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Control of the rock motion associated with blasting can have significant economic benefits. For example, surface coal mining can be made more efficient if the overburden material can be cast further with explosives, leaving less work for mechanical equipment. The final muck pile shape in every type of surface and underground blasting is controlled by the blasting induced motion of the rock. A theoretically sound method of predicting rock motion will be beneficial to understanding the blasting process.

It is well known that precision of mass unbalance measurement of sphere is determined by perturbing moments in contactless suspension systems. Therefore, estimating perturbing moment level in those systems is important and necessary to meet the requirements of a specified precision of mass unbalance measurement.

In this paper, probability‐theoretic method is employed to determine probability characteristics of the perturbing moments in both electrostatic suspension system and gas suspension system by statistically estimating of the quality of sphere surface. As a result, the relationship between probability characteristics of the perturbing moment and statistical estimates of the quality of sphere surface is established. It is expressed as a simple formula by specifying the correlation function of random field of sphere surface.

Numerical experiments of the perturbing moment calculation in the two suspension systems show that for sphere with small correlation coefficient α, it is better to use gas suspension system for mass unbalance measurement. While for sphere with large correlation coefficient α, electrostatic suspension system is more suitable for its perturbing moment are less than gas suspension system.

Knowledge of this relationship is of great theoretic and practical importance, since the probabilistic depiction of the perturbing moments, and hence the accuracy of the mass unbalance measurement systems can be estimated without a detailed roundness measurement of the sphere surface.

The conception of a heat function, just like the stream function used in a laminar two dimensional incompressible flow field visualization, has been introduced to visualize the convective heat transfer or the flow of energy around a sphere when the sphere is either being cooled or heated by a stream of fluid flowing around it. The heat function is developed in a spherical polar coordinate and is used to generate the heat lines around the sphere. The heat lines essentially show the magnitude and direction of energy transfer around the sphere with and without the existence of a finite radial velocity at the surface. The steady state hydrodynamic field around the sphere is numerically obtained up to a maximum Reynolds number of 100 and the corresponding thermal field has been obtained by solving the steady state energy equation. The field properties thus obtained are utilized to form the heat function, which becomes an effective tool for visualization of convective heat transfer.

How does gender equity fare in the digital public sphere(s)? To understand the mechanism of the gender gap, this study analyzes the interaction of gender with class, age, and parenthood. With American national survey data, this research compares different types of online content production practices in this blurred digital public sphere(s). Findings show differences between men and women in five of six digital content creation activities. Women are more likely to consume online content; men are more likely to produce it. From more public blogging to more private chatting, inequality persists. Interactions with gender show (1) women from higher educational levels face more inequality compared to their male counterparts than do women from lower educational levels; (2) age is not a factor in the gender gap; and (3) generally, parental status fails to explain the production divide. Understanding the gender gap and its mechanisms can help ameliorate inequalities. Some argue that the Internet is a more egalitarian public platform for women while others find gender inequality. But neither body of research has attended to the blurring of the public and private spheres on the Internet.

This introduction unpacks the key question that informs the articles in this special issue. How does a social sphere inform regulation and, more specifically, how can the regulatory capacity of a social sphere be harnessed, as an alternative or significant complementary force to state regulation and reliance on the self-regulatory capacity of markets? This question is salient and topical also in light of the search for new regulatory strategies and perspectives in the aftermath of the 2007 financial and subsequent EU sovereign debt crises, which have led to a major realignment of economy and society in a number of countries.

This introduction argues that economic sociology is a crucial reference point for understanding more about the social practices that constitute business behavior. It enables to explore the scope and significance of often interlinked social and legal norms for regulating various transnational risks that economic activity can give rise to. The introduction therefore locates the quest for understanding more about the regulatory capacity of a social sphere in debates that draw on Karl Polanyi’s analysis of the embedding, disembedding, and re-embedding of economic activity into social norms. The introduction highlights one of the key themes developed in this special issue, the idea of society within economy which questions an assumed conceptual distinction between economy and society.

This introduction concludes by specifying how the accounts of risk regulation developed in this special issue chart a path that is different from recent explorations of the role of a social sphere in regulation, which were conducted under the banner of “the sociological citizen,” “regulatory sociability,” and “collaborative governance.”

This study aims to examine the flow of unsteady mixed convective hybrid nanofluid over a rotating sphere with heat generation/absorption. The hybrid nanofluid contains different shapes of nanoparticles (copper [Cu] and aluminium oxide [Al₂O₃]) in the base fluid (water [H₂O]). The influence of different shapes (sphere, brick, cylinder, platelets and blades) of nanoparticle in water-based hybrid nanofluid is also investigated.

To analyse the nanomaterial, the flow model is established, and in doing so, the Prandtl’s boundary layer theory is incorporated into the present model. The bvp4c approach, i.e. finite difference method, is used to find the numerical solution of differential equations that is controlling the fluid flow. The effect of relevant flow parameters on nanofluid temperature and velocity profile is demonstrated in detailed explanations using graphs and bar charts, whereas numerical results for Nusselt number and the skin’s coefficient for various form parameters are presented in tabular form.

The rate of heat transfer is least for spherical-shaped nanoparticle because of its smoothness, symmetricity and isotropic behaviour. The rate of heat transfer is highest for blade-shaped nanoparticles as compared to other shapes (brick, cylindrical and platelet) of nanoparticles because the blade-shaped nanoparticles causes comparatively more turbulence flow in the nanofluid than other shapes of nanoparticle. Heat generation affects the temperature distribution and, hence, the particle deposition rate. The absorption of heat extracts heat and reduce the temperature across the rotating sphere. The heat generation/absorption parameter plays an important role in establishing and maintaining the temperature around the rotating sphere.

The numerical study is valid with the exception of the fluctuation in density that results in the buoyancy force and the functional axisymmetric nanofluid transport has constant thermophysical characteristics. In addition, this investigation is also constrained by the assumptions that there is no viscosity dissipation, no surface slippage and no chemically activated species. The hybrid nanofluid Al₂O₃–Cu/H₂O is an incompressible and diluted suspension. The single-phase hybrid nanofluid model is considered in which the relative velocity of water (H₂O) and hybrid nanoparticles (Al₂O₃–Cu) is the same and they are in a state of thermal equilibrium.

Study on convective flow across a revolving sphere has its applications found in electrolysis management, polymer deposition, medication transfer, cooling of spinning machinery segments, spin-stabilized missiles and other industrial and technical applications.

The originality of the study is to investigate the effect of shape factor on the flow of electrically conducting hybrid nanofluid past a rotating sphere with heat generation/absorption and magnetic field. The results are validated and provide extremely positive balance with the recognised articles. The results of the study provide many appealing applications that merit further study of the problem.

The efficiency of a discrete element implementation relies on several factors, including the particle representation, neighbor‐sorting algorithm, contact resolution, and force generation. The focus of this paper is on the four‐arc approximation for an ellipsoid – a geometrical representation useful in simulations of large numbers of smoothly shaped particles. A new contact resolution algorithm based on the four‐arc approximation is presented, which takes advantage of the properties of the geometry to provide favorable empirical convergence properties compared with the method proposed earlier. Special attention is given to the software implementation of the algorithm, and a discussion of the computational efficiency of the algorithm is provided.

This paper aims to examine the experience of women entrepreneurs and the challenges and issues they face in reconciling the work activities of the family sphere with those of the entrepreneurial sphere.

This study is based on a materialist feminist perspective and a theory of living work that take into account the visible and invisible dimensions of the real work performed by women entrepreneurs. The methodology is based on a qualitative research design involving individual and group interviews conducted with 70 women entrepreneurs.

The results show the various individual and collective strategies deployed by women entrepreneurs to reconcile the work activities of the family and entrepreneurial spheres.

One of the major findings emerging from the results of this study relates to the re-appropriation of the world of work and organization of work by women entrepreneurs and its emancipatory potential for the division of labour. Through the authority and autonomy they possessed as business owners, and with their employees’ cooperation, they integrated and internalized tasks related to the work activities of the family sphere into the organization of work itself. Thus, not only new forms of work organization and cooperation at work but also new ways of conceiving of entrepreneurship as serving women’s life choices and emancipation could be seen to be emerging.

In museum research, museums are held as vital in maintaining the public sphere. This scoping review takes stock of the present status of museum–public sphere research by providing an overview of the existing literature as a point of departure for future research. In short, it maps the research aims, theoretical concepts, research methods and findings within the field and identifies research gaps.

A scoping review methodology is used to provide a knowledge synthesis of the museum–public sphere literature. This approach is instrumental for researching multi-disciplinary, fragmented or underdeveloped research fields. Reviews can help identify otherwise easily overlooked gaps in the research literature and are an essential tool.

Overwhelmingly, the published literature consists of case studies, some of which are theoretically ambitious. Still, cases are selected without explicit goals regarding analytical or theoretical generalization, and the studies are not placed within a theory-building framework. Moreover, the museum–public sphere research primarily focuses on museums in the core Anglosphere countries and is conducted by researchers affiliated with institutions in those countries. The museum–community relationship is a common research theme addressing engagement with the public through either visitor participation or community participation.

This is the first published scoping review or systematically conducted review and knowledge synthesis of the museum–public sphere research literature to our knowledge. The article finds and discusses a range of research gaps that need to be addressed theoretically and empirically.

The purpose of this paper is to analyze the reception and impact of Jürgen Habermas’s global academic best seller in the USA between 1974 and 2018. It specifically addresses the consequences of the long delay in the publication of the English translation of Habermas’s 1962 public sphere concept until 1989 in the context of Habermas’s paradigm shift from the Kantian ideal of a participatory democracy to a systems-theoretical interpretation of deliberative democracy, which informs Between Facts and Norms (1992/1996).

This paper can be classified as a “conceptual paper” that draws on empirical research, namely, Adrian Rauchfleisch’s (2017) bibliometric co-citation analysis of two decades of public sphere research, which features a multi-dimensional scaling of these research communities based on the distance matrix of the co-citation network.

As the 22,000 scholarly citations for structural transformation as of April 2018 already indicate, this paper confirms in detail that Habermas’s original public sphere concept attracts significantly more academic interest on an interdisciplinary basis than Between Facts and Norms, which no longer pursues a critical theory of contemporary democracy. Instead, this shift toward a uniquely sophisticated theory construction in the realm of normativity produces a work in Rechtstheorie (Thomas McCarthy) that is by definition removed from political practice. The paper demonstrates that only the criteria developed in structural transformation can be applied to the analysis of constitutional crises in the USA.

This paper was researched and written solely by the author. All sources are clearly identified.