The invention discloses a biological water-quality detection method using said obstructive multi-module biological water-quality detection device. This device includes an obstruction index-selecting device and a water-quality testing device, wherein the obstruction index-selecting device is used to select a qualified or valid stepped obstruction level combination, the water-quality testing device detects the water-quality of the water body to be tested depending on the behavior at each obstruction in the valid obstruction level combination after injecting indicator organisms into the water body to be tested. The relationship between the degree of water pollution and the distribution area of indicator organisms is established and the distribution area of indicator organisms is counted in this method based on the difference between the behaviors of indicator organisms in the clean water body and the polluted water body count, so as to determine the degree of water pollution.

A control method based on an adaptive neural network model for dissolved oxygen of an aeration system includes: obtaining related water quality monitoring data of a sewage treatment plant, and performing data preprocessing on the related water quality monitoring data; performing principal component analysis on the preprocessed related water quality monitoring data and a dissolved oxygen concentration of the aeration system through a principal component analysis method, and determining a water quality parameter with a highest rate of contribution to a principal component; taking the water quality parameter with the highest rate of contribution to the principal component, and predicting a dissolved oxygen concentration of the aeration system; and optimizing a dissolved oxygen predictive value obtained by means of the adaptive neural network model to obtain an optimal regulation value, and performing online regulation on a fuzzy control system of the adaptive neural network model.

A system for detecting analytes in a test sample, and a method for processing the same, is provided. The system includes a cartridge reader unit that has a control unit and a pneumatic system, and a cartridge assembly that prepares the samples with mixing material(s) through communication channels. The assembly has a memory chip with parameters for preparing the sample and at least one sensor (GMR sensor) for detecting analytes in the sample. The assembly is pneumatically and electronically mated with the reader unit via a pneumatic interface and an electronic interface such that the parameters may be implemented via the control unit. The pneumatic system is contained within the unit and has pump(s) and valve(s) for selectively applying fluid pressure to the pneumatic interface of the assembly, and thus through the communication channels, to move the sample and mixing material(s) through and to sensor. The control unit activates the pneumatic system to prepare the sample and provide it to the sensor for detecting analytes, and also processes measurements from the sensor to generate test results.

A sensing device includes a first sensor configured to capture a first analyte in a fluid medium and to generate a first signal in response to capturing the first analyte. The sensing device also includes a second sensor configured to capture a second analyte in the fluid medium and to generate a second signal in response to capturing the second analyte, where the second analyte is different from the first analyte. The sensing device further includes a detector configured to collect the first and second signals to provide a total signal and to calculate a total concentration of the first and the second analyte in the fluid medium based on the total signal.

An embodiment of a system includes a compartment-generating device, a compartment detector, and electronic computing circuitry. The device is configured to generate compartments of a digital assay, at least one of the compartments having a respective volume that is different from a respective volume of each of at least another one of the compartments. The detector is configured to determine a number of the compartments each having a respective number of a target that is greater than a threshold number of the target. And the electronic circuitry is configured to determine a bulk concentration of the target in a source of the sample in response to the determined number of compartments. Because such a system can be configured to estimate a bulk concentration of a target in a source from a polydisperse digital assay, the system can be portable, and lower-cost and faster, than conventional systems.

An embodiment of a system includes a compartment-generating device, a compartment detector, and electronic computing circuitry. The device is configured to generate compartments of a digital assay, at least one of the compartments having a respective volume that is different from a respective volume of each of at least another one of the compartments. The detector is configured to determine a number of the compartments each having a respective number of a target that is greater than a threshold number of the target. And the electronic circuitry is configured to determine a bulk concentration of the target in a source of the sample in response to the determined number of compartments. Because such a system can be configured to estimate a bulk concentration of a target in a source from a polydisperse digital assay, the system can be portable, and lower-cost and faster, than conventional systems.

Methods of passively sampling PFAS in the environment, PFAS sorbents, apparatus and systems (apparatus plus conditions) for sampling groundwater, porewater, and surface water are described.

An autonomous water quality sensing apparatus, a system and a method for operating the apparatus are provided. In the autonomous water quality sensing system, the autonomous water quality sensing apparatus is configured to move on a track. In the method, a driving mechanism is used to drive the autonomous water quality sensing apparatus to operate over an elevated track surrounding one or more pools. The autonomous water quality sensing apparatus includes a sensing device. The sensor is put into the pool at a planned stop by a sensor deploying mechanism of the autonomous water quality sensing apparatus, so as to obtain water quality data of each of the pools according to a routing plan and a length setting.

An autonomous water quality sensing apparatus, a system and a method for operating the apparatus are provided. In the autonomous water quality sensing system, the autonomous water quality sensing apparatus is configured to move on a track. In the method, a driving mechanism is used to drive the autonomous water quality sensing apparatus to operate over an elevated track surrounding one or more pools. The autonomous water quality sensing apparatus includes a sensing device. The sensor is put into the pool at a planned stop by a sensor deploying mechanism of the autonomous water quality sensing apparatus, so as to obtain water quality data of each of the pools according to a routing plan and a length setting.

A process for detecting oil or lubricant contamination in the production of an article by adding a Stokes-shifting taggant to an oil or lubricant of a machine utilized to produce the article or a component thereof, irradiating the articles produced with a first wavelength of radiation, and monitoring the articles for emission of radiation at a second wavelength. The taggant can be in the form of a composition containing a Stokes-shifting taggant, which absorbs radiation at a first wavelength and emits radiation at a second wavelength, different from said first wavelength, dissolved or dispersed in an oil or lubricant.