The biomechanics of the locust ovipositor valves : a unique digging apparatus

The female locust has a unique mechanism for digging in order to deposit its eggs deep in the ground. It utilizes two pairs of sclerotized valves to displace the granular matter, while extending its abdomen as it propagates underground. This ensures optimal conditions for the eggs to incubate, and provides them with protection from predators. Here, two major axes of operation of the digging valves are identified, one in parallel to the propagation direction of the ovipositor, and one perpendicular to it. The direction-dependent biomechanics of the locust major, dorsal digging valves are quantified and analyzed, under forces in the physiological range and beyond, considering hydration level, as well as the females’ age, or sexual maturation state. Our findings reveal that the responses of the valves to compression forces in the specific directions change upon sexual maturation to follow their function, and depend on environmental conditions. Namely, in the physiological force range, the valves are resistant to mechanical failure. In addition, mature females, which lay eggs, have stiffer valves, up to roughly nineteen times the stiffness of the pre-mature locusts. The valves are stiffer in the major working direction, corresponding to soil shuffling and compression, compared to the direction of propagation. Hydration of the valves reduces their stiffness but increases their resilience against failure. These findings provide mechanical and materials guidelines for the design of novel non-drilling excavating tools, including 3D-printed anisotropic materials based on composites.Statement of significance The female locust lay its eggs underground in order to protect them from predators and to provide them with optimal conditions for hatching. In order to dig into the ground, it uses two pairs of valves: The ventral pair is plugged as a wedge, while the dorsal pair performs the digging of the oviposition tunnel. We study the mechanical response of the digging valves, depending on age, hydration level and direction of operation. Our findings show that during the course of roughly two weeks in the life of the adult female, the digging valves become up to nineteen-fold stiffer against failure, in order to fulfill their function as diggers. While hydration reduces the stiffness, it also increases the resilience against failure and renders the valves unbreakable within the estimated physiological force range and beyond. The digging valves are consistently stiffer in the digging direction than in the perpendicular direction, implying on their form-follows-function design.Competing Interest StatementThe authors have declared no competing interest

Seasonality of Overseas Tourism Demand in Scotland: A Regional Analysis

This paper examines patterns of seasonality in international tourism to the regions of Scotland. Quarterly numbers of overnight stays are disaggregated by trip purpose. Seasonality in vacation tourism to Scotland is shown to be defined by more than a simple rural–urban division. Overseas visiting friends and relatives (VFR) tourism is largely an urban phenomenon and is consequently less seasonal than vacation tourism. Lower seasonal concentration of VFR tourism is not uniform across the regions. Although levels of seasonal intensity of business tourism to the three principal cities of Scotland are approximately the same, there are noticeable variations over time

A Theory of Organization-EHR Affordance Actualization

While organizations implement information technology (IT) to effect change, current theories of IT-associated organizational change pay insufficient attention to the change goals, the role of IT in organizational change, and the multilevel nature of change processes. We take a fresh look at IT-associated organizational change using grounded theory methods. Our longitudinal study of an electronic health record (EHR) system implementation in a multi-site medical group found user behaviors that did not fit well with existing theories. Instead, we found that they fit better with the concept of affordances from ecological psychology. In developing our affordance-based theory of IT-associated organizational change from our field data, we discovered three gaps in the affordance literature; namely, the lack of theory for (1) the process of actualizing an affordance’s potential, (2) affordances in an organizational context, and (3) bundles of interrelated affordances. This paper extends the theory of affordances to handle these three gaps and, in doing so, develops a mid-range theory for EHR-associated organizational change in a healthcare organization. While the resulting theory is specific to EHR implementations, it offers a template for other mid-range affordance-actualization theories and a more general affordance-actualization lens. Our affordance-actualization lens considers the materiality of the IT artifact, the non-deterministic process by which IT leads to organizational effects, the multilevel nature of IT-associated change processes, and the intentionality of managers and users as agents of change, and thus addresses important criteria for theories of IT effects in organizations. The paper also provides practical guidance for implementing EHR systems and other organizational systems

Learning To Be Affected: Social suffering and total pain at life’s borders.

The practice of Live Sociology in situations of pain and suffering is the author’s focus. An outline of the challenges of understanding pain is followed by a discussion of Bourdieu’s ‘social suffering’ (1999) and the palliative care philosophy of ‘total pain’. Using examples from qualitative research on disadvantaged dying migrants in the UK, attention is given to the methods that are improvised by dying people and care practitioners in attempts to bridge intersubjective divides, where the causes and routes of pain can be ontologically and temporally indeterminate and/or withdrawn. The paper contends that these latter phenomena are the incitement for the inventive bridging and performative work of care and Live Sociological methods, both of which are concerned with opposing suffering. Drawing from the ontology of total pain, I highlight the importance of (i) an engagement with a range of materials out of which attempts at intersubjective bridging can be produced, and which exceed the social, the material, and the temporally linear; and (ii) an empirical sensibility that is hospitable to the inaccessible and non-relational

The Cross-Cultural Moderators of the Influence of Emotional Intelligence on Organizational Citizenship Behavior and Counterproductive Work Behavior

This meta‐analysis found that the emotional intelligence–organizational citizenship behavior relationship is stronger in long‐term oriented and restraint cultures. However, this relationship does not differ between individualistic and collectivistic cultures, masculine and feminine cultures, high uncertainty avoidance and low uncertainty avoidance cultures, and high power distance and low power distance cultures. The emotional intelligence–counterproductive work behavior relationship is stronger in collectivistic, feminine, high uncertainty avoidance, high power distance, long‐term oriented, and restraint cultures. Emotional intelligence–organizational citizenship behavior/counterproductive work behavior relationships are mediated by both state positive affect and state negative affect. Human resource development professionals from cultures where the effects of emotional intelligence are stronger are especially recommended to hire emotionally intelligent employees and/or provide emotional intelligence training to stimulate organizational citizenship behavior and to restrain counterproductive work behavior. Although there are important cross‐cultural differences, emotional intelligence universally encourages organizational citizenship behavior and almost universally diminishes counterproductive work behavior across cultures