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Agrarische bedrijfsopvolging en Hoge Raad 21 maart 2025:een welkome ‘gift’ voor de familierechtadvocaat?
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Vooral industriële regio’s in Europa kwetsbaar voor Amerikaanse heffingen
No full textDe hoge muren van importheffingen die het afgelopen halfjaar door de Verenigde Staten zijn geïntroduceerd, hebben negatieve consequenties voor de economische activiteit. Voor welke Europese en Nederlandse regio’s zijn de risico’s het grootst
Clinical evaluation of rubber dam tension on the accuracy of intraoral scans
No full textAIM: To evaluate the accuracy of digital scans made under heavy-gauge latex rubber dam isolation for single-tooth indirect bonded posterior restorations on first molars by assessing the firmness of the proximal contact (PC) after delivery.MATERIALS AND METHODS: In the present retrospective study, partial-bonded leucite-reinforced feldspathic ceramic indirect restorations with the inclusion of the mesial and distal contact points were prepared on first molars under heavy-gauge latex rubber dam isolation. Two groups were compared: in group W, the teeth were held in their initial position using interproximal wedges; in group NW, the teeth were free to migrate under the tension produced by the rubber dam. A digital scan under rubber dam was taken for both groups, and the restorations were made by one dental technician. After delivery, the firmness of the restorations' PCs was evaluated. The chi-square test was used with a significance level of 5%.RESULTS: Forty partial-bonded leucite-reinforced feldspathic ceramic indirect restorations were included in the present study, 20 in group W and 20 in group NW (N = 40 patients; 19 maxillary molars and 21 mandibular molars). Evaluations performed 6 months after delivery demonstrated that the restorations in group W showed significantly better (P 0.01) PCs than those in group NW.CONCLUSIONS: Heavy-gauge rubber dam induces tooth migration, which impairs the PC of indirect bonded restorations. Scanning under rubber dam allows precise PCs to be achieved when the prepared teeth are held in their initial position by interproximal wedges.</p
Selective manipulation of low-frequency modes in conjugated polymers via chirped pulses
No full textControlling femtosecond vibronic dynamics in π-conjugated polymers is essential for advancing optoelectronic material design. However, ultrafast spectroscopic studies to elucidate the complex interplay of electronic and vibrational dynamics in these systems focused on the impact of high-frequency vibrations. Here, we combine experiment and theory to demonstrate that ultrafast control over the vibronic dynamics involving a low-frequency mode in poly(3-hexylthiophene) is possible via a photoluminescence-detected chirp-dependent double-pump approach. By chirping one of the pump pulses, we show that the temporal ordering of resonant frequency components can be used to engineer the initial vibronic coherence induced in the system. Particularly, the spectroscopic signals reveal distinct symmetry properties as a function of inter-pulse delay and chirp, i.e., delay and chirp can be used to manipulate quantum beats associated to the system’s vibronic dynamics. Importantly, our signals highlight quantum dynamical features associated to low-frequency vibrational modes in the conjugated polymer. Last, we show that tuning the pulses’ central wavelength can be used to manipulate the symmetry and phase information in the signals. Simulations show that the effective interference between the phase of the pump pulses and the photoinduced vibronic wavepacket determines the evolution and symmetry of the delay- and chirp-dependent signals. Our results establish chirp-dependent time-resolved spectroscopy as a powerful control tool to selectively manipulate low-frequency vibronic dynamics in excitonic materials, such as conjugated polymers
MWA_HYPERDRIVE:Next generation calibration software for the Murchison Widefield Array radio telescope
No full textExploration of the redshifted 21cm signal from the Epoch of Reionisation (EoR) requires precisely and accurately calibrated data from low-frequency radio telescopes. We present MWA_HYPERDRIVE (hereafter HYPERDRIVE), a calibration software package designed for the Murchison Widefield Array (MWA), with an emphasis on correctness for EoR science. HYPERDRIVE provides improved and faster results than its predecessors, and is easy to use on a wider variety of compute platforms.</p
Volk en staatsburgerschap
No full textHet Koninkrijk der Nederlanden: één staatsverband, één staatsburgerschap en meerdere volkeren? Het Koninkrijk der Nederlanden omvat Nederland, Aruba, Curaçao en Sint Maarten en kent één staatsburgerschap: het Nederlanderschap. Uit deze bijdrage blijkt dat dit staatsburgerschap niet een gezamenlijk volkswezen in zich bergt
