A centrifugal field-flow fractionation device includes: a rotor having a rotation axis, the rotor being provided to be rotatable about the rotation axis; a cover covering the rotor; a protective member arranged inside the cover to over the rotor about the rotation axis; a shock-absorbing member arranged between the protective member and the cover; and a fixing part provided in a breakable manner to fix the protective member to the cover. The rotor is arranged such that the rotation axis orients in a horizontal direction. In a case where a part of the rotor disintegrates and is brought into contact with the protective member during the rotation of the rotor, the fixing part breaks to cause the protective member and the shock-absorbing member to move with the rotor while receiving the impact of the rotor to buffer the kinetic energy of the rotor.

A fluid sampling device, the device having a fluid composition sensor configured to receive a fluid sample and capture a plurality of particles from the fluid sample at a collection media, wherein the fluid composition sensor is further configured to generate particle data associated with the plurality of particles using a particle imaging operation, and a controller, the controller being configured to: determine an optimal sample volume associated with a sample collection operation based at least in part on a particle load condition defined by the plurality of particles captured at the collection media during the sample collection operation, and update one or more operational characteristics of the fluid composition sensor such that the sample collection operation is defined at least in part by the optimal sample volume.

The present disclosure describes a sample cell, method, and a computer implemented method of characterizing particles via an analytical flow field. In an exemplary embodiment, the sample cell includes (1) a sample cuvette including a top sample membrane, a sample container to contain a sample, and a bottom sample membrane, (2) a reference cuvette including a top reference membrane, a reference container to contain a solvent, and a bottom reference membrane, (3) where the sample cell is configured to allow a concentration boundary to form within the sample cell, and (4) where the sample cell is configured to allow the concentration boundary to move toward a bottom of the sample cell until equilibrium is reached in the sample cell.

A method for identifying characteristics of well data comprises receiving hydraulic fracturing data comprising data channels from a stage or stages of a hydraulic fracturing sequence and preprocessing the data channel, which may include normalizing and recalibrating the hydraulic fracturing data. The method further involves generating one or more additional higher order channels based on the normalized and recalibrated hydraulic fracturing data, the one or more additional channels derived at least in part from parameters of the normalized and recalibrated hydraulic fracturing data. The system may combine the higher order channels with the accessed data channels, and further process, combine and otherwise identify hydraulic fracturing events at the well being hydraulically fractured based on the received hydraulic fracturing data and the one or more additional channels. From the identified events, the system may alter hydraulically fracturing attributes of a stage being completed and/or subsequent stages of the well or subsequent wells.

The present invention relates to a fluorescence sensor for measuring microalgae and a method of operating the same. The fluorescence sensor for measuring the microalgae includes a fluorescence measurement unit including a light emitter configured to irradiate excitation light onto a measurement region and a detector configured to measure fluorescence emitted from the measurement region, an algae control unit configured to form a node and an antinode of an ultrasonic standing wave in the measurement region to control an algal density, and a signal processing unit configured to calculate the algal density using fluorescence intensity signals according to an operation mode of the algae control unit.

A system for characterizing at least one particle from a fluid sample is disclosed. The system includes a filter disposed upstream of an outlet, and a luminaire configured to illuminate the at least one particle at an oblique angle. An imaging device is configured to capture and process images of the illuminated at least one particle as it rests on the filter for characterizing the at least one particle. A system for characterizing at least one particle using bright field illumination is also disclosed. A method for characterizing particulates in a fluid sample using at least one of oblique angle and bright field illumination is also disclosed.

An apparatus for generating a two dimensional map representative of a turbid or clear medium (11) includes a system (12) for generating incoherent light within a medium (11), a light collecting system (13) that is movable or stationary relative to the medium (11) being analyzed and that is arranged for collecting light exiting the medium (11), and a spectrum analyzer (14) configured to determine spectrum data of the light exiting the turbid medium (11) and to transmit the spectrum data to a computing unit (15). The computing unit (15) is configured to generate a two dimensional map, in which one dimension of the map is wavelength and a second dimension is a position of the light collecting system (13). The invention is also direct-ed to a method for classifying media using the two dimensional map generated with the apparatus. The method comprises steps of feeding and training neural networks and using the trained neural networks to classify unknown media.

Method and system for determining a confinement size in a porous media, including subjecting the media to a substantially uniform static magnetic field, applying a magnetic resonance pulse sequence to the media, detecting magnetic resonance signals from the media, determining non-ground eigenvalues from the magnetic resonance relaxation spectrum, and determining a confinement size of the media from the eigenvalues.

A method for detecting particles in a liquid includes following operations. A detection device is provided. A chemical liquid is provided to flow through the detection device. A capacitance of the detection device is measured during the flowing of the chemical liquid. A dielectric constant of the chemical liquid is calculated according to the capacitance of the detection device. When the dielectric constant of the chemical liquid is between an upper limit and a lower limit, the chemical liquid is determined to be normal.

A particle detection system may include a laser optical source providing a beam of electromagnetic radiation, one or more beam shaping elements for receiving the beam of electromagnetic radiation, an optical isolator disposed in the path of the beam, between the laser source and the one or more beam shaping elements, a particle interrogation zone disposed in the path of the beam, wherein particles in the particle interrogation zone interact with the beam of electromagnetic radiation, and a first photodetector configured to detect light scattered and/or transmitted from the particle interrogation zone, a second photodetector configured to monitor power of the beam, and a controller configured to adjust the beam power based on a signal from the second photodetector, wherein the optical isolator is configured to filter optical feedback from the particle detection system out of an optical path leading to the second photodetector. The particle detection system may be configured to have a lower detection limit of 5 nm to 50 nm effective particle diameter. The laser optical source may have a laser power of 300 milliwatts to 100 watts.