Amelia R. BRETONES, Rafael Gomez MARTIN and Alfonso SALINAS
A computer program named DOTIG1 was developed for the study, in the time domain, of the interaction of transient electromagnetic pulses (EMP) with structures modelled by thin…
Abstract
A computer program named DOTIG1 was developed for the study, in the time domain, of the interaction of transient electromagnetic pulses (EMP) with structures modelled by thin wires. The numerical procedure used is described and the results obtained with DOTIG1 are compared with those obtained, in the frequency domain, by other authors, using the Fourier transform. The comparison is specifically applied to the scattering cases from a simple stick model of an aircraft, from a wire cross in front of an infinite perfect conductor and from a junction of two wires with different radii.
Juan A. Morente, Jorge A. Portí, Cedric Blanchard, Bruno P. Besser, Herbert I.M. Lichtenegger, Alfonso Salinas, Enrique A. Navarro and Gregorio J. Molina‐Cuberos
Two transmission line meshes to simulate electromagnetic waves in the Earth's atmosphere are developed, one with the link transmission lines connected in parallel and the other…
Abstract
Purpose
Two transmission line meshes to simulate electromagnetic waves in the Earth's atmosphere are developed, one with the link transmission lines connected in parallel and the other with connections in series.
Design/methodology/approach
The equations describing propagation of waves through these parallel or series meshes are equivalent to the Maxwell equations for TEr or TMr modes in a spherical cavity with lossy dielectric material between the external conducting surfaces, respectively.
Findings
The transmission line meshes are used for a numerical study of the natural electromagnetic noise due to lightning discharges in the Earth‐ionosphere cavity.
Originality/value
The numerical algorithm finds values for Schumann resonances very close to the experimental ones, which allows us to affirm that this methodology is a valid numerical tool for predicting these resonances on other planets or moons as well.
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Jesús Fornieles Callejón, Alfonso Salinas and Rafael Gómez Martín
This paper describes a computer program DOTIG4, for the study in the time domain, of the interaction of transient electromagnetic pulses (EMP) with arbitrary perfect conducting…
Abstract
This paper describes a computer program DOTIG4, for the study in the time domain, of the interaction of transient electromagnetic pulses (EMP) with arbitrary perfect conducting (PEC) surfaces modelled by planar triangular patches. DOTIG4 is based on the solution of the Time Domain Electric Field Integral Equation (TD‐EFIE) by the method of moments (MoM) using a marching‐on‐in‐time procedure. The code is applied to transient scattering of several structures and to calculate the input impedance of several broadband antennas.
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Dean Neu, Leiser Silva and Elizabeth Ocampo Gomez
The purpose of this paper is to examine: how financial practices are diffused across countries and who are the carriers of diffusion; and to determine why the nature of adoption…
Abstract
Purpose
The purpose of this paper is to examine: how financial practices are diffused across countries and who are the carriers of diffusion; and to determine why the nature of adoption varies across countries and specific institutional fields and why certain practices are adopted in some settings but not in others.
Design/methodology/approach
In the macro portion of the study the authors document how World Bank loans in Latin America have encouraged the adoption of particular configurations of accounting and accountability practices. In the micro portion of the study, they analyze the cases of Guatemala and Mexico as a way of illustrating the ways in which the configuration of institutional players, capitals and habitus within these two sites have influenced the adoption of Bank recommended financial practices.
Findings
First, the analyses illustrate that the World Bank functions as an agent of diffusion via direct contact and through indirect modelling activities. Second, the analyses show that diffusion is not an automatic process – rather the predisposition of national governments, the embodied history of higher education and the distribution of capitals within the field influences whether financial reforms will be attempted. Third the analyses illustrate that, even when the introduction of new accounting and accountability mechanisms are attempted, other important field participants such as students can partially block the introduction of financial reforms.
Originality/value
The current study illustrates that international organizations such as the World Bank facilitate the diffusion of accounting and accountability practices but that local actors influence if, when and how accounting will be introduced and implemented.
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Alfonso Vargas-Sánchez and Adolfo Elizondo Saltos
The purpose of this study is to present the state-of-the-art scientific research in the intersection between smart tourism and social networks to better understand the role of the…
Abstract
Purpose
The purpose of this study is to present the state-of-the-art scientific research in the intersection between smart tourism and social networks to better understand the role of the latter (such as Facebook and Twitter) in the development of the smart paradigm in tourism, e.g. how the relationship between smart tourism and social networks has been observed by authors, or the techniques and analytical tools that are most broadly used to take advantage of available data in social networks to feed a smart logic in the management of tourism companies and destinations.
Design/methodology/approach
A systematic search in scientific databases (such as Web of Science and Scopus) was performed, with December 2018 as a closing date. Once duplications were eliminated and the adequacy the outputs obtained verified properly, a total of 61 documents were considered for this study, most of which were journal articles.
Findings
The characterization of research in this area with both a bibliometric and bibliographic analysis.
Practical implications
The presentation of a detailed picture on the content of the research carried out in the abovementioned intersections: evolution over time; most prolific authors, institutions and countries; journals, conferences and publishers that have paid more attention to this topic; type of research performed, objects of study, methodologies used and main contributions.
Originality/value
The proposal of a research agenda in the field under study. To the best of the authors’ knowledge, there is no a similar work carried out in this field.
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Carlos Dávila Ladrón de Guevara, Araceli Almaraz Alvarado and Mario Cerutti
Taking as reference a sample of around a hundred biographical materials on entrepreneurs in Mexico and Colombia, the purpose of this chapter is dual. Both to show the relevance…
Abstract
Taking as reference a sample of around a hundred biographical materials on entrepreneurs in Mexico and Colombia, the purpose of this chapter is dual. Both to show the relevance and varied modalities that the biographical approach has enjoyed in business history research since the 1990s, and to display the intrinsic potential this modality of scholarship entails for entrepreneurship endeavors. In particular, it discusses the prospects to incorporate this body of empirical works into the large Latin American audience attending undergraduate, graduate and executive education programs in business, economic history and related fields. The chapter is organized into three sections. The first two are devoted to illustrate relevant patterns in the entrepreneurial trajectory of individuals and entrepreneurial families studied in each of the two countries under consideration. The last section identifies some conceptual issues that may impact current debates on Latin American business development as exemplified in recent business and economic history journal venues and scholarly conferences.
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In this paper I explore how members of rural Maya households in central Quintana Roo (Mexico) interact with the wider social system and cope with long-term transformations in…
Abstract
In this paper I explore how members of rural Maya households in central Quintana Roo (Mexico) interact with the wider social system and cope with long-term transformations in productive relations since c. 1840. Maya householders integrate elements of capitalist and non-capitalist modes of production. Through particular cultural forms they regulate internal uses of wealth and their relationships with the larger capitalist world. Social and economic stratification is a fundamental feature of life among Maya householders today as it was in the past. While disparities between wealth strata within the local context have increased, the community is far from disintegrating into antagonistic groups.
Zijun Lin, Chaoqun Ma, Olaf Weber and Yi-Shuai Ren
The purpose of this study is to map the intellectual structure of sustainable finance and accounting (SFA) literature by identifying the influential aspects, main research streams…
Abstract
Purpose
The purpose of this study is to map the intellectual structure of sustainable finance and accounting (SFA) literature by identifying the influential aspects, main research streams and future research directions in SFA.
Design/methodology/approach
The results are obtained using bibliometric citation analysis and content analysis to conduct a bibliometric review of the intersection of sustainable finance and sustainable accounting using a sample of 795 articles published between 1991 and November 2023.
Findings
The most influential factors in the SFA literature are identified, highlighting three primary areas of research: corporate social responsibility and environmental disclosure; financial and economic performance; and regulations and standards.
Practical implications
SFA has experienced rapid development in recent years. The results identify the current research domain, guide potential future research directions, serve as a reference for SFA and provide inspiration to policymakers.
Social implications
SFA typically encompasses sustainable corporate business practices and investments. This study contributes to broader social impacts by promoting improved corporate practices and sustainability.
Originality/value
This study expands on previous research on SFA. The authors identify significant aspects of the SFA literature, such as the most studied nations, leading journals, authors and trending publications. In addition, the authors provide an overview of the three major streams of the SFA literature and propose various potential future research directions, inspiring both academic research and policymaking.