It is shown that in presence of certain external fields a well-defined self-adjoint time operator exists, satisfying the standard canonical commutation relations with Hamiltonian. Examples include uniform electric and gravitational nonrelativistic relativistic Hamiltonians. The physical intepretation these operators proposed terms arrival momentum space.

OBJECTIVE To identify factors that delay the onset of thrombolysis in patients with acute myocardial infarction (AMI). METHODS A cohort study was carried out with 146 patients, each diagnosed with AMI and subjected to thrombolytic therapy. The data was extracted from medical records between January 2002 and December 2004. RESULTS The average age of the studied population was 57.5 +/- 9 year...

Scattering dynamics are examined for Gaussian and non-Gaussian wave packets with identical momentum densities. Average arrival time delays, dwell times, phase delays calculated scattering from a square barrier, it is shown that the exhibit different average than packets. These differences result non-linear terms in function of packets, which alters self-interaction times Control delay can be ac...