Search results

The purpose of this paper is to provide an overview of the recent research on the interaction between flight mechanics and sensory/control systems in flies. It furthermore, explores the application to biomimetic micro‐air vehicles (MAVs).

A review of recent literature on flight in flies is given first, whereafter two biomimetic case studies are discussed; the optic flow sensor developed by a French team and the micro‐mechanical flying insect project at the University of Berkeley.

The paper discusses the many areas where biological knowledge on flight in flies can be used by designers of MAVs.

Fully autonomous MAVs, inspired by insect flight, could be useful in a wide range of areas including search‐and‐rescue, surveillance and for military purposes.

The paper gives an up to date overview of dipteran flight behaviour and points to ways in which this knowledge can be applied to MAVs. The paper should thus be useful for biologists wishing to collaborate with engineers as well as for engineers and sensor designers seeking inspiration from nature.

This study assesses distress in the lives of farming population in Ghana's northern interior. Whereas recent studies addressing mental health in Africa produce evidentially sound analyses of the correlated role of food and water insecurity, this study engages with how and why worries over educational costs feature so prominently in a measure of psychosocial well-being. While it is significant that education identifiably figures in escalating the experience with distress, my contention is that what is more important is putting that escalation into the context of why. I use Narotzky and Besnier's framework for understanding the economy as the interactions between crisis, value, and hope to situate a mixed methods study concerned with how distress is proximately shaped by the interactive socioeconomic features of daily life (paying school fees, buying food, cultivating maize, etc.) but ultimately shaped by structural features of the political economy that direct people's objectives amid chronic crisis. My proposition is that because education is where value resides, it is a primary vehicle by which people are acting in crisis in a hopeful manner. In this way, this study leverages the tools of economic anthropology within debates about how to best assess the ways in which health and illness are shaped by socioeconomic realms.

Drawing upon recent interests in Michel Foucault’s anti-essentialist conception of the state, I provide an analysis of state power in colonial slave societies that is attentive to the ongoing processes of “statification” and governmentalization of the state. This approach represents an alternative to classic state theory, which seems inadequate to describe the diverse political context of Caribbean colonial slave societies.

I apply the Foucauldian conception of the state to the empirical case of the Danish West Indies in the second half of the 18th century. Here, I focus on the problem of public order and its formation in relation to growing concerns over general economic, social, demographic, and political risks that the institution of slavery posed to colonial society. I argue that the slave laws of the 18th century can be seen as a governmental strategy to manage the risks of slavery by constituting a public order that would be subject to policing by the state. I also argue, however, that the specific circumstances of colonial slavery shaped the regulative practices toward the necessities of a flexible, adjustable, responsive government. I suggest that this should be interpreted as a governmental strategy calibrated to the realities of the specificities of colonial rule, rather than simply a reflection of incoherence and incompetence on the part of colonial authorities. The larger argument is that actual state practices have to be seen as results of problems of government in a given context, and as a function of the dynamic and reciprocal processes of government.

The purpose of this paper is to examine the effects of learning organization culture (LOC), learning goal orientation (LGO) and psychological empowerment (PsyEmp) on employee engagement, focusing on the mediating role of each dimension of PsyEmp (meaning, competence, self-determination and impact).

Individual perceptions of 329 employees in 9 South Korean for-profit companies were obtained by a cross-sectional survey. Construct validity of each measurement model was examined using confirmatory factor analysis, and the hypothesized structural model was tested by structural equation modeling. Bootstrap analyses were used for testing mediation effects of PsyEmp.

The authors found that PsyEmp had a significant effect on job engagement, and that LOC and LGO significantly predicted the level of PsyEmp and engagement. The four dimensions of PsyEmp partially mediated the relationship between the two predictors (i.e. LOC and LGO) and job engagement. LGO had a stronger effect than LOC on both PsyEmp and job engagement.

Employees who are high in LGO and perceive that an organization provides opportunities for continuous learning with supportive leadership are more likely to experience improved meaning in their work, competence in their knowledge and skills, and foster self-determination with respect to their personal impact on their work and organization. These important facets of PsyEmp that promote employee engagement should be considered by human resource and OD professionals when recommending workplace changes to improve organizational effectiveness and sustainability.

This study complements the trend to use employee engagement as a proxy for understanding both individual and organizational performance by investigating the relationships among LOC, goal orientation, empowerment and engagement.

The purpose of this paper is to acquaint a wide audience of readers with some of the unique remote sensing and navigation capabilities of animals.

Biomimetic comparison of remote sensors evolved by animals and sensors designed by man. The study and comparison includes thermal infrared sensors used by snakes, echolocation used by bats and dolphins, and navigation methods used by birds. Countermeasures used by prey to avoid capture are also considered.

Some animals have remote sensing and navigation capabilities that are considerably more efficient than those provided by the human body or designed by man.

Sensor designers may be encouraged to use the biometic approach in the design of new sensors.

The paper provides a better understanding of animal behaviour, especially their unique abilities to remotely sense, echolocate and navigate with high accuracy over considerable distances.

The paper presents a comparison of remote sensors used by animals with those developed by humans. Remote sensor designers can learn to improve their sensor designs by studying animal sensors within a biomimetic framework.

Three Coupled Model Intercomparison Project Phase 5 models involved in the G4 experiment of the Geoengineering Model Inter-comparison Project (GeoMIP) project were used to investigate the impact of stratospheric aerosol injection (SAI) on the mean surface air temperature and precipitation extremes in Africa.

This impact was examined under G4 and Representative Concentration Pathway (RCP) 4.5 scenarios on the total precipitation, the number of rainy days (RR1) and of days with heavy rainfall (R20 mm), the rainfall intensity (SDII), the maximum length of consecutive wet (CWD) and dry (CDD) days and on the maximum rainfall in five consecutive days (Rx5day) across four regions: Western Africa (WAF), Eastern Africa (EAF), Northern Africa and Southern Africa (SAF).

During the 50 years (2020–2069) of SAI, mean continental warming is −0.40°C lower in G4 than under RCP4.5. During the post-injection period (2070–2090), the temperature continues to increase, but at a lower rate (−0.19°C) than in RCP4.5. During SAI, annual rainfall in G4 is significantly greater than in RCP4.5 over the high latitudes (especially over SAF) and lower over the tropics. The termination of SAI leads to a significant increase of rainfall over Sahel and EAF and a decrease over SAF and Guinea Coast (WAF).

Compared to RCP4.5, SAI will contribute to reducing significantly regional warming but with a significant decrease of rainfall in the tropics where rainfed agriculture account for a large part of the economies. After the SAI period, the risk of drought over the extratropical regions (especially in SAF) will be mitigated, while the risk of floods will be exacerbated in the Central Sahel.

To meet the Paris Agreement, African countries will implement mitigation measures to contribute to keep the surface air temperature below 2°C. Geoengineering with SAI is suggested as an option to meet this challenge, but its implication on the African climate system needs a deep investigation in the aim to understand the impacts on temperature and precipitation extremes. To the best of the authors’ knowledge, this study is the first to investigate the potential impact of SAI using the G4 experiment of GeoMIP on temperature and precipitation extremes of the African continent.

The aim of the article is to define the way of understanding of agile in enterprises, to verify the factors limiting agility implementation, as well as to understand what the expectations of enterprise management towards agile implementation are.

The article uses both literature studies and empirical research. The research was conducted in 2019 in 152 companies located in Luxemburg, Croatia and Poland, which have implemented an agile approach to management.

In most of the surveyed organisations, agile is understood as a methodology for creating projects or applications. The most common barriers to implementing agile in the surveyed enterprises are culture too deeply rooted in traditional methodologies and the lack of funds to introduce transformations. Growth in productivity and competitiveness and reducing delivery time stand out among the most common expectations of the management of the surveyed enterprises.

The article is in line with the idea of analysing the key factors of a successful agile implementation, which can be a guideline for an enterprise to manage the adoption of agility. The article utilises original research tools, provides comparisons between countries and presents implications for practitioners and researchers.

This study investigates antecedents determining the inclination to engage in future environmental entrepreneurial activities. Building on passion research and social cognitive theory, the authors explore the role of environmental passion for environmental entrepreneurial intention, drawing attention to the mediating role of environmental self-efficacy.

A regression-based path analysis for mediation to test the developed hypotheses on a sample of 139 young individuals is applied.

The results demonstrate a significant positive effect of environmental passion on environmental entrepreneurial intention. The mediation analysis shows a positive direct and indirect effect of passion on intention, concluding that self-efficacy is a partial mediator. The results further suggest that environmental entrepreneurial intention is related to gender. In contrast, covariates like age, entrepreneurial exposure and entrepreneurship education have no significant effect.

The results have implications for practitioners and policymakers who aim to further entrepreneurship for environmental sustainability. It underlines the need to take emotional antecedents seriously, suggests policy for creative and interdisciplinary education with respect to its challenges and emphasizes the roles of teachers in fostering passion.

The results provide a deeper contextualized understanding of passion, self-efficacy and intention in environmental entrepreneurship. These results offer an original perspective of entrepreneurship as a conduit to channel energy, concerns and passionate interests in the natural environment. The study presents theoretical implications for passion theory by extending sources of passion and clarifying the direction of self-efficacy in entrepreneurship.