28 November 2022, Volume 40 Issue 22

    

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  Science & Technology Review. 2022, 40(22): 0-0.

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  Digital strategy forges the new pattern of China's digital economy

  CHEN Yan, WU Chaonan

  Science & Technology Review. 2022, 40(22): 5-11. https://doi.org/10.3981/j.issn.1000-7857.2022.22.001

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  Since the 18th National Congress of the Communist Party of China, China has seized the strategic opportunity of the new round of technological revolution and industrial change, and elevated the development of the digital economy into a national strategy. Besides, China has issued a series of major policies, which play an important role in supporting and promoting the development of the digital technology and digital economy. This article reviews China's digital economy development strategy and related policies during this period, summarizes the effects of implementation and the remarkable achievements of the digital economy, and proposes recommendations and reflections on the development of China's digital economy based on the summary of experiences and analysis of problems.
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  Life cycle dynamic comparison and evolutionary path survey of the core technologies in artificial intelligence industry of China and the USA

  YUAN Ye, WU Chaonan, LI Jingying, TAO Yuxiang

  Science & Technology Review. 2022, 40(22): 12-19. https://doi.org/10.3981/j.issn.1000-7857.2022.22.002

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  By using Logistic model, the core technology life cycle characteristics in the artificial intelligence industry were dynamically compared between China and the USA. The evolution trend of the core technologies in artificial intelligence industry of China and the USA was discussed by integrating technology life cycle and RTA Index. It discovers that:(1) 2025-2030 will be the key period for the development and breakthrough of core technologies in artificial intelligence industry in China, and China should firmly grasp the critical period to achieve catching-up. (2) During the evolution of the core technologies in artificial intelligence industry, China had technological advantages in computer vision and intelligent adaptive learning, rather than comprehensive technical fields such as cross-media analysis and reasoning and swarm intelligence. Due to the brain-computer interface and smart chip not entering the mature period, China should be aware of the core technique lock-in and defense strategies of the first-mover. Relying on the broad markets and the wide range of application scenarios, natural language processing and autonomous unmanned system were developed rapidly.
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  Comparative research on resilient development strategies of Asian cities

  WANG Jiangbo, CHEN Tao, GOU Aiping

  Science & Technology Review. 2022, 40(22): 20-32. https://doi.org/10.3981/j.issn.1000-7857.2022.22.003

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  As cities are faced with increasingly complex shocks and pressures, the construction of resilient cities has gradually become a practical choice and development trend for city managers to deal with increasingly severe compound disaster risks. Based on the "100 Resilient Cities" project (100RC), this paper systematically sorts out all Asian resilient city practice strategy texts published by the project, and summarizes different cities in East Asia, Southeast Asia, South Asia, and West Asia from three aspects:target vision, strategy content, and implementation framework. Based on the characteristics of resilience strategy arrangement, combined with the characteristics of big cities, general cities, and cultural cities, and taking communities as the starting point for resilience, this paper puts forward the experience and enlightenment that can be referred by China in the practice of resilient cities construction. This paper also explores the practice directions for the localization of constructing resilient cities under the background of globalization.
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  The experience of biophilic city planning and construction in Singapore

  YANG Wenyue, QIU Yuxin

  Science & Technology Review. 2022, 40(22): 33-42. https://doi.org/10.3981/j.issn.1000-7857.2022.22.004

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  Biophilic city is an international frontier urban development model and planning concept, which can effectively solve the urban ecological problems under the background of rapid urbanization and high-density development, and make the city, humans, and nature live together harmoniously. Singapore is one of the leading and prominent practitioners of biophilic city planning and construction in the world. The planning experience is summarized from the aspects of city, community, and architecture:focusing on the construction of an urban ecological space system and developing a multi-functional green network; building multi-theme community gardens and promoting community participation; attaching great importance to the construction of urban aerial greening and creating a green urban landscape. In addition, it summarizes its innovative policies and mechanisms from the aspects of management organization, planning policy, evaluation system, public participation, and ecological accountability. On this basis, this paper puts forward the reference and inspiration for the development, planning, and construction of biophilic cities in China.
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  International research progress on the impact of built environment on travel safety and its enlightenment

  Chen Chun, Yang Qinzhi, Li Yuanyuan

  Science & Technology Review. 2022, 40(22): 43-54. https://doi.org/10.3981/j.issn.1000-7857.2022.22.005

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  With the rapid urbanization and motorization in China, road traffic accidents occur frequently. The improvement of built environment can effectively reduce the travel risk of pedestrians. However, at present, it draws little attention in China. Therefore, based on the existing literature and research, this paper systematically combs the related research on the impact of built environment on travel safety, and systematically reviews the research progress in this field from five aspects including urban development mode, density, land use, road environment and traffic management. This paper puts forward suggestions and prospects for the future study of built environment and travel safety in China, and appeals to urban planning academia to increase the research and attention on the impact of built environment on traffic safety.
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  Research progress on thermo-activated building system

  CHEN Sarula, CHANG Tianxin, YANG Yang, ZHANG Zhi, GUO Anni

  Science & Technology Review. 2022, 40(22): 55-65. https://doi.org/10.3981/j.issn.1000-7857.2022.22.006

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  The thermo-activated building system (TABS), which is considered to be an important measure to achieve the goal of dual control of energy and carbon in buildings, can reduce the building load by injecting low-grade energy to form a thermal barrier. The proposed system is based on controlling the heat transfer temperature difference of the envelope. This paper presents the classification and evaluation methods of TABS, and systematically compares and analyzes air-based, liquid-based and solidbased TABS from the perspectives of thermal performance, integrated design, sustainability and application potential. Existing studies show that the equivalent heat transfer coefficient of the envelope integrated with air-based TABS is less than 0.3 W/(m²· K). Permeable air-based TABS also has the dual effect of heat recovery and air purification; Liquid-based TABS is more advantageous in terms of integration and operational energy efficiency, with an equivalent heat transfer coefficient of the envelope down to -3.6 W/(m²·K); Solid-based TABS has the advantages of no working fluid, no moving parts and no noise, and its envelope equivalent heat transfer coefficient can be reduced to -3.0 W/(m²·K). However, issues such as its façade integration and commercialization of thermoelectric modules need to be addressed in the future.
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  Blocks spatial influencing factors and optimization strategies of convenient travel for visually impaired population in Beijing

  SHEN Lu, HAN Linfei

  Science & Technology Review. 2022, 40(22): 66-77. https://doi.org/10.3981/j.issn.1000-7857.2022.22.007

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  With a relatively high proportion in disabled people, the visually impaired population faces the double demands of general travel and necessary work. At present, there are many problems in the construction of guide space in China, such as nonstandard and non-complete, resulting in the travel inconvenience for the visually disabled people. In order to meet the travel demands of the visually impaired population, the public spaces around the blind massage parlors within the Fourth Ring Road of Beijing are selected as the research samples. In view of three spatial dimensions, i.e. geographical point (crossing space), line (blind sidewalk space) and surface (entrance square space), the visually impaired population safe travel evaluation system is established through the Fuzzy Analytical Hierarchy Process and the Multi-factors Fuzzy Evaluation Method. The results reveal the existing problems:in point space, low degree identification of the blind people; in linear space, serious encroachment of the blind sidewalk core space, in surface space, poor guidance to the entrance of the blind facilities. The overall evaluation of the guide environment tends to be at an "General" level, in which the evaluation scores of safety, standardization and continuity are relatively low, the comfort and identification scores are medium, and the accessibility scores are high. Based on the evaluation results, three suggestions were proposed for the block guide environment optimization to improve the guide space friendliness for the visually impaired population in Beijing, and to provide references for the improvement of the urban guide space in the future.
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  The projected population structure and suggestions for high-quality development in the Xiong'an New Area

  WANG Yanjun, LIU Qingying, SI Lili, PENG Xiangyu, JIANG Tong

  Science & Technology Review. 2022, 40(22): 78-87. https://doi.org/10.3981/j.issn.1000-7857.2022.22.008

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  Projection of population structure in the Xiong'an New Area is great significant for the regional high-quality development. Based on the sixth population census and the Baoding Economic Statistical Yearbooks, the populationdevelopment-environment model is used to project population structure from 2020 to 2035 in the Xiong'an New Area. The policy-oriented population migration plan of the Xiong'an New Area is set by referring to the migration population patterns of the Shanghai Pudong New Area and the Shenzhen Special Economic Zone. The characteristics of the population structure by age, gender and education level were compared between the policy-oriented migration plans and natural migration plan following its historical trend. The research conclusions are as follows:(1) Aging trend of the population has appeared in the Xiong'an New Area. At period 2020-2035, the degree of aging will increase under the natural migration mode. In contrast, aging trend will be alleviated under the policy-oriented migration mode in which the pressure on the labor force might be reduced but the birthrate might be in a low status. (2) The total gender ratio is projected to show a downward trend under both migration modes. Although the gender structure might be improved, the gender ratio will still be slightly higher. (3) Under the natural migration mode, the average length of education will rise from 9 years in 2020 to about 10 years in 2035, which means secondary education will still dominate the population educational structure. Under the policy-oriented migration mode, the average length of education will increase from 9 years to 13.5 years, and the dominant educational level will shift from secondary education to university education. (4) To promote high-quality development in the Xiong'an New Area, some major socio-economic aspects need to be improved including optimization of the pension insurance system and the fertility policy, increasing in the property income of the labor force, strengthening the laws and regulations construction to enhance the awareness of the gender equality, and improvement of infrastructure construction and fostering of innovative talents.
Reviews
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  Research on public information promulgation for major public health emergencies: Core elements, evolutionary path and critical issues

  ZHENG Yu

  Science & Technology Review. 2022, 40(22): 88-96. https://doi.org/10.3981/j.issn.1000-7857.2022.22.009

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  Public information promulgation is the core component of risk communication in major public health emergencies and plays an important role in ensuring social order. From the perspective of the information dissemination process in major public health emergencies, and combined with the information needs of the public at different stages of the development of major public health emergencies, this research aims at formulating norms for information promulgation for major public health emergencies in China. Taking the public information promulgation as a foothold, the core elements and evolution path of public information communication in major public health emergencies are explored. There are three core elements of public information promulgation:certainty of instruction public information, moderation of explanatory public information and acceptance of credibility public information. Based on public opinion of incubation period, acute period and remission period of major public health emergencies, public information promulgation should focus on characteristics of the period. In addition, the balance, heterogeneous and standard of the public information promulgation of major public health emergencies as critical issues are revealed. The findings of the present research would be helpful in gaining the scientific methods of the public information promulgation for decision makers, so as to provide important expansion and a useful supplement for the research of emergency risk communication in China. It is hoped that this research will help promote the further improvement of the emergency management system of major public health emergencies in China, and provide a theoretical basis and methodological basis for effectively improving the efficacy of public information promulgation for Chinese emergency governance of major public health emergencies.
Papers
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  Synthesis of novel enzyme responsive hydrogel and its applications in prevention of postoperative recurrence of triple negative breast cancer

  FU Zhiguang, TAO Cheng, WANG Yu, WEN Ning, HU Lin

  Science & Technology Review. 2022, 40(22): 97-104. https://doi.org/10.3981/j.issn.1000-7857.2022.22.010

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  Triple negative breast cancer has a high local recurrence rate and poor prognosis, which seriously threatens women's health. It is urgent to find a new strategy to effectively prevent progressive disease. The intelligent drug delivery system based on new biomedical materials can play a vital role in the comprehensive and synergistic treatment of the disease. In this study, sunitinib nanoparticles were prepared by solvent precipitation. A new enzyme responsive hydrogel was well prepared after loading the nano-drug into it by Michael addition reaction. Then the novel hydrogel was identified and characterized by transmission electron microscope, stability test, and drug dissolution test. Furthermore, the anti-tumor and anti-recurrence effects of the hydrogel was evaluated by function tests both in vitro and in vivo. Finally, the preliminary biosafety evaluation of the hydrogel was performed. The results indicate that the enzyme responsive hydrogel loading sunitinib nanoparticles was successfully prepared. The physicochemical properties of the new hydrogel showed good stability. The particle size of nano-sunitinib was about 400 nm. The dissolution curves showed that sunitinib nanoparticles could release continuously from the hydrogel, and the release efficiency was higher under the exposing of matrix metalloproteinase-2; functional tests showed that the hydrogel exhibited a good anti-tumor effect in vitro, showing a good biological function to promote apoptosis and prevent recurrence in vivo; the biosafety of the hydrogel in vivo was evaluated and showed no obvious toxicity, mice were well tolerated. Such a therapy strategy may inhibit the local recurrence and improve the clinical benefit of patients.
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  Classified utilization and grade evaluation of closed/abandoned mines in China

  FENG Feisheng, ZHANG Jiqiang, WANG Yu

  Science & Technology Review. 2022, 40(22): 105-112. https://doi.org/10.3981/j.issn.1000-7857.2022.22.011

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  With the transformation of the national energy strategy, a large number of closed/abandoned mines generate under the background of overcapacity reduction, mines closure/abandoning and the demand of high-quality development in the coal industry. In view of the fact that there is currently no complete system of classification utilization and grade evaluation for closed/abandoned mines in China, and the domestic energy structure is still dominated by coal in the short term, aiming at the classified utilization and grade evaluation of closed/abandoned mines, using the Adaboost iterative algorithm, a probability level model for the utilization of closed/abandoned mines was established. It was found that the classified utilization of closed/abandoned mines can be divided as follows:closed/abandoned mines ecological civilization development, underground space development and utilization, remaining media resources development and utilization, groundwater resources development and utilization, complementary energy (gas, oil, water and light) development and utilization. 20 classification parameters are selected as grade evaluation indicators for closed/abandoned mines, and a preliminary database of closed/abandoned mine resources in China is constructed. The closed/abandoned mine green resources evaluation technology system is established, and the scientific concept of intelligent and precise development of closed/abandoned mines is proposed. The research can promote the accurate and intelligent mining of closed/abandoned mines and the urban transformation and development.