An electrically passive device and method for in-situ acoustic emission, and/or releasing, sampling and/or measuring of a fluid or various material(s) is provided. The device may provide a robust timing mechanism to release, sample and/or perform measurements on a predefined schedule, and, in various embodiments, emits an acoustic signal sequence(s) that may be used for triangulation of the device position within, for example, a hydrocarbon reservoir or a living body.

The present invention relates to a method for detection of air-water interface flux of organic contaminants, which passively and continuously collects contaminants at consecutive points close to a sea surface microlayer, acquires the freely dissolved concentration at the consecutive points of the air and water body close to a water body surface microlayer, and obtains the air-water interface flux of the contaminants through fitting a self-developed model, wherein the consecutive points include a plurality of sampling points along a height direction and a plurality of sampling points along a depth direction. The present invention sufficiently considers the influences of the water body surface microlayer on air-water body exchange, collects the contaminants at the consecutive points close to the sea surface microlayer through a passive sampling method, acquires the freely dissolved concentration at the consecutive points of the air and water body close to a water body surface microlayer, and obtains the air-water interface flux of the related contaminants. The present invention can be applied to determine the air-water body interface flux of organic contaminants.

A device for capturing a predetermined volume of a predefined portion (e.g. first void) of a liquid flow, comprises an inlet, an outlet, and a guide with an element displaceable in a first position for capturing the first liquid portion in a reservoir, and in a second position for blocking access to the reservoir, and for passing the liquid to the outlet. The displaceable element moves in transverse direction to the liquid flow, and has lifting means. The element may be substantially flat, or tubular with an elliptical cross section. A kit of parts and a method of assembly are also claimed.

A device for capturing a predetermined volume of a predefined portion (e.g. first void) of a liquid flow, comprises an inlet, an outlet, and a guide with an element displaceable in a first position for capturing the first liquid portion in a reservoir, and in a second position for blocking access to the reservoir, and for passing the liquid to the outlet. The displaceable element moves in transverse direction to the liquid flow, and has lifting means. The element may be substantially flat, or tubular with an elliptical cross section. A kit of parts and a method of assembly are also claimed.

Composite sampling of a fluid flowing through a conduit includes collecting, in a vessel coupled to the conduit through which the fluid is flowing, a first discrete sample of fluid from the conduit, the first discrete sample having a first selected volume, and collecting, in the vessel and at a first interval from the first sample, a second discrete sample of the fluid from the conduit, the second discrete sample having a second selected volume, thereby forming a composite sample in the vessel while the vessel is coupled to conduit. The composite sample includes the first discrete sample and the second discrete sample, and may include one or more additional discrete samples. An apparatus for collecting the composite sample includes a gas chromatograph, and is arranged such that the composite sample is provided to the gas chromatograph without removing the composite sample from the apparatus or transporting the composite sample.

According to one aspect, the invention relates to an aquatic sample analysis system adapted for in situ use. The system includes an incubation chamber having an optically clear portion and forming an opening for receiving a fluidic sample and apparatus for sealing the opening. The system also includes a sensor for sensing at least one parameter associated with the sample inside the chamber, a control module in communication with the sensor, and a power source.

The present disclosure provides a sensor assembly for a target analyte. The sensor assembly comprises plural sensing sites, each of the sensing sites comprising one or more through holes. Each of the sensing sites has a different through hole configuration corresponding to a different property of the one or more through holes.

The present disclosure provides a sensor assembly for a target analyte. The sensor assembly comprises plural sensing sites, each of the sensing sites comprising one or more through holes. Each of the sensing sites has a different through hole configuration corresponding to a different property of the one or more through holes.

The present disclosure discloses a robot system and method for monitoring farmland nitrogen leaching. The robot system includes a cloud platform, a monitoring robot, and a leachate collection module. The cloud platform is configured to send information about a to-be-measured site and a to-be-measured depth to the monitoring robot and receive measurement information of the monitoring robot; and the monitoring robot is configured to move to the to-be-measured site to be connected to the leachate collection module at the to-be-measured depth of the to-be-measured site, extract a leachate of the leachate collection module, perform leachate nitrogen detection on the leachate, and send a leachate nitrogen detection result to the cloud platform.

The present disclosure discloses a robot system and method for monitoring farmland nitrogen leaching. The robot system includes a cloud platform, a monitoring robot, and a leachate collection module. The cloud platform is configured to send information about a to-be-measured site and a to-be-measured depth to the monitoring robot and receive measurement information of the monitoring robot; and the monitoring robot is configured to move to the to-be-measured site to be connected to the leachate collection module at the to-be-measured depth of the to-be-measured site, extract a leachate of the leachate collection module, perform leachate nitrogen detection on the leachate, and send a leachate nitrogen detection result to the cloud platform.