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The National Science Foundation (NSF) Research Experience for Undergraduates (REU) programs are traditionally delivered in-person and full-time (40 h per week) for 10 weeks during the summer. However, this type of format has the potential to limit broader student participation. This study aims to compare learning assessment data between a traditional NSF REU (10 weeks of summer, full-time, in-person) to an alternative NSF REU delivered virtually, part-time and over 10 months as a result of the coronavirus disease 2019 (COVID-19) pandemic.

A retrospective pre-then-post survey was completed to assess perceived learning gains for each REU program. Three learning gains categories were assessed: entrepreneurial competencies, career goals and research skill development. T-tests were used to evaluate a difference in means between pre and post.

Findings show the greatest quantity of learning gains within the alternative program delivery. Moreover, a larger quantity of learning gains was perceived within the first semester of the alternative program delivery compared to the second semester.

The authors propose the NSF should be intentional about trying new approaches to REU programs delivery, including duration and format, as a way to broaden participation in engineering.

This study is original in that it is the first of its kind to assess an alternative REU program delivery (allowed only because of the COVID-19 pandemic) in comparison to traditional REU program delivery.

The relationship between risk and return has been widely analysed in the scope of listed companies. However the present literature leaves uncovered an important study area with regards to privately held firms. In order to cover this gap, this study analyses the risk-return trade-off in the context of private enterprises. Furthermore, the authors incorporate the contingent effect of being a family firm on the abovementioned relationship.

Using information from the SABI (Sistema de Análisis de Balances Ibéricos) database, a sample of 2,297 private manufacturing firms were analysed for the period of 2009–2016. So as to ascertain the proposed hypotheses, dynamic panel data methodology was applied. Specifically, the authors estimated the two-step general method of moments (GMM).

The obtained findings reveal that, according to prospect theory arguments, privately held firms adopt a conservative attitude toward risk when results are higher than a target level, while becoming risk seeking when results are lower than a target level. Moreover, the fact of being a family firm softens the risk-return relationship both when performance is above the target level and also when firms find themselves in the lowest performing case.

This article is, to the best of the authors' knowledge, one of the first studies dealing with the risk-return relationship in a privately held firm context. Moreover, the inclusion of being a family firm as a contingent factor in the abovementioned link is a complete novelty.

La relación riesgo-rentabilidad ha sido ampliamente analizada en el ámbito de las empresas cotizadas. Sin embargo, la literatura existente deja al descubierto una importante área de estudio en relación con las empresas no cotizadas. Para cubrir esta brecha, el presente estudio analiza el binomio riesgo-rentabilidad en el contexto de empresas privadas. Adicionalmente, incorporamos el efecto contingente de ser una empresa familiar sobre esta relación.

Utilizando información de la base de datos SABI (Sistema de Análisis de Balances Ibéricos) se analizó una muestra de 2.297 empresas manufactureras privadas para el período 2009–2016. Para comprobar las hipótesis propuestas se aplicó la metodología de datos de panel, específicamente, utilizamos el Método de los Momentos Generalizado (GMM).

Los resultados muestran que, de acuerdo con la Teoría Prospectiva, las empresas no cotizadas presentan una mayor aversión al riesgo cuando su nivel de rentabilidad es superior al valor de referencia establecido, mientras que presentan una mayor propensión al riesgo cuando su rentabilidad es inferior al valor de referencia. Además, el hecho de ser una empresa familiar suaviza la relación riesgo-rentabilidad en ambos escenarios.

Este es uno de los primeros estudios en abordar la relación riesgo-rentabilidad en el contexto de empresas no cotizadas. Además, la inclusión de ser una empresa familiar como factor contingente es completamente novedosa.

The roofs of houses located at middle latitudes receive significant solar radiation useful to supply their own energy demands and to feed back into the urban electricity network. However, solar panels should be properly integrated into roofs. This study analyzed roof geometry and integrated solar performance of Photovoltaic, thermal-photovoltaic, and hybrid solar collection technologies on dwelling cases selected from a sample of recent housing developments in Concepción, Chile. Hour-by-hour energy generation estimates and comparisons with demand levels were calculated for representative days during seasons of maximum, minimum as well as mid-season. These estimates took into account the roof tilt and orientation effects also. Trnsys@ software was used to determine electricity supply and F-Chart tool for thermal energy supply. The results show five times more panels can be placed on the largest and most regular shaped roof sections than on those with the smallest and most irregular shapes. The house model with the largest roof section can provide up to six times more energy than the model with the smallest second roof section in different seasons and systems. This paper thus provides new findings on the performance of solar technologies when related to home energy demands and roof geometry.

The purpose of this paper is to introduce a new perspective on ambidextrous innovation orientation looking at how the current digital transformation is accepted in the fashion industry in Italy. Precisely, the objective of the paper is to test whether the use of social media platforms positively influences ambidextrous innovation orientation in fashion companies.

Empirical quantitative research was carried out on a sample of 853 small- to medium-sized enterprises (SMEs) operating in the fashion industry in Italy. Using a logistic regression methodology, four hypotheses were tested to verify the correlation of four dimensions of social media platforms with an ambidextrous innovation orientation among fashion firms.

The four hypotheses were validated: the structural dimension, the relational behaviour dimension, the cognitive dimension and knowledge transfer practices of social media platforms were proven to positively influence ambidextrous innovation orientation in fashion firms.

Though this is one of the few research studies that offers a quantitative analysis in this field, it could be further developed, for instance by extending the sample of firms to SMEs operating in other countries or by comparing multinationals with SMEs.

This paper provides an original contribution to studies on the use of social media to promote ambidexterity in firms, which has only been studied to a limited extent in the extant literature. From this perspective, the originality of the study is further strengthened by the unique context of analysis, namely, the fashion industry in Italy.

This study analyzes the mediating effect of emotional exhaustion between certain job demands (workload, role conflict, and influence at work) and employees' work attitudes (affective commitment and turnover intention) in public healthcare. Furthermore, it analyzes the moderating effect of possibilities for development and the degree of freedom at work between the above-mentioned job demands and emotional exhaustion.

A total of 512 healthcare professionals participated in the study. The data were analyzed using structural equation modeling and a hierarchical multiple regression analysis.

The results show that emotional exhaustion fully mediates the relationship between job demands (workload and role conflict) and work attitudes (affective commitment and turnover intention). Moreover, the possibilities for development and degree of freedom at work moderate the relationship between role conflict and emotional exhaustion.

Strategies should be designed to prevent employees from becoming emotionally exhausted and lead them to feel more motivated, which results in a more effective public healthcare service.

This study stresses the importance of analyzing the role of emotional exhaustion in the public healthcare context. It demonstrates the mediating role of this variable between several antecedents and consequences, and it analyzes whether other relevant variables can moderate the negative effects of emotional exhaustion.

This study aims to investigate the factors that affect the likelihood of formalizing informal sector activities in 13 Sub-Saharan African countries, using World Bank enterprise survey data collected between the periods 2009 and 2018. Notwithstanding the great contribution of the informal economy in Africa, developing countries may stand to gain more if they make inroads in formalizing the informal sector.

Since the dependent variable is binary taking the value of one if the firm is willing to formalize and zero otherwise, the study will employ a discrete choice probit model.

Results inter alia show that firms that are more likely to formalize are young, owned by individuals with high levels of education and, have registered before. Governments should therefore target firms that are young and provide them with information about the benefits of registration, and if these firms are owned by experienced and educated individuals, the likelihood for them to register would be high.

The study uses cross sectional data and therefore cannot capture time variant factors affecting the probability to register and also cannot correct effectively for endogeneity.

Governments should therefore target firms that are young and provide them with as much information as possible about the benefits of registration, and if these firms are owned by experienced and educated individuals, the likelihood to convince them to register would be high. They should also reduce the cost of registration so as to improve net benefits in line with the rational exit view.

Formalizing informal activities will help improve the performance of these firms, reduce vulnerable employment as well as crime, poverty and inequality. Providing decent operating and working conditions to informal players will reduce social and political unrest.

The African continent is home to many informal firms accounting for roughly 55% of economic activity with 90% of workers eking out a living in a sector that does not respect worker rights, provide decent working conditions and where changes in growth have done little to reduce its size. Regulatory reforms have also been implemented resulting in the number of start-up registration procedures falling from 11 in 2003 to seven in 2019. The uniqueness of Sub Saharan Africa in terms of entrepreneurial culture, political, institutional and economic conditions as well as lack of consensus in the extant empirical literature make this study pertinent.

Chapter 1 introduces the science of psychophysics to establish the initial condition and expectations for the work. The chapter begins with an overview of psychophysics, its limitations, and its measurement approaches, which are equivalent to the sensation processes. The science of psychophysics is delineated and differentiated from similar fields of study to discriminate it as a science, which is equivalent to the processes of perception. Finally, this information is compiled into a table, which integrates the information into a cognitive model of the nested systems to be discussed (cognition).

In a psychophysical learning system, this chapter establishes the definition of psychophysics, removes irrelevant information from the conceptual framework, and relates the information to future discussions (immediacy), which creates a flow within the learning process.