TWINNING AND LEGITIMACY

Twinning and Nonlinear Optics

A comprehensive theory of quasi-phase-matched (QPM) three-wave interactions in twinned plates of q3m semiconductors is developed. The 180* phase change required by QPM is studied by treating the nonlinear polarization as a bilinear form in the applied electric field and decomposing it into invariant and sign changing parts under a 2-fold rotation of an arbitrary crystal lattice. A new 3 X 3 mat...

Political Legitimacy and Democracy

The stability and functioning of any kind of political regime—including democratic or representative ones—relies on the combination of the capacity of rulers and government officials to use coercion and the development of political legitimacy. Political legitimacy can be described as people's recognition and acceptance of the validity of the rules of their entire political system and the decisi...

Deliberation and Democratic Legitimacy

Joshua Cohen In this essay I explore the ideal of a 'deliberative democracy'.1 By a deliberative democracy I shall mean, roughly, an association whose affairs are governed by the public deliberation of its members. I propose an account of the value of such an association that treats democracy itself as a fundamental political ideal and not simply as a derivative ideal that can be explained in t...

Correction: Expanded HTA: Enhancing Fairness and Legitimacy

Prematurity and twinning.

AIM OF THE STUDY Newborns from multiple pregnancies are increasing in number and demonstrate a higher perinatal morbidity and mortality compared to singletons. Prematurity is the main reason for most neonatal diseases in twins, but other variables may play a role and their prenatal evaluation may improve the overall outcome. MAIN FINDINGS Prematurity is six times more frequent in twins and th...