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The purpose of this paper is to propose the complementary design rules, give a quantitative comparison and analyze the force production mechanism of two kinds of primary wound field flux-switching linear (PWFFSL) motors.

PWFFSL motors have the merits of no use of rare-earth magnet, low cost and a wide operation range in which the armature windings and the field windings are all located at the short primary mover and the secondary is very robust. Hence, the PWFFSL motor is ideal for rail transportation systems which need a long stator and a wide speed range. To overcome the disadvantages of the existing PWFFSL motors, new complementary design rules will be proposed. Also, to offer a better PWFFSL motor for the rail transportation systems, it is necessary to investigate different structures of PWFFSL motors and give a comprehensive comparison. To predict the force performance of two kinds of PWFFSL motors with different secondary types, their flux density analysis and force production mechanism will be presented and compared.

The comparison result shows that the PWFFSL motor with toothed secondary can offer larger thrust force, higher force density and higher efficiency, whereas the PWFFSL motor with segmented secondary has the merits of lower force ripple, less use of stator iron, higher power factor and less critical saturation.

Many PWFFSL motors with different primary/secondary pole pitches based on the proposed design principle have not been considered in this paper.

This paper has presented the air-gap flux analysis, proposed the complementary design rules for two kinds of PWFFSL motors with different secondary types and compared the electromagnetic performance of the two motors.

Emerging market multinational enterprises (EMNEs) have consolidated their global presence recently, challenging existing international business (IB) theories. One of their most significant characteristics has been the prevalence of strategic asset-seeking (SAS) mergers and acquisitions (M&As) targeting firms in developed countries. Such SAS M&As have been ascribed to the aim of acquiring or augmenting firm-specific advantages, rather than exploiting existing advantages. A literature review is needed to synthesize the growing number of academic studies and to contribute to ongoing theoretical developments on EMNEs' catch-up strategies.

The authors follow a standard systematic literature review approach. The authors collate academic studies on EMNEs' SAS M&As in developed markets published between 2000 and mid-2020, structuring the analysis using the logic of antecedent, process and performance outcomes.

The authors present recent research trends in terms of year, journal, theories and methods. The authors synthesize and analyze existing knowledge on EMNEs' SAS M&As and identify remaining gaps to suggest future research directions.

The review contributes by focusing on the key argument of current EMNE research – SAS M&As. By providing the first focused review on this topic, it provides a basis for further research on EMNEs' SAS M&As.

In the context of China, the purpose of this paper is to empirically answer three related questions: Could circular agriculture (CA) attain economic, ecological and social benefits simultaneously? What is key to a successful CA business in emerging economies? And who plays the vital role in building and sustaining a circular business?

The paper is based on a field study and looks at a farm in China. It uses a triangulation methodology to collect information. Besides longitudinal filed work at the farm, the researchers have also interviewed multiple stakeholders and conducted field research at the local markets.

With concrete performance data, the study proves that a circular approach can help achieve ecological, economic and social goals together. It shows that economic viability is essential to succeeding in circular operation, sufficient production pathways are required to make such operation sustainable, and entrepreneurship is key to build and grow a circular business.

The findings point to the crucial role of entrepreneurship in promoting the circular model in emerging economies. These findings, however, may not be readily generalizable, given the limitations of the case study approach.

The study highlights a few areas in which government assistance can make a difference, including financial incentives, information provision, technical support and most importantly the creation of a positive environment for entrepreneurial development.

While prior research emphasizes the role of government in promoting circular economy in developing and emerging markets, the study proves that entrepreneurship is key to turning government initiatives into economically viable and sustainable circular operation.