Abstract: Various embodiments include systems and methods to provide selectable variable gain to signals in measurements using incident radiation. The selectable variable gain may be used to normalize signals modulated in measurements using incident radiation. The selectable variable gain may be attained using a number of different techniques or various combinations of these techniques. These techniques may include modulating a modulator having modulating elements in which at least one modulating element acts on incident radiation differently from another modulating element of the modulator, modulating the use of electronic components in electronic circuitry of a detector, modulating a source of radiation or combinations thereof. Additional apparatus, systems, and methods are disclosed.

Abstract: A bit or other vector may be used to identify whether an address range entered into an intermediate buffer corresponds to most recently updated data associated with the address range. A bit or other vector may also be used to identify whether an address range entered into an intermediate buffer overlaps with an address range of data that is to be loaded. A processing device may then determine whether to obtain data that is to be loaded entirely from a cache, entirely from an intermediate buffer which temporarily buffers data destined for a cache until the cache is ready to accept the data, or from both the cache and the intermediate buffer depending on the particular vector settings. Systems, devices, methods, and computer readable media are provided.

Abstract: Multi-characteristic detection is achieved by altering the light incidence angle of a single Integrated Computational Element (“ICE”) used in an optical computing device.

Abstract: A fluid is received into a sample tube. A processor causes an energy to be applied to the sample tube to induce vibration in the sample tube at a resonant frequency of the sample tube containing the fluid. The processor stops the supply of energy to the sample tube. The processor monitors an amplitude of the vibration of the sample tube as the amplitude of the vibrations diminish over a period of time. The processor uses the monitored amplitude to calculate an RF of the sample tube containing the fluid. The processor uses the calculated RF to calculate the viscosity of the fluid.

Abstract: Transmitting acoustic signals from a wellbore. At least some of the illustrative embodiments are methods including transmitting an acoustic signal comprising downhole data, receiving the acoustic signal (the receiving by a receiver disposed within the internal diameter of a casing in the wellbore) converting the acoustic signal to a corresponding first electromagnetic signal, and inducing a second electromagnetic signal in a tubing responsive to the first electromagnetic signal.

Abstract: Apparatus, systems, and methods may operate to select a subset of sensor responses as inputs to each of a plurality of pre-calibrated models in predicting each of a plurality of formation fluid properties. The sensor responses are obtained and pre-processed from a downhole measurement tool. Each of the plurality of predicted formation fluid properties are evaluated by applying constraints in hydrocarbon concentrations, geo-physics, and/or petro-physics. The selection of sensor responses and the associated models from a pre-constructed model base or a candidate pool are adjusted and reprocessed to validate model selection.

Abstract: The disclosure relates to logging sensor or tool including an electromagnetic radiation source operable to emit at least one wavelength of electromagnetic radiation, a detector operable to detect the wavelength of electromagnetic radiation, a polycrystalline transparent ceramic component transparent to the wavelength of radiation, and a flowline between the electromagnetic radiation source and the detector having at least a portion of a wall formed from the polycrystalline transparent ceramic component, the flow line operable to permit the flow of a drilling fluid. Such a sensor may be used in a logging while drilling or measuring while drilling apparatus. The also disclosure relates to a wireline measurement apparatus including a sensor comprising a polycrystalline transparent ceramic component.

Abstract: Systems and methods of in-situ measuring the physical properties of an integrated computational element (ICE) device using surface acoustic wave (SAW) spectroscopy during fabrication are provided. The system includes a measurement device having a pump source providing an excitation pulse generating a SAW on the outer surface of the ICE. The system provides a probe radiation to be interacted with the outer surface of the ICE device and to form an interacted radiation, and an optical transducer configured to receive the interacted radiation and form a signal. An analyzer receives the signal from the optical transducer and determines a property of a material layer on the outer surface of the ICE device, and a second measurement device using at least one of optical monitoring, ellipsometry, and optical spectroscopy, is configured to measure a second property in the ICE device.

Abstract: An optical analysis tool includes an integrated computational element (ICE). The ICE includes a plurality of layers stacked along a first axis. Constitutive materials of the layers are electrically conductive and patterned with corresponding patterns. An arrangement of the patterns with respect to each other is related to a characteristic of a sample.

Abstract: A downhole well fluid sensing device is disclosed for determining thermal conductivity of a formation fluid produced by a sampled subterranean well, the sensor package having an annulus shaped, elongate body defining a cylindrical fluid sampling space, the elongate body and the sampling space having a common longitudinal center axis. The elongate body has a fluid entrance port that provides well fluid ingress into the fluid sampling space and a fluid exit port that provides well fluid egress out of the fluid sampling space. A heat source is coupled to the elongate body and located along a portion of the fluid path, and the heat source inputs heat into sampled well fluid. Finally, temperature sensing devices located between the fluid entrance port and fluid exit port measure heat conducted to the sampled well fluid, wherein each of the temperature sensing devices is radially spaced from the heat source.

Abstract: Downhole fluid sensing device is disclosed for determining heat capacity of a formation fluid produced by a sampled subterranean well, the sensor package having an annulus shaped, elongate body defining a cylindrical fluid sampling space, the sensor package and the sampling space having a common longitudinal center axis. The elongate sensor package body has a fluid entrance port that provides well fluid ingress into the fluid sampling space and a fluid exit port that provides well fluid egress out of the fluid sampling space. A heat source is coupled to the elongate sensor package body and located along a portion of the fluid path, and the heat source inputs heat into sampled well fluid. Finally, temperature sensing devices (located between the fluid entrance port and fluid exit port measure heat conducted to the sampled well fluid, wherein each of the temperature sensing devices is radially spaced from the heat source.

Abstract: Provided herein are novel aromatic heterocyclic compounds or a stereoisomer, a geometric isomer, a tautomer, an N-oxide, a hydrate, a solvate, a metabolite, a pharmaceutically acceptable salt or a prodrug thereof, and their uses for treating Alzheimer's disease. Also provided herein are pharmaceutical compositions containing such compounds, and methods for using such compounds or pharmaceutical compositions thereof to treat Alzheimer's disease.

Abstract: The resonant frequency of an example transducer can be adjusted by changing the effective mass of a backing mass using a tuning module. The tuning module includes a electrical source, a switch, and an electromagnetic coil connected in series as an electrical circuit. The electromagnetic coil is mechanically attached to the backing mass, and is disposed within a reservoir of a magneto-rheological fluid enclosed within a casing. When the switch is closed, the electrical source applies a voltage and current to the electromagnetic coil, and induces a localized magnetic field within the magneto-rheological fluid. In response to this localized magnetic field, the magneto-rheological fluid increases in viscosity, assumes properties comparable to a viscoelastic solid, and become affixed to the electromagnetic coil. As the electromagnetic coil is mechanically attached to the backing mass, the solidified magneto-rheological fluid increases the effective mass of the backing mass.

Abstract: System, methods, and apparatuses for determining properties of a production fluid downhole are presented. In one instance, a system includes a sample-filled sensing device for vibrating a first suspended tube containing a sample of production fluid and producing a first response signal. The system also includes a reference-fluid sensing device with a second suspended tube containing a viscosity -tunable fluid therein. The system vibrates the second suspended tube to create a second response signal. The viscosity of the viscosity -tunable fluid is varied until it is deemed to match that of the sample production fluid. Other systems and methods are presented.

Abstract: A system and method for measuring properties of a sample utilizing a variable integrated computation element (ICE) formed of one or more layers of film that is physically sensitive to an electrical field or a magnetic field applied through the material. The thickness of a layer, and hence the optical properties of the ICE, can be electrically or magnetically altered to adjust the ICE for a analysis of a particular property of the sample, or to calibrate the ICE or to adjust the ICE to compensate for alterations to the ICE resulting from environmental conditions. The film may be formed of electrostrictive materials, piezoelectric materials, magnetorestrictive materials, and/or piezomagnetic materials.

Abstract: A system and method are disclosed for configuring an integrated computational element (ICE) to measure a property of a sample of interest. The system includes an illumination source to provide a sample light which is reflected from or transmitted through a sample. A dispersive element disperses the sample light into wavelength portions. An intensity modulation device having an array of electronically controllable modulation elements is disclosed that forms a pattern which modulates the dispersed sample light. Collection optics focuses the modulated sample light on a detector, which generates a signal that correlates to a property of the sample. The electronically controllable modulation elements can be readily altered to conform to a different measurable property of a sample of interest as desired.

Abstract: An apparatus includes a helical flow tube in a formation testing tool. A current injector injects an electromagnetic current into the flow tube. A receiver coil is positioned to produce a receiver coil signal in response to the electromagnetic current. A processor is coupled to the receiver coil to calculate a conductivity of a fluid flowing through the flow tube based on the receiver coil signal.

Abstract: A downhole system in which an agile light source is used to simulate an integrated optical element to measure one or more characteristics of a fluid in a wellbore.

Abstract: In situ density and compressibility of a fluid sample are determined for a fluid sample collected downhole. The density and compressibility of the fluid sampled is determined by measuring a distance to a piston contained within the sample chamber using an external magnetic field sensor that senses a magnetic field emanating from a magnet provided on the piston internal to the sample chamber. The testing is performed quickly and at the surface in a noninvasive fashion (e.g., without opening the sample chamber).

Abstract: In situ density and compressibility of a fluid sample are determined for a fluid sample collected downhole. The density and compressibility of the fluid sampled is determined by measuring a distance to a piston contained within the sample chamber using an external magnetic field sensor that senses a magnetic field emanating from a magnet provided on the piston internal to the sample chamber. The testing is performed quickly and at the surface in a noninvasive fashion (e.g., without opening the sample chamber).