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ITER structural design criteria and their extension to advanced fusion reactor blankets.

Description: Application of the new low-temperature-design rules of the ITER Structural Design Criteria (ISDC) is illustrated by considering copper alloys that, according to recent data, are particularly prone to irradiation embrittlement at relatively low fluences at certain temperatures, Allowable stresses are derived and the impact of the embrittlement on allowable surface heat flux of a simple first-wall/limiter design is demonstrated. High-temperature-design rules of ISDC are applied to EVOLVE (Evapora… more
Date: September 3, 1999
Creator: Kalnin, G. & Majumdar, S.
Item Type: Refine your search to only Article
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ITER system study---Safety aspects

Description: One of the tasks of the ITER Systems Analysis Group has been safety and environmental analyses. The safety analyses show that radiological doses from operational effluents and accidents are consistent with anticipated regulatory dose limits. To improve safety further and to meet the ambitious goal of passive safety,'' further efforts to reduce inventories of tritium and activation products are proposed. Most major safety issues are now associated with Plasma Facing Components (PFC). 2 tabs.
Date: January 1, 1990
Creator: Piet, S.J. (EG and G Idaho, Inc., Idaho Falls, ID (USA)); Iida, H.; Seki, Y. (Japan Atomic Energy Research Inst., Naka, Ibaraki (Japan). Naka Fusion Research Establishment); Raeder, J. (Max-Planck-Institut fuer Plasmaphysik, Garching (Germany, F.R.). NET Design Team) & Topilski, L.N. (Gosudarstvennyj Komitet po Ispol'zovaniyu Atomnoj Ehnergii SSSR, Moscow (USSR). Inst. Atomnoj Ehnergii)
Item Type: Refine your search to only Article
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ITER vacuum vessel design (D201 subtask 1.3 and subtask 3). Final report

Description: ITER Task No. D201, Vacuum Vessel Design (Subtask 1.3 and Subtask 3), was initiated to propose and evaluate local vacuum vessel reinforcement alternatives in proximity to the Neutral Beam, Radial Mid-Plane, Top, and Divertor Ports. These areas were reported to be highly stressed regions based on the results of preliminary stress analyses performed by the USHT (US Home Team) and the ITER Joint Central Team (JCT) at the Garching JWS (Joint Work Site). Initial design activities focused on the dive… more
Date: August 1, 1996
Item Type: Refine your search to only Report
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ITER vacuum vessel dynamic stress analysis of a disruption

Description: Dynamic stress analysis of the International Thermonuclear Experimental Reactor vacuum vessel loaded by disruption forces was performed. The deformation and stress results showed strong inertial effects when compared to static analyses. Maximum stress predicted dynamically was 300 MPa, but stress shown by static analysis from loads at the same point in time reached only 80 MPa. The analysis also provided a reaction load history in the vessel`s supports which is essential in evaluating support d… more
Date: December 1994
Creator: Riemer, B. W.; Conner, D. L.; Strickler, D. J. & Williamson, D. E.
Item Type: Refine your search to only Article
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ITER vacuum vessel fabrication plan and cost study (D 68) for the international thermonuclear experimental reactor

Description: ITER Task No. 8, Vacuum Vessel Fabrication Plan and Cost Study (D68), was initiated to assess ITER vacuum vessel fabrication, assembly, and cost. The industrial team of Raytheon Engineers & Constructors and Chicago Bridge & Iron (Raytheon/CB&I) reviewed the current vessel basis and prepared a manufacturing plan, assembly plan, and cost estimate commensurate with the present design. The guidance for the Raytheon/CB&I assessment activities was prepared by the ITER Garching Work Site. This guidanc… more
Date: January 1, 1995
Item Type: Refine your search to only Report
open access

Iterated transportation simulations for Dallas and Portland

Description: The goal of the TRansportation ANalysis and SIMulation System (TRANSIMS) is to combine the most important aspects of human decision-making related to transportation, from activities planning (sleep, work, eat, shop,...) via modal and route planning to driving, into a single, consistent methodological and software framework. This is meant to combine the functionalities of activities-based travel demand generation, modal choice and route assignment, and micro-simulation. TRANSIMS attempts to empl… more
Date: September 2, 1998
Creator: Nagel, K.; Simon, P.; Rickert, M. & Esser, J.
Item Type: Refine your search to only Article
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Iterative acceleration methods for Monte Carlo and deterministic criticality calculations

Description: If you have ever given up on a nuclear criticality calculation and terminated it because it took so long to converge, you might find this thesis of interest. The author develops three methods for improving the fission source convergence in nuclear criticality calculations for physical systems with high dominance ratios for which convergence is slow. The Fission Matrix Acceleration Method and the Fission Diffusion Synthetic Acceleration (FDSA) Method are acceleration methods that speed fission s… more
Date: November 1, 1995
Creator: Urbatsch, T.J.
Item Type: Refine your search to only Report
open access

Iterative electromagnetic Born inversion applied to earth conductivity imaging

Description: This thesis investigates the use of a fast imaging technique to deduce the spatial conductivity distribution in the earth from low frequency (< 1 MHz), cross well electromagnetic (EM) measurements. The theory embodied in this work is the extension of previous strategies and is based on the Born series approximation to solve both the forward and inverse problem. Nonlinear integral equations are employed to derive the series expansion which accounts for the scattered magnetic fields that are gene… more
Date: August 1, 1993
Creator: Alumbaugh, D. L.
Item Type: Refine your search to only Thesis or Dissertation
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Iterative methods for large scale nonlinear and linear systems. Final report, 1994--1996

Description: The major goal of this research has been to develop improved numerical methods for the solution of large-scale systems of linear and nonlinear equations, such as occur almost ubiquitously in the computational modeling of physical phenomena. The numerical methods of central interest have been Krylov subspace methods for linear systems, which have enjoyed great success in many large-scale applications, and newton-Krylov methods for nonlinear problems, which use Krylov subspace methods to solve ap… more
Date: September 1, 1997
Creator: Walker, H.F.
Item Type: Refine your search to only Report
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Iterative methods for nonsymmetric systems on MIMD machines

Description: A wide variety of physical phenomena arising within many scientific disciplines can be described by systems of coupled partial differential equations (PDEs). The numerical approximation of these PDEs often involves the solution of a system of algebraic equations (possibly nonlinear) which are typically large, sparse and nonsymmetric. The increasing computational demands required by the solution of such complex scientific applications has motivated the current direction toward large-scale parall… more
Date: October 16, 1990
Creator: Shadid, J.N. & Tuminaro, R.S.
Item Type: Refine your search to only Article
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Iterative methods for the WLS state estimation on RISC, vector, and parallel computers

Description: We investigate the suitability and effectiveness of iterative methods for solving the weighted-least-square (WLS) state estimation problem on RISC, vector, and parallel processors. Several of the most popular iterative methods are tested and evaluated. The best performing preconditioned conjugate gradient (PCG) is very well suited for vector and parallel processing as is demonstrated for the WLS state estimation of the IEEE standard test systems. A new sparse matrix format for the gain matrix i… more
Date: October 1, 1993
Creator: Nieplocha, J. & Carroll, C. C.
Item Type: Refine your search to only Article
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The iterative Monte Carlo technique for collisionless plasma flow to a surface

Description: A new technique for modelling the boundary plasma of magnetic fusion devices is described. The technique represents a natural extension of existing Monte Carlo codes, which are presently constrained to have the plasma background specified by either measurements or predictions from plasma fluid codes. The new approach, the Iterative Monte Carlo (IMC) technique, self-consistently determines the ambipolar electric field in the plasma by feeding back into the simulation the evolving plasma density … more
Date: March 1, 1993
Creator: Pitcher, C. S.
Item Type: Refine your search to only Report
open access

The iterative Monte Carlo technique for collisionless plasma flow to a surface

Description: A new technique for modelling the boundary plasma of magnetic fusion devices is described. The technique represents a natural extension of existing Monte Carlo codes, which are presently constrained to have the plasma background specified by either measurements or predictions from plasma fluid codes. The new approach, the Iterative Monte Carlo (IMC) technique, self-consistently determines the ambipolar electric field in the plasma by feeding back into the simulation the evolving plasma density … more
Date: March 1, 1993
Creator: Pitcher, C. S.
Item Type: Refine your search to only Report
open access

Iterative prediction of chaotic time series using a recurrent neural network

Description: Chaotic systems are known for their unpredictability due to their sensitive dependence on initial conditions. When only time series measurements from such systems are available, neural network based models are preferred due to their simplicity, availability, and robustness. However, the type of neutral network used should be capable of modeling the highly non-linear behavior and the multi-attractor nature of such systems. In this paper the authors use a special type of recurrent neural network … more
Date: December 31, 1996
Creator: Essawy, M.A.; Bodruzzaman, M.; Shamsi, A. & Noel, S.
Item Type: Refine your search to only Article
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Iterative prediction of chaotic time series using a recurrent neural network. Quarterly progress report, January 1, 1995--March 31, 1995

Description: Chaotic systems are known for their unpredictability due to their sensitive dependence on initial conditions. When only time series measurements from such systems are available, neural network based models are preferred due to their simplicity, availability, and robustness. However, the type of neural network used should be capable of modeling the highly non-linear behavior and the multi- attractor nature of such systems. In this paper we use a special type of recurrent neural network called th… more
Date: March 31, 1996
Creator: Bodruzzaman, M. & Essawy, M.A.
Item Type: Refine your search to only Report
open access

Iterative retrieval of surface emissivity and temperature for a hyperspectral sensor

Description: The central problem of temperature-emissivity separation is that we obtain N spectral measurements of radiance and need to find N + 1 unknowns (N emissivities and one temperature). To solve this problem in the presence of the atmosphere we need to find even more unknowns: N spectral transmissions {tau}{sub atmo}({lambda}) up-welling path radiances L{sub path}{up_arrow}({lambda}) and N down-welling path radiances L{sub path}{down_arrow}({lambda}). Fortunately there are radiative transfer codes s… more
Date: November 1, 1997
Creator: Borel, C.C.
Item Type: Refine your search to only Article
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An iternative algorithm for correcting sequencing errors in DNA coding regions

Description: Insertion and deletion (indel) sequencing errors in DNA coding regions disrupt DNA-to-protein translation frames, and hence make most frame-sensitive coding recognition approaches fail. This paper extends the authors` previous work on indel detection and `correction` algorithms, and presents a more effective algorithm for localizing indels that appear in DNA coding regions and `correcting` the located indels by inserting or deleting DNA bases. The algorithm localizes indels by discovering chang… more
Date: December 31, 1995
Creator: Xu, Ying; Mural, Richard J. & Uberbacher, E. C.
Item Type: Refine your search to only Article
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ITOUGH2 command reference. Version 3.1

Description: This report contains a detailed description of all ITOUGH2 commands. It complements the ITOUGH2 User`s Guide and the collection of ITOUGH2 sample problems. ITOUGH2 is a program for parameter estimation, sensitivity analysis, and uncertainty propagation analysis. It is based on the TOUGH2 simulator for non-isothermal multiphase flow in fractured and porous media. Extensive experience in using TOUGH2 is a prerequisite for using ITOUGH2. The preparation of an input file for TOUGH2 or its derivativ… more
Date: April 1, 1997
Creator: Finsterle, S.
Item Type: Refine your search to only Report
open access

ITOUGH2 sample problems

Description: This report contains a collection of ITOUGH2 sample problems. It complements the ITOUGH2 User`s Guide [Finsterle, 1997a], and the ITOUGH2 Command Reference [Finsterle, 1997b]. ITOUGH2 is a program for parameter estimation, sensitivity analysis, and uncertainty propagation analysis. It is based on the TOUGH2 simulator for non-isothermal multiphase flow in fractured and porous media [Preuss, 1987, 1991a]. The report ITOUGH2 User`s Guide [Finsterle, 1997a] describes the inverse modeling framework … more
Date: November 1, 1997
Creator: Finsterle, S.
Item Type: Refine your search to only Report
open access

ITOUGH2 software qualification

Description: The purpose of this report is to provide all software baseline documents necessary for the software qualification of ITOUGH2. ITOUGH2 is a computer program providing inverse modeling capabilities for TOUGH2. TOUGH2 is a numerical simulation code for multi-dimensional coupled fluid and heat flow of multiphase, multicomponent fluid mixtures in porous and fractured media.
Date: October 1996
Creator: Finsterle, S.; Pruess, K. & Fraser, P.
Item Type: Refine your search to only Report
open access

ITOUGH2 user`s guide version 2.2

Description: ITOUGH2 is a program to estimate hydrogeologic model parameters for the numerical simulator TOUGH2. TOUGH2 was developed by Karsten Pruess at Lawrence Berkeley Laboratory for simulating non-isothermal flows of multicomponent, multiphase fluids in porous and fractured media. ITOUGH2 solves the inverse problem by automatic model calibration based on an indirect approach, in which some function of the difference between observed and model-predicted system response and appropriately weighted prior … more
Date: August 1, 1993
Creator: Finsterle, S.
Item Type: Refine your search to only Report
open access

ITOUGH2 V3.2 verification and validation report

Description: This report describes the Verification and Validation (V and V) test cases performed to qualify ITOUGH2 V3.2. ITOUGH2 V3.2 was installed in a directory {approximately}/itough2v3.2 on a SUN ULTRA 1 workstation under UNIX Solaris 2. Instructions for installing ITOUGH2 can be found in file read.me and the user`s manual. This report is structured as follows: for each functional requirement, the corresponding design is described, which may include the mathematical model implemented in ITOUGH2 V3.2, … more
Date: June 1, 1998
Creator: Finsterle, S.
Item Type: Refine your search to only Report
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ITP Filter Particulate Decontamination Measurement

Description: A new test method was developed which showed the installed In- Tank Precipitation Filter Unit {number_sign}3 provided at least 40, 000 x decontamination of the precipitated potassium tetraphenylborate (KTPB) during the cold chemical runs.This filter is expected to meet the needed 40,000 x hot cesium decontamination requirements, assuming that the cesium precipitate, CsTPB, behaves the same as KTPB. The new method permits cold chemicals field testing of installed filters to quantify particulate … more
Date: May 21, 1993
Creator: Dworjanyn, L.O.
Item Type: Refine your search to only Report
open access

ITP Filtrate Benzene Removal Alternatives

Description: Existing ITP filtrate hold tanks may provide sufficient capacity and residence time to strip dissolved benzene from the incoming filtrate using nitrogen sparging in the bottom of the old tanks. This is based on equilibrium supported by late Wash test data using aged washed slurry. Theoretical considerations indicate that benzene stripping will be more difficult from the ITP unwashed high salt filtrates due to reduced mass transfer. Therefore experimental sparging data is needed to quantify the … more
Date: May 21, 1993
Creator: Dworjanyn, L.O.
Item Type: Refine your search to only Report
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