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Black fathers, and specifically fathers who identify as African American, represent a group of parents who are at once not well understood and pervasively stereotyped in negative ways. In this chapter, we describe the risks and resilience of Black fathers and their children, with a special focus on mental health and coping with stress. We emphasize a cultural practices approach that takes into account both the risks specific to Black fathers’ capacity to parent their children and a theoretical foundation for understanding the inherent strengths of Black men and their families. Finally, we address the need for early childhood educators to partner with Black fathers as a means to best support children and their families.

The study of the electro-osmotic forces (EOF) in the flow of the boundary layer has been a topic of interest in biomedical engineering and other engineering fields. The purpose of this paper is to develop an innovative mathematical model for electro-osmotic boundary layer flow. This type of fluid flow requires sophisticated mathematical models and numerical simulations.

The effect of EOF on the boundary layer Williamson fluid model containing a gyrotactic microorganism through a non-Darcian flow (Forchheimer model) is investigated. The problem is formulated mathematically by a system of non-linear partial differential equations (PDEs). By using suitable transformations, the PDEs system is transformed into a system of non-linear ordinary differential equations subjected to the appropriate boundary conditions. Those equations are solved numerically using the finite difference method.

The boundary layer velocity is lower in the case of non-Newtonian fluid when it is compared with that for a Newtonian fluid. The electro-osmotic parameter makes an increase in the velocity of the boundary layer. The boundary layer velocity is lower in the case of non-Darcian fluid when it is compared with Darcian fluid and as the Forchheimer parameter increases the behavior of the velocity becomes more closely. Entropy generation decays speedily far away from the wall and an opposite effect occurs on the Bejan number behavior.

The present outcomes are enriched to give valuable information for the research scientists in the field of biomedical engineering and other engineering fields. Also, the proposed outcomes are hopefully beneficial for the experimental investigation of the electroosmotic forces on flows with non-Newtonian models and containing a gyrotactic microorganism.

This paper aims to present a study on stability analysis of Jeffrey fluids in the presence of emergent chemical gradients within microbial systems of anisotropic porous media.

This study uses an effective method that combines non-dimensionalization, normal mode analysis and linear stability analysis to examine the stability of Jeffrey fluids in the presence of emergent chemical gradients inside microbial systems in anisotropic porous media. The study focuses on determining critical values and understanding how temperature gradients, concentration gradients and chemical reactions influence the onset of bioconvection patterns. Mathematical transformations and analytical approaches are used to investigate the system’s complicated dynamics and the interaction of numerous characteristics that influence stability.

The analysis is performed using the Jeffrey-Darcy type and Boussinesq estimation. The process involves using non-dimensionalization, using the normal mode approach and conducting linear stability analysis to convert the field equations into ordinary differential equations. The conventional thermal Rayleigh Darcy number RDa,c is derived as a comprehensive function of various parameters, and it remains unaffected by the bio convection Lewis number Łe. Indeed, elevating the values of ζ and γ′ in the interval of 0 to 1 has been noted to expedite the formation of bioconvection patterns while concurrently expanding the dimensions of convective cells. The purpose of this investigation is to learn how the temperature gradient affects the concentration gradient and, in turn, the stability and initiation of bioconvection by taking the Soret effect into the equation. The results provide insightful understandings of the intricate dynamics of fluid systems affected by chemical and biological elements, providing possibilities for possible industrial and biological process applications. The findings illustrate that augmenting both microbe concentration and the bioconvection Péclet number results in an unstable system. In this study, the experimental Rayleigh number RDa,c was determined to be 4π2at the critical wave number ( δcˇ) of π.

The study’s novelty originated from its investigation of a novel and complicated system incorporating Jeffrey fluids, emergent chemical gradients and anisotropic porous media, as well as the use of mathematical and analytical approaches to explore the system’s stability and dynamics.

The highly unpredictable, complex, and dynamic business environment forces companies to innovate constantly. One organizational response to coping with environmental pressures is organizational ambidexterity, that is, the ability to pursue simultaneously the exploitation of existing capabilities and the exploration of new opportunities. It has an impact on the way of working, and consequently, organizations need to reevaluate their talent strategies. With this conceptual contribution, we first provide a fresh view on talent and talent management (TM) by suggesting an ambidextrous TM approach, including novel TM practices that have been rather neglected in the so far dominant traditional TM approach. It centers on the system-controlling element of an ambidextrous mindset. Second, in a theory-based framework, we explain how dynamic TM capabilities (hybrid, dual, and ambidextrous TM), which represent processes for deploying, developing, and shaping talent, can contribute to gaining competitive advantages in various ambidextrous structures reflecting the complexity and dynamism of and within human resource (HR) ecosystems. The authors advance the under-researched process perspective on TM by using the lenses of the HR ecosystems discussion, insights from a dynamic view on the person–environment fit, and dynamic capabilities. The authors conclude with a broad agenda for future research in TM in dynamic environments.

This issue is a selected bibliography covering the subject of leadership.

The purposes of this study are to (i) systematically review the state of the existing research of talent management (TM) in emerging markets and its connections with firm performance; (ii) recap the results in an integrative and multidisciplinary framework and (iii) recognize potential research contradictions and gaps that offer avenues for future study.

In this study, the authors apply a systematic literature review (SLR) methodology to review 31 peer-reviewed articles published in highly ranked journals (ABS journals list – ranking 3, 4 and 4*) over more than two decades.

This review shows that the state of the current research of TM in emerging countries and its connections with firm performance is characterized by complexity and fragmentation within the different countries investigated. This review summarizes and highlights five central categories of TM in emerging markets. In order to ensure that the field of research investigated continues to be relevant to diverse constituents, the authors incorporate the various prominent research perspectives into an integrative framework structured at macro (economies/countries), meso (industries) and micro (individuals/organizations) levels.

This research provides guidance for chief executive officers, chief financial officers and human resource directors in emerging countries to develop TM within their organization in order to capture its relevant aspects, from a strategic (purposeful and competency modeling), organizational (talent planning and career track planning) and financial point of view (remuneration policy and firm performance).

The authors offer a first holistic overview of the features of TM in emerging markets and also introduce firm performance. The authors present an integrative multidisciplinary framework that can serve as a starting point of a summary of areas covered by the literature. Finally, the authors identify several knowledge gaps, emerging topics and limitation of current research, through which ideas for future investigations are offered.

Though the coexistence of nonviolent and violent groups within a single movement is a common phenomenon in maximalist campaigns (e.g., regime change, anti-occupation), the effects of this coexistence remain understudied. Focusing on primarily nonviolent movements with a simultaneous “radical flank” pursuing the same goals, this study builds on previous, inconclusive literature which narrowly accounts for limited and often case-specific radical flank effects. After conducting a series of large-N regression analyses using a subset of the NAVCO 2.0 dataset, this study finds that the presence of a radical flank (1) increases both the likelihood and degree of repression by the state and (2) is most significantly linked with decreased mobilization post-repression – yet, (3) is not necessarily detrimental to overall campaign progress.

In recent years, practitioners have identified a number of problems with traditional performance management (PM) systems, arguing that PM is broken and needs to be fixed. In this chapter, we review criticisms of traditional PM practices that have been mentioned by journalists and practitioners and we consider the solutions that they have presented for addressing these concerns. We then consider these problems and solutions within the context of extant scholarly research and identify (a) what organizations should do going forward to improve PM practices (i.e., focus on feedback processes, ensure accountability throughout the PM system, and align the PM system with organizational strategy) and (b) what scholars should focus research attention on (i.e., technology, strategic alignment, and peer-to-peer accountability) in order to reduce the science-practice gap in this domain.

In this paper we build upon previous research that examines how workers in devalued occupations transform structural conditions that threaten their dignity into resources with which to protect themselves. Through in-depth interviews and fieldwork with early childhood educators (ECE), we examine the work experiences of teachers in four distinct work contexts: daycare centers and within elementary schools, each in either the public or private sector. We find that these different school organizational contexts shape what kinds of identity challenges early childhood teachers experience. Different organizational contexts not only subject teachers to different threats to their work-related identity but also have different potential identity resources embedded within them that teachers can use on their own behalf. Thus, while all the early childhood educators in our sample struggle with being employed within a devalued occupation, the identity strategies they have developed to protect their self-worth vary across employment contexts. We show that the strategies these interactive service workers use to solve identity-related problems of dignity at work involve the creative conversion of constraints they face at work into resources that help them achieve valued work identities.

The purpose of this paper is to elaborate on the commonality between the Theory of Didactical Situations (TDS) and lesson study to propose a model of lesson study using both the predominant graphical representation of lesson study by Lewis and the model of the didactical situation at the heart of TDS by Brousseau.

Starting by describing and adapting the predominant graphical representation of lesson study by Lewis and the model of the didactical situation at the heart of TDS by Brousseau, the paper integrates the two representations to highlight the commonalities between the students’ learning situation and the teachers’. Based on this integrated graphical representation, the key phases of lesson study are then conceptualised by the mean of the dialectic between didactical and adidactical situation.

The reflection about the use of the TDS graphical representation embedded in the lesson study diagram helps the reflection on the use of TDS itself to analyse lesson study. This theoretical analysis describes the process of teacher learning in lesson study and the link between their learning and the student’s. It also shows that lesson study is a good candidate for the fundamental situation of the knowledge for teaching.

The graphical conceptualisation of lesson study as a learning situation for teachers offers new insight about how teachers learn in lesson study.