The ZR accelerator is a refurbishment of Sandia National Laboratories Z accelerator [1]. The ZR accelerator components were designed using electrostatic and circuit modeling tools. Transient electromagnetic modeling has played a complementary role in the analysis of ZR components [2]. In this paper we describe a 3D transient ...
Energy Citations Database
The patent application provides a compact, rugged, stable, economical device that provides both velocity and acceleration characteristics of a flowing medium by detecting and displaying the resulting convolution light intensity response of a parallel ligh...
National Technical Information Service (NTIS)
The goal of this research project is to improve photon treatment planning algorithms based on Convolution and Superposition. Monte Carlo generated dose deposition kernels were computed for materials frequently encountered in Radiotherapy, such as water, tissue, bone, calcium, iron, copper and muscle. For a monoenergetic parallel photon beam impinging upon ...
NASA Astrophysics Data System (ADS)
A fully three-dimensional electromagnetic model of the major pulsed power components of the 26-MA ZR accelerator is presented. This large-scale simulation model tracks the evolution of electromagnetic waves through the intermediate storage capacitors, laser-triggered gas switches, pulse-forming lines, water switches, tri-plate transmission lines, and ...
A new water transmission line convolute, single piece insulator, and double disk feed has been designed and tested on the .125 ohm, 10 TW Proto II accelerator. The water transmission lines have a 5 cm gap to eliminate any water arcing. A two-dimensional magnetic field code was used to calculate ...
A new water transmission line convolute, single piece insulator, and double accelerator. The water transmission lines have a 5 cm gap to eliminate any water arcing. A two-dimensional magnetic field code was used to calculate the convolute inductance. An acrylic insulator ...
A technique is presented for numerical time domain simulation of water particle velocities and acceleration corresponding to a desired wave spectrum. Standard practice is to sum a finite number of sinusoidal components with random phase. The new method uses a simple constant coefficient linear prediction equation to generate time series simulations of ...
A three-dimensional, fully electromagnetic model of the principal pulsed-power components of the 26-MA ZR accelerator [D. H. McDaniel , in Proceedings of the 5th International Conference on Dense Z-Pinches (AIP, New York, 2002), p. 23] has been developed. This large-scale simulation model tracks the evolution of electromagnetic waves through the ...
A rapid growth of population, intensive civil and industrial building, land and water instabilities (e.g., landslides, significant underground water level fluctuations), and the lack of public awareness regarding seismic hazard contribute to the increase of vulnerability of the Baku city to earthquakes. In this study, we use a quantitative approach to ...
Saturn will be the large area flash x-ray source for the Simulation Technology Laboratory (STL) Project. The performance goal of Saturn is to provide an x-ray exposure capability of 5 x 10/sup 12/ rads/s (Si) and 5 cal/g (Au) over an area of 500 cm/sup 2/. The Saturn project consists of converting the PBFA-I ion accelerator into an x-ray simulator that will meet these ...
Many contemporary visualization tools comprise some image filtering approach. Since image filtering approaches are very computationally demanding, the acceleration using graphics-hardware (GPU) is very desirable to preserve interactivity of the main visualization tool itself. In this article we take a close look on GPU implementation of two basic approaches to image filtering ...
E-print Network
Two distinct simulation approaches for magnetic insulation are developed which can be used to address the question of nonsimultaneity. First, a two-dimensional model for a two-module system is simulated using a fully electromagnetic, two-dimensional, time...
We have conducted experiments on Sandia National Laboratories' Mite accelerator (2 MV, 4.8 ohms) to study the effect of geometric transitions on power flow in a magnetically insulated power feed. The effect of both changing gaps (electric convolutes) and ...
Saturn is the result of a major metamorphosis of the Particle Beam Fusion Accelerator-I (PBFA-I) from an ICF research facility to the large-area X-ray source of the Simulation Technology Laboratory (STL) project. Renamed Saturn, for its unique multiple-ring diode design, the facility is designed to take advantage of the numerous advances in pulsed power technology. Saturn will ...
Diffusion, lossy wave, and Klein-Gordon equations find numerous applications in practical problems across a range of diverse disciplines. The temporal dependence of all three Green�s functions are characterized by an infinite tail. This implies that the cost complexity of the spatio-temporal convolutions, associated with evaluating the potentials, scales as ONs2Nt2, where Ns ...
We have developed an accelerator architecture that can serve as the basis of the design of petawatt-class z-pinch drivers. The architecture has been applied to the design of two z-pinch accelerators, each of which can be contained within a 104-m-diameter cylindrical tank. One accelerator is driven by slow (�1?s) Marx generators, ...
... CONVOLUTION METHODS FOR MATHEMATICAL PROBLEMS IN BIOMETRICS by ... Convolution Methods for Mathematical Problems in Biometrics ...
DTIC Science & Technology
This is a hands-on creative group project in which the students will create and build a nephron structure, and using a detailed worksheet and labeled solutes, follow the initial filtrate at the glomerulus through filtration, reabsorption and secretion in the production of urine. Creatinine, distal convoluted tubule, glomerular filtrate, Penicillin, pesticides, proximal ...
NSDL National Science Digital Library
PBFA Z is a new 55 TW/4.5 MJ short pulse electrical driver located at Sandia National Laboratories. The authors use PBFA Z to magnetically-implode plasma shells. These configurations are historically known as z pinches. The pulsed power design of PBFA Z is based on conventional single-pulse Marx generator, water-line pulse-forming technology used on the earlier Saturn and PBFA ...
Self-magnetically insulated, high voltage transmission lines are used in inertial confinement fusion particle accelerators to transmit power from the vacuum insulator to the diode. Injection and output convoluted sections pose special problems in establishing the desired electron flow pattern needed to maintain high overall efficiency. A time independent, ...
DOE Information Bridge
... other) species become established in this water body. MATERIALS AND METHODS Study Site LOW is a complex water body with a convoluted ... establishment of E. coregoni in certain regions of LOW. Also, an...
NBII National Biological Information Infrastructure
A solar water heating system is described for a tank subject to freezing comprising an open water tank of predetermined size adapted to have water therein at a certain level, a solar water heater substantially less in cross section than the predetermined size disposed in the tank and adapted to have a substantial ...
Sandia National Laboratories is completing a major modification to the PBFA-II facility. PBFA Z will be a z-pinch driver capable of delivering up to 20 MA to a z-pinch load. It optimizes the electrical coupling to the implosion energy of z pinches at implosion velocities of {approximately} 40 cm/{mu}s. Design constraints resulted in an accelerator with a 0.12-{Omega} ...
Sandia is modifying the PBFA II accelerator into a dual use facility. While maintaining the present ion-beam capability, we are developing a long-pulse, high-current operating mode for magnetically-driven implosions. This option, called PBFA II-Z, will require new water transmission lines, a new insulator stack, and new magnetically-insulated transmission ...
... Then the mean value theorem of the integral calculus and various numerical integrators are used to develop convolution approximations of use in ...
The problem of stream-aquifer interactions is pertinent to conjunctive-use management of water resources and riparian zone hydrology. Closed form solutions are derived for stream-aquifer interactions in rates and volumes expressed as convolution integrals of impulse response and ...
EPA Science Inventory
The catastrophic disturbance of unconsolidated sediment produces a wide variety of deformation structures, particularly if the sediment is water-saturated at the time of disturbance. Layers, originally deposited as sub-horizontal, can become stretched or ...
Page 1. IN,. 0 TECHNICAL REPORT T-78-66 US ARMY TRAPEZOIDAL CONVOLUTION REVISITED: RK CONVOLUTION ...
The Z and ZR accelerators at Sandia National Laboratories utilize vacuum post-hole-convolutes, which join several magnetically insulated transmission lines (MITLs) in parallel, to drive z-pinch loads at current levels between 19 and 24 MA. Outer (r�70 cm) and inner (r=6 cm) MITL B-dot probes are used to determine current losses in the combined MITL and ...
Saturn is a dual-purpose accelerator. It can be operated as a large-area flash x-ray source for simulation testing or as a Z-pinch driver especially for K-line x-ray production. In the first mode, the accelerator is fitted with three concentric-ring 2-MV electron diodes, while in the Z-pinch mode the current of all the modules is combined via a post-hole ...
... Page 2. CATHODIC DELAMINATION ACCELERATED LIFE TEST METHOD ... a 1:est for cathodic delamination of such materials in water. ...
a special laser- profiling CCD-camera that could be translated along the laser beam propagation direction upgrades, including the major hardware upgrades to the laser transport, the laser beam diagnostics line performed to account for contributions to y, the size of the convolution between the electron beam and laser
A rapid growth of population, intensive civil and industrial building, land and water instabilities (e.g. landslides, significant underground water level fluctuations), and the lack of public awareness regarding seismic hazard contribute to the increase of vulnerability of Baku (the capital city of the Republic of Azerbaijan) to earthquakes. In this study, ...
Saturn is the result of a major metamorphosis of the Particle Beam Fusion Accelerator-I (PBFA-I) from an ICF research facility to the large-area x-ray source of the Simulation Technology Laboratory (STL) project. Renamed Saturn, for its unique multiple-ring diode design, the facility is designed to take advantage of the numerous advances in pulsed power technology made by the ...
Current practice in the nuclear industry and elsewhere is to specify the seismic input to design calculations at the surface of the site, rather than at bedrock. This paper investigates the implications of such a specification by comparing the site response of a surface specification to the site response of a corresponding bedrock specification. The investigation considered six different sites ...
A realistic photon beam model based on Monte Carlo simulation of clinical linear accelerators was implemented in a convolution/superposition dose calculation algorithm. A primary and an extra-focal sources were used in this beam model to represent the direct photons from the target and the scattered photons from other head structures, respectively. The ...
PubMed
... Title : SPECTRAL ANALYSIS OF THE CONVOLUTION AND FILTERING OF NONSTATIONARY STOCHASTIC PROCESSES. ...
... OF SERIALLY CONCATENATED CONVOLUTIONAL CODES WITH BINARY MODULATION IN AWGN AND NOISE JAMMING OVER RAYLEIGH ...
In this paper, coset codes are considered as terminated convolutional codes. Based on this approach,
NASA Technical Reports Server (NTRS)
It is shown that the convolution of IFRA (Increasing failure rate average) distributions is IFRA. (Author)
... Title : CORRELATION AND CONVOLUTION OF BULK ACOUSTIC WAVES IN NONPIEZOELECTRIC SOLIDS. Corporate Author : ...
... Title : CONVOLUTION OF PHOSPHOR RESPONSES OCCURRING IN CASCADED IMAGE INTENSIFIER TUBES AND RELATED SUBJECTS. ...
... Accession Number : AD0608399. Title : CHEMOTHERAPY, CONVOLUTION EQUATIONS, AND DIFFERENTIAL APPROXIMATION,. ...
... FUNCTIONS, ALGORITHMS, CONVOLUTION, DISTRIBUTION, FUNCTIONS, INTEGRALS, LOGISTICS, MIXTURES, MODELS, SCALE. ...
... Accession Number : AD0646628. Title : AN ALGOL CONVOLUTION PROCEDURE BASED ON THE FAST FOURIER TRANSFORM. ...
In this paper we present a technique to obtain a diffusion profile of layered turbid media in real time by using the quasi fast Hankel transform (QFHT) and the latest graphics processing unit technique. We apply the QFHT to convolve the diffusion profiles of each layer so as to dramatically reduce the time for the convolution step while maintaining the accuracy. In addition, ...
Water jets are produced by vertically accelerating a rotating cone partially filled with water. It is shown that the acceleration of the parabolic meniscus results in a motion similar to that observed in a shaped explosive charge (Monroe jet). Accleration...
... Accession Number : AD0757941. Title : High Speed Water Jets from Vertically Accelerated Rotating Cones,. Corporate Author ...
... Title : HOLD-PERIOD ACCELERATED COOLING EXPERIMENTS ON Nb- AND Ti ... Abstract : HIGH-VOLUME WATER SPRAYS AND AIR-WATER ...
... Title : Accelerated Decompression from Saturation at 132 Feet of Sea Water With Isobaric oxygenation at 60 Feet of Sea Water. ...
An in-water dehydrative alkylation with a novel heterobimetallic polymeric catalyst is described. Thus, a boron-iridium heterobimetallic polymeric catalyst was prepared by ionic convolution of a poly(catechol borate) and an iridium complex. The alkylation of ammonia and amines with alcohols, alkylating agents, was performed with 1 mol % Ir of the ...
In this paper, we deal with the computation of ground state and dynamics of the Schr�dinger�Poisson�Slater (SPS) system. To this end, backward Euler and time-splitting pseudospectral methods are proposed for the nonlinear Schr�dinger equation with the nonlocal Hartree potential approximated by solving a Poisson equation. The approximation approaches for the Hartree potential include fast ...
We describe a hybrid Fourier/direct space convolution algorithm for compact radial (azimuthally symmetric) kernels on the sphere. For high resolution maps covering a large fraction of the sky, our implementation takes advantage of the inexpensive massive parallelism afforded by consumer graphics processing units (GPUs). Its applications include modeling of instrumental beam ...
A detailed numerical and analytical study of the beam dynamics in a rebatron acceleration has shown that energies approaching 1 GeV can be achieved within 5-10 microseconds. Since the acceleration in the rebatron occurs within a short time, the device many not be sensitive to the various instabilities and the loss to synchrotron radiation should be small. ...
Abstract: In this issue, Beaumont et al report cancer mortality rates associated with exposure to high concentrations of hexavalent chromium in well water in Liaoning Province, China. Contamination of drinking water at these levels has been reported only once before, among a small group in Mexico. The investigation in China is a ...
Existing aquifer models are either computationally inefficient or inaccurate for reservoir water-influx calculations. A new fast convolution method (FCM) that does not require lengthy data manipulation is used to implement four different single-porosity finite and infinite aquifer models for unsteady-state water-influx calculations. ...
The two-dimensional lateral dose profiles D(x, y) of narrow photon beams, typically used for beamlet-based IMRT, stereotactic radiosurgery and tomotherapy, can be regarded as resulting from the convolution of a two-dimensional rectangular function R(x, y), which represents the photon fluence profile within the field borders, with a rotation-symmetric ...
The objective of this study was to ascertain the condition of braze joints and cooling water hardware from an accelerator section after prolonged use. Metallographic analysis was used to examine critical sites on an accelerator section that had been in us...
The operation of the proposed Continuous Electron Beam Accelerator Facility (CEBAF) at Newport News, Virginia, is expected to result in the activation and subsequent contamination of water resources in the vicinity of the accelerator. Since the proposed s...
... AD-A283 1I4*i CONVOLUTION ALGEBRA FOR FLUID MODES WITH FINITE ENERGY ... Convolution Algebra for Fluid Modes With Finite Energy ...
The BC Cribs and Trenches, part of the 200 TW 1 OU waste sites, received about 30 Mgal of scavenged tank waste, with possibly the largest inventory of 99Tc ever disposed to the soil at Hanford and site remediation is being accelerated. The purpose of this work was to develop a conceptual model for contaminant fate and transport at the 216-B-26 Trench site to support ...
PBFA Z is a new 60-TW/5-MJ electrical driver located at Sandia National Laboratories. The authors use PBFA Z to drive z pinches. The pulsed power design of PBFA Z is based on conventional single-pulse Marx generator, water-line pulse-forming technology used on the earlier Saturn and PBFA II accelerators. PBFA Z stores 11.4 MJ in its 36 Marx generators, ...
) involving water molecules, dissolved material and particulates as well as trans-spectral (inelastic) processes involving fluorescence by water molecules (Raman), dissolved material and chlorophyll. Intrinsic to the convolution was the ability to position the vehicle at depths where Raman fluorescence
An integrated foundation is presented to study the impacts of external forcings on irrigated agricultural systems. Individually, models are presented that simulate groundwater hydrogeology and econometric farm level crop choices and irrigated water use. The natural association between groundwater we...
Technology Transfer Automated Retrieval System (TEKTRAN)
The implementation of intensity-modulated radiation therapy (IMRT) in the clinic necessitates commissioning for all systems involved. This paper describes work carried out for the treatment planning system (Helax-TMS version 6.1) and the treatment delivery equipment (Siemens Primus) available at our center. Particular regard was paid to small monitor units (MUs) and small field segments typical of ...
