pulses (Total 8850 Patents Found)

Pulses (8850 Patents Found)
A circuit for generating scanning pulses comprising a plurality of stages of basic circuits connected in series, said each basic circuit comprising first, second and third insulated gate field-effect transistors (MISTs) each of which has first and second terminals each being either of source and drain terminals and a g...
A method for producing a spatially and spectrally selective radiofrequency (“RF”) excitation pulse includes establishing a desired spatial RF excitation pattern and establishing a desired spectral RF excitation pattern. The method also includes estimating an RF transmission profile map indicative of the transmissio...
An instrument 10 for delivering a high voltage pulse to tissue is disclosed. The instrument 10 can include an outer support member 12 with a liquid reservoir 14 that has a liquid-contacting interior surface 16 , an opening 18 at a distal end 20 of the outer support member 12 , and a ground electrode 22 ...
Embodiments of the present invention generally relate to high energy, ultrashort pulses from a net normal dispersion ytterbium fiber laser with an anomalous dispersion higher-order mode fiber. More specifically, embodiments of the present invention relate to a fiber oscillator with all-fiber dispersion compensation del...
A device and a process for enabling an incident wide bandwidth (greater than about 1 GHz) short duration (less than about 10 microseconds) individual pulse of electromagnetic radiation to be digitally sampled at a sampling rate that is achievable by available digital sampling circuits. The incident pulse is modulated o...
An auxiliary insert MRI gradient coil is used to produce intense auxiliary magnetic gradient pulses during MRI sequences to improve MRI system performance. Although the auxiliary gradient coil may be of considerably reduced dimensions, thus, having considerably reduced uniformity, linearity and/or reproducibility than ...
In a TV answer back system where many receiver stations communicate with a TV transmitter station by means of rf pulses generated by rf oscillators at the receiver station, the requirement for keeping all oscillators on frequency is achieved without crystal temperature control by automatically controlling the rf oscill...
A method of controlling output pulses of a pulse laser device ( 100 ) including thin-disk laser medium ( 10 ), in particular controlling a carrier-envelope phase and/or an intensity noise of the output pulses, includes pumping thin-disk laser medium ( 10 ) of pulse laser device ( 100 ) with multiple pump laser diodes (...
Methods and systems for releasing growth factors are disclosed. In certain embodiments, a blood sample is exposed to a sequence of one or more electric pulses to trigger release of a growth factor in the sample. In certain embodiments, the growth factor release is not accompanied by clotting within the blood sample....
A circuit for the comparative vector measurement of keyed radio signal pulses, in particular DME pulses which arrive virtually simultaneously in a plurality of receivers and which can exhibit large level differences is utilized where, in each receiver, the pulses are fed to a switching amplifier which has an amplificat...
A system based on the magnetic compression of ion rings, for generating intense (high-current), high-energy ion pulses that are guided to a target without a metallic wall or an applied external magnetic field includes a vacuum chamber; an inverse reflex tetrode for producing a hollow ion beam within the chamber; magnet...
A magnetic resonance imaging apparatus includes an imaging condition setting unit and an image data acquisition unit. The imaging condition setting unit sets an imaging condition applying first and second suppression pulses of which at least ones of types, center frequencies and frequency bands are different from each ...
A magnetic resonance imaging apparatus includes an imaging unit and a compensation unit. The imaging unit acquires image data by imaging that applies a pre-pulse for controlling contrast. The compensation unit suppresses a remnant magnetic field having an intensity according to slice position. The remnant magnetic fiel...
A circuit arrangement for generating light pulses includes an electro-optical converter; a switching element; and a charge store. The electro-optical converter is connected to the charge store via the switching element. The closing of the switching element triggers a discharging process in the charge store and, in the ...
An HPEM module ( 1,10 ) is provided, wherein the output pulse or the trigger pulse is transmitted on a single input trigger pulse (Trigger 2, 11 ) with an intermediate TTD network ( 5, 14 ) in a phase-defined and time-defined manner independent of frequency depending on the selected input of the electromagnetic lens v...
A recording apparatus for recording on a recording medium includes plural heat generation-activated recording elements, and a discrimination circuit for discriminating the waiting time between the termination of a first recording operation and beginning of a second recording operation. Control circuitry is provided for...
The present invention provides a system and method for ultrasound pulse shaping and output power adjustment using multiple drive pulses. The multiple drive pulses are width modulated to provide the required output signal power and wave-shape characteristics. Using multiple width-modulated pulses provides control over p...
Digital focal plane arrays (DFPAs) with multiple counters per unit cell can be used to convert analog signals to digital data and to filter the digital data. Exemplary DFPAs include two-dimensional arrays of unit cells, where each unit cell is coupled to a corresponding photodetector in a photodetector array. Each unit...
When a mechanical frame or gantry is used to move one or more electromagnets about a subject, the pulsed magnetic fields of the magnets need to be triggered, but only when the coil is in an appropriate physical position. Trigger points are established along the movement pathway (e.g., along the support frame) for the e...
Pulses having a pulse width equal to one-quarter wavelength at a multiple (including 1) of the fundamental frequency of the pulses are applied to the test coil assembly of a pulse eddy current testing apparatus, and the output signals are supplied to an amplifier tuned to said multiple of the fundamental frequency. The...
The invention relates to the measurement of current pulses that are very brief (a few nanoseconds) and of very low amplitude (a few microamps), such as those that can emanate from a photodetector used for the optical transmission of data at very high speed, or from a photodetector (photodiode or photoconductor) subject...
Disclosed is a head positioning control system and control method for a storage device which maintains the high speed and high density of head positioning and simultaneously lightens the load of the microprocessor or other control circuit used for the head positioning to enable realization by an inexpensive control cir...
A rotatable switch having a printed circuit part including a plurality of conductive elements connected to terminals, which in turn may be connected to sources of operating potential. Two of the conductive elements cooperate with contacts of a rotatable switch part to produce electrical pulses, while other conductive e...
The specification discloses a correlator for identifying sequences of pulses which includes a random access memory having a plurality of parallel storage cells for storing pulse correlation data. A clock generates periodic clock signals and a pointer sequentially addresses the storage cells in dependence upon the clock...
An improved technique for acoustic sensing involves, in one embodiment, launching into a medium, a plurality of groups of pulse-modulated electromagnetic-waves. The frequency of electromagnetic waves in a pulse within a group differs from the frequency of the electromagnetic waves in another pulse within the group. The...
A method and structure for depinning a domain wall that is in spatial confinement by a pinning potential to within a local region of a magnetic device. At least one current pulse applied to the domain has a pulse length sufficiently close to a precession period of the domain wall motion and the current pulses are separ...
At least one exemplary embodiment of the present invention includes a method comprising obtaining a first frequency and a second frequency. The method also comprises creating a table of values comprising a plurality of target frequencies intermediate to the first and second frequencies, the table of values also compris...
1,013,131. Pulse ratemeters. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. March 22, 1963 [March 29, 1962], No. 12196/62. Heading H3A. A pulse ratemeter of constant discriminating power comprises a storage capacitor C2 charged by incoming pulses V and discharged by a current I at a constant rate independent of the incoming p...
本发明涉及一种用于超快脉冲时域波形测量的装置,包括微波信号源、飞秒脉冲激光器、光导探针、同轴到共面转换器、共面波导和锁相放大器;所述微波信号源为超快脉冲产生器和飞秒脉冲激光器提供微波信号源,使超快脉冲产生器产生超...
The electrochemical machining of long grooves in the surface of metal workpieces uses d.c. pulses with a pulse length of less than the time required for the passage of the electrolyte through the working gap. At the end of every working pulse, a pause which is sufficient for the gap flushing is interposed. This prevent...