National Library of Energy BETA

Sample records for dynamic var compensator

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

    E-Print Network [OSTI]

    Balakrishnan, Divya Rathna

    2012-02-14

    Reactive power, denoted as volt-ampere reactive (VARs), is fundamental to ac power systems and is due to the complex impedance of the loads and transmission lines. It has several undesirable consequences which include increased transmission loss...

  2. 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 maximum transfer capability for all possible generation mixes. The margin to low voltage limit. The IEEE 24 bus system will be used to demonstrate this method over a wide range of generation patterns

  3. 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

  4. The design and performance of Static Var Compensators for particle accelerators

    E-Print Network [OSTI]

    Kahle, Karsten; Genton, Charles-Mathieu

    2015-01-01

    Particle accelerators, and in particular synchrotrons, represent large cycling non-linear loads connected to the electrical distribution network. This paper discusses the typical design and performance of Static Var Compensators (SVCs) to obtain the excellent power quality levels required for particle accelerator operation.

  5. 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

  6. 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 Engines* Kyung-ho Ahn, Anna G. Stefanopoulou, and Mrdjan Jankovic Abstract--Ethanol is being increasingly flexible fuel vehicles (FFVs) can operate on a blend of gasoline and ethanol in any concentration of up

  7. Superconducting VAR control

    DOE Patents [OSTI]

    Boenig, Heinrich J. (Los Alamos, NM); Hassenzahl, William V. (Piedmont, CA)

    1982-01-01

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

  8. 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)

    1992-01-01

    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.

  9. Reactive Power Compensator.

    DOE Patents [OSTI]

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

    1992-07-28

    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.

  10. Comprehensive functional testing and dynamic compensation techniques for Cellular Neural Networks 

    E-Print Network [OSTI]

    Grimaila, Michael Russell

    1995-01-01

    Cellular Neural Networks (CNN's) are analog, non-linear, dynamic systems which are especially well suited for solving problems in the areas of image processing and pattern recognition. State of the art implementations of ...

  11. Superconducting VAR control. [Patent application

    DOE Patents [OSTI]

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

    1980-12-05

    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.

  12. 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.

    1981-05-12

    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.

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

    SciTech Connect (OSTI)

    Not Available

    1981-04-01

    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.

  14. Reactive power compensating system

    DOE Patents [OSTI]

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

    1987-01-01

    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.

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

    E-Print Network [OSTI]

    Collier, Bradley

    2013-09-19

    %). Real-time, dynamic temperature and oxygen predictions were demonstrated using DDRLD in conjunction with temperature compensation of the oxygen sensing film response....

  16. Compensation Techniques in Accelerator Physics

    SciTech Connect (OSTI)

    Hisham Kamal Sayed

    2011-05-31

    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.

  17. performance development and compensation

    E-Print Network [OSTI]

    Dennett, Daniel

    · ProvidinginputtothePerformanceReviewprocess. Human Resources serves as a resource for school/division leadershipperformance development and compensation programs @WorkGuidebook #12;4 | Tufts University Human performance development program Tufts Competencies 5 The @Work Performance Development and Compensation Cycle

  18. Reactive Power Compensating System.

    DOE Patents [OSTI]

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

    1985-01-04

    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.

  19. COMPENSATION ADMINISTRATION SPRING 2015

    E-Print Network [OSTI]

    and principles to understand, apply, and help develop HRM policies and practices that contribute to achieving, this course represents a type of "capstone" course for HRM majors. Perhaps more than most other HRM courses. Additionally, compensation- and benefits-related articles may be found in a variety of HRM and psychology

  20. Internal Supplemental Compensation Approval Form

    E-Print Network [OSTI]

    Clark, Bunny

    Internal Supplemental Compensation Approval Form The Ohio State University Page 1 of 1 Internal Supplemental Compensation Approval Form UMC10036­Revised 02/10 The salary of regular, full-time faculty, the individual may be eligible to receive supplemental compensation if release time is not a feasible option

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

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

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

  2. Temperature compensated photovoltaic array

    DOE Patents [OSTI]

    Mosher, D.M.

    1997-11-18

    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.

  3. Temperature compensated photovoltaic array

    DOE Patents [OSTI]

    Mosher, Dan Michael (Plano, TX)

    1997-11-18

    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.

  4. Japanese Ratify Convention on Supplementary Compensation for...

    Office of Environmental Management (EM)

    Japanese Ratify Convention on Supplementary Compensation for Nuclear Damage (CSC) Japanese Ratify Convention on Supplementary Compensation for Nuclear Damage (CSC) January 15, 2015...

  5. Compensated pulsed alternator

    DOE Patents [OSTI]

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

    1980-01-01

    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.

  6. Noise Compensation for Subspace Gaussian Mixture Models

    E-Print Network [OSTI]

    Edinburgh, University of

    Noise Compensation for Subspace Gaussian Mixture Models Liang Lu University of Edinburgh Joint work condition (i.e. noise), the gain disappears Goal Noise compensation for SGMM Method Model space compensation . . .· · · · · · · · · · ·· · ·· · ···· · ·· · ·· vjk Liang Lu, Interspeech, September, 2012 R T S C R T S C #12;Noise compensation Larger modelling

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

    SciTech Connect (OSTI)

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

    2014-08-31

    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. EMITTANCE COMPENSATION FOR MAGNETIZED BEAMS

    SciTech Connect (OSTI)

    KEWISCH,J.; CHANG, X.

    2007-06-25

    Emittance compensation is a well established technique for minimizing the emittance of an electron beam from a RF photo-cathode gun. Longitudinal slices of a bunch have a small emittance, but due to the longitudinal charge distribution of the bunch and time dependent RF fields they are not focused in the same way, so that the direction of their phase ellipses diverges in phase space and the projected emittance is much larger. Emittance compensation reverses the divergence. At the location where the slopes of the phase ellipses coincide the beam is accelerated, so that the space charge forces are reduced. A recipe for emittance compensation is given in. For magnetized beams (where the angular momentum is non-zero) such emittance compensation is not sufficient because variations in the slice radius lead to variations in the angular speed and therefore to an increase of emittance in the rotating game. We describe a method and tools for a compensation that includes the beam magnetization.

  9. Compensation for electrical converter nonlinearities

    DOE Patents [OSTI]

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

    2013-11-19

    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.

  10. 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-generators for electricity supplied to the grid Larry Hughes1 Energy Research Group Electrical and Computer Engineering-generators that supply electricity to the grid. Although many practices exist for providing such compensation, confusion

  11. Flow-Force Compensation in a Hydraulic Valve

    E-Print Network [OSTI]

    Lugowski, Jan

    2015-01-01

    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.

  12. 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

  13. Tests for Overidentifying Restrictions in Factor-Augmented VAR Models

    E-Print Network [OSTI]

    Alexandrova, Ivana

    Tests for Overidentifying Restrictions in Factor-Augmented VAR Models Xu Han Job Market Paper transform the infinite-dimensional problem into a finite-dimensional one by combining the individual has good finite-sample size and power. We imple- ment our tests to an updated version of Stock

  14. Compensated amorphous silicon solar cell

    DOE Patents [OSTI]

    Carlson, David E. (Yardley, PA)

    1980-01-01

    An amorphous silicon solar cell incorporates a region of intrinsic hydrogenated amorphous silicon fabricated by a glow discharge wherein said intrinsic region is compensated by P-type dopants in an amount sufficient to reduce the space charge density of said region under illumination to about zero.

  15. 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

  16. Avian sex chromosomes: dosage compensation matters. 

    E-Print Network [OSTI]

    McQueen, Heather A; Clinton, Michael

    2009-01-01

    of such dosage compensated genes can be found on the short arm of the Z chromosome. The implications of this new picture of avian dosage compensation for avian sex determination are discussed, along with a possible mechanism of avian dosage compensation....

  17. Human Resource Management: Employee Compensation Guide 

    E-Print Network [OSTI]

    Fogleman, Sarah L.; McCorkle, Dean

    2009-04-08

    and driving a trac- tor may require similar skills and therefore can be compensated similarly. Job evaluation is another technique that can be used to establish an equitable wage rate. This 3 method is a more systematic and rational ap- proach to internal... on labor - market information and your compensation objectives) Implement your new system, remembering to: 6. Communicate with your employees about - their needs Review your compensation package - regularly to make sure it is fair, equitable...

  18. NRL Release Number 06-1226-1945 PROC partition(VAR f:[int->nat], L:int, H:int, VAR P:int)

    E-Print Network [OSTI]

    :[int->nat], L:int, H:int, VAR P:int) f_save: [int->nat] = f; P_save: int = P; VAR lo, hi: int; VAR v: nat; L0: SKIP; L1: lo := L; L2: hi := H; L3: v := f(lo); L4: WHILE (hi > lo) DO L5: WHILE (f(hi) >= v & hi > lo) DO L6: hi := hi - 1; L7: ENDWHILE; L8: IF (hi > lo) THEN L9: f := f WITH [(lo) := f(hi), (hi) := v

  19. 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

    2011-10-21

    amplexicaulis var. amplexicaulis. Using genomic DNA from Caulanthus amplexicaulis var. barbarae, we developed a suite of microsatellite markers. In addition, we developed gene specific markers for genes known in Arabidopsis to be ecologically important. Our...

  20. 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

  1. Position control of a servopneumatic system using fuzzy compensation 

    E-Print Network [OSTI]

    Sathyanarayana, Sreenivas

    2000-01-01

    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 ...

  2. 0 2 4 6 8 10 var of Anscombed data

    E-Print Network [OSTI]

    ­to-noise ratio (SNR), but results in more radiation dose or motion artifact. An alternative approach is to design any compensation strategy for photon attenuation, scatter and collimator response. Research utilizing improvement is seen, as compared to linear low-pass filters, at noisy levels of 100 thousand counts in a 128x

  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. Meeting Notes re NOI for Convention on Supplementary Compensation...

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

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

  5. 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...

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

    Energy Savers [EERE]

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

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

    Energy Savers [EERE]

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

  8. 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...

  9. Temperature compensated two-mode fiber interferometer 

    E-Print Network [OSTI]

    Doma, Jagdish Ramchandra

    1993-01-01

    In this thesis we propose an innovative approach of designing and implementing a temperature compensated two-mode optical fiber interferometer in a control system of stabilizing the wavelength of a laser. We give the procedure for designing...

  10. Var gene transcription and clinical disease manifestation in African P. falciparum malaria field isolates 

    E-Print Network [OSTI]

    Kyriacou, Helen M

    2008-01-01

    The Plasmodium falciparum erythrocyte membrane protein 1 (PfEMP1) variant surface antigens, encoded by the var gene family, play a crucial role in malaria pathogenesis through mediating immunomodulation and host cell ...

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

    E-Print Network [OSTI]

    Low, Steven H.

    and the net benefits, taking into account the additional cost of inverter losses when operating at non the substation. Index Terms--Distribution systems, volt/var control, DC/AC inverter, optimal power flow

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

    SciTech Connect (OSTI)

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

    2008-05-01

    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.

  13. Workers' Compensation Costs Rising Across the Nation

    Office of Energy Efficiency and Renewable Energy (EERE)

    For the first time since 1992, benefits paid to workers and employers' costs for workers' compensation rose faster than wages by James L Nash (jnash@penton.com) The National Academy of Social Insurance (NASI) study, which provides the only comprehensive national data on the largely state-run program, states that premiums charged by insurers rose by eight percent in 2001.

  14. Laser focus compensating sensing and imaging device

    DOE Patents [OSTI]

    Vann, C.S.

    1993-08-31

    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.

  15. Compensation, Tuning, and Trimming of MEMS Resonators

    E-Print Network [OSTI]

    Ayazi, Farrokh

    Compensation, Tuning, and Trimming of MEMS Resonators Farrokh Ayazi, Roozbeh Tabrizian, Logan Sorenson Center for MEMS and Microsystems Technologies Georgia Institute of Technology Atlanta, GA, USA ayazi@gatech.edu Abstract--Fundamental characteristics of MEMS resonators such as acoustic velocity

  16. Neurocognitive Aging and the Compensation Hypothesis

    E-Print Network [OSTI]

    Neurocognitive Aging and the Compensation Hypothesis Patricia A. Reuter-Lorenz and Katherine A imaging studies of cognitive aging is evidence for age-related overactivation: greater acti- vation in older adults than in younger adults, even when performance is age-equivalent. Here we examine the hy

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

    E-Print Network [OSTI]

    Muslu, Volkan

    2005-01-01

    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 ...

  18. Multimodal MRI Neuroimaging with Motion Compensation Based on Particle Filtering

    E-Print Network [OSTI]

    Chen, Yu-Hui; Kim, Boklye; Meyer, Charles; Hero, Alfred

    2015-01-01

    Head movement during scanning impedes activation detection in fMRI studies. Head motion in fMRI acquired using slice-based Echo Planar Imaging (EPI) can be estimated and compensated by aligning the images onto a reference volume through image registration. However, registering EPI images volume to volume fails to consider head motion between slices, which may lead to severely biased head motion estimates. Slice-to-volume registration can be used to estimate motion parameters for each slice by more accurately representing the image acquisition sequence. However, accurate slice to volume mapping is dependent on the information content of the slices: middle slices are information rich, while edge slides are information poor and more prone to distortion. In this work, we propose a Gaussian particle filter based head motion tracking algorithm to reduce the image misregistration errors. The algorithm uses a dynamic state space model of head motion with an observation equation that models continuous slice acquisitio...

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

    E-Print Network [OSTI]

    Blazovich, Janell L.

    2010-01-16

    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...

  20. Direct Lorentz force compensation flowmeter for electrolytes

    SciTech Connect (OSTI)

    Vasilyan, S. Froehlich, Th.

    2014-12-01

    A simplified method of contactless Lorentz force (LF) measurements for flow meters on electrolytes is described and realized. Modification and comparative representation are discussed against recently well-developed methods. Based on the catapult effect, that current carrying conductor experiences a repulsive force in a magnetic field, we demonstrate force measurement method of LF velocimetry applications by commonly known “electromagnetic force” compensation principle. Measurement approach through zero point stability is considered to minimize mechanical influences and avoid gravimetric uncertainties. Here, the current carrying wires are static fixed in the vicinity of magnet system at zero point stable position, while occurring deflection of magnets by electrolyte flow is compensated by external applied current within wires. Measurements performed by developed servo-system which drives control loop by means of optical position sensor for simplified (i) single wire and (ii) coil-like extended compensation schemes. Guided by experiments on electrolyte flow, we demonstrate the applicability of adopted principle for conductivities ranging from 2 to 20?S/m. Further improvements are discussed in agreement with the parameters of demonstration setup, straightforward theory, and experimental results. We argue that this method is potentially suitable for: (a) applications with higher conductivity like molten metal (order of 10{sup 6?}S/m) assuming spatial configuration of setup and (b) for lower range of conductivity (below 1?S/m) while this is strongly subject to stiffness of system and noise mainly mechanical and thermal radiations.

  1. Self-compensating tensiometer and method

    DOE Patents [OSTI]

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

    2003-01-01

    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.

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

    DOE Patents [OSTI]

    Barrett, David M. (Albuquerque, NM)

    1996-01-01

    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.

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

    DOE Patents [OSTI]

    Barrett, D.M.

    1996-11-05

    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.

  4. Efficient Algorithm for Locating and Sizing Series Compensation...

    Office of Scientific and Technical Information (OSTI)

    Compensation Devices in Large Transmission Grids: Model Implementation We explore optimization methods for planning the placement, sizing and operations of Flexible Alternating...

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

    Office of Environmental Management (EM)

    Damage Contingent Cost Allocation; Section 934 of the Energy Independence and Security Act of 2007 Public comment re Convention on Supplementary Compensation on Nuclear Damage...

  6. Compensation for Distributed Solar: A Survey of Options to Preserve...

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

    Summary Compensation mechanisms for electricity generation systems installed behind the meter are under scrutiny in several jurisdictions in the United States. Legislators in 29...

  7. 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...

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

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

    is extended to October 27, 2010. Convention on Supplementary Compensation for Nuclear Damage Contingent Cost Allocation More Documents & Publications CSCExtension.PDF...

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

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

    the DOE Notice of Inquiry on the Convention on Supplementary Compensation for Nuclear Damage (CSC) Contingent Cost Allocation. 75 Fed. Reg. 43945 (Jul. 27, 2010). This summary of...

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

    Energy Savers [EERE]

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

  11. Optimal Allocation of Shunt Dynamic Var Source SVC and STATCOM: A Survey

    E-Print Network [OSTI]

    Tolbert, Leon M.

    network blackouts related to voltage collapse tend to occur from lack of reactive power support in heavily that the cause of the 1977 New York blackout was proved to have been a reactive power problem, and the 1987 Tokyo blackout was believed to have been due to a reactive power shortage and a voltage collapse during a summer

  12. Forecasting Economic and Financial Variables with Global VARs

    E-Print Network [OSTI]

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

    , was the price of crude oil. In the second version of the GVAR (DdPS) the money supply variable was dropped due to lack of a consistent measure across all countries, and a long-term interest rate was added to allow for simple yield curve relationships. Indeed... 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...

  13. 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.

    1995-02-07

    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.

  14. Dispersion compensation in chirped pulse amplification systems

    DOE Patents [OSTI]

    Bayramian, Andrew James; Molander, William A.

    2014-07-15

    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.

  15. Servomechanism compensating parameters solved by digital computer 

    E-Print Network [OSTI]

    Scott, Eldon Duane

    1957-01-01

    'IEPS MS. ~:b g' b 7i ls 10 0 0 10 -15O 20o ~ olg58 53 ~ 0 77 . Op/702 . 05183Ij , Opkll . 068":. . 08'gB', 0 . 1268 . 010&1' . 010'y 2i? , 0 0/3, . 010"i52 . 010"-, 71 Ozx0 . 01106g . 01' Q?u 1. 0723 , 5l j386 . 36771 ~ 27)o... be expressed mathematically as'. 1. Frequency of output-Input ratio at highest resonant peak, (&o ), 9L(s) E IsI )Y A (s) B(s) G (s) 9OIsI FIG ) BLOCK DIAGRAM OP THE CASCADE COMPENSATED SERVOMECHANISM ? ( JLO) 9O 9? FIG 2 CLOSED-LOOP FREQUENCY RESPONSE...

  16. Parameter monitoring compensation system and method

    DOE Patents [OSTI]

    Barkman, William E. (Oak Ridge, TN); Babelay, Edwin F. (Knoxville, TN); DeMint, Paul D. (Kingston, TN); Hebble, Thomas L. (Oak Ridge, TN); Igou, Richard E. (Knoxville, TN); Williams, Richard R. (Oak Ridge, TN); Klages, Edward J. (Oak Ridge, TN); Rasnick, William H. (Knoxville, TN)

    1995-01-01

    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 preprogrammed path during a machining operation 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.

  17. 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

  18. Recombination in compensated crystalline silicon for solar cells Daniel Macdonalda)

    E-Print Network [OSTI]

    in an improved short-circuit current, open-circuit voltage, and solar cell efficiency. VC 2011 American InstituteRecombination in compensated crystalline silicon for solar cells Daniel Macdonalda) and Andre. Accordingly, several research groups have dem- onstrated solar cell performance on compensated material

  19. Faculty Summer Research Salary Additional Compensation Pay Request

    E-Print Network [OSTI]

    Anderson, Paul R.

    Faculty Summer Research Salary Additional Compensation Pay Request Faculty are eligible to receive up to 1/3 of their 9-month academic salary as compensation for time spent working on research projects during the summer term. Salary is paid directly from funds awarded for the sponsored project

  20. 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

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

    E-Print Network [OSTI]

    Farivar, Masoud; Clarke, Christopher; Low, Steven

    2011-01-01

    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 ...

  2. MM_swapImgRestore() { //v3.0 var i,x,a=document.MM_sr; for(i=0;a&&i

    E-Print Network [OSTI]

    MM_swapImgRestore() { //v3.0 var i,x,a=document.MM_sr; for(i=0;a&&i=a[i])&&x.oSrc;i++) x.src=x.oSrc; } function MM_preloadImages() { //v3.0 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array(); var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i

  3. The effects of betatron phase advances on beam-beam and its compensation in RHIC

    SciTech Connect (OSTI)

    Luo, Y.; Fischer, W.; Gu, X.; Tepikian, S.; Trbojevic, D.

    2011-03-28

    In this article we perform simulation studies to investigate the effects of betatron phase advances between the beam-beam interaction points on half-integer resonance driving term, second order chromaticty and dynamic aperture in RHIC. The betatron phase advances are adjusted with artificial matrices inserted in the middle of arcs. The lattices for the 2011 RHIC polarized proton (p-p) run and 2010 RHIC Au-Au runs are used in this study. We also scan the betatron phase advances between IP8 and the electron lens for the proposed Blue ring lattice with head-on beam-beam compensation.

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

    E-Print Network [OSTI]

    Tandale, Monish Deepak

    2007-09-17

    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...

  5. Cutting tool form compensation system and method

    DOE Patents [OSTI]

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

    1993-10-19

    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.

  6. Efficient Cost Measures for Motion Compensation at Low Bit Rates

    E-Print Network [OSTI]

    Hoang, Dzung T.; Long, Philip M.; Vitter, Jeffrey Scott

    1996-01-01

    We present and compare methods for choosing motion vectors for block-based motion-compensated video coding. The primary focus is on videophone and video- conferencing applications, where low bit rates are neces- sary, where motion is usually limited...

  7. IMPORTANT NOTICE ILLINOIS STATE UNIVERSITY 403(b) DEFERRED COMPENSATION PLAN

    E-Print Network [OSTI]

    Branoff, Theodore J.

    IMPORTANT NOTICE ILLINOIS STATE UNIVERSITY 403(b) ­ DEFERRED COMPENSATION PLAN AGE 50 CATCHUP CONTRIBUTIONS The University's 403(b) Plan offers plan participants the option to make pretax contributions information about the University's 403(b) Plan can be found at http

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

    E-Print Network [OSTI]

    Tilli, Andrea; Conficoni, Christian

    2011-01-01

    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...

  9. Var C: Long-term photometric and spectral variability of an LBV in M33

    E-Print Network [OSTI]

    Burggraf, B; Bomans, D J; Henze, M; Meusinger, H; Sholukhova, O; Zharova, A; Pellerin, A; Becker, A

    2015-01-01

    So far the highly unstable phase of luminous blue variables (LBVs) has not been understood well. It is still uncertain why and which massive stars enter this phase. Investigating the variabilities by looking for a possible regular or even (semi-)periodic behaviour could give a hint at the underlying mechanism for these variations and might answer the question of where these variabilities originate. Finding out more about the LBV phase also means understanding massive stars better in general, which have (e.g. by enriching the ISM with heavy elements, providing ionising radiation and kinetic energy) a strong and significant influence on the ISM, hence also on their host galaxy. Photometric and spectroscopic data were taken for the LBV Var C in M33 to investigate its recent status. In addition, scanned historic plates, archival data, and data from the literature were gathered to trace Var C's behaviour in the past. Its long-term variability and periodicity was investigated. Our investigation of the variability i...

  10. M. Flierl and B. Girod: Video Coding with Motion Compensation for Groups of Pictures, IEEE ICIP, Sept. 2002. 1 VIDEO CODING WITH MOTION COMPENSATION FOR GROUPS OF PICTURES

    E-Print Network [OSTI]

    Flierl, Markus

    M. Flierl and B. Girod: Video Coding with Motion Compensation for Groups of Pictures, IEEE ICIP, Sept. 2002. 1 VIDEO CODING WITH MOTION COMPENSATION FOR GROUPS OF PICTURES Markus Flierl and Bernd encodes groups of pictures. Our ap- proach, motion-compensated transform coding, applies a KLT

  11. 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)

    2010-11-15

    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.

  12. Poster — Thur Eve — 58: Dosimetric validation of electronic compensation for radiotherapy treatment planning

    SciTech Connect (OSTI)

    Gräfe, James; Khan, Rao; Meyer, Tyler

    2014-08-15

    In this study we investigate the deliverability of dosimetric plans generated by the irregular surface compensator (ISCOMP) algorithm for 6 MV photon beams in Eclipse (Varian Medical System, CA). In contrast to physical tissue compensation, the electronic ISCOMP uses MLCs to dynamically modulate the fluence of a photon beam in order to deliver a uniform dose at a user defined plane in tissue. This method can be used to shield critical organs that are located within the treatment portal or improve dose uniformity by tissue compensation in inhomogeneous regions. Three site specific plans and a set of test fields were evaluated using the ?-metric of 3%/ 3 mm on Varian EPID, MapCHECK, and Gafchromic EBT3 film with a clinical tolerance of >95% passing rates. Point dose measurements with an NRCC calibrated ionization chamber were also performed to verify the absolute dose delivered. In all cases the MapCHECK measured plans met the gamma criteria. The mean passing rate for the six EBT3 film field measurements was 96.2%, with only two fields at 93.4 and 94.0% passing rates. The EPID plans passed for fields encompassing the central ?10 × 10 cm{sup 2} region of the detector; however for larger fields and greater off-axis distances discrepancies were observed and attributed to the profile corrections and modeling of backscatter in the portal dose calculation. The magnitude of the average percentage difference for 21 ion chamber point dose measurements and 17 different fields was 1.4 ± 0.9%, and the maximum percentage difference was ?3.3%. These measurements qualify the algorithm for routine clinical use subject to the same pre-treatment patient specific QA as IMRT.

  13. Optical caliper with compensation for specimen deflection and method

    DOE Patents [OSTI]

    Bernacki, Bruce E. (Knoxville, TN)

    1997-01-01

    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.

  14. Optical caliper with compensation for specimen deflection and method

    DOE Patents [OSTI]

    Bernacki, B.E.

    1997-12-09

    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.

  15. The Inverse Kinetics Method and PID Compensation of the

    E-Print Network [OSTI]

    spent working with me to understand the nuclear reactor theory. Additional thanks to Dr. Parma for all.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Nuclear Reaction TheoryThe Inverse Kinetics Method and PID Compensation of the Annular Core Research Reactor by Benjamin

  16. Reactive Power Compensation Technologies, State-of-the-Art Review

    E-Print Network [OSTI]

    Catholic University of Chile (Universidad Católica de Chile)

    is generally required to reduce voltage fluctuation at a given terminal of a transmission line. Reactive power electrical characteristics of ac power systems. Series compensation modifies the transmission or distribution at all levels of power transmission, it improves HVDC (High Voltage Direct Current) conversion terminal

  17. A new blowdown compensation scheme for boiler leak detection

    E-Print Network [OSTI]

    Marquez, Horacio J.

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

  18. MODEL COMPENSATION FOR NOISES IN TRAINING AND TEST DATA

    E-Print Network [OSTI]

    MODEL COMPENSATION FOR NOISES IN TRAINING AND TEST DATA Driss Matrouf and Jean-Luc Gauvain LIMSI on a channel model generally assume that the training data is noise-free, and the test data is noisy[1, 2, 3, 4 the channel type or the background noise characteristics is available, model com- pensation has

  19. Variability Compensation using NAP for Unconstrained Face Recognition

    E-Print Network [OSTI]

    Autonoma de Madrid, Universidad

    ). The results achieved using our implementation of a state-of-the-art system based on sparse representation-Rodriguez · Julian Fierrez · Javier Ortega-Garcia Biometric Recognition Group - ATVS, Escuela Politecnica Superior compensation scheme is evaluated on a state-of-the-art system based on sparse representation [14]. Results

  20. DRAFT 3/23/09 FACULTY COMPENSATION PLAN

    E-Print Network [OSTI]

    Nicholson, Bruce J.

    and transparent system of relationships regarding compensation/salary, faculty productivity and faculty commitment and fairness regarding specific salary components are also addressed. Salary components include base salary and incentives. Base salary is made up of a core salary to which all faculty at each rank are entitled plus

  1. Policy: Travel Compensation for Non-exempt Employees

    E-Print Network [OSTI]

    Policy: Travel Compensation for Non-exempt Employees Information contained in this document serves for overtime by federal law) salaried and hourly employees while traveling. Although CSU policy and the Federal for supervisors to interpret multiple policies on their own, CEMML has created a policy to ensure compliance

  2. ACCELERATING ITERATIVE FIELD-COMPENSATED MR IMAGE RECONSTRUCTION ON GPUS

    E-Print Network [OSTI]

    Hwu, Wen-mei W.

    ACCELERATING ITERATIVE FIELD-COMPENSATED MR IMAGE RECONSTRUCTION ON GPUS Yue Zhuo1 , Xiao-Long Wu2 , Justin P. Haldar2 , Wen-mei Hwu2 , Zhi-pei Liang2 , Bradley P. Sutton1 1 Department of Bioengineering for iterative MR image reconstruction using Graphics Processing Units (GPU). In MRI, iterative reconstruction

  3. SUSPENSION VIBRATION COMPENSATION USING A MEMS MICROACTUATOR IN HARD

    E-Print Network [OSTI]

    Horowitz, Roberto

    SUSPENSION VIBRATION COMPENSATION USING A MEMS MICROACTUATOR IN HARD DISK DRIVES Tsung-Lin Chen Kenn Oldham Yunfeng Li Roberto Horowitz ,1,2 Department of Mechanical Engineering, University of a prototype MEMS microactuator and vibration sensors, and controller design for suspension vibration

  4. Temperature compensated and self-calibrated current sensor

    DOE Patents [OSTI]

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

    2007-09-25

    A method is described to provide temperature compensation and reduction of drift due to aging for a current sensor based on a plurality of magnetic field sensors positioned around a current carrying conductor. The offset voltage signal generated by each magnetic field sensor is used to correct variations in the output signal due to temperature variations and aging.

  5. Fast Offset Compensation for a 10Gbps Limit Ethan A. Crain

    E-Print Network [OSTI]

    Perrott, Michael

    Fast Offset Compensation for a 10Gbps Limit Amplifier by Ethan A. Crain Bachelor of Science Students #12;2 #12;Fast Offset Compensation for a 10Gbps Limit Amplifier by Ethan A. Crain Submitted

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

    E-Print Network [OSTI]

    Cao, Ying

    2009-05-15

    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...

  7. 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 ...

  8. IFAS FACULTY SUPPLEMENTAL COMPENSATION PLAN In alignment with the university's strategic goal of continuing its dedication to research,

    E-Print Network [OSTI]

    Hill, Jeffrey E.

    IFAS FACULTY SUPPLEMENTAL COMPENSATION PLAN In alignment with the university's strategic goal Supplemental Compensation Plan (FSCP). Under this plan, IFAS faculty members are encouraged to recover) Eligibility for Supplemental Compensation a) All state-funded faculty members holding tenured, tenure

  9. Microcantilever heater-thermometer with integrated temperature-compensated strain sensor

    DOE Patents [OSTI]

    King, William P. (Champaign, IL); Lee, Jungchul (Champaign, IL); Goericke, Fabian T. (Wolfsburg, DE)

    2011-04-19

    The present invention provides microcantilever hotplate devices which incorporate temperature compensating strain sensors. The microcantilever hotplate devices of the present invention comprise microcantilevers having temperature compensating strain sensors and resistive heaters. The present invention also provides methods for using a microcantilever hotplate for temperature compensated surface stress measurements, chemical/biochemical sensing, measuring various properties of compounds adhered to the microcantilever hotplate surface, or for temperature compensated deflection measurements.

  10. Pressure-Compensated Hydrogen Fuel Cell WiSys Prototype Development Fund

    E-Print Network [OSTI]

    Wu, Mingshen

    Pressure-Compensated Hydrogen Fuel Cell WiSys Prototype Development Fund Final Report Principal Description The purpose of this project was to reduce-to-practice the pressure-compensated hydrogen fuel cell the performance of the new fuel cell innovation against proven strategies. The pressure-compensated fuel cell

  11. Influence of compensator thickness, field size, and off-axis distance on the effective attenuation coefficient of a cerrobend compensator for intensity-modulated radiation therapy

    SciTech Connect (OSTI)

    Haghparast, Abbas; Hashemi, Bijan; Eivazi, Mohammad Taghi

    2013-04-01

    Intensity-modulated radiation therapy (IMRT) can be performed by using compensators. To make a compensator for an IMRT practice, it is required to calculate the effective attenuation coefficient (?{sub eff}) of its material, which is affected by various factors. We studied the effect of the variation of the most important factors on the calculation of the ?{sub eff} of the cerrobend compensator for 6-MV photon beams, including the field size, compensator thickness, and off-axis distance. Experimental measurements were carried out at 100 cm source-to-surface distance and 10 cm depth for the 6-MV photon beams of an Elekta linac using various field size, compensator thickness, and off-axis settings. The field sizes investigated ranged from 4 × 4 to 25 × 25 cm{sup 2} and the cerrobend compensator thicknesses from 0.5–6 cm. For a fixed compensator thickness, variation of the ?{sub eff} with the field size ranged from 3.7–6.8%, with the highest value attributed to the largest compensator thickness. At the reference field size of 10 × 10 cm{sup 2}, the ?{sub eff} varied by 16.5% when the compensator thickness was increased from 0.5–6 cm. However, the variation of the ?{sub eff} with the off-axis distance was only 0.99% at this field size, whereas for the largest field size, it was more significant. Our results indicated that the compensator thickness and field size have the most significant effect on the calculation of the compensator ?{sub eff} for the 6-MV photon beam. Therefore, it is recommended to consider these parameters when calculating the compensator thickness for an IMRT practice designed for these beams. The off-axis distance had a significant effect on the calculation of the ?{sub eff} only for the largest field size. Hence, it is recommended to consider the effect of this parameter only for field sizes larger than 25 × 25 cm{sup 2}.

  12. LHC beam-beam compensation studies at RHIC

    SciTech Connect (OSTI)

    Fischer,W.; Abreu, N.; Calaga, R.; Robert-Demolaize, G.; Luo, Y.; Montag, C.

    2009-05-04

    Long-range and head-on beam-beam effects are expected to limit the LHC performance with design parameters. To mitigate long-range effects current carrying wires parallel to the beam were proposed. Two such wires are installed in RHIC where they allow studying the effect of strong long-range beam-beam effects, as well as the compensation of a single long-range interaction. The tests provide benchmark data for simulations and analytical treatments. To reduce the head-on beam-beam effect electron lenses were proposed for both the LHC and RHIC. We present the experimental long-range beam-beam program and report on head-on compensations studies at RHIC, which are based on simulations.

  13. Systems and methods for compensating for electrical converter nonlinearities

    DOE Patents [OSTI]

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

    2013-06-18

    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.

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

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

    1989-10-06

    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.

  15. 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)

    2007-10-09

    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.

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

    SciTech Connect (OSTI)

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

    2014-07-21

    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.

  17. 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

  18. M. Flierl and B. Girod: Video Coding with Motion Compensation for Groups of Pictures, Submitted to ICIP 2002 1 VIDEO CODING WITH MOTION COMPENSATION FOR GROUPS OF PICTURES

    E-Print Network [OSTI]

    Girod, Bernd

    M. Flierl and B. Girod: Video Coding with Motion Compensation for Groups of Pictures, Submitted to ICIP 2002 1 VIDEO CODING WITH MOTION COMPENSATION FOR GROUPS OF PICTURES Markus Flierl discusses the efficiency of a compression scheme for video sequences that jointly encodes groups of pictures

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

    SciTech Connect (OSTI)

    Hogan, William W.

    2010-11-15

    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)

  20. Project Dynamics and Emergent Complexity

    E-Print Network [OSTI]

    Schlick, Christopher M

    2011-01-01

    The present paper presents theoretical and empirical analyses of project dynamics and emergent complexity in new product development (NPD) projects. A model-driven approach was taken and a vector autoregression (VAR) model of cooperative task processing was formulated. The model is explained and validated based on an empirical study carried out in a industrial company. Furthermore, concepts and measures of complex systems science were reviewed and applied to project management. To evaluate emergent complexity in NPD projects, an information-theory quantity -termed "effective measure complexity" (EMC)- was selected, because it can be derived from first principles and therefore has high construct validity. Furthermore, EMC can be calculated efficiently from generative models of task processing or purely from historical data, without intervening models. EMC measures the mutual information between the infinite past and future histories of a stochastic process. According to this principle, it is particularly inter...

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

    E-Print Network [OSTI]

    Walker, Lawrence R.

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

  2. System for throttling and compensation for variable feedstock properties

    DOE Patents [OSTI]

    Meyer, J. W.

    1981-05-05

    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.

  3. Electric vehicle drive train with rollback detection and compensation

    DOE Patents [OSTI]

    Konrad, Charles E. (Roanoke, VA)

    1994-01-01

    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.

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

    E-Print Network [OSTI]

    Bolognani, Saverio

    2011-01-01

    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.

  5. 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

    2015-01-01

    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...

  6. Electric vehicle drive train with rollback detection and compensation

    DOE Patents [OSTI]

    Konrad, C.E.

    1994-12-27

    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.

  7. Compensation of radiation damages for SOI pixel detector via tunneling

    E-Print Network [OSTI]

    Yamada, Miho; Kurachi, Ikuo

    2015-01-01

    We are developing monolithic pixel detectors based on SOI technology for high energy physics, X-ray applications and so on.To employ SOI pixel detector on such radiation environments, we have to solve effects of total ionization damages (TID) for transistors which are enclosed in oxide layer.The holes which are generated and trapped in the oxide layers after irradiation affect characteristics of near-by transistors due to its positive electric field.Annealing and radiation of ultraviolet are not realistic to remove trapped holes for a fabricated detector due to thermal resistance of components and difficulty of handling. We studied compensation of TID effects by tunneling using a high-voltage. For decrease of trapped holes, applied high-voltage to buried p-well which is under oxide layer to inject the electrons into the oxide layer.In this report, recent progress of this study is shown.

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

    DOE Patents [OSTI]

    Larson, J.A.; Krueger, F.P.

    1987-10-05

    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. 5 figs.

  9. Apparatus and method to compensate for refraction of radiation

    DOE Patents [OSTI]

    Allen, Gary R. (Georgetown, MA); Moskowitz, Philip E. (Peabody, MA)

    1990-01-01

    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.

  10. Apparatus and method to compensate for refraction of radiation

    DOE Patents [OSTI]

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

    1990-03-27

    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.

  11. Body radiation exposure in breast cancer radiotherapy: Impact of breast IMRT and virtual wedge compensation techniques

    SciTech Connect (OSTI)

    Woo, Tony [Department of Radiation Oncology, Sunnybrook and Women's College Health Sciences Centre, Toronto, Ontario (Canada); Pignol, Jean-Philippe [Department of Radiation Oncology, Sunnybrook and Women's College Health Sciences Centre, Toronto, Ontario (Canada)]. E-mail: Jean-Philippe.Pignol@sw.ca; Rakovitch, Eileen [Department of Radiation Oncology, Sunnybrook and Women's College Health Sciences Centre, Toronto, Ontario (Canada); Vu, Toni [Department of Radiation Oncology, Sunnybrook and Women's College Health Sciences Centre, Toronto, Ontario (Canada); Hicks, Deanna [Department of Radiation Oncology, Sunnybrook and Women's College Health Sciences Centre, Toronto, Ontario (Canada); O'Brien, Peter [Department of Medical Physics, Sunnybrook and Women's College Health Sciences Centre, Toronto, Ontario (Canada); Pritchard, Kathleen [Department of Medical Oncology, Sunnybrook and Women's College Health Sciences Centre, Toronto, Ontario (Canada)

    2006-05-01

    Purpose: Recent reports demonstrate a dramatically increased rate of secondary leukemia for breast cancer patients receiving adjuvant high-dose anthracycline and radiotherapy, and that radiation is an independent factor for the development of leukemia. This study aimed to evaluate the radiation body exposure during breast radiotherapy and to characterize the factors associated with an increased exposure. Patients and Methods: In a prospective cohort of 120 women, radiation measurements were taken from four sites on the body at the time of adjuvant breast radiotherapy. Multiple regression analysis was performed to analyze patient and treatment factors associated with the amount of scattered radiation. Results: For standard 50 Gy breast radiotherapy, the minimal dose received by abdominal organs is on average 0.45 Gy, ranging from 0.06 to 1.55 Gy. The use of physical wedges as a compensation technique was the most significant factor associated with increased scattered dose (p < 0.001), resulting in approximately three times more exposure compared with breast intensity-modulated radiation therapy (IMRT) and dynamic wedge. Conclusions: The amount of radiation that is scattered to a patient's body is consistent with exposure reported to be associated with excess of leukemia. In accordance with the As Low As Reasonably Achievable (ALARA) principle, we recommend using breast IMRT or virtual wedging for the radiotherapy of breast cancer receiving high-dose anthracycline chemotherapy.

  12. GRAVITY ERROR COMPENSATION USING SECOND-ORDER GAUSS-MARKOV PROCESSES

    E-Print Network [OSTI]

    Born, George

    AAS 11-502 GRAVITY ERROR COMPENSATION USING SECOND-ORDER GAUSS-MARKOV PROCESSES Jason M. Leonard the use of a second-order Gauss-Markov process to compensate for higher order spherical harmonic gravity an improvement in POD through the use of a second-order Gauss-Markov process (GMP2) for modeling J3 gravity

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

    E-Print Network [OSTI]

    Huang, Jianwei

    1 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 with wind DG units is to provide low-cost and fast-responding reactive power compensation of the wind

  15. Method for determination of the degree of compensation for electrically active impurities in multivalley semiconductors

    SciTech Connect (OSTI)

    Baranskii, P. I.; Gaidar, G. P.

    2013-06-15

    A method for determination of the degree of compensation k = N{sub a}/N{sub d} for shallow impurities in n-Si crystals with a nondegenerate electron gas is suggested. Data facilitating practical determination of the degree of compensation are given.

  16. Time domain design of digital compensators for PWM DC-DC converters

    E-Print Network [OSTI]

    transformation and discretization. Digital PID controllers for a Buck and Boost type converters were implemented (via the various transformation algorithms), a digital compensator operates, in reality, in the sampledTime domain design of digital compensators for PWM DC-DC converters Mor Mordechai Peretz and Sam

  17. Perceptually-Based Compensation of Light Pollution in Display Systems Jeroen van Baar

    E-Print Network [OSTI]

    Toronto, University of

    Perceptually-Based Compensation of Light Pollution in Display Systems Jeroen van Baar Disney compensate for light pollution due to ghosting in 3D stereo (left) and indirect scattering when projecting framework is applicable to other light pollution problems, such as descattering. CR Categories: I.4.3 [Image

  18. Improving Dynamic Response of Active Harmonic Compensator using Digital Comb Filter

    E-Print Network [OSTI]

    Mazumder, Sudip K.

    power filter. I. INTRODUCTION The need for power quality improvement is not new. Many power electronics systems, including switching power elec- tronics, passive diode rectifiers, thyristor controlled loads, to name a few, lead to harmonic generation and degrade the power quality significantly. Among those

  19. Operational head-on beam-beam compensation with electron lenses in the Relativistic Heavy Ion Collider

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

    Fischer, W.; Gu, X.; Altinbas, Z.; Costanzo, M.; Hock, J.; Liu, C.; Luo, Y.; Marusic, A.; Michnoff, R.; Miller, T. A.; et al

    2015-12-23

    Head-on beam-beam compensation has been implemented in the Relativistic Heavy Ion Collider (RHIC) in order to increase the luminosity delivered to the experiments. We discuss the principle of combining a lattice for resonance driving term compensation and an electron lens for tune spread compensation. We describe the electron lens technology and its operational use. As of this date the implemented compensation scheme approximately doubled the peak and average luminosities.

  20. Density Pump-Out Compensation during Type-I ELM Control Experiments with n = 1 Perturbation Fields on JET

    E-Print Network [OSTI]

    Density Pump-Out Compensation during Type-I ELM Control Experiments with n = 1 Perturbation Fields on JET

  1. Compensated individually addressable array technology for human breast imaging

    DOE Patents [OSTI]

    Lewis, D. Kent (San Francisco, CA)

    2003-01-01

    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.

  2. 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)

    2012-09-15

    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.

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

    SciTech Connect (OSTI)

    Shiltsev, V.

    1998-02-01

    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.

  4. Neural network based short-term load forecasting using weather compensation

    SciTech Connect (OSTI)

    Chow, T.W.S.; Leung, C.T. [City Univ. of Hong Kong, Kowloon (Hong Kong). Dept. of Electronic Engineering] [City Univ. of Hong Kong, Kowloon (Hong Kong). Dept. of Electronic Engineering

    1996-11-01

    This paper presents a novel technique for electric load forecasting based on neural weather compensation. The proposed method is a nonlinear generalization of Box and Jenkins approach for nonstationary time-series prediction. A weather compensation neural network is implemented for one-day ahead electric load forecasting. The weather compensation neural network can accurately predict the change of actual electric load consumption from the previous day. The results, based on Hong Kong Island historical load demand, indicate that this methodology is capable of providing a more accurate load forecast with a 0.9% reduction in forecast error.

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

    E-Print Network [OSTI]

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

    2008-05-23

    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.

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

    E-Print Network [OSTI]

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

    2010-01-01

    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 ...

  7. Infrared radiometry-based background-compensated thermometric instrument for noncontact temperature and friction measurements

    E-Print Network [OSTI]

    Mandelis, Andreas

    Infrared radiometry-based background-compensated thermometric instrument for noncontact temperature and performance of a novel thermometric instrument featuring thermal- emission-intensity harmonic modulation, noncontact infrared radiometric detection, and stray background suppression is described. The instrumental

  8. 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 and Hysteresis for AFM Nanomanipulation Babak Mokaberi Student Member, IEEE, and Aristides A. G. Requicha, Life Fellow, IEEE Abstract--Nanomanipulation with Atomic Force Microscopes (AFMs) for nanoparticles

  9. 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

  10. 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)

    2007-08-07

    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.

  11. Highly Parallel Magnetic Resonance Imaging with a Fourth Gradient Channel for Compensation of RF Phase Patterns 

    E-Print Network [OSTI]

    Bosshard, John 1983-

    2012-08-20

    A fourth gradient channel was implemented to provide slice dependent RF coil phase compensation for arrays in dual-sided or "sandwich" configurations. The use of highly parallel arrays for single echo acquisition magnetic resonance imaging allows...

  12. Crosstalk Compensation for a Rapid, Higher Resolution Impedance Spectrum Measurement

    SciTech Connect (OSTI)

    Jon P. Christophersen; John L. Morrison; David M. Rose; William H. Morrison; Chester G. Motloch

    2012-03-01

    Batteries and other energy storage devices are playing larger roles in various industries (e.g., military, automotive, electric utilities, etc.) as the U.S. seeks to reduce its dependence on foreign energy resources. As such, there exists a significant need for accurate, robust state-of-health assessment techniques. Present techniques tend to focus on simple, passive monitoring of voltage and current at a given ambient temperature. However, this approach has the disadvantage of ignoring key elements of health, that is, changes in resistance growth and power fade. Impedance spectroscopy is considered a useful laboratory tool in gauging changes in the resistance and power performance, but it has not been widely considered as an onboard diagnostic tool due to the length of time required to complete the measurement. Cross-Talk Compensation (CTC) is a novel approach that enables rapid, high resolution impedance spectra measurements using a hardware platform that could be designed as an embedded system. This input signal consists of a sum-of-sines excitation current that has a known frequency spread and a duration of one period of the lowest frequency. The voltage response is then captured at a sufficiently fast sample rate. Previously developed rapid impedance spectrum measurement techniques either required a longer excitation signal or a sum-of-sines signal that was separated by harmonic frequencies to reduce or eliminate, respectively, the cross-talk interference in the calculated results. The distinct advantage of CTC, however, is that non-harmonic frequencies can now be included within the excitation signal while still keeping the signal duration at one period of the lowest frequency. Since the frequency spread of the input signal is known, the crosstalk interference between sinusoidal signals within the sum-of-sines at a given frequency of interest can be pre-determined and assigned to an error matrix. Consequently, the real and imaginary components of the impedance at each frequency of interest can be calculated using simple linear algebra based on the error matrix and measured response from the energy storage device given the excitation signal. Analytical validation of CTC over a frequency range between 2000 and 0.1 Hz (i.e., a ten-second input signal duration) was performed using a standardized battery lumped parameter model. The results indicated that the CTC was able to successfully resolve more than 45 frequencies within a sum-of-sines excitation signal, whereas previous techniques could only resolve up to 15 frequencies. A simplified derivation of the CTC technique and its corresponding analytical validation studies using the lumped-parameter model will be presented.

  13. Experiments on LHC long-range beam-beam compensation and crossing schemes at the CERN SPS in 2004

    SciTech Connect (OSTI)

    Zimmermann, F.; Koutchouk, J.-P.; Roncarolo, F.; Wenninger, J.; Sen, T.; Shiltsev, V.; Papaphilippou, Y.; /ESRF, Grenoble

    2005-05-01

    Experiments with two prototype long-range beam-beam compensators (current-carrying wires) during the 2004 CERN SPS run explored the efficiency of a proposed long-range beam-beam compensation for the LHC. In addition, the SPS compensators were also used to ''simulate'' the effect of different planes of crossing at two LHC interaction points. We present the experimental results and compare them with computer simulations.

  14. Request for Exception to APM 600.14, Additional Compensation UC Riverside --Fiscal-Year Faculty Only1

    E-Print Network [OSTI]

    Request for Exception to APM 600.14, Additional Compensation UC Riverside -- Fiscal-Year Faculty percentage of time. I certify the information above is correct

  15. Static and dynamic high pressure experiments on cerium

    SciTech Connect (OSTI)

    Jensen, Brian J [Los Alamos National Laboratory; Velisavljevic, Nenad [Los Alamos National Laboratory; Cherne, Frank J [Los Alamos National Laboratory; Stevens, Gerald [NST, STL; Tschauner, Oliver [UNIV OF NEVADA

    2011-01-25

    There is a scientific need to obtain dynamic data to develop and validate multi phase equation-of-state (EOS) models for metals. Experiments are needed to examine the relevant pure phases, to locate phase boundaries and the associated transition kinetics, and other material properties such as strength. Cerium is an ideal material for such work because it exhibits a complex multiphase diagram at relatively moderate pressures readily accessible using standard shock wave methods. In the current work, shock wave (dynamic) and diamond anvil cell (static) experiments were performed to examine the high pressure, low temperature region of the phase diagram to obtain EOS data and to search for the {alpha}-{var_epsilon} boundary. Past work examining the shock-melt transition and the low-pressure {gamma}-{alpha} transition will be presented in brief followed by details of recent results obtained from DAC and double-shock experiments.

  16. Quantum optical effective-medium theory for loss-compensated metamaterials

    E-Print Network [OSTI]

    Ehsan Amooghorban; N. Asger Mortensen; Martijn Wubs

    2013-03-13

    A central aim in metamaterial research is to engineer sub-wavelength unit cells that give rise to desired effective-medium properties and parameters, such as a negative refractive index. Ideally one can disregard the details of the unit cell and employ the effective description instead. A popular strategy to compensate for the inevitable losses in metallic components of metamaterials is to add optical gain material. Here we study the quantum optics of such loss-compensated metamaterials at frequencies for which effective parameters can be unambiguously determined. We demonstrate that the usual effective parameters are insufficient to describe the propagation of quantum states of light. Furthermore, we propose a quantum-optical effective-medium theory instead and show that it correctly predicts the properties of the light emerging from loss-compensated metamaterials.

  17. Hysteresis and compensation behaviors of spin-3/2 cylindrical Ising nanotube system

    SciTech Connect (OSTI)

    Kocakaplan, Yusuf; Keskin, Mustafa

    2014-09-07

    The hysteresis and compensation behaviors of the spin-3/2 cylindrical Ising nanotube system are studied within the framework of the effective-field theory with correlations. The effects of the Hamiltonian parameters are investigated on the magnetic and thermodynamic quantities, such as the total magnetization, hysteresis curves, and compensation behaviors of the system. Depending on the Hamiltonian parameters, some characteristic hysteresis behaviors are found, such as the existence of double and triple hysteresis loops. According to Néel classification nomenclature, the system displays Q-, R-, P-, N-, M-, and S- types of compensation behaviors for the appropriate values of the system parameters. We also compare our results with some recently published theoretical and experimental works and find a qualitatively good agreement.

  18. Compressible pressure compensator within closed lubricant volume of an earth boring apparatus

    SciTech Connect (OSTI)

    Saxman, W. C.; Parker, L. J.

    1985-04-09

    A compressible pressure compensating member is disposed within a sealed lubricant volume enclosing a bearing and seal system of an earth boring apparatus. Lubricant is maintained within the volume by metal face seals so that both the bearing and the seal structure are lubricated thereby. As the lubricant expands, due to thermal expansion under use, the increased pressure is accommodated by compression of the compressible member so that no lubricant is expelled through the seals. When the lubricant cools and contracts, the compensator expands to maintain the lubricant volume at the initially filled level.

  19. Compensator models for fluence field modulated computed tomography

    SciTech Connect (OSTI)

    Bartolac, Steven; Jaffray, David; Radiation Medicine Program, Princess Margaret Hospital Department of Radiation Oncology, University of Toronto, Toronto, Ontario M5G 2M9

    2013-12-15

    Purpose: Fluence field modulated computed tomography (FFMCT) presents a novel approach for acquiring CT images, whereby a patient model guides dynamically changing fluence patterns in an attempt to achieve task-based, user-prescribed, regional variations in image quality, while also controlling dose to the patient. This work aims to compare the relative effectiveness of FFMCT applied to different thoracic imaging tasks (routine diagnostic CT, lung cancer screening, and cardiac CT) when the modulator is subject to limiting constraints, such as might be present in realistic implementations.Methods: An image quality plan was defined for a simulated anthropomorphic chest slice, including regions of high and low image quality, for each of the thoracic imaging tasks. Modulated fluence patterns were generated using a simulated annealing optimization script, which attempts to achieve the image quality plan under a global dosimetric constraint. Optimization was repeated under different types of modulation constraints (e.g., fixed or gantry angle dependent patterns, continuous or comprised of discrete apertures) with the most limiting case being a fixed conventional bowtie filter. For each thoracic imaging task, an image quality map (IQM{sub sd}) representing the regionally varying standard deviation is predicted for each modulation method and compared to the prescribed image quality plan as well as against results from uniform fluence fields. Relative integral dose measures were also compared.Results: Each IQM{sub sd} resulting from FFMCT showed improved agreement with planned objectives compared to those from uniform fluence fields for all cases. Dynamically changing modulation patterns yielded better uniformity, improved image quality, and lower dose compared to fixed filter patterns with optimized tube current. For the latter fixed filter cases, the optimal choice of tube current modulation was found to depend heavily on the task. Average integral dose reduction compared to a uniform fluence field ranged from 10% using a bowtie filter to 40% or greater using an idealized modulator.Conclusions: The results support that FFMCT may achieve regionally varying image quality distributions in good agreement with user-prescribed values, while limiting dose. The imposition of constraints inhibits dose reduction capacity and agreement with image quality plans but still yields significant improvement over what is afforded by conventional dose minimization techniques. These results suggest that FFMCT can be implemented effectively even when the modulator has limited modulation capabilities.

  20. Competition and compensation among cattle, zebras, and elephants in a semi-arid savanna in Laikipia, Kenya

    E-Print Network [OSTI]

    Palmer, Todd M.

    Competition and compensation among cattle, zebras, and elephants in a semi-arid savanna in Laikipia mammalian herbivores have been independently manip- ulated since 1995. In plots from which cattle were). Vegetation data indicate that cattle fully compensate for the absence of wildlife; all plots accessible

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

    SciTech Connect (OSTI)

    Luketa-Hanlin, Anay Josephine; Koopman, Ronald P.; Ermak, Donald

    2006-02-01

    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.

  2. WORKERS' COMPENSATION CLAIMS PROGRAM Managed by the Office of Risk Management/Claims Services

    E-Print Network [OSTI]

    WORKERS' COMPENSATION CLAIMS PROGRAM Managed by the Office of Risk Management and needs medical a en on, the University (through his/her supervisor, the Office of Risk Management, and the Department of Labor & Industries un l the Industrial Injury claim is closed. No one knows their own job

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

    SciTech Connect (OSTI)

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

    2003-10-01

    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.

  4. 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

  5. IEEE TRANSACTIONS ON ROBOTICS, VOL. 27, NO. 6, DECEMBER 2011 1045 Position Control of Motion Compensation

    E-Print Network [OSTI]

    structures inside of the beating heart. Index Terms--Heart valves, medical robots, motion compensation flexible tubes and wires that are inserted into the vascular system and passed into the heart. Innovations catheters include measur- ing cardiac physiological function, dilating vessels and valves, Manuscript

  6. 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 and ideas and for enriching my knowledge with his brilliant insights into the fundamentals of silicon solar cells. I would like to show my gratitude to Dr. Keith McIntosh, also a member of my supervisory panel

  7. Four-wave mixing, quantum control and compensating losses in doped negative-index photonic metamaterials

    E-Print Network [OSTI]

    Alexander K. Popov; Sergey A. Myslivets; Thomas F. George; Vladimir M. Shalaev

    2007-08-13

    The possibility of compensating absorption in negative-index metatamterials (NIMs) doped by resonant nonlinear-optical centers is shown. The role of quantum interference and extraordinary properties of four-wave parametric amplification of counter-propagating electromagnetic waves in NIMs are discussed.

  8. 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 as an alternative fuel to petroleum-based gasoline and diesel derivatives. Currently available flexible fuel the closed-loop air-to-fuel ratio (AFR) control which maintains automatically operation around

  9. A DECOUPLED FILTERED-X LMS ALGORITHM FOR LISTENING-ROOM COMPENSATION

    E-Print Network [OSTI]

    Lübeck, Universität zu

    A DECOUPLED FILTERED-X LMS ALGORITHM FOR LISTENING-ROOM COMPENSATION Stefan Goetze, Markus learning algorithms based on the well-known least-mean-squares (LMS) algorithm can be used. Examples known from the field of active noise control (ANC) are the filtered-X LMS (FxLMS) or the modified filtered

  10. Multi-Channel Listening-Room Compensation using a Decoupled Filtered-X LMS Algorithm

    E-Print Network [OSTI]

    Lübeck, Universität zu

    Multi-Channel Listening-Room Compensation using a Decoupled Filtered-X LMS Algorithm Stefan Goetze on a decoupled version of the modified filtered-X LMS (mFxLMS) will be derived in the partitioned frequency control (ANC) are based on the least-mean-squares (LMS) algorithm [2], such as the filtered-X least

  11. Compensation for the Eddy Current Effect in the APS Storage Ring Vacuum Chamber

    E-Print Network [OSTI]

    Kemner, Ken

    Compensation for the Eddy Current Effect in the APS Storage Ring Vacuum Chamber Y. Chung Abstract inside the APS storage ring vacuum chamber due to the eddy current effect were measured. A circuit of the correction magnet field, externally applied to the vac- uum chamber, induces eddy current inside the aluminum

  12. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 1 Land-Contamination Compensation for QuikSCAT

    E-Print Network [OSTI]

    Long, David G.

    IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 1 Land-Contamination Compensation for Quik) resolutions. In near-coastal regions, land contamination of measurements results in inaccurate wind estimates using current techniques. Here, we show that identifying land-contaminated measurements allows wind

  13. Regulation and Compensation of Source Harmonics for the Boost ConverterBased Power Factor

    E-Print Network [OSTI]

    Perreault, Dave

    Regulation and Compensation of Source Harmonics for the Boost Converter­Based Power Factor of a diode bridge and associated boost converter. This circuit is the most widely employed of the fam- ily for the boost­ based power factor precompensator which guarantees fast regulation of the output voltage towards

  14. Power Smoothing Control in a Grid-Connected Marine Current Turbine System for Compensating

    E-Print Network [OSTI]

    Boyer, Edmond

    Power Smoothing Control in a Grid-Connected Marine Current Turbine System for Compensating Swell speed may lead to strong fluctuations in the power extracted by a marine current turbine (MCT). During disturbances. Index Terms--Marine current turbine, power fluctuation, swell effect, power smoothing control

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

    E-Print Network [OSTI]

    Fleming, Andrew J.

    applications requiring precision positioning e.g. nanomachining [2], [3] etc. A piezoelectric scanner comprisesSensor-less Vibration Suppression and Scan Compensation for Piezoelectric Tube Nanopositioners (Invited Paper) Andrew J. Fleming and S. O. Reza Moheimani Abstract-- Piezoelectric tube scanners

  16. Design of an Optimal Flight Control System with Integral Augmented Compensator for a Nonlinear UAV Helicopter

    E-Print Network [OSTI]

    Li, Yangmin

    Design of an Optimal Flight Control System with Integral Augmented Compensator for a Nonlinear UAV presents the development of an optimal flight control system for a small-scale Unmanned Aerial Vehicle (UAV and the controller design. In this work, the comprehensive nonlinear model of the helicopter system is derived from

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

    E-Print Network [OSTI]

    for computation of feedback controls and compensators in a high pressure chemical vapor deposition (HPCVD) reactor are manufactured using chemical vapor deposition (CVD) processes operating at low pressure. However, there are also under low pressure conditions, e.g., InN films that exhibit relatively high decomposition pressure

  18. Radar transponder operation with compensation for distortion due to amplitude modulation

    DOE Patents [OSTI]

    Ormesher, Richard C. (Albuquerque, NM); Tise, Bertice L. (Albuquerque, NM); Axline, Jr., Robert M. (Albuquerque, NM)

    2011-01-04

    In radar transponder operation, a variably delayed gating signal is used to gate a received radar pulse and thereby produce a corresponding gated radar pulse for transmission back to the source of the received radar pulse. This compensates for signal distortion due to amplitude modulation on the retransmitted pulse.

  19. 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

  20. Temperature-compensated chemical reactions Kanaka Rajan and L. F. Abbott

    E-Print Network [OSTI]

    Abbott, Laurence

    Temperature-compensated chemical reactions Kanaka Rajan and L. F. Abbott Center for Neurobiology oscillations in mRNA and protein levels, the question of how to construct a network of chemical reactions The rates of most chemical reactions are sensitive to tem- perature with, in simple cases, an exponential

  1. Glass-Blown Pyrex Resonator with Compensating Ti Coating for Reduction of TCF

    E-Print Network [OSTI]

    Chen, Zhongping

    of metallic glasses to achieve spherical structures has been explored by using a blow-molding technique [6]; processing of these materials requires temperatures in excess of 1,600 C. A highly parallel glass-blowingGlass-Blown Pyrex Resonator with Compensating Ti Coating for Reduction of TCF Joan Giner1

  2. Electron lenses for compensation of beam-beam effects: Tevatron, RHIC, LHC

    SciTech Connect (OSTI)

    Shiltsev, V.; /Fermilab

    2007-12-01

    Since previous BEAM'06 workshop a year ago, significant progress has been made in the field of beam-beam compensation (BBC)--it has been experimentally demonstrated that both Tevatron Electron Lenses (TEL) significantly improve proton and luminosity lifetimes in high-luminosity stores. This article summarizes these results and discusses prospects of the BBC in Tevatron, RHIC and LHC.

  3. GAIN-SCHEDULED PID FOR IMBALANCE COMPENSATION OF A MAGNETIC BEARING

    E-Print Network [OSTI]

    Noll, Dominikus

    GAIN-SCHEDULED PID FOR IMBALANCE COMPENSATION OF A MAGNETIC BEARING Laleh Hosseini@yahoo.fr, noll@mip.ups-tlse.fr Keywords: Scheduled controller for magnetic bearing, H optimal decentralized PID of a magnetic bearing device is addressed by parameter varying control. Within the structure of decen- tralized

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

    SciTech Connect (OSTI)

    Litvinenko, V. N.; Wang, G.

    2014-05-09

    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.

  5. 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)

    2008-01-22

    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.

  6. 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)

    2007-10-09

    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.

  7. Fern (Notholaena sinuata, var. Crenata) Poisoning in Sheep, Goats and Cattle : The So-Called "Jimmies" of the Trans-Pecos. 

    E-Print Network [OSTI]

    Mathews, Frank P. (Frank Patrick)

    1942-01-01

    STATION A. B. CONNER, DIRECTOR College Station, Texas BULLETIN NO. 611 APRIL 1942 FERN (NOTHOLAENA SINUATA, var. Crenata) POISONING IN SHEEP, GOATS, AND CATTLE-THE SO-CALLED "JIMMIES" OF THE TRANS-PECOS FRANK P. MATHEWS Division of Veterinary...~rer death rate in goats than in sheep. From reports which have reach d e/\\ 6 BULLETIN NO. Ell, TEXAS AGRICULTURSL ESPERIllEST S'TXTIOS the author it is evident that this condition occurs in cattle but authentic reports of losses from this source have...

  8. Sandia Energy - Scattering Dynamics

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

    Scattering Dynamics Home Transportation Energy Predictive Simulation of Engines Combustion Chemistry Chemical Dynamics Scattering Dynamics Scattering DynamicsAshley...

  9. High-efficiency carbohydrate fermentation to ethanol at temperatures above 40/sup 0/C by Kluyveromyces marxianus var. marxianus isolated from sugar mills

    SciTech Connect (OSTI)

    Anderson, P.J.; NcNeil, K.; Watson, K.

    1986-06-01

    A number of yeast strains, isolated from sugar can mills and identified as strains of Kluyveromyces marxianus var. marxianus, were examined for their ability to ferment glucose and cane syrup to ethanol at high temperatures. Several strains were capable of rapid fermentation at temperatures up to 47/sup 0/C. At 43/sup 0/C, >6% (wt/vol) ethanol was produced after 12 to 14 h of fermentation, concurrent with retention of high cell viability (>80%). Although the type strain (CBS 712) of K. marxianus var. marxianus produced up to 6% (wt/vol) ethanol at 43/sup 0/C, cell viability was low, 30 to 50%, and the fermentation time was 24 to 30 h. On the basis of currently available strains, the authors suggest that it may be possible by genetic engineering to construct yeasts capable of fermenting carbohydrates at temperatures close to 50/sup 0/C to produce 10 to 15% (wt/vol) ethanol in 12 to 18 h with retention of cell viability.

  10. Summary of the LARP Mini-Workshop on Beam-Beam Compensation 2007

    SciTech Connect (OSTI)

    Fischer, Wolfram; Bruning, Oliver S.; Koutchouk, J.P.; Zimmermann, F.; Sen, T.; Shiltsev, V.; Ohmi, K.; Furman, M.; Cai, Y.; Chao, A.; /SLAC

    2011-11-07

    The LARP Mini-Workshop on Beam-Beam Compensation 2007 was held at SLAC, 2-4 July 2007. It was attended by 33 participants from 10 institutions in Asia, Europe, and America. 26 presentations were given, while more than one third of the time was allocated to discussions. The workshop web site is Ref. [1]. The workshop's main focus was on long-range and head-on beam-beam compensation, with a view towards application in the LHC. Other topics included the beam-beam performance of previous, existing and future circular colliders; beam-beam simulations; new operating modes, theory, and unexplained phenomena. This summary is also published as Ref. [2].

  11. p-Doping limit and donor compensation in CdTe polycrystalline thin film solar cells

    E-Print Network [OSTI]

    p-Doping limit and donor compensation in CdTe polycrystalline thin film solar cells Ken K. Chin n substitution of Cd CuCd 0=À #12; #12; play critical roles in p-doping of CdTe in CdS/CdTe thin film solar cells in Fig. 1. As for the CdTe polycrystalline thin film in a CdS/CdTe solar cell, it is still being debated

  12. Compensation for Distributed Solar. A Survey of Options to Preserve Stakeholder Value

    SciTech Connect (OSTI)

    Flores-Espino, Francisco

    2015-09-01

    Compensation mechanisms for electricity generation systems installed behind the meter are under scrutiny in several jurisdictions in the United States. Legislators in 29 states introduced bills to amend net metering provisions in 2014, and in 33 states in the 2015 legislative session as of August 20, 2015. Some utilities have also sought to increase the revenue they receive from net-metered customers through rate redesign. The circumstances that have triggered the recent push for change include a growing percentage of net-metered customers, potential effects of distributed generation on cost allocation, decreasing photovoltaic (PV) system costs, the challenges of integrating high levels of solar generation in the distribution network, and increasing pressure on utility business models. This report presents a survey of options to charge and compensate PV customers, as well as options that may preserve utility revenues in scenarios with increased DG. These options could be used as building blocks to create a distributed generation (DG) compensation policy that may preserve the value of the different stakeholders and balance their interests.

  13. REVIEW OF SCIENTIFIC INSTRUMENTS 82, 063704 (2011) Flexible drift-compensation system for precise 3D force mapping in severe

    E-Print Network [OSTI]

    Kühnle, Angelika

    2011-01-01

    is of great importance, but also a challenge for scanning probe microscopy (SPM). Thermal drift often induces a flexible drift compensation system which can easily be connected to existing SPM hardware. Furthermore, we

  14. EBT GAFCHROMIC{sup TM} film dosimetry in compensator-based intensity modulated radiation therapy

    SciTech Connect (OSTI)

    Vaezzadeh, Seyedali [Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of); Allahverdi, Mahmoud, E-mail: alahverdi@sina.tums.ac.ir [Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of); Department of Radiotherapy—Oncology, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of); Nedaie, Hasan A. [Department of Radiotherapy—Oncology, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of); Ay, Mohammadreza [Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of); Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of); Shirazi, Alireza; Yarahmadi, Mehran [Department of Medical Physics and Biomedical Engineering, Tehran University of Medical Sciences, Tehran (Iran, Islamic Republic of)

    2013-07-01

    The electron benefit transfer (EBT) GAFCHROMIC films possess a number of features making them appropriate for high-quality dosimetry in intensity-modulated radiation therapy (IMRT). Compensators to deliver IMRT are known to change the beam-energy spectrum as well as to produce scattered photons and to contaminate electrons; therefore, the accuracy and validity of EBT-film dosimetry in compensator-based IMRT should be investigated. Percentage-depth doses and lateral-beam profiles were measured using EBT films in perpendicular orientation with respect to 6 and 18 MV photon beam energies for: (1) different thicknesses of cerrobend slab (open, 1.0, 2.0, 4.0, and 6.0 cm), field sizes (5×5, 10×10, and 20×20 cm{sup 2}), and measurement depths (D{sub max}, 5.0 and 10.0 cm); and (2) step-wedged compensator in a solid phantom. To verify results, same measurements were implemented using a 0.125 cm{sup 3} ionization chamber in a water phantom and also in Monte Carlo simulations using the Monte Carlo N-particle radiation transport computer code. The mean energy of photons was increased due to beam hardening in comparison with open fields at both 6 and 18 MV energies. For a 20×20 cm{sup 2} field size of a 6 MV photon beam and a 6.0 cm thick block, the surface dose decreased by about 12% and percentage-depth doses increased up to 3% at 30.0 cm depth, due to the beam-hardening effect induced by the block. In contrast, at 18 MV, the surface dose increased by about 8% and depth dose reduced by 3% at 30.0 cm depth. The penumbral widths (80% to 20%) increase with block thickness, field size, and beam energy. The EBT film results were in good agreement with the ionization chamber dose profiles and Monte Carlo N-particle radiation transport computer code simulation behind the step-wedged compensator. Also, there was a good agreement between the EBT-film and the treatment-planning results on the anthropomorphic phantom. The EBT films can be accurately used as a 2D dosimeter for dose verification and quality assurance of compensator-based C-IMRT.

  15. Mutually compensative pseudo solutions of primary energy spectra in the knee region

    E-Print Network [OSTI]

    S. V. Ter-Antonyan

    2007-06-27

    The problem of the uniqueness of solutions during the evaluation of primary energy spectra in the knee region using an extensive air shower (EAS) data set and the EAS inverse approach is investigated. It is shown that the unfolding of primary energy spectra in the knee region leads to mutually compensative pseudo solutions. These solutions may be the reason for the observed disagreements in the elementary energy spectra of cosmic rays in the 1-100 PeV energy range obtained from different experiments.

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

    SciTech Connect (OSTI)

    Not Available

    1991-12-31

    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).

  17. POLICY FLASH 2014-12 Executive Compensation Cap | 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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousMathematicsEnergyInterested PartiesBuilding energy codes have a more thanPNM2 Executive Compensation Cap

  18. Dynamic power balance for nonlinear waves in unbalanced gain and loss landscapes

    E-Print Network [OSTI]

    Kominis, Yannis

    2015-01-01

    The presence of losses in nonlinear photonic structures is a crucial issue for modern applications. Active parts are introduced for wave power compensation resulting in unbalanced gain and loss landscapes where localized beam propagation is, in general, dynamically unstable. Here we provide generic sufficient conditions for the relation between the gain-loss and the refractive index profiles in order to ensure efficient wave trapping and stable propagation for a wide range of beam launching conditions such as initial power, angle of incidence and position. The stability is a consequence of an underlying dynamic power balance mechanism related to a conserved quantity of wave dynamics.

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

    E-Print Network [OSTI]

    Lugowski, Jan

    2013-01-01

    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...

  20. An analysis of weep holes as a product detection device for underground compensated LPG storage systems

    SciTech Connect (OSTI)

    Sarica, C.; Demir, H.M.; Brill, J.P.

    1996-09-01

    Weep holes have been used widely to detect the presence of Liquefied Petroleum Gases (LPG) in brine for underground compensated storage systems. When the brine level drops below the weep hole, LPG product enters the brine production system causing an increase in both tubing head pressure and flow rate. To prevent cavern overfill, a cavern shutdown is initiated upon detection of LPG in the surface brine system by pressure or flow instruments at the tubing head. In this study, we have investigated the multiphase flow characteristics of weep hole LPG detection systems to correctly estimate the operating limits. A simple and easy to use model has been developed to predict the tubing head pressure and flow rate increases. The model can be used to implement safer and more efficient operation procedures for underground compensated LPG storage systems. The model predictions for a typical field case are presented. An analysis of weep holes as product detection devices for LPG storage reservoirs has been carried out. It was found that the increases in pressure and flow rates at the tubing head change as a function of injection flow rate of the product. Therefore, a thorough consideration of cavern operating parameters is necessary to evaluate the use constant pressure and flow rate values to initiate emergency shut down of the cavern.

  1. 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)

    2014-06-15

    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.

  2. Dynamic Reconstruction

    E-Print Network [OSTI]

    Horn, Berthold Klaus Paul

    Dynamic reconstruction is a method for generating images or image sequences from data obtained using moving radiation detection systems. While coded apertures are used as examples of the underlying information collection ...

  3. CHOICE IS COMING.Introducing the DOAS Workers' Compensation Benefit Payment Card Program: The fast, secure and most convenient way to receive

    E-Print Network [OSTI]

    Arnold, Jonathan

    Workers' Compensation benefits loaded to a Visa® prepaid card or deposited directly to your bank account.S.A. Inc. and managed by Citi Prepaid Services. #12;

  4. Plasmon Injection to Compensate and Control Losses in Negative Index Metamaterials

    E-Print Network [OSTI]

    Sadatgol, Mehdi; Yang, Lan; Güney, Durdu Ö

    2015-01-01

    Metamaterials have introduced a whole new world of unusual materials with functionalities that cannot be attained in naturally occurring material systems by mimicking and controlling the natural phenomena at subwavelength scales. However, the inherent absorption losses pose fundamental challenge to the most fascinating applications of metamaterials. Based on a novel plasmon injection (PI or \\Pi) scheme, we propose a coherent optical amplification technique to compensate losses in metamaterials. Although the proof of concept device here operates under normal incidence only, our proposed scheme can be generalized to arbitrary form of incident waves. The \\Pi-scheme is fundamentally different than major optical amplification schemes. It does not require gain medium, interaction with phonons, or any nonlinear medium. The \\Pi-scheme allows for loss-free metamaterials. It is ideally suited for mitigating losses in metamaterials operating in the visible spectrum and is scalable to other optical frequencies. These fin...

  5. The E-lens test bench for RHIC beam-beam compensation

    SciTech Connect (OSTI)

    Gu X.; Altinbas, F.Z.; Aronson, J.; Beebe, E. et al

    2012-05-20

    To compensate for the beam-beam effects from the proton-proton interactions at IP6 and IP8 in the Relativistic Heavy Ion Collider (RHIC), we are fabricating two electron lenses that we plan to install at RHIC IR10. Before installing the e-lenses, we are setting-up the e-lens test bench to test the electron gun, collector, GS1 coil, modulator, partial control system, some instrumentation, and the application software. Some e-lens power supplies, the electronics for current measurement will also be qualified on test bench. The test bench also was designed for measuring the properties of the cathode and the profile of the beam. In this paper, we introduce the layout and elements of the e-lens test bench; and we discuss its present status towards the end of this paper.

  6. Total skin electron beam therapy using an inclinable couch on motorized table and a compensating filter

    SciTech Connect (OSTI)

    Fuse, H.; Suzuki, K.; Shida, K.; Takahashi, H.; Kobayashi, D.; Seki, M.; Mori, Y.; Sakae, T.; Isobe, T.; Okumura, T.; Sakurai, H.

    2014-06-15

    Total skin electron beam is a specialized technique that involves irradiating the entire skin from the skin surface to only a few millimetres in depth. In the Stanford technique, the patient is in a standing position and six different directional positions are used during treatment. Our technique uses large electron beams in six directions with an inclinable couch on motorized table and a compensating filter was also used to spread the electron beam and move its intensity peak. Dose uniformity measurements were performed using Gafchromic films which indicated that the surface dose was 2.04 ± 0.05 Gy. This technique can ensure the dose reproducibility because the patient is fixed in place using an inclinable couch on a motorized table.

  7. 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)

    2008-12-16

    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.

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

    DOE Patents [OSTI]

    Dawson, John W. (Willowbrook, IL)

    1991-01-01

    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.

  9. 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

    2008-01-01

    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.

  10. Simulations of Octupole Compensation of head-tail instability at the Tevatron M. Xiao and T. Sen, FNAL, Batavia, IL 60510, USA

    E-Print Network [OSTI]

    Large Hadron Collider Program

    Simulations of Octupole Compensation of head-tail instability at the Tevatron M. Xiao and T. Sen in the Tevatron depends sensitively on chromaticities. Too low chromaticities can make the beam unstable due to the weak head-tail instability. One way to compensate this effect is to introduce octupoles to create

  11. JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 97, NO. BIO, PAGES 14,207-14,221, SEPTEMBER lO, 1992 On the Stability of Isostatically Compensated Mountain Belts

    E-Print Network [OSTI]

    Sandiford, Mike

    On the Stability of Isostatically Compensated Mountain Belts SHAOHUA ZHOU AND MICHAEL SANDIFORD Department of convergent mountain belts is invariably accompanied by an increase in grav- itational potential energy due of isostatically compensated mountain belts under the assumption that the strength of continental Iithosphere

  12. 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

  13. 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

    2005-01-01

    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

  14. Improved device performance of InAs/GaAs quantum dot solar cells with GaP strain compensation layers

    E-Print Network [OSTI]

    Jalali. Bahram

    Improved device performance of InAs/GaAs quantum dot solar cells with GaP strain compensation Center for High Technology Materials, University of New Mexico, 1313 Goddard SE, Albuquerque, New Mexico optical, electrical, and spectral response characteristics of three-stack InAs/GaAs quantum dot solar

  15. IEEE TRANSACTIONS ON AUTOMATIC CONTROL, VOL. AC-20, NO. 6, DECEMBER 1975 127 Acoustics, Stability, and Compensation in Boiling

    E-Print Network [OSTI]

    Kwatny, Harry G.

    , and Compensation in Boiling Water Reactor Pressure Control Systems Abstract-An analysisis provided of the effeds THECONTROL of steam pressure inboiling water reactor(BWR)nuclear power stations is one of the critical plantIEEE TRANSACTIONS ON AUTOMATIC CONTROL, VOL. AC-20, NO. 6, DECEMBER 1975 127 Acoustics, Stability

  16. 5790 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 27, NO. 24, DECEMBER 15, 2009 Algorithms for Compensation of Multimode Fiber

    E-Print Network [OSTI]

    Kahn, Joseph M.

    for Compensation of Multimode Fiber Dispersion Using Adaptive Optics Rahul Alex Panicker and Joseph M. Kahn, Fellow, IEEE Abstract--We propose adaptive algorithms for mitigating inter- symbol interference (ISI) in multimode fiber (MMF) systems using a spatial light modulator (SLM). Minimizing ISI in MMF systems using

  17. Impact of compensation on the boron and oxygen-related degradation of upgraded metallurgical-grade silicon solar cells

    E-Print Network [OSTI]

    of the BO defect and thus improve the final performance of UMG-Si solar cells. Another lately debated issue-grade silicon solar cells Maxime Forster a,n , Pierre Wagner a,b , Julien Degoulange a , Roland Einhaus compensation on the degradation of carrier lifetime and solar cells performance due to the boron­oxygen defect

  18. 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)

    2013-12-15

    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.

  19. Hierarchical Dynamic Models

    E-Print Network [OSTI]

    Penny, Will

    Hierarchical Dynamic Models Will Penny OU Processes Embedding OU(2) process Dynamic Models Hierarchical Dynamic Models Will Penny 26th May 2011 #12;Hierarchical Dynamic Models Will Penny OU Processes Dynamic Models Will Penny OU Processes Embedding OU(2) process Dynamic Models Generalised coordinates

  20. Design and experimental study on pressure compensating emitters in drip irrigation

    E-Print Network [OSTI]

    Lin, Teresa (Teresa Ye)

    2015-01-01

    This thesis aims to solve the basic physics behind the collapsible tube dripper design used in drip irrigation. A study was performed on the dynamics of the flow limitation of collapsible tubes. Two parameters were studied: ...

  1. Space charge compensation on the low energy beam transport of Linac4

    E-Print Network [OSTI]

    AUTHOR|(SzGeCERN)733270; Scrivens, Richard; Jesus Castillo, Santos

    Part of the upgrade program in the injector chains of the CERN accelerator complex is the replacement of the the proton accelerator Linac2 for the brand new Linac4 which will accelerate H$^-$ and its main goal is to increase the beam intensity in the next sections of the LHC accelerator chain. The Linac4 is now under commissioning and will use several ion sources to produce high intensity unbunched H$^-$ beams with different properties, and the low energy beam transport (LEBT) is the system in charge of match all these different beams to the Radio frequency quadrupole (RFQ). The space charge forces that spread the beam ions apart of each other and cause emittance growth limits the maximum intensity that can be transported in the LEBT, but the space charge of intense unbunched ion beams can be compensated by the generated ions by the impact ionization of the residual gas, which creates a source of secondary particles inside the beam pipe. For negative ion beams, the effect of the beam electric field is to ex...

  2. Compensation of decoherence from telegraph noise by means of bang-bang control

    E-Print Network [OSTI]

    H. Gutmann; F. K. Wilhelm; W. M. Kaminsky; S. Lloyd

    2003-09-17

    With the growing efforts in isolating solid-state qubits from external decoherence sources, the origins of noise inherent to the material start to play a relevant role. One representative example are charged impurities in the device material or substrate, which typically produce telegraph noise and can hence be modelled as bistable fluctuators. In order to demonstrate the possibility of the active suppression of the disturbance from a {\\em single} fluctuator, we theoretically implement an elementary bang-bang control protocol. We numerically simulate the random walk of the qubit state on the Bloch sphere with and without bang-bang compensation by means of the stochastic Schr\\"odinger equation and compare it with an analytical saddle point solution of the corresponding Langevin equation in the long-time limit. We find that the deviation with respect to the noiseless case is significantly reduced when bang-bang pulses are applied, being scaled down approximately by the ratio of the bang-bang period and the typical flipping time of the bistable fluctuation. Our analysis gives not only the effect of bang-bang control on the variance of these deviations, but also their entire distribution. As a result, we expect that bang-bang control works as a high-pass filter on the spectrum of noise sources. This indicates how the influence of $1/f$-noise ubiquitous to the solid state world can be reduced.

  3. Weak-strong simulation on head-on beam-beam compensation in the RHIC

    SciTech Connect (OSTI)

    Luo,Y.; Fischer, W.; McIntosh, E.; Robert-Demolaize, G.; Abreu, N.; Beebe-Wang, J.; Montag, C.

    2009-05-04

    In the Relativistic Heavy Ion Collider (RHIC) beams collide in the two interaction points IP6 and IP8. To further increase the bunch intensity above 2 x 10{sup 11} or further reduce the transverse emittance in polarized proton operation, there will not be enough tune space between the current working area [2/3, 7/10] to hold the beam-beam generated tune spread. We proposed a low energy DC electron beam (e-lens) with similar Gaussian transverse profiles to collide with the proton beam at IP10. Early studies have shown that e-lens does reduce the proton-proton beam-beam tune spread. In this article, we carried out numerical simulation to investigate the effects of the head-on beam-beam effect on the proton's colliding beam lifetime and emittance growth. The preliminary results including scans of compensation strength, phase advances between IP8 and IP10, electron beam transverse sizes are presented. In these studies, the particle loss in the multi-particle simulation is used for the comparison between different conditions.

  4. Polarity compensation in ultra-thin films of complex oxides: The case of a perovskite nickelate

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

    Middey, S.; Rivero, P.; Meyers, D.; Kareev, M.; Liu, X.; Cao, Y.; Freeland, J. W.; Barraza-Lopez, S.; Chakhalian, J.

    2014-10-29

    We address the fundamental issue of growth of perovskite ultra-thin films under the condition of a strong polar mismatch at the heterointerface exemplified by the growth of a correlated metal LaNiO3 on the band insulator SrTiO3 along the pseudo cubic [111] direction. While in general the metallic LaNiO3 film can effectively screen this polarity mismatch, we establish that in the ultra-thin limit, films are insulating in nature and require additional chemical and structural reconstruction to compensate for such mismatch. A combination of in-situ reflection high-energy electron diffraction recorded during the growth, X-ray diffraction, and synchrotron based resonant X-ray spectroscopy revealmore »the formation of a chemical phase La2Ni2O5 (Ni2+) for a few unit-cell thick films. First-principles layer-resolved calculations of the potential energy across the nominal LaNiO3/SrTiO3 interface confirm that the oxygen vacancies can efficiently reduce the electric field at the interface.« less

  5. Polarity compensation in ultra-thin films of complex oxides: The case of a perovskite nickelate

    SciTech Connect (OSTI)

    Middey, S.; Rivero, P.; Meyers, D.; Kareev, M.; Liu, X.; Cao, Y.; Freeland, J. W.; Barraza-Lopez, S.; Chakhalian, J.

    2014-10-29

    We address the fundamental issue of growth of perovskite ultra-thin films under the condition of a strong polar mismatch at the heterointerface exemplified by the growth of a correlated metal LaNiO3 on the band insulator SrTiO3 along the pseudo cubic [111] direction. While in general the metallic LaNiO3 film can effectively screen this polarity mismatch, we establish that in the ultra-thin limit, films are insulating in nature and require additional chemical and structural reconstruction to compensate for such mismatch. A combination of in-situ reflection high-energy electron diffraction recorded during the growth, X-ray diffraction, and synchrotron based resonant X-ray spectroscopy reveal the formation of a chemical phase La2Ni2O5 (Ni2+) for a few unit-cell thick films. First-principles layer-resolved calculations of the potential energy across the nominal LaNiO3/SrTiO3 interface confirm that the oxygen vacancies can efficiently reduce the electric field at the interface.

  6. Long-Range And Head-On Beam-Beam Compensation Studies in RHIC With Lessons for the LHC

    SciTech Connect (OSTI)

    Fischer, W.; Luo, Y.; Abreu, N.; Calaga, R.; Montag, C.; Robert-Demolaize, G.; Dorda, U.; Koutchouk, J.P.; Sterbini, G.; Zimmermann, F.; Kim, H.J.; Sen, T.; Shiltsev, V.; Valishev, A.; Qiang, J.; Kabel, A.; /SLAC

    2011-11-28

    Long-range as well as head-on beam-beam effects are expected to limit the LHC performance with design parameters. They are are also important consideration for the LHC upgrades. To mitigate long-range effects, current carrying wires parallel to the beam were proposed. Two such wires are installed in RHIC where they allow studying the effect of strong long-range beam-beam effects, as well as the compensation of a single long-range interaction. The tests provide benchmark data for simulations and analytical treatments. Electron lenses were proposed for both RHIC and the LHC to reduce the head-on beam-beam effect. We present the experimental long-range beam-beam program at RHIC and report on head-on compensations studies based on simulations.

  7. Long-range and head-on beam-beam compensation studies in RHIC with lessons for the LHC

    SciTech Connect (OSTI)

    Fischer, W.; Luo, Y.; Abreu, N.; Calaga, R.; Montag, C.; Robert-Demolaize, G.; Dorda, U.; Koutchouk, J.-P.; Sterbini, G.; Zimmermann, F.; Kim, H.-J.; Sen, T.; Shiltsev, V.; Valishev, A.; Qiang, J.; Kabel, A.

    2009-01-12

    Long-range as well as head-on beam-beam effects are expected to limit the LHC performance with design parameters. They are also important consideration for the LHC upgrades. To mitigate long-range effects, current carrying wires parallel to the beam were proposed. Two such wires are installed in RHIC where they allow studying the effect of strong long-range beam-beam effects, as well as the compensation of a single long-range interaction. The tests provide benchmark data for simulations and analytical treatments. Electron lenses were proposed for both RHIC and the LHC to reduce the head-on beam-beam effect. We present the experimental long-range beam-beam program at RHIC and report on head-on compensations studies based on simulations.

  8. Long-range and head-on beam-beam compensation studies in RHIC with lessons for the LHC

    SciTech Connect (OSTI)

    Fischer,W.; Luo, Y.; Abreu, N.; Calaga, R.; Montag, C.; Robert-Demolaize, G.; Dorda, U.; Koutchouk, J. -P.; Sterbini, G.; Zimmermann, F.; Kim, H. -J.; Sen, T.; Shiltsev, V.; Valishev, A.; Qiang, J.; Kabel, A.

    2008-11-24

    Long-range as well as head-on beam-beam effects are expected to limit the LHC performance with design parameters. They are also important consideration for the LHC upgrades. To mitigate long-range effects current carrying wires parallel to the beam were proposed. Two such wires are installed in RHIC where they allow studying the effect of strong long-range beam-beam effects, as well as the compensation of a single long-range interaction. The tests provide benchmark data for simulations and analytical treatments. To reduce the head-on beam-beam effect electron lenses were proposed for both RIDC and the LHC. We present the experimental long-range beam-beam program at RHIC and report on head-on compensations studies based on simulations.

  9. 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

    2015-01-01

    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.

  10. 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.

    2008-06-23

    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.

  11. 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)

    2013-03-25

    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.

  12. The incidence of popular complaints of farmers on land compensation : a case study of two villages in Dalian, Liaoning Province, China

    E-Print Network [OSTI]

    Li, Li, S.M. (Massachusetts Institute of Technology)

    2006-01-01

    The thesis analyzed the reason for the incidence of lodging popular complaints triggered by a land requisition in two villages in Dalian, Liaoning Province, China. The thesis only took the popular protests on land compensation ...

  13. 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)

    2013-06-10

    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.

  14. 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

    2006-05-16

    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.

  15. Sandia Energy - Chemical Dynamics

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

    Chemical Dynamics Home Transportation Energy Predictive Simulation of Engines Combustion Chemistry Chemical Dynamics Chemical DynamicsAshley Otero2015-10-28T02:45:37+00:00...

  16. 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

  17. 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

    2012-05-08

    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.

  18. 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

    2007-01-01

    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.

  19. The Property Value Protection Program - How the Compensation Plan is Working and Evolving to Meet Changing Needs - 13149

    SciTech Connect (OSTI)

    Faught, Jeff; Herod, Judy; Mahabir, Alexandra

    2013-07-01

    The Property Value Protection (PVP) Program offers an innovative approach to address the risk of individual property value loss resulting from the cleanup and long-term management of historic low level radioactive waste in the Port Hope area in Southern Ontario, Canada. This cleanup is taking place through the Port Hope Area Initiative (PHAI), a federally sponsored waste remediation project. The PVP Program came into effect on October 1, 2000, having been established as a key element of the PHAI Legal Agreement between the Government of Canada and the municipalities of Port Hope and Clarington. The PVP Program was designed in direct response to the concern expressed by the agreement's two municipal signatories that protection of local property owners from the risk of property value loss was critical to their acceptance of the Port Hope and Port Granby projects. The PVP Program compensates owners of residential, commercial or industrial properties for a loss in fair market value on the sale or rental of their properties. Increased mortgage refinancing costs and expenses incurred as a result of delayed sales that can be attributed to the Port Hope Area Initiative are also compensated. (authors)

  20. Study of beam loading and its compensation in the Compact Ultrafast Terahertz Free-Electron Laser injector linac

    SciTech Connect (OSTI)

    Lal, Shankar Pant, K. K.

    2014-12-15

    The RF properties of an accelerating structure, and the pulse structure and charge per bunch in the electron beam propagating through it are important parameters that determine the impact of beam loading in the structure. The injector linac of the Compact Ultrafast Terahertz Free-Electron Laser (CUTE-FEL) has been operated with two different pulse structures during initial commissioning experiments and the effect of beam loading on the accelerated electron beam parameters has been studied analytically for these two pulse structures. This paper discusses the analytical study of beam loading in a Standing Wave, Plane Wave Transformer linac employed in the CUTE-FEL setup, and a possible technique for its compensation for the electron beam parameters of the CUTE-FEL. A parametric study has been performed to study beam loading for different beam currents and to optimize injection time of the electron beam to compensate beam loading. Results from the parametric study have also been used to explain previously observed results from acceleration experiments in the CUTE-FEL setup.

  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

    2014-07-08

    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. 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)

    2014-02-15

    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.

  3. Ion bunch length effects on the beam-beam interaction and its compensation in a high-luminosity ring-ring electron-ion collider

    SciTech Connect (OSTI)

    Montag C.; Oeftiger, A.; Fischer, W.

    2012-05-20

    One of the luminosity limits in a ring-ring electron-ion collider is the beam-beam effect on the electrons. In the limit of short ion bunches, simulation studies have shown that this limit can be significantly increased by head-on beam-beam compensation with an electron lens. However, with an ion bunch length comparable to the beta-function at the IP in conjunction with a large beam-beam parameter, the electrons perform a sizeable fraction of a betatron oscillation period inside the long ion bunches. We present recent simulation results on the compensation of this beam-beam interaction with multiple electron lenses.

  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

    2014-07-15

    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 Microscopic Linear Dynamics

    E-Print Network [OSTI]

    Penny, Will

    The Microscopic Brain Will Penny Linear Dynamics Exponentials Matrix Exponential Eigendecomposition References The Microscopic Brain Will Penny 7th April 2011 #12;The Microscopic Brain Will Penny Linear;The Microscopic Brain Will Penny Linear Dynamics Exponentials Matrix Exponential Eigendecomposition

  6. 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

  7. Intramolecular and nonlinear dynamics

    SciTech Connect (OSTI)

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

    1993-12-01

    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.

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

    SciTech Connect (OSTI)

    Saeki, Hiroshi Magome, Tamotsu

    2014-10-06

    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.

  9. 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

    1963-01-01

    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...

  10. Introduction Dynamical properties of (-)-transformation Dynamical properties of

    E-Print Network [OSTI]

    /04/2010 Digital expansions, dynamics and tilings, Aussois Dynamical properties of the (-)-transformation 1/17 #12 of (-)-transformation Digital expansions, dynamics and tilings, Aussois Dynamical properties of the (-)-transformation 2/17 #12;Introduction Dynamical properties of (-)-transformation Introduction Digital expansions, dynamics

  11. Injured? Workers' Compensation Flow Chart Please contact Risk Management and Safety if assistance is needed, 895-5404 or 895-4226, rms.unlv.edu

    E-Print Network [OSTI]

    Walker, Lawrence R.

    Injured? Workers' Compensation Flow Chart Please contact Risk Management and Safety if assistance is able. The C-1 form is sent/faxed to Risk Management and Safety as soon as possible. Supervisor to the appropriate Safety Office Employee completes the C-1 form. The C-1 form is sent/faxed to Risk Management

  12. Field calculations, single-particle tracking, and beam dynamics with space charge in the electron lens for the Fermilab Integrable Optics Test Accelerator

    SciTech Connect (OSTI)

    Noll, Daniel; Stancari, Giulio

    2015-11-17

    An electron lens is planned for the Fermilab Integrable Optics Test Accelerator as a nonlinear element for integrable dynamics, as an electron cooler, and as an electron trap to study space-charge compensation in rings. We present the main design principles and constraints for nonlinear integrable optics. A magnetic configuration of the solenoids and of the toroidal section is laid out. Singleparticle tracking is used to optimize the electron path. Electron beam dynamics at high intensity is calculated with a particle-in-cell code to estimate current limits, profile distortions, and the effects on the circulating beam. In the conclusions, we summarize the main findings and list directions for further work.

  13. 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

    2011-07-15

    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.

  14. Dynamical principles in neuroscience

    SciTech Connect (OSTI)

    Rabinovich, Mikhail I.; Varona, Pablo; Selverston, Allen I.; Abarbanel, Henry D. I.

    2006-10-15

    Dynamical modeling of neural systems and brain functions has a history of success over the last half century. This includes, for example, the explanation and prediction of some features of neural rhythmic behaviors. Many interesting dynamical models of learning and memory based on physiological experiments have been suggested over the last two decades. Dynamical models even of consciousness now exist. Usually these models and results are based on traditional approaches and paradigms of nonlinear dynamics including dynamical chaos. Neural systems are, however, an unusual subject for nonlinear dynamics for several reasons: (i) Even the simplest neural network, with only a few neurons and synaptic connections, has an enormous number of variables and control parameters. These make neural systems adaptive and flexible, and are critical to their biological function. (ii) In contrast to traditional physical systems described by well-known basic principles, first principles governing the dynamics of neural systems are unknown. (iii) Many different neural systems exhibit similar dynamics despite having different architectures and different levels of complexity. (iv) The network architecture and connection strengths are usually not known in detail and therefore the dynamical analysis must, in some sense, be probabilistic. (v) Since nervous systems are able to organize behavior based on sensory inputs, the dynamical modeling of these systems has to explain the transformation of temporal information into combinatorial or combinatorial-temporal codes, and vice versa, for memory and recognition. In this review these problems are discussed in the context of addressing the stimulating questions: What can neuroscience learn from nonlinear dynamics, and what can nonlinear dynamics learn from neuroscience?.

  15. Compensation of Wave-Induced Motion and Force Phenomena for Ship-Based High Performance Robotic and Human Amplifying Systems

    SciTech Connect (OSTI)

    Love, LJL

    2003-09-24

    The decrease in manpower and increase in material handling needs on many Naval vessels provides the motivation to explore the modeling and control of Naval robotic and robotic assistive devices. This report addresses the design, modeling, control and analysis of position and force controlled robotic systems operating on the deck of a moving ship. First we provide background information that quantifies the motion of the ship, both in terms of frequency and amplitude. We then formulate the motion of the ship in terms of homogeneous transforms. This transformation provides a link between the motion of the ship and the base of a manipulator. We model the kinematics of a manipulator as a serial extension of the ship motion. We then show how to use these transforms to formulate the kinetic and potential energy of a general, multi-degree of freedom manipulator moving on a ship. As a demonstration, we consider two examples: a one degree-of-freedom system experiencing three sea states operating in a plane to verify the methodology and a 3 degree of freedom system experiencing all six degrees of ship motion to illustrate the ease of computation and complexity of the solution. The first series of simulations explore the impact wave motion has on tracking performance of a position controlled robot. We provide a preliminary comparison between conventional linear control and Repetitive Learning Control (RLC) and show how fixed time delay RLC breaks down due to the varying nature wave disturbance frequency. Next, we explore the impact wave motion disturbances have on Human Amplification Technology (HAT). We begin with a description of the traditional HAT control methodology. Simulations show that the motion of the base of the robot, due to ship motion, generates disturbances forces reflected to the operator that significantly degrade the positioning accuracy and resolution at higher sea states. As with position-controlled manipulators, augmenting the control with a Repetitive Learning Controller has little impact due to the variable nature of the wave period. We then introduce a new approach to HAT control, Ship Motion Compensation for Force Control Systems (SMCFCS). This basic approach uses inclinometer and acceleration information from the base of the robot to compensate for ship motion disturbances. Results of the simulation study show over an order of magnitude decrease in the disturbance force reflected back to the operator and an order of magnitude increase in positioning accuracy and resolution.

  16. Dynamic Instruction Fusion

    E-Print Network [OSTI]

    Lee, Ian

    2012-01-01

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

  17. Elliptical Galaxy Dynamics

    E-Print Network [OSTI]

    David Merritt

    1998-11-06

    A review of elliptical galaxy dynamics, with a focus on nonintegrable models. Topics covered include torus construction; modelling axisymmetric galaxies; triaxiality; collisionless relaxation; and collective instabilities.

  18. Efficient algorithm for locating and sizing series compensation devices in large power transmission grids: I. Model implementation

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

    Frolov, Vladimir; Backhaus, Scott; Chertkov, Misha

    2014-10-24

    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 Polishmore »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.« less

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

    SciTech Connect (OSTI)

    Frolov, Vladimir; Backhaus, Scott N.; Chertkov, Michael

    2014-01-14

    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.

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

    SciTech Connect (OSTI)

    Frolov, Vladimir; Backhaus, Scott N.; Chertkov, Michael

    2014-01-14

    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

  1. 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

    2010-12-09

    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.

  2. Efficient algorithm for locating and sizing series compensation devices in large power transmission grids: II. Solutions and applications

    SciTech Connect (OSTI)

    Frolov, Vladimir; Backhaus, Scott; Chertkov, Misha

    2014-10-01

    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.

  3. Efficient algorithm for locating and sizing series compensation devices in large power transmission grids: II. Solutions and applications

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

    Frolov, Vladimir; Backhaus, Scott; Chertkov, Misha

    2014-10-01

    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 Polishmore »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.« less

  4. Electromagnetic Wave Dynamics in

    E-Print Network [OSTI]

    Kaiser, Robin

    Mesoscopic Electromagnetic Wave Dynamics in Ultracold Atomic Gases Robin Kaiser and Mark D. Havey Mesoscopic Electromagnetic Wave Dynamics in Ultracold Atomic Gases #12;39 E xperimental developments permit in the transport proper- ties of electromagnetic radiation in strongly scattering random media. Even in weakly

  5. Tree Mortality following Prescribed Fire and a Storm Surge Event in Slash Pine ( Pinus elliottii var. densa ) Forests in the Florida Keys, USA

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

    Sah, Jay P.; Ross, Michael S.; Snyder, James R.; Ogurcak, Danielle E.

    2010-01-01

    In fire-dependent forests, managers are interested in predicting the consequences of prescribed burning on postfire tree mortality. We examined the effects of prescribed fire on tree mortality in Florida Keys pine forests, using a factorial design with understory type, season, and year of burn as factors. We also used logistic regression to model the effects of burn season, fire severity, and tree dimensions on individual tree mortality. Despite limited statistical power due to problems in carrying out the full suite of planned experimental burns, associations with tree and fire variables were observed. Post-fire pine tree mortality was negatively correlated withmore »tree size and positively correlated with char height and percent crown scorch. Unlike post-fire mortality, tree mortality associated with storm surge from Hurricane Wilma was greater in the large size classes. Due to their influence on population structure and fuel dynamics, the size-selective mortality patterns following fire and storm surge have practical importance for using fire as a management tool in Florida Keys pinelands in the future, particularly when the threats to their continued existence from tropical storms and sea level rise are expected to increase.« less

  6. Skyrmion Dynamics for Spintronic Devices

    E-Print Network [OSTI]

    Liu, Yizhou

    2013-01-01

    Skyrmion Dynamics for Spintronic Devices A Thesis submittedSkyrmion Dynamics for Spintronic Devices by Yizhou Liua candidate for future spintronic devices. However, Skyrmion

  7. 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)

    2013-04-15

    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.

  8. Dynamic Positioning Simulator Dynamic Positioning Simulator

    E-Print Network [OSTI]

    Vuik, Kees

    to the ocean floor, without using anchors accomplished by two or more propulsive devices controlled by inputs Dynamic Positioning: No tugboats needed; Offshore set-up is quick; Power saving; Precision situations more on Ship: Wind Force Fw = 1 2 air V 2 rw CXw (rw )AT 1 2 air V 2 rw CYw (rw )AL Mw = 1 2 air V 2 rw CMw (rw

  9. Quasistatic dynamical systems

    E-Print Network [OSTI]

    Neil Dobbs; Mikko Stenlund

    2015-04-08

    We introduce the notion of a quasistatic dynamical system, which generalizes that of an ordinary dynamical system. Quasistatic dynamical systems are inspired by the namesake processes in thermodynamics, which are idealized processes where the observed system transforms (infinitesimally) slowly due to external influence, tracing out a continuous path of thermodynamic equilibria over an (infinitely) long time span. Time-evolution of states under a quasistatic dynamical system is entirely deterministic, but choosing the initial state randomly renders the process a stochastic one. In the prototypical setting where the time-evolution is specified by strongly chaotic maps on the circle, we obtain a description of the statistical behaviour as a stochastic diffusion process, under surprisingly mild conditions on the initial distribution, by solving a well-posed martingale problem. We also consider various admissible ways of centering the process, with the curious conclusion that the "obvious" centering suggested by the initial distribution sometimes fails to yield the expected diffusion.

  10. Dynamics of Nanoconfined Acetonitrile

    E-Print Network [OSTI]

    Norton, Cassandra

    2011-04-27

    components of interest in the simulations are the diffusion coefficients and reorientational correlation times, two dynamical constants of a given system, and the causes of the magnitudes and variability of each is explored. The acetonitrile molecules...

  11. Nanoindentation Under Dynamic Conditions

    E-Print Network [OSTI]

    Wheeler, Jeffrey M

    2009-05-22

    and in analysis of the resulting data. Recent development has enabled investigation of materials under several dynamic conditions. The palladium-hydrogen system has a large miscibility gap, where the palladium lattice rapidly expands to form a hydrogen-rich ?...

  12. Photochemical reaction dynamics

    SciTech Connect (OSTI)

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

    1993-12-01

    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.

  13. 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

  14. Power-Factor Compensation

    E-Print Network [OSTI]

    Stankoviæ, Aleksandar

    and inductors as well as power elec- tronic converters, such as active filters and flexible ac transmission- tures the energy-transmission efficiency for a given load. The standard approach to improving the power of nonsinusoidal signals in energy networks at all power levels. An unfortunate consequence of the inclu- sion

  15. How a Vicinal Layer of Solvent Modulates the Dynamics of Proteins

    E-Print Network [OSTI]

    C. Atilgan; A. O. Aykut; A. R. Atilgan

    2007-07-11

    The dynamics of a folded protein is studied in water and glycerol at a series of temperatures below and above their respective dynamical transition. The system is modeled in two distinct states whereby the protein is decoupled from the bulk solvent at low temperatures, and communicates with it through a vicinal layer at physiological temperatures. A linear viscoelastic model elucidates the less-than-expected increase in the relaxation times observed in the backbone dynamics of the protein. The model further explains the increase in the flexibility of the protein once the transition takes place and the differences in the flexibility under the different solvent environments. Coupling between the vicinal layer and the protein fluctuations is necessary to interpret these observations. The vicinal layer is postulated to form once a threshold for the volumetric fluctuations in the protein to accommodate solvents of different sizes is reached. Compensation of entropic-energetic contributions from the protein-coupled vicinal layer quantifies the scaling of the dynamical transition temperatures in various solvents. The protein adapts different conformational routes for organizing the required coupling to a specific solvent, which is achieved by adjusting the amount of conformational jumps in the surface-group dihedrals.

  16. Dynamic control of rotating stall in axial flow compressors using aeromechanical feedback

    SciTech Connect (OSTI)

    Gysling, D.L.; Greitzer, E.M.

    1995-07-01

    Dynamic control of rotating stall in an axial flow compressor has been implemented using aeromechanical feedback. The control strategy developed used an array of wall jets, upstream of a single-stage compressor, which were regulated by locally reacting reed valves. These reed valves responded to the small-amplitude flow-field pressure perturbations that precede rotating stall. The valve design was such that the combined system, compressor plus reed valve controller, was stable under operating conditions that had been unstable without feedback. A 10 percent decrease in the stalling flow coefficient was obtained using the control strategy, and the extension of stall flow range was achieved with no measurable change in the steady-state performance of the compression system. The experiments demonstrate the first use of aeromechanical feedback to extend the stable operating range of an axial flow compressor, and the first use of local feedback and dynamic compensation techniques to suppress rotating stall. The design of the experiment was based on a two-dimensional stall inception model, which incorporated the effect of the aeromechanical feedback. The physical mechanism for rotating stall in axial flow compressors was examined with focus on the role of dynamic feedback in stabilizing compression system instability. As predicted and experimentally demonstrated, the effectiveness of the aeromechanical control strategy depends on a set of nondimensional control parameters that determine the interaction of the control strategy and the rotating stall dynamics.

  17. The Dynamical Discrete Web

    E-Print Network [OSTI]

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

    2007-04-20

    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.

  18. Dynamical laser spike processing

    E-Print Network [OSTI]

    Shastri, Bhavin J; Tait, Alexander N; Rodriguez, Alejandro W; Wu, Ben; Prucnal, Paul R

    2015-01-01

    Novel materials and devices in photonics have the potential to revolutionize optical information processing, beyond conventional binary-logic approaches. Laser systems offer a rich repertoire of useful dynamical behaviors, including the excitable dynamics also found in the time-resolved "spiking" of neurons. Spiking reconciles the expressiveness and efficiency of analog processing with the robustness and scalability of digital processing. We demonstrate that graphene-coupled laser systems offer a unified low-level spike optical processing paradigm that goes well beyond previously studied laser dynamics. We show that this platform can simultaneously exhibit logic-level restoration, cascadability and input-output isolation---fundamental challenges in optical information processing. We also implement low-level spike-processing tasks that are critical for higher level processing: temporal pattern detection and stable recurrent memory. We study these properties in the context of a fiber laser system, but the addit...

  19. Dynamic Transmission Electron Microscopy

    SciTech Connect (OSTI)

    Evans, James E.; Jungjohann, K. L.; Browning, Nigel D.

    2012-10-12

    Dynamic transmission electron microscopy (DTEM) combines the benefits of high spatial resolution electron microscopy with the high temporal resolution of ultrafast lasers. The incorporation of these two components into a single instrument provides a perfect platform for in situ observations of material processes. However, previous DTEM applications have focused on observing structural changes occurring in samples exposed to high vacuum. Therefore, in order to expand the pump-probe experimental regime to more natural environmental conditions, in situ gas and liquid chambers must be coupled with Dynamic TEM. This chapter describes the current and future applications of in situ liquid DTEM to permit time-resolved atomic scale observations in an aqueous environment, Although this chapter focuses mostly on in situ liquid imaging, the same research potential exists for in situ gas experiments and the successful integration of these techniques promises new insights for understanding nanoparticle, catalyst and biological protein dynamics with unprecedented spatiotemporal resolution.

  20. Statistics of football dynamics

    E-Print Network [OSTI]

    Mendes, R S; Anteneodo, C

    2007-01-01

    We investigate the dynamics of football matches. Our goal is to characterize statistically the temporal sequence of ball movements in this collective sport game, searching for traits of complex behavior. Data were collected over a variety of matches in South American, European and World championships throughout 2005 and 2006. We show that the statistics of ball touches presents power-law tails and can be described by $q$-gamma distributions. To explain such behavior we propose a model that provides information on the characteristics of football dynamics. Furthermore, we discuss the statistics of duration of out-of-play intervals, not directly related to the previous scenario.

  1. Dynamic cable analysis models

    SciTech Connect (OSTI)

    Palo, P.A.; Meggitt, D.J.; Nordell, W.J.

    1983-05-01

    This paper presents a summary of the development and validation of undersea cable dynamics computer models by the Naval Civil Engineering Laboratory (NCEL) under the sponsorship of the Naval Facilities Engineering Command. These models allow for the analysis of both small displacement (strumming) and large displacement (static and dynamic) deformations of arbitrarily configured cable structures. All of the large displacement models described in this paper are available to the public. This paper does not emphasize the theoretical development of the models (this information is available in other references) but emphasizes the various features of the models, the comparisons between model output and experimental data, and applications for which the models have been used.

  2. Protein Dynamics and Biocatalysis

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass mapSpeedingProgramExemptionsProtein Dynamics Hit the Big Screen Protein Dynamics

  3. Introduction to Accelerated Molecular Dynamics

    SciTech Connect (OSTI)

    Perez, Danny [Los Alamos National Laboratory

    2012-07-10

    Molecular Dynamics is the numerical solution of the equations of motion of a set of atoms, given an interatomic potential V and some boundary and initial conditions. Molecular Dynamics is the largest scale model that gives unbiased dynamics [x(t),p(t)] in full atomistic detail. Molecular Dynamics: is simple; is 'exact' for classical dynamics (with respect to a given V); can be used to compute any (atomistic) thermodynamical or dynamical properties; naturally handles complexity -- the system does the right thing at the right time. The physics derives only from the interatomic potential.

  4. Speeding up dynamic compilation: concurrent and parallel dynamic compilation 

    E-Print Network [OSTI]

    Bohm, Igor

    2013-07-02

    The main challenge faced by a dynamic compilation system is to detect and translate frequently executed program regions into highly efficient native code as fast as possible. To efficiently reduce dynamic compilation ...

  5. Dynamic Systems, Measurement,

    E-Print Network [OSTI]

    Singhose, William

    Journal of Dynamic Systems, Measurement, and Control Technical Briefs Remote Vibration Control for Flexible Beams Subject to Harmonic Disturbances Shang-Teh Wu Department of Mechanical Engineering, National at the boundary are required in the control algorithm, which emulates the behavior of a set of mechanical spring

  6. LABORATORY VI ROTATIONAL DYNAMICS

    E-Print Network [OSTI]

    Minnesota, University of

    Lab VI - 1 LABORATORY VI ROTATIONAL DYNAMICS So far this semester, you have been asked to think kinematics. OBJECTIVES: Successfully completing this laboratory should enable you to: · Use linear kinematics in a laboratory on earth, before launching the satellite. EQUIPMENT You will use an apparatus that spins

  7. 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

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

    SciTech Connect (OSTI)

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

    2012-05-20

    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.

  9. A Dynamic Solar Core Model: On the Activity-Related Changes of the Neutrino Fluxes

    E-Print Network [OSTI]

    Attila Grandpierre

    1998-10-08

    The energy sources of the Sun may actually involve a thermonuclear runaway energy source present in stellar energy producing regions. I consider the conjectures of the derived model for the solar neutrino fluxes in case of a solar core allowed to vary in relation to the surface activity cycle. The observed neutrino flux data suggest a solar core possibly varying in time. In the dynamic solar model the quiet and runaway energy sources together may produce quasi-constant flux in the SuperKamiokande because it is sensitive to neutral currents, axions and anti-neutrinos, too. I calculate the contributions of the runaway source to the individual neutrino detectors. The results of the dynamic solar core model suggest that since the HOMESTAKE detects mostly the high energy electron neutrinos, therefore the HOMESTAKE data may aniticorrelate with the activity cycle. Activity correlated changes are expected to be present only marginally in the GALLEX and GNO data. The gallium detectors are sensitive mostly to the pp neutrinos, and the changes of the pp neutrinos arising from the SSM-like core is mostly compensated by the high-energy electron neutrinos produced by the hot bubbles of the dynamic energy source. The results suggest that the GALLEX data may show an anti-correlation, while the SuperKamiokande data may show a correlation with the activity cycle. Predictions of the dynamic solar model are presented for the SNO and Borexino experiments which can distinguish between the effects of the MSW mechanism and the consequences of the dynamic solar model. The results of the dynamic solar model are consistent with the present heioseismic measurements and can be checked with future heioseismic measurements as well. Keywords: solar neutrino problems - solar activity - thermonuclear runaways

  10. Shared and Dynamic Libraries on Hopper

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

    Shared and Dynamic Libraries Shared and Dynamic Libraries The Hopper system can support applications that use dynamic shared libraries (DSL) on the compute nodes. Some...

  11. Short-term and long-term reliability studies in the deregulated power systems 

    E-Print Network [OSTI]

    Li, Yishan

    2006-04-12

    then investigate new ways to improve composite power system adequacy in the long-term. Specifically, we propose to use Flexible AC Transmission Systems (FACTS) such as Thyristor Controlled Series Capacitor (TCSC), Static Var Compensator (SVC) and Thyristor...

  12. Tools for dynamic model development

    E-Print Network [OSTI]

    Schaber, Spencer Daniel

    2014-01-01

    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 ...

  13. Policy Strategies and Paths to promote Sustainable Energy Systems - The dynamic Invert Simulation Tool

    E-Print Network [OSTI]

    Stadler, Michael; Kranzl, Lukas; Huber, Claus; Haas, Reinhard; Tsioliaridou, Elena

    2006-01-01

    which considers a rebound in energy consumption due torebound effect which leads to a partly compensation of energy

  14. Entanglement dynamics in chaotic systems

    SciTech Connect (OSTI)

    Ghose, Shohini [Institute for Quantum Information Science, University of Calgary, Alberta, T2N 1N4 (Canada); Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131 (United States); Sanders, Barry C. [Institute for Quantum Information Science, University of Calgary, Alberta, T2N 1N4 (Canada); Centre for Quantum Computer Technology, Macquarie University, Sydney, New South Wales (Australia)

    2004-12-01

    We study quantum chaos for systems with more than one degree of freedom, for which we present an analysis of the dynamics of entanglement. Our analysis explains the main features of entanglement dynamics and identifies entanglement-based signatures of quantum chaos. We discuss entanglement dynamics for a feasible experiment involving an atom in a magneto-optical trap and compare the results with entanglement dynamics for the well-studied quantum kicked top.

  15. Nonlinear chemical dynamics Francesc Sagusa

    E-Print Network [OSTI]

    Epstein, Irving R.

    Nonlinear chemical dynamics Francesc Saguésa and Irving R. Epsteinb a Departament de Química Física March 2003 The interdisciplinary field of nonlinear chemical dynamics has grown significantly in breadth an overview of some of the key results of nonlinear chemical dynamics, with emphasis on those areas most

  16. ANALYSING DYNAMIC FUNCTION SCHEDULING DECISIONS

    E-Print Network [OSTI]

    Harrison, Michael

    , University of York, York YO10 5DD, UK Abstract: Function allocation, as a process used in the construction, the notion of dynamic function allocation becomes increasingly desirable where in certain situations of dynamic function allocation that reflects typical work activity where the dynamic scheduling of activities

  17. Chasmanthium laxum var. sessiliflorum (Native) 3 

    E-Print Network [OSTI]

    Hugh D. Wilson

    2011-08-10

    . La diversificaci?n es menos riesgosa que utilizar todos los recursos que uno posee en una sola empresa. La diversifi- caci?n puede distribuir tambi?n los costos de operaci?n m?s ampliamente y reducir el efecto de condiciones ambientales extremas. Al... producci?n estimada por unidad, el valor probable por unidad, y los costos de producci?n esperados. Esta informaci?n lo ayu- dar? a desarrollar un presupuesto pr?ctico para la empre- sa, determinar qu? recursos se requieren, as? como los est?ndares fijos...

  18. Cucurbita pepo var. texana (Native) 11 

    E-Print Network [OSTI]

    Hugh D. Wilson

    2011-08-10

    Under the assumption that the only information available on a drainage basin is its mean elevation, the connection between entropy and potential energy is explored to analyze drainage basins morphological characteristics. The mean basin elevation...

  19. Cucurbita pepo var. texana (Native) 8 

    E-Print Network [OSTI]

    Hugh D. Wilson

    2011-08-10

    . ' I Decay Scheme 2. '"'U Thermal Neutron Induced Fission Reaction 3, " Te and "'"Te Decay Scheme 4 ""Te Thermal Neutron Capture 5. "I Side Reactions from Natural TeO, Neutron Irradiation. . . . Page 13 . . . 14 . . . 17 6. Dry Distillation... Equipment. . 7. NSC Facility Drawings. . 8, TRIGA Reactor Core and Pool. 19 24 9. TRIGA Reactor Core 10. Target Geometry for Shielding Calculations. . I l. "'I Production Estimates for 500 gram Te Element Target. . . . 12. Neutron Irradiation of u"Te...

  20. Infinite Dimensional VARs and Factor Models

    E-Print Network [OSTI]

    Chudik, Alexander; Pesaran, M Hashem

    numbers, N is the set of natural numbers, and Z is the set of integers. Convergence in distribution and convergence in probability is denoted by d! and p!, respectively. Symbol q:m:! represents convergence in quadratic mean and L1! stands for convergence... errors to P1 j=0#8; jut#0;j asM ! 1, namely by assuming that the process has been in operation for su¢ ciently long time before its ?rst observed realization, x1. Also for a ?nite N , when all eigenvalues of #8; lie inside the unit circle, the Euclidean...

  1. Cuscuta obtusiflora var. glandulosa (Native) 2 

    E-Print Network [OSTI]

    Robert W. Corbett

    2011-08-02

    are minute, slender-bodied insects that taper at both ends. Adults of the thrips species that attack onions are less than 1 /8 inch long and range in color from light tan or yellow to nearly black. Adult thrips have four long, slender wings fringed with long... mandible. They are generally thought to be sucking or rasping-sucking insects, but microscopic examination of damage shows that thrips actually pierce plant tissue and Figure 1. Adult (l) and immature (r) thrips. Figure 2. Onion leaf damaged by thrips...

  2. Ostrya virginiana var. virginiana (Native) 2 

    E-Print Network [OSTI]

    Hugh D. Wilson

    2011-08-10

    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...

  3. Dynamic radioactive particle source

    DOE Patents [OSTI]

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

    2012-06-26

    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.

  4. Beam Dynamics for ARIA

    SciTech Connect (OSTI)

    Ekdahl, Carl August Jr. [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2014-10-14

    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.

  5. Dynamical impurity problems

    SciTech Connect (OSTI)

    Emery, V.J. [Brookhaven National Lab., Upton, NY (United States); Kivelson, S.A. [California Univ., Los Angeles, CA (United States). Dept. of Physics

    1993-12-31

    In the past few years there has been a resurgence of interest in dynamical impurity problems, as a result of developments in the theory of correlated electron systems. The general dynamical impurity problem is a set of conduction electrons interacting with an impurity which has internal degrees of freedom. The simplest and earliest example, the Kondo problem, has attracted interest since the mid-sixties not only because of its physical importance but also as an example of a model displaying logarithmic divergences order by order in perturbation theory. It provided one of the earliest applications of the renormalization group method, which is designed to deal with just such a situation. As we shall see, the antiferromagnetic Kondo model is controlled by a strong-coupling fixed point, and the essence of the renormalization group solution is to carry out the global renormalization numerically starting from the original (weak-coupling) Hamiltonian. In these lectures, we shall describe an alternative route in which we identify an exactly solvable model which renormalizes to the same fixed point as the original dynamical impurity problem. This approach is akin to determining the critical behavior at a second order phase transition point by solving any model in a given universality class.

  6. 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

  7. Hamiltonian Dynamics of Preferential Attachment

    E-Print Network [OSTI]

    Zuev, Konstantin; Krioukov, Dmitri

    2015-01-01

    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...

  8. Symmetries in open quantum dynamics

    E-Print Network [OSTI]

    Thomas F. Jordan

    2014-08-20

    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.

  9. Mode coupling theory of electrolyte dynamics: Time dependent diffusion, dynamic structure factor and solvation dynamics

    E-Print Network [OSTI]

    Susmita Roy; Subramanian Yashonath; Biman Bagchi

    2015-01-08

    A self-consistent mode coupling theory (MCT) with microscopic inputs of equilibrium pair correlation functions is developed to analyze electrolyte dynamics. We apply the theory to calculate concentration dependence of (i) time dependent ion diffusion, (ii) dynamic structure factor of the constituent ions, and (iii) ion solvation dynamics in electrolyte solution. Brownian dynamics (BD) with implicit water molecules and molecular dynamics (MD) method with explicit water are used to check the theoretical predictions. The time dependence of ionic self-diffusion coefficient and the corresponding dynamic structure factor evaluated from our MCT approach show quantitative agreement with early experimental and present Brownian dynamic simulation results. With increasing concentration, the dispersion of electrolyte friction is found to occur at increasingly higher frequency, due to the faster relaxation of the ion atmosphere. The wave number dependence of total dynamic structure factor F(k,t), exhibits markedly different relaxation dynamics at different length scales. At small wave numbers, we find the emergence of a step-like relaxation, indicating the presence of both fast and slow time scales in the system. Such behaviour allows an intriguing analogy with temperature dependent relaxation dynamics of supercooled liquids. We find that solvation dynamics of a tagged ion exhibits a power law decay at long times- the decay can also be fitted to a stretched exponential form. The emergence of the power law in solvation dynamics has been tested by carrying out long Brownian dynamics simulations with varying ionic concentrations. This solvation time correlation and ion-ion dynamic structure factor indeed exhibits highly interesting, non-trivial dynamical behaviour at intermediate to longer times that require further experimental and theoretical studies.

  10. Dynamic Positioning Systems Usability and Interaction Styles

    E-Print Network [OSTI]

    Dunlop, Mark D.

    manually by manipulating the propulsion system, which included different types of thrusters and propellers position, a system was developed which automatically compensated to natural forces such as waves, wind, position reference sensors, gyro compasses (detects true north by using an electrically powered fast

  11. Temporal characterization of a time-compensated monochromator for high-efficiency selection of extreme-ultraviolet pulses generated by high-order harmonics

    SciTech Connect (OSTI)

    Poletto, L.; Villoresi, P.; Benedetti, E.; Ferrari, F.; Stagira, S.; Sansone, G.; Nisoli, M.

    2008-07-15

    Ultrafast extreme-ultraviolet pulses are spectrally selected by a time-delay-compensated grating monochromator. The intrinsic very short duration of the pulses is obtained by exploiting the high-order harmonic generation process. The temporal characterization of the harmonic pulses is obtained using a cross-correlation method: pulses as short as 8 fs are measured at the output of the monochromator in the case of the 23rd harmonic. This value is in agreement with the expected duration of such pulses, indicating that the influence of the monochromator is negligible. The photon flux has been measured with a calibrated photodiode, pointing out the good efficiency of the monochromator, derived by the exploitation for the two gratings of the conical diffraction mounting.

  12. Fermi level control of compensating point defects during metalorganic chemical vapor deposition growth of Si-doped AlGaN

    SciTech Connect (OSTI)

    Bryan, Z; Bryan, I; Gaddy, BE; Reddy, P; Hussey, L; Bobea, M; Guo, W; Hoffmann, M; Kirste, R; Tweedie, J; Gerhold, M; Irving, DL; Sitar, Z; Collazo, R

    2014-12-01

    A Fermi-level control scheme for point defect management using above-bandgap UV illumination during growth is presented. We propose an extension to the analogy between the Fermi level and the electrochemical potential such that the electrochemical potential of a charged defect in a material with steady-state populations of free charge carriers may be expressed in terms of the quasi-Fermi levels. A series of highly Si-doped Al0.65Ga0.35N films grown by metalorganic chemical vapor deposition with and without UV illumination showed that samples grown under UV illumination had increased free carrier concentration, free carrier mobility, and reduced midgap photoluminescence all indicating a reduction in compensating point defects. (c) 2014 AIP Publishing LLC.

  13. Dynamics of Motivations

    E-Print Network [OSTI]

    Knoll, Jörn

    ) - Upot, f mean field = C(f(x, p, t)) Collision Term = p2 2m - Upot(x, p) dp1dp2dp3 d d (1 - f)f1(1 - f2, t)) Collision Term = p2 2m - Upot(x, p) dp1dp2dp3 d d (1 - f)f1(1 - f2)f3 + loss term. Voskresensky1,3 1GSI 2Kurchatov Inst. (Moscow) 3Moscow Ins. for Physics and Engineering #12;Dynamics

  14. Jets, Lifts and Dynamics

    E-Print Network [OSTI]

    O?ul Esen; Hasan Gümral

    2010-11-03

    We show that complete cotangent lifts of vector fields, their decomposition into vertical representative and holonomic part provide a geometrical framework underlying Eulerian equations of continuum mechanics. We discuss Euler equations for ideal incompressible fluid and Vlasov equations of plasma dynamics in connection with the lifts of divergence-free and Hamiltonian vector fields, respectively. As a further application, we obtain kinetic equations of particles moving with the flow of contact vector fields both from Lie-Poisson reductions and with the techniques of present framework.

  15. 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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submit theCovalentLaboratory |Sectorfor $1.14 Per1-ENuclearDynamic Switching

  16. Discrete-Time Poles and Dynamics of Discontinuous Mode Boost and Buck Converters Under Various Control Schemes

    E-Print Network [OSTI]

    Chung-Chieh Fang

    2012-11-19

    Nonlinear systems, such as switching DC-DC boost or buck converters, have rich dynamics. A simple one-dimensional discrete-time model is used to analyze the boost or buck converter in discontinuous conduction mode. Seven different control schemes (open-loop power stage, voltage mode control, current mode control, constant power load, constant current load, constant-on-time control, and boundary conduction mode) are analyzed systematically. The linearized dynamics is obtained simply by taking partial derivatives with respect to dynamic variables. In the discrete-time model, there is only a single pole and no zero. The single closed-loop pole is a linear combination of three terms: the open-loop pole, a term due to the control scheme, and a term due to the non-resistive load. Even with a single pole, the phase response of the discrete-time model can go beyond -90 degrees as in the two-pole average models. In the boost converter with a resistive load under current mode control, adding the compensating ramp has no effect on the pole location. Increasing the ramp slope decreases the DC gain of control-to-output transfer function and increases the audio-susceptibility. Similar analysis is applied to the buck converter with a non-resistive load or variable switching frequency. The derived dynamics agrees closely with the exact switching model and the past research results.

  17. Dynamic Bertrand Oligopoly

    SciTech Connect (OSTI)

    Ledvina, Andrew, E-mail: aledvina@princeton.edu; Sircar, Ronnie, E-mail: sircar@princeton.ed [Princeton University, ORFE Department (United States)

    2011-02-15

    We study continuous time Bertrand oligopolies in which a small number of firms producing similar goods compete with one another by setting prices. We first analyze a static version of this game in order to better understand the strategies played in the dynamic setting. Within the static game, we characterize the Nash equilibrium when there are N players with heterogeneous costs. In the dynamic game with uncertain market demand, firms of different sizes have different lifetime capacities which deplete over time according to the market demand for their good. We setup the nonzero-sum stochastic differential game and its associated system of HJB partial differential equations in the case of linear demand functions. We characterize certain qualitative features of the game using an asymptotic approximation in the limit of small competition. The equilibrium of the game is further studied using numerical solutions. We find that consumers benefit the most when a market is structured with many firms of the same relative size producing highly substitutable goods. However, a large degree of substitutability does not always lead to large drops in price, for example when two firms have a large difference in their size.

  18. Los Alamos Dynamics Summer School

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

    School Los Alamos Dynamics Summer School Overview Contact Institute Director Charles Farrar (505) 663-5330 Email Professional Staff Assistant Jutta Kayser (505) 663-5649 Email...

  19. Dynamically Responsive Infrared Window Coatings

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

    Dynamically Responsive Infrared Window Coatings 2015 Building Technologies Office Peer Review Dr. Kyle J. Alvine, kyle.alvine@pnnl.gov Pacific Northwest National Laboratory 21C...

  20. Algorithms for dynamical overlap fermions

    E-Print Network [OSTI]

    Stefan Schaefer

    2006-09-28

    An overview of the current status of algorithmic approaches to dynamical overlap fermions is given. In particular the issue of changing the topological sector is discussed.

  1. Nuclear Matter and Nuclear Dynamics

    E-Print Network [OSTI]

    M Colonna

    2009-02-26

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

  2. Dynamic bed reactor

    DOE Patents [OSTI]

    Stormo, Keith E. (Moscow, ID)

    1996-07-02

    A dynamic bed reactor is disclosed in which a compressible open cell foam matrix is periodically compressed and expanded to move a liquid or fluid through the matrix. In preferred embodiments, the matrix contains an active material such as an enzyme, biological cell, chelating agent, oligonucleotide, adsorbent or other material that acts upon the liquid or fluid passing through the matrix. The active material may be physically immobilized in the matrix, or attached by covalent or ionic bonds. Microbeads, substantially all of which have diameters less than 50 microns, can be used to immobilize the active material in the matrix and further improve reactor efficiency. A particularly preferred matrix is made of open cell polyurethane foam, which adsorbs pollutants such as polychlorophenol or o-nitrophenol. The reactors of the present invention allow unidirectional non-laminar flow through the matrix, and promote intimate exposure of liquid reactants to active agents such as microorganisms immobilized in the matrix.

  3. Quasifission dynamics in TDHF

    E-Print Network [OSTI]

    Umar, A S; Simenel, C

    2015-01-01

    For light and medium mass systems the capture cross-section may be considered to be the same as that for complete fusion, whereas for heavy systems leading to superheavy formations the evaporation residue cross-section is dramatically reduced due to the quasifission (QF) and fusion-fission processes thus making the capture cross-section to be essentially the sum of these two cross-sections, with QF occurring at a much shorter time-scale. Consequently, quasifission is the primary reaction mechanism that limits the formation of superheavy nuclei. Within the last few years the time-dependent Hartree-Fock (TDHF) approach has been utilized for studying the dynamics of quasifission. The study of quasifission is showing a great promise to provide insight based on very favorable comparisons with experimental data. In this article we will focus on the TDHF calculations of quasifission observables for the $^{48}$Ca+$^{249}$Bk system.

  4. Dynamical Yukawa Couplings

    E-Print Network [OSTI]

    Rodrigo Alonso

    2013-07-07

    The matter content of the Standard Model admits a global symmetry due to the generational structure of the spectrum respected by all interactions except for fermion couplings to the Higgs doublet. This symmetry is identified as the largest possible global symmetry of the free theory and extended to the case of massive neutrinos. The violation of such symmetry is then assumed dynamical and the value of the Yukawa couplings is fixed by a variational principle. This ansatz yields compelling results: Quark Yukawas naturally accommodate hierarchical masses and small mixing whereas Lepton Yukawas exhibit a hierarchical pattern for charged leptons and simultaneously degeneracy in the neutrino sector correlated with large mixing and Majorana phases. The difference in the mixing patterns of Quark and Leptons in this scheme stem from the Dirac vs Majorana nature of fermions.

  5. Hamiltonian Dynamics of Preferential Attachment

    E-Print Network [OSTI]

    Konstantin Zuev; Fragkiskos Papadopoulos; Dmitri Krioukov

    2015-04-29

    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.

  6. Dynamic Coupling Measurement for Object-

    E-Print Network [OSTI]

    Bae, Doo-Hwan

    Dynamic Coupling Measurement for Object- Oriented Software Dynamic Coupling Measurement for Object- Oriented SoftwareErik Arisholm, Lionel C. Briand, Audun Foyen IEEE Transaction on Software Engineering/2)Introduction (1/2) Extensive research related to quality of OO software has performed Define structural metrics

  7. Status of dynamical ensemble generation

    E-Print Network [OSTI]

    Chulwoo Jung

    2010-01-06

    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.

  8. Dynamics and Equilibria Sergiu Hart

    E-Print Network [OSTI]

    Naor, Moni

    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 AND EQUILIBRIA Sergiu Hart Center for the Study of Rationality Dept of Economics Dept of Mathematics The Hebrew

  9. When do we need to account for the geometric phase in excited state dynamics?

    SciTech Connect (OSTI)

    Ryabinkin, Ilya G.; Joubert-Doriol, Loïc; Izmaylov, Artur F.

    2014-06-07

    We investigate the role of the geometric phase (GP) in an internal conversion process when the system changes its electronic state by passing through a conical intersection (CI). Local analysis of a two-dimensional linear vibronic coupling (LVC) model Hamiltonian near the CI shows that the role of the GP is twofold. First, it compensates for a repulsion created by the so-called diagonal Born–Oppenheimer correction. Second, the GP enhances the non-adiabatic transition probability for a wave-packet part that experiences a central collision with the CI. To assess the significance of both GP contributions we propose two indicators that can be computed from parameters of electronic surfaces and initial conditions. To generalize our analysis to N-dimensional systems we introduce a reduction of a general N-dimensional LVC model to an effective 2D LVC model using a mode transformation that preserves short-time dynamics of the original N-dimensional model. Using examples of the bis(methylene) adamantyl and butatriene cations, and the pyrazine molecule we have demonstrated that their effective 2D models reproduce the short-time dynamics of the corresponding full dimensional models, and the introduced indicators are very reliable in assessing GP effects.

  10. Real-time dynamics for interactive environments 

    E-Print Network [OSTI]

    Timchenko, Alexander Nikolai

    2009-05-15

    . Two primary dynamic behaviors are explored: rigid body dynamics and articulated dynamics. A generalized collision response model is built for rigid bodies and articulated structures which can be adapted to other types of behaviors. The framework...

  11. 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)

    2007-05-15

    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.

  12. ICFA Beam Dynamics Newsletter

    SciTech Connect (OSTI)

    Ben-Zvi I.; Kuczewski A.; Altinbas, Z.; Beavis, D.; Belomestnykh,; Dai, J. et al

    2012-07-01

    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.

  13. Fractal dynamics of earthquakes

    SciTech Connect (OSTI)

    Bak, P.; Chen, K. [Brookhaven National Lab., Upton, NY (United States). Dept. of Physics

    1995-05-01

    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).

  14. Computational fluid dynamic applications

    SciTech Connect (OSTI)

    Chang, S.-L.; Lottes, S. A.; Zhou, C. Q.

    2000-04-03

    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.

  15. 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...

  16. 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 ...

  17. Connecting curves for dynamical systems

    E-Print Network [OSTI]

    R. Gilmore; Jean-Marc Ginoux; Timothy Jones; C. Letellier; U. S. Freitas

    2010-03-08

    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.

  18. Compensation of the long-range beam-beam interactions as a path towards new configurations for the High Luminosity LHC

    E-Print Network [OSTI]

    AUTHOR|(SzGeCERN)390904; Papaphilippou, Yannis; Shatilov, Dmitry

    2015-01-01

    Colliding bunch trains in a circular collider demands a certain crossing angle in order to separate the two beams transversely after the collision. The magnitude of this crossing angle is a complicated function of the bunch charge, the number of long-range beam-beam interactions, of ?* and type of optics (flat or round), and possible compensation or additive effects between several low-? insertions in the ring depending on the orientation of the crossing plane at each interaction point. About 15 years ago, the use of current bearing wires was proposed at CERN in order to mitigate the longrange beam-beam effects, therefore offering the possibility to minimize the crossing angle with all the beneficial effects this might have: on the luminosity performance by reducing the need for crab-cavities or lowering their voltage, on the required aperture of the final focus magnets, on the strength of the orbit corrector involved in the crossing bumps, and finally on the heat load and radiation dose deposited in the fi...

  19. 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

    1993-08-01

    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.

  20. 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)

    1996-09-01

    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.

  1. 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)

    1997-12-01

    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.

  2. Gas-phase chemical dynamics

    SciTech Connect (OSTI)

    Weston, R.E. Jr.; Sears, T.J.; Preses, J.M. [Brookhaven National Laboratory, Upton, NY (United States)

    1993-12-01

    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.

  3. Essays in dynamic general equilibrium

    E-Print Network [OSTI]

    Cao, Dân (Dân Vu?)

    2010-01-01

    This thesis consists of three chapters studying dynamic economies in general equilibrium. The first chapter considers an economy in business cycles with potentially imperfect financial markets. The second chapter investigates ...

  4. Abstract Machines for Dynamic Computation 

    E-Print Network [OSTI]

    Walton, Christopher D

    In this thesis we address the challenges associated with the provision of dynamic software architectures. These are systems in which programs are constructed from separately compiled units with a facility for the replacement ...

  5. Mantle dynamics in the Mediterranean

    E-Print Network [OSTI]

    Faccenna, Claudio

    The Mediterranean offers a unique opportunity to study the driving forces of tectonic deformation within a complex mobile belt. Lithospheric dynamics are affected by slab rollback and collision of two large, slowly moving ...

  6. Dynamical Mutation of Dark Energy

    E-Print Network [OSTI]

    L. R. Abramo; R. C. Batista; L. Liberato; R. Rosenfeld

    2008-01-03

    We discuss the intriguing possibility that dark energy may change its equation of state in situations where large dark energy fluctuations are present. We show indications of this dynamical mutation in some generic models of dark energy.

  7. Dynamical mutation of dark energy

    SciTech Connect (OSTI)

    Abramo, L. R.; Batista, R. C. [Instituto de Fisica, Universidade de Sao Paulo, CP 66318, 05315-970, Sao Paulo (Brazil); Liberato, L.; Rosenfeld, R. [Instituto de Fisica Teorica, Universidade Estadual Paulista, R. Pamplona 145, 01405-900, Sao Paulo (Brazil)

    2008-03-15

    We discuss the intriguing possibility that dark energy may change its equation of state in situations where large dark energy fluctuations are present. We show indications of this dynamical mutation in some generic models of dark energy.

  8. Qubit dynamics under alternating controls

    E-Print Network [OSTI]

    Aiello, Clarice Demarchi

    2014-01-01

    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 ...

  9. Nonlinear dynamics of hysteretic oscillators 

    E-Print Network [OSTI]

    Shekhawat, Ashivni

    2009-05-15

    The dynamic response and bifurcations of a harmonic oscillator with a hysteretic restoring force and sinusoidal excitation are investigated. A multilinear model of hysteresis is presented. A hybrid system approach is used to formulate and study...

  10. Dynamical symmetries in nuclear structure

    SciTech Connect (OSTI)

    Casten, R.F.

    1986-01-01

    In recent years the concept of dynamical symmetries in nuclei has witnessed a renaissance of interest and activity. Much of this work has been developed in the context of the Interacting Boson Approximation (or IBA) model. The appearance and properties of dynamical symmetries in nuclei will be reviewed, with emphasis on their characteristic signatures and on the role of the proton-neutron interaction in their formation, systematics and evolution. 36 refs., 20 figs.

  11. Peak mass and dynamical friction

    E-Print Network [OSTI]

    A. Del Popolo; M. Gambera

    1995-06-09

    We show how the results given by several authors relatively to the mass of a density peak are changed when small scale substructure induced by dynamical friction are taken into account. The peak mass obtained is compared to the result of Peacock \\& Heavens (1990) and to the peak mass when dynamical friction is absent to show how these effects conspire to reduce the mass accreted by the peak.

  12. Dynamical Crossover in Supercritical Water

    E-Print Network [OSTI]

    Yu. D. Fomin; V. N. Ryzhov; E. N. Tsiok; V. V. Brazhkin

    2015-02-10

    Dynamical crossover in water is studied by means of computer simulation. The crossover temperature is calculated from the behavior of velocity autocorrelation functions. The results are compared with experimental data. It is shown that the qualitative behavior of the dynamical crossover line is similar to the melting curve behavior. Importantly, the crossover line belongs to experimentally achievable $(P,T)$ region which stimulates the experimental investigation in this field.

  13. Dynamic Tides in Close Binaries

    E-Print Network [OSTI]

    B. Willems

    2005-11-10

    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.

  14. Event-driven multithreaded dynamic optimization

    E-Print Network [OSTI]

    Zhang, Weifeng

    2006-01-01

    Speci?c Optimizations . . . . . . . . . . . . . F.3. Trace Optimization Overhead . . . . . . . . . . . . . . .Dynamic Optimization . . . . . . .B. Optimizations with the

  15. Dynamic models for nonstationary signal segmentation

    E-Print Network [OSTI]

    Penny, Will

    Dynamic models for nonstationary signal segmentation William D. Penny and Stephen J. Roberts w.penny

  16. A Tariff for Reactive Power

    SciTech Connect (OSTI)

    Kueck, John D; Kirby, Brendan J; Li, Fangxing; Tufon, Christopher; Isemonger, Alan

    2008-07-01

    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.

  17. 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

    2014-01-01

    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.

  18. 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)

    1995-07-01

    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.

  19. 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

    2008-10-15

    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.

  20. Ab-Initio Molecular Dynamics

    E-Print Network [OSTI]

    Thomas D. Kühne

    2013-03-26

    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.

  1. Ab-Initio Molecular Dynamics

    E-Print Network [OSTI]

    Kühne, Thomas D

    2012-01-01

    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.

  2. Natural Dynamics for Combinatorial Optimization

    E-Print Network [OSTI]

    Ovchinnikov, Igor V

    2015-01-01

    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...

  3. Dynamics of Triaxial Stellar Systems

    E-Print Network [OSTI]

    David Merritt

    1996-11-11

    Recent work on the dynamics of triaxial stellar systems is reviewed. The motion of boxlike orbits in realistic triaxial potentials is generically stochastic. The degree to which the stochasticity manifests itself in the dynamics depends on the chaotic mixing timescale, which is a small multiple of the crossing time in triaxial models with steep cusps or massive central singularities. Low-luminosity ellipticals, which have the steepest cusps and the shortest dynamical times, are less likely than bright ellipticals to have strongly triaxial shapes. The observational evidence for triaxiality is reviewed; departures from axisymmetry in early-type galaxies are often found to be associated with evidence of recent interactions or with the presence of a bar.

  4. 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

  5. Dynamics of Block Copolymer Nanocomposites

    SciTech Connect (OSTI)

    Mochrie, Simon G. J.

    2014-09-09

    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.

  6. Theoretical studies of combustion dynamics

    SciTech Connect (OSTI)

    Bowman, J.M. [Emory Univ., Atlanta, GA (United States)

    1993-12-01

    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.

  7. Statistics as a dynamical attractor

    E-Print Network [OSTI]

    Michail Zak

    2012-08-30

    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.

  8. Dynamics of Protein Hydration Water

    E-Print Network [OSTI]

    M. Wolf; S. Emmert; R. Gulich; P. Lunkenheimer; A. Loidl

    2014-12-08

    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.

  9. Fairness and dynamic pricing: comments

    SciTech Connect (OSTI)

    Hogan, William W.

    2010-07-15

    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)

  10. Accelerator dynamics and beam aperture

    SciTech Connect (OSTI)

    Parsa, Z.

    1986-10-01

    We present an analytical method for analyzing accelerator dynamics, including higher order effects of multipoles on the beam. This formalism provides a faster alternative to particle tracking. Simplectic expressions for the emittance and phase describing the dynamical behavior of a particle in a circular accelerator are derived using second order perturbation theory (in the presence of nonlinear elements, e.g., sextupoles, octupoles). These expressions are successfully used to calculate the emittance growth, smear and linear aperture. Our findings compare well with results obtained from tracking programs. In addition perturbation to betatron tune; resonance strengths; stop bandwidth; fixed points; island width; and Chirikov criteria are calculated.

  11. 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

  12. Error Dynamics: The Dynamic Emergence of Error Avoidance and

    E-Print Network [OSTI]

    Bickhard, Mark H.

    . Standard such notions are, however, arguably limited and bad notions, being based on untenable models of learning about error and of handling error knowledge constitute a complex major theme in evolution VICARIANTS Avoiding Error. The central theme is a progressive elaboration of kinds of dynamics that manage

  13. A Preliminary Analysis of the Economics of Using Distributed Energy as a Source of Reactive Power Supply

    SciTech Connect (OSTI)

    Li, Fangxing; Kueck, John D; Rizy, D Tom; King, Thomas F

    2006-04-01

    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.

  14. Compensated amorphous silicon solar cell

    DOE Patents [OSTI]

    Devaud, Genevieve (629 S. Humphrey Ave., Oak Park, IL 60304)

    1983-01-01

    An amorphous silicon solar cell including an electrically conductive substrate, a layer of glow discharge deposited hydrogenated amorphous silicon over said substrate and having regions of differing conductivity with at least one region of intrinsic hydrogenated amorphous silicon. The layer of hydrogenated amorphous silicon has opposed first and second major surfaces where the first major surface contacts the electrically conductive substrate and an electrode for electrically contacting the second major surface. The intrinsic hydrogenated amorphous silicon region is deposited in a glow discharge with an atmosphere which includes not less than about 0.02 atom percent mono-atomic boron. An improved N.I.P. solar cell is disclosed using a BF.sub.3 doped intrinsic layer.

  15. 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...

  16. Perks and Culture Competitive compensation

    E-Print Network [OSTI]

    Ghosh, Joydeep

    Cts Information technology rotation Program: Walmart develops the latest technology to connect our stores and hardware, and optimize the retail experience for people in stores, web and mobile. Walmart Information achiever. Corporate summer Internship: Interning at Walmart is not only a unique opportunity to gain both

  17. Perks and Culture Competitive compensation

    E-Print Network [OSTI]

    Ghosh, Joydeep

    of systems to enable Chevron's digital oilfield strategy, such as a system for remotely monitoring production

  18. 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

  19. 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

  20. Dispersion-compensated fresnel lens

    DOE Patents [OSTI]

    Johnson, Kenneth C. (1215 Brewster Dr., El Cerrito, CA 94530)

    1992-01-01

    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.

  1. Compensated intruder-detection systems

    DOE Patents [OSTI]

    McNeilly, David R. (Maryville, TN); Miller, William R. (Andersonville, TN)

    1984-01-01

    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.

  2. Compensation | National Nuclear Security Administration

    National Nuclear Security Administration (NNSA)

    Life Extension Program NNSA Blog Pantex operator supports women in STEM luncheon NNSA Blog Bay Area national labs team to tackle long-standing automotive hydrogen storage challenge...

  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. Dispersion-compensated Fresnel lens

    DOE Patents [OSTI]

    Johnson, K.C.

    1992-11-03

    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.

  5. 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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room News PublicationsAuditsCluster Compatibilitydefault SignEnvironmentApril 27,groups

  6. Compensation | National Nuclear Security Administration

    National Nuclear Security Administration (NNSA)

    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 Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield Municipal Gas &SCE-SessionsSouthReport for the t-) S/,,5 'a C |

  7. 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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousMathematicsEnergyInterested Parties -DepartmentAvailableHighOffice|OrderEnergyEnergyMOXOvertime

  8. 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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformation Current HABFESOpportunitiesNERSCGrid-based29Hai AhofBureauTours HanfordHanford

  9. BFKL dynamics at hadron colliders

    E-Print Network [OSTI]

    Carlo Ewerz; Lynne H. Orr; W. James Stirling; Bryan R. Webber

    1999-12-22

    Hadron colliders can provide important tests of BFKL `small-x' dynamics. We discuss two examples of such tests, the inclusive dijet jet cross section at large rapidity separation and the number of associated `mini-jets' in Higgs boson production.

  10. Mesoscale Dynamics Spring Semester 2014

    E-Print Network [OSTI]

    Collett Jr., Jeffrey L.

    ATS 735 Mesoscale Dynamics (3 cr) Spring Semester 2014 Instructor: Richard H. Johnson, Room ATS 305: There are no required texts. The recent book Mesoscale Meteorology in Midlatitudes by Markowski and Richardson covers with mesoscale-related research. A set of notes will be made available for the course, although we will not cover

  11. Water Dynamics at Rough Interfaces

    E-Print Network [OSTI]

    Markus Rosenstihl; Kerstin Kämpf; Felix Klameth; Matthias Sattig; Michael Vogel

    2014-07-21

    We use molecular dynamics computer simulations and nuclear magnetic resonance experiments to investigate the dynamics of water at interfaces of molecular roughness and low mobility. We find that, when approaching such interfaces, the structural relaxation of water, i.e., the $\\alpha$ process, slows down even when specific attractive interactions are absent. This prominent effect is accompanied by a smooth transition from Vogel to Arrhenius temperature dependence and by a growing importance of jump events. Consistently, at protein surfaces, deviations from Arrhenius behavior are weak when free water does not exist. Furthermore, in nanoporous silica, a dynamic crossover of liquid water occurs when a fraction of solid water forms near 225 K and, hence, the liquid dynamics changes from bulk-like to interface-dominated. At sufficiently low temperatures, water exhibits a quasi-universal $\\beta$ process, which is characterized by an activation energy of $E_a\\!=\\!0.5$ eV and involves anisotropic reorientation about large angles. As a consequence of its large amplitude, the faster $\\beta$ process destroys essentially all orientational correlation, rendering observation of a possible slower $\\alpha$ process difficult in standard experiments. Nevertheless, we find indications for the existence of structural relaxation down to a glass transition of interfacial water near 185 K. Hydrated proteins show a highly restricted backbone motion with an amplitude, which decreases upon cooling and vanishes at comparable temperatures, providing evidence for a high relevance of water rearrangements in the hydration shell for secondary protein relaxations.

  12. Dynamical systems probabilistic risk assessment.

    SciTech Connect (OSTI)

    Denman, Matthew R.; Ames, Arlo Leroy

    2014-03-01

    Probabilistic Risk Assessment (PRA) is the primary tool used to risk-inform nuclear power regulatory and licensing activities. Risk-informed regulations are intended to reduce inherent conservatism in regulatory metrics (e.g., allowable operating conditions and technical specifications) which are built into the regulatory framework by quantifying both the total risk profile as well as the change in the risk profile caused by an event or action (e.g., in-service inspection procedures or power uprates). Dynamical Systems (DS) analysis has been used to understand unintended time-dependent feedbacks in both industrial and organizational settings. In dynamical systems analysis, feedback loops can be characterized and studied as a function of time to describe the changes to the reliability of plant Structures, Systems and Components (SSCs). While DS has been used in many subject areas, some even within the PRA community, it has not been applied toward creating long-time horizon, dynamic PRAs (with time scales ranging between days and decades depending upon the analysis). Understanding slowly developing dynamic effects, such as wear-out, on SSC reliabilities may be instrumental in ensuring a safely and reliably operating nuclear fleet. Improving the estimation of a plant's continuously changing risk profile will allow for more meaningful risk insights, greater stakeholder confidence in risk insights, and increased operational flexibility.

  13. Modeling Blog Dynamics Michaela Gotz

    E-Print Network [OSTI]

    Leskovec, Jure

    Modeling Blog Dynamics Michaela G¨otz Cornell University goetz@cs.cornell.edu Jure Leskovec@cs.cmu.edu Christos Faloutsos Carnegie Mellon University christos@cs.cmu.edu Abstract How do blogs produce posts? What local, underlying mech- anisms lead to the bursty temporal behaviors observed in blog networks? Earlier

  14. Partial Dynamical Symmetries in Nuclei

    E-Print Network [OSTI]

    A. Leviatan

    2000-07-26

    Partial dynamical symmetries (PDS) are shown to be relevant to the interpretation of the $K=0_2$ band and to the occurrence of F-spin multiplets of ground and scissors bands in deformed nuclei. Hamiltonians with bosonic and fermionic PDS are presented.

  15. Critical phenomena in evolutionary dynamics

    E-Print Network [OSTI]

    Manapat, Michael L. (Michael Linn)

    2010-01-01

    This thesis consists of five essays on evolutionary dynamics. In Chapters 1 and 2, we study the evolution of trust from the perspective of game theory. In the trust game, two players have a chance to win a sum of money. ...

  16. Pedestrian, Crowd, and Evacuation Dynamics

    E-Print Network [OSTI]

    Helbing, Dirk

    2013-01-01

    This contribution describes efforts to model the behavior of individual pedestrians and their interactions in crowds, which generate certain kinds of self-organized patterns of motion. Moreover, this article focusses on the dynamics of crowds in panic or evacuation situations, methods to optimize building designs for egress, and factors potentially causing the breakdown of orderly motion.

  17. Nonequilibrium Dynamics in Lattice Systems

    E-Print Network [OSTI]

    Steinhoff, Heinz-Jürgen

    Non­equilibrium Dynamics in Lattice Systems: Epitaxial Growth and Time dependent Density Functional . . . . . . . . . . . . . . . . . . . . . 9 2.3.1 Island densities . . . . . . . . . . . . . . . . . . . . . . . . 9 2.3.2 Island size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.2 Kinetic Monte Carlo Simulations . . . . . . . . . . . . . . . . . . 15 3.2.1 Multi-island

  18. Mesoscale Dynamics Spring Semester 2012

    E-Print Network [OSTI]

    Birner, Thomas

    ATS 735 Mesoscale Dynamics (3 cr) Spring Semester 2012 Instructor: Richard H. Johnson, Room ATS 305: There are no required texts. The recent book Mesoscale Meteorology in Midlatitudes by Markowski and Richardson covers with mesoscale-related research. A set of notes will be made available for the course, although we will not cover

  19. 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.

    2014-09-15

    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.

  20. DLFM library tools for large scale dynamic applications.

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

    DLFM library tools for large scale dynamic applications DLFM library tools for large scale dynamic applications Large scale Python and other dynamic applications may spend huge...

  1. Parameter and state estimation in nonlinear dynamical systems

    E-Print Network [OSTI]

    Creveling, Daniel R.

    2008-01-01

    and J. Kurths. Nonlinear dynamical system identi?ca- tionEstimation In Nonlinear Dynamical Systems A dissertationState Estimation In Nonlinear Dynamical Systems by Daniel R.

  2. Quantum Speed Limit and Optimal Control of Many-Boson Dynamics

    E-Print Network [OSTI]

    Ioannis Brouzos; Alexej I. Streltsov; Antonio Negretti; Ressa S. Said; Tommaso Caneva; Simone Montangero; Tommaso Calarco

    2015-05-12

    We extend the concept of quantum speed limit -- the minimal time needed to perform a driven evolution -- to complex interacting many-body systems. We investigate a prototypical many-body system, a bosonic Josephson junction, at increasing levels of complexity: (a) within the two-mode approximation {corresponding to} a nonlinear two-level system, (b) at the mean-field level by solving the nonlinear Gross-Pitaevskii equation in a double well potential, and (c) at an exact many-body level by solving the time-dependent many-body Schr\\"odinger equation. We propose a control protocol to transfer atoms from the ground state of a well to the ground state of the neighbouring well. Furthermore, we show that the detrimental effects of the inter-particle repulsion can be eliminated by means of a compensating control pulse, yielding, quite surprisingly, an enhancement of the transfer speed because of the particle interaction -- in contrast to the self-trapping scenario. Finally, we perform numerical optimisations of both the nonlinear and the (exact) many-body quantum dynamics in order to further enhance the transfer efficiency close to the quantum speed limit.

  3. Dynamic Operational Risk Assessment with Bayesian Network 

    E-Print Network [OSTI]

    Barua, Shubharthi

    2012-10-19

    dependencies of equipment/components and timing of safety system operations, all of which are time dependent criteria that can influence dynamic processes. The conventional risk assessment methodologies can quantify dynamic changes in processes with limited...

  4. Mathematics 658 Nonlinear Dynamics and Geometic Mechanics

    E-Print Network [OSTI]

    Bloch, Anthony

    Mathematics 658 Nonlinear Dynamics and Geometic Mechanics Instructor: Anthony M. Bloch. Office of ordinary differential equations and dynamical systems, with applications to various mechanical and physical geometry, nonlinear stability theory, Lagrangian and Hamiltonian mechanics, integrable systems, reduction

  5. Mapping molecular dynamics computations to hypercubes 

    E-Print Network [OSTI]

    Lakamsani, Vamsee Krishna

    1993-01-01

    This thesis proposes an approach for systematic modeling, mapping and performance analysis of a Grand Challenge application problem in computational biology called Molecular Dynamics Simulation of Proteins. Molecular Dynamics (MD) is an important...

  6. Lab experiences for teaching undergraduate dynamics

    E-Print Network [OSTI]

    Lilienkamp, Katherine A. (Katherine Ann), 1969-

    2003-01-01

    This thesis describes several projects developed to teach undergraduate dynamics and controls. The materials were developed primarily for the class 2.003 Modeling Dynamics and Control I. These include (1) a set of ActivLab ...

  7. Protein-directed dynamic combinatorial chemistry 

    E-Print Network [OSTI]

    Bhat, Venugopal T.

    2011-11-23

    Dynamic combinatorial chemistry (DCC) is a novel approach to medicinal chemistry which integrates the synthesis and screening of small molecule libraries into a single step. The concept uses reversible chemical reactions to present a dynamic library...

  8. Finding Bugs In Dynamic Web Applications

    E-Print Network [OSTI]

    Artzi, Shay

    2008-02-06

    Web script crashes and malformed dynamically-generated web pages are common errors, and they seriously impact usability of web applications. Currenttools for web-page validation cannot handle the dynamically-generatedpages ...

  9. Granular Dynamics in Pebble Bed Reactor Cores

    E-Print Network [OSTI]

    Laufer, Michael Robert

    2013-01-01

    a simulant fluid to match the dynamics of fuel pebbles andfuel pebbles through reactor cores with and without coupled fluid

  10. Dynamic Screening and Thermonuclear Reaction Rates

    E-Print Network [OSTI]

    Andrei V. Gruzinov

    1997-02-06

    We show that there are no dynamic screening corrections to the Salpeter's enhancement factor in the weak-screening limit.

  11. Insight Gained from Simplified Dynamic Analysis

    Broader source: Energy.gov [DOE]

    Insight Gained from Simplified Dynamic Analysis ... or Everything Old is New Again October 21, 2014 Greg Mertz Consultant

  12. Molecular dynamics simulation studies of electrolytes andelectrolyte...

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

    studies of electrolytes and electrolyteelectrode interfaces Molecular dynamics simulation studies of electrolytes and electrolyteelectrode interfaces 2009 DOE Hydrogen Program...

  13. Composition of Dynamic Analysis Aspects Eric Tanter

    E-Print Network [OSTI]

    Binder, Walter

    Composition of Dynamic Analysis Aspects ´Eric Tanter PLEIAD Laboratory Computer Science Department thanks to recent advances in exhaustive weaving in core libraries. Casting dynamic analyses as aspects, simultaneously. However, even if dynamic analysis as- pects are mutually independent, their mere presence

  14. An Infrastructure for Adaptive Dynamic Optimization

    E-Print Network [OSTI]

    Amarasinghe, Saman

    An Infrastructure for Adaptive Dynamic Optimization Derek Bruening, Timothy Garnett, and Saman,timothyg,saman}@lcs.mit.edu Abstract Dynamic optimization is emerging as a promising ap- proach to overcome many of the obstacles static optimizations, there are very few for developing dynamic optimizations. We present a framework

  15. September 2015 MSME in Dynamics and Vibration

    E-Print Network [OSTI]

    Feeny, Brian

    Arrival Spring Semester: 9cr ME 861 Advanced Dynamics 3 cr ME 814 Convective Heat Transfer (Breadth course and Research Topics Dynamics: Kinematics in two and three dimensions, Newton's equations of motion, energy body dynamics. (Mukherjee, Feeny) Vibration: Mathematical modeling of vibration systems using

  16. Computability and Dynamical Systems: a Perspective

    E-Print Network [OSTI]

    Graça, Daniel S.

    Computability and Dynamical Systems: a Perspective Daniel S. Gra¸ca SQIG - IT and DM In this paper we look at dynamical systems from a computability per- spective. We survey some topics and themes of research for dynamical systems and then see how they can be fitted in a computational frame- work. We

  17. Geometric control and dynamical systems Ludovic Rifford

    E-Print Network [OSTI]

    Rifford, Ludovic

    Geometric control and dynamical systems Ludovic Rifford Universit´e de Nice - Sophia Antipolis Equations and Applications Ludovic Rifford Geometric control and dynamical systems #12;Control of an inverted pendulum Ludovic Rifford Geometric control and dynamical systems #12;Control systems A general

  18. LANGUAGE LEARNING AND NONLINEAR DYNAMICAL SYSTEMS

    E-Print Network [OSTI]

    Andrews, Mark W.

    LANGUAGE LEARNING AND NONLINEAR DYNAMICAL SYSTEMS A Dissertation Presented to the Faculty LEARNING AND NONLINEAR DYNAMICAL SYSTEMS Mark William Andrews, Ph.D. Cornell University 2003 The thesis be provided by an better appreciation of the capacities of nonlinear dynamical systems to learn, rep- resent

  19. Resource Management for Dynamic Reconfigurable Hardware Structures

    E-Print Network [OSTI]

    Huss, Sorin A.

    Resource Management for Dynamic Reconfigurable Hardware Structures Andreas K¨uhn, Felix Madlener|madlener|huss}@iss.tu-darmstadt.de Abstract-- Garbage-Collection for reconfigurable hardware systems is another step to make dynamic reconfigurable hardware usable. By now, dynamic reconfiguration of FPGAs is still based on common hardware design

  20. Control algorithms for dynamic attenuators

    SciTech Connect (OSTI)

    Hsieh, Scott S., E-mail: sshsieh@stanford.edu [Department of Radiology, Stanford University, Stanford, California 94305 and Department of Electrical Engineering, Stanford University, Stanford, California 94305 (United States); Pelc, Norbert J. [Department of Radiology, Stanford University, Stanford California 94305 and Department of Bioengineering, Stanford University, Stanford, California 94305 (United States)] [Department of Radiology, Stanford University, Stanford California 94305 and Department of Bioengineering, Stanford University, Stanford, California 94305 (United States)

    2014-06-15

    Purpose: The authors describe algorithms to control dynamic attenuators in CT and compare their performance using simulated scans. Dynamic attenuators are prepatient beam shaping filters that modulate the distribution of x-ray fluence incident on the patient on a view-by-view basis. These attenuators can reduce dose while improving key image quality metrics such as peak or mean variance. In each view, the attenuator presents several degrees of freedom which may be individually adjusted. The total number of degrees of freedom across all views is very large, making many optimization techniques impractical. The authors develop a theory for optimally controlling these attenuators. Special attention is paid to a theoretically perfect attenuator which controls the fluence for each ray individually, but the authors also investigate and compare three other, practical attenuator designs which have been previously proposed: the piecewise-linear attenuator, the translating attenuator, and the double wedge attenuator. Methods: The authors pose and solve the optimization problems of minimizing the mean and peak variance subject to a fixed dose limit. For a perfect attenuator and mean variance minimization, this problem can be solved in simple, closed form. For other attenuator designs, the problem can be decomposed into separate problems for each view to greatly reduce the computational complexity. Peak variance minimization can be approximately solved using iterated, weighted mean variance (WMV) minimization. Also, the authors develop heuristics for the perfect and piecewise-linear attenuators which do not requirea priori knowledge of the patient anatomy. The authors compare these control algorithms on different types of dynamic attenuators using simulated raw data from forward projected DICOM files of a thorax and an abdomen. Results: The translating and double wedge attenuators reduce dose by an average of 30% relative to current techniques (bowtie filter with tube current modulation) without increasing peak variance. The 15-element piecewise-linear dynamic attenuator reduces dose by an average of 42%, and the perfect attenuator reduces dose by an average of 50%. Improvements in peak variance are several times larger than improvements in mean variance. Heuristic control eliminates the need for a prescan. For the piecewise-linear attenuator, the cost of heuristic control is an increase in dose of 9%. The proposed iterated WMV minimization produces results that are within a few percent of the true solution. Conclusions: Dynamic attenuators show potential for significant dose reduction. A wide class of dynamic attenuators can be accurately controlled using the described methods.

  1. Dynamic Logics of Dynamical Systems ANDR E PLATZER, Carnegie Mellon University

    E-Print Network [OSTI]

    Platzer, André

    . Dynamical systems are mathematical models describing how the state of a system evolves over time. They are important for modeling and understanding many applications, including embedded systems and cyber of differential equations. We explain the dynamical system models, dynamic logics of dynamical systems

  2. THE JOURNAL OF CHEMICAL PHYSICS 139, 175101 (2013) Dynamic neutron scattering from conformational dynamics. I. Theory

    E-Print Network [OSTI]

    2013-01-01

    #12;THE JOURNAL OF CHEMICAL PHYSICS 139, 175101 (2013) Dynamic neutron scattering from, a conformational dynamics theory of dynamical neutron and X-ray scattering is developed, follow- ing our previous spectroscopy (dynamic neutron scattering) probes time correlations on the sub pico- to microsec- ond timescales

  3. Dynamical Systems and Applications of Nonlinear Functional Analysis to Dynamical Systems

    E-Print Network [OSTI]

    Zhang, Meirong

    Dynamical Systems and Applications of Nonlinear Functional Analysis to Dynamical Systems Meirong consists of three parts. In Part 1 we introduce some basic concepts in dynamical systems, including limit sets, nonwandering sets, topological conjugacy, clas- sification of discrete dynamical systems under

  4. Dynamic imaging with electron microscopy

    ScienceCinema (OSTI)

    Campbell, Geoffrey; McKeown, Joe; Santala, Melissa

    2014-05-30

    Livermore researchers have perfected an electron microscope to study fast-evolving material processes and chemical reactions. By applying engineering, microscopy, and laser expertise to the decades-old technology of electron microscopy, the dynamic transmission electron microscope (DTEM) team has developed a technique that can capture images of phenomena that are both very small and very fast. DTEM uses a precisely timed laser pulse to achieve a short but intense electron beam for imaging. When synchronized with a dynamic event in the microscope's field of view, DTEM allows scientists to record and measure material changes in action. A new movie-mode capability, which earned a 2013 R&D 100 Award from R&D Magazine, uses up to nine laser pulses to sequentially capture fast, irreversible, even one-of-a-kind material changes at the nanometer scale. DTEM projects are advancing basic and applied materials research, including such areas as nanostructure growth, phase transformations, and chemical reactions.

  5. Predissociation dynamics of lithium iodide

    E-Print Network [OSTI]

    Schmidt, H; Stienkemeier, F; Bogomolov, A S; Baklanov, A V; Reich, D M; Skomorowski, W; Koch, C P; Mudrich, M

    2015-01-01

    The predissociation dynamics of lithium iodide (LiI) in the first excited A-state is investigated for molecules in the gas phase and embedded in helium nanodroplets, using femtosecond pump-probe photoionization spectroscopy. In the gas phase, the transient Li+ and LiI+ ion signals feature damped oscillations due to the excitation and decay of a vibrational wave packet. Based on high-level ab initio calculations of the electronic structure of LiI and simulations of the wave packet dynamics, the exponential signal decay is found to result from predissociation predominantly at the lowest avoided X-A potential curve crossing, for which we infer a coupling constant V=650(20) reciprocal cm. The lack of a pump-probe delay dependence for the case of LiI embedded in helium nanodroplets indicates fast droplet-induced relaxation of the vibrational excitation.

  6. Color Dynamics On Phase Space

    E-Print Network [OSTI]

    A. Bonasera

    2000-03-09

    We describe the properties of quark matter at zero temperature and finite baryon densities within microscopic Vlasov/molecular dynamics approaches. We use an inter-quark Richardson's potential consistent with the indications of Lattice QCD calculations. The color degrees of freedom are explicitly taken into account. We explicitly demonstrate that the Vlasov approach alone is insufficient in the hadronization region. In order to overcome this problem we prepare the initial condition for many events using molecular dynamics with frictional cooling and a Thomas-Fermi approximation to the Fermi motion. These events are averaged and propagated in time using the Vlasov approach. We find some evidence for a second order phase transition from nuclear to quark matter at high baryon densities. An order parameter suitable to describe the phase transition is discussed. At low densities the quark condensate into approximately color white clusters (nucleon).

  7. Learning Dynamics in Economic Games

    E-Print Network [OSTI]

    Spanknebel, Martin

    2015-01-01

    When playing games human decision behaviour is often found to be diverse. For instance, in repeated prisoner dilemma games humans exhibit broad distributions of cooperativity and on average do not optimize their mean payoff. Deviations from optimal behaviour have been attributed to auxiliary causes including randomness of decisions, mis-estimations of probabilities, accessory objectives, or emotional biases. Here we show that also the dynamics resulting from of a general tendency to shift preferences towards previously rewarding choices in interaction with the strategy of the opponent can contribute substantially to observed lacks of 'rationality'. As a representative example we investigate the dynamics of choice preferences in prisoner dilemma games with opponents exhibiting different degrees of extortion and generosity. We find that already a very simple model for human learning can account for a surprisingly wide range of human decision behaviours. In particular, the theory can reproduce reduced cooperatio...

  8. Dynamic load balancing of applications

    DOE Patents [OSTI]

    Wheat, S.R.

    1997-05-13

    An application-level method for dynamically maintaining global load balance on a parallel computer, particularly on massively parallel MIMD computers is disclosed. Global load balancing is achieved by overlapping neighborhoods of processors, where each neighborhood performs local load balancing. The method supports a large class of finite element and finite difference based applications and provides an automatic element management system to which applications are easily integrated. 13 figs.

  9. Gate complexity using Dynamic Programming

    E-Print Network [OSTI]

    Srinivas Sridharan; Mile Gu; Matthew R. James

    2008-07-03

    The relationship between efficient quantum gate synthesis and control theory has been a topic of interest in the quantum control literature. Motivated by this work, we describe in the present article how the dynamic programming technique from optimal control may be used for the optimal synthesis of quantum circuits. We demonstrate simulation results on an example system on SU(2), to obtain plots related to the gate complexity and sample paths for different logic gates.

  10. Exact Dynamical and Partial Symmetries

    E-Print Network [OSTI]

    A. Leviatan

    2010-12-15

    We discuss a hierarchy of broken symmetries with special emphasis on partial dynamical symmetries (PDS). The latter correspond to a situation in which a non-invariant Hamiltonian accommodates a subset of solvable eigenstates with good symmetry, while other eigenstates are mixed. We present an algorithm for constructing Hamiltonians with this property and demonstrate the relevance of the PDS notion to nuclear spectroscopy, to quantum phase transitions and to mixed systems with coexisting regularity and chaos.

  11. Dynamic load balancing of applications

    DOE Patents [OSTI]

    Wheat, Stephen R. (Albuquerque, NM)

    1997-01-01

    An application-level method for dynamically maintaining global load balance on a parallel computer, particularly on massively parallel MIMD computers. Global load balancing is achieved by overlapping neighborhoods of processors, where each neighborhood performs local load balancing. The method supports a large class of finite element and finite difference based applications and provides an automatic element management system to which applications are easily integrated.

  12. Dynamical 3-Space: Emergent Gravity

    E-Print Network [OSTI]

    Reginald T Cahill

    2011-02-16

    The laws of gravitation devised by Newton, and by Hilbert and Einstein, have failed many experimental and observational tests, namely the bore hole g anomaly, flat rotation curves for spiral galaxies, supermassive black hole mass spectrum, uniformly expanding universe, cosmic filaments, laboratory G measurements, galactic EM bending, precocious galaxy formation,.. The response has been the introduction of the new epicycles: ``dark matter", ``dark energy", and others. To understand gravity we must restart with the experimental discoveries by Galileo, and following a heuristic argument we are led to a uniquely determined theory of a dynamical 3-space. That 3-space exists has been missed from the beginning of physics, although it was 1st directly detected by Michelson and Morley in 1887. Uniquely generalising the quantum theory to include this dynamical 3-space we deduce the response of quantum matter and show that it results in a new account of gravity, and explains the above anomalies and others. The dynamical theory for this 3-space involves G, which determines the dissipation rate of space by matter, and alpha, which experiments and observation reveal to be the fine structure constant. For the 1st time we have a comprehensive account of space and matter and their interaction - gravity.

  13. Integrability in the mesoscopic dynamics

    E-Print Network [OSTI]

    Artur Sowa

    2004-09-12

    The Mesoscopic Mechanics (MeM), which has been introduced in a previous paper, is relevant to the electron gas confined to two spatial dimensions. It predicts a special way of collective response of correlated electrons to the external magnetic field. The dynamic variable of this theory is a finite-dimensional operator, which is required to satisfy the mesoscopic Schr\\"{o}dinger equation (cf. text). In this article, we describe general solutions of the mesoscopic Schr\\"{o}dinger equation. Our approach is specific to the problem at hand. It relies on the unique structure of the equation and makes no reference to any other techniques, with the exception of the geometry of unitary groups. In conclusion, a surprising fact comes to light. Namely, the mesoscopic dynamics "filters" through the (microscopic) Schr\\"odinger dynamics as the latter turns out to be a clearly separable part, in fact an autonomous factor, of the evolution. This is a desirable result also from the physical standpoint.

  14. Reputational Learning and Network Dynamics

    E-Print Network [OSTI]

    Zhang, Simpson

    2015-01-01

    In many real world networks agents are initially unsure of each other's qualities and learn about each other over time via repeated interactions. This paper is the first to provide a methodology for studying the formation of such networks, taking into account that agents differ from each other, that they begin with incomplete information, and that they must learn through observations which connections/links to form and which to break. The network dynamics in our model vary drastically from the dynamics emerging in models of complete information. With incomplete information and learning, agents who provide high benefits will develop high reputations and remain in the network, while agents who provide low benefits will drop in reputation and become ostracized. We show, among many other things, that the information to which agents have access and the speed at which they learn and act can have tremendous impact on the resulting network dynamics. Using our model, we can also compute the \\textit{ex ante} social wel...

  15. Simulation and sequential dynamical systems

    SciTech Connect (OSTI)

    Mortveit, H.S.; Reidys, C.M.

    1999-06-01

    Computer simulations have a generic structure. Motivated by this the authors present a new class of discrete dynamical systems that captures this structure in a mathematically precise way. This class of systems consists of (1) a loopfree graph {Upsilon} with vertex set {l_brace}1,2,{hor_ellipsis},n{r_brace} where each vertex has a binary state, (2) a vertex labeled set of functions (F{sub i,{Upsilon}}:F{sub 2}{sup n} {yields} F{sub 2}{sup n}){sub i} and (3) a permutation {pi} {element_of} S{sub n}. The function F{sub i,{Upsilon}} updates the state of vertex i as a function of the states of vertex i and its {Upsilon}-neighbors and leaves the states of all other vertices fixed. The permutation {pi} represents the update ordering, i.e., the order in which the functions F{sub i,{Upsilon}} are applied. By composing the functions F{sub i,{Upsilon}} in the order given by {pi} one obtains the dynamical system (equation given in paper), which the authors refer to as a sequential dynamical system, or SDS for short. The authors will present bounds for the number of functionally different systems and for the number of nonisomorphic digraphs {Gamma}[F{sub {Upsilon}},{pi}] that can be obtained by varying the update order and applications of these to specific graphs and graph classes.

  16. Earth materials and earth dynamics

    SciTech Connect (OSTI)

    Bennett, K; Shankland, T. [and others

    2000-11-01

    In the project ''Earth Materials and Earth Dynamics'' we linked fundamental and exploratory, experimental, theoretical, and computational research programs to shed light on the current and past states of the dynamic Earth. Our objective was to combine different geological, geochemical, geophysical, and materials science analyses with numerical techniques to illuminate active processes in the Earth. These processes include fluid-rock interactions that form and modify the lithosphere, non-linear wave attenuations in rocks that drive plate tectonics and perturb the earth's surface, dynamic recrystallization of olivine that deforms the upper mantle, development of texture in high-pressure olivine polymorphs that create anisotropic velocity regions in the convecting upper mantle and transition zone, and the intense chemical reactions between the mantle and core. We measured physical properties such as texture and nonlinear elasticity, equation of states at simultaneous pressures and temperatures, magnetic spins and bonding, chemical permeability, and thermal-chemical feedback to better characterize earth materials. We artificially generated seismic waves, numerically modeled fluid flow and transport in rock systems and modified polycrystal plasticity theory to interpret measured physical properties and integrate them into our understanding of the Earth. This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL).

  17. Brownian dynamics without Green's functions

    SciTech Connect (OSTI)

    Delong, Steven; Donev, Aleksandar; Usabiaga, Florencio Balboa; Delgado-Buscalioni, Rafael; Griffith, Boyce E.; Leon H. Charney Division of Cardiology, Department of Medicine, New York University School of Medicine, New York, New York 10016

    2014-04-07

    We develop a Fluctuating Immersed Boundary (FIB) method for performing Brownian dynamics simulations of confined particle suspensions. Unlike traditional methods which employ analytical Green's functions for Stokes flow in the confined geometry, the FIB method uses a fluctuating finite-volume Stokes solver to generate the action of the response functions “on the fly.” Importantly, we demonstrate that both the deterministic terms necessary to capture the hydrodynamic interactions among the suspended particles, as well as the stochastic terms necessary to generate the hydrodynamically correlated Brownian motion, can be generated by solving the steady Stokes equations numerically only once per time step. This is accomplished by including a stochastic contribution to the stress tensor in the fluid equations consistent with fluctuating hydrodynamics. We develop novel temporal integrators that account for the multiplicative nature of the noise in the equations of Brownian dynamics and the strong dependence of the mobility on the configuration for confined systems. Notably, we propose a random finite difference approach to approximating the stochastic drift proportional to the divergence of the configuration-dependent mobility matrix. Through comparisons with analytical and existing computational results, we numerically demonstrate the ability of the FIB method to accurately capture both the static (equilibrium) and dynamic properties of interacting particles in flow.

  18. Molecular dynamics simulation and ab intio studies of electrolytes...

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

    Molecular Dynamics Simulation Studies of Electrolytes and ElectrolyteElectrode Interfaces Molecular dynamics simulation studies of electrolytes and electrolyteelectrode...

  19. 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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield Municipal Gas &SCE-SessionsSouth DakotaRobbins and700, 1.Reports1 Rev.Metals CaseEVALUATION

  20. An Approximate Dynamic Programming Approach for Coordinated Charging Control At

    E-Print Network [OSTI]

    Wong, Vincent

    starts charging as soon as it is connected to the grid. I. INTRODUCTION Smart grid technologies can help. With the deployment of smart grid technologies, the control and schedule of V2G power flows (and thus bidirectional PHEV's compensation from frequency regulation against its charging cost. Sortomme et al. proposed smart

  1. Prof. Alessandro De Luca Dynamic model of robots

    E-Print Network [OSTI]

    De Luca, Alessandro

    III Robotics 2 5 #12;Robots with closed kinematic chains - 2 MIT Direct Drive Mark IV (planar five-bar linkage) UMinnesota Direct Drive Arm (spatial five-bar linkage) Robotics 2 6 #12;Robot with parallelogram of masses (including motors) ! mechanical compensation ! articulated system of springs ! closed kinematic

  2. Brownian Dynamics Simulation of Protein Solutions: Structural and Dynamical Properties

    SciTech Connect (OSTI)

    Mereghetti, Paolo; Gabdoulline, Razif; Wade, Rebecca C.

    2010-12-01

    The study of solutions of biomacromolecules provides an important basis for understanding the behavior of many fundamental cellular processes, such as protein folding, self-assembly, biochemical reactions, and signal transduction. Here, we describe a Brownian dynamics simulation procedure and its validation for the study of the dynamic and structural properties of protein solutions. In the model used, the proteins are treated as atomically detailed rigid bodies moving in a continuum solvent. The protein-protein interaction forces are described by the sum of electrostatic interaction, electrostatic desolvation, nonpolar desolvation, and soft-core repulsion terms. The linearized Poisson-Boltzmann equation is solved to compute electrostatic terms. Simulations of homogeneous solutions of three different proteins with varying concentrations, pH, and ionic strength were performed. The results were compared to experimental data and theoretical values in terms of long-time self-diffusion coefficients, second virial coefficients, and structure factors. The results agree with the experimental trends and, in many cases, experimental values are reproduced quantitatively. There are no parameters specific to certain protein types in the interaction model, and hence the model should be applicable to the simulation of the behavior of mixtures of macromolecules in cell-like crowded environments.

  3. Why quantum dynamics is linear

    E-Print Network [OSTI]

    Thomas F. Jordan

    2007-02-16

    Quantum dynamics is linear. How do we know? From theory or experiment? The history of this question is reviewed. Nonlinear generalizations of quantum mechanics have been proposed. They predict small but clear nonlinear effects, which very accurate experiments have not seen. Is there a reason in principle why nonlinearity is not found? Is it impossible? Does quantum dynamics have to be linear? Attempts to prove this have not been decisive, because either their assumptions are not compelling or their arguments are not conclusive. The question has been left unsettled. There is a simple answer, based on a simple assumption. It was found in two steps separated by 44 years. They are steps back to simpler and more compelling assumptions. A proof of the assumptions of the Wigner-Bargmann proof has been known since 1962. It assumes that the maps of density matrices in time are linear. For this step, it is also assumed that density matrices are mapped one-to-one onto density matrices. An alternative is to assume that pure states are mapped one-to-one onto pure states and that entropy does not decrease. In a step taken in 2006, it is proved that the maps of density matrices in time are linear. It is assumed, as in the earlier step, that at each time the physical quantities and states are described by the usual linear structures of quantum mechanics, so the question is only about how things change in time. Beyond that, the proof assumes only that the dynamics does not depend on anything outside the system, but must allow the system to be described as part of a larger system.

  4. A Relativistic Dynamical Collapse Model

    E-Print Network [OSTI]

    Philip Pearle

    2014-12-21

    A model is discussed where all operators are constructed from a quantum scalar field whose energy spectrum takes on all real values. The Schr\\"odinger picture wave function depends upon space and time coordinates for each particle, as well as an inexorably increasing evolution parameter $s$ which labels a foliation of space-like hypersurfaces. The model is constructed to be manifestly Lorentz invariant in the interaction picture. Free particle states and interactions are discussed in this framework. Then, the formalism of the CSL (Continuous Spontaneous Localization) theory of dynamical collapse is applied. The collapse-generating operator is chosen to to be the particle number space-time density. Unlike previous relativistically invariant models, the vacuum state is not excited. The collapse dynamics depends upon two parameters, a parameter $\\Lambda$ which represents the collapse rate/volume and a scale factor $\\ell$. A common example of collapse dynamics, involving a clump of matter in a superposition of two locations, is analyzed. The collapse rate is shown to be identical to that of non-relativistic CSL when the GRW-CSL choice of $\\ell=a=10^{-5}$cm, is made, along with $\\Lambda=\\lambda/a^{3}$ (GRW-CSL choice $\\lambda=10^{-16}s^{-1}$). However, it is also shown that the change of mass of a nucleon over the age of the universe is then unacceptably large. The case where $\\ell$ is the size of the universe is then considered. It is shown that the collapse behavior is satisfactory and the change of mass over the age of the universe is acceptably small, when $\\Lambda= \\lambda/\\ell a^{2}$.

  5. Lagrangian continuum dynamics in ALEGRA.

    SciTech Connect (OSTI)

    Wong, Michael K. W.; Love, Edward

    2007-12-01

    Alegra is an ALE (Arbitrary Lagrangian-Eulerian) multi-material finite element code that emphasizes large deformations and strong shock physics. The Lagrangian continuum dynamics package in Alegra uses a Galerkin finite element spatial discretization and an explicit central-difference stepping method in time. The goal of this report is to describe in detail the characteristics of this algorithm, including the conservation and stability properties. The details provided should help both researchers and analysts understand the underlying theory and numerical implementation of the Alegra continuum hydrodynamics algorithm.

  6. Viral BLIP dynamics during HAART.

    SciTech Connect (OSTI)

    Markowitz, M.; Louie, M. (Michael); Hurley, A. (Arlene); Ho, David D.; Perelson, Alan S.,; Di Mascio, M. (Michele)

    2001-01-01

    Intermittent episodes of low-level viremia (blips) are often observed in well-suppressed, HAART-treated patients. It has been reported that viral blips do not correlate with the emergence of new HAART-related mutations; however, increased frequency of blips correlates with slower decay of latently infected cells. Since blips are transient and unpredictable, detailed knowledge about them is difficult to obtain. We present an analysis of the dynamics of viral blips from viral load (VL) measurements on 123 patients for a period of 809k480d (21-1817d) and sampled every 31{+-}12d for a total of 26{+-}15 samples per patient.

  7. Simulations with dynamical HISQ quarks

    E-Print Network [OSTI]

    A. Bazavov; C. Bernard; C. DeTar; W. Freeman; Steven Gottlieb; U. M. Heller; J. E. Hetrick; J. Laiho; L. Levkova; M. Oktay; J. Osborn; R. L. Sugar; D. Toussaint; R. S. Van de Water

    2010-12-06

    We report on the status of a program of generating and using configurations with four flavors of dynamical quarks, using the HISQ action. We study the lattice spacing dependence of physical quantities in these simulations, using runs at several lattice spacings, but with the light quark mass held fixed at two tenths of the strange quark mass. We find that the lattice artifacts in the HISQ simulations are much smaller than those in the asqtad simulations at the same lattice spacings and quark masses. We also discuss methods for setting the scale, or assigning a lattice spacing to ensembles run at unphysical parameters.

  8. Los Alamos Dynamics Summer School

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformationJesse BergkampCenter (LMI-EFRC)LodgingSchool » Los Alamos Dynamics Summer

  9. Los Alamos Dynamics Summer School

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformationJesse BergkampCenter (LMI-EFRC)LodgingSchool » Los Alamos Dynamics

  10. Fluid Dynamics and Solid Mechanics

    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: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverse (Journal Article) |FinalIndustrial Technologies Industrial3 Fluid Dynamics

  11. Ultrafast studies of solution dynamics

    SciTech Connect (OSTI)

    Woodruff, W.H.; Dyer, R.B.; Callender, R.H.

    1997-10-01

    This is the final report of a one-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). Fast chemical dynamics generally must be initiated photochemically. This limits the applicability of modern laser methods for following the structural changes that occur during chemical and biological reactions to those systems that have an electronic chromophore that has a significant yield of photoproduct when excited. This project has developed a new and entirely general approach to ultrafast initiation of reactions in solution: laser-induced temperature jump (T-jump). The results open entire new fields of study of ultrafast molecular dynamics in solution. The authors have demonstrated the T-jump technique on time scales of 50 ps and longer, and have applied it to study of the fast events in protein folding. They find that a general lifetime of alpha-helix formation is ca 100 ns, and that tertiary folds (in apomyoglobin) form in ca 100 {mu}s.

  12. Dynamic Testing of Gasifier Refractory

    SciTech Connect (OSTI)

    Michael D. Mann; Devdutt Shukla; John P. Hurley

    2003-09-27

    The University of North Dakota (UND) Chemical Engineering Department in conjunction with the UND Energy & Environmental Research Center (EERC) have initiated a program to thoroughly examine the combined chemical (reaction and phase change) and physical (erosion) effects experienced by a variety of refractory materials during both normal operation and thermal cycling under slagging coal gasification conditions. The goal of this work is to devise a mechanism of refractory loss under these conditions. The controlled-atmospheric dynamic corrodent application furnace (CADCAF) is being utilized to simulate refractory/slag interactions under dynamic conditions that more realistically simulate the environment in a slagging coal gasifier than any of the static tests used previously by refractory manufacturers and researchers. Shakedown testing of the CADCAF is in progress. Samples of slag and refractory from the Tampa Electric Polk Power Station have been obtained for testing in the CADCAF. The slag has been dried and sieved to the size needed for our flowing slag corrosion tests. Testing is expected to begin in October.

  13. Dynamic Testing of Gasifier Refractory

    SciTech Connect (OSTI)

    Michael D. Mann; Devdutt Shukla; Xi Hong; John P. Hurley

    2004-09-27

    The University of North Dakota (UND) Chemical Engineering Department in conjunction with the UND Energy & Environmental Research Center (EERC) have initiated a program to thoroughly examine the combined chemical (reaction and phase change) and physical (erosion) effects experienced by a variety of refractory materials during both normal operation and thermal cycling under slagging coal gasification conditions. The goal of this work is to devise a mechanism of refractory loss under these conditions. The controlled-atmospheric dynamic corrodent application furnace (CADCAF) is being utilized to simulate refractory/slag interactions under dynamic conditions that more realistically simulate the environment in a slagging coal gasifier than any of the static tests used previously by refractory manufacturers and researchers. Shakedown testing of the CADCAF has been completed. Samples of slag and refractory from the Tampa Electric Polk Power Station have been obtained for testing in the CADCAF. The slag has been dried and sieved to the size needed for our flowing slag corrosion tests. Screening tests are in currently in progress. Detailed analysis of corrosion rates from the first tests is in progress.

  14. Dynamics of Electrostatic MEMS Actuators

    E-Print Network [OSTI]

    Yang, Yisong; Zhao, Le

    2012-01-01

    Electrostatic actuators are simple but important switching devices for MEMS applications. Due to the difficulties associated with the electrostatic nonlinearity, precise mathematical description is often hard to obtain for the dynamics of these actuators. Here we present two sharp theorems concerning the dynamics of an undamped electrostatic actuator with one-degree of freedom, subject to linear and nonlinear elastic forces, respectively. We prove that both situations are characterized by the onset of one-stagnation-point periodic response below a well-defined pull-in voltage and a finite-time touch-down or collapse of the actuator above this pull-in voltage. In the linear-force situation, the stagnation level, pull-in voltage, and pull-in coordinate of the movable electrode may all be determined explicitly, following the recent work of Leus and Elata based on numerics. Furthermore, in the nonlinear-force situation, the stagnation level, pull-in voltage, and pull-in coordinate may be described completely in t...

  15. Dynamical analysis of highly excited molecular spectra

    SciTech Connect (OSTI)

    Kellman, M.E. [Univ. of Oregon, Eugene (United States)

    1993-12-01

    The goal of this program is new methods for analysis of spectra and dynamics of highly excited vibrational states of molecules. In these systems, strong mode coupling and anharmonicity give rise to complicated classical dynamics, and make the simple normal modes analysis unsatisfactory. New methods of spectral analysis, pattern recognition, and assignment are sought using techniques of nonlinear dynamics including bifurcation theory, phase space classification, and quantization of phase space structures. The emphasis is chaotic systems and systems with many degrees of freedom.

  16. A Dynamical Systems Approach to Turbulence

    E-Print Network [OSTI]

    This talk will discuss a general software framework for the computation of periodic orbits of high-dimensional dynamical systems, that is based on a matrix-

  17. Los Alamos Dynamics Summer School Projects

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

    Dynamics Summer School Projects and Resources Contact Institute Director Charles Farrar (505) 663-5330 Email Professional Staff Assistant Jutta Kayser (505) 663-5649 Email...

  18. Quantitative Modeling of High Temperature Magnetization Dynamics

    SciTech Connect (OSTI)

    Zhang, Shufeng

    2009-03-01

    Final Technical Report Project title: Quantitative Modeling of High Temperature Magnetization Dynamics DOE/Office of Science Program Manager Contact: Dr. James Davenport

  19. A Dynamic Platform for Runtime Adaptation

    E-Print Network [OSTI]

    Pham, Hubert

    We present a middleware platform for assembling pervasive applications that demand fault-tolerance and adaptivity in distributed, dynamic environments. Unlike typical adaptive middleware approaches, in which sophisticated ...

  20. The Dynamics of Moonlighting in Pakistan

    E-Print Network [OSTI]

    Hyder, Asma; Ahmed, Ather Maqsood

    2011-01-01

    of Sciences and Technology, Pakistan January 2011 10945 LeDynamics of Moonlighting in Pakistan Asma Hyder and Ather18 March, 2010 Islamabad, Pakistan Institute of Development

  1. Dynamical ensembles equivalence in fluid mechanics

    E-Print Network [OSTI]

    Giovanni Gallavotti

    1996-05-09

    Dissipative Euler and Navier Stokes equations are discussed with the aim of proposing several experiments apt to test the equivalence of dynamical ensembles and the chaotic hypothesis.

  2. Chiral dynamics and peripheral transverse densities Granados...

    Office of Scientific and Technical Information (OSTI)

    dynamics and peripheral transverse densities Granados, Carlos G. Uppsala University (Sweden); Weiss, Christian JLAB, Newport News, VA (United States) 72 PHYSICS OF ELEMENTARY...

  3. Dynamics in Polymer | ornl.gov

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

    Neutron scattering characterizes dynamics in polymer family Agatha Bardoel - December 01, 2012 Interior of BASIS. Research Contact: Christine Gerstl Understanding the interplay...

  4. Materials Science in Radiation and Dynamics Extremes

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

    properties, in particular of single crystals, ceramics, and nuclear fuels; Measures static and dynamic mechanical properties of metals, ceramics, polymers and energetic...

  5. Communication: Quantum molecular dynamics simulation of liquid...

    Office of Scientific and Technical Information (OSTI)

    Communication: Quantum molecular dynamics simulation of liquid para-hydrogen by nuclear and electron wave packet approach Citation Details In-Document Search Title: Communication:...

  6. Generalized Partial Dynamical Symmetries in Nuclear Spectroscopy

    E-Print Network [OSTI]

    A. Leviatan

    2002-10-23

    Explicit forms of IBM Hamiltonians with a generalized partial dynamical O(6) symmetry are presented and compared with empirical data in $^{162}$Dy.

  7. Dynamically Responsive Infrared Window Coatings | Department...

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

    Window Coatings Dynamically Responsive Infrared Window Coatings 1 of 5 An oxygen plasma etcher is used to clean test substrates for window coatings. Image: Pacific Northwest...

  8. LASER PHOTOCHEMICAL REACTION DYNAMICS IN FORMALDEHYDE

    E-Print Network [OSTI]

    Zughul, Muhammad B.

    2011-01-01

    Results . . . . . A. Formaldehyde H co (354.7 nm) . • H co +Photopredissociation in Formaldehyde A. Spectroscopy . . . .REACTION DYNAMICS IN FORMALDEHYDE Muhammad Bari Ahmad Zughul

  9. Dissolution Dynamic Nuclear Polarization of Polypeptides 

    E-Print Network [OSTI]

    Ragavan, Mukundan

    2014-06-27

    Nuclear Magnetic Resonance (NMR) spectroscopy provides remarkable site resolution, but often requires signal averaging because of low sensitivity. Dissolution dynamic nuclear polarization (DNP), which offers large signal ...

  10. On the Dynamic Stability of Electricity Markets

    E-Print Network [OSTI]

    2011-02-09

    been used to analyze the effect of dynamic disturbances such as wind on prices under ...... The operation of large steam turbines to limit cyclic thermal cracking.

  11. Dynamic Portfolio Optimization with Transaction Costs: Heuristics ...

    E-Print Network [OSTI]

    2011-02-03

    Aug 10, 2010 ... Dynamic Portfolio Optimization with Transaction. Costs: Heuristics and Dual Bounds. David B. Brown and James E. Smith?. Fuqua School of ...

  12. Dissipative Particle Dynamics with Energy Conservation: Dynamic and Transport Properties

    E-Print Network [OSTI]

    Josep Bonet Avalos; Allan D. Mackie

    2000-02-16

    Simulation results of the thermal conductivity ${\\cal L}$ of Dissipative Particle Dynamics model with Energy Conservation (DPDE) are reported. We also present an analysis of the transport equations and the transport coefficients for DPDE based on a local equilibrium approximation. This approach is valid when the particle-particle thermal conductivity $\\lambda$ and the friction coefficient $\\zeta$ are large. A qualitative derivation of the scaling form of the kinetic contribution of the transport of energy is derived, yielding two different forms for the kinetic contribution to the heat transport, depending on the value of $\\lambda$. We find agreement between the theoretically predicted value for ${\\cal L}$ and the simulation results, for large $\\lambda$ and many particles interacting at one time. Significant differences are found for small number of interacting particles, even with large $\\lambda$. For smaller values of $\\lambda$, the obtained macroscopic thermal conductivity is dominated by diffusive transport, in agreement with the proposed scaling form.

  13. Dynamically orthogonal field equations for stochastic fluid flows and particle dynamics

    E-Print Network [OSTI]

    Sapsis, Themistoklis P

    2011-01-01

    In the past decades an increasing number of problems in continuum theory have been treated using stochastic dynamical theories. This is because dynamical systems governing real processes always contain some elements ...

  14. BEAM DYNAMICS IN NS-FFAG EMMAWITH DYNAMICAL MAPS

    E-Print Network [OSTI]

    Giboudot, Y; Edgecock, R; Wolski, A

    2010-01-01

    The Non Scal­ing Fixed Field Al­ter­nat­ing Gra­di­ent EMMA has a com­pact lin­ear lat­tice. Ef­fect of Fringe Field on the beam has to be stud­ied care­ful­ly. A nu­mer­i­cal mag­net­ic field map is gen­er­at­ed by mag­net mea­sure­ments or mag­net de­sign soft­wares. We de­vel­oped a tech­nique that pro­duces from the nu­mer­i­cal field map, a dy­nam­i­cal map for a par­ti­cle trav­el­ling in the en­tire EMMA cell for a ref­er­ence en­er­gy with­out ac­cel­er­a­tion. Since the beam dy­nam­ics change with en­er­gy, a set of maps have been pro­duce with dif­fer­ent ref­er­ence en­er­gies be­tween 10 and 20MeV. For each ref­er­ence en­er­gy, sim­u­lat­ed tune and time of flight (TOF) have been com­pared with re­sults in Zgoubi - track­ing di­rect­ly through nu­mer­i­cal field map. The range of va­lid­i­ty of a sin­gle map has been in­ves­ti­gat­ed by track­ing par­ti­cle with large en­er­gy de­vi­a­tion. From that, a ...

  15. ME 413 Systems Dynamics & Control Chapter 1: Introduction to System Dynamics CChhaapptteerr 11

    E-Print Network [OSTI]

    Al-Qahtani, Hussain M.

    heat) when excited by temperature or heat flow. A heating system warming a house has a dynamic response

  16. Dynamic System Response of Truss Panels under High Dynamic Loading through Experimental & Computation Evaluation

    E-Print Network [OSTI]

    Wadley, Haydn

    to investigate the dynamic performance of truss panel systems. Two configurations were computer simulated to correlate experimental system failure limits under dynamic load. The computer code matched the experimental was the only trusted metric of dynamic performance of system. Computer codes were too inaccurate

  17. Phenol-benzene complexation dynamics: Quantum chemistry calculation, molecular dynamics simulations, and two dimensional IR spectroscopy

    E-Print Network [OSTI]

    Fayer, Michael D.

    Phenol-benzene complexation dynamics: Quantum chemistry calculation, molecular dynamics simulations the nature and dynamics of the phenol-benzene complex in the mixed solvent, benzene/CCl4. Under thermal used for the phenol-benzene interaction in the MD simulations is in good accord with the highest level

  18. 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 t The orientation dependent plasticity in metal nanowires is investigated using molecular dynamics and dislocation wires controls the mechanisms of plastic deformation. For wires oriented along /1 1 0S, dislocations

  19. Approximate Dynamic Programming for Dynamic Capacity Allocation with Multiple Priority Levels

    E-Print Network [OSTI]

    Topaloglu, Huseyin

    Approximate Dynamic Programming for Dynamic Capacity Allocation with Multiple Priority Levels In this paper, we consider a quite general dynamic capacity allocation problem. There is a fixed amount of daily to construct separable approximations to the value functions. We use the value function approximations for two

  20. FOCUS ISSUE: Nonlinear dynamics related to polymeric systems Overview: Nonlinear dynamics related to polymeric systems

    E-Print Network [OSTI]

    Epstein, Irving R.

    FOCUS ISSUE: Nonlinear dynamics related to polymeric systems Overview: Nonlinear dynamics related is another promising practical application of nonlinear chemical dynamics. In this issue we focus on non is known about nonlinear phenom- ena in polymeric systems. One reason for the lack of interest in nonlinear

  1. STATIC SECTORIZATION APPROACH TO DYNAMIC AIRSPACE CONFIGURATION USING APPROXIMATE DYNAMIC PROGRAMMING

    E-Print Network [OSTI]

    1 STATIC SECTORIZATION APPROACH TO DYNAMIC AIRSPACE CONFIGURATION USING APPROXIMATE DYNAMIC to Dynamic Airspace Configuration (DAC) by static sectorization. The objective of this paper is to address the issue of static sectorization by partitioning airspace based on controller workload i.e. airspace

  2. Sensitivity Analysis of a Dynamic Fleet Management Model Using Approximate Dynamic Programming

    E-Print Network [OSTI]

    Topaloglu, Huseyin

    of fleet management models is to make the vehicle repositioning and vehicle-to-load assignment decisions soSensitivity Analysis of a Dynamic Fleet Management Model Using Approximate Dynamic Programming present tractable algorithms to assess the sensitivity of a stochastic dynamic fleet management model

  3. Dynamic Positioning System as Dynamic Energy Storage on Diesel-Electric Ships

    E-Print Network [OSTI]

    Johansen, Tor Arne

    1 Dynamic Positioning System as Dynamic Energy Storage on Diesel-Electric Ships Tor A. Johansen in order to implement energy storage in the kinetic and potential energy of the ship motion using the DP in order to relate the dynamic energy storage capacity to the maximum allowed ship position deviation

  4. Transport in Transitory Dynamical Systems

    E-Print Network [OSTI]

    B. A. Mosovsky; J. D. Meiss

    2010-08-10

    We introduce the concept of a "transitory" dynamical system---one whose time-dependence is confined to a compact interval---and show how to quantify transport between two-dimensional Lagrangian coherent structures for the Hamiltonian case. This requires knowing only the "action" of relevant heteroclinic orbits at the intersection of invariant manifolds of "forward" and "backward" hyperbolic orbits. These manifolds can be easily computed by leveraging the autonomous nature of the vector fields on either side of the time-dependent transition. As illustrative examples we consider a two-dimensional fluid flow in a rotating double-gyre configuration and a simple one-and-a-half degree of freedom model of a resonant particle accelerator. We compare our results to those obtained using finite-time Lyapunov exponents and to adiabatic theory, discussing the benefits and limitations of each method.

  5. Dynamical Friction on extended perturbers

    E-Print Network [OSTI]

    O. Esquivel; B. Fuchs

    2008-04-01

    Following a wave-mechanical treatment we calculate the drag force exerted by an infinite homogeneous background of stars on a perturber as this makes its way through the system. We recover Chandrasekhar's classical dynamical friction (DF) law with a modified Coulomb logarithm. We take into account a range of models that encompasses all plausible density distributions for satellite galaxies by considering the DF exerted on a Plummer sphere and a perturber having a Hernquist profile. It is shown that the shape of the perturber affects only the exact form of the Coulomb logarithm. The latter converges on small scales, because encounters of the test and field stars with impact parameters less than the size of the massive perturber become inefficient. We confirm this way earlier results based on the impulse approximation of small angle scatterings.

  6. Dynamical Friction on extended perturbers

    E-Print Network [OSTI]

    Esquivel, O

    2008-01-01

    Following a wave-mechanical treatment we calculate the drag force exerted by an infinite homogeneous background of stars on a perturber as this makes its way through the system. We recover Chandrasekhar's classical dynamical friction (DF) law with a modified Coulomb logarithm. We take into account a range of models that encompasses all plausible density distributions for satellite galaxies by considering the DF exerted on a Plummer sphere and a perturber having a Hernquist profile. It is shown that the shape of the perturber affects only the exact form of the Coulomb logarithm. The latter converges on small scales, because encounters of the test and field stars with impact parameters less than the size of the massive perturber become inefficient. We confirm this way earlier results based on the impulse approximation of small angle scatterings.

  7. Chaotic Dynamics of Forest Fires

    E-Print Network [OSTI]

    K. Malarz; S. Kaczanowska; K. Kulakowski

    2002-04-25

    In the thermodynamic limit, a probabilistic cellular automaton can be approximated by a deterministic nonlinear map. Here we construct such a map for the forest fire problem. The construction is based on the results of the Monte Carlo simulation, performed on a square lattice of million cells. The results of the calculation are analyzed by means of the Hoshen--Kopelman algorithm (HKA). The only parameter of the map describes the probability that a tree appears at an empty cell during one time step. The obtained map seems to be non-differentiable at the percolation threshold. The Lyapunov exponent for the map is positive. Also, we found the cycle of length three by means of the method of symbolic dynamics. The results are illustrated by the experimental data on the forest fires in Canada in years 1970--2000. Although these data are fortunately far from thermodynamic limit, their qualitative character is reproduced for smaller lattices.

  8. Dynamics of assembly production flow

    E-Print Network [OSTI]

    Ezaki, Takahiro; Nishinari, Katsuhiro

    2015-01-01

    Despite recent developments in management theory, maintaining a manufacturing schedule remains difficult because of production delays and fluctuations in demand and supply of materials. The response of manufacturing systems to such disruptions to dynamic behavior has been rarely studied. To capture these responses, we investigate a process that models the assembly of parts into end products. The complete assembly process is represented by a directed tree, where the smallest parts are injected at leaves and the end products are removed at the root. A discrete assembly process, represented by a node on the network, integrates parts, which are then sent to the next downstream node as a single part. The model exhibits some intriguing phenomena, including overstock cascade, phase transition in terms of demand and supply fluctuations, nonmonotonic distribution of stockout in the network, and the formation of a stockout path and stockout chains. Surprisingly, these rich phenomena result from only the nature of distr...

  9. Thermal Dynamics in General Relativity

    E-Print Network [OSTI]

    C. S. Lopez-Monsalvo; N. Andersson

    2010-06-15

    We discuss a relativistic model for heat conduction, building on a convective variational approach to multi-fluid systems where the entropy is treated as a distinct dynamical entity. We demonstrate how this approach leads to a relativistic version of the Cattaneo equation, encoding the finite thermal relaxation time that is required to satisfy causality. We also show that the model naturally includes the non-equilibrium Gibbs relation that is a key ingredient in most approaches to extended thermodynamics. Focussing on the pure heat conduction problem, we compare the variational results to the second-order model developed by Israel and Stewart. The comparison shows that, despite the very different philosophies behind the two approaches, the two models are equivalent at first order deviations from thermal equilibrium. Finally, we complete the picture by working out the non-relativistic limit of our results, making contact with recent work in that regime.

  10. Black Holes and Nuclear Dynamics

    E-Print Network [OSTI]

    David Merritt

    2006-02-17

    Supermassive black holes inhabit galactic nuclei, and their presence influences in crucial ways the evolution of the stellar distribution. The low-density cores observed in bright galaxies are probably a result of black hole infall, while steep density cusps like those at the Galactic center are a result of energy exchange between stars moving in the gravitational field of the single black hole. Loss-cone dynamics are substantially more complex in galactic nuclei than in collisionally-relaxed systems like globular clusters due to the wider variety of possible geometries and orbital populations. The rate of star-black hole interactions has begun to be constrained through observations of energetic events associated with stellar tidal disruptions.

  11. Dynamical modeling of tidal streams

    SciTech Connect (OSTI)

    Bovy, Jo, E-mail: bovy@ias.edu [Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540 (United States)

    2014-11-01

    I present a new framework for modeling the dynamics of tidal streams. The framework consists of simple models for the initial action-angle distribution of tidal debris, which can be straightforwardly evolved forward in time. Taking advantage of the essentially one-dimensional nature of tidal streams, the transformation to position-velocity coordinates can be linearized and interpolated near a small number of points along the stream, thus allowing for efficient computations of a stream's properties in observable quantities. I illustrate how to calculate the stream's average location (its 'track') in different coordinate systems, how to quickly estimate the dispersion around its track, and how to draw mock stream data. As a generative model, this framework allows one to compute the full probability distribution function and marginalize over or condition it on certain phase-space dimensions as well as convolve it with observational uncertainties. This will be instrumental in proper data analysis of stream data. In addition to providing a computationally efficient practical tool for modeling the dynamics of tidal streams, the action-angle nature of the framework helps elucidate how the observed width of the stream relates to the velocity dispersion or mass of the progenitor, and how the progenitors of 'orphan' streams could be located. The practical usefulness of the proposed framework crucially depends on the ability to calculate action-angle variables for any orbit in any gravitational potential. A novel method for calculating actions, frequencies, and angles in any static potential using a single orbit integration is described in the Appendix.

  12. Charge Compensation in RE3+ (RE = Eu, Gd) and M+ (M = Li, Na, K) Co-Doped Alkaline Earth Nanofluorides Obtained by Microwave Reaction with Reactive Ionic Liquids Leading to Improved Optical Properties

    SciTech Connect (OSTI)

    Lorbeer, C [Ruhr-Universitat Bochum; Behrends, F [Westfalische Wilhelsm-Universitat Munster; Cybinska, J [Ruhr Universitat Bochum; Eckert, H [Westfalische Wilhelsm-Universitat Munster; Mudring, Anja -V [Ames Laboratory

    2014-01-01

    Alkaline earth fluorides are extraordinarily promising host matrices for phosphor materials with regard to rare earth doping. In particular, quantum cutting materials, which might considerably enhance the efficiency of mercury-free fluorescent lamps or SC solar cells, are often based on rare earth containing crystalline fluorides such as NaGdF4, GdF3 or LaF3. Substituting most of the precious rare earth ions and simultaneously retaining the efficiency of the phosphor is a major goal. Alkaline earth fluoride nanoparticles doped with trivalent lanthanide ions (which are required for the quantum cutting phenomenon) were prepared via a microwave assisted method in ionic liquids. As doping trivalent ions into a host with divalent cations requires charge compensation, this effect was thoroughly studied by powder X-ray and electron diffraction, luminescence spectroscopy and 23Na, 139La and 19F solid state NMR spectroscopy. Monovalent alkali ions were codoped with the trivalent lanthanide ions to relieve stress and achieve a better crystallinity and higher quantum cutting abilities of the prepared material. 19F-magic angle spinning (MAS)-NMR-spectra, assisted by 19F{23Na} rotational echo double resonance (REDOR) studies, reveal distinct local fluoride environments, the populations of which are discussed in relation to spatial distribution and clustering models. In the co-doped samples, fluoride species having both Na+ and La3+ ions within their coordination sphere can be identified and quantified. This interplay of mono- and trivalent ions in the CaF2 lattice appears to be an efficient charge compensation mechanism that allows for improved performance characteristics of such co-doped phosphor materials.

  13. Curving Dynamics in High Speed PUBLIC VERSION

    E-Print Network [OSTI]

    Curving Dynamics in High Speed Trains PUBLIC VERSION Daniele Bigoni Kongens Lyngby 2011 IMM forces on the dynamics, due to the high speed spinning of the wheel sets, has been highlighted. The wheel-rail interaction is modeled using the Hertz's static contact theory, corrected with the Kalker

  14. DYNAMIC RISK MANAGEMENT IN ELECTRICITY PORTFOLIO OPTIMIZATION

    E-Print Network [OSTI]

    Römisch, Werner

    DYNAMIC RISK MANAGEMENT IN ELECTRICITY PORTFOLIO OPTIMIZATION VIA POLYHEDRAL RISK FUNCTIONALS the dynamic decision structure appropriately. In energy risk management, which is typically carried out ex, for integrating risk management into a stochastic optimization framework, risk has to be quantified in a definite

  15. Idealized Test Cases for Dynamical Core Experiments

    E-Print Network [OSTI]

    Jablonowski, Christiane

    Idealized Test Cases for Dynamical Core Experiments Christiane Jablonowski (University of Michigan-13/2006 #12;Motivation · Test cases for 3D dynamical cores on the sphere ­ are hard to find in the literature groups ­ lack standardized & easy-to-use analysis techniques · Idea: Establish a collection of test cases

  16. Planar Multicontact Locomotion Using Hybrid Zero Dynamics 

    E-Print Network [OSTI]

    Lack, Jordan Thomas

    2013-11-26

    the dynamics during the impacts are modeled assuming perfectly plastic impacts in which the ground imparts an impulsive force on the impacting link. Using the dynamic model of the planar bipedal robot Amber 2, a seven link biped, a human-inspired optimization...

  17. Research Group: Finance "Dynamic risk management

    E-Print Network [OSTI]

    its operating cash ow exposure, due to the convexity in its cost of capital. When leverage exceeds 12-330 Research Group: Finance April 2012 "Dynamic risk management: investment, capital-Olivier Léautier #12;Dynamic risk management: investment, capital structure, and hedging in the presence

  18. Engineering mesoscale structures with distinct dynamical implications

    E-Print Network [OSTI]

    Engineering mesoscale structures with distinct dynamical implications Anne-Ly Do1 , Johannes H that there are certain mesoscale subgraphs that have precise and distinct consequences for the system-level dynamics. In particular, if mesoscale symmetries are present then eigenvectors of the Jacobian localise on the symmetric

  19. Modelling and Dynamic Simulation for Process Control

    E-Print Network [OSTI]

    Skogestad, Sigurd

    principles for model development are outlined, and these principles are applied to a simple ash tank (which. In this paper we consider dynamic process models obtained using fundamental principles (eg. based reactor, a simple trend analysis using temperature measurements may be suÆcient. Dynamic models

  20. Dynamics of Clouds Fall Semester 2012

    E-Print Network [OSTI]

    Collett Jr., Jeffrey L.

    -2pm Course Description: This class focuses on the general dynamics of cloud systems. Models of fog, vertical velocities, and liquid water contents 1 1 Fogs and Stratocumulus Clouds · Types of fog and formation mechanisms · Radiation fog and physics and dynamics · Valley fog · Marine fog · Stratocumulus