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The application of the orthogonal conditional nonlinear optimal perturbations method to typhoon track ensemble forecasts

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Science China Earth Sciences 2019年第2期62卷 376-388页

作者： Zhenhua huo Wansuo DUAN National Meteorological Center China Meteorological Administration State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences

The orthogonal conditional nonlinear optimal perturbations (CNOPs) method, orthogonal singular vectors (SVs)method and CNOP+SVs method, which is similar to the orthogonal SVs method but replaces the leading SV (LSV) with the first CNOP, are adopted in both the Lorenz-96 model and Pennsylvania State University/National Center for Atmospheric Research (PSU/NCAR) Fifth-Generation Mesoscale Model (MM5) for ensemble forecasts. Using the MM5, typhoon track ensemble forecasting experiments are conducted for strong Typhoon Matsa in 2005. The results of the Lorenz-96 model show that the CNOP+SVs method has a higher ensemble forecast skill than the orthogonal SVs method, but ensemble forecasts using the orthogonal CNOPs method have the highest forecast skill. The results from the MM5 show that orthogonal CNOPs have a wider horizontal distribution and better describe the forecast uncertainties compared with SVs. When generating the ensemble mean forecast, equally averaging the ensemble members in addition to the anomalously perturbed forecast members may contribute to a higher forecast skill than equally averaging all of the ensemble members. Furthermore, for given initial perturbation amplitudes, the CNOP+SVs method may not have an ensemble forecast skill greater than that of the orthogonal SVs method, but the orthogonal CNOPs method is likely to have the highest forecast skill. Compared with SVs, orthogonal CNOPs fully consider the influence of nonlinear physical processes on the forecast results; therefore, considering the influence of nonlinearity may be important when generating fast-growing initial ensemble perturbations. All of the results show that the orthogonal CNOP method may be a potential new approach for ensemble forecasting.

关键词： Ensemble forecasts Initial perturbation Conditional nonlinear optimal perturbation Singular vector Typhoon track

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A survey on deep learning-based Monte Carlo denoising

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Computational Visual Media 2021年第2期7卷 169-185页

作者： Yuchi huo Sung-eui Yoon KAIST Daejeon31414Republic of Korea

Monte Carlo(MC)integration is used ubiquitously in realistic image synthesis because of its flexibility and ***,the integration has to balance estimator bias and variance,which causes visually distracting noise with low sample *** solutions fall into two categories,in-process sampling schemes and post-processing reconstruction *** report summarizes recent trends in the post-processing reconstruction *** years have seen increasing attention and significant progress in denoising MC rendering with deep learning,by training neural networks to reconstruct denoised rendering results from sparse MC *** of these techniques show promising results in real-world applications,and this report aims to provide an assessment of these approaches for practitioners and researchers.

关键词： rendering Monte Carlo(MC)denoising deep learning ray tracing

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Tracking Cryptosporidium in urban wastewater treatment plants in a cold region:Occurrence,species and infectivity

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Frontiers of Environmental Science & Engineering 2022年第9期16卷 1-14页

作者： Dan Xiao Zhaofeng Lyu Shiheng Chen Yang huo Wei Fan Mingxin huo Jilin Academy of Agricultural Sciences Changchun 130033China School of Chemical Engineering Changchun University of TechnologyChangchun 130012China School of Environment Northeast Normal UniversityChangchun 130117China

This study investigated the occurrence,species,infectivity and removal efficiency of Cryptosporidium *** typical wastewater treatment *** from different process units were collected seasonally and synchronously from four wastewater treatment plants(WWTPs)in Northeastern *** Cryptosporidium oocysts were identified in most samples from both influent(97.50%)and effluent(90.00%)wastewaters of the four WWTPs,at an average density of 26.34 and 4.15 oocysts/L,*** overall removal efficiency was 84.25%,and oocysts were mainly removed(62.01%)by the modified secondary sedimentation *** Cryptosporidium species were identified in the effluent ***,***,and *** were the three most prevalent *** viability assays indicated no reduction of excystation rate during the primary and secondary wastewater treatments(varied in the range of 63.08%–68.50%),but the excystation rate declined to 52.21%in the effluent after ***,the Cryptosporidium oocysts showed higher infection intensity in the cold season(winter and spring)than that in summer and *** influences of environmental temperature on virulence factors of Cryptosporidium were further *** was observed that more extracellular secretory proteins were bound on the oocyst surface and several virulence genes were expressed relatively strongly at low temperatures,both of which could facilitate oocyst adhesion,invasion,and host immune *** research is of considerable interest since it serves as an important step towards more accurate panoramic recognition of Cryptosporidium risk reduction in WWTPs,and especially highlights the potential health risk associated with Cryptosporidium in cold regions/seasons.

关键词： WWTPs Cryptosporidium Occurrence Species Infectivity Low temperature

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Self-consistent tomography of temporally correlated errors

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Communications in Theoretical Physics 2021年第7期73卷 59-74页

作者： Mingxia huo Ying Li Beijing Computational Science Research Center Beijing 100193China Department of Physics and Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science School of Mathematics and PhysicsUniversity of Science and Technology BeijingBeijing 100083China Graduate School of China Academy of Engineering Physics Beijing 100193China

The error model of a quantum computer is essential for optimizing quantum algorithms to minimize the impact of errors using quantum error correction or error *** with temporal correlations,***-frequency noise and context-dependent noise,is common in quantum computation devices and sometimes even ***,conventional tomography methods have not been developed for obtaining an error model describing temporal *** this paper,we propose self-consistent tomography protocols to obtain a model of temporally correlated errors,and we demonstrate that our protocols are efficient for low-frequency noise and context-dependent noise.

关键词： self-consistent tomography temporally correlated errors quantum computer

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Local Well-posedness of the Derivative Schrödinger Equation in Higher Dimension for Any Large Data

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Chinese Annals of Mathematics,Series B 2022年第6期43卷 977-998页

作者： Boling GUO Zhaohui huo Institute of Applied Physics and Computational Mathematics P.O.Box 8009Beijing 100088China Institute of Mathematics Academy of Mathematics and Systems ScienceCASBeijing 100190China Hua Loo-Keng Key Laboratory of Mathematics Chinese Academy of SciencesBeijing 100190China

In this paper,the authors consider the local well-posedness for the derivative Schrödinger equation in higher dimension ut-iΔu+|u|^(2)(→γ·▽u)+u^(2)(→λ·▽-u)=0,(x,t)∈R^(n)×R,→γ,→λ∈R^(n);n≥2 It is shown that the Cauchy problem of the derivative Schrödinger equation in higher dimension is locally well-posed in H^(s)(R^(n))(s>n/2)for any large initial *** this result can compare with that in one dimension except for the endpoint space H^(n/2).

关键词： Well-posedness Derivative Schrödinger equation in higher dimension Short-time Xs b Large initial data

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Classical solutions to relativistic Burgers equations in FLRW space-times

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Science China Mathematics 2020年第2期63卷 357-370页

作者： Saisai huo Changhua Wei School of Mathematical Sciences Zhejiang UniversityHangzhou 310027China Department of Mathematics Zhejiang Sci-Tech UniversityHangzhou 310018China

We are interested in the classical solutions to the Cauchy problem of relativistic Burgers equations evolving in Friedmann-Lemat?tre-Robertson-Walker(FLRW)space-times,which are spatially homogeneous,isotropic expanding or contracting *** such kind of space-times,we first derive the relativistic Burgers equations from the relativistic Euler equations by letting the pressure be *** we can show the global existence of the classical solution to the derived equation in the accelerated expanding space-times with small initial data by the method of characteristics when the spacial dimension n=1 and the energy estimate when n 2,***,we can also show the lifespan of the classical solution by similar methods when the expansion rate of the space-times is not so fast.

关键词： FLRW space-times relativistic Burgers equations characteristics energy estimate

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ON THE CONVERGENCE OF THE NONNESTED V-CYCLE MULTIGRID METHOD FOR NONSYMMETRIC AND INDEFINITE SECOND-ORDER ELLIPTIC PROBLEMS

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Journal of Computational Mathematics 2006年第2期24卷 157-168页

作者： huo-yuan Duan Qun Lin LSEC ICMSEC Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing 100080 China

This paper provides a proof for the uniform convergence rate （independently of the number of mesh levels） for the nonnested V-cycle multigrid method for nonsymmetric and indefinite second-order elliptic problems.

关键词： Nonnested V-cycle multigrid method Second-order elliptic problems.

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Recent advances in theoretical models of respiratory mechanics

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Acta Mechanica Sinica 2012年第1期28卷 1-7页

作者： Bo huo Rui-Rong Fu Key Laboratory of Microgravity&Center for Biomechanicsand Bioengineering Institute of Mechanics Chinese Academy of Sciences100190 BeijingChina

As an important branch of biomedical engineering, respiratory mechanics helps to understand the physiology of the respiratory system and provides fundamental data for developing such clinical technologies as ventilators. To solve different clinical problems, researchers have developed numerous models at various scales that describe biological and mechanical properties of the respiratory system. During the past decade, benefiting from the continuous accumulation of clinical data and the dramatic progress of biomedical technologies （e.g. biomedical imaging）, the theoretical modeling of respiratory mechanics has made remarkable progress regarding the macroscopic properties of the respiratory process, complexities of the respiratory system, gas exchange within the lungs, and the coupling interaction between lung and heart. The present paper reviews the advances in the above fields and proposes potential future projects.

关键词： Respiratory mechanics Biomechanics Gas exchange

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Probing the mechanosensitivity in cell adhesion and migration: Experiments and modeling

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Acta Mechanica Sinica 2013年第4期29卷 469-484页

作者： Bao-Hua Ji Bo huo Biomechanics and Biomaterials Laboratory School of Aerospace Engineering Beijing Institute of Technology

Cell adhesion and migration are basic physiolog- ical processes in living organisms. Cells can actively probe their mechanical micro-environment and respond to the ex- ternal stimuli through cell adhesion. Cells need to move to the targeting place to perform function via cell migration. For adherent cells, cell migration is mediated by cell-matrix adhesion and cell-cell adhesion. Experimental approaches, especially at early stage of investigation, are indispensable to studies of cell mechanics when even qualitative behaviors of cell as well as fundamental factors in cell behaviors are unclear. Currently, there is increasingly accumulation of ex- perimental data of measurement, thus a quantitative formula- tion of cell behaviors and the relationship among these fun- damental factors are highly needed. This quantitative under- standing should be crucial to tissue engineering and biomed- ical engineering when people want to accurately regulate or control cell behaviors from single cell level to tissue level. In this review, we will elaborate recent advances in the ex- perimental and theoretical studies on cell adhesion and mi- gration, with particular focuses laid on recent advances in experimental techniques and theoretical modeling, through which challenging problems in the cell mechanics are sug- gested.

关键词： Cell mechanics ~ Cell adhesion. Cell migration.Modeling ~ Mechanobiology

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Bandgap Properties for the Folded S-Type Periodic Structure:Numerical Simulation and Experiment

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Acta Mechanica Solida Sinica 2023年第5期36卷 624-632页

作者： Tongtong huo Zhijing Wu Fengming Li College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin 150001China

The central wavelength of the first Bragg scattering bandgap is approximately twice that of the ***,a low-frequency Bragg scattering bandgap with a small structural dimension for phononic crystals is difficult to *** this study,a folded S-type periodic structure is developed to reduce the dimension in the direction of vibration suppression by folding unit *** to the foregoing,an improved folded S-type periodic structure with different unit cell arrangements is designed to widen the bandgap frequency *** band diagrams and frequency responses are calculated based on the Bloch theory and using the finite element ***,a prototype of the improved folded S-type periodic structure is fabricated using a three-dimensional printing technique,and a vibration experiment is *** verify the vibration reduction performance of the structure,numerical simulation and experimental results are *** type of folded periodic structure can effectively reduce dimensions to satisfy the dimension requirements pertaining to the direction of vibration ***,the foregoing can aid in promoting the use of elastic bandgap structures in engineering.

关键词： Folded S-type periodic structure Bandgap Vibration reduction Finite element method Vibration experiment

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