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The cosmological constant term is assumed to be treated as dark energy and thus merged into the density and pressure terms. During the Planck epoch, one cannot neglect quantum effects. So they may cause a deviation from the Friedmann equations.
The P-loop main chain is shown in red, the Mg 2+ ion as green sphere and the side chains of the amino acids K16 and S17 are shown as sticks. Walker A motif, also known as the Walker loop, or P-loop, or phosphate-binding loop, is a motif in proteins that is associated with phosphate binding. The motif has the pattern G-x (4)-GK- [TS], where G, K ...
The Walker circulation, also known as the Walker cell, is a conceptual model of the air flow in the tropics in the lower atmosphere ( troposphere ). According to this model, parcels of air follow a closed circulation in the zonal and vertical directions. This circulation, which is roughly consistent with observations, is caused by differences ...
Developed in the Philippines, this method (abbreviated HPSD) consists of a cylinder pressure cap made from a 3 mm thick mild steel plate secured with 8 sets of bolts, a 2-HP diesel engine, and a pressure regulator with 1.4–14 kg/m 2 capacity. The cap is placed over the stump of a pole, tree or bamboo and the preservative is forced into the ...
Chromated copper arsenate. Chromated copper arsenate (CCA) is a wood preservative containing compounds of chromium, copper, and arsenic, in various proportions. It is used to impregnate timber and other wood products, especially those intended for outdoor use, in order to protect them from attack by microbes and insects.
Alkaline copper quaternary, usually abbreviated ACQ, is a type of water-based wood preservative product containing a soluble copper (II) complex and quaternary ammonium alkyl - or aryl -substituted compounds ("quats"). Thus the product was originally called ammoniacal copper/quaternary ammonium. [ 1][ 2]
Negative-pressure wound therapy (NPWT), also known as a vacuum assisted closure (VAC), is a therapeutic technique using a suction pump, tubing, and a dressing to remove excess exudate and promote healing in acute or chronic wounds and second- and third-degree burns. The therapy involves the controlled application of sub-atmospheric pressure to ...
Water hammer. Effect of a pressure surge on a float gauge. Hydraulic shock (colloquial: water hammer; fluid hammer) is a pressure surge or wave caused when a fluid in motion is forced to stop or change direction suddenly; a momentum change. It is usually observed in a liquid but gases can also be affected.
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