Sample records for dynamic var compensator

  1. Subsynchronous torsional interactions with static VAR compensators; Influence of HVDC

    SciTech Connect (OSTI)

    Rostamkolai, N.; Piwko, R.J.; Larsen, E.V. (General Electric Co., Schenectady, NY (USA)); Fisher, D.A. (New England Power Service Co., Westborough, MA (USA)); Mobarak, M.A. (New Brunswick Electric Power Commission, Fredericton, NB (Canada)); Poitras, A.E. (Maine Electric Power Co., Augusta, ME (US))

    1991-02-01T23:59:59.000Z

    Planning for installation of a static var compensator (SVC) in Chester, Maine, was initiated in 1987. The pre-specification subsynchronous torsional interaction (SSTI) studies showed the SVC might have a negative influence on stability of torsional modes of vibration of the nearby turbine-generators. In a previous paper, the parameters influencing the level of SSTI were identified with the use of a simple system. This paper extends the work to power systems containing an HVDC transmission system. The combined effect of SVC and HVDC on turbine-generator SSTI is investigated with the use of a hypothetical system. Simulation plots for the large machines of New Brunswick and Maine are included to quantify the level of interaction with the Chester SVC. Filtering as a mitigation measure is proposed to eliminate the small level of SSTI attributed to the Chester SVC.

  2. Capacitor-Less VAR Compensator Based on a Matrix Converter 

    E-Print Network [OSTI]

    Balakrishnan, Divya Rathna

    2012-02-14T23:59:59.000Z

    modes and wear-out mechanisms. Thus, they require constant monitoring and periodic replacement, which greatly increases the cost of traditional load compensation techniques. This thesis proposes a reactive power load compensator that uses inductors...

  3. advanced var compensators: Topics by E-print Network

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

    Power Filter With Power Transmission, Distribution and Plants Websites Summary: transformers scaled in the power of three. The filter can compensate load currents with a high...

  4. THE IMPACT OF GENERATION MIX ON PLACEMENT OF STATIC VAR COMPENSATORS

    E-Print Network [OSTI]

    THE IMPACT OF GENERATION MIX ON PLACEMENT OF STATIC VAR COMPENSATORS Robert H. Lasseter, Fellow to provide the maximum transfer capability for all possible generation mixes. The margin to low voltage limit bus system will be used to demonstrate this method over a wide range of generation patterns. Keywords

  5. THE IMPACT OF GENERATION MIX ON PLACEMENT OF STATIC VAR COMPENSATORS

    E-Print Network [OSTI]

    flexible and competitive. Due to the marketplace forces the generation mix could change day to dayTHE IMPACT OF GENERATION MIX ON PLACEMENT OF STATIC VAR COMPENSATORS Robert H. Lasseter, Fellow to provide maximum transfer capability for all possible generation mixes. The margin to low voltage limit

  6. Capacitor-Less VAR Compensator Based on a Matrix Converter

    E-Print Network [OSTI]

    Balakrishnan, Divya Rathna

    2012-02-14T23:59:59.000Z

    greatly contributed to the completion of this work. I owe my gratitude to them for always believing in me and helping me through my academic pursuit. vii NOMENCLATURE VAR Volt-ampere reactive MC 3-phase ac-to-3-phase ac matrix converter v1... [10] ...... 12 10 Equivalent circuit of a capacitor................................................................. 13 11 Basic layout of a 3/3 MC............................................................................ 16 12 Block diagram...

  7. Dynamic performance and control of a static var generator using cascade multilevel inverters

    SciTech Connect (OSTI)

    Peng, Fang Zheng [Tennessee Univ., Knoxville, TN (United States); Lai, Jih-Sheng [Oak Ridge National Lab., TN (United States)

    1996-10-01T23:59:59.000Z

    A cascade multilevel inverter is proposed for static VAR shifting, compensation/generation applications. The new cascade M-level inverter consists of (M-1)/2 single-phase full bridges in which each bridge has its own separate dc source. This inverter can generate almost sinusoidal waveform voltage with only one time switching per cycle. It can eliminate the need for transformers in multipulse inverters. A prototype static VAR generator (SVG) system using 11- level cascade inverter (21-level line-to-line voltage waveform) has been built. The output voltage waveform is equivalent to that of a 60- pulse inverter. This paper focuses on dynamic performance of the cascade inverter based SVG system. Control schemes are proposed to achieve a fast response which is impossible for a conventional static VAR compensator (SVC). Analytical, simulated and experimental results show the superiority of the proposed SVG system.

  8. Dynamic performance of static and synchronous compensators at an HVDC inverter bus in a very weak AC system

    SciTech Connect (OSTI)

    Nayak, O.B.; Gole, A.M. (Univ. of Manitoba, Winnipeg (Canada)); Chapman, D.G.; Davies, J.B. (Manitoba Hydro, Winnipeg (Canada))

    1994-08-01T23:59:59.000Z

    This paper discusses the performance of dynamic voltage control devices at the inverters of very weak ac systems. The types of compensation considered are: (a) static var compensator (SVC), (b) synchronous compensator (SC), (c) a mix of the two and (d) fixed capacitors. Although the primary purpose of these compensators is to control voltage at the ac bus, their dynamic performance during system disturbances is a very important factor. The investigation includes the behavior of the various voltage control options under ac and dc disturbances. The paper shows that the SVC has the fastest response for load rejection type of overvoltages, but can cause serious problems with recovery during undervoltages caused by single phase faults. The CIGRE benchmark model for HVdc control studies has been modified and used in this study. In particular the effect of local load has been included.

  9. STATIC VAR COMPENSATOR CONTROL USING A QUANTIZED CONTROLLER FOR A TWO AREA MULTI-MACHINE SYSTEM

    E-Print Network [OSTI]

    Wilamowski, Bogdan Maciej

    the reactive power supplied at a certain bus of an electric power system. It is an efficient and cost effective, a complex linearized mathematical model is needed for the power system. This summary includes Compensators (SVC) control to enhance the damping of the power-swing. The test system used is a two area multi

  10. Coherent-feedback quantum control with a dynamic compensator

    E-Print Network [OSTI]

    Hideo Mabuchi

    2008-03-13T23:59:59.000Z

    I present an experimental realization of a coherent-feedback control system that was recently proposed for testing basic principles of linear quantum stochastic control theory [M. R. James, H. I. Nurdin and I. R. Petersen, to appear in IEEE Transactions on Automatic Control (2008), arXiv:quant-ph/0703150v2]. For a dynamical plant consisting of an optical ring-resonator, I demonstrate ~ 7 dB broadband disturbance rejection of injected laser signals via all-optical feedback with a tailored dynamic compensator. Comparison of the results with a transfer function model pinpoints critical parameters that determine the coherent-feedback control system's performance.

  11. 130 IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 56, NO. 1, JANUARY 2009 Static Var Compensator and Active Power Filter With

    E-Print Network [OSTI]

    Catholic University of Chile (Universidad Católica de Chile)

    of this compensator, the dc link, instead of a capacitor, uses a battery pack, which is charged from a photovoltaic array connected to the batteries through a maximum power point tracker. This combined topology make, loads with inductances in excess of the re- quired value. In other words, neither voltage nor current

  12. Path tracking control of agricultural tractors with compensation for steering dynamics

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    Path tracking control of agricultural tractors with compensation for steering dynamics R. Eaton, H for path tracking control due to their generic and more simplistic nature when compared to dynamic models. However, control based solely on the kinematic model rarely takes into consideration any of the dynamics

  13. advanced static var: Topics by E-print Network

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

    energies Intermittent power: less predictable, less observable, less: Phase Shifting Transformers, Static Var Compensators Long distance HVAC underground cables with reactive...

  14. Adaptive all-order dispersion compensation of ultrafast laser pulses using dynamic spectral holography

    E-Print Network [OSTI]

    Nolte, David D.

    Adaptive all-order dispersion compensation of ultrafast laser pulses using dynamic spectral-1396 Received 14 July 1999; accepted for publication 24 September 1999 The time-varying dispersion of ultrafast laser pulses can be self-adaptively stabilized using real-time dynamic spectral holography

  15. ENERGY-BASED LIMIT CYCLE COMPENSATION FOR DYNAMICALLY BALANCING WHEELED INVERTED PENDULUM MACHINES

    E-Print Network [OSTI]

    Dollar, Aaron M.

    ENERGY-BASED LIMIT CYCLE COMPENSATION FOR DYNAMICALLY BALANCING WHEELED INVERTED PENDULUM MACHINES are not well known. The effects of these non-linearities can be observed in the energy behavior of IP balancing. While in this paper we use an energy-based observer to detect and correct limit cycles while balancing

  16. Puddle Dynamics and Air-to-Fuel Ratio Compensation for Gasoline-Ethanol Blends in

    E-Print Network [OSTI]

    Stefanopoulou, Anna

    1 Puddle Dynamics and Air-to-Fuel Ratio Compensation for Gasoline-Ethanol Blends in Flex-Fuel flexible fuel vehicles (FFVs) can operate on a blend of gasoline and ethanol in any concentration of up for gasoline-ethanol blends is, thus, necessary for the purpose of air-to-fuel ratio control. In this paper, we

  17. Reactive Power Compensator.

    DOE Patents [OSTI]

    El-Sharkawi, M.A.; Venkata, S.S.; Chen, M.; Andexler, G.; Huang, T.

    1992-07-28T23:59:59.000Z

    A system and method for determining and providing reactive power compensation for an inductive load. A reactive power compensator (50,50') monitors the voltage and current flowing through each of three distribution lines (52a, 52b, 52c), which are supplying three-phase power to one or more inductive loads. Using signals indicative of the current on each of these lines when the voltage waveform on the line crosses zero, the reactive power compensator determines a reactive power compensator capacitance that must be connected to the lines to maintain a desired VAR level, power factor, or line voltage. Alternatively, an operator can manually select a specific capacitance for connection to each line, or the capacitance can be selected based on a time schedule. The reactive power compensator produces control signals, which are coupled through optical fibers (102/106) to a switch driver (110, 110') to select specific compensation capacitors (112) for connections to each line. The switch driver develops triggering signals that are supplied to a plurality of series-connected solid state switches (350), which control charge current in one direction in respect to ground for each compensation capacitor. During each cycle, current flows from ground to charge the capacitors as the voltage on the line begins to go negative from its positive peak value. The triggering signals are applied to gate the solid state switches into a conducting state when the potential on the lines and on the capacitors reaches a negative peak value, thereby minimizing both the potential difference and across the charge current through the switches when they begin to conduct. Any harmonic distortion on the potential and current carried by the lines is filtered out from the current and potential signals used by the reactive power compensator so that it does not affect the determination of the required reactive compensation. 26 figs.

  18. Reactive power compensator

    DOE Patents [OSTI]

    El-Sharkawi, Mohamed A. (Renton, WA); Venkata, Subrahmanyam S. (Woodinville, WA); Chen, Mingliang (Kirkland, WA); Andexler, George (Everett, WA); Huang, Tony (Seattle, WA)

    1992-01-01T23:59:59.000Z

    A system and method for determining and providing reactive power compensation for an inductive load. A reactive power compensator (50,50') monitors the voltage and current flowing through each of three distribution lines (52a, 52b, 52c), which are supplying three-phase power to one or more inductive loads. Using signals indicative of the current on each of these lines when the voltage waveform on the line crosses zero, the reactive power compensator determines a reactive power compensator capacitance that must be connected to the lines to maintain a desired VAR level, power factor, or line voltage. Alternatively, an operator can manually select a specific capacitance for connection to each line, or the capacitance can be selected based on a time schedule. The reactive power compensator produces control signals, which are coupled through optical fibers (102/106) to a switch driver (110, 110') to select specific compensation capacitors (112) for connections to each line. The switch driver develops triggering signals that are supplied to a plurality of series-connected solid state switches (350), which control charge current in one direction in respect to ground for each compensation capacitor. During each cycle, current flows from ground to charge the capacitors as the voltage on the line begins to go negative from its positive peak value. The triggering signals are applied to gate the solid state switches into a conducting state when the potential on the lines and on the capacitors reaches a negative peak value, thereby minimizing both the potential difference and across the charge current through the switches when they begin to conduct. Any harmonic distortion on the potential and current carried by the lines is filtered out from the current and potential signals used by the reactive power compensator so that it does not affect the determination of the required reactive compensation.

  19. Analog and digital dynamic compensation techniques for delayed self-powered neutron detectors

    SciTech Connect (OSTI)

    Yusuf, S.O.; Wehe, D.K. (Univ. of Michigan, Dept. of Nuclear Engineering, Ann Arbor, MI (US))

    1990-12-01T23:59:59.000Z

    This paper reports on analog and digital methods developed to compensate for the time delay associated with rhodium self-powered neutron detector signals. This delay is caused by the decay of the neutron-activated rhodium and results in a current signal with unfavorable time response characteristics. The compensating analog method is based on the use of lead-lag networks to eliminate undesirable poles and zeros. The digital method takes digitized signals and numerically solves the inverse kinetics equation that relates reactor flux to the detector current at all earlier times. These methods were tested in a realistic reactor environment, and the results illustrate the accuracy achieved using each method.

  20. Abstract--This paper proposes an effective VAR planning based on reactive power margin for the enhancement of dynamic

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    , distributed generation (DG), D-STATCOM, reactive power margin, wind turbine. I. INTRODUCTION URRENTLY for the enhancement of dynamic voltage stability in distribution networks with distributed wind generation results showing the effects of composite load on voltage dynamics in the distribution network through

  1. Dynamic performance of a STATCON at an HVDC inverter feeding a very weak AC system

    SciTech Connect (OSTI)

    Zhuang, Y.; Menzies, R.W. [Univ. of Manitoba, Winnipeg, Manitoba (Canada)] [Univ. of Manitoba, Winnipeg, Manitoba (Canada); Nayak, O.B. [HVDC Research Centre, Winnipeg, Manitoba (Canada)] [HVDC Research Centre, Winnipeg, Manitoba (Canada); Turanli, H.M. [Manitoba Hydro, Winnipeg, Manitoba (Canada)] [Manitoba Hydro, Winnipeg, Manitoba (Canada)

    1996-04-01T23:59:59.000Z

    This paper investigates the dynamic performance of the advanced static var compensator or STATCON at a high voltage direct current (HVDC) converter terminal where the ac system has a very low short circuit ratio (SCR). The STATCON is based on a nine-level GTO thyristor inverter. The studies include operating characteristics of the STATCON under various ac and dc disturbances. The simulation results are compared with other types of reactive power compensation options available for such applications. It is shown that the STATCON has clear advantages over the other compensators, in areas such as; fault response time, voltage support ability, and dc recovery, while operating with very weak ac systems.

  2. Superconducting VAR control. [Patent application

    DOE Patents [OSTI]

    Boenig, H.J.; Hassenzahl, W.V.

    1980-12-05T23:59:59.000Z

    Static VAR control means are described employing an asymmetrically controlled Graetz bridge and a superconducting direct current coil having low losses and low cost characteristics.

  3. Robotic compensation of cerebellar ataxia

    E-Print Network [OSTI]

    Smith, Eric D., S.M. Massachusetts Institute of Technology

    2007-01-01T23:59:59.000Z

    The cerebellum is believed to play a role in dynamic compensation in the human motor control system. When it is damaged, subjects make clumsy movements with reduced acceleration, increased overshoot, and swerving in ...

  4. Study of static reactive power compensators for high-voltage power systems. Final report, May 12, 1981

    SciTech Connect (OSTI)

    Byerly, R.T.; Bennon, R.J.; Taylor, E.R. Jr.; Poznaniak, D.T.

    1981-05-12T23:59:59.000Z

    A general study of the application of static VAR compensators (SVC's) to high-voltage transmission systems has been performed. Considerable emphasis has been placed on improvements to synchronous stability, and it is shown that SVC's can provide significant benefits in terms of damping for unstable modes of oscillation and increases in transient stability limits. This report includes descriptions of static VAR compensators, technical and economic comparisons of different compensators, compensator models for system studies, comprehensive study procedures, study results for two small-scale systems, and guidelines for SVC application.

  5. Friction Problems in Servomechanisms: Modeling and Compensation Techniques

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    Friction Problems in Servomechanisms: Modeling and Compensation Techniques Jan Tommy Gravdahl of this presentation Introduction Friction models 1. Static models 2. Models with time delay 3. Dynamic models Friction compensation 1. Non-model based compensation 2. Compensation based on static friction models 3

  6. Static reactive power compensators for high-voltage power systems. Final report

    SciTech Connect (OSTI)

    Not Available

    1981-04-01T23:59:59.000Z

    A study conducted to summarize the role of static reactive power compensators for high voltage power system applications is described. This information should be useful to the utility system planning engineer in applying static var systems (SVS) to high voltage as (HVAC) systems. The static var system is defined as a form of reactive power compensator. The general need for reactive power compensation in HVAC systems is discussed, and the static var system is compared to other devices utilized to provide reactive power compensation. Examples are presented of applying SVS for specific functions, such as the prevention of voltage collapse. The operating principles of commercially available SVS's are discussed in detail. The perormance and active power loss characteristics of SVS types are compared.

  7. Reactive power compensating system

    DOE Patents [OSTI]

    Williams, Timothy J. (Redondo Beach, CA); El-Sharkawi, Mohamed A. (Renton, WA); Venkata, Subrahmanyam S. (Seattle, WA)

    1987-01-01T23:59:59.000Z

    The reactive power of an induction machine is compensated by providing fixed capacitors on each phase line for the minimum compensation required, sensing the current on one line at the time its voltage crosses zero to determine the actual compensation required for each phase, and selecting switched capacitors on each line to provide the balance of the compensation required.

  8. Power Factor Compensation (PFC) Power Factor Compensation

    E-Print Network [OSTI]

    Knobloch,Jürgen

    Power Factor Compensation (PFC) Power Factor Compensation The power factor (PF) is defined as the ratio between the active power and the apparent power of a system. If the current and voltage are periodic with period , and [ ), then the active power is defined by ( ) ( ) (their inner product

  9. New synchronous compensators for the Nelson River HVDC system; Planning requirements and specifications

    SciTech Connect (OSTI)

    Thio, C.V.; Davies, J.B. (Manitoba Hydro, Winnipeg, Manitoba (CA))

    1991-04-01T23:59:59.000Z

    The first units of Limestone Generating Station, the third plant on the Lower Nelson River in northern Manitoba, will come into service in the fall of 1990. Additional var compensation equipment is required at the inverter end of the Nelson River HVdc system to accommodate power from Limestone. This paper describes the system requirements of and the overall specification for the synchronous compensators selected to supply the reactive power and voltage support.

  10. Compensation Techniques in Accelerator Physics

    SciTech Connect (OSTI)

    Hisham Kamal Sayed

    2011-05-31T23:59:59.000Z

    Accelerator physics is one of the most diverse multidisciplinary fields of physics, wherein the dynamics of particle beams is studied. It takes more than the understanding of basic electromagnetic interactions to be able to predict the beam dynamics, and to be able to develop new techniques to produce, maintain, and deliver high quality beams for different applications. In this work, some basic theory regarding particle beam dynamics in accelerators will be presented. This basic theory, along with applying state of the art techniques in beam dynamics will be used in this dissertation to study and solve accelerator physics problems. Two problems involving compensation are studied in the context of the MEIC (Medium Energy Electron Ion Collider) project at Jefferson Laboratory. Several chromaticity (the energy dependence of the particle tune) compensation methods are evaluated numerically and deployed in a figure eight ring designed for the electrons in the collider. Furthermore, transverse coupling optics have been developed to compensate the coupling introduced by the spin rotators in the MEIC electron ring design.

  11. Abstract--The U.S. power industry is under great pressure to provide reactive power or Var support. Although it is generally

    E-Print Network [OSTI]

    Tolbert, Leon M.

    Abstract--The U.S. power industry is under great pressure to provide reactive power or Var support to provide local reactive power support, a thorough quantitative investigation of the economic benefit reactive power compensation. This paper investigates the benefits including reduced losses, shifting

  12. Reactive Power Compensating System.

    DOE Patents [OSTI]

    Williams, Timothy J.; El-Sharkawi, Mohamed A.; Venkata, Subrahmanyam S.

    1985-01-04T23:59:59.000Z

    The circuit was designed for the specific application of wind-driven induction generators. It has great potential for application in any situation where a varying reactive power load is present, such as with induction motors or generators, or for transmission network compensation.

  13. Regulatory constraints on executive compensation

    E-Print Network [OSTI]

    Joskow, Paul L.

    1993-01-01T23:59:59.000Z

    This paper explores the influence of economic regulation on the level and structure of executive compensation. We find substantial and persistent differences in CEO compensation between firms subject to economic regulation ...

  14. Energy Employees' Occupational Illness Compensation Program Act...

    Energy Savers [EERE]

    Employees' Occupational Illness Compensation Program Act (EEOICPA) Tracking Database, INL Energy Employees' Occupational Illness Compensation Program Energy Employees' Occupational...

  15. Compensational Gravity Fundamentals and an Application: The Cycling Universe

    E-Print Network [OSTI]

    Vladimir S. Mashkevich

    2010-04-16T23:59:59.000Z

    Compensational gravity, which is regarded as a fundamental theory, is an advanced version of semiclassical gravity. It is a construction which extends the Einstein equation. Along with the energy-momentum tensor, the extended Einstein equation includes the compensation tensor, or compenson. The latter compensates for the energy-momentum tensor insufficiency, which consists in the discontinuity in time (due to quantum state reduction) and in space (due to sharp cutoff), as well as in an anomaly (nonrealistic state equation and nonzero divergence). The compenson is a primary object, for which equations are formulated. Specifically, purely dark objects may or may not exist. The dynamics of compensational gravity gives rise naturally to the cosmological constant, or dark energy and to dark matter: The compenson versus particle dark matter. On the basis of the dynamics, a cycling model of the closed universe is constructed.

  16. aspergillus usamii var: Topics by E-print Network

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

    The artificial wetlands created through taro (Colocasia esculenta var. antiquorum) cultivation have played an important Reed, Michael 29 The development of RAPD and...

  17. Reactive-power compensation of coal mining excavators by using a new-generation STATCOM

    SciTech Connect (OSTI)

    Bilgin, H.F.; Ermis, M.; Kose, K.N.; Cadirci, I.; Acik, A.; Demirci, T.; Terciyanli, A.; Kocak, C.; Yorukoglu, M. [TUBITAK Information Technology & Electronic Research Institute, Ankara (Turkey)

    2007-01-15T23:59:59.000Z

    This paper deals with the development and implementation of a current-source-converter-based static synchronous compensator (CSC-STATCOM) applied to the volt-ampere-reactive (VAR) compensation problem of coal mining excavators. It is composed of a +/- 750-kVAR full-bridge CSC with selective harmonic elimination, a low-pass input filter tuned to 200 Hz, and a Delta/Y-connected coupling transformer for connection to medium-voltage load bus. Each power semiconductor switch is composed of an asymmetrical integrated gate commutated thyristor (IGCT) connected in series with a reverse-blocking diode and switched at 500 Hz to eliminate 5th, 7th, 11th, and 13th current harmonics produced by the CSC. Operating principles, power stage, design of dc link, and input filter are also described in this paper. It has been verified by field tests that the developed STATCOM follows rapid fluctuations in nearly symmetrical lagging and leading VAR consumption of electric excavators, resulting in nearly unity power factor on monthly basis, and the harmonic current spectra in the lines of CSC-STATCOM at the point of common coupling comply with the IEEE Standard 519-1992.

  18. Temperature compensated photovoltaic array

    DOE Patents [OSTI]

    Mosher, D.M.

    1997-11-18T23:59:59.000Z

    A temperature compensated photovoltaic module comprises a series of solar cells having a thermally activated switch connected in parallel with several of the cells. The photovoltaic module is adapted to charge conventional batteries having a temperature coefficient differing from the temperature coefficient of the module. The calibration temperatures of the switches are chosen whereby the colder the ambient temperature for the module, the more switches that are on and form a closed circuit to short the associated solar cells. By shorting some of the solar cells as the ambient temperature decreases, the battery being charged by the module is not excessively overcharged at lower temperatures. PV module is an integrated solution that is reliable and inexpensive. 2 figs.

  19. Temperature compensated photovoltaic array

    DOE Patents [OSTI]

    Mosher, Dan Michael (Plano, TX)

    1997-11-18T23:59:59.000Z

    A temperature compensated photovoltaic module (20) comprised of a series of solar cells (22) having a thermally activated switch (24) connected in parallel with several of the cells (22). The photovoltaic module (20) is adapted to charge conventional batteries having a temperature coefficient (TC) differing from the temperature coefficient (TC) of the module (20). The calibration temperatures of the switches (24) are chosen whereby the colder the ambient temperature for the module (20), the more switches that are on and form a closed circuit to short the associated solar cells (22). By shorting some of the solar cells (22) as the ambient temperature decreases, the battery being charged by the module (20) is not excessively overcharged at lower temperatures. PV module (20) is an integrated solution that is reliable and inexpensive.

  20. Compensated pulsed alternator

    DOE Patents [OSTI]

    Weldon, William F. (Austin, TX); Driga, Mircea D. (Austin, TX); Woodson, Herbert H. (Austin, TX)

    1980-01-01T23:59:59.000Z

    This invention relates to an electromechanical energy converter with inertial energy storage. The device, a single phase, two or multi-pole alternator with stationary field coils, and a rotating armature is provided. The rotor itself may be of laminated steel for slower pulses or for faster pulses should be nonmagnetic and electrically nonconductive in order to allow rapid penetration of the field as the armature coil rotates. The armature coil comprises a plurality of power generating conductors mounted on the rotor. The alternator may also include a stationary or counterrotating compensating coil to increase the output voltage thereof and to reduce the internal impedance of the alternator at the moment of peak outout. As the machine voltage rises sinusoidally, an external trigger switch is adapted to be closed at the appropriate time to create the desired output current from said alternator to an external load circuit, and as the output current passes through zero a self-commutating effect is provided to allow the switch to disconnect the generator from the external circuit.

  1. annuum var aviculare: Topics by E-print Network

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

    vapor pressure Teskey, Robert O. 7 | x Local var CiteSeer Summary: This document presents the proofs for the above 2012 CSF submission. 2 Language definition 2.1...

  2. Compensation for electrical converter nonlinearities

    DOE Patents [OSTI]

    Perisic, Milun; Ransom, Ray M; Kajouke, Lateef A

    2013-11-19T23:59:59.000Z

    Systems and methods are provided for delivering energy from an input interface to an output interface. An electrical system includes an input interface, an output interface, an energy conversion module between the input interface and the output interface, an inductive element between the input interface and the energy conversion module, and a control module. The control module determines a compensated duty cycle control value for operating the energy conversion module to produce a desired voltage at the output interface and operates the energy conversion module to deliver energy to the output interface with a duty cycle that is influenced by the compensated duty cycle control value. The compensated duty cycle control value is influenced by the current through the inductive element and accounts for voltage across the switching elements of the energy conversion module.

  3. Flow-Force Compensation in a Hydraulic Valve

    E-Print Network [OSTI]

    Lugowski, Jan

    2015-01-01T23:59:59.000Z

    Flow-reaction forces acting in hydraulic valves have been studied for many decades. Despite this, they are difficult to account for due to the complexities of the jet flow. This paper focuses only on the reduction, also referred to as compensation, of the flow force as applied to a valve spool featuring a profile of a turbine bucket. Fluid power textbooks explain the compensation taking place on such a profile by applying Newton laws of motion to the profile and deliver an equation for the magnitude and the direction of the flow force. This paper shows that both the magnitude and the direction of the compensating flow force are incorrect if calculated from the textbook equation. A corrected analysis of the dynamic forces is presented that are in agreement with earlier experiments by this author. It follows that the compensating flow force should be calculated from the static-pressure imbalance on the spool profile. That is, not Newton but Pascal law should be applied to calculate the compensating flow force.

  4. automatic tube compensation: Topics by E-print Network

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

    of lens compensators. Terebizh, V Yu 2014-01-01 51 Bird orientation: compensation for wind Environmental Sciences and Ecology Websites Summary: Bird orientation: compensation for...

  5. Bird orientation: compensation for wind

    E-Print Network [OSTI]

    Thorup, Kasper

    Bird orientation: compensation for wind drift in migrating raptors is age dependent Kasper Thorup1 14.04.03 Despite the potentially strong effect of wind on bird orientation, our understanding of how wind drift affects migrating birds is still very limited. Using data from satellite-based radio

  6. Perks and Culture Competitive compensation

    E-Print Network [OSTI]

    Ghosh, Joydeep

    utilities add a layer of digital intelligence to their grids. These smart grids use sensors, meters, digitalPerks and Culture · Competitive compensation · Merit raises and performance bonuses · 401(k) plan with company match and immediate vesting · Employee Stock Purchase Plan (ESPP) · Health coverage and wellness

  7. A Method for Evaluating Volt-VAR Optimization Field Demonstrations

    SciTech Connect (OSTI)

    Schneider, Kevin P.; Weaver, T. F.

    2014-08-31T23:59:59.000Z

    In a regulated business environment a utility must be able to validate that deployed technologies provide quantifiable benefits to the end-use customers. For traditional technologies there are well established procedures for determining what benefits will be derived from the deployment. But for many emerging technologies procedures for determining benefits are less clear and completely absent in some cases. Volt-VAR Optimization is a technology that is being deployed across the nation, but there are still numerous discussions about potential benefits and how they are achieved. This paper will present a method for the evaluation, and quantification of benefits, for field deployments of Volt-VAR Optimization technologies. In addition to the basic methodology, the paper will present a summary of results, and observations, from two separate Volt-VAR Optimization field evaluations using the proposed method.

  8. Bonded, walk-off compensated optical elements

    DOE Patents [OSTI]

    Ebbers, Christopher A. (Livermore, CA)

    2003-04-08T23:59:59.000Z

    A bonded, walk-off compensated crystal, for use with optical equipment, and methods of making optical components including same.

  9. Infection of Glycine max by Diaporthe phaseolorum var. sojae

    E-Print Network [OSTI]

    Pastor-Corrales, Marcial Antonio

    1977-01-01T23:59:59.000Z

    plant hy ~hia orth pha oloru var. ~so'ae, a d to investigate the effect of some fungicides on the pod and stem blight pathogen under field conditions. LITERATURE REVIEW The pod and stem blight disease of soybeans was first observed in a North... ae (~phomo sis ap. ). Fig. 2. Yertical section of a pycnidium of Dia rthe haseolorum var. ~so'aa (~phomo sis sp. ) shoming o oaiophoras an a p a ypa conidia. Fig. 3. Alpha co idia of ~hia orthe haseolorum uar. ~ao ae (~ohom si sp. f showl g two...

  10. Optimality of 4D-Var and its relationship with the Kalman lter and Kalman smoother

    E-Print Network [OSTI]

    Aluffi, Paolo

    Optimality of 4D-Var and its relationship with the Kalman #12;lter and Kalman smoother Zhijin Li-Var and the Kalman #12;lter as well as the #12;xed-interval Kalman smoother point to particular optimal properties irrespective of whether the model is perfect or not. Various properties of equivalence of 4D-Var to the Kalman

  11. Original article Residues in wax and honey after Apilife VAR®

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Original article Residues in wax and honey after Apilife VAR® treatment Stefan Bogdanov Anton and foundation were exposed to the air during storage. © Inra/DIB/AGIB/Elsevier, Paris honey / wax / residue to accumulation of these substances in beeswax and less so in honey [1, 17]. The accumulation in wax depends

  12. Compensation issues tough to navigate

    SciTech Connect (OSTI)

    Madison, Alison L.

    2012-02-12T23:59:59.000Z

    Monthly economic diversity column for the Tri-City Herald - excerpt pasted below: Most industries out there are feeling the shift to a more educated, thus more empowered consumer. The legal field is no exception, which is why it's no surprise that lawsuits are on the rise. Today's society is one in which people are more aware than ever of their rights, and often equally convinced of their entitlements in a number of areas. For business owners, employees represent a major source of potential lawsuits. And compensation is an area of particular concern given that many complaints against employers revolve around it in some way.

  13. Dispersion compensation for attosecond electron pulses

    SciTech Connect (OSTI)

    Hansen, Peter; Baumgarten, Cory; Batelaan, Herman; Centurion, Martin [Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588 (United States)

    2012-08-20T23:59:59.000Z

    We propose a device to compensate for the dispersion of attosecond electron pulses. The device uses only static electric and magnetic fields and therefore does not require synchronization to the pulsed electron source. Analogous to the well-known optical dispersion compensator, an electron dispersion compensator separates paths by energy in space. Magnetic fields are used as the dispersing element, while a Wien filter is used for compensation of the electron arrival times. We analyze a device with a size of centimeters, which can be applied to ultrafast electron diffraction and microscopy, and fundamental studies.

  14. ORO Energy Employees Occupational Illness Compensation Program...

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

    - Energy Employees Occupational Illness Compensation Program Act, Office of Legacy Management LM Records Handling System-Fernald Historical Records System, Office of Legacy...

  15. Log amplifier with pole-zero compensation

    DOE Patents [OSTI]

    Brookshier, W.

    1985-02-08T23:59:59.000Z

    A logarithmic amplifier circuit provides pole-zero compensation for improved stability and response time over 6-8 decades of input signal frequency. The amplifer circuit includes a first operational amplifier with a first feedback loop which includes a second, inverting operational amplifier in a second feedstock loop. The compensated output signal is provided by the second operational amplifier with the log elements, i.e., resistors, and the compensating capacitors in each of the feedback loops having equal values so that each break point is offset by a compensating break point or zero.

  16. Temperature compensation via cooperative stability in protein degradation

    E-Print Network [OSTI]

    Peng, Yuanyuan; Noman, Nasimul; Iba, Hitoshi

    2015-01-01T23:59:59.000Z

    Temperature compensation is a notable property of circadian oscillators that indicates the insensitivity of the oscillator system's period to temperature changes; the underlying mechanism, however, is still unclear. We investigated the influence of protein dimerization and cooperative stability in protein degradation on the temperature compensation ability of two oscillators. Here, cooperative stability means that high-order oligomers are more stable than their monomeric counterparts. The period of an oscillator is affected by the parameters of the dynamic system, which in turn are influenced by temperature. We adopted the Repressilator and the Atkinson oscillator to analyze the temperature sensitivity of their periods. Phase sensitivity analysis was employed to evaluate the period variations of different models induced by perturbations to the parameters. Furthermore, we used experimental data provided by other studies to determine the reasonable range of parameter temperature sensitivity. We then applied the...

  17. Position control of a servopneumatic system using fuzzy compensation

    E-Print Network [OSTI]

    Sathyanarayana, Sreenivas

    2000-01-01T23:59:59.000Z

    The position control of a servopneumatic system in the presence of stick-slip type of friction is investigated. A cost effective, model-free fuzzy compensation scheme is proposed. The fuzzy compensation scheme compensates for the friction force...

  18. Predictive Compensation for Communication Outages in Networked Control Systems

    E-Print Network [OSTI]

    Johansson, Karl Henrik

    Predictive Compensation for Communication Outages in Networked Control Systems Erik Henriksson Henrik Sandberg Karl Henrik Johansson Abstract-- A predictive outage compensator co time instance, the predictive outage compensator suggests a replacement command based on the history

  19. Position control of a servopneumatic system using fuzzy compensation 

    E-Print Network [OSTI]

    Sathyanarayana, Sreenivas

    2000-01-01T23:59:59.000Z

    The position control of a servopneumatic system in the presence of stick-slip type of friction is investigated. A cost effective, model-free fuzzy compensation scheme is proposed. The fuzzy compensation scheme compensates for the friction force...

  20. Policy Flash 2014-29 Acquisition Letter 07 - Benchmark Compensation...

    Office of Environmental Management (EM)

    Letter 07 - Benchmark Compensation Amount for Individual Executive Salary Actions Policy Flash 2014-29 Acquisition Letter 07 - Benchmark Compensation Amount for Individual...

  1. POLICY FLASH 2014-15 Determination of Benchmark Compensation...

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

    of Benchmark Compensation Amount for Certain Executives and Employees (Update) POLICY FLASH 2014-15 Determination of Benchmark Compensation Amount for Certain Executives...

  2. POLICY FLASH 2014-15 Determination of Benchmark Compensation...

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

    5 Determination of Benchmark Compensation Amount for Certain Executives and Employees POLICY FLASH 2014-15 Determination of Benchmark Compensation Amount for Certain Executives and...

  3. Public Comment re NOI on Convention on Supplementary Compensation...

    Energy Savers [EERE]

    NOI on Convention on Supplementary Compensation for Nuclear Damage Public Comment re NOI on Convention on Supplementary Compensation for Nuclear Damage ENERGYSOLUTIONS' Comment in...

  4. Public Comment re Convention on Supplementary Compensation for...

    Energy Savers [EERE]

    Convention on Supplementary Compensation for Nuclear Damage Contingent Cost Allocation Public Comment re Convention on Supplementary Compensation for Nuclear Damage Contingent Cost...

  5. Workers' Compensation Costs Rising Across the Nation | Department...

    Office of Environmental Management (EM)

    Workers' Compensation Costs Rising Across the Nation Workers' Compensation Costs Rising Across the Nation For the first time since 1992, benefits paid to workers and employers'...

  6. POLICY GUIDANCE MEMORANDUM #11A Approval Process for Dual Compensation...

    Office of Environmental Management (EM)

    1A Approval Process for Dual Compensation Waivers for Reemployed Annuitants POLICY GUIDANCE MEMORANDUM 11A Approval Process for Dual Compensation Waivers for Reemployed Annuitants...

  7. Servomechanism compensating parameters solved by digital computer 

    E-Print Network [OSTI]

    Scott, Eldon Duane

    1957-01-01T23:59:59.000Z

    and the speed of calculation. The results of the test problem are as follows'. G(s) s( . Ols + 1)( . 00035s + . 054s + 1) 35 radians jsec 100 radians jsec/radian error 90o ~Ct1 ~0* tt* Table of open-loop response Compensating factors Compensating...-lag cascade compensated system were checked by a test problem. The design specifications for this problem require that, at the design resonant frequency of 35 radians per second, the magnitude and angle of the closed- loop output-input ratio be 1, 5000...

  8. UCF Re-employment Compensation Process Background Information

    E-Print Network [OSTI]

    Wu, Shin-Tson

    1 UCF Re-employment Compensation Process Background Information: Re-employment compensation position. Re-employment compensation is a federal-state partnership based upon federal law but it is administered at the state level. Re-employment compensation is a temporary, partial wage replacement

  9. Stability of Single Particle Motion with Head-On Beam-Beam Compensation in the RHIC

    SciTech Connect (OSTI)

    Luo,Y.; Fischer, W.; Abreu, N.

    2008-05-01T23:59:59.000Z

    To compensate the large tune shift and tune spread generated by the head-on beam-beam interactions in the polarized proton run in the Relativistic Heavy Ion Collider (RHIC), we proposed a low energy electron beam with a Gaussian transverse profiles to collide head-on with the proton beam. In this article, with a weak-strong beam-beam interaction model, we investigate the stability of single particle motion in the presence of head-on beam-beam compensation. Tune footprints, tune diffusion, Lyapunov exponents, and 10{sup 6} turn dynamic apertures are calculated and compared between the cases without and with beam-beam compensation. A tune scan is performed and the possibility of increasing the bunch intensity is studied. The cause of tune footprint foldings is discussed, and the tune diffusion and Lyapunov exponent analysis are compared.

  10. UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE UNIVERSIT DU SUD TOULON / VAR

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE UNIVERSITÉ DU SUD ­ TOULON / VAR PROGRAMA DE PÓS Federal do Rio Grande do Norte em Co-tutela com o Institut Materiaux Microelectronique et Nanosciences de

  11. VaR Constrained Hedging of Fixed Price Load-Following Obligations in Competitive

    E-Print Network [OSTI]

    VaR Constrained Hedging of Fixed Price Load-Following Obligations in Competitive Electricity. In either case the entity holding the load following obligation is exposed to the load variation

  12. Endophyte Microbiome Diversity in Micropropagated Atriplex canescens and Atriplex torreyi var griffithsii

    E-Print Network [OSTI]

    Endophyte Microbiome Diversity in Micropropagated Atriplex canescens and Atriplex torreyi var to diverse fungal and bacterial taxa. Culturing isolated some seed borne endophyte taxa which could, Cooke P, Dowd S, Sun S (2011) Endophyte Microbiome Diversity in Micropropagated Atriplex canescens

  13. VarPetrRef 1 VARIETY AND THE EVOLUTION OF REFINERY PROCESSING

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    VarPetrRef 1 VARIETY AND THE EVOLUTION OF REFINERY PROCESSING Phuong NGUYEN*, Pier-Paolo SAVIOTTI, refinery processes, variety, niche theory, Weitzman measure. JEL classification : L15 -L93 -O3 1

  14. In situ magnetic compensation for potassium spin-exchange relaxation-free magnetometer considering probe beam pumping effect

    SciTech Connect (OSTI)

    Fang, Jiancheng; Wang, Tao, E-mail: wangtaowt@aspe.buaa.edu.cn; Quan, Wei; Yuan, Heng; Li, Yang [School of Instrument Science and Opto-Electronics Engineering, Beihang University, Beijing 100191 (China); Zhang, Hong; Zou, Sheng [School of Instrument Science and Engineering, Southeast University, Nanjing 210096 (China)

    2014-06-15T23:59:59.000Z

    A novel method to compensate the residual magnetic field for an atomic magnetometer consisting of two perpendicular beams of polarizations was demonstrated in this paper. The method can realize magnetic compensation in the case where the pumping rate of the probe beam cannot be ignored. In the experiment, the probe beam is always linearly polarized, whereas, the probe beam contains a residual circular component due to the imperfection of the polarizer, which leads to the pumping effect of the probe beam. A simulation of the probe beam's optical rotation and pumping rate was demonstrated. At the optimized points, the wavelength of the probe beam was optimized to achieve the largest optical rotation. Although, there is a small circular component in the linearly polarized probe beam, the pumping rate of the probe beam was non-negligible at the optimized wavelength which if ignored would lead to inaccuracies in the magnetic field compensation. Therefore, the dynamic equation of spin evolution was solved by considering the pumping effect of the probe beam. Based on the quasi-static solution, a novel magnetic compensation method was proposed, which contains two main steps: (1) the non-pumping compensation and (2) the sequence compensation with a very specific sequence. After these two main steps, a three-axis in situ magnetic compensation was achieved. The compensation method was suitable to design closed-loop spin-exchange relaxation-free magnetometer. By a combination of the magnetic compensation and the optimization, the magnetic field sensitivity was approximately 4 fT/Hz{sup 1/2}, which was mainly dominated by the noise of the magnetic shield.

  15. Laser focus compensating sensing and imaging device

    DOE Patents [OSTI]

    Vann, C.S.

    1993-08-31T23:59:59.000Z

    A laser focus compensating sensing and imaging device permits the focus of a single focal point of different frequency laser beams emanating from the same source point. In particular it allows the focusing of laser beam originating from the same laser device but having differing intensities so that a low intensity beam will not convert to a higher frequency when passing through a conversion crystal associated with the laser generating device. The laser focus compensating sensing and imaging device uses a Cassegrain system to fold the lower frequency, low intensity beam back upon itself so that it will focus at the same focal point as a high intensity beam. An angular tilt compensating lens is mounted about the secondary mirror of the Cassegrain system to assist in alignment. In addition cameras or CCD's are mounted with the primary mirror to sense the focused image. A convex lens is positioned co-axial with the Cassegrain system on the side of the primary mirror distal of the secondary for use in aligning a target with the laser beam. A first alternate embodiment includes a Cassegrain system using a series of shutters and an internally mounted dichroic mirror. A second alternate embodiment uses two laser focus compensating sensing and imaging devices for aligning a moving tool with a work piece.

  16. Servomechanism compensating parameters solved by digital computer

    E-Print Network [OSTI]

    Scott, Eldon Duane

    1957-01-01T23:59:59.000Z

    positive Ml M ? I 2 P O E Mp 2 Ma 1 POEIC E H MPROPEA COMPEMEAC ORp M Ma GCIJUJI ROMP Gc(JWI FIG 4 GEOMETRICAL PROPERTIES OF THE DESIGN SPECIFICATIONS AND THE COMPENSATED SERVOMECHANISM Mp ? lt JO ? kG / cc / / / Mp EEmk...

  17. Method for mask repair using defect compensation

    DOE Patents [OSTI]

    Sweeney, Donald W. (San Ramon, CA); Ray-Chaudhuri, Avijit K. (Livermore, CA)

    2001-01-01T23:59:59.000Z

    A method for repair of amplitude and/or phase defects in lithographic masks. The method involves modifying or altering a portion of the absorber pattern on the surface of the mask blank proximate to the mask defect to compensate for the local disturbance (amplitude or phase) of the optical field due to the defect.

  18. Effect of board independence on incentive compensation and compensation disclosure : evidence from Europe

    E-Print Network [OSTI]

    Muslu, Volkan

    2005-01-01T23:59:59.000Z

    My thesis examines how the lack of board-of-director independence affects the structure and disclosure of executive compensation. I find that European companies with more insiders on their boards grant their executives ...

  19. Secondary Control for Voltage Unbalance Compensation in an Islanded Microgrid

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    coupling (PCC). Unbalance compensation is achieved by proper control of distributed generators (DGs unbalance. Keywords-distributed generation; microgrid; secondary control; voltage unbalance compensation I. INTRODUCTION Distributed Generators (DGs) may be connected individually to the utility grid or be integrated

  20. An analysis of agricultural education faculty compensation systems

    E-Print Network [OSTI]

    Wicks, Aaron-Marie

    2002-01-01T23:59:59.000Z

    , and reward the best agricultural education faculty, research on this topic is needed to ensure faculty are compensated fairly and compensation systems are aligned with merit, motivation, performance, retention, environmental and financial needs of educators...

  1. Team Identity and Performance-based Compensation Effects on Performance 

    E-Print Network [OSTI]

    Blazovich, Janell L.

    2010-01-16T23:59:59.000Z

    This study investigates whether team members work harder and perform better when they are compensated based on both team and individual performance than when compensated based on team or individual performance alone and whether teammates...

  2. Selective compensation of voltage harmonics in grid-connected microgrids

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    1 Selective compensation of voltage harmonics in grid-connected microgrids Mehdi Savaghebia , Juan is proposed for selective compensation of main voltage harmonics in a grid- connected microgrid. The aim level. Keywords Distributed Generator (DG); microgrid; grid-connected; voltage harmonics compensation. 1

  3. The Inverse Kinetics Method and PID Compensation of the

    E-Print Network [OSTI]

    The Inverse Kinetics Method and PID Compensation of the Annular Core Research Reactor by Benjamin Kinetics Method and PID Compensation of the Annular Core Research Reactor by Benjamin Garnas ABSTRACT Kinetics Method and PID Compensation of the Annular Core Research Reactor by Benjamin Garnas B.S. General

  4. Self-Programmable PID Compensator for Digitally Controlled SMPS

    E-Print Network [OSTI]

    Prodiæ, Aleksandar

    Self-Programmable PID Compensator for Digitally Controlled SMPS Zhenyu Zhao and Aleksandar Prodi) that automatically adjusts parameters of PID compensator based on pre-specified bandwidth requirements. The PID at the corner frequency of the power stage. Then, the gain of the PID compensator is found from the oscillations

  5. Dynamic Computed Tomography, an algebraic reconstruction method with

    E-Print Network [OSTI]

    Promayon, Emmanuel

    Dynamic Computed Tomography, an algebraic reconstruction method with deformation compensation Sofia . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2 Computed Tomography . . . . . . . . . . . . . . . . . . . . . . 8 1.3 Dynamic Computed . . . . . . . . . . . . . . . . . . . . . 9 2 Basic tools for Computed Tomography 10 2.1 The Radon Transform

  6. Dynamic

    Office of Legacy Management (LM)

    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 742EnergyOn AprilA group currentBradleyTableSelling7111AWell: Gas productionDynamic , and Static ,

  7. Self-compensating tensiometer and method

    DOE Patents [OSTI]

    Hubbell, Joel M. (Idaho Falls, ID); Sisson, James B. (Idaho Falls, ID)

    2003-01-01T23:59:59.000Z

    A pressure self-compensating tensiometer and method to in situ determine below grade soil moisture potential of earthen soil independent of changes in the volume of water contained within the tensiometer chamber, comprising a body having first and second ends, a porous material defining the first body end, a liquid within the body, a transducer housing submerged in the liquid such that a transducer sensor within the housing is kept below the working fluid level in the tensiometer and in fluid contact with the liquid and the ambient atmosphere.

  8. Compensated gain control circuit for buck regulator command charge circuit

    DOE Patents [OSTI]

    Barrett, David M. (Albuquerque, NM)

    1996-01-01T23:59:59.000Z

    A buck regulator command charge circuit includes a compensated-gain control signal for compensating for changes in the component values in order to achieve optimal voltage regulation. The compensated-gain control circuit includes an automatic-gain control circuit for generating a variable-gain control signal. The automatic-gain control circuit is formed of a precision rectifier circuit, a filter network, an error amplifier, and an integrator circuit.

  9. Compensated gain control circuit for buck regulator command charge circuit

    DOE Patents [OSTI]

    Barrett, D.M.

    1996-11-05T23:59:59.000Z

    A buck regulator command charge circuit includes a compensated-gain control signal for compensating for changes in the component values in order to achieve optimal voltage regulation. The compensated-gain control circuit includes an automatic-gain control circuit for generating a variable-gain control signal. The automatic-gain control circuit is formed of a precision rectifier circuit, a filter network, an error amplifier, and an integrator circuit. 5 figs.

  10. Public comment re Convention on Supplementary Compensation on...

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

    the Nuclear Energy Institute (NEI) on Convention on Supplementary Compensation on Nuclear Damage Contingent Cost Allocation; Section 934 of the Energy Independence and Security Act...

  11. Public comment re Convention on Supplementary Compensation Contingent...

    Office of Environmental Management (EM)

    the funding obligations under the Convention on Supplementary Compensation for Nuclear Damage (CSC) and Section 934 of the Energy Independence and Security Act of 2007. American...

  12. DOE Notice of Inquiry on the Convention on Supplementary Compensation...

    Energy Savers [EERE]

    Inquiry on the Convention on Supplementary Compensation for Nuclear Damage (CSC) Contingent Cost Allocation - March 2, 2011 Meeting with CIGNL DOE Notice of Inquiry on the...

  13. Convention on Supplementary Compensation for Nuclear Damage Contingent...

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

    Allocation, Section 934 Convention on Supplementary Compensation for Nuclear Damage Contingent Cost Allocation, Section 934 LES comments in response to Notice of Inquiry on...

  14. SINGLE-PHOTON EMISSION COMPUTED TOMOGRAPHY: COMPENSATION FOR CONSTANT ATTENUATION

    E-Print Network [OSTI]

    Gullberg, Grant T.

    2013-01-01T23:59:59.000Z

    in radionuclide computed tomography," IEEE Trans. Nucl.49. M.E.Phelps, Emission computed tomography,~~ Seminars inSINGLE-PHOTON EMISSION COMPUTED TOMOGRAPHY: COMPENSATION FOR

  15. Horse and Libby dams. VarQ was made permanent at Libby and Hun-gry Horse dams by 2009, after an extensive Environmental

    E-Print Network [OSTI]

    VarQ Horse and Libby dams. VarQ was made permanent at Libby and Hun- gry Horse dams by 2009, afterQ providedecosystembenefitswhilemaintainingthesameFRMbenefits as under standard FRM. How Does VarQ Impact Canada? Above Libby Dam, both U of the border. Below Libby Dam, both U.S. and Canadian fish populations benefit from river flows that more

  16. Parameter monitoring compensation system and method

    DOE Patents [OSTI]

    Barkman, W.E.; Babelay, E.F.; DeMint, P.D.; Hebble, T.L.; Igou, R.E.; Williams, R.R.; Klages, E.J.; Rasnick, W.H.

    1995-02-07T23:59:59.000Z

    A compensation system is described for a computer-controlled machining apparatus having a controller and including a cutting tool and a workpiece holder which are movable relative to one another along a preprogrammed path during a machining operation. It utilizes sensors for gathering information at a preselected stage of a machining operation relating to an actual condition. The controller compares the actual condition to a condition which the program presumes to exist at the preselected stage and alters the program in accordance with detected variations between the actual condition and the assumed condition. Such conditions may be related to process parameters, such as a position, dimension or shape of the cutting tool or workpiece or an environmental temperature associated with the machining operation, and such sensors may be a contact or a non-contact type of sensor or a temperature transducer. 7 figs.

  17. Dispersion compensation in chirped pulse amplification systems

    DOE Patents [OSTI]

    Bayramian, Andrew James; Molander, William A.

    2014-07-15T23:59:59.000Z

    A chirped pulse amplification system includes a laser source providing an input laser pulse along an optical path. The input laser pulse is characterized by a first temporal duration. The system also includes a multi-pass pulse stretcher disposed along the optical path. The multi-pass pulse stretcher includes a first set of mirrors operable to receive input light in a first plane and output light in a second plane parallel to the first plane and a first diffraction grating. The pulse stretcher also includes a second set of mirrors operable to receive light diffracted from the first diffraction grating and a second diffraction grating. The pulse stretcher further includes a reflective element operable to reflect light diffracted from the second diffraction grating. The system further includes an amplifier, a pulse compressor, and a passive dispersion compensator disposed along the optical path.

  18. Compensated isocurvature perturbations in the curvaton model

    E-Print Network [OSTI]

    He, Chen; Hu, Wayne

    2015-01-01T23:59:59.000Z

    Primordial fluctuations in the relative number densities of particles, or isocurvature perturbations, are generally well constrained by cosmic microwave background (CMB) data. A less probed mode is the compensated isocurvature perturbation (CIP), a fluctuation in the relative number densities of cold dark matter and baryons. In the curvaton model, a sub-dominant field during inflation later sets the primordial curvature fluctuation $\\zeta$. In some curvaton-decay scenarios, the baryon and cold dark matter isocurvature fluctuations nearly cancel, leaving a large CIP correlated with $\\zeta$. This correlation can be used to probe these CIPs more sensitively than the uncorrelated CIPs considered in past work, essentially by measuring the squeezed bispectrum of the CMB for triangles whose shortest side is limited by the sound horizon. Here, the sensitivity of existing and future CMB experiments to correlated CIPs is assessed, with an eye towards testing specific curvaton-decay scenarios. The planned CMB Stage-4 ex...

  19. Stability Improvement of Wind Farms using Shunt and Series Compensation

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    Stability Improvement of Wind Farms using Shunt and Series Compensation T. F. Orchi, Student Member in stability improvement of wind farms. Static synchronous compensator (STATCOM) and static synchronous series enhance the performance of wind farms, however, they can be selected for a system depending on the system

  20. Fin Failure Compensation for an Unmanned Underwater Vehicle \\Lambda

    E-Print Network [OSTI]

    Leonard, Naomi

    Fin Failure Compensation for an Unmanned Underwater Vehicle \\Lambda Albert S.­F. Cheng and Naomi on a torpedo­shaped unmanned underwater vehicle (UUV) and design control laws to compensate for a fin that gets Island, is an unmanned underwater vehicle (UUV) representative of a class of UUV designed to have

  1. Reduced-Order Predictive Outage Compensators for Networked Systems

    E-Print Network [OSTI]

    Johansson, Karl Henrik

    Reduced-Order Predictive Outage Compensators for Networked Systems Erik Henriksson Henrik Sandberg communication outage of several samples in situations when the radio environment is noisy and low transmission power is desirable. We propose a method to compensate for outages by introducing a predictive outage

  2. Noise-compensating pulses for electrostatically controlled silicon spin qubits

    E-Print Network [OSTI]

    Xin Wang; Fernando A. Calderon-Vargas; Muhed S. Rana; Jason P. Kestner; Edwin Barnes; Sankar Das Sarma

    2014-10-21T23:59:59.000Z

    We study the performance of SUPCODE---a family of dynamically correcting pulses designed to cancel simultaneously both Overhauser and charge noise for singlet-triplet spin qubits---adapted to silicon devices with electrostatic control. We consider both natural Si and isotope-enriched Si systems, and in each case we investigate the behavior of individual gates under static noise and perform randomized benchmarking to obtain the average gate error under realistic 1/f noise. We find that in most cases SUPCODE pulses offer roughly an order of magnitude reduction in gate error, and especially in the case of isotope-enriched Si, SUPCODE yields gate operations of very high fidelity. We also develop a version of SUPCODE that cancels the charge noise only, "$\\delta J$-SUPCODE", which is particularly beneficial for isotope-enriched Si devices where charge noise dominates Overhauser noise, offering a level of error reduction comparable to the original SUPCODE while yielding gate times that are 30% to 50% shorter. Our results show that the SUPCODE noise-compensating pulses provide a fast, simple, and effective approach to error suppression, bringing gate errors well below the quantum error correction threshold in principle.

  3. M. Flierl: Adaptive Spatial Wavelets for Motion-Compensated Orthogonal Video Transforms, IEEE ICIP, Cairo, Egypt, Nov. 2009. 1 ADAPTIVE SPATIAL WAVELETS FOR MOTION-COMPENSATED

    E-Print Network [OSTI]

    Flierl, Markus

    , Cairo, Egypt, Nov. 2009. 1 ADAPTIVE SPATIAL WAVELETS FOR MOTION-COMPENSATED ORTHOGONAL VIDEO TRANSFORMS

  4. Forecasting Economic and Financial Variables with Global VARs

    E-Print Network [OSTI]

    Pesaran, M Hashem; Schuermann, Til; Smith, L Vanessa

    City, June 24-27, 2007 and at the Bank of England Research Workshop on Dynamic Factor Models held at the Bank of England, 8-10 October 2007. We are grateful for comments by the discussants James Stock and Domenico Giannone as well as to Frank Diebold... and Weiner, PSW, (2004), and further developed in Dees, di Mauro, Pesaran and Smith, DdPS, (2007), for answering some of these questions. We do so recognising that macroeconomic policy analysis and risk management need to take into account the increasing...

  5. Molecular and Genetic Analysis of Adaptive Evolution in the Rare Serpentine Endemic, Caulanthus amplexicaulis var. barbarae (J. Howell) Munz 

    E-Print Network [OSTI]

    Burrell, Anna Mildred

    2011-10-21T23:59:59.000Z

    In the interest of understanding the genetic basis of adaption to environment, we developed F2 lines from an F1 interspecific cross between the rare serpentine endemic, Caulanthus amplexicaulis var. barbarae and the ...

  6. Compensation for thermal effects in mirrors of Gravitational Wave Interferometers

    E-Print Network [OSTI]

    P. Hello

    2001-04-18T23:59:59.000Z

    In this paper we study several means of compensating for thermal lensing which, otherwise, should be a source of concern for future upgrades of interferometric detectors of gravitational waves. The methods we develop are based on the principle of heating the cold parts of the mirrors. We find that thermal compensation can help a lot but can not do miracles. It seems finally that the best strategy for future upgrades (``advanced configurations'') is maybe to use thermal compensation together with another substrate materials than Silica, for example Sapphire.

  7. Cutting tool form compensation system and method

    DOE Patents [OSTI]

    Barkman, W.E.; Babelay, E.F. Jr.; Klages, E.J.

    1993-10-19T23:59:59.000Z

    A compensation system for a computer-controlled machining apparatus having a controller and including a cutting tool and a workpiece holder which are movable relative to one another along a preprogrammed path during a machining operation utilizes a camera and a vision computer for gathering information at a preselected stage of a machining operation relating to the actual shape and size of the cutting edge of the cutting tool and for altering the preprogrammed path in accordance with detected variations between the actual size and shape of the cutting edge and an assumed size and shape of the cutting edge. The camera obtains an image of the cutting tool against a background so that the cutting tool and background possess contrasting light intensities, and the vision computer utilizes the contrasting light intensities of the image to locate points therein which correspond to points along the actual cutting edge. Following a series of computations involving the determining of a tool center from the points identified along the tool edge, the results of the computations are fed to the controller where the preprogrammed path is altered as aforedescribed. 9 figures.

  8. Adaptive dynamic inversion of nonlinear systems subjected to control saturation constraints

    E-Print Network [OSTI]

    Tandale, Monish Deepak

    2007-09-17T23:59:59.000Z

    The adaptive dynamic inversion control methodology uses dynamic inversion to calculate the control, and adaptation to compensate for the errors in the inversion due to model uncertainties. Traditionally, adaptive control assumes full authority...

  9. Optimal Inverter VAR Control in Distribution Systems with High PV Penetration

    E-Print Network [OSTI]

    Farivar, Masoud; Clarke, Christopher; Low, Steven

    2011-01-01T23:59:59.000Z

    The intent of the study detailed in this paper is to demonstrate the benefits of inverter var control on a fast timescale to mitigate rapid and large voltage fluctuations due to the high penetration of photovoltaic generation and the resulting reverse power flow. Our approach is to formulate the volt/var control as a radial optimal power flow (OPF) problem to minimize line losses and energy consumption, subject to constraints on voltage magnitudes. An efficient solution to the radial OPF problem is presented and used to study the structure of optimal inverter var injection and the net benefits, taking into account the additional cost of inverter losses when operating at non-unity power factor. This paper will illustrate how, depending on the circuit topology and its loading condition, the inverter's optimal reactive power injection is not necessarily monotone with respect to their real power output. The results are demonstrated on a distribution feeder on the Southern California Edison system that has a very ...

  10. Design and fabrication of pressure-compensating compliant tubes

    E-Print Network [OSTI]

    Martin, Ian (Ian P.)

    2014-01-01T23:59:59.000Z

    Different fabrication methods are evaluated for producing pressure-compensating tubes for use in low-pressure drip irrigation systems. Such devices would allow drip irrigation systems to operate at driving pressures much ...

  11. Team Identity and Performance-based Compensation Effects on Performance

    E-Print Network [OSTI]

    Blazovich, Janell L.

    2010-01-16T23:59:59.000Z

    ). Results indicate that while the combination of team and individual performance-based compensation results in the highest performance, the incremental performance boost is higher from the first performance-based reward strategy, regardless of whether...

  12. Perks and Culture Sign on bonus and competitive compensation

    E-Print Network [OSTI]

    Ghosh, Joydeep

    Perks and Culture · Sign on bonus and competitive compensation · Relocation packages, and housing and transportation stipend · Tuition reimbursement and training · Merit raises and performance bonuses · Health) · Employee referral bonus · Community involvement and sustainability/green initiatives · Creative and casual

  13. Analysis, Dimensioning and Robust Control of Shunt Active Filter for Harmonic Currents Compensation in Electrical Mains

    E-Print Network [OSTI]

    Tilli, Andrea; Conficoni, Christian

    2011-01-01T23:59:59.000Z

    In this chapter some results related to Shunt Active Filters (SAFs) and obtained by the authors and some coauthors are reported. SAFs are complex power electronics equipments adopted to compensate for cur-rent harmonic pollution in electric mains, due to nonlinear loads. By using a proper "floating" capacitor as energy reservoir, the SAF purpose is to inject in the line grid currents canceling the polluting har-monics. Control algorithms play a key role for such devices and, in general, in many power electronics applications. Moreover, systems theory is crucial, since it is the mathematical tool that enables a deep understanding of the involved dynamics of such systems, allowing a correct dimensioning, beside an effective control. As a matter of facts, current injection objective can be straightforwardly formulated as an output tracking control problem. In this fashion, the structural and insidious marginally-stable internal/zero dynamics of SAFs can be immediately highlighted and characterized in terms of si...

  14. Ecological compensation and Environmental Impact Assessment in Spain

    SciTech Connect (OSTI)

    Villarroya, Ana, E-mail: avillarroya@alumni.unav.e [Department of Zoology and Ecology, University of Navarra, Pamplona (Navarra) (Spain); Puig, Jordi, E-mail: jpbaguer@unav.e [Department of Zoology and Ecology, University of Navarra, Pamplona (Navarra) (Spain)

    2010-11-15T23:59:59.000Z

    To achieve meaningful sustainable development, Environmental Impact Assessment (EIA) should avoid the net losses in the environment resource base. But EIA practice does not always avoid the losses caused by the implementation of the projects under EIA regulation. Some environmental impacts are, simply, admitted, even without enforcing any form of compensation. When applied, compensation is sometimes just a monetary payment to offset the environmental loss. This paper looks for evidence on the role that compensation is given at present in EIA practice in Spain, and for some of its conceptual and regulatory roots. Specifically, it explores how compensation is addressed in 1302 records of decision (RODs) on those projects subject to the Spanish EIA regulation published during the years 2006 and 2007, to know how far Spain is from preserving the environmental resource base managed through this particular aspect of EIA practice. As a result, it is concluded that the practice of ecological compensation in EIA in Spain is much lower than it could be expected in a theoretical sustainability context committed to avoid net losses in the environment resource base, mainly due to an EIA practice focused on on-site mitigation that allows these net losses.

  15. Optical caliper with compensation for specimen deflection and method

    DOE Patents [OSTI]

    Bernacki, B.E.

    1997-12-09T23:59:59.000Z

    An optical non-contact profilometry system and method provided by an optical caliper with matched optical sensors that are arranged conjugate to each other so that the surface profile and thickness of an article can be measured without using a fixed reference surface and while permitting the article to deflect in space within the acquisition range of the optical sensors. The output signals from the two optical sensors are algebraically added to compensate for any such deflection of the article and provide a so compensated signal, the balance and sign of which provides a measurement of the actual thickness of the article at the optical sensors. 2 figs.

  16. Optical caliper with compensation for specimen deflection and method

    DOE Patents [OSTI]

    Bernacki, Bruce E. (Knoxville, TN)

    1997-01-01T23:59:59.000Z

    An optical non-contact profilometry system and method provided by an optical caliper with matched optical sensors that are arranged conjugate to each other so that the surface profile and thickness of an article can be measured without using a fixed reference surface and while permitting the article to deflect in space within the acquisition range of the optical sensors. The output signals from the two optical sensors are algebraically added to compensate for any such deflection of the article and provide a so compensated signal, the balance and sign of which provides a measurement of the actual thickness of the article at the optical sensors.

  17. PVT Compensation for Wilkinson Single-Slope Measurement Systems

    SciTech Connect (OSTI)

    Britton Jr, Charles L [ORNL; Ericson, Milton Nance [ORNL; Blalock, Benjamin [University of Tennessee, Knoxville (UTK); Tham, Kevin [Intel Corporation; Ulaganathan, Chandradevi [University of Tennessee, Knoxville (UTK); Greenwell, Robert E [ORNL; Holleman, Jeremy [University of Tennessee, Knoxville (UTK)

    2012-01-01T23:59:59.000Z

    A pulse-width locked loop (PWLL) circuit is reported that compensates for process, voltage, and temperature (PVT) variations of a linear ramp generator within a 12-bit multi-channel Wilkinson (single-slope integrating) Analog-to-Digital (ADC). This PWLL was designed and fabricated in a 0.5- m Silicon Germanium (SiGe) BiCMOS process. Simulation and silicon measurement data are shown that demonstrate a large improvement in the accuracy of the PVT-compensated ADC over the uncompensated ADC.

  18. TIME OF FLIGHT MOTION COMPENSATION REVISITED J.M. Gottfried

    E-Print Network [OSTI]

    Garbe, Christoph S.

    is a mature technology, used in industrial applications like optical inspection, robot control for compensation of such errors have been proposed to date, but still lack a proper comparison. We bridge this gap of a light source modulated with the reference. This is done by sampling the correlation function between

  19. Stiffness modeling of robotic manipulator with gravity compensator

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    to the stiffness modeling of a heavy industrial robot of the Kuka family. Key words: Stiffness modeling, gravity compensator, industrial robot. 1 Introduction Recently, in aerospace industry much attention is paid these requirements, industrial robots are more and more used to replace conventional CNC-machines, which are limited

  20. Compact adaptive optical compensation systems using continuous silicon deformable mirrors

    E-Print Network [OSTI]

    systems, laser machining systems, and laser communication systems. Perhaps the biggest manufacturing Micromachines Corporation, Watertown, MA 4 Manufacturing Engineering, Boston University, Boston MA ABSTRACT was used to compensate for static aberrations in an optical system. The MEMS DM, manufactured by Boston

  1. KALMAN FILTER WITH PHASE SPECTRUM COMPENSATION ALGORITHM FOR SPEECH ENHANCEMENT

    E-Print Network [OSTI]

    KALMAN FILTER WITH PHASE SPECTRUM COMPENSATION ALGORITHM FOR SPEECH ENHANCEMENT Stephen So, Kamil K.lyons, a.stark, k.paliwal}@griffith.edu.au ABSTRACT In this paper, we propose to combine the Kalman filter specifically, we apply the PSC tech- nique to initialise the Kalman filter, whereby PSC is used to clean

  2. Process Compensated CMOS Temperature Sensor for Microprocessor Application

    E-Print Network [OSTI]

    Ayazi, Farrokh

    Process Compensated CMOS Temperature Sensor for Microprocessor Application Yaesuk Jeong and Farrokh consumption is 478uW. I. INTRODUCTION With microprocessors scaling to higher performance and faster speed in the microprocessor to monitor its thermal distribution. Many CMOS based temperature sensors have been reported

  3. A new blowdown compensation scheme for boiler leak detection

    E-Print Network [OSTI]

    Marquez, Horacio J.

    considers the blowdown effect in industrial boiler operation. This adds to the efficiency of recent advancesA new blowdown compensation scheme for boiler leak detection A. M. Pertew ,1 X. Sun ,1 R. Kent in identification-based leak detection techniques of boiler steam- water systems. Keywords: Industrial Boilers, Tube

  4. The Composition of Compensation Policy: From Cash to Fringe Benefits

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    in the design of incentives by employers. However, this issue has been surprisingly left aside of economic composition of the compensation policy with both monetary and nonmonetary incentives. We characterize over monetary and nonmonetary benefits is common knowledge to both parties, nonmonetary incentives

  5. Hierarchical Control Scheme for Voltage Unbalance Compensation in Islanded Microgrids

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    Hierarchical Control Scheme for Voltage Unbalance Compensation in Islanded Microgrids Mehdi@et.aau.dk Abstract-- The concept of microgrid hierarchical control is presented, recently. In this paper, a hierarchical scheme which includes primary and secondary control levels is proposed for islanded microgrids

  6. JITTER COMPENSATION IN SAMPLING VIA POLYNOMIAL LEAST SQUARES ESTIMATION

    E-Print Network [OSTI]

    Goyal, Vivek K

    JITTER COMPENSATION IN SAMPLING VIA POLYNOMIAL LEAST SQUARES ESTIMATION Daniel S. Weller and Vivek Science Email: {dweller, vgoyal}@mit.edu ABSTRACT Sampling error due to jitter, or noise in the sample independent jitter and additive noise, as an alternative to the linear least squares (LLS) estimator. After

  7. Kinetic Model for Motion Compensation in Computed Tomography

    E-Print Network [OSTI]

    1 Kinetic Model for Motion Compensation in Computed Tomography Zhou Yu, Jean-Baptiste Thibault- gorithms have recently been applied to computed tomography and demonstrated superior image quality. MBIR to computed tomography and demonstrated superior image quality performance [1], [2], [3]. These methods

  8. accident compensation insurance: Topics by E-print Network

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

    accident compensation insurance First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Group Accident...

  9. COLUMBIA UNIVERSITY Departmental Accident Report Form for Worker's Compensation Benefits

    E-Print Network [OSTI]

    Jia, Songtao

    COLUMBIA UNIVERSITY Departmental Accident Report Form for Worker's Compensation Benefits EMPLOYEE___________ ACCIDENT DATA (to be completed by employee) Date of Injury_____/_____/____ Time of Injury the employee How did the injury or illness occur? (Describe fully the events that caused the accident) Describe

  10. Interline photovoltaic (I-PV) power plants for voltage unbalance compensation

    E-Print Network [OSTI]

    Moawwad, Ahmed

    This paper proposes a stationary-frame control method for voltage unbalance compensation using Interline Photovoltaic (I-PV) power system. I-PV power systems are controlled to compensate voltage unbalance autonomously. The ...

  11. Accounting earnings and chief executive officer compensation: the joint effect of earnings' contracting and valuation roles

    E-Print Network [OSTI]

    Cao, Ying

    2009-05-15T23:59:59.000Z

    This paper investigates the impact of accounting earnings on Chief Executive Officer (CEO) compensation by examining how the valuation role and the contracting role of accounting earnings jointly determine the value of CEO total compensation...

  12. Influence des conditions de conservation des bulbes d'chalote (Allium cepa L. var. aggregatum) sur leur

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Influence des conditions de conservation des bulbes d'échalote (Allium cepa L. var. aggregatum) sur leur levée Joseph COHAT LN.R.A., Station d'Amélioration de la Pomme de terre & des Plantes à bulbes, F 29207 Landerneau RÉSUMÉ Les bulbes d'échalote de Jersey (type demi-longue) sont dormants au moment de la

  13. BLIND COMPENSATION OF NONLINEAR DISTORTIONS VIA SPARSITY RECOVERY Leonardo T. Duarte1

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    BLIND COMPENSATION OF NONLINEAR DISTORTIONS VIA SPARSITY RECOVERY Leonardo T. Duarte1 , Ricardo.jutten@gipsa-lab.grenoble-inp.fr ABSTRACT In this work, we address the problem of compensating a non- linear memoryless system in a blind a representative set of experiments on synthetic data. Index Terms-- Blind compensation, nonlinear distortion

  14. A LINEARIZATION METHOD FOR A UWB VCO-BASED CHIRP GENERATOR USING DUAL COMPENSATION

    E-Print Network [OSTI]

    Gomez-Garcia Alvestegui, Daniel

    2011-12-31T23:59:59.000Z

    79 Figure 3-23: Simulated Bode Plots for Compensated Open Loop Transfer Function for Final Loop Filter Design (KV=600MHz/V) .................................................................................... 80 Figure 3-24: Simulated Bode Plots... for Compensated Open Loop Transfer Function for Final Loop Filter Design (KV=450MHz/V) .................................................................................... 80 Figure 3-25: Simulated Bode Plots for Compensated Open Loop Transfer Function for Final...

  15. Ecological compensation: From general guidance and expertise to specific proposals for road developments

    SciTech Connect (OSTI)

    Villarroya, Ana, E-mail: avillarroya@alumni.unav.es [Department of Zoology and Ecology, University of Navarra, c/Irunlarrea s/n, 31008 Pamplona, Navarra (Spain)] [Department of Zoology and Ecology, University of Navarra, c/Irunlarrea s/n, 31008 Pamplona, Navarra (Spain); Persson, Jesper, E-mail: jesper.persson@slu.se [Department of Landscape Management, Design and Construction, Swedish University of Agricultural Sciences (SLU), P.O. Box 66, SE-230 53 Alnarp (Sweden)] [Department of Landscape Management, Design and Construction, Swedish University of Agricultural Sciences (SLU), P.O. Box 66, SE-230 53 Alnarp (Sweden); Puig, Jordi, E-mail: jpbaguer@unav.es [Department of Zoology and Ecology, University of Navarra, c/Irunlarrea s/n, 31008 Pamplona, Navarra (Spain)] [Department of Zoology and Ecology, University of Navarra, c/Irunlarrea s/n, 31008 Pamplona, Navarra (Spain)

    2014-02-15T23:59:59.000Z

    The main scientific bibliography addressing the rationale behind ecological compensation is reviewed in order to examine general guidelines. This contains interesting general guidance on how to implement compensation, and provides the basis for future developments in compensation practice. On this basis, we propose a further step in compensation practice, advancing compensation proposals or rules for specific kinds of projects and contexts, focusing on road projects in the Spanish Environmental Impact Assessment (EIA). Three main residual impacts of roads are identified which usually remain uncompensated for: the loss of natural and semi-natural land use, the increase in emissions resulting from any new road, and the fragmentation, severance or barrier effect on the landscape and its wildlife. To counteract these, four proposals, or “rules”, are advanced: conservation of natural and semi-natural land use area, conservation of dominant plant species physiognomy, compensation for emissions, and the rule of positive defragmentation. -- Highlights: • Ecological compensation theory does not specify guidelines for types of projects. • EIA practitioners lack valuable specific guidance on how to implement compensation. • Specific guidance for road project ecological compensation is proposed. • Compensation proposals should have in mind present-day compensation practice level. • Specific ways to compensate for habitat loss, emissions, and fragmentation are shown.

  16. Systems and methods for compensating for electrical converter nonlinearities

    DOE Patents [OSTI]

    Perisic, Milun; Ransom, Ray M.; Kajouke, Lateef A.

    2013-06-18T23:59:59.000Z

    Systems and methods are provided for delivering energy from an input interface to an output interface. An electrical system includes an input interface, an output interface, an energy conversion module coupled between the input interface and the output interface, and a control module. The control module determines a duty cycle control value for operating the energy conversion module to produce a desired voltage at the output interface. The control module determines an input power error at the input interface and adjusts the duty cycle control value in a manner that is influenced by the input power error, resulting in a compensated duty cycle control value. The control module operates switching elements of the energy conversion module to deliver energy to the output interface with a duty cycle that is influenced by the compensated duty cycle control value.

  17. School of Electrical, Computer and Energy Engineering PhD Final Oral Defense

    E-Print Network [OSTI]

    Zhang, Junshan

    are addressed, including static VAr compensators (SVCs), high voltage dc (HVDC) transmission lines, and phase

  18. Temperature compensated current sensor using reference magnetic field

    DOE Patents [OSTI]

    Yakymyshyn, Christopher Paul (Seminole, FL); Brubaker, Michael Allen (Loveland, CO); Yakymyshyn, Pamela Jane (Seminole, FL)

    2007-10-09T23:59:59.000Z

    A method is described to provide temperature compensation and self-calibration of a current sensor based on a plurality of magnetic field sensors positioned around a current carrying conductor. A reference magnetic field generated within the current sensor housing is detected by a separate but identical magnetic field sensor and is used to correct variations in the output signal due to temperature variations and aging.

  19. Comprehensive Environmental Response, Compensation, and Liability Act Requirements

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    1989-10-06T23:59:59.000Z

    To establish and implement Department of Energy (DOE) Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) policies and procedures as prescribed by the National Oil and Hazardous Substance Pollution Contingency Plan (NCP) and under the authorities of Executive Order 12580 within the framework of the environmental programs established under doe 5400.1. Cancels DOE O 5480.14, DOE N 5400.4 and DOE N 5400.5. Canceled by DOE N 251.6.

  20. Matrix Effects in Biological Mass Spectrometry Imaging: Identification and Compensation

    SciTech Connect (OSTI)

    Lanekoff, Ingela T.; Stevens, Susan; Stenzel-Poore, Mary; Laskin, Julia

    2014-07-21T23:59:59.000Z

    Matrix effects in mass spectrometry imaging (MSI) may affect the observed molecular distribution in chemical and biological systems. In this study, we introduce an experimental approach that efficiently compensates for matrix effects in nanospray desorption electrospray ionization (nano-DESI) MSI without introducing any complexity into the experimental protocol. We demonstrate compensation for matrix effects in nano-DESI MSI of phosphatidylcholine (PC) in normal and ischemic mouse brain tissue by doping the nano-DESI solvent with PC standards. Specifically, we use mouse brain tissue of a middle cerebral artery occlusion (MCAO) stroke model with an ischemic region localized to one hemisphere of the brain. Due to similar suppression in ionization of endogenous PC molecules extracted from the tissue and PC standards added to the solvent, matrix effects are eliminated by normalizing the intensity of the sodium and potassium adducts of endogenous PC to the intensity of the corresponding adduct of the PC standard. This approach efficiently compensates for signal variations resulting from differences in the local concentrations of sodium and potassium in tissue sections and from the complexity of the extracted analyte mixture derived from local variations in molecular composition.

  1. Dynamical Role of Mode Water Ventilation in Decadal Variability in the Central Subtropical Gyre of the North Pacific*

    E-Print Network [OSTI]

    Xie, Shang-Ping

    Dynamical Role of Mode Water Ventilation in Decadal Variability in the Central Subtropical Gyre and weakening of the STCC because of var- iations in mode water ventilation. The changes in mode water can are characteristic of changes in mode water ventilation. Indeed, this natural mode of STCC variability is excited

  2. Compensation of the Meyer-Neldel Compensation Law for H diffusion in1 Alan G. Jones, Dublin Institute for Advanced Studies, Dublin 2, Ireland (alan@cp.dias.ie)4

    E-Print Network [OSTI]

    Jones, Alan G.

    Compensation of the Meyer-Neldel Compensation Law for H diffusion in1 minerals2 3 Alan G. Jones/Transport Properties17 Keywords:18 Meyer-Neldel Rule, Compensation Law, Hydrogen Diffusion, Minerals19 #12;Abstract20 The Meyer-Neldel Rule (MNR), or compensation law, linearly relates the pre-exponent term21 to the logarithm

  3. M. Flierl: Motion-Compensated Orthogonal Transforms for Multiview Video Coding, EURASIP EUSIPCO, Poznan, Poland, Sep. 2007. 1 MOTION-COMPENSATED ORTHOGONAL TRANSFORMS

    E-Print Network [OSTI]

    Flierl, Markus

    of motion information. This is in contrast to the well known motion-compensated lifted wavelets where in time and view direction are cascaded. Motion-compensated lifted wavelets suffer from their motion. Well known examples are free viewpoint video [1] and free viewpoint television (FTV) [2]. For all

  4. DYNAMIC MODELING PROTON EXCHANGE MEMBRANE FUEL CELL

    E-Print Network [OSTI]

    Mease, Kenneth D.

    DYNAMIC MODELING PROTON EXCHANGE MEMBRANE FUEL CELL OVERVIEW Current/Completed Plug Power to garner SCAQMD funding for fuel cell testing GenCore system is sensitive to diluents · As built design stream to compensate for removal of EGR · Functionality of the modified GenCore Fuel Cell system

  5. Junipers of the World 84 Key to Caribbean Junipers ( 5 species) (plus J. v. var. virginiana and rev. 2/2011

    E-Print Network [OSTI]

    Adams, Robert P.

    Junipers of the World 84 Key to Caribbean Junipers ( 5 species) (plus J. v. var. virginiana and rev-lobed), on coppice rocks or rocky summits, crowns pyramidal to round, Caribbean 8a. Glands on old brown persistent

  6. Simulation of dynamics-coupling in piezoelectric tube scanners by reduced order finite element analysis

    E-Print Network [OSTI]

    Fleming, Andrew J.

    and imperfections during the manufactur- ing process of the tube on the dynamics-coupling-caused errors in openSimulation of dynamics-coupling in piezoelectric tube scanners by reduced order finite element as the compensation of dynamics-coupling effects. The present article gives a detailed description of the fully

  7. Demand response compensation, net Benefits and cost allocation: comments

    SciTech Connect (OSTI)

    Hogan, William W.

    2010-11-15T23:59:59.000Z

    FERC's Supplemental Notice of Public Rulemaking addresses the question of proper compensation for demand response in organized wholesale electricity markets. Assuming that the Commission would proceed with the proposal ''to require tariff provisions allowing demand response resources to participate in wholesale energy markets by reducing consumption of electricity from expected levels in response to price signals, to pay those demand response resources, in all hours, the market price of energy for such reductions,'' the Commission posed questions about applying a net benefits test and rules for cost allocation. This article summarizes critical points and poses implications for the issues of net benefit tests and cost allocation. (author)

  8. Nuclear reactor control rod cluster for enthalpy rise compensation

    SciTech Connect (OSTI)

    Freeman, T.R.

    1987-07-07T23:59:59.000Z

    This patent describes a control arrangement for use with a nuclear fuel assembly having guide thimbles to provide enthalpy rise compensation, comprising: (a) a spider assembly; and (b) control rodlets containing neutron absorber material, supported at their upper ends from the spider assembly in a pattern which matches that of the guide thimbles and extending generally parallel to one another downwardly for insertion into the guide thimbles of the fuel assembly; (c) the control rodlets arranged in a cluster having a higher axial neutron absorption capability at an upper portion than at a lower portion; each control rodlet varying in axial neutron absorption capability from every other rodlet.

  9. On site relay transient testing for a series compensation upgrade

    SciTech Connect (OSTI)

    McLaren, P.G.; Kuffel, R.; Giesbrecht, J.; Keerthipala, W. (Manitoba HVDC Research Centre, Winnipeg, Manitoba (Canada)); Castro, A.; Fedirchuk, D.; Innes, S. (Manitoba Hydro, Winnipeg, Manitoba (Canada)); Mustaphi, K. (Northern States Power, Minneapolis, MN (United States)); Sletten, K. (Minnesota Power, Duluth, MN (United States))

    1994-07-01T23:59:59.000Z

    This paper describes tests on the relays on a long 500kV ac line carried out on site using the RTDS (Real Time Digital Simulator) of the Manitoba HVDC Research Centre. The purpose of the tests was to examine the relay behavior when series compensation is inserted in the line in 1993. New settings for the relays have been found which will give adequate cover for all faults although some faults will be entirely dependent on the communication link for short clearance times.

  10. Hierarchical Control Scheme for Voltage Harmonics Compensation in an Islanded Droop-

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    Hierarchical Control Scheme for Voltage Harmonics Compensation in an Islanded Droop- Controlled on the resistance emulation. Furthermore, a droop characteristic based on DG harmonic reactive power has been

  11. Saving & Storing Annual Evaluations & Conflict of Interest/Compensated Outside Activity Forms

    E-Print Network [OSTI]

    Hemmers, Oliver

    Saving & Storing Annual Evaluations & Conflict of Interest/Compensated Outside Activity Forms....................................................................................................................................................7 NOTE: Accessing the folders to save Annual Evaluations and Conflict of Interest

  12. Dilaton and axion as compensators coupled to N=1 supergravity

    SciTech Connect (OSTI)

    Nishino, Hitoshi; Rajpoot, Subhash [Department of Physics and Astronomy, California State University, 1250 Bellflower Boulevard, Long Beach, California 90840 (United States)

    2008-12-15T23:59:59.000Z

    We present a locally N=1 supersymmetric model of the dilaton {phi} and the two-form tensor (axion) B{sub {mu}}{sub {nu}} as compensators without propagation. This is a generalization of our previous model with global N=1 supersymmetry to local N=1 supersymmetry. The dilaton {phi} and the axion B{sub {mu}}{sub {nu}} are, respectively, absorbed into the vector A{sub {mu}} and the three-form tensor C{sub {mu}}{sub {nu}}{sub {rho}}, where the latter is dual to the ordinary auxiliary field D in the usual vector multiplet. With local N=1 supersymmetry, we have three multiplets: the multiplet of supergravity (e{sub {mu}}{sup m},{psi}{sub {mu}}), linear multiplet (B{sub {mu}}{sub {nu}},{chi},{phi}), and the vector multiplet (A{sub {mu}},{lambda},C{sub {mu}}{sub {nu}}{sub {rho}}). We find that the field strengths of B and C need the following particular Chern-Simons terms for consistency with local supersymmetry: G{identical_to}3dB-6BD{phi}+3mBA+mC and H=4dC-6BF+4GA+8CD{phi}-4mCA. The newly established supergravity couplings provide the supporting evidence of the consistency of our basic system of the dilaton and axion as compensators.

  13. Causality Analysis of Groundwater dynamics based on a Vector Autoregressive model in the semi-arid basin of Gundal (South India)

    E-Print Network [OSTI]

    Causality Analysis of Groundwater dynamics based on a Vector Autoregressive model in the semi, time space analysis, causality, VAR model, semi-arid region 1. Introduction Large amounts of water. Abstract: Causal relationships existing between observed levels of groundwater in a semi-arid sub

  14. Evaluation of interpolation methods for surface-based motion compensated tomographic reconstruction for cardiac angiographic C-arm data

    SciTech Connect (OSTI)

    Mueller, Kerstin; Schwemmer, Chris; Hornegger, Joachim [Pattern Recognition Lab, Department of Computer Science, Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Erlangen 91058 (Germany); Zheng Yefeng; Wang Yang [Imaging and Computer Vision, Siemens Corporate Research, Princeton, New Jersey 08540 (United States); Lauritsch, Guenter; Rohkohl, Christopher; Maier, Andreas K. [Siemens AG, Healthcare Sector, Forchheim 91301 (Germany); Schultz, Carl [Thoraxcenter, Erasmus MC, Rotterdam 3000 (Netherlands); Fahrig, Rebecca [Department of Radiology, Stanford University, Stanford, California 94305 (United States)

    2013-03-15T23:59:59.000Z

    Purpose: For interventional cardiac procedures, anatomical and functional information about the cardiac chambers is of major interest. With the technology of angiographic C-arm systems it is possible to reconstruct intraprocedural three-dimensional (3D) images from 2D rotational angiographic projection data (C-arm CT). However, 3D reconstruction of a dynamic object is a fundamental problem in C-arm CT reconstruction. The 2D projections are acquired over a scan time of several seconds, thus the projection data show different states of the heart. A standard FDK reconstruction algorithm would use all acquired data for a filtered backprojection and result in a motion-blurred image. In this approach, a motion compensated reconstruction algorithm requiring knowledge of the 3D heart motion is used. The motion is estimated from a previously presented 3D dynamic surface model. This dynamic surface model results in a sparse motion vector field (MVF) defined at control points. In order to perform a motion compensated reconstruction, a dense motion vector field is required. The dense MVF is generated by interpolation of the sparse MVF. Therefore, the influence of different motion interpolation methods on the reconstructed image quality is evaluated. Methods: Four different interpolation methods, thin-plate splines (TPS), Shepard's method, a smoothed weighting function, and a simple averaging, were evaluated. The reconstruction quality was measured on phantom data, a porcine model as well as on in vivo clinical data sets. As a quality index, the 2D overlap of the forward projected motion compensated reconstructed ventricle and the segmented 2D ventricle blood pool was quantitatively measured with the Dice similarity coefficient and the mean deviation between extracted ventricle contours. For the phantom data set, the normalized root mean square error (nRMSE) and the universal quality index (UQI) were also evaluated in 3D image space. Results: The quantitative evaluation of all experiments showed that TPS interpolation provided the best results. The quantitative results in the phantom experiments showed comparable nRMSE of Almost-Equal-To 0.047 {+-} 0.004 for the TPS and Shepard's method. Only slightly inferior results for the smoothed weighting function and the linear approach were achieved. The UQI resulted in a value of Almost-Equal-To 99% for all four interpolation methods. On clinical human data sets, the best results were clearly obtained with the TPS interpolation. The mean contour deviation between the TPS reconstruction and the standard FDK reconstruction improved in the three human cases by 1.52, 1.34, and 1.55 mm. The Dice coefficient showed less sensitivity with respect to variations in the ventricle boundary. Conclusions: In this work, the influence of different motion interpolation methods on left ventricle motion compensated tomographic reconstructions was investigated. The best quantitative reconstruction results of a phantom, a porcine, and human clinical data sets were achieved with the TPS approach. In general, the framework of motion estimation using a surface model and motion interpolation to a dense MVF provides the ability for tomographic reconstruction using a motion compensation technique.

  15. Dead-time compensation for a logarithmic display rate meter

    DOE Patents [OSTI]

    Larson, John A. (Aurora, IL); Krueger, Frederick P. (Aurora, IL)

    1988-09-20T23:59:59.000Z

    An improved circuit is provided for application to a radiation survey meter that uses a detector that is subject to dead time. The circuit compensates for dead time over a wide range of count rates by producing a dead-time pulse for each detected event, a live-time pulse that spans the interval between dead-time pulses, and circuits that average the value of these pulses over time. The logarithm of each of these values is obtained and the logarithms are subtracted to provide a signal that is proportional to a count rate that is corrected for the effects of dead time. The circuit produces a meter indication and is also capable of producing an audible indication of detected events.

  16. Electric vehicle drive train with rollback detection and compensation

    DOE Patents [OSTI]

    Konrad, Charles E. (Roanoke, VA)

    1994-01-01T23:59:59.000Z

    An electric vehicle drive train includes a controller for detecting and compensating for vehicle rollback, as when the vehicle is started upward on an incline. The vehicle includes an electric motor rotatable in opposite directions corresponding to opposite directions of vehicle movement. A gear selector permits the driver to select an intended or desired direction of vehicle movement. If a speed and rotational sensor associated with the motor indicates vehicle movement opposite to the intended direction of vehicle movement, the motor is driven to a torque output magnitude as a nonconstant function of the rollback speed to counteract the vehicle rollback. The torque function may be either a linear function of speed or a function of the speed squared.

  17. Electric vehicle drive train with rollback detection and compensation

    DOE Patents [OSTI]

    Konrad, C.E.

    1994-12-27T23:59:59.000Z

    An electric vehicle drive train includes a controller for detecting and compensating for vehicle rollback, as when the vehicle is started upward on an incline. The vehicle includes an electric motor rotatable in opposite directions corresponding to opposite directions of vehicle movement. A gear selector permits the driver to select an intended or desired direction of vehicle movement. If a speed and rotational sensor associated with the motor indicates vehicle movement opposite to the intended direction of vehicle movement, the motor is driven to a torque output magnitude as a nonconstant function of the rollback speed to counteract the vehicle rollback. The torque function may be either a linear function of speed or a function of the speed squared. 6 figures.

  18. Compensation for TID Damage in SOI Pixel Devices

    E-Print Network [OSTI]

    Tobita, Naoshi; Hara, Kazuhiko; Aoyagi, Wataru; Arai, Yasuo; Miyoshi, Toshinobu; Kurachi, Ikuo; Hatsui, Takaki; Kudo, Togo; Kobayashi, Kazuo

    2015-01-01T23:59:59.000Z

    We are investigating adaption of SOI pixel devices for future high energy physic(HEP) experiments. The pixel sensors are required to be operational in very severe radiation environment. Most challenging issue in the adoption is the TID (total ionizing dose) damage where holes trapped in oxide layers affect the operation of nearby transistors. We have introduced a second SOI layer - SOI2 beneath the BOX (Buried OXide) layer - in order to compensate for the TID effect by applying a negative voltage to this electrode to cancel the effect caused by accumulated positive holes. In this paper, the TID effects caused by Co gamma-ray irradiation are presented based on the transistor characteristics measurements. The irradiation was carried out in various biasing conditions to investigate hole accumulation dependence on the potential configurations. We also compare the data with samples irradiated with X-ray. Since we observed a fair agreement between the two irradiation datasets, the TID effects have been investigated...

  19. Distributed control for optimal reactive power compensation in smart microgrids

    E-Print Network [OSTI]

    Bolognani, Saverio

    2011-01-01T23:59:59.000Z

    We consider the problem of optimal reactive power compensation for the minimization of power distribution losses in a smart microgrid. We first propose an approximate model for the power distribution network, which allows us to cast the problem into the class of convex quadratic, linearly constrained, optimization problems. We also show how this model provides the tools for a distributed approach, in which agents have a partial knowledge of the problem parameters and state, and can only perform local measurements. Then, we design a randomized, gossip-like optimization algorithm, providing conditions for convergence together with an analytic characterization of the convergence speed. The analysis shows that the best performance can be achieved when we command cooperation among agents that are neighbors in the smart microgrid topology. Numerical simulations are included to validate the proposed model and to confirm the analytic results about the performance of the proposed algorithm.

  20. System for throttling and compensation for variable feedstock properties

    DOE Patents [OSTI]

    Meyer, J. W.

    1981-05-05T23:59:59.000Z

    Apparatus is shown for adjusting the feed rate of pulverized feed material into a pressurized container. The apparatus also has utility for compensating for variations in the permeability of the feed material. A rotor that includes sprues with provision for controlling the pressure distribution along the sprues is located within the pressurized container. The rotor hub is connected to a drive means and a material supply means which extend through the wall of the container. A line for controlling pressure along the sprues by gas injection is connected to a chamber between sections of the sprue for controlling gas pressure at that point. The gas pressure control line is connected to a pressurized gas source and a control system external to the rotor. 10 figs.

  1. System for throttling and compensation for variable feedstock properties

    DOE Patents [OSTI]

    Meyer, John W. (Palo Alto, CA)

    1981-01-01T23:59:59.000Z

    Apparatus is shown for adjusting the feed rate of pulverized feed material into a pressurized container. The apparatus also has utility for compensating for variations in the permeability of the feed material. A rotor that includes sprues with provision for controlling the pressure distribution along the sprues is located within the pressurized container. The rotor hub is connected to a drive means and a material supply means which extend through the wall of the container. A line for controlling pressure along the sprues by gas injection is connected to a chamber between sections of the sprue for controlling gas pressure at that point. The gas pressure control line is connected to a pressurized gas source and a control system external to the rotor.

  2. Blind Compensation of Nonlinear Distortions : Application to Source Separation of Post-Nonlinear

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Blind Compensation of Nonlinear Distortions : Application to Source Separation of Post of blind compensation of nonlinear distortions. Our approach relies on the assumption that the input approached is considered in the development of a two-stage method for blind source separation (BSS) in post

  3. Compensation du mouvement respiratoire dans les images TEP Respiratory motion correction in PET images

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Compensation du mouvement respiratoire dans les images TEP Respiratory motion correction in PET itérative. Abstract The quality of the Positron Emission Tomography (PET) is currently limited an integrated system to compensate respiratory motion in PET images. It is based on synchronous acquisition

  4. Adaptive Friction Compensation for Servo J. Wang, S. S. Ge, and T. H. Lee

    E-Print Network [OSTI]

    Ge, Shuzhi Sam

    Adaptive Friction Compensation for Servo Mechanisms J. Wang, S. S. Ge, and T. H. Lee Department@nus.edu.sg Abstract Friction exists in all machines having relative motion, and plays an important role in many servo, accurate friction modeling and effective compensation techniques have to be investigated. In this chapter

  5. Friction Observer and Compensation for Control of Robots with Joint Torque Measurement

    E-Print Network [OSTI]

    De Luca, Alessandro

    Friction Observer and Compensation for Control of Robots with Joint Torque Measurement Luc Le Tien-- In this paper we introduce a friction observer for robots with joint torque sensing (in particular for the DLR. The observer output corresponds to the low-pass filtered friction torque. It is used for friction compensation

  6. Voltage Stability and Power Quality Issues of Wind Farm with Series Compensation

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    Voltage Stability and Power Quality Issues of Wind Farm with Series Compensation T. F. Orchi generator (DFIG) wind farms with series and shunt compensation are analyzed. The voltage source converter of the wind farm are modeled with flicker coefficients as defined by IEC standard 61400 and voltage sag

  7. How to Set the Fractional Power Control Compensation Factor in LTE ?

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    How to Set the Fractional Power Control Compensation Factor in LTE ? Marceau Coupechoux1, Jean-Les-Moulineaux, France jeanmarc.kelif@orange-ftgroup.com Abstract--The uplink power control procedure in Long Term focus on the former and study the compensation factor of the related Fractional Power Control (FPC

  8. Reduced Order Model Compensator Control of Species Transport in a CVD Reactor

    E-Print Network [OSTI]

    Reduced Order Model Compensator Control of Species Transport in a CVD Reactor G.M. Kepler, H for computation of feedback controls and compensators in a high pressure chemical vapor deposition (HPCVD) reactor University to design and build such a HPCVD reactor with real­time sensing and control as an innovative

  9. EVALUATION OF WAVELET DOMAIN BLOCK MOTION COMPENSATION (WBMC) Salzburg University, Dept. of Scientific Computing, Austria

    E-Print Network [OSTI]

    Kutil, Rade

    EVALUATION OF WAVELET DOMAIN BLOCK MOTION COMPENSATION (WBMC) Rade Kutil Salzburg University, Dept.cosy.sbg.ac.at/sc/staff/rade.kutil.html ABSTRACT Wavelet based image compression has proved its superior­ ity over DCT based methods. However, wavelet based tech­ niques did not have so much success in video coding be­ cause motion compensation

  10. PEV-based Reactive Power Compensation for Wind DG Units: A Stackelberg Game Approach

    E-Print Network [OSTI]

    Mohsenian-Rad, Hamed

    balancing supply and demand for active power, we also need to compensate reactive power for each wind DGPEV-based Reactive Power Compensation for Wind DG Units: A Stackelberg Game Approach Chenye Wu, in particular wind power, in form of distributed generation (DG) units. However, one important challenge

  11. PEV-based Reactive Power Compensation for Wind DG Units: A Stackelberg Game Approach

    E-Print Network [OSTI]

    Huang, Jianwei

    balancing supply and demand for active power, we also need to compensate reactive power for each wind DG1 PEV-based Reactive Power Compensation for Wind DG Units: A Stackelberg Game Approach Chenye Wu, in particular wind power, in form of distributed generation (DG) units. However, one important challenge

  12. Deep Pacific CaCO3 compensation and glacialinterglacial atmospheric CO2

    E-Print Network [OSTI]

    Lynch-Stieglitz, Jean

    Deep Pacific CaCO3 compensation and glacial­interglacial atmospheric CO2 Thomas M. Marchittoa into the deep ocean during the last glacial period. According to the dCaCO3 compensationT hypothesis dissolution of CaCO3. The resulting increase in whole-ocean pH may have had a significant impact

  13. Closed-Loop Compensation Method for Oscillations Caused by Control Valve Stiction

    E-Print Network [OSTI]

    Wang, Jiandong

    Closed-Loop Compensation Method for Oscillations Caused by Control Valve Stiction Jiandong Wang-loop compensation method to remove oscillations caused by control valve stiction. With the control loop operating movements for the control valve to arrive at a desired position. A systematic way to design the parameters

  14. A 27 MHZ TEMPERATURE COMPENSATED MEMS OSCILLATOR WITH SUB-PPM INSTABILITY

    E-Print Network [OSTI]

    Ayazi, Farrokh

    A 27 MHZ TEMPERATURE COMPENSATED MEMS OSCILLATOR WITH SUB-PPM INSTABILITY Roozbeh Tabrizian with sub-ppm temperature instability based on a high-Q composite bulk acoustic wave (BAW) resonator transduced silicon resonator to compensate its negative temperature coefficient of frequency (TCF). Using

  15. Reconciling different equations for proton conduction using the Meyer-Neldel compensation

    E-Print Network [OSTI]

    Jones, Alan G.

    Reconciling different equations for proton conduction using the Meyer-Neldel compensation rule Alan of the two formalisms employed by the various laboratories is consistent with the Meyer-Neldel Rule (MNR conduction using the Meyer-Neldel compensation rule, Geo- chem. Geophys. Geosyst., 15, doi:10.1002/2013GC

  16. Reconciling different equations for proton conduction using the Meyer-Neldel compensation

    E-Print Network [OSTI]

    Jones, Alan G.

    Reconciling different equations for proton conduction using the Meyer-Neldel compensation rule Alan of the two formalisms employed by the various laboratories is consistent with the Meyer-Neldel Rule (MNR conduction using the Meyer-Neldel compensation rule, Geo- chem. Geophys. Geosyst., 15, 337­349, doi:10

  17. Apparatus and method to compensate for refraction of radiation

    DOE Patents [OSTI]

    Allen, G.R.; Moskowitz, P.E.

    1990-03-27T23:59:59.000Z

    An apparatus to compensate for refraction of radiation passing through a curved wall of an article is provided. The apparatus of a preferred embodiment is particularly advantageous for use in arc tube discharge diagnostics. The apparatus of the preferred embodiment includes means for pre-refracting radiation on a predetermined path by an amount equal and inverse to refraction which occurs when radiation passes through a first wall of the arc tube such that, when the radiation passes through the first wall of the arc tube and into the cavity thereof, the radiation passes through the cavity approximately on the predetermined path; means for releasably holding the article such that the radiation passes through the cavity thereof; and means for post-refracting radiation emerging from a point of the arc tube opposite its point of entry by an amount equal and inverse to refraction which occurs when radiation emerges from the arc tube. In one embodiment the means for pre-refracting radiation includes a first half tube comprising a longitudinally bisected tube obtained from a tube which is approximately identical to the arc tube's cylindrical portion and a first cylindrical lens, the first half tube being mounted with its concave side facing the radiation source and the first cylindrical lens being mounted between the first half tube and the arc tube and the means for post-refracting radiation includes a second half tube comprising a longitudinally bisected tube obtained from a tube which is approximately identical to the arc tube's cylindrical portion and a second cylindrical lens, the second half tube being mounted with its convex side facing the radiation source and the second cylindrical lens being mounted between the arc tube and the second half tube. Methods to compensate for refraction of radiation passing into and out of an arc tube is also provided. 4 figs.

  18. Spitzer Observations of Var Her 04: Possible Detection of Dust Formation in a Super-Outbursting TOAD

    E-Print Network [OSTI]

    David R. Ciardi; Stefanie Wachter; D. W. Hoard; Steve B. Howell; Gerard T. van Belle

    2006-08-03T23:59:59.000Z

    We present four MIPS (24 \\micron) and two IRAC (3.6, 4.5, 5.8, and 8.0 \\micron) Spitzer observations of the newly discovered Tremendous Outburst Amplitude Dwarf nova (TOAD) Var Her 04 during decline from super-outburst. The four MIPS observations span 271 days and the two IRAC observations span 211 days. Along the line-of-sight to Var Her 04, there is a foreground M-star within 1\\arcsec of the variable; as a result, all of the Spitzer photometry presented in this paper is a blend of the foreground M-star and Var Her 04. We estimate the quiescent level of the TOAD to be $\\Delta V=4-5$ magnitudes below that of the M-star. Based upon the spectral energy distribution and the 2MASS colors, we find the M-star to be an M3.5V dwarf at a distance of 80-130 pc. Based upon its outburst amplitude and quiescent apparent magnitude, we estimate the distance to Var Her 04 to be 200-400 pc, suggesting that the line-of-sight foreground star is physically unrelated to the cataclysmic variable. All of the Spitzer photometry is consistent with the photospheric emission of the line-of-sight M3.5V star, except for one 24 \\micron observation obtained after the variable re-brightened. This 24 \\micron flux density is 75 $\\mu$Jy ($4\\sigma$) above the preceding and following MIPS observations. We tentatively suggest that the mid-infrared brightening of 75 $\\mu$Jy may be associated with a dust formation event in the super-outburst ejecta. Assuming a dust temperature of 100-400 K, we have estimated the amount of dust required. We find $10^{-13}-10^{-11}$ M$_\\odot$ of dust is needed, consistent with amounts of mass ejection in TOADs expected during super-outburst, and possibly making TOADs important contributors to the recycling of the interstellar medium.

  19. Compensation of Variable Skew- and Normal quadrupole Focusing Effects of APPLE-II Undulators with Computer-aided Shimming

    E-Print Network [OSTI]

    Chubar, O V; Couprie, M E; Filhol, J M; Leroy, E; Marteau, F; Paulin, F; Rudenko, O

    2008-01-01T23:59:59.000Z

    Compensation of Variable Skew- and Normal quadrupole Focusing Effects of APPLE-II Undulators with Computer-aided Shimming

  20. Power Compensation Effect of an Adjustable-Speed Rotary Condenser with a Flywheel for a Large Capacity Magnet Power Supply

    E-Print Network [OSTI]

    Akagi, H

    1999-01-01T23:59:59.000Z

    Power Compensation Effect of an Adjustable-Speed Rotary Condenser with a Flywheel for a Large Capacity Magnet Power Supply

  1. Smoothing of respiratory motion traces for motion-compensated radiotherapy

    SciTech Connect (OSTI)

    Ernst, Floris; Schlaefer, Alexander; Schweikard, Achim [Institute for Robotics and Cognitive Systems, University of Luebeck, Ratzeburger Allee 160, Luebeck SH 23538 (Germany)

    2010-01-15T23:59:59.000Z

    Purpose: The CyberKnife system has been used successfully for several years to radiosurgically treat tumors without the need for stereotactic fixation or sedation of the patient. It has been shown that tumor motion in the lung, liver, and pancreas can be tracked with acceptable accuracy and repeatability. However, highly precise targeting for tumors in the lower abdomen, especially for tumors which exhibit strong motion, remains problematic. Reasons for this are manifold, like the slow tracking system operating at 26.5 Hz, and using the signal from the tracking camera ''as is''. Since the motion recorded with the camera is used to compensate for system latency by prediction and the predicted signal is subsequently used to infer the tumor position from a correlation model based on x-ray imaging of gold fiducials around the tumor, camera noise directly influences the targeting accuracy. The goal of this work is to establish the suitability of a new smoothing method for respiratory motion traces used in motion-compensated radiotherapy. The authors endeavor to show that better prediction--With a lower rms error of the predicted signal--and/or smoother prediction is possible using this method. Methods: The authors evaluated six commercially available tracking systems (NDI Aurora, PolarisClassic, Polaris Vicra, MicronTracker2 H40, FP5000, and accuTrack compact). The authors first tracked markers both stationary and while in motion to establish the systems' noise characteristics. Then the authors applied a smoothing method based on the a trous wavelet decomposition to reduce the devices' noise level. Additionally, the smoothed signal of the moving target and a motion trace from actual human respiratory motion were subjected to prediction using the MULIN and the nLMS{sub 2} algorithms. Results: The authors established that the noise distribution for a static target is Gaussian and that when the probe is moved such as to mimic human respiration, it remains Gaussian with the exception of the FP5000 and the Aurora systems. The authors also showed that the proposed smoothing method can indeed be used to filter noise. The signal's jitter dropped by as much as 95% depending on the tracking system employed. Subsequently, the 3D prediction error (rms) for a prediction horizon of 150 ms on a synthetic signal dropped by up to 37% when using a normalized LMS prediction algorithm (nLMS{sub 2}) and hardly changed when using a MULIN algorithm. When smoothing a real signal obtained in our laboratory, the improvement of prediction was similar: Up to 30% for both the nLMS{sub 2} and the best MULIN algorithm. The authors also found a noticeable increase in smoothness of the predicted signal, the relative jitter dropped by up to 95% on the real signal, and on the simulated signal. Conclusions: In conclusion, the authors can say that preprocessing of marker data is very useful in motion-compensated radiotherapy since the quality of prediction increases. This will result in better performance of the correlation model. As a side effect, since the prediction of a preprocessed signal is also less noisy, the authors expect less robot vibration resulting in better targeting accuracy and less strain on the robot gears.

  2. The role of space charge compensation for ion beam extraction and ion beam transport (invited)

    SciTech Connect (OSTI)

    Spädtke, Peter, E-mail: p.spaedtke@gsi.de [GSI Helmholtzzentrum für Schwerionenforschung GmbH (Germany)] [GSI Helmholtzzentrum für Schwerionenforschung GmbH (Germany)

    2014-02-15T23:59:59.000Z

    Depending on the specific type of ion source, the ion beam is extracted either from an electrode surface or from a plasma. There is always an interface between the (almost) space charge compensated ion source plasma, and the extraction region in which the full space charge is influencing the ion beam itself. After extraction, the ion beam is to be transported towards an accelerating structure in most cases. For lower intensities, this transport can be done without space charge compensation. However, if space charge is not negligible, the positive charge of the ion beam will attract electrons, which will compensate the space charge, at least partially. The final degree of Space Charge Compensation (SCC) will depend on different properties, like the ratio of generation rate of secondary particles and their loss rate, or the fact whether the ion beam is pulsed or continuous. In sections of the beam line, where the ion beam is drifting, a pure electrostatic plasma will develop, whereas in magnetic elements, these space charge compensating electrons become magnetized. The transport section will provide a series of different plasma conditions with different properties. Different measurement tools to investigate the degree of space charge compensation will be described, as well as computational methods for the simulation of ion beams with partial space charge compensation.

  3. Development and Implementation of a Compensation Technique for Luminescent Sensors

    E-Print Network [OSTI]

    Collier, Bradley

    2013-09-19T23:59:59.000Z

    suitable method for monitoring multiple responses in vivo has yet to be developed. Due to the measurement flexibility provided by luminescence, a time-domain luminescence lifetime measurement system was developed. The Dynamic Rapid Lifetime Determination...

  4. A Recurrent Neural Multi-Model for Mechanical Systems Dynamics Compensation

    E-Print Network [OSTI]

    Borissova, Daniela

    Mexico D.F., Mexico ** Institute of Information Technologies, 1113 Sofia Abstract: The paper proposed nonlinear mechanical plants with backlash. The parameters and states of the local recurrent neural network of the plant model. For example, N a r e n d r a and P a r t h a s a r a t h y [5], applied FFNN for system

  5. Contributions to the mini-workshop on beam-beam compensation in the Tevatron

    SciTech Connect (OSTI)

    Shiltsev, V.

    1998-02-01T23:59:59.000Z

    The purpose of the Workshop was to assay the current understanding of compensation of the beam-beam effects in the Tevatron with use of low-energy high-current electron beam, relevant accelerator technology, along with other novel techniques of the compensation and previous attempts. About 30 scientists representing seven institutions from four countries--FNAL, SLAC, BNL, Novosibirsk, CERN, and Dubna were in attendance. Twenty one talks were presented. The event gave firm ground for wider collaboration on experimental test of the compensation at the Tevatron collider. This report consists of vugraphs of talks given at the meeting.

  6. A Vernier Regulator for ILC Marx Droop Compensation

    SciTech Connect (OSTI)

    Tang, Tao

    2009-10-30T23:59:59.000Z

    A two-part compensation scheme, Vernier Regulation, has been applied to offset the voltage droop (40% without correction) in a Marx-topology klystron modulator developed for the International Linear Collider (ILC). Coarse regulation, {+-}5%, is achieved by turning on additional Main Marx cells (Delayed Cells) sequentially as the droop reaches the cell voltage (11 kV). Further regulation to {+-}0.5% is achieved by adding a small Marx in series with the Main Marx. This Vernier Marx is composed of sixteen, 1.2 kV cells that are assembled as a seventeenth cell in the Main Marx. These Vernier Cells are turned on sequentially to generate a series of discrete corrections to the droop in the Main Marx cells with a step size {le}1% of the output voltage. As the required correction reaches 11 kV, all Vernier Cells are turned off synchronously with the turn on of a Delayed Cell. There are up to five Delayed Cells and six Vernier Marx cycles during each ILC Marx output pulse. The Vernier Marx has a local control system that will detect and respond to over-voltage and over-current errors. In this paper, a detailed description of the design, implementation and testing of the Vernier Marx is presented.

  7. Revisiting plasma hysteresis with an electronically compensated Langmuir probe

    SciTech Connect (OSTI)

    Srivastava, P. K.; Singh, S. K.; Awasthi, L. M.; Mattoo, S. K. [Institute for Plasma Research, Gandhinagar 382 428 (India)

    2012-09-15T23:59:59.000Z

    The measurement of electron temperature in plasma by Langmuir probes, using ramped bias voltage, is seriously affected by the capacitive current of capacitance of the cable between the probe tip and data acquisition system. In earlier works a dummy cable was used to balance the capacitive currents. Under these conditions, the measured capacitive current was kept less than a few mA. Such probes are suitable for measurements in plasma where measured ion saturation current is of the order of hundreds of mA. This paper reports that controlled balancing of capacitive current can be minimized to less than 20 {mu}A, allowing plasma measurements to be done with ion saturation current of the order of hundreds of {mu}A. The electron temperature measurement made by using probe compensation technique becomes independent of sweep frequency. A correction of {<=}45% is observed in measured electron temperature values when compared with uncompensated probe. This also enhances accuracy in the measurement of fluctuation in electron temperature as {delta}T{sub pk-pk} changes by {approx}30%. The developed technique with swept rate {<=}100 kHz is found accurate enough to measure both the electron temperature and its fluctuating counterpart. This shows its usefulness in measuring accurately the temperature fluctuations because of electron temperature gradient in large volume plasma device plasma with frequency ordering {<=}50 kHz.

  8. Compensated individually addressable array technology for human breast imaging

    DOE Patents [OSTI]

    Lewis, D. Kent (San Francisco, CA)

    2003-01-01T23:59:59.000Z

    A method of forming broad bandwidth acoustic or microwave beams which encompass array design, array excitation, source signal preprocessing, and received signal postprocessing. This technique uses several different methods to achieve improvement over conventional array systems. These methods are: 1) individually addressable array elements; 2) digital-to-analog converters for the source signals; 3) inverse filtering from source precompensation; and 4) spectral extrapolation to expand the bandwidth of the received signals. The components of the system will be used as follows: 1) The individually addressable array allows scanning around and over an object, such as a human breast, without any moving parts. The elements of the array are broad bandwidth elements and efficient radiators, as well as detectors. 2) Digital-to-analog converters as the source signal generators allow virtually any radiated field to be created in the half-space in front of the array. 3) Preprocessing allows for corrections in the system, most notably in the response of the individual elements and in the ability to increase contrast and resolution of signal propagating through the medium under investigation. 4) Postprocessing allows the received broad bandwidth signals to be expanded in a process similar to analytic continuation. Used together, the system allows for compensation to create beams of any desired shape, control the wave fields generated to correct for medium differences, and improve contract and resolution in and through the medium.

  9. Price Discovery in Dynamic Power Markets with Low-Voltage Distribution-Network Participants

    E-Print Network [OSTI]

    Caramanis, Michael

    -distribution network locational marginal prices; power flow; reactive power compensation; voltage control; distributed application to Electric Power [2, 3] dynamic Locational-Marginal-Price (LMP) based Wholesale Power Markets to clear markets and discover dynamic Locational Marginal Prices (LMPs) that promoted more efficient

  10. IEEE Transactions on Automation Science and Engineering Compensation of Scanner Creep and Hysteresis

    E-Print Network [OSTI]

    Southern California, University of

    IEEE Transactions on Automation Science and Engineering Compensation of Scanner Creep uncertainties associated with creep and hysteresis, and supports automated, computer-controlled manipulation) and by automation, which bypasses the time- consuming

  11. COMPENSATION OF TEMPERATURE EFFECTS ON GUIDED WAVE BASED STRUCTURAL HEALTH MONITORING SYSTEMS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    COMPENSATION OF TEMPERATURE EFFECTS ON GUIDED WAVE BASED STRUCTURAL HEALTH MONITORING SYSTEMS C strategy are investigated. KEYWORDS : Structural Health Monitoring (SHM), Guided Waves, Piezoelectric Sensors, Temperature Effects, Signal Processing. Introduction: STRUCTURAL HEALTH MONITORING

  12. Analysis of one-dimensional transforms in coding motion compensation prediction residuals for video applications

    E-Print Network [OSTI]

    Zhang, Harley (Harley H.)

    2011-01-01T23:59:59.000Z

    In video coding, motion compensation prediction provides significant increases in overall compression efficiency. The prediction residuals are typically treated as images and compressed by applying two-dimensional transforms ...

  13. Slip-Compensated Path Following for Planetary Exploration Daniel M. Helmick, Stergios I. Roumeliotis

    E-Print Network [OSTI]

    Waliser, Duane E.

    estimator, and a slip-compensated path following algorithm. Figure 2 provides a high-level functional block kinematics, described in Section 3, uses position sensor inputs from the joints and wheels of the rocker

  14. Executive Compensation and Business Policy Choices at U.S. Commercial Banks

    E-Print Network [OSTI]

    DeYoung, Robert; Peng, Emma Y.; Yan, Meng

    2010-01-01T23:59:59.000Z

    This study examines whether and how the terms of CEO compensation contracts at large commercial banks between 1994 and 2006 influenced, or were influenced by, the risky business policy decisions made by these firms. We ...

  15. Apparatus and method for compensating for clock drift in downhole drilling components

    DOE Patents [OSTI]

    Hall, David R. (Provo, UT); Pixton, David S. (Lehi, UT); Johnson, Monte L. (Orem, UT); Bartholomew, David B. (Springville, UT); Hall, Jr., H. Tracy (Provo, UT)

    2007-08-07T23:59:59.000Z

    A precise downhole clock that compensates for drift includes a prescaler configured to receive electrical pulses from an oscillator. The prescaler is configured to output a series of clock pulses. The prescaler outputs each clock pulse after counting a preloaded number of electrical pulses from the oscillator. The prescaler is operably connected to a compensator module for adjusting the number loaded into the prescaler. By adjusting the number that is loaded into the prescaler, the timing may be advanced or retarded to more accurately synchronize the clock pulses with a reference time source. The compensator module is controlled by a counter-based trigger module configured to trigger the compensator module to load a value into the prescaler. Finally, a time-base logic module is configured to calculate the drift of the downhole clock by comparing the time of the downhole clock with a reference time source.

  16. Employment Verification and Compensation Release Authorization Form Forward the completed form

    E-Print Network [OSTI]

    Employment Verification and Compensation Release Authorization Form Forward the completed form: Via Research Triangle Park, NC 27709 Attn: Employment Verification Name information relative to my employment with the IBM Corporation

  17. Design and characterization of a planar mechanism for passive tilt-compensation

    E-Print Network [OSTI]

    Lai, Justin Yi-Shen

    2007-01-01T23:59:59.000Z

    This work investigated the design and testing of a planar mechanism for passively compensating tilt between two flat surfaces brought into close proximity. The proposed design uses flexural components which eliminate ...

  18. FORWARD MODELING AND ATMOSPHERIC COMPENSATION IN HYPERSPECTRAL DATA: EXPERIMENTAL ANALYSIS FROM A TARGET DETECTION PERSPECTIVE

    E-Print Network [OSTI]

    Kerekes, John

    a Department of Information Engineering, University of Pisa, Pisa, Italy b Center for Imaging Science-based approaches to atmospheric radiative transfer modeling are considered here: Atmosphe- ric Compensation (AC

  19. Lattice design for head-on beam-beam compensation at RHIC

    SciTech Connect (OSTI)

    Montag, C.

    2011-03-28T23:59:59.000Z

    Electron lenses for head-on beam-beam compensation will be installed in IP 10 at RHIC. Compensation of the beam-beam effect experienced at IP 8 requires betatron phase advances of {Delta}{psi} = k {center_dot} {pi} between the proton-proton interaction point at IP 8, and the electron lens at IP 10. This paper describes the lattice solutions for both the BLUE and the YELLOW ring to achieve this goal.

  20. Compensation for L212GLU in bacterial reaction centers

    SciTech Connect (OSTI)

    Hanson, D.K.; Deng, Y.L.; Schiffer, M. [Argonne National Lab., IL (United States); Sebban, P. [Centre de Genetique Moleculaire, Gif/Yvette (France). CNRS

    1995-12-31T23:59:59.000Z

    In wild-type bacterial reaction centers (RC), residue L212Glu, which is located about 5 {Angstrom} away from Q{sub B}, is involved in the delivery of the second proton to Q{sub B{sup 2}{minus}} [1-4]. We previously constructed the L212Glu-L213Asp {yields} Ala-Ala double mutant of Rhodobacter capsulatus, and it is incapable of photosynthetic growth (PS{sup {minus}}) due to interruption of the proton transfer pathway to Q{sub B}[3,4]. We have isolated several photocompetent (PS{sup +}) phenotypic revertants of this L212-L213AA double mutant [3-7]. The compensatory mutations that restore function in these strains are diverse and show that neither L212Glu nor L213Asp is absolutely required for efficient light-induced electron or proton transfer. Genotypic revertant and second-site mutations, located within the Q{sub B} binding picket or at more distant sites, can compensate for mutations at L212 and L213 to restore photocompetence. One of the phenotypic revertants of the L212Ala-L213Ala double mutant carries a genotypic reversion of L213Ala to Asp; the Ala substitution at L212 remains. We were intrigued that this L212Glu {yields} Ala mutant R. capsulatus is photocompetent, while the L212Glu {yields} Gln mutant of R. sphaeroides is not, particularly since the sequence identity in the Q{sub B} site of these two strains is 90{percent} [8]. To this end, we constructed the L212Glu {yields} Gln mutant in R. capsulatus, and it is also PS{sup {minus}}. To determine the function that is lost in the L212Gln mutant but restored by Ala at that site, we selected four PS{sup +} revertants from the L212Gln strain.

  1. Method of Linear Invariants for description of beam dynamics of FEL undulator

    E-Print Network [OSTI]

    A. Angelow; D. Trifonov; V. Angelov; H. Hristov

    2008-05-23T23:59:59.000Z

    We propose a new model for description of electrons beam dynamics in Free Electron Laser (FEL) undulator, based on the method of linear time-dependent invariants of quantum-mechanical charge particle. The magnetic field has periodic structure along the undulator. For this problem, described by time-dependent quadratic Hamiltonian, we obtain exact solution. The time-evolutions of the tree quantum fluctuations: covariance cov(q,p), var(q) and var(p) for the charge particle in this case are also determined. This research will help to optimize the FEL undulator: for example, using a 2.5 GeV linear electron accelerator it will be possible to emit radiation at 1.5 nm and shorter length. This method could be applicable also to any device with periodic structure of applied field (e.g. Tokamak, cyclic accelerators) for the case of charge non-relativistic quantum particles.

  2. Droop Compensation with soft Switching for High Voltage Converter Modulator (HVCM)

    SciTech Connect (OSTI)

    Bland, Michael [University of Nottingham; Scheinker, Alexander [Los Alamos National Laboratory; Clare, Jon [University of Nottingham; Watson, Alan [University of Nottingham; Ji, Chao [University of Nottingham; Reass, William [Los Alamos National Laboratory

    2012-06-04T23:59:59.000Z

    High Voltage Converter Modulators (HVCM) offer significant performance advantages over conventional modulator technologies for long pulse applications. One of the key advantages of HVCM technology is the ability to compensate for capacitor bank voltage droop. Achieving droop compensation without incurring significant additional switching loss has not been possible in existing designs. This paper presents an analysis of the 'Y-point' variant of the HVCM topology using the Combined Phase and Frequency Modulation (CPFM) technique. This, combined with the addition of a 'lossless' snubber circuit, enables droop compensation while achieving soft switching over the entire pulse duration. The rise time and overshoot of the output voltage pulse is optimized using an iterative extreme seeking algorithm. The optimization reduces the rise time from 100 {micro}s to 50 {micro}s with no overshoot. This will lead to an increase in overall accelerator efficiency.

  3. Bunch length effects in the beam-beam compensation with an electron lens

    SciTech Connect (OSTI)

    Fischer, W.; Luo, Y.; Montag, C.

    2010-02-25T23:59:59.000Z

    Electron lenses for the head-on beam-beam compensation are under construction at the Relativistic Heavy Ion Collider. The bunch length is of the same order as the {beta}-function at the interaction point, and a proton passing through another proton bunch experiences a substantial phase shift which modifies the beam-beam interaction. We review the effect of the bunch length in the single pass beam-beam interaction, apply the same analysis to a proton passing through a long electron lens, and study the single pass beam-beam compensation with long bunches. We also discuss the beam-beam compensation of the electron beam in an electron-ion collider ring.

  4. A temperature compensated pressure transducer for high temperature, high pressure applications

    E-Print Network [OSTI]

    Lippka, Sandra Margaret

    1991-01-01T23:59:59.000Z

    and content by: 2/J David G. ansson (Chair ol' Committee) c. Y~ Christian P Burger (i&Iember) Randall Getger ( Member) 5wc Fr~. Walter F. Bradley (Head of Department) May 1991 ABSTRACT A Temperature Compensated Pressure Transducer for High... of the light beam. A compensation schenle is provided through the use of thermally arljusting reflecting surfaces These surfaces can adjust for temperatures up to 1000'F with less than a. I, c error. The final light beam movenlent across the photodiode face...

  5. Space Charge Compensation in the Linac4 Low Energy Beam Transport Line with Negative Hydrogen Ions

    E-Print Network [OSTI]

    Valerio-Lizarraga, C; Leon-Monzon, I; Lettry, J; Midttun, O; Scrivens, R

    2013-01-01T23:59:59.000Z

    The space charge effect of low energy, unbunched ion beams can be compensated by the trapping of ions or electrons into the beam potential. This has been studied for the 45 keV negative hydrogen ion beam in the CERN Linac4 Low Energy Beam Tranport (LEBT) using the package IBSimu1, which allows the space charge calculation of the particle trajectories. The results of the beam simulations will be compared to emittance measurements of an H- beam at the CERN Linac4 3 MeV test stand, where the injection of hydrogen gas directly into the beam transport region has been used to modify the space charge compensation degree.

  6. A 1.12pJ/b Resonance Compensated Inductive Transceiver with a Fault-Tolerant Network Controller

    E-Print Network [OSTI]

    Yoo, Hoi-Jun

    . An inductive-coupling transceiver is used for cross-layer communication, and it adopts a resonance compensatorA 1.12pJ/b Resonance Compensated Inductive Transceiver with a Fault-Tolerant Network Controller of Korea jerald@eeinfo.kaist.ac.kr Abstract--A low-energy inductive coupling link with a low energy fault

  7. Abstract--The detection of single line-to-ground (SLG) fault in compensated distribution networks can be hampered by

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    on particular regime where data is acquired. In transient regime the relays diagnosis based on analysis, power distribution protection, compensated distribution system I. INTRODUCTION N case of low ohmic SLG faults in compensated distribution networks the directional function can be assured by transient relays

  8. 718 IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, VOL. 9, NO. 5, SEPTEMBER 2001 Reactive Power and Unbalance Compensation Using

    E-Print Network [OSTI]

    Stankoviæ, Aleksandar

    718 IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, VOL. 9, NO. 5, SEPTEMBER 2001 Reactive Power as reactive power and unbalance compensators, e.g., Static synchronous compensator (STATCOM). The approach practice. Index Terms--Active filters, adaptive control, dissipative sys- tems, nonlinear systems, reactive

  9. IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 15, NO. 3, AUGUST 2000 909 Transmission Loss Compensation in Multiple

    E-Print Network [OSTI]

    Gross, George

    an independent grid operator (IGO) whose mission is to facilitate access to the grid and ensure comparableIEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 15, NO. 3, AUGUST 2000 909 Transmission Loss Compensation(es) or to purchase the loss compensation service from a central in- dependent grid operator (IGO). The IGO can

  10. Morphological and compositional variations in strain-compensated InGaAsP/InGaP superlattices

    E-Print Network [OSTI]

    Feenstra, Randall

    Morphological and compositional variations in strain- compensated InGaAsP/InGaP superlattices R of Technology, Kista, Sweden Abstract We have investigated the properties of strain-compensated InGaAsP/In- GaP superlattices, grown by metalorganic vapor phase epitaxy, with and without InP interlayers inserted in the InGaP

  11. Office of Human Resources -Employment & Compensation 1 MANAGEMENT NON-MANAGEMENT

    E-Print Network [OSTI]

    Yener, Aylin

    the work of two (2) or more employees · Majority of time is spent directly managing people (i.e. over 50Office of Human Resources - Employment & Compensation 1 MANAGEMENT NON-MANAGEMENT Typically includes, but is not limited to activities such as: Manages direct reports where primary duty

  12. 26 July 2000 TESLA Report 2000-13 Compensation of Solenoid Effects at the TESLA

    E-Print Network [OSTI]

    26 July 2000 TESLA Report 2000-13 Compensation of Solenoid Effects at the TESLA Interaction Point at the TESLA interaction point is 5 nm. The long solenoid encompassing the detector introduces coupling effects along the beam line. This is a concern for a linear collider such as TESLA, where the vertical beam size

  13. Secondary Voltage Unbalance Compensation for Three-Phase Four-Wire Islanded Microgrids

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    as a cluster of distributed resources (DRs), i.e. distributed generation (DG), distributed storage (DSSecondary Voltage Unbalance Compensation for Three-Phase Four-Wire Islanded Microgrids Fen Tang four-wire islanded microgrid systems. It is implemented in the secondary control level of the microgrid

  14. Calcium phosphate cement augmentation of cancellous bone screws can compensate for the absence of cortical fixation

    E-Print Network [OSTI]

    Guerraoui, Rachid

    Calcium phosphate cement augmentation of cancellous bone screws can compensate for the absence Keywords: Screw fixation Pullout force Calcium phosphate cement Osteoporotic bone a b s t r a c with cement. Previous studies have shown that bone augmentation with Calcium Phosphate (CaP) cement

  15. Extra-Contractual Compensation (ECC) / Summer Salary / Summer ECC Process Academic Resources

    E-Print Network [OSTI]

    Hemmers, Oliver

    Extra-Contractual Compensation (ECC) / Summer Salary / Summer ECC Process Academic Resources-up documentation requested from Human Resources or college Forms returned to dean's office for correction/approval and then returned to Acad. Resources when signed Meets cursory review by Academic Resources? Does requested

  16. Error Compensation of Single-Qubit Gates in a Surface Electrode Ion Trap Using Composite Pulses

    E-Print Network [OSTI]

    Emily Mount; Chingiz Kabytayev; Stephen Crain; Robin Harper; So-Young Baek; Geert Vrijsen; Steven Flammia; Kenneth R. Brown; Peter Maunz; Jungsang Kim

    2015-04-06T23:59:59.000Z

    The trapped atomic ion qubits feature desirable properties for use in a quantum computer such as long coherence times (Langer et al., 2005), high qubit measurement fidelity (Noek et al., 2013), and universal logic gates (Home et al., 2009). The quality of quantum logic gate operations on trapped ion qubits has been limited by the stability of the control fields at the ion location used to implement the gate operations. For this reason, the logic gates utilizing microwave fields (Brown et al., 2011; Shappert et al., 2013; Harty et al., 2014) have shown gate fidelities several orders of magnitude better than those using laser fields (Knill et al., 2008; Benhelm et al., 2008; Ballance et al., 2014). Here, we demonstrate low-error single-qubit gates performed using stimulated Raman transitions on an ion qubit trapped in a microfabricated chip trap. Gate errors are measured using a randomized benchmarking protocol (Knill et al., 2008; Wallman et al., 2014; Magesan et al., 2012), where amplitude error in the control beam is compensated using various pulse sequence techniques (Wimperis, 1994; Low et al., 2014). Using B2 compensation (Wimperis, 1994), we demonstrate single qubit gates with an average error per randomized Clifford group gate of $3.6(3)\\times10^{-4}$. We also show that compact palindromic pulse compensation sequences (PD$n$) (Low et al., 2014) compensate for amplitude errors as designed.

  17. Reactive Power Sharing and Voltage Harmonic Distortion Compensation of Droop Controlled

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    1 Reactive Power Sharing and Voltage Harmonic Distortion Compensation of Droop Controlled Single, the inverters typically employ the droop control scheme. Traditional droop control enables the decentralized regulation of the local voltage and frequency of the microgrid by the inverters. The droop method also

  18. Temperature compensated and self-calibrated current sensor using reference current

    DOE Patents [OSTI]

    Yakymyshyn, Christopher Paul (Seminole, FL); Brubaker, Michael Allen (Loveland, CO); Yakymyshyn, Pamela Jane (Seminole, FL)

    2008-01-22T23:59:59.000Z

    A method is described to provide temperature compensation and self-calibration of a current sensor based on a plurality of magnetic field sensors positioned around a current carrying conductor. A reference electrical current carried by a conductor positioned within the sensing window of the current sensor is used to correct variations in the output signal due to temperature variations and aging.

  19. Temperature compensated and self-calibrated current sensor using reference magnetic field

    DOE Patents [OSTI]

    Yakymyshyn, Christopher Paul (Seminole, FL); Brubaker, Michael Allen (Loveland, CO); Yakymyshyn, Pamela Jane (Seminole, FL)

    2007-10-09T23:59:59.000Z

    A method is described to provide temperature compensation and self-calibration of a current sensor based on a plurality of magnetic field sensors positioned around a current carrying conductor. A reference magnetic field generated within the current sensor housing is detected by the magnetic field sensors and is used to correct variations in the output signal due to temperature variations and aging.

  20. Experimental testing and modelling of a passive mechanical steering compensator for high-performance motorcycles

    E-Print Network [OSTI]

    Cambridge, University of

    Experimental testing and modelling of a passive mechanical steering compensator for high of the method to the control of motorcycles steer- ing instabilities. Simulation studies have shown-- This paper presents experimental results and a modelling study of a prototype mechanical device that repre

  1. Compensation for Coarticulation: Disentangling Auditory and Gestural Theories of Perception of Coarticulatory Effects in Speech

    E-Print Network [OSTI]

    The general ecological view of perception (e.g., Gibson, 1979), from which the direct realist theory of speechCompensation for Coarticulation: Disentangling Auditory and Gestural Theories of Perception of Connecticut and Haskins Laboratories, New Haven, Connecticut According to one approach to speech perception

  2. Temporal integration of focus position signal during compensation for pursuit in optic flow

    E-Print Network [OSTI]

    Krekelberg, Bart

    Temporal integration of focus position signal during compensation for pursuit in optic flow Center in optic flow that specifies heading. Concurrent smooth pursuit causes distortion of the retinal flow on optic flow perception has received little attention. Here we separated the effects of velocity and gaze

  3. Noise Driven Short-Time Phase Spectrum Compensation Procedure for Speech Enhancement

    E-Print Network [OSTI]

    Noise Driven Short-Time Phase Spectrum Compensation Procedure for Speech Enhancement Anthony P.lyons, k.paliwal}@griffith.edu.au Abstract Typical speech enhancement algorithms operate on the short- time approach to speech enhancement has been proposed where the noisy mag- nitude spectrum is recombined

  4. Verification of Computer Display Pre-compensation for Visual Aberrations in an Artificial Eye

    E-Print Network [OSTI]

    Barreto, Armando

    Verification of Computer Display Pre-compensation for Visual Aberrations in an Artificial Eye user's eye) has been confirmed for a simple "artificial eye". This device has been constructed from (CCD) array that mimics the retina of a real eye. While the CCD array allows for the inspection

  5. Fuel Puddle Model and AFR Compensator for Gasoline-Ethanol Blends in Flex-Fuel Engines*

    E-Print Network [OSTI]

    Stefanopoulou, Anna

    Fuel Puddle Model and AFR Compensator for Gasoline-Ethanol Blends in Flex-Fuel Engines* Kyung for gasoline-ethanol blends is, thus, necessary for the purpose of air-to-fuel ratio control. In this paper, we- ration, air-to-fuel ratio control, gasoline-ethanol blend, flex-fuel vehicles I. INTRODUCTION Currently

  6. Sensor-less Vibration Suppression and Scan Compensation for Piezoelectric Tube Nanopositioners

    E-Print Network [OSTI]

    Fleming, Andrew J.

    ) (b) Fig. 2. (a) Charge driven tube scanner. (b) Voltage equivalent circuit. introduces two simple nonSensor-less Vibration Suppression and Scan Compensation for Piezoelectric Tube Nanopositioners-fabrication. Much research has proceeded with the aim of reducing hysteresis and vibration, the foremost problems

  7. 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

  8. 31.01.01.V1.04 SUPPLEMENTAL COMPENSATION AND DUAL EMPLOYMENT

    E-Print Network [OSTI]

    31.01.01.V1.04 SUPPLEMENTAL COMPENSATION AND DUAL EMPLOYMENT Supplements System Policy 31 occasionally enter into additional employment within The Texas A&M University System (System) in which payments being made to the employee, and B. dual employment for on-going activities. In either situation

  9. SPATIAL SCALABILITY AND COMPRESSION EFFICIENCY WITHIN A FLEXIBLE MOTION COMPENSATED 3D-DWT

    E-Print Network [OSTI]

    Taubman, David S

    SPATIAL SCALABILITY AND COMPRESSION EFFICIENCY WITHIN A FLEXIBLE MOTION COMPENSATED 3D-DWT Nagita Mehrseresht and David Taubman The University of New South Wales, Sydney, Australia ABSTRACT We investigate , the structure allows us to trade energy compaction with the potential for artifacts at reduced spatial

  10. Improving the Accuracy of Industrial Robots by offline Compensation of Joints Errors

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Improving the Accuracy of Industrial Robots by offline Compensation of Joints Errors Adel Olabi.damak@geomnia.eu Abstract--The use of industrial robots in many fields of industry like prototyping, pre-machining and end errors. Identification methods are presented with experimental validation on a 6 axes industrial robot

  11. High speed cutting with industrial robots: Towards model based compensation of deviations

    E-Print Network [OSTI]

    Stryk, Oskar von

    High speed cutting with industrial robots: Towards model based compensation of deviations Modeling and numerical simulation of the industrial robot with elastic joints Dr.-Ing. M. Stelzer and Prof. Dr. rer. nat, [abele|bauer|weigold]@ptw.tu-darmstadt.de Abstract Application of industrial robots for high speed

  12. Compensated infrared absorption sensor for carbon dioxide and other infrared absorbing gases

    DOE Patents [OSTI]

    Owen, Thomas E.

    2005-11-29T23:59:59.000Z

    A gas sensor, whose chamber uses filters and choppers in either a semicircular geometry or annular geometry, and incorporates separate infrared radiation filters and optical choppers. This configuration facilitates the use of a single infrared radiation source and a single detector for infrared measurements at two wavelengths, such that measurement errors may be compensated.

  13. On compensating tune spread induced by space charge in bunched beams

    SciTech Connect (OSTI)

    Litvinenko, V. N.; Wang, G.

    2014-05-09T23:59:59.000Z

    Space charge effects play significant role in modern-day accelerators. These effects frequently constrain attainable beam parameters in an accelerator, or, in an accelerator chain. They also could limit the luminosity of hadron colliders operating either at low energies or with a sub-TeV high brightness hadron beams. The latter is applied for strongly cooled proton and ion beams in eRHIC – the proposed future electron-ion collider at Brookhaven National Laboratory. A number of schemes for compensating space charge effects in a coasting (e.g. continuous) hadron beam were proposed and some of them had been tested. Using a proper transverse profile of the electron beam (or plasma column) for a coasting beam would compensate both the tune shift and the tune spread in the hadron beam. But all of these methods do not address the issue of tune spread compensation of a bunched hadron beam, e.g. the tune shift dependence on the longitudinal position inside the bunch. In this paper we propose and evaluate a novel idea of using a co-propagating electron bunch with miss-matched longitudinal velocity to compensate the space charge induced tune-shift and tune spread. We present a number of practical examples of such system.

  14. A proposal to improve ecological compensation practice in road and railway projects in Spain

    SciTech Connect (OSTI)

    Villarroya, Ana, E-mail: avillarroya@alumni.unav.es; Puig, Jordi, E-mail: jpbaguer@unav.es

    2013-09-15T23:59:59.000Z

    To reduce ecological impacts caused by development projects, avoidance, minimization and compensation techniques have to be taken together into consideration along Environmental Impact Assessment (EIA) procedures. This paper explores the particular role that ecological compensation has had in recent road and railway EIA procedures in Spain, as seen through the review of a set of recent EIA Records of Decision (RODs) that confirms precedent findings. Noticing that residual impacts are not paid much attention, and that there is no evidence of a solid public participation in ecological impact evaluation, it proposes to increase the awareness on residual impacts, as a way to make easier public access to the allegedly most sensitive moment of EIA implementation: (residual) impact evaluation. -- Highlights: ? Ecological compensation practice in Spain is much lower than avoidance or mitigation. ? Residual impacts are overlooked in EIA processes and public participation is low. ? An increased awareness of residual impacts may also promote public participation. ? Current context needs these small steps to move towards better compensation practice.

  15. Impact of dopant compensation on the electrical properties of silicon for solar cell applications

    E-Print Network [OSTI]

    Impact of dopant compensation on the electrical properties of silicon for solar cell applications cells. I would like to show my gratitude to Dr. Keith McIntosh, also a member of my supervisory panel, for sharing his techni- cal expertise in solar cells characterization and modelisation, for giving me precious

  16. Energy Storage and Reactive Power Compensator in a Large Wind Farm: Preprint

    SciTech Connect (OSTI)

    Muljadi, E.; Butterfield, C. P.; Yinger, R.; Romanowitz, H.

    2003-10-01T23:59:59.000Z

    The size of wind farm power systems is increasing, and so is the number of wind farms contributing to the power systems network. The size of wind turbines is also increasing--from less than 1 MW a few years ago to the 2- to 3-MW machines being installed today and the 5-MW machines under development. The interaction of the wind farm, energy storage, reactive power compensation, and the power system network is being investigated. Because the loads and the wind farms' output fluctuate during the day, the use of energy storage and reactive power compensation is ideal for the power system network. Energy storage and reactive power compensation can minimize real/reactive power imbalances that can affect the surrounding power system. In this paper, we will show how the contribution of wind farms affects the power distribution network and how the power distribution network, energy storage, and reactive power compensation interact when the wind changes. We will also investigate the size of the components in relation to each other and to the power system.

  17. Reduced Order Based Compensator Control of Thin Film Growth in a CVD Reactor

    E-Print Network [OSTI]

    Reduced Order Based Compensator Control of Thin Film Growth in a CVD Reactor H.T. Banks and H chemical vapor deposition (CVD) reactors. An in­ tegral component of this research program is the design of the reactor so that control and sensing are a basic component of the optimal design e#orts for the reactor. We

  18. Reduced Order Based Compensator Control of Thin Film Growth in a CVD Reactor

    E-Print Network [OSTI]

    Reduced Order Based Compensator Control of Thin Film Growth in a CVD Reactor H.T. Banks and H chemical vapor deposition (CVD) reactors. An in- tegral component of this research program is the design of the reactor so that control and sensing are a basic component of the optimal design efforts for the reactor

  19. Examination of a PHEV Bi-Directional Charger System for V2G Reactive Power Compensation

    SciTech Connect (OSTI)

    Kisacikoglu, Mithat C [ORNL] [ORNL; Ozpineci, Burak [ORNL] [ORNL; Tolbert, Leon M [ORNL] [ORNL

    2010-01-01T23:59:59.000Z

    Plug-in hybrid electric vehicles (PHEVs) potentially have the capability to fulfill the energy storage needs of the electric grid by supplying ancillary services such as reactive power compensation. However, in order to allow bidirectional power transfer, the PHEV battery charger should be designed to manage such capability. While many different battery chargers have been available since the inception of the first electric vehicles (EVs), an on-board, conductive charger with bidirectional power transferring capability have recently drawn attention due to their inherent advantages in charging accessibility, ease of use and efficiency. In this study, a reactive power compensation case study using the inverter dc-link capacitor is given when a PHEV battery is under charging operation. Finally, the impact of providing these services on the batteries is also explained.

  20. Space charge compensation in the Linac4 low energy beam transport line with negative hydrogen ions

    SciTech Connect (OSTI)

    Valerio-Lizarraga, Cristhian A., E-mail: cristhian.alfonso.valerio.lizarraga@cern.ch [CERN, Geneva (Switzerland); Departamento de Investigación en Física, Universidad de Sonora, Hermosillo (Mexico); Lallement, Jean-Baptiste; Lettry, Jacques; Scrivens, Richard [CERN, Geneva (Switzerland)] [CERN, Geneva (Switzerland); Leon-Monzon, Ildefonso [Facultad de Ciencias Fisico-Matematicas, Universidad Autónoma de Sinaloa, Culiacan (Mexico)] [Facultad de Ciencias Fisico-Matematicas, Universidad Autónoma de Sinaloa, Culiacan (Mexico); Midttun, Øystein [CERN, Geneva (Switzerland) [CERN, Geneva (Switzerland); University of Oslo, Oslo (Norway)

    2014-02-15T23:59:59.000Z

    The space charge effect of low energy, unbunched ion beams can be compensated by the trapping of ions or electrons into the beam potential. This has been studied for the 45 keV negative hydrogen ion beam in the CERN Linac4 Low Energy Beam Transport using the package IBSimu [T. Kalvas et al., Rev. Sci. Instrum. 81, 02B703 (2010)], which allows the space charge calculation of the particle trajectories. The results of the beam simulations will be compared to emittance measurements of an H{sup ?} beam at the CERN Linac4 3 MeV test stand, where the injection of hydrogen gas directly into the beam transport region has been used to modify the space charge compensation degree.

  1. Enhanced reflection via phase compensation from anomalous dispersion in atomic vapor

    SciTech Connect (OSTI)

    Zhang Junxiang; Zhou Haitao [State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006 (China); Wang Dawei [Beijing Computational Science Research Center, Beijing 100084 (China); Zhu Shiyao [State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006 (China); Beijing Computational Science Research Center, Beijing 100084 (China); Department of Physics, Hong Kong Baptist University (Hong Kong)

    2011-05-15T23:59:59.000Z

    The phase compensation mechanism induced by anomalous dispersion in the reflection process of four-wave mixing (or reflection from a grating) in a three-level system is investigated, where the four wave vectors do not match in vacuum. An efficiency of the reflected signal of as high as 43% from a hot atomic cell of Cs is observed. The maximum reflection occurs when the frequency of the probe beam (and consequently the frequency of the reflected signal) is slightly red detuned from the transition frequency, which is attributed to the phase compensation from the steep anomalous dispersion accompanied with a strong probe absorption. The dependences of the efficiency on the angle between the coupling and probe lights, on the intensity of the coupling, field and on atomic density are studied. A theoretical model is presented and it is in good agreement with the experimental results.

  2. Hadronic energy resolution of a highly granular scintillator-steel hadron calorimeter using software compensation techniques

    E-Print Network [OSTI]

    CALICE Collaboration; C. Adloff; J. Blaha; J. -J. Blaising; C. Drancourt; A. Espargilière; R. Gaglione; N. Geffroy; Y. Karyotakis; J. Prast; G. Vouters; K. Francis; J. Repond; J. Smith; L. Xia; E. Baldolemar; J. Li; S. T. Park; M. Sosebee; A. P. White; J. Yu; T. Buanes; G. Eigen; Y. Mikami; N. K. Watson; T. Goto; G. Mavromanolakis; M. A. Thomson; D. R. Ward; W. Yan; D. Benchekroun; A. Hoummada; Y. Khoulaki; M. Benyamna; C. Cârloganu; F. Fehr; P. Gay; S. Manen; L. Royer; G. C. Blazey; A. Dyshkant; J. G. R. Lima; V. Zutshi; J. -Y. Hostachy; L. Morin; U. Cornett; D. David; G. Falley; K. Gadow; P. Göttlicher; C. Günter; B. Hermberg; S. Karstensen; F. Krivan; A. -I. Lucaci-Timoce; S. Lu; B. Lutz; S. Morozov; V. Morgunov; M. Reinecke; F. Sefkow; P. Smirnov; M. Terwort; A. Vargas-Trevino; N. Feege; E. Garutti; I. Marchesini; M. Ramilli; P. Eckert; T. Harion; A. Kaplan; H. -Ch. Schultz-Coulon; W. Shen; R. Stamen; A. Tadday; B. Bilki; E. Norbeck; Y. Onel; G. W. Wilson; K. Kawagoe; P. D. Dauncey; A. -M. Magnan; M. Wing; F. Salvatore; E. Calvo Alamillo; M. -C. Fouz; J. Puerta-Pelayo; V. Balagura; B. Bobchenko; M. Chadeeva; M. Danilov; A. Epifantsev; O. Markin; R. Mizuk; E. Novikov; V. Rusinov; E. Tarkovsky; N. Kirikova; V. Kozlov; P. Smirnov; Y. Soloviev; P. Buzhan; B. Dolgoshein; A. Ilyin; V. Kantserov; V. Kaplin; A. Karakash; E. Popova; S. Smirnov; C. Kiesling; S. Pfau; K. Seidel; F. Simon; C. Soldner; M. Szalay; M. Tesar; L. Weuste; J. Bonis; B. Bouquet; S. Callier; P. Cornebise; Ph. Doublet; F. Dulucq; M. Faucci Giannelli; J. Fleury; H. Li; G. Martin-Chassard; F. Richard; Ch. de la Taille; R. Pöschl; L. Raux; N. Seguin-Moreau; F. Wicek; M. Anduze; V. Boudry; J-C. Brient; D. Jeans; P. Mora de Freitas; G. Musat; M. Reinhard; M. Ruan; H. Videau; B. Bulanek; J. Zacek; J. Cvach; P. Gallus; M. Havranek; M. Janata; J. Kvasnicka; D. Lednicky; M. Marcisovsky; I. Polak; J. Popule; L. Tomasek; M. Tomasek; P. Ruzicka; P. Sicho; J. Smolik; V. Vrba; J. Zalesak; B. Belhorma; H. Ghazlane; T. Takeshita; S. Uozumi; J. Sauer; S. Weber; C. Zeitnitz

    2012-09-27T23:59:59.000Z

    The energy resolution of a highly granular 1 m3 analogue scintillator-steel hadronic calorimeter is studied using charged pions with energies from 10 GeV to 80 GeV at the CERN SPS. The energy resolution for single hadrons is determined to be approximately 58%/sqrt(E/GeV}. This resolution is improved to approximately 45%/sqrt(E/GeV) with software compensation techniques. These techniques take advantage of the event-by-event information about the substructure of hadronic showers which is provided by the imaging capabilities of the calorimeter. The energy reconstruction is improved either with corrections based on the local energy density or by applying a single correction factor to the event energy sum derived from a global measure of the shower energy density. The application of the compensation algorithms to Geant4 simulations yield resolution improvements comparable to those observed for real data.

  3. On the application of computational fluid dynamics codes for liquefied natural gas dispersion.

    SciTech Connect (OSTI)

    Luketa-Hanlin, Anay Josephine; Koopman, Ronald P. (Lawrence Livermore National Laboratory, Livermore, CA); Ermak, Donald (Lawrence Livermore National Laboratory, Livermore, CA)

    2006-02-01T23:59:59.000Z

    Computational fluid dynamics (CFD) codes are increasingly being used in the liquefied natural gas (LNG) industry to predict natural gas dispersion distances. This paper addresses several issues regarding the use of CFD for LNG dispersion such as specification of the domain, grid, boundary and initial conditions. A description of the k-{var_epsilon} model is presented, along with modifications required for atmospheric flows. Validation issues pertaining to the experimental data from the Burro, Coyote, and Falcon series of LNG dispersion experiments are also discussed. A description of the atmosphere is provided as well as discussion on the inclusion of the Coriolis force to model very large LNG spills.

  4. Microphonics detuning compensation in 3.9 GHZ superconducting RF cavities

    SciTech Connect (OSTI)

    Ruben Carcagno et al.

    2003-10-20T23:59:59.000Z

    Mechanical vibrations can detune superconducting radio frequency (SCRF) cavities unless a tuning mechanism counteracting the vibrations is present. Due to their narrow operating bandwidth and demanding mechanical structure, the 13-cell 3.9GHz SCRF cavities for the Charged Kaons at Main Injector (CKM) experiment at Fermilab are especially susceptible to this microphonic phenomena. We present early results correlating RF frequency detuning with cavity vibration measurements for CKM cavities; initial detuning compensation results with piezoelectric actuators are also presented.

  5. Automatic compensation of antenna beam roll-off in SAR images.

    SciTech Connect (OSTI)

    Doerry, Armin Walter

    2006-04-01T23:59:59.000Z

    The effects of a non-uniform antenna beam are sometimes visible in Synthetic Aperture Radar (SAR) images. This might be due to near-range operation, wide scenes, or inadequate antenna pointing accuracy. The effects can be mitigated in the SAR image by fitting very a simple model to the illumination profile and compensating the pixel brightness accordingly, in an automated fashion. This is accomplished without a detailed antenna pattern calibration, and allows for drift in the antenna beam alignments.

  6. Environmental Guidance Program Reference Book: Comprehensive Environmentally Response, Compensation, and Liability Act

    SciTech Connect (OSTI)

    Not Available

    1991-12-31T23:59:59.000Z

    This Reference Book contains a current copy of the Comprehensive Environmental Response Compensation, and Liability Act and those regulations that implement the statute and appear to be most relevant to Department of Energy (DOE) activities. The document is provided to DOE and contractor staff for informational purposes only and should not be interpreted as legal guidance. Updates that include important new requirements will be provided periodically. Questions concerning this Reference Book may be directed to Mark Petts, EH-231 (FTS 896-2609 or Commercial 202/586-2609).

  7. eRHIC ring-ring design with head-on beam-beam compensation

    SciTech Connect (OSTI)

    Montag,C.; Blaskiewicz, M.; Pozdeyev, E.; Fischer, W.; MacKay, W. W.

    2009-05-04T23:59:59.000Z

    The luminosity of the eRHIC ring-ring design is limited by the beam-beam effect exerted on the electron beam. Recent simulation studies have shown that the beam-beam limit can be increased by means of an electron lens that compensates the beam-beam effect experienced by the electron beam. This scheme requires proper design of the electron ring, providing the correct betatron phase advance between interaction point and electron lens. We review the performance of the eRHIC ring-ring version and discuss various parameter sets, based on different cooling schemes for the proton/ion beam.

  8. A high throughput (>90%), large compensation range, single-prism femtosecond pulse compressor

    E-Print Network [OSTI]

    Kong, Lingjie

    2013-01-01T23:59:59.000Z

    We demonstrate a high throughput, large compensation range, single-prism femtosecond pulse compressor, using a single prism and two roof mirrors. The compressor has zero angular dispersion, zero spatial dispersion, zero pulse-front tilt, and unity magnification. The high efficiency is achieved by adopting two roof mirrors as the retroreflectors. We experimentally achieved ~ -14500 fs2 group delay dispersion (GDD) with 30 cm of prism tip-roof mirror prism separation, and ~90.7% system throughput with the current implementation. With better components, the throughput can be even higher.

  9. Detailed design, fabrication and testing of an engineering prototype compensated pulsed alternator. Final report

    SciTech Connect (OSTI)

    Bird, W.L. Jr.; Woodson, H.H.

    1980-03-01T23:59:59.000Z

    The design, fabrication, and test results of a prototype compensated pulsed alternator are discussed. The prototype compulsator is a vertical shaft single phase alternator with a rotating armature and salient pole stator. The machine is designed for low rep rate pulsed duty and is sized to drive a modified 10 cm Beta amplifier. The load consists of sixteen 15 mm x 20 mm x 112 cm long xenon flashlamps connected in parallel. The prototype compulsator generates an open circuit voltage of 6 kV, 180 Hz, at a maximum design speed of 5400 rpm. At maximum speed, the inertial energy stored in the compulsator rotor is 3.4 megajoules.

  10. NONDESTRUCTIVE EVALUATION OF HYBRID BEARING CERAMIC ROLLERS USING PROCESS COMPENSATED RESONANT TESTING (PCRT)

    SciTech Connect (OSTI)

    Singh, Surendra [NDT Engineering, M and PE, Honeywell Aerospace, Phoenix, AZ 85034 (United States); Jauriqui, Leanne; Sloan, Trista [Vibrant Corporation, 5550 Midway Park Place NE, Albuquerque, NM 87109 (United States)

    2010-02-22T23:59:59.000Z

    We have used Process Compensated Resonant Testing (PCRT) for studying structural integrity and functional performance of ceramic balls used in various auxiliary power units (APUs), propulsion engines, and defense and space missiles. The results show that PCRT is successful in sorting acceptable parts from parts with defects such as micro-structural changes, C-cracks, and scuffs. However, PCRT suffers from limitations, generally not determining the type, size or location of the anomaly. The pursuit of improvements to PCRT is an on-going process.

  11. An investigation of Bjerknes Compensation in the Southern Ocean in the CCSM4

    SciTech Connect (OSTI)

    Weijer, Wilbert [Los Alamos National Laboratory; Kinstle, Caroline M. [Los Alamos National Laboratory

    2012-08-28T23:59:59.000Z

    This project aims to understand the relationship between poleward oceanic and atmospheric heat transport in the Southern Ocean by analyzing output from the community Climate System Model Version 4 (CCSM4). In particular, time series of meridional heat transport in both the atmosphere and the ocean are used to study whether variability in ocean heat transport is balanced by opposing changes in atmospheric heat transport, called Bjerknes Compensation. It is shown that the heat storage term in the Southern Ocean has a significant impact on the oceanic heat budget; as a result, no robust coherences between oceanic and atmospheric heat transports could be found at these southern latitudes.

  12. Handling oversampling in dynamic networks using link prediction

    E-Print Network [OSTI]

    Fish, Benjamin

    2015-01-01T23:59:59.000Z

    Oversampling is a common characteristic of data representing dynamic networks. It introduces noise into representations of dynamic networks, but there has been little work so far to compensate for it. Oversampling can affect the quality of many important algorithmic problems on dynamic networks, including link prediction. Link prediction seeks to predict edges that will be added to the network given previous snapshots. We show that not only does oversampling affect the quality of link prediction, but that we can use link prediction to recover from the effects of oversampling. We also introduce a novel generative model of noise in dynamic networks that represents oversampling. We demonstrate the results of our approach on both synthetic and real-world data.

  13. A combined compensation method for the output voltage of an insulated core transformer power supply

    SciTech Connect (OSTI)

    Yang, L.; Yang, J., E-mail: jyang@mail.hust.edu.cn; Liu, K. F.; Qin, B.; Chen, D. Z. [State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074 (China)

    2014-06-15T23:59:59.000Z

    An insulated core transformer (ICT) power supply is an ideal high-voltage generator for irradiation accelerators with energy lower than 3 MeV. However, there is a significant problem that the structure of the segmented cores leads to an increase in the leakage flux and voltage differences between rectifier disks. A high level of consistency in the output of the disks helps to achieve a compact structure by improving the utilization of both the rectifier components and the insulation distances, and consequently increase the output voltage of the power supply. The output voltages of the disks which are far away from the primary coils need to be improved to reduce their inhomogeneity. In this study, by investigating and comparing the existing compensation methods, a new combined compensation method is proposed, which increases the turns on the secondary coils and employs parallel capacitors to improve the consistency of the disks, while covering the entire operating range of the power supply. This method turns out to be both feasible and effective during the development of an ICT power supply. The non-uniformity of the output voltages of the disks is less than 3.5% from no-load to full-load, and the power supply reaches an output specification of 350 kV/60 mA.

  14. Steady-State Flow-Force Compensation in a Hydraulic Spool Valve

    E-Print Network [OSTI]

    Lugowski, Jan

    2013-01-01T23:59:59.000Z

    A high-speed jet flowing inside of a partially-open hydraulic valve is accompanied by a reaction force, also referred to as flow force. The nature of this force has remained a mystery despite an extensive research effort spanning many decades. The momentum theory on the flow force by Lee and Blackburn (1952) explains the origin of the flow force and offers a design solution to shape the valve spool as a turbine bucket. It provides a model to calculate the compensated flow force as well. This paper shows that the model applies to a different flow case due to incorrect assumptions made. A corrected equation is presented based on a detailed analysis of the static-pressure distribution in the valve cavity as well as on a literature review of pressure loss in diffusers and nozzles. The new equation is based on the compensation taking place upstream of the valve orifice, not downstream as assumed by the momentum theory. The new model can be applied to chamfers or notches on the valve spool without the need to machi...

  15. Electronic measurement apparatus movable in a cased borehole and compensating for casing resistance differences

    DOE Patents [OSTI]

    Vail, W.B. III.

    1991-12-24T23:59:59.000Z

    Methods of operation are described for an apparatus having at least two pairs of voltage measurement electrodes vertically disposed in a cased well to measure the resistivity of adjacent geological formations from inside the cased well. During stationary measurements with the apparatus at a fixed vertical depth within the cased well, the invention herein discloses methods of operation which include a measurement step and subsequent first and second compensation steps respectively resulting in improved accuracy of measurement. The invention also discloses multiple frequency methods of operation resulting in improved accuracy of measurement while the apparatus is simultaneously moved vertically in the cased well. The multiple frequency methods of operation disclose a first A.C. current having a first frequency that is conducted from the casing into formation and a second A.C. current having a second frequency that is conducted along the casing. The multiple frequency methods of operation simultaneously provide the measurement step and two compensation steps necessary to acquire accurate results while the apparatus is moved vertically in the cased well. 6 figures.

  16. Complex Dynamics

    E-Print Network [OSTI]

    Complex Dynamics Bernardo Da Costa, Koushik Ramachandran, Jingjing Qu, and I had a two semester learning seminar in complex analysis and potential ...

  17. Heterogeneity of SPECT bull`s-eyes in normal dogs: Comparison of attenuation compensation algorithms

    SciTech Connect (OSTI)

    DiBella, E.V.R.; Eisner, R.L.; Schmarkey, L.S.; Barclay, A.B.; Patterson, R.E.; Nowak, D.J.; Lalush, D.S.; Tsui, B.M.W. [Georgia Inst. of Technology, Atlanta, GA (United States). Dept. of Electrical Engineering] [Georgia Inst. of Technology, Atlanta, GA (United States). Dept. of Electrical Engineering; [Emory Univ., Atlanta, GA (United States). Crawford Long Hospital; [Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Biomedical Engineering

    1995-08-01T23:59:59.000Z

    In normal dogs, SPECT {sup 99m}Tc Sestamibi (MIBI) and {sup 201}Tl myocardial perfusion images reconstructed with filtered backprojection (FBP) show a large decrease of counts in the septal wall (S) compared to the lateral wall (L). The authors evaluated the iterative method of Chang at 0 and 1 iterations (Chang0 and Chang1), and the Maximum Likelihood-Expectation Maximization with attenuation compensation (ML-EM-ATN) algorithm on data acquired from 5 normal dogs and from simulated projection data using a homogeneous count-density model of a normal canine myocardium in the attenuation field measured in one dog. Mean counts in the S and L regions were calculated from maximum-count circumferential profile arrays. Their results demonstrate that ML-EM-ATN and Chang1 result in improved uniformity, as measured by the S/L ratio.

  18. Demonstration of nonlinear-energy-spread compensation in relativistic electron bunches with corrugated structures

    E-Print Network [OSTI]

    Fu, Feichao; Zhu, Pengfei; Zhao, Lingrong; Jiang, Tao; Lu, Chao; Liu, Shengguang; Shi, Libin; Yan, Lixin; Deng, Haixiao; Feng, Chao; Gu, Qiang; Huang, Dazhang; Liu, Bo; Wang, Dong; Wang, Xingtao; Zhang, Meng; Zhao, Zhentang; Stupakov, Gennady; Xiang, Dao; Zhang, Jie

    2015-01-01T23:59:59.000Z

    High quality electron beams with flat distributions in both energy and current are critical for many accelerator-based scientific facilities such as free-electron lasers and MeV ultrafast electron diffraction and microscopes. In this Letter we report on using corrugated structures to compensate for the beam nonlinear energy chirp imprinted by the curvature of the radio-frequency field, leading to a significant reduction in beam energy spread. By using a pair of corrugated structures with orthogonal orientations, we show that the quadrupole wake fields which otherwise increase beam emittance can be effectively canceled. This work also extends the applications of corrugated structures to the low beam charge (a few pC) and low beam energy (a few MeV) regime and may have a strong impact in many accelerator-based facilities.

  19. Method and system for improved resolution of a compensated calorimeter detector

    DOE Patents [OSTI]

    Dawson, John W. (Willowbrook, IL)

    1991-01-01T23:59:59.000Z

    An improved method and system for a depleted uranium calorimeter detector used in high energy physics experiments. In a depleted uranium calorimeter detector, the energy of a particle entering the calorimeter detector is determined and the output response of the calorimeter detector is compensated so that the ratio of the integrated response of the calorimeter detector from a lepton to the integrated response of the calorimeter detector from a hadron of the same energy as the lepton is approximately equal to 1. In the present invention, the energy of a particle entering the calorimeter detector is determined as a function of time and the hadron content of the response of the calorimeter detector is inferred based upon the time structure of the energy pulse measured by the calorimeter detector. The energy measurement can be corrected based on the inference of the hadron content whereby the resolution of the calorimeter can be improved.

  20. Photovoltaic power converter system with a controller configured to actively compensate load harmonics

    DOE Patents [OSTI]

    de Rooij, Michael Andrew (Clifton Park, NY); Steigerwald, Robert Louis (Burnt Hills, NY); Delgado, Eladio Clemente (Burnt Hills, NY)

    2008-12-16T23:59:59.000Z

    Photovoltaic power converter system including a controller configured to reduce load harmonics is provided. The system comprises a photovoltaic array and an inverter electrically coupled to the array to generate an output current for energizing a load connected to the inverter and to a mains grid supply voltage. The system further comprises a controller including a first circuit coupled to receive a load current to measure a harmonic current in the load current. The controller includes a second circuit to generate a fundamental reference drawn by the load. The controller further includes a third circuit for combining the measured harmonic current and the fundamental reference to generate a command output signal for generating the output current for energizing the load connected to the inverter. The photovoltaic system may be configured to compensate harmonic currents that may be drawn by the load.

  1. Nuclear Instruments and Methods in Physics Research A 554 (2005) 340346 A compensated fission detector based on photovoltaic cells

    E-Print Network [OSTI]

    Danon, Yaron

    2005-01-01T23:59:59.000Z

    Nuclear Instruments and Methods in Physics Research A 554 (2005) 340­346 A compensated fission online 16 September 2005 Abstract Standard techniques of event-by-event detection of fission may failV proton-driven lead slowing-down neutron spectrometer at LANSCE where standard fission detectors are found

  2. UCSD Medical Center Ergonomic Funding Assistance Form Purpose: The UCSD Medical Center Workers' Compensation Unit (WCU) currently has funds

    E-Print Network [OSTI]

    Gleeson, Joseph G.

    UCSD Medical Center Ergonomic Funding Assistance Form Purpose: The UCSD Medical Center Workers' Compensation Unit (WCU) currently has funds available to assist departments implement ergonomic recommendations identified during an ergonomic assessment. This program will match up to 50% of the cost of identified

  3. INTERNATIONALJOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING. VOL.7,417-433 (1993) LEARNING GRAVITY COMPENSATION IN ROBOTS

    E-Print Network [OSTI]

    De Luca, Alessandro

    1993-01-01T23:59:59.000Z

    task that can be solved either by PID control or by model-basedgravity compensation. These approaches for a two-link robot with a flexible forearm. KEY WORDS Robot control Regulation Elastic joints Flexible manipulators Iterative learning 1. INTRODUCTION Regulation of multilink manipulators is often performed using

  4. Abstract Reactive Power Compensation in Electric Systems is usually studied as a constrained Single-objective Optimization

    E-Print Network [OSTI]

    Coello, Carlos A. Coello

    Abstract Reactive Power Compensation in Electric Systems is usually studied as a constrained of calculation, better defined Pareto Front and a larger number of Pareto solutions. Index Terms Reactive Power.mail: {bbaran, jvallejo, rramos}@cnc.una.py). U. Fernández is with the National Electricity Administration

  5. Effects of V2G Reactive Power Compensation on the Component Selection in an EV or PHEV Bidirectional Charger

    E-Print Network [OSTI]

    Tolbert, Leon M.

    , electric vehicle, EV, PHEV, reactive power, V2G. I. NOMENCLATURE Vde (t) instantaneous dc link voltage, [VEffects of V2G Reactive Power Compensation on the Component Selection in an EV or PHEV Bidirectional Charger Mithat C. Kisacikoglu1 , Burak Ozpineci2 , and Leon M. Tolbert1 ,2 I Dept. of Electrical

  6. 1698 IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, VOL. 18, NO. 3, SEPTEMBER 2008 Self Field Effect Compensation in an HTS Tube

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Effect Compensation in an HTS Tube Bruno Douine, Kévin Berger, Jean Lévêque, Denis Netter, Olivia Arbey flux density in an HTS tube. It allows characterizing the true zero magnetic flux den- sity behaviour- sity . The characteristic is very important to calculate AC losses in superconducting wires. Indeed

  7. Does the "Feebate" Approach to A/E Compensation Lead to an Energy-Efficient John Busch and Rick Diamond

    E-Print Network [OSTI]

    Diamond, Richard

    and Rick Diamond Lawrence Berkeley Laboratory Energy and Environment Division Berkeley CA 94720 USA are almost exclusively used in retrofit situations where the baseline energy consumption is moreDoes the "Feebate" Approach to A/E Compensation Lead to an Energy-Efficient Building?* John Busch

  8. Real-time interactions between cortical neurons and computational models : synaptic conductance analysis and digital compensation of electrode artifacts.

    E-Print Network [OSTI]

    Destexhe, Alain

    of the electrode, considered as an arbitrary linear circuit. This circuit's impulse response is first established analysis and digital compensation of electrode artifacts. Zuzanna Piwkowska PhD thesis defended at the UNIC conductance, each generated by a stochastic process. We used this model as a basis for analysis tools allowing

  9. Carbon incorporation for strain compensation during solid phase epitaxial recrystallization of SiGe on Si at 500600 C

    E-Print Network [OSTI]

    Florida, University of

    Carbon incorporation for strain compensation during solid phase epitaxial recrystallization of SiGe in the MBE grown SiGe layers prior to regrowth at moderate temperatures 500­700 °C has three main effects­10 and photodetectors.11,12 The addition of germa- nium to silicon allows the resulting SiGe layer to have a reduced

  10. IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 50, NO. 1, FEBRUARY 2003 161 Improving Passive Filter Compensation Performance

    E-Print Network [OSTI]

    Catholic University of Chile (Universidad Católica de Chile)

    the filter losses and reduces the filtering effectiveness at the tuned frequency. Technical disadvantages reactance. Another technical disadvantage of passive filters is related to the small design tolerances and discussed in technical papers [1]­[6]. Hybrid topology im- proves the compensation characteristics

  11. Introduction Linear Dynamics

    E-Print Network [OSTI]

    Zeghib, Abdelghani

    Introduction Results Linear Dynamics Lorentz Dynamics Actions of discrete groups on stationary Piccione) Geodeycos Meeting, Lyon, 28-30 April 2010 Abdelghani Zeghib Dynamics on Lorentz manifolds #12;Introduction Results Linear Dynamics Lorentz Dynamics Motivations and questions Examples 1 Introduction

  12. MERCHOP (Merchandising Optimizer): A dynamic programming model for estimating the harvest value of unthinned loblolly and slash pine plantations. Forest Service research paper

    SciTech Connect (OSTI)

    Busby, R.L.; Ward, K.B.

    1989-01-01T23:59:59.000Z

    A model was devised to estimate the harvest value of unthinned loblolly and slash pine (pinus taeda L. and P. elliottii var. elliottii Englm.) plantations in the west gulf region. The model, MERCHOP, can be used to forecast product volumes and values; the output provided is partitioned into 1-inch tree d.b.h. classes. Using a dynamic programming algorithm, MERCHOP can be used to convert stand tables predicted by USLYCOWG's three-parameter Weibull function into a listing of seven products that maximizes the selling value of the stand, assuming the assumptions used in the analysis are correct.

  13. An alternative isolated wind electric pumping system using induction machines

    SciTech Connect (OSTI)

    Miranda, M.S.; Lyra, R.O.C.; Silva, S.R.

    1999-12-01T23:59:59.000Z

    An isolated variable speed variable frequency wind electric pumping system is proposed. Induction machines are used both in the generation unit as well as in the pumping unit and a static VAR compensator is used for providing the magnetizing currents of both machines. An indirect induction generator stator flux control strategy is adopted. System steady state and dynamic operation is studied basing on simulation and experimental results.

  14. Dynamic Voltage Regulation Using Distributed Energy Resources

    SciTech Connect (OSTI)

    Xu, Yan [ORNL; Rizy, D Tom [ORNL; Li, Fangxing [ORNL; Kueck, John D [ORNL

    2007-01-01T23:59:59.000Z

    Many distributed energy resources (DE) are near load centres and equipped with power electronics converters to interface with the grid, therefore it is feasible for DE to provide ancillary services such as voltage regulation, nonactive power compensation, and power factor correction. A synchronous condenser and a microturbine with an inverter interface are implemented in parallel in a distribution system to regulate the local voltage. Voltage control schemes of the inverter and the synchronous condenser are developed. The experimental results show that both the inverter and the synchronous condenser can regulate the local voltage instantaneously, while the dynamic response of the inverter is faster than the synchronous condenser; and that integrated voltage regulation (multiple DE perform voltage regulation) can increase the voltage regulation capability, increase the lifetime of the equipment, and reduce the capital and operation costs.

  15. Characterization of the environmental fate of Bacillus thuringiensis var. kaurstaki (Btk) after pest eradication efforts in Seattle, WA and Fairfax county, VA

    SciTech Connect (OSTI)

    Ticknor, Lawrence [Los Alamos National Laboratory; Van Cuyk, Sheila M [Los Alamos National Laboratory; Deshpande, Alina [Los Alamos National Laboratory; Omberg, Kristin M [Los Alamos National Laboratory

    2008-01-01T23:59:59.000Z

    Understanding the fate of biological agents in the environment will be critical to recovery and restoration efforts after a biological attack. Los Alamos National Laboratory (LANL) is conducting experiments in the Seattle, WA and Fairfax County, VA areas to study agent fate in urban environments. As part of their gypsy moth suppression efforts, Washington State and Fairfax County have sprayed Bacillus thuringiensis var. kurstaki (Btk), a common organic pesticide for decades. Many of the spray zones have been in or near urban areas. LANL has collected surface and bulk samples from historical Seattle spray zones to characterize how long Btk persists at detectable levels in the environment, and how long it remains viable in different environmental matrices. This work will attempt to address three questions. First, how long does the agent remain viable at detectable levels? Second, what is the approximate magnitude and duration of resuspension? And third, does the agent transport into buildings? Data designed to address the first question will be presented. Preliminary results indicate Btk remains viable in the environment for at least two years.

  16. Dynamic stability of running: The effects of speed and leg amputations on the maximal Lyapunov exponent

    SciTech Connect (OSTI)

    Look, Nicole [Department of Applied Mathematics, University of Colorado Boulder, Boulder, Colorado 80309 (United States)] [Department of Applied Mathematics, University of Colorado Boulder, Boulder, Colorado 80309 (United States); Arellano, Christopher J.; Grabowski, Alena M.; Kram, Rodger [Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado 80309 (United States)] [Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado 80309 (United States); McDermott, William J. [The Orthopedic Specialty Hospital, Murray, Utah 84107 (United States)] [The Orthopedic Specialty Hospital, Murray, Utah 84107 (United States); Bradley, Elizabeth [Department of Computer Science, University of Colorado Boulder, Boulder, Colorado 80309, USA and Santa Fe Institute, Santa Fe, New Mexico 87501 (United States)] [Department of Computer Science, University of Colorado Boulder, Boulder, Colorado 80309, USA and Santa Fe Institute, Santa Fe, New Mexico 87501 (United States)

    2013-12-15T23:59:59.000Z

    In this paper, we study dynamic stability during running, focusing on the effects of speed, and the use of a leg prosthesis. We compute and compare the maximal Lyapunov exponents of kinematic time-series data from subjects with and without unilateral transtibial amputations running at a wide range of speeds. We find that the dynamics of the affected leg with the running-specific prosthesis are less stable than the dynamics of the unaffected leg and also less stable than the biological legs of the non-amputee runners. Surprisingly, we find that the center-of-mass dynamics of runners with two intact biological legs are slightly less stable than those of runners with amputations. Our results suggest that while leg asymmetries may be associated with instability, runners may compensate for this effect by increased control of their center-of-mass dynamics.

  17. The Prototype Inductive Adder With Droop Compensation for the CLIC Kicker Systems

    E-Print Network [OSTI]

    Holma, J

    2014-01-01T23:59:59.000Z

    The Compact Linear Collider (CLIC) study is exploring the scheme for an electron-positron collider with high luminosity and a nominal center-of-mass energy of 3 TeV. The CLIC predamping rings and damping rings (DRs) will produce, through synchrotron radiation, an ultralow emittance beam with high bunch charge. To avoid beam emittance increase, the DR kicker systems must provide extremely flat, high-voltage, pulses. The specifications for the extraction kickers of the DRs are particularly demanding: the flattops of the pulses must be ±12.5 kV with a combined ripple and droop of not more than ±0.02% (±2.5 V). An inductive adder is a very promising approach to meeting the specifications. Recently, a five-layer prototype has been built at CERN. Passive analog modulation has been applied to compensate the voltage droop, for example of the pulse capacitors. The output waveforms of the prototype inductive adder have been compared with predictions of the voltage droop and pulse shape. Conclusions are drawn concern...

  18. Modeling and mapping ferroresonant states in series compensated distribution and subtransmission lines

    SciTech Connect (OSTI)

    Barr, R.A. [Electric Power Consulting Pty Ltd., Culburra Beach, New South Wales (Australia)] [Electric Power Consulting Pty Ltd., Culburra Beach, New South Wales (Australia); Platt, D. [Univ. of Wollongong, New South Wales (Australia). Dept. of Electrical and Computer Engineering] [Univ. of Wollongong, New South Wales (Australia). Dept. of Electrical and Computer Engineering

    1996-04-01T23:59:59.000Z

    Series capacitors can increase the power carrying capacity of subtransmission and distribution lines by reducing voltage regulation. The potential exists in selected locations for utilities to both improve the customer quality of supply and increase the supply capacity. The possibility of ferroresonance and effective countermeasures to ferroresonance are important issues that need to be carefully considered at the design stage. Other design issues are capacitor location, ohmic reactive value, transient behavior, short circuit withstand and capacitor protection. Ferroresonance can cause severe overvoltages and heavy currents resulting in damage to power system equipment and customer installations. This paper describes a ferroresonance model incorporating both time domain and frequency domain techniques. The ferroresonance model is used to map the possible ferroresonant states. A small scale laboratory non-linear ferroresonant circuit was constructed with the experimental results comparing favorably with the predicted model behavior. For series compensated lines and other circuit arrangements, the ferroresonance model allows the prediction of ferroresonant states and the examination of counter measures.

  19. Design of a Solid-State Fast Voltage Compensator for klystron modulators requiring constant AC power consumption

    E-Print Network [OSTI]

    Davide, Aguglia; Philippe, Viarouge; Jerome, Cros

    2015-01-01T23:59:59.000Z

    This paper proposes a novel topological solution for klystron modulators integrating a Fast Voltage Compensator which allows an operation at constant power consumption from the utility grid. This kind of solution is mandatory for the CLIC project under study, which requires several hundreds of synchronously operated klystron modulators for a total pulsed power of 39 GW. The topology is optimized for the challenging CLIC specifications, which require a very precise output voltage flat-top as well as fast rise and fall times (3µs). The Fast Voltage Compensator is integrated in the modulator such that it only has to manage the capacitor charger current and a fraction of the charging voltage. Consequently, its dimensioning power and cost is minimized.

  20. The effect of head-on beam-beam compensation on the stochastic boundaries and particle diffusion in RHIC.

    SciTech Connect (OSTI)

    Abreu,N.; Beebe-Wang, J.; FischW; Luo, Y.; Robert-Demolaize, G.

    2008-06-23T23:59:59.000Z

    To compensate the effects from the head-on beam-beam interactions in the polarized proton operation in the Relativistic Heavy Ion Collider (RHIC), an electron lens (elens) is proposed to collide head-on with the proton beam. We used an extended version of SixTrack for multiparticle beam-beam simulation in order to study the effect of the e-lens on the stochastic boundary and also on diffusion. The stochastic boundary was analyzed using Lyapunov exponents and the diffusion was characterized as the increase in the rms spread of the action. For both studies the simulations were performed with and without the e-lens and with full and partial compensation. Using the simulated values of the diffusion an attempt to calculate the emittance growth rate is presented.

  1. Possibilities for Measurement and Compensation of Stray DC Electric Fields Acting on Drag-Free Test Masses

    E-Print Network [OSTI]

    W. J. Weber; L. Carbone; A. Cavalleri; R. Dolesi; C. D. Hoyle; M. Hueller; S. Vitale

    2003-09-13T23:59:59.000Z

    DC electric fields can combine with test mass charging and thermal dielectric voltage noise to create significant force noise acting on the drag-free test masses in the LISA (Laser Interferometer Space Antenna) gravitational wave mission. This paper proposes a simple technique to measure and compensate average stray DC potentials at the mV level, yielding substantial reduction in this source of force noise. We discuss the attainable resolution for both flight and ground based experiments.

  2. Effect of charge compensation on the photoelectrochemical properties of Ho-doped SrTiO{sub 3} films

    SciTech Connect (OSTI)

    Zhao, Long; Fang, Liang; Dong, Wen; Zheng, Fengang; Shen, Mingrong [Jiangsu Key Laboratory of Thin Films and Department of Physics, Soochow University, Suzhou 215006 (China)] [Jiangsu Key Laboratory of Thin Films and Department of Physics, Soochow University, Suzhou 215006 (China); Wu, Tom [Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371 (Singapore)] [Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371 (Singapore)

    2013-03-25T23:59:59.000Z

    When Ho{sup 3+} ions are substituted at Sr{sup 2+} sites in SrTiO{sub 3} (STO), the excess positive charges are compensated via three complementary routes: (1) strontium vacancies, (2) titanium vacancies, and (3) conduction electrons. In this study, we show that the photoelectrochemical properties of Ho-doped STO films are dependent on the charge compensation mechanisms. The compensation mechanism via the titanium vacancies exhibits the highest photocurrent density, which is 1.7 times higher than that of the pure STO sample. Based on the measured dielectric properties and electrochemical impedance spectroscopy data, we propose that the enhanced dielectric constant of the films can enlarge the width of the space charge region at the film/liquid interface, which eventually leads to the increase of the photocurrent density. Further enhancement of photocurrent density is obtained in the samples decorated with appropriate amounts of Pt nanoparticles, showing the advantage of composites for achieving the efficient photoelectrochemical property.

  3. IEEE Transactions on Power Apparatus and Systems, Vol. PAS-101, No. 6 June 1982 A TWO-STEP COMPENSATION METHOD FOR SOLVING SHORT CIRCUIT PROBLEMS

    E-Print Network [OSTI]

    Gross, George

    -STEP COMPENSATION METHOD FOR SOLVING SHORT CIRCUIT PROBLEMS G. Gross Pacific Gas and Electric Company San Francisco requires that three-phase systems be solved and the representa- tion of mutual couplings in the network

  4. University of Virginia Agency 207 Accident Report for Workers' Compensation Claim Please complete this form and turn it in to your department's Human Resource Coordinator or

    E-Print Network [OSTI]

    Acton, Scott

    University of Virginia Agency 207 Accident Report for Workers' Compensation Claim Please complete Accident Reported: __________Reported Accident to:___________________________________ Was Supervisor(es)___________________________________________________________________ Information About the Nature and Cause of Accident Machine, tool, or object causing injury

  5. Introduction to Dynamic Distributed

    E-Print Network [OSTI]

    Roma "La Sapienza", Università di

    Introduction to Dynamic Distributed SystemsSystems #12;Outline Introduction Churn Building Applications in Dynamic Distributed Systems RegistersRegisters Eventual Leader election Connectivity in Dynamic Distributed Systems #12;Dynamic Distributed Systems: Context & Motivations Advent of Complex Distributed

  6. Flavor Dynamics

    E-Print Network [OSTI]

    Michael Murray; for the BRAHMS Collaboration

    2007-10-24T23:59:59.000Z

    The purpose of BRAHMS is to survey the dynamics of relativistic heavy ion (as well as pp and d-A) collisions over a very wide range of rapidity and transverse momentum. The sum of these data may give us a glimpse of the initial state of the system, its transverse and longitudinal evolution and how the nature of the system changes with time. Here I will concentrate on the origin and dynamics of the light flavors, i.e. the creation and transport of the up, down and strange quarks. The results presented here are certainly not the end of the story. It is my hope that in a few years new detectors will reveal the rapidity dependence of the charm and bottom quarks.

  7. Self-compensating fiber optic flow sensor having an end of a fiber optics element and a reflective surface within a tube

    DOE Patents [OSTI]

    Peng, Wei; Qi, Bing; Wang, Anbo

    2006-05-16T23:59:59.000Z

    A flow rate fiber optic transducer is made self-compensating for both temperature and pressure by using preferably well-matched integral Fabry-Perot sensors symmetrically located around a cantilever-like structure. Common mode rejection signal processing of the outputs allows substantially all effects of both temperature and pressure to be compensated. Additionally, the integral sensors can individually be made insensitive to temperature.

  8. Compensation of the AKT signaling by ERK signaling in transgenic mice hearts overexpressing TRIM72

    SciTech Connect (OSTI)

    Ham, Young-Mi, E-mail: youngmi_ham@hms.harvard.edu [College of Life Science and Biotechnology, Korea University, Seoul (Korea, Republic of); Department of Cell Biology, Harvard Medical School, Boston, MA 02115 (United States); Mahoney, Sarah Jane [Department of Cell Biology, Harvard Medical School, Boston, MA 02115 (United States)

    2013-06-10T23:59:59.000Z

    The AKT and ERK signaling pathways are known to be involved in cell hypertrophy, proliferation, survival and differentiation. Although there is evidence for crosstalk between these two signaling pathways in cellulo, there is less evidence for cross talk in vivo. Here, we show that crosstalk between AKT and ERK signaling in the hearts of TRIM72-overexpressing transgenic mice (TRIM72-Tg) with alpha-MHC promoter regulates and maintains their heart size. TRIM72, a heart- and skeletal muscle-specific protein, downregulates AKT-mTOR signaling via IRS-1 degradation and reduces the size of rat cardiomyocytes and the size of postnatal TRIM72-Tg hearts. TRIM72 expression was upregulated by hypertrophic inducers in cardiomyocytes, while IRS-1 was downregulated by IGF-1. TRIM72 specifically regulated IGF-1-dependent AKT-mTOR signaling, resulting in a reduction of the size of cardiomyocytes. Postnatal TRIM72-Tg hearts were smaller than control-treated hearts with inhibition of AKT-mTOR signaling. However, adult TRIM72-Tg hearts were larger than of control despite the suppression of AKT-mTOR signaling. Activation of ERK, PKC-?, and JNK were observed to be elevated in adult TRIM72-Tg, and these signals were mediated by ET-1 via the ET receptors A and B. Altogether, these results suggest that AKT signaling regulates cardiac hypertrophy in physiological conditions, and ERK signaling compensates for the absence of AKT signaling during TRIM72 overexpression, leading to pathological hypertrophy. -- Highlights: • TRIM72 inhibits AKT signaling through ubiquitination of IRS-1 in cardiac cells. • TRIM72 regulates the size of cardiac cells. • TRIM72 regulates size of postnatal TRIM72-overexpressing transgenic mice hearts. • Adult TRIM72-overexpressing transgenic mice hearts showed cardiac dysfunction. • Adult TRIM72 transgenic mice hearts showed higher expression of endothelin receptors.

  9. Voltage sensing systems and methods for passive compensation of temperature related intrinsic phase shift

    DOE Patents [OSTI]

    Davidson, James R. (Idaho Falls, ID); Lassahn, Gordon D. (Idaho Falls, ID)

    2001-01-01T23:59:59.000Z

    A small sized electro-optic voltage sensor capable of accurate measurement of high levels of voltages without contact with a conductor or voltage source is provided. When placed in the presence of an electric field, the sensor receives an input beam of electromagnetic radiation into the sensor. A polarization beam displacer serves as a filter to separate the input beam into two beams with orthogonal linear polarizations. The beam displacer is oriented in such a way as to rotate the linearly polarized beams such that they enter a Pockels crystal at a preferred angle of 45 degrees. The beam displacer is therefore capable of causing a linearly polarized beam to impinge a crystal at a desired angle independent of temperature. The Pockels electro-optic effect induces a differential phase shift on the major and minor axes of the input beam as it travels through the Pockels crystal, which causes the input beam to be elliptically polarized. A reflecting prism redirects the beam back through the crystal and the beam displacer. On the return path, the polarization beam displacer separates the elliptically polarized beam into two output beams of orthogonal linear polarization representing the major and minor axes. In crystals that introduce a phase differential attributable to temperature, a compensating crystal is provided to cancel the effect of temperature on the phase differential of the input beam. The system may include a detector for converting the output beams into electrical signals, and a signal processor for determining the voltage based on an analysis of the output beams. The output beams are amplitude modulated by the frequency of the electric field and the amplitude of the output beams is proportional to the magnitude of the electric field, which is related to the voltage being measured.

  10. This document downloaded from www.microgrids.et.aau.dk is a preprint version from the paper: L. Meng, T. Dragicevic, J.M. Guerrero, J.C. Vasquez, M. Savaghebi, F. Tang, "Agent-based distributed unbalance compensation for optimal power quality in

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    -based Distributed Unbalance Compensation for Optimal Power Quality in Islanded Microgrids Lexuan Meng, Tomislav, the distributed generators (DG) can be used as distributed compensators so as to compensate the voltage unbalances as to compensate the unbalances at the critical bus. In case of microgrids, distributed generators (DGs) can

  11. A Multilevel Active Front-End Rectifier With Current Harmonic Compensation Capability

    E-Print Network [OSTI]

    Catholic University of Chile (Universidad Católica de Chile)

    in multilevel rectifiers. The control scheme is described in terms of principles of operations, dynamic modeling and simultaneously as a rectifier. The control scheme is simple and forces the power system line current is the voltage distribution across each electrolytic capacitor, which depends on the control scheme

  12. New Technique for Developing a Proton Range Compensator With Use of a 3-Dimensional Printer

    SciTech Connect (OSTI)

    Ju, Sang Gyu, E-mail: sg.ju@samsung.com [Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul (Korea, Republic of); Kim, Min Kyu; Hong, Chae-Seon; Kim, Jin Sung; Han, Youngyih; Choi, Doo Ho [Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul (Korea, Republic of); Shin, Dongho; Lee, Se Byeong [Proton Therapy Center, National Cancer Center, Gyeonggi-do (Korea, Republic of)

    2014-02-01T23:59:59.000Z

    Purpose: A new system for manufacturing a proton range compensator (RC) was developed by using a 3-dimensional printer (3DP). The physical accuracy and dosimetric characteristics of the new RC manufactured by 3DP (RC{sub 3}DP) were compared with those of a conventional RC (RC{sub C}MM) manufactured by a computerized milling machine (CMM). Methods and Materials: An RC for brain tumor treatment with a scattered proton beam was calculated with a treatment planning system, and the resulting data were converted into a new format for 3DP using in-house software. The RC{sub 3}DP was printed with ultraviolet curable acrylic plastic, and an RC{sub C}MM was milled into polymethylmethacrylate using a CMM. The inner shape of both RCs was scanned by using a 3D scanner and compared with TPS data by applying composite analysis (CA; with 1-mm depth difference and 1 mm distance-to-agreement criteria) to verify their geometric accuracy. The position and distal penumbra of distal dose falloff at the central axis and field width of the dose profile at the midline depth of spread-out Bragg peak were measured for the 2 RCs to evaluate their dosimetric characteristics. Both RCs were imaged on a computed tomography scanner to evaluate uniformity of internal density. The manufacturing times for both RCs were compared to evaluate the production efficiency. Results: The pass rates for the CA test were 99.5% and 92.5% for RC{sub 3}DP and RC{sub C}MM, respectively. There was no significant difference in dosimetric characteristics and uniformity of internal density between the 2 RCs. The net fabrication times of RC{sub 3}DP and RC{sub C}MM were about 18 and 3 hours, respectively. Conclusions: The physical accuracy and dosimetric characteristics of RC{sub 3}DP were comparable with those of the conventional RC{sub C}MM, and significant system minimization was provided.

  13. Angular Averaged Profiling of the Radial Electric Field in Compensated FTICR Cells

    SciTech Connect (OSTI)

    Tolmachev, Aleksey V.; Robinson, Errol W.; Wu, Si; Smith, Richard D.; Futrell, Jean H.; Pasa-Tolic, Ljiljana

    2012-05-08T23:59:59.000Z

    A recent publication from this laboratory (1) reported a theoretical analysis comparing approaches for creating harmonic ICR cells. We considered two examples of static segmented cells - namely, a seven segment cell developed in this laboratory (2) and one described by Rempel et al (3), along with a recently described dynamically harmonized cell (4). This conceptual design for a dynamically harmonized cell has now been reduced to practice and first experimental results obtained with this cell were recently reported in this journal (5). This publication reports details of cell construction and describes its performance in a 7 Tesla Fourier Transform mass spectrometer. Herein, we describe the extension of theoretical analysis presented in (1) to include angular-averaged radial electric field calculations and a discussion of the influence of trapping plates.

  14. Radical advancement in multi-spectral imaging for autonomous vehicles (UAVs, UGVs, and UUVs) using active compensation.

    SciTech Connect (OSTI)

    Clark, Brian F.; Bagwell, Brett E.; Wick, David Victor

    2007-01-01T23:59:59.000Z

    The purpose of this LDRD was to demonstrate a compact, multi-spectral, refractive imaging systems using active optical compensation. Compared to a comparable, conventional lens system, our system has an increased operational bandwidth, provides for spectral selectivity and, non-mechanically corrects aberrations induced by the wavelength dependent properties of a passive refractive optical element (i.e. lens). The compact nature and low power requirements of the system lends itself to small platforms such as autonomous vehicles. In addition, the broad spectral bandwidth of our system would allow optimized performance for both day/night use, and the multi-spectral capability allows for spectral discrimination and signature identification.

  15. Hyperbolic Dynamics Todd Fisher

    E-Print Network [OSTI]

    Fisher, Todd

    Hyperbolic Dynamics Todd Fisher tfisher@math.umd.edu Department of Mathematics University of Maryland, College Park Hyperbolic Dynamics ­ p. 1/3 #12;What is a dynamical system? Phase space X, elements possible states Hyperbolic Dynamics ­ p. 2/3 #12;What is a dynamical system? Phase space X, elements

  16. Material dynamics under extreme conditions of pressure and strain rate

    SciTech Connect (OSTI)

    Remington, B A; Allen, P; Bringa, E; Hawreliak, J; Ho, D; Lorenz, K T; Lorenzana, H; Meyers, M A; Pollaine, S W; Rosolankova, K; Sadik, B; Schneider, M S; Swift, D; Wark, J; Yaakobi, B

    2005-09-06T23:59:59.000Z

    Solid state experiments at extreme pressures (10-100 GPa) and strain rates ({approx}10{sup 6}-10{sup 8}s{sup -1}) are being developed on high-energy laser facilities, and offer the possibility for exploring new regimes of materials science. These extreme solid-state conditions can be accessed with either shock loading or with a quasi-isentropic ramped pressure drive. Velocity interferometer measurements establish the high pressure conditions. Constitutive models for solid-state strength under these conditions are tested by comparing 2D continuum simulations with experiments measuring perturbation growth due to the Rayleigh-Taylor instability in solid-state samples. Lattice compression, phase, and temperature are deduced from extended x-ray absorption fine structure (EXAFS) measurements, from which the shock-induced {alpha}-{omega} phase transition in Ti and the {alpha}-{var_epsilon} phase transition in Fe are inferred to occur on sub-nanosec time scales. Time resolved lattice response and phase can also be measured with dynamic x-ray diffraction measurements, where the elastic-plastic (1D-3D) lattice relaxation in shocked Cu is shown to occur promptly (< 1 ns). Subsequent large-scale molecular dynamics (MD) simulations elucidate the microscopic dynamics that underlie the 3D lattice relaxation. Deformation mechanisms are identified by examining the residual microstructure in recovered samples. The slip-twinning threshold in single-crystal Cu shocked along the [001] direction is shown to occur at shock strengths of {approx}20 GPa, whereas the corresponding transition for Cu shocked along the [134] direction occurs at higher shock strengths. This slip-twinning threshold also depends on the stacking fault energy (SFE), being lower for low SFE materials. Designs have been developed for achieving much higher pressures, P > 1000 GPa, in the solid state on the National Ignition Facility (NIF) laser.

  17. The Microscopic Linear Dynamics

    E-Print Network [OSTI]

    Penny, Will

    The Microscopic Brain Will Penny Linear Dynamics Exponentials Matrix Exponential Eigendecomposition Dynamical Modes Nodes State Space Saddles Oscillations Spirals Centres Offsets Retinal Circuit Nullclines Stability Spiking Neurons Fitzhugh-Nagumo Nonlinear Dynamics Linearization Nonlinear Oscillation Excitable

  18. Neutronnetvrk var forlber for forskningsrummet

    E-Print Network [OSTI]

    VIDENSKAB KRÆVER STORE FACILITETER RISØNYT 3/02 ECN (NL) European Synchrotron Radiation Facility (FR (FR) National Radiological Protection Board (GB) Garrad Hassan and Partners (GB) Finnish

  19. Protein Dynamics and Biocatalysis

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

    Protein Dynamics and Biocatalysis Protein Dynamics and Biocatalysis 1998 Annual Report Grand Challenge Projects biocatalysis.gif A model of the Michaelis complex for the TEM-1...

  20. Use of dMLC for implementation of dynamic respiratory-gated radiation therapy

    SciTech Connect (OSTI)

    Pepin, Eric W.; Wu, Huanmei [Purdue School of Engineering Technology, IUPUI, Indianapolis, Indiana 46202 (United States)] [Purdue School of Engineering Technology, IUPUI, Indianapolis, Indiana 46202 (United States); Shirato, Hiroki [Hokkaido University School of Medicine, Sapporo 060-8638 (Japan)] [Hokkaido University School of Medicine, Sapporo 060-8638 (Japan)

    2013-10-15T23:59:59.000Z

    Purpose: To simulate and evaluate the use of dynamic multileaf collimators (dMLC) in respiratory gating to compensate for baseline drift.Methods: Tumor motion tracking data from 30 lung tumors over 322 treatment fractions was analyzed with the finite state model. A dynamic respiratory gating window was established in real-time by determining the average positions during the previous two end-of-expiration breathing phases and centering the dMLC aperture on a weighted average of these positions. A simulated dMLC with physical motion constraints was used in dynamic gating treatment simulations. Fluence maps were created to provide a statistical description of radiation delivery for each fraction. Duty cycle was also calculated for each fraction.Results: The average duty cycle was 2.3% greater under dynamic gating conditions. Dynamic gating also showed higher fluences and less tumor obstruction. Additionally, dynamic gating required fewer beam toggles and each delivery period was longer on average than with static gating.Conclusions: The use of dynamic gating showed better performance than static gating and the physical constraints of a dMLC were shown to not be an impediment to dynamic gating.

  1. Dynamics of the Coupled Human-climate System Resulting from Closed-loop Control of Solar Geoengineering

    SciTech Connect (OSTI)

    MacMartin, Douglas; Kravitz, Benjamin S.; Keith, David; Jarvis, Andrew

    2014-07-08T23:59:59.000Z

    If solar radiation management (SRM) were ever implemented, feedback of the observed climate state might be used to adjust the radiative forcing of SRM, in order to compensate for uncertainty in either the forcing or the climate response; this would also compensate for unexpected changes in the system, e.g. a nonlinear change in climate sensitivity. This feedback creates an emergent coupled human-climate system, with entirely new dynamics. In addition to the intended response to greenhouse-gas induced changes, the use of feedback would also result in a geoengineering response to natural climate variability. We use a simple box-diffusion dynamic model to understand how changing feedback-control parameters and time delay affect the behavior of this coupled natural-human system, and verify these predictions using the HadCM3L general circulation model. In particular, some amplification of natural variability is unavoidable; any time delay (e.g., to average out natural variability, or due to decision-making) exacerbates this amplification, with oscillatory behavior possible if there is a desire for rapid correction (high feedback gain), but a delayed response needed for decision making. Conversely, the need for feedback to compensate for uncertainty, combined with a desire to avoid excessive amplification, results in a limit on how rapidly SRM could respond to uncertain changes.

  2. First-principles study of compensation mechanisms in negatively charged LaGaO3/MgAl2O4 interfaces

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Rébola, Alejandro; Fong, Dillon D.; Eastman, Jeffrey A.; Ö?üt, Serdar; Zapol, Peter

    2013-06-01T23:59:59.000Z

    Thin film oxide heterostructures with a bound charge at the interface require electrical compensation, which can involve redistribution of mobile charge carriers. We explore a model LaGaO3(001)//MgAl2O4(001) heterostructure with nominally negatively charged interfaces using first-principles methods and a Poisson-Boltzmann equation. We find that charge compensation by oxygen vacancies with quadratically decaying concentration away from the interface is more favorable than electronic redistribution. These vacancies have a potential to enhance ionic conductivity along the interfaces.

  3. Space-charge compensation measurements in electron cyclotron resonance ion source low energy beam transport lines with a retarding field analyzer

    SciTech Connect (OSTI)

    Winklehner, D.; Leitner, D., E-mail: leitnerd@nscl.msu.edu; Cole, D.; Machicoane, G.; Tobos, L. [National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)] [National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)

    2014-02-15T23:59:59.000Z

    In this paper we describe the first systematic measurement of beam neutralization (space charge compensation) in the ECR low energy transport line with a retarding field analyzer, which can be used to measure the potential of the beam. Expected trends for the space charge compensation levels such as increase with residual gas pressure, beam current, and beam density could be observed. However, the overall levels of neutralization are consistently low (<60%). The results and the processes involved for neutralizing ion beams are discussed for conditions typical for ECR injector beam lines. The results are compared to a simple theoretical beam plasma model as well as simulations.

  4. Luminescent systems based on the isolation of conjugated PI systems and edge charge compensation with polar molecules on a charged nanostructured surface

    DOE Patents [OSTI]

    Ivanov, Ilia N.; Puretzky, Alexander A.; Zhao, Bin; Geohegan, David B.; Styers-Barnett, David J.; Hu, Hui

    2014-07-15T23:59:59.000Z

    A photoluminescent or electroluminescent system and method of making a non-luminescent nanostructured material into such a luminescent system is presented. The method of preparing the luminescent system, generally, comprises the steps of modifying the surface of a nanostructured material to create isolated regions to act as luminescent centers and to create a charge imbalance on the surface; applying more than one polar molecule to the charged surface of the nanostructured material; and orienting the polar molecules to compensate for the charge imbalance on the surface of the nanostructured material. The compensation of the surface charge imbalance by the polar molecules allows the isolated regions to exhibit luminescence.

  5. The paradigm of kinematics and dynamics must yield to causal structure

    E-Print Network [OSTI]

    Robert W. Spekkens

    2012-08-31T23:59:59.000Z

    The distinction between a theory's kinematics and its dynamics, that is, between the space of physical states it posits and its law of evolution, is central to the conceptual framework of many physicists. A change to the kinematics of a theory, however, can be compensated by a change to its dynamics without empirical consequence, which strongly suggests that these features of the theory, considered separately, cannot have physical significance. It must therefore be concluded (with apologies to Minkowski) that henceforth kinematics by itself, and dynamics by itself, are doomed to fade away into mere shadows, and only a kind of union of the two will preserve an independent reality. The notion of causal structure seems to provide a good characterization of this union.

  6. Dynamics of Motivations

    E-Print Network [OSTI]

    Knoll, Jörn

    Dynamics of Resonances GSI, 18.05.2005 Motivations Thermal Equilibrium -N- vectormesons Di-leptons Towards dynamics Conserving -functional Gradient ap- proximation Quantum Kinetic Equation Summary Dynamics. Voskresensky1,3 1GSI 2Kurchatov Inst. (Moscow) 3Moscow Ins. for Physics and Engineering #12;Dynamics

  7. Dynamics on Lorentz manifolds

    E-Print Network [OSTI]

    Zeghib, Abdelghani

    Dynamics on Lorentz manifolds Abdelghani Zeghib Introduction Motivations and questions Examples Results Results Previous results Linear Dynamics General considerations Furstenberg Lemma Lorentz Dynamics://www.umpa.ens-lyon.fr/~zeghib/ (joint work with Paolo Piccione) #12;Dynamics on Lorentz manifolds Abdelghani Zeghib Introduction

  8. Introduction Basic dynamics

    E-Print Network [OSTI]

    LaCasce, Joseph H.

    Introduction Basic dynamics The Gulf Stream The thermohaline circulation Ocean currents: some misconceptions and some dynamics Joe LaCasce Dept. Geosciences October 30, 2012 Joe LaCasce Dept. Geosciences Ocean currents: some misconceptions and some dynamics #12;Introduction Basic dynamics The Gulf Stream

  9. assimilating seizure dynamics: Topics by E-print Network

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

    Observations with the Geosciences Websites Summary: ) by augmenting the observa- 1 The SSI was the operational 3D-Var data assimilation system of NCEP until April-A Level 1B...

  10. Decommissioning of U.S. Department of Energy surplus facilities under the Comprehensive Environmental Response, Compensation, and Liability Act

    SciTech Connect (OSTI)

    Warren, S. [Dept. of Energy, Germantown, MD (United States); Dorries, J. [Booz, Allen and Hamilton Inc., Germantown, MD (United States)

    1996-08-01T23:59:59.000Z

    The US Department of Energy (DOE) has identified more than 850 contaminated surplus facilities that require decommissioning through the environmental restoration program. This paper discusses the regulatory framework for decommissioning these facilities, specifically the framework established by the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). CERCLA jurisdiction covers releases of hazardous substances to the environment, substantial threats of such releases, and responses to these situations. DOE has determined that the use of CERCLA removal action authority is the appropriate means of responding to releases or threats of releases from contaminated surplus facilities under the jurisdiction, custody, or control of the Department. This paper focuses on the policy and process for decommissioning contaminated surplus facilities. Not all surplus facilities to be decommissioned will fall under CERCLA jurisdiction. In all instances, however, the same basic process will still be followed and a graded approach will be applied, consistent with DOE orders.

  11. Precise method of compensating radiation-induced errors in a hot-cathode-ionization gauge with correcting electrode

    SciTech Connect (OSTI)

    Saeki, Hiroshi, E-mail: saeki@spring8.or.jp; Magome, Tamotsu, E-mail: saeki@spring8.or.jp [Japan Synchrotron Radiation Research Institute, SPring-8, Kohto 1-1-1, Sayo, Hyogo 679-5198 (Japan)

    2014-10-06T23:59:59.000Z

    To compensate pressure-measurement errors caused by a synchrotron radiation environment, a precise method using a hot-cathode-ionization-gauge head with correcting electrode, was developed and tested in a simulation experiment with excess electrons in the SPring-8 storage ring. This precise method to improve the measurement accuracy, can correctly reduce the pressure-measurement errors caused by electrons originating from the external environment, and originating from the primary gauge filament influenced by spatial conditions of the installed vacuum-gauge head. As the result of the simulation experiment to confirm the performance reducing the errors caused by the external environment, the pressure-measurement error using this method was approximately less than several percent in the pressure range from 10{sup ?5} Pa to 10{sup ?8} Pa. After the experiment, to confirm the performance reducing the error caused by spatial conditions, an additional experiment was carried out using a sleeve and showed that the improved function was available.

  12. A general framework and review of scatter correction methods in x-ray cone-beam computerized tomography. Part 1: Scatter compensation approaches

    SciTech Connect (OSTI)

    Ruehrnschopf, Ernst-Peter; Klingenbeck, Klaus [Siemens AG, Healthcare Sector, Imaging and Therapy Division, Forchheim (Germany)

    2011-07-15T23:59:59.000Z

    Since scattered radiation in cone-beam volume CT implies severe degradation of CT images by quantification errors, artifacts, and noise increase, scatter suppression is one of the main issues related to image quality in CBCT imaging. The aim of this review is to structurize the variety of scatter suppression methods, to analyze the common structure, and to develop a general framework for scatter correction procedures. In general, scatter suppression combines hardware techniques of scatter rejection and software methods of scatter correction. The authors emphasize that scatter correction procedures consist of the main components scatter estimation (by measurement or mathematical modeling) and scatter compensation (deterministic or statistical methods). The framework comprises most scatter correction approaches and its validity also goes beyond transmission CT. Before the advent of cone-beam CT, a lot of papers on scatter correction approaches in x-ray radiography, mammography, emission tomography, and in Megavolt CT had been published. The opportunity to avail from research in those other fields of medical imaging has not yet been sufficiently exploited. Therefore additional references are included when ever it seems pertinent. Scatter estimation and scatter compensation are typically intertwined in iterative procedures. It makes sense to recognize iterative approaches in the light of the concept of self-consistency. The importance of incorporating scatter compensation approaches into a statistical framework for noise minimization has to be underscored. Signal and noise propagation analysis is presented. A main result is the preservation of differential-signal-to-noise-ratio (dSNR) in CT projection data by ideal scatter correction. The objective of scatter compensation methods is the restoration of quantitative accuracy and a balance between low-contrast restoration and noise reduction. In a synopsis section, the different deterministic and statistical methods are discussed with respect to their properties and applications. The current paper is focused on scatter compensation algorithms. The multitude of scatter estimation models will be dealt with in a separate paper.

  13. Some characteristics of dynamic pressure measurements in an internal combustion engine, and a method of compensation for the errors in the measuring system

    E-Print Network [OSTI]

    Norton, David Jerry

    1963-01-01T23:59:59.000Z

    , Therefore, rapid voltages appeared across the cell corresponding to each of the aluminum markers. One of the alum&num markers was made larger than the others. The increased Light reflected to the phoroconductive cell caused a smaller voltage drop across...

  14. Some characteristics of dynamic pressure measurements in an internal combustion engine, and a method of compensation for the errors in the measuring system 

    E-Print Network [OSTI]

    Norton, David Jerry

    1963-01-01T23:59:59.000Z

    ower load =0 40 b 0 p 9 -4. I 4. 2 4 ~ compreSSlo n r a?o FI 6 I 2, EFFI'C I ENC Y II S. COMPRESSION RATIO 17 Fig. 13. Schematic drawing of the mechanical system. The equation of motion for this familiar system is, ~ I NX + C(X-Y) + K(X-Y) = F...

  15. Tariffs with Dynamic Supply Response

    E-Print Network [OSTI]

    Karp, Larry

    1985-01-01T23:59:59.000Z

    Giannini FDN iibrary TARIFFS WITH DYNAMIC SUPPLY RESWNSEpaper studies the optimal tariff in a dynamic framework. Thesellers, the optimal tariff is dynam- ically inconsistent;

  16. Dynamics of structural priming 

    E-Print Network [OSTI]

    Malhotra, Gaurav

    2009-01-01T23:59:59.000Z

    for understanding various aspects of syntactic priming. Cognitive processes are modelled as dynamical systems that can change their behaviour when they process information. We use these dynamical systems to investigate how each episode of language comprehension...

  17. Categorical Introduction to Dynamical Systems Symbolic Dynamical Systems

    E-Print Network [OSTI]

    Kahng, Byung-Jay

    Categorical Introduction to Dynamical Systems Symbolic Dynamical Systems Symbolic Embedding Examples Results Embeddings in Symbolic Dynamical Systems Jonathan Jaquette Swarthmore College July 22, 2009 Jonathan Jaquette Embeddings in Symbolic Dynamical Systems #12;Categorical Introduction

  18. Dynamics of Carroll Particles

    E-Print Network [OSTI]

    Eric Bergshoeff; Joaquim Gomis; Giorgio Longhi

    2014-05-31T23:59:59.000Z

    We investigate particles whose dynamics is invariant under the Carroll group. Although a single free such Carroll particle has no non-trivial dynamics (`the Carroll particle does not move') we show that there exists non-trivial dynamics for a set of interacting Carroll particles. Furthermore, we gauge the Carroll algebra and couple the Carroll particle to these gauge fields. It turns out that for such a coupled system even a single Carroll particle can have non-trivial dynamics.

  19. Dynamics of Anisotropic Universes

    E-Print Network [OSTI]

    Jerome Perez

    2006-03-30T23:59:59.000Z

    We present a general study of the dynamical properties of Anisotropic Bianchi Universes in the context of Einstein General Relativity. Integrability results using Kovalevskaya exponents are reported and connected to general knowledge about Bianchi dynamics. Finally, dynamics toward singularity in Bianchi type VIII and IX universes are showed to be equivalent in some precise sence.

  20. Social Dynamics Introduction

    E-Print Network [OSTI]

    Barrett, Jeffrey A.

    Social Dynamics Introduction Part I: Correlation and the Social Contract Introduction to part I 1: University of Utah Press. 47-69. Part II: Importance of Dynamics Introduction to part II 1. Trust, Risk Significance of Some Simple Evolutionary Models (2000) Philosophy of Science 67: 94-113. 4. Dynamics

  1. Atmospheric Dynamics II Instructor

    E-Print Network [OSTI]

    AT602 Atmospheric Dynamics II 2 credits Instructor: David W. J. Thompson davet: An Introduction to Dynamic Meteorology, 5th Edition, Academic Press (recommended) · Marshall, J., and Plumb, R. A., 2008: Atmosphere, Ocean, and Climate Dynamics: An Introductory Text, Academic Press. · Vallis, G. K

  2. Intramolecular and nonlinear dynamics

    SciTech Connect (OSTI)

    Davis, M.J. [Argonne National Laboratory, IL (United States)

    1993-12-01T23:59:59.000Z

    Research in this program focuses on three interconnected areas. The first involves the study of intramolecular dynamics, particularly of highly excited systems. The second area involves the use of nonlinear dynamics as a tool for the study of molecular dynamics and complex kinetics. The third area is the study of the classical/quantum correspondence for highly excited systems, particularly systems exhibiting classical chaos.

  3. Cybersecurity Dynamics Shouhuai Xu

    E-Print Network [OSTI]

    Xu, Shouhuai

    Antonio ABSTRACT We explore the emerging field of Cybersecurity Dynamics, a candidate foundation been driving the study of security for decades -- the idea of cybersecurity dynamics emergedCybersecurity Dynamics Shouhuai Xu Department of Computer Science, University of Texas at San

  4. 17. METAPOPULATION DYNAMICS OF

    E-Print Network [OSTI]

    17. METAPOPULATION DYNAMICS OF INFECTIOUS DISEASES Matt J. Keeling, Ottar N. Bjørnstad, and Bryan T resonances for the dynamics of parasites. This is particularly true for microparasitic infections" growth of the parasite population. Thus, at the scale of the host popu- lation, infectious dynamics bears

  5. Slow dynamics and anomalous nonlinear fast dynamics in diverse solids

    E-Print Network [OSTI]

    Slow dynamics and anomalous nonlinear fast dynamics in diverse solids Paul Johnsona) Geophysics study of anomalous nonlinear fast dynamics and slow dynamics in a number of solids. Observations are presented from seven diverse materials showing that anomalous nonlinear fast dynamics ANFD and slow dynamics

  6. Dynamical friction in modified Newtonian dynamics

    E-Print Network [OSTI]

    C. Nipoti; L. Ciotti; J. Binney; P. Londrillo

    2008-03-31T23:59:59.000Z

    We have tested a previous analytical estimate of the dynamical friction timescale in Modified Newtonian Dynamics (MOND) with fully non-linear N-body simulations. The simulations confirm that the dynamical friction timescale is significantly shorter in MOND than in equivalent Newtonian systems, i.e. systems with the same phase-space distribution of baryons and additional dark matter. An apparent conflict between this result and the long timescales determined for bars to slow and mergers to be completed in previous N-body simulations of MOND systems is explained. The confirmation of the short dynamical-friction timescale in MOND underlines the challenge that the Fornax dwarf spheroidal poses to the viability of MOND.

  7. Efficient Algorithm for Locating and Sizing Series Compensation Devices in Large Transmission Grids: Model Implementation (PART 1)

    SciTech Connect (OSTI)

    Frolov, Vladimir [Moscow Inst. of Physics and Technology (MIPT), Moscow (Russian Federation); Backhaus, Scott N. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Chertkov, Michael [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2014-01-14T23:59:59.000Z

    We explore optimization methods for planning the placement, sizing and operations of Flexible Alternating Current Transmission System (FACTS) devices installed to relieve transmission grid congestion. We limit our selection of FACTS devices to Series Compensation (SC) devices that can be represented by modification of the inductance of transmission lines. Our master optimization problem minimizes the l1 norm of the inductance modification subject to the usual line thermal-limit constraints. We develop heuristics that reduce this non-convex optimization to a succession of Linear Programs (LP) which are accelerated further using cutting plane methods. The algorithm solves an instance of the MatPower Polish Grid model (3299 lines and 2746 nodes) in 40 seconds per iteration on a standard laptop—a speed up that allows the sizing and placement of a family of SC devices to correct a large set of anticipated congestions. We observe that our algorithm finds feasible solutions that are always sparse, i.e., SC devices are placed on only a few lines. In a companion manuscript, we demonstrate our approach on realistically-sized networks that suffer congestion from a range of causes including generator retirement. In this manuscript, we focus on the development of our approach, investigate its structure on a small test system subject to congestion from uniform load growth, and demonstrate computational efficiency on a realistically-sized network.

  8. Efficient Algorithm for Locating and Sizing Series Compensation Devices in Large Transmission Grids: Solutions and Applications (PART II)

    SciTech Connect (OSTI)

    Frolov, Vladimir [Moscow Inst. of Physics and Technology (MIPT), Moscow (Russian Federation); Backhaus, Scott N. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Chertkov, Michael [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2014-01-14T23:59:59.000Z

    In a companion manuscript, we developed a novel optimization method for placement, sizing, and operation of Flexible Alternating Current Transmission System (FACTS) devices to relieve transmission network congestion. Specifically, we addressed FACTS that provide Series Compensation (SC) via modification of line inductance. In this manuscript, this heuristic algorithm and its solutions are explored on a number of test cases: a 30-bus test network and a realistically-sized model of the Polish grid (~2700 nodes and ~3300 lines). The results on the 30-bus network are used to study the general properties of the solutions including non-locality and sparsity. The Polish grid is used as a demonstration of the computational efficiency of the heuristics that leverages sequential linearization of power flow constraints and cutting plane methods that take advantage of the sparse nature of the SC placement solutions. Using these approaches, the algorithm is able to solve an instance of Polish grid in tens of seconds. We explore the utility of the algorithm by analyzing transmission networks congested by (a) uniform load growth, (b) multiple overloaded configurations, and (c) sequential generator retirements

  9. Precision laser surveying instrument using atmospheric turbulence compensation by determining the absolute displacement between two laser beam components

    DOE Patents [OSTI]

    Veligdan, James T. (Manorville, NY)

    1993-01-01T23:59:59.000Z

    Atmospheric effects on sighting measurements are compensated for by adjusting any sighting measurements using a correction factor that does not depend on atmospheric state conditions such as temperature, pressure, density or turbulence. The correction factor is accurately determined using a precisely measured physical separation between two color components of a light beam (or beams) that has been generated using either a two-color laser or two lasers that project different colored beams. The physical separation is precisely measured by fixing the position of a short beam pulse and measuring the physical separation between the two fixed-in-position components of the beam. This precisely measured physical separation is then used in a relationship that includes the indexes of refraction for each of the two colors of the laser beam in the atmosphere through which the beam is projected, thereby to determine the absolute displacement of one wavelength component of the laser beam from a straight line of sight for that projected component of the beam. This absolute displacement is useful to correct optical measurements, such as those developed in surveying measurements that are made in a test area that includes the same dispersion effects of the atmosphere on the optical measurements. The means and method of the invention are suitable for use with either single-ended systems or a double-ended systems.

  10. Photovoltaic solar system connected to the electric power grid operating as active power generator and reactive power compensator

    SciTech Connect (OSTI)

    Albuquerque, Fabio L.; Moraes, Adelio J.; Guimaraes, Geraldo C.; Sanhueza, Sergio M.R.; Vaz, Alexandre R. [Universidade Federal de Uberlandia, Uberlandia-MG, CEP 38400-902 (Brazil)

    2010-07-15T23:59:59.000Z

    In the case of photovoltaic (PV) systems acting as distributed generation (DG) systems, the DC energy that is produced is fed to the grid through the power-conditioning unit (inverter). The majority of contemporary inverters used in DG systems are current source inverters (CSI) operating at unity power factor. If, however, we assume that voltage source inverters (VSI) can replace CSIs, we can generate reactive power proportionally to the remaining unused capacity at any given time. According to the theory of instantaneous power, the inverter reactive power can be regulated by changing the amplitude of its output voltage. In addition, the inverter active power can be adjusted by modifying the phase angle of its output voltage. Based on such theory, both the active power supply and the reactive power compensation (RPC) can be carried out simultaneously. When the insolation is weak or the PV modules are inoperative at night, the RPC feature of a PV system can still be used to improve the inverter utilisation factor. Some MATLAB simulation results are included here to show the feasibility of the method. (author)

  11. Equivalent Circuit Description of Non-compensated n-p Codoped TiO2 as Intermediate Band Solar Cells

    E-Print Network [OSTI]

    Tian-Li Feng; Guang-Wei Deng; Yi Xia; Feng-Cheng Wu; Ping Cui; Hai-Ping Lan; Zhen-Yu Zhang

    2010-12-09T23:59:59.000Z

    The novel concept of non-compensated n-p codoping has made it possible to create tunable intermediate bands in the intrinsic band gap of TiO2, making the codoped TiO2 a promising material for developing intermediate band solar cells (IBSCs). Here we investigate the quantum efficiency of such IBSCs within two scenarios - with and without current extracted from the extended intermediate band. Using the ideal equivalent circuit model, we find that the maximum efficiency of 57% in the first scenario and 53% in the second are both much higher than the Shockley-Queisser limit from single gap solar cells. We also obtain various key quantities of the circuits, a useful step in realistic development of TiO2 based solar cells invoking device integration. These equivalent circuit results are also compared with the efficiencies obtained directly from consideration of electron transition between the energy bands, and both approaches reveal the intriguing existence of double peaks in the maximum quantum efficiency as a function of the relative location of IBs.

  12. Equivalent Circuit Description of Non-compensated n-p Codoped TiO2 as Intermediate Band Solar Cells

    E-Print Network [OSTI]

    Feng, Tian-Li; Xia, Yi; Wu, Feng-Cheng; Cui, Ping; Lan, Hai-Ping; Zhang, Zhen-Yu

    2010-01-01T23:59:59.000Z

    The novel concept of non-compensated n-p codoping has made it possible to create tunable intermediate bands in the intrinsic band gap of TiO2, making the codoped TiO2 a promising material for developing intermediate band solar cells (IBSCs). Here we investigate the quantum efficiency of such IBSCs within two scenarios - with and without current extracted from the extended intermediate band. Using the ideal equivalent circuit model, we find that the maximum efficiency of 57% in the first scenario and 53% in the second are both much higher than the Shockley-Queisser limit from single gap solar cells. We also obtain various key quantities of the circuits, a useful step in realistic development of TiO2 based solar cells invoking device integration. These equivalent circuit results are also compared with the efficiencies obtained directly from consideration of electron transition between the energy bands, and both approaches reveal the intriguing existence of double peaks in the maximum quantum efficiency as a fun...

  13. 444 IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 14, NO. 4, APRIL 2002 Low-Threshold Strain-Compensated InGaAs(N)

    E-Print Network [OSTI]

    Gilchrist, James F.

    lasers utilizing strain-compensating InGaP­GaAsP buffer layers and GaAs0 85P0 15 barrier layers, grownGaAs lower cladding layers, are significantly improved through the use of an InGaP­GaAsP buffer layer. II As and p-In Ga P, respectively. Buffer layers of 2650-Å n-InGaP ( ppm), and 20-Å highly-tensile GaAs P

  14. Quantum dot lasers based on a stacked and strain-compensated active region grown by metal-organic chemical vapor deposition

    E-Print Network [OSTI]

    Jalali. Bahram

    successful to date. Kim et al. has embedded the QDs in an InGaP barrier,4 which results in high To=210 K reported improved crystallinity using InGaP strain- compensation SC layers, however, the InGaP layers can lead to In segregation and hexagonal material at the InGaP/GaAs interface.11 The use of InGaP and In

  15. Why do mixed quantum-classical methods describe short-time dynamics through conical intersections so well? Analysis of geometric phase effects

    E-Print Network [OSTI]

    Gherib, Rami; Izmaylov, Artur F

    2015-01-01T23:59:59.000Z

    Adequate simulation of non-adiabatic dynamics through conical intersection requires account for a non-trivial geometric phase (GP) emerging in electronic and nuclear wave-functions in the adiabatic representation. Popular mixed quantum-classical (MQC) methods, surface hopping and Ehrenfest, do not carry a nuclear wave-function to be able to incorporate the GP into nuclear dynamics. Surprisingly, the MQC methods reproduce ultra-fast interstate crossing dynamics generated with the exact quantum propagation so well as if they contained information about the GP. Using two-dimensional linear vibronic coupling models we unravel how the MQC methods can effectively mimic the most significant dynamical GP effects: 1) compensation for repulsive diagonal second order non-adiabatic couplings and 2) transfer enhancement for a fully cylindrically symmetric component of a nuclear distribution.

  16. M. Flierl: Coding of Multiview Imagery with Motion and Disparity Compensated Orthogonal Transforms, IEEE ICIP, San Antonio, TX, Sep. 2007. 1 CODING OF MULTIVIEW IMAGERY WITH MOTION AND DISPARITY

    E-Print Network [OSTI]

    Flierl, Markus

    that so called motion-compensated lifted wavelets may substantially deviate from orthonormality due to mo viewpoint video [1] to free viewpoint television (FTV) [2]. All of them require efficient coding

  17. Shape Dynamics. An Introduction

    E-Print Network [OSTI]

    Julian Barbour

    2011-05-01T23:59:59.000Z

    Shape dynamics is a completely background-independent universal framework of dynamical theories from which all absolute elements have been eliminated. For particles, only the variables that describe the shapes of the instantaneous particle configurations are dynamical. In the case of Riemannian three-geometries, the only dynamical variables are the parts of the metric that determine angles. The local scale factor plays no role. This leads to a shape-dynamic theory of gravity in which the four-dimensional diffeomorphism invariance of general relativity is replaced by three-dimensional diffeomorphism invariance and three-dimensional conformal invariance. Despite this difference of symmetry groups, it is remarkable that the predictions of the two theories -- shape dynamics and general relativity -- agree on spacetime foliations by hypersurfaces of constant mean extrinsic curvature. However, the two theories are distinct, with shape dynamics having a much more restrictive set of solutions. There are indications that the symmetry group of shape dynamics makes it more amenable to quantization and thus to the creation of quantum gravity. This introduction presents in simple terms the arguments for shape dynamics, its implementation techniques, and a survey of existing results.

  18. Dynamic Instruction Fusion

    E-Print Network [OSTI]

    Lee, Ian

    2012-01-01T23:59:59.000Z

    SANTA CRUZ DYNAMIC INSTRUCTION FUSION A thesis submitted in4 2.2 Instruction Fusion & Complex10 3.1 Fusion Selection

  19. Nanoindentation Under Dynamic Conditions

    E-Print Network [OSTI]

    Wheeler, Jeffrey M

    2009-05-22T23:59:59.000Z

    ............................................................................................ 98  6.3.1  Data Analysis ........................................................................................... 99  6.3.2  Dynamic Compliance ............................................................................. 103  6.3.3  Strain Rates...

  20. Intracellular shunting of O{sub 2}{sup ?} contributes to charge compensation and preservation of neutrophil respiratory burst in the absence of voltage-gated proton channel activity

    SciTech Connect (OSTI)

    Decleva, Eva [Department of Life Sciences, University of Trieste, Trieste (Italy); Menegazzi, Renzo, E-mail: menegazz@units.it [Department of Life Sciences, University of Trieste, Trieste (Italy); Fasolo, Alba [Department of Life Sciences, University of Trieste, Trieste (Italy); Defendi, Federica [Université Joseph Fourier, GREPI/AGIM CNRS FRE 3405, Grenoble (France); Sebastianutto, Michele; Dri, Pietro [Department of Life Sciences, University of Trieste, Trieste (Italy)

    2013-07-15T23:59:59.000Z

    Proton efflux via voltage-gated proton channels (Hv1) is considered to mediate the charge compensation necessary to preserve NADPH oxidase activity during the respiratory burst. Using the Hv1 inhibitor Zn{sup 2+}, we found that the PMA-induced respiratory burst of human neutrophils is inhibited when assessed as extracellular production of O{sub 2}{sup ?} and H{sub 2}O{sub 2}, in accordance with literature studies, but, surprisingly, unaffected when measured as oxygen consumption or total (extracellular plus intracellular) H{sub 2}O{sub 2} production. Furthermore, we show that inhibiting Hv1 with Zn{sup 2+} results in an increased production of intracellular ROS. Similar results, i.e. decreased extracellular and increased intracellular ROS production, were obtained using a human granulocyte-like cell line with severely impaired Hv1 expression. Acidic extracellular pH, which dampens proton efflux, also augmented intracellular production of H{sub 2}O{sub 2}. Zinc caused an increase in the rate but not in the extent of depolarization and cytosolic acidification indicating that mechanisms other than proton efflux take part in charge compensation. Our results suggest a hitherto unpredicted mechanism of charge compensation whereby, in the absence of proton efflux, part of O{sub 2}{sup ?} generated within gp91{sup phox} in the plasma membrane is shunted intracellularly down electrochemical gradient to dampen excessive depolarization. This would preserve NADPH oxidase activity under conditions such as the inflammatory exudate in which the acidic pH hinders charge compensation by proton efflux. Highlights: • Neutrophils’ respiratory burst is not inhibited by the H{sup +} channel inhibitor Zn{sup 2+}. • Intracellular production of O{sub 2}{sup ?} and H{sub 2}O{sub 2} is increased in the presence of Zn{sup 2+}. • Intracellular H{sub 2}O{sub 2} production is increased in H{sup +} channels knock-down cells. • Zn{sup 2+} increases the rate but not the extent of depolarization and pH{sub i} decrease. • Intracellular shunting of O{sub 2}{sup ?} contributes to charge compensation in neutrophils.

  1. Evaluation of plastic materials for range shifting, range compensation, and solid-phantom dosimetry in carbon-ion radiotherapy

    SciTech Connect (OSTI)

    Kanematsu, Nobuyuki; Koba, Yusuke; Ogata, Risa [Research Center for Charged Particle Therapy, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555 (Japan)

    2013-04-15T23:59:59.000Z

    Purpose: Beam range control is the essence of radiotherapy with heavy charged particles. In conventional broad-beam delivery, fine range adjustment is achieved by insertion of range shifting and compensating materials. In dosimetry, solid phantoms are often used for convenience. These materials should ideally be equivalent to water. In this study, the authors evaluated dosimetric water equivalence of four common plastics, high-density polyethylene (HDPE), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), and polyoxymethylene (POM). Methods: Using the Bethe formula for energy loss, the Gottschalk formula for multiple scattering, and the Sihver formula for nuclear interactions, the authors calculated the effective densities of the plastics for these interactions. The authors experimentally measured variation of the Bragg peak of carbon-ion beams by insertion of HDPE, PMMA, and POM, which were compared with analytical model calculations. Results: The theoretical calculation resulted in slightly reduced multiple scattering and severely increased nuclear interactions for HDPE, compared to water and the other plastics. The increase in attenuation of carbon ions for 20-cm range shift was experimentally measured to be 8.9% for HDPE, 2.5% for PMMA, and 0.0% for POM while PET was theoretically estimated to be in between PMMA and POM. The agreement between the measurements and the calculations was about 1% or better. Conclusions: For carbon-ion beams, POM was dosimetrically indistinguishable from water and the best of the plastics examined in this study. The poorest was HDPE, which would reduce the Bragg peak by 0.45% per cm range shift, although with marginal superiority for reduced multiple scattering. Between the two clear plastics, PET would be superior to PMMA in dosimetric water equivalence.

  2. Dynamic strength of concrete

    SciTech Connect (OSTI)

    Logunova, V.A.; Rudenko, V.V.; Radionov, A.K.; Sokolov, I.B.

    1994-12-01T23:59:59.000Z

    Recommendations for evaluating the dynamic strength of concrete structures at hydroelectric power stations are given. Both existing and planned structures are addressed. Equations are provided for determing the design compressive and tensile strength of concrete. A formula is provided for determining design dynamic strength of concrete of various ages under uniform compression. 3 refs., 1 fig., 2 tabs.

  3. 80 IEEE/ASME TRANSACTIONS ON MECHATRONICS, VOL. 16, NO. 1, FEBRUARY 2011 Modeling and Inverse Compensation of

    E-Print Network [OSTI]

    Tan, Xiaobo

    on temperature-dependent IPMC sensing dynamics. A cantilevered IPMC beam, soaked in a water bath with controlled, for extracting the mechanical signal given the sensor output. A stable but noncausal inversion algorithm harvesting [1]. Several important examples of EAPs include ionic polymer­metal composites (IPMCs) [2

  4. An electrical analog method for the compensation of indicator passage effects in pressure measurement and the determination of its limitations

    E-Print Network [OSTI]

    Lee, David Oi

    1964-01-01T23:59:59.000Z

    Characterist'cs of Dynamic Ppessure Measure- r:ants ir. an Internal Combustion Engine, and a Method of Com- pen ation for the Errors in the Measuring System, " M. S. Thesis, The A6 M Col!ege of Texas, August, 1963. Ktnsler, L. E. , and Frey, A, R...

  5. Off-line compensation of the tool path deviations on robotic machining: Application to Incremental Sheet Forming

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of industrial robots during an incremental sheet forming task. For that purpose, a robust and systematic method to reduce manufacturing costs and to improve production flexibility, the industrial robot manipulators industrial robots where only the TCP pose is controlled [12]. More- over, the dynamic parameters (inertia

  6. Relational Dynamic Bayesian Networks

    E-Print Network [OSTI]

    Domingos, P; Weld, D; 10.1613/jair.1625

    2011-01-01T23:59:59.000Z

    Stochastic processes that involve the creation of objects and relations over time are widespread, but relatively poorly studied. For example, accurate fault diagnosis in factory assembly processes requires inferring the probabilities of erroneous assembly operations, but doing this efficiently and accurately is difficult. Modeled as dynamic Bayesian networks, these processes have discrete variables with very large domains and extremely high dimensionality. In this paper, we introduce relational dynamic Bayesian networks (RDBNs), which are an extension of dynamic Bayesian networks (DBNs) to first-order logic. RDBNs are a generalization of dynamic probabilistic relational models (DPRMs), which we had proposed in our previous work to model dynamic uncertain domains. We first extend the Rao-Blackwellised particle filtering described in our earlier work to RDBNs. Next, we lift the assumptions associated with Rao-Blackwellization in RDBNs and propose two new forms of particle filtering. The first one uses abstracti...

  7. Jitter compensation circuit

    DOE Patents [OSTI]

    Sullivan, J.S.; Ball, D.G.

    1997-09-09T23:59:59.000Z

    The instantaneous V{sub co} signal on a charging capacitor is sampled and the charge voltage on capacitor C{sub o} is captured just prior to its discharge into the first stage of magnetic modulator. The captured signal is applied to an averaging circuit with a long time constant and to the positive input terminal of a differential amplifier. The averaged V{sub co} signal is split between a gain stage (G = 0.975) and a feedback stage that determines the slope of the voltage ramp applied to the high speed comparator. The 97.5% portion of the averaged V{sub co} signal is applied to the negative input of a differential amplifier gain stage (G = 10). The differential amplifier produces an error signal by subtracting 97.5% of the averaged V{sub co} signal from the instantaneous value of sampled V{sub co} signal and multiplying the difference by ten. The resulting error signal is applied to the positive input of a high speed comparator. The error signal is then compared to a voltage ramp that is proportional to the averaged V{sub co} values squared divided by the total volt-second product of the magnetic compression circuit. 11 figs.

  8. Power-Factor Compensation

    E-Print Network [OSTI]

    Stankoviæ, Aleksandar

    frequency. The phase shift arises largely due to energy flows characterizing electric motors that dominate IEEE CONTROL SYSTEMS MAGAZINE » APRIL 2007 1066-033X/07/$25.00©2007IEEE #12;A fundamental energy, where nonlinear phenomena cannot be neglected. These trends have resulted in the widespread presence

  9. Jitter compensation circuit

    DOE Patents [OSTI]

    Sullivan, James S. (Livermore, CA); Ball, Don G. (Livermore, CA)

    1997-01-01T23:59:59.000Z

    The instantaneous V.sub.co signal on a charging capacitor is sampled and the charge voltage on capacitor C.sub.o is captured just prior to its discharge into the first stage of magnetic modulator. The captured signal is applied to an averaging circuit with a long time constant and to the positive input terminal of a differential amplifier. The averaged V.sub. co signal is split between a gain stage (G=0.975) and a feedback stage that determines the slope of the voltage ramp applied to the high speed comparator. The 97.5% portion of the averaged V.sub.co signal is applied to the negative input of a differential amplifier gain stage (G=10). The differential amplifier produces an error signal by subtracting 97.5% of the averaged V.sub.co signal from the instantaneous value of sampled V.sub.co signal and multiplying the difference by ten. The resulting error signal is applied to the positive input of a high speed comparator. The error signal is then compared to a voltage ramp that is proportional to the averaged V.sub.co values squared divided by the total volt-second product of the magnetic compression circuit.

  10. Vegetation dynamics of a native haymeadow, a grazed meadow, and an oldfield within the San Antonio Prairie of Texas

    E-Print Network [OSTI]

    Hightower, Terry Paul

    1987-01-01T23:59:59.000Z

    Be ardii var. Be ardii, Bo t ious c~rti e d I var. c~rt( du(a, a d Carex icrundunt . Species of lua y soils lncl ded P~as alum plicatulum, Co lo his ~ilndrica, d P~I brist lis p b la . 8 berula. Launchbaugh (1955) studied succession on the San Antonio...

  11. SU-E-I-20: Dead Time Count Loss Compensation in SPECT/CT: Projection Versus Global Correction

    SciTech Connect (OSTI)

    Siman, W; Kappadath, S [UT MD Anderson Cancer Center, Houston, TX (United States)

    2014-06-01T23:59:59.000Z

    Purpose: To compare projection-based versus global correction that compensate for deadtime count loss in SPECT/CT images. Methods: SPECT/CT images of an IEC phantom (2.3GBq 99mTc) with ?10% deadtime loss containing the 37mm (uptake 3), 28 and 22mm (uptake 6) spheres were acquired using a 2 detector SPECT/CT system with 64 projections/detector and 15 s/projection. The deadtime, Ti and the true count rate, Ni at each projection, i was calculated using the monitor-source method. Deadtime corrected SPECT were reconstructed twice: (1) with projections that were individually-corrected for deadtime-losses; and (2) with original projections with losses and then correcting the reconstructed SPECT images using a scaling factor equal to the inverse of the average fractional loss for 5 projections/detector. For both cases, the SPECT images were reconstructed using OSEM with attenuation and scatter corrections. The two SPECT datasets were assessed by comparing line profiles in xyplane and z-axis, evaluating the count recoveries, and comparing ROI statistics. Higher deadtime losses (up to 50%) were also simulated to the individually corrected projections by multiplying each projection i by exp(-a*Ni*Ti), where a is a scalar. Additionally, deadtime corrections in phantoms with different geometries and deadtime losses were also explored. The same two correction methods were carried for all these data sets. Results: Averaging the deadtime losses in 5 projections/detector suffices to recover >99% of the loss counts in most clinical cases. The line profiles (xyplane and z-axis) and the statistics in the ROIs drawn in the SPECT images corrected using both methods showed agreement within the statistical noise. The count-loss recoveries in the two methods also agree within >99%. Conclusion: The projection-based and the global correction yield visually indistinguishable SPECT images. The global correction based on sparse sampling of projections losses allows for accurate SPECT deadtime loss correction while keeping the study duration reasonable.

  12. Los Alamos Dynamics Summer School

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

    School The Sixteenth Los Alamos Dynamics Summer School EXTENDED DEADLINES Los Alamos Dynamics Summer School Overview Contact Institute Director Charles Farrar (505) 663-5330...

  13. Studies in Nonlinear Dynamics & Econometrics

    E-Print Network [OSTI]

    Studies in Nonlinear Dynamics & Econometrics Volume 8, Issue 3 2004 Article 1 The Long Memory in Nonlinear Dynamics & Econometrics is produced by The Berkeley Electronic Press (bepress). http

  14. Dynamic Prediction of Concurrency Errors

    E-Print Network [OSTI]

    Sadowski, Caitlin

    2012-01-01T23:59:59.000Z

    Relation 15 Must-Before Race Prediction 16 Implementation 17viii Abstract Dynamic Prediction of Concurrency Errors bySANTA CRUZ DYNAMIC PREDICTION OF CONCURRENCY ERRORS A

  15. The Dynamical Challenge 

    E-Print Network [OSTI]

    Clark, Andy

    1997-01-01T23:59:59.000Z

    Recent studies such as Thelen and Smith (1994), Kelso (1995), Van Gelder (1995), Beer (1995), and others have presented a forceful case for a dynamical systems approach to understanding cognition and adaptive behavior. ...

  16. Dynamics in Formal Argumentation 

    E-Print Network [OSTI]

    Carbogim, Daniela Vasconcelos

    by constructing and weighing up arguements intended to give support in favour or against alternative conclusions. In dynamic argumentation, such arguements may be revised and strengthened in order yo increase to decrease the acceptability of controversial...

  17. Traffic Dynamic Instability

    E-Print Network [OSTI]

    Louis Reese; Anna Melbinger; Erwin Frey

    2015-05-05T23:59:59.000Z

    Here we study a driven lattice gas model for microtubule depolymerizing molecular motors, where traffic jams of motors induce stochastic switching between microtubule growth and shrinkage. We term this phenomenon \\enquote{traffic dynamic instability} because it is reminiscent of microtubule dynamic instability [T. Mitchison and M. Kirschner, Nature 312, 237 (1984)]. The intermittent dynamics of growth and shrinking emerges from the interplay between the arrival of motors at the microtubule tip, motor induced depolymerization, and motor detachment from the tip. The switching dynamics correlates with low and high motor density on the lattice. This leads to an effectively bistable particle density in the system. A refined domain wall theory predicts this transient appearance of different phases in the system. The theoretical results are supported by stochastic simulations.

  18. Traffic Dynamic Instability

    E-Print Network [OSTI]

    Reese, Louis; Frey, Erwin

    2015-01-01T23:59:59.000Z

    Here we study a driven lattice gas model for microtubule depolymerizing molecular motors, where traffic jams of motors induce stochastic switching between microtubule growth and shrinkage. We term this phenomenon \\enquote{traffic dynamic instability} because it is reminiscent of microtubule dynamic instability [T. Mitchison and M. Kirschner, Nature 312, 237 (1984)]. The intermittent dynamics of growth and shrinking emerges from the interplay between the arrival of motors at the microtubule tip, motor induced depolymerization, and motor detachment from the tip. The switching dynamics correlates with low and high motor density on the lattice. This leads to an effectively bistable particle density in the system. A refined domain wall theory predicts this transient appearance of different phases in the system. The theoretical results are supported by stochastic simulations.

  19. Dynamics of Nanoconfined Acetonitrile

    E-Print Network [OSTI]

    Norton, Cassandra

    2011-04-27T23:59:59.000Z

    The results of dynamics simulations of confined acetonitrile are presented. Confinement is achieved by filling previously formed silica pores having hydroxyl-terminated head groups with liquid acetonitrile. These pores are of the same nominal radius...

  20. Photochemical reaction dynamics

    SciTech Connect (OSTI)

    Moore, B.C. [Lawrence Berkeley Laboratory, Livermore, CA (United States)

    1993-12-01T23:59:59.000Z

    The purpose of the program is to develop a fundamental understanding of unimolecular and bimolecular reaction dynamics with application in combustion and energy systems. The energy dependence in ketene isomerization, ketene dissociation dynamics, and carbonyl substitution on organometallic rhodium complexes in liquid xenon have been studied. Future studies concerning unimolecular processes in ketene as well as energy transfer and kinetic studies of methylene radicals are discussed.

  1. The ethics of dynamic pricing

    SciTech Connect (OSTI)

    Faruqui, Ahmad

    2010-07-15T23:59:59.000Z

    Dynamic pricing has garnered much interest among regulators and utilities, since it has the potential for lowering energy costs for society. But the deployment of dynamic pricing has been remarkably tepid. The underlying premise is that dynamic pricing is unfair. But the presumption of unfairness in dynamic pricing rests on an assumption of fairness in today's tariffs. (author)

  2. CSE Master Specialization Fluid Dynamics

    E-Print Network [OSTI]

    Lang, Annika

    CSE Master Specialization Fluid Dynamics Course Semester Fluid Dynamics II HS Quantitative Flow Energie- und Verfahrenstechnik FS Biofluiddynamics FS #12;CSE in Fluid Dynamics: Very large high in Fluid Dynamics: Physiology of the inner ear MicroCT imaging Multilayer MFS for Stokes flow simulations

  3. Dynamics and Equilibria Sergiu Hart

    E-Print Network [OSTI]

    Dynamics and Equilibria Sergiu Hart Presidential Address, GAMES 2008 (July 2008) Revised and Expanded (November 2009) Revised (2010, 2011, 2012, 2013) SERGIU HART c 2008 ­ p. #12;DYNAMICS.D. Dissertation, Princeton 1950 SERGIU HART c 2008 ­ p. #12;Dynamics SERGIU HART c 2008 ­ p. #12;Dynamics FACT

  4. Dynamics of shared capitalism policies in a startup company by Joe C. Hsueh.

    E-Print Network [OSTI]

    Hsueh, Joe C. (Joe Chiao-Jen)

    2011-01-01T23:59:59.000Z

    Shared capitalism is a diverse set of compensation practices through which worker pay, or wealth, depends on the performance of the firm or work group; compensation practices include employee ownership, stock options, and ...

  5. Commissioning of a beta* knob for dynamic IR correction at RHIC

    SciTech Connect (OSTI)

    Robert-Demolaize G.; Marusic, A.; Tepikian, S.; White, S.

    2012-05-20T23:59:59.000Z

    In addition to the recent optics correction technique demonstrated at CERN and applied at RHIC, it is important to have a separate tool to control the value of the beta functions at the collision point ({beta}*). This becomes even more relevant when trying to reach high level of integrated luminosity while dealing with emittance blow-up over the length of a store, or taking advantage of compensation processes like stochastic cooling. Algorithms have been developed to allow modifying independently the beta function in each plane for each beam without significant increase in beam losses. The following reviews the principle of such algorithms and their experimental implementation as a dynamic {beta}-squeeze procedure.

  6. The Dynamical Discrete Web

    E-Print Network [OSTI]

    L. R. G. Fontes; C. M. Newman; K. Ravishankar; E. Schertzer

    2007-04-20T23:59:59.000Z

    The dynamical discrete web (DDW), introduced in recent work of Howitt and Warren, is a system of coalescing simple symmetric one-dimensional random walks which evolve in an extra continuous dynamical parameter s. The evolution is by independent updating of the underlying Bernoulli variables indexed by discrete space-time that define the discrete web at any fixed s. In this paper, we study the existence of exceptional (random) values of s where the paths of the web do not behave like usual random walks and the Hausdorff dimension of the set of such exceptional s. Our results are motivated by those about exceptional times for dynamical percolation in high dimension by H\\"aggstrom, Peres and Steif, and in dimension two by Schramm and Steif. The exceptional behavior of the walks in DDW is rather different from the situation for dynamical random walks of Benjamini, H\\"aggstrom, Peres and Steif. In particular, we prove that there are exceptional values of s for which the walk from the origin S^s(n) has limsup S^s(n)/\\sqrt n \\leq K with a nontrivial dependence of the Hausdorff dimension on K. We also discuss how these and other results extend to the dynamical Brownian web, a natural scaling limit of DDW. The scaling limit is the focus of a paper in preparation; it was studied by Howitt and Warren and is related to the Brownian net of Sun and Swart.

  7. Dynamical tunneling and control

    E-Print Network [OSTI]

    Srihari Keshavamurthy

    2011-07-25T23:59:59.000Z

    This article summarizes the recent work on the influence of dynamical tunneling on the control of quantum systems. Specifically, two examples are discussed. In the first, it is shown that the bichromatic control of tunneling in a driven double well system is hampered by the phenomenon of chaos-assisted tunneling. The bichromatic control landscape exhibits several regions indicating lack of control with every such region involving chaos-assisted tunneling. The second example illustrates the failure of controlling the dissociation dynamics of a driven Morse oscillator due to the phenomenon of resonance-assisted tunneling. In particular, attempts to control the dissociation dynamics by rebuilding local phase space barriers are foiled due to resonance-assisted tunneling.

  8. Dynamic Asset Sales with Information Externalities Sivan Frenkel

    E-Print Network [OSTI]

    Levit, Anna

    information about the rm's value. The information release aects a manager whose compensation is sensitive participants to learn more about the value of those rms. At the same time, managers' compensation in public rms not trade too aggressively on their information. 2Another example is earnings management using real

  9. Discovering Evolution Chains for Link Mining in Dynamic Networks

    E-Print Network [OSTI]

    Malerba, Donato

    : To question the need for size features and to propose a method that compensates their absence. Method: A baseline analogy-based estimation method (1NN) and a state-of-the-art learner (CART) are run on reduced of methods like pop1NN may compensate for size metrics with only a small loss in estimation accuracy

  10. High characteristics temperature of strain-compensated 1.3 {micro}m InAsP/InGaP/InP multi-quantum well lasers grown by all solid source molecular beam epitaxy

    SciTech Connect (OSTI)

    Savolainen, P.; Toivonen, M.; Salokatve, A. [Tampere Univ. of Technology (Finland). Dept. of Physics; Asonen, H. [Tutcore Ltd., Tampere (Finland); Murison, R. [EG and G Optoelectronics Canada, Vaudreuil, Quebec (Canada)

    1996-12-31T23:59:59.000Z

    The present lasers have very good characteristic temperature values for the threshold current. In order to maintain such performance in cw mode, one should either use narrow waveguide (buried) type of laser structure or reduce the number of QWs. If the number of QW`s is reduced, total gain decreases and this should be compensated by increasing the optical confinement factor. In this paper the authors have demonstrated the suitability of InAsP/InGaP strain-compensated system for high temperature lasers emitting 1.3 {micro}m and the potential of all solid source molecular beam epitaxy for growth of optoelectronic devices.

  11. Dynamics of black holes

    E-Print Network [OSTI]

    Sean A. Hayward

    2009-02-28T23:59:59.000Z

    This is a review of current theory of black-hole dynamics, concentrating on the framework in terms of trapping horizons. Summaries are given of the history, the classical theory of black holes, the defining ideas of dynamical black holes, the basic laws, conservation laws for energy and angular momentum, other physical quantities and the limit of local equilibrium. Some new material concerns how processes such as black-hole evaporation and coalescence might be described by a single trapping horizon which manifests temporally as separate horizons.

  12. Substructured multibody molecular dynamics.

    SciTech Connect (OSTI)

    Grest, Gary Stephen; Stevens, Mark Jackson; Plimpton, Steven James; Woolf, Thomas B. (Johns Hopkins University, Baltimore, MD); Lehoucq, Richard B.; Crozier, Paul Stewart; Ismail, Ahmed E.; Mukherjee, Rudranarayan M. (Rensselaer Polytechnic Institute, Troy, NY); Draganescu, Andrei I.

    2006-11-01T23:59:59.000Z

    We have enhanced our parallel molecular dynamics (MD) simulation software LAMMPS (Large-scale Atomic/Molecular Massively Parallel Simulator, lammps.sandia.gov) to include many new features for accelerated simulation including articulated rigid body dynamics via coupling to the Rensselaer Polytechnic Institute code POEMS (Parallelizable Open-source Efficient Multibody Software). We use new features of the LAMMPS software package to investigate rhodopsin photoisomerization, and water model surface tension and capillary waves at the vapor-liquid interface. Finally, we motivate the recipes of MD for practitioners and researchers in numerical analysis and computational mechanics.

  13. (Quantum Molecular Dynamics Method) (Classical Molecular Dynamics Method)

    E-Print Network [OSTI]

    Maruyama, Shigeo

    1-1 (Quantum Molecular Dynamics Method) (Classical Molecular Dynamics Method) 2) Verlet(Verlet's leap frog) (17)(18) ( ) i i ii m t t t t t t F vv + -= + 22 (17

  14. Biological Interactions and Dynamics Workshop | EMSL

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

    Biological Interactions and Dynamics Workshop Biological Interactions and Dynamics Workshop Wiley HS, Kaplan S. 2011. "Biological Interactions and Dynamics Science Theme Advisory...

  15. Introduction to Structure and Dynamics: Inaugural Issue

    E-Print Network [OSTI]

    White, Douglas R.; Manlove, Robert; Colby, B. N.; Garfias, Robert; Bell, Duran

    2005-01-01T23:59:59.000Z

    the premier issue of Structure and Dynamics, an electronicFor this great boon, Structure and Dynamics in particular iselectronic journals, Structure and Dynamics will be widely

  16. NEWS & VIEWS Glass dynamics

    E-Print Network [OSTI]

    Weeks, Eric R.

    NEWS & VIEWS Glass dynamics Diverging views on glass transition Gregory B. mc.mckenna@ttu.edu T he glass transition is one of the most intriguing phenomena in the world of soft condensed matter. Despite decades of study, many aspects of the behaviour of glass-forming liquids remain elusive

  17. Electronic Spectroscopy & Dynamics

    SciTech Connect (OSTI)

    Mark Maroncelli, Nancy Ryan Gray

    2010-06-08T23:59:59.000Z

    The Gordon Research Conference (GRC) on Electronic Spectroscopy and Dynamics was held at Colby College, Waterville, NH from 07/19/2009 thru 07/24/2009. The Conference was well-attended with participants (attendees list attached). The attendees represented the spectrum of endeavor in this field coming from academia, industry, and government laboratories, both U.S. and foreign scientists, senior researchers, young investigators, and students. The GRC on Electronic Spectroscopy & Dynamics showcases some of the most recent experimental and theoretical developments in electronic spectroscopy that probes the structure and dynamics of isolated molecules, molecules embedded in clusters and condensed phases, and bulk materials. Electronic spectroscopy is an important tool in many fields of research, and this GRC brings together experts having diverse backgrounds in physics, chemistry, biophysics, and materials science, making the meeting an excellent opportunity for the interdisciplinary exchange of ideas and techniques. Topics covered in this GRC include high-resolution spectroscopy, biological molecules in the gas phase, electronic structure theory for excited states, multi-chromophore and single-molecule spectroscopies, and excited state dynamics in chemical and biological systems.

  18. Tools for dynamic model development

    E-Print Network [OSTI]

    Schaber, Spencer Daniel

    2014-01-01T23:59:59.000Z

    For this thesis, several tools for dynamic model development were developed and analyzed. Dynamic models can be used to simulate and optimize the behavior of a great number of natural and engineered systems, from the ...

  19. This manuscript downloaded from www.microgrids.et.aau.dk is the preprint of the final paper: L. Meng, F. Tang, M. Savaghebi, J. C. Vasquez, and J. M. Guerrero, "Tertiary control of voltage unbalance compensation for optimal power quality in

    E-Print Network [OSTI]

    Vasquez, Juan Carlos

    distributed generators (DGs) equally share the compensation efforts. Tertiary control, which inherently in a multi-bus islanded system by optimally utilizing DGs as distributed compensators and saves. DG Distributed generation. E0 Rated voltage amplitude. E* Reference of voltage amplitude. fc Cut

  20. Edited by Lisa R. Girard. Last revised June 24, 2005. Published June 25, 2005. This chapter should be cited as: Meyer, B. J. X-Chromosome dosage compensation (June 25, 2005), WormBook, ed. The C. elegans Research Community, WormBook, doi/10.1895/wormbook.

    E-Print Network [OSTI]

    Meyer, Barbara

    should be cited as: Meyer, B. J. X-Chromosome dosage compensation (June 25, 2005), WormBook, ed. The C: © 2005 Barbara J. Meyer. This is an open-access article distributed under the terms of the Creative-mail: bjmeyer@berkeley.edu X-Chromosome dosage compensation* Barbara J. Meyer§ , Howard Hughes Medical Institute

  1. Dynamical entanglement versus symmetry and dynamics of classical approximations

    SciTech Connect (OSTI)

    Buric, Nikola [Department of Physics and Mathematics, Faculty of Pharmacy, University of Beograd, Vojvode Stepe 450, 11000 Belgrade (Serbia and Montenegro)

    2006-05-15T23:59:59.000Z

    It is shown that dynamical entanglement between two qubits depends on the symmetry of the quantum model. On the other hand, the latter is reflected in the qualitative properties of the dynamics of a classical approximation of the quantum system. For generic separable pure initial states, the dynamical entanglement is larger if the system is less symmetric and its classical approximation is chaotic. The influence of different types of Markov environments on the established relation between the dynamical entanglement, symmetry and the classical dynamics is also studied.

  2. Trade Liberalization And Poverty Dynamics

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Trade Liberalization And Poverty Dynamics in Vietnam 2002-2006 Barbara COELLO World Bank Madior-28Mar2014 #12;1 Trade liberalization and poverty dynamics in Vietnam 2002-2006 Barbara Coello, the World liberalization and poverty dynamics in Vietnam 2002-2006 Abstract This paper shows the evolution of poverty

  3. FLUCTUATIONS AND SIMPLE CHAOTIC DYNAMICS

    E-Print Network [OSTI]

    FLUCTUATIONS AND SIMPLE CHAOTIC DYNAMICS J.P. CRUTCHFIELD and J.D. FARMER Physics Board of Studies FLUCTUATIONS AND SIMPLE CHAOTIC DYNAMICS J.P. CRUTCHFIELD and J.D. FARMER* Physics Board of Studies, Universiiy anharmonic oscillator 76 2. Dynamics in the absence of fluctuations 48 Appendix B. Characteristic exponents

  4. Photodissociation Dynamics Laurie J. Butler*

    E-Print Network [OSTI]

    Butler, Laurie J.

    Photodissociation Dynamics Laurie J. Butler* Department of Chemistry, UniVersity of Chicago of photodissociation dynamics over the past 30 years are reviewed. An overview of experimental techniques that have of photodissociation dynamics has grown explo- sively in the past few decades. Spearheaded by developments in laser

  5. Centre de recherche KNOWLEDGE DYNAMICS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Centre de recherche KNOWLEDGE DYNAMICS DURING PLANNING PRACTICES MARIE-LÉANDRE GOMEZ DR09011 or part of this document without the written consent of the authors. - DR 09011 - Knowledge Dynamics Hirsch, BP5021, 95021 CERGY PONTOISE, France. E-mail: gomez@essec.fr I #12;Knowledge Dynamics During

  6. Galactic Dynamics James Binney and

    E-Print Network [OSTI]

    Landweber, Laura

    Galactic Dynamics James Binney and Scott Tremaine Two of the world's lead- ing astrophysicists describes our present un- derstanding of the struc- ture and dynamics of stellar systems such as galaxies and star clusters. Nicknamed "the Bible of galactic dynamics," this book has be- come a classic treatise

  7. PROPUESTA DE ACTIVIDAD TIC-VAR-005

    E-Print Network [OSTI]

    Autonoma de Madrid, Universidad

    ámbito rural de la provincia de Cabo Delgado, Mozambique PROGRAMA ISF en el que se enmarca Programa específico, sin que tenga necesariamente un fin académico. 2 TIC, Agua, Energía, Desarrollo Agropecuario y Mantenimiento de redes de telecomunicación en ámbitos rurales Sensibilidad a los proyectos de cooperación para

  8. Ostrya virginiana var. virginiana (Native) 2 

    E-Print Network [OSTI]

    Hugh D. Wilson

    2011-08-10T23:59:59.000Z

    A Phase I archeological assessment of a 20 acre tract in west-central Denton County, Texas was performed on November 11 and 12, 1998 by Brazos Valley Research Associates of Bryan, Texas. This project was conducted under Antiquities Permit 2078...

  9. mm-Wave Op-Amps employing simple-Miller compensation, with OIP3/PDC ratios of 211 (10 dB NF) and 144 (6.0 dB NF) at 2 GHz

    E-Print Network [OSTI]

    Rodwell, Mark J. W.

    mm-Wave Op-Amps employing simple-Miller compensation, with OIP3/PDC ratios of 211 (10 dB NF/PDC ratio at fs = 2-3 GHz, compared to state-of-the-art. We address considerations important 1000 mW power dissipation PDC . This very high ratio of output-referred third-order-intercept power

  10. FPGA Acceleration of Discrete Molecular Dynamics Simulation

    E-Print Network [OSTI]

    Herbordt, Martin

    ' & $ % FPGA Acceleration of Discrete Molecular Dynamics Simulation Joshua Model Thesis submitted UNIVERSITY COLLEGE OF ENGINEERING Thesis FPGA Acceleration of Discrete Molecular Dynamics Simulation Acceleration of Discrete Molecular Dynamics Simulation Joshua Model ABSTRACT Molecular dynamics simulation

  11. Mesoscale ocean dynamics modeling

    SciTech Connect (OSTI)

    mHolm, D.; Alber, M.; Bayly, B.; Camassa, R.; Choi, W.; Cockburn, B.; Jones, D.; Lifschitz, A.; Margolin, L.; Marsden, L.; Nadiga, B.; Poje, A.; Smolarkiewicz, P. [Los Alamos National Lab., NM (United States); Levermore, D. [Arizona Univ., Tucson, AZ (United States)

    1996-05-01T23:59:59.000Z

    This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The ocean is a very complex nonlinear system that exhibits turbulence on essentially all scales, multiple equilibria, and significant intrinsic variability. Modeling the ocean`s dynamics at mesoscales is of fundamental importance for long-time-scale climate predictions. A major goal of this project has been to coordinate, strengthen, and focus the efforts of applied mathematicians, computer scientists, computational physicists and engineers (at LANL and a consortium of Universities) in a joint effort addressing the issues in mesoscale ocean dynamics. The project combines expertise in the core competencies of high performance computing and theory of complex systems in a new way that has great potential for improving ocean models now running on the Connection Machines CM-200 and CM-5 and on the Cray T3D.

  12. Characterizing Microbial Community and Geochemical Dynamics at...

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

    Microbial Community and Geochemical Dynamics at Hydrothermal Vents Using Osmotically Driven Continuous Fluid Characterizing Microbial Community and Geochemical Dynamics at...

  13. Kuramoto dynamics in Hamiltonian systems

    E-Print Network [OSTI]

    Dirk Witthaut; Marc Timme

    2013-05-08T23:59:59.000Z

    The Kuramoto model constitutes a paradigmatic model for the dissipative collective dynamics of coupled oscillators, characterizing in particular the emergence of synchrony. Here we present a classical Hamiltonian (and thus conservative) system with 2N state variables that in its action-angle representation exactly yields Kuramoto dynamics on N-dimensional invariant manifolds. We show that the synchronization transition on a Kuramoto manifold emerges where the transverse Hamiltonian action dynamics becomes unstable. The uncovered Kuramoto dynamics in Hamiltonian systems thus distinctly links dissipative to conservative dynamics.

  14. Dynamical Methods in Algebra Dynamical Methods in Algebra [1] Dynamical Methods in Algebra

    E-Print Network [OSTI]

    Coquand, Thierry

    Dynamical Methods in Algebra Dynamical Methods in Algebra [1] Dynamical Methods in Algebra We present a possible realisation of Hilbert's program for (some part of) abstract algebra G in number theory) that cannot be eliminated Surprisingly this is not the case for abstract algebra 1 #12

  15. Dynamic radioactive particle source

    DOE Patents [OSTI]

    Moore, Murray E.; Gauss, Adam Benjamin; Justus, Alan Lawrence

    2012-06-26T23:59:59.000Z

    A method and apparatus for providing a timed, synchronized dynamic alpha or beta particle source for testing the response of continuous air monitors (CAMs) for airborne alpha or beta emitters is provided. The method includes providing a radioactive source; placing the radioactive source inside the detection volume of a CAM; and introducing an alpha or beta-emitting isotope while the CAM is in a normal functioning mode.

  16. Beam Dynamics for ARIA

    E-Print Network [OSTI]

    Ekdahl, Carl

    2015-01-01T23:59:59.000Z

    Beam dynamics issues are assessed for a new linear induction electron accelerator being designed for flash radiography of large explosively driven hydrodynamic experiments. Special attention is paid to equilibrium beam transport, possible emittance growth, and beam stability. It is concluded that a radiographic quality beam will be produced possible if engineering standards and construction details are equivalent to those on the present radiography accelerators at Los Alamos.

  17. Modal aerosol dynamics modeling

    SciTech Connect (OSTI)

    Whitby, E.R.; McMurry, P.H.; Shankar, U.; Binkowski, F.S.

    1991-02-01T23:59:59.000Z

    The report presents the governing equations for representing aerosol dynamics, based on several different representations of the aerosol size distribution. Analytical and numerical solution techniques for these governing equations are also reviewed. Described in detail is a computationally efficient numerical technique for simulating aerosol behavior in systems undergoing simultaneous heat transfer, fluid flow, and mass transfer in and between the gas and condensed phases. The technique belongs to a general class of models known as modal aerosol dynamics (MAD) models. These models solve for the temporal and spatial evolution of the particle size distribution function. Computational efficiency is achieved by representing the complete aerosol population as a sum of additive overlapping populations (modes), and solving for the time rate of change of integral moments of each mode. Applications of MAD models for simulating aerosol dynamics in continuous stirred tank aerosol reactors and flow aerosol reactors are provided. For the application to flow aerosol reactors, the discussion is developed in terms of considerations for merging a MAD model with the SIMPLER routine described by Patankar (1980). Considerations for incorporating a MAD model into the U.S. Environmental Protection Agency's Regional Particulate Model are also described. Numerical and analytical techniques for evaluating the size-space integrals of the modal dynamics equations (MDEs) are described. For multimodal logonormal distributions, an analytical expression for the coagulation integrals of the MDEs, applicable for all size regimes, is derived, and is within 20% of accurate numerical evaluation of the same moment coagulation integrals. A computationally efficient integration technique, based on Gauss-Hermite numerical integration, is also derived.

  18. Hamiltonian Dynamics of Preferential Attachment

    E-Print Network [OSTI]

    Zuev, Konstantin; Krioukov, Dmitri

    2015-01-01T23:59:59.000Z

    Prediction and control of network dynamics are grand-challenge problems in network science. The lack of understanding of fundamental laws driving the dynamics of networks is among the reasons why many practical problems of great significance remain unsolved for decades. Here we study the dynamics of networks evolving according to preferential attachment, known to approximate well the large-scale growth dynamics of a variety of real networks. We show that this dynamics is Hamiltonian, thus casting the study of complex networks dynamics to the powerful canonical formalism, in which the time evolution of a dynamical system is described by Hamilton's equations. We derive the explicit form of the Hamiltonian that governs network growth in preferential attachment. This Hamiltonian turns out to be nearly identical to graph energy in the configuration model, which shows that the ensemble of random graphs generated by preferential attachment is nearly identical to the ensemble of random graphs with scale-free degree d...

  19. Symmetries in open quantum dynamics

    E-Print Network [OSTI]

    Thomas F. Jordan

    2014-08-20T23:59:59.000Z

    Simple examples are used to introduce and examine a Heisenberg picture of symmetries of open quantum dynamics that can be described by unitary operators. When the symmetries are for Hamiltonian dynamics of an entire system, and the spectrum of the Hamiltonian operator has a lower bound, the symmetry operators commute with the Hamiltonian operator. An example shows that symmetry operators need not commute with the Hamiltonian operator when the spectrum of the Hamiltonian does not have a lower bound. There are many more symmetries that are only for the open dynamics of a subsystem and are described by unitary operators that do not commute with the Hamiltonian for the dynamics of the entire system. Examples show how these symmetries alone can reveal properties of the dynamics and reduce what needs to be done to work out the dynamics. A symmetry of the open dynamics of a subsystem can imply properties of the dynamics for the entire system that are not implied by the symmetries of the dynamics of the entire system. The symmetries are generally not related to constants of the motion for the open dynamics of the subsystem. There are symmetries of the open dynamics of a subsystem that depend only on the dynamics. In the simplest examples, these are also symmetries of the dynamics of the entire system. There are many more symmetries, of a new kind, that also depend on correlations, or absence of correlations, between the subsystem and the rest of the entire system, or on the state of the rest of the entire system. Symmetries that depend on correlations generally cannot be seen in the Schr\\"{o}dinger picture as symmetries of dynamical maps of density matrices for the subsystem.

  20. SDI: Statistical dynamic interactions

    SciTech Connect (OSTI)

    Blann, M.; Mustafa, M.G. (Lawrence Livermore National Lab., CA (USA)); Peilert, G.; Stoecker, H.; Greiner, W. (Frankfurt Univ. (Germany, F.R.). Inst. fuer Theoretische Physik)

    1991-04-01T23:59:59.000Z

    We focus on the combined statistical and dynamical aspects of heavy ion induced reactions. The overall picture is illustrated by considering the reaction {sup 36}Ar + {sup 238}U at a projectile energy of 35 MeV/nucleon. We illustrate the time dependent bound excitation energy due to the fusion/relaxation dynamics as calculated with the Boltzmann master equation. An estimate of the mass, charge and excitation of an equilibrated nucleus surviving the fast (dynamic) fusion-relaxation process is used as input into an evaporation calculation which includes 20 heavy fragment exit channels. The distribution of excitations between residue and clusters is explicitly calculated, as is the further deexcitation of clusters to bound nuclei. These results are compared with the exclusive cluster multiplicity measurements of Kim et al., and are found to give excellent agreement. We consider also an equilibrated residue system at 25% lower initial excitation, which gives an unsatisfactory exclusive multiplicity distribution. This illustrates that exclusive fragment multiplicity may provide a thermometer for system excitation. This analysis of data involves successive binary decay with no compressional effects nor phase transitions. Several examples of primary versus final (stable) cluster decay probabilities for an A = 100 nucleus at excitations of 100 to 800 MeV are presented. From these results a large change in multifragmentation patterns may be understood as a simple phase space consequence, invoking neither phase transitions, nor equation of state information. These results are used to illustrate physical quantities which are ambiguous to deduce from experimental fragment measurements. 14 refs., 4 figs.

  1. Dynamics of Charged Events

    SciTech Connect (OSTI)

    Bachas, Constantin [Laboratoire de Physique Theorique de l'Ecole Normale Superieure, 24 rue Lhomond, 75231 Paris cedex (France); Bunster, Claudio [Centro de Estudios Cientificos (CECS), Avenida Arturo Prat 514, Valdivia (Chile); Henneaux, Marc [Physique Theorique et Mathematique, Universite Libre de Bruxelles and International Solvay Institutes, ULB Campus Plaine C.P. 231, 1050 Bruxelles (Belgium); Centro de Estudios Cientificos (CECS), Avenida Arturo Prat 514, Valdivia (Chile)

    2009-08-28T23:59:59.000Z

    In three spacetime dimensions the world volume of a magnetic source is a single point, an event. We make the event dynamical by regarding it as the imprint of a flux-carrying particle impinging from an extra dimension. This can be generalized to higher spacetime dimensions and to extended events. We exhibit universal observable consequences of the existence of events and argue that events are as important as particles or branes. We explain how events arise on the world volume of membranes in M theory, and in a Josephson junction in superconductivity.

  2. Dynamic Transfer Limits Study

    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 for4,645 3,625govInstrumentstdmadapInactiveVisitingContract ManagementDiscovering HowAnaDynamic Switching of the Spin

  3. Coarse Grained Quantum Dynamics

    E-Print Network [OSTI]

    Cesar Agon; Vijay Balasubramanian; Skyler Kasko; Albion Lawrence

    2014-12-09T23:59:59.000Z

    We consider coarse graining a quantum system divided between short distance and long distance degrees of freedom, which are coupled by the Hamiltonian. Observations using purely long distance observables can be described by the reduced density matrix that arises from tracing out the short-distance observables. The dynamics of this density matrix is that of an open quantum system, and is nonlocal in time, on the order of some short time scale. We describe these dynamics in a model system with a simple hierarchy of energy gaps $\\Delta E_{UV} > \\Delta E_{IR}$, in which the coupling between high-and low-energy degrees of freedom is treated to second order in perturbation theory. We then describe the equations of motion under suitable time averaging, reflecting the limited time resolution of actual experiments, and find an expansion of the master equation in powers of $\\Delta E_{IR}/\\Delta E_{UV}$, in which the failure of the system to be Hamiltonian or even Markovian appears at higher orders in this ratio. We compute the evolution of the density matrix in two specific examples -- coupled spins, and linearly coupled simple harmonic oscillators. Finally, we discuss the evolution of the density matrix using the path integral approach, computing the Feynman-Vernon influence functional for the IR degrees of freedom in perturbation theory, and argue that this influence functional is the correct analog of the Wilsonian effective action for this problem.

  4. Cosmological dynamical systems

    E-Print Network [OSTI]

    Genly Leon; Carlos R. Fadragas

    2014-12-18T23:59:59.000Z

    In this book are studied, from the perspective of the dynamical systems, several Universe models. In chapter 1 we give a bird's eye view on cosmology and cosmological problems. Chapter 2 is devoted to a brief review on some results and useful tools from the qualitative theory of dynamical systems. They provide the theoretical basis for the qualitative study of concrete cosmological models. Chapters 1 and 2 are a review of well-known results. Chapters 3, 4, 5 and 6 are devoted to our main results. In these chapters are extended and settled in a substantially different, more strict mathematical language, several results obtained by one of us in arXiv:0812.1013 [gr-qc]; arXiv:1009.0689 [gr-qc]; arXiv:0904.1577[gr-qc]; and arXiv:0909.3571 [hep-th]. In chapter 6, we provide a different approach to the subject discussed in astro-ph/0503478. Additionally, we perform a Poincar\\'e compactification process allowing to construct a global phase space containing all the cosmological information in both finite and infinite regions for all the models.

  5. Topics in Quantum Dynamics

    E-Print Network [OSTI]

    A. Jadczyk

    1994-06-30T23:59:59.000Z

    The paper consists of two parts. In the first part Schroedinger's equation for a charged quantum particle in a Galilei-Newton curved space-time is derived in a fully geometrical way. Gravitational and electromagnetic fields are coded into space metric and space-time connection. The fundamental geometrical object is a quantum connection in a Hermitian line bundle over the 7-dimensional jet space of 3-velocities. The secondary object is the bundle of Hilbert spaces over absolute time. Time appears as a superselection quantity while Shroedinger equation is interpreted as parallel transport in this bundle. In the second part the problem of measurement in quantum theory is discussed as a part of a more general problem of coupling between quantum and classical systems. The standard framework of quantum theory is extended so as to allow for dynamical central observables within dissipative dynamics. It is shown that within this approach one obtains not only Liouville equation that describes statistical ensembles, but also a piecewise-deterministic random process describing sequences of "events" that can be monitored by a continuous observation of the single, coupled classical system. It also describes "quantum jumps" or "wave packet reductions" that accompany these events. Two example are worked out in some details. The last one deals with the problem oof "how to determine the wave function ?".

  6. Dynamic Chirality in Nuclei

    SciTech Connect (OSTI)

    Tonev, D. [Institute for Nuclear Research and Nuclear Energy, BAS, 1784 Sofia (Bulgaria); INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro (Italy); Angelis, G. de [INFN, Laboratori Nazionali di Legnaro, 35020 Legnaro (Italy); Brant, S. [Department of Physics, Faculty of Science, University of Zagreb, 10000 Zagreb (Croatia); Petkov, P. [Institute for Nuclear Research and Nuclear Energy, BAS, 1784 Sofia (Bulgaria); Ventura, A. [ENEA, 40129 Bologna and INFN, Sezione di Bologna (Italy)

    2009-08-26T23:59:59.000Z

    The possible chiral interpretation of twin bands in odd-odd nuclei was investigated in the Interacting Boson Fermion-Fermion Model. The analysis of the wave functions has shown that the possibility for angular momenta of the valence proton, neutron and core to find themselves in the favorable, almost orthogonal geometry is present, but not dominant. Such behaviour is found to be similar in nuclei where both the level energies and the electromagnetic decay properties display the chiral pattern, as well as in those where only the energies of the corresponding levels in the twin bands are close together. The difference in the structure of the two types of chiral candidates nuclei can be attributed to different beta and gamma fluctuations, induced by the exchange boson-fermion interaction of the Interacting Boson Fermion-Fermion Model. In both cases the chirality is weak and dynamic. The existence of doublets of bands in {sup 134}Pr can be attributed to dynamic chirality dominated by shape fluctuations.

  7. Nuclear Matter and Nuclear Dynamics

    E-Print Network [OSTI]

    M Colonna

    2009-02-26T23:59:59.000Z

    Highlights on the recent research activity, carried out by the Italian Community involved in the "Nuclear Matter and Nuclear Dynamics" field, will be presented.

  8. Particle Dynamics And Emergent Gravity

    E-Print Network [OSTI]

    Amir H. Fatollahi

    2008-05-08T23:59:59.000Z

    The emergent gravity proposal is examined within the framework of noncommutative QED/gravity correspondence from particle dynamics point of view.

  9. Three-nucleon interactions: dynamics

    E-Print Network [OSTI]

    M. R. Robilotta

    2008-03-04T23:59:59.000Z

    A discussion is presented of the dynamics underlying three-body nuclear forces, with emphasis on changes which occurred over several decades.

  10. Los Alamos Dynamics Summer School

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

    School The Sixteenth Los Alamos Dynamics Summer School Program Information and Application Process Contact Institute Director Charles Farrar (505) 663-5330 Email Professional Staff...

  11. LANL | Physics | Dynamic Plutonium Experiments

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

    Dynamic plutonium experiments Since the end of nuclear testing the nation has had to rely on sophisticated computer models to ensure the safety and reliability of the nuclear...

  12. Comprehensive Environmental Response, Compensation, and Liability Act, as amended by the Superfund Amendments and Reauthorization Act Section 120(e)(5). Annual report to Congress for Fiscal year 1992

    SciTech Connect (OSTI)

    Not Available

    1993-08-01T23:59:59.000Z

    The US Department of Energy (DOE) is committed to conducting its operations in a safe and environmentally sound manner. High priorities for the Department are identifying and correcting environmental problems at DOE facilities that resulted from past operations, and preventing environmental problems from occurring during present and future operations. In this regard, the Department is committed to clean up the 1989 inventory of sites in the Environmental Restoration Program by the year 2019. DOE has issued an Order and guidance establishing policy and procedures for activities conducted under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), as amended by the Superfund Amendments and Reauthorization Act (SARA), and has developed a Five-Year Plan, updated annually, that integrates planning for corrective activities, environmental restoration and waste management operations at its facilities. DOE also continues to conduct assessments (e.g., Management Audits, Environmental Safety and Health (ES & H) Progress Assessments, Internal Self Assessments) at its operating facilities to provide the Secretary of Energy with information on current environmental compliance status and follow-up on findings.

  13. Hazard Ranking System evaluation of CERCLA (Comprehensive Environmental Response, Compensation, and Liability Act) inactive waste sites at Hanford: Volume 1, Evaluation methods and results

    SciTech Connect (OSTI)

    Stenner, R.D.; Cramer, K.H.; Higley, K.A.; Jette, S.J.; Lamar, D.A.; McLaughlin, T.J.; Sherwood, D.R.; Van Houten, N.C.

    1988-10-01T23:59:59.000Z

    The purpose of this report is to formally document the individual site Hazard Ranking System (HRS) evaluations conducted as part of the preliminary assessment/site inspection (PA/SI) activities at the US Department of Energy (DOE) Hanford Site. These activities were carried out pursuant to the DOE orders that describe the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) Program addressing the cleanup of inactive waste sites. These orders incorporate the US Environmental Protection Agency methodology, which is based on the Superfund Amendments and Reauthorization Act of 1986 (SARA). The methodology includes six parts: PA/SI, remedial investigation/feasibility study, record of decision, design and implementation of remedial action, operation and monitoring, and verification monitoring. Volume 1 of this report discusses the CERCLA inactive waste-site evaluation process, assumptions, and results of the HRS methodology employed. Volume 2 presents the data on the individual CERCLA engineered-facility sites at Hanford, as contained in the Hanford Inactive Site Surveillance (HISS) Data Base. Volume 3 presents the data on the individual CERCLA unplanned-release sites at Hanford, as contained in the HISS Data Base. 34 refs., 43 figs., 47 tabs.

  14. Fiscal year 1996 progress in implementing Section 120 of the Comprehensive Environmental Response, Compensation, and Liability Act. Tenth annual report to Congress

    SciTech Connect (OSTI)

    NONE

    1997-12-01T23:59:59.000Z

    Congress passed the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) (Public Law 96-510), commonly known as Superfund, in 1980. The Superfund Amendments and Reauthorization Act (SARA) (Public Law 99-499), which amended CERCLA in 1986, added Section 120 regarding the cleanup of contaminated sites at Federal facilities. Under Section 120(e)(5) of CERCLA, each department, agency, or instrumentality of the Federal government responsible for compliance with Section 120 must submit an annual report to Congress concerning its progress in implementing the requirements of Section 120. The report must include information on the progress in reaching Interagency Agreements (IAGs), conducting remedial investigation and feasibility studies (RI/FSs), and performing remedial actions. Federal agencies that own or operate facilities on the National Priorities List (NPL) are required to begin an RI/FS for these facilities within 6 months after being placed on the NPL. Remediation of these facilities is addressed in an IAG between the Federal agency, the US Environmental Protection Agency (EPA), and in some instances the state within which the facility is located.

  15. Fiscal year 1995 progress in implementing Section 120 of the Comprehensive Environmental Response, Compensation, and Liability Act. Ninth annual report to Congress

    SciTech Connect (OSTI)

    NONE

    1996-09-01T23:59:59.000Z

    Congress passed the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) (Public Law 96-510), commonly known as Superfund, in 1980. The Superfund Amendments and Reauthorization Act (SARA) which amended CERCLA in 1986, added Section 120 regarding the cleanup of contaminated sites at Federal facilities. Under Section 120(e)(5) of CERCLA, each department, agency, or instrumentality of the Federal government responsible for compliance with Section 120 must submit an annual report to Congress concerning its progress in implementing the requirements of Section 120. The report must include information on the progress in reaching Interagency Agreements (IAGs), conducting Remedial Investigation and Feasibility Studies (RI/FSs), and performing remedial action. Federal agencies that own or operate facilities on the National priorities List (NPL) are required to begin an RI/FS for these facilities within 6 months after being placed on the NPL. Remediation of these facilities is addressed in an IAG between the Federal agency, the US Environmental Protection Agency (EPA), and in some instances the state within which the facility is located. This report provides the status of ongoing activities being performed in support of CERCLA Section 120 at DOE facilities. This includes activities conducted to reach IAGs and progress in conducting remedial actions.

  16. Dynamical Transition and Heterogeneous Hydration Dynamics in RNA

    E-Print Network [OSTI]

    Jeseong Yoon; Jong-Chin Lin; Changbong Hyeon; D. Thirumalai

    2014-04-24T23:59:59.000Z

    Enhanced dynamical fluctuations of RNAs, facilitated by a network of water molecules with strong interactions with RNA, are suspected to be critical in their ability to respond to a variety of cellular signals. Using atomically detailed molecular dynamics simulations at various temperatures of purine (adenine)- and preQ$_1$ sensing riboswitch aptamers, we show that water molecules in the vicinity of RNAs undergo complex dynamics depending on the local structures of the RNAs. The overall lifetimes of hydrogen bonds (HBs) of surface bound waters are more than at least 1-2 orders of magnitude longer than bulk water. Slow hydration dynamics, revealed in non-Arrhenius behavior of the relaxation time, arises from high activation barriers to break water hydrogen bonds with a nucleotide and by reduced diffusion of water. The relaxation kinetics at specific locations in the two RNAs show a broad spectrum of time scales reminiscent of glass-like behavior, suggesting that the hydration dynamics is highly heterogeneous. Both RNAs undergo dynamic transition at $T = T_D \\gtrsim 200$ K as assessed by the mean square fluctuation of hydrogen atoms $\\langle x^2\\rangle$, which undergoes an abrupt harmonic-to-anharmonic transition at $T_D$. The near universal value of $T_D$ found for these RNAs and previously for tRNA is strongly correlated with changes in hydration dynamics as $T$ is altered. Hierarchical dynamics of waters associated with the RNA surface, revealed in the motions of distinct classes of water with well-separated time scales, reflects the heterogeneous local environment on the molecular surface of RNA. At low temperatures slow water dynamics predominates over structural transitions. Our study demonstrates that the complex interplay of dynamics between water and local environment in the RNA structures could be a key determinant of the functional activities of RNA.

  17. Probing Single-Molecule Protein Conformational Dynamics. | EMSL

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

    Single-Molecule Protein Conformational Dynamics. Probing Single-Molecule Protein Conformational Dynamics. Abstract: Protein conformational fluctuations and dynamics, often...

  18. Hamiltonian Dynamics of Preferential Attachment

    E-Print Network [OSTI]

    Konstantin Zuev; Fragkiskos Papadopoulos; Dmitri Krioukov

    2015-04-29T23:59:59.000Z

    Prediction and control of network dynamics are grand-challenge problems in network science. The lack of understanding of fundamental laws driving the dynamics of networks is among the reasons why many practical problems of great significance remain unsolved for decades. Here we study the dynamics of networks evolving according to preferential attachment, known to approximate well the large-scale growth dynamics of a variety of real networks. We show that this dynamics is Hamiltonian, thus casting the study of complex networks dynamics to the powerful canonical formalism, in which the time evolution of a dynamical system is described by Hamilton's equations. We derive the explicit form of the Hamiltonian that governs network growth in preferential attachment. This Hamiltonian turns out to be nearly identical to graph energy in the configuration model, which shows that the ensemble of random graphs generated by preferential attachment is nearly identical to the ensemble of random graphs with scale-free degree distributions. In other words, preferential attachment generates nothing but random graphs with power-law degree distribution. The extension of the developed canonical formalism for network analysis to richer geometric network models with non-degenerate groups of symmetries may eventually lead to a system of equations describing network dynamics at small scales.

  19. Perturbation Theory for Population Dynamics

    E-Print Network [OSTI]

    Francisco M. Fernandez

    2007-12-20T23:59:59.000Z

    We prove that a recently proposed homotopy perturbation method for the treatment of population dynamics is just the Taylor expansion of the population variables about initial time. Our results show that this perturbation method fails to provide the global features of the ecosystem dynamics.

  20. Effective equations for quantum dynamics

    E-Print Network [OSTI]

    Benjamin Schlein

    2012-08-01T23:59:59.000Z

    We report on recent results concerning the derivation of effective evolution equations starting from many body quantum dynamics. In particular, we obtain rigorous derivations of nonlinear Hartree equations in the bosonic mean field limit, with precise bounds on the rate of convergence. Moreover, we present a central limit theorem for the fluctuations around the Hartree dynamics.

  1. Status of dynamical ensemble generation

    E-Print Network [OSTI]

    Chulwoo Jung

    2010-01-06T23:59:59.000Z

    I give an overview of current and future plans of dynamical QCD ensemble generation activities. A comparison of simulation cost between different discretizations is made. Recent developments in techniques and algorithms used in QCD dynamical simulations, especially mass reweighting, are also discussed.

  2. Hierarchical Adaptive Dynamic Power Management

    E-Print Network [OSTI]

    Chen, Yuanzhu Peter

    Hierarchical Adaptive Dynamic Power Management Zhiyuan Ren, Member, IEEE, Bruce H. Krogh, Fellow, IEEE, and Radu Marculescu, Member, IEEE Abstract--Dynamic power management aims at extending battery management strategies can lead to poor performance or unnecessary power consumption when there are wide

  3. Environment-induced dynamical chaos

    E-Print Network [OSTI]

    Bidhan Chandra Bag; Deb Shankar Ray

    2000-05-18T23:59:59.000Z

    We examine the interplay of nonlinearity of a dynamical system and thermal fluctuation of its environment in the ``physical limit'' of small damping and slow diffusion in a semiclassical context and show that the trajectories of c-number variables exhibit dynamical chaos due to the thermal fluctuations of the bath.

  4. Anomalous diffusion of Ga and As from semi-insulating GaAs substrate into MOCVD grown ZnO films as a function of annealing temperature and its effect on charge compensation

    SciTech Connect (OSTI)

    Biswas, Pranab; Banerji, P., E-mail: pallab@matsc.iitkgp.ernet.in [Materials Science Centre, Indian Institute of Technology, Kharagpur 721 302 (India); Halder, Nripendra N. [Advanced Technology Development Centre, Indian Institute of Technology, Kharagpur 721 302 (India)] [Advanced Technology Development Centre, Indian Institute of Technology, Kharagpur 721 302 (India); Kundu, Souvik [School of Electrical Engineering and Computer Science, Oregon State University, 1148 Kelley Engineering Center, Corvallis, OR 97331–5501 (United States)] [School of Electrical Engineering and Computer Science, Oregon State University, 1148 Kelley Engineering Center, Corvallis, OR 97331–5501 (United States); Shripathi, T.; Gupta, M. [UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452 001 (India)] [UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452 001 (India)

    2014-05-15T23:59:59.000Z

    The diffusion behavior of arsenic (As) and gallium (Ga) atoms from semi-insulating GaAs (SI-GaAs) into ZnO films upon post-growth annealing vis-à-vis the resulting charge compensation was investigated with the help of x-ray photoelectron spectroscopy (XPS) and secondary ion mass spectroscopy. The films, annealed at 600 ºC and 700 ºC showed p-type conductivity with a hole concentration of 1.1 × 10{sup 18} cm{sup ?3} and 2.8 × 10{sup 19} cm{sup ?3} respectively, whereas those annealed at 800 ºC showed n-type conductivity with a carrier concentration of 6.5 × 10{sup 16} cm{sup ?3}. It is observed that at lower temperatures, large fraction of As atoms diffused from the SI-GaAs substrates into ZnO and formed acceptor related complex, (As{sub Zn}–2V{sub Zn}), by substituting Zn atoms (As{sub Zn}) and thereby creating two zinc vacancies (V{sub Zn}). Thus as-grown ZnO which was supposed to be n-type due to nonstoichiometric nature showed p-type behavior. On further increasing the annealing temperature to 800 ºC, Ga atoms diffused more than As atoms and substitute Zn atoms thereby forming shallow donor complex, Ga{sub Zn}. Electrons from donor levels then compensate the p-type carriers and the material reverts back to n-type. Thus the conversion of carrier type took place due to charge compensation between the donors and acceptors in ZnO and this compensation is the possible origin of anomalous conduction in wide band gap materials.

  5. FPGA ACCELERATION OF MOLECULAR DYNAMICS SIMULATIONS

    E-Print Network [OSTI]

    Herbordt, Martin

    ' & $ % FPGA ACCELERATION OF MOLECULAR DYNAMICS SIMULATIONS YONGFENG GU Dissertation submitted;BOSTON UNIVERSITY COLLEGE OF ENGINEERING Dissertation FPGA ACCELERATION OF MOLECULAR DYNAMICS SIMULATIONS DYNAMICS SIMULATIONS (Order No. ) YONGFENG GU Boston University, College of Engineering, 2008 Major

  6. Characterization of majorization monotone quantum dynamics

    E-Print Network [OSTI]

    Haidong Yuan

    2015-03-25T23:59:59.000Z

    In this article I study the dynamics of open quantum system in Markovian environment. I give necessary and sufficient conditions for such dynamics to be majorization monotone, which are those dynamics always mixing the states.

  7. Reptational dynamics in dissipative particle dynamics simulations of polymer melts

    E-Print Network [OSTI]

    P. Nikunen; I. Vattulainen; M. Karttunen

    2005-12-12T23:59:59.000Z

    Understanding the complex viscoelastic properties of polymeric liquids remains a challenge in materials science and soft matter physics. Here, we present a simple and computationally efficient criterion for the topological constraints in polymeric liquids using the Dissipative Particle Dynamics (DPD). The same approach is also applicable in other soft potential models. For short chains the model correctly reproduces Rouse-like dynamics whereas for longer chains the dynamics becomes reptational as the chain length is increased - something that is not attainable using standard DPD or other coarse-grained soft potential methods. Importantly, no new length scales or forces need to be added.

  8. Protein Dynamics Hit the Big Screen

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

    Protein Dynamics Hit the Big Screen Protein Dynamics Hit the Big Screen Now playing at a supercomputer near you: proteins in action June 29, 2005 Contact: Dan Krotz,...

  9. Laser Driven Dynamic Loading of Condensed Matter

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

    Laser Driven Dynamic Loading of Condensed Matter Laser Driven Dynamic Loading of Condensed Matter Advanced diagnostics of experiments covering many orders of magnitude in strain...

  10. Structure, Charge Distribution, and Electron Hopping Dynamics...

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

    Charge Distribution, and Electron Hopping Dynamics in Magnetite (Fe3O4) (100) Surfaces from First Principles. Structure, Charge Distribution, and Electron Hopping Dynamics in...

  11. Los Alamos Dynamics Summer School Projects

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

    School-Overview Los Alamos Dynamics Summer School Projects Los Alamos Dynamics Summer School Projects and Resources Contact Institute Director Charles Farrar (505) 663-5330 Email...

  12. Dynamic stall on wind turbine blades

    SciTech Connect (OSTI)

    Butterfield, C.P.; Simms, D.; Scott, G. [National Renewable Energy Lab., Golden, CO (United States)] [National Renewable Energy Lab., Golden, CO (United States); Hansen, A.C. [Utah Univ., Salt Lake City, UT (United States)] [Utah Univ., Salt Lake City, UT (United States)

    1991-12-01T23:59:59.000Z

    Dynamic loads must be predicted accurately in order to estimate the fatigue life of wind turbines operating in turbulent environments. Dynamic stall contributes to increased dynamic loads during normal operation of all types of horizontal-axis wind turbine (HAWTs). This report illustrates how dynamic stall varies throughout the blade span of a 10 m HAWT during yawed and unyawed operating conditions. Lift, drag, and pitching moment coefficients during dynamics stall are discussed. Resulting dynamic loads are presented, and the effects of dynamic stall on yaw loads are demonstrated using a yaw loads dynamic analysis (YAWDYN). 12 refs., 22 figs., 1 tab.

  13. 16.07 Dynamics, Fall 2004

    E-Print Network [OSTI]

    Peraire, Jaume

    Dynamics starts with fundamentals of Newtonian mechanics. Further topics include kinematics, particle dynamics, motion relative to accelerated reference frames, work and energy, impulse and momentum, systems of particles ...

  14. Development of a Dynamic DOE Calibration Model

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

    cell characterization * Train and validate dynamic models * Apply models for system optimization Results * Dynamic emissions models have been developed (validation error on the...

  15. Comprehensive ecosystem model-experiment synthesis using multiple datasets at two temperate forest free-air CO2 enrichment experiments: model performance and compensating biases

    SciTech Connect (OSTI)

    Walker, Anthony P [ORNL] [ORNL; Hanson, Paul J [ORNL] [ORNL; DeKauwe, Martin G [Macquarie University] [Macquarie University; Medlyn, Belinda [Macquarie University] [Macquarie University; Zaehle, S [Max Planck Institute for Biogeochemistry] [Max Planck Institute for Biogeochemistry; Asao, Shinichi [Colorado State University, Fort Collins] [Colorado State University, Fort Collins; Dietze, Michael [University of Illinois, Urbana-Champaign] [University of Illinois, Urbana-Champaign; Hickler, Thomas [Goethe University, Frankfurt, Germany] [Goethe University, Frankfurt, Germany; Huntinford, Chris [Centre for Ecology and Hydrology, Wallingford, United Kingdom] [Centre for Ecology and Hydrology, Wallingford, United Kingdom; Iversen, Colleen M [ORNL] [ORNL; Jain, Atul [University of Illinois, Urbana-Champaign] [University of Illinois, Urbana-Champaign; Lomas, Mark [University of Sheffield] [University of Sheffield; Luo, Yiqi [University of Oklahoma] [University of Oklahoma; McCarthy, Heather R [Duke University] [Duke University; Parton, William [Colorado State University, Fort Collins] [Colorado State University, Fort Collins; Prentice, I. Collin [Macquarie University] [Macquarie University; Thornton, Peter E [ORNL] [ORNL; Wang, Shusen [Canada Centre for Remote Sensing (CCRS)] [Canada Centre for Remote Sensing (CCRS); Wang, Yingping [CSIRO Marine and Atmospheric Research] [CSIRO Marine and Atmospheric Research; Warlind, David [Lund University, Sweden] [Lund University, Sweden; Weng, Ensheng [University of Oklahoma, Norman] [University of Oklahoma, Norman; Warren, Jeffrey [ORNL] [ORNL; Woodward, F. Ian [University of Sheffield] [University of Sheffield; Oren, Ram [Duke University] [Duke University; Norby, Richard J [ORNL] [ORNL

    2014-01-01T23:59:59.000Z

    Free Air CO2 Enrichment (FACE) experiments provide a remarkable wealth of data to test the sensitivities of terrestrial ecosystem models (TEMs). In this study, a broad set of 11 TEMs were compared to 22 years of data from two contrasting FACE experiments in temperate forests of the south eastern US the evergreen Duke Forest and the deciduous Oak Ridge forest. We evaluated the models' ability to reproduce observed net primary productivity (NPP), transpiration and Leaf Area index (LAI) in ambient CO2 treatments. Encouragingly, many models simulated annual NPP and transpiration within observed uncertainty. Daily transpiration model errors were often related to errors in leaf area phenology and peak LAI. Our analysis demonstrates that the simulation of LAI often drives the simulation of transpiration and hence there is a need to adopt the most appropriate of hypothesis driven methods to simulate and predict LAI. Of the three competing hypotheses determining peak LAI (1) optimisation to maximise carbon export, (2) increasing SLA with canopy depth and (3) the pipe model the pipe model produced LAI closest to the observations. Modelled phenology was either prescribed or based on broader empirical calibrations to climate. In some cases, simulation accuracy was achieved through compensating biases in component variables. For example, NPP accuracy was sometimes achieved with counter-balancing biases in nitrogen use efficiency and nitrogen uptake. Combined analysis of parallel measurements aides the identification of offsetting biases; without which over-confidence in model abilities to predict ecosystem function may emerge, potentially leading to erroneous predictions of change under future climates.

  16. Fiscal Year 1994 progress in implementing Section 120 of the Comprehensive Environmental Rresponse, Compensation, and Liability Act. Eighth annual report to Congress

    SciTech Connect (OSTI)

    NONE

    1995-07-01T23:59:59.000Z

    Congress passed the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) (Public Law 96-510), commonly known as Superfund, in 1980. The Superfund Amendments and Reauthorization Act (SARA) (Public Law 99-499), which amended CERCLA in 1986, added Section 120 regarding the cleanup of contaminated sites at Federal facilities. Under Section 120(e)(5) of CERCLA, each department, agency, or instrumentality of the Federal government responsible for compliance with Section 120 must submit an annual report to Congress concerning its progress in implementing the requirements of Section 120. The report must include information on the progress in reaching Interagency Agreements (IAGs), conducting Remedial Investigation and Feasibility Studies (RI/FSs), and performing remedial actions. Federal agencies that own or operate facilities on the National Priorities List (NPL) are required to begin an RI/FS for these facilities within 6 months after being placed on the NPL. Remediation of these facilities is addressed in an IAG between the Federal agency, the U.S. Environmental Protection Agency (EPA), and in some instances the state within which the facility is located. This report, prepared by the U.S. Department of Energy`s (DOE`s) Office of Environmental Management, is being submitted to Congress in accordance with Section 120(e)(5) of CERCLA. It is DOE`s Eighth Annual Report to Congress and provides information on DOE`s progress in implementing CERCLA Section 120 in Fiscal Year 1994 (FY 94), i.e., from October 1, 1993, to September 30, 1994. In this report the words {open_quotes}site{close_quotes} and {open_quotes}facility{close_quotes} are used interchangeably.

  17. Fermionic Molecular Dynamics for nuclear dynamics and thermodynamics

    E-Print Network [OSTI]

    K. H. O. Hasnaoui; Ph. Chomaz; F. Gulminelli

    2008-12-02T23:59:59.000Z

    A new Fermionic Molecular Dynamics (FMD) model based on a Skyrme functional is proposed in this paper. After introducing the basic formalism, some first applications to nuclear structure and nuclear thermodynamics are presented

  18. Collective dynamics in sparse networks

    E-Print Network [OSTI]

    Stefano Luccioli; Simona Olmi; Antonio Politi; Alessandro Torcini

    2012-08-03T23:59:59.000Z

    The microscopic and macroscopic dynamics of random networks is investigated in the strong-dilution limit (i.e. for sparse networks). By simulating chaotic maps, Stuart-Landau oscillators, and leaky integrate-and-fire neurons, we show that a finite connectivity (of the order of a few tens) is able to sustain a nontrivial collective dynamics even in the thermodynamic limit. Although the network structure implies a non-additive dynamics, the microscopic evolution is extensive (i.e. the number of active degrees of freedom is proportional to the number of network elements).

  19. Dynamics of generalized tachyon field

    E-Print Network [OSTI]

    Rong-Jia Yang; Jingzhao Qi

    2012-08-06T23:59:59.000Z

    We investigate the dynamics of generalized tachyon field in FRW spacetime. We obtain the autonomous dynamical system for the general case. Because the general autonomous dynamical system cannot be solved analytically, we discuss two cases in detail: $\\beta=1$ and $\\beta=2$. We find the critical points and study their stability. At these critical points, we also consider the stability of the generalized tachyon field, which is as important as the stability of critical points. The possible final states of the universe are discussed.

  20. Chromospheric Dynamics and Line Formation

    E-Print Network [OSTI]

    R. Hammer; P. Ulmschneider

    2007-07-14T23:59:59.000Z

    The solar chromosphere is very dynamic, due to the presence of large amplitude hydrodynamic waves. Their propagation is affected by NLTE radiative transport in strong spectral lines, which can in turn be used to diagnose the dynamics of the chromosphere. We give a basic introduction into the equations of NLTE radiation hydrodynamics and describe how they are solved in current numerical simulations. The comparison with observation shows that one-dimensional codes can describe strong brightenings quite well, but the overall chromospheric dynamics appears to be governed by three-dimensional shock propagation.

  1. Dynamic simulation of voltage collapses

    SciTech Connect (OSTI)

    Deuse, J.; Stubbe, M. (Tractebel, Brussels (Belgium))

    1993-08-01T23:59:59.000Z

    Most of the time the voltage collapse phenomena are studied by means of computer programs designed for the calculation of steady state conditions. But in the real world, the simultaneous occurrences of losses of synchronism, of AVR dynamics or of transformer tap changes call for a full dynamic simulation of voltage phenomena. The present paper shows some examples of dynamic simulations of voltage phenomena using a new general purpose stability program (EUROSTAG), covering in a continuous way the classical fields of transient, mid-term and long-term stability, and also the quasi steady state conditions of a power system.

  2. Connecting curves for dynamical systems

    E-Print Network [OSTI]

    R. Gilmore; Jean-Marc Ginoux; Timothy Jones; C. Letellier; U. S. Freitas

    2010-03-08T23:59:59.000Z

    We introduce one dimensional sets to help describe and constrain the integral curves of an $n$ dimensional dynamical system. These curves provide more information about the system than the zero-dimensional sets (fixed points) do. In fact, these curves pass through the fixed points. Connecting curves are introduced using two different but equivalent definitions, one from dynamical systems theory, the other from differential geometry. We describe how to compute these curves and illustrate their properties by showing the connecting curves for a number of dynamical systems.

  3. Fractal dynamics of earthquakes

    SciTech Connect (OSTI)

    Bak, P.; Chen, K. [Brookhaven National Lab., Upton, NY (United States). Dept. of Physics

    1995-05-01T23:59:59.000Z

    Many objects in nature, from mountain landscapes to electrical breakdown and turbulence, have a self-similar fractal spatial structure. It seems obvious that to understand the origin of self-similar structures, one must understand the nature of the dynamical processes that created them: temporal and spatial properties must necessarily be completely interwoven. This is particularly true for earthquakes, which have a variety of fractal aspects. The distribution of energy released during earthquakes is given by the Gutenberg-Richter power law. The distribution of epicenters appears to be fractal with dimension D {approx} 1--1.3. The number of after shocks decay as a function of time according to the Omori power law. There have been several attempts to explain the Gutenberg-Richter law by starting from a fractal distribution of faults or stresses. But this is a hen-and-egg approach: to explain the Gutenberg-Richter law, one assumes the existence of another power-law--the fractal distribution. The authors present results of a simple stick slip model of earthquakes, which evolves to a self-organized critical state. Emphasis is on demonstrating that empirical power laws for earthquakes indicate that the Earth`s crust is at the critical state, with no typical time, space, or energy scale. Of course the model is tremendously oversimplified; however in analogy with equilibrium phenomena they do not expect criticality to depend on details of the model (universality).

  4. On quantum potential dynamics

    E-Print Network [OSTI]

    Sheldon Goldstein; Ward Struyve

    2014-11-05T23:59:59.000Z

    Non-relativistic de Broglie-Bohm theory describes particles moving under the guidance of the wave function. In de Broglie's original formulation, the particle dynamics is given by a first-order differential equation. In Bohm's reformulation, it is given by Newton's law of motion with an extra potential that depends on the wave function--the quantum potential--together with a constraint on the possible velocities. It was recently argued, mainly by numerical simulations, that relaxing this velocity constraint leads to a physically untenable theory. We provide further evidence for this by showing that for various wave functions the particles tend to escape the wave packet. In particular, we show that for a central classical potential and bound energy eigenstates the particle motion is often unbounded. This work seems particularly relevant for ways of simulating wave function evolution based on Bohm's formulation of the de Broglie-Bohm theory. Namely, the simulations may become unstable due to deviations from the velocity constraint.

  5. Computational fluid dynamic applications

    SciTech Connect (OSTI)

    Chang, S.-L.; Lottes, S. A.; Zhou, C. Q.

    2000-04-03T23:59:59.000Z

    The rapid advancement of computational capability including speed and memory size has prompted the wide use of computational fluid dynamics (CFD) codes to simulate complex flow systems. CFD simulations are used to study the operating problems encountered in system, to evaluate the impacts of operation/design parameters on the performance of a system, and to investigate novel design concepts. CFD codes are generally developed based on the conservation laws of mass, momentum, and energy that govern the characteristics of a flow. The governing equations are simplified and discretized for a selected computational grid system. Numerical methods are selected to simplify and calculate approximate flow properties. For turbulent, reacting, and multiphase flow systems the complex processes relating to these aspects of the flow, i.e., turbulent diffusion, combustion kinetics, interfacial drag and heat and mass transfer, etc., are described in mathematical models, based on a combination of fundamental physics and empirical data, that are incorporated into the code. CFD simulation has been applied to a large variety of practical and industrial scale flow systems.

  6. Dynamics of neural cryptography

    SciTech Connect (OSTI)

    Ruttor, Andreas; Kinzel, Wolfgang; Kanter, Ido [Institut fuer Theoretische Physik, Universitaet Wuerzburg, Am Hubland, 97074 Wuerzburg (Germany); Minerva Center and Department of Physics, Bar Ilan University, Ramat Gan 52900 (Israel)

    2007-05-15T23:59:59.000Z

    Synchronization of neural networks has been used for public channel protocols in cryptography. In the case of tree parity machines the dynamics of both bidirectional synchronization and unidirectional learning is driven by attractive and repulsive stochastic forces. Thus it can be described well by a random walk model for the overlap between participating neural networks. For that purpose transition probabilities and scaling laws for the step sizes are derived analytically. Both these calculations as well as numerical simulations show that bidirectional interaction leads to full synchronization on average. In contrast, successful learning is only possible by means of fluctuations. Consequently, synchronization is much faster than learning, which is essential for the security of the neural key-exchange protocol. However, this qualitative difference between bidirectional and unidirectional interaction vanishes if tree parity machines with more than three hidden units are used, so that those neural networks are not suitable for neural cryptography. In addition, the effective number of keys which can be generated by the neural key-exchange protocol is calculated using the entropy of the weight distribution. As this quantity increases exponentially with the system size, brute-force attacks on neural cryptography can easily be made unfeasible.

  7. ICFA Beam Dynamics Newsletter

    SciTech Connect (OSTI)

    Ben-Zvi I.; Kuczewski A.; Altinbas, Z.; Beavis, D.; Belomestnykh,; Dai, J. et al

    2012-07-01T23:59:59.000Z

    The Collider-Accelerator Department at Brookhaven National Laboratory is building a high-brightness 500 mA capable Energy Recovery Linac (ERL) as one of its main R&D thrusts towards eRHIC, the polarized electron - hadron collider as an upgrade of the operating RHIC facility. The ERL is in final assembly stages, with injection commisioning starting in October 2012. The objective of this ERL is to serve as a platform for R&D into high current ERL, in particular issues of halo generation and control, Higher-Order Mode (HOM) issues, coherent emissions for the beam and high-brightness, high-power beam generation and preservation. The R&D ERL features a superconducting laser-photocathode RF gun with a high quantum efficiency photoccathode served with a load-lock cathode delivery system, a highly damped 5-cell accelerating cavity, a highly flexible single-pass loop and a comprehensive system of beam instrumentation. In this ICFA Beam Dynamics Newsletter article we will describe the ERL in a degree of detail that is not usually found in regular publications. We will discuss the various systems of the ERL, following the electrons from the photocathode to the beam dump, cover the control system, machine protection etc and summarize with the status of the ERL systems.

  8. Compensating Customer-Generators: A taxonomy describing methods of compensating

    E-Print Network [OSTI]

    Hughes, Larry

    , investment in grid-connected generation capacity is growing at a faster rate than off-grid applications (IEA

  9. Scalability of dynamic traffic assignment

    E-Print Network [OSTI]

    Wen, Yang, Ph. D. Massachusetts Institute of Technology

    2009-01-01T23:59:59.000Z

    This research develops a systematic approach to analyze the computational performance of Dynamic Traffic Assignment (DTA) models and provides solution techniques to improve their scalability for on-line applications for ...

  10. Queuing models System dynamics models

    E-Print Network [OSTI]

    Glushko, Robert J.

    models Value chain models Business Model / Organizational Perspective Process Perspective Information#12;#12;#12;#12;Queuing models System dynamics models #12;#12;#12;#12;Blueprint or touchpoint

  11. THz Dynamic Nuclear Polarization NMR

    E-Print Network [OSTI]

    Nanni, Emilio Alessandro

    Dynamic nuclear polarization (DNP) increases the sensitivity of nuclear magnetic resonance (NMR) spectroscopy by using high frequency microwaves to transfer the polarization of the electrons to the nuclear spins. The ...

  12. Gas-phase chemical dynamics

    SciTech Connect (OSTI)

    Weston, R.E. Jr.; Sears, T.J.; Preses, J.M. [Brookhaven National Laboratory, Upton, NY (United States)

    1993-12-01T23:59:59.000Z

    Research in this program is directed towards the spectroscopy of small free radicals and reactive molecules and the state-to-state dynamics of gas phase collision, energy transfer, and photodissociation phenomena. Work on several systems is summarized here.

  13. The power of dynamic pricing

    SciTech Connect (OSTI)

    Faruqui, Ahmad; Hledik, Ryan; Tsoukalis, John

    2009-04-15T23:59:59.000Z

    Using data from a generic California utility, it can be shown that it is feasible to develop dynamic pricing rates for all customer classes. These rates have the potential to reduce system peak demands from 1 to 9 percent. (author)

  14. Qubit dynamics under alternating controls

    E-Print Network [OSTI]

    Aiello, Clarice Demarchi

    2014-01-01T23:59:59.000Z

    In this thesis, we discuss two problems of quantum dynamics in the presence of alternating controls. Alternating controls arise in many protocols designed to extend the duration over which a qubit is a useful computational ...

  15. Dynamic Unawareness and Rationalizable Behavior

    E-Print Network [OSTI]

    Niebur, Ernst

    Dynamic Unawareness and Rationalizable Behavior Aviad Heifetz Martin Meier Burkhard C. Schipper 2007, LOFT 2008, Games 2008 and NSF/NBER/CEME 2009, and UECE Lisbon 2010. Aviad is grateful

  16. Nuclear dynamics induced by antiprotons

    E-Print Network [OSTI]

    Zhao-Qing Feng

    2015-05-20T23:59:59.000Z

    Reaction dynamics in collisions of antiprotons on nuclei is investigated within the Lanzhou quantum molecular dynamics model. The reaction channels of elastic scattering, annihilation, charge exchange and inelastic collisions of antiprotons on nucleons have been included in the model. Dynamics on particle production, in particular pions, kaons, antikaons and hyperons, is investigated in collisions of $\\overline{p}$ on $^{12}$C, $^{20}$Ne, $^{40}$Ca and $^{181}$Ta from a low to high incident momenta. It is found that the annihilations of $\\overline{p}$ on nucleons are of importance on the dynamics of particle production in phase space. Hyperons are mainly produced via meson induced reactions on nucleons and strangeness exchange collisions, which lead to the delayed emission in antiproton-nucleus collisions.

  17. Actin Dynamics in Aspergillus nidulans

    E-Print Network [OSTI]

    Quintanilla, Laura

    2013-04-08T23:59:59.000Z

    Actin is a major cytoskeletal protein required for the polarized growth of filamentous fungi. Recent studies have characterized the dynamics of actin polymers in growing Neurospora crassa and identified the presence of actin patches, cables...

  18. Tactic behaviors in bacterial dynamics

    E-Print Network [OSTI]

    Sekora, Michael David

    2005-01-01T23:59:59.000Z

    The locomotion of a wide class of motile bacteria can be mathematically described as a biased random walk in three-dimensional space. Fluid mechanics and probability theory are invoked to model the dynamics of bacteria ...

  19. Rotational dynamics of entangled polymers

    E-Print Network [OSTI]

    Jean-Charles Walter; Michiel Laleman; Marco Baiesi; Enrico Carlon

    2014-09-01T23:59:59.000Z

    Some recent results on the rotational dynamics of polymers are reviewed and extended. We focus here on the relaxation of a polymer, either flexible or semiflexible, initially wrapped around a rigid rod. We also study the steady polymer rotation generated by a constant torque on the rod. The interplay of frictional and entropic forces leads to a complex dynamical behavior characterized by non-trivial universal exponents. The results are based on extensive simulations of polymers undergoing Rouse dynamics and on an analytical approach using force balance and scaling arguments. The analytical results are in general in good agreement with the simulations, showing how a simplified approach can correctly capture the complex dynamical behavior of rotating polymers.

  20. Nonlinear Dynamics of Dry Friction

    E-Print Network [OSTI]

    Franz-Josef Elmer

    1997-07-01T23:59:59.000Z

    The dynamical behavior caused by dry friction is studied for a spring-block system pulled with constant velocity over a surface. The dynamical consequences of a general type of phenomenological friction law (stick-time dependent static friction, velocity dependent kinetic friction) are investigated. Three types of motion are possible: Stick-slip motion, continuous sliding, and oscillations without sticking events. A rather complete discussion of local and global bifurcation scenarios of these attractors and their unstable counterparts is present.

  1. Dynamic Tides in Close Binaries

    E-Print Network [OSTI]

    B. Willems

    2005-11-10T23:59:59.000Z

    The basic theory of dynamic tides in close binaries is reviewed. Particular attention is paid to resonances between dynamic tides and free oscillation modes and to the role of the apsidal-motion rate in probing the internal structure of binary components. The discussed effects are generally applicable to stars across the entire Hertzsprung-Russell diagram, including the binary OB-stars discussed at this meeting.

  2. Dynamic response of monolithic and laminate/particulate reactive mixtures

    E-Print Network [OSTI]

    Wei, Chung-Ting

    2011-01-01T23:59:59.000Z

    from high speed cinematography of dynamic compressionfrom high speed cinematography of dynamic compression

  3. Perks and Culture Competitive compensation

    E-Print Network [OSTI]

    Ghosh, Joydeep

    environment · Company events and social gatherings · Creative and casual environment · Top performance for oil and gas companies around the world. Knowledge, technical innovation and teamwork

  4. Perks and Culture Competitive compensation

    E-Print Network [OSTI]

    Ghosh, Joydeep

    community · 401(k) plan with company match and immediate vesting · Creative and casual environment · Company with Microsoft. Imagine the opportunities you'll have in a company with 90,000 employees in more than 100, Windows Mobile, Xbox 360, Kinect...and many others! The best way to predict the future is to go out

  5. Perks and Culture Competitive compensation

    E-Print Network [OSTI]

    Ghosh, Joydeep

    examPles of InterestIng ProjeCts · Control Systems: In addition to traditional process control, we make the best type of control. · Smart Device Integration: Embedded computers are everywhere in a modern plant devices. · Safety Systems: In addition to controlling a process, safety of plants is critical. We develop

  6. Perks and Culture Competitive compensation

    E-Print Network [OSTI]

    Ghosh, Joydeep

    Application Integration - work on projects to integrate data between various systems and processes. Majority of projects work to allow data flow between applications and SAP. Use of SQL, XML and EDI. · Internal IT Audit and social gatherings examPles of InterestIng ProjeCts · Global Network Services - work on projects

  7. Perks and Culture Competitive compensation

    E-Print Network [OSTI]

    Ghosh, Joydeep

    and natural gas industry, including exploration and production, refining, marketing and transportation. We conduct busi- ness in approximately 180 countries, and are engaged in every aspect of the oil

  8. Banker Compensation and Confirmation Bias

    E-Print Network [OSTI]

    Sabourian, Hamid; Sibert, A C

    ;#3;) = 1+#25; #3; 2 if A = D and #25; #3; 12 #5;W (#25;#3;) = R #25;#3; 1=2 p(1#0;p)dpR #25;#3; 1=2(1#0;p)dp if A = W and #25;#3; > 12 : (24) We...

  9. Compensated intruder-detection systems

    DOE Patents [OSTI]

    McNeilly, David R. (Maryville, TN); Miller, William R. (Andersonville, TN)

    1984-01-01T23:59:59.000Z

    Intruder-detection systems in which intruder-induced signals are transmitted through a medium also receive spurious signals induced by changes in a climatic condition affecting the medium. To combat this, signals received from the detection medium are converted to a first signal. The system also provides a reference signal proportional to climate-induced changes in the medium. The first signal and the reference signal are combined for generating therefrom an output signal which is insensitive to the climatic changes in the medium. An alarm is energized if the output signal exceeds a preselected value. In one embodiment, an acoustic cable is coupled to a fence to generate a first electrical signal proportional to movements thereof. False alarms resulting from wind-induced movements of the fence (detection medium) are eliminated by providing an anemometer-driven voltage generator to provide a reference voltage proportional to the velocity of wind incident on the fence. An analog divider receives the first electrical signal and the reference signal as its numerator and denominator inputs, respectively, and generates therefrom an output signal which is insensitive to the wind-induced movements in the fence.

  10. Perks and Culture Competitive compensation

    E-Print Network [OSTI]

    Ghosh, Joydeep

    and computing power to trading in multiple asset classes around the world. This is a unique opportunity to join and modeling environment to develop automated trading strategies using machine learning, statistical analysis; design of improved tools and processes for conducting research and building trading models

  11. Employee Guide to Staff Compensation

    E-Print Network [OSTI]

    Faraon, Andrei

    .This is not considered a cost of living adjustment. BONUS IN LIEU PAY A Bonus in Lieu is a lump sum bonus paid to you instead of an Annual Salary Increase during the annual salary increase period.This bonus does not increase

  12. Dispersion-compensated Fresnel lens

    DOE Patents [OSTI]

    Johnson, K.C.

    1992-11-03T23:59:59.000Z

    A transmission grating is used to reduce chromatic aberration in a Fresnel lens, wherein the lens chromatic dispersion is offset and substantially canceled by the grating's diffraction-induced dispersion. The grating comprises a Fresnel-type pattern of microscopic facets molded directly into the lens surface. The facets would typically have a profile height of around 4[times]10[sup [minus]5] inch and a profile width of at least 10[sup [minus]3] inch. In its primary intended application, the invention would function to improve the optical performance of a Fresnel lens used to concentrate direct sunlight. 10 figs.

  13. Dispersion-compensated fresnel lens

    DOE Patents [OSTI]

    Johnson, Kenneth C. (1215 Brewster Dr., El Cerrito, CA 94530)

    1992-01-01T23:59:59.000Z

    A transmission grating is used to reduce chromatic aberration in a Fresnel lens, wherein the lens chromatic dispersion is offset and substantially canceled by the grating's diffraction-induced dispersion. The grating comprises a Fresnel-type pattern of microscopic facets molded directly into the lens surface. The facets would typically have a profile height of around 4.multidot.10.sup.-5 inch and a profile width of at least 10.sup.-3 inch. In its primary intended application, the invention would function to improve the optical performance of a Fresnel lens used to concentrate direct sunlight.

  14. Overtime Compensation | Department of Energy

    Energy Savers [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 being directed offOCHCO2:Introduction toManagementOPAM PolicyOfEnergyOutreach to Multifamily

  15. Hanford Workers Compensation - Hanford Site

    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 Office of Science (SC) EnvironmentalGyroSolé(tm) Harmonicbet When yourecoveryG - SSC Data SummaryTours

  16. Compensation Claim Process - Hanford Site

    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 for4,645 3,625govInstrumentstdmadapInactiveVisiting theCommercialization and Innovation2010 2010About Us > Hanford Site Wide

  17. Compensation | National Nuclear Security Administration

    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 for4,645 3,625govInstrumentstdmadapInactiveVisiting theCommercialization and Innovation2010 2010About Us > Hanford Site

  18. DYNAMIC MANAGEMENT OF POWER CONSUMPTION Tajana Simunic

    E-Print Network [OSTI]

    Simunic, Tajana

    Chapter 1 DYNAMIC MANAGEMENT OF POWER CONSUMPTION Tajana Simunic HP Labs Abstract Power consumption by adapting to changes in environment are proposed: dynamic power management and dynamic voltage scaling. Dynamic power management (DPM) algorithms aim to reduce the power consumption at the system level

  19. Nonlinear Dynamics of Longitudinal Ground Vehicle Traction

    E-Print Network [OSTI]

    Shaw, Steven W.

    asphalt b) Wet asphalt c) Gravel d) Packed Snow Nonlinear Dynamics of Longitudinal Ground Vehicle Traction

  20. Game dynamics and Nash equilibria Yannick Viossat

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Game dynamics and Nash equilibria Yannick Viossat CEREMADE, Universit´e Paris-Dauphine Abstract in the support of this equilibrium are eliminated by the replicator dynamics and the best- reply dynamics. MSC classification. Primary: 91A22 ; Secondary: 34A34, 34A60. Keywords: Nash equilibrium, replicator dynamics, best

  1. Event-driven multithreaded dynamic optimization

    E-Print Network [OSTI]

    Zhang, Weifeng

    2006-01-01T23:59:59.000Z

    Speci?c Optimizations . . . . . . . . . . . . . F.3. Trace Optimization Overhead . . . . . . . . . . . . . . .Dynamic Optimization . . . . . . .B. Optimizations with the

  2. A Tariff for Reactive Power

    SciTech Connect (OSTI)

    Kueck, John D [ORNL; Kirby, Brendan J [ORNL; Li, Fangxing [ORNL; Tufon, Christopher [Pacific Gas and Electric Company; Isemonger, Alan [California Independent System Operator

    2008-07-01T23:59:59.000Z

    Two kinds of power are required to operate an electric power system: real power, measured in watts, and reactive power, measured in volt-amperes reactive or VARs. Reactive power supply is one of a class of power system reliability services collectively known as ancillary services, and is essential for the reliable operation of the bulk power system. Reactive power flows when current leads or lags behind voltage. Typically, the current in a distribution system lags behind voltage because of inductive loads such as motors. Reactive power flow wastes energy and capacity and causes voltage droop. To correct lagging power flow, leading reactive power (current leading voltage) is supplied to bring the current into phase with voltage. When the current is in phase with voltage, there is a reduction in system losses, an increase in system capacity, and a rise in voltage. Reactive power can be supplied from either static or dynamic VAR sources. Static sources are typically transmission and distribution equipment, such as capacitors at substations, and their cost has historically been included in the revenue requirement of the transmission operator (TO), and recovered through cost-of-service rates. By contrast, dynamic sources are typically generators capable of producing variable levels of reactive power by automatically controlling the generator to regulate voltage. Transmission system devices such as synchronous condensers can also provide dynamic reactive power. A class of solid state devices (called flexible AC transmission system devices or FACTs) can provide dynamic reactive power. One specific device has the unfortunate name of static VAR compensator (SVC), where 'static' refers to the solid state nature of the device (it does not include rotating equipment) and not to the production of static reactive power. Dynamic sources at the distribution level, while more costly would be very useful in helping to regulate local voltage. Local voltage regulation would reduce system losses, increase circuit capacity, increase reliability, and improve efficiency. Reactive power is theoretically available from any inverter-based equipment such as photovoltaic (PV) systems, fuel cells, microturbines, and adjustable-speed drives. However, the installation is usually only economical if reactive power supply is considered during the design and construction phase. In this report, we find that if the inverters of PV systems or the generators of combined heat and power (CHP) systems were designed with capability to supply dynamic reactive power, they could do this quite economically. In fact, on an annualized basis, these inverters and generators may be able to supply dynamic reactive power for about $5 or $6 per kVAR. The savings from the local supply of dynamic reactive power would be in reduced losses, increased capacity, and decreased transmission congestion. The net savings are estimated to be about $7 per kVAR on an annualized basis for a hypothetical circuit. Thus the distribution company could economically purchase a dynamic reactive power service from customers for perhaps $6/kVAR. This practice would provide for better voltage regulation in the distribution system and would provide an alternate revenue source to help amortize the cost of PV and CHP installations. As distribution and transmission systems are operated under rising levels of stress, the value of local dynamic reactive supply is expected to grow. Also, large power inverters, in the range of 500 kW to 1 MW, are expected to decrease in cost as they become mass produced. This report provides one data point which shows that the local supply of dynamic reactive power is marginally profitable at present for a hypothetical circuit. We expect that the trends of growing power flow on the existing system and mass production of inverters for distributed energy devices will make the dynamic supply of reactive power from customers an integral component of economical and reliable system operation in the future.

  3. METR 4133, Atmospheric Dynamics III: Mid-Latitude Synoptic-Scale Dynamics

    E-Print Network [OSTI]

    Droegemeier, Kelvin K.

    METR 4133, Atmospheric Dynamics III: Mid-Latitude Synoptic- Scale Dynamics Fall 2012 Instructor Dr and Thurs, 11:30 am ­ 12:45 pm Required Texts Bluestein, H., 1992: Synoptic-Dynamic Meteorology in Mid-Latitudes, Volume I: Principles of Kinematics and Dynamics. Oxford Univ. Press, 431pp. Bluestein, H., 1993: Synoptic-Dynamic

  4. A Preliminary Analysis of the Economics of Using Distributed Energy as a Source of Reactive Power Supply

    SciTech Connect (OSTI)

    Li, Fangxing [ORNL; Kueck, John D [ORNL; Rizy, D Tom [ORNL; King, Thomas F [ORNL

    2006-04-01T23:59:59.000Z

    A major blackout affecting 50 million people in the Northeast United States, where insufficient reactive power supply was an issue, and an increased number of filings made to the Federal Energy Regulatory Commission by generators for reactive power has led to a closer look at reactive power supply and compensation. The Northeastern Massachusetts region is one such area where there is an insufficiency in reactive power compensation. Distributed energy due to its close proximity to loads seems to be a viable option for solving any present or future reactive power shortage problems. Industry experts believe that supplying reactive power from synchronized distributed energy sources can be 2 to 3 times more effective than providing reactive support in bulk from longer distances at the transmission or generation level. Several technology options are available to supply reactive power from distributed energy sources such as small generators, synchronous condensers, fuel cells or microturbines. In addition, simple payback analysis indicates that investments in DG to provide reactive power can be recouped in less than 5 years when capacity payments for providing reactive power are larger than $5,000/kVAR and the DG capital and installation costs are lower than $30/kVAR. However, the current institutional arrangements for reactive power compensation present a significant barrier to wider adoption of distributed energy as a source of reactive power. Furthermore, there is a significant difference between how generators and transmission owners/providers are compensated for reactive power supplied. The situation for distributed energy sources is even more difficult, as there are no arrangements to compensate independent DE owners interested in supplying reactive power to the grid other than those for very large IPPs. There are comparable functionality barriers as well, as these smaller devices do not have the control and communications requirements necessary for automatic operation in response to local or system operators. There are no known distributed energy asset owners currently receiving compensation for reactive power supply or capability. However, there are some cases where small generators on the generation and transmission side of electricity supply have been tested and have installed the capability to be dispatched for reactive power support. Several concerns need to be met for distributed energy to become widely integrated as a reactive power resource. The overall costs of retrofitting distributed energy devices to absorb or produce reactive power need to be reduced. There needs to be a mechanism in place for ISOs/RTOs to procure reactive power from the customer side of the meter where distributed energy resides. Novel compensation methods should be introduced to encourage the dispatch of dynamic resources close to areas with critical voltage issues. The next phase of this research will investigate in detail how different options of reactive power producing DE can compare both economically and functionally with shunt capacitor banks. Shunt capacitor banks, which are typically used for compensating reactive power consumption of loads on distribution systems, are very commonly used because they are very cost effective in terms of capital costs. However, capacitor banks can require extensive maintenance especially due to their exposure to lightning at the top of utility poles. Also, it can be problematic to find failed capacitor banks and their maintenance can be expensive, requiring crews and bucket trucks which often requires total replacement. Another shortcoming of capacitor banks is the fact that they usually have one size at a location (typically sized as 300, 600, 900 or 1200kVAr) and thus don't have variable range as do reactive power producing DE, and cannot respond to dynamic reactive power needs. Additional future work is to find a detailed methodology to identify the hidden benefit of DE for providing reactive power and the best way to allocate the benefit among customers, utilities, transmission companies or RTOs.

  5. September 2013 Most Viewed Documents for Power Generation And...

    Office of Scientific and Technical Information (OSTI)

    Gas Turbine Exhaust Diffuser Norris, Thomas R. (2009) 23 > Dynamic performance and control of a static var generator using cascade multilevel inverters Peng, Fang Zheng...

  6. Simple Dynamic Gasifier Model That Runs in Aspen Dynamics

    SciTech Connect (OSTI)

    Robinson, P.J.; Luyben, W.L. [Lehigh University, Bethlehem, PA (United States). Dept. of Chemical Engineering

    2008-10-15T23:59:59.000Z

    Gasification (or partial oxidation) is a vital component of 'clean coal' technology. Sulfur and nitrogen emissions can be reduced, overall energy efficiency is increased, and carbon dioxide recovery and sequestration are facilitated. Gasification units in an electric power generation plant produce a fuel for driving combustion turbines. Gasification units in a chemical plant generate gas, which can be used to produce a wide spectrum of chemical products. Future plants are predicted to be hybrid power/chemical plants with gasification as the key unit operation. The widely used process simulator Aspen Plus provides a library of models that can be used to develop an overall gasifier model that handles solids. So steady-state design and optimization studies of processes with gasifiers can be undertaken. This paper presents a simple approximate method for achieving the objective of having a gasifier model that can be exported into Aspen Dynamics. The basic idea is to use a high molecular weight hydrocarbon that is present in the Aspen library as a pseudofuel. This component should have the same 1:1 hydrogen-to-carbon ratio that is found in coal and biomass. For many plantwide dynamic studies, a rigorous high-fidelity dynamic model of the gasifier is not needed because its dynamics are very fast and the gasifier gas volume is a relatively small fraction of the total volume of the entire plant. The proposed approximate model captures the essential macroscale thermal, flow, composition, and pressure dynamics. This paper does not attempt to optimize the design or control of gasifiers but merely presents an idea of how to dynamically simulate coal gasification in an approximate way.

  7. Ab-Initio Molecular Dynamics

    E-Print Network [OSTI]

    Thomas D. Kühne

    2013-03-26T23:59:59.000Z

    Computer simulation methods, such as Monte Carlo or Molecular Dynamics, are very powerful computational techniques that provide detailed and essentially exact information on classical many-body problems. With the advent of ab-initio molecular dynamics, where the forces are computed on-the-fly by accurate electronic structure calculations, the scope of either method has been greatly extended. This new approach, which unifies Newton's and Schr\\"odinger's equations, allows for complex simulations without relying on any adjustable parameter. This review is intended to outline the basic principles as well as a survey of the field. Beginning with the derivation of Born-Oppenheimer molecular dynamics, the Car-Parrinello method and the recently devised efficient and accurate Car-Parrinello-like approach to Born-Oppenheimer molecular dynamics, which unifies best of both schemes are discussed. The predictive power of this novel second-generation Car-Parrinello approach is demonstrated by a series of applications ranging from liquid metals, to semiconductors and water. This development allows for ab-initio molecular dynamics simulations on much larger length and time scales than previously thought feasible.

  8. The Dynamics of Quintessence, The Quintessence of Dynamics

    E-Print Network [OSTI]

    Eric V. Linder

    2007-06-13T23:59:59.000Z

    Quintessence theories for cosmic acceleration imbue dark energy with a non-trivial dynamics that offers hope in distinguishing the physical origin of the component. We review quintessence models with an emphasis on this dynamics and discuss classifications of the different physical behaviors. The pros and cons of various parameterizations are examined as well as the extension from scalar fields to other modifications of the Friedmann expansion equation. New results on the ability of cosmological data to distinguish among and between thawing and freezing fields are presented.

  9. Statistical analysis of the dynamics of secondary electrons in the flare of a high-voltage beam-type discharge

    SciTech Connect (OSTI)

    Demkin, V. P.; Mel'nichuk, S. V. [National Research Tomsk State University, 36, Lenin Ave., 634050 Tomsk (Russian Federation)

    2014-09-15T23:59:59.000Z

    In the present work, results of investigations into the dynamics of secondary electrons with helium atoms in the presence of the reverse electric field arising in the flare of a high-voltage pulsed beam-type discharge and leading to degradation of the primary electron beam are presented. The electric field in the discharge of this type at moderate pressures can reach several hundred V/cm and leads to considerable changes in the kinetics of secondary electrons created in the process of propagation of the electron beam generated in the accelerating gap with a grid anode. Moving in the accelerating electric field toward the anode, secondary electrons create the so-called compensating current to the anode. The character of electron motion and the compensating current itself are determined by the ratio of the field strength to the concentration of atoms (E/n). The energy and angular spectra of secondary electrons are calculated by the Monte Carlo method for different ratios E/n of the electric field strength to the helium atom concentration. The motion of secondary electrons with threshold energy is studied for inelastic collisions of helium atoms and differential analysis is carried out of the collisional processes causing energy losses of electrons in helium for different E/n values. The mechanism of creation and accumulation of slow electrons as a result of inelastic collisions of secondary electrons with helium atoms and selective population of metastable states of helium atoms is considered. It is demonstrated that in a wide range of E/n values the motion of secondary electrons in the beam-type discharge flare has the character of drift. At E/n values characteristic for the discharge of the given type, the drift velocity of these electrons is calculated and compared with the available experimental data.

  10. Plasticity of metal wires in torsion: molecular dynamics and dislocation dynamics simulations

    E-Print Network [OSTI]

    Cai, Wei

    Plasticity of metal wires in torsion: molecular dynamics and dislocation dynamics simulations-4040 Abstract The orientation dependent plasticity in metal nanowires is investigated using molecular dynamics metal wires controls the mechanisms of plastic deformation. For wires oriented along 110 , dislocations

  11. Natural Dynamics for Combinatorial Optimization

    E-Print Network [OSTI]

    Ovchinnikov, Igor V

    2015-01-01T23:59:59.000Z

    Stochastic and or natural dynamical systems (DSs) are dominated by sudden nonlinear processes such as neuroavalanches, gamma-ray bursts, solar flares, earthquakes etc. that exhibit scale-free statistics. These behaviors also occur in many nanosystems. On phase diagrams, these DSs belong to a finite-width phase that separates the phases of thermodynamic equilibrium and ordinary chaotic dynamics, and that is known under such names as intermittency, noise-induced chaos, and self-organized criticality. Within the recently formulated approximation-free cohomological theory of stochastic differential equations, the noise-induced chaos can be roughly interpreted as a noise-induced overlap between regular (integrable) and chaotic (non-integrable) deterministic dynamics so that DSs in this phase inherit the properties of the both. Here, we analyze this unique set of properties and conclude that such DSs must be the most efficient natural optimizers. Based on this understanding, we propose the method of the natural dyn...

  12. Fissile solution dynamics: Student research

    SciTech Connect (OSTI)

    Hetrick, D.L.

    1994-09-01T23:59:59.000Z

    There are two research projects in criticality safety at the University of Arizona: one in dynamic simulation of hypothetical criticality accidents in fissile solutions, and one in criticality benchmarks using transport theory. We have used the data from nuclear excursions in KEWB, CRAC, and SILENE to help in building models for solution excursions. An equation of state for liquids containing gas bubbles has been developed and coupled to point-reactor dynamics in an attempt to predict fission rate, yield, pressure, and kinetic energy. It appears that radiolytic gas is unimportant until after the first peak, but that it does strongly affect the shape of the subsequent power decrease and also the dynamic pressure.

  13. Ab-Initio Molecular Dynamics

    E-Print Network [OSTI]

    Kühne, Thomas D

    2012-01-01T23:59:59.000Z

    Computer simulations and molecular dynamics in particular, is a very powerful method to provide detailed and essentially exact informations of classical many-body problems. With the advent of \\textit{ab-initio} molecular dynamics, where the forces are computed on-the-fly by accurate electronic structure calculations, the scope of either method has been greatly extended. This new approach, which unifies Newton's and Schr\\"odinger's equations, allows for complex simulations without relying on any adjustable parameter. This review is intended to outline the basic principles as well as a survey of the field. Beginning with the derivation of Born-Oppenheimer molecular dynamics, the Car-Parrinello method as well as novel hybrid scheme that unifies best of either approach are discussed. The predictive power is demonstrated by a series of applications ranging from insulators to semiconductors and even metals in condensed phases.

  14. Dynamics of Block Copolymer Nanocomposites

    SciTech Connect (OSTI)

    Mochrie, Simon G. J.

    2014-09-09T23:59:59.000Z

    A detailed study of the dynamics of cadmium sulfide nanoparticles suspended in polystyrene homopolymer matrices was carried out using X-ray photon correlation spectroscopy for temperatures between 120 and 180 °C. For low molecular weight polystyrene homopolymers, the observed dynamics show a crossover from diffusive to hyper-diffusive behavior with decreasing temperatures. For higher molecular weight polystyrene, the nanoparticle dynamics appear hyper-diffusive at all temperatures studied. The relaxation time and characteristic velocity determined from the measured hyper-diffusive dynamics reveal that the activation energy and underlying forces determined are on the order of 2.14 × 10?19 J and 87 pN, respectively. We also carried out a detailed X-ray scattering study of the static and dynamic behavior of a styrene– isoprene diblock copolymer melt with a styrene volume fraction of 0.3468. At 115 and 120 °C, we observe splitting of the principal Bragg peak, which we attribute to phase coexistence of hexagonal cylindrical and cubic double- gyroid structure. In the disordered phase, above 130 °C, we have characterized the dynamics of composition fluctuations via X-ray photon correlation spectroscopy. Near the peak of the static structure factor, these fluctuations show stretched-exponential relaxations, characterized by a stretching exponent of about 0.36 for a range of temperatures immediately above the MST. The corresponding characteristic relaxation times vary exponentially with temperature, changing by a factor of 2 for each 2 °C change in temperature. At low wavevectors, the measured relaxations are diffusive with relaxation times that change by a factor of 2 for each 8 °C change in temperature.

  15. Statistics as a dynamical attractor

    E-Print Network [OSTI]

    Michail Zak

    2012-08-30T23:59:59.000Z

    It is demonstrated that any statistics can be represented by an attractor of the solution to a corresponding systen of ODE coupled with its Liouville equation. Such a non-Newtonian representation allows one to reduce foundations of statistics to better established foundations of ODE. In addition to that, evolution to the attractor reveals possible micro-mechanisms driving random events to the final distribution of the corresponding statistical law. Special attention is concentrated upon the power law and its dynamical interpretation: it is demonstrated that the underlying dynamics supports a " violent reputation" of the power law statistics.

  16. Accelerated dynamics simulations of nanotubes.

    SciTech Connect (OSTI)

    Uberuaga, B. P. (Blas Pedro); Stuart, S. J. (Steve J.); Voter, A. F.

    2002-01-01T23:59:59.000Z

    We report on the application of accelerated dynamics techniques to the study of carbon nanotubes. We have used the parallel replica method and temperature accelerated dynamics simulations are currently in progress. In the parallel replica study, we have stretched tubes at a rate significantly lower than that used in previous studies. In these preliminary results, we find that there are qualitative differences in the rupture of the nanotubes at different temperatures. We plan on extending this investigation to include nanotubes of various chiralities. We also plan on exploring unique geometries of nanotubes.

  17. Fairness and dynamic pricing: comments

    SciTech Connect (OSTI)

    Hogan, William W.

    2010-07-15T23:59:59.000Z

    In ''The Ethics of Dynamic Pricing,'' Ahmad Faruqui lays out a case for improved efficiency in using dynamic prices for retail electricity tariffs and addresses various issues about the distributional effects of alternative pricing mechanisms. The principal contrast is between flat or nearly constant energy prices and time-varying prices that reflect more closely the marginal costs of energy and capacity. The related issues of fairness criteria, contracts, risk allocation, cost allocation, means testing, real-time pricing, and ethical policies of electricity market design also must be considered. (author)

  18. Theoretical studies of combustion dynamics

    SciTech Connect (OSTI)

    Bowman, J.M. [Emory Univ., Atlanta, GA (United States)

    1993-12-01T23:59:59.000Z

    The basic objectives of this research program are to develop and apply theoretical techniques to fundamental dynamical processes of importance in gas-phase combustion. There are two major areas currently supported by this grant. One is reactive scattering of diatom-diatom systems, and the other is the dynamics of complex formation and decay based on L{sup 2} methods. In all of these studies, the authors focus on systems that are of interest experimentally, and for which potential energy surfaces based, at least in part, on ab initio calculations are available.

  19. Dynamics of Protein Hydration Water

    E-Print Network [OSTI]

    M. Wolf; S. Emmert; R. Gulich; P. Lunkenheimer; A. Loidl

    2014-12-08T23:59:59.000Z

    We present the frequency- and temperature-dependent dielectric properties of lysozyme solutions in a broad concentration regime, measured at subzero temperatures and compare the results with measurements above the freezing point of water and on hydrated lysozyme powder. Our experiments allow examining the dynamics of unfreezable hydration water in a broad temperature range including the so-called No Man's Land (160 - 235 K). The obtained results prove the bimodality of the hydration shell dynamics and are discussed in the context of the highly-debated fragile-to-strong transition of water.

  20. Dynamic Transfer Capability Analysis with Wind Farms and Dynamic Loads

    E-Print Network [OSTI]

    Pota, Himanshu Roy

    . An investigation on the effect of dynamics loads, wind farms and flexible AC transmission system (FACTS) devices capability unnecessarily limits the power transfers and is a costly and inefficient use of a network with increasing loads, the need to transfer power over long transmission lines increases. Deregulation