13 May 2020, Volume 38 Issue 9

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    Think Tank
  • CHENG Xu, ZHU Wanbin
    Science & Technology Review. 2020, 38(9): 6-12. https://doi.org/10.3981/j.issn.1000-7857.2020.09.001
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    The core issue of present development of agriculture and rural life in China is how to increase peasants' income considerably. Low income comes from the absent benefits from the second and tertiary industries within agriculture. The guiding principle of integrating rural primary, secondary and tertiary industries has recently been drawn up, while the achievement so far keeps unsatisfying, because of identical rural industries which can hardly form ‘pillar’ industry and because of the lack of means to promote the integration. This paper proposes an agriculture model of ‘whole links of agro-industry chain’, based on analyzing relevant experiences of ancient Chinese agriculture and foreign modern agriculture The content of such a new area includes full utilization of organic residues and wastes, growing dedicated energy plants(bushes and grasses) on marginal land, converting these two kinds of biomass into energy commodities and bio-based materials through biorefinery in situ or in outside scaled plants, as well as selling them. Such an innovative concept model is defined as ‘Second Agriculture’ in this paper.
  • Exclusive: Building China's Powerful Transportation
  • LU Huapu
    Science & Technology Review. 2020, 38(9): 17-25. https://doi.org/10.3981/j.issn.1000-7857.2020.09.003
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    Since the State Council announcd the "the Outline of the Construction of Transportation Power" in September 2019, China's transportation development has entered a new journey. The state is now preparing the outline of comprehensive three-dimensional traffic network planning. All provinces and cities are actively carrying out the construction of transport power demonstration area. Based on the description of the role and significance of transportation, this paper analyzes the current situation and gap of China's transportation development, summarizes the experience and enlightenment of the transportation development in major world powers, expounds the opportunities and challenges of China's construction of a transportation power, interprets the key breakthrough points in the construction. Finally the paper puts forward some suggestions.
  • LUO Qingzhong, LI Na, JIA Guangzhi
    Science & Technology Review. 2020, 38(9): 26-31. https://doi.org/10.3981/j.issn.1000-7857.2020.09.004
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    Thanks to its recent rapid development, China's railway sector is among the best or even leading the world in terms of size and quality of the railway network, technology and equipment, passenger ridership and freight volume. China has become a country with strong railway competitiveness and the railway has been playing a significant role in economic growth and social development. However, there is still room for improvement. Focusing on the current railway challenges and objectives the paper suggests that it is urgent for China railway to further improve the quality of development, optimize network structure, enhance innovation, improve transportation benefit, safety and services, promote green and intelligent railway development, and strengthen international influence.
  • PENG Zheng, HU Huaqing
    Science & Technology Review. 2020, 38(9): 32-38. https://doi.org/10.3981/j.issn.1000-7857.2020.09.005
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    To build a civil aviation power in the new era, technological innovation must act as the key driving force. This paper analyzes the connotation of civil aviation power and its requirements for technological innovation. Civil aviation technological innovation needs to meet the new situational requirements in terms of providing new momentum for development, enhancing effective supply, breaking resource constraints, improving independent innovation capabilities, and responding to the new round of technological revolution. The main directions of civil aviation technological innovation include four aspects:infrastructure, transportation equipment, operation technology and transportation organization.
  • HU Qingyong, LI Ganshan, PEI Zhongzhe
    Science & Technology Review. 2020, 38(9): 39-46. https://doi.org/10.3981/j.issn.1000-7857.2020.09.006
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    In order to effectively achieve the goal of building China into a country with strong transportation network, this paper explores the role of big data technology, its application methods, and prospects in the fields of transportation management, traffic safety, traffic information service, transportation planning, and public transportation. Some cutting-edge technologies, such as situation awareness(SA) system based on CPS, multimodal transportation knowledge graph(KG) based on dynamic ontology, and intelligent video recognition based on edge computing and deep learning, are covered. The overall big data engineering framework and implementation methods are also analyzed, and relevant application scenarios are provided.
  • ZHANG Bo, PANG Jimin, ZHANG Wensong, QIE Xiaohu, LIU Xianghong
    Science & Technology Review. 2020, 38(9): 47-54. https://doi.org/10.3981/j.issn.1000-7857.2020.09.007
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    Various new types of Internet plus transportation are emerging and a large number of data resources have appeared. To build China's strength in transportation it is importank to make better use of big data technology to promote intelligent transportation. Aiming at the shortcomings of the traditional signal control system such as low optimization frequency and poor integrity of data acquisition equipment this paper develops an intelligent signal control system using ride hailing vehicle trajectory data. The architecture and characteristics of the control system, as well as optimization techniques, are introduced. Field experiments in Jinan, Wuhan and Liuzhou, respectively, have demonstrated that without relying on channelization and intersection reconstruction, only through signal control optimization and software upgrades, the average delay times of morning and evening peak hours and vehicle stop times are decreased by 10%-20%, thus effectively alleviating traffic congestion across the whole city level.
  • LU Yang, LI Ping, ZOU Qinghua
    Science & Technology Review. 2020, 38(9): 55-61. https://doi.org/10.3981/j.issn.1000-7857.2020.09.008
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    This paper discusses the future direction and strategic path of smart city and their relation with the development of ITS (intelligent transportation system) by considering the current stage and future bottlenecks of smart city technology as well as traffic problems and challenges faced by megacities in China. The article further elaborates the core function and advantage of edge computing server as the basic cell of the entire smart city information infrastructure. Finally, the paper proposes some future applications of edge computing server in the context of smart city and transportation.
  • ZHANG Xiaochun, SHAO Yuan, HUANG Qixiang
    Science & Technology Review. 2020, 38(9): 62-71. https://doi.org/10.3981/j.issn.1000-7857.2020.09.009
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    Shenzhen is one of the core engine cities in the Guangdong-Hong Kong-Macao Greater Bay Area and the pilot zone for socialism with Chinese characteristics. Demonstrating a new mode of transportation modernization management in megacity and building a multimodal transportation network that effectively supports the construction of global benchmark city are the two strategic choices of Shenzhen. Based on the transportation resource endowment, this paper analyzes the opportunities and challenges of megacity, and puts forward the path of high-quality transportation development with the help of science and technology application and mechanism innovation in megacity. Then, four major directions of building a strong transportation network are formed. This paper also proposes a series of core tasks that need to be broken through. Moreover,this paper explores how to build a strong transportation network which could efficiently support the strategic orientation of the city and transportation service, as well as help science and technology innovation to be widely applied.
  • CHEN Zihui, LOU Dong, XU Yi
    Science & Technology Review. 2020, 38(9): 72-81. https://doi.org/10.3981/j.issn.1000-7857.2020.09.010
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    The Third Plenary Session of the 12th CPC Hangzhou Municipal Committee proposed to speed up the construction of a unique and wonderful world-famous city and build Hangzhou into a model city with strong transportation network. Guided by the outline of building a country with strong transportation network, we present an in-depth analysis of problems, trends, and the construction of Zhejiang model area, and put forward the "four strengthening demonstrations" for multilayered transportation, industrialized transportation, intensive transportation and credible transportation, and the "four leading demonstrations" for enchanting transportation, digitalized transportation, civilized transportation and secure transportation.
  • REN Yongli, DONG Hangrui
    Science & Technology Review. 2020, 38(9): 82-88. https://doi.org/10.3981/j.issn.1000-7857.2020.09.011
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    This paper discusses the development status and bottleneck of traditional intelligent transportation at first, then combined with the development of motor road coordination technology it puts forward an integrated intelligent transportation solution of car, road and cloud. Next, it presents the L4 self-driving bus demonstration operation under open road condition of Zhengzhou Smart Island, which has been put into normal operations for passengers. The successful landing of the project has verified the feasibility of the road coordination core application scheme(blind zone early warning and signal coordination), and laid a practical foundation for the development of road cooperative technology innovation. Finally the paper visions the future of the coordinated development of the road in terms of the country's latest 5G and transportation power policy.
  • LIU Changjian
    Science & Technology Review. 2020, 38(9): 89-96. https://doi.org/10.3981/j.issn.1000-7857.2020.09.012
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    Focusing on one belt one road construction and aiming at the problem of overseas port network construction, the paper systematically studies the progress and achievements of China's overseas port network construction in terms of current situation, classification of cooperation modes, and analysis of economic contribution mechanism. It also puts forward the following suggestions:improving the layout of overseas ports, promoting the coordinated development of port and city, building the whole logistics system for production, transportation and marketing, and promoting the construction of sea-land combined logistics network. These proposals will be useful for Chinese enterprises to further improve the layout of overseas ports, and promote the infrastructure interconnection and high-quality construction of one belt, one road.
  • Review
  • SI Liming, Lü Xin
    Science & Technology Review. 2020, 38(9): 97-101. https://doi.org/10.3981/j.issn.1000-7857.2020.09.013
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    Synthetic biology is a burgeoning field that involves synthesis of novel biological systems not generally found in nature through re-designing and engineering biological parts. Metamaterials are a class of non-living materials that achieve exotic material properties from artificial unit cells by periodic/nonperiodic arrangement. Artificial intelligence and big data are known as the fourth paradigm of science after empirical, theoretical, and computational-driven approaches, meanwhile, the fourth industrial revolution after steam power, electrical energy, and information technology. Some new concepts are proposed by merging synthetic biology, metamaterials and artificial intelligence together in this paper. We will see the expansion of research areas from synthetic biology, metamaterials and artificial intelligence into bio-metamaterials/meta-biomaterials, intelligent metamaterials, intelligent synthetic biology/bio-AI, and even to intelligent bio-metamaterials. We believe that such interdisciplinary studies will provide new ideas for science and technology innovations and are expected to develop disruptive technologies in the fields of biomedicine, materials science and information technology.
  • LIU Zhuo, LIU Ying, LI Hu, WANG Zhonglin, LI Zhou
    Science & Technology Review. 2020, 38(9): 102-110. https://doi.org/10.3981/j.issn.1000-7857.2020.09.014
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    Implantable transient electronic devices are almost constructed from biodegradable materials. These electronic devices can be degraded and absorbed in vivo, not only without the need for secondary surgery, but also avoid the negative effects of long-term implantation. As an emerging research field, it has enormous potential in vivo sensing and therapy. However, most implantable transient electronics require an external power supply to maintain normal operation, which greatly limits their applications in vivo. Therefore, a new type of biodegradable energy device with biocompatibility, controllability and biodegradability has become an urgent need in the field of medical engineering. This paper mainly introduce four biodegradable energy devices (biodegradable primary batteries, photovoltaic cells, supercapacitors and triboelectric nanogenerators) and their applications. In addition, the challenges and future trends that they have been faced are also discussed.
  • Papers
  • ABUDOUREXITI Tuerhongjiang, MENG Xiangyu, REHEMA Sulaiman, MA Liang, LIU Yuntao, HE Chuanyu
    Science & Technology Review. 2020, 38(9): 111-116. https://doi.org/10.3981/j.issn.1000-7857.2020.09.015
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    To observe and analyze the short-term efficacy of percutaneous endoscopic lumbar discectomy surgery, 91 patients diagnosed as LDH and treated with PELD operation in our department from July 2015 to January 2017 were collected retrospectively. During the 6-month follow-up, we used visual analogue scale (VAS) and Oswestry disability index (ODI) to evaluate preoperative and postoperative (3 day, 3 month, 6 month) disturbance indexes of the patient. The operation time, intraoperative blood loss, hospital stay, recurrence rate and complication were observed and recorded using revised Macnab criteria for efficacy evaluation. The postoperative (3 days, 3 and 6 months) VAS and ODI values of the waist and leg were significantly decreased (P<0.05). There was no significant difference between 3 days from 3 months and 6 months postoperative VAS values for lumbar and leg (P>0.05). VAS scores of leg pain were significantly reduced 3 days after surgery as compared to 3 months after surgery (P<0.05). The VAS score of the lumbar at 6 months after surgery was reduced compared to 3 days after surgery, but the difference was not statistically significant (P>0.05). The improved Macnab standard was 88%. The average blood loss was 35mL; the average length of stay was 8 days. Percutaneous endoscopic lumbar discectomy is quite safe, effective and of less traumatic outcome with fewer complications and has a significant effect on rapid rehabilitation after the operation.