3,275 research outputs found
Experimental Demonstration of Nonlinear Frequency Division Multiplexed Transmission
We experimentally demonstrate an NFDM optical system with modulation over
nonlinear discrete spectrum. Particularly, each symbol carries 4-bits from
multiplexing two eigenvalues modulated by QPSK constellation. We show a low
error performance using NFT detection with 4Gbps rate over 640km.Comment: Will be presented in ECOC 2015, Sept. 201
Self-reported health and cardiovascular reactions to psychological stress in a large community sample: Cross-sectional and prospective associations
Exaggerated cardiovascular reactions to acute psychological stress have been implicated in a number of adverse health outcomes. This study examined, in a large community sample, the cross-sectional and prospective associations between reactivity and self-reported health. Blood pressure and heart rate were measured at rest and in response to an arithmetic stress task. Self-reported health was assessed concurrently and five years later. In cross-sectional analyses, those with excellent/good self-reported health exhibited larger cardiovascular reactions than those with fair/poor subjective health. In prospective analyses, participants who had larger cardiovascular reactions to stress were more likely to report excellent/good health five years later, taking into account their reported health status at the earlier assessment. The findings suggest that greater cardiovascular reactivity may not always be associated with negative health outcomes
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Improving aerobic stability and biogas production of maize silage using silage additives
The effects of air stress during storage, exposure to air at feed-out, and treatment with silage additives to
enhance aerobic stability on methane production from maize silage were investigated at laboratory scale.
Up to 17% of the methane potential of maize without additive was lost during seven days exposure to air
on feed-out. Air stress during storage reduced aerobic stability and further increased methane losses.
A chemical additive containing salts of benzoate and propionate, and inoculants containing heterofermentative
lactic acid bacteria were effective to increase aerobic stability and resulted in up to 29% higher
methane yields after exposure to air. Exclusion of air to the best possible extent and high aerobic
stabilities should be primary objectives when ensiling biogas feedstocks
Improving aerobic stability and biogas production of maize silage using silage additives
The effects of air stress during storage, exposure to air at feed-out, and treatment with silage additives to
enhance aerobic stability on methane production from maize silage were investigated at laboratory scale.
Up to 17% of the methane potential of maize without additive was lost during seven days exposure to air
on feed-out. Air stress during storage reduced aerobic stability and further increased methane losses.
A chemical additive containing salts of benzoate and propionate, and inoculants containing heterofermentative
lactic acid bacteria were effective to increase aerobic stability and resulted in up to 29% higher
methane yields after exposure to air. Exclusion of air to the best possible extent and high aerobic
stabilities should be primary objectives when ensiling biogas feedstocks
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