11 research outputs found
High-Strength Amorphous Silicon Carbide for Nanomechanics
For decades, mechanical resonators with high sensitivity have been realized
using thin-film materials under high tensile loads. Although there have been
remarkable strides in achieving low-dissipation mechanical sensors by utilizing
high tensile stress, the performance of even the best strategy is limited by
the tensile fracture strength of the resonator materials. In this study, a
wafer-scale amorphous thin film is uncovered, which has the highest ultimate
tensile strength ever measured for a nanostructured amorphous material. This
silicon carbide (SiC) material exhibits an ultimate tensile strength of over 10
GPa, reaching the regime reserved for strong crystalline materials and
approaching levels experimentally shown in graphene nanoribbons. Amorphous SiC
strings with high aspect ratios are fabricated, with mechanical modes exceeding
quality factors 10^8 at room temperature, the highest value achieved among SiC
resonators. These performances are demonstrated faithfully after characterizing
the mechanical properties of the thin film using the resonance behaviors of
free-standing resonators. This robust thin-film material has significant
potential for applications in nanomechanical sensors, solar cells, biological
applications, space exploration and other areas requiring strength and
stability in dynamic environments. The findings of this study open up new
possibilities for the use of amorphous thin-film materials in high-performance
applications
A multi-element psychosocial intervention for early psychosis (GET UP PIANO TRIAL) conducted in a catchment area of 10 million inhabitants: study protocol for a pragmatic cluster randomized controlled trial
Multi-element interventions for first-episode psychosis (FEP) are promising, but have mostly been conducted in non-epidemiologically representative samples, thereby raising the risk of underestimating the complexities involved in treating FEP in 'real-world' services
Prospects for fundamental physics with LISA
In this paper, which is of programmatic rather than quantitative nature, we aim to further delineate and sharpen the future potential of the LISA mission in the area of fundamental physics. Given the very broad range of topics that might be relevant to LISA,we present here a sample of what we view as particularly promising fundamental physics directions. We organize these directions through a “science-first” approach that allows us to classify how LISA data can inform theoretical physics in a variety of areas. For each of these theoretical physics classes, we identify the sources that are currently expected to provide the principal contribution to our knowledge, and the areas that need further development. The classification presented here should not be thought of as cast in stone, but rather as a fluid framework that is amenable to change with the flow of new insights in theoretical physics
Prospects for fundamental physics with LISA
We provide an updated assessment of the fundamental physics potential of LISA. Given the very broad range of topics that might be relevant to LISA, we present here a sample of what we view as particularly promising directions, based in part on the current research interests of the LISA scientific community in the area of fundamental physics. We organize these directions through a ``science-first'' approach that allows us to classify how LISA data can inform theoretical physics in a variety of areas. For each of these theoretical physics classes, we identify the sources that are currently expected to provide the principal contribution to our knowledge, and the areas that need further development. The classification presented here should not be thought of as cast in stone, but rather as a fluid framework that is amenable to change with the flow of new insights in theoretical physics
Waveform Modelling for the Laser Interferometer Space Antenna
International audienceLISA, the Laser Interferometer Space Antenna, will usher in a new era in gravitational-wave astronomy. As the first anticipated space-based gravitational-wave detector, it will expand our view to the millihertz gravitational-wave sky, where a spectacular variety of interesting new sources abound: from millions of ultra-compact binaries in our Galaxy, to mergers of massive black holes at cosmological distances; from the beginnings of inspirals that will venture into the ground-based detectors' view to the death spiral of compact objects into massive black holes, and many sources in between. Central to realising LISA's discovery potential are waveform models, the theoretical and phenomenological predictions of the pattern of gravitational waves that these sources emit. This white paper is presented on behalf of the Waveform Working Group for the LISA Consortium. It provides a review of the current state of waveform models for LISA sources, and describes the significant challenges that must yet be overcome
Waveform Modelling for the Laser Interferometer Space Antenna
International audienceLISA, the Laser Interferometer Space Antenna, will usher in a new era in gravitational-wave astronomy. As the first anticipated space-based gravitational-wave detector, it will expand our view to the millihertz gravitational-wave sky, where a spectacular variety of interesting new sources abound: from millions of ultra-compact binaries in our Galaxy, to mergers of massive black holes at cosmological distances; from the beginnings of inspirals that will venture into the ground-based detectors' view to the death spiral of compact objects into massive black holes, and many sources in between. Central to realising LISA's discovery potential are waveform models, the theoretical and phenomenological predictions of the pattern of gravitational waves that these sources emit. This white paper is presented on behalf of the Waveform Working Group for the LISA Consortium. It provides a review of the current state of waveform models for LISA sources, and describes the significant challenges that must yet be overcome