A5010827512- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Graphite, nuclear technology, radiation studies
- Radiation Detection and Scintillator Technologies
- Electron and X-Ray Spectroscopy Techniques
- Particle Detector Development and Performance
- Radiation Therapy and Dosimetry
- Nuclear physics research studies
- Nuclear and radioactivity studies
- Advanced MEMS and NEMS Technologies
- Relativity and Gravitational Theory
- Astro and Planetary Science
- Advanced Radiotherapy Techniques
- Planetary Science and Exploration
- Cosmology and Gravitation Theories
- Advancements in Photolithography Techniques
- Nuclear Materials and Properties
- Copper Interconnects and Reliability
- Semiconductor materials and devices
- Pulsars and Gravitational Waves Research
- Plasma Diagnostics and Applications
- Radio Frequency Integrated Circuit Design
- Mechanical and Optical Resonators
- Silicon Nanostructures and Photoluminescence
- Digital Radiography and Breast Imaging
Los Alamos National Laboratory
2007-2023
University of Waterloo
2023
Motorola (United States)
1982-2005
Grady Memorial Hospital
2002
University of Maryland, College Park
1972-1973
Rice University
1971
University of Oklahoma
1961
MCNP6 is simply and accurately described as the merger of MCNP5 MCNPX capabilities, but it much more than sum those two computer codes. result five years effort by code development teams. These groups people, residing in Los Alamos National Laboratory's (LANL) X Computational Physics Division, Monte Carlo Codes Group (XCP-3), Decision Applications Radiation Transport Team (D-5), respectively, have combined their efforts to produce next evolution MCNP. While maintenance bug fixes will...
New accelerator-driven technologies that utilize spallation neutrons, such as the production of tritium and transmutation radioactive waste, require accurate nuclear data to model performance target/blanket assembly predict neutron production, activation, heating, shielding requirements, material damage. To meet these needs, nuclear-data evaluations libraries up 150 MeV have been developed for use in transport calculations guide engineering design. By using advanced models account details...
The existence of a mechanism for gravitational synchrotron radiation is demonstrated in solutions the wave equation Schwarzschild background, with source particle highly relativistic circular geodesic. main features (high-frequency harmonics, narrow angular distribution latitude) are shown to hold vector (electromagnetic) and tensor (gravitational) radiations, which expected be strongly polarized orbit plane. Detailed formulas spectrum given scalar case.
This paper presents the results and methods of computing high-frequency radiation emitted by freely falling particles moving in circular geodesic orbits a spherically symmetric gravitational field. The radiation, to which this apply, is principal part radiated energy only case particle highly relativistic, therefore unstable, geodesic. synchrotron shows as main features excitation harmonics narrow angular distribution. A Green's-function solution scalar wave equation obtained using WKB...
Damping in a vibratory mechanical device plays an important role modulating the response of system. It is critical importance to understand nature damping and be able effectively control it for micro-machined devices such as sensors or actuators. For example, if too low lateral accelerometer, severe degree resonance accelerometer upon impact external force may produce large signal that cripples its circuitry resulting total system failure. High (near critical) generally desired...
The electric shock tube, below a transition pressure characteristic of the tube diameter and gas under study, exhibits two clearly distinguishable luminous fronts having apparent attributes shocks. first front is initiated too quickly to be ascribed temperature increase molecules, seems therefore depend directly on electrons their fields in some way. It hypothesized that electron primary source this motion. This hypothesis consonant with extensive evidence at hand.
The integration of microelectromechanical systems (MEMS) switch and control integrated circuit (IC) in a single package was developed for use next-generation portable wireless systems. This packaged radio-frequency (RF) MEMS exhibits an insertion loss under -0.4 dB, isolation greater than -45 dB. technology has significantly better RF characteristics conventional PIN diodes or field effect transistor (FET) switches consumes less power. chip been with high voltage charge pump plus logic chips...
We describe evaluation methods that make use of experimental data, and nuclear model calculations, to develop an ENDF-formatted data library for the reaction p + Li7 incident protons with energies up 150 MeV. The important 7-Li(p,n_0) 7-Li(p,n_1) reactions are evaluated from their angular distributions represented using Lengendre polynomial expansions. decay remaining flux is estimated GNASH calculations. ENDF-data described in detail, illustrated numerous figures. also illustrate these a...
Motorola Semiconductor Products Sector (SPS) has made significant progress in developing an integrated MEMS switch network for use next-generation portable wireless systems. This technology significantly better RF characteristics than conventional PIN diodes or FET switches and consumes less power. The exhibits insertion loss under 0.3 dB, isolation greater 50 operating power 200 /spl mu/W. chip is with a high voltage charge pump plus control logic chips into single package that provides...
Demands for mobile phones with smaller form factor and lower cost have driven enhanced integration of electronics components. However, surface acoustic wave (SAW) filters must be fabricated on piezoelectric substrates, so they are difficult to monolithically integrate semiconductor chips. This paper reports a compact wafer-scale packaged SAW filter stacked over transceiver chip in quad flat-pack no-lead (QFN) package. An integrated passive device (IPD) provided redistribution matching...
Recently a variety of improved and enhanced methods for low-energy photon/electron transport have been developed the Monte Carlo particle code MCNP6. Aspects this development include significant reworking MCNP coding to allow consideration much more detail in atomic relaxation processes, new algorithms reading processing Evaluated-Nuclear-Data-File photon, electron, data capable supporting such detailed models, extension electron/photon energy range below traditional 1-kilovolt limit MCNP,...
Purpose: Dosimetry for the model S700 50 kV electronic brachytherapy (eBT) source (Xoft, Inc., a subsidiary of iCAD, San Jose, CA) was simulated using Monte Carlo (MC) methods by Rivard et al. [“Calculated and measured dosimetry parameters in water Xoft Axxent x‐ray source: An source,” Med. Phys. 33 , 4020–4032 (2006)] recently Hiatt [“A revised dosimetric characterization containing an anode‐centering plastic insert other components not included 2006 model,” 42 2764–2776 (2015)] with...
The developmental version of MCNP5 has recently been extended to provide for continuous-energy transport high-energy protons. This enhancement involves the incorporation several significant new physics models into code. Multiple Coulomb scattering is treated with an advanced model that takes account projectile and nuclear target form factors. In next version, this will a coupled sampling both angular deflection collisional energy loss, including straggling. proton elastic also new, based on...