Article
Computer Science, Interdisciplinary Applications
Cong Xiao, Olwijn Leeuwenburgh, Hai Xiang Lin, Arnold Heemink
Summary: A reduced order modeling algorithm is proposed for estimating space varying parameter patterns in numerical models. Domain decomposition is used to construct separate approximations in each subdomain, with a new local parameterization to decouple computational cost from global principal components. This approach drastically reduces the number of full order simulations needed for deriving reduced order models, with optimal local parameter patterns projected onto global patterns to avoid non-smoothness at subdomain boundaries.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Computer Science, Interdisciplinary Applications
Konstantin Lipnikov, Mikhail Shashkov
Summary: Conservative and bounds-preserving method is developed for accurate remapping of discrete fields on generalized polygonal meshes with curvilinear edges in ALE hydrodynamics simulations. The proposed method's properties are studied theoretically and numerically for various mesh deformations and discrete fields representing smooth and discontinuous functions.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Environmental Sciences
Brian T. Dinkelacker, Pablo Garcia Rivera, Julian D. Marshall, Peter J. Adams, Spyros N. Pandis
Summary: Machine learning approaches were used to downscale coarse-resolution CTM predictions to high spatial resolutions, successfully predicting PM2.5 concentrations and source contributions in southwestern Pennsylvania in February and July 2017. The best performing model was a random forest model, which accurately reproduced PM2.5 concentrations for all components and sources.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Environmental Sciences
Minah Bae, Byeong-Uk Kim, Hyun Cheol Kim, Jung Hun Woo, Soontae Kim
Summary: A method is proposed to adjust the contributions of upwind emissions to downwind PM2.5 concentrations by accounting for observed and simulated differences. The adjustment method can reduce uncertainties in emissions inventories and provide a better understanding of the contributions from local and upwind emissions to downwind PM2.5 concentrations.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Computer Science, Interdisciplinary Applications
Ziyao Xu, Chi -Wang Shu
Summary: This study is a follow-up work that improves and extends the positivity-preserving discontinuous Galerkin methods for stationary hyperbolic equations. Previous methods were only applicable to equations with constant coefficients and achieved second order accuracy. In this study, we propose high order positivity-preserving DG methods for one-dimensional variable coefficient and nonlinear equations, as well as two and three-dimensional stationary hyperbolic equations with constant coefficients. The algorithms are validated through extensive numerical experiments.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Mathematics, Applied
Zhe Liu, Ying Yang
Summary: High-order uncertain differential equations are widely used in modeling dynamic systems in uncertain environments, often requiring estimation of unknown parameters through discrete observations. This study proposes moment estimations for unknown parameters using the Euler method approximation and deriving a system of equations by matching sample moments with corresponding population moments. Several examples illustrate the method in detail.
APPLIED MATHEMATICS AND COMPUTATION
(2022)
Article
Mathematics, Applied
Jeffrey M. Connors, Robert D. Dolan
Summary: This paper discusses the stability of high-order time integration for two fluids coupled across an interface. An iterative approach is proposed that achieves stability, multirate capabilities, flux conservation, and high-order accuracy without time step restrictions.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2022)
Article
Engineering, Multidisciplinary
Nuo Lei, Juan Cheng, Chi-Wang Shu
Summary: This paper presents a high-order accurate positivity-preserving conservative remapping algorithm based on WENO reconstruction, which has been demonstrated through a series of numerical experiments to be conservative, positivity-preserving, and efficient.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Multidisciplinary
Nuo Lei, Juan Cheng, Chi-Wang Shu
Summary: We propose a high-order positivity-preserving conservative remapping method on 3D tetrahedral meshes based on the weighted essentially non-oscillatory reconstruction method. By accurately calculating the overlaps between meshes, our method allows for wider range of mesh movements and simplifies the remapping process. Utilizing the third order multi-resolution WENO reconstruction procedure, we distribute nonlinear weights based on the smoothness of polynomials to achieve optimal accuracy and avoid numerical oscillations. Our method also incorporates efficient local limiting to preserve positivity without compromising high-order accuracy and conservation. Numerical tests confirm the properties of our remapping algorithm, such as high-order accuracy, conservation, non-oscillatory performance, positivity-preserving, and efficiency.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Oceanography
Yunfei Du, Daosheng Wang, Jicai Zhang, Ya Ping Wang, Daidu Fan
Summary: An improved numerical scheme is developed to estimate the initial conditions based on a three-dimensional suspended sediment transport model with adjoint data assimilation, and applied to Hangzhou Bay. The results show that the conjugate descent algorithm of Fletcher is the most effective in estimating the ICs, and the estimated ICs are sensitive to initial guess values and observation errors.
CONTINENTAL SHELF RESEARCH
(2021)
Article
Energy & Fuels
Dan Gabriel Cacuci
Summary: This work introduces a new methodology for efficiently computing second-order sensitivities of model responses to functions of uncertain model parameters. By enabling the computation of exact expressions of second-order sensitivities of model responses to model features, the number of required large-scale adjoint computations is greatly reduced, resulting in unmatched efficiency.
Article
Computer Science, Interdisciplinary Applications
Yujie Liu, Yue Feng, Ran Zhang
Summary: This article introduces a high-order conservative flux optimization finite element method for convection-diffusion equations, which preserves mass conservation locally. The method is based on constrained minimization and has fewer degrees of freedom with super-closeness to the finite element solution. Convergence is verified and significant advantages of the high-order scheme are demonstrated through numerical studies.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mathematics, Applied
Marina Medvedeva, Theodore E. Simos, Charalampos Tsitouras, Vasilios Katsikis
Summary: The SIR model is used for infectious disease modeling, and parameter estimation through least squares approach shows the simplicity and accuracy of the method.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2021)
Article
Environmental Sciences
Wenrui Chen, Daosheng Wang, Xiujuan Liu, Jun Cheng, Jicai Zhang
Summary: This study aims to improve the accuracy of modeling suspended sediment concentrations using newly developed techniques. By assimilating retrieved suspended sediment concentrations with a three-dimensional transport model and the adjoint data assimilation method, the study shows that the penalty function method can significantly enhance the effect of data assimilation and improve simulation accuracy.
Article
Energy & Fuels
Gleison Fransoares Vasconcelos Amaral, Joao Marcos Rabelo Baccarini, Francisco Carlos Rodrigues Coelho, Lane Maria Rabelo
Summary: This study proposes an analytical, non-iterative methodology for estimating the equivalent circuit parameters of a three-phase induction machine, which has been found to be effective in a wide power range. By comparing with two other estimation methods, it is shown that the proposed method generally achieves lower errors.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2021)
Article
Biochemistry & Molecular Biology
Fei-Fei Geng, Zhe Jiang, Yong-Hu Chen, Ning Li, Xue-Zheng Li
Summary: A chemical investigation of Angelica acutiloba identified 26 compounds, including 11 coumarins, 11 phthalides, one sterol, two polyacetylenes, and one bisbenzopyran. Several of these compounds were isolated for the first time from specific sources.
BIOCHEMICAL SYSTEMATICS AND ECOLOGY
(2023)
Article
Agricultural Engineering
Ning Yang, Xueru Sheng, Liting Ti, Haiyuan Jia, Qingwei Ping, Ning Li
Summary: This paper investigates the ball-milling process for biodiesel production using Kraft lignin activated carbon stabilized K2CO3. The biodiesel yield increased to 66% within 5 minutes and reached 100% within 25 minutes under optimal ball-milling conditions. Additionally, the power demand of the ball-milling method was found to be lower than the traditional thermocatalytic method. Therefore, the ball-milling method is an effective and economical process for biodiesel production.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Xiaojuan Chen, Yu Zhou, Jiesen Li, Suresh C. Pillai, Nanthi Bolan, Juhua He, Ning Li, Song Xu, Xin Chen, Qinghua Lin, Hailong Wang
Summary: Biochar obtained from pyrolysis of biomass waste has the potential to be used in wastewater treatment due to its large surface area and active sites. In this study, biochar was prepared from sorghum straw and its adsorption kinetics towards tartrazine was investigated. The optimized biochar was also used as a catalyst for peroxydisulfate activation to degrade tartrazine. The degradation pathways and reactive substances were analyzed, showing the potential ecological benefits of this catalytic system.
ENVIRONMENTAL POLLUTION
(2023)
Article
Chemistry, Multidisciplinary
Ning Li, Tiantian Zhang, Zuliang Wu, Jing Li, Wei Wang, Jiali Zhu, Shuiliang Yao, Erhao Gao
Summary: The synergistic effects of Sn and Ag in the 1Sn5Ag/gamma-Al2O3 catalyst greatly enhance its C3H6-SCR performance. The presence of AgCl crystallites helps maintain an appropriate redox ability and suppresses over-oxidation of C3H6. The coexistence of Ag and Sn increases the reactivity of surface adsorbed oxygen and hydroxyl groups, and the electron transfer effects increase the ratio of Ag-0/Ag+.
Article
Engineering, Aerospace
Xibin Cao, Ning Li, Shi Qiu, Chaoyong Li
Summary: This paper proposes a scheduling method based on grids coding for searching and tracking time-sensitive targets in a region. It assesses the observation problem and constructs a grids coding model for observation resources and tasks. A dynamic updating process of probability is established, taking into account the movement of the time-sensitive target, and a dynamic prediction model of target position is founded, considering the unpredictability of the time-sensitive target model. Ultimately, a mega-constellation searching technique is developed with the enhancement of information entropy of covering grids as the objective function.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Zhihao Zhang, Meng Li, Tong Yang, Zixi Zang, Ning Li, Ronger Zheng, Jinjia Guo
Summary: Research on the transient variation processes of oceanic dissolved CO2 is significant due to the complexity and dynamics of the marine environment. However, the response performance limitation of in situ sensors poses challenges. This study presents a novel system solution that overcomes this limitation, enabling high-performance detection with a seconds-scale response, sub-ppmv level precision, and 3000 m rated depth. By improving the response performance of the sensor, the water mixing process and concentration variation profile can be accurately portrayed, offering insights into carbon cycle research in deep-sea unstable regions.
ANALYTICAL CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Xingfan Gong, Jiacheng Xu, Tiantian Zhang, Yan Sun, Shiyu Fang, Ning Li, Jiali Zhu, Zuliang Wu, Jing Li, Erhao Gao, Wei Wang, Shuiliang Yao
Summary: Cu-doped manganese oxide (Cu-Mn2O4) prepared using aerosol decomposition showed excellent CO oxidation performance. The 0.5Cu-Mn2O4 catalyst with a hollow sphere morphology and high Mn3+, Cu+, and Oads ratios exhibited the best CO oxidation activity, with low T-50 and T-90 values. DRIFTS-MS analysis revealed that terminal-type oxygen (M=O) and bridge-type oxygen (M-O-M) on 0.5Cu-Mn2O4 were reactive at low temperatures and water had limited inhibitory effects on CO oxidation.
Article
Construction & Building Technology
Ning Li, Zuquan Jin, Kai Shen, Guangcheng Long, Yong Yu, Qiang Fu, Chuansheng Xiong, Bo Pang, Xiaoying Zhang
Summary: Three strategies, including rubber particles, steel fibers, and asphalt-coated coarse aggregate, were introduced to enhance the impact resistance of self-compacting concrete after freeze-thaw cycles. The impact compression properties of the modified concrete were evaluated using a split Hopkinson pressure bar. Modifying materials showed a significant strain rate effect on the dynamic properties of the concrete. The addition of modifying materials resulted in a lower decrease in the fineness modulus of residue and an improved impact toughness index, indicating reduced damage caused by freeze-thaw cycles and enhanced impact resistance.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Marine
Yuchang Zhi, Jiemin Zhan, Renfang Huang, Yiwei Wang, Ning Li
Summary: This paper investigates the dynamic behavior of ventilated supercavities considering the effect of the free surface through numerical simulations. The presence of the free surface affects the length and diameter of the ventilated cavity, as well as the vertical velocity distribution between the free surface and the cavity. Two typical gas leakage mechanisms, namely the twin-vortex tube leakage mode and the re-entrant jet leakage mode, were observed at different immersion depths. The internal flow field of the ventilated supercavity can be classified into three regions: the internal boundary layer, the ventilation influence region, and the reverse flow region. The ventilated supercavity is influenced by both the free surface effect and the gravity effect as the distance between the free surface and the cavity decreases.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Chemistry, Medicinal
Heng Zhang, Xiao Guo, Di Zhou, Jiatong Wen, Yingzhan Tang, Jian Wang, Yang Liu, Gang Chen, Ning Li
Summary: In this study, a visible-light-induced intermolecular [2 + 2] photocycloaddition reaction was used to synthesize 20 derivatives of (perpendicular to)-millpuline A for bioactivity evaluation. The protective effects of (+/-)-millpuline A and compound B13a against NNK-induced lung cell injury were revealed. The target of (+/-)-millpuline A was determined to be SRC protein, and its inhibitory effect on SRC activity was demonstrated through a transcriptional mechanism. These findings provide valuable insights for the further development of flavonoids and understanding the bioactivity and mechanism of (+/-)-millpuline A.
Article
Materials Science, Composites
Ning Li, Saeed Ahmed Khan, Kun Yang, Kai Zhuo, Yixia Zhang, Hulin Zhang
Summary: A thermogalvanic organohydrogel electrolyte (OHE) was developed with Sn2+/Sn4+ as a redox couple and NaCl as an additional electrolyte, enabling interactions between visually impaired people, normal people, and auxiliary devices. The OHE exhibits favorable mechanical and thermoelectric performances, with a high Seebeck coefficient of -1.62 mV/K. It can withstand harsh environments with its anti-freezing, non-drying properties and wide working temperature range (-20 to 60 degrees C), and was successfully integrated into a self-powered Braille transmission interface for real-time Braille transmission and readout.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Computer Science, Information Systems
Bing Xia, Shengpu Li, Ning Li, Hong Li, Xuguang Tian
Summary: This study improves the Serre standard model and proposes a method to effectively identify the surface defects of solar panels. By combining pre-processing and binary image processing, the features of solar panels are obtained and classified using the improved model, achieving high accuracy in defect recognition.
Article
Engineering, Electrical & Electronic
Jiang Mai, Sha Guijun, Li Ning
Summary: This paper proposes an infrared and visible image fusion algorithm based on guided filter and dual-tree complex wavelet transform, which overcomes the limitations of traditional image fusion algorithms and improves target clarity, edge and texture details, and contrast. The visible and high-frequency infrared image components are enhanced using guided filter, based on the characteristics of infrared and visible images. Then, an algorithm based on saliency adaptive weighting rules is used to fuse low-frequency subband components, and a rule based on Laplace energy sum and gradient value vector is used to fuse high-frequency subbands at different scales and directions. Finally, the fused coefficients are inverted using dual-tree complex wavelet transform to obtain the final reconstructed image. Experimental results demonstrate the improved performance of the proposed algorithm in terms of objective evaluation indicators, with clear target features, background texture, edge details, and appropriate overall contrast.
LASER & OPTOELECTRONICS PROGRESS
(2023)
Review
Chemistry, Multidisciplinary
Xiaoyu Zhang, Ning Li, Guorui Wang, Chi Zhang, Yu Zhang, Fanglei Zeng, Hailong Liu, Gang Yi, Zhongwei Wang
Summary: Flexible human body electronic sensors with flexibility, extensibility, and responsiveness are highly desirable. Polysiloxane materials have become the preferred choice as a flexible matrix for their good affinity towards the human body.
Proceedings Paper
Computer Science, Artificial Intelligence
Liying Yu, Peng Wang, Zhe Chen, Dewen Li, Ning Li, Rachid Cherkaoui
Summary: This paper presents a distributed shadow dynamic consensus (DSDC) framework to address the generation company (GENCO) strategic bidding problem in the independent system operator (ISO) operation. The framework uses a distributed dynamic consensus algorithm to estimate the general equality constraint and obtain optimal locational marginal prices (LMP) and power allocation. The proposed framework is tested using the IEEE 30-bus test system.
2023 IEEE PES CONFERENCE ON INNOVATIVE SMART GRID TECHNOLOGIES, ISGT MIDDLE EAST
(2023)
