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230 results on '"Ma, Tianxiao"'

13. Seismic Fragility Analysis of Arch Dam Based on IDA and ETA Methods.

Author

Ma, Tianxiao, Zhang, Liaojun, Xu, Wei, Zhang, Hanyun, Wang, Weiqiang, Wang, Yi, and Kontoni, Denise-Penelope

Subjects
*HYDRAULIC structures, *GROUND motion, *EARTHQUAKE resistant design, *STRUCTURAL models, *BEDROCK, *ARCH dams
Abstract

In the assessment of the seismic performance of ultrahigh‐arch dams, challenges such as complex structural models, extensive degrees of freedom, and extended computation times are commonly encountered. Consequently, there is a pressing need to develop a more streamlined and effective approach for investigating the seismic behavior of ultrahigh‐arch dams. The endurance time method, a novel approach in seismic analysis, is increasingly favored for the dynamic analysis of large structures. In this study, the dynamic damage characteristics of an ultrahigh‐arch dam are analyzed based on the endurance time method, and the seismic fragility analysis is evaluated. Utilizing a case study of an ultrahigh‐arch dam in southwest China, a comprehensive three‐dimensional nonlinear model encompassing dam, bedrock, and water interactions is developed. This model incorporates considerations of dam and bedrock damage, cracking, dynamic behavior of contraction joints, and the interaction between the dam and reservoir water. The nonlinear least‐squares function is used to generate three endurance time acceleration functions (ETAFs) based on the response spectra of the hydraulic structure seismic design standard. The dynamic analysis of the above model is carried out by using the endurance time method and the incremental dynamic analysis (IDA) method. The results indicate that the endurance time method can well reflect the fragility of ultrahigh‐arch dams under different intensities of ground motions, with significant computational efficiency. [ABSTRACT FROM AUTHOR]

Published
2024
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27. Editorial: Biodiversity conservation and sustainable development of protected areas.

Author

Wang, Wei, Ma, Tianxiao, Russo, Isa-Rita, Sang, Weiguo, and Li, Binbin V.

Subjects
BIODIVERSITY conservation, SUSTAINABLE development, PROTECTED areas, BIODIVERSITY, SCIENTIFIC method, NATIONAL park conservation, RESTORATION ecology
Abstract

This document is an editorial discussing the importance of biodiversity conservation and sustainable development in protected areas (PAs). The Kunming-Montreal Global Biodiversity Framework has set a target of protecting and managing 30% of the world's terrestrial and marine areas by 2030. The editorial highlights the need to integrate conservation efforts with regional development and explores strategies for promoting a harmonious model of human-land interaction. The document summarizes 11 articles published under the Research Topic, which cover topics such as the spatial layout of PAs, conservation status and effectiveness, the relationship between conservation measures and ecosystem changes, and the attitudes and perceptions of local communities. The studies emphasize the importance of effective management measures and maintaining a balance between conservation and sustainable development in PAs. [Extracted from the article]

Published
2024
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34. Compensatory dynamics drive grassland recovery from drought

Author

Luo, Wentao, primary, Ma, Wang, additional, Song, Lin, additional, Te, Niwu, additional, Chen, Jiaqi, additional, Muraina, Taofeek O., additional, Wilkins, Kate, additional, Griffin‐Nolan, Robert J., additional, Ma, Tianxiao, additional, Qian, Jianqiang, additional, Xu, Chong, additional, Yu, Qiang, additional, Wang, Zhengwen, additional, Han, Xingguo, additional, and Collins, Scott L., additional

Published
2023
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36. Risk Factors Analysis of Phantom Limb Pain in Amputees with Malignant Tumors

Author

Huo,Xiulin, Huang,Peiying, Di,Hexuan, Ma,Tianxiao, Jiang,Sufang, Yao,Jie, Huang,Lining, Huo,Xiulin, Huang,Peiying, Di,Hexuan, Ma,Tianxiao, Jiang,Sufang, Yao,Jie, and Huang,Lining

Abstract

Xiulin Huo,1,2 Peiying Huang,1 Hexuan Di,3 Tianxiao Ma,3 Sufang Jiang,1 Jie Yao,4 Lining Huang1 1Department of Anesthesiology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, People’s Republic of China; 2Department of Anesthesiology, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, People’s Republic of China; 3Department of Orthopaedic Surgery, The Key Laboratory of Orthopedic Biomechanics of Hebei Province, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, People’s Republic of China; 4Department of Anesthesiology, The First Affiliated Hospital of Hebei North University, Zhangjiakou, Hebei, People’s Republic of ChinaCorrespondence: Lining Huang, Department of Anesthesiology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, People’s Republic of China, Email 15803213730@163.comPurpose: Postamputation neuropathic pain is a common disease in patients with malignant tumor amputation, seriously affecting amputees’ quality of life and mental health. The objective of this study was to identify independent risk factors for phantom limb pain in patients with tumor amputation and to construct a risk prediction model.Methods: Patients who underwent amputation due to malignant tumors from 2013 to 2023 were retrospectively analyzed and divided into phantom limb pain group and non-phantom limb pain group. To determine which preoperative factors would affect the occurrence of phantom limb pain, we searched for candidate factors by univariate analysis and used multivariate logistic regression analysis to identify independent factors and construct a predictive model. The receiver operating characteristic curve (ROC) was drawn to further evaluate the accuracy of the prediction model in evaluating the phantom limb pain after amputation of bone and soft tissue tumors.Results: Multivariate analysis showed that age (OR, 1.054; 95% CI, 1.027 to 1.080), preoperative pain (OR, 5.773; 95% CI, 2.362 t

Published
2023

43. Digital Audio Watermarking Technique Using Pseudo-Zernike Moments

Author

Wang, Xiangyang, Ma, Tianxiao, Niu, Panpan, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Qing, Sihan, editor, Mitchell, Chris J., editor, and Wang, Guilin, editor

Published
2009
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44. Socioeconomic development shows positive links to the conservation efficiency of China's protected area network.

Author

Zhao, Jinqi, Xiao, Yi, Zhang, Yanliang, Shao, Yuting, Ma, Tianxiao, Kou, Xiaojun, Zhang, Yuanyuan, Sang, Weiguo, and Axmacher, Jan Christoph

Subjects
PROTECTED areas, RARE mammals, ECOTOURISM, ENDANGERED species, BIODIVERSITY conservation, BIODIVERSITY
Abstract

While the protected area (PA) covers >15% of the planet's terrestrial land area and continues to expand, factors determining its effectiveness in conserving endangered species are being debated. We investigated the links between direct anthropogenic pressures, socioeconomic settings, and the coverage of vertebrate taxa by China's PA network, and indicated that high socioeconomic status and low levels of human pressure correlate with high species coverage, with threatened mammals more effectively conserved than reptiles or amphibians. Positive links between conservation outcomes and socioeconomic progress appear linked to local livelihood improvements triggering positive perceptions of local PAs—aided further by ecological compensation and tourism schemes introduced in wealthy areas and reinforced by continued positive conservation outcomes. Socioeconomic development of China's less developed regions might assist regional PA efficiency and achievement of the Kunming‐Montreal Global Biodiversity Framework, while also addressing potential shortcomings from an insufficient past focus on socioeconomic impacts for biodiversity conservation. [ABSTRACT FROM AUTHOR]

Published
2023
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47. Redox-Controlled Energy Transfer Quenching of Fluorophore- Labeled DNA SAMs Enables In Situ Study of These Complex Electrochemical Interfaces

Author

Ma, Tianxiao, Grzȩdowski, Adrian, Doneux, Thomas, Bizzotto, Dan, Ma, Tianxiao, Grzȩdowski, Adrian, Doneux, Thomas, and Bizzotto, Dan

Abstract

Interfaces modified by a molecular monolayer can be challenging to study, particularly in situ, requiring novel approaches. Coupling electrochemical and optical approaches can be useful when signals are correlated. Here we detail a methodology that uses redox electrochemistry to control surface-based fluorescence intensity for detecting DNA hybridization and studying the uniformity of the surface response. A mixed composition single-strand DNA SAM was prepared using potential-assisted thiol exchange with two alkylthiolmodified ssDNAs that were either labeled with a fluorophore (AlexaFluor488) or a methylene blue (MB) redox tag. A significant change in fluorescence was observed when reducing MB to colorless leuco-MB. In situ fluorescence microscopy on a single-crystal gold bead electrode showed that fluorescence intensity depended on (1) the potential controlling the oxidation state of MB, (2) the surface density of DNA, (3) the MB:AlexFluor488 ratio in the DNA SAM, and (4) the local environment around the DNA SAM. MB efficiently quenched AlexaFluor488 fluorescence. Reduction of MB showed a significant increase in fluorescence resulting from a decrease in quenching or energy transfer efficiency. Hybridization of DNA SAMs with its unlabeled complement showed a large increase in fluorescence due to MB reduction for surfaces with sufficient DNA coverage. Comparing electrochemical−fluorescence measurements to electrochemical (SWV) measurements showed an improvement in detection of a small fraction of hybridized DNA SAM for surfaces with optimal DNA SAM composition and coverage. Additionally, this coupled electrochemical redox-fluorescence microscopy method can measure the spatial heterogeneity of electron-transfer kinetics and the influence of the local interfacial environment., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2022

49. A comparative study of DNA self-assembled monolayers made with potential control and open-circuit potential on their thermal stability and functionality using electrochemical techniques and in-situ fluorescence microscopy

Author

Ma, Tianxiao

Abstract

DNA electrochemical (E-DNA) biosensor has developed rapidly and gained worldwide attention from many fields such as medical science, food industry, and environmental analysis. However, current electrochemical DNA biosensors have a few critical limitations that prevent E-DNA sensors from becoming more valuable and useful for commercial applications. This thesis addresses some of the issues of E-DNA biosensors such as thermal stability and functionality using electrochemistry and in-situ fluorescence microscopy. The work in this thesis used single crystal gold bead electrode as the substrate which provided a great opportunity to build the near ideal DNA SAMs with far less defects than on the polycrystalline gold which is typically used in the sensor fabrication. Together with the single crystal Au bead as the substrate and in-situ fluorescence microscopy, a thorough investigation on the properties of DNA SAMs prepare with and without potential control (Edep vs. OCPdep) was conducted. The results demonstrated Edep with superior thermal stability in solution and higher sensitivity than OCPdep. A detailed analysis on the influence of surface crystallography on the thermal stability and the packing behavior of both types of DNA SAMs prepared by Edep and OCPdep was also provided.

Published
2022
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