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Development of a Microwave SQUID Multiplexer for Magnetic Microbolometers
No full textThe search for primordial B-modes in the cosmic microwave background (CMB) requires highly sensitive and scalable detector systems. The magnetic microbolometer (MMB) is an emerging detector concept that exploits the magnetic properties of paramagnetic materials at sub-kelvin temperatures, offering bolometers with a high dynamic range and low intrinsic noise. In recent years, the microwave SQUID multiplexer (μMUX) has become a key technology to efficiently read large low-temperature detector arrays, enabling the readout of hundreds to thousands of detectors over a single transmission line with low noise and minimal power dissipation while reducing the cryogenic setup complexity. In this work, we report the design, fabrication and characterization of a μMUX optimized for MMB detectors and share our latest experimental results from a bolometer prototype. These findings provide valuable insight of the μMUX in advancing next-generation CMB instrumentation and also demonstrate its suitability for novel detector technologies such as the MMB
Beyond the cross‐section: Rethinking the intention–behaviour gap through a conceptual and methodological lens
No full textObjectives
The intention–behaviour gap (IBG) remains a persistent challenge in health psychology. While intentions are widely recognized as proximal determinants of behaviour, they frequently fail to translate into action. This conceptual review aims to critically evaluate dominant models of the IBG and propose a dynamic, multidimensional reconceptualization of intention–behaviour processes.
Methods
This conceptual review critically evaluates dominant models of the IBG–the Explained Variance Approach and the Action Control Framework. Special emphasis is placed on methodological constraints associated with between-person research designs, which inadequately capture the temporal and contextual variability of behavioural enactment.
Results
Theoretical and empirical limitations are identified in existing IBG models, including their failure to address intra-individual fluctuations, situational contingencies and the time-indexed nature of behavioural regulation. In response, we propose a framework emphasizing intensive longitudinal designs, within-person assessment, ecological momentary methods and person-specific modelling techniques to better capture intention–behaviour dynamics.
Conclusions
To close the IBG, future research should integrate dynamic methodologies and real-time interventions that align with situational and motivational states. We advocate for context-sensitive strategies, such as just-in-time adaptive interventions and implementation intentions, to enhance behavioural enactment. This reconceptualization offers a pathway towards more precise theory and effective intervention in health behaviour change
Aerosol microphysical and optical closure study in the Baltic Sea coastal zone
No full textThis study presents results of a field experiment in the Baltic Sea coastal area focused on optical and microphysical aerosol properties and particle water uptake. This experiment took place in Sopot (Poland) in March 2023. Hygroscopic aerosol properties were measured with two Aurora 4000 nephelometers controlled by the Aerosol Condition System (ACS1000), absorption properties with an aethalometer AE-31, and aerosol size distribution with SMPS/OPS devices. Due to the variability of weather conditions, different aerosol properties were observed, including relatively clean marine air mass with sea spray as well as local and long-range transported pollution. Hygroscopic properties defined by the scattering enhancement factor (RH) at 85 % of relative humidity (RH) and kappa parameters show elevated values not only during marine air masses but also during the transport of continental air masses from the south-western direction. Statistically significant Pearson correlation coefficients were found for relations between sulphate aerosol proportion in aerosol mass (from MERRA-2 reanalysis) and both hygroscopicity parameters, (RH = 85 %) and kappa (0.47 and 0.54, respectively).
Experiment closure shows that the aerosol scattering coefficient obtained from numerical simulation based on aerosol size distribution from observations and refractive index estimated from MERRA-2 reanalysis agree with Aurora 4000 measurements. In the case of the aerosol absorption coefficient, the comparison with aethalometer observation is not so consistent due to the high sensitivity of this parameter to the assumed value of the imaginary part of the refractive index
Building Bridges to Foster Circularity: Structure and Dynamics in Circular-oriented Entrepreneurial Ecosystems
No full textMesoscopic fluctuations and multifractality at and across measurement-induced phase transitions
No full textBenchtop NMR Signal Enhancement of Metabolites in Urine Extract using SABRE
No full textMetabolites in a urine extract are signal-enhanced by SABRE hyperpolarization and detected using a benchtop NMR spectrometer. Quantification by standard addition is demonstrated for endogenic urinary nicotinamide (vitamin B3). Even higher sensitivity is achieved in an automated setup for multi-scan SABRE experiments. This hyperpolarization scheme is able to expedite biomarker detection and quantification, while maintaining low infrastructural requirements
Application of 2D elastic FWI to Rayleigh waves acquired at the Herrenknecht test site
No full textElastic full-waveform inversion (FWI) is a physics-based method that can recover quantita-
tive subsurface models by fitting synthetic to observed seismograms. In the near surface,
where depths of interest are in the order of tens of meters, Rayleigh waves are the dominant
energy in seismic records and carry strong sensitivity to shear-wave velocity. Exploiting
this information is particularly valuable for engineering.
The objective of this thesis is to construct a two-dimensional elastic reference model of
the Herrenknecht gravel test site in southern Germany. This site serves as the validation
ground for the newly developed Urban Vibro Truck (UVT), a mobile seismic vibrator
intended for urban geophysical surveys. A reliable near-surface model is essential both for
characterizing the test site itself and for calibrating the emitted source signal.
Seismic data were acquired along two perpendicular profiles using hammer blows at 4 m
intervals and vertical-component geophones at 1 m spacing. Two alternative starting
models were tested: a four-layer model obtained from dispersion-curve inversion and a
smooth linear-gradient model. In both cases, elastic 2D FWI converged to consistent
solutions. The results reveal a low-velocity zone of approximately 200 m/s within the upper
3–5 m, underlain by a rapid increase to 400–500 m/s and a gradual rise to 600–700 m/s at
16 m depth. These features are consistent across both profiles and at their intersection
point, demonstrating the robustness of the inversion.
Multi-parameter tests examined whether compressional velocity (Vp) and density (ρ) could
be reconstruct in addition to shear-wave velocity (Vs). While joint inversions achieved
similar reductions in data misfit, the Vp and ρmodels remained poorly resolved and showed
strong parameter trade-offs. In contrast, the Vs-only inversions yielded stable, geologically
plausible results.
Overall, the study confirms that Rayleigh-wave-based elastic FWI provides a reliable
and reproducible Vs model of the shallow subsurface. This reference model will support
future validation of the UVT source and illustrates both the strengths and limitations of
Rayleigh-wave FWI in near-surface geophysics
Cross section of unirradiated Zry-4 cladding tested under dry storage conditions
No full textDas Video ist mit der Präsentation der Ergebnisse des Bündelversuchs SPIZWURZ (30. QUENCH-Workshop, 2025) verknüpft und zeigt die Verteilung und Orientierung der Hydride entlang des Umfangs des vorhydrierten (300 ppm H) Zry-4-Hüllrohrs, das während dieses Bündelversuchs unter Bedingungen, die eine Trockenlagerung simulieren, mit einem Innendruck von 146 bar belastet wurde. Eine leichte Verformung des Hüllrohres aufgrund ihres Kriechverhaltens ist ebenfalls zu beobachten