A perfectly matched layer (PML) absorbing material composed of a uniaxial anisotropic material is presented for the truncation of finite-difference time-domain (FDTD) lattices. It is shown that the uniaxial PML material formulation is mathematically equivalent to the perfectly matched layer method published by Berenger (see J. Computat. Phys., Oct. 1994). However, unlike Berenger's technique, the uniaxial PML absorbing medium presented in this paper is based on a Maxwellian formulation. Numerical examples demonstrate that the FDTD implementation of the uniaxial PML medium (...) is stable, equal in effectiveness as compared to Berenger's PML medium, while being more computationally efficient. (shrink)

It is often contended that certain enhancement technologies are acceptable, because they simply update traditional ways of pursuing the improvement of human capacities. This is not true with reference to moral bioenhancement, because of the radical difference between traditional and biotechnological ways of producing moral progress. These latter risk having serious negative effects on our moral agency, by causing a substantial loss of freedom and capacity of authentic moral behaviour, by affecting our moral identity and by imposing a standard conception (...) of moral personality. (shrink)

Assuming that moral enhancement is morally permissible, I contend that a more careful theoretical treatment of emotion and the affective landscape is needed to advance both our understanding and the prospects of interventions aimed at moral enhancement. Using Douglas’ proposal for the direct modulation of counter‐moral emotions as a foil for discussion, I argue that the direct modulation of emotion fails to address underlying aspects of an agent’s psychology that will give rise to a range of counter‐moral motives beyond the (...) emotion that is targeted. This is because the direct modulation of emotion does not accommodate the fact that an emotional episode or emotional disposition is part of a network of other dispositions and responses, against a backdrop of our having cares and goals, as well as other cognitive content that can mediate how we apprehend a situation. By focusing on emotion rather than on moral capacity as other critiques have done, I thus argue that direct modulation is likely to be ineffective, and, more positively, by drawing out patterns of connections across the affective landscape, we can better tease out what it is that we should really be targeting if we are to achieve robust and meaningful moral change. (shrink)

Some proponents of moral bioenhancement propose that people should utilize biomedical practices to enhance the faculties and traits that are associated with moral agency, such as empathy and a sense of justice. The hope is that doing so will improve our ability to meet the moral challenges that have emerged in our contemporary, globalized world. In this paper, we caution against this view by arguing that biomedically inducing more empathy may, in fact, diminish moral agency. We argue that this type (...) of increase in empathy would not be effective for addressing empathy’s vulnerability to the biases that can undermine moral judgment. Furthermore, doing so may undermine the important capacity to regulate empathy. We determine that if the moral enhancement project is to be a serious one, it must address these challenges. (shrink)