摘要:
Method of modelling the evolution of the pH value of a porous medium after injection of an alkaline agent solution into this medium.The alkaline agent is considered as a soda pseudo-constituent of concentration equal to an OH— concentration corresponding to the pH value of the alkaline agent solution injected. An adsorption equation calibrated to experimental data is then used to determine an amount of soda pseudo-constituent adsorbed, from the concentration of the soda pseudo-constituent. Finally, the evolution of the pH value is modelled by modelling the transport of the alkaline agent solution by means of a soda transport simulator, by replacing the soda by the soda pseudo-constituent.
摘要:
A lockable cover and seal for a threaded nozzle or spout, such as a hose bib cock assembly having a passageway, an end face, an external threaded portion adjacent the end face, and anti-siphon valve in the passageway including a portion protruding outward of the end face, generally includes, in combination, a lid, a seal, a swivel arm, and a shielding cap. The lid is bell-shaped and has a central axis, an inner end including a threaded portion for threaded engagement with the threaded portion of the spout, a central cavity and an annular shoulder facing inwardly for juxtaposition to the spout end face. The seal includes an inner side for sealing against the end face of the spout and an outer side for sealing against said annular shoulder and a forward extending central recess for receiving any protruding portion of the anti-siphon valve. The swivel arm includes an inner end rotatingly attached to the outer end of the lid such that the swivel arm is rotatable about the central axis and an outer end including an eye for attaching a lock. A bell-shaped cap fits over the lid and includes an outer end wall having a central orifice therethrough for receiving the swivel arm. The cap extends forward to enclose the lid attached to the spout such that the lid is inaccessible for turning and the cap is freely rotatable about the central axis and incapable of engaging and rotating said lid.
摘要:
A paper shredder for accommodating paper of varying stacks of thickness bound together with staples and the like. A pair of low speed feed rollers are disposed within the device for engaging the paper and for moving the paper into a contoured throat which guides the paper into a primary brush assembly having a set of wire bristles that are rotating at a very high rate of speed. As the paper makes contact with the wire bristles, the paper is pulled along the throat, and simultaneously shredded as it is pulled into the shredding chamber. A stationary wire brush assembly is mounted within the shredding chamber includes a set of long wire bristles that permits the bristles of the two brush assemblies to mesh so that as the bristles of the primary brush assembly are rotated they mesh with the bristles of the stationary brush assembly thereby discharging the shredded paper bits, staples, paper clips and other objects that become lodged in the primary brush bristles the shredding chamber.
摘要:
Method of modelling the evolution of the pH value of a porous medium after injection of an alkaline agent solution into this medium.The alkaline agent is considered as a soda pseudo-constituent of concentration equal to an OH— concentration corresponding to the pH value of the alkaline agent solution injected. An adsorption equation calibrated to experimental data is then used to determine an amount of soda pseudo-constituent adsorbed, from the concentration of the soda pseudo-constituent. Finally, the evolution of the pH value is modelled by modelling the transport of the alkaline agent solution by means of a soda transport simulator, by replacing the soda by the soda pseudo-constituent.
摘要:
An enhanced oil recovery method using injection of aqueous polymer solutions into the reservoir rock, includes the stages of: injecting a first aqueous solution of non-associative hydrophilic polymers into the reservoir in a predetermined proportion so that they adsorb on the reservoir rock; and then injecting a second aqueous solution of associative polymers into the reservoir for oil recovery, with limited adsorption considering the adsorption of the non-associative polymers of the first solution.
摘要:
The present invention relates to an enhanced oil recovery method using injection of aqueous polymer solutions into the reservoir rock, wherein the following stages are carried out: injecting a first aqueous solution of non-associative hydrophilic polymers into the reservoir in a predetermined proportion so that they adsorb on the reservoir rock, injecting a second aqueous solution of associative polymers into the reservoir for oil recovery, with limited adsorption considering the adsorption of the non-associative polymers of the first solution.
摘要:
An apparatus and method for setting up and operating a digital multi-media library configured in such as way as to enable the creation of custom sub-libraries. In this system users are able to create private themed sub-libraries that contain information assets that are excerpts of the main library's information assets. This is accomplished via a special proxy asset structure. The apparatus and method further enables, via use of the custom library feature and the special proxy asset structure, the deployment of digital libraries more quickly than current methods allow, and in a manner that spreads more of the set-up cost into the post-deployment period.