Über die Empfindlichkeit für Gewichtsunterschiede bei abnehmender Reizstärke

Ohne Zusammenfassung     

Precipitation of γ’ during cooling of nickel-base superalloy Haynes 282

ABSTRACT

Cooling-induced precipitation of the strengthening γ’ phase is commonly investigated in Ni-base superalloys with a high γ’ volume fraction, where it is used to control the final microstructure and properties. Less is known about the phase separation in low-volume-fraction alloys during cooling, although the microstructural state after cooling from solution treatment is known to affect subsequent heat-treatment steps. We use atomic-scale characterisation of Ni-base superalloy Haynes 282 (equilibrium γ’ volume fraction around 20%) to show that air cooling after solution or carbide stabilisation results in precipitation of nm-sized γ’ particles, whereas precipitation was suppressed during water quenching. The solution treatment has a significant effect on the hardness and γ’ precipitation during air cooling from the subsequent carbide stabilisation temperature. Also, the carbide-stabilisation treatment itself affects the γ’ precipitation during subsequent air cooling.     

Automatic Behavior – Its Social Embedding and Individual Consequences

Automatic behavior, that is, the non‐conscious activation of perceiver behavior by social category priming, has undergone considerable development in the recent years. While initial effects pointed to often rather surprising effects that could be characterized as imitation of the behavior of the social category itself, current research unfolds a much more complex picture. Not only imitative behavior but, contrasting, also response behavior is getting activated. Response behavior is fundamentally different from imitation and contrast and denotes behavior that is directed toward the social category out of the action ecology of the perceiver. Furthermore, boundary conditions have been established and could reveal that motivation (goals) and social context modulate the selection of specific automatic responses. Most recent findings reveal that social category priming embedded in context also modulates visual attention patterns pertaining to means functional for the response behavior. Similar to the increased complexity of findings, the proposed underlying explanatory models have developed in comprehensiveness. Taken together, automatic behavior now has to be seen as a valid form of social influence, and its benefits and pitfalls are further to be investigated.     

Controlling death by defending ingroups — Mediational insights into terror management and control restoration

A large body of evidence supports the key tenet of terror management theory (TMT) that people manage death anxiety by defending cultural ingroups. However, surprisingly little is known about the motivational processes driving this effect. Given that mortality salience (MS) as well as control deprivation instigate ingroup defense, it is possible that MS effects on ingroup defense are fueled by the motivation to restore control that has been shattered by the inevitability of death. Study 1 revealed that control motivation – operationalized as illusory pattern perception – mediates MS and control deprivation effects on ingroup defense. Study 2 showed that thoughts about lacking control mediate MS and control deprivation effects on perceptions of randomness. Study 3 compared control motivation – operationalized as state need for structure – and death-thought accessibility (i.e., the main mediator candidate in TMT) in terms of mediation of MS and control deprivation effects on ingroup defense. Replicating the results of Study 1, control motivation mediated both MS and control deprivation effects, whereas death-thought accessibility failed to mediate any effects. Using different operationalizations of control motivation, these studies provide broad mediational evidence for the notion that MS-induced ingroup defense serves the function of compensating for the loss of control that is inherent in the inescapability of death.     

Understanding communicative intentions and semiotic vehicles by children and chimpanzees

Developmental and comparative studies of the ability to understand communicative intentions using object-choice tasks raise questions concerning the semiotic properties of the communicative signals, and the roles of rearing histories, language and familiarity. We adapted a study by Tomasello, Call, and Gluckman (1997), in which a “helper” indicated the location of a hidden reward to children of three ages (18, 24, and 30 months) and to four chimpanzees, by means of one of four cues: Pointing, Marker, Picture and Replica. For the chimpanzees, we controlled for familiarity by using two helpers, one unfamiliar and one highly familiar. Even 18-months performed well on Pointing and Marker, while only the oldest group clearly succeeded with Picture and Replica. Performance did not correlate with scores for the Swedish Early Communicative Development Inventory (SECDI). While there were no positive results for the chimpanzees on the group level, and no effect of familiarity, two chimpanzees succeeded on Pointing and Marker. Results support proposals of a species difference in understanding communicative intentions, but also highlight the need to distinguish these from the complexity of semiotic vehicles and to consider both factors.     

The Philosophy of Interdisciplinarity: Sustainability Science and Problem-Feeding

Traditionally, interdisciplinarity has been taken to require conceptual or theoretical integration. However, in the emerging field of sustainability science this kind of integration is often lacking. Indeed sometimes it is regarded as an obstacle to interdisciplinarity. Drawing on examples from sustainability science, we show that problem-feeding, i.e. the transfer of problems, is a common and fruitful-looking way of connecting disparate disciplines and establishing interdisciplinarity. We identify two species of problem-feeding: unilateral and bilateral. Which of these is at issue depends on whether solutions to the problem are fed back to the discipline in which the problem originated. We suggest that there is an interesting difference between the problem-feeding approach to interdisciplinarity and the traditional integrative perspective suggested by among others Erich Jantsch and his colleagues. The interdisciplinarity resulting from problem-feeding between researchers can be local and temporary and does not require collaboration between proximate disciplines. By contrast, to make good sense of traditional integrative interdisciplinarity we must arguably associate it with a longer-term, global form of close, interdisciplinary collaboration.     

Production of recrystallized nano-grains in a fine-grained Cu–Zn alloy

A fine-grained Cu–30%Zn alloy sheet was rolled at 77 K to induce ultrafine mechanical twins. Subsequent annealing of the rolled alloy at temperatures up to 543 K led to the uniform appearance of recrystallized ultrafine grains (UFGs), which contained numerous annealing twins. Average grain sizes of 150 ～ 300 nm were produced in this way. The formation of such UFGs during annealing is attributed to the high nucleus density associated with the fine initial grain size as well as to the high densities of mechanical twins and dislocations produced by cryorolling. The high driving force for recrystallization enabled the use of relatively low annealing temperatures, which limited the subsequent grain growth.     

The role of practice and habituation in Socrates’ theory of ethical development

ABSTRACT

The goal of this paper is to challenge the standard view that Socrates of the early Platonic dialogues is an intellectualist with respect to virtue. Through a detailed analysis of the educational theory laid out in the early dialogues, it will be argued that Socrates believes that the best way to cultivate virtues in his interlocutors is not to convince them of ethical truths by way of reason and argument alone, but to encourage them to participate in the practice of virtue. Habit and practice are essential to the cultivation of virtue because they mould the desires and dispositions of the agent and promote a kind of knowledge that cannot be achieved discursively – craft-knowledge. Only when agents have achieved craft-knowledge can they be counted on to act virtuously on every occasion; and craft-knowledge can only be achieved by way of practice and habituation.