Abstract: A semi-dry type method for automatically sampling PM2.5 particles. The method collects an aerosol sample in a dry mode and extracts it in a wet mode to prevent sampling artifacts. In the dry mode, a first stage utilizes carbon brushes as discharge electrodes to charge aerosol particles which are then collected on a cylinder wall by an electric field setup between a high-voltage central metal rod and a grounded cylinder in a second stage. In the wet mode, deionized (DI) water is injected into an electrostatic particle-into-liquid sampler (EPILS) in a pulsation manner by opening and closing solenoid valves intermittently, which dislodges aerosol particles deposited on the cylinder wall effectively to become a liquid aerosol sample. The liquid aerosol sample is then analyzed for chemical compositions automatically.

Abstract: A semi-dry type electrostatic cyclone sampler includes a cyclone body, an insulate element, a discharge electrode, an air tube, an air introducing means, a discharging means and a flushing means. The insulate element is disposed at a top of the cyclone body and co-defines a cyclone chamber with the cyclone body. The discharging electrode is disposed on the insulate element. The air tube is disposed at a bottom of the cyclone body. The air introducing means is for introducing a particulate-containing air stream into the cyclone chamber. The discharging means is for charging the particulates so that the particulates can attach to an inside of the cyclone body. The flushing means is for flushing the inside of the cyclone body and collecting part of the particulates. When the discharging means activates, the air introducing means activates simultaneously. When the flushing means activates, the discharging means is deactivated.

Abstract: A test apparatus of gases is provided for transmitting gases in a plurality of gas tubes to a test tube for testing, the test apparatus including a test main body, a cover plate and a connecting component for selection. The test main body includes a container tank; gases inside the container tank are exhausted via an exhaust tube. The cover plate is disposed on the test main body for sealing the container tank. The cover plate includes a central channel and a plurality of surrounding channels that surround the central channel. The central channel connects the test tube and the surrounding channels respectively connect the gas tubes. The connecting component for selection is disposed rotatably in the container tank toward a rotating direction and is attached closely to the cover plate. The connecting component for selection includes a central gas outlet and a gas inlet.

Abstract: A test apparatus is provided for detecting a gas leakage from at least a rechargeable battery, the test apparatus includes a stainless steel vacuum chamber storing the rechargeable battery and full of the low temperature gases, a first pump coupled to the stainless steel vacuum chamber and sucking the low temperature gases in the stainless steel vacuum chamber so the pressure inside is decreased to a first pressure, a second pump coupled to the stainless steel vacuum chamber, wherein after the pressure inside the stainless steel vacuum chamber is decreased to the first pressure, the second pump sucks the low temperature gas in the stainless steel vacuum chamber so the pressure inside is decreased from the first pressure to a second pressure, and a test device coupled to the second pump and tests the gas leaked from the rechargeable battery among the low temperature gas.