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Chirality-enabled unidirectional light emission and nanoparticle detection in parity-time-symmetric microcavity
Achieving unidirectional emission and manipulating waves in a microcavity are crucial for information processing and data transmission in next-generation photonic circuits (PCs). Here we show how to impose twin microcavities with opposite chirality by incorporating parity-time (PT) symmetry to realize unidirectional emission. Our numerical calculation results show that the opposite chirality in microcavities stems from the asymmetric coupling of the clockwise (CW) and counterclockwise (CCW) components carried by the attached waveguide to the left- or right-sided microcavities, respectively. Notably, by engineering PT symmetry in the coupled system via the gain-loss control, the clockwise component of the lossy cavity could be selectively suppressed, which leads to the unidirectional emission with an extinction ratio of up to -52 dB. Furthermore, the chirality and PT-symmetry breaking enabled unidirectional emission is extremely sensitive to external scatters, allowing the detection of nanoparticles with an ultrasmall radius of 5-50 nm by recording the extinction ratio change. The proposed system provides a simple yet general way to manipulate the standing waves in a microcavity and will be essential for advancing the potentials of the microcavity in PCs.This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]
Detecting Extra Dimension By the Experiment of the Quantum Gravity Induced Entanglement of Masses
It is believed that gravity may be regarded as a quantum coherent mediator.
In this work we propose a plan using the Quantum Gravity Induced Entanglement
of Masses (QGEM) experiment to test the extra dimension. The experiment
involves two freely falling test masses passing though a Stern-Gerlach-like
device. We study the entanglement witness of them in the framework of
Randall-Sundrum II model (RS-II). It turns out that the system would reach
entangled more rapidly in the presence of extra dimension. In particular, this
is more significant for large radius of extra dimension
InfeRE: Step-by-Step Regex Generation via Chain of Inference
Automatically generating regular expressions (abbrev. regexes) from natural
language description (NL2RE) has been an emerging research area. Prior studies
treat regex as a linear sequence of tokens and generate the final expressions
autoregressively in a single pass. They did not take into account the
step-by-step internal text-matching processes behind the final results. This
significantly hinders the efficacy and interpretability of regex generation by
neural language models. In this paper, we propose a new paradigm called InfeRE,
which decomposes the generation of regexes into chains of step-by-step
inference. To enhance the robustness, we introduce a self-consistency decoding
mechanism that ensembles multiple outputs sampled from different models. We
evaluate InfeRE on two publicly available datasets, NL-RX-Turk and KB13, and
compare the results with state-of-the-art approaches and the popular tree-based
generation approach TRANX. Experimental results show that InfeRE substantially
outperforms previous baselines, yielding 16.3% and 14.7% improvement in DFA@5
accuracy on two datasets, respectively. Particularly, InfeRE outperforms the
popular tree-based generation approach by 18.1% and 11.3% on both datasets,
respectively, in terms of DFA@5 accuracy.Comment: This paper has been accepted by ASE'2
Semi-implicit Continuous Newton Method for Power Flow Analysis
This paper proposes a semi-implicit version of continuous Newton method (CNM)
for power flow analysis. The proposed method succeeds the numerical robustness
from the implicit CNM (ICNM) framework while prevents the iterative solution of
nonlinear systems, hence revealing higher convergence speed and computation
efficiency. The intractability of ICNM consists in its nonlinear implicit
ordinary-differential-equation (ODE) nature. We circumvent this by introducing
intermediate variables, hence converting the implicit ODEs into differential
algebraic equations (DAEs), and solve the DAEs with a linear scheme, the
stiffly accurate Rosenbrock type method (SARM). A new 4-stage 3rd-order
hyper-stable SARM, together with a 2nd-order embedded formula to control the
step size, is constructed. Case studies on system 9241pegase verified the
alleged performance
Method to Annotate Arrhythmias by Deep Network
This study targets to automatically annotate on arrhythmia by deep network.
The investigated types include sinus rhythm, asystole (Asys), supraventricular
tachycardia (Tachy), ventricular flutter or fibrillation (VF/VFL), ventricular
tachycardia (VT). Methods: 13s limb lead ECG chunks from MIT malignant
ventricular arrhythmia database (VFDB) and MIT normal sinus rhythm database
were partitioned into subsets for 5-fold cross validation. These signals were
resampled to 200Hz, filtered to remove baseline wandering, projected to 2D gray
spectrum and then fed into a deep network with brand-new structure. In this
network, a feature vector for a single time point was retrieved by residual
layers, from which latent representation was extracted by variational
autoencoder (VAE). These front portions were trained to meet a certain
threshold in loss function, then fixed while training procedure switched to
remaining bidirectional recurrent neural network (RNN), the very portions to
predict an arrhythmia category. Attention windows were polynomial lumped on RNN
outputs for learning from details to outlines. And over sampling was employed
for imbalanced data. The trained model was wrapped into docker image for
deployment in edge or cloud. Conclusion: Promising sensitivities were achieved
in four arrhythmias and good precision rates in two ventricular arrhythmias
were also observed. Moreover, it was proven that latent representation by VAE,
can significantly boost the speed of convergence and accuracy
Airframe-Propulsion Integration Design and Optimization
Airframe-propulsion integration design is one of the key technologies of the hypersonic vehicle. With the development of hypersonic vehicle design method, CFD technology, and optimization method, it is possible to improve the conceptual design of airframe-propulsion integration both in accuracy and efficiency. In this chapter, design methods of waverider airframes and propulsion systems, including inlets, nozzles, isolators, and combustors, are reviewed and discussed in the light of CFD analyses. Thereafter, the Busemann inlet, a three-dimensional flow-stream traced nozzle, and a circular combustor together with a cone-derived waverider are chosen to demonstrate the airframe-propulsion integration design. The propulsion system is optimized according to the overall performance, and then the component such as the nozzle is optimized to obtain a better conceptual configuration
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