Abstract: A method for re-refining used oils comprises contacting feedstock comprising purified used oil with extraction solvent to perform continuous liquid-liquid solvent extraction, to produce an extract stream comprising the extraction solvent and an extract dissolved in the extraction solvent. The feedstock and the extraction solvent are agitated by a variable speed agitator during the solvent extraction at a selected agitation speed. The extract is separated from the extraction solvent and subjected to a continuous flow liquid phase hydrogenation treatment to produce an oil product. A system for performing the method includes a purification unit for purifying the used oil; an extraction column for extracting the extract from the feedstock; and a continuous flow liquid phase hydrogenation unit. The extraction column comprises an agitator configured to agitate the feedstock and the extraction solvent flowing through the extraction column at a variable agitation speed.

Abstract: A method for re-refining used oils comprises contacting feedstock comprising purified used oil with extraction solvent to perform continuous liquid-liquid solvent extraction, to produce an extract stream comprising the extraction solvent and an extract dissolved in the extraction solvent. The feedstock and the extraction solvent are agitated by a variable speed agitator during the solvent extraction at a selected agitation speed. The extract is separated from the extraction solvent and subjected to a continuous flow liquid phase hydrogenation treatment to produce an oil product. A system for performing the method includes a purification unit for purifying the used oil; an extraction column for extracting the extract from the feedstock; and a continuous flow liquid phase hydrogenation unit. The extraction column comprises an agitator configured to agitate the feedstock and the extraction solvent flowing through the extraction column at a variable agitation speed.

Abstract: A method for re-refining used oils comprises contacting feedstock comprising purified used oil with extraction solvent to perform continuous liquid-liquid solvent extraction, to produce an extract stream comprising the extraction solvent and an extract dissolved in the extraction solvent. The feedstock and the extraction solvent are agitated by a variable speed agitator during the solvent extraction at a selected agitation speed. The extract is separated from the extraction solvent and subjected to a continuous flow liquid phase hydrogenation treatment to produce an oil product. A system for performing the method includes a purification unit for purifying the used oil; an extraction column for extracting the extract from the feedstock; and a continuous flow liquid phase hydrogenation unit. The extraction column comprises an agitator configured to agitate the feedstock and the extraction solvent flowing through the extraction column at a variable agitation speed.

Abstract: Methods, systems, and storage media for the online scheduling of sessions or appointments from within a networking platform are disclosed. Exemplary implementations may: receive an image or video including a tag identifying a provider or a service of a provider; cause display of the image/video in a feed, story, or reel associated with a user of the networking platform; receive a selection of the tag; in response to the tag selection, cause display of information associated with the provider, the information including a selectable session request indicator; receive a request to engage in a session(s) with the provider (via user selection of the session request indicator); receive detail(s) associated with the engagement request; receive an indication that the request is complete; and send, via a networking-platform-specific communication application, a communication to the user informing the user of request approval or rejection, or indicating the request is pending.

Abstract: A method for re-refining used oils comprises contacting feedstock comprising purified used oil with extraction solvent to perform continuous liquid-liquid solvent extraction, to produce an extract stream comprising the extraction solvent and an extract dissolved in the extraction solvent. The feedstock and the extraction solvent are agitated by a variable speed agitator during the solvent extraction at a selected agitation speed. The extract is separated from the extraction solvent and subjected to a continuous flow liquid phase hydrogenation treatment to produce an oil product. A system for performing the method includes a purification unit for purifying the used oil; an extraction column for extracting the extract from the feedstock; and a continuous flow liquid phase hydrogenation unit. The extraction column comprises an agitator configured to agitate the feedstock and the extraction solvent flowing through the extraction column at a variable agitation speed.

Abstract: Embodiments of the present disclosure are directed to systems and methods for acquiring a tissue sample in an endoscopic procedure. In one implementation, a biopsy needle is provided. The biopsy needle includes an elongated body extending along a longitudinal axis. The elongated body includes a lumen extending therethrough and a distal end. The distal end includes at least two tines and a plurality of cutouts. Each of the tines includes two ground bevels formed on two grind planes. Each cutout resides between two adjacent tines and includes a V-shaped section. Each cutout may further include a longitudinally straight section.

Abstract: An electrodeless apparatus for determining a function of the electrical charge condition in a flowable liquid media containing electrical charge influencing species comprising a tubular flow path member, the flow path member having electrically insulating walls, an open end and a closed end, the flow path being so disposed that it may be substantially filled with the liquid, a reciprocating member whose outer wall is electrically insulating disposed within the flow path member, the reciprocating member having a transverse cross-sectional configuration such that the reciprocating member fits adjacent but spaced from the electrically insulating walls of the flow path member, an annulus for admitting predetermined amounts of flowable material to the flow path member, a sensor disposed on the non-wetted side of the flow path member for developing a signal proportional to a desired ion activity by electrostatic or inductive coupling, and means coupled to said sensor for amplifying any electrical signal induced acr