Biphotons, generated from a hot atomic vapor via the process of spontaneous four-wave mixing (SFWM), have following merits: Stable and tunable frequencies as well linewidth. Such merits are very useful in application long-distance quantum communication. However, hot-atom SFWM biphoton sources previously had far lower values generation rate per linewidth, i.e., spectral brightness, compared with...

It is shown that the notion of balancing a state space realization about a stable, isolated equilibrium point can be generalized to systems possessing only a stable invariant regular submanifold of arbitrary dimension, for example, a stable limit cycle.

Direct numerical simulations have been performed for heat and momentum transfer in internally heated turbulent shear flow with constant bulk mean velocity temperature, $u_{b}$ $\theta_{b}$, between parallel, isothermal, no-slip permeable walls. The wall-normal transpiration on the walls $y=\pm h$ is assumed to be proportional local pressure fluctuations, i.e. $v=\pm \beta p/\rho$ (Jim\'enez et ...

Floating wind turbines represent a cost-efficient energy solution in deep water where bottom-fixed turbine becomes excessively expensive. However, mooring design is quite challenging for all shallow depths including the transition depth between and floating turbines, order of 50–80 m, which concepts might become more cost-effective than ones. In this paper, system are studied considering both c...