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1,943 results on '"Guo Jiao"'

1. Understanding the characteristics of loess strata and quaternary climate changes in Luochuan, Shaanxi Province, China, through core analysis

Author

Guo Jiao, Shi Jiansheng, Song Chao, Dong Qiuyao, and Wang Wei

Subjects
paleoclimate, loess characteristics, paleomagnetism, magnetic susceptibility, particle size, loss on ignition, Geology, QE1-996.5
Abstract

Profile sampling, which causes missing or overlapping horizons, has been generally used while studying loess stratigraphy and paleoclimate. Conversely, drill sampling of thick loess can provide a relatively complete and actual record of the Quaternary climate and environmental changes. Here, paleomagnetic chronological analysis and particle size and magnetic susceptibility analyses were performed to accurately reveal the loess stratigraphy characteristics of Luochuan loess tableland in Fu County, Shaanxi Province, China. The FX core revealed that the Quaternary loess layer was 167.03 m thick and consisted of 33 layers of developed loess/paleosol sequences and 37 loess/paleosol assemblages. The paleosol horizons indicated relatively warm and humid climatic period, while loess/sand reflected cold and arid climate. Since 2.6 Ma, the climate of the region has undergone 37 warm and cold cycles trending toward an increasingly dry and cold climate. During this time, 10 paleoclimate cycles occurred during 2.6–1.6 Ma, 15 climate cycles occurred during 1.6–0.8 Ma, and 12 loess–paleosol cycles have occurred from 0.8 Ma to the present day. Our study provides a basis for accurately and comprehensively interpreting the paleoclimate and paleoenvironment during loess deposition formation.

Published
2023
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2. MRIo3DS-Net: A Mutually Reinforcing Images to 3D Surface RNN-like framework for model-adaptation indoor 3D reconstruction

Author

Li, Chang, Guo, Jiao, Zhao, Yufei, and Zhang, Yongjun

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

This paper is the first to propose an end-to-end framework of mutually reinforcing images to 3D surface recurrent neural network-like for model-adaptation indoor 3D reconstruction,where multi-view dense matching and point cloud surface optimization are mutually reinforced by a RNN-like structure rather than being treated as a separate issue.The characteristics are as follows:In the multi-view dense matching module, the model-adaptation strategy is used to fine-tune and optimize a Transformer-based multi-view dense matching DNN,so that it has the higher image feature for matching and detail expression capabilities;In the point cloud surface optimization module,the 3D surface reconstruction network based on 3D implicit field is optimized by using model-adaptation strategy,which solves the problem of point cloud surface optimization without knowing normal vector of 3D surface.To improve and finely reconstruct 3D surfaces from point cloud,smooth loss is proposed and added to this module;The MRIo3DS-Net is a RNN-like framework,which utilizes the finely optimized 3D surface obtained by PCSOM to recursively reinforce the differentiable warping for optimizing MVDMM.This refinement leads to achieving better dense matching results, and better dense matching results leads to achieving better 3D surface results recursively and mutually.Hence, model-adaptation strategy can better collaborate the differences between the two network modules,so that they complement each other to achieve the better effect;To accelerate the transfer learning and training convergence from source domain to target domain,a multi-task loss function based on Bayesian uncertainty is used to adaptively adjust the weights between the two networks loss functions of MVDMM and PCSOM;In this multi-task cascade network framework,any modules can be replaced by any state-of-the-art networks to achieve better 3D reconstruction results.

Published
2024

9. Light‐Enhanced Suzuki–Miyaura Crosscoupling Reaction by Polyoxopalladates Clusters: Doping Effect

Author

Huiyong Li, Ye Liu, Amin Abdolrahimi, Xin‐Guo Jiao, Xiao‐He Liu, and Yu Wang

Subjects
charge distributions, doping effects, polyoxopalladates, Suzuki–Miyaura crosscoupling, Environmental technology. Sanitary engineering, TD1-1066, Renewable energy sources, TJ807-830
Abstract

Atomic precise clusters play a pivotal role in elucidating catalytic mechanisms. Emerging well‐defined noble metal oxygen clusters, such as polyoxopalladates (POPs), present promising prospects as ideal model catalysts for comprehensively understanding the molecular mechanisms underlying noble metal‐based catalysis. Herein, modified SBA‐15 serves as a substrate for loading three distinct POP clusters, thus forming heterogeneous catalysts for the Suzuki–Miyaura crosscoupling reaction. It is revealed that the copper‐doped cluster shows better performance than the Fe‐ and Co‐doped clusters due to the relatively high electronegativity of copper. Interestingly, all catalysts demonstrate enhanced performance under light illumination. density functional theory calculation suggests that an electron transfer from the bridging ligands to the Pd atoms takes place under illumination, which facilitates the reactions.

Published
2024
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11. Antioxidant ofsmallmolecular weightchitosan oligosaccharidein vitro

Author

Kong Shang, Cao Peiqiu, Guo Jiao, and Su Zhengquan

Subjects
Microbiology, QR1-502, Physiology, QP1-981, Zoology, QL1-991
Abstract

In recent years, there has been increasing interest in finding natural antioxidants, since they can protect the human body from free radicals and retard the progress of many chronic diseases. This study is to evaluate antioxidant of a certain molecular chitosan oligosaccharide (Mw 1000 Da, COST) in vitro. The antioxidant activities of COST were investigated in vitro by several antioxidant assays, including DPPH radical scavenging, hydroxyl radical scavenging, superoxide radical scavenging, reducing power and metal chelating activities.In vitro studies found that COST had noticeable scavenging activities on 2,2-diphenyl-1-picryl-hydrazyl (DPPH) radical, hydroxyl radical, and superoxide anion, and possessed reducing power and metal chelating activities, and its capability of anti-oxidation enhance with the increase of concentration.COST presents anexcellent biological rolein scavenging free radical, which could be explored as a potential antioxidant or dietary supplement to retard diseases caused by peroxide.

Published
2017
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20. Viscous infuences on jetting process from an impacted concave free surface

Author

Cheng, Xiang-Gang, Chen, Xiao-Peng, Ding, Hang, Zhang, Chun-Yu, Guo, Jiao-Jiao, and Jia, Lai-Bing

Subjects
Physics - Fluid Dynamics
Abstract

A focused jet is generated from a concave free surface through an impact of a tube. Experimental and numerical studies were conducted to explore the viscous influences. The results show that a strong vorticity sheet is generated along the free surface just after impact, and the liquid bulk is initialized ($t\le$$10^{-4}$s). After the impact, the liquid surface evolves freely and a jet is ejected ($t\gg$$10^{-4}$s). Pronounced tangential flow is found, and the material in the jet mainly originates from the viscous penetrating layer below the free surface. According to the above observations, a vorticity mechanism of the free surface evolution is proposed. Further, by combining the viscous and interfacial tension effects, a scaling relation estimating the jetting velocity is derived, which agrees with the numerical and experimental results well. The work will be valuable for viscous droplets preparation., Comment: 13 pages, 7 figures

Published
2022

39. Research on Civic Education for Students Based on the Curriculum Cultivation System of Higher Education Institutions

Author

Ding, Feng, Lei, Daohai, Guo, Jiao, Striełkowski, Wadim, Editor-in-Chief, Black, Jessica M., Series Editor, Butterfield, Stephen A., Series Editor, Chang, Chi-Cheng, Series Editor, Cheng, Jiuqing, Series Editor, Dumanig, Francisco Perlas, Series Editor, Al-Mabuk, Radhi, Series Editor, Scheper-Hughes, Nancy, Series Editor, Urban, Mathias, Series Editor, Webb, Stephen, Series Editor, Khan, Intakhab Alam, editor, Ramaswamy, Ganesan, editor, and Hussin, Zaharah Binti, editor

Published
2023
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