Double Circulation Research Articles

Measurement and Thermodynamic Modeling for CO2 Solubility in the N-(2-Hydroxyethyl) Piperazine + Water System

Amine scrubbing is the most important technique for capturing CO2. The cyclic diamine N-(2-Hydroxyethyl)-piperazine (HEPZ), a derivative of piperazine, with good mutual solubility in aqueous solution, a low melting point, and a high boiling point, has the potential to replace PZ as an activator added in the mixed amine system to capture CO2. In this study, the solubility of CO2 in aqueous HEPZ solutions was determined for three HEPZ concentrations and four temperatures. The VLE data for HEPZ-H2O were obtained using a gas–liquid double circulation kettle at pressure 30–100 kPa, and the thermodynamic model for the HEPZ-H2O-CO2 system was built in Aspen Plus based on the electrolytic non-random two-liquid (ENRTL) activity model. The physical parameters for HEPZ and the interaction parameters for ENRTL, along with reaction constants of carbamate reactions, were regressed. Using the thermodynamic model, the CO2 cyclic capacity, speciation with loading, and heat of reaction for the CO2 capture system by the aqueous HEPZ solution are predicted and analyzed.

The impact of environmental regulations on export trade at provincial level in China: evidence from panel quantile regression.

Based on panel data from 30 provinces in China from 2008 to 2017, this paper constructs a quantile regression econometric model to analyze whether China’s environmental regulation has an impact on export trade and to verify whether the Porter hypothesis has been valid in China in recent years. The results show that in the short term, environmental regulations have a restraining effect on export trade, while in the long run, due to the existence of innovation efficiency, environmental regulations will change from having a restraining effect to a promoting effect on export trade. Strict environmental regulations will reduce the production cost of Chinese products, further improve the export competitiveness of Chinese enterprises, and promote export trade. The empirical results verify the conclusion that the Porter hypothesis is confirmed in China. The following three suggestions are proposed for China’s exports to promote the win–win of China’s green development and export trade: promote the realization of international and domestic double circulation, avoid becoming “pollution shelters” and support technological innovation in environmental protection industries.

One belt, one Road": China's place in the global model of "double circulation"

One belt, one Road": China's place in the global model of "double circulation"

An improved upper bound on self-dual codes over finite fields GF(11), GF(19), and GF(23)

This paper gives new methods of constructing symmetric self-dual codes over a finite field GF(q) where q is a power of an odd prime. These methods are motivated by the well-known Pless symmetry codes and quadratic double circulant codes. Using these methods, we construct an amount of symmetric self-dual codes over GF(11), GF(19), and GF(23) of every length less than 42. We also find 153 new self-dual codes up to equivalence: they are [32, 16, 12], [36, 18, 13], and [40, 20, 14] codes over GF(11), [36, 18, 14] and [40, 20, 15] codes over GF(19), and [32, 16, 12], [36, 18, 14], and [40, 20, 15] codes over GF(23). They all have new parameters with respect to self-dual codes. Consequently, we improve bounds on the highest minimum distance of self-dual codes, which have not been significantly updated for almost two decades.

The influence and countermeasures of digital economy on cultivating new driving force of high-quality economic development in Henan Province under the background of "double circulation".

This article focuses on the impact of the digital economy on cultivating new driving force of high-quality economic development in Henan Province and the countermeasures under the background of the "double circulation". Through the research on the status quo of Henan Province's digital economy and high-quality economic development, it is concluded that since the reform and opening up, Henan Province has achieved rapid and steady development at the macroeconomic level. Since the reform and opening up, the output value of the three main industries in Henan Province has continued to grow and the industrial structure has continuously optimized. However, in the domestic horizontal comparison, the economic development of Henan Province has not yet formed a prominent advantage. Henan Province still needs to further optimize the economic development structure and promote high-quality economic development. Through the theoretical and empirical analysis of the digital economy's high-quality economic development in Henan Province under the background of the "double circulation", this project found that the development of the digital economy promotes the cultivation of new driving force of high-quality economic development in Henan Province under the background of the "double circulation". Henan Province needs to make full use of the development opportunities of the digital economy under the background of the "double circulation", and adopts a variety of comprehensive measures to take advantage of the situation to promote the high-quality development of the province's economy. The research of this project believes that under the background of "double circulation", Henan Province uses the digital economy to cultivate New driving force for high-quality economic development. Although certain results have achieved, some problems have exposed, mainly including the lagging foundation of using the digital economy to cultivate high-quality economic development. Failed to make full use of the digital economy to cultivate leading companies that promote high-quality economic development, the government has not fully adapted to the digital economy’s demand for cultivating new driving force of high-quality economic development, and companies lack the talents to use the digital economy to promote their own innovation and high-quality development. Further in-depth exploration found that the factors for the above problems mainly include not deeply the dual nature of production and consumption of digital infrastructure construction under the background of "double circulation", but ignoring the "pull the ox by the nose (grasp the key link)" status of leading enterprises in the cultivation of new driving force of high-quality economic development. The enthusiasm for the transformation of government functions and the adjustment of organizational structure is insufficient, and there are obstacles, and the introduction and training system of high-quality professionals in the field of digital economy is lacking. Through the mechanism analysis of the digital economy on the high-quality economic development of Henan Province under the background of the "double circulation", the analysis of development issues and causes combined with relevant literature analysis and field investigations. The project puts forward the use of digital in Henan Province Countermeasures for the economy to cultivate new driving force of high-quality economic development. Henan Province's digital infrastructure construction builds a solid foundation for high-quality economic development. The consumption upgrades as the engine used to cultivate a group of leading companies at the high end of the industrial value chain, improves the government support system, builds a support system for high-quality economic development in Henan Province, and strengthens the digital economy of enterprises by the use of professional talent team building.

Research on The Statistical Measurement of Consumption Quality During the Covid-19 Pandemic

In 2020, the Central Committee of the Communist Party of China formally established the new development pattern of "take the domestic big circulation as the main body, the domestic and foreign double circulation" during the COVID-19 pandemic. Under the New Development Pattern angle of view, the consumption is the kinetic energy to turn "outside promotes the inside" to "inside promotes the outside". And the quality of consumption to a large extent reflects people's consumption. Consumption quality means that people's consumption is no longer limited to meet the most basic needs of life, but more attention to high-quality goods and service quality. With the improvement of consumption quality, people's physical and mental health develops more comprehensively, and social and economic development is more harmonious. In order to explore the growth of consumption quality, from the perspective of the new development pattern, we construct the consumption quality index system from four dimensions: The consumption quality of the consumer, the objective object of consumption, the external environment of the consumption society and the new development pattern, including 4 first-class indicators, 9 second-class indicators, and 15 third-class indicators. The factor comprehensive scores of consumption quality from 2001 to 2019 were obtained by principal component analysis.

Research on the Cluster Construction of China’s Semiconductor Industry Chain based on Dual Circulation Strategy

Based on the double circulation theory, this paper investigates and analyzes how to reconstruct and upgrade China’s semiconductor industry chain under the background of deglobalization, and puts forward some suggestions for the reconstruction of China’s semiconductor industry chain.

Does the Digital Economy Promote Industrial Structural Upgrading?—A Test of Mediating Effects Based on Heterogeneous Technological Innovation

This paper proves that the development of the digital economy has become a new vector to promote the upgrading of China’s industrial structure. In addition, heterogeneous technological innovation plays an intermediary role in the promotion of the industrial structure by the digital economy. This study aims to solve the following: whether the development level of the digital economy is positively promoting the upgrading of the industrial structure; whether technological innovation can promote the upgrading of the industrial structure; the path of the digital economy through which to promote the upgrading of the industrial structure and the heterogeneity of this path. The purpose of this study was to verify the digital economy and scientific and technological innovation to promote the upgrading of the industrial structure and the reality of the realization path; and to solve the problem of insufficient power for upgrading China’s regional industrial structure against the background of the impact of the new generation of information technology. This study mainly adopted comprehensive evaluation and multivariate statistical analysis methods. The statistical basis for the study was data from 30 Chinese provinces from 2013 to 2018. The results confirm the hypothesis that the development of the digital economy and scientific and technological innovation have a positive role in promoting the upgrading of the industrial structure, and also prove that the intermediary role of heterogeneous technological innovation is crucial in the process of the digital economy promoting industrial upgrading. This conclusion can further give play to the role of the digital economy in promoting industrial structure upgrading, build a clean and intelligent industrial chain, solve the root cause of the lack of new drivers for China’s industrial upgrading, and help to form a new development pattern of domestic and international double circulation, so as to achieve the high-quality and sustainable development of China’s economy.

Constructing the Double Circulation of Capital and "Social Impact": An Ethnographic Study of a French Impact Investment Fund

Constructing the Double Circulation of Capital and "Social Impact": An Ethnographic Study of a French Impact Investment Fund

ОЦЕНКА ПЕРСПЕКТИВ ИННОВАЦИОННО-ТЕХНОЛОГИЧЕСКОГО РАЗВИТИЯ КИТАЯ

This article attempts to study the diverse responses to the political appeal of the Chinese leadership to innovation and assess the prospects for innovative and technological development in China. Thus, the contribution of this article is somewhat specific to China, but at the same time there are General ideas that are relevant for all middle-income countries, especially for Russia, where there is an urgent demand for an innovation-oriented economic transition. The paper shows that the key factors of successful innovation and technological development in China include: a phased experimental approach; purposefulness; and active state support. Specific lessons include: the rapid expansion of education and science systems; higher wages, as well as social and environmental standards; engagement in international scientific and investment cooperation; and the triple Alliance between government, industry, and science. Specific risks for realizing the innovative potential of the Chinese economy are: going beyond global norms (for example, in relation to intellectual property), implementing a "double circulation" policy with a focus on domestic demand and a localization strategy.

The effect of baffle on flow structures and dynamics stirred by pitch blade turbine

•In order for a better understanding of how baffle impacts on the flow field stirred by pitched blade turbine (PBT), the Particle Image Velocimetry (PIV) experiment was conducted in baffled and unbaffled tank, with time-averaged method, phase-resolved method and Proper Orthogonal Decomposition (POD) method applied to analyze the turbulent characteristics. The POD quadruple decomposition method was adopted to decompose the flow structures of different scales. As indicated by the experimental results, in the measured area, an independent circulation area develops under the impeller, thus forming a pattern of double circulation flow in the unbaffled tank. There is a relatively concentrated distribution of incoherent flow structures in the stirred flow field, and these small-scale flow structures hinder transfer to the whole stirred tank, which makes it easy for the difference in local concentration to arise. With the addition of baffle, the axial discharge of fluid is enhanced, and the independent circulation area under the turbine shows change, and the large-scale convection of main body develops. The stirring-induced incoherent flow structure shows a wider range of distribution, while the small-scale structure under the stirring tank creates a more favorable condition for the diffusion into the whole stirred tank.

Self-dual and LCD double circulant and double negacirculant codes over $${\mathbb {F}}_q+u{\mathbb {F}}_q+v{\mathbb {F}}_q$$

Let q be an odd prime power, and denote by $${\mathbb {F}}_q$$ the finite field with q elements. In this paper, we consider the ring $$R={\mathbb {F}}_q+u{\mathbb {F}}_q+v{\mathbb {F}}_q$$ , where $$u^2=u, v^2=v,uv=vu=0$$ and study double circulant and double negacirculant codes over this ring. We first obtain the necessary and sufficient conditions for a double circulant code to be self-dual (resp. LCD). Then we enumerate self-dual and LCD double circulant and double negacirculant codes over R. Last but not the least, we show that the family of Gray images of self-dual and LCD double circulant codes over R are good. Several numerical examples of self-dual and LCD codes over $${\mathbb {F}}_5$$ as the Gray images of these codes over R are given in short lengths.

The Theoretical Logic and Implementation Path of Constructing the New Development Pattern of “Double Circulation” from the Perspective of Political Economy

This paper based on the theory of marxist political economics “binary” thought, puts forward total contradiction movement in the process of social production is a new development pattern of “binary” theoretical basis, establishes a new development pattern of “binary” rely on “factor market”, “product marketing”, and needs to make full use of the domestic market on the basis of expanding the international market “market space”. At the same time, it definitely points out that “efficient market” and “efficient government” are the fundamental guarantee of the new development pattern of “double circulation”. The constraint conditions of constructing the new development pattern of “double circulation” are analyzed from four dimensions: economic system, innovation ability of market subjects, regional location and industrial structure. Finally, according to the realistic constraints of constructing the new development pattern of “double circulation”, the paper puts forward the concrete implementation path: in the top-level design of the economic system, the market should play a decisive role in the allocation of resources, and the government should play a greater role; in the aspect of cultivating the innovation ability of market subjects, we should implement the innovation-driven strategy and promote comprehensive innovation with scientific and technological innovation as the core. In terms of regional and regional cooperation and development, we will coordinate regional development internally and integrate into the global economy in an all-round way externally. At the level of industrial structure optimization and upgrading, efforts should be made to optimize the supply-side structural reform and strive to achieve a benign interaction between supply and demand.

Территория требует связной работы: роль межрегиональных взаимодействий в восстановлении экономики (к 100-летию работы И.Г. Александрова «Экономическое районирование России»)

The coronavirus pandemic has acted as a catalyst for discussions on the choice of economic policies for recovery from the crisis. This research focuses on one of the aspects of this problem, aiming to analyse interregional interactions, the activation of which can become a driver of growth. Based on the idea of ‘double circulation’ from the China’s 14th Five-Year Plan, we demonstrate that Russia also has the ability to shift the focus of economic policy towards expanding the domestic market and developing ties between regions. The paper draws parallels between the early 1920s and 2020s. It is noted that the need to overcome economic depression was determined by justifying close cooperation of individual regions in Russia. The article describes the use of interregional interactions as a tool for spatial development based on the existing federal strategic plans. The study demonstrates that that the task of strengthening interregional interactions is only briefly touched upon in the plans. However, it is important to note that this process balances the constraints and opportunities for the development of the whole country. The analysis of the spatial markets’ hierarchy in the context of economic macro-regions revealed their incomplete nature as complete economic systems. The obtained results show that in order for the idea of macro-regions to actually work, real interregional projects should appear inside of these macro-regions. It is determined that on the international level the demand for special tools for enhancing interregional interactions is gradually growing. The author proposes measures based on successful examples to support such interregional interactions in Russia. Finally, the author concludes that in the current situation the increase in interregional interactions can positively affect the economic development of Russia as well as create new spatially distributed value-added chains

An Empirical Study on the Effect of Agricultural Infrastructure Investment on Economic Growth

In this paper, using the panel data of the National Bureau of Statistics database from 2010 to 2019, and using the random effect model, we studied the impact of agricultural infrastructure investment on economic growth. The empirical results show that the investment in agricultural infrastructure can significantly improve the national economy, among which the investment in new infrastructure promotes the economic growth to a certain extent. After comparing the eastern, central and western regions, it is found that the investment in agricultural infrastructure in the western region contributes more to the economic growth, and the statistical results are more significant. Based on the analysis of the role of agricultural infrastructure investment in promoting economic growth, this paper will further discuss the relevant suggestions of the “two new and one heavy” policy in the agricultural field, and promote the adjustment of agricultural industrial structure with the improvement of agricultural infrastructure, and promote the formation of a new development pattern of “double circulation”.

Research on the Key Path to Improve the Collaborative Innovation Performance of Port Logistics Enterprise Cluster

Under the new pattern of international and domestic double circulation, the scale of China's port logistics enterprise cluster is expanding, but the innovation difficulty of cluster enterprises is increasing sharply, the innovation power of core technology is insufficient, there are some problems, such as focusing on agglomeration rather than cooperation, the integration of industrial chain and innovation chain is not close, and the choice of innovation path is improper. The method and purpose of this paper are based on the theory of collaborative innovation, establish a structural equation model, empirically test the logistics clusters with ports above designated size in China, and put forward the key path for the collaborative innovation of port logistics enterprise clusters, and improve the collaboration degree and innovation performance of cluster enterprises. The empirical results show that the external environment of collaborative innovation (EECCI), the innovation learning ability of cluster enterprises (ILACE) and the cluster enterprises cooperation (CEC) can directly or indirectly affect the cluster collaborative innovation performance (CCIP), and the innovation learning ability of cluster enterprises (ILACE) plays a mediating role between the external environment of collaborative innovation (EECCI) and the cluster collaborative innovation performance (CCIP). Port logistics enterprise clusters need to develop environmental governance, knowledge governance, information governance and other mechanisms to promote collaborative innovation in the industrial chain, technology chain and value chain.

Study on the Countermeasures of Stable Investment Growth under the Background of Economic Internal Circulation—Take Wudi County as an Example

It is a correct decision made by the party and the government to construct a new development pattern in which the domestic big circulation is the main body and the domestic and international double circulation promotes each other. This paper will take Wudi County as an example, from the perspective of investment, further analyze the existing problems in investment in Wudi County on the basis of analyzing the internal logic of realizing internal circulation of investment, and put forward specific solutions.

Increased expression of LCN2 formed a positive feedback loop with activation of the ERK pathway in human kidney cells during kidney stone formation

Kidney stones are a common threat to the health of elderly patients with a high incidence of disease. However, the specific molecular mechanism of the formation of kidney stones has not been elucidated. Here, we combined signalling molecules with signalling pathways in a double positive circulation regulation model. In addition, we found that LCN2 plays a role in promoting kidney stones through regulation of the ERK signalling pathway and expression of other kidney stone-related genes. LCN2 expression was upregulated upon oxalate stimulation. P-ERK1/2 inhibition by U0126 in kidney epithelial cells resulted in decreased expression of LCN2. Furthermore, the upregulation of LCN2 not only depended on the activation of the ERK signalling pathway but also regulated the activation of the ERK signalling pathway. Importantly, upregulation of LCN2 not only caused kidney epithelial cell damage but also promoted the expression of other kidney stone-related genes. Our findings improved the understanding of LCN2 and might lead to the development of new therapeutic and prognostic markers for kidney stones.

A Review of the Influence of Rural Public Goods Supply on Rural Residents’ Consumption—A Case Study of 2009-2019

The supply of rural public goods and the consumption of rural residents are not only an important symbol of the quality of life of rural residents, but also reflect the satisfaction of the majority of rural residents to a better life. At the same time, the supply of rural public goods and the consumption of rural residents are also the “engine” and “ballast stone”. The supply of rural public goods and the consumption of rural residents are the “Chinese experience” to solve the crisis. In the early days of the founding of the people’s Republic of China, the reform and opening up of the production package, the soft landing of the 2008 financial tsunami was a solution to the crisis by adjusting the supply of rural public goods. In the face of the complex situation of the current international economy and the influence of the epidemic situation, a new development pattern with the large domestic circulation as the main body and the domestic and international double circulation promoting each other can not only resolve the overproduction of the city, but also realize the redistribution of urban and rural resources by stimulating consumption. The research on the supply of rural public goods in China has been fruitful. From 2009 to 2019, there were 2729 articles on the supply of rural public goods and the consumption of rural residents.

Performance of DOuble Circulation Anaerobic Sludge bed reactor: Biomass self-balance

The calcification of Anaerobic Granular Sludge is a serious problem in the application of anaerobic methanization biotechnology. Regular replacement of calcified sludge with exogenous sludge is an effective method, but it is costly and troublesome. A new DOuble Circulation Anaerobic Sludge bed reactor was developed for the enhanced production of endogenous sludge to self-balance the discharge of calcified sludge. The sludge washout rate was demonstrated to fall by 45% and the sludge proliferation rate was shown to rise by 230%, offsetting the regular discharge of calcified sludge. The zoogloea in 100 μm dimension was revealed to be the intermediate component of sludge. The sludge proliferation mode was proposed as follows: (i) Growth of sludge; (ii) Self-cracking of sludge to release fragmental sludge; (iii) Migration of fragmental sludge by self-floatation; (iv) Accumulation of suspended sludge in the sedimentation chamber; (v) Re-granulation of suspended sludge with the aid of Venturi effect.