Is U.N. Security Council Authorisation for Armed Humanitarian Intervention Morally Necessary?

Relative to the abundance of literature devoted to the legal significance of UN authorisation, little has been written about whether the UN’s failure to sanction an intervention can ever make it immoral. This is the question that I take up here. I argue that UN authorisation (or lack thereof) can have some indirect bearing on the moral status of a humanitarian intervention. That is, it can affect whether an intervention satisfies other widely accepted justifying conditions, such as proportionality, “internal” legitimacy, and likelihood of success. The more interesting question, however, is whether the UN’s failure to provide a mandate can make a humanitarian operation unjust independently of these other familiar considerations. Is a proportional, internally legitimate humanitarian intervention, with a just cause and strong prospect of success, still morally unacceptable if it is not approved by the United Nations Security Council? This is the question that I turn to in the second half of the paper.     

The observation of stacking-fault tetrahedra in III-V compounds

Abstract

The first observations of stacking-fault tetrahedra in ion-implanted III-V compounds are reported. The structure and orientation of the stacking-fault tetrahedra are briefly described. The tetrahedra are present in the near-surface region that recrystallized during the annealing. High-resolution images suggest that the stacking-fault tetrahedra are of the vacancy type.     

Hierarchical models for relational event sequences

Interaction within small groups can often be represented as a sequence of events, each event involving a sender and a recipient. Recent methods for modeling network data in continuous time model the rate at which individuals interact conditioned on the previous history of events as well as actor covariates. We present a hierarchical extension for modeling multiple such sequences, facilitating inferences about event-level dynamics and their variation across sequences. The hierarchical approach allows one to share information across sequences in a principled manner—we illustrate the efficacy of such sharing through a set of prediction experiments. After discussing methods for adequacy checking and model selection for this class of models, the method is illustrated with an analysis of high school classroom dynamics from 297 sessions.