Subcritical Research Articles

Promotion of market-based sanitation in Ethiopia: a case study from Wolaita zone.

Ethiopia increased the availability of latrines notably, but the sanitation facilities rarely meet hygienic standards. Therefore, the market-based sanitation (MBS) programme has been implemented across the country for nearly a decade to expand the market and boost the demand for hygienic sanitation products and services. While it does not seem that the MBS would bring any notable change in sanitation conditions so far, its implementation challenges are not adequately understood. To address this gap, this article delves into the grassroots-level implementation of MBS in the Wolaita zone. The study relies on qualitative data gathered through interviews with various stakeholders, examining both demand- and supply-side challenges. Some issues identified were external to MBS implementation, such as high inflation and an unstable political and security situation in Ethiopia. Additionally, the study reveals that more general deficiencies of the Ethiopian health extension program, including the stress and discouragement of local change agents (health extension workers, health development army members) due to workloads and low remuneration, have adversely impacted MBS delivery. The implementation of MBS has also not effectively addressed the affordability of hygienic sanitation products. On the supply side, economic constraints and organizational inefficiencies have hindered the development of the sanitation market, preventing it from reaching a critical mass. Our research suggests that MBS alone will not suffice to improve sanitation in Ethiopia.

Workforce Engagement for Compassionate Advocacy, Resilience, and Empowerment (WE CARE): An Evidence-Based Wellness Program.

Poor well-being and burnout among the nursing workforce were heightened by the COVID-19 pandemic. The purpose of this study was to deliver, spread, and sustain an evidence-based wellness program, Workforce Engagement for Compassionate Advocacy, Resilience, and Empowerment (WE CARE), for nurse leaders, staff registered nurses (RNs), and patient care technicians (PCTs) to ameliorate or prevent burnout, promote resilience, and improve the work environment. The program included Community Resiliency Model (CRM) training provided by a certified 6-member wellness team. A baseline and 6-month follow-up survey included measures of well-being, moral distress, burnout, resilience, perceived organizational support (POS), job satisfaction, intent to leave (ITL), and work environment. A total of 4900 inpatient RNs, PCTs, and leaders of a 1207-bed academic medical center in the southeastern United States were analyzed. From baseline (n = 1533) to 6-month follow-up (n = 1457), well-being, moral distress, burnout, job satisfaction, and work environment improved; however, resilience, POS, and ITL did not. Although we have seen some improvements in well-being and mental health indicators, it is still early in the intervention period to have reached a critical mass with the training and other interventions. The mental health and work environment issues among nurses are so complex, no one-size-fits-all intervention can resolve.

The radius variations of accreting main-sequence stars and mass transfer instability

ABSTRACT Many previous works studied the dynamical time-scale mass transfer stability criteria based on the donor response with neglecting the stellar structure of the accretor. In this letter, we investigate the radial response of accretors with mass accumulation and its effect on the binary mass transfer stability. We perform a series of detailed stellar evolution simulations with different types of accretors and obtain the radial variations of stars accreting at different rates. Since the time within which the donor loses half of the original mass has a correlation with the donor mass, we approximately obtain the mean mass transfer rate as a function of mass ratio. Assuming that the common envelope (CE) phase occurs if the accretor radius exceeds the outer Roche lobe radius, we obtain the critical mass ratio of dynamically unstable mass transfer. We find the critical mass ratios for donors filling their Roche lobes at the Main Sequence (MS) and Hertzsprung Gap (HG) stages are smaller than that derived from the radial response of the donor in the traditional way. Our results may suggest that the binary is easier to enter into the CE phase for a donor star at the MS or HG stage than previously believed.

Why women on corporate boards are more than just tokens: an Indian perspective

PurposeSituated in the context of India, where women’s representation on corporate boards remains low, this study aims to explore whether and how tokenism impacts the behaviours of female directors.Design/methodology/approachThe boardroom experiences and perceptions of 14 women directors are explored through semi-structured interviews and analysed using an inductive and interpretive process. Also, to get a counter perspective and avoid the social desirability bias from the women participants’ responses, 16 men directors are interviewed.FindingsThe study finds that, as gender minorities, women directors' visibility on boards can create performance pressures on these women. To counter gender-based prejudices, women directors consciously alter their behaviours and project both male and female traits consistent with the director role. By doing so, women directors overcome tokenistic stereotypes and are accepted as part of the director in-group, irrespective of their numeric representation on the board.Practical implicationsThe research has implications for governments attempting to increase women’s board presence through affirmative actions and for firms aiming to improve the gender diversity of their board composition.Originality/valueThese findings present an alternative perspective on women directors’ board behaviour by exploring the applicability of Western trends on tokenism and critical mass in the context of India, adding to the vast body of literature concerned with minorities on corporate boards.

Women Directors: An Empirical Test of Critical Mass Hypothesis

This paper offers integrated theoretical-based empirical evidence regarding the role of female directors in promoting corporate common good using resource dependency model built on critical mass hypothesis. Using panel regression involving 220 firm-year observations from 2011 to 2021, the paper empirically assesses the moderating impacts of diversity and social inclusion policy, and gender-based power separation in determining the direction of causality between composition of female directors and foreign capital importation by the top 20 commercial banks in Nigeria. With approximately 30 per cent female director representation in the sampled banks (i.e., optimal gender threshold), the paper offers support to critical mass hypothesis and validates intrinsic benefits of women in corporate boardroom. The empirical result shows that female director representation in boards with strong diversity and social inclusion policy and greater independent non-executive directors, is positively linked to resource dependency role of foreign capital importation. Diversity of power separation is found to be detrimental to such board tasks due to overwhelming tokenism effect that surrounds gender-based power delineation. These key findings are statistically significant and robust to a series of iterated sensitivity tests. In addition to offering emerging market contributions to the growing literature on critical mass theory application, findings from this study demonstrate the inherent value of combining multiple governance theories (such as resource dependency and critical mass models) and the dynamic research framework opportunities it offers for robust empirical testing.

Corporate Governance and Ownership Structure Effect on Corporate Social Performance: Evidence from Non-Financial Industries of Pakistan

This paper will examine the diversified associations between corporate governance and ownership structure impact on corporate social performance in dissimilar industries across Pakistan non-financial. The OLS models regression are estimation to using data from 2011 to 2020, that the non-financial industries of Pakistan. Corporate governance including board independence (BINDP), board size (BSIZE), and audit size and committee (A&COM), and structure ownership including, ownership managerial (MOWN), ownership family (FOWN), and ownership concentration (COWN), inspires of organizations corporate social performance with environmental and social risk market capitalization. Generally, the outcomes significant of ownership structure and corporate governance is recognized in industries of non-financial different at a joint level while examines the organizations with a risk whole risk market capitalization disclosure. That suggest to identifying the ownership structure and corporate governance can risk mitigate the market capitalization disclosure non-financial industries in term of correlation the corporate social performance improving and the developed the benefits with the calculation of identical female director in women on board and family ownership organizations (independent or executive) to the panel. This study also demand consideration to the corporate governance and improve structure ownership to enhance the corporate social responsibility in industries non-financial with market risk capitalization analysis, whereas risk control performance of industries analysis after complement by critical mass and independent directors properties.

Does a co‐opted director affect a firm's financial distress risk?

AbstractThis study examines the relationship between co‐opted directors (CODIR), measured as the fraction of directors appointed after the Chief Executive Officer (CEO) assumes office to board size, and firms' financial distress risk (FFDR). Understanding the relationship between CODIR and FFDR is imperative due to the significant impact of high risk‐taking on financial crises and the heightened expectations placed on board members for risk oversight. Despite growing research on corporate governance and FFDR, little attention has been paid to the role of CODIRs, presenting a significant gap in the literature. Using a US sample from 1996 to 2019, covering 13,486 firm‐year observations, we document that CODIR reduces FFDR, supporting the hypothesis that co‐opted directors have a lower financial distress risk‐taking propensity than their non‐co‐opted counterparts. We also find that a critical mass of at least three CODIRs and independent CODIRs reduces FFDR. Our results also document that CEO power in the form of CEO duality and CEO tenure, external monitoring in the form of the number of analysts following the firm, competition, and takeover susceptibility do not drive our main conclusions for co‐option and FFDR. Finally, the results show that CODIR reduces FFDR through liquidity channels. The findings remain robust to various definitions of co‐option and distress risk, and are consistent in both difference‐in‐differences analysis and propensity score matching.

Extrinsic and intrinsic drivers of natural killer cell clonality.

Clonal expansion of antigen-specific lymphocytes is the fundamental mechanism enabling potent adaptive immune responses and the generation of immune memory. Accompanied by pronounced epigenetic remodeling, the massive proliferation of individual cells generates a critical mass of effectors for the control of acute infections, as well as a pool of memory cells protecting against future pathogen encounters. Classically associated with the adaptive immune system, recent work has demonstrated that innate immune memory to human cytomegalovirus (CMV) infection is stably maintained as large clonal expansions of natural killer (NK) cells, raising questions on the mechanisms for clonal selection and expansion in the absence of re-arranged antigen receptors. Here, we discuss clonal NK cell memory in the context of the mechanisms underlying clonal competition of adaptive lymphocytes and propose alternative selection mechanisms that might decide on the clonal success of their innate counterparts. We propose that the integration of external cues with cell-intrinsic sources of heterogeneity, such as variegated receptor expression, transcriptional states, and somatic variants, compose a bottleneck for clonal selection, contributing to the large size of memory NK cell clones.

CFD modelling of flashing flows for nuclear safety analysis: possibilities and challenges

Abstract Because of its relevance for the safety analysis of pressurized water reactors (PWR), many research activities on flashing flows in pipes and nozzles arose from the mid of last century. Most of them have been focused on the critical mass flow rate and transient pressure or temperature fluctuations by means of experiments and system codes. Since the beginning of this century, owing to the increase in computer speed and capacity, computational fluid dynamics (CFD) is being used more and more in the investigation of flashing flows, which has the advantage of providing three-dimensional insights in the internal flow structure as well as its evolution. This work presents an overview of relevant flashing scenarios in the nuclear safety analysis, and focuses on the discussion about possibilities and challenges of using CFD modelling. It is shown that a two-fluid model with the thermal phase-change model is superior to a mixture model with pressure phase-change, relaxation and equilibrium models, respectively, in terms of interfacial mass transfer, however, efforts are still required to improve the interphase heat-transfer model. Furthermore, since flashing is accompanied with high void fraction and broad bubble size ranges, a poly-disperse two-fluid model is recommended, but the effect of phase change on bubble coalescence and breakup needs further research. In addition, during flashing the flow pattern may change from single phase to bubbly flow, churn flow, annular flow, and even mist flow. The rapid change of interfacial topology as well as its influence on the applicability of closure models remains a challenge.

Stimulated decay of collapsing axion stars and fast radio bursts

The radiation mechanism of fast radio bursts (FRBs) has been extensively studied but still remains elusive. In the search for dark matter candidates, the QCD axion and axionlike particles (ALPs) have emerged as prominent possibilities. These elusive particles can aggregate into dense structures called axion stars through Bose–Einstein condensation (BEC). Such axion stars could constitute a significant portion of the mysterious dark matter in the universe. When these axion stars grow beyond a critical mass, usually through processes like accretion or merging, they undergo a self-driven collapse. Traditionally, for spherically symmetric axion clumps, the interaction between axions and photons does not lead to parametric resonance, especially when the QCD axion-photon coupling is at standard levels. Nevertheless, our study indicates that even QCD axion stars with typical coupling values can trigger stimulated decay during their collapse, rather than producing relativistic axions through self-interactions. This process results in short radio bursts, with durations of around 0.1 s, and can be potentially observed using radio telescopes like FAST or SKA. Furthermore, we find that collapsing axion stars for ALPs with specific parameters may emit radio bursts lasting just milliseconds with a peak luminosity of 1.60×1042erg/s\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$1.60\ imes 10^{42}\\,\\mathrm{erg/s}$$\\end{document}, matching the characteristics of the observed non-repeating FRBs.

Understanding the role of head size and neck length in micromotion generation at the taper junction in total hip arthroplasty

Modular hip implants allow intra-operative adjustments for patient-specific customization and targeted replacement of damaged elements without full implant extraction. However, challenges arise from relative micromotions between components, potentially leading to implant failure due to cytotoxic metal debris. In this study magnitude and directions of micromotions at the taper junction were estimated, aiming to understand the effect of variations in head size and neck length. Starting from a reference configuration adhering to the 12/14 taper standard, six additional implant configurations were generated by varying the head size and/or neck length. A musculoskeletal multibody model of a prothesized lower limb was developed to estimate hip contact force and location during a normal walking task. Following the implant assembly, the multibody-derived loads were imposed as boundary conditions in a finite element analysis to compute the taper junction micromotions as the relative slip between the contacting surfaces. Results highlighted the L-size head as the most critical configuration, indicating a 2.81 μm relative slip at the mid-stance phase. The proposed approach enables the investigation of geometric variations in implants under accurate load conditions, providing valuable insights for designing less risky prostheses and informing clinical decision-making processes.

Critical mass phenomenon for a parabolic–elliptic multispecies chemotaxis system in a two‐dimensional disk

A parabolic–elliptic Keller–Segel model for multipopulations in a two‐dimensional unit ball will be considered in this paper. For the initial boundary value problem with mutually attractive populations, the global existence of bounded solutions has been proved through the logarithmic Hardy–Littlewood–Sobolev inequality for system when the initial masses satisfy the subcritical condition. Moreover, based on the moments technique, there exists a blow‐up solution when the initial masses satisfy the supercritical case. In a word, a critical mass phenomenon has been established in this multispecies chemotaxis system.

Pulsed Field Ablation and Neurocardiology: Inert to Efferents or Delayed Destruction?

The therapeutic use of irreversible electroporation in clinical cardiac laboratories, termed pulsed field ablation (PFA), is gaining pre-regulatory approval momentum among rhythm specialists for the mitigation of arrhythmogenic substrate without increased procedural risk. Though electroporation has been utilized in other branches of science and medicine for decades, apprehension regarding all the possible off-target complications of PFA have yet to be thoroughly identified and investigated. This brief review will summarize the preclinical and adult clinical data published to date on PFA's effects on the autonomic system that interplays closely with the cardiovascular system, termed the neurocardiovascular system. These data are contrasted with the findings of efferent destruction secondary to thermal cardiac ablation modalities, namely radiofrequency energy and liquid nitrogen-based cryoablation. In vitro neurocardiology findings, in vivo neurocardiology findings, and clinical neurocardiology findings to date nearly unanimously support the preservation of a critical mass of perineural structures and extracellular matrices to allow for long-term nervous regeneration in both cardiac and non-cardiac settings. Limited histopathologic data exist for neurocardiovascular outcomes post-PFA. Neuron damage is not only theoretically possible, but has been observed with irreversible electroporation, however regeneration is almost always concomitantly described.

Same Naira, More Possibilities! Assessing the Legal Status of the eNaira and Its Potential for Privacy and Inclusion

AbstractOn 25 October 2021, Nigeria became the second country in the world, and the first in Africa, to launch a central bank digital currency. Launched with the tag line “Same Naira. More possibilities”, the Central Bank of Nigeria publicized the eNaira as having the capability to deepen financial inclusion, reduce the cost of financial transactions and support a more efficient payment system. However, more than one year after its launch, its usage is yet to gain a critical mass. This article identifies the significant challenges that make the eNaira unacceptable and potentially ineffective. First, its status as legal tender is questionable; secondly, it undermines privacy, a critical component of physical cash. Thirdly, it is incapable of wide acceptance by individuals and entities across Nigeria. The article explains each of these challenges and proposes a roadmap to the eNaira's acceptance and effectiveness.

Do women in the boardroom influence foreign acquisitions' premium and outcomes? Evidence from China

AbstractThis paper examines whether gender diversity influences foreign merger and acquisition (M&A) premiums and outcomes in China. Consistent with agency and resource dependence theories, we find that female directors significantly reduce the acquisition premium paid for foreign targets. We show that the market responds positively in the short‐term (measured by cumulative abnormal returns) to the announcement of foreign acquisitions by firms with greater female representation in the boardroom. We further find significant evidence that acquirers' boards comprising more female directors experience value creation and better operating synergies (measured by buy‐and‐hold abnormal returns and changes in return on assets) in the long‐term following engagement in foreign M&A deals. Interestingly, after distinguishing between female independent and executive directors, we find that our previous finding on board gender diversity can be attributable to both the monitoring (independent directors) and supervisory (executive directors) roles played by female directors. We also find evidence accords with the argument of the critical mass of female directors' representation in the boardroom. Our results are robust after controlling for endogeneity issues using instrumental variables (IV), propensity score matching (PSM), Heckman, and firm fixed‐effects methods. Overall, our findings offer additional empirical support for the global concern by regulators for improving corporate governance practices by increasing female quotas in the boardroom.

Constraining mass transfer models with galactic neutron star–white dwarf binaries as gravitational wave sources

ABSTRACT Neutron star–white dwarf (NSWD) binaries are one of the most abundant sources of gravitational waves (GWs) in the Milky Way. These GW sources are the evolutionary products of primordial binaries that experienced many processes of binary interaction. We employ a binary population synthesis method to investigate the properties of Galactic NSWD binaries detectable by the Laser Interferometer Space Antenna (LISA). In this paper, only the NSWD systems with a COWD or ONeWD component are included. We consider various models related to mass-transfer efficiencies during primordial binary evolution, supernova explosion mechanisms at NS formation, common envelope ejection efficiencies, and critical WD masses that determine the stability of mass transfer between WDs and NSs. Based on our calculations, we estimate that tens to hundreds of LISA NSWD binaries exist in the Milky Way. We find that the detection of LISA NSWD binaries is able to provide profound insights into mass-transfer efficiencies during the evolution of primordial binaries and critical WD masses during mass transfer from a WD to an NS.

Blending access-based services and triadic frameworks: an empirical evaluation of Packaging-as-a-Service

PurposeRecently emerged Packaging-as-a-Service (PaaS) systems adopt aspects of access-based services and triadic frameworks, which have typically been treated as conceptually separate. The purpose of this paper is to investigate the implications of blending the two in what we call “access-based triadic systems,” by empirically evaluating intentions to adopt PaaS systems for takeaway food among restaurants and consumers.Design/methodology/approachWe derived relevant attributes of PaaS systems from a qualitative pre-study with restaurants and consumers. Next, we conducted two factorial survey experiments with restaurants (N = 176) and consumers (N = 245) in Germany to quantitatively test the effects of those system attributes on their adoption intentions.FindingsThis paper highlights that the role of access-based triadic system providers as both the owners of shared assets and the operators of a triadic system is associated with a novel set of challenges and opportunities: System providers need to attract a critical mass of business and end customers while balancing asset protection and system complexity. At the same time, asset ownership introduces opportunities for improved quality control and differentiation from competition.Originality/valueConceptually, this paper extends research on access-based services and triadic frameworks by describing an unexplored hybrid form of non-ownership consumption we call “access-based triadic systems.” Empirically, this paper addresses the need to account for the demands of two distinct target groups in triadic systems and demonstrates how factorial survey experiments can be leveraged in this field.

Does she belong here? Women in leadership positions and organizational performance in gendered institutions

AbstractGender diversity in leadership positions may not always bring desirable outcomes for an organization as diversity researchers have argued. Female leaders are less likely to contribute to effectiveness of their organization when it is male‐dominated and has strong masculine culture. We tested a nonlinear relationship between gender diversity at the top and organizational performance and the moderating effect of a female critical mass in an organization. Time‐series data were collected from state‐owned enterprises and quasi‐governmental organizations affiliated with the Korean government and were analyzed through fixed‐effects panel regressions. The results show that gender diversity on executive boards has an inverted U‐shaped relationship with organizational performance. The positive effect of gender diversity on executive boards on organizational performance increases up to a certain level, beyond which the diversity effect turns negative. Curvilinear relationships were found to be flatter in more gender‐balanced organizational settings, suggesting that the negative effect of gender diversity at the top is likely to increase to a lesser extent than in male‐skewed settings.

Towards reusable building blocks for agent-based modelling and theory development

Despite the increasing use of standards for documenting and testing agent-based models (ABMs) and sharing of open access code, most ABMs are still developed from scratch. This is not only inefficient, but also leads to ad hoc and often inconsistent implementations of the same theories in computational code and delays progress in the exploration of the functioning of complex social-ecological systems (SES). We argue that reusable building blocks (RBBs) known from professional software development can mitigate these issues. An RBB is a submodel that represents a particular mechanism or process that is relevant across many ABMs in an application domain, such as plant competition in vegetation models, or reinforcement learning in a behavioural model. RBBs need to be distinguished from modules, which represent entire subsystems and include more than one mechanism and process. While linking modules faces the same challenges as integrating different models in general, RBBs are “atomic” enough to be more easily re-used in different contexts. We describe and provide examples from different domains for how and why building blocks are used in software development, and the benefits of doing so for the ABM community and to individual modellers. We propose a template to guide the development and publication of RBBs and provide example RBBs that use this template. Most importantly, we propose and initiate a strategy for community-based development, sharing and use of RBBs. Individual modellers can have a much greater impact in their field with an RBB than with a single paper, while the community will benefit from increased coherence, facilitating the development of theory for both the behaviour of agents and the systems they form. We invite peers to upload and share their RBBs via our website - preferably referenced by a DOI (digital object identifier obtained e.g. via Zenodo). After a critical mass of candidate RBBs has accumulated, feedback and discussion can take place and both the template and the scope of the envisioned platform can be improved.

Cultural-linguistic diversity in Italy and Sweden? A sociomaterial analysis of policies for heritage language education

ABSTRACT In this paper, we critically discuss the impact of policy documents on the construction of national narratives on the provision of support for cultural-linguistic diversity in education systems in two European countries. The analysis focuses upon a selection of national policy documents that deal with the planning and provision of HLE since the 1990s. We take critical pedagogy and sociomateriality as theoretical lenses to investigate educational policies on HLE. Thus, this study critically traces the ways in which language ideologies are enmeshed with legislative, political and educational discourses by following an inductive and retroductive process, wherein key-concepts, themes and critical configurations of HLE are mapped, compared, re-assembled and discussed in terms of a complex system. The analysis shows that the (non-)provision of HLE shapes the educational space and the value references and world views that prevail and are (re)produced in it. Emerging deficit perspectives, linguistic assimilation and marginalisation processes limit the path towards more inclusive and equitable educational institutions and practices.