Protecting Long-term Commitment: Legal and Organizational Means

International audienc

The electronic structure of La1−x_{1-x}Srx_{x}MnO3_{3} thin films and its TcT_c dependence as studied by angle-resolved photoemission

We present angle-resolved photoemission spectroscopy results for thin films of the three-dimensional manganese perovskite La$_{1-x}$Sr$_{x}$MnO$_{3}$. We show that the transition temperature ($T_c$) from the paramagnetic insulating to ferromagnetic metallic state is closely related to details of the electronic structure, particularly to the spectral weight at the ${\bf k}$-point, where the sharpest step at the Fermi level was observed. We found that this ${\bf k}$-point is the same for all the samples, despite their different $T_c$. The change of $T_c$ is discussed in terms of kinetic energy optimization. Our ARPES results suggest that the change of the electronic structure for the samples having different transition temperatures is different from the rigid band shift.Comment: Accepted by Journal of Physics: Condensed Matte

Profiling the interface electron gas of LaAlO3/SrTiO3 heterostructures by hard X-ray photoelectron spectroscopy

The conducting interface of LaAlO$_3$/SrTiO$_3$ heterostructures has been studied by hard X-ray photoelectron spectroscopy. From the Ti~2$p$ signal and its angle-dependence we derive that the thickness of the electron gas is much smaller than the probing depth of 4 nm and that the carrier densities vary with increasing number of LaAlO$_3$ overlayers. Our results point to an electronic reconstruction in the LaAlO$_3$ overlayer as the driving mechanism for the conducting interface and corroborate the recent interpretation of the superconducting ground state as being of the Berezinskii-Kosterlitz-Thouless type.Comment: 4 pages, 4 figure

Hard to catch : experimental evidence supports evasive mimicry

Most research on aposematism has focused on chemically defended prey, but the signalling difficulty of capture remains poorly explored. Similar to classical Batesian and Mullerian mimicry related to distastefulness, such 'evasive aposematism' may also lead to convergence in warning colours, known as evasive mimicry. A prime candidate group for evasive mimicry are Adelpha butterflies, which are agile insects and show remarkable colour pattern convergence. We tested the ability of naive blue tits to learn to avoid and generalize Adelpha wing patterns associated with the difficulty of capture and compared their response to that of birds that learned to associate the same wing patterns with distastefulness. Birds learned to avoid all wing patterns tested and generalized their aversion to other prey to some extent, but learning was faster with evasive prey compared to distasteful prey. Our results on generalization agree with longstanding observations of striking convergence in wing colour patterns among Adelpha species, since, in our experiments, perfect mimics of evasive and distasteful models were always protected during generalization and suffered the lowest attack rate. Moreover, generalization on evasive prey was broader compared to that on distasteful prey. Our results suggest that being hard to catch may deter predators at least as effectively as distastefulness. This study provides empirical evidence for evasive mimicry, a potentially widespread but poorly understood form of morphological convergence driven by predator selection.Peer reviewe

Embedded Agency in Institutional Theory: Problem or Paradox

In “Beyond Constraining and Enabling: Toward New Microfoundations in Institutional Theory” Professor Cardinale (2018) seeks to expose and correct “shortcomings” (p.133) in institutional theory’s conceptualization of structure, agency and their relationship. To this end, he theorizes the “different mechanism[s] through which actors are embedded in structure” (p.134). We agree that institutional theory’s microfoundations merit theoretical attention and development. However, we question the premise that the issue of agency in institutional theory is adequately, or even plausibly, formulated as one of “embeddedness”. We also challenge the relevance of Professor Cardinale’s engagement of Husserl to help solve what we argue to be a phantom problem central to his theory

Where constructionism and critical realism converge: interrogating the domain of epistemological relativism

The paper interrogates the status, nature and significance of epistemological relativism as a key element of constructionism and critical realism. It finds that epistemological relativism is espoused by authorities in critical realism and marginalized or displaced in the field of management and organization studies, resulting in forms of analysis that are empirically, but not fully critically, realist. This evaluation prompts reflection on the question of whether, how and with what implications epistemological relativism might be recast at the heart of critical realist studies of management and organization

Madness and Mindfulness

The chapter examines the institutionalization of unreason and the potential role of meditation in disclosing its roots. It is argued that meditative awareness can enable critical reflection on, and transformation of, practices that diminish our rational awareness. Mindfulness may contribute to this awareness, but its lack of an ethical frame renders it vulnerable to narcissistic appropriation and corporate commercialization. Accordingly, mindfulness is limited in disclosure, and counteracting, of the needless perpetuation of suffering associated with ego-building and defensive emotions, as manifest in contemporary expressions of sectarianism and fanaticism. The examination of antidotes to unreason and freedom is accomplished through a series of critical reflections upon the insights generated by Wright Mills’ The Sociological Imagination, Carol Hanisch’s “The Personal is Political,” and Freire’s Pedagogy of the Oppressed. These texts provide complementary commentaries on the development of progressive, emancipatory consciousness and praxis to which, I conjecture, meditation, as distinct from the mindfulness movement, contributes

Madness and Mindfulness: How the "Personal" is "Political"

The chapter examines the institutionalization of unreason and the potential role of meditation in disclosing its roots. It is argued that meditative awareness can enable critical reflection on, and transformation of, practices that diminish our rational awareness. Mindfulness may contribute to this awareness, but its lack of an ethical frame renders it vulnerable to narcissistic appropriation and corporate commercialization. Accordingly, mindfulness is limited in disclosure, and counteracting, of the needless perpetuation of suffering associated with ego-building and defensive emotions, as manifest in contemporary expressions of sectarianism and fanaticism. The examination of antidotes to unreason and freedom is accomplished through a series of critical reflections upon the insights generated by Wright Mills’ The Sociological Imagination, Carol Hanisch’s “The Personal is Political,” and Freire’s Pedagogy of the Oppressed. These texts provide complementary commentaries on the development of progressive, emancipatory consciousness and praxis to which, I conjecture, meditation, as distinct from the mindfulness movement, contributes