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International Days 2025
No full textVom 5. bis 16. Mai 2025 standen am KIT die International Days ganz im Zeichen der internationalen Vielfalt. Zwei Wochen lang boten sie eine Plattform, um die zahlreichen internationalen Aktivitäten des KIT kennenzulernen und sich über Studien-, Forschungs- und Arbeitsmöglichkeiten im Ausland zu informieren.
In abwechslungsreichen Formaten wie Podiumsdiskussionen, Workshops, Wettbewerben, Infoständen und Coffee Breaks erhielten die Teilnehmenden spannende Einblicke in Mobilitätsprogramme, strategische Partnerschaften und gelebte Netzwerke.
Die International Days haben gezeigt, wie stark das KIT international vernetzt ist und wie vielfältig die Möglichkeiten für Studierende, Forschende und Mitarbeitende sind, über den Tellerrand hinauszuschauen
Radiation effects in silicon photonic modulators of the COTTONTAIL chip
No full textWe report on results of irradiation experiments with ring modulators and Mach-Zehnder modulators of our current silicon photonic transmitter chip COTTONTAIL. Ex-situ experiments on ring modulators show a significant degradation from a total ionizing dose of more than 3 MGy and a difference in low and high frequency behavior. Forward bias annealing can mostly restore the pre-irradiation characteristics, but can leave a small penalty of up to 3 dB, even after extended annealing. In-situ experiments for continuous measurements while irradiating are currently prepared for ring modulators as well as for Mach-Zehnder modulators
Assimilating Doppler wind lidar observations from ‘Swabian MOSES 2023’ reveals substantial wind biases in the ICON-D2 model over the Black Forest
No full textDesign study of the MONIKA ORC-Turbine and comparison with experimental results
No full textThis study presents the development, verification, and validation of a MATLAB code for conducting a mean-line analysis of a four-stage Organic Rankine Cycle (ORC) turbine with a power output of around 100 kW, operated with supercritical propane at the Karlsruhe Institute of Technology (KIT). Typically, a mean-line analysis is performed for an envisaged design point during the initial phase of turbomachinery design. In this study, it is used to analyse the performance and efficiency of a turbine at different operating conditions. Accuracy checks were carried out to validate the applied loss correlations. The ORC turbine was installed in the MONIKA test facility, a modular geothermal power plant, which was tested here using a simulated heat source instead. Propane at a design pressure of 5.5 MPa and a temperature of 390 K, undergoes expansion to an outlet pressure of 1.1 MPa. During the tests, however, the test conditions deviated significantly from the original design, and nitrogen leakage into the propane cycle could not be prevented from the turbine sealing system. The mean-line analysis confirms that the developed code can still predict the ORC turbine\u27s performance and attributes with reasonable accuracy. Additionally, the software can analyse the impact of different design alterations on the thermodynamic properties of the fluid at the inlet and outlet, as well as on the performance of the turbine
Search for a cH signal in the associated production of at least one charm quark with a Higgs boson in the diphoton decay channel in pp collisions at TeV
No full textThis paper presents the first search for a cH signal sensitive to the coupling of the charm quark (c) to the Higgs boson (H) in the associated production of at least one charm quark with a Higgs boson decaying to two photons. The results are based on a data set of proton-proton collisions at a center-of-mass energy of 13 TeV collected with the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb. Assuming the standard model (SM) rates for all other Higgs boson production processes, the observed (expected) upper limit at 95% confidence level on the cH signal strength is 243 (355) times the SM prediction. Under the same assumption, the observed (expected) allowed interval on the Higgs boson to charm quark coupling modifier, κc, is |κc| < 38.1 (|κc| < 72.5) at 95% confidence level
An Equitable Experience? How HCI Research Conceptualizes Accessibility of Virtual Reality in the Context of Disability
No full textCreating accessible Virtual Reality (VR) is an ongoing concern in the Human-Computer Interaction (HCI) research community. However, there is little reflection on how accessibility should be conceptualized in the context of an experiential technology. We address this gap in our work: We first explore how accessibility is currently defined, highlighting a growing recognition of the importance of equitable and enriching experiences. We then carry out a literature study (N = 28) to examine how accessibility and its relationship with experience is currently conceptualized in VR research. Our results show that existing work seldom defines accessibility in the context of VR and that barrier-centric research is prevalent. Likewise, we show that experience—e.g., that of presence or immersion—is rarely designed for or evaluated, while participant feedback suggests that it is relevant for disabled users of VR. On this basis, we contribute a working definition of VR accessibility that considers experience a necessary condition for equitable access, and discuss the need for future work to focus on experience in the same way as VR research addressing non-disabled persons does