361 research outputs found
A scaled local gate controller for optically addressed qubits
Scalable classical controllers are a key component of future fault-tolerant
quantum computers. Neutral atom quantum computers leverage commercially
available optoelectronic devices for generating large-scale tweezer arrays and
performing parallel readout, but implementing massively parallel,
locally-addressed gate operations is an open challenge. In this work, we
demonstrate an optical modulator system based on off-the-shelf components,
which can generate a two-dimensional array of over 10,000 focused spots with
uniform frequency and amplitude, and switching them on and off individually in
arbitrary configurations at rates of up to 43 kHz. Through careful control of
aberrations, the modulator achieves an extinction ratio of 46 dB, and
nearest-neighbor crosstalk of dB with a beam spacing of 4.6 waists. The
underlying components can operate at wavelengths from the UV to the NIR, and
sustain high laser intensities. This approach is suitable for local addressing
of gates with low cross-talk error rates in any optically addressed qubit
platform, including neutral atoms, trapped ions, or solid-state atomic defects
An Efficient End-to-End Transformer with Progressive Tri-modal Attention for Multi-modal Emotion Recognition
Recent works on multi-modal emotion recognition move towards end-to-end
models, which can extract the task-specific features supervised by the target
task compared with the two-phase pipeline. However, previous methods only model
the feature interactions between the textual and either acoustic and visual
modalities, ignoring capturing the feature interactions between the acoustic
and visual modalities. In this paper, we propose the multi-modal end-to-end
transformer (ME2ET), which can effectively model the tri-modal features
interaction among the textual, acoustic, and visual modalities at the low-level
and high-level. At the low-level, we propose the progressive tri-modal
attention, which can model the tri-modal feature interactions by adopting a
two-pass strategy and can further leverage such interactions to significantly
reduce the computation and memory complexity through reducing the input token
length. At the high-level, we introduce the tri-modal feature fusion layer to
explicitly aggregate the semantic representations of three modalities. The
experimental results on the CMU-MOSEI and IEMOCAP datasets show that ME2ET
achieves the state-of-the-art performance. The further in-depth analysis
demonstrates the effectiveness, efficiency, and interpretability of the
proposed progressive tri-modal attention, which can help our model to achieve
better performance while significantly reducing the computation and memory
cost. Our code will be publicly available
Osteoporosis and coronary heart disease: a bi-directional Mendelian randomization study
BackgroundOsteoporosis (OP) and cardiovascular disease (CVD) are major global public health issues, especially exacerbated by the challenges of an aging population. As these problems intensify, the associated burden on global health is expected to increase significantly. Despite extensive epidemiological investigations into the potential association between OP and CVD, establishing a clear causal relationship remains elusive.MethodsInstrumental variables were selected from summary statistics of the IEU GWAS database. Five different components of BMD (heel BMD, LS BMD, FA BMD, FN BMD, and TB BMD) were used as OP phenotypes. CHD, MI, and stroke were selected to represent CVD. Multiple analysis methods were used to evaluate the causal relationship between CVD and OP comprehensively. In addition, sensitivity analyses(Cochran’s Q test, MR-Egger intercept test, and “leave one out” analysis) were performed to verify the reliability of the results.ResultsThe MR showed a significant causal relationship between CHD on heel BMD and TB BMD; in the reverse analysis, there was no evidence that OP has a significant causal effect on CVD. The reliability of the results was confirmed through sensitivity analysis.ConclusionThe study results revealed that CHD was causally associated with Heel BMD and TB BMD, while in the reverse MR analysis, the causal relationship between OP and CVD was not supported. This result posits CHD as a potential etiological factor for OP and prompts that routine bone density assessment at traditional sites (forearm, femoral neck, lumbar spine) using DAX may inadequately discern underlying osteoporosis issues in CHD patients. The recommendation is to synergistically incorporate heel ultrasound or DAX for total body bone density examinations, ensuring clinical diagnostics are both precise and reliable. Moreover, these findings provide valuable insights for public health, contributing to the development of pertinent prevention and treatment strategies
Analysis of bilinear oscillators under harmonic loading using nonlinear output frequency response functions
In this paper, the new concept of Nonlinear Output Frequency Response Functions (NOFRFs) is extended to the harmonic input case, an input-independent relationship is found between the NOFRFs and the Generalized Frequency Response Functions (GFRFs). This relationship can greatly simplify the application of the NOFRFs. Then, beginning with the demonstration that a bilinear oscillator can be approximated using a polynomial type nonlinear oscillator, the NOFRFs are used to analyze the energy transfer phenomenon of bilinear oscillators in the frequency domain. The analysis provides insight into how new frequency generation can occur using bilinear oscillators and how the sub-resonances occur for the bilinear oscillators, and reveals that it is the resonant frequencies of the NOFRFs that dominate the occurrence of this well-known nonlinear behaviour. The results are of significance for the design and fault diagnosis of mechanical systems and structures which can be described by a bilinear oscillator model
Self-Sealing of Nanoporous Low Dielectric Constant Patterns Fabricated by Nanoimprint Lithography
No Abstract.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/58644/1/1934_ftp.pd
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