Search results

The purpose of this paper is to identify on the instantaneous electrical power basis of a nonsinusoidal periodic current three-phase asymmetric system, active and reactive positive, negative and zero sequence powers, taking into account higher harmonics. The main power theories, including those embodied in the IEEE 1459 standard, do not allow to evaluate some of power components.

A well-known fact is that the three-phase AC system total power with the symmetry of currents and voltages is constant. It corresponds to the electrical energy transfer process in a DC system. In this case, the electrical energy transmission can be taken as high quality. It has been established that the components of active and reactive powers are because of the product of current and voltage of unidirectional sequences. The orthogonal components of the oscillating power are because of the product of the voltage and current components of different sequences, with the exception of the zero sequence.

For an unbalanced nonsinusoidal mode of a three-phase system, the components of instantaneous power were defined, corresponding to the active and reactive positive and negative and zero sequences powers with the selection of the fundamental and higher harmonics. The active and reactive powers of sequences were divided into two categories – consumed and generated.

It is proposed to use the ratio of “interfere” power RMS value to the total power RMS value to assess the instantaneous power distortion.

The paper deals with the impact of long‐term persistent interregional disparities on the performance in transition to market economy. In the case of Poland, owing to the turbulent history, partitions and geopolitical displacements, the main institutions were shaped both by the country's traditions and various foreign impositions. First, it is shown that to a large extent, the substantial interregional discrepancies which widened in the 1990s can be traced back to a distant past. Second, we point out that those regions which inherited a higher overall economic development, superior physical infrastructure, and high endowment in social capital, have better performed on the way to market economy. Third, we advance the explanatory model of historical path dependence that includes both self‐reinforcing and reactive historical sequences, and either homogenizing or diversifying external shocks. Finally, we argue that the social capital has been preserved in the form of community norms and customs.

Purpose – Agribusiness is crucial for the Brazilian trade balance surplus. Innovation, not only that focused on technology or productivity, is a basic condition for its development. The context of the agribusiness activities in a developing country is dynamic and requires a multilevel and multifaceted view. This suggests that these features need to be incorporated both in the theories and methods. Therefore, we propose a method, from within the perspective of Configurations Theory, of capturing this dynamic multidimensionality. The method was applied in the context of the rice-farming business in Southern Brazil.

Methodology/approach – The proposed method, which we refer to as a Case Study Method with Multiple Units of Analysis and Mixed Methods, was applied in a research organization in an attempt to identify the evolution of innovation while considering a theoretical perspective based on multilevel rules.

Findings – Six different configurations in the temporal organization of research were identified. These six configurations describe the evolution of four emphases given to innovation, the drivers associated with the evolution of these emphases, and the changes that have occurred over time.

Social implications – The results may provide support for new public policies for rice farming and lead to improvements in the organization's strategies for innovation.

Originality/value of chapter – The combination of methods used (Case Study, Qualitative Comparative Analysis, Social Network Analysis, Path Dependence, and Patterns of Decision Making) to study configurations, together with the dynamic approach to innovation based on multilevel rule, is unique.

Prevailing explanations of the US secession crisis trace the latter’s origins to slavery and slaveowners’ interests. The central problem with all such explanations, however, is that the Whig Party, the party of the largest slaveowners, opposed secession until the mid-1850s. Why did southern Whigs and their planter base resist secession through the political crisis over slavery only to fold by 1861? Drawing on archival electoral returns by precinct, party newspapers, speeches, and personal correspondence from antebellum Tuscaloosa County, Alabama, I argue for an institutional and sequential approach to the secession crisis that does not take social actors’ individual interests as given, but rather as naturalized and denaturalized in the back and forth struggle of political parties to advance competing solutions to the problem of preserving slavery.

Recently there has been a strong trend towards automation in the mine industry. This paper seeks to describe and analyse an algorithm that can be used as a part of an infrastructure‐free reactive navigation system for autonomous vehicles in underground mines.

The idea presented here to enable infrastructure‐free autonomous navigation is to combine reactive behaviours for tunnel following, with topological localization. To assess the reliability and precision of the corridor detection algorithm real data recorded in both indoor and mine environments have been used.

In the research it was found that the algorithm is able to reliably detect corridors even in difficult environments such as office corridors where a large part of the walls are made of glass or in mine tunnels with a high intensity of intersections. It was also concluded that the algorithm provides good enough precision and robustness to noise in the data to enable reactive tunnel following.

This paper presents an algorithm for corridor detection, intended to be used in combination with reactive behaviours for tunnel following in underground mines. To enable fully autonomous navigation, functionality to detect and turn at intersections also needs to be developed.

This research shows that corridor detection can be used for reactive tunnel following in certain underground mine types, and that the concept of using reactive tunnel following in combination with topological localization is worthy of continued development.

This paper has presented a new algorithm for corridor detection based on the Hough transform. The algorithm is robust to noise in the data and can reliably detect corridors even where the surfaces of the walls are uneven and slightly curved.

While numerous articles have stressed the importance of developing and maintaining supply networks, there is still a dearth of studies that address how supply networks arise and change over time. The purpose of this article is to describe and conceptualise how a firm initiates the development of a supply network, and how the structure of the firm's supply network and supply base change over time as a consequence of the type and duration of initiative taken?

Empirically, the article is based on a longitudinal, single case study, which is real‐time, theory‐led and contextual. The case study concerns the efforts of a main contractor (within the construction industry) who changed its sourcing strategy, initiated the development of a supply network, and restructured part of its supply base. Theoretically, the article reviews both supply base and supply network management literature, highlights important issues related to both concepts, and discusses similarities and differences between them.

It is possible to discern between supply network initiatives of more permanent versus more temporary character. Supply network initiatives of a more permanent character comprise the establishment of, for example, organisational structures, functions, manuals and (explicit) routines aimed at continually supporting the maintenance of the supply network. Supply network initiatives of a more temporary character are organised as projects and aim to set in motion a process that may result in the creation of a supply network which develops over time without institutionalised network support structures. A single temporary supply network initiative is useful to consider in relation to the pre‐initiative stage, the ongoing initiative stage and the post‐initiative stage of the initiative. Furthermore, supply networks may be managed through an emergent series of temporary supply network initiatives aimed at supporting the supply network as it emerges over time in a changing context.

Managers may benefit from considering whether a supply network initiative is of a more permanent or a more temporary nature. If it is of a more temporary character, managers may consider analysing the initiative in its pre‐initiative, ongoing initiative, and post‐initiative stages in order to reflect on and learn from the initiative. Furthermore, if the initiative is temporary but form part of a planned or an emerging sequence of initiatives, managers may search for and consider earlier initiatives which may be viewed as “experiments” in a emerging trial‐and‐error learning process aimed at managing supply networks.

The article illustrates how a temporary supply network initiative can be used as a means to instigate reform of a supply base.

The purpose of this paper is to examine the dynamic nature of consumer value by proposing a causal model that shows the existence of sequentiality in value dimensions and in their influence on satisfaction and loyalty. The paper focuses on intrinsic dimensions of value (play, aesthetics, ethics and escapism), which are fully experiential, and therefore less studied in the literature.

The conceptual model proposed was empirically tested in tourist hotel accommodations. Data were collected through a structured questionnaire, analyzing the experiences of 285 hotel guests with structural equation modeling-partial least squares.

The results reveal that the reactive dimensions of value (aesthetics and escapism) influence the active ones (play and ethics), which in turn affect consumers’ satisfaction and loyalty.

This paper is exploratory and focuses on the intrinsic dimensions of value. Future research should consider the entire extrinsic/intrinsic value duality. This paper is based on a convenience sample consisting solely of hotel accommodation. Further studies based on a random sample and on other hospitality contexts would be required to generalize the results.

This paper can help hotel managers to understand the role and importance of each intrinsic dimension of value to successfully implement their relationship marketing strategies, defined by the chain value-satisfaction-loyalty.

This paper depicts the dynamic nature of value, with concatenated (and not simultaneous) effects of value dimensions on satisfaction and loyalty, which supports research in value co-creation.

The aim of this paper is to propose an integrative framework of organizational decline on the firm‐level.

In recent years, there has been a growing number of contributions to the research field of organizational decline from diverse theoretical perspectives and different levels of analysis. In this paper, an integrative framework of organizational decline on the firm‐level is proposed that relies on a process perspective, combining insights from organizational ecology, path dependence and the resource‐based view.

Different theoretical perspectives are used to explore various aspects of the problem of organizational decline. A theoretical framework as a theoretical perspective is developed to guide research and to interconnect diverse theoretical findings. Based on the suggested framework, two archetypes are distinguished which lead an organization to insolvency: malabsorptive incompetence and maladapted competencies.

The proposed framework allows the capture of the dynamic process of organizational decline and the identification of the triggers driving organizational decline.

This article aims to describe patterns of change in innovation networks and to clarify the roles of time and history in shaping network trajectories. The authors test seven predictor variables and their interactions to examine their influences on network performance over time.

A fuzzy simulation of innovation networks and investigations of different network types, using two classes of growth modeling techniques, help refine understanding of innovation as an interactive, developmental process.

Innovation network trajectories are influenced by self-reinforcing, contradictory and damaging forces. History affects network trajectory development, particularly with regard to financial resource access. The temporal processes reveal three contrasting classes of developmental trajectories for innovation networks.

The study methodology can account for theoretically derived factors leading to innovation, in and across types of networks and for changes over time; it moves beyond a cross-sectional approach. Although the model structure is generic, the parameters are based on a radical innovation, so the findings may not transfer directly.

Managers in innovation business networks can use the identified variables to improve network performance, by facilitating processes that inject financial capital and integrating heterogeneous skills that focus on a wider variety of skills that generate both exploratory and exploitative knowledge development.

This article contributes to discourses on network trajectories through an analysis of processes that influence the growth and decline of innovation business network performance. An original methodology generates and analyzes dynamic longitudinal network data.

The Group of 20 (G20) is tasked with responding to economic shocks in the global financial system, with COVID-19 having proved to be the most significant shock since the G20's inception. COVID-19 also represents the first economic crisis accompanied by a concerted attempt to “build back better”, principally through a climate-compatible recovery. In 2021, there is little clarity as to the G20's response to this challenge, primarily due to considerable divergence in the green stimulus practices of its member states. The paper aims to investigate whether the G20, climate change and COVID-19 are critical juncture or critical wound.

Historical institutionalism (HI) suggests that one can explain an institution's future response by reference to its developmental pathway to date. This contribution adopts its concept of “critical junctures” to shed light on the G20's possible institutional response to COVID-19. The contribution undertakes a comparative analysis of the global financial crisis (GFC) and COVID-19 as possible critical junctures for the G20.

In doing so, the work demonstrates that the G20 “building back better” from COVID-19 requires a shift away from its institutional orthodoxy to a much larger degree than its response to the GFC. Accordingly, whilst both the GFC and COVID-19 may be considered critical junctures for the G20, only COVID-19 has the potential to be a “critical wound” that leads to institutional redundancy.

Through interrogating this further, this exposition prospectively outlines two possible futures the G20 faces as a consequence of COVID-19: reform or redundancy. In this way, it offers an ex ante perspective on policy-reform options for the G20's ongoing response to COVID-19.

Whichever choice the G20 makes in its response to COVID-19 has profound consequences for global governance in an increasingly unpredictable world.

Herein lies the importance of an exploratory assessment of COVID-19 as a critical juncture or a critical wound for the G20.