Double Circulation Research Articles

Analysis of the Current State and Prospects for the Development of the Tourism Services Market in China

Aim. The purpose of the study is to analyze the current state of the Chinese tourism services market and the prospects for its development in the context of the public policy of the PRC.Tasks. Research objectives: perform a cluster analysis of entrepreneurial activity in the field of tourism, construct a diagram of the distribution of travel agencies by clusters; comply with the current state of the tourism services market in terms of key metrics; study government support measures for the industry; determine the prospects for the development of the tourism services market of the PRC and Russian-Chinese cooperation in the context of the implementation of the new “double circulation” strategy.Methods. Methodological basis and research methods: systematic approach, logical analysis, synthesis, cluster and regression analysis, content analysis of open sources.Results. The results obtained: the supply-side model of China’s modern tourism landscape includes three clusters; The specificity of China’s domestic tourism market is the holiday tourism segment; a new driver of economic growth is domestic tourism, the preferences of domestic tourists reflect a wide range of interests; the system of state support for tourism includes direct and indirect methods that adapt to changes in the external and internal environment.Conclusions. With a high probability, the prospects for cooperation between the PRC and the Russian Federation are assessed quite highly; favorable factors in the development of Russian-Chinese cooperation are the opening of new “windows of opportunity” after the COVID-19 pandemic, as well as the restriction of outbound tourist flows to unfriendly countries and changes in the vector towards the BRICS countries, SCO, and EAEU.

Numerical investigation on mixing behaviour in the contact zone of an industrial‐scale dissolved air flotation tank

AbstractThe mixing behaviour of the wastewater and the recycle bubbly water in the contact zone could affect the separation performance of dissolved air flotation systems. In this study, the mixing characteristics in the contact zone of an industrial‐scale dissolved air flotation tank were investigated using the computational fluid dynamics method. At first, the influence of the turbulence model on the simulation results was clarified. It is demonstrated that the realizable k‐ε model could predict the gas holdup distribution with better accuracy, and the maximum relative deviation between the predicted gas holdup and the experimental results is only 10%. The influence of the geometry and operating parameters on the mixing process was then studied numerically. It is found that the mixing performance in the contact zone could be improved by decreasing the height position of the nozzle inlet in a certain range. The reason is that microbubbles disperse better in the bottom region and a double circulation flow state forms in the contact zone when the nozzle inlet is installed at a low height. Additionally, the mixing process could be further enhanced by decreasing the diameter of the nozzle inlet. As to the operating conditions, increasing the recycle ratio could not only increase the gas holdup but also improve the mixing performance in the contact zone. When the recycle flow rate remains constant, increasing the wastewater flow rate will lead to a decrease in gas holdup and deterioration of the mixing effect.

Carcinogenic and Non-Carcinogenic Health Risk Evaluation of Heavy Metals in Water Sources of the Nubian Sandstone Aquifer in the El-Farafra Oasis (Egypt)

Expanding anthropogenic activities, globally and in Egypt, have increased concentrations of heavy metals in surface and ground waters. Contamination of drinking water may threaten public health. In the present study, the concentrations of 10 heavy metals were analyzed from natural springs (6) and drilled wells (10) in the Nubian Sandstone Aquifer of the El-Farafra Oasis and the White Desert National Park, Egypt. The average concentrations of heavy metals were in most cases below critical values of the WHO drinking water standard, except for Fe and Mn (average values were 495 and 107 µg·L−1, respectively). There is a surface circulation that develops within limestone (Post-Nubian Aquifer System—PNAS) and feeds the springs, while the water present in the wells (at least for the deeper ones) comes from the ferruginous sandstone (Nubian Sandstone Aquifer System—NSAS). This double circulation could account for the differences in the EC and TDS values (typical of a circulation in limestone-type aquifers for springs) and the Fe and Mn enrichment coming from the ferruginous sandstone of the NSAS. The average chronic daily intake (CDI) values for heavy metals in the study area are listed in decreasing order in the following: Fe > Mn > Zn > Co > Ni > Cr > As > Pb > Co > Cd. The total hazard quotient (HQtotal = HQoral + HQdermal) and Hazard Index (HI) values calculated for different heavy metals were well below the acceptable limit, indicating no significant non-carcinogenic health risks to the residents of both areas via oral and dermal absorption of drinking water. Furthermore, the results obtained for the total risk to human health showed that oral ingestion is the major pathway. Carcinogenic risk analysis indicated that the Incremental Lifetime Cancer Risk (ILCR) values for Pb, Cd, Ni, and Cr were well below the acceptable limits.

Research on enterprise financing credit based on soft and hard information under the background of blockchain

Under "accelerating the formation of a new development pattern of domestic circulation and domestic and internationaldouble circulation mutually promoting", high-tech enterprises, as an important role in promoting scientific and technological innovation and economic development, are facing the dilemma ofdifficult and expensive financing. This paper establishes acharacteristic evaluation and credit guarantee systembased on big data credit model to explore the difference ofsoft and hard informationon financing of high-tech enterprises in Anhui Province under the background of double circulation. Taking 131 high-tech enterprises in Anhui Province as samples, this paper analyzes the influence of unstructured soft information and structured hard information on credit evaluation and its intensity byhierarchical linear regression model. The results show that soft and hard information indexes have significant positive effects on credit risk of high-tech enterprises, and soft information has more obvious effects on small and medium-sized high-tech enterprises.

Research on Cross Risk Management of Alibaba's Supply Chain

Cross-regional risk management is very key to realize the smooth and efficient circulation of goods between regions in China. Under the construction of a new development pattern with domestic circulation as the main body and domestic and international double circulation promoting each other, the cross-regional nature of supply chain network brings challenges and risks to the circulation of commodities. Innovation point of this research is to place Alibaba electrical products as the research object, through to the supply chain risk management are discussed. Policy exists between the different areas, cultural, geographical differences, these differences may cause a disruption in supply chains, delay or accuracy. Supply chain managers need to adopt a series of strategies and measures to reduce and manage cross-regional risks, so as to ensure the smooth flow of goods and promote economic development and growth. This study can also contribute to the development of the theory and practice of risk management in cross-regional supply chains.

Innovative Development Strategies for China's Pilot Free Trade Zones under the New Development Pattern

The China's Pilot Free Trade Zones are an important hub for the promotion of China's domestic and international double circulation,and is the key to opening up the "double circulation" blockage and promoting a wider range of reform and opening up to build a new development pattern. Although China's Pilot Free Trade Zones have achieved a lot in promoting the construction of a new development pattern,there are still five problems:the regional layout needs to be optimized, the domestic trade circulation test task needs to be strengthened,the level of policy and system coordination needs to be improved,the cultivation of innovative development driving force needs to be enhanced, and the risk prevention and control system needs to be improved. Under the background of China's active construction of a new development pattern, it is necessary to further optimize the layout of the Pilot Free Trade Zones, increase the domestic trade circulation development test task, strengthen the coordination and cooperation of various policies and systems, cultivate the innovative driving force of high-quality development, enhance the ability to prevent and defuse opening risks, and further play the role of the Pilot Free Trade Zones in serving the new development pattern.

«New normal» and the Сhinese model of «dual circulation»: To the question of the «present stage» of the global economy’ development

The reserch explores multiple approaches to the term “new normality”, which appeared in the scientific economic community after the 2008 crisis, and became relevant again with the proclamation of a “new economic era” in China, the “entry” of the world community into the era of the Anthropocene, and the collision of the world with a problem of global significance - the COVID-19 virus. The relevance of the topic is also due to modern conditions: the turbulence of the world economy, which it has entered not only since the beginning of the pandemic, but also as a result of those “tectonic” shifts in the system of international economic relations that occurred after Russia launched a special military operation. The need to supplement and expand the term “new normality” comes from the questions: “If the term “new normality” or “norm” arises, then what is the “old norm”? In relation to what phenomena or processes is this term used and what is the set of definitions and approaches to it?”. The purpose of this article is to identify the main features of the “new normality” in the context of the growth and development phase that the Chinese economy entered in 2014, in particular. The “new normality” in Chinese is based on achieving a more diversified structure of the national economy, ensuring sustainable growth and a more even distribution of benefits. The etymology and development of the term “new normality” are considered. Despite the multiplicity of approaches, a single definition for the term in question has not developed, neither within the framework of economic science, nor within the framework of other areas. The prerequisites underlying the “new norm” in Chinese are analyzed in detail, including those that served as the basis for revising the country’s economic development model and implementing the model known today as the “double circulation” model. The author raises the question of the need to develop an approach to the term also in the key of current events, tectonic shifts in the world economy and the system of international economic relations, which, objectively, can be characterized as a “crisis” of the modern stage of the development of the world economy, known as globalization, or a transitional period, a transitional stage to a new, a completely different stage in the development of the world economy. The main conclusion of the study is as follows: the current stage of the development of the world economy, that is, globalization, is experiencing an acute phase of turbulence, which obviously began long before the last economic crisis of 2008. The events of the last few years show that the effects of globalization to a certain extent cease to justify themselves: increased international competition, increased protectionism policies and an increase in the number of trade disputes within the WTO, escalation of “trade wars”, COVID-19 and its impact on the entire system of international economic relations, disruption and restructuring of production and logistics chains, as well as the exit of TNCs from the Russian market as a result of a special military operation, all this indicates that the current stage of development of the world economy is now a transitional period not because of the effects and processes that occur under the influence of certain events, but because of the restructuring of the entire global economic and geopolitical architecture. All of the above, in turn, requires an adequate response from the economic schools in the form of the need to develop theoretical approaches to the question of the transitive nature of the current stage of the development of the world economy and the transition to another stage.

Morphogenetic processes in the development and evolution of the arteries of the pharyngeal arches: their relations to congenital cardiovascular malformations.

The heart and aortic arch arteries in amniotes form a double circulation, taking oxygenated blood from the heart to the body and deoxygenated blood to the lungs. These major vessels are formed in embryonic development from a series of paired and symmetrical arteries that undergo a complex remodelling process to form the asymmetric arch arteries in the adult. These embryonic arteries form in the pharyngeal arches, which are symmetrical bulges on the lateral surface of the head. The pharyngeal arches, and their associated arteries, are found in all classes of vertebrates, but the number varies, typically with the number of arches reducing through evolution. For example, jawed vertebrates have six pairs of pharyngeal arch arteries but amniotes, a clade of tetrapod vertebrates, have five pairs. This had led to the unusual numbering system attributed to each of the pharyngeal arch arteries in amniotes (1, 2, 3, 4, and 6). We, therefore, propose that these instead be given names to reflect the vessel: mandibular (1st), hyoid (2nd), carotid (3rd), aortic (4th) and pulmonary (most caudal). Aberrant arch artery formation or remodelling leads to life-threatening congenital cardiovascular malformations, such as interruption of the aortic arch, cervical origin of arteries, and vascular rings. We discuss why an alleged fifth arch artery has erroneously been used to interpret congenital cardiac lesions, which are better explained as abnormal collateral channels, or remodelling of the aortic sac.

Digital inclusive finance, consumer consumption and high-quality economic development.

Against the backdrop of the COVID-19 pandemic and China's pursuit of the "double circulation" strategy, scholars are increasingly focusing on ensuring high-quality economic development in China. In this regard, digital inclusive finance and consumer consumption are of utmost significance. This study employs panel data from 30 provinces and cities spanning 2011 to 2020 to explore the impact of digitized inclusive finance on consumer consumption and high-quality economic development through a spatial econometric model. Our findings indicate that integrating digital finance with consumer consumption and economic development fosters high-quality economic growth. Furthermore, our semi-parametric spatial lag model suggests a nonlinear relationship between digital inclusive finance and high-quality economic growth, shaped like an inverted "U". Additionally, we examine the mediating effect of consumer consumption on the relationship between digital inclusive finance and high-quality economic development. Our results reveal a substitution effect between digital inclusive financing and consumer consumption in promoting high-quality economic development. Therefore, it is essential to promote the development of digital inclusive finance, harness its positive spillover effects between regions, and encourage an increase in consumer consumption to optimize the consumption structure, upgrade and adjust the industrial structure, and spur growth in emerging industries.

Technological achievements in regional economic development: An econometrics analysis based on DEA

“Double circulation” is an important strategic choice under the development of the new situation. The transformation of university scientific and technological achievements and the coordinated development of regional economy are of great significance to the construction and development of the new paradigm. In this paper, DEA method is used to measure the transformation efficiency of scientific and technological achievements of universities in 31 provinces and autonomous regions (excluding Hong Kong, Macao and Taiwan), and the entropy weight-Topsis model is used to evaluate the quality of regional economic development. The comprehensive scores of the two systems are coupled and coordinated finally. It is found that the transformation efficiency of scientific and technological achievements of universities in 31 provinces and autonomous regions (excluding Hong Kong, Macao and Taiwan) is mostly DEA effective, and the transformation ability of scientific and technological achievements of universities is strong in the regions where university resources are concentrated and the economically developed regions, meanwhile there is a big gap between regions. The transformation ability of scientific and technological achievements in the central and western regions has a big room for improvement. The transformation level of scientific and technological achievements of universities in most provinces is still at a middle level of coordination with the level of regional economic development. In view of the above research conclusions, some countermeasures and suggestions are put forward in order to promote the transformation of scientific and technological achievements and regional economic development can be more coordinated.

Innovation factor double circulation: Cross-border mobility and the manufacturing industry's total factor productivity.

The improvement of the manufacturing industry's total factor productivity depends not only on innovation factor double circulation, but also on cross-border mobility to a large extent. This paper constructs a model that demonstrates the impact of innovation factor double circulation and cross-border flow on the manufacturing industry's total factor productivity, and it seeks to estimate this impact by using panel data from China's manufacturing industry taken from the period 2009-2020. It finds the path dependence of innovation factors significantly increased their double circulation cost, and did not significantly improve the manufacturing industry's total factor productivity. It finds the path dependence of innovation factors significantly increased their double circulation cost, and did not significantly improve the manufacturing industry's total factor productivity. Cross-border flow improves the marginal efficiency of innovation factors, realizes the spatial agglomeration of high-end innovation factors and greatly promotes the double circulation of innovation factors in a way that effectively improves the manufacturing industry's total factor productivity. These conclusions have profound policy implications: cross-border flows can promote the incremental adjustment of innovation factors; fully release the development potential and toughness of the dual circulation of innovation factors; and are essentially conducive to improving the manufacturing industry's total factor productivity.

Research on the Problems and Countermeasures of Chinese Enterprises’ Outward Foreign Direct Investment in the Context of Global Economic Uncertainty

Outward foreign direct investment (OFDI) is an important way to promote China’s economic transformation and achieve high-quality economic development, and it plays an important role in building a new development pattern that focuses on the domestic systemic circulation as the main body, with domestic and international double circulations promoting each other. In the context of the uncertainty of the current global economic environment, investment protectionism is arising in various countries, and there is an obvious trend of anti-globalization. The sudden outbreak of COVID-19, the Russian Ukrainian war, and other conflicts have severely damaged the global economy and investment, significantly increased the risk of overseas investment, and reduced the confidence in outward foreign direct investment. Chinese enterprises face serious challenges and problems in OFDI. This article starts from explaining the current situation of Chinese enterprises’ OFDI and continues with an analysis on the existing problems and puts forward suggestions to increase foreign investment in China.

Research on the New Path of High-quality Development of General Aviation Industry under the New Development Pattern of "Double Circulation"

The paper reviews the achievements of the development of general aviation industry in the 13th Five-Year Plan period. With the supply-side structural reform as the main line, the reconstruction and improvement of navigation laws and regulations as the key point, the streamline administration, delegate power, strengthen regulation and improve services reform as the focal point, the reform of the navigation supervision mode and the strengthening of supervision and supervision as the starting point, the general aviation industry ecosystem has begun to take shape. This paper analyzes the shortcomings of the development of general aviation industry at present, and finally puts forward the path of high-quality development of general aviation industry based on the double-cycle theory.

The Evolution and Factors Affecting the Distribution Industry in Poverty-Stricken Counties of Henan Province, China

Under the background of rural revitalization and domestic and international double circulation, vigorously developing the rural distribution industry is an important measure needed to accelerate the process of urban–rural integration, and to enhance the effect of poverty alleviation. In this study, 36 poverty-stricken counties in the southeast of Henan Province, China were selected as research objects; the evolution characteristics and factors influencing the counties’ distribution industries and their development were studied, using the modified gravity model, exploratory spatial data analysis, and a spatial econometric model. The overall scale of the county-level distribution industry in the poverty-stricken areas of southeast Henan expanded, but regional development was uneven, and a spatial pattern of “high in the northeast–low in the southwest” was demonstrated. Meanwhile, the development of the distribution industry in the counties of the district had a circular spatial trend of “agglomeration–diffusion–agglomeration”, with a significant local spatial polarization effect. In addition, the technology level, market demand, population size, and industrial structure adjustment had positive spatial spillover effects on the development of counties’ distribution industries, while labor and capital exerted negative spatial spillover effects. On this basis, to promote the interactive development of the distribution industry and rural economic growth and further accelerate the process of urban–rural integration, we should continually optimize the spatial layout of the distribution industry, improve the construction of county-level circulation infrastructure, and boost new circulation formats and models.

Strategic Analysis of Expanding Consumption Demand from the Perspective of Double Circulation

In the process of economic development, China is trying to smooth the domestic circulation and promote the domestic and international double circulation so as to form a strong domestic market and build a new development pattern. China's socialist market economy is a market-oriented economy, which is essentially a consumer-demand-oriented economy. In its economic development, China has put more emphasis on taking consumption as the driving force of economic development, enhancing the contribution of consumption to economic development, and taking expanding domestic demand as the strategic basis for development. In order to expand domestic demand in the context of double circulation, we should pay attention to coordinating the relationship between accumulation and consumption, expanding domestic demand and opening up, supply structure and demand structure, urban and rural residents' income and social consumption power, give full play to the guiding role of consumption demand, form a positive interaction between consumption demand and economic growth, and promote the healthy development of the socialist market economy.

Influence of installation height of a submersible mixer on solid‒liquid two‒phase flow field

With the increasingly severe situation of water pollution control, optimal design of the mixing flow field of submersible mixers and improving the mixing uniformity of activated sludge have become key research issues. At present, the research on the submersible mixer is mostly focused on water as the medium, and the flow field characteristics of solid-liquid two-phase flow, which is closer to the actual scene, still need more systematic research. This paper presented numerical simulations of the solid‒liquid two‒phase flow problem at various installation heights based on the coupled CFD‒DEM method in the Euler‒Lagrange framework. The velocity distribution, dead zone distribution, particles’ velocity development, particles’ mixing degree, and particles’ aggregation of the flow field were compared and analyzed for different installation heights. The results show that the flow field has two flow patterns: single‒ and double‒circulation, due to different installation heights, in which the velocity and turbulent kinetic energy of the flow field of the double‒circulation flow pattern are more uniform. The installation height affects the moment particles enter the impeller and the core jet zone, thus affecting the degree of particle mixing and the mixing time. The adjustment of the installation height also has an impact on particle aggregation. These findings indicate that the installation height significantly affects the flow field characteristics and the particle motion distribution. The coupled CFD‒DEM method can analyze the macroscopic phenomenon of the solid‒liquid two‒phase flow field of the submersible mixer from the scale of microscopic particles, which provides a theoretical approach for the optimal design of the mixing flow field. It can provide better guidance for engineering practice.

Китай: возможно ли всеобщее процветание?

Against the background of the aggravation of the US-Chinese rivalry, as well as the increasing level of criticality of internal socio-economic problems, Beijing is trying to accelerate the implementation of national development strategies, the main of which are the general “Great revival of the Chinese nation” and more focused “Common prosperity” and “Double circulation”. In general, these programs are interrelated and interdependent, and without the implementation of one of them it is impossible to implement the rest. They are designed to reduce the criticality of socio-economic imbalances formed in China during economic reforms and especially after 2008, as well as lay the foundation for the future socio-economic development of the PRC based on the dominance of domestic final consumption of households in order to avoid Beijing’s dependence on external economic and political conditions. This article considers, first of all, the “Common prosperity” program, the implementation of which in the medium term should level the social situation in China, as well as expand demand from the middle class. In addition, “Common prosperity” also has a pronounced ideological character, since it is a relatively new idea of the CPC General Secretary and, ultimately, the reputation of both Xi Jinping himself and the Communist Party of China as a whole depends on the success of its implementation. In an economic sense, “Common prosperity” is one of the stages of achieving the “Second centennial goal”, according to which Beijing plans to become in 2049, if not the first power, then the “second” first power at the level of the United States. That is, victory or at least parity in strategic rivalry with the United States depends on “Common prosperity”. At the same time, despite the importance of “Common prosperity” the final clear plan still doesn’t exist. The main question remains: where, in the context of a decrease in the effectiveness of traditional growth factors of the Chinese economy, to take resources for its implementation. If you increase the taxation of the Chinese middle class, which is already not rich by world average standards, then you can reduce the demand on its part and hit the “double circulation”. If you introduce taxes on real estate, you can hit the Chinese real estate market on the income from which provincial budgets depend a lot. If rely on tertiary distribution, that is, to form a tradition of charity, it is not clear whether this will be sustainable. In a difficult economic environment, Beijing will have to look for mutually satisfying and balanced solutions to very difficult tasks.

The US Policy of Sanctions and Restrictions against China. Beijing’s Tactical Countermeasures and Strategic Counteraction Potential

A sharp reversal of the Chinese vector of the US foreign policy inevitably came with the election of Donald Trump to the presidency in 2017, whose entire election campaign was accompanied by accentuated anti-Chinese rhetoric. Beijing’s response to the powerful pressure of the Trump administration was not the curtailment of state industrial development programs (Made in China – 2025, etc.) required by Washington, but the proclamation of a course to ensure the country’s economic security, increase the level of technological self-sufficiency, further strengthen the role of the domestic market and reduce dependence on exports. In particular, the latest provisions were included in the “double circulation” policy adopted in October 2020. By now, Washington has imposed on China, though sensitive, still limited sanctions which generally do not have a significant impact on the socio-economic development of the country. Even with the WH’s firm political will, effective sanctions potential of the US against China is significantly limited due to enormous interdependence of the two largest world economies. In general, the US sanctions of recent years against China can be divided into two large blocks: officially justified by the interests of US national security (restrictions on telecommunications companies, the ban of Chinese software, etc.) and related to accusations of human rights violations (restrictions on Xinjiang Uygur Autonomous Region of the PRC and Hong Kong SAR). However, in some cases the real reason for the restrictions imposed is the desire of the United States to contain China in the context of general political, economic and technological rivalry of the two countries.

Double circulant codes for the Lee and Euclidean distance

<abstract><p>This paper investigates double circulant codes of length $ 2n $ over $ \mathbb{Z}_{{{p^m}}} $ where $ p $ is an odd prime, $ n $ goes to infinity, and $ m\ge 1 $ is a fixed integer. Using random coding, we obtain families of asymptotically good Lee codes over $ \mathbb{Z}_{{{p^m}}} $ in the case of small and large alphabets, and asymptotically good Euclidean codes over $ \mathbb{Z}_{{{p^m}}} $ for small alphabets. We use Euclidean codes to construct spherical codes, and Lee codes to construct insertion/deletion codes, by a projection technique due to (Yaglom, 1958) for spherical codes, and to (Sok et al., 2018) for deletion codes.</p></abstract>

Research on the International Education Model of Wuhan Institute of Technology under the New Development Pattern of Double Circulation

Research on the International Education Model of Wuhan Institute of Technology under the New Development Pattern of Double Circulation