Abstract: The present invention is a fume hood with a mechanism of air suction together with air supply to save energy while locally exhausting pernicious gases near a contaminant source.

Abstract: A method for removing environmental contaminants includes: blowing the environmental contaminants along a predetermined direction with a blower; and extracting the blown environmental contaminants along the predetermined direction with a ventilation device; further characterized in: the placement of a guiding side plates between the blower and the ventilation device for guiding a flow path of air flow; and operating with a low blowing force and a strong vacuum force. The present invention also provides a device for removing environmental contaminants.

Abstract: A gas sensor is disclosed, which includes two separate metal electrodes on a surface of a substrate and a semiconductor thin film deposited on the surface of the substrate and connecting the two metal electrodes. The semiconductor thin film contains zinc oxide or a mixed oxide of zinc and indium, and the zinc oxide or the mixed oxide of zinc and indium are in the form of nanowires which constitute a gas-sensing surface of the semiconductor thin film. The nanowires have a diameter of 50-900 nm. The present invention also discloses a method for detecting the presence of a NOx gas.

Abstract: The present invention is a push-pull ventilation hood having a push device to obtain a push air flow and a pull device to exhaust contaminant flow with an exhaust opening and the two devices properly coordinated with each other, wherein, when the push flow flows through a contaminant source, a contaminated flow of the push flow is exhausted through the exhaust opening. Based on the design process according to the present invention, a push-pull hood with the highest efficiency of push velocity can be designed and the push-pull hood can economically and effectively control the contaminant source.

Abstract: A pulse-type gas concentration measurement system and a method of pulse-type gas concentration measurement in a specific environment. When the sensor is located at a specific position, a variable pulse-modulated voltage is sent to the sensor, so that the sensor outputs a first signal to the processing device. The processing device compares the first signal to the chemical matter characteristics signals to determine the composition and concentration of respective constituents in the gas, and determines a detection voltage according to the first signal. Then, a square-wave pulse with the detection voltage is sent intermittently to the sensor, so that the sensor outputs a second signal to the processing device. The processing device compares the second signal to the chemical matter characteristics signal to determine the concentration variation of each respective constituent of the gas.

Abstract: A porous denuder system includes: a sample inlet, which is a hollow tube and has a first connecting element at its top, external end; a particle sorter comprising one or a plurality of annular sorters, the sorter located in the sample inlet and one of its ends being pushing against an inside of the top end of the sample inlet; a porous collecting element being made of a porous material; and a sampling body which is a hollow tube and has a first connecting element at its external top end for connecting to the first connecting element at the sample inlet external top end, and a stopper at its bottom end for pushing against the porous absorbing element so the porous absorbing element is placed between the particle sorter and the stopper, and the stopper has a through hole or a through tube at its center for connecting to an external part.

Abstract: A method for monitoring exposure time of workers involves the use of a sensor, which is carried by the workers for monitoring continually in a real-time fashion in an environment such that the results are recorded by a recorder. The an add-on or built-in timer in the sensor or the recorder is used to monitor time, which is recorded in the recorder simultaneously, so as to obtain the real-time continuous exposure level of a hazardous material in the environment.

Abstract: An automatic mass spectrometry analytical system was developed for the quantitative detection of organic toxicant exposure in the human body. A cartridge (such as C18 cartridge) is integrated into the automatic mass spectrometry analytical system. The sample undergoes sample pretreatment by the cartridge before entering the mass spectrometry for analysis. This increases the accuracy and sensitivity of analysis, while also avoiding tedious manual sample pretreatment procedures. The whole analytical process is fully automatic and therefore useful for high throughput sample analysis.

Abstract: A method for monitoring exposure time of workers involves the use of a sensor, which is carried by the workers for monitoring continually in a real-time fashion in an environment such that the results are recorded by a recorder. The an add-on or built-in timer in the sensor or the recorder is used to monitor time, which is recorded in the recorder simultaneously, so as to obtain the real-time continuous exposure level of a hazardous material in the environment.

Abstract: A device is used to monitor a worker's exposure to a hazardous gas in a workplace. The device includes an infrared locating member, a chemical sensor, a controller, and a power source. The infrared locating member is used to monitor the worker's exposure position. The chemical sensor is uses to monitor the worker's exposure concentration. The controller serves as a central processing unit to receive an exposure position signal from the infrared locating member, and an exposure concentration signal from the chemical sensor. The controller is provided with a built-in or externally-connected timer.

Abstract: A virtual cyclone sampler of a hollow rectangular container is provided with an arcuate surface by chamfering an edge thereof. The virtual cyclone sampler is further provided with two guide slots which are located at junctions of the arcuate surface and two adjacent planes sharing the chamfered edge. The guide slots are intended to guide gas or airborne particles to flow into or out of the container. Two virtual cyclone samplers may be connected in symmetry to form a composite virtual cyclone sampler.

Abstract: A device is intended to measure an absorbed dose of a hazardous gas by skin of a human body and is composed of an exposure chamber, a gas concentration control system, and one or more gas sensors. A naked part of the human body is held in the exposure chamber containing the hazardous gas of a concentration which is kept in a predetermined range by the gas concentration control system. As the concentration of the hazardous gas drops below the predetermined range, the gas concentration control system replenishes the exposure chamber with an amount of the hazardous gas with the help of a concentration signal transmitted from the sensors, so that the concentration of the hazardous gas is once again kept in the predetermined range. The absorbed dose of the hazardous gas by skin is computed on the basis of the amount of the hazardous gas that is replenished.

Abstract: An aerosol size-selective sampling device is composed of pre-filter, a base housing, and a collector. The device is intended to take an aerosol sample from a given atmospheric air. The pre-filter is composed of two or more porous filtration materials arranged in one end of the base housing in a parallel manner for allowing the atmospheric air to pass therethrough in a parallel and diverting pattern before the atmospheric air is allowed to pass in a converging manner through the collector which is located in another end of the base housing. The pre-filter is able to attain a desired penetration rate profile as a function of an aerodynamic diameter of aerosol contained in the atmospheric air within a predetermined range of aerodynamic diameter.