron microscopy (STEM). Samples are treated at different energy densities and in different atmospheres, to provide a comprehensive overview of the topic. The analysis is carried out on GaN-on-Si samples, to demonstrate the effectiveness of the treatment even in presence of high threading dislocation densitie
C8.4 Measurement Methods for Understanding Water Uptake Processes in Polymers
No full textS.306-307Harsh environmental conditions may cause corrosion processes in electronics. They are mainly induced by water uptake of polymer embedding, housing or molding compounds. Therefore, longtime stability of these materials is critical for many applications. This work is focusing on demonstration and discussion of suitable measurement methods to determine the water uptake of polymers. Electrochemical impedance spectroscopy (EIS) and Fourier Transform Infrared spectroscopy (FTIR) were used to investigate polymer degradation before and after multiple loading scenarios. Degradation models could have been derived from these results
Mapping of N−C bond formation from a series of crystalline peri‐substituted naphthalenes by charge density and solid‐state NMR methodologies
No full textA combination of charge density studies and solid state nuclear magnetic resonance (NMR) 1JNC coupling measurements supported by periodic density functional theory (DFT) calculations is used to characterise the transition from an n–π* interaction to bond formation between a nucleophilic nitrogen atom and an electrophilic sp2 carbon atom in a series of crystalline peri‐substituted naphthalenes. As the N⋅⋅⋅C distance reduces there is a sharp decrease in the Laplacian derived from increasing charge density between the two groups at ca. N⋅⋅⋅C = 1.8 Å, with the periodic DFT calculations predicting, and heteronuclear spin‐echo NMR measurements confirming, the 1JNC couplings of ≈3–6 Hz for long C−N bonds (1.60–1.65 Å), and 1JNC couplings of 2.1 Å
Comparative Data on the Mechanical Properties of Portland and Thermally Reactivated Cement
No full textThe dataset was created as part of a statistical investigation of the mechanical properties of reactivated cement. It contains documentation on each individual test specimen with regard to composition, age, geometry, and the mechanical properties tested. The parameters that were tested and documented are porosity, compressive strength, fracture toughness, and Vickers hardness.
Methods
The production of each individual test sample was documented. Each test sample was tested at 28 days of age. The compressive strength test was performed on a press (Walter & Bai AG). The Vickers hardness tests were performed on the surface of cubic samples in a penetration tester (Zwick), the porosity was determined according to the Archimedes principle, and the corresponding masses were documented. The fracture toughness was measured using an ARCO-CT device (Advanced Rigid Crack Opening on CT samples, Rödel & Isaia GmbH). The resulting data sets were analyzed in terms of mean value, standard deviation, and according to Weibull statistics.</p
Diffundierter Sauerstoff als dominierender flacher Akzeptor in p‐Typ Kupferiodid‐Dünnfilmen
No full text17861793Die Langzeitstabilität des optisch transparenten p-Typ-Halbleiters Kupferiodid ist eine aktuelle Herausforderung, da die elektrische Leitfähigkeit von CuI-Dünnfilmen empfindlich auf Umgebungseinflüsse reagiert. Deckschichten aus Aluminiumoxid erhöhen die Stabilität beträchtlich. Systematische Untersuchungen von Al2O3/CuI-Heterostrukturen in Abhängigkeit der N2- oder O2-Partialdrücke bei der Oxid-Abscheidung zeigen, dass die elektrische Leitfähigkeit der CuI-Filme durch die Sauerstoff-Diffusion in Al2O3 und CuI bestimmt wird. Sauerstoff scheint somit als dominierender Akzeptor in CuI zu wirken. Die Diffusion des Umgebungs-Sauerstoffs in CuI wurde mittels des 18O-Isotopes verfolgt.The long-term stability of the optically transparent p-type semiconductor copper iodide is a current challenge. The electrical conductivity of CuI thin films depends critically on the environmental impact. Al2O3 cappings enhance the stability considerably. Systematic studies on Al2O3/CuI heterostructures in dependence of the N2/O2 growth pressure show the electrical conductivity of the CuI films being determined by the oxygen diffusion through Al2O3 und CuI. Oxygen seems to be a dominating acceptor in CuI. We traced the diffusion of atmospheric oxygen into CuI with 18O isotopes.9511, Special Issue: Prof. Dr. rer. nat. Jörg Kärger zum 80. Geburtstag gewidme
Number of sick people who took drug A or B and did or did not get better.
No full textNumber of sick people who took drug A or B and did or did not get better.</p
Predicted contingency table task performance in the lobbyist source condition.
No full textHIS = Health Insurance Speaker; Shaded areas around graphs represent the standard errors of the marginal effects.</p
Logistic regression predicting contingency table task performance in the lobbyist condition (N = 107).
No full textLogistic regression predicting contingency table task performance in the lobbyist condition (N = 107).</p
- …
