Abstract
We report on an experiment conducted at the ESR storage ring aiming at the study of the X-ray emission of
$$\text {Xe}^{54+}$$
Xe
54
+
ions colliding with Xe atoms at a beam energy of ...50 MeV/u. The radiation resulting from the ion–atom interaction was observed using a high-resolution spectrometer based on metallic–magnetic calorimeter technology. In order to benchmark the capabilities of these detectors for high-precision atomic physics experiments, we identified several transitions from H-like and He-like xenon and determined their energies. Furthermore, the 1
s
-Lamb shift in
$$\text {Xe}^{53+}$$
Xe
53
+
was estimated using the measured line energies. The results are compared with previous experimental studies and theoretical predictions.
Graphicalabstract
We report on an experiment conducted at the ESR storage ring aiming at the study of the X-ray emission of
Xe
54
+
ions colliding with Xe atoms at a beam energy of 50 MeV/u. The radiation resulting ...from the ion–atom interaction was observed using a high-resolution spectrometer based on metallic–magnetic calorimeter technology. In order to benchmark the capabilities of these detectors for high-precision atomic physics experiments, we identified several transitions from H-like and He-like xenon and determined their energies. Furthermore, the 1
s
-Lamb shift in
Xe
53
+
was estimated using the measured line energies. The results are compared with previous experimental studies and theoretical predictions.
Graphicalabstract
We present the synthesis of Bi1–x Sb x nanowires with controlled composition between x = 0.05 and x = 0.40 over a wide range of diameters (20–100 nm) interesting for the investigation of the ...enhancement of thermoelectric efficiency via quantum size effects. We find that the relative concentration of Bi and Sb ions in the electrolyte, together with the deposition potential, determines the resulting nanowire composition. Morphology and composition were analyzed using X-ray diffraction, electron microscopy, and energy dispersive X-ray analysis. Two different templates were fabricated to enable the synthesis of nanowires with smooth and rough contour.
The nature of dielectric echoes in amorphous solids at low temperatures is investigated. It is shown that at long delay times the echo amplitude is determined by a small subset of two level systems ...(TLS) having negligible relaxation and decoherence because of their weak coupling to phonons. The echo decay can then be described approximately by power law time dependencies with different powers at times longer and shorter than the typical TLS relaxation time. The theory is applied to recent measurements of two and three pulse dipolar echo in borosilicate glass BK7 and provides a perfect data fit in the broad time and temperature ranges under the assumption that there exist two TLS relaxation mechanisms due to TLS-phonons and TLS-TLS interaction. This interpretation is consistent with the previous experimental and theoretical investigations. Further experiments verifying the theory predictions are suggested.
Propofol dependency Soyka, Michael; Schotz, Christian G.
Addiction (Abingdon, England),
10/1997, Letnik:
92, Številka:
10
Journal Article
Recenzirano
Odprti dostop
Soyka and Schutz describe a case study in which a man admitted to their hospital was addicted to propofol, a short-acting general hypnotic usually used in combination with other drugs. They feel the ...inclusion of propofol in the access restricted system does not seem necessary at this time.
The social costs of tropical cyclones Krichene, Hazem; Vogt, Thomas; Piontek, Franziska ...
Nature communications,
11/2023, Letnik:
14, Številka:
1
Journal Article
Recenzirano
Odprti dostop
Abstract
Tropical cyclones (TCs) can adversely affect economic development for more than a decade. Yet, these long-term effects are not accounted for in current estimates of the social cost of carbon ...(SCC), a key metric informing climate policy on the societal costs of greenhouse gas emissions. We here derive temperature-dependent damage functions for 41 TC-affected countries to quantify the country-level SCC induced by the persistent growth effects of damaging TCs. We find that accounting for TC impacts substantially increases the global SCC by more than 20%; median global SCC increases from US$ 173 to US$ 212 per tonne of CO
2
under a middle-of-the-road future emission and socioeconomic development scenario. This increase is mainly driven by the strongly TC-affected major greenhouse gas emitting countries India, USA, China, Taiwan, and Japan. This suggests that the benefits of climate policies could currently be substantially underestimated. Adequately accounting for the damages of extreme weather events in policy evaluation may therefore help to prevent a critical lack of climate action.
In order to move from a carbon-based energy system to a more sustainable one, focus is put on liquid organic hydrogen carrier (LOHC) systems for CO2-free hydrogen storage and release. In this study ...sulfur as a dopant for the Pt/TiO2 catalyst was identified to be a selective poison resulting in high performing catalysts in the dehydrogenation experiments with the LOHC system perhydro dibenzyltoluene/dibenzyltoluene (H18-DBT/H0-DBT). The Pt/TiO2 and S–Pt/TiO2 catalysts were compared to the current benchmarks Pt/γ-Al2O3 and S–Pt/γ-Al2O3. S–Pt/TiO2 was found to achieve a high degree of dehydrogenation of 98% which is competitive to the benchmark S–Pt/γ-Al2O3. In addition, analyses of the side products resulted in a higher selectivity toward dibenzyltoluene for S–Pt/TiO2 than for the γ-Al2O3 supported catalysts. Characterization with infrared spectroscopy (IR), transmission electron microscopy (TEM), and diffuse reflectance infrared Fourier transform spectroscopy with CO as adsorbing molecule (CO–DRIFTS) suggest the presence of strongly chemisorbed sulfur species as well as SMSI effects of the Pt/TiO2 catalysts. Based on kinetic studies, a batch and plug flow reactor for the dehydrogenation reaction were simulated for both titania supported catalysts. According to the calculations, the sulfur doped catalyst displays higher conversions in both batch and plug flow operation as compared to the unmodified system Pt/TiO2.
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