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1

Definition: Delayed Fault Clearing | Open Energy Information  

Open Energy Info (EERE)

Related Terms protection system References Glossary of Terms Used in Reliability Standards An LikeLike UnlikeLike You like this.Sign Up to see what your friends like. inline...

2

High-level test synthesis for delay fault testability  

Science Conference Proceedings (OSTI)

A high-level test synthesis (HLTS) method targeted for delay fault testability is presented. The proposed method, when combined with hierarchical test pattern generation for embedded modules, guarantees 100% delay test coverage for detectable faults ...

Sying-Jyan Wang; Tung-Hua Yeh

2007-04-01T23:59:59.000Z

3

Sliding mode for detection and accommodation of computation time delay fault  

Science Conference Proceedings (OSTI)

Computation time delay in digital control systems reduces its robustness as well as degrades its performance. In this paper, the computation time delay is assumed to be constant and smaller than the sampling time and is treated as a fault to be detected, ... Keywords: Computation time delay, Discrete-time sliding mode control, Fault detection, Sliding mode observer

José Paulo F. Garcia; Lizete Maria C. F. Garcia; Gisele C. Apolinário; Fernando B. Rodrigues

2009-10-01T23:59:59.000Z

4

Analysis of Test Generation Complexity for Stuck-At and Path Delay Faults Based on ?k-Notation  

Science Conference Proceedings (OSTI)

In this paper, we discuss the relationship between the test generation complexity for path delay faults (PDFs) and that for stuck-at faults (SAFs) in combinational and sequential circuits using the recently introduced ?k-notation. On ... Keywords: easily testable, path delay faults, stuck-at faults, test generation complexity

Chia Yee Ooi; Thomas Clouqueur; Hideo Fujiwara

2007-08-01T23:59:59.000Z

5

Fault-Delayed Voltage Recovery Control with Plug-In Hybrid Electric Vehicles  

Science Conference Proceedings (OSTI)

This paper presents an investigation into the impact that plug-in hybrid electric vehicles (PHEVs) could have to mitigate the effects of fault-delayed voltage recovery. The energy storage and conversion system in PHEVs, given potentially high levels ...

Curtis Roe; Yousef M. Al-Abdullah; Dhwanil Desai; George K. Stefopoulos; George J. Cokkinides; A. P. Meliopoulos

2010-01-01T23:59:59.000Z

6

A 4000-A HVDC (high-voltage direct-current) circuit breaker with fast fault-clearing capability: Final report  

Science Conference Proceedings (OSTI)

This project is a follow-up of the first development of a 500 kV HVDC airblast circuit breaker (EPRI project 1507-3). The objective was to increase the current interrupting capability from 2200 A to 4000 A and shorten its fault clearing time. A high current 500 kV HVDC circuit breaker has been built using the passive commutation circuit. The breaker is modular in construction and can be designed for a wide variety of system conditions. More than 400 current interruptions were carried out successfully. Tests have shown that this circuit breaker is capable of interrupting more than 4000 A dc. Practical breakers with current interrupting capability of even 5500 A dc could be built. The circuit breaker operation and the fault-clearing process can be materially speeded up if the trip signal is given as soon as the fault is detected and without waiting for the current levels to come down in response to converter control action. The new dc breakers are shown to be capable of withstanding these transient arc currents of 8000 A without affecting its ability to interrupt the direct current that follows the transient. This transient current withstand capability is greater than is likely to occur during dc faults. The fault clearing time of this HVDC circuit breaker is comparable to the fault clearing time of conventional ac breakers for ac faults. The developed HVDC circuit breaker is now commercially available and can be supplied for use in HVDC systems. Its use in such systems is expected to provide flexibility in system design and contribute to system stability. 38 refs., 52 figs., 9 tabs.

Not Available

1988-04-01T23:59:59.000Z

7

Fault-Impact models based on delay and packet loss for IEEE 802.11g  

Science Conference Proceedings (OSTI)

In this paper we derive fault-impact models for wireless network traffic as it could be used in the control traffic for smart grid nodes. We set up experiments using a testbed with 116 nodes which uses the protocol IEEE 802.11g. We develop models for ...

Daniel Happ, Philipp Reinecke, Katinka Wolter

2013-08-01T23:59:59.000Z

8

Clear Skies  

NLE Websites -- All DOE Office Websites (Extended Search)

Clear Skies A. A. lacis NASA Goddard Space Flight Center Institute for Space Studies New York, NY 10025 "convective adjustment"takes place. Energy is transported upward within the...

9

Fault finder  

DOE Patents (OSTI)

A fault finder for locating faults along a high voltage electrical transmission line. Real time monitoring of background noise and improved filtering of input signals is used to identify the occurrence of a fault. A fault is detected at both a master and remote unit spaced along the line. A master clock synchronizes operation of a similar clock at the remote unit. Both units include modulator and demodulator circuits for transmission of clock signals and data. All data is received at the master unit for processing to determine an accurate fault distance calculation.

Bunch, Richard H. (1614 NW. 106th St., Vancouver, WA 98665)

1986-01-01T23:59:59.000Z

10

Clearing Debris from Land  

E-Print Network (OSTI)

After a hurricane or other severe storm, the largest task homeowners and business owners face is often clearing away the debris. These safety tips can help you avoid injury while removing trees and other debris from your property.

McFarland, Mark L.

2005-09-30T23:59:59.000Z

11

CLEARING OUT A GALAXY  

SciTech Connect

It is widely suspected that active galactic nucleus (AGN) activity ultimately sweeps galaxies clear of their gas. We work out the observable properties required to achieve this. Large-scale AGN-driven outflows should have kinetic luminosities {approx}{eta} L{sub Edd}/2 {approx} 0.05 L{sub Edd} and momentum rates {approx}20 L{sub Edd}/c, where L{sub Edd} is the Eddington luminosity of the central black hole and {eta} {approx} 0.1 its radiative accretion efficiency. This creates an expanding two-phase medium in which molecular species coexist with hot gas, which can persist after the central AGN has switched off. This picture predicts outflow velocities {approx}1000-1500 km s{sup -1} and mass outflow rates up to 4000 M{sub Sun} yr{sup -1} on kpc scales, fixed mainly by the host galaxy velocity dispersion (or equivalently black hole mass). All these features agree with those of outflows observed in galaxies such as Mrk231. This strongly suggests that AGN activity is what sweeps galaxies clear of their gas on a dynamical timescale and makes them red and dead. We suggest future observational tests of this picture.

Zubovas, Kastytis; King, Andrew, E-mail: ark@astro.le.ac.uk [Theoretical Astrophysics Group, University of Leicester, Leicester LE1 7RH (United Kingdom)

2012-02-15T23:59:59.000Z

12

Clearing Debris from Land (Spanish)  

E-Print Network (OSTI)

After a hurricane or other severe storm, the largest task homeowners and business owners face is often clearing away the debris. These safety tips can help you avoid injury while removing trees and other debris from your property.

McFarland, Mark L.

2007-10-08T23:59:59.000Z

13

Teleseismic-Seismic Monitoring At Clear Lake Area (Skokan, 1993) | Open  

Open Energy Info (EERE)

Clear Lake Area Clear Lake Area (Skokan, 1993) Exploration Activity Details Location Clear Lake Area Exploration Technique Teleseismic-Seismic Monitoring Activity Date Usefulness not indicated DOE-funding Unknown Notes Figure 4 illustrates seismicity from January of 1969 to June of 1977 (Rapolla and Keller, 1984). During this span, most of the seismicity occurred in the region of the Geysers geothermal field. Additional clustered activity was noted to the north and east of the Collayomi Fault in the Clear Lake region. Curiously, no unusual earthquake activity was noted along the major trend of the Collayomi Fault. Instead, the Collayomi Fault seems to separate two areas of active seismicity. References Catherine K. Skokan (1993) Overview Of Electromagnetic Methods Applied In Active Volcanic Areas Of Western United States

14

Metastability evaluation method by propagation delay distribution measurement  

Science Conference Proceedings (OSTI)

This paper suggests an experimental method for determining metastability properties based on deliberately inducing metastability in edge-triggered flip-flops. It offers the opportunity to analyze the impact of input signals time relationship on the output ... Keywords: MTBF, PLD, VLSI, analytical representation, asynchronous circuits, asynchronous logic, automatic data acquisition, complex architecture microsystems, custom CMOS, data acquisition, delays, edge-triggered flip-flops, failure analysis, fault diagnosis, fault events, flip-flop normal propagation delay, flip-flops, graphical representation, input signals time relationship, integrated circuit reliability, integrated propagation delay density distribution function, latch devices, logic design, logic testing, metastability, output signal timing characteristics, propagation delay density distribution function, propagation delay distribution measurement, reliability analysis, resolution time constant, statistical measurement

B. M. Rogina; B. Vojnovic

1995-11-01T23:59:59.000Z

15

Transient fault modeling and fault injection simulation  

E-Print Network (OSTI)

An accurate transient fault model is presented in this thesis. A 7-term exponential current upset model is derived from the results of a device-level, 3-dimensional, single-event-upset simulation. A curve-fitting algorithm is used to extract the numerical model from the empirical data. The model is implemented in a HSPICE simulation environment as a current-injection source for fault simulation. The current transient model is used to conduct electrical-level fault injection simulations on a static RAM cell and subcircuits from two commercial microprocessors. The results from the 7-term exponential model are compared with the results from the widely accepted double-exponential transient model. The experimental data indicate that, for a given charge level, the 7-term exponential fault model results in a higher chance of having a latch error. More importantly, different latch-error patterns are captured from the target circuits under the new fault model.

Yuan, Xuejun

1996-01-01T23:59:59.000Z

16

ClearWorld Now | Open Energy Information  

Open Energy Info (EERE)

ClearWorld Now Jump to: navigation, search Name ClearWorld Now Place Beijing, China Zip 100027 Product China-based operational investment arm of ClearWorld Energy Ltd. References...

17

ClearSpot Energy | Open Energy Information  

Open Energy Info (EERE)

Energy Jump to: navigation, search Name ClearSpot Energy Sector Solar Product US-based solar project developer for rooftop commercial installations. References ClearSpot...

18

The Impact of Delaying the Delay Announcements  

Science Conference Proceedings (OSTI)

Many service providers use delay announcements to inform customers of anticipated delays. However, this information is usually not provided immediately but after a short period of time (spent either waiting or occupied by the system). The focus of this ... Keywords: Noncooperative game, access control, admission control, queues, real-time information, strategic consumer, tandem queues

Gad Allon; Achal Bassamboo

2011-09-01T23:59:59.000Z

19

Fault Current Limiters  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Fault Fault Current Limiters Superconducting & Solid-state Power Equipment Office of Electricity Delivery and Energy Reliability www.oe.energy.gov Office of Electricity Delivery and Energy Reliability, OE-1 U.S. Department of Energy - 1000 Independence Avenue, SW - Washington, DC 20585 Plugging America Into the Future of Power What are FCLs? A fault is an unintentional short circuit, or partial short-circuit, in an electric circuit. A variety of factors such as lightning, downed power lines, or crossed power lines cause faults. During a fault, excessive current-called fault current- flows through the electrical system often resulting in a failure of one section of that system by causing a

20

Delay/Fault-Tolerant Mobile Sensor Network (DFT-MSN)  

E-Print Network (OSTI)

Tolerant Network (DTN) V. Cerf, S. Burleigh, A. Hooke, L. Torgerson, R. Durst, K. Scott, K. Fall, and H

Wu, Hongyi

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Delay sensing for long-term variations and defects monitoring in safety---critical applications  

Science Conference Proceedings (OSTI)

The impact of parametric variations on digital circuit performance is increasing in nanometer Integrated Circuits (IC), namely of Process, power supply Voltage and Temperature (PVT) variations. Moreover, circuit aging also impacts circuit performance, ... Keywords: Delay sensors, Failure prediction, Predictive delay fault detection, Process variations, Reliability in nanometer technologies

J. C. Vazquez; V. Champac; A. M. Ziesemer, Jr.; R. Reis; I. C. Teixeira; M. B. Santos; J. P. Teixeira

2012-02-01T23:59:59.000Z

22

Solar system fault detection  

DOE Patents (OSTI)

A fault detecting apparatus and method are provided for use with an active solar system. The apparatus provides an indication as to whether one or more predetermined faults have occurred in the solar system. The apparatus includes a plurality of sensors, each sensor being used in determining whether a predetermined condition is present. The outputs of the sensors are combined in a pre-established manner in accordance with the kind of predetermined faults to be detected. Indicators communicate with the outputs generated by combining the sensor outputs to give the user of the solar system and the apparatus an indication as to whether a predetermined fault has occurred. Upon detection and indication of any predetermined fault, the user can take appropriate corrective action so that the overall reliability and efficiency of the active solar system are increased.

Farrington, R.B.; Pruett, J.C. Jr.

1984-05-14T23:59:59.000Z

23

Solar system fault detection  

SciTech Connect

A fault detecting apparatus and method are provided for use with an active solar system. The apparatus provides an indication as to whether one or more predetermined faults have occurred in the solar system. The apparatus includes a plurality of sensors, each sensor being used in determining whether a predetermined condition is present. The outputs of the sensors are combined in a pre-established manner in accordance with the kind of predetermined faults to be detected. Indicators communicate with the outputs generated by combining the sensor outputs to give the user of the solar system and the apparatus an indication as to whether a predetermined fault has occurred. Upon detection and indication of any predetermined fault, the user can take appropriate corrective action so that the overall reliability and efficiency of the active solar system are increased.

Farrington, Robert B. (Wheatridge, CO); Pruett, Jr., James C. (Lakewood, CO)

1986-01-01T23:59:59.000Z

24

Recent earthquake sequences at Coso: Evidence for conjugate faulting and  

Open Energy Info (EERE)

earthquake sequences at Coso: Evidence for conjugate faulting and earthquake sequences at Coso: Evidence for conjugate faulting and stress loading near a geothermal field Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Recent earthquake sequences at Coso: Evidence for conjugate faulting and stress loading near a geothermal field Details Activities (1) Areas (1) Regions (0) Abstract: Two recent earthquake sequences near the Coso geothermal field show clear evidence of faulting along conjugate planes. We present results from analyzing an earthquake sequence occurring in 1998 and compare it with a similar sequence that occurred in 1996. The two sequences followed mainshocks that occurred on 27 November 1996 and 6 March 1998. Both mainshocks ruptured approximately colocated regions of the same fault

25

Optimal fault location  

E-Print Network (OSTI)

Basic goal of power system is to continuously provide electrical energy to the users. Like with any other system, failures in power system can occur. In those situations it is critical that correct remedial actions are applied as soon as possible after the accurate fault condition and location are detected. This thesis has been focusing on automated fault location procedure. Different fault location algorithms, classified according to the spatial placement of physical measurements on single ended, multiple ended and sparse system-wide, are investigated. As outcome of this review, methods are listed as function of different parameters that influence their accuracy. This comparison is than used for generating procedure for optimal fault location algorithm selection. According to available data, and position of the fault with respect to the data, proposed procedure decides between different algorithms and selects an optimal one. A new approach is developed by utilizing different data structures such as binary tree and serialization in order to efficiently implement algorithm decision engine. After accuracy of algorithms is strongly influenced by available input data, different data sources are recommended in proposed architecture such as the digital fault recorders, circuit breaker monitoring, SCADA, power system model and etc. Algorithm for determining faulted section is proposed based on the data from circuit breaker monitoring devices. This algorithm works in real time by recognizing to which sequence of events newly obtained recording belongs. Software prototype of the proposed automated fault location analysis is developed using Java programming language. Fault location analysis is automatically triggered by appearance of new event files in a specific folder. The tests were carried out using the real life transmission system as an example.

Knezev, Maja

2007-12-01T23:59:59.000Z

26

Fault Intersection | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Fault Intersection Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Fault Intersection Dictionary.png Fault Intersection: Fault intersections are junctions between normal faults and either transversely oriented strike-slip or oblique-slip faults. Subsurface fluid flow in these areas is enhanced by multiple minor faults that connect the major intersecting structures, forming highly fractured zones or dilational quadrants with increased permeability. Other definitions:Wikipedia Reegle Controlling Structures List of controlling structures typically associated with geothermal

27

VARIABLE TIME DELAY MEANS  

DOE Patents (OSTI)

An electrically variable time delay line is described which may be readily controlled simuitaneously with variable impedance matching means coupied thereto such that reflections are prevented. Broadly, the delay line includes a signal winding about a magnetic core whose permeability is electrically variable. Inasmuch as the inductance of the line varies directly with the permeability, the time delay and characteristic impedance of the line both vary as the square root of the permeability. Consequently, impedance matching means may be varied similariy and simultaneously w:th the electrically variable permeability to match the line impedance over the entire range of time delay whereby reflections are prevented.

Clemensen, R.E.

1959-11-01T23:59:59.000Z

28

Fault Locating, Prediction and Protection (FLPPS)  

Science Conference Proceedings (OSTI)

One of the main objectives of this DOE-sponsored project was to reduce customer outage time. Fault location, prediction, and protection are the most important aspects of fault management for the reduction of outage time. In the past most of the research and development on power system faults in these areas has focused on transmission systems, and it is not until recently with deregulation and competition that research on power system faults has begun to focus on the unique aspects of distribution systems. This project was planned with three Phases, approximately one year per phase. The first phase of the project involved an assessment of the state-of-the-art in fault location, prediction, and detection as well as the design, lab testing, and field installation of the advanced protection system on the SCE Circuit of the Future located north of San Bernardino, CA. The new feeder automation scheme, with vacuum fault interrupters, will limit the number of customers affected by the fault. Depending on the fault location, the substation breaker might not even trip. Through the use of fast communications (fiber) the fault locations can be determined and the proper fault interrupting switches opened automatically. With knowledge of circuit loadings at the time of the fault, ties to other circuits can be closed automatically to restore all customers except the faulted section. This new automation scheme limits outage time and increases reliability for customers. The second phase of the project involved the selection, modeling, testing and installation of a fault current limiter on the Circuit of the Future. While this project did not pay for the installation and testing of the fault current limiter, it did perform the evaluation of the fault current limiter and its impacts on the protection system of the Circuit of the Future. After investigation of several fault current limiters, the Zenergy superconducting, saturable core fault current limiter was selected for installation. Because of some testing problems with the Zenergy fault current limiter, installation was delayed until early 2009 with it being put into operation on March 6, 2009. A malfunction of the FCL controller caused the DC power supply to the superconducting magnet to be turned off. This inserted the FCL impedance into the circuit while it was in normal operation causing a voltage resonance condition. While these voltages never reached a point where damage would occur on customer equipment, steps were taken to insure this would not happen again. The FCL was reenergized with load on December 18, 2009. A fault was experienced on the circuit with the FCL in operation on January 14, 2010. The FCL operated properly and reduced the fault current by about 8%, what was expected from tests and modeling. As of the end of the project, the FCL was still in operation on the circuit. The third phase of the project involved the exploration of several advanced protection ideas that might be at a state where they could be applied to the Circuit of the Future and elsewhere in the SCE electrical system. Based on the work done as part of the literature review and survey, as well as a number of internal meetings with engineering staff at SCE, a number of ideas were compiled. These ideas were then evaluated for applicability and ability to be applied on the Circuit of the Future in the time remaining for the project. Some of these basic ideas were implemented on the circuit including measurement of power quality before and after the FCL. It was also decided that we would take what was learned as part of the Circuit of the Future work and extend it to the next generation circuit protection for SCE. Also at this time, SCE put in a proposal to the DOE for the Irvine Smart Grid Demonstration using ARRA funding. SCE was successful in obtaining funding for this proposal, so it was felt that exploration of new protection schemes for this Irvine Smart Grid Demonstration would be a good use of the project resources. With this in mind, a protection system that uses fault interrupting switches, hi

Yinger, Robert, J.; Venkata, S., S.; Centeno, Virgilio

2010-09-30T23:59:59.000Z

29

Digital time delay  

DOE Patents (OSTI)

Method and apparatus are provided for generating an output pulse following a trigger pulse at a time delay interval preset with a resolution which is high relative to a low resolution available from supplied clock pulses. A first lumped constant delay provides a first output signal at predetermined interpolation intervals corresponding to the desired high resolution time interval. Latching circuits latch the high resolution data to form a first synchronizing data set. A selected time interval has been preset to internal counters and corrected for circuit propagation delay times having the same order of magnitude as the desired high resolution. Internal system clock pulses count down the counters to generate an internal pulse delayed by an internal which is functionally related to the preset time interval. A second LCD corrects the internal signal with the high resolution time delay. A second internal pulse is then applied to a third LCD to generate a second set of synchronizing data which is complementary with the first set of synchronizing data for presentation to logic circuits. The logic circuits further delay the internal output signal with the internal pulses. The final delayed output signal thereafter enables the output pulse generator to produce the desired output pulse at the preset time delay interval following input of the trigger pulse.

Martin, A.D.

1986-05-09T23:59:59.000Z

30

Clear Lake Cogeneration LP | Open Energy Information  

Open Energy Info (EERE)

Cogeneration LP Jump to: navigation, search Name Clear Lake Cogeneration LP Place Idaho Utility Id 3775 References EIA Form EIA-861 Final Data File for 2010 - File220101...

31

Parallel fault backtracing for calculation of fault coverage  

Science Conference Proceedings (OSTI)

A new improved method for calculation of fault coverage with parallel fault backtracing in combinational circuits is proposed. The method is based on structurally synthesized BDDs (SSBDD) which represent gate-level circuits at higher, macro level where ...

Raimund Ubar; Sergei Devadze; Jaan Raik; Artur Jutman

2008-01-01T23:59:59.000Z

32

DIFFERENTIAL FAULT SENSING CIRCUIT  

DOE Patents (OSTI)

A differential fault sensing circuit is designed for detecting arcing in high-voltage vacuum tubes arranged in parallel. A circuit is provided which senses differences in voltages appearing between corresponding elements likely to fault. Sensitivity of the circuit is adjusted to some level above which arcing will cause detectable differences in voltage. For particular corresponding elements, a group of pulse transformers are connected in parallel with diodes connected across the secondaries thereof so that only voltage excursions are transmitted to a thyratron which is biased to the sensitivity level mentioned.

Roberts, J.H.

1961-09-01T23:59:59.000Z

33

Computer hardware fault administration  

DOE Patents (OSTI)

Computer hardware fault administration carried out in a parallel computer, where the parallel computer includes a plurality of compute nodes. The compute nodes are coupled for data communications by at least two independent data communications networks, where each data communications network includes data communications links connected to the compute nodes. Typical embodiments carry out hardware fault administration by identifying a location of a defective link in the first data communications network of the parallel computer and routing communications data around the defective link through the second data communications network of the parallel computer.

Archer, Charles J. (Rochester, MN); Megerian, Mark G. (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian E. (Rochester, MN)

2010-09-14T23:59:59.000Z

34

Dynamic Fault Detection Chassis  

Science Conference Proceedings (OSTI)

Abstract The high frequency switching megawatt-class High Voltage Converter Modulator (HVCM) developed by Los Alamos National Laboratory for the Oak Ridge National Laboratory's Spallation Neutron Source (SNS) is now in operation. One of the major problems with the modulator systems is shoot-thru conditions that can occur in a IGBTs H-bridge topology resulting in large fault currents and device failure in a few microseconds. The Dynamic Fault Detection Chassis (DFDC) is a fault monitoring system; it monitors transformer flux saturation using a window comparator and dV/dt events on the cathode voltage caused by any abnormality such as capacitor breakdown, transformer primary turns shorts, or dielectric breakdown between the transformer primary and secondary. If faults are detected, the DFDC will inhibit the IGBT gate drives and shut the system down, significantly reducing the possibility of a shoot-thru condition or other equipment damaging events. In this paper, we will present system integration considerations, performance characteristics of the DFDC, and discuss its ability to significantly reduce costly down time for the entire facility.

Mize, Jeffery J [ORNL

2007-01-01T23:59:59.000Z

35

Downhole delay assembly for blasting with series delay  

DOE Patents (OSTI)

A downhole delay assembly is provided which can be placed into a blasthole for initiation of explosive in the blasthole. The downhole delay assembly includes at least two detonating time delay devices in series in order to effect a time delay of longer than about 200 milliseconds in a round of explosions. The downhole delay assembly provides a protective housing to prevent detonation of explosive in the blasthole in response to the detonation of the first detonating time delay device. There is further provided a connection between the first and second time delay devices. The connection is responsive to the detonation of the first detonating time delay device and initiates the second detonating time delay device. A plurality of such downhole delay assemblies are placed downhole in unfragmented formation and are initiated simultaneously for providing a round of explosive expansions. The explosive expansions can be used to form an in situ oil shale retort containing a fragmented permeable mass of formation particles.

Ricketts, Thomas E. (Grand Junction, CO)

1982-01-01T23:59:59.000Z

36

Effect of HVDC line faults on transient torsional torques of turbine-generator shafts  

SciTech Connect

This paper investigates the effects of HVdc line faults, line de-energization, and line re-energization on the transient torsional stresses of steam turbine-generator (T-G) units. The studies are conducted on a bipole HVdc system which connects a T-G set to a large ac system. The shaft transient stresses of the T-G set as a result of HVac line fault, fault clearing, and automatic reclosure are also determined when the HVdc transmission system is replaced by an equivalent double-line HVac system. The EMTDC program is used for the simulation studies. The studies conclude that transient shaft stresses as a result of HVdc line fault and its subsequent switching events are (1) significantly less severe than those of HVac faults and subsequent switchings, and (2) not sensitive to the fault location and disturbance duration.

Shi, W. (Xi'an Jiaotong Univ. (China). Dept. of Electrical Engineering); Iravani, M.R. (Univ. of Toronto, Ontario (Canada). Dept. of Electrical Engineering)

1994-08-01T23:59:59.000Z

37

Constructions of fault tolerant linear compressors and linear decompressors  

E-Print Network (OSTI)

Abstract — The constructions of optical buffers is one of the most critically sought after optical technologies in all-optical packet-switched networks, and constructing optical buffers directly via optical Switches and fiber Delay Lines (SDL) has received a lot of attention recently in the literature. A practical and challenging issue of the constructions of optical buffers that has not been addressed before is on the fault tolerant capability of such constructions. In this paper, we focus on the constructions of fault tolerant linear compressors and linear decompressors. The basic network element for our constructions is scaled optical memory cell, which is constructed by a 2 × 2 optical crossbar switch and a fiber delay line. We give a multistage construction of a self-routing linear compressor by a concatenation of scaled optical memory cells. We also show that if the delays, say d1, d2,..., dM, of the fibers in the scaled optical memory cells satisfy a certain condition (specifically, the condition in (A2) given in Section I), then our multistage construction can be operated as a self-routing linear compressor with maximum delay ? M?F even after up to F of the M scaled optical memory cells fail to function properly, where 0 ? F ? M ? 1. Furthermore, we prove that our multistage construction with the fiber delays d1, d2,..., dM given by the generalized Fibonacci series of order F is the best among all constructions of a linear compressor that can tolerate up to F faulty scaled optical memory cells by using M scaled optical memory cells. Similarly results are also obtained for the constructions of fault tolerant linear decompressors. I.

Cheng-shang Chang; Tsz-hsuan Chao; Jay Cheng; Duan-shin Lee

2007-01-01T23:59:59.000Z

38

Clear Wind Renewable Power | Open Energy Information  

Open Energy Info (EERE)

Clear Wind Renewable Power Clear Wind Renewable Power Place Minneapolis, Minnesota Zip 55416 Sector Wind energy Product Clear Wind focuses its efforts on projects ranging in size from 5 to 50MW in the midwest US. Coordinates 44.979035°, -93.264929° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":44.979035,"lon":-93.264929,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

39

Vertical Mixing in Clear Air and Clouds  

Science Conference Proceedings (OSTI)

The realization that clouds are diluted by the entrainment of dry air from outside the cloud boundaries began more than 40 years ago. Cloud-top entrainment was first clearly recognized by Squires in 1958. Warner and Squires showed that the ...

James W. Telford; Steven K. Chai

1993-04-01T23:59:59.000Z

40

Book review A Clear View of  

E-Print Network (OSTI)

Magazine R1 Book review A Clear View of the Cell Cycle James E. Ferrell, Jr. The Cell Cycle." It was a timely book, coming right on the heels of the discovery that cyclin-dependent kinases (Cdks) drive cell book. Enter "The Cell Cycle: Principles of Control", by David Morgan, just published by New Science

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

On the design of communication-aware fault-tolerant scheduling algorithms for precedence constrained tasks in grid computing systems with dedicated communication devices  

Science Conference Proceedings (OSTI)

Fault-tolerant scheduling is an imperative step for large-scale computational Grid systems, as often geographically distributed nodes co-operate to execute a task. By and large, primary-backup approach is a common methodology used for fault tolerance ... Keywords: Communication delay, Directed acyclic graphs, Grid computing, Primary-backup, Replication cost, Response time

Qin Zheng; Bharadwaj Veeravalli

2009-03-01T23:59:59.000Z

42

Fault Current Management Guidebook - Updated  

Science Conference Proceedings (OSTI)

Under the new paradigm of power market operation, electric utilities are forcing more power through the existing transmission lines; and these increased loads will increase the fault current level throughout the power system. Also, new generation sources including distributed generation added at the transmission and distribution network will increase power flows and, consequently, fault current levels. Under increased power flow conditions on the existing assets, managing fault currents is crucial in ord...

2007-12-20T23:59:59.000Z

43

Clear Power Ventures | Open Energy Information  

Open Energy Info (EERE)

Clear Power Ventures Clear Power Ventures Place Boston, Massachusetts Product Venture development firm focused on deals in the cleantech market. Coordinates 42.358635°, -71.056699° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.358635,"lon":-71.056699,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

44

Clear Lake Geothermal Area | Open Energy Information  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Clear Lake Geothermal Area (Redirected from Clear Lake Area) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermal Resource Area: Clear Lake Geothermal Area Contents 1 Area Overview 2 History and Infrastructure 3 Regulatory and Environmental Issues 4 Exploration History 5 Well Field Description 6 Geology of the Area 7 Geofluid Geochemistry 8 NEPA-Related Analyses (0) 9 Exploration Activities (9) 10 References Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":6,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"300px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":39.01666667,"lon":-122.65,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

45

Clear Lake Geothermal Area | Open Energy Information  

Open Energy Info (EERE)

Clear Lake Geothermal Area Clear Lake Geothermal Area Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermal Resource Area: Clear Lake Geothermal Area Contents 1 Area Overview 2 History and Infrastructure 3 Regulatory and Environmental Issues 4 Exploration History 5 Well Field Description 6 Geology of the Area 7 Geofluid Geochemistry 8 NEPA-Related Analyses (0) 9 Exploration Activities (9) 10 References Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":6,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"300px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":39.01666667,"lon":-122.65,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

46

Fault Mapping | Open Energy Information  

Open Energy Info (EERE)

form form View source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit with form History Facebook icon Twitter icon » Fault Mapping Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Technique: Fault Mapping Details Activities (2) Areas (2) Regions (0) NEPA(0) Exploration Technique Information Exploration Group: Field Techniques Exploration Sub Group: Data Collection and Mapping Parent Exploration Technique: Data Collection and Mapping Information Provided by Technique Lithology: Stratigraphic/Structural: Locates active faults in the area of interest Hydrological: Can reveal whether faults are circulating hydrothermal fluids Thermal: Dictionary.png

47

Congestion delays at hub airports  

E-Print Network (OSTI)

A deterministic model was developed to study the effects of inefficient scheduling on flight delays at hub airports. The model bases the delay calculation on published schedule data and on user-defined airport capacities. ...

St. George, Martin J.

1986-01-01T23:59:59.000Z

48

Major Normal Fault | Open Energy Information  

Open Energy Info (EERE)

Major Normal Fault Major Normal Fault Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Major Normal Fault Dictionary.png Major Normal Fault: Normal faults are structures in which the hanging wall is down dropped along the fault plane relative to the foot wall. They are the predominant type of structure in extensional tectonic environments, but are commonly encountered in a number of geologic settings. Other definitions:Wikipedia Reegle Controlling Structures List of controlling structures typically associated with geothermal systems: Major Normal Fault Termination of a Major Normal Fault Stepover or Relay Ramp in Normal Fault Zones Apex or Salient of Normal Fault Fault Intersection Accommodation Zone Displacement Transfer Zone Pull-Apart in Strike-Slip Fault Zone

49

Multiple signal fault detection using fuzzy logic  

Science Conference Proceedings (OSTI)

In this paper, we describe a multiple Signal Fault Detection system that employs fuzzy logic at two levels of detection: signal segment fault and signal fault. The system involves signal segmentation, feature extraction and fuzzy logic based segment ...

Yi Lu Murphey; Jacob Crossman; ZhiHang Chen

2003-06-01T23:59:59.000Z

50

A robust fault-tolerant control strategy for networked control systems  

Science Conference Proceedings (OSTI)

Networked control systems (NCS) are one type of distributed control systems where serial communication networks is used to exchange system information and control signals between various physical components of the systems that may be physically distributed. ... Keywords: Deadbands, Networked control systems (NCS), Random time delays, Robust fault-tolerant control, T-S fuzzy modeling

Huo Zhihong; Zheng Yuan; Xu Chang

2011-03-01T23:59:59.000Z

51

Programmable Differential Delay Circuit With Fine Delay Adjustment  

DOE Patents (OSTI)

Circuitry that provides additional delay to early arriving signals such that all data signals arrive at a receiving latch with same path delay. The delay of a forwarded clock reference is also controlled such that the capturing clock edge will be optimally positioned near quadrature (depending on latch setup/hold requirements). The circuitry continuously adapts to data and clock path delay changes and digital filtering of phase measurements reduce errors brought on by jittering data edges. The circuitry utilizes only the minimum amount of delay necessary to achieve objective thereby limiting any unintended jitter. Particularly, this programmable differential delay circuit with fine delay adjustment is designed to allow the skew between ASICS to be minimized. This includes skew between data bits, between data bits and clocks as well as minimizing the overall skew in a channel between ASICS.

DeRyckere, John F. (Eau Claire, WI); Jenkins, Philip Nord (Eau Claire, WI); Cornett, Frank Nolan (Chippewa Falls, WI)

2002-07-09T23:59:59.000Z

52

Definition: Enhanced Fault Protection | Open Energy Information  

Open Energy Info (EERE)

Enhanced Fault Protection Enhanced Fault Protection Enhanced fault protection requires higher precision and greater discrimination of fault location and type with coordinated measurement among multiple devices. For distribution applications, these systems will detect and isolate faults without full-power re-closing, reducing the frequency of through-fault currents. Using high resolution sensors and fault signatures, these systems can better detect high impedance faults. For transmission applications, these systems will employ high speed communications between multiple elements (e.g., stations) to protect entire regions, rather than just single elements. They will also use the latest digital techniques to advance beyond conventional impedance relaying of transmission lines.[1] Related Terms

53

Definition: Fault Mapping | Open Energy Information  

Open Energy Info (EERE)

Mapping Jump to: navigation, search Dictionary.png Fault Mapping Faults are structural features of crustal rocks that are caused by tectonic forces. These features can create...

54

Low cost fault detection system for railcars and tracks  

E-Print Network (OSTI)

A "low cost fault detection system" that identifies wheel flats and defective tracks is explored here. This is achieved with the conjunction of sensors, microcontrollers and Radio Frequency (RF) transceivers. The objective of the proposed research is to identify faults plaguing railcars and to be able to clearly distinguish the faults of a railcar from the inherent faults in the track. The focus of the research though, is mainly to identify wheel flats and defective tracks. The thesis has been written with the premise that the results from the simulation software GENSYS are close to the real time data that would have been obtained from an actual railcar. Based on the results of GENSYS, a suitable algorithm is written that helps segregate a fault in a railcar from a defect in a track. The above code is implemented using hardware including microcontrollers, accelerometers, RF transceivers and a real time monitor. An enclosure houses the system completely, so that it is ready for application in a real environment. This also involves selection of suitable hardware so that there is a uniform source of power supply that reduces the cost and assists in building a robust system.

Vengalathur, Sriram T.

2003-08-01T23:59:59.000Z

55

Clear Creek Geothermal Area | Open Energy Information  

Open Energy Info (EERE)

Geothermal Area Geothermal Area Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Geothermal Resource Area: Clear Creek Geothermal Area Contents 1 Area Overview 2 History and Infrastructure 3 Regulatory and Environmental Issues 4 Exploration History 5 Well Field Description 6 Geology of the Area 7 Geofluid Geochemistry 8 NEPA-Related Analyses (0) 9 Exploration Activities (0) 10 References Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"TERRAIN","zoom":6,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"500px","height":"300px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":64.85,"lon":-162.3,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

56

Observer-based fault detection for nuclear reactors  

E-Print Network (OSTI)

This is a study of fault detection for nuclear reactor systems. Basic concepts are derived from fundamental theories on system observers. Different types of fault- actuator fault, sensor fault, and system dynamics fault ...

Li, Qing, 1972-

2001-01-01T23:59:59.000Z

57

Arc fault detection system  

DOE Patents (OSTI)

An arc fault detection system for use on ungrounded or high-resistance-grounded power distribution systems is provided which can be retrofitted outside electrical switchboard circuits having limited space constraints. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load side of the switchboard. When such a current differential is experienced, a current travels through a operating coil of the differential current relay, which in turn opens an upstream circuit breaker located between the switchboard and a power supply to remove the supply of power to the switchboard.

Jha, Kamal N. (Bethel Park, PA)

1999-01-01T23:59:59.000Z

58

Arc fault detection system  

DOE Patents (OSTI)

An arc fault detection system for use on ungrounded or high-resistance-grounded power distribution systems is provided which can be retrofitted outside electrical switchboard circuits having limited space constraints. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load side of the switchboard. When such a current differential is experienced, a current travels through a operating coil of the differential current relay, which in turn opens an upstream circuit breaker located between the switchboard and a power supply to remove the supply of power to the switchboard. 1 fig.

Jha, K.N.

1999-05-18T23:59:59.000Z

59

Monitoring crustal deformation in The Geysers-Clear Lake geothermal area, California  

DOE Green Energy (OSTI)

Geodetic surveys since 1972-1973 reveal significant crustal deformation in The Geysers-Clear Lake region. Resurveys of precise control networks are measuring both vertical and horizontal ground movement, with most of the change continuing in the area of geothermal fluid withdrawal. Preliminary evidence suggests right-lateral horizontal movement on northwest-trending fault systems and vertical and horizontal compression of the deep geothermal reservoir system. A direct correlaton is suggested between ground-surface deformation and subsurface pressure changes in the reservoir system. Although surface changes appear too small to be of environmental concern in The Geysers-Clear Lake region, they indicate hydrodynamic changes in the reservoir of significant import.

Lofgren, B.E.

1978-01-01T23:59:59.000Z

60

Evaluation of a New Operational Technique for Producing Clear Radiances  

Science Conference Proceedings (OSTI)

To produce atmospheric temperature profiles from measurements of infrared data, it is necessary to obtain infrared radiances for clear areas. Clear radiances are obtained either by identifying spots that are completely clear or by extracting ...

L. M. McMillin; C. Dean

1982-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

EPRI Fault Current Management Guidebook, Fifth Edition  

Science Conference Proceedings (OSTI)

This document is an update of EPRI report 1020029, Fault Current Management Guidebook, Fourth Edition, on fault current effects and management in transmission and distribution systems. This guide is intended to be a snapshot of available references, information, and literature on the effects of high fault current on a number of power system components and various available and emerging fault-current-limiting technologies.

2011-12-19T23:59:59.000Z

62

Memory Fault Modeling Trends: A Case Study  

Science Conference Proceedings (OSTI)

In recent years, embedded memories are the fastest growing segment of system on chip. They therefore have a major impact on the overall Defect per Million (DPM). Further, the shrinking technologies and processes introduce new defects that cause previously ... Keywords: data backgrounds, dynamic faults, fault coverage, fault models, memory tests, static faults

Said Hamdioui; Rob Wadsworth; John Delos Reyes; Ad J. Van De Goor

2004-06-01T23:59:59.000Z

63

Delayed cure bismaleimide resins  

DOE Patents (OSTI)

Polybismaleimides prepared by delayed curing of bis-imides having the formula ##STR1## wherein R.sub.1 and R.sub.2 each independently is H, C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy, Cl or Br, or R.sub.1 and R.sub.2 together form a fused 6-membered hydrocarbon aromatic ring, with the proviso that R.sub.1 and R.sub.2 are not t-butyl or t-butoxy; X is O, S or Se; n is 1-3; and the --(CH.sub.2).sub.n -- group, optionally, is substituted by 1-3 methyl groups or by fluorine.

Adams, Johnnie E. (Grandview, MO); Jamieson, Donald R. (Merriam, KS)

1984-08-07T23:59:59.000Z

64

Fault Tree Analysis - A Bibliography  

Science Conference Proceedings (OSTI)

Fault tree analysis is a top-down approach to the identification of process hazards. It is touted as one of the best methods for systematically identifying and graphically displaying the many ways something can go wrong. This bibliography references ...

Program NASA Scientific and Technical Information

2000-07-01T23:59:59.000Z

65

SWIFT: Software Implemented Fault Tolerance  

Science Conference Proceedings (OSTI)

To improve performance and reduce power, processor designers employ advances that shrink feature sizes, lower voltage levels, reduce noise margins, and increase clock rates. However, these advances make processors more susceptible to transient faults ...

George A. Reis; Jonathan Chang; Neil Vachharajani; Ram Rangan; David I. August

2005-03-01T23:59:59.000Z

66

MI Gap Clearing Kicker Magnet Design Review  

SciTech Connect

The kicker system requirements were originally conceived for the NOvA project. NOvA is a neutrino experiment located in Minnesota. To achieve the desired neutrino flux several upgrades are required to the accelerator complex. The Recycler will be used as a proton pre-injector for the Main Injector (MI). As the Recycler is the same size as the MI, it is possible to do a single turn fill ({approx}11 {micro}sec), minimizing the proton injection time in the MI cycle and maximizing the protons on target. The Recycler can then be filled with beam while the MI is ramping to extract beam to the target. To do this requires two new transfer lines. The existing Recycler injection line was designed for 10{pi} pbar beams, not the 20{pi} proton beams we anticipate from the Booster. The existing Recycler extraction line allows for proton injection through the MI, while we want direct injection from the Booster. These two lines will be decommissioned. The new injection line from the MI8 line into the Recycler will start at 848 and end with injection kickers at RR104. The new extraction line in the RR30 straight section will start with a new extraction kicker at RR232 and end with new MI injection kickers at MI308. Finally, to reduce beam loss activation in the enclosure, a new gap clearing kicker will be used to extract uncaptured beam created during the slip stack injection process down the existing dump line. It was suggested that the MI could benefit from this type of system immediately. This led to the early installation of the gap clearing system in the MI, followed by moving the system to Recycler during NOvA. The specifications also changed during this process. Initially the rise and fall time requirements were 38 ns and the field stability was {+-}1%. The 38 ns is based on having a gap of 2 RF buckets between injections. (There are 84 RF buckets that can be filled from the Booster for each injection, but 82 would be filled with beam. MI and Recycler contain 588 RF buckets.) A rough cost/benefit analysis showed that increasing the number of empty buckets to 3 decreased the kicker system cost by {approx}30%. This could be done while not extending the running time since this is only a 1% reduction in protons per pulse, hence the rise and fall time are now 57 ns. Additionally, the {+-}1% tolerance would have required a fast correction kicker while {+-}3% could be achieved without this kicker. The loosened tolerance was based on experience on wide band damping systems in the MI. A higher power wideband damping system is a better use of the resources as it can be used to correct for multiple sources of emittance growth. Finally, with the use of this system for MI instead of Recycler, the required strength grew from 1.2 mrad to 1.7 mrad. The final requirements for this kicker are listed.

Jensen, Chris; /Fermilab

2008-10-01T23:59:59.000Z

67

PRECISION TIME-DELAY CIRCUIT  

DOE Patents (OSTI)

A tine-delay circuit which produces a delay time in d. The circuit a capacitor, an te back resistance, connected serially with the anode of the diode going to ground. At the start of the time delay a negative stepfunction is applied to the series circuit and initiates a half-cycle transient oscillatory voltage terminated by a transient oscillatory voltage of substantially higher frequency. The output of the delay circuit is taken at the junction of the inductor and diode where a sudden voltage rise appears after the initiation of the higher frequency transient oscillations.

Creveling, R.

1959-03-17T23:59:59.000Z

68

Passive fault current limiting device  

DOE Patents (OSTI)

A passive current limiting device and isolator is particularly adapted for use at high power levels for limiting excessive currents in a circuit in a fault condition such as an electrical short. The current limiting device comprises a magnetic core wound with two magnetically opposed, parallel connected coils of copper, a high temperature superconductor or other electrically conducting material, and a fault element connected in series with one of the coils. Under normal operating conditions, the magnetic flux density produced by the two coils cancel each other. Under a fault condition, the fault element is triggered to cause an imbalance in the magnetic flux density between the two coils which results in an increase in the impedance in the coils. While the fault element may be a separate current limiter, switch, fuse, bimetal strip or the like, it preferably is a superconductor current limiter conducting one-half of the current load compared to the same limiter wired to carry the total current of the circuit. The major voltage during a fault condition is in the coils wound on the common core in a preferred embodiment. 6 figs.

Evans, D.J.; Cha, Y.S.

1999-04-06T23:59:59.000Z

69

High resolution digital delay timer  

DOE Patents (OSTI)

Method and apparatus are provided for generating an output pulse following a trigger pulse at a time delay interval preset with a resolution which is high relative to a low resolution available from supplied clock pulses. A first lumped constant delay (20) provides a first output signal (24) at predetermined interpolation intervals corresponding to the desired high resolution time interval. Latching circuits (26, 28) latch the high resolution data (24) to form a first synchronizing data set (60). A selected time interval has been preset to internal counters (142, 146, 154) and corrected for circuit propagation delay times having the same order of magnitude as the desired high resolution. Internal system clock pulses (32, 34) count down the counters to generate an internal pulse delayed by an interval which is functionally related to the preset time interval. A second LCD (184) corrects the internal signal with the high resolution time delay. A second internal pulse is then applied to a third LCD (74) to generate a second set of synchronizing data (76) which is complementary with the first set of synchronizing data (60) for presentation to logic circuits (64). The logic circuits (64) further delay the internal output signal (72) to obtain a proper phase relationship of an output signal (80) with the internal pulses (32, 34). The final delayed output signal (80) thereafter enables the output pulse generator (82) to produce the desired output pulse (84) at the preset time delay interval following input of the trigger pulse (10, 12).

Martin, Albert D. (Los Alamos, NM)

1988-01-01T23:59:59.000Z

70

Fault detection of fault ride through for doubly-fed induction generator based wind energy systems.  

E-Print Network (OSTI)

??Fault detection and mitigation is of high importance for existing DFIG based wind energy conversion systems. Keeping the doubly-fed induction generator (DFIG) online during faults… (more)

Ramroop, Shoba AD

2008-01-01T23:59:59.000Z

71

Automatic fault extraction and simulation of layout realistic faults for integrated analogue circuits  

Science Conference Proceedings (OSTI)

A comprehensive tool has been implemented for the comparison of different test preparation techniques and target faults. It comprises of the realistic fault characterisation program LIFT that can extract sets of various faults from a given analogue or ... Keywords: AnaFAUL, LIFT, VCO, analogue integrated circuits, automatic analogue fault simulation program, catastrophic faults, circuit analysis computing, circuit layout, fault diagnosis, integrated analogue circuits, integrated circuit layout, integrated circuit testing, mixed analogue-digital integrated circuits, mixed-signal circuit, parametric faults, realistic fault characterisation program, simulation, test preparation, voltage-controlled oscillators

C. Sebeke; J. P. Teixeira; M. J. Ohletz

1995-03-01T23:59:59.000Z

72

Petrologic considerations for hot dry rock geothermal site selection in the Clear Lake Region, California  

DOE Green Energy (OSTI)

The Clear Lake area is well known for anomalous heat flow, thermal springs, hydrothermal mineral deposits, and Quaternary volcanism. These factors, along with the apparent lack of a large reservoir of geothermal fluid north of Collayomi fault make the Clear Lake area an attractive target for hot dry rock (HDR) geothermal development. Petrologic considerations provide some constraints on site selection for HDR development. Spatial and temporal trends in volcanism in the Coast Ranges indicate that magmatism has migrated to the north with time, paralleling passage of the Mendocino triple junction and propagation of the San Andreas fault. Volcanism in the region may have resulted from upwelling of hot asthenosphere along the southern margin of the subducted segment of the Gorda plate. Spatial and temporal trends of volcanism within the Clear Lake volcanic field are similar to larger-scale trends of Neogene volcanism in the Cost Ranges. Volcanism (especially for silicic compositions) shows a general migration to the north over the {approximately}2 Ma history of the field, with the youngest two silicic centers located at Mt. Konocti and Borax Lake. The Mt. Konocti system (active from {approximately} 0.6 to 0.3 Ma) was large and long-lived, whereas the Borax Lake system is much smaller but younger (0.09 Ma). Remnants of silicic magma bodies under Mt. Konocti may be in the latter stages of cooling, whereas a magma body centered under Borax Lake may be in the early stages of development. The existence of an upper crustal silicic magma body of under Borax Lake has yet to be demonstrated by passive geophysics, however, subsurface temperatures in the area as high (> 200{degrees}C at 2000 m) as those beneath the Mt. Konocti area. Based on petrologic considerations alone, the Mt. Konocti-Borax Lake area appears to be the most logical choice for HDR geothermal development in the region.

Stimac, J.; Goff, F. (Los Alamos National Lab., NM (United States)); Hearn, B.C. Jr. (US Geological Survey, Reston, VA, Branch of Lithospheric Processes (United States))

1992-01-01T23:59:59.000Z

73

Revisiting TCP congestion control using delay gradients  

Science Conference Proceedings (OSTI)

Traditional loss-based TCP congestion control (CC) tends to induce high queuing delays and perform badly across paths containing links that exhibit packet losses unrelated to congestion. Delay-based TCP CC algorithms infer congestion from delay measurements ...

David A. Hayes; Grenville Armitage

2011-05-01T23:59:59.000Z

74

Communication link with constant delay  

DOE Patents (OSTI)

This is a technique that enables the transmission of data on a transmission and reception of data. A programmable delay element is fixed in the transmission line and programmed to add or subtract an appropriate amount of delay to compensate for changes and thereby maintain the overall delay at a predetermined value. The electrical transmission system is coupled via an optical coupler to a fiber optic line. The destination of the fiber optic line is equipped with a means for reflecting a portion of the transmitted information so as to provide an indication of a round trip delay at the transmitting end. By using continuous time compensation, the communication does not distort information as a phase compensated system would do, and also allows higher accuracy for synchronization between transmitter and receiver.

Miller, S.A.

1991-01-01T23:59:59.000Z

75

Improved Mapping of Tropospheric Delays  

Science Conference Proceedings (OSTI)

The authors compare several methods to map the a priori tropospheric delay of global positioning system (GPS) signals from the zenith direction to lower elevations. This is commonly achieved with so-called mapping functions. Dry mapping functions ...

Christian Rocken; Sergey Sokolovskiy; James M. Johnson; Doug Hunt

2001-07-01T23:59:59.000Z

76

Definition: Fault Current Limiter | Open Energy Information  

Open Energy Info (EERE)

Limiter Limiter Jump to: navigation, search Dictionary.png Fault Current Limiter A fault current limiter prevents current in an electrical circuit from exceeding a predetermined level by increasing the electrical impedance of that circuit before the current through the circuit exceeds that level. Fault current limiters are designed so as to minimize the impedance of the circuit under normal conditions to reduce losses, but increase the impedance of the circuit under fault conditions to limit fault current.[1] View on Wikipedia Wikipedia Definition A Fault Current Limiter (FCL) is a device which limits the prospective fault current when a fault occurs (e.g. in a power transmission network). The term includes superconducting devices and non-superconducting devices, however some of the more simple non-superconducting devices (such

77

Definition: Fault Current Limiting | Open Energy Information  

Open Energy Info (EERE)

Limiting Limiting Jump to: navigation, search Dictionary.png Fault Current Limiting Fault current limiting can be achieved through sensors, communications, information processing, and actuators that allow the utility to use a higher degree of network coordination to reconfigure the system to prevent fault currents from exceeding damaging levels. Fault current limiting can also be achieved through the implementation of special stand alone devices known as Fault Current Limiters (FCLs) which act to automatically limit high through currents that occur during faults.[1] Related Terms fault, fault current limiter References ↑ SmartGrid.gov 'Description of Functions' Temp LikeLike UnlikeLike You like this.Sign Up to see what your friends like. late:ISGANAttributionsmart grid,smart grid,smart grid,smart grid,

78

Quaternary faulting of Deschutes County, Oregon.  

E-Print Network (OSTI)

??Sixty-one normal faults were identified in a 53-kilometer long by 21-kilometer wide northwest-trending zone in central and northern Deschutes County, Oregon. The faults are within… (more)

Wellik, John M.

2008-01-01T23:59:59.000Z

79

CCBP: CLEAR COMMUNICATION SKILLS FOR MANAGERS AND SUPERVISORS...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

CLEAR COMMUNICATION SKILLS FOR MANAGERS AND SUPERVISORS CCBP: CLEAR COMMUNICATION SKILLS FOR MANAGERS AND SUPERVISORS November 6, 2013 8:30AM EST to November 7, 2013 4:00PM EST...

80

Fault diagnosis and fault tolerant control using set-membership approaches: Application to real case studies  

Science Conference Proceedings (OSTI)

This paper reviews the use of set-membership methods in fault diagnosis (FD) and fault tolerant control (FTC). Setmembership methods use a deterministic unknown-but-bounded description of noise and parametric uncertainty (interval ... Keywords: Fault Detection, Fault-Tolerant Control, Interval Models, Robustness, Set-Membership

Vicenç Puig

2010-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Application of Control Charts for Detecting Faults in Variable ...  

Science Conference Proceedings (OSTI)

... where Tzone = zone temperature, CSP = cooling setpoint ... Fault Implementation and Impact To test ... fault imple- mentations and impacts are provided ...

82

Distribution Fault Location and Waveform Characterization  

Science Conference Proceedings (OSTI)

Automated fault location algorithms for distribution systems require monitoring equipment to record voltage and current waveforms during an event. In addition, most of these algorithms require circuit-impedance parameters to evaluate the fault location. Locating incipient faults and fault waveform characterization is the main aim of this project. This project builds on work done in 2008 towards sub-cycle blip identification using an algorithm based on arc voltage.

2009-12-11T23:59:59.000Z

83

Benchmarking of Fault-Location Technologies  

Science Conference Proceedings (OSTI)

This report resumes the studies on fault-location technologies that were conducted in 2009. These studies were undertaken in a joint project done with the collaboration of Hydro-Qubec, Long Island Power Authority, and the Electric Power Research Institute (EPRI). Two fault-location technologies were tested, the Reactance to Fault (RTF) implemented in the PQView application and the Voltage Drop Fault Location (VDFL) implemented in the MILE application. The RTF is based on substation voltage and current me...

2011-03-31T23:59:59.000Z

84

Verification of clear-air turbulence forecasts June 2002, KNMI  

E-Print Network (OSTI)

to increase potential energy. Under these conditions turbulence will increase in intensity until different weather conditions. It often occurs in relatively clear skies and is then referred to as clear-airVerification of clear-air turbulence forecasts A. Overeem June 2002, KNMI Technisch rapport #12

Stoffelen, Ad

85

Fault detection and diagnosis of technical systems  

Science Conference Proceedings (OSTI)

Sensors, actuators and/or physical components in technical systems are often affected by unpermitted or un-expected deviations from normal operation behaviour. The fault diagnosis task consists of determination of the fault type with as many details ... Keywords: fault detection and diagnosis, residuals, symptoms, technical systems

Ioana Fagarasan; S. ST. Iliescu

2008-06-01T23:59:59.000Z

86

CRT RSA algorithm protected against fault attacks  

Science Conference Proceedings (OSTI)

Embedded devices performing RSA signatures are subject to Fault Attacks, particularly when the Chinese Remainder Theorem is used. In most cases, the modular exponentiation and the Garner recombination algorithms are targeted. To thwart Fault Attacks, ... Keywords: RSA, chinese remainder theorem, fault attacks, modular exponentiation, simple power analysis, smart card

Arnaud Boscher; Robert Naciri; Emmanuel Prouff

2007-05-01T23:59:59.000Z

87

High temperature superconducting fault current limiter  

DOE Patents (OSTI)

A fault current limiter for an electrical circuit is disclosed. The fault current limiter includes a high temperature superconductor in the electrical circuit. The high temperature superconductor is cooled below its critical temperature to maintain the superconducting electrical properties during operation as the fault current limiter. 15 figs.

Hull, J.R.

1997-02-04T23:59:59.000Z

88

Autonomic fault mitigation in embedded systems  

Science Conference Proceedings (OSTI)

Autonomy, particularly from a maintenance and fault-management perspective, is an increasingly desirable feature in embedded (and non-embedded) computer systems. The driving factors are several-including increasing pervasiveness of computer systems, ... Keywords: Autonomic computing, Embedded systems, Fault mitigation, Fault tolerance, Hierarchical concurrent finite-state machines, Model-based design

Sandeep Neema; Ted Bapty; Shweta Shetty; Steven Nordstrom

2004-10-01T23:59:59.000Z

89

Designing Fault-Tolerant Mobile Systems  

Science Conference Proceedings (OSTI)

The purpose of this paper is to investigate how several innovative techniques, not all initially intended for fault-tolerance, can be applied in providing fault tolerance of complex mobile agent systems. Due to their roaming nature, mobile agents usually ... Keywords: exception handling, fault tolerance, mobile agents, software engineering, system structuring

Giovanna Di Marzo Serugendo; Alexander B. Romanovsky

2002-11-01T23:59:59.000Z

90

The Response of Long-Span Bridges to Low Frequency, Near-Fault Earthquake Ground Motions  

SciTech Connect

Historical seismic hazard characterizations did not include earthquake ground motion waveforms at frequencies below approximately 0.2 Hz (5 seconds period). This resulted from limitations in early strong motion instrumentation and signal processing techniques, a lack of measurements in the near-field of major earthquakes and therefore no observational awareness, and a delayed understanding in the engineering community of the potential significance of these types of motions. In recent years, there is a growing recognition of the relevance of near-fault, low frequency motions, particularly for long-period structures such as large bridges. This paper describes a computationally based study of the effects of low frequency (long-period) near-fault motions on long-span bridge response. The importance of inclusion of these types of motions for long span cable supported bridges is demonstrated using actual measured broad-band, near-fault motions from large earthquakes.

McCallen, David; Astaneh-Asl, A.; Larsen, S.C.; Hutchings, Larry

2009-02-27T23:59:59.000Z

91

Hot dry rock resources of the Clear Lake Area, Northern California  

DOE Green Energy (OSTI)

The Geysers-Clear Lake geothermal area of northern California is underlain by an asthenospheric upwarp. The upwarp was generated at a slabless window trailing the northward-moving Mendocino triple junction. The geothermal area lies immediately east of the Rodgers Creek rather than the San Andreas fault because of a transform jump in progress. Decompression melting of the mantle has led to basaltic underplating, and crustal anatexis. The high heat flow is due to conduction through a thin lithosphere and the latent heat of solidifying basalt, while the uniformity is due to the distribution of sources over a wide area of large flatlying sills, The Hot Dry Rock resource has heat flow exceeding 4 HFU over an area exceeding 800 km2.

Burns, K.L.

1994-10-01T23:59:59.000Z

92

Recovery Act Project Clears Portsmouth Switchyard, Benefits Community  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Project Clears Portsmouth Switchyard, Benefits Project Clears Portsmouth Switchyard, Benefits Community through Recycling Recovery Act Project Clears Portsmouth Switchyard, Benefits Community through Recycling American Recovery and Reinvestment Act workers recently completed the demolition of structures in an electrical switchyard used to help power the Portsmouth Site's uranium enrichment processes for defense and commercial uses for nearly five decades. In the $28 million Recovery Act project completed safely and on schedule, workers demolished 160 towers as tall as 120 feet that were used to operate the X-533 Electrical Switchyard. Recovery Act Project Clears Portsmouth Switchyard, Benefits Community through Recycling More Documents & Publications Recovery Act Exceeds Major Cleanup Milestone, DOE Complex Now 74 Percent

93

Clear Skies Group Inc Holdings Inc | Open Energy Information  

Open Energy Info (EERE)

Sector Solar Product Designs and installs photovoltaic, solar thermal and co-generation power generation systems for domestic use. References Clear Skies Group Inc Holdings...

94

Microbial Fuel Cells Generate Energy While Clearing Biowaste ...  

Microbial Fuel Cells Generate Energy While Clearing Biowaste from Water Technology Summary ... from fossil fuels is both expensive and environmentally harmful.

95

Fault-ignorant Quantum Search  

E-Print Network (OSTI)

We investigate the problem of quantum searching on a noisy quantum computer. Taking a 'fault-ignorant' approach, we analyze quantum algorithms that solve the task for various different noise strengths, which are possibly unknown beforehand. We prove lower bounds on the runtime of such algorithms and thereby find that the quadratic speedup is necessarily lost (in our noise models). However, for low but constant noise levels the algorithms we provide (based on Grover's algorithm) still outperform the best noiseless classical search algorithm.

Peter Vrana; David Reeb; Daniel Reitzner; Michael M. Wolf

2013-07-02T23:59:59.000Z

96

CONTROL AND FAULT DETECTOR CIRCUIT  

DOE Patents (OSTI)

A power control and fault detectcr circuit for a radiofrequency system is described. The operation of the circuit controls the power output of a radio- frequency power supply to automatically start the flow of energizing power to the radio-frequency power supply and to gradually increase the power to a predetermined level which is below the point where destruction occurs upon the happening of a fault. If the radio-frequency power supply output fails to increase during such period, the control does not further increase the power. On the other hand, if the output of the radio-frequency power supply properly increases, then the control continues to increase the power to a maximum value. After the maximumn value of radio-frequency output has been achieved. the control is responsive to a ''fault,'' such as a short circuit in the radio-frequency system being driven, so that the flow of power is interrupted for an interval before the cycle is repeated.

Winningstad, C.N.

1958-04-01T23:59:59.000Z

97

Delay Dependent Exponential Stability for Fuzzy Recurrent Neural Networks with Interval Time-Varying Delay  

Science Conference Proceedings (OSTI)

In this paper, the problem of delay-dependent exponential stability for fuzzy recurrent neural networks with interval time-varying delay is investigated. The delay interval has been decomposed into multiple non equidistant subintervals, on these interval ... Keywords: Delay decomposition, Fuzzy recurrent neural networks, Interval time-varying delay, Maximum admissible upper bound (MAUB), Maximum exponential convergent rate (MECR)

R. Chandran; P. Balasubramaniam

2013-04-01T23:59:59.000Z

98

Internal structure of the Kern Canyon Fault, California: a deeply exhumed strike-slip fault  

E-Print Network (OSTI)

Deformation and mineral alteration adjacent to a 2 km long segment of the Kern Canyon fault near Lake Isabella, California are studied to characterize the internal structure of the fault zone and to understand the development of fault structure and constitution and the mechanical and chemical processes responsible for them. The 140 km long Kern Canyon fault (KCF) is a fault of 15 km right-lateral separation exhumed from seismogenic depth that cuts batholithic and metamorphic rocks of the southern Sierra Nevada. The fault consists of at least three distinct phases: an early phase of lower-greenschist-grade ductile shear with an S-C' phyllonite, a subsequent, dominant phase of brittle faulting characterized by a through-going zone of cataclastic rock, and a late stage of minor faulting along discontinuous, thin, hematitic gouge zones. The S-C' fabric and subsidiary fault-slip data indicate that both the phyllonitic and cataclastic zones are approximately vertical and strike-slip; slip lineations within the hematitic gouge suggest oblique-slip. The phyllonite zone trends N20-40E and accommodated ~175 m of separation. The cataclastic zone cuts the phyllonite, trends N21E, and consists of foliated and non-foliated cataclasites; it accommodates the majority of displacement along the fault. Abundant veins and fluid-assisted alteration in the rock surrounding the fault zone attest to the presence of fluids of evolving chemistry during both ductile and brittle faulting. Mass balance calculations indicate quartz loss during phyllonite faulting and imply that the fault system was open and experienced a negative change in volume during phyllonite faulting. Mesoscale and microscale fracture intensities decrease with log distance from the foliated cataclasites and approach a relatively low level at approximately 500 m. The internal structure of the Kern Canyon fault is similar to other large displacement faults in that it consists of a broad zone of fractured and altered rock and a narrow zone of intense cataclasis.

Neal, Leslie Ann

2002-01-01T23:59:59.000Z

99

Aeromagnetic Survey At Clear Lake Area (Skokan, 1993) | Open Energy  

Open Energy Info (EERE)

Clear Lake Area (Skokan, 1993) Clear Lake Area (Skokan, 1993) Exploration Activity Details Location Clear Lake Area Exploration Technique Aeromagnetic Survey Activity Date Usefulness not indicated DOE-funding Unknown Notes USGS aeromagnetic data (Rapolla and Keller, 1984) were acquired at an elevation of 4500 feet and flown with one-mile spacings. These data were dominated by patterns of highs that coincide with serpentinite outcrops. Serpentinite is one component of the complex Franciscan melange. Fracturing within the Franciscan provides the porosity needed for collection of hot water characteristic of the Geysers Field. The Clear Lake Volcanics overlie the Franciscan formation. These in turn, are overlain by the Great Valley Sequence. The susceptibilities of both the Clear Lake Volcanics and Great

100

Hardware Fault Insertion Techniques and Tools  

E-Print Network (OSTI)

The concept of dependability validation becomes more and more important regarding big public telecom systems. This is why fault insertion has been widely accepted as a means of testing the fault handling mechanisms of the systems. This master thesis classifies and compares fault insertion techniques used within the industry. It also looks into internal fault insertion techniques used by the people at Ericsson Telecom working with the AXD301 ATM switch. Hardware Fault Insertion Techniques and Tools 2 Acknowledgements The following people at Ericsson has contributed to this thesis in one way or another: Roger Nordmark Mattias Rimbark Bengt Kvist Anders strm Kenny Ohlsson Johan Jeppson Johan Eklv Also a thank you to my supervisor at KTH: Axel Jantsch A special thanks also to my good friend and colleague: Robert Thorhuus Hardware Fault Insertion Techniques and Tools 3 Abbreviations ASIC - Application Specific Integrated Circuit ATM - Asynchronous Transfer Mode BSDL - Boundary Scan De...

Emil Savqvist; Roger Nordmark; Mattias Rimbark; Bengt Kvist; Anders Ĺström; Kenny Ohlsson; Johan Eklöv; Axel Jantsch; Robert Thorhuus; Hw Hard Ware

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Apex or Salient of Normal Fault | Open Energy Information  

Open Energy Info (EERE)

Apex or Salient of Normal Fault Apex or Salient of Normal Fault Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Apex or Salient of Normal Fault Dictionary.png Apex or Salient of Normal Fault: Normal faults may intersect in the subsurface to form a fault apex or salient. Apices or salients of normal faults account for 3% of structural controls in the Great Basin. Other definitions:Wikipedia Reegle Controlling Structures List of controlling structures typically associated with geothermal systems: Major Normal Fault Termination of a Major Normal Fault Stepover or Relay Ramp in Normal Fault Zones Apex or Salient of Normal Fault Fault Intersection Accommodation Zone Displacement Transfer Zone Pull-Apart in Strike-Slip Fault Zone Intrusion Margins and Associated Fractures Stratigraphic Boundaries

102

Fault Current Management Guidebook--Updated  

Science Conference Proceedings (OSTI)

Due to increased load demands and reduced incentives to build new transmission, energy companies are increasing power flows on existing transmission assets, which will increase fault current levels throughout the power system. Also, new generation sources to be added at the transmission and distribution network will increase power flows and, consequently, fault current levels. Under increased power flow conditions on existing assets, managing fault currents is crucial for avoiding damage to equipment as ...

2006-11-28T23:59:59.000Z

103

Fault Tree Based Diagnostics Using Fuzzy Logic  

Science Conference Proceedings (OSTI)

Fuzzy set theory is investigated as a tool for the diagnostics of systems described by means of a fault tree. The objective is to diagnose component failures from the observation of fuzzy symptoms using the information contained in a fault tree. A two-step ... Keywords: causal reasoning, component failures, failure analysis, failure modes, fault tree based diagnostics, fuzzy logic, fuzzy symptoms, minimal cut-sets, triggered gates, two-step procedure

P. Gmytrasiewicz; J. A. Hassberger; J. C. Lee

1990-11-01T23:59:59.000Z

104

*Email: huang.jinan@ireq.ca OPERATION RULES DETERMINED BY RISK ANALYSIS  

E-Print Network (OSTI)

of the RPTC system. RPTC systems are installed in fifteen 735 kV substations of the Hydro-Québec system phase fault with normal clearing Single line to ground fault with delayed clearing Breaker fault element without fault Single line to ground fault with loss of two series or parallel 735 kV line Loss

Wehenkel, Louis

105

Fault diagnosis in reversible circuits under missing-gate fault model  

Science Conference Proceedings (OSTI)

This article presents a novel technique for fault detection as well as fault location in a reversible combinational circuit under the missing gate fault model. It is shown that in an (nxn) reversible circuit implemented with k-CNOT gates, addition of ...

Hafizur Rahaman; Dipak K. Kole; Debesh K. Das; Bhargab B. Bhattacharya

2011-07-01T23:59:59.000Z

106

Recovery Act Workers Clear Reactor Shields from Brookhaven Lab | Department  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Workers Clear Reactor Shields from Brookhaven Lab Workers Clear Reactor Shields from Brookhaven Lab Recovery Act Workers Clear Reactor Shields from Brookhaven Lab American Recovery and Reinvestment Act workers are in the final stage of decommissioning a nuclear reactor after they recently removed thick steel shields once used to absorb neutrons produced for research. The Brookhaven National Laboratory is using $39 million from the Recovery Act to decommission the Brookhaven Graphite Research Reactor, the world's first reactor built solely for peaceful research purposes. Recovery Act Workers Clear Reactor Shields from Brookhaven Lab More Documents & Publications Brookhaven Graphite Research Reactor Workshop 2011 ARRA Newsletters Idaho Crews Overcome Challenges to Safely Dispose 1-Million-Pound Hot Cell

107

Recovery Act Project Clears Portsmouth Switchyard, Benefits Community  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Recovery Act Project Clears Portsmouth Switchyard, Benefits Recovery Act Project Clears Portsmouth Switchyard, Benefits Community through Recycling Recovery Act Project Clears Portsmouth Switchyard, Benefits Community through Recycling American Recovery and Reinvestment Act workers recently completed the demolition of structures in an electrical switchyard used to help power the Portsmouth Site's uranium enrichment processes for defense and commercial uses for nearly five decades. In the $28 million Recovery Act project completed safely and on schedule, workers demolished 160 towers as tall as 120 feet that were used to operate the X-533 Electrical Switchyard. Recovery Act Project Clears Portsmouth Switchyard, Benefits Community through Recycling More Documents & Publications Microsoft Word - PSRP Updates 6-25-10_v2

108

Empirical Estimation of Daily Clear Sky Solar Radiation  

Science Conference Proceedings (OSTI)

The suitability of two simple empirical equations for the estimation of clear sky radiation was investigated. Results indicated that latitude and altitude were sufficient to estimate the empirical equation coefficients and that the estimates of ...

D. F. Heermann; G. J. Harrington; K. M. Stahl

1985-03-01T23:59:59.000Z

109

Clear-Sky Nocturnal Temperatures Forecast and the Greenhouse Effect  

Science Conference Proceedings (OSTI)

Nocturnal evolution of air and soil temperatures are computed for clear-sky situations. The model takes into account the soil heat conduction and the atmospheric radiative transfers by using radiosonde data for temperature, water vapor, and ...

A. Quinft; J. Vanderborght

1996-03-01T23:59:59.000Z

110

Microsoft Word - INL Waste Stream Cleared for Shipment to WIPP...  

NLE Websites -- All DOE Office Websites (Extended Search)

Idaho National Laboratory Waste Stream Cleared For Shipment to WIPP CARLSBAD, N.M., December 12, 2006 - The U.S. Department of Energy (DOE) has authorized the Idaho National...

111

NREL: Wind Research - Milestone Cleared for Offshore Wind Energy...  

NLE Websites -- All DOE Office Websites (Extended Search)

Milestone Cleared for Offshore Wind Energy Research Lease in Virginia March 25, 2013 The U.S. Department of the Interior's Bureau of Ocean Energy Management announced an important...

112

Clearing up some concerns about cloud computing and genomics...  

NLE Websites -- All DOE Office Websites (Extended Search)

Clearing up some concerns about cloud computing and genomics research October 7, 2013 Tweet EmailPrint Cloud computing has become a popular option for scientists wanting on-demand...

113

Factors Controlling ERBE Longwave Clear Sky and Cloud Forcing Fluxes  

Science Conference Proceedings (OSTI)

The factors controlling the Earth Radiation Budget satellite (ERBS) longwave clear sky and cloud-forcing fluxes are investigated using statistical analyses of the ERBS fluxes with International Satellite Cloud Climatology Project (ISCCP) cloud ...

Bryan C. Weare

1995-07-01T23:59:59.000Z

114

Numerical Simulation of Cloud–Clear Air Interfacial Mixing  

Science Conference Proceedings (OSTI)

This paper discusses results from a series of direct numerical simulations of the microscale cloud–clear air mixing, set forth in the idealized scenario of decaying moist turbulence. In the moist case, kinetic energy of microscale motions comes ...

Miros?aw Andrejczuk; Wojciech W. Grabowski; Szymon P. Malinowski; Piotr K. Smolarkiewicz

2004-07-01T23:59:59.000Z

115

Geophysical study of the Clear Lake region, California  

DOE Green Energy (OSTI)

Results of geophysical studies in the Clear Lake region of California, north of San Francisco, have revealed a prominent, nearly circular negative gravity anomaly with an amplitude of more than 25 milligals (mgal) and an areal extent of approximately 250 square miles and, in addition, a number of smaller positive and negative anomalies. The major negative gravity anomaly is closely associated with the Clear Lake volcanic field and with an area characterized by hot springs and geothermal fields. However, the anomaly cannot be explained by mapped surface geologic features of the area. Aeromagnetic data in the Clear Lake region show no apparent correlation with the major negative gravity anomaly; the local magnetic field is affected principally by serpentine. An electrical resistivity low marks the central part of the gravity minimum, and a concentration of earthquake epicenters characterizes the Clear Lake volcanic field area. The primary cause of the major negative gravity anomaly is believed to be a hot intrusive mass, possibly a magma chamber, that may underlie the Clear Lake volcanic field and vicinity. This mass may serve as a source of heat for the geothermal phenomena in the area. Other smaller gravity anomalies in the Clear Lake region are apparently caused by near-surface geologic features, including relatively dense units of the Franciscan Formation and less dense Cenozoic sedimentary and volcanic rock units.

Chapman, R.H.

1975-01-01T23:59:59.000Z

116

Global horizontal irradiance clear sky models : implementation and analysis.  

SciTech Connect

Clear sky models estimate the terrestrial solar radiation under a cloudless sky as a function of the solar elevation angle, site altitude, aerosol concentration, water vapor, and various atmospheric conditions. This report provides an overview of a number of global horizontal irradiance (GHI) clear sky models from very simple to complex. Validation of clear-sky models requires comparison of model results to measured irradiance during clear-sky periods. To facilitate validation, we present a new algorithm for automatically identifying clear-sky periods in a time series of GHI measurements. We evaluate the performance of selected clear-sky models using measured data from 30 different sites, totaling about 300 site-years of data. We analyze the variation of these errors across time and location. In terms of error averaged over all locations and times, we found that complex models that correctly account for all the atmospheric parameters are slightly more accurate than other models, but, primarily at low elevations, comparable accuracy can be obtained from some simpler models. However, simpler models often exhibit errors that vary with time of day and season, whereas the errors for complex models vary less over time.

Stein, Joshua S.; Hansen, Clifford W.; Reno, Matthew J.

2012-03-01T23:59:59.000Z

117

2. Annual Quantities of Land Clearing Debris Generated and Used (1) Sectors that generate Land Clearing Debris:  

E-Print Network (OSTI)

Land clearing debris is defined as growing stock and other timber sources cut or otherwise destroyed in the process of converting forest land to non-forest uses. 1 Growing stock that is removed in silvicultural operations such as pre-commercial thinning is also included in this definition. Land clearing debris is typically in the form of tree tops and branches, trees cut or knocked down and left on site, and stumps. In non-forested areas, such as grasslands and desert, land clearing debris may include soil, rocks, and shrubs, although fuel is primarily derived from previously forested areas.

unknown authors

2010-01-01T23:59:59.000Z

118

Delay-Insensitivity and Semi-Modularity  

Science Conference Proceedings (OSTI)

The study of asynchronous circuit behaviors in the presence of component and wire delays has received a great deal of attention. In this paper, we consider asynchronous circuits whose components can be any non-deterministic sequential machines of ... Keywords: asynchronous, bisimulation, delay-dense, delay-insensitive, isochronic, module, network, semi-modular, speedindependent

J. A. Brzozowski; H. Zhang

2000-03-01T23:59:59.000Z

119

Distribution Fault Location Support Tools, Algorithms, and Implementation Approaches  

Science Conference Proceedings (OSTI)

Distribution grid modernization applications such as fault location and automatic sectionalizing require an accurate assessment of fault current. More-accurate prediction of fault locations will shorten the fault investigation (patrol) time, which in turn can reduce the total restoration time and duration of the outage experienced by the customer. This EPRI technical update report presents information on fault location applications, enumerates different methods used to detect the location of faults, ...

2013-08-14T23:59:59.000Z

120

Scattering and; Delay, Scale, and Sum Migration  

SciTech Connect

How do we see? What is the mechanism? Consider standing in an open field on a clear sunny day. In the field are a yellow dog and a blue ball. From a wave-based remote sensing point of view the sun is a source of radiation. It is a broadband electromagnetic source which, for the purposes of this introduction, only the visible spectrum is considered (approximately 390 to 750 nanometers or 400 to 769 TeraHertz). The source emits an incident field into the known background environment which, for this example, is free space. The incident field propagates until it strikes an object or target, either the yellow dog or the blue ball. The interaction of the incident field with an object results in a scattered field. The scattered field arises from a mis-match between the background refractive index, considered to be unity, and the scattering object refractive index ('yellow' for the case of the dog, and 'blue' for the ball). This is also known as an impedance mis-match. The scattering objects are referred to as secondary sources of radiation, that radiation being the scattered field which propagates until it is measured by the two receivers known as 'eyes'. The eyes focus the measured scattered field to form images which are processed by the 'wetware' of the brain for detection, identification, and localization. When time series representations of the measured scattered field are available, the image forming focusing process can be mathematically modeled by delayed, scaled, and summed migration. This concept of optical propagation, scattering, and focusing have one-to-one equivalents in the acoustic realm. This document is intended to present the basic concepts of scalar scattering and migration used in wide band wave-based remote sensing and imaging. The terms beamforming and (delayed, scaled, and summed) migration are used interchangeably but are to be distinguished from the narrow band (frequency domain) beamforming to determine the direction of arrival of a signal, and seismic migration in which wide band time series are shifted but not to form images per se. Section 3 presents a mostly graphically-based motivation and summary of delay, scale, and sum beamforming. The model for incident field propagation in free space is derived in Section 4 under specific assumptions. General object scattering is derived in Section 5 and simplified under the Born approximation in Section 6. The model of this section serves as the basis in the derivation of time-domain migration. The Foldy-Lax, full point scatterer scattering, method is derived in Section 7. With the previous forward models in hand, delay, scale, and sum beamforming is derived in Section 8. Finally, proof-of-principle experiments are present in Section 9.

Lehman, S K

2011-07-06T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

ARMor: fully verified software fault isolation  

Science Conference Proceedings (OSTI)

We have designed and implemented ARMor, a system that uses software fault isolation (SFI) to sandbox application code running on small embedded processors. Sandboxing can be used to protect components such as the RTOS and critical control loops from ... Keywords: arm executables, automated theorem proving, program logic, software fault isolation

Lu Zhao; Guodong Li; Bjorn De Sutter; John Regehr

2011-10-01T23:59:59.000Z

122

A switch level fault simulation environment  

Science Conference Proceedings (OSTI)

This paper presents a fault simulation environment which accepts pure switch level or mixed switch/RT level descriptions of the design under test. Switch level fault injection strategies for the stuck-at, transition and logic bridge models are presented. ...

V. Krishnaswamy; J. Casas; T. Tetzlaff

2000-06-01T23:59:59.000Z

123

Numeric simulation of faults in electrical networks  

Science Conference Proceedings (OSTI)

In the paper is presented a virtual simulator for three-phased medium voltage electric circuits. The simulator allows analyzing transient regimes caused by the faults produced in electric distribution networks (simple grounding, double grounding, broken ... Keywords: faults in electric network, numerical simulation, three phased circuits, transient regimes

Toader Dumitru; Haragus Stefan; Blaj Constantin

2009-03-01T23:59:59.000Z

124

Gas Turbine Fault Diagnosis using Random Forests  

Science Conference Proceedings (OSTI)

In the present paper, Random Forests are used in a critical and at the same time non trivial problem concerning the diagnosis of Gas Turbine blading faults, portraying promising results. Random forests-based fault diagnosis is treated as a Pattern Recognition ...

Manolis Maragoudakis; Euripides Loukis; Panayotis-Prodromos Pantelides

2008-06-01T23:59:59.000Z

125

BASE: Using abstraction to improve fault tolerance  

Science Conference Proceedings (OSTI)

Software errors are a major cause of outages and they are increasingly exploited in malicious attacks. Byzantine fault tolerance allows replicated systems to mask some software errors but it is expensive to deploy. This paper describes a replication ... Keywords: Byzantine fault tolerance, N-version programming, asynchronous systems, proactive recovery, state machine replication

Miguel Castro; Rodrigo Rodrigues; Barbara Liskov

2003-08-01T23:59:59.000Z

126

Representing parameterised fault trees using Bayesian networks  

Science Conference Proceedings (OSTI)

Fault trees are used to model how failures lead to hazards and so to estimate the frequencies of the identified hazards of a system. Large systems, such as a rail network, do not give rise to endless different hazards. Rather, similar hazards arise repeatedly ... Keywords: Bayesian network, fault tree, risk analysis

William Marsh; George Bearfield

2007-09-01T23:59:59.000Z

127

INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS  

E-Print Network (OSTI)

INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS by Aderiano M. da Silva, B.S. A Thesis;i Abstract Induction motors are used worldwide as the "workhorse" in industrial applications material. However, induction motor faults can be detected in an initial stage in order to prevent

Povinelli, Richard J.

128

fault diagnosis of a high voltage transmission line using waveform ...  

E-Print Network (OSTI)

Oct 4, 2013 ... FAULT DIAGNOSIS OF A HIGH VOLTAGE TRANSMISSION LINE USING ... Fault types such as single line to ground, line to line, double line to ...

129

Modeling and Measurement Constraints in Fault Diagnostics for HVAC Systems  

E-Print Network (OSTI)

in Fault Diagnostics for HVAC Systems Massieh Najafi 1 ,tools for determining HVAC diagnostics, methods todetect faults in HVAC systems are still generally

Najafi, Massieh

2010-01-01T23:59:59.000Z

130

Modeling and simulation of HVAC faults in EnergyPlus  

NLE Websites -- All DOE Office Websites (Extended Search)

simulation of HVAC faults in EnergyPlus Title Modeling and simulation of HVAC faults in EnergyPlus Publication Type Conference Paper Refereed Designation Refereed Year of...

131

Modeling and Measurement Constraints in Fault Diagnostics for...  

NLE Websites -- All DOE Office Websites (Extended Search)

Modeling and Measurement Constraints in Fault Diagnostics for HVAC Systems Title Modeling and Measurement Constraints in Fault Diagnostics for HVAC Systems Publication Type Journal...

132

CIFTS: Coordinated Infrastructure for Fault-Tolerant Systems...  

NLE Websites -- All DOE Office Websites (Extended Search)

CIFTS: Coordinated Infrastructure for Fault-Tolerant Systems CIFTS: Coordinated Infrastructure for Fault-Tolerant Systems Current systems software components for large-scale...

133

CIFTS: A Coordinated Infrastructure for Fault-Tolerant Systems...  

NLE Websites -- All DOE Office Websites (Extended Search)

CIFTS: A Coordinated Infrastructure for Fault-Tolerant Systems Title CIFTS: A Coordinated Infrastructure for Fault-Tolerant Systems Publication Type Conference Paper Year of...

134

Detect and classify faults using neural nets  

SciTech Connect

The analysis of transmission line faults is essential to the proper performance of the power system. It is required if protective relays are to take the appropriate action and in monitoring the performance of relays, circuit breakers, and other protective and control elements. The detection and classification of transmission line faults is a fundamental component of such fault analysis. Another application of fault analysis is in software packages for automated analysis of digital fault recorder (DFR) files. Recently, such a package, called DFR Assistant, was developed for substation applications. This program can be installed locally in a substation, in which case it is connected directly to the DFR via a high speed parallel link, or it can be installed at a central station, in which case it can be configured to automatically analyze events coming from all DFRs.

Kezunovic, M.; Rikalo, I.

1996-10-01T23:59:59.000Z

135

Automated Fault Location In Smart Distribution Systems  

E-Print Network (OSTI)

Fault location in distribution systems is a critical component of outage management and service restoration, which directly impacts feeder reliability and quality of the electricity supply. Improving fault location methods supports the Department of Energy (DOE) “Grid 2030” initiatives for grid modernization by improving reliability indices of the network. Improving customer average interruption duration index (CAIDI) and system average interruption duration index (SAIDI) are direct advantages of utilizing a suitable fault location method. As distribution systems are gradually evolving into smart distribution systems, application of more accurate fault location methods based on gathered data from various Intelligent Electronic Devices (IEDs) installed along the feeders is quite feasible. How this may be done and what is the needed methodology to come to such solution is raised and then systematically answered. To reach this goal, the following tasks are carried out: 1) Existing fault location methods in distribution systems are surveyed and their strength and caveats are studied. 2) Characteristics of IEDs in distribution systems are studied and their impacts on fault location method selection and implementation are detailed. 3) A systematic approach for selecting optimal fault location method is proposed and implemented to pinpoint the most promising algorithms for a given set of application requirements. 4) An enhanced fault location method based on voltage sag data gathered from IEDs along the feeder is developed. The method solves the problem of multiple fault location estimations and produces more robust results. 5) An optimal IED placement approach for the enhanced fault location method is developed and practical considerations for its implementation are detailed.

Lotfifard, Saeed

2011-08-01T23:59:59.000Z

136

A Crystal-Clear Solution | Y-12 National Security Complex  

NLE Websites -- All DOE Office Websites (Extended Search)

A Crystal-Clear Solution A Crystal-Clear Solution A Crystal-Clear Solution Posted: July 22, 2013 - 3:27pm | Y-12 Report | Volume 10, Issue 1 | 2013 When he's not analyzing uranium, Ashley Stowe is finding new ways to detect it. His project to grow lithium semiconductor crystals suitable for radiation detection is the first step in solving a global shortage of helium-3, the most common element used in current detectors. In 2008, the U.S. government announced a critical shortage of helium-3, a material decidedly more important to national security than the helium-4 used to inflate party balloons. The helium-3 isotope is the most common element used in the radiation detectors that monitor U.S. ports and borders for the possible trafficking of nuclear materials. Because the world's helium-3 supply is diminishing and demand is

137

Clear Communication Skills for Managers and Supervisors | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Clear Communication Skills for Managers and Supervisors Clear Communication Skills for Managers and Supervisors Clear Communication Skills for Managers and Supervisors February 26, 2014 8:30AM EST to February 27, 2014 4:00PM EST Registration Procedure: Please use the Corporate Human Resource Information System (CHRIS) Workflow process to request training enrollment. Course Code: 002441 Session Number: 0001. Cost: $400. For organizations not currently using the CHRIS workflow process, please follow your existing interoffice training registration process. The Office of Learning and Workforce Development (HC-20) will assess the course cost for this training session directly through each Headquarters organization's Working Capital Fund account. Field office participants should register via CHRIS. They should ensure to note the cost of the

138

ClearFuels Technology Inc | Open Energy Information  

Open Energy Info (EERE)

ClearFuels Technology Inc ClearFuels Technology Inc Jump to: navigation, search Name ClearFuels Technology Inc Place Aiea, Hawaii Zip 96701 Sector Biofuels Product Hawaii-based biofuels processing firm. Coordinates 21.379701°, -157.930896° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":21.379701,"lon":-157.930896,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

139

Fault diagnosis using substation computer  

SciTech Connect

A number of substation integrated control and protection systems (ICPS) are being developed around the world, where the protective relaying, control, and monitoring functions of a substation are implemented using microprocessors. In this design, conventional relays and control devices are replaced by clusters of microprocessors, interconnected by multiplexed digital communication channels using fibre optic, twisted wire pairs or coaxial cables. The ICPS incorporates enhanced functions of value to the utility and leads to further advancement of the automation of transmission substations. This paper presents an automated method of fault diagnosis which can be incorporated in the station computer of an integrated control and protection system. The effectiveness of this method is demonstrated using a transmission-level substation as an example.

Jeyasurya, B. (Indian Inst. of Tech., Bombay (India)); Venkata, S.S. (Washington Univ., Seattle, WA (USA). Dept. of Electrical Engineering); Vadari, S.V. (ESCA Corp., Bellevue, WA (USA)); Postforoosh, J. (T and D. Protection Group, Puget Sound Power and Light, Bellevue, WA (US))

1990-04-01T23:59:59.000Z

140

An arc fault detection system  

DOE Patents (OSTI)

An arc fault detection system for use on ungrounded or high-resistance-grounded power distribution systems is provided which can be retrofitted outside electrical switchboard circuits having limited space constraints. The system includes a differential current relay that senses a current differential between current flowing from secondary windings located in a current transformer coupled to a power supply side of a switchboard, and a total current induced in secondary windings coupled to a load side of the switchboard. When such a current differential is experienced, a current travels through a operating coil of the differential current relay, which in turn, opens an upstream circuit breaker located between the switchboard and a power supply to remove the supply of power to the switchboard.

Jha, Kamal N.

1997-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Optimal integer delay budgeting on directed acyclic graphs  

Science Conference Proceedings (OSTI)

Delay budget is an excess delay each component of a design can tolerate under a given timing constraint. Delay budgeting has been widely exploited to improve the design quality. We present an optimal integer delay budgeting algorithm. Due to numerical ...

E. Bozorgzadeh; S. Ghiasi; A. Takahashi; M. Sarrafzadeh

2003-06-01T23:59:59.000Z

142

Saturating time-delay transformer for overcurrent protection  

DOE Patents (OSTI)

Electrical loads connected to d-c supplies are protected from damage by overcurrent in the case of a load fault by connecting in series with the load a saturating transformer that detects a load fault and limits the fault current to a safe level for a period long enough to correct the fault or else disconnect the power supply.

Praeg, Walter F. (Palos Park, IL)

1977-01-01T23:59:59.000Z

143

Saturating time-delay transformer for overcurrent protection. [Patent application  

DOE Patents (OSTI)

Electrical loads connected to dc supplies are protected from damage by overcurrent in the case of a load fault by connecting in series with the load a saturating transformer that detects a load fault and limits the fault current to a safe level for a period long enough to correct the fault or else disconnect the power supply.

Praeg, W.F.

1975-12-18T23:59:59.000Z

144

Cooperative application/OS DRAM fault recovery.  

Science Conference Proceedings (OSTI)

Exascale systems will present considerable fault-tolerance challenges to applications and system software. These systems are expected to suffer several hard and soft errors per day. Unfortunately, many fault-tolerance methods in use, such as rollback recovery, are unsuitable for many expected errors, for example DRAM failures. As a result, applications will need to address these resilience challenges to more effectively utilize future systems. In this paper, we describe work on a cross-layer application/OS framework to handle uncorrected memory errors. We illustrate the use of this framework through its integration with a new fault-tolerant iterative solver within the Trilinos library, and present initial convergence results.

Ferreira, Kurt Brian; Bridges, Patrick G. (University of New Mexico, Albuquerque, NM); Heroux, Michael Allen; Hoemmen, Mark; Brightwell, Ronald Brian

2012-05-01T23:59:59.000Z

145

Mechanical Models of Fault-Related Folding  

SciTech Connect

The subject of the proposed research is fault-related folding and ground deformation. The results are relevant to oil-producing structures throughout the world, to understanding of damage that has been observed along and near earthquake ruptures, and to earthquake-producing structures in California and other tectonically-active areas. The objectives of the proposed research were to provide both a unified, mechanical infrastructure for studies of fault-related foldings and to present the results in computer programs that have graphical users interfaces (GUIs) so that structural geologists and geophysicists can model a wide variety of fault-related folds (FaRFs).

Johnson, A. M.

2003-01-09T23:59:59.000Z

146

Variable-delay feedback control of unstable steady states in retarded time-delayed systems  

E-Print Network (OSTI)

We study the stability of unstable steady states in scalar retarded time-delayed systems subjected to a variable-delay feedback control. The important aspect of such a control problem is that time-delayed systems are already infinite-dimensional before the delayed feedback control is turned on. When the frequency of the modulation is large compared to the system's dynamics, the analytic approach consists of relating the stability properties of the resulting variable-delay system with those of an analogous distributed delay system. Otherwise, the stability domains are obtained by a numerical integration of the linearized variable-delay system. The analysis shows that the control domains are significantly larger than those in the usual time-delayed feedback control, and that the complexity of the domain structure depends on the form and the frequency of the delay modulation.

Aleksandar Gjurchinovski; Viktor Urumov

2010-07-06T23:59:59.000Z

147

Neural Fault Diagnosis and Fuzzy Fault Control for a Complex Dynamic System  

E-Print Network (OSTI)

Fault diagnosis has become an issue of primary importance in modern process automation as it provides the prerequisites for the task of fault detection. The ability to detect the faults is essential to improve reliability and security of a complex control system. Parameter estimation methods, state observation schemes, statistical likelihood ratio tests, rule-based expert system reasoning, pattern recognition techniques, and artificial neural network approaches are the most common methodologies developed actively during recent years. In this paper, we describe a completed feasibility study demonstrating the merit of employing pattern recognition and an artificial neural network for fault diagnosis through back propagation learning algorithm and making the use of fuzzy approximate reasoning for fault control via parameter changes in a dynamic system. As a test case, a complex magnetic levitation vehicle (MLV) system is studied. Analytical fault symptoms are obtained by system dynamics m...

Ching-yu Tyan; Paul P. Wang; Dennis R. Bahler

1995-01-01T23:59:59.000Z

148

Quantification of Priority-OR gates in temporal fault trees  

Science Conference Proceedings (OSTI)

Fault Tree Analysis has been used in reliability engineering for many decades and has seen various modifications to enable it to analyse fault trees with dynamic and temporal gates so it can incorporate sequential failure in its analysis. Pandora is ... Keywords: Markov chains, Monte Carlo, Pandora, dynamic fault trees, fault trees, safety

Ernest Edifor; Martin Walker; Neil Gordon

2012-09-01T23:59:59.000Z

149

A transmission line fault locator based on Elman recurrent networks  

Science Conference Proceedings (OSTI)

In this paper, a transmission line fault location model which is based on an Elman recurrent network (ERN) has been presented for balanced and unbalanced short circuit faults. All fault situations with different inception times are implemented on a 380-kV ... Keywords: Elman networks, Fault location, Transmission lines, Wavelet transform

Sami Ekici; Selcuk Yildirim; Mustafa Poyraz

2009-01-01T23:59:59.000Z

150

Development of Hydrologic Characterization Technology of Fault Zones  

E-Print Network (OSTI)

pathways in the Monterey Formation, California: Americanalong faults in the Monterey Formation, coastal California.

Karasaki, Kenzi

2009-01-01T23:59:59.000Z

151

Online fault detection and tolerance for photovoltaic energy harvesting systems  

Science Conference Proceedings (OSTI)

Photovoltaic energy harvesting systems (PV systems) are subject to PV cell faults, which decrease the efficiency of PV systems and even shorten the PV system lifespan. Manual PV cell fault detection and elimination are expensive and nearly impossible ... Keywords: fault detection, fault tolerance, photovoltaic panel reconfiguration, photovoltaic system

Xue Lin; Yanzhi Wang; Di Zhu; Naehyuck Chang; Massoud Pedram

2012-11-01T23:59:59.000Z

152

Fault intersections and hybrid transform faults in the southern Salton Trough geothermal area, Baja California, Mexico  

DOE Green Energy (OSTI)

Analysis of 55 wells drilled at the Cerro Prieto Geothermal Field and a suite of geological and geophysical studies throughout the southern Salton Trough from the Mexican-United States border to the Gulf of California clarify two concepts important to geothermal development: (1) increased natural convective fluid flow and better permeability should occur at intersecting faults both regionally and within a producing field, and (2) the Cerro Prieto and Imperial faults are best conceived of as hybrid types having features of both San Andreas style wrench faults and oceanic tranform faults.

Vonder Haar, S.; Puente Cruz, I.

1979-07-01T23:59:59.000Z

153

Fault Detection, Location, Isolation and Reconnection in ...  

A University of Colorado research team led by Jae-Do Park has developed a fault detection, location and isolation scheme for a low-voltage DC-bus microgrid system, ...

154

Fault tolerance for holonomic quantum computation  

E-Print Network (OSTI)

We review an approach to fault-tolerant holonomic quantum computation on stabilizer codes. We explain its workings as based on adiabatic dragging of the subsystem containing the logical information around suitable loops along which the information remains protected.

Ognyan Oreshkov; Todd A. Brun; Daniel A. Lidar

2013-12-01T23:59:59.000Z

155

Recovery Act Project Clears Portsmouth Switchyard, Benefits Community through Recycling  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Project Clears Portsmouth Project Clears Portsmouth Switchyard, Benefits Community through Recycling PIKETON, Ohio - American Recovery and Reinvestment Act workers recently completed the demolition of structures in an electrical switchyard used to help power the Portsmouth Site's uranium enrichment processes for defense and commercial uses for nearly five decades. In the $28 million Recovery Act project completed safely and on schedule, workers demolished 160 towers as tall as 120 feet that were used to operate the X-533 Electrical Switchyard. The 20-acre complex was one of two high-voltage switchyards that together provided up to 2,200 megawatts of power - enough to light up New York City at the time the Portsmouth Gaseous Diffu- sion Plant was constructed in the 1950s. The remaining switch-

156

Clear Creek County, Colorado: Energy Resources | Open Energy Information  

Open Energy Info (EERE)

Clear Creek County, Colorado: Energy Resources Clear Creek County, Colorado: Energy Resources Jump to: navigation, search Equivalent URI DBpedia Coordinates 39.6904464°, -105.6412527° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":39.6904464,"lon":-105.6412527,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

157

How to treat and recycle heavy clear brine fluids  

Science Conference Proceedings (OSTI)

Clear brine fluids, such as CaCl/sub 2/, are replacing muds in well completions and workovers. These ''solids-free'' fluids have caused increases in well productivity of as much as 850%. To use the fluids in higher density ranges, it is necessary to blend the CaCl/sub 2/ brines with the more expensive bromide fluids. This, in turn, has increased the importance of reclaiming weighted brines to make their use more cost effective. To reclaim clear fluids, the solids picked up during use are removed and the fluid is reused or reweighted. A common problem though is the post-precipitation of dissolved contaminants that may appear in the used brines after several days or weeks in storage. Precipitation also may occur if other heavy fluids are added to adjust density before reuse. Laboratory tests have identified the solids as primarily iron hydroxides and halides. (Halides are salts containing a halogen-flourine, chlorine, bromine, or iodine.) Additional experimentation has shown that pH adjustment at the well site or before transfer to storage facilities can provide a simple and effective way of controlling the precipitation of metal hydroxides and halides. This article discusses methods of pH control, measurement, and adjustment, which will allow for optimum use of clear brine fluids.

Pasztor, A.J.; Snover, J.S.

1983-07-01T23:59:59.000Z

158

Time dependent estimates of delays and delay costs at major airports  

E-Print Network (OSTI)

Two queuing models appropriate for estimating time dependent delays and delay costs at major airports are reviewed. The models use the demand and capacity profiles at any given airport as well as the number of runways there ...

Hengsbach, Gerd

1975-01-01T23:59:59.000Z

159

Analysis on delay-dependent stability for neural networks with time-varying delays  

Science Conference Proceedings (OSTI)

This paper considers the problem of delay-dependent stability criteria for neural networks with time-varying delays. First, by constructing a newly augmented Lyapunov-Krasovskii functional, a less conservative stability criterion is established in terms ... Keywords: Lyapunov method, Neural networks, Stability, Time-varying delays

O. M. Kwon; Ju H. Park; S. M. Lee; E. J. Cha

2013-03-01T23:59:59.000Z

160

TCP with delayed ack for wireless networks  

Science Conference Proceedings (OSTI)

This paper studies the TCP performance with delayed ack in wireless networks (including ad hoc and WLANs) which use IEEE 802.11 MAC protocol as the underlying medium access control. Our analysis and simulations show that TCP throughput does not always ... Keywords: Adaptive delayed ack, Congestion control, Friendliness, TCP, Wireless medium access/contention

Jiwei Chen; Mario Gerla; Yeng Zhong Lee; M. Y. Sanadidi

2008-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Measuring and Modeling Fault Density for Plume-Fault Encounter Probability Estimation  

Science Conference Proceedings (OSTI)

Emission of carbon dioxide from fossil-fueled power generation stations contributes to global climate change. Storage of this carbon dioxide within the pores of geologic strata (geologic carbon storage) is one approach to mitigating the climate change that would otherwise occur. The large storage volume needed for this mitigation requires injection into brine-filled pore space in reservoir strata overlain by cap rocks. One of the main concerns of storage in such rocks is leakage via faults. In the early stages of site selection, site-specific fault coverages are often not available. This necessitates a method for using available fault data to develop an estimate of the likelihood of injected carbon dioxide encountering and migrating up a fault, primarily due to buoyancy. Fault population statistics provide one of the main inputs to calculate the encounter probability. Previous fault population statistics work is shown to be applicable to areal fault density statistics. This result is applied to a case study in the southern portion of the San Joaquin Basin with the result that the probability of a carbon dioxide plume from a previously planned injection had a 3% chance of encountering a fully seal offsetting fault.

Jordan, P.D.; Oldenburg, C.M.; Nicot, J.-P.

2011-05-15T23:59:59.000Z

162

A fault location approach for fuzzy fault section estimation on radial distribution feeders  

E-Print Network (OSTI)

Locating the faulted section of a distribution system is a difficult task because of lack of accurate system models and the presence of uncertainty in the data used for estimating the fault section. Many of the methods used to account for the uncertainty use fuzzy logic techniques to estimate bounds of possibility of the input data and calculated quantities, or probabilistic modeling of the input data to estimate the likelihood of the location of the fault on a particular section of the feeder. Heuristic knowledge of control center dispatchers has also been used for uncertainty management. This thesis presents the design and implementation of a phase selector algorithm and a fault distance algorithm for use in an automated modular scheme for fault section estimation on radial distribution systems. These two algorithms will be executed in combination with two other fault location algorithms. The scheme is executed using the data record of an abnormal event in a three-stage scheme. The phase selector algorithm was used to obtain event-phase possibility values representing the possibility of involvement of each of the phases and the neutral in an event. A section-event possibility value that indicated the possibility that a section of the feeder was involved in the fault was evaluated using the event-phase possibility values and line section phase topology information. The fault distance algorithm was used to eliminate sections of the feeder that were not likely to be possible faulted section candidates by assuming a bolted fault and estimating its location. Each line section was assigned a fault possibility value of zero or one according to its location relative to the location of the fault. The phase selector algorithm was tested using real data measured at feeder substations and the fault distance algorithm was tested using data obtained by staging faults on a model of an overhead feeder using EMTP/ATP simulation. The results obtained from the tests were promising. A simple illustration of the combination of the results of the two algorithms is given. The result of this combination shows the potential of the simultaneous use of the two algorithms.

Andoh, Kwame Sarpong

2000-01-01T23:59:59.000Z

163

Fast Fault Recovery in Switched Networks for Carrying IP Telephony Traffic.  

E-Print Network (OSTI)

?? One of the most parts of VOIP management is fault management and, in having a good fault management, finding good mechanisms to detect faults… (more)

Eisazadeh, Ali Akbar

2010-01-01T23:59:59.000Z

164

Hot Dry Rock resources of the Clear Lake area, California  

DOE Green Energy (OSTI)

The Hot Dry Rock resources of the Clear Lake area of northern California are hot, large and areally uniform. The geological situation is special, probably overlying a slabless window caused by interaction between tectonic plates. Consequent magmatic processes have created a high-grade resource, in which the 300{degree}C isotherm is continuous, subhorizontal, and available at the shallow depth of 2.4 to 4.7 km over an area of 800 km{sup 2}. The region is very favorable for HDR development.

Burns, K.L.; Potter, R.M. [Los Alamos National Lab., NM (United States); Peake, R.A. [California Energy Commission, CA (United States)

1995-01-01T23:59:59.000Z

165

Stress and fault rock controls on fault zone hydrology, Coso geothermal  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Stress and fault rock controls on fault zone hydrology, Coso geothermal field, CA Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Stress and fault rock controls on fault zone hydrology, Coso geothermal field, CA Details Activities (1) Areas (1) Regions (0) Abstract: In crystalline rock of the Coso Geothermal Field, CA, fractures are the primary source of permeability. At reservoir depths, borehole image, temperature, and mud logs indicate fluid flow is concentrated in extensively fractured damage zones of large faults well-oriented for slip.

166

Novel delay-dependent asymptotic stability criteria for neural networks with time-varying delays  

Science Conference Proceedings (OSTI)

The problem of delay-dependent asymptotic stability criteria for neural networks (NNs) with time-varying delays is investigated. An improved linear matrix inequality based on delay-dependent stability test is introduced to ensure a large upper bound ... Keywords: 34K20, 34K25, 37C20, 37C25, 37C75, 37N35, 37N40, 93C10, 93C83, 93D05, 93D20, Delay-dependent, Linear matrix inequality (LMI), Neural networks (NNs), Time-varying delay

Junkang Tian; Dongsheng Xu; Jian Zu

2009-06-01T23:59:59.000Z

167

Thermal modeling of the Clear Lake magmatic system, California: Implications for conventional and hot dry rock geothermal development  

Science Conference Proceedings (OSTI)

The combination of recent volcanism, high heat flow ({ge} HFU or 167 mW/m{sup 2}), and high conductive geothermal gradient (up to 120{degree} C/km) makes the Clear Lake region of northern California one of the best prospects for hot dry rock (HDR) geothermal development in the US. The lack of permeability in exploration wells and lack of evidence for widespread geothermal reservoirs north of the Collayomi fault zone are not reassuring indications for conventional geothermal development. This report summarizes results of thermal modeling of the Clear Lake magmatic system, and discusses implications for HDR site selection in the region. The thermal models incorporate a wide range of constraints including the distribution and nature of volcanism in time and space, water and gas geochemistry, well data, and geophysical surveys. The nature of upper crustal magma bodies at Clear Lake is inferred from studying sequences of related silicic lavas, which tell a story of multistage mixing of silicic and mafic magma in clusters of small upper crustal chambers. Thermobarometry on metamorphic xenoliths yield temperature and pressure estimates of {approximately}780--900 C and 4--6 kb respectively, indicating that at least a portion of the deep magma system resided at depths from 14 to 21 km (9 to 12 mi). The results of thermal modeling support previous assessments of the high HDR potential of the area, and suggest the possibility that granitic bodies similar to The Geysers felsite may underlie much of the Clear Lake region at depths as little as 3--6 km. This is significant because future HDR reservoirs could potentially be sited in relatively shallow granitoid plutons rather than in structurally complex Franciscan basement rocks.

Stimac, J.; Goff, F.; Wohletz, K.

1997-06-01T23:59:59.000Z

168

Service Provider Competition: Delay Cost Structure, Segmentation, and Cost Advantage  

Science Conference Proceedings (OSTI)

We model competition between two providers who serve delay-sensitive customers. We compare a generalized delay cost structure, where a customer's delay cost depends on her service valuation, with the traditional additive delay cost structure, where the ... Keywords: delay cost structure, service competition, value-based market segmentation

Maxim Afanasyev; Haim Mendelson

2010-04-01T23:59:59.000Z

169

VCSEL fault location apparatus and method  

DOE Patents (OSTI)

An apparatus for locating a fault within an optical fiber is disclosed. The apparatus, which can be formed as a part of a fiber-optic transmitter or as a stand-alone instrument, utilizes a vertical-cavity surface-emitting laser (VCSEL) to generate a test pulse of light which is coupled into an optical fiber under test. The VCSEL is subsequently reconfigured by changing a bias voltage thereto and is used as a resonant-cavity photodetector (RCPD) to detect a portion of the test light pulse which is reflected or scattered from any fault within the optical fiber. A time interval .DELTA.t between an instant in time when the test light pulse is generated and the time the reflected or scattered portion is detected can then be used to determine the location of the fault within the optical fiber.

Keeler, Gordon A. (Albuquerque, NM); Serkland, Darwin K. (Albuquerque, NM)

2007-05-15T23:59:59.000Z

170

Clear Skies S. A. Clough Atmospheric and Environmental Research, Inc.  

NLE Websites -- All DOE Office Websites (Extended Search)

S. A. Clough S. A. Clough Atmospheric and Environmental Research, Inc. Cambridge, MA 02139 The objective of this research effort is to develop radiative transfer models that are consistent with Atmospheric Radiation Measurement (ARM) Program spectral radiance measurements for clear and cloudy atmospheres. Our approach is to develop the model physics and related databases with a line-by-line model in the context of available spectral radiance measurements. The line-by- line mode! then functions as an intermediate standard to both develop and validate rapid radiative transfer models appropriate to GCM applications. consistent with downlooking data taken with the high spectral resolution interferometer sounder (HIS) (Smith et al. 1983) from 20 km and with simultaneous data taken

171

Geometry of Cenozoic extensional faulting: Dixie Valley, Nevada | Open  

Open Energy Info (EERE)

Geometry of Cenozoic extensional faulting: Dixie Valley, Nevada Geometry of Cenozoic extensional faulting: Dixie Valley, Nevada Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Geometry of Cenozoic extensional faulting: Dixie Valley, Nevada Abstract Precise definition of geometric relationships between individual basins and ranges may help to reveal the mechanical processes of Basin and Range Cenozoic extensional faulting at depth. Previous studies have attempted to identify simple horsts and grabens, tilted crustal blocks with planar faulting, or tilted crustal blocks with listric faulting in the shallow crust. Normal faults defining these crustal blocks may root (1) individually in the ductile lower crust, (2) in regional or local low-angle detachment faults, or (3) in igneous intrusions or decoupling surfaces

172

Rough neural fault classification for hvdc power systems  

Science Conference Proceedings (OSTI)

This Ph.D. thesis proposes an approach to classify faults that commonly occur in a High Voltage Direct Current (HVDC) power system. These faults are distributed throughout the entire HVDC system. The most recently published techniques for power system ...

Liting Han

2008-01-01T23:59:59.000Z

173

Scalable Distributed Consensus to Support MPI Fault Tolerance  

Science Conference Proceedings (OSTI)

As system sizes increase, the amount of time in which an application can run without experiencing a failure decreases. Exascale applications will need to address fault tolerance. In order to support algorithm-based fault tolerance, communication libraries ...

Darius Buntinas

2012-05-01T23:59:59.000Z

174

MODELING AND SIMULATION OF HVAC FAULTS IN ENERGYPLUS  

E-Print Network (OSTI)

sensor faults, Energy and Buildings. 42(4). April 2010.faults in buildings. Energy and Buildings. 42(1). Januaryon the DOE-2 model, Energy and Buildings. 21(2). 1994, Pages

Basarkar, Mangesh

2013-01-01T23:59:59.000Z

175

Stability of Distributed Algorithms in the Face of Incessant Faults  

Science Conference Proceedings (OSTI)

For large distributed systems built from inexpensive components, one expects to see incessant failures. This paper proposes two models for such faults and analyzes two well-known self-stabilizing algorithms under these fault models. For a small number ...

Robert E. Lee Deville; Sayan Mitra

2009-11-01T23:59:59.000Z

176

Synthesis and evaluation of fault-tolerant quantum computer architectures  

E-Print Network (OSTI)

Fault-tolerance is the cornerstone of practical, large-scale quantum computing, pushed into its prominent position with heroic theoretical efforts. The fault-tolerance threshold, which is the component failure probability ...

Cross, Andrew W. (Andrew William), 1979-

2005-01-01T23:59:59.000Z

177

Design and Evaluation of Hybrid Fault-Detection Systems  

Science Conference Proceedings (OSTI)

As chip densities and clock rates increase, processors are becoming more susceptible to transient faults that can affect program correctness. Up to now, system designers have primarily considered hardware-only and software-only fault-detection mechanisms ...

George A. Reis; Jonathan Chang; Neil Vachharajani; Ram Rangan; David I. August; Shubhendu S. Mukherjee

2005-06-01T23:59:59.000Z

178

Two-person control administration: preventing administration faults through duplication  

Science Conference Proceedings (OSTI)

Modern computing systems are complex and difficult to administer, making them more prone to system administration faults. Faults can occur simply due to mistakes in the process of administering a complex system. These mistakes can make the system insecure ...

Shaya Potter; Steven M. Bellovin; Jason Nieh

2009-11-01T23:59:59.000Z

179

Fault Current Limiters (FCL) Fact Sheet | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

& Publications An Assessment of Fault Current Limiter Testing Requirements Superconductivity Program Overview Superconductivity for Electric Systems: 2008 Annual Peer Review...

180

EPRI Fault Current Management Guidebook, Sixth Edition (Maroon Book)  

Science Conference Proceedings (OSTI)

This document is an update of the document Fault Current Management Guidebook, Fifth Edition on fault current effects and management in transmission and distribution systems. This guide is intended to be a snapshot of available references, information, and literature on the effects of high fault current on a number of power system components and various available and emerging fault-current-limiting technologies.Results and FindingsDue to increased ...

2012-12-31T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Underground Cable Fault Location Reference and Application Guide  

Science Conference Proceedings (OSTI)

This report summarizes underground cable fault location methods and details the application of the methods for transmission and distribution cable systems. It summarizes both terminal location and tracer location methods that can be applied to transmission and distribution cable systems. The report is an update to a summary of fault location methods. It provides practical technical material in the art and science of locating cable faults, including a description of common fault location instruments and p...

2011-12-23T23:59:59.000Z

182

Understanding Fault Characteristics of Inverter-Based Distributed Energy Resources  

SciTech Connect

This report discusses issues and provides solutions for dealing with fault current contributions from inverter-based distributed energy resources.

Keller, J.; Kroposki, B.

2010-01-01T23:59:59.000Z

183

Department of Energy and USEC Announce Decision to Delay USEC...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

USEC Announce Decision to Delay USEC Loan Guarantee Application Final Review Department of Energy and USEC Announce Decision to Delay USEC Loan Guarantee Application Final Review...

184

Department of Energy and USEC Announce Decision to Delay USEC...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Department of Energy and USEC Announce Decision to Delay USEC Loan Guarantee Application Final Review Department of Energy and USEC Announce Decision to Delay USEC Loan Guarantee...

185

Fault Diagnosis of Transformer Based on Probabilistic Neural Network  

Science Conference Proceedings (OSTI)

In order to improve the correct rate of transformer fault diagnosis based on three-ratio method of traditional dissolved gas analysis (DGA), a novel intelligent transformer fault diagnosis method based on both DGA and probabilistic neural network (PNN) ... Keywords: transformer fault diagnosis, probabilistic neural network (PNN), improved three-ratio method

Li Song; Li Xiu-ying; Wang Wen-xu

2011-03-01T23:59:59.000Z

186

New Burnside Anticline: part of Fluorspar area fault complex  

SciTech Connect

Field mapping in the Abbott Formation and examination of topographic lineaments in the Creal Springs, Stonefort, Eddyville, and Harrisburg Quadrangles (southeastern Illinois) reveal the New Burnside anticline and its northeastern extension, the Stonefort anticline to be a single, extensively faulted structure. Interpretation of this evidence also leads to the conclusion that this is a fault-block structure rather than an anticline. Trending notheast-southwest, the structure seems to be the northwesternmost extent of the Fluorspar Area fault complex. The authors found evidence for two episodes of faulting. The first involved northeast-trending, high-angle faults similar to those in the known Fluorspar complex to the southeast. Faults on the northeast (Stonefort antilcine) step down toward the center of the structure, forming a graben. Vertical movement also occurred to the southwest (New Burnside anticline), but the structure in this vicinity is a horst with some blocks tilted. As with other faults in the Fluorspar complex, horizontal slickensides are present locally. The second episode of movement occurred along northwest-southeast-trending strike-slip faults that offset the northeast-trending high-angle faults. This second phase of faulting may correspond with previously reported reactivation of northwest-trending faults elsewhere in the Fluorspar Area fault complex.

Jacobson, R.J.; Trask, C.B.

1983-09-01T23:59:59.000Z

187

A lightweight fault tolerance framework for Web services  

Science Conference Proceedings (OSTI)

In this paper, we present the design and implementation of a lightweight fault tolerance framework for Web services. With our framework, a Web service can be rendered fault tolerant by replicating it across several nodes. A consensus-based algorithm ... Keywords: Fault tolerance, Web services, distributed consensus, reliable messaging, replication

Wenbing Zhao; Honglei Zhang; Hua Chai

2009-08-01T23:59:59.000Z

188

Collective operations in application-level fault-tolerant MPI  

Science Conference Proceedings (OSTI)

Fault-tolerance is becoming a critical issue on high-performance platforms. Checkpointing techniques make programs fault-tolerant by saving their state periodically and restoring this state after failure. System-level checkpointing saves the state ... Keywords: MPI, application-level checkpointing, collective communication, fault-tolerance, non-FIFO communication, scientific computing

Greg Bronevetsky; Daniel Marques; Keshav Pingali; Paul Stodghill

2003-06-01T23:59:59.000Z

189

Applications of fault detection methods to industrial processes  

Science Conference Proceedings (OSTI)

Components of industrial processes are often affected by un-permitted or un-expected deviations from normal operation behaviour. The fault detection task consists of determination of the fault present in a system and the time of detection. In addition ... Keywords: fault detection and diagnosis, industrial processes, residuals, symptoms

Ioana Fagarasan; S. S. T. Iliescu

2008-06-01T23:59:59.000Z

190

Rigorous Development of Dependable Systems Using Fault Tolerance Views  

Science Conference Proceedings (OSTI)

This paper introduces the Mode and Fault Tolerance Views approach to stepwise rigorous development of critical systems. It supports systematic, structured and recursive modelling of system fault tolerance, including error detection, error recovery and ... Keywords: formal methods, Event-B, fault tolerance, modal systems, case study, AOCS

Ilya Lopatkin; Alexei Iliasov; Alexander Romanovsky

2011-11-01T23:59:59.000Z

191

Yet Another Fault Injection Technique : by Forward Body Biasing Injection  

E-Print Network (OSTI)

expensive fault injection tech- niques, like clock or voltage glitches, are well taken into accountYet Another Fault Injection Technique : by Forward Body Biasing Injection K. TOBICH1,2, P. MAURINE1 Injection, Electromag- netic Attacks, RSA, Chinese Remainder Theorem 1 Introduction Fault injection

192

Statistical estimation of multiple faults in aircraft gas turbine engines  

E-Print Network (OSTI)

415 Statistical estimation of multiple faults in aircraft gas turbine engines S Sarkar, C Rao of multiple faults in aircraft gas-turbine engines, based on a statistical pattern recognition tool called commercial aircraft engine. Keywords: aircraft propulsion, gas turbine engines, multiple fault estimation

Ray, Asok

193

Outlier Detection Rules for Fault Detection in Solar Photovoltaic Arrays  

E-Print Network (OSTI)

fault detection. Furthermore, the proposed models become more reliable as the number of PV measurements analysis specifically for PV installation. Several fault detection models and monitoring systems have been studied for PV systems [8]­[14]. PV monitoring and fault detection models based on energy yield and power

Lehman, Brad

194

Fault reconnaissance agent for sensor networks  

Science Conference Proceedings (OSTI)

One of the key prerequisite for a scalable, effective and efficient sensor network is the utilization of low-cost, low-overhead and high-resilient fault-inference techniques. To this end, we propose an intelligent agent system with a problem solving ... Keywords: Management, expectation maximization algorithm, intelligent agents, wireless sensor networks

Elhadi M. Shakshuki; Xinyu Xing; Tarek R. Sheltami

2010-08-01T23:59:59.000Z

195

Optimized Fault Location Final Project Report  

E-Print Network (OSTI)

excessive currents and voltages last long enough to cause equipment damage. CBs have the purpose to connect describes connectivity of the various components in the power system. In order to process retrieved fault, the system topology must be known. Beside the connectivity it is necessary to obtain information about

196

Coordinated Fault Tolerance for High-Performance Computing  

SciTech Connect

Our work to meet our goal of end-to-end fault tolerance has focused on two areas: (1) improving fault tolerance in various software currently available and widely used throughout the HEC domain and (2) using fault information exchange and coordination to achieve holistic, systemwide fault tolerance and understanding how to design and implement interfaces for integrating fault tolerance features for multiple layers of the software stack—from the application, math libraries, and programming language runtime to other common system software such as jobs schedulers, resource managers, and monitoring tools.

Dongarra, Jack; Bosilca, George; et al.

2013-04-08T23:59:59.000Z

197

Active Fault Segments As Potential Earthquake Sources- Inferences From  

Open Energy Info (EERE)

Active Fault Segments As Potential Earthquake Sources- Inferences From Active Fault Segments As Potential Earthquake Sources- Inferences From Integrated Geophysical Mapping Of The Magadi Fault System, Southern Kenya Rift Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Active Fault Segments As Potential Earthquake Sources- Inferences From Integrated Geophysical Mapping Of The Magadi Fault System, Southern Kenya Rift Details Activities (0) Areas (0) Regions (0) Abstract: Southern Kenya Rift has been known as a region of high geodynamic activity expressed by recent volcanism, geothermal activity and high rate of seismicity. The active faults that host these activities have not been investigated to determine their subsurface geometry, faulting intensity and constituents (fluids, sediments) for proper characterization of tectonic

198

Definition: Enhanced Fault Detection Technology | Open Energy Information  

Open Energy Info (EERE)

Technology Technology Jump to: navigation, search Dictionary.png Enhanced Fault Detection Technology Enhanced fault detection technology enables higher precision and greater discrimination of fault location and type with coordinated measurement among multiple devices. For distribution applications, this technology can detect and isolate faults without full-power re-closing, reducing the frequency of through-fault currents. Using high resolution sensors and fault signatures, this technology can better detect high impedance faults. For transmission applications, this technology will employ high speed communications between multiple elements (e.g., stations) to protect entire regions, rather than just single elements. It can also use the latest digital techniques to advance beyond conventional impedance relaying of

199

Upper crustal faulting in an obliquely extending orogen, structural control  

Open Energy Info (EERE)

faulting in an obliquely extending orogen, structural control faulting in an obliquely extending orogen, structural control on permeability and production in the Coso Geothermal Field, eastern California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Upper crustal faulting in an obliquely extending orogen, structural control on permeability and production in the Coso Geothermal Field, eastern California Details Activities (1) Areas (1) Regions (0) Abstract: New multifold seismic reflection data from the Coso geothermal field in the central Coso Range, eastern California, image brittle faults and other structures in a zone of localized crustal extension between two major strike-slip faults. The Coso Wash fault, a Quaternary-active normal fault that is a locus of surface geothermal activity, is well-imaged as a

200

New method for abbreviating the fault tree graphical representation  

SciTech Connect

Fault tree analysis is being widely used for reliability and safety analysis of systems encountered in the nuclear industry and elsewhere. A disadvantage of the fault tree method is the voluminous fault tree graphical representation that conventionally results from analysis of a complex system. Previous methods for shortening the fault tree graphical representation include (1) transfers within the fault tree, and (2) the use of the SAMPLE (K out of N logic) gate, the MATRIX gate, and the SUMMATION gate. The purpose of this presentation is to introduce TABULATION gates as a method to abbreviate the fault tree graphical representation. These new gates reduce the cost of analysis and generally increase the system behavior visibility that is inherent in the fault tree technique. (auth)

Stewart, M.E.; Fussell, J.B.; Crump, R.J.

1974-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Delayed switching applied to memristor neural networks  

Science Conference Proceedings (OSTI)

Magnetic flux and electric charge are linked in a memristor. We reported recently that a memristor has a peculiar effect in which the switching takes place with a time delay because a memristor possesses a certain inertia. This effect was named the ''delayed switching effect.'' In this work, we elaborate on the importance of delayed switching in a brain-like computer using memristor neural networks. The effect is used to control the switching of a memristor synapse between two neurons that fire together (the Hebbian rule). A theoretical formula is found, and the design is verified by a simulation. We have also built an experimental setup consisting of electronic memristive synapses and electronic neurons.

Wang, Frank Z.; Yang Xiao; Lim Guan [Future Computing Group, School of Computing, University of Kent, Canterbury (United Kingdom); Helian Na [School of Computer Science, University of Hertfordshire, Hatfield (United Kingdom); Wu Sining [Xyratex, Havant (United Kingdom); Guo Yike [Department of Computing, Imperial College, London (United Kingdom); Rashid, Md Mamunur [CERN, Geneva (Switzerland)

2012-04-01T23:59:59.000Z

202

Improvements for group delay fringe tracking  

E-Print Network (OSTI)

Group delay fringe tracking using spectrally-dispersed fringes is suitable for stabilising the optical path difference in ground-based astronomical optical interferometers in low light situations. We discuss the performance of group delay tracking algorithms when the effects of atmospheric dispersion, high-frequency atmospheric temporal phase variations, non-ideal path modulation, non-ideal spectral sampling, and the detection artifacts introduced by electron-multiplying CCDs (EMCCDs) are taken into account, and we present ways in which the tracking capability can be optimised in the presence of these effects.

A. G. Basden; D. F. Buscher

2004-11-30T23:59:59.000Z

203

Uncertainty evaluation of delayed neutron decay parameters  

E-Print Network (OSTI)

In a nuclear reactor, delayed neutrons play a critical role in sustaining a controllable chain reaction. Delayed neutron’s relative yields and decay constants are very important for modeling reactivity control and have been studied for decades. Researchers have tried different experimental and numerical methods to assess these delayed neutron parameters. The reported parameter values vary widely, much more than the small statistical errors reported with these parameters. Interestingly, the reported parameters fit their individual measurement data well in spite of these differences. This dissertation focuses on evaluation of the errors and methods of delayed neutron relative yields and decay constants for thermal fission of U-235. Various numerical methods used to extract the delayed neutron parameter from the measured data, including Matrix Inverse, Levenberg-Marquardt, and Quasi-Newton methods, were studied extensively using simulated delayed neutron data. This simulated data was Poisson distributed around Keepin’s theoretical data. The extraction methods produced totally different results for the same data set, and some of the above numerical methods could not even find solutions for some data sets. Further investigation found that ill-conditioned matrices in the objective function were the reason for the inconsistent results. To find a reasonable solution with small variation, a regularization parameter was introduced using a numerical method called Ridge Regression. The results from the Ridge Regression method, in terms of goodness of fit to the data, were good and often better than the other methods. Due to the introduction of a regularization number in the algorithm, the fitted result contains a small additional bias, but this method can guarantee convergence no matter how large the coefficient matrix condition number. Both saturation and pulse modes were simulated to focus on different groups. Some of the factors that affect the solution stability were investigated including initial count rate, sample flight time, initial guess values. Finally, because comparing reported delayed neutron parameters among different experiments is useless to determine if their data actually differs, methods are proposed that can be used to compare the delayed neutron data sets.

Wang, Jinkai

2008-12-01T23:59:59.000Z

204

Neural net application to transmission line fault detection and classification  

E-Print Network (OSTI)

Today, in electric power systems, a large amount of data is made readily available at the occurrence of a fault due to the use of advanced communication systems, digital relays and fault recorders. Such systems are intended to obtain data from contacts of the relays and circuit breakers under operation. In addition, corresponding voltages and currents are recorded during prefault, fault and postfault periods. Restoration of power Systems after a fault occurred requires quick judgment. Hence, fault analysis, as the first step of restoration is very important. However, since faults in power systems are various and relaying systems may be complex, fault analysis is difficult to automate. Common practice in power utility companies, today, is to perform fault analysis by expert operators using their knowledge about the power systems and experience with past faults. Because of the time required to deal with complex fault situations, detailed fault analysis can not be performed by human operators in a short time. Therefore, on-line automated fault analysis system is strongly desired. Traditional approaches to the problem of analysis is to construct a heuristic, rule-based system which embodies a portion of the compiled experience of a human expert. These systems perform fault analysis by mapping fault indications to fault hypotheses. 'These hypotheses are used as inputs for next level of rules. After completion of inferencing process, conclusions are given. The knowledge acquisition process is exhaustive and time consuming. Also, data processing is usually too slow to be effectively applied in a real-time environment. Neural computing is one of the rapidly expanding areas of current research. Neural nets have some obvious advantages over expert systems. They are computationally more effective because of their parallel processing capabilities. Also, there is no need for detailed knowledge acquisition part, because neural nets learn by example. This thesis presents results of a study on using the new neural net system that can perform both on-line and off-line fault detection and classification. Fault analysis is conceptualized as a pattern classification problem which involves the association of input patterns representing the power system state to one or more fault conditions.

Rikalo, Igor

1994-01-01T23:59:59.000Z

205

Undulator Hall Air Temperature Fault Scenarios  

SciTech Connect

Recent experience indicates that the LCLS undulator segments must not, at any time following tuning, be allowed to change temperature by more than about {+-}2.5 C or the magnetic center will irreversibly shift outside of acceptable tolerances. This vulnerability raises a concern that under fault conditions the ambient temperature in the Undulator Hall might go outside of the safe range and potentially could require removal and retuning of all the segments. In this note we estimate changes that can be expected in the Undulator Hall air temperature for three fault scenarios: (1) System-wide power failure; (2) Heating Ventilation and Air Conditioning (HVAC) system shutdown; and (3) HVAC system temperature regulation fault. We find that for either a system-wide power failure or an HVAC system shutdown (with the technical equipment left on), the short-term temperature changes of the air would be modest due to the ability of the walls and floor to act as a heat ballast. No action would be needed to protect the undulator system in the event of a system-wide power failure. Some action to adjust the heat balance, in the case of the HVAC power failure with the equipment left on, might be desirable but is not required. On the other hand, a temperature regulation failure of the HVAC system can quickly cause large excursions in air temperature and prompt action would be required to avoid damage to the undulator system.

Sevilla, J.

2010-11-17T23:59:59.000Z

206

Isotopic evidence for the infiltration of mantle and metamorphic CO2-H2O fluids from below in faulted rocks from the San Andreas Fault System  

SciTech Connect

To characterize the origin of the fluids involved in the San Andreas Fault (SAF) system, we carried out an isotope study of exhumed faulted rocks from deformation zones, vein fillings and their hosts and the fluid inclusions associated with these materials. Samples were collected from segments along the SAF system selected to provide a depth profile from upper to lower crust. In all, 75 samples from various structures and lithologies from 13 localities were analyzed for noble gas, carbon, and oxygen isotope compositions. Fluid inclusions exhibit helium isotope ratios ({sup 3}He/{sup 4}He) of 0.1-2.5 times the ratio in air, indicating that past fluids percolating through the SAF system contained mantle helium contributions of at least 35%, similar to what has been measured in present-day ground waters associated with the fault (Kennedy et al., 1997). Calcite is the predominant vein mineral and is a common accessory mineral in deformation zones. A systematic variation of C- and O-isotope compositions of carbonates from veins, deformation zones and their hosts suggests percolation by external fluids of similar compositions and origin with the amount of fluid infiltration increasing from host rocks to vein to deformation zones. The isotopic trend observed for carbonates in veins and deformation zones follows that shown by carbonates in host limestones, marbles, and other host rocks, increasing with increasing contribution of deep metamorphic crustal volatiles. At each crustal level, the composition of the infiltrating fluids is thus buffered by deeper metamorphic sources. A negative correlation between calcite {delta}{sup 13}C and fluid inclusion {sup 3}He/{sup 4}He is consistent with a mantle origin for a fraction of the infiltrating CO{sub 2}. Noble gas and stable isotope systematics show consistent evidence for the involvement of mantle-derived fluids combined with infiltration of deep metamorphic H{sub 2}O and CO{sub 2} in faulting, supporting the involvement of deep fluids percolating through and perhaps weakening the fault zone. There is no clear evidence for a significant contribution from meteoric water, except for overprinting related to late weathering.

Pili, E.; Kennedy, B.M.; Conrad, M.E.; Gratier, J.-P.

2010-12-15T23:59:59.000Z

207

Calculating the probability of injected carbon dioxide plumes encountering faults  

Science Conference Proceedings (OSTI)

One of the main concerns of storage in saline aquifers is leakage via faults. In the early stages of site selection, site-specific fault coverages are often not available for these aquifers. This necessitates a method using available fault data to estimate the probability of injected carbon dioxide encountering and migrating up a fault. The probability of encounter can be calculated from areal fault density statistics from available data, and carbon dioxide plume dimensions from numerical simulation. Given a number of assumptions, the dimension of the plume perpendicular to a fault times the areal density of faults with offsets greater than some threshold of interest provides probability of the plume encountering such a fault. Application of this result to a previously planned large-scale pilot injection in the southern portion of the San Joaquin Basin yielded a 3% and 7% chance of the plume encountering a fully and half seal offsetting fault, respectively. Subsequently available data indicated a half seal-offsetting fault at a distance from the injection well that implied a 20% probability of encounter for a plume sufficiently large to reach it.

Jordan, P.D.

2011-04-01T23:59:59.000Z

208

Can we delay a greenhouse warming  

SciTech Connect

The author comments on the EPA report dated September 1983 Can We Delay A Greenhouse Warming. He takes exception to the widely-held interpretation that the answer is not much. The contribution of other greenhouse gases such as methane and nitrous oxide to the EPA scenarios is pointed out, and the lack of understanding of their role is emphasised. (ACR)

Perry, A.M.

1983-01-01T23:59:59.000Z

209

On reducing energy management delays in disks  

Science Conference Proceedings (OSTI)

Enterprise computing systems consume a large amount of energy, the cost of which contributes significantly to the operating budget. Consequently, dynamic energy management techniques are prevalent. Unfortunately, dynamic energy management for disks impose ... Keywords: Disk energy management, Peer memory sharing, Spin-up delay reduction

Krish K.R., Guanying Wang, Puranjoy Bhattacharjee, Ali R. Butt, Chris Gniady

2013-06-01T23:59:59.000Z

210

Application of Support Vector Machine (SVM) and Proximal Support Vector Machine (PSVM) for fault classification of monoblock centrifugal pump  

Science Conference Proceedings (OSTI)

Monoblock centrifugal pumps are widely used in a variety of applications. Defects and malfunctions (faults) of these pumps result in significant economic loss. Therefore, the pumps must be under constant monitoring. When a possible fault is detected, ... Keywords: CAV, PSVM, bearing faults, cavitation, decision trees, fault classification, fault diagnosis, impeller faults, monoblock centrifugal pumps, proximal SVM, seal faults, support vector machines, vibration signals

N. R. Sakthivel; V. Sugumaran; Binoy B. Nair

2010-12-01T23:59:59.000Z

211

Type E: Extensional Tectonic, Fault-Controlled Resource | Open Energy  

Open Energy Info (EERE)

Type E: Extensional Tectonic, Fault-Controlled Resource Type E: Extensional Tectonic, Fault-Controlled Resource Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Type E: Extensional Tectonic, Fault-Controlled Resource Dictionary.png Type E: Extensional Tectonic, Fault-Controlled Resource: No definition has been provided for this term. Add a Definition Brophy Occurrence Models This classification scheme was developed by Brophy, as reported in Updating the Classification of Geothermal Resources.[1] Type A: Magma-heated, Dry Steam Resource Type B: Andesitic Volcanic Resource Type C: Caldera Resource Type D: Sedimentary-hosted, Volcanic-related Resource Type E: Extensional Tectonic, Fault-Controlled Resource Type F: Oceanic-ridge, Basaltic Resource Extensional-tectonic, fault-controlled resources typically result from a

212

Fault Mapping At Raft River Geothermal Area (1993) | Open Energy  

Open Energy Info (EERE)

Fault Mapping At Raft River Geothermal Area (1993) Fault Mapping At Raft River Geothermal Area (1993) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Fault Mapping At Raft River Geothermal Area (1993) Exploration Activity Details Location Raft River Geothermal Area Exploration Technique Fault Mapping Activity Date 1993 Usefulness useful DOE-funding Unknown Exploration Basis Geologic mapping, strain and kinematic analysis Notes The mountains expose a detachment fault that separates a hanging wall of Paleozoic rocks from Proterozoic and Archean rocks of the footwall. Beneath the detachment lies a 100 to 300m-thick top-to-the-east extensional shear zone. Geologic mapping, strain and kinematic analysis, and 40Ar/39Ar thermochronology suggest that the shear zone and detachment fault had an

213

Active Faulting in the Coso Geothermal Field, Eastern California | Open  

Open Energy Info (EERE)

Faulting in the Coso Geothermal Field, Eastern California Faulting in the Coso Geothermal Field, Eastern California Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Active Faulting in the Coso Geothermal Field, Eastern California Details Activities (1) Areas (1) Regions (0) Abstract: New mapping documents a series of late Quaternary NNE-striking normal faults in the central Coso Range that dip northwest, toward and into the main production area of the Coso geothermal field. The faults exhibit geomorphic features characteristic of Holocene activity, and locally are associated with fumaroles and hydothermal alteration. The active faults sole into or terminate against the brittle-ductile transition zone (BDT) at a depth of about 4 to 5 km. The BDT is arched upward over a volume of crust

214

Scalable distributed consensus to support MPI fault tolerance.  

Science Conference Proceedings (OSTI)

As system sizes increase, the amount of time in which an application can run without experiencing a failure decreases. Exascale applications will need to address fault tolerance. In order to support algorithm-based fault tolerance, communication libraries will need to provide fault-tolerance features to the application. One important fault-tolerance operation is distributed consensus. This is used, for example, to collectively decide on a set of failed processes. This paper describes a scalable, distributed consensus algorithm that is used to support new MPI fault-tolerance features proposed by the MPI 3 Forum's fault-tolerance working group. The algorithm was implemented and evaluated on a 4,096-core Blue Gene/P. The implementation was able to perform a full-scale distributed consensus in 305 {mu}s and scaled logarithmically.

Buntinas, D. (Mathematics and Computer Science)

2011-01-01T23:59:59.000Z

215

Similarity Matching Techniques for Fault Diagnosis in Automotive Infotainment Electronics  

E-Print Network (OSTI)

Fault diagnosis has become a very important area of research during the last decade due to the advancement of mechanical and electrical systems in industries. The automobile is a crucial field where fault diagnosis is given a special attention. Due to the increasing complexity and newly added features in vehicles, a comprehensive study has to be performed in order to achieve an appropriate diagnosis model. A diagnosis system is capable of identifying the faults of a system by investigating the observable effects (or symptoms). The system categorizes the fault into a diagnosis class and identifies a probable cause based on the supplied fault symptoms. Fault categorization and identification are done using similarity matching techniques. The development of diagnosis classes is done by making use of previous experience, knowledge or information within an application area. The necessary information used may come from several sources of knowledge, such as from system analysis. In this paper similarity matching tec...

Kabir, Mashud

2009-01-01T23:59:59.000Z

216

Impact of Wind Power Integration on Fault Current Management  

Science Conference Proceedings (OSTI)

This report presents a study on the impact of wind power integration on the grid fault current level due to various types of faults that might take place inside or outside of wind farms. Wind power is one of the renewable energy sources that has shown tremendous growth in recent years. The increasing integration of wind energy generation and other distributed renewable energy generation could change grid behavior under fault situations and influence system stability. Specifically, integration of addition...

2010-01-14T23:59:59.000Z

217

Enhancing and Testing Fast Fault Screening (FFS) Methodology  

Science Conference Proceedings (OSTI)

The aim of this multi-year study is to develop a methodology for fast prediction of the most severe three-phase fault locations for transient stability studies and rank them in order of severity. The methodology is called Fast Fault Screening (FFS).  The key advantage of the FFS is the ability to quickly scan through thousands of potential fault locations from transient stability perspective and identify the most severe locations. In the previous efforts, FFS was developed for angular ...

2012-12-31T23:59:59.000Z

218

Timer-based composition of fault-containing self-stabilizing protocols  

Science Conference Proceedings (OSTI)

One of the desired properties of distributed systems is self-adaptability against faults. Self-stabilizing protocols provide autonomous recovery from any finite number of transient faults. However, in practice, catastrophic faults rarely occur, while ... Keywords: Distributed system, Fault tolerance, Fault-containment, Hierarchical composition, Self-adaptability, Self-stabilization, Synchronizer, Timer

Yukiko Yamauchi; Sayaka Kamei; Fukuhito Ooshita; Yoshiaki Katayama; Hirotsugu Kakugawa; Toshimitsu Masuzawa

2010-05-01T23:59:59.000Z

219

Historic Surface Faulting and Paleoseismicity in the Area of...  

Open Energy Info (EERE)

Historic Surface Faulting and Paleoseismicity in the Area of the 1954 Rainbow Mountain-Stillwater Earthquake Sequence, Central Nevada Jump to: navigation, search OpenEI Reference...

220

Low-cost motor drive embedded fault diagnosis systems  

E-Print Network (OSTI)

Electric motors are used widely in industrial manufacturing plants. Bearing faults, insulation faults, and rotor faults are the major causes of electric motor failures. Based on the line current analysis, this dissertation mainly deals with the low cost incipient fault detection of inverter-fed driven motors. Basically, low order inverter harmonics contributions to fault diagnosis, a motor drive embedded condition monitoring method, analysis of motor fault signatures in noisy line current, and a few specific applications of proposed methods are studied in detail. First, the effects of inverter harmonics on motor current fault signatures are analyzed in detail. The introduced fault signatures due to harmonics provide additional information about the motor faults and enhance the reliability of fault decisions. It is theoretically and experimentally shown that the extended fault signatures caused by the inverter harmonics are similar and comparable to those generated by the fundamental harmonic on the line current. In the next chapter, the reference frame theory is proposed as a powerful toolbox to find the exact magnitude and phase quantities of specific fault signatures in real time. The faulty motors are experimentally tested both offline, using data acquisition system, and online, employing the TMS320F2812 DSP to prove the effectiveness of the proposed tool. In addition to reference frame theory, another digital signal processor (DSP)-based phasesensitive motor fault signature detection is presented in the following chapter. This method has a powerful line current noise suppression capability while detecting the fault signatures. It is experimentally shown that the proposed method can determine the normalized magnitude and phase information of the fault signatures even in the presence of significant noise. Finally, a signal processing based fault diagnosis scheme for on-board diagnosis of rotor asymmetry at start-up and idle mode is presented. It is quite challenging to obtain these regular test conditions for long enough time during daily vehicle operations. In addition, automobile vibrations cause a non-uniform air-gap motor operation which directly affects the inductances of electric motor and results quite noisy current spectrum. The proposed method overcomes the challenges like aforementioned ones simply by testing the rotor asymmetry at zero speed.

Akin, Bilal

2007-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Intersecting Fault Trends and Crustal-Scale Fluid Pathways Below...  

Open Energy Info (EERE)

Intersecting Fault Trends and Crustal-Scale Fluid Pathways Below the Dixie Valley Geothermal Area, Nevada, Inferred from 3d Magnetotelluric Surveying Jump to: navigation, search...

222

Thermal Waters Along The Konocti Bay Fault Zone, Lake County...  

Open Energy Info (EERE)

Thermal Waters Along The Konocti Bay Fault Zone, Lake County, California- A Re-Evaluation Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Thermal...

223

Fault Detection and Diagnosis in Building HVAC Systems  

E-Print Network (OSTI)

diagnostic method for vapor compression air conditioners”,evaluation of faults in vapor compression cycle equipment”,Diagnostic Methods to Vapor Compression Cooling Equipment“,

Najafi, Massieh

2010-01-01T23:59:59.000Z

224

Upper crustal faulting in an obliquely extending orogen, structural...  

Open Energy Info (EERE)

faulting in an obliquely extending orogen, structural control on permeability and production in the Coso Geothermal Field, eastern California Jump to: navigation, search...

225

Dynamic analysis and fault diagnosis of a water hydraulic motor.  

E-Print Network (OSTI)

??This research is concerned with condition monitoring and fault diagnosis of the piston of the water hydraulic motor by vibration signal analysis. Vibration signatures are… (more)

Chen, Hanxin.

2008-01-01T23:59:59.000Z

226

MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION...  

Open Energy Info (EERE)

MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION WITHIN THE COSO GETHERMAL FIELD, CALIFORNIA Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home...

227

CiFTS : Coordinated Infrastructure for Fault Tolerant Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

Demos Team News Contact Us Coordinated and Improved Fault Tolerance for High Performance Computing Systems In the next few years SciDAC applications will utilize exascale...

228

Petri net modeling of fault analysis for probabilistic risk assessment.  

E-Print Network (OSTI)

??Fault trees and event trees have been widely accepted as the modeling strategy to perform Probabilistic Risk Assessment (PRA). However, there are several limitations associated… (more)

Lee, Andrew

2013-01-01T23:59:59.000Z

229

An Assessment of Fault Current Limiter Testing Requirements ...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Energy Reliability (OE) is conducting research and development (R&D) on next-generation electricity delivery equipment including fault current limiters (FCLs). Prototype FCL...

230

Recurrent faulting and petroleum accumulation, Cat Creek Anticline, central Montana  

SciTech Connect

The Cat Creek anticline, scene of central Montana's first significant oil discovery, is underlain by a south-dipping high-angle fault (Cat Creek fault) that has undergone several episodes of movement with opposite sense of displacement. Borehole data suggest that the Cat Creek fault originated as a normal fault during Proterozoic rifting concurrent with deposition of the Belt Supergroup. Reverse faulting took place in Late Cambrian time, and again near the end of the Devonian Period. The Devonian episode, coeval with the Antler orogeny, raised the southern block several hundred feet. The southern block remained high through Meramecian time, then began to subside. Post-Atokan, pre-Middle Jurassic normal faulting lowered the southern block as much as 1,500 ft. During the Laramide orogeny (latest Cretaceous-Eocene) the Cat Creek fault underwent as much as 4,000 ft of reverse displacement and a comparable amount of left-lateral displacement. The Cat Creek anticline is a fault-propagation fold; en echelon domes and listric normal faults developed along its crest in response to wrenching. Oil was generated mainly in organic-rich shales of the Heath Formation (upper Chesterian Series) and migrated upward along tectonic fractures into Pennsylvanian, Jurassic, and Cretaceous reservoir rocks in structural traps in en echelon domes. Production has been achieved only from those domes where structural closure was retained from Jurassic through Holocene time.

Nelson, W.J. (Illinois State Geological Survey, Champaign (United States))

1991-06-01T23:59:59.000Z

231

Cryptic Faulting and Multi-Scale Geothermal Fluid Connections...  

Open Energy Info (EERE)

Cryptic Faulting and Multi-Scale Geothermal Fluid Connections in the Dixie Valley-Central Nevada Seismic Belt Area- Implications from Mt Resistivity Surveying Jump to: navigation,...

232

Recency Of Faulting And Neotechtonic Framework In The Dixie Valley...  

Open Energy Info (EERE)

Recency Of Faulting And Neotechtonic Framework In The Dixie Valley Geothermal Field And Other Geothermal Fields Of The Basin And Range Jump to: navigation, search GEOTHERMAL...

233

Recent earthquake sequences at Coso: Evidence for conjugate faulting...  

Open Energy Info (EERE)

Recent earthquake sequences at Coso: Evidence for conjugate faulting and stress loading near a geothermal field Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal...

234

The Clear-Sky Greenhouse Effect Sensitivity to a Sea Surface Temperature Change  

Science Conference Proceedings (OSTI)

The clear-sky greenhouse effect response to a sea surface temperature (SST or Ts) change is studied using outgoing clear-sky longwave radiation measurements from the Earth Radiation Budget Experiment (ERBE). Considering geographical distributions ...

J. Ph Duvel; F. M. Bréon

1991-12-01T23:59:59.000Z

235

Fault Prediction and Fault-Tolerant of Lithium-ion Batteries Temperature Failure for Electric Vehicle  

Science Conference Proceedings (OSTI)

Design and implementation of dual-redundancy was developed to predict Lithium-ion battery failure for electric vehicle. Data fusion unit, prediction unit and determination unit were designed. Outputs from original and redundant sensors were integrated ... Keywords: Lithium-ion battery, dual-redundancy, data fusion, prediction, Fault-tolerant

Hu Chunhua; He Ren; Wang Runcai; Yu Jianbo

2012-07-01T23:59:59.000Z

236

A fuzzy neural network based fault detection scheme for synchronous generator with internal fault  

Science Conference Proceedings (OSTI)

A fuzzy neural network (FNN) based inter-turn short circuit fault detection scheme for generator is proposed. The second harmonic magnitude of field current and the negative sequence components of voltages and currents are used as inputs for the FNN ...

Hongwei Fang; Changliang Xia

2009-08-01T23:59:59.000Z

237

Prototyping a fault-tolerant multiprocessor SoC with run-time fault recovery  

Science Conference Proceedings (OSTI)

Modern integrated circuits (ICs) are becoming increasingly complex. The complexity makes it difficult to design, manufacture and integrate these high performance ICs. The advent of multiprocessor Systems-on-chips (SoCs) makes it even more challenging ... Keywords: fault-tolerance, multiprocessor system, network-on-chip, retargetable simulation, run-time verification, system-on-chip

Xinping Zhu; Wei Qin

2006-07-01T23:59:59.000Z

238

Fundamentals of Delayed Coking Joint Industry Project  

SciTech Connect

Delayed coking evolved steadily over the early to mid 1900s to enable refiners to convert high boiling, residual petroleum fractions to light products such as gasoline. Pound for pound, coking is the most energy intensive of any operation in a modern refinery. Large amounts of energy are required to heat the thick, poor-quality petroleum residuum to the 900 to 950 degrees F required to crack the heavy hydrocarbon molecules into lighter, more valuable products. One common misconception of delayed coking is that the product coke is a disadvantage. Although coke is a low valued (near zero economic value) byproduct, compared to transportation fuels, there is a significant worldwide trade and demand for coke as it is an economical fuel. Coke production has increased steadily over the last ten years, with further increases forecast for the foreseeable future. Current domestic production is near 111,000 tons per day. A major driving force behind this increase is the steady decline in crude quality available to refiners. Crude slates are expected to grow heavier with higher sulfur contents while environmental restrictions are expected to significantly reduce the demand for high-sulfur residual fuel oil. Light sweet crudes will continue to be available and in even greater demand than they are today. Refiners will be faced with the choice of purchasing light sweet crudes at a premium price, or adding bottom of the barrel upgrading capability, through additional new investments, to reduce the production of high-sulfur residual fuel oil and increase the production of low-sulfur distillate fuels. A second disadvantage is that liquid products from cokers frequently are unstable, i.e., they rapidly form gum and sediments. Because of intermediate investment and operating costs, delayed coking has increased in popularity among refiners worldwide. Based on the 2000 Worldwide Refining Survey published in the Oil and Gas, the delayed coking capacity for 101 refineries around the world is 2,937,439 barrels/calendar day. These cokers produce 154,607 tons of coke per day and delayed coking accounts for 88% of the world capacity. The delayed coking charge capacity in the United States is 1,787,860 b/cd. Despite its wide commercial use, only relatively few contractors and refiners are truly knowledgeable in delayed-coking design, so that this process carries with it a ''black art'' connotation. Until recently, the expected yield from cokers was determined by a simple laboratory test on the feedstock. As a result of Tulsa University's prior related research, a process model was developed that with additional work could be used to optimize existing delayed cokers over a wide range of potential feedstocks and operating conditions. The objectives of this research program are to: utilize the current micro, batch and pilot unit facilities at The University of Tulsa to enhance the understanding of the coking process; conduct additional micro and pilot unit tests with new and in-house resids and recycles to make current optimization models more robust; conduct focused kinetic experiments to enhance the furnace tube model and to enhance liquid production while minimizing sulfur in the products; conduct detailed foaming studies to optimize the process and minimize process upsets; quantify the parameters that affect coke morphology; and to utilize the knowledge gained from the experimental and modeling studies to enhance the computer programs developed in the previous JIP for optimization of the coking process. These refined computer models will then be tested against refinery data provided by the member companies. Novel concepts will also be explored for hydrogen sulfide removal of furnace gases as well as gas injection studies to reduce over-cracking.

Michael Volk; Keith Wisecarver

2003-09-26T23:59:59.000Z

239

Fundamentals of Delayed Coking Joint Industry Project  

SciTech Connect

Delayed coking evolved steadily over the early to mid 1900s to enable refiners to convert high boiling, residual petroleum fractions to light products such as gasoline. Pound for pound, coking is the most energy intensive of any operation in a modern refinery. Large amounts of energy are required to heat the thick, poor-quality petroleum residuum to the 900 to 950 degrees F required to crack the heavy hydrocarbon molecules into lighter, more valuable products. One common misconception of delayed coking is that the product coke is a disadvantage. Although coke is a low valued (near zero economic value) byproduct, compared to transportation fuels, there is a significant worldwide trade and demand for coke as it is an economical fuel. Coke production has increased steadily over the last ten years, with further increases forecast for the foreseeable future. Current domestic production is near 111,000 tons per day. A major driving force behind this increase is the steady decline in crude quality available to refiners. Crude slates are expected to grow heavier with higher sulfur contents while environmental restrictions are expected to significantly reduce the demand for high-sulfur residual fuel oil. Light sweet crudes will continue to be available and in even greater demand than they are today. Refiners will be faced with the choice of purchasing light sweet crudes at a premium price, or adding bottom of the barrel upgrading capability, through additional new investments, to reduce the production of high-sulfur residual fuel oil and increase the production of low-sulfur distillate fuels. A second disadvantage is that liquid products from cokers frequently are unstable, i.e., they rapidly form gum and sediments. Because of intermediate investment and operating costs, delayed coking has increased in popularity among refiners worldwide. Based on the 2000 Worldwide Refining Survey published in the Oil and Gas, the delayed coking capacity for 101 refineries around the world is 2,937,439 barrels/calendar day. These cokers produce 154,607 tons of coke per day and delayed coking accounts for 88% of the world capacity. The delayed coking charge capacity in the United States is 1,787,860 b/cd. Despite its wide commercial use, only relatively few contractors and refiners are truly knowledgeable in delayed-coking design, so that this process carries with it a ''black art'' connotation. Until recently, the expected yield from cokers was determined by a simple laboratory test on the feedstock. As a result of Tulsa University's prior related research, a process model was developed that with additional work could be used to optimize existing delayed cokers over a wide range of potential feedstocks and operating conditions. The objectives of this research program are to: utilize the current micro, batch and pilot unit facilities at The University of Tulsa to enhance the understanding of the coking process; conduct additional micro and pilot unit tests with new and in-house resids and recycles to make current optimization models more robust; conduct focused kinetic experiments to enhance the furnace tube model and to enhance liquid production while minimizing sulfur in the products; conduct detailed foaming studies to optimize the process and minimize process upsets; quantify the parameters that affect coke morphology; and to utilize the knowledge gained from the experimental and modeling studies to enhance the computer programs developed in the previous JIP for optimization of the coking process. These refined computer models will then be tested against refinery data provided by the member companies. Novel concepts will also be explored for hydrogen sulfide removal of furnace gases as well as gas injection studies to reduce over-cracking.

Michael Volk; Keith Wisecarver

2004-09-26T23:59:59.000Z

240

Coherence delay augmented laser beam homogenizer  

SciTech Connect

The geometrical restrictions on a laser beam homogenizer are relaxed by ug a coherence delay line to separate a coherent input beam into several components each having a path length difference equal to a multiple of the coherence length with respect to the other components. The components recombine incoherently at the output of the homogenizer, and the resultant beam has a more uniform spatial intensity suitable for microlithography and laser pantogography. Also disclosed is a variable aperture homogenizer, and a liquid filled homogenizer.

Rasmussen, Paul (Livermore, CA); Bernhardt, Anthony (Berkeley, CA)

1993-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

The University of Texas at Austin Jan-03 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan-03 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1/93) #12;The University of Texas at Austin Feb-03 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1/93) #12;The University of Texas at Austin Mar-03 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1

Johns, Russell Taylor

242

Monitoring of IR Clear-Sky Radiances over Oceans for SST (MICROS)  

Science Conference Proceedings (OSTI)

Monitoring of IR Clear-Sky Radiances over Oceans for SST (MICROS) is a Web-based tool to monitor “model minus observation” (M ? O) biases in clear-sky brightness temperatures (BTs) and sea surface temperatures (SSTs) produced by the Advanced Clear-...

Xingming Liang; Alexander Ignatov

2011-10-01T23:59:59.000Z

243

Structural geology of Shawneetown fault zone, Southeastern Illinois  

SciTech Connect

Vertical movements of crustal blocks along the narrow east-west-trending Shawneetown fault zone in southeastern Illinois occurred between Early Permian and Late Cretaceous. The main blocks moved vertically and retured to roughly their orignal positions so that strata now show little relative offset across the fault zone. However, individual faults with displacements up to 3,500 ft (1,070 m) bound narrow slices of steeply tilted or overturned strata resulting in a juxtaposition of Kinderhookian (Lower Mississippian) and Upper Devonian strata with Lower Pennsylvanina strata. The bedrock is intensely fractured, commonly brecciated, and cemented with either silica or calcite. Slickensides and mullion display various orientations within the zone and on individual outcrops. The dominant movement, however, appears to be vertical with no evidence for significant strike-slip movements. Pleistocene deposits do not exhibit offsets across the fault zone, indicating that no tectonic activity has occurred since the beginning of that epoch. The trend of the fault zone changes abruptly from east-west in southern Gallatin and easternmost Saline Counties to south-southwest in southern Saline and northeastern Pope Counties, where it joins the Fluorspar area fault complex. Here the zone widens and develops a braided pattern as the amount of displacement along individual faults decreases. The Shawneetown fault zone and Flourspar area fault complex in part are younger than the Cottage Grove fault system to the northwest and the Wabash Valley fault system to the north. The hope of finding structural traps near the junctions of the fuel systems has spurred recent oil exploration in the area.

Lumm, D.K.; Nelson, W.J.

1983-09-01T23:59:59.000Z

244

Automating Power System Fault Diagnosis through Multi-Agent System Technology  

Science Conference Proceedings (OSTI)

Fault diagnosis within electrical power systems is a time consuming and complex task. SCADA systems, digital fault recorders, travelling wave fault locators and other monitoring devices are drawn upon to inform the engineers of incidents, problems and ...

S. D. J. McArthur; E. M. Davidson; J. A. Hossack; J. R. McDonald

2004-01-01T23:59:59.000Z

245

Feng shui of supercomputer memory: positional effects in DRAM and SRAM faults  

Science Conference Proceedings (OSTI)

Several recent publications confirm that faults are common in high-performance computing systems. Therefore, further attention to the faults experienced by such computing systems is warranted. In this paper, we present a study of DRAM and SRAM faults ...

Vilas Sridharan, Jon Stearley, Nathan DeBardeleben, Sean Blanchard, Sudhanva Gurumurthi

2013-11-01T23:59:59.000Z

246

Bayesian Inference Underlies the Contraction Bias in Delayed Comparison Tasks  

E-Print Network (OSTI)

Delayed comparison tasks are widely used in the study of working memory and perception in psychology and neuroscience.

Ashourian, Paymon

247

Forward correction and fountain codes in delay-tolerant networks  

Science Conference Proceedings (OSTI)

Delay-tolerant ad hoc networks leverage the mobility of relay nodes to compensate for lack of permanent connectivity and thus enable communication between nodes that are out of range of each other. To decrease delivery delay, the information to be delivered ... Keywords: delay-tolerant networks (DTNs), forward correction, fountain codes, mobile ad hoc networks

Eitan Altman; Francesco De Pellegrini

2011-02-01T23:59:59.000Z

248

First step towards automatic correction of firewall policy faults  

Science Conference Proceedings (OSTI)

Firewalls are critical components of network security and have been widely deployed for protecting private networks. A firewall determines whether to accept or discard a packet that passes through it based on its policy. However, most real-life firewalls ... Keywords: Automatic fault fixing, firewall faults, firewall policy

Fei Chen; Alex X. Liu; Jeehyun Hwang; Tao Xie

2012-07-01T23:59:59.000Z

249

Fault Diagnosis of Transformer Based on Random Forest  

Science Conference Proceedings (OSTI)

Fault diagnosis of transformer in power system is studied in this paper. Considering the excellent performances of Random Forest (RF) in pattern recognition, we apply RF to construct a diagnosis model to predict the situation of transformer. The experiments ... Keywords: Rondom Forest, fault diagnosis of transformer, classification model

Xi Chen; Hongmei Cui; Linkai Luo

2011-03-01T23:59:59.000Z

250

Towards Robustness in Neural Network Based Fault Diagnosis  

Science Conference Proceedings (OSTI)

Challenging design problems arise regularly in modern fault diagnosis systems. Unfortunately, classical analytical techniques often cannot provide acceptable solutions to such difficult tasks. This explains why soft computing techniques such as neural ... Keywords: Dynamic Neural Network, Fault Diagnosis, Gmdh Neural Network, Robustness

Krzysztof Patan; Marcin Witczak; JóZef Korbicz

2008-12-01T23:59:59.000Z

251

Fault detection in multivariate signals with applications to gas turbines  

Science Conference Proceedings (OSTI)

This paper proposes a fault detection method for multivariate signals. The method assesses whether or not the multivariate autocovariance functions of two independently sampled system signals coincide. If the first signal is known to be sampled from ... Keywords: autocovariances, fault detection, spectral analysis, stationary time series

Hany Bassily; Robert Lund; John Wagner

2009-03-01T23:59:59.000Z

252

Symbolic identification for fault detection in aircraft gas turbine engines  

E-Print Network (OSTI)

Symbolic identification for fault detection in aircraft gas turbine engines S Chakraborty, S Sarkar and computationally inexpensive technique of component-level fault detection in aircraft gas-turbine engines identification, gas turbine engines, language-theoretic analysis 1 INTRODUCTION The propulsion system of modern

Ray, Asok

253

CUDA accelerated fault tree analysis with C-XSC  

Science Conference Proceedings (OSTI)

Fault tree analysis is a widespread mathematical method for determining the failure probability of observed real-life systems. In addition to failure probability defined by wear, the system model has to take into account intrinsic and extrinsic system ... Keywords: C-XSC, CUDA, DSI, fault tree analysis

Gabor Rebner; Michael Beer

2012-09-01T23:59:59.000Z

254

GPS satellite oscillator faults mimicking ionospheric phase scintillation  

Science Conference Proceedings (OSTI)

It is possible for unreported Global Positioning System satellite faults to cause phase variations mimicking the effect of ionospheric scintillation. A case study of an event on 17 May, 2011 is presented. For approximately 695 s, the L1 signal from the ... Keywords: Anomaly, Fault, Navstar 43, PRN 13, Scintillation, Sigma-phi

Christopher J. Benton; Cathryn N. Mitchell

2012-10-01T23:59:59.000Z

255

COMPLETE FAULT ANALYSIS FOR LONG TRANSMISSION LINE USING  

E-Print Network (OSTI)

Plants and Power Systems Control, Kananaskis, Canada, 2006 #12;Area Measurement System (WAMS) and Phasor variables. Methods based on traveling waves and recently based on fault- generated high-frequency transients of the fault location. This method will be more attractive when the concept of Wide IFAC Symposium on Power

256

Online Fault Detection and Tolerance for Photovoltaic Energy Harvesting Systems  

E-Print Network (OSTI)

Online Fault Detection and Tolerance for Photovoltaic Energy Harvesting Systems Xue Lin 1 , Yanzhi, yanzhiwa, dizhu, pedram}@usc.edu, 2 naehyuck@elpl.snu.ac.kr ABSTRACT Photovoltaic energy harvesting systems (PV systems) are subject to PV cell faults, which decrease the efficiency of PV systems and even

Pedram, Massoud

257

Soft computing approach to fault diagnosis of centrifugal pump  

Science Conference Proceedings (OSTI)

Fault detection and isolation in rotating machinery is very important from an industrial viewpoint as it can help in maintenance activities and significantly reduce the down-time of the machine, resulting in major cost savings. Traditional methods have ... Keywords: Centrifugal pump, Decision tree algorithm, Fault diagnosis, Gene expression programming, Proximal support vector machine, Statistical features, Support vector machine

N. R. Sakthivel; Binoy.B.Nair; V. Sugumaran

2012-05-01T23:59:59.000Z

258

ANFIS based sensor fault detection for continuous stirred tank reactor  

Science Conference Proceedings (OSTI)

In this paper, an Adaptive Neuro-Fuzzy Inference System (ANFIS) based Sensor fault detection and isolation for Continuous Stirred Tank Reactor (CSTR) is proposed. CSTR is a highly nonlinear process exhibiting stable and unstable steady state at different ... Keywords: ANFIS observer, Continuous stirred tank reactor, Dedicated observer, Fault detection

U. Sabura Banu; G. Uma

2011-03-01T23:59:59.000Z

259

Increasing fault-tolerance in cellular automata-based systems  

Science Conference Proceedings (OSTI)

In the light of emergence of cellular computing, new cellular computing systems based on yet-unknown methods of fabrication need to address the problem of fault tolerance in a way which is not tightly connected to used technology. This may not be possible ... Keywords: Byl's loop, Game of Life, TMR, cellular automata, cellular computing, fault tolerance, rule 30, static module redundance

Lud?k Žaloudek; Lukáš Sekanina

2011-06-01T23:59:59.000Z

260

Automatic Fault Characterization via Abnormality-Enhanced Classification  

Science Conference Proceedings (OSTI)

Enterprise and high-performance computing systems are growing extremely large and complex, employing hundreds to hundreds of thousands of processors and software/hardware stacks built by many people across many organizations. As the growing scale of these machines increases the frequency of faults, system complexity makes these faults difficult to detect and to diagnose. Current system management techniques, which focus primarily on efficient data access and query mechanisms, require system administrators to examine the behavior of various system services manually. Growing system complexity is making this manual process unmanageable: administrators require more effective management tools that can detect faults and help to identify their root causes. System administrators need timely notification when a fault is manifested that includes the type of fault, the time period in which it occurred and the processor on which it originated. Statistical modeling approaches can accurately characterize system behavior. However, the complex effects of system faults make these tools difficult to apply effectively. This paper investigates the application of classification and clustering algorithms to fault detection and characterization. We show experimentally that naively applying these methods achieves poor accuracy. Further, we design novel techniques that combine classification algorithms with information on the abnormality of application behavior to improve detection and characterization accuracy. Our experiments demonstrate that these techniques can detect and characterize faults with 65% accuracy, compared to just 5% accuracy for naive approaches.

Bronevetsky, G; Laguna, I; de Supinski, B R

2010-12-20T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Research on Fault Location of Power Cable with Wavelet Analysis  

Science Conference Proceedings (OSTI)

This article researChes for 10kV transmission cable form the ground substation to the underground central substation in the coal mine. The transient traveLing wave signal of the cable fault is disposed by the wavelet transformation based on the cable ... Keywords: Wavelet analysis, Fault Location, TraveLing wave

Ji-meng Zhang; Shuo Liang

2011-08-01T23:59:59.000Z

262

Effects of unbalanced faults on transient stability of cogeneration system  

Science Conference Proceedings (OSTI)

This paper evaluates the effects of unbalanced faults on the transient stability of a real cogeneration plant. First, a brief is given for the structure of the cogeneration system. Use of the electromagnetic transient program (EMTP) constructs the cogeneration ... Keywords: CCT curve, EMTP, cogeneration plant, transient stability, unbalanced faults

Wei-Neng Chang; Chia-Han Hsu

2011-10-01T23:59:59.000Z

263

Helix Wind Inc formerly ClearView Acquisitions | Open Energy Information  

Open Energy Info (EERE)

Helix Wind Inc formerly ClearView Acquisitions Helix Wind Inc formerly ClearView Acquisitions Jump to: navigation, search Name Helix Wind Inc. (formerly ClearView Acquisitions) Place San Diego, California Zip 92113 Sector Wind energy Product California-based manufacturer of small scale wind turbines. References Helix Wind Inc. (formerly ClearView Acquisitions)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Helix Wind Inc. (formerly ClearView Acquisitions) is a company located in San Diego, California . References ↑ "Helix Wind Inc. (formerly ClearView Acquisitions)" Retrieved from "http://en.openei.org/w/index.php?title=Helix_Wind_Inc_formerly_ClearView_Acquisitions&oldid=346471"

264

Probability Estimation of CO2 Leakage Through Faults at Geologic Carbon Sequestration Sites  

E-Print Network (OSTI)

for Geologic Carbon Sequestration Based on EffectiveFaults at Geologic Carbon Sequestration Sites Yingqi Zhang*,faults at geologic carbon sequestration (GCS) sites is a

Zhang, Yingqi

2009-01-01T23:59:59.000Z

265

Fault Analysis at a Wind Power Plant for One Year of Observation: Preprint  

DOE Green Energy (OSTI)

This paper analyzes the fault characteristics observed at a wind power plant, and the behavior of the wind power plant under fault events.

Muljadi, E.; Mills, Z.; Foster, R.; Conto, J.; Ellis, A.

2008-07-01T23:59:59.000Z

266

Dating of major normal fault systems using thermochronology- An example  

Open Energy Info (EERE)

Dating of major normal fault systems using thermochronology- An example Dating of major normal fault systems using thermochronology- An example from the Raft River detachment, Basin and Range, western United States Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Dating of major normal fault systems using thermochronology- An example from the Raft River detachment, Basin and Range, western United States Details Activities (1) Areas (1) Regions (0) Abstract: Application of thermochronological techniques to major normal fault systems can resolve the timing of initiation and duration of extension, rates of motion on detachment faults, timing of ductile mylonite formation and passage of rocks through the crystal-plastic to brittle transition, and multiple events of extensional unroofing. Here we determine

267

Definition: Apex or Salient of Normal Fault | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Apex or Salient of Normal Fault Jump to: navigation, search Dictionary.png Apex or Salient of Normal Fault Normal faults may intersect in the subsurface to form a fault apex or salient. Apices or salients of normal faults account for 3% of structural controls in the Great Basin.[2] View on Wikipedia Wikipedia Definition References ↑ James E. Faulds,Nicholas H. Hinz,Mark F. Coolbaugh,Patricia H. Cashman,Christopher Kratt,Gregory Dering,Joel Edwards,Brett Mayhew,Holly McLachlan. 2011. Assessment of Favorable Structural Settings of Geothermal Systems in the Great Basin, Western USA. In: Transactions. GRC Anual Meeting; 2011/10/23; San Diego, CA. Davis, CA: Geothermal Resources Council; p. 777-783

268

Feb. 11, 2008 Advanced Fault Tolerance Solutions for High Performance Computing 1/47 Advanced Fault Tolerance Solutions  

E-Print Network (OSTI)

Feb. 11, 2008 Advanced Fault Tolerance Solutions for High Performance Computing 1/47 RAS RAS Advanced Fault Tolerance Solutions for High Performance Computing Christian Engelmann Oak Ridge National Solutions for High Performance Computing 2/47 · Nation's largest energy laboratory · Nation's largest

Engelmann, Christian

269

Effects of delaying the operation of a nuclear power plant  

Science Conference Proceedings (OSTI)

This report documents a study of an actual 24-month nuclear power plant licensing delay. A representative utility was chosen for examination. The research was oriented toward determination of the licensing delay's impact on the utility's operating results, ratepayers, and security issues. The methodology utilized to estimate those impacts involved the recursive interaction of a generation costing program to estimate replacement fuel costs and a financial regulatory model to concomitantly determine the impact on the utility, its ratepayers and security issues. The latter model was executed under six alternate scenarios: (1) no delay in the plant's operation; (2) a 24-month delay; (3) a 24-month delay but further assuming all replacement power was generated by coal-fired plants; (4) a 24-month delay assuming all replacement power from oil-fired plants; (5) no delay but assuming the capital cost of the plant was twice as large; and (6) a 24-month delay with the capital cost of the plant twice as large. Three primary conclusions were made. First, under all scenarios, a 24-month delay in operation of the plant has an adverse impact on the utility's internal generation of funds. Second, although electricity rates are not appreciably affected by the delay, the direction of electricity price changes is contingent on the source of fuel used for replacement power. Finally, a 24-month delay has an adverse impact on the indicators used to evaluate the financial soundness of the utility in all cases under consideration.

Hill, L.J.; Rainey, J.A.; Tepel, R.C.; Van Dyke, J.W.

1983-12-01T23:59:59.000Z

270

Phase-flip and amplitude death in time delay systems with delayed feedback  

E-Print Network (OSTI)

We consider a network of delay dynamical systems connected in a ring via unidirectional positive feedback with the delay in coupling being modulated in time. For the specific case of Mackey-Glass systems on the ring topology, we capture the phenomena of amplitude death, synchronization and phase-flip bifurcation in our model as the relevant parameters are tuned. Using linear stability analysis we predict the region of amplitude death in the parameter space and study the nature of transitions between the different states. For a large number of systems in the same dynamical configuration, we observe splay states, mixed splay states and phase locked clusters.

Chiranjit Mitra; G. Ambika; Soumitro Banerjee

2013-12-11T23:59:59.000Z

271

Fundamentals of Delayed Coking Joint Industry Project  

SciTech Connect

Delayed coking evolved steadily over the early to mid 1900s to enable refiners to convert high boiling, residual petroleum fractions to light products such as gasoline. Pound for pound, coking is the most energy intensive of any operation in a modern refinery. Large amounts of energy are required to heat the thick, poor-quality petroleum residuum to the 900 to 950 degrees F required to crack the heavy hydrocarbon molecules into lighter, more valuable products. One common misconception of delayed coking is that the product coke is a disadvantage. Although coke is a low valued (near zero economic value) byproduct, compared to transportation fuels, there is a significant worldwide trade and demand for coke as it is an economical fuel. Coke production has increased steadily over the last ten years, with further increases forecast for the foreseeable future. Current domestic production is near 111,000 tons per day. A major driving force behind this increase is the steady decline in crude quality available to refiners. Crude slates are expected to grow heavier with higher sulfur contents while environmental restrictions are expected to significantly reduce the demand for high-sulfur residual fuel oil. Light sweet crudes will continue to be available and in even greater demand than they are today. Refiners will be faced with the choice of purchasing light sweet crudes at a premium price, or adding bottom of the barrel upgrading capability, through additional new investments, to reduce the production of high-sulfur residual fuel oil and increase the production of low-sulfur distillate fuels. A second disadvantage is that liquid products from cokers frequently are unstable, i.e., they rapidly form gum and sediments. Because of intermediate investment and operating costs, delayed coking has increased in popularity among refiners worldwide. Based on the 2000 Worldwide Refining Survey published in the Oil and Gas, the delayed coking capacity for 101 refineries around the world is 2,937,439 barrels/calendar day. These cokers produce 154,607 tons of coke per day and delayed coking accounts for 88% of the world capacity. The delayed coking charge capacity in the United States is 1,787,860 b/cd. Despite its wide commercial use, only relatively few contractors and refiners are truly knowledgeable in delayed-coking design, so that this process carries with it a ''black art'' connotation. Until recently, the expected yield from cokers was determined by a simple laboratory test on the feedstock. As a result of Tulsa University's prior related research, a process model was developed that with additional work could be used to optimize existing delayed cokers over a wide range of potential feedstocks and operating conditions. The objectives of this research program are to: utilize the current micro, batch and pilot unit facilities at The University of Tulsa to enhance the understanding of the coking process; conduct additional micro and pilot unit tests with new and in-house resids and recycles to make current optimization models more robust; conduct focused kinetic experiments to enhance the furnace tube model and to enhance liquid production while minimizing sulfur in the products; conduct detailed foaming studies to optimize the process and minimize process upsets; quantify the parameters that affect coke morphology; and to utilize the knowledge gained from the experimental and modeling studies to enhance the computer programs developed in the previous JIP for optimization of the coking process. These refined computer models will then be tested against refinery data provided by the member companies. Novel concepts will also be explored for hydrogen sulfide removal of furnace gases as well as gas injection studies to reduce over-cracking. The following deliverables are scheduled from the two projects of the three-year JIP: (1) A novel method for enhancing liquid yields from delayed cokers and data that provide insight as to the optimum temperature to remove hydrogen sulfide from furnace gases. (2) An understanding of what causes foaming in c

Michael Volk Jr; Keith Wisecarver

2005-10-01T23:59:59.000Z

272

Steps toward fault-tolerant quantum chemistry.  

SciTech Connect

Developing quantum chemistry programs on the coming generation of exascale computers will be a difficult task. The programs will need to be fault-tolerant and minimize the use of global operations. This work explores the use a task-based model that uses a data-centric approach to allocate work to different processes as it applies to quantum chemistry. After introducing the key problems that appear when trying to parallelize a complicated quantum chemistry method such as coupled-cluster theory, we discuss the implications of that model as it pertains to the computational kernel of a coupled-cluster program - matrix multiplication. Also, we discuss the extensions that would required to build a full coupled-cluster program using the task-based model. Current programming models for high-performance computing are fault-intolerant and use global operations. Those properties are unsustainable as computers scale to millions of CPUs; instead one must recognize that these systems will be hierarchical in structure, prone to constant faults, and global operations will be infeasible. The FAST-OS HARE project is introducing a scale-free computing model to address these issues. This model is hierarchical and fault-tolerant by design, allows for the clean overlap of computation and communication, reducing the network load, does not require checkpointing, and avoids the complexity of many HPC runtimes. Development of an algorithm within this model requires a change in focus from imperative programming to a data-centric approach. Quantum chemistry (QC) algorithms, in particular electronic structure methods, are an ideal test bed for this computing model. These methods describe the distribution of electrons in a molecule, which determine the properties of the molecule. The computational cost of these methods is high, scaling quartically or higher in the size of the molecule, which is why QC applications are major users of HPC resources. The complexity of these algorithms means that MPI alone is insufficient to achieve parallel scaling; QC developers have been forced to use alternative approaches to achieve scalability and would be receptive to radical shifts in the programming paradigm. Initial work in adapting the simplest QC method, Hartree-Fock, to this the new programming model indicates that the approach is beneficial for QC applications. However, the advantages to being able to scale to exascale computers are greatest for the computationally most expensive algorithms; within QC these are the high-accuracy coupled-cluster (CC) methods. Parallel coupledcluster programs are available, however they are based on the conventional MPI paradigm. Much of the effort is spent handling the complicated data dependencies between the various processors, especially as the size of the problem becomes large. The current paradigm will not survive the move to exascale computers. Here we discuss the initial steps toward designing and implementing a CC method within this model. First, we introduce the general concepts behind a CC method, focusing on the aspects that make these methods difficult to parallelize with conventional techniques. Then we outline what is the computational core of the CC method - a matrix multiply - within the task-based approach that the FAST-OS project is designed to take advantage of. Finally we outline the general setup to implement the simplest CC method in this model, linearized CC doubles (LinCC).

Taube, Andrew Garvin

2010-05-01T23:59:59.000Z

273

Wavelet analysis for gas turbine fault diagnostics  

SciTech Connect

The application of wavelet analysis to diagnosing faults in gas turbines is examined in the present paper. Applying the wavelet transform to time signals obtained from sensors placed on an engine gives information in correspondence to their Fourier transform. Diagnostic techniques based on Fourier analysis of signals can therefore be transposed to the wavelet analysis. In the paper the basic properties of wavelets, in relation to the nature of turbomachinery signals, are discussed. The possibilities for extracting diagnostic information by means of wavelets are examined, by studying the applicability to existing data from vibration, unsteady pressure, and acoustic measurements. Advantages offered, with respect to existing methods based on harmonic analysis, are discussed as well as particular requirements related to practical application.

Aretakis, N.; Mathioudakis, K. [National Technical Univ. of Athens (Greece). Lab. of Thermal Turbomachines

1997-10-01T23:59:59.000Z

274

Self field triggered superconducting fault current limiter  

DOE Patents (OSTI)

A superconducting fault current limiter array with a plurality of superconductor elements arranged in a meanding array having an even number of supconductors parallel to each other and arranged in a plane that is parallel to an odd number of the plurality of superconductors, where the odd number of supconductors are parallel to each other and arranged in a plane that is parallel to the even number of the plurality of superconductors, when viewed from a top view. The even number of superconductors are coupled at the upper end to the upper end of the odd number of superconductors. A plurality of lower shunt coils each coupled to the lower end of each of the even number of superconductors and a plurality of upper shunt coils each coupled to the upper end of each of the odd number of superconductors so as to generate a generally orthoganal uniform magnetic field during quenching using only the magenetic field generated by the superconductors.

Tekletsadik, Kasegn D. (Rexford, NY)

2008-02-19T23:59:59.000Z

275

Fault tolerant hypercube computer system architecture  

SciTech Connect

This patent describes a fault-tolerant multi-processor computer system of the hypercube type. It comprises: a plurality of first computing nodes; a first network of message conducting path means for interconnecting the first computing nodes as a hypercube. The first network providing a path for message transfer between the first computing nodes; a first watch dog node; and, a second network of message conducting path means for directly connecting each of the first computing nodes to the first watch dog node independent from the first network. The second network providing an independent path for test message and reconfiguration affecting transfers between respective ones of the first computing nodes and the first watch dog node.

Madan, H.S.; Chow, E.

1989-09-19T23:59:59.000Z

276

Coherence delay augmented laser beam homogenizer  

DOE Patents (OSTI)

It is an object of the present invention to provide an apparatus that can reduce the apparent coherence length of a laser beam so the beam can be used with an inexpensive homogenizer to produce an output beam with a uniform spatial intensity across its entire cross section. It is a further object of the invention to provide an improved homogenizer with a variable aperture size that is simple and easily made. It is still an additional object of the invention to provide an improved liquid filled homogenizer utilizing total internal reflection for improved efficiency. These, and other objects of the invention are realized by using a ``coherence delay line,`` according to the present invention, in series between a laser and a homogenizer. The coherence delay line is an optical ``line`` that comprises two mirrors, one partially reflecting, and one totally reflecting, arranged so that light incident from the laser first strikes the partially reflecting mirror. A portion of the beam passes through, and a portion is reflected back to the totally reflecting mirror.

Rasmussen, P.; Bernhardt, A.

1991-12-31T23:59:59.000Z

277

Development of Characterization Technology for Fault Zone Hydrology  

SciTech Connect

Several deep trenches were cut, and a number of geophysical surveys were conducted across the Wildcat Fault in the hills east of Berkeley, California. The Wildcat Fault is believed to be a strike-slip fault and a member of the Hayward Fault System, with over 10 km of displacement. So far, three boreholes of ~;; 150m deep have been core-drilled and borehole geophysical logs were conducted. The rocks are extensively sheared and fractured; gouges were observed at several depths and a thick cataclasitic zone was also observed. While confirming some earlier, published conclusions from shallow observations about Wildcat, some unexpected findings were encountered. Preliminary analysis indicates that Wildcat near the field site consists of multiple faults. The hydraulic test data suggest the dual properties of the hydrologic structure of the fault zone. A fourth borehole is planned to penetrate the main fault believed to lie in-between the holes. The main philosophy behind our approach for the hydrologic characterization of such a complex fractured system is to let the system take its own average and monitor a long term behavior instead of collecting a multitude of data at small length and time scales, or at a discrete fracture scale and to ?up-scale,? which is extremely tenuous.

Karasaki, Kenzi; Onishi, Tiemi; Gasperikova, Erika; Goto, Junichi; Tsuchi, Hiroyuki; Miwa, Tadashi; Ueta, Keiichi; Kiho, Kenzo; MIyakawa, Kimio

2010-08-06T23:59:59.000Z

278

High energy arcing fault fires in switchgear equipment : a literature review.  

SciTech Connect

In power generating plants, switchgear provide a means to isolate and de-energize specific electrical components and buses in order to clear downstream faults, perform routine maintenance, and replace necessary electrical equipment. These protective devices may be categorized by the insulating medium, such as air or oil, and are typically specified by voltage classes, i.e. low, medium, and high voltage. Given their high energy content, catastrophic failure of switchgear by means of a high energy arcing fault (HEAF) may occur. An incident such as this may lead to an explosion and fire within the switchgear, directly impact adjacent components, and possibly render dependent electrical equipment inoperable. Historically, HEAF events have been poorly documented and discussed in little detail. Recent incidents involving switchgear components at nuclear power plants, however, were scrupulously investigated. The phenomena itself is only understood on a very elementary level from preliminary experiments and theories; though many have argued that these early experiments were inaccurate due to primitive instrumentation or poorly justified methodologies and thus require re-evaluation. Within the past two decades, however, there has been a resurgence of research that analyzes previous work and modern technology. Developing a greater understanding of the HEAF phenomena, in particular the affects on switchgear equipment and other associated switching components, would allow power generating industries to minimize and possibly prevent future occurrences, thereby reducing costs associated with repair and downtime. This report presents the findings of a literature review focused on arc fault studies for electrical switching equipment. The specific objective of this review was to assess the availability of the types of information needed to support development of improved treatment methods in fire Probabilistic Risk Assessment (PRA) for nuclear power plant applications.

Nowlen, Steven Patrick; Brown, Jason W.; Wyant, Francis John

2008-10-01T23:59:59.000Z

279

Microsoft Word - CX-ChehalisSubstationTreeClearingFY13_WEB.docx  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

, 2013 REPLY TO ATTN OF: KEPR-4 SUBJECT: Environmental Clearance Memorandum Brian Brady Project Forester - TERS-3 Proposed Action: Tree clearing at Bonneville Power...

280

Time delay for the gravitational lens system B0218+357  

E-Print Network (OSTI)

Measurement of the time delay between multiple images of a gravitational lens system is potentially an accurate method of determining the Hubble constant over cosmological distances. One of the most promising candidates for an application of this technique is the system B0218+357 which was found in the Jodrell Bank/VLA Astrometric Survey (JVAS). This system consists of two images of a compact radio source, separated by 335 milliarcsec, and an Einstein ring which can provide a strong constraint on the mass distribution in the lens. We present here the results of a three-month VLA monitoring campaign at two frequencies. The data are of high quality and both images show clear variations in total flux density, percentage polarization and polarization position angle at both frequencies. The time delay between the variations in the two images has been calculated using a chi-squared minimization to be 10.5+/-0.4 days at 95 per cent confidence, with the error being derived from Monte-Carlo simulations of the light curves. Although mass modelling of the system is at a preliminary stage, taking the lensing galaxy to be a singular isothermal ellipsoid and using the new value for the time delay gives a value for the Hubble constant of 69+13/-19 km/s/Mpc, again at 95 per cent confidence.

A. D. Biggs; I. W. A. Browne; P. Helbig; L. V. E. Koopmans; P. N. Wilkinson; R. A. Perley

1998-11-18T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION WITHIN  

Open Energy Info (EERE)

MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION WITHIN MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION WITHIN THE COSO GETHERMAL FIELD, CALIFORNIA Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: MICRO-SEISMICITY, FAULT STRUCTURE AND HYDRAULIC COMPARTMENTALIZATION WITHIN THE COSO GETHERMAL FIELD, CALIFORNIA Details Activities (1) Areas (1) Regions (0) Abstract: High precision earthquake locations and subsurface velocity structure provide potential insights into fracture system geometry, fluid conduits and fluid compartmentalization critical to geothermal reservoir management. We analyze 16 years of seismicity to improve hypocentral locations and simultaneously invert for the seismic velocity structure within the Coso Geothermal Field (CGF). The CGF has been continuously

282

Soft Computing Application in Fault Detection of Induction Motor  

Science Conference Proceedings (OSTI)

The paper investigates the effectiveness of different patter classifier like Feed Forward Back Propagation (FFBPN), Radial Basis Function (RBF) and Support Vector Machine (SVM) for detection of bearing faults in Induction Motor. The steady state motor current with Park's Transformation has been used for discrimination of inner race and outer race bearing defects. The RBF neural network shows very encouraging results for multi-class classification problems and is hoped to set up a base for incipient fault detection of induction motor. SVM is also found to be a very good fault classifier which is highly competitive with RBF.

Konar, P.; Puhan, P. S.; Chattopadhyay, P. Dr. [Electrical Engineering Department, BESUS, Shibpur (India)

2010-10-26T23:59:59.000Z

283

A core-based assessment of the spatial relationship of small faults associated with a basement-controlled, large normal fault in the Hickory Sandstone  

E-Print Network (OSTI)

This research characterized a system of small faults (displacement < 0.3 m) in seven closely-spaced continuous 2.4 inch (6.1 cm) diameter cores. Cores were obtained from central Texas, on the western edge of the Llano Uplift. Cores penetrate a dip-slip dominant, normal fault (Nobles Fault) with 18.3 m (60 ft) of stratigraphic throw. The spatial, geometric and kinematic attributes of small faults within the Nobles Fault system were characterized to explore potential cause-and-effect relationships. To quantify spatial distributions, a "density" measure based on individual small fault magnitude was utilized. Approximately half of the small faults in the core possessed no discernible offset markers; thus displacement amount for these faults could not be measured directly. Using a nonparametric method in which an alternating conditional expectation determined optimal transformations for the data, a statistically significant empirical correlation was established for faults with measurable gouge thickness, displacement, protolith mean grain size and sorting. Gouge thickness of small faults was found to be dependant upon the displacement amount of the small fault and the textural characteristics of the host protolith. The role of protolith lithology, proximity to crystalline basement, and structural position relative to the Nobles Fault system were examined to explain observed ubiquitous spatial distribution of small faults. Small faults were found to occur in clusters and the number of faults per foot only weakly correlates to the cumulative displacement of the corresponding faults. The amount of mudstone present is the dominant factor controlling small fault formation. Intervals with only minor quantities of mudstone have the largest number of faults per foot as well as largest associated cumulative displacement per foot. Frequency of occurrence of small faults near the basement is greater when compared to similar lithologies higher in the core. Intensity of small faults do not universally increase with proximity to large faults. To observe an increase in small faults, it is necessary to use a mean global cumulative displacement approach. Zones of greater than average cumulative displacement of small faults in close proximity to large faults were observed in zones that are compatible with faultfault interaction.

Graff, Mitchell C

2006-08-01T23:59:59.000Z

284

A Systematic Stochastic Petri Net Based Methodology for Transformer Fault Diagnosis and Repair Actions  

Science Conference Proceedings (OSTI)

Transformer fault diagnosis and repair is a complex task that includes many possible types of faults and demands special trained personnel. Moreover, the minimization of the time needed for transformer fault diagnosis and repair is an important task ... Keywords: power system reliability, stochastic petri nets, transformer fault diagnosis

P. S. Georgilakis; J. A. Katsigiannis; K. P. Valavanis; A. T. Souflaris

2006-02-01T23:59:59.000Z

285

Analysis of the growth of strike-slip faults using effective medium theory  

SciTech Connect

Increases in the dimensions of strike-slip faults including fault length, thickness of fault rock and the surrounding damage zone collectively provide quantitative definition of fault growth and are commonly measured in terms of the maximum fault slip. The field observations indicate that a common mechanism for fault growth in the brittle upper crust is fault lengthening by linkage and coalescence of neighboring fault segments or strands, and fault rock-zone widening into highly fractured inner damage zone via cataclastic deformation. The most important underlying mechanical reason in both cases is prior weakening of the rocks surrounding a fault's core and between neighboring fault segments by faulting-related fractures. In this paper, using field observations together with effective medium models, we analyze the reduction in the effective elastic properties of rock in terms of density of the fault-related brittle fractures and fracture intersection angles controlled primarily by the splay angles. Fracture densities or equivalent fracture spacing values corresponding to the vanishing Young's, shear, and quasi-pure shear moduli were obtained by extrapolation from the calculated range of these parameters. The fracture densities or the equivalent spacing values obtained using this method compare well with the field data measured along scan lines across the faults in the study area. These findings should be helpful for a better understanding of the fracture density/spacing distribution around faults and the transition from discrete fracturing to cataclastic deformation associated with fault growth and the related instabilities.

Aydin, A.; Berryman, J.G.

2009-10-15T23:59:59.000Z

286

Fault Detection and Isolation of a Cryogenic Rocket Engine Combustion Chamber Using a Parity Space Approach  

Science Conference Proceedings (OSTI)

his paper presents a parity space (PS) approach for fault detection and isolation (FDI) of a cryogenic rocket engine combustion chamber. Nominal and non-nominal simulation data for three engine set points have been provided. The PS approach uses three ... Keywords: Fault Detection, Fault Isolation, Fault Diagnosis, Parity Space, Rocket Engine

Paul van Gelder; André Bos

2009-07-01T23:59:59.000Z

287

Fault-based test suite prioritization for specification-based testing  

Science Conference Proceedings (OSTI)

Context: Existing test suite prioritization techniques usually rely on code coverage information or historical execution data that serve as indicators for estimating the fault-detecting ability of test cases. Such indicators are primarily empirical in ... Keywords: Fault class hierarchy, Fault-based prioritization, Fault-based testing, Software testing, Specification-based testing, Test suite prioritization

Yuen Tak Yu; Man Fai Lau

2012-02-01T23:59:59.000Z

288

A Power Transmission Line Fault Distance Estimation VLSI Chip: Design and Defect Tolerance  

Science Conference Proceedings (OSTI)

This paper presents a system-on-a-chip for fault detection and fault-distance-estimation for power transmission lines in the smart grid. Toward this goal we have designed and fabricated three chips: PGS4, PGS5 and PGS6, each successively more advanced ... Keywords: Smart grid, fault distance, arcing fault, system on a chip, defect tolerance, Radojevic algorithm.

E. MacLean; V. K. Jain

2011-10-01T23:59:59.000Z

289

Ice Climbing in Clear Creek Canyon A climbing trip report by Glenn Murray  

E-Print Network (OSTI)

Ice Climbing in Clear Creek Canyon A climbing trip report by Glenn Murray SUMMARY: I climb ice in to ask about local climbing. The guys there told me there was ice nearby, in Clear Creek Canyon. I. Four pitches? Five? It was time to find a partner. The only ice climber I knew in Denver was a friend

290

Multi-objective reactive power market clearing in competitive electricity market using HFMOEA  

Science Conference Proceedings (OSTI)

This paper presents an application of a hybrid fuzzy multi-objective evolutionary algorithm (HFMOEA) for solving a highly constraint, mixed integer type, complex multi-objective reactive power market clearing (RPMC) problem for the competitive electricity ... Keywords: Competitive electricity market, Fuzzy logic controller, Hybrid evolutionary algorithm, Multi-objective optimization, Pareto-optimal front, Reactive power market clearing

Ashish Saini; Amit Saraswat

2013-04-01T23:59:59.000Z

291

Sensitivity of Clear-Sky Diffuse Radiation to In Situ Aerosol Scattering Parameters  

NLE Websites -- All DOE Office Websites (Extended Search)

Sensitivity of Clear-Sky Diffuse Radiation to In Situ Sensitivity of Clear-Sky Diffuse Radiation to In Situ Aerosol Scattering Parameters P. J. Ricchiazzi and C. Gautier University of California Santa Barbara, California Introduction Recent studies of clear-sky radiation indicate that current radiative transfer (RT) models underestimate atmospheric absorption when standard aerosol properties are used. This so-called clear-sky anomaly is manifested in predicted levels of diffuse radiation significantly below those observed at Southern Great Plains (SGP) and other sites in the continental United States (e.g., Halthore et al. 1998 GRL). Other observations at pristine sites do not show a discrepancy (Barnard and Powell 2001, 2001; Kato et al. 1997; Halthore 1998). These results may indicate that the clear-sky anomaly is only observed at sites

292

U-243: libvirt virTypedParameterArrayClear() Memory Access Error Lets  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

3: libvirt virTypedParameterArrayClear() Memory Access Error 3: libvirt virTypedParameterArrayClear() Memory Access Error Lets Remote Users Deny Service U-243: libvirt virTypedParameterArrayClear() Memory Access Error Lets Remote Users Deny Service August 24, 2012 - 7:00am Addthis PROBLEM: libvirt virTypedParameterArrayClear() Memory Access Error Lets Remote Users Deny Service PLATFORM: Version(s): 0.9.13 and prior ABSTRACT: A vulnerability was reported in libvirt. reference LINKS: libvirt SecurityTracker Alert ID: 1027437 Secunia Advisory SA50118 Bugtraq ID: 54748 CVE-2012-3445 IMPACT ASSESSMENT: Medium Discussion A remote user can send a specially crafted RPC call with the number of parameters set to zero to libvirtd to trigger a memory access error in virTypedParameterArrayClear() and cause the target service to crash. Impact:

293

Ground Gravity Survey At Clear Lake Area (Skokan, 1993) | Open Energy  

Open Energy Info (EERE)

Ground Gravity Survey At Clear Lake Area (Skokan, 1993) Ground Gravity Survey At Clear Lake Area (Skokan, 1993) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Ground Gravity Survey At Clear Lake Area (Skokan, 1993) Exploration Activity Details Location Clear Lake Area Exploration Technique Ground Gravity Survey Activity Date Usefulness useful DOE-funding Unknown Notes A detailed gravity survey (Isherwood, 1975) was undertaken as a follow-up to a regional gravity survey of the area in order to detail a low in the Clear Lake volcanics. The low (Fig. 5 ) was thought to be caused by an intrusion of molten rock which would be mass deficient. Modeling and interpretation indicated a+K139 chamber-like feature with a radius of approximately 7 km within 7-8 km of the surface. References

294

Direct-Current Resistivity At Clear Lake Area (Skokan, 1993) | Open Energy  

Open Energy Info (EERE)

Clear Lake Area (Skokan, 1993) Clear Lake Area (Skokan, 1993) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Direct-Current Resistivity At Clear Lake Area (Skokan, 1993) Exploration Activity Details Location Clear Lake Area Exploration Technique Direct-Current Resistivity Survey Activity Date Usefulness useful DOE-funding Unknown Notes Several direct-current, bipole-dipole surveys were carried out in the area. These field measurements (Rapolla and Keller, 1984) were combined by spatially averaging apparent resistivities on a one kilometer grid ( Fig. 6 ). The authors felt that local geologic noise could be reduced and large-scale features would be emphasized by this averaging. The most significant feature which resulted was a clear electrical signature of the

295

Delayed Radiation-Induced Vasculitic Leukoencephalopathy  

SciTech Connect

Purpose: Recently, single-fraction, high-dosed focused radiation therapy such as that administered by Gamma Knife radiosurgery has been used increasingly for the treatment of metastatic brain cancer. Radiation therapy to the brain can cause delayed leukoencephalopathy, which carries its own significant morbidity and mortality. While radiosurgery-induced leukoencephalopathy is known to be clinically different from that following fractionated radiation, pathological differences are not well characterized. In this study, we aimed to integrate novel radiographic and histopathologic observations to gain a conceptual understanding of radiosurgery-induced leukoencephalopathy. Methods and Materials: We examined resected tissues of 10 patients treated at Yale New Haven Hospital between January 1, 2009, and June 30, 2010, for brain metastases that had been previously treated with Gamma Knife radiosurgery, who subsequently required surgical management of a symptomatic regrowing lesion. None of the patients showed pathological evidence of tumor recurrence. Clinical and magnetic resonance imaging data for each of the 10 patients were then studied retrospectively. Results: We provide evidence to show that radiosurgery-induced leukoencephalopathy may present as an advancing process that extends beyond the original high-dose radiation field. Neuropathologic examination of the resected tissue revealed traditionally known leukoencephalopathic changes including demyelination, coagulation necrosis, and vascular sclerosis. Unexpectedly, small and medium-sized vessels revealed transmural T-cell infiltration indicative of active vasculitis. Conclusions: We propose that the presence of a vasculitic component in association with radiation-induced leukoencephalopathy may facilitate the progressive nature of the condition. It may also explain the resemblance of delayed leukoencephalopathy with recurring tumor on virtually all imaging modalities used for posttreatment follow-up.

Rauch, Philipp J. [Departments of Pathology and Neurosurgery, Yale University School of Medicine, New Haven, Connecticut (United States); Faculty of Medicine, University of Heidelberg, Heidelberg (Germany); Park, Henry S. [Departments of Pathology and Neurosurgery, Yale University School of Medicine, New Haven, Connecticut (United States); Knisely, Jonathan P.S. [Department of Radiation Medicine, North Shore University Hospital, Manhasset, New York (United States); Chiang, Veronica L. [Departments of Pathology and Neurosurgery, Yale University School of Medicine, New Haven, Connecticut (United States); Vortmeyer, Alexander O., E-mail: alexander.vortmeyer@yale.edu [Departments of Pathology and Neurosurgery, Yale University School of Medicine, New Haven, Connecticut (United States)

2012-05-01T23:59:59.000Z

296

Recency of Faulting and Neotectonic Framework in the Dixie Valley  

Open Energy Info (EERE)

of Faulting and Neotectonic Framework in the Dixie Valley of Faulting and Neotectonic Framework in the Dixie Valley Geothermal Field and Other Geothermal Fields of the Basin and Range Jump to: navigation, search OpenEI Reference LibraryAdd to library Report: Recency of Faulting and Neotectonic Framework in the Dixie Valley Geothermal Field and Other Geothermal Fields of the Basin and Range Abstract We studied the role that earthquake faults play in redistributing stresses within in the earths crust near geothermal fields. The geographic foci of our study were the sites of geothermal plants in Dixie Valley, Beowawe, and Bradys Hot Springs, Nevada. Our initial results show that the past history of earthquakes has redistributed stresses at these 3 sites in a manner to open and maintain fluid pathways critical for geothermal development. The

297

Aksaray And Ecemis Faults - Diapiric Salt Relationships- Relevance To The  

Open Energy Info (EERE)

Aksaray And Ecemis Faults - Diapiric Salt Relationships- Relevance To The Aksaray And Ecemis Faults - Diapiric Salt Relationships- Relevance To The Hydrocarbon Exploration In The Tuz Golu (Salt Lake) Basin, Central Anatolia, Turkey Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Aksaray And Ecemis Faults - Diapiric Salt Relationships- Relevance To The Hydrocarbon Exploration In The Tuz Golu (Salt Lake) Basin, Central Anatolia, Turkey Details Activities (0) Areas (0) Regions (0) Abstract: Due to activitiy of the Aksaray and Ecemis Faults, volcanic intrusion and westward movement of the Anatolian plate, diapiric salt structures were occurred in the Tuz Golu (Salt Lake) basin in central Anatolia, Turkey. With the collisions of the Arabian and Anatolian plates during the late Cretaceous and Miocene times, prominent ophiolitic

298

Recency Of Faulting And Neotechtonic Framework In The Dixie Valley  

Open Energy Info (EERE)

Of Faulting And Neotechtonic Framework In The Dixie Valley Of Faulting And Neotechtonic Framework In The Dixie Valley Geothermal Field And Other Geothermal Fields Of The Basin And Range Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Recency Of Faulting And Neotechtonic Framework In The Dixie Valley Geothermal Field And Other Geothermal Fields Of The Basin And Range Details Activities (6) Areas (3) Regions (0) Abstract: We studied the role that earthquake faults play in redistributing stresses within in the earths crust near geothermal fields. The geographic foci of our study were the sites of geothermal plants in Dixie Valley, Beowawe, and Bradys Hot Springs, Nevada. Our initial results show that the past history of earthquakes has redistributed stresses at these 3 sites in a manner to open and maintain fluid pathways critical for geothermal

299

Understanding Fault Characteristics And Sediment Depth For Geothermal  

Open Energy Info (EERE)

Understanding Fault Characteristics And Sediment Depth For Geothermal Understanding Fault Characteristics And Sediment Depth For Geothermal Exploration Using 3D Gravity Inversion In Walker Valley, Nevada Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Understanding Fault Characteristics And Sediment Depth For Geothermal Exploration Using 3D Gravity Inversion In Walker Valley, Nevada Details Activities (2) Areas (1) Regions (0) Abstract: The Southern Walker Lake Basin, situated in the Walker Lake structural domain, consists of primarily E-W directed extension along N-NNW striking normal faults. Water well drilling on the eastern slopes of the Wassuk Range, west of the city of Hawthorne, Nevada showed elevated temperatures. Two recent drill holes reaching downhole depths of more than 4000 ft give some insight to the geologic picture, but more information

300

Characteristics of Wind Turbines Under Normal and Fault Conditions: Preprint  

SciTech Connect

This paper investigates the characteristics of a variable-speed wind turbine connected to a stiff or weak grid under normal and fault conditions and the role of reactive power compensation.

Muljadi, E.; Butterfield, C. P.; Parsons, B.; Ellis, A.

2007-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

High-Resolution Aeromagnetic Survey to Image Shallow Faults,...  

Open Energy Info (EERE)

Number 02-384 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for High-Resolution Aeromagnetic Survey to Image Shallow Faults, Dixie Valley...

302

Non-intrusive fault detection in reciprocating compressors  

E-Print Network (OSTI)

This thesis presents a set of techniques for non-intrusive sensing and fault detection in reciprocating compressors driven by induction motors. The procedures developed here are "non-intrusive" because they rely only on ...

Schantz, Christopher James

2011-01-01T23:59:59.000Z

303

Discretized streams: fault-tolerant streaming computation at scale  

Science Conference Proceedings (OSTI)

Many "big data" applications must act on data in real time. Running these applications at ever-larger scales requires parallel platforms that automatically handle faults and stragglers. Unfortunately, current distributed stream processing models provide ...

Matei Zaharia, Tathagata Das, Haoyuan Li, Timothy Hunter, Scott Shenker, Ion Stoica

2013-11-01T23:59:59.000Z

304

CAPRI: A Common Architecture for Distributed Probabilistic Internet Fault Diagnosis  

E-Print Network (OSTI)

This thesis presents a new approach to root cause localization and fault diagnosis in the Internet based on a Common Architecture for Probabilistic Reasoning in the Internet (CAPRI) in which distributed, heterogeneous ...

Lee, George J.

2007-06-04T23:59:59.000Z

305

Dating of major normal fault systems using thermochronology-...  

Open Energy Info (EERE)

River detachment fault and shear zone by study of spatial gradients in 40Ar39 A and fission track cooling ages of footwall rocks and cooling histories and by comparison of...

306

Fusing strategies for the dual-voltage fault  

E-Print Network (OSTI)

This thesis focuses on the 42V - 14V fault in a dual voltage system and discusses the possibility of effective fusing. A simple model for the system had been created from technical documentation. Based on the model and the ...

Shrivastava, Rupam, 1981-

2005-01-01T23:59:59.000Z

307

Local discriminant bases in machine fault diagnosis using vibration signals  

Science Conference Proceedings (OSTI)

Wavelets and local discriminant bases (LDB) selection algorithm is applied to vibration signals in a single-cylinder spark ignition engine for feature extraction and fault classification. LDB selects a complete orthogonal basis from a wavelet packet ...

R. Tafreshi; F. Sassani; H. Ahmadi; G. Dumont

2005-04-01T23:59:59.000Z

308

Adaptive Control and Fault Detection of HVAC Equipment in Commercial...  

NLE Websites -- All DOE Office Websites (Extended Search)

Adaptive Control and Fault Detection of HVAC Equipment in Commercial Buildings Speaker(s): John Seem Date: February 27, 2002 - 12:00pm Location: Bldg. 90 Seminar HostPoint of...

309

Development of Hydrologic Characterization Technology of Fault Zones  

E-Print Network (OSTI)

one example being Dixie Valley, Nevada, an active normalrock at various sites: Dixie Valley, Nevada; Wasatch, Utah;20 m in parts of the Dixie Valley and Wasatch fault zones.

Karasaki, Kenzi

2009-01-01T23:59:59.000Z

310

Microgrid Fault Protection Based on Symmetrical and Differential Current Components  

E-Print Network (OSTI)

Microgrid Fault Protection Based on Symmetrical and Differential Current Components Prepared.........................................................................................8 2. AEP CERTS MICROGRID .........................................................................9 ........................................................................67 #12;3 Index of Figures Figure 1: Schematic representation of the AEP CERTS microgrid

311

Fault Detection and Isolation in Low-Voltage DC Distribution ...  

A University of Colorado research team led by Jae-Do Park has developed a fault detection and isolation scheme for a low-voltage DC-bus microgrid system, ...

312

Understanding Fault Characteristics And Sediment Depth For Geothermal...  

Open Energy Info (EERE)

of primarily E-W directed extension along N-NNW striking normal faults. Water well drilling on the eastern slopes of the Wassuk Range, west of the city of Hawthorne, Nevada...

313

Dynamic transient fault detection and recovery for embedded processor datapaths  

Science Conference Proceedings (OSTI)

As microprocessors continue to evolve and grow in functionality, the use of smaller nanometer technology scaling coupled with high clock frequencies and exponentially increasing transistor counts dramatically increases the susceptibility of transient ... Keywords: datapath, embedded, fault tolerance, reliability, soft errors

Garo Bournoutian; Alex Orailoglu

2012-10-01T23:59:59.000Z

314

A Fault Detection and Diagnosis Method for HVAC Systems  

NLE Websites -- All DOE Office Websites (Extended Search)

A Fault Detection and Diagnosis Method for HVAC Systems A Fault Detection and Diagnosis Method for HVAC Systems Speaker(s): Peng Xu Date: December 2, 2002 - 12:00pm Location: Bldg. 90 There is a growing consensus that most buildings do not perform as well as intended and that faults in HVAC systems are widespread in commercial buildings. An automated fault detection and diagnosis tool for HVAC systems is being developed, based on an integrated, life-cycle, approach to commissioning and performance monitoring. The tool uses component-level HVAC equipment models implemented in the SPARK equation-based simulation environment. The models are configured using design information and component manufacturers' data and then fine-tuned to match the actual performance of the equipment by using data measured during functional tests

315

Fault Mapping At Coso Geothermal Area (1980) | Open Energy Information  

Open Energy Info (EERE)

Fault Mapping At Coso Geothermal Area (1980) Fault Mapping At Coso Geothermal Area (1980) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Fault Mapping At Coso Geothermal Area (1980) Exploration Activity Details Location Coso Geothermal Area Exploration Technique Fault Mapping Activity Date 1980 Usefulness useful DOE-funding Unknown Exploration Basis To determine the Late Cenozoic volcanism, geochronology, and structure of the Coso Range Notes This system apparently is heated by a reservoir of silicic magma at greater than or equal to 8-km depth, itself produced and sustained through partial melting of crustal rocks by thermal energy contained in mantle-derived basaltic magma that intrudes the crust in repsonse to lithospheric extension. References Duffield, W.A.; Bacon, C.R.; Dalrymple, G.B. (10 May 1980) Late

316

Microsecond delays on non-real time operating systems  

SciTech Connect

We have developed microsecond timing and profiling software that runs on standard Windows and Linux based operating systems. This software is orders of magnitudes better than most of the standard native functions in wide use. Our software libraries calibrate RDTSC in microseconds or seconds to provide two different types of delays: a ''Guaranteed Minimum'' and a precision ''Long Delay'', which releases to the kernel. Both return profiling information of the actual delay.

Angstadt, R.; Estrada, J.; Diehl, H.T.; Flaugher, B.; Johnson, M.; /Fermilab

2007-05-01T23:59:59.000Z

317

Transmission Line Fault Inspection and Root Cause Analysis Approach  

Science Conference Proceedings (OSTI)

Transmission lines are designed to transfer electric power from source locations, sometimes over great distances through different terrains and exposed to several influences. These challenges include faulty equipment, misoperation, human errors, and aging of components, as well as meteorological and ecological factors such as storms, lightning, and the effects of plants and animals. A number of techniques are currently used to isolate the faulting line and provide the fault position. Sustained or ...

2013-12-20T23:59:59.000Z

318

The application of satellite time references to HVDC fault location  

Science Conference Proceedings (OSTI)

An HVdc fault location scheme is described which relies on very precise detection of the time of arrival of fault created surges at both ends of the line. Such detection is achieved by a very accurate data acquisition and processing system combined with the time reference signals provided by a global positioning system receiver. Extensive digital simulation is carried out to determine the voltage and current waveforms, to identify the main sources of error and suggest possible compensation techniques.

Dewe, M.B.; Sankar, S.; Arrillaga, J. (Univ. of Canterbury, Christchurch (New Zealand))

1993-07-01T23:59:59.000Z

319

Transmission Line Fault Inspection and Root Cause Analysis Approach  

Science Conference Proceedings (OSTI)

Transmission lines are designed to transfer electric power from source locations sometimes over great distances through different terrains and exposed to several influences. These challenges include faulty equipment, misoperation, human errors, and aging of components, and meteorological and ecological factors such as storms, lightning, and the effects of plants and animals. A number of techniques are currently used to isolate the faulting line and provide the fault position. Sustained or permanent ...

2012-12-20T23:59:59.000Z

320

Predicting Ignition Delay for Gas Turbine Fuel Flexibility  

NLE Websites -- All DOE Office Websites (Extended Search)

Predicting Ignition Delay for Gas Turbine Fuel Flexibility 15 m * Low emission combustion systems have been carefully optimized for natural gas * Future fuel diversity (including...

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Delayed Start or Cancellation of Business Hours | Argonne National...  

NLE Websites -- All DOE Office Websites (Extended Search)

Twitter Delayed Start or Cancellation of Business Hours Winter Road Closings Winter Weather FAQs Westgate Alternate Routes Reporting IllegalUnethical Activity Working Remotely...

322

Algorithmic Based Fault Tolerance Applied to High Performance Computing  

E-Print Network (OSTI)

We present a new approach to fault tolerance for High Performance Computing system. Our approach is based on a careful adaptation of the Algorithmic Based Fault Tolerance technique (Huang and Abraham, 1984) to the need of parallel distributed computation. We obtain a strongly scalable mechanism for fault tolerance. We can also detect and correct errors (bit-flip) on the fly of a computation. To assess the viability of our approach, we have developed a fault tolerant matrix-matrix multiplication subroutine and we propose some models to predict its running time. Our parallel fault-tolerant matrix-matrix multiplication scores 1.4 TFLOPS on 484 processors (cluster jacquard.nersc.gov) and returns a correct result while one process failure has happened. This represents 65% of the machine peak efficiency and less than 12% overhead with respect to the fastest failure-free implementation. We predict (and have observed) that, as we increase the processor count, the overhead of the fault tolerance drops significantly.

Bosilca, George; Dongarra, Jack; Langou, Julien

2008-01-01T23:59:59.000Z

323

Designing fault-tolerant manipulators: How many degrees of freedom?  

SciTech Connect

One of the most important parameters to consider when designing a manipulator is the number of degrees of freedom (DOFs). This article focuses on the question: How many DOFs are necessary and sufficient for fault tolerance, and how should these DOFs be distributed along the length of the manipulator? A manipulator is fault tolerant if it can complete its task even when one of its joints fails and is immobilized. The number of DOFs needed for fault tolerance strongly depends on the knowledge available about the task. In this article, two approaches are explored. First, for the design of a general purpose fault-tolerant manipulator, it is assumed that neither the exact task trajectory nor the redundancy resolution algorithm are known a priori and the manipulator has no joint limits. In this case, two redundant DOFs are necessary and sufficient to sustain one joint failure, as is demonstrated in two design templates for spatial fault-tolerant manipulators. In this second approach, both the Cartesian task path and the redundancy resolution algorithm are assumed to be known. The design of such a task-specific fault-tolerant manipulator requires only one degree of redundancy. 22 refs., 11 figs., 2 tabs.

Paredis, C.J.J.; Khosla, P.K. [Carnegie Mellon Univ., Pittsburgh, PA (United States)

1996-12-01T23:59:59.000Z

324

Fault-tolerance for exascale systems.  

Science Conference Proceedings (OSTI)

Periodic, coordinated, checkpointing to disk is the most prevalent fault tolerance method used in modern large-scale, capability class, high-performance computing (HPC) systems. Previous work has shown that as the system grows in size, the inherent synchronization of coordinated checkpoint/restart (CR) limits application scalability; at large node counts the application spends most of its time checkpointing instead of executing useful work. Furthermore, a single component failure forces an application restart from the last correct checkpoint. Suggested alternatives to coordinated CR include uncoordinated CR with message logging, redundant computation, and RAID-inspired, in-memory distributed checkpointing schemes. Each of these alternatives have differing overheads that are dependent on both the scale and communication characteristics of the application. In this work, using the Structural Simulation Toolkit (SST) simulator, we compare the performance characteristics of each of these resilience methods for a number of HPC application patterns on a number of proposed exascale machines. The result of this work provides valuable guidance on the most efficient resilience methods for exascale systems.

Riesen, Rolf E.; Varela, Maria Ruiz (University of Delaware); Ferreira, Kurt Brian

2010-08-01T23:59:59.000Z

325

Palaeoseismology of the North Anatolian Fault near the Marmara Sea: implications for fault segmentation and seismic hazard  

E-Print Network (OSTI)

Diego, CA 92182, USA 2 Institute of Geological and Nuclear Sciences, PO Box 30-368, Lower Hutt, New fault to the city of Istanbul, one of the largest cities in the Middle East. Across the 1912 rupture

Klinger, Yann

326

Evaluation of faulting characteristics and ground acceleration associated with recent movement along the Meers Fault, Southwestern Oklahoma  

E-Print Network (OSTI)

Recent studies have shown that a 27 km section of the Meers Fault was reactivated during Holocene time. Although these studies have proven the occurrence of recent fault activity, many basic characteristics of the faulting remain unresolved, For instance, the issue of whether recent deformation was dominantly vertical or laterally oriented is still a source of disagreement among many researchers. The number of events associated with recent movement is another area of uncertainty, with I to 4 events being cited as responsible for the Meers Fault scarp. Earthquakes of magnitude 7 to 8 occurring in conjunction with recent reactivation of the fault have been calculated. However, evidence found within the Wichita Mountains just south of the fault exhibits strong evidence against large recent earthquake events. Investigation of stream channel pathways where they cross the fault revealed that many streams previously identified as left-laterally offset are instead left-laterally deflected by folding on the upthrown block. These streams are in every case deflected much farther than any true lateral displacement recognized on the fault. Inclusion of the streams in past studies has apparently contributed to over-estimation of the recent component of left-lateral displacement. Exposure development into the Meers Fault scarp revealed deformed units and colluvial wedges that indicate 4 recent movements produced a total of 1.46 m of brittle deformation and another 1.04 m of monoclinal warping. A previously unidentified conglomerate uncovered in the exposure exhibits evidence for a lateral component of displacement during possible Late Pleistocene deformation. subsequent events identified in the exposure. Reconnaissance of the Wichita Mountains granitic terrain just south of the Meers Fault resulted in the identification of 27 precariously balanced rocks (tors). These geomorphic features lie within 18 km of the fault and have apparently been sitting in their present positions on the order of thousands of years. Quantitative analysis of the tors indicates that most could not have withstood the ground accelerations generated by magnitude 7 or above earthquakes estimated to have occurred with recent deformation.

Burrell, Richard Dennis

1997-01-01T23:59:59.000Z

327

Original article: An efficient, simplified multiple-coupled circuit model of the induction motor aimed to simulate different types of stator faults  

Science Conference Proceedings (OSTI)

This paper proposes an original simplified model aimed to simulate, an easy way, inter turns short circuit fault, phase to phase fault and phase to ground fault. In this model, the stator is considered as six magnetically coupled windings and the rotor ... Keywords: Fault diagnosis, Inter turns short circuit fault, Phase to ground fault, Phase to phase fault, Symmetrical components

M. Bouzid, G. Champenois

2013-04-01T23:59:59.000Z

328

Isotopic Analysis At Clear Lake Area (Thompson, Et Al., 1992) | Open Energy  

Open Energy Info (EERE)

Clear Lake Area (Thompson, Et Al., 1992) Clear Lake Area (Thompson, Et Al., 1992) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Isotopic Analysis- Fluid At Clear Lake Area (Thompson, Et Al., 1992) Exploration Activity Details Location Clear Lake Area Exploration Technique Isotopic Analysis- Fluid Activity Date Usefulness useful DOE-funding Unknown Notes Deuterium and oxygen- 18 values of the thermal waters indicate that they recharged locally and became K271enriched in oxygen-18 by exchange with rock. The isotopic composition of the waters indicates that they are of meteoric origin. A plot of deuterium versus chloride indicates that as the chloride concentration increases, the deuterium composition remains essentially constant. A plot of oxygen-18 versus chloride shows that the

329

Geothermometry At Clear Lake Area (Thompson, Et Al., 1992) | Open Energy  

Open Energy Info (EERE)

Clear Lake Area (Thompson, Et Al., 1992) Clear Lake Area (Thompson, Et Al., 1992) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermometry At Clear Lake Area (Thompson, Et Al., 1992) Exploration Activity Details Location Clear Lake Area Exploration Technique Geothermometry Activity Date Usefulness useful DOE-funding Unknown Notes Based on the above discussion, we favor a model in which thermal water rises somewhere between Howard and Seigler Springs. At Howard Springs we see evidence for the most representative deep thermal water because the C1 is elevated (highest measured C1 concentrations occur at Howard Springs). Moreover, the Na-Li, Na-K and Na-K-Ca geothermometers suggest temperatures greater than 240 degrees C. References J. M. Thompson, R. H. Mariner, L. D. White, T. S. Presser, W. C.

330

DOE Clears Way for Closure of Emptied Waste Tanks at Idaho National  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

DOE Clears Way for Closure of Emptied Waste Tanks at Idaho National DOE Clears Way for Closure of Emptied Waste Tanks at Idaho National Laboratory DOE Clears Way for Closure of Emptied Waste Tanks at Idaho National Laboratory November 20, 2006 - 9:25am Addthis Secretary Bodman Signs Idaho Waste Determination After Consultation with NRC WASHINGTON, DC - U.S. Secretary of Energy Samuel W. Bodman yesterday signed a waste determination for the Idaho Tank Farm Facility clearing the way for the Department of Energy (DOE) to safely and permanently close the 15 waste storage tanks at the Idaho National Laboratory near Arco, Idaho. DOE will begin grouting the first 11 cleaned and emptied tanks at Idaho Nuclear Technology and Engineering Center (INTEC) and plans to complete all 15 tanks by December 2012. Assistant Secretary of Energy for Environmental Management James Rispoli

331

Numerical Simulation of Cloud–Clear Air Interfacial Mixing: Homogeneous versus Inhomogeneous Mixing  

Science Conference Proceedings (OSTI)

This note presents an analysis of several dozens of direct numerical simulations of the cloud–clear air mixing in a setup of decaying moist turbulence with bin microphysics. The goal is to assess the instantaneous relationship between the ...

Miroslaw Andrejczuk; Wojciech W. Grabowski; Szymon P. Malinowski; Piotr K. Smolarkiewicz

2009-08-01T23:59:59.000Z

332

Distribution of Tropospheric Water Vapor in Clear and Cloudy Conditions from Microwave Radiometric Profiling  

Science Conference Proceedings (OSTI)

A dataset gathered over 369 days in various midlatitude sites with a 12-frequency microwave radiometric profiler is used to analyze the statistical distribution of tropospheric water vapor content (WVC) in clear and cloudy conditions. The WVC ...

Alia Iassamen; Henri Sauvageot; Nicolas Jeannin; Soltane Ameur

2009-03-01T23:59:59.000Z

333

Lidar Determinations of Atmospheric Ice Crystal Layers at South Pole during Clear-Sky Precipitation  

Science Conference Proceedings (OSTI)

Results of lidar measurements of atmospheric ice crystal layers during 36 clear-sky precipitation events at South Pole (2850 m MSL) during the winter over the period March-November 1975 are presented and correlated with ice crystal replicator, ...

Vern N. Smiley; Bruce M. Whitcomb; Bruce M. Morley; Joseph A. Warburton

1980-09-01T23:59:59.000Z

334

MU Radar and Lidar Observations of Clear-Air Turbulence underneath Cirrus  

Science Conference Proceedings (OSTI)

Turbulence generation mechanisms prevalent in the atmosphere are mainly shear instabilities, breaking of internal buoyancy waves, and convective instabilities such as thermal convection due to heating of the ground. In the present work, clear-air ...

Hubert Luce; Takuji Nakamura; Masayuki K. Yamamoto; Mamoru Yamamoto; Shoichiro Fukao

2010-02-01T23:59:59.000Z

335

Numerical Simulation of Cloud–Clear Air Interfacial Mixing: Effects on Cloud Microphysics  

Science Conference Proceedings (OSTI)

This paper extends the previously published numerical study of Andrejczuk et al. on microscale cloud–clear air mixing. Herein, the primary interest is on microphysical transformations. First, a convergence study is performed—with well-resolved ...

Miroslaw Andrejczuk; Wojciech W. Grabowski; Szymon P. Malinowski; Piotr K. Smolarkiewicz

2006-12-01T23:59:59.000Z

336

An Objective Clear-Air Turbulence Forecasting Technique: Verification and Operational Use  

Science Conference Proceedings (OSTI)

An objective technique for forecasting clear-air turbulence (CAT) is described. An index is calculated based on the product of horizontal deformation and vertical wind shear derived from numerical model forecast winds aloft. The forecast ...

Gary P. Ellrod; David I. Knapp

1992-03-01T23:59:59.000Z

337

Clear-Sky Direct-Beam Solar Radiation Versus Altitude: A Proposal for Standard Soundings  

Science Conference Proceedings (OSTI)

The author reexamines Klein's (1948) quantitative statements relating clear-sky direct-beam solar radiation to altitude for the lower troposphere, which are of the form (transmissivity) = B + A log (altitude). Klein's summaries are judged to be ...

William P. Lowry

1980-11-01T23:59:59.000Z

338

Climate Model–Simulated Diurnal Cycles in HIRS Clear-Sky Brightness Temperatures  

Science Conference Proceedings (OSTI)

Clear-sky brightness temperature measurements from the High-Resolution Infrared Radiation Sounder (HIRS) are simulated with two climate models via a radiative transfer code. The models are sampled along the HIRS orbit paths to derive diurnal ...

Ian A. MacKenzie; Simon F. B. Tett; Anders V. Lindfors

2012-09-01T23:59:59.000Z

339

Clear Air Turbulence as a Response to Meso- and Synoptic-Scale Dynamic Processes  

Science Conference Proceedings (OSTI)

Equations for layer-integrated energy and Richardson number tendencies are formulated in isentropic co-ordinates. This formulation leads to the Roach equation for the rate of energy dissipation due to clear air turbulence (CAT). The equation ...

John L. Keller

1990-10-01T23:59:59.000Z

340

Possible Mechanisms of Clear-Air Turbulence in Strongly Anticyclonic Flows  

Science Conference Proceedings (OSTI)

The forecasting of clear-air turbulence (CAT) continues to be a challenging problem despite progress made in the understanding of vertical shear (Kelvin–Helmholtz) instabilities. The possible connections between horizontal anticyclonic flows and ...

John A. Knox

1997-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Improved Simulation of Clear-Sky Shortwave Radiative Transfer in the CCC-GCM  

Science Conference Proceedings (OSTI)

The disposition of mean July clear-sky solar radiation in the Canadian Climate Centre second-generation general circulation model (CCC-GCMII) was analyzed by comparing top of the atmosphere (TOA) net fluxes with earth radiation budget experiment (...

Howard W. Barker; Zhanqing Li

1995-09-01T23:59:59.000Z

342

Clear-Sky Window Channel Radiances: A Comparison between Observations and the ECMWF Model  

Science Conference Proceedings (OSTI)

A comparison of clear-sky radiances of the Meteosat window channel with the European Centre for Medium-Range Weather Forecasts (ECMWF) model results is presented, aiming to assess both the model's performance and the quality of the observations. ...

Isabel F. Trigo; Pedro Viterbo

2003-10-01T23:59:59.000Z

343

A Comparison of Computed and Observed Insolation under Clear Skies over the Pacific Ocean  

Science Conference Proceedings (OSTI)

In an effort to verify computational methods for ocean heat budgets, observations of insulation under clear skies for 26 days were compared with values computed by a formula previously derived from the Smithsonian Tables. The agreement between ...

R. K. Reed; R. E. Brainard

1983-06-01T23:59:59.000Z

344

On the Relationship between Clear-Sky Planetary and Surfae Albedos  

Science Conference Proceedings (OSTI)

Based on simulations, a simple linear relationship is derived between planetary albedo and the surface albedo for the case of clear skies. This relationship enables one to estimate the planetary albedo, given only the surface albedo, and vice ...

T. S. Chen; George Ohring

1984-01-01T23:59:59.000Z

345

A Study of the Incoming Longwave Atmospheric Radiation from a Clear Sky  

Science Conference Proceedings (OSTI)

A band model for atmospheric absorption is used to calculate the incoming longwave atmospheric radiative flux for some typical clear sky conditions. The sky radiation is also measured using a specially-designed calorimetric apparatus over a wide ...

J. W. Ramsey; H. D. Chiang; R. J. Goldstein

1982-04-01T23:59:59.000Z

346

Estimating Beijing's travel delays at intersections with floating car data  

Science Conference Proceedings (OSTI)

In this paper, we presented a technical framework to calculate the turn delays on road network with floating car data (FCD). Firstly the original FCD collected with GPS equipped taxies was cleaned and matched to a street map with a distributed system ... Keywords: float car data, intersection delay, principal curves, trajectory

Xiliang Liu; Feng Lu; Hengcai Zhang; Peiyuan Qiu

2012-11-01T23:59:59.000Z

347

Delay and resource analysis in MANETs in presence of throwboxes  

Science Conference Proceedings (OSTI)

This paper addresses the delay analysis and resource consumption in mobile ad hoc networks (MANETs) equipped with throwboxes. Throwboxes are stationary, wireless devices that act as relays, and that are deployed to increase the connectivity between mobile ... Keywords: Delay analysis, MANET, Markov models, Mobility model, Throwbox

Mouhamad Ibrahim; Ahmad Al Hanbali; Philippe Nain

2007-10-01T23:59:59.000Z

348

Fault Oblivious eXascale Whitepaper  

Science Conference Proceedings (OSTI)

In this paper we present a software system which supports dynamic, irregular, adaptive applications. Data objects are created and structured in a hierarchical manner, with replication as needed to provide a high degree of redundancy. The data objects can contain data, code, tasks (work descriptors with references to data, code, and other tasks) and higher level structures such as work queues. The higher level structures benefit from the properties of the data objects: redundant storage to support resiliency in the face of hardware failure; hierarchical structure to optimize use of the HPC system; and a presence of object names, available in the per-user file system name space, which allows any application, not just specially written HPC applications, to make use of the data even while it is on the HPC system. Our use of hierarchy will make the runtime scalable to very large systems. Our use of redundancy will allow programs to be written in a fault-oblivious manner, eliminating the need for system-level checkpointing. Putting data object names into the file system name space allows for interactive use of the system by users. With this approach, we will be able to finally leave the batch era behind, a half-century after the invention of time sharing. We will be able to stop bounding program through- put by the checkpoint interval. Application data will be accessible at any time, not hidden behind opaque 128-bit pointers or MPI ranks, but given a name that is visible everywhere. Programmers can stop laying out data, and thinking about where the data is, and the code is, and the nodes are, and stick with the problem of what the application is supposed to be doing. This work, if it succeeds, will enable scientific computing to scale to the next generation of machines.

Minnich, Ronald G.; Janssen, Curtis L.; Krishnamoorthy, Sriram; Marquez, Andres; Gokhale, Maya; Sadayappan, Ponnuswamy; Van Hensbergen, Eric; McKie, Jim; Appavoo, Jonathan

2011-06-01T23:59:59.000Z

349

U-154: IBM Rational ClearQuest ActiveX Control Buffer Overflow  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

54: IBM Rational ClearQuest ActiveX Control Buffer Overflow 54: IBM Rational ClearQuest ActiveX Control Buffer Overflow Vulnerability U-154: IBM Rational ClearQuest ActiveX Control Buffer Overflow Vulnerability April 24, 2012 - 7:00am Addthis PROBLEM: IBM Rational ClearQuest ActiveX Control Buffer Overflow Vulnerability PLATFORM: Versions 7.1.1 through 7.1.2.5, 8.0, and 8.0.0.1. ABSTRACT: A vulnerability was reported in IBM Rational ClearQuest. A remote user can cause arbitrary code to be executed on the target user's system. reference links: SecurityTracker Alert ID: 1026958 Secunia Advisory SA48933 CVE-2012-0708 IMPACT ASSESSMENT: High Discussion: The vulnerability is caused due to a function prototype mismatch in the "RegisterSchemaRepoFromFileByDbSet()" function in the IBM Rational ClearQuest ActiveX control (cqole.dll). This can be exploited to cause a

350

U-154: IBM Rational ClearQuest ActiveX Control Buffer Overflow  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

54: IBM Rational ClearQuest ActiveX Control Buffer Overflow 54: IBM Rational ClearQuest ActiveX Control Buffer Overflow Vulnerability U-154: IBM Rational ClearQuest ActiveX Control Buffer Overflow Vulnerability April 24, 2012 - 7:00am Addthis PROBLEM: IBM Rational ClearQuest ActiveX Control Buffer Overflow Vulnerability PLATFORM: Versions 7.1.1 through 7.1.2.5, 8.0, and 8.0.0.1. ABSTRACT: A vulnerability was reported in IBM Rational ClearQuest. A remote user can cause arbitrary code to be executed on the target user's system. reference links: SecurityTracker Alert ID: 1026958 Secunia Advisory SA48933 CVE-2012-0708 IMPACT ASSESSMENT: High Discussion: The vulnerability is caused due to a function prototype mismatch in the "RegisterSchemaRepoFromFileByDbSet()" function in the IBM Rational ClearQuest ActiveX control (cqole.dll). This can be exploited to cause a

351

Broadband optical delay with large dynamic range using atomic dispersion  

E-Print Network (OSTI)

We report on a tunable all-optical delay line for pulses with optical frequency within the Rb $D_2$ absorption line. Pulses of 10 ns duration are delayed in a 10 cm hot vapour cell by up to 40 ns where the transmission reduces to approximately 10%. Using an optical frequency between absorption components from different isotopes allows the delay to be increased or decreased by optical pumping with a second laser, producing rapid tuning over a range more than 40% of the initial delay. We investigate the frequency and intensity ranges in which this delay line can be realised. Our observations are in good agreement with a numerical model of the system.

Vanner, M R; Sidorov, A I; Hannaford, P; Akulshin, A M

2007-01-01T23:59:59.000Z

352

Variability management of safety and reliability models: an intermediate model towards systematic reuse of component fault trees  

Science Conference Proceedings (OSTI)

Reuse of fault trees helps in reducing costs and effort when conducting Fault Tree Analyses (FTAs) for a set of similar systems. Some approaches have been proposed for the systematic reuse of fault trees along with the development of a product line of ... Keywords: component fault trees, fault tree analysis, product line engineering, safety and reliability, variability management

Carolina Gómez; Peter Liggesmeyer; Ariane Sutor

2010-09-01T23:59:59.000Z

353

Risking fault seal in the Gulf Coast: A joint industry study  

SciTech Connect

Analysis of more than 200 faults in a joint-industry study of the Gulf Coast provides a database of actual fault seal behavior in producing fields. This empirical database demonstrates that fault seal behavior is predictable rather than random and that faults are more important than is commonly thought in controlling hydrocarbon accumulations. Quantitative fault seal analysis demonstrates that seal behavior is empirically related to the amount of sand and shale incorporated in the fault zone. Faults with sand-rich gouge leak. Faults with shale-rich gouge seal. An empirically defined threshold allows prediction of fault seal behavior with a high degree of confidence. Fewer than 10% of the faults in the Gulf Coast are exceptions to the rule. Exceptions are a result of other factors including low permeability and high displacement pressure sands, and thin-bedded sand/shale sequences. Examples from these Gulf Coast fields demonstrate the fundamental importance of faults in controlling hydrocarbon accumulations. Faults and fault seal behavior control the presence or absence of hydrocarbons, percent fill, hydrocarbon column heights, entrapment of oil versus gas, and high-side and low-side trap risk. Faults control the lateral distribution of hydrocarbon within fault compartments as well as the vertical distribution of hydrocarbon among stacked sands. Faults control fluid flow during both field development and hydrocarbon migration. Bypassed residual accumulations and unnecessary production wells result from neglecting routine fault seal analysis during field development. Dry holes and mistaken reserves assessments result from neglecting routine fault seal analysis during exploration.

Skerlec, G.M. (PetroQuest International Inc., Franklin, PA (United States))

1996-01-01T23:59:59.000Z

354

New approach to the fault location problem using synchronized sampling  

E-Print Network (OSTI)

This thesis presents a new approach to solving the problem of fault location on a transmission line using synchronized data from both ends of the line. The synchronized phase voltage and current samples taken during the fault transient are used to calculate the location of the fault. Time domain models of lines are used as a basis for derivation of two different algorithms. One algorithm is developed using the RL line model and the other one is developed using the traveling wave based line model. The main idea of the fault location concept is based on the general characteristics of any transmission line. At any location along the unfaulted line, the instantaneous values of voltage and current signals are related to the instantaneous values of the corresponding values of voltage and current signals at both ends of the line, line parameters, and distance between that particular location and each of the line ends. This enables the derivation of the generic fault location equation of the following form: [ ] where Lv is the linear operator, VA, t'A, VB, z'B are vectors of voltage and current samples at line ends, d is the length of the line, and x is the unknown distance to the fault point. For a particular transmission line, the generic equation has a unique form that determines the way it is solved. In any case, the Minimum Square Error Estimation Method is used since an overspecified system of linear equations needs to be solved. The performance evaluation of both algorithms was done using the Electromagnetic Transient Program (EMTP) generated data [1]. Obtained results indicate the high accuracy of the approach and its robustness regarding various fault conditions. The following are the conclusions based on the results presented in this thesis: The error of the approach is rather small and almost invariant to the various fault conditions and, hence, the technique provides a robust solution to the fault location problem. The new approach has high accuracy while the computational burden is still kept relatively low. The synchronized sampling technique required for this approach is emerging as a reliable and cost effective practice.

Mrkic, Jasna

1994-01-01T23:59:59.000Z

355

Identifying Efficiency Degrading Faults in Split Air Conditioning Systems  

E-Print Network (OSTI)

Studies estimate that as much as 50% of packaged air conditioning systems operate in faulty conditions that degrade system efficiency. Common faults include: under- and over-charged systems (too much or too little refrigerant), faulty expansions valves (stuck valves, valve hunting, poorly tuned valve controllers), and fouled evaporators and condensers. Furthermore, air conditioning systems can often be adjusted to improve efficiency while continuing to meet cooling loads (adjusting system pressures, decreasing superheat setpoints). This study presents the design of a low cost device that can non-invasively measure system operating conditions, diagnose faults, estimate potential energy savings, and provide recommendations on how the system should be adjusted or repaired. Using eight external temperature measurements, the device potentially can detect and diagnose up to ten faults commonly found in HVAC systems. Steady state temperatures are compared to threshold values obtained from literature and HVAC manufacturers to detect and determine the severity of faults and subsequent reductions in coefficient of performance. Preliminary tests reveal the potential for the device to detect and diagnose common efficiency-degrading faults in HVAC systems.

Terrill, T. J.; Brown, M. L.; Cheyne, R. W. Jr.; Cousins, A. J.; Daniels, B. P.; Erb, K. L.; Garcia, P. A.; Leutermann, M. J.; Nel, A. J.; Robert, C. L.; Widger, S. B.; Williams, A. G.; Rasmussen, B. P.

2013-01-01T23:59:59.000Z

356

Accident Fault Trees for Defense Waste Processing Facility  

Science Conference Proceedings (OSTI)

The purpose of this report is to document fault tree analyses which have been completed for the Defense Waste Processing Facility (DWPF) safety analysis. Logic models for equipment failures and human error combinations that could lead to flammable gas explosions in various process tanks, or failure of critical support systems were developed for internal initiating events and for earthquakes. These fault trees provide frequency estimates for support systems failures and accidents that could lead to radioactive and hazardous chemical releases both on-site and off-site. Top event frequency results from these fault trees will be used in further APET analyses to calculate accident risk associated with DWPF facility operations. This report lists and explains important underlying assumptions, provides references for failure data sources, and briefly describes the fault tree method used. Specific commitments from DWPF to provide new procedural/administrative controls or system design changes are listed in the ''Facility Commitments'' section. The purpose of the ''Assumptions'' section is to clarify the basis for fault tree modeling, and is not necessarily a list of items required to be protected by Technical Safety Requirements (TSRs).

Sarrack, A.G.

1999-06-22T23:59:59.000Z

357

New fault locating system for air-insulated substations using optical current detector  

Science Conference Proceedings (OSTI)

This paper deals with a newly developed fault locating system. This fault locating system helps to shorten the time required for restoration of service after the occurrence of a busbar fault in an air-insulated distribution substation. Recent optical and electronic technologies allow highly accurate and compact fault locating system, which consists of optical current detectors using Faraday effect and a fault locating processor employing digital data processing technique. The fault location is made by discriminating the direction of zero-sequence currents. Through various tests and field operations it has been confirmed that the system has sufficient performance for practical application.

Yoshida, Y.; Kawazoe, S. (Kansai Electric Power Co., Inc., Osaka (Japan)); Ibuki, K.; Yamada, K.; Ochi, N. (Mitsubishi Electric Corp., Amagasaki, Hyogo (Japan). Itami Works)

1992-10-01T23:59:59.000Z

358

Modeling biological systems with delays in Bio-PEPA  

E-Print Network (OSTI)

Delays in biological systems may be used to model events for which the underlying dynamics cannot be precisely observed, or to provide abstraction of some behavior of the system resulting more compact models. In this paper we enrich the stochastic process algebra Bio-PEPA, with the possibility of assigning delays to actions, yielding a new non-Markovian process algebra: Bio-PEPAd. This is a conservative extension meaning that the original syntax of Bio-PEPA is retained and the delay specification which can now be associated with actions may be added to existing Bio-PEPA models. The semantics of the firing of the actions with delays is the delay-as-duration approach, earlier presented in papers on the stochastic simulation of biological systems with delays. These semantics of the algebra are given in the Starting-Terminating style, meaning that the state and the completion of an action are observed as two separate events, as required by delays. Furthermore we outline how to perform stochastic simulation of Bio...

Caravagna, Giulio; 10.4204/EPTCS.40.7

2010-01-01T23:59:59.000Z

359

Delayed feedback control of fractional-order chaotic systems  

E-Print Network (OSTI)

We study the possibility to stabilize unstable steady states and unstable periodic orbits in chaotic fractional-order dynamical systems by the time-delayed feedback method. By performing a linear stability analysis, we establish the parameter ranges for successful stabilization of unstable equilibria in the plane parametrizad by the feedback gain and the time delay. An insight into the control mechanism is gained by analyzing the characteristic equation of the controlled system, showing that the control scheme fails to control unstable equilibria having an odd number of positive real eigenvalues. We demonstrate that the method can also stabilize unstable periodic orbits for a suitable choice of the feedback gain, providing that the time delay is chosen to coincide with the period of the target orbit. In addition, it is shown numerically that delayed feedback control with a sinusoidally modulated time delay significantly enlarges the stability region of the steady states in comparison to the classical time-delayed feedback scheme with a constant delay.

Aleksandar Gjurchinovski; Trifce Sandev; Viktor Urumov

2010-05-17T23:59:59.000Z

360

Development of a statistically based access delay timeline methodology.  

SciTech Connect

The charter for adversarial delay is to hinder access to critical resources through the use of physical systems increasing an adversary's task time. The traditional method for characterizing access delay has been a simple model focused on accumulating times required to complete each task with little regard to uncertainty, complexity, or decreased efficiency associated with multiple sequential tasks or stress. The delay associated with any given barrier or path is further discounted to worst-case, and often unrealistic, times based on a high-level adversary, resulting in a highly conservative calculation of total delay. This leads to delay systems that require significant funding and personnel resources in order to defend against the assumed threat, which for many sites and applications becomes cost prohibitive. A new methodology has been developed that considers the uncertainties inherent in the problem to develop a realistic timeline distribution for a given adversary path. This new methodology incorporates advanced Bayesian statistical theory and methodologies, taking into account small sample size, expert judgment, human factors and threat uncertainty. The result is an algorithm that can calculate a probability distribution function of delay times directly related to system risk. Through further analysis, the access delay analyst or end user can use the results in making informed decisions while weighing benefits against risks, ultimately resulting in greater system effectiveness with lower cost.

Rivera, W. Gary; Robinson, David Gerald; Wyss, Gregory Dane; Hendrickson, Stacey M. Langfitt

2013-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Detection of Rooftop Cooling Unit Faults Based on Electrical Measurements  

Science Conference Proceedings (OSTI)

Non-intrusive load monitoring (NILM) is accomplished by sampling voltage and current at high rates and reducing the resulting start transients or harmonic contents to concise ''signatures''. Changes in these signatures can be used to detect, and in many cases directly diagnose, equipment and component faults associated with roof-top cooling units. Use of the NILM for fault detection and diagnosis (FDD) is important because (1) it complements other FDD schemes that are based on thermo-fluid sensors and analyses and (2) it is minimally intrusive (one measuring point in the relatively protected confines of the control panel) and therefore inherently reliable. This paper describes changes in the power signatures of fans and compressors that were found, experimentally and theoretically, to be useful for fault detection.

Armstrong, Peter R.; Laughman, C R.; Leeb, S B.; Norford, L K.

2006-01-31T23:59:59.000Z

362

Optimizing automated gas turbine fault detection using statistical pattern recognition  

SciTech Connect

A method enabling the automated diagnosis of Gas Turbine Compressor blade faults, based on the principles of statistical pattern recognition is initially presented. The decision making is based on the derivation of spectral patterns from dynamic measurements data and then the calculation of discriminants with respect to reference spectral patterns of the faults while it takes into account their statistical properties. A method of optimizing the selection of discriminants using dynamic measurements data is also presented. A few scalar discriminants are derived, in such a way that the maximum available discrimination potential is exploited. In this way the success rate of automated decision making is further improved, while the need for intuitive discriminant selection is eliminated. The effectiveness of the proposed methods is demonstrated by application to data coming from an Industrial Gas Turbine while extension to other aspects of Fault Diagnosis is discussed. 9 refs.

Loukis, E.; Mathioudakis, K.; Papailiou, K. (Athens National Technical Univ. (Greece))

1992-01-01T23:59:59.000Z

363

Optimizing automated gas turbine fault detection using statistical pattern recognition  

SciTech Connect

A method enabling the automated diagnosis of gas turbine compressor blade faults, based on the principles of statistical pattern recognition, is initially presented. The decision making is based on the derivation of spectral patterns from dynamic measurement data and then the calculation of discriminants with respect to reference spectral patterns of the faults while it takes into account their statistical properties. A method of optimizing the selection of discriminants using dynamic measurement data is also presented. A few scalar discriminants are derived, in such a way that the maximum available discrimination potential is exploited. In this way the success rate of automated decision making is further improved, while the need for intuitive discriminant selection is eliminated. The effectiveness of the proposed methods is demonstrated by application to data coming from an industrial gas turbine while extension to other aspects of fault diagnosis is discussed.

Loukis, E.; Mathioudakis, K.; Papailiou, K. (National Technical Univ. of Athens (Greece). Lab. of Thermal Turbomachines)

1994-01-01T23:59:59.000Z

364

Adiabatic Quantum Programming: Minor Embedding With Hard Faults  

SciTech Connect

Adiabatic quantum programming defines the time-dependent mapping of a quantum algorithm into the hardware or logical fabric. An essential programming step is the embedding of problem-specific information into the logical fabric to define the quantum computational transformation. We present algorithms for embedding arbitrary instances of the adiabatic quantum optimization algorithm into a square lattice of specialized unit cells. Our methods are shown to be extensible in fabric growth, linear in time, and quadratic in logical footprint. In addition, we provide methods for accommodating hard faults in the logical fabric without invoking approximations to the original problem. These hard fault-tolerant embedding algorithms are expected to prove useful for benchmarking the adiabatic quantum optimization algorithm on existing quantum logical hardware. We illustrate this versatility through numerical studies of embeddabilty versus hard fault rates in square lattices of complete bipartite unit cells.

Klymko, Christine F [ORNL] [ORNL; Sullivan, Blair D [ORNL] [ORNL; Humble, Travis S [ORNL] [ORNL

2013-01-01T23:59:59.000Z

365

Impact of delayed neutron precursor mobility in fissile solution systems  

Science Conference Proceedings (OSTI)

A research version of the Monte Carlo software package MCNP6 is modified to incorporate advection and diffusion of delayed neutron precursors, resulting in the emission of delayed neutrons at locations different from the original fission sites. Results of two test problems, a pipe carrying flowing fissile solution and a sphere of fissile solution with precursor diffusion, show that the fission product mobility tends to perturb the fundamental mode, has a negative reactivity effect, and, perhaps most importantly, causes a decrease in the effective delayed neutron fraction. (authors)

Kiedrowski, B. C. [X-Computational Physics Div., Los Alamos National Laboratory, MS A143, P.O. Box 1663, Los Alamos, NM 87545 (United States)

2012-07-01T23:59:59.000Z

366

Telluric Survey At Clear Lake Area (Skokan, 1993) | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » Telluric Survey At Clear Lake Area (Skokan, 1993) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Telluric Survey At Clear Lake Area (Skokan, 1993) Exploration Activity Details Location Clear Lake Area Exploration Technique Telluric Survey Activity Date Usefulness useful DOE-funding Unknown Notes By far, the greatest effort in the area of Mount Konocti to understand the deep structure and hydrology was accomplished through use of a controlled source transient electromagnetic survey (Keller and Jacobson, 1983 ). A grounded-wire source of 1.1 km in length was energized with a current of

367

Testing the Probability of Clear Line of Sight Models with ARM Observations  

NLE Websites -- All DOE Office Websites (Extended Search)

the Probability of Clear Line of Sight Models the Probability of Clear Line of Sight Models with ARM Observations Y. Ma Department of Meteorology University of Maryland College Park, Maryland R. G. Ellingson Department of Meteorology Florida State University Tallahassee, Florida Abstract Clouds play a major role in regulating Earth's climate. However, computer models of Earth's climate neglect the effects of cloud vertical extend in a broken cloud field. The vertical extent allows clouds to shade more of the atmosphere and allow radiative exchange over a larger temperature range. One way to parameterize this 3D cloud effect is to relate the various cloud properties, including the cloud vertical extent, to a statistical cloud field parameter called the probability of clear line of sight (PCLS) (see

368

Direct-Current Resistivity Survey At Clear Lake Area (Skokan, 1993) | Open  

Open Energy Info (EERE)

Area (Skokan, 1993) Area (Skokan, 1993) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Direct-Current Resistivity Survey At Clear Lake Area (Skokan, 1993) Exploration Activity Details Location Clear Lake Area Exploration Technique Direct-Current Resistivity Survey Activity Date Usefulness useful DOE-funding Unknown Notes Several direct-current, bipole-dipole surveys were carried out in the area. These field measurements (Rapolla and Keller, 1984) were combined by spatially averaging apparent resistivities on a one kilometer grid ( Fig. 6 ). The authors felt that local geologic noise could be reduced and large-scale features would be emphasized by this averaging. The most significant feature which resulted was a clear electrical signature of the

369

A simple packet retransmission strategy for throughput and delay enhancement on power line communication channels  

SciTech Connect

A new, simple, and effective communication protocol is developed and evaluated for use on power line distribution networks. The protocol involves retransmission of unacknowledged packets, which are sent in either single or multiple (N) copies in accordance with estimates of communication link quality. Multiple packet copies can be code combined at the receiver, using majority voting on each bit position, to reduce packet error rates. Adaptive link quality estimates are based on the receipt or absence of positive acknowledgements. Information throughput efficiency is calculated and N optimized in terms of system variables. Performance benefits of code combining are clearly demonstrated. The algorithm was implemented and tested using a five-station intrabuilding power line communications network operating at 1.2, 2.4, 4.8 and 9.6 kbit/s data rate. Substantial throughput and delay improvement occurred on poor quality links, without degrading performance on good links.

Onunga, J.O. (Kenya Posts and Telecommunications Corp., Nairobi (Kenya)); Donaldson, R.W. (Univ. of British Columbia, Vancouver (Canada). Dept. of Electrical Engineering)

1993-07-01T23:59:59.000Z

370

New Limits on Fault-Tolerant Quantum Computation  

E-Print Network (OSTI)

We show that quantum circuits cannot be made fault-tolerant against a depolarizing noise level of approximately 45%, thereby improving on a previous bound of 50% (due to Razborov). Our precise quantum circuit model enables perfect gates from the Clifford group (CNOT, Hadamard, S, X, Y, Z) and arbitrary additional one-qubit gates that are subject to that much depolarizing noise. We prove that this set of gates cannot be universal for arbitrary (even classical) computation, from which the upper bound on the noise threshold for fault-tolerant quantum computation follows.

Harry Buhrman; Richard Cleve; Monique Laurent; Noah Linden; Alexander Schrijver; Falk Unger

2006-04-19T23:59:59.000Z

371

Fault detection of multivariable system using its directional properties  

E-Print Network (OSTI)

A novel algorithm for making the combination of outputs in the output zero direction of the plant always equal to zero was formulated. Using this algorithm and the result of MacFarlane and Karcanias, a fault detection scheme was proposed which utilizes the directional property of the multivariable linear system. The fault detection scheme is applicable to linear multivariable systems. Results were obtained for both continuous and discrete linear multivariable systems. A quadruple tank system was used to illustrate the results. The results were further verified by the steady state analysis of the plant.

Pandey, Amit Nath

2004-12-01T23:59:59.000Z

372

Sherlock—a system for diagnosing power distribution ring network faults  

Science Conference Proceedings (OSTI)

This paper reports the development of a software system, SHERLOCK, for fault diagnosis in power distribution ring networks. The system consists of a fault diagnosis subsystem implemented using Prolog and a user interface subsystem developed in the SmallTalk ...

Kit Po Wong; Chi Ping Tsang; Wan Yee Chan

1988-06-01T23:59:59.000Z

373

Model Acceptability Measure for the Identification of Failures in Qualitative Fault Monitoring Systems  

E-Print Network (OSTI)

This paper deals with two of the main tasks of Fault Monitoring Systems (FMS): fault detection and fault identification. During fault detection, the FMS should recognize that the plant behavior is abnormal, and therefore, that the plant is not working properly. During fault identification, the FMS should conclude which type of failure has occurred. The first goal of this work is to consolidate a new fault detection technique, called enveloping, that was developed in the context of the Fuzzy Inductive Reasoning Fault Monitoring System (FIRFMS). The second and primary goal of this paper is to introduce the model acceptability measure as a tool to enhance and make more robust the fault identification process in the context of FIRFMS. The enveloping technique and the model acceptability measure are applied to an electric circuit model previously used for such purpose in the literature. It is shown that the new methods outperform the ones previously advocated in FIRFMS for that purpose 1 ...

Antoni Escobet Angela; Angela Nebot; Francois E. Cellier

1999-01-01T23:59:59.000Z

374

FERRARI: A Flexible Software-Based Fault and Error Injection System  

Science Conference Proceedings (OSTI)

AbstractżA major step toward the development offault-tolerant computer systems is the validation of the dependability properties of these systems. Fault/error injection has been recognized as a powerful approach to validate the fault tolerance mechanisms ...

Ghani A. Kanawati; Nasser A. Kanawati; Jacob A. Abraham

1995-02-01T23:59:59.000Z

375

The dynamics of oceanic transform faults : constraints from geophysical, geochemical, and geodynamical modeling  

E-Print Network (OSTI)

Segmentation and crustal accretion at oceanic transform fault systems are investigated through a combination of geophysical data analysis and geodynamical and geochemical modeling. Chapter 1 examines the effect of fault ...

Gregg, Patricia Michelle Marie

2008-01-01T23:59:59.000Z

376

Interseismic strain accumulation and the earthquake potential on the southern San Andreas fault system  

E-Print Network (OSTI)

lat- ter would imply subsidence to the east of the fault.indicate uplift, rather subsidence, to the east of the faultlikely involves ground subsidence to the west of the fault.

Fialko, Y

2006-01-01T23:59:59.000Z

377

Nail-it-down: nailing and fixing configuration faults in cloud environments  

Science Conference Proceedings (OSTI)

Faults due to configuration of resources account for majority of errors in distributed software systems. Yet, the problem of identifying faulty configuration remains at large. Current approaches for fault identification are focused on event correlation ...

Kalapriya Kannan; Anuradha Bhamidipaty

2013-05-01T23:59:59.000Z

378

A COTS Wrapping Toolkit for Fault Tolerant Applications under Windows NT  

Science Conference Proceedings (OSTI)

This paper presents a software toolkit that allows enhancing the fault tolerant characteristics of a user application running under a Windows NT platform through sets of interchangeable and customizable Fault Tolerant Interposition Agents (FTI Agents). ...

Alfredo Benso; Silvia Chiusano; Paolo Prinetto

2000-07-01T23:59:59.000Z

379

Wetland Loss Is Not The Fault of Any One Company | America's ...  

U.S. Energy Information Administration (EIA)

Wetland Loss Is Not The Fault of Any One Company. By: Berwick Duvall II, Houma Courrier | 9.28.2007 September 28, 2007 Wetlands loss is not the fault ...

380

Observations on Faults and Associated Permeability Structures in Hydrogeologic Units at the Nevada Test Site  

SciTech Connect

Observational data on Nevada Test Site (NTS) faults were gathered from a variety of sources, including surface and tunnel exposures, core samples, geophysical logs, and down-hole cameras. These data show that NTS fault characteristics and fault zone permeability structures are similar to those of faults studied in other regions. Faults at the NTS form complex and heterogeneous fault zones with flow properties that vary in both space and time. Flow property variability within fault zones can be broken down into four major components that allow for the development of a simplified, first approximation model of NTS fault zones. This conceptual model can be used as a general guide during development and evaluation of groundwater flow and contaminate transport models at the NTS.

Prothro, Lance B.; Drellack, Sigmund L.; Haugstad, Dawn N.; Huckins-Gang, Heather E.; Townsend, Margaret J.

2009-03-30T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Slip on ridge transform faults : insights from earthquakes and laboratory experiments  

E-Print Network (OSTI)

The relatively simple tectonic environment of mid-ocean ridge transform fault (RTF) seismicity provides a unique opportunity for investigation of earthquake and faulting processes. We develop a scaling model that is complete ...

Boettcher, Margaret S

2005-01-01T23:59:59.000Z

382

TWO MILLISECOND PULSARS DISCOVERED BY THE PALFA SURVEY AND A SHAPIRO DELAY MEASUREMENT  

SciTech Connect

We present two millisecond pulsar discoveries from the PALFA survey of the Galactic plane with the Arecibo telescope. PSR J1955+2527 is an isolated pulsar with a period of 4.87 ms, and PSR J1949+3106 has a period of 13.14 ms and is in a 1.9 day binary system with a massive companion. Their timing solutions, based on 4 years of timing measurements with the Arecibo, Green Bank, Nancay, and Jodrell Bank telescopes, allow precise determination of spin and astrometric parameters, including precise determinations of their proper motions. For PSR J1949+3106, we can clearly detect the Shapiro delay. From this we measure the pulsar mass to be 1.47{sup +0.43}{sub -0.31} M{sub Sun }, the companion mass to be 0.85{sup +0.14}{sub -0.11} M{sub Sun }, and the orbital inclination to be i = 79.9{sup -1.9}{sub +1.6} deg, where uncertainties correspond to {+-}1{sigma} confidence levels. With continued timing, we expect to also be able to detect the advance of periastron for the J1949+3106 system. This effect, combined with the Shapiro delay, will eventually provide very precise mass measurements for this system and a test of general relativity.

Deneva, J. S.; Camilo, F. [Arecibo Observatory, HC3 Box 53995, Arecibo, PR 00612 (United States); Freire, P. C. C.; Champion, D. J.; Desvignes, G. [Max-Planck-Institut fuer Radioastronomie, D-53121 Bonn (Germany); Cordes, J. M.; Brazier, A.; Chatterjee, S. [Astronomy Department, Cornell University, Ithaca, NY 14853 (United States); Lyne, A. G. [Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester M13 9PL (United Kingdom); Ransom, S. M. [National Radio Astronomy Observatory, Charlottesville, VA 22903 (United States); Cognard, I. [Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, LPC2E, CNRS et Universite d'Orleans, and Station de radioastronomie de Nancay, Observatoire de Paris (France); Nice, D. J. [Department of Physics, Lafayette College, Easton, PA 18042 (United States); Stairs, I. H. [Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1 (Canada); Allen, B. [Albert-Einstein-Institut, Max-Planck-Institut fuer Gravitationsphysik, D-30167 Hannover (Germany); Bhat, N. D. R. [Center for Astrophysics and Supercomputing, Swinburne University, Hawthorn, Victoria 3122 (Australia); Bogdanov, S. [Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States); Crawford, F. [Department of Physics and Astronomy, Franklin and Marshall College, P.O. Box 3003, Lancaster, PA 17604 (United States); Hessels, J. W. T. [ASTRON, Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA Dwingeloo (Netherlands); Jenet, F. A. [Center for Gravitational Wave Astronomy, University of Texas at Brownsville, Brownsville, TX 78520 (United States); Kaspi, V. M. [Department of Physics, McGill University, 3600 rue Universite, Montreal, QC H3A 2T8 (Canada); and others

2012-09-20T23:59:59.000Z

383

The Effects of Simulated Inertia and Force Prediction on Delayed Telepresence  

Science Conference Proceedings (OSTI)

This paper presents two methods aimed at alleviating the negative effects of network delays on teleoperation. The problem of telepresence across delayed networks is well known. A delay in feedback information such as visual and haptic data can make the ...

Stella Clarke; Gerhard Schillhuber; Michael F. Zaeh; Heinz Ulbrich

2007-10-01T23:59:59.000Z

384

Adaptive control of time delay systems and applications to automotive control problems  

E-Print Network (OSTI)

This thesis is about the adaptive control of time delay systems with applications to automotive control problems. The stabilization of systems involving time delays is a difficult problem since the existence of a delay may ...

Yildiz, Yildiray

2009-01-01T23:59:59.000Z

385

Regional seismic reflection line, southern Illinois Basin, provides new data on Cambrian rift geometry, Hicks Dome genesis, and the Fluorspar Area Fault Complex  

SciTech Connect

Detailed studies of the subsurface structure of the Cambrian Reelfoot rift (RFR) in the Midwestern US provide important insights into continental rifting processes and into the structural fabric of a zone of modern intracratonic seismicity (New Madrid zone). High-quality oil industry seismic reflection data show that in the area of transition between the RFR and the Rough Creek Graben (RCG) the geometry of the Cambrian rift system is that of a half-graben that thickens to the southeast. This contrasts with the northward-thickening half-graben observed to the east in the RCG and with the more symmetric graben to the south in the RFR. An 82.8-km segment of a northwest-southeast seismic reflection profile in southeastern Illinois and western Kentucky shows that near Hicks Dome, Illinois, Middle and Lower Cambrian syn-rift sedimentary rocks occupy about 0.35 s (two-way travel time) on the seismic reflection section (corresponding to a thickness of about 970 m). This stratigraphic interval occupies about 0.45 s (1,250 m) near the Ohio river and is thickest against the Tabb Fault System (TFS) in Kentucky, where it occupies 0.7 s (1,940 m). The seismic data show that in this part of the Cambrian rift the master fault was part of the TFS and that normal displacement on the TFS continued through middle Paleozoic time. The seismic data also provide new information on the late Paleozoic development of Hicks-Dome and the surrounding Fluorspar Area Fault Complex (FAFC) in southeastern Illinois and western Kentucky. A series of grabens and horsts in the FAFC document a late Paleozoic reactivation of the RFR. Comparison of the reflection data with surface mineralization patterns shows that in most cases mineralized graben-bounding faults clearly cut basement or are splays from faults that cut basement.

Potter, C.J.; Goldhaber, M.B.; Taylor, C.D. (U.S. Geological Survey, Denver, CO (United States)); Heigold, P.C. (Illinois State Geological Survey, Champaign, IL (United States))

1992-01-01T23:59:59.000Z

386

MHK Technologies/Tidal Delay | Open Energy Information  

Open Energy Info (EERE)

Delay Delay < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Tidal Delay.png Technology Profile Primary Organization Woodshed Technologies Ltd Technology Resource Click here Current Technology Type Click here Overtopping Technology Readiness Level Click here TRL 1 3 Discovery Concept Def Early Stage Dev Design Engineering Technology Description The Tidal Delay utilizes an existing natural land formation such as a peninsula or isthmus that creates a natural tidal barrier separating moving rising and falling bodies of seawater As the seawater on each side of the natural barrier rises and falls the device captures the energy resulting from the difference in water levels across the barrier using proven hydroelectric technology The device utilizes a standard impulse turbine installed in siphon pipe over under the natural barrier

387

Electron-capture delayed fission properties of 244Es  

Science Conference Proceedings (OSTI)

Electron-capture delayed fission was observed in {sup 244}Es produced via the {sup 237}Np({sup 12}C,5n){sup 244}Es reaction at 81 MeV (on target) with a production cross section of 0.31{+-}0.12 {micro}b. The mass-yield distribution of the fission fragments is highly asymmetric. The average preneutron-emission total kinetic energy of the fragments was measured to be 186{+-}19 MeV. Based on the ratio of the number of fission events to the measured number of {alpha} decays from the electron-capture daughter {sup 244}Cf (100% {alpha} branch), the probability of delayed fission was determined to be (1.2{+-}0.4) x 10{sup -4}. This value for the delayed fission probability fits the experimentally observed trend of increasing delayed fission probability with increasing Q value for electron-capture.

Shaughnessy, Dawn A.; Gregorich, Kenneth E.; Adams, Jeb L.; Lane, Michael R.; Laue, Carola A.; Lee, Diana M.; McGrath, Christopher A.; Ninov, Victor; Patin, Joshua B.; Strellis, Dan A.; Sylwester, Eric R.; Wilk, Philip A.; Hoffman, Darleane C.

2001-03-16T23:59:59.000Z

388

Opportunities for Process Monitoring Techniques at Delayed Access Facilities  

Science Conference Proceedings (OSTI)

Except for specific cases where the International Atomic Energy Agency (IAEA) maintains a continuous presence at a facility (such as the Japanese Rokkasho Reprocessing Plant), there is always a period of time or delay between the moment a State is notified or aware of an upcoming inspection, and the time the inspector actually enters the material balance area or facility. Termed by the authors as “delayed access,” this period of time between inspection notice and inspector entrance to a facility poses a concern. Delayed access also has the potential to reduce the effectiveness of measures applied as part of the Safeguards Approach for a facility (such as short-notice inspections). This report investigates the feasibility of using process monitoring to address safeguards challenges posed by delayed access at a subset of facility types.

Curtis, Michael M.; Gitau, Ernest TN; Johnson, Shirley J.; Schanfein, Mark; Toomey, Christopher

2013-09-20T23:59:59.000Z

389

Evaluating passenger delays in the US domestic air transportation system  

E-Print Network (OSTI)

A fundamental component of any National Airspace System (NAS) performance evaluation is the cost impact of air traffic delays, and more generally capacity limitations, on the traveling passengers. In previous research it ...

Umang, Nitish

2010-01-01T23:59:59.000Z

390

Statistical modelling of delays in a rail freight transportation network  

Science Conference Proceedings (OSTI)

This study analyzes the transportation network of a major rail freight operator in order to obtain a model of delay propagation of trains connecting intermodal terminals. Operational management of a rail freight operator needs to take into account deviations ...

János Barta; Andrea Emilio Rizzoli; Matteo Salani; Luca Maria Gambardella

2012-12-01T23:59:59.000Z

391

Real Time Models of the Asynchronous Circuits: The Delay Theory  

E-Print Network (OSTI)

The chapter from the book introduces the delay theory, whose purpose is the modeling of the asynchronous circuits from digital electrical engineering with ordinary and differential pseudo-boolean equations.

Serban E. Vlad

2004-12-17T23:59:59.000Z

392

A general method for calculating co-seismic gravity changes in complex fault systems  

Science Conference Proceedings (OSTI)

A general method for calculating the total, dilatational, and free-air gravity for fault systems with arbitrary geometry, slip motion, and number of fault segments is presented. The technique uses a Green's function approach for a fault buried within ... Keywords: 91.10.-v, 91.10.Kg, 91.10.Op, 91.30.Px, Alaska, California, Fault network, Time-variable gravity

T. J. Hayes; K. F. Tiampo; J. B. Rundle; J. Fernández

2008-11-01T23:59:59.000Z

393

A model for the evaluation of fault tolerance in the FERMI system  

Science Conference Proceedings (OSTI)

Experiments of high energy physics planned at the Large Hadron Collider (LHC) at CERN (CH) require digital data acquisition systems with high throughput. Such systems need also be fault tolerant to the permanent and transient faults induced by radiation, ... Keywords: FERMI microsystem, Large Hadron Collider, VLSI, VLSI devices, data acquisition, digital data acquisition system, fault tolerance, fault tolerant computing, high energy physics, high energy physics instrumentation computing, model, nuclear electronics, radiation effects

A. Antola; L. Breveglieri

1995-11-01T23:59:59.000Z

394

Fault analysis of a semisubmersible's ballast control system  

SciTech Connect

This paper presents a practical ballast system for a twinhull design semisubmersible as an answer to the problems which could result from faults both interior and exterior to the system. The design presented is then examined through a fault analysis technique common to other industries and applicable to the life-sustaining ballast system. This examination confirms the design philosophy that a single fault or reasonable multiple faults should not lead to destabilization of the vessel.

Hock, C.J.; Balaban, E.G.

1984-05-01T23:59:59.000Z

395

Computer Aided Fault Tree Analysis System (CAFTA), Version 6.0 Demo  

Science Conference Proceedings (OSTI)

CAFTA is a computer software program used for developing reliability models of large complex systems, using fault tree and event tree methodology.DescriptionCAFTA is designed to meet the many needs of reliability analysts while performing fault tree/event tree analysis on a system or group of systems.  It includes:Fault Tree Editor for building, updating and printing fault tree modelsEvent Tree Editor for building, ...

2013-02-18T23:59:59.000Z

396

The University of Texas at Austin Jan-11 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan-11 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1.7% DP Form #31 - Page 1(Rev. 1/93) #12;The University of Texas at Austin Jan-11 PART I CRIMES BURGLARY/93) #12;The University of Texas at Austin Jan-11 PART I CRIMES BURGLARY & THEFT TARGET SECTION (List Other

Johns, Russell Taylor

397

The University of Texas at Austin Jan-00 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan-00 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1.3% DP Form #31 - Page 1(Rev. 1/93) #12;The University of Texas at Austin Jan-00 PART I CRIMES BURGLARY of Texas at Austin Jan-00 PART I CRIMES BURGLARY & THEFT TARGET SECTION (List Other Target Areas) #/Month

Johns, Russell Taylor

398

The University of Texas at Austin Jan-06 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan-06 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1 Total % Rcvd. 1.0% DP Form #31 - Page 1(Rev. 1/93) #12;The University of Texas at Austin Jan-06 PART I/93) #12;The University of Texas at Austin Jan-06 PART I CRIMES BURGLARY & THEFT TARGET SECTION (List Other

Johns, Russell Taylor

399

The University of Texas at Austin Jan-09 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan-09 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1. 8.0% DP Form #31 - Page 1(Rev. 1/93) #12;The University of Texas at Austin Jan-09 PART I CRIMES/93) #12;The University of Texas at Austin Jan-09 PART I CRIMES BURGLARY & THEFT TARGET SECTION (List Other

Johns, Russell Taylor

400

The University of Texas at Austin Jan-08 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan-08 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1 Total % Rcvd. 2.2% DP Form #31 - Page 1(Rev. 1/93) #12;The University of Texas at Austin Jan-08 PART I(Rev. 1/93) #12;The University of Texas at Austin Jan-08 PART I CRIMES BURGLARY & THEFT TARGET SECTION

Johns, Russell Taylor

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

The University of Texas at Austin Jan-04 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan-04 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1.1% DP Form #31 - Page 1(Rev. 1/93) #12;The University of Texas at Austin Jan-04 PART I CRIMES BURGLARY University of Texas at Austin Jan-04 PART I CRIMES BURGLARY & THEFT TARGET SECTION (List Other Target Areas

Johns, Russell Taylor

402

The University of Texas at Austin Jan-01 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan-01 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1/93) #12;The University of Texas at Austin Jan-01 PART I CRIMES BURGLARY & THEFT TARGET SECTION Maintenance. 1/93)Co #12;The University of Texas at Austin Jan-01 PART I CRIMES BURGLARY & THEFT TARGET SECTION

Johns, Russell Taylor

403

The University of Texas at Austin Jan-05 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan-05 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1/93) #12;The University of Texas at Austin Jan-05 PART I CRIMES BURGLARY & THEFT TARGET SECTION Maintenance - Page 2(Rev. 1/93) #12;The University of Texas at Austin Jan-05 PART I CRIMES BURGLARY & THEFT TARGET

Johns, Russell Taylor

404

The University of Texas at Austin Jan-10 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan-10 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1 of Texas at Austin Jan-10 PART I CRIMES BURGLARY & THEFT TARGET SECTION Maintenance Shops Offices 6 OF REPORT DP Form #31 - Page 2(Rev. 1/93) #12;The University of Texas at Austin Jan-10 PART I CRIMES

Johns, Russell Taylor

405

The University of Texas at Austin Jan-02 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan-02 PART I CRIMES Reported Unfounded Actual Cleared % Clrd. 1 Theft Total $280 $280 Total % Rcvd 0.4% DP Form #31 - Page 1(Rev. 1/93) #12;The University of Texas/93)Co #12;The University of Texas at Austin Jan-02 PART I CRIMES BURGLARY & THEFT TARGET SECTION (List

Johns, Russell Taylor

406

The University of Texas at Austin Jan07 PART I CRIMES Reported Unfounded Actual Cleared % Clrd.  

E-Print Network (OSTI)

The University of Texas at Austin Jan07 PART I CRIMES Reported Unfounded Actual Cleared.1% DP Form #31 Page 1(Rev. 1/93) #12;The University of Texas at Austin Jan07 PART I CRIMES BURGLARY Form #31 Page 2(Rev. 1/93) #12;The University of Texas at Austin Jan07 PART I CRIMES BURGLARY

Johns, Russell Taylor

407

Application of the Lighthill–Ford Theory of Spontaneous Imbalance to Clear-Air Turbulence Forecasting  

Science Conference Proceedings (OSTI)

A new method of clear-air turbulence (CAT) forecasting based on the Lighthill–Ford theory of spontaneous imbalance and emission of inertia–gravity waves has been derived and applied on episodic and seasonal time scales. A scale analysis of this ...

John A. Knox; Donald W. McCann; Paul D. Williams

2008-10-01T23:59:59.000Z

408

Comparison of Regional Clear-Sky Albedos Inferred from Satellite Observations and Model Computations  

Science Conference Proceedings (OSTI)

We have taken an important first step in validating climate models by comparing model and satellite inferred clear sky TOA (top-of-atmosphere) albedos. Model albodos were computed on a 1° × 1° latitude-longitude grid, allowing for variations in ...

B. P. Briegleb; P. Minnis; V. Ramanathan; E. Harrison

1986-02-01T23:59:59.000Z

409

An Investigation of a Commercial Aircraft Encounter with Severe Clear-Air Turbulence over Western Greenland  

Science Conference Proceedings (OSTI)

This study presents digital flight data recorder (DFDR) analyses and high-resolution numerical simulations relevant to a severe clear-air turbulence (CAT) encounter over western Greenland by a Boeing 777 aircraft at 10-km elevation at 1305 UTC 25 ...

R. D. Sharman; J. D. Doyle; M. A. Shapiro

2012-01-01T23:59:59.000Z

410

Biodiesel Clears the Air in Underground Mines, Clean Cities, Fact Sheet, June 2009  

DOE Green Energy (OSTI)

Mining companies are using biodiesel in their equipment to help clear the air of diesel particulate matter (DPM). This action improves air quality and protects miners' lungs. Though using biodiesel has some challenges in cold weather, tax incentives, and health benefits make it a viable option.

Not Available

2009-06-01T23:59:59.000Z

411

Cloudy Sky Version of Bird's Broadband Hourly Clear Sky Model (Presentation)  

DOE Green Energy (OSTI)

Presentation on Bird's Broadband Hourly Clear Sky Model given by NREL's Daryl Myers at SOLAR 2006. The objective of this report is to produce ''all sky'' modeled hourly solar radiation. This is based on observed cloud cover data using a SIMPLE model.

Myers, D.

2006-08-01T23:59:59.000Z

412

Solar Irradiance Anomalies Caused by Clear-Sky Transmission Variations above Mauna Loa: 1958–99  

Science Conference Proceedings (OSTI)

The clear-sky transmission of the atmosphere contributes to determining the amount of solar irradiance that reaches various levels in the atmosphere, which in turn is fundamental to defining the climate of the earth. As of the end of 1999, ...

Ellsworth G. Dutton; Barry A. Bodhaine

2001-08-01T23:59:59.000Z

413

show that hardly any commercial enhancement program can be regarded as clearly successful.  

E-Print Network (OSTI)

show that hardly any commercial enhancement program can be regarded as clearly successful. Model buoyant plate and into the hotter part of the mantle. Ventilation connects the atmosphere and ocean are formed in the surface mixed layer and acquire their characteristics through the ex- change of heat

Williams, Ric

414

Clear-Sky Longwave Irradiance at the Earth’s Surface—Evaluation of Climate Models  

Science Conference Proceedings (OSTI)

An evaluation of the clear-sky longwave irradiance at the earth’s surface (LI) simulated in climate models and in satellite-based global datasets is presented. Algorithm-based estimates of LI, derived from global observations of column water ...

J. R. Garratt

2001-04-01T23:59:59.000Z

415

Delayed-fission properties of neutron-deficient americium nuclei  

Science Conference Proceedings (OSTI)

Characteristics of the delayed-fission decay mode in light americium nuclei have been investigated. Measurements on the unknown isotopes {sup 230}Am and {sup 236}Am were attempted, and upper limits on the delayed-fission branches of these nuclei were determined. Evidence of the existence of {sup 236}Am was observed in radiochemical separations. Total kinetic energy and mass-yield distributions of the electron-capture delayed-fission mode were measured for {sup 232}Am (t{sub 1/2} = 1.31 {plus minus} 0.04 min) and for {sup 234}Am (t{sub 1/2} = 2.32 {plus minus} 0.08 min), and delayed-fission probabilities of 6.9 {times} 10{sup {minus}4} and 6.6 {times} 10{sup {minus}5}, respectively, were determined. The total kinetic energy and the asymmetric mass-yield distributions are typical of fission of mid-range actinides. No discernible influence of the anomalous triple-peaked mass division characteristic of the thorium-radium region was detected. Measurements of the time correlation between the electron-capture x-rays and the subsequent fission conform that the observed fissions arise from the electron-capture delayed-fission mechanism. Delayed fission has provided a unique opportunity to extend the range of low-energy fission studies to previously inaccessible regions. 71 refs., 44 figs., 13 tabs.

Hall, H.L. (California Univ., Berkeley, CA (USA). Dept. of Chemistry)

1989-10-23T23:59:59.000Z

416

On Interference Networks with Feedback and Delayed CSI  

E-Print Network (OSTI)

The degrees of freedom (DoF) region of the two-user MIMO interference channel (IC) is completely characterized in the presence of noiseless channel output feedback from each receiver to its respective transmitter and with the assumption of delayed channel state information (CSI) at the transmitters. It is shown that having output feedback and delayed CSI at the transmitters can strictly enlarge the DoF region when compared to the case in which only delayed CSI is available at the transmitters. The proposed coding schemes that achieve the corresponding DoF region with feedback and delayed CSI utilize both resources, i.e., feedback and delayed CSI in a non-trivial manner. Furthermore, cases are identified in which output feedback and delayed CSI alone are sufficient to achieve the DoF region achievable with perfect, instantaneous CSI. Also, the DoF region of the scalar 2x2x2 two-hop interference network is characterized. It is shown that the total DoF for this network collapses from 2 (with perfect, instantaneo...

Tandon, Ravi; Poor, H Vincent; Shamai, Shlomo

2011-01-01T23:59:59.000Z

417

Fault diagnosis of regenerative water heater based-on multi-class support vector machines  

Science Conference Proceedings (OSTI)

The main idea of multi-class support vector machines (SVMs) is described. a multi-class model for regenerative water heater fault diagnosis is presented combining the fuzzy logic and SVMs. The typical faults set of regenerative water heater is built ... Keywords: fault diagnosis, fuzzy rules, regenerative water heater, steam turbine, support vector machines

Lei Wang; Rui-Qing Zhang

2009-08-01T23:59:59.000Z

418

Ant Colony Clustering Procedure Used in Vibration Fault Diagnosis of Beam Pumping Unit  

Science Conference Proceedings (OSTI)

The study of vibration fault diagnosis of beam pumping unit is an important task to reasonable production, scientific management and improvement of the oil recovery. The vibration fault diagnosis is a good method with direct result. In view of measurement ... Keywords: ant colony algorithm, clustering procedure, beam pumping unit, fault, diagnosis

Wuguang Li; Shenglai Yang; Ranran Xu; Xiaoxu Sun; Xing Zhang

2011-10-01T23:59:59.000Z

419

Modeling and experimental validation of internal faults in salient pole synchronous machines including space harmonics  

Science Conference Proceedings (OSTI)

Considering the space harmonics caused by the faulted windings, a simulation model of internal faults in salient pole synchronous machines is proposed in this paper. The model is based on the winding function approach, which makes no assumption for sinusoidal ... Keywords: Internal faults, Space harmonics, Synchronous machines, Winding function

X. Tu; L. -A. Dessaint; M. El Kahel; A. Barry

2006-06-01T23:59:59.000Z

420

A Survey of NASA and Military Standards on Fault Tolerance and Reliability Applied to Robotics  

E-Print Network (OSTI)

. There are Hand­ books (Reliability of Electronic Equipment [7], MIL­HDBK­217F, Fault Tree Handbook [25], NUREG Com­ mission as NUREG­0492, the Fault Tree Hand­ book [25]. 2.2 Parts Specifications In addition and Mission Quality, Washington, DC, April 1991. [25] NUREG­0492. Fault Tree Handbook. Technical report

Rice University - Center for Cooperative Autonomous Robots for Hazardous Environments

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Power Transformer Fault Diagnosis Based on Integrated of Rough Set Theory and Evidence Theory  

Science Conference Proceedings (OSTI)

When using chromatography data analysis in diagnosis of power transformer fault, fault information cannot be make full use, which can't effectively discover knowledge hidden in data. In this paper a method integreted of rough set theory and evidence ... Keywords: Rough Set, Evidence Theory, Power Transformer, Fault Diagnosis

Zhou Ai-Hua, Yao Yi, Song Hong, Zeng Xiao-Hui

2013-01-01T23:59:59.000Z

422

Assessment of power-frequency based algorithms for fault location in power grids  

Science Conference Proceedings (OSTI)

The increased accuracy of the faults' location is a very actual request of the power grids' operation and management, reason to develop new and as precise as possible techniques for the estimation of the short-circuits' location. The actual fault locating ... Keywords: ATP simulation, fault location, power grids, power-frequency based algorithms

Marcel Istrate

2010-10-01T23:59:59.000Z

423

High impedance fault location in transmission line using nonlinear frequency analysis  

Science Conference Proceedings (OSTI)

The detection and location of high impedance faults on power system has been one of the most difficult problems in power transmission and distribution systems. According to a very highly nonlinear behavior of high impedance faults, a methodology is presented ... Keywords: high impedance fault, nonlinear frequency analysis, power line carrier, transmission line

Min-You Chen; Jin-Qian Zhai; Zi-Qiang Lang; Ju-Cheng Liao; Zhao-Yong Fan

2010-09-01T23:59:59.000Z

424

Dynamic behaviour of a DFIG wind turbine subjected to power system faults  

E-Print Network (OSTI)

Dynamic behaviour of a DFIG wind turbine subjected to power system faults Gabriele Michalke+, Anca of the dynamic interaction between variable speed DFIG wind turbines and the power system subjected to disturbances, such as short circuit faults. Focus of the paper is the fault ride-through capability of DFIG

425

A general noise-reduction framework for fault localization of Java programs  

Science Conference Proceedings (OSTI)

Context: Existing fault-localization techniques combine various program features and similarity coefficients with the aim of precisely assessing the similarities among the dynamic spectra of these program features to predict the locations of faults. ... Keywords: Fault localization, Key block chain, Noise reduction, Program debugging

Jian Xu; Zhenyu Zhang; W. K. Chan; T. H. Tse; Shanping Li

2013-05-01T23:59:59.000Z

426

A SVDD approach of fuzzy classification for analog circuit fault diagnosis with FWT as preprocessor  

Science Conference Proceedings (OSTI)

In this paper, a new approach of fault diagnosis in analog circuits, which employs the Fractional Wavelet Transform (FWT) to extract fault features and adopts a fuzzy multi-classifier based on the Support Vector Data Description (SVDD) to diagnose circuit ... Keywords: Analog circuit, Fault diagnosis, Feature extraction, Fractional wavelet transform, KFCM, SVDD

Hui Luo; Youren Wang, Jiang Cui

2011-08-01T23:59:59.000Z

427

Current Practice and a Direction Forward in Checkpoint/Restart Implementations for Fault Tolerance  

Science Conference Proceedings (OSTI)

Checkpoint/restart is a general idea for which particular implementations enable various functionalities in computer systems, including process migration, gang scheduling, hibernation, and fault tolerance. For fault tolerance, in current practice, implementations ... Keywords: Fault tolerance, checkpoint/restart, autonomic computing, Linux

Jose Carlos Sancho; Fabrizio Petrini; Kei Davis; Roberto Gioiosa; Song Jiang

2005-04-01T23:59:59.000Z

428

Fault Diagnosis of Regenerative Water Heater Based-On Multi-class Support Vector Machines  

Science Conference Proceedings (OSTI)

The main idea of multi-class support vector machines (SVMs) is described. a multi-class model for regenerative water heater fault diagnosis is presented combining the fuzzy logic and SVMs. The typical faults set of regenerative water heater is built ... Keywords: steam turbine, regenerative water heater, fuzzy rules, support vector machines, fault diagnosis

Lei Wang; Rui-qing Zhang

2009-08-01T23:59:59.000Z

429

Fault conditions classification of automotive generator using an adaptive neuro-fuzzy inference system  

Science Conference Proceedings (OSTI)

In this paper, an adaptive neuro-fuzzy inference system (ANFIS) was proposed for condition monitoring and fault diagnosis of an automotive generator. Conventional fault indication of an automotive generator generally uses an indicator to inform the driver ... Keywords: Adaptive neuro-fuzzy inference system, Automotive generator, Discrete wavelet transform, Fault diagnosis system

Jian-Da Wu; Jun-Ming Kuo

2010-12-01T23:59:59.000Z

430

A CONTROLLER FOR HVAC SYSTEMS WITH FAULT DETECTION CAPABILITIES BASED ON SIMULATION MODELS  

E-Print Network (OSTI)

1 A CONTROLLER FOR HVAC SYSTEMS WITH FAULT DETECTION CAPABILITIES BASED ON SIMULATION MODELS T. I describes a control scheme with fault detection capabilities suitable for application to HVAC systems as a reference of correct operation. Faults that occur in the HVAC system under control cause the PI

431

Automatic fault diagnosis of internal combustion engine based on spectrogram and artificial neural network  

Science Conference Proceedings (OSTI)

This paper presents a signal analysis technique for internal combustion (IC) engine fault diagnosis based on the spectrogram and artificial neural network (ANN). Condition monitoring and fault diagnosis of IC engine through acoustic signal analysis is ... Keywords: acoustic analysis, fault diagnosis, internal combustion engine

Sandeep Kumar Yadav; Prem Kumar Kalra

2010-04-01T23:59:59.000Z

432

A systematic review of design diversity-based solutions for fault-tolerant SOAs  

Science Conference Proceedings (OSTI)

Context: Over recent years, software developers have been evaluating the benefits of both Service-Oriented Architecture and software fault tolerance techniques based on design diversity by creating fault-tolerant composite services that leverage ... Keywords: SLR, SOA, composite services, fault tolerance

Amanda S. Nascimento; Cecília M. F. Rubira; Rachel Burrows; Fernando Castor

2013-04-01T23:59:59.000Z

433

Solid-state fault current limiter for voltage sag mitigation and its parameters design  

Science Conference Proceedings (OSTI)

Due to the difficulty in electric distribution network reinforcement and the interconnection of more distributed generations, fault current level has become a serious problem in system operations. The utilization of solid-state fault current limiters ... Keywords: power quality, simulation, solid-state fault current limiter, voltage sag

B. Boribun; T. Kulworawanichpong

2010-07-01T23:59:59.000Z

434

Review article: Achieving maximum reliability in fault tolerant network design for variable networks  

Science Conference Proceedings (OSTI)

The objective of this paper is to present a novel method to achieve maximum reliability for fault tolerant optimal network design when network has variable size. Reliability calculation is most important and critical component when fault tolerant optimal ... Keywords: Fault tolerant optimal design, Fixed and varying link reliability, Maximizing reliability, Neural networks, Variable network size

B. Kaushik, N. Kaur, A. K. Kohli

2013-07-01T23:59:59.000Z

435

A systematic fuzzy rule based approach for fault classification in transmission lines  

Science Conference Proceedings (OSTI)

The paper presents a new approach for fault classification in transmission line using a systematic fuzzy rule based approach. Fault classification is one of the important requirements in distance relaying for identifying the accurate phases involved ... Keywords: DT-fuzzy rule base, Decision Tree, Distance relaying, Fault classification, Heuristic fuzzy system, S-transform, Wavelet transform

S. R. Samantaray

2013-02-01T23:59:59.000Z

436

Yemanja—A Layered Fault Localization System for Multi-Domain Computing Utilities  

Science Conference Proceedings (OSTI)

Yemanja is a model-based event correlation engine for multi-layer fault diagnosis. It targets complex propagating fault scenarios, and can smoothly correlate low-level network events with high-level application performance alerts related to quality-of-service ... Keywords: Problem determination, event correlation, fault and performance management, service level agreements

K. Appleby; G. Goldszmidt; M. Steinder

2002-06-01T23:59:59.000Z

437

Bearing fault prognosis based on health state probability estimation  

Science Conference Proceedings (OSTI)

In condition-based maintenance (CBM), effective diagnostic and prognostic tools are essential for maintenance engineers to identify imminent fault and predict the remaining useful life before the components finally fail. This enables remedial actions ... Keywords: Degradation stage, High pressure LNG pump, Prognosis, Remaining useful life (RUL), Support Vector Machine (SVM)

Hack-Eun Kim; Andy C. C. Tan; Joseph Mathew; Byeong-Keun Choi

2012-04-01T23:59:59.000Z

438

Fault tolerance using lower fidelity data in adaptive mesh applications  

Science Conference Proceedings (OSTI)

Many high performance scientific simulation codes use checkpointing for multiple reasons. In addition to having the flexibility to complete the simulation in multiple job submissions, it has also provided an adequate recovery mechanism up to the current ... Keywords: AMR, fault tolerance, flash

Anshu Dubey; Prateeti Mohapatra; Klaus Weide

2013-06-01T23:59:59.000Z

439

Hybrid simulation of large electrical networks with assymmetrical fault modelling  

Science Conference Proceedings (OSTI)

Owing to the increasing attention placed on dynamic security assessment in the light of recent blackouts, hybrid simulation, involving the interfacing of electromagnetic transients (EMT) simulators and transient stability (TS) simulators for the more ... Keywords: asymmetrical fault modelling, electromagnetic transients, hybrid simulation, interaction protocol, transient stability

H. T. Su; K. W. Chan; L. A. Snider

2008-03-01T23:59:59.000Z

440

Sensor Fault Detection in Power Plants Andrew Kusiak1  

E-Print Network (OSTI)

and Soroush 2003 . Any false reading could lead to di- sastrous outcomes. In a coal-fired power plant, faultySensor Fault Detection in Power Plants Andrew Kusiak1 and Zhe Song2 Abstract: This paper presents approach handles data from temporal processes by periodic updates of the knowledge base. An industrial

Kusiak, Andrew

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

A fault-tolerant strategy for virtualized HPC clusters  

Science Conference Proceedings (OSTI)

Virtualization is a common strategy for improving the utilization of existing computing resources, particularly within data centers. However, its use for high performance computing (HPC) applications is currently limited despite its potential for both ... Keywords: Benchmark, Checkpointing, Fault-tolerance, MPI, Virtualization

John Paul Walters; Vipin Chaudhary

2009-12-01T23:59:59.000Z

442

Conditional edge-fault-tolerant Hamiltonicity of dual-cubes  

Science Conference Proceedings (OSTI)

The dual-cube is an interconnection network for linking a large number of nodes with a low node degree. It uses low-dimensional hypercubes as building blocks and keeps the main desired properties of the hypercube. A dual-cube DC(n) has n+1 links per ... Keywords: Conditional fault-tolerant, Dual-cubes, Hamiltonian cycle, Hypercube, Interconnection network

Jheng-Cheng Chen; Chang-Hsiung Tsai

2011-02-01T23:59:59.000Z

443

Modeling of switching operations using fault matrix method  

Science Conference Proceedings (OSTI)

Switching operations in energy supply networks are either modeled by adding or removing artificial nodes which results in state dependent grid topology or by setting the switch impedance to high or low value. This procedure is not very accurate and can ... Keywords: admittance matrix, fault matrix method, power system, switching operation, transmission lines

Martin Wolter; Bernd R. Oswald

2007-05-01T23:59:59.000Z

444

Dominant Feature Identification for Industrial Fault Detection and Isolation Applications  

Science Conference Proceedings (OSTI)

Fault Detection and Isolation (FDI) is crucial to reduce production costs and down-time in industrial machines. In this paper, we show how to find a reduced feature subset which is optimal in both estimation and clustering least square errors using a ... Keywords: Least Square Error (LSE), Neural Network (NN), Principal Component Analysis (PCA), Principal Feature Analysis (PFA), Singular Value Decomposition (SVD)

Jun-Hong Zhou; Chee Khiang Pang; Frank L. Lewis; Zhao-Wei Zhong

2011-08-01T23:59:59.000Z

445

Using Write Protected Data Structures To Improve Software Fault Tolerance  

E-Print Network (OSTI)

Using Write Protected Data Structures To Improve Software Fault Tolerance in Highly Available critical DBMS data structures against software errors. Guarding (write-protecting) DBMS data improves protection to new data structures very easy. To implement the expose segment update model in Sprite, we

California at Irvine, University of

446

RIS-M-2326 FAULT TREE AND CAUSE CONSEQUENCE ANALYSIS  

E-Print Network (OSTI)

and control, nuclear reactor safety systems and aircraft landing systems. For systems of failure in operations. For example a nuclear reactor shutdown system should fail at a rate which Abstract. A theory underlying application of automatic fault tree analysis to computer programs

447

Distributed Fault Diagnosis Using Bayesian Reasoning in MAGNETO  

Science Conference Proceedings (OSTI)

Many of the emerging telecom services make use of Outer Edge Networks, in particular Home Area Networks. The configuration and maintenance of such services may not be under full control of the telecom operator which still needs to guarantee the service ... Keywords: Bayesian inference, distributed fault diagnosis, outer edge, agents, self-learning

Pablo Arozarena; Raquel Toribio; Alvaro Carrera

2011-10-01T23:59:59.000Z

448

Differential energy based microgrid protection against fault conditions  

Science Conference Proceedings (OSTI)

A differential energy based fault protection in microgrid is presented in this paper. Initially the currents at the respective buses are retrieved and processed through a novel time-frequency transform known as S-transform to generate time-frequency ...

S. R. Samantaray; Geza Joos; I. Kamwa

2012-01-01T23:59:59.000Z

449

IEEE TRANSACTION ON COMPUTERS 1 Adaptive Fault Management of Parallel  

E-Print Network (OSTI)

of high performance computing (HPC) continues to grow, application fault resilience becomes crucial- tions, High performance computing, Large-scale systems. I. INTRODUCTION IN the field of high performance Performance Computing Zhiling Lan, Member, IEEE, and Yawei Li, Student Member, IEEE Abstract--As the scale

Lan, Zhiling

450

Embedded holonic fault diagnosis of complex transportation systems  

Science Conference Proceedings (OSTI)

The use of electronic equipment and embedded computing technologies in modern complex transportation systems continues to grow in a highly competitive market, in which product maintainability and availability is vital. These technological advances also ... Keywords: Cooperative fault diagnosis, Corrective maintenance, Embedded diagnosis, Holonic architecture, Model-based diagnosis, Railway transportation system

Antoine Le Mortellec; Joffrey Clarhaut; Yves Sallez; Thierry Berger; Damien Trentesaux

2013-01-01T23:59:59.000Z

451

Critique of Fault-Tolerant Quantum Information Processing  

E-Print Network (OSTI)

This is a chapter in a book \\emph{Quantum Error Correction} edited by D. A. Lidar and T. A. Brun, and published by Cambridge University Press (2013)\\\\ (http://www.cambridge.org/us/academic/subjects/physics/quantum-physics-quantum-information-and-quantum-computation/quantum-error-correction)\\\\ presenting the author's view on feasibility of fault-tolerant quantum information processing.

Robert Alicki

2013-10-31T23:59:59.000Z

452

Fault trees for decision making in systems analysis  

SciTech Connect

The application of fault tree analysis (FTA) to system safety and reliability is presented within the framework of system safety analysis. The concepts and techniques involved in manual and automated fault tree construction are described and their differences noted. The theory of mathematical reliability pertinent to FTA is presented with emphasis on engineering applications. An outline of the quantitative reliability techniques of the Reactor Safety Study is given. Concepts of probabilistic importance are presented within the fault tree framework and applied to the areas of system design, diagnosis and simulation. The computer code IMPORTANCE ranks basic events and cut sets according to a sensitivity analysis. A useful feature of the IMPORTANCE code is that it can accept relative failure data as input. The output of the IMPORTANCE code can assist an analyst in finding weaknesses in system design and operation, suggest the most optimal course of system upgrade, and determine the optimal location of sensors within a system. A general simulation model of system failure in terms of fault tree logic is described. The model is intended for efficient diagnosis of the causes of system failure in the event of a system breakdown. It can also be used to assist an operator in making decisions under a time constraint regarding the future course of operations. The model is well suited for computer implementation. New results incorporated in the simulation model include an algorithm to generate repair checklists on the basis of fault tree logic and a one-step-ahead optimization procedure that minimizes the expected time to diagnose system failure. (80 figures, 20 tables) (auth)

Lambert, H.E.

1975-10-01T23:59:59.000Z

453

Microstructures and Rheology of a Limestone-Shale Thrust Fault  

E-Print Network (OSTI)

The Copper Creek thrust fault in the southern Appalachians places Cambrian over Ordovician sedimentary strata. The fault accommodated displacement of 15-20 km at 100-180 °C. Along the hanging wall-footwall contact, microstructures within a ~2 cm thick calcite and shale shear zone suggest that calcite, not shale, controlled the rheology of the shear zone rocks. While shale deformed brittley, plasticity-induced fracturing in calcite resulted in ultrafine-grained (shale into the shear zone, shows the evolution of rheology within the shear zone. Sedimentary laminations 1 cm below the shear zone are cut by minor faults, stylolites, and fault-parallel and perpendicular calcite veins. At vein intersections, calcite grain size is reduced (to ~0.3 ?m), and microstructures include inter-and-intragranular fractures, four-grain junctions, and interpenetrating boundaries. Porosity rises to 6 percent from shale clasts (5-350 ?m) lie within an ultrafine-grained calcite (shale matrix. Ultrafinegrained calcite (shale. Calcite vein microstructures suggest veins continued to form during deformation. Fractures at twin-twin and twin-grain boundary intersections suggest grain size reduction by plasticity-induced fracturing, resulting in <1 ?m grains. Interpenetrating boundaries, four-grain junctions, and no LPO indicate the ultrafine-grained calcite deformed by viscous grain boundary sliding. The evolution of the ultrafine-grain shear zone rocks by a combination of plastic and brittle processes and the deformation of the interconnected network of ultrafine-grained calcite by viscous GBS enabled a large displacement along a narrow fault zone.

Wells, Rachel Kristen

2010-12-01T23:59:59.000Z

454

Absolute dating of brittle fault movements: Late Permian and late Jurassic extensional fault breccias in western Norway  

E-Print Network (OSTI)

events has ad- vanced significantly since the quintes- sential fault-rock classification schemes metamorphosed, allochthonous units with broadly Ordovician, white-mica cooling ages. On AtlĂąy, the NSD was cut) and from the palaeomagnetic study of Torsvik et al. (1992) (`Site' prefixes). Paper 128 Disc #12

Andersen, Torgeir Bjørge

455

Compound and Elemental Analysis At Clear Lake Area (Thompson, Et Al., 1992)  

Open Energy Info (EERE)

Et Al., 1992) Et Al., 1992) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Compound and Elemental Analysis At Clear Lake Area (Thompson, Et Al., 1992) Exploration Activity Details Location Clear Lake Area Exploration Technique Compound and Elemental Analysis Activity Date Usefulness useful DOE-funding Unknown Notes Based on the above discussion, we favor a model in which thermal water rises somewhere between Howard and Seigler Springs. At Howard Springs we see evidence for the most representative deep thermal water because the C1 is elevated (highest measured C1 concentrations occur at Howard Springs). Moreover, the Na-Li, Na-K and Na-K-Ca geothermometers suggest temperatures greater than 240 degrees C. References J. M. Thompson, R. H. Mariner, L. D. White, T. S. Presser, W. C.

456

Operation Redwing. Project 1. 10. Blast over vegetated and cleared areas  

SciTech Connect

Measurements were made to determine the difference in blast effects over a surface covered with low shrubs and grass and over a cleared sandy surface in the precursor region, and an attempt was made to correlate this difference with measurements of preshock sound speed over the surface. Overpressure was measured with ground-baffle gages and with pivot-static gages at 3-foot elevations. Dynamic pressures were measured at the 3-foot elevation with the same gages. Measurements were made at the same ground ranges for vegetated surface as for the sandy surface. The vegetation reduced the severity of the precursor, showing later arrival times and smaller dynamic pressures than over the cleared area. The overpressures over the vegetation were the same at the ground and 3-foot levels. No measurements of sound speed after zero time were obtained, so a correlation is not possible.

Broyles, C.D.

1985-09-01T23:59:59.000Z

457

On the Estimation of Clear-Sky Upwelling Shortwave and Longwave  

SciTech Connect

Previous work (Long and Ackerman 2000; Long 2004) has concentrated on estimation of the downwelling clear-sky irradiances and the calculation of the effect of clouds on the downwelling radiative energy budget. However, cloud forcing is defined for the difference between clear- and cloudy-sky net radiation, which includes the upwelling components. Thus, if we are to estimate the surface radiative cloud forcing, the means must be developed to estimate what the upwelling shortwave and longwave irradiance would be if the clouds were not present. Estimation of the upwelling longwave (LW) is particularly troublesome in that the emitted upwelling LW is a function of the total surface energy exchange including latent and sensible heat, which is related to but not necessarily always totally driven by the radiative exchange alone, but also involves the evolving soil and vegetation properties and changes in soil moisture amounts.

Long, C.N.

2005-03-18T23:59:59.000Z

458

ClearEdge Power formerly Quantum Leap Technology | Open Energy Information  

Open Energy Info (EERE)

ClearEdge Power formerly Quantum Leap Technology ClearEdge Power formerly Quantum Leap Technology Jump to: navigation, search Name ClearEdge Power (formerly Quantum Leap Technology) Place Hillsboro, Oregon Zip 97124 Sector Hydro, Hydrogen Product Develops small scale (~2.0kW) hydrogen fuel cells using silicon wafers. Coordinates 43.651735°, -90.341144° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.651735,"lon":-90.341144,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

459

Analysis of Fault Permeability Using Mapping and Flow Modeling, Hickory Sandstone Aquifer, Central Texas  

Science Conference Proceedings (OSTI)

Reservoir compartments, typical targets for infill well locations, are commonly created by faults that may reduce permeability. A narrow fault may consist of a complex assemblage of deformation elements that result in spatially variable and anisotropic permeabilities. We report on the permeability structure of a km-scale fault sampled through drilling a faulted siliciclastic aquifer in central Texas. Probe and whole-core permeabilities, serial CAT scans, and textural and structural data from the selected core samples are used to understand permeability structure of fault zones and develop predictive models of fault zone permeability. Using numerical flow simulation, it is possible to predict permeability anisotropy associated with faults and evaluate the effect of individual deformation elements in the overall permeability tensor. We found relationships between the permeability of the host rock and those of the highly deformed (HD) fault-elements according to the fault throw. The lateral continuity and predictable permeability of the HD fault elements enhance capability for estimating the effects of subseismic faulting on fluid flow in low-shale reservoirs.

Nieto Camargo, Jorge E., E-mail: jorge.nietocamargo@aramco.com; Jensen, Jerry L., E-mail: jjensen@ucalgary.ca [University of Calgary, Department of Chemical and Petroleum Engineering (Canada)

2012-09-15T23:59:59.000Z

460

Locating an active fault zone in Coso geothermal field by analyzing seismic  

Open Energy Info (EERE)

Locating an active fault zone in Coso geothermal field by analyzing seismic Locating an active fault zone in Coso geothermal field by analyzing seismic guided waves from microearthquake data Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Locating an active fault zone in Coso geothermal field by analyzing seismic guided waves from microearthquake data Details Activities (1) Areas (1) Regions (0) Abstract: Active fault systems usually provide high-permeability channels for hydrothermal outflow in geothermal fields. Locating such fault systems is of a vital importance to plan geothermal production and injection drilling, since an active fault zone often acts as a fracture-extensive low-velocity wave guide to seismic waves. We have located an active fault zone in the Coso geothermal field, California, by identifying and analyzing

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Active Fault Controls At High-Temperature Geothermal Sites- Prospecting For  

Open Energy Info (EERE)

Page Page Edit History Facebook icon Twitter icon » Active Fault Controls At High-Temperature Geothermal Sites- Prospecting For New Faults Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Paper: Active Fault Controls At High-Temperature Geothermal Sites- Prospecting For New Faults Details Activities (1) Areas (1) Regions (0) Abstract: Our previous studies found spatial associations between seismically active faults and high-temperature geothermal resources in the western Basin and Range, suggesting that recency of fault movement may be a useful criterion for resource exploration. We have developed a simple conceptual model in which recently active (Holocene) faults are preferred conduits for migration of thermal water from deep crustal depths, and we

462

Continuous-time nonlinear model predictive control of time-delayed Wiener-type systems  

Science Conference Proceedings (OSTI)

This paper deals with a novel method of continuous-time model predictive control for nonlinear time-delayed systems. The problems regarding time delays are solved by incorporating delayed and undelayed model outputs in the control-law derivation. Nonlinear-mapping ... Keywords: Wiener-type model, continuous system, nonlinear predictive control, time-delayed system

Simon Oblak; Igor Škrjanc

2006-02-01T23:59:59.000Z

463

Routing Algorithms for Delay-insensitive and Delay-sensitive Applications in Underwater Sensor Networks  

E-Print Network (OSTI)

Underwater sensor networks consist of sensors and vehicles deployed to perform collaborative monitoring tasks over a given region. Underwater sensor networks will find applications in oceanographic data collection, pollution monitoring, offshore exploration, disaster prevention, assisted navigation, tactical surveillance, and mine reconnaissance. Underwater acoustic networking is the enabling technology for these applications. In this paper, an architecture for three-dimensional underwater sensor networks is considered, and a model characterizing the acoustic channel utilization efficiency is introduced, which allows investigating some fundamental characteristics of the underwater environment. In particular, the model allows setting the optimal packet size for underwater communications given monitored volume, density of the sensor network, and application requirements. Moreover, the problem of data gathering is investigated at the network layer by considering the cross-layer interactions between the routing functions and the characteristics of the underwater acoustic channel. Two distributed routing algorithms are introduced for delay-insensitive and delaysensitive applications. The proposed solutions allow each node to select its next hop, with the objective of minimizing the energy consumption taking the varying condition of the underwater channel and the different application requirements into account. The proposed routing solutions are shown to achieve the performance targets by means of simulation.

Dario Pompili; Tommaso Melodia; Ian F. Akyildiz

2006-01-01T23:59:59.000Z

464

Pulsed Photofission Delayed Gamma Ray Detection for Nuclear Material Identification  

SciTech Connect

Innovative systems with increased sensitivity and resolution are in great demand to detect diversion and to prevent misuse in support of nuclear materials management for the U.S. fuel cycle. Nuclear fission is the most important multiplicative process involved in non-destructive active interrogation. This process produces the most easily recognizable signature for nuclear materials. High-energy gamma rays can also excite a nucleus and cause fission through a process known as photofission. After photofission reactions, delayed signals are easily distinguishable from the interrogating radiation. Linac-based, advanced inspection techniques utilizing the fission signals after photofission have been extensively studied for homeland security applications. Previous research also showed that a unique delayed gamma ray energy spectrum exists for each fissionable isotope. Isotopic composition measurement methods based on delayed gamma ray spectroscopy will be the primary focus of this work.

John Kavouras; Xianfei Wen; Daren R. Norman; Dante R. Nakazawa; Haori Yang

2012-11-01T23:59:59.000Z

465

Time delays across saddles as a test of modified gravity  

E-Print Network (OSTI)

Modified gravity theories can produce strong signals in the vicinity of the saddles of the total gravitational potential. In a sub-class of these models this translates into diverging time-delays for echoes crossing the saddles. Such models arise from the possibility that gravity might be infrared divergent or confined, and if suitably designed they are very difficult to rule out. We show that Lunar Laser Ranging during an eclipse could probe the time-delay effect within meters of the saddle, thereby proving or excluding these models. Very Large Baseline Interferometry, instead, could target delays across the Jupiter-Sun saddle. Such experiments would shed light on the infrared behaviour of gravity and examine the puzzling possibility that there might be well-hidden regions of strong gravity and even singularities inside the solar system.

Joao Magueijo; Ali Mozaffari

2012-12-15T23:59:59.000Z

466

Gels under stress: the origins of delayed collapse  

E-Print Network (OSTI)

Attractive colloidal particles can form a disordered elastic solid or gel when quenched into a two-phase region, if the volume fraction is sufficiently large. When the interactions are comparable to thermal energies the stress-bearing network within the gel restructures over time as individual particle bonds break and reform. Typically, under gravity such weak gels show a prolonged period of either no or very slow settling, followed by a sudden and rapid collapse - a phenomenon known as delayed collapse. The link between local bond breaking events and the macroscopic process of delayed collapse is not well understood. Here we summarize the main features of delayed collapse and discuss the microscopic processes which cause it. We present a plausible model which connects the kinetics of bond breaking to gel collapse and test the model by exploring the effect of an applied external force on the stability of a gel.

Lisa J. Teece; James M. Hart; Kerry Yen Ni Hsu; Malcolm A. Faers; Paul Bartlett

2013-09-30T23:59:59.000Z

467

Delayed neutron measurements from fast fission of actinide waste isotopes  

E-Print Network (OSTI)

A study was performed to determine the delayed neutron emission properties from fast fission of several actinide waste isotopes. The specific isotopes evaluated were U-235, Np-237, and Am-243. A calculational technique based on the microscopic method was used to predict initial guesses for the delayed neutron parameters (group decay constants and yields). Based on these calculations, an alternate "seven-group" structure, in contrast to the traditional "six-group" structure used previously, was suggested which would yield a superior fit to the measured data. A series of measurements were performed to test the hypothesis suggested by this alternate group structure. Using a set of highly purified actinide samples (provided by Oak Ridge National Laboratory), the delayed neutron emission decay constants and yields for six groups of the "seven-group" structure were measured for U-235, Np-237, and Am-243. These experiments were performed using the Texas A&M University Nuclear Science Center Reactor, a quick pneumatic transfer system, an integrated computer control and counting system, and a specially designed in-core irradiation device. The values for the total delayed neutron yield (per 100 fissions) from fast-neutron induced fission of U-235, Np237, and Am-243 were determined to be 1.67 ?0.08, 1.14 ?0.07, 0.86 ?0.05, respectively. The newly measured values were compared with other values recommended by Keepin et al., Waldo et al., Saleh et al., and Brady and England. Good agreement was found in all cases. The "seven-group" structure was shown to yield a superior fit to the measured data, as well as, provide a more direct correlation between delayed neutron groups and their associated delayed neutron precursors.

Charlton, William S.

1997-01-01T23:59:59.000Z

468

Testing of 3-meter Prototype Fault Current Limiting Cables  

Science Conference Proceedings (OSTI)

Two 3-m long, single-phase cables have been fabricated by Ultera from second generation (2G) superconductor supplied by American Superconductor. The first cable was made with two layers of 2G tape conductor and had a critical current of 5,750 A while the second cable had four layers and a critical current of 8,500 A. AC loss was measured for both cables at ac currents of up to 4 kArms. Ultera performed initial fault current studies of both cables in Denmark with limited currents in the range from 9.1 to 44 kA. Results from these tests will provide a basis for a 25-m long, three-phase, prototype cable to be tested at ORNL early next year and a 300-m long, fault current limiting, superconducting cable to be installed in a ConEd substation in New York City.

Gouge, Michael J [ORNL; Duckworth, Robert C [ORNL; Demko, Jonathan A [ORNL; Rey, Christopher M [ORNL; Thompson, James R [ORNL; Lindsay, David T [ORNL; Tolbert, Jerry Carlton [ORNL; Willen, Dag [Ultera; Lentge, Heidi [Ultera; Thidemann, Carsten [Ultera; Carter, Bill [AMSC

2009-01-01T23:59:59.000Z

469

V.: Security considerations in space and delay tolerant networks  

E-Print Network (OSTI)

This paper reviews the Internet-inspired security work on delay tolerant networking, in particular, as it might apply to space missions, and identifies some challenges arising, for both the Internet security community and for space missions. These challenges include the development of key management schemes suited for space missions as well as a characterization of the actual security requirements applying. A specific goal of this paper is therefore to elicit feedback from space mission IT specialists in order to guide the development of security mechanisms for delay tolerant networking. 1.

Stephen Farrell; Vinny Cahill

2006-01-01T23:59:59.000Z

470

Tectonic controls on magmatism in The Geysers--Clear Lake region: Evidence from new geophysical models  

DOE Green Energy (OSTI)

In order to study magmatism and geothermal systems in the Geysers-Clear Lake region, the authors developed a detailed three-dimensional tomographic velocity model based on local earthquakes. This high-resolution model resolves the velocity structure of the crust in the region to depths of approximately 12 km. The most significant velocity contrasts in The Geysers-Clear Lake region occur in the steam production area, where high velocities are associated with a Quaternary granite pluton, and in the Mount Hannah region, where low velocities occur in a 5-km-thick section of Mesozoic argillites. In addition, a more regional tomographic model was developed using traveltimes from earthquakes covering most of northern California. This regional model sampled the whole crust, but at a lower resolution than the local model. No large silicic magma chamber is noted in either the local or regional tomographic models. A three-dimensional gravity model also has ben developed in the area of the tomographic imaging. The gravity model demonstrates that all density contrasts can be accounted for in the upper 5--7 km of the crust. Two-dimensional magnetotelluric models of data from a regional east-west profile indicate high resistivities associated with the granitic pluton in The Geysers production area and low resistivities in the low-velocity section of Mesozoic argillites near Mount Hannah. No indication of midcrustal magma bodies is present in the magnetotelluric data. The geophysical models, seismicity patterns, distribution of volcanic vents, heat flow, and other data indicate that small, young intrusive bodies that were injected along a northeast trend from The Geysers to Clear Lake probably control the thermal regime.

Stanley, W.D.; Benz, H.M.; Villasenor, A.; Rodriguez, B.D. [Geological Survey, Denver, CO (United States). Denver Federal Center] [Geological Survey, Denver, CO (United States). Denver Federal Center; Walters, M.A. [CalEnergy Corp., Ridgecrest, CA (United States)] [CalEnergy Corp., Ridgecrest, CA (United States)

1998-09-01T23:59:59.000Z

471

Brief paper: Delay-dependent robust H? filtering for uncertain discrete-time singular systems with interval time-varying delay  

Science Conference Proceedings (OSTI)

This paper focuses on the delay-dependent robust H"~ filtering for uncertain discrete-time singular systems with interval time-varying delay. The uncertainty considered is a convex compact set of polytopic type. The purpose is the design of a linear ... Keywords: Discrete-time singular systems, Interval time-varying delay, Linear matrix inequality, Robust H? filter

Jong Hae Kim

2010-03-01T23:59:59.000Z

472

Age and magnitude of dip-slip faulting deduced from differential cooling histories: An example from the Hope fault, northwest Montana  

Science Conference Proceedings (OSTI)

Determination of the age of fault motion poses a challenge in tectonics, yet rarely produces satisfactory results. The authors describe a new method in which the age and magnitude of dip-slip faulting are estimated from contrasting cooling histories of footwall and hanging wall rocks adjacent to the Hope fault, northwest Montana. The Hope fault has been interpreted in the past as a mostly right-slip fault. New kinematic data, {sup 40}Ar/{sup 39}Ar thermochronometry, and geobarometry indicate that cooling of footwall rocks at {approximately}40 Ma resulted from dip-slip movement. This movement caused vertical separation of about 3 to 5 km between footwall and hanging wall rocks, suggesting that a minimum dip-slip component of 4 km developed during the Late Eocene. These results indicate that the Hope fault experienced substantial normal slip in the Late Eocene, making it coeval with other normal and detachment-style faults in the northern U.S. Cordillera. The western Lewis and Clark line, which in part may share a common tectonic history with the Hope fault, should be re-evaluated for its role in transferring Tertiary extension between the Priest River and Bitterroot core complexes. 45 refs., 10 figs., 1 tab.

Fillipone, J.A.; Yin, An; Harrison, T.M. [Univ. of California, Los Angeles, CA (United States)] [and others

1995-03-01T23:59:59.000Z

473

An economic analysis of a large scale ashe juniper clearing project in the Leon River watershed  

E-Print Network (OSTI)

Ashe Juniper (Juniperus ashei) is native to the Edwards Plateau in central Texas. In the past 150 years, however, this species has rapidly increased in abundance within its range. Reduced fire frequency and increased livestock grazing, are two factors attributed to the rapid rate of juniper encroachment. While the losses associated with brush encroachment are recognized, many ranchers lack the funds necessary to implement management practices to reduce juniper densities on their property. The high cost associated with clearing brush has led to the creation of cost-share programs, which help offset the expenses incurred by participating landowners. The Leon River Restoration Project (LRRP), implemented on private lands within Coryell and Hamilton Counties, Texas, is one such cost-share program. Funding for the LRRP is received through non-programmatic sources, in the form of grants, from various state and federal organizations and agencies. The Natural Resources Conservation Service (NRCS) provides a second source of funding through the Environmental Quality Incentives Program (EQIP). Participants contracted through LRRP funds receive 85% cost-share benefits, up to a maximum of $15,000. Landowners participating in the LRRP under EQIP funds receive 50% cost-share incentives, up to a maximum of $250,000. The purpose of this study was to record changes that occurred on land enrolled in the LRRP, following juniper removal, and the economic benefits recognized by this work. Thirty landowners scheduled to participate in the LRRP were interviewed in 2003, prior to juniper control work. In 2006, 23 of the original 30 landowners participated in a second interview, following their completion of brush removal work. Changes attributed to juniper removal were recorded during these post-clearing interviews. Stocking rate changes were used as the basis for measuring economic benefits recognized by the clearing efforts. Changes in hunting or grazing lease rates resulting from juniper clearing were also used to monitor economic benefits of the brushwork. A second component of the study tested for differences in landowner satisfaction between LRRP participants enrolled under LRRP funds, and those contracted under EQIP funds. Importanceperformance matrixes were created to display satisfaction differences.

Flack, Rebecca Lynn

2007-05-01T23:59:59.000Z

474

Detachment Faulting and Geothermal Resources - An Innovative Integrated  

Open Energy Info (EERE)

Detachment Faulting and Geothermal Resources - An Innovative Integrated Detachment Faulting and Geothermal Resources - An Innovative Integrated Geological and Geophysical Investigation in Fish Lake Valley, Nevada Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title Detachment Faulting and Geothermal Resources - An Innovative Integrated Geological and Geophysical Investigation in Fish Lake Valley, Nevada Project Type / Topic 1 Recovery Act: Geothermal Technologies Program Project Type / Topic 2 Validation of Innovative Exploration Technologies Project Description This program is designed to provide valuable new subsurface information about one of the Nation's arguably most promising high-temperature geothermal targets. Until now, the Emigrant Geothermal Prospect has been tested by only shallow and relatively shallow thermal-gradient boreholes and a small number of exploration wells, all of which have lacked any detailed 2-D or 3-D structural context. The applicants propose to conduct an innovative integration of detailed 2- D and 3-D structural reconstructions (structural mapping and reflection/refraction source seismology integrated with available data).

475

Gravity and fault structures, Long Valley caldera, California  

DOE Green Energy (OSTI)

The main and catastrophic phase of eruption in Long Valley occurred 0.73 m.y. ago with the eruption of over 600 km/sup 3/ of rhyolitic magma. Subsequent collapse of the roof rocks produced a caldera which is now elliptical in shape, 32 km east-west by 17 km north-south. The caldera, like other large Quarternary silicic ash-flow volcanoes that have been studied by various workers, has a nearly coincident Bouguer gravity low. Earlier interpretations of the gravity anomaly have attributed the entire anomaly to lower density rocks filling the collapsed structure. However, on the basis of many additional gravity stations and supporting subsurface data from several new holes, a much more complex and accurate picture has emerged of caldera structure. From a three-dimensional inversion of the residual Bouguer gravity data we can resolve discontinuities that seem to correlate with extensions of pre-caldera faults into the caldera and faults associated with the ring fracture. Some of these faults are believed related to the present-day hydrothermal upflow zone and the zone of youngest volcanic activity within the caldera.

Carle, S.F.; Goldstein, N.E.

1987-07-01T23:59:59.000Z

476

Enhancement of power system transient stability using superconducting fault current limiters  

E-Print Network (OSTI)

Abstract|Transient stability investigations consist in studying the rotor oscillations of generators (electro-mechanic oscillations, 0.1-2 Hz) followed by a fault of large amplitude, e.g. short circuit. The goal is to indicate if the generators are capable to stay synchronous after a fault has occurred. The fault duration is one of the most important factors to be given an answer. In fact, the shorter the fault, the more the maintaining of synchronisation can be guaranteed. Now in case of a fault, a fault current limiter has an extremely fast current transition in comparison with electro-mechanic time constants. This implies a quasi-instantaneous elimination of the fault through a limitation of the current and consequently a better ability to maintain the synchronisation of the system. We recall, in a classic system the elimination of a fault, by opening a circuit breaker, is carried out in two or three cycles in the best case. We have here studied a simple, radial electric network con guration with a machine and an in nite network. The study covers simulations of di erent faults that can occur in a network and the consequences of the recovery time of the fault current limiter. I.

Marten Sjostrom; Rachid Cherkaoui

1999-01-01T23:59:59.000Z

477

Study of a Fault Analysis System for a Heat Supply Network Based on GIS  

E-Print Network (OSTI)

Conventional methods cannot satisfy the request of the layout and operation management in a heating system. The geographical information system (GIS) in a heat supply network can realize information conformity and information share roundly, which makes management of information improve to a new level in district heating. When fault of the heat supply network occurs, the traditional methods make fault reaction time long and the efficiency low, and enlarge the fault harm. The system of fault analysis in a heat supply network based on GIS mainly simulates and calculates according to various fault conditions. By selection of valve shut-off schemes in fault conditions and simulation of various fault conditions, the fault treatment scheme can be optimized. The results of simulation can be shown in the GIS graphics with the aid of advanced image display function of GIS. The application of this system brings great significance to heating system on the management enhancing, fault number-reducing, quick decision-making and influence area diminishing in case of fault.

Zou, P.; Liu, M.; Tang, H.; Wang, X.; Li, N.; Wang, W.

2006-01-01T23:59:59.000Z

478

Effects of burial history, rock ductility and recovery magnitude on inversion of normal faulted strata  

E-Print Network (OSTI)

Inversion of normal faults at different burial depths is studied using physical models constructed with rock and deformed at confining pressure. Models consist of a 1 cm thick limestone layer above a fault dipping 70° in a rigid medium, and are subjected to a two-stage deformation path of layer-parallel extension followed by coaxial contraction. To investigate the effects of burial depth and relative ductility on kinematics of inversion, five model suites were run in which confining pressure and recovery magnitudes were varied. In all models, a normal fault forms in the limestone during extension. Subsequent inversion is accommodated in the limestone by reverse slip on the normal fault, creation and movement along new reverse faults, and distributed fracturing and folding. The relative contribution of these mechanisms depends on the relative ductility of the rock and magnitude of inversion. Reverse slip on the normal fault and distributed fracturing occur during early stages of inversion and new reverse faults form at intermediate stages. During late stage inversion, strata with low mean ductility shorten primarily by reverse slip on the pre-existing normal fault, whereas strata with high mean ductility shorten by continued slip on reverse faults. Evidence for inversion is provided by superposed fracture fabrics in the footwall at early stages (100% recovery). This change in fracture fabric during inversion could lead to an overpressured footwall in natural inversion structures. Reverse reactivation of the normal faults may occur during coaxial contraction even though such faults are unfavorably oriented assuming typical rock friction behavior and a homogeneous stress state. Localized reverse slip on normal faults is favored when strata display low ductility and less favored when strata work-harden during extension, however, the models show that the final inversion geometry is dependent on the ductility during both phases of deformation. Even a fault that is work-hardened during extension can reactivate if the ductility during contraction is low enough.

Kuhle, Nathan John

2001-01-01T23:59:59.000Z

479

Chemical composition of water and gas from five nearshore subaqueous springs in Clear Lake, northern California  

SciTech Connect

In 1971 The Geysers-Clear Lake area was selected by the US Geological Survey geothermal research program as a region for extensive investigation. Under this program thermal water samples were first collected in December, 1974 during a winter of normal rainfall; the last samples were collected in February, 1977 during a period of drought. The drought exposed many springs which normally are submerged by Clear Lake. It was demonstrated that gas and water samples can be collected from shallow submerged springs relatively simply using a peristaltic, battery powered pump. Qualitatively sulfate, ammonia, chloride and lithium concentrations may be used to estimate the amount of lake water contamination. The gas sampling technique, using an inverted funnel and long tube to the surface only where visibility was greater than 2 to 3 m. Analyses of near surface compared to deeper submerged gas indicates air contamination in the near surface sample. Thus gas samples should be collected deep underwater or as near the spring vent or gas orifice as possible.

Thompson, J.M.; Sims, J.D.; Yadav, S.; Rymer, M.J.

1979-01-01T23:59:59.000Z

480

Tracking Down the ENSO Delayed Oscillator with an Adjoint OGCM  

Science Conference Proceedings (OSTI)

According to the delayed-oscillator picture of ENSO, a positive SST anomaly in the eastern tropical Pacific will cause westerly wind anomalies closer to the date line to first give a positive feedback, and later, via planetary wave reflection at ...

Geert Jan van Oldenborgh; Gerrit Burgers; Stephan Venzke; Christian Eckert; Ralf Giering

1999-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "delayed fault clearing" from the National Library of EnergyBeta (NLEBeta).
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481

GPS Meteorology: Mapping Zenith Wet Delays onto Precipitable Water  

Science Conference Proceedings (OSTI)

Emerging networks of Global Positioning System (GPS) receivers can be used in the remote sensing of atmospheric water vapor. The time-varying zenith wet delay observed at each GPS receiver in a network can be transformed into an estimate of the ...

Michael Bevis; Steven Businger; Steven Chiswell; Thomas A. Herring; Richard A. Anthes; Christian Rocken; Randolph H. Ware

1994-03-01T23:59:59.000Z

482

Why Can Wind Delay the Shedding of Loop Current Eddies?  

Science Conference Proceedings (OSTI)

It is first shown that wind in the Gulf of Mexico can delay the shedding of Loop Current eddies. A time-dependent, three-dimensional numerical experiment forced by a spatially and temporally constant westward wind stress within the Gulf is ...

Y.-L. Chang; L.-Y. Oey

2010-11-01T23:59:59.000Z

483

Transportation Center Seminar "Flight Delays, Capacity Investment and Welfare under  

E-Print Network (OSTI)

Transportation Center Seminar "Flight Delays, Capacity Investment and Welfare under Air Transport University of Illinois at Chicago (UIC) Thurs. April 4, 2013 4:00 ­ 5:00 pm Location: Transportation Center in the air transportation system. The Federal Aviation Administration (FAA) and local airport agencies have

Bustamante, Fabián E.

484

Delay of intrusion detection in wireless sensor networks  

Science Conference Proceedings (OSTI)

In this paper we consider sensor networks for intrusion detection, such that node deployment, node failures and node behavior result in coverage gaps and a fraction of disconnected nodes in an otherwise dense and well-connected network. We focus on the ... Keywords: delay, intrusion detection, percolation, sensor networks

Olivier Dousse; Christina Tavoularis; Patrick Thiran

2006-05-01T23:59:59.000Z

485

Delayed neutron emission measurements for U-235 and Pu-239  

E-Print Network (OSTI)

The delayed neutron emission rates of U-235 and Pu-239 samples were measured accurately from a thermal fission reaction. A Monte Carlo calculation using the Geant4 code was used to demonstrate the neutron energy independence of the detector used in the counting station. A set of highly purified actinide samples (U-235 and Pu-239) was irradiated in these experiments by using the Texas A&M University Nuclear Science Center Reactor. A fast pneumatic transfer system, an integrated computer control system, and a graphite-moderated counting system were constructed to perform all these experiments. The calculated values for the five-group U-235 delayed neutron parameters and the six-group Pu-239 delayed neutron parameters were compared with the values recommended by Keepin et al. (1957) and Waldo et al. (1981). These new values differ slightly from literature values. The graphite-moderated counting station and the computerized pneumatic system are now operational for further delayed neutron measurement.

Chen, Yong

2006-12-01T23:59:59.000Z