164 results about "Local field" patented technology

Monitoring brain neural activity comprises repeatedly applying electrical stimuli to evoke neural responses in the brain. Neural responses evoked by the stimuli are recorded. The recorded neural responses are assessed for changed characteristics over time, to monitor a time-varying effect on the recorded neural responses of local field potentials arising from a source other than the electrical stimuli.

Apparatus and method for harvesting energy from the environment and/or other external sources and converting it to useful electrical energy. The harvester does not contain a permanent magnet or other local field source but instead relies on the earth's magnetic field of another source of a magnetic field that is external to the sensing device. One advantage of these new harvesters is that they can be made smaller and lighter than energy harvesters that contain a magnet and/or an inertial mass.

A signal transmitting and receiving system to track the position and orientation of limb segments in order to provide feedback information for the control of the limb movement. The user will generally be seated in a wheelchair that provides a structure upon which orthogonal and/or non-orthogonally oriented coils can be mounted and energized selectively so as to create variously oriented magnetic fields. Multiple wireless sensors injected into the limb detect the local field strength and send information telemetrically to a central controller. The controller extracts information about the position and orientation of each limb segment by combining signals from various sensors according to calibration information and optimal filtering methods for extracting information from multiple nonlinear sensors in mechanically constrained systems.

A system may include an event trigger processor (ETP) configured to receive signals from sensors or another system (FIG. 11). Output signals from the sensor(s), local or remotely located, may be utilized by the ETP as trigger inputs to initiate a process or response, namely authentication actions, which also may be local or remote from the ETP. Events from external systems also may serve as trigger inputs to the ETP. In some embodiments, as a triggered response, the ETP may direct a local field imaging system to acquire an image of an object, generate a digital fingerprint from the image, and query a database using the generated digital fingerprint to identify or authenticate the object. The ETP may initiate or direct various actions by sending a message to another entity or system, for example, using known network communication protocols.

In the method, a field or a number of fields of shared IP address is disposed for a number of BRAS devices and local address field out from the shared IP address is disposed to each BRAS as each BRAS can carry on communication through internal address management protocol between each BRAS to exchange IP address distribution information and to apply IP address to each other. IP address out of local field address should be distributed to the user when each BRAS receives user switch in application. If the local field address is exhausted the application is switched to the other BRAS which has idle address and shares IP address with the said BRAS and the BRAS distributes the address to the user as well as to retransmit it as relevant route. If there is no idle address at all the other BRAS the user is refused to switch in.

Provided herein are a method and system are provided for the localization of clinically relevant electrophysiological signals necessary for the proper placement of the electrodes for nervous system stimulation. The system provides electrical and mechanical means to stimulate or excite neural structures in order to elicit specific neural responses. The method can include mechanical vibratory stimulation, cutaneous electrical stimulation, electrical stimulation of the peripheral nerves, or photic stimulation, and recording of local field potentials and extracting evoked potentials in response to stimulation. The method also includes extracting components of the evoked potentials that relate the signal in the evoked potentials to specific anatomical structures and localization of the source of the evoked potentials recorded so as to identify the location of the source relative to the recording electrode with high resolution by sampling the evoked potentials with a relative large (macro) electrode that is moved in small incremental steps.

A new hybrid nanoparticle, i.e., a nanorice particle, which combines the intense local fields of nanorods with the highly tunable plasmon resonances of nanoshells, is described herein. This geometry possesses far greater structural tunability than previous nanoparticle geometries, along with much larger local field enhancements and far greater sensitivity as a surface plasmon resonance (SPR) nanosensor than presently known dielectric-conductive material nanostructures. In an embodiment, a nanoparticle comprises a prolate spheroid-shaped core having a first aspect ratio. The nanoparticle also comprises at least one conductive shell surrounding said prolate spheroid-shaped core. The nanoparticle has a surface plasmon resonance sensitivity of at least 600 nm RIU⁻¹. Methods of making the disclosed nanorice particles are also described herein.

A local logic solver that operates with a local smart valve controller to control, test and monitor performance characteristics of a local field-mounted emergency isolation valve device, outputting a local indication of trouble on the device, which is mounted in the field away from the facility's central control panel for the process. The local logic solver includes a recording function and memory for retrieval of detected faults that are time-stamped and recorded locally to generate documentation and to track the elapsed time, starting when the degraded state of the device was detected and first signaled as a problem; other performance data is also recorded. Accordingly, the operation of the overall system is simplified by eliminating the need for an external computer to diagnose any problems. A local control panel preferably includes pushbuttons and lights used during routine operations of the valve and a fault indicator light substantially adjacent to or in close proximity to the device being monitored to alert personnel of detected faults.

Certain inventive aspects provide local field imaging with high spatial, time and field resolution by using an array of Hall effect sensors that can be individually read out. The design combines semiconductor Hall sensors and switches that isolate the addressed Hall sensor from the rest of the array. The compact design allows for large and very dense Hall sensor arrays that can be read out in a straightforward way.

In a method for adjustment of the field strength of radio-frequency pulses as well as a magnetic resonance measurement system, radio-frequency pulses are emitted by a radio-frequency antenna of a magnetic resonance measurement system in a magnetic resonance measurement A test volume slice is initially excited by emission of radio-frequency pulses with a defined pulse amplitude by the appertaining radio-frequency antenna and one-dimensional, spatially-resolved characteristic values are determined along an extent direction of the test volume slice. The one-dimensional, spatially-resolved characteristic values respectively represent a local field strength of the B₁ field in strips of the test volume slice running perpendicular to the extent direction. An average value of the determined characteristic values is then formed over at least over one determined segment along the extent direction of the test volume slice. A pulse amplitude of the radio-frequency pulses that is to be set for the magnetic resonance measurement to be implemented is determined on the basis of the average value.

Using resonant interactions to directly and tomographically image neural activity in the human brain using magnetic resonance imaging (MRI) techniques at ultra-low field (ULF), the present inventors have established an approach that is sensitive to magnetic field distributions local to the spin population in cortex at the Larmor frequency of the measurement field. Because the Larmor frequency can be readily manipulated (through varying B_m), one can also envision using ULF-DNI to image the frequency distribution of the local fields in cortex. Such information, taken together with simultaneous acquisition of MEG and ULF-NMR signals, enables non-invasive exploration of the correlation between local fields induced by neural activity in cortex and more ‘distant’ measures of brain activity such as MEG and EEG.

The invention discloses a ferroelectric local field enhanced two-dimensional semiconductor photoelectric detector and a preparation method. The detector is characterized in that: the structure of the detector from top to bottom comprises a substrate, a two-dimensional semiconductor, a metal source and drain electrodes, a ferroelectric functional layer and a semi-transparent metal upper electrode in sequence. The preparation method of the detector comprises the steps: a transition-metal chalcogenide two-dimensional semiconductor is prepared on the substrate, an UV lithography or an electron-beam lithography is adopted and combines stripping technology to prepare a metal electrode serving as a source electrode and a drain electrode of a semiconductor channel, a ferroelectric thin film is prepared on the structure, a semi-transparent or transparent electrode is prepared on the ferroelectric thin film, so that a two-dimensional semiconductor detector structure is formed. The detector can make the two-dimensional semiconductor channel background carriers to be completely exhausted through using polarized ferroelectric materials, tiny voltage is applied between the source electrode and the drain electrode, and photoelectric detection is realized through detecting the current signal change under light. The detector has advantages of high sensitivity, fast response, good stability, low power consumption, wide spectrum detection and the like.

The invention discloses a surface-enhanced Raman scattering substrate based on a surface plasmon polariton local-field coupling effect and a preparation method of the surface-enhanced Raman scattering substrate, and relates to a molecular detection and recognition technique and a preparation method of a metal micro/nano structure. The surface-enhanced Raman scattering substrate consists of the metal micro/nano structure with nano-scale gaps. The surface plasmon polariton local-field coupling effect exists in the gaps. The specific types of the surface-enhanced Raman scattering substrate comprises an Ag nano particle and Ag membrane coupling system, an Ag nano particle and Ag nano aperture array coupling system, and an Ag nano sphere cap and Ag nano aperture coupling system. The preparation method comprises a wet chemical method and a vacuum thermal evaporation deposition method. The preparation method of the surface-enhanced Raman scattering substrate is safe, simple and convenient, complex equipment is not required, the cost is low, the structure is stable and controllable, the repeatability is high and high enhanced factors can be provided at the same time.

A system is provided for stimulating one or more cells, wherein the stimulation is sub-threshold and may alter a transmembrane potential of the one or more cells. For some populations of cells it may be possible to affect the transmembrane potential to gain a therapeutic benefit. Cells of the sino-atrial node spontaneously depolarize predominantly due to the slow depolarization of transmembrane potential. The present system may provide sino-atrial cells with a local field stimulation that while not eliciting an action potential may nonetheless alter local transmembrane potential. Such alteration of transmembrane potential may permit an increase or decrease in a rate of depolarization, and hence modify heart rate.

A device and method for measuring field samples in a liquid form removes the need for dry-and-grind type testing. A field sample is received taken from a location in a field. A soil subsample is separated from the field sample. The soil subsample is mixed with water, and a soil-water subsample is selected and transferred for testing. The soil-water subsample is measured to determine attributes of the field sample. The field sample may be measured in the field where it was taken, at a local field office located close to the field, or at a remote laboratory. To test remotely, a test well device is prepared which stores a number of soil-water subsamples. Time and cost savings allow for area-based pricing of soil analysis, largely independent of the density at which field samples are tested.