This paper discusses the role of age in scientific practice from an ethical perspective. In social perception, people tend to categorise others rather automatically along three major dimensions: race, sex, and age.1 Much empirical and theoretical attention has been devoted to the study of racism and sexism, but comparatively little research in the social and behaviural sciences has been directed at understanding what some refer to as the third ‘-ism’: ageism.2 For a serious understanding of the implications of ageism in (...) science, it is necessary to discuss, first, the conflicting relationships between classical and modern concepts of time and calendar age, and thereafter the concept of ageism. (shrink)

This article provides a historico-philosophical profile of late-medieval nominalism. It shows how nominalism placed limitations on the use of logic and natural reason in academic theology. In the first part, the historical meaning and use of the notions ‘moderni’ and ‘nominales’ are explored. In the second part, the methodology of the ‘moderni’ and ‘nominales’ is investigated, showing how nominalist understanding of logic and natural reason led to a separation of philosophy and theology. Three examples are discussed, taken from commentaries on (...) the Sentences. As these examples show, according to a number of ‘moderni’ and ‘nominales’ , logic and natural reason are not able to exclude all ambiguities and heresies from theological discourse. Thus logic loses its privileged function in theology as arbiter of true reasoning, clearing the way for the rules of traditional and ordinary speech, the ‘vulgus modus loquendi’. Only when logic and reason deal with the natural aspects of creation, do they remain authoritative. When applied to the divine, however, they may easily lead to heresy and error. (shrink)

The formation of particles of elemental tin in association with the nucleation of the precipitate phase θ′ in an Al–1.7 at.% Cu–0.01 at.% Sn alloy has been investigated by high resolution transmission electron microscopy. Analysis of lattice images has demonstrated that these tin particles associated with θ′ platelets formed during short-term ageing (typically 3 min at 200 degrees Celcius) exhibit a crystallographic form that is distinctly different from that previously reported in such ternary alloys and also from that observed in (...) the binary alloy Al–0.01 at.% Sn. Those tin particles that could be clearly identified as β-Sn phase shared a crystallographic relationship of the form (001)Sn‖(001)Al‖(001)θ′, [110]Sn‖[100]Al‖[100]θ′ with the α-Al and θ′ phases with which they were simultaneously in contact. The observations imply that, while tin may assist nucleation of platelets of θ′, the formation of θ′ equally influences the crystallography of β--Sn that forms in association with θ′. Following prolonged ageing (typically 50 h at 200°C), the β-Sn particles in contact with θ′ plates had coarsened and diminished in number, and most now exhibited an orientation relationship with α-Al matrix similar to that observed in the binary alloy Al–0.01 at.% Sn (i.e. (100)Sn‖(111)Al, [010]Sn‖[112]Al) and to that previously observed in the later stages of ageing of the ternary alloy Al–1.7 at.% Cu–0.01 at.% Sn. (shrink)