Recent studies of the tunnelling through two opaque barriers claim that the transit time is independent of the barrier widths and of the separation distance between the barriers. We observe, in contrast, that if multiple reflections are allowed for correctly (infinite peaks) the transit time between the barriers appears exactly as expected. PACS. 03.65.Xp It is a well known result that the tunn...

HE general model proposed by JACOB and MONOD (1961) to explain the control of inducible and repressible enzymes in bacteria has received considerable support to date (AMES and MARTIN 1964). According to this hypothesis, the genetic elements controlling sequential biochemical reactions are clustered on a genetic map into units of regulation called operons. An operon consists of a group of struct...

Carbamazepine has recently been shown to have a vasopressin-like action and, like chlorpropamnide, to be effective in controlling polyuria in patients with diabetes insipidus (Hartman, 1972; Uhlich et al., 1972). In the case reported here carbamazepine, which was being given to a patient suffering from depression and psychogenic polydipsia, induced inappropriate secretion of antidiuretic hormon...

We present an exact treatment of wave propagation in some inhomogeneous thin films with highly spacedependent dielectric constant. It is based on a space transformation which replaces the physical space by the optical path. In the new space, the dispersion equation is that of a normal progressive wave. We will show that the dispersion properties of such films are plasmaor waveguide-like, the ch...

Tunneling without distortion is not a propagation phenomenon but a quasistatic process in which the slowly varying envelope of the input pulse modulates the amplitude of a standing wave in the barrier. Because the envelope has a bandwidth that is small compared to the cutoff frequency of the barrier it does not propagate; it merely stands and waves. The envelope of the reflected and transmitted...