Migration Theory Research Articles

Charge-Compensation-Driven Failure Mechanism of Ni Redox in Fe-Rich Ni/Fe/Mn-Based O3-Type Layered Oxide Sodium-Ion Cathodes.

For cathode materials of sodium-ion batteries, O3-type Ni/Fe/Mn-based (Na-NFM) layered oxides have garnered extensive attention because of high economic viability, environmental friendliness, and the potential for high energy density. Among them, Fe-rich compositions exhibit higher initial charge capacity and lower bill-of-material costs, while they fade rapidly and exhibit low initial coulombic efficiency, hindering their commercialization prospects. In this work, we investigate the failure of Fe-rich Na-NFM materials through X-ray absorption spectroscopy methods. The results reveal a combined failure mechanism that encompasses not only the conventional theory of Fe migration but also an abnormal Ni-redox deterioration, which has not yet been reported. More factors related to the failure of Fe-rich Na-NFM layered oxides are discussed in detail. These findings are expected to inspire targeted research efforts toward Fe-rich Na-NFM materials, thereby accelerating the practical application of sodium-ion batteries.

Migration and Identity: A Rereading of the Child in Matthew 2:13-23

Abstract Naming is a personal and powerful action, often tied to the identity of an individual. In the Gospel of Matthew, Jesus’ name is chosen with great care, only to be almost immediately cast aside in favor of the generic form “the child” throughout his childhood in exile. This article reads Matthew 2:13-23 through a childist lens, combining migration theory with attention to the obfuscation of the child Jesus’ identity to elucidate both the experiences represented in the Gospel account, as well as its enduring significance for generations of migrant communities living into their identities today. Seeking to read Matthew 2 together with refugee communities today, this reading highlights the limits of constructed identities such as borders, nation states, and even names, while tracing the child Jesus’ development in the infancy narrative of Matthew.

Xenophobia as the major plight of African immigrants in South Africa: the example of Epiphanie Mukasano's selected poems

ABSTRACT The attacks on African immigrants in South Africa have generated a lot of media attention both within and outside the country. This issue has not yet garnered enough critical attention in the field of literature, especially poetry. The purpose of this research is to analyse selected poems from Epiphanie Mukasano's collection Kilimanjaro on My Lap (2010) that discuss the hardships of African immigrants in South Africa. For the purposes of this study, this research uses migration theory. The research finds that racism and xenophobia are to blame for the country's immigration issues in the poems selected for the study. Asserting that the majority of immigrants are seeking protection due to upheaval in their home countries, Mukasano implores those who commit abhorrent acts of xenophobia and racism to have mercy on the immigrants. Consequently, Mukasano's answers to xenophobic assaults in the selected poems are addressed in this study. Mukasano makes an attempt to persuade the perpetrators of racism and xenophobia in South Africa that Pan-Africanism ought to be seen as a brotherhood rather than an enemy. Poems by Mukasano generally focus on the critical observation of people and their attitudes towards immigrants in general, regardless of their status, as well as the challenging consequences faced by black people. Protest poetry by Mukasano is vocal and engaged in challenging the status quo. Her tone, style, and use of poetic forms, which show how she gets her message across, show that she accomplished this successfully.

Health labor force exodus: A systematic review of drivers influencing nurses’ migration intentions from source countries

The global shortage of nurses has resulted in the demand for their services across different jurisdictions causing migration from developing to developed regions. This study aimed to review the literature on drivers of nurses’ migration intentions from source countries and offer future research directions. A search strategy was applied to ScienceDirect, Web of Science, and Scopus academic databases to find literature. The search was limited to peer-reviewed, empirical studies published in English from 2013–2023 resulting in 841 papers. The study followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines to conduct a systematic review of 35 studies after thorough inclusion and exclusion criteria. In addition, the VOSviewer software was utilized to map network visualization of keywords, geographic and author cooperation for bibliometric understanding. The findings revealed various socio-economic, organizational, and national factors driving nurses’ migration intentions. However, limited studies have been conducted on family income, organizational culture, leadership style, infrastructure development, social benefits, emergency service delivery, specialized training, and bilateral agreements as potential drivers for informing nurses’ migration intentions. Moreover, a few studies were examined from a theoretical perspective, mainly the push and pull theory of migration. This paper contributes to the health human resources literature and shows the need for future studies to consider the gaps identified in the management and policy direction of nurse labor migration.

Effect of Zr4+ on the microstructure and electrical properties of 0.6Y2O3-0.4YCr0.5Mn0.5O3 NTC ceramics

In this study, 0.6Y2O3-0.4YCr0.5Mn0.5O3 negative temperature coefficient (NTC) ceramics doped with different ZrO2 contents were prepared using a two-step sintering method. The effects of Zr4+ content on the microstructure and electrical properties of 0.6Y2O3-0.4YCr0.5Mn0.5O3 were mainly investigated. For the microstructure, X-ray diffraction (XRD) reveals the presence of two main crystalline phases in the samples: Y2O3 and YCr0.5Mn0.5O3. Scanning electron microscopy (SEM) reveals a clear two-phase appearance, and the porosity tends to decrease with the addition of ZrO2. Combined with energy dispersive spectrometer (EDS) to derive the distribution of the elements, Zr4+ is mainly present in the Y2O3 phase, with a small amount in the YCr0.5Mn0.5O3 phase. In addition, the grain sizes of different groups were counted, and the grain size of Y2O3 decreased from 2.73 ± 1.80 μm to 1.65 ± 0.93 μm with the increase of ZrO2 content. For the electrical properties, the resistance-temperature curves were measured from 298.15 K to 1073.15 K, and all the samples exhibited NTC characteristics. And with the increase of ZrO2 content, the resistivity increased from 1.91 × 107 Ω cm to 1.96 × 108 Ω cm, and the B25/100 value decreased from 3315 K to 1310 K. In addition, the chemical state forms of the elements on the surface of the samples were analysed by X-ray photoelectron spectroscopy (XPS), and the valence states as well as the occupancy of the transition elements Cr and Mn were analysed in detail according to the principle of multiple splitting. Finally, the mechanism of influence on microstructure and electrical properties is explained by combining the theory of grain boundary migration and thermal ceramic conductivity.

Migratory behaviour of Ipswich Sparrows during spring

Optimal migration theory predicts birds will follow migration strategies that minimize time, energy, or predation risk, and these strategies employ specific and conflicting behaviours. Many behaviours driving songbird strategies are relatively well known, however gaps remain, especially for spring migration. Here, we describe the behaviours of a short-distance migrant, the Ipswich Sparrow ( Passerculus sandwichensis princeps Maynard, 1872), during spring migration. We determined the start and end dates of migration, migratory duration, travel speed, distance per night, and stopover location and duration. We also examined whether behaviours differed by sex and age. Sparrows migrated between March and June, and took an average of 29.1 days at a speed of 7.2 ± 9.4 m/s (SD) to fly ∼1574 km to their breeding grounds. Sparrows flew approximately 100 km/night and made stopovers of >7 days adjacent to ecological barriers. Males migrated before females, and behaviour did not differ with age. Overall, Ipswich Sparrows had a relatively slow travel speed and covered short distances each night consistent with efforts to minimize energy costs or predation risk. They had prolonged stopovers suggesting that they were also trying to minimize time. More work is required to determine which strategy sparrows may be using during spring migration.

Improvement of thermal damage resistance of SrAl2O4:Eu2+, Dy3+ persistent phosphor by a low temperature pre-annealing and its mechanism

SrAl2O4:Eu2+, Dy3+ as an excellent persistent phosphor has been widely applied in many fields. However, the high temperature induced thermal failure has always been a bottleneck problem restricting its long-term development. In this study, a simple pre-annealing method was utilized to improve the thermal damage resistance ability of SrAl2O4:Eu2+, Dy3+ persistent phosphors. After annealing at 900 °C, the afterglow duration time of the phosphor pre-annealed at 400 °C reached 233 min, which was twice longer than that of the phosphor without pre-annealing. An extrinsic vacancy defect migration theory at an elevated temperature was proposed to explain the interesting phenomenon. This study introduced a path to enhance the thermal stability of SrAl2O4:Eu2+, Dy3+ persistent phosphors and provided a thought to design persistent luminescence materials with desired thermal stability.

Bringing Children to the Center of Migration Theory

Migration theory is adult-centric, failing to account for the experiences of children despite their increasingly important participation in migration flows. Using a life-course perspective and findings from research at the intersection of childhood studies and migration, this paper considers whether different migration theories apply to child migration as compared to adult migration. We examine this question using the Mexican Migration Project data to track the cross-border moves of 109,096 individuals relative to their family members. We find that theories from economics best explain migration among young adults, with some participation from older adolescents, while children of all ages are sensitive to educational opportunities and the behavior of their peers and role models. Insights from the cultural turn and feminist theorizing in migration studies explain migration for both groups. We find that adult and child migration is strongly conditioned on migrant networks and family dynamics, including ties to family members in destination and family structure and caretaking arrangements in origin. We argue that child-centered analyses advance migration theory by highlighting the role of age, the life-course, and intergenerational family dynamics as determinants of international migration.

Why Do People Migrate? Fresh Takes on the Foundational Question of Migration Studies

“Why do people migrate?” is a question that forms the pivot of migration studies, and migration theory in particular. But it has hardly found satisfactory answers. In this article, I reapproach the question from an array of diverse angles and provide eight responses. Some are aligned with recent theoretical developments, others unpack long-standing ideas with evolving significance, and still others are fundamentally atheoretical. Together, they show how the question can be answered, how it is being answered—even inadvertently or misleadingly—and what the implications are of answering the question in different ways. These are the responses, which each initiates a discussion: (1) For the reasons under which they are admitted as immigrants; (2) For reasons that are socially legitimate; (3) Because the sum of push and pull factors is in favor of migration; (4) Because they have the aspiration and the ability to do so; (5) Because an opportunity presents itself; (6) Either because they chose to or because they are forced to; (7) Because they see migration as either intrinsically or instrumentally valuable; (8) To lead a normal life. The discussions demonstrate how theoretical, methodological and political dimensions of migration sway the ways in which reasons for migration are understood and represented. “Why do people migrate?” is slippery as a research question, but its indeterminate nature makes it a guiding light for research that navigates a diversity of perspectives with humility and curiosity.

Overlap and Interrelations Between (Im)mobility Motivations

Scholarship in Migration Studies and Forced Migration and Refugee Studies recognizes that migration and immobility can be the result of various, mixed motivations. Empirical work and conceptualizations of forced and “lifestyle” migration consider some of this complexity. Scholarship on immobility has also examined various, mixed motives. Finally, migration theory development has recently begun to incorporate various “non-economic” motivations, mainly into frameworks originally aimed at tackling economic/labor migrations, mainly integrating force and/or environmental factors. However, efforts to conceptualize and theorize on how and why motivations overlap or are interrelated (positively or negatively) are more scant, less explicit, and less systematic. In this paper, I provide a broad systematic taxonomy of migration and immobility motivation overlap and interrelation. First, I describe the six main (im)mobility motivations discussed in the literature—namely economic, labor-related, safety-related, environmental, family-related, and related to self-fulfillment—organizing them around the degree to which they are driven by extrinsic and/or intrinsic rewards and costs. Second, I provide a general typology of possible ways in (im)mobility motivations become “alternative” to and/or concurrent with each other, and how these instances operate at individual and/or population levels. Third, I examine how the different motivations fit within three important theories of micro-level decision-making in the literature, exploring different points of overlap and interrelation between mechanisms within and across analytical perspectives. I conclude discussing the potential implications of this motivation integration.

Mapping the Future of Migration and Climate Change Science

The scholarship on migration and climate change has been rapidly developed over recent decades, moving away from apocalyptic predictions of mass displacement toward more nuanced modeling of the complex relationships between climate change and migration. Unfortunately, much of that development has happened in parallel to the core of migration studies and thus our prevailing migration theories do not reflect these emerging studies of climate and migration. Our objectives for this article are to describe the general theoretical assertions made in the climate change-migration literature and propose a theoretical framework for guiding empirical investigations into the ways that climate change drives human migration, identifying the mediating variables that more directly shape migration and integrating multiple levels of analyses. We provide an example of how our theoretical framework can be used to design an analytic strategy and conclude by suggesting how future research can use this conceptual model to move toward a cohesive theory of climate-related migration and resulting policy responses.

Migration theory as social theory: From transnational migration to mobile social ontologies

Migration theory <i>as</i> social theory: From transnational migration to mobile social ontologies

Human Rights in the Context of Global Migration

Purpose: The general objective of the study was to explore human rights in the context of global migration. Methodology: The study adopted a desktop research methodology. Desk research refers to secondary data or that which can be collected without fieldwork. Desk research is basically involved in collecting data from existing resources hence it is often considered a low cost technique as compared to field research, as the main cost is involved in executive’s time, telephone charges and directories. Thus, the study relied on already published studies, reports and statistics. This secondary data was easily accessed through the online journals and library. Findings: The findings reveal that there exists a contextual and methodological gap relating to human rights in the context of global migration. Preliminary empirical review revealed that global migration is deeply intertwined with significant human rights issues that vary across different regions and migrant populations. Migrants, regardless of their reasons for moving or legal status, frequently faced exploitation, discrimination, inadequate access to essential services, and social exclusion. The study emphasized that these human rights violations were often systemic and influenced by broader socio-political and economic structures. It highlighted the pervasive nature of rights violations at multiple stages of the migration process and pointed out substantial gaps in the implementation and enforcement of international frameworks designed to protect migrants. Specific groups, such as women, children, and undocumented migrants, were identified as particularly vulnerable, necessitating tailored interventions. The study argued that protecting migrants' human rights was both a moral and pragmatic necessity for fostering inclusive societies and called for a renewed commitment from all stakeholders to work collaboratively towards this goal. Unique Contribution to Theory, Practice and Policy: The Human Rights Theory, Push- Pull Theory of Migration and Social Capital Theory may be used to anchor future studies on global migration. The study recommended further development of migration and human rights theories to account for the complexities of contemporary migration flows, suggesting interdisciplinary approaches to enhance theoretical frameworks. Practically, it underscored the need for targeted support services for vulnerable migrant groups, the creation of safe migration pathways, and the establishment of specialized services addressing their unique needs. Policy recommendations included the adoption of comprehensive national and international policies that uphold the rights of all migrants, the enforcement of anti-discrimination laws, and the establishment of independent monitoring bodies. The study advocated for enhanced international cooperation to address migration challenges and suggested investing in data collection and research for informed policy-making. It also recommended promoting public awareness and education campaigns to foster inclusive attitudes towards migrants and counteract negative stereotypes, aiming to create a more just and humane global migration system.

TOI-1173 A b: The First Inflated Super-Neptune in a Wide Binary System

Among Neptunian mass exoplanets (20−50 M ⊕), puffy hot Neptunes are extremely rare, and their unique combination of low mass and extended radii implies very low density (ρ < 0.3 g cm−3). Over the last decade, only a few puffy planets have been detected and precisely characterized with both transit and radial velocity observations, most notably including WASP-107 b, TOI-1420 b, and WASP-193 b. In this paper, we report the discovery of TOI-1173 A b, a low-density ( ρ=0.195−0.017+0.018 g cm−3) super-Neptune with P = 7.06 days in a nearly circular orbit around the primary G-dwarf star in the wide binary system TOI-1173 A/B. Using radial velocity observations with the MAROON-X and HIRES spectrographs and transit photometry from TESS, we determine a planet mass of M p = 27.4 ± 1.7 M ⊕ and radius of R p = 9.19 ± 0.18 R ⊕. TOI-1173 A b is the first puffy super-Neptune planet detected in a wide binary system (projected separation ∼11,400 au). We explore several mechanisms to understand the puffy nature of TOI-1173 A b and show that tidal heating is the most promising explanation. Furthermore, we demonstrate that TOI-1173 A b likely has maintained its orbital stability over time and may have undergone von-Zeipel–Lidov–Kozai migration followed by tidal circularization, given its present-day architecture, with important implications for planet migration theory and induced engulfment into the host star. Further investigation of the atmosphere of TOI-1173 A b will shed light on the origin of close-in low-density Neptunian planets in field and binary systems, while spin–orbit analyses may elucidate the dynamical evolution of the system.

Driving Factors Affecting the Migration of Young Nursing Care Professionals from Pokhara in a Globalized World: A Hospital Ethnography

Due to unfulfilled expectations in local health-care industry, the participating nurses working in private hospitals in Pokhara were willing to migrate abroad where their aspirations could be met. The irritation, worry, and unhappiness with their career were revealed by the focused-group discussion, in-depth interview, and kuragraphy methods utilized in this study among young nurses in Pokhara. Some of the nurses had already registered for overseas studies and jobs while still working in hospitals and awaiting their visas. As globalization has stimulated the movement of people, the concept of globalization in association with neo-classical and new economic theory of migration, transnationalism, neoliberalism and world-systems from an anthropological standpoint has been applied to analyze the reasons of participant nurses to migrate where the study found that the main reasons for them to migrate were low pay, an uncertain future, a lack of career opportunities, job pressure, and the trend of out-migration. These competent nurses desired to work in core nations have considered semi-periphery as a secondary option. Through the stories of young nurses, this study exposes the dire condition in Nepal’s health-care industry which is motivating nurses to relocate in destination countries resulting brain-drain.

Research on the spatiotemporal distribution and factors influencing intangible cultural heritage in Fujian Province from a multiscale perspective

The spatiotemporal distribution of intangible cultural heritage in Fujian Province, China, and the factors that influence it were explored using multiple spatial scales. The samples include five batches of Chinese national-level and six batches of Chinese provincial-level intangible cultural heritage items, totaling 554. The samples involve city-scale, county-scale, and traditional dwellings, and the analysis uses various methods, such as gravity migration theory and the GeoDetector model. The results show that, in terms of historical timescales, the moving trajectory of the center of gravity of the intangible cultural heritage distribution in Fujian Province involves reciprocation from north to south, and the center moves south in time from the pre-Qin period to the modern period. Spatially, intangible cultural heritage in Fujian Province forms an overall aggregate pattern, among which traditional skills fall into an aggregate pattern; five categories, including traditional drama, fall into an aggregate-random pattern; and four categories, including traditional medicine, fall into a random pattern. The traditional art category and other intensive distribution areas are located in coastal areas, and the traditional dance category is scattered in northwestern Fujian Province. Experiments on the factors influencing intangible cultural heritage distribution were conducted at the city and county levels. At the city level, human geography factors, such as the resident population, urbanization rate, and gross domestic product, have a greater influence on distribution. At the county level, the influence of physical geographical factors clearly increases. The dominant factors for coastal cities are the normalized difference vegetation index (NDVI), average precipitation, and coastline, and that for inland cities is elevation. From the perspective of categories, the dominant factors of traditional music and Quyi are human geography factors, and those of other types of intangible cultural heritage are the synergistic effects of physical geography and human geography. The conclusions of this study are helpful for systematically protecting and developing the intangible cultural heritage industry and improving research theories and methodological systems of the spatiotemporal distribution and mechanism influencing intangible cultural heritage.

Unequal Inaccessibility in Health Services Reason for Rural Migration: An Application of Lee's Push Pull Theory

Rural-to-urban migration has been a growing phenomenon in recent years in Nepal. Federal Democratic Republic Nepal is combating the unequal distribution of resources, power and opportunities induced by a unitary and centralized government in the past. The aim of restructuring the state was to eliminate the uneven distribution of services, power and resources distribution in terms of region. Now, Nepal is implementing three levels of governments- federal, provincial, and local government to eliminate existing inequalities and to make powerful local areas. In this sense, rural-urban migration is not a growing phenomenon but is now a reverse situation. Local governments are developing in the local areas, the local people are migrating to cities. So, the objective of this paper is to apply the push-pull theory of migration and interlink Lee's theory and the distribution of health services in rural areas including Diprung Chuichumma Rural Municipality, Khotang. It is based on the positivistic philosophy and its approach is deductive approach. The causes of rural-to-urban migration are both push-pull factors. Unequal inaccessibility in health services between rural and urban areas is the main reason for migration.

Determination of the Best Feature Subset for Learner Migration in Limpopo

The South African Education Management Information Systems (EMIS) hosts longitudinal data on school inventory, learners, and educators. One of the most prevailing and yet ignored phases in machine learning is Feature Selection (FS). Neglecting this phase can adversely impact the outcome of the machine-learning exercise. This study seeks to explore informative features from the EMIS system which can predict the possibility of learners prematurely transitioning to alternative learning spaces in the Limpopo education system. The Ravenstein migration theory was used to assemble the initial features which were then subjected to Boruta, RPART, Adaboost.M1, and J48 algorithms. The feature subsets generated by the FS algorithms were compared with filter-based statistical methods such as Spearman Correlation and Mutual Information to aid in the final selection of the best feature subset for the study. All machine learning FS methods performed well. Feature subset generated by Boruta was considered optimal due to relatively low importance score variance among the selected features compared to RPART, J48, and Adaboost.M1. It is believed that the low variance in the feature set will improve the model's stability and its ability to generalize with previously unseen data.

Drivers and Impacts of Internal Displacement to Kano City, Nigeria: An Empirical Study and Strategic Recommendations

The increasing rate of internal displacement in Nigeria has raised significant concerns regarding its impact on urban management. Forced migration is often seen as an outcome of unpalatable experience in migrants’ communities. This study aims to identify the factors driving mass internal migration to Kano and to explore the relationship between forced migration and the evolving socio-economic conditions in the city. The research employs a mixed-methods approach, including surveys with 1,000 respondents, interviews with 30 individuals, and six focus group discussions (FGDs). Discussion is anchored on Lee’s push-pull theory of migration. The analysis reveals that insurgency, banditry, communal conflicts over socio-economic space, and herders-farmers conflicts are major factors contributing to unprecedented internal displacement, with Kano emerging as a significant recipient of these migrants. Socio-economic life of Kano slums has been altered and migrants are exposed to various risks, including unemployment, hunger, disease, drug abuse and poor upbringing of the young ones. Uncertain future and danger looms ahead if proactive measures are not taken to address conflicts and insecurity in the northern Nigeria. The government should develop strategies to resolve these crises and facilitate the return of forced migrants to their communities, thereby mitigating the socio-economic disruptions in Kano.

Seasonal patterns and processes of migration in a long-distance migratory bird: energy or time minimization?

Optimal migration theory prescribes adaptive strategies of energy, time or mortality minimization. To test alternative hypotheses of energy- and time-minimization migration we used multisensory data loggers that record time-resolved flight activity and light for positioning by geolocation in a long-distance migratory shorebird, the little ringed plover, Charadrius dubius. We could reject the hypothesis of energy minimization based on a relationship between stopover duration and subsequent flight time as predicted for a time minimizer. We found seasonally diverging slopes between stopover and flight durations in relation to the progress (time) of migration, which follows a time-minimizing policy if resource gradients along the migration route increase in autumn and decrease in spring. Total flight duration did not differ significantly between autumn and spring migration, although spring migration was 6% shorter. Overall duration of autumn migration was longer than that in spring, mainly owing to a mid-migration stop in most birds, when they likely initiated moult. Overall migration speed was significantly different between autumn and spring. Migratory flights often occurred as runs of two to seven nocturnal flights on adjacent days, which may be countering a time-minimization strategy. Other factors may influence a preference for nocturnal migration, such as avoiding flight in turbulent conditions, heat stress and diurnal predators.