54 results about "Pulse polarity" patented technology

A method, system, and an apparatus for providing a multi-phasic stimulation signal for an implantable device are provided. An electrical pulse with a first characteristic that includes a first pulse width, a first pulse amplitude, a first pulse polarity, or a first pulse shape, is applied during a first time period to a portion of a vagus nerve using an implantable device. A controlled modification of the first characteristic of the electrical pulse is performed. The controlled modification is performed to provide a second characteristic for the electrical pulse during a second time period. The electrical pulse with the second characteristic is applied to the target portion of the vagus nerve.

Efficient use of multi-coil arrays for magnetic nerve stimulation depends upon coordinating the coil polarity, the pulse phase and the pulse timing. Monophasic magnetic nerve stimulators produce more precise and predictable results in the stimulation of nerves than biphasic and polyphasic machines, but are less electrically efficient, and consequently limited in terms of pulse train speed. The present invention concerns the coordination of pulse polarity, phase, timing, and strength between multiple magnetic stimulation coils. The goal is to optimize the manner in which multiple coils may be used synergistically to control the activity of underlying neural tissue.

A method eliminates spectral lines and shapes the power spectral density of an ultra bandwidth signal. First, a train of pulses is generated. The pulses are then modulated in time according to symbols. A polarity of the pulses is inverted randomly before transmitting the pulses as an ultra wide bandwidth signal.

The embodiment of the invention provides a TIG welding method applicable to moderately thick aluminum alloy. On the condition that beveling is not carried out, the effect of single-face welding and two-face forming effect is achieved. The connector mechanical property and welding efficiency can be greatly improved. The aluminum alloy TIG welding method is used for welding a weld joint between two workpieces and comprises the steps that an outer pressing block is adopted on the front faces of workpieces to be welded, a welding base plate with a welding leakage groove is arranged on the back faces of the workpieces to be welded to tightly support the workpieces, and therefore a weld joint to be welded of the two workpieces to be welded is right opposite to the center of the welding leakage groove; the two steps of backing welding and cosmetic welding are carried out, wherein the TIG welding is adopted for carrying out backing welding on the weld joint to be welded, so that welding leakage is formed on the back face of the weld joint to be welded, and direct forming is achieved; pulse polarity variation TIG welding is adopted for carrying out cosmetic welding.

A method eliminates spectral lines in a time hopping ultra wide bandwidth signal. First, a train of pulses is generated from input symbols. The pulses are then modulated in time according to symbols. The modulation can use pulse position modulation and time hopping. A polarity of the pulses is inverted randomly before transmitting the pulses as an ultra wide bandwidth signal. By randomly inverting the polarity of the pulses spectral lines in the ultra wide bandwidth signal are eliminated.

Systems and methods are provided for graphically configuring leads for a medical device. According to one aspect, the system generally comprises a medical device and a processing device, such as a programmer or computer, adapted to be in communication with the medical device. The medical device has at least one lead with at least one electrode in a configuration that can be changed using the processing device. The processing device provides a graphical display of the configuration. In one embodiment, the graphical display graphically represents, illustrates or displays the lead(s), the electrode(s), a pulse polarity, and a vector. According to another aspect, the method generally comprises receiving information for a medical device having at least one lead with at least one electrode in a configuration, and presenting a graphical representation of the configuration on a display. According to other aspects, a device and a computer-readable medium encoded with a software program for providing a graphical display of a lead configuration for an implantable medical device are also provided herein.

A variable resistance nonvolatile memory element manufacturing method includes: forming a first electrode on a substrate; forming a first metal oxide layer having a predetermined oxygen content atomic percentage on the first electrode; forming, in at least one part of the first metal oxide layer, a modified layer higher in resistance than the first metal oxide layer, by oxygen deficiency reduction; forming a second metal oxide layer lower in oxygen content atomic percentage than the first metal oxide layer, on the modified layer; and forming a second electrode on the second metal oxide layer. A variable resistance layer includes the first metal oxide layer having the modified layer and the second metal oxide layer, connects to the first electrode and the second electrode, and changes between high and low resistance states according to electrical pulse polarity.

A method and system for storing and transmitting data using variable pulse characteristics to represent ASCII or UNICODE characters, of the value of a string of data using a number base higher than 2. Pulse characteristics are modified to correspond to different data values. Pulse characteristics can include pulse durations, pulse spacings, pulse amplitudes, pulse phases, pulse polarities, pulse shapes and/or other pulse characteristics.

The invention relates to a surface plasmon DC pulse attitude control and propulsion assisting system for a hypersonic aircraft, and belongs to the technical field of aircraft power. Four pairs of electrode strips arranged at upper, lower, left and right parts are vertically spaced apart and embedded in the outer surface of the aircraft in the motion direction; each pair of electrode strips consists of an IN1 electrode strip and an IN2 duality electrode strip; propulsion assisting and attitude control can be realized by virtue of surface plasmon DC pulses of the aircraft; two sets of DC pulse plasmon drives are driven; the surface of the hypersonic aircraft is divided into four parts comprising the upper, lower, left and right parts; each of the parts is provided with two kinds of electrodes which are IN1 and IN2 electrodes; the two electrodes of each set are contrary to each other in voltage, pulse and polarity; and a double-DC pulse plasmon drive is driven. A DC pulse plasmon driven PWM modulation system takes an AT89S52 single-chip microcomputer as a control core, and consists of a command input module, an LED display module and a DC pulse power amplification drive module, thereby realizing digital precision control, completely changing the propulsion mode of the aircraft, saving more energy, eliminating the source of surface resistance of the aircraft in principle, and achieving great development potential.

The invention provides a power-frequency synchronization depth storage ns-grade pulse multi-parameter generation system, comprising a computer, a waveform storage module in electric connection with the computer, a numerical-control pulse signal generation module and a power-frequency synchronization trigger module, wherein the numerical-control pulse signal generation module and the power-frequency synchronization trigger module are electrically connected with the waveform storage module, and the power-frequency synchronization trigger module is electrically connected with the numerical-control pulse signal generation module. By means of the power-frequency synchronization depth storage ns-grade pulse multi-parameter generation system of the invention, pulse amplitude, pulse rising time, pulse fall time, pulse polarity, the number of pulses, pulse repetition frequency and pulse trigger phase are set via the computer, and the power-frequency synchronization trigger module is further controlled to trigger the numerical-control pulse signal generation module at the set phase, thereby realizing power-frequency synchronization, standard pulse generation, low cost and high convenience and efficiency. The precision of signal output is guaranteed, complicated control-panel operation is avoided, and the problem of the prior art of single function is solved.

The invention relates to a large generator partial discharge on-line monitoring anti-interference method, comprising the steps of: 1) installing a VHF capacitive sensor at the three-phase outlet busbar of a generator, installing a high-frequency current sensor on a neutral grounding line, and connecting the VHF capacitive sensor and the high-frequency current sensor to a partial discharge monitoring device through high-frequency coaxial lines; 2) using an analog partial discharge pulse generator to input the discharge pulses into different positions, starting a monitoring host to transmit a command to the partial discharge monitoring device, synchronously acquiring all sensor signals, finding out the corresponding pulse of the high-frequency current sensor channel at the same time according to the pulse of a VHF capacitive sensor channel, and determining the position of a pulse discharge source by the pulse polarities of the two signals. The method can filter out the various pulse interferences transmitted from the grounding line direction and the high-voltage busbar direction, in particular various random impulse interferences which are the most difficult to filter out.

The invention discloses a DC arc fault detection and positioning method based on a pulse polarity characteristic distribution spectrogram. The DC arc fault detection and positioning method comprises the following steps: step one, connecting coupling capacitors in parallel to all branches in a DC power distribution network system; step two, generating series or parallel arc faults at different positions in the DC power distribution network system, detecting the current of each branch capacitor, and then performing discrete wavelet transform on the current of each branch capacitor to obtain capacitive current spectrum ranges at different positions and of different fault types; step three, drawing a characteristic distribution spectrogram according to the capacitive current spectrum ranges and the capacitive current pulse polarities of different positions and fault types; and step four, under the condition that a to-be-processed system generates an arc fault, acquiring the capacitive current spectrum distribution range and the current pulse polarity information of each branch in the to-be-processed system, and determining the type and the position of the arc fault of the to-be-processed system by utilizing the characteristic distribution spectrogram. Therefore, the direct current arc fault of the power system can be detected and located.

The invention discloses a high-frequency ultra-short electron gun grid regulation and control pulse power supply system, which mainly comprises the following four schemes: a high-frequency ultra-shortelectron gun grid regulation and control pulse power supply system for generating voltage-multiplying pulses, a high-frequency ultra-short electron gun grid regulation and control pulse power supplysystem for directly generating high-frequency ultra-short pulses, a high-frequency ultra-short electron gun grid regulation and control pulse power supply system for generating frequency-multiplying and phase-adjustable pulses, and a high-frequency ultra-short electron gun grid regulation and control pulse power supply system for directly generating polarity and phase-adjustable pulses. Output ofvoltage-multiplying pulses, high-frequency ultra-short pulses, frequency-multiplying and phase-adjustable pulses and polarity and phase-adjustable pulses is realized respectively.

A display device selects one or more of first electrodes corresponding to image data using a general-purpose segment driver and applies predetermined voltages respectively to the first electrodes of selection targets and non-selection targets. A driver control circuit outputs, according to a pulse polarity control signal, inverted image data or un-inverted image data to a segment driver. The segment driver applies voltage to second electrodes based on the image data acquired from the driver control circuit.

A synchronization method for impulse system ultra-wideband takes frame as basic unit for data transmission, each frame is divided into a preamble symbol part and a data part, wherein the preamble symbol part sends a known impulse sequence for channel estimation and synchronization; the data part takes the information to be transmitted; the preamble symbol part is divided into two parts of a positive and negative impulse sequence and a same direction impulse sequence, the front is the positive and negative impulse sequence, which includes odd impulses with alternant positive and negative polarities; the rear is the same direction impulse sequence, which is composed of impulses with same polarity, and the polarity of impulse in the same direction impulse sequence is same as the polarity of the last impulse in the positive and negative impulse sequence. Compared with the synchronization method in a high-speed sampling and low-precision quantification pulse system ultra-wideband wireless communication system, the method provides such advantages as high synchronization precision, small storage space, and capability of immediately finding out the synchronization position etc., and provides an important value for the development of the impulse system ultra-wideband wireless communication technique.

The invention discloses a digital formation echo signal emulator, which comprises the following parts: inner synchronizing signal output source, DDS integrated circuit, controller and multiplier, wherein the inner synchronizing signal output source connects the controller electrically, which provides a synchronizing pulse to the external equipment; the synchronizing pulse polarity and pulse breadth can be set according to the need; the DDS integrated circuit adjusts the amplitude of output signal; the controller sets the output signal frequency of DDS integrated circuit through the control line and outputs an analog signal to control sine wave amplitude of DDS integrated circuit, which sends the control signal of position information for analog multiplier; the input of multiplier contains two paths; one path comes from the output of DDS integrated circuit; the other path come from the position information control signal of controller; the multiplier proceeds the multiplication calculation of two paths, which outputs the signal.

The invention provides a pulsed magnetron sputtering and ion implantation combined composite surface modification method and device. The pulsed magnetron sputtering and ion implantation combined composite surface modification method comprises the following steps of: firstly, generating plasma required for composite surface modification by using the pulsed magnetron sputtering; changing the pulse polarity at the end of the magnetron sputtering pulse, so that ions in the plasma still remaining in a vacuum chamber accelerate towards a direction departing from a target; and using a substrate as anegative electrode or placing the substrate on the path of ion bombardment to realize the composite surface modification of the substrate. The pulsed magnetron sputtering and ion implantation combinedcomposite surface modification method and device can improve the affinity of the substrate material to a thin-film material and the bonding force between a film layer and the substrate, can control the structure of the film, and can change the composition structure of a coating or the substrate before and after magnetron sputtering deposition film formation.

The invention discloses a method and device for generating a first-order ultra wide band signal with adjustable single-wave-length full gloss. Gaussian optical pulse with the positive polarity is utilized for obtaining Gaussian optical pulse with the positive polarity and the negative polarity on the same wave length through optical logic inverters of double ports, and after delaying and combination, the full gloss first-order ultra wide band signal with the single-wave-length is output. The pulse width and radio frequency spectrum of the generated signal are turnable, and the positive polarity and the negative polarity of pulse can be switched. The device is simple in structure, convenient to operate and low in implementing cost, can achieve the functions of the turnable pulse width, a turnable radio frequency spectrum and the switchable pulse polarity, and achieves better practical value and practical operability.

The invention discloses a generation device and method for a wide-range reconfigurable UWB (Ultra-Wideband) based on cascaded DE-MZMs (Dual-Electrode Mach-Zehnder Modulators), belongs to the technical field of the ultra-wide band and aims at generating any first-order to fifth-order UWB signals and realizing adjustable pulse polarity, under the condition of not changing a system structure. The device comprises a laser, an optical coupler, a first-level DE-MZM, a second-level DE-MZM, a Gaussian pulse signal generator, a first photoelectric detector, a second photoelectric detector and an amplifier. The laser is connected with the optical coupler. According to the method, the continuous light generated by the laser passes through the optical coupler and then is divided into two ways; Gaussian pulse signals are attenuated and delayed and then are respectively input into two arms of the first-level DE-MZM; the signals at two arms of the first-level DE-MZM are converted into electric pulses by the first photoelectric detector; the signals are amplified, attenuated and delayed by the amplifier and then are input into the two arms of the second-level DE-MZM for secondary modulation; and after the modulation, the signals are output.

The invention relates to a high-voltage ignition device of a 20-pulse multi-waveform impact generator. A 20-pulse controllable timer, a 20-pulse polarity controller and a 20-pulse voltage booster are all connected to a 20-pulse silicon stack trigger. The 20-pulse silicon stack trigger is connected to a 20-pulse sparking plug, and a lithium battery is connected to the 20-pulse voltage booster. The 20-pulse polarity controller controls the ignition polarity of the 20 sparking plug. Direct current is oscillated again into alternating current by the lithium battery through an oscillating circuit according to the discharge frequency. The alternating current obtained after oscillating is subjected to voltage boosting through the 20-pulse voltage booster, and the high voltage capable of ionizing air is achieved. According to the 20-pulse silicon stack trigger, controllable breakover silicon stacks are triggered and broken over through 20 pulses, and the output triggered current passes through the voltage booster to reach the high voltage capable of ionizing air and then is conducted to the sparking plugs. According to the high-voltage ignition device, multi-path ignition is achieved, 20 paths are achieved, and multi-sequence control is the difficulty and stress; and each discharge device can independently control the discharge sequence, and can independently carry out testing.