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   Wu, Mingshi; Zohaib, Ali; Durumeric, Zakir; Houmansadr, Amir; Wustrow, Eric (May 2025, IEEE Symposium on Security and Privacy)

   China has long orchestrated its Internet censorship through relatively centralized policies and a unified implementation, known as the Great Firewall of China (GFW). However, since August 2023, anecdotes suggest that the Henan Province has deployed its own regional censorship. In this work, we characterize provincial-level censorship in Henan, and compare it with the national-level GFW. We find that Henan has established TLS SNI-based and HTTP Host-based censorship that inspects and blocks traffic leaving the province. While the Henan Firewall is less sophisticated and less robust against typical network variability, its volatile and aggressive blocking of second-level domains made it block ten times more websites than the GFW at some points in time. Based on the observed parsing flaws and injection behaviors, we introduce simple client-side methods to bypass censorship in the Henan province. Our work documents an alarming sign of regional censorship emerging in China. 

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2. TASEP with a moving wall

   https://doi.org/10.1214/22-AIHP1335  

   Borodin, Alexei; Bufetov, Alexey; Ferrari, Patrik L (February 2024, Annales de l'Institut Henri Poincaré, Probabilités et Statistiques)
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   Hoque, Arifa; Jones, Alex K.; Bhanja, Sanjukta (January 2022, IEEE Transactions on Nanotechnology)
4. A war on the cell wall

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5. Wall-to-wall optimal transport in two dimensions

   https://doi.org/10.1017/jfm.2020.42  

   Souza, Andre N.; Tobasco, Ian; Doering, Charles R. (April 2020, Journal of Fluid Mechanics)

   Gradient ascent methods are developed to compute incompressible flows that maximize heat transport between two isothermal no-slip parallel walls. Parameterizing the magnitude of the velocity fields by a Péclet number $Pe$ proportional to their root-mean-square rate of strain, the schemes are applied to compute two-dimensional flows optimizing convective enhancement of diffusive heat transfer, i.e. the Nusselt number $Nu$ up to $$Pe\approx 10^{5}$$ . The resulting transport exhibits a change of scaling from $$Nu-1\sim Pe^{2}$$ for $Pe<10$ in the linear regime to $$Nu\sim Pe^{0.54}$$ for $$Pe>10^{3}$$ . Optimal fields are observed to be approximately separable, i.e. products of functions of the wall-parallel and wall-normal coordinates. Analysis employing a separable ansatz yields a conditional upper bound $${\lesssim}Pe^{6/11}=Pe^{0.\overline{54}}$$ as $$Pe\rightarrow \infty$$ similar to the computationally achieved scaling. Implications for heat transfer in buoyancy-driven Rayleigh–Bénard convection are discussed. 

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