Search results

The purpose of this conceptual chapter is to analyze the current state of the astructural bias in symbolic interactionism as it relates to three inter-related processes over time: (1) the formalization of critiques of symbolic interactionism as ahistorical, astructural, and acritical perspectives; (2) an ahistorical understanding of early expressions of the disjuncture between symbolic interactionism and more widely accepted forms of sociological theorizing; and (3) persistent and widespread inattentiveness to past and present evidence-based arguments that address the argument regarding symbolic interactionism as an astructural, ahistorical, and acritical sociological perspective. The argument frames the historical development of the astructural bias concept in an historically and socially conditioned way, from its emergence through its rejection and ultimately including conclusions about contemporary state of the astructural bias as evidenced in the symbolic interactionist literatures of the last couple of decades. The analysis and argument concludes that the contemporary result of these intertwined historical and social conditioning processes is that the astructural bias myth has been made real in practice, and that the reification of the myth of an astructural bias has had the ruinous effect of virtually eradicating a vital tradition in the interactionist perspective which extends back to the earliest formulations of the perspective. As a result, a handful of suggestions that serve to aid in reclaiming the unorthodox structuralism of symbolic interactionism and the related interactionist study of social organization are provided in the conclusion.

A history of the intellectual origins of the debate over the astructural bias is presented. The chapter summarizes both the emergent bias thesis and the charge of an astructural bias. The major works within this debate are reviewed. It has been found that the astructural bias still exists within the work of contemporary interactionists. The conclusion is that if interactionists want their work to be taken seriously, then they must seriously confront the distinguishing concept in sociology: social structure.

The purpose of this paper is to numerically investigate the flow characteristics and extend the data of friction factor and Reynolds number product of hydrodynamically developing laminar flow in three-dimensional rectangular microchannels with different aspect ratios.

Using a finite-volume approach, the friction factor characteristics of Newtonian fluid in three-dimensional rectangular ducts with aspect ratios from 0.1 to 1 are conducted numerically under no-slip boundary conditions. A simple model that approximately predicts the apparent friction factor and Reynolds number product f_appRe is referenced as a semi-theoretical fundamental analysis for numerical simulations.

The accurate and reliable results of f_appRe are obtained, which are compared with classic numerical data and experimental data, and the simple semi-theoretical model used and all comparisons show good agreement. Among them, the maximum relative error with the classic numerical data is less than 3.9 per cent. The data of f_appRe are significantly extended to other different aspect ratios and the novel values of f_appRe are presented in the tables. The characteristics of f_appRe are analyzed as a function of a non-dimensional axial distance and the aspect ratios. A more effective and accurate fourth-order fitting equation for the Hagenbach's factor of rectangular channels is proposed.

From the reliable data, it is shown that the values of f_appRe and the model can be references of pressure drop and friction factor for developing laminar flow in rectangular channels for researchers and engineering applications.

This paper aims to provide an overview of Keller’s ARCS (attention, relevance, confidence and satisfaction) model of motivational design and explores how three instruction librarians at different institutions have integrated the model into their teaching practices to improve student motivation during information literacy (IL) sessions.

Case studies describe how instruction librarians began to incorporate the ARCS model into library instruction. Three librarians used self-reflective practice and a range of assessment techniques to evaluate and improve teaching practice.

ARCS is valuable for improving student engagement during IL instruction. The authors suggest best practices for learning about and integrating the model and propose instructional strategies that align with it.

This paper fills a gap in literature on practical applications of motivational design in library instruction and suggests best practices for teaching and assessment using the ARCS model.

This paper aims to investigate the consequence of the combined impacts of an induced magnetic field and thermal radiation on peristaltic transport of a Carreau nanofluid in a vertical tapered asymmetric channel. The model applied for the nanofluid comprises the effects of Brownian motion and thermophoresis.

The governing equations have been simplified under the widespread assumption of long-wavelength and low-Reynolds number approximations. The reduced coupled nonlinear equations of momentum and magnetic force function have also been solved analytically using the regular perturbation method.

The physical features of emerging parameters have been discussed by drawing the graphs of velocity, temperature, nanoparticle concentration profile, magnetic force function, current density, heat transfer coefficient and stream function. It has been realized that the magnetic force function is increased with the increase of Hartmann number, magnetic Reynolds number and mean flow rate.

It may be first paper in which the effect of induced magnetic field on peristaltic flow of non-Newtonian nanofluid in a tapered asymmetric channel has been studied.

The purpose of this paper is to study the thermal and flow characteristics of a single annually finned-tube condenser. The velocity and the temperature field inside the fin channel are revealed. Changes of the heat transfer and the flow resistance for typical fin configurations are analyzed. The optimal combinations of the fin dimension in terms of the enhancement of heat transfer are suggested.

The problem has been numerically investigated with the FLUENT software. K-ɛ model is applied in the solution of the turbulent cases. The local and the average feature of the thermal performance and the friction factor are determined. Furthermore, the effect of the fin spacing, the fin height, and the fin thickness on the heat transfer and the flow resistance are verified.

The numerical results reveal that the fin spacing is the most influential factor of all fin dimensions not only to the heat transfer but also to the flow resistance. Both the heat transfer and the flow resistance are compared with those related data available in the public literature. On the other hand, the fin height and the fin thickness affect the heat transfer of the condenser in a much less significant way in comparison to that of the fin spacing.

This paper provides some meaningful information of the fin-dimensional effect on the heat transfer and the flow resistance for a single finned tube condenser. For such kind of heat exchanger, the heat transfer coefficient, the friction factor, and the heat transfer amount per unit length tube are all important to describe the performance feature.

The purpose of this study is to show the procedure, application and main features of the hybrid numerical-analytical approach known as generalized integral transform technique by using it to study magnetohydrodynamic flow of electrically conductive Newtonian fluids inside flat parallel-plate channels subjected to a uniform and constant external magnetic field.

The mathematical formulation of the analyzed problem is given in terms of a streamfunction, obtained from the Navier–Stokes and energy equations, by considering steady state laminar and incompressible flow and constant physical properties.

Convergence analyses are performed and presented to illustrate the consistency of the integral transformation technique. The results for the velocity and temperature fields are generated and compared with those in the literature as a function of the main governing parameters.

A detailed analysis of the parametric sensibility of the main dimensionless parameters, such as the Reynolds number, Hartmann number, Eckert number, Prandtl number and electrical parameter, for some typical situations is performed.

Mixed convection heat transfer in ventilated cavities submitted to a constant heat flux has been numerically studied using the Navier‐Stokes equations with the Boussinesq approximation. Results in terms of streamlines and isotherms are produced for different values of the governing parameters, namely, the Rayleigh number (10³ ≤q Ra ≤q 10⁶) and the Reynolds number (5 ≤q Re ≤q 5, 000). The geometrical parameters are the aspect ratio of the cavity A = L^’/H^’ = 2 and the relative height of the openings B = h^’/H^’ = 1/4. Results of the simulations show that the maximum interaction between natural and forced convection occurs for couples (Ra, Re) which can be correlated as Re = a Ra^b.

This chapter assesses the power focus in contemporary interactionist theory, and advances several premises about power based on recent research and theory. I first examine the main assumptions of the view of power that emerged in the wake of the astructural bias debate, which became an implicit standard for assessments of power in the tradition. Next, I explore the criticisms of the astructural bias thesis and related conceptualization. My argument is that while the debate correctly spotlighted the power deficit of interactionism, it had theoretical implications that distracted us from the task of fully conceptualizing power. In the second part of this chapter, I examine recent interactionist work in order to build general premises that can advance interactionist theory of power. Based on this analysis, I elaborate four premises that interactionists can use, regardless of theoretical orientation. Drawing on examples from my ethnographic research, I illustrate how researchers can benefit from the use of these premises.

Maintaining the turbine blade’s temperature within the safety limit is challenging in high-pressure turbines. This paper aims to numerically present the conjugate heat transfer analysis of a novel approach to mini-channel embedded film-cooled flat plate.

Numerical simulations were performed at a steady state using SST k – ω turbulence model. Impingement and film cooling are classical approaches generally adopted for turbine blade analysis. The existing film cooling techniques were compared with the proposed design, where a mini-channel was constructed inside the solid plate. The impact of the blowing ratio (M), Biot number (Bi) and temperature ratio (TR) on overall cooling performance was also studied.

Overall cooling effectiveness was always shown to be higher for mini-channel embedded film-cooled plates. The effectiveness increases with increasing the blowing ratio from M = 0.3 to 0.7, then decreases with increasing blowing ratio (M = 1 and 1.4) due to lift-off conditions. The mini-channel embedded plate resulted in an approximately 21% increase in area-weighted average overall effectiveness at a blowing ratio of 0.7 and Bi = 1.605. The lower uniform temperature was also found for all blowing ratios at a low Biot number, where conduction heat transfer significantly impacts total cooling effectiveness.

To the best of the authors’ knowledge, this study presents a novel approach to improve the cooling performances of a film-cooled flat plate with better cooling uniformity by using embedded mini-channels. Despite the widespread application of microchannels and mini-channels in thermal and fluid flow analysis, the application of mini-channels for blade cooling is not explored in detail.