In the new era of Chinese economy stepping toward high‐quality development, with the enhancement of the public environmental protection awareness and continuous improvement of technological innovation level, it is of great significance to study how technological innovation reduces water contamination against unofficial environmental regulations, which is also the primary task of construction of ecological civilization. The purpose of this paper is to study the contribution of technological innovation to water pollution intensity at different quantile levels and to test the nonlinear relationship between technological innovation and water pollution emission intensity under informal environmental pollution. On the basis of the provincial panel data of China from 2002 to 2018, the model of quantile and panel threshold was constructed to empirically analyze the structural mutation and threshold effects of technological innovation on the intensity of water pollution in China against the environment of informal environmental regulation. The study found that the marginal effects of technological innovation on the intensity of water pollution in China had undergone structural changes. Under different water pollution intensity, technological innovation can reduce pollution between 0.167% and 0.415%; with informal environmental regulation as the threshold variable, when the intensity of informal environmental regulation is less than the threshold value of 0.2168, technological innovation has a significant inhibitory effect on China's water pollution intensity, and when the intensity of informal environmental regulation exceeds the threshold value, the mitigation effect of technological innovation on China's water pollution intensity is more significant. The inhibition effect of technological innovation on water pollution emission intensity changed from 0.437 to 0.474. Therefore, when formulating environmental pollution policies, local governments should make rational use of informal environmental regulations and technological innovation, improve the informal environmental regulation system, and promote water pollution control with science and technology.
What is already known about this topic? A passenger who was from the United States was taken to the hotel for the required isolation on November 13, 2020. During the quarantine she was diagnosed as the COVID-19 patient on November 15, 2020. Controlling the importation of COVID-19 remains a major challenge. What is added by this report? In this study, an epidemiological investigation was conducted for a confirmed case of COVID-19, including the treatment records in the hospital and 14day travel trajectory before the onset of disease. What are the implications for public health practice? This study described an epidemiological investigation and management process on an imported case of COVID-19 and analyzed the test results, aiming to provide useful warnings to strengthen the capacity of public health system in response to the importation.
With the continuous development of high-tech industry, Moore’s law is close to the limit. People urgently need nano science and technology to trigger a new scientific and technological revolution to meet the needs of life, military and so on. Nanotechnology covers almost all industries and has made achievements in the industries such as medical, materials, manufacturing, and information technology. It has changed the production and life of human beings and subverted many industries. In recent years, more and more people have conducted data mining on nanotechnology research. By combing the literature, this paper summarizes the core authors, keyword changes, important authors and emergent words of the existing literature. Contributing to analyzing the research status of this field and revealing research hotspots in this field. It is of great significance for scholars to sort out the development process of nano field and predict the future development trend. Using CitesSpace bibliometric analysis software, 44002 pieces of literature about nanotechnology in SCI and SSCI journals in the core collection of the Web of Science database were analyzed in this paper. The results indicated that countries such as the United States, Germany, China, and Japan have issued more articles; However, the centrality of articles published in European countries such as the UK, Germany, and France was relatively strong; High-yield units mainly included Chinese Acad Sci and Russian Acad Sci; The main research scholars were Wei Wang, Peixuan Guo, Thomas J Webster, Hao Yan; Research emergent words primarily included polymer, particle, dynamics, mechanical properties and silver nanoparticle. On this basis, countermeasure suggestions and prospects are proposed.
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