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  2. arxiv.org arxiv.org
    A Posteriori Error Analysis of Runge–Kutta Discontinuous Galerkin Schemes with SIAC Post-Processing
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    1. fxp007 09 Apr 2026
      In order to use the relative entropy method, we reconstruct the numerical solution via tensor-product Smoothness-Increasing Accuracy-Conserving (SIAC) filtering which has superconvergence properties.

      SIAC 滤波器的「超收敛」性质令人印象深刻：对多项式次数为 q 的 DG 解进行 SIAC 后处理后，收敛阶从 q+1 跃升至 2q+1——精度几乎翻倍，却几乎不增加计算代价。这是数值分析中罕见的「免费午餐」：滤波本身是线性操作，计算量微乎其微，却能将误差的收敛速率提升一个整量级。

      SIAC-filtering superconvergence post-processing surprising
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    arxiv.org/html/2604.01200v1
  3. Mar 2022
  4. psyarxiv.com psyarxiv.com
    Post-COVID symptoms in the absence of organic deficit - Lessons from diseases we know
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    1. emilybiggs 31 Mar 2022

      Lehnen, N., Glasauer, S., Schröder, L., Regnath, F., Biersack, K., Bergh, O. V. den, & Werder, D. von. (2022). Post-COVID symptoms in the absence of organic deficit—Lessons from diseases we know. PsyArXiv. https://doi.org/10.31234/osf.io/yqar2

      is:preprint lang:en COVID-19 post-COVID symptom organic deficit disease severe symptoms organic impairment body signals brain experimental paradigm body symptoms breathlessness dizziness experience fatigue interoception informational processing long COVID perception predictive coding rebreathing persistent symptoms
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    psyarxiv.com/yqar2/