903,008 research outputs found
High voltage assisted mechanical stabilization of single-molecule junctions
The realization of molecular-based electronic devices depends to a large
extent on the ability to mechanically stabilize the involved molecular bonds,
while making use of efficient resonant charge transport through the device.
Resonant charge transport can induce vibrational instability of molecular
bonds, leading to bond rupture under a bias voltage. In this work, we go beyond
the wide-band approximation in order to study the phenomenon of vibrational
instability in single molecule junctions and show that the energy-dependence of
realistic molecule-leads couplings affects the mechanical stability of the
junction. We show that the chemical bonds can be stabilized in the resonant
transport regime by increasing the bias voltage on the junction. This research
provides guidelines for the design of mechanically stable molecular devices
operating in the regime of resonant charge transport
High-voltage distributors
Two distributors reduce high-voltage breakdowns and corona discharges. Both distributors are constructed to prevent air traps and facilitate servicing without soldering. Occurrence of coronas is also minimized due to smooth surfaces of device
High power-high voltage waterload Patent
Variable water load for dissipating large amounts of electrical power during high voltage power supply test
Low-voltage, high-gain, and high-mobility organic complementary inverters based on N,N'-ditridecyl-3,4,9,10-perylenetetracarboxylic diimide and pentacene
This is the pre-peer reviewed version of the following article: PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS 2(2): 47-49, 2008 FULL CITE, which has been published in final form at http://www3.interscience.wiley.com/journal/117862140/abstract.ArticlePHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS. 2(2): 47-49 (2008)journal articl
Technological Aspects: High Voltage
This paper covers the theory and technological aspects of high-voltage design
for ion sources. Electric field strengths are critical to understanding
high-voltage breakdown. The equations governing electric fields and the
techniques to solve them are discussed. The fundamental physics of high-voltage
breakdown and electrical discharges are outlined. Different types of electrical
discharges are catalogued and their behaviour in environments ranging from air
to vacuum are detailed. The importance of surfaces is discussed. The principles
of designing electrodes and insulators are introduced. The use of high-voltage
platforms and their relation to system design are discussed. The use of
commercially available high-voltage technology such as connectors, feedthroughs
and cables are considered. Different power supply technologies and their
procurement are briefly outlined. High-voltage safety, electric shocks and
system design rules are covered.Comment: 39 pages, contribution to the CAS-CERN Accelerator School: Ion
Sources, Senec, Slovakia, 29 May - 8 June 2012, edited by R. Bailey,
CERN-2013-00
High voltage protection network
Circuit protects technical personnel and test equipment from hazardous currents conducted through safety barriers and into data acquisition equipment. Network isolates energy source, restricts arcing to remote area, and dissipates harmlessly residual energy transient
High voltage isolation transformer
A high voltage isolation transformer is provided with primary and secondary coils separated by discrete electrostatic shields from the surfaces of insulating spools on which the coils are wound. The electrostatic shields are formed by coatings of a compound with a low electrical conductivity which completely encase the coils and adhere to the surfaces of the insulating spools adjacent to the coils. Coatings of the compound also line axial bores of the spools, thereby forming electrostatic shields separating the spools from legs of a ferromagnetic core extending through the bores. The transformer is able to isolate a high constant potential applied to one of its coils, without the occurrence of sparking or corona, by coupling the coatings, lining the axial bores to the ferromagnetic core and by coupling one terminal of each coil to the respective coating encasing the coil
High voltage pulse generator
Generator has an improved circuit for generating a controllable, high voltage spark having a constant known energy output. It can be used for testing the flash and ignition characteristics of nonmetallic materials in a controlled gas environment
High-voltage cable Patent
High voltage cable for use in high intensity ionizing radiation field
High voltage power supply
A high voltage power supply is formed by three discrete circuits energized by a battery to provide a plurality of concurrent output signals floating at a high output voltage on the order of several tens of kilovolts. In the first two circuits, the regulator stages are pulse width modulated and include adjustable ressistances for varying the duty cycles of pulse trains provided to corresponding oscillator stages while the third regulator stage includes an adjustable resistance for varying the amplitude of a steady signal provided to a third oscillator stage. In the first circuit, the oscillator, formed by a constant current drive network and a tuned resonant network included a step up transformer, is coupled to a second step up transformer which, in turn, supplies an amplified sinusoidal signal to a parallel pair of complementary poled rectifying, voltage multiplier stages to generate the high output voltage
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