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Estimates of post-acceleration longitudinal bunch compression

Description: A simple analytic method is developed, based on physical approximations, for treating transient implosive longitudinal compression of bunches of heavy ions in an accelerator system for ignition of inertial-confinement fusion pellet targets. Parametric dependences of attainable compressions and of beam path lengths and times during compression are indicated for ramped pulsed-gap lines, rf systems in storage and accumulator rings, and composite systems, including sections of free drift. It appear… more
Date: November 25, 1977
Creator: Judd, D.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Quadric solids and computational geometry

Description: As part of the CAD-CAM development project, this report discusses the mathematics underlying the program QUADRIC, which does computations on objects modeled as Boolean combinations of quadric half-spaces. Topics considered include projective space, quadric surfaces, polars, affine transformations, the construction of solids, shaded image, the inertia tensor, moments, volume, surface integrals, Monte Carlo integration, and stratified sampling. 1 figure.
Date: July 25, 1980
Creator: Emery, J.D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Supporting Material for: Thermochemical Investigations of Solute Transfer into Ionic Liquid Solvents: Updated Abraham Model Equation Coefficients for Solute Activity Coefficient and Partition Coefficient Predictions

Description: This document includes supplemental material to an article titled "Thermochemical Investigations of Solute Transfer into Ionic Liquid Solvents: Updated Abraham Model Equation Coefficients for Solute Activity Coefficient and Partition Coefficient Predictions," published in Physics and Chemistry of Liquids.
Date: February 25, 2014
Creator: Stephens, Timothy W.; Chou, Vicky; Quay, Amanda N.; Shen, Connie; Dabadge, Nishu; Tian, Amy et al.
Item Type: Refine your search to only Text
Partner: UNT College of Arts and Sciences
open access

Thermochemical Investigations of Solute Transfer into Ionic Solvents: Updated Abraham Model Equation Coefficients for Solute Activity Coefficient and Partition Coefficient Predictions

Description: Article on thermochemical investigations of solute transfer into ionic liquid solvents and updated Abraham model equation coefficients for solute activity coefficient and partition coefficient predictions.
Date: February 25, 2014
Creator: Stephens, Timothy W.; Chou, Vicky; Quay, Amanda N.; Shen, Connie; Dabadge, Nishu; Tian, Amy et al.
Item Type: Refine your search to only Article
Partner: UNT College of Arts and Sciences
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Development of software for computer assisted model simplification. Final report. [Lagrange multipliers]

Description: The final report of DBS Corporation on the model simplification project is presented. The purpose of the project is to develop computer-assisted model simplification. The contributions of DBS to this project where an initial overall project assessment, contributions to design principles and testing procedures, specific experimental designs, and initial test results. The main contributions of DBS to this project were in the area of LP matrix scaling, and particularly in the potential usefulness … more
Date: April 25, 1980
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SLIM--An Early Work Revisited

Description: An early, but at the time illuminating, piece of work on how to deal with a general, linearly coupled accelerator lattice is revisited. This work is based on the SLIM formalism developed in 1979-1981.
Date: July 25, 2008
Creator: Chao, Alex
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Automated microscopy methods for measuring pyritic sulfur content of coal and determining degree of liberation of pyrite in coal: Final report

Description: The objective of this project is to develop an automated procedure, to be implemented in an IBAS image analyzer, to determine size, shape and degree of liberation of pyrite particles in a coal matrix. This procedure is to work in real time conditions and with minimal intervention from the operator. Our approach is to create from the original microscopic image a three level image with the following components: epoxy, coal macerals and pyrite to simplify the calculations. Enhancing the original i… more
Date: July 25, 1987
Creator: Chaparro, L.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Angular measurements in optical testing

Description: The measurement of angles plays an important role in practically every discipline of optics, including prism manufacture, optical assembly and alignment. It is the purpose of this paper to review some of the angle measurement techniques and how they are used in optical testing.
Date: September 25, 1980
Creator: Thomas, N.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A pipelined IC architecture for radon transform computations in a multiprocessor array

Description: The amount of data generated by CT scanners is enormous, making the reconstruction operation slow, especially for 3-D and limited-data scans requiring iterative algorithms. The Radon transform and its inverse, commonly used for CT image reconstruction from projections, are computationally burdensome for today's single-processor computer architectures. If the processing times for the forward and inverse Radon transforms were comparatively small, a large set of new CT algorithms would become feas… more
Date: May 25, 1990
Creator: Agi, I.; Hurst, P.J. & Current, K.W. (California Univ., Davis, CA (USA). Dept. of Electrical Engineering and Computer Science)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

HP-67 calculator programs for thermodynamic data and phase diagram calculations

Description: This report is a supplement to a tabulation of the thermodynamic and phase data for the 100 binary systems of Mo with the elements from H to Lr. The calculations of thermodynamic data and phase equilibria were carried out from 5000/sup 0/K to low temperatures. This report presents the methods of calculation used. The thermodynamics involved is rather straightforward and the reader is referred to any advanced thermodynamic text. The calculations were largely carried out using an HP-65 programmab… more
Date: May 25, 1978
Creator: Brewer, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A system for measuring the attenuation of X-rays by various materials

Description: The Filter Attenuation Measurement System was designed by J.H. McCrary. It is, as its name implies, primarily intended to measure the attenuation of an x-ray beam by various substances. However, it can also be a very useful instrument for qualitative as well as quantitative analysis through the use of absorption edge spectrometry. The essential components of the system are depicted. The brehmstrahlung originating in a tungsten target x-ray tube is collimated and the desired energy picked out by… more
Date: October 25, 1971
Creator: Singman, L. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of existing polymer characterization techniques and capabilities of the General Chemistry and Organic Materials Divisions in the Chemistry and Materials Science Department

Description: This report begins with definitions of characterization and testing, then continues with the evaluation of thirteen specific techniques including various spectroscopy, thermal, solutional properties, wet chemistry, chromatography and miscellaneous procedures. Comments and recommendations on the need for an analytical services focal point in GCD, a polymer characterization expert in OMD and the use of contractor facilities as a source of data gathering are made. It is concluded that substantial … more
Date: August 25, 1976
Creator: Larsen, Fred N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Hamiltonian Structure and Euler-Poincare Formulation of the Valsov-Maxwell and Gyrokinetic System

Description: We present a new variational principle for the gyrokinetic system, similar to the Maxwell-Vlasov action presented in Ref. 1. The variational principle is in the Eulerian frame and based on constrained variations of the phase space fluid velocity and particle distribution function. Using a Legendre transform, we explicitly derive the field theoretic Hamiltonian structure of the system. This is carried out with the Dirac theory of constraints, which is used to construct meaningful brackets from t… more
Date: September 25, 2012
Creator: Squire, J.; Qin, H. & Tang, W. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Obfuscatory measurement

Description: ''Obfuscatory measurement'' is the practice, deliberate or not, of obscuring the true performance of a system through the use of misleading measures. Many of the traditional and widely used measures of computer system performance are obfuscatory: they measure the wrong things, the right things wrongly, or nothing at all. Several obfuscatory measures are considered; those aspects of the system they are thought to measure are contrasted with those that they actually measure; and alternative measu… more
Date: July 25, 1977
Creator: Stevens, D. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Measured vs calculated river {Delta}T

Description: River temperature traverse data within and just the plant boundary are quite limited. For this report, traverse temperatures were calculated by first averaging the depth measurements vertically at each traverse point, and then weighing the average for the cross section by the depth at each point and the span between points. Calculated {Delta} T`s were determined by dividing the total reactor power level above the traverse line by the river flow, with the appropriate factor to obtain the correct… more
Date: October 25, 1962
Creator: Corley, J. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Supernodal Approach to Incomplete LU Factorization with Partial Pivoting

Description: We present a new supernode-based incomplete LU factorization method to construct a preconditioner for solving sparse linear systems with iterative methods. The new algorithm is primarily based on the ILUTP approach by Saad, and we incorporate a number of techniques to improve the robustness and performance of the traditional ILUTP method. These include the new dropping strategies that accommodate the use of supernodal structures in the factored matrix. We present numerical experiments to demons… more
Date: June 25, 2009
Creator: Li, Xiaoye Sherry & Shao, Meiyue
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The Use of Weighting in Periodicity Searches in All-Sky Monitor Data: Applications to the GLAST LAT

Description: The light curves produced by all-sky monitors, such as the Rossi X-ray Timing Explorer All-Sky Monitor and the Swift Burst Alert Telescope (BAT), generally have non-uniform error bars. In searching for periodic modulation in this type of data using power spectra it can be important to use appropriate weighting of data points to achieve the best sensitivity. It was recently demonstrated that for Swift BAT data a simple weighting scheme can actually sometimes reduce the sensitivity of the power s… more
Date: June 25, 2009
Creator: Corbet, Robin & Dubois, Richard
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ground Movement in SSRL Ring

Description: Users of the Stanford Synchrotron Radiation Lightsource (SSRL) are being affected by diurnal motion of the synchrotron's storage ring, which undergoes structural changes due to outdoor temperature fluctuations. In order to minimize the effects of diurnal temperature fluctuations, especially on the vertical motion of the ring floor, scientists at SSRL tried three approaches: painting the storage ring white, covering the asphalt in the middle of the ring with highly reflective Mylar and installin… more
Date: August 25, 2011
Creator: Sunikumar, Nikita & /SLAC, /UCLA
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computation at the edge of chaos: Phase transition and emergent computation

Description: In order for computation to emerge spontaneously and become an important factor in the dynamics of a system, the material substrate must support the primitive functions required for computation: the transmission, storage, and modification of information. Under what conditions might we expect physical systems to support such computational primitives This paper presents research on Cellular Automata which suggests that the optimal conditions for the support of information transmission, storage, a… more
Date: January 25, 1990
Creator: Langton, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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ERHIC Conceptual Design

Description: The conceptual design of the high luminosity electron-ion collider, eRHIC, is presented. The goal of eRHIC is to provide collisions of electrons (and possibly positrons) with ions and protons at the center-of-mass energy range from 25 to 140 GeV, and with luminosities exceeding 10{sup 33} cm{sup -2} s{sup -1}. A considerable part of the physics program is based on polarized electrons, protons and He3 ions with high degree of polarization. In eRHIC electron beam will be accelerated in an energy … more
Date: August 25, 2008
Creator: Ptitsyn, V.; Beebe-Wang, J.; Ben-Zvi, Ilan; Fedotov, A.; Fischer, W.; Hao, Y. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Longitudinal-to-Transverse Mapping for Femtosecond Electron Bunch Length Measurement

Description: A longitudinal-to-transverse mapping technique is proposed to measure the length and temporal profile of ultrashort electron bunches. In this scheme a special chicane and a radio-frequency deflecting cavity are used to transform the beam's longitudinal distribution into angular distribution which is further converted to transverse distribution after a parallel-to-point imaging beam line. With this technique, the temporal profile of the electron beam is exactly mapped to the transverse profile. … more
Date: August 25, 2010
Creator: Xiang, Dao & Ding, Yuantao
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

A Two-Dimensional Fem Code for Impedance calculation in High Frequency Domain

Description: A new method, using the parabolic equation (PE), for the calculation of both high-frequency impedances of small-angle taper (or collimator) is developed in [1]. One of the most important advantages of the PE approach is that it eliminates the spatial scale of the small wavelength from the problem. As a result, only coarser spatial meshes are needed in calculating the numerical solution of the PE. We developed a new code based on Finite Element Method (FEM) which can handle arbitrary profile of … more
Date: August 25, 2010
Creator: Wang, Lanfa; Lee, Lie-Quan & Stupakov, Gennady
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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