Systems and methods for analyzing groundwater samples with multiple organic tracer species from a petroleum containing reservoir include obtaining the sample, isolating an aqueous fraction of the groundwater sample, separating the aqueous fraction into a plurality of components, where each component corresponds to a different one of the organic tracer species, combining each of the separated components with at least one lanthanide element to form a plurality of component solutions, where a ratio of the at least one lanthanide element to the separated component in each component solution is 5:1 or greater, and analyzing each component solution to determine a relative amount of each organic tracer species in the groundwater sample.

A method for fabricating a semiconductor device is provided. The method for fabricating the semiconductor device includes forming a semiconductor pattern including a first layer and a second layer on a substrate, forming a coating layer on a surface of the first layer, forming a dyeing substance in which one of an antibody or a protein is combined with a fluorophore, attaching the dyeing substance to a surface of the coating layer to form a dyeing layer, and photographing the fluorophore with an ultra-high resolution microscope to detect the semiconductor pattern.

Among other things, this application describes systems and methods for detecting gas using a wide band light source, and at least two narrow band light sensors, wherein each sensor may be operable to detect light at a different range of wavelengths. Additionally, the gas detector device may comprise a color changing indicator operable to react with gas in the air to change color, wherein different gases may react to create different colors, and wherein the sensors detect light reflected by the color changing indicator from the wide band light source. The gas detector device may comprise a processor in communication with the at least two light sensors operable to receive detected reflected wavelength information from the light sensors, and determine the type of gas that reacted with the color changing indicator based on the color detected by the sensors, wherein each color may be associated with a different type of gas.

A method for quantitatively and indirectly measuring non-fluorine anti-soil chemistry in carpet applications, is based on a known amount of FI trace to be added along with anti-soil chemistry in formulation prior to application to a carpet surface. The anti-soil chemistry with the trace amount of FI is then applied to the carpet through a topical foam or spray applicator during a precoating process. After completion of the precoat process, a carpet sample is collected, carpet face fiber is shaved, and FI is extracted using water. The extracted water solution is used to measure the fluorescence intensity (in counts per second or “CPS”) using a Fluorimeter.

Provided are a system for monitoring a hydroxyl radical scavenging index in water using a real-time multi-fluorescence analyzer and a parallel factor analysis apparatus and a method therefor, wherein the system monitors the hydroxyl radical scavenging index in water using the real-time multi-fluorescence analyzer and the parallel factor analysis apparatus, whereby it is possible to monitor the characteristics of an organic material in target water through a continuous flow analysis method without using an existing indicator material, rhodamine B. In addition, in a water treatment system having an advanced oxidation process (AOP) applied thereto in which ozone, ultraviolet rays, hydrogen peroxide, and the like are combined, it is possible to simply calculate the hydroxyl radical scavenging index in the target water through an organic material characteristic index for each component obtained by classifying the characteristic structure of the organic material in water using real-time fluorescence analysis by means of a parallel factor (PARAFAC) model. Accordingly, the amount of chemical injection and the amount of ultraviolet irradiation, which are process control variables, can be controlled, and under given operating variable conditions, the removal rate of a target material in water is predicted, whereby the system can also be used as a diagnostic tool for process evaluation in the advanced oxidation process. Furthermore, the system can provide operational convenience that enables process control while reducing the amount of power consumed in the advanced oxidation process even though the type of target material and the water quality characteristics of raw water change.

Methods for performing procedures on single analytes at single-analyte resolution are disclosed. The methods utilize an iterative approach to performing a sequence of steps during a single-analyte process. Control of the single-analyte process is achieved by implementing actions during each iteration based upon one or more determined process metrics. Systems are also detailed for implementing the disclosed methods at single-analyte resolution.

The present disclosure discloses an optochemical sensor for determining a measurand correlating with a concentration of an analyte in a measuring fluid, comprising: a housing having an immersion region configured for immersing in the measuring fluid; a removable cap having a sensor spot, the removable cap removably arranged at the immersion region of the housing, wherein the sensor spot is disposed on a circumferential face; a radiation source disposed in the housing for radiating excitation radiation into the removable cap, wherein a deflection module is disposed in the removable cap as to deflect excitation radiation radiated into the removable cap; a radiation receiver disposed in the housing for receiving received radiation emitted by the sensor spot; and a sensor circuit disposed in the housing and configured to control the radiation source, receive signals of the radiation receiver, and generate output signals based on the signals of the radiation receiver.

Disclosed are methods for detecting a presence or absence of an antimicrobial surface coating including applying at least one detectable fluorophoric dye compound to a substrate, irradiating the surface of the substrate with ultraviolet radiation in the 100-415 nm wavelength range to excite the detectable fluorophoric dye compound, observing fluorescence of the excited fluorophoric dye compound, and determining the presence or absence of the antimicrobial surface coating based on the observed fluorescence. Further disclosed are antimicrobial surface coating solutions, methods for their application, and methods for confirming the presence and coverage of antimicrobial surface coatings.

A photonic gas sensor and a method for producing a photonic gas sensor are disclosed. In an embodiment a photonic gas sensor includes a component housing with at least one cavity, a radiation-emitting semiconductor chip arranged in the cavity and configured to transmit electromagnetic radiation in a first wavelength range, a radiation-detecting semiconductor chip arranged in the cavity and configured to detect electromagnetic radiation in a second wavelength range and an active sensor element having a fluorescent dye configured to emit electromagnetic radiation in the second wavelength range upon being excited by electromagnetic radiation in the first wavelength range, wherein an intensity of the emitted electromagnetic radiation in the second wavelength range changes reversibly in presence of a gas to be detected.

The present disclosure relates to the field of organic light emitting materials, and in particular, to a fluorescent probe compound for zinc ion, as well as a preparation method and use in zinc ion detection thereof. The fluorescent probe compound of the present disclosure has a name of 2-(7-(2,8-dimethyl quinoline-6-yl)-5,6,7,8-tetrahydro-1,8-naphthyridin-2-yl) phenol, and is synthesized with 2,8-dimethyl tetrahydroquinoline and 2-(2-phenolyl)-1,8-naphthyridine as main raw materials. Fluorescence property tests show that the fluorescent probe compound of the present disclosure has a high selectivity and sensitivity for Zn.sup.2+, a high chemical stability and a good water solubility, which particularly suitable for detecting Zn.sup.2+ in a water environment system. The excitation and emission spectrums of the compound are in a visible region, which could serve as a fluorescent probe applied to the field of zinc ion detection.