Rapid urbanization in China is driving the need of urban rainfall-runoff pollution control technologies due to adverse impacts on water environment. In this study, literature from China National ...Knowledge Infrastructure, Web of Science and Scopus in 1995/1/1–2019/5/15 are used to review research hotspots, development process and future directions of urban rainfall-runoff pollution control technologies in China and global world. Temporal evolution of publications showed that source reduction played better growing trend in urban rainfall-runoff pollution control field for both China and global world. Furthermore, with bibliometric tool, density visualization maps and co-occurrence network maps were created to identify research hotspots in China and global world. By comprehensively analyzing research hotspots above and development process from extracted literature, future directions of urban rainfall-runoff pollution control technologies were predicted. For model and strategy, both China and global world would concern on the accuracy of models to evaluate combination technologies. For source reduction, China would explore rainwater purification in sponge city, while global world would investigate match characteristics between specific regions and control technologies, combination between model and technologies, and improvement of pollutants removal. For process control, China would enhance ecological gutter inlet performance, whereas global world would concentrate on optimization of rainwater harvesting system. For post treatment, China would estimate modified hydrocylone and coagulation technology, and improve performance of filtration systems, riparian buffers and constructed wetlands, while global world would explore ecological and landscape function of constructed wetlands. Since China ranked first in producing Western publications and was the second most cited country for Western publications recently, China would significantly influence future development of urban rainfall-runoff pollution control technologies around the world. Meanwhile, some directions including infiltration basin and rainwater harvesting system were still shortcomings for China due to a late start of urban rainfall-runoff pollution control technologies in China.
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•Chinese and Western literature on urban rainfall-runoff pollution control field are reviewed.•Both quantitative review by bibliometrics and normal qualitative review are used in this study.•Source reduction has better development tendency compared with other categories.•Research hotspots, development process and future directions in China and world are analyzed.•China may lead the future of urban rainfall-runoff pollution control technologies in global world.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Biopesticides have proven to be suitable for the control of agricultural diseases and insects. Natural products and micro-organisms have been used as biopesticides worldwide as they can be sourced ...from the environment, they are generally safe to non-target organisms including humans, they have reduced persistence in the environment, and they are potentially acceptable for use in organic agriculture. Compared with synthetic pesticides, new biopesticides can gain regulatory approval faster. They can also be developed in less time and are much less expensive to develop. In China, some biopesticides currently being developed may be suitable alternatives to chemical pesticides such as Bacillus thuringiensis, Jinggangmycin, pyrethrins and brassinolide. This review summarizes the mode of action of biopesticides and describes their current development for use in agriculture.
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BFBNIB, DOBA, GIS, IJS, IZUM, KILJ, KISLJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Epoxy resins are widely utilized in electronics, electrical components, and communication equipment for polymer‐based wave‐transparent composites. However, the dielectric constant (ε) and dielectric ...loss (tanδ) of common epoxy resins are relatively high (ε for 3.8–4.2; tanδ for 0.018–0.025), and the corresponding impact resistance is poor. Thus, it cannot meet the requirements of advanced microelectronic materials. And the epoxy resins prepared by filling the inorganic fillers are difficult to combine the low ε with good machining performance. The ε and tanδ of intrinsic epoxy resins can be decreased by the synthesis of epoxy monomers and curing agents and the optimization of the final curing network. Meanwhile, the use of some special processing methods, such as the electrospinning technology, is also conducive to reducing the ε and tanδ values of final epoxy‐cured resins. The factors affecting the dielectric properties of epoxy‐cured resins, and the common methods to decrease the ε value of epoxy‐cured resins are reviewed in this article. Then, the design, synthesis and research progress of ultra‐low ε epoxy resins are investigated with the relevant academic results. Finally, the development trends and application prospects of the ultra‐low ε epoxy resins are discussed.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
Overrunning clutches，as kernel components to achieve working condition changes，have two different working states of overrunning and engaging. With the development of mechanical transmission system ...technology，the working condition requirements for overrunning clutch are higher and higher. In order to facilitate further systematic research on overrunning clutch，meet the requirements of new age development of high-end equipment，through combing the related literature of mesh type，friction type two kinds of different types of overrunning clutch，the research hotspot and difficulties of overrunning clutch in recent years are summarized，and the future development direction of the overrunning clutch is analyzed. It is provided a basis and reference for subsequent overrunning clutch research.
In the complex context of urbanization and climate change, how to improve the resilience of cities to deal with various uncertain and unpredictable threats is a new topic with both theoretical and ...practical challenges. In this paper, the researches on urban resilience are summarized using the bibliometric analysis combined with the visualization analysis. We provide a systematic and objective review of resilience applied to urban development focusing on its conceptual frameworks, research tendencies, and assessment methods. The analysis results demonstrate that an increasing attention has been given to urban resilience, especially in the field of climate change. The degree of research varies significantly in different countries, with the USA dominating in the number of publications, followed by the UK and China. Scholars’ attention to urban resilience in different periods is closely related to the development background and disasters experienced by their countries, but there are also some commonalities. Meanwhile, the multi-dimensional research on urban resilience has been recognized by many scholars. Quantitative assessment tools such as simulation model and optimization model have been widely used to assess the level of urban resilience. Based on this, we put forward the future research trends in this field and provide a potential guide for future application of urban resilience.
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CEKLJ, EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
As an important means of atmospheric threat awareness, airborne weather radar plays an important role in aviation security. This paper analyzes the development process of airborne weather radar and ...products and technologies at home and abroad, looks forward to the development trend of airborne weather radar, and combs its key technologies and difficulties in order to promote the research and development of related technologies in China.
Review of sewage flow measuring instruments Sun, Bin; Chen, Shizhe; Liu, Quan ...
Ain Shams Engineering Journal,
June 2021, 2021-06-00, 2021-06-01, Volume:
12, Issue:
2
Journal Article
Peer reviewed
Open access
The selection of the most suitable instrument for measuring the flow of sewage is especially important due to the urgent work of sewage treatment and complex measurement environment of sewage ...systems. To this end, the current work reviews a number of sewage flow measuring instruments divided into four categories of differential pressure flowmeters, open channel flowmeters, electromagnetic flowmeters, and ultrasonic flowmeters and introduces a new retractable portable multifunctional flowmeter. The common flow measuring instruments are also introduced since they are the basis of sewage flow measurement. Moreover, we extensively compare the advantages and disadvantages of these instruments, analyze their ranges of application, and discuss their prospects. Compared with the traditional flow measuring instruments, the new retractable portable multifunctional flowmeter can measure the flow area of sewage pipes, the degree of siltation, and the average water flow in the drain pipes with silt deposits more accurately. In the future, the improvement in accuracy is still the research focus, and sewage flow measuring instruments will have a broader market prospect and development space with the rapid development in the electronic information technology.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
As the natural gas consumption increases at 10% annual rate of growth in China, the importance of stable energy supply is becoming increasingly prominent. Thus, the underground gas storage becomes ...very critical to peak shaving, stable supply and strategic reserve of natural gas. Herein, the shortcomings of construction, operation and technology in the current development of gas storage were put forward by investigating the increment of gas demand in China and the regional distribution characteristics of gas storage at present. The scope of site selection and construction of gas storage was expected to be more extensive, and thereby to form the networked and coordinated gas storage group under the background of striving to build a unified national network of natural gas in China. In the future, underground gas storage will develop towards the direction of intensive, efficient, intelligent, technological and economic development. The research results can provide reference to promote the construction of gas stor
Ultra-precision machining technologies are the essential methods, to obtain the highest form accuracy and surface quality. As more research findings are published, such technologies now involve ...complicated systems engineering and been widely used in the production of components in various aerospace, national defense, optics, mechanics, electronics, and other high-tech applications. The conception, applications and history of ultra-precision machining are introduced in this article, and the developments of ultra-precision machining technologies, especially ultra-precision grinding, ultra-precision cutting and polishing are also reviewed. The current state and problems of this field in China are analyzed. Finally, the development trends of this field and the coping strategies employed in China to keep up with the trends are discussed.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
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