A New Du Boisian Sociology has recently clarified, elevated, and synthesized Du Bois’s sociological contributions. We argue that more systematic and detailed study of Du Bois’s research methodologies, with an eye towards their contemporary applicability, can further strengthen this body of scholarship. Here we begin this effort with sustained attention to Du Bois’s use of quantitative data and methods during a productive and illustrative period around the turn of the twentieth century (1898–1902). This adds a level of depth and specificity to a subset of existing Du Bois scholarship that has more generally noted quantitative inquiry as one aspect of Du Bois’s social-scientific approach of mixed-methods triangulation. We detail how and why Du Bois developed an inductive, theoretically generative approach to his research on race. This orientation appears, at first glance, to be a misfit for contemporary quantitative sociology, which is currently skewed towards deductive theory testing and causal inference. We demonstrate that Du Bois’s quantitative methodology invites sociologists to return to exploratory, descriptive, and theoretically generative quantitative research based on creative syntheses of primary and secondary data that span generations and levels of institutional and geographic aggregation. Such data can, among other possibilities, assess within- and between-race comparisons and intersections of race with factors including class, gender, age, place, and time. Our study also enters Du Bois, as historical precedent, into current debates regarding quantification’s productive role, if any, in social science research on race/racism and other axes of systemic inequality.

Wireless power transfer (WPT) has attracted attention from academia and industry in recent years. WPT has natural electrical isolation between primary and secondary side, which ensures safe charging in an underwater environment. This breakthrough technology greatly facilitates the deep-sea power transmission. However, at the current stage the transferred power and energy efficiency level are not up to that of the WPT system in the air. The major concerns include the attenuation is seawater, extreme temperature and pressure conditions, disturbance of ocean currents, and bio-security. Three questions are answered in this paper: first, the expressions of eddy current loss and attenuation of electromagnetic wave in seawater are unified, and the influence of seawater as transmission medium on the WPT system is discussed. Second, the evolution of electromagnetic coupling structure suitable for underwater applications is studied. Third, the loss and heating effects of an underwater WPT system and the corresponding bio-fouling phenomenon are investigated. The questions above were addressed through analysis of electrical properties, coupler structures, and bio-fouling effects of the underwater WPT system. This paper will facilitate the study and research on underwater WPT applications.

This paper presents the results of an experimental campaign to measure thruster-relevant parameters for a high-power (180kW) inductive propulsion system utilising Ar, $ {\textrm{O}}_{2}$ , $ \textrm{N}_{2}$ , and $ \textrm{CO}_{2}$ as propellants. Results from the investigation show that inductive thrusters can make use of these propellants without the severe degradation seen in other electric propulsion systems. Furthermore, the collection of experimental data at powers greater than 100kW provides a reference of performance for the high-power electric propulsion devices intended for missions in the near future. Thrust and specific impulse in inductive systems can be improved by preferentially combining the chemical properties of atomic and molecular propellants. The maximum thrust recorded during these experiments was 7.9N, obtained using a combination of argon and oxygen (0.68 Ar + 0.32 $\textrm{O}_{2}$ ). The combination of argon and molecular propellants also decreased thermal losses within the discharge volume. Specific impulse can be doubled for the same input electric power by combining propellants, and future modifications to the thruster geometry and acceleration mechanism can be used to further improve the performance of such systems.

This paper illustrates how a freely available online corpus has been exploited in a module on teaching business letters covering the following four speech acts (functions) commonly found in business letters: invitations, requests, complaints and refusals. It is proposed that different strategies are required for teaching potentially non-face-threatening (invitations, requests) and face-threatening (complaints, refusals) speech acts.

The hands-on pedagogic activities follow the ‘guided inductive approach’ advocated by Johansson (2009) and draw on practices and strategies covered in the literature on using corpora in language learning and teaching, viz. the need for ‘pedagogic mediation’, and the ‘noticing’ hypothesis from second language acquisition studies.

The purpose of this article is to approach the heuristic potency of coloniality illustrated by reference to the emergence of African theologies. Coloniality refers to subjugating strategies found in mission discourses which are not unrelated to wider colonial violence. It will be argued that such an analytic category, which arises from historical experiences of mission malpractice, has particular theological and methodological significance. Consequently, post-colonial Anglicanisms will affirm particularism, experiential interfaces and inductive theologizing.