887 research outputs found
Optimal energy decay for the wave-heat system on a rectangular domain
We study the rate of energy decay for solutions of a coupled wave-heat system
on a rectangular domain. Using techniques from the theory of -semigroups,
and in particular a well-known result due to Borichev and Tomilov, we prove
that the energy of classical solutions decays like as .
This rate is moreover shown to be sharp. Our result implies in particular that
a general estimate in the literature, which predicts at least logarithmic decay
and is known to be best possible in general, is suboptimal in the special case
under consideration here. Our strategy of proof involves direct estimates based
on separation of variables and a refined version of the technique developed in
our earlier paper for a one-dimensional wave-heat system
Reaction time and incident cancer: 25 years of follow-up of study members in the UK Health and Lifestyle Survey
<b>Objectives</b><p></p>
To investigate the association of reaction time with cancer incidence.<p></p>
<b>Methods</b><p></p>
6900 individuals aged 18 to 94 years who participated in the UK Health and Lifestyle Survey in 1984/1985 and were followed for a cancer registration for 25 years.<p></p>
<b>Results</b><p></p>
Disease surveillance gave rise to 1015 cancer events from all sites. In general, there was essentially no clear pattern of association for either simple or choice reaction time with cancer of all sites combined, nor specific malignancies. However, selected associations were found for lung cancer, colorectal cancer and skin cancer.<p></p>
<b>Conclusions</b><p></p>
In the present study, reaction time and its components were not generally related to cancer risk
Michael H. v. Gerald D.: The Constitutional Rights of Putative Fathers and a Proposal for Reform
Discussion Draft of the Proposed North Carolina Bar Association Illustrative Form of Legal Opinion for Uniform Commercial Code Secured Lending Transactions
Dodd-Frank\u27s Requirement of Skin in the game for Asset-Backed Securities May Scalp Corporate Loan Liquidity
Discussion Draft of the Proposed North Carolina Bar Association Illustrative Form of Legal Opinion for Uniform Commercial Code Secured Lending Transactions
Reaction Time and Mortality from the Major Causes of Death:The NHANES-III Study
Studies examining the relation of information processing speed, as measured by reaction time, with mortality are scarce. We explored these associations in a representative sample of the US population
Traumatic brain injury, collision sports participation, and neurodegenerative disorders: narrative power, scientific evidence, and litigation
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