Behavior of large-scale rectangular columns confined with FRP composites

This paper focuses on axially loaded, large-scale rectangular RC columns confined with fiber-reinforced polymer (FRP) wrapping. Experimental tests are conducted to obtain the stress-strain response and ultimate load for three field-size columns having different aspect ratios and/or corner radii. Effective transverse FRP failure strain and the effect of increasing confining action on the stress-strain behavior are examined. Existing strength models, the majority of which were developed for small-scale specimens, are applied to predict the structural response. Since some of them fail to adequately characterize the test data and others are complex and require significant calculation, a simple design-oriented model is developed. The new model is based on the confinement effectiveness coefficient, an aspect ratio coefficient, and a corner radius coefficient. It accurately predicts the axial ultimate strength of the large-scale columns at hand and, when applied to the small-scale columns studied by other investigators, produces reasonable results

Effectiveness of Nitrate Policy in Flanders (1990-2003): Modular Modelling and Response Analysis

The impact of current nitrate policy measures in Flanders is estimated. A modular modelling system has been developed for comparing response and pressure indicators and for decomposing the response impact of policy measures. Compared to 1990, the internalised manure surplus is reduced to zero, whereas the distance to target of the soil surface balance to the water quality standard dropped only with 58%. Source-linked and sink-related measures each account for about the half of the manure surplus reduction. The impact of abatement technologies is minor. The modular approach helps to unravel the discrepancy between pressure and response and to propose policy alternatives.abatement technology, DPSIR scheme, nitrogen pollution reduction, Agricultural and Food Policy, B41, C51, H21, K32,

Expropriation of minority shareholders : evidence from East Asia

As many East Asian countries plunged into economic decline, the structure of concentrated ownership and associated corporate governance, along with weak corporate performance, have been blamed for the crisis. There is little empirical evidence, however, of the nature of ownership structures in East Asia and their relationship to corporate performance in the typical East Asian environment (where inefficient judicial systems, and weak property and shareholder rights are common). The authors examine evidence of the expropriation of minority shareholders for 2,658 corporations in nine East Asian countries in 1996. They distinguish control from cash-flow rights. They also distinguish between various types of ultimate owners, including family, state, widely held corporations, and widely held financial institutions. Higher cash-flow rights are associated with higher market values, consistent with Jensen and Meckling (1976). In contrast, deviations of control from cash-flow rights - through the use of dual-class shares, pyramiding, and cross-holdings - are associated with lower market values. This is especially true for corporations under family control and, in Japan, under the control of widely held financial institutions. They conclude that the risk of expropriation is the major principal-agent problem for large corporations, as suggested by La Porta and colleagues (1999). The degree to which certain ownership structures are associated with expropriation depends on country-specific circumstances. These may include the quality of banking systems, the legal and judicial protection of individual shareholders, and the degree of financial disclosures required.Small Scale Enterprise,Fiscal&Monetary Policy,Labor Policies,Economic Theory&Research,International Terrorism&Counterterrorism,Private Participation in Infrastructure,Microfinance,Economic Theory&Research,Fiscal&Monetary Policy,Small Scale Enterprise

Similarity and bisimilarity notions appropriate for characterizing indistinguishability in fragments of the calculus of relations

Motivated by applications in databases, this paper considers various fragments of the calculus of binary relations. The fragments are obtained by leaving out, or keeping in, some of the standard operators, along with some derived operators such as set difference, projection, coprojection, and residuation. For each considered fragment, a characterization is obtained for when two given binary relational structures are indistinguishable by expressions in that fragment. The characterizations are based on appropriately adapted notions of simulation and bisimulation.Comment: 36 pages, Journal of Logic and Computation 201

Trends in Contemporary Art Discourse: Using Topic Models to Analyze 25 years of Professional Art Criticism

In this article, we use topic modeling to systematically explore topics discussed in contemporary art criticism. Analyzing 6965 articles published between 1991 and 2015 in Frieze, a leading art magazine, we find a plurality of topics characterizing professional discourse on contemporary art. Not surprisingly, media- or genre-specific topics such as film/cinema, photography, sculpture/installations, etc. emerge. Interestingly, extra-artistic topics also characterize contemporary art criticism: there is room for articles on new digital technology and on art and philosophy; there is also growing interest in the relationship between art and society. Our analysis shows that despite evolutions in the field of contemporary art – such as the ‘social turn’, in which contemporary art starts paying more attention to social forms and content – the prevalence of certain topics in contemporary art criticism has barely changed over the past 25 years. With this article, we demonstrate the unique value of topic modeling for cultural sociology: it is both a powerful computational technique to generate a bird’s-eye view of a huge text corpus and a heuristic device that locates key texts for further close reading

Relative Expressive Power of Navigational Querying on Graphs

Motivated by both established and new applications, we study navigational query languages for graphs (binary relations). The simplest language has only the two operators union and composition, together with the identity relation. We make more powerful languages by adding any of the following operators: intersection; set difference; projection; coprojection; converse; and the diversity relation. All these operators map binary relations to binary relations. We compare the expressive power of all resulting languages. We do this not only for general path queries (queries where the result may be any binary relation) but also for boolean or yes/no queries (expressed by the nonemptiness of an expression). For both cases, we present the complete Hasse diagram of relative expressiveness. In particular the Hasse diagram for boolean queries contains some nontrivial separations and a few surprising collapses.Comment: An extended abstract announcing the results of this paper was presented at the 14th International Conference on Database Theory, Uppsala, Sweden, March 201

Ethical leadership in times of change: the role of change commitment and change information for employees’ dysfunctional resistance

© 2020, Emerald Publishing Limited. Purpose: In the present study, the authors draw on social exchange theory to argue that ethical leaders offer positive exchanges in times of change and thereby encourage employees’ change commitment, which subsequently reduces their dysfunctional resistance. Drawing on uncertainty management theory, the authors further hypothesize that employees’ perception of change information (i.e. a change-specific context) not only moderates the negative relationship between employees’ change commitment and dysfunctional resistance but also the indirect relationship between ethical leadership and dysfunctional resistance via change commitment. Design/methodology/approach: The authors conducted a two-source cross-sectional survey involving 144 matched pairs of employees and coworkers from a range of organizations. Findings: Employees’ change commitment mediates the relationship between ethical leadership and their dysfunctional resistance. Furthermore, employees’ perception of change information not only moderates the relationship between change commitment and dysfunctional resistance but, more importantly, also the indirect effect between ethical leadership and dysfunctional resistance via change commitment. More specifically, the effect of change commitment on employees’ dysfunctional resistance as well as the indirect effect of ethical leadership on employees’ dysfunctional resistance through change commitment are stronger when there is little change information. Research limitations/implications: Ethical leadership is able to reduce employees’ dysfunctional resistance, particularly when employees have limited information regarding the change. Originality/value: This study demonstrates how change commitment acts as a mediator and change information serves as a moderator in the ethical leadership–dysfunctional resistance relationship in the time of organizational change