LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 1220

Search options

  1. Article ; Online: Manipulating amorphous and crystalline hybridization of Na

    Zhou, Yingjie / Yang, Xiecheng / Hou, Minjie / Zhao, Lanqing / Zhang, Xiyue / Liang, Feng

    Journal of colloid and interface science

    2024  Volume 667, Page(s) 64–72

    Abstract: ... ...

    Abstract Na
    Language English
    Publishing date 2024-04-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2024.04.046
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Anti-Aging Effect of

    Zou, Yunxia / Qin, Xiyue / Wang, Wenli / Meng, Qingyong / Zhang, Yali

    International journal of molecular sciences

    2024  Volume 25, Issue 1

    Abstract: Plant polysaccharides are important for anti-aging research. Polysaccharides ... ...

    Abstract Plant polysaccharides are important for anti-aging research. Polysaccharides from
    MeSH term(s) Animals ; Caenorhabditis elegans ; Antioxidants/pharmacology ; Hemerocallis ; Aging ; Polysaccharides/pharmacology ; Plant Extracts/pharmacology
    Chemical Substances Antioxidants ; Polysaccharides ; Plant Extracts
    Language English
    Publishing date 2024-01-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms25010655
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Cooperative Control for Stochastic Multiagent Systems With Deferred Dynamic Constraints via a Novel Universal Barrier Function Approach.

    Guo, Xiyue / Zhang, Huaguang / Sun, Jiayue / Liu, Xin

    IEEE transactions on cybernetics

    2024  Volume 54, Issue 3, Page(s) 1806–1815

    Abstract: This article investigates the cooperative control problem for stochastic multiagent systems (MASs) with dynamic constraints. A new universal barrier function is proposed, which is applicable to many systems with different types of constraint functions, ... ...

    Abstract This article investigates the cooperative control problem for stochastic multiagent systems (MASs) with dynamic constraints. A new universal barrier function is proposed, which is applicable to many systems with different types of constraint functions, even unconstrained systems. Several mapping functions are constructed to constrain the state variables directly without feasibility conditions, and the tracking control is achieved for stochastic MASs with deferred full-state constraints under the backstepping framework. In order to regulate the tracking error more precisely, the funnel error transformation is improved and the deferred funnel controller is developed by introducing a preassigned finite-time function. Based on the deferred funnel controller, the tracking error can be maintained within the predetermined funnel in the preassigned time. The convergence time can be defined according to the actual requirements, and it is independent of the design controller parameters and initial conditions. Finally, some simulation results are given to demonstrate the effectiveness of the proposed control algorithm.
    Language English
    Publishing date 2024-02-09
    Publishing country United States
    Document type Journal Article
    ISSN 2168-2275
    ISSN (online) 2168-2275
    DOI 10.1109/TCYB.2023.3259967
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Optimized Backstepping Cooperative Control for Output-Constrained Stochastic Nonlinear Network Systems via a Multibridge-Hole Function.

    Guo, Xiyue / Zhang, Huaguang / Yue, Xiaohui / Wang, Tianbiao

    IEEE transactions on cybernetics

    2024  Volume PP

    Abstract: In this article, a new leader-following tracking control approach is investigated for stochastic multiagent systems with multibridge-hole output constraints. The multibridge-hole output constraints mean that the output of the system is constrained in ... ...

    Abstract In this article, a new leader-following tracking control approach is investigated for stochastic multiagent systems with multibridge-hole output constraints. The multibridge-hole output constraints mean that the output of the system is constrained in some intervals and unconstrained in other intervals. The constrained and unconstrained intervals can be set arbitrarily. By designing a new shift function to construct the barrier Lyapunov function, the optimal controller is constructed by combining the backstepping technique with the adaptive dynamic programming technique. The model network is used to estimate the unknown disturbances and uncertainty terms in the system. The critic network and the actor network are constructed such that the designed controller adheres to the Bellman optimality principle and gives the optimal solution of the system. The proposed control method is versatile and compatible with various types of output constrained control problems, such as unconstrained control problems, constrained control problems, and delay constrained problems without changing the structure of the controller. Finally, some simulation results are given to verify the effectiveness of the method.
    Language English
    Publishing date 2024-04-19
    Publishing country United States
    Document type Journal Article
    ISSN 2168-2275
    ISSN (online) 2168-2275
    DOI 10.1109/TCYB.2024.3384467
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Impact of graphene oxide on visible light photocatalytic performance of graphene oxide/graphitic carbon nitride three-dimensional structure composites.

    Xiyue, Zhang / Hongjuan, Sun / Tongjiang, Peng / Li, Zeng

    Environmental technology

    2022  Volume 44, Issue 26, Page(s) 3997–4007

    Abstract: The non-metallic catalyst graphitic carbon nitride (g- ... ...

    Abstract The non-metallic catalyst graphitic carbon nitride (g-C
    MeSH term(s) Graphite/chemistry ; Nitrogen Compounds ; Catalysis
    Chemical Substances graphitic carbon nitride ; graphene oxide ; Graphite (7782-42-5) ; Nitrogen Compounds
    Language English
    Publishing date 2022-05-29
    Publishing country England
    Document type Journal Article
    ISSN 1479-487X
    ISSN (online) 1479-487X
    DOI 10.1080/09593330.2022.2077138
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Aging of Amateur Singers and Non-singers: From Behavior to Resting-state Connectivity.

    Zhang, Xiyue / Tremblay, Pascale

    Journal of cognitive neuroscience

    2023  Volume 35, Issue 12, Page(s) 2049–2066

    Abstract: Healthy aging is associated with extensive changes in brain structure and physiology, with impacts on cognition and communication. The "mental exercise hypothesis" proposes that certain lifestyle factors such as singing-perhaps the most universal and ... ...

    Abstract Healthy aging is associated with extensive changes in brain structure and physiology, with impacts on cognition and communication. The "mental exercise hypothesis" proposes that certain lifestyle factors such as singing-perhaps the most universal and accessible music-making activity-can affect cognitive functioning and reduce cognitive decline in aging, but the neuroplastic mechanisms involved remain unclear. To address this question, we examined the association between age and resting-state functional connectivity (RSFC) in 84 healthy singers and nonsingers in five networks (auditory, speech, language, default mode, and dorsal attention) and its relationship to auditory cognitive aging. Participants underwent cognitive testing and fMRI. Our results show that RSFC is not systematically lower with aging and that connectivity patterns vary between singers and nonsingers. Furthermore, our results show that RSFC of the precuneus in the default mode network was associated with auditory cognition. In these regions, lower RSFC was associated with better auditory cognitive performance for both singers and nonsingers. Our results show, for the first time, that basic brain physiology differs in singers and nonsingers and that some of these differences are associated with cognitive performance.
    MeSH term(s) Humans ; Singing/physiology ; Aging ; Music ; Cognition ; Brain ; Magnetic Resonance Imaging
    Language English
    Publishing date 2023-10-03
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1007410-7
    ISSN 1530-8898 ; 0898-929X ; 1096-8857
    ISSN (online) 1530-8898
    ISSN 0898-929X ; 1096-8857
    DOI 10.1162/jocn_a_02065
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: The impact of technological innovation on the green digital economy and development strategies.

    Liu, Yanlin / Yang, Yaoguang / Zhang, Xiyue / Yang, Yaohui

    PloS one

    2024  Volume 19, Issue 4, Page(s) e0301051

    Abstract: To investigate the interplay among technological innovation, industrial structure, production methodologies, economic growth, and environmental consequences within the paradigm of a green economy and to put forth strategies for sustainable development, ... ...

    Abstract To investigate the interplay among technological innovation, industrial structure, production methodologies, economic growth, and environmental consequences within the paradigm of a green economy and to put forth strategies for sustainable development, this study scrutinizes the limitations inherent in conventional deep learning networks. Firstly, this study analyzes the limitations and optimization strategies of multi-layer perceptron (MLP) networks under the background of the green economy. Secondly, the MLP network model is optimized, and the dynamic analysis of the impact of technological innovation on the digital economy is discussed. Finally, the effectiveness of the optimization model is verified by experiments. Moreover, a sustainable development strategy based on dynamic analysis is also proposed. The experimental results reveal that, in comparison to traditional Linear Regression (LR), Decision Tree (DT), Random Forest (RF), Support Vector Machine (SVM), and Naive Bayes (NB) models, the optimized model in this study demonstrates improved performance across various metrics. With a sample size of 500, the optimized model achieves a prediction accuracy of 97.2% for forecasting future trends, representing an average increase of 14.6%. Precision reaches 95.4%, reflecting an average enhancement of 19.2%, while sensitivity attains 84.1%, with an average improvement of 11.8%. The mean absolute error is only 1.16, exhibiting a 1.4 reduction compared to traditional models and confirming the effectiveness of the optimized model in prediction. In the examination of changes in industrial structure using 2020 data to forecast the output value of traditional and green industries in 2030, it is observed that the output value of traditional industries is anticipated to decrease, with an average decline of 11.4 billion yuan. Conversely, propelled by the development of the digital economy, the output value of green industries is expected to increase, with an average growth of 23.4 billion yuan. This shift in industrial structure aligns with the principles and trends of the green economy, further promoting sustainable development. In the study of innovative production methods, the green industry has achieved an increase in output and significantly enhanced production efficiency, showing an average growth of 2.135 million tons compared to the average in 2020. Consequently, this study highlights the dynamic impact of technological innovation on the digital economy and its crucial role within the context of a green economy. It holds certain reference significance for research on the dynamic effects of the digital economy under technological innovation.
    MeSH term(s) Sustainable Development/trends ; Inventions/trends ; Economic Development/trends ; Neural Networks, Computer ; Support Vector Machine ; Bayes Theorem ; Humans
    Language English
    Publishing date 2024-04-25
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0301051
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Anti-Aging Effect of Hemerocallis citrina Baroni Polysaccharide-Rich Extract on Caenorhabditis elegans

    Yunxia Zou / Xiyue Qin / Wenli Wang / Qingyong Meng / Yali Zhang

    International Journal of Molecular Sciences, Vol 25, Iss 1, p

    2024  Volume 655

    Abstract: Plant polysaccharides are important for anti-aging research. Polysaccharides from Hemerocallis citrina Baroni ( H. citrina ) have been reported to have antioxidant activity; however, their anti-aging roles and mechanisms are not clear. In this study, we ... ...

    Abstract Plant polysaccharides are important for anti-aging research. Polysaccharides from Hemerocallis citrina Baroni ( H. citrina ) have been reported to have antioxidant activity; however, their anti-aging roles and mechanisms are not clear. In this study, we extracted polysaccharides from H. citrina by an ultrasonic-assisted water extraction–alcohol precipitation method and chemically determined the physicochemical properties such as extraction yield, content, and in vitro antioxidant properties of H. citrina polysaccharide-rich extract (HCPRE). Using Caenorhabditis elegans ( C. elegans ) as a model animal, the anti-aging effect of HCPRE was investigated, and the mechanism of action of HCPRE was explored by the in vivo antioxidant level assay of C. elegans and the related gene expression assay. The extraction yield of HCPRE was 11.26%, the total polysaccharide content was 77.96%, and the main monosaccharide components were glucose and galactose. In addition, HCPRE exhibited good antioxidant activity both in vitro and in vivo. Under normal thermal stress and oxidative stress conditions, being fed 1200 µg/mL of HCPRE significantly prolonged the life span of C. elegans by 32.65%, 17.71%, and 32.59%, respectively. Our study showed that HCPRE exerted an anti-aging effect on C. elegans , and its mechanism involves increasing the activities of catalase (CAT) and superoxide dismutase (SOD), reducing the level of reactive oxygen species (ROS) and regulating the expression of related genes.
    Keywords Hemerocallis citrina Baroni ; polysaccharide ; C. elegans ; antioxidant ; longevity ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Language English
    Publishing date 2024-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  9. Article ; Online: Preassigned Time Adaptive Neural Tracking Control for Stochastic Nonlinear Multiagent Systems With Deferred Constraints.

    Guo, Xiyue / Zhang, Huaguang / Sun, Jiayue / Zhou, Yu

    IEEE transactions on neural networks and learning systems

    2023  Volume PP

    Abstract: This article studies a preassigned time adaptive tracking control problem for stochastic multiagent systems (MASs) with deferred full state constraints and deferred prescribed performance. A modified nonlinear mapping is designed, which incorporates a ... ...

    Abstract This article studies a preassigned time adaptive tracking control problem for stochastic multiagent systems (MASs) with deferred full state constraints and deferred prescribed performance. A modified nonlinear mapping is designed, which incorporates a class of shift functions, to eliminate the constraints on the initial value conditions. By virtue of this nonlinear mapping, the feasibility conditions of the full state constraints for stochastic MASs can also be circumvented. In addition, the Lyapunov function codesigned by the shift function and the fixed-time prescribed performance function is constructed. The unknown nonlinear terms of the converted systems are handled based on the approximation property of the neural networks. Furthermore, a preassigned time adaptive tracking controller is established, which can achieve deferred prescribed performance for stochastic MASs that provide only local information. Finally, a numerical example is given to demonstrate the effectiveness of the proposed scheme.
    Language English
    Publishing date 2023-04-05
    Publishing country United States
    Document type Journal Article
    ISSN 2162-2388
    ISSN (online) 2162-2388
    DOI 10.1109/TNNLS.2023.3262799
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: Internationalization tactics and enterprise value in the context of the "Belt and Road" initiative-Analysis from the perspective of host country institutional environment and enterprise digital transformation.

    Zhang, Dongchao / Zheng, Xiyue / Wang, Fusheng

    PloS one

    2023  Volume 18, Issue 8, Page(s) e0287324

    Abstract: This paper analyzes the impact of internationalization tactics on the value of 1107 multinational enterprises investing in the "Belt and Road" countries (regions) based on the two dimensions: entry mode and the degree of internationalization (including ... ...

    Abstract This paper analyzes the impact of internationalization tactics on the value of 1107 multinational enterprises investing in the "Belt and Road" countries (regions) based on the two dimensions: entry mode and the degree of internationalization (including the breadth and depth of internationalization). It is found that the choice of sole proprietorship in the "Belt and Road" countries has a positive effect on enterprise value than joint venture. The increase of internationalization breadth and depth can promote enterprise value. Further research shows that the institutional environment of the host country and the digital transformation of enterprises significantly affect the choice of internationalization tactics and enterprise value. Specifically, the better the institutional environment of the host country and the more adequate the digital transformation of enterprises, the more inclined enterprises are to choose the sole proprietorship in the "Belt and Road" countries (regions) to obtain higher enterprise value. A good institutional environment of the host country and the digital transformation of enterprises can positively regulate the relationship between the degree of internationalization and enterprise value. these findings have important for Chinese enterprises to implement internationalization tactics rationally and scientifically, and to continuously improve enterprise value.
    Language English
    Publishing date 2023-08-18
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0287324
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top