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Sample records for fixed point action

  1. Isostables, isochrons, and Koopman spectrum for the action-angle representation of stable fixed point dynamics

    NASA Astrophysics Data System (ADS)

    Mauroy, A.; Mezi?, I.; Moehlis, J.

    2013-10-01

    For asymptotically periodic systems, a powerful (phase) reduction of the dynamics is obtained by computing the so-called isochrons, i.e. the sets of points that converge toward the same trajectory on the limit cycle. Motivated by the analysis of excitable systems, a similar reduction has been attempted for non-periodic systems admitting a stable fixed point. In this case, the isochrons can still be defined but they do not capture the asymptotic behavior of the trajectories. Instead, the sets of interest-that we call “isostables”-are defined in the literature as the sets of points that converge toward the same trajectory on a stable slow manifold of the fixed point. However, it turns out that this definition of the isostables holds only for systems with slow-fast dynamics. Also, efficient methods for computing the isostables are missing. The present paper provides a general framework for the definition and the computation of the isostables of stable fixed points, which is based on the spectral properties of the so-called Koopman operator. More precisely, the isostables are defined as the level sets of a particular eigenfunction of the Koopman operator. Through this approach, the isostables are unique and well-defined objects related to the asymptotic properties of the system. Also, the framework reveals that the isostables and the isochrons are two different but complementary notions which define a set of action-angle coordinates for the dynamics. In addition, an efficient algorithm for computing the isostables is obtained, which relies on the evaluation of Laplace averages along the trajectories. The method is illustrated with the excitable FitzHugh-Nagumo model and with the Lorenz model. Finally, we discuss how these methods based on the Koopman operator framework relate to the global linearization of the system and to the derivation of special Lyapunov functions.

  2. Gravitational fixed points from perturbation theory.

    PubMed

    Niedermaier, Max R

    2009-09-01

    The fixed point structure of the renormalization flow in higher derivative gravity is investigated in terms of the background covariant effective action using an operator cutoff that keeps track of powerlike divergences. Spectral positivity of the gauge fixed Hessian can be satisfied upon expansion in the asymptotically free higher derivative coupling. At one-loop order in this coupling strictly positive fixed points are found for the dimensionless Newton constant g(N) and the cosmological constant lambda, which are determined solely by the coefficients of the powerlike divergences. The renormalization flow is asymptotically safe with respect to this fixed point and settles on a lambda(g(N)) trajectory after O(10) units of the renormalization mass scale to accuracy 10(-7). PMID:19792294

  3. Flat Coalgebraic Fixed Point Logics

    NASA Astrophysics Data System (ADS)

    Schröder, Lutz; Venema, Yde

    Fixed point logics are widely used in computer science, in particular in artificial intelligence and concurrency. The most expressive logics of this type are the ?-calculus and its relatives. However, popular fixed point logics tend to trade expressivity for simplicity and readability, and in fact often live within the single variable fragment of the ?-calculus. The family of such flat fixed point logics includes, e.g., CTL, the *-nesting-free fragment of PDL, and the logic of common knowledge. Here, we extend this notion to the generic semantic framework of coalgebraic logic, thus covering a wide range of logics beyond the standard ?-calculus including, e.g., flat fragments of the graded ?-calculus and the alternating-time ?-calculus (such as ATL), as well as probabilistic and monotone fixed point logics. Our main results are completeness of the Kozen-Park axiomatization and a timed-out tableaux method that matches ExpTime upper bounds inherited from the coalgebraic ?-calculus but avoids using automata.

  4. Multiple Fixed-Point Cell

    NASA Astrophysics Data System (ADS)

    Edler, F.; Ederer, P.

    2014-07-01

    The paper describes the construction and investigation of multiple fixed-point cells usable for the calibration of thermocouples at temperatures above 1100 C. These fixed-point cells made of pure graphite are characterized by a simple construction as well as by a flexible application. The cylindrical basic mount is equipped with a central hole for the insertion of a thermocouple, and with eight drill holes containing exchangeable cartridges which surround the central bore axially symmetrically. The cartridges are filled with different metal-carbon (Me-C) eutectics: cobalt-carbon (Co-C), nickel-carbon (Ni-C), palladium-carbon (Pd-C), and rhodium-carbon (Rh-C). The melting temperatures of the different Me-C eutectics of the cartridges were compared to the melting temperatures of commonly used Me-C eutectic fixed-point cells of the Physikalisch-Technische Bundesanstalt by using a Pt/Pd thermocouple (Co-C, Ni-C) and Type B thermocouples (Pd-C, Rh-C). The uncertainties () of the emfs measured at the inflection points of the melting curves are in the order of a few V which correspond to temperature equivalents between 0.3 K and 0.6 K. Furthermore, the difference between the melting temperatures of the Co-C and Ni-C cartridges was found to be 4.2 K by using simultaneously two sets of four cartridges filled with the two materials and placed alternately in the eight outer holes of one basic mount.

  5. BROUWER'S FIXED POINT THEOREM JASPER DEANTONIO

    E-print Network

    May, J. Peter

    BROUWER'S FIXED POINT THEOREM JASPER DEANTONIO Abstract. In this paper we prove Brouwer's Fixed be used to make three sequences which all have p as their limit point. Date: July 27, 2009. 1 #12;2 JASPER

  6. Quantum entanglement and fixed-point bifurcations

    E-print Network

    Andrew P. Hines; G. J. Milburn; Ross H. McKenzie

    2005-02-28

    How does the classical phase space structure for a composite system relate to the entanglement characteristics of the corresponding quantum system? We demonstrate how the entanglement in nonlinear bipartite systems can be associated with a fixed point bifurcation in the classical dynamics. Using the example of coupled giant spins we show that when a fixed point undergoes a supercritical pitchfork bifurcation, the corresponding quantum state - the ground state - achieves its maximum amount of entanglement near the critical point. We conjecture that this will be a generic feature of systems whose classical limit exhibits such a bifurcation.

  7. The 290 fixed-point sublattices of the Leech lattice

    E-print Network

    Gerald Hoehn; Geoffrey Mason

    2015-06-09

    We determine the orbits of fixed-point sublattices of the Leech lattice with respect to the action of the Conway group Co_0. There are 290 such orbits. Detailed information about these lattices, the corresponding coinvariant lattices, and the stabilizing subgroups, is tabulated in several tables.

  8. Quantum entanglement and fixed-point bifurcations

    E-print Network

    Hines, A P; McKenzie, R H; Hines, Andrew P.; Kenzie, Ross H. Mc

    2003-01-01

    How do the classical dynamics of a composite system relate to the entanglement characteristics of the corresponding quantum system? We show that entanglement in nonlinear bipartite systems can be associated with a fixed point bifurcation in the classical description. In a non dissipative system a fixed point corresponds to a quantum stationary state, usually a ground state. Using the example of coupled giant spins we show that, when the fixed point undergoes a supercritical pitchfork bifurcation, the corresponding quantum state achieves a maximum amount of entanglement. By way of contrast, we consider a molecular BEC system that experiences a different kind of bifurcation and does not exhibit the a peak in the entanglement corresponding to the bifurcation parameter.

  9. ASIC For Complex Fixed-Point Arithmetic

    NASA Technical Reports Server (NTRS)

    Petilli, Stephen G.; Grimm, Michael J.; Olson, Erlend M.

    1995-01-01

    Application-specific integrated circuit (ASIC) performs 24-bit, fixed-point arithmetic operations on arrays of complex-valued input data. High-performance, wide-band arithmetic logic unit (ALU) designed for use in computing fast Fourier transforms (FFTs) and for performing ditigal filtering functions. Other applications include general computations involved in analysis of spectra and digital signal processing.

  10. Fuzzy and Crisp Mahalanobis Fixed Point Clusters

    E-print Network

    Hennig, Christian

    Fuzzy and Crisp Mahalanobis Fixed Point Clusters Christian Hennig 1 Fachbereich Mathematik ­ SPST of the Mahalanobis distance. Crisp FPCs (where outlyingness is defined with a 0­1 weight function) are compared to fuzzy FPCs where outliers are smoothly downweighted. An algorithm to find substantial crisp and fuzzy

  11. Intuitionistic fixed point theories over Heyting arithmetic

    E-print Network

    Arai, Toshiyasu

    2010-01-01

    In this paper we show that an intuitionistic theory for fixed points is conservative over the Heyting arithmetic with respect to a certain class of formulas. This extends partly the result of mine. The proof is inspired by the quick cut-elimination due to G. Mints.

  12. Precise Point Positioning with Partial Ambiguity Fixing

    PubMed Central

    Li, Pan; Zhang, Xiaohong

    2015-01-01

    Reliable and rapid ambiguity resolution (AR) is the key to fast precise point positioning (PPP). We propose a modified partial ambiguity resolution (PAR) method, in which an elevation and standard deviation criterion are first used to remove the low-precision ambiguity estimates for AR. Subsequently the success rate and ratio-test are simultaneously used in an iterative process to increase the possibility of finding a subset of decorrelated ambiguities which can be fixed with high confidence. One can apply the proposed PAR method to try to achieve an ambiguity-fixed solution when full ambiguity resolution (FAR) fails. We validate this method using data from 450 stations during DOY 021 to 027, 2012. Results demonstrate the proposed PAR method can significantly shorten the time to first fix (TTFF) and increase the fixing rate. Compared with FAR, the average TTFF for PAR is reduced by 14.9% for static PPP and 15.1% for kinematic PPP. Besides, using the PAR method, the average fixing rate can be increased from 83.5% to 98.2% for static PPP, from 80.1% to 95.2% for kinematic PPP respectively. Kinematic PPP accuracy with PAR can also be significantly improved, compared to that with FAR, due to a higher fixing rate. PMID:26067196

  13. Precise Point Positioning with Partial Ambiguity Fixing.

    PubMed

    Li, Pan; Zhang, Xiaohong

    2015-01-01

    Reliable and rapid ambiguity resolution (AR) is the key to fast precise point positioning (PPP). We propose a modified partial ambiguity resolution (PAR) method, in which an elevation and standard deviation criterion are first used to remove the low-precision ambiguity estimates for AR. Subsequently the success rate and ratio-test are simultaneously used in an iterative process to increase the possibility of finding a subset of decorrelated ambiguities which can be fixed with high confidence. One can apply the proposed PAR method to try to achieve an ambiguity-fixed solution when full ambiguity resolution (FAR) fails. We validate this method using data from 450 stations during DOY 021 to 027, 2012. Results demonstrate the proposed PAR method can significantly shorten the time to first fix (TTFF) and increase the fixing rate. Compared with FAR, the average TTFF for PAR is reduced by 14.9% for static PPP and 15.1% for kinematic PPP. Besides, using the PAR method, the average fixing rate can be increased from 83.5% to 98.2% for static PPP, from 80.1% to 95.2% for kinematic PPP respectively. Kinematic PPP accuracy with PAR can also be significantly improved, compared to that with FAR, due to a higher fixing rate. PMID:26067196

  14. Fixed points of higher-derivative gravity.

    PubMed

    Codello, Alessandro; Percacci, Roberto

    2006-12-01

    We recalculate the beta functions of higher-derivative gravity in four dimensions using the one-loop approximation to an exact renormalization group equation. We reproduce the beta functions of the dimensionless couplings that were known in the literature, but we find new terms for the beta functions of Newton's constant and of the cosmological constant. As a result, the theory appears to be asymptotically safe at a non-Gaussian fixed point rather than perturbatively renormalizable and asymptotically free. PMID:17155791

  15. The Three Faces of a Fixed Point

    E-print Network

    Daniel Harlow; Stephen H. Shenker; Douglas Stanford; Leonard Susskind

    2012-03-26

    It has been argued that the only mathematically precise quantum descriptions of gravitating systems are from vantage points which allow an unbounded amount of information to be gathered. For an eternally inflating universe that means a hat, i.e., the asymptotic future of a flat FRW universe. The boundary of the hat (the place where it enters the bulk geometry) is the seat of the FRW/CFT duality. In this paper we discuss the perturbative and non-perturbative fixed points of FRW/CFT as seen from the three regions which share this boundary. Perturbatively, there is nothing universal about the FRW duality; there is a separate construction for each possible initial vacuum. We explain how bubble collisions induce a non-perturbative flow to a universal fixed point which contains information about the entire landscape. We also argue that there is a duality between the landscape of de Sitter vacua and a discretuum of very low-dimension relevant operators in the FRW/CFT spectrum. In principle this provides us with a precise definition of unstable de Sitter vacua. Along the way we show that BPS domain walls play a special role in reinforcing the "persistence of memory" and breaking the symmetries of the hat.

  16. Holographic non-Fermi-liquid fixed points.

    PubMed

    Faulkner, Tom; Iqbal, Nabil; Liu, Hong; McGreevy, John; Vegh, David

    2011-04-28

    Techniques arising from string theory can be used to study assemblies of strongly interacting fermions. Via this 'holographic duality', various strongly coupled many-body systems are solved using an auxiliary theory of gravity. Simple holographic realizations of finite density exhibit single-particle spectral functions with sharp Fermi surfaces, of a form distinct from those of the Landau theory. The self-energy is given by a correlation function in an infrared (IR) fixed-point theory that is represented by a two-dimensional anti de Sitter space (AdS(2)) region in the dual gravitational description. Here, we describe in detail the gravity calculation of this IR correlation function. PMID:21422019

  17. Neural Networks and Minimal Fixed Point Semantics for Logic Programs

    E-print Network

    Seda, Anthony Karel

    Neural Networks and Minimal Fixed Point Semantics for Logic Programs Vladimir Komendantsky School. In particular, we establish a minimal fixed point semantics for normal logic programs analogous to the least fixed point semantics for definite logic programs, and closely related to the well-known stable model

  18. Optimization of evacuation instructions as a fixed-point problem

    E-print Network

    Bierlaire, Michel

    Optimization of evacuation instructions as a fixed- point problem Olga Huibregtse Gunnar Flötteröd Michel Bierlaire Andreas Hegyi Serge Hoogendoorn STRC 2011 May 2011 #12;Optimization of evacuation instructions as a fixed-point problem May 2011 STRC 2011 Optimization of evacuation instructions as a fixed

  19. Collider Signals of Gravitational Fixed Points

    E-print Network

    JoAnne Hewett; Thomas Rizzo

    2007-07-21

    Recent studies have shown that the poor perturbative behavior of General Relativity in the ultraviolet regime may be ameliorated by the existence of a non-Gaussian fixed point which renders the theory asymptotically safe and possibly non-perturbatively renormalizable. This results in a running of the (effective) gravitational coupling such that gravity becomes weaker at high energies. We parameterize this effective coupling with a form factor and study its consequences at the LHC and ILC in models with large extra dimensions or warped extra dimensions. We find significant effects in the processes of Kaluza-Klein (KK) graviton exchange or resonant KK graviton production in both the Drell-Yan reaction as well as in $e^+e^-\\to f\\bar f$. On the otherhand, processes leading to KK graviton emission show qualitatively less sensitivity to the presence of a form factor. In addition, we examine tree-level perturbative unitarity in $2\\to 2$ gravity-mediated scattering and find that this form factor produces a far better behaved amplitude at large center of mass energies.

  20. Fixed point free elements of prime order Michael Giudici

    E-print Network

    Giudici, Michael

    Fixed point free elements of prime order Michael Giudici University of Western Australia #12;Orbit-transitive digraphs with no fixed point free automorphisms of prime order? Independently posed by Jordan in 1988. #12 free automorphisms of prime order? Independently posed by Jordan in 1988. A digraph is a Cayley digraph

  1. A new compact fixed-point blackbody furnace

    SciTech Connect

    Hiraka, K.; Oikawa, H.; Shimizu, T.; Kadoya, S.; Kobayashi, T.; Yamada, Y.; Ishii, J.

    2013-09-11

    More and more NMIs are realizing their primary scale themselves with fixed-point blackbodies as their reference standard. However, commercially available fixed-point blackbody furnaces of sufficient quality are not always easy to obtain. CHINO Corp. and NMIJ, AIST jointly developed a new compact fixed-point blackbody furnace. The new furnace has such features as 1) improved temperature uniformity when compared to previous products, enabling better plateau quality, 2) adoption of the hybrid fixed-point cell structure with internal insulation to improve robustness and thereby to extend lifetime, 3) easily ejectable and replaceable heater unit and fixed-point cell design, leading to reduced maintenance cost, 4) interchangeability among multiple fixed points from In to Cu points. The replaceable cell feature facilitates long term maintenance of the scale through management of a group of fixed-point cells of the same type. The compact furnace is easily transportable and therefore can also function as a traveling standard for disseminating the radiation temperature scale, and for maintaining the scale at the secondary level and industrial calibration laboratories. It is expected that the furnace will play a key role of the traveling standard in the anticipated APMP supplementary comparison of the radiation thermometry scale.

  2. Fixed points of quantum gravity in higher dimensions

    E-print Network

    Peter Fischer; Daniel F. Litim

    2006-06-15

    We study quantum gravity in more than four dimensions by means of an exact functional flow. A non-trivial ultraviolet fixed point is found in the Einstein-Hilbert theory. It is shown that our results for the fixed point and universal scaling exponents are stable. If the fixed point persists in extended truncations, quantum gravity in the metric field is asymptotically safe. We indicate physical consequences of this scenario in phenomenological models with low-scale quantum gravity and large extra dimensions.

  3. 47 CFR 101.137 - Interconnection of private operational fixed point-to-point microwave stations.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... point-to-point microwave stations. 101.137 Section 101.137 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES FIXED MICROWAVE SERVICES Technical Standards § 101.137 Interconnection of private operational fixed point-to-point microwave stations....

  4. 47 CFR 101.137 - Interconnection of private operational fixed point-to-point microwave stations.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... point-to-point microwave stations. 101.137 Section 101.137 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES FIXED MICROWAVE SERVICES Technical Standards § 101.137 Interconnection of private operational fixed point-to-point microwave stations....

  5. 47 CFR 101.137 - Interconnection of private operational fixed point-to-point microwave stations.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... point-to-point microwave stations. 101.137 Section 101.137 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES FIXED MICROWAVE SERVICES Technical Standards § 101.137 Interconnection of private operational fixed point-to-point microwave stations....

  6. 47 CFR 101.137 - Interconnection of private operational fixed point-to-point microwave stations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... point-to-point microwave stations. 101.137 Section 101.137 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES FIXED MICROWAVE SERVICES Technical Standards § 101.137 Interconnection of private operational fixed point-to-point microwave stations....

  7. 47 CFR 101.137 - Interconnection of private operational fixed point-to-point microwave stations.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... point-to-point microwave stations. 101.137 Section 101.137 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY AND SPECIAL RADIO SERVICES FIXED MICROWAVE SERVICES Technical Standards § 101.137 Interconnection of private operational fixed point-to-point microwave stations....

  8. Supersymmetric Quantum Mechanics and Lefschetz fixed-point formula

    E-print Network

    Si Li

    2005-11-09

    We review the explicit derivation of the Gauss-Bonet and Hirzebruch formulae by physical model and give a physical proof of the Lefschetz fixed-point formula by twisting boundary conditions for the path integral.

  9. 52. Fixed Span, Top Chord at Panel Point 6; diagonal ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    52. Fixed Span, Top Chord at Panel Point 6; diagonal member goes to intermediate connection 7 & then to bottom chord at 8; looking ESE. - Pacific Shortline Bridge, U.S. Route 20,spanning Missouri River, Sioux City, Woodbury County, IA

  10. Image integrity authentication scheme based on fixed point theory.

    PubMed

    Li, Xu; Sun, Xingming; Liu, Quansheng

    2015-02-01

    Based on the fixed point theory, this paper proposes a new scheme for image integrity authentication, which is very different from digital signature and fragile watermarking. By the new scheme, the sender transforms an original image into a fixed point image (very close to the original one) of a well-chosen transform and sends the fixed point image (instead of the original one) to the receiver; using the same transform, the receiver checks the integrity of the received image by testing whether it is a fixed point image and locates the tampered areas if the image has been modified during the transmission. A realization of the new scheme is based on Gaussian convolution and deconvolution (GCD) transform, for which an existence theorem of fixed points is proved. The semifragility is analyzed via commutativity of transforms, and three commutativity theorems are found for the GCD transform. Three iterative algorithms are presented for finding a fixed point image with a few numbers of iterations, and for the whole procedure of image integrity authentication; a fragile authentication system and a semifragile one are separately built. Experiments show that both the systems have good performance in transparence, fragility, security, and tampering localization. In particular, the semifragile system can perfectly resist the rotation by a multiple of 90° flipping and brightness attacks. PMID:25420259

  11. Stray thermal influences in zinc fixed-point cells

    SciTech Connect

    Rudtsch, S.; Aulich, A.; Monte, C.

    2013-09-11

    The influence of thermal effects is a major uncertainty contribution to the calibration of Standard Platinum Resistance Thermometers (SPRTs) in fixed-point cells. Axial heat losses strongly depend on the fixed-point temperature, constructional details of cells and SPRTs and the resulting heat transfer between cell, thermometer, furnace and environment. At the zinc point contributions by heat conduction and thermal radiation must be considered. Although the measurement of temperature gradients in the re-entrant well of a fixed-point cell provides very important information about the influence of axial heat losses, further investigations are required for a reliable estimate of the resulting uncertainty contribution. It is shown that specific modifications of a zinc fixed-point cell, following generally accepted principles, may result in systematic deviations of the measured fixed-point temperatures larger than typically stated in the uncertainty budget of National Metrology Institutes (NMIs). The underlying heat transport processes are investigated and the consequences for the construction of zinc cells are discussed.

  12. Fixed-Point Characterisation of Winning Strategies in Impartial Games

    E-print Network

    Backhouse, Roland

    overhead, and motivation is for free. In the study of games, as in the book \\Winning Ways" [BCG82], a basicFixed-Point Characterisation of Winning Strategies in Impartial Games Roland Backhouse # Diethard in impartial, two- person games. A byproduct is the #12;xed-point characterisation of winning, losing

  13. IR fixed points in $SU(3)$ gauge Theories

    E-print Network

    K. -I. Ishikawa; Y. Iwasaki; Yu Nakayama; Y. Yoshie

    2015-07-11

    We propose a novel RG method to specify the location of the IR fixed point in lattice gauge theories and apply it to the $SU(3)$ gauge theories with $N_f$ fundamental fermions. It is based on the scaling behavior of the propagator through the RG analysis with a finite IR cut-off, which we cannot remove in the conformal field theories in sharp contrast with the confining theories. The method also enables us to estimate the anomalous mass dimension in the continuum limit at the IR fixed point. We perform the program for $N_f=16, 12, 8 $ and $N_f=7$ and indeed identify the location of the IR fixed points in all cases.

  14. Fixed-Rate Compressed Floating-Point Arrays.

    PubMed

    Lindstrom, Peter

    2014-12-01

    Current compression schemes for floating-point data commonly take fixed-precision values and compress them to a variable-length bit stream, complicating memory management and random access. We present a fixed-rate, near-lossless compression scheme that maps small blocks of 4(d) values in d dimensions to a fixed, user-specified number of bits per block, thereby allowing read and write random access to compressed floating-point data at block granularity. Our approach is inspired by fixed-rate texture compression methods widely adopted in graphics hardware, but has been tailored to the high dynamic range and precision demands of scientific applications. Our compressor is based on a new, lifted, orthogonal block transform and embedded coding, allowing each per-block bit stream to be truncated at any point if desired, thus facilitating bit rate selection using a single compression scheme. To avoid compression or decompression upon every data access, we employ a software write-back cache of uncompressed blocks. Our compressor has been designed with computational simplicity and speed in mind to allow for the possibility of a hardware implementation, and uses only a small number of fixed-point arithmetic operations per compressed value. We demonstrate the viability and benefits of lossy compression in several applications, including visualization, quantitative data analysis, and numerical simulation. PMID:26356981

  15. Chiral-Scale Perturbation Theory About an Infrared Fixed Point

    E-print Network

    R. J. Crewther; Lewis C. Tunstall

    2014-01-31

    We review the failure of lowest order chiral $SU(3)_L \\times SU(3)_R$ perturbation theory $\\chi$PT$_3$ to account for amplitudes involving the $f_0(500)$ resonance and $O(m_K)$ extrapolations in momenta. We summarize our proposal to replace $\\chi$PT$_3$ with a new effective theory $\\chi$PT$_\\sigma$ based on a low-energy expansion about an infrared fixed point in 3-flavour QCD. At the fixed point, the quark condensate $\\langle\\bar{q}q\\rangle_\\mathrm{vac}\

  16. Measurement of thermodynamic temperature of high temperature fixed points

    SciTech Connect

    Gavrilov, V. R.; Khlevnoy, B. B.; Otryaskin, D. A.; Grigorieva, I. A.; Samoylov, M. L.; Sapritsky, V. I.

    2013-09-11

    The paper is devoted to VNIIOFI's measurements of thermodynamic temperature of the high temperature fixed points Co-C, Pt-C and Re-C within the scope of the international project coordinated by the Consultative Committee for Thermometry working group 5 'Radiation Thermometry'. The melting temperatures of the fixed points were measured by a radiance mode radiation thermometer calibrated against a filter radiometer with known irradiance spectral responsivity via a high temperature black body. This paper describes the facility used for the measurements, the results and estimated uncertainties.

  17. Kadanoff Sand Pile Model Avalanches and Fixed Points

    E-print Network

    Liège, Université de

    Kadanoff Sand Pile Model Avalanches and Fixed Points K´evin Perrot and ´Eric R´emila ´equipe MC2 #12;Aim of this work 1 2 D-1 ... #12;Introduction Definition Representation Known results Avalanches Inductive computation Avalanche as a carry the Snowball Conjecture Statement Approach and issues #12

  18. Fixed Point Problems for Linear Transformations on Pythagorean Triples

    ERIC Educational Resources Information Center

    Zhan, M.-Q.; Tong, J.-C.; Braza, P.

    2006-01-01

    In this article, an attempt is made to find all linear transformations that map a standard Pythagorean triple (a Pythagorean triple [x y z][superscript T] with y being even) into a standard Pythagorean triple, which have [3 4 5][superscript T] as their fixed point. All such transformations form a monoid S* under matrix product. It is found that S*…

  19. Development of Fixed-Point Cells at the SMU

    NASA Astrophysics Data System (ADS)

    ?uriš, S.; Ranostaj, J.; Palen?ár, R.

    2008-06-01

    One of the research programs realized at the thermometry laboratory of the Slovak Institute of Metrology (SMU) in recent years has focused on the development of fixed-point cells. In the frame of this research, several primary cells for realization of the International Temperature Scale of 1990 (ITS-90) and several secondary cells for industrial thermometer calibrations were built and studied. This article discusses primary cells for the gallium and mercury fixed points and miniature cells for the zinc point that were developed at the SMU. Information about the cell designs is provided, the materials that were used are specified, and the procedures for their manufacture are described. Briefly, the realization of the fixed points of mercury, gallium, and zinc by using these cells is also described. Many experiments were carried out to study the characteristics of these cells. One of the gallium cells was compared with the circulating transfer cell during the key comparison CCT-K3, and it and the mercury cell were used for the EUROMET Project No. 552. The results of the experiments together with the results of the comparisons show the high quality of these cells. Secondary zinc-point cells were compared against SMU primary zinc-point cells. The comparison shows agreement within 0.12 mK.

  20. Fixed point and coincidence theory on circle bouquets in ten minutes

    E-print Network

    Staecker, P. Christopher

    the "intersections", i.e. the places where the color matches up: Not too hard to see that the number of fixed pointsFixed point and coincidence theory on circle bouquets in ten minutes Chris Staecker MEB school meeting, March 25 2009 Staecker () Circle bouquets MEB 1 / 18 #12;Fixed Points A fixed point is some point

  1. A fixed-point framework for launch vehicle ascent guidance

    NASA Astrophysics Data System (ADS)

    Zhang, Lijun

    Recent interests in responsive launch have highlighted the need for rapid and fully automated ascent guidance planning and guidance parameter generation for launch vehicles. This dissertation aims at developing methodology and algorithms for on-demand generation of optimal launch vehicle ascent trajectories from lift-off to achieving targeting conditions outside the atmosphere. The entire ascent trajectory from lift-off to final target point is divided into two parts: atmospheric ascent portion and vacuum ascent portion. The two portions are integrated via a fixed-point iteration based on the continuity condition at the switch point between atmospheric ascent portion and vacuum ascent portion. The previous research works on closed-loop endo-atmospheric ascent guidance shows that the classical finite difference method is well suited for fast solution of the constrained optimal three-dimensional ascent problem. The exploitation of certain unique features in the integration procedure between the atmospheric portion and vacuum portion and the finite difference method, allows us to cast the atmospheric ascent problem into a nested fixed-point iteration problem. Therefore a novel Fixed-Point Iteration algorithm is presented for solving the endo-atmospheric ascent guidance problem. Several approaches are also provided for facilitating the convergence of the fixed-point iteration. The exo-atmospheric ascent portion allows an optimal coast in between the two vacuum powered stages. The optimal coast enables more efficient usage of the propellant. The Analytical Multiple-Shooting algorithm is developed to find the optimal trajectory for this portion. A generic launch vehicle model is adopted in the numerical simulation. A series of open-loop and closed-loop simulations are performed. The results verify the effectiveness, robustness and reliability of the Fixed-Point Iteration (FPI) algorithm and Analytical Multiple-Shooting (AMS) algorithm developed in this research. In comparison to Finite Difference (FD) algorithm, the Fixed-Point Iteration algorithm is more adaptive to the "cold start" case for endoatmospheric ascent guidance. The simulations also validate the feasibility of the methodology presented in this research in rapid panning and guidance for ascent through atmosphere.

  2. Non-Thermal Fixed Point in a Holographic Superfluid

    E-print Network

    Carlo Ewerz; Thomas Gasenzer; Markus Karl; Andreas Samberg

    2015-05-11

    We study the far-from-equilibrium dynamics of a (2+1)-dimensional superfluid at finite temperature and chemical potential using its holographic description in terms of a gravitational system in 3+1 dimensions. Starting from various initial conditions corresponding to ensembles of vortex defects we numerically evolve the system to long times. At intermediate times the system exhibits Kolmogorov scaling the emergence of which depends on the choice of initial conditions. We further observe a universal late-time regime in which the occupation spectrum and different length scales of the superfluid exhibit scaling behaviour. We study these scaling laws in view of superfluid turbulence and interpret the universal late-time regime as a non-thermal fixed point of the dynamical evolution. In the holographic superfluid the non-thermal fixed point can be understood as a stationary point of the classical equations of motion of the dual gravitational description.

  3. Fixed-rate compressed floating-point arrays

    Energy Science and Technology Software Center (ESTSC)

    2014-03-30

    ZFP is a library for lossy compression of single- and double-precision floating-point data. One of the unique features of ZFP is its support for fixed-rate compression, which enables random read and write access at the granularity of small blocks of values. Using a C++ interface, this allows declaring compressed arrays (1D, 2D, and 3D arrays are supported) that through operator overloading can be treated just like conventional, uncompressed arrays, but which allow the user tomore »specify the exact number of bits to allocate to the array. ZFP also has variable-rate fixed-precision and fixed-accuracy modes, which allow the user to specify a tolerance on the relative or absolute error.« less

  4. Gravity Duals of Lifshitz-Like Fixed Points

    SciTech Connect

    Kachru, Shamit; Liu, Xiao; Mulligan, Michael; /Stanford U., Phys. Dept. /SLAC

    2008-11-05

    We find candidate macroscopic gravity duals for scale-invariant but non-Lorentz invariant fixed points, which do not have particle number as a conserved quantity. We compute two-point correlation functions which exhibit novel behavior relative to their AdS counterparts, and find holographic renormalization group flows to conformal field theories. Our theories are characterized by a dynamical critical exponent z, which governs the anisotropy between spatial and temporal scaling t {yields} {lambda}{sup z}t, x {yields} {lambda}x; we focus on the case with z = 2. Such theories describe multicritical points in certain magnetic materials and liquid crystals, and have been shown to arise at quantum critical points in toy models of the cuprate superconductors. This work can be considered a small step towards making useful dual descriptions of such critical points.

  5. Banks-Zaks fixed point analysis in momentum subtraction schemes

    E-print Network

    J. A. Gracey; R. M. Simms

    2015-04-01

    We analyse the critical exponents relating to the quark mass anomalous dimension and beta-function at the Banks-Zaks fixed point in Quantum Chromodynamics (QCD) in a variety of representations for the quark in the momentum subtraction (MOM) schemes of Celmaster and Gonsalves. For a specific range of values of the number of quark flavours, estimates of the exponents appear to be scheme independent. Using the recent five loop modified minimal subtraction (MSbar) scheme quark mass anomalous dimension and estimates of the fixed point location we estimate the associated exponent as 0.263-0.268 for the SU(3) colour group and 12 flavours when the quarks are in the fundamental representation.

  6. Thermal analysis on the realization of the tin fixed point

    NASA Astrophysics Data System (ADS)

    Tsai, S. F.

    2013-09-01

    A study on the thermal analysis of a new tin fixed-point open cell within a new three-zone furnace was carried out. The stability at the setting temperatures of liquid-solid coexisting together with some degree Celsius lower and higher than the tin fixed point; and the axial uniformity of furnace while tin is still in solid phase were investigated and analyzed. The impurities effect on the depression in temperature was investigated in terms of ?T (Tobserved-T1/F=0) and the inverse of the melted fraction (1/F) relationship during the melting and the following freezing realizations at various temperature settings of furnace. These thermal analysis results were also compared with those estimated by the CCT-WG1 recommended SIE (sum of individual estimates) method, which leads to a temperature correction along with a corresponding uncertainty through the individual impurity content detected by GDMS (glow discharge mass spectrometry).

  7. Renormalization Fixed Point of the KPZ Universality Class

    NASA Astrophysics Data System (ADS)

    Corwin, Ivan; Quastel, Jeremy; Remenik, Daniel

    2015-08-01

    The one dimensional Kardar-Parisi-Zhang universality class is believed to describe many types of evolving interfaces which have the same characteristic scaling exponents. These exponents lead to a natural renormalization/rescaling on the space of such evolving interfaces. We introduce and describe the renormalization fixed point of the Kardar-Parisi-Zhang universality class in terms of a random nonlinear semigroup with stationary independent increments, and via a variational formula. Furthermore, we compute a plausible formula the exact transition probabilities using replica Bethe ansatz. The semigroup is constructed from the Airy sheet, a four parameter space-time field which is the Airy process in each of its two spatial coordinates. Minimizing paths through this field describe the renormalization group fixed point of directed polymers in a random potential. At present, the results we provide do not have mathematically rigorous proofs, and they should at most be considered proposals.

  8. Fixed points, stable manifolds, weather regimes, and their predictability

    SciTech Connect

    Deremble, Bruno; D'Andrea, Fabio; Ghil, Michael

    2009-10-27

    In a simple, one-layer atmospheric model, we study the links between low-frequency variability and the model’s fixed points in phase space. The model dynamics is characterized by the coexistence of multiple ''weather regimes.'' To investigate the transitions from one regime to another, we focus on the identification of stable manifolds associated with fixed points. We show that these manifolds act as separatrices between regimes. We track each manifold by making use of two local predictability measures arising from the meteorological applications of nonlinear dynamics, namely, ''bred vectors'' and singular vectors. These results are then verified in the framework of ensemble forecasts issued from clouds (ensembles) of initial states. The divergence of the trajectories allows us to establish the connections between zones of low predictability, the geometry of the stable manifolds, and transitions between regimes.

  9. Banks-Zaks fixed point analysis in momentum subtraction schemes

    E-print Network

    Gracey, J A

    2015-01-01

    We analyse the critical exponents relating to the quark mass anomalous dimension and beta-function at the Banks-Zaks fixed point in Quantum Chromodynamics (QCD) in a variety of representations for the quark in the momentum subtraction (MOM) schemes of Celmaster and Gonsalves. For a specific range of values of the number of quark flavours, estimates of the exponents appear to be scheme independent. Using the recent five loop modified minimal subtraction (MSbar) scheme quark mass anomalous dimension and estimates of the fixed point location we estimate the associated exponent as 0.263-0.268 for the SU(3) colour group and 12 flavours when the quarks are in the fundamental representation.

  10. Fixed points, stable manifolds, weather regimes, and their predictability

    DOE PAGESBeta

    Deremble, Bruno; D'Andrea, Fabio; Ghil, Michael

    2009-10-27

    In a simple, one-layer atmospheric model, we study the links between low-frequency variability and the model’s fixed points in phase space. The model dynamics is characterized by the coexistence of multiple ''weather regimes.'' To investigate the transitions from one regime to another, we focus on the identification of stable manifolds associated with fixed points. We show that these manifolds act as separatrices between regimes. We track each manifold by making use of two local predictability measures arising from the meteorological applications of nonlinear dynamics, namely, ''bred vectors'' and singular vectors. These results are then verified in the framework of ensemblemore »forecasts issued from clouds (ensembles) of initial states. The divergence of the trajectories allows us to establish the connections between zones of low predictability, the geometry of the stable manifolds, and transitions between regimes.« less

  11. Parabolic fixed points and stability criteria for nonlinear Hill's equation

    NASA Astrophysics Data System (ADS)

    Núñez, D.; Ortega, R.

    We discuss the stability of parabolic fixed points of area-preserving mappings and obtain a new proof of a criterion due to Simó. These results are employed to discuss the stability of the equilibrium of certain periodic differential equations of newtonian type. An example is the pendulum of variable length. In this class of equations the First Lyapunov's Method does not apply but in many cases the stability can be characterized in terms of the variational equation.

  12. Fixed point structure of quenched, planar quantum electrodynamics

    SciTech Connect

    Love, S.T.

    1986-07-01

    Gauge theories exhibiting a hierarchy of fermion mass scales may contain a pseudo-Nambu-Boldstone boson of spontaneously broken scale invariance. The relation between scale and chiral symmetry breaking is studied analytically in quenched, planar quantum electrodynamics in four dimensions. The model possesses a novel nonperturbative ultraviolet fixed point governing its strong coupling phase which requires the mixing of four fermion operators. 12 refs.

  13. On TwoSided Infinite Fixed Points of Morphisms Jeffrey Shallit \\Lambda and Mingwei Wang

    E-print Network

    Shallit, Jeffrey O.

    On Two­Sided Infinite Fixed Points of Morphisms Jeffrey Shallit \\Lambda and Ming­wei Wang : \\Sigma \\Lambda ! \\Sigma \\Lambda be a morphism. Finite and infinite fixed points of morphisms --- i characterized the finite fixed points of h, and later, Head and Lando characterized the one­sided infinite fixed

  14. Signatures of gravitational fixed points at the LHC

    E-print Network

    Daniel F. Litim; Tilman Plehn

    2008-02-21

    We study quantum-gravitational signatures at the Large Hadron Collider (LHC) in the context of theories with extra spatial dimensions and a low fundamental Planck scale in the TeV range. Implications of a gravitational fixed point at high energies are worked out using Wilson's renormalisation group. We find that relevant cross-sections involving virtual gravitons become finite. Based on gravitational lepton pair production we conclude that the LHC is sensitive to a fundamental Planck scale of up to 6 TeV.

  15. Infrared Fixed Points in the minimal MOM Scheme

    E-print Network

    Thomas A. Ryttov

    2014-03-17

    We analyze the behavior of several renormalization group functions at infrared fixed points for $SU(N)$ gauge theories with fermions in the fundamental and two-indexed representations. This includes the beta function of the gauge coupling, the anomalous dimension of the gauge parameter and the anomalous dimension of the mass. The scheme in which the analysis is performed is the minimal momentum subtraction scheme through third loop order. Due to the fact that scheme dependence is inevitable once the perturbation theory is truncated we compare to previous identical studies done in the minimal subtraction scheme and the modified regularization invariant scheme. We find only mild to moderate scheme dependence.

  16. Accuracy and Efficiency in Fixed-Point Neural ODE Solvers.

    PubMed

    Hopkins, Michael; Furber, Steve

    2015-10-01

    Simulation of neural behavior on digital architectures often requires the solution of ordinary differential equations (ODEs) at each step of the simulation. For some neural models, this is a significant computational burden, so efficiency is important. Accuracy is also relevant because solutions can be sensitive to model parameterization and time step. These issues are emphasized on fixed-point processors like the ARM unit used in the SpiNNaker architecture. Using the Izhikevich neural model as an example, we explore some solution methods, showing how specific techniques can be used to find balanced solutions. We have investigated a number of important and related issues, such as introducing explicit solver reduction (ESR) for merging an explicit ODE solver and autonomous ODE into one algebraic formula, with benefits for both accuracy and speed; a simple, efficient mechanism for cancelling the cumulative lag in state variables caused by threshold crossing between time steps; an exact result for the membrane potential of the Izhikevich model with the other state variable held fixed. Parametric variations of the Izhikevich neuron show both similarities and differences in terms of algorithms and arithmetic types that perform well, making an overall best solution challenging to identify, but we show that particular cases can be improved significantly using the techniques described. Using a 1 ms simulation time step and 32-bit fixed-point arithmetic to promote real-time performance, one of the second-order Runge-Kutta methods looks to be the best compromise; Midpoint for speed or Trapezoid for accuracy. SpiNNaker offers an unusual combination of low energy use and real-time performance, so some compromises on accuracy might be expected. However, with a careful choice of approach, results comparable to those of general-purpose systems should be possible in many realistic cases. PMID:26313605

  17. Fixed Point Transformations Based Iterative Control of a Polymerization Reaction

    NASA Astrophysics Data System (ADS)

    Tar, József K.; Rudas, Imre J.

    As a paradigm of strongly coupled non-linear multi-variable dynamic systems the mathematical model of the free-radical polymerization of methyl-metachrylate with azobis (isobutyro-nitrile) as an initiator and toluene as a solvent taking place in a jacketed Continuous Stirred Tank Reactor (CSTR) is considered. In the adaptive control of this system only a single input variable is used as the control signal (the process input, i.e. dimensionless volumetric flow rate of the initiator), and a single output variable is observed (the process output, i.e. the number-average molecular weight of the polymer). Simulation examples illustrate that on the basis of a very rough and primitive model consisting of two scalar variables various fixed-point transformations based convergent iterations result in a novel, sophisticated adaptive control.

  18. Multi-Valued Modal Fixed Point Logics for Model Checking

    NASA Astrophysics Data System (ADS)

    Nishizawa, Koki

    In this paper, I will show how multi-valued logics are used for model checking. Model checking is an automatic technique to analyze correctness of hardware and software systems. A model checker is based on a temporal logic or a modal fixed point logic. That is to say, a system to be checked is formalized as a Kripke model, a property to be satisfied by the system is formalized as a temporal formula or a modal formula, and the model checker checks that the Kripke model satisfies the formula. Although most existing model checkers are based on 2-valued logics, recently new attempts have been made to extend the underlying logics of model checkers to multi-valued logics. I will summarize these new results.

  19. Holographic Correlators in a Flow to a Fixed Point

    E-print Network

    Marcus Berg; Henning Samtleben

    2003-03-20

    Using holographic renormalization, we study correlation functions throughout a renormalization group flow between two-dimensional superconformal field theories. The ultraviolet theory is an N=(4,4) CFT which can be thought of as a symmetric product of U(2) super WZW models. It is perturbed by a relevant operator which preserves one-quarter supersymmetry and drives the theory to an infrared fixed point. We compute correlators of the stress-energy tensor and of the relevant operators dual to supergravity scalars. Using the former, we put together Zamolodchikov's C function, and contrast it with proposals for a holographic C function. In passing, we address and resolve two puzzles also found in the case of five-dimensional bulk supergravity.

  20. A Fixed-Point Iteration Method with Quadratic Convergence

    SciTech Connect

    Walker, Kevin P.; Sham, Sam

    2012-01-01

    The fixed-point iteration algorithm is turned into a quadratically convergent scheme for a system of nonlinear equations. Most of the usual methods for obtaining the roots of a system of nonlinear equations rely on expanding the equation system about the roots in a Taylor series, and neglecting the higher order terms. Rearrangement of the resulting truncated system then results in the usual Newton-Raphson and Halley type approximations. In this paper the introduction of unit root functions avoids the direct expansion of the nonlinear system about the root, and relies, instead, on approximations which enable the unit root functions to considerably widen the radius of convergence of the iteration method. Methods for obtaining higher order rates of convergence and larger radii of convergence are discussed.

  1. An International Star Intercomparison of Low-Temperature Fixed Points Using Sealed Triple-Point Cells

    NASA Astrophysics Data System (ADS)

    Fellmuth, B.; Berger, D.; Wolber, L.; de Groot, M.; Head, D.; Hermier, Y.; Mao, Y. Z.; Nakano, T.; Pavese, F.; Shkraba, V.; Steele, A. G.; Steur, P. P. M.; Szmyrka-Grzebyk, A.; Tew, W. L.; Wang, L.; White, D. R.

    2003-09-01

    An overview of the main results of an international star intercomparison of low-temperature fixed points is given. Between 1997 and 2002, 52 sealed triple-point cells (STPCs) of the thirteen laboratories represented by the authors have been investigated at PTB. The STPCs are used to realise the triple points of hydrogen, neon, oxygen, and argon, respectively, as defining fixed points of the International Temperature Scale of 1990, ITS-90. The melting curves of all STPCs have been measured on the same experimental equipment, adhering strictly to a single measurement program. This protocol enables separation of the effects influencing the melting curves and direct comparison of the thermal behaviour of the STPCs, which are quite different with respect to design, age, gas source, and filling technology. In the paper, emphasis is given to the typical properties of the four fixed-point substances and to the spread of the STPC parameters. Connections between the star intercomparison and completed and on-going international activities, including the CIPM Key Comparisons, are also discussed.

  2. Clinical Evaluation of Proximal Contact Points in Fixed Prostheses.

    PubMed

    Akhtar, Qayyum; Danyal, Sadia; Zareen, Shazia; Ahmed, Bilal; Maqsood, Muzamil; Azad, Azad Ali

    2015-09-01

    This cross-sectional study clinically assesses the tightness of proximal contact points of fixed dental prosthesis with natural teeth. Sixty nine (69) patients visiting the Department of Prosthodontics, Armed Forces Institute of Dentists (AFID), Rawalpindi, were included. The crowns, as a single unit or terminal abutment of bridge, prepared and fabricated at the same institute were included. A total of 142 Proximal Contact Points (PCPs) were assessed with the dental floss and categorized as acceptable, loose and tight. Among these, 83 (58.4%) were acceptable, 41 (28.8%) loose and 18 (12.6%) were tight. Out of 142 PCPs, 104 (73.2%) were Porcelain Fused to Metal (PFM) and 38 (26.7%), all metal. Out of 104 PFM crown/FPD PCPs 59 (56.7%) were acceptable, 32 (30.7%) were loose and 13 (12.5%) tight. Out of 38 all metal crown/FPD PCPs 24 (63%) acceptable, 9 (23%) were loose and 5 (13%) were tight. PCPs must be checked for acceptability before cementation. The PCPs of adjacent natural dentition in same patient may serve as guide for assessment. PMID:26374372

  3. String Unification, Spaghetti Diagrams and Infra-Red Fixed Points

    E-print Network

    Allanach, Benjamin C

    1997-01-01

    We consider a scenario in which the minimal supersymmetric standard model (MSSM) is valid up to an energy scale of 10^16 GeV, but that above this scale the theory is supplemented by extra vector-like representations of the gauge group, plus a gauged U(1)_X family symmetry. In our approach the extra heavy matter above the scale 10^{16} GeV is used in two different ways: (1) to allow (two-loop) gauge coupling unification at the string scale; (2) to mix with quarks, leptons and Higgs fields via spaghetti diagrams and so lead to phenomenologically acceptable Yukawa textures. We determine the most economical models in which the extra matter can satisfy both constraints simultaneously. We then give a general discussion of the infra-red fixed points of such models, pointing out the conditions for infra-red stability, then discuss two semi-realistic examples: a Higgs mixing model, and a quark mixing model.

  4. COMPLEX FIXED-POINT ICA ALGORITHM FOR SEPARATION OF QAM SOURCES USING GAUSSIAN MIXTURE MODEL

    E-print Network

    Adali, Tulay

    . The algorithm matches the input QAM distribution through a mixture of Gaus- sian kernels and uses fixedCOMPLEX FIXED-POINT ICA ALGORITHM FOR SEPARATION OF QAM SOURCES USING GAUSSIAN MIXTURE MODEL Mike@umbc.edu} ABSTRACT 2. C-QAM ALGORITHM We introduce a fixed-point algorithm, the complex QAM (C-QAM) algorithm

  5. A composite Higgs model at a conformal fixed point

    E-print Network

    Brower, R C; Rebbi, C; Weinberg, E; Witzel, O

    2015-01-01

    We propose to construct a chirally broken model based on the infrared fixed point of a conformal system by raising the mass of some flavors while keeping the others massless. In the infrared limit the massive fermions decouple and the massless fermions break chiral symmetry. The running coupling of this system "walks" and the energy range of walking can be tuned by the mass of the heavy flavors. Renormalization group considerations predict that the spectrum of such a system shows hyperscaling. We have studied a model with four light and eight heavy flavors coupled to SU(3) gauge fields and verified the above expectations. We determined the mass of several hadronic states and found that some of them are in the 2-3 TeV range if the scale is set by the pseudoscalar decay constant $F_\\pi \\approx 250$ GeV. The $0^{++}$ scalar state behaves very differently from the other hadronic states. In most of our simulations it is nearly degenerate with the pion and we estimate its mass to be less than half of the vector res...

  6. Memory difference control of unknown unstable fixed points: Drifting parameter conditions and delayed measurement

    E-print Network

    Jens Christian Claussen; Thorsten Mausbach; Alexander Piel; Heinz Georg Schuster

    2006-09-20

    Difference control schemes for controlling unstable fixed points become important if the exact position of the fixed point is unavailable or moving due to drifting parameters. We propose a memory difference control method for stabilization of a priori unknown unstable fixed points by introducing a memory term. If the amplitude of the control applied in the previous time step is added to the present control signal, fixed points with arbitrary Lyapunov numbers can be controlled. This method is also extended to compensate arbitrary time steps of measurement delay. We show that our method stabilizes orbits of the Chua circuit where ordinary difference control fails.

  7. A New FixedPoint Theorem for Logic Programming Pascal Hitzler \\Lambda and Anthony K. Seda

    E-print Network

    Hitzler, Pascal

    A New Fixed­Point Theorem for Logic Programming Semantics Pascal Hitzler \\Lambda and Anthony K: http://maths.ucc.ie/¸fpascal,sedag Abstract We present a new fixed­point theorem akin to the Banach contraction mapping theorem, but in the context of a novel notion of generalized metric space, and show how

  8. A Fixed Point Charge Model for Water Optimized to the Vapor-Liquid Coexistence Properties

    E-print Network

    A Fixed Point Charge Model for Water Optimized to the Vapor-Liquid Coexistence Properties Jeffrey R@ipst.umd.edu #12;1 Abstract A new fixed-point charge potential model for water has been developed, targeting the accurate prediction of the vapor-liquid coexistence properties over a broad temperature range. The model

  9. THE PROPORTION OF FIXED-POINT-FREE ELEMENTS OF A TRANSITIVE PERMUTATION GROUP

    E-print Network

    Jackson, David A.

    . THE PROPORTION OF FIXED-POINT-FREE ELEMENTS OF A TRANSITIVE PERMUTATION GROUP Nigel Boston the following question: if G is a transitive permutation group of degree n and A is the set of elements of G;2 FIXED-POINT-FREE ELEMENTS OF A TRANSITIVE GROUP wreath product or a direct product of permutation groups

  10. Many flavor QCD as exploration of the walking behavior with the approximate IR fixed point

    E-print Network

    Yasumichi Aoki; Tatsumi Aoyama; Masafumi Kurachi; Toshihide Maskawa; Kei-ichi Nagai; Hiroshi Ohki; Akihiro Shibata; Koichi Yamawaki; Takeshi Yamazaki

    2012-02-21

    We present the first report of the LatKMI collaboration on the the lattice QCD simulation performed at the KMI computer, "$\\varphi$", for the cases of 4 flavors and 8 flavors, the latter being expected to be a candidate for the walking technicolor having an approximate scale invariance near the infrared fixed point. The simulation was carried out based on the highly improved staggered quark (HISQ) action. In this proceedings, we report preliminary results on the spectrum, analyzed through the chiral perturbation theory and the finite-size hyperscaling. We observe qualitatively different behavior of the 8-flavor case in contrast to the 4-flavor case which shows clear indication of the hadronic phase as in the usual QCD.

  11. Triple point of e-deuterium as an accurate thermometric fixed point

    SciTech Connect

    Pavese, F.; McConville, G.T.

    1986-01-01

    The triple point of deuterium (18.7/sup 0/K) is the only possibility for excluding vapor pressure measurements in the definition of a temperature scale based on fixed points between 13.81 and 24.562/sup 0/K. This paper reports an investigation made at the Istituto di Metrologia and Mound Laboratory, using extremely pure deuterium directly sealed at the production plant into small metal cells. The large contamination by HD of commercially available gas, that cannot be accounted and corrected for due to its increase in handling, was found to be very stable with time after sealing in IMGC cells. HD contamination can be limited to less than 100 ppM in Monsanto cells, both with n-D/sub 2/ and e-D/sub 2/, when filled directly from the thermal diffusion column and sealed at the factory. e-D/sub 2/ requires a special deuterated catalyst. The triple point temperature of e-D/sub 2/ has been determined to be: T(NPL-IPTS-68) = 18.7011 +- 0.002/sup 0/K. 20 refs., 3 figs., 2 tabs.

  12. Parameter Space of Fixed Points of the Damped Driven Pendulum Susceptible to Control of Chaos Algorithms

    NASA Astrophysics Data System (ADS)

    Dittmore, Andrew; Trail, Collin; Olsen, Thomas; Wiener, Richard J.

    2003-11-01

    We have previously demonstrated the experimental control of chaos in a Modified Taylor-Couette system with hourglass geometry( Richard J. Wiener et al), Phys. Rev. Lett. 83, 2340 (1999).. Identifying fixed points susceptible to algorithms for the control of chaos is key. We seek to learn about this process in the accessible numerical model of the damped, driven pendulum. Following Baker(Gregory L. Baker, Am. J. Phys. 63), 832 (1995)., we seek points susceptible to the OGY(E. Ott, C. Grebogi, and J. A. Yorke, Phys. Rev. Lett. 64), 1196 (1990). algorithm. We automate the search for fixed points that are candidates for control. We present comparisons of the space of candidate fixed points with the bifurcation diagrams and Poincare sections of the system. We demonstrate control at fixed points which do not appear on the attractor. We also show that the control algorithm may be employed to shift the system between non-communicating branches of the attractor.

  13. Computable counter-examples to the Brouwer fixed-point theorem

    E-print Network

    Petrus H. Potgieter

    2008-04-21

    This paper is an overview of results that show the Brouwer fixed-point theorem (BFPT) to be essentially non-constructive and non-computable. The main results, the counter-examples of Orevkov and Baigger, imply that there is no procedure for finding the fixed point in general by giving an example of a computable function which does not fix any computable point. Research in reverse mathematics has shown the BFPT to be equivalent to the weak K\\"onig lemma in RCA$_0$ (the system of recursive comprehension) and this result is illustrated by relating the weak K\\"onig lemma directly to the Baigger example.

  14. Simple Process Equations, Fixed-Point Methods, and Chaos

    E-print Network

    Lucia, Angelo

    substitution follows a classical period-doubling route to chaos. On the other hand, the chaotic behavior give the appearance that no organized route to chaos is followed. For example, for the dew point process model equations. Accordingly, this paper is organized in the following way. First a brief survey

  15. Melting Temperature of High-Temperature Fixed Points for Thermocouple Calibrations

    NASA Astrophysics Data System (ADS)

    Pearce, J. V.; Montag, V.; Lowe, D.; Dong, W.

    2011-01-01

    Thermocouples can be calibrated at pure metal ingot-based fixed points at temperatures up to the freezing point of copper (1084.62 °C). For Pt/Pd thermocouples, the deviation from the accepted reference function very often takes an approximately linear form up to the copper fixed point. The calibration of Pt/Pd thermocouples may therefore be more amenable to extrapolation than that of Pt/Pt-Rh thermocouples. Here, the melting temperatures of a Co-C and a Pd-C eutectic fixed point are determined by extrapolating the deviation functions of several Pt/Pd thermocouples, after the fashion of Edler et al. The results are compared with the melting temperatures measured using non-contact radiation thermometry. The expanded uncertainty ( k = 2) of the melting temperatures determined by extrapolation of the Pt/Pd thermocouple calibrations is ±0.32 °C for the Co-C fixed point, and ±0.49 °C for the Pd-C fixed point. For both fixed points, these uncertainties are comparable to those of non-contact radiation thermometry measurements. While a number of assumptions are made in performing the extrapolation of the calibrations, the method does appear to offer a useful complement to non-contact radiation thermometry measurements.

  16. ON GUPTA-BELNAP REVISION THEORIES OF TRUTH, KRIPKEAN FIXED POINTS, AND THE NEXT STABLE SET.

    E-print Network

    Welch, Philip

    ON GUPTA-BELNAP REVISION THEORIES OF TRUTH, KRIPKEAN FIXED POINTS concepts associated with the revision theory* * of truth of Gupta and Belnap. We categorize the notions definable using their theory of circu* *lar definitions as those notions universally

  17. 47 CFR 90.473 - Operation of internal transmitter control systems through licensed fixed control points.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... Transmitter Control Internal Transmitter Control Systems § 90.473 Operation of internal transmitter control systems through licensed fixed control points. An internal transmitter control system may be operated... internal system from the transmitter control circuit or to close the system......

  18. Evaluation of the Pd-C eutectic fixed point and the Pt/Pd thermocouple

    NASA Astrophysics Data System (ADS)

    Pearce, J. V.; Ogura, H.; Izuchi, M.; Machin, G.

    2009-10-01

    A Pd-C eutectic fixed point cell (1492 °C) was constructed to investigate its utility for thermocouple calibration. The primary aim of the study was to evaluate the long-term stability, immersion characteristics (influence of heat conduction along the thermocouple stem) and robustness of a Pd-C fixed point using a Pt/Pd thermocouple, especially constructed for this purpose. The performance of both devices at this relatively high temperature could therefore be tested. The melting and freezing plateaux at the Pd-C eutectic point were measured using the Pt/Pd thermocouple. The total exposure to the Pd-C melting temperature was about 850 h for the fixed point cell and 550 h for the thermocouple. The standard deviations of the melting and freezing points were 1.03 µV (0.041 °C) and 0.77 µV (0.031 °C) respectively. The emfs of the thermocouple at the melting point were observed to drift by about 0.1 °C. The immersion measurements show that for the current cell design, the measuring junction should be at most 30 mm from the bottom of the thermowell to be properly immersed. The long-term performance and robustness of the fixed point indicate a promising future for its use as a fixed point for calibration of noble metal thermocouples.

  19. Extending the Nonlinear-Beam-Dynamics Concept of 1D Fixed Points to 2D Fixed Lines

    NASA Astrophysics Data System (ADS)

    Franchetti, G.; Schmidt, F.

    2015-06-01

    The origin of nonlinear dynamics traces back to the study of the dynamics of planets with the seminal work of Poincaré at the end of the nineteenth century: Les Méthodes Nouvelles de la Mécanique Céleste, Vols. 1-3 (Gauthier Villars, Paris, 1899). In his work he introduced a methodology fruitful for investigating the dynamical properties of complex systems, which led to the so-called "Poincaré surface of section," which allows one to capture the global dynamical properties of a system, characterized by fixed points and separatrices with respect to regular and chaotic motion. For two-dimensional phase space (one degree of freedom) this approach has been extremely useful and applied to particle accelerators for controlling their beam dynamics as of the second half of the twentieth century. We describe here an extension of the concept of 1D fixed points to fixed lines in two dimensions. These structures become the fundamental entities for characterizing the nonlinear motion in the four-dimensional phase space (two degrees of freedom).

  20. Extending the Nonlinear-Beam-Dynamics Concept of 1D Fixed Points to 2D Fixed Lines.

    PubMed

    Franchetti, G; Schmidt, F

    2015-06-12

    The origin of nonlinear dynamics traces back to the study of the dynamics of planets with the seminal work of Poincaré at the end of the nineteenth century: Les Méthodes Nouvelles de la Mécanique Céleste, Vols. 1-3 (Gauthier Villars, Paris, 1899). In his work he introduced a methodology fruitful for investigating the dynamical properties of complex systems, which led to the so-called "Poincaré surface of section," which allows one to capture the global dynamical properties of a system, characterized by fixed points and separatrices with respect to regular and chaotic motion. For two-dimensional phase space (one degree of freedom) this approach has been extremely useful and applied to particle accelerators for controlling their beam dynamics as of the second half of the twentieth century. We describe here an extension of the concept of 1D fixed points to fixed lines in two dimensions. These structures become the fundamental entities for characterizing the nonlinear motion in the four-dimensional phase space (two degrees of freedom). PMID:26196806

  1. Slip instability development and earthquake nucleation as a dynamical system's fixed-point attraction

    NASA Astrophysics Data System (ADS)

    Viesca, R. C.

    2014-12-01

    A fault's transition from slow creep to the propagation of an earthquake-generating dynamic rupture is thought to start as a quasi-static slip instability. Here we examine how such an instability develops on a sliding interface whose strength is governed by a slip rate- and state-dependent friction, where the state variable evolves according to the aging law. We find that the development occurs as the attraction of a dynamical system to a fixed point. The fixed points are such that the state of slip and the rate at which velocity diverges (and its spatial distribution) are known. The fixed points are independent of the manner of external forcing and the values of slip rate and state before the onset of instability. For a fault under uniform normal stress and frictional properties, the sole parameter that determines the fixed point (to within a translational invariance) is the ratio of the frictional parameters, a/b (where, for steady-state rate weakening, 0fixed points are asymptotically stable; however, stability is lost for a/b above that value. Increasing a/b above this critical value leads to a series of Hopf bifurcations. This cascade of bifurcations signals a quasi-periodic route to chaos, implying the existence of a second, larger, critical value of a/b (corresponding to the value at which the third Hopf bifurcation occurs), above which the slip instability may develop in a chaotic fashion. The fixed-point solutions, as well as the critical thresholds concerning their stability, depend on the configuration of slip (e.g., in/anti-plane or mixed-mode slip) and the elastic environment in which the interface is embedded (e.g., a slip surface between elastic half-spaces or one lying below and parallel to a free surface); solving for a fixed point reduces to the solution of an equivalent problem of an equilibrium slip-weakening fracture; and fixed-point stability is determined by linear stability analysis. Solutions of the fixed points and results concerning their stability are found either numerically or in closed form. For comparison, we find numerical solutions of instability development for given initial conditions and forcing. The resulting behaviors of the dynamical system conform precisely to expectations set by the fixed points and the analysis of their stability.

  2. A New Fixed-Point Theorem for Logic Programming Pascal Hitzler and Anthony K. Seda

    E-print Network

    Hitzler, Pascal

    A New Fixed-Point Theorem for Logic Programming Semantics Pascal Hitzler and Anthony K. Seda://maths.ucc.ie/ fpascal,sedag Abstract We present a new xed-point theorem akin to the Banach contraction mapping theorem the denotational semantics of certain logic programs. The theorem is obtained by generaliz- ing a theorem of Priess

  3. Infra-Red Stable Fixed Points of Yukawa Couplings in Supersymmetric Models

    E-print Network

    Allanach, Benjamin C

    1997-01-01

    We provide the solutions of the fixed point conditions of the Yukawa sector for a large class of N=1 supersymmetric theories including the minimal and next-to-minimal supersymmetric standard models and their grand unified and other extensions. We also introduce a test which can discriminate between infra-red stable, infra-red unstable and saddle point solutions, and illustrate our methods with the example of the next-to-minimal supersymmetric standard model. We show that in this case, the fixed point prediction of the top quark mass is equivalent to that of the minimal supersymmetric standard model, supporting previous numerical analyses.

  4. Dark energy as a fixed point of the Einstein Yang-Mills Higgs equations

    NASA Astrophysics Data System (ADS)

    Rinaldi, Massimiliano

    2015-10-01

    We study the Einstein Yang-Mills Higgs equations in the SO(3) representation on a isotropic and homogeneous flat Universe, in the presence of radiation and matter fluids. We map the equations of motion into an autonomous dynamical system of first-order differential equations and we find the equilibrium points. We show that there is only one stable fixed point that corresponds to an accelerated expanding Universe in the future. In the past, instead, there is an unstable fixed point that implies a stiff-matter domination. In between, we find three other unstable fixed points, corresponding, in chronological order, to radiation domination, to matter domination, and, finally, to a transition from decelerated expansion to accelerated expansion. We solve the system numerically and we confirm that there are smooth trajectories that correctly describe the evolution of the Universe, from a remote past dominated by radiation to a remote future dominated by dark energy, passing through a matter-dominated phase.

  5. Infrared fixed point of the 12-fermion SU(3) gauge model based on 2-lattice MCRG matching

    E-print Network

    Anna Hasenfratz

    2011-06-27

    I investigate an SU(3) gauge model with 12 fundamental fermions. The physically interesting region of this strongly coupled system can be influenced by an ultraviolet fixed point due to lattice artifacts. I suggest to use a gauge action with an additional negative adjoint plaquette term that lessens this problem. I also introduce a new analysis method for the 2-lattice matching Monte Carlo renormalization group technique that significantly reduces finite volume effects. The combination of these two improvements allows me to measure the bare step scaling function in a region of the gauge coupling where it is clearly negative, indicating a positive renormalization group $\\beta$ function and infrared conformality.

  6. Finding Non-Zero Stable Fixed Points of the Weighted Kuramoto model is NP-hard

    E-print Network

    Richard Taylor

    2015-02-24

    The Kuramoto model when considered over the full space of phase angles [$0,2\\pi$) can have multiple stable fixed points which form basins of attraction in the solution space. In this paper we illustrate the fundamentally complex relationship between the network topology and the solution space by showing that determining the possibility of multiple stable fixed points from the network topology is NP-hard for the weighted Kuramoto Model. In the case of the unweighted model this problem is shown to be at least as difficult as a number partition problem, which we conjecture to be NP-hard. We conclude that it is unlikely that stable fixed points of the Kuramoto model can be characterized in terms of easily computable network invariants.

  7. Miniature Fixed-Point Cell Approaches for Monitoring of Thermocouple Stability

    NASA Astrophysics Data System (ADS)

    Failleau, G.; Elliott, C. J.; Deuzé, T.; Pearce, J. V.; Machin, G.; Sadli, M.

    2014-07-01

    In the framework of the European Metrology Research Project ENG08 "MetroFission," LNE-Cnam and NPL have undertaken cooperative research into the development of temperature measurement solutions for the next generation of nuclear fission power plants. Currently, in-pile temperature monitoring is usually performed with nickel-based (Type K or N) thermocouples. When these thermocouples are exposed to a neutron flux, the thermoelements transmute, leading to large and unknown drifts in output. In addition, it is impossible to routinely recalibrate the thermocouples after irradiation for obvious reasons of safety. To alleviate this problem, both LNE-Cnam and NPL have developed, via differing approaches, in situ calibration methods for the thermocouples. The self-validating thermocouple methodologies are based on the principle of a miniature fixed-point cell to be co-located with the thermocouple measurement junction in use. The drift of the thermocouple can be monitored and corrected for by regular determination of the output at the phase transition of the fixed-point material: in effect performing regular in situ calibration checks. The two institutes have constructed miniature fixed-point cells for use at three different temperatures; the freezing point of silver ; LNE-Cnam), the freezing point of copper ; LNE-Cnam and NPL), and the melting point of Fe-C (; NPL). This paper introduces the construction and validation of the miniature fixed-point cells prior to use, to ensure traceability to the ITS-90. A comparison of the performance of the two cell designs is discussed, where typical industrial Type N thermocouples have been used for measurement of the fixed-point cells. Such initial measurements demonstrate the feasibility of each of these two approaches.

  8. Reference in Action: Links between Pointing and Language

    ERIC Educational Resources Information Center

    Cooperrider, Kensy Andrew

    2011-01-01

    When referring to things in the world, speakers produce utterances that are composites of speech and action. Pointing gestures are a pervasive part of such composite utterances, but many questions remain about exactly how pointing is integrated with speech. In this dissertation I present three strands of research that investigate relations of…

  9. The four fixed points of scale invariant single field cosmological models

    SciTech Connect

    Xue, BingKan

    2012-10-01

    We introduce a new set of flow parameters to describe the time dependence of the equation of state and the speed of sound in single field cosmological models. A scale invariant power spectrum is produced if these flow parameters satisfy specific dynamical equations. We analyze the flow of these parameters and find four types of fixed points that encompass all known single field models. Moreover, near each fixed point we uncover new models where the scale invariance of the power spectrum relies on having simultaneously time varying speed of sound and equation of state. We describe several distinctive new models and discuss constraints from strong coupling and superluminality.

  10. A least-squares fixed-point iterative algorithm for multiple illumination photoacoustic tomography

    PubMed Central

    Harrison, Tyler; Shao, Peng; Zemp, Roger J.

    2013-01-01

    The optical absorption of tissues provides important information for clinical and pre-clinical studies. The challenge in recovering optical absorption from photoacoustic images is that the measured pressure depends on absorption and local fluence. One reconstruction approach uses a fixed-point iterative technique based on minimizing the mean-squared error combined with modeling of the light source to determine optical absorption. With this technique, convergence is not guaranteed even with an accurate measure of optical scattering. In this work we demonstrate using simulations that a new multiple illumination least squares fixed-point iteration algorithm improves convergence - even with poor estimates of optical scattering. PMID:24156078

  11. Parallel Fixed Point Implementation of a Radial Basis Function Network in an FPGA

    PubMed Central

    de Souza, Alisson C. D.; Fernandes, Marcelo A. C.

    2014-01-01

    This paper proposes a parallel fixed point radial basis function (RBF) artificial neural network (ANN), implemented in a field programmable gate array (FPGA) trained online with a least mean square (LMS) algorithm. The processing time and occupied area were analyzed for various fixed point formats. The problems of precision of the ANN response for nonlinear classification using the XOR gate and interpolation using the sine function were also analyzed in a hardware implementation. The entire project was developed using the System Generator platform (Xilinx), with a Virtex-6 xc6vcx240t-1ff1156 as the target FPGA. PMID:25268918

  12. On the Existence of Fixed Points for Q-Learning and Sarsa in Partially Observable Domains

    E-print Network

    Massachusetts at Amherst, University of

    , we show that such convergence problems can stem from discontinuous action selection strategies, such as softmax, then action- value and policy #12;xed points are guaranteed to exist. 1. Introduction policy evaluation and control tasks (Bertsekas & Tsit- siklis, 1996; Sutton & Barto, 1998). Even when val

  13. Some Issues Concerning Fixed Points in Computational Logic: QuasiMetrics, Multivalued Mappings and the

    E-print Network

    Hitzler, Pascal

    and the Knaster­Tarski Theorem \\Lambda Pascal Hitzler y and Anthony Karel Seda August 7, 2000 Department known versions, for mul­ tivalued mappings, of the Knaster­Tarski theorem and of the Banach contraction map­ ping theorem, and formulate a version of the classical fixed­point theorem (sometimes attributed

  14. ON SERIAL AND PARALLEL IMPLEMENTATIONS OF THE ERLANG FIXED POINT ITERATION SCHEME

    E-print Network

    Pollett, Phil

    ON SERIAL AND PARALLEL IMPLEMENTATIONS OF THE ERLANG FIXED POINT ITERATION SCHEME Andrew G Hart of the weighting constant. Finally, a comparison between the serial implementation and a number of parallel, including cellular and mobile radio networks, database management systems, computer networks and circuit

  15. On the Movement of Vertex Fixed Points in the Simple GA Alden H. Wright

    E-print Network

    Gedeon, Tomas

    system model of the simple genetic algo- rithm models the behavior of this algorithm for large popu population model As the name suggests, the infinite population model (IPM) of the simple genetic algorithm and changes in the crossover rate. Keywords Genetic Algorithms, Theory, Crossover, Fixed Points 1

  16. EA Models and Population Fixed-Points Versus Mutation Rates for Functions of Unitation

    E-print Network

    Wright, Alden H.

    @cs.umt.edu ABSTRACT Using a dynamic systems model for the Simple Genetic Algorithm due to Vose[1], we analyze theory of evolutionary algorithms, infinite population models, unitation functions, fixed points, genetic algorithms. 1. INTRODUCTION The Vose infinite population model [1] of simple genetic algorithms is a dynamic

  17. The log-concavity conjecture on semifree symplectic S^1-manifolds with isolated fixed points

    E-print Network

    Yunhyung Cho

    2011-11-30

    Let $(M,\\omega)$ be a closed $2n$-dimensional semifree Hamiltonian $S^1$-manifold with only isolated fixed points. We prove that a density function of the Duistermaat-Heckman measure is log-concave. Moreover, we prove that $(M,\\omega)$ and any reduced symplectic form satisfy the Hard Lefschetz property.

  18. J. fixed point theory appl. Online First c 2008 Birkhauser Verlag Basel/Switzerland

    E-print Network

    Tabachnikov, Sergei

    J. fixed point theory appl. Online First c 2008 Birkh¨auser Verlag Basel/Switzerland DOI 10.1007/s then there exists an orientation preserving diffeomorphism of S1 that takes f to a function L2 -orthogonal to V . We then there exists an orientation preserving diffeomorphism of RP1 that takes f to the Schwarzian derivative

  19. Gradient flow and IR fixed point in SU(2) with Nf=8 flavors

    E-print Network

    Leino, Viljami; Rantaharju, Jarno; Rantalaiho, Teemu; Rummukainen, Kari; Suorsa, Joni M; Tuominen, Kimmo

    2015-01-01

    We study the running of the coupling in SU(2) gauge theory with 8 massless fundamental representation fermion flavours, using the gradient flow method with the Schr\\"odinger functional boundary conditions. Gradient flow allows us to measure robust continuum limit for the step scaling function. The results show a clear indication of infrared fixed point consistent with perturbation theory.

  20. Gradient flow and IR fixed point in SU(2) with Nf=8 flavors

    E-print Network

    Viljami Leino; Tuomas Karavirta; Jarno Rantaharju; Teemu Rantalaiho; Kari Rummukainen; Joni M. Suorsa; Kimmo Tuominen

    2015-11-11

    We study the running of the coupling in SU(2) gauge theory with 8 massless fundamental representation fermion flavours, using the gradient flow method with the Schr\\"odinger functional boundary conditions. Gradient flow allows us to measure robust continuum limit for the step scaling function. The results show a clear indication of infrared fixed point consistent with perturbation theory.

  1. APMP Scale Comparison with Three Radiation Thermometers and Six Fixed-Point Blackbodies

    NASA Astrophysics Data System (ADS)

    Yamada, Y.; Shimizu, Y.; Ishii, J.

    2015-08-01

    New Asia Pacific Metrology Programme (APMP) comparisons of radiation thermometry standards, APMP TS-11, and -12, have recently been initiated. These new APMP comparisons cover the temperature range from to . Three radiation thermometers with central wavelengths of 1.6 , 0.9 , and 0.65 are the transfer devices for the radiation thermometer scale comparison conducted in the so-called star configuration. In parallel, a compact fixed-point blackbody furnace that houses six types of fixed-point cells of In, Sn, Zn, Al, Ag, and Cu is circulated, again in a star-type comparison, to substantiate fixed-point calibration capabilities. Twelve APMP national metrology institutes are taking part in this endeavor, in which the National Metrology Institute of Japan acts as the pilot. In this article, the comparison scheme is described with emphasis on the features of the transfer devices, i.e., the radiation thermometers and the fixed-point blackbodies. Results of preliminary evaluations of the performance and characteristic of these instruments as well as the evaluation method of the comparison results are presented.

  2. User-Equilibrium Properties of Fixed Points in Dynamic Traffic Assignment

    E-print Network

    Smith, Robert L.

    User-Equilibrium Properties of Fixed Points in Dynamic Traffic Assignment David E. Kaufman AT Abstract This paper considers the problem of dynamic traffic assignment under the princi- ple 755, Washington, DC 20024 1 #12;1 Introduction An assignment of flow in a traffic network is described

  3. Long-Term Stability of WC-C Peritectic Fixed Point

    NASA Astrophysics Data System (ADS)

    Khlevnoy, B. B.; Grigoryeva, I. A.

    2015-03-01

    The tungsten carbide-carbon peritectic (WC-C) melting transition is an attractive high-temperature fixed point with a temperature of . Earlier investigations showed high repeatability, small melting range, low sensitivity to impurities, and robustness of WC-C that makes it a prospective candidate for the highest fixed point of the temperature scale. This paper presents further study of the fixed point, namely the investigation of the long-term stability of the WC-C melting temperature. For this purpose, a new WC-C cell of the blackbody type was built using tungsten powder of 99.999 % purity. The stability of the cell was investigated during the cell aging for 50 h at the cell working temperature that tooks 140 melting/freezing cycles. The method of investigation was based on the comparison of the WC-C tested cell with a reference Re-C fixed-point cell that reduces an influence of the probable instability of a radiation thermometer. It was shown that after the aging period, the deviation of the WC-C cell melting temperature was with an uncertainty of.

  4. Conformal Bootstrap Approach to O(N) Fixed Points in Five Dimensions

    E-print Network

    Jin-Beom Bae; Soo-Jong Rey

    2014-12-19

    Whether O(N)-invariant conformal field theory exists in five dimensions with its implication to higher-spin holography was much debated. We find an affirmative result on this question by utilizing conformal bootstrap approach. In solving for the crossing symmetry condition, we propose a new approach based on specification for the low-lying spectrum distribution. We find the traditional one-gap bootstrapping is not suited since the nontrivial fixed point expected from large-N expansion sits at deep interior (not at boundary or kink) of allowed solution region. We propose two-gap bootstrapping that specifies scaling dimension of two lowest scalar operators. The approach carves out vast region of lower scaling dimensions and universally features two tips. We find that the sought-for nontrivial fixed point now sits at one of the tips, while the Gaussian fixed point sits at the other tip. The scaling dimensions of scalar operators fit well with expectation based on large-N expansion. We also find indication that the fixed point persist for lower values of N all the way down to N=1. This suggests that interacting unitary conformal field theory exists in five dimensions for all nonzero N.

  5. A FIXED POINT THEOREM FOR STRONGER ASSOCIATION RULES AND ITS COMPUTATIONAL ASPECTS

    E-print Network

    Czédli, Gábor

    July 15, 2008. Key words and phrases. Association rule, database, data mining, lattice, poset, contextA FIXED POINT THEOREM FOR STRONGER ASSOCIATION RULES AND ITS COMPUTATIONAL ASPECTS G´ABOR CZ´EDLI Abstract. Each relation induces a new closure operator, which is (in the sense of data mining) stronger

  6. ON GUPTA-BELNAP REVISION THEORIES OF TRUTH, KRIPKEAN FIXED POINTS, AND THE NEXT STABLE SET.

    E-print Network

    Welch, Philip

    ON GUPTA-BELNAP REVISION THEORIES OF TRUTH, KRIPKEAN FIXED POINTS, AND THE NEXT STABLE SET. P.D.WELCH Abstract. We consider various concepts associated with the revision theory of truth of Gupta and Belnap. We categorize the notions definable using their theory of circular definitions as those notions universally

  7. QUASICONFORMAL HOMOGENEITY OF HYPERBOLIC SURFACES WITH FIXED-POINT FULL AUTOMORPHISMS

    E-print Network

    Canary, Dick

    , MARTIN BRIDGEMAN, RICHARD D. CANARY, AND EDWARD C. TAYLOR Abstract. We show that any closed hyperbolic in part by NSF grant 0305704. 1 #12;2 P. BONFERT-TAYLOR, M. BRIDGEMAN, R.D. CANARY, E.C. TAYLOR We alsoQUASICONFORMAL HOMOGENEITY OF HYPERBOLIC SURFACES WITH FIXED-POINT FULL AUTOMORPHISMS PETRA BONFERT-TAYLOR

  8. A fixed point formula of Lefschetz type in Arakelov geometry III: representations of

    E-print Network

    Köhler, Kai

    the weight space to the weight µ in the cohomology representation, then the classical Lefschetz formulaA fixed point formula of Lefschetz type in Arakelov geometry III: representations of Chevalley a new proof of the Jantzen sum formula for integral repre- sentations of Chevalley schemes over Spec Z

  9. A fixed point formula of Lefschetz type in Arakelov geometry III: representations of

    E-print Network

    Köhler, Kai

    to the weight ~ in the cohomologyPrepresentation, then the classical Lefschetz formula computes the character A fixed point formula of Lefschetz type in Arakelov geometry III: representations We give a new proof of the Jantzen sum formula for integral repre- sentations of Chevalley

  10. 6th Workshop on Fixed Points in Computer Science Coimbra, Portugal, 12-13 September 2009

    E-print Network

    Rutten, Jan

    6th Workshop on Fixed Points in Computer Science FICS 2009 Coimbra, Portugal, 12-13 September 2009 in Computer Science FICS 2009 Coimbra, Portugal, 12­13 September 2009 Proceedings Institute of Cybernetics 2009 Coimbra, Portugal, 12­13 September 2009 Proceedings Edited by Ralph Matthes and Tarmo Uustalu

  11. Intermediate fixed point in a Luttinger liquid with elastic and dissipative backscattering

    NASA Astrophysics Data System (ADS)

    Altland, Alexander; Gefen, Yuval; Rosenow, Bernd

    2015-08-01

    In a recent work [A. Altland, Y. Gefen, and B. Rosenow, Phys. Rev. Lett. 108, 136401 (2012), 10.1103/PhysRevLett.108.136401], we have addressed the problem of a Luttinger liquid with a scatterer that allows for both coherent and incoherent scattering channels. We have found that the physics associated with this model is qualitatively different from the elastic impurity setup analyzed by Kane and Fisher, and from the inelastic scattering scenario studied by Furusaki and Matveev, thus proposing a paradigmatic picture of Luttinger liquid with an impurity. Here we present an extensive study of the renormalization group flows for this problem, the fixed point landscape, and scaling near those fixed points. Our analysis is nonperturbative in the elastic tunneling amplitudes, employing an instanton calculation in one or two of the available elastic tunneling channels. Our analysis accounts for nontrivial Klein factors, which represent anyonic or fermionic statistics. These Klein factors need to be taken into account due to the fact that higher-order tunneling processes take place. In particular, we find a stable fixed point, where an incoming current is split 1/2 -1/2 between a forward and a backward scattered beams. This intermediate fixed point, between complete backscattering and full forward scattering, is stable for the Luttinger parameter g <1 .

  12. Combined GPS/GLONASS Precise Point Positioning with Fixed GPS Ambiguities

    PubMed Central

    Pan, Lin; Cai, Changsheng; Santerre, Rock; Zhu, Jianjun

    2014-01-01

    Precise point positioning (PPP) technology is mostly implemented with an ambiguity-float solution. Its performance may be further improved by performing ambiguity-fixed resolution. Currently, the PPP integer ambiguity resolutions (IARs) are mainly based on GPS-only measurements. The integration of GPS and GLONASS can speed up the convergence and increase the accuracy of float ambiguity estimates, which contributes to enhancing the success rate and reliability of fixing ambiguities. This paper presents an approach of combined GPS/GLONASS PPP with fixed GPS ambiguities (GGPPP-FGA) in which GPS ambiguities are fixed into integers, while all GLONASS ambiguities are kept as float values. An improved minimum constellation method (MCM) is proposed to enhance the efficiency of GPS ambiguity fixing. Datasets from 20 globally distributed stations on two consecutive days are employed to investigate the performance of the GGPPP-FGA, including the positioning accuracy, convergence time and the time to first fix (TTFF). All datasets are processed for a time span of three hours in three scenarios, i.e., the GPS ambiguity-float solution, the GPS ambiguity-fixed resolution and the GGPPP-FGA resolution. The results indicate that the performance of the GPS ambiguity-fixed resolutions is significantly better than that of the GPS ambiguity-float solutions. In addition, the GGPPP-FGA improves the positioning accuracy by 38%, 25% and 44% and reduces the convergence time by 36%, 36% and 29% in the east, north and up coordinate components over the GPS-only ambiguity-fixed resolutions, respectively. Moreover, the TTFF is reduced by 27% after adding GLONASS observations. Wilcoxon rank sum tests and chi-square two-sample tests are made to examine the significance of the improvement on the positioning accuracy, convergence time and TTFF. PMID:25237901

  13. Searching for fixed point combinators by using automated theorem proving: A preliminary report

    SciTech Connect

    Wos, L.; McCune, W.

    1988-09-01

    In this report, we establish that the use of an automated theorem- proving program to study deep questions from mathematics and logic is indeed an excellent move. Among such problems, we focus mainly on that concerning the construction of fixed point combinators---a problem considered by logicians to be significant and difficult to solve, and often computationally intensive and arduous. To be a fixed point combinator, THETA must satisfy the equation THETAx = x(THETAx) for all combinators x. The specific questions on which we focus most heavily ask, for each chosen set of combinators, whether a fixed point combinator can be constructed from the members of that set. For answering questions of this type, we present a new, sound, and efficient method, called the kernel method, which can be applied quite easily by hand and very easily by an automated theorem-proving program. For the application of the kernel method by a theorem-proving program, we illustrate the vital role that is played by both paramodulation and demodulation---two of the powerful features frequently offered by an automated theorem-proving program for treating equality as if it is ''understood.'' We also state a conjecture that, if proved, establishes the completeness of the kernel method. From what we can ascertain, this method---which relies on the introduced concepts of kernel and superkernel---offers the first systematic approach for searching for fixed point combinators. We successfully apply the new kernel method to various sets of combinators and, for the set consisting of the combinators B and W, construct an infinite set of fixed point combinators such that no two of the combinators are equal even in the presence of extensionality---a law that asserts that two combinators are equal if they behave the same. 18 refs.

  14. Synthetic foundations of cevian geometry, I: Fixed points of affine maps in triangle geometry

    E-print Network

    Igor Minevich; Patrick Morton

    2015-03-29

    We give synthetic proofs of many new results in triangle geometry, focusing especially on fixed points of certain affine maps which are defined in terms of the cevian triangle $DEF$ of a point $P$ with respect to a given triangle $ABC$, as well as the cevian triangle of the isotomic conjugate $P'$ of $P$ with respect to $ABC$. We prove a formula for the cyclocevian map in terms of the isotomic and isogonal maps using an entirely synthetic argument, and show that the complement $Q$ of the isotomic conjugate $P'$ has many interesting properties. If $T_P$ is the affine map taking $ABC$ to $DEF$, we show synthetically that $Q$ is the unique ordinary fixed point of $T_P$ when $P$ is any point not lying on the sides of triangle $ABC$, its anti-complementary triangle, or the Steiner circumellipse of $ABC$. We also show that $T_P(Q')=P$ if $Q'$ is the complement of $P$, and that the affine map $T_P T_{P'}$ is either a homothety or a translation which always has the $P$-ceva conjugate of $Q$ as a fixed point. Finally, we show that $P$ lies on the Steiner circumellipse if and only if $T_PT_{P'}=K^{-1}$, where $K$ is the complement map for $ABC$. This paper forms the foundation for several more papers to follow, in which the conic on the 5 points $A,B,C,P,Q$ is studied and its center is characterized as a fixed point of the map $\\lambda=T_{P'} T_P^{-1}$.

  15. An Exact Holographic RG Flow Between 2d Conformal Fixed Points

    E-print Network

    Marcus Berg; Henning Samtleben

    2002-01-19

    We describe a supersymmetric RG flow between conformal fixed points of a two-dimensional quantum field theory as an analytic domain wall solution of the three-dimensional SO(4) x SO(4) gauged supergravity. Its ultraviolet fixed point is an N=(4,4) superconformal field theory related, through the double D1-D5 system, to theories modeling the statistical mechanics of black holes. The flow is driven by a relevant operator of conformal dimension \\Delta=3/2 which breaks conformal symmetry and breaks supersymmetry down to N=(1,1), and sends the theory to an infrared conformal fixed point with half the central charge. Using the supergravity description, we compute counterterms, one-point functions and fluctuation equations for inert scalars and vector fields, providing the complete framework to compute two-point correlation functions of the corresponding operators throughout the flow in the two-dimensional quantum field theory. This produces a toy model for flows of N=4 super Yang-Mills theory in 3+1 dimensions, where conformal-to-conformal flows have resisted analytical solution.

  16. Evaluation and Selection of High-Temperature Fixed-Point Cells for Thermodynamic Temperature Assignment

    NASA Astrophysics Data System (ADS)

    Yamada, Y.; Anhalt, K.; Battuello, M.; Bloembergen, P.; Khlevnoy, B.; Machin, G.; Matveyev, M.; Sadli, M.; Todd, A.; Wang, T.

    2015-08-01

    A multi-partner project to determine the thermodynamic temperatures of a selected set of high-temperature fixed points based on metal-carbon eutectics is underway as a working group activity within the Comité International des Poids et Mesures. The investigation focuses on four fixed-point types, namely, the three metal-carbon eutectic points of Re-C , Pt-C , and Co-C , and the Cu point . This paper describes the construction, pre-evaluation, and screening stage of the cells prior to their thermodynamic temperature determinations. The construction of the HTFP cells was undertaken by nine national metrology institutes (NMIs) according to instructions laid out in a pre-agreed protocol that ensures production of best quality cells. Four NMIs conducted the evaluation, each for a certain fixed-point type, and screened out cells that did not meet pre-determined selection criteria while assuring sufficient variety in the sources of the cells in the final selected sets. In autumn 2012, the selected cells were successfully passed on to the final stage of the project, the thermodynamic temperature measurement, and assignment.

  17. Non-Fermi liquid fixed point in a Wilsonian theory of quantum critical metals

    E-print Network

    A. Liam Fitzpatrick; Shamit Kachru; Jared Kaplan; S. Raghu

    2013-09-10

    We study the problem of disorder-free metals near a continuous quantum critical point. We depart from the standard paradigm of Hertz and Millis, and treat both fermions and bosons i.e. order parameter fields) on equal footing. We construct a Wilsonian effective field theory that integrates out only high energy boson and fermion modes. Below the upper critical dimension of the theory (d=3 spatial dimensions), we find new fixed points in which the bosons are described by the Wilson-Fisher fixed point and are coupled to a non-Fermi liquid metal. We describe subtleties with the renormalization group flow of four-Fermi interactions, which can be surmounted in a controlled large N limit. In this limit, we find that the theory has no superconducting instability.

  18. An index-resolved fixed-point homotopy and potential energy landscapes

    E-print Network

    Tianran Chen; Dhagash Mehta

    2015-04-24

    Stationary points (SPs) of the potential energy landscapes can be classified by their Morse index, i.e., the number of negative eigenvalues of the Hessian evaluated at the SPs. In understanding chemical clusters through their potential energy landscapes, only SPs of a particular Morse index are needed. We propose a modification of the "fixed-point homotopy" method which can be used to directly target stationary points of a specified Morse index. We demonstrate the effectiveness of our approach by applying it to the Lennard-Jones clusters.

  19. Bilateral ITS-90 comparison at WC-C peritectic fixed point between NIM and NPL

    NASA Astrophysics Data System (ADS)

    Dong, W.; Lowe, D. H.; Lu, X.; Machin, G.; Yuan, Z.; Wang, T.; Bloembergen, P.; Xiao, C.

    2013-09-01

    The WC-C peritectic fixed point, nominal melting and freezing temperature 2747 °C, shows extremely good metrological potential. Elsewhere, we published a prototype scale comparison of the ITS-90 between NPL, NIM and CEM, using high temperature eutectic fixed points (HTFPs) of Co-C (1324 °C), Pt-C (1738 °C), and Re-C (2474 °C). In this paper we present the further results of the bilateral comparison of the ITS-90 at an even higher temperature, 2747 °C, between NIM and NPL using WC-C peritectic fixed points. A NIM single zone high temperature furnace, model Chino IR-80, was modified to extend its temperature to 2800 °C. Then, an NPL researcher, on secondment to NIM, filled two WC-C cells in the modified furnace in a vertical position. The two WC-C cells were then realized in the same furnace, in an horizontal position. Their melting temperatures, defined by the inflection point of the melting curves, were measured by a linear pyrometer, model NIM-PSP. NIM's ITS-90 scale was assigned to the two cells, which were then transported to NPL. The realization of NPL's ITS-90 was then assigned to the two cells by using a model HT9500 Thermogauge furnace to realize the fixed points and a linear pyrometer, model LP3, to determine their temperature. The difference from the mean value of the NIM and NPL ITS-90 values for the WC-C points was derived. This allowed us to compare ITS-90 as realized by the two institutes and to determine the uncertainty in the scale comparison.

  20. Fully developed isotropic turbulence: nonperturbative renormalization group formalism and fixed point solution

    E-print Network

    Léonie Canet; Bertrand Delamotte; Nicolás Wschebor

    2014-11-28

    We investigate the regime of fully developed homogeneous turbulence of the Navier-Stokes (NS) equation in the presence of a stochastic forcing. Using the nonperturbative (functional) version of the renormalization group (NPRG), we avoid all the difficulties that plague standard RG approaches to NS turbulence and have hindered real progress in the calculation of multi-scaling. We obtain the fixed point solution of the NPRG flow equations, which corresponds to fully developed turbulence, in $d=2$ and $d=3$ dimensions. The striking feature of this fixed point is that it does not entail the usual scale invariance, because of the absence of a regular limit when the integral scale (the typical length scale of energy injection) tends to infinity. We indeed show, on the basis of exact flow equations in the large wave-number limit, how violations to the Kolmogorov scaling can emerge, leaving the accurate determination of the ensuing intermittent exponents for future work.

  1. Fixed-Point Quantum Search with an Optimal Number of Queries

    NASA Astrophysics Data System (ADS)

    Yoder, Theodore J.; Low, Guang Hao; Chuang, Isaac L.

    2014-11-01

    Grover's quantum search and its generalization, quantum amplitude amplification, provide a quadratic advantage over classical algorithms for a diverse set of tasks but are tricky to use without knowing beforehand what fraction ? of the initial state is comprised of the target states. In contrast, fixed-point search algorithms need only a reliable lower bound on this fraction but, as a consequence, lose the very quadratic advantage that makes Grover's algorithm so appealing. Here we provide the first version of amplitude amplification that achieves fixed-point behavior without sacrificing the quantum speedup. Our result incorporates an adjustable bound on the failure probability and, for a given number of oracle queries, guarantees that this bound is satisfied over the broadest possible range of ? .

  2. Fixed-point quantum search with an optimal number of queries.

    PubMed

    Yoder, Theodore J; Low, Guang Hao; Chuang, Isaac L

    2014-11-21

    Grover's quantum search and its generalization, quantum amplitude amplification, provide a quadratic advantage over classical algorithms for a diverse set of tasks but are tricky to use without knowing beforehand what fraction ? of the initial state is comprised of the target states. In contrast, fixed-point search algorithms need only a reliable lower bound on this fraction but, as a consequence, lose the very quadratic advantage that makes Grover's algorithm so appealing. Here we provide the first version of amplitude amplification that achieves fixed-point behavior without sacrificing the quantum speedup. Our result incorporates an adjustable bound on the failure probability and, for a given number of oracle queries, guarantees that this bound is satisfied over the broadest possible range of ?. PMID:25479481

  3. Fixed point theory and semidefinite programming for computable performance analysis of block-sparsity recovery

    E-print Network

    Tang, Gongguo

    2011-01-01

    In this paper, we employ fixed point theory and semidefinite programming to compute the performance bounds on convex block-sparsity recovery algorithms. As a prerequisite for optimal sensing matrix design, a computable performance bound would open doors for wide applications in sensor arrays, radar, DNA microarrays, and many other areas where block-sparsity arises naturally. We define a family of goodness measures for arbitrary sensing matrices as the optimal values of certain optimization problems. The reconstruction errors of convex recovery algorithms are bounded in terms of these goodness measures. We demonstrate that as long as the number of measurements is relatively large, these goodness measures are bounded away from zero for a large class of random sensing matrices, a result parallel to the probabilistic analysis of the block restricted isometry property. As the primary contribution of this work, we associate the goodness measures with the fixed points of functions defined by a series of semidefinite...

  4. Bifurcation from stable fixed point to N-dimensional attractor in the border collision normal form

    NASA Astrophysics Data System (ADS)

    Glendinning, Paul

    2015-10-01

    The N-dimensional border collision normal form describes bifurcations of piecewise smooth systems. It is shown that there is an open set of parameters such that on one side of the bifurcation the map has a stable fixed point and on the other an attractor with Hausdorff dimension N. For generic parameters this attractor contains open sets and hence has topological dimension equal to N.

  5. 5d fixed points from brane webs and O7-planes

    E-print Network

    Bergman, Oren

    2015-01-01

    We explore the properties of five-dimensional supersymmetric gauge theories living on 5-brane webs in orientifold 7-plane backgrounds. These include $USp(2N)$ and $SO(N)$ gauge theories with fundamental matter, as well as $SU(N)$ gauge theories with symmetric and antisymmetric matter. We find a number of new 5d fixed point theories that feature enhanced global symmetries. We also exhibit a number of new 5d dualities.

  6. 5d fixed points from brane webs and O7-planes

    E-print Network

    Oren Bergman; Gabi Zafrir

    2015-08-15

    We explore the properties of five-dimensional supersymmetric gauge theories living on 5-brane webs in orientifold 7-plane backgrounds. These include $USp(2N)$ and $SO(N)$ gauge theories with fundamental matter, as well as $SU(N)$ gauge theories with symmetric and antisymmetric matter. We find a number of new 5d fixed point theories that feature enhanced global symmetries. We also exhibit a number of new 5d dualities.

  7. Perturbed pendulum-like motions of a rigid body about a fixed point

    E-print Network

    Igor N. Gashenenko

    2012-12-09

    This paper is devoted to a detailed investigation of the perturbed pendulum-like motions of a heavy rigid body about a fixed point. Canonical variables that allow one to simplify the analysis of homoclinic and heteroclinic orbits are introduced. Characteristic properties of perturbed pendulum-like motions of the body in inertial space are studied. A qualitative description of asymptotics of pendulum-like motions in a neighbourhood of split separatrices is given.

  8. Video-Based Point Cloud Generation Using Multiple Action Cameras

    NASA Astrophysics Data System (ADS)

    Teo, T.

    2015-05-01

    Due to the development of action cameras, the use of video technology for collecting geo-spatial data becomes an important trend. The objective of this study is to compare the image-mode and video-mode of multiple action cameras for 3D point clouds generation. Frame images are acquired from discrete camera stations while videos are taken from continuous trajectories. The proposed method includes five major parts: (1) camera calibration, (2) video conversion and alignment, (3) orientation modelling, (4) dense matching, and (5) evaluation. As the action cameras usually have large FOV in wide viewing mode, camera calibration plays an important role to calibrate the effect of lens distortion before image matching. Once the camera has been calibrated, the author use these action cameras to take video in an indoor environment. The videos are further converted into multiple frame images based on the frame rates. In order to overcome the time synchronous issues in between videos from different viewpoints, an additional timer APP is used to determine the time shift factor between cameras in time alignment. A structure form motion (SfM) technique is utilized to obtain the image orientations. Then, semi-global matching (SGM) algorithm is adopted to obtain dense 3D point clouds. The preliminary results indicated that the 3D points from 4K video are similar to 12MP images, but the data acquisition performance of 4K video is more efficient than 12MP digital images.

  9. New Experimental Technique for the Study of Phase Transition Evolution in Fixed-Point Cells

    NASA Astrophysics Data System (ADS)

    Nemeth, T.; Nemeth, S.; Turzo-Andras, E.

    2015-08-01

    A new advanced technique was developed at the Hungarian Metrological Institute (MKEH), devoted to optimizing the realization of the International Temperature Scale ITS-90. The work was performed within the framework of the European project "Novel techniques for traceable temperature dissemination." The paper is devoted to describing this new measurement technique and its setup. The time evolution of the solid fraction and melt fraction along the phase transformation has been followed, using a technique based on the difference of the electrical conductivity between the solid and liquid phases of the metal. The measurement technique provides electrical signals, which are suitable for improving the quality of the freezing plateaus realized in the case of different fixed-point realizations, covering the temperature range from to . The ideal section of the freezing plateau can be maintained by ensuring a continuous flow of mass and energy of the fixed-point substance in the axial direction. The intervention is achieved by modifying the temperatures of the different zones of the furnace controller with more degrees, with the aid of developed intervening devices. Recent developments permit the selection of the ideal section of a freezing plateau and, what is more, the increase of this plateau section to practically unlimited for all metal fixed points.

  10. High order fixed-point sweeping WENO methods for steady state of hyperbolic conservation laws and its convergence study

    E-print Network

    Shu, Chi-Wang

    High order fixed-point sweeping WENO methods for steady state of hyperbolic conservation laws on the recently devel- oped fifth order WENO schemes which improve the convergence of the classical WENO schemes by removing slight post-shock oscillations, we design fifth order fixed-point sweeping WENO methods

  11. Global fixed-point proof of time-dependent density-functional theory

    NASA Astrophysics Data System (ADS)

    Ruggenthaler, M.; van Leeuwen, R.

    2011-07-01

    We reformulate the uniqueness and existence proofs of time-dependent density-functional theory. The central idea is to restate the fundamental one-to-one correspondence between densities and potentials as a global fixed-point question for potentials on a given time interval. We show that the unique fixed point, i.e. the unique potential generating a given density, is reached as the limiting point of an iterative procedure. The one-to-one correspondence between densities and potentials is a straightforward result provided that the response function of the divergence of the internal forces is bounded. The existence, i.e. the v-representability of a density, can be proven as well provided that the operator norms of the response functions of the members of the iterative sequence of potentials have an upper bound. The densities under consideration have second time-derivatives that are required to satisfy a condition slightly weaker than being square-integrable. This approach avoids the usual restrictions of Taylor-expandability in time of the uniqueness theorem by Runge and Gross (Phys. Rev. Lett., 52 (1984) 997) and of the existence theorem by van Leeuwen (Phys. Rev. Lett., 82 (1999) 3863). Owing to its generality, the proof not only answers basic questions in density-functional theory but also has potential implications in other fields of physics.

  12. Search for the IR fixed point in the twisted Polyakov loop scheme

    E-print Network

    Erek Bilgici; Antonino Flachi; Etsuko Itou; Masafumi Kurachi; C. -J. David Lin; Hideo Matsufuru; Hiroshi Ohki; Tetsuya Onogi; Eigo Shintani; Takeshi Yamazaki

    2009-10-21

    We present a non-perturbative study of the running coupling constant in the Twisted Polyakov Loop (TPL) scheme. We investigate how the systematic and statistical errors can be controlled {\\it via} a feasibility study in SU(3) pure Yang-Mills theory. We show that our method reproduces the perturbative determination of the running coupling in the UV. In addition, our numerical result agrees with the theoretical prediction of this coupling constant in the IR. We also present our preliminary results for $N_f=12$ QCD, where an IR fixed point may be present.

  13. Search for the IR fixed point in the Twisted Polyakov Loop scheme (II)

    E-print Network

    Etsuko Itou; Tatsumi Aoyama; Masafumi Kurachi; C. -J. David Lin; Hideo Matsufuru; Hiroshi Ohki; Tetsuya Onogi; Eigo Shintani; Takeshi Yamazaki

    2010-11-02

    We measure the renormalized coupling in the Twisted Polyakov loop scheme for SU(3) gauge theory coupled with $N_f=12$ fundamental fermions. To find the infrared fixed point of this theory, we focus on the step scaling function for the renormalized coupling. We take the continuum limit using the linear function of $(a/L)^2$ and a constant fit function. We find that there is a sizeable systematic error due to the choice of the continuum extrapolation function in the low energy region. We will give some directions to reduce the systematic errors.

  14. Uncertainty due to non-linearity in radiation thermometers calibrated by multiple fixed points

    SciTech Connect

    Yamaguchi, Y.; Yamada, Y.

    2013-09-11

    A new method to estimate the uncertainty due to non-linearity is described on the n= 3 scheme basis. The expression of uncertainty is mathematically derived applying the random walk method. The expression is simple and requires only the temperatures of the fixed points and a relative uncertainty value for each flux-doubling derived from the non-linearity measurement. We also present an example of the method, in which the uncertainty of temperature measurement by a radiation thermometer is calculated on the basis of non-linearity measurement.

  15. $?I=1/2$ rule for kaon decays derived from QCD infrared fixed point

    E-print Network

    R. J. Crewther; Lewis C. Tunstall

    2015-02-24

    This article gives details of our proposal to replace ordinary chiral $SU(3)_L\\times SU(3)_R$ perturbation theory $\\chi$PT$_3$ by 3-flavor chiral-scale perturbation theory $\\chi$PT$_\\sigma$. In $\\chi$PT$_\\sigma$, amplitudes are expanded at low energies and small $u,d,s$ quark masses about an infrared fixed point $\\alpha^{}_\\mathrm{IR}$ of 3-flavor QCD. At $\\alpha^{}_\\mathrm{IR}$, the quark condensate $\\langle \\bar{q}q\\rangle_{\\mathrm{vac}} \

  16. Finiteness of fixed equilibrium configurations of point vortices in the plane with a background flow

    NASA Astrophysics Data System (ADS)

    Cheung, Pak-Leong; Ng, Tuen Wai

    2014-10-01

    For a dynamic system consisting of n point vortices in an ideal plane fluid with a steady, incompressible and irrotational background flow, a more physically significant definition of a fixed equilibrium configuration is suggested. Under this new definition, if the complex polynomial w that determines the aforesaid background flow is non-constant, we have found an attainable generic upper bound \\frac{(m+n-1)!}{(m-1)!\\,n_1!\\cdots n_{i_0}!} for the number of fixed equilibrium configurations. Here, m = deg w, i0 is the number of species, and each ni is the number of vortices in a species. We transform the rational function system arising from fixed equilibria into a polynomial system, whose form is good enough to apply the BKK theory (named after Bernshtein (1975 Funct. Anal. Appl. 9 183-5), Khovanskii (1978 Funct. Anal. Appl. 12 38-46) and Kushnirenko (1976 Funct. Anal. Appl. 10 233-5)) to show the finiteness of its number of solutions. Having this finiteness, the required bound follows from Bézout's theorem or the BKK root count by Li and Wang (1996 Math. Comput. 65 1477-84).

  17. Development of a new radiometer for the thermodynamic measurement of high temperature fixed points

    SciTech Connect

    Dury, M. R.; Goodman, T. M.; Lowe, D. H.; Machin, G.; Woolliams, E. R.

    2013-09-11

    The National Physical Laboratory (NPL) has developed a new radiometer to measure the thermodynamic melting point temperatures of high temperature fixed points with ultra-low uncertainties. In comparison with the NPL's Absolute Radiation Thermometer (ART), the 'THermodynamic Optical Radiometer' (THOR) is more portable and compact, with a much lower size-of-source effect and improved performance in other parameters such as temperature sensitivity. It has been designed for calibration as a whole instrument via the radiance method, removing the need to calibrate the individual subcomponents, as required by ART, and thereby reducing uncertainties. In addition, the calibration approach has been improved through a new integrating sphere that has been designed to have greater uniformity.

  18. Infrared cameras are potential traceable "fixed points" for future thermometry studies.

    PubMed

    Yap Kannan, R; Keresztes, K; Hussain, S; Coats, T J; Bown, M J

    2015-11-01

    The National physical laboratory (NPL) requires "fixed points" whose temperatures have been established by the International Temperature Scale of 1990 (ITS 90) be used for device calibration. In practice, "near" blackbody radiators together with the standard platinum resistance thermometer is accepted as a standard. The aim of this study was to report the correlation and limits of agreement (LOA) of the thermal infrared camera and non-contact infrared temporal thermometer against each other and the "near" blackbody radiator. Temperature readings from an infrared thermography camera (FLIR T650sc) and a non-contact infrared temporal thermometer (Hubdic FS-700) were compared to a near blackbody (Hyperion R blackbody model 982) at 0.5?°C increments between 20-40?°C. At each increment, blackbody cavity temperature was confirmed with the platinum resistance thermometer. Measurements were taken initially with the thermal infrared camera followed by the infrared thermometer, with each device mounted in turn on a stand at a fixed distance of 20?cm and 5?cm from the blackbody aperture, respectively. The platinum thermometer under-estimated the blackbody temperature by 0.015?°C (95% LOA: -0.08?°C to 0.05?°C), in contrast to the thermal infrared camera and infrared thermometer which over-estimated the blackbody temperature by 0.16?°C (95% LOA: 0.03?°C to 0.28?°C) and 0.75?°C (95% LOA: -0.30?°C to 1.79?°C), respectively. Infrared thermometer over-estimates thermal infrared camera measurements by 0.6?°C (95% LOA: -0.46?°C to 1.65?°C). In conclusion, the thermal infrared camera is a potential temperature reference "fixed point" that could substitute mercury thermometers. However, further repeatability and reproducibility studies will be required with different models of thermal infrared cameras. PMID:26468981

  19. Use of Eutectic Fixed Points to Characterize a Spectrometer for Earth Observations

    NASA Astrophysics Data System (ADS)

    Salim, Saber G. R.; Fox, Nigel P.; Woolliams, Emma R.; Winkler, Rainer; Pegrum, Heather M.; Sun, Tong; Grattan, Ken T. V.

    2007-12-01

    A small palm-sized, reference spectrometer, mounted on a remote-controlled model helicopter is being developed and tested by the National Physical Laboratory (NPL) in conjunction with City University, London. The developed system will be used as a key element for field vicarious calibration of optical earth observation systems in the visible-near infrared (VNIR) region. The spectrometer is hand held, low weight, and uses a photodiode array. It has good stray light rejection and wide spectral coverage, allowing simultaneous measurements from 400 to 900 nm. The spectrometer is traceable to NPL’s primary standard cryogenic radiometer via a high-temperature metal-carbon eutectic fixed-point blackbody. Once the fixed-point temperature has been determined (using filter radiometry), the eutectic provides a high emissivity and high stability source of known spectral radiance over the emitted spectral range. All wavelength channels of the spectrometer can be calibrated simultaneously using the eutectic transition without the need for additional instrumentation. The spectrometer itself has been characterized for stray light performance and wavelength accuracy. Its long-term and transportation stability has been proven in an experiment that determined the “World’s Bluest Sky”—a process that involved 56 flights, covering 100,000 km in 72 days. This vicarious calibration methodology using a eutectic standard is presented alongside the preliminary results of an evaluation study of the spectrometer characteristics.

  20. Optimization of the thermogauge furnace for realizing high temperature fixed points

    SciTech Connect

    Wang, T.; Dong, W.; Liu, F.

    2013-09-11

    The thermogauge furnace was commonly used in many NMIs as a blackbody source for calibration of the radiation thermometer. It can also be used for realizing the high temperature fixed point(HTFP). According to our experience, when realizing HTFP we need the furnace provide relative good temperature uniformity to avoid the possible damage to the HTFP. To improve temperature uniformity in the furnace, the furnace tube was machined near the tube ends with a help of a simulation analysis by 'ansys workbench'. Temperature distributions before and after optimization were measured and compared at 1300 °C, 1700°C, 2500 °C, which roughly correspond to Co-C(1324 °C), Pt-C(1738 °C) and Re-C(2474 °C), respectively. The results clearly indicate that through machining the tube the temperature uniformity of the Thermogage furnace can be remarkably improved. A Pt-C high temperature fixed point was realized in the modified Thermogauge furnace subsequently, the plateaus were compared with what obtained using old heater, and the results were presented in this paper.

  1. Dipeptide Aggregation in Aqueous Solution from Fixed Point-Charge Force Fields.

    PubMed

    Götz, Andreas W; Bucher, Denis; Lindert, Steffen; McCammon, J Andrew

    2014-04-01

    The description of aggregation processes with molecular dynamics simulations is a playground for testing biomolecular force fields, including a new generation of force fields that explicitly describe electronic polarization. In this work, we study a system consisting of 50 glycyl-l-alanine (Gly-Ala) dipeptides in solution with 1001 water molecules. Neutron diffraction experiments have shown that at this concentration, Gly-Ala aggregates into large clusters. However, general-purpose force fields in combination with established water models can fail to correctly describe this aggregation process, highlighting important deficiencies in how solute-solute and solute-solvent interactions are parametrized in these force fields. We found that even for the fully polarizable AMOEBA force field, the degree of association is considerably underestimated. Instead, a fixed point-charge approach based on the newly developed IPolQ scheme [Cerutti et al. J. Phys. Chem. 2013, 117, 2328] allows for the correct modeling of the dipeptide aggregation in aqueous solution. This result should stimulate interest in novel fitting schemes that aim to improve the description of the solvent polarization effect within both explicitly polarizable and fixed point-charge frameworks. PMID:24803868

  2. Stability of cobalt-carbon high temperature fixed points doped with iron and platinum

    NASA Astrophysics Data System (ADS)

    K?azovická, L.; Lowe, D.; Machin, G.; Davies, H.; Rani, A.

    2015-04-01

    High temperature fixed points (HTFPs) are stable and repeatable and make comparison of temperature scales possible at a level of uncertainty not previously possible. However, they potentially lack objectivity if the fixed-point temperature is known. Five HTFPs were constructed, one pure Co-C, two Co-C doped with Fe and two Co-C doped with Pt of differing concentrations. The candidate dopants were identified through thermochemical modelling as likely to give maximum temperature shift with minimum increase in melting range. The temperature differences of the doped systems from the pure system were determined and it was found that the addition of Fe depressed the melting temperature and the addition of Pt elevated the melting temperature, qualitatively in line with the thermochemical modelling. The higher concentration doped HTFPs were then aged for approximately 100?h with continuous melting-freezing cycles and the difference to the undoped Co-C HTFP remeasured. These differences were found to agree with those of the unaged results within the measurement uncertainties, confirming artefact stability. It is clear that the doping of HTFPs is a powerful way of constructing stable and reliable high temperature scale comparison artefacts of unknown temperature.

  3. The European Fixed point Open Ocean Observatory network (FixO3): Multidisciplinary observations from the air-sea interface to the deep seafloor

    NASA Astrophysics Data System (ADS)

    Lampitt, Richard; Cristini, Luisa; Alexiou, Sofia

    2015-04-01

    The Fixed point Open Ocean Observatory network (FixO3, http://www.fixo3.eu/ ) integrates 23 European open ocean fixed point observatories and improves access to these infrastructures for the broader community. These provide multidisciplinary observations in all parts of the oceans from the air-sea interface to the deep seafloor. Started in September 2013 with a budget of 7 Million Euros over 4 years, the project has 29 partners drawn from academia, research institutions and SME's coordinated by the National Oceanography Centre, UK. Here we present the programme's achievements in the 18 months and the activities of the 12 Work Packages which have the objectives to: • integrate and harmonise the current procedures and processes • offer free access to observatory infrastructures to those who do not have such access, and free and open data services and products • innovate and enhance the current capability for multidisciplinary in situ ocean observation Open ocean observation is a high priority for European marine and maritime activities. FixO3 provides important data and services to address the Marine Strategy Framework Directive and in support of the European Integrated Maritime Policy. FixO3 provides a strong integrated framework of open ocean facilities in the Atlantic from the Arctic to the Antarctic and throughout the Mediterranean, enabling an integrated, regional and multidisciplinary approach to understand natural and anthropogenic change in the ocean.

  4. Rescheduling Behavioral Subunits of a Fixed Action Pattern by Genetic Manipulation of Peptidergic Signaling

    PubMed Central

    Kim, Do-Hyoung; Han, Mi-Ran; Lee, Gyunghee; Lee, Sang Soo; Kim, Young-Joon; Adams, Michael E.

    2015-01-01

    The ecdysis behavioral sequence in insects is a classic fixed action pattern (FAP) initiated by hormonal signaling. Ecdysis triggering hormones (ETHs) release the FAP through direct actions on the CNS. Here we present evidence implicating two groups of central ETH receptor (ETHR) neurons in scheduling the first two steps of the FAP: kinin (aka drosokinin, leucokinin) neurons regulate pre-ecdysis behavior and CAMB neurons (CCAP, AstCC, MIP, and Bursicon) initiate the switch to ecdysis behavior. Ablation of kinin neurons or altering levels of ETH receptor (ETHR) expression in these neurons modifies timing and intensity of pre-ecdysis behavior. Cell ablation or ETHR knockdown in CAMB neurons delays the switch to ecdysis, whereas overexpression of ETHR or expression of pertussis toxin in these neurons accelerates timing of the switch. Calcium dynamics in kinin neurons are temporally aligned with pre-ecdysis behavior, whereas activity of CAMB neurons coincides with the switch from pre-ecdysis to ecdysis behavior. Activation of CCAP or CAMB neurons through temperature-sensitive TRPM8 gating is sufficient to trigger ecdysis behavior. Our findings demonstrate that kinin and CAMB neurons are direct targets of ETH and play critical roles in scheduling successive behavioral steps in the ecdysis FAP. Moreover, temporal organization of the FAP is likely a function of ETH receptor density in target neurons. PMID:26401953

  5. Sensitivity of collective action to uncertainty about climate tipping points

    NASA Astrophysics Data System (ADS)

    Barrett, Scott; Dannenberg, Astrid

    2014-01-01

    Despite more than two decades of diplomatic effort, concentrations of greenhouse gases continue to trend upwards, creating the risk that we may someday cross a threshold for `dangerous' climate change. Although climate thresholds are very uncertain, new research is trying to devise `early warning signals' of an approaching tipping point. This research offers a tantalizing promise: whereas collective action fails when threshold uncertainty is large, reductions in this uncertainty may bring about the behavioural change needed to avert a climate `catastrophe'. Here we present the results of an experiment, rooted in a game-theoretic model, showing that behaviour differs markedly either side of a dividing line for threshold uncertainty. On one side of the dividing line, where threshold uncertainty is relatively large, free riding proves irresistible and trust illusive, making it virtually inevitable that the tipping point will be crossed. On the other side, where threshold uncertainty is small, the incentive to coordinate is strong and trust more robust, often leading the players to avoid crossing the tipping point. Our results show that uncertainty must be reduced to this `good' side of the dividing line to stimulate the behavioural shift needed to avoid `dangerous' climate change.

  6. Adaptive Control for Buck Power Converter Using Fixed Point Inducting Control and Zero Average Dynamics Strategies

    NASA Astrophysics Data System (ADS)

    Hoyos Velasco, Fredy Edimer; García, Nicolás Toro; Garcés Gómez, Yeison Alberto

    In this paper, the output voltage of a buck power converter is controlled by means of a quasi-sliding scheme. The Fixed Point Inducting Control (FPIC) technique is used for the control design, based on the Zero Average Dynamics (ZAD) strategy, including load estimation by means of the Least Mean Squares (LMS) method. The control scheme is tested in a Rapid Control Prototyping (RCP) system based on Digital Signal Processing (DSP) for dSPACE platform. The closed loop system shows adequate performance. The experimental and simulation results match. The main contribution of this paper is to introduce the load estimator by means of LMS, to make ZAD and FPIC control feasible in load variation conditions. In addition, comparison results for controlled buck converter with SMC, PID and ZAD-FPIC control techniques are shown.

  7. Infra-red fixed point structure characterising SUSY SU(5) symmetry breaking

    E-print Network

    Allanach, Benjamin C; Philipsen, O

    1996-01-01

    We analyze the one-loop renormalisation group equations for the parameters of the Higgs potential of a supersymmetric SU(5) model with first step of symmetry breaking involving an adjoint Higgs. In particular, we investigate the running of the parameters that decide the first step of symmetry breaking in an attempt to establish which symmetry-breaking scenarios would be most likely if the model is the effective low-energy description of some more fundamental theory. An infra-red fixed point is identified analytically. It is located at the boundary between the region of Higgs parameter space corresponding to unbroken SU(5) and the region corresponding to the breaking of SU(5) to the Standard Model, and we elaborate on its implications. We also observe that certain forms of the Higgs potential discussed at tree level in the literature are not renormalisation group invariant.

  8. Point and Fixed Plot Sampling Inventory Estimates at the Savannah River Site, South Carolina.

    SciTech Connect

    Parresol, Bernard, R.

    2004-02-01

    This report provides calculation of systematic point sampling volume estimates for trees greater than or equal to 5 inches diameter breast height (dbh) and fixed radius plot volume estimates for trees < 5 inches dbh at the Savannah River Site (SRS), Aiken County, South Carolina. The inventory of 622 plots was started in March 1999 and completed in January 2002 (Figure 1). Estimates are given in cubic foot volume. The analyses are presented in a series of Tables and Figures. In addition, a preliminary analysis of fuel levels on the SRS is given, based on depth measurements of the duff and litter layers on the 622 inventory plots plus line transect samples of down coarse woody material. Potential standing live fuels are also included. The fuels analyses are presented in a series of tables.

  9. Progress report for the CCT-WG5 high temperature fixed point research plan

    SciTech Connect

    Machin, G.; Woolliams, E. R.; Anhalt, K.; Bloembergen, P.; Sadli, M.; Yamada, Y.

    2013-09-11

    An overview of the progress in High Temperature Fixed Point (HTFP) research conducted under the auspices of the CCT-WG5 research plan is reported. In brief highlights are: Provisional long term stability of HTFPs has been demonstrated. Optimum construction methods for HTFPs have been established and high quality HTFPs of Co-C, Pt-C and Re-C have been constructed for thermodynamic temperature assignment. The major sources of uncertainty in the assignment of thermodynamic temperature have been identified and quantified. The status of absolute radiometric temperature measurement has been quantified through the circulation of a set of HTFPs. The measurement campaign to assign low uncertainty thermodynamic temperatures to a selected set of HTFPs will begin in mid-2012. It is envisaged that this will be complete by 2015 leading to HTFPs becoming routine reference standards for radiometry and high temperature metrology.

  10. Inflation: flow, fixed points and observables to arbitrary order in slow roll

    E-print Network

    William H. Kinney

    2003-05-01

    I generalize the inflationary flow equations of Hoffman and Turner to arbitrary order in slow roll. This makes it possible to study the predictions of slow roll inflation in the full observable parameter space of tensor/scalar ratio $r$, spectral index $n$, and running $d n / d \\ln k$. It also becomes possible to identify exact fixed points in the parameter flow. I numerically evaluate the flow equations to fifth order in slow roll for a set of randomly chosen initial conditions and find that the models cluster strongly in the observable parameter space, indicating a ``generic'' set of predictions for slow roll inflation. I comment briefly on the the interesting proposed correspondence between flow in inflationary parameter space and renormalization group flow in a boundary conformal field theory.

  11. Bratu's problem: A novel approach using fixed-point iterations and Green's functions

    NASA Astrophysics Data System (ADS)

    Kafri, H. Q.; Khuri, S. A.

    2016-01-01

    In this article, the one-dimensional non-linear Bratu's boundary value problem is solved via a novel approach that combines Green's function and fixed point iterative schemes, such as Picard's and Krasnoselskii-Mann's. The convergence of the introduced iterative algorithm is proved using the contraction principle. The method is supported by considering a number of numerical examples that correspond to different cases of eigenvalues. The procedure underlying the strategy reduces calculations and provides highly accurate results in comparison with the exact solution and/or numerical solutions provided in the literature. The current method overcomes the difficulty of treating the problem for eigenvalues near and at the critical value, such as ? = 3 and ? = 3.51, and handles them reliably and very efficiently.

  12. Crustal deformation measurements in central Japan determined by a Global Positioning System fixed-point network

    NASA Technical Reports Server (NTRS)

    Shimada, Seiichi; Bock, Yehuda

    1992-01-01

    Results are presented from temporally dense measurements of crustal deformation associated with the convergence of the Eurasian (EUR), Pacific, North American, and Philippine Sea (PHS) plates, carried out in April 1988 by a 10-station GPS fixed-point network established in central Japan. Using regional orbit relaxation methods, the analysis of the first 17-month data revealed significant horizontal deformation across the Suruga trough. Namely, it was found that a site in the northern tip of PHS plate moved nearly westward with a velocity of 28 +/-5 mm per year, and a site at the southeastern tip of EUR plate moved south-southwestward with a velocity of 18 +/-5 mm per year. A significant vertical uplift with a velocity of 20 mm/yr was detected at a site inland of the Tokai district located in the Akaishi uplift zone and at a site on the Hatsushima Island in Sagami Bay.

  13. Origin of ?I=1/2 Rule for Kaon Decays: QCD Infrared Fixed Point

    E-print Network

    R. J. Crewther; Lewis C. Tunstall

    2012-12-23

    We replace ordinary chiral SU(3)_L * SU(3)_R perturbation theory CHPT_3 by a new theory CHPT_sigma based on a low-energy expansion about an infrared fixed point alpha_IR for 3-flavor QCD. At alpha_IR, the quark condensate _vac =\\= 0 induces nine Nambu-Goldstone bosons: pi, K, eta and a 0++ QCD dilaton sigma. Physically, sigma appears as the f_0(500) resonance, a pole at a complex mass with real part gamma gamma and gamma gamma --> pi pi. We estimate R_IR ~ 5 for the nonperturbative Drell-Yan ratio R = sigma(e+e- --> hadrons)/sigma(e+e- --> mu+mu-) at alpha_IR.

  14. Self-validating type C thermocouples to 2300 °C using high temperature fixed points

    NASA Astrophysics Data System (ADS)

    Pearce, J. V.; Elliott, C. J.; Machin, G.; Ongrai, O.

    2013-09-01

    Above 1500 °C, tungsten-rhenium (W-Re) thermocouples are the most commonly used contact thermometers because they are practical and inexpensive. However in general loss of calibration is very rapid, and, due to their embrittlement at high temperature, it is generally not possible to remove them for recalibration from the process environments in which they are used. Even if removal for recalibration was possible this would be of, at best, very limited use due to large inhomogeneity effects. Ideally, these thermocouples require some mechanism to monitor their drift in-situ. In this study, we describe self-validation of Type C (W5%Re/W26%Re) thermocouples by means of miniature high temperature fixed points comprising crucibles containing respectively Co-C, Pt-C, Ru-C, and Ir-C eutectic alloys. An overview of developments in this area is presented.

  15. An InGaAs detector based radiation thermometer and fixed-point blackbodies for temperature scale realization at NIM

    NASA Astrophysics Data System (ADS)

    Hao, X.; Yuan, Z.; Wang, J.; Lu, X.

    2013-09-01

    In this paper, we describe an InGaAs detector based radiation thermometer (IRT) and new design of fixed-point blackbodies, including Sn, Zn, Al and Cu, for the establishment of a temperature scale from 200 °C to 1085 °C at the National Institute of Metrology of China. The construction and calibration of the IRT with the four fixed-point blackbodies are described. Characteristics of the IRT, such as the size-of-source effect, the amplifier performance and its stability are determined. The design of the four fixed-points, with 10 mm diameter of aperture and 0.9999 emissivity, is described. The uncertainty of the scale realization is elaborated.

  16. An InGaAs detector based radiation thermometer and fixed-point blackbodies for temperature scale realization at NIM

    SciTech Connect

    Hao, X.; Yuan, Z.; Wang, J.; Lu, X.

    2013-09-11

    In this paper, we describe an InGaAs detector based radiation thermometer (IRT) and new design of fixed-point blackbodies, including Sn, Zn, Al and Cu, for the establishment of a temperature scale from 200 °C to 1085 °C at the National Institute of Metrology of China. The construction and calibration of the IRT with the four fixed-point blackbodies are described. Characteristics of the IRT, such as the size-of-source effect, the amplifier performance and its stability are determined. The design of the four fixed-points, with 10 mm diameter of aperture and 0.9999 emissivity, is described. The uncertainty of the scale realization is elaborated.

  17. Assessment of tungsten/rhenium thermocouples with metal-carbon eutectic fixed points up to 1500°C

    SciTech Connect

    Gotoh, M.

    2013-09-11

    Four Type A thermocouples and two Type C thermocouples were calibrated at the Au fixed point and Co-C and Pd-C eutectic fixed points. The thermocouples were exposed to 1330 °C for a total of 100 hours. The maximum drift due to the exposure was found to be 4.8 °C. The fixed-point calibration EMF of these thermocouples deviated by less than 0.86% from the temperature specified by the standards ASTM E230-2003 for Type C and GOSTR 8.585-2001 for Type A. The length of one of Type A thermocouples A52 is longer than the others by 150mm. Making use of this provision it was possible to place annealed part of A52 to the temperature gradient part of calibration arrangement every time. Therefore observed aging effect was as low as 0.5 °C compared to the other thermocouples.

  18. A Jiles-Atherton and fixed-point combined technique for time periodic magnetic field problems with hysteresis

    SciTech Connect

    Chiampi, M.; Repetto, M.; Chiarabaglio, D.

    1995-11-01

    The hysteresis phenomenon can significantly affect the behavior of magnetic cores in electrical machines and devices. This paper presents a finite element solution of periodic steady state magnetic field problems in soft materials with scalar hysteresis. The Jiles-Atherton model is employed for the generation of symmetric B-H loops and it is coupled with the Fixed Point Technique for handling magnetic nonlinearities. The proposed procedure is applied to a hysteretic model problem whose analytical solution is available. The results show that the Fixed Point Technique can efficiently deal with non-single valued material characteristics under periodic operating conditions.

  19. Universal self-similar dynamics of relativistic and nonrelativistic field theories near nonthermal fixed points

    E-print Network

    A. Pineiro Orioli; K. Boguslavski; J. Berges

    2015-03-09

    We investigate universal behavior of isolated many-body systems far from equilibrium, which is relevant for a wide range of applications from ultracold quantum gases to high-energy particle physics. The universality is based on the existence of nonthermal fixed points, which represent nonequilibrium attractor solutions with self-similar scaling behavior. The corresponding dynamic universality classes turn out to be remarkably large, encompassing both relativistic as well as nonrelativistic quantum and classical systems. For the examples of nonrelativistic (Gross-Pitaevskii) and relativistic scalar field theory with quartic self-interactions, we demonstrate that infrared scaling exponents as well as scaling functions agree. We perform two independent nonperturbative calculations, first by using classical-statistical lattice simulation techniques and second by applying a vertex-resummed kinetic theory. The latter extends kinetic descriptions to the nonperturbative regime of overoccupied modes. Our results open new perspectives to learn from experiments with cold atoms aspects about the dynamics during the early stages of our universe.

  20. Universal self-similar dynamics of relativistic and nonrelativistic field theories near nonthermal fixed points

    NASA Astrophysics Data System (ADS)

    Piñeiro Orioli, Asier; Boguslavski, Kirill; Berges, Jürgen

    2015-07-01

    We investigate universal behavior of isolated many-body systems far from equilibrium, which is relevant for a wide range of applications from ultracold quantum gases to high-energy particle physics. The universality is based on the existence of nonthermal fixed points, which represent nonequilibrium attractor solutions with self-similar scaling behavior. The corresponding dynamic universality classes turn out to be remarkably large, encompassing both relativistic as well as nonrelativistic quantum and classical systems. For the examples of nonrelativistic (Gross-Pitaevskii) and relativistic scalar field theory with quartic self-interactions, we demonstrate that infrared scaling exponents as well as scaling functions agree. We perform two independent nonperturbative calculations, first by using classical-statistical lattice simulation techniques and second by applying a vertex-resummed kinetic theory. The latter extends kinetic descriptions to the nonperturbative regime of overoccupied modes. Our results open new perspectives to learn from experiments with cold atoms aspects about the dynamics during the early stages of our universe.

  1. Realization of the WC-C peritectic fixed point at NIM and NMIJ

    SciTech Connect

    Wang, T.; Bai, C.; Yuan, Z.; Dong, W.; Lu, X.; Sasajima, N.; Yamada, Y.; Ara, C.

    2013-09-11

    Three WC-C peritectic fixed point cells, constructed from different sources of tungsten with different nominal purities, were measured at NIM and NMIJ. The three cells were constructed at NMIJ by NIM and NMIJ staffs, and T{sub 90} values of the three cells were measured at NMIJ during the period 31 Aug. to 25 Dec. 2009. Thereafter, the three cells were then transported to NIM, and T{sub 90} values of these cells were measured from 7 Dec. 2011 to 9 Jan. 2012. The results showed that T{sub 90} values of the three cells measured at the two institutes agreed within 0.4 °C with the combined scale comparison uncertainty of 1.7 °C (k= 2). The main component of the uncertainty is not the uncertainty due to impurities of the cells but the scale uncertainty and the stability of the measurement system. From these results it can be concluded that the WC-C cell is stable enough to provide new means of international high-temperature scale comparison above 3000 K.

  2. General fixed points of quasi-local frustration-free quantum semigroups: from invariance to stabilization

    E-print Network

    Peter D. Johnson; Francesco Ticozzi; Lorenza Viola

    2015-06-25

    We investigate under which conditions a general mixed state on a finite-dimensional multipartite quantum system may be the unique, globally stable fixed point of frustration-free semigroup dynamics subject to specified quasi-locality constraints. Our central result is a linear-algebraic necessary and sufficient condition for a generic (full-rank) target state to be frustration-free quasi-locally stabilizable, along with an explicit procedure for constructing Markovian dynamics that achieve stabilization. If the target state is not full-rank, we establish sufficiency under an additional condition, which is naturally motivated by consistency with pure-state stabilization results yet provably not necessary in general. Several applications of our formalism are discussed, of relevance to both dissipative quantum engineering and non-equilibrium quantum statistical mechanics. In particular, we show that a large class of graph product states (including arbitrary thermal graph states) as well as Gibbs states of commuting Hamiltonians are frustration-free quasi-locally stabilizable relative to natural quasi-locality constraints. In addition, we explicitly demonstrate how stabilization may still be achieved, including for target states exhibiting non-trivial multipartite entanglement, despite the lack of an underlying commuting structure, albeit scalability to arbitrary system size remains in this case an open question.

  3. Validity of the use of a fixed point for intracycle velocity calculations in swimming.

    PubMed

    Psycharakis, Stelios G; Sanders, Ross H

    2009-03-01

    The intracycle velocity (V) of a fixed point on a swimmer's body, usually the hip, is frequently calculated as a direct indication of the intracycle V of the centre of mass (CM). The purpose of this study was to examine whether the intracycle V of the hip reflects accurately the intracycle V of the CM in freestyle swimming. One stroke cycle was analysed for ten swimmers performing a maximum freestyle swim. The magnitude of differences between CM and hip values was calculated for the instantaneous V values, the intracycle V fluctuation (V(fluc)) and the magnitude and timing of appearance of maximum (V(max)) and minimum intracycle V (V(min)). Large differences were found in all variables, with the use of the hip for V calculations overestimating significantly V(max) and underestimating significantly V(min) and V(fluc) of the CM (p< or =0.001). The results of this study showed that the hip motion should not be used as an indication of the intracycle CM motion in freestyle swimming. PMID:18289938

  4. Artifact Removal from Biosignal using Fixed Point ICA Algorithm for Pre-processing in Biometric Recognition

    NASA Astrophysics Data System (ADS)

    Mishra, Puneet; Singla, Sunil Kumar

    2013-01-01

    In the modern world of automation, biological signals, especially Electroencephalogram (EEG) and Electrocardiogram (ECG), are gaining wide attention as a source of biometric information. Earlier studies have shown that EEG and ECG show versatility with individuals and every individual has distinct EEG and ECG spectrum. EEG (which can be recorded from the scalp due to the effect of millions of neurons) may contain noise signals such as eye blink, eye movement, muscular movement, line noise, etc. Similarly, ECG may contain artifact like line noise, tremor artifacts, baseline wandering, etc. These noise signals are required to be separated from the EEG and ECG signals to obtain the accurate results. This paper proposes a technique for the removal of eye blink artifact from EEG and ECG signal using fixed point or FastICA algorithm of Independent Component Analysis (ICA). For validation, FastICA algorithm has been applied to synthetic signal prepared by adding random noise to the Electrocardiogram (ECG) signal. FastICA algorithm separates the signal into two independent components, i.e. ECG pure and artifact signal. Similarly, the same algorithm has been applied to remove the artifacts (Electrooculogram or eye blink) from the EEG signal.

  5. A miniature high-temperature fixed point for self-validation of type C thermocouples

    NASA Astrophysics Data System (ADS)

    Ongrai, O.; Pearce, J. V.; Machin, G.; Sweeney, S. J.

    2011-10-01

    Reliable high-temperature (>1500 °C) measurement is crucial for a wide range of industrial processes as well as specialized applications, e.g. aerospace. The most common type of sensor used for high-temperature measurement is the thermocouple. At and above 1500 °C, tungsten-rhenium (W-Re) thermocouples are the most commonly used temperature sensors due to their utility up to 2300 °C. However, the achievable accuracy of W-Re thermocouples is seriously limited by the effects of their inhomogeneity, drift and hysteresis. Furthermore, due to their embrittlement at high temperature, the removal of these thermocouples from environments such as nuclear power plants or materials processing furnaces for recalibration is generally not possible. Even if removal for recalibration were possible, this would be of, at best, very limited use due to large inhomogeneity effects. Ideally, these thermocouples require some mechanism to monitor their drift in situ. In this study, we describe a miniature Co-C eutectic fixed-point cell to evaluate the stability of type C (W5%Re/W26%Re) thermocouples by means of in situ calibration.

  6. Overcoming the Limitations of the SIE and OME Methods in Assessing the Effects of Impurities in Temperature Fixed Points

    NASA Astrophysics Data System (ADS)

    Fahr, M.; Cundy, D. S.

    2015-08-01

    Impurities are still among the primary concerns regarding the realization of many fixed points of the International Temperature Scale (ITS-90). Several methods have been suggested to correct for these effects. The most promising strategy, with regard to the achievable uncertainty level, is the `sum of the individual estimates' (SIE) method. It involves a chemical analysis of the material and a calculation of each of the detected chemical species' effect on the phase-transition temperature of the fixed-point substance. This correction can be accurate only if all the detected impurities are completely dissolved. Given the recent evidence for insoluble impurities in metal fixed points, this strategy needs to be modified; otherwise, it may lead to an inaccurate estimation of the impurity-related effect on the fixed-point temperature. In this article, a correction method is set out that reflects the crucial distinction between soluble, insoluble, and partially soluble impurities. This `sum of the individual estimates for the dissolved species' (SIEDS) method starts from a chemical analysis but takes into account only the dissolved particles. For this purpose, different types of substances are considered as possible dissolved impurities and are discussed from a chemical point of view. For those impurities where data are insufficient, only an uncertainty estimation is possible. For this purpose, the `overall maximum estimate of the dissolved species' (OMEDS) method is derived from the SIEDS method as the new counterpart to the well-known `overall maximum estimate' (OME) method.

  7. Influence of the Cavity Length on the Behavior of Hybrid Fixed-Point Cells Constructed at INRIM

    NASA Astrophysics Data System (ADS)

    Battuello, M.; Girard, F.; Florio, M.

    2015-03-01

    Hybrid cells with double carbon/carbon sheets are used at the Istituto Nazionale di Ricerca Metrologica (INRIM) for the realization of both pure metal fixed points and high-temperature metal-carbon eutectic points. Cells for the Cu and Co-C fixed points have been prepared to be used in the high-temperature fixed-point project of the Comité Consultatif de Thermométrie. The results of the evaluation processes were not completely satisfactory for the INRIM cells because of their low transition temperatures with respect to the best cells, and of a rather large melting range for the Co-C cell. A new design of the cells was devised, and considerable improvements were achieved with respect to the transition temperature, and the plateau shape and duration. As for the Cu point, the duration of the freezing plateaux increased by more than 50 % and the freezing temperature increased by 18 mK. As for the Co-C point, the melting temperature, expressed in terms of the point of inflection of the melting curve, increased by about 70 mK. The melting range of the plateaux, expressed as a difference was reduced from about 180 mK to about 130 mK, with melting times increased by about 50 %, as a consequence of an improvement of flatness and run-off of the plateaux.

  8. Nekhoroshev stability of nonlinear normal modes near an elliptic fixed point of a Hamiltonian system with symmetry

    E-print Network

    Nekhoroshev stability of non­linear normal modes near an elliptic fixed point of a Hamiltonian of small amplitude periodic orbits (the non­linear normal modes) of approximating systems. We show that are in many cases weaker than integrability and convexity, the non­linear normal modes are Nekhoroshev stable

  9. YouTube All Around: Characterizing YouTube from Mobile and Fixed-line Network Vantage Points

    E-print Network

    Giaccone, Paolo

    }@tlc.polito.it Abstract--YouTube is the most popular service in today's Internet. Its own success forces Google the massive Google CDN is paramount for ISPs, specially for mobile operators, who must handle the huge surge characterization from mobile and fixed-line vantage points. Keywords--YouTube; Google; Content Delivery Networks

  10. Stationary point analysis of the one-dimensional lattice Landau gauge fixing functional, aka random phase XY Hamiltonian

    SciTech Connect

    Mehta, Dhagash; Kastner, Michael

    2011-06-15

    Research Highlights: > Exact results for all stationary points of some high-dimensional function are given. > They are interpreted as Gribov copies of a lattice Landau gauge fixing functional. > The Gribov ambiguity and the Neuberger problem in compact U(1) are illustrated. > Stationary points are used to discuss a criterion on the absence of phase transitions. - Abstract: We study the stationary points of what is known as the lattice Landau gauge fixing functional in one-dimensional compact U(1) lattice gauge theory, or as the Hamiltonian of the one-dimensional random phase XY model in statistical physics. An analytic solution of all stationary points is derived for lattices with an odd number of lattice sites and periodic boundary conditions. In the context of lattice gauge theory, these stationary points and their indices are used to compute the gauge fixing partition function, making reference in particular to the Neuberger problem. Interpreted as stationary points of the one-dimensional XY Hamiltonian, the solutions and their Hessian determinants allow us to evaluate a criterion which makes predictions on the existence of phase transitions and the corresponding critical energies in the thermodynamic limit.

  11. Study of Strangeness Condensation by Expanding About the Fixed Point of the Harada-Yamawaki Vector Manifestation

    E-print Network

    G. E. Brown; C. -H. Lee; H. -J. Park; M. Rho

    2005-10-06

    Building on, and extending, the result of a higher-order in-medium chiral perturbation theory combined with renormalization group arguments and a variety of observations of the vector manifestation of Harada-Yamawaki hidden local symmetry theory, we obtain a surprisingly simple description of kaon condensation by fluctuating around the "vector manifestation (VM)" fixed point identified to be the chiral restoration point. Our development establishes that strangeness condensation takes place at about 3 n_0 where n_0 is nuclear matter density. This result depends only on the renoramlization-group (RG) behavior of the vector interactions, other effects involved in fluctuating about the bare vacuum in so many previous calculations being "irrelevant" in the RG about the fixed point. Our results have major effects on the collapse of neutron stars into black holes.

  12. Fixed-point structure of low-dimensional relativistic fermion field theories: Universality classes and emergent symmetry

    E-print Network

    Friedrich Gehring; Holger Gies; Lukas Janssen

    2015-10-30

    We investigate a class of relativistic fermion theories in 2unified framework. Within the limit of pointlike interactions, the RG flow of couplings reveals a network of interacting fixed points, each of which defines a universality class. A subset of fixed points are "critical fixed points" with one RG relevant direction being candidates for critical points of second-order phase transitions. Identifying invariant hyperplanes of the RG flow and classifying their attractive/repulsive properties, we find evidence for emergent higher chiral symmetries as a function of Nf. For the case of the Thirring model, we discover a new critical flavor number that separates the RG stable large-Nf regime from an intermediate-Nf regime in which symmetry-breaking perturbations become RG relevant. This new critical flavor number has to be distinguished from the chiral-critical flavor number, below which the Thirring model is expected to allow spontaneous chiral symmetry breaking, and its existence offers a resolution to the discrepancy between previous results obtained in the continuum and the lattice Thirring models. Moreover, we find indications for a new feature of universality: details of the critical behavior can depend on additional "spectator symmetries" that remain intact across the phase transition. Implications for the physics of interacting fermions on the honeycomb lattice, for which our theory space provides a simple model, are given.

  13. The quantum gravitational field theory and the domains of its fix points for inflationary or low-redshift universe

    NASA Astrophysics Data System (ADS)

    Xue, She-Sheng

    2015-10-01

    We study a quantum field theory for the Einstein-Cartan gravity and the domain of its ultraviolet unstable (stable) fixed point ?c ? 0 (Gc ? GN) of running gravitational constant G, where inflationary (low-redshift) universe can be realized as the basic space-time cutoff ã approaching to the Planck length apl. Because the fundamental operators of quantum gravitational field theory are dimension-2 area operators, the cosmological constant is inversely proportional to the squared correlation length ? ? ??2. The correlation length ? characterizes an infrared size of a causally correlate patch of the universe. The quantitative description of low-redshift universe in the scaling-invariant region of fixed point Gc is given, and its deviation from the ?CDM can be examined by recent cosmological observations, such as supernova Type Ia.

  14. Measuring Functional Renormalization Group Fixed-Point Functions for Pinned Manifolds A. Alan Middleton,1

    E-print Network

    Wiese, Kay Jörg

    . Proposed field theories are unconventional and harder to control than those for pure critical systems of nonanalytic functions, perturbative control was recovered to one-loop order [i.e., to O 4 ÿ d] and fixed be avoided. This Letter presents a new level of ``smoking gun'' tests of the FRG for manifolds, by directly

  15. Formalin Fixed Paraffin Embedded Tissue as a Starting Point for PrPSc Detection by ELISA

    Technology Transfer Automated Retrieval System (TEKTRAN)

    Introduction: Formalin fixed paraffin embedded tissue are regularly employed in TSE diagnosis by IHC, the standard by which all other diagnostic protocols are currently judged. While IHC affords advantages over diagnostic approaches that typically utilize fresh or frozen tissue, such as Western blot...

  16. A fixed point in Coptic Chronology: the solar eclipse of 10 March, 601

    E-print Network

    John Ray; Gerry Gilmore

    2006-07-22

    We reconsider the description of a solar eclipse in the Coptic ostracon in the Egyptian museum, Turin, confirming its identification with the solar eclipse of 10 march 601. This provides one of very few fixed dates in Coptic chronology. We comment on the rarity of such descriptions.

  17. Walking near a Conformal Fixed Point: the 2-d O(3) Model at theta near pi as a Test Case

    E-print Network

    Philippe de Forcrand; Michele Pepe; Uwe-Jens Wiese

    2012-04-22

    Slowly walking technicolor models provide a mechanism for electroweak symmetry breaking whose nonperturbative lattice investigation is rather challenging. Here we demonstrate walking near a conformal fixed point considering the 2-d lattice O(3) model at vacuum angle $\\theta \\approx \\pi$. The essential features of walking technicolor models are shared by this toy model and can be accurately investigated by numerical simulations. We show results for the running coupling and the beta-function and we perform a finite size scaling analysis of the massgap close to the conformal point.

  18. Population fixed-points for functions of unitation J o n a t h a n E . R o w e

    E-print Network

    Rowe, Jon

    of the population p given by Note that this definition is valid also for ;> outside the simplex. The effects of one69 Population fixed-points for functions of unitation J o n a t h a n E . R o w e Artificial. Infinite population fixed-points are calculated for some simple examples, including trap functions

  19. Infrared Fixed Point in the Strong Running Coupling: Unraveling the ?I=1/2 puzzle in K-Decays

    E-print Network

    R. J. Crewther; Lewis C. Tunstall

    2013-06-19

    In this talk, we present an explanation for the Delta I = 1/2 rule in K-decays based on the premise of an infrared fixed point alpha_IR in the running coupling alpha_s of quantum chromodynamics (QCD) for three light quarks u,d,s. At the fixed point, the quark condensate spontaneously breaks scale and chiral SU(3)_L x SU(3)_R symmetry. Consequently, the low-lying spectrum contains nine Nambu-Goldstone bosons: pi,K,eta and a QCD dilaton sigma. We identify sigma as the f_0(500) resonance and construct a chiral-scale perturbation theory CHPT_sigma for low-energy amplitudes expanded in alpha_s about alpha_IR. The Delta I = 1/2 rule emerges in the leading order of CHPT_sigma through a sigma-pole term K_S --> sigma --> 2 pi, with a K_S-sigma coupling fixed by data on 2 gamma --> 2 pi^0 and K_S --> 2 gamma. We also determine R_IR ~ 5 for the nonperturbative Drell-Yan ratio at alpha_IR.

  20. Fixed-point structure of low-dimensional relativistic fermion field theories: Universality classes and emergent symmetry

    NASA Astrophysics Data System (ADS)

    Gehring, Friedrich; Gies, Holger; Janssen, Lukas

    2015-10-01

    We investigate a class of relativistic fermion theories in 2 fixed points, each of which defines a universality class. A subset of fixed points are "critical fixed points" with one RG relevant direction being candidates for critical points of second-order phase transitions. Identifying invariant hyperplanes of the RG flow and classifying their attractive/repulsive properties, we find evidence for emergent higher chiral symmetries as a function of Nf. For the case of the Thirring model, we discover a new critical flavor number that separates the RG stable large-Nf regime from an intermediate-Nf regime in which symmetry-breaking perturbations become RG relevant. This new critical flavor number has to be distinguished from the chiral-critical flavor number, below which the Thirring model is expected to allow spontaneous chiral symmetry breaking, and its existence offers a resolution to the discrepancy between previous results obtained in the continuum and the lattice Thirring models. Moreover, we find indications for a new feature of universality: details of the critical behavior can depend on additional "spectator symmetries" that remain intact across the phase transition. Implications for the physics of interacting fermions on the honeycomb lattice, for which our theory space provides a simple model, are given.

  1. Two-stage fixed-bed gasifier with selectable middle gas off-take point

    DOEpatents

    Strickland, Larry D. (Morgantown, WV); Bissett, Larry A. (Morgantown, WV)

    1992-01-01

    A two-stage fixed bed coal gasifier wherein an annular region is in registry with a gasification zone underlying a devolatilization zone for extracting a side stream of high temperature substantially tar-free gas from the gasifier. A vertically displaceable skirt means is positioned within the gasifier to define the lower portion of the annular region so that vertical displacement of the skirt means positions the inlet into the annular region in a selected location within or in close proximity to the gasification zone for providing a positive control over the composition of the side stream gas.

  2. Corrective Action Decision Document for Corrective Action Unit 516: Septic Systems and Discharge Points, Nevada Test Site, Nevada: Revision 1

    SciTech Connect

    U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office

    2004-04-28

    This Corrective Action Decision Document (CADD) identifies and rationalizes the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office's selection of a recommended corrective action alternative appropriate to facilitate the closure of Corrective Action Unit (CAU) 516: Septic Systems and Discharge Points, Nevada Test Site (NTS), Nevada, under the Federal Facility Agreement and Consent Order. Located in Areas 3, 6, and 22 on the NTS, CAU 516 includes six Corrective Action Sites (CASs) consisting of two septic systems, a sump and piping, a clean-out box and piping, dry wells, and a vehicle decontamination area. Corrective action investigation activities were performed from July 22 through August 14, 2003, with supplemental sampling conducted in late 2003 and early 2004. The potential exposure pathways for any contaminants of concern (COCs) identified during the development of the DQOs at CAU 516 gave rise to the following objectives: (1) prevent or mitigate exposure to media containing COCs at concentrations exceeding PALs as defined in the corrective action investigation plan; and (2) prevent the spread of COCs beyond each CAS. The following alternatives have been developed for consideration at CAU 516: Alternative 1 - No Further Action; Alternative 2 - Clean Closure; and Alternative 3 - Closure in Place with Administrative Controls. Alternative 1, No Further Action, is the preferred corrective action for two CASs (06-51-02 and 22-19-04). Alternative 2, Clean Closure, is the preferred corrective action for four CASs (03-59-01, 03-59-02, 06-51-01, and 06-51-03). The selected alternatives were judged to meet all requirements for the technical components evaluated, as well as meeting all applicable state and federal regulations for closure of the site and will further eliminate the contaminated media at CAU 516.

  3. Some Issues Concerning Fixed Points in Computational Logic: Quasi-Metrics, Multivalued Mappings and the

    E-print Network

    Hitzler, Pascal

    and the Knaster-Tarski Theorem Pascal Hitzlery and Anthony Karel Seda August 7, 2000 Department of Mathematics- tivalued mappings, of the Knaster-Tarski theorem and of the Banach contraction map- ping theorem, and formulate a version of the classical xed-point theorem (sometimes attributed to Kleene) which is new. All

  4. SU-E-T-539: Fixed Versus Variable Optimization Points in Combined-Mode Modulated Arc Therapy Planning

    SciTech Connect

    Kainz, K; Prah, D; Ahunbay, E; Li, X

    2014-06-01

    Purpose: A novel modulated arc therapy technique, mARC, enables superposition of step-and-shoot IMRT segments upon a subset of the optimization points (OPs) of a continuous-arc delivery. We compare two approaches to mARC planning: one with the number of OPs fixed throughout optimization, and another where the planning system determines the number of OPs in the final plan, subject to an upper limit defined at the outset. Methods: Fixed-OP mARC planning was performed for representative cases using Panther v. 5.01 (Prowess, Inc.), while variable-OP mARC planning used Monaco v. 5.00 (Elekta, Inc.). All Monaco planning used an upper limit of 91 OPs; those OPs with minimal MU were removed during optimization. Plans were delivered, and delivery times recorded, on a Siemens Artiste accelerator using a flat 6MV beam with 300 MU/min rate. Dose distributions measured using ArcCheck (Sun Nuclear Corporation, Inc.) were compared with the plan calculation; the two were deemed consistent if they agreed to within 3.5% in absolute dose and 3.5 mm in distance-to-agreement among > 95% of the diodes within the direct beam. Results: Example cases included a prostate and a head-and-neck planned with a single arc and fraction doses of 1.8 and 2.0 Gy, respectively. Aside from slightly more uniform target dose for the variable-OP plans, the DVHs for the two techniques were similar. For the fixed-OP technique, the number of OPs was 38 and 39, and the delivery time was 228 and 259 seconds, respectively, for the prostate and head-and-neck cases. For the final variable-OP plans, there were 91 and 85 OPs, and the delivery time was 296 and 440 seconds, correspondingly longer than for fixed-OP. Conclusion: For mARC, both the fixed-OP and variable-OP approaches produced comparable-quality plans whose delivery was successfully verified. To keep delivery time per fraction short, a fixed-OP planning approach is preferred.

  5. Optimizing Heat Treatment of Gas Turbine Blades with a Co C Fixed Point for Improved In-service Thermocouples

    NASA Astrophysics Data System (ADS)

    Pearce, J. V.; Machin, G.; Ford, T.; Wardle, S.

    2008-02-01

    Improvement of energy efficiency of jet aircraft is achieved by operating gas turbine engines at higher temperatures. To facilitate this, gas turbine engine manufacturers are continuously developing new alloys for hot-zone turbine blades that will withstand the increased in-service temperatures. A critical part of the manufacture of these blades is heat treatment to ensure that they attain the necessary metallurgical characteristics. Current heat-treatment temperature-control requirements are at the limit of what is achievable with conventional thermocouple calibrations. A project that will allow thermocouple manufacturer CCPI Europe Ltd. to realize uncertainties of ± 1°C, or better, in the calibration of its noble metal thermocouples is described. This will be realized through implementing a Co C eutectic fixed point in CCPI’s calibration chain. As this melts at 1,324°C, very close to the heat-treatment temperatures required, low uncertainties will be obtained. This should yield an increase in effectiveness of the heat-treatment process performed by Bodycote Heat Treatments Ltd., allowing them to respond effectively to the increasingly stringent demands of engine manufacturers. Outside the current project, there is a strong requirement by industry for lower uncertainties at and above 1,300°C. Successful implementation of the current fixed point in an industrial setting is likely to result in rapid take-up by other companies, probably through the supply of ultra-low uncertainty thermocouples, looking to improve their high-temperature processes.

  6. Fixed-point structure and effective fractional dimensionality for O(N ) models with long-range interactions

    NASA Astrophysics Data System (ADS)

    Defenu, Nicoló; Trombettoni, Andrea; Codello, Alessandro

    2015-11-01

    We study, by renormalization group methods, O (N ) models with interactions decaying as power law with exponent d +? . When only the long-range momentum term p? is considered in the propagator, the critical exponents can be computed from those of the corresponding short-range O (N ) models at an effective fractional dimension Deff. Neglecting wave function renormalization effects the result for the effective dimension is Deff=2/d ? , which turns to be exact in the spherical model limit (N ?? ) . Introducing a running wave function renormalization term the effective dimension becomes instead Deff=(2/-?SR)d ? . The latter result coincides with the one found using standard scaling arguments. Explicit results in two and three dimensions are given for the exponent ? . We propose an improved method to describe the full theory space of the models where both short- and long-range propagator terms are present and no a priori choice among the two in the renormalization group flow is done. The eigenvalue spectrum of the full theory for all possible fixed points is drawn and a full description of the fixed-point structure is given, including multicritical long-range universality classes. The effective dimension is shown to be only approximate, and the resulting error is estimated.

  7. Corrective Action Decision Document for Corrective Action Unit 423: Building 03-60 Underground Discharge Point, Tonopah Test Range, Nevada

    SciTech Connect

    DOE /NV

    1999-06-19

    This Corrective Action Decision Document (CADD) has been prepared for Corrective Action Unit (CAU) 423, Building 03-60 Underground Discharge Point (UDP) in accordance with the Federal Facility Agreement and Consent Order (FFACO) of 1996 that was agreed to by the US Department of Energy, Nevada Operations Office (DOE/NV); the Nevada Division of Environmental Protection (NDEP); and the U.S Department of Defense (FFACO, 1996). The CADD provides or references the specific information necessary to recommend a preferred corrective action for the single Corrective Action Site (CAS), 03-02-002-0308, within CAU 423. Corrective Action Unit 423 is located at the Tonopah Test Range (TTR), Nevada. The TTR is approximately 255 kilometers (km) (140 miles[mi]) northwest of Las Vegas, Nevada. The UDP is approximately 73 meters (m) (240 feet [ft]) northwest of the northwest corner of Building 03-60, the Auto Maintenance Shop. Corrective Action Unit 423 is comprised of the UDP and an associated discharge line extending from Building 03-60. The UDP received waste oil products from the Auto Maintenance Shop, a light-duty fleet maintenance shop in the Area 3 compound, from 1965 to 1989 or 1990 (DOE/NV, 1997).

  8. Construction of Home-Made Tin Fixed-Point Cell at TUBITAK UME

    NASA Astrophysics Data System (ADS)

    Kalemci, M.; Arifovic, N.; Ba?çe, A.; Aytekin, S. O.; Ince, A. T.

    2015-08-01

    TUBITAK UME Temperature Laboratory initiated a new study which focuses on the construction of a tin freezing-point cell as a primary temperature standard. The design is an open-cell type similar to the National Institute of Standards and Technology design. With this aim, a brand new vacuum and filling line employing an oil diffusion pump and two cold traps (liquid nitrogen and dry ice) was set-up. The graphite parts (crucible, thermometer well, etc.) have been baked at high temperature under vacuum. Each cell was filled with approximately 1 kg of high-purity tin (99.9999 %) in a three-zone furnace. Then several melting and freezing curves were obtained to assess the quality of the home-made cell, and also the new cell was compared with the existing reference cell of the laboratory. The results obtained are very close to the reference cell of UME, indicating that the method used for fabrication was promising and satisfactory and also seems to meet the requirements to have a primary level temperature standard.

  9. Corrective Action Plan for Corrective Action Unit 262: Area 25 Septic Systems and Underground Discharge Point, Nevada Test Site, Nevada

    SciTech Connect

    K. B. Campbell

    2002-06-01

    This Corrective Action Plan (CAP) provides selected corrective action alternatives and proposes the closure methodology for Corrective Action Unit (CAU) 262, Area 25 Septic Systems and Underground Discharge Point. CAU 262 is identified in the Federal Facility Agreement and Consent Order (FFACO) of 1996. Remediation of CAU 262 is required under the FFACO. CAU 262 is located in Area 25 of the Nevada Test Site (NTS), approximately 100 kilometers (km) (62 miles [mi]) northwest of Las Vegas, Nevada. The nine Corrective Action Sites (CASs) within CAU 262 are located in the Nuclear Rocket Development Station complex. Individual CASs are located in the vicinity of the Reactor Maintenance, Assembly, and Disassembly (R-MAD); Engine Maintenance, Assembly, and Disassembly (E-MAD); and Test Cell C compounds. CAU 262 includes the following CASs as provided in the FFACO (1996); CAS 25-02-06, Underground Storage Tank; CAS 25-04-06, Septic Systems A and B; CAS 25-04-07, Septic System; CAS 25-05-03, Leachfield; CAS 25-05-05, Leachfield; CAS 25-05-06, Leachfield; CAS 25-05-08, Radioactive Leachfield; CAS 25-05-12, Leachfield; and CAS 25-51-01, Dry Well. Figures 2, 3, and 4 show the locations of the R-MAD, the E-MAD, and the Test Cell C CASs, respectively. The facilities within CAU 262 supported nuclear rocket reactor engine testing. Activities associated with the program were performed between 1958 and 1973. However, several other projects used the facilities after 1973. A significant quantity of radioactive and sanitary waste was produced during routine operations. Most of the radioactive waste was managed by disposal in the posted leachfields. Sanitary wastes were disposed in sanitary leachfields. Septic tanks, present at sanitary leachfields (i.e., CAS 25-02-06,2504-06 [Septic Systems A and B], 25-04-07, 25-05-05,25-05-12) allowed solids to settle out of suspension prior to entering the leachfield. Posted leachfields do not contain septic tanks. All CASs located in CAU 262 are inactive or abandoned. However, some leachfields may still receive liquids from runoff during storm events. Results from the 2000-2001 site characterization activities conducted by International Technology (IT) Corporation, Las Vegas Office are documented in the Corrective Action Investigation Report for Corrective Action Unit 262: Area 25 Septic Systems and Underground Discharge Point, Nevada Test Site, Nevada. This document is located in Appendix A of the Corrective Action Decision Document for CAU 262. Area 25 Septic Systems and Underground Discharge Point, Nevada Test Site, Nevada. (DOE/NV, 2001).

  10. A Phase-Field Solidification Model of Almost Pure ITS-90 Fixed Points

    NASA Astrophysics Data System (ADS)

    Large, M. J.; Pearce, J. V.

    2014-07-01

    A two-dimensional axisymmetric phase-field model of thermo-solutal solidification in freezing-point cells used for calibrating standard platinum resistance thermometers for realization and dissemination of the International Temperature Scale of 1990 is presented. The cell is essentially a graphite crucible containing an ingot of very pure metal (of order 99.9999 %). A graphite tube is inserted along the axis of the ingot to enable immersion of the thermometer in the metal. In this study, the metal is tin (freezing temperature of ). During the freezing of these cells, a steady, reproducible temperature is realized, with a defined temperature that can be used to calibrate thermometers with uncertainties mK. The model is applied to understand the effect of experimental parameters, such as initiation technique and furnace homogeneity, on the measured freezing curve. Results show that freezing curves whose behavior is consistent with the Scheil theory of solidification can be obtained with a specific furnace temperature profile, and provided that the freeze is of a long duration, the results are consistent with previous one-dimensional models and experiments. Morphological instability is observed with the inner interface initiation technique, causing the interface to adopt a cellular structure. This elevates the measured temperature, in accordance with the Gibbs-Thomson effect. In addition, the influence of initiation techniques on the solidification behavior is examined. The model indicates that an initially smooth inner mantle can `de-wet' from the thermometer well-forming agglomerated solid droplets, following recalescence, under certain conditions. This manifests as a measured temperature depression due to the Gibbs-Thomson effect, with a magnitude of to in simulations. The temperature rises to that of the stable outer mantle as freezing progresses and the droplets re-melt. It is demonstrated that the effect occurs below a critical mantle thickness. A physical explanation for the origin of the effect is offered showing that it is consistent with solid-state de-wetting phenomena. Consideration is also given to the limitations of the current model configuration.

  11. Perceiving the Direction of Articulatory Motion in Point-Light Actions

    PubMed Central

    Davila, Alex; Schouten, Ben; Verfaillie, Karl

    2014-01-01

    Human observers are able to perceive the motion direction of actions (either forward or backward) on the basis of the articulatory, relative motion of the limbs, even when the actions are shown under point-light conditions. However, most studies have focused on the action of walking. The primary purpose of the present study is to further investigate the perception of articulatory motion in different point-light actions (walking, crawling, hand walking, and rowing). On each trial, participants were presented with a forward or backward moving person and they had to decide on the direction of articulatory motion of the person. We analyzed sensitivity (d') as well as response bias (c). In addition to the type of action, the diagnosticity of the available information was manipulated by varying the visibility of the body parts (full body, only upper limbs, or only lower limbs) and the viewpoint from which the action was seen (from frontal view to sagittal view). We observe that, depending on the specific action, perception of direction of motion is driven by different body parts. Implications for the possible existence of a life detector, i.e., an evolutionarily old and innate visual filter that is tuned to quickly and automatically detect the presence of a moving living organism and direct attention to it, are discussed. PMID:25526397

  12. Characterizing the size distribution of particles in urban stormwater by use of fixed-point sample-collection methods

    USGS Publications Warehouse

    Selbig, William R.; Bannerman, Roger T.

    2011-01-01

    The U.S Geological Survey, in cooperation with the Wisconsin Department of Natural Resources (WDNR) and in collaboration with the Root River Municipal Stormwater Permit Group monitored eight urban source areas representing six types of source areas in or near Madison, Wis. in an effort to improve characterization of particle-size distributions in urban stormwater by use of fixed-point sample collection methods. The types of source areas were parking lot, feeder street, collector street, arterial street, rooftop, and mixed use. This information can then be used by environmental managers and engineers when selecting the most appropriate control devices for the removal of solids from urban stormwater. Mixed-use and parking-lot study areas had the lowest median particle sizes (42 and 54 (u or mu)m, respectively), followed by the collector street study area (70 (u or mu)m). Both arterial street and institutional roof study areas had similar median particle sizes of approximately 95 (u or mu)m. Finally, the feeder street study area showed the largest median particle size of nearly 200 (u or mu)m. Median particle sizes measured as part of this study were somewhat comparable to those reported in previous studies from similar source areas. The majority of particle mass in four out of six source areas was silt and clay particles that are less than 32 (u or mu)m in size. Distributions of particles ranging from 500 (u or mu)m were highly variable both within and between source areas. Results of this study suggest substantial variability in data can inhibit the development of a single particle-size distribution that is representative of stormwater runoff generated from a single source area or land use. Continued development of improved sample collection methods, such as the depth-integrated sample arm, may reduce variability in particle-size distributions by mitigating the effect of sediment bias inherent with a fixed-point sampler.

  13. Hopf saddle-node bifurcation for fixed points of 3D-diffeomorphisms: Analysis of a resonance ‘bubble’

    NASA Astrophysics Data System (ADS)

    Broer, Henk; Simó, Carles; Vitolo, Renato

    2008-08-01

    The dynamics near a Hopf saddle-node bifurcation of fixed points of diffeomorphisms is analysed by means of a case study: a two-parameter model map G is constructed, such that at the central bifurcation the derivative has two complex conjugate eigenvalues of modulus one and one real eigenvalue equal to 1. To investigate the effect of resonances, the complex eigenvalues are selected to have a 1:5 resonance. It is shown that, near the origin of the parameter space, the family G has two secondary Hopf saddle-node bifurcations of period five points. A cone-like structure exists in the neighbourhood, formed by two surfaces of saddle-node and a surface of Hopf bifurcations. Quasi-periodic bifurcations of an invariant circle, forming a frayed boundary, are numerically shown to occur in model G. Along such Cantor-like boundary, an intricate bifurcation structure is detected near a 1:5 resonance gap. Subordinate quasi-periodic bifurcations are found nearby, suggesting the occurrence of a cascade of quasi-periodic bifurcations.

  14. "Raising the Point!": An Artistic Approach in Supporting a Community's Call to Action

    ERIC Educational Resources Information Center

    Mendez, Jason

    2013-01-01

    This article discusses the notion of action and personal agency. The author discusses his experiences constructing an arts installation that supported a grassroots effort to revitalize Hunts Point, a community in the South Bronx that is home to 11,000 families, eighteen waste transfer stations, 40% of New York City's sewage, all of the…

  15. Recognition of Hands-free Speech and Hand Pointing Action for Conversational TV

    E-print Network

    Takiguchi, Tetsuya

    a structure and components of a conversational television set(TV) to which we can ask anything, conversational TV 1. INTRODUCTION Digital contents are widely broadcasted to home television sets all overRecognition of Hands-free Speech and Hand Pointing Action for Conversational TV Yasuo Ariki Dept

  16. Corrective Action Investigation Plan for Corrective Action Unit 556: Dry Wells and Surface Release Points Nevada Test Site, Nevada (Draft), Revision 0

    SciTech Connect

    Grant Evenson

    2007-02-01

    Corrective Action Unit  (CAU) 556, Dry Wells and Surface Release Points, is located in Areas 6 and 25 of the Nevada Test Site, 65 miles northwest of Las Vegas, Nevada. Corrective Action Unit 556 is comprised of four corrective action sites (CASs) listed below: •06-20-04, National Cementers Dry Well •06-99-09, Birdwell Test Hole •25-60-03, E-MAD Stormwater Discharge and Piping •25-64-01, Vehicle Washdown and Drainage Pit These sites are being investigated because existing information on the nature and extent of potential contamination is insufficient to evaluate and recommend corrective action alternatives. Additional information will be obtained by conducting a corrective action investigation before evaluating corrective action alternatives and selecting the appropriate corrective action for each CAS. The results of the field investigation will support a defensible evaluation of viable corrective action alternatives that will be presented in the Corrective Action Decision Document.

  17. Fixed point theorems of GPS carrier phase ambiguity resolution and their application to massive network processing: Ambizap

    NASA Astrophysics Data System (ADS)

    Blewitt, Geoffrey

    2008-12-01

    Precise point positioning (PPP) has become popular for Global Positioning System (GPS) geodetic network analysis because for n stations, PPP has O(n) processing time, yet solutions closely approximate those of O(n3) full network analysis. Subsequent carrier phase ambiguity resolution (AR) further improves PPP precision and accuracy; however, full-network bootstrapping AR algorithms are O(n4), limiting single network solutions to n < 100. In this contribution, fixed point theorems of AR are derived and then used to develop "Ambizap," an O(n) algorithm designed to give results that closely approximate full network AR. Ambizap has been tested to n ? 2800 and proves to be O(n) in this range, adding only ˜50% to PPP processing time. Tests show that a 98-station network is resolved on a 3-GHz CPU in 7 min, versus 22 h using O(n4) AR methods. Ambizap features a novel network adjustment filter, producing solutions that precisely match O(n4) full network analysis. The resulting coordinates agree to ?1 mm with current AR methods, much smaller than the ˜3-mm RMS precision of PPP alone. A 2000-station global network can be ambiguity resolved in ˜2.5 h. Together with PPP, Ambizap enables rapid, multiple reanalysis of large networks (e.g., ˜1000-station EarthScope Plate Boundary Observatory) and facilitates the addition of extra stations to an existing network solution without need to reprocess all data. To meet future needs, PPP plus Ambizap is designed to handle ˜10,000 stations per day on a 3-GHz dual-CPU desktop PC.

  18. Post-Minkowski action for point particles and a helically symmetric binary solution

    E-print Network

    John L. Friedman; Koji Uryu

    2006-05-05

    Two Fokker actions and corresponding equations of motion are obtained for two point particles in a post-Minkowski framework, in which the field of each particle is given by the half-retarded + half-advanced solution to the linearized Einstein equations. The first action is parametrization invariant, the second a generalization of the affinely parametrized quadratic action for a relativistic particle. Expressions for a conserved 4-momentum and angular momentum tensor are obtained in terms of the particles' trajectories in this post-Minkowski approximation. A formal solution to the equations of motion is found for a binary system with circular orbits. For a bound system of this kind, the post-Minkowski solution is a toy model that omits nonlinear terms of relevant post-Newtonian order; and we also obtain a Fokker action that is accurate to first post-Newtonian order, by adding to the post-Minkowski action a term cubic in the particle masses. Curiously, the conserved energy and angular momentum associated with the Fokker action are each finite and well-defined for this bound 2-particle system despite the fact that the total energy and angular momentum of the radiation field diverge. Corresponding solutions and conserved quantities are found for two scalar charges (for electromagnetic charges we exhibit the solution found by Schild). For a broad class of parametrization-invariant Fokker actions and for the affinely parametrized action, binary systems with circular orbits satisfy the relation $dE = \\Omega dL$ (a form of the first law of thermodynamics), relating the energy, angular velocity and angular momentum of nearby equilibrium configurations.

  19. Closure Report for Corrective Action Unit 516: Septic Systems and Discharge Points

    SciTech Connect

    NSTec Environmental Restoration

    2007-02-01

    Corrective Action Unit (CAU) 516 is located in Areas 3, 6, and 22 of the Nevada Test Site. CAU 516 is listed in the Federal Facility Agreement and Consent Order of 1996 as Septic Systems and Discharge Points, and is comprised of six Corrective Action Sites (CASs): {sm_bullet} CAS 03-59-01, Bldg 3C-36 Septic System {sm_bullet} CAS 03-59-02, Bldg 3C-45 Septic System {sm_bullet} CAS 06-51-01, Sump and Piping {sm_bullet} CAS 06-51-02, Clay Pipe and Debris {sm_bullet} CAS 06-51-03, Clean Out Box and Piping {sm_bullet} CAS 22-19-04, Vehicle Decontamination Area The Nevada Division of Environmental Protection (NDEP)-approved corrective action alternative for CASs 06-51-02 and 22-19-04 is no further action. The NDEP-approved corrective action alternative for CASs 03-59-01, 03-59-02, 06-51-01, and 06-51-03 is clean closure. Closure activities included removing and disposing of total petroleum hydrocarbon (TPH)-impacted septic tank contents, septic tanks, distribution/clean out boxes, and piping. CAU 516 was closed in accordance with the NDEP-approved CAU 516 Corrective Action Plan (CAP). The closure activities specified in the CAP were based on the recommendations presented in the CAU 516 Corrective Action Decision Document (U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office, 2004). This Closure Report documents CAU 516 closure activities. During closure activities, approximately 186 tons of hydrocarbon waste in the form of TPH-impacted soil and debris, as well as 89 tons of construction debris, were generated and managed and disposed of appropriately. Waste minimization techniques, such as field screening of soil samples and the utilization of laboratory analysis to characterize and classify waste streams, were employed during the performance of closure work.

  20. Analogies between the Torque-Free Motion of a Rigid Body about a Fixed Point and Light Propagation in Anisotropic Media

    ERIC Educational Resources Information Center

    Bellver-Cebreros, Consuelo; Rodriguez-Danta, Marcelo

    2009-01-01

    An apparently unnoticed analogy between the torque-free motion of a rotating rigid body about a fixed point and the propagation of light in anisotropic media is stated. First, a new plane construction for visualizing this torque-free motion is proposed. This method uses an intrinsic representation alternative to angular momentum and independent of…

  1. MAT331 Exercises, Spring 14 set number 13 37. (expires 5/4) Find all the fixed points of the system

    E-print Network

    Sutherland, Scott

    MAT331 Exercises, Spring 14 set number 13 37. (expires 5/4) Find all the fixed points of the system mathematical methods. 38. (expires 5/4) Consider the differential equation z(t) = F(z(t)), where the vector z that is rigorous once we accept Maple results as incontrovertibly true.] 39. (expires 5/4) For the equation z = F

  2. 21-24 October 2001, New Paltz, New York W2001-1 A FIXED POINT SOLUTION FOR CONVOLVED AUDIO SOURCE SEPARATION

    E-print Network

    Mitianoudis, Nikolaos

    21-24 October 2001, New Paltz, New York W2001-1 A FIXED POINT SOLUTION FOR CONVOLVED AUDIO SOURCE London michael.davies@kcl.ac.uk ABSTRACT We examine the problem of blind audio source separation using Independent Component Analysis (ICA). In order to separate audio sources recorded in a real recording

  3. Strong Convergence Theorems for a Common Fixed Point of a Finite Family of Bregman Weak Relativity Nonexpansive Mappings in Reflexive Banach Spaces

    PubMed Central

    2014-01-01

    We introduce an iterative process for finding an element of a common fixed point of a finite family of Bregman weak relatively nonexpansive mappings. Our theorems improve and unify most of the results that have been proved for this important class of nonlinear operators. PMID:24757423

  4. From Emergency to Fix: Point-of-Use Water Filtration Technology in Colonias Along the United States-Mexico Border 

    E-print Network

    Vandewalle, Emily Lauren

    2014-04-30

    Small-scale decentralized facilities and technologies are rapidly becoming a dominant technological fix to deliver water to underserved populations in developing nations. This project examines the case of a university ...

  5. Centrifugal multiplexing fixed-volume dispenser on a plastic lab-on-a-disk for parallel biochemical single-end-point assays.

    PubMed

    La, Moonwoo; Park, Sang Min; Kim, Dong Sung

    2015-01-01

    In this study, a multiple sample dispenser for precisely metered fixed volumes was successfully designed, fabricated, and fully characterized on a plastic centrifugal lab-on-a-disk (LOD) for parallel biochemical single-end-point assays. The dispenser, namely, a centrifugal multiplexing fixed-volume dispenser (C-MUFID) was designed with microfluidic structures based on the theoretical modeling about a centrifugal circumferential filling flow. The designed LODs were fabricated with a polystyrene substrate through micromachining and they were thermally bonded with a flat substrate. Furthermore, six parallel metering and dispensing assays were conducted at the same fixed-volume (1.27??l) with a relative variation of ±0.02??l. Moreover, the samples were metered and dispensed at different sub-volumes. To visualize the metering and dispensing performances, the C-MUFID was integrated with a serpentine micromixer during parallel centrifugal mixing tests. Parallel biochemical single-end-point assays were successfully conducted on the developed LOD using a standard serum with albumin, glucose, and total protein reagents. The developed LOD could be widely applied to various biochemical single-end-point assays which require different volume ratios of the sample and reagent by controlling the design of the C-MUFID. The proposed LOD is feasible for point-of-care diagnostics because of its mass-producible structures, reliable metering/dispensing performance, and parallel biochemical single-end-point assays, which can identify numerous biochemical. PMID:25610516

  6. Evaluation of color spatio-temporal interest points for human action recognition.

    PubMed

    Everts, Ivo; van Gemert, Jan C; Gevers, Theo

    2014-04-01

    This paper considers the recognition of realistic human actions in videos based on spatio-temporal interest points (STIPs). Existing STIP-based action recognition approaches operate on intensity representations of the image data. Because of this, these approaches are sensitive to disturbing photometric phenomena, such as shadows and highlights. In addition, valuable information is neglected by discarding chromaticity from the photometric representation. These issues are addressed by color STIPs. Color STIPs are multichannel reformulations of STIP detectors and descriptors, for which we consider a number of chromatic and invariant representations derived from the opponent color space. Color STIPs are shown to outperform their intensity-based counterparts on the challenging UCF sports, UCF11 and UCF50 action recognition benchmarks by more than 5% on average, where most of the gain is due to the multichannel descriptors. In addition, the results show that color STIPs are currently the single best low-level feature choice for STIP-based approaches to human action recognition. PMID:24577192

  7. state that disciplinary action may be taken if a trigger point is hit for

    E-print Network

    Daley, Monica A.

    state that disciplinary action may be taken if a trigger point is hit for 3rd time ask OH nO further actIOn Other than tO cOntInuOusLy mOnItOr absence nO braDfOrD trIGGer hIt nO braDfOrD trIGGer hIt nO braDfOrD trIGGer hIt staGe 1 staGe 2 fOLLOWs a 1st reVIeW meetInG staGe 3 fOLLOWs a 2nD reVIeW meet

  8. A Nondestructive Evaluation Method: Measuring the Fixed Strength of Spot-Welded Joint Points by Surface Electrical Resistivity.

    PubMed

    Shimamoto, Akira; Yamashita, Keitaro; Inoue, Hirofumi; Yang, Sung-Mo; Iwata, Masahiro; Ike, Natsuko

    2013-04-01

    Destructive tests are generally applied to evaluate the fixed strength of spot-welding nuggets of zinc-plated steel (which is a widely used primary structural material for automobiles). These destructive tests, however, are expensive and time-consuming. This paper proposes a nondestructive method for evaluating the fixed strength of the welded joints using surface electrical resistance. A direct current nugget-tester and probes have been developed by the authors for this purpose. The proposed nondestructive method uses the relative decrease in surface electrical resistance, ?. The proposed method also considers the effect of the corona bond. The nugget diameter is estimated by two factors: R Quota, which is calculated from variation of resistance, and a constant that represents the area of the corona bond. Since the maximum tensile strength is correlated with the nugget diameter, it can be inferred from the estimated nugget diameter. When appropriate measuring conditions for the surface electrical resistance are chosen, the proposed method can effectively evaluate the fixed strength of the spot-welded joints even if the steel sheet is zinc-plated. PMID:24891747

  9. Corrective Action Investigation Plan for Corrective Action Unit 516: Septic Systems and Discharge Points, Nevada Test Site, Nevada, Rev. 0, Including Record of Technical Change No. 1

    SciTech Connect

    U.S. Department of Energy , National Nuclear Security Administration Nevada Sites Office

    2003-04-28

    This Corrective Action Investigation Plan (CAIP) contains the U.S. Department of Energy (DOE), National Nuclear Security Administration Nevada Sites Office's (NNSA/NSO's) approach to collect the data necessary to evaluate corrective action alternatives appropriate for the closure of Corrective Action Unit (CAU) 516, Septic Systems and Discharge Points, Nevada Test Site (NTS), Nevada, under the Federal Facility Agreement and Consent Order. CAU 516 consists of six Corrective Action Sites: 03-59-01, Building 3C-36 Septic System; 03-59-02, Building 3C-45 Septic System; 06-51-01, Sump Piping, 06-51-02, Clay Pipe and Debris; 06-51-03, Clean Out Box and Piping; and 22-19-04, Vehicle Decontamination Area. Located in Areas 3, 6, and 22 of the NTS, CAU 516 is being investigated because disposed waste may be present without appropriate controls, and hazardous and/or radioactive constituents may be present or migrating at concentrations and locations that could potentially pose a threat to human health and the environment. Existing information and process knowledge on the expected nature and extent of contamination of CAU 516 are insufficient to select preferred corrective action alternatives; therefore, additional information will be obtained by conducting a corrective action investigation. The results of this field investigation will support a defensible evaluation of corrective action alternatives in the corrective action decision document. Record of Technical Change No. 1 is dated 3/2004.

  10. Corrective Action Decision Document for Corrective Action Unit 516: Septic Systems and Discharge Points, Nevada Test Site, Nevada, Rev. No.: 1 with ROTC 1

    SciTech Connect

    Alfred N. Wickline

    2004-04-01

    This Corrective Action Decision Document (CADD) has been prepared for Corrective Action Unit (CAU) 516, Septic Systems and Discharge Points, Nevada Test Site, Nevada, in accordance with the ''Federal Facility Agreement and Consent Order'' (1996). Corrective Action Unit 516 is comprised of the following Corrective Action Sites (CASs): (1) 03-59-01 - Bldg 3C-36 Septic System; (2) 03-59-02 - Bldg 3C-45 Septic System; (3) 06-51-01 - Sump and Piping; (4) 06-51-02 - Clay Pipe and Debris; (5) 06-51-03 - Clean Out Box and Piping; and (7) 22-19-04 - Vehicle Decontamination Area. The purpose of this CADD is to identify and provide the rationale for the recommendation of an acceptable corrective action alternative for each CAS within CAU 516. Corrective action investigation activities were performed between July 22 and August 14, 2003, as set forth in the Corrective Action Investigation Plan. Supplemental sampling was conducted in late 2003 and early 2004.

  11. The optimal launching of a space vehicle from the surface of the moon to a fixed point on the circular orbit of its artificial satellite

    NASA Astrophysics Data System (ADS)

    Grigor'ev, K. G.; Zapletina, E. V.; Zapletin, M. P.

    1992-06-01

    The paper presents an analysis and results of a numerical solution, based on the maximum principle, of three types of problems concerning the optimal launching of a space vehicle with a high-thrust rocket engine from the lunar surface to a fixed point on the circular orbit of a lunar artificial satellite. Attention is given to the problems of the fastest possible launching time, launching with minimal mass expenditure, and minimal trade-off functional (a compromise between expenditures for launch time and mass). The shooting method is used to obtain exact numerical solutions for the appropriate maximum principle boundary problems.

  12. Communicative and noncommunicative point-light actions featuring high-resolution representation of the hands and fingers.

    PubMed

    Zaini, Hazlin; Fawcett, Jonathan M; White, Nicole C; Newman, Aaron J

    2013-06-01

    We describe the creation of a set of point-light movies depicting 43 communicative gestures and 43 noncommunicative, pantomimed actions. These actions were recorded using a motion capture system that is worn on the body and provides accurate capture of the positions and movements of individual fingers. The movies created thus include point-lights on the fingers, allowing for representation of actions and gestures that would not be possible with a conventional, line-of-sight-based motion capture system. These videos would be suitable for use in cognitive and cognitive neuroscientific studies of biological motion and gesture perception. Each video is described, along with an H statistic indicating the consistency of the descriptive labels that 20 observers gave to the actions. We also produced a scrambled version of each movie, in which the starting position of each point was randomized but its local motion vector was preserved. These scrambled movies would be suitable for use as control stimuli in experimental studies. As supplementary materials, we provide QuickTime movie files of each action, along with text files specifying the three-dimensional coordinates of each point-light in each frame of each movie. PMID:23073730

  13. Patterns of hypermetria and terminal cocontraction during point-to-point movements demonstrate independent action of trajectory and postural controllers

    PubMed Central

    Ghez, Claude; Asnani, Supriya

    2011-01-01

    We examined elbow muscle activities and movement kinematics to determine how subjects combine elementary control actions in performing movements with one and two trajectory segments. In reaching, subjects made a rapid elbow flexion to a visual target before stabilizing the limb with either a low or a higher level of elbow flexor/extensor coactivity (CoA), which was cued by target diameter. Cursor diameter provided real-time biofeedback of actual muscle CoA. In reversing, the limb was to reverse direction within the target and return to the origin with minimal CoA. We previously reported that subjects overshoot the goal when attempting a reversal after first having learned to reach accurately to the same target. Here we test the hypothesis that this hypermetria results because reversals co-opt the initial feedforward control action from the preceding trained reach, thereby failing to account for task-dependent changes in limb impedance induced by differences in flexor/extensor coactivity as the target is acquired (higher in reaching than reversing). Instructed increases in elbow CoA began mid-reach, thus increasing elbow impedance and reducing transient oscillations present in low CoA movments. Flexor EMG alone increased at movement onset. Test reversals incorporated the initial agonist activity of previous reaches but not the increased coactivity at the target, thus leading to overshoot. Moreover, we observed elevated coactivity in reversals upon returning to the origin even though coactivity in reaching was centered at the goal target. These findings refute the idea that the brain necessarily invokes distinct unitary control actions for reaches and reversals made to the same target. Instead, reaches and reversals share a common control action that initiates trajectories toward their target and another later control action that terminates movement and stabilizes the limb about its final resting posture, which differs in the two tasks. PMID:21849613

  14. Zinc-Bismuth and Aluminum-Indium Monotectic Alloy-Based Fixed-Point Cells with Double Phase Transition for In Situ Calibration of Thermocouples

    NASA Astrophysics Data System (ADS)

    Lowe, Dave; Kodwani, Darsh

    2015-07-01

    Re-calibration of a thermocouple after it has been installed in a process is often not practical. In situ monitoring of performance is desirable and can be done with built-in reference standards based on melting or freezing phase transitions. Binary alloys with a monotectic reaction frequently have two invariant melt/freeze phase transitions taking place in the same material over a range of compositions. This makes them potentially well suited to be in situ temperature calibration artifacts, enabling correction for thermocouple drift without the need to disturb the thermocouple. A zinc-bismuth fixed-point cell was constructed and has been shown to be stable with two well-defined melting plateaus at nominally 255° C and 415° C. Two miniature fixed-point cells (each designed to be permanently installed with a thermocouple) based on zinc-bismuth and aluminum-indium alloys were made. Measurements have shown that the phase transitions can be identified despite the small quantity of metals used and that the alloys were sufficiently stable to have the potential to provide improved long-term confidence in process control and monitoring.

  15. Action and Emotion Recognition from Point Light Displays: An Investigation of Gender Differences

    PubMed Central

    Alaerts, Kaat; Nackaerts, Evelien; Meyns, Pieter; Swinnen, Stephan P.; Wenderoth, Nicole

    2011-01-01

    Folk psychology advocates the existence of gender differences in socio-cognitive functions such as ‘reading’ the mental states of others or discerning subtle differences in body-language. A female advantage has been demonstrated for emotion recognition from facial expressions, but virtually nothing is known about gender differences in recognizing bodily stimuli or body language. The aim of the present study was to investigate potential gender differences in a series of tasks, involving the recognition of distinct features from point light displays (PLDs) depicting bodily movements of a male and female actor. Although recognition scores were considerably high at the overall group level, female participants were more accurate than males in recognizing the depicted actions from PLDs. Response times were significantly higher for males compared to females on PLD recognition tasks involving (i) the general recognition of ‘biological motion’ versus ‘non-biological’ (or ‘scrambled’ motion); or (ii) the recognition of the ‘emotional state’ of the PLD-figures. No gender differences were revealed for a control test (involving the identification of a color change in one of the dots) and for recognizing the gender of the PLD-figure. In addition, previous findings of a female advantage on a facial emotion recognition test (the ‘Reading the Mind in the Eyes Test’ (Baron-Cohen, 2001)) were replicated in this study. Interestingly, a strong correlation was revealed between emotion recognition from bodily PLDs versus facial cues. This relationship indicates that inter-individual or gender-dependent differences in recognizing emotions are relatively generalized across facial and bodily emotion perception. Moreover, the tight correlation between a subject's ability to discern subtle emotional cues from PLDs and the subject's ability to basically discriminate biological from non-biological motion provides indications that differences in emotion recognition may - at least to some degree – be related to more basic differences in processing biological motion per se. PMID:21695266

  16. Action and emotion recognition from point light displays: an investigation of gender differences.

    PubMed

    Alaerts, Kaat; Nackaerts, Evelien; Meyns, Pieter; Swinnen, Stephan P; Wenderoth, Nicole

    2011-01-01

    Folk psychology advocates the existence of gender differences in socio-cognitive functions such as 'reading' the mental states of others or discerning subtle differences in body-language. A female advantage has been demonstrated for emotion recognition from facial expressions, but virtually nothing is known about gender differences in recognizing bodily stimuli or body language. The aim of the present study was to investigate potential gender differences in a series of tasks, involving the recognition of distinct features from point light displays (PLDs) depicting bodily movements of a male and female actor. Although recognition scores were considerably high at the overall group level, female participants were more accurate than males in recognizing the depicted actions from PLDs. Response times were significantly higher for males compared to females on PLD recognition tasks involving (i) the general recognition of 'biological motion' versus 'non-biological' (or 'scrambled' motion); or (ii) the recognition of the 'emotional state' of the PLD-figures. No gender differences were revealed for a control test (involving the identification of a color change in one of the dots) and for recognizing the gender of the PLD-figure. In addition, previous findings of a female advantage on a facial emotion recognition test (the 'Reading the Mind in the Eyes Test' (Baron-Cohen, 2001)) were replicated in this study. Interestingly, a strong correlation was revealed between emotion recognition from bodily PLDs versus facial cues. This relationship indicates that inter-individual or gender-dependent differences in recognizing emotions are relatively generalized across facial and bodily emotion perception. Moreover, the tight correlation between a subject's ability to discern subtle emotional cues from PLDs and the subject's ability to basically discriminate biological from non-biological motion provides indications that differences in emotion recognition may - at least to some degree - be related to more basic differences in processing biological motion per se. PMID:21695266

  17. Emergent infinite-randomness fixed points from the extensive random bipartitions of the spin-1 Affleck-Kennedy-Lieb-Tasaki topological state

    E-print Network

    Min Lu; Rajesh Narayanan; Xin Wan; Guang-Ming Zhang

    2015-02-07

    Quantum entanglement under an extensive bipartition can reveal the critical boundary theory of a topological phase in the parameter space. In this study we demonstrate that the infinite-randomness fixed point for spin-1/2 degrees of freedom can emerge from an extensive random bipartition of the spin-1 Affleck-Kennedy-Lieb-Tasaki chain. The nested entanglement entropy of the ground state of the reduced density matrix exhibits a logarithmic scaling with an effective central charge $\\tilde{c} = 0.72 \\pm 0.02 \\approx \\ln 2$. We further discuss, in the language of bulk quantum entanglement, how to understand all phase boundaries and the surrounding Griffiths phases for the antiferromagnetic Heisenberg spin-1 chain with quenched disorder and dimerization.

  18. Corrective Action Decision Document/ Closure Report for Corrective Action Unit 556: Dry Wells and Surface Release Points, Nevada Test Site, Nevada with Errata Sheet, Revision 0

    SciTech Connect

    Grant Evenson

    2008-09-01

    This Corrective Action Decision Document (CADD)/Closure Report (CR) has been prepared for Corrective Action Unit 556, Dry Wells and Surface Release Points, located at the Nevada Test Site, Nevada, in accordance with the Federal Facility Agreement and Consent Order (FFACO, 1996; as amended February 2008). Corrective Action Unit (CAU) 556 is comprised of four corrective action sites (CASs): • 06-20-04, National Cementers Dry Well • 06-99-09, Birdwell Test Hole • 25-60-03, E-MAD Stormwater Discharge and Piping • 25-64-01, Vehicle Washdown and Drainage Pit The purpose of this CADD/CR is to provide justification and documentation supporting the recommendation for closure of CAU 556 with no further corrective action. To achieve this, corrective action investigation (CAI) activities began on February 7 and were completed on June 19, 2008, as set forth in the Corrective Action Investigation Plan for Corrective Action Unit 556: Dry Wells and Surface Release Points, Nevada Test Site, Nevada (NNSA/NSO, 2007). The purpose of the CAI was to fulfill the following data needs as defined during the data quality objective (DQO) process: • Determine whether contaminants of concern (COCs) are present. • If COCs are present, determine their nature and extent. • Provide sufficient information and data to complete appropriate corrective actions. The CAU 556 data were evaluated based on the data quality assessment process, which demonstrated the quality and acceptability of the data for use in fulfilling the DQO data needs. Analytes detected during the CAI were evaluated against appropriate final action levels (FALs) to identify the COCs for each CAS. The results of the CAI identified COCs at one of the four CASs in CAU 556 that required the completion of a corrective action. Assessment of the data generated from investigation activities conducted at CAU 556 revealed the following: • Corrective Action Sites 06-20-04, 06-99-09, and 25-64-01 do not contain contamination at concentrations exceeding the FALs. • Polychlorinated biphenyl (PCB) contamination above the FAL was identified in the surface and/or shallow subsurface soils at the outfall and around Catch Basin 2, and in soils contained within the catch basins and the manhole at CAS 25-60-03. A corrective action of close in place with a soil removal action and use restriction (UR) was completed at CAS 25-60-03. The PCB-contaminated soils were removed from the outfall area and around Catch Basin 2, and disposed of at a Nevada Test Site landfill as part of a removal action. The catch basins and the manhole were sealed shut by filling them with grout. The end of the outfall pipe was plugged using grout, covered with soil, and the area was regraded. A UR was applied to the entire stormwater system at CAS 25-60-03, which includes the three catch basins, manhole, and associated piping. No further action is the corrective action for CASs 06-20-04, 06-99-09, and 25-64-01. The liquids in the test holes at CAS 06-99-09 were removed for disposal and the features were filled with grout as a best management practice. The drainage pipe between the vehicle washdown pad and the drainage pit at CAS 25-64-01 was sealed at each end as a best management practice. The corrective actions were evaluated on technical merit focusing on performance, reliability, feasibility, safety, and cost. They were judged to meet all requirements for the technical components evaluated. The corrective actions meet all applicable federal and state regulations for closure of the site and will reduce potential exposure pathways to the contaminated media to an acceptable level at CAU 556. Therefore, the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office provides the following recommendations: • Maintain a UR for the entire stormwater drainage system (i.e., three catch basins, one manhole, and associated piping) at CAS 25-60-03. • No further corrective action for CAU 556. • A Notice of Completion to the U.S. Department of Energy, National Nuclear Security Administration Nevada

  19. Infants' Understanding of Looking, Pointing, and Reaching as Cues to Goal-Directed Action

    ERIC Educational Resources Information Center

    Sodian, Beate; Thoermer, Claudia

    2004-01-01

    Phillips, Wellman, and Spelke (2002) provided experimental evidence indicating that by the age of 12 months infants use information about an adult's gaze-direction and emotional expression to predict action. We investigate the generality of this ability, using Phillips et al.'s paradigm across different referential gestures. If infants have a rich…

  20. Skilled players' and novices' difficulty anticipating left- vs. right-handed opponents' action intentions varies across different points in time.

    PubMed

    Loffing, Florian; Hagemann, Norbert; Schorer, Jörg; Baker, Joseph

    2015-04-01

    A left-handers' performance advantage in interactive sports is assumed to result from their relative rarity compared to right-handers. Part of this advantage may be explained by athletes facing difficulties anticipating left-handers' action intentions, particularly when anticipation is based on kinematic cues available at an early stage of an opponent's movement. Here we tested whether the type of volleyball attack is predicted better against right- vs. left-handed opponents' movements and whether such handedness effects are evident at earlier time points in skilled players than novices. In a video-based experiment volleyball players and novices predicted the type of shot (i.e., smash vs. lob) of left- and right-handed volleyball attacks occluded at six different time points. Overall, right-handed attacks were better anticipated than left-handed attacks, volleyball players outperformed novices, and performance improved in later occlusion conditions. Moreover, in skilled players the handedness effect was most pronounced when attacks were occluded 480 ms prior to hand-ball-contact, whereas in novices it was most evident 240 ms prior to hand-ball-contact. Our findings provide further evidence of the effect of an opponent's handedness on action outcome anticipation and suggest that its occurrence in the course of an opponent's unfolding action likely depends on an observers' domain-specific skill. PMID:25689236

  1. Action Research on Underpinnings for Physics by Jeffrey Hengesbach, Mountain Pointe High School, Tempe, Arizona

    E-print Network

    Steinberg, Richard N.

    of us are responsible for the training of fellow teachers, both within our schools and districts profession. As a scientist looking at this data, three points come to mind. First: The perception of physics edition of the textbook by way of training support. And you can forget upgrade and advanced training

  2. Recommendations for Action Points from BSD Postdoctoral Survey 2007 Rifat Hasina and Benjamin Wolfe

    E-print Network

    available to them to aid in their career development. As for the PDA, more than one of the PDA by acting as a central source of information for our fellow postdocs. In order to ensure that all Points: #12;1) Disseminate information concerning alternative careers in the sciences to the BSD

  3. Influences of diurnal sampling bias on fixed-point monitoring of plankton biodiversity determined using a massively parallel sequencing-based technique.

    PubMed

    Nagai, Satoshi; Hida, Kohsuke; Urushizaki, Shingo; Onitsuka, Goh; Yasuike, Motoshige; Nakamura, Yoji; Fujiwara, Atushi; Tajimi, Seisuke; Kimoto, Katsunori; Kobayashi, Takanori; Gojobori, Takashi; Ototake, Mitsuru

    2016-02-01

    In this study, we investigated the influence of diurnal sampling bias on the community structure of plankton by comparing the biodiversity among seawater samples (n=9) obtained every 3h for 24h by using massively parallel sequencing (MPS)-based plankton monitoring at a fixed point conducted at Himedo seaport in Yatsushiro Sea, Japan. The number of raw operational taxonomy units (OTUs) and OTUs after re-sampling was 507-658 (558±104, mean±standard deviation) and 448-544 (467±81), respectively, indicating high plankton biodiversity at the sampling location. The relative abundance of the top 20 OTUs in the samples from Himedo seaport was 48.8-67.7% (58.0±5.8%), and the highest-ranked OTU was Pseudo-nitzschia species (Bacillariophyta) with a relative abundance of 17.3-39.2%, followed by Oithona sp. 1 and Oithona sp. 2 (Arthropoda). During seawater sampling, the semidiurnal tidal current having an amplitude of 0.3ms(-1) was dominant, and the westward residual current driven by the northeasterly wind was continuously observed during the 24-h monitoring. Therefore, the relative abundance of plankton species apparently fluctuated among the samples, but no significant difference was noted according to G-test (p>0.05). Significant differences were observed between the samples obtained from a different locality (Kusuura in Yatsushiro Sea) and at different dates, suggesting that the influence of diurnal sampling bias on plankton diversity, determined using the MPS-based survey, was not significant and acceptable. PMID:26475937

  4. Carbonate chemistry and air-sea CO2 flux at a fixed point in a NW Mediterranean Bay, Villefranche-sur-Mer, France

    NASA Astrophysics Data System (ADS)

    De Carlo, E. H.; Mousseau, L.; Passafiume, O.; Drupp, P. S.; Gattuso, J.

    2011-12-01

    The purpose of the Service d'Observation de la Rade de Villefranche-sur-Mer (SO-RADE) is to study the temporal variability of hydrological conditions as well as the abundance and composition of holo- and meroplankton at a fixed station in the bay of Villefranche-sur-Mer, North West Mediterranean. The weekly data collected at this site, designated as "Point B (43° 41.10'N - 7° 18.94'E), since 1957 are recognized as a long-term time series describing the evolution of the hydrological conditions in a coastal environment. Since 2007, historical measurements of hydrological and biological conditions have been complemented by measurements of the CO2-carbonate system parameters. In this contribution we present CO2-carbonate system parameters and ancillary data for the period 2007-2010. The data are evaluated in the context of the physical and biogeochemical processes that contribute to the fluxes of CO2 between the ocean and atmosphere. Seasonal cycles of seawater pCO2 are controlled principally by variations in temperature, showing maxima in the summer and minima during the winters. Normalization of pCO2 to the mean seawater temperature (18oC) results in an apparent reversal of the seasonal cycle with maxima observed in the winters and minima in the summers, consistent with a control of pCO2 by primary productivity. Calculations of "instantaneous fluxes" of CO2 between the ocean and atmosphere show this area to be primarily a weak source of CO2 to the atmosphere during the summer and a weak sink during the winter and near neutral overall (range: -0.3 to +0.3 mmol CO2 m-2 h-1, average: 0.02 mmol CO2 m-2 h-1). We will also provide projections of errors incurred from the estimation of annualized fluxes of CO2 based on weekly measurements relative to daily and high-frequency (3 h) data such as those obtained at the Hawaii Kilo Nalu coastal time series station, which shows similar behavior to the Point B location despite significant differences in climate and hydrological conditions and the presence of a coral reef ecosystem.

  5. Dissemination of developed in VNIIOFI high temperature Fix-points based on Metal-Carbon Eutectics for Space Applications of ultra-precise Radiometry and Spectral Radiation Thermometry Measurements

    NASA Astrophysics Data System (ADS)

    Sapritsky, V.; Ogarev, S.; Khlevnoy, B.

    Several fixed-point cells (with 2 and 4 mm apertures for spectral-radiance application, and with 8 and 10 mm apertures (for the spectral irradiance measurements) have been designed and investigated at VNIIOFI consisted of a high- purity graphite crucibles containing Re-C ingots with nominal total impurity levels of 5,5N at the eutectic composition(s). It was investigated that fix-point reproducibility (freezing plateau level for all measured cells) was up to 0.01...0.02% between series of measurements / crucibles, and 0.002...0.004% within a sample measurement session, i.e. better than 100 mK. Measurements of high-temperature fixed points blackbodies based on Ir-C and Re-C eutectics were carried out to investigate their applicability as radiation sources for precision photometry and radiometry, in particular for astronomy and space applications, like long-term measurements of solar variability, etc. The measurement results encourage that the utilization of a new series of a high-temperature fix-point sources hand in hand with cryo-radiometer detector could cardinally change the situation in reproduction of spectral radiance, irradiance and temperature international scales. Several more high-temperature eutectics (e.g. TiC-C metal- carbon eutectics with T = 3057 C) are being investigated further for use as high- temperature fixed-point radiance and irradiance sources in o der to increase ther accuracy of radiometric and radiance-temperature scales above the conventionally assigned values of temperatures of ITS-90.

  6. Equivalence of Wilson actions

    NASA Astrophysics Data System (ADS)

    Sonoda, H.

    2015-10-01

    We introduce the concept of equivalence among Wilson actions. Applying the concept to a real scalar theory on a Euclidean space, we derive the exact renormalization group transformation of K. G. Wilson, and give a simple proof of universality of the critical exponents at any fixed point of the exact renormalization group transformation. We also show how to reduce the original formalism of Wilson to the simplified formalism by J. Polchinski.

  7. Creating a tipping point: Texas obesity policy actions in review, 2000-2010.

    PubMed

    Ory, Marcia G; Nichols, Donna; Dickerson, Justin B; Madsen, Klaus Krøyer; Dowdy, Diane M; Menendez, Tiffni; Miller, Camille; Hoelscher, Deanna M

    2013-01-01

    This paper discusses the historical context and current challenges of obesity prevention and control initiatives in Texas to understand how the obesity epidemic has been addressed by multiple interacting stakeholders over the past decade. By reviewing state reports and interviewing key decision makers, this paper chronicles recent efforts in Texas by highlighting health policy initiatives and champions who helped to create the foundation for obesity prevention and control. The findings outline the sentinel policy approaches that were implemented by public/private sector partnerships over the last decade, as well as the public figures that have been singular champions in creating the momentum for these changes. The efforts to address obesity with a collaborative approach in Texas have shown initial promise in creating a tipping point to control the obesity epidemic. These strategies can also serve as a model for obesity prevention and control at the national level. PMID:24375183

  8. Use of GNSS data for Hydrology: Applications of the method PPP (Precise Point Positioning) with integer ambiguities fixing for hydrological studies in the Amazon basin

    NASA Astrophysics Data System (ADS)

    Moreira, D. M.; Calmant, S.; Perosanz, F.; Santos, A.; Santos Da Silva, J.; Seyler, F.; Ramillien, G. L.; Monteiro, A.; Rotunno, O.; Shum, C.

    2011-12-01

    Applications of GNSS data is constantly being used in hydrology. One of the key applications is the characterization of river's longitudinal profiles, an information required to develop hydrological and hydrodynamic studies and to evaluate the quality of data obtained through space altimetry techniques. Some factors illustrate the challenge of establishing quality altimetry data from a GNSS receivers to obtain rivers profiles in Amazon Basin. GNSS reference network is sparse, the distance between survey points and reference stations is large, rivers have an extension of several thousands of kilometers. All these factors contribute in limiting the efficiency of classical techniques of GNSS data processing like double difference. In the present work we use the Gins-PC software developed at CNES / GRGS. We discuss the capability of the PPP kinematic with integer ambiguities fixing strategy implemented in GINS-PC in processing GPS data to calculate river's longitudinal profiles in the Amazon Basin. The profiles will be processed using data obtained from GPS receivers on boarding boats along the rivers of Amazon Basin such as Negro river, Madeira river and Amazon/Solimões river. For this purpose, field campaings were conducted between 2005 and 2010 by ANA ( Brazilian National Water Agency), CPRM (Brazilian Geologic Survey), IRD (French Institute of Research by Development), Hybam ( Hydrology of Amazon Basin), PROSUL (Research project by CNPQ/UFRJ) and FOAM (From Ocean to inland waters Altimetry Monitoring) river section project. Under the proposed framework, these profiles will be then compared with profiles obtained by water level variation data using altimetry data from tracks of the Jason-2 and ENVISAT missions. The profiles will be also used to levelling some gauge stations in Amazon Basin and gauge data will be used to obtain a temporal variation of these profiles. However some gauges are strongly affected by charge effects, mainly caused by the hydrological cycle of the Amazon basin. These effects can produce a variation of about 10 cm in amplitude of vertical coordinates also obtained by GPS. Therefore, we use GRACE data to convert the hydrologic load into crustal displacements to remove these effects.

  9. The Anti-Inflammatory Actions of Auricular Point Acupressure for Chronic Low Back Pain

    PubMed Central

    Lin, Wei-Chun; Yeh, Chao Hsing; Chien, Lung-Chang; Morone, Natalia E.; Glick, Ronald M.; Albers, Kathryn M.

    2015-01-01

    Background. Auricular point acupressure (APA) is a promising treatment for pain management. Few studies have investigated the physiological mechanisms of APA analgesics. Method. In this pilot randomized clinical trial (RCT), a 4-week APA treatment was used to manage chronic low back pain (CLBP). Sixty-one participants were randomized into a real APA group (n = 32) or a sham APA group (n = 29). Blood samples, pain intensity, and physical function were collected at baseline and after 4 weeks of treatment. Results. Subjects in the real APA group reported a 56% reduction of pain intensity and a 26% improvement in physical function. Serum blood samples showed (1) a decrease in IL-1?, IL-2, IL-6, and calcitonin gene-related peptide [CGRP] and (2) an increase in IL-4. In contrast, subjects in the sham APA group (1) reported a 9% reduction in pain and a 2% improvement in physical function and (2) exhibited minimal changes of inflammatory cytokines and neuropeptides. Statistically significant differences in IL-4 and CGRP expression between the real and sham APA groups were verified. Conclusion. These findings suggest that APA treatment affects pain intensity through modulation of the immune system, as reflected by APA-induced changes in serum inflammatory cytokine and neuropeptide levels. PMID:26170869

  10. Physical meaning and a duality of concepts of wave function, action functional, entropy, the Pointing vector, the Einstein tensor

    E-print Network

    L. I. Petrova

    2010-01-11

    Physical meaning and a duality of concepts of wave function, action functional, entropy, the Pointing vector, the Einstein tensor and so on can be disclosed by investigating the state of material systems such as thermodynamic and gas dynamic systems, systems of charged particles, cosmologic systems and others. These concepts play a same role in mathematical physics. They are quantities that specify a state of material systems and also characteristics of physical fields. The duality of these concepts reveals in the fact that they can at once be both functionals and state functions or potentials. As functionals they are defined on nonintegrable manifold (for example, on tangent one), and as a state function they are defined on integrable manifold (for example, on cotangent one). The transition from functionals to state functions dicribes the mechanism of physical structure origination. The properties of these concepts can be studied by the example of entropy and action. The role of these concepts in mathematical physics and field theory will be demonstrated. Such results have been obtained by using skew-symmetric forms. In addition to exterior forms, the skew-symmetric forms, which are obtained from differential equations and, in distinction to exterior forms, are evolutionary ones and are defined on nonintegrable manifolds, were used.

  11. Corrective Action Investigation Plan for Corrective Action Unit 406: Area 3 Building 03-74 and Building 03-58 Under ground Discharge Points and Corrective Action Unit 429: Area 3 Building 03-55 and Area 9 Building 09-52 Underground Discharge Points, Tonopah Test Range, Nevada

    SciTech Connect

    DOE/NV

    1999-05-20

    This Corrective Action Investigation Plan (CAIP) has been developed in accordance with the Federal Facility Agreement and Consent Order (FFACO) that was agreed to by the US Department of Energy, Nevada Operations Office (DOE/NV); the State of Nevada Division of Environmental Protection (NDEP); and the US Department of Defense (FFACO, 1996). The CAIP is a document that provides or references all of the specific information for investigation activities associated with Corrective Action Units (CAUs) or Corrective Action Sites (CASs). According to the FFACO (1996), CASs are sites potentially requiring corrective action(s) and may include solid waste management units or individual disposal or release sites. Corrective Action Units consist of one or more CASs grouped together based on geography, technical similarity, or agency responsibility for the purpose of determining corrective actions. This CAIP contains the environmental sample collection objectives and the criteria for conducting site investigation activities at the Underground Discharge Points (UDPs) included in both CAU 406 and CAU 429. The CAUs are located in Area 3 and Area 9 of the Tonopah Test Range (TTR). The TTR, included in the Nellis Air Force Range, is approximately 255 kilometers (km) (140 miles [mi]) northwest of Las Vegas, Nevada.

  12. Genetic and molecular identification of three human TPP1 functions in telomerase action: recruitment, activation, and homeostasis set point regulation

    PubMed Central

    Sexton, Alec N.; Regalado, Samuel G.; Lai, Christine S.; Cost, Gregory J.; O’Neil, Colleen M.; Urnov, Fyodor D.; Gregory, Philip D.; Jaenisch, Rudolf

    2014-01-01

    Telomere length homeostasis is essential for the long-term survival of stem cells, and its set point determines the proliferative capacity of differentiated cell lineages by restricting the reservoir of telomeric repeats. Knockdown and overexpression studies in human tumor cells showed that the shelterin subunit TPP1 recruits telomerase to telomeres through a region termed the TEL patch. However, these studies do not resolve whether the TPP1 TEL patch is the only mechanism for telomerase recruitment and whether telomerase regulation studied in tumor cells is representative of nontransformed cells such as stem cells. Using genome engineering of human embryonic stem cells, which have physiological telomere length homeostasis, we establish that the TPP1 TEL patch is genetically essential for telomere elongation and thus long-term cell viability. Furthermore, genetic bypass, protein fusion, and intragenic complementation assays define two distinct additional mechanisms of TPP1 involvement in telomerase action at telomeres. We demonstrate that TPP1 provides an essential step of telomerase activation as well as feedback regulation of telomerase by telomere length, which is necessary to determine the appropriate telomere length set point in human embryonic stem cells. These studies reveal and resolve multiple TPP1 roles in telomere elongation and stem cell telomere length homeostasis. PMID:25128433

  13. Genetic and molecular identification of three human TPP1 functions in telomerase action: recruitment, activation, and homeostasis set point regulation.

    PubMed

    Sexton, Alec N; Regalado, Samuel G; Lai, Christine S; Cost, Gregory J; O'Neil, Colleen M; Urnov, Fyodor D; Gregory, Philip D; Jaenisch, Rudolf; Collins, Kathleen; Hockemeyer, Dirk

    2014-09-01

    Telomere length homeostasis is essential for the long-term survival of stem cells, and its set point determines the proliferative capacity of differentiated cell lineages by restricting the reservoir of telomeric repeats. Knockdown and overexpression studies in human tumor cells showed that the shelterin subunit TPP1 recruits telomerase to telomeres through a region termed the TEL patch. However, these studies do not resolve whether the TPP1 TEL patch is the only mechanism for telomerase recruitment and whether telomerase regulation studied in tumor cells is representative of nontransformed cells such as stem cells. Using genome engineering of human embryonic stem cells, which have physiological telomere length homeostasis, we establish that the TPP1 TEL patch is genetically essential for telomere elongation and thus long-term cell viability. Furthermore, genetic bypass, protein fusion, and intragenic complementation assays define two distinct additional mechanisms of TPP1 involvement in telomerase action at telomeres. We demonstrate that TPP1 provides an essential step of telomerase activation as well as feedback regulation of telomerase by telomere length, which is necessary to determine the appropriate telomere length set point in human embryonic stem cells. These studies reveal and resolve multiple TPP1 roles in telomere elongation and stem cell telomere length homeostasis. PMID:25128433

  14. IEEE TRANSACTIONS ON NEURAL NETWORKS, VOL. 14, NO. 4, JULY 2003 943 Monotonic Convergence of Fixed-Point Algorithms for ICA

    E-print Network

    Regalia, Phillip A.

    IEEE TRANSACTIONS ON NEURAL NETWORKS, VOL. 14, NO. 4, JULY 2003 943 Monotonic Convergence of Fixed 8, 2002. P. A. Regalia is with the Department of Communications, Image, and In- formation Processing signals contained in . More sophisticated models, involving convolutive mixtures and correlated back

  15. Action Imitation at 1.5 Years Is Better than Pointing Gesture in Predicting Late Development of Language Production at 3 Years of Age

    ERIC Educational Resources Information Center

    Zambrana, Imac M.; Ystrom, Eivind; Schjolberg, Synnve; Pons, Francisco

    2013-01-01

    This study examined whether poor pointing gestures and imitative actions at 18 months of age uniquely predicted late language production at 36 months, beyond the role of poor language at 18 months of age. Data from the Norwegian Mother and Child Cohort Study were utilized. Maternal reports of the children's nonverbal skills and language were…

  16. The Effects of Point-of-View Video Modeling on Symbolic Play Actions and Play-Associated Language Utterances in Preschoolers with Autism

    ERIC Educational Resources Information Center

    Bonnet, Lauren Kravetz

    2012-01-01

    This single-subject research study was designed to examine the effects of point-of-view video modeling (POVM) on the symbolic play actions and play-associated language of four preschool students with autism. A multiple baseline design across participants was conducted in order to evaluate the effectiveness of using POVM as an intervention for…

  17. Addendum to the Corrective Action Decision Document/Closure Report for Corrective Action Unit 406: Area 3 Building 03-74 & Building 03-58 Underground Discharge Points and Corrective Action Unit 429: Area 3 Building 03-55 & Area 9 Building 09-52 Underground Discharge Points, Tonopah Test Range, Nevada, Revision 0

    SciTech Connect

    Lynn Kidman

    2008-10-01

    This document constitutes an addendum to the March 2000, Corrective Action Decision Document / Closure Report for Corrective Action Unit 406: Area 3 Building 03-74 & 03-58 Underground Discharge Points and Corrective Action Unit 429: Area 3 Building 03-55 & Area 9 Building 09-52 Underground Discharge Points (TTR) as described in the document Recommendations and Justifications for Modifications for Use Restrictions Established under the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office Federal Facility Agreement and Consent Order (UR Modification document) dated February 2008. The UR Modification document was approved by NDEP on February 26, 2008. The approval of the UR Modification document constituted approval of each of the recommended UR modifications. In conformance with the UR Modification document, this addendum consists of: • This cover page that refers the reader to the UR Modification document for additional information • The cover and signature pages of the UR Modification document • The NDEP approval letter • The corresponding section of the UR Modification document This addendum provides the documentation justifying the cancellation of the UR for CAS 03-51-001-0355 – Photo Shop UDP, Drains in CAU 429. It should be noted that there are no changes to CAU 406. This UR was established as part of a Federal Facility Agreement and Consent Order (FFACO) corrective action and is based on the presence of contaminants at concentrations greater than the action levels established at the time of the initial investigation (FFACO, 1996; as amended August 2006). Since this UR was established, practices and procedures relating to the implementation of risk-based corrective actions (RBCA) have changed. Therefore, this UR was re-evaluated against the current RBCA criteria as defined in the Industrial Sites Project Establishment of Final Action Levels (NNSA/NSO, 2006c). This re-evaluation consisted of comparing the original data (used to define the need for the UR) to risk-based final action levels (FALs) developed using the current Industrial Sites RBCA process. The re-evaluation resulted in a recommendation to remove the UR because contamination is not present at the site above the risk-based FALs. Requirements for inspecting and maintaining this UR will be canceled, and the postings and signage at this site will be removed. Fencing and posting may be present at this site that are unrelated to the FFACO UR such as for radiological control purposes as required by the NV/YMP Radiological Control Manual (NNSA/NSO, 2004f). This modification will not affect or modify any non-FFACO requirements for fencing, posting, or monitoring at this site.

  18. Corrective Action Investigation Plan for Corrective Action Unit 262: Area 25 Septic Systems and Underground Discharge Point, Nevada Test Site, Nevada, Revision No. 1 (9/2001)

    SciTech Connect

    NNSA /NV

    2000-07-20

    This corrective action investigation plan contains the U.S. Department of Energy, Nevada Operations Office's approach to collect data necessary to evaluate corrective action alternatives appropriate for the closure of Corrective Action Unit (CAU) 262 under the Federal Facility Agreement and Consent Order. Corrective Action Unit 262 consists of nine Corrective Action Sites (CASs): Underground Storage Tank (25-02-06), Septic Systems A and B (25-04-06), Septic System (25-04-07), Leachfield (25-05-03), Leachfield (25-05-05), Leachfield (25-05-06), Radioactive Leachfield (25-05-08), Leachfield (25-05-12), and Dry Well (25-51-01). Situated in Area 25 at the Nevada Test Site (NTS), sites addressed by CAU 262 are located at the Reactor-Maintenance, Assembly, and Disassembly (R-MAD); Test Cell C; and Engine-Maintenance, Assembly, and Disassembly (E-MAD) facilities. The R-MAD, Test Cell C, and E-MAD facilities supported nuclear rocket reactor and engine testing as part of the Nuclear Rocket Development Station. The activities associated with the testing program were conducted between 1958 and 1973. Based on site history collected to support the Data Quality Objectives process, contaminants of potential concern (COPCs) for the site include oil/diesel-range total petroleum hydrocarbons, volatile organic compounds, semivolatile organic compounds, polychlorinated biphenyls, Resource Conservation and Recovery Act metals, and gamma-emitting radionuclides, isotopic uranium, isotopic plutonium, strontium-90, and tritium. The scope of the corrective action field investigation at the CAU will include the inspection of portions of the collection systems, sampling the contents of collection system features in situ of leachfield logging materials, surface soil sampling, collection of samples of soil underlying the base of inlet and outfall ends of septic tanks and outfall ends of diversion structures and distribution boxes, collection of soil samples from biased or a combination of biased and random locations within the boundaries of the leachfields, collection of soil samples at stepout locations (where needed) to further define lateral and vertical extent of contamination, conduction of discrete field screening, and logging of soil borings and collection of geotechnical samples to assess soil characteristics. Historical information indicates that significant quantities of radioactive material were produced during the rocket engine testing program, some of which was disposed of in radioactive waste disposal systems (posted leachfields) at each of these locations. Process and sanitary effluents were generated and disposed of in other leachfields. The results of this field investigation will be used to develop and evaluate corrective action alternatives for these CASs.

  19. Research and operational products from the combination of a monthly hydrographic station and an oceanic buoy: The Biscay AGL fixed-point water column observatory.

    NASA Astrophysics Data System (ADS)

    Lavin, Alicia; Cano, Daniel; González-Pola, Cesar; Tel, Elena; Rodriguez, Carmen; Ruiz, Manuel; Somavilla, Raquel

    2015-04-01

    Long term time series are an important tool for increasing the knowledge of ocean processes as well as for studying water masses variability in different time scales and changes and tendencies in marine ecosystems. Time series has been classically obtained by oceanographic ships that regularly cover standard sections and stations. From 1991, shelf and slope waters of the Southern Bay of Biscay are regularly sampled in a monthly hydrographic line north of Santander to a depth of 1000 m in early stages and for the whole water column down to 2580 m in recent times. Nearby, in June 2007, the IEO deployed an oceanic-meteorological buoy (AGL Buoy, 43° 50.67'N; 3° 46.20'W, and 40 km offshore, www.boya-agl.st.ieo.es). The long-term hydrographical record have allowed to define the seasonality, trends, and interannual variability at all levels, including the mixing layer and the main water masses North Atlantic Central Water and Mediterranean Water. The relation of these changes with high frequency surface conditions has been examined using the AGL buoy data from 2007 as well as satellite and reanalysis data. On that context and using that combination of sources, some products and quality controlled series of high interest and utility for scientific purposes have been developed and are offered hourly in the web page. Main products obtained are: SST and SSS anomalies, wave significant height character with respect to monthly average, and currents with respect to seasonal averages. Ocean-atmosphere heat fluxes (latent and sensible) are computed from the buoy atmospheric and oceanic measurements. Estimations of the mixed layer depth and bulk series at different water levels are provided in a monthly basis. Quality controlled series are provided for sea surface salinity, oxygen and chlorophyll data. Some sensors are particularly affected by biofouling, and monthly visits to the buoy permit to follow these sensors behaviour. Chlorophyll-fluorescence sensor is the main concern, but Dissolved Oxygen sensor is also problematic. Periods of realistic smooth variations present strong offset that is corrected based on the Winkler analysis of water samples. The incorporation of these observatories on larger scale research programs, as done in 2003 in the framework of the VACLAN and COVACLAN projects, is important in order to provide them with a larger spatial dimension and maximize its utility for process-oriented studies. In 2003, the Santander section was extended 90 miles offshore in the framework of a large-scale hydrographic and circulation monitoring program. Partnerships in a large EU project as FixO3 has provided tools for coordination, homogenization and data validation as well as improve the use of chemical-biological data.

  20. Addendum to the Closure Report for Corrective Action Unit 423: Area 3 Building 03-60 Underground Discharge Point, Tonopah Test Range, Nevada, Revision 0

    SciTech Connect

    Lynn Kidman

    2008-10-01

    This document constitutes an addendum to the July 1999, Closure Report for Corrective Action Unit 423: Area 3 Building 0360 Underground Discharge Point, Tonopah Test Range, Nevada as described in the document Recommendations and Justifications for Modifications for Use Restrictions Established under the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office Federal Facility Agreement and Consent Order (UR Modification document) dated February 2008. The UR Modification document was approved by NDEP on February 26, 2008. The approval of the UR Modification document constituted approval of each of the recommended UR modifications. In conformance with the UR Modification document, this addendum consists of: • This cover page that refers the reader to the UR Modification document for additional information • The cover and signature pages of the UR Modification document • The NDEP approval letter • The corresponding section of the UR Modification document This addendum provides the documentation justifying the cancellation of the UR for CAS 03-02-002-0308, Underground Discharge Point. This UR was established as part of a Federal Facility Agreement and Consent Order (FFACO) corrective action and is based on the presence of contaminants at concentrations greater than the action levels established at the time of the initial investigation (FFACO, 1996; as amended August 2006). Since this UR was established, practices and procedures relating to the implementation of risk-based corrective actions (RBCA) have changed. Therefore, this UR was re-evaluated against the current RBCA criteria as defined in the Industrial Sites Project Establishment of Final Action Levels (NNSA/NSO, 2006c). This re-evaluation consisted of comparing the original data (used to define the need for the UR) to risk-based final action levels (FALs) developed using the current Industrial Sites RBCA process. The re-evaluation resulted in a recommendation to remove the UR because contamination is not present at the site above the risk-based FALs. Requirements for inspecting and maintaining this UR will be canceled, and the postings and signage at this site will be removed. Fencing and posting may be present at this site that are unrelated to the FFACO UR such as for radiological control purposes as required by the NV/YMP Radiological Control Manual (NNSA/NSO, 2004f). This modification will not affect or modify any non-FFACO requirements for fencing, posting, or monitoring at this site.

  1. Alarm points for fixed oxygen monitors

    SciTech Connect

    Miller, G.C.

    1987-05-01

    Oxygen concentration monitors were installed in a vault where numerous pipes carried inert cryogens and gases to the Mirror Fusion Test Facility (MFTF-B) experimental vessel at Lawrence Livermore National Laboratory (LLNL). The problems associated with oxygen-monitoring systems and the reasons why such monitors were installed were reviewed. As a result of this review, the MFTF-B monitors were set to sound an evacuation alarm when the oxygen concentration fell below 18%. We chose the 18% alarm criterion to minimize false alarms and to allow time for personnel to escape in an oxygen-deficient environment.

  2. Fixed-Point-Like Theorems on Subspaces

    E-print Network

    Bich, Philippe; Cornet, Bernard

    2004-08-26

    , such that for every x ?Uki , F k i (x)= Fˆ k i (x). ? We now come back to the proof of Theorem 2.1 when J = ?. For every i ? I and k = 1, . . . ,ki, let Fˆki be the u.s.c. correspondence from M to Vi with nonempty convex (compact) values defined in Claim 3.5... with the precise definition of the manifold structure on Gk(V). 2.2. The main result and some consequences. The aim of this paper is to prove the following result. Theorem 2.1. Let I , J be two finite disjoint sets. For every i? I , let ki be an integer and let Vi...

  3. Journal of Fixed Point Theory and Applications

    E-print Network

    Côte, Raphaël

    -offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self and Evelyne Miot To our Professor Ha¨im Brezis on his 70th anniversary with esteem Abstract. We consider

  4. Biogenesis and mechanism of action of small non-coding RNAs: insights from the point of view of structural biology.

    PubMed

    Costa, Marina C; Leitão, Ana Lúcia; Enguita, Francisco J

    2012-01-01

    Non-coding RNAs are dominant in the genomic output of the higher organisms being not simply occasional transcripts with idiosyncratic functions, but constituting an extensive regulatory network. Among all the species of non-coding RNAs, small non-coding RNAs (miRNAs, siRNAs and piRNAs) have been shown to be in the core of the regulatory machinery of all the genomic output in eukaryotic cells. Small non-coding RNAs are produced by several pathways containing specialized enzymes that process RNA transcripts. The mechanism of action of these molecules is also ensured by a group of effector proteins that are commonly engaged within high molecular weight protein-RNA complexes. In the last decade, the contribution of structural biology has been essential to the dissection of the molecular mechanisms involved in the biosynthesis and function of small non-coding RNAs. PMID:22949860

  5. Algorithmic-Reducibility = Renormalization-Group Fixed-Points; ``Noise''-Induced Phase-Transitions (NITs) to Accelerate Algorithmics (``NIT-Picking'') Replacing CRUTCHES!!!: Gauss Modular/Clock-Arithmetic Congruences = Signal X Noise PRODUCTS..

    NASA Astrophysics Data System (ADS)

    Siegel, J.; Siegel, Edward Carl-Ludwig

    2011-03-01

    Cook-Levin computational-"complexity"(C-C) algorithmic-equivalence reduction-theorem reducibility equivalence to renormalization-(semi)-group phase-transitions critical-phenomena statistical-physics universality-classes fixed-points, is exploited with Gauss modular/clock-arithmetic/model congruences = signal X noise PRODUCT reinterpretation. Siegel-Baez FUZZYICS=CATEGORYICS(SON of ``TRIZ''): Category-Semantics(C-S) tabular list-format truth-table matrix analytics predicts and implements "noise"-induced phase-transitions (NITs) to accelerate versus to decelerate Harel [Algorithmics(1987)]-Sipser[Intro. Theory Computation(1997) algorithmic C-C: "NIT-picking" to optimize optimization-problems optimally(OOPO). Versus iso-"noise" power-spectrum quantitative-only amplitude/magnitude-only variation stochastic-resonance, this "NIT-picking" is "noise" power-spectrum QUALitative-type variation via quantitative critical-exponents variation. Computer-"science" algorithmic C-C models: Turing-machine, finite-state-models/automata, are identified as early-days once-workable but NOW ONLY LIMITING CRUTCHES IMPEDING latter-days new-insights!!!

  6. Final report on EURAMET.T-K3.5: Bilateral comparison of SPRT calibration at the ITS-90 Fixed Points of Ar, Hg, H2O, Ga, In, Sn, Zn and Al

    NASA Astrophysics Data System (ADS)

    Peruzzi, A.; Bruin-Barendregt, C.; Bosma, R.; Senn, R.

    2014-01-01

    ROTH+CO. AG (Switzerland) was designated by METAS for participation in the MRA in the field of thermometry. To demonstrate its technical competence, ROTH+CO. AG asked VSL (the Netherlands) for a bilateral comparison of SPRT calibration at the ITS-90 fixed points of Ar, Hg, H2O, Ga, In, Sn, Zn and Al. The comparison, designated as EURAMET.T-K3.5, was initiated in February 2013 (with the preparation of the technical protocol) and completed in July 2014 (with the CCT approval of the final report). The results showed a satisfactory degree of equivalence between VSL and ROTH+CO. AG, and were successfully linked to EUROMET.T-K3 and CCT-K3 key comparisons. As a consequence, ROTH+CO. AG is now able to support CMCs for the services covered by this comparison and publish them in the KCDB. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/. The final report has been peer-reviewed and approved for publication by the CCT, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

  7. Experimental study of the critical point region of aluminum under the action of the powerful nanosecond laser pulse

    NASA Astrophysics Data System (ADS)

    Cherepetskaya, E. B.; Karabutov, A. A.; Kaptilniy, A. G.; Ksenofontov, D. M.; Makarov, V. A.; Podymova, N. B.

    2015-12-01

    This paper is a report on the novel experimental method of the study of the thermodynamic parameters of thin aluminum films in the critical point region. The controlled supercritical state of aluminum is achieved for the first time as a result of the heating of these films by the absorption of the powerful nanosecond pulse of Q-switched Nd:YAG laser at the fundamental wavelength. The possibility is demonstrated to find simultaneously the temporal dependencies of the temperature, of the pressure and of the density of aluminum during the experiment with the thin aluminum films confined at both sides by the quartz glass substrates. These dependencies are obtained taking into account the nonlinear dependence on the incident laser intensity of the light reflection coefficient from the irradiated surface of aluminum. For the first time the thermodynamic cooling cycle of aluminum after its heating by the powerful nanosecond laser pulse is plotted in the space of variables’ temperature—pressure and temperature—density that get into the supercritical region.

  8. Full and partial gauge fixing

    SciTech Connect

    Shirzad, A.

    2007-08-15

    Gauge fixing may be done in different ways. We show that using the chain structure to describe a constrained system enables us to use either a full gauge, in which all gauged degrees of freedom are determined, or a partial gauge, in which some first class constraints remain as subsidiary conditions to be imposed on the solutions of the equations of motion. We also show that the number of constants of motion depends on the level in a constraint chain in which the gauge fixing condition is imposed. The relativistic point particle, electromagnetism, and the Polyakov string are discussed as examples and full or partial gauges are distinguished.

  9. Exact nilpotent nonperturbative BRST symmetry for the Gribov-Zwanziger action in the linear covariant gauge

    NASA Astrophysics Data System (ADS)

    Capri, M. A. L.; Fiorentini, D.; Guimaraes, M. S.; Mintz, B. W.; Palhares, L. F.; Sorella, S. P.; Dudal, D.; Justo, I. F.; Pereira, A. D.; Sobreiro, R. F.

    2015-08-01

    We point out the existence of a nonperturbative exact nilpotent BRST symmetry for the Gribov-Zwanziger action in the Landau gauge. We then put forward a manifestly BRST invariant resolution of the Gribov gauge fixing ambiguity in the linear covariant gauge.

  10. A proper fixed functional for four-dimensional Quantum Einstein Gravity

    NASA Astrophysics Data System (ADS)

    Demmel, Maximilian; Saueressig, Frank; Zanusso, Omar

    2015-08-01

    Realizing a quantum theory for gravity based on Asymptotic Safety hinges on the existence of a non-Gaussian fixed point of the theory's renormalization group flow. In this work, we use the functional renormalization group equation for the effective average action to study the fixed point underlying Quantum Einstein Gravity at the functional level including an infinite number of scale-dependent coupling constants. We formulate a list of guiding principles underlying the construction of a partial differential equation encoding the scale-dependence of f( R)-gravity. We show that this equation admits a unique, globally well-defined fixed functional describing the non-Gaussian fixed point at the level of functions of the scalar curvature. This solution is constructed explicitly via a numerical double-shooting method. In the UV, this solution is in good agreement with results from polynomial expansions including a finite number of coupling constants, while it scales proportional to R 2, dressed up with non-analytic terms, in the IR. We demonstrate that its structure is mainly governed by the conformal sector of the flow equation. The relation of our work to previous, partial constructions of similar scaling solutions is discussed.

  11. Comparison of toxicogenomics and traditional approaches to inform mode of action and points of departure in human health risk assessment of benzo[a]pyrene in drinking water

    PubMed Central

    Labib, Sarah; Bourdon-Lacombe, Julie; Kuo, Byron; Buick, Julie K.; Lemieux, France; Williams, Andrew; Halappanavar, Sabina; Malik, Amal; Luijten, Mirjam; Aubrecht, Jiri; Hyduke, Daniel R.; Fornace, Albert J.; Swartz, Carol D.; Recio, Leslie; Yauk, Carole L.

    2015-01-01

    Toxicogenomics is proposed to be a useful tool in human health risk assessment. However, a systematic comparison of traditional risk assessment approaches with those applying toxicogenomics has never been done. We conducted a case study to evaluate the utility of toxicogenomics in the risk assessment of benzo[a]pyrene (BaP), a well-studied carcinogen, for drinking water exposures. Our study was intended to compare methodologies, not to evaluate drinking water safety. We compared traditional (RA1), genomics-informed (RA2) and genomics-only (RA3) approaches. RA2 and RA3 applied toxicogenomics data from human cell cultures and mice exposed to BaP to determine if these data could provide insight into BaP's mode of action (MOA) and derive tissue-specific points of departure (POD). Our global gene expression analysis supported that BaP is genotoxic in mice and allowed the development of a detailed MOA. Toxicogenomics analysis in human lymphoblastoid TK6 cells demonstrated a high degree of consistency in perturbed pathways with animal tissues. Quantitatively, the PODs for traditional and transcriptional approaches were similar (liver 1.2 vs. 1.0 mg/kg-bw/day; lung 0.8 vs. 3.7 mg/kg-bw/day; forestomach 0.5 vs. 7.4 mg/kg-bw/day). RA3, which applied toxicogenomics in the absence of apical toxicology data, demonstrates that this approach provides useful information in data-poor situations. Overall, our study supports the use of toxicogenomics as a relatively fast and cost-effective tool for hazard identification, preliminary evaluation of potential carcinogens, and carcinogenic potency, in addition to identifying current limitations and practical questions for future work. PMID:25605026

  12. Temporal and spatial constraints of action effect on sensory binding.

    PubMed

    Corveleyn, Xavier; Lopez-Moliner, Joan; Coello, Yann

    2015-12-01

    Previous studies have shown that asynchrony in perceived changes in the visual attributes of an object is attenuated when the object is the target of a manual reaching action (e.g. Corveleyn et al. in J Vis, 2012. doi: 10.1167/12.11.20 ). In the present study, we examined the temporal and spatial constraints associated with the effect of action on sensory binding. Participants performed a temporal order judgment task which required them to judge which changed first, the position or the colour of a visual stimulus, either while performing a concurrent motor task (manual acquisition of a visual target) or not (perceptual task). In Experiment 1, the fixed-attribute change (colour or position) occurred 0, 250, 500 or 1000 ms following the end of the motor action or the presentation of an auditory cue, while the variable-attribute change (position or colour) occurred randomly within an interval of ±200 ms from the fixed-attribute change. In Experiment 2, the visual stimulus was presented at a distance of 0, 2, 4 or 8 cm from a central fixation cross which was the target in the motor task. The fixed attribute (colour or position) changed 700 ms after an auditory cue (perceptual task) or when the hand reached the visual target (motor task). The variable-attribute change (position or colour) again occurred within an interval of ±200 ms from the fixed-attribute change. Statistical analysis of the point of subjective simultaneity revealed that performing a motor action reduced the perceived temporal asynchrony in the perceptual task, but only when the visual changes occurred less than 500 ms (for the fixed attribute) following movement execution (Exp. 1) and at a distance of less than 4 cm from the movement endpoint (Exp. 2). These results indicate that action-induced sensory binding requires temporal contiguity and spatial congruency between the endpoint of the action and its visual consequences. PMID:26280314

  13. Finite volume QCD at fixed topological charge

    SciTech Connect

    Aoki, Sinya; Fukaya, Hidenori; Hashimoto, Shoji; Onogi, Tetsuya

    2007-09-01

    In finite volume the partition function of QCD with a given {theta} is a sum of different topological sectors with a weight primarily determined by the topological susceptibility. If a physical observable is evaluated only in a fixed topological sector, the result deviates from the true expectation value by an amount proportional to the inverse space-time volume 1/V. Using the saddle point expansion, we derive formulas to express the correction due to the fixed topological charge in terms of a 1/V expansion. Applying this formula, we propose a class of methods to determine the topological susceptibility in QCD from various correlation functions calculated in a fixed topological sector.

  14. Surveying a Fixed Route1 Reid Sherman

    E-print Network

    Collar, Juan I.

    Surveying a Fixed Route1 Reid Sherman Maps and graphs are great tools for conveying information the information to make sense for someone looking at it that way? Let's say there's a route between two points you will pass. But if you're taking a route that is set out for you, like a road race or a hiking path

  15. COLLIGATIVE PROPERTIES OF SOLUTIONS: I. FIXED CONCENTRATIONS

    E-print Network

    COLLIGATIVE PROPERTIES OF SOLUTIONS: I. FIXED CONCENTRATIONS KENNETH S. ALEXANDER,1 MAREK BISKUP 2) Migration of nearly all the salt into whatever portion of ice/water mixture remains liquid. (2) Clear: (3) Salted water freezes at temperatures lower than the freezing point of pure water

  16. Execution Strategies in Fixed Income Markets

    E-print Network

    Almgren, Robert F.

    Execution Strategies in Fixed Income Markets Robert Almgren April 2, 2013 Reducing trading costs the most important aspect of investing, poor execution of trade decisions can subtract many basis points from overall return. Con- versely, having an effective strategy to execute trades and to mea- sure

  17. Future Fixed Target Facilities

    SciTech Connect

    Melnitchouk, Wolodymyr

    2009-01-01

    We review plans for future fixed target lepton- and hadron-scattering facilities, including the 12 GeV upgraded CEBAF accelerator at Jefferson Lab, neutrino beam facilities at Fermilab, and the antiproton PANDA facility at FAIR. We also briefly review recent theoretical developments which will aid in the interpretation of the data expected from these facilities.

  18. Fixing health care before it fixes us.

    PubMed

    Kotlikoff, Laurence J

    2009-02-01

    The current American health care system is beyond repair. The problems of the health care system are delineated in this discussion. The current health care system needs to be replaced in its entirety with a new system that provides every American with first-rate, first-tier medicine and that doesn't drive our nation broke. The author describes a 10-point Medical Security System, which he proposes will address the problems of the current health care system. PMID:19038633

  19. Managing multiple non-point pressures on water quality and ecological habitat: Spatially targeting effective mitigation actions at the landscape scale.

    NASA Astrophysics Data System (ADS)

    Reaney, S. M.

    2014-12-01

    Catchment systems deliver many benefits to society and ecology but also produce a range of undesirable externalities including flooding, diffuse pollution from agriculture, forestry and urban areas and the export of FIOs. These diffuse pressures are coupled with increasing stream temperature pressures on river from projected climate change. These pressures can be reduced through actions at the landscape scale but are often tackled individually. Any intervention may have benefits for other pressures and hence the challenge is to consider all of the different pressures simultaneously to find solutions with high levels of cross-pressure benefits. The general approach taken within this research has been to use simple but spatially distributed models to predict the pattern of each of the pressures at the landscape scale. These models follow a minimum information requirement approach along the lines of the SCIMAP modelling approach (www.scimap.org.uk). This approach aims to capture the key features of the processes in relative rather than an absolute sense and hence is good at determining key locations to act within a landscape for maximum benefit. The core of the approach is to define the critical sources areas for each pressure based on the analysis of the pattern of the pressure in the landscape and the connectivity from the sources areas to the rivers and lakes. To identify the optimal locations with the landscape for mitigation actions, the benefit of a mitigation action at each location in the landscape needs to be considered. However, as one action has been made, it may change the suitability of other locations in the landscape. For example, as tree cover reduces the temperature in one river reach, the impacts of this cooling are transported downstream with the flow. Therefore, actions need to be considered in sets across multiple sites and objectives to identify the optimal actions set. These modelling results are integrated into a decision support tool which allows the user to explore the implications of considering an individual pressure as opposed to the set of pressures. This is achieved by allowing the user to change the importance of different pressures to identify the optimal locations for a custom combination of pressures. For example, reductions in flood risk can be prioritized over reductions in fine sediment.

  20. Procedures for Behavioral Experiments in Head-Fixed Mice

    PubMed Central

    Guo, Zengcai V.; Hires, S. Andrew; Li, Nuo; O'Connor, Daniel H.; Komiyama, Takaki; Ophir, Eran; Huber, Daniel; Bonardi, Claudia; Morandell, Karin; Gutnisky, Diego; Peron, Simon; Xu, Ning-long; Cox, James; Svoboda, Karel

    2014-01-01

    The mouse is an increasingly prominent model for the analysis of mammalian neuronal circuits. Neural circuits ultimately have to be probed during behaviors that engage the circuits. Linking circuit dynamics to behavior requires precise control of sensory stimuli and measurement of body movements. Head-fixation has been used for behavioral research, particularly in non-human primates, to facilitate precise stimulus control, behavioral monitoring and neural recording. However, choice-based, perceptual decision tasks by head-fixed mice have only recently been introduced. Training mice relies on motivating mice using water restriction. Here we describe procedures for head-fixation, water restriction and behavioral training for head-fixed mice, with a focus on active, whisker-based tactile behaviors. In these experiments mice had restricted access to water (typically 1 ml/day). After ten days of water restriction, body weight stabilized at approximately 80% of initial weight. At that point mice were trained to discriminate sensory stimuli using operant conditioning. Head-fixed mice reported stimuli by licking in go/no-go tasks and also using a forced choice paradigm using a dual lickport. In some cases mice learned to discriminate sensory stimuli in a few trials within the first behavioral session. Delay epochs lasting a second or more were used to separate sensation (e.g. tactile exploration) and action (i.e. licking). Mice performed a variety of perceptual decision tasks with high performance for hundreds of trials per behavioral session. Up to four months of continuous water restriction showed no adverse health effects. Behavioral performance correlated with the degree of water restriction, supporting the importance of controlling access to water. These behavioral paradigms can be combined with cellular resolution imaging, random access photostimulation, and whole cell recordings. PMID:24520413

  1. FixBag : A Fixpoint Calculator for Quantified Bag Constraints

    E-print Network

    Chin, Wei Ngan

    FixBag : A Fixpoint Calculator for Quantified Bag Constraints Tuan-Hung Pham1 , Minh-Thai Trinh2 range of programs, we have developed a tool to compute symbolic fixpoints for quantified bag domain invariants and method pre/post conditions via fix- point analysis of recursive bag constraints. To support

  2. Psychometric curves describe action discrimination in humans.

    PubMed

    Orban, Guy; Platonov, Artem

    2015-09-01

    Action observation is a visual function of a great importance from both the ethological and social point of view. Recently, a number of studies provided new insights into its functional organization as a three-level cortical network encompassing in human and non-human primates occipito-temporal, parietal and premotor regions. However, there is still no general framework which would allow to establish a relationship between neuronal activity in these areas and its behavioral correlates. Demonstrating that general psychophysical laws are also applicable to the visual processing of observed actions could provide us with such a framework. We reasoned that changing the amount of dynamic noise in action movies would produce behavioral responses in human subjects qualitatively similar to the classical psychometric curves. To test this hypothesis, we presented human subjects (n=4) with the movies (2 sec) in which they had to discriminate between the two different hand-actions (rolling and rotation) in a two-alternative forced-choice task. The movies were randomly presented in 5 different fronto-parallel positions and at 2 depths. On every frame in each movie, a certain percentage of random dot-pixel pairs separated by a distance randomly chosen from within a fixed interval were scrambled. By manipulating the percentage of scrambled dot pairs, we created 6 noise levels from 60% (i.e. 60% of dots on each frame were scrambled) to 100%. Our data indicate that the amount of noise in action movies attenuated the ability of our subjects to discriminate between the two actions tested, such that the observers' performance could be described by the classical logistic regression. This psychometric curve suggests that action discrimination follows general rules described in classical visual psychophysics. One implication is that by changing the input strength in action movies can be used to manipulate the activity in single cells and neural populations. Meeting abstract presented at VSS 2015. PMID:26326249

  3. Fixed target facility at the SSC

    SciTech Connect

    Loken, S.C.; Morfin, J.G.

    1985-01-01

    The question of whether a facility for fixed target physics should be provided at the SSC must be answered before the final technical design of the SSC can be completed, particularly if the eventual form of extraction would influence the magnet design. To this end, an enthusiastic group of experimentalists, theoreticians and accelerator specialists have studied this point. The accelerator physics issues were addressed by a group led by E. Colton whose report is contained in these proceedings. The physics addressable by fixed target was considered by many of the Physics area working groups and in particular by the Structure Function Group. This report is the summary of the working group which considered various SSC fixed target experiments and determined which types of beams and detectors would be required. 13 references, 5 figures.

  4. "Wuwei" (Non-Action) Philosophy and Actions: Rethinking "Actions" in School Reform

    ERIC Educational Resources Information Center

    Moon, Seungho

    2015-01-01

    This inquiry aims to enrich conversation regarding school reform. The author asks about what other discourses are possible when the action-oriented question of how to "act" is a major approach to "fix" current educational problems. Drawing from Taoist philosophy of "wuwei" (non-action), the author provides a frame to…

  5. Fixed and Sunk Costs Revisited.

    ERIC Educational Resources Information Center

    Wang, X. Henry; Yang, Bill Z.

    2001-01-01

    Attempts to clarify the concepts of, and the link between, fixed costs and sunk costs. Argues that the root of confusion is the inconsistency in defining the term fixed costs. Consistently defines fixed and sunk costs, and describes how instructors must teach under these definitions. (RLH)

  6. Action and entanglement in gravity and field theory.

    PubMed

    Neiman, Yasha

    2013-12-27

    In nongravitational quantum field theory, the entanglement entropy across a surface depends on the short-distance regularization. Quantum gravity should not require such regularization, and it has been conjectured that the entanglement entropy there is always given by the black hole entropy formula evaluated on the entangling surface. We show that these statements have precise classical counterparts at the level of the action. Specifically, we point out that the action can have a nonadditive imaginary part. In gravity, the latter is fixed by the black hole entropy formula, while in nongravitating theories it is arbitrary. From these classical facts, the entanglement entropy conjecture follows by heuristically applying the relation between actions and wave functions. PMID:24483789

  7. Apparatus for fixing latency

    DOEpatents

    Hall, David R. (Provo, UT); Bartholomew, David B. (Springville, UT); Moon, Justin (Bountiful, UT); Koehler, Roger O. (Provo, UT)

    2009-09-08

    An apparatus for fixing computational latency within a deterministic region on a network comprises a network interface modem, a high priority module and at least one deterministic peripheral device. The network interface modem is in communication with the network. The high priority module is in communication with the network interface modem. The at least one deterministic peripheral device is connected to the high priority module. The high priority module comprises a packet assembler/disassembler, and hardware for performing at least one operation. Also disclosed is an apparatus for executing at least one instruction on a downhole device within a deterministic region, the apparatus comprising a control device, a downhole network, and a downhole device. The control device is near the surface of a downhole tool string. The downhole network is integrated into the tool string. The downhole device is in communication with the downhole network.

  8. Fixed Access Network Sharing

    NASA Astrophysics Data System (ADS)

    Cornaglia, Bruno; Young, Gavin; Marchetta, Antonio

    2015-12-01

    Fixed broadband network deployments are moving inexorably to the use of Next Generation Access (NGA) technologies and architectures. These NGA deployments involve building fiber infrastructure increasingly closer to the customer in order to increase the proportion of fiber on the customer's access connection (Fibre-To-The-Home/Building/Door/Cabinet… i.e. FTTx). This increases the speed of services that can be sold and will be increasingly required to meet the demands of new generations of video services as we evolve from HDTV to "Ultra-HD TV" with 4k and 8k lines of video resolution. However, building fiber access networks is a costly endeavor. It requires significant capital in order to cover any significant geographic coverage. Hence many companies are forming partnerships and joint-ventures in order to share the NGA network construction costs. One form of such a partnership involves two companies agreeing to each build to cover a certain geographic area and then "cross-selling" NGA products to each other in order to access customers within their partner's footprint (NGA coverage area). This is tantamount to a bi-lateral wholesale partnership. The concept of Fixed Access Network Sharing (FANS) is to address the possibility of sharing infrastructure with a high degree of flexibility for all network operators involved. By providing greater configuration control over the NGA network infrastructure, the service provider has a greater ability to define the network and hence to define their product capabilities at the active layer. This gives the service provider partners greater product development autonomy plus the ability to differentiate from each other at the active network layer.

  9. A Root Cause Study on AOA-PWR and CDA-VVER - A Point of View of 'Long-Cell Action' Corrosion Mechanism

    SciTech Connect

    Genn Saji

    2006-07-01

    The author has investigated the characteristics of boron co-deposition with crud experienced in AOA and iron ferrite deposition in CDA. Corrosion product deposits found in cores with appreciable AOA have been reported in mostly nickel-based (as NiO or elemental nickel) as opposed to nickel ferrite deposits common to non-boiling cores. Significant quantities of meta-ZrO{sub 2} and nickel iron oxy-borates (bonaccordite), notably Ni{sub 2}FeBO{sub 5} have also been found in deposits on cores with AOA. On the basis of this general characterization information, the author has constructed a potential-pH diagram of Ni{sub 2}FeB(OH){sub 10}, which is a hydrated state of FeNi{sub 2}(BO{sub 3})O{sub 2} as summarized in this paper. Although preliminary, the estimated E-pH diagram suggests some interesting observation, including: growth of bonaccordite 'needles' on the clad is associated with a local anodic electrochemical reaction necessary to remove excess electrons from the system to a cathode. During the AOA cycle, the concentration of nickel and iron ions must have been unusually high as they should be for a significant amount of crud deposits. The author thinks such an acceleration of the anodic dissolution of metal cations is due to the effect of the long cell action corrosion mechanism. As early as 1949, an Italian scientist Petracchi demonstrated that electrochemical effects significantly influence the erosion rate. He constructed a flow nozzle with specimens kept under external electrical potential. Upon inducing as low as 0.1 mA/cm{sup 2} of the positive current, the erosion rates were reported drastically increased. No erosion was observed by reversing the polarity of the potential. As discussed in a companion paper also presented at this conference, the author discusses various mechanisms (electrochemical cell configurations) that induce potential differences, including those differences in ionic concentration, aeration, temperature, flow velocity, radiation and corrosion potentials. In this paper, the author discusses how these potential differences are related to the AOA/CDA issues in PWR/VVER plants. The author is calling for further verification experiments regarding this corrosion mechanism as a joint international project. (author)

  10. Action of repeat-induced point mutation on both strands of a duplex and on tandem duplications of various sizes in Neurospora.

    PubMed Central

    Watters, M K; Randall, T A; Margolin, B S; Selker, E U; Stadler, D R

    1999-01-01

    In Neurospora crassa, DNA sequence duplications are detected and altered efficiently during the sexual cycle by a process known as RIP (repeat-induced point mutation). Affected sequences are subjected to multiple GC-to-AT mutations. To explore the pattern in which base changes are laid down by RIP we examined two sets of strains. First, we examined the products of a presumptive spontaneous RIP event at the mtr locus. Results of sequencing suggested that a single RIP event produces two distinct patterns of change, descended from the two strands of an affected DNA duplex. Equivalent results were obtained using an exceptional tetrad from a cross with a known duplication flanking the zeta-eta (zeta-eta) locus. The mtr sequence data were also used to further examine the basis for the differential severity of C-to-T mutations on the coding and noncoding strands in genes. The known bias of RIP toward CpA/TpG sites in conjunction with the sequence bias of Neurospora accounts for the differential effect. Finally, we used a collection of tandem repeats (from 16 to 935 bp in length) within the mtr gene to examine the length requirement for RIP. No evidence of RIP was found with duplications shorter than 400 bp while all longer tandem duplications were frequently affected. A comparison of these results with vegetative reversion data for the same duplications is consistent with the idea that reversion of long tandem duplications and RIP share a common step. PMID:10511550

  11. 47 CFR 22.591 - Channels for point-to-point operation.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 47 Telecommunication 2 2010-10-01 2010-10-01 false Channels for point-to-point operation. 22.591... PUBLIC MOBILE SERVICES Paging and Radiotelephone Service Point-To-Point Operation § 22.591 Channels for point-to-point operation. The following channels are allocated for assignment to fixed transmitters...

  12. Action representation for NL instructions Barbara Di Eugenio*

    E-print Network

    of action descriptions goes, consider: Ex. 1 Using a paint roller or brush, apply paste to the wall representing actions as predicates having a fixed number of ar- guments. Among the many complex inferences

  13. 47 CFR 74.644 - Minimum path lengths for fixed links.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... false Minimum path lengths for fixed links. 74.644 Section 74.644 Telecommunication...74.644 Minimum path lengths for fixed links. (a) The distance between end points of a fixed link must equal or exceed the value set...

  14. 47 CFR 78.108 - Minimum path lengths for fixed links.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... false Minimum path lengths for fixed links. 78.108 Section 78.108 Telecommunication...78.108 Minimum path lengths for fixed links. (a) The distance between end points of a fixed link must equal or exceed the value set...

  15. 47 CFR 74.644 - Minimum path lengths for fixed links.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... false Minimum path lengths for fixed links. 74.644 Section 74.644 Telecommunication...74.644 Minimum path lengths for fixed links. (a) The distance between end points of a fixed link must equal or exceed the value set...

  16. 47 CFR 74.644 - Minimum path lengths for fixed links.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... false Minimum path lengths for fixed links. 74.644 Section 74.644 Telecommunication...74.644 Minimum path lengths for fixed links. (a) The distance between end points of a fixed link must equal or exceed the value set...

  17. 47 CFR 74.644 - Minimum path lengths for fixed links.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... false Minimum path lengths for fixed links. 74.644 Section 74.644 Telecommunication...74.644 Minimum path lengths for fixed links. (a) The distance between end points of a fixed link must equal or exceed the value set...

  18. 47 CFR 78.108 - Minimum path lengths for fixed links.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... false Minimum path lengths for fixed links. 78.108 Section 78.108 Telecommunication...78.108 Minimum path lengths for fixed links. (a) The distance between end points of a fixed link must equal or exceed the value set...

  19. 47 CFR 74.644 - Minimum path lengths for fixed links.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... false Minimum path lengths for fixed links. 74.644 Section 74.644 Telecommunication...74.644 Minimum path lengths for fixed links. (a) The distance between end points of a fixed link must equal or exceed the value set...

  20. 47 CFR 78.108 - Minimum path lengths for fixed links.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... false Minimum path lengths for fixed links. 78.108 Section 78.108 Telecommunication...78.108 Minimum path lengths for fixed links. (a) The distance between end points of a fixed link must equal or exceed the value set...

  1. 47 CFR 78.108 - Minimum path lengths for fixed links.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... false Minimum path lengths for fixed links. 78.108 Section 78.108 Telecommunication...78.108 Minimum path lengths for fixed links. (a) The distance between end points of a fixed link must equal or exceed the value set...

  2. 47 CFR 78.108 - Minimum path lengths for fixed links.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... false Minimum path lengths for fixed links. 78.108 Section 78.108 Telecommunication...78.108 Minimum path lengths for fixed links. (a) The distance between end points of a fixed link must equal or exceed the value set...

  3. The Split Common Fixed Point Problem for Directed Operators

    E-print Network

    Censor, Yair

    problem (SFP) and of the convex feasibility problem (CFP). The class of directed operators is an important the convex feasibility problem (CFP), the two-sets split feasibility problem (SFP) and the multiple sets] and was called the split feasibility problem (SFP). They used their simultaneous multiprojections algorithm (see

  4. Using Automata to Characterise Fixed Point Temporal Logics 

    E-print Network

    Kaivola, Roope

    aconjunctive fragment and the monadic second-order calculus of n successors SnS are all equiexpressive, that Büchi-automata, the fixpoint alternation class Pi_2 and the strongly aconjunctive fragment of Pi_2 are similarly related, and that the weak SnS...

  5. Kurt Symanzik - a stable fixed point beyond triviality

    E-print Network

    F. Kleefeld

    2005-08-04

    In 1970 Kurt Symanzik proposed a "precarious" phi**4-theory with a negative quartic coupling constant as a valid candidate for an asymptotically free theory of strong interactions. Symanzik's deep insight in the non-trivial properties of this theory has been overruled since then by the Hermitian intuition of generations of scientists, who considered or consider this actually non-Hermitian highly important theory to be unstable. This short - certainly controversial - communication tries to shed some light on the historical and formalistic context of Symanzik's theory in order to sharpen our (quantum) intuition about non-perturbative theoretical physics between (non)triviality and asymptotic freedom.

  6. Regression Fixed Point Clusters: Motivation, Consistency and Simulations

    E-print Network

    Hennig, Christian

    from the Old Faithful Geyser in the Yellowstone National Park, collected in August 1985. The duration of an eruption of the geyser is modeled here as dependent on the waiting time since the previous eruption Figure 1.1: Old Faithful Geyser data. between ``waiting'' and ``duration'', corresponding

  7. Dislocation pinningdepinning transition: Fixed-point analysis Daniel G. Tekleab

    E-print Network

    Daw, Murray S.

    observed in L12 intermetallic compounds. In such materials, the strength increases with increasing in the presence of cross-slip pinning. These models generally seek applica- tion to L12 intermetallic compounds

  8. MULTILEVEL ALGORITHMS FOR CONSTRAINED COMPACT FIXED POINT PROBLEMS \\Lambda

    E-print Network

    .1) is the Urysohn equation K(u)(t) = Z \\Omega k(t; s; u(s)) ds: (1.3) Maps that are not easily expressible algorithm for parabolic boundary control problems having bound constraints on the control. We also extend to be applicable to boundary control problems for partial differential equations. The algorithms and assumptions

  9. From Fixed Points to Chaos: Three Models of Delayed Discrimination

    PubMed Central

    Barak, Omri; Sussillo, David; Romo, Ranulfo; Tsodyks, Misha; Abbott, L.F.

    2013-01-01

    Working memory is a crucial component of most cognitive tasks. Its neuronal mechanisms are still unclear despite intensive experimental and theoretical explorations. Most theoretical models of working memory assume both time-invariant neural representations and precise connectivity schemes based on the tuning properties of network neurons. A different, more recent class of models assumes randomly connected neurons that have no tuning to any particular task, and bases task performance purely on adjustment of network readout. Intermediate between these schemes are networks that start out random but are trained by a learning scheme. Experimental studies of a delayed vibrotactile discrimination task indicate that some of the neurons in prefrontal cortex are persistently tuned to the frequency of a remembered stimulus, but the majority exhibit more complex relationships to the stimulus that vary considerably across time. We compare three models, ranging from a highly organized linear attractor model to a randomly connected network with chaotic activity, with data recorded during this task. The random network does a surprisingly good job of both performing the task and matching certain aspects of the data. The intermediate model, in which an initially random network is partially trained to perform the working memory task by tuning its recurrent and readout connections, provides a better description, although none of the models matches all features of the data. Our results suggest that prefrontal networks may begin in a random state relative to the task and initially rely on modified readout for task performance. With further training, however, more tuned neurons with less time-varying responses should emerge as the networks become more structured. PMID:23438479

  10. On the uniqueness of loopy belief propagation fixed points

    E-print Network

    Heskes, Tom

    those for convexity of the Bethe free energy. We compare them with (a strength­ ened version of algorithms as well as for other approximate free energies. 1 Introduction Loopy belief propagation is Pearl belief propagation correspond to extrema of the so­called Bethe free energy (Yedidia, 1 #12; Freeman

  11. From fixed points to chaos: three models of delayed discrimination.

    PubMed

    Barak, Omri; Sussillo, David; Romo, Ranulfo; Tsodyks, Misha; Abbott, L F

    2013-04-01

    Working memory is a crucial component of most cognitive tasks. Its neuronal mechanisms are still unclear despite intensive experimental and theoretical explorations. Most theoretical models of working memory assume both time-invariant neural representations and precise connectivity schemes based on the tuning properties of network neurons. A different, more recent class of models assumes randomly connected neurons that have no tuning to any particular task, and bases task performance purely on adjustment of network readout. Intermediate between these schemes are networks that start out random but are trained by a learning scheme. Experimental studies of a delayed vibrotactile discrimination task indicate that some of the neurons in prefrontal cortex are persistently tuned to the frequency of a remembered stimulus, but the majority exhibit more complex relationships to the stimulus that vary considerably across time. We compare three models, ranging from a highly organized line attractor model to a randomly connected network with chaotic activity, with data recorded during this task. The random network does a surprisingly good job of both performing the task and matching certain aspects of the data. The intermediate model, in which an initially random network is partially trained to perform the working memory task by tuning its recurrent and readout connections, provides a better description, although none of the models matches all features of the data. Our results suggest that prefrontal networks may begin in a random state relative to the task and initially rely on modified readout for task performance. With further training, however, more tuned neurons with less time-varying responses should emerge as the networks become more structured. PMID:23438479

  12. Using a Card Trick to Illustrate Fixed Points and Stability

    ERIC Educational Resources Information Center

    Champanerkar, Jyoti; Jani, Mahendra

    2015-01-01

    Mathematical ideas from number theory, group theory, dynamical systems, and computer science have often been used to explain card tricks. Conversely, playing cards have been often used to illustrate the mathematical concepts of probability distributions and group theory. In this paper, we describe how the 21-card trick may be used to illustrate…

  13. LANDSLIDE DATA FIX BEFORE NON-GEOLOGISTS "FIX" THE LANDSLIDE

    E-print Network

    Nichols, Kyle K.

    LANDSLIDE DATA FIX BEFORE NON- GEOLOGISTS "FIX" THE LANDSLIDE NICHOLS, Kyle K., Department, and WRIGHT, Stephen, Department of Geology, University of Vermont, Burlington, VT 05405 Landslides are an unpredictable but common Earth process. Since landslides do not occur on a knowable schedule, it is difficult

  14. 77 FR 70847 - Entergy Nuclear Indian Point 2, LLC; Entergy Nuclear Operations, Inc., Indian Point Nuclear...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-27

    ... From the Federal Register Online via the Government Publishing Office NUCLEAR REGULATORY COMMISSION Entergy Nuclear Indian Point 2, LLC; Entergy Nuclear Operations, Inc., Indian Point Nuclear Generating Unit No. 2, Request for Action AGENCY: Nuclear Regulatory Commission. ACTION: Request for...

  15. 24 CFR 81.46 - Remedial actions.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...remedial actions, including suspension, probation, reprimand or settlement, against...purchasing mortgages from a lender. Probation means that, for a fixed period of...automatically to more severe sanctions than probation, e.g., suspension, if...

  16. 24 CFR 81.46 - Remedial actions.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...remedial actions, including suspension, probation, reprimand or settlement, against...purchasing mortgages from a lender. Probation means that, for a fixed period of...automatically to more severe sanctions than probation, e.g., suspension, if...

  17. 24 CFR 81.46 - Remedial actions.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...remedial actions, including suspension, probation, reprimand or settlement, against...purchasing mortgages from a lender. Probation means that, for a fixed period of...automatically to more severe sanctions than probation, e.g., suspension, if...

  18. 24 CFR 81.46 - Remedial actions.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...remedial actions, including suspension, probation, reprimand or settlement, against...purchasing mortgages from a lender. Probation means that, for a fixed period of...automatically to more severe sanctions than probation, e.g., suspension, if...

  19. 24 CFR 81.46 - Remedial actions.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...remedial actions, including suspension, probation, reprimand or settlement, against...purchasing mortgages from a lender. Probation means that, for a fixed period of...automatically to more severe sanctions than probation, e.g., suspension, if...

  20. 46 CFR 535.801 - Independent action.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... fixed or maximum period of notice to the conference. A conference agreement shall not require or permit.... Furthermore, no term other than “adopt” (e.g., “follow,” “match”) can be used to describe the action...

  1. 46 CFR 535.801 - Independent action.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... fixed or maximum period of notice to the conference. A conference agreement shall not require or permit.... Furthermore, no term other than “adopt” (e.g., “follow,” “match”) can be used to describe the action...

  2. 46 CFR 535.801 - Independent action.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... fixed or maximum period of notice to the conference. A conference agreement shall not require or permit.... Furthermore, no term other than “adopt” (e.g., “follow,” “match”) can be used to describe the action...

  3. 46 CFR 535.801 - Independent action.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... fixed or maximum period of notice to the conference. A conference agreement shall not require or permit.... Furthermore, no term other than “adopt” (e.g., “follow,” “match”) can be used to describe the action...

  4. 46 CFR 535.801 - Independent action.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... fixed or maximum period of notice to the conference. A conference agreement shall not require or permit.... Furthermore, no term other than “adopt” (e.g., “follow,” “match”) can be used to describe the action...

  5. Total effective dose equivalent associated with fixed uranium surface contamination

    SciTech Connect

    Bogard, J.S.; Hamm, R.N.; Ashley, J.C.; Turner, J.E.; England, C.A.; Swenson, D.E.; Brown, K.S.

    1997-04-01

    This report provides the technical basis for establishing a uranium fixed-contamination action level, a fixed uranium surface contamination level exceeding the total radioactivity values of Appendix D of Title 10, Code of Federal Regulations, part 835 (10CFR835), but below which the monitoring, posting, and control requirements for Radiological Areas are not required for the area of the contamination. An area of fixed uranium contamination between 1,000 dpm/100 cm{sup 2} and that level corresponding to an annual total effective dose equivalent (TEDE) of 100 mrem requires only routine monitoring, posting to alert personnel of the contamination, and administrative control. The more extensive requirements for monitoring, posting, and control designated by 10CFR835 for Radiological Areas do not have to be applied for these intermediate fixed-contamination levels.

  6. Choosing Actions

    PubMed Central

    Rosenbaum, David A.; Chapman, Kate M.; Coelho, Chase J.; Gong, Lanyun; Studenka, Breanna E.

    2013-01-01

    Actions that are chosen have properties that distinguish them from actions that are not. Of the nearly infinite possible actions that can achieve any given task, many of the unchosen actions are irrelevant, incorrect, or inappropriate. Others are relevant, correct, or appropriate but are disfavored for other reasons. Our research focuses on the question of what distinguishes actions that are chosen from actions that are possible but are not. We review studies that use simple preference methods to identify factors that contribute to action choices, especially for object-manipulation tasks. We can determine which factors are especially important through simple behavioral experiments. PMID:23761769

  7. 47 CFR 22.603 - 488-494 MHz fixed service in Hawaii.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false 488-494 MHz fixed service in Hawaii. 22.603 Section 22.603 Telecommunication FEDERAL...Point-To-Point Operation § 22.603 488-494 MHz fixed service in Hawaii. Before filing applications for...

  8. 47 CFR 22.603 - 488-494 MHz fixed service in Hawaii.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false 488-494 MHz fixed service in Hawaii. 22.603 Section 22.603 Telecommunication FEDERAL...Point-To-Point Operation § 22.603 488-494 MHz fixed service in Hawaii. Before filing applications for...

  9. 47 CFR 22.603 - 488-494 MHz fixed service in Hawaii.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false 488-494 MHz fixed service in Hawaii. 22.603 Section 22.603 Telecommunication FEDERAL...Point-To-Point Operation § 22.603 488-494 MHz fixed service in Hawaii. Before filing applications for...

  10. 47 CFR 22.603 - 488-494 MHz fixed service in Hawaii.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false 488-494 MHz fixed service in Hawaii. 22.603 Section 22.603 Telecommunication FEDERAL...Point-To-Point Operation § 22.603 488-494 MHz fixed service in Hawaii. Before filing applications for...

  11. 47 CFR 22.603 - 488-494 MHz fixed service in Hawaii.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false 488-494 MHz fixed service in Hawaii. 22.603 Section 22.603 Telecommunication FEDERAL...Point-To-Point Operation § 22.603 488-494 MHz fixed service in Hawaii. Before filing applications for...

  12. Liminality as Thought and Action

    ERIC Educational Resources Information Center

    Emmanuel, Donna T.

    2011-01-01

    Turner's (1974) conception of liminal space provides an entry point to look beyond the given and to create opportunities to examine, critique, and challenge the assumptions inherent in many music programs. Building upon his theory of liminality as a place that is "ambiguous, neither here or there, betwixt and between all fixed points of…

  13. Gauge fixed gluonic observables and neutral kaon mixing on the lattice 

    E-print Network

    Hudspith, Renwick

    2013-11-28

    This thesis presents gauge fixed gluonic observable and neutral Kaon mixing matrix element measurements using nf=2+1 Domain Wall Fermion (DWF) configurations. These were generated with the Iwasaki gauge action by the ...

  14. Why to treat subjects as fixed effects.

    PubMed

    Adelman, James S; Estes, Zachary

    2015-09-01

    Adelman, Marquis, Sabatos-DeVito, and Estes (2013) collected word naming latencies from 4 participants who read 2,820 words 50 times each. Their recommendation and practice was that R² targets set for models should take into account subject idiosyncrasies as replicable patterns, equivalent to a subjects-as-fixed-effects assumption. In light of an interaction involving subjects, they broke down the interaction into individual subject data. Courrieu and Rey's (2015) commentary argues that (a) single-subject data need not be more reliable than subject-average data, and (b) anyway, treating groups of subjects as random samples leads to valid conclusions about general mechanisms of reading. Point (a) was not part of Adelman et al.'s claim. In this reply, we examine the consequences of using the fixed-effect assumption. It (a) produces the correct target to check if by-items regression models contain all necessary variables, (b) more accurately constrains cognitive models, (c) more accurately reveals general mechanisms, and (d) can offer more powerful tests of effects. Even when individual differences are not the primary focus of a study, the fixed-effect analysis is often preferable to the random-effects analysis. PMID:26348203

  15. Differential regulation of fixN-reiterated genes in Rhizobium etli by a novel fixL-fixK cascade.

    PubMed

    Girard, L; Brom, S; Dávalos, A; López, O; Soberón, M; Romero, D

    2000-12-01

    Among the complexities in the regulation of nitrogen fixation in the Rhizobiaceae are reiteration of regulatory components as well as variant roles for each component between species. For Rhizobium etli CFN42, we reported that the symbiotic plasmid (pCFN42d) contains a key regulatory gene (fixKd) and genes for a symbiotic cytochrome oxidase (fixNOQPd). Here we discuss the occurrence of reiteration of these genes (fixKf and fixNOQPf) and the finding of an unusual fixL homolog on a plasmid previously considered cryptic (pCFN42f). The structure of the deduced FixL polypeptide is suggestive of a fusion of the receiver and transmitter modules of a two-component regulatory system as described in R. leguminosarum bv. viciae VF39. Gene fusion analysis, coupled with mutation of each regulatory element, revealed that free-living expression of FixKf was dependent fully on FixL. In contrast, synthesis of FixKd was not detected under the conditions tested. The FixKf protein is needed for microaerobic expression of both fixN reiterations, whereas the FixKd protein appears to be dispensable. Interestingly, expression of the fixN reiterations exhibits a differential dependence for FixL, where transcription of fixNf was suppressed in the absence of FixL but expression of fixNd still showed significant levels. This suggests the existence of a FixL-independent mechanism for expression of the fixNd reiteration. Surprisingly, mutations in fixL, fixKd, or fixKf (either singly or in combination) did not alter symbiotic effectiveness. A mutation in fixNd (but not in fixNf) was, however, severely affected, indicating a differential role for these reiterations in nitrogen fixation. PMID:11106020

  16. Covariant computation of effective actions in Ho?ava-Lifshitz gravity

    NASA Astrophysics Data System (ADS)

    D'Odorico, Giulio; Goossens, Jan-Willem; Saueressig, Frank

    2015-10-01

    We initiate the systematic computation of the heat-kernel coefficients for Laplacian operators obeying anisotropic dispersion relations in curved spacetime. Our results correctly reproduce the limit where isotropy is restored and special anisotropic cases considered previously in the literature. Subsequently, the heat kernel is used to derive the scalar-induced one-loop effective action and beta functions of Ho?ava-Lifshitz gravity. We identify the Gaussian fixed point which is supposed to provide the UV completion of the theory. In the present setting, this fixed point acts as an infrared attractor for the renormalization group flow of Newton's constant and the high-energy phase of the theory is screened by a Landau pole. We comment on the consequences of these findings for the renormalizability of the theory.

  17. Mystery of point charges

    E-print Network

    Andrei Gabrielov; Dmitry Novikov; Boris Shapiro

    2004-09-03

    We discuss the problem of finding an upper bound for the number of equilibrium points of a potential of several fixed point charges in R^n. This question goes back to J.C.Maxwell and M.Morse. Using fewnomial theory we show that for a given number of charges there exists an upper bound independent on the dimension, and show it to be 12 for three charges. We conjecture the exact upper bound for a given configuration of nonnegative charges in terms of its Voronoi diagram, and prove it asymptotically.

  18. Complementary actions

    PubMed Central

    Sartori, Luisa; Betti, Sonia

    2015-01-01

    Complementary colors are color pairs which, when combined in the right proportions, produce white or black. Complementary actions refer here to forms of social interaction wherein individuals adapt their joint actions according to a common aim. Notably, complementary actions are incongruent actions. But being incongruent is not sufficient to be complementary (i.e., to complete the action of another person). Successful complementary interactions are founded on the abilities: (i) to simulate another person’s movements, (ii) to predict another person’s future action/s, (iii) to produce an appropriate incongruent response which differ, while interacting, with observed ones, and (iv) to complete the social interaction by integrating the predicted effects of one’s own action with those of another person. This definition clearly alludes to the functional importance of complementary actions in the perception–action cycle and prompts us to scrutinize what is taking place behind the scenes. Preliminary data on this topic have been provided by recent cutting-edge studies utilizing different research methods. This mini-review aims to provide an up-to-date overview of the processes and the specific activations underlying complementary actions. PMID:25983717

  19. Evidence of the big fix

    NASA Astrophysics Data System (ADS)

    Hamada, Yuta; Kawai, Hikaru; Kawana, Kiyoharu

    2014-06-01

    We give an evidence of the Big Fix. The theory of wormholes and multiverse suggests that the parameters of the Standard Model are fixed in such a way that the total entropy at the late stage of the universe is maximized, which we call the maximum entropy principle. In this paper, we discuss how it can be confirmed by the experimental data, and we show that it is indeed true for the Higgs vacuum expectation value vh. We assume that the baryon number is produced by the sphaleron process, and that the current quark masses, the gauge couplings and the Higgs self-coupling are fixed when we vary vh. It turns out that the existence of the atomic nuclei plays a crucial role to maximize the entropy. This is reminiscent of the anthropic principle, however it is required by the fundamental law in our case.

  20. Fixed Phase Quantum Search Algorithm

    E-print Network

    Ahmed Younes

    2007-10-15

    Building quantum devices using fixed operators is a must to simplify the hardware construction. Quantum search engine is not an exception. In this paper, a fixed phase quantum search algorithm that searches for M matches in an unstructured search space of size N will be presented. Selecting phase shifts of 1.91684\\pi in the standard amplitude amplification will make the technique perform better so as to get probability of success at least 99.58% in O(sqrt(N/M)) better than any know fixed operator quantum search algorithms. The algorithm will be able to handle either a single match or multiple matches in the search space. The algorithm will find a match in O(sqrt(N/M)) whether the number of matches is known or not in advance.

  1. Can We Fix The Web?

    PubMed

    Kolar, Irena; Whitney, Gill

    2015-01-01

    This paper reports on an innovative approach to facilitating the expedient reporting of web accessibility issues using volunteers. The aim of the Fix the Web website and project is not to replace existing formal methods of reporting inaccessible websites, but to provide an easy, informal way by which users with disabilities can report inaccessible websites quickly and can be assured that a volunteer on their behalf will take the issue up with the website owner or administrator. Fix the Web was launched in 2010 and from a small start has gone onto success in dealing with nearly 150 inaccessible websites. The results of an analysis of reports of inaccessible websites received by the Fix the Web are also presented and the practical benefits and limitations of using an informal approach to achieve accessibility are discussed. PMID:26294463

  2. Mobile versus fixed site lithotripsy.

    PubMed Central

    Lewis, C.; Burgess, N. A.; Feneley, R. C.; Matthews, P. N.

    1991-01-01

    The efficacy of a mobile Dornier HM4 lithotriptor, was compared with that of a fixed site Siemens Lithostar. A total of 115 calculi in 98 patients were treated, 55 on the mobile Dornier and 60 on the Lithostar. The groups were similar except for stone size, the mean of the Lithostar group being 11 mm compared with 7.7 mm in the Dornier group. Fragmentation rates were not significantly different, 88% and 75% on the mobile and fixed site machines, respectively and, at 3 months follow-up 66% and 46% were stone free or with fragments of less than 2 mm. There were no serious complications, and the incidence of mild complications was similar in the two groups. We conclude that the mobile Dornier HM4 is an effective lithotriptor and can offer several advantages over fixed site machines. PMID:1929134

  3. Fixed Topology Skeletons Polina Golland and W. Eric. L. Grimson

    E-print Network

    Golland, Polina

    Fixed Topology Skeletons Polina Golland and W. Eric. L. Grimson Artificial Intelligence Laboratory, we present a novel approach to robust skeleton extraction. We use undirected graphs to model connectivity of the skeleton points. The graph topology remains unchanged throughout the skeleton computation

  4. Nonquadratic gauge fixing and ghosts for gauge theories on the hypersphere

    SciTech Connect

    Brandt, F. T.; McKeon, D. G. C.

    2011-10-15

    It has been suggested that using a gauge fixing Lagrangian that is not quadratic in a gauge fixing condition is most appropriate for gauge theories formulated on a hypersphere. We reexamine the appropriate ghost action that is to be associated with gauge fixing, applying a technique that has been used for ensuring that the propagator for a massless spin-two field is transverse and traceless. It is shown that this nonquadratic gauge fixing Lagrangian leads to two pair of complex Fermionic ghosts and two Bosonic real ghosts.

  5. Non-Quadratic Gauge Fixing and Ghosts for Gauge Theories on the Hypersphere

    E-print Network

    F. T. Brandt; D. G. C. McKeon

    2011-10-07

    It has been suggested that using a gauge fixing Lagrangian that is not quadratic in a gauge fixing condition is most appropriate for gauge theories formulated on a hypersphere. We reexamine the appropriate ghost action that is to be associated with gauge fixing, applying a technique that has been used for ensuring that the propagator for a massless spin-two field is transverse and traceless. It is shown that this non-quadratic gauge fixing Lagrangian leads to two pair of complex Fermionic ghosts and two Bosonic real ghosts.

  6. One-dimensional itinerant ferromagnets with Heisenberg symmetry and the ferromagnetic quantum critical point

    NASA Astrophysics Data System (ADS)

    Sengupta, K.; Kim, Yong Baek

    2005-05-01

    We study one-dimensional itinerant ferromagnets with Heisenberg symmetry near a ferromagnetic quantum critical point. It is shown that the Berry phase term arises in the effective action of itinerant ferromagnets when the full SU(2) symmetry is present. We explicitly demonstrate that dynamical critical exponent of the theory with the Berry term is z=2+O(?2) in the sense of ? expansion, as previously discovered in the Ising limit. It appears, however, that the universality class at the interacting fixed point is not the same. We point out that even though the critical theory in the Ising limit can be obtained by the standard Hertz-Millis approach, the Heisenberg limit is expected to be different. We also calculate the exact electron Green functions G(x,t=0) and G(x=0,t) near the transition in a range of temperature, which can be used for experimental signatures of the associated critical points.

  7. Averaging Schemes for Solving Fived Point and Variational Inequality Problems

    E-print Network

    Magnanti, Thomas L.

    We develop and study averaging schemes for solving fixed point and variational inequality problems. Typically, researchers have established convergence results for solution methods for these problems by establishing ...

  8. Perturbation analysis of spontaneous action potential initiation by stochastic ion channels.

    PubMed

    Keener, James P; Newby, Jay M

    2011-07-01

    A stochastic interpretation of spontaneous action potential initiation is developed for the Morris-Lecar equations. Initiation of a spontaneous action potential can be interpreted as the escape from one of the wells of a double well potential, and we develop an asymptotic approximation of the mean exit time using a recently developed quasistationary perturbation method. Using the fact that the activating ionic channel's random openings and closings are fast relative to other processes, we derive an accurate estimate for the mean time to fire an action potential (MFT), which is valid for a below-threshold applied current. Previous studies have found that for above-threshold applied current, where there is only a single stable fixed point, a diffusion approximation can be used. We also explore why different diffusion approximation techniques fail to estimate the MFT. PMID:21867224

  9. Installation for Fixing Elevator Deflection 

    E-print Network

    Unknown

    2011-08-17

    of Species that, ?I believe in no fixed law of development?? (Kuper, p. 283). Darwinian sentiments such as this are fused within the American tradition?s view of evolution and ultimately of progress. For example, Mead states that life forms arise within...

  10. Curricular Guidelines in Fixed Prosthodontics.

    ERIC Educational Resources Information Center

    Brindsen, Gilbert; And Others

    1984-01-01

    The American Association of Dental Schools' guidelines for curriculum development in fixed prosthodontics outline the scope of the subject, interrelationship with other subjects and specialties, primary educational goals, prerequisites, core content, specific behavioral objectives for each subarea, sequencing, and faculty requirements. (MSE)

  11. Fixed drug eruption to tartrazine.

    PubMed

    Orchard, D C; Varigos, G A

    1997-11-01

    An 11-year-old girl with a recurrent fixed drug eruption to tartrazine on the dorsum of the left hand is presented. Oral provocation tests to both the suspected food, an artificially coloured cheese crisp, and to tartrazine were positive. This case highlights fire need to consider artificial flavours, colours and preservatives as potential culprits in classic drug eruptions. PMID:9431719

  12. Fixed Costs and Hours Constraints

    ERIC Educational Resources Information Center

    Johnson, William R.

    2011-01-01

    Hours constraints are typically identified by worker responses to questions asking whether they would prefer a job with more hours and more pay or fewer hours and less pay. Because jobs with different hours but the same rate of pay may be infeasible when there are fixed costs of employment or mandatory overtime premia, the constraint in those…

  13. Action Learning.

    ERIC Educational Resources Information Center

    1996

    These four papers were presented at a symposium on action learning moderated by Lex Dilworth at the 1996 conference of the Academy of Human Resource Development. "Developing an Infrastructure for Individual and Organizational Change: Transfer of Learning from an Action Reflection Learning (ARL) Program" (ARL Inquiry) reports findings from a study…

  14. The fixed-interval scallop in human affairs

    PubMed Central

    Poppen, Roger

    1982-01-01

    Fixed-interval scalloping” is used to describe certain everyday patterns of behavior in textbooks and other educational communications. This is a misleading use of the term. It implies that the behavior is accounted for by the schedule, when, in fact, many other variables are operating. This paper reviews eleven such variables and the research evidence on them. These variables provide a more adequate account of complex behavior and point up areas of limited knowledge requiring further research in both laboratory and applied settings. Extrapolating from basic research on human fixed-performance suggests that there are phenomena of mutual interest to both basic and applied behavior analysts. PMID:22478564

  15. 77 FR 70847 - Entergy Nuclear Indian Point 2, LLC; Entergy Nuclear Operations, Inc., Indian Point Nuclear...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-11-27

    ...action with regard to Indian Point Nuclear Generating Unit No...action with regard to Indian Point Nuclear Generating Unit No...order the licensee of Indian Point Nuclear Generating Unit No...hydrogen following a severe reactor accident and a resulting...

  16. Variable delivery, fixed displacement pump

    DOEpatents

    Sommars, Mark F. (Sparland, IL)

    2001-01-01

    A variable delivery, fixed displacement pump comprises a plurality of pistons reciprocated within corresponding cylinders in a cylinder block. The pistons are reciprocated by rotation of a fixed angle swash plate connected to the pistons. The pistons and cylinders cooperate to define a plurality of fluid compression chambers each have a delivery outlet. A vent port is provided from each fluid compression chamber to vent fluid therefrom during at least a portion of the reciprocal stroke of the piston. Each piston and cylinder combination cooperates to close the associated vent port during another portion of the reciprocal stroke so that fluid is then pumped through the associated delivery outlet. The delivery rate of the pump is varied by adjusting the axial position of the swash plate relative to the cylinder block, which varies the duration of the piston stroke during which the vent port is closed.

  17. Fixed target flammable gas upgrades

    SciTech Connect

    Schmitt, R.; Squires, B.; Gasteyer, T.; Richardson, R.

    1996-12-01

    In the past, fixed target flammable gas systems were not supported in an organized fashion. The Research Division, Mechanical Support Department began to support these gas systems for the 1995 run. This technical memo describes the new approach being used to supply chamber gasses to fixed target experiments at Fermilab. It describes the engineering design features, system safety, system documentation and performance results. Gas mixtures provide the medium for electron detection in proportional and drift chambers. Usually a mixture of a noble gas and a polyatomic quenching gas is used. Sometimes a small amount of electronegative gas is added as well. The mixture required is a function of the specific chamber design, including working voltage, gain requirements, high rate capability, aging and others. For the 1995 fixed target run all the experiments requested once through gas systems. We obtained a summary of problems from the 1990 fixed target run and made a summary of the operations logbook entries from the 1991 run. These summaries primarily include problems involving flammable gas alarms, but also include incidents where Operations was involved or informed. Usually contamination issues were dealt with by the experimenters. The summaries are attached. We discussed past operational issues with the experimenters involved. There were numerous incidents of drift chamber failure where contaminated gas was suspect. However analyses of the gas at the time usually did not show any particular problems. This could have been because the analysis did not look for the troublesome component, the contaminant was concentrated in the gas over the liquid and vented before the sample was taken, or that contaminants were drawn into the chambers directly through leaks or sub-atmospheric pressures. After some study we were unable to determine specific causes of past contamination problems, although in argon-ethane systems the problems were due to the ethane only.

  18. The Point of No Return

    PubMed Central

    Logan, Gordon D.

    2015-01-01

    Bartlett (1958) described the point of no return as a point of irrevocable commitment to action, which was preceded by a period of gradually increasing commitment. As such, the point of no return reflects a fundamental limit on the ability to control thought and action. I review the literature on the point of no return, taking three perspectives. First, I consider the point of no return from the perspective of the controlled act, as a locus in the architecture and anatomy of the underlying processes. I review experiments from the stop-signal paradigm that suggest that the point of no return is located late in the response system. Then I consider the point of no return from the perspective of the act of control that tries to change the controlled act before it becomes irrevocable. From this perspective, the point of no return is a point in time that provides enough “lead time” for the act of control to take effect. I review experiments that measure the response time to the stop signal as the lead time required for response inhibition in the stop-signal paradigm. Finally, I consider the point of no return in hierarchically controlled tasks, in which there may be many points of no return at different levels of the hierarchy. I review experiments on skilled typing that suggest different points of no return for the commands that determine what is typed and the countermands that inhibit typing, with increasing commitment to action the lower the level in the hierarchy. I end by considering the point of no return in perception and thought as well as action. PMID:25633089

  19. SCHOLARSHIP IN ACTION SCHOLARSHIP IN ACTION SCHOLARSHIP IN ACTION SCHOLARSHIP IN ACTION SCHOLARSHIP IN ACTION SCHOLARSHIP IN ACTION

    E-print Network

    McConnell, Terry

    SCHOLARSHIP IN ACTION SCHOLARSHIP IN ACTION SCHOLARSHIP IN ACTION SCHOLARSHIP IN ACTION SCHOLARSHIP IN ACTION SCHOLARSHIP IN ACTION #12;Every day, Syracuse University is propelled by the bold idea of Scholarship in Action. Education that is not static or for its own sake, but the living expression of insights

  20. 47 CFR 80.477 - AMTS points of communication.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... AMTS points of communication. 80.477 Section...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED... AMTS points of communication. (a) AMTS...for fixed service communications to support offshore...any vessel within communication service range...

  1. Analysis of fixed target collisions with the STAR detector

    NASA Astrophysics Data System (ADS)

    Haag, Brooke

    2013-04-01

    Collisions between beam halo nuclei and the aluminum beam pipe allow the STAR detector at RHIC to study fixed-target Au+Al collisions. The injection and sub-injection energy gold beams produce Au+Al collisions at center-of-mass energies of 4.5, 3.5, and 3.0 GeV. These collisions allow STAR to extend the beam energy scan to lower center of mass energies and higher baryon chemical potentials than previously possible. This in turn provides a means of searching for the possible critical point to quantify the nature of the phase transition between hadronic and partonic matter. In this talk, fixed target acceptances for tracking will be discussed. Pion ratios extracted from these fixed-target collisions will be presented and compared to earlier published results from the AGS, SPS, and RHIC.

  2. Final consolidated action plan to Tiger Team

    SciTech Connect

    Not Available

    1992-10-01

    This document contains the planned actions to correct the deficiences identified in the Tiger Team Assessments of Sandia California (August 1990) and Sandia New Mexico (May 1991). Information is also included on the management structures, estimated costs, root causes, prioritization and schedules for the Action Plan. This Plan is an integration of the two individual Action Plans to provide a cost effective, integrated program for implementation by Sandia and monitoring by DOE. This volume (I) contains the findings and actions concerning the environment. Tables 4.2 and 4.7 summarize the annual costs estimated for completing the actions. The total costs for completion of all the actions are estimated to be $283 million over a 12 year period; the majority of the actions to be completed and costs incurred in the first five years. Resources are provided from DOE-ER/WM, the DOE/DP landlord funds (one time, physical fixes), and from the Sandia Indirect Budget.

  3. SFT Action for Separated D-branes

    E-print Network

    Matheson Longton

    2012-03-20

    We present an action for Cubic String Field Theory with one embedding coordinate treated separately. We truncate the action at level (3,9), but unlike many other works we do not impose twist symmetry. We also allow arbitrary zero-modes for the direction considered special. Our action provides a starting point for the study of numerous configurations of D-branes.

  4. SFT Action for Separated D-branes

    E-print Network

    Longton, Matheson

    2012-01-01

    We present an action for Cubic String Field Theory with one embedding coordinate treated separately. We truncate the action at level (3,9), but unlike many other works we do not impose twist symmetry. We also allow arbitrary zero-modes for the direction considered special. Our action provides a starting point for the study of numerous configurations of D-branes.

  5. 75 FR 55970 - Safety Zone; VERMILION 380A at Block 380 Outer Continental Shelf Fixed Platform in the Gulf of...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-15

    ...Department of Transportation, West Building...impracticable. The platform is on fire and immediate...zone around a fixed platform that is in an area...or more in any one year. Though this...concluded this action is one of a category of...VERMILION 380A Fixed Platform Safety...

  6. Global Positioning System Antenna Fixed Height Tripod Adapter

    NASA Technical Reports Server (NTRS)

    Dinardo, Steven J.; Smith, Mark A.

    1997-01-01

    An improved Global Positioning em antenna adaptor allows fixed antenna height measurements by removably attaching an adaptor plate to a conventional surveyor's tripod. Antenna height is controlled by an antenna boom which is a fixed length rod. The antenna is attached to one end of the boom. The opposite end of the boom tapers to a point sized to fit into a depression at the center of survey markers. The boom passes through the hollow center of a universal ball joint which is mounted at the center of the adaptor plate so that the point of the rod can be fixed in the marker's central depression. The mountains of the ball joint allow the joint to be moved horizontally in any direction relative to the tripod. When the ball joint is moved horizontally, the angle between the boom and the vertical changes because the boom's position is fixed at its lower end. A spirit level attached to the rod allows an operator to determine when the boom is plumb. The position of the ball joint is adjusted horizontally until the boom is plumb. At that time the antenna is positioned exactly over the center of the monument and the elevation of the antenna is precisely set by the length of the boom.

  7. Fixed Income Division Nomura International plc

    E-print Network

    Macrina, Andrea

    Fixed Income Division © Nomura International plc Symmetry methods for quadratic Gaussian models International plc Outline Motivation The quadratic Gaussian distribution The quadratic Gaussian process The quadratic Gaussian model #12;Fixed Income Division 3© Nomura International plc Part 1 Motivation #12;Fixed

  8. Theta vacuum physics from QCD at fixed topology

    E-print Network

    Sinya Aoki; Hidenori Fukaya; Shoji Hashimoto; Tetsuya Onogi

    2007-10-24

    We propose a method to obtain physical quantities in the theta vacuum from those at fixed topology, which are different by finite size effects. Extending the work by Brower et al., we derive the formula to estimate these finite size corrections for arbitrary correlators in terms of the topological susceptibility and the theta dependence. Applying this formula, we show that topological susceptibility can be measured through two-point functions of pseudoscalar operator.

  9. [Developments in fixed orthodontic appliances].

    PubMed

    Willems, G; Carels, C E

    2000-04-01

    The Edgewise system and the Begg technique were until the early 1970's two of the most familiar and well-known fixed appliance techniques in orthodontics. During the following years they both underwent some slight adaptations that were generally based on more straightforward biomechanics. These changes have led to what in recent years is called the 'Straight Wire technique'. The latter claims to be the treatment option of choice based on preadjusted appliances and preformed arch wires. Besides biomechanics, treatment tools also concentrated on esthetics. It resulted in the development of smaller brackets as well as tooth coloured ones made from polycarbonates or ceramics. Finally lingual orthodontics starts to play a more important role in the orthodontic treatment options for the new millennium. PMID:11382972

  10. Tipping Point

    MedlinePLUS Videos and Cool Tools

    ... Tipping Point by CPSC Blogger September 22 appliance child Childproofing CPSC danger death electrical fall furniture head ... TV falls with about the same force as child falling from the third story of a building. ...

  11. Lagrangian Points

    NASA Astrophysics Data System (ADS)

    Murdin, P.

    2000-11-01

    Five neutral points (points at which an object experiences no net gravitational force), in the combined gravitational field of two massive bodies which are orbiting their center of mass, at which an object of much smaller mass can exist in equilibrium. They are so named because Joseph-Louis Lagrange in 1772 was the first to find them as solutions to a restricted case of the three-body problem. Th...

  12. Citizen's actions

    NASA Technical Reports Server (NTRS)

    1975-01-01

    The role played by individual citizens as consumers of energy was examined, with emphasis on studying ways in which their action could result in energy conservation. It was shown that there are ways that energy can be conserved in this way, with citizens acting either individually or in groups. The potential savings are significant, but the actual savings may be quite small. The citizens need to be motivated to save and to believe in a conservation ethic; developing such an ethic is difficult, and perhaps not responsive to the shotgun approach now being attempted. The true course of action may be to synthesize new societal structures that provide the maximum evolution of culture within the limitation of scarce energy resources.

  13. Actionable Nuggets

    PubMed Central

    McColl, Mary Ann; Aiken, Alice; Smith, Karen; McColl, Alexander; Green, Michael; Godwin, Marshall; Birtwhistle, Richard; Norman, Kathleen; Brankston, Gabrielle; Schaub, Michael

    2015-01-01

    Abstract Objective To present the results of a pilot study of an innovative methodology for translating best evidence about spinal cord injury (SCI) for family practice. Design Review of Canadian and international peer-reviewed literature to develop SCI Actionable Nuggets, and a mixed qualitative-quantitative evaluation to determine Nuggets’ effect on physician knowledge of and attitudes toward patients with SCI, as well as practice accessibility. Setting Ontario, Newfoundland, and Australia. Participants Forty-nine primary care physicians. Methods Twenty Actionable Nuggets (pertaining to key health issues associated with long-term SCI) were developed. Nugget postcards were mailed weekly for 20 weeks to participating physicians. Prior knowledge of SCI was self-rated by participants; they also completed an online posttest to assess the information they gained from the Nugget postcards. Participants’ opinions about practice accessibility and accommodations for patients with SCI, as well as the acceptability and usefulness of Nuggets, were assessed in interviews. Main findings With Actionable Nuggets, participants’ knowledge of the health needs of patients with SCI improved, as knowledge increased from a self-rating of fair (58%) to very good (75%) based on posttest quiz results. The mean overall score for accessibility and accommodations in physicians’ practices was 72%. Participants’ awareness of the need for screening and disease prevention among this population also increased. The usefulness and acceptability of SCI Nugget postcards were rated as excellent. Conclusion Actionable Nuggets are a knowledge translation tool designed to provide family physicians with concise, practical information about the most prevalent and pressing primary care needs of patients with SCI. This evidence-based resource has been shown to be an excellent fit with information consumption processes in primary care. They were updated and adapted for distribution by the Canadian Medical Association to approximately 50 000 primary care physicians in Canada, in both English and French. PMID:26167564

  14. Realization of the Temperature Scale in the Range from 234.3 K (Hg Triple Point) to 1084.62°C (Cu Freezing Point) in Croatia

    NASA Astrophysics Data System (ADS)

    Zvizdic, Davor; Veliki, Tomislav; Grgec Bermanec, Lovorka

    2008-06-01

    This article describes the realization of the International Temperature Scale in the range from 234.3 K (mercury triple point) to 1084.62°C (copper freezing point) at the Laboratory for Process Measurement (LPM), Faculty of Mechanical Engineering and Naval Architecture (FSB), University of Zagreb. The system for the realization of the ITS-90 consists of the sealed fixed-point cells (mercury triple point, water triple point and gallium melting point) and the apparatus designed for the optimal realization of open fixed-point cells which include the gallium melting point, tin freezing point, zinc freezing point, aluminum freezing point, and copper freezing point. The maintenance of the open fixed-point cells is described, including the system for filling the cells with pure argon and for maintaining the pressure during the realization.

  15. Fixed drug eruptions with modafinil.

    PubMed

    Ghoshal, Loknath; Sinha, Mausumi

    2015-01-01

    Modafinil is a psychostimulant drug, which has been approved by the US Food and Drug Administration for the treatment of narcolepsy associated excessive daytime sleepiness, sleep disorder related to shift work, and obstructive sleep apnea syndrome. However, presently it is being used as a lifestyle medicine; in India, it has been misused as an "over the counter" drug. Modafinil is known to have several cutaneous side effects. Fixed drug eruption (FDE) is a distinctive drug induced reaction pattern characterized by recurrence of eruption at the same site of the skin or mucous membrane with repeated systemic administration. Only two case reports exist in the literature describing modafinil induced FDE until date. Here, we report two similar cases. The increasing use of this class of drug amongst the medical personnel might be posing a threat to the proper use and encouraging subsequent abuse. There might be a considerable population using these drugs unaware of the possible adverse effects. Authorities should be more alert regarding the sale and distribution of such medicines. PMID:25878389

  16. Fixed drug eruptions with modafinil

    PubMed Central

    Ghoshal, Loknath; Sinha, Mausumi

    2015-01-01

    Modafinil is a psychostimulant drug, which has been approved by the US Food and Drug Administration for the treatment of narcolepsy associated excessive daytime sleepiness, sleep disorder related to shift work, and obstructive sleep apnea syndrome. However, presently it is being used as a lifestyle medicine; in India, it has been misused as an “over the counter” drug. Modafinil is known to have several cutaneous side effects. Fixed drug eruption (FDE) is a distinctive drug induced reaction pattern characterized by recurrence of eruption at the same site of the skin or mucous membrane with repeated systemic administration. Only two case reports exist in the literature describing modafinil induced FDE until date. Here, we report two similar cases. The increasing use of this class of drug amongst the medical personnel might be posing a threat to the proper use and encouraging subsequent abuse. There might be a considerable population using these drugs unaware of the possible adverse effects. Authorities should be more alert regarding the sale and distribution of such medicines. PMID:25878389

  17. Gauge Fixing and the Gibbs Phenomenon

    E-print Network

    Mandula, J E

    1999-01-01

    We address the question of why global gauge fixing, specifically to the lattice Landau gauge, becomes an extremely lengthy process for large lattices. We construct an artificial "gauge-fixing" problem which has the essential features encountered in actuality. In the limit in which the size of the system to be gauge fixed becomes infinite, the problem becomes equivalent to finding a series expansion in functions which are related to the Jacobi polynomials. The series converges slowly, as expected. It also converges non-uniformly, which is an observed characteristic of gauge fixing. In the limiting example, the non-uniformity arises through the Gibbs phenomenon.

  18. Software Faults Fixing Effort: Analysis and Prediction

    NASA Technical Reports Server (NTRS)

    Hamill, Maggie; Goseva-Popstojanova, Katerina

    2014-01-01

    Software developers spend significant amount of their time fixing faults. However, not many papers have addressed the effort needed to fix software faults. This paper is focused on comprehensive analysis of the fix implementation effort and factors that affect it, as well as on predicting the level of effort based on information recorded in software change requests. The work is based on data related to 1200 failures, extracted from the change tracking system of a large NASA mission. Our results show that (1) 83% of the total fix implementation effort was associated with only 20% of failures. (2) Both safety critical failures and post-release failures required three times more effort to fix compared to non-critical and pre-release counterparts, respectively. (3) Failures with fixes spread across multiple components and/or across multiple types of software artifacts required more effort. The spread across artifacts was more costly than spread across components. (4) Surprisingly, some types of faults associated with later life-cycle did not require significant effort, especially if only one type of artifact was fixed. (5) The level of fix implementation effort was predicted with 73% accuracy. The medium level fix implementation effort was classified more successfully than both low and high levels.

  19. Pointing control for LDR

    NASA Technical Reports Server (NTRS)

    Yam, Y.; Briggs, C.

    1988-01-01

    One important aspect of the LDR control problem is the possible excitations of structural modes due to random disturbances, mirror chopping, and slewing maneuvers. An analysis was performed to yield a first order estimate of the effects of such dynamic excitations. The analysis involved a study of slewing jitters, chopping jitters, disturbance responses, and pointing errors, making use of a simplified planar LDR model which describes the LDR dynamics on a plane perpendicular to the primary reflector. Briefly, the results indicate that the command slewing profile plays an important role in minimizing the resultant jitter, even to a level acceptable without any control action. An optimal profile should therefore be studied.

  20. Evolutionary quantum cosmology in a gauge-fixed picture

    SciTech Connect

    Vakili, Babak

    2011-05-15

    We study the classical and quantum models of a flat Friedmann-Robertson-Walker space-time, coupled to a perfect fluid, in the context of the consensus and a gauge-fixed Lagrangian frameworks. It is shown that, either in the usual or in the gauge-fixed actions, the evolution of the Universe based on the classical cosmology represents a late time power law expansion, coming from a big-bang singularity in which the scale factor goes to zero for the standard matter, and tending towards a big-rip singularity in which the scale factor diverges for the phantom fluid. We then employ the familiar canonical quantization procedure in the given cosmological setting to find the cosmological wave functions in the corresponding minisuperspace. Using a gauge-fixed (reduced) Lagrangian, we show that it may lead to a Schroedinger equation for the quantum-mechanical description of the model under consideration, the eigenfunctions of which can be used to construct the time dependent wave function of the Universe. We use the resulting wave function in order to investigate the possibility of the avoidance of classical singularities due to quantum effects by means of the many-worlds and ontological interpretation of quantum cosmology.

  1. 43 CFR 3000.12 - What is the fee schedule for fixed fees?

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... statute. 43 CFR part 3833. (b) The amount of a fixed fee is not subject to appeal to the Interior Board of... Processing and Filing Fee Table Document/Action FY 2015 Fee Oil & Gas (parts 3100, 3110, 3120, 3130, 3150... Coal and Oil Shale (parts 3500, 3580) Applications other than those listed below 35. Prospecting...

  2. 43 CFR 3000.12 - What is the fee schedule for fixed fees?

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... and the one-time location fee required by statute. 43 CFR part 3833. (b) The amount of a fixed fee is... Processing and Filing Fee Table Document/action FY 2012 Fee Oil & Gas (parts 3100, 3110, 3120, 3130, 3150... 315 Lease or lease interest transfer 65 Leasing of Solid Minerals Other Than Coal and Oil Shale...

  3. 43 CFR 3000.12 - What is the fee schedule for fixed fees?

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... and the one-time location fee required by statute. 43 CFR part 3833. (b) The amount of a fixed fee is... Processing and Filing Fee Table Document/action FY 2013 fee Oil & Gas (parts 3100, 3110, 3120, 3130, 3150... 320 Lease or lease interest transfer 65 Leasing of Solid Minerals Other Than Coal and Oil Shale...

  4. 75 FR 38019 - Safety Zone; Fixed Mooring Balls, South of Barbers Pt. Harbor Channel, Oahu, HI

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-01

    ... From the Federal Register Online via the Government Printing Office DEPARTMENT OF HOMELAND SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; Fixed Mooring Balls, South of Barbers Pt. Harbor Channel, Oahu, HI AGENCY: Coast Guard, DHS. ACTION: Temporary final rule. SUMMARY: Due to...

  5. Fixed combination of amlodipine/atorvastatin: from mechanisms to trials.

    PubMed

    Ivanovic, Branislava; Tadic, Marijana

    2013-11-01

    Cardiovascular diseases are the leading cause of death worldwide. Risk factors are rarely seen individually, and the 2 most common and most frequently associated risk factors are hypertension and dyslipidemia (DL). Studies conducted in different parts of the world uniquely point out insufficient efficacy of hypertension and DL treatment, which is reflected in blood pressure and low-density lipoprotein levels higher than target values. A reason of this therapeutic failure is the reduced adherence, which is mainly caused by multidrug therapy. A possible solution for this problem is the use of fixed combinations. The main advantages of amlodipine/atorvastatin fixed combination are synergistic effect of these 2 components, a single-dose treatment, high safety profile, and good tolerance. PMID:23832643

  6. Fixed-sample optimization using a probability density function

    SciTech Connect

    Barnett, R.N.; Sun, Zhiwei; Lester, W.A. Jr.

    1997-12-31

    We consider the problem of optimizing parameters in a trial function that is to be used in fixed-node diffusion Monte Carlo calculations. We employ a trial function with a Boys-Handy correlation function and a one-particle basis set of high quality. By employing sample points picked from a positive definite distribution, parameters that determine the nodes of the trial function can be varied without introducing singularities into the optimization. For CH as a test system, we find that a trial function of high quality is obtained and that this trial function yields an improved fixed-node energy. This result sheds light on the important question of how to improve the nodal structure and, thereby, the accuracy of diffusion Monte Carlo.

  7. HANDBOOK STAFF AFFIRMATIVE ACTION

    E-print Network

    Plotkin, Joshua B.

    FOR STAFF AFFIRMATIVE ACTION COMPLIANCE OFFICERS #12; Dear Colleagues: Staff Affirmative Action Compliance Officers, you play's equal opportunity and affirmative action policies and procedures. Together, we

  8. 78 FR 9866 - Special Local Regulation; Moss Point Rockin' the Riverfront Festival; Robertson Lake & O'Leary...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-12

    ...Moss Point Rockin' the Riverfront Festival; Robertson Lake & O'Leary Lake; Moss Point, MS AGENCY: Coast Guard, DHS. ACTION...special local regulation for a portion of Robertson Lake & O'Leary Lake, Moss Point, MS. This action...

  9. Fixed-Response Questions with a Difference.

    ERIC Educational Resources Information Center

    Johnstone, Alex H.; Ambusaidi, Abdullah

    2002-01-01

    Offers three types of fixed-response questions that are designed to overcome drawbacks appearing in the conventional forms of fixed-response questions such as not allowing the examiner to investigate reasoning, background, or prevent guessing. (Contains 14 references.) (Author/YDS)

  10. Negotiating a Fixed-Unit Price Contract.

    ERIC Educational Resources Information Center

    Pasquale, Mathew; Morrison, Wade

    1986-01-01

    Discusses the concept of "fixed-unit price contracting," an arrangement that is becoming popular with private industry councils (PICs). Guidelines include (1) find out as much as you can about the PIC's requirements; (2) figure out whether you can meet the PIC's requirements; and (3) keep in mind that most elements of a fixed-unit price contract…

  11. INVESTIGATION Gene Genealogies Within a Fixed Pedigree,

    E-print Network

    INVESTIGATION Gene Genealogies Within a Fixed Pedigree, and the Robustness of Kingman's Coalescent, not as a random quantity. Gene genealogical models should describe the outcome of the percolation of genetic provide a surprisingly accurate description of gene genealogies on a fixed pedigree. We study

  12. Transmit Power Control in Fixed Cellular Broadband Wireless Systems Salem Salamah, David D. Falconer and H. Yanikomeroglu

    E-print Network

    Yanikomeroglu, Halim

    Transmit Power Control in Fixed Cellular Broadband Wireless Systems Salem Salamah, David D range. I. INTRODUCTION Cellular fixed broadband access system has been proposed in the frequency range-wave point-to-multipoint access systems that provide broadband services to both residential and commercial

  13. Preference for Reinforcers under Progressive- and Fixed-Ratio Schedules: A Comparison of Single and Concurrent Arrangements

    ERIC Educational Resources Information Center

    Glover, Ashley C.; Roane, Henry S.; Kadey, Heather J.; Grow, Laura L.

    2008-01-01

    Progressive-ratio (PR) schedules were used to identify the break point (i.e., the last schedule value completed) for 2 reinforcers under single and concurrent schedules. After the respective break points were established, the same reinforcers were presented under concurrent fixed-ratio (FR) schedules that were yoked to the break points obtained…

  14. Reflections on Working with Virtual Action Learning

    ERIC Educational Resources Information Center

    Pedler, Mike; Hauser, Bernhard; Caulat, Ghislaine

    2014-01-01

    This paper brings together the reflections of the authors on their shared and individual experiences of virtual action learning. Whilst many conclusions are shared, there are also some points of difference in practices.

  15. Gauge invariance in 2Pi effective actions

    SciTech Connect

    Mottola, E.

    2003-01-01

    (Abstract damaged) The 2PI (two particle irreducible) effective action is a general field theoretic tool for addressing this problem. In constructing it one introduces sources for both the fields and their two-point bilinears.

  16. 21 CFR 120.10 - Corrective actions.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...actions. 120.10 Section 120.10 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION HAZARD ANALYSIS AND CRITICAL CONTROL POINT (HACCP)...

  17. 21 CFR 120.10 - Corrective actions.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...actions. 120.10 Section 120.10 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION HAZARD ANALYSIS AND CRITICAL CONTROL POINT (HACCP)...

  18. 21 CFR 120.10 - Corrective actions.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...actions. 120.10 Section 120.10 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION HAZARD ANALYSIS AND CRITICAL CONTROL POINT (HACCP)...

  19. 21 CFR 120.10 - Corrective actions.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...actions. 120.10 Section 120.10 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION HAZARD ANALYSIS AND CRITICAL CONTROL POINT (HACCP)...

  20. 21 CFR 120.10 - Corrective actions.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...actions. 120.10 Section 120.10 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN CONSUMPTION HAZARD ANALYSIS AND CRITICAL CONTROL POINT (HACCP)...

  1. Quick-Release Pin With Lever Action

    NASA Technical Reports Server (NTRS)

    Trevino, Robert C.

    1995-01-01

    Lever-action quick-release pin operated more easily. Mechanism operated with gloved hand. In modified version, lever added to handle to facilitate actuation. Lever action reduces actuation force. Lever-action pin operated by squeezing on any point of moveable ends of lever and handle together between thumb and forefinger or by simply grasping and squeezing handle and lever with entire hand in more natural grasp.

  2. 9 CFR 417.3 - Corrective actions.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... ANALYSIS AND CRITICAL CONTROL POINT (HACCP) SYSTEMS § 417.3 Corrective actions. (a) The written HACCP plan.... The HACCP plan shall describe the corrective action to be taken, and assign responsibility for taking... identified deviation or other unforeseen hazard should be incorporated into the HACCP plan. (c)...

  3. 9 CFR 417.3 - Corrective actions.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... ANALYSIS AND CRITICAL CONTROL POINT (HACCP) SYSTEMS § 417.3 Corrective actions. (a) The written HACCP plan.... The HACCP plan shall describe the corrective action to be taken, and assign responsibility for taking... identified deviation or other unforeseen hazard should be incorporated into the HACCP plan. (c)...

  4. The 1994 Fermilab Fixed Target Program

    SciTech Connect

    Conrad, J. |

    1994-11-01

    This paper highlights the results of the Fermilab Fixed Target Program that were announced between October, 1993 and October, 1994. These results are drawn from 18 experiments that took data in the 1985, 1987 and 1990/91 fixed target running periods. For this discussion, the Fermilab Fixed Target Program is divided into 5 major topics: hadron structure, precision electroweak measurements, heavy quark production, polarization and magnetic moments, and searches for new phenomena. However, it should be noted that most experiments span several subtopics. Also, measurements within each subtopic often affect the results in other subtopics. For example, parton distributions from hadron structure measurements are used in the studies of heavy quark production.

  5. 47 CFR 25.276 - Points of communication.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...station. (b) Space stations licensed under this...provide service to earth stations located within the...foreign points over space stations in the Fixed-Satellite...those operated by the International...

  6. 47 CFR 25.276 - Points of communication.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...station. (b) Space stations licensed under this...provide service to earth stations located within the...foreign points over space stations in the Fixed-Satellite...those operated by the International...

  7. 47 CFR 25.276 - Points of communication.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...station. (b) Space stations licensed under this...provide service to earth stations located within the...foreign points over space stations in the Fixed-Satellite...those operated by the International...

  8. Experiences with Light Weight Fixed Wing Aerial Mapping UAVs

    NASA Astrophysics Data System (ADS)

    Mayr, W.

    2014-11-01

    UAVs seem to be the next "cloud" like topic, not only in geomatics. Unmanned Airborne Vehicles are not a wonder-tool, but a complementary approach to resolve some tasks more efficiently than before or at all. Since 2006 we commercially apply fixed wing, light weight UAVs for aerial mapping purposes. In this paper we like to share our experiences with UAVs of less than 5 kg and illuminate some limitations as well as potentials. Whereas multicopters seem to be in use everywhere, fixed wing UAVs more frequently seem to be applied in specific and geospatially oriented applications. Having processed several hundred UAV aerial mapping projects there forms a stable picture of this technology. Our impressions on durability, handling, and reliability of fixed wing UAVs get presented. We report on our day-to-day experiences and point to often simple hurdles to overcome. Various cameras were flown, different approaches of handling their geometries with different software packages were undertaken. Remarks to achieved geometric accuracies as well as the consequences of using dual frequency GPS instead of simple yet great single frequency GPS are discussed. All of this packed into the subsequent paper.

  9. 29 CFR 1910.27 - Fixed ladders.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...Continued) OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR OCCUPATIONAL SAFETY AND HEALTH STANDARDS Walking-Working Surfaces § 1910.27 Fixed ladders. (a) Design requirements —(1) Design considerations. All...

  10. 29 CFR 1910.27 - Fixed ladders.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...Continued) OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR OCCUPATIONAL SAFETY AND HEALTH STANDARDS Walking-Working Surfaces § 1910.27 Fixed ladders. (a) Design requirements —(1) Design considerations. All...

  11. 29 CFR 1910.27 - Fixed ladders.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...Continued) OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR OCCUPATIONAL SAFETY AND HEALTH STANDARDS Walking-Working Surfaces § 1910.27 Fixed ladders. (a) Design requirements —(1) Design considerations. All...

  12. 29 CFR 1910.27 - Fixed ladders.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...Continued) OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR OCCUPATIONAL SAFETY AND HEALTH STANDARDS Walking-Working Surfaces § 1910.27 Fixed ladders. (a) Design requirements —(1) Design considerations. All...

  13. Fixed-target physics at Fermilab

    SciTech Connect

    Bjorken, J.D.

    1985-03-01

    The Fermilab Energy Saver is now successfully commissioned and fixed-target experimentation at high energy (800 GeV) has begun. In addition, a number of new experiments designed to exploit the unique features of the Tevatron are yet to come on-line. In this talk, we will review recent accomplishments in the fixed-target program and describe experiments in progress and others yet to come.

  14. Fixed energy universality for generalized Wigner matrices

    E-print Network

    Paul Bourgade; Laszlo Erdos; Hong-Tzer Yau; Jun Yin

    2015-04-16

    We prove the Wigner-Dyson-Mehta conjecture at fixed energy in the bulk of the spectrum for generalized symmetric and Hermitian Wigner matrices. Previous results concerning the universality of random matrices either require an averaging in the energy parameter or they hold only for Hermitian matrices if the energy parameter is fixed. We develop a homogenization theory of the Dyson Brownian motion and show that microscopic universality follows from mesoscopic statistics.

  15. Diesel Particulate Oxidation Model: Combined Effects of Volatiles and Fixed Carbon Combustion

    SciTech Connect

    Strzelec, Andrea; Toops, Todd J; Daw, C Stuart; Foster, Prof. Dave; Rutland, Prof. Christopher J.

    2010-01-01

    Diesel particulate samples were collected from a light duty engine operated at a single speed-load point with a range of biodiesel and conventional fuel blends. The oxidation reactivity of the samples was characterized in a laboratory reactor, and BET surface area measurements were made at several points during oxidation of the fixed carbon component of both types of particulate. The fixed carbon component of biodiesel particulate has a significantly higher surface area for the initial stages of oxidation, but the surface areas for the two particulates become similar as fixed carbon oxidation proceeds beyond 40%. When fixed carbon oxidation rates are normalized to total surface area, it is possible to describe the oxidation rates of the fixed carbon portion of both types of particulates with a single set of Arrhenius parameters. The measured surface area evolution during particle oxidation was found to be inconsistent with shrinking sphere oxidation. When the oxidation model for the fixed carbon was combined with a first-order model for the release and oxidation of volatiles, it was possible to obtain good agreement with the observed oxidation rates for both types of nascent (non-devolatilized) particulates. Additional studies are underway to confirm that intermediate fuel blends behave consistently with these limiting cases.

  16. Preliminary Measurements of the Xenon Triple Point

    NASA Astrophysics Data System (ADS)

    Steur, P. P. M.; Giraudi, D.

    2014-04-01

    Ever since the construction and definition of the highly successful International Temperature Scale of 1990 (ITS-90), one severe deficiency of the scale has been recognized, without a reliable remedy. The problem is the fact that the only then available high-quality fixed point between the argon triple point and the water triple point was the mercury triple point, which unfortunately is situated rather closely to the water triple point, thus having an extremely strong influence on the interpolation function of SPRTs in the range. Already before 1990, measurements on possible fixed points better placed in this temperature range have been investigated, such as the triple points of krypton and xenon. However, results have been rather elusive, mainly regarding the rather large melting range of their transition. A turning point was the 2005 paper from the National Research Council (NRC, Canada), where it was established that the relatively high content of krypton was the culprit for the large melting range of the xenon transitions published previously. Indeed, measurements on a xenon sample with very low krypton content produced a very high-quality plateau, of the same level as other ITS-90 fixed points. However, no follow-up measurements have been reported, and thus neither have comparison measurements been reported. Shortly, after the appearance of the NRC paper, Istituto Nazionale di Ricerca Metrologica (INRIM, Italy) acquired a batch of the same high-purity xenon as used by NRC with the aim of preparing a few sealed cells with it and trying to reproduce the NRC results. However, with the start of the Neon Project (Euromet Project 770), the realization of these intentions had to be postponed until now. Last December, three cells of different design have been filled with this high-quality xenon and preliminary results of the measurements on the triple point are reported.

  17. Controlling Cyanobacterial Blooms in Hypertrophic Lake Taihu, China: Will Nitrogen Reductions Cause Replacement of Non-N2 Fixing by N2 Fixing Taxa?

    PubMed Central

    Paerl, Hans W.; Xu, Hai; Hall, Nathan S.; Zhu, Guangwei; Qin, Boqiang; Wu, Yali; Rossignol, Karen L.; Dong, Linghan; McCarthy, Mark J.; Joyner, Alan R.

    2014-01-01

    Excessive anthropogenic nitrogen (N) and phosphorus (P) inputs have caused an alarming increase in harmful cyanobacterial blooms, threatening sustainability of lakes and reservoirs worldwide. Hypertrophic Lake Taihu, China’s third largest freshwater lake, typifies this predicament, with toxic blooms of the non-N2 fixing cyanobacteria Microcystis spp. dominating from spring through fall. Previous studies indicate N and P reductions are needed to reduce bloom magnitude and duration. However, N reductions may encourage replacement of non-N2 fixing with N2 fixing cyanobacteria. This potentially counterproductive scenario was evaluated using replicate, large (1000 L), in-lake mesocosms during summer bloom periods. N+P additions led to maximum phytoplankton production. Phosphorus enrichment, which promoted N limitation, resulted in increases in N2 fixing taxa (Anabaena spp.), but it did not lead to significant replacement of non-N2 fixing with N2 fixing cyanobacteria, and N2 fixation rates remained ecologically insignificant. Furthermore, P enrichment failed to increase phytoplankton production relative to controls, indicating that N was the most limiting nutrient throughout this period. We propose that Microcystis spp. and other non-N2 fixing genera can maintain dominance in this shallow, highly turbid, nutrient-enriched lake by outcompeting N2 fixing taxa for existing sources of N and P stored and cycled in the lake. To bring Taihu and other hypertrophic systems below the bloom threshold, both N and P reductions will be needed until the legacy of high N and P loading and sediment nutrient storage in these systems is depleted. At that point, a more exclusive focus on P reductions may be feasible. PMID:25405474

  18. 49 CFR 218.109 - Hand-operated fixed derails.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Transportation 4 2014-10-01 2014-10-01 false Hand-operated fixed derails. 218.109 Section 218.109 ...Handling Equipment, Switches, and Fixed Derails § 218.109 Hand-operated fixed derails. (a)(1) Each...

  19. 49 CFR 218.109 - Hand-operated fixed derails.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Transportation 4 2013-10-01 2013-10-01 false Hand-operated fixed derails. 218.109 Section 218.109 ...Handling Equipment, Switches, and Fixed Derails § 218.109 Hand-operated fixed derails. (a)(1) Each...

  20. 49 CFR 218.109 - Hand-operated fixed derails.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Transportation 4 2011-10-01 2011-10-01 false Hand-operated fixed derails. 218.109 Section 218.109 ...Handling Equipment, Switches, and Fixed Derails § 218.109 Hand-operated fixed derails. (a)(1) Each...

  1. 49 CFR 218.109 - Hand-operated fixed derails.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Transportation 4 2010-10-01 2010-10-01 false Hand-operated fixed derails. 218.109 Section 218.109 ...Handling Equipment, Switches, and Fixed Derails § 218.109 Hand-operated fixed derails. (a)(1) Each...

  2. 49 CFR 218.109 - Hand-operated fixed derails.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Transportation 4 2012-10-01 2012-10-01 false Hand-operated fixed derails. 218.109 Section 218.109 ...Handling Equipment, Switches, and Fixed Derails § 218.109 Hand-operated fixed derails. (a)(1) Each...

  3. 48 CFR 46.302 - Fixed-price supply contracts.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...furnishing of supplies, when a fixed-price contract is contemplated and...Government's interest. If a fixed-price incentive contract is contemplated...its Alternate I. If a fixed-ceiling-price contract with retroactive...

  4. 47 CFR 25.277 - Temporary fixed earth station operations.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Temporary fixed earth station operations. 25.277 Section 25...Technical Operations § 25.277 Temporary fixed earth station operations. (a) When an earth station in the Fixed-Satellite...

  5. 47 CFR 25.277 - Temporary fixed earth station operations.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Temporary fixed earth station operations. 25.277 Section 25...Technical Operations § 25.277 Temporary fixed earth station operations. (a) When an earth station in the Fixed-Satellite...

  6. 47 CFR 25.277 - Temporary fixed earth station operations.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Temporary fixed earth station operations. 25.277 Section 25...Technical Operations § 25.277 Temporary fixed earth station operations. (a) When an earth station in the Fixed-Satellite...

  7. 47 CFR 25.277 - Temporary fixed earth station operations.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Temporary fixed earth station operations. 25.277 Section 25...Technical Operations § 25.277 Temporary fixed earth station operations. (a) When an earth station in the Fixed-Satellite...

  8. 47 CFR 25.277 - Temporary fixed earth station operations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Temporary fixed earth station operations. 25.277 Section 25...Technical Operations § 25.277 Temporary fixed earth station operations. (a) When an earth station in the Fixed-Satellite...

  9. ALL ACTIONS Number Priority Action Type

    E-print Network

    The federal action agencies shall define the comprehensive maintenance costs by fish and wildlife investment, and federal action agencies. The work group shall report to the Council quarterly on its progress toward Report O&M sub- committee Investment strategy 200 High IS - 4 The Council and the federal action agencies

  10. Final consolidated action plan to Tiger Team. Volume 1

    SciTech Connect

    Not Available

    1992-10-01

    This document contains the planned actions to correct the deficiences identified in the Tiger Team Assessments of Sandia California (August 1990) and Sandia New Mexico (May 1991). Information is also included on the management structures, estimated costs, root causes, prioritization and schedules for the Action Plan. This Plan is an integration of the two individual Action Plans to provide a cost effective, integrated program for implementation by Sandia and monitoring by DOE. This volume (I) contains the findings and actions concerning the environment. Tables 4.2 and 4.7 summarize the annual costs estimated for completing the actions. The total costs for completion of all the actions are estimated to be $283 million over a 12 year period; the majority of the actions to be completed and costs incurred in the first five years. Resources are provided from DOE-ER/WM, the DOE/DP landlord funds (one time, physical fixes), and from the Sandia Indirect Budget.

  11. CHANGES OF ACTION POTENTIAL SHAPE AND VELOCITY FOR

    E-print Network

    Levine, Alex J.

    CHANGES OF ACTION POTENTIAL SHAPE AND VELOCITY FOR CHANGING CORE CONDUCTOR GEOMETRY STEVEN S and velocity of an action potential were computed in regions of changing core conductor geometry. Step decrease showed increase of both velocity and peak height as the action potential approaches a point of step

  12. 46 CFR 169.564 - Fixed extinguishing system, general.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...DEPARTMENT OF HOMELAND SECURITY (CONTINUED) NAUTICAL SCHOOLS SAILING SCHOOL VESSELS Lifesaving and Firefighting Equipment Firefighting Equipment § 169.564 Fixed extinguishing system, general. (a) A fixed carbon dioxide,...

  13. 46 CFR 169.564 - Fixed extinguishing system, general.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...DEPARTMENT OF HOMELAND SECURITY (CONTINUED) NAUTICAL SCHOOLS SAILING SCHOOL VESSELS Lifesaving and Firefighting Equipment Firefighting Equipment § 169.564 Fixed extinguishing system, general. (a) A fixed carbon dioxide,...

  14. 46 CFR 169.564 - Fixed extinguishing system, general.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...DEPARTMENT OF HOMELAND SECURITY (CONTINUED) NAUTICAL SCHOOLS SAILING SCHOOL VESSELS Lifesaving and Firefighting Equipment Firefighting Equipment § 169.564 Fixed extinguishing system, general. (a) Fixed carbon dioxide or...

  15. 46 CFR 169.564 - Fixed extinguishing system, general.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...DEPARTMENT OF HOMELAND SECURITY (CONTINUED) NAUTICAL SCHOOLS SAILING SCHOOL VESSELS Lifesaving and Firefighting Equipment Firefighting Equipment § 169.564 Fixed extinguishing system, general. (a) A fixed carbon dioxide,...

  16. 46 CFR 169.564 - Fixed extinguishing system, general.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...DEPARTMENT OF HOMELAND SECURITY (CONTINUED) NAUTICAL SCHOOLS SAILING SCHOOL VESSELS Lifesaving and Firefighting Equipment Firefighting Equipment § 169.564 Fixed extinguishing system, general. (a) Fixed carbon dioxide or...

  17. Vibration suppression of fixed-time jib crane maneuvers

    SciTech Connect

    Parker, G.G.; Petterson, B.; Dohrmann, C.R.; Robinett, R.D.

    1995-02-01

    A jib crane consists of a pendulum-like end line attached to a rotatable jib. Within this general category of cranes there exist devices with multiple degrees of freedom including variable load-line length and variable jib length. These cranes are commonly used for construction and transportation applications. Point-to-point payload maneuvers using jib cranes are performed so as not to excite the spherical pendulum modes of their cable and payload assemblies. Typically, these pendulum modes, although time-varying, exhibit low frequencies. The resulting maneuvers are therefore performed slowly, contributing to high construction and transportation costs. The crane considered here consists of a spherical pendulum attached to a rigid jib. The other end of the jib is attached to a direct drive motor for generating rotational motion. A general approach is presented for determining the open-loop trajectories for the jib rotation for accomplishing fixed-time, point-to-point, residual oscillation free, symmetric maneuvers. These residual oscillation free trajectories purposely excite the pendulum modes in such a way that at the end of the maneuver the oscillatory degrees of freedom are quiescent. Simulation results are presented with experimental verification.

  18. LEADERSHIP, ACTION, SKILLS, PREVENTION, LEADERSHIP,

    E-print Network

    Leistikow, Bruce N.

    Group, Graphic Design Portions of this Guide were adapted from WOSHTEP's Taking Action for SafetyLEADERSHIP, ACTION, SKILLS, PREVENTION, LEADERSHIP, ACTION, SKILLS, PREVENTION, LEADERSHIP, ACTION, SKILLS, PREVENTION, LEADERSHIP, ACTION, SKILLS, PREVENTION, LEADERSHIP, ACTION, SKILLS, PREVENTION

  19. Determinants of Human Fixed-Interval Performance Following Varied Exposure to Reinforcement Schedules

    ERIC Educational Resources Information Center

    Torgrud, Laine J.; Holborn, Stephen W.; Zak, Robert D.

    2006-01-01

    Undergraduates given accurate instructions pressed keys for token points under either a variety of reinforcement schedules (variety training) or under a single schedule. Response rates on a fixed-interval (FI) test schedule then were assessed. Experiment 1 compared variety training inclusive of FI-optimal rates (functional) to training excluding…

  20. Shop-scheduling problems with fixed and non-fixed machine orders of the jobs

    E-print Network

    Magdeburg, Universität

    and * non-fixed machine orders of the jobs Natalia V. Shakhlevich, Yuri N. Sotskov the makespan has to be mini- mized. In such a problem, some jobs have fixed machine orders (as in the job- shop), while the operations of the other jobs may be processed in arbitrary order (as in the open

  1. 78 FR 29063 - Survey of Urban Rates for Fixed Voice and Fixed Broadband Residential Services

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-17

    ...In this document, the Wireline Competition Bureau and the Wireless Telecommunications Bureau adopt the form and content for a survey of urban rates for fixed voice and fixed broadband residential services, which the Commission will use to implement universal service reforms adopted as part of the USF/ICC Transformation...

  2. Deformation of the CP(1) model leading to fixed size solitons in 2+1 dimensions

    E-print Network

    Adam J Peterson

    2013-09-20

    We discuss static particle-like solitons in the 2+1 dimensional CP(1) model with a small mass deformation $m$ preserving a $U(1) \\times Z_2$ symmetry in the Lagrangian. Due to the breaking of scale invariance, the energy function becomes a strictly increasing function of the soliton size $\\rho$, and therefore no classical finite size solution exists in this model. To remedy this we employ a well known technique of introducing a forth-order derivative term in the Lagrangian to force the soliton action to diverge at small values of $\\rho$. With this additional term the action exhibits a stable minimum at fixed size $\\rho$.

  3. Action knowledge, visuomotor activation, and embodiment in the two action systems

    PubMed Central

    Buxbaum, Laurel J.; Kalénine, Solène

    2015-01-01

    Scientific interest in the relationship between cognition and action has increased markedly in the past several years, fueled by the discovery of mirror neurons in monkey prefrontal and parietal cortex and by the emergence of a movement in cognitive psychology, termed the embodied cognition framework, which emphasizes the role of simulation in cognitive representations. Guided by a functional neuroanatomic model called the Two Action Systems account, which posits numerous points of differentiation between structure- and function-based actions, we focus on two of the major issues under recent scrutiny: the relationship between representations for action production and recognition, and the role of action in object representations. We suggest that mirror neurons in humans are not critical for full action understanding, and that only function-based (and not structure-based) action is a component of embodied object concepts. PMID:20392282

  4. Microanalysis of fixed-interval responding

    SciTech Connect

    Gentry, G.D.; Weiss, B.; Laties, V.G.

    1983-03-01

    The fixed-interval schedule of reinforcement is one of the more widely studied schedules in the experimental analysis of behavior and is also a common baseline for behavior pharmacology. Despite many intensive studies, the controlling variables and the pattern of behavior engendered are not well understood. The present study examined the microstructure and superstructure of the behavior engendered by a fixed-interval 5- and a fixed-interval 15-minute schedule of food reinforcement in the pigeon. Analysis of performance typical of fixed-interval responding indicated that the scalloped pattern does not result from smooth acceleration in responding, but, rather, from renewed pausing early in the interval. Individual interresponse-time (IRT) analyses provided no evidence of acceleration. There was a strong indication of alternation is shorter-longer IRTs, but these shorter-longer IRTs did not occur at random, reflecting instead a sequential dependency in successive IRTs. Furthermore, early in the interval there was a high relative frequency of short IRTs. Such a pattern of early pauses and short IRTs does not suggest behavior typical of reinforced responding as exemplified by the pattern found near the end of the interval. Thus, behavior from clearly scalloped performance can be classified into three states: postreinforcement pause, interim behavior, and terminal behavior. 31 references, 11 figures, 4 tables.

  5. Florida Educational Fixed Capital Outlay Budgeting.

    ERIC Educational Resources Information Center

    King, Candice A.; Carpenter, James L.

    In July 1979, the Florida legislature commissioned a comprehensive evaluation of the state's educational fixed capital outlay (EFCO) program, through which the state funded all capital projects at all levels of public education. The study, completed for the 1980 legislative session, comprised 18 topical reports including EFCO funding recipients,…

  6. Fixing the Shadows While Moving the Gnomon

    ERIC Educational Resources Information Center

    Gangui, Alejandro

    2015-01-01

    It is a common practice to fix a vertical gnomon and study the moving shadow cast by it. This shows our local solar time and gives us a hint regarding the season in which we perform the observation. The moving shadow can also tell us our latitude with high precision. In this paper we propose to exchange the roles and while keeping the shadows…

  7. 46 CFR 170.235 - Fixed ballast.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...b) Fixed ballast may not be removed from a vessel or relocated unless approved by the Coast Guard Marine Safety Center or the ABS. However, ballast may be temporarily moved for vessel examination or repair if done under the supervision of the OCMI....

  8. Perchlorate Degradation in Fixed Bed Bioreactors-1

    E-print Network

    Perchlorate Degradation in Fixed Bed Bioreactors- 1 Bruce Logan (blogan@psu.edu) Department important and emerging topics: chlorate biodegradation · 1994-1997: Research on chlorate degradation continues · Search for funding­ failures continue · CA Dept of Health: 1997, new IC method developed; study

  9. 29 CFR 1917.118 - Fixed ladders.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...) Definitions. (1) Cage (basket guard) means a barrier enclosing or nearly enclosing a ladder's climbing space...) Protection against falls. (1) Fixed ladders more than 20 feet (6.1 m) in height shall be provided with a cage, well, or ladder safety device. (2) When a well or cage is used, ladders with length of climb...

  10. THE SUBMARINE REVIEW FIXED SONAR SYSTEMS

    E-print Network

    THE SUBMARINE REVIEW 1 APRIL 2011 FIXED SONAR SYSTEMS THE HISTORY AND FUTURE OF THE UNDEWATER is the detection of submerged vessels approaching our shores. Since World War I, sonar has been used with varying consuming. A method was sought that could provide the detection capability of sonar without the prohibitive

  11. Why to Treat Subjects as Fixed Effects

    ERIC Educational Resources Information Center

    Adelman, James S.; Estes, Zachary

    2015-01-01

    Adelman, Marquis, Sabatos-DeVito, and Estes (2013) collected word naming latencies from 4 participants who read 2,820 words 50 times each. Their recommendation and practice was that R2 targets set for models should take into account subject idiosyncrasies as replicable patterns, equivalent to a subjects-as-fixed-effects assumption. In light of an…

  12. Fixing Embryos Johnston Lab, November 2003

    E-print Network

    Johnston, Laura

    Fixing Embryos Johnston Lab, November 2003 1 Collect embryos on grape plates that have a dab to collect the excess liquid. Use the squirt bottle with embryo wash to wash embryos from grape plates onto nylon mesh. Use a brush if need be to get all of the embryos. Dechorionate embryos by adding 50% bleach

  13. Prospects of DIS with fixed targets

    SciTech Connect

    Rondio, Ewa

    2005-10-06

    Some prospects for important measurements in Deep Inelastic Scattering on the fixed targets are discussed. The subjects selected are parity violating asymmetries and deeply virtual Compton scattering. The last subject is related to the determination of generalized parton distribution. Possibilities for such measurements in the Compass experiment at CERN with high intensity proton beam are presented.

  14. 75 FR 68215 - Direct Final Rule Staying Numeric Limitation for the Construction and Development Point Source...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-05

    ...the Construction and Development Point Source Category AGENCY: Environmental...the Construction and Development Point Source Category. This action is necessary...the Construction and Development Point Source category. These ELGs...

  15. 75 FR 68305 - Proposed Rule Staying Numeric Limitation for the Construction and Development Point Source Category

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-05

    ...the Construction and Development Point Source Category AGENCY: Environmental...the Construction and Development Point Source Category. This action is necessary...the Construction and Development Point Source category. This stay is...

  16. Action Learning at Work.

    ERIC Educational Resources Information Center

    Mumford, Alan, Ed.

    This book contains 34 papers examining the theory, process, and outcomes of action learning at work. The following papers are included: "An Introduction to the Text" (Alan Mumford); "The Learning Equation" (Reg Revans); "Action Learning as a Vehicle for Learning" (Alan Mumford); "Placing Action Learning and Action Research in Context" (Cliff…

  17. 46 CFR 28.260 - Electronic position fixing devices.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 46 Shipping 1 2010-10-01 2010-10-01 false Electronic position fixing devices. 28.260 Section 28... Trade § 28.260 Electronic position fixing devices. Each vessel 79 feet (24 meters) or more in length must be equipped with an electronic position fixing device capable of providing accurate fixes for...

  18. 50 CFR 660.211 - Fixed gear fishery-definitions.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 50 Wildlife and Fisheries 13 2012-10-01 2012-10-01 false Fixed gear fishery-definitions. 660.211... Groundfish-Limited Entry Fixed Gear Fisheries § 660.211 Fixed gear fishery—definitions. These definitions are specific to the limited entry fixed gear fisheries covered in this subpart. General groundfish...

  19. 50 CFR 660.211 - Fixed gear fishery-definitions.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 50 Wildlife and Fisheries 13 2013-10-01 2013-10-01 false Fixed gear fishery-definitions. 660.211... Groundfish-Limited Entry Fixed Gear Fisheries § 660.211 Fixed gear fishery—definitions. These definitions are specific to the limited entry fixed gear fisheries covered in this subpart. General groundfish...

  20. 50 CFR 660.219 - Fixed gear identification and marking.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 50 Wildlife and Fisheries 13 2013-10-01 2013-10-01 false Fixed gear identification and marking... West Coast Groundfish-Limited Entry Fixed Gear Fisheries § 660.219 Fixed gear identification and marking. (a) Gear identification. (1) Limited entry fixed gear (longline, trap or pot) must be marked...

  1. 50 CFR 660.219 - Fixed gear identification and marking.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 50 Wildlife and Fisheries 11 2011-10-01 2011-10-01 false Fixed gear identification and marking... West Coast Groundfish-Limited Entry Fixed Gear Fisheries § 660.219 Fixed gear identification and marking. (a) Gear identification. (1) Limited entry fixed gear (longline, trap or pot) must be marked...

  2. 50 CFR 660.211 - Fixed gear fishery-definitions.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Fixed gear fishery-definitions. 660.211... Groundfish-Limited Entry Fixed Gear Fisheries § 660.211 Fixed gear fishery—definitions. These definitions are specific to the limited entry fixed gear fisheries covered in this subpart. General groundfish...

  3. 50 CFR 660.219 - Fixed gear identification and marking.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... 50 Wildlife and Fisheries 9 2010-10-01 2010-10-01 false Fixed gear identification and marking. 660... Groundfish-Limited Entry Fixed Gear Fisheries § 660.219 Fixed gear identification and marking. (a) Gear identification. (1) Limited entry fixed gear (longline, trap or pot) must be marked at the surface and at...

  4. 50 CFR 660.219 - Fixed gear identification and marking.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 50 Wildlife and Fisheries 13 2012-10-01 2012-10-01 false Fixed gear identification and marking... West Coast Groundfish-Limited Entry Fixed Gear Fisheries § 660.219 Fixed gear identification and marking. (a) Gear identification. (1) Limited entry fixed gear (longline, trap or pot) must be marked...

  5. 50 CFR 660.211 - Fixed gear fishery-definitions.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 50 Wildlife and Fisheries 11 2011-10-01 2011-10-01 false Fixed gear fishery-definitions. 660.211... Groundfish-Limited Entry Fixed Gear Fisheries § 660.211 Fixed gear fishery—definitions. These definitions are specific to the limited entry fixed gear fisheries covered in this subpart. General groundfish...

  6. 46 CFR 28.260 - Electronic position fixing devices.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 1 2014-10-01 2014-10-01 false Electronic position fixing devices. 28.260 Section 28... Trade § 28.260 Electronic position fixing devices. Each vessel 79 feet (24 meters) or more in length must be equipped with an electronic position fixing device capable of providing accurate fixes for...

  7. 46 CFR 28.260 - Electronic position fixing devices.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 1 2011-10-01 2011-10-01 false Electronic position fixing devices. 28.260 Section 28... Trade § 28.260 Electronic position fixing devices. Each vessel 79 feet (24 meters) or more in length must be equipped with an electronic position fixing device capable of providing accurate fixes for...

  8. 46 CFR 28.260 - Electronic position fixing devices.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... 46 Shipping 1 2012-10-01 2012-10-01 false Electronic position fixing devices. 28.260 Section 28... Trade § 28.260 Electronic position fixing devices. Each vessel 79 feet (24 meters) or more in length must be equipped with an electronic position fixing device capable of providing accurate fixes for...

  9. 46 CFR 28.260 - Electronic position fixing devices.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 1 2013-10-01 2013-10-01 false Electronic position fixing devices. 28.260 Section 28... Trade § 28.260 Electronic position fixing devices. Each vessel 79 feet (24 meters) or more in length must be equipped with an electronic position fixing device capable of providing accurate fixes for...

  10. Assisting People with Developmental Disabilities to Improve Pointing Efficiency with an Automatic Pointing Assistive Program

    ERIC Educational Resources Information Center

    Shih, Ching-Hsiang; Hsu, Nai-Yun; Shih, Ching-Tien

    2009-01-01

    This study evaluated whether two children with developmental disabilities would be able to improve their pointing performance through an Automatic Pointing Assistive Program (APAP) and a newly developed mouse driver (i.e. a new mouse driver replaces standard mouse driver, and is able to intercept mouse click action). Initially, both participants…

  11. Action spectrum for phototherapy of psoriasis

    SciTech Connect

    Parrish, J.A.; Jaenicke, K.F.

    1981-05-01

    Using a monochromator the action spectrum for ultraviolet phototherapy of psoriasis was determined for radiation between 254 and 313 nm and compared to the action spectrum for erythema of uninvolved adjacent skin. Daily exposures of different doses of 254, 280, 290, 296, 300, 304 and 313 nm radiation were observed. Wavelengths of 254, 280, 290 nm were erythemogenic but not therapeutic even at 10 to 50 times the minimal erythema dose. At the other wavelengths studied, the 2 action spectra were similar. In general, fixed daily doses cleared at lower cumulative dose than did incrementally increased daily doses. The small number of suberythemogenic exposure doses required suggests that monochromatic radiation may have advantages over broadband sources.

  12. Nonlinear inferential cascade control of exothermic fixed-bed reactors

    SciTech Connect

    Hua, X.; Jutan, A.

    2000-05-01

    A nonlinear inferential cascade control strategy for a tubular fixed-bed reactor with highly exothermic reaction is presented. Tight control of exit conversion and stabilization of hot-spot temperature was achieved over a wide range of operating conditions. A multiple cascade structure was developed by lumping the distributed-parameter system and partitioning it into three subsystems. Practical issues of implementing the control system are addressed, as well as physical insight and assumptions used for model reduction of each subsystem. The direct synthesis approach for nonlinear control systems is used to design the controllers of the important subsystems separately. A lag was added in the primary subsystem, and fast stabilization of the secondary subsystem was implemented. Unknown temperature states and inlet concentration were estimated by a nonlinear observer from only a few temperature measurements. The control problem of the moving hot-spot temperature was also addressed. Simulation on an industrial phthalic anhydride fixed-bed reactor showed that the observer can give excellent dynamic tracking of the reactor. The resulting cascade control system can achieve good set-point tracking and disturbance rejection performance, which is robust in the presence of measurement error and model mismatch, and superior to a single-loop control system.

  13. 78 FR 20705 - Fixed Income Roundtable

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-05

    ...Commission. ACTION: Notice of roundtable discussion; request for comment...securities markets. The roundtable discussion will be held in the multi-purpose...is invited to observe the roundtable discussion. Seating will be available on a...

  14. Deriving Motor Primitives Through Action Segmentation

    PubMed Central

    Hemeren, Paul E.; Thill, Serge

    2011-01-01

    The purpose of the present experiment is to further understand the effect of levels of processing (top-down vs. bottom-up) on the perception of movement kinematics and primitives for grasping actions in order to gain insight into possible primitives used by the mirror system. In the present study, we investigated the potential of identifying such primitives using an action segmentation task. Specifically, we investigated whether or not segmentation was driven primarily by the kinematics of the action, as opposed to high-level top-down information about the action and the object used in the action. Participants in the experiment were shown 12 point-light movies of object-centered hand/arm actions that were either presented in their canonical orientation together with the object in question (top-down condition) or upside down (inverted) without information about the object (bottom-up condition). The results show that (1) despite impaired high-level action recognition for the inverted actions participants were able to reliably segment the actions according to lower-level kinematic variables, (2) segmentation behavior in both groups was significantly related to the kinematic variables of change in direction, velocity, and acceleration of the wrist (thumb and finger tips) for most of the included actions. This indicates that top-down activation of an action representation leads to similar segmentation behavior for hand/arm actions compared to bottom-up, or local, visual processing when performing a fairly unconstrained segmentation task. Motor primitives as parts of more complex actions may therefore be reliably derived through visual segmentation based on movement kinematics. PMID:21833296

  15. A method for preparing spaceflight RNAlater-fixed Arabidopsis thaliana (Brassicaceae) tissue for scanning electron microscopy1

    PubMed Central

    Schultz, Eric R.; Kelley, Karen L.; Paul, Anna-Lisa; Ferl, Robert J.

    2013-01-01

    • Premise of the study: In spaceflight experiments, tissues for morphologic study are fixed in 3% glutaraldehyde, while tissues for molecular study are fixed in RNAlater; thus, an experiment containing both study components requires multiple fixation strategies. The possibility of using RNAlater-fixed materials for standard SEM-based morphometric investigation was explored to expand the library of tissues available for analysis and maximize usage of samples returned from spaceflight, but these technologies have wide application to any situation where recovery of biological resources is limited. • Methods and Results: RNAlater-fixed samples were desalinated in distilled water, dehydrated through graded methanol, plunged into liquid ethane, and transferred to cryovials for freeze-substitution. Sample tissues were critical point dried, mounted, sputter-coated, and imaged. • Conclusions: The protocol resulted in acceptable SEM images from RNAlater-fixed Arabidopsis thaliana tissue. The majority of the tissues remained intact, including general morphology and finer details such as root hairs and trichomes. PMID:25202579

  16. Human choice in "counterintuitive" situations: fixed- versus progressive-ratio schedules.

    PubMed Central

    Wanchisen, B A; Tatham, T A; Hineline, P N

    1992-01-01

    College undergraduates were given repeated opportunities to choose between a fixed-ratio and a progressive-ratio schedule of reinforcement. Completions of a progressive-ratio schedule produced points (exchangeable for money) and incremented that response requirement by 20 responses with each consecutive choice. In the reset condition, completion of a fixed ratio produced the same number of points and also reset the progressive ratio back to its initial value. In the no-reset condition, the progressive ratio continued to increase by increments of 20 throughout the session with each successive selection of this schedule, irrespective of fixed-ratio choices. Subjects' schedule choices were sensitive to parametric manipulations of the size of the fixed-ratio schedule and were consistent with predictions made on the basis of minimizing the number of responses emitted per point earned, which is a principle of most optimality theories. Also, the present results suggest that if data from human performances are to be compared with results for other species, humans should be exposed to schedules of reinforcement for long periods of time, as is commonly done with nonhuman subjects. PMID:1645102

  17. View-invariant Action Recognition from Point Triplets

    E-print Network

    Foroosh, Hassan

    - spective distortions, differences in viewpoints, unknown camera parameters, anthropometric variations. Moreover, our formulation relaxes restrictive anthropometric assumptions such as isometry. This is due

  18. Ellipsoidal Effects in the Fixed Geodetic Boundary Value Problem

    NASA Astrophysics Data System (ADS)

    Heck, Bernhard; Seitz, Kurt

    2014-05-01

    After applying topographic reductions and downward continuation on the observed boundary data the linearized Geodetic Boundary Value Problem (GBVP) degenerates into an ellipsoidal problem. Although the ellipsoidal boundary surface possesses a much simpler topology than the original topographical surface of the Earth, this simplified problem still cannot be solved in an elementary analytical way; in contrast, the "simple" GBVP related to a spherical boundary surface and the normal (radial) derivative is rigorously solvable by spherical integral formulae. In the past, various approaches have been developed for approximate solutions of the ellipsoidal GBVP, starting from the classical work by Sagrebin (1956). These approaches, mainly applied to the free GBVP, rely on first order approximations with respect to the flattening of the ellipsoid of revolution and can be subdivided in three groups. The first group is based on modifications of the spherical integral kernel, resulting in anisotropic kernel functions depending on the azimuth between the computation point and the moving integration point. In the second group the boundary data are reduced for "ellipsoidal effects" and inserted into spherical integral formulae. Finally, in the third group the ellipsoidal boundary data is formally inserted into the spherical solution formula, and a correction term is added for consideration of the ellipsoidal effect. An advantage of the third approach, propagated by Heck and Seitz (2003) for the linearized scalar-free GBVP, consists in the fact that the correction term can easily be evaluated from some global geopotential model in the form of a spherical harmonic series. In the paper the three groups of approaches are discussed for the case of the fixed GBVP. A first-order solution of the fixed GBVP related to an ellipsoidal boundary is derived in detail according to the procedure presented in Heck and Seitz (2003). Finally, the resulting ellipsoidal correction term is investigated numerically in the space as well as in the frequency domain.

  19. ACTIONS AND PARTIAL ACTIONS OF INDUCTIVE CONSTELLATIONS

    E-print Network

    ACTIONS AND PARTIAL ACTIONS OF INDUCTIVE CONSTELLATIONS VICTORIA GOULD AND CHRISTOPHER HOLLINGS Abstract. Inductive constellations are one-sided analogues of inductive cat- egories which correspond constellation on a set, before introducing the Szendrei expansion of an induc- tive constellation, which

  20. ACTIONS AND PARTIAL ACTIONS OF INDUCTIVE CONSTELLATIONS

    E-print Network

    Gould, Victoria

    ACTIONS AND PARTIAL ACTIONS OF INDUCTIVE CONSTELLATIONS VICTORIA GOULD AND CHRISTOPHER HOLLINGS Abstract. Constellations were recently introduced by the authors as one- sided analogues of categories: a constellation is equipped with a partial multi- plication for which `domains' are defined but, in general

  1. RSRM nozzle fixed housing cooldown test

    NASA Technical Reports Server (NTRS)

    Bolieau, D. J.

    1989-01-01

    Flight 5 aft segments with nozzles were exposed to -17 F temperatures while awaiting shipment to KSC in February, 1989. No records were found which show that any previous nozzles were exposed to air temperatures as low as those seen by the Flight 5 nozzles. Thermal analysis shows that the temperature of the fixed housing, and forward and aft exit cone components dropped as low as -10 F. Structural analysis of the nozzles at these low temperatures show the forward and aft exit cone adhesive bonds to have a positive margin of safety, based on a 2.0 safety factor. These analyses show the normal and shear stresses in the fixed housing bond as low values. However, the hoop and meridinal stresses were predicted to be in the 4000 psi range; the failure stress allowable of EA913NA adhesive at -7 F. If the bonds did break in directions perpendicular to the surfaces, called bond crazing, no normal bond strength would be lost. Testing was conducted in two phases, showing that no degradation to the adhesive bonds occurred while the Flight 5 nozzles were subjected to subzero temperatures. The results of these tests are documented. Phase 1 testing cooled a full-scale RSRM insulated fixed housing to -13 F, with extensive bondline inspections. Phase 2 testing cooled the witness panel adhesive tensile buttions to -13 F, with failure strengths recorded before, during, and after the cooldown.

  2. Characterizing configurations of fire ignition points through spatiotemporal point processes

    NASA Astrophysics Data System (ADS)

    Comas, C.; Costafreda-Aumedes, S.; Vega-Garcia, C.

    2014-04-01

    Human-caused forest fires are usually regarded as unpredictable but often exhibit trends towards clustering in certain locations and periods. Characterizing such configurations is crucial for understanding spatiotemporal fire dynamics and implementing preventive actions. Our objectives were to analyse the spatiotemporal point configuration and to test for spatiotemporal interaction. We characterized the spatiotemporal structure of 984 fire ignition points in a study area of Galicia, Spain, during 2007-2011 by the K-Ripley's function. Our results suggest the presence of spatiotemporal structures for time lags of less than two years and ignition point distances in the range 0-12 km. Ignition centre points at time lags of less than 100 days are aggregated for any inter-event distance. This cluster structure loses strength as the time lag increases, and at time lags of more than 365 days this cluster structure is not significant for any lag distance. Our results also suggest spatiotemporal interdependencies at time lags of less than 100 days and inter-event distances of less than 10 km. At time lags of up to 365 days spatiotemporal components are independent for any point distance. These results suggest that risk conditions occur locally and are short-lived in this study area.

  3. Variation in the action spectrum of erythrolabe among deuteranopes.

    PubMed Central

    Alpern, M; Pugh, E N

    1977-01-01

    1. Eight deuteranopes matched a mixture of a monochromatic light on the long wave side of the neutral point and a violet (450 nm) primary to a fixed white as well as a monochromatic light on the short wave side of the neutral point mixed with a red (650 nm) primary, to the same white. For lambda greater than 530 nm, the former set of matches defined the action spectrum of the long wave sensitive foveal cones, and for lambda less than 480 nm, the latter that of the short wave sensitive cones. 2. Individual differences in the former matches were approximately correlated with the respective ratio of the sensitivities of the wave-length of the anomaloscope primaries, in a way that individual differences of the latter were not. 3. Assuming that eye media differences alone account for the differences in long wave sensitive foveal action spectra, the spectral reflectivity of the foveal fundus was predicted for these deuteranopes. The prediction is inconsistent with measurement. 4. Thirteen deuteranopes matched monochromatic spectral lights with a green (535 nm) and a blue (460 nm) primary. The result were analysed by von Kries' method in which differences in matching due to differences in eye media absorption are obviated. The matches of five differed significantly from one another when so analysed. It was concluded that at least one of two action spectra of the foveal cones of every one of these five differed from that of all of the others. 5. The canon that deuteranopes accept normal colour matches was evaluated by confronting a single normal with five deuternopes in the analytical anomaloscope of Baker & Rushton, set in the mode of each of the five in turn. Obvious differences existed between this normal's matches and those of four of five deuteranopes. 6. Explanations for differences in the spectrum of erythrolabe in different deuteranopes are evaluated. The possibilities that all have the identical visual pigment but (a) in cones with different optical funnelling properties or (b) in different optical densities are considered. Preliminary results are not in agreement with the expectations of either of these ideas. 7. It is suggested that the visual pigment in the foveal long wave sensitive cones of different deuternopes (and of different normals) may have different extinction spectra. The idea is consistent with micro-spectrophotometric measurements of rhodopsin in individual rods from different frogs (Bowmaker, Loew & Leibman, 1975). PMID:301186

  4. FAT POINT MODULES OVER GENERALIZED LAURENT POLYNOMIAL RINGS

    E-print Network

    Goetz, Peter

    FAT POINT MODULES OVER GENERALIZED LAURENT POLYNOMIAL RINGS Pete Goetz Department of Mathematics result is the classification of all fat point modules for each algebra in the family. We also consider the action of the shift functor s and prove s has infinite order on a fat point module F precisely when

  5. Action understanding and active inference

    PubMed Central

    Mattout, Jérémie; Kilner, James

    2012-01-01

    We have suggested that the mirror-neuron system might be usefully understood as implementing Bayes-optimal perception of actions emitted by oneself or others. To substantiate this claim, we present neuronal simulations that show the same representations can prescribe motor behavior and encode motor intentions during action–observation. These simulations are based on the free-energy formulation of active inference, which is formally related to predictive coding. In this scheme, (generalised) states of the world are represented as trajectories. When these states include motor trajectories they implicitly entail intentions (future motor states). Optimizing the representation of these intentions enables predictive coding in a prospective sense. Crucially, the same generative models used to make predictions can be deployed to predict the actions of self or others by simply changing the bias or precision (i.e. attention) afforded to proprioceptive signals. We illustrate these points using simulations of handwriting to illustrate neuronally plausible generation and recognition of itinerant (wandering) motor trajectories. We then use the same simulations to produce synthetic electrophysiological responses to violations of intentional expectations. Our results affirm that a Bayes-optimal approach provides a principled framework, which accommodates current thinking about the mirror-neuron system. Furthermore, it endorses the general formulation of action as active inference. PMID:21327826

  6. Gauge invariant 1PI effective action for superstring field theory

    NASA Astrophysics Data System (ADS)

    Sen, Ashoke

    2015-06-01

    We construct gauge invariant 1PI effective action for the NS sector of type II and heterotic string field theory. By construction, zero eigenvalues of the kinetic operator of this action determine the renormalized physical masses, and tree level amplitudes computed from this action (after gauge fixing) give the loop corrected S-matrix elements. Using this formalism we can give a simple proof of the result that the renormalized physical masses do not depend on the choice of local coordinate system and locations of picture changing operators used in defining the off-shell amplitude. We also eliminate the need for an infrared regulator in dealing with tadpoles of massless fields.

  7. Running boundary actions, Asymptotic Safety, and black hole thermodynamics

    NASA Astrophysics Data System (ADS)

    Becker, Daniel; Reuter, Martin

    2012-07-01

    Previous explorations of the Asymptotic Safety scenario in Quantum Einstein Gravity (QEG) by means of the effective average action and its associated functional renormalization group (RG) equation assumed spacetime manifolds which have no boundaries. Here we take a first step towards a generalization for non-trivial boundaries, restricting ourselves to action functionals which are at most of second order in the derivatives acting on the metric. We analyze two examples of truncated actions with running boundary terms: full fledged QEG within the single-metric Einstein-Hilbert truncation, augmented by a scale dependent Gibbons-Hawking surface term, and a bi-metric truncation for gravity coupled to scalar matter fields. The latter contains 17 running couplings, related to both bulk and boundary terms, whose beta-functions are computed in the induced gravity approximation (large N limit). We find that the bulk and the boundary Newton constant, pertaining to the Einstein-Hilbert and Gibbons-Hawking term, respectively, show opposite RG running; proposing a scale dependent variant of the ADM mass we argue that the running of both couplings is consistent with gravitational anti-screening. We discuss the status of the `bulk-boundary matching' usually considered necessary for a well defined variational principle within the functional RG framework, and we explain a number of conceptual issues related to the `zoo' of (Newton-type, for instance) coupling constants, for the bulk and the boundary, which result from the bi-metric character of the gravitational average action. In particular we describe a simple device for counting the number of field modes integrated out between the infrared cutoff scale and the ultraviolet. This method makes it manifest that, in an asymptotically safe theory, there are effectively no field modes integrated out while the RG trajectory stays in the scaling regime of the underlying fixed point. As an application, we investigate how the semiclassical theory of Black Hole Thermodynamics gets modified by quantum gravity effects and compare the new picture to older work on `RG-improved black holes' which incorporated the running of the bulk Newton constant only. We find, for instance, that the black hole's entropy vanishes and its specific heat capacity turns positive at Planckian scales.

  8. Action recognition through discovering distinctive action parts.

    PubMed

    Chen, Feifei; Sang, Nong; Kuang, Xiaoqin; Gan, Haitao; Gao, Changxin

    2015-02-01

    Recent methods based on midlevel visual concepts have shown promising capabilities in the human action recognition field. Automatically discovering semantic entities such as action parts remains challenging. In this paper, we present a method of automatically discovering distinctive midlevel action parts from video for recognition of human actions. We address this problem by learning and selecting a collection of discriminative and representative action part detectors directly from video data. We initially train a large collection of candidate exemplar-linear discriminant analysis detectors from clusters obtained by clustering spatiotemporal patches in whitened space. To select the most effective detectors from the vast array of candidates, we propose novel coverage-entropy curves (CE curves) to evaluate a detector's capability of distinguishing actions. The CE curves characterize the correlation between the representative and discriminative power of detectors. In the experiments, we apply the mined part detectors as a visual vocabulary to the task of action recognition on four datasets: KTH, Olympic Sports, UCF50, and HMDB51. The experimental results demonstrate the effectiveness of the proposed method and show the state-of-the-art recognition performance. PMID:26366588

  9. Efficient particle-mesh Ewald based approach to fixed and induced dipolar interactions

    NASA Astrophysics Data System (ADS)

    Toukmaji, Abdulnour; Sagui, Celeste; Board, John; Darden, Tom

    2000-12-01

    We have implemented classical Ewald and particle-mesh Ewald (PME) based treatments of fixed and induced point dipoles into the sander molecular dynamics (MD) module of AMBER 6. During MD the induced dipoles can be propagated along with the atomic positions either by iteration to self-consistency at each time step, or by a Car-Parrinello (CP) technique using an extended Lagrangian formalism. In this paper we present the derivation of the new algorithms and compare the various options with respect to accuracy, efficiency, and effect on calculated properties of a polarizable water model. The use of PME for electrostatics of fixed charges and induced dipoles together with a CP treatment of dipole propagation in MD simulations leads to a cost overhead of only 33% above that of MD simulations using standard PME with fixed charges, allowing the study of polarizability in large macromolecular systems.

  10. Derivative actions in China 

    E-print Network

    Lin, Shaowei

    2014-07-02

    The enactment of derivative action was expected to be actively used by shareholders to protect their interests. In fact, it turned out that this reform effort seemed futile as the right to engage in such actions was ...

  11. Chemistry Department Emergency Action &

    E-print Network

    Guo, Ting

    ;2 Introduction An Emergency Action & Evacuation Plan (herein referred to as an EAP) covers designated actions and notify employees of an emergency Evacuation procedures and emergency escape routes A procedure

  12. Manipulation with diverse actions

    E-print Network

    Barry, Jennifer L. (Jennifer Lynn)

    2013-01-01

    We define the Diverse Action Manipulation (DAMA) problem in which we are given a mobile robot, a set of movable objects, and a set of diverse, possibly non-prehensile manipulation actions, and the objective is to find a ...

  13. Balance between absorbing and positive fixed points in resource consumption models.

    PubMed

    Behar, Hilla; Shnerb, Nadav; Louzoun, Yoram

    2012-09-01

    The effect of resource usage on economic growth has been studied in multiple models. However, the generic effect of improving resource usage efficacy through improved technical skills has not been studied in detail. We here analyze a model incorporating resource usage by capital and the parallel production of technical skill in order to study the effect of improving the efficacy of resources usage with advanced technologies. We show that a practically inevitable result of such a model is that improving the resource usage efficacy leads to a lower steady-state level of resources. A surprising conclusion from ordinary differential equations realization of the model is an extreme sensitivity to parameters, where a small parameter change can lead to an irreversible state through a hysteresis mechanism between a scenario of a collapse of the economy and a scenario of sustainable economy. This sensitivity is lost when spatial stochastic simulations are performed. In the stochastic regime the two scenarios coexist, with different fractions of the lattice residing in each state. Changing parameters smoothly changes the fraction of lattice sites in each state. The transition between the collapsed economy and the sustainable one is not symmetrical. Escape from the collapsed situation can only occur through diffusion from neighboring sustained lattice sites. On the other hand, the collapse can occur even in the absence of diffusion. This difference leads to diffusion dependent capital growth, where an optimal capital is obtained for middiffusion values. Such a transition may actually be generic phenomena in ecological and economic systems. PMID:23030905

  14. Balance between absorbing and positive fixed points in resource consumption models

    NASA Astrophysics Data System (ADS)

    Behar, Hilla; Shnerb, Nadav; Louzoun, Yoram

    2012-09-01

    The effect of resource usage on economic growth has been studied in multiple models. However, the generic effect of improving resource usage efficacy through improved technical skills has not been studied in detail. We here analyze a model incorporating resource usage by capital and the parallel production of technical skill in order to study the effect of improving the efficacy of resources usage with advanced technologies. We show that a practically inevitable result of such a model is that improving the resource usage efficacy leads to a lower steady-state level of resources. A surprising conclusion from ordinary differential equations realization of the model is an extreme sensitivity to parameters, where a small parameter change can lead to an irreversible state through a hysteresis mechanism between a scenario of a collapse of the economy and a scenario of sustainable economy. This sensitivity is lost when spatial stochastic simulations are performed. In the stochastic regime the two scenarios coexist, with different fractions of the lattice residing in each state. Changing parameters smoothly changes the fraction of lattice sites in each state. The transition between the collapsed economy and the sustainable one is not symmetrical. Escape from the collapsed situation can only occur through diffusion from neighboring sustained lattice sites. On the other hand, the collapse can occur even in the absence of diffusion. This difference leads to diffusion dependent capital growth, where an optimal capital is obtained for middiffusion values. Such a transition may actually be generic phenomena in ecological and economic systems.

  15. Anomalous scaling at non-thermal fixed points of Burgers' and Gross-Pitaevskii turbulence

    E-print Network

    Steven Mathey; Thomas Gasenzer; Jan M. Pawlowski

    2015-08-26

    Scaling in the dynamical properties of complex many-body systems has been of strong interest since turbulence phenomena became the subject of systematic mathematical studies. In this article, dynamical critical phenomena far from equilibrium are investigated with functional renormalisation group equations. The focus is set on scaling solutions of the stochastic driven-dissipative Burgers equation and their relation to solutions known in the literature for Burgers and Kardar-Parisi-Zhang dynamics. We furthermore relate superfluid as well as acoustic turbulence described by the Gross-Pitaevskii model to known analytic and numerical results for scaling solutions. In this way, the canonical Kolmogorov exponent 5/3 for the energy cascade in superfluid turbulence is obtained analytically. We also get first results for anomalous exponents of acoustic and quantum turbulence. These are consistent with existing experimental data. Our results should be relevant for future experiments with, e.g., exciton-polariton condensates in solid-state systems as well as with ultra-cold atomic gases.

  16. A primal dual fixed point algorithm for constrained optimization problems with applications to image reconstruction

    NASA Astrophysics Data System (ADS)

    Tang, Yuchao

    2015-03-01

    Computed tomography (CT) image reconstruction problems can be solved by finding the minimization of a suitable objective function. The first-order methods for image reconstruction in CT have been popularized in recent years. These methods are interesting because they need only the first derivative information of the objective function and can solve non-smooth regularization functions. In this paper, we consider a constrained optimization problem which often appeared in the CT image reconstruction problems. For the unconstrained case, it has been studied recently. We dedicate to propose an efficient algorithm to solve the constrained optimization problem. Numerical experiments to image reconstruction benchmark problem show that the proposed algorithms can produce better reconstructed images in signal-to-noise than the original algorithm and other state-of-the-art methods.

  17. A Survey of LR-Parsing Methods The Graph Method For Computing Fixed Points

    E-print Network

    Gallier, Jean

    with a brief presentation of LR(1) parsers. 1 #12;1 LR(0)-Characteristic Automata The purpose of LR to obtain an SLR(k) or an LALR(k) parser from an LR(0) parser is the computation of lookahead sets of FIRST, FOLLOW, and LALR(1) Lookahead Sets Jean Gallier Department of Computer and Information Science

  18. Lyapunov Functions in Piecewise Linear Systems: From Fixed Point to Limit Cycle

    E-print Network

    Yian Ma; Ruoshi Yuan; Yang Li; Ping Ao; Bo Yuan

    2013-06-28

    This paper provides a first example of constructing Lyapunov functions in a class of piecewise linear systems with limit cycles. The method of construction helps analyze and control complex oscillating systems through novel geometric means. Special attention is stressed upon a problem not formerly solved: to impose consistent boundary conditions on the Lyapunov function in each linear region. By successfully solving the problem, the authors construct continuous Lyapunov functions in the whole state space. It is further demonstrated that the Lyapunov functions constructed explain for the different bifurcations leading to the emergence of limit cycle oscillation.

  19. Hopf-saddle-node bifurcation for fixed points of 3D-diffeomorphisms

    E-print Network

    bifurcations. Quasi-periodic bifurcations of an invariant circle, forming a frayed boundary, are numerically `bubble' Henk Broer , Carles Sim´o and Renato Vitolo July 16, 2007 Abstract The dynamics near a Hopf-like structure exists in the neighbourhood, formed by two surfaces of saddle-node and a surface of Hopf

  20. The Hopfsaddlenode bifurcation for fixed points of 3Ddi#eomorphisms

    E-print Network

    . . . . . . . . . . . . . . . . . . . . . 5 2 The 1:5 resonance `bubble' 7 2.1 Destruction of the 1:5­resonant invariant circle of the Poincarâ??e­Takens vector field normal form. The model dynamics is systematically explored by computation of Lyapunov exponents and numeri­ cal continuation of quasi­periodic invariant circles and their bifurcations

  1. Anomalous scaling at nonthermal fixed points of Burgers' and Gross-Pitaevskii turbulence

    NASA Astrophysics Data System (ADS)

    Mathey, Steven; Gasenzer, Thomas; Pawlowski, Jan M.

    2015-08-01

    Scaling in the dynamical properties of complex many-body systems has been of strong interest since turbulence phenomena became the subject of systematic mathematical studies. In this article, dynamical critical phenomena far from equilibrium are investigated with functional renormalization-group equations. The focus is set on scaling solutions of the stochastic driven-dissipative Burgers equation and their relation to solutions known in the literature for Burgers' and Kardar-Parisi-Zhang dynamics. We furthermore relate superfluid as well as acoustic turbulence described by the Gross-Pitaevskii model to known analytic and numerical results for scaling solutions. In this way, the canonical Kolmogorov exponent 5/3 for the energy cascade in superfluid turbulence is obtained analytically. We also get results for anomalous exponents of acoustic and quantum turbulence. These are consistent with existing experimental data. Our results should be relevant for future experiments with, e.g., exciton-polariton condensates in solid-state systems as well as with ultracold atomic gases.

  2. Final Report for "Infrared Fixed Points in Multiflavor Lattice Gauge Theory"

    SciTech Connect

    Meurice, Yannick; Sinclair, Donald K.

    2013-09-27

    The goal of the grant was to apply methods that we have developed with spin and pure gauge models to models with dynamical fermions which are considered as candidates for an alternative to the Higgs mechanism. The work on SU(3) with fundamental quarks and with sextet quarks is described.

  3. AN ASYMPTOTICALLY LINEAR FIXED POINT EXTENSION OF THE INF-SUP

    E-print Network

    Jerome, Joseph W.

    for positive-definite, self-adjoint linear equations rests upon two fundamental results, viz. , the Bramble polynomial trial spaces, while the second is generic to Galerkin approximation. The purpose of the Bramble

  4. Fixed-Point Optimization of Atoms and Density in DFT L. D. Marks*

    E-print Network

    Marks, Laurence D.

    with fictitious masses and a solution of Newton's laws of motion involving wave functions. Somewhat similar of the dielectric response and elastic waves using known results for quasi-Newton methods. The analysis indicates

  5. Fixed Point Theorems for Dissipative Mappings in Complete Probabilistic Metric Spaces.

    E-print Network

    Khamsi, Mohamed Amine

    as a definition of a E-dissipative mapping. The correspondent physical situation corresponds to the irreversible. Khamsi, Department of Mathematical Sciences, Vladik Ya. Kreinovich, Computer Science department, The University of Texas at El Paso. Abstract the physical notion of dissipative process gave rise

  6. Numerical Shadowing Using Componentwise Bounds and a Sharper Fixed Point Result

    E-print Network

    Van Vleck, Erik

    2001-03-05

    error bounds to use relatively smaller error tolerances in nonhyperbolic and contractive directions (i.e., in directions corresponding to zero and negative Lyapunov exponents). The result is a decrease in the shadowing global error....

  7. LONG PATH DIFFERENTIAL OPTICAL ABSORPTION SPECTROMETER AND EPA-APPROVED FIXED POINT METHODS INTERCOMPARISON

    EPA Science Inventory

    Differential optical absorption spectrometry (DOAS) has been used by a number of investigators over the past 10 years to measure a wide range of gaseous air pollutants. ecently OPSIS AB, Lund, Sweden, has developed and made commercially available DOAS instrument that has a number...

  8. Applied Dynamical Systems Problem Sheet 2 1. Find and classify the fixed points for

    E-print Network

    Burton, Geoffrey R.

    in nonlinear electric circuits, and has also been used to model neurons and tectonic plates: ¨x + b(x2 - 1) x that this is indeed the flow of the logistic differential equation. 4. The Fibonacci sequence Fn satisfies Fn = Fn-1

  9. Planning as Action Research

    ERIC Educational Resources Information Center

    de Gonzalez, Carmen Beatriz; Hernandez, Teresa; Kusch, Jim; Ryan, Charly

    2004-01-01

    Planning contains so much more than the written plan. Early in 2000, an invitation came from the Collaborative Action Research Network (CARN), to people experienced in action research who might want to help plan and present an action research event for elementary school science teachers in Venezuela, South America, in Autumn 2000. This article…

  10. POSITION MANAGEMENT ACTION FORM

    E-print Network

    Su, Xiao

    POSITION MANAGEMENT ACTION FORM HUMAN RESOURCES | 408-924-2250 classcomp@sjsu.edu HR Revised 12/15/2014 Page 1 of 2 Instructions: 1. To be used for all position management actions. Actions may include updating an existing position, establishing a new position, or changing the funding of a position. (For

  11. Participatory Action Research.

    ERIC Educational Resources Information Center

    Walker, Martha Lentz

    1993-01-01

    Describes aspects of participatory action research and considers advantages of using participatory action research in research by disabilities and rehabilitation researchers. Notes that participatory action research can be built into any rehabilitation research design but that it rests upon the recognition of persons with disabilities as integral…

  12. Conservation Action Handbook.

    ERIC Educational Resources Information Center

    National Rifle Association, Washington, DC.

    Conservation problems are identified, with some suggestions for action. General areas covered are: Wildlife Conservation, Soil Conservation, Clean Water, Air Pollution Action, and Outdoor Recreation Action. Appendices list private organizations or agencies concerned with natural resource use and/or management, congressional committees considering…

  13. FixMahonian Calculus, II: further statistics Dominique Foata and GuoNiu Han

    E-print Network

    Foata, Dominique

    : the vertical arrow (fix, maz, Der) F3 ---# (fix, maf, Der) (here rewritten horizontally for typographical) # = (fix, maf, Der) F 3 (#) for all #. The remaining statistics are now introduced together with the main, maf) (PIX, mag) (fix, maj, Der) (fix, DES) (PIX, inv) (pix, inv) (fix, maz, Der) (fix, maf, Der) (fix

  14. Ash level meter for a fixed-bed coal gasifier

    DOEpatents

    Fasching, George E. (Morgantown, WV)

    1984-01-01

    An ash level meter for a fixed-bed coal gasifier is provided which utilizes the known ash level temperature profile to monitor the ash bed level. A bed stirrer which travels up and down through the extent of the bed ash level is modified by installing thermocouples to measure the bed temperature as the stirrer travels through the stirring cycle. The temperature measurement signals are transmitted to an electronic signal process system by an FM/FM telemetry system. The processing system uses the temperature signals together with an analog stirrer position signal, taken from a position transducer disposed to measure the stirrer position to compute the vertical location of the ash zone upper boundary. The circuit determines the fraction of each total stirrer cycle time the stirrer-derived bed temperature is below a selected set point, multiplies this fraction by the average stirrer signal level, multiplies this result by an appropriate constant and adds another constant such that a 1 to 5 volt signal from the processor corresponds to a 0 to 30 inch span of the ash upper boundary level. Three individual counters in the processor store clock counts that are representative of: (1) the time the stirrer temperature is below the set point (500.degree. F.), (2) the time duration of the corresponding stirrer travel cycle, and (3) the corresponding average stirrer vertical position. The inputs to all three counters are disconnected during any period that the stirrer is stopped, eliminating corruption of the measurement by stirrer stoppage.

  15. Metabolic syndrome in fixed-shift workers.

    PubMed

    Canuto, Raquel; Pattussi, Marcos Pascoal; Macagnan, Jamile Block Araldi; Henn, Ruth Liane; Olinto, Maria Teresa Anselmo

    2015-01-01

    OBJECTIVE To analyze if metabolic syndrome and its altered components are associated with demographic, socioeconomic and behavioral factors in fixed-shift workers. METHODS A cross-sectional study was conducted on a sample of 902 shift workers of both sexes in a poultry processing plant in Southern Brazil in 2010. The diagnosis of metabolic syndrome was determined according to the recommendations from Harmonizing the Metabolic Syndrome. Its frequency was evaluated according to the demographic (sex, skin color, age and marital status), socioeconomic (educational level, income and work shift), and behavioral characteristics (smoking, alcohol intake, leisure time physical activity, number of meals and sleep duration) of the sample. The multivariate analysis followed a theoretical framework for identifying metabolic syndrome in fixed-shift workers. RESULTS The prevalence of metabolic syndrome in the sample was 9.3% (95%CI 7.4;11.2). The most frequently altered component was waist circumference (PR 48.4%; 95%CI 45.5;51.2), followed by high-density lipoprotein. Work shift was not associated with metabolic syndrome and its altered components. After adjustment, the prevalence of metabolic syndrome was positively associated with women (PR 2.16; 95%CI 1.28;3.64), workers aged over 40 years (PR 3.90; 95%CI 1.78;8.93) and those who reported sleeping five hours or less per day (PR 1.70; 95%CI 1.09;2.24). On the other hand, metabolic syndrome was inversely associated with educational level and having more than three meals per day (PR 0.43; 95%CI 0.26;0.73). CONCLUSIONS Being female, older and deprived of sleep are probable risk factors for metabolic syndrome, whereas higher educational level and higher number of meals per day are protective factors for metabolic syndrome in fixed-shift workers. PMID:26061455

  16. Metabolic syndrome in fixed-shift workers

    PubMed Central

    Canuto, Raquel; Pattussi, Marcos Pascoal; Macagnan, Jamile Block Araldi; Henn, Ruth Liane; Olinto, Maria Teresa Anselmo

    2015-01-01

    OBJECTIVE To analyze if metabolic syndrome and its altered components are associated with demographic, socioeconomic and behavioral factors in fixed-shift workers. METHODS A cross-sectional study was conducted on a sample of 902 shift workers of both sexes in a poultry processing plant in Southern Brazil in 2010. The diagnosis of metabolic syndrome was determined according to the recommendations from Harmonizing the Metabolic Syndrome. Its frequency was evaluated according to the demographic (sex, skin color, age and marital status), socioeconomic (educational level, income and work shift), and behavioral characteristics (smoking, alcohol intake, leisure time physical activity, number of meals and sleep duration) of the sample. The multivariate analysis followed a theoretical framework for identifying metabolic syndrome in fixed-shift workers. RESULTS The prevalence of metabolic syndrome in the sample was 9.3% (95%CI 7.4;11.2). The most frequently altered component was waist circumference (PR 48.4%; 95%CI 45.5;51.2), followed by high-density lipoprotein. Work shift was not associated with metabolic syndrome and its altered components. After adjustment, the prevalence of metabolic syndrome was positively associated with women (PR 2.16; 95%CI 1.28;3.64), workers aged over 40 years (PR 3.90; 95%CI 1.78;8.93) and those who reported sleeping five hours or less per day (PR 1.70; 95%CI 1.09;2.24). On the other hand, metabolic syndrome was inversely associated with educational level and having more than three meals per day (PR 0.43; 95%CI 0.26;0.73). CONCLUSIONS Being female, older and deprived of sleep are probable risk factors for metabolic syndrome, whereas higher educational level and higher number of meals per day are protective factors for metabolic syndrome in fixed-shift workers. PMID:26061455

  17. Mixed quantum/classical theory of rotationally and vibrationally inelastic scattering in space-fixed and body-fixed reference frames

    SciTech Connect

    Semenov, Alexander; Babikov, Dmitri

    2013-11-07

    We formulated the mixed quantum/classical theory for rotationally and vibrationally inelastic scattering process in the diatomic molecule + atom system. Two versions of theory are presented, first in the space-fixed and second in the body-fixed reference frame. First version is easy to derive and the resultant equations of motion are transparent, but the state-to-state transition matrix is complex-valued and dense. Such calculations may be computationally demanding for heavier molecules and/or higher temperatures, when the number of accessible channels becomes large. In contrast, the second version of theory requires some tedious derivations and the final equations of motion are rather complicated (not particularly intuitive). However, the state-to-state transitions are driven by real-valued sparse matrixes of much smaller size. Thus, this formulation is the method of choice from the computational point of view, while the space-fixed formulation can serve as a test of the body-fixed equations of motion, and the code. Rigorous numerical tests were carried out for a model system to ensure that all equations, matrixes, and computer codes in both formulations are correct.

  18. Fixed Or Controlled-Movement Foot Restraint

    NASA Technical Reports Server (NTRS)

    Reilly, Gloria B.; Blizzard, Noah

    1992-01-01

    Foot restraint gives user three options: holds user's feet in fixed position, allows them to slide sideways, or allows them to pivot independently about axis through ball of foot, as user chooses. Selects degree of restraint to suit task at hand. Movements to enter and leave foot restraint simple and direct. Simply forces each cleat lightly into space between rails until spring force of movable rail secures it. Body movements for sliding and rotation equally straightforward. Designed for use in absence of gravitation, restraint useful on Earth, underwater or in some hazardous locations where movements restricted.

  19. Trapping of Projectiles in Fixed Scatterer Calculations

    E-print Network

    S. Lenz; D. Stoll

    1994-07-01

    We study multiple scattering off nuclei in the closure approximation. Instead of reducing the dynamics to one particle potential scattering, the scattering amplitude for fixed target configurations is averaged over the target groundstate density via stochastic integration. At low energies a strong coupling limit is found which can not be obtained in a first order optical potential approximation. As its physical explanation, we propose it to be caused by trapping of the projectile. We analyse this phenomenon in mean field and random potential approximations. (PACS: 24.10.-i)

  20. Flattening fixed-angle chains is strongly NP-hard

    E-print Network

    Demaine, Erik D.

    Planar configurations of fixed-angle chains and trees are well studied in polymer science and molecular biology. We prove that it is strongly NP-hard to decide whether a polygonal chain with fixed edge lengths and angles ...