Abstract: An apparatus comprises a distributed acoustic sensing (DAS) optical fiber, a DAS interrogator coupled to the DAS optical fiber, and a connector. The connector couples the DAS interrogator, a first digitizer, and a second digitizer, wherein the first digitizer is to generate a first digitized DAS signal based on an analog DAS signal from the DAS interrogator, and the second digitizer is to generate a second digitized DAS signal based on the analog DAS signal. The apparatus also comprises one or more processors and a machine-readable medium having program code executable to cause the apparatus to simultaneously generate a first set of values that correlate with a first physical property based on the first digitized DAS signal and generating a second set of values that correlate with a second physical property based on the second digitized DAS signal.

Abstract: A distributed acoustic system (DAS) with an interrogator, an umbilical line attached at one end to the interrogator, and a downhole fiber attached to the umbilical line at the end opposite the interrogator. A method for optimizing a sampling frequency may begin with identifying a length of a fiber optic cable connected to an interrogator, identifying one or more regions on the fiber optic cable in which a backscatter is received, and optimizing a sampling frequency of a distributed acoustic system (DAS) by identifying a minimum time interval that is between an emission of a light pulse such that at no point in time the backscatter arrives back at the interrogator that corresponds to more than one spatial location along a sensing portion of the fiber optic cable.

Abstract: Technologies for propagating optical information through an optical waveguide in a downhole environment are provided. An example method can include generating a light signal via a light-emitting device at a first location on a wellbore environment; propagating the light signal through an optical waveguide on an inner surface of a wellbore tool, the optical waveguide including a first layer of low refractive-index material, a second layer of high refractive-index material applied to a first surface of the first layer, and a third layer of low refractive-index material applied to a second surface of the second layer; and receiving, by a detector at a second location on the wellbore environment, the light signal via the optical waveguide on the inner surface of the wellbore tool.

Abstract: A property of a downhole fluid, for example, a chemical species or ion concentration, may be accurately determined and logged based on measurements received from an optical detector where the optical detector is fed information or signals from an optical system coupled to one or more electrochemical probes calibrated for one or more properties of a fluid. The one or more electrochemical probes provide a potential to the optical system based, at least in part, on exposure to the downhole fluid. The optical system receives an optical signal from a light source that is transmitted via a transmission line, such as a fiber optic cable. Downhole information from the optical system is transmitted to the surface via the same or another transmission line. Thus, the signals are in the optical domain rather than the electrical domain. Multiple properties may be measured simultaneously using the same transmission line.

Abstract: A system and a method for performing a borehole operation, wherein the system may comprise a coiled tubing string and a fiber optic cable disposed in the coiled tubing string and wherein the fiber optic cable is strain-coupled to the coiled tubing string. A method of performing a borehole operation may comprise disposing a coiled tubing string into a borehole and wherein a fiber optic cable is strain-coupled to the coiled tubing string, and measuring at least one property of the borehole with the fiber optic cable.

Abstract: An examination apparatus for medical examination, in particular determination of a blood pressure, of an animal, in particular an animal having a paw, particularly preferably an animal from the subfamily of the Felinae. The examination apparatus has a sensor device for the optical examination of an arterial blood flow of the animal, in particular for performing a photoplethysmography. For this purpose, the sensor device has at least one emitter for the emission of electromagnetic radiation and at least one detector for the detection of the radiation emitted by the emitter. The sensor device preferably has several emitters and several detectors that are arranged in a periodic structure. Alternatively or additionally, the sensor device has a limiting device which defines a border of a detection region of the sensor device so that a distance of the border from the sensor device is more than 0.5 mm and/or less than 5 mm.

Abstract: A distributed acoustic system may comprise an interrogator which includes a single photon detector, an umbilical line comprising a first fiber optic cable and a second fiber optic cable attached at one end to the interrogator, and a downhole fiber attached to the umbilical line at the end opposite the interrogator. A method for optimizing a sampling frequency may comprise identifying a length of a fiber optic cable connected to an interrogator, identifying one or more regions on the fiber optic cable in which a backscatter is received, and optimizing a sampling frequency of a distributed acoustic system by identifying a minimum time interval that is between an emission of a light pulse such that at no point in time the backscatter arrives back at the interrogator that corresponds to more than one spatial location along a sensing portion of the fiber optic cable.

Abstract: Disclosed are methods and apparatus for using an audible signal to monitor conditions at a downhole location in a well through use of a well cable containing a fiber optic, which may be either a slickline or a wireline fiber-optic cable, and providing an audible signal which varies in response to the monitored condition. The condition monitored can be strain in the fiber optic well cable, which can be sensed in one or more locations in the fiber optic well cable, in many examples through use of a sensor such as a Bragg grating associated with or formed in an optical fiber within the well cable. In some examples, a temperature measurement may be used to compensate for temperature effects impacting the strain measurement.

Abstract: A system, method, and device for determining volume concentration with diffraction of electromagnetic radiation. A device for determining a volume concentration of a fluid in a sample comprises a transducer, a transmitter, a detector, and a processor. The transducer generates a standing acoustic wave through the sample. The transmitter emits electromagnetic (EM) radiation into the sample such that the EM radiation is diffracted by the sample. The detector is responsive to the diffracted EM radiation and generates a signal indicative of a wavelength of an acoustic wave corresponding to the standing acoustic wave. The processor analyzes the signal to determine the volume concentration of the fluid in the sample.

Abstract: The water cut of a fluid used or produced in conjunction with wellbore operations may be measured or otherwise estimated using an ion selective fiber sensor. For example, a method may include flowing a fluid comprising an aqueous phase and an oleaginous phase through a sensor; contacting an ion selective fiber positioned in the sensor with the fluid, wherein the ion selective fiber has an intrinsic time constant (?0) associated with an intrinsic color change of the ion selective fiber in response to contact with the aqueous phase; measuring a color change of the ion selective fiber in response to contact with the fluid as a function of time; deriving an effective time constant (?eff) for the color change of the ion selective fiber in response to contact with the fluid; and calculating a water cut (Y) in the fluid based on Y= Y = ? 0 ? eff .

Abstract: Technologies for propagating optical information through an optical waveguide in a downhole environment are provided. An example method can include generating a light signal via a light-emitting device at a first location on a wellbore environment; propagating the light signal through an optical waveguide on an inner surface of a wellbore tool, the optical waveguide including a first layer of low refractive-index material, a second layer of high refractive-index material applied to a first surface of the first layer, and a third layer of low refractive-index material applied to a second surface of the second layer; and receiving, by a detector at a second location on the wellbore environment, the light signal via the optical waveguide on the inner surface of the wellbore tool.

Abstract: A device including a sample cell configured to interact a fluid sample with an ion selective substrate to modify an optical characteristic of the ion selective substrate according to an ion concentration of the fluid sample is provided. The sample cell is configured to optically interact an illumination light with the ion selective substrate to generate a sample light. The device includes an integrated computational element configured to interact with the sample light to provide a modified light that has a property indicative of the ion concentration in the fluid sample; and a detector that receives the modified light and provides an electrical signal proportional to an intensity of the modified light.

Abstract: Systems and techniques for determining properties of a formation comprising are disclosed. A test tool attached to test string comprising a fluid conduit is deployed to a test position within a wellbore. The deployment includes hydraulically isolating a portion of the wellbore proximate the test tool to form an isolation zone containing the test position. A fluid inflow test is performed within the isolation zone and an initial formation property and a fluid property are determined based on the fluid inflow test. A fluid injection test is performed within the isolation zone including applying an injection fluid through the test string into the isolation zone, wherein the flow rate or pressure of the injection fluid application is determined based, at least in part, on the at least one of the formation property and fluid property, The fluid injection test further includes measuring pressure within the isolation zone to determine a pressure transient associated with the injection of the injection fluid.

Abstract: Footwear for use during a specialized activity such as skiing, cycling, skating and many other sports or industrial uses, and provides a dorsal element engaging the dorsal aspect of the foot for enabling the user to control relative to the plantar aspect the maximum height of the arch of the foot at substantially all times during the activity regardless of the position or orientation of the foot. A pivotal arm is mounted on a frame attached to the planter aspect for pivotal movement about an axis transverse to the foot and is compressed by an adjustable element operable by the user.

Abstract: Provided are methods of treating feline Coronavirus infections comprising administering a therapeutically effective amount of a compound of Compound 1 to Compound 9, or a pharmaceutically acceptable salt thereof.

Abstract: A distributed acoustic system (DAS) with an interrogator, an umbilical line attached at one end to the interrogator, and a downhole fiber attached to the umbilical line at the end opposite the interrogator. A method for optimizing a sampling frequency may begin with identifying a length of a fiber optic cable connected to an interrogator, identifying one or more regions on the fiber optic cable in which a backscatter is received, and optimizing a sampling frequency of a distributed acoustic system (DAS) by identifying a minimum time interval that is between an emission of a light pulse such that at no point in time the backscatter arrives back at the interrogator that corresponds to more than one spatial location along a sensing portion of the fiber optic cable.

Abstract: A swimsuit (1) has an outer shell (2) made of a flexible stretchable fabric and forms a tubular trunk portion (6) and two tubular thigh portions (7), the swimsuit (1) comprising two back stiffening lines (8) continuously connected to the outer shell (2) and extending each in a generally longitudinal direction of a one of the thigh portions (7) from a rear region (9) of the thigh portion (7) across a rear region of the trunk portion (6), in which said back stiffening lines (8) have a tensile stiffness greater than a tensile stiffness of said outer shell (2).

Abstract: A device for fluid analysis including an integrated computational element (ICE), a sample cell that optically interacts the ICE with a sample to generate a computation light associated with a characteristic of the sample, and a fiber sensor that receives the computation light and converts the computation light into a heat, is provided. The fiber sensor is coupled with a detector through an optical link, and is configured to return a portion of probe light through the optical link to the detector based on the heat converted. A method for using the device for performing fluid analysis is provided. A system for fluid analysis including at least one device as above is also provided.

Abstract: A valve body includes a mixing chamber within the valve body, a plurality of passages through the valve body into the mixing chamber, and a sensor located within the valve body. The sensor has a sensor output representing a property of a fluid within the valve body. A processor is coupled to the sensor output. The processor is programmed to use the sensor output, a density of oil and a density of a subject fluid to determine a fraction of the subject fluid in a fluid flowing through one of the plurality of passages.

Abstract: A metal foil including on at least one of its sides a layer of a material including: a metal or a metal alloy, carbon, hydrogen, and optionally oxygen, the atomic percentage of the metal or of the metals of the alloy in the material ranging from 10 to 60%, the atomic percentage of carbon in the material ranging from 35 to 70%, the atomic percentage of hydrogen in the material ranging from 2 to 20%, and the atomic percentage of oxygen if present in the material being less than or equal to 10%. The metal foil can be used in the manufacture of a cathode of a lithium-ion electrochemical cell. The deposition of this layer reduces the internal resistance of the cell.