More Like this

1. What makes low-frequency earthquakes low frequency

   https://doi.org/10.1126/sciadv.adh3688  

   Wang, Qing-Yu ; Frank, William B. ; Abercrombie, Rachel E. ; Obara, Kazushige ; Kato, Aitaro ( August 2023 , Science Advances)

   Low-frequency earthquakes, atypical seismic events distinct from regular earthquakes, occur downdip of the seismogenic megathrust where an aseismic rheology dominates the subduction plate boundary. Well situated to provide clues on the slip regime of this unique faulting environment, their distinctive waveforms reflect either an unusual rupture process or unusually strong attenuation in their source zone. We take advantage of the unique geometry of seismicity in the Nankai Trough to isolate the spectral signature of low-frequency earthquakes after correcting for empirically derived attenuation. We observe that low-frequency earthquake spectra are consistent with the classical earthquake model, yet their rupture duration and stress drop are orders of magnitude different from ordinary earthquakes. We conclude their low-frequency nature primarily results from an atypical seismic rupture process rather than near-source attenuation.

    

   more » « less
2. 3U-EdgeAI: Ultra-Low Memory Training, Ultra-Low Bitwidth Quantization, and Ultra-Low Latency Acceleration

   https://doi.org/10.1145/3453688.3461738  

   Chen, Yao ; Hawkins, Cole ; Zhang, Kaiqi ; Zhang, Zheng ; Hao, Cong ( June 2021 , Great Lakes Symposium on VLSI)
3. Low-frequency conductivity of low wear high-entropy alloys

   https://doi.org/10.1038/s41467-024-49035-0  

   Yeh, Cheng-Hsien ; Hsu, Wen-Dung ; Liu, Bernard Haochih ; Yang, Chan-Shan ; Kuan, Chen-Yun ; Chang, Yuan-Chun ; Huang, Kai-Sheng ; Jhang, Song-Syun ; Lu, Chia-Yen ; Liaw, Peter K ; et al ( December 2024 , Nature Communications)

   High-entropy alloys (HEAs) provide new research avenues for alloy combinations in the periodic table, opening numerous possibilities in novel-alloy applications. However, their electrical characteristics have been relatively underexplored. The challenge in establishing an HEA electrical conductivity model lies in the changes in electronic characteristics caused by lattice distortion and complexity of nanostructures. Here we show a low-frequency electrical conductivity model for the Nb-Mo-Ta-W HEA system. The cocktail effect is found to explain trends in electrical-conductivity changes in HEAs, while the magnitude of the reduction is understood by the calculated plasma frequency, free electron density, and measured relaxation time by terahertz spectroscopy. As a result, the refractory HEA Nb₁₅Mo₃₅Ta₁₅W₃₅thin film exhibits both high hardness and excellent conductivity. This combination of Nb₁₅Mo₃₅Ta₁₅W₃₅makes it suitable for applications in atomic force microscopy probe coating, significantly improving their wear resistance and atomic-scale image resolution.

    

   more » « less
4. Low-Cost Purpose-Built Ultra-Low-Field NMR Spectrometer

   https://doi.org/10.1021/acs.analchem.4c03149  

   Chowdhury, Md_Raduanul H ; Ahmed, Firoz ; Oladun, Clementinah ; Adelabu, Isaiah ; Abdurraheem, Abubakar ; Nantogma, Shiraz ; Birchall, Jonathan R ; Gafar, Tobi Abdulbasit ; Chekmenev, Yuri A ; Nikolaou, Panayiotis ; et al ( October 2024 , Analytical Chemistry)
5. Towards Fast-Convergence, Low-Delay and Low-Complexity Network Optimization

   https://doi.org/10.1145/3154492  

   Wang, Sinong ; Shroff, Ness ( December 2017 , Proceedings of the ACM on Measurement and Analysis of Computing Systems)