Pole Theory Research Articles

Overview of welding defect detection utilising metal magnetic memory technology

Welded joints frequently endure the composite stress of steel components. The presence of defects within these welded joints can significantly jeopardise the safety and performance of the welded structure. Magnetic memory testing technology has garnered substantial attention due to its ability to evaluate welding defects. However, the conventional zero-point pole theory, which serves as the foundation for defect assessment in practical detection, may lead to defect location and omission errors. In response to this challenge, scholars have conducted extensive research to accurately pinpoint the location and identify the types of defect within welds. This paper systematically reviews the mechanisms of magnetic memory welding defect detection, the factors that influence it, signal characteristic parameters, noise reduction in magnetic memory signals and the application of machine learning for quantitative assessment. By summarising these research advancements, this paper aims to address the current issues and provide guidance for the precise quantitative evaluation of welding defects in the future using metal magnetic memory technology.

Tourism Communication Policy in Sustainable Tourism and Climate Change in Garut Regency

The tourism sector as one of the drivers of the Indonesian economy is also affected by natural and non-natural disasters. Climate change and disasters encourage the government of Garut Regency in West Java, Indonesia, to carry out various tourism communication policies as part of the effort to increase sustainable tourism activities in the face of climate change and disasters. This research aims to find a model of sustainable tourism communication policy in the face of climate change in Garut Regency. This research uses symbolic interactionism theory, growth pole theory and Community Based Tourism (CBT). The exchange of symbols between tourism actors will build a common meaning in making sustainable tourism communication policies. The type of research used a case study with a research location in Garut Regency, a tourist site as well as a disaster-prone area. Data collection techniques were carried out through observation, interviews and documentation. Data validity used data triangulation, investigator triangulation, and theory triangulation. The results showed that the policy used in the development of sustainable tourism in Garut Regency emphasizes collaboration and communication of all stakeholders. The involvement of all stakeholders will encourage the realization of community welfare. The focus of sustainable tourism development is the community. Community welfare will be achieved if the community is fully involved in all tourism activities.

Multi-Dimensional Evaluation of the Construction Effect of the Agricultural Science and Technology Parks in Shandong Province, China - Based on Growth Pole Theory

Multi-Dimensional Evaluation of the Construction Effect of the Agricultural Science and Technology Parks in Shandong Province, China - Based on Growth Pole Theory

Rethinking Afriruralization for fiscal policy of economic sustainability of Nigeria: Interrogating François Perroux’s growth poles theory.

Migration today occurs because of urbanisation and industrialization at varied degrees in every country for a better life. This paper thus focuses on the process of implementing fiscal policy of economic ruralisation development through the pragmatism of glocal contents for an economic sustainability. Thus, using the concept of Glocalization or Glocalization (a portmanteau of globalization and localism) in the simultaneous universalizing and particularizing Afriruralization tendencies in contemporary social, political, and economic systems. The question how Afriruralization can influence its realisation in countries like Nigeria require urgent interrogation. In interrogating François Perroux’s growth poles theory, this work presents arguments in support of the proposition that Afriruralization is an inevitable component of the development process, through diversification which necessarily could result in propitious stimulus. This wave of analysis could bring about what we termed glocal afriruralization theory. With value-laden policies, this process can occur at a socially acceptable level. However, given the distortion of opportunities in favour of cities in most developing countries, Nigeria not excluded, the costs of livelihood associated with urbanisation often offset the benefits, leading to disproportionate ruralisation. To this end, glocal Afriruralization theory which is back to baseruralisation is the option for reinventive, creative and resourceful diversification development culture needed for growth.

Perspectives on regional science in studies of public participation in higher education

Purpose: of this paper is to characterize the potential of regional theories in solving the current scientific socio-economic problem of establishing the interaction between society and the system of higher education.Methods: the processes of interaction between society and higher education are considered through the prism of separate approaches and concepts of the scientific paradigm of regional economics, to solve the set goal.Results: based on statistical data, significant regional differentiation of higher education system in modern Russia is shown, which actualizes its study through the prism of regional scientific paradigm. Through systematization of existing experience of interaction between universities and society in Sverdlovsk region the role of universities as coordinators of public participation in the spatial development of the region is shown. By applying methodological apparatus of specific theories of regional paradigm, their cognitive potential in the sphere of educational social relations analysis as well as possibilities of identification of problems of public participation in higher education are revealed. In particular, the gnoseological possibilities of the spatial approach are substantiated. The characteristics of the last reform of higher education, which entailed the segregation of universities in the context of applying the theory of growth poles, are given. The article shows the prospects for regional development through the application of the methodology of the theory "center–periphery", usingthe example of correcting staff imbalances of the small towns. The practical significance of applying the theory of "genetic" codes in the study and interpretation of the causes of low intensity and quality of public participation in higher education was characterized. The methodological possibilities of using institutional mesoeconomics, coordination theory, mesoeconomics of network structures, and cluster theory in studying the experience of interaction between higher education institutions and society in the regional context were substantiated.Conclusions and Relevance: the interpretation of the region in the context of mesoeconomics stipulates the necessity and possibility to form an independent theoretical and methodological apparatus for studying regional systems of higher education and apply special tools for analysis and identification of problems of public participation in higher education on specific territories.

National Central Cities: Unravelling A Chinese urban policy puzzle

This paper critically examines a recent innovation in Chinese urban policy: the designation of a new category of ‘National Central Cities’ (NCCs). These cities, of which there are currently nine, are meant to play a key role in economic modernisation and national economic development. But, despite their undoubted importance, their precise role, definition and function and their basis of designation is unclear. The paper argues first that the underlying, but implicit, theoretical rationale is growth pole theory and that the cities are meant to play a major role in the diffusion and ‘radiation’ of economic growth and other forms of development in their regional hinterlands. The paper also examines the geographical distribution of NCCs in China and looks at their ranking compared to other cities in terms of a number of different indicators such as GDP and population and asks why some cities have been chosen and not others. What is the basis of NCC designation? Finally, it speculates on the future number and distribution of NCCs, the competition for new designation and the possible benefits designation may confer.

Synchronization dynamics of phase oscillators with generic adaptive coupling

Adaptive coupling schemes among interacting elements are ubiquitous in real systems ranging from physics and chemistry to neuroscience and have attracted much attention in recent years. Here, we extend the Kuramoto model by considering a particular adaptive scheme in a system of globally coupled oscillators. The homogeneous coupling is correlated with the global coherence of the population that is weighted by the generic nonlinear feedback function of the amplitude of the order parameter. The studied model is analytically tractable that generalizes the theory of Kuramoto for synchronization transition. We develop a mean-field theory by establishing the self-consistent equation describing the stationary dynamics in the thermodynamic limit. Importantly, the Landau damping effect, which turns out to be far more generic, is revealed in the framework of the linear stability analysis of the resonant pole theory. Furthermore, the relaxation rate of the order parameter in the subcritical region is obtained from a universal formula. Our study can deepen the understanding of synchronization transitions and other related collective dynamics in networked oscillators with adaptive interaction schemes.

Terahertz all-dielectric metasurface sensor based on quasi-bound states in the continuum.

We proposed a quasi-bound states in the continuum (QBICs) metasurface to realize sensing in the terahertz band. It consists of silicon split ellipse cylinders with different short-long axes and a quartz substrate. By introducing two asymmetric split ellipse cylinders unit cells, magnetic dipole and electric quadrupole resonances of the proposed structure are investigated by multiple Pole theory. This shows that the continuum bound states are transformed into quasi-BICs by tuning the length of the ellipse long axis, and so a high-quality factor can be obtained. The Q value of the proposed structure is 3205, and the figure of merit is 469.64. It has potential applications in gas, liquid, and biomaterial sensing.

Пространственное регулирование развития старопромышленных территорий: теоретический аспект

Achievement of the effectiveness of programs and activities of the state regional policy in relation to various types of regions requires constant development of its methodological basis in order to take into account the most relevant achievements of domestic and foreign scientific thought. The purpose of the article is to summarize the theoretical foundations of spatial regulation and regional development of regional policy in relation to old industrial territories, taking into account the features and problems of their functioning and development. It is shown that foreign and domestic scientists associate the phenomenon of old industry with the achievement of the limit of growth of the regional economy. The theoretical basis of modern regional policy is the theories of spatial economics, first of all, the theory of poles (centers) of growth. The evolutionary approach to solving the problems of old industrial regions is widely used in the practice of public administration. At the turn of the 20th – 21st centuries, the conceptual provisions of the theory of the creative class and the concept of the “learning region” began to be used in the establishment of state programs to support old industrial territories. The study of theoretical approaches to the problems of spatial regulation and regional development showed that regional social and economic policy, coordinated with the macroeconomic policy of the state, is a necessary condition for the resolution of territorial contradictions in the development of the national economy, while the policy of regional authorities is considered as a key factor in ensuring sustainable social and economic development of old industrial territories. Specific threats to the old industrial regions’ sustainable socio-economic development require special support, as well as the reflection of the priorities of state support for old industrial territories in the key document of spatial strategizing. It is the Spatial Development Strategy of the Russian Federation.

Giersch’s “Volcano” Model and its Application for the Analysis of Regional Disparities in Russia

Relevance. Considerable regional disparities in Russia pose a threat to the country’s economic security, which makes the task of identifying and supporting underperforming regions especially urgent. Research objective. The purpose of the study is to identify the struggling regions by using the "volcano" model. This model has not been previously used in studies on economic space features, which determines the novelty of the proposed research. We are also going to describe the possible ways to support these regions. Data and methods. The study uses correlation analysis to investigate the dependence of GRP of 85 Russian regions on the degree of their remoteness from the ‘vent’ region – the Khanty-Mansi Autonomous Area–Yugra. The analysis was carried out on the basis of cross-sectional data for 2018-2020. The study relies on the data on GRP provided by the Federal State Statistics Service (Rosstat). Results. The results of this study showed that, according to H.Giersch’s methodology, the Khanty-Mansi Autonomous Area-Yugra is the "vent" of the "volcano". By applying this methodology, we have also identified 13 struggling regions. An effective measure to support these regions is to transfer the federal component of the corporate income tax and VAT revenues to their budgets. Meanwhile, the volume of transfers provided to them from the federal budget should remain unchanged. Our calculations show that this measure can create a significant increase in GRP of the Russian regions at the aggregate level, exceeding considerably the losses of the federal budget. Conclusions. The study has shown that the ‘volcano’ models is better suited for the analysis of such countries as Russia, because it makes the research less time-consuming in comparison with the growth poles theory. The results of this study can be used by policy-makers developing the state fiscal policy.

The Impact and Internal Mechanism of Environmental Decentralization on Green Total Factor Production

Since the emergence of environmental federalism theory in the 1960s, the empirical research on it has been pursued by scholars, mainly focusing on whether a country’s environmental regulation should be centralized or decentralized. For a long time, countries have been actively exploring and putting environmental governance systems into practice for themselves, especially at present, in the face of multiple constraints of resources, environment, sustainable development power and other factors. How to build an appropriate environmental governance system and promote the level of green development by encouraging enterprises’ technological innovation is a practical problem to be solved urgently. Based on this, this paper constructs a new research framework of environmental decentralization—technological innovation—green total factor productivity (GTFP) and investigates the effect and mechanism of environmental decentralization on GTFP. The results show that environmental decentralization can reduce the quality of environmental information disclosure and inhibit the innovative output of enterprises, ultimately leading to the decrease of GTFP. Environmental decentralization has a spatial spillover effect on GTFP, which can promote GTFP in neighboring areas. This paper tries to enrich the research results of traditional environmental federalism theory, the “Porter Hypothesis”, and growth pole theory, and it provides a solution to enterprises’ financing constraint problem.

Decoding the Multidimensional Structuring of Urban Poles of Growth of Nighttime Economics—An Inter-Discipline Study in Lanzhou City, China, Based on Geomodeling and Big Data

The nighttime economy, or NTE—the combination of nocturnal specialties and the extension of the diurnal economy into the night—has been implemented as an effective boosting instrument set to “revitalize the urban space”. The instrument, applied in regions around world, develops new socioeconomic dynamics and poles of growth within cities. Although some cases emphasize the functional success of NTE practices, disequilibrium between urban elements—social groups, communities, and the cultures in which they live—are ongoing. The present article argues that urban nights must be considered within a broader reflection on the question of sustainability because a closer integration between brands, cultural elements, employment, and capital in different scales is demonstrated at night. Based on growth pole theory, this study combines data mining, spatial modeling, and other complementary approaches, and successfully (1) identifies the growth poles of the NTE in Lanzhou City, a postindustrial city transitioning towards a nighttime economy that forms dotted and non-uniform nocturnal zones through its geography and demography; (2) characterizes their socioeconomic organization, and (3) analyzes various causes and manifestations of the disequilibrium.

An Assessment of the Spatial Distribution of Infrastructural Facilities in the Northern Senatorial District of Taraba State, Nigeria

The distribution and location of infrastructural facilities are important indicators of government involvement and democratic accountability dividends throughout developing rural areas. This study assessed the spatial distribution of infrastructural facilities in the Northern Senatorial District of Taraba State. Utilising the Growth Pole theory and the exploratory research design, the study adopted the quantitative and qualitative methods comprising of questionnaire administration, interviews, and observations and the handheld GPS device to get coordinates for ArcGIS spatial analysis to carry out the study in three local government areas (Ardo Kola, Lau, and Zing LGAs) purposefully selected from the district. The Krejcie and Morgan determining sample size statistics were used to generate a study sample of 384 from a projected population of 415,100 in the three local government areas. The study found that even though the infrastructural facilities have yielded positive development in the areas, they are located based on government projected interests. It concludes that infrastructural facilities should be dispersed fairly to benefit the general public, particularly in areas in desperate need. It is also suggested that the government should support host communities' efforts to maintain public facilities.

Study on the Contribution of Seaport to Urban Economy: An Empirical and Quantitative Analysis of Xiamen Port

Ports play a vital role in the development of cities. In order to study the contribution of seaports to the urban economy, this paper uses the input–output method and multiplier theory to calculate the direct, indirect, and ripple economic contribution of ports to cities. Then, this paper selects Xiamen Port as an example to calculate the economic contribution. Xiamen Port is a major port on the southeast coast of China and an important node of the 21st Century Maritime Silk Road. It can provide a reference for other port cities. A more detailed index system for evaluating the economic contribution is also constructed. Next, the time series ARIMA model is used to predict the cargo throughput and container throughput of Xiamen Port in the next four years. Finally, there are some suggestions put forward for the development of Xiamen Port. The results show the total economic contribution of Xiamen Port to the city accounted for 10.48% of the city’s GDP in 2017. Direct, indirect, and ripple economic contributions accounted for 2.84%, 2.13%, and 5.51%, respectively. The contribution of Xiamen Port to the city is in line with the growth pole theory, which not only allows for rapid growth in Xiamen Port itself but also drives the development of the entire region through the multiplier effect. The cargo throughput and container throughput of Xiamen Port will maintain continuous growth in the next four years. Therefore, the development of Xiamen Port should be accelerated to enhance its economic contribution to the city.

Study on credit expansion to coordinated development of Urban agglomeration economy

According to the growth pole theory, financial agglomeration has an important impact on economic growth and coordinated development of regional economy.How to realize regional coordinated development through optimal allocation of factors of production has become an important problem in regional economics in the new era.Based on the urban agglomeration mentioned in the "14th Five-Year Plan", this paper firstly evaluates the coordinated development of regional economy, and then studies the spatial effect of credit expansion, discusses the factors influencing the backflow effect and diffusion effect of credit expansion, so as to put forward policy suggestions for the coordinated development of financial support.

Modeling and Analysis of Low-Frequency Oscillation for Electrified Railway under Mixed Operation of Passenger and Freight Trains

Addressing the shortcomings of existing low-frequency oscillation research on electrified railways, which has mainly focused on single-type trains and lacks the accurate modeling of traction inverter systems, in this paper we modeled and analyzed low-frequency oscillations in an electrified railway passenger and freight mixed-operation vehicle–grid system. First, an equivalent model of the DC side of the traction inverter was established, with the inverter system being equivalent to the parallel connection of the load resistance and the current source, and the specific mathematical expression was determined and verified by impedance measurement. Secondly, based on the equivalent model of the DC side of the traction inverter, a small signal model of the vehicle–grid system under the mixed operating conditions of CRH5 and HXD2B considering the inverter system was established. The generalized Nyqusit criterion was used to study the low-frequency oscillation characteristics under mixed transportation conditions. The accuracy of the established model and the correctness of the theoretical analysis were verified based on Matlab/Simulink. Finally, using the dominant pole theory to analyze the low-frequency stability conditions, the relationship between the number of mixed trains and the minimum short-circuit ratio was obtained, and the simulation verification was carried out.

An Optimization Method of Sports Service Network Layout Based on Network Communication

Sports culture industry (CI), as a new sunrise industry, has achieved unprecedented development in the world, and many developed countries regard it as a pillar industry. In our country, the sports CI is quickly growing and contributing significantly to national economic growth. The layout mode of the sports CI is crucial in identifying regional growth advantages and resource development, as well as maximizing industrial function allocation and creating sports CI development strategy. This paper takes Dalian’s sports CI as the research object and expounds the concept of sports culture, sports CI, and spatial layout of sports CI through analyzing and sorting out previous research results. This study analyses the evolution and spatial distribution of the Dalian sports CI, as well as the current challenges, using theories and methodologies from sports science and economic geography and proposes countermeasures for Dalian to develop its sports CI. Regional development theories, such as central place theory, growth pole theory, point axis theory, and Maslow’s hierarchy of needs theory, have important theoretical value and practical guiding significance for the rationalization of spatial distribution of Dalian sports CI. On the basis of analyzing the resources, traffic network, and economic development of Dalian sports CI, the paper constructs the spatial distribution mode of Dalian sports CI, namely, two core points, three development axes, and multiple nodes, and puts forward the measures to optimize the spatial distribution of Dalian sports CI. This paper examines the current condition, resource architecture, and major structure of supply of leisure sports service items in the Zhejiang coastline area using the literature and field inquiry methodologies. On this basis, the optimization countermeasures of combining Zhejiang coastal leisure sports service products with recreational fishery and yacht economy are put forward to perfect the system of coastal leisure sports service products and improve the supply capacity.

SUPPORT FOR CLUSTER INITIATIVES AND CLUSTER POLICY (CASE STUDY OF THE EUROREGION "THE LOWER DANUBE")

The purpose of the article is to investigate the essence and significance of the cluster initiative and the cluster policy as tools for strategic development and increasing of the economy competitiveness of the Euroregion “The Lower Danube” based on the analysis of factors providing state support for cluster initiatives in the context of the promotion of the European Union Strategy for the Danube Region. The theoretical and methodological background is the works of Ukrainian and foreign academic economists studying general systems theory, systemic analysis, and also strategic planning methodology at enterprise, regional and national levels. The research is based on the fundamental provisions of economic theory, the theory of strategic planning, institutionalism, regional and global economics, cluster theory, the location theory, the growth pole theory, M. Porter’s competitive theory, networked economy theory, spatial economic agglomeration, as well as modern theoretical developments on the problems of formation and implementation of the Euroregional policy of the EU. The research hypothesis is the assumption that the cluster approach is the most effective mechanism for the development of international economic cooperation in modern conditions and, eventually, the meso-level of competitive cross-border integration systems and a necessary requirement for qualitative growth of Ukraine’s integration into the European Economic Area. The goal statement can be described as a meso-economic synthesis of concepts of the development of innovation clusters and international integration associations. Based on the analysis of problems of formation and development of clusters, the methods and tools of state support of cluster initiatives are explained, and the most important strategic directions of activity of executive bodies aimed at stimulating the processes of formation and development of clusters in the Euroregion “The Lower Danube” are formulated. Cluster policy aimed at stimulating cluster initiatives with a further formation of cross-border innovation clusters can be considered as one of the effective tools for intensifying innovation activity in the Euroregion “The Lower Danube”. The authors conclude that the creation of cross-border clusters in the Euroregion “The Lower Danube” with the participation of Odesa region of Ukraine is associated with the necessity to form a united cross-border area. At the same time, the state is given a leading role in ensuring a favorable cluster environment (including the reduction of barriers to trade) and stimulating international cooperation. It is proposed to develop meso-level integration processes within the Common Economic Space of Euroregions, with the active participation of Ukraine on the basis of a cluster approach, forming cross-border cluster systems based on competition, cross-border cooperation, virtualization of interinstitutional networks and formation of “clouds” of highly efficient intercluster interactions.

Regional Differentiation and Influencing Factor Analysis of Residents' Psychological Status during the Early Stage of the COVID-19 Pandemic in South China.

A scientific understanding of the impact of COVID-19 on the psychological status of residents is important for improving medical services and responding to public health emergencies. With the help of some of the most popular network communication tools (including Wechat and Weiboand QQ), online questionnaires were completed by South China citizens during the early stage of the COVID-19 pandemic based on psychological stress theory and using a comprehensive sampling method. Through cooperation with experts from other institutions, the content of the questionnaire was designed to include interviewees’ spatial locations and individual information, identify whether negative emotions were generated, and determine the level of psychological stress and the degree of perception change, etc. According to the data type, mathematical statistics and multiple logistic regression methods were used to examine regional differentiation and influencing factors regarding the psychological stress of residents using 1668 valid questionnaires from 53 municipal administrative units in South China. The results firstly showed that over the whole area there was typical regional differentiation in South China, especially in relation to negative expression and psychological stress, with this feature reflecting the dual urban–rural structure. Secondly, regional differences were obvious. Residents of Hainan showed stronger change of psychological stress than those of the other two provinces. In contrast, Guangdong residents were the least psychological stress, and the concept of a harmonious relationship between human beings and nature was not accepted as well as in the other two provinces. Thirdly, in each province the capital city acted as the regional pole, with greater psychological status. This polarization effect decreased with greater distance, reflecting the theory of growth poles in human geography. Fourthly, gender, education level, occupation, informational correction, and the possibility of infection were notable factors that affected the psychological status of interviewees facing COVID-19. However, the functions were different and were decided by the dependent variable. Lastly, based on conclusions summarized from three perspectives, it was found that regional differentiation, public information, and social structure need to focused upon in order to handle sudden major health issues.

A theoretical foundation for investigating the spatial economic attributes of airport-centric developments

Abstract Among the various areas of interest on the topic of airports and the geographical distribution of land use, one pertinent theme is the spatial economic analysis of airports and their environs. However, the existing literature predominantly focuses on describing the land-use composition of airport-centric developments, without unpacking the spatial economic forces at play. This gap brings to the fore the need to employ an appropriate theoretical lens to guide the spatial economic analysis of airports and their environs. The aim of this theoretical review paper is thus to identify concepts that are relevant to the analysis of airports and their environs; and to use those concepts to systematically identify the existing theory that is most suitable for investigating the spatial economic forces that drive airport-centric developments. Against the background of globalisation, we scrutinise classical location theories, regional science, growth pole theory and new economic geography against their relational interpretations of the concepts of space, proximity, firm, scale and pattern. Given that it portrays a relational perspective of the aforesaid concepts, the paper concludes that growth pole theory is suitable as the main framework for analysing airport-centric developments. It is therefore recommended that growth pole theory be empirically used to guide the analysis of airports and their environs, and subsequently be used as the basis for developing a theoretical framework tailored for airport-centric developments.