bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dark photon effects with the kinetic and mass mixing in
Z
-boson decay processes
Authors: Sun Jin , Xing Zhi-Peng 
Published: February 2024

Motivated by the most recent measurement of tau polarization in Z→τ+τ− by CMS, we have introduced a new U(1)X gauge boson field X, which can have renormalizable kinetic mixing with the standard model U(1)Y gauge boson field Y. In addition to the kinetic mixing of the dark photon, denoted as σ, there may also be mass mixing introduced by the additional Higgs doublet with a vacuum expectation value participating in U(1)X and electroweak symmetry breaking simultaneously. The interaction of the Z boson with the SM leptons is modified by the introduction of the mixing ratio parameter ε, which quantifies the magnitude of both the mass and kinetic mixing of the dark photon. Initially, we use the tau lepton as an example to explore the Z-boson phenomenology of the dark photon model with both kinetic and mass mixing. The goal is to determine the allowed parameter regions by taking into account constraints from the vector and axial-vector couplings gV,Aτ, the decay branching ratio Br(Z→τ−τ+) and tau-lepton polarization in Z→τ−τ+. We found that the mixing ratio plays important role in the Z-boson features by choosing different ε values. Furthermore, we aim to generalize our analysis from the tau-lepton case to include all fermions by conducting global fits. This allows us to identify viable regions by incorporating relevant fermion constraints and the W/Z mass ratio. Correspondingly, we obtain the fit results with the kinetic mixing parameter σ=0.074±0.021, mixing ratio ε=−1.37±0.46, and dark photon mass mX=275±39  GeV. Our global analysis indicates a preference for a dark photon mass larger than mZ.

Published by the American Physical Society
2024
Footprints of the QCD Crossover on Cosmological Gravitational Waves at Pulsar Timing Arrays
Authors: Franciolini Gabriele , Racco Davide , Rompineve Fabrizio 
Published: February 2024

Pulsar timing arrays (PTAs) have reported evidence for a stochastic gravitational wave (GW) background at nanohertz frequencies, possibly originating in the early Universe. We show that the spectral shape of the low-frequency (causality) tail of GW signals sourced at temperatures around T≳1  GeV is distinctively affected by confinement of strong interactions (QCD), due to the corresponding sharp decrease in the number of relativistic species, and significantly deviates from ∼f3 commonly adopted in the literature. Bayesian analyses in the NANOGrav 15 years and the previous international PTA datasets reveal a significant improvement in the fit with respect to cubic power-law spectra, previously employed for the causality tail. While no conclusion on the nature of the signal can be drawn at the moment, our results show that the inclusion of standard model effects on cosmological GWs can have a decisive impact on model selection.

Published by the American Physical Society
2024
Helicopter airfoil aerodynamic characteristics and rotor trim in sandy environments
Authors: Huang Zejian , Cao Yihua , Wang Yanyang 
Published: February 2024

Purpose
The sandy environment is one of the typical environments in which helicopters operate. Air-sand two-phase flow in sandy environments may be an important factor affecting flight safety. Taking a typical example, this paper aims to investigate the aerodynamic and rotor trim characteristics of the UH-60 helicopter in sandy environments.

Design/methodology/approach
A computational study is conducted to simulate the air-sand flow over airfoils based on the Euler–Lagrange framework. The simulation uses the S-A turbulence model and the two-way momentum coupling methodology. Additionally, the trim characteristics of the UH-60 rotor are calculated based on the isolated rotor trim algorithm.

Findings
The simulation results show that air-sand flow significantly affects the aerodynamic characteristics of the SC1095 airfoil and the SC1094R8 airfoil. The presence of sand particles leads to a decrease in lift and an increase in drag. The calculation results of the UH-60 helicopter rotor indicate that the thrust decreases and the torque increases in the sandy environment. To maintain a steady forward flight in sandy environments, it is necessary to increase the collective pitch and the longitudinal cyclic pitch.

Originality/value
In this paper, the aerodynamic characteristics of airfoils and the trim characteristics in the air-sand flow of the UH-60 helicopter are discussed, which might be a new view to analyse the impact of sandy environments on helicopter safety and manoeuvring.
Impact of self-efficacy on construction labor productivity: the mediating role of work motivation
Authors: Van Tam Nguyen 
Published: February 2024

PurposeThough widely recognized as essential for improving work performance across various domains, self-efficacy’s specific role in managing construction workforces remains understudied. This knowledge gap restricts our ability to uncover new factors that enhance workforce management effectiveness and ultimately boost construction labor productivity (CLP). To address this, our study proposes and tests a novel model. This model explores the impact mechanism of self-efficacy on CLP by investigating the mediating role of work motivation. By delving into this crucial yet underexplored area, we aim to provide valuable insights for construction project managers and researchers alike, paving the way for more effective workforce management strategies and consequently, improved CLP.Design/methodology/approachThis study utilizes a mixed-method approach, incorporating both qualitative and quantitative methodologies. Data from 112 rebar workers at five construction sites in Vietnam underwent analysis using Cronbach’s alpha, exploratory factor analysis (EFA), confirmatory factor analysis (CFA) and structural equation modeling (SEM) to examine the novel research model.FindingsThe results indicate a positive and significant association between self-efficacy and CLP. Additionally, work motivation emerged as a full mediator in the relationship between self-efficacy and CLP. Specifically, individuals with higher self-efficacy set ambitious goals and invest more effort in their pursuit, leading to increased work motivation and, ultimately, heightened productivity levels.Practical implicationsThe significant implications of the current study extend to construction managers and policymakers alike. Construction managers can leverage the findings to devise targeted interventions aimed at enhancing the self-efficacy and work motivation of their workforce, potentially resulting in noteworthy enhancements in CLP. Policymakers, too, can benefit from these findings by formulating policies that actively support the cultivation of self-efficacy and work motivation among construction workers. Such policies have the potential to foster a more productive and efficient construction industry, aligning with the broader goals of workforce development and industry enhancement.Originality/valueThis study expands existing knowledge by identifying the important role of self-efficacy in work performance enhancement and the mediating role of work motivation in terms of these relationships.
Assessing the drivers to share the content on social media in tourism: the empirical evidence on a world heritage city
Authors: García-Haro María Ángeles , Ruiz-Palomino Pablo , Martínez-Cañas Ricardo , Martínez-Ruiz María Pilar 
Published: February 2024

PurposeThis study seeks to provide a greater understanding of the variables that influence travellers’ intention to participate in social media, paying special attention to (1) the direct impact of perceived usefulness (PU) of social media and (2) the moderating impact of tourists’ altruism and self-interest.Design/methodology/approachThe proposed conceptual model was empirically tested using an online questionnaire distributed to a sample of 394 tourists visiting a World Heritage city.FindingsThe findings show that perceived social media usefulness has a significant effect on users’ intention to share experiences. Additionally, self-interest appears to moderate the relationship between perceived social media usefulness and users’ sharing intention, but the results do not support the moderating effect of altruism.Originality/valueDespite scholars’ growing interest in social networks as sources of tourist information, little is known about the aspects that encourage users’ participation in these platforms. This paper offers key contributions to the relevant literature in this field and offers compelling recommendations for tour operators' management of social networks.
Optimal bidding strategy for integrated CHP system by modified heuristic algorithm considering CO2 emission in energy and reserve markets
Authors: Nazari Mohammad Esmaeil , Assari Zahra 
Published: February 2024

Purpose
This study aims to solve optimal pricing and power bidding strategy problem for integrated combined heat and power (CHP) system by using a modified heuristic optimization algorithm.

Design/methodology/approach
In electricity markets, generation companies compete according to their bidding parameters; therefore, optimal pricing and bidding strategy are solved. Recently, CHP units are significantly operated by generation companies to meet power and heat, simultaneously.

Findings
For validation, it is shown that profit is improved by 0.04%–48.02% for single and 0.02%–31.30% for double-sided auctions. As heat price curve is extracted, the simulation results show that when CHP system is integrated with other units results in profit increase and emission decrease by 3.04%–3.18% and 2.23%–4.13%, respectively. Also, CHP units significantly affect bidding parameters.

Originality/value
The novelties are pricing and bidding strategy of integrated CHP system is solved; local heat selling is considered in pricing and bidding strategy problem and heat price curve is extracted; the effects of CHP utilization on bidding parameters are investigated; a modified heuristic and deterministic optimization algorithm is presented.
Assessing the nonlinear impact of economic growth and renewable energy consumption on CO2 emissions in India: recent evidence from smooth transition autoregression model
Authors: Ganie Anam Ul Haq , Ahmad Masroor 
Published: February 2024

Purpose
The purpose of this study is to investigate the nonlinear effects of renewable energy (RE) consumption and economic growth on per capita CO2 emissions during the time span from 1980 to 2020.

Design/methodology/approach
The study uses the logistic smooth transition autoregression (STAR) model to decipher the nonlinear relationship between RE consumption, economic growth and CO2 emissions in the Indian economy.

Findings
The estimated results confirm a nonlinear relationship between India’s economic growth, RE consumption and CO2 emissions. The authors found that economic growth positively impacts CO2 emissions until it reaches a specific threshold of 1.81 (per capita growth). Beyond this point, further economic growth leads to a reduction in CO2 emissions. Similarly, RE consumption positively affects CO2 emissions until economic growth reaches the same threshold level, after which an increase in RE consumption negatively impacts CO2 emissions.

Research limitations/implications
The study suggests that India should optimize the balance between economic growth and RE consumption to mitigate CO2 emissions. Policymakers should prioritize the adoption of RE during the early stages of economic growth. As economic growth reaches the specific threshold of 1.81 per capita, the economy should shift to more sustainable and energy-efficient practices to limit the effect of further CO2 emissions on further economic growth.

Originality/value
To the best of the authors’ knowledge, this study represents the first-ever endeavor to reexamine the nonlinear relationship between RE consumption, economic growth and CO2 emissions in India, using the STAR model.
An integrated DEA/GP based approach for designing healthcare supply chains with mixed data: a real world application
Authors: Chorfi Zoubida 
Published: February 2024

Purpose
As supply chain excellence matters, designing an appropriate health-care supply chain is a great consideration to the health-care providers worldwide. Therefore, the purpose of this paper is to benchmark several potential health-care supply chains to design an efficient and effective one in the presence of mixed data.

Design/methodology/approach
To achieve this objective, this research illustrates a hybrid algorithm based on data envelopment analysis (DEA) and goal programming (GP) for designing real-world health-care supply chains with mixed data. A DEA model along with a data aggregation is suggested to evaluate the performance of several potential configurations of the health-care supply chains. As part of the proposed approach, a GP model is conducted for dimensioning the supply chains under assessment by finding the level of the original variables (inputs and outputs) that characterize these supply chains.

Findings
This paper presents an algorithm for modeling health-care supply chains exclusively designed to handle crisp and interval data simultaneously.

Research limitations/implications
The outcome of this study will assist the health-care decision-makers in comparing their supply chains against peers and dimensioning their resources to achieve a given level of productions.

Practical implications
A real application to design a real-life pharmaceutical supply chain for the public ministry of health in Morocco is given to support the usefulness of the proposed algorithm.

Originality/value
The novelty of this paper comes from the development of a hybrid approach based on DEA and GP to design an appropriate real-life health-care supply chain in the presence of mixed data. This approach definitely contributes to assist health-care decision-makers design an efficient and effective supply chain in today’s competitive word.
More than morals: a simulation that supports sustainable management education
Authors: Lobre-Lebraty Katia , Heimann Marco 
Published: February 2024

PurposeWe explore how sustainable management education (SME) can help prepare future leaders to manage crises effectively. Precisely, the intricacies of articulating moral and economic imperatives for businesses in a manner that engages students in sustainable behavior are a serious challenge for SME. We study how to integrate reminders of moral and economic imperatives in a socially responsible investment (SRI) stock-picking simulation created for SME.Design/methodology/approachAdopting an experimental design, we analyzed how the reminders affected the average environment social governance (ESG) integration in the portfolios of 127 graduate students in finance over a twelve-week period.FindingsOur results show how essential it is to balance the two imperatives. The highest level of sustainable investment is attained when utilizing both reminders.Practical implicationsOur findings have practical implications for implementing and organizing SME in business schools to educate responsible leaders who are able to effectively manage crises. Learning responsible management is most effective when students are exposed to the inherent tension between moral and economic imperatives. Hence, our findings corroborate the win-win conception of SME.Originality/valueNo management decision study has experimentally measured the effects of SME practices on students' actual behavior. Our research fills this gap by complementing previous studies on the effectiveness of teaching practices, first by drawing on behavioral sciences and measuring changes in students' actual sustainability behavior and second by introducing moral and economic imperatives into an innovative teaching resource (TR) dedicated to SME.
Navigating the manufacturing revolution: identifying the digital transformation antecedents
Authors: Bilal Muhammad , Xicang Zhao , Jiying Wu , Sohu Jan Muhammad , Akhta Sadaf 
Published: February 2024

PurposeIn the era of digitalization, digital technology has transformed businesses and created enormous opportunities for organizations worldwide. Unsurprisingly, research on digital transformation has garnered significant interest among academics in recent decades. However, this study aims to recognize the key and holistic antecedents influencing digital transformation in manufacturing firms. This study also investigates the indirect relationships of antecedents with firm performance.Design/methodology/approachThe hypothesis was investigated using the partial least squares structural equation modeling (PLS-SEM) approach. The data was collected from 279 employees through a self-administered survey of manufacturing firms.FindingsThe results described a significant and positive impact of competitive pressure, leadership role, organization culture, organization mindfulness, government regulation, and IT readiness on digital transformation and firm performance. Furthermore, digital transformation partially mediates the relationship between antecedents and firm performance.Originality/valueThe study finds a holistic perspective of the critical antecedents of digital transformation using the mediation role of digital transformation and moderating effects of firm agility. Additionally, all antecedents have a significant association with Firm Performance.
An ethnographic study of police culture in a rural Kansas police agency
Authors: Davis Joshua J. , Birzer Michael L. 
Published: February 2024

PurposeThe study examined rural police culture in one Kansas police agency.Design/methodology/approachThis study used a qualitative ethnographic approach using in-depth interviews and non-participant observations to construct and interpret the culture of rural police through the lens of officers working in one rural police agency.FindingsFive themes were found that described the complexities rural police officers face at this research site, including the law being at the center of officers’ actions, the nature of crime, officers serving as jack of all trades, community relationships and enforcement of crimes by teenagers, and how outside pressures from the community and increased concern for citizens' safety affect officers' daily lived experiences.Originality/valueThere is a dearth of scholarly literature addressing rural and small-town policing. This study is the first known qualitative study to be conducted on rural Kansas police, allowing a snapshot of the workings of rural Kansas police.
Determination of SWCNT biosensor for bisphosphonate–2X(X = Mg2+, Ca2+, Sr2+) delivery in bone cell through electromagnetic and thermodynamic analysis using QM/MC methods
Authors: Mollaamin Fatemeh , Monajjemi Majid 
Published: February 2024

Purpose
Bisphosphonate (BP) medications can be applied to prohibit the damage of bone density and the remedy of bone illnesses such as osteoporosis. As the metal chelating of phosphonate groups are nearby large with six O atoms possessing the high negative charge, these compounds are active toward producing the chelated complexes through drug design method. BP agents have attracted much attention for the clinical treatment of some skeletal diseases depicted by enhancing of osteoclast-mediated bone resorption.

Design/methodology/approach
In this work, it has been accomplished the CAM-B3LYP/6–311+G(d, p)/LANL2DZ to estimate the susceptibility of SWCNT for adsorbing alendronate, ibandronate, neridronate and pamidronate chelated to two metal cations of 2Mg2+, 2Ca2+, 2Sr2+ through nuclear magnetic resonance and thermodynamic parameters. Therefore, the data has explained that the feasibility of using SWCNT and BP agents becomes the norm in metal chelating of drug delivery system which has been selected through alendronate → 2X, ibandronate → 2X, neridronate → 2X and pamidronate → 2X (X = Mg2+/Ca2+/Sr2+) complexes.

Findings
The thermodynamic results have exhibited that the substitution of 2Ca2+ cation by 2Sr2+ cation in the structure of bioactive glasses can be efficient for treating vertebral complex fractures. However, it has been observed the most fluctuation in the Gibbs free energy for BPs → 2Sr2+ at 300 K. Furthermore, Monte Carlo simulation has resulted by increasing the dielectric constant in the aqueous medium can enhance the stability and efficiency of BP drugs for preventing the loss of bone density and treating the osteoporosis.

Originality/value
According to this research, by incorporation of chelated 2Mg2+, 2Ca2+ and 2Sr2+ cations to BP drugs adsorbed onto (5, 5) armchair SWCNT, the network compaction would increase owing to the larger atomic radius of Sr2+ cation rather than Ca2+ and Mg2+, respectively.
Pelvic floor dysfunction after intervention, compared with expectant management, in prolonged second stage of labour: A population‐based questionnaire and cohort study
Authors: Bergendahl Sandra , Sandström Anna , Zhao Hongwei , Snowden Jonathan M. , Brismar Wendel Sophia 
Published: February 2024

AbstractObjectiveTo investigate the effect of vacuum extraction (VE) or caesarean section (CS), compared with expectant management, on pelvic floor dysfunction (PFD) 1–2 years postpartum in primiparous women with a prolonged second stage of labour.DesignA population‐based questionnaire and cohort study.SettingStockholm, Sweden.PopulationA cohort of 1302 primiparous women with a second stage duration of ≥3 h, delivering from December 2017 to November 2018.MethodsThe 1‐year follow‐up questionnaire from the Swedish National Perineal Laceration Register was distributed 12–24 months postpartum. Exposure was VE or CS at 3–4 h or 4–5 h, compared with expectant management.Main outcome measuresPelvic floor dysfunction was defined as at least weekly symptoms of urinary incontinence, pelvic organ prolapse or a Wexner score of ≥4. The risk of PFD was calculated using Poisson regression with robust variance estimation, presented as crude and adjusted relative risks (RRs and aRRs) with 95% confidence intervals (95% CIs). The implication of obstetric anal sphincter injury (OASI) on pelvic floor disorders was investigated through mediation analysis.ResultsIn total, 35.1% of women reported PFD. Compared with expectant management, the risk of PFD was increased after VE at 3–4 h (aRR 1.33, 95% CI 1.06–1.65) and 4–5 h (aRR 1.34, 95% CI 1.05–1.70), but remained unchanged after CS. The increased risk after VE was not mediated by OASI.ConclusionsPelvic floor dysfunction was common in primiparous women after a prolonged second stage, and the risk of PFD increased after VE but was unaffected by CS, compared with expectant management. If a spontaneous vaginal delivery eventually occurred, allowing an extended duration of labour did not increase the risk of PFD.
Renal disease is not associated with delays in hyperacute stroke management in South Australia
Authors: Goh Rudy , Bacchi Stephen , Kovoor Joshua G , Gupta Aashray K , Tan Sheryn , Stretton Brandon , Ovenden Christopher D , To Minh‐Son , Moey Andrew , Schultz David , Li Jordan Y , Juneja Rajiv , Kleinig Timothy , Jannes Jim 
Published: February 2024

AbstractObjectiveThe aims of the present study were to determine how renal disease is associated with the time to receive hyperacute stroke care.MethodsThe present study involved a 5‐year cohort of all patients admitted to stroke units in South Australia.ResultsIn those with pre‐existing renal disease there were no significant differences in the time taken to receive a scan, thrombolysis or endovascular thrombectomy.ConclusionsThe present study shows that in protocolised settings there were no significant delays in hyperacute stroke management for patients with renal disease.