The filter of a gas sensor comprises an inorganic porous support supporting both an organic sulfonic acid compound including sulfo group (SO3H) and a Lewis acid having at least a metal element of transitional metal elements, Al element, Ga element, In element, Ge element, and Sn element. The Lewis acid loaded in the inorganic porous support adsorbs low concentration siloxanes. The organic sulfonic acid compound including sulfo group polymerizes adsorbed siloxanes in the filter so as not to desorb from the filter.

An odor filtering lid assembly includes a lid that is positionable on a cooking pot and that has female threads which are integrated into a perimeter of the lid. A first disk has a plurality of first air holes each extending through the first disk to pass air through the first disk. The first disk has male threads integrated into the first disk which threadably engaging the female threads in the lid for removably attaching the first disk to the lid. An air filter is positioned against the first disk to filter odors from air passing through the air filter. A second disk has a plurality of second air holes each extending through the second disk to pass air through the second disk. The second disk is positionable against the first disk such that the air filter is positioned between the first disk and the second disk.

A biogas collection and purification system that includes a plurality of sources of biogas and a network of conduits configured to convey the biogas from the sources to a central processing facility for processing the biogas into methane. The central processing facility removes impurities to convert biogas to biomethane and may include an H.sub.2S removal stage; an activated carbon scrubber; a gas drier; and a carbon dioxide removal stage. The facility also has a biomethane gas compressor configured to deliver the biomethane for use in power plants, for CNG production. Ancillaries to the system include fuel cells for direct electricity generation from biogas/biomethane.

Various example embodiments described herein relate to a sensor assembly. The sensor assembly includes a first sensor cover and a second sensor cover. The first sensor cover is disposed on a first end of the sensor assembly and the second sensor cover is disposed on a second end of the sensor assembly. The first sensor cover defines a first capillary and the second sensor cover defines a second capillary therethrough. The sensor assembly further includes a first sensing unit, a second sensing unit, and a filter. The first sensing unit and the second sensing unit are disposed between the first sensor cover and the second sensor cover. In some example embodiments, the filter is reactive to a target gas and thereby prevents an inflow of the target gas through the second capillary into the sensor assembly.

An oxygen generation device having a compressed air supply device, air cooling coil, a fan, pneumatic valve system, a housing, at least one media insert, an on-off switch, a printed circuit board, and a touch screen. The pneumatic valve system includes an air inlet port, a first air outlet port connected to the inlet of the first media insert, a second air outlet port connected to the inlet of the second media insert. The air inlet port receives compressed air from the compressed air supply device and alternatingly provides the compressed air to one of the first media insert and the second media insert. The lower housing includes check valve ball moveable between the first position and the second position and alternatingly controlling a flow of compressed air through the first media insert and the second media insert.

A laser device includes a laser oscillator, a dehumidifier, and a controller controlling an operation of the dehumidifier. The controller controls the dehumidifier such that the dew point inside the laser oscillator is lower than the first dew point when a monolayer or less of water molecules is adsorbed, or such that the dew point is equal to or higher than the second dew point when more than a monolayer of water molecules is adsorbed inside the laser oscillator, and is lower than the third dew point at which the dew condensation starts to occur inside the laser oscillator.

A biogas collection and purification system that includes a plurality of sources of biogas and a network of conduits configured to convey the biogas from the sources to a central processing facility for processing the biogas into methane. The central processing facility removes impurities to convert biogas to biomethane and may include an H.sub.2S removal stage; an activated carbon scrubber; a gas drier; and a carbon dioxide removal stage. The facility also has a biomethane gas compressor configured to deliver the biomethane for use in power plants, for CNG production. Ancillaries to the system include fuel cells for direct electricity generation from biogas/biomethane.

A venturi-type composite nozzle device for suctioning and removing air pollutants is disclosed. The venturi-type composite nozzle device suctions air pollutants in the vicinity thereof by using negative pressure formed through the venturi principle, and then mixes same with water, jets the mixed water and brings same into contact with the air pollutants again, so as to have a large adsorption ratio of air pollutants in comparison to the amount of water usage, and enables water to be reduced by that amount, and thus has excellent operating performance. To perform such functions, the device employs a venturi-type intake casing, an introducing-spray nozzle, and an impeller.

A method for removing vapors generated by a processing device presenting reduced risk to human handlers includes placing a vapor removing device in a feed area of the processing device. The vapor removing device includes a connecting plate and at least one vapor removing element each connected to one surface of the connecting plate. The vapor removing device is lifted robotically from the feed area and placed into the processing device. Then, the vapor removing element directly removes vapors generated by the processing device when the processing device starts to work, the device being robotically taken out of the processing device and placed back in the feed area.

An audio speaker having a speaker housing surrounding a back volume that is divided into a rear cavity behind a speaker driver and an adsorption cavity separated from the rear cavity by a permeable partition, is disclosed. More particularly, the adsorption cavity may be defined between the speaker housing and the permeable partition, and may be directly filled with adsorptive particles to adsorb gas during sound generation. The permeable partition may allow the gas to flow between the rear cavity and the adsorption cavity, and may retain the adsorptive particles within the adsorption cavity. Other embodiments are also described and claimed.