More Like this

1. AcTune: Uncertainty-Based Active Self-Training for Active Fine-Tuning of Pretrained Language Models

   https://doi.org/10.18653/v1/2022.naacl-main.102  

   Yu, Yue ; Kong, Lingkai ; Zhang, Jieyu ; Zhang, Rongzhi ; Zhang, Chao ( January 2022 , Proceedings of the 2022 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies)
2. Heterometallic [Cu–O–M] 2+ active sites for methane C–H activation in zeolites: stability, reactivity, formation mechanism and relationship to other active sites

   https://doi.org/10.1039/d1cy00687h  

   Adeyiga, Olajumoke ; Panthi, Dipak ; Odoh, Samuel O. ( August 2021 , Catalysis Science & Technology)

   The formation and reactivities of [Cu–O–M] 2+ species (M = Ti–Cu, Zr–Mo and Ru–Ag) in metal-exchanged zeolites, as well as stabilities of these species towards autoreduction by O 2 elimination are investigated with density functional theory. These species were investigated in zeolite mordenite in search of insights into active site formation mechanisms, the relationship between stability and reactivity as well as discovery of heterometallic species useful for isothermal methane-to-methanol conversion (MMC). Several [Cu–O–M] 2+ species (M = Ti–Cr and Zr–Mo) are substantially more stable than [Cu 2 O] 2+ . Other [Cu–O–M] 2+ species, (M = Mn–Ni and Ru–Ag) have similar formation energies to [Cu 2 O] 2+ , to within ±10 kcal mol −1 . Interestingly, only [Cu–O–Ag] 2+ is more active for methane activation than [Cu 2 O] 2+ . [Cu–O–Ag] 2+ is however more susceptible to O 2 elimination. By considering the formation energies, autoreduction, cost and activity towards the methane C–H bond, we can only conclude that [Cu 2 O] 2+ is best suited for MMC. Formation of [Cu 2 O] 2+ is initiated by proton transfer from aquo ligands to the framework and proceeds mostly via dehydration steps. Its μ-oxo bridge is formed via water-assisted condensation of two hydroxo groups. To evaluate the relationship between [Cu 2 O] 2+ and other active sites, we also examined the formation energies of other species. The formation energies follow the trend: isolated [Cu–OH] + < paired [Cu–OH] + < [Cu 2 O] 2+ < [Cu 3 O 3 ] 2+ . Inclusion of Gibbs free-energy corrections indicates activation temperatures of 257, 307 and 327 and 331 °C for isolated [Cu–OH] + , paired [Cu–OH] + , [Cu 2 O] 2+ and [Cu 3 O 3 ] 2+ , respectively. The provocative nature of the lower-than-expected activation temperature for isolated [Cu–OH] + species is discussed. 

   more » « less
3. Enhanced Memory as a Common Effect of Active Learning: Enhanced Memory Through Active Learning

   https://doi.org/10.1111/mbe.12117  

   Markant, Douglas B. ; Ruggeri, Azzurra ; Gureckis, Todd M. ; Xu, Fei ( September 2016 , Mind, Brain, and Education)
4. Properties of Flare-imminent versus Flare-quiet Active Regions from the Chromosphere through the Corona. I. Introduction of the AIA Active Region Patches (AARPs)

   https://doi.org/10.3847/1538-4357/ac9c06  

   Dissauer, Karin ; Leka, K. D. ; Wagner, Eric L. ( January 2023 , The Astrophysical Journal)

   Abstract We begin here a series of papers examining the chromospheric and coronal properties of solar active regions. This first paper describes an extensive data set of images from the Atmospheric Imaging Assembly on the Solar Dynamics Observatory curated for large-sample analysis of this topic. Based on (and constructed to coordinate with) the “Active Region Patches” as identified by the pipeline data analysis system for the Helioseismic and Magnetic Imager on the same mission (the “HARPs”), the “AIA Active Region Patches” (AARPs), described herein, comprise an unbiased multiwavelength set of FITS files downsampled spatially only by way of HARP-centered patch extractions (full spatial sampling is retained), and downsampled in the temporal domain but still able to describe both short-lived kinematics and longer-term trends. The AARPs database enables physics-informed parameterization and analysis using nonparametric discriminant analysis in Paper II of this series, and is validated for analysis using differential emission measure techniques. The AARP data set presently covers mid-2010 through 2018 December, is ≈9 TB in size, and is available through the Solar Data Analysis Center. 

   more » « less
5. Physics of smart active matter: integrating active matter and control to gain insights into living systems

   https://doi.org/10.1039/D3SM00171G  

   Levine, Herbert ; Goldman, Daniel I. ( June 2023 , Soft Matter)

   We offer our opinion on the benefits of integration of insights from active matter physics with principles of regulatory interactions and control to develop a field we term “smart active matter”. This field can provide insight into important principles in living systems as well as aid engineering of responsive, robust and functional collectives. 

   more » « less