There is an upper bound to the amount of power that can be generated by turbines in tidal channels as too many turbines merely block the flow. One condition for achievement of the upper bound is that the turbines are deployed uniformly across the channel, with all the flow through them, but this may interfere with other uses of the channel. An isolated turbine is more effective in a channel tha...

We describe calculations of bb production to next-to-next-to-leading order (NNLO) and next-to-next-to-leading logarithm (NNLL) near threshold in pp interactions. Our calculations are in good agreement with the bb total cross section measured by HERA-B. Factorization assumes it is possible to separate QCD cross sections into universal, non-perturbative parton densities and a perturbatively calcu...

We investigate the cross-section for the production of a low-mass coloursinglet cluster in ee annihilation with a large rapidity gap between the colour-singlet cluster and the other jets. It is argued that such events are the cross-channel analogue of large-rapidity-gap events in deep-inelastic scattering, and therefore could in principle be used to investigate the analytic continuation of the ...

I discuss single top quark production at the Tevatron and the LHC. The cross section, including soft-gluon threshold corrections through NNNLO, is presented for each partonic channel. The higher-order corrections provide significant contributions to the single top cross sections at both colliders.

A numerical simulation is carried out for the thermal storage process in a heat device with magnesia bricks as energy medium. Three types of cross section shapes (square, hexagon, circle) flow channel are considered inlet air temperature high 1023K. The perssure drop, distribution and uniformity obtained. results show that pressure drop circle lowest when Reynolds number less than 2300 (in this...