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A parabolic trough solar collector is an advanced concentrated solar power technology that significantly captures radiant energy. Solar power will help different sectors reach their energy needs in areas where traditional fuels are in use. This study aims to examine the sensitivity analysis for optimizing the heat transfer and entropy generation in the Jeffrey magnetohydrodynamic hybrid nanofluid flow under the influence of motile gyrotactic microorganisms with solar radiation in the parabolic trough solar collectors. The influences of viscous dissipation and Ohmic heating are also considered in this investigation.

Governing partial differential equations are derived via boundary layer assumptions and nondimensionalized with the help of suitable similarity transformations. The resulting higher-order coupled ordinary differential equations are numerically investigated using the Runga-Kutta fourth-order numerical approach with the shooting technique in the computational MATLAB tool.

The numerical outcomes of influential parameters are presented graphically for velocity, temperature, entropy generation, Bejan number, drag coefficient and Nusselt number. It is observed that escalating the values of melting heat parameter and the Prandl number enhances the Nusselt number, while reverse effect is observed with an enhancement in the magnetic field parameter and bioconvection Lewis number. Increasing the magnetic field and bioconvection diffusion parameter improves the entropy and Bejan number.

Nanotechnology has captured the interest of researchers due to its engrossing performance and wide range of applications in heat transfer and solar energy storage. There are numerous advantages of hybrid nanofluids over traditional heat transfer fluids. In addition, the upswing suspension of the motile gyrotactic microorganisms improves the hybrid nanofluid stability, enhancing the performance of the solar collector. The use of solar energy reduces the industry’s dependency on fossil fuels.

This article unveils first the lead–lag structure between the confirmed cases of COVID-19 and financial markets, including the stock (DJI), cryptocurrency (Bitcoin) and commodities (crude oil, gold, copper and brent oil) compared to the financial stress index. Second, this paper assesses the role of Bitcoin as a hedge or diversifier by determining the efficient frontier with and without including Bitcoin before and during the COVID-19 pandemic.

The authors examine the lead–lag relationship between COVID-19 and financial market returns compared to the financial stress index and between all markets returns using the thermal optimal path model. Moreover, the authors estimate the efficient frontier of the portfolio with and without Bitcoin using the Bayesian approach.

Employing thermal optimal path model, the authors find that COVID-19 confirmed cases are leading returns prices of DJI, Bitcoin and crude oil, gold, copper and brent oil. Moreover, the authors find a strong lead–lag relationship between all financial market returns. By relying on the Bayesian approach, findings show when Bitcoin was included in the portfolio optimization before or during COVID-19 period; the Bayesian efficient frontier shifts to the left giving the investor a better risk return trade-off. Consequently, Bitcoin serves as a safe haven asset for the two sub-periods: pre-COVID-19 period and COVID-19 period.

Based on the above research conclusions, investors can use the number of COVID-19 confirmed cases to predict financial market dynamics. Similarly, the work is helpful for decision-makers who search for portfolio diversification opportunities, especially during health crisis. In addition, the results support the fact that Bitcoin is a safe haven asset that should be combined with commodities and stocks for better performance in portfolio optimization and hedging before and during COVID-19 periods.

This research thus adds value to the existing literature along four directions. First, the novelty of this study lies in the analysis of several financial markets (stock, cryptocurrencies and commodities)’ response to different pandemics and epidemics events, financial crises and natural disasters (Correia et al., 2020; Ma et al., 2020). Second, to the best of the authors' knowledge, this is the first study that examine the lead–lag relationship between COVID-19 and financial markets compared to financial stress index by employing the Thermal Optimal Path method. Third, it is a first endeavor to analyze the lead–lag interplay between the financial markets within a thermal optimal path method that can provide useful insights for the spillover effect studies in all countries and regions around the world. To check the robustness of our findings, the authors have employed financial stress index compared to COVID-19 confirmed cases. Fourth, this study tests whether Bitcoin is a hedge or diversifier given this current pandemic situation using the Bayesian approach.

Political dissent threads through the history of the Olympic Games. Although the International Olympic Committee (IOC) openly prohibits athletes from injecting politics into the Games, Olympians have nevertheless staged protests, using the Olympics to challenge the predominant power structures and institutions. This chapter analyzes outbursts of athlete activism in the context of wider social movements that make these political paroxysms more viable. Social movements scythe political space for athletes, spark athletes' political imaginary, and provide support and cover. From the early days of the Games, Olympic athletes have expressed dissent, as when Irish track-and-field athlete Peter O'Connor rebelled against British colonialism at the 1906 Olympics in Athens. At the Mexico City 1968 Games, Czech gymnast Vera Čáslavská carried out a politically symbolic acts as did US sprinters John Carlos, Tommie Smith, and Wyomia Tyus. At the 1972 Munich Games, US track medalists Vincent Matthews and Wayne Collett protested in nonchalant fashion on the medal stand. At the 1980 Olympics, Polish Olympian Władysław Kozakiewicz issued politically provocative symbology on the pole vault mat that challenged Soviet hegemony. In the twenty-first century, numerous Olympians have made political statements, despite a rule in the Olympic Charter that forbids such activity. In each case, athlete activists were bolstered by vibrant political movements in their home country. In this chapter, I trace the relationship between political Olympians and social movements as well as the wider dialectic of resistance and restriction that encompasses the interplay between dissident Olympians and the IOC.

This study aims to deal with entropy generation and thermal analysis of magnetic hybrid nanofluid containing silver and gold as nanoparticles (Au-Ag/NPs) in the Eyring–Powell fluid.

The blood is used as a base fluid to study the rheological effects in a wavy asymmetric channel. The effect of viscous dissipation is also taken into account. The mathematical model is developed using the lubrication technique. The perturbation method is used to solve the nondimensional nonlinear differential equations, whereas the pumping properties have been analyzed using numerical integration.

The impact of entropy generation, Brinkman number, Hartmann number, nanoparticles volume fraction, thermal Grashof number, Brinkman number and Eyring–Powell fluid parameter is examined on the velocity profile, temperature profile and pumping characteristics. It is observed that the introduction of gold and silver nanoparticles boosts the velocity field in a smaller segment of the channel. The temperature profile rises for the increasing values of Hartmann number, Brinkman number and nanoparticle volume fractions while the temperature profile is restrained by the Eyring–Powell fluid parameter. The pumping rate rises in all sections as the thermal Grashof number and Hartmann number increase; however, the Eyring–Powell fluid parameter has the reverse effect. The volume of the trapping boluses is significantly affected by the Eyring–Powell fluid parameter, thermal Grashof number and fluid parameter.

The results are original and contribute to discover the role of hybrid nanoparticles under the influence of entropy generation viscous dissipation and magnetic fields. Pharmaceutical technology may use this research for things like better mucoadhesive drug delivery systems and more productive peristaltic micropumps.

The #SayHerName movement aims to bring attention to the stories and lives of Blackgirlwomen who have died and/or been brutalized by the state/civilian “vigilante justice.” The culmination of the African American Policy Forum (AAPF) and The Center for Intersectional Policy Studies (CISPS), as well as legal scholar Kimberlé Crenshaw #SayHerName argues that the inclusion of Blackgirlwomen's experiences within the larger discourse of antiBlack violence brings a much-needed gender inclusive perspective. Drawing on Black feminist thought, this chapter articulates the multiple and complex meanings of #SayHerName by bringing attention to Blackgirlwomen as theorists, athletes, and activists whose lived experiences and contributions have long been marginalized.

The proliferation of ride-hailing businesses brings significant considerations for improving the driver's operational performance. Informed by the literature on sharing economy, general deterrence theory and protection motivation theory this research investigates the behavioral factors impacting ride-hailing drivers' operational performance.

The authors empirically test the antecedents impacting a ride-hailing driver's operational performance using an online survey dataset comprising 513 ride-hailing drivers working for Uber and Lyft in the United States.

Ride-hailing drivers' intention to comply with the ride-hailing company guidelines results in better operational performance for the driver. Moreover, drivers believe that ride-hailing companies have effective penalties to deter drivers from violating company guidelines. However, drivers also believe that the chances of being caught while ignoring the company guidelines are low.

The results of this research support the decision-making processes of ride-hailing company managers and offer insights on how managers can enhance the operational performance of their drivers.

This study provides unique contributions to emerging research at the intersection of peer-to-peer asset sharing, behavioral studies and technology management. This research is one of the first to explore the role of behavioral factors such as coping mechanisms on the operational performance of sharing economy workers.

This study aims to assess the scholarly communication competence of Zambian library and information science (LIS) professionals by evaluating their awareness, knowledge and practices regarding scholarly publication.

Applying a quantitative research approach, the study used a specially designed questionnaire. Responses from 57 professionals across universities and colleges in Zambia were gathered using convenience sampling. Data analysis involved descriptive statistics, mean and standard deviation calculations and t-values and p-values to understand respondents’ perceptions and knowledge of scholarly communication and publication.

The findings revealed significant gaps in respondents’ knowledge and awareness, particularly regarding predatory journals, journal selection factors, open-access models, publication challenges, reference management software (RMS) usage and research obstacles. The study underscored the necessity for increased training and capacity-building initiatives among Zambian LIS professionals to enhance their scholarly communication competence.

This research contributed to the field by highlighting deficiencies in scholarly communication awareness among Zambian LIS professionals. It emphasised the need for targeted interventions, awareness programs and educational support to improve academic literacy and scholarly publication practices. Additionally, the study suggested future research avenues, such as longitudinal studies and strategies for enhancing RMS adoption, to advance scholarly practices among Zambian professionals further.

In 2020, Sports Illustrated proclaimed its “Sportsperson of the Year” as something dubbed “the activist athlete,” choosing five athletes – LeBron James, Breanna Stewart, Patrick Mahomes, Naomi Osaka, and Laurent Duvernay-Tardif – that represented the term. Like so many athletes who came before them, these athletes vividly demonstrate the potential of sport to shine a spotlight on critical issues in society, yet again solidifying how sport does not exist merely as some kind of escape, but is a major stakeholder in global campaigns for social justice.

This chapter historicizes the contemporary resurgence of athlete activism, largely connected to the reawakening of Black Lives Matters (BLM) in 2020, within what journalist Howard Bryant has called The Heritage, with athletes who acknowledge and accept the charge to use their spotlights for those who have none. From the turning point of the Mexico City Olympics in 1968, which saw collective movements of African-American athletes culminate in the powerful Black power protest by Tommie Smith and John Carlos, a protest that built upon the legacies of so many, to the ongoing debates that surround the International Olympic Committee's (IOC) Rule 50, athletes have long understood how sport serves not only as an integral part of society but also as an agent for change. Contemporary cries for athletes to “shut up and dribble” echo past claims that sport takes place on a level playing field that transcends politics. The history of sports demonstrates otherwise, as athletes embody every imaginable, intersectional, classification of political actor.

Values have long guided special education services and supports for students with extensive support needs; over the past four decades, those values have been backed by research evidence demonstrating the critical nature of values related to inclusive education, self-determination, and seeking strengths and assets. In this chapter, we investigate these values and their supporting research, documenting strengths and needs in extant research. We emphasize the need to continue to embrace and maintain these values while pursuing research that addresses research gaps while centering the priorities, perspectives, and preferences of people with extensive support needs.

Sport organizations increasingly emphasize their support for lesbian, gay, bisexual, transgender and queer (LGBTQ) inclusion by promoting a perfect score on the Athlete Ally Equality Index, partnering with nonprofits to increase awareness of LGBTQ individuals in sport (e.g. Rainbow Laces campaign), or hosting a pride night for LGBTQ fans. Despite these and similar efforts, LGBTQ fans historically have felt unwelcome in sport settings, thereby signaling the need for inclusive fan codes of conduct. The purpose of this study was to examine both the prevalence and antecedents of such policies.

Using publicly available data sources, the authors focused on 350 Division 1 college athletic departments in the USA.

Results illustrate factors at both the macro (i.e. institution) and meso- (i.e. athletic department) levels interact to explain whether a school will possess a fan code of conduct. Specifically, research-intensive institutions with strong gender equity are more likely to possess a code of conduct than schools that are not research oriented and have weak gender equity. This project extends the understanding of LBGTQ inclusion in the sports industry.

The current study is the first to examine the prevalence and predictors of LGBTQ-inclusive fan codes of conduct. Understanding these dynamics can help athletic programs that want to create safe and inclusive sport spaces for LGBTQ fans and spectators.