Abstract: A method for determining tobacco-specific nitrosamines (TSNAs) in cigarette smoke using one-step clean-up coupled with LC-MS/MS is provided, including the following steps: collecting a particulate matter of mainstream cigarette smoke with a Cambridge filter pad, mixing the particulate matter of mainstream cigarette smoke, an internal standards solution and water in a 50 mL plastic centrifuge tube, and vortexing the resulting mixture at room temperature to allow extraction; transferring an extraction solution after filtration to a new centrifuge tube, adding dichloromethane, and vortexing the resulting mixture; centrifuging to collect a dichloromethane extraction solution in a lower layer to another centrifuge tube, and placing the centrifuge tube in a water bath to remove dichloromethane; dissolving the resulting extraction solution in water, and transferring the resulting solution to an autosampler vial for LC-MS/MS analysis.

Abstract: A method for determining tobacco-specific nitrosamines (TSNAs) in tobacco using one-step clean-up coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) is provided, including the following steps: destemming flue-cured tobacco or sun-cured tobacco, drying, milling, and passing through a sieve; mixing the resulting tobacco, an internal standards solution and water in a plastic centrifuge tube, and vortexing the resulting mixture at room temperature to allow extraction; transferring an extraction solution after filtration to a new centrifuge tube, adding dichloromethane, and vortexing the resulting mixture; centrifuging to collect a dichloromethane extraction solution in a lower layer to another centrifuge tube, and placing the centrifuge tube in a water bath to remove dichloromethane; dissolving the resulting extraction solution in water, and transferring the resulting solution to an autosampler vial for LC-MS/MS analysis.

Abstract: A method and an apparatus for pushing a live broadcast video are provided. The method includes obtaining plural live broadcast videos related to a live broadcast theme, the live broadcast videos including live broadcast videos enabled after a participation entrance of the live broadcast theme is triggered. Tags of the plurality of live broadcast videos are obtained. The tags correspond to video display locations on a live broadcast theme page of the live broadcast theme in a one-to-one correspondence. The tags are added to the live broadcast videos. A live broadcast video to which the tags have been added is selected as a target live broadcast video. The selected target live broadcast video is pushed to the live broadcast theme page in real-time, the target live broadcast video being played at a corresponding display location on the live broadcast theme page.

Abstract: A method and an apparatus for pushing a live broadcast video are provided. The method includes obtaining plural live broadcast videos related to a live broadcast theme, the live broadcast videos including live broadcast videos enabled after a participation entrance of the live broadcast theme is triggered. Tags of the plurality of live broadcast videos are obtained. The tags correspond to video display locations on a live broadcast theme page of the live broadcast theme in a one-to-one correspondence. The tags are added to the live broadcast videos. A live broadcast video to which the tags have been added is selected as a target live broadcast video. The selected target live broadcast video is pushed to the live broadcast theme page in real-time, the target live broadcast video being played at a corresponding display location on the live broadcast theme page.

Abstract: The waterproof connector includes a cover and a waterproof connector component cooperated with the cover. The waterproof connector component comprises a body, a gasket and a fastening piece, an outer surface of the body has a first groove and a second groove, the gasket is positioned on the first groove, the fastening piece is positioned on the second groove.

Abstract: The waterproof connector includes a cover and a waterproof connector component cooperated with the cover. The waterproof connector component comprises a body, a gasket and a fastening piece, an outer surface of the body has a first groove and a second groove, the gasket is positioned on the first groove, the fastening piece is positioned on the second groove.

Abstract: A hand-held device is provided. The hand-held device is used for playing a storage medium and has an indication apparatus. The indication apparatus is divided into a plurality of sections, and one of the sections is driven to twinkle according to the specific period having elapsed for playing the storage medium.

Abstract: A pharmaceutical cartridge piston including a rigid core to resist compression of the piston. The resistance to compression contributes to the piston providing dose accuracy and dynamic recovery advantages.

Abstract: A medication dispensing apparatus that can be actuated with a small force to deliver a precise dose. The apparatus includes a fluid container having an injection chamber and a storage chamber in fluid flow communication. A first plunger is movable to alter the volume of the injection chamber, and a second plunger is movable to alter the volume of the storage chamber. The injection chamber has a cross-sectional area that is smaller than a cross-section area of the storage chamber. During dose setting, a drive assembly drivingly connected to the plungers shifts the plungers different distances so as to reduce the volume of the storage chamber while simultaneously increasing the volume of the injection chamber a similar amount. After dose setting, an actuator is movable with a small force to shift the first plunger to reduce the volume of the injection chamber to force medicine through an outlet of the fluid container.

Abstract: A mechanism for inclining a first housing relative to a second housing of a computer input device. The first housing has at least a support, and an axial line of the support is screwed into the lower housing. The support is inclinable relative to the lower housing at an angle sufficient to activate a corresponding micro switch within the input device.

Abstract: A hand-held device is provided. The hand-held device is used for playing a storage medium and has an indication apparatus. The indication apparatus is divided into a plurality of sections, and one of the sections is driven to twinkle according to the specific period having elapsed for playing the storage medium.

Abstract: A computer input device includes a control unit, a coordinate detecting module for detecting movement of the input device on a working surface, a roller on the body of the input device for generating a first scrolling signal, and a function key. When a user activates the function key and moves the input device, then the control unit will generate a second scrolling signal to cause both horizontal and vertical scrolling in response to detection of movement by the coordinate detecting device.