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Fundamentals and progress of the manifold method based on independent covers

Science China(Technological Sciences) 2024年第4期67卷 966-991页

作者： SU HaiDong LIN ShaoZhong XIE Zhiqiang GONG Yaqi qi yongfeng Material and Engineering Structure Department Yangtze River Scientific Research InstituteWuhan 430010China Research Center of Water Engineering Safety and Disaster Prevention of Ministry of Water Resources Wuhan 430010China

Aiming to solve mesh generation,computational stability,accuracy control,and other problems encountered with existing numerical methods,such as the finite element method and the finite volume method,a new numerical computational method for continuum mechanics,namely the manifold method based on independent covers(MMIC),is proposed based on the concept of mathematical manifolds,to form partitioned series solutions of partial differential *** partitions,the cover meshes have the characteristics of arbitrary shape,arbitrary connection,and arbitrary *** are expected to fundamentally solve the mesh generation problem and can also simulate the precise geometric boundaries of the CAD model and strictly impose boundary *** the selection of series solutions,local analytical solutions(such as series solutions at crack tips and series solutions in infinite domains)or proper forms of complete series can be used to reflect the local or global characteristics of the physical field to accelerate *** applications are presented.A new method of beam,plate,and shell analysis is *** deformation characteristics of beams,plates,and shells are simulated with polynomial series of suitable forms,and the analysis of curved beams and shells with accurate geometric representation is *** the static elastic analysis of two-dimensional structures,a mesh splitting algorithm is proposed,and h-p version adaptive analysis is carried out with error ***,automatic computation integrated with CAD is *** analysis is also attempted for the solution of differential equations of *** the one-dimensional convection-diffusion equation and Burgers equation,calculation results with high precision are obtained in strong convection and shock wave simulations,avoiding nonphysical *** solving the two-dimensional incompressible Navier-Stokes equation is also *** series solution formula is used to o

关键词： series solutions mesh generation adaptive analysis fixed meshes numerical manifold method

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基于P范数的变尺度扩散公平代价算法

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北京邮电大学学报 2024年第1期47卷 94-99页

作者：火元莲徐天赐齐永锋徐玉荣张印西北师范大学物理与电子工程学院兰州730070 西北师范大学计算机科学与工程学院兰州730070

为了进一步提高扩散式自适应滤波算法在不同噪声环境下的性能,提出了一种新的基于P范数的变尺度扩散公平代价函数算法。该算法在公平代价函数的基础上,对误差绝对值项加入了P范数,同时利用类箕舌线函数构造了一个随误差变化的尺度因子... 详细信息

为了进一步提高扩散式自适应滤波算法在不同噪声环境下的性能,提出了一种新的基于P范数的变尺度扩散公平代价函数算法。该算法在公平代价函数的基础上,对误差绝对值项加入了P范数,同时利用类箕舌线函数构造了一个随误差变化的尺度因子来共同控制算法的陡峭程度,进而使算法拥有更快的收敛速度和更小的稳态误差。在高斯噪声环境以及Alpha稳定分布和伯努利-高斯分布的非高斯噪声环境中的仿真结果表明,所提算法拥有更强的鲁棒性和更低的稳态误差,在不同噪声环境下的性能均优于对比算法。

关键词：自适应滤波分布式变尺度因子 P范数

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高质量发展视野下文化产业人才培养策略研究

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河北开放大学学报 2024年第3期29卷 86-93页

作者：赵朝峰齐勇峰北京开放大学人文与教育学院北京100081 中国传媒大学协同创新中心北京100024

我国文化产业进入高质量发展阶段,文化产业人才的胜任力也随之变化,推动了文化产业人才培养的创新。在“胜任力冰山模型”的理论视野中,我国文化产业人才胜任力构成要素的变化体现在显性因素和隐性因素两个层面。显性因素的变化体现在... 详细信息

我国文化产业进入高质量发展阶段,文化产业人才的胜任力也随之变化,推动了文化产业人才培养的创新。在“胜任力冰山模型”的理论视野中,我国文化产业人才胜任力构成要素的变化体现在显性因素和隐性因素两个层面。显性因素的变化体现在由我国经济科技的发展而引发的文化产业人才的知识和技能的改变;隐性因素的变化体现在由中华民族伟大复兴所引发的文化产业人才的社会角色和动机的改变以及由传统农业文明的文化模式向现代工业文明的文化模式的过渡所引发的文化产业人才的自我认知和特质的改变。这些变化带来的启示表现在高质量发展阶段文化产业人才的培养应形成“推进真善美的和谐统一”的培养目标、“激发出人才的自我教育动机”的培养动力和“构建多元联动机制”的培养策略。

关键词：文创产业高质量发展胜任力冰山模型人才培养

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一种变步长的零吸引归一化自适应滤波算法

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传感技术学报 2024年第7期37卷 1216-1222页

作者：火元莲徐天赐齐永锋徐玉荣柳洁西北师范大学物理与电子工程学院甘肃兰州730070 西北师范大学计算机科学与工程学院甘肃兰州730070

为了使最小均方算法对高斯噪声环境和稀疏系统具有更好的收敛速度和稳态误差,提出了一种变步长的零吸引归一化最小均方算法。该算法将改进的Versoria函数的稀疏感知范数与归一化最小均方算法相结合后,引入了一种新的类高斯函数的变步长... 详细信息

为了使最小均方算法对高斯噪声环境和稀疏系统具有更好的收敛速度和稳态误差,提出了一种变步长的零吸引归一化最小均方算法。该算法将改进的Versoria函数的稀疏感知范数与归一化最小均方算法相结合后,引入了一种新的类高斯函数的变步长策略,解决了固定步长条件下算法收敛速度较慢、跟踪性能较差的问题。从理论层面分析了所提算法的收敛性,并基于MATLAB平台讨论了改进的类高斯步长函数中各参数对算法性能的影响。最后将所提算法与其他同类算法应用于不同信噪比条件下的高斯噪声环境以及稀疏环境中进行未知系统辨识实验,仿真结果表明,所提算法具有更快的收敛速度、更好的跟踪能力以及较小的稳态误差。

关键词：自适应滤波最小均方算法归一化类高斯函数零吸引

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无线传感器网络的鲁棒分布式估计算法

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北京理工大学学报 2024年第9期44卷 980-989页

作者：火元莲刘宝伟岳文斌齐永锋裴东西北师范大学物理与电子工程学院甘肃兰州730070 西北师范大学计算机科学与工程学院甘肃兰州730070 甘肃省智能信息技术与应用工程研究中心甘肃兰州730070

为了提高无线传感器网络在非高斯噪声环境下的分布式估计性能,提出了一种基于半二次准则的变尺度扩散式自适应滤算法,该算法采用了一种凸代价函数的半二次准则(half-quadratic criterion,HQC),使算法可以更加有效地寻找最优解、具有更... 详细信息

为了提高无线传感器网络在非高斯噪声环境下的分布式估计性能,提出了一种基于半二次准则的变尺度扩散式自适应滤算法,该算法采用了一种凸代价函数的半二次准则(half-quadratic criterion,HQC),使算法可以更加有效地寻找最优解、具有更快的收敛速度和更高的滤波精度,并且对脉冲噪声具有更强的鲁棒性.另外,通过引入变尺度因子来平衡和进一步提高算法的收敛速度与稳态误差性能.文中对算法的性能进行了理论分析和仿真对比,结果表明在不同的非高斯噪声环境下,所提算法对未知系统具有更高的辨识效率,其收敛性能和稳态误差性能都优于其他的扩散式自适应滤波算法.

关键词：分布式自适应滤波半二次准则变尺度因子

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Eddy covariance measurements of turbulent fluxes in the surf zone

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Acta Oceanologica Sinica 2020年第3期39卷 63-72页

作者： yongfeng qi Xiaodong Shang Guiying Chen Linghui Yu State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Turbulent eddies play a critical role in oceanic flows. Direct measurements of turbulent eddy fluxes beneath the sea surface were taken to study the direction of flux-carrying eddies as a means of supplementing our understanding of vertical fluxes exchange processes and their relationship to tides. The observations were made at 32 Hz at a water depth of ~1.5 m near the coast of Sanya, China, using an eddy covariance system, which mainly consists of an acoustic doppler velocimeter(ADV) and a fast temperature sensor. The cospectra-fit method-an established semi-empirical model of boundary layer turbulence to the measured turbulent cospectra at frequencies below those of surface gravity waves-was used in the presence of surface gravity waves to quantify the turbulent eddy fluxes(including turbulent heat flux and Reynolds stress). As much as 87% of the total turbulent stress and 88% of the total turbulent heat flux were determined as being at band frequencies below those of surface gravity waves. Both the turbulent heat flux and Reynolds stress showed a daily successive variation;the former peaked during the low tide period and the later peaked during the ebb tide *** of roll-off wavenumbers, k0, and roll-off wavelengths, λ0(where λ0=2π/k0), which were estimated as the horizontal length scales of the dominant flux-carrying turbulent eddies, indicated that the λ0 of the turbulent heat flux was approximately double that of the Reynolds stress. Wavelet analysis showed that both the turbulent heat flux and the Reynolds stress have a close relationship to the semi-diurnal and diurnal tides, and therefore indicate the energy that is transported from tides to turbulence.

关键词： eddy covariance turbulent fluxes surface gravity waves cospectrum tides

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Observations of upper layer turbulent mixing in the southern South China Sea

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Acta Oceanologica Sinica 2015年第11期34卷 6-13页

作者： SHANG Xiaodong qi yongfeng CHEN Guiying LIANG Changrong State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences

A turbulent microstructure experiment was undertaken at a low latitude of 10°N in the South China Sea in late August 2012. The characteristics of the eddy diffusivity above 650 m were analyzed, which is one order of magnitude larger than that in the open ocean at that low latitude. Enhanced eddy diffusivities by strong shears and sharp changes in topography were observed. The strongest eddy diffusivity occurred in the mixed layer, and it reached O（10^-2 m^2/s）. Strong stratification in the thermocline inhibited the penetration of surface eddy diffusivities through the thermocline, where the mixing was weakest. Below the thermocline, where the background eddy diffusivity was approximately O（10^-6 m^2/s）, the eddy diffusivity increased with depth, and its largest value was O（10^-3 m^2/s）.

关键词： southern South China Sea turbulent mixing dissipation rate topography

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Variations of mesoscale eddy SST fronts based on an automatic detection method in the northern South China Sea

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Acta Oceanologica Sinica 2020年第11期39卷 82-90页

作者： Chunhua qiu Juan Ouyang Jiancheng Yu Huabin Mao yongfeng qi Jiaxue Wu Danyi Su School of Marine Sciences Sun Yat-sen UniversityGuangzhou 510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519020China State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

SST fronts at the mesoscale eddy edge(ME fronts)were investigated from 2007–2017 in the northern South China Sea(NSCS)based on an automatic method using satellite sea level anomaly(SLA)and SST *** relative probabilities between the number of anticyclonic/cyclonic ME fronts(AEF/CEF)and the number of anticyclones/cyclones reached 20%.The northeastern and southwestern parts of these anticyclones had more fronts than the northwestern and southeastern parts,although CEFs were nearly equally distributed in all *** number of ME fronts had remarkable seasonal variations,while the eddy kinetic energy(EKE)showed no seasonal *** total EKE at the ME fronts was three times of that within the MEs,and it was much stronger in AEFs than in *** interannual variability in the number of ME fronts and EKE had no significant correlation with the El Ni?o-Southern Oscillation(ENSO)*** mechanisms of ME fronts were discussed,but the contributions of mesoscale eddies to SST fronts need to be quantified in future studies.

关键词： detection method mesoscale eddy SST front northern South China Sea

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Spatial structure of turbulent mixing of an anticyclonic mesoscale eddy in the northern South China Sea

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Acta Oceanologica Sinica 2020年第11期39卷 69-81页

作者： yongfeng qi Chenjing Shang Huabin Mao Chunhua qiu Changrong Liang Linghui Yu Jiancheng Yu Xiaodong Shang State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Shenzhen Key Laboratory of Marine Bioresources and Eco-environmental Science College of Life Science and OceanographyShenzhen UniversityShenzhen 518060China Ocean College Zhejiang UniversityZhoushan 316021China The Center for Coastal Ocean Science and Technology School of Marine SciencesSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of SciencesShenyang 110016China

Upper turbulent mixing in the interior and surrounding areas of an anticyclonic eddy in the northern South China Sea(SCS)was estimated from underwater glider data(May 2015)in the present study,using the Gregg-HenyeyPolzin parameterization and the Thorpe-scale *** observations revealed a clear asymmetrical spatial pattern of turbulent mixing in the anticyclonic eddy *** diffusivity(in the order of 10–3 m2/s)was found at the posterior edge of the anticyclonic mesoscale eddy;on the anterior side,diffusivity was one order of magnitude lower on *** asymmetrical pattern was highly correlated with the eddy kinetic *** shear variance on the posterior side,which is conducive to the triggering of shear instability,may be the main mechanism for the elevated *** addition,the generation and growth of sub-mesoscale motions that are fed by mesoscale eddies on their posterior side may also promote the occurrence of strong mixing in the studied *** results of this study help improve our knowledge regarding turbulent mixing in the northern SCS.

关键词： mesoscale eddy turbulent mixing South China Sea GHP parameterization Thorpe-scale method

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电解锰渣基活性胶凝材料的制备与性能研究

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绿色矿冶 2024年第1期40卷 14-20页

作者：陈曦代文彬祁永峰王书晓陈学刚中国恩菲工程技术有限公司北京100038

为促进电解锰渣的无害化、减量化、资源化处置,提高电解锰渣在水泥等建材行业的大宗消纳水平,本文针对国内某厂的电解锰渣,探索了脱氨脱硫提铁工艺的系列参数,采用电解锰渣原渣、脱硫锰渣和还原提铁锰渣制备活性胶凝材料,并对比活性指... 详细信息

为促进电解锰渣的无害化、减量化、资源化处置,提高电解锰渣在水泥等建材行业的大宗消纳水平,本文针对国内某厂的电解锰渣,探索了脱氨脱硫提铁工艺的系列参数,采用电解锰渣原渣、脱硫锰渣和还原提铁锰渣制备活性胶凝材料,并对比活性指数。结果表明,电解锰渣的氨含量和硫含量均随焙烧温度的升高而降低,当温度为400℃时,渣中残氨含量为0.09%,脱氨率大于90%,在温度600℃条件下保温焙烧10 min,脱氨率大于98%;在温度1 300℃条件下焙烧,电解锰渣含硫量可降至1%以下,脱硫率大于96%;该脱硫锰渣经配入辅剂后,在温度1 500℃条件下保温5 min,渣中Fe含量可降至1%以下,达到较为理想的提铁效果。电解锰活性较差,无法通过物理和化学激发的方法达到S75级矿渣粉标准;脱硫锰渣经提高比表面积或配加激发剂混磨后可满足S75矿渣粉的要求;还原提铁锰渣具备良好的活性,粉磨后可直接用于水泥混合材等建材产品,掺入量可达50%,有利于电解锰渣的大宗消纳。

关键词：有色金属冶金电解锰渣活性微粉机械活化化学激发

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