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Article ; Online: Microstructure and properties of carbon fiber-H62 brass matrix composites prepared by friction stir processing

Wenchang Li / Xuesong Li / Yunfeng Li

Journal of King Saud University: Science, Vol 35, Iss 5, Pp 102652- (2023)

2023

Abstract: Carbon fibre (CF) reinforced H62 brass matrix composites were fabricated by friction stir process (FSP). The influence of CF compound amount and welding speed on the microstructure and properties of CF-H62 brass matrix composites was investigated by ... ...

Abstract	Carbon fibre (CF) reinforced H62 brass matrix composites were fabricated by friction stir process (FSP). The influence of CF compound amount and welding speed on the microstructure and properties of CF-H62 brass matrix composites was investigated by variable orthogonal experiments by drilling CF filled holes in H62 brass plates. Under the set experimental process parameters, the stirred friction processed composites with good surface formation, all without macroscopic defects, no loosening or holes. Optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to observe the microstructure of the joints. The microstructure is a fine isometric crystal that is the result of dynamic recrystallisation. As the welding speed increased from 20 mm/min to 60 mm/min, the average grain size at the weld in the weld zone decreased from 5 μm to 2 μm. When the hole depth of the filled CF was 1.5 mm and the welding speed was 40 mm/min, the CF was most uniformly distributed in the composite area. This paper uses the orthogonal test method to optimise the formulation design of a variety of reinforcement fibre contents. The friction and wear properties as well as the physical properties of the two friction material samples were tested using a constant speed friction tester, a shear strength tester and a Rockwell hardness tester. The influence of each fibre and content on the friction material properties was investigated by extreme difference analysis; The best fibre ratio formulation was selected by combining a fuzzy comprehensive evaluation method. ANOVA was used to investigate the changes in friction material properties after the addition of graphene.
Keywords	H62 brass matrix composites ; Friction stir processing ; Carbon fiber ; Matrix composites ; Science (General) ; Q1-390
Subject code	620
Language	English
Publishing date	2023-07-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Engineering Ultra-Permeable and Antifouling Water Channel-based Biomimetic Membranes toward Sustainable Water Purification

Xuesong Li / Linyan Yang / Jaume Torres / Rong Wang

Journal of Membrane Science Letters, Vol 3, Iss 2, Pp 100049- (2023)

2023

Abstract: Water channel-based biomimetic membranes (WBMs) are gaining increasing attention due to the effectiveness of water channels in enhancing water permeability and breaking the permselectivity trade-off. However, the ultra-permeable WBMs may suffer from ... ...

Abstract	Water channel-based biomimetic membranes (WBMs) are gaining increasing attention due to the effectiveness of water channels in enhancing water permeability and breaking the permselectivity trade-off. However, the ultra-permeable WBMs may suffer from severe membrane fouling issue because a high-water flux tends to result in an accelerated fouling and thus compromises the benefits gained from the usage of water channels. Herein, a novel in-situ modification protocol was proposed to enhance the antifouling performance of ultra-permeable WBMs. The nanovesicles incorporated with aquaporin (AQP) water channels were functionalized with polyethylene glycol brushes (i.e., PEGylation) via a facile self-assembly approach and subsequently encapsulated in the selective layer of thin-film composite membranes through interfacial polymerization. The modification had minimal impact on the function of AQPs, resulting in WBMs with a high water permeance (∼8.2 LMH/bar) and good NaCl rejection (96.4%) comparable to the unmodified WBMs. Moreover, the in-situ modification drastically enhanced the surface hydrophilicity, which endowed the membrane with a superior fouling resistance to organic foulants. The improved fouling resistance ensured a more sustainable operation of ultra-permeable WBMs, particularly in scenarios that favor high water fluxes. This facile modification strategy provides an efficient way to fabricate ultra-permeable and antifouling WBMs for sustainable water purification.
Keywords	water channel ; highly permeable membranes ; antifouling performance ; in-situ modification ; PEGylation ; Chemistry ; QD1-999
Subject code	550
Language	English
Publishing date	2023-11-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Holistic Governance for Sustainable Public Services

Xuesong Li / Yunlong Ding

International Journal of Environmental Research and Public Health, Vol 17, Iss 5, p

Reshaping Government–Enterprise Relationships in China’s Digital Government Context

2020 Volume 1778

Abstract: The notion of holistic governance was originally proposed to make up for the fragmentation of public service provision. However, such a notion also has a great potential to be transferred and understood in the digital government context in China, where ... ...

Abstract	The notion of holistic governance was originally proposed to make up for the fragmentation of public service provision. However, such a notion also has a great potential to be transferred and understood in the digital government context in China, where there is an increasing need to reshape the landscape of government−enterprise relationships that can enable enterprises to involvement effectively in holistic governance, or the planning and design of public services. However, previous empirical studies on holistic governance have neglected the question of how to make this happen. The aim of this article is to fill these gaps, building on holistic governance theory, this article offers a theoretical framework for government−enterprise relationships under the holistic governance paradigm. The framework identifies a comprehensive set of relationships that explain how these relationships affect enterprises’ participation in public service provision. The empirical analysis is based on case studies of four e-services cooperation programs in China. We report three main findings. First, economic incentive should be developed in combination with a holistic governance strategy in order to encourage policymakers to reshape government−enterprise relationships. Second, it seems that the implementation of holistic governance is more effective when complemented with a managerial strategy in relation to organizational transformation. Finally, trust-building between governments and enterprises plays a pivotal role in nurturing the holistic governance paradigm. These findings have important policy implications for efforts to promote enterprise participation and cross-sector solutions to fragmented public service provision.
Keywords	holistic governance ; sustainable public services ; digital government ; government–enterprise relationships ; Medicine ; R
Subject code	320
Language	English
Publishing date	2020-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Can environmental regulations achieve both profitability and profit quality? A natural experiment based on the China Cleaner Production Standards

Bowen Sun / Hongyi Li / Xuesong Li

Chinese Journal of Population, Resources and Environment, Vol 19, Iss 1, Pp 65-

2021 Volume 81

Abstract: ABSTRACT: Numerous studies evaluated the effects of end-of-pipe control environmental regulations (EER). However, few scholars discussed the effects of process management environmental regulations (PER), such as the China Cleaner Production Standards ( ... ...

Abstract	ABSTRACT: Numerous studies evaluated the effects of end-of-pipe control environmental regulations (EER). However, few scholars discussed the effects of process management environmental regulations (PER), such as the China Cleaner Production Standards (CCPS) implemented by the country's Ministry of Ecology and Environment. Using data on China's manufacturing enterprises, this paper adopts the CCPS policies as quasi-natural experiments and uses differences-in-differences (DID) methods to analyze their effects on enterprise profitability and profit quality, respectively. The results show that: first, the CCPS significantly improve both profitability and profit quality; that is, the implementation of the environmental regulation policy plays a significant role in improving enterprise profit rates and cash flows. Second, for the profitability mediator effects, the short-term Porter effect of CCPS is not significant but shows the opposite during the lag period and significantly reduces the management cost and wage levels, comprehensively promoting enterprise profitability. Third, for the profit quality meditator effects, environmental regulations improve the enterprises' cash flow by reducing management costs and increasing government subsidies; however, its effect on bank credit subsidies is not significant. Fourth, for the moderator effects, the environmental regulations' effect on enterprises profitability and profit quality depends on the strategic interaction among local governments, the scale and ownership of the enterprise, and regional differences. That is, the strategic interaction weakens the effect of environmental regulations on enterprise performance. Environmental regulations have a stronger influence on profitability and profit quality for large-scale, state-owned, and coastal enterprises.
Keywords	Environmental regulations ; Cleaner Production Standards ; China Industrial Enterprises Database ; Differences-in-differences (DID) ; Environmental sciences ; GE1-350
Subject code	333
Language	English
Publishing date	2021-03-01T00:00:00Z
Publisher	KeAi Communications Co., Ltd.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A time-space conversion method for material synthesis research

Yuting Hou / Minghao Liang / Fangzhu Qing / Xuesong Li

iScience, Vol 24, Iss 11, Pp 103340- (2021)

2021

Abstract: Summary: Research on material synthesis is mostly performed through batch by batch testing with each corresponding to a set of parameters and a reaction time. Concurrent experiments that allow for multiple loadings throughout an inhomogeneous reaction ... ...

Abstract	Summary: Research on material synthesis is mostly performed through batch by batch testing with each corresponding to a set of parameters and a reaction time. Concurrent experiments that allow for multiple loadings throughout an inhomogeneous reaction zone provide a way to obtain high-throughput results. Here, a time-space conversion method is proposed. By sequentially passing a number of identical objects through a reaction zone, a significant diversity of reactions in one batch can be achieved depending on the spatial distribution and changes with time of the reaction zone. In particular, when the reaction zone is steady, the evolution of a reaction can be associated with the objects at their corresponding reaction stage. This greatly improves the efficiency and accuracy of research on material synthesis kinetics. This method may initiate a new wave of material synthesis research and accelerate the development of material science.
Keywords	Materials science ; Materials synthesis ; Nanomaterials ; Science ; Q
Subject code	660
Language	English
Publishing date	2021-11-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Fabrication of Perovskite Film-Coated Hollow Capillary Fibers Using a Fast Solvent Exchange Method

Xuesong Li / Pan Zeng / Qiongrong Ou / Shuyu Zhang

Nanomaterials, Vol 11, Iss 1483, p

2021 Volume 1483

Abstract: Metal halide perovskites have been successfully applied in a variety of fields such as LEDs, lasers and solar cells, thanks to their excellent optoelectronic properties. Capillary fibers can further expand the range of perovskite applications and at the ... ...

Abstract	Metal halide perovskites have been successfully applied in a variety of fields such as LEDs, lasers and solar cells, thanks to their excellent optoelectronic properties. Capillary fibers can further expand the range of perovskite applications and at the same time improve its stability by encapsulating the perovskite inside the capillary. However, the high-quality perovskite film-coated hollow capillary fibers have yet to be realized. Here, we introduce a fast solvent exchange method which is used for the preparation of neat and smooth perovskite films deposited on the inner surface of capillary fibers. We demonstrate that this fast solvent exchange method is superior to the commonly used spontaneous diffusion-based precipitation method. The obtained hollow capillary fibers show a narrowed spectral width of 4.9 nm under pulse excitation due to the optical cavity effect. This new fabrication method can facilitate the development of perovskites in the fields of capillary lasing, microfluidic sensing, flexible LEDs and luminous fabrics.
Keywords	perovskite film ; capillary fiber ; solvent exchange ; amplified spontaneous emission ; Chemistry ; QD1-999
Subject code	660
Language	English
Publishing date	2021-06-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Numerical Study of Turbid Slab Optical Properties Reconstruction from Multiple Scattering Signals Using Time-Based Markov Chain Model

Hujie Pan / Qinglin Xu / Xuesong Li / Shangning Wang / Min Xu

Applied Sciences, Vol 11, Iss 2, p

2021 Volume 588

Abstract: The reconstruction of optical properties for opaque mediums is highly desired for medical, atmosphere and aerosol applications. However, the modeling and reconstruction process is highly related with multiple scattering phenomena, which elevates both the ...

Abstract	The reconstruction of optical properties for opaque mediums is highly desired for medical, atmosphere and aerosol applications. However, the modeling and reconstruction process is highly related with multiple scattering phenomena, which elevates both the complexity and computational costs for such efforts. This work introduces a time-based Markov chain method, which uses a sparse transition matrix to represent the likelihood for a photon to transit in the turbid media. The accuracy of the time-based Markov chain model was verified against the forwarding calculations of the scattering-based Markov chain model and Monte Carlo simulations. Then, reconstruction was performed with backscattered photon angular distributions. Based on the characteristics of the sparse transition matrix, the optical properties (droplet diameters) could be obtained layer by layer with transmitted photon distributions at different time durations. It is shown that the time-based Markov chain model can reconstruct the optical properties of a turbid slab with satisfactory accuracy and lower computational costs.
Keywords	multiple scattering ; optical properties reconstruction ; Markov chain ; time-based method ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
Subject code	620
Language	English
Publishing date	2021-01-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Recent advances in electrocatalytic membrane for the removal of micropollutants from water and wastewater

Lehui Ren / Jinxing Ma / Mei Chen / Yiwen Qiao / Ruobin Dai / Xuesong Li / Zhiwei Wang

iScience, Vol 25, Iss 5, Pp 104342- (2022)

2022

Abstract: Summary: The increasing occurrence of micropollutants in water and wastewater threatens human health and ecological security. Electrocatalytic membrane (EM), a new hybrid water treatment platform that integrates membrane separation with electrochemical ... ...

Abstract	Summary: The increasing occurrence of micropollutants in water and wastewater threatens human health and ecological security. Electrocatalytic membrane (EM), a new hybrid water treatment platform that integrates membrane separation with electrochemical technologies, has attracted extensive attention in the removal of micropollutants from water and wastewater in the past decade. Here, we systematically review the recent advances of EM for micropollutant removal from water and wastewater. The mechanisms of the EM for micropollutant removal are first introduced. Afterwards, the related membrane materials and operating conditions of the EM are summarized and analyzed. Lastly, the challenges and future prospects of the EM in research and applications are also discussed, aiming at a more efficient removal of micropollutants from water and wastewater.
Keywords	Electrochemistry ; Environmental science ; Membranes ; Science ; Q
Subject code	660
Language	English
Publishing date	2022-05-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Cytoskeleton regulator RNA expression on cancer-associated fibroblasts is associated with prognosis and immunotherapy response in bladder cancer

Yucai Wu / Yangyang Xu / Shiming He / Yifan Li / Ninghan Feng / Jian Fan / Yanqing Gong / Xuesong Li / Liqun Zhou

Heliyon, Vol 9, Iss 3, Pp e13707- (2023)

2023

Abstract: Background: Dysregulation of long noncoding RNAs (lncRNAs) has been reported to be associated with multiple tumors where they act as tumor suppressors or accelerators. The lncRNA CYTOR was identified as an oncogene involved in many cancers, such as ... ...

Abstract	Background: Dysregulation of long noncoding RNAs (lncRNAs) has been reported to be associated with multiple tumors where they act as tumor suppressors or accelerators. The lncRNA CYTOR was identified as an oncogene involved in many cancers, such as gastric cancer, colorectal cancer, hepatocellular carcinoma, and renal cell carcinoma. However, the role of CYTOR in bladder cancer (BCa) has rarely been reported. Methods: Using cancer datasets from The Cancer Genome Atlas (TCGA) program, we analyzed the association between CYTOR expression and prognostic value, oncogenic pathways, antitumor immunity and immunotherapy response in BCa. The influence of CYTOR on the immune infiltration pattern in the urothelial carcinoma microenvironment was further verified in our dataset. Single-cell analysis revealed the role of CYTOR in the tumor microenvironment (TME) of BCa. Finally, we evaluated the expression of CYTOR in BCa in the Peking University First Hospital (PKU–BCa) dataset and its correlation with the malignant phenotype of BCa in vitro and in vivo. Results: The results indicated that CYTOR was highly expressed in multiple cancer samples, including BCa, and increased CYTOR expression contributed to poor overall survival (OS). Additionally, elevated CYTOR expression was significantly correlated with clinicopathological features of BCa, such as female sex, advanced TNM stage, high histological grade and non-papillary subtype. Functional characterization revealed that CYTOR may be involved in immune-related pathways and the epithelial mesenchymal transformation (EMT) process. Moreover, CYTOR had a significant association with infiltrating immune cells, including M2 macrophages and regulatory T cells (Tregs). CYTOR facilitates the crosstalk between cancer-associated fibroblasts (CAFs) and macrophages, and mediates M2 polarization of macrophages. Correlation analysis revealed a positive correlation between CYTOR expression and programmed cell death-1 (PD-1)/programmed death ligand 1 (PD-L1)/expression and other targets for ...
Keywords	Bladder cancer ; CYTOR ; Survival ; Immune infiltration ; Immunotherapy ; Science (General) ; Q1-390 ; Social sciences (General) ; H1-99
Subject code	616
Language	English
Publishing date	2023-03-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: M-Government Cooperation for Sustainable Development in China

Xuesong Li / Yunlong Ding / Yuxuan Li

Sustainability, Vol 11, Iss 7, p

A Transaction Cost and Resource-Based View

2019 Volume 1884

Abstract: Mobile government (m-Government) is highly valued by many countries and governments worldwide for its important technical, economic, and political benefits. A development trend worthy of attention in China is that various public mobile services are ... ...

Abstract	Mobile government (m-Government) is highly valued by many countries and governments worldwide for its important technical, economic, and political benefits. A development trend worthy of attention in China is that various public mobile services are provided through the cooperation between governments and Internet enterprises. The m-Government cooperation, as component of the public service system, has both a benefit safeguard function by mitigating transaction hazards and a value creation function by sharing advantageous resources. Previous studies have not explained both functions for m-Government cooperation. This study addresses this research gap. We establish a theoretical model by developing hypotheses from integrating model of Transaction Costs Theory (TCT) and Resource-based Theory (RBT). The OLS and Poisson regression method are used to test the proposed model by using cross-sectional data collected from 284 cities in China. Results show that strategy alliance, technology-specific knowhow, and financial security positively influence m-Government cooperation, asset specificity negatively influences the m-Government cooperation, and environmental certainty has no significant impact on m-Government cooperation. From the perspectives of technology, policy, and culture, the article puts forward suggestions on how to better promote m-Government cooperation in China, including promoting the government’s digital capabilities, improving the citizen’ privacy protection system and cultivating a public-private cooperative culture of mutual trust.
Keywords	mobile government ; transaction costs theory ; resource-based theory ; cooperation ; sustainable development ; Environmental effects of industries and plants ; TD194-195 ; Renewable energy sources ; TJ807-830 ; Environmental sciences ; GE1-350
Subject code	650
Language	English
Publishing date	2019-03-01T00:00:00Z
Publisher	MDPI AG
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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