Abstract: A classroom management system which includes a centralized cloud infrastructure, a first user interface having a geo-locating device in communication with the centralized cloud infrastructure, and a second user communication interface in communication with the centralized cloud infrastructure to define authorized users and authorized locations. The centralized cloud infrastructure transmits an in-attendance signal for each authorized user located in the authorized location based on data received from the geo-locating device to the second user communication interface.

Abstract: A classroom management system which includes a centralized cloud infrastructure, a first user interface having a geo-locating device in communication with the centralized cloud infrastructure, and a second user communication interface in communication with the centralized cloud infrastructure to define authorized users and authorized locations. The centralized cloud infrastructure transmits an in-attendance signal for each authorized user located in the authorized location based on data received from the geo-locating device to the second user communication interface.

Abstract: A hybrid condensation-absorption process and unit is disclosed for the recovery of olefins. A mixed-component stream containing hydrogen, methane and olefins is compressed and refrigerated against propylene refrigerant to partially condense the stream. The condensate is stripped of volatile components and fed to a fractionation unit such as a deethanizer. The volatile components stripped from the condensate and the non-condensed vapor from the mixed-component stream are fed to a solvent absorption unit to remove olefins which are absorbed in the solvent. The olefins-rich solvent is regenerated to recover olefins and lean solvent. The lean solvent is recirculated to the absorption unit. The olefins recovered from regeneration of the solvent are fed to the fractionation unit along with the pre-stripped condensate. Vapor from the absorption unit is cryogenically processed to recover a crude hydrogen product, a fuel gas product and residual olefins which can be recycled to the absorption unit.