A5002914405- Electromagnetic Compatibility and Noise Suppression
- Combustion and Detonation Processes
- Plasma Diagnostics and Applications
- Energetic Materials and Combustion
- Laser-Plasma Interactions and Diagnostics
- Microwave Engineering and Waveguides
- Particle accelerators and beam dynamics
- Electromagnetic Simulation and Numerical Methods
- Nonlinear Dynamics and Pattern Formation
- Electrostatic Discharge in Electronics
- Electromagnetic Scattering and Analysis
- Nonlinear Photonic Systems
- Twentieth Century Scientific Developments
- Electromagnetic Compatibility and Measurements
- History and advancements in chemistry
- Electron and X-Ray Spectroscopy Techniques
- Magnetic confinement fusion research
- Advanced Fiber Laser Technologies
- Gyrotron and Vacuum Electronics Research
- Cryptographic Implementations and Security
- Low-power high-performance VLSI design
- Electromagnetic Launch and Propulsion Technology
- Statistical Mechanics and Entropy
- Advanced Thermodynamics and Statistical Mechanics
- High-Velocity Impact and Material Behavior
University of New Mexico
1985-2021
United States Air Force Research Laboratory
2009-2010
Kirtland Air Force Base
1979-2009
University of Dayton
2005
Stevens Institute of Technology
2004
The Ohio State University
2001
United States Navy
1975
We have magnetically driven a tapered-thickness spherical aluminum shell implosion with 12.5 MA axial discharge. The initially 4 cm radius, 0.1 to 0.2 thick, \ifmmode\pm\else\textpm\fi{}45\ifmmode^\circ\else\textdegree\fi{} latitude was imploded along conical electrodes. time approximately 15 \ensuremath{\mu}sec. Radiography indicated substantial agreement 2D-MHD calculations. Such calculations for this experiment predict final inner-surface velocity of 2.5 3 cm/\ensuremath{\mu}sec, peak...
We carry out a detailed bifurcation analysis for common class of electrostatically driven nanowires in multiphysics model. A finding is that the nanoscale system can exhibit distinct chaotic states: chaos with symmetry breaking and extensive possessing full system. Potential applications such as random number generator controlling to achieve desirable performance are articulated.
Experimental evidence of intrinsic localized modes (ILMs) in microelectromechanical oscillator arrays has been reported recently. In this paper, we carry out a detailed analysis new mechanism for ILMs typical experimental settings; that is, spatiotemporal chaos is ubiquitous and it provides natural platform actual realization various through frequency control. We find unstable periodic orbits associated with are pivotal to arise these the keys stabilizing by modulation.
The ability to understand and predict the effects on electronic systems that might result from an intentional EMI attack is of great importance in defending critical against such a threat. In this paper we focus predicting response microcontroller high-power electromagnetic waveform. We will describe our approach present results experimental investigations as well modeling different microcontrollers direct injection RF signal into clock lines. addition, discuss how these may be extended case...
AbstractAbstractElectromagnetic implosions of shaped cylindrical aluminum liners that remain at solid density are discussed. The approximate liner parameters have an initial radius 3 to 4 cm, cm in height, and ∼0.1 thick. driven by the Shiva Star 1300-µf capacitor bank 84-kV charging voltage ∼30-nH total inductance (including implosion load). discharge current travels along length rises 14 MA ∼8 µs. time is ∼12 Diagnostics include inductive capacitive probes, magnetic radiography. Both...
The analytical solution of the system coupled ordinary differential equations which describes time evolution an ideal coaxial plasma gun operating in snowplow mode is obtained weak coupling limit, i.e., when fully influenced by driving circuit but negligibly gun. Criteria are derived for validity this and numerical examples presented. Finally, sample applications to calculating maximum speed efficiency
We articulate a control method to induce intrinsic localized modes at programable bielement cell in driven microcantilever arrays. The idea is excite preassigned cantilever an oscillating state with significantly higher amplitude than the average by using feedback signal modulate frequency that drives whole array. Our thus global, which advantageous microsystems as local pinning actuation may be difficult implement small scales.
We provide, in detail, three examples of the application our stochastic model (a companion paper this journal) that provides analytical expressions for probability distribution propagation delay time logic signals through a CMOS inverter when power supply voltage V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dd</sub> (more precisely, gate xmlns:xlink="http://www.w3.org/1999/xlink">GS</sub> ) is itself probabilistic some reason (e.g., system...
High-speed, compressible flow of Argon through a converging-diverging micronozzle is examined using the Direct Simulation Monte Carlo (DSMC) method in this paper. The upstream and downstream conditions are chosen so as to yield Knudsen numbers (either based on constant transverse dimension throat or local micronozzle) transition regime. structure shock wave regime for total pressure P0~l Torr, temperature T0=298 K, exit Pexit=0.2 two limiting cases diffuse walls (no-slip) specular (maximum...
It is shown that a flat-top, constant-power, long-output pulse can be obtained from droop-compensated OFN (pulse forming network)-driven pulsed transformer. such transformers are highly efficient, and seem particularly feasible for high-voltage, long-pulse applications. Examples given generating 100 GW, high-energy pulses (250-1000 kJ) into variable resistive loads 20 kV PFN.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
The question of how a high-power RF pulse may affect digital system such as PC or an electronic control unit for vehicle has become more important sources electromagnetic interference proliferate. task building model interaction is extremely challenging, requiring us to incorporate propagation and coupling the fields, well circuit level effects. Rather than address this problem in its entirety, we choose restrict our focus simpler system, specifically microcontroller, waveforms directly...
In this tutorial paper we discuss the High Energy Transport (HETC)/Light Heavy Ion (LHI)/Spallation Gamma Source (SGS) Monte Carlo radiation transport computer code system, used to nucleons, pions, muons, photons, and "light heavy" nuclei with 2 ≤ A 10 through complex materials geometries. particular, present for first time in a single place comprehensive, introductory discussion of HETC/LHI/SGS physics.
We propose a scheme to induce intrinsic localized modes (ILMs) at an arbitrary site in microelectromechanical cantilever arrays. The idea is locate the particular beam array that one wishes drive oscillating state with significantly higher amplitude than average and then apply small adjustments electrical signal drives whole system. Our thus global closed-loop control strategy. argue dynamical mechanism on which our driving relies spatiotemporal chaos we develop detailed analysis based...
The University of New Mexico (UNM) has two research thrusts in high power electromagnetics: (i) the development novel sources microwave (HPM) radiation with ever-increasing beam-to-microwave conversion efficiency frequency range from 1 GHz to over 100 GHz, and (ii) physics-based predictive models on how electronics (and software execution) are affected when they exposed fluctuating voltages (in frequencies) that stress their operation slightly beyond specification. This paper summarizes...
We derive analytically expressions for the probability distribution of propagation delay time logic signals through a CMOS inverter when power supply voltage V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">dd</sub> (more precisely, gate xmlns:xlink="http://www.w3.org/1999/xlink">GS</sub> ) is itself probabilistic some reason (e.g., system noise or random external electromagnetic disturbance). Since function value , then values may produce that...
Summary form only given, as follows. A compact toroid (CT) formation experiment is discussed. The device has coaxial electrode diameters of 0.9 m (inner) and 1.25 (outer) an length ~1.2 m, including expansion drift section. CT formed by a 0.1-0.2-T initial radial magnetic field embedded puff gas discharge. injected with array 60 pulsed solenoid driven fast valves. discharge 108-μF, 40-100-kV, 86-540-kJ, 2-5-MA capacitor ~20-nH total inductance. hardware includes transmission line connections...
This abstract covers Part-II of a two-part presentation series on the scientific advancements made in AFOSR/AFRL Center Excellence (CoE) for Electronics Extreme Electromagnetic Environments, spanning time-period 2015-present. In specific, this focuses development and experimental validation statistical deterministic physics-based predictive models describing functional state electronic devices (semiconductor, electro-optic quantum), amalgamation these to circuits subcomponents, when...
The existence of the configurational microcanonical conditional entropy in classical statistical mechanics is proved thermodynamic limit for a class long-range multiparticle observables. This result generalizes theorem Lanford finite range