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1

Fixed-point pure gauge action using $ b= \\sqrt{3} $ RGT  

E-print Network

We present a status report on the construction of the classical perfect action using the $ b=\\sqrt{3} $ renormalization group transformation (RGT). We investigate finite volume corrections and map the locality of the fixed-point action by tuning the RGT parameter, $\\kappa$. We compare results with the previous calculation for b=2 RGT.

Tanmoy Bhattacharya; Rajan Gupta; Weonjong Lee

1999-10-29

2

Multiple Fixed-Point Cell  

NASA Astrophysics Data System (ADS)

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.

Edler, F.; Ederer, P.

2014-07-01

3

BROUWER'S FIXED POINT THEOREM JASPER DEANTONIO  

E-print Network

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

May, J. Peter

4

Fixed point theorems and dissipative processes.  

NASA Technical Reports Server (NTRS)

Operators of the type considered by Hale et al. (1972) are used to show that under certain conditions there is a fixed point in a dissipative map within a Banach space. The conditions required for the existence of this fixed point are discussed in detail. Several fixed point theorems are formulated and proved.

Hale, J. K.; Lopes, O.

1973-01-01

5

Fixed points of commutative Lüders operations  

E-print Network

This paper verifies a conjecture posed in a pair of papers on the fixed point sets for a class of quantum operations. Specifically, it is proved that if a quantum operation has mutually commuting operation elements that are effects forming a resolution of the identity, then the fixed points set of the quantum operation is exactly the commutant of the operation elements.

Liu Weihua; Wu Junde

2010-09-14

6

Fixed point theorems and dissipative processes  

NASA Technical Reports Server (NTRS)

The deficiencies of the theories that characterize the maximal compact invariant set of T as asymptotically stable, and that some iterate of T has a fixed point are discussed. It is shown that this fixed point condition is always satisfied for condensing and local dissipative T. Applications are given to a class of neutral functional differential equations.

Hale, J. K.; Lopes, O.

1972-01-01

7

HIGHER FIXED POINTS OF TOPOLOGICAL HOCHSCHILD HOMOLOGY  

E-print Network

HIGHER FIXED POINTS OF TOPOLOGICAL HOCHSCHILD HOMOLOGY OF THE INTEGERS AT TWO John Rognes Abstract. We inductively determine the mod two homotopy of the fixed point spaces T (Z)C2n for subgroups ([BM1]) computing the completed algebraic K-theory of the p-adic integers when p is an odd prime

8

HIGHER FIXED POINTS OF TOPOLOGICAL HOCHSCHILD HOMOLOGY  

E-print Network

HIGHER FIXED POINTS OF TOPOLOGICAL HOCHSCHILD HOMOLOGY OF THE INTEGERS AT TWO John Rognes Abstract. We inductively determine the mod two homotopy of the fixed point spaces T (Z) C 2 n for subgroups ([BM1]) computing the completed algebraic K­theory of the p­adic integers when p is an odd prime

9

FIXED POINT THEORY OF MULTIVALUED WEIGHTED MAPS  

E-print Network

weighted carriers look similar to other cat- egories of acyclic maps for which a fixed point theory has.SKIBA In this paper (except when strictly necessary) we will omit any fur- ther reference to other classes

Ceragioli, Francesca

10

On Fixed Point Equations over Commutative Semirings  

Microsoft Academic Search

Fixed point equations x = f(x) over !-continuous semirings can be seen as the mathematical foundation of interprocedural program analysis. The sequence 0; f(0); f 2(0); : : : converges to the least xed point f. The convergence can be accelerated if the underlying semiring is com- mutative. We show that accelerations in the literature, namely Newton's method for the

Javier Esparza; Stefan Kiefer; Michael Luttenberger

2007-01-01

11

ASIC For Complex Fixed-Point Arithmetic  

NASA Technical Reports Server (NTRS)

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.

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

1995-01-01

12

Fixed Point Theorems for Hybrid Mappings  

PubMed Central

We obtain some fixed point theorems for two pairs of hybrid mappings using hybrid tangential property and quadratic type contractive condition. Our results generalize some results by Babu and Alemayehu and those contained therein. In the sequel, we introduce a new notion to generalize occasionally weak compatibility. Moreover, two concrete examples are established to illuminate the generality of our results.

Kamran, Tayyab; Karapinar, Erdal

2015-01-01

13

The Geometry of Fixed Point Varieties on Affine Flag Manifolds  

Microsoft Academic Search

Let $G$ be a semisimple, simply connected, algebraic group over an\\u000aalgebraically closed field $k$ with Lie algebra $\\\\frak g$. We study the spaces\\u000aof parahoric subalgebras of a given type containing a fixed nil-elliptic\\u000aelement of $\\\\frak g\\\\otimes k((\\\\pi))$, i.e. fixed point varieties on affine flag\\u000amanifolds. We define a natural class of $k^*$-actions on affine flag manifolds,\\u000ageneralizing

Daniel S. Sage

1999-01-01

14

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

Code of Federal Regulations, 2010 CFR

...private operational fixed point-to-point microwave stations. 101.137 Section 101...SAFETY AND SPECIAL RADIO SERVICES FIXED MICROWAVE SERVICES Technical Standards § 101...private operational fixed point-to-point microwave stations. Private operational...

2010-10-01

15

New SMU Gallium Fixed-Point Cells  

NASA Astrophysics Data System (ADS)

In the framework of the European research project EURAMET 732, the Slovak Institute of Metrology (SMU) built three primary gallium fixed-point cells of different designs. The cells are designed for the calibration of the long-stem SPRT. In regard to the procedure commonly used at SMU when realizing the gallium point, the cells are designed for use in a stirred liquid bath. This article provides information about the cell designs, materials used, method of filling, and results of the performed experiments. The experiments were focused on the study of the cells' metrological characteristics, some effects that could influence the melting-point temperature and the effect of the melted metal fraction on the immersion profile. New cells were compared with the SMU reference gallium cell.

Ranostaj, Juraj; ?uriš, Stanislav; Knorová, Renáta; Kaskötö, Mariana; Vysko?ilová, Irena

2011-08-01

16

On Fixed Points of Lüders Operation  

E-print Network

In this paper, we prove that if $\\mathcal{A}=\\{E_i\\}_{i=1}^{n}$ is a finite commutative quantum measurement, then the fixed points set of L\\"{u}ders operation $L_{{\\cal A}}$ is the commutant ${\\cal A}'$ of ${\\cal A}$, the result answers an open problem partially. We also give a concrete example of a L\\"{u}ders operation $L_{{\\cal A}}$ with $n=3$ such that $L_{{\\cal A}}(B)=B$ does not imply that the quantum effect $B$ commutes with all $E_1, E_2$ and $E_3$, this example answers another open problem.

Liu Weihua; Wu Junde

2009-09-08

17

Holographic non-Fermi-liquid fixed points.  

PubMed

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

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

2011-04-28

18

Math 512: Finite Model Theory Fixed Point logics  

E-print Network

closure, subgroup generated by (an operator can have more th* *an one fixed point), `even' or `odd Math 512: Finite Model Theory Fixed Point(X) = F i(X). F i(X) is the* * least fixed point of F . There are several choices for exactly

Baldwin, John T.

19

A fixed point theorem for the infinite-dimensional simplex  

NASA Astrophysics Data System (ADS)

We define the infinite-dimensional simplex to be the closure of the convex hull of the standard basis vectors in , and prove that this space has the fixed point property: any continuous function from the space into itself has a fixed point. Our proof is constructive, in the sense that it can be used to find an approximate fixed point; the proof relies on elementary analysis and Sperner's lemma. The fixed point theorem is shown to imply Schauder's fixed point theorem on infinite-dimensional compact convex subsets of normed spaces.

Rizzolo, Douglas; Su, Francis Edward

2007-08-01

20

brouwer fixed point theorem the sign pattern theorem  

E-print Network

brouwer fixed point theorem the sign pattern theorem algebraic topology statement of the theorem making it plausible taming the topology Theorem (L. E. J. Brouwer, 1910) Let Bn be the n-dimensional unit. Tibor Beke the sign pattern theorem #12;brouwer fixed point theorem the sign pattern theorem algebraic

Beke, Tibor

21

Fixed points for weakly inward mappings in Banach spaces  

NASA Astrophysics Data System (ADS)

S. Hu and Y. Sun [S. Hu, Y. Sun, Fixed point index for weakly inward mappings, J. Math. Anal. Appl. 172 (1993) 266-273] defined the fixed point index for weakly inward mappings, investigated its properties and studied the fixed points for such mappings. In this paper, following S. Hu and Y. Sun, we continue to investigate boundary conditions, under which the fixed point index for the completely continuous and weakly inward mapping, denoted by i(A,[Omega],P), is equal to 1 or 0. Correspondingly, we can obtain some new fixed point theorems of the completely continuous and weakly inward mappings and existence theorems of solutions for the equations Ax=[mu]x, which extend many famous theorems such as Leray-Schauder's theorem, Rothe's two theorems, Krasnoselskii's theorem, Altman's theorem, Petryshyn's theorem, etc., to the case of weakly inward mappings. In addition, our conclusions and methods are different from the ones in many recent works.

Xu, Shaoyuan; Jia, Baoguo; Li, Guo-Zhen

2006-07-01

22

A new compact fixed-point blackbody furnace  

SciTech Connect

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.

Hiraka, K.; Oikawa, H.; Shimizu, T.; Kadoya, S.; Kobayashi, T. [CHINO CORPORATION, Itabashi, Tokyo (Japan)] [CHINO CORPORATION, Itabashi, Tokyo (Japan); Yamada, Y.; Ishii, J. [National Metrology Institute of Japan, AIST, Tsukuba, Ibaraki (Japan)] [National Metrology Institute of Japan, AIST, Tsukuba, Ibaraki (Japan)

2013-09-11

23

KAM-tori near an analytic elliptic fixed point  

NASA Astrophysics Data System (ADS)

We study the accumulation of an elliptic fixed point of a real analytic Hamiltonian by quasi-periodic invariant tori. We show that a fixed point with Diophantine frequency vector ? 0 is always accumulated by invariant complex analytic KAM-tori. Indeed, the following alternative holds: If the Birkhoff normal form of the Hamiltonian at the invariant point satisfies a Rüssmann transversality condition, the fixed point is accumulated by real analytic KAM-tori which cover positive Lebesgue measure in the phase space (in this part it suffices to assume that ? 0 has rationally independent coordinates). If the Birkhoff normal form is degenerate, there exists an analytic subvariety of complex dimension at least d + 1 passing through 0 that is foliated by complex analytic KAM-tori with frequency ? 0. This is an extension of previous results obtained in [1] to the case of an elliptic fixed point.

Eliasson, L. Hakan; Fayad, Bassam; Krikorian, Raphaël

2013-11-01

24

A fixed point theorem for contractions in modular metric spaces  

E-print Network

The notion of a (metric) modular on an arbitrary set and the corresponding modular space, more general than a metric space, were introduced and studied recently by the author [V. V. Chistyakov, Metric modulars and their application, Dokl. Math. 73(1) (2006) 32-35, and Modular metric spaces, I: Basic concepts, Nonlinear Anal. 72(1) (2010) 1-14]. In this paper we establish a fixed point theorem for contractive maps in modular spaces. It is related to contracting rather ``generalized average velocities'' than metric distances, and the successive approximations of fixed points converge to the fixed points in a weaker sense as compared to the metric convergence.

Chistyakov, Vyacheslav V

2011-01-01

25

Optimal measurements and fixed-point maps  

NASA Astrophysics Data System (ADS)

When an optimal measurement of (Sx,Sy,Sz) is made on a qubit and what we call a mutually unbiased mixture of the resulting ensembles is taken, then the post-measurement density matrix is shown to be related to the premeasurement density matrix through a simple linear relation. It is also shown that the form of this relation is the same for all quantum systems. It is shown that for a general quantum system such a relation holds only when the measurements are made in mutually unbiased bases. The post-measurement density matrix is shown to be a normalized incoherent superposition of the identity map and the pin map of Gorini and Sudarshan. A pin map is one which maps all density matrices to a fixed density matrix which in our case turns out to be the unit matrix. The result is shown to be true irrespective of whether the initial state is pure or mixed. For spin- 1/2 systems it is also shown explicitly that nonorthogonal measurements fail to give such a linear relation no matter how the ensembles are mixed.

Dhara, Chirag; Hari Dass, N. D.

2005-08-01

26

Infra-red fixed points at the boundary  

E-print Network

Gauged supergravities (in four and five dimensions) with eight supercharges and with vector supermultiplets have a unique ultra-violet (UV) fixed point on a given physical domain \\cal M of the space of the scalar fields. We show that in these models the infra-red (IR) fixed points are located on the boundary of \\cal M, where the space-time metric becomes singular.

Klaus Behrndt; Mirjam Cvetic

2000-02-07

27

Image Integrity Authentication Scheme Based On Fixed Point Theory.  

PubMed

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 send 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 locate the tampered areas if the image has been modified during the transmission. A realization of the new scheme is based on a Gaussian Convolution and Deconvolution (GCD) transform, for which an existence theorem of fixed points is proved. The semi-fragility 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 few numbers of iterations, and for the whole procedure of image integrity authentication; a fragile authentication system and a semi-fragile one are separately built. Experiments show that both systems have good performance in transparence, fragility, security and tampering localization. In particular, the semi-fragile system can perfectly resist the rotation by a multiple of 90o, flipping and brightness attacks. PMID:25420259

Li, Xu; Sun, Xingming; Liu, Quansheng

2014-11-20

28

Further Findings of Impurity Precipitation in Metal Fixed Points  

NASA Astrophysics Data System (ADS)

Impurities are believed to be one of the major issues in realizing the metal fixed-point temperatures of the ITS-90 with a low degree of uncertainty. This has raised interest in the individual effects of impurities on the phase-transition temperature of fixed-point metals. Surprisingly, impurities that do not affect a fixed-point temperature have been found experimentally. A possible explanation for this behavior is the formation of insoluble oxides of the added impurities consuming oxygen already present in the fixed-point cell (mostly as an oxide of the fixed-point metal). This is supported by several recent publications. However, all the results could be coincidental. This article presents more convincing proof for the formation of insoluble compounds born from impurities dissolved in the fixed-point metal. Based on refined doping experiments and using impurities that have not been investigated before, both the impurities' dissolution and the precipitation could be observed as an initial decrease (or increase) of the fixed-point temperature followed by a gradual return to its original value. The selected impurities (gallium and zinc in indium) were found to dissolve within a few days and precipitate out within no more than two weeks. The behavior of iron in indium was investigated as well, but the results are not conclusive. Finally, another series of doping experiments indicates that sulfur does not dissolve in indium in significant amounts, but forms insoluble compounds (probably sulfides) when added to the metal. This supports the general assumption that metal-non-metal compounds might be present in the cell without being noticed.

Fahr, M.; Rudtsch, S.; Aulich, A.

2011-12-01

29

Stray thermal influences in zinc fixed-point cells  

SciTech Connect

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.

Rudtsch, S.; Aulich, A.; Monte, C. [Physikalisch-Technische Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin (Germany)] [Physikalisch-Technische Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin (Germany)

2013-09-11

30

Fully Local and E cient Evaluation of Alternating Fixed Points?  

E-print Network

Fully Local and E cient Evaluation of Alternating Fixed Points? Extended Abstract Xinxin Liu, C. R. Ramakrishnan, and Scott A. Smolka Department of Computer Science State University of New York at Stony Brook modal mu-calculus. Our main result is an e cient local algorithm for evaluating PDG xed points. Our

Ramakrishnan, C. R.

31

Coupled Potts models: Self-duality and fixed point structure  

NASA Astrophysics Data System (ADS)

We consider q-state Potts models coupled by their energy operators. Restricting our study to self-dual couplings, numerical simulations demonstrate the existence of non-trivial fixed points for 2 ? q ? 4. These fixed points were first predicted by perturbative renormalisation group calculations. Accurate values for the central charge and the multiscaling exponents of the spin and energy operators are calculated using a series of novel transfer matrix algorithms employing clusters and loops. These results compare well with those of the perturbative expansion, in the range of parameter values where the latter is valid. The criticality of the fixed-point models is independently verified by examining higher eigenvalues in the even sector, and by demonstrating the existence of scaling laws from Monte Carlo simulations. This might be a first step towards the identification of the conformal field theories describing the critical behaviour of this class of models.

Dotsenko, Vladimir; Jacobsen, Jesper Lykke; Lewis, Marc-André; Picco, Marco

1999-05-01

32

Positive area and inaccessible fixed points for hedgehogs  

E-print Network

Let f be a germ of holomorphic diffeomorphism with an irra- tionally indifferent fixed point at the origin in C (i.e. f(0) = 0, f'(0) = e 2pi i alpha, alpha in R - Q). Perez-Marco showed the existence of a unique family of nontrivial invariant full continua containing the fixed point called Siegel compacta. When f is non-linearizable (i.e. not holomorphically conjugate to the rigid rotation R_{alpha}(z) = e 2pi i z) the invariant compacts obtained are called hedgehogs. Perez-Marco developed techniques for the construction of examples of non-linearizable germs; these were used by the author to construct hedge- hogs of Hausdorff dimension one, and adapted by Cheritat to construct Siegel disks with pseudo-circle boundaries. We use these techniques to construct hedgehogs of positive area and hedgehogs with inaccessible fixed points.

Biswas, Kingshook

2010-01-01

33

Measurement of thermodynamic temperature of high temperature fixed points  

SciTech Connect

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.

Gavrilov, V. R.; Khlevnoy, B. B.; Otryaskin, D. A.; Grigorieva, I. A.; Samoylov, M. L.; Sapritsky, V. I. [All-Russian Research Institute for Optical and Physical Measurements (VNIIOFI), 46 Ozernaya St., Moscow 119361 (Russian Federation)] [All-Russian Research Institute for Optical and Physical Measurements (VNIIOFI), 46 Ozernaya St., Moscow 119361 (Russian Federation)

2013-09-11

34

On R-symmetric Fixed Points and Superconformality  

SciTech Connect

An important unanswered question in quantum field theory is to understand precisely under which conditions scale invariance implies invariance under the full conformal group. While the general answer in two dimensions has been known for over 20 years, a precise nonperturbative relation between scale and conformal invariance in higher dimensions has been lacking. In this note, we specialize to four dimensions and give a full quantum mechanical proof that certain unitary R-symmetric fixed points are necessarily superconformal. Among other consequences, this result implies that the infrared fixed points of N=1 supersymmetric quantum chromodynamics are superconformal.

Antoniadis, Ignatios; Buican, Matthew [Department of Physics, CERN Theory Division, CH-1211 Geneva 23 (Switzerland)

2011-05-15

35

An order theoretic approach in fixed point theory  

E-print Network

In the present article, we show the existence of a coupled fixed point for an order preserving mapping in a preordered left K-complete quasi-pseudometric space using a preorder induced by an appropriate function. We also define the concept of left-weakly related mappings on a preordered space and discuss common coupled fixed points for two and three left-weakly related mappings in the same space. Similar results are given for right-weakly related mappings, the dual notion of left-weakly related mappings.

Yaé Ulrich Gaba

2014-11-07

36

Cobalt-Carbon Eutectic Fixed Point for Contact Thermometry  

NASA Astrophysics Data System (ADS)

Two Co-C eutectic fixed points were constructed for thermocouple calibration. The eutectic fixed points were measured with a Pt/Pd thermocouple calibrated at the freezing temperatures of Sn, Zn, Al, Ag, and Au. A temperature of (1323.99 ± 0.52) °C ( k = 2) was determined via this method. The cell design allowed filling to be accomplished in a single step. Each cell was held above 1300 °C for at least 42 h and was subjected to at least 20 melt/freeze cycles with no mechanical failure occurring.

Todd, A. D. W.; Gotoh, M.; Woods, D. J.; Hill, K. D.

2011-01-01

37

Fixed Point Theorems with Applications to Economics and Game Theory  

Microsoft Academic Search

One of the problems in economics that economists have devoted a considerable amount of attention in prevalent years has been to ensure consistency in the models they employ. Assuming markets to be generally in some state of equilibrium, it is asked under what circumstances such equilibrium is possible. The fundamental mathematical tools used to address this concern are fixed point

Kim C. Border

1985-01-01

38

Fixed Points of Difference Operator of Meromorphic Functions  

PubMed Central

Let f be a transcendental meromorphic function of order less than one. The authors prove that the exact difference ?f =(z+1) - f (z) has infinitely many fixed points, if a ? ? and ? are Borel exceptional values (or Nevanlinna deficiency values) of f. These results extend the related results obtained by Chen and Shon. PMID:24563624

Wu, Zhaojun; Xu, Hongyan

2014-01-01

39

Fixed points of dictionary learning algorithms for sparse representations  

E-print Network

of Sparsenet followed by K-SVD provides a significant improvement in terms of exact recovery rate and approximation quality. Index Terms--Machine learning algorithms, Dictionar- ies, Optimization, Sparse coding I1 Fixed points of dictionary learning algorithms for sparse representations Boris Mailhé, Member

Boyer, Edmond

40

Improved Fixed Point Methods for Loss Networks with Linear Structure  

E-print Network

­ ods have had only limited success. Under several regimes the Erlang Fixed Point (EFP) method provides of traf­ fic, our method produced relative errors typically 10 \\Gamma5 of that found using the EFP alternative methods, and, ar­ guably the most important of these is the EFP approximation. 2. THE EFP

Pollett, Phil

41

Kadanoff Sand Pile Model Avalanches and Fixed Points  

E-print Network

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

Liège, Université de

42

Gravity Duals of Lifshitz-Like Fixed Points  

SciTech Connect

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.

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

2008-11-05

43

On String Theory Duals of Lifshitz-like Fixed Points  

E-print Network

We present type IIB supergravity solutions which are expected to be dual to certain Lifshitz-like fixed points with anisotropic scale invariance. They are expected to describe a class of D3-D7 systems and their finite temperature generalizations are straightforward. We show that there exist solutions that interpolate between these anisotropic solutions in the IR and the standard AdS5 solutions in the UV. This predicts anisotropic RG flows from familiar isotropic fixed points to anisotropic ones. In our case, these RG flows are triggered by a non-zero theta-angle in Yang-Mills theories that linearly depends on one of the spatial coordinates. We study the perturbations around these backgrounds and discuss the possibility of instability. We also holographically compute their thermal entropies, viscosities, and entanglement entropies.

Tatsuo Azeyanagi; Wei Li; Tadashi Takayanagi

2009-05-06

44

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

DOE PAGESBeta

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.

Deremble, Bruno; D'Andrea, Fabio; Ghil, Michael [Univ. of California, Los Angeles, CA (United Staes). Atmospheric and Oceanic Sciences and Institute of Geophysics and Planetary Physics

2009-10-27

45

Fixed point structure of quenched, planar quantum electrodynamics  

SciTech Connect

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.

Love, S.T.

1986-07-01

46

Approximately J?-homomorphisms: A fixed point approach  

NASA Astrophysics Data System (ADS)

The functional equation (?) is stable if any function g satisfying the equation (?)approximately is near to the true solution of (?). A functional equation is superstable if every solution satisfying the equation approximately is an exact solution of it. Using fixed point methods, we prove the stability and superstability of J?-homomorphisms between J?-algebras for the generalized Jensen-type functional equation f({x+y}/{2})+f({x-y}/{2})=f(x).

Eshaghi Gordji, M.; Najati, A.

2010-05-01

47

A fixed point approach to stability of a quadratic equation  

Microsoft Academic Search

.  Using the fixed point alternative theorem we establish the orthogonal stability of the quadratic functional equation of Pexider\\u000a type f (x+y)+g(x?y) = h(x)+k(y), where f, g, h, k are mappings from a symmetric orthogonality space to a Banach space, by orthogonal additive mappings under a necessary and\\u000a sufficient condition on f.

M. Mirzavaziri; M. S. Moslehian

2006-01-01

48

d self-avoiding path (canonical surface) (fixed point)  

E-print Network

d self-avoiding path 2004 2 1 1 path (canonical surface) (fixed point) canonical surface [1, ] self-avoiding path Self-avoiding path d pre-gasket self-avoiding path d pre-gasket Sierpi´nski gasket d pre-gasket self-avoiding path 1 E-mail: hattori@math.nagoya-u.ac.jp 1 #12;d pre-gasket d pre-gasket 1 2 self

Hattori, Tetsuya

49

Fixed Point Data Type Modeling for High Level Synthesis  

NASA Astrophysics Data System (ADS)

A methodology to automatically convert fixed point data type representations into integer data types for high level synthesis is presented in this work. Our method converts all major C operations using fixed point data types into integer data types, models quantization and overflow modes, type conversion and casting. The conversion rule for each operation is described in detail as well as a regression test environment with 600 test cases to validate the method and to verify the correctness of each conversion compared to the same cases written in SystemC. The test environment converts each test case with fixed point data types into integer data types and synthesizes them with a high level synthesis tool to generate RTL. An RTL simulation is ran and the results in turn compared to the SystemC's OSCI simulation. For all of the 600 test cases the RTL simulation results matched the SystemC results proving that each conversion is accurately modeled. A larger real test case is also presented to validate the conversion method in a complex case.

Carrion Schafer, Benjamin; Iguchi, Yusuke; Takahashi, Wataru; Nagatani, Shingo; Wakabayashi, Kazutoshi

50

Chiral measurements with the Fixed-Point Dirac operator and construction of chiral currents  

NASA Astrophysics Data System (ADS)

In this preliminary study, we examine the chiral properties of the parametrized Fixed-Point Dirac operator DFP, see how to improve its chirality via the Overlap construction, measure the renormalized quark condensate and the topological susceptibility ?t, and investigate local chirality of near zero modes of the Dirac operator. We also give a general construction of chiral currents and densities for chiral lattice actions.

Hasenfratz, P.; Hauswirth, S.; Holland, K.; Jörg, T.; Niedermayer, F.

51

Quantization and fixed points of non-integrable Weyl theory  

NASA Astrophysics Data System (ADS)

We consider a simple but generic model of gravity where Weyl invariance is realized thanks to the presence of a gauge field for dilatations. We quantize the theory by suitably defining renormalization group flows that describe the integration of successive momentum shells, in such a way that Weyl invariance is maintained in the flow. When the gauge fields are massless the theory has, in addition to Weyl invariance, an abelian gauge symmetry. According to the definition of the cutoff, the flow can break or preserve this extended symmetry. We discuss the fixed points of these flows.

Pagani, C.; Percacci, R.

2014-06-01

52

24 CFR 50.16 - Decision points for policy actions.  

Code of Federal Regulations, 2010 CFR

...2010-04-01 false Decision points for policy actions. 50.16 Section 50.16 ...ENHANCEMENT OF ENVIRONMENTAL QUALITY General Policy: Decision Points § 50.16 Decision points for policy actions. Either an EA and FONSI or...

2010-04-01

53

Fixed point of second virial coefficients in the glass transition  

E-print Network

Classical thermodynamic theory still holds true in subsystem that is a percolation connected by 8 orders of self-similar 2-body-3-body coupling clusters. The fixed point, $B_2^* \\equiv 3/8$, for the clusters of different size, existing in reduced second Virial coefficients has been proved by scaling theory in percolation field. It is shown that, if $B_2^* \\equiv 3/8$ is combined with $B_3^* \\equiv 5/8$, the potentials of 2-body-3-body coupling clusters, in critical local cluster growth phase transition, balance the kinetic energy in the glass transition. It is also proved that the glass transition corresponds to the regime in which the chemical potentials in all subsystems hold zero.

Jialin Wu

2007-01-16

54

A Lefschetz fixed point theorem in gravitational lensing  

E-print Network

Topological invariants play an important r\\^{o}le in the theory of gravitational lensing by constraining the image number. Furthermore, it is known that, for certain lens models, the image magnifications $\\mu_i$ obey invariants of the form $\\sum_i \\mu_i=1$. In this paper, we show that this magnification invariant is the holomorphic Lefschetz number of a suitably defined complexified lensing map, and hence a topological invariant. We also provide a heat kernel proof of the holomorphic Lefschetz fixed point formula which is central to this argument, based on Kotake's proof of the more general Atiyah-Bott theorem. Finally, we present a new astronomically motivated lens model for which this invariant holds.

Marcus C. Werner

2007-05-17

55

Fixed point structure of supersymmetric O(N) theories Tobias Hellwig  

E-print Network

Fixed point structure of supersymmetric O(N) theories Tobias Hellwig FS University Jena PAF TPI 24.09.2012 Tobias Hellwig (TPI FSU Jena) Fixed point of O(N) theories 24.09.2012 1 / 19 #12;Table of contents 1 Corrections given by nite N analysis Spontaneously broken phase Tobias Hellwig (TPI FSU Jena) Fixed point of O

Rossak, Wilhelm R.

56

Alternating Fixed Point Logic Programs Witold Charatonik \\Lambday David McAllester z Damian Niwinski x--  

E-print Network

as a nesting of least and greatest fixed points --- predicates of odd priority can be interpreted as havingAlternating Fixed Point Logic Programs Witold Charatonik \\Lambday David McAllester z Damian Niwiâ??nski x-- Andreas Podelski \\Lambda Igor Walukiewicz \\Sigma May 8, 1998 Abstract An alternating fixed point

McAllester, David

57

String unification, spaghetti diagrams and infra-red fixed points  

NASA Astrophysics Data System (ADS)

The minimal supersymmetric standard model (MSSM), is perhaps the leading candidate for new physics beyond the standard model, but it encounters difficulties with string gauge unification nd in addition does not shed any light on the question of fermion masses. We consider a scenario in which the 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 o 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.

Allanach, B. C.; King, S. F.

1997-02-01

58

A note about the relation between fixed point theory on cone metric spaces and fixed point theory on metric spaces  

E-print Network

Let Y be a locally convex Hausdorff space, K \\subset E a cone and \\leq_K the partial order defined by K. Let (X, p) be a TV S- cone metric space, {\\phi} : K \\rightarrow K a vectorial comparison function and f : X \\rightarrow X such that p(f(x), f(y)) \\leq_K {\\phi}(p(x, y)), for all x, y \\in X. We shall show that there exists a scalar comparison function {\\psi} : R+ \\rightarrow R+ and a metric d_p(in usual sense) on X such that d_p(f(x), f(y)) \\leq {\\psi}(d_p(x, y)), for all x, y \\in X. Our results extend the results of Du (2010) [Wei-Shih Du, A note on cone metric fixed point theory and its equivalence, Nonlinear Anal. 72 (2010), 2259-2261].

Olaru, Ion

2011-01-01

59

Non-Gaussian fixed points in fermionic field theories without auxiliary Bose fields  

NASA Astrophysics Data System (ADS)

The functional equation governing the renormalization flow of fermionic field theories is investigated in dimensions without introducing auxiliary Bose fields on the example of the Gross-Neveu and the Nambu-Jona-Lasinio model. The UV-safe fixed points and the eigenvectors of the renormalization group equations linearized around them are found in the local potential approximation. The results are compared carefully with those obtained with partial bosonization. The results do not receive any correction in the next-to-leading order approximation of the gradient expansion of the effective action.

Jakovác, A.; Patkós, A.; Pósfay, P.

2015-01-01

60

Fixed-Point Optimization Utility for C and C Based Digital Signal Processing Programs  

Microsoft Academic Search

Fixed-point optimization utility software is devel- oped that can aid scaling and wordlength determination of digital signal processing algorithms written in C or C. This utility consists of two programs: the range estimator and the fixed-point simulator . The former estimates the ranges of floating- point variables for purposes of automatic scaling, and the latter translates floating-point programs into fixed-point

Seehyun Kim; Ki-Il Kum; Wonyong Sung

1998-01-01

61

Gauge invariant and gauge fixed actions for various higher-spin fields from string field theory  

NASA Astrophysics Data System (ADS)

We propose a systematic procedure for extracting gauge invariant and gauge fixed actions for various higher-spin gauge field theories from covariant bosonic open string field theory. By identifying minimal gauge invariant part for the original free string field theory action, we explicitly construct a class of covariantly gauge fixed actions with BRST and anti-BRST invariance. By expanding the actions with respect to the level N of string states, the actions for various massive fields including higher-spin fields are systematically obtained. As illustrating examples, we explicitly investigate the level N?3 part and obtain the consistent actions for massive graviton field, massive 3rd rank symmetric tensor field, or anti-symmetric field. We also investigate the tensionless limit of the actions and explicitly derive the gauge invariant and gauge fixed actions for general rank n symmetric and anti-symmetric tensor fields.

Asano, Masako

2013-03-01

62

Lecture 6: Fixed Points and elements of Domain theory Consider recursive definition of gcd  

E-print Network

#18; g implies F(f) #18; F(g). 2. F is continuous if F is monotone and for every f; a: F(f)(a) depends n is the least fixed point of F. f n #18; F(f) by monotonicity. Hence f #18; F(f) f #19; F(f) by continuity of F Hence f is a fixed point. If h is a fixed point of F then f n #18; h and hence f #18; h

Rabinovich, Alexander

63

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

E-print Network

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.

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

2006-09-20

64

Fixed point spaces in actions of classical algebraic groups  

Microsoft Academic Search

Let G be a simple classical algebraic group over an algebraically closed field K of characteristic pd 0, and let H be a maximal closed non-subspace subgroup of G. Given such a pair ðG; HÞ, we obtain a close to best possible upper bound for the ratio dimðx G V HÞ=dim x G, where x A G is a semisimple

Timothy C. Burness

2004-01-01

65

of the Markov-Kakutani fixed point theorem via the Hahn-Banach theorem  

E-print Network

A proof of the Markov-Kakutani fixed point theorem via the Hahn-Banach theorem Dirk Werner S. Kakutani, in [2] and [3], provides a proof of the Hahn-Banach theorem via the Markov-Kakutani fixed point theorem, which reads as follows. Theorem Let K be a compact convex set in a locally convex Hausdorff space

Werner, Dirk

66

ANDERSON ACCELERATION FOR FIXED-POINT ITERATIONS HOMER F. WALKER AND PENG NI  

E-print Network

ANDERSON ACCELERATION FOR FIXED-POINT ITERATIONS HOMER F. WALKER AND PENG NI Abstract. This paper concerns an acceleration method for fixed-point iterations that originated in work of D. G. Anderson-560], which we accordingly call Anderson acceleration here. This method has enjoyed considerable success

Walker, Homer F.

67

Stability of fixed points and generalized critical behavior in multifield models  

NASA Astrophysics Data System (ADS)

We study models with three coupled vector fields characterized by O (N1) ?O (N2) ?O (N3) symmetry. Using the nonperturbative functional renormalization group, we derive ? functions for the couplings and anomalous dimensions in d dimensions. Specializing to the case of three dimensions, we explore interacting fixed points that generalize the O (N ) Wilson-Fisher fixed point. We find a symmetry-enhanced isotropic fixed point, a large class of fixed points with partial symmetry enhancement, as well as partially and fully decoupled fixed-point solutions. We discuss their stability properties for all values of N1,N2, and N3, emphasizing important differences to the related two-field models. For small numbers of field components, we find no stable fixed-point solutions, and we argue that this can be attributed to the presence of a large class of possible (mixed) couplings in the three-field and multifield models. Furthermore, we contrast different mechanisms for stability interchange between fixed points in the case of the two- and three-field models, which generically proceed through fixed-point collisions.

Eichhorn, A.; Mesterházy, D.; Scherer, M. Â. M.

2014-11-01

68

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

69

The resolution of field identification fixed points in diagonal coset theories  

Microsoft Academic Search

The fixed point resolution problem is solved for diagonal coset theories. The primary fields into which the fixed points are resolved are described by submodules of the branching spaces, obtained as eigenspaces of the automorphisms that implement field identification. To compute the characters and the modular S-matrix we use ‘orbit Lie algebras’ and ‘twining characters’, which were introduced in a

Jürgen Fuchs; Bert Schellekens; Christoph Schweigert

1996-01-01

70

A Direct Geometric Proof of the Lefschetz Fixed Point Formulas  

E-print Network

be a C 1 , compact, connected, and oriented Riemannian manifold, of even dimension 2n, with a fixed Spin irreducibly on each of S+ and S \\Gamma , which are Clifford modules of dimension 2 n\\Gamma1 . If fe i g denotes the set of generators for the Clifford algebra C 2n = End(S+ \\Phi S \\Gamma ) then i n e 1 e 2

Lafferty, John

71

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

SciTech Connect

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.

Pavese, F.; McConville, G.T.

1986-01-01

72

Stability analysis of multiple nonequilibrium fixed points in self-consistent electron transport calculations  

NASA Astrophysics Data System (ADS)

We present a method to perform stability analysis of nonequilibrium fixed points appearing in self-consistent electron transport calculations. The nonequilibrium fixed points are given by the self-consistent solution of stationary, nonlinear kinetic equation for single-particle density matrix. We obtain the stability matrix by linearizing the kinetic equation around the fixed points and analyze the real part of its spectrum to assess the asymptotic time behavior of the fixed points. We derive expressions for the stability matrices within Hartree-Fock and linear response adiabatic time-dependent density functional theory. The stability analysis of multiple fixed points is performed within the nonequilibrium Hartree-Fock approximation for the electron transport through a molecule with a spin-degenerate single level with local Coulomb interaction.

Dzhioev, Alan A.; Kosov, D. S.

2011-11-01

73

Perceiving depth in point-light actions  

Microsoft Academic Search

The present study investigates how observers assign depth in point-light figures, by manipulating spatiotemporal characteristics\\u000a of the stimuli. Previous research on the perception of point-light walkers revealed bistability (i.e., that a point-light\\u000a walker is perceived as either facing the viewer or facing away from the viewer) and the presence of a perceptual bias (i.e.,\\u000a a tendency to perceive the figure

Jan Vanrie; Karl Verfaillie

2006-01-01

74

A New Co-C Eutectic Fixed-Point Cell for Thermocouple Calibration at  

NASA Astrophysics Data System (ADS)

The eutectic Co-C is a promising system to serve as a thermometric fixed point beyond the freezing point of copper (). Some national metrology institutes have developed, characterized, and compared their Co-C fixed-point cells based on conventional designs. Indeed, the fixed-point cells constructed are directly inspired by the technologies applied to the fixed points of the ITS-90 to the lower levels of temperature. By studying the eutectic metal-carbon systems, is appears that the high temperatures of implementation give a set of difficulties, such as the strong mechanical stresses on the graphite crucibles, due to the important thermal expansion of the eutectic alloys during their phase transitions. If these devices are suitable with research activities to serve like primary standards, it is not envisaged to propose them for a direct application to the calibration activities for the industry. As regards the limited robustness of the conventional fixed-point cells constructed, an intensive use of these device would not be reasonable, in term of cost for example. In this paper, a new Co-C fixed-point design is introduced. This low cost device has been developed specifically for intensive use in thermocouple calibration activities, with the aim of achieving the lowest level of uncertainties as is practicable. Thus, in this paper, the metrological characterization of this device is also presented, and a direct comparison to a primary Co-C fixed-point cell previously constructed is discussed.

Failleau, G.; Deuzé, T.; Jouin, D.; Mokdad, S.; Briaudeau, S.; Sadli, M.

2014-07-01

75

A fixed point theorem for certain operator valued maps  

NASA Technical Reports Server (NTRS)

In this paper, we develop a family of Neuberger-like results to find points z epsilon H satisfying L(z)z = z and P(z) = z. This family includes Neuberger's theorem and has the additional property that most of the sequences q sub n converge to idempotent elements of B sub 1(H).

Brown, D. R.; Omalley, M. J.

1978-01-01

76

The Fixed Point Property in Synthetic Domain Theory  

Microsoft Academic Search

We present an elementary axiomatisation of synthetic domain theory and show that it is sucient to deduce the xed point property and solve domain equations. Models of these axioms based on partial equivalence relations have received much attention, but there are also very simple sheaf models based on classical domain theory. In any case the aim of this paper is

Paul Taylor

1991-01-01

77

Computable counter-examples to the Brouwer fixed-point theorem  

E-print Network

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.

Petrus H. Potgieter

2008-04-21

78

Properties of the twisted Polyakov loop coupling and the infrared fixed point in the SU(3) gauge theories  

NASA Astrophysics Data System (ADS)

We report the nonperturbative behavior of the twisted Polyakov loop (TPL) coupling constant for the SU(3) gauge theories defined by the ratio of Polyakov loop correlators in finite volume with twisted boundary condition. We reveal the vacuum structures and the phase structure for the lattice gauge theory with the twisted boundary condition. Carrying out the numerical simulations, we determine the nonperturbative running coupling constant in this renormalization scheme for the quenched QCD and N_f=12 SU(3) gauge theories. First, we study the quenched QCD theory using the plaquette gauge action. The TPL coupling constant has a fake fixed point in the confinement phase. We discuss this fake fixed point of the TPL scheme and obtain the nonperturbative running coupling constant in the deconfinement phase, where the magnitude of the Polyakov loop shows the nonzero values. We also investigate the system coupled to fundamental fermions. Since we use the naive staggered fermion with the twisted boundary condition in our simulation, only multiples of 12 are allowed for the number of flavors. According to the perturbative two-loop analysis, the N_f=12 SU(3) gauge theory might have a conformal fixed point in the infrared region. However, recent lattice studies show controversial results for the existence of the fixed point. We point out possible problems in previous work, and present our careful study. Finally, we find the infrared fixed point (IRFP) and discuss the robustness of the nontrivial IRFP of a many-flavor system under the change of the analysis method. Some preliminary results were reported in the proceedings [E. Bilgici et al., PoS(Lattice 2009), 063 (2009); Itou et al., PoS(Lattice 2010), 054 (2010)] and the letter paper [T. Aoyama et al., arXiv:1109.5806 [hep-lat

Itou, Etsuko

2013-08-01

79

Melting Temperature of High-Temperature Fixed Points for Thermocouple Calibrations  

NASA Astrophysics Data System (ADS)

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.

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

2011-01-01

80

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

Code of Federal Regulations, 2013 CFR

... 2013-10-01 false Operation of internal transmitter control systems through licensed fixed control points...LAND MOBILE RADIO SERVICES Transmitter Control Internal Transmitter Control Systems § 90.473 Operation of...

2013-10-01

81

Vacuum type N space-times admitting homothetic vector fields with isolated fixed points  

Microsoft Academic Search

We consider vacuum space-times (M, g) which are of Petrov type N on an open dense subset ofM, and which admit (proper) homothetic vector fields with isolated fixed points. We prove that if such is the case then, at the fixed point, (M,g) is flat and the homothetic bivector,X[a;b], is necessarily simple-timelike. Furthermore, we prove that if the homothetic bivector

J. da Costa; E. G. L. R. Vaz

1992-01-01

82

Exact finite-difference schemes for first order differential equations having three distinct fixed-points  

Microsoft Academic Search

We construct nonstandard finite-difference (NSFD) schemes that provide exact numerical methods for a first-order differential equation having three distinct fixed-points. An explicit, but also nonexact, NSFD scheme is also constructed. It has the feature of preserving the critical properties of the original differential equation such as the positivity of the solutions and the stability behavior of the three fixed-points.

Lih-Ing W. Roeger; Ronald E. Mickens

2007-01-01

83

Simulation-based word-length optimization method for fixed-point digital signal processing systems  

Microsoft Academic Search

Word-length optimization and scaling software that utilizes the fixed-point simulation results using realistic input signal samples is developed for the application to general, including nonlinear and time-varying, signal processing systems. Word-length optimization is conducted to minimize the hardware implementation cost while satisfying a fixed-point performance measure. In order to minimize the computing time, signal grouping and efficient search methods are

Wonyong Sung; Ki-Il Kum

1995-01-01

84

Self-action of a point charge in classical electrodynamics  

Microsoft Academic Search

A direct calculation demonstrates that the causal Green function for classical equations of an electromagnetic field contains an additional singular term cancelling the divergence in the self-action of a point charge. Thus, the problem of mass renormalization is avoided. An exact relativistic expression for the self-action force is presented as a sum of two terms. The first one gives the

A. N. Gordeyev

1995-01-01

85

Are judgments for action verbs and point-light human actions equivalent?  

PubMed

The aim of the present study was to examine whether the ability to judge action words and the ability to judge human actions share common mechanisms. With this purpose in mind, we proposed both a lexical and an action decision task to twenty-four healthy participants. For both tasks, the participants had to judge whether the stimulus that was presented (a letter string or a point-light sequence) was valid or not (i.e. a word vs. a pseudo-word, an action vs. a pseudo-action). The data analysis showed that the action decision task has common characteristics with the lexical decision task. As for verbal material, judgements of pseudo-actions were slower than judgements for actions. Moreover, we demonstrated that the ability to judge an action verb was positively correlated with the ability to judge a point-light human action, whereas no significant correlation appeared between nouns and point-light judgements abilities. This dissociation supports the argument that the judgement of action words and the judgement of human actions share a common but specific basis through the involvement of motor representations. PMID:25238900

Bidet-Ildei, Christel; Toussaint, Lucette

2015-02-01

86

Classical Electrodynamics of a Point Particle from Action Integral  

Microsoft Academic Search

A new approach to the classical electrodynamics of a point particle (with arbitrary finite number of electromagnetic moments) is presented. It is argued that the notion of a non-singular pointlike current, previously introduced by by the author, appropriately describes an electromagnetic point particle. This current is then used in the most standard action integral of an electromagnetic field in interaction

Andrzej Herdegen

1992-01-01

87

Reference in Action: Links between Pointing and Language  

ERIC Educational Resources Information Center

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…

Cooperrider, Kensy Andrew

2011-01-01

88

Fixed-point bifurcation analysis in biological models using interval polynomials theory.  

PubMed

The paper proposes a systematic method for fixed-point bifurcation analysis in circadian cells and similar biological models using interval polynomials theory. The stages for performing fixed-point bifurcation analysis in such biological systems comprise (i) the computation of fixed points as functions of the bifurcation parameter and (ii) the evaluation of the type of stability for each fixed point through the computation of the eigenvalues of the Jacobian matrix that is associated with the system's nonlinear dynamics model. Stage (ii) requires the computation of the roots of the characteristic polynomial of the Jacobian matrix. This problem is nontrivial since the coefficients of the characteristic polynomial are functions of the bifurcation parameter and the latter varies within intervals. To obtain a clear view about the values of the roots of the characteristic polynomial and about the stability features they provide to the system, the use of interval polynomials theory and particularly of Kharitonov's stability theorem is proposed. In this approach, the study of the stability of a characteristic polynomial with coefficients that vary in intervals is equivalent to the study of the stability of four polynomials with crisp coefficients computed from the boundaries of the aforementioned intervals. The efficiency of the proposed approach for the analysis of fixed-point bifurcations in nonlinear models of biological neurons is tested through numerical and simulation experiments. PMID:24817437

Rigatos, Gerasimos G

2014-06-01

89

Fixed point theorems for set-valued contractions in complete metric spaces  

NASA Astrophysics Data System (ADS)

The fixed point theory of set-valued contractions which was initiated by Nadler [S.B. Nadler Jr., Multi-valued contraction mappings, Pacific J. Math. 30 (1969) 475-488] was developed in different directions by many authors, in particular, by [S. Reich, Fixed points of contractive functions, Boll. Unione Mat. Ital. 5 (1972) 26-42; N. Mizoguchi, W. Takahashi, Fixed point theorems for multivalued mappings on complete metric spaces, J. Math. Anal. Appl. 141 (1989) 177-188; Y. Feng, S. Liu, Fixed point theorems for multi-valued contractive mappings and multi-valued Caristi type mappings, J. MathE Anal. Appl. 317 (2006) 103-112]. In the present paper, the concept of contraction for set-valued maps in metric spaces is introduced and the conditions guaranteeing the existence of a fixed point for such a contraction are established. One of our results essentially generalizes the Nadler and Feng-Liu theorems and is different from the Mizoguchi-Takahashi result. The second result is different from the Reich and Mizoguchi-Takahashi results. The method used in the proofs of our results is inspired by Mizoguchi-Takahashi and Feng-Liu's ideas. Comparisons and examples are given.

Klim, D.; Wardowski, D.

2007-10-01

90

One-parameter semigroups of analytic functions, fixed points and the Koenigs function  

NASA Astrophysics Data System (ADS)

Analogues of the Berkson-Porta formula for the infinitesimal generator of a one-parameter semigroup of holomorphic maps of the unit disc into itself are obtained in the case when, along with a Denjoy-Wolff point, there also exist other fixed points. With each one-parameter semigroup a so-called Koenigs function is associated, which is a solution, common for all elements of the one-parameter semigroup, of a certain functional equation (Schröder's equation in the case of an interior Denjoy-Wolff point and Abel's equation in the case of a boundary Denjoy-Wolff point). A parametric representation for classes of Koenigs functions that takes account of the Denjoy-Wolff point and other fixed points of the maps in the one-parameter semigroup is presented. Bibliography: 19 titles.

Goryainov, Victor V.; Kudryavtseva, Olga S.

2011-07-01

91

Holographic non-relativistic fermionic fixed point and bulk dipole coupling  

NASA Astrophysics Data System (ADS)

Inspired by the recently discovered non-relativistic fermionic fixed points, we investigate how the presence of bulk dipole coupling modifies the spectral function at one of these novel fixed points. As a result, although the infinite flat band is always visible in the presence of the bulk dipole coupling as well as chemical potential, the band is modified in a remarkable way at small momenta up to the order of magnitude of bulk dipole coupling. On the other hand, like a phoenix, a new Fermi surface sprouts from the formed gap when the bulk dipole coupling is pushed up further such as to overshadow the charge parameter, which is obviously different from what is found at the relativistic fixed points.

Li, Wei-Jia; Zhang, Hongbao

2011-11-01

92

Fe-C eutectic fixed-point cells for contact thermometry: an investigation and comparison  

NASA Astrophysics Data System (ADS)

Five iron-carbon (Fe-C) eutectic fixed-point cells have been constructed between NPL and LNE-Cnam to investigate the robustness and to measure the agreement of their melting temperatures. Each cell was constructed with a different selection of materials sourced by NPL and LNE-Cnam. The measured emfs at the Fe-C fixed-point temperature (~1153 °C), compared between cells, agree within around 1.98 µV (~90 mK), where the most important contribution to the uncertainty of each measurement is the inhomogeneity associated with the measuring Pt/Pd thermocouple. This demonstrates that these cells are suitable for use as secondary fixed-point cells in contact thermometry but the robustness of the presented cells is not found to be sufficient for maintaining their integrity during repeated cycling procedures.

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

2012-02-01

93

Fixed point theorems for multi-valued contractions in complete metric spaces  

NASA Astrophysics Data System (ADS)

In this paper the concept of a contraction for multi-valued mappings in a metric space is introduced and the existence theorems for fixed points of such contractions in a complete metric space are proved. Presented results generalize and improve the recent results of Y. Feng, S. Liu [Y. Feng, S. Liu, Fixed point theorems for multi-valued contractive mappings and multi-valued Caristi type mappings, J. Math. Anal. Appl. 317 (2006) 103-112], D. Klim, D. Wardowski [D. Klim, D. Wardowski, Fixed point theorems for set-valued contractions in complete metric spaces, J. Math. Anal. Appl. 334 (2007) 132-139] and several others. The method used in the proofs of our results is new and is simpler than methods used in the corresponding papers. Two examples are given to show that our results are genuine generalization of the results of Feng and Liu and Klim and Wardowski.

Ciric, Ljubomir

2008-12-01

94

Non-perturbative fixed points and renormalization group improved effective potential  

NASA Astrophysics Data System (ADS)

The stability conditions of a renormalization group improved effective potential have been discussed in the case of scalar QED and QCD with a colorless scalar. We calculate the same potential in these models assuming the existence of non-perturbative fixed points associated with a conformal phase. In the case of scalar QED the barrier of instability found previously is barely displaced as we approach the fixed point, and in the case of QCD with a colorless scalar not only the barrier is changed but the local minimum of the potential is also changed.

Dias, A. G.; Gomez, J. D.; Natale, A. A.; Quinto, A. G.; Ferrari, A. F.

2014-12-01

95

Non-perturbative fixed points and renormalization group improved effective potential  

E-print Network

The stability conditions of a renormalization group improved effective potential have been discussed in the case of scalar QED and QCD with a colorless scalar. We calculate the same potential in these models assuming the existence of non-perturbative fixed points associated to a conformal phase. In the case of scalar QED the barrier of instability found previously is barely displaced as we approach the fixed point, and in the case of QCD with a colorless scalar not only the barrier is changed but the local minimum of the potential is also changed.

A. G. Dias; A. F. Ferrari; J. D. Gomez; A. A. Natale; A. G. Quinto

2014-07-07

96

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

PubMed Central

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

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

2014-01-01

97

A Common Fixed Point Theorem through Weak and SemiCompatibility in Fuzzy Metric Space  

NASA Astrophysics Data System (ADS)

In this paper, a common fixed point theorem for six self mappings has been established using the concept of semicompatibility and weak compatibility in Fuzzy metric space, which generalizes the result of Singh B.S., Jain A. and Masoodi A.A. [6

Singh, Deepak; Rathore, M. S.; Sisodia, Krishnapal Singh

2013-03-01

98

Development of temperature fixed points applicable to the calibration of thermometers in magnetic fields  

Microsoft Academic Search

Two temperature fixed points, (H2O and Ar) were developed to be used under magnetic fields. They serve as ideal tools to investigate the magnetic field dependence of temperature sensors. The sensors studied are Cernox™, a platinum resistance thermometer, and a thermistor. The magnetic field effect on Cernox was found to be not larger than 5 mK under 15 T at

Koichi Nara

2004-01-01

99

Fixed point controllers and stabilization of the cart-pole system and the rotating pendulum  

Microsoft Academic Search

We consider stabilization of nonlinear systems in a special normal form as the cascade of a nonlinear subsystem and a linear subsystem. These systems do not possess any particular triangular structure. Despite this fact, we show how a backstepping type procedure applied to these systems naturally leads to a fixed point equation in the control input. We give conditions for

Reza Olfati-Saber

1999-01-01

100

Melting Temperatures of Eutectic Fixed-Point Cells Usable for the Calibration of Contact Thermometers  

NASA Astrophysics Data System (ADS)

The objective of the present investigation was the determination of the melting temperatures of the eutectic compounds Fe C, Co C, and Ni C. Six eutectic fixed-point cells of the Physikalisch-Technische Bundesanstalt (PTB) (Fe C1, Fe C2, Co C1, Co C2, Ni C1, and Ni C2) and two cells of the Brazilian National Metrological Institute (Inmetro) (Fe C1V and Ni C1V), useable for the calibration of contact thermometers, were investigated. Their melting temperatures were calculated by extrapolation of the emf-temperature characteristics of four stable Pt/Pd thermocouples, which were calibrated at the eutectic fixed points and at conventional fixed points of the International Temperature Scale of 1990 (ITS-90). On the basis of the eight eutectic fixed-point cells and seven independent calibration runs, the melting temperatures of the Fe C, Co C, and Ni C eutectics resulted in 1153.67 ± 0.15°C, 1323.81 ± 0.27°C, and 1328.48 ± 0.20°C, respectively, with expanded uncertainties corresponding to a coverage factor of k = 2.

Edler, F.; Ederer, P.; Baratto, A. C.; Vieira, H. D.

2007-12-01

101

Inversion of STEP-Observation Equation Using Banach's Fixed-Point Principle  

E-print Network

Inversion of STEP-Observation Equation Using Banach's Fixed-Point Principle Wotfgang Keller Geodetic Institute, Stuttgart University, Stuttgart, Germany 1 Introduction Satellite gradiometry is a subject of geodetic research for several years. A satellite gradiometry mission called STEP, is expected

Stuttgart, Universität

102

Fixed point theorem in probabilistic inner product spaces and its applications  

Microsoft Academic Search

In this paper, we obtain a new fixed point theorem in complete probabilistic ?-inner product space. As an example of applications,\\u000a we utilize the results of this paper to study the existence and uniqueness of solutions for linear Valterra integral equation.

Huang Xiao-Qin; Zhu Chuan-xi; Liu Xiao-Jie

2005-01-01

103

FIXED POINTS OF COMPOSITIONS OF EARTHQUAKES FRANCESCO BONSANTE AND JEANMARC SCHLENKER  

E-print Network

FIXED POINTS OF COMPOSITIONS OF EARTHQUAKES FRANCESCO BONSANTE AND JEAN­MARC SCHLENKER Abstract # r and E µ r be the right earthquakes on # and µ respectively. We show that the composition E # r # E estimates from the geometry of those AdS manifolds. 1. Introduction, main results 1.1. Earthquakes

Schlenker, Jean-Marc

104

FIXED POINTS OF COMPOSITIONS OF EARTHQUAKES FRANCESCO BONSANTE AND JEAN-MARC SCHLENKER  

E-print Network

FIXED POINTS OF COMPOSITIONS OF EARTHQUAKES FRANCESCO BONSANTE AND JEAN-MARC SCHLENKER Abstract and Eµ r be the right earthquakes on and µ respectively. We show that the composition E r Eµ r has the geometry of those AdS manifolds. 1. Introduction, main results 1.1. Earthquakes. In this paper we consider

Schlenker, Jean-Marc

105

Viscosity approximation methods for equilibrium problems and fixed point problems in Hilbert spaces  

Microsoft Academic Search

In this paper, we introduce an iterative scheme by the viscosity approximation method for finding a common element of the set of solutions of an equilibrium problem and the set of fixed points of a nonexpansive mapping in a Hilbert space. Then, we prove a strong convergence theorem which is connected with Combettes and Hirstoaga's result [P.L. Combettes, S.A. Hirstoaga,

Satoru Takahashi; Wataru Takahashi

2007-01-01

106

Emulating TCP (A Reliable Internet Protocol) Using a Fixed Point Algorithm  

Microsoft Academic Search

The feedback nature of reliable Internet protocols can be represented by a fixed point algorithm (FPA). The network signals congestion based on the aggregate traffic offered to it and each source adjusts its sending rate based on the feedback from the network to reach the network operating regime. The algorithms of reliable (transport) protocols are based on this fact. The

Debessay Fesehaye Kassa

2006-01-01

107

Performance Analysis of Reliable Internet Protocols (TCP) Using a Fixed Point Algorithm  

Microsoft Academic Search

The feedback nature of reliable Internet protocols can be re presented by a fixed point algorithm (FPA). The network signals congestio n based on the aggregate traffic offered to it and each source adjusts its se nding rate based on the feedback from the network to reach the network operating regime. The algorithms of reliable (transport) protocols are based on

Debessay Fesehaye

108

PHYSICAL REVIEW B 89, 045133 (2014) Conducting fixed points for inhomogeneous quantum wires  

E-print Network

it is necessary to couple it to some leads or reservoirs, normally a two-dimensional electron gas (2DEGPHYSICAL REVIEW B 89, 045133 (2014) Conducting fixed points for inhomogeneous quantum wires Colombia, Canada, V6T 1Z1 (Received 29 October 2013; published 24 January 2014) Inhomogeneities

Eggert, Sebastian

109

Bilateral Comparison of Mercury and Gallium Fixed-Point Cells Using Standard Platinum Resistance Thermometer  

NASA Astrophysics Data System (ADS)

The objective of project EURAMET 1127 (Bilateral comparison of triple point of mercury and melting point of gallium) in the field of thermometry is to compare realization of a triple point of mercury (-38.8344 °C) and melting point of gallium (29.7646 °C) between the Slovenian national laboratory MIRS/UL-FE/LMK and the Croatian national laboratory HMI/FSB-LPM using a long-stem 25 ? standard platinum resistance thermometer (SPRT). MIRS/UL/FE-LMK participated in a number of intercomparisons on the level of EURAMET. On the other hand, the HMI/LPM-FSB laboratory recently acquired new fixed-point cells which had to be evaluated in the process of intercomparisons. A quartz-sheathed SPRT has been selected and calibrated at HMI/LPM-FSB at the triple point of mercury, the melting point of gallium, and the water triple point. A second set of measurements was made at MIRS/UL/FE-LMK. After its return, the SPRT was again recalibrated at HMI/LPM-FSB. In the comparison, the W value of the SPRT has been used. Results of the bilateral intercomparison confirmed that the new gallium cell of the HMI/LPM-FSB has a value that is within uncertainty limits of both laboratories that participated in the exercise, while the mercury cell experienced problems. After further research, a small leakage in the mercury fixed-point cell has been found.

Bojkovski, J.; Veliki, T.; Zvizdi?, D.; Drnovšek, J.

2011-08-01

110

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

SciTech Connect

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.

Wos, L.; McCune, W.

1988-09-01

111

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

E-print Network

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.

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

2013-09-10

112

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

E-print Network

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.

Fitzpatrick, A Liam; Kaplan, Jared; Raghu, S

2013-01-01

113

Many-body localization in one dimension as a dynamical renormalization group fixed point.  

PubMed

We formulate a dynamical real space renormalization group (RG) approach to describe the time evolution of a random spin-1/2 chain, or interacting fermions, initialized in a state with fixed particle positions. Within this approach we identify a many-body localized state of the chain as a dynamical infinite randomness fixed point. Near this fixed point our method becomes asymptotically exact, allowing analytic calculation of time dependent quantities. In particular, we explain the striking universal features in the growth of the entanglement seen in recent numerical simulations: unbounded logarithmic growth delayed by a time inversely proportional to the interaction strength. This is in striking contrast to the much slower entropy growth as loglogt found for noninteracting fermions with bond disorder. Nonetheless, even the interacting system does not thermalize in the long time limit. We attribute this to an infinite set of approximate integrals of motion revealed in the course of the RG flow, which become asymptotically exact conservation laws at the fixed point. Hence we identify the many-body localized state with an emergent generalized Gibbs ensemble. PMID:23432299

Vosk, Ronen; Altman, Ehud

2013-02-01

114

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

NASA Astrophysics Data System (ADS)

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.

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

2013-09-01

115

Realization of Open Copper Fixed-Point Cells for Thermocouple Calibration  

NASA Astrophysics Data System (ADS)

BNM-LNE had studied Pt/Pd thermocouple behavior with the aim of adopting this type of sensor as an approximation of the ITS-90 above 660 °C. In order to complete a set of fixed-point cells which are available for the calibration of Pt/Pd thermocouples and other Pt-based thermocouples, BNM-LNE has recently developed an open copper fixed-point cell. This cell was developed as a test cell in order to improve the realization method, to estimate uncertainty contributions and also to determine the freezing temperature traceable to ITS-90. The cell was checked using a copper fixed-point mini-cell. This paper describes all the steps of the construction needed for cell realization and its characterization. The choice to manufacture an open cell at this point is justified in the paper. Metal impurities, metal filling conditions in the cell and atmospheric pressure effects are studied. The freezing temperature of ITS-90 was preliminarily estimated by contact thermometry awaiting a comparison with a radiation thermometry realization. The consistency of this estimated uncertainty will be confirmed by a comparison with other NMI facilities organized in Europe (Euromet project 624). This comparison is under process.

Megharfi, Mohammed; Devin, Eric; Royer, Anne; Morice, Ronan

2003-09-01

116

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

PubMed

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

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

2014-11-21

117

Quadratic recurrence equations - exact explicit solution of period four fixed points functions in bifurcation diagram  

E-print Network

This article presents the exact solution of fixed points functions for the cycle of period four of the quadratic recurrence equations. The solution is demonstrated for the quadratic map and the logistic map. These recurrence equations, presenting the real domain, as well as the Mandelbrot set, presenting the complex domain, are at the very heart of dynamical systems and chaos theory. Up to now, the closed explicit solutions of fixed points functions have only been known for three bifurcation ranges: for the cycles of period one, two and three. With the discovery of the solution for cycle four, disclosed in this paper, further step has been made in our comprehension of simultaneous complexity and simplicity which represents the beauty of nature.

Gvozden Rukavina

2008-02-19

118

Fixed-Point Quantum Search with an Optimal Number of Queries  

NASA Astrophysics Data System (ADS)

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 ? .

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

2014-11-01

119

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

E-print Network

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.

Igor N. Gashenenko

2012-12-09

120

Convergence of the Fixed Point Algorithm of Analytical Models of Reliable Internet Protocols (TCP)  

Microsoft Academic Search

\\u000a Analytical models are important tools for the performance investigation of the Internet. The literature shows that the fixed\\u000a point algorithm (FPA) is one of the most useful ways of solving analytical models of Internet performance.\\u000a \\u000a \\u000a Apart from what is observed in experimental literature, no comprehensive proof of the convergence and uniqueness of the FPA\\u000a is given. In this paper we

Debessay Fesehaye Kassa; Sabine Wittevrongel

2006-01-01

121

Long-Term Monitoring of Thermocouple Stability with Miniature Fixed-Point Cells  

NASA Astrophysics Data System (ADS)

In the framework of the European Metrology Research Programme ENG08 "MetroFission" project, two National Measurement Institutes, LNE-Cnam (France) and NPL (UK), have cooperatively developed methods of in situ validation of thermocouple output for application in next-generation nuclear fission power plants. Miniature fixed-point cells for use at three temperatures were constructed in the first step of this project: at the freezing point of silver (), the freezing point of copper (), and the melting point of the iron-carbon eutectic (). This paper reports the results of a second step in the study, where the robustness of the self-validation method has been investigated. Typical industrial Type N thermocouples have been employed with each of the miniature fixed-point devices installed, and repeatedly thermally cycled through the melting and freezing transitions of the fixed-point ingots. The devices have been exposed to a total of up to 90 h in the molten state. Furthermore, the LNE-Cnam devices were also subjected to fast cool-down rates, on five occasions, where the rate is estimated to have been between and . The devices are shown to be repeatable, reliable, and robust over the course of these tests. The drift of the Type N thermocouple has been identified separately to the behavior of the device. A reliable method for improving thermocouple performance and process control is therefore demonstrated. Requirements for implementation and the advantages of each approach for monitoring and correcting thermocouple drift are discussed, and an uncertainty budget for self-validation is presented.

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

2014-04-01

122

Strong-Disorder Fixed Point in the Dissipative Random Transverse-Field Ising Model  

NASA Astrophysics Data System (ADS)

The interplay between disorder, quantum fluctuations, and dissipation is studied in the random transverse Ising chain coupled to a dissipative Ohmic bath with a real space renormalization group. A typically very large length scale L* is identified above which the physics of frozen clusters dominates. Below L* a strong-disorder fixed point determines scaling at a pseudocritical point. In a Griffiths-McCoy region frozen clusters produce already a finite magnetization resulting in a classical low temperature behavior of the susceptibility and specific heat. These override the confluent singularities that are characterized by a continuously varying exponent z and are visible above a temperature T*˜L*-z.

Schehr, Grégory; Rieger, Heiko

2006-06-01

123

Isotopic effects in the neon fixed point: uncertainty of the calibration data correction  

NASA Astrophysics Data System (ADS)

The neon triple point is one of the defining fixed points of the International Temperature Scale of 1990 (ITS-90). Although recognizing that natural neon is a mixture of isotopes, the ITS-90 definition only states that the neon should be of ‘natural isotopic composition’, without any further requirements. A preliminary study in 2005 indicated that most of the observed variability in the realized neon triple point temperatures within a range of about 0.5?mK can be attributed to the variability in isotopic composition among different samples of ‘natural’ neon. Based on the results of an International Project (EUROMET Project No. 770), the Consultative Committee for Thermometry decided to improve the realization of the neon fixed point by assigning the ITS-90 temperature value 24.5561?K to neon with the isotopic composition recommended by IUPAC, accompanied by a quadratic equation to take the deviations from the reference composition into account. In this paper, the uncertainties of the equation are discussed and an uncertainty budget is presented. The resulting standard uncertainty due to the isotopic effect (k = 1) after correction of the calibration data is reduced to (4 to 40)??K when using neon of ‘natural’ isotopic composition or to 30??K when using 20Ne. For comparison, an uncertainty component of 0.15?mK should be included in the uncertainty budget for the neon triple point if the isotopic composition is unknown, i.e. whenever the correction cannot be applied.

Steur, Peter P. M.; Pavese, Franco; Fellmuth, Bernd; Hermier, Yves; Hill, Kenneth D.; Seog Kim, Jin; Lipinski, Leszek; Nagao, Keisuke; Nakano, Tohru; Peruzzi, Andrea; Sparasci, Fernando; Szmyrka-Grzebyk, Anna; Tamura, Osamu; Tew, Weston L.; Valkiers, Staf; van Geel, Jan

2015-02-01

124

Robust Optimization of Fixed Points of Nonlinear Discrete Time Systems with Uncertain Parameters  

NASA Astrophysics Data System (ADS)

This contribution extends the normal vector method for the optimization of parametrically uncertain dynamical systems to a general class of nonlinear discrete time systems. Essentially, normal vectors are used to state constraints on dynamical properties of fixed points in the optimization of discrete time dynamical systems. In a typical application of the method, a technical dynamical system is optimized with respect to an economic profit function, while the normal vector constraints are used to guarantee the stability of the optimal fixed point. We derive normal vector systems for flip, fold, and Neimark-Sacker bifurcation points, because these bifurcation points constitute the stability boundary of a large class of discrete time systems. In addition, we derive normal vector systems for a related type of critical point that can be used to ensure a user-specified disturbance rejection rate in the optimization of parametrically uncertain systems. We illustrate the method by applying it to the optimization of a discrete time supply chain model and a discretized fermentation process model.

Kastsian, Darya; Monnigmann, Martin

2010-01-01

125

ANALYTICAL ACCURACY EVALUATION OF FIXED-POINT SYSTEMS Romuald Rocher, Daniel Menard, Olivier Sentieys and Pascal Scalart  

E-print Network

ANALYTICAL ACCURACY EVALUATION OF FIXED-POINT SYSTEMS Romuald Rocher, Daniel Menard, Olivier be con- verted into a fixed-point specification. This conversion re- quires accuracy evaluation to ensure elimination during a cast operation. These noises propagate through the system and modify computing accuracy

Paris-Sud XI, Université de

126

Realization of Low-Temperature Fixed Points of the ITS-90 at NMIJ/AIST  

NASA Astrophysics Data System (ADS)

A new model of sealed cells with three thermometer wells for calibration of capsule-type thermometers at low-temperature fixed points of the International Temperature Scale of 1990 has been developed at the National Metrology Institute of Japan (NMIJ). The melting curves of Ar and O2 obtained using the new cells show very flat plateaux and a linear temperature dependence as a function of the inverse liquid fraction (1/ F) over the range 1/ F = 1 to 1/ F = 20 with a narrow melting curve width of 0.1 mK. The melting curves of Ne obtained with the new cell also show very flat plateaux and approximately linear temperature dependence versus 1/ F and a narrow melting curve width of 0.1 mK, though with a slight concave structure at high 1/ F. The melting temperatures with the new cells agree with previous NMIJ sealed cells within 10 ?K, which is similar to the reproducibility of the realization of the triple points at NMIJ. The source dependence of the triple-point temperature of Ne was investigated by filling two of the new cells from different sources of Ne. The difference in the realized triple point temperatures between the two sources is 0.031 mK, consistent with that estimated from isotope analysis. The uncertainties in the calibration of standard platinum resistance thermometers at the low-temperature fixed points are summarized. The uncertainty of the calibration at the triple point of e-H2 has been reduced to about one-third of its value without the correction by making the isotopic correction on the basis of the technical annex for the ITS-90 in the mise en pratique for the definition of the kelvin.

Nakano, T.; Tamura, O.; Sakurai, H.

2007-12-01

127

RG fixed points in supergravity duals of 4-d field theory and asymptotically AdS spaces  

Microsoft Academic Search

Recently, it has been conjectured that supergravity solutions with two asymptotically AdS5 regions describe the RG flow of a 4-d field theory from a UV fixed point to an interacting IR fixed point. In this paper we lend support to this conjecture by showing that, in the UV (IR) limit, the two-point function of a minimally coupled scalar field depends

Massimo Porrati; A O Starinets

1999-01-01

128

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

NASA Astrophysics Data System (ADS)

We study the problem of disorder-free metals near a continuous quantum critical point. We depart from the standard paradigm [Hertz, Phys. Rev. B0556-280510.1103/PhysRevB.14.1165 14, 1165 (1976) and Millis, Phys. Rev. BPRBMDO0163-182910.1103/PhysRevB.48.7183 48, 7183 (1993)] 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.

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

2013-09-01

129

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

SciTech Connect

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.

Yamaguchi, Y.; Yamada, Y. [National Metrology Institute of Japan, AIST, Tsukuba, Ibaraki (Japan)] [National Metrology Institute of Japan, AIST, Tsukuba, Ibaraki (Japan)

2013-09-11

130

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

NASA Astrophysics Data System (ADS)

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).

Cheung, Pak-Leong; Ng, Tuen Wai

2014-10-01

131

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

SciTech Connect

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.

Dury, M. R.; Goodman, T. M.; Lowe, D. H.; Machin, G.; Woolliams, E. R. [National Physical Laboratory, Teddington (United Kingdom)] [National Physical Laboratory, Teddington (United Kingdom)

2013-09-11

132

Universal scaling at nonthermal fixed points of a two-component Bose gas  

NASA Astrophysics Data System (ADS)

Quasistationary far-from-equilibrium critical states of a two-component Bose gas are studied in two spatial dimensions. After the system has undergone an initial dynamical instability it approaches a nonthermal fixed point. At this critical point the structure of the gas is characterized by ensembles of (quasi)topological defects such as vortices, skyrmions, and solitons which give rise to universal power-law behavior of momentum correlation functions. The resulting power-law spectra can be interpreted in terms of strong-wave-turbulence cascades driven by particle transport into long-wavelength excitations. Scaling exponents are determined on both sides of the miscible-immiscible transition controlled by the ratio of the intraspecies to interspecies couplings. Making use of quantum turbulence methods, we explain the specific values of the exponents from the presence of transient (quasi)topological defects.

Karl, Markus; Nowak, Boris; Gasenzer, Thomas

2013-12-01

133

Quantum-corrected drift-diffusion models: Solution fixed point map and finite element approximation  

SciTech Connect

This article deals with the analysis of the functional iteration, denoted Generalized Gummel Map (GGM), proposed in [C. de Falco, A.L. Lacaita, E. Gatti, R. Sacco, Quantum-Corrected Drift-Diffusion Models for Transport in Semiconductor Devices, J. Comp. Phys. 204 (2) (2005) 533-561] for the decoupled solution of the Quantum Drift-Diffusion (QDD) model. The solution of the problem is characterized as being a fixed point of the GGM, which permits the establishment of a close link between the theoretical existence analysis and the implementation of a numerical tool, which was lacking in previous non-constructive proofs [N.B. Abdallah, A. Unterreiter, On the stationary quantum drift-diffusion model, Z. Angew. Math. Phys. 49 (1998) 251-275, R. Pinnau, A. Unterreiter, The stationary current-voltage characteristics of the quantum drift-diffusion model, SIAM J. Numer. Anal. 37 (1) (1999) 211-245]. The finite element approximation of the GGM is illustrated, and the main properties of the numerical fixed point map (discrete maximum principle and order of convergence) are discussed. Numerical results on realistic nanoscale devices are included to support the theoretical conclusions.

Falco, Carlo de [School of Mathematical Sciences, Dublin City University, Glasnevin, Dublin 9 (Ireland); Jerome, Joseph W. [Department of Mathematics, Northwestern University, 2033 Sheridan Road, Evanston, IL 60208-2730 (United States); Sacco, Riccardo [Dipartimento di Matematica 'F.Brioschi', Politecnico di Milano, via Bonardi 9, 20133 Milano (Italy)], E-mail: riccardo.sacco@polimi.it

2009-03-20

134

Design, Construction, and Evaluation of Ni-C Eutectic Fixed Points  

NASA Astrophysics Data System (ADS)

In this article the design, construction, and evaluation of eutectic fixed points for contact and non-contact measurements that have been recently developed at MIRS/UL/FE-LMK are presented. The design of the cells is made in such way that it can be used for only thermocouple calibration in vertical or horizontal furnaces, for calibration of pyrometers in a horizontal furnace, and for simultaneous calibration of contact and non-contact thermometers in a horizontal furnace. Special care has been taken to achieve repeatability and reproducibility of the transition temperatures and mechanical robustness of the cell. This includes also usage of a carbon sleeve in combination with carbon sheets, in a so-called hybrid design of the eutectic cell. With such a design, significant improvement in mechanical robustness of the cell and temperature stability of the cell has been achieved. All the measurements are performed within specially designed seven-zone furnaces within which different gradients, and different heating and cooling rates can be realized. The melting temperature of Ni-C ((1328.44 ± 0.70) °C) measured with a thermocouple type R, calibrated at the zinc, aluminum, silver, copper, and palladium fixed points, and a non-contact thermometer, calibrated by comparison against different blackbodies, agree within their expanded uncertainties of 0.7 °C and 1.5 °C, respectively.

Bojkovski, J.; Hiti, M.; Batagelj, V.; Drnovšek, J.

2011-08-01

135

Optimization of the thermogauge furnace for realizing high temperature fixed points  

SciTech Connect

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.

Wang, T.; Dong, W. [National Institute of Metrology (NIM), Beijing (China)] [National Institute of Metrology (NIM), Beijing (China); Liu, F. [AVIC China Precision Engineering Institute for Aircraft Industry, Beijing (China)] [AVIC China Precision Engineering Institute for Aircraft Industry, Beijing (China)

2013-09-11

136

Simultaneous Contact and Non-contact Measurements of the Melting Temperature of a Ni C Fixed-Point Cell  

NASA Astrophysics Data System (ADS)

A novel fixed-point cell design that allows simultaneous measurements using contact and non-contact thermometers was developed and investigated at PTB to realize the nickel-carbon (Ni C) fixed-point. The melting temperature indicated by the LP3 radiation thermometer amounted to (1328.86 ± 0.52)°C ( k = 2). The melting temperature of the Ni C fixed-point cell was also calculated by extrapolating the emf-temperature characteristics of two Pt/Pd thermocouples based on their calibrations at conventional fixed points of the ITS-90. The melting temperature of the Ni C eutectic amounts to (1328.44 ± 0.45)°C using thermocouple Pt/Pd 01/04, and to (1328.53 ± 0.46)°C using thermocouple Pt/Pd 01/05, with uncertainties for k = 2. The contact and non-contact thermometers agree well within the combined uncertainties.

Edler, F.; Hartmann, J.

2007-12-01

137

Unique normal forms near a degenerate elliptic fixed point in two-parametric families of area-preserving maps  

NASA Astrophysics Data System (ADS)

We derive simplified normal forms for an area-preserving map in a neighbourhood of a degenerate resonant elliptic fixed point. Such fixed points appear in generic families of area-preserving maps. We also derive a simplified normal form for a generic two-parametric family. The normal forms are used to analyse bifurcations of n-periodic orbits. In particular, for n ? 6 we find regions of parameters where the normal form has ‘meandering’ invariant curves.

Gelfreich, Vassili; Gelfreikh, Natalia

2014-07-01

138

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

NASA Astrophysics Data System (ADS)

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.

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

2013-09-01

139

Thermal modelling comparing high temperature fixed point measurements by contact and non-contact thermometry  

NASA Astrophysics Data System (ADS)

This paper reports thermal modelling that aims to establish if the measurement method - either by a radiation thermometer or by a thermocouple - significantly influences the measured temperature of the high temperature fixed points Co-C, Pd-C and Ru-C. It is clear that both measurement techniques have specific physical characteristics which may affect the temperature measured during the melting plateau. With the radiation thermometer, the radiation heat transfer is directly influenced by the environment because the back-wall is effectively viewing the cold outside environment. In the case of a thermocouple direct viewing of the outside world is blocked so radiation transport is significantly reduced; however, in the case of the thermocouple there is a different component of heat transfer, namely conduction from the thermowell walls in contact with the thermocouple along the thermocouple stem itself.

Castro, P.; Machin, G.; Pearce, J. V.

2013-09-01

140

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

NASA Technical Reports Server (NTRS)

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.

Shimada, Seiichi; Bock, Yehuda

1992-01-01

141

A fixed point method for perturbation of bimultipliers and Jordan bimultipliers in C?-ternary algebras  

NASA Astrophysics Data System (ADS)

Let A be a C?-ternary algebra. A C-bilinear T :A×A?A is called a C?-ternary algebra bi-multiplier, if it satisfies T([abc],d)=[T(a,b)cd], T(a,[bcd])=[abT(c,d)] for all a,b,c,d?A. Also, the mapping T :A×A?A is a called C?-ternary algebra Jordan bimultiplier, if it satisfies T([aaa],a)=[T(a,a)aa], T(a,[aaa])=[aaT(a,a)] for all a ?A. Using the fixed point method, we investigate the generalized Hyers-Ulam-Rassias stability of bimultipliers and Jordan bimultipliers in C?-ternary algebras. The concept of Hyers-Ulam-Rassias stability originated from the Th.M. Rassias' stability theorem that appeared in his paper: [Th. M. Rassias, Proc. Am. Math. Soc. 72, 297 (1978)].

Ebadian, A.; Ghobadipour, N.; Eshaghi Gordji, M.

2010-10-01

142

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

SciTech Connect

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.

Machin, G.; Woolliams, E. R. [National Physical Laboratory (NPL), Hampton Road, Teddington, Middlesex,TW11 0LW (United Kingdom)] [National Physical Laboratory (NPL), Hampton Road, Teddington, Middlesex,TW11 0LW (United Kingdom); Anhalt, K. [Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, 10587 Berlin (Germany)] [Physikalisch-Technische Bundesanstalt (PTB), Abbestrasse 2-12, 10587 Berlin (Germany); Bloembergen, P. [National Institute of Metrology (NIM), Bei San Huan Dong Lu No. 18, Beijing, 100013 (China)] [National Institute of Metrology (NIM), Bei San Huan Dong Lu No. 18, Beijing, 100013 (China); Sadli, M. [Laboratoire Commun de Métrologie (LNE-Cnam), 61, rue du Landy, 93210 Saint-Denis, La Plaine (France)] [Laboratoire Commun de Métrologie (LNE-Cnam), 61, rue du Landy, 93210 Saint-Denis, La Plaine (France); Yamada, Y. [National Measurement Institute of Japan (NMIJ), AIST, Tsukuba, Ibaraki (Japan)] [National Measurement Institute of Japan (NMIJ), AIST, Tsukuba, Ibaraki (Japan)

2013-09-11

143

Correlation Between Immersion Profile and Measured Value of Fixed-Point Temperature  

NASA Astrophysics Data System (ADS)

Assessment of thermal immersion effects in the melting and freezing points defined by the International Temperature Scale of 1990 is one of the vital issues of modern thermometry. In documents of the Consultative Committee for Thermometry, the deviation of the experimental immersion profile from the theoretical value of the hydrostatic effect at a height of about 3 cm to 5 cm from the thermometer well bottom is used for the estimation of the uncertainty due to unwanted thermal effects. This estimation assumes the occurrence of solely the hydrostatic effect all along the height of the well inner wall. Real distortions of the temperature gradient at the bottom and at the top part of the well caused by the change of heat-exchange conditions are not taken into account. To define more precisely the temperature gradient along the height of the well, a miniature PRT with a 30 mm sensitive element and a sheath length and diameter of about 60 mm and 6 mm, respectively, were used. Also, the measurements of fixed-points temperature at noticeably different slopes of immersion profiles due to variations of the thermometer heat exchange and phase transition realization conditions were produced by means of a standard platinum resistance thermometer (SPRT). The measurements were carried out at the tin and zinc freezing points. The immersion curves measured with a miniature thermometer demonstrated an increase of the temperature during its lifting in the first 1 cm to 3 cm above the bottom of the well. The measurement results at the zinc freezing point by means of the SPRT have not confirmed the correlation between the immersion curves, the received value of the Zn freezing temperature, and the estimation of its uncertainty.

Shulgat, O. S.; Fuksov, V. M.; Ivanova, A. G.; Gerasimov, S. F.; Pokhodun, A. I.

2014-04-01

144

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

SciTech Connect

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.

Hao, X.; Yuan, Z.; Wang, J.; Lu, X. [Division of Thermometry and Materials Evaluation, National Institute of Metrology, Beijing, China, 100013 (China)] [Division of Thermometry and Materials Evaluation, National Institute of Metrology, Beijing, China, 100013 (China)

2013-09-11

145

Self-testable industrial platinum resistance thermometers integrated with miniature mercury and indium fixed-point cells  

NASA Astrophysics Data System (ADS)

Miniature temperature fixed-point industrial platinum resistance thermometers (IPRTs) have been constructed to investigate the feasibility of a self-testable IPRT integrated with a mercury or indium fixed-point cell. The miniature cell was constructed from stainless steel with a combined small PRT sensor element inside it, and was contained within an IPRT protection tube. The reproducibilities of the freezing and melting temperatures measured using the mercury miniature cell were ±0.08 °C and ±0.63 °C, respectively. In the case of indium, only the melting temperature was taken into account, and its reproducibility was ±0.01 °C. The performance of both miniature fixed-point IPRTs was good enough to keep track of the long-term stability of the IPRTs in the order of 0.1 °C.

Kang, Kee Hoon; Kim, Yong-Gyoo; Gam, Kee Sool; Yang, Inseok

2007-09-01

146

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

SciTech Connect

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.

Gotoh, M. [National Research Council of Canada 1200 Montreal Road, Ottawa ON. Canada K1A 0R6 (Canada)] [National Research Council of Canada 1200 Montreal Road, Ottawa ON. Canada K1A 0R6 (Canada)

2013-09-11

147

Development of High-Temperature Fixed Points of Unknown Temperature Suitable for Key Comparisons  

NASA Astrophysics Data System (ADS)

During the last key comparison of local realizations of the International Temperature Scale of 1990 above the silver point, which used high stability tungsten strip lamps, it became clear that these artifacts can no longer be used to evaluate the real calibration and measuring capabilities (CMCs) of the participant laboratories. The intrinsic uncertainty of the lamps is actually larger than the claimed CMCs of most national laboratories. Ideally a set of driftless robust artifacts, preferably of unknown temperature, should be used for this purpose, as this would allow CMCs to be probed at the highest level. Currently such artifacts do not exist. High-temperature fixed points (HTFPs) have been the subject of intense study for more than 10 years. The research has come to an advanced state so much that the temperatures of some of them are well known to be within 1 K. This has rendered their use as comparison artifacts questionable as any comparison would not be blind. To address this issue, doped HTFPs have been developed which have had their transition temperature altered from that of the eutectic composition. Two Ni-C-Cu cells and two Ni-C-Sn were constructed by Inmetro with different quantities of Cu and Sn, respectively. These were compared to a reference Ni-C cell (nominal transition temperature of 1329 C) and the temperature differences from the pure state determined. In this paper the design, construction, and results of long-term stability are described. These promising results indicate that it is possible to make HTFPs with altered temperatures which are stable enough to serve as comparison artifacts.

Teixeira, R.; Machin, G.; Orlando, A.

2014-04-01

148

Fixed-point Algorithms for Constrained ICA and their Applications in fMRI Data Analysis  

PubMed Central

Constrained independent component analysis (CICA) eliminates the order ambiguity of standard ICA by incorporating prior information into the learning process to sort the components intrinsically. However, the original CICA (OCICA) and its variants depend on a learning rate, which is not easy to be tuned for various applications. To solve this problem, two learning-rate free CICA algorithms were derived in this paper using the fixed-point learning concept. A complete stability analysis was provided for the proposed methods, which also made a correction to the stability analysis given to OCICA. Variations for adding constraints either to the components or the associated time courses were derived too. Using synthetic data, the proposed methods yielded a better stability and a better source separation quality in terms of higher SNR and smaller performance index (PI) than OCICA. For the artificially generated brain activations, the new CICAs demonstrated a better sensitivity/specificity performance than standard univariate general linear model (GLM) and standard ICA. OCICA showed a similar sensitivity/specficity gain but failed to converge for several times. Using fMRI data acquired with a well-characterized sensorimotor task, the proposed CICAs yielded better sensitivity than OCICA, standard ICA, and GLM in all the target functional regions in terms of either higher t-values or larger suprathreshold cluster extensions using the same significance threshold. In addition, they were more stable than OCICA and standard ICA for analyzing the sensorimotor fMRI data. PMID:21908126

Wang, Ze

2011-01-01

149

Resource and Performance Evaluations of Fixed Point QRD-RLS Systolic Array through FPGA Implementation  

NASA Astrophysics Data System (ADS)

At present, when using space-time processing techniques with multiple antennas for mobile radio communication, real-time weight adaptation is necessary. Due to the progress of integrated circuit technology, dedicated processor implementation with ASIC or FPGA can be employed to implement various wireless applications. This paper presents a resource and performance evaluation of the QRD-RLS systolic array processor based on fixed-point CORDIC algorithm with FPGA. In this paper, to save hardware resources, we propose the shared architecture of a complex CORDIC processor. The required precision of internal calculation, the circuit area for the number of antenna elements and wordlength, and the processing speed will be evaluated. The resource estimation provides a possible processor configuration with a current FPGA on the market. Computer simulations assuming a fading channel will show a fast convergence property with a finite number of training symbols. The proposed architecture has also been implemented and its operation was verified by beamforming evaluation through a radio propagation experiment.

Yokoyama, Yoshiaki; Kim, Minseok; Arai, Hiroyuki

150

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

SciTech Connect

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.

Wang, T.; Bai, C.; Yuan, Z.; Dong, W.; Lu, X. [National Institute of Metrology (NIM), Beijing (China)] [National Institute of Metrology (NIM), Beijing (China); Sasajima, N.; Yamada, Y.; Ara, C. [National Metrology Institute of Japan, AIST (NMIJ, AIST), Tsukuba (Japan)] [National Metrology Institute of Japan, AIST (NMIJ, AIST), Tsukuba (Japan)

2013-09-11

151

Study on the melting and freezing behaviour of high temperature binary eutectic fixed points using differential scanning calorimetry  

NASA Astrophysics Data System (ADS)

We have measured the heat flux accompanying the melting or freezing of metal (or metalloid)-carbon eutectics, using differential scanning calorimetry (DSC) to identify appropriate binary systems for secondary thermometry fixed points. Well-known alloy systems such as Fe-C and Ni-C showed reproducible endothermic and exothermic peaks that represent melting and freezing reactions in the DSC measurement. Furthermore, a new Si-C system with a eutectic composition showed reproducible melting and freezing peaks in the DSC measurements. Based on the results by DSC, we identified the Si-SiC eutectic point as a possible eutectic fixed point. To confirm this possibility, we made a Si-SiC cell for thermocouple thermometry and measured its melting and freezing characteristics using a Pt/Pd thermocouple. The melting temperature of the Si-SiC eutectic was reproducible to within 0.02 °C (one standard deviation). From the results, we found that Si-SiC has possibility as a new eutectic fixed point at temperatures around 1400 °C. We also concluded that DSC analysis could be used to measure the reproducibility of freezing and melting reactions that are to be used as fixed points for thermometry, because it is a rapid and easy-to-use tool for characterizing the thermal behaviour of materials with only a small sample.

Kwon, Su Yong; Kim, Yong-Gyoo; Yang, Inseok

2010-06-01

152

A Floating-point Coprocessor Configured by a FPGA in a Digital Platform Based on Fixed-point DSP for Power Electronics  

Microsoft Academic Search

A configurable floating-point coprocessor by a FPGA is designed to enhance the computational capability of the digital platform based on the fixed-point DSP, with which the platform will be competent to implement intensively computational tasks. Detailed design procedures of the coprocessor are presented. A new division algorithm is proposed by combining the lookup-table algorithm and multiplicative algorithm in order to

Haibing Hu; Tianjun Jin; Xianmiao Zhang; Zhengyu Lu; Zhaoming Qian

2006-01-01

153

A cobalt carbon eutectic fixed point for the calibration of contact thermometers at temperatures above 1100 °C  

NASA Astrophysics Data System (ADS)

A vertical cobalt-carbon (Co-C) eutectic fixed point cell was constructed at PTB to demonstrate its use for improvement of the calibration of noble-metal thermocouples at temperatures above 1100 °C. The melting and freezing temperatures of the Co-C eutectic were measured in different high-temperature furnaces at PTB and INMETRO (Brazil) to show its stability by using a Pt/Pd thermocouple. The reproducibility of all measured electromotive forces at the inflection points of the melting curves amounts to a value of about 0.06 °C. No drift in the melting temperature was observed. Therefore, the Co-C eutectic fixed point cell can be used as an adequate transfer standard for dissemination of the International Temperature Scale of 1990 (ITS-90) in the temperature range above the freezing point of copper.

Edler, F.; Baratto, A. C.

2005-08-01

154

Thermodynamic Temperatures of High-Temperature Fixed Points: Uncertainties Due to Temperature Drop and Emissivity  

NASA Astrophysics Data System (ADS)

This study forms part of the European Metrology Research Programme project implementing the New Kelvin to assign thermodynamic temperatures to a selected set of high-temperature fixed points (HTFPs), Cu, Co-C, Pt-C, and Re-C. A realistic thermal model of these HTFPs, developed in finite volume software ANSYS FLUENT, was constructed to quantify the uncertainty associated with the temperature drop across the back wall of the cell. In addition, the widely applied software package, STEEP3 was used to investigate the influence of cell emissivity. The temperature drop, , relates to the temperature difference due to the net loss of heat from the aperture of the cavity between the back wall of the cavity, viewed by the thermometer, defining the radiance temperature, and the solid-liquid interface of the alloy, defining the transition temperature of the HTFP. The actual value of can be used either as a correction (with associated uncertainty) to thermodynamic temperature evaluations of HTFPs, or as an uncertainty contribution to the overall estimated uncertainty. In addition, the effect of a range of furnace temperature profiles on the temperature drop was calculated and found to be negligible for Cu, Co-C, and Pt-C and small only for Re-C. The effective isothermal emissivity is calculated over the wavelength range from 450 nm to 850 nm for different assumed values of surface emissivity. Even when furnace temperature profiles are taken into account, the estimated emissivities change only slightly from the effective isothermal emissivity of the bare cell. These emissivity calculations are used to estimate the uncertainty in the temperature assignment due to the uncertainty in the emissivity of the blackbody.

Castro, P.; Machin, G.; Bloembergen, P.; Lowe, D.; Whittam, A.

2014-07-01

155

Convergence Analysis and Numerical Study of a Fixed-Point Iterative Method for Solving Systems of Nonlinear Equations  

PubMed Central

We present a fixed-point iterative method for solving systems of nonlinear equations. The convergence theorem of the proposed method is proved under suitable conditions. In addition, some numerical results are also reported in the paper, which confirm the good theoretical properties of our approach. PMID:24795537

Huang, Na

2014-01-01

156

Fixed-point observation of Oncomelania nosophora in Kofu Basin—establishment of monitoring system of schistosomiasis japonica in Japan  

Microsoft Academic Search

There are still many Oncomelania snails that inhabit the Kofu Basin, Yamanashi Prefecture, Japan, which had been declared free of schistosomiasis japonica. Due to the need to monitor the situation, a fixed-point observation system using GIS from GPS is being examined. In addition, in broad present or former endemic areas, survey areas are being managed by remote sensing with satellite

Naoko Nihei; Noriaki Kajihara; Masashi Kirinoki; Yuichi Chigusa; Yasuhide Saitoh; Ryota Shimamura; Hiroyuki Kaneta; Hajime Matsuda

2003-01-01

157

A fixed-point algorithm for estimating amplification efficiency from a polymerase chain reaction dilution series.  

PubMed

BackgroundThe polymerase chain reaction amplifies and quantifies small amounts of DNA. It is a cyclic process, during each cycle of which each strand of template DNA is copied with probability approaching one: the amount of DNA approximately doubles and this amount can be estimated fluorimetrically each cycle, producing a set of fluorescence values hereafter referred to as the amplification curve. Commonly the biological question of relevance is one of the ratio of DNA concentrations in two samples: a ratio that is deduced by comparing the two amplification curves, usually by way of a plot of fluorescence against cycle number. Central to this analysis is measuring the extent to which one amplification curve is shifted relative to the other, a measurement often accomplished by defining a threshold or quantification cycle, C q , for each curve: the fractional cycle number at which fluorescence reaches some threshold or at which some other criterion (maximum slope, maximum rate of change of slope) is satisfied.We propose an alternative where position is measured relative to a reference curve; position equates to the cycle shift which maximizes the correlation between the reference and the observed fluorescence sequence. A key parameter of the reference curve is obtained by fixed-point convergence.ResultsWe consider the analysis of dilution series constructed for the estimation of qPCR amplification efficiency. The estimate of amplification efficiency is based on the slope of the regression line when the C q is plotted against the logarithm of dilution. We compare the approach to three commonly used methods for determining C q ; each is applied to publicly accessible calibration data sets, and to ten from our own laboratory. As in the established literature we judge their relative merits both from the standard deviation of the slope of the calibration curve, and from the variance in C q for replicate fluorescence curves.ConclusionsThe approach does not require modification of experimental protocols, and can be applied retrospectively to existing data. We recommend that it be added to the methodological toolkit with which laboratories interpret their real-time PCR data. PMID:25492416

Jones, Michael E; Mayne, George C; Wang, Tingting; Watson, David I; Hussey, Damian J

2014-12-10

158

Sequential super-stereotypy of an instinctive fixed action pattern in hyper-dopaminergic mutant mice: a model of obsessive compulsive disorder and Tourette's  

PubMed Central

Background Excessive sequential stereotypy of behavioral patterns (sequential super-stereotypy) in Tourette's syndrome and obsessive compulsive disorder (OCD) is thought to involve dysfunction in nigrostriatal dopamine systems. In sequential super-stereotypy, patients become trapped in overly rigid sequential patterns of action, language, or thought. Some instinctive behavioral patterns of animals, such as the syntactic grooming chain pattern of rodents, have sufficiently complex and stereotyped serial structure to detect potential production of overly-rigid sequential patterns. A syntactic grooming chain is a fixed action pattern that serially links up to 25 grooming movements into 4 predictable phases that follow 1 syntactic rule. New mutant mouse models allow gene-based manipulation of brain function relevant to sequential patterns, but no current animal model of spontaneous OCD-like behaviors has so far been reported to exhibit sequential super-stereotypy in the sense of a whole complex serial pattern that becomes stronger and excessively rigid. Here we used a hyper-dopaminergic mutant mouse to examine whether an OCD-like behavioral sequence in animals shows sequential super-stereotypy. Knockdown mutation of the dopamine transporter gene (DAT) causes extracellular dopamine levels in the neostriatum of these adult mutant mice to rise to 170% of wild-type control levels. Results We found that the serial pattern of this instinctive behavioral sequence becomes strengthened as an entire entity in hyper-dopaminergic mutants, and more resistant to interruption. Hyper-dopaminergic mutant mice have stronger and more rigid syntactic grooming chain patterns than wild-type control mice. Mutants showed sequential super-stereotypy in the sense of having more stereotyped and predictable syntactic grooming sequences, and were also more likely to resist disruption of the pattern en route, by returning after a disruption to complete the pattern from the appropriate point in the sequence. By contrast, wild-type mice exhibited weaker forms of the fixed action pattern, and often failed to complete the full sequence. Conclusions Sequential super-stereotypy occurs in the complex fixed action patterns of hyper-dopaminergic mutant mice. Elucidation of the basis for sequential super-stereotypy of instinctive behavior in DAT knockdown mutant mice may offer insights into neural mechanisms of overly-rigid sequences of action or thought in human patients with disorders such as Tourette's or OCD. PMID:15710042

Berridge, Kent C; Aldridge, J Wayne; Houchard, Kimberly R; Zhuang, Xiaoxi

2005-01-01

159

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

E-print Network

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.

John Ray; Gerry Gilmore

2006-07-22

160

Consistent Newton-Raphson vs. fixed-point for variational multiscale formulations for incompressible Navier-Stokes  

E-print Network

The following paper compares a consistent Newton-Raphson and fixed-point iteration based solution strategy for a variational multiscale finite element formulation for incompressible Navier-Stokes. The main contributions of this work include a consistent linearization of the Navier-Stokes equations, which provides an avenue for advanced algorithms that require origins in a consistent method. We also present a comparison between formulations that differ only in their linearization, but maintain all other equivalences. Using the variational multiscale concept, we construct a stabilized formulation (that may be considered an extension of the MINI element to nonlinear Navier-Stokes). We then linearize the problem using fixed-point iteration and by deriving a consistent tangent matrix for the update equation to obtain the solution via Newton-Raphson iterations. We show that the consistent formulation converges in fewer iterations, as expected, for several test problems. We also show that the consistent formulation ...

Turner, D Z; Hjelmstad, K D

2008-01-01

161

Fixed-Point FastICA Algorithms for the Blind Separation of Complex-Valued Signal Mixtures  

Microsoft Academic Search

In this paper, we derive new fixed-point algorithms for the blind separation of complex-valued mixtures of independent, possibly non-circularly-symmetric, and non-Gaussian source signals. Leveraging recent results in complex independent component analysis, we construct iterative procedures for complex signal mixtureswhose evolutionarycharacteristics are identical to those of the real-valued FastICA algorithmwithkurtosiscontrast. Our methodsare fast,computationallysimple, and easy touse. For extractingmultiple sources, symmetric and

Scott C. Douglas

2005-01-01

162

Dirac's monopole without strings: Classical Lagrangian theory. [Point charge interactions, action integral  

Microsoft Academic Search

The non-quantum-mechanical interaction of a Dirac magnetic monopole and a point charge through the electromagnetic field is studied. A classical action integral which is multiple-valued is found. Stability of this action integral against variations of the world lines of the point charge and the monopole, and against variations of the electromagnetic potentials, yields the correct Lorentz equations of motion of

T. T. Wu; C. N. Yang

1976-01-01

163

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

SciTech Connect

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.

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

2004-04-28

164

Fixed-point vs. floating-point arithmetic comparison for adaptive optics real-time control computation  

Microsoft Academic Search

Most computers in the past have been equipped with floating point processing capabilities, allowing an easy and brute-force solution for the machine computation errors, not requiring any specific tailoring of the computation in nearly hundred percent of situations. However, the computation needed for the adaptive optics real-time control in 30-50 meter telescopes is big enough to cause trouble to conventional

Yolanda Martín-Hernando; Luis F. Rodríguez-Ramos; Marcos R. Garcia-Talavera

2008-01-01

165

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

DOEpatents

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.

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

1992-01-01

166

Criticality governed by the stable renormalization fixed point of the Ising model in the hierarchical small-world network  

NASA Astrophysics Data System (ADS)

We study the Ising model in a hierarchical small-world network by renormalization group analysis and find a phase transition between an ordered phase and a critical phase, which is driven by the coupling strength of the shortcut edges. Unlike ordinary phase transitions, which are related to unstable renormalization fixed points (FPs), the singularity in the ordered phase of the present model is governed by the FP that coincides with the stable FP of the ordered phase. The weak stability of the FP yields peculiar criticalities, including logarithmic behavior. On the other hand, the critical phase is related to a nontrivial FP, which depends on the coupling strength and is continuously connected to the ordered FP at the transition point. We show that this continuity indicates the existence of a finite correlation-length-like quantity inside the critical phase, which diverges upon approaching the transition point.

Nogawa, Tomoaki; Hasegawa, Takehisa; Nemoto, Koji

2012-09-01

167

Metformine : le point sur les mcanismes d'action Metformin: new insights on the mechanisms of action  

E-print Network

1 Metformine : le point sur les mécanismes d'action Metformin: new insights on the mechanisms-Salpêtrière (AP-HP), Université Pierre et Marie Curie-Paris 6, Paris, France Mots-clés : Metformine ­ Diabète de type 2 ­ AMPK ­ Métabolisme énergétique Keywords : Metformin ­ Type 2 diabetes ­ AMPK ­ Energy

Paris-Sud XI, Université de

168

Superior accuracy of Ostrowski homotopy continuation method with quadratic Bezier homotopy and linear fixed point functions for nonlinear equations  

NASA Astrophysics Data System (ADS)

Homotopy continuation methods (HCM) can be used to find the zeros of nonlinear equations. An advantage of HCM is that this method is able resolve divergence problems which might be faced by classical methods. In this paper, we utilize Ostrowski-HCM (OHCM) with quadratic Bezier homotopy function (QBHF) and linear fixed-point (LFP) function in order to improve the accuracy of solutions. We compare the performance of our proposed method with Newton's method (NM) and Ostrowski's method (OM). The results obtained indicate that Ostrowski-HCM with these additional functions performs better compared to the Newton's and Ostrowski's methods.

Nor, Hafizudin Mohamad; Rahman, Amirah; Ismail, Ahmad Izani Md.; Majid, Ahmad Abd.

2014-12-01

169

FPGA Implementation of a Best-Precision Fixed-Point Digital PID Controller  

Microsoft Academic Search

Proportional-integral-derivative (PID) controllers have been broadly used in many areas. Compared with analog controllers, digital ones by digital signal processor (DSP) or field programmable gate arrays (FPGA) are more stable and easier to adjust parameter. Digital controllers are usually implemented with FPGA for its fast and stable performance. When it is implemented with FPGA, floating-point arithmetic is usually converted to

Yankai Xu; Kai Shuang; Shan Jiang; Xiaoliang Wu

2009-01-01

170

Fixing the crossover point from exploration to development in the hard-minerals industry  

SciTech Connect

A plan is presented for securing federal income tax development-stage expenditures as early as possible in a hard-rock mining program. The main purpose for expediting this transition is to avoid the ordinary income recapture implications associated with exploration expenditures that are not applicable to development expenditures. This article is arranged in the same order as the chronological life of the mine, the exploration phase followed by the development phase. The fourth section sets forth action steps to document the transition from the exploration to development stage of mining operations for tax purposes. This article does not cover units of property, areas of interest containing two or more mines, or the mechanics of recapturing exploration expenses. The last section addresses state environmental laws and the expected conflict of simultaneously being in different mining stages for different purposes.

Tripp, J.C.; Berg, R.A.

1984-06-01

171

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

NASA Astrophysics Data System (ADS)

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.

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

2008-02-01

172

Perceiving the Direction of Articulatory Motion in Point-Light Actions  

PubMed Central

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

Davila, Alex; Schouten, Ben; Verfaillie, Karl

2014-01-01

173

CORRECTIVE ACTION PLAN FOR CORRECTIVE ACTION UNIT 516: SEPTIC SYSTEMS AND DISCHARGE POINTS, NEVADA TEST SITE, NEVADA  

SciTech Connect

Corrective Action Unit (CAU) 516, Septic Systems and Discharge Points, is listed in the ''Federal Facility Agreement and Consent Order'' (FFACO) of 1996 (FFACO, 1996). CAU 516 consists of six Corrective Action Sites (CASs) located in Areas 3, 6, and 22 of the Nevada Test Site (NTS), which is located approximately 65 miles northwest of Las Vegas, Nevada (Figure 1). CAU 516 is comprised of the following six CASs: (1) 03-59-01 Building 3C-36 Septic System; (2) 03-59-02 Building 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 (6) 22-19-04 Vehicle Decontamination Area. Details on site history and site characterization results for CAU 516 are provided in the approved Corrective Action Investigation Plan (CAIP), (U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office [NNSA/NSO], 2003), and the approved Corrective Action Decision Document (CADD) (NNSA/NSO, 2004).

BECHTEL NEVADA; U.S. DEPARTMENT OF ENERGY, NATIONAL NUCLEAR SECURITY ADMINISTRATION NEVADA SITE OFFICE

2005-08-01

174

Newton-Raphson method and fixed-point technique in finite element computation of magnetic field problems in media with hysteresis  

Microsoft Academic Search

A comparison between the Newton-Raphson method and the fixed-point technique in hysteretic magnetic field problems is presented. Four different approaches are studied and contrast between them in terms of the convergence rate and computation time consumption is highlighted. The Newton-Raphson-based approaches are found better than the iteration schemes associated with the fixed-point technique for a model problem

Jlilius Saitz

1999-01-01

175

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

E-print Network

Action Research on Underpinnings for Physics by Jeffrey Hengesbach, Mountain Pointe High School with examining the science background (underpinnings) appropriate for students starting high school physics to physics. In many cases, at the high school level it is the first opportunity a student has to truly

Steinberg, Richard N.

176

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

NASA Astrophysics Data System (ADS)

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.

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

2014-07-01

177

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  

Microsoft Academic Search

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):;\\u000a 06-20-04, National

Grant Evenson

2008-01-01

178

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

USGS Publications Warehouse

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.

Selbig, William R.; Bannerman, Roger T.

2011-01-01

179

New fixed point theorems for mixed monotone operators and local existence–uniqueness of positive solutions for nonlinear boundary value problems  

Microsoft Academic Search

In this article we present a new fixed point theorem for a class of general mixed monotone operators, which extends the existing corresponding results. Moreover, we establish some pleasant properties of nonlinear eigenvalue problems for mixed monotone operators. Based on them the local existence–uniqueness of positive solutions for nonlinear boundary value problems which include Neumann boundary value problems, three-point boundary

Chengbo Zhai; Lingling Zhang

2011-01-01

180

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

SciTech Connect

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.

NSTec Environmental Restoration

2007-02-01

181

Europ. J. Combinatorics (1989) 10,149-160 Intersecting Families of Finite Sets and Fixed-point-Free 2-Elements  

E-print Network

i1 Europ. J. Combinatorics (1989) 10,149-160 Intersecting Families of Finite Sets and Fixed is realised, for any n, by the (non-regular) family consisting of all sets containing a fixed x E X. However, there are many other families attaining the bound. (We give a general construction in section 2.) Ifn is odd

Kantor, William M.

182

Current Work on Furnaces and Data Analysis to Improve the Uniformity and Noise Levels for Metal Fixed Points  

NASA Astrophysics Data System (ADS)

Ongoing work to improve the uniformity of vertically mounted furnaces, manufactured by Carbolite (e.g., Type TZF12/75—three-zone furnace capable of 1200 °C, with 75 mm inner bore) along the axis and across the working tube and/or equalizing block is reported. This involves adjusting the size of the end zones, the position of the control thermometers, and the use of cascade-control methods. Means regularly used at NPL to reduce electrical noise in some commercially available ac furnaces through a reduction in the voltage used to “fire” the heaters, and better use of thyristor controllers (by extending their cycle time) are described. The need to shield the controllers from local magnetic fields is described. With these measures, the electrical noise from ac furnaces can approach that of dc furnaces, without the large cost of a dc power supply. The application of new data analysis techniques (Allan deviation) will be shown to improve the representation of uninterrupted fixed-point traces (as used in ingot verification rather than PRT calibration). Reduction of statistical noise on the temperature measurements has been achieved for data on the freezing plateau by determining the statistically optimum averaging time. This shows that the statistical uncertainty in the determination of the temperature of a particular freezing plateau is less than 25 ?K and that noise (drift) from other sources, possibly due to variations in room temperature, starts to become appreciable over periods longer than a few tens of minutes. The measurement of freezing and melting plateaux at this level is aided by the introduction of new ASL-F900 bridge(s), and quieter/larger standard resistor baths.

Head, D. I.; Gray, J.; de Podesta, M.

2009-02-01

183

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

PubMed Central

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

2014-01-01

184

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

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…

Bellver-Cebreros, Consuelo; Rodriguez-Danta, Marcelo

2009-01-01

185

Strong convergence theorems for a common fixed point of a finite family of Bregman weak relativity nonexpansive mappings in reflexive Banach spaces.  

PubMed

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

Zegeye, Habtu; Shahzad, Naseer

2014-01-01

186

Probabilistic Model of Error in Fixed-Point Arithmetic Gaussian Pyramid Antoine Meler John A. Ruiz-Hernandez James L. Crowley  

E-print Network

Probabilistic Model of Error in Fixed-Point Arithmetic Gaussian Pyramid Antoine M´eler John A. Ruiz pyramid is an important tool in computer vision and image processing. The existence of a fast algorithm with linear computational complexity makes it feasible to implement the half-octave Gaussian pyramid

Crowley, James L.

187

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

PubMed

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

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

2015-01-01

188

A Narrative of an Action Research Study in Preschool: Choice Points and Their Implications for Professional and Organisational Development  

ERIC Educational Resources Information Center

Against the background of Swedish preschool's historical and traditional functions in Swedish society, this article focuses on some of the choice points and their implications for professional and organisational development in preschool. By combining feminist pragmatism and feminist action research, some analytical points are made regarding the…

Gillberg, Claudia

2011-01-01

189

Asymptotic freedom, dimensional transmutation, and an infrared conformal fixed point for the ?-function potential in one-dimensional relativistic quantum mechanics  

NASA Astrophysics Data System (ADS)

We consider the Schrödinger equation for a relativistic point particle in an external one-dimensional ?-function potential. Using dimensional regularization, we investigate both bound and scattering states, and we obtain results that are consistent with the abstract mathematical theory of self-adjoint extensions of the pseudodifferential operator H =?p2+m2 . Interestingly, this relatively simple system is asymptotically free. In the massless limit, it undergoes dimensional transmutation and it possesses an infrared conformal fixed point. Thus it can be used to illustrate nontrivial concepts of quantum field theory in the simpler framework of relativistic quantum mechanics.

Al-Hashimi, M. H.; Shalaby, A. M.; Wiese, U.-J.

2014-06-01

190

Asymptotic Freedom, Dimensional Transmutation, and an Infra-red Conformal Fixed Point for the $\\delta$-Function Potential in 1-dimensional Relativistic Quantum Mechanics  

E-print Network

We consider the Schr\\"odinger equation for a relativistic point particle in an external 1-dimensional $\\delta$-function potential. Using dimensional regularization, we investigate both bound and scattering states, and we obtain results that are consistent with the abstract mathematical theory of self-adjoint extensions of the pseudo-differential operator $H = \\sqrt{p^2 + m^2}$. Interestingly, this relatively simple system is asymptotically free. In the massless limit, it undergoes dimensional transmutation and it possesses an infra-red conformal fixed point. Thus it can be used to illustrate non-trivial concepts of quantum field theory in the simpler framework of relativistic quantum mechanics.

Al-Hashimi, M H; Wiese, U -J

2014-01-01

191

Asymptotic Freedom, Dimensional Transmutation, and an Infra-red Conformal Fixed Point for the $?$-Function Potential in 1-dimensional Relativistic Quantum Mechanics  

E-print Network

We consider the Schr\\"odinger equation for a relativistic point particle in an external 1-dimensional $\\delta$-function potential. Using dimensional regularization, we investigate both bound and scattering states, and we obtain results that are consistent with the abstract mathematical theory of self-adjoint extensions of the pseudo-differential operator $H = \\sqrt{p^2 + m^2}$. Interestingly, this relatively simple system is asymptotically free. In the massless limit, it undergoes dimensional transmutation and it possesses an infra-red conformal fixed point. Thus it can be used to illustrate non-trivial concepts of quantum field theory in the simpler framework of relativistic quantum mechanics.

M. H. Al-Hashimi; A. M. Shalaby; U. -J. Wiese

2014-04-11

192

Corrective action investigation plan for Corrective Action Unit Number 423: Building 03-60 Underground Discharge Point, Tonopah Test Range, Nevada  

SciTech Connect

This Corrective Action Investigation Plan (CAIP) contains the environmental sample collection objectives and the criteria for conducting site investigation activities at Corrective Action Unit (CAU) Number 423, the Building 03-60 Underground Discharge Point (UDP), which is located in Area 3 at the Tonopah Test Range (TTR). The TTR, part of the Nellis Air Force Range, is approximately 225 kilometers (140 miles) northwest of Las Vegas, Nevada. CAU Number 423 is comprised of only one Corrective Action Site (CAS) which includes the Building 03-60 UDP and an associated discharge line extending from Building 03-60 to a point approximately 73 meters (240 feet) northwest. The UDP was used between approximately 1965 and 1990 to dispose of waste fluids from the Building 03-60 automotive maintenance shop. It is likely that soils surrounding the UDP have been impacted by oil, grease, cleaning supplies and solvents as well as waste motor oil and other automotive fluids released from the UDP.

NONE

1997-10-27

193

Evaluation of anti-inflammatory potential of fixed oil of Ocimum sanctum (Holybasil) and its possible mechanism of action  

Microsoft Academic Search

The fixed oil of Ocimum sanctum (Labiatae) was found to possess significant anti-inflammatory activity against carrageenan- and different other mediator-induced paw edema in rats. Significant inhibitory effect was also observed in castor oil-induced diarrhoea in rats. It also inhibited arachidonic acid and leukotriene-induced paw edema. The results of anti-inflammatory activity of Ocimum sanctum support the dual inhibition of arachidonate metabolism

Surender Singh; D. K. Majumdar; H. M. S. Rehan

1996-01-01

194

Corrective Action Investigation Plan for Corrective Action Unit No. 423: Building 03-60 Underground Discharge Point, Tonopah Test Range, Nevada  

SciTech Connect

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. 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) (FFACO, 1996). As per 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 CAU No. 423, the Building 03-60 Underground Discharge Point (UDP), which is located in Area 3 at the Tonopah Test Range (TTR). The TTR, part of the Nellis Air Force Range, is approximately 225 kilometers (km) (140 miles [mi]) northwest of Las Vegas, Nevada (Figures 1-1 and 1-2). Corrective Action Unit No. 423 is comprised of only one CAS (No. 03-02-002-0308), which includes the Building 03-60 UDP and an associated discharge line extending from Building 03-60 to a point approximately 73 meters (m) (240 feet [ft]) northwest as shown on Figure 1-3.

DOE /NV

1997-10-01

195

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

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.

Alfred N. Wickline

2004-04-01

196

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

E-print Network

agencies seeking to roll out new POU (point-of-use) and POE (point-of-entry) devices in colonias – low-income, rural and peri-urban subdivisions commonly defined by their proximity to the US-Mexico border. This study critically evaluates the role of POU...

Vandewalle, Emily Lauren

2014-04-30

197

Application of fixed scale approach to static quark free energies in quenched and 2+1 flavor lattice QCD with improved Wilson quark action  

E-print Network

Free energies between static quarks and Debye screening masses in the quark-gluon plasma are studied on the basis of Polyakov-line correlations in lattice simulations of 2+1 flavors QCD with the renormalization-group improved gluon action and the $O(a)$-improved Wilson quark action. We perform simulations at $m_{\\rm PS}/m_{\\rm V} = 0.63$ (0.74) for light (strange) flavors with lattice sizes of $32^3 \\times N_t$ with $N_t=4$--12. We adopt the fixed-scale approach, where temperature can be varied without changing the spatial volume and renormalization factor. We find that, at short distance, the free energies of static quarks in color-singlet channel converge to the static-quark potential evaluated from the Wilson-loop at zero-temperature, in accordance with the expected insensitivity of short distance physics to the temperature. At long distance, the free energies of static quarks approach to twice the single-quark free energies, implying that the interaction between static quarks is fully screened. The screening properties can be well described by the screened Coulomb form with appropriate Casimir factor at high temperature. We also discuss a limitation of the fixed-scale approach at high temperature.

Y. Maezawa; T. Umeda; S. Aoki; S. Ejiri; T. Hatsuda; K. Kanaya; H. Ohno

2012-10-24

198

Action recognition in intelligent environments using point cloud features extracted from silhouette sequences  

Microsoft Academic Search

In this paper we present our work on human action recognition in intelligent environments. We classify actions by looking at a time-sequence of silhouettes extracted from various camera images. By treating time as the third spatial dimension we generate so-called space-time shapes that contain rich information about the actions. We propose a novel approach for recognizing actions, by representing the

Radu Bogdan Rusu; Jan Bandouch; Zoltan Csaba Marton; Nico Blodow; Michael Beetz

2008-01-01

199

[Suppression of visceral pain by action of the low intensity polarized light on acupuncture antinociceptive points].  

PubMed

In experiments on mice, statistically authentic weakening of visceral pain has been shown after an action of low intensity polarized light from a device Bioptron on antinociceptive acupuncture points (AP). Pain was caused by an intraperitoneal injection of 2% acetic acid (0.1 ml/10 g). The intensity of pain was judged on duration and frequency of painful behavioral reactions (writhing, licking of abdomen), as well as on duration of sleep, eating and motor activity. In animals which immediately after injections of acetic acid were exposed to polarized light of low intensity for 10 min, applied on any of antinociceptive APs (E-36, E-43, VC-8, RP-6), the duration of painful behavioral reaction was determined to be reduced, while that of non-painful one increased. The comparison of the total duration of the writhing at control and experimental mice showed that an activation of AP E-43 induced the greatest analgesic effect (76.5%), from AP VC-8 it was 76.3%, from RP-6--46.8%, and from E-36--41.4%. We have concluded that the effect of polarized light of low intensity on APs was a convenient non-pharmacological method of treating visceral pain. PMID:14663889

Lymans'ky?, Iu P; Tamarova, Z A; Huliar, S O

2003-01-01

200

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

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

Grant Evenson

2008-09-01

201

Critical review of information relevant to the correction of the effect of chemical impurities in gases used for the realization of ITS-90 fixed points  

NASA Astrophysics Data System (ADS)

According to the Guide to the Expression of Uncertainty in Measurement (GUM) on which the expression of uncertainty in the field of metrology is based, since 1995, 'it is assumed that the results of a measurement have been corrected for all recognised significant systematic effects'. Since the International Temperature Scale of 1990 specifies that the substances used for the realization of the 'fixed points' be 'ideally pure', to fully implement the intent of the GUM corrections should be applied for any chemical impurities that affect the value of the measurand. In general, thermometrists' opinion is that significant laboratory research and more literature search are still needed for further progress towards reliable corrections. This paper, reviewing the available literature data, shows that the situation is more favourable in the case of the substances used for the realization of the Scale reference points in the range 13.8 K to 273.16 K based on the use of hydrogen, neon, oxygen and argon. The appendix reports a similar review also for nitrogen. Then the paper discusses the other conditions, physical-chemical and thermal, of the substances inside the thermometric cells, concurring with the chemical impurity effects to the overall state of knowledge of the realized triple point temperature relevant to the solution of the problem of performing the corrections.

Pavese, Franco

2009-02-01

202

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

ERIC Educational Resources Information Center

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…

Sodian, Beate; Thoermer, Claudia

2004-01-01

203

Influence of deflocculant on the isoelectric point of refractory powders: Considerations on the action of deflocculant  

NASA Technical Reports Server (NTRS)

Isoelectric point changes in suspensions of refractory materials vis-a-vis the role of deflocculants used in monolithic refractories were investigated by considering the mineral compositions and adsorbed ions in four kinds of clay. Three types of curves represented the relation between the isoelectric point and the deflocculant. The surface charge of clay particles in the suspensions became negative as a result of the deflocculant, since the isoelectric point of suspensions decreased as the deflocculant was added. The isoelectric point changes of calcined alumina were also compared with those of the clays, and a similar phenomenon was observed, except that the deflocculant dispersed the calcined alumina better than it did the clays. A simple model was used to analyze the results.

Naruse, Y.; Semba, K.; Kiwaki, S.; Mishima, M.

1983-01-01

204

Evaluation of methods for characterizing the melting curves of a high temperature cobalt-carbon fixed point to define and determine its melting temperature  

NASA Astrophysics Data System (ADS)

The future mise en pratique for the realization of the kelvin will be founded on the melting temperatures of particular metal-carbon eutectic alloys as thermodynamic temperature references. However, at the moment there is no consensus on what should be taken as the melting temperature. An ideal melting or freezing curve should be a completely flat plateau at a specific temperature. Any departure from the ideal is due to shortcomings in the realization and should be accommodated within the uncertainty budget. However, for the proposed alloy-based fixed points, melting takes place over typically some hundreds of millikelvins. Including the entire melting range within the uncertainties would lead to an unnecessarily pessimistic view of the utility of these as reference standards. Therefore, detailed analysis of the shape of the melting curve is needed to give a value associated with some identifiable aspect of the phase transition. A range of approaches are or could be used; some purely practical, determining the point of inflection (POI) of the melting curve, some attempting to extrapolate to the liquidus temperature just at the end of melting, and a method that claims to give the liquidus temperature and an impurity correction based on the analytical Scheil model of solidification that has not previously been applied to eutectic melting. The different methods have been applied to cobalt-carbon melting curves that were obtained under conditions for which the Scheil model might be valid. In the light of the findings of this study it is recommended that the POI continue to be used as a pragmatic measure of temperature but where required a specified limits approach should be used to define and determine the melting temperature.

Lowe, David; Machin, Graham

2012-06-01

205

Performance of Pt-C, CrC-CrC, CrC-C, and Ru-C Fixed Points for Thermocouple Calibrations Above 1600 C  

NASA Astrophysics Data System (ADS)

A series of high-temperature fixed points (HTFPs) Pt-C (1738 , and Ru-C (1953 ) have been constructed at the National Physical Laboratory (NPL) and the Laboratoire National de métrologie et d'Essais and Conservatoire national des arts et métiers (LNE-Cnam). These are required for the calibration of high-temperature thermocouples in the framework of work package 6 of the European Metrology Research Programme IND01 project "HiTeMS." The goal of this work package is to establish a European capability that can determine low-uncertainty reference functions of non-standard high-temperature thermocouples. For reference functions to be widely applicable, measurements must be performed by more than one institute and preferably by more than one method. Due to the high price of the ingot materials, miniature HTFP cells are used. NPL and LNE-Cnam constructed their HTFP cells with different designs; these are described here, together with the performance of the cells using both radiation thermometry and thermocouples. The melting temperature of the Ru-C cells (for thermocouple calibrations) was determined using radiation thermometry at both NPL and LNE-Cnam, and the two results are compared. The suitability of the cells for calibration of W-Re and Rh-Ir thermocouples is evaluated, and some results are presented. Some discussion is given regarding the materials challenges when calibrating Rh-Ir thermocouples up to 2000 C.

Pearce, J. V.; Elliott, C. J.; Lowe, D. H.; Failleau, G.; Deuzé, T.; Bourson, F.; Sadli, M.; Machin, G.

2014-04-01

206

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)

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.

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

2011-12-01

207

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

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.

DOE/NV

1999-05-20

208

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

PubMed

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

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

209

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

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…

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

2013-01-01

210

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

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.

Lynn Kidman

2008-10-01

211

Sequential super-stereotypy of an instinctive fixed action pattern in hyper-dopaminergic mutant mice: a model of obsessive compulsive disorder and Tourette's  

Microsoft Academic Search

BACKGROUND: Excessive sequential stereotypy of behavioral patterns (sequential super-stereotypy) in Tourette's syndrome and obsessive compulsive disorder (OCD) is thought to involve dysfunction in nigrostriatal dopamine systems. In sequential super-stereotypy, patients become trapped in overly rigid sequential patterns of action, language, or thought. Some instinctive behavioral patterns of animals, such as the syntactic grooming chain pattern of rodents, have sufficiently complex

Kent C Berridge; J Wayne Aldridge; Kimberly R Houchard; Xiaoxi Zhuang

2005-01-01

212

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

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.

NNSA /NV

2000-07-20

213

Least Action (Gravity/Free)  

NSDL National Science Digital Library

The EJS Least Action (Gravity/Free) model illustrates the principle of least action for the one dimensional motion of a free particle or a particle subject to a constant gravitational force. The simulation displays height versus time, with the path broken into equally spaced time intervals. The user can set the initial and final heights, as well as the number of time intervals to be used. The user can then adjust the intermediate heights in order to minimize the action along the path, or else allow the computer to implement an algorithm for finding the path of least action. Both the action of the current path and the least action so far observed with the current parameters are displayed. The simulation can also display average values for velocity, change in velocity, acceleration, kinetic energy, potential energy, the Lagrangian function, and total mechanical energy for each segment of the path. This helps to illustrate that the path of least action is also a path of constant acceleration (zero if there is no gravity) and constant total energy. The algorithm minimizes the action by examining three consecutive points on the path. The outer two points are held fixed and basic calculus can be used to determine the value for the middle height that minimizes the action for this segment of the path. This procedure is repeated for each segment of three points on the path, moving left to right. If this entire process is repeated over and over the path will gradually approach the path of global least action. This approach, and the entire EJS Least Action (Gravity/Free) model, was inspired by the Principle of Least Action Interactive page by Edwin Taylor and Slavomir Tuleja.

Timberlake, Todd

2012-09-05

214

Isometric group actions on Banach spaces and representations vanishing at infinity  

E-print Network

Isometric group actions on Banach spaces and representations vanishing at infinity Yves de group G = Sp(n, 1) acts properly isometrically on Lp(G) if p > 4n + 2. To prove this, we introduce isometric action of G on V , such that the linear part is a C0-representation of G, either has a fixed point

Tessera, Romain

215

Bodily Fluid Analysis of Non-Serum Samples using Point-of-Care Testing with iSTAT and Piccolo Analyzers Versus a Fixed Hospital Chemistry Analytical Platform  

PubMed Central

Introduction: Forward deployed military medical units can provide sophisticated medical care with limited resources. Point-of-Care Testing (POCT) may facilitate care and expedite diagnosis. This study assessed the accuracy of results for POCT for non-serum samples (pleural, peritoneal, and cerebrospinal fluid) using iSTAT and Piccolo hand-held devices compared with results obtained using a hospital chemistry analyzer. Methods: Pleural, peritoneal, and cerebrospinal fluids obtained during routine care were simultaneously analyzed on a Vitros 5600 automated clinical chemistry hospital analyzer, iSTAT, and Piccolo POCT devices. Results: POCT results were highly correlated with the Vitros 5600 for pleural fluid LDH, glucose, and triglycerides (TG); for peritoneal fluid bilirubin, TG, glucose, albumin, and protein; and glucose for cerebrospinal fluid. Conclusion: POCT results for non-serum samples from pleural, peritoneal, and cerebrospinal fluid correlate with standard hospital chemistry analysis. The results of this study demonstrate potential for possible new diagnostic roles for POCT in resource-limited environments. PMID:25285247

Davis, Konrad; Helman, Donald; Abadie, Jude

2014-01-01

216

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

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.

Lynn Kidman

2008-10-01

217

Methods for the assessment of correction for chemical-impurity effects and related uncertainty in ITS-90 fixed points, namely of e-H2, Ne, O2 and Ar  

NASA Astrophysics Data System (ADS)

The expression of uncertainty in the field of metrology is based, since 1993, on the Guide to the Expression of Uncertainty in Measurement. According to this, 'it is assumed that the results of a measurement have been corrected for all recognized significant systematic effects'. Since the International Temperature Scale of 1990 considers the substances used for the realization of the 'fixed points' to be ideally pure, to fully implement the intent of the GUM corrections should be applied for any chemical impurities that affect the value of the measurand. The present paper aims at reviewing an aspect that must be tackled to arrive to reliable and scientifically sound corrections: the use of an appropriate statistical method. In addition to the SIE, OME and hybrid methods recommended by the CCT, two new approaches are proposed in this paper, called one-sided OME and Average Overall Estimate (AOE). They are illustrated and their merits compared with the previous one, by applying them for the correction of the measured values of the triple-point temperature of the four gaseous substances (hydrogen, neon, oxygen and argon) used for the realization of the ITS-90 reference points in the range 13.8 K to 273.16 K. Some suggestions are drawn from the resulting evidence.

Pavese, Franco

2011-10-01

218

Thermally induced parametric instability in a back-action evading measurement of a micromechanical quadrature near the zero-point level.  

PubMed

We report the results of back-action evading experiments utilizing a tightly coupled electro-mechanical system formed by a radio frequency micromechanical resonator parametrically coupled to a NbTiN superconducting microwave resonator. Due to excess dissipation in the microwave resonator, we observe a parametric instability induced by a thermal shift of the mechanical resonance frequency. In light of these measurements, we discuss the constraints on microwave dissipation needed to perform BAE measurements far below the zero-point level. PMID:23134089

Suh, J; Shaw, M D; Leduc, H G; Weinstein, A J; Schwab, K C

2012-12-12

219

Addendum to the Closure Report for Corrective Action Unit 262: Area 25 Septic Systems and Underground Discharge Point, Nevada Test Site, Nevada  

SciTech Connect

This document constitutes an addendum to the July 2003, Closure Report for Corrective Action Unit 262: Area 25 Septic Systems and Underground Discharge Point 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.

Lynn Kidman

2008-10-01

220

A quasifront in the problem of the action of an instantaneous point impulse at the edge of a conical shell  

Microsoft Academic Search

The problem of the effect of a longitudinal point impulse at the edge of a thin conical shell is considered. The motion of the shell is described by two-dimensional equations corresponding to the second low-frequency long-wavelength approximation in the theory of elasticity. They are investigated using the matched asymptotic expansion method. The quasifront phenomenon in the theory of two-dimensional shells

Yu. D. Kaplunov; Ye. V. Nol'de

1995-01-01

221

The moment map for circle actions on sympletic manifolds  

Microsoft Academic Search

A circle action on a Kähler manifold has a moment map if and only if it has fixed points. In this note, we give examples to show that this statement is not true for a general symplectic manifold, though it does hold in dimension 4. Partially supported by NSF grant no: DMS 8504355

Dusa McDuff

1988-01-01

222

A FIXED POINT THEOREM FOR DISTRIBUTIONS  

E-print Network

size. Divide this plant into smaller plants and let them grow for a time period. Then repeat generalisation, introduced here for the first time, is the follow­ ing. Start a process with one plant of some this procedure inde­ pendent and identical, but on a different scale. Let S n be the total size of all plants

Rösler, Uwe

223

CONVERGENCE OF FIXED-POINT CONTINUATION ALGORITHMS ...  

E-print Network

Jun 18, 2009 ... Then, at iteration k, IHT will recover an approximation Xk satisfying ..... Note that in Algorithm 5, we compute an exact SVD of a smaller matrix C ..... [7] Cand`es, E. J., and Romberg, J. ?1-MAGIC: Recovery of sparse signals via ...

2010-12-29

224

Fixed point theorems in ultrametric spaces  

E-print Network

y. The set X S(x, 2) is also open and closed and contains y, Teen 2 (X S ' 2 ) d S( ' 2 U (X S( ' 2 Hence, X i. s totally disconnected. a Lemma 1. 8. Let (X, d) be a compact ultrametric space. For each x s X, let R(x) = (d(x, y) : y c X). Then 0... The following example show that completeness cannot be omitted from the hypothesis in Theorem 2. 2. ~Exam le 2. 8. In the space Q , let f : Q ~ Q be defined by f(x) . Suppose there exists x c Q such that f(x) = x. 3 +1 3 3 Then x is necessarily positive...

Fullbright, Steven Edward

2012-06-07

225

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)

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).

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

2014-01-01

226

Hamiltonian Analysis of $R + T^2$ Action  

E-print Network

We study a gravitational action which is a linear combination of the Hilbert-Palatini term and a term quadratic in torsion and possessing local Poincare invariance. Although this action yields the same equations of motion as General Relativity, the detailed Hamiltonian analysis without gauge fixing reveals some new points never shown in the Hilbert-Palatini formalism. These include that an additional term containing torsion appears in the spatial diffeomorphism constraint and that the primary second-class constraints have to be imposed in a manner different from that in the Hilbert-Palatini case. These results may provide valuable lessons for further study of Hamiltonian systems with torsion.

Jian Yang; Kinjal Banerjee; Yongge Ma

2012-04-03

227

Hamiltonian Analysis of $R + T^2$ Action  

E-print Network

We study a gravitational action which is a linear combination of the Hilbert-Palatini term and a term quadratic in torsion and possessing local Poincare invariance. Although this action yields the same equations of motion as General Relativity, the detailed Hamiltonian analysis without gauge fixing reveals some new points never shown in the Hilbert-Palatini formalism. These include that an additional term containing torsion appears in the spatial diffeomorphism constraint and that the primary second-class constraints have to be imposed in a manner different from that in the Hilbert-Palatini case. These results may provide valuable lessons for further study of Hamiltonian systems with torsion.

Yang, Jian; Ma, Yongge

2012-01-01

228

Full and partial gauge fixing  

SciTech Connect

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.

Shirzad, A. [Institute for Studies in Theoretical Physics and Mathematics, P. O. Box 5531, Tehran 19395 (Iran, Islamic Republic of) and Department of Physics, Isfahan University of Technology, Isfahan (Iran, Islamic Republic of)

2007-08-15

229

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

Abstract 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; lungs 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

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

2015-01-01

230

Association between Nitrogen-fixing and Cellulose-decomposing Microorganisms  

Microsoft Academic Search

IT is a well-known fact that by the combined action of cellulose-decomposing and nitrogen-fixing bacteria in crude culture, elementary nitrogen may be fixed in quantities of as much as 10-12 mgm. per gm. of decomposed cellulose. So far, only Vartiovaara1 seems to have given indisputable proof of nitrogen-fixation in combined cultures of one nitrogen-fixing and one cellulose-decomposing organism (Azotobacter; Clostridium

H. L. Jensen; R. J. Swaby

1941-01-01

231

U Fix It  

NSDL National Science Digital Library

Ziff needs you to help him fix his buildings! With your tool bag, you will fix windows, doors, and roofs. Sounds easy right? It may not be as easy as you may think. You will need to use what you have learned in math class to make new ones that fit just right. You will get your own Cyberchase Master Builder certificate when the job is done!

2008-01-01

232

Tumor Systems Need to be Rendered Usable for a New Action-Theoretical Abstraction: The Starting Point for Novel Therapeutic Options  

Microsoft Academic Search

\\u000a A tumor system not only consists of diverse cell types but also comprises all ­components of action insofar that these components\\u000a are oriented in terms of diverse cell types. Thus, it is necessary to decode paradox situations of cellular rationalization,\\u000a deformation, and communication processes or, in other words, to uncover inconsistencies within tumor cell compartments or\\u000a distinct topologies of aggregated

Albrecht Reichle

233

Fixed mount wavefront sensor  

DOEpatents

A rigid mount and method of mounting for a wavefront sensor. A wavefront dissector, such as a lenslet array, is rigidly mounted at a fixed distance relative to an imager, such as a CCD camera, without need for a relay imaging lens therebetween.

Neal, Daniel R. (Tijeras, NM)

2000-01-01

234

Procedures for Behavioral Experiments in Head-Fixed Mice  

PubMed Central

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

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

235

When is a group action determined by its orbit structure?  

Microsoft Academic Search

We present a simple approach to questions of topological orbit equivalence for actions of countable groups. For example, for any action of a countable group GG on a topological manifold where the fixed sets for any element are contained in codimension two submanifolds, every orbit equivalence is equivariant. Even in the presence of larger fixed sets, for actions preserving rigid

David Fisher; Kevin Whyte

2003-01-01

236

Sensorimotor adaptation modifies action effects on sensory binding.  

PubMed

Previous studies have shown that performing a motor action toward a target decreases the perceptual asynchrony observed in a temporal order judgment (TOJ) of a change in the target's visual attributes. We examined the temporal limit of this effect and whether this temporal limit can be extended through sensorimotor adaptation. Participants performed a TOJ task related to changes of the position and color of a visual stimulus in a perceptual and a motor task. A fixed change (color or position) occurred 250 or 500 ms following an auditory cue (perceptual task) or the end of a manual reaching action (motor task), whereas the variable change (position or color) occurred randomly within a time window of ±200 ms locked to the fixed change. The points of subjective simultaneity (PSSs) revealed that performing a voluntary action decreased the temporal asynchrony observed in the perceptual task, but only in the 250-ms delay condition. In Experiment 2, the fixed change occurred 1 s after either an auditory cue or the end of a manual reaching action, and the variable change occurred either simultaneously (new sensorimotor contingencies, 60 % of trials) or within a time window of ±200 ms (40 % of trials). The PSSs revealed that temporal asynchrony decreased in the motor task, but only after adaptation to the 1-s delay. Taken together, these data show that voluntary motor action affects the temporal binding of visual attributes for a period of less than 500 ms after the end of the action. Sensorimotor adaptation can nevertheless extend this time interval, at least up to 1 s. PMID:25280521

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

2014-10-01

237

Fixed Resistor Placement  

NSDL National Science Digital Library

Flash Player 6 or greater is required to view this website. You are a student worker in the ACME Community College electronics department. Students have left 50 fixed resistors on the lab bench. Your supervisor has asked you to return these resistors to the proper drawers and she has given you 10 minutes to complete the task. Enter your name and click the Start button. A fixed resistor will be displayed. Click on and drag the resistor to the proper drawer. If placed in the correct drawer, a green light will be displayed. If placed incorrectly, a red light will be displayed and the resistor will be displayed at the bottom of the screen.

238

Phase structure of the Higgs-Yukawa systems with chirally invariant lattice fermion actions  

E-print Network

We develop analytical technique for examining phase structure of $Z_2$, $U(1)$, and $SU(2)$ lattice Higgs-Yukawa systems with radially frozen Higgs fields and chirally invariant lattice fermion actions. The method is based on variational mean field approximation. We analyse phase diagrams of such systems with different forms of lattice fermion actions and demonstrate that it crucially depends both on the symmetry group and on the form of the action. We discuss location in the diagrams of possible non-trivial fixed points relevant to continuum physics, and argue that the candidates can exist only in $Z_2$ system with SLAC action and $U(1)$ systems with naive and SLAC actions. [Note: By a product, missing term in Eq. (3.5) of hep-lat/9309010 is reconstructed, that, however, affects only the result of Sect. 4.3 (Fig. 3) of that reference (cf. Fig. 2(c) of this paper).

S. Tominaga; S. V. Zenkin

1994-03-04

239

FixBag : A Fixpoint Calculator for Quantified Bag Constraints  

E-print Network

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

Chin, Wei Ngan

240

Action and entanglement in gravity and field theory.  

PubMed

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

Neiman, Yasha

2013-12-27

241

47 CFR 78.108 - Minimum path lengths for fixed links.  

Code of Federal Regulations, 2010 CFR

...COMMISSION (CONTINUED) BROADCAST RADIO SERVICES CABLE TELEVISION RELAY SERVICE Technical Regulations § 78.108 Minimum path lengths for fixed links. (a) The distance between end points of a fixed link must equal or exceed the...

2010-10-01

242

41. Detail showing meeting of two fixed land span segments, ...  

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

41. Detail showing meeting of two fixed land span segments, bridge land span at left, viaduct at right. VIEW NORTH - Broadway Bridge, Spanning Foundry Street, MBTA Yard, Fort Point Channel, & Lehigh Street, Boston, Suffolk County, MA

243

Fixed target facility at the SSC  

SciTech Connect

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.

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

1985-01-01

244

Extracting hadron masses from fixed topology simulations  

E-print Network

Lattice QCD simulations tend to become stuck in a single topological sector at fine lattice spacing or when using chirally symmetric overlap quarks. In such cases physical observables differ from their full QCD counterparts by finite volume corrections. These systematic errors need to be understood on a quantitative level and possibly be removed. In this paper we extend an existing relation from the literature between two-point correlation functions at fixed and the corresponding hadron masses at unfixed topology by calculating all terms proportional to $1/V^2$ and $1/V^3$, where $V$ is the spacetime volume. Since parity is not a symmetry at fixed topology, parity mixing is comprehensively discussed. In the second part of this work we apply our equations to a simple model, quantum mechanics on a circle both for a free particle and for a square-well potential, where we demonstrate in detail, how to extract physically meaningful masses from computations or simulations at fixed topology.

Arthur Dromard; Marc Wagner

2014-07-17

245

Turning Knowledge Into Action at the Point-of-Care: The Collective Experience of Nurses Facilitating the Implementation of Evidence-Based Practice  

PubMed Central

Background: Facilitation is considered a way of enabling clinicians to implement evidence into practice by problem solving and providing support. Practice development is a well-established movement in the United Kingdom that incorporates the use of facilitators, but in Canada, the role is more obtuse. Few investigations have observed the process of facilitation as described by individuals experienced in guideline implementation in North America. AimTo describe the tacit knowledge regarding facilitation embedded in the experiences of nurses implementing evidence into practice. Methods: Twenty nurses from across Canada were purposively selected to attend an interactive knowledge translation symposium to examine what has worked and what has not in implementing evidence in practice. This study is an additional in-depth analysis of data collected at the symposium that focuses on facilitation as an intervention to enhance evidence uptake. Critical incident technique was used to elicit examples to examine the nurses’ facilitation experiences. Participants shared their experiences with one another and completed initial data analysis and coding collaboratively. The data were further thematically analyzed using the qualitative inductive approach of constant comparison. Results: A number of factors emerged at various levels associated with the successes and failures of participants’ efforts to facilitate evidence-based practice. Successful implementation related to: (a) focus on a priority issue, (b) relevant evidence, (c) development of strategic partnerships, (d) the use of multiple strategies to effect change, and (e) facilitator characteristics and approach. Negative factors influencing the process were: (a) poor engagement or ownership, (b) resource deficits, (c) conflict, (d) contextual issues, and (e) lack of evaluation and sustainability. Conclusions: Factors at the individual, environmental, organizational, and cultural level influence facilitation of evidence-based practice in real situations at the point-of-care. With a greater understanding of factors contributing to successful or unsuccessful facilitation, future research should focus on analyzing facilitation interventions tailored to address barriers and enhance facilitators of evidence uptake. PMID:23796066

Dogherty, Elizabeth J; Harrison, Margaret B; Graham, Ian D; Vandyk, Amanda Digel; Keeping-Burke, Lisa

2013-01-01

246

Acidosis environment promotes osteoclast formation by acting on the last phase of preosteoclast differentiation: a study to elucidate the action points of acidosis and search for putative target molecules.  

PubMed

Acidosis promoted tartaric acid-resistant acid phosphatase-positive multinuclear cell (TRAP+MNC) or osteoclast formation. Large osteoclast or TRAP+LMNC formation was observed far more in an acidosis environment than in a physiologically neutral environment. One of the major action points of acidosis was determined to be located in the last phase of preosteoclast differentiation using a co-culture system and a soluble RANKL-dependent bone marrow cell culture system. On-going osteoclast formation in an acidosis environment markedly deteriorated when the medium was replaced with physiologically neutral medium within the first 6h; however, bone marrow cells previously stimulated in an acidosis environment for 9h differentiated into TRAP+LMNC in pH 7.4 medium. Messenger RNA (mRNA) expression levels of DC-STAMP, a key molecule in cell fusion, and NFATc1 did not increase in the acidosis environment compared with those under physiologically neutral conditions. Ruthenium red, a general TRP antagonist, deteriorated acidosis-promoted TRAP+LMNC formation. 4-Alpha-PDD, a TRPV4-specific agonist, added in the last 21 h of preosteoclast differentiation, potentiated TRAP+LMNC formation in a mild acidosis environment, showing synergism between TRPV4 activation and acidosis. RN1734, a TRPV4-specific antagonist, partly inhibited acidosis-promoted TRAP+LMNC formation. We thus narrowed down the major action points of acidosis in osteoclast formation and elucidated the characteristics of this system in detail. Our results show that acidosis effectively uses TRPV4 to drive large-scale cell fusion and also utilizes systems independently of TRPV4. PMID:21575626

Kato, Kohtaro; Morita, Ikuo

2011-08-01

247

Fixed sagittal plane imbalance.  

PubMed

Study Design?Literature review. Objective?To discuss the evaluation and management of fixed sagittal plane imbalance. Methods?A comprehensive literature review was performed on the preoperative evaluation of patients with sagittal plane malalignment, as well as the surgical strategies to address sagittal plane deformity. Results?Sagittal plane imbalance is often caused by de novo scoliosis or iatrogenic flat back deformity. Understanding the etiology and magnitude of sagittal malalignment is crucial in realignment planning. Objective parameters have been developed to guide surgeons in determining how much correction is needed to achieve favorable outcomes. Currently, the goals of surgery are to restore a sagittal vertical axis?Fixed sagittal malalignment often requires complex reconstructive procedures that include osteotomy correction. Reestablishing harmonious spinopelvic alignment is associated with significant improvement in health-related quality-of-life outcome measures and patient satisfaction. PMID:25396111

Savage, Jason W; Patel, Alpesh A

2014-12-01

248

Colligative Properties of Solutions: I. Fixed Concentrations  

Microsoft Academic Search

Using the formalism of rigorous statistical mechanics, we study the phenomena of phase separation and freezing-point depression upon freezing of solutions. Specifically, we devise an Ising-based model of a solvent--solute system and show that, in the ensemble with a fixed amount of solute, a macroscopic phase separation occurs in an interval of values of the chemical potential of the solvent.

Kenneth S. Alexander; Marek Biskup; Lincoln Chayes

249

Colligative Properties of Solutions: I. Fixed Concentrations  

Microsoft Academic Search

Using the formalism of rigorous statistical mechanics, we study the phenomena of phase separation and freezing-point depression upon freezing of solutions. Specifically, we devise an Ising-based model of a solvent--solute system and show that, in the ensemble with a fixed amount of solute, a macroscopic phase separation occurs in an interval of values of the chemical potential of the solvent.

Kenneth S. Alexander; Marek Biskup; Lincoln Chayes

2005-01-01

250

Colligative Properties of Solutions: I. Fixed Concentrations  

NASA Astrophysics Data System (ADS)

Using the formalism of rigorous statistical mechanics, we study the phenomena of phase separation and freezing-point depression upon freezing of solutions. Specifically, we devise an Ising-based model of a solvent--solute system and show that, in the ensemble with a fixed amount of solute, a macroscopic phase separation occurs in an interval of values of the chemical potential of the solvent. The boundaries of the phase separation domain in the phase diagram are characterized and shown to asymptotically agree with the formulas used in heuristic analyses of freezing-point depression. The limit of infinitesimal concentrations is described in a subsequent paper.

Alexander, Kenneth S.; Biskup, Marek; Chayes, Lincoln

2005-05-01

251

Choosing Actions  

PubMed Central

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

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

2013-01-01

252

The Problem of Two Fixed Centers: Bifurcations, Actions, Monodromy  

E-print Network

for a discussion of the restricted three-body problem [13]. In molecular physics the two centers are atomic nuclei relative strength of the two centers and considers separately the planar and the three-dimensional problems constants. The interesting objects are the critical values of this mapping, i. e., its bifurcation diagram

253

Fixed points and variational principles with applications to capability ...  

E-print Network

models by using a recent variational rationality approach to behavioral sciences. Keywords: ..... compatible with positive scalar multiplication. Consider next a ...... Intervention in School and Clinic, 31, 285–289. [2] Appadurai, A. ... tor optimization with variable structures, Journal of Optimization Theory and Applications, DOI.

2014-03-27

254

Examples involving shrinking conditions of fixed point theorems  

E-print Network

Douglas Andrew Sharp was 'corn in Seton Hosp' tal in Austin, Texas on July lo? log~i 5; she proud pm =nts were Jack teston and Zrnestine Sharp. He became a resident of Grand. Prairie in lo4~o. He was a produc L of Grand Prairie publ' c schools. In I...

Sharp, Douglas Andrew

1970-01-01

255

Simple Process Equations, Fixed-Point Methods, and Chaos  

E-print Network

's method exhibit all of the rich structure of chaos (period doubling, aperiodicity, fractal basin Engineering Clarkson University Potsdarn, NY 13699 Introduction Process simulation has been an important part tripling, fractal basin boundaries, Julia sets, and related properties) on even the simplest nonlinear

Lucia, Angelo

256

Action selection and action value in frontal-striatal circuits.  

PubMed

The role that frontal-striatal circuits play in normal behavior remains unclear. Two of the leading hypotheses suggest that these circuits are important for action selection or reinforcement learning. To examine these hypotheses, we carried out an experiment in which monkeys had to select actions in two different task conditions. In the first (random) condition, actions were selected on the basis of perceptual inference. In the second (fixed) condition, the animals used reinforcement from previous trials to select actions. Examination of neural activity showed that the representation of the selected action was stronger in lateral prefrontal cortex (lPFC), and occurred earlier in the lPFC than it did in the dorsal striatum (dSTR). In contrast to this, the representation of action values, in both the random and fixed conditions, was stronger in the dSTR. Thus, the dSTR contains an enriched representation of action value, but it followed frontal cortex in action selection. PMID:22681697

Seo, Moonsang; Lee, Eunjeong; Averbeck, Bruno B

2012-06-01

257

Action selection and action value in frontal-striatal circuits  

PubMed Central

Summary The role that frontal-striatal circuits play in normal behavior remains unclear. Two of the leading hypotheses suggest that these circuits are important for action selection or reinforcement learning. To examine these hypotheses we carried out an experiment in which monkeys had to select actions in two different task conditions. In the first (random) condition actions were selected on the basis of perceptual inference. In the second (fixed) condition the animals used reinforcement from previous trials to select actions. Examination of neural activity showed that the representation of the selected action was stronger in lateral prefrontal cortex (lPFC), and occurred earlier in the lPFC than it did in the dorsal striatum (dSTR). In contrast to this, the representation of action values, in both the random and fixed conditions was stronger in the dSTR. Thus, the dSTR contains an enriched representation of action value, but it followed frontal cortex in action selection. PMID:22681697

Seo, Moonsang; Lee, Eunjeong; Averbeck, Bruno B.

2012-01-01

258

Higher derivative corrections to O-plane actions: NS-NS sector  

NASA Astrophysics Data System (ADS)

We classify all possible two- and four-derivative couplings of bulk NS-NS sector fields to a single O p-plane which are compatible with diffeomorphism invariance and B-field gauge invariance. This is applicable to type IIA or IIB superstrings or to the bosonic string. We then consider this general action in various classes of backgrounds that admit a U(1) isometry and determine the constraints on the couplings from consistency with T-duality. We show that this consistency requires the two-derivative action to vanish, and the entire non-linear four-derivative action is fixed up to one overall constant which can be determined by comparison with a two-point scattering amplitude. The resulting action is consistent with all previously computed couplings.

Robbins, Daniel; Wang, Zhao

2014-05-01

259

Random Coincidence Point Theorem in Frechet Spaces with Applications  

E-print Network

Random Coincidence Point Theorem in Fr´echet Spaces with Applications Abdul Rahim Khan Department in the setup of Fr´echet spaces. As applications, we obtained random fixed point and best approximation results: Random fixed point, Random coincidence point, *-nonexpansive map, Opial's condition, Fr´echet space. 1

Khan, Abdul Rahim

260

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

E-print Network

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

Nichols, Kyle K.

261

Liminality as Thought and Action  

ERIC Educational Resources Information Center

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…

Emmanuel, Donna T.

2011-01-01

262

The Fix Issue 9  

E-print Network

,k in war-pa int, I must admit ... HARD DAY ' S NIGHT. I would advi,e OMS never to take much notice of maga::ine que,tionaire,. But as a trigqer t o prompt him to a,k ,ome questions of hi' own - neat! BALANCE DUE I hope i, the beginninq of a se rie... ... ... n's Road" by Jennet Mo rgan. Interesting. Now I ' m wa iting for more ... MORE ... MORE... The waiting g ... me 13 a real killer, folk:l. "A Hard Day ' s Niqht" by Leah Starsky. This one was very Short and to the point. But what took Star...

Multiple Contributors

1990-01-01

263

Fixed site hydrogen storage. I - Applications impact  

NASA Astrophysics Data System (ADS)

The potential applications and requirements for fixed site storage in a scenario of wide spread hydrogen use are examined and quantified. An envisioned hydrogen production/distribution/end-use cycle is scrutinized to identify the storage needs for both continuous and intermittent sources including solar. The most pressing need for storage is found to be at the distribution point, in concurrence with current natural gas practice. Caverns and similar underground storage techniques are shown to be the most promising modes due to their low cost relative to all other options examined. Since a large volume of natural gas storage is presently in service, a pressing need to develop fixed site hydrogen storage technology (beyond the conversion of this underground storage to hydrogen) has not been identified.

Iannucci, J. J.; Robinson, S. L.

264

Total effective dose equivalent associated with fixed uranium surface contamination  

SciTech Connect

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.

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

1997-04-01

265

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

Code of Federal Regulations, 2013 CFR

...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...

2013-10-01

266

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

Code of Federal Regulations, 2014 CFR

...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...

2014-10-01

267

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

Code of Federal Regulations, 2011 CFR

...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...

2011-10-01

268

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

Code of Federal Regulations, 2010 CFR

...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...

2010-10-01

269

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

Code of Federal Regulations, 2012 CFR

...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...

2012-10-01

270

Fixed drug eruption to propofol.  

PubMed

We present a case of fixed drug eruption to propofol following a series of sedations of a patient for a number of day case procedures. The patient experienced oedema and blistering of his penis, increasing in severity and duration following each subsequent exposure. The diagnosis was confirmed by punch biopsy following an intravenous challenge test with propofol. Whilst reports of fixed drug eruptions to anaesthetic induction agents are uncommon, a number of drugs used commonly by anaesthetists are known triggers. We discuss fixed drug eruptions in relation to anaesthetic practice, aiming to raise awareness of this adverse drug reaction. PMID:25342411

Allchurch, L G V; Crilly, H

2014-11-01

271

Fixing the Pole in the Pyramid  

E-print Network

We revisit the problem of the hidden sector Landau pole in the Pyramid Scheme. There is a fixed line in the plane of hidden sector gauge coupling and a Yukawa coupling between the trianon fields. We postulate that the couplings flow to this line, at a point where the hidden sector gauge coupling is close to the strong coupling edge of its perturbative regime. Below the masses of the heavier trianons, the model quickly flows to a confining N_F=N_C=3 supersymmetric gauge theory, as required by phenomenological considerations. We study possible discrete R-symmetries, which guarantee, among other things, that the basin of attraction of the fixed line has full co-dimension in the space of R-allowed couplings. The Yukawa couplings required to get the fixed line violate the pyrma-baryon symmetries we invoked in previous work to find a dark matter candidate. Omitting one of them, we have a dark matter candidate, and an acceptable RG flow down from the unification scale, if the confinement scale of the hidden sector group is lowered from 5 to 2 TeV.

Tom Banks; Jean-François Fortin; Scott Kathrein

2009-12-07

272

Multiprocessing system for performing floating point arithmetic operations  

SciTech Connect

This patent describes a data processing system. It comprises: a fixed point arithmetic processor means for performing fixed point arithmetic operations and including control means for decoding a floating point arithmetic instruction specifying a floating point arithmetic operation, and an addressing means for computing addresses for floating point data for the floating point operation from a memory means. The memory means for storing data and including means for receiving the addresses from the fixed point arithmetic processor means and providing the floating point data to a floating point arithmetic processor means; and the floating point arithmetic processor means for performing floating point arithmetic operations and including control means for decoding the floating point instruction and performing the specified floating point arithmetic operation upon the floating point data from the memory means.

Nguyenphu, M.; Thatcher, L.E.

1990-10-02

273

Nonperturbative QCD, gauge-fixing, Gribov copies, and the lattice  

E-print Network

Perturbative QCD uses the Faddeev-Popov gauge-fixing procedure, which leads to ghosts and the local BRST invariance of the gauge-fixed perturbative QCD action. In the asymptotic regime, where perturbative QCD is relevant, Gribov copies can be neglected. In the nonperturbative regime, one must adopt either a nonlocal Gribov-copy free gauge (e.g., Laplacian gauge) or attempt to maintain local BRST invariance at the expense of admitting Gribov copies. These issues are explored. In addition, we discuss the relationship between recent Dyson-Schwinger based model calculations of the infrared behavior of QCD Green's functions and the lattice calculation of these quantities.

Anthony G. Williams

2003-04-07

274

Has the bug really been fixed?  

Microsoft Academic Search

Software has bugs, and fixing those bugs pervades the software engineering process. It is folklore that bug fixes are often buggy themselves, resulting in bad fixes, either failing to fix a bug or creating new bugs. To confirm this folklore, we explored bug databases of the Ant, AspectJ, and Rhino projects, and found that bad fixes comprise as much as

Zhongxian Gu; Earl T. Barr; David J. Hamilton; Zhendong Su

2010-01-01

275

Irregular mixing due to a vortex pair interacting with a fixed vortex  

NASA Astrophysics Data System (ADS)

The paper examines scalar advection caused by a point-vortex pair encountering a fixed point vortex in a uniform flow. The interaction produces two types of vortex motion. First is unbounded as the pair moves unrestrictedly after encountering the fixed vortex. The scalar exchanging between the pair's bubble and fixed vortex's neighbourhood is numerically estimated. Second is bounded as the pair's vortices periodically oscillate about the fixed vortex. The pair's periodic motion perturbs scalar motion causing a portion of scalar trajectories to manifest chaotic behaviour. We analyse scalar transport using Poincaré sections, which reveal regular and chaotic transport regions.

Ryzhov, E. A.

2014-10-01

276

Evidence of the big fix  

NASA Astrophysics Data System (ADS)

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.

Hamada, Yuta; Kawai, Hikaru; Kawana, Kiyoharu

2014-06-01

277

Evidence of the Big Fix  

E-print Network

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 $v_{h}$. 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 $v_{h}$. 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 low in our case.

Yuta Hamada; Hikaru Kawai; Kiyoharu Kawana

2014-05-06

278

Mac FixIt Guides  

NSDL National Science Digital Library

The iFixIt guides are extremely helpful to computer repair technicians who would like to be able to fix Apple brand computers as well as PCs. The guides included on the site are mainly dedicated to Apple laptops, including MacBooks, PowerBooks, and iBooks, but also include a few guides pertaining to the Mac Mini. There are numerous guides to choose from, all organized by computer type, computer specifications, and what the repairperson would like to accomplish. The guides are extremely easy to follow and contain detailed pictures and diagrams, which are very helpful. Most of the guides are also downloadable. The guides include lists of tools and links to purchase the tools if the user doesn�t have them. All of the information on iFixIt is free and no login is required.

2006-12-31

279

On fixing and being fixed: Metaphors in psychotherapy  

Microsoft Academic Search

The term “to fix” is explored with its multiplicity of meanings, and its relevance to such clinical issues as transference and resistance are discussed along with positive and negative denotations and connotations of the term. Cases are also presented to illustrate both positive and negative uses.

Saralea E. Chazan

1990-01-01

280

Fixed Schedules Can Support 21st-Century Skills  

ERIC Educational Resources Information Center

The common belief among school librarians is that a flexibly scheduled school library program as opposed to a fixed schedule program is the best choice. After all, there are distinct advantages to the flexible program: students are served at the point of need, skills are not taught in isolation, and collaborative lessons are developed with…

Formanack, Gail; Pietsch, Laura

2011-01-01

281

Mass action  

NSDL National Science Digital Library

In the first part of this video, we derive the law of mass action from one example of a picture of molecular collisions. For this course, we use the "law of mass action" to refer to an idea that chemical reaction kinetic rates can be expressed using products of the abundances of reactants raised to exponents. Studying cooperativity and Hill functions in the second part of the video allows us to investigate a simple example of bistability in the third video segment.

2013-06-21

282

Enzyme Action  

NSDL National Science Digital Library

In this activity that can be used as a lab or demonstration, learners use Lactaid® and lactose to demonstrate the concept of enzyme action. Learners test a drop of milk and Lactaid® for the presence of glucose using glucose test paper. Learners also discover the color range of glucose test paper readings. In addition, learners construct paper models to help visualize enzyme action.

Crumlish, Jane

2009-01-01

283

Action perception predicts action performance  

PubMed Central

Everyday action impairments often are observed in demented older adults, and they are common potential barriers to functional independence. We evaluated whether the ability to segment and efficiently encode activities is related to the ability to execute activities. Further, we evaluated whether brain regions important for segmentation also were important for action performance. Cognitively healthy older adults and those with very mild or mild dementia of the Alzheimer's type watched and segmented movies of everyday activities and then completed the Naturalistic Action Test. Structural MRI was used to measure volume in the dorsolateral prefrontal cortex (DLPFC), medial temporal lobes (MTL), posterior cortex, and anterior cingulate cortex (ACC). Dementia status and the ability to segment everyday activities strongly predicted naturalistic action performance, and MTL volume largely accounted for this relationship. In addition, the current results supported the Omission-Commission Model: Different cognitive and neurological mechanisms predicted different types of action error. Segmentation, dementia severity, and MTL volume predicted everyday omission errors, DLPFC volume predicted commission errors, and ACC volume predicted action additions. These findings suggest that event segmentation may be critical for effective action production, and that the segmentation and production of activities may recruit the same event representation system. PMID:23851113

Bailey, Heather R.; Kurby, Christopher A.; Giovannetti, Tania; Zacks, Jeffrey M.

2013-01-01

284

Fixed Costs and Hours Constraints  

ERIC Educational Resources Information Center

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…

Johnson, William R.

2011-01-01

285

Curricular Guidelines in Fixed Prosthodontics.  

ERIC Educational Resources Information Center

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)

Brindsen, Gilbert; And Others

1984-01-01

286

Identifying Linux bug fixing patches  

Microsoft Academic Search

In the evolution of an operating system there is a continuing tension between the need to develop and test new features, and the need to provide a stable and secure execution environment to users. A compromise, adopted by the developers of the Linux kernel, is to release new versions, including bug fixes and new features, frequently, while maintaining some older

Yuan Tian; Julia Lawall; David Lo

2012-01-01

287

Fixed drug eruption to tartrazine.  

PubMed

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

Orchard, D C; Varigos, G A

1997-11-01

288

SFT Action for Separated D-branes  

E-print Network

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.

Longton, Matheson

2012-01-01

289

SFT Action for Separated D-branes  

E-print Network

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.

Matheson Longton

2012-03-20

290

Renormalized Action Integrals in Classical Electrodynamics  

Microsoft Academic Search

Bergmann and Rohrlich have presented classical action integrals in electrodynamics which lead to the renormalized relativistic Lorentz-Dirac equations for a point charge; the relationship between the two approaches is examined. In neither case can the action integral be obtained by transformation from an unrenormalized form. For Bergmann's form, mass renormalization of the equations of motion and of the action integral

Melvin Schwartz

1965-01-01

291

Final consolidated action plan to Tiger Team  

SciTech Connect

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.

Not Available

1992-10-01

292

Partial Gauge Fixing and Equivariant Cohomology  

E-print Network

Given a gauge theory with gauge group G, it is sometimes useful to find an equivalent formulation in terms of a non-trivial gauge subgroup H of G. This amounts to fixing the gauge partially from G down to H. We study this problem systematically, both from the algebraic and the path integral points of view. We find that the usual BRST cohomology must be replaced by an equivariant version and that the ghost Lagrangian must always include quartic ghost terms, even at tree level. Both the Cartan and Weil models for equivariant cohomology play a role and find natural interpretations within the physics framework. Applications include the construction of D-brane models of emergent space, the 't Hooft's Abelian projection scenario in quantum chromodynamics and the formulation of the low energy effective theories of grand unified models.

Frank Ferrari

2013-08-30

293

Variable delivery, fixed displacement pump  

DOEpatents

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.

Sommars, Mark F. (Sparland, IL)

2001-01-01

294

Fixed target flammable gas upgrades  

SciTech Connect

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.

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

1996-12-01

295

Covert Action  

Microsoft Academic Search

In what is now seen as the twilight of the Cold War, James E. Baker and I published a book entitled Regulating Covert Action: Practices, Contexts, and Policies of Covert Coercion Abroad in International and American Law. A variety of covert activities were commonly being conducted in international politics in the use of military, economic, diplomatic, and propaganda instruments. Even

W. Michael Reisman

1995-01-01

296

Which bug should I fix: helping new developers onboard a new project  

Microsoft Academic Search

A typical entry point for new developers in an open source project is to contribute a bug fix. However, finding an appropriate bug and an appropriate fix for that bug requires a good understanding of the project, which is nontrivial. Here, we extend Tesseract - an interactive project exploration environment - to allow new developers to search over bug descriptions

Jianguo Wang; Anita Sarma

2011-01-01

297

A uniqueness theorem for two-point boundary value problems  

Microsoft Academic Search

We prove a uniqueness theorem for solutions of two-point boundary value problems, which says that when the nonlinearity is sublinear and Lipschitzian, and one of the boundary values is fixed, then for sufficiently large values of the other boundary value there is a unique solution of the problem. The proof is based on the Banach's fixed-point theorem, and the argument

Guy Katriel

2000-01-01

298

Cardiotonic action of two tannins  

PubMed Central

A tannin isolated from Paullinia pinnata Linn., and tannic acid, have cardiotonic actions on the isolated perfused frog heart. Paullinia tannin is more firmly “fixed” than tannic acid. Tannin solutions contain peroxide, but the cardiotonic action is not dependent on this, since drugs believed to prevent peroxide formation, and sodium pyruvate which destroys peroxides, do not prevent the cardiotonic action. Maximal stimulation by tannin greatly reduces subsequent stimulation by ouabain. If calcium is omitted from the Ringer solution tannins cannot stimulate the heart. In this respect they differ from ouabain. However, the ouabain stimulation can be prevented by prior perfusion with tannin. It is suggested that the antagonism between tannin and ouabain is due to the former preventing ouabain from reaching its receptor sites, and that tannin stimulation is dependent on the formation of a calcium-tannin complex at the heart surface. In the isolated perfused mammalian heart preparation tannins increase diastolic tonus and coronary flow. PMID:13873207

Broadbent, J. L.

1962-01-01

299

Analysis of fixed target collisions with the STAR detector  

NASA Astrophysics Data System (ADS)

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.

Haag, Brooke

2013-04-01

300

Analysis of fixed target collisions with the STAR detector  

NASA Astrophysics Data System (ADS)

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.

Haag, Brooke

2012-11-01

301

Citizen's actions  

NASA Technical Reports Server (NTRS)

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.

1975-01-01

302

Practical Action  

NSDL National Science Digital Library

Founded over 40 years ago by an economist, Practical Action's aim is to help impoverished people "use technology to challenge poverty", to gain "access to technical options and knowledge", and "influence the social, economic and institutional systems for innovation and use of technology." The "Downloads" tab has a link to "Practical Answers" that cover almost two dozen themes and lets users browse the extensive library, submit technical questions to expert, and it also provides users with a section entitled "Share" which documents peoples' experience with Practical Action. Visitors will also find the "Featured Articles" section of the Downloads useful and full of such practical information as "Build Your Own Tippy Tap", for hand washing after toileting and a "Solar Voltaic System Design Info Sheet" that covers electrical design issues. Back on the homepage, visitors will find links to their social networking, e-newsletter, and the latest from their series of blogs.

303

A high precision telescope pointing system  

Microsoft Academic Search

A novel method of telescope pointing has been developed based on He-Ne laser interferometric measurements of mirror position. This technique has been applied to a Pfund-type telescope, which consists of a fixed parabolic mirror illuminated by a flat mirror which rotates in altitude and azimuth. If the parabolic mirror is stationary, the angle of pointing depends only on the change

W. C. Danchi; A. Arthur; R. Fulton; M. Peck; B. Sadoulet

1986-01-01

304

Global Positioning System Antenna Fixed Height Tripod Adapter  

NASA Technical Reports Server (NTRS)

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.

Dinardo, Steven J.; Smith, Mark A.

1997-01-01

305

Action Learning: Avoiding Conflict or Enabling Action  

ERIC Educational Resources Information Center

Action learning is based on the premise that action and learning are inextricably entwined and it is this potential, to enable action, which has contributed to the growth of action learning within education and management development programmes. However has this growth in action learning lead to an evolution or a dilution of Revan's classical…

Corley, Aileen; Thorne, Ann

2006-01-01

306

Instant Attraction: Immediate Action-Effect Bindings Occur for Both, Stimulus- and Goal-Driven Actions  

PubMed Central

Flexible behavior is only possible if contingencies between own actions and following environmental effects are acquired as quickly as possible; and recent findings indeed point toward an immediate formation of action-effect bindings already after a single coupling of an action and its effect. The present study explored whether these short-term bindings occur for both, stimulus- and goal-driven actions (“forced-choice actions” vs. “free-choice actions”). Two experiments confirmed that immediate action-effect bindings are formed for both types of actions and affect upcoming behavior. These findings support the view that action-effect binding is a ubiquitous phenomenon which occurs for any type of action. PMID:23112787

Janczyk, Markus; Heinemann, Alexander; Pfister, Roland

2012-01-01

307

A PID controller with dynamic set-point weighting  

Microsoft Academic Search

A new set point weighting technique is proposed to improve the set point response and load rejection characteristics of Ziegler-Nichols tuned PID controllers. Instead of a fixed (single or multi-valued) set point weighting factor, here dynamic set point weighting is suggested based on the change of error (Deltae) of the controlled variable and normalized dead time of the process under

Chanchal Dey; R. K. Mudi; T. T. Lee

2006-01-01

308

Holographic Investigation Of Different Types Of Surgical Fixing Devices  

NASA Astrophysics Data System (ADS)

The method of double-exposure holographic interferometry was applied to study the behavior of lower leg bones supported with different fixing devices. The torsion and bending was examined for both types of fixators: an external one (Orthofix type 10000) and an internal one (osteosynthesis AO plate, Howmedica). The influence of the fixation on the mechanical response to the external load of the supported tibial shaft is discussed. The advantages of holographic interferometry in the above investigation are pointed out.

Podbielska, Halina; Kasprzak, Henryk; von Bally, Gert

1989-01-01

309

Renormalization group scale-setting from the action - a road to modified gravity theories  

E-print Network

The renormalization group (RG) corrected gravitational action in Einstein-Hilbert and other truncations is considered. The running scale of the renormalization group is treated as a scalar field at the level of the action and determined in a scale-setting procedure recently introduced by Koch and Ramirez for the Einstein-Hilbert truncation. The scale-setting procedure is elaborated for other truncations of the gravitational action and applied to several phenomenologically interesting cases. It is shown how the logarithmic dependence of the Newton's coupling on the RG scale leads to exponentially suppressed effective cosmological constant and how the scale-setting in particular RG corrected gravitational theories yields the effective $f(R)$ modified gravity theories with negative powers of the Ricci scalar $R$. The scale-setting at the level of the action at the non-gaussian fixed point in Einstein-Hilbert and more general truncations is shown to lead to universal effective action quadratic in Ricci tensor.

Silvije Domazet; Hrvoje Stefancic

2012-11-06

310

Dew Point  

NSDL National Science Digital Library

Determine the dew point temperature for your classroom through a hands-on experiment. Use humidity and temperature probes to investigate the temperature at which it would rain in your classroom! Learn about water density and the conditions necessary to produce fog or rain.

2012-07-19

311

Perception, Action and Cognition  

NSF Publications Database

... Perception, Action & Cognition Description Supports research on perception, action and cognition ... if the results speak to basic issues of perception, action, and cognition. Due Dates Proposals must ...

312

QCD, Gauge Fixing, and the Gribov Problem  

E-print Network

The standard techniques of gauge-fixing, such as covariant gauge fixing, are entirely adequate for the purposes of studies of perturbative QCD. However, they fail in the nonperturbative regime due to the presence of Gribov copies. These copies arise because standard local gauge fixing methods do not completely fix the gauge. Known Gribov-copy-free gauges, such as Laplacian gauge, are manifestly non-local. These issues are examined and the implications of non-local gauge-fixing for ghost fields, BRST invariance, and the proof of renormalizability of QCD are considered.

A. G. Williams

2002-02-07

313

Holography in action  

SciTech Connect

The Einstein-Hilbert action and its natural generalizations to higher dimensions (like the Lanczos-Lovelock action) have certain peculiar features. All of them can be separated into a bulk and a surface term, with a specific (''holographic'') relationship between the two, so that either term can be used to extract information about the other. Further, the surface term leads to entropy of the horizons on shell. It has been argued in the past that these features are impossible to understand in the conventional approach but find a natural explanation if we consider gravity as an emergent phenomenon. We provide further support for this point of view in this paper. We describe an alternative decomposition of the Einstein-Hilbert action and the Lanczos-Lovelock action into a new pair of surface and bulk terms, such that the surface term becomes the Wald entropy on a horizon and the bulk term is the energy density (which is the Arnowitt-Deser-Misner Hamiltonian density for Einstein gravity). We show that this new pair also obeys a holographic relationship, and we give a thermodynamic interpretation of this relation in this context. Since the bulk and surface terms, in this decomposition, are related to the energy and entropy, the holographic condition can be thought of as analogous to inverting the expression for entropy given as a function of energy S=S(E,V) to obtain the energy E=E(S,V) in terms of the entropy in a normal thermodynamic system. Thus the holographic nature of the action allows us to relate the descriptions of the same system in terms of two different thermodynamic potentials. Some further possible generalizations and implications are discussed.

Kolekar, Sanved; Padmanabhan, T. [IUCAA, Post Bag 4, Ganeshkhind, Pune 411 007 (India)

2010-07-15

314

Pointing control for LDR  

NASA Technical Reports Server (NTRS)

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.

Yam, Y.; Briggs, C.

1988-01-01

315

Graphing Points  

NSDL National Science Digital Library

Let's learn how to use the lines on graphs (the x & y axis) to plot information. Choose any of the activities below to test your knowledge of identifying the coordinates correctly. Meteoroid Coordinates Soccer Coordinates Donut Coordinates Graphing Points Save the Zogs!-Using Linear Equations Using your coordinate plane knowledge and linear equations help to rescue the Zogs! Can you find the axis for these problems too? What have you noticed about linear equations? What do the lines in linear equations look ...

Izzy

2012-02-07

316

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)

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.

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

2008-06-01

317

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

Federal Register 2010, 2011, 2012, 2013, 2014

...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...

2013-02-12

318

Reflections on Working with Virtual Action Learning  

ERIC Educational Resources Information Center

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.

Pedler, Mike; Hauser, Bernhard; Caulat, Ghislaine

2014-01-01

319

Point Estimation  

NSDL National Science Digital Library

Created by Kyle Siegrist of the University of Alabama-Huntsville, this is an online, interactive lesson on point estimation. The author provides examples, exercises, and applets about the topic. More specifically, they concern estimators, method of moments, maximum likelihood, Bayes' estimators, best unbiased estimators, and sufficient, complete and ancillary statistics. Additionally, the author provides links to external resources for students looking to engage in a more in-depth study of the topic. This is simply one lesson in a series of seventeen. They are easily accessible as the author has created the site in an online textbook format.

Siegrist, Kyle

2009-02-23

320

Marie Sklodowska-Curie Actions -Individual Fellowships  

E-print Network

Marie Sklodowska-Curie Actions - Individual Fellowships Felix Beckendorf National Contact Point Mobility, Alexander von Humboldt Foundation Potsdam, 16.05.2014 #12;Contents · Marie Sklodowska-Curie Actions in Horizon 2020 · General Information & Eligibility Criteria · Marie Sklodowska-Curie Individual

Potsdam, Universität

321

Nonlocal action in the induction motor  

Microsoft Academic Search

It is pointed out that local field-contact action depends entirely on field-energy momentum transfer to matter, orvice versa. Contact with stationary electromagnetic energy does not produce forces. With this in mind, the paper examines the electrodynamic operation of the common induction motor and concludes that the motor is not, and could not be, driven by local field-contact action.

Peter Graneau

1991-01-01

322

Where's the Action? The Concept of Action in Action Learning  

ERIC Educational Resources Information Center

The purpose of action learning is to learn through devising solutions and strategies in response to problems and implementing them through deliberative action. To understand the relation between action and learning, learners and facilitators need sufficient understanding of both concepts, but they are handicapped by lack of adequate theory and…

Ashton, Sam

2006-01-01

323

Reggeon Non_Factorizability and Fixed Pole in DVCS  

SciTech Connect

We argue that deeply virtual Compton scattering will display Regge behavior {nu}{sub R}{sup {alpha}}(t) at high energy at fixed-t, even at high photon virtuality, not necessarily conventional scaling. A way to see this is to track the Reggeon contributions to quark-nucleon scattering and notice that the resulting Generalized Parton Distributions would have divergent behavior at the break-points. In addition, we show that the direct two-photon to quark coupling will be accessible at large t where it dominates the DVCS amplitude for large energies. This contribution, the J = 0 fixed-pole, should be part of the future DVCS experimental programs at Jlab or LHeC.

Brodsky, Stanley J.; /SLAC; Llanes-Estrada, Felipe J.; /Madrid U.; Londergan, J.Timothy; Szczepaniak, Adam P.; /Indiana U.

2009-08-03

324

Fourier accelerated conjugate gradient lattice gauge fixing  

NASA Astrophysics Data System (ADS)

We provide details of the first implementation of a non-linear conjugate gradient method for Landau and Coulomb gauge fixing with Fourier acceleration. We find clear improvement over the Fourier accelerated steepest descent method, with the average time taken for the algorithm to converge to a fixed, high accuracy, being reduced by a factor of 2 to 4.

Hudspith, R. J.

2015-02-01

325

Fourier Accelerated Conjugate Gradient Lattice Gauge Fixing  

E-print Network

We provide details of the first implementation of a non-linear conjugate gradient method for Landau and Coulomb gauge fixing with Fourier acceleration. We find clear improvement over the Fourier accelerated steepest descent method, with the average time taken for the algorithm to converge to a fixed, high accuracy, being reduced by a factor of 2 to 4.

R. J. Hudspith

2014-05-22

326

Fixed-Response Questions with a Difference.  

ERIC Educational Resources Information Center

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)

Johnstone, Alex H.; Ambusaidi, Abdullah

2002-01-01

327

Parimutuel versus Fixed-Odds Markets  

Microsoft Academic Search

This paper compares the outcomes of parimutuel and competitive fixed-odds betting markets. In the model, there is a fraction of privately informed bettors that maximize expected monetary payoffs. For each market structure, the symmetric equilibria are characterized. In parimutuel betting, the return on longshots is driven to zero as the number of insiders grows large. In fixed odds betting instead,

Marco Ottaviani; Peter Norman Sørensen

328

24 CFR 84.80 - Conditions for use of Lump Sum (fixed price or fixed amount) grants.  

Code of Federal Regulations, 2010 CFR

24 Housing and Urban Development...of Lump Sum (fixed price or fixed amount... Section 84.80 Housing and Urban Development...Secretary, Department of Housing and Urban Development...of Lump Sum (fixed price or fixed...

2010-04-01

329

24 CFR 84.80 - Conditions for use of Lump Sum (fixed price or fixed amount) grants.  

Code of Federal Regulations, 2011 CFR

24 Housing and Urban Development...of Lump Sum (fixed price or fixed amount... Section 84.80 Housing and Urban Development...Secretary, Department of Housing and Urban Development...of Lump Sum (fixed price or fixed...

2011-04-01

330

A Fix by Total Solar Eclipse  

NASA Astrophysics Data System (ADS)

In anticipation of the TOTAL Solar Eclipse on 11 August 1999 (see the January/February issue of Navigation News), it seemed very appropriate to repeat this short article by one of the Institute's most respected Fellows. It was first published in Vol. VII, October 1954.A TOTAL eclipse of the Sun provides an opportunity, rare though it may be, of obtaining an instantaneous fix from the Sun alone. Eclipses vary greatly in character, in position on the Earth, in the width of the path of totality, in the duration, and also in the direction of the path. However, the shadow of the Moon cast by the Sun is always a right circular cone which, in the case of a total eclipse, intersects the Earth's surface at some point before its vertex. Owing to the motion of the Moon in its orbit round the Earth, the shadow moves at a speed of about 2000 m.p.h. from west to east (it varies considerably according to the distance of the Moon from the Earth). The intersection of this cone with the Earth's surface is an ellipse, which moves over the surface at speeds which are very high when the cone is nearly tangential (i.e. when the Sun's altitude is low) and at speeds as low as about 1000 m.p.h., when the eclipse is central over the equator at noon and the Earth's rotation has its maximum effect. The speed of the shadow is generally low enough to give a position line of considerable accuracy from the observed time of either second or third contacts, that is the beginning or ending of the total phase. An error of 1 second corresponds, in the most favourable case, to about one-third of a mile. The position line is, of course, the portion of the elliptic shadow corresponding to the observed phase and time; these can be precomputed.

Sadler, D. H.

331

Supersymmetric component actions via coset approach  

NASA Astrophysics Data System (ADS)

We propose a method to construct the on-shell component actions for the theories with 1/2 partial breaking of global supersymmetry within the nonlinear realization (coset) approach. In contrast with the standard superfield approach in which unbroken supersymmetry plays the leading role, we have shifted the attention to the spontaneously broken supersymmetry. It turns out that in the theories in which half of supersymmetries is spontaneously broken, all physical fermions are just the fermions of the nonlinear realization. Moreover, the transformation properties of these fermions with respect to the broken supersymmetry are the same as in the famous Volkov-Akulov model. Just this fact completely fixed all possible appearances of the fermions in the component action: they can enter the action through the determinant of the vielbein (to compensate the transformation of the volume form) and the covariant derivatives, only. It is very important that in our parametrization of the coset the rest of physical components, i.e. all bosonic components, transform as “matter fields” with respect to the broken supersymmetry. Clearly, in such a situation the component action acquires the form of the Volkov-Akulov action for these “matter fields”. The complete form of the action can be further fixed by two additional requirements: (a) to reproduce the bosonic limit, which is explicitly known in many interesting cases, and (b) to have a proper linearized form, which has to be invariant with respect to the linearized unbroken supersymmetry. We supply the general consideration by a detailed example of the component action of N=1 supermembrane in D=4 constructed within our procedure. In this case we provide the exact proof of the invariance of the constructed component action with respect to both, broken and unbroken supersymmetries.

Bellucci, S.; Krivonos, S.; Sutulin, A.

2013-10-01

332

75 FR 77602 - Allocation and Designation of Spectrum for Fixed-Satellite Services in the 37.5-38.5 GHz, 40.5-41...  

Federal Register 2010, 2011, 2012, 2013, 2014

...FEDERAL COMMUNICATIONS COMMISSION 47 CFR...Spectrum for Fixed-Satellite Services in the 37...Bands AGENCY: Federal Communications Commission. ACTION...SUMMARY: The Federal Communications Commission published...technical rules for satellite systems in the...

2010-12-13

333

Applicationsfor2014 5 points 4 points 3 points 2 points 1 point  

E-print Network

(Individual) State Open (Senior State Representation) Coach Career Management Program Australian School Boys/Girls Footballers' Association (A or W League) Member of Australian Team open or underage (all sports) Member of Australian underage team for a particular sport #12;MUSIC Applicationsfor2014 5 points 4 points 3 points 2

New South Wales, University of

334

Einsteinian gravity from a topological action  

Microsoft Academic Search

The curvature-squared model of gravity, in the affine form proposed by Weyl\\u000aand Yang, is deduced from a topological action in 4D. More specifically, we\\u000astart from the Pontrjagin (or Euler) invariant. Using the BRST antifield\\u000aformalism with a double duality gauge fixing, we obtain a consistent\\u000aquantization in spaces of double dual curvature as classical instanton type\\u000abackground.\\u000a However,

Eckehard W. Mielke

2007-01-01

335

Einsteinian gravity from a topological action  

Microsoft Academic Search

The curvature-squared model of gravity, in the affine form proposed by Weyl and Yang, is deduced from a topological action\\u000a in 4D. More specifically, we start from the Pontrjagin (or Euler) invariant. Using the BRST antifield formalism with a double\\u000a duality gauge fixing, we obtain a consistent quantization in spaces of double dual curvature as classical instanton type background. However,

Eckehard W. Mielke

2008-01-01

336

Impulse Action on D-particles in Robertson-Walker Space Times, Higher-Order Logarithmic Conformal Algebras and Cosmological Horizons  

E-print Network

We demonstrate that an impulse action (`recoil') on a D-particle embedded in a (four-dimensional) cosmological Robertson-Walker (RW) spacetime is described, in a $\\sigma$-model framework, by a suitably extended higher-order logarithmic world-sheet algebra of relevant deformations. We study in some detail the algebra of the appropriate two-point correlators, and give a careful discussion as to how one can approach the world-sheet renormalization group infrared fixed point, in the neighborhood of which the logarithmic algebra is valid. It is found that, if the initial RW spacetime does not have cosmological horizons, then there is no problem in approaching the fixed point. However, in the presence of horizons, there are world-sheet divergences which imply the need for Liouville dressing in order to approach the fixed point in the correct way. A detailed analysis on the subtle subtraction of these divergences in the latter case is given. In both cases, at the fixed point, the recoil-induced spacetime is nothing other than a coordinate transformation of the initial spacetime into the rest frame of the recoiling D-particle. However, in the horizon case, if one identifies the Liouville mode with the target time, which expresses physically the back reaction of the recoiling D-particle onto the spacetime structure, it is found that the induced spacetime distortion results in the removal of the initial cosmological horizon and the eventual stopping of the acceleration of the Universe. In this latter sense, our model may be thought of as a conformal field theory description of a (toy) Universe characterized by a sort of `phase transition' at the moment of impulse, implying a time-varying speed of light.

Elias Gravanis; Nick E. Mavromatos

2001-06-16

337

Renormalization flow of SU(3) lattice gauge actions  

SciTech Connect

We present a numerical study of the Migdal renormalization transformation for lattice SU(3) gauge theory. We confirm the existence of a large-distance universal fixed-line action. For large ..beta.. we identify this universal action as the heat-kernel action. For small ..beta.. we find that the universal action lies on a predetermined surface of ''critical positivity.'' For space-time dimensions greater than d = 4, we provide evidence that there exists a deconfining phase transition in both SU(2) and SU(3) lattice gauge theories, and that unlike the case for d = 4 there is no window from the asymptotically free region into the confining phase.

Bitar, K.M.; Duke, D.W.; Jadid, M.

1985-03-15

338

Final consolidated action plan to Tiger Team. Volume 1  

SciTech Connect

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.

Not Available

1992-10-01

339

Preliminary Measurements of the Xenon Triple Point  

NASA Astrophysics Data System (ADS)

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.

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

2014-04-01

340

The Fixed Irreducible Bridge Ensemble for Self-Avoiding Walks  

NASA Astrophysics Data System (ADS)

We define a new ensemble for self-avoiding walks in the upper half-plane, the fixed irredicible bridge ensemble, by considering self-avoiding walks in the upper half-plane up to their $n$-th bridge height, $Y_n$, and scaling the walk by $1/Y_n$ to obtain a curve in the unit strip, and then taking $n\\to\\infty$. We then conjecture a relationship between this ensemble to $\\SLE$ in the unit strip from $0$ to a fixed point along the upper boundary of the strip, integrated over the conjectured exit density of self-avoiding walk spanning a strip in the scaling limit. We conjecture that there exists a positive constant $\\sigma$ such that $n^{-\\sigma}Y_n$ converges in distribution to that of a stable random variable as $n\\to\\infty$. Then the conjectured relationship between the fixed irreducible bridge scaling limit and $\\SLE$ can be described as follows: If one takes a SAW considered up to $Y_n$ and scales by $1/Y_n$ and then weights the walk by $Y_n$ to an appropriate power, then in the limit $n\\to\\infty$, one should obtain a curve from the scaling limit of the self-avoiding walk spanning the unit strip. In addition to a heuristic derivation, we provide numerical evidence to support the conjecture and give estimates for the boundary scaling exponent.

Gilbert, Michael James

2015-01-01

341

Experiences with Light Weight Fixed Wing Aerial Mapping UAVs  

NASA Astrophysics Data System (ADS)

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.

Mayr, W.

2014-11-01

342

The fixed irreducible bridge ensemble for self-avoiding walks  

E-print Network

We define a new ensemble for self-avoiding walks in the upper half-plane, the fixed irredicible bridge ensemble, by considering self-avoiding walks in the upper half-plane up to their $n$-th bridge height, $Y_n$, and scaling the walk by $1/Y_n$ to obtain a curve in the unit strip, and then taking $n\\to\\infty$. We then conjecture a relationship between this ensemble to $\\SLE$ in the unit strip from $0$ to a fixed point along the upper boundary of the strip, integrated over the conjectured exit density of self-avoiding walk spanning a strip in the scaling limit. We conjecture that there exists a positive constant $\\sigma$ such that $n^{-\\sigma}Y_n$ converges in distribution to that of a stable random variable as $n\\to\\infty$. Then the conjectured relationship between the fixed irreducible bridge scaling limit and $\\SLE$ can be described as follows: If one takes a SAW considered up to $Y_n$ and scales by $1/Y_n$ and then weights the walk by $Y_n$ to an appropriate power, then in the limit $n\\to\\infty$, one should obtain a curve from the scaling limit of the self-avoiding walk spanning the unit strip. In addition to a heuristic derivation, we provide numerical evidence to support the conjecture and give estimates for the boundary scaling exponent.

Michael James Gilbert

2014-10-17

343

29 CFR 1917.118 - Fixed ladders.  

Code of Federal Regulations, 2010 CFR

...members of tanks and towers; (3) Ladders...rails or to another structure. (2) Fixed ladder...permanently attached to a structure, building or piece...electrical power and similar towers, poles and structures, including...

2010-07-01

344

EVALUATING MULTICOMPONENT COMPETITIVE ADSORPTION IN FIXED BEDS  

EPA Science Inventory

An equilibrium column model (ECM) was developed to evaluate multicomponent competition in fixed-bed adsorption columns. The model ignores mass transfer resistances and uses ideal adsorbed solution theory to predict the competitive effects in multicomponent mixtures. The bed capac...

345

computational inverse medium scattering at fixed frequency  

E-print Network

FIXED FREQUENCY. Gang Bao? and Peijun Li† .... Using the special form of the incident wave and the test function, we then get. ?. D ..... 447–452. [13] F. Natterer, The Mathematics of Computerized Tomography, Stuttgart: Teubner, 1986. 10.

2005-12-08

346

Fast integer programming in fixed Friedrich Eisenbrand  

E-print Network

program in fixed dimension with a fixed number of constraints can be computed with O(s) basic arithmetic operations, where s is the binary encoding length of the input. This improves on the quadratic running time an integral matrix A 2 Z m#2;n and integral vectors b 2 Z m ; d 2 Z n , determine maxfd T x j Ax 6 b; x 2 Z n

347

Fixed-target physics at Fermilab  

SciTech Connect

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.

Bjorken, J.D.

1985-03-01

348

Recombinant human factor VIIa (rFVIIa) can activate factor FIX on activated platelets.  

PubMed

The studies reported here show that factor (F)VIIa can activate factor (F)IX on activated platelets in the absence of tissue factor. Both FIX and FIXa bind to the activated platelet surface with a K(d) of 8 nM and 2 nM, respectively. With factor (F)VIIIa, FIXa binds more tightly to platelets (K(d) 0.6 nM). At rFVIIa concentrations < 100 nm, no direct binding to the activated platelet surface can be detected with electrophoretic light scattering. However, in the presence of FIX, rFVIIa binding to platelets at concentrations as low as 10 nm rFVIIa can be detected. This is reflected by a decrease in the FIX K(d) from 8 to 1.6 nM. When rFVIIa is added to activated platelets in the presence of both FIX and FVIIIa, the K(d) for FIX decreases to 0.6, suggesting that rFVIIa activates FIX on the surface of activated platelets in the absence of tissue factor. The activation of FIX by FVIIa on activated platelets can also be demonstrated by a functional assay for FIXa. These data show that pharmacological doses of rFVIIa result in the direct activation of FIX by rFVIIa to form additional tenase complexes ultimately resulting in improved thrombin generation. These results may explain, at least in part, the mechanism of action of rFVIIa in hemorrhagic conditions seen in otherwise normal patients who develop an acquired coagulopathy due to trauma, surgery or a variety of other events in which rFVIIa has been found to be effective. PMID:15456494

Gabriel, D A; Li, X; Monroe, D M; Roberts, H R

2004-10-01

349

Lattice QCD, gauge fixing, and the transition to the perturbative regime  

E-print Network

Perturbative QCD uses the Faddeev-Popov gauge-fixing procedure, which leads to ghosts and the local BRST invariance of the gauge-fixed perturbative QCD action. In the asymptotic regime, where perturbative QCD is relevant, Gribov copies can be neglected. In the nonperturbative regime, one must adopt either a nonlocal Gribov-copy free gauge (e.g., Laplacian gauge) or attempt to maintain local BRST invariance at the expense of admitting Gribov copies. These issues are explored and discussed. In addition, the relationship between recent Dyson-Schwinger based calculations of the infrared behavior of QCD Green's functions and the lattice calculation of these quantities is examined.

Anthony G. Williams

2002-12-26

350

Climate change action plan  

E-print Network

Delivery Climate change action plan 2009-2011 #12;2 | Climate change action plan ©istockphoto.com #12;Climate Change Action Plan Climate change action plan | 3 Contents Overview 4 Preface and Introduction 5 Climate change predictions for Scotland 6 The role of forestry 7 Protecting and managing

351

"Hedgehog Point" feature point matching based on point structure information  

NASA Astrophysics Data System (ADS)

Based on points structure information, this paper presents a new method called "hedgehog point" matching, a fast algorithm for point pattern matching is proposed to effectively solve the problems of optimal matches between two point pattern under geometrical transformation and correctly identify the missing or spurious points of patterns. Theorems and algorithms are developed to determine the matching pairs support of each point pair and its transformation parameters (scaling S and rotation ?) on a two-parameter space (S, ?). Experiments are conducted both on real and synthetic data. The experimental results show that the proposed matching algorithm can handle translation, rotation, and scaling differences under noisy or distorted condition.

Xu, Yi-dan; Zhu, Xian-wei; Yu, Qi-feng

2009-07-01

352

Deriving Motor Primitives Through Action Segmentation  

PubMed Central

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

Hemeren, Paul E.; Thill, Serge

2011-01-01

353

MPI Point-to-Point Communication  

NSDL National Science Digital Library

This module details and differentiates the various types of point-to-point communication available in MPI. Point-to-point communication involves transmission of a message between a pair of processes, as opposed to collective communication, which involves a group of processes.

354

47 CFR 25.277 - Temporary fixed earth station operations.  

Code of Federal Regulations, 2014 CFR

...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...

2014-10-01

355

49 CFR 218.109 - Hand-operated fixed derails.  

Code of Federal Regulations, 2013 CFR

...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...

2013-10-01

356

49 CFR 218.109 - Hand-operated fixed derails.  

Code of Federal Regulations, 2010 CFR

...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...

2010-10-01

357

49 CFR 218.109 - Hand-operated fixed derails.  

Code of Federal Regulations, 2011 CFR

...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...

2011-10-01

358

49 CFR 218.109 - Hand-operated fixed derails.  

Code of Federal Regulations, 2012 CFR

...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...

2012-10-01

359

47 CFR 25.277 - Temporary fixed earth station operations.  

Code of Federal Regulations, 2012 CFR

...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...

2012-10-01

360

47 CFR 25.277 - Temporary fixed earth station operations.  

Code of Federal Regulations, 2013 CFR

...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...

2013-10-01

361

47 CFR 25.277 - Temporary fixed earth station operations.  

Code of Federal Regulations, 2011 CFR

...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...

2011-10-01

362

47 CFR 25.277 - Temporary fixed earth station operations.  

Code of Federal Regulations, 2010 CFR

...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...

2010-10-01

363

Action spectrum for phototherapy of psoriasis  

SciTech Connect

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.

Parrish, J.A.; Jaenicke, K.F.

1981-05-01

364

[Resin-bonded fixed partial dentures].  

PubMed

A resin-bonded fixed partial denture is a prosthetic construction which can replace I or several teeth in an occlusal system and which comprises a pontic element which is adhesively attached to 1 or more abutment teeth. To compensate for the limited shear strength of the adhesive layer, the Jixed partial denture is occlusally supported by the abutment(s). A direct resin-bonded fixed partial denture is made of composite, reinforced or not by a frame of flexible metal or fiber material. For an indirect resin-bonded fixed partial denture, a metal, fibre-reinforced composite or ceramic substructure is fabricated in a dental laboratory. The basic principle of a resin-bonded fixed partial denture is minimal invasiveness. However, a restoration in an abutment tooth requires a certain occlusal space which is realized by tooth preparation. Resistance preparations may be performed to improve the longevity of resin-bonded fixed partial dentures. Both financially and biologically, a resin-bonded bridge is a cost-effective prosthetic construction. The longevity is limited, but when the construction fails the negative consequences for the abutments are generally limited, which leaves open several types of other treatments. PMID:23495569

Kreulen, C M; Creugers, N H J

2013-02-01

365

View-invariant Action Recognition from Point Triplets  

E-print Network

- spective distortions, differences in viewpoints, unknown camera parameters, anthropometric variations. Moreover, our formulation relaxes restrictive anthropometric assumptions such as isometry. This is due

Foroosh, Hassan

366

75 FR 28851 - Notice of Final Federal Agency Actions on Proposed Highway in Washington  

Federal Register 2010, 2011, 2012, 2013, 2014

...at Evergreen Point Road to the interchange at SR 202 in Redmond. The project spans the communities of Medina, Hunts Point, Yarrow Point, Clyde Hill, Kirkland, Bellevue, and Redmond. The actions by the FHWA on this project, and the...

2010-05-24

367

77 FR 40490 - Revocation and Modification of Multiple Domestic, Alaskan, and Hawaiian Compulsory Reporting Points  

Federal Register 2010, 2011, 2012, 2013, 2014

...compulsory reporting points. Additionally, this action also requires changes to the name of four navigation...compulsory reporting points. The FAA is removing...compulsory reporting points that require name changes, to be consistent...

2012-07-10

368

ACTIONS AND PARTIAL ACTIONS OF INDUCTIVE CONSTELLATIONS  

E-print Network

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

Gould, Victoria

369

Vibration suppression of fixed-time jib crane maneuvers  

SciTech Connect

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.

Parker, G.G.; Petterson, B.; Dohrmann, C.R.; Robinett, R.D.

1995-02-01

370

Assisting People with Developmental Disabilities to Improve Pointing Efficiency with an Automatic Pointing Assistive Program  

ERIC Educational Resources Information Center

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…

Shih, Ching-Hsiang; Hsu, Nai-Yun; Shih, Ching-Tien

2009-01-01

371

Hard and fast rules about the body: contributions of the action stream to judging body space.  

PubMed

Analogously to the visual system, somatosensory processing may be segregated into two streams, with the body constituting either part of the action system or a perceptual object. Experimental studies with participants free from neurological disease which test this hypothesis are rare, however. The present study explored the contributions of the two putative streams to a task that requires participants to estimate the spatial properties of their own body. Two manipulations from the visuospatial literature were included. First, participants were required to point either backward towards pre-defined landmarks on their own body (egocentric reference frame) or to a forward projection of their own body (allocentric representation). Second, a manipulation of movement mode was included, requiring participants to perform pointing movements either immediately, or after a fixed delay, following instruction. Results show that accessing an allocentric representation of one's own body results in performance changes. Specifically, the spatial bias shown to exist for body space when pointing backward at one's own body disappears when participants are requested to mentally project their body to a pre-defined location in front space. Conversely, delayed execution of pointing movements does not result in performance changes. Altogether, these findings provide support for a constrained dual stream hypothesis of somatosensory processing and are the first to show similarities in the processing of body space and peripersonal space. PMID:21688141

Hach, Sylvia; Ishihara, Masami; Keller, Peter E; Schütz-Bosbach, Simone

2011-08-01

372

Fixed Torque Dynamo and Motor Model  

NSDL National Science Digital Library

The Fixed Torque Dynamo and Motor Model solves the coupled differential equations for an electric motor driven by a dynamo (generator). The model can be used as to illustrate elementary instabilities or bifurcations discussed in courses about nonlinear oscillators and dynamical systems. When the dynamo is driven at constant torque, chaotic reversals of the generated current and of the angular rotation of the motor are observed. The main window displays the dynamo angular velocity ?1, motor angular velocity ?2 and current I time series and a second window displays the phase space. The stator current Is (A), torque T (Nâ¢m), and resistance R (ohm) are adjustable. The Fixed Torque Dynamo and Motor Model was created using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double click the ejs_chaos_FixedTorqueDynamoAndMotor.jar file to run the program if Java is installed.

Christian, Wolfgang

2011-11-23

373

Point-to-Point Car Racing: an Initial Study of Evolution Versus Temporal Difference Learning  

Microsoft Academic Search

This paper considers variations on an extremely simple form of car racing, the challenge being to visit as many way-points as possible in a fixed amount of time. The simplicity of the models enables a very thorough evaluation of various learning algorithms and control architectures, and enables other researchers to work on the same models with relative ease. The models

Simon M. Lucas; Julian Togelius

2007-01-01

374

Nitric Oxide in Nitrogen-Fixing Symbiosis  

Microsoft Academic Search

The establishment and functioning of nitrogen-fixing symbioses between legumes and rhizobia rely on\\u000a a succession of infectious, developmental, and metabolic processes, which end in the formation of root\\u000a nodules and the acquisition of nitrogen-fixing capacity by the bacteria. A tight regulation is required\\u000a for the establishment of a successful interaction, and the identification of the regulatory network\\u000a operating is therefore a major challenge for

Emmanuel Baudouin; Nicolas Pauly; Alain Puppo

375

Pull-In Voltage of Fixed-Fixed End Type MEMS Switches with Variative Electrostatic Area  

Microsoft Academic Search

In this paper we developed a new approach to calculation of pull-in voltage of fixed- fixed end type MEMS switches. In the previous works Pull-in voltage has been calculated on a lumped model, when one of them used a distributed model by assuming the electrostatic area is applied the whole of the surface of the beam. In the present work,

Hamed Sadeghian; Ghader Rezazadeh; Ehsan Malekpour; Ayla Shafipour

376

Solutions to Mechanical Errors in Writing: Usage Scans and Fix-It Pages.  

ERIC Educational Resources Information Center

Notes how through personalized instructional tools, students become aware of their own patterns of error, locate and correct errors, and learn to use a handbook. Describes how usage scans (student-led mini-lesson on some point of grammar or style) and fix-it pages (an ongoing record of the student kept by the teacher) work. (SG)

Sitler, Helen Collins

2001-01-01

377

An improved finite difference method for fixed-bed multicomponent sorption  

Microsoft Academic Search

This paper reports on a new computational procedure based on the finite difference methods developed to solve the coupled partial differential equations describing nonisothermal and nonequilibrium sorption of multiple adsorbate systems on a fixed bed that contains bidispersed pellets. In this numerical method, a solution-adaptive gridding technique (SAG) is applied in combination with a four-point quadratic upstream differencing scheme to

L. M. Sun; F. Meunier

1991-01-01

378

Unifying Bit-width Optimisation for Fixed-point and Floating-point Designs Altaf Abdul Gaffar1  

E-print Network

, Oskar Mencer1 , Wayne Luk1 and Peter Y.K. Cheung2 1 Department of Computing, Imperial College, London SW7 2BZ, UK. 2 Department of EEE, Imperial College, London SW7 2BT, UK. Abstract This paper presents approach using four case studies: ray-tracing, function approximation, Finite-Impulse Response (FIR

Mencer, Oskar

379

Assitive Technology in Action  

MedlinePLUS

... Skip Navigation Contact Us The Family Center on Technology and Disability Assistive Technology Works Home AT in Action Video Series About ... Success Stories En Español Useful Sites Videos - Assistive Technology in Action Meet Joe A Look at Assistive ...

380

Feature point extraction in compressed domain  

NASA Astrophysics Data System (ADS)

This document presents several approaches to extract interest points within compressed images (based on DCT compression methods). The goal is to minimize the stages and/or the calculation costs for image sequence indexing tasks or database retrieval from a significant MPEG file repository. Initially, only the fixed images (I-Frames) are take under consideration, motion will be integrated in further research. The traditional invariant feature points (Harris corner points, points with remarquable principal curvatures) are extracted from images using a gradient estimate (first order derivative) or the Laplacian (second-order derivative) of an image. So the first part of this paper handles in detail the derivation of the signal from DCT blocks. The trials to implement feature points detection as close as possible to the DCT coefficient are explained. Results provided by our last DCT-blockwise curvature estimatiorare also shown.

Coudray, Renan; Besserer, Bernard; Courtellemont, Pierre

2003-01-01

381

Characterizing configurations of fire ignition points through spatiotemporal point processes  

NASA Astrophysics Data System (ADS)

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.

Comas, C.; Costafreda-Aumedes, S.; Vega-Garcia, C.

2014-04-01

382

Species-specific diversity of a fixed motor pattern: the electric organ discharge of Gymnotus.  

PubMed

Understanding fixed motor pattern diversity across related species provides a window for exploring the evolution of their underlying neural mechanisms. The electric organ discharges of weakly electric fishes offer several advantages as paradigmatic models for investigating how a neural decision is transformed into a spatiotemporal pattern of action. Here, we compared the far fields, the near fields and the electromotive force patterns generated by three species of the pulse generating New World gymnotiform genus Gymnotus. We found a common pattern in electromotive force, with the far field and near field diversity determined by variations in amplitude, duration, and the degree of synchronization of the different components of the electric organ discharges. While the rostral regions of the three species generate similar profiles of electromotive force and local fields, most of the species-specific differences are generated in the main body and tail regions of the fish. This causes that the waveform of the field is highly site dependant in all the studied species. These findings support a hypothesis of the relative separation of the electrolocation and communication carriers. The presence of early head negative waves in the rostral region, a species-dependent early positive wave at the caudal region, and the different relationship between the late negative peak and the main positive peak suggest three points of lability in the evolution of the electrogenic system: a) the variously timed neuronal inputs to different groups of electrocytes; b) the appearance of both rostrally and caudally innervated electrocytes, and c) changes in the responsiveness of the electrocyte membrane. PMID:18461122

Rodríguez-Cattaneo, Alejo; Pereira, Ana Carolina; Aguilera, Pedro A; Crampton, William G R; Caputi, Angel A

2008-01-01

383

Effects of ethanol on multiple fixed-interval fixed-ratio schedule performances: dynamic interactions at different fixed-ratio values.  

PubMed Central

Key pecking by three pigeons was maintained under a multiple fixed-interval fixed-ratio schedule of food presentation. The fixed-interval value remained at 3 minutes, while the fixed-ratio size was increased systematically in 30-response increments from 30 to either 120 (two pigeons) or 150 (one pigeon). At least two lower fixed-ratio values were also redetermined. The effects of ethanol (5 to 2.5 g/kg) were assessed at each of the different schedule parameters. Both overall and running response rates under the fixed-ratio schedule decreased with increases in the size of the fixed-ratio schedule; pause duration under the fixed-ratio schedule was directly related to increases in fixed-ratio size. Overall and running rates of responding under the fixed-interval schedule changed little with increases in the size of the fixed-ratio schedule. Despite the relative invariance of fixed-interval responding across the different fixed-ratio values, the effects of ethanol on responding under the fixed-interval schedule differed depending on the size of the fixed-ratio schedule. Greater increases occurred in both overall and in lower local rates of responding under the fixed-interval schedule when the fixed-ratio value was 120 or 150. The effects of ethanol on responding under the fixed-ratio schedule also depended on the size of the fixed ratio. Increases in responding under the fixed-ratio schedule were typically greater at the higher fixed-ratio values where response rates were lower. When the effects of ethanol were redetermined at the lower fixed-ratio parameter values, rates and patterns of responding were comparable to those obtained initially. However, the dose-effect curves for responding under both fixed-ratio and fixed-interval schedules were shifted up and to the right of those determined during the ascending series. The effects of ethanol can depend on rate or responding, behavioral history, and the context in which behavior occurs. PMID:7411015

Barrett, J E; Stanley, J A

1980-01-01

384

Planning as Action Research  

ERIC Educational Resources Information Center

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…

de Gonzalez, Carmen Beatriz; Hernandez, Teresa; Kusch, Jim; Ryan, Charly

2004-01-01

385

Retrieving actions in movies  

Microsoft Academic Search

We address recognition and localization of human ac- tions in realistic scenarios. In contrast to the previous work studying human actions in controlled settings, here we train and test algorithms on real movies with substantial vari- ation of actions in terms of subject appearance, motion, surrounding scenes, viewing angles and spatio-temporal ex- tents. We introduce a new annotated human action

Ivan Laptev; Patrick Pérez

2007-01-01

386

Action in Development  

ERIC Educational Resources Information Center

It is argued that cognitive development has to be understood in the functional perspective provided by actions. Actions reflect all aspects of cognitive development including the motives of the child, the problems to be solved, and the constraints and possibilities of the child's body and sensorimotor system. Actions are directed into the future…

von Hofsten, Claes

2007-01-01

387

Restoration 2013 ACTION PLAN  

E-print Network

Columbia Estuary Ecosystem Restoration Program 2013 ACTION PLAN DRAFT Prepared by the Bonneville with the most current plans and schedule for restoration actions and research, monitoring, and evaluation/Corps. 2012. Columbia Estuary Ecosystem Restoration Program: 2013 Action Plan. Draft, prepared

388

Fixed Capital Adjustment: Is Latin America Different?  

Microsoft Academic Search

We examine capital adjustment patterns using two large and largely novel plant-level data sets from the manufacturing sectors of Colombia and Mexico. The data suggest that irreversibilities play a more important role than in more-advanced economies. However, we do not find support for the presence of increasing returns in the adjustment cost technology, such as arising from fixed costs. Firms

R. Gaston Gelos; Alberto Isgut

2001-01-01

389

Physics landscape-fixed target energies  

SciTech Connect

An introductory review is presented of physics issues and opportunities at Fermilab fixed-target energies. Included are discussions of precision electroweak studies; deep inelastic lepton scattering; heavy quark production, spectroscopy, and decays; perturbative QCD; prompt photon production; massive lepton production; and spin dependence. 79 refs., 7 figs.

Berger, E.L.

1989-10-01

390

Fixing Embryos Johnston Lab, November 2003  

E-print Network

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

Johnston, Laura

391

Fixed mobile convergence -some considerations. Azfar Aslam  

E-print Network

. A subsystem within the packet domain, called IP Multimedia Subsystem, IMS, has also been developed. IMS has an architecture that supports multimedia services including telephony and messaging. IMS is IP based multimedia the mobile and fixed line evolution towards multimedia services over IP. It can, therefore, be concluded

Haddadi, Hamed

392

"If the Water Is Nasty, Fix It."  

ERIC Educational Resources Information Center

After taking an environmental inventory of their community, seventh-graders in a Denver-area middle school decided to tackle the drinking water problem and fix it. The school is one of seven participating in Earth Force, an environmental and community-service-learning program based in Alexandria, Virginia. The program's progress and six-step…

Boston, Bruce O.

1999-01-01

393

The Mirage of Fixed Exchange Rates  

Microsoft Academic Search

This paper discusses the profound difficulties of maintaining fixed exchange rates in a world of expanding global capital markets. Contrary to popular wisdom, industrialized-country monetary authorities easily have the resources to defend exchange parities against virtually any private speculative attack. But if their commitment to use those resources lacks credibility with markets, the costs to the broader economy of defending

Maurice Obstfeld; Kenneth Rogoff

1995-01-01

394

Autothermal fixed-bed reactor concepts  

Microsoft Academic Search

The principles, properties and applications of autothermal fixed-bed reactor concepts are presented. First we focus on different reactor types for weakly exothermic reactions and discuss their basic behavior, their stability and nonlinear dynamic features. The second part is devoted to the autothermal coupling of endothermic and exothermic reactions. A systematic classification is proposed for the process alternatives developed so far

G Kolios; J Frauhammer; G Eigenberger

2000-01-01

395

Flow direction measurement with fixed probes  

NASA Technical Reports Server (NTRS)

Fixed-position probes for determination of flow direction in one and two planes are tested over a wide range of Reynolds numbers and Mach numbers. The work is limited to tests of a single probe design for two dimensional flow and a single design for three dimensional flow.

Dudzinski, T. J.; Krause, L. N.

1969-01-01

396

Match-fixing under competitive odds  

Microsoft Academic Search

Two bookmakers compete in Bertrand fashion while setting odds on the outcomes of a sporting contest where an influential punter (or betting syndicate) may bribe some player(s) to fix the contest. Zero profit and bribe prevention may not always hold together. When the influential punter is quite powerful, the bookies may coordinate on prices and earn positive profits for fear

Parimal Kanti Bag; Bibhas Sahay

2011-01-01

397

Variation in the action spectrum of erythrolabe among deuteranopes.  

PubMed Central

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

Alpern, M; Pugh, E N

1977-01-01

398

Members of the ethylene signalling pathway are regulated in sugarcane during the association with nitrogen-fixing endophytic bacteria  

Microsoft Academic Search

Nitrogen-fixing bacteria have been isolated from sugar- cane in an endophytic and beneficial interaction that promotes plant growth. In this work, for the first time, the involvement of ethylene signalling in this inter- action was investigated by molecular characterizing members of this pathway in sugarcane. The expres- sion pattern of a putative ethylene receptor (SCER1) and two putative ERF transcription

J. J. V. Cavalcante; C. Vargas; E. M. Nogueira; F. Vinagre; K. Schwarcz; J. I. Baldani; P. C. G. Ferreira; A. S. Hemerly

2007-01-01

399

Effect of Ocimum sanctum fixed oil on blood pressure, blood clotting time and pentobarbitone-induced sleeping time  

Microsoft Academic Search

Ocimum sanctum fixed oil produced hypotensive effect in anaesthetised dog, which seems to be due to its peripheral vasodilatory action. The oil increased blood-clotting time and percentage increase was comparable to aspirin and could be due to inhibition of platelet aggregation. The oil also increased pentobarbitone-induced sleeping time in rats indicating probable inhibitory effect of oil towards cytochromic enzyme responsible

Surender Singh; H. M. S Rehan; D. K Majumdar

2001-01-01

400

Parallel genetic algorithms for large-scale fixed charge networks  

SciTech Connect

We present parallel genetic algorithms (GA`s) for several classes of fixed-charge multicommodity flow problems arising from applications in parallel database design, domain decomposition, and telecommunications. These algorithms utilize a high-level approach based upon representing individual (in the GA sense) in terms of selections from a library of pre-computed {open_quotes}building blocks{close_quotes} of sets of variables rather than as values of individual binary variables corresponding to single links. The fitness function for this form of representation is then evaluated by applying heuristics to the starting point represented by an individual, thereby allowing for modifications in the original {open_quotes}blueprint{close_quotes} represented by the individual. These heuristics lead to objective function improvements and are also used to force feasibility. With this type of fitness function, the amount of time spent on the other operations of the GA (selection, mutation, etc.) is relatively small, so that high efficiency may be achieved in parallel implementations of the algorithm. We present computational results on the CM-5 supercomputer, demonstrating the ability to solve to optimality certain fixed-charge problems with more than one million binary variables.

Meyer, R.R.

1994-12-31

401

Nonlinear inferential cascade control of exothermic fixed-bed reactors  

SciTech Connect

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.

Hua, X.; Jutan, A.

2000-05-01

402

Action GoMac  

NSDL National Science Digital Library

Action GoMac, the anchor and most useful of the four new Action Utilities (Action Menus, Action GoMac, Action WYSIWYG, and Action Files), offers a start menu, task bar, and clock tray quite similar to those in Windows. However, GoMac allows customization and integration with a variety of Mac OS features. In addition to featuring drag-and-drop functionality for adding items to the start menu, GoMac allows the placement of control strip modules in the clock tray area. GoMac also features "command-tab" application switching much like Windows. Users can download a 30-day demo of GoMac and the other Action Utilities. The full version is $39.95 on CD-ROM or $29.95 for the Web version. Requirements: Mac OS System 7.6 or later.

403

Melting point, boiling point, and symmetry.  

PubMed

The relationship between the melting point of a compound and its chemical structure remains poorly understood. The melting point of a compound can be related to certain of its other physical chemical properties. The boiling point of a compound can be determined from additive constitutive properties, but the melting point can be estimated only with the aid of nonadditive constitutive parameters. The melting point of some non-hydrogen-bonding, rigid compounds can be estimated by the equation MP = 0.772 * BP + 110.8 * SIGMAL + 11.56 * ORTHO + 31.9 * EXPAN - 240.7 where MP is the melting point of the compound in Kelvin, BP is the boiling point, SIGMAL is the logarithm of the symmetry number, EXPAN is the cube of the eccentricity of the compound, and ORTHO indicates the number of groups that are ortho to another group. PMID:2235894

Abramowitz, R; Yalkowsky, S H

1990-09-01

404

Fuel optimal maneuvers for spacecraft with fixed thrusters  

NASA Technical Reports Server (NTRS)

Several mathematical models, including a minimum integral square criterion problem, were used for the qualitative investigation of fuel optimal maneuvers for spacecraft with fixed thrusters. The solutions consist of intervals of "full thrust" and "coast" indicating that thrusters do not need to be designed as "throttleable" for fuel optimal performance. For the primary model considered, singular solutions occur only if the optimal solution is "pure translation". "Time optimal" singular solutions can be found which consist of intervals of "coast" and "full thrust". The shape of the optimal fuel consumption curve as a function of flight time was found to depend on whether or not the initial state is in the region admitting singular solutions. Comparisons of fuel optimal maneuvers in deep space with those relative to a point in circular orbit indicate that qualitative differences in the solutions can occur. Computation of fuel consumption for certain "pure translation" cases indicates that considerable savings in fuel can result from the fuel optimal maneuvers.

Carter, T. C.

1982-01-01

405

Preliminary investigation of pilot scanning techniques of dial pointing instruments  

NASA Technical Reports Server (NTRS)

Two pilots' methods of looking at instruments with needle pointers in a fixed base helicopter simulation were observed. A total of 45 runs were analyzed for each pilot. The data indicated that two apparently different techniques were being used; one looking at the needle point, the other looking at a fixed spot on the instrument and reading the needle direction parafoveally. The latter technique is found to be somewhat faster with both pilots accomplishing the flying task.

Harris, R. L., Sr.

1979-01-01

406

Fixed target electroweak and hard scattering physics  

SciTech Connect

The possibilities for future physics and experiments involving weak and electromagnetic interactions, neutrino oscillations, general hard scattering and experiments involving nuclear targets were explored. The studies were limited to the physics accessible using fixed target experimentation. While some of the avenues explored turn out to be relatively unrewarding in the light of competition elsewhere in the world, there are a number of positive conclusions reached about experimentation in the energy range available to the Main Injector and Tevatron. Some of the experiments would benefit from the increased intensity available from the Tevatron utilizing the Main Injector, while some require this increase. Finally, some of the experiments would use the Main Injector low energy, high intensity extracted beams directly. A program of electroweak and hard scattering experiments at fixed target energies retains the potential for important contributions to physics. The key to major parts of this program would appear to be the existence of the Main Injector. 115 refs, 17 figs.

Brock, R. (Michigan State Univ., East Lansing, MI (USA)); Brown, C.N.; Montgomery, H.E. (Fermi National Accelerator Lab., Batavia, IL (USA)); Corcoran, M.D. (eds.) (Rice Univ., Houston, TX (USA))

1990-02-01

407

Evolutionary robot action development based upon Intelligent Composite Action Control  

Microsoft Academic Search

This paper presents a framework for evolutionary robot action development to autonomously plan complex\\/diverse cooperative actions and skillfully perform them. Complex actions are realized based upon the Intelligent Composite Action Control, which is a learning methodology for intelligent robots that gradually realize complex actions from fundamental motions. The Multi-stage Genetic Algorithm (MGA) is used for efficient construction of action intelligence.

Masakazu Suzuki

2010-01-01

408

The fixed bed nuclear reactor concept  

Microsoft Academic Search

In the present work, the basic features of a new reactor type, the so-called Fixed Bed Nuclear Reactor (FBNR) is presented. FBNR is a small reactor (40MWe) without the need of on-site refueling. It utilizes the PWR technology but uses the HTGR type fuel elements. It has the characteristics of being simple in design, modular, inherent safety, passive cooling, proliferation

Sümer ?ahin; Farhang Sefidvash

2008-01-01

409

Nitrogen fixing microorganisms in paddy soils XII  

Microsoft Academic Search

IntroductionWe have been studying the interrelation between R. capsulatus and other various microorganisms, in which there are symbiotic relationships (I). When R. capsulatlls and Az. vinelandii co-existed, molecular nitrogen was fixed much more than in each pure culture and many slime substances (polysaccharides, muco-polysaccharides etc.) were produced (2). In order to study symbiotic nitrogen fixation between the two microorganisms, first,

Azuma Okuda; Michiharu Kobayashi; Konoshin Onodera; Michio Himeno

1964-01-01

410

Opportunistic control of action in intelligent agents  

Microsoft Academic Search

Given its multiple goals, limited resources, and dynamic environment, an intelligent agent must decide which of many possible actions to execute at each point in time. Planning and reactive models embody two different modes of control. By contrast, a 2D space of control modes is characterized, each of which maximizes the quality of run-time behavior in the corresponding region of

Barbara Hayes-Roth

1993-01-01

411

An action of the cactus group  

E-print Network

We construct an action of the big cactus group (the fundamental group of the Deligne-Mumford compactification of the moduli space of real curves of genus zero with n undistinguished marked points) on Fock-Goncharov's SL_m analog of the decorated Teichmuller space of ideal n-gons.

Henriques, Andre

2007-01-01

412

Tzitzéica transformation is a dressing action  

E-print Network

We classify the simplest rational elements in a twisted loop group, and prove that dressing actions of them on proper indefinite affine spheres give the classical Tzitz\\'eica transformation and its dual. We also give the group point of view of the Permutability Theorem, construct complex Tzitz\\'eica transformations, and discuss the group structure for these transformations.

Erxiao Wang

2006-05-15

413

The Tipping Point and the Adventure Advantage.  

ERIC Educational Resources Information Center

Insights from chaos theory--the interconnectedness of everything, nonlinear cause and effect, leverage and the "tipping point," and the importance of aligning interventions within a system--are applied to social action and illustrated via the role of adventure education in school and community interventions in the Brattleboro (Vermont) Leadership…

Prouty, Dick

1998-01-01

414

Fixed-interval and fixed-ratio reinforcement schedules with human subjects  

PubMed Central

Operant laboratory studies were conducted as part of the regular activities of a psychiatric research ward. This report includes only some early data obtained from the ward staff, not the patients. A multiple schedule having alternating fixed-ratio and fixed-interval components permitted observations of acquisition and maintenance of behavior at low schedule values, transition to and final performance at greater schedule values, and behavioral changes after a limited-hold contingency was added to the fixed-interval. Prior to the added limited-hold, subjects used watches to time the interval, and usually responded only once before obtaining each fixed-interval reinforcement. Short limited-hold values eliminated clock watching and increased fixed-interval responding. Subjects communicated freely with each other, and it was clear that their performances were controlled both by the contingencies and by instructions. Just as clearly, the instructions themselves were controlled by the contingencies. It was concluded that the kinds of verbal control that were responsible for “nonstandard” fixed-interval performances did not require the postulation of any new behavioral principles. PMID:22477562

Stoddard, Lawrence T.; Sidman, Murray; Brady, Joseph V.

1988-01-01

415

RSRM nozzle fixed housing cooldown test  

NASA Technical Reports Server (NTRS)

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.

Bolieau, D. J.

1989-01-01

416

Zirconia in fixed prosthesis. A literature review  

PubMed Central

Statement of problem: Evidence is limited on the efficacy of zirconia-based fixed dental prostheses. Objective: To carry out a literature review of the behavior of zirconium oxide dental restorations. Material and Methods: This literature review searched the Pubmed, Scopus, Medline and Cochrane Library databases using key search words “zirconium oxide,” “zirconia,” “non-metal restorations,” “ceramic oxides,” “veneering ceramic,” “zirconia-based fixed dental prostheses”. Both in vivo and in vitro studies into zirconia-based prosthodontic restoration behavior were included. Results: Clinical studies have revealed a high rate of fracture for porcelain-veneered zirconia-based restorations that varies between 6% and 15% over a 3- to 5-year period, while for ceramo-metallic restorations the fracture rate ranges between 4 and 10% over ten years. These results provoke uncertainty as to the long-term prognosis for this material in the oral medium. The cause of veneering porcelain fractures is unknown but hypothetically they could be associated with bond failure between the veneer material and the zirconia sub-structure. Key words:Veneering ceramic, zirconia-based ceramic restoration, crown, zirconia, tooth-supported fixed prosthesis. PMID:24596638

Román-Rodríguez, Juan L.; Ferreiroa, Alberto; Solá-Ruíz, María F.; Fons-Font, Antonio

2014-01-01

417

Point fixings in annealed and tempered glass structures: Modeling and optimization of bolted connections  

Microsoft Academic Search

In the design of high load bearing elements made of tempered flat glass, connections cannot be avoided when large spans or high stiffness beams are considered. This paper investigates bolted connections in glass structures; the main objective is to determine the optimal joint. This work is performed through the determination of stress states due to both thermal tempering and in-plane

Fabrice Bernard; Laurent Daudeville

2009-01-01

418

Fixed-Point Trigonometry with CORDIC Iterations”. Apple Computer White Paper  

E-print Network

CORDIC is an acronym that stands for COordinate Rotation DIgital Computer, and was coined by Volder [Volder 59]. Its concepts have been further developed to include calculation of the Discrete Fourier Transform [Despain 74], exponential, logarithm, forward and inverse circular and hyperbolic

Ken Turkowski

1990-01-01

419

Fixed-Point Optimization of Atoms and Density in DFT L. D. Marks*  

E-print Network

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

Marks, Laurence D.

420

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...

421

S1/2 Regularization Methods and Fixed Point Algorithms for Affine ...  

E-print Network

the general Schatten q (0 approximate the rank of a matrix, in ... problem (1.1) is an extension of the well-known sparse signal recovery (or .... associated with the solutions to problem (1.7), and establish an exact.

2013-09-24

422

A fixed point method for homotopic l 0-minimization with application to MR image recovery  

NASA Astrophysics Data System (ADS)

A novel method for highly-undersampled Magnetic Resonance Image (MRI) reconstruction is presented. One of the principal challenges faced in clinical MR imaging is the fundamental linear relation between net exam duration and admissible spatial resolution. Increased scan duration diminishes patient comfort while increasing the risk of susceptibility to motion artifact and limits the ability to depict many physiological events at high temporal rates. With the recent development of Compressive Sampling theory, several authors have successfully demonstrated that clinical MR images possessing a sparse representation in some transform domain can be accurately reconstructed even when sampled at rates well below the Nyquist limit by casting the recovery as a convex l I-minimization problem. While l I-based techniques offer a sizeable advantage over Nyquist-limited methods, they nonetheless require a modest degree of over-sampling above the true theoretical minimum sampling rate in order to guarantee the achievability of exact reconstruction. In this work, we present a reconstruction model based on homotopic approximation of the l 0 quasi-norm and discuss the ability of this technique to reconstruct undersampled MR images at rates even lower than are achievable than with l I-minimization and arbitrarily close to the true minimum sampling rate. A semi-implicit numerical solver is presented for efficient numerical computation of the reconstruction process and several examples depicting the capability for accurate MRI reconstructions from highly-undersampled K-space data are presented.

Trzasko, Joshua D.; Manduca, Armando

2008-03-01

423

Fixed point of self-similar Lennard-Jones potentials in the glass transition  

E-print Network

The existence of potential energy landscape in the glass transition has been theoretically proved using the recursive equation of reinforce-restraint of self-similar 8 orders of Lennard-Jones (L-J) potential fluctuations. The stability condition for fluctuation reinforce-restraint is just the Lindemann ratio that is exactly deduced as 0.1047in this paper. The origin and transfer of interface excitation comes of the balance between self-similar L-J potential fluctuation and geometric phase potential fluctuation, which also gives rise to a new attractive potential of -17/16\\epsilon_i, lower than the potential well energy -\\epsilon_i of i-th order of L-J potential, in the self-similar mean field of mean fields of different sizes. The delocalization energy of two-body is exactly the transfer energy of excited interface, and the delocalization path is along 8 orders of geodesics in topological analyses.

Jialin Wu

2007-01-09

424

COMMON FIXED POINTS ITERATION PROCESS FOR A FINITE FAMILY OF ASYMPTOTICALLY  

E-print Network

) asymptotically nonexpansvie if there exists a sequence {un} in [0, +) with limn un = 0 and kTn x - Tn yk (1 + un a sequence {un} in [0, +) with limn un = 0 and kTn x - pk (1 + un)kx - pk, for all x C, p F(T) and n = 1, 2, . . . ; (v) uniformly L-Lipschitzian if there exists a constant L > 0 such that kTn x - Tn yk

Khan, Abdul Rahim

425

Balance between absorbing and positive fixed points in resource consumption models.  

PubMed

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

Behar, Hilla; Shnerb, Nadav; Louzoun, Yoram

2012-09-01

426

Pattern recognition in neural networks with competing dynamics: coexistence of fixed-point and cyclic attractors.  

PubMed

We study the properties of the dynamical phase transition occurring in neural network models in which a competition between associative memory and sequential pattern recognition exists. This competition occurs through a weighted mixture of the symmetric and asymmetric parts of the synaptic matrix. Through a generating functional formalism, we determine the structure of the parameter space at non-zero temperature and near saturation (i.e., when the number of stored patterns scales with the size of the network), identifying the regions of high and weak pattern correlations, the spin-glass solutions, and the order-disorder transition between these regions. This analysis reveals that, when associative memory is dominant, smooth transitions appear between high correlated regions and spurious states. In contrast when sequential pattern recognition is stronger than associative memory, the transitions are always discontinuous. Additionally, when the symmetric and asymmetric parts of the synaptic matrix are defined in terms of the same set of patterns, there is a discontinuous transition between associative memory and sequential pattern recognition. In contrast, when the symmetric and asymmetric parts of the synaptic matrix are defined in terms of independent sets of patterns, the network is able to perform both associative memory and sequential pattern recognition for a wide range of parameter values. PMID:22900014

Herrera-Aguilar, José L; Larralde, Hernán; Aldana, Maximino

2012-01-01

427

Pattern Recognition in Neural Networks with Competing Dynamics: Coexistence of Fixed-Point and Cyclic Attractors  

PubMed Central

We study the properties of the dynamical phase transition occurring in neural network models in which a competition between associative memory and sequential pattern recognition exists. This competition occurs through a weighted mixture of the symmetric and asymmetric parts of the synaptic matrix. Through a generating functional formalism, we determine the structure of the parameter space at non-zero temperature and near saturation (i.e., when the number of stored patterns scales with the size of the network), identifying the regions of high and weak pattern correlations, the spin-glass solutions, and the order-disorder transition between these regions. This analysis reveals that, when associative memory is dominant, smooth transitions appear between high correlated regions and spurious states. In contrast when sequential pattern recognition is stronger than associative memory, the transitions are always discontinuous. Additionally, when the symmetric and asymmetric parts of the synaptic matrix are defined in terms of the same set of patterns, there is a discontinuous transition between associative memory and sequential pattern recognition. In contrast, when the symmetric and asymmetric parts of the synaptic matrix are defined in terms of independent sets of patterns, the network is able to perform both associative memory and sequential pattern recognition for a wide range of parameter values. PMID:22900014

Herrera-Aguilar, José L.; Larralde, Hernán; Aldana, Maximino

2012-01-01

428

Balance between absorbing and positive fixed points in resource consumption models  

NASA Astrophysics Data System (ADS)

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.

Behar, Hilla; Shnerb, Nadav; Louzoun, Yoram

2012-09-01

429

China's Economy in 2005: At a New Turning Point and Need to Fix Its Development Problems  

Microsoft Academic Search

Cina's economy in 2005 chalked up another year of 9.9 percent surging growth. In 2005 the government's attention was focused on the many negative consequences of China's past unbridled economic growth, from rural poverty to environmental degradation and wide income disparities, calling for more \\

John Wong

2006-01-01

430

Competition Between Transients in the Rate of Approach to a Fixed Point*  

PubMed Central

The goal of this paper is to provide and apply tools for analyzing a specific aspect of transient dynamics not covered by previous theory. The question we address is whether one component of a perturbed solution to a system of differential equations can overtake the corresponding component of a reference solution as both converge to a stable node at the origin, given that the perturbed solution was initially farther away and that both solutions are nonnegative for all time. We call this phenomenon tolerance, for its relation to a biological effect. We show using geometric arguments that tolerance will exist in generic linear systems with a complete set of eigenvectors and in excitable nonlinear systems. We also define a notion of inhibition that may constrain the regions in phase space where the possibility of tolerance arises in general systems. However, these general existence theorems do not not yield an assessment of tolerance for specific initial conditions. To address that issue, we develop some analytical tools for determining if particular perturbed and reference solution initial conditions will exhibit tolerance. PMID:20011076

Day, Judy; Rubin, Jonathan E.; Chow, Carson C.

2009-01-01

431

Semantics of concurrent systems: a modular fixed-point trace approach  

Microsoft Academic Search

A method for finding the set of processes generated by a concurrent system (the behaviour of a system) in modular way is presented. A system is decomposed into modules with behaviours assumed to be known and then the behaviours are successively put together giving finally the initial system behaviour. It is shown that there is much of freedom in choice

Antoni W. Mazurkiewicz; Warszawa Poland

1984-01-01

432

Fixed points and limit cycles in the population dynamics of lysogenic viruses and their hosts  

NASA Astrophysics Data System (ADS)

Starting with stochastic rate equations for the fundamental interactions between microbes and their viruses, we derive a mean-field theory for the population dynamics of microbe-virus systems, including the effects of lysogeny. In the absence of lysogeny, our model is a generalization of that proposed phenomenologically by Weitz and Dushoff. In the presence of lysogeny, we analyze the possible states of the system, identifying a limit cycle, which we interpret physically. To test the robustness of our mean-field calculations to demographic fluctuations, we have compared our results with stochastic simulations using the Gillespie algorithm. Finally, we estimate the range of parameters that delineate the various steady states of our model.

Wang, Zhenyu; Goldenfeld, Nigel

2010-07-01

433

Final Report for "Infrared Fixed Points in Multiflavor Lattice Gauge Theory"  

SciTech Connect

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.

Meurice, Yannick; Sinclair, Donald K.

2013-09-27

434

Fixed-Point Iterations for Asymptotically Nonexpansive Mappings in Banach Spaces  

Microsoft Academic Search

In this paper, we suggest and analyze a three-step iterative scheme for asymptotically nonexpansive mappings in Banach spaces. The new iterative scheme includes Ishikawa-type and Mann-type interations as special cases. The results obtained in this paper represent an extension as well as refinement of previous known results.

Benlong Xu; Muhammad Aslam Noor

2002-01-01

435

Fixed Points of the Similarity Renormalization Group and the Nuclear Many-Body Problem  

NASA Astrophysics Data System (ADS)

The Similarity Renormalization Group reduces the off-shellness by driving the evolved interaction towards a diagonal band. We analyze the infrared limit and the corresponding on-shell interactions and its consequences for light nuclei. Using a harmonic oscillator shell model we obtain a Tjon line B ? = 4 B t - 3 B d which can be understood from a combinatorics counting of nucleon pairs and triplets in the triton and ?-particle and compares favorably with realistic calculations.

Ruiz Arriola, E.; Szpigel, S.; Timóteo, V. S.

2014-08-01

436

Optimization by the Fixed-Point Method Version 2.11  

E-print Network

Nov 26, 2011 ... In the name of God, the Benificent, the Merciful ..... entry in the following table. Symbol. Description/Definition. Chapter, page. 1i ..... or w = vt are called central ; sets comprising central elements are called central. ...... increased by linearization; to ensure this we periodically apply Newton's method using the ...

2011-11-26

437

Diffraction of limit periodic point sets  

E-print Network

Limit periodic point sets are aperiodic structures with pure point diffraction supported on a countably, but not finitely generated Fourier module that is based on a lattice and certain integer multiples of it. Examples are cut and project sets with p-adic internal spaces. We illustrate this by explicit results for the diffraction measures of two examples with 2-adic internal spaces. The first and well-known example is the period doubling sequence in one dimension, which is based on the period doubling substitution rule. The second example is a weighted planar point set that is derived from the classic chair tiling in the plane. It can be described as a fixed point of a block substitution rule.

Michael Baake; Uwe Grimm

2010-07-05

438

Instructed Task Demands and Utilization of Action Effect Anticipation  

PubMed Central

Automatic acquisition of action effect associations may serve as a parsimonious account of how people acquire the basis for intentionally controlled action. However, recent research suggests that learning or the expression of action effect links might depend on whether task demands impose either a stimulus based mode of action control or an intention based action control mode. In the current study we develop a paradigm that allows the mode of action control to be varied via instructions while keeping stimuli identical. Participants were to respond to the location of a cloud of dots. Their actions were followed by predictable visual effects, either consistently congruent or incongruent with the location of the action. In Experiment 1, a displaced new cloud of random dots was presented as a spatial action effect. In Experiment 2 an arrow was presented as effect with a pointing direction congruent or incongruent to the response position. The location of the stimulus in the reference frame was easy to detect in some of the trials while the location of the cloud of dots was completely ambiguous in others. The instruction manipulation targeted the latter trials, suggesting to one group of participants to freely choose a key in a difficult trial, while asking another group to react to their spontaneous impression in the event of a difficult stimulus. In this way, we aimed at rendering actions either as stimulus driven or internally generated. By this we could investigate how effect anticipation changed with practice depending on action mode. We employed the impact of action effect compatibility on speed and choice of action as a measure for action effect anticipation. Our results suggest that action effect associations can be acquired when instructions suggest stimulus based action control or intention based action control. Instructions aiming at the mode of task processing can influence when and how action effect links influence behavior. PMID:23431066

Gaschler, Robert; Nattkemper, Dieter

2012-01-01

439

Action Figures and Men  

Microsoft Academic Search

Three studies were conducted to determine whether action figures contributed to negative body images in the young adult men\\u000a who handled them. In Study 1 and Study 2, participants were randomly assigned to different conditions to handle action figures\\u000a with different muscularity levels. The participants were instructed to place the action figures into various positions for\\u000a a set time limit.

Chris Barlett; Richard Harris; Sara Smith; Jennifer Bonds-Raacke

2005-01-01

440

Exploring Capillary Action  

NSDL National Science Digital Library

Students observe multiple examples of capillary action. First they observe the shape of a glass-water meniscus and explain its shape in terms of the adhesive attraction of the water to the glass. Then they study capillary tubes and observe water climbing due to capillary action in the glass tubes. Finally, students experience a real-world application of capillary action by designing and using "capillary siphons" to filter water.

NSF CAREER Award and RET Program, Mechanical Engineering and Material Science,

441

Postpartum Depression Action Plan  

MedlinePLUS

MENU Return to Web version Postpartum Depression | Postpartum Depression Action Plan Patient __________________________ Physician/NP/PA __________________ Clinic ____________________________ Phone Number ____________________ Choose one area and add other ...

442

Point-to-Point Tunneling Protocol (PPTP)  

Microsoft Academic Search

This document specifies a protocol which allows the Point to Point Protocol (PPP) to be tunneled through an IP network. PPTP does not specify any changes to the PPP protocol but rather describes a new vehicle for carrying PPP. A client-server architecture is defined in order to decouple functions which exist in current Network Access Servers (NAS) and support Virtual

W. Verthein; J. Taarud; G. Zorn

1996-01-01

443

Point Counter Point UAR Codons for Glutamine  

E-print Network

Point Counter Point UAR Codons for Glutamine P.J. Keeling and W.F. Doolittle (1996) reported that UAR (TAR) codons incorporate glutamine in Hexamiti- dae. They state that ``the particular variation became the sole chain termination codon and UAA and UAG were removed from the terminator sites

Keeling, Patrick

444

Studying and removing effects of fixed topology in a quantum mechanical model  

E-print Network

At small lattice spacing, or when using e.g. overlap fermions, lattice QCD simulations tend to become stuck in a single topological sector. Physical observables then differ from their full QCD counterparts by 1/V corrections, where V is the spacetime volume. Brower et al. and Aoki et al. have derived equations by means of a saddle point approximation, to determine and to remove these corrections. We extend these equations and apply them to a simple toy model, a quantum mechanical particle on a circle in a square well potential at fixed topology. This model can be solved numerically up to arbitrary precision and allows to explore effects arising due to fixed topology. We investigate the range of validity and accuracy of the above mentioned equations, to remove such fixed topology effects.

Arthur Dromard; Marc Wagner

2013-10-30

445

When water does not boil at the boiling point.  

PubMed

Every schoolchild learns that, under standard pressure, pure water always boils at 100 degrees C. Except that it does not. By the late 18th century, pioneering scientists had already discovered great variations in the boiling temperature of water under fixed pressure. So, why have most of us been taught that the boiling point of water is constant? And, if it is not constant, how can it be used as a 'fixed point' for the calibration of thermometers? History of science has the answers. PMID:17336380

Chang, Hasok

2007-03-01

446

SPS antenna pointing control  

NASA Technical Reports Server (NTRS)

The pointing control of a microwave antenna of the Satellite Power System was investigated emphasizing: (1) the SPS antenna pointing error sensing method; (2) a rigid body pointing control design; and (3) approaches for modeling the flexible body characteristics of the solar collector. Accuracy requirements for the antenna pointing control consist of a mechanical pointing control accuracy of three arc-minutes and an electronic phased array pointing accuracy of three arc-seconds. Results based on the factors considered in current analysis, show that the three arc-minute overall pointing control accuracy can be achieved in practice.

Hung, J. C.

1980-01-01

447

Improvements in the realization of the ITS-90 over the temperature range from the melting point of gallium to the freezing point of silver at NIM  

SciTech Connect

The temperature primary standard over the range from the melting point of gallium to the freezing point of silver in National institute of Metrology (NIM), China, was established in the early 1990s. The performance of all of fixed-point furnaces degraded and needs to be updated due to many years of use. Nowadays, the satisfactory fixed point materials can be available with the development of the modern purification techniques. NIM plans to use a group of three cells for each defining fixed point temperature. In this way the eventual drift of individual cells can be evidenced by periodic intercomparison and this will increase the reliability in disseminating the ITS-90 in China. This article describes the recent improvements in realization of ITS-90 over temperature range from the melting point of gallium to the freezing point of silver at NIM. Taking advantages of the technological advances in the design and manufacture of furnaces, the new three-zone furnaces and the open-type fixed points were developed from the freezing point of indium to the freezing point of silver, and a furnace with the three-zone semiconductor cooling was designed to automatically realize the melting point of gallium. The reproducibility of the new melting point of gallium and the new open-type freezing points of In, Sn, Zn. Al and Ag is improved, especially the freezing points of Al and Ag with the reproducibility of 0.2mK and 0.5mK respectively. The expanded uncertainty in the realization of these defining fixed point temperatures is 0.34mK, 0.44mK, 0.54mK, 0.60mK, 1.30mK and 1.88mK respectively.

Sun, J.; Zhang, J. T.; Ping, Q. [National institute of Metrology, Beijing (China)] [National institute of Metrology, Beijing (China)

2013-09-11

448

Ash level meter for a fixed-bed coal gasifier  

DOEpatents

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.

Fasching, George E. (Morgantown, WV)

1984-01-01

449

Development and application of an unconstrained technique for patient positioning in fixed radiation beams.  

PubMed

A flexible technique for positioning patients in fixed orientation radiation fields such as those used in neutron capture therapy (NCT) has been developed. The positioning technique employs reference points marked on the patient in combination with a 3D digitizer to determine the beam entry point and a template fitted to the patient's head is used to determine the proper beam orientation. A coordinate transformation between the CT image data and reference points on the patient determined by a least squares algorithm based on singular value decomposition is used to map the beam entry point from the planning system onto the patient. The technique was validated in a phantom study where the mean error in entry point placement was 1.3 mm. Five glioblastoma multiforme patients have been treated with NCT using this positioning technique. PMID:15308141

Kiger, W S; Albritton, J R; Lu, X Q; Palmer, M R

2004-11-01

450

Action Plan Materials Science  

E-print Network

Action Plan 2010-2013 Materials Science Area EXECUTIVE SUMMARY #12;N.B.: If you require any further-13 Action Plan. Area 6 6Materials Science Area 1. GENERAL INFORMATION Description of the area At present 2003-2007. The Materials Science and Technology area looks to a future where society (in its broadest

Fitze, Patrick

451

25 Action Learning Schools.  

ERIC Educational Resources Information Center

This booklet on action-learning reflects an interest in preparing youth for the world of real experiences. Arranged in two major parts, the first offers information on the background and development of action-learning. Included in this section are the conclusions of the Panel on Youth of the President's Science Advisory Committee, the National…

National Association of Secondary School Principals, Reston, VA.

452

Action Research in Practice  

ERIC Educational Resources Information Center

Action research places a powerful tool for school improvement in the hands of teachers. By highlighting the outcomes that are possible and presenting clear steps in the research process, this book is one to encourage anyone who is seeking to implement evidence-based school improvement. Eileen Piggot-Irvine uses her Problem Resolving Action

Piggot-Irvine, Eileen

2009-01-01

453

Renormalized action improvements  

SciTech Connect

Finite lattice spacing artifacts are suppressed on the renormalized actions. The renormalized action trajectories of SU(N) lattice gauge theories are considered from the standpoint of the Migdal-Kadanoff approximation. The minor renormalized trajectories which involve representations invariant under the center are discussed and quantified. 17 references.

Zachos, C.

1984-01-01

454

Action Languages Michael Gelfond  

E-print Network

Action Languages Michael Gelfond Department of Computer Science University of Texas at El Paso signature hV; F; Ai consists of (i) a set S, (ii) a function V from F \\Theta S into V, and (iii) a subset R. The states s 0 such that hs; A; s 0 i 2 R are the possible results of the execution of the action

Lifschitz, Vladimir

455

Electrophysiology of Action Representation  

Microsoft Academic Search

We continuously act on objects, on other individuals, and on ourselves, and actions represent the only way we have to manifest our own desires and goals. In the last two decades, electrophysio- logical experiments have demonstrated that actions are stored in the brain according to a goal-related organization. The authors review a series of experimental data showing that this \\

Luciano Fadiga; Laila Craighero

2004-01-01

456

Fixed Target Beauty Physics Experimental Programs  

SciTech Connect

The current and near term future fixed target physics efforts in observing particles with open beauty are reviewed. This includes a compilation of the non-observation upper limits and the observation of both upsilon and b-states. A short discussion of the theoretical predictions for the hadro-produced beauty pairs is included. The major part of this review is devoted to the techniques and tricks employed, a survey of the current and proposed experiments. A personal summary of the experimental prospects concludes this report. 28 refs., 26 figs.

Garbincius, P.H.

1987-11-01

457

A floating-point processor for the Texas Instruments model 980A computer  

E-print Network

in all calculations. In the fixed-point format, the radix point is "fixed" in its actual position in the number. The programmer must keep track of the radix point as calculations proceed, or additional programming must be done to keep track of it.... In the floating-point format, a scale factor is included as part of the number itself, and the radix point is maintained between the most significant bit (MSB) of the number and the sign bit. This format greatly extends the range of numbers which can...

Brinkmann, Hubert Eldie

2012-06-07

458

47 CFR 101.125 - Temporary fixed antenna height restrictions.  

Code of Federal Regulations, 2011 CFR

... 2011-10-01 false Temporary fixed antenna height restrictions. 101.125 Section...Technical Standards § 101.125 Temporary fixed antenna height restrictions. The overall antenna structure heights employed by mobile...

2011-10-01

459

47 CFR 101.125 - Temporary fixed antenna height restrictions.  

Code of Federal Regulations, 2013 CFR

... 2013-10-01 false Temporary fixed antenna height restrictions. 101.125 Section...Technical Standards § 101.125 Temporary fixed antenna height restrictions. The overall antenna structure heights employed by mobile...

2013-10-01

460

47 CFR 101.125 - Temporary fixed antenna height restrictions.  

Code of Federal Regulations, 2010 CFR

... 2010-10-01 false Temporary fixed antenna height restrictions. 101.125 Section...Technical Standards § 101.125 Temporary fixed antenna height restrictions. The overall antenna structure heights employed by mobile...

2010-10-01

461

47 CFR 101.125 - Temporary fixed antenna height restrictions.  

Code of Federal Regulations, 2012 CFR

... 2012-10-01 false Temporary fixed antenna height restrictions. 101.125 Section...Technical Standards § 101.125 Temporary fixed antenna height restrictions. The overall antenna structure heights employed by mobile...

2012-10-01

462

47 CFR 22.737 - Temporary fixed stations.  

Code of Federal Regulations, 2010 CFR

... 2010-10-01 false Temporary fixed stations. 22.737 Section 22.737 Telecommunication...Service Conventional Rural Radiotelephone Stations § 22.737 Temporary fixed stations. The FCC may, upon proper...

2010-10-01

463

46 CFR 118.410 - Fixed gas fire extinguishing systems.  

Code of Federal Regulations, 2014 CFR

...2014-10-01 2014-10-01 false Fixed gas fire extinguishing systems. 118.410 Section 118...OVERNIGHT ACCOMMODATIONS FOR MORE THAN 49 PASSENGERS FIRE PROTECTION EQUIPMENT Fixed Fire Extinguishing and Detecting Systems §...

2014-10-01

464

46 CFR 181.410 - Fixed gas fire extinguishing systems.  

Code of Federal Regulations, 2014 CFR

...2014-10-01 2014-10-01 false Fixed gas fire extinguishing systems. 181.410 Section 181...SMALL PASSENGER VESSELS (UNDER 100 GROSS TONS) FIRE PROTECTION EQUIPMENT Fixed Fire Extinguishing and Detecting Systems §...

2014-10-01

465

Flattening fixed-angle chains is strongly NP-hard  

E-print Network

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 ...

Demaine, Erik D.

466

46 CFR 28.320 - Fixed gas fire extinguishing systems.  

Code of Federal Regulations, 2011 CFR

...pre-engineered fixed gas fire extinguishing system must: (i) Be...addition to any automatic actuation devices...power ventilation systems serving the protected...pre-engineered fixed gas fire extinguishing system... (i) A visual alarm to indicate...

2011-10-01

467

46 CFR 28.320 - Fixed gas fire extinguishing systems.  

Code of Federal Regulations, 2010 CFR

...pre-engineered fixed gas fire extinguishing system must: (i) Be...addition to any automatic actuation devices...power ventilation systems serving the protected...pre-engineered fixed gas fire extinguishing system... (i) A visual alarm to indicate...

2010-10-01

468

46 CFR 28.320 - Fixed gas fire extinguishing systems.  

Code of Federal Regulations, 2012 CFR

...pre-engineered fixed gas fire extinguishing system must: (i) Be...addition to any automatic actuation devices...power ventilation systems serving the protected...pre-engineered fixed gas fire extinguishing system... (i) A visual alarm to indicate...

2012-10-01

469

46 CFR 28.320 - Fixed gas fire extinguishing systems.  

Code of Federal Regulations, 2013 CFR

...pre-engineered fixed gas fire extinguishing system must: (i) Be...addition to any automatic actuation devices...power ventilation systems serving the protected...pre-engineered fixed gas fire extinguishing system... (i) A visual alarm to indicate...

2013-10-01

470

46 CFR 169.565 - Fixed carbon dioxide system.  

Code of Federal Regulations, 2014 CFR

...2014-10-01 2014-10-01 false Fixed carbon dioxide system. 169.565 Section 169...Firefighting Equipment § 169.565 Fixed carbon dioxide system. (a) The number of pounds of carbon dioxide required for each space...

2014-10-01

471

34 CFR 76.566 - Fixed costs-restricted rate.  

Code of Federal Regulations, 2010 CFR

... Fixed costs-restricted rate. 76.566 Section 76...Subgrantees? Indirect Cost Rates § 76.566 Fixed costs—restricted rate. As used in § 76.564...pension payments; (b) Unemployment compensation payments;...

2010-07-01

472

Critical two-dimensional Ising model with free, fixed ferromagnetic, fixed antiferromagnetic, and double antiferromagnetic boundaries  

NASA Astrophysics Data System (ADS)

The critical two-dimensional Ising model is studied with four types boundary conditions: free, fixed ferromagnetic, fixed antiferromagnetic, and fixed double antiferromagnetic. Using bond propagation algorithms with surface fields, we obtain the free energy, internal energy, and specific heat numerically on square lattices with a square shape and various combinations of the four types of boundary conditions. The calculations are carried out on the square lattices with size N ×N and 30

Wu, Xintian; Izmailyan, Nickolay

2015-01-01

473

FixO3 : Early progress towards Open Ocean observatory Data Management Harmonisation  

NASA Astrophysics Data System (ADS)

Since 2002 there has been a sustained effort, supported as European framework projects, to harmonise both the technology and the data management of Open Ocean fixed observatories run by European nations. FixO3 started in September 2013, and for 4 years will coordinate the convergence of data management best practice across a constellation of moorings in the Atlantic, in both hemispheres, and in the Mediterranean. To ensure the continued existence of these unique sources of oceanographic data as sustained observatories it is vital to improve access to the data collected, both in terms of methods of presentation, real-time availability, long-term archiving and quality assurance. The data management component of FixO3 will improve access to marine observatory data by harmonizing data management standards and workflows covering the complete life cycle of data from real time data acquisition to long-term archiving. Legal and data policy aspects will be examined to identify transnational barriers to open-access to marine observatory data. A harmonised FixO3 data policy is being synthesised from the partner's existing policies, which will overcome the identified barriers, and provide a formal basis for data exchange between FixO3 infrastructures. Presently, the interpretation and implementation of accepted standards has considerable incompatibilities within the observatory community, and these different approaches will be unified into the FixO3 approach. Further, FixO3 aims to harmonise data management and standardisation efforts with other European and international marine data and observatory infrastructures. The FixO3 synthesis will build on the standards established in other European infrastructures such as EDMONET, SEADATANET, PANGAEA, EuroSITES (European contribution to JCOMMP OceanSITES programme), and MyOcean (the Marine Core Service for GMES) infrastructures as well as relevant international infrastructures and data centres such as the ICOS Ocean Thematic Centre. The data management efforts are central to FixO3. Combined with the procedural and technological harmonisation, tackled in separate work packages, the FixO3 network of observatories will efficiently and cost effectively provide a consistent resource of quality controlled accessible oceanographic data The project website www.fixo3.eu is being developed as both a data showcase and single distribution point, and with database driven tools will enable the sharing of information between the observatories in the most smart and cost effective way. The network of knowledge built throughout the project will become a legacy resource that will ensure access to the unique ensemble data sets only achievable at these key observatories.

Pagnani, Maureen; Huber, Robert; Lampitt, Richard

2014-05-01

474

Dark Forces Searches in Fixed Target Experiments  

NASA Astrophysics Data System (ADS)

Searches for physics Beyond the Standard Model (BSM) can be carried out with precise and GeV-energy-range experiments. In many string theories, a Hidden Sector, decoupled to the SM, foresees the existence of a new massive boson, the A? or heavy photon, that weakly couples to the electromagnetic current. A new particle with mass in the range of 1 MeV - 1 GeV could explain many astro-particle observations (e.g. positron excess seen by PAMELA and AMS experiments) and some anomalies not yet fully understood (e.g. muon g - 2 factor). The search for A? has motivated intense experimental activities in almost every accelerator facility using different techniques: colliding beam, fixed target experiments, meson rare decays. Jefferson Lab, a world-leading nuclear physics laboratory, is planning a set of fixed target experiments aiming to discover the A? or set new limits in its mass and coupling, with an unprecedented sensitivity and reach capability. In this contribution, after reviewing the physics case and some experimental evidences, I will report on the program of measurements planned at Jefferson Lab for the next years.

Battaglieri, M.

2014-12-01

475

47 CFR 15.307 - Coordination with fixed microwave service.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Coordination with fixed microwave service. 15.307 Section 15.307... § 15.307 Coordination with fixed microwave service. (a) UTAM, Inc. is...band from the Private Operational-Fixed Microwave Service (OFS) operating under...

2010-10-01

476

33 CFR 118.65 - Lights on fixed bridges.  

Code of Federal Regulations, 2014 CFR

...2014-07-01 2014-07-01 false Lights on fixed bridges. 118.65 Section...LIGHTING AND OTHER SIGNALS § 118.65 Lights on fixed bridges. (a) Each fixed...will be marked by a range of two green lights, and each margin of each navigable...

2014-07-01

477

48 CFR 931.102 - Fixed-price contracts.  

Code of Federal Regulations, 2014 CFR

...2014-10-01 false Fixed-price contracts. 931.102 Section...Regulations System DEPARTMENT OF ENERGY GENERAL CONTRACTING REQUIREMENTS...Applicability 931.102 Fixed-price contracts. The intent of... (a) Pricing fixed-price prime contracts and...

2014-10-01

478

Clinical trials in crisis: Four simple methodologic fixes.  

PubMed

There is growing consensus that the US clinical trials system is broken, with trial costs and complexity increasing exponentially, and many trials failing to accrue. Yet, concerns about the expense and failure rate of randomized trials are only the tip of the iceberg; perhaps what should worry us most is the number of trials that are not even considered because of projected costs and poor accrual. Several initiatives, including the Clinical Trials Transformation Initiative and the "Sensible Guidelines Group" seek to push back against current trends in clinical trials, arguing that all aspects of trials-including design, approval, conduct, monitoring, analysis, and dissemination-should be based on evidence rather than contemporary norms. Proposed here are four methodologic fixes for current clinical trials. The first two aim to simplify trials, reducing costs, and increasing patient acceptability by dramatically reducing eligibility criteria-often to the single criterion that the consenting physician is uncertain which of the two randomized arms is optimal-and by clinical integration, investment in data infrastructure to bring routinely collected data up to research grade to be used as endpoints in trials. The second two methodologic fixes aim to shed barriers to accrual, either by cluster randomization of clinicians (in the case of modifications to existing treatment) or by early consent, where patients are offered the chance of being randomly selected to be offered a novel intervention if disease progresses at a subsequent point. Such solutions may be partial, or result in a new set of problems of their own. Yet, the current crisis in clinical trials mandates innovative approaches: randomized trials have resulted in enormous benefits for patients, and we need to ensure that they continue to do so. PMID:25278228

Vickers, Andrew J

2014-12-01

479

Autoparallels From a New Action Principle  

E-print Network

We present a simpler and more powerful version of the recently-discovered action principle for the motion of a spinless point particle in spacetimes with curvature and torsion. The surprising feature of the new principle is that an action involving only the metric can produce an equation of motion with a torsion force, thus changing geodesics to autoparallels. This additional torsion force arises from a noncommutativity of variations with parameter derivatives of the paths due to the closure failure of parallelograms in the presence of torsion

H. Kleinert; A. Pelster

1999-10-13

480

Torus action on the moduli spaces of torsion plane sheaves of multiplicity four  

NASA Astrophysics Data System (ADS)

We describe the torus fixed locus of the moduli space of stable sheaves with Hilbert polynomial 4m+1 on P2. We determine the torus representation of the tangent spaces at the fixed points, which leads to the computation of the Betti and Hodge numbers of the moduli space.

Choi, Jinwon; Maican, Mario

2014-09-01

481

Using Technology to Unify Geometric Theorems about the Power of a Point  

ERIC Educational Resources Information Center

In this article, I describe a classroom investigation in which a group of prospective secondary mathematics teachers discovered theorems related to the power of a point using "The Geometer's Sketchpad" (GSP). The power of a point is defines as follows: Let "P" be a fixed point coplanar with a circle. If line "PA" is a secant line that intersects…

Contreras, Jose N.

2011-01-01

482

LATTICE POINT COUNTING AND HEIGHT BOUNDS OVER NUMBER FIELDS AND QUATERNION ALGEBRAS  

E-print Network

LATTICE POINT COUNTING AND HEIGHT BOUNDS OVER NUMBER FIELDS AND QUATERNION ALGEBRAS LENNY of bounded height over number fields, counting points of bounded height over positive definite quaternion algebras, and counting points of bounded height with a fixed support over global function fields. Our

Fukshansky, Lenny

483

Analysis of cache-related preemption delay in fixed-priority preemptive scheduling  

Microsoft Academic Search

We propose a technique for analyzing cache-related preemption delays of tasks that cause unpredictable variation in task execution time in the context of fixed-priority preemptive scheduling. The proposed technique consists of two steps. The first step performs a per-task analysis to estimate cache-related preemption cost for each execution point in a given task. The second step computes the worst case

Chang-gun Lee; Joosun Hahn; Sang Lyul Min; Rhan Ha; Seongsoo Hong; Chang Yun Park; Minsuk Lee; Chong-sang Kim

1996-01-01

484

Analysis of Cache-Related Preemption Delay in Fixed-Priority Preemtive Scheduling  

Microsoft Academic Search

We propose a technique for analyzing cache-related preemption delays of tasks that cause unpredictable variation in task execution time in the context of fixed-priority preemptive scheduling. The proposed technique consists of two steps. The first step performs a per-task analysis to estimate cache-related preemption cost for each execution point in a given task. The second step computes the worst case

Chang-gun Lee; Joosun Hahn; Yang-min Seo; Sang Lyul Min; Rhan Ha; Seongsoo Hong; Chang Yun Park; Minsuk Lee; Chong-sang Kim

1998-01-01

485

Enhanced analysis of cache-related preemption delay in fixed-priority preemptive scheduling  

Microsoft Academic Search

We propose a technique for analyzing cache-related preemption delays of tasks that cause unpredictable variation in task execution time in the context of fixed-priority preemptive scheduling. The proposed technique consists of two steps. The first step performs a per-task analysis to estimate cache-related preemption cost for each execution point in a given task. The second step computes the worst case

Chang-Gun Leet; Joosun Hahn; Yang-min Seo; Sang Lyul Min; Rhan Ha; Seongsoo Hong; Chang Yun Park; Minsuk Lee; Chong-sang Kim

1997-01-01

486

A Conductivity Approach to Measuring Fixed Charge Density in Intervertebral Disc Tissue  

Microsoft Academic Search

A new method for measuring the fixed charge density (FCD) in intervertebral disc (IVD) tissues employing a two-point electrical\\u000a conductivity approach was developed. In this technique, the tissue is first confined and equilibrated in a potassium chloride\\u000a (KCl) solution, and the tissue conductivity is then measured. This is then repeated with a second concentration of KCl solution.\\u000a The FCD can

Alicia R. Jackson; Tai-Yi Yuan; Chun-Yuh Huang; Wei Yong Gu

2009-01-01

487

77 FR 23432 - Radio Broadcasting Services; Asbury and Maquoketa, IA, and Mineral Point, WI  

Federal Register 2010, 2011, 2012, 2013, 2014

...Radio Broadcasting Services; Asbury and Maquoketa, IA, and Mineral Point, WI AGENCY: Federal Communications Commission. ACTION...Independence, LLC, proposing the allotment of Channel 238A at Mineral Point, Wisconsin, and the substitution of reserved...

2012-04-19

488

STUDIES ON ENZYME ACTION  

PubMed Central

The saccharogenic enzymes present in potato juice were studied. The actions were followed upon the substances present in the juice and upon added sucrose, maltose, and soluble starch. Sucrase and amylase were found to be present in the juice. No indication of a maltase was obtained. The sucrase showed optimum conditions for action at pH 4 to 5, the amylase at pH 6 to 7, both upon the starch present in the juice and upon added soluble starch. The action of a yeast sucrase preparation upon the juice showed the presence of sucrose (or raffinose) in a concentration of the order of magnitude of 1 per cent. PMID:19871804

McGuire, Grace; Falk, K. George

1920-01-01

489

STUDIES ON ENZYME ACTION  

PubMed Central

A number of different methods of treatment of unripe and ripe bananas for the purpose of obtaining and studying sucrolytic and amylolytic enzymes are described. No conclusive evidence of the presence of an amlyase could be obtained in any of the preparations. The sucrase of unripe and ripe bananas was studied more extensively. With ripe bananas, both soluble and insoluble sucrase preparations were obtained. Conditions for converting the soluble into an insoluble form were found. The actions of the sucrase preparations as far as the hydrogen ion concentration for maximum action and the time-action relation are concerned are similar to the behavior of the yeast and the potato sucrase. PMID:19871890

Falk, K. George; McGuire, Grace

1921-01-01

490

Finite Temperature Effective Actions  

E-print Network

We present, from first principles, a direct method for evaluating the exact fermion propagator in the presence of a general background field at finite temperature, which can be used to determine the finite temperature effective action for the system. As applications, we determine the complete one loop finite temperature effective actions for 0+1 dimensional QED as well as the Schwinger model. These effective actions, which are derived in the real time (closed time path) formalism, generate systematically all the Feynman amplitudes calculated in thermal perturbation theory and also show that the retarded (advanced) amplitudes vanish in these theories.

Ashok Das; J. Frenkel

2009-07-30

491

Proactive action preparation: seeing action preparation as a continuous and proactive process.  

PubMed

In this paper, we aim to elucidate the processes that occur during action preparation from both a conceptual and a computational point of view. We first introduce the traditional, serial model of goal-directed action and discuss from a computational viewpoint its subprocesses occurring during the two phases of covert action preparation and overt motor control. Then, we discuss recent evidence indicating that these subprocesses are highly intertwined at representational and neural levels, which undermines the validity of the serial model and points instead to a parallel model of action specification and selection. Within the parallel view, we analyze the case of delayed choice, arguing that action preparation can be proactive, and preparatory processes can take place even before decisions are made. Specifically, we discuss how prior knowledge and prospective abilities can be used to maximize utility even before deciding what to do. To support our view, we present a computational implementation of (an approximated version of) proactive action preparation, showing its advantages in a simulated tennis-like scenario. PMID:22643383

Pezzulo, Giovanni; Ognibene, Dimitri

2012-07-01

492

How Humans Optimize Their Interaction with the Environment: The Impact of Action Context on Human Perception  

NASA Astrophysics Data System (ADS)

Humans have developed various mechanisms to optimize interaction with the environment. Optimization of action planning requires efficient selection of action-relevant features. Selection might also depend on the environmental context in which an action takes place. The present study investigated how action context influences perceptual processing in action planning. The experimental paradigm comprised two independent tasks: (1) a perceptual visual search task and (2) a grasping or a pointing movement. Reaction times in the visual search task were measured as a function of the movement type (grasping vs. pointing) and context complexity (context varying along one dimension vs. context varying along two dimensions). Results showed that action context influenced reaction times, which suggests a close bidirectional link between action and perception as well as an impact of environmental action context on perceptual selection in the course of action planning. Such findings are discussed in the context of application for robotics.

Wykowska, Agnieszka; Maldonado, Alexis; Beetz, Michael; Schubö, Anna

493

Points, Lines, and Planes  

NSDL National Science Digital Library

This lesson will define the important basics of Geometry: Points, Lines, and Planes Let's take notes on our first lesson! Click on the link below to get started: Points, Lines, and Planes Now, here is an activity to check your understanding: Points, Lines and Planes Activity OK! Now, here is a quiz to really see if you got it: Points, Lines, and Planes Quiz! Good Job! Now, your homework can be found on your Canvas account or my website calendar on ...

Neubert, Mrs.

2011-08-18

494

77 FR 25131 - Turning Point Solar LLC: Notice of Finding of No Significant Impact  

Federal Register 2010, 2011, 2012, 2013, 2014

...INFORMATION: Turning Point Solar proposes to construct a 49.9 MW solar generating facility...installation of high-efficiency monocrystalline photovoltaic...panels mounted on fixed solar racking equipment...Columbus Southern Power Company and Ohio...

2012-04-27

495

CRYSTALLOGRAPHIC POINT AND SPACE  

E-print Network

CRYSTALLOGRAPHIC POINT AND SPACE GROUPS Andy Elvin June 10, 2013 #12;Contents Point and Space no reflection axes #12;Cube and Octahedron are dual Symmetries under Oh #12;Space Groups Subgroups of E(3) Point Group + Translation { R | 0 }{ E | t }a = { R | t }a = Ra + t 230 Space Groups 73 symmorphic space

California at Santa Cruz, University of

496

Point processes, spatialtemporal  

E-print Network

­time or spatio-temporal point process) is a random collection of points, where each point rep- resents the time and location of an event. Examples of events include incidence of disease, sightings or births of a species County, CA, recorded by the Los Angeles County Department of Public Works (times of the events not shown

Schoenberg, Frederic Paik (Rick)

497

Immunization Action Coalition  

MedlinePLUS

... IAC | Contact | A-Z Index | Donate | Shop | SUBSCRIBE Immunization Action Coalition Handouts for Patients & Staff A-Z ... Index Supplies Checklist Administering Vaccines Temperature Logs Adult Vaccination Topics of Interest Documenting Vaccination Translations Parent Handouts ...

498

CLOSEOUT REPORT REMEDIAL ACTION  

E-print Network

FINAL CLOSEOUT REPORT REMEDIAL ACTION AREA OF CONCERN 6 BUILDING 650 RECLAMATION FACILITY SUMP CLOSEOUT REPORT TABLE OF CONTENTS 1.0 Introduction.....................................................................................................7 2.5 Field Screening Methods Prior and During Excavation

499

Specific site involvement in fixed drug eruption.  

PubMed

A total of 105 patients with established fixed drug eruption (FDE) by oral provocation were evaluated with regard to a drug-related site involvement. Cotrimoxazole was the leading causative agent (63.8%), followed by naproxen sodium (23.8%), dipyrone (5.7%), oxicams (4.8%) and other rare causes (1.9%). Cotrimoxazole most frequently induced lesions on genital mucosa; naproxen and oxicams on lips; and dipyrone on trunk and extremities. Isolated FDE on male genitalia (n = 16) was exclusively because of cotrimoxazole. A highly significant association could be established between naproxen and FDE on lips (chi-square = 28.3; corrected P =.000002). As this study represents the largest series of patients with naproxen-induced FDE, we would suggest that naproxen should be considered as an important potential cause of FDE on lips. PMID:14639376

Ozkaya-Bayazit, Esen

2003-12-01

500

Galvanic gold plating for fixed dental prosthesis.  

PubMed

Metal ceramic partial fixed dental prostheses have been commonly used for the replacement of missing teeth for many years. Because of an increase in the price of gold, base metal alloys have been the choice of alloy for the fabrication of metal ceramic restorations in many dental clinics. Some major disadvantages of base metals are their corrosion and the dark coloration they may cause at the crown margins. This article describes a galvanic gold-plating technique, which is used to minimize corrosion and improve the esthetics of metal ceramic restorations fabricated with Cr-Co base metal alloys. This technique involves the deposition of a 6 ?m to 8 ?m 24 K gold layer directly onto the Cr-Co cast prosthesis framework. The technique improves metal surface properties, making them more biocompatible and usable, however, requires additional equipment and experienced laboratory technicians. Clinical studies should be performed to corroborate the long term success of this technique. PMID:24926220

Ozcelik, Tuncer Burak; Yilmaz, Burak

2013-07-01