Leadership and conflict

We model the choice of leaders of groups within society, where leaders influence both the mode of interaction between groups (either peaceful compromise or costly conflict) and the outcome of these interactions. Group members may choose leaders strategically/instrumentally or they may choose leaders expressively. We characterize the equilibria of the instrumental choice model and also argue that leadership elections may overemphasise the role of expressive considerations in the choice of leader, and that this may result in increased conflict between groups

Expressive Political Behaviour: Foundations, Scope and Implications

A growing literature has focussed attention on ‘expressive’ rather than ‘instrumental' behaviour in political settings - particularly voting A common criticism of the expressive idea is that its myriad possibilities make it rather ad hoc and lacking in both predictive and normative bite. We agree that no single clear definition of expressive behaviour has emerged to date, and no detailed foundations of specific expressive motivations have been provided, so that there are rather few specific implications drawn from the analysis of expressive behaviour. In response, we provide a foundational discussion and definition of expressive behaviour that accounts for a range of factors. We also discuss the content of expressive choice distinguishing between moral, social and emotional cases, and relate this more general account to the specific theories of expressive choice in the literature. Finally, we discuss the normative and institutional implications of expressive behaviour.expressive behaviour; identity; moral choice; populism; institutional design

Group formation and competition: instrumental and expressive approaches

We construct models of group formation designed to capture some of the key features of political and social competition. The models draw on the ‘citizen candidate’ approach and allow competition to be modelled as either compromise - where all groups influence outcomes; or conflict - where one group wins the right to dictate. We also consider both instrumental and expressive approaches to understanding group formation, first separately and then in a setting which encompasses both approaches. <br><br> Keywords; group formation, expressive behaviour, conflict, compromise <br><br> ISSN 0966-4246

Expressive political behaviour : foundations, scope and implications

A growing literature has focused attention on ‘expressive’ rather than ‘instrumental’ behaviour in political settings, particularly voting. A common criticism of the expressive idea is that it is ad hoc and lacks both predictive and normative bite. No clear definition of expressive behaviour has gained wide acceptance yet, and no detailed understanding of the range of foundations of specific expressive motivations has emerged. This article provides a foundational discussion and definition of expressive behaviour accounting for a range of factors. The content of expressive choice – distinguishing between identity-based, moral and social cases – is discussed and related to the specific theories of expressive choice in the literature. There is also a discussion of the normative and institutional implications of expressive behaviour

Expressive Political Behaviour : Foundations, Scope and Implications

A growing literature has focussed attention on ‘expressive’ rather than ‘instrumental’ behaviour in political settings - particularly voting A common criticism of the expressive idea is that its myriad possibilities make it rather ad hoc and lacking in both predictive and normative bite. We agree that no single clear definition of expressive behaviour has emerged to date, and no detailed foundations of specific expressive motivations have been provided, so that there are rather few specific implications drawn from the analysis of expressive behaviour. In response, we provide a foundational discussion and definition of expressive behaviour that accounts for a range of factors. We also discuss the content of expressive choice distinguishing between moral, social and emotional cases, and relate this more general account to the specific theories of expressive choice in the literature. Finally, we discuss the normative and institutional implications of expressive behaviour

Solubility and structure of calcium silicate hydrate,”

Abstract The poorly crystalline calcium silicate hydrate (C-S-H) phases that form near room temperature, which include the technically important C-S-H gel phase formed during the hydration of Portland cement, have a broad similarity to the crystalline minerals tobermorite and jennite, but are characterized by extensive atomic imperfections and structural variations at the nanometer scale. Relationships between the aqueous solubility and chemical structure are reported for specimens formed by different preparation methods and with a broad range of compositions. Both new and previously published data show that these phases generate a family of solubility curves in the CaO -SiO 2 -H 2 O system at room temperature. As demonstrated by 29 Si magic-angle spinning (MAS) NMR data and by charge balance calculations, the observed solubility differences arise from systematic variations in Ca/Si ratio, silicate structure, and Ca -OH content. Based on this evidence, the solubility curves are interpreted as representing a spectrum of metastable phases whose structures range from purely tobermorite-like to largely jennitelike. These findings give an improved understanding of the structure of these phases and reconcile some of the discrepancies in the literature regarding the structure of C-S-H at high Ca/Si ratios.

Hysteresis from Multiscale Porosity: Modeling Water Sorption and Shrinkage in Cement Paste

Cement paste has a complex distribution of pores and molecular-scale spaces. This distribution controls the hysteresis of water sorption isotherms and associated bulk dimensional changes (shrinkage). We focus on two locations of evaporable water within the fine structure of pastes, each having unique properties, and we present applied physics models that capture the hysteresis by dividing drying and rewetting into two related regimes based on relative humidity (RH). We show that a continuum model, incorporating a pore-blocking mechanism for desorption and equilibrium thermodynamics for adsorption, explains well the sorption hysteresis for a paste that remains above approximately 20% RH. In addition, we show with molecular models and experiments that water in spaces of ≲1  nm width evaporates below approximately 20% RH but reenters throughout the entire RH range. This water is responsible for a drying shrinkage hysteresis similar to that of clays but opposite in direction to typical mesoporous glass. Combining the models of these two regimes allows the entire drying and rewetting hysteresis to be reproduced accurately and provides parameters to predict the corresponding dimensional changes. The resulting model can improve the engineering predictions of long-term drying shrinkage accounting also for the history dependence of strain induced by hysteresis. Alternative strategies for quantitative analyses of the microstructure of cement paste based on this mesoscale physical model of water content within porous spaces are discussed.Portland Cement AssociationNational Ready Mixed Concrete Association (Research and Education Foundation)Schlumberger Foundatio

Examining the Moral Grey Zone: The Role of Moral Disengagement, Authenticity, and Situational Strength in predicting Unethical Managerial Behaviour

In the business context, there is a broad spectrum of practices that potentially harm others, yet might benefit the organization. We examined the influence of individual and situational differences in predicting (un)ethical behavior in these moral gray zones using an in-basket exercise that included covert moral issues in which managers could give unethical instructions to their followers. Results show that individual differences in moral disengagement directly predicted unethical behavior and functioned as a mediator of the relationship between authenticity and unethical behavior. Furthermore, effects differed in weak compared to strong situations. Study 2, replicated the results from Study 1, developed a direct test of the situational strength hypothesis, and showed that high versus low situation strength moderated the relation of moral disengagement to unethical behavior

Collective choice and individual action: Education policy and social mobility in England

It is recognised that expressive preferences may play a major role in determining voting decisions because the low probability of being decisive in elections undermines standard instrumental reasoning. Expressive and instrumental preferences may deviate and in electoral settings it is more important to make policies expressively appealing. But policies are even more attractive if theycan be made both expressively and instrumentally appealing. This paper studies education policy in England and proposes that the argument for increased state spending in school education is expressively appealing as it appears equitable, but the allocation of students to schools by catchment area is also instrumentally appealing to middle-class families. Allocation to schools by lottery may be expressively but not instrumentally appealing. Cutting education spending and dividing the proceeds between a tax cut to the affluent and a cash transfer to the poor may be instrumentally but not expressively appealing. The effort to provide instrumentally appealing policies with sufficient ethical content to satisfy expressive preferences may lead to inefficiency and distract attention from more serious ethical problems related to the policies