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803 results on '"Guo, Xiaoxia"'

12. A note on perturbation analysis for T-product based tensor singular values

Author

Zhang, Yating, Guo, Xiaoxia, and Xie, Pengpeng

Subjects
Mathematics - Numerical Analysis
Abstract

In this note, we present perturbation analysis for the T-product based tensor singular values defined by Lu et al. First, the Cauchy's interlacing-type theorem for tensor singular values is given. Then, the inequalities about the difference between the singular values of two matrices proposed by Mirsky are extended to tensor cases. Finally, we introduce some useful inequalities for the singular values of tensor products and sums.

Published
2021

19. CS decomposition and GSVD for tensors based on the T-product

Author

Zhang, Yating, Guo, Xiaoxia, Xie, Pengpeng, and Cao, Zhengbang

Subjects
Mathematics - Numerical Analysis
Abstract

This paper derives the CS decomposition for orthogonal tensors (T-CSD) and the generalized singular value decomposition for two tensors (T-GSVD) via the T-product. The structures of the two decompositions are analyzed in detail and are consistent with those for matrix cases. Then the corresponding algorithms are proposed respectively. Finally, T-GSVD can be used to give the explicit expression for the solution of tensor Tikhonov regularization. Numerical examples demonstrate the effectiveness of T-GSVD in solving image restoration problems.

Published
2021

24. Effect of dietary intervention on intestinal flora in diabetes mellitus rats

Author

Zhang Ranran and Guo Xiaoxia

Subjects
high-fat diet, diabetic rats, low-fat diet, gut microbiota, metabolic pathways, Medicine, Biotechnology, TP248.13-248.65
Abstract

Objective The aim of this study was to observe the changes of glucolipid metabolic indexes and intestinal flora structure in high-fat diet combined with streptozotocin-induced diabetic rats, and the effect of lowfat diet on their intervention. Methods The rats fed with normal diet and high-fat diet were used as the control and model groups, respectively, and were subjected to low-fat diet intervention for 8 weeks. Body weights of all rats were recorded, orbital blood was taken from the rats to detect glucolipid metabolism indexes, and feces were retained for the detection of intestinal microbial diversity before and after the start of the experiment. Results In the experimental group, weight and LDL-C decreased significantly after the low-fat diet intervention, and the difference was statistically significant (P0.05). The phylum Bacteroidetes and Actinobacteria were elevated in diabetic rats, and the TM7 and Firmicutes/Bacteroidetes ratio were significantly higher after low-fat diet control. The key genera in diabetic rats were Prevotella and Bacteroides, but they changed to Ruminococc and Clostridium after the low-fat diet intervention. The key pathways of low-fat diet intervention were lipopolysaccharide biosynthesis, glycosaminoglycan degradation, other glycan degradation, and sphingolipid metabolis. Conclusion Low-fat diet significantly reduces body weight and alters intestinal flora structure in diabetic rats. Low-fat diet may interfere with the progression of diabetes by altering intestinal lipid metabolic pathways.

Published
2023
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44. 53BP1 regulates heterochromatin through liquid phase separation

Author

Zhang, Lei, Geng, Xinran, Wang, Fangfang, Tang, Jinshan, Ichida, Yu, Sharma, Arishya, Jin, Sora, Chen, Mingyue, Tang, Mingliang, Pozo, Franklin Mayca, Wang, Wenxiu, Wang, Janet, Wozniak, Michal, Guo, Xiaoxia, Miyagi, Masaru, Jin, Fulai, Xu, Yongjie, Yao, Xinsheng, and Zhang, Youwei

Published
2022
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46. Life-Cycle Cost Assessment of the Base-Isolated-Reinforced Concrete Structure.

Author

Wang, Hao, Guo, Xiaoxia, Luo, Chao, Zhao, Jun, and Feng, Huaiping

Subjects
*PRODUCT life cycle assessment, *COST structure, *BUSINESS losses, *INCOME, *REAL estate business
Abstract

Seismic isolation structures have excellent seismic mitigation effects, but implementing isolation measures may increase the initial cost of the structure. This paper presents a method to calculate the seismic loss and assess the life-cycle cost of isolated structures, which is convenient for owners to make decisions. The life-cycle cost assessment model is divided into two parts: initial cost assessment and seismic loss assessment over life-cycle period. Among them, the assessment method of the isolation layer is proposed, including the cost assessment of isolation bearings and dampers. The assessment method of seismic loss considers direct loss, indirect loss, casualties and integrating casualties into a unified assessment system. Direct loss includes building loss, indirect loss includes rental loss, relocation loss, income loss, personal property loss and business inventory loss. The seismic loss model is associated with seismic damage probability, which is obtained through seismic vulnerability and seismic probability risk assessment. The 8-story base-isolated-reinforced concrete structure illustrates the feasibility of the life-cycle-cost assessment model. The example shows that the initial cost of the isolated structure exceeds that of the nonisolated structure, however, the rental loss, income loss, personal property loss and casualties are much lower than those of nonisolated structures. The income loss of the isolated structure is the maximum proportion in life-cycle cost, and the casualty loss is the minimum proportion in the seismic loss, due to its excellent seismic mitigation effects. [ABSTRACT FROM AUTHOR]

Published
2024
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47. Three dimensional stress and strain state of the offshore fill during the one-dimensional consolidation process.

Author

Chen, Zhixiang, Hua, Longfei, Wan, Yong, Guo, Xiaoxia, Zhang, Ke, and Li, Shunqun

Subjects
SOIL consolidation, SOIL mechanics, SHEAR strain, MARINE engineering, STRAINS & stresses (Mechanics)
Abstract

Evaluating the filling soil strain and stress behaviors during offshore reclamation and consolidation processes is crucial in forming a stable marine engineering foundation. While, the one-dimensional stress-strain testing technology cannot reflect the three-dimensional (3D) characteristics of the large site, which poses a potential disaster to the uneven settlement of the site. In this study, we construct a platform for 3D testing of strain and stress state during soil consolidation process on the basis of the novel 3D strain rosette and 3D earth stress sensor. Subsequently, the platform was used in a consolidation model test of the Dalian Offshore Airport filling soil, which consists of red clay and stone powder in a mass ratio of 1:4. The results indicate that self-weight consolidation mainly involves an increase in isotropic spherical strain, while load consolidation results in significant shear strain. During soil consolidation process, stress increases first and then dissipates, while vertical compression occurs due to the self-weight of the soil. The evolution law of the principal strain is direction-independent, whereas that of the principal stress remains comparatively stable when the principal stress increases steadily. This study provides a reference for the consolidation deformation and soil strength evaluation of soil fill. [ABSTRACT FROM AUTHOR]

Published
2024
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