Sample records for andreas fault system

  1. andreas fault system: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    system Sontag, Eduardo 23 The San Andreas Fault In The San Francisco Bay Area, California: A Geology Fieldtrip Guidebook To Selected Stops On Public Lands CiteSeer Summary:...

  2. Coulomb stress accumulation along the San Andreas Fault system Bridget Smith and David Sandwell

    E-Print Network [OSTI]

    Smith-Konter, Bridget

    Coulomb stress accumulation along the San Andreas Fault system Bridget Smith and David Sandwell deformation, SCEC velocities, crustal stress Citation: Smith, B., and D. Sandwell, Coulomb stress accumulation

  3. The San Andreas Fault System Paul Withers Wallace RE, The San Andreas Fault System, California, USGS Professional Paper 1515,

    E-Print Network [OSTI]

    Withers, Paul

    mainland Mexico. The San Andreas fault is commonly referred to as the boundary between the Pacific is correlated with the local geological setting. CO2 lubrication, #12;increased pore pressure, and decreased

  4. Microfracture fabric of the Punchbowl fault zone, San Andreas System, California

    E-Print Network [OSTI]

    Wilson, Jennifer Elizabeth

    1999-01-01T23:59:59.000Z

    The origin of fault zone structure is not completely understood. On the basis of mechanistic models of faulting, the characteristic internal structure of faults may largely be established early during growth of the fault, or it may develop...

  5. Towards a Framework for IT Service Fault Management Andreas Hanemann*, Martin Sailer

    E-Print Network [OSTI]

    with the service quality in this sense differ from problems in the area of network and systems management. To improve the overall service quality the management of IT service quality degradations is a critical issueTowards a Framework for IT Service Fault Management Andreas Hanemann*, Martin Sailer , and David

  6. Shallow soil CO2 flow along the San Andreas and Calaveras Faults, California

    E-Print Network [OSTI]

    Hilley, George

    Shallow soil CO2 flow along the San Andreas and Calaveras Faults, California J. L. Lewicki,1,2 W. C soil CO2 survey along the San Andreas fault (SAF) in Parkfield, and the Calaveras fault (CF) in Hollister, California, in the context of spatial and temporal variability, origin, and transport of CO2

  7. Mesoscale fracture fabric and paleostress along the San Andreas fault at SAFOD

    E-Print Network [OSTI]

    Almeida, Rafael Vladimir

    2009-05-15T23:59:59.000Z

    Spot cores from Phase 1 drilling of the main borehole at the San Andreas Fault Observatory at Depth (SAFOD) were mapped to characterize the mesoscale structure and infer paleostress at depth. Cores were oriented by comparing mapped structures...

  8. andreas fault zone: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Andreas Fichtner a,(n) Geosciences Websites Summary: Technical University, Istanbul, Turkey d Nancy School of Geology, Computer Science Department, Nancy, France which shapes the...

  9. Damage and seismic velocity structure of pulverized rocks near the San Andreas Fault

    E-Print Network [OSTI]

    Ben-Zion, Yehuda

    Damage and seismic velocity structure of pulverized rocks near the San Andreas Fault Marieke Rempe south of Littlerock, California. The examined site has a strongly asymmetric damage structure with respect to the SAF core. The conglomerates to the southwest show little to no damage, whereas a ~100 m

  10. submitted to Geophys. J. Int. Aquifer and Shallow San Andreas Fault

    E-Print Network [OSTI]

    Saar, Martin O.

    levels as constraints, we model pore-fluid pressure diffusion and groundwater flow across these two ­ Coachella Valley ­ San Andreas Fault ­ Land subsidence ­ Groundwater overdraft. 1 INTRODUCTION Formation Poroelastic Modeling of InSAR-Determined Land Surface Deformation in Coachella Valley, California Ravi Appana1

  11. Solar system fault detection

    DOE Patents [OSTI]

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

    1984-05-14T23:59:59.000Z

    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.

  12. Response of creepmeters on the San Andreas fault near Parkfield to the earthquake

    SciTech Connect (OSTI)

    Schulz, S.S.; Mavko, G.M.; Brown, B.D.

    1990-01-01T23:59:59.000Z

    A total of 14 US Geological Survey creepmeters on the San Andreas fault in central California recorded coseismic steps coincident with the M = 6.7 May 2 earthquake. Creepmeters near Parkfield recorded the largest effects. Postearthquake creep rates slowed significantly, and creep at one station reversed to left lateral. About 4 months after the earthquake, decreased rates caused cumulative creep at four Parkfield stations to fall below long-term linear trends observed before May 2. At several stations, creep continued to be either left lateral or slower than normal for the rest of 1983. By January 31, 1984, all but two stations recorded resumption of right-lateral creep at reduced rates. As late as April 1, 1984, however, one station north of Parkfield continued to record left-lateral drift, and another station at the south end of the creeping section south of Parkfield recorded little or no movement. One interpretation of the creep slowdown after May 2 is that the Coalinga main shock released accumulated stress in the upper kilometer or so of the San Andreas fault near Parkfield, and several months elapsed before stress built up sufficiently to allow creep to resume. A multiple-linear-regression analysis of coseismic-step size as a function of distance from the creepmeter to an earthquake focus and (or) earthquake magnitude showed a linear correlation between step size and magnitude for the data from two stations. No correlation was found between step size and distance to focus for the data from any of the stations. Reduction in step sizes after May 2, despite numerous large aftershocks, suggests that stored local stress is the dominant factor in coseismic-step size.

  13. The Fabric of Clasts, Veins and Foliations within the Actively Creeping Zones of the San Andreas Fault at SAFOD: Implications for Deformation Processes

    E-Print Network [OSTI]

    Sills, David Wayne

    2012-02-14T23:59:59.000Z

    of Committee, Judith Chester Committee Members, Frederick Chester David Schechter Head of Department, Andreas Kronenberg December 2010 Major Subject: Geology iii ABSTRACT The Fabric of Clasts, Veins and Foliations within the Actively... Creeping Zones of the San Andreas Fault at SAFOD: Implications for Deformation Processes. (December 2010) David Wayne Sills, B.S., Sam Houston State University; M.S., Texas A&M University Chair of Advisory Committee: Dr. Judith Chester Recovered...

  14. A High shear stress segment along the San Andreas Fault: Inferences based on near-field stress direction and stress magnitude observations in the Carrizo Plain Area

    SciTech Connect (OSTI)

    Castillo, D. A., [Department of Geology and Geophysics, University of Adelaide (Australia); Younker, L.W. [Lawrence Livermore National Lab., CA (United States)

    1997-01-30T23:59:59.000Z

    Nearly 200 new in-situ determinations of stress directions and stress magnitudes near the Carrizo plain segment of the San Andreas fault indicate a marked change in stress state occurring within 20 km of this principal transform plate boundary. A natural consequence of this stress transition is that if the observed near-field ``fault-oblique`` stress directions are representative of the fault stress state, the Mohr-Coulomb shear stresses resolved on San Andreas sub-parallel planes are substantially greater than previously inferred based on fault-normal compression. Although the directional stress data and near-hydrostatic pore pressures, which exist within 15 km of the fault, support a high shear stress environment near the fault, appealing to elevated pore pressures in the fault zone (Byerlee-Rice Model) merely enhances the likelihood of shear failure. These near-field stress observations raise important questions regarding what previous stress observations have actually been measuring. The ``fault-normal`` stress direction measured out to 70 km from the fault can be interpreted as representing a comparable depth average shear strength of the principal plate boundary. Stress measurements closer to the fault reflect a shallower depth-average representation of the fault zone shear strength. If this is true, only stress observations at fault distances comparable to the seismogenic depth will be representative of the fault zone shear strength. This is consistent with results from dislocation monitoring where there is pronounced shear stress accumulation out to 20 km of the fault as a result of aseismic slip within the lower crust loading the upper locked section. Beyond about 20 km, the shear stress resolved on San Andreas fault-parallel planes becomes negligible. 65 refs., 15 figs.

  15. Arc fault detection system

    DOE Patents [OSTI]

    Jha, Kamal N. (Bethel Park, PA)

    1999-01-01T23:59:59.000Z

    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.

  16. Arc fault detection system

    DOE Patents [OSTI]

    Jha, K.N.

    1999-05-18T23:59:59.000Z

    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.

  17. Characterization of Damage in Sandstones along the Mojave Section of the San Andreas Fault: Implications for the Shallow Extent of Damage

    E-Print Network [OSTI]

    Ben-Zion, Yehuda

    Characterization of Damage in Sandstones along the Mojave Section of the San Andreas Fault: Implications for the Shallow Extent of Damage Generation ORY DOR,1,5 JUDITH S. CHESTER,2 YEHUDA BEN-ZION,1 shallow generation of rock damage during an earthquake rupture, we measure the degree of fracture damage

  18. Fault Tolerant Quantum Filtering and Fault Detection for Quantum Systems

    E-Print Network [OSTI]

    Qing Gao; Daoyi Dong; Ian R. Petersen

    2015-04-26T23:59:59.000Z

    This paper aims to determine the fault tolerant quantum filter and fault detection equation for a class of open quantum systems coupled to laser fields and subject to stochastic faults. In order to analyze open quantum systems where the system dynamics involve both classical and quantum random variables, a quantum-classical probability space model is developed. Using a reference probability approach, a fault tolerant quantum filter and a fault detection equation are simultaneously derived for this class of open quantum systems. An example of two-level open quantum systems subject to Poisson-type faults is presented to illustrate the proposed method. These results have the potential to lead to a new fault tolerant control theory for quantum systems.

  19. Row fault detection system

    DOE Patents [OSTI]

    Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)

    2010-02-23T23:59:59.000Z

    An apparatus and program product check for nodal faults in a row of nodes by causing each node in the row to concurrently communicate with its adjacent neighbor nodes in the row. The communications are analyzed to determine a presence of a faulty node or connection.

  20. Row fault detection system

    DOE Patents [OSTI]

    Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)

    2012-02-07T23:59:59.000Z

    An apparatus, program product and method check for nodal faults in a row of nodes by causing each node in the row to concurrently communicate with its adjacent neighbor nodes in the row. The communications are analyzed to determine a presence of a faulty node or connection.

  1. Sensor Fault Detection and Isolation System

    E-Print Network [OSTI]

    Yang, Cheng-Ken

    2014-08-01T23:59:59.000Z

    The purpose of this research is to develop a Fault Detection and Isolation (FDI) system which is capable to diagnosis multiple sensor faults in nonlinear cases. In order to lead this study closer to real world applications in oil industries...

  2. Vertical crustal displacement due to interseismic deformation along the San Andreas fault

    E-Print Network [OSTI]

    Sandwell, David T.

    -strike variations in fault orientation and locking depth. Tide gauge stations provide a long (50100 year) recording: Constraints from tide gauges Bridget R. Smith-Konter1,2 , Garrett M. Thornton2 , and David T. Sandwell3 1 good agreement with the relative tide gauge uplift rates. These results suggest that sea level

  3. Condition Assessment and Fault Prognostics of Microelectromechanical Systems

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    monitoring, Condition assessment, Fault detection, Fault diagnostics, Fault prognostics. Corresponding, batteries, etc.) to complete machines (wind turbines, electrical motors, machining tools, etc.). SeveralCondition Assessment and Fault Prognostics of Microelectromechanical Systems K. Medjaher , H. Skima

  4. Modeling and Measurement Constraints in Fault Diagnostics for HVAC Systems

    E-Print Network [OSTI]

    Najafi, Massieh

    2010-01-01T23:59:59.000Z

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

  5. The Starr fault system of southeastern Ohio

    SciTech Connect (OSTI)

    Brannock, M.C. (Qauker State Corp., Belpre, OH (United States))

    1993-08-01T23:59:59.000Z

    The Starr fault system is a series of east-west-trending faults located in southeastern Ohio. This fault system was discovered by mapping the anomalous sedimentary sequence of the [open quotes]Big Lime[close quotes]. The Big Lime is a driller's term for the stratigraphic section that includes the Lower Devonian Onondaga through Middle Silurian Lockport formations. The use of trend-surface analysis identified the probable fault orientation, which was then verified by seismic. The system is a series of high-angle faults, originating in the Precambrian, that occur along a narrow corridor traversing several townships. Analysis of the sedimentary section preserved by faulting indicates fault movement after the deposition of the Bass Island Formation, which was followed by a regional unconformity that removed the Bass Islands and a part of the upper Salina Formation. The Onondaga subsequently was deposited, masking fault movement evidence in the shallower formations. Some minor movement occurred later, as evidenced by the expansion in the Devonian shale sequence. The geometry of the fault system and other data suggest a pattern similar to the Albio-Scipio field of southern Michigan. A group of wells were drilled to test the Ordovician Trenton and Black River formations to determine the existence of secondary dolomite, which could be a potential reservoir. Secondary dolomite was encountered, but no commercial hydrocarbons were found in either the Trenton or Black River. Other formations produced hydrocarbons and water from fractured zones that were not known for this behavior. Other probable fault systems in southern Ohio, identified by using the same mapping techniques, may provide deeper targets for future drilling.

  6. Cell boundary fault detection system

    DOE Patents [OSTI]

    Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)

    2011-04-19T23:59:59.000Z

    An apparatus and program product determine a nodal fault along the boundary, or face, of a computing cell. Nodes on adjacent cell boundaries communicate with each other, and the communications are analyzed to determine if a node or connection is faulty.

  7. Fault prophet : a fault injection tool for large scale computer systems

    E-Print Network [OSTI]

    Tchwella, Tal

    2014-01-01T23:59:59.000Z

    In this thesis, I designed and implemented a fault injection tool, to study the impact of soft errors for large scale systems. Fault injection is used as a mechanism to simulate soft errors, measure the output variability ...

  8. Observations and modeling of shallow fault creep along the San Andreas Fault System

    E-Print Network [OSTI]

    Wei, Meng

    2011-01-01T23:59:59.000Z

    third goal is to test the two-layer creep model for aseismican additional test, we removed data where the creep rate wastest the hypothesis that the depth of the long-term shallow steady creep

  9. Fault interaction near Hollister, California

    SciTech Connect (OSTI)

    Mavko, G.M.

    1982-09-10T23:59:59.000Z

    A numerical model is used to study fault stress slip near Hollister, California. The geometrically complex system of interacting faults, including the San Andreas, Calaveras, Sargent, and Busch faults, is approximated with a two-dimensional distribution of short planar fault segments in an elastic medium. The steady stress and slip rate are simulated by specifying frictional strength and stepping the remote stress ahead in time. The resulting computed fault stress is roughly proportional to the observed spatial density of small earthquakes, suggesting that the distinction between segments characterized by earthquakes and those with aseismic creep results, in part, from geometry. A nonsteady simulation is made by introducing, in addition, stress drops for individual moderate earthquakes. A close fit of observed creep with calculated slip on the Calaveras and San Andreas faults suggests that many changes in creep rate (averaged over several months) are caused by local moderate earthquakes. In particular, a 3-year creep lag preceding the August 6, 1979, Coyote Lake earthquake on the Calaveras fault seems to have been a direct result of the November 28, 1974, Thanksgiving Day earthquake on the Busch fault. Computed lags in slip rate preceding some other moderate earthquakes in the area are also due to earlier earthquakes. Although the response of the upper 1 km of the fault zone may cause some individual creep events and introduce delays in others, the long-term rate appears to reflect deep slip.

  10. Improving Distribution System Reliability Through Risk-base Doptimization of Fault Management and Improved Computer-based Fault Location

    E-Print Network [OSTI]

    Dong, Yimai

    2013-11-07T23:59:59.000Z

    )s regulation on power quality. Optimization in fault management tasks has the potential of improving system reliability by reducing the duration and scale of outages caused by faults through fast fault isolation and service restoration. The research reported...

  11. Development of secondary faults between en echelon, oblique-slip faults: examples from basement controlled, small-fault systems in the Llano Uplift of central Texas

    E-Print Network [OSTI]

    Hedgcoxe, Howard Reiffert

    1987-01-01T23:59:59.000Z

    correspond to the NE trending set of faults and the secondary antithetic faults corre- spond to the N to NNE set (Figure 12). Fractures, represented by the dashed lines in Figure 12, occur in direct association with the primary and secondary faults...DEVELOPMENT OF SECONDARY FAULTS BETWEEN EN ECHELON, OBLIQUE-SLIP FAULTS: EXAMPLES FROM BASEMENT CONTROLLED, SMALL-FAULT SYSTEMS IN THE LLANO UPLIFT OF CENTRAL TEXAS A Thesis by HOWARD REIFFERT HEDGCOXE Submitted to the Graduate College...

  12. Physiochemical Evidence of Faulting Processes and Modeling of Fluid in Evolving Fault Systems in Southern California

    SciTech Connect (OSTI)

    Boles, James [Professor

    2013-05-24T23:59:59.000Z

    Our study targets recent (Plio-Pleistocene) faults and young (Tertiary) petroleum fields in southern California. Faults include the Refugio Fault in the Transverse Ranges, the Ellwood Fault in the Santa Barbara Channel, and most recently the Newport- Inglewood in the Los Angeles Basin. Subsurface core and tubing scale samples, outcrop samples, well logs, reservoir properties, pore pressures, fluid compositions, and published structural-seismic sections have been used to characterize the tectonic/diagenetic history of the faults. As part of the effort to understand the diagenetic processes within these fault zones, we have studied analogous processes of rapid carbonate precipitation (scaling) in petroleum reservoir tubing and manmade tunnels. From this, we have identified geochemical signatures in carbonate that characterize rapid CO2 degassing. These data provide constraints for finite element models that predict fluid pressures, multiphase flow patterns, rates and patterns of deformation, subsurface temperatures and heat flow, and geochemistry associated with large fault systems.

  13. Experimental characterization of faults on low-voltage systems

    E-Print Network [OSTI]

    Ahmed, Jubayer

    1992-01-01T23:59:59.000Z

    was to simulate a con- trolled arcing fault. Hence, the arcgap was maintained constant for a particular test. A tungsten welding rod was used as the electrode because it does not melt easily. This test was performed on a. single-phase system with 240 volts... better understanding of the problem. These arcing faults and high impedance and incipient faults constitute the previously mentioned low-current faults. Journal model is IEEE Transactions on Power Delivery. Although these problems have been...

  14. Automated Fault Location In Smart Distribution Systems

    E-Print Network [OSTI]

    Lotfifard, Saeed

    2012-10-19T23:59:59.000Z

    ............................................................................................................................ 88 x LIST OF FIGURES Page Figure 1 Multiple possible fault location estimation for a fault at node A ........................ 7 Figure 2 Simple faulted network model [1] [2011] IEEE ............................................ 40 Figure 3... Types C and D voltage sags for different phases [51] [2003] IEEE .............. 42 Figure 4 Rf estimation procedure [1] [2011] IEEE ...................................................... 45 Figure 5 Flow chart of the fault location algorithm [1...

  15. A Hybrid Model Based and Statistical Fault Diagnosis System for Industrial Process

    E-Print Network [OSTI]

    Lin, Chen-Han

    2014-11-21T23:59:59.000Z

    This thesis presents a hybrid model based and statistical fault diagnosis system, which applied on the nonlinear three-tank model. The purpose of fault diagnosis is generating and analyzing the residual to find out the fault occurrence. This fault...

  16. Fault Tolerant Oxygen Control of a Diesel Engine Air System

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    Fault Tolerant Oxygen Control of a Diesel Engine Air System Rainer Nitsche Matthias Bitzer control problem of a Diesel engine air system having a jammed Exhaust Gas Recirculation (EGR) valve of the air system. Keywords: Fault tolerant control, Diesel engine, Air system, Model-based trajectory

  17. Identifying Efficiency Degrading Faults in Split Air Conditioning Systems

    E-Print Network [OSTI]

    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

    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...

  18. Automated Fault Location In Smart Distribution Systems

    E-Print Network [OSTI]

    Lotfifard, Saeed

    2012-10-19T23:59:59.000Z

    Quality Meters (PQM), are installed to capture harmonics and certain disturbances for analyzing the power quality indices. Digital Protective Relays are utilized to detect occurrence of the faults and isolate faulted section as fast as possible. Digital... Protective Relays) use synchronous methods [28]. Therefore, if the available data is provided by RTUs, fault location methods that operate based on direct comparison of the input samples cannot be 17 utilized. However, if the data could be gathered from...

  19. All-to-all sequenced fault detection system

    DOE Patents [OSTI]

    Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)

    2010-11-02T23:59:59.000Z

    An apparatus, program product and method enable nodal fault detection by sequencing communications between all system nodes. A master node may coordinate communications between two slave nodes before sequencing to and initiating communications between a new pair of slave nodes. The communications may be analyzed to determine the nodal fault.

  20. Online Fault Detection and Tolerance for Photovoltaic Energy Harvesting Systems

    E-Print Network [OSTI]

    Pedram, Massoud

    and weather conditions (e.g., clouds), and the output power of PV systems is directly dependent on solar and mitigate the output power shortage under low levels of solar irradiance. Moreover, PV panels exhibit highly fault detection and tolerance. Our fault detection and tolerance technique reduces output power

  1. Detecting and tolerating Byzantine faults in database systems

    E-Print Network [OSTI]

    Vandiver, Benjamin Mead, 1978-

    2008-01-01T23:59:59.000Z

    This thesis describes the design, implementation, and evaluation of a replication scheme to handle Byzantine faults in transaction processing database systems. The scheme compares answers from queries and updates on multiple ...

  2. Detecting and Tolerating Byzantine Faults in Database Systems

    E-Print Network [OSTI]

    Vandiver, Benjamin Mead

    2008-06-30T23:59:59.000Z

    This thesis describes the design, implementation, and evaluation of a replication scheme to handle Byzantine faults in transaction processing database systems. The scheme compares answers from queries and updates on multiple ...

  3. Analysis of transmission system faults in the phase domain

    E-Print Network [OSTI]

    Zhu, Jun

    2004-11-15T23:59:59.000Z

    In order to maintain a continuous power suppply, nowadays relays in transmission systems are required to be able to deal with complicated faults involving non-conventional connections, which poses a challenge to the short circuit analysis...

  4. All row, planar fault detection system

    DOE Patents [OSTI]

    Archer, Charles Jens; Pinnow, Kurt Walter; Ratterman, Joseph D; Smith, Brian Edward

    2013-07-23T23:59:59.000Z

    An apparatus, program product and method for detecting nodal faults may simultaneously cause designated nodes of a cell to communicate with all nodes adjacent to each of the designated nodes. Furthermore, all nodes along the axes of the designated nodes are made to communicate with their adjacent nodes, and the communications are analyzed to determine if a node or connection is faulty.

  5. Multi-directional fault detection system

    DOE Patents [OSTI]

    Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)

    2010-11-23T23:59:59.000Z

    An apparatus, program product and method checks for nodal faults in a group of nodes comprising a center node and all adjacent nodes. The center node concurrently communicates with the immediately adjacent nodes in three dimensions. The communications are analyzed to determine a presence of a faulty node or connection.

  6. Multi-directional fault detection system

    DOE Patents [OSTI]

    Archer, Charles Jens; Pinnow, Kurt Walter; Ratterman, Joseph D.; Smith, Brian Edward

    2010-06-29T23:59:59.000Z

    An apparatus, program product and method checks for nodal faults in a group of nodes comprising a center node and all adjacent nodes. The center node concurrently communicates with the immediately adjacent nodes in three dimensions. The communications are analyzed to determine a presence of a faulty node or connection.

  7. Helium and Carbon Isotope Systematics in Groundwaters along the Southern San Andreas Fault System /

    E-Print Network [OSTI]

    Evans, Tyler John

    2013-01-01T23:59:59.000Z

    P. , & Newton, R. (2010). Low helium flux from the mantlefrom simulations of oceanic helium isotope data. Earth andJ. , & Baur, H. (1995). Helium, neon, and argon systematics

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

    E-Print Network [OSTI]

    Fialko, Y

    2006-01-01T23:59:59.000Z

    driving the interseismic deformation at the brittle-ductile transition are denoted by dashed green lines

  9. Andreas Sterl, SEAMOCS, Malta, 17.03.2009 Hot temperatures and storm surges

    E-Print Network [OSTI]

    Haak, Hein

    Andreas Sterl, SEAMOCS, Malta, 17.03.2009 Hot temperatures and storm surges: Modelling the change #12;Andreas Sterl, SEAMOCS, Malta, 17.03.2009 Climate what's that? Climate = statistics of weather" #12;Andreas Sterl, SEAMOCS, Malta, 17.03.2009 The climate system AR4, FAQ 1.2, Fig. 1 #12;Andreas

  10. Wind Energy Conversion Systems Fault Diagnosis Using Wavelet Analysis

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    Wind Energy Conversion Systems Fault Diagnosis Using Wavelet Analysis Elie Al-Ahmar1,2 , Mohamed El, induction generator, Discrete Wavelet Transform (DWT), failure diagnosis. I. Introduction Wind energy the condition of induction machines. Fig. 1. Worldwide growth of wind energy installed capacity [1]. 1 E. Al

  11. Combining Tools for the Verification of FaultTolerant Systems

    E-Print Network [OSTI]

    Peleska, Jan - Fachbereich 3

    and verification of faulttolerant systems according to the invent&verify paradigm. Our method is based on the CSP specifications (CSP process terms), refinement relations or combinations of these three description formalisms specification paradigms ac cording to the specific needs of each development step is essential to cope

  12. ADECENTRALIZED APPROACH TOWARDS AUTONOMOUS FAULT DETECTION IN WIRELESS STRUCTURAL HEALTH MONITORING SYSTEMS

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    ADECENTRALIZED APPROACH TOWARDS AUTONOMOUS FAULT DETECTION IN WIRELESS STRUCTURAL HEALTH MONITORING structural health monitoring (SHM) systems may reduce the monitoring quality and, if remaining undetected : Autonomous fault detection, structural health monitoring, wireless sensor networks, smart sensors, analytical

  13. Low-cost motor drive embedded fault diagnosis systems

    E-Print Network [OSTI]

    Akin, Bilal

    2009-05-15T23:59:59.000Z

    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...

  14. State of the art analysis of online fault location on AC cables in underground transmission systems

    E-Print Network [OSTI]

    Bak, Claus Leth

    on transmission level fault location methods have been focused on overhead lines. Because of the very different- termine the fault location. Because only one end meas- urements are used, the algorithm is derived usingState of the art analysis of online fault location on AC cables in underground transmission systems

  15. CSE 513: Distributed Systems (Fault-tolerance)

    E-Print Network [OSTI]

    Cao, Guohong

    fails to operate correctly, nothing catastrophic happens; e.g., in nuclear power plans at all servers in the same order. 8 The Two-Army Problem · Without failure, agreement is trivial, but agreement in faulty systems is much harder. ­ Agreement is needed in electing a coordinator, deciding

  16. Fault-tolerant reactor protection system

    DOE Patents [OSTI]

    Gaubatz, D.C.

    1997-04-15T23:59:59.000Z

    A reactor protection system is disclosed having four divisions, with quad redundant sensors for each scram parameter providing input to four independent microprocessor-based electronic chassis. Each electronic chassis acquires the scram parameter data from its own sensor, digitizes the information, and then transmits the sensor reading to the other three electronic chassis via optical fibers. To increase system availability and reduce false scrams, the reactor protection system employs two levels of voting on a need for reactor scram. The electronic chassis perform software divisional data processing, vote 2/3 with spare based upon information from all four sensors, and send the divisional scram signals to the hardware logic panel, which performs a 2/4 division vote on whether or not to initiate a reactor scram. Each chassis makes a divisional scram decision based on data from all sensors. Each division performs independently of the others (asynchronous operation). All communications between the divisions are asynchronous. Each chassis substitutes its own spare sensor reading in the 2/3 vote if a sensor reading from one of the other chassis is faulty or missing. Therefore the presence of at least two valid sensor readings in excess of a set point is required before terminating the output to the hardware logic of a scram inhibition signal even when one of the four sensors is faulty or when one of the divisions is out of service. 16 figs.

  17. Fault-tolerant reactor protection system

    DOE Patents [OSTI]

    Gaubatz, Donald C. (Cupertino, CA)

    1997-01-01T23:59:59.000Z

    A reactor protection system having four divisions, with quad redundant sensors for each scram parameter providing input to four independent microprocessor-based electronic chassis. Each electronic chassis acquires the scram parameter data from its own sensor, digitizes the information, and then transmits the sensor reading to the other three electronic chassis via optical fibers. To increase system availability and reduce false scrams, the reactor protection system employs two levels of voting on a need for reactor scram. The electronic chassis perform software divisional data processing, vote 2/3 with spare based upon information from all four sensors, and send the divisional scram signals to the hardware logic panel, which performs a 2/4 division vote on whether or not to initiate a reactor scram. Each chassis makes a divisional scram decision based on data from all sensors. Each division performs independently of the others (asynchronous operation). All communications between the divisions are asynchronous. Each chassis substitutes its own spare sensor reading in the 2/3 vote if a sensor reading from one of the other chassis is faulty or missing. Therefore the presence of at least two valid sensor readings in excess of a set point is required before terminating the output to the hardware logic of a scram inhibition signal even when one of the four sensors is faulty or when one of the divisions is out of service.

  18. An expert system for fault detection and diagnosis

    E-Print Network [OSTI]

    Spasojevic, Predrag

    1992-01-01T23:59:59.000Z

    to thank Dr. Ali Abur for his help in setting Eb1TP simulations. I would also lilre to thank Charles Fromen and Don Sevcik both with HLtrP Houston for providing invaluable expertise used in this thesis. TABLE OF CONTENTS CHAPTER Page INTRODUCTION . A... IV EXPERT SYSTEM DESIGN . . A. Introduction B. Rochester DFR Conversion C. EMTP Output File Conversion 46 46 47 54 vn1 CHAPTER Page VI D. Signal Analysis: MATI, AB . E. Fault Diagnosis: CLIPS F. Waveform Presentation: MATLAB G...

  19. Methodology for designing the fuzzy resolver for a radial distribution system fault locator

    E-Print Network [OSTI]

    Li, Jun

    2006-04-12T23:59:59.000Z

    The Power System Automation Lab at Texas A&M University developed a fault location scheme that can be used for radial distribution systems. When a fault occurs, the scheme executes three stages. In the first stage, all data measurements and system...

  20. Action Models: A Reliability Modeling Formalism for Fault-Tolerant Distributed Computing Systems

    E-Print Network [OSTI]

    Newcastle upon Tyne, University of

    Action Models: A Reliability Modeling Formalism for Fault-Tolerant Distributed Computing Systems. Introduction Model-based evaluation of the reliability of distributed systems has traditionally required expert- proach to analyze the reliability of fault-tolerant distributed systems. More in particular, we want

  1. Seismoelectric Imaging of a Shallow Fault System Employing Fault Guided Waves

    E-Print Network [OSTI]

    Cohrs, Frelynn Joseph Reese

    2012-07-16T23:59:59.000Z

    Independent sets of reflection seismic and seismoelectric data were collected, processed, and interpreted with the aim of generating and studying guided waves within a fault zone. While seismic surveys have recently been utilized to investigate...

  2. Generalized Standby-Sparing Techniques for Energy-Efficient Fault Tolerance in Multiprocessor Real-Time Systems

    E-Print Network [OSTI]

    Aydin, Hakan

    Generalized Standby-Sparing Techniques for Energy-Efficient Fault Tolerance in Multiprocessor Real-Sparing (SS) technique has been pre- viously explored to improve energy efficiency while providing fault faults, we develop energy-efficient fault tolerance techniques for real-time systems deploying

  3. Detecting Intrusion Faults in Remotely Controlled Systems Salvatore Candido and Seth Hutchinson

    E-Print Network [OSTI]

    Hutchinson, Seth

    the design process. With this in mind, researchers have begun to address security issues specific to controlDetecting Intrusion Faults in Remotely Controlled Systems Salvatore Candido and Seth Hutchinson to a remote-controlled system (deemed an "intrusion fault" or "intrusion") despite attempts to conceal

  4. REPLICATION AND FAULT-TOLERANCE IN THE ISIS SYSTEM t Kenneth P. Birman

    E-Print Network [OSTI]

    Newhall, Tia

    REPLICATION AND FAULT-TOLERANCE IN THE ISIS SYSTEM t Kenneth P. Birman Department of Computer Science Cornell University, Ithaca, New York ABSTRACT The ISIS system transforms abstract type. The performance of distributed fault-tolerant services runnin8 on this initial version of ISIS is found

  5. Award ER25750: Coordinated Infrastructure for Fault Tolerance Systems Indiana University Final Report

    SciTech Connect (OSTI)

    Lumsdaine, Andrew

    2013-03-08T23:59:59.000Z

    The main purpose of the Coordinated Infrastructure for Fault Tolerance in Systems initiative has been to conduct research with a goal of providing end-to-end fault tolerance on a systemwide basis for applications and other system software. While fault tolerance has been an integral part of most high-performance computing (HPC) system software developed over the past decade, it has been treated mostly as a collection of isolated stovepipes. Visibility and response to faults has typically been limited to the particular hardware and software subsystems in which they are initially observed. Little fault information is shared across subsystems, allowing little flexibility or control on a system-wide basis, making it practically impossible to provide cohesive end-to-end fault tolerance in support of scientific applications. As an example, consider faults such as communication link failures that can be seen by a network library but are not directly visible to the job scheduler, or consider faults related to node failures that can be detected by system monitoring software but are not inherently visible to the resource manager. If information about such faults could be shared by the network libraries or monitoring software, then other system software, such as a resource manager or job scheduler, could ensure that failed nodes or failed network links were excluded from further job allocations and that further diagnosis could be performed. As a founding member and one of the lead developers of the Open MPI project, our efforts over the course of this project have been focused on making Open MPI more robust to failures by supporting various fault tolerance techniques, and using fault information exchange and coordination between MPI and the HPC system software stack?from the application, numeric libraries, and programming language runtime to other common system components such as jobs schedulers, resource managers, and monitoring tools.

  6. Detection and diagnosis of faults and energy monitoring of HVAC systems with least-intrusive power analysis

    E-Print Network [OSTI]

    Luo, Dong, 1966-

    2001-01-01T23:59:59.000Z

    Faults indicate degradation or sudden failure of equipment in a system. Widely existing in heating, ventilating, and air conditioning (HVAC) systems, faults always lead to inefficient energy consumption, undesirable indoor ...

  7. Mean-risk optimization of electricity portfolios Andreas Eichhorn 1

    E-Print Network [OSTI]

    Eichhorn, Andreas

    refer to a wide range of literature dealing with power management in a hydro-thermal system and simultaneous optimization of power production and electricity trading, e.g. [7] and [10]. We suppose that eachMean-risk optimization of electricity portfolios Andreas Eichhorn 1 , Nicole Growe-Kuska1 , Andrea

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

    Open Energy Info (EERE)

    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...

  9. Decentralized Fault Detection and Isolation in Wireless Structural Health Monitoring Systems using Analytical Redundancy

    E-Print Network [OSTI]

    Stanford University

    1/43 Decentralized Fault Detection and Isolation in Wireless Structural Health Monitoring Systems when deploying wireless sensor networks for long-term structural health monitoring (SHM) is the correct Fault detection and isolation, structural health monitoring, wireless sensing, smart structures

  10. Hydrogeological aspects of fault zones on various scales in the Roer Valley Rift System

    E-Print Network [OSTI]

    Bense, Victor

    within fault zones has important implications for the modeling of groundwater flow in sedimentary aquifer; Groundwater flow; Unconsolidated sediments; The Netherlands 1. Introduction Numerous studies carried out, 1081 HV Amsterdam, The Netherlands Abstract The impact of faults on the groundwater flow system

  11. A Qualitive Modeling Approach for Fault Detection and Diagnosis on HVAC Systems

    E-Print Network [OSTI]

    Muller, T.; Rehault, N.; Rist, T.

    2013-01-01T23:59:59.000Z

    This paper describes the basics and first test results of a model based approach using qualitative modeling to perform Fault Detection and Diagnostics (FDD) on HVAC and R systems. A quantized system describing the qualitative behavior of a...

  12. On-Line Fault Diagnosis of Dynamic Systems via Robust Parameter Identification Gerard Blocha

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    of faults, their isolation and their identification is presented. The systems considered are MISO systems the individual reliability of the different pieces of equipment, and by developing systematic preventive mainte

  13. System and method for bearing fault detection using stator current noise cancellation

    SciTech Connect (OSTI)

    Zhou, Wei (Los Angeles, CA); Lu, Bin (Kenosha, WI); Habetler, Thomas G. (Snellville, GA); Harley, Ronald G. (Lawrenceville, GA); Theisen, Peter J. (West Bend, WI)

    2010-08-17T23:59:59.000Z

    A system and method for detecting incipient mechanical motor faults by way of current noise cancellation is disclosed. The system includes a controller configured to detect indicia of incipient mechanical motor faults. The controller further includes a processor programmed to receive a baseline set of current data from an operating motor and define a noise component in the baseline set of current data. The processor is also programmed to repeatedly receive real-time operating current data from the operating motor and remove the noise component from the operating current data in real-time to isolate any fault components present in the operating current data. The processor is then programmed to generate a fault index for the operating current data based on any isolated fault components.

  14. System and method for motor fault detection using stator current noise cancellation

    DOE Patents [OSTI]

    Zhou, Wei (Los Angeles, CA); Lu, Bin (Kenosha, WI); Nowak, Michael P. (Menomonee Falls, WI); Dimino, Steven A. (Wauwatosa, WI)

    2010-12-07T23:59:59.000Z

    A system and method for detecting incipient mechanical motor faults by way of current noise cancellation is disclosed. The system includes a controller configured to detect indicia of incipient mechanical motor faults. The controller further includes a processor programmed to receive a baseline set of current data from an operating motor and define a noise component in the baseline set of current data. The processor is also programmed to acquire at least on additional set of real-time operating current data from the motor during operation, redefine the noise component present in each additional set of real-time operating current data, and remove the noise component from the operating current data in real-time to isolate any fault components present in the operating current data. The processor is then programmed to generate a fault index for the operating current data based on any isolated fault components.

  15. A new approach to lane guidance systems Andreas Eidehall Fredrik Gustafsson

    E-Print Network [OSTI]

    Gustafsson, Fredrik

    for estimating these parameters is used and the performance is improved by introducing a non-linear model which of test scenarios. It is also able to take control of the vehicle and put it in a safe position the lane markings with a vision system. They use a buzzer or a steering wheel torque to indicate or avoid

  16. Robust model-based fault diagnosis for chemical process systems

    E-Print Network [OSTI]

    Rajaraman, Srinivasan

    2006-08-16T23:59:59.000Z

    Fault detection and diagnosis have gained central importance in the chemical process industries over the past decade. This is due to several reasons, one of them being that copious amount of data is available from a large number of sensors...

  17. Robust model-based fault diagnosis for chemical process systems

    E-Print Network [OSTI]

    Rajaraman, Srinivasan

    2006-08-16T23:59:59.000Z

    Fault detection and diagnosis have gained central importance in the chemical process industries over the past decade. This is due to several reasons, one of them being that copious amount of data is available from a large ...

  18. System for detecting and limiting electrical ground faults within electrical devices

    DOE Patents [OSTI]

    Gaubatz, Donald C. (Cupertino, CA)

    1990-01-01T23:59:59.000Z

    An electrical ground fault detection and limitation system for employment with a nuclear reactor utilizing a liquid metal coolant. Elongate electromagnetic pumps submerged within the liquid metal coolant and electrical support equipment experiencing an insulation breakdown occasion the development of electrical ground fault current. Without some form of detection and control, these currents may build to damaging power levels to expose the pump drive components to liquid metal coolant such as sodium with resultant undesirable secondary effects. Such electrical ground fault currents are detected and controlled through the employment of an isolated power input to the pumps and with the use of a ground fault control conductor providing a direct return path from the affected components to the power source. By incorporating a resistance arrangement with the ground fault control conductor, the amount of fault current permitted to flow may be regulated to the extent that the reactor may remain in operation until maintenance may be performed, notwithstanding the existence of the fault. Monitors such as synchronous demodulators may be employed to identify and evaluate fault currents for each phase of a polyphase power, and control input to the submerged pump and associated support equipment.

  19. An integrated methodology for the performance and reliability evaluation of fault-tolerant systems

    E-Print Network [OSTI]

    Domnguez-Garca, Alejandro D. (Alejandro Dan)

    2007-01-01T23:59:59.000Z

    This thesis proposes a new methodology for the integrated performance and reliability evaluation of embedded fault-tolerant systems used in aircraft, space, tactical, and automotive applications. This methodology uses a ...

  20. Post-1906 stress recovery of the San Andreas fault system calculated from three-dimensional finite element analysis

    E-Print Network [OSTI]

    century as in the 19th century. In this paper I use finite element analysis to address the question, how element analysis Tom Parsons U.S. Geological Survey, Menlo Park, California, USA Received 23 August 2001 area seismic hazard assessment. This study presents a three-dimensional (3-D) finite element simulation

  1. Incipient fault detection and identification in process systems using artificial neural networks

    E-Print Network [OSTI]

    Muthusami, Jayakumar

    1992-01-01T23:59:59.000Z

    INCIPIENT FAULT DETECTION AND IDENTIFICATION IN PROCESS SYSTEMS USING ARTIFICIAL NEURAL NETWORKS A Thesis by JAYAKUMAR MUTHUSAMI Submitted to the Office of Graduate Studies of Texas A@M University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE December 1992 Major Subject: Mechanical Engineering INCIPIENT FAULT DETECTION AND IDENTIFICATION IN PROCESS SYSTEMS USING ARTIFICIAL NEURAL NETWORKS A Thesis JAYAKHMAH MUTHTJSAMI Approved a. s to style and content, by...

  2. Brain Organization and Computation Andreas Schierwagen

    E-Print Network [OSTI]

    Schierwagen, Andreas

    Brain Organization and Computation Andreas Schierwagen Institute for Computer Science, Intelligent://www.informatik.uni-leipzig.de/~schierwa Abstract. Theories of how the brain computes can be differentiated in three general conceptions systems approach. The discussion of key features of brain organization (i.e. structure with function

  3. Method and system for controlling a permanent magnet machine during fault conditions

    DOE Patents [OSTI]

    Krefta, Ronald John; Walters, James E.; Gunawan, Fani S.

    2004-05-25T23:59:59.000Z

    Method and system for controlling a permanent magnet machine driven by an inverter is provided. The method allows for monitoring a signal indicative of a fault condition. The method further allows for generating during the fault condition a respective signal configured to maintain a field weakening current even though electrical power from an energy source is absent during said fault condition. The level of the maintained field-weakening current enables the machine to operate in a safe mode so that the inverter is protected from excess voltage.

  4. Fault Analysis and Design Trade-Offs in Networked Cyber Physical Systems: A Formal Methods-Based

    E-Print Network [OSTI]

    Venkatasubramanian, Nalini

    -by-wire systems, Engine Controls, Power Systems, Sensor-controller-actuator systems Real-3meFault Analysis and Design Trade-Offs in Networked Cyber Physical SystemsJve: Integrated Fault and Performance Analysis Closed Loop Control Systems e.g., x

  5. An adaptive algorithm for the detection of high impedance faults on power distribution systems

    E-Print Network [OSTI]

    McCall, Kurt Eric

    1990-01-01T23:59:59.000Z

    of Science in Electrical Engineering. The objective is to design an adaptive algorithm that will automatically detect high impedance faults on a utility power distribution line or in other power systems. The algorithm is efficient enough to perform... it is impossible to have personnel continuously monitor many lines to detect these situations, an automated solution is needed. A fault detection device will have to be able to recognize abnormal situations by monitoring the electrical condition of the lines...

  6. Method and system for early detection of incipient faults in electric motors

    DOE Patents [OSTI]

    Parlos, Alexander G; Kim, Kyusung

    2003-07-08T23:59:59.000Z

    A method and system for early detection of incipient faults in an electric motor are disclosed. First, current and voltage values for one or more phases of the electric motor are measured during motor operations. A set of current predictions is then determined via a neural network-based current predictor based on the measured voltage values and an estimate of motor speed values of the electric motor. Next, a set of residuals is generated by combining the set of current predictions with the measured current values. A set of fault indicators is subsequently computed from the set of residuals and the measured current values. Finally, a determination is made as to whether or not there is an incipient electrical, mechanical, and/or electromechanical fault occurring based on the comparison result of the set of fault indicators and a set of predetermined baseline values.

  7. Abstract--The reliability and quality of power distribution systems are usually affected by many different distribution faults.

    E-Print Network [OSTI]

    Chow, Mo-Yuen

    1 Abstract--The reliability and quality of power distribution systems are usually affected by many and to provide a more effective fault restoration system. Index Terms-- power distribution systems, statistical analysis, tree-caused distribution faults. I. INTRODUCTION OWER systems play a very important role in our

  8. Fault tolerant control of automatically controlled vehicles in response to brake system failures

    E-Print Network [OSTI]

    Hsien, Li-Wei

    1998-01-01T23:59:59.000Z

    in the brake system is vital. In this thesis, nonlinear failure detection filters are used for fault detection of sensors and actuators in a class of nonlinear systems. In this thesis, the effects of brake system failures in an AHS where the vehicle steering...

  9. 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, Institute for Electrical Power Systems, Landgraf-Georg-Strae 4, 64283 Darmstadt, Germany * Ris National of the dynamic interaction between variable speed DFIG wind turbines and the power system subjected

  10. Fault tolerant control of automatically controlled vehicles in response to brake system failures

    E-Print Network [OSTI]

    Hsien, Li-Wei

    1998-01-01T23:59:59.000Z

    in the brake system is vital. In this thesis, nonlinear failure detection filters are used for fault detection of sensors and actuators in a class of nonlinear systems. In this thesis, the effects of brake system failures in an AHS where the vehicle steering...

  11. Observer-based fault detection for nuclear reactors

    E-Print Network [OSTI]

    Li, Qing, 1972-

    2001-01-01T23:59:59.000Z

    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 ...

  12. An Energy-Aware Fault Tolerant Scheduling Framework for Soft Error Resilient Cloud Computing Systems

    E-Print Network [OSTI]

    Pedram, Massoud

    . INTRODUCTION Soft error resiliency has become a major concern for modern computing systems as CMOS technology systems [8, 9]. Although it is impossible to entirely eliminate spontaneous soft errors, they canAn Energy-Aware Fault Tolerant Scheduling Framework for Soft Error Resilient Cloud Computing

  13. Fault Current Issues for Market Driven Power Systems with Distributed Generation

    E-Print Network [OSTI]

    are required for the selection of interruption devices, protective relays, and their coordination. Systems must Terms--Distributed / dispersed generation, power distri- bution, power system protection, fault in siting conventional generation but, for whatever reason, protection engineers as well as transmission

  14. Model Driven Configuration of Fault Tolerance Solutions for Component-Based Software System

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    - tural meta-model. Then, the impact of each component on the system reliability is automatically analyzedModel Driven Configuration of Fault Tolerance Solutions for Component-Based Software System Yihan Technologies (Ministry of Education) 2 School of Electronic Engineering & Computer Science, Peking University

  15. A Brief Status on Condition Monitoring and Fault Diagnosis in Wind Energy Conversion Systems

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    A Brief Status on Condition Monitoring and Fault Diagnosis in Wind Energy Conversion Systems--There is a constant need for the reduction of operational and maintenance costs of Wind Energy Conversion Systems since they are situated on extremely high towers, which are normally 20 m or more in height

  16. Condition Monitoring and Fault Diagnosis in Wind Energy Conversion Systems: A Review

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Condition Monitoring and Fault Diagnosis in Wind Energy Conversion Systems: A Review Y. Amirat, M for the reduction of operational and maintenance costs of Wind Energy Conversion Systems (WECS). The most efficient they are situated on extremely high towers, which are normally 20 m or greater in height. There are also plans

  17. 1062 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 22, NO. 3, MAY 2007 Fault Diagnostic System for a Multilevel

    E-Print Network [OSTI]

    Tolbert, Leon M.

    level dc voltage sources which would be available from batteries or fuel cells [1]. A schematic1062 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 22, NO. 3, MAY 2007 Fault Diagnostic System Member, IEEE Abstract--In this paper, a fault diagnostic system in a multi- level-inverter using a neural

  18. Final Project Report: Self-Correcting Controls for VAV System Faults Filter/Fan/Coil and VAV Box Sections

    SciTech Connect (OSTI)

    Brambley, Michael R.; Fernandez, Nicholas; Wang, Weimin; Cort, Katherine A.; Cho, Heejin; Ngo, Hung; Goddard, James K.

    2011-05-01T23:59:59.000Z

    This report addresses original research by the Pacific Northwest National Laboratory for the California Institute for Energy and Environment on self-correcting controls for variable-air-volume (VAV) heating, ventilating and air-conditioning systems and focuses specifically on air handling and VAV box components of the air side of the system. A complete set of faults for these components was compiled and a fault mode analysis performed to understand the detectable symptoms of the faults and the chain of causation. A set of 26 algorithms was developed to facilitate the automatic correction of these faults in typical commercial VAV systems. These algorithms include training tests that are used during commissioning to develop models of normal system operation, passive diagnostics used to detect the symptoms of faults, proactive diagnostics used to diagnose the cause of a fault, and finally fault correction algorithms. Ten of the twenty six algorithms were implemented in a prototype software package that interfaces with a test bed facility at PNNL's Richland, WA, laboratory. Measurement bias faults were instigated in the supply-air temperature sensor and the supply-air flow meter to test the algorithms developed. The algorithms as implemented in the laboratory software correctly detected, diagnosed and corrected these faults. Finally, an economic and impact assessment was performed for the State of California for deployment of self-correcting controls. Assuming 15% HVAC energy savings and a modeled deployment profile, 3.1-5.8 TBu of energy savings are possible by year 15.

  19. Rupture Dynamics of Strike-Slip Faults with Stepovers: From Conceptually Simplified to Realistically Complex Fault Systems

    E-Print Network [OSTI]

    Liu, Zaifeng

    2014-05-05T23:59:59.000Z

    , the Aksay double-bend in the Altyn Tagh fault, and its ability to stop the dynamic rupture. A detailed parameter-space study has been performed in the simplified model. From the single fault test, I find that the Positive Coulomb Stress (PCS) region...

  20. Biography Andreas Hampel

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041clothAdvanced Materials Advanced Materials Find Find More LikeAndreas Hampel Dr. Hampel will be

  1. Study of the non-linear dynamic response of a rotor system with faults and uncertainties

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of the non-linear re- sponse in rotor systems with multi-faults (such as unbalance, asymmetric shaft, bow and Ferraris in fixed frame [10]. · The bow is an initial deformation of the rotor which can be caused) or all parts of the rotor (extended bow). Darpe [12] proposes to investigate the influence of a bow

  2. Significant Earthquakes on the Enriquillo Fault System, Hispaniola, 15002010: Implications for Seismic Hazard

    E-Print Network [OSTI]

    ten Brink, Uri S.

    Significant Earthquakes on the Enriquillo Fault System, Hispaniola, 1500­2010: Implications, particularly on the island of Hispaniola. We use accounts of historical earthquakes to assign intensities for Hispaniola. The intensity assignments and the attenuation relation are used in a grid search to find source

  3. Evaluating the Effectiveness of Fault Tolerance in Replicated Database Management Systems

    E-Print Network [OSTI]

    -Olaf.Hvasshovd@idi.ntnu.no Abstract Database management systems (DBMS) achieve high availabilityand faulttolerance usuallyby of this study is two-fold. It eval- uates the effectiveness of DBMS fault tolerance in the pres- ence on database integrity, performance, and availability on a replicated DBMS, ClustRa[6], in the presence

  4. Fault diagnostics in power electronics-based brake-by-wire systems

    E-Print Network [OSTI]

    Mi, Chunting "Chris"

    in depth. Fault diagnostics technology for internal combustion engine vehicles has been well investigated and validated using data from both a simulation and a laboratory set-up with a 1=3 hp d.c. motor and a d and the results are presented. The hierarchical fuzzy diagnostic system trained on the simulated model has

  5. April, 30 2005 Aspen, Colorado Andreas Haungs KASCADE-Grande Collaboration `Physics from the Knee to the Ankle Investigating the 2nd Knee

    E-Print Network [OSTI]

    April, 30 2005 Aspen, Colorado Andreas Haungs KASCADE-Grande Collaboration `Physics from@ik.fzk.de Forschungszentrum Karlsruhe in der Helmholtzgemeinschaft #12;April, 30 2005 Aspen, Colorado Andreas Haungs of observables multi-detector system #12;April, 30 2005 Aspen, Colorado Andreas Haungs KASCADE

  6. IAEI NEWS January.February 2008 www.iaei.org ground-fault protection for pv systems

    E-Print Network [OSTI]

    Johnson, Eric E.

    IAEI NEWS January.February 2008 www.iaei.org ground-fault protection for pv systems O nce upon was elaborating on the ex- cellence of their photovoltaic (PV) test facility in the distant Land of Enchantment. They showed some se- nior firefighters a picture of a burned PV module that had been subject to a ground fault

  7. Submission to International Journal of Control, Automation and Systems Vol. , No. , 1 Robust Fault Detection and Estimation for Descriptor Systems

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    in a large class of technical process like mechanical, electrical and chemical systems [3,17]. With regard of the proposed fault detection and estimation method is successfully applied to an electrical circuit. Keywords lead to significant performance degradation, serious system damages and even loss of human life

  8. andreas michael klein: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Critical Industrial Robot Programming Andreas Schierl, Andreas Angerer, Alwin Hoffmann, Michael Vistein and Wolfgang Reif Computer Technologies and Information Sciences...

  9. Distribution of the right-lateral strikeslip motion from the Main Recent Fault to the Kazerun Fault System (Zagros, Iran): Evidence from present-day GPS velocities

    E-Print Network [OSTI]

    Hatzfeld, Denis

    Fault System (Zagros, Iran): Evidence from present-day GPS velocities F. Tavakoli a,b , A. Walpersdorf a Center, Meraj Ave. Azadi Sq., P.O.Box 13185-1684, Tehran, Iran c CEREGE, CNRS, Université Aix-Marseille-3 Institute for Earthquake Engineering and Seismology, P.O. Box 19395/3913, Tehran, Iran e Institut de

  10. Automatic Channel Fault Detection and Diagnosis System for a Small Animal APD-Based Digital PET Scanner

    E-Print Network [OSTI]

    Jonathan Charest; Jean-Franois Beaudoin; Jules Cadorette; Roger Lecomte; Charles-Antoine Brunet; Rjean Fontaine

    2014-06-16T23:59:59.000Z

    Fault detection and diagnosis is critical to many applications in order to ensure proper operation and performance over time. Positron emission tomography (PET) systems that require regular calibrations by qualified scanner operators are good candidates for such continuous improvements. Furthermore, for scanners employing one-to-one coupling of crystals to photodetectors to achieve enhanced spatial resolution and contrast, the calibration task is even more daunting because of the large number of independent channels involved. To cope with the additional complexity of the calibration and quality control procedures of these scanners, an intelligent system (IS) was designed to perform fault detection and diagnosis (FDD) of malfunctioning channels. The IS can be broken down into four hierarchical modules: parameter extraction, channel fault detection, fault prioritization and diagnosis. Of these modules, the first two have previously been reported and this paper focuses on fault prioritization and diagnosis. The purpose of the fault prioritization module is to help the operator to zero in on the faults that need immediate attention. The fault diagnosis module will then identify the causes of the malfunction and propose an explanation of the reasons that lead to the diagnosis. The FDD system was implemented on a LabPET avalanche photodiode (APD)-based digital PET scanner. Experiments demonstrated a FDD Sensitivity of 99.3 % (with a 95% confidence interval (CI) of: [98.7, 99.9]) for major faults. Globally, the Balanced Accuracy of the diagnosis for varying fault severities is 92 %. This suggests the IS can greatly benefit the operators in their maintenance task.

  11. A Comparison of Fault Detection Methods For a Transcritical Refrigeration System

    E-Print Network [OSTI]

    Janecke, Alex Karl

    2012-10-19T23:59:59.000Z

    pairings of four faults: over/undercharge, evaporator fouling, gas cooler fouling, and compressor valve leakage. This technique allows for low cost measurement and independent detection of individual faults even when multiple faults are present. Results...

  12. Microprocessor-based fault-tolerant reactor control and information system

    SciTech Connect (OSTI)

    Kakehi, A.; Okutani, T.; Sakamoto, H. (Toshiba Corp., Fuji City (Japan))

    1990-03-01T23:59:59.000Z

    The Reactor Manual Control system (RMCS) and the Rod Position Information system (RPIS), applied to the boiling water reactor (BWR) power plants, areas among the most important systems in controlling the output of nuclear reactor power. Improvement in reliability of the RMCS and RPIS is thus highly important for availability during plant operation. This paper presents a highly reliable RMCS and RPIS employing microprocessors. The developed equipment has been made fault-tolerant by adopting redundancy of each system. The amount of cabling normally required has been reduced by multiplexing transmission via fiber-optic cable. The size of the control panel has been reduced and maintainability improved.

  13. Fault Detection and Diagnosis in Building HVAC Systems

    E-Print Network [OSTI]

    Najafi, Massieh

    2010-01-01T23:59:59.000Z

    Wright, Condition monitoring in HVAC subsystems using firstmonitoring packaged HVAC equipment. ASHRAE Transactions,Detection and Diagnosis of HVAC Systems Using Support Vector

  14. Nonlinear Estimation for Model Based Fault Diagnosis of Nonlinear Chemical Systems

    E-Print Network [OSTI]

    Qu, Chunyan

    2011-02-22T23:59:59.000Z

    . . . . . . . . . . . . . . . . . . . . 84 xii TABLE Page XV MSEs for Algorithms (?t = 0.02,R = 0.01I) for EKF Imple- mentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 XVI Summary of MSEs for All Algorithms for EKF Implementations 93 XVII MSEs for Algorithms with a...-dimensional states while Li and Kadirkamanathan [79] investigated the PF based likelihood ratio ap- proach to fault diagnosis in nonlinear stochastic systems. T. Chen and his coworkers used particle filters for dynamic data rectification and process change detection...

  15. The characteristics of arcing faults in 480-volt power distribution systems

    E-Print Network [OSTI]

    Shih, Yu?

    1994-01-01T23:59:59.000Z

    December 1994 Major Subject: Electrical Engineering THE CHARACTERISTICS OF ARCING FAULTS IN 480-VOLT POWER DISTRIBUTION SYSTEMS A Thesis by YU SHI Submitted to Texas ARM University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE Approved as to style and content by: B. Don Russell (Chair of Committee) . M. Hua g (Member) , 24 . Yurt (Member) M. Kezunovic (Member) A. D. Patton (Head of Department) December 1994 Major Subject; Electrical Engineering...

  16. Risk Assessment of Railway Transportation Systems using Timed Fault Trees

    E-Print Network [OSTI]

    Miller, Alice

    Lyub, , Alice Millerb , Chris Johnsonb , Tingdi Zhaoa a School of Reliability and Systems Engineering. Introduction System safety relies on robust safety design, good management, and e - cient maintenance [1, University of Glasgow, Glasgow, United Kingdom Abstract Safety is an essential requirement for railway

  17. Risk Assessment of Railway Transportation Systems using Timed Fault Trees

    E-Print Network [OSTI]

    Miller, Alice

    Lub, , Alice Millerb , Chris Johnsonb , Tingdi Zhaoa a School of Reliability and Systems Engineering. Introduction System safety relies on robust safety design, good management, and effi- cient maintenance [1, University of Glasgow, Glasgow, United Kingdom Abstract Safety is an essential requirement for railway

  18. Software Fault Reporting Processes in Business-Critical Systems

    E-Print Network [OSTI]

    Langseth, Helge

    and product quality. Some specific software methods will be adopted from safety-critical software engineering of Computer and Information Science Faculty of Information Technology, Mathematics and Electrical Engineering and software systems. To increase e.g. the reliability and performance of such systems we rely on a plethora

  19. Wireless reconfigurability of fault-tolerant processing systems

    E-Print Network [OSTI]

    Tang, Melinda Y

    2008-01-01T23:59:59.000Z

    This thesis examines the use of wireless data buses for communication in a real-time computer system designed for applications with high reliability requirements. This work is based on the Draper Laboratory Software Based ...

  20. Casimir Effect and Trace formula Andreas Wirzba

    E-Print Network [OSTI]

    Wirzba, Andreas - Helmholtz-Institut fr Strahlen- und Kernphysik (HISKP)

    1 Casimir Effect and Trace formula Andreas Wirzba Institut fur Kernphysik Forschungszentrum Julich Andreas Wirzba Casimir effect and trace formula Copenhagen, 17 May 2006 #12;1 Casimir Effect and Trace formula Andreas Wirzba Institut fur Kernphysik Forschungszentrum Julich 1. Introduction to the Casimir

  1. (m,n)-Semirings and a Generalized Fault Tolerance Algebra of Systems

    E-Print Network [OSTI]

    Syed Eqbal Alam; Shrisha Rao; Bijan Davvaz

    2013-02-07T23:59:59.000Z

    We propose a new class of mathematical structures called (m,n)-semirings} (which generalize the usual semirings), and describe their basic properties. We also define partial ordering, and generalize the concepts of congruence, homomorphism, ideals, etc., for (m,n)-semirings. Following earlier work by Rao, we consider a system as made up of several components whose failures may cause it to fail, and represent the set of systems algebraically as an (m,n)-semiring. Based on the characteristics of these components we present a formalism to compare the fault tolerance behaviour of two systems using our framework of a partially ordered (m,n)-semiring.

  2. Local rollback for fault-tolerance in parallel computing systems

    DOE Patents [OSTI]

    Blumrich, Matthias A. (Yorktown Heights, NY); Chen, Dong (Yorktown Heights, NY); Gara, Alan (Yorktown Heights, NY); Giampapa, Mark E. (Yorktown Heights, NY); Heidelberger, Philip (Yorktown Heights, NY); Ohmacht, Martin (Yorktown Heights, NY); Steinmacher-Burow, Burkhard (Boeblingen, DE); Sugavanam, Krishnan (Yorktown Heights, NY)

    2012-01-24T23:59:59.000Z

    A control logic device performs a local rollback in a parallel super computing system. The super computing system includes at least one cache memory device. The control logic device determines a local rollback interval. The control logic device runs at least one instruction in the local rollback interval. The control logic device evaluates whether an unrecoverable condition occurs while running the at least one instruction during the local rollback interval. The control logic device checks whether an error occurs during the local rollback. The control logic device restarts the local rollback interval if the error occurs and the unrecoverable condition does not occur during the local rollback interval.

  3. A SUBSPACE APPROACH TO FAULT DIAGNOSTICS IN LARGE POWER SYSTEMS

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    and to fast detect and identify possible failures. In this article, we focus on failures in power lines which translate in sudden changes in the electric impedance. To keep track of the current flowing in the line), transmission line states are only refreshed on an hourly basis [1]. For rather static systems, the au- thors

  4. Modeling and Verification for Timing Satisfaction of Fault-Tolerant Systems with Finiteness

    E-Print Network [OSTI]

    Cheng, Chih-Hong; Esparza, Javier; Knoll, Alois

    2009-01-01T23:59:59.000Z

    The increasing use of model-based tools enables further use of formal verification techniques in the context of distributed real-time systems. To avoid state explosion, it is necessary to construct a verification model that focuses on the aspects under consideration. In this paper, we discuss how we construct a verification model for timing analysis in distributed real-time systems. We (1) give observations concerning restrictions of timed automata to model these systems, (2) formulate mathematical representations how to perform model-to-model transformation to derive verification models from system models, and (3) propose some theoretical criteria how to reduce the model size. The latter is in particular important, as for the verification of complex systems, an efficient model reflecting the properties of the system under consideration is equally important to the verification algorithm itself. Finally, we present an extension of the model-based development tool FTOS, designed to develop fault-tolerant system...

  5. UAS remote sensing missions for rangeland applications Andrea S. Lalibertea

    E-Print Network [OSTI]

    UAS remote sensing missions for rangeland applications Andrea S. Lalibertea *, Craig Wintersb surface, are in remote areas and have low population densities, all of which provide an ideal opportunity for remote sensing applications from unmanned aircraft systems (UAS). In this article, we describe a proven

  6. Decentralized Generic Rigidity Evaluation in Interconnected Systems Ryan K. Williams, Andrea Gasparri, Attilio Priolo, and Gaurav S. Sukhatme

    E-Print Network [OSTI]

    Sukhatme, Gaurav S.

    -agent solutions. Various impactful applications of such systems have been demonstrated, including monitoring [1], target tracking [2], and environmental sensing [3]. Of particular interest in this work is the evaluation

  7. Application of black-box models to HVAC systems for fault detection

    SciTech Connect (OSTI)

    Peitsman, H.C. [TNO Building and Construction Research, Delft (Netherlands). Dept. of Indoor Environment, Building Physics and Systems; Bakker, V.E. [Univ. of Twente, Enschede (Netherlands). Dept. of Computer Science

    1996-11-01T23:59:59.000Z

    This paper describes the application of black-box models for fault detection and diagnosis (FDD) in heating, ventilating, and air-conditioning (HVAC) systems. In this study, multiple-input/single-output (MISO) ARX models and artificial neural network (ANN) models are used. The ARX models are examined for different processes and subprocesses and compared with each other. Two types of models are established--system models and component models. In the case of system models, the HVAC system as a whole is regarded as a black box instead of as a collection of component models. With the component model type, the components of the HVAC system are regarded as separate black boxes.

  8. QER- Comment of Andrea Wert

    Broader source: Energy.gov [DOE]

    Hello, I attended the event "Electricity in Transition" at CSIS on May 8th where Ms. Melanie Kenderdine spoke. I was hoping to review the powerpoint Ms. Kenderdine used in her presentation on the Adminstrations QER. Would it be possible to obtain a copy of that presentation? Thank you! Best, Andrea Wert

  9. Fault Tolerant Reliable Delivery of Events in Distributed Middleware Systems Shrideep Pallickara, Geoffrey Fox and Hasan Bulut

    E-Print Network [OSTI]

    Fault Tolerant Reliable Delivery of Events in Distributed Middleware Systems Shrideep Pallickara interchangeably) is an important problem that needs to be addressed in distributed systems. Increasingly, interactions between entities within a distributed system are encapsulated in events. In this paper we present

  10. Fault-Tolerant Reliable Delivery of Messages in Distributed Publish/Subscribe Systems Shrideep Pallickara, Hasan Bulut and Geoffrey Fox

    E-Print Network [OSTI]

    1/10 Fault-Tolerant Reliable Delivery of Messages in Distributed Publish/Subscribe Systems Shrideep in distributed systems. In this paper we present our strategy to enable reliable delivery of messages. Messaging is a critical component in distributed systems. Here, the messaging infrastructure can be based

  11. Combined expert system/neural networks method for process fault diagnosis

    DOE Patents [OSTI]

    Reifman, J.; Wei, T.Y.C.

    1995-08-15T23:59:59.000Z

    A two-level hierarchical approach for process fault diagnosis of an operating system employs a function-oriented approach at a first level and a component characteristic-oriented approach at a second level, where the decision-making procedure is structured in order of decreasing intelligence with increasing precision. At the first level, the diagnostic method is general and has knowledge of the overall process including a wide variety of plant transients and the functional behavior of the process components. An expert system classifies malfunctions by function to narrow the diagnostic focus to a particular set of possible faulty components that could be responsible for the detected functional misbehavior of the operating system. At the second level, the diagnostic method limits its scope to component malfunctions, using more detailed knowledge of component characteristics. Trained artificial neural networks are used to further narrow the diagnosis and to uniquely identify the faulty component by classifying the abnormal condition data as a failure of one of the hypothesized components through component characteristics. Once an anomaly is detected, the hierarchical structure is used to successively narrow the diagnostic focus from a function misbehavior, i.e., a function oriented approach, until the fault can be determined, i.e., a component characteristic-oriented approach. 9 figs.

  12. Combined expert system/neural networks method for process fault diagnosis

    DOE Patents [OSTI]

    Reifman, Jaques (Westchester, IL); Wei, Thomas Y. C. (Downers Grove, IL)

    1995-01-01T23:59:59.000Z

    A two-level hierarchical approach for process fault diagnosis is an operating system employs a function-oriented approach at a first level and a component characteristic-oriented approach at a second level, where the decision-making procedure is structured in order of decreasing intelligence with increasing precision. At the first level, the diagnostic method is general and has knowledge of the overall process including a wide variety of plant transients and the functional behavior of the process components. An expert system classifies malfunctions by function to narrow the diagnostic focus to a particular set of possible faulty components that could be responsible for the detected functional misbehavior of the operating system. At the second level, the diagnostic method limits its scope to component malfunctions, using more detailed knowledge of component characteristics. Trained artificial neural networks are used to further narrow the diagnosis and to uniquely identify the faulty component by classifying the abnormal condition data as a failure of one of the hypothesized components through component characteristics. Once an anomaly is detected, the hierarchical structure is used to successively narrow the diagnostic focus from a function misbehavior, i.e., a function oriented approach, until the fault can be determined, i.e., a component characteristic-oriented approach.

  13. Multi-sensor Wireless System for Fault Detection in Induction Motors

    E-Print Network [OSTI]

    Tarkesh Esfahani, Ehsan

    2012-01-01T23:59:59.000Z

    Rotor bar damage and Stator winding imbalance, in the fault3) Bearing damage 4) Stator winding imbalance [2]. These

  14. Security and Fault-tolerance in Distributed Systems ETHZ, Spring 2013 Christian Cachin, IBM Research -Zurich www.zurich.ibm.com/~cca/

    E-Print Network [OSTI]

    Cachin, Christian

    Security and Fault-tolerance in Distributed Systems ETHZ, Spring 2013 Christian Cachin, IBM and secure distributed systems. Exploit replication as the primary means to tolerate faults. Describe. Dependability 2. Reliable broadcast 3. Distributed storage 4. Consensus 5. System examples 6. Distributed

  15. Insights From Laboratory Experiments On Simulated Faults With Application To Fracture Evolution In Geothermal Systems

    SciTech Connect (OSTI)

    Stephen L. Karner, Ph.D

    2006-06-01T23:59:59.000Z

    Laboratory experiments provide a wealth of information related to mechanics of fracture initiation, fracture propagation processes, factors influencing fault strength, and spatio-temporal evolution of fracture properties. Much of the existing literature reports on laboratory studies involving a coupling of thermal, hydraulic, mechanical, and/or chemical processes. As these processes operate within subsurface environments exploited for their energy resource, laboratory results provide insights into factors influencing the mechanical and hydraulic properties of geothermal systems. I report on laboratory observations of strength and fluid transport properties during deformation of simulated faults. The results show systematic trends that vary with stress state, deformation rate, thermal conditions, fluid content, and rock composition. When related to geophysical and geologic measurements obtained from engineered geothermal systems (e.g. microseismicity, wellbore studies, tracer analysis), laboratory results provide a means by which the evolving thermal reservoir can be interpreted in terms of physico-chemical processes. For example, estimates of energy release and microearthquake locations from seismic moment tensor analysis can be related to strength variations observed from friction experiments. Such correlations between laboratory and field data allow for better interpretations about the evolving mechanical and fluid transport properties in the geothermal reservoir ultimately leading to improvements in managing the resource.

  16. Bulletin of the Seismological Society of America Significant Earthquakes on the Enriquillo Fault System, Hispaniola, 1500-2010

    E-Print Network [OSTI]

    ten Brink, Uri S.

    System, Hispaniola, 1500-2010: Implications for Seismic Hazard --Manuscript Draft-- Manuscript Number Earthquakes on the Enriquillo Fault System, Hispaniola, 1500-2010: Implications for Seismic Hazard the past 500 years, particularly on the island of Hispaniola. We use accounts of historical earthquakes

  17. Optimal fault location

    E-Print Network [OSTI]

    Knezev, Maja

    2009-05-15T23:59:59.000Z

    are triggered. Protection system consisting of protection relays and circuit breakers (CBs) will operate in order to de-energize faulted line. Different Intelligent Electronic Devices (IEDs) located in substations for the purpose of monitoring... in the control center by an operator who will mark fault event in a spreadsheet and inform other staff responsible for dealing with fault analysis and repair such as protection group or maintenance respectively. Protective relaying staff will be ready...

  18. Optimal fault location

    E-Print Network [OSTI]

    Knezev, Maja

    2008-10-10T23:59:59.000Z

    are triggered. Protection system consisting of protection relays and circuit breakers (CBs) will operate in order to de-energize faulted line. Different Intelligent Electronic Devices (IEDs) located in substations for the purpose of monitoring... in the control center by an operator who will mark fault event in a spreadsheet and inform other staff responsible for dealing with fault analysis and repair such as protection group or maintenance respectively. Protective relaying staff will be ready...

  19. Security and Fault-tolerance in Distributed Systems ETHZ, Spring 2012 Christian Cachin, IBM Research -Zurich www.zurich.ibm.com/~cca/

    E-Print Network [OSTI]

    Cachin, Christian

    , reduced airflow = error, no cooling = failure. Power supply system: no cooling = fault, overheating, fan in power supply congested by dust, airflow massively reduced, fan not effective, power supply = error, loss of power = failure. Computer system: broken power supply = fault, no power on mainboard

  20. Security and Fault-tolerance in Distributed Systems ETHZ, Spring 2013 Christian Cachin, IBM Research -Zurich www.zurich.ibm.com/~cca/

    E-Print Network [OSTI]

    Cachin, Christian

    , reduced airflow = error, no cooling = failure. Power supply system: no cooling = fault, overheating, fan in power supply congested by dust, airflow massively reduced, fan not effective, power supply = error, loss of power = failure. Computer system: broken power supply = fault, no power on mainboard

  1. Security and Fault-tolerance in Distributed Systems ETHZ, Spring 2012 Christian Cachin, IBM Research -Zurich www.zurich.ibm.com/~cca/

    E-Print Network [OSTI]

    Cachin, Christian

    Security and Fault-tolerance in Distributed Systems ETHZ, Spring 2012 Christian Cachin, IBM and secure distributed systems. Exploit replication as the primary means to tolerate faults. Describe. Dependability 2. Communication primitives 3. Reliable broadcast 4. Distributed storage 5. Consensus 6

  2. Area balance and strain in an extensional fault system: Strategies for improved oil recovery in fractured chalk, Gilbertown Field, southwestern Alabama. Annual report, March 1996--March 1997

    SciTech Connect (OSTI)

    Pashin, J.C.; Raymond, D.E.; Rindsberg, A.K.; Alabi, G.G.; Groshong, R.H.

    1997-08-01T23:59:59.000Z

    Gilbertown Field is the oldest oil field in Alabama and produces oil from chalk of the Upper Cretaceous Selma Group and from sandstone of the Eutaw Formation along the southern margin of the Gilbertown fault system. Most of the field has been in primary recovery since establishment, but production has declined to marginally economic levels. This investigation applies advanced geologic concepts designed to aid implementation of improved recovery programs. The Gilbertown fault system is detached at the base of Jurassic salt. The fault system began forming as a half graben and evolved in to a full graben by the Late Cretaceous. Conventional trapping mechanisms are effective in Eutaw sandstone, whereas oil in Selma chalk is trapped in faults and fault-related fractures. Burial modeling establishes that the subsidence history of the Gilbertown area is typical of extensional basins and includes a major component of sediment loading and compaction. Surface mapping and fracture analysis indicate that faults offset strata as young as Miocene and that joints may be related to regional uplift postdating fault movement. Preliminary balanced structural models of the Gilbertown fault system indicate that synsedimentary growth factors need to be incorporated into the basic equations of area balance to model strain and predict fractures in Selma and Eutaw reservoirs.

  3. Journal of Power Sources 165 (2007) 267278 A Bayesian network fault diagnostic system for proton

    E-Print Network [OSTI]

    Simes, Marcelo Godoy

    2007-01-01T23:59:59.000Z

    exchange membrane fuel cells Luis Alberto M. Riascosa,, Marcelo G. Simoesb, Paulo E. Miyagic a Federal considers the effects of different types of faults on a proton exchange membrane fuel cell model (PEMFC. 2006 Elsevier B.V. All rights reserved. Keywords: Bayesian networks; Fault diagnosis; Fuel cells 1

  4. Modeling and Analysis of Safety-Critical Cyber Physical Systems using State/Event Fault Trees

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    . Keywords: reliability modeling, risk analysis, attack trees, fault tree, State/Event Fault Tree 1 to their ability to capture qualitative and quantitative analysis aspects they can be seen as state of the art and it is not possible to do a quantitative analysis of them in case of statistical depend basic events. In [6] Kaiser et

  5. Andrea Spikes | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742 33Frequently20,000 RussianBy:Whether you're a16-17,2-13) AllDepartment of EnergyAnatomy ofAndrea

  6. A system-of-systems framework of Nuclear Power Plant Probabilistic Seismic Hazard Analysis by Fault Tree analysis and Monte Carlo simulation

    E-Print Network [OSTI]

    Boyer, Edmond

    simulation. As outcome of the analysis, the probability that the nuclear power plant reaches an unsafe stateA system-of-systems framework of Nuclear Power Plant Probabilistic Seismic Hazard Analysis by Fault consider the impacts produced on a nuclear power plant (the critical plant) embedded in the connected power

  7. Fault tolerant control allocation in systems with fixed magnitude discrete controls

    E-Print Network [OSTI]

    Marwaha, Monika

    2009-05-15T23:59:59.000Z

    The promise and potential of controllers that can reconfigure themselves in the case of control effector failures and uncertainties, and yet guarantee stability and provide satisfactory performance, has led to fault tolerant control being an active...

  8. On-line implementation of a fault diagnosis system for three-phase induction motors

    E-Print Network [OSTI]

    Alladi, Vijaya Mallikarjun

    2002-01-01T23:59:59.000Z

    regarding the health of the motor and automates the monitoring process. Negative sequence components and the root mean square of the harmonics of the current residuals are used as indicators for identifying electrical and mechanical faults in the motor...

  9. Integrating Reliability into the Design of Fault-Tolerant Power Electronics Systems

    E-Print Network [OSTI]

    Liberzon, Daniel

    , tactical, and automotive applications, mandates that the design functions be performed even in the presence reliability block diagrams [3], failure modes and effects analysis (FMEA) [4], fault trees [5], and Markov

  10. Fault-Aware, Utility-Based Job Scheduling on Blue Gene/P Systems

    E-Print Network [OSTI]

    Lan, Zhiling

    for scheduling such as utilization rates and average response times have long been used to assess scheduler the balance between responsiveness and utilization rate on a dynamic basis. Further, we have developed a fault

  11. Efficient Detection on Stochastic Faults in PLC Based Automated Assembly Systems With Novel Sensor Deployment and Diagnoser Design

    E-Print Network [OSTI]

    Wu, Zhenhua

    2012-07-16T23:59:59.000Z

    Programming FMEA Failure Mode Effect Analysis AHP Analytical Hierarchy Process MILP Mixed Integer Linear Programming IPN Interpreted Petri Net CTPN Colored Timed Petri Net FPN Fuzzy Petri Net MOM Mean of Maximum COA Center of Area RTFPN Real Time... and target multiple objectives; 2) design a Petri net (PN) diagnoser for detecting stochastic faults in realtime; and 3) evaluate the proposed sensor deployment and diagnoser in a PLC controlled manufacturing system. FMEA Sensor Deployment Model...

  12. 1158 IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, VOL. 14, NO. 6, NOVEMBER 2006 Nonlinear Fault Detection and Isolation in a Three-Tank Heating System

    E-Print Network [OSTI]

    De Luca, Alessandro

    the linear-in-the-parameter nature of the model (as in [11] for a distillation column). Robust fault in detail the modeling procedure, the synthesis of residual generators, and the design of a combinatorial to the model-based design of FDI systems have been proposed in the literature, e.g., based on Kalman fil- ters

  13. System Support for Software Fault Tolerance in Highly Available Database Management Systems

    E-Print Network [OSTI]

    California at Irvine, University of

    of several techniques for early error detection and fast recovery in a database management system (DBMS system and the IMS DBMS and DB2 DBMS. The study classifies errors by the type of coding mistake system allow the DBMS to guard (write-protect) #12;2 some of its internal data structures. Guarding DBMS

  14. Effect of neglecting resistance in calculations of short circuit faults on power systems

    E-Print Network [OSTI]

    Mayo, Samuel Jonathan

    1948-01-01T23:59:59.000Z

    of Conductor B. Ef feet of Locat ion of i"ault C. Effect of Generator Impedances Effect of ". utual Impedance in Overhead ircuits E. 'ffect of Ground '&!res F. Effect of Type of Fault 1. Line to Line Fault 2, D&uble Line to Ground Fault Single Line...) Configuration of conductorS Fig. P . 59Ste, m 1. Two overheaci circu (rs with mutual coupling 12 IO t GEOAf ETR IC PER IV DIsT~NGE OF GRovND o' I RE F Ro III Co N D v c 7'ORS ~ 20 )(Io f 25 )(lo + fog FEET {a) One ground wire to 10 GEOM KTR I C...

  15. The importance of input variables to a neural network fault-diagnostic system for nuclear power plants

    SciTech Connect (OSTI)

    Lanc, T.L.

    1992-01-01T23:59:59.000Z

    This thesis explores safety enhancement for nuclear power plants. Emergency response systems currently in use depend mainly on automatic systems engaging when certain parameters go beyond a pre-specified safety limit. Often times the operator has little or no opportunity to react since a fast scram signal shuts down the reactor smoothly and efficiently. These accidents are of interest to technical support personnel since examining the conditions that gave rise to these situations help determine causality. In many other cases an automated fault-diagnostic advisor would be a valuable tool in assisting the technicians and operators to determine what just happened and why.

  16. The importance of input variables to a neural network fault-diagnostic system for nuclear power plants

    SciTech Connect (OSTI)

    Lanc, T.L.

    1992-12-31T23:59:59.000Z

    This thesis explores safety enhancement for nuclear power plants. Emergency response systems currently in use depend mainly on automatic systems engaging when certain parameters go beyond a pre-specified safety limit. Often times the operator has little or no opportunity to react since a fast scram signal shuts down the reactor smoothly and efficiently. These accidents are of interest to technical support personnel since examining the conditions that gave rise to these situations help determine causality. In many other cases an automated fault-diagnostic advisor would be a valuable tool in assisting the technicians and operators to determine what just happened and why.

  17. Rachel Struglia Patricia L. Winter Andrea Meyer United States

    E-Print Network [OSTI]

    Standiford, Richard B.

    Rachel Struglia Patricia L. Winter Andrea Meyer United States Department of Agriculture Forest; Winter, Patricia L.; Meyer, Andrea. 2003. Southern California socioeconomic assessment: Sociodemographic Crest Drive, Riverside, CA 92507-6099, e-mail: pwinter@fs.fed.us. Andrea Meyer was, at the time

  18. FMICS 2004 Preliminary Version Modeling fault-tolerant distributed systems for

    E-Print Network [OSTI]

    Girault, Alain

    applications (space, aeronautics, nuclear. . .) as well as public domain applications (automotive, consumer.elsevier.nl/locate/entcs #12;A. Girault and E. Rutten or portable devices), radiation resistance (nuclear or space), or price. The properties enforced concern consistent execution, functionality fulfillment (whatever the faults, under some

  19. FAULT & COORDINATION STUDY FOR T PLANT COMPLEX

    SciTech Connect (OSTI)

    MCDONALD, G.P.; BOYD-BODIAU, E.A.

    2004-09-01T23:59:59.000Z

    A short circuit study is performed to determine the maximum fault current that the system protective devices, transformers, and interconnections would he subject to in event of a three phase, phase-to-phase, or phase-to-ground fault. Generally, the short circuit study provides the worst case fault current levels at each bus or connection point of the system.

  20. Using Fault Model Enforcement to Improve Availability

    E-Print Network [OSTI]

    instead that a new approach, called fault model enforcement, that maps actual faults to expected faults on a constellation of interconnected systems--a typical example is cluster-based systems [4]. Traditional database centers around a set of closely guarded racks and data closets woven together by intricate networks

  1. Using Fault Model Enforcement to Improve Availability

    E-Print Network [OSTI]

    Martin, Richard P.

    that a new approach, called fault model enforcement, that maps actual faults to expected faults on a constellation of interconnected systems--a typical example is cluster-based systems [4]. Traditional database centers around a set of closely guarded racks and data closets woven together by intricate networks

  2. Endorsements and rebuttals in blog distillation q Giacomo Berardi, Andrea Esuli, Fabrizio Sebastiani

    E-Print Network [OSTI]

    Sebastiani, Fabrizio

    Endorsements and rebuttals in blog distillation q Giacomo Berardi, Andrea Esuli, Fabrizio in revised form 10 May 2013 Accepted 30 May 2013 Available online 14 June 2013 Keywords: Blog distillation to blog distillation, defined as the task in which, given a user query, the system ranks the blogs

  3. Expressing Realtime Properties in VSE-II Werner Stephan Andreas Nonnengart Georg Rock

    E-Print Network [OSTI]

    Nonnengart, Andreas

    Expressing Realtime Properties in VSE-II Werner Stephan Andreas Nonnengart Georg Rock German stephan,nonnengart,rock¡ @dfki.de 1 INTRODUCTION It is well known that in many cases severe errors occur system properties. However, specialized description techniques are needed to treat certain aspects

  4. High-resolution stratigraphic and structural characterization of the fault-partitioned Hickory Sandstone aquifer system, Mason County, central Texas

    E-Print Network [OSTI]

    Wilson, Jason Steven

    2001-01-01T23:59:59.000Z

    The Hickory Sandstone is an important aquifer in central Texas and is partitioned by faults that impede cross-fault fluid flow. This study provides a detailed stratigraphic and structural model in the vicinity of a normal, oblique-slip fault...

  5. Signalbehandling til lydsgning Torbjrn Andreas Lisberg

    E-Print Network [OSTI]

    Signalbehandling til lydsgning Torbjrn Andreas Lisberg Kongens Lyngby 2007 IMM-THESIS-2007-36 #12, Danmark Telefon +45 45253351, Fax +45 45882673 reception@imm.dtu.dk www.imm.dtu.dk IMM-THESIS: ISSN 09009 blind separation af kildesignaler fra et enkeltkanals polyfonisk musiksignal, hvor der er specielt fokus

  6. Extremes in climate science Andreas Sterl (KNMI)

    E-Print Network [OSTI]

    Stoffelen, Ad

    (non-deterministic) influences: sun, volcanoes, anthropogenic effects (GHG emissions) => deterministic Sterl, PhysMathClim Climate change GHG concentrations increase => Temperature increases => other weather;31.01.2012, Utrecht Andreas Sterl, PhysMathClim EVT - 1 Extremes: tail of a distribution => few observations => tail

  7. Patent Information Basics Andrea Twiss-Brooks

    E-Print Network [OSTI]

    Ober, Carole

    Patent Information Basics Andrea Twiss-Brooks Bibliographer for Chemistry, Physics, Geophysical Patent Information Basics What are patents? Where do patents come from? Where will I see patent references? How do I find the full text of a patent? Where to go for more information? #12;11/30/2006Page 3

  8. Semantic Knowledge Management for Education Andrea Kohlhase

    E-Print Network [OSTI]

    Kohlhase, Michael

    Semantic Knowledge Management for Education Andrea Kohlhase Dept. of Mathematics and Computer.kohlhase@jacobs-university.de Abstract `Semantic technologies' are touted as the next big wave in Educational Technology notions e.g. of `seman- tics', yielding specific problems in their interplay. In this paper we take a look

  9. Low Cost Arc Fault Detection and Protection for PV Systems: January 30, 2012 - September 30, 2013

    SciTech Connect (OSTI)

    McCalmont, S.

    2013-10-01T23:59:59.000Z

    Final report for Tigo Energy Incubator project. The specific objective of this 18-month research effort was to develop an off-the-shelf arc-fault detector. The starting point of the project was a prototype detector that was constructed using discrete components and laboratory equipment. An intermediate objective was to build a technically viable detector using programmable components in the detector circuitry. The final objective was to build a commercially viable detector by reducing the cost of the circuitry through the use of more sophisticated programmable components and higher levels of integration.

  10. Evaluation of Simple Causal Message Logging for Large-Scale Fault Tolerant HPC Systems

    SciTech Connect (OSTI)

    Bronevetsky, G; Meneses, E; Kale, L V

    2011-02-25T23:59:59.000Z

    The era of petascale computing brought machines with hundreds of thousands of processors. The next generation of exascale supercomputers will make available clusters with millions of processors. In those machines, mean time between failures will range from a few minutes to few tens of minutes, making the crash of a processor the common case, instead of a rarity. Parallel applications running on those large machines will need to simultaneously survive crashes and maintain high productivity. To achieve that, fault tolerance techniques will have to go beyond checkpoint/restart, which requires all processors to roll back in case of a failure. Incorporating some form of message logging will provide a framework where only a subset of processors are rolled back after a crash. In this paper, we discuss why a simple causal message logging protocol seems a promising alternative to provide fault tolerance in large supercomputers. As opposed to pessimistic message logging, it has low latency overhead, especially in collective communication operations. Besides, it saves messages when more than one thread is running per processor. Finally, we demonstrate that a simple causal message logging protocol has a faster recovery and a low performance penalty when compared to checkpoint/restart. Running NAS Parallel Benchmarks (CG, MG and BT) on 1024 processors, simple causal message logging has a latency overhead below 5%.

  11. Alarm Processing with Model-Based Diagnosis of Event Discrete Systems Andreas Bauer, Adi Botea, Alban Grastien, Patrik Haslum, Jussi Rintanen

    E-Print Network [OSTI]

    Grastien, Alban

    more dynamically, to work with wind turbines and other variable-output sources, and to handle overload mod- els of the monitored system. We argue that a deep understanding of the current state of the system be- ing monitored is a prerequisite for more advanced forms of alarm processing. We use a model

  12. AN EARLY WARNING SYSTEM FOR AMBIENT ASSISTED LIVING

    E-Print Network [OSTI]

    Karlsson, Brynjar

    AN EARLY WARNING SYSTEM FOR AMBIENT ASSISTED LIVING June 2012 Andrea Monacchi Master of Science in Computer Science #12;#12;AN EARLY WARNING SYSTEM FOR AMBIENT ASSISTED LIVING Andrea Monacchi Master ISSN 1670-8539 #12;#12;An Early Warning System for Ambient Assisted Living by Andrea Monacchi Project

  13. antoni picard andreas: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    line bundles in the Picard groupoid approach. Stefan Waldmann 2005-09-23 5 Crafting the Mind of PROSOCS Agents Andrea Bracciali Computer Technologies and Information Sciences...

  14. Structure of the eastern Red Rocks and Wind Ridge thrust faults, Wyoming: how a thrust fault gains displacement along strike

    E-Print Network [OSTI]

    Huntsman, Brent Stanley

    1983-01-01T23:59:59.000Z

    OF FIELD MAPPING Methods . Thrust Faults . The Wind Ridge Thrust Fault System The Red Rocks Thrust Fault System CLAY MODEL STUDIES Purpose and Description Model Results DISCUSSION OF RESULTS Kinematics of the Red Rocks Thrust Fault Termination... . Kinematics of the Southern Wind Ridge Thrust Fault . . . A Conceptual Model of the Red Rocks Thrust Fault Termination Implications of the Red Rocks Fault Termination . . . . . . Page V1 V11 1X X1 X11 7 9 17 18 18 21 24 27 35 35 38 49 49...

  15. Development of an Automated Fault Detection and Diagnostic Tool for Unitary HVAC Systems at Industrial Energy Audits

    E-Print Network [OSTI]

    Parikh, Priyam

    2014-10-30T23:59:59.000Z

    on Superheat ......................................................................... 75 Figure 10: Effect of Faults on Compressor Discharge Temperature................................ 76 Figure 11: Effect of Faults on Condenser Split..., and Refrigerant Temperature at Compressor Discharge ..................................... 113 Figure 33: Temperature Sensor to Measure Supply Air Temperature ........................... 114 Figure 34: Mounting of the Pressure Sensor for Evaporator Pressure...

  16. Towards Fault-Tolerant Digital Microfluidic Lab-on-Chip: Defects, Fault Modeling, Testing, and Reconfiguration

    E-Print Network [OSTI]

    Chakrabarty, Krishnendu

    Towards Fault-Tolerant Digital Microfluidic Lab-on-Chip: Defects, Fault Modeling, Testing, NC 27708, USA Abstract Dependability is an important attribute for microfluidic lab-on-chip devices microfluidic lab-on-chip systems. Defects are related to logical fault models that can be viewed not only

  17. Contribution of Identified Active Faults to Near Fault Seismic Hazard in the Flinders Ranges

    E-Print Network [OSTI]

    Sandiford, Mike

    Somerville1 , Peggy Quijada1 , Hong Kie Thio1 , Mike Sandiford2 and Mark Quigley2 1. URS Corporation estimates of fault slip rate from Quigley et al. (2006) to quantify the seismic activity rate on the faults of these models was used in conjunction with the active fault model. Quigley et al. (2006) identified a system

  18. A Quantum Annealing Approach for Fault Detection and Diagnosis of Graph-Based Systems

    E-Print Network [OSTI]

    Alejandro Perdomo-Ortiz; Joseph Fluegemann; Sriram Narasimhan; Rupak Biswas; Vadim N. Smelyanskiy

    2014-10-02T23:59:59.000Z

    Diagnosing the minimal set of faults capable of explaining a set of given observations, e.g., from sensor readouts, is a hard combinatorial optimization problem usually tackled with artificial intelligence techniques. We present the mapping of this combinatorial problem to quadratic unconstrained binary optimization (QUBO), and the experimental results of instances embedded onto a quantum annealing device with 509 quantum bits. Besides being the first time a quantum approach has been proposed for problems in the advanced diagnostics community, to the best of our knowledge this work is also the first research utilizing the route Problem $\\rightarrow$ QUBO $\\rightarrow$ Direct embedding into quantum hardware, where we are able to implement and tackle problem instances with sizes that go beyond previously reported toy-model proof-of-principle quantum annealing implementations; this is a significant leap in the solution of problems via direct-embedding adiabatic quantum optimization. We discuss some of the programmability challenges in the current generation of the quantum device as well as a few possible ways to extend this work to more complex arbitrary network graphs.

  19. Synchronized sampling improves fault location

    SciTech Connect (OSTI)

    Kezunovic, M. [Texas A and M Univ., College Station, TX (United States)] [Texas A and M Univ., College Station, TX (United States); Perunicic, B. [Lamar Univ., Beaumont, TX (United States)] [Lamar Univ., Beaumont, TX (United States)

    1995-04-01T23:59:59.000Z

    Transmission line faults must be located accurately to allow maintenance crews to arrive at the scene and repair the faulted section as soon as possible. Rugged terrain and geographical layout cause some sections of power transmission lines to be difficult to reach. In the past, a variety of fault location algorithms were introduced as either an add-on feature in protective relays or stand-alone implementation in fault locators. In both cases, the measurements of current and voltages were taken at one terminal of a transmission line only. Under such conditions, it may become difficult to determine the fault location accurately, since data from other transmission line ends are required for more precise computations. In the absence of data from the other end, existing algorithms have accuracy problems under several circumstances, such as varying switching and loading conditions, fault infeed from the other end, and random value of fault resistance. Most of the one-end algorithms were based on estimation of voltage and current phasors. The need to estimate phasors introduces additional difficulty in high-speed tripping situations where the algorithms may not be fast enough in determining fault location accurately before the current signals disappear due to the relay operation and breaker opening. This article introduces a unique concept of high-speed fault location that can be implemented either as a simple add-on to the digital fault recorders (DFRs) or as a stand-alone new relaying function. This advanced concept is based on the use of voltage and current samples that are synchronously taken at both ends of a transmission line. This sampling technique can be made readily available in some new DFR designs incorporating receivers for accurate sampling clock synchronization using the satellite Global Positioning System (GPS).

  20. Type-Based Termination of Functional Programs Andreas Abel

    E-Print Network [OSTI]

    Abel, Andreas

    Type-Based Termination of Functional Programs Andreas Abel Department of Computer Science Ludwig Timmendorfer Strand, Germany Andreas Abel (LMU Munich) Type-Based Termination KPS'07 1 / 21 #12;Introduction Termination Question: Will the run of a program eventually halt? Undecidable for Turing-complete programming

  1. Andreas Sterl, Trieste, 17.11.2008 Are observed/modelled ENSO

    E-Print Network [OSTI]

    Haak, Hein

    Andreas Sterl, Trieste, 17.11.2008 Are observed/modelled ENSO teleconnections robust? Andreas Sterl. Dyn., 29, (2007), 469-485, doi: 10.1007/s00382-007-0251-z #12;Andreas Sterl, Trieste, 17 #12;Andreas Sterl, Trieste, 17.11.2008 Example Running correl N34 precip in De Bilt Van Oldenborgh

  2. Power system fault analysis based on intelligent techniques and intelligent electronic device data

    E-Print Network [OSTI]

    Luo, Xu

    2007-09-17T23:59:59.000Z

    techniques including expert systems, fuzzy logic and Petri-nets, as well as data from remote terminal units (RTUs) of supervisory control and data acquisition (SCADA) systems, and digital protective relays have been explored and utilized to fufill...

  3. Study of a Fault Analysis System for a Heat Supply Network Based on GIS

    E-Print Network [OSTI]

    Zou, P.; Liu, M.; Tang, H.; Wang, X.; Li, N.; Wang, W.

    2006-01-01T23:59:59.000Z

    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...

  4. Fault Diagnosis System for a Multilevel Inverter Using a Neural Network Surin Khomfoi Leon M. Tolbert

    E-Print Network [OSTI]

    Tolbert, Leon M.

    such as photovoltaic, wind, and fuel cells can be easily interfaced to the multilevel inverter system for a high power multilevel inverter systems are utilized in high power applications, the reliability of the power electronics introduced remedial control strategies soon after failure occurrences; therefore, system reliability

  5. Fault-Tolerance of Embedded Systems with Automotive Applications Ratnesh Kumar, Dept. of Elec. & Comp. Eng., Iowa State Univ. (ISU)

    E-Print Network [OSTI]

    Rajkumar, Ragunathan "Raj"

    . & Comp. Eng., Iowa State Univ. (ISU) Shengbing Jiang, General Motors R&D and Planning, Warren, MI certain faults, specially those of software, are hard to anticipate in advance. Similarly the simplex

  6. Fault tolerant control of homopolar magnetic bearings and circular sensor arrays

    E-Print Network [OSTI]

    Li, Ming-Hsiu

    2006-04-12T23:59:59.000Z

    Fault tolerant control can accommodate the component faults in a control system such as sensors, actuators, plants, etc. This dissertation presents two fault tolerant control schemes to accommodate the failures of power ...

  7. Fault Detection and Load Distribution for the Wind Farm Challenge

    SciTech Connect (OSTI)

    Borchehrsen, Anders B.; Larsen, Jesper A.; Stoustrup, Jakob

    2014-08-24T23:59:59.000Z

    In this paper a fault detection system and a fault tolerant controller for a wind farm model. The wind farm model used is the one proposed as a public challenge. In the model three types of faults are introduced to a wind farm consisting of nine turbines. A fault detection system designed, by taking advantage of the fact that within a wind farm several wind turbines will be operating under all most identical conditions. The turbines are then grouped, and then turbines within each group are used to generate residuals for turbines in the group. The generated residuals are then evaluated using dynamical cumulative sum. The designed fault detection system is cable of detecting all three fault types occurring in the model. But there is room for improving the fault detection in some areas. To take advantage of the fault detection system a fault tolerant controller for the wind farm has been designed. The fault tolerant controller is a dispatch controller which is estimating the possible power at each individual turbine and then setting the reference accordingly. The fault tolerant controller has been compared to a reference controller. And the comparison shows that the fault tolerant controller performance better in all measures. The fault detection and a fault tolerant controller has been designed, and based on the simulated results the overall performance of the wind farm is improved on all measures. Thereby this is a step towards improving the overall performance of current and future wind farms.

  8. A Methodology and Tool Support for the Design and Evaluation of Fault Tolerant, Distributed Embedded Systems

    E-Print Network [OSTI]

    McKelvin, Jr., Mark Lee

    2011-01-01T23:59:59.000Z

    modern vehicles. The use of electronics in automotive control systemscontrol systems, as described by Yeh [133] and Isermann [46] describes several safety-critical applications in modern

  9. Modeling and Measurement Constraints in Fault Diagnostics for HVAC Systems Massieh Najafi1

    E-Print Network [OSTI]

    . of Statistics, U. of California Berkeley, bartlett@cs.berkeley.edu 4 Leader, Commercial Building Systems Group of five to fifteen percent are achievable in commercial buildings by detecting and correcting building;1. Introduction A commercial building's various energy systems creep from their original design goals

  10. Using Java for Real-Time Critical Industrial Robot Programming Andreas Schierl, Andreas Angerer, Alwin Hoffmann, Michael Vistein and Wolfgang Reif

    E-Print Network [OSTI]

    Reif, Wolfgang

    Using Java for Real-Time Critical Industrial Robot Programming Andreas Schierl, Andreas Angerer, Alwin Hoffmann, Michael Vistein and Wolfgang Reif I. VISION Industrial robotics is characterized programming languages. Additionally, to become an acceptable replacement in industrial applications

  11. Optimized Fault Location Final Project Report

    E-Print Network [OSTI]

    Engineering Research Center Optimized Fault Location Concurrent Technologies Corporation Final Project Report by the Concurrent Technologies Corporation (CTC) and the Power Systems Engineering Research Center (PSERC). NeitherOptimized Fault Location Final Project Report Power Systems Engineering Research Center A National

  12. Fault-tolerant battery system employing intra-battery network architecture

    DOE Patents [OSTI]

    Hagen, Ronald A. (Stillwater, MN); Chen, Kenneth W. (Fair Oaks, CA); Comte, Christophe (Montreal, CA); Knudson, Orlin B. (Vadnais Heights, MN); Rouillard, Jean (Saint-Luc, CA)

    2000-01-01T23:59:59.000Z

    A distributed energy storing system employing a communications network is disclosed. A distributed battery system includes a number of energy storing modules, each of which includes a processor and communications interface. In a network mode of operation, a battery computer communicates with each of the module processors over an intra-battery network and cooperates with individual module processors to coordinate module monitoring and control operations. The battery computer monitors a number of battery and module conditions, including the potential and current state of the battery and individual modules, and the conditions of the battery's thermal management system. An over-discharge protection system, equalization adjustment system, and communications system are also controlled by the battery computer. The battery computer logs and reports various status data on battery level conditions which may be reported to a separate system platform computer. A module transitions to a stand-alone mode of operation if the module detects an absence of communication connectivity with the battery computer. A module which operates in a stand-alone mode performs various monitoring and control functions locally within the module to ensure safe and continued operation.

  13. PRODIAG: Combined expert system/neural network for process fault diagnosis. Volume 1, Theory

    SciTech Connect (OSTI)

    Reifman, J.; Wei, T.Y.C.; Vitela, J.E.

    1995-09-01T23:59:59.000Z

    The function of the PRODIAG code is to diagnose on-line the root cause of a thermal-hydraulic (T-H) system transient with trace back to the identification of the malfunctioning component using the T-H instrumentation signals exclusively. The code methodology is based on the Al techniques of automated reasoning/expert systems (ES) and artificial neural networks (ANN). The research and development objective is to develop a generic code methodology which would be plant- and T-H-system-independent. For the ES part the only plant or T-H system specific code requirements would be implemented through input only and at that only through a Piping and Instrumentation Diagram (PID) database. For the ANN part the only plant or T-H system specific code requirements would be through the ANN training data for normal component characteristics and the same PID database information. PRODIAG would, therefore, be generic and portable from T-H system to T-H system and from plant to plant without requiring any code-related modifications except for the PID database and the ANN training with the normal component characteristics. This would give PRODIAG the generic feature which numerical simulation plant codes such as TRAC or RELAP5 have. As the code is applied to different plants and different T-H systems, only the connectivity information, the operating conditions and the normal component characteristics are changed, and the changes are made entirely through input. Verification and validation of PRODIAG would, be T-H system independent and would be performed only ``once``.

  14. Fault-Aware Application Scheduling in Low-Power Embedded Systems with Energy Harvesting

    E-Print Network [OSTI]

    Pasricha, Sudeep

    computations without relying on an external power supply or frequent battery charges. As the most widely particle strikes, and capacitive and inductive crosstalk [12]. For low-power embedded systems that scale

  15. Development of a methodology to discriminate incipient insulator faults from distribution system load

    E-Print Network [OSTI]

    Richards, Christopher Scott

    2000-01-01T23:59:59.000Z

    Insulator failure has long plagued transmission and distribution system power quality. The failure process begins when airborne contamination combines with moisture from atmospheric wetting to form a conductive pollution layer on the insulator...

  16. Fault Isolation for Spacecraft Systems: An Application to a Power Distribution

    E-Print Network [OSTI]

    Koutsoukos, Xenofon D.

    ]. The EPS supplies power to spacecraft systems and pay- loads. The EPS schematic in Figure 1 shows a battery connected to a load bank through a set of switches, cir- cuit breakers and an inverter. Since the dynamics

  17. Upgrade of the ICRF fault and control systems on alcator C-mod

    E-Print Network [OSTI]

    Wukitch, Stephen James

    The Ion Cyclotron RF Transmitter System (ICRF) at Alcator C-Mod comprises four separate transmitters each capable of driving 2 MW of power into plasma loads. Four separate transmission lines guide RF power into three ...

  18. Microphysical Controls on the Strength and Transport Properties of Fault Zones

    E-Print Network [OSTI]

    French, Melodie Ellen Lynds

    2014-10-07T23:59:59.000Z

    (Chester and Higgs , 1992; Reches and Lockner , 2010; Reinen et al., 1994; Kohli et al., 2011). Clay-rich fault gouge is both weak and velocity-strengthening at sub-seismic rates, leading to the assumption that it is stable (Byerlee, 1978; Logan... of the San Andreas Fault, Journal of Geophysical Research: Solid Earth, 119, 17771802, doi:10.1002/2013JB010757. Copyright 2014 by the American Geophysical Union. 3 et al., 2010). At seismic velocities, however, experimental studies show that clay- bearing...

  19. Diverse neural net solutions to a fault diagnosis problem \\Lambda

    E-Print Network [OSTI]

    Sharkey, Amanda

    Abstract The development of a neural net system for fault diagnosis in a mar­ ine diesel engine system solution to a problem of fault diagnosis in a four­stroke marine diesel engine; that of early to recognise faults in simulated data from a diesel engine; specifically to classify combustion condition

  20. ANALYTICAL REDUNDANCY FOR SYSTEMS WITH UNKNOWN INPUTS -APPLICATION TO FAULTS DETECTION

    E-Print Network [OSTI]

    Boyer, Edmond

    -00144067,version1-29Mar2014 Author manuscript, published in "Control Theory and Advanced Technology 9, 3 the inconsistency between the actual plant variables and the mathematical model. They are computed from the plant observations and with the model of this plant ; they are ideally zero but become non-zero if the actual system

  1. A Reliable Fault-Tolerant Scheduling Algorithm for Real Time Embedded Systems

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    /EWICS Workshop on Dependable Embedded and Cyber-physical Systems) of the 32nd International Conference on Computer Safety, Reliability and Security, Toulouse : France (2013)" #12;2 Chafik Arar, Hamoudi Kalla, Salim Kalla, and Hocine Riadh Scheduling algorithm architecture specification distribution constraints

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

    E-Print Network [OSTI]

    thresholds are exceeded. The paper presents results from testing the controller with a dual-duct air-handling unit. INTRODUCTION Heating, ventilating, and air-conditioning (HVAC) systems are typically controlled energy consumption, and increased wear on controlled elements, such as actuators, valves, and dampers

  3. Fault tree construction of hybrid system requirements using qualitative formal method

    E-Print Network [OSTI]

    Institute, 150, Duckjin-dong, Yuseong-gu, Daejeon 305-353, South Korea b Computer Science Division, EECS Department and Advanced Information Technology Research Center (AITrc), Korea Advanced Institute of Science specifying requirements for software controlling hybrid systems and conducting safety analysis, engineers

  4. FAULT DETECTION IN HVAC SYSTEMS USING MODEL-BASED FEEDFORWARD CONTROL

    E-Print Network [OSTI]

    Diamond, Richard

    building, greater energy consumption, and increased wear on controlled elements, such as actuators, valves Laboratory 507 E Michigan Street 1 Cyclotron Road Milwaukee, WI 53201, USA Berkeley, California 94720, USA, Comfort/Energy, Control/Simulation/Field Tests, Air-Conditioning Systems, Feedforward Control, Diagnostics

  5. Simulation and Validation of Vapor Compression System Faults and Start-up/Shut-down Transients

    E-Print Network [OSTI]

    Ayyagari, Balakrishna

    2012-10-19T23:59:59.000Z

    The statistics from the US Department of Energy show that about one-third of the total consumption of electricity in the households and industries is due to the Air Conditioning and Refrigeration (AC & R) systems. This wide usage has prompted many...

  6. Geospatial Data Integration with Linked Data and Provenance Andreas Harth

    E-Print Network [OSTI]

    Gil, Yolanda

    Geospatial Data Integration with Linked Data and Provenance Tracking Andreas Harth Karlsruhe report on our experiences with integrating geospatial datasets using Linked Data technologies. We describe NeoGeo, an integration vocabulary, and an integration scenario involving two geospatial datasets

  7. Plasticity of Dendritic Excitability Andreas Frick,* Daniel Johnstony

    E-Print Network [OSTI]

    Johnston, Daniel

    Plasticity of Dendritic Excitability Andreas Frick,* Daniel Johnstony Baylor College of Medicine function display plasticity under diverse circumstances such as neuromo- dulation, adaptation, learning115, 2005 Keywords: intrinsic plasticity; synaptic plasticity; long- term potentiation (LTP); dendrite

  8. Study of a Fault Analysis System for a Heat Supply Network Based on GIS

    E-Print Network [OSTI]

    Zou, P.; Liu, M.; Tang, H.; Wang, X.; Li, N.; Wang, W.

    2006-01-01T23:59:59.000Z

    of heat supply network while city heat supply network?s operation time becomes longer and the heat consumer?s number becomes larger. Furthermore, it?s rather difficult to know the pipeline situation, for the complex laying structure, the ceaseless... changing of overground buildings and underground pineline. It?s typical for china?s city pipe network that the data are lack and the layouts of pipeline are complex. Because of these, it is difficult to operate and manage the heating system. Especially...

  9. A hybrid system for fault detection and sensor fusion based on fuzzy clustering and artificial immune systems

    E-Print Network [OSTI]

    Jaradat, Mohammad Abdel Kareem Rasheed

    2007-04-25T23:59:59.000Z

    system (AIS). The proposed hybrid system approach consists of three main phases. In the first phase signal separation is performed using the Fuzzy C-Means (FCM) algorithm. Subsequently a single (fused) signal based on the information provided from...

  10. Superior model for fault tolerance computation in designing nano-sized circuit systems

    SciTech Connect (OSTI)

    Singh, N. S. S., E-mail: narinderjit@petronas.com.my; Muthuvalu, M. S., E-mail: msmuthuvalu@gmail.com [Fundamental and Applied Sciences Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Perak (Malaysia); Asirvadam, V. S., E-mail: vijanth-sagayan@petronas.com.my [Electrical and Electronics Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Perak (Malaysia)

    2014-10-24T23:59:59.000Z

    As CMOS technology scales nano-metrically, reliability turns out to be a decisive subject in the design methodology of nano-sized circuit systems. As a result, several computational approaches have been developed to compute and evaluate reliability of desired nano-electronic circuits. The process of computing reliability becomes very troublesome and time consuming as the computational complexity build ups with the desired circuit size. Therefore, being able to measure reliability instantly and superiorly is fast becoming necessary in designing modern logic integrated circuits. For this purpose, the paper firstly looks into the development of an automated reliability evaluation tool based on the generalization of Probabilistic Gate Model (PGM) and Boolean Difference-based Error Calculator (BDEC) models. The Matlab-based tool allows users to significantly speed-up the task of reliability analysis for very large number of nano-electronic circuits. Secondly, by using the developed automated tool, the paper explores into a comparative study involving reliability computation and evaluation by PGM and, BDEC models for different implementations of same functionality circuits. Based on the reliability analysis, BDEC gives exact and transparent reliability measures, but as the complexity of the same functionality circuits with respect to gate error increases, reliability measure by BDEC tends to be lower than the reliability measure by PGM. The lesser reliability measure by BDEC is well explained in this paper using distribution of different signal input patterns overtime for same functionality circuits. Simulation results conclude that the reliability measure by BDEC depends not only on faulty gates but it also depends on circuit topology, probability of input signals being one or zero and also probability of error on signal lines.

  11. Photovoltaic ground fault and blind spot electrical simulations.

    SciTech Connect (OSTI)

    Flicker, Jack David; Johnson, Jay

    2013-06-01T23:59:59.000Z

    Ground faults in photovoltaic (PV) systems pose a fire and shock hazard. To mitigate these risks, AC-isolated, DC grounded PV systems in the United States use Ground Fault Protection Devices (GFPDs), e.g., fuses, to de-energize the PV system when there is a ground fault. Recently the effectiveness of these protection devices has come under question because multiple fires have started when ground faults went undetected. In order to understand the limitations of fuse-based ground fault protection in PV systems, analytical and numerical simulations of different ground faults were performed. The numerical simulations were conducted with Simulation Program with Integrated Circuit Emphasis (SPICE) using a circuit model of the PV system which included the modules, wiring, switchgear, grounded or ungrounded components, and the inverter. The derivation of the SPICE model and the results of parametric fault current studies are provided with varying array topologies, fuse sizes, and fault impedances. Closed-form analytical approximations for GFPD currents from faults to the grounded current carrying conductor-known as %E2%80%9Cblind spot%E2%80%9D ground faults-are derived to provide greater understanding of the influence of array impedances on fault currents. The behavior of the array during various ground faults is studied for a range of ground fault fuse sizes to determine if reducing the size of the fuse improves ground fault detection sensitivity. The results of the simulations show that reducing the amperage rating of the protective fuse does increase fault current detection sensitivity without increasing the likelihood of nuisance trips to a degree. Unfortunately, this benefit reaches a limit as fuses become smaller and their internal resistance increases to the point of becoming a major element in the fault current circuit.

  12. RIS-M-2311 AUTOMATIC FAULT TREE CONSTRUCTION WITH RIKKE

    E-Print Network [OSTI]

    RIS-M-2311 AUTOMATIC FAULT TREE CONSTRUCTION WITH RIKKE A COMPENDIUM OF EXAMPLES, VOLUME I BASIC MODELS J.R. Taylor Abstract. Examples of automatically constructed fault trees are given. In this first are intended to illustrate the prin- ciples of fault tree construction using the RIKKE failure analysis system

  13. 5A.8 IDENTIFYING NONSTATIONARITY IN THE ATMOSPHERIC SURFACE LAYER Edgar L Andreas*1

    E-Print Network [OSTI]

    Geiger, Cathleen

    1 of 12 5A.8 IDENTIFYING NONSTATIONARITY IN THE ATMOSPHERIC SURFACE LAYER Edgar L Andreas*1 address: Edgar L Andreas, U.S. Army Cold Regions Research and Engineering Laboratory, 72 Lyme Road

  14. To provide high dependability in a multithreaded system despite hardware faults, the system must detect and cor-

    E-Print Network [OSTI]

    Balasubramonian, Rajeev

    , the system must detect and cor- rect errors in its shared memory system. Recent research has explored dynamic the commodity computing market. Second, the industrial roadmap [7] and recent research [17] fore- cast increases susceptible to having their charges dis- rupted by alpha particles or cosmic radiation [21]. Many researchers

  15. IEEE TRANSACTIONS ON POWER ELECTRONICS 1 A Fault-Tolerant Switching Scheme for an Isolated

    E-Print Network [OSTI]

    Mazumder, Sudip K.

    a model- reference adaptive system-based fault diagnosis algorithm for a VSI used as a PMSM drive system

  16. Evaluation of a Decoupling-Based Fault Detection and Diagnostic Technique - Part II: Field Evaluation and Application

    E-Print Network [OSTI]

    Li, H.; Braun, J.

    2006-01-01T23:59:59.000Z

    Existing methods addressing automated fault detection and diagnosis (FDD) for vapor compression air conditioning system have good performance for faults that occur individually, but they have difficulty in handling multiple-simultaneous faults...

  17. Bisectional fault detection system

    DOE Patents [OSTI]

    Archer, Charles Jens (Rochester, MN); Pinnow, Kurt Walter (Rochester, MN); Ratterman, Joseph D. (Rochester, MN); Smith, Brian Edward (Rochester, MN)

    2012-02-14T23:59:59.000Z

    An apparatus, program product and method logically divide a group of nodes and causes node pairs comprising a node from each section to communicate. Results from the communications may be analyzed to determine performance characteristics, such as bandwidth and proper connectivity.

  18. East-west faults due to planetary contraction

    E-Print Network [OSTI]

    Beuthe, Mikael

    2010-01-01T23:59:59.000Z

    Contraction, expansion and despinning have been common in the past evolution of Solar System bodies. These processes deform the lithosphere until it breaks along faults. The type and orientation of faults are usually determined under the assumption of a constant lithospheric thickness, but lithospheric thinning can occur at the equator or at the poles due either to latitudinal variation in solar insolation or to localized tidal dissipation. Using thin elastic shells with variable thickness, I show that the equatorial thinning of the lithosphere transforms the homogeneous and isotropic fault pattern caused by contraction/expansion into a pattern of faults striking east-west, preferably formed in the equatorial region. By contrast, lithospheric thickness variations only weakly affect the despinning faulting pattern consisting of equatorial strike-slip faults and polar normal faults. If contraction is added to despinning, the despinning pattern first shifts to thrust faults striking north-south and then to thrus...

  19. PL-MODT and PL-MODMC : two codes for reliability and availability analysis of complex technical systems using the fault tree modularization technique

    E-Print Network [OSTI]

    Modarres, M. (Mohammad)

    1978-01-01T23:59:59.000Z

    The methodology used in the PL-MOD code has been extended to include the time-dependent behavior of the fault tree components. Four classes of components are defined to model time-dependent fault tree leaves. Mathematical ...

  20. Colorado Regional Faults

    SciTech Connect (OSTI)

    Hussein, Khalid

    2012-02-01T23:59:59.000Z

    Citation Information: Originator: Earth Science &Observation Center (ESOC), CIRES, University of Colorado at Boulder Originator: Colorado Geological Survey (CGS) Publication Date: 2012 Title: Regional Faults Edition: First Publication Information: Publication Place: Earth Science & Observation Center, Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder Publisher: Earth Science &Observation Center (ESOC), CIRES, University of Colorado at Boulder Description: This layer contains the regional faults of Colorado Spatial Domain: Extent: Top: 4543192.100000 m Left: 144385.020000 m Right: 754585.020000 m Bottom: 4094592.100000 m Contact Information: Contact Organization: Earth Science &Observation Center (ESOC), CIRES, University of Colorado at Boulder Contact Person: Khalid Hussein Address: CIRES, Ekeley Building Earth Science & Observation Center (ESOC) 216 UCB City: Boulder State: CO Postal Code: 80309-0216 Country: USA Contact Telephone: 303-492-6782 Spatial Reference Information: Coordinate System: Universal Transverse Mercator (UTM) WGS1984 Zone 13N False Easting: 500000.00000000 False Northing: 0.00000000 Central Meridian: -105.00000000 Scale Factor: 0.99960000 Latitude of Origin: 0.00000000 Linear Unit: Meter Datum: World Geodetic System 1984 (WGS 984) Prime Meridian: Greenwich Angular Unit: Degree Digital Form: Format Name: Shape file

  1. Fault tolerant pulse synchronization

    E-Print Network [OSTI]

    Deconda, Keerthi

    2009-05-15T23:59:59.000Z

    FFC n=4 orig alg n=4 ft alg n=7 orig alg n=7 ft alg n=10 orig alg n=10 ft alg 24 (a) n=4, f=1. (b) n=7, f=2. Fig. 5: Convergence Time with No Jump faults. 0 50 100 150 200 250 70 100 250 500 Tim e to co nv erg e FFC orig alg: no faults... orig alg: NoJump faults ft alg:NoJump faults 0 50 100 150 200 250 300 350 400 450 70 100 250 500 Tim e to co nv erg e FFC orig alg: no faults orig alg: NoJump faults ft alg:NoJump faults 25 (c) n=10, f=3. Fig. 5 (Continued) Fig. 5(a...

  2. Fault-tolerant Sensor Network based on Fault Evaluation Matrix and Compensation for Intermittent Observation

    E-Print Network [OSTI]

    Fault-tolerant Sensor Network based on Fault Evaluation Matrix and Compensation for Intermittent-tolerant sensor network configuration problem for a target navigation. A sensor network system consists of many sensor nodes and its network connections. Each sensor node can exchange information by wireless

  3. Power spectrum estimates of high frequency noise generated by high impedance arcing faults on distribution systems / by Thomas James Talley

    E-Print Network [OSTI]

    Talley, Thomas James

    1979-01-01T23:59:59.000Z

    faults, and to search for possible solutions, Pennsylvania Power and Light Company (PP&L) gathered data on instances of downed conductors. [ 4 ] In a breakdown of 390 cases of downed conductors on 12 KV overhead distribution lines in 1974...-75, they found that over- current protective devices did not operate for 23%%d of the cases where the feeder had bare wire conductors, and 727. of the cases where the feeder had XLP covered conductors. These figures indicate the severity of the problem...

  4. Coordinated Fault Tolerance for High-Performance Computing

    SciTech Connect (OSTI)

    Dongarra, Jack; Bosilca, George; et al.

    2013-04-08T23:59:59.000Z

    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 stackfrom the application, math libraries, and programming language runtime to other common system software such as jobs schedulers, resource managers, and monitoring tools.

  5. Similarity Matching Techniques for Fault Diagnosis in Automotive Infotainment Electronics

    E-Print Network [OSTI]

    Kabir, Mashud

    2009-01-01T23:59:59.000Z

    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...

  6. Fault-tolerant distributed transactions for partitioned OLTP databases

    E-Print Network [OSTI]

    Jones, Evan P. C. (Evan Philip Charles), 1981-

    2012-01-01T23:59:59.000Z

    This thesis presents Dtxn, a fault-tolerant distributed transaction system designed specifically for building online transaction processing (OLTP) databases. Databases have traditionally been designed as general purpose ...

  7. Checksum-Based Fault Tolerance for LU Factorization

    E-Print Network [OSTI]

    Davies, Teresa

    2014-01-01T23:59:59.000Z

    study of failures in high-performance computing systems. InFault tolerant high performance computing by a codingfor large-scale high- performance computing. In 2012

  8. PV Arc Fault Detector Challenges Due to Module Frequency Response...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    This poster does not contain any proprietary or confidential information. Introduction PV system arc faults have led to a number of rooftop fires which have caused significant...

  9. Effects of Volcanism, Crustal Thickness, and Large Scale Faulting...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    of Volcanism, Crustal Thickness, and Large Scale Faulting on the Development and Evolution of Geothermal Systems: Collaborative Project in Chile Effects of Volcanism, Crustal...

  10. Automated transmission line fault analysis using synchronized sampling at two ends

    SciTech Connect (OSTI)

    Kezunovic, M. [Texas A and M Univ., College Station, TX (United States)] [Texas A and M Univ., College Station, TX (United States); Perunicic, B. [Lamar Univ., Beaumont, TX (United States)] [Lamar Univ., Beaumont, TX (United States)

    1996-02-01T23:59:59.000Z

    This paper introduces a new approach to fault analysis using synchronized sampling. A digital fault recorder with Global Positioning System (GPS) satellite receiver is the source of data for this approach. Fault analysis functions, such as fault detection, classification and location are implemented for a transmission line using synchronized samples from two ends of a line. This technique can be extremely fast, selective and accurate, providing fault analysis performance that can not easily be matched by other known techniques.

  11. Automated transmission line fault analysis using synchronized sampling at two ends

    SciTech Connect (OSTI)

    Kezunovic, M. [Texas A and M Univ., College Station, TX (United States); Perunicic, B. [Lamar Univ., Beaumont, TX (United States)

    1995-12-31T23:59:59.000Z

    This paper introduces a new approach to fault analysis using synchronized sampling. A digital fault recorder with Global Positioning System (GPS) satellite receiver is the source of data for this approach. Fault analysis functions, such as fault detection, classification and location are implemented for a transmission line using synchronized samples from two ends of a line. This technique can be extremely fast, selective and accurate, providing fault analysis performance that can not easily be matched by other known techniques.

  12. Fault simulation and test generation for small delay faults

    E-Print Network [OSTI]

    Qiu, Wangqi

    2007-04-25T23:59:59.000Z

    Delay faults are an increasingly important test challenge. Traditional delay fault models are incomplete in that they model only a subset of delay defect behaviors. To solve this problem, a more realistic delay fault model has been developed which...

  13. Designing Virtual Organizations for Citizen Science Andrea Wiggins

    E-Print Network [OSTI]

    Crowston, Kevin

    Designing Virtual Organizations for Citizen Science Andrea Wiggins Syracuse University Syracuse, NY projects. Citizen science is a phenomenon with this potential; the term refers to research projects involv 2001, Cohn 2008, Bonney & LaBranche 2004). Citizen science is related to long-standing programs

  14. Technology and Work Practices in Citizen Science Andrea Wiggins

    E-Print Network [OSTI]

    Crowston, Kevin

    Technology and Work Practices in Citizen Science Andrea Wiggins Syracuse University School of Information Studies 337 Hinds Hall, Syracuse, NY 13244 USA awiggins@syr.edu ABSTRACT Citizen science is a form of cyberinfrastructure for citizen science. Comparing three projects with similar volunteer participation activities

  15. antibody negative systemic: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    related issues. Andreas Blass; Yuri Gurevich 2015-02-02 57 The performance of foundation systems on unsaturated soil de-posits is considerably influenced by variations of...

  16. Fault Detection, Identification and Accommodation for an Electro-hydraulic

    E-Print Network [OSTI]

    Yao, Bin

    Fault Detection, Identification and Accommodation for an Electro-hydraulic System: An Adaptive in electro-hydraulic systems. It is well known fact that any realistic model of a hydraulic system suffers, such a scheme becomes a natural choice for designing robust fault detection algorithms for electro-hydraulic

  17. FAULT DETECTION AND STATE EVALUATION OF ROTOR BLADES Yuri Petryna, Andreas Knzel, Matthias Kannenberg

    E-Print Network [OSTI]

    Boyer, Edmond

    . INTRODUCTION Wind turbines are usually exposed to intensive dynamic loading for 20 to 30 years of design lifetime. A rapid development of new machines, carrying structures and foundation types in the offshore monitoring. There exist almost no commercially available and reliable solutions for offshore structures

  18. Frictional Strength of the Creeping Segment of the San Andreas Fault

    E-Print Network [OSTI]

    Coble, Clayton Gage

    2012-02-14T23:59:59.000Z

    G ouge SG-2 2 100 100 25 Brine SHS 0.6 4.25 11 Table 1 continued. Gouge Type Exp. # w (m m ) T (C ) ? ne (MPa) P p (MPa) Pore Fl ui d T es t Type Shear displ. ra te... ( ?m /s) d (m m ) SAFOD Gouge SG-4 2 100 100 25 Brine SHS 0.006 3.90 SAFOD Gouge SG-6 2 100 100 25 Brine VS 0.6, 0.06, 0.006 4.25 SAFOD Gouge SG-7 2 100, 80, 120 100 25 Brine...

  19. Spatiotemporal evolution of a transient slip event on the San Andreas fault near Parkfield, California

    E-Print Network [OSTI]

    Segall, Paul

    data [e.g., Gladwin et al., 1994; Linde et al., 1996; Johnston and Linde, 2002]. These aseismic slip

  20. Mesoscale fracture fabric and paleostress along the San Andreas fault at SAFOD

    E-Print Network [OSTI]

    Almeida, Rafael Vladimir

    2009-05-15T23:59:59.000Z

    ) exhumation related to uplift of the regional Coast Ranges during the late Cenozoic [Blythe et al., 2004]. These data indicate that in spite of having a lateral transport of 160 km over the last 5 Myr [e.g. Sims, 1993], only 1 km of net vertical motion... occurred during the last 60 Myr [Blythe et al., 2004]. In contrast to the Salinian block, the block on the northeast side of the SAF is complexly deformed. The northeastern block is composed of the Franciscan Complex, overlain by the Great Valley...

  1. Automatic Fault Characterization via Abnormality-Enhanced Classification

    SciTech Connect (OSTI)

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

    2010-12-20T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

    Gregg, Patricia Michelle Marie

    2008-01-01T23:59:59.000Z

    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 ...

  3. Fault-tolerant Partial-resonant High-frequency AC-link Converters and Their Applications

    E-Print Network [OSTI]

    Keyhani, Hamidreza

    2014-01-08T23:59:59.000Z

    concerns in addition to voltage and current scalabilities. Moreover, fault tolerance of power converters is becoming more and more essential in many applications, such as aerospace and subsea systems. Fault tolerance involves the detection...

  4. Triassic/Jurassic faulting patterns of Conecuh Ridge, southwest Alabama

    SciTech Connect (OSTI)

    Hutley, J.K.

    1985-02-01T23:59:59.000Z

    Two major fault systems influenced Jurassic structure and deposition on the Conecuh Ridge, southwest Alabama. Identification and dating of these fault systems are based on seismic-stratigraphic interpretation of a 7-township grid in Monroe and Conecuh Counties. Relative time of faulting is determined by fault geometry and by formation isopachs and isochrons. Smackover and Norphlet Formations, both Late Jurassic in age, are mappable seismic reflectors and are thus reliable for seismicstratigraphic dating. The earlier of the 2 fault systems is a series of horsts and grabens that trends northeast-southwest and is Late Triassic to Early Jurassic in age. The system formed in response to tensional stress associated with the opening of the Atlantic Ocean. The resulting topography was a series of northeast-southwest-trending ridges. Upper Triassic Eagle Mills and Jurassic Werner Formations were deposited in the grabens. The later fault system is also a series of horsts and grabens trending perpendicular to the first. This system was caused by tensional stress related to a pulse in the opening of the Gulf of Mexico. Faulting began in Early Jurassic and continued into Late Jurassic, becoming progressively younger basinward. At the basin margin, faulting produced a very irregular shoreline. Submerged horst blocks became centers for shoaling or carbonate buildups. Today, these blocks are exploration targets in southwest Alabama.

  5. IWR Im Neuenheimer Feld 368 69120 Heidelberg Universitt Heidelberg www.iwr.uni-heidelberg.de Andreas Sommer 4. April 2012

    E-Print Network [OSTI]

    Heermann, Dieter W.

    .iwr.uni-heidelberg.de Andreas Sommer 4. April 2012 Angewandte Mathematik in Unser Star fr Baku Das Heidelberg Chapter of SIAM ber 70 geworden!" freuen sich Drte Beigel und Andreas Sommer als lokale Organisatoren. Ihre

  6. J1.15 PARAMETERIZING THE TURBULENT SURFACE FLUXES OVER SUMMER SEA ICE Edgar L Andreas1*

    E-Print Network [OSTI]

    Persson, Ola

    1 of 9 J1.15 PARAMETERIZING THE TURBULENT SURFACE FLUXES OVER SUMMER SEA ICE Edgar L Andreas1* , P- * Corresponding author address: Edgar L Andreas, U.S. Army Cold Regions Research and Engineering Laboratory, 72

  7. 4.2 RAPID FORCING OF THE SURFACE AND NEAR-SURFACE ATMOSPHERE Edgar L Andreas*1

    E-Print Network [OSTI]

    Geiger, Cathleen

    1 of 12 4.2 RAPID FORCING OF THE SURFACE AND NEAR-SURFACE ATMOSPHERE Edgar L Andreas*1 , Cathleen A quite fast--1 Hz for most instruments and 10 Hz for six * Corresponding author address: Edgar L Andreas

  8. Fault Locating, Prediction and Protection (FLPPS)

    SciTech Connect (OSTI)

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

    2010-09-30T23:59:59.000Z

    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

  9. Fuzzy Pattern Recognition Based Fault Diagnosis Rafik Bensaadi1

    E-Print Network [OSTI]

    Boyer, Edmond

    Fuzzy Pattern Recognition Based Fault Diagnosis Rafik Bensaadi1 , Leïla H. Mouss1 , Mohamed D in this paper the design of a Fuzzy Pattern Recognition System (FPRS) that solves, in real time, the main. Keywords: Diagnosis, fault detection, pattern recognition, fuzzy control, conjugate gradients, complex

  10. Symbolic identification for fault detection in aircraft gas turbine engines

    E-Print Network [OSTI]

    Ray, Asok

    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

  11. Different Limit to the Body's Ability of Increasing Fat-Free Mass Geltrude Mingrone, Simeone Marino, Andrea DeGaetano, Esmeralda Capristo, Steven B. Heymsfield,

    E-Print Network [OSTI]

    Kirschner, Denise

    , Andrea DeGaetano, Esmeralda Capristo, Steven B. Heymsfield, Giovanni Gasbarrini, and Aldo V. Greco

  12. Investigation of the Meers fault in southwestern Oklahoma

    SciTech Connect (OSTI)

    Luza, K.V.; Madole, R.F.; Crone, A.J.

    1987-08-01T23:59:59.000Z

    The Meers fault is part of a major system of NW-trending faults that form the boundary between the Wichita Mountains and the Anadarko basin in southwestern Oklahoma. A portion of the Meers fault is exposed at the surface in northern Comanche County and strikes approximately N. 60/sup 0/ W. where it offsets Permian conglomerate and shale for at least 26 km. The scarp on the fault is consistently down to the south, with a maximum relief of 5 m near the center of the fault trace. Quaternary stratigraphic relationships and 10 /sup 14/C age dates constrain the age of the last movement of the Meers fault. The last movement postdates the Browns Creek Alluvium, late Pleistocene to early Holocene, and predates the East Cache Alluvium, 100 to 800 yr B.P. Fan alluvium, produced by the last fault movement, buried a soil that dates between 1400 and 1100 yr B.P. Two trenches excavated across the scarp near Canyon Creek document the near-surface deformation and provide some general information on recurrence. Trench 1 was excavated in the lower Holocene part of the Browns Creek Alluvium, and trench 2 was excavated in unnamed gravels thought to be upper Pleistocene. Flexing and warping was the dominant mode of deformation that produced the scarp. The stratigraphy in both trenches indicates one surface-faulting event, which implies a lengthy recurrence interval for surface faulting on this part of the fault. Organic-rich material from two samples that postdate the last fault movement yielded /sup 14/C ages between 1600 and 1300 yr B.P. These dates are in excellent agreement with the dates obtained from soils buried by the fault-related fan alluvium.

  13. What about vulnerability to a fault attack of the Miller algorithm during an

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    What about vulnerability to a fault attack of the Miller algorithm during an Identity Based is to analyse the weakness of the Miller algorithm when it undergoes a fault attack. We prove that the Miller algorithm is vulnerable to a fault attack which is valid in all coordinate systems, through the resolution

  14. What About Vulnerability to a Fault Attack of the Miller's Algorithm During an

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    What About Vulnerability to a Fault Attack of the Miller's Algorithm During an Identity Based of this article is to analyse the weakness of the Miller's algorithm when it undergoes a fault attack. We prove that the Miller's algorithm is vulnerable to a fault attack which is valid in all coordinate systems, through

  15. Voltage grid support of DFIG wind turbines during grid faults Anca D. Hansen1

    E-Print Network [OSTI]

    Voltage grid support of DFIG wind turbines during grid faults Anca D. Hansen1 , Gabriele Michalke2 Abstract The fault ride-through and grid support capabilities of the doubly fed induction generator (DFIG and their contribution to support the grid, i.e. to the voltage control in the power system, during grid faults

  16. Arcing fault in sub-distribution branch circuits

    SciTech Connect (OSTI)

    Parise, G.; Grasseli, U.; Luozzo, V. Di (Univ. di Roma, Rome (Italy). Dept. di Ingegneria Elettrica)

    1993-04-01T23:59:59.000Z

    It's well known the importance of short-circuit current evaluation for the design of any power system. Every system is subject to faults, moreover short-circuits and ground faults can be expected in any point. Even if the maximum and minimum values are generally defined with reference at a bolted-fault, bolted short-circuits are rare and the fault usually involves arcing and burning; particularly the limit value of minimum short-circuit depends really on arcing-fault. In earlier experimental investigations into the functional simulation of insulation loss, in branch circuit conductors, the authors chose to normalize the arcing-fault simulation to be used in laboratory tests. This conventional simulation allows characterization of this intrinsically random phenomenon by means of a probabilistic approach, in order to define in statistical terms the expected short circuit value. The authors examine more closely the arcing-fault in the design of sub distribution branch-circuits as weak points of the installation. In fact, what they propose are straightforward criteria, whether in the structure of the system or in the coordination of protection, which afford a more rational control on arcing-fault.

  17. Fault Controlled | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand JumpConceptual Model,DOEHazelPennsylvania: EnergyExolisFairway,FarmersFastcap SystemsShear Zone:Fault

  18. Method of detecting the direction of arcing faults on power distribution feeders

    E-Print Network [OSTI]

    Fernando, W. Anand Krisantha

    1992-01-01T23:59:59.000Z

    lines served by the same substation, resulting in false indications on the other feeders, in the case of an arcing fault. Two primary methods of detecting directionality of power system faults exist, impedance relaying and traveling wave relaying... is of significant magnitude to cause a current reversal in the case of a reverse fault [18]. 2. Traveling Wave Relaying The need for more accurate and fast detection of fault and direction of very high voltage transmission lines, was the base of invention...

  19. Transition-fault test generation

    E-Print Network [OSTI]

    Cobb, Bradley Douglas

    2013-02-22T23:59:59.000Z

    . One way to detect these timing defects is to apply test patterns to the integrated circuit that are generated using the transition-fault model. Unfortunately, industry's current transition-fault test generation schemes produce test sets that are too...

  20. Implementation and Testing of a Fault Detection Software Tool for Improving Control System Performance in a Large Commercial Building

    E-Print Network [OSTI]

    on a dual-duct air-handling unit installed in a large office building in San Francisco. We demonstrate related to implementation. Introduction Heating, ventilating, and air-conditioning (HVAC) systems in the treated building, greater energy consumption, and increased wear on controlled elements, such as actuators

  1. Spectrum-based Fault Diagnosis for Service-Oriented Software Systems Cuiting Chen, Hans-Gerhard Gross and Andy Zaidman

    E-Print Network [OSTI]

    Zaidman, Andy

    -Gerhard Gross and Andy Zaidman Delft University of Technology, the Netherlands Email: {cuiting assurance approaches useless. In order to enable service systems to recover from and adapt to runtime of the traditional (offline) quality assurance methods useless [3]. In particular, many failures only emerge during

  2. Fault tolerant linear actuator

    DOE Patents [OSTI]

    Tesar, Delbert

    2004-09-14T23:59:59.000Z

    In varying embodiments, the fault tolerant linear actuator of the present invention is a new and improved linear actuator with fault tolerance and positional control that may incorporate velocity summing, force summing, or a combination of the two. In one embodiment, the invention offers a velocity summing arrangement with a differential gear between two prime movers driving a cage, which then drives a linear spindle screw transmission. Other embodiments feature two prime movers driving separate linear spindle screw transmissions, one internal and one external, in a totally concentric and compact integrated module.

  3. Computer hardware fault administration

    DOE Patents [OSTI]

    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

    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.

  4. Fault-tolerant quantum computation by anyons

    E-Print Network [OSTI]

    A. Yu. Kitaev

    1997-07-09T23:59:59.000Z

    A two-dimensional quantum system with anyonic excitations can be considered as a quantum computer. Unitary transformations can be performed by moving the excitations around each other. Measurements can be performed by joining excitations in pairs and observing the result of fusion. Such computation is fault-tolerant by its physical nature.

  5. Undulator Hall Air Temperature Fault Scenarios

    SciTech Connect (OSTI)

    Sevilla, J.; Welch, J.; /SLAC; ,

    2010-11-17T23:59:59.000Z

    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.

  6. Fault Current Calculation by The Least Squares Method Natthaphob Nimpitiwan, Student Member, IEEE, and Gerald T. Heydt, Fellow, IEEE

    E-Print Network [OSTI]

    OF FAULT CURRENT Circuit breaker capability and configuration of protective relays that were previously relays, and their coordination. Systems must be able to withstand a certain limit of faults which also

  7. Melt generation, crystallization, and extraction beneath segmented oceanic transform faults

    E-Print Network [OSTI]

    Gregg, Patricia M.

    We examine mantle melting, fractional crystallization, and melt extraction beneath fast slipping, segmented oceanic transform fault systems. Three-dimensional mantle flow and thermal structures are calculated using a ...

  8. assembly line fault: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    of fault data to verify that all elements of the protection system Siegel, Mel 190 Bucket brigades on in-tree assembly networks John J. Bartholdi III a,*, Donald D. Eisenstein...

  9. analysis fault reactivation: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    23 24 25 Next Page Last Page Topic Index 81 System level Analysis of Fault Effect in an Automotive Environment CiteSeer Summary: In the last years, new requirements in terms of...

  10. IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS, VOL. 19, NO. 8, AUGUST 2011 1357 A Time-Aware Fault Tolerance Scheme to Improve

    E-Print Network [OSTI]

    Zhang, Tong

    effect makes the resistance of phase-change material drift over the time, which can severely degrade A Time-Aware Fault Tolerance Scheme to Improve Reliability of Multilevel Phase-Change Memory--Because of its promising scalability potential and support of multilevel per cell storage, phase-change memory

  11. Area balance and strain in an extensional fault system: Strategies for improved oil recovery in fractured chalk, Gilbertown Field, southwestern Alabama. Final report, March 1996--September 1998

    SciTech Connect (OSTI)

    Pashin, J.C.; Raymond, D.E.; Rindsberg, A.K.; Alabi, G.G.; Carroll, R.E.; Groshong, R.H.; Jin, G.

    1998-12-01T23:59:59.000Z

    This project was designed to analyze the structure of Mesozoic and Tertiary strata in Gilbertown Field and adjacent areas to suggest ways in which oil recovery can be improved. The Eutaw Formation comprises 7 major flow units and is dominated by low-resistivity, low-contrast play that is difficult to characterize quantitatively. Selma chalk produces strictly from fault-related fractures that were mineralized as warm fluid migrated from deep sources. Resistivity, dipmeter, and fracture identification logs corroborate that deformation is concentrated in the hanging-wall drag zones. New area balancing techniques were developed to characterize growth strata and confirm that strain is concentrated in hanging-wall drag zones. Curvature analysis indicates that the faults contain numerous fault bends that influence fracture distribution. Eutaw oil is produced strictly from footwall uplifts, whereas Selma oil is produced from fault-related fractures. Clay smear and mineralization may be significant trapping mechanisms in the Eutaw Formation. The critical seal for Selma reservoirs, by contrast, is where Tertiary clay in the hanging wall is juxtaposed with poorly fractured Selma chalk in the footwall. Gilbertown Field can be revitalized by infill drilling and recompletion of existing wells. Directional drilling may be a viable technique for recovering untapped oil from Selma chalk. Revitalization is now underway, and the first new production wells since 1985 are being drilled in the western part of the field.

  12. Proc. of Pacific Asian Conference on Expert Systems, pp.322-329, 1997 A Model-based Diagnosis with Fault Event Models

    E-Print Network [OSTI]

    Mizoguchi, Riichiro

    -heater, "corrosion" causes the existence of some fragments in the steam. Next, the fragments move into the turbine chain of a fault in a super-heater and a turbine shown in Figure 1. First, in the super and collide with the turbine blade, which results in "breakage" of the blade. Eventually, the revolution

  13. Development of Characterization Technology for Fault Zone Hydrology

    SciTech Connect (OSTI)

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

    2010-08-06T23:59:59.000Z

    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.

  14. Neural net application to transmission line fault detection and classification

    E-Print Network [OSTI]

    Rikalo, Igor

    1994-01-01T23:59:59.000Z

    . So far, several NN implementations for various fault diagnosis problems have been reported in the literature. A number of papers describing NN applications in pov er systems categorized in appropriate groups can be found in [19, 20]. 1. 3. Thesis... important issue for stable and reliable operation of pov;er systems. The main target of the fault analysis are circuit breaker and protection relay operations. The task of the analysis is to reach a conclusion about the current state of the electrical...

  15. The application of satellite time references to HVDC fault location

    SciTech Connect (OSTI)

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

    1993-07-01T23:59:59.000Z

    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.

  16. Fault-tolerant, Universal Adiabatic Quantum Computation

    E-Print Network [OSTI]

    Ari Mizel

    2014-03-30T23:59:59.000Z

    Quantum computation has revolutionary potential for speeding computational tasks such as factoring and simulating quantum systems, but the task of constructing a quantum computer is daunting. Adiabatic quantum computation and other ``hands-off" approaches relieve the need for rapid, precise pulsing to control the system, inspiring at least one high-profile effort to realize a hands-off quantum computing device. But is hands-off incompatible with fault-tolerant? Concerted effort and many innovative ideas have not resolved this question but have instead deepened it, linking it to fundamental problems in quantum complexity theory. Here we present a hands-off approach that is provably (a) capable of scalable universal quantum computation in a non-degenerate ground state and (b) fault-tolerant against an analogue of the usual local stochastic fault model. A satisfying physical and numerical argument indicates that (c) it is also fault-tolerant against thermal excitation below a threshold temperature independent of the computation size.

  17. Temperature Collocation Algorithm for Fast and Robust Distillation Libin Zhang and Andreas A. Linninger*

    E-Print Network [OSTI]

    Linninger, Andreas A.

    Temperature Collocation Algorithm for Fast and Robust Distillation Design Libin Zhang and Andreas A mixtures that exhibit suitable volatility differences.1 Hence, continuous distillation columns, along commodity manufacturing. The common practice for distillation design often involves numerous trial

  18. Towards More Flexible Schema Management in Object Bases Guido Moerkotte Andreas Zachmann

    E-Print Network [OSTI]

    Mannheim, Universität

    Towards More Flexible Schema Management in Object Bases Guido Moerkotte Andreas Zachmann Universit¨at Karlsruhe Fakult¨at f¨ur Informatik D­7500 Karlsruhe West Germany Netmail: moer/zachmann@ira.uka.de Abstract

  19. Technology and Work Practices in Citizen Science Andrea Wiggins Syracuse University awiggins@syr.edu

    E-Print Network [OSTI]

    Crowston, Kevin

    Technology and Work Practices in Citizen Science Andrea Wiggins Syracuse University awiggins Citizen science is a form of collaboration involving public participation in scientific research Processes Organizing Research Participation Environment Virtuality Technology Outcomes Science Social

  20. Increased oxidative stress in barn swallows from the Chernobyl region Andrea Bonisoli-Alquati a,

    E-Print Network [OSTI]

    Mousseau, Timothy A.

    Increased oxidative stress in barn swallows from the Chernobyl region Andrea Bonisoli-Alquati a Available online 5 November 2009 Keywords: Antioxidant capacity Barn swallow Chernobyl Oxidative stress Radioactive contamination Reactive oxygen species The Chernobyl nuclear accident produced the largest

  1. BOX: Browsing Objects in XML Christian Nentwich, Wolfgang Emmerich, Anthony Finkelstein and Andrea Zisman

    E-Print Network [OSTI]

    Finkelstein, Anthony

    BOX: Browsing Objects in XML Christian Nentwich, Wolfgang Emmerich, Anthony Finkelstein and Andrea|W.Emmerich|A.Finkelstein|A.Zismang@cs.ucl.ac.uk Abstract The latest Internet markup languages

  2. Action-Related Place-Based Mobile Manipulation Freek Stulp, Andreas Fedrizzi, Michael Beetz

    E-Print Network [OSTI]

    Cremers, Daniel

    Action-Related Place-Based Mobile Manipulation Freek Stulp, Andreas Fedrizzi, Michael Beetz, Germany {stulp,fedrizzi,beetz}@cs.tum.edu Abstract-- In mobile manipulation, the position to which

  3. Microsoft Word - GroundFaultSAND-rev7-JJ.doc

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    to describe analytically without transcendental equations, but the use of computer circuit simulations can describe the behavior of a PV system for a wide variety of fault...

  4. Stress and fault rock controls on fault zone hydrology, Coso...

    Open Energy Info (EERE)

    rock controls on fault zone hydrology, Coso geothermal field, CA Abstract In crystalline rock of the Coso Geothermal Field, CA, fractures are the primary source of permeability....

  5. Fault-tree construction and calculations on a microcomputer

    E-Print Network [OSTI]

    Beckmann, Jeffery Linn

    1985-01-01T23:59:59.000Z

    Figure 17 - Program Overview Screen Figure 18 ? Main Menu Screen Figure 19 ? Invalid Command Screen Figure 20 - First Usage of Disk Screen Figure 21 ? Fault-tree Name Screen Figure 22 - Invalid Fault-tree Name Screen Fi gure 23 ? TOP EVENT Label... to do? Fi gure 19. Inval i d Command Screen 53 CREATE - This command allows the user to build a new fault tree. After a CREATE command is entered, the system wi 1 1 display the screen in Figure 20. This question is asked in order to determine...

  6. Fault-tree construction and calculations on a microcomputer

    E-Print Network [OSTI]

    Beckmann, Jeffery Linn

    1985-01-01T23:59:59.000Z

    Figure 17 - Program Overview Screen Figure 18 ? Main Menu Screen Figure 19 ? Invalid Command Screen Figure 20 - First Usage of Disk Screen Figure 21 ? Fault-tree Name Screen Figure 22 - Invalid Fault-tree Name Screen Fi gure 23 ? TOP EVENT Label... to do? Fi gure 19. Inval i d Command Screen 53 CREATE - This command allows the user to build a new fault tree. After a CREATE command is entered, the system wi 1 1 display the screen in Figure 20. This question is asked in order to determine...

  7. Completing fault models for abductive diagnosis

    SciTech Connect (OSTI)

    Knill, E. (Los Alamos National Lab., NM (United States)); Cox, P.T.; Pietrzykowski, T. (Technical Univ., NS (Canada))

    1992-11-05T23:59:59.000Z

    In logic-based diagnosis, the consistency-based method is used to determine the possible sets of faulty devices. If the fault models of the devices are incomplete or nondeterministic, then this method does not necessarily yield abductive explanations of system behavior. Such explanations give additional information about faulty behavior and can be used for prediction. Unfortunately, system descriptions for the consistency-based method are often not suitable for abductive diagnosis. Methods for completing the fault models for abductive diagnosis have been suggested informally by Poole and by Cox et al. Here we formalize these methods by introducing a standard form for system descriptions. The properties of these methods are determined in relation to consistency-based diagnosis and compared to other ideas for integrating consistency-based and abductive diagnosis.

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

    SciTech Connect (OSTI)

    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

    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.

  9. Research on Fault Analysis and Fault-Tolerant Control of EV/HEV Powertrain

    E-Print Network [OSTI]

    Brest, Universit de

    power industries, interests in diagnostics and fault-tolerant control of nuclear power plants have been industrial systems. To achieve these goals, monitoring and supervision are embedded in the electrical energy, FTC has been implemented in sensible applications such as aerospace, nuclear power, automotive

  10. Performance Study of Enhanced Auto-Associative Neural Networks For Sensor Fault Detection

    E-Print Network [OSTI]

    Najafi, M.; Culp, C.; Langari, R.

    2004-01-01T23:59:59.000Z

    - INTRODUCTION When sensors malfunction, control systems become unreliable. Even with the most sophisticated instruments and control algorithms, a control decision based on faulty data will likely lead to incorrect control actions. ?Sensor Fault Detection...? is usually considered as a subset of fault detection. One of the well known approaches in Fault Detection is the model based approach in which a computational model is designed to predict the real system output while receiving the same input ([7], [8...

  11. Occupancy Based Fault Detection on Building Level - a Feasibility Study

    E-Print Network [OSTI]

    Tuip, B.; Houten, M.; Trcka, M.; Hensen, M.

    2010-01-01T23:59:59.000Z

    -going commissioning and fault detection and diagnostics (FDD) has been performed to improve the current situation of building problems by comparing measured building performance with design predictions [Portland 2003]. For fault detection, different methods... conference on building commissioning, Portland Energy Conservation. Portland. 2003. Methods for automated and continuous commissioning of building systems. US department of commerce, Portland energy conservation inc. Schijndel, A.W.M. van, 2008...

  12. 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

  13. Fault current limiter

    DOE Patents [OSTI]

    Darmann, Francis Anthony

    2013-10-08T23:59:59.000Z

    A fault current limiter (FCL) includes a series of high permeability posts for collectively define a core for the FCL. A DC coil, for the purposes of saturating a portion of the high permeability posts, surrounds the complete structure outside of an enclosure in the form of a vessel. The vessel contains a dielectric insulation medium. AC coils, for transporting AC current, are wound on insulating formers and electrically interconnected to each other in a manner such that the senses of the magnetic field produced by each AC coil in the corresponding high permeability core are opposing. There are insulation barriers between phases to improve dielectric withstand properties of the dielectric medium.

  14. Fault Current Limiters

    Broader source: Energy.gov (indexed) [DOE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645 3,625 1,006 492 742Energy Chinaof EnergyImpactOnSTATEMENT OF DAVID GEISEREnergy1DNVDOE'sUAfter 12Fault

  15. Nonpathological Lyapunov functions and discontinuous Caratheodory systems

    E-Print Network [OSTI]

    Bacciotti, Andrea

    Nonpathological Lyapunov functions and discontinuous Carath´eodory systems Andrea Bacciotti both Lyapunov stability and asymptotic stability in terms of nonsmooth Lyapunov functions are given. An invariance principle is also proven. Key words: Lyapunov functions, stability, stabilizability, discontinuous

  16. Preferred orientation of phyllosilicates: Comparison of fault gouge, shale and schist

    SciTech Connect (OSTI)

    Wenk, Hans-Rudolf; Kanitpanyacharoen, Waruntorn; Voltolini, Marco (UCB)

    2010-08-04T23:59:59.000Z

    Samples of fault gouge from the San Andreas Fault drill hole (SAFOD), a shale from the North Sea sedimentary basin and schists from metamorphic rocks in the Alps have been analyzed with high energy synchrotron X-rays to determine preferred orientation of mica and clay minerals. The method relies on obtaining 2D diffraction images which are then processed with the crystallographic Rietveld method, implemented in the software MAUD, allowing for deconvolution of phases and extraction of their orientation distributions. It is possible to distinguish between detrital illite/muscovite and authigenic illite/smectite, kaolinite and chlorite, and muscovite and biotite, with strongly overlapping peaks in the diffraction pattern. The results demonstrate that phyllosilicates show large texture variations in various environments, where different mechanisms produce the rock microfabrics: fault gouge fabrics are quite weak and asymmetric with maxima for (001) in the range of 1.5-2.5 multiples of random distribution (m.r.d.). This is attributed to heterogeneous deformation with randomization, as well as dissolution-precipitation reactions. Shale fabrics have maxima ranging from 3 to 9 m.r.d. and this is due to sedimentation and compaction. The strongest fabrics were observed in metamorphic schists (10-14 m.r.d.) and developed by deformation as well as recrystallization in a stress field. In the analyzed samples, fabrics of co-existing quartz are weak. All phyllosilicate textures can be explained by orientation of (001) platelets, with no additional constraints on a-axes.

  17. Position Paper for NSF-NIST-USCAR Workshop on Cyber-Physical Systems Fault Diagnosis and Prognosis in a Network of Embedded Systems in Automotive Vehicles

    E-Print Network [OSTI]

    Rajkumar, Ragunathan "Raj"

    in a Network of Embedded Systems in Automotive Vehicles K. Pattipati1, C. Sankavaram1, B. Wang2, P. Zhang1, Y Identification The relentless competition among automotive companies and increased demands from customers poor vehicle performance increases maintenance costs to customers and warranty costs to automotive

  18. Microcomputer applications of, and modifications to, the modular fault trees

    SciTech Connect (OSTI)

    Zimmerman, T.L.; Graves, N.L.; Payne, A.C. Jr.; Whitehead, D.W. [Sandia National Labs., Albuquerque, NM (United States)] [Sandia National Labs., Albuquerque, NM (United States)

    1994-10-01T23:59:59.000Z

    The LaSalle Probabilistic Risk Assessment was the first major application of the modular logic fault trees after the IREP program. In the process of performing the analysis, many errors were discovered in the fault tree modules that led to difficulties in combining the modules to form the final system fault trees. These errors are corrected in the revised modules listed in this report. In addition, the application of the modules in terms of editing them and forming them into the system fault trees was inefficient. Originally, the editing had to be done line by line and no error checking was performed by the computer. This led to many typos and other logic errors in the construction of the modular fault tree files. Two programs were written to help alleviate this problem: (1) MODEDIT - This program allows an operator to retrieve a file for editing, edit the file for the plant specific application, perform some general error checking while the file is being modified, and store the file for later use, and (2) INDEX - This program checks that the modules that are supposed to form one fault tree all link up appropriately before the files are,loaded onto the mainframe computer. Lastly, the modules were not designed for relay type logic common in BWR designs but for solid state type logic. Some additional modules were defined for modeling relay logic, and an explanation and example of their use are included in this report.

  19. Coordinated Fault-Tolerance for High-Performance Computing Final Project Report

    SciTech Connect (OSTI)

    Panda, Dhabaleswar Kumar [The Ohio State University; Beckman, Pete

    2011-07-01T23:59:59.000Z

    With the Coordinated Infrastructure for Fault Tolerance Systems (CIFTS, as the original project came to be called) project, our aim has been to understand and tackle the following broad research questions, the answers to which will help the HEC community analyze and shape the direction of research in the field of fault tolerance and resiliency on future high-end leadership systems. #15; Will availability of global fault information, obtained by fault information exchange between the different HEC software on a system, allow individual system software to better detect, diagnose, and adaptively respond to faults? If fault-awareness is raised throughout the system through fault information exchange, is it possible to get all system software working together to provide a more comprehensive end-to-end fault management on the system? #15; What are the missing fault-tolerance features that widely used HEC system software lacks today that would inhibit such software from taking advantage of systemwide global fault information? #15; What are the practical limitations of a systemwide approach for end-to-end fault management based on fault awareness and coordination? #15; What mechanisms, tools, and technologies are needed to bring about fault awareness and coordination of responses on a leadership-class system? #15; What standards, outreach, and community interaction are needed for adoption of the concept of fault awareness and coordination for fault management on future systems? Keeping our overall objectives in mind, the CIFTS team has taken a parallel fourfold approach. #15; Our central goal was to design and implement a light-weight, scalable infrastructure with a simple, standardized interface to allow communication of fault-related information through the system and facilitate coordinated responses. This work led to the development of the Fault Tolerance Backplane (FTB) publish-subscribe API specification, together with a reference implementation and several experimental implementations on top of existing publish-subscribe tools. #15; We enhanced the intrinsic fault tolerance capabilities representative implementations of a variety of key HPC software subsystems and integrated them with the FTB. Targeting software subsystems included: MPI communication libraries, checkpoint/restart libraries, resource managers and job schedulers, and system monitoring tools. #15; Leveraging the aforementioned infrastructure, as well as developing and utilizing additional tools, we have examined issues associated with expanded, end-to-end fault response from both system and application viewpoints. From the standpoint of system operations, we have investigated log and root cause analysis, anomaly detection and fault prediction, and generalized notification mechanisms. Our applications work has included libraries for fault-tolerance linear algebra, application frameworks for coupled multiphysics applications, and external frameworks to support the monitoring and response for general applications. #15; Our final goal was to engage the high-end computing community to increase awareness of tools and issues around coordinated end-to-end fault management.

  20. Hot Pot Detail - Evidence of Quaternary Faulting

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Lane, Michael

    Compilation of published data, field observations and photo interpretation relevant to Quaternary faulting at Hot Pot.

  1. Hot Pot Detail - Evidence of Quaternary Faulting

    SciTech Connect (OSTI)

    Lane, Michael

    2013-06-27T23:59:59.000Z

    Compilation of published data, field observations and photo interpretation relevant to Quaternary faulting at Hot Pot.

  2. Grain-scale Comminution and Alteration of Arkosic Rocks in the Damage Zone of the San Andreas Fault at SAFOD

    E-Print Network [OSTI]

    Heron, Bretani

    2012-02-14T23:59:59.000Z

    , the particle sizes are consistent with a power law distribution over the particle size range investigated (0.3 m fractal dimension, D) is found to increase with shear strain and volume fraction of laumontite. This overall increase...

  3. Fact or friction: Inferring rheology from nonvolcanic tremor and low-frequency earthquakes on the deep San Andreas fault

    E-Print Network [OSTI]

    Thomas, Amanda

    2012-01-01T23:59:59.000Z

    2.5 Optimal friction coefficient . . . . . . . . . . . . . .effective coefficient of friction. Values for the tremor,procedure on each friction value for each catalogue. Maximum

  4. Fabric Analysis of Survivor Clasts in the Southwest Deforming Zone of the San Andreas Fault at Three Kilometers Depth

    E-Print Network [OSTI]

    Loftin, Aileen

    2014-09-24T23:59:59.000Z

    -frequency and shape-size distributions of survivor clasts from the SDZ were characterized through 3D analysis of X-Ray Computed Tomography (XCT) images of SDZ core samples. A number of processing techniques were employed to calibrate, remove artifacts, filter...

  5. A review of "Women and Islam in Early Modern English Literature" by Bernadette Andrea

    E-Print Network [OSTI]

    Singh, Jyotsna G.

    2010-01-01T23:59:59.000Z

    - tribution to a growing body of scholarship on Europe?s encounter with Muslim cultures in the early modern period. Andrea?s exploration of the ?significance of women?s agency in the inaugural Anglo-Ottoman encounter? from the sixteenth century... frequently represented the Ottomans reviews 7 as positive foils? (4). Clearly at stake in these early Anglo-Ottoman or Anglo-Muslim encounters is the struggle for the power of self-representation; in this climate, English cultural and literary...

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

    E-Print Network [OSTI]

    Neal, Leslie Ann

    2002-01-01T23:59:59.000Z

    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...

  7. Regional fault pattern study - Sonam/Ajapa area offshore Western Niger Delta

    SciTech Connect (OSTI)

    Kanu, K.A.; Glass, J.E.; Okoro, P.C. [Chevron Nigeria Ltd., Lagos (Nigeria)] [and others

    1995-08-01T23:59:59.000Z

    A total of 900 km{sup 2} of high quality 3-D data was used to interpret structural trends: an inner trend containing the Mefa, Meji and Ajapa oil fields and a younger outer trend containing the large Sonam condensate field. Each trend is bounded by a large, regional down-to-the-coast fault system on the northeast and its associated counter-regional fault to the southwest. Hydrocarbon accumulations are contained within rollover anticlines adjacent to the main seaward-dipping fault trends. However, our data shows that structural geometries within each trend are highly three-dimensional. Anticlinal end closure is achieved by changes in fault detachment level and displacement which generally occur near major fault junctions. Thus, significant accumulations are associated with first-order high-relief accommodation zones. In the absence of such first-order closure, we cannot rely upon the systems of relatively small faults that occur on seaward dipping flanks and in areas of crestal collapse. Detailed 3-D mapping, supported by drilling results, shows that such faults do not link strongly together, thereby allowing leakage of hydrocarbons mound fault tips and up relay ramps between faults.

  8. Fault-tolerant rotary actuator

    SciTech Connect (OSTI)

    Tesar, Delbert

    2006-10-17T23:59:59.000Z

    A fault-tolerant actuator module, in a single containment shell, containing two actuator subsystems that are either asymmetrically or symmetrically laid out is provided. Fault tolerance in the actuators of the present invention is achieved by the employment of dual sets of equal resources. Dual resources are integrated into single modules, with each having the external appearance and functionality of a single set of resources.

  9. Development of Characterization Technology for Fault Zone Hydrology

    E-Print Network [OSTI]

    Karasaki, Kenzi

    2010-01-01T23:59:59.000Z

    TECHNOLOGY FOR FAULT ZONE HYDROLOGY Kenzi Karasaki Lawrencefor characterizing the hydrology of fault zones, recognizingstructure of faults to hydrology, that it still may be

  10. active fault diagnosis: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Harrold, Mary Jean 453 Fault Tolerant Control with Additive Compensation for Faults in an Automotive Damper Physics Websites Summary: Fault Tolerant Control with Additive...

  11. Passive fault current limiting device

    DOE Patents [OSTI]

    Evans, Daniel J. (Wheeling, IL); Cha, Yung S. (Darien, IL)

    1999-01-01T23:59:59.000Z

    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.

  12. Passive fault current limiting device

    DOE Patents [OSTI]

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

    1999-04-06T23:59:59.000Z

    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.

  13. Establishment of the mathematical model for diagnosing the engine valve faults by genetic

    E-Print Network [OSTI]

    Fernandez, Thomas

    in a six- cylinders/four-stroke cycle diesel engine, i.e. normal condition, valve-tappet clearance and gas for diagnosing the faults occurring in rotor-bearing system, but current computer programs cannot easily distinguish the orbit shapes automatically. Likewise, when diagnosing the faults in a rolling-element bearing

  14. Fault Detection Methodology for Caches in Reliable Modern VLSI Microprocessors based on Instruction Set

    E-Print Network [OSTI]

    Kouroupetroglou, Georgios

    , Professor #12;hardware defects that may occur during system operation by the increased soft error rateFault Detection Methodology for Caches in Reliable Modern VLSI Microprocessors based on Instruction-Based Self-Test (SBST) fault detection methodology for small embedded cache memories. The methodology

  15. RELIABILITY ANALYSIS IN A FAULT TOLERANT CONTROL STRATEGY DEDICATED TO ACTIVE POWER FILTER

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    RELIABILITY ANALYSIS IN A FAULT TOLERANT CONTROL STRATEGY DEDICATED TO ACTIVE POWER FILTER P. WEBER reliability indicate the optimal structure. Keywords: Fault Tolerant Control, System Reliability, Active power control and nuclear power plant operation (Zhang and Jiang, 2003). Various studies on FTC are based

  16. A Probability Extension of PCA to Detect and Diagnose Sensor Faults in Air Handling Units

    E-Print Network [OSTI]

    Li, Z.

    2011-01-01T23:59:59.000Z

    Due to sensor faults, it is a challenge to successfully detect and diagnose component faults in HVAC systems. The Principal Component Analysis (PCA) method has become a popular method to tackle this problem in recent years, but PCA is not capable...

  17. Fault Evolution in Photovoltaic Array During Night-to-Day Transition

    E-Print Network [OSTI]

    Lehman, Brad

    amount of energy loss. For example, in UK domestic PV systems, the annual energy loss due to faults in PV Fault detection and protection in solar photovoltaic (PV) arrays are important tasks for improving PV at night when there is no solar irradiance. During sunrise, the irradiance on the PV array increases slowly

  18. animal detection system: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Channel Fault Detection and Diagnosis System for a Small Animal APD-Based Digital PET Scanner CERN Preprints Summary: Fault detection and diagnosis is critical to many...

  19. Journal of Systems and Software, Vol. 82(1) pp. 131-143 (January 2009). http://dx.doi.org/10.1016/j.jss.2008.06.036 CoRAL: A Transparent Fault-Tolerant Web Service

    E-Print Network [OSTI]

    Tamir, Yuval

    .jss.2008.06.036 CoRAL: A Transparent Fault-Tolerant Web Service Navid Aghdaie1 and Yuval Tamir * Concurrent is increasingly used for critical applications and services. We present a client-transparent mechanism, called CoRAL, that provides high reliability and availability for Web service. CoRAL provides fault tolerance even

  20. Wireless Technology in Industrial Networks Andreas Willig, Member, IEEE, Kirsten Matheus, Member, IEEE, Adam Wolisz, Senior

    E-Print Network [OSTI]

    Wichmann, Felix

    of existing wireless technologies for this specific field of applications, and iii) the creation of hybrid1 Wireless Technology in Industrial Networks Andreas Willig, Member, IEEE, Kirsten Matheus, Member), pp. 1130-1151 Abstract With the success of wireless technologies in consumer electronics, standard

  1. Hardware Accelerated Point Rendering of Isosurfaces J. Andreas Brentzen Niels Jrgen Christensen

    E-Print Network [OSTI]

    Hardware Accelerated Point Rendering of Isosurfaces J. Andreas Bærentzen Niels Jørgen Christensen techniques, and in- teractive applications require fast generation and rendering of surface primitives technique for point scaling using distance attenuation which makes it possible to render points stored

  2. Shell Model Dynamics of HCl on the MgO(001) Surface Terrace Andreas Markmann,1

    E-Print Network [OSTI]

    Markmann, Andreas

    are then used to aid the analysis of MD calculations. After equilibrium dynamics, a sudden excitation of the OH of molecular dynamics using specially tailored laser fields. The reaction of hydrogen chloride moleculesShell Model Dynamics of HCl on the MgO(001) Surface Terrace Andreas Markmann,1 Jacob L. Gavartin,2

  3. Digital imaging processing for biophysical applications Jrg Schilling, Erich Sackmann, and Andreas R. Bauscha)

    E-Print Network [OSTI]

    Bausch, Andreas

    Digital imaging processing for biophysical applications Jörg Schilling, Erich Sackmann, and Andreas experimental setups rely on digital imaging processing. The introduction of a new generation of digital cameras enables new experiments where time dependent processes can be detected with a high time resolution

  4. The SALSA Annotation Tool Katrin Erk and Andrea Kowalski and Sebastian Pad

    E-Print Network [OSTI]

    Pad, Sebastian

    The SALSA Annotation Tool Katrin Erk and Andrea Kowalski and Sebastian Pad Department of Computational Linguistics Saarland University 66123 Saarbrcken erk,kowalski,pado@coli.uni-sb.de Abstract (Erk et al., 2003). 2 Design Input and output. The SALSA tool reads syn- tactically annotated corpora

  5. Lo studio della politica -o potrebbe essere -scientifico? Prof. Andrea Mignone

    E-Print Network [OSTI]

    Genova, Universit degli Studi di

    1 Lo studio della politica - o potrebbe essere - scientifico? Prof. Andrea Mignone Laudatio per Politica presso l'Universit di Harvard. Ha ricoperto e ricopre numerosi e prestigiosi incarichi presso, teso alla ricerca dei rapporti (principi e metodi comuni) tra scienza economica e scienza politica

  6. MOTION CONTROL OF AN OMNIDIRECTIONAL MOBILE ROBOT Xiang Li, Andreas Zell

    E-Print Network [OSTI]

    Zell, Andreas

    MOTION CONTROL OF AN OMNIDIRECTIONAL MOBILE ROBOT Xiang Li, Andreas Zell Wilhelm-Schickard-Institute, Departmant of Computer Architecture, University of T¨ubingen, Sand 1, 72076 T¨ubingen, Germany xiang, actuator saturation, path following control. Abstract: This paper focuses on the motion control problem

  7. Surveying the Citizen Science Landscape by Andrea Wiggins & Kevin Crowston1

    E-Print Network [OSTI]

    Crowston, Kevin

    1 Surveying the Citizen Science Landscape by Andrea Wiggins & Kevin Crowston1 Abstract Citizen of the diversity of the field as a whole. In this work, we present the results of a survey of citizen science between citizen science projects and to other online communities. Contents Introduction Rubric & Cases

  8. Design and applications of a beer mat for pub interaction Andreas Butz

    E-Print Network [OSTI]

    Design and applications of a beer mat for pub interaction Andreas Butz Media Informatics University the design of an interactive beer mat for the support of entertainment activities in pubs. The mat uses. We show how the instrumentation of an everyday object (if a beer mat can be considered this) opens

  9. Robust Multi-Person Tracking from Moving Platforms Andreas Ess1

    E-Print Network [OSTI]

    Schindler, Konrad

    Robust Multi-Person Tracking from Moving Platforms Andreas Ess1 , Konrad Schindler1 , Bastian Leibe://drops.dagstuhl.de/opus/volltexte/2008/1617 #12;2 A. Ess, K. Schindler, B. Leibe, L. van Gool the proposed integration is the concept

  10. Realcoded Genetic Optimization of Fuzzy Clustering Konstantinos Blekas and Andreas Stafylopatis

    E-Print Network [OSTI]

    Blekas, Konstantinos

    the fuzzy c­means algorithm in terms of the correct placement of patterns into partitions. 1 INTRODUCTION The task of pattern classification and recognition typically constitutes a major componentReal­coded Genetic Optimization of Fuzzy Clustering Konstantinos Blekas and Andreas Stafylopatis

  11. Real-coded Genetic Optimization of Fuzzy Clustering Konstantinos Blekas and Andreas Stafylopatis

    E-Print Network [OSTI]

    Blekas, Konstantinos

    the fuzzy c-means algorithm in terms of the correct placement of patterns into partitions. 1 INTRODUCTION The task of pattern classi cation and recognition typically constitutes a major component of an intelligentReal-coded Genetic Optimization of Fuzzy Clustering Konstantinos Blekas and Andreas Stafylopatis

  12. Interacting FisherWright Diffusions in a Catalytic Medium Andreas Greven

    E-Print Network [OSTI]

    Klenke, Achim

    environment (catalytic medium). Here we introduce a model of interacting Fisher­Wright diffusions where environment, catalytic medium, longtime behaviour, rescaling. AMS Subject Classification: 60K35, 60J70Interacting Fisher­Wright Diffusions in a Catalytic Medium Andreas Greven Mathematisches Institut

  13. Dynamic Fusion of Web Data Erhard Rahm, Andreas Thor, David Aumueller

    E-Print Network [OSTI]

    Schler, Axel

    Dynamic Fusion of Web Data Erhard Rahm, Andreas Thor, David Aumueller University of Leipzig integrate data and services from multiple web sources. Such integration workflows can build on existing services for web search, entity search, database querying, and information extraction and thus complement

  14. Plant-Wide Waste Management. 1. Synthesis and Multiobjective Aninda Chakraborty and Andreas A. Linninger*

    E-Print Network [OSTI]

    Linninger, Andreas A.

    cleanup and waste treatment efforts often compound actual process overhead unaccounted-specific selection criteria. It is customary to remove hazardous solid wastes via incineration, while wastewaterPlant-Wide Waste Management. 1. Synthesis and Multiobjective Design Aninda Chakraborty and Andreas

  15. Incremental Development for Automotive Software in AutoMoDe Andreas Bauer1

    E-Print Network [OSTI]

    Braun, Peter

    Incremental Development for Automotive Software in AutoMoDe Andreas Bauer1 Jan Romberg1 Bernhard Validas AG 3 ETAS GmbH 4 PMSF IT Consulting 5 Robert Bosch GmbH Abstract Automotive software development. To facilitate the design and evolution of heterogeneous automotive software, suitable views for each level

  16. 12 PLANET EARTH Summer 2014 Earthquake progression with time along the North Anatolian Fault. The current sequence started with the 1939 earthquake and has progressed westwards towards Istanbul.

    E-Print Network [OSTI]

    Brierley, Andrew

    that to the amount of energy being stored on the fault. Finally, the modelling team will link these observations12 PLANET EARTH Summer 2014 Earthquake progression with time along the North Anatolian Fault in the world: the North Anatolian Fault. This is a system of large fractures within the Earth on which energy

  17. Influence of Transcontinental arch on Cretaceous listric-normal faulting, west flank, Denver basin

    SciTech Connect (OSTI)

    Davis, T.L.

    1983-08-01T23:59:59.000Z

    Seismic studies along the west flank of the Denver basin near Boulder and Greeley, Colorado illustrate the interrelationship between shallow listric-normal faulting in the Cretaceous and deeper basement-controlled faulting. Deeper fault systems, primarily associated with the Transcontinental arch, control the styles and causative mechanisms of listric-normal faulting that developed in the Cretaceous. Three major stratigraphic levels of listric-normal faulting occur in the Boulder-Greeley area. These tectonic sensitive intervals are present in the following Cretaceous formations: Laramie-Fox Hills-upper Pierre, middle Pierre Hygiene zone, and the Niobrara-Carlile-Greenhorn. Documentation of the listric-normal fault style reveals a Wattenberg high, a horst block or positive feature of the greater Transcontinental arch, was active in the east Boulder-Greeley area during Cretaceous time. Paleotectonic events associated with the Wattenberg high are traced through analysis of the listric-normal fault systems that occur in the area. These styles are important to recognize because of their stratigraphic and structural influence on Cretaceous petroleum reservoir systems in the Denver basin. Similar styles of listric-normal faulting occur in the Cretaceous in many Rocky Mountain foreland basins.

  18. A Rectilinear-Monotone Polygonal Fault Block Model for Fault-Tolerant Minimal Routing

    E-Print Network [OSTI]

    Wang, Dajin

    ]. In rectangular model, all faulty nodes are grouped in dis- jointed, rectangular areas, called fault blocksA Rectilinear-Monotone Polygonal Fault Block Model for Fault-Tolerant Minimal Routing in Mesh Dajin Wang, Member, IEEE Abstract--We propose a new fault block model, Minimal-Connected-Component (MCC

  19. Robust Multi-Person Tracking from a Mobile Andreas Ess, Bastian Leibe, Konrad Schindler, and Luc van Gool

    E-Print Network [OSTI]

    Schindler, Konrad

    1 Robust Multi-Person Tracking from a Mobile Platform Andreas Ess, Bastian Leibe, Konrad Schindler the combination of and careful interplay between A. Ess is with the Computer Vision Laboratory at ETH Zurich

  20. Impact of Installation Faults on Heat Pump Performance

    SciTech Connect (OSTI)

    Hourahan, Mr. Glenn [Air Conditioning Contractors of America, Arlington, VA; Baxter, Van D [ORNL

    2015-01-01T23:59:59.000Z

    Numerous studies and surveys indicate that typically-installed HVAC equipment operate inefficiently and waste considerable energy due to varied installation errors (faults) such as improper refrigerant charge, incorrect airflow, oversized equipment, and leaky ducts. This article summarizes the results of a large United States (U.S.) experimental/analytical study (U.S. contribution to IEA HPP Annex 36) of the impact that different faults have on the performance of an air-source heat pump (ASHP) in a typical U.S. single-family house. It combines building effects, equipment effects, and climate effects in an evaluation of the faults impact on seasonal energy consumption through simulations of the house/ASHP pump system.

  1. Occupancy Based Fault Detection on Building Level - a Feasibility Study

    E-Print Network [OSTI]

    Tuip, B.; Houten, M.; Trcka, M.; Hensen, M.

    2010-01-01T23:59:59.000Z

    Occupancy based fault detection on building level ? a feasibility study B.G.C.C. Tuip BSc. dr.ir. M.A. v. Houten dr. Dipl.-Ing. M. Trcka prof.dr.ir. J.L.M. Hensen Unit Building Performance and Systems Eindhoven University of Technology...

  2. Test Case Purification for Improving Fault Localization Jifeng Xuan

    E-Print Network [OSTI]

    Test Case Purification for Improving Fault Localization Jifeng Xuan INRIA Lille - Nord Europe Lille on the execution trace of test cases. Failing test cases and their assertions form test oracles for the failing behavior of the system under analysis. In this paper, we propose a novel concept of spectrum driven test

  3. A Tool for Efficient Fault Tree Analysis (extended version)

    E-Print Network [OSTI]

    Vellekoop, Michel

    , medical equipment, and power grids are dependable. Also, risk management is often required by law. Fault like system reliability and availability. This paper presents DFTCalc, a powerful tool for FTA the underlying state space small. 1 Introduction Risk analysis is a key feature in reliability engineering

  4. Adaptive Fault Tolerance in Real Time Cloud Computing Sheheryar Malik

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    Adaptive Fault Tolerance in Real Time Cloud Computing Sheheryar Malik Research Team OASIS INRIA.huet@inria.fr Abstract -- With the increasing demand and benefits of cloud computing infrastructure, real time computing can be performed on cloud infrastructure. A real time system can take advantage of intensive computing

  5. High temperature superconducting fault current limiter

    DOE Patents [OSTI]

    Hull, J.R.

    1997-02-04T23:59:59.000Z

    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.

  6. High temperature superconducting fault current limiter

    DOE Patents [OSTI]

    Hull, John R. (Hinsdale, IL)

    1997-01-01T23:59:59.000Z

    A fault current limiter (10) for an electrical circuit (14). The fault current limiter (10) includes a high temperature superconductor (12) in the electrical circuit (14). The high temperature superconductor (12) is cooled below its critical temperature to maintain the superconducting electrical properties during operation as the fault current limiter (10).

  7. Software Fault Diagnosis Peter Zoeteweij

    E-Print Network [OSTI]

    Zoeteweij, Peter

    Lab, Faculty of Electrical Engineering, Mathematics, and Computer Science, Delft University-to-day basis is constantly growing. Combined with a practically constant rate of faults per line of code in the software development cycle, which aim at exposing such discrepancies. In this context, automated diagnosis

  8. Development of a bridge fault extractor tool

    E-Print Network [OSTI]

    Bhat, Nandan D.

    2005-02-17T23:59:59.000Z

    as interlayer faults. An example of an intralayer fault is a bridge between two adjacent metal1 lines. An example of an interlayer fault is a short between overlapping polysilicon and metal1 lines. The rest of this thesis is organized as follows: Chapter 2... between two adjacent 6 metal1 lines. An example of an interlayer fault is a short between overlapping polysilicon and metal1 lines. A recent survey of fault extractors describes their different features [15]. Some tools such as VLASIC [16] attempt...

  9. Donaldson Active Regeneration PM System

    Broader source: Energy.gov (indexed) [DOE]

    Modeling - FEA * Failure Mode Analysis & Life Prediction - Reliability Analysis * FMEA, Fault Tree Analysis, Risk Assessment, etc. Active System Durability & Reliability...

  10. Fault detection methods for vapor-compression air conditioners using electrical measurements

    E-Print Network [OSTI]

    Laughman, Christopher Reed.

    2008-01-01T23:59:59.000Z

    (cont.) This method was experimentally tested and validated on a commercially available air handler and duct system. In the second class of faults studied, liquid refrigerant, rather than vapor, enters the cylinder of a ...

  11. Achieving fault tolerance via robust partitioning and N-Modular Redundancy

    E-Print Network [OSTI]

    O'Connell, Brendan Anthony

    2007-01-01T23:59:59.000Z

    This thesis describes the design and performance results for the P-NMR fault tolerant avionics system architecture being developed at Draper Laboratory. The two key principles of the architecture are robust software ...

  12. Reliability Assessment of Fault-Tolerant Dc-Dc Converters for Photovoltaic Applications

    E-Print Network [OSTI]

    Liberzon, Daniel

    Reliability Assessment of Fault-Tolerant Dc-Dc Converters for Photovoltaic Applications Sairaj V in photovoltaic energy processing applications is presented. The proposed approach acknowledges the influence through several case studies. Index Terms-- Markov reliability modeling, photovoltaic systems, power

  13. An artificial neutral network fault-diagnostic adviser for a nuclear power plant with error prediction

    SciTech Connect (OSTI)

    Kim, Keehoon

    1992-12-31T23:59:59.000Z

    This thesis is part of an ongoing project at Iowa State University to develop ANN bases fault diagnostic systems to detect and classify operational transients at nuclear power plants.

  14. An artificial neutral network fault-diagnostic adviser for a nuclear power plant with error prediction

    SciTech Connect (OSTI)

    Kim, Keehoon.

    1992-01-01T23:59:59.000Z

    This thesis is part of an ongoing project at Iowa State University to develop ANN bases fault diagnostic systems to detect and classify operational transients at nuclear power plants.

  15. Structural relations along the western end of the Arrowhead Fault, Muddy Mountains, Nevada

    E-Print Network [OSTI]

    Temple, Vernon James Jay

    1977-01-01T23:59:59.000Z

    , resembling "drag" effects related to horizontal movement on the Arrowhead fault, are interpreted as the re- sult of a drape-folded fold. The Summit thrust, a local northwesterly trending fault at the eastern end of the study area, is interpreted... Bonanza King Formation Dunderb erg Shale Buffington Formation Ordovician System Monocline Valley Formation Devonian System Muddy Peak Limestone Mississippian Series Rogers Spring Limestone vii xiii 12 12 12 12 13 1) 23 25 25 26 26 26...

  16. Dynamic Motion Graphs Bjrn Krger1, Arno Zinke2, Andreas Weber1

    E-Print Network [OSTI]

    Bonn, Universität

    Dynamic Motion Graphs Björn Krüger1, Arno Zinke2, Andreas Weber1 1Institute of Computer Science II, University of Bonn 2GfaR mbH, Bonn e-mail: {kruegerb, zinke, weber}@cs.uni-bonn.de Introduction Method result. [KTWZ10] KR?GER, B., TAUTGES, J., WEBER, A., AND ZINKE, A. Fast local and global similarity

  17. Jan Baumann1, Bjrn Krger2, Arno Zinke3, Andreas Weber2 1Fraunhofer FKIE, Wachtberg

    E-Print Network [OSTI]

    Bonn, Universität

    Jan Baumann1, Björn Krüger2, Arno Zinke3, Andreas Weber2 1Fraunhofer FKIE, Wachtberg 2Institute of Computer Science II, University of Bonn 3GfaR mbH, Bonn e-mail: {baumannj,kruegerb,zinke,weber [KTWZ10] KR?GER B., TAUTGES J., WEBER A., ZINKE A.: Fast local and global similarity searches in large

  18. Some Aspects of Scouting Smart Environments Jorg Baus, Andreas Butz, Antonio Kruger, Marco Lohse, Cyrille Breihof

    E-Print Network [OSTI]

    Lohse, Marco

    Some Aspects of Scouting Smart Environments Jorg Baus, Andreas Butz, Antonio Kruger, Marco Lohse day. You have just arrived in a city you've never been to before at an airport you don't know. You. From the legend you will get hints, such as \\A1" and \\B5", which are grid cells on the map, where you

  19. The detection of high impedance faults using random fault behavior

    E-Print Network [OSTI]

    Carswell, Patrick Wayne

    1988-01-01T23:59:59.000Z

    In response to an Electric Power Research Institute (EPRI) request for pro- posed solutions for the detection of high impedance faults, the Hughes Aircraft Corporation developed a detection technique based solely on the level of the third harmonic current... for proposed solutions from EPRI that brought the Hughes technique, Power Technologies Incorporated (PTI) proposed a technique which statistically monitors the first, third, and fifth harmonics of current to make a, determination as to the presence of a high...

  20. Extending Performance and Evaluating Risks of PV Systems Failure Using a Fault Tree and Event Tree Approach: Analysis of the Possible Application

    SciTech Connect (OSTI)

    Colli A.

    2012-06-03T23:59:59.000Z

    Performance and reliability of photovoltaic (PV) systems are important issues in the overall evaluation of a PV plant and its components. While performance is connected to the amount of energy produced by the PV installation in the working environmental conditions, reliability impacts the availability of the system to produce the expected amount of energy. In both cases, the evaluation should be done considering information and data coming from indoor as well as outdoor tests. In this paper a way of re-thinking performance, giving it a probabilistic connotation, and connecting the two concepts of performance and reliability is proposed. The paper follows a theoretical approach and discusses the way to obtaining such information, facing benefits and problems. The proposed probabilistic performance accounts for the probability of the system to function correctly, thus passing through the complementary evaluation of the probability of system malfunctions and consequences. Scenarios have to be identified where the system is not functioning properly or at all. They are expected to be combined in a probabilistic safety analysis (PSA) based approach, providing not only the required probability, but also being capable of giving a prioritization of the risks and the most dominant scenario associated to a specific situation. This approach can offer the possibility to highlight the most critical parts of a PV system, as well as providing support in design activities identifying weak connections.

  1. Control of a wind park with doubly fed induction generators in support of power system stability in case of grid faults

    E-Print Network [OSTI]

    Control of a wind park with doubly fed induction generators in support of power system stability, 64283 Darmstadt, Germany * Ris National Laboratory, Wind Energy Department, P.O. Box 49, DK-4000@re.tu-darmstadt.de Abstract The paper presents a control strategy for wind parks based on the doubly fed induction generator

  2. Formal Timing Analysis for FaultTolerant Active Structural Control Systems Wael M. Elseaidy \\Lambda Rance Cleaveland y John W. Baugh Jr. z

    E-Print Network [OSTI]

    Cleaveland, Rance

    The development of inexpensive microprocessors over the past twenty years has prompted engineers to investigate the inclusion of embedded computer control systems in a variety of different engineering applications in aeronautical, mechanical, chemical, and civil engineering arenas, among others. In many cases the structures

  3. High slip rate for a low seismicity along the Palu-Koro active fault in central Sulawesi (Indonesia)

    E-Print Network [OSTI]

    Vigny, Christophe

    High slip rate for a low seismicity along the Palu-Koro active fault in central Sulawesi (Indonesia, Indonesia Introduction Sulawesi Island, eastern Indonesia, is at the triple junction of the Paci®c (through- ABSTRACT In eastern Indonesia, the Central Sulawesi fault system consists of complex left-lateral strike

  4. Abstract Due to reduction in device feature size and supply voltage, the sensitivity to radiation induced transient faults of

    E-Print Network [OSTI]

    Marculescu, Diana

    , the protection from radiation induced transient faults has become as important as other product characteristics to radiation induced transient faults of digital systems increases dramatically. In this paper, we present two targeting radiation hardening leading up to 80% SER reduction when applied to a subset of ISCAS'89

  5. 2954 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 54, NO. 6, DECEMBER 2007 Fault Diagnosis and Reconfiguration for Multilevel

    E-Print Network [OSTI]

    Tolbert, Leon M.

    such as photovoltaic, wind, and fuel cells can be easily interfaced to a multilevel converter system for a high- power. Tolbert, Senior Member, IEEE Abstract--A fault diagnostic and reconfiguration method for a cascaded H. Output phase voltages of the MLID are used as diagnostic signals to detect faults and their locations

  6. Fault detection and isolation in aircraft gas turbine engines. Part 2: validation on a simulation test bed

    E-Print Network [OSTI]

    Ray, Asok

    319 Fault detection and isolation in aircraft gas turbine engines. Part 2: validation of fault detection and isolation (FDI) in aircraft gas turbine engines. The FDI algorithms are built upon,onasimulationtestbed.Thetestbedisbuiltuponanintegratedmodelofageneric two-spool turbofan aircraft gas turbine engine including the engine control system. Keywords: aircraft

  7. Realistic fault modeling and quality test generation of combined delay faults

    E-Print Network [OSTI]

    Thadhlani, Ajaykumar A

    2001-01-01T23:59:59.000Z

    With increasing operating speed and shrinking technology, timing defects in integrated circuits are becoming increasingly important. The well established stuck-at-fault model is not sufficient because it is a static fault ...

  8. Collateral damage: Evolution with displacement of fracture distribution and secondary fault strands in fault damage zones

    E-Print Network [OSTI]

    Savage, Heather M.; Brodsky, Emily E.

    2011-01-01T23:59:59.000Z

    E. McCallum (1999), Reservoir damage around faults: OutcropSkar (2005), Controls on damage zone asymmetry of a normal2007), The evolution of the damage zone with fault growth in

  9. The effects of lithology and initial fault angle in physical models of fault-propagation folds

    E-Print Network [OSTI]

    McLain, Christopher Thomas

    2001-01-01T23:59:59.000Z

    Experimentally deformed physical rock models are used to examine the effects of changing mechanical stratigraphy and initial fault angle on the development of fault-propagation folds over a flat-ramp-flat thrust geometry. This study also...

  10. Collateral damage: Evolution with displacement of fracture distribution and secondary fault strands in fault damage zones

    E-Print Network [OSTI]

    Savage, Heather M.; Brodsky, Emily E.

    2011-01-01T23:59:59.000Z

    8 m fault 14 m fault Lonewolf Wadi Araba Carboneras Caletasiltstone, conglomerate Wadi As Sir Limestone gneiss schistFaulkner et al. , 2003], and Wadi Araba [Du Bernard et al. ,

  11. Fault-tolerant dynamic task graph scheduling

    SciTech Connect (OSTI)

    Kurt, Mehmet C.; Krishnamoorthy, Sriram; Agrawal, Kunal; Agrawal, Gagan

    2014-11-16T23:59:59.000Z

    In this paper, we present an approach to fault tolerant execution of dynamic task graphs scheduled using work stealing. In particular, we focus on selective and localized recovery of tasks in the presence of soft faults. We elicit from the user the basic task graph structure in terms of successor and predecessor relationships. The work stealing-based algorithm to schedule such a task graph is augmented to enable recovery when the data and meta-data associated with a task get corrupted. We use this redundancy, and the knowledge of the task graph structure, to selectively recover from faults with low space and time overheads. We show that the fault tolerant design retains the essential properties of the underlying work stealing-based task scheduling algorithm, and that the fault tolerant execution is asymptotically optimal when task re-execution is taken into account. Experimental evaluation demonstrates the low cost of recovery under various fault scenarios.

  12. Fault detection in an air-handling unit using residual and recursive parameter identification methods

    SciTech Connect (OSTI)

    Lee, W.Y. [Korea Inst. of Energy Research, Taejon (Korea, Republic of); Park, C.; Kelly, G.E. [National Inst. of Standards and Technology, Gaithersburg, MD (United States)

    1996-11-01T23:59:59.000Z

    A scheme for detecting faults in an air-handling unit using residual and parameter identification methods is presented. Faults can be detected by comparing the normal or expected operating condition data with the abnormal, measured data using residuals. Faults can also be detected by examining unmeasurable parameter changes in a model of a controlled system using a system parameter identification technique. In this study, autoregressive moving average with exogenous input (ARMAX) and autoregressive with exogenous input (ARX) models with both single-input/single-output (SISO) and multi-input/single-output (MISO) structures are examined. Model parameters are determined using the Kalman filter recursive identification method. This approach is tested using experimental data from a laboratory`s variable-air-volume (VAV) air-handling unit operated with and without faults.

  13. Detachment Faulting & Geothermal Resources - Pearl Hot Spring...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Faulting & Geothermal Resources - Pearl Hot Spring, NV Conducting a 3D Converted Shear Wave Project to Reduce Exploration Risk at Wister, CA Crump Geyser: High Precision...

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

    E-Print Network [OSTI]

    Andoh, Kwame Sarpong

    2000-01-01T23:59:59.000Z

    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...

  15. Shallow faults mapped with seismic reflections: Lost River Fault, Idaho

    E-Print Network [OSTI]

    Mubarik, Ali; Miller, Richard D.; Steeples, Don W.

    1991-09-01T23:59:59.000Z

    stations 132 and 160. Total bedrock dis?lace- ment interpreted along this seismic survey line is approxa- mately 6 m, representing 4 to 6 times more displacement than is observed on either the common offset refraction section or at the surface..., vol. A, U.S. Geological Survey Open-file Report 85-290, 182-194, 1985. Crone, A. J., and M. N. Macbette, Surface faulting accompa- nying the Borah Peak earthquake, central Idaho, Geology, 12, 664-667, 1984. Crone, A. J., M. N. Macbette, M. G...

  16. Accurate resistive bridge fault modeling, simulation, and test generation

    E-Print Network [OSTI]

    Sar-Dessai, Vijay Ramesh

    1999-01-01T23:59:59.000Z

    Resistive bridging faults in CMOS combinational circuits are studied in this work. Bridging faults are modeled using HSPICE circuit simulation of the various types of bridging faults that can occur in CMOS combinational ...

  17. Earthquake behavior and structure of oceanic transform faults

    E-Print Network [OSTI]

    Roland, Emily Carlson

    2012-01-01T23:59:59.000Z

    Oceanic transform faults that accommodate strain at mid-ocean ridge offsets represent a unique environment for studying fault mechanics. Here, I use seismic observations and models to explore how fault structure affects ...

  18. Accurate resistive bridge fault modeling, simulation, and test generation

    E-Print Network [OSTI]

    Sar-Dessai, Vijay Ramesh

    1999-01-01T23:59:59.000Z

    Resistive bridging faults in CMOS combinational circuits are studied in this work. Bridging faults are modeled using HSPICE circuit simulation of the various types of bridging faults that can occur in CMOS combinational circuits. The results...

  19. Research on Fault Detection and Diagnosis of Scrolling Chiller with ANN

    E-Print Network [OSTI]

    Zhou, Y.; Zheng, J.; Liu, Z.; Yang, C.; Peng, P.

    2006-01-01T23:59:59.000Z

    ICEBO2006, Shenzhen, China Co ntrol Systems for Energy Efficiency and Comfort, Vol. V-5-3 Research on Fault Detection and Diagnosis of Scrolling Chiller with ANN1 Yuli ZHOU Jie ZHENG Zhiju LIU Chaojie YANG Peng PENG... Chiller of Screw Fault Diagnose Artificial Neural Network 1 INTRODUCTION Artificial neural network based on the knowledge of neural network of human brain is to artificially form neural networks to implement some functions. It has powerful...

  20. Software implemented fault-tolernace on distributed-memory MIMD architectures

    E-Print Network [OSTI]

    Holland, Gavin D

    1995-01-01T23:59:59.000Z

    into consideration techniques from each of these protection levels. Fault tolerance techniques may be divided on another dimension according to how they are implemented. Three different categories of fault tolerance methods have been de- fined: l. hardware...-only, and often shared among concurrently executing program in- stances. The data segment varies in size according to the amount of dynamic memory re- quired, and is increased or decreased by calling the sbrk system function call. The stack segment varies...

  1. Off-fault Damage Associated with a Localized Bend in the North Branch San Gabriel Fault, California

    E-Print Network [OSTI]

    Becker, Andrew 1987-

    2012-08-15T23:59:59.000Z

    Structures within very large displacement, mature fault zones, such as the North Branch San Gabriel Fault (NBSGF), are the product of a complex combination of processes. Off-fault damage within a damage zone and first-order geometric asperities...

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

    E-Print Network [OSTI]

    Burrell, Richard Dennis

    1997-01-01T23:59:59.000Z

    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...

  3. An algorithm for faulted phase and feeder selection under high impedance fault conditions

    E-Print Network [OSTI]

    Benner, Carl Lee

    1988-01-01T23:59:59.000Z

    proximate lines served by the same substation. Because of this signal propagation, a fault will be detected simultaneously on the faulted line and possibly several other lines served by the substation. Since it would not be plausible for a utility company... to deenergize the entire area served by a substation due to a high impedance fault on one lateral, a technique is needed to discriminate the faulted line from neighboring healthy feeders and healthy phases of the faulted feeder. Such a technique would also...

  4. active fault segments: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Fault activation Kuzmanov, Georgi 140 Early stage evolution of growth faults: 3D seismic insights from the Levant Basin, Eastern Mediterranean Materials Science Websites...

  5. Fault-tolerant TCP mechanisms

    E-Print Network [OSTI]

    Satapati, Suresh Kumar

    2000-01-01T23:59:59.000Z

    point (TSAPs). In BSD, a service access point is a TCP socket identified by an IP address and port number, A TCP based fault-tolerant service is realized by replicating a server program onto one or more hosts and by having all replicas bind... backup sends the SEQUENCE NUMBER of the segment it recently sent. Since the primary server doesn't exist, the client does not acknowledge. The TCP on backup server keeps retransmitting the same segment, which can be counted to initiate a...

  6. Spatial analysis of hypocenter to fault relationships for determining fault process zone width in Japan.

    SciTech Connect (OSTI)

    Arnold, Bill Walter; Roberts, Barry L.; McKenna, Sean Andrew; Coburn, Timothy C. (Abilene Christian University, Abilene, TX)

    2004-09-01T23:59:59.000Z

    Preliminary investigation areas (PIA) for a potential repository of high-level radioactive waste must be evaluated by NUMO with regard to a number of qualifying factors. One of these factors is related to earthquakes and fault activity. This study develops a spatial statistical assessment method that can be applied to the active faults in Japan to perform such screening evaluations. This analysis uses the distribution of seismicity near faults to define the width of the associated process zone. This concept is based on previous observations of aftershock earthquakes clustered near active faults and on the assumption that such seismic activity is indicative of fracturing and associated impacts on bedrock integrity. Preliminary analyses of aggregate data for all of Japan confirmed that the frequency of earthquakes is higher near active faults. Data used in the analysis were obtained from NUMO and consist of three primary sources: (1) active fault attributes compiled in a spreadsheet, (2) earthquake hypocenter data, and (3) active fault locations. Examination of these data revealed several limitations with regard to the ability to associate fault attributes from the spreadsheet to locations of individual fault trace segments. In particular, there was no direct link between attributes of the active faults in the spreadsheet and the active fault locations in the GIS database. In addition, the hypocenter location resolution in the pre-1983 data was less accurate than for later data. These pre-1983 hypocenters were eliminated from further analysis.

  7. Statistical Fault Detection for Parallel Applications with AutomaDeD

    SciTech Connect (OSTI)

    Bronevetsky, G; Laguna, I; Bagchi, S; de Supinski, B R; Ahn, D; Schulz, M

    2010-03-23T23:59:59.000Z

    Today's largest systems have over 100,000 cores, with million-core systems expected over the next few years. The large component count means that these systems fail frequently and often in very complex ways, making them difficult to use and maintain. While prior work on fault detection and diagnosis has focused on faults that significantly reduce system functionality, the wide variety of failure modes in modern systems makes them likely to fail in complex ways that impair system performance but are difficult to detect and diagnose. This paper presents AutomaDeD, a statistical tool that models the timing behavior of each application task and tracks its behavior to identify any abnormalities. If any are observed, AutomaDeD can immediately detect them and report to the system administrator the task where the problem began. This identification of the fault's initial manifestation can provide administrators with valuable insight into the fault's root causes, making it significantly easier and cheaper for them to understand and repair it. Our experimental evaluation shows that AutomaDeD detects a wide range of faults immediately after they occur 80% of the time, with a low false-positive rate. Further, it identifies weaknesses of the current approach that motivate future research.

  8. Sensor Fault Diagnosis Using Principal Component Analysis

    E-Print Network [OSTI]

    Sharifi, Mahmoudreza

    2010-07-14T23:59:59.000Z

    The purpose of this research is to address the problem of fault diagnosis of sensors which measure a set of direct redundant variables. This study proposes: 1. A method for linear senor fault diagnosis 2. An analysis of isolability and detectability...

  9. Sensor Fault Diagnosis Using Principal Component Analysis

    E-Print Network [OSTI]

    Sharifi, Mahmoudreza

    2010-07-14T23:59:59.000Z

    The purpose of this research is to address the problem of fault diagnosis of sensors which measure a set of direct redundant variables. This study proposes: 1. A method for linear senor fault diagnosis 2. An analysis of isolability and detectability...

  10. INDUCTION MOTOR FAULT DIAGNOSTIC AND MONITORING METHODS

    E-Print Network [OSTI]

    Povinelli, Richard J.

    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

  11. Self-triggering superconducting fault current limiter

    DOE Patents [OSTI]

    Yuan, Xing (Albany, NY); Tekletsadik, Kasegn (Rexford, NY)

    2008-10-21T23:59:59.000Z

    A modular and scaleable Matrix Fault Current Limiter (MFCL) that functions as a "variable impedance" device in an electric power network, using components made of superconducting and non-superconducting electrically conductive materials. The matrix fault current limiter comprises a fault current limiter module that includes a superconductor which is electrically coupled in parallel with a trigger coil, wherein the trigger coil is magnetically coupled to the superconductor. The current surge doing a fault within the electrical power network will cause the superconductor to transition to its resistive state and also generate a uniform magnetic field in the trigger coil and simultaneously limit the voltage developed across the superconductor. This results in fast and uniform quenching of the superconductors, significantly reduces the burnout risk associated with non-uniformity often existing within the volume of superconductor materials. The fault current limiter modules may be electrically coupled together to form various "n" (rows).times."m" (columns) matrix configurations.

  12. June 2000 Wchter Andreas , Biegler Lorenz T. Failure of Global ...

    E-Print Network [OSTI]

    Varying the Population Size of Artificial Foraging Swarms on Time Varying Landscapes ... Solving systems of nonlinear equations with continuous GRASP ... Lifting Inequalities: A framework for generating strong cuts in nonlinear programs

  13. Papers by Andrea Milani List updated January 2013

    E-Print Network [OSTI]

    Milani, Andrea

    .Catalano, R.M c Crosky, A.Milani & A.M.Nobili: Optical tracking of synchronous Earth's satellites structure of the outer Solar System, Celestial Me chanics 35, 269--287, 1985 25. A.Milani : Stability

  14. Multi-Task Learning and Matrix Regularization Andreas Argyriou

    E-Print Network [OSTI]

    Stephens, Matthew

    (contd.) Marketing databases, collaborative filtering, recommendation systems (e.g. Netflix); task functions ft(x) = wt, x t = 1, . . . , n (we ignore nonlinearities for the moment) Want to impose common

  15. Steps toward fault-tolerant quantum chemistry.

    SciTech Connect (OSTI)

    Taube, Andrew Garvin

    2010-05-01T23:59:59.000Z

    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).

  16. Quality monitored distributed voting system

    DOE Patents [OSTI]

    Skogmo, D.

    1997-03-18T23:59:59.000Z

    A quality monitoring system can detect certain system faults and fraud attempts in a distributed voting system. The system uses decoy voters to cast predetermined check ballots. Absent check ballots can indicate system faults. Altered check ballots can indicate attempts at counterfeiting votes. The system can also cast check ballots at predetermined times to provide another check on the distributed voting system. 6 figs.

  17. Quality monitored distributed voting system

    DOE Patents [OSTI]

    Skogmo, David (Albuquerque, NM)

    1997-01-01T23:59:59.000Z

    A quality monitoring system can detect certain system faults and fraud attempts in a distributed voting system. The system uses decoy voters to cast predetermined check ballots. Absent check ballots can indicate system faults. Altered check ballots can indicate attempts at counterfeiting votes. The system can also cast check ballots at predetermined times to provide another check on the distributed voting system.

  18. Unitary reflection groups for quantum fault tolerance

    E-Print Network [OSTI]

    Michel Planat; Maurice R. Kibler

    2009-02-24T23:59:59.000Z

    This paper explores the representation of quantum computing in terms of unitary reflections (unitary transformations that leave invariant a hyperplane of a vector space). The symmetries of qubit systems are found to be supported by Euclidean real reflections (i.e., Coxeter groups) or by specific imprimitive reflection groups, introduced (but not named) in a recent paper [Planat M and Jorrand Ph 2008, {\\it J Phys A: Math Theor} {\\bf 41}, 182001]. The automorphisms of multiple qubit systems are found to relate to some Clifford operations once the corresponding group of reflections is identified. For a short list, one may point out the Coxeter systems of type $B_3$ and $G_2$ (for single qubits), $D_5$ and $A_4$ (for two qubits), $E_7$ and $E_6$ (for three qubits), the complex reflection groups $G(2^l,2,5)$ and groups No 9 and 31 in the Shephard-Todd list. The relevant fault tolerant subsets of the Clifford groups (the Bell groups) are generated by the Hadamard gate, the $\\pi/4$ phase gate and an entangling (braid) gate [Kauffman L H and Lomonaco S J 2004 {\\it New J. of Phys.} {\\bf 6}, 134]. Links to the topological view of quantum computing, the lattice approach and the geometry of smooth cubic surfaces are discussed.

  19. Unitary reflection groups for quantum fault tolerance

    E-Print Network [OSTI]

    Planat, Michel

    2008-01-01T23:59:59.000Z

    This paper explores the representation of quantum computing in terms of unitary reflections (unitary transformations that leaves invariant a hyperplane of a vector space). The symmetries of qubit systems are found to be supported by Euclidean real reflections (i.e., Coxeter groups) or by specific imprimitive reflection groups, introduced (but not named) in a recent paper [Planat M and Jorrand Ph 2008, J Phys A: Math Theor 41, 182001]. The automorphisms of multiple qubit systems are found to relate to some Clifford operations once the corresponding group of reflections is identified. For a short list, one may point out the Coxeter systems of type B3 and G2 (for single qubits), D5 and A4 (for two qubits), E7 and E6 (for three qubits), and the complex reflection groups G(2l, 2, 5). The relevant fault tolerant groups of reflections (the Bell groups) are generated, as subgroups of the Clifford groups, by the Hadamard gate, the $\\pi$/4 phase gate and an entangling (braid) gate [Kauffman L H and Lomonaco S J 2004 Ne...

  20. A Hybrid Rule-Based/Case-Based Reasoning Approach for Service Fault Diagnosis

    E-Print Network [OSTI]

    affecting the service quality and a reasonable balance between the fault management effort and the costs of network and systems management. Our hybrid architecture consists of a rule-based reasoning module, whose in opposition to network and systems management. While the events that are encountered in network and systems

  1. Earthquake Recurrence in Simulated Fault Systems

    E-Print Network [OSTI]

    Dieterich, James H.; Richards-Dinger, Keith B.

    2010-01-01T23:59:59.000Z

    pubs.usgs.gov/of/2007/143. Z HENG , G. and R ICE , J. R. (B EROZA and M IKUMO , 1996; Z HENG and R ICE , 1998). In our

  2. Underground distribution cable incipient fault diagnosis system

    E-Print Network [OSTI]

    Jaafari Mousavi, Mir Rasoul

    2007-04-25T23:59:59.000Z

    INTRODUCTION 1.1 PREFACE The power industry has been developing into a challenging and competitive environment due to the ongoing restructuring and deregulation. This structural change has required the electric utilities to reduce operating costs...

  3. Fault-Tolerant CCM Middleware for Embedded Adaptive Dependability (MEAD)

    E-Print Network [OSTI]

    Narasimhan, Priya

    Fault-Tolerant CCM Middleware for Embedded Adaptive Dependability (MEAD) Real-Time Fault Narasimhan Carnegie Mellon University CCM Workshop, Nashville, TN December 10, 2003 #12;12/11/2003 Page 2 Model precursor to a real-time fault tolerant CCM Real-Time Fault Tolerant CORBA Standard RFP launched

  4. PoX: Protecting Users from Malicious Facebook Applications Manuel Egele, Andreas Moser, Christopher Kruegel, and Engin Kirda

    E-Print Network [OSTI]

    Kruegel, Christopher

    PoX: Protecting Users from Malicious Facebook Applications Manuel Egele, Andreas Moser, Christopher@ccs.neu.edu Abstract--Online social networks such as Facebook, MyS- pace, and Orkut store large amounts of sensitive are not convincing. Therefore, we introduce PoX, an extension for Facebook that makes all requests for private data

  5. Local Solutions of Optimal Power Flow Waqquas A. Bukhsh, Andreas Grothey, Ken McKinnon, and Paul Trodden

    E-Print Network [OSTI]

    Grothey, Andreas

    is primarily due to Kirchhoff's voltage law (KVL), which describes the flow of power in transmission lines that minimizes the cost of electric power generation while satisfying operating constraints and meeting demandLocal Solutions of Optimal Power Flow Waqquas A. Bukhsh, Andreas Grothey, Ken McKinnon, and Paul

  6. Optical Rotatory and Circular Dichroic Scattering Werner Kaminsky,* Morten Andreas Geday, Javier Herreros-Cedres, and Bart Kahr*

    E-Print Network [OSTI]

    Kaminsky, Werner

    Optical Rotatory and Circular Dichroic Scattering Werner Kaminsky,* Morten Andreas Geday, Javier, Washington 98195-1700 ReceiVed: June 23, 2002; In Final Form: NoVember 5, 2002 Optical effects are observed in regularly dyed crystals that serve to mimic optical rotation and circular dichroism by rotating the azimuth

  7. Mechanisms for Data Quality and Validation in Citizen Science Andrea Wiggins, Greg Newman, Robert D. Stevenson, and Kevin Crowston

    E-Print Network [OSTI]

    Crowston, Kevin

    Mechanisms for Data Quality and Validation in Citizen Science Andrea Wiggins, Greg Newman, Robert D for researchers employing a public participation in scientific research (PPSR) or "citizen science" approach be used to guide project design. Keywords-citizen science; data quality; data validation I. INTRODUCTION

  8. Rapid disintegration of Alpine glaciers observed with satellite data Frank Paul, Andreas Kaab, Max Maisch, Tobias Kellenberger, and Wilfried Haeberli

    E-Print Network [OSTI]

    Kb, Andreas

    Rapid disintegration of Alpine glaciers observed with satellite data Frank Paul, Andreas Ka 12 November 2004. [1] Analyses of multispectral satellite data indicate accelerated glacier decline around the globe since the 1980s. By using digitized glacier outlines inferred from the 1973 inventory

  9. New Peptidomimetic Polymers for Antifouling Surfaces Andrea R. Statz, Robert J. Meagher, Annelise E. Barron, and Phillip B. Messersmith*,

    E-Print Network [OSTI]

    Barron, Annelise E.

    New Peptidomimetic Polymers for Antifouling Surfaces Andrea R. Statz, Robert J. Meagher, Annelise E biofouling consist of grafting antifouling polymers or self-assembled monolayers onto surfaces.4 A variety of synthetic polymers have been investigated as anti- fouling coatings and have met with variable success

  10. Building Storage Appliances for the Grid and Beyond John Bent, Andrea Arpaci-Dusseau, Remzi Arpaci-Dusseau, Miron Livny

    E-Print Network [OSTI]

    Wisconsin at Madison, University of

    Building Storage Appliances for the Grid and Beyond John Bent, Andrea Arpaci-Dusseau, Remzi Arpaci,dusseau,remzi,miron@cs.wisc.edu Abstract Current storage appliances have been traditionally de- signed to meet either the storage demands challenges to storage ap- pliances that would be used on the grid. NeST is a user-level software-only storage

  11. Building Storage Appliances for the Grid and Beyond John Bent, Andrea ArpaciDusseau, Remzi ArpaciDusseau, Miron Livny

    E-Print Network [OSTI]

    Wisconsin at Madison, University of

    Building Storage Appliances for the Grid and Beyond John Bent, Andrea ArpaciDusseau, Remzi Arpaci,dusseau,remzi,miron@cs.wisc.edu Abstract Current storage appliances have been traditionally de signed to meet either the storage demands challenges to storage ap pliances that would be used on the grid. NeST is a userlevel softwareonly storage

  12. Mechanical Models of Fault-Related Folding

    SciTech Connect (OSTI)

    Johnson, A. M.

    2003-01-09T23:59:59.000Z

    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).

  13. 1. Detect ground faults in PV arrays mounted on the roofs of 2. Interrupt the fault current

    E-Print Network [OSTI]

    Johnson, Eric E.

    1. Detect ground faults in PV arrays mounted on the roofs of dwellings 2. Interrupt the fault current 3. Indicate that a ground fault had occurred 4. Disconnect the faulted part of the PV array 5. "Crowbar" (short-circuit) the PV array The original GFPD prototype was developed in two versions that were

  14. Preliminary photovoltaic arc-fault prognostic tests using sacrificial fiber optic cabling.

    SciTech Connect (OSTI)

    Johnson, Jay; Blemel, Kenneth D. [Sentient Business Systems, Inc., Albuquerque, NM; Peter, Francis [Sentient Business Systems, Inc., Albuquerque, NM

    2013-02-01T23:59:59.000Z

    Through the New Mexico Small Business Assistance Program, Sandia National Laboratories worked with Sentient Business Systems, Inc. to develop and test a novel photovoltaic (PV) arc-fault detection system. The system operates by pairing translucent polymeric fiber optic sensors with electrical circuitry so that any external abrasion to the system or internal heating causes the fiber optic connection to fail or detectably degrade. A periodic pulse of light is sent through the optical path using a transmitter-receiver pair. If the receiver does not detect the pulse, an alarm is sounded and the PV system can be de-energized. This technology has the unique ability to prognostically determine impending failures to the electrical system in two ways: (a) the optical connection is severed prior to physical abrasion or cutting of PV DC electrical conductors, and (b) the polymeric fiber optic cable melts via Joule heating before an arc-fault is established through corrosion. Three arc-faults were created in different configurations found in PV systems with the integrated fiber optic system to determine the feasibility of the technology. In each case, the fiber optic cable was broken and the system annunciated the fault.

  15. Fault Tolerant Control using Cartesian Genetic Programming

    E-Print Network [OSTI]

    Fernandez, Thomas

    Fault Tolerant Control using Cartesian Genetic Programming Yoshikazu Hirayama University of York]: Robotics-- Sensors; F.2.2 [Analysis of Algorithms and Problem Complexity]: Nonnumerical Algorithms and Problems General Terms Algorithms, Reliability Keywords cartesian genetic programming, evolutionary

  16. Fault-tolerant quantum computing with color codes

    E-Print Network [OSTI]

    Andrew J. Landahl; Jonas T. Anderson; Patrick R. Rice

    2011-08-29T23:59:59.000Z

    We present and analyze protocols for fault-tolerant quantum computing using color codes. We present circuit-level schemes for extracting the error syndrome of these codes fault-tolerantly. We further present an integer-program-based decoding algorithm for identifying the most likely error given the syndrome. We simulated our syndrome extraction and decoding algorithms against three physically-motivated noise models using Monte Carlo methods, and used the simulations to estimate the corresponding accuracy thresholds for fault-tolerant quantum error correction. We also used a self-avoiding walk analysis to lower-bound the accuracy threshold for two of these noise models. We present and analyze two architectures for fault-tolerantly computing with these codes: one with 2D arrays of qubits are stacked atop each other and one in a single 2D substrate. Our analysis demonstrates that color codes perform slightly better than Kitaev's surface codes when circuit details are ignored. When these details are considered, we estimate that color codes achieve a threshold of 0.082(3)%, which is higher than the threshold of $1.3 \\times 10^{-5}$ achieved by concatenated coding schemes restricted to nearest-neighbor gates in two dimensions but lower than the threshold of 0.75% to 1.1% reported for the Kitaev codes subject to the same restrictions. Finally, because the behavior of our decoder's performance for two of the noise models we consider maps onto an order-disorder phase transition in the three-body random-bond Ising model in 2D and the corresponding random-plaquette gauge model in 3D, our results also answer the Nishimori conjecture for these models in the negative: the statistical-mechanical classical spin systems associated to the 4.8.8 color codes are counterintuitively more ordered at positive temperature than at zero temperature.

  17. Microscopic feather fractures in the faulting process

    E-Print Network [OSTI]

    Conrad, Robert Eugene

    1974-01-01T23:59:59.000Z

    . Naximum compressive stress trajectories in a photoelastic model are shown by solid lines. Short lines are drawn on isoclinics in crossed polarized light at 10' intervals of rotation. Load axis is N-S. stress (o'I) trajectories curve near the fault..., maximum compressive stress, trajectories to a two dimensional during sliding along (dashed lines) in a cylindrical specimen reduced elastic problem. (b) Expected ol trajectories a fault. crack by shear along the crack surfaces (Bieniawski, 1967...

  18. NREL, CENTER FOR TRANSPORTATION TECHNOLOGIES AND SYSTEMS 1 Fuel Cell Vehicle Systems Analysis

    E-Print Network [OSTI]

    at 2003 Future Transportation Technology Conference 7/03* Expand database of fuel cell components 9NREL, CENTER FOR TRANSPORTATION TECHNOLOGIES AND SYSTEMS 1 Fuel Cell Vehicle Systems Analysis Tony Markel, Keith Wipke, Kristina Haraldsson, Ken Kelly, Andreas Vlahinos National Renewable Energy

  19. Non-Concurrent Error Detection and Correction in Fault-Tolerant Discrete-Time LTI

    E-Print Network [OSTI]

    Hadjicostis, Christoforos

    Non-Concurrent Error Detection and Correction in Fault-Tolerant Discrete-Time LTI Dynamic Systems encoded form and allow error detection and correction to be performed through concurrent parity checks (i that allows parity checks to capture the evolution of errors in the system and, based on non-concurrent parity

  20. Localization and Manipulation of Small Parts Using GelSight Tactile Rui Li, Robert Platt Jr., Wenzhen Yuan*, Andreas ten Pas*, Nathan Roscup*, Mandayam A. Srinivasan,

    E-Print Network [OSTI]

    Gabrieli, John

    Localization and Manipulation of Small Parts Using GelSight Tactile Sensing Rui Li, Robert Platt Jr Laboratory at MIT, and Mandayam A. Srinivasan is with MIT Touch Lab. Robert Platt Jr., Andreas ten Pas

  1. Abstract-A fault detection and reconfiguration technique for a cascaded H-bridge 11-level inverter drives during faulty condition

    E-Print Network [OSTI]

    Tolbert, Leon M.

    it uses several dc voltage sources which would be available from batteries or fuel cells [1]. A possible can be used as a diagnostic signal to detect faults and their locations. AI-based techniques are used with simulation and experimental results. The developed fault diagnostic system requires about 6 cycles (~100 ms

  2. Collateral damage: Evolution with displacement of fracture distribution and secondary fault strands in fault

    E-Print Network [OSTI]

    Savage, Heather M.

    Collateral damage: Evolution with displacement of fracture distribution and secondary fault strands in fault damage zones Heather M. Savage1,2 and Emily E. Brodsky1 Received 22 April 2010; revised 10 of fracture distributions as a function of displacement to determine whether damage around small and large

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

    SciTech Connect (OSTI)

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

    2011-05-15T23:59:59.000Z

    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.

  4. Crossing Active Faults on the Sakhalin II Onshore Pipeline Route: Pipeline Design and Risk Analysis

    SciTech Connect (OSTI)

    Mattiozzi, Pierpaolo [Snamprogetti-Saipem, Via Toniolo, 1, 61032 Fano (Italy); Strom, Alexander [Institute of Geospheres Dynamics, Leninskiy Avenue, 38, Building 1, 119334, Moscow (Russian Federation)

    2008-07-08T23:59:59.000Z

    Twin oil (20 and 24 inch) and gas (20 and 48 inch) pipeline systems stretching 800 km are being constructed to connect offshore hydrocarbon deposits from the Sakhalin II concession in the North to an LNG plant and oil export terminal in the South of Sakhalin island. The onshore pipeline route follows a regional fault zone and crosses individual active faults at 19 locations. Sakhalin Energy, Design and Construction companies took significant care to ensure the integrity of the pipelines, should large seismic induced ground movements occur during the Operational life of the facilities. Complex investigations including the identification of the active faults, their precise location, their particular displacement values and assessment of the fault kinematics were carried out to provide input data for unique design solutions. Lateral and reverse offset displacements of 5.5 and 4.5 m respectively were determined as the single-event values for the design level earthquake (DLE) - the 1000-year return period event. Within the constraints of a pipeline route largely fixed, the underground pipeline fault crossing design was developed to define the optimum routing which would minimize stresses and strain using linepipe materials which had been ordered prior to the completion of detailed design, and to specify requirements for pipe trenching shape, materials, drainage system, etc. Detailed Design was performed with due regard to actual topography and to avoid the possibility of the trenches freezing in winter, the implementation of specific drainage solutions and thermal protection measures.

  5. Crossing Active Faults on the Sakhalin II Onshore Pipeline Route: Analysis Methodology and Basic Design

    SciTech Connect (OSTI)

    Vitali, Luigino [Snamprogetti-Saipem, Via Toniolo, 1, 61032 Fano, Luigino (Italy); Mattiozzi, Pierpaolo [Snamprogetti-Saipem, Via Toniolo, 1, 61032 Fano (Italy)

    2008-07-08T23:59:59.000Z

    Twin oil (20 and 24 inch) and gas (20 and 48 inch) pipeline systems stretching 800 km are being constructed to connect offshore hydrocarbon deposits from the Sakhalin II concession in the North to an LNG plant and oil export terminal in the South of Sakhalin island. The onshore pipeline route follows a regional fault zone and crosses individual active faults at 19 locations. Sakhalin Energy, Design and Construction companies took significant care to ensure the integrity of the pipelines, should large seismic induced ground movements occur during the Operational life of the facilities. Complex investigations including the identification of the active faults, their precise location, their particular displacement values and assessment of the fault kinematics were carried out to provide input data for unique design solutions. Lateral and reverse offset displacements of 5.5 and 4.5 m respectively were determined as the single-event values for the design level earthquake (DLE)--the 1000-year return period event. Within the constraints of a pipeline route largely fixed, the underground pipeline fault crossing design was developed to define the optimum routing which would minimize stresses and strain using linepipe materials which had been ordered prior to the completion of detailed design, and to specify requirements for pipe trenching shape, materials, drainage system, etc. This Paper describes the steps followed to formulate the concept of the special trenches and the analytical characteristics of the Model.

  6. Faulted joints: kinematics, displacementlength scaling relations and criteria for their identication

    E-Print Network [OSTI]

    Engelder, Terry

    and kinematics based on two sets of joints, pinnate joints and fault striations, reveal that some mesoscale faults (i.e., faults without linked fault segments) at the mesoscale: neoformed faults which form

  7. Robust Condition Monitoring and Fault Diagnosis of Variable Speed Induction Motor Drives

    E-Print Network [OSTI]

    Choi, Seungdeog

    2012-02-14T23:59:59.000Z

    The main types of faults studied in the literature are commonly categorized as electrical faults and mechanical faults. In addition to well known faults, the performance of a diagnostic algorithm and its operational reliability in harsh environments...

  8. Community Fault Model (CFM) for Southern California by Andreas Plesch, John H. Shaw, Christine Benson, William A. Bryant, Sara Carena, Michele

    E-Print Network [OSTI]

    Cooke, Michele

    Benson, William A. Bryant, Sara Carena, Michele Cooke, James Dolan, Gary Fuis, Eldon Gath, Lisa Grant

  9. Synthesis and evaluation of fault-tolerant quantum computer architectures

    E-Print Network [OSTI]

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

    2005-01-01T23:59:59.000Z

    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 ...

  10. FEATURE BASED HANDLING OF SURFACE FAULTS IN COMPACT DISC PLAYERS

    E-Print Network [OSTI]

    Wickerhauser, M. Victor

    two photo detectors. The distances are the distance from the actual position of the OPU such surface faults. The core idea is not to rely on sensor information during the fault. The sensor signals

  11. Observations on the capability of the Criner fault, southern Oklahoma

    E-Print Network [OSTI]

    Williamson, Shawn Collin

    1996-01-01T23:59:59.000Z

    of the present study suggest that the Criner fault is an old tectonic feature with a deceptively youthful geomorphic appearance. Differential erosion has likely exhumed the Criner fault-line scarp in the resistant Ordovician limestone of the Criner Hills...

  12. Design and analysis of a fault tolerant network processor

    E-Print Network [OSTI]

    Desai, Shaishav A

    1998-01-01T23:59:59.000Z

    This thesis investigates the effect of transient faults on a processor and proposes on-chip fault tolerant design techniques to improve its reliability. The target processor is a general 32-bit, four stage pipeline, dual context RISC style design...

  13. Frictional properties of faults: from observation on the

    E-Print Network [OSTI]

    Winfree, Erik

    Frictional properties of faults: from observation on the Longitudinal Valley Fault, Taiwan myself lucky to do what I love and to wake up every day, happy and excited about the day to come

  14. New approach to the fault location problem using synchronized sampling

    E-Print Network [OSTI]

    Mrkic, Jasna

    1994-01-01T23:59:59.000Z

    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...

  15. VCSEL fault location apparatus and method

    DOE Patents [OSTI]

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

    2007-05-15T23:59:59.000Z

    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.

  16. Symmetrical and Unsymmetrical Fault Currents of a Wind Power Plant: Preprint

    SciTech Connect (OSTI)

    Gevorgian, V.; Singh, M.; Muljadi, E.

    2011-12-01T23:59:59.000Z

    This paper investigates the short-circuit behavior of a wind power plant for different types of wind turbines. Both symmetrical faults and unsymmetrical faults are investigated. The size of wind power plants (WPPs) keeps getting bigger and bigger. The number of wind plants in the U.S. has increased very rapidly in the past 10 years. It is projected that in the U.S., the total wind power generation will reach 330 GW by 2030. As the importance of WPPs increases, planning engi-neers must perform impact studies used to evaluate short-circuit current (SCC) contribution of the plant into the transmission network under different fault conditions. This information is needed to size the circuit breakers, to establish the proper sys-tem protection, and to choose the transient suppressor in the circuits within the WPP. This task can be challenging to protec-tion engineers due to the topology differences between different types of wind turbine generators (WTGs) and the conventional generating units. This paper investigates the short-circuit behavior of a WPP for different types of wind turbines. Both symmetrical faults and unsymmetrical faults are investigated. Three different soft-ware packages are utilized to develop this paper. Time domain simulations and steady-state calculations are used to perform the analysis.

  17. A Fusing Switch for Fault Suppression in the SNS High Voltage Converter Modulators

    SciTech Connect (OSTI)

    Kemp, Mark A.; Burkhart, Craig; Nguyen, Minh N.; /SLAC; Anderson, David E.; /Oak Ridge

    2009-08-03T23:59:59.000Z

    The High Voltage Converter Modulators (HVCMs) at the Spallation Neutron Source (SNS) have operated in excess of a combined 250,000 hours. Performance and reliability improvements to the HVCM are ongoing to increase modulator availability as accelerator system demands increase. There is a relatively large amount of energy storage in the HVCMs, {approx}180 kJ. This energy has the potential to dump into unsuppressed faults, cause damage, and increase the time to repair. The 'fusing switch' concept involves isolation of this stored energy from the location of the most common faults. This paper introduces this concept and its application to the HVCMs.

  18. Fault seal analysis of Okan and Meren fields, Nigeria

    SciTech Connect (OSTI)

    Eisenberg, R.A. [Chevron Petroleum Technology Co., La Habra, CA (United States); Brenneman, R.J. [Chevron Overseas Petroleum Co., San Ramon, CA (United States); Adeogba, A.A. [Chevron Nigeria Ltd., Lagos (Nigeria)

    1995-08-01T23:59:59.000Z

    The sealing capacity and the dynamic seal behavior of faults between juxtaposed reservoirs were analyzed for Okan and Meren fields, offshore Nigeria. In both fields correlations were found between reservoir performance, juxtaposed fluid types, oil geochemistry, interpreted fluid contact relationships, fault sealing/leaking condition, and calculated smear gouge ratios. Integration of these data has been invaluable in quantifying fault seal risk and may effect depletion strategies for fault-juxtaposed reservoirs within these fields. Fault plane sections defined reservoir juxtapositions and aided visualization of potential cross-fault spill points. Smear gouge ratios calculated from E-logs were used to estimate the composition of fault-gouge materials between the juxtaposed reservoirs. These tools augmented interpretation of seal/nonseal character based on fluid contact relationships in proved reservoirs and, in addition, were used to quantify fault seal risk of untested fault-dependent closures in Okan. The results of these analyses were then used to interpret production-induced fault seal breakdown within the G-sands and also to risk seal integrity of fault dependent closures within the untested O-sands in an adjacent, upthrown fault block. Within this fault block the presence of potential fault intersection leak points and large areas of sand/sand juxtaposition with high smear gouge ratios (low sealing potential) limits potential reserves within the O-sand package. In Meren Field the E- and G-sands are juxtaposed, on different pressure decline, geochemically distinct, and are characterized by low smear gouge ratios. In contrast, specific G- and H-sands, juxtaposed across the same fault, contain similar OOWCs and are characterized by high smear gouge ratios. The cross-sealing and/or cross-leaking nature of compartment boundaries at Meren is related to fault displacement variation and the composition of displaced stratigraphy.

  19. Detachment Faulting & Geothermal Resources- Pearl Hot Spring, NV

    Broader source: Energy.gov [DOE]

    Detachment Faulting & Geothermal Resources - Pearl Hot Spring, NV presentation at the April 2013 peer review meeting held in Denver, Colorado.

  20. Understanding Fault Characteristics of Inverter-Based Distributed Energy Resources

    SciTech Connect (OSTI)

    Keller, J.; Kroposki, B.

    2010-01-01T23:59:59.000Z

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

  1. Experimental wrench faulting at confining pressure

    E-Print Network [OSTI]

    Bartlett, Wendy Louise

    1980-01-01T23:59:59.000Z

    along the precut, resembling the "flower or palm tree" structure noted by Sylvester and Smith (1976), in the Salton Sea area, California. The bounding fault above the down-dropped block dips at a lower angle to the forcing block-veneer interface than..., the oeometries, ori- gins, and sequence of development of structural elements comprising the fault zones. Specimens (2. 8 or 3. 4 x 3. 4 x 9. 4 cm) are loaded parallel to their longest dimension, at an average displacement rate -3 -1 of 7. 3 x 10 cm sec...

  2. Temporal data mining for root-cause analysis of machine faults in automotive assembly lines

    E-Print Network [OSTI]

    Laxman, Srivatsan; Unnikrishnan, K P; Sastry, P S

    2009-01-01T23:59:59.000Z

    Engine assembly is a complex and heavily automated distributed-control process, with large amounts of faults data logged everyday. We describe an application of temporal data mining for analyzing fault logs in an engine assembly plant. Frequent episode discovery framework is a model-free method that can be used to deduce (temporal) correlations among events from the logs in an efficient manner. In addition to being theoretically elegant and computationally efficient, frequent episodes are also easy to interpret in the form actionable recommendations. Incorporation of domain-specific information is critical to successful application of the method for analyzing fault logs in the manufacturing domain. We show how domain-specific knowledge can be incorporated using heuristic rules that act as pre-filters and post-filters to frequent episode discovery. The system described here is currently being used in one of the engine assembly plants of General Motors and is planned for adaptation in other plants. To the best ...

  3. FDD Algorithm for an AHU Reverse-Return System

    E-Print Network [OSTI]

    Djuric, N.; Novakovic, V.

    A fault detection and diagnosis (FDD) algorithm was developed for an AHU reverse-return system for air cooling. These FDD rules were generated using simulation in three steps. Cause-effect rules were established by connecting the faults...

  4. Electrically heated particulate filter diagnostic systems and methods

    DOE Patents [OSTI]

    Gonze, Eugene V [Pinckney, MI

    2009-09-29T23:59:59.000Z

    A system that diagnoses regeneration of an electrically heated particulate filter is provided. The system generally includes a grid module that diagnoses a fault of the grid based on at least one of a current signal and a voltage signal. A diagnostic module at least one of sets a fault status and generates a warning signal based on the fault of the grid.

  5. Observability-aware Directed Test Generation for Soft Errors and Crosstalk Faults

    E-Print Network [OSTI]

    Mishra, Prabhat

    . In modern System- on-Chip (SoC) design methodology, it is found that regions where errors are detectedObservability-aware Directed Test Generation for Soft Errors and Crosstalk Faults Kanad Basu Syst emerged as an important component of any chip design methodology to detect both functional and electrical

  6. A study on the reliability improvement factor of fault tolerant mechanisms Jongwhoa Na, Dongwoo Lee

    E-Print Network [OSTI]

    Boyer, Edmond

    -tolerant mechanism I. INTRODUCTION In the safety-critical embedded systems (SCES) in aircrafts and automobiles, fault history. However, because of the fast developing speed in VLSI/SoC technology, it is difficult to keep the usage history of the components of the modern SCES. This calls for a reliability index without usage

  7. Reaction localization and softening of texturally hardened mylonites in a reactivated fault zone, central Argentina

    E-Print Network [OSTI]

    Whitmeyer, Steven J.

    , central Argentina S. J. WHITMEYER1 * AND R. P. WINTSCH2 1 Department of Earth Sciences, Boston University, central Argentina, experienced multiple ductile deformation and faulting events that involved a variety of replacement reactions in a partially open system. Key words: Argentina; reaction localization; reactivation

  8. FaultTolerant Distributed Algorithms in Sparse Ad Hoc Wireless Networks

    E-Print Network [OSTI]

    FaultTolerant Distributed Algorithms in Sparse Ad Hoc Wireless Networks (SPAWN) BETTINA WEISS communication technologies, wireless ad hoc networks are increasingly commonplace nowadays. Spontaneous (``ad wireless sensor networks and disaster area communication systems. It is also a major enabling technology

  9. Mechanical fault detection in induction motor drives through stator current monitoring -Theory

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    vibrations lead to acoustic noise, noise monitoring is also a possible approach. However, these methods0 Mechanical fault detection in induction motor drives through stator current monitoring - Theory machines are a key element in many electrical systems. Amongst all types of electric motors, induction

  10. Chasing the FLP Impossibility Result in a LAN How Robust Can a Fault Tolerant Server Be?

    E-Print Network [OSTI]

    Défago, Xavier

    parameter is the time- out used by our heartbeat failure detectors. The frequency of heartbeats is keptChasing the FLP Impossibility Result in a LAN or How Robust Can a Fault Tolerant Server Be? P proven an impossibility result about consensus in the asyn- chronous system model, and similar

  11. Scenario-Based Fault-Tolerant Model Predictive Control for Diesel-Electric Marine Power Plant

    E-Print Network [OSTI]

    Johansen, Tor Arne

    Scenario-Based Fault-Tolerant Model Predictive Control for Diesel-Electric Marine Power Plant Email: torstein.bo@itk.ntnu.no, tor.arne.johansen@itk.ntnu.no Abstract--Diesel-electric propulsion generation control, Ma- rine safety, Optimal control. I. INTRODUCTION Diesel electric propulsion is a system

  12. Mapping of grid faults and grid codes Florin Iov, Anca Daniela Hansen, Poul Srensen,

    E-Print Network [OSTI]

    to clarify and define possible new directions in the certification process of power plant wind turbines, namely wind turbines, which participate actively in the stabilisation of power systems. Practical-Ontario 27 3.8.4 Conclusions 28 3.9 Summary 28 4 Fault analysis 30 4.1 Simulation Model 30 4.2 Study cases 32

  13. Genetic Programming Approach for Fault Modeling of Electronic Hardware Ajith Abraham

    E-Print Network [OSTI]

    Fernandez, Thomas

    performance monitoring of electronic circuits and systems. Reliability modeling of electronic circuits can discussed in Section 2. This technique can be extended to simple electronic components and for complicatedGenetic Programming Approach for Fault Modeling of Electronic Hardware Ajith Abraham School

  14. Induction Motor Stator Faults Diagnosis by a Current Concordia Pattern Based

    E-Print Network [OSTI]

    Boyer, Edmond

    and diagnosis process can be achieved. The proposed fuzzy approach is based on the stator current Concordia information on the health state of induction motors is based on the processing of the stator line current [2Induction Motor Stator Faults Diagnosis by a Current Concordia Pattern Based Fuzzy Decision System

  15. Trustworthy Evaluation of a Safe Driver Machine Interface through Software-Implemented Fault Injection

    E-Print Network [OSTI]

    Firenze, Universit degli Studi di

    of the system under evaluation. Although guidelines and good practices exist and are often applied such guidelines and good practices in experimental evaluation, metrology principles can contribute in improving principles of metrology and good practices of fault injection. Trustfulness in results has been estimated

  16. Discrimination among mechanical fault types in induction motors using electrical measurements

    E-Print Network [OSTI]

    McFatter, Justin Robert

    2002-01-01T23:59:59.000Z

    signals are sufficient to warrant the use of multi-resolution analysis. The fault diagnosis system is tested using data taken from an 800 hp motor and a 3 hp motor. The method is successful in identifying residual distortion in the frequency range...

  17. Fault Diagnosis in Gas Turbine Engines using Fuzzy Dennice Gayme,Sunil Menon

    E-Print Network [OSTI]

    Gayme, Dennice

    Fault Diagnosis in Gas Turbine Engines using Fuzzy Logic* Dennice Gayme,Sunil Menon Honeywell, Emmanuel Nwadiogbu Honeywell Engines, Systems and Services 111 S . 34th Street, P.O. Box 52181 Phoenix, AZ 85034 dennice.gayme@honeywell.com charles.ball@honeyweIl.com sunil.menon@honeyweIl.com dalemukavetz

  18. A Fault-Tolerant Multiphase Permanent Magnet Generator for Marine Current Turbine Applications

    E-Print Network [OSTI]

    Boyer, Edmond

    A Fault-Tolerant Multiphase Permanent Magnet Generator for Marine Current Turbine Applications on offshore wind turbine systems. Marine current turbines are characterized by a very difficult access feature. This paper deals with the use of a PM multiphase marine current turbine generator. With this kind

  19. Synchronous Machine Faults Detection and Diagnosis for Electro-mechanical Actuators

    E-Print Network [OSTI]

    Boyer, Edmond

    Detection and Isolation system for permanent magnet synchronous machine (PMSM). Two main faults occurring for the machine control. To illustrate the method an application is made on an innovative 12-slots 10-poles PMSM that becomes more and more popular in aeronautics, and on a 9-slots 8-poles PMSM used in critical application

  20. Timed Fault Tree Models of the China Yongwen Railway Accident , Zhaoguang Peng2,

    E-Print Network [OSTI]

    Miller, Alice

    analysis (FMEA), fault tree analysis (FTA) [3], functional hazard analysis, and event tree analysis (ETA that involves applying a set of descriptors to a number of parameters. FMEA is an effective analytical tool used to examine possible failure modes and to eliminate potential failure during system designs [5]. FMEA

  1. Combining Functional Modelling and Qualitative Fault Propagation to Enable Failure Mode Analysis of

    E-Print Network [OSTI]

    Snooke, Neal

    of Software Systems Neal Snooke and Jonathan Bell 1 Abstract. Failure Modes and Effects Analysis (FMEA- ware, and qualitative fault propagation, enables automated Software FMEA (SFMEA). The result is a broad in extending FMEA into the soft- ware itself [3, 14, 6, 8] however there has been little progress in developing

  2. UNSUPERVISED CLUSTERING FOR FAULT DIAGNOSIS IN NUCLEAR POWER PLANT COMPONENTS

    E-Print Network [OSTI]

    Boyer, Edmond

    1 UNSUPERVISED CLUSTERING FOR FAULT DIAGNOSIS IN NUCLEAR POWER PLANT COMPONENTS Piero Baraldi1 of prototypical behaviors. Its performance is tested with respect to an artificial case study and then applied on transients originated by different faults in the pressurizer of a nuclear power reactor. Key Words: Fault

  3. On Distributed Fault-Tolerant Detection in Wireless Sensor Networks

    E-Print Network [OSTI]

    Huang, Yinlun

    On Distributed Fault-Tolerant Detection in Wireless Sensor Networks Xuanwen Luo, Student Member problems for distributed fault-tolerant detection in wireless sensor networks: 1) how to address both it possible to perform energy- efficient fault-tolerant detection in a wireless sensor network. Index Terms

  4. Outlier Detection Rules for Fault Detection in Solar Photovoltaic Arrays

    E-Print Network [OSTI]

    Lehman, Brad

    , MPPT of the PV inverters, high fault impedance, or degradation of solar cells [1]. Without proper fault Abstract-- Solar photovoltaic (PV) arrays are unique power sources that may have uncleared fault current when utilizing conventional overcurrent protection devices. To monitor the PV operation and detect

  5. A Parametric Spectral Estimator for Faults Detection in Induction Machines

    E-Print Network [OSTI]

    Boyer, Edmond

    since their frequency resolution is limited and additional post-processing algorithms are required of bearing faults. Index Terms--Induction machine, faults detection, bearing faults, stator current that avoids the use of extra sensors since the stator currents are usually available and inexpensive

  6. Ris-M-2311 AUTOMATIC FAULT TREE CONSTRUCTION WITH RIKKE

    E-Print Network [OSTI]

    Ris-M-2311 Vol. 2 AUTOMATIC FAULT TREE CONSTRUCTION WITH RIKKE A COMPENDIUM OF EXAMPLES. VOLUME 2. CONTROL AND SAFETY LOOPS. J.R. Taylor Abstract. This second volume describes the construction of fault In this volume, examples of HIKKE fault tree construction including loops are given. The principles involved were

  7. Statistical estimation of multiple faults in aircraft gas turbine engines

    E-Print Network [OSTI]

    Ray, Asok

    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

  8. Identifying Security Fault Reports via Text Mining Michael Gegick, 2

    E-Print Network [OSTI]

    Young, R. Michael

    Identifying Security Fault Reports via Text Mining 1 Michael Gegick, 2 Pete Rotella, 1 Tao Xie 1 contains fault reports (FRs) collected from various sources such as development teams, test teams, and end-users. Software or security engineers manually analyze the FRs to label the subset of FRs that are security fault

  9. Fault-tolerant Holonomic Quantum Computation in Surface Codes

    E-Print Network [OSTI]

    Yi-Cong Zheng; Todd A. Brun

    2015-02-04T23:59:59.000Z

    We show that universal holonomic quantum computation (HQC) can be achieved fault-tolerantly by adiabatically deforming the gapped stabilizer Hamiltonian of the surface code, where quantum information is encoded in the degenerate ground space of the system Hamiltonian. We explicitly propose procedures to perform each logical operation, including logical state initialization, logical state measurement, logical CNOT, state injection and distillation,etc. In particular, adiabatic braiding of different types of holes on the surface leads to a topologically protected, non-Abelian geometric logical CNOT. Throughout the computation, quantum information is protected from both small perturbations and low weight thermal excitations by a constant energy gap, and is independent of the system size. Also the Hamiltonian terms have weight at most four during the whole process. The effect of thermal error propagation is considered during the adiabatic code deformation. With the help of active error correction, this scheme is fault-tolerant, in the sense that the computation time can be arbitrarily long for large enough lattice size. It is shown that the frequency of error correction and the physical resources needed can be greatly reduced by the constant energy gap.

  10. Increasing fault resiliency in a message-passing environment.

    SciTech Connect (OSTI)

    Stearley, Jon R.; Riesen, Rolf E.; Laros, James H., III; Ferreira, Kurt Brian; Pedretti, Kevin Thomas Tauke; Oldfield, Ron A.; Kordenbrock, Todd (Hewlett-Packard Company); Brightwell, Ronald Brian

    2009-10-01T23:59:59.000Z

    Petaflops systems will have tens to hundreds of thousands of compute nodes which increases the likelihood of faults. Applications use checkpoint/restart to recover from these faults, but even under ideal conditions, applications running on more than 30,000 nodes will likely spend more than half of their total run time saving checkpoints, restarting, and redoing work that was lost. We created a library that performs redundant computations on additional nodes allocated to the application. An active node and its redundant partner form a node bundle which will only fail, and cause an application restart, when both nodes in the bundle fail. The goal of this library is to learn whether this can be done entirely at the user level, what requirements this library places on a Reliability, Availability, and Serviceability (RAS) system, and what its impact on performance and run time is. We find that our redundant MPI layer library imposes a relatively modest performance penalty for applications, but that it greatly reduces the number of applications interrupts. This reduction in interrupts leads to huge savings in restart and rework time. For large-scale applications the savings compensate for the performance loss and the additional nodes required for redundant computations.

  11. An algorithm for faulted phase and feeder selection under high impedance fault conditions

    E-Print Network [OSTI]

    Benner, Carl Lee

    1988-01-01T23:59:59.000Z

    . One method based on increases in third and fifth harmonic symmetrical current components under high impedance fault conditions has been proposed by Balser et. Journal model is IEEE Transactions on Power Delivery. al, of Power Technologies Inc [1...

  12. Realistic fault modeling and quality test generation of combined delay faults

    E-Print Network [OSTI]

    Thadhlani, Ajaykumar A

    2001-01-01T23:59:59.000Z

    coupled lines. To cope up with these realistic testing problems, it is necessary to model the circuit defects by considering the capacitively coupling between lines. This needs a better fault model which can incorporate the local defects (such...

  13. Case study of Chilled Water Loop Low Delta-T Fault Diagnosis

    E-Print Network [OSTI]

    Wang, L.; Meline, K.; Watt, J.

    2014-01-01T23:59:59.000Z

    verification, degraded performance ESL-IC-14-09-12 Proceedings of the 14th International Conference for Enhanced Building Operations, Beijing, China, September 14-17, 2014 ...Case Study of Chilled Water Loop Low DT Fault Diagnosis Presented by Lei Wang Ph.D. P.E. Energy Systems Laboratory, Texas A&M University System Sep. 15, 2014 Energy Systems Laboratory p. 1 ESL-IC-14-09-12a Proceedings of the 14th International...

  14. Clay fabric intensity in natural and artificial fault gouges: Implications for brittle fault zone processes and sedimentary

    E-Print Network [OSTI]

    Clay fabric intensity in natural and artificial fault gouges: Implications for brittle fault zone processes and sedimentary basin clay fabric evolution Samuel H. Haines,1 Ben A. van der Pluijm,1 Matt J intensity measurements using X-ray texture goniometry on 22 natural clay-rich fault gouges from low

  15. We develop a microprocessor design that tolerates hard faults, including fabrication defects and in-field faults,

    E-Print Network [OSTI]

    Sorin, Daniel J.

    1 Abstract We develop a microprocessor design that tolerates hard faults, including fabrication defects and in-field faults, by leveraging existing microprocessor redundancy. To do this, we must: detect FDUs with hard faults. In our reliable microprocessor design, we use DIVA dynamic verification

  16. Thermal anomaly near the Aigio fault, Gulf of Corinth, Greece, maybe due to convection below the fault

    E-Print Network [OSTI]

    Thermal anomaly near the Aigio fault, Gulf of Corinth, Greece, maybe due to convection below intersecting the active Aigio fault, Corinth Rift, Greece. The heat flow is 53 mW/m2 , indicating of Corinth, Greece, maybe due to convection below the fault, Geophys. Res. Lett., 34, L06314, doi:10

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

    SciTech Connect (OSTI)

    Not Available

    1988-04-01T23:59:59.000Z

    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.

  18. Topological solvability and index characterizations for a common DAE power system model

    E-Print Network [OSTI]

    Trenn, Stephan

    Topological solvability and index characterizations for a common DAE power system model Tjorben B. Gross1, Stephan Trenn2 and Andreas Wirsen3 Abstract-- For the widely-used power system model consist- ing of the generator swing equations and the power flow equa- tions resulting in a system

  19. Fault Tolerant CORBASpecification, OMG document: ptc/20000404

    E-Print Network [OSTI]

    Roma "La Sapienza", Universit di

    Fault Tolerant CORBASpecification, V1.0 OMG document: ptc/20000404 replaces draft adopted specification ptc/20000304 and submission document orbos/000119 This document is an OMG Final Adopted in the finalization phase. Comments on the content of this document are welcomed, and should be directed to issues

  20. Global Trajectory Planning for Fault Tolerant Manipulators

    E-Print Network [OSTI]

    . Khosla Department of Electrical and Computer Engineering and The Robotics Institute, Carnegie Mellon attribute of robot manipulators in a growing range of applications such as space missions, nuclear waste retrieval, and medical robot­ ics. This trend has spawned a research effort in fault toler­ ant robotics

  1. 54 MAY | 2012 Gearbox Fault Detection

    E-Print Network [OSTI]

    Kusiak, Andrew

    , research in fault identification and condition monitoring is war- ranted. In this study, detecting wind of a test wind turbine. The gearbox was retested at the Dynamometer Test Facility (DTF) at NREL. To retest the gearbox, the complete nacelle, and the drive train of the test wind turbine were installed at the DTF

  2. Fault-Tolerant Spanners: Better and Simpler

    E-Print Network [OSTI]

    Dinitz, Michael

    2011-01-01T23:59:59.000Z

    A natural requirement of many distributed structures is fault-tolerance: after some failures, whatever remains from the structure should still be effective for whatever remains from the network. In this paper we examine spanners of general graphs that are tolerant to vertex failures, and significantly improve their dependence on the number of faults $r$, for all stretch bounds. For stretch $k \\geq 3$ we design a simple transformation that converts every $k$-spanner construction with at most $f(n)$ edges into an $r$-fault-tolerant $k$-spanner construction with at most $O(r^3 \\log n) \\cdot f(2n/r)$ edges. Applying this to standard greedy spanner constructions gives $r$-fault tolerant $k$-spanners with $\\tilde O(r^{2} n^{1+\\frac{2}{k+1}})$ edges. The previous construction by Chechik, Langberg, Peleg, and Roddity [STOC 2009] depends similarly on $n$ but exponentially on $r$ (approximately like $k^r$). For the case $k=2$ and unit-length edges, an $O(r \\log n)$-approximation algorithm is known from recent work of D...

  3. 2009 fault tolerance for extreme-scale computing workshop, Albuquerque, NM - March 19-20, 2009.

    SciTech Connect (OSTI)

    Katz, D. S.; Daly, J.; DeBardeleben, N.; Elnozahy, M.; Kramer, B.; Lathrop, S.; Nystrom, N.; Milfeld, K.; Sanielevici, S.; Scott, S.; Votta, L.; Louisiana State Univ.; Center for Exceptional Computing; LANL; IBM; Univ. of Illinois; Shodor Foundation; Pittsburgh Supercomputer Center; Texas Advanced Computing Center; ORNL; Sun Microsystems

    2009-02-01T23:59:59.000Z

    This is a report on the third in a series of petascale workshops co-sponsored by Blue Waters and TeraGrid to address challenges and opportunities for making effective use of emerging extreme-scale computing. This workshop was held to discuss fault tolerance on large systems for running large, possibly long-running applications. The main point of the workshop was to have systems people, middleware people (including fault-tolerance experts), and applications people talk about the issues and figure out what needs to be done, mostly at the middleware and application levels, to run such applications on the emerging petascale systems, without having faults cause large numbers of application failures. The workshop found that there is considerable interest in fault tolerance, resilience, and reliability of high-performance computing (HPC) systems in general, at all levels of HPC. The only way to recover from faults is through the use of some redundancy, either in space or in time. Redundancy in time, in the form of writing checkpoints to disk and restarting at the most recent checkpoint after a fault that cause an application to crash/halt, is the most common tool used in applications today, but there are questions about how long this can continue to be a good solution as systems and memories grow faster than I/O bandwidth to disk. There is interest in both modifications to this, such as checkpoints to memory, partial checkpoints, and message logging, and alternative ideas, such as in-memory recovery using residues. We believe that systematic exploration of these ideas holds the most promise for the scientific applications community. Fault tolerance has been an issue of discussion in the HPC community for at least the past 10 years; but much like other issues, the community has managed to put off addressing it during this period. There is a growing recognition that as systems continue to grow to petascale and beyond, the field is approaching the point where we don't have any choice but to address this through R&D efforts.

  4. Probabilistic model of fault detection in quantum circuits

    E-Print Network [OSTI]

    Anindita Banerjee; Anirban Pathak

    2009-05-12T23:59:59.000Z

    It is shown that the fault testing for quantum circuits does not follow conventional classical techniques. If probabilistic gate like Hadamard gate is included in a circuit then the classical notion of test vector is shown to fail. We have reported several new and distinguishing features of quantum fault and also presented a general methodology for detection of functional faults in a quantum circuit. The technique can generate test vectors for detection of different kinds of fault. Specific examples are given and time complexity of the proposed quantum fault detection algorithm is reported.

  5. Faulting in the Yucca Mountain region: Critical review and analyses of tectonic data from the central Basin and Range

    SciTech Connect (OSTI)

    Ferrill, D.A.; Stirewalt, G.L.; Henderson, D.B.; Stamatakos, J.; Morris, A.P.; Spivey, K.H. [Southwest Research Inst., San Antonio, TX (United States). Center for Nuclear Waste Regulatory Analyses; Wernicke, B.P. [California Inst. of Tech., Pasadena, CA (United States). Div. of Geological and Planetary Sciences

    1996-03-01T23:59:59.000Z

    Yucca Mountain, Nevada, has been proposed as the potential site for a high-level waste (HLW) repository. The tectonic setting of Yucca Mountain presents several potential hazards for a proposed repository, such as potential for earthquake seismicity, fault disruption, basaltic volcanism, magma channeling along pre-existing faults, and faults and fractures that may serve as barriers or conduits for groundwater flow. Characterization of geologic structures and tectonic processes will be necessary to assess compliance with regulatory requirements for the proposed high level waste repository. In this report, we specifically investigate fault slip, seismicity, contemporary stain, and fault-slip potential in the Yucca Mountain region with regard to Key Technical Uncertainties outlined in the License Application Review Plan (Sections 3.2.1.5 through 3.2.1.9 and 3.2.2.8). These investigations center on (i) alternative methods of determining the slip history of the Bare Mountain Fault, (ii) cluster analysis of historic earthquakes, (iii) crustal strain determinations from Global Positioning System measurements, and (iv) three-dimensional slip-tendency analysis. The goal of this work is to assess uncertainties associated with neotectonic data sets critical to the Nuclear Regulatory Commission and the Center for Nuclear Waste Regulatory Analyses` ability to provide prelicensing guidance and perform license application review with respect to the proposed HLW repository at Yucca Mountain.

  6. Cooperative Fault Tolerant Distributed Computing

    SciTech Connect (OSTI)

    Fagg, Graham E.

    2006-03-15T23:59:59.000Z

    HARNESS was proposed as a system that combined the best of emerging technologies found in current distributed computing research and commercial products into a very flexible, dynamically adaptable framework that could be used by applications to allow them to evolve and better handle their execution environment. The HARNESS system was designed using the considerable experience from previous projects such as PVM, MPI, IceT and Cumulvs. As such, the system was designed to avoid any of the common problems found with using these current systems, such as no single point of failure, ability to survive machine, node and software failures. Additional features included improved inter-component connectivity, with full support for dynamic down loading of addition components at run-time thus reducing the stress on application developers to build in all the libraries they need in advance.

  7. Unconventional modelling of faulted reservoirs: a case study

    SciTech Connect (OSTI)

    Goldthorpe, W.H.; Chow, Y.S.

    1985-02-01T23:59:59.000Z

    An example is presented of detailed unconventional gridding of the North Rankin Field, which is a large, structurally complex gas-condensate field offshore Western Australia. A non-Cartesian areal grid was used with corner point geometry to approximate a generalized curvilinear coordinate system for the surface and interior of each reservoir unit. Coordinate lines in the vertical plane at any node in the grid were tilted where necessary to define sloping edges and sides of grid blocks. Thus, any sloping twisted surface could be modelled. To investigate possible communication across faults between different geological units, transmissibilities at faults were automatically calculated for any over-lapping cells and sensitivities made of the effect of varying these transmissibilities on well production, recovery factors, pressure decline and water encroachment. The model was solved with a fully implicit simulator using a Newton-Raphson iteration method for the non-linear equations and a variant of the Conjugate Gradient procedure with a preconditioning matrix for the linear equations.

  8. Buffered coscheduling for parallel programming and enhanced fault tolerance

    DOE Patents [OSTI]

    Petrini, Fabrizio (Los Alamos, NM); Feng, Wu-chun (Los Alamos, NM)

    2006-01-31T23:59:59.000Z

    A computer implemented method schedules processor jobs on a network of parallel machine processors or distributed system processors. Control information communications generated by each process performed by each processor during a defined time interval is accumulated in buffers, where adjacent time intervals are separated by strobe intervals for a global exchange of control information. A global exchange of the control information communications at the end of each defined time interval is performed during an intervening strobe interval so that each processor is informed by all of the other processors of the number of incoming jobs to be received by each processor in a subsequent time interval. The buffered coscheduling method of this invention also enhances the fault tolerance of a network of parallel machine processors or distributed system processors

  9. Fault Current Contribution from Single-Phase PV Inverters

    SciTech Connect (OSTI)

    Keller, J.; Kroposki, B.; Bravo, R.; Robles, S.

    2011-01-01T23:59:59.000Z

    A significant increase in photovoltaic (PV) system installations is expected to come on line in the near future and as the penetration level of PV increases, the effect of PV may no longer be considered minimal. One of the most important attributions of additional PV is what effect this may have on protection systems. Protection engineers design protection systems to safely eliminate faults from the electric power system. One of the new technologies recently introduced into the electric power system are distributed energy resources (DER). Currently, inverter-based DER contributes very little to the power balance on all but a few utility distribution systems. As DER become prevalent in the distribution system, equipment rating capability and coordination of protection systems merit a closer investigation. A collaborative research effort between the National Renewable Energy Laboratory (NREL) and Southern California Edison (SCE) involved laboratory short-circuit testing single-phase (240 VAC) residential type (between 1.5 and 7kW) inverters. This paper will reveal test results obtained from these short-circuit tests.

  10. automotive sampling system: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    analysis; automotive control system. I. INTRODUCTION In reliability Zachmann, Gabriel 47 System level Analysis of Fault Effect in an Automotive Environment...

  11. automotive quality systems: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    analysis; automotive control system. I. INTRODUCTION In reliability Zachmann, Gabriel 50 System level Analysis of Fault Effect in an Automotive Environment...

  12. 6.824 Distributed Computer Systems, Fall 2002

    E-Print Network [OSTI]

    Morris, Robert Tappan

    Abstractions and implementation techniques for design of distributed systems; server design, network programming, naming, storage systems, security, and fault tolerance. Readings from current literature. 6 Engineering ...

  13. Abstract--The FREEDM grid utilizes solid state transformers (SST) and solid state fault interruption devices (FID) which may

    E-Print Network [OSTI]

    Kimball, Jonathan W.

    bidirectional power flow between the system and the renewable energy sources. The system also includes solid of a Distribution Grid with Solid State Power Devices Karl Stefanski, Hengsi Qin, Badrul H. Chowdhury, Senior Member1 Abstract-- The FREEDM grid utilizes solid state transformers (SST) and solid state fault

  14. Stuck-at-fault test set compaction

    E-Print Network [OSTI]

    Vanfickell, Jason Michael

    2013-02-22T23:59:59.000Z

    of sltcp g(0. 5-ones~robo~, ~) Exc Bal, = 0. 25 ? of sites Figure 1. Formula for computation of the excitation balance Excitation balance is a metric computed for every detectable fault in the entire circuit. It is intended to provide a measure... Sigma ~ National Society of Collegiate Scholars Activities: ~ Texas A&M University Institute of Electrical and Electronic Engineers IT/Technology Chair and Webmaster, Fall 2003 ? Spring 2004 ~ Texas A&M University Student Engineers' Council...

  15. Pressure test data reveal reservoir barriers/faults

    SciTech Connect (OSTI)

    Hurd, J.D.

    1984-07-30T23:59:59.000Z

    A review of transient pressure test data from an oil reservoir in Libya indicated not only the suspected fault barriers, but also the non-sealing portions of the faults. Extensive seismic data indicated much faulting, and directional trends had been interpreted to be generally northwest-southeast. The reservoir is a heterogeneous dolomite with average permeability of 40 to 50 md and contains neither natural fractures not stratification. Vertical displacement (throw) of each fault block is indicated to be within the range of the dolomite thickness, i.e., 40 to 180 ft. Therefore, when the fault throw is greater than reservoir thickness there is sealing, and when the throw is less than reservoir thickness the faults are non-sealing.

  16. Fibre bundle framework for unitary quantum fault tolerance

    E-Print Network [OSTI]

    Daniel Gottesman; Lucy Liuxuan Zhang

    2013-09-26T23:59:59.000Z

    We introduce a differential geometric framework for describing families of quantum error-correcting codes and for understanding quantum fault tolerance. This work unifies the notion of topological fault tolerance with fault tolerance in other kinds of quantum error-correcting codes. In particular, we use fibre bundles with a natural flat projective connection to study the transformation of codewords under unitary fault-tolerant evolutions. We show that the fault-tolerant logical operations are given by the monodromy group for either of two bundles, both of which have flat projective connections. As concrete realizations of the general framework, we construct the bundles explicitly for two examples of fault-tolerant families of operations, the qudit transversal gates and the string operators in the toric code.

  17. Fault Intersection | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand JumpConceptual Model,DOEHazelPennsylvania: EnergyExolisFairway,FarmersFastcap SystemsShear

  18. Fault Mapping | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand JumpConceptual Model,DOEHazelPennsylvania: EnergyExolisFairway,FarmersFastcap SystemsShearMapping Jump

  19. Challenges in the Modeling and Quantitative Analysis of Safety-Critical Automotive Systems!

    E-Print Network [OSTI]

    Leue, Stefan

    ! Probabilistic FMEA! Probabilistic Analysis of System Architectures! ! Conclusion! 3! #12;ISO 26262: Road! ,,identify Failures"! - Qualitative FMEA! ! - Qualitative Fault Tree Analysis! ! - Event Tree Analysis! Quantitative Methods! ,,predict frequency of failures"! - Quantitative FMEA! ! - Quantitative Fault Tree

  20. A Turing Machine Resisting Isolated Bursts Of Faults

    E-Print Network [OSTI]

    Capuni, Ilir

    2012-01-01T23:59:59.000Z

    We consider computations of a Turing machine under noise that causes consecutive violations of the machine's transition function. Given a constant upper bound B on the size of bursts of faults, we construct a Turing machine M(B) subject to faults that can simulate any fault-free machine under the condition that bursts are not closer to each other than V for an appropriate V = O(B^2).