Overt choice

We introduce and study the notion of overt choice for countably-based spaces and for CoPolish spaces. Overt choice is the task of producing a point in a closed set specified by what open sets intersect it. We show that the question of whether overt choice is continuous for a given space is related to topological completeness notions such as the Choquet-property; and to whether variants of Michael’s selection theorem hold for that space. For spaces where overt choice is discontinuous it is interesting to explore the resulting Weihrauch degrees, which in turn are related to whether or not the space is Fréchet–Urysohn

An overt chemical protective garment reduces thermal strain compared with a covert garment in warm-wet but not hot-dry environments

© 2017 The Authors. Published by Frontiers Media. This is an open access article available under a Creative Commons licence. The published version can be accessed at the following link on the publisher’s website: https://doi.org/10.3389/fphys.2017.00913© 2017 Maley, Costello, Borg, Bach, Hunt and Stewart. Objectives: A commercial chemical, biological, radiological and nuclear (CBRN) protective covert garment has recently been developed with the aim of reducing thermal strain. A covert CBRN protective layer can be worn under other clothing, with equipment added for full chemical protection when needed. However, it is unknown whether the covert garment offers any alleviation to thermal strain during work compared with a traditional overt ensemble. Therefore, the aim of this study was to compare thermal strain and work tolerance times during work in an overt and covert ensemble offering the same level of CBRN protection. Methods: Eleven male participants wore an overt (OVERT) or covert (COVERT) CBRN ensemble and walked (4 km·h-1, 1% grade) for a maximum of 120 min in either a wet bulb globe temperature [WBGT] of 21, 30, or 37°C (Neutral, WarmWet and HotDry, respectively). The trials were ceased if the participants' gastrointestinal temperature reached 39°C, heart rate reached 90% of maximum, walking time reached 120 min or due to self-termination. Results: All participants completed 120 min of walking in Neutral. Work tolerance time was greater in OVERT compared with COVERT in WarmWet (P 0.05). Conclusion: Those dressed in OVERT experienced lower thermal strain and longer work tolerance times compared with COVERT in a warm-wet environment. However, COVERT may be an optimal choice in a hot-dry environment. These findings have practical implications for those making decisions on the choice of CBRN ensemble to be used during work.This project is financially supported by the Australian Government, managed by the National Security Science and Technology Centre within the Defence Science and Technology Organization, and the US Government through the Technical Support Working Group within the Combating Terrorism Technical Support Office.Published versio

Behavioural models and spatial planning : some methodological considerations and empirical tests

This paper is concerned with the relevance of various geographic models of spatial shopping and residential choice behaviour to physical planning. It is argued that models relying on areal aggregation and overt spatial interaction patterns generally do not satisfy a number of methodological requirements considered extremely relevant in an applied context. In addition, it is argued that behavioural models provide a potentially more valuable approach for predicting consumer response to policy decisions with regard to spatial structure. Empirical evidence substantiating the claim that consumer evaluations bear some systematic relationship with objective attributes of spatial alternatives and overt choice behaviour is provided in the context of spatial shopping behaviour and residential choice behaviour

The Gender Pay Differential: Choice, Tradition, or Overt Discrimination?

No one disputes that a male-female gender wage differential favoring men exists. This study seeks to unearth not only the sources of this differential but also the relative degrees to which the various sources impact the differential. The theories proposed by current literature suggest three principal causes: differences in human capital, crowding discrimination, and other forms of discrimination. This study estimates separate equations for men and women and then uses the regression results to decompose the gender wage differential into the three aforementioned components. We find, after isolating the effects of differences in individual human capital and choice characteristics as well as differences due to crowding, the residual surprisingly accounts for the largest proportion of the gender wage gap. Because the residual is so large, we believe that basic discrimination models must still be necessary and useful. Moreover, when one considers that the human capital differences that do exist may be reflecting feedback effects, the justification for combating societal stereotyping of gender roles becomes even stronger, to promote not only equity but also efficiency in today\u27s labor market

Dressing and addressing the mental patient: the uses of clothing in the admission, care and employment of residents in English provincial mental hospitals, c. 1860–1960

Scholars of insanity and its historical antecedents have paid very little attention to personal and institutional clothing. Such dress, distributed to patients in mental institutions, has always been inscribed with the conflicting narratives of the period in which it was made and worn. The language of civil and medical authority is more evident than personal choice in the shape and address of the attire. This article examines clothing worn by patients in three Devon mental hospitals during the century before 1960. We consider the ways in which institutional clothing formed part of a hospital regimen of overt control, as well as suiting considerations of economy and employment that figured in these institutions

Third person pronoun forms in Estonian in the light of centering theory

This paper explains the distinctions between the Estonian 3rd person overt pronoun and the zero person marker in spoken narratives. As both forms express the most salient entities in discourse, the saliency criterion cannot distinguish them. The Centering Theory is used to explore if the overt pronoun and zero have different effects on discourse coherence, i.e. whether there is a difference between transition types relating to zero and those signaling the overt pronoun. Additionally, factors such as grammatical role, case and clause type affecting the choice of pronominal forms are studied to supplement results from the Centering analysis. It is hypothesized that the use of the zero form connects to the CONTINUE transition, while the overt pronoun combines with other Centering- based transition types as well. Furthermore, results show that the zero form is more restricted in its usage contexts and signals mainly nominative subjects in main clauses, while the overt form can appear more widely in different linguistic environments

Systemic effector conceptual model in groupware implementation

Network software systems and groupware within organizations differ from other information technologies, requiring individuals to 'design' their own use. Users and groups can choose how to engage with these systems (Hassall, 1998), and use is dependent upon existing technological framing (Orlikowski, 1992). Groupware provides opportunities to study interaction between technological and organizational potentials. The action and structure duality of structuration theory (Giddens, 1984) points to the need for systemic understandings. Moreover, deconstructive schemes (e.g. Dudley and Hassall 1995,1996) demonstrate a plurality of overt and ulterior motivations in use. The Systemic Effector Model has been developed based upon longitudinal research in groupware implementation. This abstracted perspective relates choice of facility and design of action to important motivators at the individual and systemic levels. The genesis and explanatory power of the model is explored through survey and case study data

The connected Vietoris powerlocale

The connected Vietoris powerlocale is defined as a strong monad Vc on the category of locales. VcX is a sublocale of Johnstone's Vietoris powerlocale VX, a localic analogue of the Vietoris hyperspace, and its points correspond to the weakly semifitted sublocales of X that are “strongly connected”. A product map ×:VcX×VcY→Vc(X×Y) shows that the product of two strongly connected sublocales is strongly connected. If X is locally connected then VcX is overt. For the localic completion of a generalized metric space Y, the points of are certain Cauchy filters of formal balls for the finite power set with respect to a Vietoris metric. \ud Application to the point-free real line gives a choice-free constructive version of the Intermediate Value Theorem and Rolle's Theorem. \ud \ud The work is topos-valid (assuming natural numbers object). Vc is a geometric constructio

I USED TO BE A RAINBOW

In his artworks, Earl McBride embraces similarly simplified expectations., though not without first coaxing-sometimes wrestling-them into submission. His use of materials, expressionist mark-making, and choice of colors are all strong compositional elements that make direct refrence to a personal narrative without restoring to overt, didactic representations