Backflow Preventer Installations

The Quantum Backflow Effect

The quantum phenomenon of probability backflow is explored. This remarkable effect arises when considering the motion of a free particle in one dimension. For a state consisting only of positive momenta, it is possible for probability to flow in the opposite direction to the particle’s momentum. A comprehensive review of the literature and some new material is presented on the backflow effect, ...

Breakthrough for a DNA break-preventer.

Mammalian genomes encode about 16 distinct DNA polymerases that participate in different aspects of DNA replication, DNA repair, recombination, or bypass of DNA damage (1, 2). The DNA polymerases used for normal replication generally cannot proceed on damaged DNA. When a damaged site is encountered, replication is stalled at least temporarily, and the lesion may be bypassed by invoking a proces...

INSTALLATIONS Vladimir

Backflow and Density Excitations in Quantum Fluids

By the use of the f sum rule and a separation of density excitations into single and multiple excitations, we derive exact quantum expressions for the ~ backflow contribution to the dynamic structure function S(k, co) and for the discrete single-excitation spectrum ok:. The derivation is carried out for Bose liquids, Fermi liquids, charged quantum liquids, quantum solutions, an impurity atom di...

A Redundant FPGA Based Controller for Subsea Blowout Preventer Stack

A redundant Field Programmable Gate Array (FPGA) based controller for subsea Blowout Preventer (BOP) is presented. Triple modular redundancy technique is used for architecture design, since high reliability is a necessary requirement for subsea BOP control system. A multiprocessor system is developed to enhance reliability of the processors and performance of the system. In addition, the shared...