We propose a cost-effective digital coherent scheme with low-complexity signal processing (DSP) for short-reach optical interconnection. Differential 8-ary quadrature amplitude modulation (D8QAM) 1-decision-aided adaptive differential decoding bypasses carrier recovery and enables cycle-slip-free operation. experimentally demonstrate that the receiver sensitivity of 400-Gb/s D8QAM is insensitiv...

In the far future of an accelerating ΛCDM cosmology, the cosmic web of largescale structure consists of a set of increasingly isolated halos in dynamical equilibrium. We examine the approach of collisionless dark matter to hydrostatic equilibrium using a large N-body simulation evolved to scale factor a = 100, well beyond the vacuum– matter equality epoch, aeq = 0.75, and 53h −1 Gyr into the fu...

Internal and external noise surveys have been carried out around schools in London, UK, to provide information on typical levels and sources to which children are exposed while at school. Noise levels were measured outside 142 schools, in areas away from flight paths into major airports. Here 86% of the schools surveyed were exposed to noise from road traffic, the average external noise level o...

BACKGROUND Expectancies such as memories, motivations and emotions towards alcohol are an important predictor of alcohol consumption in the population. The Alcohol Expectancy Questionnaire (AEQ-III) can measure objectively these expectancies. AIM To study which expectancies are associated to alcohol consumption in adults living in Bucaramanga, Colombia. MATERIAL AND METHODS The AEQ-III was ...

BACKGROUND Several studies show an association between exposure to aircraft or road traffic noise and cardiovascular effects, which may be mediated by a noise-induced release of stress hormones. OBJECTIVE Our objective was to assess saliva cortisol concentration in relation to exposure to aircraft noise. METHOD A multicenter cross-sectional study, HYENA (Hypertension and Exposure to Noise n...