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This paper presents a method for designing a fixed controller, which is able to control in a stable fashion a family of linear time‐invariant n‐th order plants with arbitrary relative degree. This plant family is defined in terms of a nominal transfer function of rational type and bounded variations of the coefficients of numerator and denominator polynomials. The design method is based on the algebraic relationship existing in the model reference adaptive control technique between the true plant parameters, the ideal controller parameters and the model reference parameters. While applying the proposed method, the resulting plant families are broader if compared with other techniques used to design robust controllers.

In a pandemic framework (COVID-19), this chapter explores the impact of the global economy and socio-cultures concerning three axes: recreational, tourism, and hospitality. Although we slowly see an economic revival, it is well known that this sector of study is very susceptible to being affected by the context of nations. Following restrictions and measures taken by governments around the world to reduce the number of cases of coronavirus infections, many nations closed their borders, affecting international travel and by 2020 tourism had been reduced to the near cessation of operations due to the imminent fear of this poorly studied disease, and the service sector was negatively affected. It should be added that, according to the World Tourism Organization's projections, a decrease of between 20 and 30% is forecast for 2020 compared to the previous year.

The purpose of this paper is to examine, through a microeconomic analysis, the extent to which trip characteristics influence tourism expenditure in 14 emerging urban-cultural cities in Andalusia (Spain).

This analysis was carried out using an ordinary least squares method, which measures influence on tourism expenditure based on the trip characteristics of tourists visiting emerging urban-cultural cities. For this, the authors used 3,030 surveys conducted on tourists who, in 2013, visited 14 emerging urban-cultural cities in Andalusia (Spain).

It was confirmed that certain trip characteristics – type of accommodation, length of stay, trip planning and internet use – determine tourism expenditure in these destinations. The findings provide stakeholders in these destinations with information for the implementation of policies aiming to increase revenue in destinations where tourism development levels are still in their infancy and where, therefore, there are many unexploited opportunities.

First, this study identifies those trip characteristics which influence tourist expenditure in emerging urban tourist destinations. These destinations, to date, had not been previously analysed in expenditure segmentation studies. Second, aside from the factors traditionally analysed in scientific literature, other trip-specific variables were considered; these relate to the means by which tourists familiarise themselves with their destination and the way in which they plan their trip (use of the internet), as the rise of new technologies has radically changed tourism.

The purpose of this paper is to analyze the role of four important variables in the development of customer loyalty in mobile commerce. These variables are personal (propensity to use information and communication technologies (ICTs)), transactional (opportunism), and relational (trust and satisfaction).

A broad sample of 1,053 mobile customers in Mexico was studied using the structural equation analysis methodology.

The results offer evidence on how trust and satisfaction can increase loyalty and motivate purchases via mobile devices. In addition, the results show evidence of the indirect effect (mediated through trust) of opportunism, and propensity to use ICTs on loyalty.

Achieving customer satisfaction is revealed as the main strategy enterprises should seek in order to encourage repetitive purchases via mobile devices and customer loyalty. At the same time, companies should consider that the customers most likely to use ICTs, and those who perceive less opportunism can also be very loyal as a result of a higher level of trust when making purchases using mobile devices.

The contributions of this paper are: (1) to analyze the generation of loyalty in mobile commerce using a conceptual model that includes variables of different theoretical perspectives and nature, both positive and negative. (2) To provide empirical evidence from a sample of mobile users who have already bought goods via mobile phone, contributing to prior literature that has focused on analyzing the behavior of mobile phone users who do not make purchases via mobile phones. (3) To study mobile commerce in an emerging market with notable potential for growth (Mexico), which has not been studied at length in previous literature.

El presente trabajo analiza el papel de cuatro importantes variables en el desarrollo de la lealtad de los compradores por móvil. Variables de índole personal (propensión al uso de las TICs), transaccional (oportunismo) y relacional (confianza y satisfacción).

Una amplia muestra de 1053 compradores por móvil en México es analizada mediante la metodología de ecuaciones estructurales.

Los resultados ofrecen evidencia sobre la capacidad de la confianza y la satisfacción para incrementar la lealtad y motivar la compra a través del móvil. Además, se muestra evidencia del efecto indirecto (mediado a través de la confianza) del oportunismo y la propensión al uso de las TICs sobre la lealtad.

La consecución de la satisfacción del comprador se revela como la principal estrategia que deben seguir las empresas que buscan fomentar la repetición de la compra a través del móvil y la confianza de sus actuales compradores. A la par, las empresas deben considerar que los clientes más propensos al uso de las TICs y los que perciben menos oportunismo pueden ser más leales, al aumentar su confianza en la compra por móvil.

Las contribuciones son: (1) Analizar la generación de la lealtad en el comercio móvil utilizando un modelo conceptual que incluye variables de distintas perspectivas teóricas y de naturaleza tanto positiva como negativa. (2) Ofrecer evidencia empírica de una muestra de usuarios de teléfono móvil que ya han comprado por este medio, contribuyendo a la literatura previa que se ha centrado en analizar el comportamiento de los usuarios de teléfono móvil no compradores. (3) Estudiar el comercio móvil en un mercado emergente (México) poco estudiado en la literatura previa y con un notable potencial de crecimiento.

It is a well known problem the interactions between the market value of cash flows and the discount rate (usually the weighted average cost of capital, WACC) to calculate that value. This is mentioned in almost all text books in corporate finance. However, the solution adopted by most authors is to assume a constant leverage D%, and hence assume that the leverage gives raise to an optimal capital structure and the discount rate is constant. On the other hand, most authors use the definition of the Ke, the cost of leveraged equity for perpetuities even if the planning horizon is finite. Among these authors we find the work of Wood and Leitch W&L 2004. In this article we wish to analyse the claim made by W&L 2004 in the sense to have found an iterative solution to the problem of circularity that results in a “near” matching with the Adjusted Present Value APV, proposed by Myers, 1974. They use as the basic principle the fact that there is a “near” constant relation between Ke the cost of equity and Kd the cost of debt. They consider as well that the cost of debt Kd is not constant and changes proportionately with the leverage D%. We propose a very simple and precise approach to solve the above mentioned circularity problem.

Science, Technology, Engineering, and Mathematics (STEM) education, its importance, and its difficulties have been defined. This chapter seeks to present the digital tools that have been used during the pandemic period and that have been focused on promoting STEM education at different levels. The efforts made by educational organizations worldwide are mentioned. Different regions are shown presenting the best experiences of digital tools that enhance the elements of STEM and can be extended to different levels of education from elementary school to university. On the other hand, successful experiences of the use of technological tools from the teachers' point of view are shown, depicting the tools that have worked the most during the process of adapting to online classes to devise a much better educational plan that continues to take advantage of digital tools for STEM education.

Latin American countries must prioritize energy efficiency and renewable energies in their energy policies. This has been debated for the past few decades. However, it is impossible to deny that energy efficiency and renewable energies have significant potential to mitigate the adverse effects of ever-increasing energy consumption induced by economic growth and the transformation of societies toward more energy-intensive models. This chapter identifies how sustainable energy policies could be considered successful in various Latin American economies through an active review and comparison of traditional energy models and their transition and respective consequences. The chapter concludes that there are national energy plans in countries in the region with a sustainable approach, and that clean energy and renewable sources have great potential. But it is also concluded that there is still a long way to go concerning legislation and legal frameworks.

In the academic field of business management, several potential theories were established during the last decades to explain companies' decisions, organizational behavior, consumer patterns, and internationalization, among others. As a result, businesses and scholars were able to analyze and decide based on theoretical approaches to explain the current conditions of the market. Secondary research was conducted to collect more than 36 management theories. This chapter aims to develop the most famous theories related to business applied in the international field. The novelty of this chapter relies on the compilation of recognized previous research studies from the academic literature and evidence in international business.

A mixed-method study was performed to determine the impact of integrating systems thinking (ST) into an electronic learning module for junior high school teachers in the Philippines. The study aims to assess how an ST approach to pedagogy compared against a conventional approach in terms of contribution to the participants’ global climate change content knowledge, holistic thinking and depth and accuracy of knowledge and reasoning.

The study implemented e-learning modules using an ST approach versus a conventional approach in teaching climate science to junior high school teachers. The paper presents quantitative data obtained from pre and posttests results of the 20 teacher-participants and qualitative data obtained during the focus-group discussion (FGD) after the implementation of the study.

The results from the statistical analysis indicated that the ST group obtained a significant increase in their assessment scores compared to the non-ST group, according to predetermined criteria. Content knowledge, depth and accuracy of knowledge and reasoning increased the most. The participants mentioned during the FGD that the module helped deepen their understanding of climate change.

The study was limited to 20 teacher-participants, but it has relevance for public school teachers in the country given that participants had raised concerns regarding the lack of training in their schools for teaching climate science. They admitted that they lacked critical information to include in climate change topics in their classes.

This paper shows how the ST approach can be used to teach climate change to junior high students. The e-learning module can provide teachers with better understanding, knowledge and reasoning to teach climate change to high school students more effectively.

Acute and chronic pain affects more Americans than heart disease, diabetes, and cancer combined. Conservative estimates suggest the total economic cost of pain in the United States is $600 billion, and more than half of this cost is due to lost productivity, such as absenteeism, presenteeism, and turnover. In addition, an escalating opioid epidemic in the United States and abroad spurred by a lack of safe and effective pain management has magnified challenges to address pain in the workforce, particularly the military. Thus, it is imperative to investigate the organizational antecedents and consequences of pain and prescription opioid misuse (POM). This chapter provides a brief introduction to pain processing and the biopsychosocial model of pain, emphasizing the relationship between stress, emotional well-being, and pain in the military workforce. We review personal and organizational risk and protective factors for pain, such as post-traumatic stress disorder, optimism, perceived organizational support, and job strain. Further, we discuss the potential adverse impact of pain on organizational outcomes, the rise of POM in military personnel, and risk factors for POM in civilian and military populations. Lastly, we propose potential organizational interventions to mitigate pain and provide the future directions for work, stress, and pain research.