Results 201 to 210 of about 361,997 (252)
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High-current space-charge-limited pulses using ultrashort laser pulses
Physical Review E, 2022The maximum current that can be delivered by a 1-D vacuum diode is limited due to the space-charge reduction of the accelerating field. For a steady-state operation, this is given by the Child-Langmuir space-charge limit. However, for pulsed diode sources, the instantaneous current can be much higher than this limit, as long as the pulse length is much
Channprit Kaur +2 more
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Surface roughening in pulse current and pulse reverse current electroforming of nickel
Surface and Coatings Technology, 1997Abstract Electrodeposition of metals to the thickness required for electroforming inevitably results in roughening of the deposited surface. Although in some cases, post machining can be adopted to improve the texture of deposited surfaces, it is not feasible for micro-electroformed components because of their small size.
N.S. Qu, K.C. Chan, D. Zhu
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Simple pulse current transformer to check magnetron pulse current
Journal of Scientific Instruments, 1967A simple pulse current transformer can give more faithful pulse reproduction and avoid the problems inherent in the conventional series-resistance circuit to measure magnetron pulse current. The design equations for such a transformer are given and a practical unit to measure 6-10 A pulses of 0.05-2 μsec duration in a 15 kv magnetron pulser is ...
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Superconducting Current Leads Under Pulsed Current Conditions
IEEE Transactions on Applied Superconductivity, 2019Cryogenic superconducting devices such as a Superconducting Magnetic Energy Storage device can require current leads that must operate under conditions where the current is delivered in pulses. The focus of this paper was to observe the electrical and thermal behavior of conduction-cooled superconducting current leads in hopes to develop a better ...
Tyler W. Hanzlik +3 more
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Current adder with programmable pulse shaping
2007 16th IEEE International Pulsed Power Conference, 2007Advancements in fusion research and Equation of State (EOS) experiments have led to a need for greater control over the shape of the current waveform in the load. This added complexity will necessitate more sophisticated pulsed power designs. Challenges introduced by these new systems include the requirement for more elaborate control systems to ...
F. E. White +3 more
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Pulsed eddy current thermography: system development and evaluation
Insight - Non-Destructive Testing and Condition Monitoring, 2010There is a need for fast and efficient techniques to inspect engineering structures and complex components such as aircraft turbine blades to identify potential sites of failure. Pulsed eddy current (PEC) thermography is a new inspection technique which allows the user to capture the eddy current distribution in a component or structure using infrared ...
Wilson J +4 more
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A low current pulsed ablation plasma thruster
10th Electric Propulsion Conference, 1973Theme A type of ablation plasma thruster has been investigated which delivers small impulse bits of 10-100 juN-sec at a msec pulse duration. The high impedance of the device is such that operation from a low-weight electrolytic capacitor is possible. Though the plasma exhaust velocity is high (9 km/sec) the dominant accelerating mechanism is not of the
L. LlEBING, F. SEIDEL
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1994
Abstract Pulsed-current plating can be defined simply as metal deposition by pulsed electrolysis, which involves using interrupted direct current to electroplate parts. This article discusses the advantages and limitations of pulsed-current plating and provides information on the process principles and control, solution composition ...
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Abstract Pulsed-current plating can be defined simply as metal deposition by pulsed electrolysis, which involves using interrupted direct current to electroplate parts. This article discusses the advantages and limitations of pulsed-current plating and provides information on the process principles and control, solution composition ...
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Pulsed Eddy Current Thermography and Applications
2011In this paper we report on the application of the pulsed eddy current thermography inspection technique to the detection and quantification of defects in a variety of materials. After introducing the appropriate modelling and simulation techniques an overview of a typical PEC thermography system setup is provided.
Tian, GY +5 more
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Restoring rectangular pulses of stimulation current
Electroencephalography and Clinical Neurophysiology, 1966Abstract The extensively used rectangular pulses for electrical stimulation of laboratory animals are greatly distorted when applied to thin wire electrodes. The large current densities present at the electrode tips cause a capacitive behaviour of the metal-electrolyte interface.
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