for this purpose. For example, the bias to the class-AB amplifier is switched to low current, when the amplifier amplifier while a lower bias current is applied to "true-Doherty" amplifier. Fig. 4 compares power. By employing bias switching scheme available from the current ...
E-print Network
Combined ab initio and micromagnetic simulations are carried out to build up a direct relationship between critical switching current Jc and geometric structure (in-plane lattice constant a and film thickness) of FePt in magnetic tunnel junctions. Ab initio calculations predict that the strain effect can ...
NASA Astrophysics Data System (ADS)
... SWITCHES, SWITCHING CIRCUITS, SEMICONDUCTOR DIODES, TRIODES, ALTERNATING CURRENT, DIRECT CURRENT, ELECTRICAL ...
DTIC Science & Technology
We studied the possibility of constructing a mechanical persistent current switch using a pair of bulk YBCO superconductors with resin-impregnation. Supercurrents could not be passed between two YBCO bulks when the currents were passed along the c axis. In contrast, supercurrents as large as 13.5 A could be successfully passed between ...
is achieved using traditional current mode PA typologies (Class A/AB) by operating the amplifier several d efficiency (PAE) over current mode PA typologies. The distinct feature of switched mode power amplifiers system PAE is achieved by balancing the distribution of power supply current ...
This letter presents a low-power switched current (SI) memory cell with CMOS-type configuration. By combining nMOS and pMOS in the SI memory cell and using a polarity discrimination circuit, we design a CMOS-type SI memory cell which eliminates the quiescent current in the SI memory cell. The simulation result shows that the CMOS-type ...
... be a viable approach for switching inductive circuits. ... that light-activated opening switches have the ... High current opening switch, Solid state switches ...
Clinical studies have revealed a blunting of the bone anabolic effects of parathyroid hormone treatment in osteoporotic patients in the setting of pre- or cotreatment with the antiresorptive agent alendronate (ALN). Sclerostin monoclonal antibody (Scl-Ab) is currently under clinical investigation as a new potential anabolic therapy for postmenopausal ...
PubMed
... Descriptors : *PATENTS, *SWITCHING CIRCUITS, *ELECTRONIC SWITCHING, DIRECT CURRENT, INVERTERS, ELECTRICAL LOADS ...
... as the switch begins to open. Descriptors : *HYPERVELOCITY GUNS, *PATENTS, *ELECTRIC SWITCHES, ACCUMULATORS, BREECH ...
... current of the bistable switch. ... PHOTOTRANSISTORS, *ELECTRONIC SWITCHES, CONFIGURATIONS ... OPTICAL SWITCHING, MONOLITHIC ...
... operated repetitive high current opening switch is described ... ELECTRODES, *INDUCTANCE, *PATENTS, *SWITCHES, CYLINDRICAL BODIES ...
... AMPLIFICATION, ELECTRIC CURRENT, SWITCHING, RADIOFREQUENCY INTERFERENCE, VOLTAGE REGULATORS, ELECTRICAL LOADS. ...
Linear regulators MOSFET drivers Shunt Current gauges Switching regulators USB switches Serial Battery charging
The electronic transport properties of a naphthopyran-based molecular optical switch are investigated by using the nonequilibrium Green's function formalism combined with first-principles density functional theory. The molecule that comprises the switch can convert between its open and closed forms upon photoexcitation. Theoretical results show that the ...
In current discussions of molecular electronics, the possibility of employing weakly coupled symmetrical bistable molecules or ions which undergo configurational change under external perturbation as molecular switches in hypothetical logic or memory circuits is receiving special attention. For the particular case of switching by an ...
Energy Citations Database
... Actuated Fast-Opening Switches for Very ... current by fast-opening switch mechanisms ... PLASMAS(PHYSICS), *SWITCHING CIRCUITS, *EXPLOSIVE ...
... seconds and that could open against such ... A prototype switch suitable for H ... ENERGY, PROTOTYPES, DRIVES, SWITCHES, VACUUM SWITCHES ...
... Accession Number : ADD007108. Title : Triggered High Current Opening Switch. Descriptive Note : Patent Application,. ...
Brown-Norway (BN) and Dorus Zadel Black (DZB) rats develop a T-cell-dependent membranous glomerulopathy (MGP) with high proteinuria and antiglomerular basement membrane (GBM) autoreactive antibodies (Abs), upon exposure to mercuric chloride (HgCl2). Laminin is an important autoantigenic target of the anti-GBM Abs, absorbing ?30% of ...
PubMed Central
The electronic, magnetic and electric transport properties of a spin valve of the type Cu(111)/ Pt14/(CoPt2)4/Co/(Ni2Co)2/Cu19/(CoNi2)2/Co/Pt14/Cu(111), the indices refering to ML, is investigated using the fully relativistic screened Korringa-Kohn-Rostoker method and a corresponding fully relativistic Kubo-Greenwood equation. Since there is a maximum in the anisotropy energy at a perpendicular ...
We have explored the electronic transport properties of porphyrin-ethyne-benzene conjugates using an ab initio method. The results indicate that these ethyne-bridged phenyl porphyrin molecules can be used as candidates for molecular switching devices. The coplanar conformation of phenyl and porphyrin moieties allows a far larger ...
Persistent infection by pathogenic organisms requires effective strategies for the defense of these organisms against the host immune response. A common strategy employed by many pathogens to escape immune recognition and clearance is to continually vary surface epitopes through recombinational shuffling of genetic information. Borrelia burgdorferi, a causative agent of Lyme borreliosis, encodes a ...
A self-consistent theory of the current-induced switching of magnetization using nonequilibrium Keldysh formalism is developed for a junction of two ferromagnets separated by a nonmagnetic spacer in the ballistic limit. It is shown that the spin-transfer torques responsible for current-induced switching of ...
The Attentional Blink (AB) refers to a decrease in the chance of detecting a second target in a rapid sequence of items if it occurs within approximately 500 ms of a first target. In this study the efficiency of establishing and switching cognitive set for older adults (mean age 71.62 years) relative to young adults (mean age 21.33 years) was investigated. ...
It is proved that it is possible to completely eliminate the ripple component of the load current by interrupting the high frequency current flowing through the triggered main switch at its first zero point. It is also shown that a vacuum switch may be used instead of a high pressure switch for ...
A molecular transistor based on torsion-angle conformation change driven by gate electric field is designed and studied using ab initio calculations. This transistor consists of a SH-C6H2F(CH3)C6H2(CH3)F-SH molecule sandwiched between two Au(111) electrodes, where the interaction between the molecular dipole and a gate voltage induced electric field will cause the molecule to ...
The current switching by means of a gas-filled electron switch has been studied experimentally and theoretically. Under deep volume charge compensation conditions the switch showed complete controllability. The switched current density was more than ...
The current switching by means of a gas-filled electron switch has been studied experimentally and theoretically. The switch showed complete controllability under deep volume charge compensation conditions. The switched current density was an order of magnitude higher than ...
A low inductance gaseous switch tube has been designed and tested which permits high current (>150,000 amp) switching of power at potentials up to 20 kv without deterioration of electrodes due to current pinching. The switch is so designed that triggering...
National Technical Information Service (NTIS)
The need for a reliable and effective commutating switch is essential to the operation of an HPG-driven railgun system. This switch must offer the lowest possible resistance during the current build up time and then must commutate the current quickly and efficiently into the railgun barrel. This paper considers the ...
Several ac static switches utilizing various semiconductor devices were studied ... thyristors when used for alternating-current switching. ...
NASA Website
... GROUP Opening switches, Plasma erosion opening switches Anomolous transport in ... phase of the plasma erosion opening switch (PEOS), current ...
the mechanical action vacuum switch will suffice. The peak current requirement for switch ... Corporation, Jennings Company, vacuum switch model, number ...
An improved photoconductive semiconductor switch comprises multiple-line optical triggering of multiple, high-current parallel filaments between the switch electrodes. The switch can also have a multi-gap, interdigitated electrode for the generation of additional parallel filaments. Multi-line triggering can ...
DOEpatents
... Defense (DoD) Issuances (current and cancelled ... to a Boolean algebra procedure that ... SWITCHING CIRCUITS, *ALGEBRAS), (*COMPUTER LOGIC ...
Only two of four switches interrupt substantial current. An asymmetric timing scheme improves design
NASA Technical Reports Server (NTRS)
... phase of the plasma erosion opening switch, the current ... Descriptors : *ELECTRIC SWITCHES, *PLASMA DEVICES, ACOUSTICS, ANOMALIES ...
The discovery of the new high temperature superconductors has revived interest in many special applications, including superconducting switches. For comparison of switch types, a simple figure of merit based in switch performance is proposed, derived for superconducting switches, and then calculated for thyristors ...
The High Current Thyristor (HCT)-1400 was characterized for switching performance. This is a Soviet switching device that has recently become available to the U.S. community. Substantial claims have been made regarding the performance of this switch. In particular, the switch was claimed to be ...
DOE Information Bridge
impedance (active, caused by contacts and wires, or inductive, caused by the length of ... switch are not degrading after application of multiple high- current pulses. .... switching pulse applied to the gate of the FET used to initiate the ... opening of the switch, thus allowing bleeding of the ...
The paper presents three persistent-current switches which were developed for superconducting coils on Maglev vehicles. Superconducting wire is used for the switches whose electric resistances are 100 ohms off-state (normal state), and current capacities ...
In order to model electronic transport properties of atomic and molecular scale nanoelectronic devices and nanostructures under external bias and gate potentials, we have developed a self-consistent ab initio method by performing density functional theory (DFT) analysis within the Keldysh nonequilibrium Green's functions (NEGF) formalism. This DFT-NEGF approach allows us to ...
An overview of the current understanding of ozone depletion chemistry, particularly with regards the
... & D pour la défense Canada � Toronto 19-18 Method: Procedure � Participants performed the tasks in pairs of trials � Terrain model and AB points ...
... POWER EQUIPMENT, *REMOTE CONTROL, *SWITCHING CIRCUITS, POWER SUPPLIES, ELECTRIC CURRENT, DIRECT CURRENT, SOLID ...
High current switching devices - development of mathematical models representing energy conversion
... Accession Number : ADA150987. Title : Current Distribution in a Plasma Erosion Opening Switch. Descriptive Note : Memorandum rept. ...
This paper presents a SPICE macromodel for a 1-megawatt high power electrical switch which uses power MOSFETs as the active switching elements. The model accurately predicts the time dependent switching current and provides a reasonable representation of the time dependent switch resistance and ...
This paper presents a SPICE macromodel for a 1-megawatt high power electrical switch which uses power MOSFET's as the active switching elements. The model accurately predicts the time dependent switching current and provides a reasonable representation of the time dependent switch resistance ...
A theoretical model for the plasma erosion opening switch (PEOS) is presented which predicts its voltage, current and impedance history as a function of the input waveforms, geometry and switch parameters. Scaling laws for the switch operation are develop...
The persistence switch comprises a diode and superconductive wire in thermal contact with the diode. The heat evolved by current through the forward biased diode raises the temperature of the superconductor above the transition temperature. The diode characteristic of the switch permits a plurality of such switches ...
The general objective of this program has been to design a switch suitable for use in inductive energy storage power supplies. This switch consists of two major components, one for inductor charging (bypass switch) and one for high voltage direct current ...
A system for current efficient dynamic power range control in a transmitter lineup can include a switched mixer coupled to a switched step attenuator and a switched power driver coupled to the switched step attenuator. Linearity and efficiency can be subs...
The current density of the resistance switching of the Pt nanogap electrode was investigated to determine the nature of the electromigration responsible for the switching. The current density that is estimated from the measured current and emission area calculated using the tunneling equation ...
, and therefore the actual current delivered to the load is regulated by opening and closing the transistor switch, when the switch is turned off (opened), the diode is forward biased, and most of the current i(t) flows. In order to study the load current i(t), it is reasonable to assume that ...
A new concept of switching of high currents using intense relativistic electron beams propagating in vacuum drift tubes is presented. Some possible applications of this concept for the design of current switches are discussed. Supporting analytical one-dimensional theory of an electron beam ...
appears at the outputs directly connected to the switch. Now switch sw1 is open, and supply current is opened. However, without additional measures, no current flows through the closed switches in case I switch openswitch open switch closed ...
... of Defense (DoD) Issuances (current and cancelled ... Test of A/B Regulator Performance During ... by the airborne tank pressure regulators to assure ...
The novel ARCP scheme soft switching inverter without smoothing capacitor in the input DC voltage side is proposed in this paper. The proposed ARCP soft switching inverter can achieve the zero voltage soft switching transition in the main switch, and the zero current soft ...
The energy deposited in a switching element is dominated by the ohmic resistance, the current and the duration of the current pulse. The paper presents measurements of the resistance of a gas discharge switch and projectile armatures. The measurements hav...
The feasibility of using an external magnetic field to cause the blocking of reverse conduction in a vacuum switch was investigated. The design and build of a test switch was followed by a program of experimental work during which magnetic fields were app...
switching, and multiconverter techniques are reviewed as to their principle of operation. .... develops a proportional current in the current generator, which supplies .... Switched-mode power converters with high switching frequencies and ... Some novel topological modifications are ...
The application of magnetic current amplification and switching techniques to the generation of precise high current pulses for switching magnets is described. The square loop characteristic of Metglas tape wound cores at high excitation levels provides e...
The patent application describes a modular opening switch for high currents providing high current-carrying capacity, high voltage hold-off capability and very short opening time. The switch operates on the principle of an explosively generated pressure w...
The transfer of energy from superconducting magnet coils with currents of 10,000 A or more with stored energy of 300 kJ or more using superconducting switches is discussed. Switching is done by driving the device to its normal resistive state by current p...
Characteristics of current filamentation are reported for high gain photoconductive semiconductor switches (PCSS). Infrared photoluminescence is used to monitor carrier recombination radiation during fast initiation of high gain switching in large (1.5 cm...
Low pressure switches and magnetic switches were tested as possible replacements for the high pressure switches currently used on Experimental Test Accelerator and Advanced Test Accelerator. When the low pressure switch is used with a low impedance transmission line, runaway electrons form a ...
Laboratory performance of mercury-filled current limiting devices (CLD) used for high speed switching of dc circuits (600 volts and below, up to 1,000 amperes) using a system involving a parallel connected vacuum switch with CLD and an additional series connected vacuum switch was verified. The report details ...
Scaling experiments have been performed on an explosively activated plasma opening switch. Current density and choice of explosive apparently are the most important variables in determining switch performance. Granular nitroguanadine, Octol, and Comp B3 explosives provide the fastest switching times. Granular ...
... COMPOUNDS, CRYOGENICS, TEMPERATURE, CRYSTAL STRUCTURE, OXIDES, VOLTAGE, ELECTRIC CURRENT, NIOBIUM COMPOUNDS ...
... Acoustic Excitation of Magnetoelastic Waves in Ferrites ..... 54 ... CONTENTS C-Band Ferrite Switch ..... 79 ...
