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  1. Article: Modelling the roles of visitor flows and returning migrants in the spatial diffusion of COVID-19 from Wuhan city in China.

    Shen, Jianfa

    Applied geography (Sevenoaks, England)

    2023  Volume 155, Page(s) 102971

    Abstract: COVID-19 has spread to many cities and countries in the world since the major outbreak in Wuhan city in later 2019. Population flow is the main channel of COVID-19 transmission between different cities and countries. This study recognizes that the flows ... ...

    Abstract COVID-19 has spread to many cities and countries in the world since the major outbreak in Wuhan city in later 2019. Population flow is the main channel of COVID-19 transmission between different cities and countries. This study recognizes that the flows of different population groups such as visitors and migrants returning to hometown are different in nature due to different length of stay and exposure to infection risks, contributing to the spatial diffusion of COVID-19 differently. To model population flows and the spatial diffusion of COVID-19 more accurately, a population group based SEIR (susceptible-exposed-infectious-recovered) metapopulation model is developed consisting of 32 regions including Wuhan, the rest of Hubei and other 30 provinces in Mainland China. The paper found that, in terms of the total export, Wuhan residents as visitors and Wuhan migrants returned to hometown were the first and second largest contributors in the simulation period. In terms of the net export, Wuhan migrants returned to hometown were the largest contributor, followed by Wuhan residents as visitors.
    Language English
    Publishing date 2023-04-21
    Publishing country England
    Document type Journal Article
    ISSN 0143-6228
    ISSN 0143-6228
    DOI 10.1016/j.apgeog.2023.102971
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  2. Article ; Online: Modelling the roles of visitor flows and returning migrants in the spatial diffusion of COVID-19 from Wuhan city in China

    Shen, Jianfa

    Applied Geography. 2023, p.102971-

    2023  , Page(s) 102971–

    Abstract: COVID-19 has spread to many cities and countries in the world since the major outbreak in Wuhan city in later 2019. Population flow is the main channel of COVID-19 transmission between different cities and countries. This study recognizes that the flows ... ...

    Abstract COVID-19 has spread to many cities and countries in the world since the major outbreak in Wuhan city in later 2019. Population flow is the main channel of COVID-19 transmission between different cities and countries. This study recognizes that the flows of different population groups such as visitors and migrants returning to hometown are different in nature due to different length of stay and exposure to infection risks, contributing to the spatial diffusion of COVID-19 differently. To model population flows and the spatial diffusion of COVID-19 more accurately, a population group based SEIR (susceptible-exposed-infectious-recovered) metapopulation model is developed consisting of 32 regions including Wuhan, the rest of Hubei and other 30 provinces in Mainland China. The paper found that, in terms of the total export, Wuhan residents as visitors and Wuhan migrants returned to hometown were the first and second largest contributors in the simulation period. In terms of the net export, Wuhan migrants returned to hometown were the largest contributor, followed by Wuhan residents as visitors.
    Keywords COVID-19 infection ; exports ; geography ; models ; China ; Spatial diffusion ; Human mobility ; COVID-19 pandemic ; Spatial SEIR model ; Wuhan city
    Language English
    Publishing place Elsevier Ltd
    Document type Article ; Online
    Note Pre-press version
    ISSN 0143-6228
    DOI 10.1016/j.apgeog.2023.102971
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  3. Article: Measuring the impact of mitigation measures on infection risk of covid-19 in Hong Kong since February 2020.

    Shen, Jianfa

    Cities (London, England)

    2021  Volume 114, Page(s) 103192

    Abstract: Is it possible to control the covid-19 pandemic in large cities like Hong Kong? Many cities have adopted various mitigation measures to contain the covid-19 pandemic. But few studies have been made to measure the impact of mitigation measures on ... ...

    Abstract Is it possible to control the covid-19 pandemic in large cities like Hong Kong? Many cities have adopted various mitigation measures to contain the covid-19 pandemic. But few studies have been made to measure the impact of mitigation measures on infection risk at city level such as Hong Kong. This paper introduced three indicators to measure the infection risk of covid-19 under mitigation measures: the infection rate, the primary risk of infection and daily risk of infection. Two factors are introduced to consider the impact of mitigation measures on infection risk in Hong Kong. They are the number of trips per day and the percentage of people wearing face masks. With these two mitigation measures, the daily risk of infection was reduced from 1826.11 per million to 644.58 per million in the peak of covid-19 infection on 2 August 2020. The covid-19 infection risk would be 2.83 times higher if above mitigation measures were not adopted. The covid-19 pandemic continues in 2021 and city governments are strongly recommended to take effective measures to encourage the public to reduce unnecessary trips and wear face mask before the pandemic is fully controlled.
    Language English
    Publishing date 2021-03-23
    Publishing country England
    Document type Journal Article
    ISSN 0264-2751
    ISSN 0264-2751
    DOI 10.1016/j.cities.2021.103192
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Covid-19 and inter-provincial migration in China

    Shen, Jianfa

    Eurasian Geography and Economics

    2020  , Page(s) 1–7

    Keywords Geography, Planning and Development ; Economics and Econometrics ; covid19
    Language English
    Publisher Informa UK Limited
    Publishing country uk
    Document type Article ; Online
    ISSN 1538-7216
    DOI 10.1080/15387216.2020.1820355
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Antioxidant activity of spirostanol saponins from Allii Macrostemonis Bulbus and their contents in different origins and processed products.

    Wu, Jianfa / Cui, Ying / Liu, Chang / Ding, Weixing / Ren, Shen / Zhang, Jing / Wang, Lulu

    Food chemistry: X

    2024  Volume 21, Page(s) 101144

    Abstract: Allii Macrostemonis Bulbus (AMB), a traditional Chinese edible and medicinal plant, is considered beneficial to health. In this study, we isolated and purified nine steroidal saponins ( ... ...

    Abstract Allii Macrostemonis Bulbus (AMB), a traditional Chinese edible and medicinal plant, is considered beneficial to health. In this study, we isolated and purified nine steroidal saponins (compounds
    Language English
    Publishing date 2024-01-17
    Publishing country Netherlands
    Document type Journal Article
    ISSN 2590-1575
    ISSN (online) 2590-1575
    DOI 10.1016/j.fochx.2024.101144
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  7. Article: Settlement intention of migrants in urban China: The effects of labor-market performance, employment status, and social integration

    Wang, Chenglong / Shen, Jianfa

    Applied geography. 2022 Oct., v. 147

    2022  

    Abstract: There is growing scholarly interest in settlement intention of migrants in urban China. But little is known about how settlement intention of migrants is shaped by their labor-market performance, employment status, and social integration. Using the ... ...

    Abstract There is growing scholarly interest in settlement intention of migrants in urban China. But little is known about how settlement intention of migrants is shaped by their labor-market performance, employment status, and social integration. Using the structural equation modelling approach, this paper attempts to reveal the trajectory from migrants' labor-market performance to their decision to stay at destinations. Based on the survey data collected from 8 Chinese cities, we found that migrants' labor-market performance positively influences their settlement intention. The impact tends to be more influential for migrants in wage-employment and self-employment groups. For these two groups, the impact consists of direct effect and indirect effect. Perceived labor-market performance, social relation, sense of belonging, and group identity mediate the relationship between labor-market performance and settlement intention. For migrant entrepreneurs, there is only indirect effect of labor-market performance on settlement intention. The results support that the advantage in economic status could break the institutional barrier in migrants' settlement. But for the low-income-level group, the role of individuals’ economic status in shaping their settlement intention is strengthened by the hukou system. Findings point to the significance of adopting distinguished steps to promote settlement intention of migrants for different employment groups.
    Keywords equations ; geography ; labor market ; self-employment ; socioeconomic status ; surveys ; China
    Language English
    Dates of publication 2022-10
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0143-6228
    DOI 10.1016/j.apgeog.2022.102773
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  8. Article ; Online: Hukou transfer intention of rural migrants with settlement intention in China: How cities' administrative level matters

    Wang, Chenglong / Shen, Jianfa / Liu, Ye

    Journal of Rural Studies. 2023 Apr., v. 99 p.1-10

    2023  

    Abstract: This paper is the first to investigate the role of China's top-down model captured by cities' administrative level in the hukou transfer intention of rural migrants with settlement intention. We develop a conceptual framework and attribute rural migrants' ...

    Abstract This paper is the first to investigate the role of China's top-down model captured by cities' administrative level in the hukou transfer intention of rural migrants with settlement intention. We develop a conceptual framework and attribute rural migrants' decision on hukou transfer to a comprehensive evaluation of the benefit, risk, and opportunity. Using a Multilevel Logistic Regression, the empirical study uncovers that the impact of cities' administrative level comprises direct effect and moderating effect. The direct effect highlights the benefit of hukou transfer, through which cities' administrative level positively affects rural migrants' hukou transfer intention. The moderating effect underlines both the benefit and risk of obtaining urban local hukou, through which cities' administrative level shapes the relationship between marital status/migration type/arable land/homestead/household income and hukou transfer intention. Our work offers an international insight into rural migrants' settlement by revealing the role of cities' political system in shaping the stratification of the distribution of permanent migrants at the city level. It also contributes to the knowledge of the neoclassical perspective in migration studies by considering rural migrants' long-term cost-benefit balance on settlement.
    Keywords arable soils ; empirical research ; household income ; marital status ; models ; politics ; regression analysis ; risk ; China ; Rural migrants ; Hukou transfer intention ; Settlement intention ; Administrative level
    Language English
    Dates of publication 2023-04
    Size p. 1-10.
    Publishing place Elsevier Ltd
    Document type Article ; Online
    ZDB-ID 252458-2
    ISSN 0743-0167
    ISSN 0743-0167
    DOI 10.1016/j.jrurstud.2023.01.022
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    In stock of ZB MED Bonn / Germany

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  9. Article: Competition and cooperation in the Hong Kong-Shenzhen region

    Shen, Jianfa

    Handbook of regions and competitiveness : contemporary theories and perspectives on economic development , p. 446-462

    2017  , Page(s) 446–462

    Author's details Jianfa Shen
    Language English
    Publisher Edward Elgar Publishing
    Publishing place Cheltenham, UK
    Document type Article
    ISBN 1-78347-500-5 ; 978-1-78347-500-1
    Database ECONomics Information System

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  10. Article ; Online: Mechanism of Organic Matter Accumulation in Black Shales of the Yuertusi Formation in the Tarim Basin

    Yangyang Wang / Jianfa Chen / Weibing Shen / Min Li

    Frontiers in Earth Science, Vol

    Insights From Paleoenvironmental Variation During the Early Cambrian

    2022  Volume 10

    Abstract: The paleoenvironment during the Early Cambrian is closely related to the accumulation mechanism of organic matter (OM) from the Lower Cambrian black shales. However, paleoenvironment remains a controversial issue. Here, we reported a lot of detailed data ...

    Abstract The paleoenvironment during the Early Cambrian is closely related to the accumulation mechanism of organic matter (OM) from the Lower Cambrian black shales. However, paleoenvironment remains a controversial issue. Here, we reported a lot of detailed data of sedimentary stratigraphy and geochemistry of the Lower Cambrian Yuertusi Formation in the Aksu area, Tarim Basin. The Yuertusi Formation from the Yutixi outcrop consists mainly of silicalite at the base, two sets of black shales, and crystalline dolostone. Based on the redox conditions traced by U/Th, V/Cr, Ni/Co, and V/Sc, the hydrothermal activity traced by Ce/Ce*, Cr/Zr, U/Th, Fe/Ti, and (Fe + Mn)/Ti ratios, as well as paleo-productivity traced by Ba, Cu, Rb/Sr, and other parameters, variations were observed in the depositional environments of the Yuertusi Formation: 1) the silicalite at the base was deposited under an euxinic condition and intense hydrothermal activity. Mo-U co-variation analysis revealed that the north margin of Tarim Basin belonged to the unrestricted marine during the Early Cambrian, 2) the lower black shales were deposited under an oxygen-poor condition and weak hydrothermal activity, and 3) the upper black shales were deposited under oxygen-poor, sub-oxic conditions and almost no hydrothermal activity. Although the hydrothermal activity improved paleo-productivity, the TOC values were low on the whole, which may be due to the intense hydrothermal activity that damaged the formation of source rocks. Comprehensive studies showed a gradually oxidizing environment and weakening paleo-productivity during the Yuertusi Formation deposited. The anoxic conditions were conducive to the preservation of OM, and the high-quality source rocks represented by the black shales of the Yuertusi Formation were formed, especially the first set of black shales. However, the enrichment of OM may be affected by the intense hydrothermal activity.
    Keywords black shales ; Lower Cambrian ; paleoenvironment ; organic matter accumulation ; Tarim Basin ; Science ; Q
    Subject code 550
    Language English
    Publishing date 2022-03-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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