A method for measuring the thermal stability of succinic acid includes the following steps: 1) preparing a succinic acid crystal powder having less than 1% residual water content; 2) placing 10 g of the crystal powder in an oven at 220 C. for 2 hours; 3) pulverizing and sieving the crystal powder processed in this way, such that the particle size distribution thereof is between 0 and 10%, and preferably between 4 and 6% for particles larger than 500 m in size, between 20 and 40%, and preferably between 25 and 35% for particles between 200 and 500 m in size, between 50 and 75% and preferably between 55 and 70% for particles smaller than 200 m in size; and 4) measuring the color, in a spectrocolorimeter, of the pulverized and sieved powder and determining the average value of the yellow (index b).

The present invention relates to an apparatus for evaluating drying quality of an electrode, and the apparatus includes: an oven configured to provide a space in which an electrode is dried; a measuring unit configured to be positioned at an outlet of the oven and measure a color coordinate value of an electrode active material layer with respect to the dried electrode; and an determination unit configured to determine whether the electrode is dry from the color coordinate value, wherein the determination unit sets a reference value, and determines that a dry state of the electrode is defective if the measured color coordinate value is less than the reference value, and a difference between the measured color coordinate value and the reference value is more than a preset value.

A visual turbidity detection device and detection method thereof includes an observing box, an observing assembly, and a light assembly. The observing box includes a box, at least one side of the box defines an observing window, and at least one side of the box is capable of being disassembled to define an opening for taking and placing a sample to be tested. The observing assembly includes a first base and a first rotation shaft. An end of the first rotation shaft is rotatably connected to a bottom wall of the box, a shaft body of the first rotation shaft is fixedly connected to the first base, another end of the first rotation shaft extends out of a top wall of the observing box, and the first base is configured to place the sample to be tested. The light assembly is disposed on an inner wall of the observing box.

A visual turbidity detection device and detection method thereof includes an observing box, an observing assembly, and a light assembly. The observing box includes a box, at least one side of the box defines an observing window, and at least one side of the box is capable of being disassembled to define an opening for taking and placing a sample to be tested. The observing assembly includes a first base and a first rotation shaft. An end of the first rotation shaft is rotatably connected to a bottom wall of the box, a shaft body of the first rotation shaft is fixedly connected to the first base, another end of the first rotation shaft extends out of a top wall of the observing box, and the first base is configured to place the sample to be tested. The light assembly is disposed on an inner wall of the observing box.

A fluid safety device for quick detection of spoilage in food products. The detection method is based on the presence of various contaminants that serve as indicators of food spoilage. The fluid safety device is an easy-to-use, cost-effective device for monitoring the quality of perishable food products, especially fluids, and comprises a reaction pad separated into sections wherein multiple contaminants in the fluid can be tested simultaneously.

A sensor device 10 includes a light projection unit 14, a light reception unit 15, an RGB value acquisition unit 22, a color index value calculation unit 24, and a determination unit 16. The light projection unit 14 projects light. The light reception unit 15 detects reflected light from an area illuminated with the light projected from the light projection unit 14. The RGB value acquisition unit 22 acquires color information about an object present in the illumination area on the basis of the reflected light detected by the light reception unit 15. The color index value calculation unit 24 calculates a single color index value on the basis of the R value, G value, and B value included in the color information acquired by the RGB value acquisition unit 22. The determination unit 16 compares the color index value calculated by the color index value calculation unit 24 with a specific threshold value to determine whether or not an object has been detected.

A kit for detecting an inflammation level of an oral cavity based on a biomarker indicative of inflammation, the kit comprising at least one rinsing substance; a cup sized to contain a predetermined amount of at least one rinsing substance; a colourimetric reference corresponding to a predetermined inflammation level, and a colourimetric indicator reactive to the biomarker in the at least one rinsing substance consistently with the colourimetric reference.

A kit for detecting an inflammation level of an oral cavity based on a biomarker indicative of inflammation, the kit comprising at least one rinsing substance; a cup sized to contain a predetermined amount of at least one rinsing substance; a colourimetric reference corresponding to a predetermined inflammation level, and a colourimetric indicator reactive to the biomarker in the at least one rinsing substance consistently with the colourimetric reference.

A method of determining the concentration of an analyte in a sample of a body fluid with a mobile device having a camera is disclosed. The camera captures an image of a color reference card and of a reagent test field of an optical test strip having a sample applied to it. A predetermined pixel-based mean tone map correction is applied to the image obtained, which results in a first intensity-corrected image. Local brightness information is derived from the first intensity-corrected image. A mobile device-specific tone map correction is applied to the first intensity-corrected image, taking into account the local brightness information. A second intensity-corrected image is thereby obtained. Analyte concentration is determined based on a color formation reaction of the test field by using the second intensity-corrected image. Optionally, a color correction may be derived and applied to the second intensity-corrected image to obtain an intensity-corrected and color-corrected image.

An apparatus comprises a barrel and a colorimetric assay assembly. The barrel has a sidewall defining a portion of a colorimetric chamber that is in fluid communication with an internal chamber defined by an inner surface. The colorimetric assay assembly, housed in the colorimetric chamber, comprises a sample application pad to receive a fluid sample and a colorimetric detection pad to visualize a presence of free hemoglobin. The sample application pad is formed of a prefiltration layer and a filtration layer. The prefiltration layer comprises a distal surface having a first wetting property and a hydrophilic receiving surface having a second wetting property less than the first wetting property and is configured to receive the fluid sample and convey at least a portion of the fluid sample to the filtration layer. The filtration layer is porous to plasma and the free hemoglobin and not porous to red blood cells.