WorldWideScience

Sample records for bumpy tori

  1. WHISTBT: a 1-1/2-D radial-transport code for bumpy tori

    International Nuclear Information System (INIS)

    The computer code WHISTBT has been developed from the Oak Ridge National Laboratory WHIST code to study radial transport in bumpy tori. The code can handle both positive and negative ad hoc electric fields for devices ranging from the size of ELMO Bumpy Torus-Scale (EBT-S) to a reactor-type device, EBT-R. Fueling can be by gas puffing or pellets; heating can be by injection of rf power or neutral beams

  2. The Bumpy Torus Experiment

    Energy Technology Data Exchange (ETDEWEB)

    Cobble, James Allen [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2016-06-09

    This document summarizes the Bumpy Torus Experiment as a viable fusion reactor concept. Conclusions reached include the following: In 30 years, order-of-magnitude technological advances have occurred in multiple areas of plasma heating and confinement. The ORNL bumpy torus of the 1970s was technology limited. Now that ITER is technology limited, an alternate concept is needed. A device built on such a concept should be current free, CW, modular, have a gentle shutdown, and demonstrable stability. The bumpy torus meets or has the potential to meet all of these criteria. Earlier, stability was not possible due to power limits; it has not been fully tested. It is time to revisit the bumpy-torus concept with a modest new machine.

  3. ELMO Bumpy Square proposal

    International Nuclear Information System (INIS)

    The ELMO Bumpy Square (EBS) concept consists of four straight magnetic mirror arrays linked by four high-field corner coils. Extensive calculations show that this configuration offers major improvements over the ELMO Bumpy Torus (EBT) in particle confinement, heating, transport, ring production, and stability. The components of the EBT device at Oak Ridge National Laboratory can be reconfigured into a square arrangement having straight sides composed of EBT coils, with new microwave cavities and high-field corners designed and built for this application. The elimination of neoclassical convection, identified as the dominant mechanism for the limited confinement in EBT, will give the EBS device substantially improved confinement and the flexibility to explore the concepts that produce this improvement. The primary goals of the EBS program are twofold: first, to improve the physics of confinement in toroidal systems by developing the concepts of plasma stabilization using the effects of energetic electrons and confinement optimization using magnetic field shaping and electrostatic potential control to limit particle drift, and second, to develop bumpy toroid devices as attractive candidates for fusion reactors. This report presents a brief review of the physics analyses that support the EBS concept, discussions of the design and expected performance of the EBS device, a description of the EBS experimental program, and a review of the reactor potential of bumpy toroid configurations. Detailed information is presented in the appendices

  4. New Lie tori from Naoi tori

    OpenAIRE

    Yoshii, Yoji

    2015-01-01

    We define general Lie tori which generalize original Lie tori. We show that a Naoi torus is a general Lie torus. We give examples and prove several properties of general Lie tori. We also review isotopies of Lie tori, and prove that a general Lie torus is, in fact, isotopic to an original Lie torus. Finally, we suggest a very simple way of defining a Lie torus corresponding to a locally extended affine root system R, which we call a Lie R-torus.

  5. Ambipolar potential formation and control in bumpy tori and mirrors

    International Nuclear Information System (INIS)

    Separate abstracts were prepared for 19 of the included papers. Some of the included papers appeared earlier in ERA. A title listing only is given for three of the papers since only an abstract is given in the conference proceedings

  6. TORIS Data Preparation Guidelines

    Energy Technology Data Exchange (ETDEWEB)

    Guinn, H.; Remson, D.

    1999-03-11

    The objective of this manual is to present guidelines and procedures for the preparation of new data for the Tertiary Oil Recovery Information System (TORIS) data base. TORIS is an analytical system currently maintained by the Department of Energy's (DOE) Bartlesville Project Office. It uses an extensive field- and reservoir-level data base to evaluate the technical and economic recovery potential of specific crude oil reservoirs.

  7. ELMO Bumpy Torus data base

    International Nuclear Information System (INIS)

    This document describes a set of computer programs developed to facilitate storage and retrieval of data generated by the ELMO Bumpy Torus (EBT) experiment. The data is stored in a collection of files which contain either raw or analyzed data from diagnostics connected to the experiment. An on-line index of steady-state machine conditions, diagnostic or analysis status information, and raw or analyzed data values unifies the file collection into a data base. The index is implemented under the System 1022 data base management system

  8. Electrostatic confinement in a bumpy torus

    International Nuclear Information System (INIS)

    In a closed-field-line device such as a bumpy torus, the combined E x B and del B drifts lead to charge separation that is balanced by the ion polarization drift. In this work, we determine self-consistent potential and density profiles and the condition for electric island formation

  9. Focal Rigidity of Flat Tori

    CERN Document Server

    Kwakkel, Ferry; Peixoto, Mauricio

    2011-01-01

    Given a closed Riemannian manifold (M, g), there is a partition \\Sigma_i of its tangent bundle TM called the focal decomposition. The sets \\Sigma_i are closely associated to focusing of geodesics of (M, g), i.e. to the situation where there are exactly i geodesic arcs of the same length joining points p and q in M. In this note, we study the topological structure of the focal decomposition of a closed Riemannian manifold and its relation with the metric structure of the manifold. Our main result is that the flat n-tori are focally rigid, in the sense that if two flat tori are focally equivalent, then the tori are isometric up to rescaling.

  10. Spacetime and orbits of bumpy black holes

    Science.gov (United States)

    Vigeland, Sarah J.; Hughes, Scott A.

    2010-01-01

    Our Universe contains a great number of extremely compact and massive objects which are generally accepted to be black holes. Precise observations of orbital motion near candidate black holes have the potential to determine if they have the spacetime structure that general relativity demands. As a means of formulating measurements to test the black hole nature of these objects, Collins and Hughes introduced “bumpy black holes”: objects that are almost, but not quite, general relativity’s black holes. The spacetimes of these objects have multipoles that deviate slightly from the black hole solution, reducing to black holes when the deviation is zero. In this paper, we extend this work in two ways. First, we show how to introduce bumps which are smoother and lead to better behaved orbits than those in the original presentation. Second, we show how to make bumpy Kerr black holes—objects which reduce to the Kerr solution when the deviation goes to zero. This greatly extends the astrophysical applicability of bumpy black holes. Using Hamilton-Jacobi techniques, we show how a spacetime’s bumps are imprinted on orbital frequencies, and thus can be determined by measurements which coherently track the orbital phase of a small orbiting body. We find that in the weak field, orbits of bumpy black holes are modified exactly as expected from a Newtonian analysis of a body with a prescribed multipolar structure, reproducing well-known results from the celestial mechanics literature. The impact of bumps on strong-field orbits is many times greater than would be predicted from a Newtonian analysis, suggesting that this framework will allow observations to set robust limits on the extent to which a spacetime’s multipoles deviate from the black hole expectation.

  11. Tori Hobune 2011 & Eesti Hobune 2011 / Krista Sepp

    Index Scriptorium Estoniae

    Sepp, Krista

    2011-01-01

    14. mail korraldas Tori Hobusekasvanduse ratsaspordiklubi XVI Tori hobuse päeva ja esimese ettapi karikasarjas Tori Hobune 2011, kus avastardi takistussõidus tegid ka eesti tõugu hobused, ning 15. mail toimus koolisõidu etapp

  12. Spacetime and orbits of bumpy black holes

    CERN Document Server

    Vigeland, Sarah J

    2009-01-01

    Our universe contains a great number of extremely compact and massive objects which are generally accepted to be black holes. Precise observations of orbital motion near candidate black holes have the potential to determine if they have the spacetime structure that general relativity demands. As a means of formulating measurements to test the black hole nature of these objects, Collins and Hughes introduced "bumpy black holes": objects that are almost, but not quite, general relativity's black holes. The spacetimes of these objects have multipoles that deviate slightly from the black hole solution, reducing to black holes when the deviation is zero. In this paper, we extend this work in two ways. First, we show how to introduce bumps which are smoother and lead to better behaved orbits than those in the original presentation. Second, we show how to make bumpy Kerr black holes -- objects which reduce to the Kerr solution when the deviation goes to zero. This greatly extends the astrophysical applicability of b...

  13. Finite wavelength stability of the bumpy theta pinch

    International Nuclear Information System (INIS)

    The stability of the bumpy theta pinch is of importance, not only because of its relevance to the Scyllac experiment but also because in any magnetic confinement scheme the use of (discrete) magnetic coils necessarily introduces bumpiness in the applied field. The long wavelength stability has been considered by Weitzner who performed a double perturbation expansion on the linearized equations of ideal MHD: first in epsilon (characterizing the long wave-length or the modes) then in delta (characterizing the bumpiness of the field lines). The stability of the finite wave-length modes by expanding (only) in the small bumpiness parameter delta is examined. Currents flow only in the ignorable theta direction. (U.K.)

  14. Magnetics calculations for an ELMO Bumpy Square

    International Nuclear Information System (INIS)

    Calculations have been carried out to determine the vacuum magnetic parameters, forces, and the use of trim coils in an ELMO Bumpy Square. A configuration having five mirror coils per side and an eight-coil high-field toroidal solenoid corner assembly was studied. Favorable magnetic parameters are achieved in the device. An on-axis mirror ratio of 1.9, a global mirror ratio of 3.6, and excellent centering of plasma pressure contours are achieved. Particle losses are also minimal (<5%). The magnetic forces acting between coils are comparable with those encountered in the EBT-I/S magnet configuration. Circular trim coils were found to be suitable for restoring hot electron ring locations that are displaced when the coil currents are varied for performing magnetic studies or for assessing the effects on the EBS of the global mirror ratio

  15. Thomson scattering on ELMO Bumpy Torus

    International Nuclear Information System (INIS)

    Below 1012 cm-3 density, a Thomson scattering experiment is an exacting task. Aside from the low signal level, the core plasma in this instance is bathed in high-energy x rays, surrounded by a glowing molecular surface plasma, and heated steady state by microwaves. This means that the noise level from radiation is high and the environment is extremely harsh-so harsh that much effort is required to overcome system damage. In spite of this, the ELMO Bumpy Torus (EBT) system has proven itself capable of providing reliable n/sub e/ and T/sub e/ measurements at densities as low as 2 x 1011 cm-3. Radial scans across 20 cm of the plasma diameter have been obtained on a routine basis, and the resulting information has been a great help in understanding confinement in the EBT plasma. The bulk electron properties are revealed as flat profiles of n/sub e/ and T/sub e/, with density ranging from 0.5 to 2.0 x 1012 cm-3 and temperature decreasing from 100 to 20 eV as pressure in the discharge is increased at constant power. Evidence is presented for a suprathermal tail, which amounts to about 10% of the electron distribution at low pressures. The validity of this conclusion is supported by two independent sensitivity calibrations

  16. ELMO Bumpy Torus Reactor (EBTR) reference design

    International Nuclear Information System (INIS)

    The goal of the ELMO Bumpy Torus Reactor (EBTR) study is the evaluation of the EBT confinement concept as the basis for development of a commercial fusion power reactor. A multidisciplinary, self-consistent treatment of EBT reactor scaling and design has been completed and a reference design (EBTR-48) has been developed. This design, based on a realistic plasma model and relatively conservative engineering parameters (i.e., 1 MW/m2 neutron wall loading and a 7.3 T maximum toroidal field), is a steady state, ignited-mode system with high plasma power density and aspect ratio. The total thermal power of EBTR-48, exclusive of blanket multiplication, is 4000 MW; the design is based on a standard module and the design power level for a particular plant is determined by the number of modules used. Several design variants have been investigated in detail to illustrate the effect of near-term and advanced technologies and to illustrate the design freedom offered by devices with low field and high aspect ratio. The high aspect ratio simplifies many aspects of the design, most notably those associated with remote maintenance, accessibility, and repair. It appears that a commercially successful EBTR could be constructed with only slight advances in existing technology, if the present understanding of the physics can be extrapolated to the reactor regime and does not differ markedly from the model developed for this study

  17. Oral Tori in Chronic Peritoneal Dialysis Patients

    Science.gov (United States)

    Hsu, Chia-Lin; Hsu, Ching-Wei; Chang, Pei-Ching; Huang, Wen-Hung; Weng, Cheng-Hao; Yang, Huang-Yu; Liu, Shou-Hsuan; Chen, Kuan-Hsing; Weng, Shu-Man; Chang, Chih-Chun; Wang, I-Kuan

    2016-01-01

    Background The pathogenesis of oral tori has long been debated and is thought to be the product of both genetic and environmental factors, including occlusal forces. Another proposed mechanism for oral tori is the combination of biomechanical forces, particularly in the oral cavity, combined with cortical bone loss and trabecular expansion, as one might see in the early stages of primary hyperparathyroidism. This study investigated the epidemiology of torus palatinus (TP) and torus mandibularis (TM) in peritoneal dialysis patients, and analyzed the influences of hyperparathyroidism on the formation of oral tori. Method In total, 134 peritoneal dialysis patients were recruited between July 1 and December 31, 2015 for dental examinations for this study. Patients were categorized into two subgroups based on the presence or absence of oral tori. Demographic, hematological, biochemical, and dialysis-related data were obtained for analysis. Results The prevalence of oral tori in our sample group was high at 42.5% (57 of 134), and most patients with oral tori were female (61.4%). The most common location of tori was TP (80.7%), followed by TP and TM (14.0%), then TM (5.3%). All 54 TP cases were at the midline, and most were <2 cm (59.3%), flat (53.7%), and located in the premolar region (40.7%). Of the 11 TM cases, all were bilateral and symmetric, mostly <2 cm (81.9%), lobular (45.4%), and located at premolar region (63.6%). Interestingly, patients with oral tori had slightly lower serum levels of intact parathyroid hormones than those without oral tori, but the difference was not statistically significant (317.3±292.0 versus 430.1±492.6 pg/mL, P = 0.126). In addition, patients with oral tori did not differ from patients without tori in inflammatory variables such as serum high sensitivity C-reactive protein levels (6.6±8.2 versus 10.3±20.2 mg/L, P = 0.147) or nutritional variables such as serum albumin levels (3.79±0.38 versus 3.77±0.45 g/dL, P = 0

  18. Oral Tori in Chronic Peritoneal Dialysis Patients.

    Directory of Open Access Journals (Sweden)

    Chia-Lin Hsu

    Full Text Available The pathogenesis of oral tori has long been debated and is thought to be the product of both genetic and environmental factors, including occlusal forces. Another proposed mechanism for oral tori is the combination of biomechanical forces, particularly in the oral cavity, combined with cortical bone loss and trabecular expansion, as one might see in the early stages of primary hyperparathyroidism. This study investigated the epidemiology of torus palatinus (TP and torus mandibularis (TM in peritoneal dialysis patients, and analyzed the influences of hyperparathyroidism on the formation of oral tori.In total, 134 peritoneal dialysis patients were recruited between July 1 and December 31, 2015 for dental examinations for this study. Patients were categorized into two subgroups based on the presence or absence of oral tori. Demographic, hematological, biochemical, and dialysis-related data were obtained for analysis.The prevalence of oral tori in our sample group was high at 42.5% (57 of 134, and most patients with oral tori were female (61.4%. The most common location of tori was TP (80.7%, followed by TP and TM (14.0%, then TM (5.3%. All 54 TP cases were at the midline, and most were <2 cm (59.3%, flat (53.7%, and located in the premolar region (40.7%. Of the 11 TM cases, all were bilateral and symmetric, mostly <2 cm (81.9%, lobular (45.4%, and located at premolar region (63.6%. Interestingly, patients with oral tori had slightly lower serum levels of intact parathyroid hormones than those without oral tori, but the difference was not statistically significant (317.3±292.0 versus 430.1±492.6 pg/mL, P = 0.126. In addition, patients with oral tori did not differ from patients without tori in inflammatory variables such as serum high sensitivity C-reactive protein levels (6.6±8.2 versus 10.3±20.2 mg/L, P = 0.147 or nutritional variables such as serum albumin levels (3.79±0.38 versus 3.77±0.45 g/dL, P = 0.790. Furthermore, there were no

  19. Quasi-periodic oscillations of perturbed tori

    Science.gov (United States)

    Parthasarathy, Varadarajan; Manousakis, Antonios; Kluźniak, Włodzimierz

    2016-05-01

    We performed axisymmetric hydrodynamical simulations of oscillating tori orbiting a non-rotating black hole. The tori in equilibrium were constructed with a constant distribution of angular momentum in a pseudo-Newtonian potential (Kluźniak-Lee). Motions of the torus were triggered by adding subsonic velocity fields: radial, vertical and diagonal to the tori in equilibrium. As the perturbed tori evolved in time, we measured L2 norm of density and obtained the power spectrum of L2 norm which manifested eigenfrequencies of tori modes. The most prominent modes of oscillation excited in the torus by a quasi-random perturbation are the breathing mode and the radial and vertical epicyclic modes. The radial and the plus modes, as well as the vertical and the breathing modes will have frequencies in an approximate 3:2 ratio if the torus is several Schwarzschild radii away from the innermost stable circular orbit. Results of our simulations may be of interest in the context of high-frequency quasi-periodic oscillations observed in stellar-mass black hole binaries, as well as in supermassive black holes.

  20. Summary of ELMO Bumpy Torus experiments from 1982 to 1984

    International Nuclear Information System (INIS)

    Experiments were conducted in the ELMO Bumpy Torus (EBT) from 1973 until 1984. A number of papers have been published on various aspects of the final two years of the EBT experiments. This report summarizes the final experimental conclusions and discusses issues that were not resolved. 46 refs., 12 figs., 1 tab

  1. Stokes flow through a tube with bumpy wall

    Science.gov (United States)

    Wang, C. Y.

    2006-07-01

    The Stokes flow through a tube with a bumpy wall is solved through a perturbation in the small amplitude of the three-dimensional bumps. The solution can be expressed in terms of modified Bessel functions. For given area or volume of a bump, there exists an optimum circumferential wave number and an optimum aspect ratio for which the flow rate is maximized.

  2. (Tory) anarchy in the UK: The very peculiar practice of tory anarchism

    OpenAIRE

    Wilkin, P.

    2009-01-01

    The idea of ‘Tory Anarchism’ is reasonably well known but largely unanalysed in either popular or academic literature. Tory Anarchism refers to a group of apparently disparate figures in English popular and political culture whose work has, in part, satirised key British institutions and social relations. At the same time they also provide interesting insights into questions of British, though predominantly English, identity, by focusing upon issues of class, empire and nation. This article ...

  3. Liouville quantum gravity on complex tori

    Energy Technology Data Exchange (ETDEWEB)

    David, François [Institut de Physique Théorique, CNRS, URA 2306, CEA, IPhT, Gif-sur-Yvette (France); Rhodes, Rémi [Université Paris-Est Marne la Vallée, LAMA, Champs sur Marne (France); Vargas, Vincent [ENS Paris, DMA, 45 rue d’Ulm, 75005 Paris (France)

    2016-02-15

    In this paper, we construct Liouville Quantum Field Theory (LQFT) on the toroidal topology in the spirit of the 1981 seminal work by Polyakov [Phys. Lett. B 103, 207 (1981)]. Our approach follows the construction carried out by the authors together with Kupiainen in the case of the Riemann sphere [“Liouville quantum gravity on the Riemann sphere,” e-print arXiv:1410.7318]. The difference is here that the moduli space for complex tori is non-trivial. Modular properties of LQFT are thus investigated. This allows us to integrate the LQFT on complex tori over the moduli space, to compute the law of the random Liouville modulus, therefore recovering (and extending) formulae obtained by physicists, and make conjectures about the relationship with random planar maps of genus one, eventually weighted by a conformal field theory and conformally embedded onto the torus.

  4. Liouville quantum gravity on complex tori

    Science.gov (United States)

    David, François; Rhodes, Rémi; Vargas, Vincent

    2016-02-01

    In this paper, we construct Liouville Quantum Field Theory (LQFT) on the toroidal topology in the spirit of the 1981 seminal work by Polyakov [Phys. Lett. B 103, 207 (1981)]. Our approach follows the construction carried out by the authors together with Kupiainen in the case of the Riemann sphere ["Liouville quantum gravity on the Riemann sphere," e-print arXiv:1410.7318]. The difference is here that the moduli space for complex tori is non-trivial. Modular properties of LQFT are thus investigated. This allows us to integrate the LQFT on complex tori over the moduli space, to compute the law of the random Liouville modulus, therefore recovering (and extending) formulae obtained by physicists, and make conjectures about the relationship with random planar maps of genus one, eventually weighted by a conformal field theory and conformally embedded onto the torus.

  5. Liouville quantum gravity on complex tori

    International Nuclear Information System (INIS)

    In this paper, we construct Liouville Quantum Field Theory (LQFT) on the toroidal topology in the spirit of the 1981 seminal work by Polyakov [Phys. Lett. B 103, 207 (1981)]. Our approach follows the construction carried out by the authors together with Kupiainen in the case of the Riemann sphere [“Liouville quantum gravity on the Riemann sphere,” e-print arXiv:1410.7318]. The difference is here that the moduli space for complex tori is non-trivial. Modular properties of LQFT are thus investigated. This allows us to integrate the LQFT on complex tori over the moduli space, to compute the law of the random Liouville modulus, therefore recovering (and extending) formulae obtained by physicists, and make conjectures about the relationship with random planar maps of genus one, eventually weighted by a conformal field theory and conformally embedded onto the torus

  6. Line emission from optically thick relativistic accretion tori

    OpenAIRE

    Fuerst, Steven V.; Wu, Kinwah

    2007-01-01

    We calculate line emission from relativistic accretion tori around Kerr black holes and investigate how the line profiles depend on the viewing inclination, spin of the central black hole, parameters describing the shape of the tori, and spatial distribution of line emissivity on the torus surface. We also compare the lines with those from thin accretion disks. Our calculations show that lines from tori and lines from thin disks share several common features. In particular, at low and moderat...

  7. ELMO Bumpy Torus fusion-reactor design study

    International Nuclear Information System (INIS)

    A complete power plant design of a 1200-MWe ELMO Bumpy Torus Reactor (EBTR) is described. Those features that are unique to the EBT confinement concept are emphasized, with subsystems and balance-of-plant items that are generic to magnetic fusion being adopted from past, more extensive tokamak reactor designs. This overview paper stresses the design philosophy and asumptions that led to an economic, 35-m major-radius design that at 1.4 MW/m2 wall loading generates 4000 MWt with a 15% recirculating power fraction

  8. Singular limit cycle bifurcations to closed orbits and invariant tori

    International Nuclear Information System (INIS)

    This paper investigates singular limit cycle bifurcations for a singularly perturbed system. Based on a series of transformations (the modified curvilinear coordinate, blow-up, and near-identity transformation) and bifurcation theory of periodic orbits and invariant tori, the bifurcations of closed orbits and invariant tori near singular limit cycles are discussed

  9. Singular limit cycle bifurcations to closed orbits and invariant tori

    Energy Technology Data Exchange (ETDEWEB)

    Ye Zhiyong [Department of Mathematics, Shanghai Jiaotong University, Shanghai 200240 (China); Department of Mathematics, Chongqing Institute of Technology, Chongqing 400050 (China); E-mail: yezhiyong@sjtu.edu.cn; Han Maoan [Department of Mathematics, Shanghai Jiaotong University, Shanghai 200240 (China); E-mail: mahan@sjtu.edu.cn

    2006-02-01

    This paper investigates singular limit cycle bifurcations for a singularly perturbed system. Based on a series of transformations (the modified curvilinear coordinate, blow-up, and near-identity transformation) and bifurcation theory of periodic orbits and invariant tori, the bifurcations of closed orbits and invariant tori near singular limit cycles are discussed.

  10. Curved noncommutative tori as Leibniz quantum compact metric spaces

    Energy Technology Data Exchange (ETDEWEB)

    Latrémolière, Frédéric, E-mail: frederic@math.du.edu [Department of Mathematics, University of Denver, Denver, Colorado 80208 (United States)

    2015-12-15

    We prove that curved noncommutative tori are Leibniz quantum compact metric spaces and that they form a continuous family over the group of invertible matrices with entries in the image of the quantum tori for the conjugation by modular conjugation operator in the regular representation, when this group is endowed with a natural length function.

  11. A program to develop advanced EBT [ELMO Bumpy Torus] concepts and international collaboration on the Bumpy Torus concept: Final report

    International Nuclear Information System (INIS)

    This project was undertaken to develop innovative concepts for improving the performance of ELMO Bumpy Torus devices in those aspects of plasma confinement that are particularly relevant to an eventual EBT reactor concept. These include effective magnetic utilization using Andreoletti coils, enhanced confinement using positive ambipolar potentials, and attractive divertor concepts that are compatible with formation and maintenance of ELMO rings. Each of the three major objectives was achieved and, except for the divertor studies, documented for publication and presentation at major scientific meetings. This report provides a brief recapitulation of the major results achieved in the form of a collection of those publications, together with this Introduction

  12. Charged tori in spherical gravitational and dipolar magnetic fields

    CERN Document Server

    Slany, P; Stuchlik, Z; Karas, V

    2013-01-01

    A Newtonian model of non-conductive, charged, perfect fluid tori orbiting in combined spherical gravitational and dipolar magnetic fields is presented and stationary, axisymmetric toroidal structures are analyzed. Matter in such tori exhibits a purely circulatory motion and the resulting convection carries charges into permanent rotation around the symmetry axis. As a main result, we demonstrate the possible existence of off-equatorial charged tori and equatorial tori with cusps enabling outflows of matter from the torus also in the Newtonian regime. These phenomena represent qualitatively a new consequence of the interplay between gravity and electromagnetism. From an astrophysical point of view, our investigation can provide insight into processes that determine the vertical structure of dusty tori surrounding accretion disks.

  13. CHARGED TORI IN SPHERICAL GRAVITATIONAL AND DIPOLAR MAGNETIC FIELDS

    Energy Technology Data Exchange (ETDEWEB)

    Slany, P.; Kovar, J.; Stuchlik, Z. [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava Bezrucovo nam. 13, CZ-746 01 Opava (Czech Republic); Karas, V., E-mail: petr.slany@fpf.slu.cz [Astronomical Institute, Academy of Sciences, Bocni II, Prague CZ-141 31 (Czech Republic)

    2013-03-01

    A Newtonian model of non-conductive, charged, perfect fluid tori orbiting in combined spherical gravitational and dipolar magnetic fields is presented and stationary, axisymmetric toroidal structures are analyzed. Matter in such tori exhibits a purely circulatory motion and the resulting convection carries charges into permanent rotation around the symmetry axis. As a main result, we demonstrate the possible existence of off-equatorial charged tori and equatorial tori with cusps that also enable outflows of matter from the torus in the Newtonian regime. These phenomena qualitatively represent a new consequence of the interplay between gravity and electromagnetism. From an astrophysical point of view, our investigation can provide insight into processes that determine the vertical structure of dusty tori surrounding accretion disks.

  14. Performance of a 12-coil superconducting 'bumpy torus' magnet facility.

    Science.gov (United States)

    Roth, J. R.; Holmes, A. D.; Keller, T. A.; Krawczonek, W. M.

    1972-01-01

    The NASA-Lewis 'bumpy torus' facility consists of 12 superconducting coils, each 19 cm ID and capable of 3.0 tesla on their axes. The coils are equally spaced around a toroidal array with a major diameter of 1.52 m, and are mounted with the major axis of the torus vertical in a single vacuum tank 2.6 m in diameter. Final shakedown tests of the facility mapped out its magnetic, cryogenic, vacuum, mechanical, and electrical performance. The facility is now ready for use as a plasma physics research facility. A maximum magnetic field on the magnetic axis of 3.23 teslas has been held for a period of more than sixty minutes without a coil normalcy.

  15. ELMO Bumpy Torus Reactor and power plant: conceptual design study

    International Nuclear Information System (INIS)

    A complete power plant design of a 1200-MWe ELMO Bumpy Torus Reactor (EBTR) is presented. An emphasis is placed on those features that are unique to the EBT confinement concept, with subsystems and balance-of-plant items that are more generic to magnetic fusion being adapted from past, more extensive tokamak reactor designs. Similar to the latter tokamak studies, this conceptual EBTR design also emphasizes the use of conventional or near state-of-the-art engineering technology and materials. An emphasis is also placed on system accessibility, reliability, and maintainability, as these crucial and desirable characteristics relate to the unique high-aspect-ratio configuration of EBTs. Equal and strong emphasis is given to physics, engineering/technology, and costing/economics components of this design effort. Parametric optimizations and sensitivity studies, using cost-of-electricity as an object function, are reported. Based on these results, the direction for future improvement on an already attractive reactor design is identified

  16. Transient waveform acquisition system for the ELMO Bumpy Torus

    International Nuclear Information System (INIS)

    The transient waveform system described in this report is designed to acquire analog waveforms from the ELMO Bumpy Torus (EBT) diagnostic experiments. Pressure, density, synchrotron radiation, etc., are acquired and digitized with a Kinetic Systems TR812 transient recorder and associated modules located in a CAMAC crate. The system can simultaneously acquire, display, and transmit sets of data consisting of identification parameters and up to 1024 data points for 1 to 64 input signals (frequency range = 0.01 pulse/s to 100 kHz) of data every one or more minutes; thus, it can run continuously without operator intervention. The data are taken on a VAX 11/780 and transmitted to a data base on a DECSystem-10. To aid the programmer in making future modifications to the system, detailed documentation using the Yourdon structural methods has been given

  17. Theoretical studies of Elmo Bumpy Torus. Annual report

    International Nuclear Information System (INIS)

    The work was divided into four basic areas. Studies of the effect of waves on stability and transport considered the possibility of using radio frequency waves to stabilize interchange modes, as well as the general problem of influencing plasma transport by wave absorption. Studies related to wave heating of plasmas considered nonlinear effects such as mode conversion and parametric absorption, along with studies of the structure of ion cyclotron waves in a strongly bumpy geometry. Ring physics studies added nonadiabaticity and whistler instabilities to the model, producing a fairly realistic picture of energy balance, power requirements, and scaling for hot electron rings. Finally, studies analyzing EBT transport data were performed, with emphasis on testing various hypotheses for apparent anomalies in the EBT

  18. Three-dimensional tori and Arnold tongues

    Science.gov (United States)

    Sekikawa, Munehisa; Inaba, Naohiko; Kamiyama, Kyohei; Aihara, Kazuyuki

    2014-03-01

    This study analyzes an Arnold resonance web, which includes complicated quasi-periodic bifurcations, by conducting a Lyapunov analysis for a coupled delayed logistic map. The map can exhibit a two-dimensional invariant torus (IT), which corresponds to a three-dimensional torus in vector fields. Numerous one-dimensional invariant closed curves (ICCs), which correspond to two-dimensional tori in vector fields, exist in a very complicated but reasonable manner inside an IT-generating region. Periodic solutions emerge at the intersections of two different thin ICC-generating regions, which we call ICC-Arnold tongues, because all three independent-frequency components of the IT become rational at the intersections. Additionally, we observe a significant bifurcation structure where conventional Arnold tongues transit to ICC-Arnold tongues through a Neimark-Sacker bifurcation in the neighborhood of a quasi-periodic Hopf bifurcation (or a quasi-periodic Neimark-Sacker bifurcation) boundary.

  19. Three-dimensional tori and Arnold tongues

    Energy Technology Data Exchange (ETDEWEB)

    Sekikawa, Munehisa, E-mail: sekikawa@cc.utsunomiya-u.ac.jp [Department of Mechanical and Intelligent Engineering, Utsunomiya University, Utsunomiya-shi 321-8585 (Japan); Inaba, Naohiko [Organization for the Strategic Coordination of Research and Intellectual Property, Meiji University, Kawasaki-shi 214-8571 (Japan); Kamiyama, Kyohei [Department of Electronics and Bioinformatics, Meiji University, Kawasaki-shi 214-8571 (Japan); Aihara, Kazuyuki [Institute of Industrial Science, the University of Tokyo, Meguro-ku 153-8505 (Japan)

    2014-03-15

    This study analyzes an Arnold resonance web, which includes complicated quasi-periodic bifurcations, by conducting a Lyapunov analysis for a coupled delayed logistic map. The map can exhibit a two-dimensional invariant torus (IT), which corresponds to a three-dimensional torus in vector fields. Numerous one-dimensional invariant closed curves (ICCs), which correspond to two-dimensional tori in vector fields, exist in a very complicated but reasonable manner inside an IT-generating region. Periodic solutions emerge at the intersections of two different thin ICC-generating regions, which we call ICC-Arnold tongues, because all three independent-frequency components of the IT become rational at the intersections. Additionally, we observe a significant bifurcation structure where conventional Arnold tongues transit to ICC-Arnold tongues through a Neimark-Sacker bifurcation in the neighborhood of a quasi-periodic Hopf bifurcation (or a quasi-periodic Neimark-Sacker bifurcation) boundary.

  20. Modular Curvature for Noncommutative Two-Tori

    CERN Document Server

    Connes, Alain

    2011-01-01

    Starting from the description of the conformal geometry of noncommutative 2-tori in the framework of modular spectral triples, we explicitly compute the local curvature functionals determined by the value at zero of the zeta functions affiliated with these spectral triples. We give a closed formula for the Ray-Singer analytic torsion in terms of the Dirichlet quadratic form and the generating function for Bernoulli numbers applied to the modular operator. The gradient of the Ray-Singer analytic torsion is then expressed in terms of these functionals, and yields the analogue of scalar curvature. Computing this gradient in two ways elucidates the meaning of the complicated two variable functions occurring in the formula for the scalar curvature. Moreover, the corresponding evolution equation for the metric produces the appropriate analogue of Ricci curvature. We prove the analogue of the classical result which asserts that in every conformal class the maximum value of the determinant of the Laplacian on metrics...

  1. Toris väärtustub ameeriklaste panus / Silvia Paluoja

    Index Scriptorium Estoniae

    Paluoja, Silvia, 1956-

    2010-01-01

    President Toomas Hendrik Ilves ja Ameerika Ühendriikide suursaadik Michael C. Polt avasid 22. juunil 2010. a. Tori alevikus Eesti Sõjameeste Mälestuskirikus mälestusplaadi Ameerika Ühendriikide kodanikest Vabadusristi kavaleridele

  2. On Lower Dimensional Invariant Tori in Cd Reversible Systems

    Institute of Scientific and Technical Information of China (English)

    Jing ZHANG

    2008-01-01

    In this paper,a result on the persistence of lowner dimensional invariant tori in Cd reversible systems is obtained under some conditions.The theorem is proved for any d which is larger than some consts.

  3. Rational points of bounded height on compactifications of anisotropic tori

    CERN Document Server

    Batyrev, V V; Batyrev, Victor V; Tschinkel, Yuri

    1994-01-01

    We investigate the analytic properties of the zeta-function associated with heights on equivariant compactifications of anisotropic tori over number fields. This allows to verify conjectures about the distribution of rational points of bounded height.

  4. Tori hobuse mitu palet ja ametit / Vivika Veski

    Index Scriptorium Estoniae

    Veski, Vivika

    2008-01-01

    Tori hobusekasvandus pürib turismiäri ja toetuste abiga üle-eestilise haardega tõuaretuskeskuseks. Küsimusele, mida arvate plaanist luua Torisse hobuste aretamise keskus, vastavad Peep Puna ja Raigo Kollom

  5. Surface flute modes in the bumpy magnetic field

    International Nuclear Information System (INIS)

    Surface electromagnetic waves are often determined as the most possible cause of undesirable heating of edge plasma that leads, in turn, to strengthening of plasma - wall interaction in stellarators and increased plasma contamination. The propagation of surface flute modes near the interface of plasma column separated by a vacuum layer from the ring cylindrical ideally conductive metallic chamber is studied. The external steady bumpy magnetic field B-vector0 = B0ze-vectorz + B0re-vectorr was considered, B0z=B00[1+εm(r)cos(kmz)], here εm'≡dεm/dr, km=2π/L, L is the period of nonuniformity. non-uniformity of B-vector0 is planned to be dominant in the confining magnetic field of the modular stellarator Helias, εm ∼ 0.13. In the bumpy magnetic field the electromagnetic disturbance propagates in the form of the wave envelope, in which one alongside with the fundamental harmonic, proportional to exp[i(mθ±-ωt)], infinite set of satellite spatial harmonics, proportional to exp[i(mθ ± jkmz - ωt)], j=1,2,3..., is present. It is shown, that in the first approximation in the respect to εm, amplitudes of the fundamental harmonics of the E-wave with the field components Er, Eθ, Bz do not vary, small satellite harmonics of these fields arise, proportional to exp[i(mθ ± kmz - ωt)]. At the same time due to weak coupling of - and - modes, caused by B-vector0 nonuniformity and nonzero axial wave number of satellite harmonics, small satellite harmonics of H-wave with the field components Ez, Br, Bθ also arise. The amplitudes of satellite harmonics of E-wave are shown to be symmetric: Er(+)=Er(-), Eθ(+)=Eθ(-), Bz(+)=Bz(-), and the amplitudes of H-wave are antisymmetric: Br(+)=-Br(-), Bθ(+)=- Bθ(-), Ez(+)=-Ez(-). In the second approximation in the respect to εm corrections to the amplitudes of the fundamental harmonic of E-wave arise. The correction to the eigen frequency of the wave, caused by the nonuniformity of B-vector0, appears to be the small value of the

  6. Normal linear stability of quasi-periodic tori

    Science.gov (United States)

    Broer, H. W.; Hoo, J.; Naudot, V.

    We consider families of dynamical systems having invariant tori that carry quasi-periodic motions. Our interest is the persistence of such tori under small, nearly-integrable perturbations. This persistence problem is studied in the dissipative, the Hamiltonian and the reversible setting, as part of a more general KAM theory for classes of structure preserving dynamical systems. This concerns the parametrized KAM theory as initiated by Moser [J.K. Moser, On the theory of quasiperiodic motions, SIAM Rev. 8 (2) (1966)145-172; J.K. Moser, Convergent series expansions for quasi-periodic motions, Math. Ann. 169 (1967) 136-176] and further developed in [G.B. Huitema, Unfoldings of quasi-periodic tori, PhD thesis, University of Groningen, 1988; H.W. Broer, G.B. Huitema, F. Takens, Unfoldings of quasi-periodic tori, Mem. Amer. Math. Soc. 83 (421) (1990) 1-82; H.W. Broer, G.B. Huitema, Unfoldings of quasi-periodic tori in reversible systems, J. Dynam. Differential Equations 7 (1) (1995) 191-212]. The corresponding nondegeneracy condition involves certain (trans-)versality conditions on the normal linear, leading, part at the invariant tori. We show that as a consequence, a Cantor family of Diophantine tori with positive Hausdorff measure is persistent under nearly-integrable perturbations. This result extends the above references since presently the case of multiple Floquet exponents is included. Our leading example is the normal 1 :-1 resonance, which occurs a lot in applications, both Hamiltonian and reversible. As an illustration of this we briefly describe the Lagrange top coupled to an oscillator.

  7. Performance of a 12-coil superconducting bumpy torus magnet facility

    Science.gov (United States)

    Roth, J. R.; Holmes, A. D.; Keller, T. A.; Krawczonek, W. M.

    1972-01-01

    The bumpy torus facility consists of 12 superconducting coils, each 19 cm i.d. and capable of 3.0 teslas on their axes. The coils are equally spaced around a toroidal array with a major diameter of 1.52 m, and are mounted with the major axis of the torus vertical in a single vacuum tank 2.6 m in diameter. Final shakedown tests of the facility mapped out its magnetic, cryogenic, vacuum, mechanical, and electrical performance. The facility is now ready for use as a plasma physics research facility. A maximum magnetic field on the magnetic axis of 3.23 teslas was held for a period of more than sixty minutes without a coil normalcy. The design field was 3.00 teslas. The steady-state liquid helium boil-off rate was 87 liters per hour of liquid helium without the coils charged. The coil array was stable when subjected to an impulsive loading, even with the magnets fully charged. When the coils were charged to a maximum magnetic field of 3.35 teslas, the system was driven normal without damage.

  8. Radial transport in the ELMO Bumpy Torus in collisionless regimes

    International Nuclear Information System (INIS)

    One important area of disagreement between radial transport theory and the ELMO Bumpy Torus experiment (EBT) has been the degree of collisionality of the toroidal plasma electrons. Experiment shows relatively warm electrons (kT/sub e/ approx. 300 to 600 eV) and collisionless scaling, that is, energy confinement increasing with temperature. But results of early one-dimensional (1-D), neoclassical transport models with radially inward pointing electric fields are limited to relatively cool electrons (kT/sub e/ approx. 100 to 200 eV) and collisional scaling. In this paper these early results are extended to include lowest order effects of ion diffusion in regions where poloidal drift frequencies are small. Effects of direct, or nondiffusive, losses in such regions are neglected. Results show that solutions in the collisionless regime do exist. Furthermore, when effects of finite electron ring beta on magnetic fields near the plasma edge are included, these solutions occur at power levels consistent with experiment

  9. Invariant tori for a class of nonlinear evolution equations

    International Nuclear Information System (INIS)

    The paper looks at quite a wide class of nonlinear evolution equations in a Banach space, including the typical boundary value problems for the main wave equations in mathematical physics (the telegraph equation, the equation of a vibrating beam, various equations from the elastic stability and so on). For this class of equations a unified approach to the bifurcation of invariant tori of arbitrary finite dimension is put forward. Namely, the problem of the birth of such tori from the zero equilibrium is investigated under the assumption that in the stability problem for this equilibrium the situation arises close to an infinite-dimensional degeneracy. Bibliography: 28 titles

  10. Mind the Resonances: Final stages of accretion into bumpy black holes

    International Nuclear Information System (INIS)

    In this article we discuss a possible way of testing the Kerr black hole hypothesis by taking advantage of phenomena correlated with chaotic motion in the final stages of an accretion disk around a bumpy black hole. We anticipate that these phenomena should have an imprint in the electromagnetic spectrum coming from the accretion disk

  11. Roles of bumpy field on collisionless particle confinement in helical axis heliotrons

    International Nuclear Information System (INIS)

    The roles of 'bumpy' field on collisionless particle confinement in helical axis heliotrons are investigated with model magnetic field and particle orbit calculations in Boozer co-ordinates. The mod Bmin contours can be shifted in the major radius direction with control of the bumpy field, where Bmin is the minimum value of vertical bar B vertical bar in the toroidal direction within one field period. The area of closed mod Bmin contours is a useful measure with which to evaluate global collisionless particle confinement as long as the mod Bmin contours connect toroidally. The negative value of the ratio between the bumpy component and the helicity component contributes to obtaining the largest area of closed mod Bmin contours for a finite ratio between the toroidicity component and the helicity component. The radially increasing bumpy field contributes to the realization of a toroidally localized mod Bmin structure. It also produces a region with a large derivative of vertical bar B vertical bar with respect to the toroidal magnetic flux, which is well aligned to the toroidally localized mod Bmin structure. This enhances the large poloidal drift of the guiding centre orbits, while the radial drift is unaffected, effectively improving the particle confinement. (author)

  12. The bumpy road of liberalisation of the Dutch Energy Market. Expectations versus the hardships of reality

    International Nuclear Information System (INIS)

    In June 2006 a study was finalized on the Liberalisation of the Dutch Energy Market. The European Commission decided to liberalise the European energy industry, the Netherlands taking the lead. The Dutch electricity and natural gas industries fell prey to a bumpy road of liberalization; initial expectations have proven to be overly optimistic

  13. Küsimuste tulv automaksu teel / Villem Tori

    Index Scriptorium Estoniae

    Tori, Villem

    2008-01-01

    Eesti Autoettevõtete Liidu direktor Villem Tori imestab sotsiaaldemokraatide automaksu idee üle, sest kordagi pole öeldud, mida sellest maksust laekuva rahaga teha soovitakse. Vt. samas: Võimalik automaks. Kommenteerivad võimlemisklubi Janika juht Janika Mölder ja suusatreener Mati Alaver

  14. Erakordne jumalateenistus Eesti Sõjameeste Mälestuskirikus Toris / Kuno Raude

    Index Scriptorium Estoniae

    Raude, Kuno

    2010-01-01

    22. juunil 2010. a. Toris Eesti Sõjameeste Mälestuskirikus toimunud jumalateenistusest, millest võttis osa ka president Toomas Hendrik Ilves. Eesti riigipea avas koos USA suursaadikuga Eestis Michael C. Polt'iga Ameerika Ühendriikide kodanikest Vabadusristi kavaleridele pühendatud mälestusplaadi

  15. Line Emission from Optically Thick RelativisticAccretion Tori

    Energy Technology Data Exchange (ETDEWEB)

    Fuerst, Steven V.; /KIPAC, Menlo Park /Mullard Space Sci. Lab.; Wu, Kinwah; /Mullard Space Sci. Lab.

    2007-09-14

    We calculate line emission from relativistic accretion tori around Kerr black holes and investigate how the line profiles depend on the viewing inclination, spin of the central black hole, parameters describing the shape of the tori, and spatial distribution of line emissivity on the torus surface. We also compare the lines with those from thin accretion disks. Our calculations show that lines from tori and lines from thin disks share several common features. In particular, at low and moderate viewing inclination angles they both have asymmetric double-peaked profiles with a tall, sharp blue peak and a shorter red peak which has an extensive red wing. At high viewing inclination angles they both have very broad, asymmetric lines which can be roughly considered as single-peaked. Torus and disk lines may show very different red and blue line wings, but the differences are due to the models for relativistic tori and disks having differing inner boundary radii. Self-eclipse and lensing play some role in shaping the torus lines, but they are effective only at high inclination angles. If inner and outer radii of an accretion torus are the same as those of an accretion disk, their line profiles show substantial differences only when inclination angles are close to 90{sup o}, and those differences are manifested mostly at the central regions of the lines instead of the wings.

  16. Line emission from optically thick relativistic accretion tori

    CERN Document Server

    Fuerst, Steven V

    2007-01-01

    We calculate line emission from relativistic accretion tori around Kerr black holes and investigate how the line profiles depend on the viewing inclination, spin of the central black hole, parameters describing the shape of the tori, and spatial distribution of line emissivity on the torus surface. We also compare the lines with those from thin accretion disks. Our calculations show that lines from tori and lines from thin disks share several common features. In particular, at low and moderate viewing inclination angles they both have asymmetric double-peaked profiles with a tall, sharp blue peak and a shorter red peak which has an extensive red wing. At high viewing inclination angles they both have very broad, asymmetric lines which can be roughly considered single-peaked. Torus and disk lines may show very different red and blue line wings, but the differences are due to the models for relativistic tori and disks having differing inner boundary radii. Self-eclipse and lensing play some role in shaping the ...

  17. Scale invariant Strichartz estimates on tori and applications

    OpenAIRE

    Killip, Rowan; Visan, Monica

    2014-01-01

    We prove scale-invariant Strichartz inequalities for the Schrodinger equation on rectangular tori (rational or irrational) in all dimensions. We use these estimates to give a unified and simpler treatment of local well-posedness of the energy-critical nonlinear Schrodinger equation in dimensions three and four.

  18. Once-punctured tori and knots in lens spaces

    OpenAIRE

    Baker, Kenneth L.

    2006-01-01

    We determine the non-null homologous knots in lens spaces whose exteriors contain properly embedded once-punctured tori. All such knots arise as surgeries on the Whitehead link and are grid number 1 in their lens spaces. As a corollary, we classify once-punctured torus bundles that admit a lens space filling.

  19. Perfect fluid tori orbiting Kehagias-Sfetsos naked singularities

    Science.gov (United States)

    Stuchlík, Z.; Pugliese, D.; Schee, J.; Kučáková, H.

    2015-09-01

    We construct perfect fluid tori in the field of the Kehagias-Sfetsos (K-S) naked singularities. These are spherically symmetric vacuum solutions of the modified Hořava quantum gravity, characterized by a dimensionless parameter ω M^2, combining the gravitational mass parameter M of the spacetime with the Hořava parameter ω reflecting the role of the quantum corrections. In dependence on the value of ω M^2, the K-S naked singularities demonstrate a variety of qualitatively different behavior of their circular geodesics that is fully reflected in the properties of the toroidal structures, demonstrating clear distinction to the properties of the torii in the Schwarzschild spacetimes. In all of the K-S naked singularity spacetimes the tori are located above an "antigravity" sphere where matter can stay in a stable equilibrium position, which is relevant for the stability of the orbiting fluid toroidal accretion structures. The signature of the K-S naked singularity is given by the properties of marginally stable tori orbiting with the uniform distribution of the specific angular momentum of the fluid, l= const. In the K-S naked singularity spacetimes with ω M^2 > 0.2811, doubled tori with the same l= const can exist; mass transfer between the outer torus and the inner one is possible under appropriate conditions, while only outflow to the outer space is allowed in complementary conditions. In the K-S spacetimes with ω M^2 < 0.2811, accretion from cusped perfect fluid tori is not possible due to the non-existence of unstable circular geodesics.

  20. Perfect fluid tori orbiting Kehagias-Sfetsos naked singularities

    Energy Technology Data Exchange (ETDEWEB)

    Stuchlik, Z.; Pugliese, D.; Schee, J.; Kucakova, H. [Silesian University in Opava, Faculty of Philosophy and Science, Institute of Physics and Research Centre of Theoretical Physics and Astrophysics, Opava (Czech Republic)

    2015-09-15

    We construct perfect fluid tori in the field of the Kehagias-Sfetsos (K-S) naked singularities. These are spherically symmetric vacuum solutions of the modified Horava quantum gravity, characterized by a dimensionless parameter ωM{sup 2}, combining the gravitational mass parameter M of the spacetime with the Horava parameter ω, reflecting the role of the quantum corrections. In dependence on the value of ωM{sup 2}, the K-S naked singularities demonstrate a variety of qualitatively different behavior of their circular geodesics that is fully reflected in the properties of the toroidal structures, demonstrating clear distinction to the properties of the torii in the Schwarzschild spacetimes. In all of the K-S naked singularity spacetimes the tori are located above an @gantigravity@h sphere where matter can stay in a stable equilibrium position, which is relevant for the stability of the orbiting fluid toroidal accretion structures. The signature of the K-S naked singularity is given by the properties of marginally stable tori orbiting with the uniform distribution of the specific angular momentum of the fluid, l = const. In the K-S naked singularity spacetimes with ωM{sup 2} > 0.2811, doubled tori with the same l = const can exist; mass transfer between the outer torus and the inner one is possible under appropriate conditions, while only outflow to the outer space is allowed in complementary conditions. In the K-S spacetimes with ωM{sup 2} < 0.2811, accretion from cusped perfect fluid tori is not possible due to the non-existence of unstable circular geodesics. (orig.)

  1. Perfect fluid tori orbiting Kehagias-Sfetsos naked singularities

    International Nuclear Information System (INIS)

    We construct perfect fluid tori in the field of the Kehagias-Sfetsos (K-S) naked singularities. These are spherically symmetric vacuum solutions of the modified Horava quantum gravity, characterized by a dimensionless parameter ωM2, combining the gravitational mass parameter M of the spacetime with the Horava parameter ω, reflecting the role of the quantum corrections. In dependence on the value of ωM2, the K-S naked singularities demonstrate a variety of qualitatively different behavior of their circular geodesics that is fully reflected in the properties of the toroidal structures, demonstrating clear distinction to the properties of the torii in the Schwarzschild spacetimes. In all of the K-S naked singularity spacetimes the tori are located above an @gantigravity@h sphere where matter can stay in a stable equilibrium position, which is relevant for the stability of the orbiting fluid toroidal accretion structures. The signature of the K-S naked singularity is given by the properties of marginally stable tori orbiting with the uniform distribution of the specific angular momentum of the fluid, l = const. In the K-S naked singularity spacetimes with ωM2 > 0.2811, doubled tori with the same l = const can exist; mass transfer between the outer torus and the inner one is possible under appropriate conditions, while only outflow to the outer space is allowed in complementary conditions. In the K-S spacetimes with ωM2 < 0.2811, accretion from cusped perfect fluid tori is not possible due to the non-existence of unstable circular geodesics. (orig.)

  2. Oscillations of radiation pressure supported tori near black holes

    CERN Document Server

    Mazur, Grzegorz P; Sądowski, Aleksander; Mishra, Bhupendra; Kluźniak, Włodek

    2015-01-01

    We study the dynamics of radiation pressure supported tori around Schwarzschild black holes, focusing on their oscillatory response to an external perturbation. Using KORAL, a general relativistic radiation hydrodynamics code capable of modeling all radiative regimes from the optically thick to the optically thin, we monitor a sample of models at different initial temperatures and opacities, evolving them in two spatial dimensions for $\\sim 165$ orbital periods. The dynamics of models with high opacity is very similar to that of purely hydrodynamics models, and it is characterized by regular oscillations which are visible also in the light curves. As the opacity is decreased, the tori quickly and violently migrate towards the gas-pressure dominated regime, collapsing towards the equatorial plane. When the spectra of the $L_2$ norm of the mass density are considered, high frequency inertial-acoustic modes of oscillations are detected (with the fundamental mode at a frequency $68 M_{\\rm BH}^{-1}\\,\\rm Hz$), in c...

  3. Mechanisms of Stochastic Diffusion of Energetic Ions in Spherical Tori

    International Nuclear Information System (INIS)

    Stochastic diffusion of the energetic ions in spherical tori is considered. The following issues are addressed: (I) Goldston-White-Boozer diffusion in a rippled field; (ii) cyclotron-resonance-induced diffusion caused by the ripple; (iii) effects of non-conservation of the magnetic moment in an axisymmetric field. It is found that the stochastic diffusion in spherical tori with a weak magnetic field has a number of peculiarities in comparison with conventional tokamaks; in particular, it is characterized by an increased role of mechanisms associated with non-conservation of the particle magnetic moment. It is concluded that in current experiments on National Spherical Torus eXperiment (NSTX) the stochastic diffusion does not have a considerable influence on the confinement of energetic ions

  4. Perfect fluid tori orbiting Kehagias-Sfetsos naked singularities

    CERN Document Server

    Stuchlík, Zdeněk; Schee, Jan; Kučáková, Hana

    2014-01-01

    We construct perfect fluid tori in the field of the Kehagias-Sfetsos (K-S) naked singularity representing spherically symmetric vacuum solution of the modified Ho\\v{r}ava quantum gravity that is characterized by a dimensionless parameter $\\omega M^2$, combining the gravitational mass parameter $M$ of the spacetime with the Ho\\v{r}ava parameter $\\omega$ reflecting the role of the quantum corrections. In dependence on the value of $\\omega M^2$, the K-S naked singularities demonstrate a variety of qualitatively different behavior of their circular geodesics that is fully reflected in the properties of the toroidal structures. In all of the K-S naked singularity spacetimes the tori are located above an "antigravity" sphere where matter can stay in stable equilibrium position, that is relevant for the stability of the orbiting fluid toroidal accretion structures.

  5. Classification of knotted tori in 2-metastable dimension

    KAUST Repository

    Cencelj, Matija

    2012-11-30

    This paper is devoted to the classical Knotting Problem: for a given manifold N and number m describe the set of isotopy classes of embeddings N → Sm. We study the specific case of knotted tori, that is, the embeddings Sp × Sq → Sm. The classification of knotted tori up to isotopy in the metastable dimension range m > p + 3 2 q + 2, p 6 q, was given by Haefliger, Zeeman and A. Skopenkov. We consider the dimensions below the metastable range and give an explicit criterion for the finiteness of this set of isotopy classes in the 2-metastable dimension: Theorem. Assume that p+ 4 3 q +2 < mp+ 3 2 q +2 and m > 2p+q +2. Then the set of isotopy classes of smooth embeddings Sp × Sq → Sm is infinite if and only if either q + 1 or p + q + 1 is divisible by 4. © 2012 RAS(DoM) and LMS.

  6. Circular geodesics and thick tori around rotating boson stars

    CERN Document Server

    Meliani, Z; Grandclément, P; Gourgoulhon, E; Monceau-Baroux, R; Straub, O

    2015-01-01

    Accretion disks play an important role in the evolution of their relativistic inner compact objects. The emergence of a new generation of interferometers will allow to resolve these accretion disks and provide more information about the properties of the central gravitating object. Due to this instrumental leap forward it is crucial to investigate the accretion disk physics near various types of inner compact objects now to deduce later constraints on the central objects from observations. A possible candidate for the inner object is the boson star. Here, we will try to analyze the differences between accretion structures surrounding boson stars and black holes. We aim at analysing the physics of circular geodesics around boson stars and study simple thick accretion tori (so-called Polish doughnuts) in the vicinity of these stars. We realize a detailed study of the properties of circular geodesics around boson stars. We then perform a parameter study of thick tori with constant angular momentum surrounding bo...

  7. Existence of Invariant Tori for Certain Weakly Reversible Mappings

    Institute of Scientific and Technical Information of China (English)

    Bao She WEI

    2002-01-01

    In this paper, we consider certain mappings, M, sufficiently close to an integrable one,which is weakly reversible with respect to the mappings G sufficiently close to an involution of type(m, n), where m,n ∈ Z+ are arbitrary. Under some weak non-degeneracy condition, we constructa uniform KAM iteration for proving the existence of a Cantor family of m-tori invariant under thereversible mappings M and the reversing mapping G.

  8. Quasi-periodicity in relative quasi-periodic tori

    Science.gov (United States)

    Fassò, Francesco; García-Naranjo, Luis C.; Giacobbe, Andrea

    2015-10-01

    At variance from the cases of relative equilibria and relative periodic orbits of dynamical systems with symmetry, the dynamics in relative quasi-periodic tori (namely, subsets of the phase space that project to an invariant torus of the reduced system on which the flow is quasi-periodic) is not yet completely understood. Even in the simplest situation of a free action of a compact and abelian connected group, the dynamics in a relative quasi-periodic torus is not necessarily quasi-periodic. It is known that quasi-periodicity of the unreduced dynamics is related to the reducibility of the reconstruction equation, and sufficient conditions for it are virtually known only in a perturbation context. We provide a different, though equivalent, approach to this subject, based on the hypothesis of the existence of commuting, group-invariant lifts of a set of generators of the reduced torus. Under this hypothesis, which is shown to be equivalent to the reducibility of the reconstruction equation, we give a complete description of the structure of the relative quasi-periodic torus, which is a principal torus bundle whose fibers are tori of a dimension which exceeds that of the reduced torus by at most the rank of the group. The construction can always be done in such a way that these tori have minimal dimension and carry ergodic flow.

  9. A 12-coil superconducting 'bumpy torus' magnet facility for plasma research.

    Science.gov (United States)

    Roth, J. R.; Holmes, A. D.; Keller, T. A.; Krawczonek, W. M.

    1972-01-01

    A retrospective summary is presented of the performance of the two-coil superconducting pilot rig which preceded the NASA Lewis bumpy torus. The NASA Lewis bumpy torus facility consists of 12 superconducting coils, each with a 19 cm i.d. and capable of producing magnetic field strengths of 3.0 teslas on their axes. The magnets are equally spaced around a major circumference 1.52 m in diameter, and are mounted with the major axis of the torus vertical in a single vacuum tank 2.59 m in diameter. The design value of maximum magnetic field on the magnetic axis (3.0 T) has been reached and exceeded.

  10. Toroidal magnet system conceptual design for the ELMO Bumpy Torus Reactor

    Energy Technology Data Exchange (ETDEWEB)

    Luton, Jr, J. N.; Yeh, H. T.

    1977-01-01

    The ELMO Bumpy Torus Reactor (EBTR) is a fusion reactor device based on the concept of toroidally linked mirrors. To minimize engineering uncertainties, the EBTR superconducting magnet system is designed so that it could be built with existing or near-term technology. The design uses identical coils in standard modules, thus facilitating commercialization. The reference design uses 48 modules and produces 4000 MW(th).

  11. Oscillations of radiation pressure supported tori near black holes

    Science.gov (United States)

    Mazur, Grzegorz P.; Zanotti, Olindo; Sądowski, Aleksander; Mishra, Bhupendra; Kluźniak, Wlodek

    2016-03-01

    We study the dynamics of radiation pressure supported tori around Schwarzschild black holes, focusing on their oscillatory response to an external perturbation. Using KORAL, a general relativistic radiation-hydrodynamics code capable of modelling all radiative regimes from the optically thick to the optically thin, we monitor a sample of models at different initial temperatures and opacities, evolving them in two spatial dimensions for ˜165 orbital periods. The dynamics of models with high opacity is very similar to that of purely hydrodynamics models, and it is characterized by regular oscillations which are visible also in the light curves. As the opacity is decreased, the tori quickly and violently migrate towards the gas-pressure dominated regime, collapsing towards the equatorial plane. When the spectra of the L2 norm of the mass density are considered, high-frequency inertial-acoustic modes of oscillations are detected (with the fundamental mode at a frequency 68 M_BH^{-1} Hz), in close analogy to the phenomenology of purely hydrodynamic models. An additional mode of oscillation, at a frequency 129 M_BH^{-1} Hz, is also found, which can be unambiguously attributed to the radiation. The spectra extracted from the light curves are typically noisier, indicating that in a real observation such modes may not be easily detected.

  12. Observation of hot-electron ring instabilities in ELMO Bumpy Torus

    International Nuclear Information System (INIS)

    A high-frequency hot electron instability is observed in ELMO Bumpy Torus (EBT) plasmas when the hot electron-to-ion density ratio exceeds 0.4. Both the real frequency and the imaginary frequency are larger than the ion cyclotron frequency. The azimuthal mode number (m) is 7, and the instability rotates in the hot electron curvature drift direction. This instability is identified as a curvature-driven mode. When it is strongly excited, the equilibrium of the hot electron annuli and confined core plasmas are destroyed (disruption). Extensive ion heating and neutron bursts are associated with this instability

  13. Greene’s residue criterion for the breakup of invariant tori of volume-preserving maps

    Science.gov (United States)

    Fox, Adam M.; Meiss, James D.

    2013-01-01

    Invariant tori play a fundamental role in the dynamics of symplectic and volume-preserving maps. Codimension-one tori are particularly important as they form barriers to transport. Such tori foliate the phase space of integrable, volume-preserving maps with one action and d angles. For the area-preserving case, Greene’s residue criterion is often used to predict the destruction of tori from the properties of nearby periodic orbits. Even though KAM theory applies to the three-dimensional case, the robustness of tori in such systems is still poorly understood. We study a three-dimensional, reversible, volume-preserving analogue of Chirikov’s standard map with one action and two angles. We investigate the preservation and destruction of tori under perturbation by computing the “residue” of nearby periodic orbits. We find tori with Diophantine rotation vectors in the “spiral mean” cubic algebraic field. The residue is used to generate the critical function of the map and find a candidate for the most robust torus.

  14. REGIMUL JURIDIC AL BILETULUI DE CĂLĂTORIE ELECTRONIC

    Directory of Open Access Journals (Sweden)

    Dumitriţa BAEŞU

    2016-03-01

    Full Text Available În articol sunt scoase în relief principalele repere conceptuale ce se ataşează problematicii cu privire la coraportul biletului de călătorie electronic în transportul auto de călători şi bagaje şi în transportul aerian. Este fundamentată teza, potrivit căreia sistemul de taxare electronic în cadrul prestării serviciilor de transport este deosebit de important şi nece­sar în contextul racordării legislaţiei naţionale la cerinţele Uniunii Europene. De asemenea, se menţionează că reforma în cazul respectiv este oportună şi inevitabilă, deoarece una dintre condiţiile cerute de Uniunea Europeană pentru integrarea Republicii Moldova în acest sistem constă în armonizarea legislaţiei privind transportul la standardele europene. Nu în ultimul rând, este formulată concluzia, potrivit căreia achiziţionarea biletelor de călătorie electronice a devenit mult mai comodă, economă şi accesibilă.                                                                                   LEGAL REGIME OF THE ELECTRONIC TRAVEL TICKET                                               In the article are pointed out major conceptual aspects that are a added to issues on the ticket correlation of road transport of passengers electronic ticket and luggage in air transport. It is fundamental thesis that the electronic toll system in transport services is particularly important and necessary in the context of adjusting the national legislation to the European Union standards. Also in this case, is mentioned that reform is appropriate and inevitable, because one of the conditions required by the EU for Moldova's integration into the system is to harmonize transport legislation with European standards. Finally, as conclusion, electronic travel ticket purchasing has become more convenient, cheap and affordable. 

  15. A vast amount of various invariant tori in the Nosé-Hoover oscillator

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Lei [School of Mathematics and Statistics, Huazhong University of Science and Technology, Wuhan 430074 (China); Department of Mathematics and Physics, Hefei University, Hefei 230601 (China); Yang, Xiao-Song, E-mail: yangxs@hust.edu.cn [School of Mathematics and Statistics, Huazhong University of Science and Technology, Wuhan 430074 (China)

    2015-12-15

    This letter restudies the Nosé-Hoover oscillator. Some new averagely conservative regions are found, each of which is filled with different sequences of nested tori with various knot types. Especially, the dynamical behaviors near the border of “chaotic region” and conservative regions are studied showing that there exist more complicated and thinner invariant tori around the boundaries of conservative regions bounded by tori. Our results suggest an infinite number of island chains in a “chaotic sea” for the Nosé-Hoover oscillator.

  16. A 12 coil superconducting bumpy torus magnet facility for plasma research

    Science.gov (United States)

    Roth, J. R.; Holmes, A. D.; Keller, T. A.; Krawczonek, W. M.

    1972-01-01

    A summary is presented of the performance of the two-coil superconducting pilot rig which preceded the NASA Lewis bumpy torus. This pilot rig was operated for 550 experimental runs over a period of 7 years. The NASA Lewis bumpy torus facility consists of 12 superconducting coils, each with a 19 cm in diameter and capable of producing magnetic field strengths of 3.0 teslas on their axes. The magnets are equally spaced around a major circumference 1.52 m in diameter, and are mounted with the major axis of the torus vertical in a single vacuum tank 2.59 m in diameter. The design value of maximum magnetic field on the magnetic axis (3.0 teslas) was reached and exceeded. A maximum magnetic field of 3.23 teslas was held for a period of 60 minutes, and the coils did not go to normal. When the coils were charged to a maximum magnetic field of 3.35 teslas, the coil system was driven normal without damage to the facility.

  17. A Bumpy Border Crossing into the Teaching Culture on a U.S. Campus: Experience of a Chinese Faculty Member

    Science.gov (United States)

    Cheng, Qiang; Wang, Jian; Zhang, Shaoan

    2013-01-01

    Guided by cultural border crossing and teacher identity development theories, this case study explores the bumpy process of a junior Chinese faculty member's border crossing into the U.S. teaching culture and analyzes the challenges, coping strategies, and consequences of his border crossing on teaching and teacher identity development. The…

  18. Nonsymmetric systems arising in the computation of invariant tori

    Energy Technology Data Exchange (ETDEWEB)

    Trummer, M.R. [Simons Fraser Univ., Burnaby, British Columbia (Canada)

    1996-12-31

    We introduce two new spectral implementations for computing invariant tori. The underlying nonlinear partial differential equation although hyperbolic by nature, has periodic boundary conditions in both space and time. In our first approach we discretize the spatial variable, and find the solution via a shooting method. In our second approach, a full two-dimensional Fourier spectral discretization and Newton`s method lead to very large, sparse, nonsymmetric systems. These matrices are highly structured, but the sparsity pattern prohibits the use of direct solvers. A modified conjugate gradient type iterative solver appears to perform best for this type of problems. The two methods are applied to the van der Pol oscillator, and compared to previous algorithms. Several preconditioners are investigated.

  19. Low-energy capture of asteroids onto KAM tori

    CERN Document Server

    Verrier, Patricia E

    2015-01-01

    We present a new method for engineering the artificial capture of asteroids. Based on theories of the chaos-assisted capture of natural satellites of the giant planets, we show how an unbound asteroid that passes close to a regular region of phase space can be easily moved onto the nearby KAM tori and essentially permanently captured with the Earth's Hill sphere without closing the zero velocity curves. The method has the advantages of a relatively low delta-v requirement and no need for control strategies. An illustration of the method is given for an example asteroid trajectory, demonstrating that it is a viable strategy for the final capture stage of asteroids in the Earth's neighbourhood.

  20. Constructive spherical codes on layers of flat tori

    CERN Document Server

    Torezzan, Cristiano; Vaishampayan, Vinay A

    2012-01-01

    A new class of spherical codes is constructed by selecting a finite subset of flat tori from a foliation of the unit sphere S^{2L-1} of R^{2L} and designing a structured codebook on each torus layer. The resulting spherical code can be the image of a lattice restricted to a specific hyperbox in R^L in each layer. Group structure and homogeneity, useful for efficient storage and decoding, are inherited from the underlying lattice codebook. A systematic method for constructing such codes are presented and, as an example, the Leech lattice is used to construct a spherical code in R^{48}. Upper and lower bounds on the performance, the asymptotic packing density and a method for decoding are derived.

  1. Dynamical supersymmetry breaking on magnetized tori and orbifolds

    CERN Document Server

    Abe, Hiroyuki; Sumita, Keigo

    2016-01-01

    We construct several dynamical supersymmetry breaking (DSB) models within a single ten-dimensional supersymmetric Yang-Mills (SYM) theory, compactified on magnetized tori with or without orbifolding. We study the case that the supersymmetry breaking is triggered by a strong dynamics of $SU(N_C)$ SYM theory with $N_F$ flavors contained in the four-dimensional effective theory. We show several configurations of magnetic fluxes and orbifolds, those potentially yield, below the compactification scale, the field contents and couplings required for triggering DSB. We especially find a class of self-complete DSB models on orbifolds, where all the extra fields are eliminated by the orbifold projection and DSB successfully occurs within the given framework. Comments on some perspectives for associating the obtained DSB models with the other sectors, such as the visible sector and another hidden sector for, e.g., stabilizing moduli, are also given.

  2. The existence of periodic orbits and invariant tori for some 3-dimensional quadratic systems.

    Science.gov (United States)

    Jiang, Yanan; Han, Maoan; Xiao, Dongmei

    2014-01-01

    We use the normal form theory, averaging method, and integral manifold theorem to study the existence of limit cycles in Lotka-Volterra systems and the existence of invariant tori in quadratic systems in ℝ(3). PMID:24982980

  3. Lax representation for two-particle dynamics splitting on two tori

    CERN Document Server

    Enolskii, V Z; Enolskii, Victor; Salerno, Mario

    1996-01-01

    Lax representation in terms of 2\\times 2 matrices is constructed for a separable multiply--periodic system splitting on two tori. Hyperelliptic Kleinian functions and their reduction to elliptic functions are used.

  4. Tinker, Tory, Wobbler, why? The political economy of electricity restructuring in Ontario, 1995--2003

    Science.gov (United States)

    Martin, Charles Francis James

    The Ontario Tories' 42-year hegemony in government (1943-1985) was wrought through clever policies which often utilized Crown institutions to promote prosperity or to oblige or mollify vying interests. Ousted in 1985, though, they used their time in opposition to revise the Tory doctrine. In the 1995 election, the Tories emerged a tougher, more truculent group quite unlike their predecessors. Campaigning on their Common Sense Revolution (CSR) platform, they promised to eliminate red tape and vowed to obliterate all ostensible economic barriers which were impeding commerce in the province. In the CSR, the Tories identified Ontario Hydro (OH), the province's lauded publicly-owned power monopoly, as a troublesome and inefficient Crown entity which required fundamental reform. Portions of OH, they hinted, would likely be sold. Once elected, the Tories worked hurriedly to demolish OH and destroy public power in Ontario. For nearly 100 years, OH proved a pivotal component within the province's political economy for its provision of affordable, reliable power and its function as a policy tool to incite and direct development. A Tory government fought to instigate public power in the early 1900s and, in the late 1900s, a Tory government was fighting vigorously to rescind it. Why would they now renounce Crown power? It is the intent of this thesis to elucidate the Tory government's involvement in the transformation of Ontario's electricity industry from 1995 to 2003. Distinguishing electricity as a special, strategic staple, this thesis uses a pro-state, pro-staples industry political economy approach to discern how and why the Tory government sought to restructure the electricity sector. Essentially, it posits that the onslaught of neoliberalism, the emergence of novel generating technology, and the faltering of OH's nuclear wing all had a huge part to play in provoking the Tory government to initiate its reforms. Their reforms, though, proved too hasty, haughty, and

  5. Excitation of lower-hybrid waves by the rf heating of Elmo Bumpy Torus scale

    International Nuclear Information System (INIS)

    The substantial ion heating of toroidal plasmas at rf frequencies between the ion-cyclotron and lower-hybrid frequencies suggests that some additional process or processes must supplement conventional harmonic ion-cyclotron coupling of wave energy to particles. It is proposed in this paper that superthermal lower-hybrid turbulence excited because of the harmonic oscillating two-stream instability could contribute in a significant way to this observed heating. The threshold field strength for such a process to occur in the Elmo Bumpy Torus scale is calculated. Specific tests of the theory, measurement of an enhanced lower-hybrid and quasimode spectrum, particularly at harmonics of the pump frequency, are indicated. The impact of the harmonic oscillating two-stream instability as allowing rf heating at frequencies a factor of 2 or 3 below the lower-hybrid frequency is described

  6. Staircase model for magnetohydrodynamic spectrum and global instabilities in the Elmo bumpy torus

    International Nuclear Information System (INIS)

    In the staircase model a continuous equilibrium is approximated by a discontinuous one with jump surfaces separating regions of constant pressure, density, and magnetic rotation number. The dispersion relation, giving the growth rates or frequencies of eigenmodes of the linearized motion as solutions of a finite matrix eigenvalue problem, is derived for arbitrary axisymmetric straight staircase equilibria with no azimuthal magnetic field and with weak, long, and thin periodic mirrors. This relation is shown to describe global modes accurately, thus being well suited to obtaining their dependence upon the pressure and density profile with minimal numerical effort. Application to hollow pressure profiles typical of the Elmo bumpy torus yields global instabilities with growth rates too large to be compatible with observations, indicating that kinetic effects must be invoked to explain even the large-scale behavior of this device

  7. Nuclear performance calculations for the ELMO Bumpy Torus Reactor (EBTR) reference design

    International Nuclear Information System (INIS)

    The nuclear performance of the ELMO Bumpy Torus Reactor reference design has been calculated using the one-dimensional discrete ordinates code ANISN and the latest available ENDF/B-IV transport cross-section data and nuclear response functions. The calculated results include estimates of the spatial and integral heating rate with emphasis on the recovery of fusion neutron energy in the blanket assembly and minimization of the energy deposition rates in the cryogenic magnet coil assemblies. The tritium breeding ratio in the natural lithium-laden blanket was calculated to be 1.29 tritium nuclei per incident neutron. The radiation damage in the reactor structural material and in the magnet assembly is also given

  8. Electron temperature measurements from induced toroidal current in ELMO Bumpy Torus-Scale

    International Nuclear Information System (INIS)

    We have carried out measurements on ELMO Bumpy Torus-Scale (EBT-S) to estimate the electron temperature of the toroidal plasma by inducing a small (approx. 2-A) fluctuating (5-Hz) ac toroidal current. The modulating frequency used is low enough to minimize the effects of cavity skin time (approx. 100 ms) and plasma inductance. We have calculated the temperature from the measured values of the current obtained by use of the Rogowsky loop at various fill pressures at 100 kW with 28-GHz operation. The electron temperature has been estimated to be around 80 to 90 eV with an error of about 10 to 25% in the low T-mode, which is in good agreement with the Thomson scattering measurements

  9. Study of plasma confinement in ELMO Bumpy Torus with a heavy-ion beam probe

    International Nuclear Information System (INIS)

    Plasma confinement in ELMO Bumpy Torus (EBT) is generally strongly dependent on an ambipolar electric field. Spatially resolved measurements of the resulting electric space potential phi/sub sp/ have been made in a single plasma cross section by the heavy-ion beam probe. This diagnostic injects a 4-60-keV beam of (usually) Cs+ ions into the plasma. Measurement of the energy of Cs2+ secondary ions leaving the plasma gives a continuous monitor of the local space potential. In addition, the total detected Cs2+ ion current is proportional to the product of the local electron density and the ionization rate, which, in turn, is a function of the electron temperature. This signal, nf(T/sub e/), is sensitive to all three electron distributions found in EBT - those of the cold surface plasma, the warm core plasma, and the hot electron ring

  10. MHD phenomena and transport of energetic ions in spherical tori

    International Nuclear Information System (INIS)

    Experiments on Spherical Tori (ST) show that plasma MHD activity may strongly deteriorate the confinement of energetic ions. Therefore, a study of the interplay of MHD modes and energetic ions is of large practical importance. Such a study is carried out in this work, where both the influence of the energetic ions on plasma MHD activity and the MHD-induced transport of energetic ions are considered. In particular, it is shown that in STs, in contrast to conventional tokamaks, the presence of trapped energetic ions may have a destabilizing influence on the ideal kink instability and the collisionless tearing instability. On the other hand, it is found the transport of energetic ions caused by reconnection events (sawtooth oscillations, internal reconnection events and non-ideal fishbones) has a number of peculiarities in STs. Specific calculations of the change of the neutron flux caused by the particle redistribution by reconnection events and of the loss fraction of the energetic ions are carried out for the Neutral Beam Injected (NBI) ions in the National Spherical Torus Experiment (NSTX). Results of the calculations are compared with experimental observations. (author)

  11. AGN Dusty Tori: II. Observational Implications of Clumpiness

    CERN Document Server

    Nenkova, Maia; Nikutta, Robert; Ivezic, Zeljko; Elitzur, Moshe

    2008-01-01

    From extensive radiative transfer calculations we find that clumpy torus models with \\No \\about 5--15 dusty clouds along radial equatorial rays successfully explain AGN infrared observations. The dust has standard Galactic composition, with individual cloud optical depth \\tV \\about 30--100 at visual. The models naturally explain the observed behavior of the 10\\mic silicate feature, in particular the lack of deep absorption features in AGN of any type. The weak 10\\mic emission feature tentatively detected in type 2 QSO can be reproduced if in these sources \\No drops to \\about 2 or \\tV exceeds \\about 100. The clouds angular distribution must have a soft-edge, e.g., Gaussian profile, the radial distribution should decrease as $1/r$ or $1/r^2$. Compact tori can explain all observations, in agreement with the recent interferometric evidence that the ratio of the torus outer to inner radius is perhaps as small as \\about 5--10. Clumpy torus models can produce nearly isotropic IR emission together with highly anisotr...

  12. M-theory FDA, twisted tori and Chevalley cohomology

    International Nuclear Information System (INIS)

    The FDA algebras emerging from twisted tori compactifications of M-theory with fluxes are discussed within the general classification scheme provided by Sullivan's theorems and by Chevalley cohomology. It is shown that the generalized Maurer-Cartan equations which have appeared in the literature, in spite of their complicated appearance, once suitably decoded within cohomology, lead to trivial FDAs, all new p-form generators being contractible when the 4-form flux is cohomologically trivial. Non-trivial D=4 FDAs can emerge from non-trivial fluxes but only if the cohomology class of the flux satisfies an additional algebraic condition which appears not to be satisfied in general and has to be studied for each algebra separately. As an illustration an exhaustive study of Chevalley cohomology for the simplest class of SS algebras is presented but a general formalism is developed, based on the structure of a double elliptic complex, which, besides providing the presented results, makes possible the quick analysis of compactification on any other twisted torus

  13. M-theory FDA, twisted tori and Chevalley cohomology

    Energy Technology Data Exchange (ETDEWEB)

    Fre, Pietro [Dipartimento di Fisica Teorica, Universita di Torino, INFN, Sezione di Torino, via P. Giuria 1, I-10125 Turin (Italy)]. E-mail: fre@to.infn.it

    2006-05-15

    The FDA algebras emerging from twisted tori compactifications of M-theory with fluxes are discussed within the general classification scheme provided by Sullivan's theorems and by Chevalley cohomology. It is shown that the generalized Maurer-Cartan equations which have appeared in the literature, in spite of their complicated appearance, once suitably decoded within cohomology, lead to trivial FDAs, all new p-form generators being contractible when the 4-form flux is cohomologically trivial. Non-trivial D=4 FDAs can emerge from non-trivial fluxes but only if the cohomology class of the flux satisfies an additional algebraic condition which appears not to be satisfied in general and has to be studied for each algebra separately. As an illustration an exhaustive study of Chevalley cohomology for the simplest class of SS algebras is presented but a general formalism is developed, based on the structure of a double elliptic complex, which, besides providing the presented results, makes possible the quick analysis of compactification on any other twisted torus.

  14. Oak Ridge National Laboratory ELMO Bumpy Torus radially resolved, time-dependent, one-dimensional transport code - user's guide

    International Nuclear Information System (INIS)

    The Oak Ridge National Laboratory Radially Resolved Time-Dependent One-Dimensional Transport code is described. The physical models and numerical techniques incorporated to follow the time evolution of ELMO Bumpy Torus plasmas ranging in size from the present experiment to power reactors are discussed. Sample input/output files are presented, and instructions for use on the Oak Ridge DEC-10 and the National Magnetic Fusion Energy Computer Center CRAY systems are given

  15. The prevalence of tori amongst constant mean curvature planes in R3

    Science.gov (United States)

    Carberry, Emma; Schmidt, Martin Ulrich

    2016-08-01

    Constant mean curvature (CMC) tori in Euclidean 3-space are described by an algebraic curve, called the spectral curve, together with a line bundle on this curve and a point on S1, called the Sym point. For a given spectral curve the possible choices of line bundle and Sym point are easily described. The space of spectral curves of tori is totally disconnected. Hence to characterise the "moduli space" of CMC tori one should, for each genus g, determine the closure Pg bar of spectral curves of CMC tori within the spectral curves of CMC planes having spectral genus g. We identify a real subvariety Rg and a subset Sg ⊆Rg such that Rmaxg ⊆Pg bar ⊆Sg, where Rmaxg denotes the points of Rg having maximal dimension. The lowest spectral genus for which tori exist is g = 2 and in this case R2 = Rmax2 =P2 bar =S2. For g > 2, we conjecture that Rg ⊋ Rmaxg =Sg. We give a number of alternative characterisations of Rmaxg and in particular introduce a new integer invariant of a CMC plane of finite type, called its winding number.

  16. Computation of whiskered invariant tori and their associated manifolds: new fast algorithms

    CERN Document Server

    Huguet, Gemma; Sire, Yannick

    2010-01-01

    In this paper we present efficient algorithms for the computation of several invariant objects for Hamiltonian dynamics. More precisely, we consider KAM tori (i.e diffeomorphic copies of the torus such that the motion on them is conjugated to a rigid rotation) both Lagrangian tori (of maximal dimension) and whiskered tori (i.e. tori with hyperbolic directions which, together with the tangents to the torus and the symplectic conjugates span the whole tangent space). In the case of whiskered tori, we also present algorithms to compute the invariant splitting and the invariant manifolds associated to the splitting. We present them both for the case of discrete time and for differential equations. The algorithms are based on a Newton method to solve an appropriately chosen functional equation that expresses invariance. The algorithms are efficient: if we discretize the objects by $N$ elements, one step of the Newton method requires only O(N) storage and $O(N \\ln(N))$ operations. Furthermore, if the object we cons...

  17. Spherical Tori. Report on the joint meeting of the IAEA technical committee meeting on spherical tori and the fourth international workshop on spherical tori held at the University of Tokyo, Tokyo, Japan 26-28 October 1998

    International Nuclear Information System (INIS)

    Spherical tori (ST), represented mainly by the spherical tokamak, are of growing importance for fusion research, and several new devices are planned or under construction around the world. The purpose of the Joint Meeting was to provide a forum for discussion of approaches to fusion energy based on ST. Other toroidal configurations, such as low aspect ratio helical systems and spheromaks, were also included in the scope of this meeting

  18. Efficient Indirect All-to-All Personalized Communication on Rings and 2-D Tori

    Institute of Scientific and Technical Information of China (English)

    GU Naijie

    2001-01-01

    All-to-All personalized communication is a basic communication operation in a parallel computing environment. There are a lot of results appearing in literature. All these communication algorithms can be divided into two kinds: direct communication algorithm and indirect communication algorithm. The optimal direct all-to-all communication algorithm on rings and 2-D tori does exist. But, for indirect all-to-all communication algorithms, there is a gap between the time complexity of the already existing algorithm and the lower bound. In this paper an efficient indirect algorithm for all-to-all communication on rings and 2-D square tori with bidirection channels is presented. The algorithms is faster than any previous indirect algorithms. The main items of the time complexity of the algorithm is p2/8 and pa/2/8 on rings and 2-D tori respectively, both reaching the theoretical lower bound, where p is the number of processors.

  19. Clumpy tori around type II active galactic nuclei as revealed by X-ray fluorescent lines

    Science.gov (United States)

    Liu, Jiren; Liu, Yuan; Li, Xiaobo; Xu, Weiwei; Gou, Lijun; Cheng, Cheng

    2016-06-01

    The reflection spectrum of a torus around an active galactic nucleus (AGN) is characterized by X-ray fluorescent lines, which are most prominent for type II AGNs. A clumpy torus allows photons reflected from the back-side of the torus to leak through the front regions that are free of obscuration. The observed X-ray fluorescent lines are therefore sensitive to the clumpiness of the torus. We analysed a sample of type II AGNs observed with the Chandra High Energy Transmission Grating Spectrometer (HETGS), and measured the fluxes for the Si Kα and Fe Kα lines. The measured Fe Kα/Si Kα ratios, spanning a range between 5 and 60, are far smaller than the ratios predicted from simulations of smooth tori, indicating that the tori of the studied sources have clumpy distributions rather than smooth ones. We compared the measured Fe Kα/Si Kα ratios with simulation results of clumpy tori. The Circinus galaxy has a Fe Kα/Si Kα ratio of ˜60, which is close to the simulation results for N = 5, where N is the average number of clumps along the line of sight. The Fe Kα/Si Kα ratios of the other sources are all below the simulation results for N = 2. Overall, this shows that the non-Fe fluorescent lines in the soft X-ray band are a potentially powerful probe of the clumpiness of tori around AGNs.

  20. Calibration of a diamagnetic diagnostic for stored energy of high-temperature electron annuli in Elmo Bumpy Torus (EBT)

    International Nuclear Information System (INIS)

    The perpendicular energy component of the stored energy of the electron annuli in ELMO Bumpy Torus (EBT) can be observed with diamagnetic flux detecting coils. The calibration of the signal from the coils in terms of stored energy requires a model for the geometrical structure of the annulus. Using a model of concentric cylindrical current sheets, the calibration factor for the diamagnetic perpendicular energy signal is derived, including the effects of drift currents and coupling of flux from adjacent annuli. Numerical calculations show the calibration factor to be insensitive to reasonable variations in the model parameters

  1. Conformal chiral boson models on twisted doubled tori and non-geometric string vacua

    CERN Document Server

    Avramis, Spyros D; Prezas, Nikolaos

    2009-01-01

    We derive and analyze the conditions for quantum conformal and Lorentz invariance of the duality symmetric interacting chiral boson sigma-models, which are conjectured to describe non-geometric string theory backgrounds. The one-loop Weyl and Lorentz anomalies are computed for the general case using the background field method. Subsequently, our results are applied to a class of (on-shell) Lorentz invariant chiral boson models which are based on twisted doubled tori. Our findings are in agreement with those expected from the effective supergravity approach, thereby firmly establishing that the chiral boson models under consideration provide the string worldsheet description of N=4 gauged supergravities with electric gaugings. Furthermore, they demonstrate that twisted doubled tori are indeed the doubled internal geometries underlying a large class of non-geometric string compactifications. For compact gaugings the associated chiral boson models are automatically conformal, a fact that is explained by showing ...

  2. On Invariant Tori of Nearly Integrable Hamiltonian Systems with Quasiperiodic Perturbation

    Directory of Open Access Journals (Sweden)

    Cheng Rong

    2010-01-01

    Full Text Available We are concerned with the persistence of frequency of invariant tori for analytic integrable Hamiltonian system with quasiperiodic perturbation. It is proved that if the unperturbed system satisfies the Rüssmann's nondegeneracy condition and has nonzero Brouwer's topological degree at some Diophantine frequency; the perturbed system satisfies the colinked nonresonant condition, then the invariant torus with this frequency persists under quasiperiodic perturbation.

  3. Equilibria of charged dust tori in a dipole magnetic field: hydrodynamic approach

    Czech Academy of Sciences Publication Activity Database

    Slaný, P.; Kovář, J.; Stuchlík, Z.; Karas, Vladimír

    Opava : Silesian University, 2014 - (Stuchlík, Z.), s. 221-227 ISBN 9788075101266. ISSN 2336-5668. - (Publications of the Institute of Physics. 7). [RAGtime /14.-16./. Opava (CZ), 18.09.2012-22.09.2012] R&D Projects: GA ČR GB14-37086G Institutional support: RVO:67985815 Keywords : dust tori * electric charge * magnetic field Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

  4. Charged perfect fluid tori in strong central gravitational and dipolar magnetic fields

    Science.gov (United States)

    Kovář, Jiří; Slaný, Petr; Cremaschini, Claudio; Stuchlík, Zdeněk; Karas, Vladimír; Trova, Audrey

    2016-06-01

    We study electrically charged perfect fluid toroidal structures encircling a spherically symmetric gravitating object with Schwarzschild spacetime geometry and endowed with a dipole magnetic field. The work represents a direct continuation of our previous general-relativistic studies of electrically charged fluid in the approximation of zero conductivity, which formed tori around a Reissner-Nordström black hole or a Schwarzschild black hole equipped with a test electric charge and immersed in an asymptotically uniform magnetic field. After a general introduction of the zero-conductivity charged fluid model, we discuss a variety of possible topologies of the toroidal fluid configurations. Along with the charged equatorial tori forming interesting coupled configurations, we demonstrate the existence of the off-equatorial tori, for which the dipole type of magnetic field seems to be necessary. We focus on orbiting structures with constant specific angular momentum and on those in permanent rigid rotation. We stress that the general analytical treatment developed in our previous works is enriched here by the integrated form of the pressure equations. To put our work into an astrophysical context, we identify the central object with an idealization of a nonrotating magnetic neutron star. Constraining ranges of its parameters and also parameters of the circling fluid, we discuss a possible relevance of the studied toroidal structures, presenting along with their topology also pressure, density, temperature and charge profiles.

  5. Preliminary scaling laws for plasma current, ion kinetic temperature, and plasma number density in the NASA Lewis bumpy torus plasma

    Science.gov (United States)

    Roth, J. R.

    1976-01-01

    Parametric variation of independent variables which may affect the characteristics of bumpy torus plasma have identified those which have a significant effect on the plasma current, ion kinetic temperature, and plasma number density, and those which do not. Empirical power law correlations of the plasma current, and the ion kinetic temperature and number density were obtained as functions of potential applied to the midplane electrode rings, the background neutral gas pressure, and the magnetic field strength. Additional parameters studied included the type of gas, the polarity of the midplane electrode rings, the mode of plasma operation, and the method of measuring the plasma number density. No significant departures from the scaling laws appear to occur at the highest ion kinetic temperatures or number densities obtained to date.

  6. Doubly twisted Neimark-Sacker bifurcation and two coexisting two-dimensional tori

    Science.gov (United States)

    Sekikawa, Munehisa; Inaba, Naohiko

    2016-01-01

    We discuss a complicated bifurcation structure involving several quasiperiodic bifurcations generated in a three-coupled delayed logistic map where a doubly twisted Neimark-Sacker bifurcation causes a transition from two coexisting periodic attractors to two coexisting invariant closed circles (ICCs) corresponding to two two-dimensional tori in a vector field. Such bifurcation structures are observed in Arnol'd tongues. Lyapunov and bifurcation analyses suggest that the two coexisting ICCs and the two coexisting periodic solutions almost overlap in the two-parameter bifurcation diagram.

  7. Lower dimensional invariant tori with prescribed frequency for nonlinear wave equation

    Science.gov (United States)

    Geng, Jiansheng; Ren, Xiufang

    In this paper, one-dimensional (1D) nonlinear wave equation u-u+mu+u=0, subject to Dirichlet boundary conditions is considered. We show that for each given m>0, and each prescribed integer b>1, the above equation admits a Whitney smooth family of small-amplitude quasi-periodic solutions with b-dimensional Diophantine frequencies, which correspond to b-dimensional invariant tori of an associated infinite-dimensional dynamical system. In particular, these Diophantine frequencies are the small dilation of a prescribed Diophantine vector. The proof is based on a partial Birkhoff normal form reduction and an improved KAM method.

  8. Tori Amos 《American Doll Posse》闪亮出炉

    Institute of Scientific and Technical Information of China (English)

    Karen

    2007-01-01

    最近,Tori Amos的新专辑《American Doll Posse》问世。虽然她去年发行了精选集,但这张专辑是2005年《the Beekeeper》以来的首张录音室作品。专辑发行的同时,Amos将踏上世界巡演的路程,5月28日的巡演第一站设在罗马。

  9. The outside of the Teichmuller space of punctured tori in Maskit's embedding

    OpenAIRE

    Parkkonen, Jouni

    1996-01-01

    We consider the following question: Which parameters in the extension of a rational pleating ray across the boundary of $\\Cal M$, the Maskit embedding of the Teichm\\"uller space of once punctured tori correspond to a Kleinian group? Using methods of Keen and Series and Wright we prove a local result, stating that on each rational ray there is a sequence of parameters in $\\overline\\Bbb H\\setminus\\Cal M$ accumulating at the boundary point of $\\Cal M$ on the ray. These are the unique parameters ...

  10. Twisted tori and fluxes: A no go theorem for Lie groups of weak G2 holonomy

    International Nuclear Information System (INIS)

    In this paper we prove the theorem that there exists no 7-dimensional Lie group manifold G of weak G2 holonomy. We actually prove a stronger statement, namely that there exists no 7-dimensional Lie group with positive definite Ricci tensor RicIJ. This result rules out (supersymmetric and non-supersymmetric) Freund-Rubin solutions of M-theory of the form AdS4xG and compactifications with non-trivial 4-form fluxes of Englert type on an internal group manifold G. A particular class of such backgrounds which, by our arguments are excluded as bulk supergravity compactifications corresponds to the so-called compactifications on twisted tori, for which G has structure constants τKIJ with vanishing trace τJIJ=0. On the other hand our result does not have bearing on warped compactifications of M-theory to four dimensions and/or to compactifications in the presence of localized sources (D-branes, orientifold planes and so forth). Henceforth our result singles out the latter compactifications as the preferred hunting grounds that need to be more systematically explored in relation with all compactification features involving twisted tori

  11. Evaluation of the effectiveness of light streamer tori-lines and characteristics of bait attacks by seabirds in the western North Pacific.

    Directory of Open Access Journals (Sweden)

    Noriyosi Sato

    Full Text Available To improve the effectiveness of tori-lines it is necessary to evaluate the ability of tori-lines to mitigate seabird bycatch and determine what kind of seabird species gather during line settings, attack the bait and are incidentally caught. We conducted two experiments in the western North Pacific and examined the effectiveness for seabird mitigation of light streamer tori-lines which have no long streamers but many light (short streamers and are mainly used in the North Pacific area. Firstly, the effectiveness of two different types of tori-line (light streamer (1 m and long streamer (up to 7 m tori-line and of two different colors (yellow and red of light streamers for seabird bycatch avoidance was evaluated using 567 sets based on data from 20 offshore surface commercial longliners. No significant difference in the bycatch number between the different tori-line types and streamer colors was found. Secondly, we investigated the characteristics of the seabird bycatch in the North Pacific and the effectiveness of three different types of streamers (light, hybrid and modified light types by detailed observations of seabird attacks using a chartered longline vessel. Although the appearance rate of albatrosses and shearwaters were 40.9% and 27.7%, Laysan albatross was the main seabird species that followed the vessel but shearwaters seldom followed the vessel and did not aggregate during line setting. In all attacks on bait observed during line settings, 81% and 7% were by albatrosses and shearwaters, respectively. In the number of primary attacks by Laysan albatrosses which attacked most aggressively of all seabirds, there were no significant differences among the tori-line types. No individuals of shearwater were caught. The results of both experiments indicated that light streamer tori-lines were as effective as tori-lines with long streamers for mitigating seabird bycatch in the North Pacific.

  12. Power balance in ELMO Bumpy Torus: bulk electrons and ions in a 37 kW discharge

    Energy Technology Data Exchange (ETDEWEB)

    McNeill, D.H.

    1985-10-01

    The power balance of the bulk electrons and ions in discharges with 37 kW of applied microwave power in the ELMO Bumpy Torus (EBT) is examined in a zero-dimensional model using data on the intensity and linewidth of the molecular and atomic hydrogen emission. At least 60% of the applied power is ultimately dissipated by processes involving the neutral particles, including dissociation of molecules, ionization of and radiation from atoms, and heating of cold electrons produced during atomic ionization. The molecular influx rate and the density of atoms are used independently to determine the bulk electron particle confinement time, and an upper bound estimate is made of the diffusional power loss from the bulk plasma electrons. Parameters derived from the basic spectroscopic data presented in this paper include the neutral atom density 2 - 5x10/sup 10/ cm/sup -3/, incident molecular flux 3 - 5x10/sup 15/ cm/sup -2/s/sup -1/, bulk ion temperature approx. =3 eV, and particle confinement time <1.1 ms. The bulk electron energy confinement time is 0.7 ms or less in the standard operating regime. Published data on the nonthermal electron and ion populations in the plasma are used to evaluate approximately the overall energy flow in the discharge. 54 refs.

  13. Power balance in ELMO Bumpy Torus: bulk electrons and ions in a 37 kW discharge

    International Nuclear Information System (INIS)

    The power balance of the bulk electrons and ions in discharges with 37 kW of applied microwave power in the ELMO Bumpy Torus (EBT) is examined in a zero-dimensional model using data on the intensity and linewidth of the molecular and atomic hydrogen emission. At least 60% of the applied power is ultimately dissipated by processes involving the neutral particles, including dissociation of molecules, ionization of and radiation from atoms, and heating of cold electrons produced during atomic ionization. The molecular influx rate and the density of atoms are used independently to determine the bulk electron particle confinement time, and an upper bound estimate is made of the diffusional power loss from the bulk plasma electrons. Parameters derived from the basic spectroscopic data presented in this paper include the neutral atom density 2 - 5x1010 cm-3, incident molecular flux 3 - 5x1015 cm-2s-1, bulk ion temperature approx. =3 eV, and particle confinement time <1.1 ms. The bulk electron energy confinement time is 0.7 ms or less in the standard operating regime. Published data on the nonthermal electron and ion populations in the plasma are used to evaluate approximately the overall energy flow in the discharge. 54 refs

  14. Simulations of flux variability of oscillating accretion fluid tori around Kerr black holes

    CERN Document Server

    Bakala, Pavel; Šrámková, Eva; Kotrlová, Andrea; Török, Gabriel; Vincent, Frederic H; Abramowicz, Marek A

    2014-01-01

    High frequency quasi-periodic oscillations (HF QPOs) are observed in the X-ray power-density spectra (PDS) of several microquasars and low mass X-ray binaries. Many proposed QPO models are based on oscillations of accretion toroidal fluid structures orbiting in the vicinity of a compact object. We study oscillating accretion tori orbiting in the vicinity of a Kerr black hole. We demonstrate that significant variation of the observed flux can be caused by the combination of radial and vertical oscillation modes of a slender, polytropic, perfect fluid, non-self-graviting torus with constant specific angular momentum. We investigate two combinations of the oscillating modes corresponding to the direct resonance QPO model and the modified relativistic precession QPO model.

  15. A numerical method for computing initial conditions of Lagrangian invariant tori using the frequency map

    Science.gov (United States)

    Luque, Alejandro; Villanueva, Jordi

    2016-06-01

    We present a numerical method for computing initial conditions of Lagrangian quasi-periodic invariant tori of Hamiltonian systems and symplectic maps. Such initial conditions are found by solving, using the Newton method, a nonlinear system obtained by imposing suitable conditions on the frequency map. The basic tool is a newly developed methodology to perform the frequency analysis of a discrete quasi-periodic signal, allowing to compute frequencies and their derivatives with respect to parameters. Roughly speaking, this method consists in computing suitable weighted averages of the iterates of the signal and using the Richardson extrapolation method. The proposed approach performs with high accuracy at a moderate computational cost. We illustrate the method by considering a discrete FPU model and the vicinity of the point L4 in a RTBP.

  16. Stationary Axisymmetric Configuration of the Resistive Thick Accretion Tori around a Schwarzschild Black Hole

    CERN Document Server

    Shaghaghian, M

    2016-01-01

    We examine a thick accretion disc in the presence of external gravity and intrinsic dipolar magnetic field due to a non-rotating central object. In this paper, we generalize the Newtonian theory of stationary axisymmetric resistive tori of Tripathy, Prasanna $\\&$ Das (1990) by including the fully general relativistic features. If we are to obtain the steady state configuration, we have to take into account the finite resistivity for the magnetofluid in order to avoid the piling up of the field lines anywhere in the accretion discs. The efficient value of conductivity must be much smaller than the classical conductivity to be astrophysically interesting. The accreting plasma in the presence of an external dipole magnetic field gives rise to a current in the azimuthal direction. The azimuthal current produced due to the motion of the magnetofluid modifies the magnetic field structure inside the disc and generates a poloidal magnetic field for the disc. The solutions we have found show that the radial inflow...

  17. Deformations on tilted tori and moduli stabilisation at the orbifold point

    Science.gov (United States)

    Blaszczyk, Michael; Honecker, Gabriele; Koltermann, Isabel

    2015-11-01

    We discuss deformations of orbifold singularities on tilted tori in the context of Type IIA orientifold model building with D6-branes on special Lagrangian cycles. Starting from {T}^6/({{Z}}_2× {{Z}}_2) , we mod out an additional {{Z}}_3 symmetry to describe phenomenologically appealing backgrounds and reduce to {{Z}}_3 and Ω R invariant orbits of deformations. While D6-branes carrying SO(2 N) or USp(2 N) gauge groups do not constrain deformations, D6-branes with U( N) gauge groups develop non-vanishing D-terms if they couple to previously singular, now deformed cycles. We present examples for both types of D6-branes, and in a three-generation Pati-Salam model on {T}^6/({{Z}}_2× {{Z}}_6^') we find that ten out of 15 twisted complex structure moduli are indeed stabilised at the orbifold point by the existence of the brane stacks.

  18. A KAM theorem without action-angle variables for elliptic lower dimensional tori

    International Nuclear Information System (INIS)

    We study elliptic lower dimensional invariant tori of Hamiltonian systems via parametrizations. The method is based on solving iteratively the functional equations that stand for invariance and reducibility. In contrast with classical methods, we do not assume that the system is close to an integrable one nor that it is written in action-angle variables. We only require an approximation of an invariant torus with a fixed vector of basic frequencies and a basis along the torus that approximately reduces the normal variational equations to constant coefficients. We want to highlight that this approach presents many advantages compared with methods which are built in terms of canonical transformations, e.g., it produces simpler and more constructive proofs that lead to more efficient numerical algorithms for the computation of these objects. Such numerical algorithms are suitable to be adapted in order to perform computer assisted proofs

  19. Neoclassical plasma viscosity and transport processes in non-axisymmetric tori

    Science.gov (United States)

    Shaing, K. C.; Ida, K.; Sabbagh, S. A.

    2015-11-01

    Neoclassical transport processes are important to the understanding of plasma confinement physics in doubly periodic magnetized toroidal plasmas, especially, after the impact of the momentum confinement on the particle and energy confinement is recognized. Real doubly periodic tori in general are non-axisymmetric, with symmetric tori as a special case. An eight-moment approach to transport theory with plasma density N, plasma pressure p, mass flow velocity V and heat flow q as independent variables is adopted. Transport processes are dictated by the solutions of the momentum and heat flux balance equations. For toroidal plasma confinement devices, the first order (in the gyro-radius ordering) plasma flows are on the magnetic surface to guarantee good plasma confinement and are thus two-dimensional. Two linearly independent components of the momentum equation are required to determine the flows completely. Once this two-dimensional flow is relaxed, i.e. the momentum equation reaches a steady state, plasmas become ambipolar, and all the transport fluxes are determined through the flux-force relation. The flux-force relation is derived both from the kinetic definitions for the transport fluxes and from the manipulation of the momentum and heat flux balance equations to illustrate the nature of the transport fluxes by examining their corresponding driven forces and their roles in the momentum and heat flux balance equations. Steady-state plasma flows are determined by the components of the stress and heat stress tensors in the momentum and heat flux balance equations. This approach emphasizes the pivotal role of the momentum equation in the transport processes and is particularly useful in modelling plasma flows in experiments. The methodology for neoclassical transport theory is applied to fluctuation-driven transport fluxes in the quasilinear theory to unify these two theories. Experimental observations in tokamaks and stellarators for the physics discussed are

  20. DEZVOLTAREA PARTENERIATELOR DE SOLIDARITATE ASAT ÎN SPRIJINUL MICILOR PRODUCĂTORI LOCALI: MIZE ŞI PREMIZE

    OpenAIRE

    Mihaela Veţan; Sergiu Florean

    2012-01-01

    Parteneriatele de solidaritate ASAT sunt dezvoltate în România începând cu anul 2008, în vederea susţinerii micilor producători agricoli care cultivă natural. Dezvoltarea acestora este susţinută la nivel naţional de Asociaţia Centrul de Resurse pentru Iniţiative Eticeși Solidare (CRIES). Mecanismul este unul bazat pe construirea unui relaţii de încredere între producători locali şi consumatori urbani. Astfel,se formează la nivel comunitar grupuri de consumatori care doresc să achiziţioneze pr...

  1. "Don't you realize it's Just Her Disguise?" : Performances of femininity by Kim Gordon, Tori Amos and Gillian Welch

    OpenAIRE

    2007-01-01

    Women who perform popular music are also performing gender. This is both because gender can be understood as performance and because musical conventions and styles carry with them assumptions about femininity and masculinity. This thesis concerns three female popular music artists; Kim Gordon of Sonic Youth, Tori Amos and Gillian Welch, and their performances of femininity. As these artists have been presented as or have presented themselves as in some way "authentic", my readings of these ar...

  2. Research support for plasma diagnostics on Elmo Bumpy Torus. Observations of EBT ring geometry by means of diamagnetic field measurements using a compensated ferromagnetic resonance magnetometer, and a preliminary numerical study of EBT flux penetration dynamics

    International Nuclear Information System (INIS)

    A preliminary numerical study of flux penetration dynamics has been made assuming a bumpy cylinder geometry for the EBT vacuum vessel. Estimates made by this study show that the diamagnetic signal from the rings should penetrate the vacuum vessel in a time on the order of 100 mS when the plasma is changed. This penetration time appears qualitatively reasonable

  3. Development of Instruments onboard ASTRO-H for Future X-ray Studies of Tori

    Science.gov (United States)

    Noda, H.

    2015-09-01

    The next astronomical X-ray satellite ASTRO-H will be launched by Japan Aerospace eXploration Agency (JAXA) in this Japanese fiscal year. It allows us to combine a simultaneous coverage of the 0.4-600 keV band, and a high energy-resolution spectroscopy in the 0.3-12 keV band with an FWHM energy resolution of coating hard X-ray mirrors, and a non-focusing soft gamma-ray detector covers the 40-600 keV band. The high energy-resolution spectroscopy is realized by the X-ray micro-calorimeter array operated at 50 mK on a focal plane of the soft X-ray telescope. With the unprecedented performances, the ASTRO-H observations of active galactic nuclei are expected to give us important X-ray information about tori including their dynamics, size, ionization state and so on. In the present talk, we introduce the current status of developments of the instruments onboard ASTRO-H, especially focusing on the performance of the X-ray micro-calorimeter derived in the ongoing ground testing and calibration.

  4. Lie tori of type B_2 and graded-simple Jordan structures covered by a triangle

    CERN Document Server

    Neher, Erhard

    2011-01-01

    We classify two classes of B_2-graded Lie algebras which have a second compatible grading by an abelian group A: (a) graded-simple Lie algebras for A torsion-free and (b) division-A-graded Lie algebras. Our results describe the centreless cores of a class of affine reflection Lie algebras, hence apply in particular to the centreless cores of extended affine Lie algebras, the so-called Lie tori, for which we recover results of Allison-Gao and Faulkner. Our classification (b) extends a recent result of Benkart-Yoshii. Both classifications are consequences of a new description of Jordan algebras covered by a triangle, which correspond to these Lie algebras via the Tits-Kantor-Koecher construction. The Jordan algebra classifications follow from our results on graded-triangulated Jordan triple systems. They generalize work of McCrimmon and the first author as well as the Osborn-McCrimmon-Capacity-2-Theorem in the ungraded case.

  5. Properties of dusty tori in active galactic nuclei - II. Type 2 AGN

    CERN Document Server

    Hatziminaoglou, Evanthia; Jarrett, Tom

    2009-01-01

    (abridged) This paper is the second part of a work investigating the properties of dusty tori in AGN by means of multi-component SED fitting. It focuses on low luminosity, low redshift (z < 0.25) AGN selected among emission line galaxies as well as X-ray, radio and mid-infrared selected type 2 AGN samples from the literature. The available multi-band photometry covers the spectral range from the u-band up to 160 um. The observed SED of each object is fit to a set of multi-component models comprising a stellar component, a high optical depth torus and cold emission from a starburst (SB). The contribution of the various components (stars, torus, SB) is reflected in the position of the objects on the IRAC colour diagram. The comparison of type 1 (as derived from Hatziminaoglou et al. 2008) and type 2 AGN properties is broadly consistent with the Unified Scheme. The estimated ratio between type 2 and type 1 objects is about 2-2.5:1. The AGN accretion-to-infrared luminosity ratio is an indicator of the obscurat...

  6. Kardiostimulátory a zdroje rušení

    OpenAIRE

    Lojková, Lea

    2009-01-01

    Tématem této semestrální práce jsou kardiostimulátory a zdroje rušení. Projekt částečně navazuje na starší diplomovou práci na dané téma (Ing. Kulík, Ústav automatizace a měřicí techniky FEKT, VUT Brno) a z hlediska metodiky měření rozvíjí dané téma podobným směrem. Teoretická část práce stručně vysvětluje principy nukleární magnetické rezonance a magnetické tomografie, popisuje nejběžnější metody používané při magnetické tomografii, definuje kardiostimulátor, uvádí hlavní milníky v jeho vývo...

  7. Current Profile and Magnetic Structure Measurements through Tangential Soft X-Ray Imaging in Compact Tori

    International Nuclear Information System (INIS)

    This report describes the fabrication and tests of a tangentially imaging soft X-ray (SXR) camera diagnostic for fusion energy plasma research. It can be used for the determination of the current distribution in strongly shaped toroidal magnetically confined plasmas, such as those found in spherical tori or advanced tokamaks. It included the development of both an appropriate imaging SXR camera and image analysis techniques necessary to deduce the plasma shape and current distribution. The basic camera concept consists of a tangentially viewing pinhole imaging system with thin-film SXR filters, a scintillator screen to provide SXR to visible conversion, a fast shuttering system, and an sensitive visible camera imaging device. The analysis approach consists of integrating the 2-D SXR image data into a Grad-Shafranov toroidal equilibrium solver code to provide strong constraints on the deduced plasma current and pressure profiles. Acceptable sensitivity in the deduced current profile can be obtained if the relative noise in the measured image can be kept in the range of 1% or less. Tests on the Pegasus Toroidal Experiment indicate very flat safety factor profiles in the plasma interior

  8. Deformations on Tilted Tori and Moduli Stabilisation at the Orbifold Point

    CERN Document Server

    Blaszczyk, Michael; Koltermann, Isabel

    2015-01-01

    We discuss deformations of orbifold singularities on tilted tori in the context of Type IIA orientifold model building with D6-branes on special Lagrangian cycles. Starting from $T^6/(\\mathbb{Z}_2 \\times \\mathbb{Z}_2)$, we mod out an additional $\\mathbb{Z}_3$ symmetry to describe phenomenologically appealing backgrounds and reduce to $\\mathbb{Z}_3$ and $\\Omega\\mathcal{R}$ invariant orbits of deformations. While D6-branes carrying SO(2N) or USp(2N) gauge groups do not constrain deformations, D6-branes with U(N) gauge groups develop non-vanishing D-terms if they couple to previously singular, now deformed cycles. We present examples for both types of D6-branes, and in a three-generation Pati-Salam model on $T^6/(\\mathbb{Z}_2 \\times \\mathbb{Z}_6')$ we find that ten out of 15 twisted complex structure moduli are indeed stabilised at the orbifold point by the existence of the brane stacks.

  9. Mesh theory of angle modified dual tori double-enveloping toroidal worm drive

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    In this paper, the meshing theory of the angle modified hourglass worm drive is enriched and developed. The ordinary condition of the angle modification is derived and the physical significance of the modification is interpreted. A normal section methodology is proposed for meshing analysis, which can be used to compute the normal distance near a singular meshing point of a conjugate surface couple. By means of the method and after analyzing the normal transversals, it is specified that the worm helicoid, the nominal former contact zone and the new contact zone intersect each other along the locus of singular points of the instantaneous contact lines of an angle-modified worm pair. As a result, it is explained clearly that those three osculate each other but the osculations are different in degree. Moreover, the mechanism of removing the twice-contacted zone from the worm gear tooth surface is clarified and the reason of shortening the worm working length is also elucidated. With the help of the theory described in the present paper and the thorough and systematic research on the relevant meshing characteristics, the angle modified dual tori double-enveloping toroidal worm drive has been shown to be an excellent new-fashioned hourglass worm set.

  10. Radiation-driven Outflows from and Radiative Support in Dusty Tori of Active Galactic Nuclei

    Science.gov (United States)

    Chan, Chi-Ho; Krolik, Julian H.

    2016-07-01

    Substantial evidence points to dusty, geometrically thick tori obscuring the central engines of active galactic nuclei (AGNs), but so far no mechanism satisfactorily explains why cool dust in the torus remains in a puffy geometry. Near-Eddington infrared (IR) and ultraviolet (UV) luminosities coupled with high dust opacities at these frequencies suggest that radiation pressure on dust can play a significant role in shaping the torus. To explore the possible effects of radiation pressure, we perform three-dimensional radiative hydrodynamics simulations of an initially smooth torus. Our code solves the hydrodynamics equations, the time-dependent multi–angle group IR radiative transfer (RT) equation, and the time-independent UV RT equation. We find a highly dynamic situation. IR radiation is anisotropic, leaving primarily through the central hole. The torus inner surface exhibits a break in axisymmetry under the influence of radiation and differential rotation; clumping follows. In addition, UV radiation pressure on dust launches a strong wind along the inner surface; when scaled to realistic AGN parameters, this outflow travels at ˜ 5000 {(M/{10}7{M}ȯ )}1/4 {[{L}{UV}/(0.1{L}{{E}})]}1/4 {km} {{{s}}}-1 and carries ˜ 0.1 {(M/{10}7{M}ȯ )}3/4 {[{L}{UV}/(0.1{L}{{E}})]}3/4 M ⊙ yr‑1, where M, {L}{UV}, and {L}{{E}} are the mass, UV luminosity, and Eddington luminosity of the central object respectively.

  11. Toris K Silicone Hydrogel Contact Lens for the Optical Management of Keratoconus

    OpenAIRE

    1, Leyla YAVUZ; 2, İhsan YILMAZ; 1, Özlen Rodop ÖZGÜR; 1, Baran KANDEMİR; 1, Ümit CALLI; 1, Cemalettin CABI

    2013-01-01

    Amaç: Keratokonus hastalarının görsel rehabilitasyonunda Toris K silikon hidrojel lensinin etkinliğini değerlendirmek. Materyal ve Metot: Retrospektif çalışmaya 58 hastanın 100 gözü dahil edildi. Hastaların ortalama yaşı 27,04± 9,5 yaş idi ve 15 göz grade 1, 28 göz grade 2, 13 göz grade 3, 44 göz grade 4 keratokonus idi. Düzeltilmemiş en iyi görme keskinliği, gözlükle düzeltilmiş en iyi görme keskinliği, korneal topografik ölçümler ve pakimetrik değerler kayıt edildi. Ortalama korneal kırıcı...

  12. Toroidal orbifolds of Z3 and Z6 symmetries of noncommutative tori

    Science.gov (United States)

    Walters, Sam

    2015-05-01

    The Hexic transform ρ of the noncommutative 2-torus Aθ is the canonical order 6 automorphism defined by ρ (U) = V, ρ (V) =e-πiθU-1 V, where U, V are the canonical unitary generators obeying the unitary Heisenberg commutation relation VU =e2πiθ UV . The Cubic transform is κ =ρ2. These are canonical analogues of the noncommutative Fourier transform, and their associated fixed point C*-algebras Aθρ, Aθκ are noncommutative Z6, Z3 toroidal orbifolds, respectively. For a large class of irrationals θ and rational approximations p / q of θ, a projection e of trace q2 θ - pq is constructed in Aθ that is invariant under the Hexic transform. Further, this projection is shown to be a matrix projection in the sense that it is approximately central, the cut down algebra eAθ e contains a Hexic invariant q × q matrix algebra M whose unit is e and such that the cut downs eUe, eVe are approximately inside M. It is also shown that these invariant matrix projections are covariant in that they arise from a continuous section E (t) of C∞-projections of the continuous field {At } 0 algebras such that ρ (E (t)) = E (t). It turns out that the projection E (t) is the support projection of a canonical C∞-positive element that has the appearance of a noncommutative 2-dimensional Theta function. The topological invariants (or 'quantum' numbers) of E (t), e, and related projections are computed by a new and quicker method than in previous works. (They would also give topological invariants for finitely generated projective modules over noncommutative orbifolds associated to Z6 and Z3 symmetries of noncommutative tori.) We remark that these results have some bearing on research work related to noncommutative orbifolds used in string theory.

  13. Stationary axisymmetric configuration of the resistive thick accretion tori around a Schwarzschild black hole

    Science.gov (United States)

    Shaghaghian, M.

    2016-02-01

    We examine a thick accretion disc in the presence of external gravity and intrinsic dipolar magnetic field due to a non-rotating central object. In this paper, we generalize the Newtonian theory of stationary axisymmetric resistive tori of Tripathy, Prasanna & Das by including the fully general relativistic features. If we are to obtain the steady state configuration, we have to take into account the finite resistivity for the magnetofluid in order to avoid the piling up of the field lines anywhere in the accretion discs. The efficient value of conductivity must be much smaller than the classical conductivity to be astrophysically interesting. The accreting plasma in the presence of an external dipole magnetic field gives rise to a current in the azimuthal direction. The azimuthal current produced due to the motion of the magnetofluid modifies the magnetic field structure inside the disc and generates a poloidal magnetic field for the disc. The solutions we have found show that the radial inflow, pressure and density distributions are strongly modified by the electrical conductivity both in relativistic and Newtonian regimes. However, the range of conductivity coefficient is different for both regimes, as well as that of the angular momentum parameter and the radius of the innermost stable circular orbit. Furthermore, it is shown that the azimuthal velocity of the disc which is not dependent on conductivity is sub-Keplerian in all radial distances for both regimes. Owing to the presence of pressure gradient and magnetic forces. This work may also be important for the general relativistic computational magnetohydrodynamics that suffers from the lack of exact analytic solutions that are needed to test computer codes.

  14. Reflection symmetry effects in the perturbation series of an action integral for the field line displacement in an ELMO Bumpy Torus

    International Nuclear Information System (INIS)

    Deviations from this ideal geometry and less-than-perfect alignment of the field coils in an ELMO Bumpy Torus generate perturbations to the ideal magnetic field configuration, resulting generally in failure of the field lines to close on themselves and thereby causing degradation in plasma confinement. The sensitivity of the field line displacement to certain types of errors in coil parameters is studied by means of a perturbation formalism developed for an action integral representing the longitudinal adiabatic invariant. Reflection symmetry properties satisfied by the magnetic field and the vector potential are derived, and it is demonstrated both analytically and numerically that the leading term of the field line displacement per period of 2π around the major axis is second order in the perturbation parameter if the coil planes remain invariant under the perturbation. Numerical analyses for the field line displacement also reveal some more useful properties for the first- and second-order terms in the perturbation series

  15. Clinical Performance of Toris K Contact Lens in Patients with Moderate to Advanced Keratoconus: A Real Life Retrospective Analysis

    Science.gov (United States)

    Yilmaz, Ihsan; Ozcelik, Ferah; Basarir, Berna; Demir, Gokhan; Durusoy, Gonul; Taskapili, Muhittin

    2016-01-01

    Objectives. To evaluate the visual performance of Toris K soft contact lenses in patients with moderate-to-advanced keratoconus and also to compare the results according to cone types, cone location, and severity of keratoconus. Materials and Methods. Sixty eyes of 40 participants were included in this retrospective study. Uncorrected visual acuity (UCVA), best-spectacle corrected visual acuity (BCVA), best-contact lens corrected visual acuity (BCLCVA), and comfort rating via visual analogue scales (VAS) were measured. Results. The mean age was 27.3 ± 8.6 years (range: 18 to 54). The mean logMAR UCVA, BCVA, and BCLCVA were 0.85 ± 0.38 (range: 0.30–1.30), 0.47 ± 0.27 (range: 0.10–1.30), and 0.16 ± 0.20 (range: 0–1.00). There were significant increases in visual acuities with contact lenses (p < .05). BCLCVA was significantly better in oval type than globus type (p = .022). UCVA and BCLCVA were significantly better in moderate keratoconus group (p = .015, p = .018). The mean line gain in Snellen was 3.6 ± 1.8 lines (range: 0–7 lines). The mean line gain was higher in central cone group than paracentral cone group and oval group than globus group (p = .014, p = .045). The mean VAS score was 8.14 ± 1.88 (range: 6–10). Conclusions. Toris K can improve visual acuity of patients with keratoconus. Toris K is successful even in the moderate and advanced form of the disease. PMID:27144012

  16. Flux-force relation for non-axisymmetric tori in general flux coordinates and neoclassical toroidal plasma viscosity

    International Nuclear Information System (INIS)

    Flux-force relation, a fundamental relation that relates transport fluxes to forces, for non-axisymmetric tori in general magnetic flux coordinates that are not Hamada coordinates, is derived. The derivation is based on kinetic theory instead of fluid theory. It is shown that pressure force also contributes to the relation in non-Hamada coordinates in general to make the relation compatible with kinetic theory and to make it coordinates invariant. The results are applied to the theory for the neoclassical toroidal viscosity in tokamaks that have error fields or resistive magnetohydrodynamic (MHD) modes.

  17. Electrically charged matter in permanent rotation around magnetized black hole: A toy model for self-gravitating fluid tori

    CERN Document Server

    Trova, A; Slany, P; Kovar, J

    2016-01-01

    We present an analytical approach for the equilibrium of a self-gravitating charged fluid embedded in a spherical gravitational and dipolar magnetic fields produced by a central mass. Our scheme is proposed, as a toy-model, in the context of gaseous/dusty tori surrounding supermassive black holes in galactic nuclei. While the central black hole dominates the gravitational field and it remains electrically neutral, the surrounding material has a non-negligible self-gravitational effect on the torus structure. By charging mechanisms it also acquires non-zero electric charge density, so the two influences need to be taken into account to achieve a self-consistent picture. With our approach we discuss the impact of self-gravity, represented by the term dt (ratio of the torus total mass to the mass of the central body), on the conditions for existence of the equilibrium and the morphology and typology of the tori. By comparison with a previous work without self-gravity, we show that the conditions can be different...

  18. DEZVOLTAREA PARTENERIATELOR DE SOLIDARITATE ASAT ÎN SPRIJINUL MICILOR PRODUCĂTORI LOCALI: MIZE ŞI PREMIZE

    Directory of Open Access Journals (Sweden)

    Mihaela Veţan

    2012-10-01

    Full Text Available Parteneriatele de solidaritate ASAT sunt dezvoltate în România începând cu anul 2008, în vederea susţinerii micilor producători agricoli care cultivă natural. Dezvoltarea acestora este susţinută la nivel naţional de Asociaţia Centrul de Resurse pentru Iniţiative Eticeși Solidare (CRIES. Mecanismul este unul bazat pe construirea unui relaţii de încredere între producători locali şi consumatori urbani. Astfel,se formează la nivel comunitar grupuri de consumatori care doresc să achiziţioneze produse realizate de mici agricultori, cu care încheie un contract pe perioada unui sezon agricol și cărora le plătesc un avans, în vederea susţinerii costurilor de producţie.

  19. Är variation i STFI-tjocklek ett bra mått på kartongs bulighet? : Are variation in STFI-thickness a good measure of uneven surface, bumpiness, on cardboard?

    OpenAIRE

    Mattsson, Anna

    2009-01-01

    This degree project aim to evaluate if variations of the STFI thickness can be used to assess bumpiness on cardboard. During the project cardboard samples were measured using Bendtsen, PPS, a L&W formation tester, OptiTopo, Ambertec formation, the STFI thickness tester and a visual comparison. The different methods were then compared to see if there is any correlations between them. The results showed that the visual comparison and OptiTopo correlates. The STFI thickness tester shows however ...

  20. Semiclassical quantization via adiabatic switching. I. Choice of tori and initial conditions for two-dimensional systems

    Energy Technology Data Exchange (ETDEWEB)

    Zakrzewski, J.; Saini, S.; Taylor, H.S.

    1988-10-15

    A general theoretical base and a general strategy for implementing semiclassical quantization using the adiabatic-switching method are presented for two-dimensional systems. The method proposed does not depend on specialized coordinates, trajectory, or surfaces-of-section studies and is generalizable to multidimensional systems. The choice of the initial tori for the switching procedure is accomplished by simple diagonalizations of small-dimensional matrix representations of invariant operators obtained from perturbation theory. The method gives quantum energies at a useful level of accuracy for the vast majority of states in many of the well-known nonresonant and resonant Hamiltonian cases. Many eigenvalues previously thought unobtainable when the adiabatic-switching method is used are obtained in a quite simple manner.

  1. Research support for plasma diagnostics on Elmo Bumpy Torus: study of diamagnetic measurements for the electron rings and development of a ferromagnetic resonance magnetometer

    International Nuclear Information System (INIS)

    The bumpy cylinder MHD equilibrium code which was compared to the concentric current sheet model for the EBT electron rings in a previous report has been subjected to additional numerical tests which confirm the validity of the previous work. Further analysis of the current sheet model as a means of calibration of the EBT diamagnetic diagnostic for perpendicular energy shows the model's simplicity is not the limiting factor in accuracy of the calibration. The fluctuations of the currents in the vacuum field coils were observed as voltage signals from the generator shunts. Significant low frequency components were observed that cannot be removed from diamagnetic signals by low pass filtering alone. A YIG magnetometer was developed and used to make test measurements of the diamagnetic field of the electron rings on EBT. The field values observed were on the order of 1 Gauss in a region where the vacuum field was about 600 Gauss. These values agree with the perpendicular energy diamagnetic flux diagnostic with reasonable assumptions for ring geometry

  2. Research support for plasma diagnostics on Elmo Bumpy Torus - development of a multichannel Hall-probe based diamagnetic diagnostic instrument and observation and modeling of EBT electron rings. Final report, October 1, 1982-September 30, 1983

    International Nuclear Information System (INIS)

    Use of multiple Hall effect probes is a cost effective way to observe diamagnetic fields from the hot electron rings in the Elmo Bumpy Torus device at several locations simultaneously. A special diagnostic instrument has been developed having six Hall probe channels with the sensitivity and stability needed for the diamagnetic measurements. The instrument uses an AC carrier system with isolation transformers located remotely from the instrument and near the probe locations. Details of instrument design as well as operating instructions for it are included in this report

  3. X-ray bumps, iron K-alpha lines, and X-ray suppression by obscuring tori in Seyfert galaxies

    Science.gov (United States)

    Krolik, Julian H.; Madau, Piero; Zycki, Piotr T.

    1994-01-01

    We investigate the X-ray spectral properties of unobscured type 1 and obscured type 2 Seyferts as predicted by the unified Seyfert scheme. We consider the reprocessing of X-ray photons by photoelectric absorption, iron fluorescence, and Compton downscattering in the obscuring tori surrounding these active nuclei, and compute by Monte Carlo methods the reprocessed spectra as a function of the viewing angle. Depending on the optical depth and shape of the torus, and on the viewing angle, the X-ray flux can be suppressed by substantial factors when our line of sight is obscured. We show that an immediate consequence of the existence of an obscuring thick torus is the production in the spectra of type 1 Seyfert galaxies of a bump in the continuum above 10-20 keV and an Fe K-alpha line with significant equivalent width. In those type 2 Seyferts for which the hard X-ray spectrum has been substantially suppressed, the equivalent width of the Fe K-alpha line in the transmitted spectrum can be very large.

  4. Poloidal potential in the low-collisionality regime in a nonaxisymmetric torus

    International Nuclear Information System (INIS)

    The poloidal potential is calculated numerically in the low-collisionality regime for nonaxisymmetric tori such as stellarators and bumpy tori. It is found that even fairly deep into the superbanana regime, the poloidal potential retains the simple azimuthal dependence of the plateau regime. 12 refs., 8 figs

  5. 橡木贴面实木复合地板凹凸表面热压工艺研究%Study on Hot-pressing Process for the Bumpy Surface of Engineered Flooring Overlaid with Oak Veneer

    Institute of Scientific and Technical Information of China (English)

    方萍; 李黎

    2015-01-01

    三聚氰胺浸渍橡木薄单板贴面实木复合地板是参考三聚氰胺浸渍纸贴面生产工艺生产出的表面凹凸实木复合地板。使用三聚氰胺胶黏剂、固化剂、渗透剂、脱膜剂(配比为500:1:1:1)混合液浸渍橡木薄单板,然后在真空度为0.08 MPa时保压浸渍5 min,在大气条件下放置30 min,取出后再放入90℃鼓风干燥箱中干燥10 min。浸渍完成的橡木薄单板与基材经热压成型为表面凹凸的实木复合地板。考虑热压温度、热压压力、热压时间对其凹凸表面成型的影响,每个因素取4个水平,制定因素水平表,选择正交表进行试验。对试验结果进行浸渍剥离及表面纹理深度的测量分析,得到最优的热压工艺条件为温度150℃、压力1.2 MPa、时间70 s。三聚氰胺浸渍的橡木贴面复合地板表面纹理、色泽、手感都更加接近自然。%Reference the producing technology of laminate floor,the hot-pressing of engineered floor which has bumpy sur-face overlaying with melamine formaldehyde resin(MF)impregnated oak veneer was studied. The oak veneer is dipped in the mixed liquor which has melamine formaldehyde resin,curing agent,penetrating agent,release agent(ratio of 500:1:1:1). After dipping 5 min when the vacuum degree is 0.08 MPa,it keeps 30 min in room conditions. Then dry 10 min in drying oven with temperature is 90 ℃.The impregnated oak veneer and ply wood as based of engineered flooring are put into the hot press under the different temperature,pressure and time to process shaping of its bumpy surface. The four levels of each fac-tor of hot- press is selected to investigate the effect on shaping of its bumpy surface in the experiment. Measured its dipping detachment and surface bumpy depth,the results shown that the optimum hot-pressing process conditions is temperature 150 ℃, the pressure 1.2 MPa,and time 70 s.

  6. Leidenfrost levitated liquid tori

    Science.gov (United States)

    Perrard, Stéphane; Labousse, Matthieu; Fort, Emmanuel; Bush, John; Couder, Yves; Limat, Laurent

    2012-11-01

    A drop of water deposited on a surface hotter than 150°C can levitate without any contact with a solid container. Indeed the evaporation of the fluid generates a thin vapour film, which supports the drop's weight by lubrication forces (Leidenfrost effect). This effect was until now limited to droplets. We propose here an original substrate geometry, a circular brass through, that allows us to maintain in levitation any quantity of fluid. It could be a good tool to study wave propagation without solid boundary condition and thus very low friction. We report here one possible application, and our most striking observation : when the substrate temperature is high enough, convective motion appears in the liquid torus and its inner side becomes polygonal. This periodic deformation of large amplitude propagates along the azimuthal direction. The geometry, the flow and the shape appear very similar to the polygonal destabilization of an hydraulic jump. We propose here an experimental and theorical characterization of these rotating polygons having from three to twelve sides. Moreover, we have found a model describing the shape for any number of sides. It appears closely related to the Korteweg de Vries equation describing the propagation of solitonic waves in shallow water.

  7. Configuration spaces of tori

    OpenAIRE

    Feler, Yoel

    2006-01-01

    The configuration space C^n of unordered n-tuples of distinct points on a torus T^2 is a non-singular complex algebraic variety. We study holomorphic self-maps of C^n and prove that for n>4 any such map F either carries the whole of C^n into an orbit of the diagonal Aut(T^2) action in C^n or is of the form F(x)=T(x)x for some holomorphic map T:C^n-->Aut(T^2). We also prove that for n>4 any endomorphism of the torus braid group B_n(T^2) with a non-abelian image preserves the pure torus braid g...

  8. Star Formation Black Hole Growth and Dusty Tori in the Most Luminous AGNs at z=2-3.5

    Science.gov (United States)

    Netzer, Hagai; Lani, Caterina; Nordon, Raanan; Trakhtenbrot, Benny; Lira, Paulina; Shemmer, Ohad

    2016-03-01

    We report Herschel/SPIRE observations of 100 very luminous, optically selected active galactic nuclei (AGNs) at z=2{--}3.5 with {log} {L}{{1350}} (erg s-1) ≥ 46.5 , where {L}{{1350}} is λLλ at 1350 Å. The distribution in {L}{{1350}} is similar to the general distribution of Sloan Digital Sky Survey AGNs in this redshift and luminosity interval. We measured star-formation (SF) luminosity, {L}{{SF}}, and SF rate (SFR) in 34 detected sources by fitting combined SF and torus templates, where the torus emission is based on Wide Field Infrared Survey Explorer observations. We also obtained statistically significant stacks for the undetected sources in two luminosity groups. The sample properties are compared with those of very luminous AGNs at z\\gt 4.5. The main findings are: (1) The mean and the median SFRs of the detected sources are {1176}-339+476 and {1010}-503+706 M⊙ yr-1, respectively. The mean SFR of the undetected sources is 148 M⊙ yr-1. The ratio of SFR to the black hole accretion rate is ≈80 for the detected sources and less than 10 for the undetected sources. Unlike a sample of sources at z ≃ 4.8 that we studied recently, there is no difference in {L}{{AGN}} and only a very small difference in {L}{{torus}} between the detected and undetected sources. (2) The redshift distribution of {L}{{SF}} and {L}{{AGN}} for the most luminous, redshift 2-7 AGNs are different. Similar to previous studies, the highest {L}{{AGN}} are found at z ≈ 3. However, the {L}{{SF}} of such sources peaks at z ≈ 5. Assuming the objects in our sample are hosted by the most massive galaxies at those redshifts, we find that approximately 2/3 of the hosts are already below the main sequence of SF galaxies at z = 2-3.5. (3) The spectral energy distributions (SEDs) of dusty tori at high redshift are similar to the shapes found in low redshift, low luminosity AGNs. Herschel upper limits put strong constraints on the long wavelength shape of the SED, ruling out several earlier

  9. Towards a fully stringy computation of Yukawa couplings on non factorized tori and non abelian twist correlators (I): the classical solution and action

    CERN Document Server

    Pesando, Igor

    2015-01-01

    We consider the simplest possible setting of non abelian twist fields which corresponds to $SU(2)$ monodromies. We first review the theory of hypergeometric function and of the solutions of the most general Fuchsian second order equation with three singularities. Then we solve the problem of writing the general solution with prescribed $U(2)$ monodromies. We use this result to compute the classical string solution corresponding to three $D2$ branes in $R^4$. Despite the fact the configuration is supersymmetric the classical string solution is not holomorphic. Using the equation of motion and not the KLT approach we give a very simple expression for the classical action of the string. We find that the classical action is not proportional to the area of the triangle determined by the branes intersection points since the solution is not holomorphic. Phenomenologically this means that the Yukawa couplings for these supersymmetric configurations on non factorized tori are suppressed with respect to the factorized ...

  10. Rahvapärane viiulimäng 20.sajandi esimesel poolel Tori ja Vändra viiuldajate näitel

    Directory of Open Access Journals (Sweden)

    Krista Sildoja

    2011-12-01

    Full Text Available The article gives an overview of the most well-known village fiddlers in Tori and Vändra parish, their repertoire, playing style and status as dance music players in the first half of the 20th century. This is one of the first efforts to try and describe Estonian traditional instrumental music from the inside so to say. First, the author learned to play the Estonian type of waltzes and polkas gathered from the local village musicians in her neighbourhood and used traditional method of learning by ear. Contact with the old fiddlers has been created artificially using the help of archive recordings datingback to the years 1936 and 1937. Following the personal experience of playing old fiddle tunes the author started transcribing and examining the tunes systematically.At that time both solo and duo performances were recorded from Tori and Vändra fiddlers. Those recordings compile the research material for the present article and on the basis of the recordings it is possible to describe how the fiddlers played back then. Transcriptions give an insight to the approach to form of the music and playing technique used in the fiddle tunes. Briefly, the body of those characteristics can be called the manner of playing the description of which introduces the musical thinking of village fiddlers and the overall characteristics of the performed music.What can be said to describe the traditional manner of playing based on the example of Tori and Vändra parish fiddlers? The districts of Tori and Vändra in the first half of the 20th century can be characterised by playing in fiddle duos. Compared to what was going on in Estonia of that time generally, it is not unique, because there were alsofiddle duos elsewhere. What is special about Tori and Vändra duos is how they wereplayed in. When playing in duos fiddlers used two different ways of playing. The first ofthem, one of the most characterising ones, is imitating bagpipe with fiddle, which wasonly used by

  11. 钢丝缠绕重型模锻液压机坎合结构的疲劳和寿命预测%Fatigue Life Prediction of the Bumpy Ridge Joining of the Heavy Die Forging Press with Steel Wire Wound

    Institute of Scientific and Technical Information of China (English)

    何文斌; 曾攀; 林峰; 颜永年; 张磊

    2015-01-01

    The bumpy ridge joining is the key technology of the heavy die forging press with steel wire wound. The shear resistance and the fatigue resistance of the bumpy ridge palr are vital to the integrity of the frame during service. The use of the technology is limited due to the deficient research on the principle of the bumpy ridge joining and the fatigue resistance of the structure. A set of clamp was developed to test the structural fatigue of the bumpy ridge joining, by which groups of fatigue tests of constant amplitude cycle tangential loading were performed.The cycle characteristic of the load-displacement of the bumpy ridge joining under the cycling tangential load is studied and the exponential model of the structural fatigue is established, the dimensionless fatigue load limit tmax*F is 0.74 when the load ratio R is 0.1. The relation between dimensionless amplitude value and mean value of the tangential load ( a mF*-F*) is studied to get the fatigue constant life curve, as well as a criterion of bumpy ridge structural damage accumulation is established based on Miner's theory. The safety evaluation and fatigue life prediction are implemented for the bumpy ridge structures of the heavy die forging press with steel wire wound.%剖分坎合是钢丝缠绕液压机的关键技术,坎合副的抗剪性及其抗疲劳性对模锻液压机使役期间保持机架完整性至关重要。坎合原理及抗疲劳性方面研究工作的不足限制了该技术的推广和应用。设计坎合疲劳试验夹具,对液压机本体小试样坎合结构进行切向等幅循环载荷疲劳试验。分析坎合结构切向循环载荷条件下三个阶段的载荷-位移循环特性;建立坎合结构疲劳指数模型,当载荷比R=0.1时,坎合结构疲劳量纲一载荷极限为Ft*max=0.74;研究量纲一切向载荷幅值与均值 a mF*-F*关系,得到坎合结构疲劳等寿命曲线;提出基于Miner线性累积损伤理论的坎合结构疲劳累积

  12. Towards a fully stringy computation of Yukawa couplings on non-factorized tori and non-abelian twist correlators (I): The classical solution and action

    Science.gov (United States)

    Pesando, Igor

    2016-09-01

    We consider the simplest possible setting of non-abelian twist fields which corresponds to SU (2) monodromies. We first review the theory of hypergeometric function and of the solutions of the most general Fuchsian second order equation with three singularities. Then we solve the problem of writing the general solution with prescribed U (2) monodromies. We use this result to compute the classical string solution corresponding to three D2 branes in R4. Despite the fact that the configuration is supersymmetric the classical string solution is not holomorphic. Using the equation of motion and not the KLT approach we give a very simple expression for the classical action of the string. We find that the classical action is not proportional to the area of the triangle determined by the branes intersection points since the solution is not holomorphic. Phenomenologically this means that the Yukawa couplings for these supersymmetric configurations on non-factorized tori are suppressed with respect to the factorized case.

  13. Design To Manufacturing Process:Bumpy Road?

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    Ntegration between design and manufacturing is one of the topics that normally hits a lot of discussion in the product development and PLM space.To support this process becomes more and more important in a modern enterprise manufacturing organization.You can ask me why? Let me put is simple this is one of the most important processes that can drive cost optimization in the companies.Everything a company is making need to be first designed and later manufacturing.If it breaks nothing can help.

  14. Test Structures For Bumpy Integrated Circuits

    Science.gov (United States)

    Buehler, Martin G.; Sayah, Hoshyar R.

    1989-01-01

    Cross-bridge resistors added to comb and serpentine patterns. Improved combination of test structures built into integrated circuit used to evaluate design rules, fabrication processes, and quality of interconnections. Consist of meshing serpentines and combs, and cross bridge. Structures used to make electrical measurements revealing defects in design or fabrication. Combination of test structures includes three comb arrays, two serpentine arrays, and cross bridge. Made of aluminum or polycrystalline silicon, depending on material in integrated-circuit layers evaluated. Aluminum combs and serpentine arrays deposited over steps made by polycrystalline silicon and diffusion layers, while polycrystalline silicon versions of these structures used to cross over steps made by thick oxide layer.

  15. The bumpy road from renewable to sustainable

    International Nuclear Information System (INIS)

    Solar energy is inherently renewable, but not automatically (fully) sustainable. Few people will disagree with this general statement, but that is about where consensus ends. Photovoltaic solar energy (PV) has rapidly left behind the megawatt-era and entered the gigawatt-era a few years ago. The PV sector is currently preparing for the 'real thing', i.e. the terawattscale manufacturing and installation that is needed for substantial impact on a global level. For that reason sustainability is now high on the list of development priorities, next to cost reduction and performance enhancement. Clearly terawatt-scale use is impossible, or at least undesirable, if certain sustainability criteria are not met. It would also severely affect the credibility of PV as a solution for sustainability related problems of society. The challenge is to translate this general concept into concrete actions that are useful for research, manufacturing, installation and other parts of the PV value chain. An important and famous definition of the concept of 'sustainability', or rather of 'sustainable development' has been given in the Brundtland Report: development that meets the needs of the present without compromising the ability of future generations to meet their own needs. Although this definition catches an essential aspect of 'sustainability', it does not give concrete leads for the difficult choices that have to be made in everyday life in general, and in solar energy technology development and deployment in particular. Many other, more specific definitions and descriptions have also been developed, especially related to the narrower term 'environmental sustainability'. Unfortunately, but not unexpectedly, these do not give final answers to the questions either. This leads to strong and sometimes emotional debates, but also to confusion and misunderstanding among specialists as well as non-specialists. Dealing with (or managing) these aspects of PV and using them to define the best development agenda, has become an important challenge for the PV sector. In the following report a few important aspects are discussed in some more detail.

  16. Transport náboje v Ta2O5 oxidových nanovrstvách s aplikací na tantalové kondenzátory

    OpenAIRE

    Kopecký, Martin

    2015-01-01

    Studium transportu náboje v Ta2O5 oxidových nanovrstvách se zaměřuje především na objasnění vlivu defektů na vodivost těchto vrstev. Soustředíme se na studium oxidových nanovrstev Ta2O5 vytvořených pomocí anodické oxidace. Proces výroby Ta2O5 zahrnuje řadu parametrů, jež ovlivňují koncentraci defektů (oxidových vakancí) v této struktuře. Vrstva oxidu Ta2O5 o tloušťce 20 až 200 nm se často používá jako dielektrikum pro tantalové kondenzátory, které se staly nedílnou součástí elektrotechnického...

  17. Identification of future engineering-development needs of alternative concepts for magnetic-fusion energy

    International Nuclear Information System (INIS)

    A qualitative identification of future engineering needs of alternative fusion concepts (AFCs) is presented. These needs are assessed relative to the similar needs of the tokamak in order to emphasize differences in required technology with respect to the well documented mainline approach. Although nearly thirty AFCs can be identified as being associated with some level of reactor projection, redirection, refocusing, and general similarities can be used to generate a reduced AFC list that includes only the bumpy tori, stellarators, reversed-field pinches, and compact toroids. Furthermore, each AFC has the potential of operating as a conventional (low power density, superconducting magnets) or a compact, high-power-density (HPD) system. Hence, in order to make tractable an otherwise difficult task, the future engineering needs for the AFCs are addressed here for conventional versus compact approaches, with the latter being treated as a generic class and the former being composed of bumpy tori, stellarators, reversed-field pinches, and compact toroids

  18. Finite-Larmor-radius stability theory of EBT plasmas

    International Nuclear Information System (INIS)

    An eikonal ballooning-mode formalism is developed to describe curvature-driven modes of hot electron plasmas in bumpy tori. The formalism treats frequencies comparable to the ion-cyclotron frequency, as well as arbitrary finite Larmor radius and field polarization, although the detailed analysis is restricted to E/sub parallel/ = 0. Moderate hot-electron finite-Larmor-radius effects are found to lower the background beta core limit, whereas strong finite-Lamor-radius effects produce stabilization

  19. The strange rebirth of Tory England

    OpenAIRE

    Gamble, Andrew

    2011-01-01

    The Conservative party’s long dominance of British politics was overturned after 1992. The party suffered three consecutive election defeats, the first time this had happened in the modern era, and it seemed to lack the capacity to recover. After the 2005 defeat, however, the party under David Cameron has begun to seize back the political initiative from Labour. Cameron’s leadership is assessed against the background of the long Conservative hegemony, and the undermining of the five key pilla...

  20. Non-planar string networks on tori

    International Nuclear Information System (INIS)

    Type II strings in D=5 contain particle-like 1/8 supersymmetric BPS states. In this note we give a string-network representation of such states by considering (periodic) non-planar (p,q,r)-string networks of eight dimensional type II string theory on T3. We obtain the BPS mass formula of such states, in terms of charges and generating-vectors of the torus, and show its invariance under an SL(3, Z)XSL(3, Z) group of transformations. Results are then generalized to string-networks associated with the SL(5, Z) U-duality in seven dimensions. We also discuss reinterpretation of the above (D=5) mass formula in terms of BPS states in world-volume theories of U2-branes in D=8. (author)

  1. TRANSIT OF EXOMOON PLASMA TORI: NEW DIAGNOSIS

    International Nuclear Information System (INIS)

    In the solar system, moons largely exceed planets in number. The Kepler database has been shown to be sensitive to exomoon detection down to the mass of Mars, but the first search has been unsuccessful. Here, we use a particles-in-cell code to predict the transit of the plasma torus produced by a satellite. Despite the small size of a moon, the spatial extent of its plasma torus can be large enough to produce substantial transit absorptions. The model is used for the interpretation of Hubble Space Telescope early ingress absorptions apparently observed during the WASP-12 b and HD 189733 b UV transits for which no consistent explanation exists. For HD 189733 b an exomoon transiting ∼16 Rp ahead of the planet and loading ∼1029 C II ions s–1 into space is required to explain the tentative early ingress absorption observed for C II. For WASP-12b, a moon transiting ∼6 Rp ahead from the planet and ejecting ∼1028 Mg II ions per second is required to explain the NUV early ingress absorption feature. Interestingly, both HD 189733 b and WASP-12b predicted satellites are outside the Hill sphere of their planets, an indication that the moons, if present, were not formed in situ but probably captured later. Finally, our simulations show a strong electromagnetic coupling between the polar regions of planets and the orbital position of the moons, an expected outcome of the unipolar induction DC circuit model. Future observations should test our predictions with a potential opportunity to unambiguously detect the first exomoon plasma torus

  2. Levi-Civita's Theorem for Noncommutative Tori

    Directory of Open Access Journals (Sweden)

    Jonathan Rosenberg

    2013-11-01

    Full Text Available We show how to define Riemannian metrics and connections on a noncommutative torus in such a way that an analogue of Levi-Civita's theorem on the existence and uniqueness of a Riemannian connection holds. The major novelty is that we need to use two different notions of noncommutative vector field. Levi-Civita's theorem makes it possible to define Riemannian curvature using the usual formulas.

  3. Monodromy and isotopy of monotone Lagrangian tori

    OpenAIRE

    Yau, Mei-Lin

    2008-01-01

    We define new Hamiltonian isotopy invariants for a monotone Lagrangian torus embedded in a symplectic 4-manifold. We show that, in the standard symplectic 4-space, these invariants distinguish a monotone Clifford torus from a Chekanov torus.

  4. Riemann surfaces and totally real tori

    OpenAIRE

    Duval, Julien; Gayet, Damien

    2009-01-01

    Given a generic totally real torus unknotted in the unit sphere of the complex plane, we prove the following alternative : either there exists a filling of the torus by holomorphic discs and the torus is rationally convex, or its rational hull contains a holomorphic annulus.

  5. Vertex disjoint routings of cycles over tori

    OpenAIRE

    Bermond, Jean-Claude; Yu, Min-Li

    2007-01-01

    International audience We study the problem of designing a survivable WDM network based on covering the communication requests with subnetworks that are protected independently from each other. We consider here the case when the physical network is $T(n)$, a torus of size $n$ by $n$, the subnetworks are cycles and the communication scheme is all-to-all or total exchange (where all pairs of vertices communicate). We will represent the communication requests by a logical graph: a complete gr...

  6. Twin tori for a new bundle divertor

    International Nuclear Information System (INIS)

    A new bundle divertor system using the straight stagnation axis in toroidal field together with the uniform field along the axis is discussed in detail. We call this type of divertor as the ''muffler divertor'' because of its shape. (author)

  7. Levi-Civita's Theorem for Noncommutative Tori

    OpenAIRE

    Jonathan Rosenberg

    2013-01-01

    We show how to define Riemannian metrics and connections on a noncommutative torus in such a way that an analogue of Levi-Civita's theorem on the existence and uniqueness of a Riemannian connection holds. The major novelty is that we need to use two different notions of noncommutative vector field. Levi-Civita's theorem makes it possible to define Riemannian curvature using the usual formulas.

  8. Softwarové syntetizátory

    OpenAIRE

    Vávra, Jan

    2011-01-01

    The aim of the diploma thesis is to survey this niche market. The study was primary focused on software synthesizers. To evaluate the synthesizers a quantitative survey was done. Outputs of the survey resulted into specification of requirements for the software programmes for music composing and identification of respondents. The hypothesis concerning users of software synthesizers themselves was defined and evaluated by statistical methods. Following the hypothesis correlations between each ...

  9. Letecké aktuátory

    OpenAIRE

    Jetela, Václav

    2014-01-01

    Bakalářská práce s názvem „Letecké aktuátory“ se v první části zabývá uceleným přehledem hydraulicky a elektricky poháněných aktuátorů používaných v letectví. Druhá část práce je věnována přehledu leteckých hydraulických okruhů. Jednotlivé kapitoly obsahují popis funkce a schémata. V následujících kapitolách práce jsou zpracovány návrhy testovacího standu pro zkoušení provozních parametrů aktuátorů. Závěr práce je věnován srovnání jednotlivých aktuátorů dle výkonu použití v letadlech....

  10. TRANSIT OF EXOMOON PLASMA TORI: NEW DIAGNOSIS

    Energy Technology Data Exchange (ETDEWEB)

    Ben-Jaffel, Lotfi [UPMC, University of Paris 06, UMR 7095, Institut d' Astrophysique de Paris, F-75014 Paris (France); Ballester, Gilda E., E-mail: bjaffel@iap.fr, E-mail: gilda@pirl.lpl.arizona.edu [Lunar and Planetary Laboratory, University of Arizona, 1541 E. University Blvd, Tucson, AZ 85721-0063 (United States)

    2014-04-20

    In the solar system, moons largely exceed planets in number. The Kepler database has been shown to be sensitive to exomoon detection down to the mass of Mars, but the first search has been unsuccessful. Here, we use a particles-in-cell code to predict the transit of the plasma torus produced by a satellite. Despite the small size of a moon, the spatial extent of its plasma torus can be large enough to produce substantial transit absorptions. The model is used for the interpretation of Hubble Space Telescope early ingress absorptions apparently observed during the WASP-12 b and HD 189733 b UV transits for which no consistent explanation exists. For HD 189733 b an exomoon transiting ∼16 R{sub p} ahead of the planet and loading ∼10{sup 29} C II ions s{sup –1} into space is required to explain the tentative early ingress absorption observed for C II. For WASP-12b, a moon transiting ∼6 R{sub p} ahead from the planet and ejecting ∼10{sup 28} Mg II ions per second is required to explain the NUV early ingress absorption feature. Interestingly, both HD 189733 b and WASP-12b predicted satellites are outside the Hill sphere of their planets, an indication that the moons, if present, were not formed in situ but probably captured later. Finally, our simulations show a strong electromagnetic coupling between the polar regions of planets and the orbital position of the moons, an expected outcome of the unipolar induction DC circuit model. Future observations should test our predictions with a potential opportunity to unambiguously detect the first exomoon plasma torus.

  11. Compression fractures of the vertebrae during a "bumpy" boat ride.

    LENUS (Irish Health Repository)

    Chukwunyerenwa, C K

    2012-01-31

    INTRODUCTION: Compression fracture of the vertebrae is common, often the result of falls from height and motor vehicle accidents in the younger age groups. It can occur following minor trauma in the elderly and in those with osteoporosis. MATERIALS AND METHODS: We present an interesting case of compression fracture of the vertebral bodies occurring simultaneously in a couple during a boat ride while on holiday. One individual had fracture of the T8, while the other fractured the L1 vertebrae. Both injuries were treated conservatively with Taylor braces. CONCLUSION: We highlight one of the potential hazards of this recreational activity, and the almost identical fracture pattern in this couple.

  12. Entropy production, viscosity bounds and bumpy black holes

    CERN Document Server

    Hartnoll, Sean A; Santos, Jorge E

    2016-01-01

    The ratio of shear viscosity to entropy density, $\\eta/s$, is computed in various holographic geometries that break translation invariance (but are isotropic). The shear viscosity does not have a hydrodynamic interpretation in such backgrounds, but does quantify the rate of entropy production due to a strain. Fluctuations of the metric components $\\delta g_{xy}$ are massive about these backgrounds, leading to $\\eta/s < 1/(4\\pi)$ at all finite temperatures (even in Einstein gravity). As the temperature is taken to zero, different behaviors are possible. If translation symmetry breaking is irrelevant in the far IR, then $\\eta/s$ tends to a constant at $T=0$. This constant can be parametrically small. If the translation symmetry is broken in the far IR (which nonetheless develops emergent scale invariance), then $\\eta/s \\sim T^{2 \

  13. Theoretical studies of Elmo Bumpy Torus. Annual report

    International Nuclear Information System (INIS)

    The work was divided into six basic areas. Modeling studies compared neoclassical and Fokker-Planck analyses of the core plasma electrons with EBT-S data. Ion physics studies treated propagation and absorption of ion cyclotron waves along with investigation of the effect of wave absorption and instabilities on the ion distribution function. Parametric instability calculations identified processes and thresholds for nonlinear electron cyclotron resonance (ECR) wave absorption. Ring physics studies considered not only energetics and spatial effects, but also scaling and startup scenarios, along with the attendant microwave power requirements. Radio frequency (RF) control studies considered the possibility of influencing transport by wave absorption; related studies produced the important predictions of RF stabilization of interchange modes, without ponderomotive effects. Finally, microwave deposition studies considered the geometric aspects of propagation and absorption of microwaves in a real EBT cavity system

  14. Confinement heating and stability in the ELMO Bumpy Torus (EBT)

    International Nuclear Information System (INIS)

    The effects of heating methods, stability, neoclassical transport, nonadiabaticity, and ring power balance on the performance of an EBT reactor are discussed. Core plasma beta values in the range 10 to 15% have been estimated, but the reliability and importance of these estimates remain to be determined by future experiments and form a key objective for the EBT Proof-of-Principle (EBT-P) device. Potential variations on the basic EBT configuration that were expected to enhance reactor performance are discussed

  15. Scare of Avian Flu Revisits India: A Bumpy Road Ahead

    Directory of Open Access Journals (Sweden)

    Rajnish Kumar Rai

    2008-04-01

    Full Text Available With the threat of an avian flu pandemic once again looming over eastern India, issues regarding patents and affordability and accessibility of drugs have taken center stage. The key priority of India should be to remain prepared to address the public health crisis effectively, by stockpiling the drug tamiflu so that it can be easily distributed and administered to the needy.India had been confronted with a serious threat of avian flu in 2005-06, but past experience shows that, despite having some of the broadest and most comprehensive compulsory patent licensing laws, India's policymaking elite shied away from fully exploiting these legal 'flexibilities.' Fortunately, the danger of avian flu did not turn into a substantial public health crisis that year. Under this backdrop, this paper explores various ‘flexibilities’ available in the Indian patent law and suggests short term and long term strategies to effectively tackle the impending danger of an avian flu pandemic, and similar public health crises in future. This paper will discuss potential areas of conflict between the indigenous generic drug firms and the multi-national companies with respect to TRIPS compliance in the event that these flexibilities are exploited. This paper also highlights the administrative constraints and the economic viability of the compulsory licensing system. Finally, this paper shows how political will is often more critical than having well documented provisions in statute books to respond to such situations effectively.

  16. Understanding normal development of adolescent sexuality: A bumpy ride

    Directory of Open Access Journals (Sweden)

    Sujita Kumar Kar

    2015-01-01

    Full Text Available Adolescence, derived from the Latin word "adolescere" meaning "to grow up" is a critical developmental period. During adolescence, major biological as well as psychological developments take place. Development of sexuality is an important bio-psycho-social development, which takes an adult shape during this period. During adolescence, an individual′s thought, perception as well as response gets colored sexually. Puberty is an important landmark of sexuality development that occurs in the adolescence. The myriad of changes that occurs in adolescents puts them under enormous stress, which may have adverse physical, as well as psychological consequences. Understanding adolescent sexuality has important clinical, legal, social, cultural, as well as educational implications.

  17. A successful international cooperation with a bumpy start

    Institute of Scientific and Technical Information of China (English)

    Ming Li

    2011-01-01

    Science has no boarders.The saying could not be more accurate in the case of infectious disease research.It is publicly known that infectious diseases can travel,not only through infected people,animals or insects,but also by commercial shipments.In the era of globalization,it is not possible to fight infectious diseases in one nation without worrying about what is happening elsewhere in the world.Emerging and re-emerging infectious diseases such as the outbreak of SARS in 2003 are likely to panic the Asian society at any time.To fight these diseases,the Chinese Academy of Sciences (CAS) and the University of Tokyo (UT) launched China-Japan Collaboration on Emerging and Re-emerging Infectious Diseases in 2005,as part of the Program of Founding Research Centers for Emerging and Re-emerging Infectious Diseases supported by Japan Ministry of Education,Science,Sports and Technology (MEXT).

  18. The Big Bumpy Shift: Digital Music via Mobile Internet

    OpenAIRE

    Dolan, Daniel P.

    2000-01-01

    The promise and rise of mobile Internet technologies and markets will be remembered as one of the most profound global information technology developments of the next few years. Mobile Internet technologies and practical applications necessary for widespread public use are advancing rapidly in Japan and are likely to catch on quickly in other countries. The remarkable adoption of mobile Internet in Japan and the popularity of digital music file sharing services such as Napster in the United S...

  19. Alternative approaches to plasma confinement

    Science.gov (United States)

    Roth, J. R.

    1978-01-01

    The paper discusses 20 plasma confinement schemes each representing an alternative to the tokamak fusion reactor. Attention is given to: (1) tokamak-like devices (TORMAC, Topolotron, and the Extrap concept), (2) stellarator-like devices (Torsatron and twisted-coil stellarators), (3) mirror machines (Astron and reversed-field devices, the 2XII B experiment, laser-heated solenoids, the LITE experiment, the Kaktus-Surmac concept), (4) bumpy tori (hot electron bumpy torus, toroidal minimum-B configurations), (5) electrostatically assisted confinement (electrostatically stuffed cusps and mirrors, electrostatically assisted toroidal confinement), (6) the Migma concept, and (7) wall-confined plasmas. The plasma parameters of the devices are presented and the advantages and disadvantages of each are listed.

  20. Orientifold's landscape: non-factorisable six-tori

    International Nuclear Information System (INIS)

    We construct type IIA orientifolds on T6/Z2 x Z2 which admit non factorisable lattices. We describe a method to deal with this kind of configurations and discuss how the compactification lattice affects the tadpole cancellation conditions. Moreover, we include D6-branes which are not parallel to O6-planes. These branes can give rise to chiral spectra in four dimensions, thus uncovering a new corner in the landscape of intersecting D-brane model constructions. We demonstrate the construction at an explicit example. In general we argue that obtaining an odd number of families is problematic

  1. Charged Tori in Spherical Gravitational and Dipolar Magnetic Fields

    Czech Academy of Sciences Publication Activity Database

    Slaný, P.; Kovář, J.; Stuchlík, Z.; Karas, Vladimír

    2013-01-01

    Roč. 205, č. 1 (2013), 3/1-3/16. ISSN 0067-0049 R&D Projects: GA ČR(CZ) GC13-00070J Institutional support: RVO:67985815 Keywords : accretion * accretion disks * magnetic fields Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 14.137, year: 2013

  2. Finite-temperature string theory and twisted tori

    International Nuclear Information System (INIS)

    We show that the introduction of a finite temperature into string theory is mathematically equivalent to compactifying the timelike coordinate on a twisted torus of radius β/2π = 1/2πkT, the reciprocal of the temperature. We derive a general formula for the one-loop vacuum amplitude Λ(β) of a string theory compactified on a twisted torus that is manifestly modular invariant and is almost as easy to apply as in the compactification of a string theory on an ordinary torus. The connection with statistical mechanics is made through the formula lnZ(β) = -βVΛ(β) where Z(β) is the partition function and V the volume of the system. We discuss how the function σ(E) which counts the number of string states of total energy E and plays a central role in the microcanonical ensemble can be computed by taking the inverse Laplace transform of Z(β) and we give estimates of σ(E) for low and high energy densities by this method. We study the effect of finite temperature on the effective potentials for different parameters which determine a string theory's compactification. As supersymmetry is broken at finite temperature these potentials are nontrivial. We study the effect of finite temperature on the Wilson loop mechanism for gauge symmetry breaking and find that for a supersymmetric theory compactified on a torus finite-temperature effects favor the trivial vacuum. Also the effective potential for the radius R of the torus becomes modified so as to be minimum at R = 0 or R = ∞. The introduction of interactions and curvature effects into our formalism is discussed

  3. MHD phenomena and transport of energetic ions in spherical tori

    International Nuclear Information System (INIS)

    Mechanisms of the in the influence of MHD events on the beam ions in moderate-β plasmas relevant to current experiments on NSTX are studied. Change of the neutron yield caused by particle redistribution is evaluated. Destabilizing effect of the trapped energetic ions on ideal and non-ideal MHD modes in high-β plasmas is predicted. (author)

  4. Radio frequency current drive for small aspect ratio tori

    International Nuclear Information System (INIS)

    Non-inductive current drive (CD) is required during plasma initiation and for current sustainment in NSTX. The physics of high harmonic fast waves (HHFW) and the design of an antenna system for NSTX are studied. It is found that the theoretical current drive efficiency for HHFW can be high, and a general survey of parameters gives a good target for the antenna design. The primary issue for HHFW during plasma initiation is loading since the CD efficiency is very high for low density plasmas. For high beta operation at full current launching in the usual manner from the equatorial plane may lead to marginal CD performance. However, advanced antenna designs exploiting the theoretical results show some promise for high beta operation. Two methods to optimize the CD efficiency have been explored. The first non-zero poloidal mode excitation, provides enhanced efficiency because of improved penetration and a reduction of detrimental trapped particle effects. A second, placement of the antenna away from the equatorial plane, can also be used to reduce trapped particle effects. These methods can be used separately or together, yielding potential improvements of more than a factor of 2 in CD efficiency for NSTX

  5. Radio Frequency Current Drive Considerations for Small Aspect Ratio Tori

    International Nuclear Information System (INIS)

    Noninductive current drive is required during plasma initiation and for current sustainment in the National Spherical Torus Experiment (NSTX). In this paper, the physics of high harmonic fast waves (HHFW) and the design of an antenna system for NSTX are considered using numerical models. For high current discharges in NSTX, the static magnetic field component in the poloidal direction varies widely during the discharge and can become comparable to the toroidal component in NSTX. Therefore, they calculate the plasma loading for a broad range of antenna and plasma geometries in a three-dimensional model, so that the results can be used to influence the antenna design. Two-dimensional calculations of the wave propagation and absorption in the core plasma indicate that the theoretical current drive efficiency for HHFW can be high, and a general survey of parameters gives a good target for the antenna design. The current drive efficiency calculation is sensitive to the equilibrium model because finite beta effects can substantially alter the calculation of the trapped particle fraction. Traditional methods of toroidally phasing an antenna array as well as poloidal phasing are studied to optimize the current drive efficiency for a range of equilibria. Non-zero poloidal model excitation is also found to affect the antenna performance and flexibility. Performance expectations for a preliminary antenna design are given

  6. AGN dust tori: the X-ray-infrared connection

    CERN Document Server

    Rowan-Robinson, Michael; Nandra, Kirpal

    2009-01-01

    We have combined the CLASX Chandra survey in Lockman with the Spitzer SWIRE survey data to study the X-ray-infrared connection for AGN. The sample consists of 401 X-ray-sources, of which 306 are detected by Spitzer, and a further 257 AGN candidates detected through their dust torus, but not by Chandra. For X-ray sources the X-ray hardness ratio has been modelled in terms of a power-law with absorption N(H). The optical and infrared data have been modelled in terms of our well-established optical galaxy and QSO templates, and infrared templates based on radiative transfer models. Our estimate of the N(H) distribution is consistent with other studies, but we do find a higher proportion of low absorption objects at z 0.5. While we find only one X-ray AGN with N(H) > 10^{24} cm^{-2}, we argue that 10 objects with torus luminosity apparently exceeding the bolometric X-ray to 3 \\mu m luminosity are strong candidates for being heavily absorbed in X-rays. We also estimate that at least half of the infrared-detected ...

  7. Steroidní modulátory NMDA receptoru

    Czech Academy of Sciences Publication Activity Database

    Černý, Ivan; Pouzar, Vladimír; Chodounská, Hana

    Ĺubochňa : Národný endokrinologický a diabetologický ústav v Ĺubochni, 2010. s. 22-22. [Imunoanalýza 2010. 14.06.2010-18.06.2010, Ĺubochňa] R&D Projects: GA MŠk(CZ) LC06077 Institutional research plan: CEZ:AV0Z40550506 Keywords : NMDA receptor * steroids Subject RIV: CC - Organic Chemistry

  8. Teerullitaktika kasutamisest riigieelarve arutamisel aastail 1998-2005 / Erkki Tori

    Index Scriptorium Estoniae

    Tori, Erkki

    2007-01-01

    Autor analüüsib Riigikogu nelja koosseisu kogemusi riigieelarve menetlemisel ning jõuab järeldusele, et valitsuskoalitsioonid on kasutanud teerullitaktikat ning teeb selle vähendamiseks ettepaneku muuta menetlusreeglistikku. Tabelid: 1998-2005. aasta riigieelarvesse esitatud ettepanekute edukus. Diagrammid, graafikud

  9. Curvature and geometric modules of noncommutative spheres and tori

    Science.gov (United States)

    Arnlind, Joakim

    2014-04-01

    When considered as submanifolds of Euclidean space, the Riemannian geometry of the round sphere and the Clifford torus may be formulated in terms of Poisson algebraic expressions involving the embedding coordinates, and a central object is the projection operator, projecting tangent vectors in the ambient space onto the tangent space of the submanifold. In this note, we point out that there exist noncommutative analogues of these projection operators, which implies a very natural definition of noncommutative tangent spaces as particular projective modules. These modules carry an induced connection from Euclidean space, and we compute its scalar curvature.

  10. Translated tori in the characteristic varieties of complex hyperplane arrangements

    OpenAIRE

    Suciu, Alexander I.

    1999-01-01

    We give examples of complex hyperplane arrangements for which the top characteristic variety contains positive-dimensional irreducible components that do not pass through the origin of the character torus. These examples answer several questions of Libgober and Yuzvinsky. As an application, we exhibit a pair of arrangements for which the resonance varieties of the Orlik-Solomon algebra are (abstractly) isomorphic, yet whose characteristic varieties are not isomorphic. The difference comes fro...

  11. Starbursts and dusty tori in distant 3CR radio galaxies

    CERN Document Server

    Podigachoski, P; Barthel, P D; Drouart, G; Fioc, M

    2016-01-01

    We present a study of the complete ultraviolet to submillimetre spectral energy distributions (SEDs) of twelve 3CR radio galaxy hosts in the redshift range $1.0 < z < 2.5$, which were all detected in the far-infrared by the Herschel Space Observatory. The study employs the new spectro-chemical evolutionary code P\\'EGASE.3, in combination with recently published clumpy AGN torus models. We uncover the properties of the massive host galaxy stellar populations, the AGN torus luminosities, and the properties of the recent starbursts, which had earlier been inferred in these objects from their infrared SEDs. The P\\'EGASE.3 fitting yields very luminous (up to 10$^{13}$L$_{\\odot}$) young stellar populations with ages of several hundred million years in hosts with masses exceeding 10$^{11}$M$_{\\odot}$. Dust masses are seen to increase with redshift, and a surprising correlation -- or better upper envelope behaviour -- is found between the AGN torus luminosity and the starburst luminosity, as revealed by their a...

  12. Effect of alpha particles on the stability of Elmo Bumpy Torus (EBT) reactor. Final report

    International Nuclear Information System (INIS)

    The macroscopic stability of an ignited EBT reactor is investigated by studying the effects of the alpha particles generated by the Deuterium-Tritium (D-T) fusion reaction on the background interchange mode, the interacting interchange mode, and the high-frequency compressional Alfven and coupled modes. A fluid description is used for the background plasma while a kinetic treatment is utilized for the hot electron species and the alpha particles. It is shown that the alphas tend to mildly destabilize the interacting interchange while stabilizing the background interchange due to their sizable Larmor radii. The destabilization is most pronounced when the beta of the alpha particles in highest, i.e., at birth, and recovery of stabilization takes place as these particles slow down toward thermalization. It is also shown that the alphas completely stabilize the high frequency modes so that it can safely be concluded that fusion alphas present no detrimental effects on the stability of an EBT reactor that possesses an appropriate hot electron ring for macroscopic stability

  13. International consensus on ANA patterns (ICAP): the bumpy road towards a consensus on reporting ANA results.

    Science.gov (United States)

    Damoiseaux, Jan; von Mühlen, Carlos A; Garcia-De La Torre, Ignacio; Carballo, Orlando Gabriel; de Melo Cruvinel, Wilson; Francescantonio, Paulo Luiz Carvalho; Fritzler, Marvin J; Herold, Manfred; Mimori, Tsuneyo; Satoh, Minoru; Andrade, Luis E C; Chan, Edward K L; Conrad, Karsten

    2016-12-01

    The International Consensus on ANA Patterns (ICAP) was initiated as a workshop aiming to thoroughly discuss and achieve consensus regarding the morphological patterns observed in the indirect immunofluorescence assay on HEp-2 cells. One of the topics discussed at the second ICAP workshop, and addressed in this paper, was the harmonization of reporting ANA test results. This discussion centered on the issue if cytoplasmic and mitotic patterns should be reported as positive or negative. This report outlines the issues that impact on two major different reporting methods. Although it was appreciated by all participants that cytoplasmic and mitotic patterns are clinically relevant, implications for existing diagnostic/classification criteria for ANA-associated diseases in particular hampered a final consensus on this topic. Evidently, a more concerted action of all relevant stakeholders is required. Future ICAP workshops may help to facilitate this action. PMID:26831867

  14. The bumpy road Max Planck from radiation theory to the quantum (1896-1906)

    CERN Document Server

    Badino, Massimiliano

    2015-01-01

    This book examines the different areas of knowledge, traditions, and conceptual resources that contributed to the building of Max Planck’s theory of radiation. It presents an insightful comparative analysis that not only sheds light upon a fundamental chapter in the history of modern physics, but also enlarges our understanding of how theoreticians work. Coverage offers a deep investigation into the technical aspects behind the theory and extends in time the notion of quantum revolution. It also presents a full-fledged discussion of the combinatorial part of Planck’s theory and places emphasis on the epistemological role of mathematical practices. By painstakingly reconstructing both the electromagnetic and the combinatorial part of Planck’s black-body theory, the author shows how some apparently merely technical resources, such as the Fourier series, effectively contributed to shape the final form of Planck’s theory. For decades, historians have debated the conditions of possibility of Max Planck’s...

  15. Quality-assurance approach for the Elmo Bumpy Torus Proof-of-Principal experiment

    International Nuclear Information System (INIS)

    Components, subsystems and systems will be subjected to inspection and test as necessary to ensure compliance to applicable specifications, Acceptance Test Procedures and/or customer requirements. Quality Assurance will inspect each component, subsystem and system for selected mechanical and electrical defects. In addition, Quality Assurance will either perform, or verify performance of, and analyze, or verify analysis of, all required field and laboratory tests. If hardware is modified, repaired or replaced after final testing, necessary re-inspection and retest must be performed. Insofar as possible the component, subsystem or system will be released as acceptable upon completion of these activities. When nonconformances are detected during the course of site surveillance activities, MDAC or Gilbert/Commonwealth will initiate a Nonconformance Record for review by MDAC Quality Assurance and Project Engineering personnel. These nonconformances will be identified and dispositioned per MDAC Standard Practices with the advice and concurrence of Gilbert/Commonwealth personnel, if deemed appropriate. MDAC Quality Assurance personnel will witness the pre-operational testing and review the test data

  16. A bumpy road to the top: Statistically defining a peak in oil production

    International Nuclear Information System (INIS)

    Twenty-four countries where oil production is in decline were identified. A simple metric of the volatility of oil production on the upslope of their production curves, called decline as a proportion of pre-peak production (or PPPmax), was created. PPPmax was determined for the post-peak countries and plotted as a frequency distribution. PPPmax varied from 0–56%, but was skewed toward the lower part of the range (median 6.2%). As global production is determined by the total contribution of production from all countries, the variation in PPPmax will represent the lower and upper bound of the “bumpiness” of global oil production. It also enables a retrospective approximation of the when global oil production is most likely past its peak. -- Highlights: •Oil production is volatile which makes it difficult to determine peak production. •A measure of volatility based on oil production figures is described (PPPmax). •A frequency distribution of PPPmax gives insight into national production profiles. •PPPmax elucidates global production

  17. Five years on the bumpy road delivering well chemicals for zero harmful discharge

    Energy Technology Data Exchange (ETDEWEB)

    Selle, Olav M.; Paltiel, Sten; Saeten, Jens O.; Nasvik, Haavard

    2006-03-15

    This is a summary of five years development work to qualify environmentally acceptable well chemicals for Heidrun. We will describe the situation as we started the work, what strategy we followed and the ups and downs we experienced as we went along. The focus is on scale inhibitors, scale dissolvers, acid formulations, viscosified fluids and chemicals for zonal isolation/shut-off purposes. The challenge has been to develop biodegradable and low toxic chemicals with equal or better effectiveness and with a reasonable prize compare to {sup b}est in class{sup -}products. The impact this has provided for zero harmful discharge to sea at Haltenbanken will be presented, to show the status as we are entering into year 2005. (Author)

  18. Bumpy Application of Utility Code for Genomic Inventions: With Special Reference to Express Sequence Tags

    Directory of Open Access Journals (Sweden)

    M R Sreenivasa Murthy

    2013-12-01

    Full Text Available Genomics, a new bough of biotechnology responsible for gene mapping has acquired a rapid significance in the field of patents. Brisk growth of patent filing in genomic subject matter is raising serious concerns about their utility from the perspective of societal benefit. Though the genomic related patent application qualifies the criterion of invention and non-obviousness in major instances, the inventors are unable to satisfy the utility criterion. Some instances such as patent application for ESTs have no utility at all. The patent regulators constructed various tests to deal with the situation such as specificity, substantiality (real world credibility tests etc. Hoverer, it is noteworthy that an attempt to uniform the standard of utility test for genomic inventions especially in the field of ESTs, cloning and creation of chimeras, has been made by America and Europe through specific regulations. Thus, the objective of this paper is firstly, to explain the importance of biotechnology and genomic inventions for mankind and significance of ESTs for future research. Secondly, to analyze the application of Utility code prior to the emergence of Utility code in America and Europe. Thirdly to scrutinize the Utility code in both countries and their implication on aftermath cases, and. fourthly and finally, to critically evaluate the both countries utility pathways in the light of societal benefit.

  19. Ion tails and lower-hybrid-drift turbulence in the ELMO Bumpy Torus

    International Nuclear Information System (INIS)

    It is demonstrated that a low level of lower-hybrid-drift waves could explain the hot-ion tails observed in EBT; the tail temperature is related to the lower-hybrid-drift wave energy. The effect of these waves on the bulk ion distribution is also analyzed

  20. The bumpy road toward low-energy urban mobility: Case studies from two UK cities

    OpenAIRE

    Tim Schwanen

    2015-01-01

    Cities are increasingly seen as the places where innovations that can trigger a sociotechnical transition toward urban mobility are emerging and maturing. Processes such as peak car, rail renaissance and cycling boom manifest themselves particularly in cities, and success stories of cities experimenting with specific types of low-energy mobility abound in the academic literature. Nonetheless, innovation is known to be a precarious process requiring favorable circumstances. Using document anal...

  1. Bap re Bap! Driving Experiences through Multimodal Unruly Traffic on Bumpy Roads

    OpenAIRE

    N. AHMED; Iftekhar, L; Ahmed, S.; Rahman, R; Reza, T; Shoilee, S; Choudhury, CF

    2015-01-01

    Congestion, lack of compliance to traffic laws, multimodal traffic, opportunistic decision making and poor road conditions are few of the key challenges faced by drivers in a developing country's metropolitan city such as, Dhaka, Bangladesh. The driver's experience is affected by such road conditions which in turn shapes up their driving behavior and thus affects the traffic conditions which has been studied using sensor enabled tools as well as qualitative methods from a developing country's...

  2. Elmo Bumpy Torus proof of principle. Phase II - title 1 report. Volume I. Device summary

    International Nuclear Information System (INIS)

    This document presents a summary of the EBT-P Preliminary Design (Title I) effort. The work was performed, under the direction of ORNL, for the Department of Energy by MDAC-St. Louis. Major subcontractors assisting MDAC included General Dynamics for the magnet system, Gilbert Associates for the device utilities and facility architecture and engineering, and Lockheed - Oak Ridge for engineering support services. The Title I period of performance was from 1 October 1980 to 1 March 1982

  3. Actually the World Is Quite Bumpy: Using Friedman in the International Business Law Classroom

    Science.gov (United States)

    Dhooge, Lucien J.

    2006-01-01

    In "The World Is Flat: A Brief History of the Twenty-First Century," Pulitzer Prize recipient and New York Times foreign affairs correspondent Thomas L. Friedman examines the evolution of globalization in the six years since the publication of his highly acclaimed introduction to the topic in "The Lexus and the Olive Tree: Understanding…

  4. Elmo Bumpy Torus proof of principle, Phase II: Title 1 report. Volume II. Toroidal vessel

    International Nuclear Information System (INIS)

    The Toroidal Vessel provides the vacuum enclosure for containing the high temperature steady state plasma. In addition, the Toroidal Vessel must provide several viewing ports for plasma diagnostics, vacuum pumping ports for both high vacuum and roughing vacuum, feed-through ports for ECRH waveguides, limiter feed throughs for cooling and supporting the limiters, and ports for ion gages. The vessel must operate in an intense environment comprised of x-rays, microwaves, magnetic fields and plasma heat loads as well as the atmosphere pressure and gravity loads and the internal thermal stress loads due to heating and cooling of the torus. A key issue addressed was the choice of vacuum vessel seal and wall materials. In addition, during the course of the study, ORNL requested that horsecollar diagnostic ports be incorporated in the design. A comprehensive trade study was performed considering the vessel material issues in concert with the impact of the horsecollar port design. A change in baseline from an aluminum vessel with elastomer seals and circular diagnostic ports to austenitic stainless steel vessel with metal seals and horsecollar ports was agreed upon by both MDAC and ORNL towards the end of Title I

  5. Dvandvas, Blocking, and the Associative: The Bumpy Ride from Phrase to Word

    Science.gov (United States)

    Kiparsky, Paul

    2010-01-01

    The oldest form of Sanskrit has a class of expressions that are in some respects like asyndetically coordinated syntactic phrases, in other respects like single compound words. I propose to resolve the conflicting evidence by drawing on prosodic phonology, stratal optimality theory, and the lexicalist approach to morphological blocking. I then…

  6. Elmo Bumpy Torus physics. Interim technical report, May 24, 1983-October 1, 1983

    International Nuclear Information System (INIS)

    This progress report covers the technical work performed during the initial funding period of the contract, May 24-October 1, 1983. The contract presently includes work on three tasks: T-M Transition studies on EBT-S, pulsed high density experiments on EBT-S, and theoretical studies of ion rings in EBT. The work on Task 2 consisted of developing a preliminary plan for the pulsed experiments and some exploratory experimental runs on EBT-S. Within the Task 3 effort considerable work was accomplished on ion ring formation. This work was able to benefit from previous research and code development done at MDAC. This report also covers preliminary results on investigation of stabilization of ballooning and interchange modes by high energy rings. This investigation is particularly important for ion rings because, should stabilization properties depend on ion energy in the rings, the required ion energies could be important in power balance considerations

  7. Bumpy Spin-Down of Anomalous X-Ray Pulsars The Link with Magnetars

    CERN Document Server

    Melatos, A

    1999-01-01

    The two anomalous X-ray pulsars (AXPs) with well-sampled timing histories, 1E 1048.1-5937 and 1E 2259+586, are known to spin down irregularly, with `bumps' superimposed on an overall linear trend. Here we show that if AXPs are non-accreting magnetars, i.e. isolated neutron stars with surface magnetic fields B_0 > 10^{10} T, then they spin down electromagnetically in exactly the manner observed, due to an effect called `radiative precession'. Internal hydromagnetic stresses deform the star, creating a fractional difference epsilon=(I_3-I_1)/I_1 ~ 10^{-8} between the principal moments of inertia I_1 and I_3; the resulting Eulerian precession couples to an oscillating component of the electromagnetic torque associated with the near-zone radiation fields, and the star executes an anharmonic wobble with period tau_pr ~ 2 pi / epsilon Omega(t) ~ 10 yr, where Omega(t) is the rotation frequency as a function of time t. We solve Euler's equations for a biaxial magnet rotating in vacuo; show that the computed Omega(t) ...

  8. The Bumpy Road toward Low-Energy Urban Mobility: Case Studies from Two UK Cities

    Directory of Open Access Journals (Sweden)

    Tim Schwanen

    2015-06-01

    Full Text Available Cities are increasingly seen as the places where innovations that can trigger a sociotechnical transition toward urban mobility are emerging and maturing. Processes such as peak car, rail renaissance and cycling boom manifest themselves particularly in cities, and success stories of cities experimenting with specific types of low-energy mobility abound in the academic literature. Nonetheless, innovation is known to be a precarious process requiring favorable circumstances. Using document analysis and in-depth interviews, this study examines the nature of low-energy innovation in the everyday mobility of people in two UK cities with favorable conditions for a transition away from fossil fuels—Brighton and Oxford. It shows that clear differences exist between the two cities in the sorts of innovation that emerge and diffuse as a result of path dependencies, local politics, and financial support from supra-local governments and agencies. While low-energy mobility currently has substantial momentum in both cities, the majority of low-carbon innovations in urban mobility are incremental rather than radical in nature, and their future is often imbued with uncertainty. The autonomy of small- and medium-sized cities as agents in bringing about transformational change toward low-energy urban mobility should not be overestimated.

  9. Elmo Bumpy Torus proof of principle, Phase II: Title 1 report. Volume VIII. Device utilities

    International Nuclear Information System (INIS)

    This report describes the activities conducted during the Preliminary Design Period for the Device Utilities Systems. All GAI preliminary specifications, drawings, and reports (listed in Section 4.0) have been transmitted to ORNL for review and approval. Device Utility Systems Descriptions are also presented in Section 4.0. The GAI Device Enclosure Gamma Radiation Analysis is presented in Appendix B. Pending design criteria revisions are described in Section 6.0. A type B Change Notice Request (CNR) has been transmitted to GAI. The Type B CNR authorizes cost and schedule assessment for each revision identified. Formal Proposed Design Changes (PDC's) will be provided to ORNL when this data is available

  10. Fusion energy division annual progress report, period ending December 31, 1980

    Energy Technology Data Exchange (ETDEWEB)

    1981-11-01

    The ORNL Program encompasses most aspects of magnetic fusion research including research on two magnetic confinement programs (tokamaks and ELMO bumpy tori); the development of the essential technologies for plasma heating, fueling, superconducting magnets, and materials; the development of diagnostics; the development of atomic physics and radiation effect data bases; the assessment of the environmental impact of magnetic fusion; the physics and engineering of present-generation devices; and the design of future devices. The integration of all of these activities into one program is a major factor in the success of each activity. An excellent example of this integration is the extremely successful application of neutral injection heating systems developed at ORNL to tokamaks both in the Fusion Energy Division and at Princeton Plasma Physics Laboratory (PPPL). The goal of the ORNL Fusion Program is to maintain this balance between plasma confinement, technology, and engineering activities.

  11. Fusion energy division annual progress report, period ending December 31, 1980

    International Nuclear Information System (INIS)

    The ORNL Program encompasses most aspects of magnetic fusion research including research on two magnetic confinement programs (tokamaks and ELMO bumpy tori); the development of the essential technologies for plasma heating, fueling, superconducting magnets, and materials; the development of diagnostics; the development of atomic physics and radiation effect data bases; the assessment of the environmental impact of magnetic fusion; the physics and engineering of present-generation devices; and the design of future devices. The integration of all of these activities into one program is a major factor in the success of each activity. An excellent example of this integration is the extremely successful application of neutral injection heating systems developed at ORNL to tokamaks both in the Fusion Energy Division and at Princeton Plasma Physics Laboratory (PPPL). The goal of the ORNL Fusion Program is to maintain this balance between plasma confinement, technology, and engineering activities

  12. Elmo Bumpy Torus proof of principle, Phase II: Title 1 report. Volume V. Vacuum-pumping system. Preliminary design report

    International Nuclear Information System (INIS)

    This report summarizes Title I Preliminary Design of the EBT-P Vacuum Pumping System. The Vacuum Pumping System has been designed by the McDonnell Douglas Astronautics Co. - St. Louis (MDAC). It includes the necessary vacuum pumps and vacuum valves to evacuate the torus, the Mirror Coil Dewars (MC Dewars), and the Gyrotron Magnet Dewars. The pumping ducts, manifolds, and microwave protection system are also included. A summary of the function of each subsystem and a description of its principle components is provided below. The analyses performed during the system design are also identified

  13. Four Goals of School Reform in the Soviet Union, 1984-1989: A Bumpy Journey for "Perestroika".

    Science.gov (United States)

    Wilson, Joan B.

    Examined is the progress of four major goals of school reform in the Soviet Union as an integral part of Soviet leader Mikhail S. Gorbachev's call for a monumental restructuring (perestroika) of society. With the adoption of Fundamental Directions of General Education and Vocational School Reform (1984), four important goals were set in motion;…

  14. Office of Fusion Energy recommendations on the Elmo Bumpy Torus proof-of-principle experiment site selection

    Energy Technology Data Exchange (ETDEWEB)

    None

    1980-09-09

    This report provies background information and rationale for the procedures used and decisions made up to this point. A brief history and technical description of the EBT concept are given. The OFE recommendations as to siting are included. (MOW)

  15. A bumpy ride on the diagnostic bench of massive parallel sequencing, the case of the mitochondrial genome.

    Directory of Open Access Journals (Sweden)

    Kim Vancampenhout

    Full Text Available The advent of massive parallel sequencing (MPS has revolutionized the field of human molecular genetics, including the diagnostic study of mitochondrial (mt DNA dysfunction. The analysis of the complete mitochondrial genome using MPS platforms is now common and will soon outrun conventional sequencing. However, the development of a robust and reliable protocol is rather challenging. A previous pilot study for the re-sequencing of human mtDNA revealed an uneven coverage, affecting predominantly part of the plus strand. In an attempt to address this problem, we undertook a comparative study of standard and modified protocols for the Ion Torrent PGM system. We could not improve strand representation by altering the recommended shearing methodology of the standard workflow or omitting the DNA polymerase amplification step from the library construction process. However, we were able to associate coverage bias of the plus strand with a specific sequence motif. Additionally, we compared coverage and variant calling across technologies. The same samples were also sequenced on a MiSeq device which showed that coverage and heteroplasmic variant calling were much improved.

  16. Office of Fusion Energy recommendations on the Elmo Bumpy Torus proof-of-principle experiment site selection

    International Nuclear Information System (INIS)

    This report provies background information and rationale for the procedures used and decisions made up to this point. A brief history and technical description of the EBT concept are given. The OFE recommendations as to siting are included

  17. Elmo Bumpy Torus proof of principle. Phase II. Title 1 report. Volume III. Magnet system. Preliminary design report

    International Nuclear Information System (INIS)

    During Title I, General Dynamics' principal role as a subcontractor to the McDonnell Douglas Astronautics Company (MDAC) is to assist in the further development of a low-cost superconducting magnet mirror coil system for the EBT-P program consistent with long life and dependable operation. The activity can best be defined as an extension of ORNL's previous development program with further joint ORNL/MDAC/GDC refining of the mirror coil components. MDAC/GDC participation for the entire program can be subdivided into four distinct elements as follows: (1) design, development, and fabrication of two dewar subassemblies to enclose the ORNL developed and fabricated cold mass assemblies; (2) design, development, and fabrication of a production prototype magnet system including conductor (procurement), cold mass components, dewar and x-ray shield. This prototype would form the basis for the production of 36 magnets for the torus and three spares. (3) design, development, and fabrication of an electrical/electronic system including quench protection, instrumentation and control, and power supply to power and protect the mirror coil system during its operation in the torus; (4) fabrication of the 39 production magnets

  18. Elmo Bumpy Torus proof of principle, Phase II: Title 1 report. Volume IV. Microwave system. Preliminary design report

    International Nuclear Information System (INIS)

    The EBT-P Microwave System provides microwaves for electron cyclotron resonance heating (ECRH) to both stabilize and heat the EBT-P plasma. A 28 gigahertz (GHz) system is required to form the hot electron annulus plasma that provides MHD stabilization to the core plasma. A 60 GHz system is required to heat the core plasma and will provide some second harmonic heating of the hot electron annulus. The principal microwave system elements and their design characteristics are summarized. The microwave system includes 200 kilowatt (kW) gyrotrons at 60 GHz for core heating and 200 kW gyrotrons at 28 GHz for annulus heating. The basic operating complement will be six (6) 60 GHz tubes and two (2) 28 GHz tubes. PACE (Plant and Capital Equipment) procurement will include four (4) 60 GHz gyrotrons with two (2) GHz tubes procured under operations and the two (2) 28 GHz tubes will be provided, with mounts, from the EBT-S program. Each tube is rigidly mounted on an oil filled tank assembly which provides electrical isolation and cooling. All tubes and mounts will be located in the lower level of the torus enclosure. An extensive demineralized water flow system is required to provide gyrotron cooling

  19. Preservation and Recycling of Crust during Accretionary and Collisional Phases of Proterozoic Orogens: A Bumpy Road from Nuna to Rodinia

    Directory of Open Access Journals (Sweden)

    Kent C. Condie

    2013-05-01

    Full Text Available Zircon age peaks at 2100–1650 and 1200–1000 Ma correlate with craton collisions in the growth of supercontinents Nuna and Rodinia, respectively, with a time interval between collisions mostly <50 Myr (range 0–250 Myr. Collisional orogens are two types: those with subduction durations <500 Myr and those ≥500 Myr. The latter group comprises orogens with long-lived accretionary stages between Nuna and Rodinia assemblies. Neither orogen age nor duration of either subduction or collision correlates with the volume of orogen preserved. Most rocks preserved date to the pre-collisional, subduction (ocean-basin closing stage and not to the collisional stage. The most widely preserved tectonic setting in Proterozoic orogens is the continental arc (10%–90%, mean 60%, with oceanic tectonic settings (oceanic crust, arcs, islands and plateaus, serpentinites, pelagic sediments comprising <20% and mostly <10%. Reworked components comprise 20%–80% (mean 32% and microcratons comprise a minor but poorly known fraction. Nd and Hf isotopic data indicate that Proterozoic orogens contain from 10% to 60% of juvenile crust (mean 36% and 40%–75% reworked crust (mean 64%. Neither the fraction nor the rate of preservation of juvenile crust is related to the collision age nor to the duration of subduction. Regardless of the duration of subduction, the amount of juvenile crust preserved reaches a maximum of about 60%, and 37% of the volume of juvenile continental crust preserved between 2000 and 1000 Ma was produced in the Great Proterozoic Accretionary Orogen (GPAO. Pronounced minima occur in frequency of zircon ages of rocks preserved in the GPAO; with minima at 1600–1500 Ma in Laurentia; 1700–1600 Ma in Amazonia; and 1750–1700 Ma in Baltica. If these minima are due to subduction erosion and delamination as in the Andes in the last 250 Myr; approximately one third of the volume of the Laurentian part of the GPAO could have been recycled into the mantle between 1500 and 1250 Ma. This may have enriched the mantle wedge in incompatible elements and water leading to the production of felsic magmas responsible for the widespread granite-rhyolite province of this age. A rapid decrease in global Nd and in detrital zircon Hf model ages between about 1600 and 1250 Ma could reflect an increase in recycling rate of juvenile crust into the mantle; possibly in response to partial fragmentation of Nuna.

  20. Formation of dark matter tori around supermassive black holes via the eccentric Kozai-Lidov mechanism

    International Nuclear Information System (INIS)

    We explore the effects of long-term secular perturbations on the distribution of dark matter particles around supermassive black hole (BH) binaries. We show that in the hierarchical (in separation) three-body problem, one of the BHs and a dark matter particle form an inner binary. Gravitational perturbations from the BH companion, on a much wider orbit, can cause the dark matter particle to reach extremely high eccentricities and even get accreted onto the BH by what is known as the eccentric Kozai-Lidov (EKL) mechanism. We show that this may produce a torus-like configuration for the dark matter distribution around the less massive member of the BH binary. We first consider an intermediate BH (IMBH) in the vicinity of our galactic center, which may be a relic of a past minor merger. We show that if the IMBH is close enough (i.e., near the stellar disk) the EKL mechanism is very efficient in exciting the eccentricity of dark matter particles in near-polar configurations to extremely high values where they are accreted by the IMBH. We show that this mechanism is even more effective if the central BH grows in mass, where we have assumed adiabatic growth. Because near-polar configurations are disrupted, a torus-like shape is formed. We also show that this behavior is also likely to be relevant for supermassive BH binaries. We suggest that if the BHs are spinning, the accreted dark matter particles may linger in the ergosphere, and thereby generate self-annihilations and produce an indirect signature of potential interest.

  1. THE UTILIZATION OF THE THERAPEUTIC TOY IN THE NURSING OPERA TORY VISIT TO THE INFANT

    Directory of Open Access Journals (Sweden)

    Cláudia Silveira Viera

    2003-12-01

    Full Text Available The systematization of the peroperative nursing occurs in the moments pre, trans and postoperativeand also they happen in children, adolescents, adults and elders. Being like this, ours objective went verify thebenefits of the utilization of the therapeutic toy in the visit preoperative by the nurse of surgical center.

  2. Akumulátory energie pro blízkou budoucnost

    Czech Academy of Sciences Publication Activity Database

    Zajac, Jaromír

    -, č. 5 (2006), s. 14-15 Institutional research plan: CEZ:AV0Z20430508 Keywords : tokamak * power sources * energy accumulation Subject RIV: JE - Non-nuclear Energetics, Energy Consumption ; Use http://www.tretipol.cz/

  3. THE UTILIZATION OF THE THERAPEUTIC TOY IN THE NURSING OPERA TORY VISIT TO THE INFANT

    OpenAIRE

    Cláudia Silveira Viera; Marister Piccoli; Silvana Machiavelli Schmitz

    2003-01-01

    The systematization of the peroperative nursing occurs in the moments pre, trans and postoperativeand also they happen in children, adolescents, adults and elders. Being like this, ours objective went verify thebenefits of the utilization of the therapeutic toy in the visit preoperative by the nurse of surgical center.

  4. Vanadové články jako zdroje a akumulátory energie

    OpenAIRE

    Langr, Pavel

    2015-01-01

    Tato semestrální práce se zabývá problematikou průtokových redoxních baterií, zejména pak vanadových článků. První část se soustředí na vysvětlění základních pojmů, popisuje vanadové redoxní baterie a vysvětluje chemické procesy v nich. Zabývá se též jejich vlastnostmi a konstrukcí. Druhá část popisuje diagnostickou metodu spektroskopie, která se jeví jako velice perspektivní právě pro zkoumání vlastností vanadových článků. This semestral thesis deals with problematics of redox flow batter...

  5. Formation of dark matter tori around supermassive black holes via the eccentric Kozai-Lidov mechanism

    Energy Technology Data Exchange (ETDEWEB)

    Naoz, Smadar [Harvard Smithsonian Center for Astrophysics, Institute for Theory and Computation, 60 Garden St., Cambridge, MA 02138 (United States); Silk, Joseph, E-mail: snaoz@astro.ucla.edu [Institut d' Astrophysique de Paris, CNRS, UPMC Univ Paris 06, UMR7095, 98 bis, boulevard Arago, F-75014, Paris (France)

    2014-11-10

    We explore the effects of long-term secular perturbations on the distribution of dark matter particles around supermassive black hole (BH) binaries. We show that in the hierarchical (in separation) three-body problem, one of the BHs and a dark matter particle form an inner binary. Gravitational perturbations from the BH companion, on a much wider orbit, can cause the dark matter particle to reach extremely high eccentricities and even get accreted onto the BH by what is known as the eccentric Kozai-Lidov (EKL) mechanism. We show that this may produce a torus-like configuration for the dark matter distribution around the less massive member of the BH binary. We first consider an intermediate BH (IMBH) in the vicinity of our galactic center, which may be a relic of a past minor merger. We show that if the IMBH is close enough (i.e., near the stellar disk) the EKL mechanism is very efficient in exciting the eccentricity of dark matter particles in near-polar configurations to extremely high values where they are accreted by the IMBH. We show that this mechanism is even more effective if the central BH grows in mass, where we have assumed adiabatic growth. Because near-polar configurations are disrupted, a torus-like shape is formed. We also show that this behavior is also likely to be relevant for supermassive BH binaries. We suggest that if the BHs are spinning, the accreted dark matter particles may linger in the ergosphere, and thereby generate self-annihilations and produce an indirect signature of potential interest.

  6. Parogenerátory tlakovodních reaktorů

    OpenAIRE

    Michalica, Martin

    2015-01-01

    Tato bakalářská práce se zabývá popisem jednotlivých konstrukčních řešení parogenerátorů. V první části bakalářské práce je popsán počátek jaderného průmyslu v Rusku. Samostatná práce se věnuje jednotlivým konstrukčním řešením. Poslední kapitola detailně popisuje jednotlivé části parogenerátoru VVER 1000. Součástí práce je tvorba 3D modelu parogenerátoru VVER 1000, který bude sloužit jako učební pomůcka v projektu Cenelín. This bachelors thesis describes various designs of steam generators...

  7. Linn andis loa Osten Tori juurde kõrgete korrusmajade ehitamiseks / Askur Alas

    Index Scriptorium Estoniae

    Alas, Askur, 1973-

    2004-01-01

    Tallinna linnavalitsus kehtestas Pärnu maantee ja Alevi tänava nurga detailplaneeringu, mille kohaselt kerkivad sinna üks 9- ja üks 12-korruseline äri- ja kortermaja. Projekti koostas Tõnu Laigu OÜ-st QP Arhitektid

  8. Mid-infrared interferometry of 23 AGN tori: On the significance of polar-elongated emission

    CERN Document Server

    López-Gonzaga, N; Tristram, K R W; Meisenheimer, K; Schartmann, M

    2016-01-01

    Context. Detailed high resolution studies of AGN with mid-infrared (MIR) interferometry have revealed parsec-sized dust emission elongated in the polar direction in four sources. Aims. Using a larger, coherently analyzed sample of AGN observed with MIR interferometry, we aim to identify elongated mid-infrared emission in a statistical sample of sources. More specifically we wish to determine if there is indeed a preferred direction of the elongation and whether this direction is consistent with a torus-like structure or with a polar emission. Methods. We investigate the significance of the detection of an elongated shape in the MIR emission by fitting elongated Gaussian models to the interferometric data at 12 um. We pay special attention to 1) the uncertainties caused by an inhomogeneous (u,v) coverage, 2) the typical errors in the measurements and 3) the spatial resolution achieved for each object. Results. From our sample of 23 sources we are able to find elongated parsec-scale MIR emission in five sources...

  9. Role of electric charge in shaping equilibrium configurations of fluid tori encircling black holes

    Czech Academy of Sciences Publication Activity Database

    Kovář, J.; Slaný, P.; Stuchlík, Z.; Karas, Vladimír; Cremaschini, C.; Miller, J. C.

    2011-01-01

    Roč. 84, č. 8 (2011), 084002/1-084002/14. ISSN 1550-7998 R&D Projects: GA MŠk(CZ) LC06014; GA ČR GA205/07/0052 Institutional research plan: CEZ:AV0Z10030501 Keywords : black holes Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.558, year: 2011

  10. Delayed outflows from black hole accretion tori following neutron star binary coalescence

    CERN Document Server

    Fernández, Rodrigo

    2013-01-01

    Expulsion of neutron-rich matter following the merger of neutron star (NS) binaries is crucial to the radioactively-powered electromagnetic counterparts of these events and to their relevance as sources of r-process nucleosynthesis. Numerical simulations of NS-NS coalescence find, however, a wide range in the quantity of prompt dynamically-ejected mass. Here we explore the long-term (viscous) evolution of remnant black hole accretion disks formed in such mergers by means of two-dimensional, time-dependent hydrodynamical simulations. The evolution of the electron fraction due to charged-current weak interactions is included, and neutrino self-irradiation is modeled as a lightbulb that accounts for the disk geometry and moderate optical depth effects. Over several viscous times (~1s), a fraction ~10% of the initial disk mass is ejected as a moderately neutron-rich wind (Y_e ~ 0.2) powered by viscous heating and nuclear recombination, with neutrino self-irradiation playing a sub-dominant role. Although the prope...

  11. Studies of spherical tori, stellarators and anisotropic pressure with the M3D code

    International Nuclear Information System (INIS)

    The Multi-level 3D (M3D) project simulates plasmas using multiple levels of physics, geometry and grid models in one code package. The M3D code has been extended to fundamentally non-axisymmetric and small aspect ratio, R/a > or ∼ 1, configurations. Applications include the non-linear stability of the NSTX spherical torus and of the spherical pinch, as well as the relaxation of stellarator equilibria. The fluid level physics model has been extended to evolve the anisotropic pressures pjparallel and pjperpendicular for the ion and electron species and has been applied to magnetic island evolution. (author)

  12. Mid-infrared interferometry of 23 AGN tori: On the significance of polar-elongated emission

    Science.gov (United States)

    López-Gonzaga, N.; Burtscher, L.; Tristram, K. R. W.; Meisenheimer, K.; Schartmann, M.

    2016-06-01

    Context. Detailed high-resolution studies of active galactic nuclei (AGN) with mid-infrared (MIR) interferometry have revealed parsec-sized dust emission that is elongated in the polar direction in four sources. Aims: Using a larger, coherently analyzed sample of AGN observed with MIR interferometry, we aim to identify elongated MIR emission in a statistical sample of sources. More specifically, we wish to determine if there is indeed a preferred direction of the elongation and whether this direction is consistent with a torus-like structure or with a polar emission. Methods: We investigated the significance of the detection of an elongated shape in the MIR emission by fitting elongated Gaussian models to the interferometric data at 12 μm. We paid special attention to (1) the uncertainties caused by an inhomogeneous (u,v) coverage; (2) the typical errors in the measurements; and (3) the spatial resolution achieved for each object. Results: From our sample of 23 sources, we are able to find elongated parsec-scale, MIR emission in five sources: three type 2s, one type 1i, and one type 1. Elongated emission in four of these sources has been published before; NGC 5506 is a new detection. The observed axis ratios are typically around 2 and the position angle of the 12 μm emission for all the elongated sources always seems to be closer to the polar axis of the system than to the equatorial axis. Two other objects, NGC 4507 and MCG-5-23-16, with reasonably well-mapped (u,v) coverage and good signal-to-noise ratios, appear to have a less elongated 12 μm emission. Conclusions: Our finding that sources showing elongated MIR emission are preferentially extended in polar direction sets strong constraints on torus models or implies that both the torus and NLR/outflow region have to be modeled together. In addition, models used for SED fitting will have to be revised to include emission from polar dust.

  13. (Re)presenting Equestrian "His"tories--Storytelling as a Method of Inquiry

    Science.gov (United States)

    Linghede, Eva; Larsson, Håkan; Redelius, Karin

    2016-01-01

    Responding to calls about the need to "give voice" to groups previously marginalized in research and to challenge meta-narratives about men in sports, this paper explores the use of a narrative approach to illuminate men's experiences--and the doing of gender--within equestrian sports, a sport dominated by women in Sweden. Adopting the…

  14. Analyzátory výfukových emisí vozidel

    OpenAIRE

    Přeučil, Martin

    2013-01-01

    The aim of this work is to describe the development and current knowledge in the design of the exhaust emissions of internal combustion analyzers motorů.Bakalářská work includes analysis of emissions from internal combustion engines, their composition and the description of the individual components. Besides, the description of the technical equipment for analysis of exhaust emissions of internal combustion engines and the principles on which these devices operate. The next chapter covers the...

  15. A Female Interrogative Reader: The Adolescent Jane Austen Reads and Rewrites (His)tory.

    Science.gov (United States)

    Reid-Walsh, Jacqueline

    1992-01-01

    Argues that Jane Austen's unpublished juvenile work "The History of England" has considerable relevance to twentieth-century high-school English classrooms. Notes that the work humorously shows the gender bias of traditional history texts because it is a "woman-centered" rewriting. (RS)

  16. Bifurcations of cycles and tori in one boundary value problem for the nonlocal equation of erosion

    International Nuclear Information System (INIS)

    A partial differential equation with deviating spatial variables has been considered. The case of small deviations has been studied. It has been shown that spatially inhomogeneous solutions can be sought as bifurcating solutions from homogeneous equilibrium states and that the wavelength of the corresponding solutions depends almost only on one parameter, the magnitude of deviation

  17. Quasi-localized wavefunctions on magnetized tori and tiny neutrino Yukawa couplings

    Science.gov (United States)

    Sumita, Keigo

    2016-01-01

    This paper shows that, a quasi-localization of wavefunctions in toroidal compactifications with magnetic fluxes can lead to a strong suppression for relevant Yukawa couplings, and it is applicable to obtain tiny neutrino masses. Although it is known that magnetic fluxes lead to a Gaussian profile of zero-modes on a torus and that can yield a suppressed coupling in higher-dimensional supersymmetric Yang-Mills (SYM) theories, the largest (diagonal) entry of Yukawa matrices is always of O(1) . In this paper, we propose a way to induce an absolutely tiny global factor of Yukawa matrices. In two SYM theories defined in different dimensional spacetime, their bifundamental representations must be localized as a point in some directions. Overlaps of such point-like localized wavefunctions and Gaussian zero-modes give a global factor of Yukawa matrices, and it can be a strong suppression factor or a usual O(1) factor, corresponding to their distance. Our numerical analysis shows that it is possible to obtain a suppression strong enough to realize the tiny neutrino masses without a fine-tuning. Furthermore, we propose a concrete model in a magnetized SYM system and demonstrate the mechanism to generate the tiny neutrino Yukawa couplings.

  18. Quasi-localized wavefunctions on magnetized tori and tiny neutrino Yukawa couplings

    CERN Document Server

    Sumita, Keigo

    2015-01-01

    This paper shows that, a quasi-localization of wavefunctions in toroidal compactifications with magnetic fluxes can lead to a strong suppression for relevant Yukawa couplings, and it is applicable to obtain tiny neutrino masses. Although it is known that magnetic fluxes lead to a Gaussian profile of zero-modes on a torus and that can yield a suppressed coupling in higher-dimensional supersymmetric Yang-Mills (SYM) theories, the largest (diagonal) entry of Yukawa matrices is always of $\\mathcal O(1)$. In this paper, we propose a way to induce an absolutely tiny global factor of Yukawa matrices. In two SYM theories defined in different dimensional spacetime, their bifundamental representations must be localized as a point in some directions. Overlaps of such point-like localized wavefunctions and Gaussian zero-modes give a global factor of Yukawa matrices, and it can be a strong suppression factor or a usual $\\mathcal O(1)$ factor, corresponding to their distance. Our numerical analysis shows that it is possibl...

  19. Effect of the toroidal magnetic field on the runaway instability of relativistic tori

    Czech Academy of Sciences Publication Activity Database

    Hamerský, Jaroslav; Karas, Vladimír

    2013-01-01

    Roč. 555, July (2013), A32/1-A32/8. ISSN 0004-6361 R&D Projects: GA ČR(CZ) GC13-00070J Institutional support: RVO:67985815 Keywords : accretion * accretion disks * black hole physics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 4.479, year: 2013

  20. Triggered oscillations and destruction of magnetized relativistic tori in 2D

    Czech Academy of Sciences Publication Activity Database

    Hamerský, Jaroslav; Karas, Vladimír

    Opava: Silesian University, 2014 - (Stuchlík, Z.), s. 107-114. (Publications of the Institute of Physics. 7). ISBN 9788075101266. ISSN 2336-5668. [RAGtime /14.-16./. Opava (CZ), 18.09.2012-22.09.2012] R&D Projects: GA ČR(CZ) GC13-00070J Institutional support: RVO:67985815 Keywords : accretion discs * black hole physics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

  1. Kinetic theory of equilibrium axisymmetric collisionless plasmas in off-equatorial tori around compact objects

    Czech Academy of Sciences Publication Activity Database

    Cremaschini, C.; Kovář, J.; Slaný, P.; Stuchlík, Z.; Karas, Vladimír

    2013-01-01

    Roč. 209, č. 15 (2013), s. 1-12. ISSN 0067-0049 R&D Projects: GA ČR(CZ) GC13-00070J Institutional support: RVO:67985815 Keywords : accretion * gravitation * black holes Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics Impact factor: 14.137, year: 2013

  2. Integrated-blanket-coil (IBC) concept applied to the OH-coil for spherical tori

    International Nuclear Information System (INIS)

    This concept combines blanket and coil functions into a single component. The objectives of the concept are to: (1) provide design options, (2) simplify overall configuration, (3) enhance compactness, and (4) reduce costs. Some drawings of the system are given

  3. An X-ray spectral model for clumpy tori in active galactic nuclei

    Energy Technology Data Exchange (ETDEWEB)

    Liu, Yuan; Li, Xiaobo, E-mail: liuyuan@ihep.ac.cn, E-mail: lixb@ihep.ac.cn [Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918-3, Beijing 100049 (China)

    2014-05-20

    We construct an X-ray spectral model for the clumpy torus in an active galactic nucleus (AGN) using Geant4, which includes the physical processes of the photoelectric effect, Compton scattering, Rayleigh scattering, γ conversion, fluorescence line, and Auger process. Since the electrons in the torus are expected to be bounded instead of free, the deviation of the scattering cross section from the Klein-Nishina cross section has also been included, which changes the X-ray spectra by up to 25% below 10 keV. We have investigated the effect of the clumpiness parameters on the reflection spectra and the strength of the fluorescent line Fe Kα. The volume filling factor of the clouds in the clumpy torus only slightly influences the reflection spectra, however, the total column density and the number of clouds along the line of sight significantly change the shapes and amplitudes of the reflection spectra. The effect of column density is similar to the case of a smooth torus, while a small number of clouds along the line of sight will smooth out the anisotropy of the reflection spectra and the fluorescent line Fe Kα. The smoothing effect is mild in the low column density case (N {sub H} = 10{sup 23} cm{sup –2}), whereas it is much more evident in the high column density case (N {sub H} = 10{sup 25} cm{sup –2}). Our model provides a quantitative tool for the spectral analysis of the clumpy torus. We suggest that the joint fits of the broad band spectral energy distributions of AGNs (from X-ray to infrared) should better constrain the structure of the torus.

  4. An X-ray spectral model for clumpy tori in active galactic nuclei

    CERN Document Server

    Liu, Yuan

    2014-01-01

    We construct an X-ray spectral model for the clumpy torus in an active galactic nucleus (AGN) using Geant4, which includes the physical processes of the photoelectric effect, Compton scattering, Rayleigh scattering, $\\gamma$ conversion, fluorescence line, and Auger process. Since the electrons in the torus are expected to be bounded instead of free, the deviation of the scattering cross section from the Klein-Nishina cross section has also been included, which changes the X-ray spectra by up to 25% below $10$ keV. We have investigated the effect of the clumpiness parameters on the reflection spectra and the strength of the fluorescent line Fe K$\\alpha$. The volume filling factor of the clouds in the clumpy torus only slightly influences the reflection spectra, however, the total column density and the number of clouds along the line of sight significantly change the shapes and amplitudes of the reflection spectra. The effect of column density is similar to the case of a smooth torus, while a small number of c...

  5. Indikátory změn půdní biodiverzity

    Czech Academy of Sciences Publication Activity Database

    Rusek, Josef

    první. Praha : Academia, 2005 - (Vačkář, D.), s. 249-261 ISBN 80-200-1386-5 Institutional research plan: CEZ:AV0Z60660521 Keywords : biodiversity of soil organisms * biodiversity monitoring in soils * monitoring network Subject RIV: EH - Ecology, Behaviour

  6. Daniel Adam z Veleslavína a jeho nomenklátory

    Czech Academy of Sciences Publication Activity Database

    Černá, Alena M.

    Praha: Karolinum, 2012 - (Čmejrková, S.; Hoffmannová, J.; Klímová, J.), s. 201-206 ISBN 978-80-246-2121-0. [Čeština v pohledu synchronním a diachronním. Praha (CZ), 01.06.2011-03.06.2011] R&D Projects: GA ČR GAP406/10/1140 Institutional research plan: CEZ:AV0Z90610518 Keywords : Humanistic Czech * Daniel Adam of Veleslavin * vocabulary Subject RIV: AI - Linguistics

  7. Semiclassical quantization via adiabatic switching. II. Choice of tori and initial conditions for multidimensional systems

    International Nuclear Information System (INIS)

    The formulation of a general strategy for implementing semiclassical quantization using the adiabatic-switching method, presented in the preceding paper for two-dimensional systems, is generalized to multidimensional systems. The method is shown to produce accurate semiclassical eigenvalues for the realistic polynomial potential describing SO2 as well as for model potentials for other multidimensional systems. The results are compared with semiclassical results obtained with use of other methods

  8. Semiclassical quantization via adiabatic switching. II. Choice of tori and initial conditions for multidimensional systems

    Energy Technology Data Exchange (ETDEWEB)

    Saini, S.; Zakrzewski, J.; Taylor, H.S.

    1988-10-15

    The formulation of a general strategy for implementing semiclassical quantization using the adiabatic-switching method, presented in the preceding paper for two-dimensional systems, is generalized to multidimensional systems. The method is shown to produce accurate semiclassical eigenvalues for the realistic polynomial potential describing SO/sub 2/ as well as for model potentials for other multidimensional systems. The results are compared with semiclassical results obtained with use of other methods.

  9. The Witten-Reshetikhin-Turaev invariants of finite order mapping tori I

    DEFF Research Database (Denmark)

    Ellegaard Andersen, Jørgen

    polynomial in the level $k$, weighted by a complex phase, which is $k$ times the Chern-Simons invariant corresponding to the component. We express the coefficients of these polynomials in terms of cohomological pairings on the fixed point set of the moduli space of flat connections on the surface. We...... explicitly describe the fixed point set in terms of moduli spaces of the quotient orbifold Riemann surface and for the smooth components we express the aforementioned coefficients in terms of the known generators of the cohomology ring. We provide an explicit formula in terms of the Seifert invariants of the...

  10. String theory flux vacua on twisted tori and generalized complex geometry

    International Nuclear Information System (INIS)

    This thesis is devoted to the study of flux vacua of string theory, with the ten-dimensional space-time split into a four-dimensional maximally symmetric space-time, and a six-dimensional internal manifold M, taken to be a solv-manifold (twisted torus). Such vacua are of particular interest when trying to relate string theory to supersymmetric (SUSY) extensions of the standard model of particles, or to cosmological models. For SUSY solutions of type II supergravities, allowing for fluxes on M helps to solve the moduli problem. Then, a broader class of manifolds than just the Calabi-Yau can be considered for M, and a general characterization is given in terms of Generalized Complex Geometry: M has to be a Generalized Calabi-Yau (GCY). A subclass of solv-manifolds have been proven to be GCY, so we look for solutions with such M. To do so, we use an algorithmic resolution method. Then we focus on specific new solutions: those admitting an intermediate SU(2) structure. A transformation named the twist is then discussed. It relates solutions on torus to solutions on solv-manifolds. Working out constraints on the twist to generate solutions, we can relate known solutions, and find a new one. We also use the twist to relate flux vacua of heterotic string. Finally we consider ten-dimensional de Sitter solutions. Looking for such solutions is difficult, because of several problems among which the breaking of SUSY. We propose an Ansatz for SUSY breaking sources which helps to overcome these difficulties. We give an explicit solution on a solv-manifold, and discuss partially its four-dimensional stability. (author)

  11. Nonequilibrium phase transitions and bifurcations of limit cycles and tori- a new research topic for statistical mechanics mechanics

    International Nuclear Information System (INIS)

    In the development of statistical mechanics we can more or less distinguish between two steps. First of all the main objective of statistical mechanics had been to give thermodynamics a solid theoretical basis starting from the microscopic world. The next step has then been performed in parallel with the development of irreversible thermodynamics dealing with processes close to thermal equilibrium. The problems dealt with here are mainly transport and relaxation processes. Over the past years it has become apparent that there is a third field, namely processes far away from thermal equilibrium. The particular interest in those processes stems from the fact that in such situations order can be generated on a macroscopic scale. The ordered states can be maintained by a flux of energy or matter through, these systems. In the realm of synergetjcs we have studied numerous examples and we now know that the occurrence of many of the ordered structures is governed by the same basic principles. (author)

  12. Quiver matrix mechanics for IIB string theory II: generic dual tori, fractional matrix membrane and SL(2,Z) duality

    Science.gov (United States)

    Dai, Jian; Wu, Yong-Shi

    2005-02-01

    With the deconstruction technique, the geometric information of a torus can be encoded in a sequence of orbifolds. By studying the matrix theory on these orbifolds as quiver mechanics, we present a formulation that (de)constructs the torus of generic shape on which matrix theory is "compactified". The continuum limit of the quiver mechanics gives rise to a (1 + 2)-dimensional SYM. A hidden (fourth) dimension, that was introduced before in the matrix theory literature to argue for the electric-magnetic duality, can be easily identified in our formalism. We construct membrane wrapping states rigorously in terms of Dunford calculus in the context of matrix regularization. Unwanted degeneracy in the spectrum of the wrapping states is eliminated by using SL(2,Z) symmetry and the relations to the FD-string bound states. The dual IIB circle emerges in the continuum limit, constituting a critical evidence for IIB/M duality.

  13. Vybrané fyzikální parametry jako indikátory kvality půdy

    OpenAIRE

    KRATOCHVÍLOVÁ, Lucie

    2014-01-01

    In bachelor thesis "Selected physical parameters as indicators of soil quality" we aimed at soil physical properties in Luvi-HaplicChernozem (locality Praha-Ruzyně) and Haplic Cambisol (localities Vatín and Svárov). We followed texture, density, bulk density, porosity, micro and macro aggregates composition, and stability of aggregates. Also content and quality of soil humic substances was determined. Obtained results showed that there is a linear correlation between clay particles content an...

  14. Star formation black hole growth and dusty tori in the most luminous AGNs at z=2-3.5

    CERN Document Server

    Netzer, Hagai; Nordon, Raanan; Trakhtenbrot, Benny; Lira, Paulina; Shemmer, Ohad

    2015-01-01

    We report herschel observations of 100 very luminous, optically selected AGNs at z=2-3.5 with log(LUV)(erg/sec)> 46.5, where LUV=L1350A. The distribution in LUV is similar to the general distribution of SDSS AGNs in this redshift and luminosity interval. We measured SF luminosity, LSF, and SFR in 34 detected sources by fitting combined SF and WISE-based torus templates. We also obtained statistically significant stacks for the undetected sources in two luminosity groups. The sample properties are compared with those of very luminous AGNs at z>4.5. The main findings are: 1) The mean and the median SFRs of the detected sources are 1176 and 1010 Msun/yr, respectively. The mean SFR of the undetected sources is 148 Msun/yr. The ratio of SFR to BH accretion rate is approximately 80 for the detected sources and less than 10 for the undetected sources. There is no difference in LAGN and only a very small difference in L(torus) between detected and undetected sources. 2) The redshift distribution of LSF and LAGN for t...

  15. A relation between the right triangle and circular tori with constant mean curvature in the unit 3-sphere

    Directory of Open Access Journals (Sweden)

    Abdênago Barros

    2004-12-01

    Full Text Available In this note we will show that the inverse image under the stereographic projection of a circular torus of revolution in the 3-dimensional euclidean space has constant mean curvature in the unit 3-sphere if and only if their radii are the catet and the hypotenuse of an appropriate right triangle.Neste artigo mostraremos que a imagem inversa pela projeção estereográfica de um toro circular de revolução no espaço euclidiano de dimensão 3 tem curvatura média constante se e somente se os seus raios são o cateto e a hipotenusa de um triângulo retângulo apropriado.

  16. C$*$-extensions of tori, higher Chow groups and applications to incidence equivalence relations for algebraic cycles

    CERN Document Server

    Müller-Stach, S J

    1995-01-01

    Let X be a smooth projective variety of dimension n. We repeat Bloch4s construction of a biextension {\\bf E} over the Chow groups of homologically trivial cycles of codimensions p and n+1-p. In characteristic zero we prove that {\\bf E} is the pullback of the Poincare biextension over the corresponding product of intermediate Jacobians. Using this we study various equivalence relations for algebraic cycles and finally give a new proof of a result of Murre, which states that Griffiths4 conjecture holds for codimension two cycles.

  17. Effects of magnetic field on the runaway instability of relativistic accretion tori near a rotating black hole

    Czech Academy of Sciences Publication Activity Database

    Karas, Vladimír; Hamerský, Jaroslav

    Cambridge: Cambridge University Press, 2014 - (Sjouwerman, L.), s. 424-426. (IAU Symposium Proceedings Series. 303). ISBN 9781107044616. ISSN 1743-9213. [Symposium of the International Astronomical Union /303./. Santa Fe (US), 30.09.2013-04.10.2013] Grant ostatní: UK(CZ) SVV-26089 Institutional support: RVO:67985815 Keywords : accretion discs * gravitation * black hole physics Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

  18. Binomul distanţă - timp în transportul feroviar de călători

    Directory of Open Access Journals (Sweden)

    Liviu Gabriel Ghiţuleasa

    2012-12-01

    Full Text Available Railways confronted substantial challenges through last years and made major progress in addressing them. Also, the European Commission identified some concrete priorities between 2011 and 2012, priorities that boost growth, including increasing investment in transport and infrastructures. Therefore, European Union transport policies aim at fostering a clean, safe and efficient travel throughout Europe, underpinning the right of citizens to travel freely throughout the EU. With arguments about access, competitivity, responsability, sustainability and security partly unresolved, this article presents that the concepts has been around for some time and has gradually been applied to existing railway transportation. We must see those rail services and infrastructure that there sits empty, slowly deteriorating in some EU member states, because railways brings us great benefits, but also great responsabilities.

  19. Analysis of the requirements for economic magnetic fusion

    International Nuclear Information System (INIS)

    A generic reactor model is used to examine the economic viability of electricity generation by magnetic fusion. The simple model uses components which are representative of those used in previous reactor studies of deuterium-tritium burning tokamaks, stellarators, bumpy tori, reverse field pinches and tandem mirrors. Conservative costing assumptions are made. The generic reactor is not a tokamak but rather it is intended to emphasize what is common to all magnetic fusion reactors. The reactor uses a superconducting toroidal coil set to produce the dominant magnetic field. To this extent it is a less good approximation to systems, such as the reversed field pinch in which the main field is produced by a plasma current. The main output of the study is the cost of electricity as a function of the weight and size of the fusion core - blanket, shield, structure and coils. The model shows that a 1200 MW/sub e/ power plant with a fusion core weight of about 10,000 tonnes should be competitive in the future with fission and fossil plants. Sensitivity studies of varying the assumptions show that this result is not sensitively dependent on any given assumption. Of particular importance is the result that this scale of fusion reactor may be realized with only moderate advances in physics and technology capabilities. For a fusion-fission hybrid with a high support ratio for fission reactors, the fusion island is not such a critical driver as for electricity production. 19 refs., 5 figs., 3 tabs

  20. Cost assessment of a generic magnetic fusion reactor

    International Nuclear Information System (INIS)

    A generic reactor model is used to examine the economic viability of generating electricity by magnetic fusion. The simple model uses components that are representative of those used in previous reactor studies of deuterium-tritium-burning tokamaks, stellarators, bumpy tori, reversed-field pinches (RFPs), and tandem mirrors. Conservative costing assumptions are made. The generic reactor is not a tokamak; rather, it is intended to emphasize what is common to all magnetic fusion rectors. The reactor uses a superconducting toroidal coil set to produce the dominant magnetic field. To this extent, it is not as good an approximation to systems such as the RFP in which the main field is produced by a plasma current. The main output of the study is the cost of electricity as a function of the weight and size of the fusion core - blanket, shield, structure, and coils. The model shows that a 1200-MW(e) power plant with a fusion core weight of about 10,000 tonnes should be competitive in the future with fission and fossil plants. Studies of the sensitivity of the model to variations in the assumptions show that this result is not sensitively dependent on any given assumption. Of particular importance is the result that a fusion reactor of this scale may be realized with only moderate advances in physics and technology capabilities

  1. DESIGN AND CONSTRUCTION DETAILS OF THE 7,4 TESLA SUPERCONDUCTING METASTABLE MAGNET FOR THE ELMO BUMPY TORUS PROOF-OF-PRINCIPLE PROGRAM

    OpenAIRE

    Ackerman, S; Kimmy, E.; Lieurance, D.; Mann, T.

    1984-01-01

    The critical nature of a superconducting magnet, operating in a metastable cooling mode at 7.4 T and at an overall winding current density of about 10,000 A/cm2 demands rigorous design treatment, controlled, high-quality parts construction, and superior wortananship. Details surrounding the design and testing of conductor splices, conductor and bobbin insulation, voltage taps for quench detection, cold mass supports, and dewar design will be discussed as they relate to fabrication and assembl...

  2. Automatický systém podporující operátory složitých procesů

    Czech Academy of Sciences Publication Activity Database

    Kárný, Miroslav; Nedoma, Petr; Guy, Tatiana Valentine; Knížek, Jiří; Nagy, Ivan

    2003-01-01

    Roč. 46, č. 3 (2003), s. 177-179. ISSN 0005-125X R&D Projects: GA ČR GA102/03/0049; GA AV ČR IBS1075102 Institutional research plan: CEZ:AV0Z1075907 Keywords : management of complex processes * operator support * probabilistic clustering Subject RIV: BC - Control System s Theory http://library.utia.cas.cz/prace/20030045.doc

  3. X-ray Spectral Model of Reprocessing by Smooth and Clumpy Molecular Tori in Active Galactic Nuclei with the MONACO framework

    CERN Document Server

    Furui, Shun'ya; Odaka, Hirokazu; Kawaguchi, Toshihiro; Ohno, Masanori; Hayashi, Kazuma

    2016-01-01

    We construct an X-ray spectral model of reprocessing by a torus in an active galactic nucleus (AGN) with a Monte Carlo simulation framework MONACO. Two torus geometries of smooth and clumpy cases are considered and compared. In order to reproduce a Compton shoulder accurately, MONACO includes not only free electron scattering but also bound electron scattering. Raman and Reyleigh scattering are also treated, and scattering cross sections dependent on chemical states of hydrogen and helium are included. Doppler broadening by turbulence velocity can be implemented. Our model gives consistent results with other available models, such as MYTorus, except for differences due to different physical parameters and assumptions. We studied the dependence on torus parameters for Compton shoulder, and found that a intensity ratio of Compton shoulder to line core mainly depends on the column density, inclination angle, and metal abundance. For instance, an increase of metal abundance makes the Compton shoulder relatively w...

  4. PI regulátory s vyváženými akčními zásahy

    Czech Academy of Sciences Publication Activity Database

    Klán, Petr; Gorez, R.

    2002-01-01

    Roč. 45, č. 2 (2002), s. 90-97. ISSN 0005-125X Institutional research plan: AV0Z1030915 Keywords : PI control * control ler design * integral criteria * tuning relations Subject RIV: BD - Theory of Information

  5. Imobilizované fotosenzitizátory singletového kyslíku a jejich účinek na mikroorganismy

    Czech Academy of Sciences Publication Activity Database

    Rychtáriková, Renata; Kuncová, Gabriela

    2009-01-01

    Roč. 103, č. 10 (2009), s. 800-813. ISSN 0009-2770 R&D Projects: GA ČR(CZ) GA203/06/1244 Institutional research plan: CEZ:AV0Z40720504 Keywords : photosensitizer * singlet oxygen * reactive oxygen species Subject RIV: CE - Biochemistry Impact factor: 0.717, year: 2009

  6. Vizuální kultura a interkulturní střetávání. Gottfried Lindauer mezi Maory a kolonizátory

    Czech Academy of Sciences Publication Activity Database

    Kreuzzieger, Milan

    Řevnice: Arbor vitae, 2015 - (Filip, R.; Musil, R.), s. 110-129 ISBN 978-80-7467-081-7 Institutional support: RVO:67985955 Keywords : visual culture * intercultural encounters * colonization * Maori * painting Subject RIV: AA - Philosophy ; Religion

  7. Indikátory pro strategie environmentálního vzdělávání

    Directory of Open Access Journals (Sweden)

    Jana Dlouhá

    2007-12-01

    Full Text Available Základní principy environmentálního vzdělávání – nové kvality, které tento typ vzdělávání má přinášet – se promítají i do oblasti posuzování způsobu a míry dosažení cílů takto vymezených. Soubory indikátorů, které jsou v současné době projednávány, jsou zaměřeny na proces získávání znalostí, vytváření žádoucích změn v hodnotovém systému a chování; hodnocení s využitím těchto indikátorů má být v souladu s dynamickou povahou hodnocených jevů. To platí i pro oblast evaluace vzdělávací politiky, jež je realizované pomocí tzv. rámcových indikátorů. Zásady tvorby jsou v následujícím textu doloženy příklady z mezinárodní praxe, přičemž jsou kriticky popsány přednosti i potenciální rizika metod a postupů v současnosti používaných.

  8. Subjektivní indikátory blahobytu: přístupy, měření a data

    Czech Academy of Sciences Publication Activity Database

    Večerník, Jiří

    2012-01-01

    Roč. 60, č. 3 (2012), s. 291-308. ISSN 0032-3233 R&D Projects: GA ČR(CZ) GAP404/11/1521 Institutional support: RVO:68378025 Keywords : subjective well-being * happiness * life satisfaction Subject RIV: AO - Sociology, Demography Impact factor: 0.722, year: 2012

  9. Postojové konektory/operátory: kontrastivní analýza vybraného vzorku textů

    OpenAIRE

    BROŽOVÁ, Kristýna

    2016-01-01

    The aim of this Master´s thesis is the contrastive analysis of discourse markers on a selected type of texts in Spanish and Czech language. The thesis is divided in two parts theoretical and practical part. Firstly, in the theoretical part of the thesis, is introduced the textual linguistic the field which studies discourse markers. For wholeness, are briefly mentioned all of the seven standards of textuality with profound focus on textual coherence. Other part of the thesis aims on terminolo...

  10. Voda jako bezpečné refugium před predátory u hnízdících kachen

    Czech Academy of Sciences Publication Activity Database

    Benešová, O.; Kreisinger, J.; Javůrková, V.; Albrecht, Tomáš

    Brno: Ústav biologie obratlovců AV ČR, 2008 - (Bryja, J.; Nedvěd, O.; Sedláček, F.; Zukal, J.). s. 26 ISBN 978-80-87189-00-9. [Zoologické dny. 14.02.2008-15.02.2008, České Budějovice] Institutional research plan: CEZ:AV0Z60930519 Keywords : Nest predation * mortality * antipredation behaviour Subject RIV: EG - Zoology

  11. The News International phone-hacking saga threatens to retoxify the Tory brand. Cameron needs to be ruthless to save his reputation

    OpenAIRE

    Leunig, Tim

    2011-01-01

    David Cameron’s closeness to the News International elite and his hiring of Andy Coulson have posed real and serious problems for the PM as the phone-hacking story continues to unfold. Tim Leunig argues that Cameron needs match Rupert Murdoch’s ruthlessness in taking on the media giant and preventing the scandal from retoxifying the Conservative Party.

  12. High-order schemes for non-ideal $3+1$ GRMHD: a study of the kinematic dynamo process in accretion tori

    CERN Document Server

    Del Zanna, L; Bucciantini, N

    2014-01-01

    We present the first astrophysical application of the ECHO code in its recent version supplemented by a generalized Ohm law, namely a kinematic study of dynamo effects in thick accretion disks. High-order \\emph{implicit-explicit} Runge-Kutta time-stepping routines are implemented and validated within $3+1$ \\emph{General Relativistic MagnetoHydroDynamics} (GRMHD). The scheme is applied to a differentially rotating torus orbiting a Kerr black hole, where the mean-field dynamo process leads to strong amplification of seed magnetic fields. We show that the interplay between the toroidal and poloidal components occurs qualitatively in the same fashion as in the Sun, butterfly diagrams are reproduced, and a typical time-scale for the field evolution is found, depending on the dynamo and resistivity numbers, which could explain periodicities as observed in several accreting systems.

  13. Indikátory rizikového chování v kontextu užívání konopných drog

    Czech Academy of Sciences Publication Activity Database

    Miovský, Michal; Šťastná, L.; Řehan, V.

    2004-01-01

    Roč. 8, č. 3 (2004), s. 200-205. ISSN 1211-7579 R&D Projects: GA ČR GA406/02/1449 Institutional research plan: CEZ:AV0Z7025918 Keywords : Cannabis * epidemiological indicators * drug use Subject RIV: AN - Psychology

  14. Indikátory obav z kriminality v českých sociálněvědních výzkumech

    Czech Academy of Sciences Publication Activity Database

    Moravcová, Eva

    2014-01-01

    Roč. 8, č. 2 (2014), s. 121-141. ISSN 1802-8152 R&D Projects: GA MŠk LM2010012 Institutional support: RVO:68378025 Keywords : fear of crime * feeling of safety * social research Subject RIV: AG - Legal Sciences http://dav.soc.cas.cz/issue/21-data-a-vyzkum-2-2014/126

  15. Cenová politika na Internetu se zaměřením na cenové agregátory

    OpenAIRE

    Pešek, Tomáš

    2011-01-01

    The thesis deals with the impact of Internet features on the behavior of both consumers and online retailers aspiring to apply eligible online pricing and business strategies. Price is considered to be one of the most significant marketing policy factors, the importance of which is in highly competitive online market environment, compared to usual brick and mortar stores, noticeably amended. Online price comparison service delivered to public by so called shopbots/pricebots forced the e-shopp...

  16. Phono-somatics: gender, embodiment and voice in the recorded music of Tori Amos, Björk and PJ Harvey

    OpenAIRE

    Boak, Sarah

    2015-01-01

    This thesis is a feminist enquiry into the relationship between gender, embodiment and voice in recorded popular music post-1990. In particular, the study focuses on the term ‘embodiment’ and defines this term in a way that moves forward from a simple understanding of representing the body in music. The expression of embodied subjectivity through the voice is crucial to this interpretation, and therefore is the central concern of this thesis. I describe this relationship between embodiment an...

  17. Ana's Story: How She and Her Family Learned about Sports Injuries

    Science.gov (United States)

    ... tory How she and her family learned about sports injuries. This booklet is not copyrighted. You can make ... tory How she and her family learned about sports injuries. Juan Néstor Elena Isabel Carlos 1 2 3 ...

  18. Kuula / Erik Morna

    Index Scriptorium Estoniae

    Morna, Erik, 1969-

    2004-01-01

    Heliplaatidest: Tori Amos "Tales Of A Librarian: A Tori Amos Collection", Madonna "Remixed & Revisited", No Doubt "The Singles 1992-2003", Basement Jaxx "Kish Kash", Erykah Badu "Worldwide Underground"

  19. Torus bifurcations in multilevel converter systems

    DEFF Research Database (Denmark)

    Zhusubaliyev, Zhanybai T.; Mosekilde, Erik; Yanochkina, Olga O.

    2011-01-01

    embedded one into the other and with their basins of attraction delineated by intervening repelling tori. The paper illustrates the coexistence of three stable tori with different resonance behaviors and shows how reconstruction of these tori takes place across the borders of different dynamical regimes....... The paper also demonstrates how pairs of attracting and repelling tori emerge through border-collision torus-birth and border-collision torus-fold bifurcations. © 2011 World Scientific Publishing Company....

  20. Kláštory klarisiek v Uhorsku – alternatíva spoločenského uplatnenia šľachtických žien v ranom novoveku

    OpenAIRE

    Kušniráková, Ingrid

    2010-01-01

    The cloisters of the Poor Clares were an alternative to matrimonial life for girls from the higher social strata. Many of them lived in the cloister from early childhood and became nuns mainly at the behest of their parents. The cloistral life restricted them from making social and family contacts; on the other hand it offered some of them the opportunity for self-realization. Abbesses had the possibility to govern the community of women, to manage large properties, and command employees and ...

  1. Optimalizace výrobního procesu s tříosými manipulátory Güdel na lince tepelného zpracování

    OpenAIRE

    Zich, Jozef

    2013-01-01

    Diplomová práca vznikla na žiadosť firmy ICE industrial services zabezpečujúcej firme Alcan Strojmetal Aluminium Forging, s.r.o., správu a vývoj software pre PLC. Cieľom práce bolo analyzovať softvare riadenia linky tepelného spracovania hliníkových výkovkov. Následne navrhnúť a realizovať úpravy v software riadenia. Tieto funkcie overiť. A nakoniec pripísať možnosti ovládania do návodu pre obsluhu linky.

  2. Manažerské simulátory pro podporu strategického rozhodování v malých a středních firmách

    OpenAIRE

    Beer, Daniela

    2005-01-01

    Small companies can more flexible react to the present economic crise on one side, but on the other side they are very influenced by unpredictability and continous external factor changes From that reason the current economic crise can contribute to the development of various managerial simulation enabling better support in the company decision making. This new condition and rules "rebuilding" without question means also the creation of new opportunity. The decision making should be supported...

  3. Kompozitní elektrodové materiály pro lithium-iontové akumulátory na bázi LiFePO4

    OpenAIRE

    Vilhelm, Ondřej

    2011-01-01

    Předložená práce se zabývá studiem problematiky sekundárních Li-ion článků a různých dostupných katodových materiálů. Připravili jsme vzorky LiFePO4 s přidáním různých druhů uhlíkových materiálů jako je Super P, vulcan a expandovaný grafit. Vytvořili jsme vždy vzorek s a bez použití surfaktantu. Vytvořené vzorky jsme porovnali měřícími elektrochemickými metodami (cyklická voltametrie, nabíjecí vybíjecí cykly a impedanční spektroskopie). Dále jsme namodelovali tříbodovou elektrochemickou celu ...

  4. Vliv anion-selektivního polymerního pojiva na vlastnosti anody obsahující neplationové katalyzátory při alkalické elektrolýze vody

    Czech Academy of Sciences Publication Activity Database

    Bouzek, K.; Hnát, J.; Paidar, M.; Jiroušová, J.; Schauer, Jan; Žitka, Jan

    2011-01-01

    Roč. 7, č. 13 (2011), s. 131-132. ISSN 1336-7242. [Zjazd chemikov /63./. 05.09.2011-09.09.2011, Tatranské Matliare] Institutional research plan: CEZ:AV0Z40500505 Keywords : hydrogen * water electrolysis Subject RIV: CD - Macromolecular Chemistry

  5. Nástroje sponzoringu a jejich efektivní využití se zaměřením na mobilní operátory

    OpenAIRE

    Vychytilová, Markéta

    2007-01-01

    Práce se zabývá poměrně mladým nástrojem marketingové komunikace - sponzoringem. V teoretické části je nejprve podrobně popsán samotný sponzoring a jeho právní úprava. Následně jsou vymezeny jednotlivé typy sponzoringu včetně jejich výhod a nevýhod použití. Z různých druhů sponzoringu práce vymezuje mediální sponzoring; sportovní / sociální sponzoring, ambush marketing, branded entertainment, filmový sponzoring a celebrity ve sponzoringu. V závěru teoretické části je přiblíženo a nastíněno po...

  6. Co nám prozradily geolokátory o zimovištích rákosníků obecných a velkých?

    Czech Academy of Sciences Publication Activity Database

    Hánová, A.; Koleček, Jaroslav; Hahn, S.; Ilieva, M.; Honza, Marcel; Procházka, Petr

    Brno : Ústav biologie obratlovců AV ČR, 2014 - (Bryja, J.; Drozd, P.). s. 67 ISBN 978-80-87189-16-0. [Zoologické dny. 06.02.2014-07.02.2014, Ostrava] Institutional support: RVO:68081766 Keywords : Acrocephalus Subject RIV: EG - Zoology

  7. Přístupy k zajištění kvality zdravotní péče: manažerské simulátory pro podporu rozhodování

    OpenAIRE

    Lešetický, Ondřej

    2009-01-01

    Assuring the quality of healthcare is a very complex subject combining a variety of approaches (structural, process, result, etc.) on the macro-level of the health system as part of national health policy and even on micro-level in healthcare facilities. However, majority of models for monitoring the quality of health care is still based on a pragmatic approach to structural quality monitoring, with the primary aim to improve the health status of the population through affordable and quality ...

  8. Dřevokazné houby jako bioindikátory znečištění životního prostředí těžkými kovy

    Czech Academy of Sciences Publication Activity Database

    Gabriel, Jiří; Baldrian, Petr; Rychlovský, P.; Čurdová, E.

    Košice, 2001. s. 159. [Congress of the Czechoslovak Society for Microbiology /22./ with international participation on the topic of health and microorganisms. 05.09.2001-09.09.2001, Košice] R&D Projects: GA ČR GA204/99/1528 Keywords : health * microorganisms * congress Subject RIV: EE - Microbiology, Virology

  9. David Willetts’ blaming of feminism for male working class unemployment reveals the inner workings of the Tory mind: a hatred of the agency of women and the suspicion of progressive movements

    OpenAIRE

    Evans, Mary

    2011-01-01

    Last Friday, the universities Minister David Willetts commented that women’s progress in the workplace has prevented working class men from attaining well-paid jobs, saying that “Feminism trumped egalitarianism”. Mary Evans critically unpacks these comments and says that not only are they ignorant and prejudiced, but they also show the deep suspicion of Conservatives to progressive movements.

  10. Srovnání biodiverzity v hospodářském lese a v přirozeném horském lese - indikátory biodiverzity

    OpenAIRE

    BARBORKOVÁ, Jana

    2012-01-01

    Bachelor thesis deal with biodiversity in managed forests and in natural mountain forests. In the literature review discussions causes of the decrease of biodiversity in forests affected by anthropogenic activities. Further points to the importance of dead wood in a natural forest ecosystem. There is discussed effect of clear-cut mining on the microclimate of the certain habitat and biodiversity (significant microbiotops invertebrates). As bioindicators of anthropogenic impact on the forest a...

  11. Electron microscopic observations of hydrogen implantation in ilmenites

    Science.gov (United States)

    Blanford, G. E.

    1983-01-01

    Hydrogen ion beams were found to form submicrometer, bumpy textures on the surface of ilmenite grains. From this effect, it is believed that similar bumpy textures seen on lunar ilmenite, pyroxene, and olivine grains are likely to be caused by solar wind irradiation. As a consequence, the concentration of bumpy textured grains may be a useful index of surface maturity for lunar soils. An attempt was made to search for grains with these bumpy textures in interplanetary dust and lunar and meteoritic regolith breccias in order to obtain information about the duration of their exposure to the solar wind. Solar wind irradiation was simulated on natural, terrestrial ilmenite. Hydrogen ion beams were directed at small grains and polished sections which were then examined by electron microscopy.

  12. What Is Anal Cancer?

    Science.gov (United States)

    ... anal tumors Polyps: Polyps are small, bumpy, or mushroom-like growths that develop in the mucosa or ... affects skin of the perianal area, vulva, or breast. This condition should not be confused with Paget’s ...

  13. Cauliflower Ear

    Science.gov (United States)

    ... Snowboarding, Skating Crushes What's a Booger? What's Cauliflower Ear? KidsHealth > For Kids > What's Cauliflower Ear? Print A A A Text Size Have you ever seen someone whose ear looks bumpy and lumpy? The person might have ...

  14. Torus palatinus

    Directory of Open Access Journals (Sweden)

    Pumersha Naidoo

    2013-11-01

    Full Text Available Kupffer and Bessel-Hagen coined the term torus palatinus in 1879 for a benign osseous protuberance arising from the midline of the hard palate. Tori are present in approximately 20% of the population and are occult until adulthood. Recent advances in modern radiology have led to improved evaluation and diagnosis of tori.

  15. Morphological and clinical characteristics of the torus palatinus and torus mandibularis in a sample of young and adults' Romanian people.

    Science.gov (United States)

    Scrieciu, Monica; MercuŢ, Veronica; MercuŢ, Răzvan; Bîrjovanu, Carrol; Stan, Mihaela Cristina; Marinescu, Iulia Roxana; Niculescu, Mihaela; Iorgulescu, Daniel; Bătăiosu, Marilena

    2016-01-01

    The oral exostoses are protuberance located on the alveolar surfaces of the jawbones with nodular, flat or pedunculated shape. The purpose of this study was to highlight the variability of the morphological and clinical characteristics of torus palatinus (TP) and torus mandibularis (TM) in a sample of young and adults' Romanian people. The study was conducted on 74 participants examined in Dental Prosthetics Clinic of the Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, Romania, during October-December 2014. The morphological characteristics of the tori were non-metrical evaluated by the standard procedures of the clinical examination. Descriptive statistics only including means, averages and percentage incidence have been used to describe the results. Of the 74 study participants, 31 (41.89%) were males and 43 (55.40%) were females. Six had only TP, seven had only TM and three participants had both TP and TM. The most of the palatal tori had spindle shaped, located in all area of the hard palate The round mandibular tori with big size were located in the area of both premolars, and those with elongate shape were located in the canine-premolars area. The palatal tori were more frequently in women and the frequency of mandibular tori was equally in men and women. Most of the palatal tori had spindle shape and most of the mandibular tori were solitary bilateral. PMID:27151699

  16. Vliv přípravků s růstovými stimulátory (fytohormony) na růst, vývoj a zdravotní stav smrku ztepilého a buku lesního ve 3. LVS na LHC Ketkovice

    OpenAIRE

    Adámek, Pavel

    2014-01-01

    The aim of this bachelor thesis was evaluate the effect of the preparation with phytohormones on development of Norway spruce and European beech in the 3rd forest vegetation tier. The research was conducted at the LHC Ketkovice, natural forest area 33 - Předhoří Českomoravské vrchoviny. There were established five research areas in cultures with problematic growth. Especially, has been researched the effects of granulated fertilizers Silvamix and organo-mineral stimulat Vermaktiv Stimul. Effe...

  17. Řídící elektronika pro efektivní napájení zařízení s Li-Ion akumulátory pomocí solárních článků

    OpenAIRE

    Horký, Luděk

    2008-01-01

    Bakalářská práce je zaměřena na problematiku získávání a uchování elektrické energie ze slunečního záření. Cílem této práce je vytvořit efektivní nabíjecí systém Lithium-Iontové baterie pomocí solárních článků. K tomuto účelu byly vybrány ke zkoumání čtyři různé dostupné solární panely, které byly naměřeny a vyhodnoceny. Z těchto panelů byl vybrán ten nejoptimálnější, k němuž bylo cílem vytvořit řídící elektroniku pro efektivní nabíjení Li-Ion akumulátoru, vyřešit všechny problémy spojené s t...

  18. Hlístice jako indikátory obnovy luk na intenzivně obhospodařované orné půdě. Projekt KONTAKT č. 2004-13, Česko - rakouská spolupráce

    Czech Academy of Sciences Publication Activity Database

    Háněl, Ladislav

    2006-01-01

    Roč. 14, č. 3 (2006), III-IV. ISSN 1210-4612 Institutional research plan: CEZ:AV0Z60660521 Keywords : nematodes * indicators of meadow restoration * intensively managed arable soil Subject RIV: EH - Ecology, Behaviour

  19. 止痒洗剂联合妇炎消生物敷料栓治疗妊娠合并外阴阴道假丝酵母菌病的临床观察%Clinical observation on the effect of anti -itching lotion combined with Fuyanxiao biological dressing supposi-tory in treatment of pregnancy and vulvovaginal candidiasis

    Institute of Scientific and Technical Information of China (English)

    康玉惠

    2015-01-01

    目的:观察止痒洗剂联合妇炎消生物敷料栓治疗妊娠合并外阴阴道假丝酵母菌病(VVC)的临床疗效及复发率。方法选择妊娠合并 VVC 患者236例,将患者以随机数字表法分为两组:治疗组、对照组,各118例。治疗组采用止痒洗剂联合妇炎消生物敷料栓治疗,对照组单独采用妇炎消生物敷料栓治疗,疗程结束后比较两组的临床疗效及复发率。结果治疗组治愈率90.68%,高于对照组的57.62(χ2=10.731,P <0.01);治疗组复发率3.39%,低于对照组的13.56%,差异有统计学意义(χ2=10.733,P <0.05)。结论止痒洗剂联合妇炎消生物敷料栓治疗妊娠合并 VVC 可有效改善患者的临床症状,降低复发率。%Objective To observe the effect of antipruritic lotion combined Fuyanxiao with biological dress-ing suppository in the treatment of vulvovaginal candidiasis in pregnancy(VVC)the clinical curative effect and the recurrence rate.Methods 236 patients with pregnancy complicated with VVC,would be in community were randomly divided into the two groups:combination treatment group,single drug group,118 cases in each.Combination therapy using antipruritic lotion combined Fuyanxiao biological dressing suppository combined treatment,the control group was treated by Fuyanxiao biological dressing suppository treatment,two groups of clinical efficacy and recurrence rate after the end of treatment were compared.Results The cure rate in the combined treatment group was 90.68%,which was higher than 57.62 % in the control group(χ2 =10.731,P <0.01);The recurrence rate in the combined treatment group was 3.39%,which was lower than 13.56% in the control group(χ2 =10.733,P <0.05).Conclusion The antipruritic lotion combined Fuyanxiao biological dressing suppository in the treatment of pregnancy with VVC can effectively improve the clinical symptoms of patients,reduce the recurrence rate.

  20. Interference při měření N2O ve spalinách infračerveným analyzátory a možnosti zlepšení měření

    Czech Academy of Sciences Publication Activity Database

    Čermák, Jiří; Svoboda, Karel; Hartman, Miloslav

    Praha : Procesní inženýrství, 1999 - (Pešinová, E.; Tvrdíková, A.). s. 151 ISBN 80-86059-28-6. [Konference chemického a procesního inženýrství CHISA'99 /46./. 18.10.1999-21.10.1999, Srní] Subject RIV: CI - Industrial Chemistry, Chemical Engineering

  1. Generátory koherentního EUV/měkkého rtg. záření založené na impulsních silnoproudých výbojích stabilizovaných blízkou stěnou

    Czech Academy of Sciences Publication Activity Database

    Koláček, Karel; Schmidt, Jiří; Prukner, Václav; Štraus, Jaroslav; Frolov, Oleksandr

    2009-01-01

    Roč. 59, č. 4 (2009), s. 218-223. ISSN 0009-0700 R&D Projects: GA AV ČR KAN300100702; GA AV ČR KJB100430702; GA MŠk LA08024 Institutional research plan: CEZ:AV0Z20430508 Keywords : pulsed high-current capillary discharge * EUV/soft X-ray laser Subject RIV: BL - Plasma and Gas Discharge Physics

  2. RAYS: a geometrical optics code for EBT

    Energy Technology Data Exchange (ETDEWEB)

    Batchelor, D.B.; Goldfinger, R.C.

    1982-04-01

    The theory, structure, and operation of the code are described. Mathematical details of equilibrium subroutiones for slab, bumpy torus, and tokamak plasma geometry are presented. Wave dispersion and absorption subroutines are presented for frequencies ranging from ion cyclotron frequency to electron cyclotron frequency. Graphics postprocessors for RAYS output data are also described.

  3. Economic Outlook for 2009

    Institute of Scientific and Technical Information of China (English)

    David; Dollar; Khalid; Malik

    2009-01-01

    In the wake of the bumpy ride in 2008, where will the Chinese economy go in the midst of the global financial turmoil, and how will it fend off the devastating effects of an international economic recession? Beijing Review interviewed 10 economists and experts to get their insights about China’s economic prospects this year.

  4. The National Writing Project after 22 Years.

    Science.gov (United States)

    Smith, Mary Ann

    1996-01-01

    For 22 years, at 166 sites around the world, over 1 million teachers have been teaching each other in nearly identical National Writing Project summer institutes. This article discusses the lessons learned about teacher leadership, the qualities of worthwhile staff development, writing instruction, and educational reform's bumpy landscape. (MLH)

  5. View from 30,000 Feet

    Science.gov (United States)

    Freifeld, Lorri

    2012-01-01

    Orchestrating a smooth training transition during a merger or acquisition is never easy. When Delta Air Lines absorbed Northwest Airlines Corp. in 2008, the Training function realized it was in for a bumpy ride. This article looks at the strategies used and progress made since the takeover was announced.

  6. Annual progress on DoE Grant for Nonlinear and Nonideal MHD

    International Nuclear Information System (INIS)

    The primary efforts this year have focused on exploring the nonlinear evolution of localized interchange instabilities, some extensions of neoclassical tearing mode theory, and developing a model for the dynamic electrical conductivity in a bumpy cylinder magnetic field. In addition, we have vigorously participated in the computationally-focused NIMROD and CEMM projects

  7. Coparenting Difficulties: Effects on Infants and Toddlers

    Science.gov (United States)

    McHale, James P.

    2007-01-01

    This article was excerpted from the author's "Charting the Bumpy Road of Coparenthood: Understanding the Challenges of Family Life", published in 2007 by "ZERO TO THREE." In the "Families Through Time" longitudinal study, James P. McHale and a number of colleagues met with expectant couples and then followed the families when the infants were 3…

  8. CAMAC based inter-compter communications system

    Energy Technology Data Exchange (ETDEWEB)

    Greenwood, D.E.; Burris, R.D.; Young, K.G.

    1981-10-01

    We have used CAMAC hardware to provide communications between dissimilar computers for the ELMO Bumpy Torus (EBT) experiment. The software supports file and individual message transfers. The system has proven to be both reliable and fast, with transmission rates of about 36,000 baud.

  9. EBT-P project status report

    International Nuclear Information System (INIS)

    This Elmo Bumpy Torus Report describes the status of the EBT-P Project in September 1983 after phasedown of the Title II design effort. The report is intended to be a principle source of guidance in the event of a decision to resume work on the project

  10. Variation in blade morphology of the kelp Eisenia arborea : incipient speciation due to local water motion?

    NARCIS (Netherlands)

    Roberson, LM; Coyer, JA

    2004-01-01

    The southern sea palm kelp Eisenia arborea produces wide, bullate (bumpy) blades in low-flow areas, whereas in adjacent high-flow areas blades are flat and narrow. Here we determine if morphological differences in these 2 closely associated populations are correlated with physical factors in the env

  11. CAMAC based inter-compter communications system

    International Nuclear Information System (INIS)

    We have used CAMAC hardware to provide communications between dissimilar computers for the ELMO Bumpy Torus (EBT) experiment. The software supports file and individual message transfers. The system has proven to be both reliable and fast, with transmission rates of about 36,000 baud

  12. Ultrastructural assessment of cellulite morphology: clues to a therapeutic strategy?

    OpenAIRE

    Omi, Tokuya; Sato, Shigeru; Kawana, Seiji

    2013-01-01

    Introduction and Aims: Cellulite is a problematic condition affecting mostly women, characterized by a bumpy or nodular skin surface. Recent approaches with laser treatment have offered some promise. The present study sought to identify possible targets for laser treatment or light therapy through an ultrastructural investigation of the condition.

  13. RAYS: a geometrical optics code for EBT

    International Nuclear Information System (INIS)

    The theory, structure, and operation of the code are described. Mathematical details of equilibrium subroutiones for slab, bumpy torus, and tokamak plasma geometry are presented. Wave dispersion and absorption subroutines are presented for frequencies ranging from ion cyclotron frequency to electron cyclotron frequency. Graphics postprocessors for RAYS output data are also described

  14. Coping with Hearing Loss and High School

    Science.gov (United States)

    Exceptional Parent, 2010

    2010-01-01

    High school can be a bumpy road for teenagers, especially since most teenagers are trying to fit in and start to define their own individuality and future. Now imagine if a teenager has hearing loss. Besides not being able to hear their instructors or friends as well as their classmates, self image problems can be magnified if they need to wear…

  15. Beyond Public Spending

    Science.gov (United States)

    Corney, Mark

    2009-01-01

    Britain is in the longest recession since the Second World War. Mass unemployment is back. The road to recovery could be long and bumpy. On the fiscal front, the deficit could be higher than the 175 billion British Pounds forecast for 2009-10. Bringing the deficit under control will require higher taxes and lower public spending. In an effort to…

  16. An evaluation of known remaining oil resources in the United States. Appendix, Project on Advanced Oil Recovery and the States

    Energy Technology Data Exchange (ETDEWEB)

    1994-10-01

    This volume contains appendices for the following: Overview of improved oil recovery methods (enhanced oil recovery methods and advanced secondary recovery methods); Benefits of improved oil recovery, selected data for the analyzed states; and List of TORIS fields and reservoirs.

  17. What Is COPD?

    Medline Plus

    Full Text Available ... going to be able to breath. And Tory, the older one said, "Why are you breathing like that?" Announcer: It says here that it's the fourth leading cause of death and a leading ...

  18. Classical Billiards in a Magnetic Field and a Potential

    CERN Document Server

    Berglund, N

    1996-01-01

    We study billiards in plane domains, with a perpendicular magnetic field and a potential. We give some results on periodic orbits, KAM tori and adiabatic invariants. We also prove the existence of bound states in a related scattering problem.

  19. Tõnu Kaalep kuulab plaate,mille autoriks on naised / Tõnu Kaalep

    Index Scriptorium Estoniae

    Kaalep, Tõnu, 1966-

    2001-01-01

    Heliplaatidest: Tori Amos "Strange Little Girls", Suzanne Vega "Songs in Red and Gray", Tracy Chapman "Collection", Sandy Dillon & Hector Zazou "12 (Las Vegas is Cursed)", Anja Garbarek "Smiling & Waving"

  20. Siidii / Annika Koppel

    Index Scriptorium Estoniae

    Koppel, Annika

    2003-01-01

    Heliplaatidest: "Careful What You Wish For", Sophie Ellis Bextor "Shoot From The Hip", Josh Groban "Closer", Tori Amos "Tales Of Librarian", Enigma "Voyageur", Eesti Filharmoonia Kammerkoor, dirigent Paul Hillier "The Powers Of Heaven"

  1. Plaadid / Jüri F. Lotman

    Index Scriptorium Estoniae

    Lotman, Jüri F.

    2004-01-01

    Uutest plaatidest Lil Jon & The East Side Boys "Kings of Crunk", Tori Amos "Tales Of A librarian", rebekka Bakken "The Art Of How To Fall", Slow Train Soul "Illegal Cargo", Marcos Valle "Contrasts", The beatles "Let It Be...Naked"

  2. Plaadid / Valner Valme

    Index Scriptorium Estoniae

    Valme, Valner, 1970-

    2002-01-01

    Uutest plaatidest "30 Seconds To Mars", E-Rotic "Sexual Healing", Mandarava & Buchert "Feng Shui", Vanessa Mae "The Best Of", Leann Rimes "Twisted Angel" Xzibit "Man vs Mashine", India. Airie "Voyage To India", Tori Amos "Scarlet Walk"

  3. Sealaudast noobliks saunaks / Karin Paulus

    Index Scriptorium Estoniae

    Paulus, Karin, 1975-

    2010-01-01

    Veera ja Pauli Kase Tori vallas asuva kodu maakivist majapooles paiknev muljetavaldav saun koos kahe külalistetoaga on ümber ehitatud endisaegsest loomalaudast. Saun üllatab vooklevate vormide ning algupäraste materjalide eksponeerimisega

  4. What Is COPD?

    Medline Plus

    Full Text Available ... Tory, the older one said, "Why are you breathing like that?" Announcer: It says here that it's ... a little bit about how COPD affects your breathing. Edna: Sure, let me show you. When we' ...

  5. Christmas Chill

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    For numerous Chinese exporters, this year’s Christmas season means more despair than cheerWandering through his toy fac- tory in Shenzhen, Guangdong Province, Lin Zhanpeng barks orders as a few workers move around machines

  6. Semiclassical description of exotic nuclear shapes

    International Nuclear Information System (INIS)

    Exotic nuclear structures such as bubbles and tori are analyzed through semiclassical extended Thomas-Fermi calculations with the Skyrme force SkM*. The variational equations for neutron and proton densities are solved fully self-consistently in spherical (bubbles) and cylindrical (tori) symmetries. The possible existence of bubble configurations in some astrophysical scenarios is discussed. The stability of toroidal structures against change of quadrupole moment is studied. A global minimum of the energy is found in heavy toroidal nuclei. (author)

  7. Jak ovlivnit spotřebitele na trhu IT a telekomunikací?

    OpenAIRE

    Němečková, Klára

    2006-01-01

    Práce ukazující stav trhu telekomunikací a informačních technologií v ČR, operátory, jejich služby. Hodnotí operátory z pohledu spotřebitele a ukazují co spotřebitel chce a nechce na konkrétním trhu.

  8. On the Construction of "Emotional Intelligence" Dormi-tory Culture and the Promotion of Students' Comprehen-sive Psychological Quality:Taking Qingdao Harbour Vo-cational and Technical College for an Example%“情商型”宿舍文化建设与学生心理素质提升研究--以青岛港湾职业技术学院为例

    Institute of Scientific and Technical Information of China (English)

    马桂兰

    2016-01-01

    "Emotional intelligence"dormitory culture emphasizes dormitory culture's mental health education function, emphasizes the dormitory culture's influence on the students' psychological quality. The article discussed the connotation and construction approaches of"emotional intelligence"dormitory culture's mental health approaches, investigated some students' psychological quality before and after the construction of psychological health culture of dormitory.%“情商型”宿舍文化强调宿舍文化的心理健康教育功能,强调宿舍文化对同学提高心理素质的影响。文章探讨了“情商型”宿舍心理健康文化的内涵与建设途径,调查了部分宿舍的同学在宿舍文化建设前后心理素质的变化情况。

  9. A Practical Foundation for Mapping Black Hole Spacetimes

    Science.gov (United States)

    Vigeland, Sarah; Hughes, Scott

    2010-02-01

    Observations have shown that the universe contains many compact and massive objects that are believed to be black holes. Precise observations of orbital motion near candidate black holes have the potential to determine if they have the spacetime structure predicted by general relativity. We propose to compare strong-field observations of compact objects with the spacetime of bumpy black holes: objects whose multipolar structure is almost, but not quite, equal to that of the Kerr spacetime. We build bumpy black hole spacetimes by adding a perturbation onto a Kerr black hole, and we show how to map the perturbation onto changes in the multipole moments. The perturbation results in changes to the orbital frequencies which we calculate using Hamilton-Jacobi techniques. )

  10. The non-integrability of the Zipoy-Voorhees metric

    CERN Document Server

    Lukes-Gerakopoulos, Georgios

    2012-01-01

    The low frequency gravitational wave detectors like eLISA/NGO will give us the opportunity to test whether the supermassive compact objects lying at the centers of galaxies are indeed Kerr black holes. A way to do such a test is to compare the gravitational wave signals with templates of perturbed black hole spacetimes, the so-called bumpy black hole spacetimes. The Zipoy-Voorhees (ZV) spacetime (known also as the $\\gamma$ spacetime) can be included in the bumpy black hole family, because it can be considered as a perturbation of the Schwarzschild spacetime background. Several authors have suggested that the ZV metric corresponds to an integrable system. Contrary to this integrability conjecture, in the present article it is shown by numerical examples that in general ZV belongs to the family of non-integrable systems.

  11. CRISIS FOCUS Risks and the Road To Recovery

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    With global financial woes abating, the world economy appears to have found its footing. Emerging Asian economies have steered a steady course toward recovery while Western countries leave the worst times behind. But the road ahead may be a bumpy one given the fact that an array of underly- ing risks still loom large. Tao Dong, a senior economist with Credit Suisse, shared his opinions on these issues in an article recently published on his blog. Edited excerpts follow:

  12. Articulating Expectations for PhD Candidature upon Commencement: Ensuring Supervisor/Student "Best Fit"

    Science.gov (United States)

    Moxham, Lorna; Dwyer, Trudy; Reid-Searl, Kerry

    2013-01-01

    The journey towards completion of a PhD is a bumpy one for many. One of the major factors that influence successful and on-time thesis completion is the relationship that the PhD candidate has with her or his supervisor. This paper presents results from research undertaken using a 12-item survey to collect data from a purposive sample: PhD…

  13. GWAS to Sequencing: Divergence in Study Design and Analysis

    OpenAIRE

    Christopher Ryan King; Nicolae, Dan L.

    2014-01-01

    The success of genome-wide association studies (GWAS) in uncovering genetic risk factors for complex traits has generated great promise for the complete data generated by sequencing. The bumpy transition from GWAS to whole-exome or whole-genome association studies (WGAS) based on sequencing investigations has highlighted important differences in analysis and interpretation. We show how the loss in power due to the allele frequency spectrum targeted by sequencing is difficult to compensate for...

  14. Google FITTING IN

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Search engine giant’s path to China is proving to be a bumpy ride You have to hand it to Google; it knows how to make a big splash. When the doyen of search engines came to town to reinvent itself, no expense was spared. Booking the banquet hall of Beijing’s most famous five-star hotel, cramming it full of the cream of the IT world and a gaggle of journalists from 170 news agencies,

  15. Shaping of ferromagnetic wall for linked min.-B configuration

    International Nuclear Information System (INIS)

    A possibility to form a linked minimum-B configuration by the use of ferromagnetic materials is studied analytically. In particular both l = 2 and l = 3 cases are investigated in detail. By arrangement of the helically modulated, bumpy wall in a periodical array, the linked minimum-B system is able to be constructed. A typical case of wall arrangement is also illustrated. (author)

  16. Pure-Nickel-Coated Multiwalled Carbon Nanotubes Prepared by Electroless Deposition

    OpenAIRE

    Arai, Susumu; Kobayashi, Mitsuhiro; Yamamoto, Tohru; Endo, Morinobu

    2010-01-01

    Pure-nickel-coated multiwalled carbon nanotubes (MWCNTs) have been prepared by electroless deposition. Gluconic acid and hydrazine were respectively used as the complexing and reducing agents for nickel ions. The deposits were heat-treated. The microstructures and magnetic properties of the deposits were examined. The MWCNTs were homogeneously coated with pure nickel and their surfaces were relatively bumpy. These pure-nickel-coated MWCNTs exhibited ferromagnetism and had higher magnetization...

  17. One-dimensional gamma-ray shielding analysis for EBT-P

    Energy Technology Data Exchange (ETDEWEB)

    Gohar, Y.

    1981-11-01

    A one-dimensional scoping study was performed for the gamma ray shield of the ELMO Bumpy Torus proof-of-principle (EBT-P) device. The objective was to define appropriate shielding material and determine the required shielding thickness for EBT-P. The dose equivalent results as a function of the radiation shield thickness for different shielding options are presented. A sensitivity analysis for the pessimistic case is given. The recommended shielding option based on the performance and cost is discussed.

  18. Executive summary: advanced-fuel fusion systems, the D-3He satellite approach

    International Nuclear Information System (INIS)

    An evaluation was made of the potential advantages and feasibility of fusion power plants designed to employ near-term non-D--T fuels such as deuterium and D-3He. The following topics are discussed here: (1) cost studies and net-energy analysis, (2) D-3He Bumpy Torus satellite, (3) exploratory studies of a D-3He field-reversed mirror satellite, (4) preliminary advanced fuel pellet studies, and (5) 3He neutral beam injector

  19. MARKET WATCH

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    China’s exports are tapering off as the world economy teeters,but investment and consumption have maintained momentum, offsetting the impact of weakening exports. The auto market continues cooling as the with drawal of policy incentives pours cold water on buyers’interest. A bright spot is the ecommerce sector, which reported surprisingly brisk growth in the third quarter. China’s industries are currently the world’s most competitive, but the road ahead will be a bumpy one.

  20. Studies of heating efficiencies and models of RF-sheaths for the JET antennae

    International Nuclear Information System (INIS)

    A theoretical model for the appearance of RF-sheaths is developed to see if this can explain the expected lower heating efficiencies of the new A2 antennae at JET. The equations are solved numerically. A general method for evaluation of the experimental data of the heating efficiencies of the new antennae at JET is developed and applied for discharges with and without the bumpy limiter on the D antennae. 8 refs, 26 figs

  1. Earning Their Keep

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Women face gender discrimination in the job market Yi Rongrong,a postgraduate student at the Communication University of China in Beijing,describes her jobhunting process as a "bumpy road," though she has a good record in the university with quite a few scholarships and internship experiences at Xinhua News Agency and People’s Daily,two of the leading media organizations in China.

  2. Symmetric Kullback-Leibler Metric Based Tracking Behaviors for Bioinspired Robotic Eyes

    Directory of Open Access Journals (Sweden)

    Hengli Liu

    2015-01-01

    Full Text Available A symmetric Kullback-Leibler metric based tracking system, capable of tracking moving targets, is presented for a bionic spherical parallel mechanism to minimize a tracking error function to simulate smooth pursuit of human eyes. More specifically, we propose a real-time moving target tracking algorithm which utilizes spatial histograms taking into account symmetric Kullback-Leibler metric. In the proposed algorithm, the key spatial histograms are extracted and taken into particle filtering framework. Once the target is identified, an image-based control scheme is implemented to drive bionic spherical parallel mechanism such that the identified target is to be tracked at the center of the captured images. Meanwhile, the robot motion information is fed forward to develop an adaptive smooth tracking controller inspired by the Vestibuloocular Reflex mechanism. The proposed tracking system is designed to make the robot track dynamic objects when the robot travels through transmittable terrains, especially bumpy environment. To perform bumpy-resist capability under the condition of violent attitude variation when the robot works in the bumpy environment mentioned, experimental results demonstrate the effectiveness and robustness of our bioinspired tracking system using bionic spherical parallel mechanism inspired by head-eye coordination.

  3. Symmetric Kullback-Leibler Metric Based Tracking Behaviors for Bioinspired Robotic Eyes

    Science.gov (United States)

    Liu, Hengli; Luo, Jun; Wu, Peng; Xie, Shaorong; Li, Hengyu

    2015-01-01

    A symmetric Kullback-Leibler metric based tracking system, capable of tracking moving targets, is presented for a bionic spherical parallel mechanism to minimize a tracking error function to simulate smooth pursuit of human eyes. More specifically, we propose a real-time moving target tracking algorithm which utilizes spatial histograms taking into account symmetric Kullback-Leibler metric. In the proposed algorithm, the key spatial histograms are extracted and taken into particle filtering framework. Once the target is identified, an image-based control scheme is implemented to drive bionic spherical parallel mechanism such that the identified target is to be tracked at the center of the captured images. Meanwhile, the robot motion information is fed forward to develop an adaptive smooth tracking controller inspired by the Vestibuloocular Reflex mechanism. The proposed tracking system is designed to make the robot track dynamic objects when the robot travels through transmittable terrains, especially bumpy environment. To perform bumpy-resist capability under the condition of violent attitude variation when the robot works in the bumpy environment mentioned, experimental results demonstrate the effectiveness and robustness of our bioinspired tracking system using bionic spherical parallel mechanism inspired by head-eye coordination. PMID:27019592

  4. EVALUATION OF SEAT VIBRATION SOURCES IN DRIVING CONDITION USING SPECTRAL ANALYSIS

    Directory of Open Access Journals (Sweden)

    AHMAD KAMAL

    2011-06-01

    Full Text Available Seat vibration is one of the major causes of discomfort in moving vehicle. Tyre, engine, drivetrain and aerodynamic forces excite the cabin and interior through various pathways. In this paper, the contributions of tyre and engine vibration to seat excitations are studied. Virtual Source Analysis (VSA is implemented to decompose the source signals into incoherent phenomena. Studying these phenomena (virtual sources shows the amount and frequency bands that physical sources affect the seat vibration as the response channel. Experiment is conducted while riding on smooth and bumpy roads. Road roughness is characterized using International Roughness Index (IRI. VSA technique approve that tyre is the main source of seat vibration for the moving vehicle. Seat vibration has significant values below 400 Hz and tyre is found to be the dominant source of excitations for both smooth and bumpy roads. For smooth road, strong engine harmonics below 200 Hz also has some involvements. But in bumpy road, tyre vibration rise up and become the dominant broadband source of excitations. Tyre damper and engine mount Frequency Response Function (FRF analysis show that these parts are designed to be highly efficient below 1400 Hz and 200 Hz, respectively. These ranges are identical with those that were found as the critical operational frequency spans in VSA.

  5. Symmetric Kullback-Leibler Metric Based Tracking Behaviors for Bioinspired Robotic Eyes.

    Science.gov (United States)

    Liu, Hengli; Luo, Jun; Wu, Peng; Xie, Shaorong; Li, Hengyu

    2015-01-01

    A symmetric Kullback-Leibler metric based tracking system, capable of tracking moving targets, is presented for a bionic spherical parallel mechanism to minimize a tracking error function to simulate smooth pursuit of human eyes. More specifically, we propose a real-time moving target tracking algorithm which utilizes spatial histograms taking into account symmetric Kullback-Leibler metric. In the proposed algorithm, the key spatial histograms are extracted and taken into particle filtering framework. Once the target is identified, an image-based control scheme is implemented to drive bionic spherical parallel mechanism such that the identified target is to be tracked at the center of the captured images. Meanwhile, the robot motion information is fed forward to develop an adaptive smooth tracking controller inspired by the Vestibuloocular Reflex mechanism. The proposed tracking system is designed to make the robot track dynamic objects when the robot travels through transmittable terrains, especially bumpy environment. To perform bumpy-resist capability under the condition of violent attitude variation when the robot works in the bumpy environment mentioned, experimental results demonstrate the effectiveness and robustness of our bioinspired tracking system using bionic spherical parallel mechanism inspired by head-eye coordination. PMID:27019592

  6. Plane shear flows of frictionless spheres: Kinetic theory and 3D soft-sphere discrete element method simulations

    Energy Technology Data Exchange (ETDEWEB)

    Vescovi, D.; Berzi, D. [Department of Civil and Environmental Engineering, Politecnico di Milano, Milan 20133 (Italy); Richard, P. [LUNAM Université, IFSTTAR, site de Nantes, GPEM/MAST, route de Bouaye CS 4, 44344 Bouguenais (France); Brodu, N. [Department of Physics, Duke University, Durham, North Carolina 27708 (United States)

    2014-05-15

    We use existing 3D Discrete Element simulations of simple shear flows of spheres to evaluate the radial distribution function at contact that enables kinetic theory to correctly predict the pressure and the shear stress, for different values of the collisional coefficient of restitution. Then, we perform 3D Discrete Element simulations of plane flows of frictionless, inelastic spheres, sheared between walls made bumpy by gluing particles in a regular array, at fixed average volume fraction and distance between the walls. The results of the numerical simulations are used to derive boundary conditions appropriated in the cases of large and small bumpiness. Those boundary conditions are, then, employed to numerically integrate the differential equations of Extended Kinetic Theory, where the breaking of the molecular chaos assumption at volume fraction larger than 0.49 is taken into account in the expression of the dissipation rate. We show that the Extended Kinetic Theory is in very good agreement with the numerical simulations, even for coefficients of restitution as low as 0.50. When the bumpiness is increased, we observe that some of the flowing particles are stuck in the gaps between the wall spheres. As a consequence, the walls are more dissipative than expected, and the flows resemble simple shear flows, i.e., flows of rather constant volume fraction and granular temperature.

  7. Plane shear flows of frictionless spheres: Kinetic theory and 3D soft-sphere discrete element method simulations

    International Nuclear Information System (INIS)

    We use existing 3D Discrete Element simulations of simple shear flows of spheres to evaluate the radial distribution function at contact that enables kinetic theory to correctly predict the pressure and the shear stress, for different values of the collisional coefficient of restitution. Then, we perform 3D Discrete Element simulations of plane flows of frictionless, inelastic spheres, sheared between walls made bumpy by gluing particles in a regular array, at fixed average volume fraction and distance between the walls. The results of the numerical simulations are used to derive boundary conditions appropriated in the cases of large and small bumpiness. Those boundary conditions are, then, employed to numerically integrate the differential equations of Extended Kinetic Theory, where the breaking of the molecular chaos assumption at volume fraction larger than 0.49 is taken into account in the expression of the dissipation rate. We show that the Extended Kinetic Theory is in very good agreement with the numerical simulations, even for coefficients of restitution as low as 0.50. When the bumpiness is increased, we observe that some of the flowing particles are stuck in the gaps between the wall spheres. As a consequence, the walls are more dissipative than expected, and the flows resemble simple shear flows, i.e., flows of rather constant volume fraction and granular temperature

  8. AcEST: DK957554 [AcEST

    Lifescience Database Archive (English)

    Full Text Available plantlets Developmental stage gametophytes with sporophytes C...us-veneris mRNA. clone: TST39A01NGRL0028_K21. 5' end sequence. Accession DK957554 Tissue type prothallia with...|Q67SM3|Q67SM3_SYMTH Putative uncharacterized protein OS=Symbiobacterium thermophilum Align length 31 Score (bit) 35.4 E-val...ochrome c-type protein torY OS=Haemophil... 30 8.3 >sp|O73691|EGR1_CHICK Early growth response prote...SPAHTTFPSPSIATTYS 148 >sp|P44799|TORY_HAEIN Cytochrome c-type protein torY OS=Haemophilus influenzae GN=torY PE=3 SV=1 Length

  9. Schoen manifold with line bundles as resolved magnetized orbifolds

    International Nuclear Information System (INIS)

    We give an alternative description of the Schoen manifold as the blow-up of a Z2 x Z2 orbifold in which one Z2 factor acts as a roto-translation. Since for this orbifold the fixed tori are only identified in pairs but not orbifolded, four-dimensional chirality can never be obtained using standard techniques alone. However, chirality is recovered when its tori become magnetized. To exemplify this, we construct an SU(5) GUT on the Schoen manifold with Abelian gauge fluxes, which becomes an MSSM with three generations after an appropriate Wilson line is associated to its freely acting involution. We reproduce this model as a standard orbifold CFT of the (partially) blown down Schoen manifold with a magnetic flux. Finally, in analogy to a proposal for non-perturbative heterotic models by Aldazabal et al. we suggest modifications to the heterotic orbifold spectrum formulae in the presence of magnetized tori.

  10. Schoen manifold with line bundles as resolved magnetized orbifolds

    Energy Technology Data Exchange (ETDEWEB)

    Groot Nibbelink, Stefan [Muenchen Univ. (Germany). Arnold Sommerfeld Center for Theoretical Physics; Vaudrevange, Patrick K.S. [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)

    2012-12-15

    We give an alternative description of the Schoen manifold as the blow-up of a Z{sub 2} x Z{sub 2} orbifold in which one Z{sub 2} factor acts as a roto-translation. Since for this orbifold the fixed tori are only identified in pairs but not orbifolded, four-dimensional chirality can never be obtained using standard techniques alone. However, chirality is recovered when its tori become magnetized. To exemplify this, we construct an SU(5) GUT on the Schoen manifold with Abelian gauge fluxes, which becomes an MSSM with three generations after an appropriate Wilson line is associated to its freely acting involution. We reproduce this model as a standard orbifold CFT of the (partially) blown down Schoen manifold with a magnetic flux. Finally, in analogy to a proposal for non-perturbative heterotic models by Aldazabal et al. we suggest modifications to the heterotic orbifold spectrum formulae in the presence of magnetized tori.

  11. Bilateral Mandibular Torus and an Ankylosed Third Molar: A Case Report

    Directory of Open Access Journals (Sweden)

    Hasan Onur Şimşek

    2016-04-01

    Full Text Available Environmental factors, genetic heritage, increased biting function and nutrition are some of the reason for intraoral exostosis to get developed. Torus mandibularis is one of the types of exostosis in the oral region, which is unilaterally or bilaterally located in the lingual aspect of the body of the mandible above the mylohyoid line. There is usually no need for biopsy for the diagnosis of tori. In symptomatic cases, excision is the treatment of choice. In this paper, a 65-year-old man with a wide bilateral mandibular torus and an ankylosed mandibular right third molar tooth with mucosal retention is presented and general information was given about tori. In relation with this case, it was thought that dental ankylosis and tori may occur together because of similar etiological factors.

  12. Quasi-periodic motions in families of dynamical systems order amidst chaos

    CERN Document Server

    Broer, Hendrik W; Sevryuk, Mikhail B

    1996-01-01

    This book is on Kolmogorov-Arnol'd-Moser theory for quasi-periodic tori in dynamical systems. It gives an up-to-date report on the role parameters play for persis- tence of such tori, typically occuring on Cantor sets of positive Hausdorff measure inside phase and parameter space. The cases with preservation of symplectic or volume forms or time-reversal symmetries are included. The concepts of Whitney-smoothness and Diophantine approximation of Cantor sets on submanifolds of Euclidean space are treated, as well as Bruno's theory on analytic continuation of tori. Partly this material is new to Western mathematicians. The reader should be familiar with dynamical systems theory, differen- tial equations and some analysis. The book is directed to researchers, but its entrance level is introductory.

  13. 柔術の技法と柔道

    OpenAIRE

    村山,輝志; 有山, 篤利; 服部,洋児

    1983-01-01

    The purpose of this study is analyze the techique of Jujitsu can be said to be a antecedent of Kodokan Judo and find' consider the characteristics of its techique. According to this purpose, 299 kinds of techinque, on the Takenouchi-ryu and Shindotenshin-ryu Tenshinshinyo-ryu, Shinkage-ryu were took up, and the motions of tori and uke were analized in respect to attack and either of tori or uke. First, a kind of deed, a name of finishing deed, the attacking part, the method of attacking. The ...

  14. The parameterization method for invariant manifolds from rigorous results to effective computations

    CERN Document Server

    Haro, Àlex; Figueras, Jordi-Lluis; Luque, Alejandro; Mondelo, Josep Maria

    2016-01-01

    This monograph presents some theoretical and computational aspects of the parameterization method for invariant manifolds, focusing on the following contexts: invariant manifolds associated with fixed points, invariant tori in quasi-periodically forced systems, invariant tori in Hamiltonian systems and normally hyperbolic invariant manifolds. This book provides algorithms of computation and some practical details of their implementation. The methodology is illustrated with 12 detailed examples, many of them well known in the literature of numerical computation in dynamical systems. A public version of the software used for some of the examples is available online. The book is aimed at mathematicians, scientists and engineers interested in the theory and applications of computational dynamical systems.

  15. Bifurcation structure of the C-type period-doubling transition

    DEFF Research Database (Denmark)

    Laugesen, Jakob Lund; Mosekilde, Erik; Zhusubaliyev, Zhanybai T.

    2012-01-01

    The period-doubling transition to chaos along the edge of an Arnold tongue is known to display unusual organization and scaling behavior (Kuznetsov et al. (2005) [7]). It is also known that forced period-doubling systems may be associated with the appearance of so-called period-doubled tori...... (Arneodo et al. (1983) [15]). Using the Rössler system as an example, we present a detailed analysis of the bifurcation structure associated with the forcing of a three-dimensional period-doubling system. We explain how this structure is related to the recently discovered phenomenon of multi-layered tori...

  16. Comparative study between toroidal coordinates and the magnetic dipole field

    CERN Document Server

    Chávez-Alarcón, Esteban

    2012-01-01

    There is a similar behaviour between the toroidal coordinates and the dipole magnetic field produced by a circular loop. In this work we evaluate up to what extent the former can be used as a representation of the latter. While the tori in the toroidal coordinates have circular cross sections, those of the circular loop magnetic field are nearly elliptical ovoids, but they are very similar for large aspect ratios.The centres of the latter displace from the axis faster than the former. By making a comparison between tori of similar aspect ratios, we find quantitative criteria to evaluate the accuracy of the approximation.

  17. Production and Development of LRCO‘s Silica Bricks

    Institute of Scientific and Technical Information of China (English)

    MAXianghong; LIZhenmin; 等

    1998-01-01

    This paper reviews the history of development and production of silica bricks at Luoyang Refrac-tories(Group) Co.,Ltd,(Former Luoyang Refrac-tories Factory). Through the improvement and in-troducing technology from abroad the company's management and quality standard on silica bricks production has reached a higher level.The physical and chemical specifications,as well as the appear-ance of silica bricks for coke ovens,hot blast stoves and glass kilns have reached the advanced interna-tional level.Now the company has become producing base and main exporting base various kinds of silica bricks in China.

  18. The geometry of the Double Gyroid wire network: Quantum and Classical

    CERN Document Server

    Kaufmann, Ralph M; Wehefritz-Kaufmann, Birgit

    2010-01-01

    Quantum wire networks have recently become of great interest. Here we deal with a novel nano material structure of a Double Gyroid wire network. We use methods of commutative and non-commutative geometry to describe this wire network. Its non--commutative geometry is closely related to non-commutative 3-tori as we discuss in detail.

  19. Topic: Single-sex Education in the UK

    Institute of Scientific and Technical Information of China (English)

    王其寓

    2015-01-01

    The Tory leadership contender Liam Fox claimed that boys should be taught in single-sex schools.(The Guardian,2005)According to his point,the new debate about the merits and drawbacks of single-sex education becoming increasingly intense in the United Kingdom.Boys and girls should be teaching

  20. Koorifestival rändab ringi

    Index Scriptorium Estoniae

    2006-01-01

    Laste- ja noortekooride suurkontserdist "Olen nii, nagu tahan" 26. mail Pärnu Kontserdimajas Pärnu rahvusvahelise koorifestivali raames, kontsertidest Sindi seltsimajas, Häädemeeste ja Pärnu-Jaagupi kirikus, Kilingi-Nõmme klubis, Tori rahvamajas ja Tõstamaa keskkoolis

  1. Topological effects on string vacua

    CERN Document Server

    Loaiza-Brito, Oscar

    2011-01-01

    We review some topological effects on the construction of string flux-vacua. Specifically we study the effects of brane-flux transitions on the stability of D-branes on a generalized tori compactificaction, the transition that a black hole suffers in a background threaded with fluxes and the connections among some Minkowsky vacua solutions.

  2. Update History of This Database - DGBY | LSDB Archive [Life Science Database Archive metadata

    Lifescience Database Archive (English)

    Full Text Available [ Credits ] BLAST Search Image Search Home About Archive Update History Contact us DGBY Update History...tory of This Database Site Policy | Contact Us Update History of This Database - DGBY | LSDB Archive ... ...yakudachi/yeast/index.html ) is opened. Joomla SEF URLs by Artio About This Database Database Description Download License Update His

  3. Image File - TP Atlas | LSDB Archive [Life Science Database Archive metadata

    Lifescience Database Archive (English)

    Full Text Available [ Credits ] BLAST Search Image Search Home About Archive Update History Contact us ...d - Number of data entries 35 entries - Joomla SEF URLs by Artio About This Database Database Description Download License Update His...tory of This Database Site Policy | Contact Us Image File - TP Atlas | LSDB Archive ...

  4. TORC2 mediates the heat stress response in Drosophila by promoting the formation of stress granules

    NARCIS (Netherlands)

    Jevtov, Irena; Zacharogianni, Margarita; van Oorschot, Marinke M.; van Zadelhoff, Guus; Aguilera-Gomez, Angelica; Vuillez, Igor; Braakman, Ineke; Hafen, Ernst; Stocker, Hugo; Rabouille, Catherine

    2015-01-01

    The kinase TORis found in two complexes, TORC1,which is involved in growth control, and TORC2, whose roles are less well defined. Here, we asked whether TORC2 has a role in sustaining cellular stress. We show that TORC2 inhibition in Drosophila melanogaster leads to a reduced tolerance to heat stres

  5. Solvable groups and a shear construction

    DEFF Research Database (Denmark)

    Freibert, Marco; Swann, Andrew Francis

    The twist construction is a geometric model of T-duality that includes constructions of nilmanifolds from tori. This paper shows how one-dimensional foliations on manifolds may be used in a shear construction, which in algebraic form builds certain solvable Lie groups from Abelian ones. We discus...

  6. On the Witten--Reshetikhin--Turaev invariants of torus bundles

    DEFF Research Database (Denmark)

    Andersen, Jørgen Ellegaard; Jørgensen, Søren Fuglede

    By methods similar to those used by Lisa Jeffrey, we compute the quantum $\\SU(N)$-invariants for mapping tori of trace 2 homeomorphisms of a genus 1 surface when $N = 2,3$ and discuss their asymptotics. In particular, we obtain directly a proof of a version of Witten's asymptotic expansion conjec...

  7. Torus mapper: a code for dynamical models of galaxies

    CERN Document Server

    Binney, James

    2015-01-01

    We present a freely downloadable software package for modelling the dynamics of galaxies, which we call the Torus Mapper (TM). The package is based around `torus mapping', which is a non-perturbative technique for creating orbital tori for specified values of the action integrals. Given an orbital torus and a star's position at a reference time, one can compute its position at any other time, no matter how remote. One can also compute the velocities with which the star will pass through any given point and the contribution it will make to the time-averaged density there. A system of angle-action coordinates for the given potential can be created by foliating phase space with orbital tori. Such a foliation is facilitated by the ability of TM to create tori by interpolating on a grid of tori. We summarise the advantages of using TM rather than a standard time-stepper to create orbits, and give segments of code that illustrate applications of TM in several contexts, including setting up initial conditions for an...

  8. Efficient radioluminiscence of the Ce 3+ -doped Na-Gd phosphate glasses

    Czech Academy of Sciences Publication Activity Database

    Nikl, Martin; Nitsch, Karel; Mihóková, Eva; Solovieva, Natalia; Mareš, Jiří A.; Fabeni, P.; Pazzi, G.P.; Martini, M.; Vedda, A.; Baccaro, S.

    2000-01-01

    Roč. 77, č. 14 (2000), s. 2159-2161. ISSN 0003-6951 Grant ostatní: NATO S/P grant(XX) 973510 scintilátory Institutional research plan: CEZ:AV0Z1010914 Subject RIV: BM - Solid Matter Physics ; Magnetism Impact factor: 3.906, year: 2000

  9. An evaluation of known remaining oil resources in the United States: Appendix. Volume 10

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1993-11-01

    Volume ten contains the following appendices: overview of improved oil recovery methods which covers enhanced oil recovery methods and advanced secondary recovery methods; the benefits of improved oil recovery, selected data for the analyzed states; and list of TORIS fields and reservoirs.

  10. Inventory Surged More Than 60% in the Nonferrous Metals Industry in the First Half of 2012

    Institute of Scientific and Technical Information of China (English)

    2012-01-01

    <正>In the first half of this year,in the nonferrous metals industry listed companies’ inventory grew 63.46%. To some extent,changes in the inventory data of finished products mirror changes in the mutual dependence of suppliers and buyers,and changes in companies’ inven-tory often reflect future changes in industry prosperity.

  11. Examining a Treasure Trove

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    The Palace Museum inventories its collection For the first time in history, curators of the Palace Museum have finally inven- toried the museum’s vast collection. After seven years of painstaking work, the museum finally released the results of its first comprehensive inventory on January 26, showing that the museum houses 1,807,558 items.

  12. Torus Destruction and Chaos-Chaos Intermittency in a Commodity Distribution Chain

    DEFF Research Database (Denmark)

    Sosnovtseva, O.; Mosekilde, Erik

    1997-01-01

    The destruction of two-dimensional tori T2 and the transitions to chaos are studied in a high-dimensional model describing the decision-making behavior of human subjects in a simulated managerial environment (the beer production-distribution model). Two different routes from quasiperiodicity to c...

  13. The "Great Refusal"? A Marcusian Response to the Bright Blue Vision of Education in the "Big Society"

    Science.gov (United States)

    Bates, Agnieszka

    2015-01-01

    The modernisation of education and other public services remains a major political objective of the current Coalition government in the UK. This paper focuses on "Tory Modernisation 2.0," a blueprint for the second stage of the public sector reform produced by the Conservative pressure group, Bright Blue. From the critical theory…

  14. Bonnet Pairs of Surfaces in Minkowski Space

    OpenAIRE

    Grantcharov, G.; Salom, R.

    2012-01-01

    We review some results about Bonnet pairs in Minkowski space obtained using split quaternions and split complex numbers. We present also an example of Bonnet pairs of minimal immersed timelike tori with umbilical points. Such examples do not exists in the Euclidean space.

  15. BDML Datasets: 5 [SSBD[Archive

    Lifescience Database Archive (English)

    Full Text Available dt, J. and Stelzer, E.H.K. Philipp J. Keller, European Molecular Biology Laboratory, Cell Biology and Biophysics Unit, Stelzer Labora...tory See details in Keller et al. (2008) Science 322, 1065-1069. CC BY-NC-SA 1 x 1

  16. A KAM Theorem for Reversible Systems of Infinite Dimension

    Institute of Scientific and Technical Information of China (English)

    Shun Qing CHEN; Xiao Ping YUAN

    2007-01-01

    For reversible systems of infinite dimension we prove an infinitely dimensional KAM theoremwith an application to the network of weakly coupled oscillators of friction. The KAM theorem showsthat there are many invariant tori of infinite dimension, and thus many almost periodic solutions, forthe reversible systems.

  17. Interspecific hybridization and polyploidization as tools in ornamental plant breeding

    NARCIS (Netherlands)

    Tuyl, van J.M.; Kim, K.B.

    2003-01-01

    Interspecific hybridisation and polyploidy are recognized as the most impor-tant sources of evolution and domestication of flowering plants. In ornamental plant breeding these phenomena go hand in hand and can be observed in the breeding his-tory of many ornamental crops (Rosa, Chrysanthemum, Gladio

  18. Hopf-flip bifurcation of high dimensional maps and application to vibro-impact systems

    Institute of Scientific and Technical Information of China (English)

    Jianhua Xie; Wangcai Ding; E. H. Dowell; L.N. Virgin; Ron Marshall

    2005-01-01

    This paper addresses the problem ofHopf-flip bifurcation of high dimensional maps. Using the center manifold theorem, we obtain a three dimensional reduced map through the projection technique. The reduced map is further transformed into its normal form whose coefficients are determined by that of the original system. The dynamics of the map near the Hopf-flip bifurcation point is approximated by a so called "time-2τ2 map" of a planar autonomous differential equation. It is shown that high dimensional maps may result in cycles of period two, tori T1 (Hopf invariant circles), tori 2T1 and tori 2T2 depending both on how the critical eigenvalues pass the unit circle and on the signs of resonant terms' coefficients. A two-degree-of-freedom vibro-impact system is given as an example to show how the procedure of this paper works. It reveals that through Hopf-flip bifurcations, periodic motions may lead directly to different types of motion, such as subharmonic motions, quasi-periodic motions, motions on high dimensional tori and even to chaotic motions depending both on change in direction of the parameter vector and on the nonlinear terms of the first three orders.

  19. X-ray absorption, nuclear infrared emission and dust covering factors of AGN: testing Unification Schemes

    CERN Document Server

    Mateos, S; Alonso-Herrero, A; Hernán-Caballero, A; Barcons, X; Ramos, A Asensio; Watson, M G; Blain, A; Caccianiga, A; Ballo, L; Braito, V; Almeida, C Ramos

    2016-01-01

    We present the distributions of geometrical covering factors of active galactic nuclei (AGNs) dusty tori (f2) using an X-ray selected complete sample of 227 AGN drawn from the Bright Ultra-hard XMM-Newton Survey. The AGN have z from 0.05 to 1.7, 2-10 keV luminosities between 10^42 and 10^46 erg/s and Compton-thin X-ray absorption. Employing data from UKIDSS, 2MASS and the Wide-field Infrared Survey Explorer in a previous work we determined the rest-frame 1-20 microns continuum emission from the torus which we model here with the clumpy torus models of Nenkova et al. Optically classified type 1 and type 2 AGN are intrinsically different, with type 2 AGN having on average tori with higher f2 than type 1 AGN. Nevertheless, ~20 per cent of type 1 AGN have tori with large covering factors while ~23-28 per cent of type 2 AGN have tori with small covering factors. Low f2 are preferred at high AGN luminosities, as postulated by simple receding torus models, although for type 2 AGN the effect is certainly small. f2 in...

  20. Eventually Periodic Points of Infra-Nil Endomorphisms

    Directory of Open Access Journals (Sweden)

    Ha KuYong

    2010-01-01

    Full Text Available Hyperbolic toral automorphisms provide important examples of chaotic dynamical systems. Generalizing automorphisms on tori, we study (infra-nil endomorphisms defined on (infra-nilmanifolds. In particular, we show that every infra-nil endomorphism has dense eventually periodic points.

  1. Non Kaehler solvmanifolds with generalized Kaehler structure

    OpenAIRE

    Fino, Anna; Tomassini, Adriano

    2007-01-01

    We construct a compact 6-dimensional solvmanifold endowed with a non-trivial invariant generalized K\\"ahler structure and which does not admit any K\\"ahler metric. This is in contrast with the case of nilmanifolds which cannot admit any invariant generalized K\\"ahler structure unless they are tori.

  2. Non-Kähler solvmanifolds with generalized Kähler structure

    OpenAIRE

    Fino, Anna; Tomassini, Adriano

    2009-01-01

    We construct a compact 6-dimensional solvmanifold endowed with a non-trivial invariant generalized Kähler structure and which does not admit any Kähler metric. This is in contrast with the case of nilmanifolds which cannot admit any invariant generalized Kähler structure unless they are tori.

  3. Phase-space dynamics of Bianchi IX cosmological models

    International Nuclear Information System (INIS)

    The complex phase-space dynamical behaviour of a class of Biachi IX cosmological models is discussed, as the chaotic gravitational collapse due Poincare's homoclinic phenomena, and the n-furcation of periodic orbits and tori in the phase space of the models. Poincare maps which show this behaviour are constructed merically and applications are discussed. (Author)

  4. Fast iteration of cocyles over rotations and Computation of hyperbolic bundles

    CERN Document Server

    Huguet, Gemma; Sire, Yannick

    2011-01-01

    In this paper, we develop numerical algorithms that use small requirements of storage and operations for the computation of hyperbolic cocycles over a rotation. We present fast algorithms for the iteration of the quasi-periodic cocycles and the computation of the invariant bundles, which is a preliminary step for the computation of invariant whiskered tori.

  5. Different in vitro proliferation and cytokine-production inhibition of memory T-cell subsets after calcineurin and mammalian target of rapamycin inhibitors treatment.

    Science.gov (United States)

    Merino, David; San Segundo, David; Medina, Juan M; Rodrigo, Emilio; Asensio, Esther; Irure, Juan; Fernández-Fresnedo, Gema; Arias, Manuel A; López-Hoyos, Marcos

    2016-06-01

    Calcineurin inhibitors (CNI) and mammalian target of rapamycin inhibitors (mTORi) are the main immunosuppressants used for long-term maintenance therapy in transplant recipients to avoid acute rejection episodes. Both groups of immunosuppressants have wide effects and are focused against the T cells, although different impacts on specific T-cell subsets, such as regulatory T cells, have been demonstrated. A greater knowledge of the impact of immunosuppression on the cellular components involved in allograft rejection could facilitate decisions for individualized immunosuppression when an acute rejection event is suspected. Memory T cells have recently gained focus because they might induce a more potent response compared with naive cells. The impact of immunosuppressants on different memory T-cell subsets remains unclear. In the present study, we have studied the specific impact of CNI (tacrolimus) and mTORi (rapamycin and everolimus) over memory and naive CD4(+) T cells. To do so, we have analysed the proliferation, phenotypic changes and cytokine synthesis in vitro in the presence of these immunosuppressants. The present work shows a more potent effect of CNI on proliferation and cytokine production in naive and memory T cells. However, the mTORi permit the differentiation of naive T cells to the memory phenotype and allow the production of interleukin-2. Taken together, our data show evidence to support the combined use of CNI and mTORi in transplant immunosuppression. PMID:26931075

  6. Ontario's Challenge: Denominational Rights in Public Education

    Science.gov (United States)

    Zinga, Dawn

    2008-01-01

    Denominational rights in education have a long and controversial history within Canada. Ontario has struggled with denomination rights and continues to face the challenges posed by accommodating denominational rights. This paper examines those challenges and considers the future of denominational rights in Ontario, in light of John Tory's 2007…

  7. Tõuloom 2012 / Krista Sepp

    Index Scriptorium Estoniae

    Sepp, Krista

    2012-01-01

    Eesti Tõuloomakasvatuse Liidu poolt Ülenurme Põllumajandusmuuseumis 1. septembril korraldatud tõuloomade konkursil Tartu sügisnäitus. Tõuloom 2012 tunnustatud Eesti Hobusekasvatajate Seltsi liikmetest ning trakeeni, araabia tori, eesti ja eesti raskeveo tõugu hobustest

  8. Reducing multiphoton ionization in a linearly polarized microwave field by local control

    OpenAIRE

    Huang, S.; Chandre, C; Uzer, T.

    2006-01-01

    We present a control procedure to reduce the stochastic ionization of hydrogen atom in a strong microwave field by adding to the original Hamiltonian a comparatively small control term which might consist of an additional set of microwave fields. This modification restores select invariant tori in the dynamics and prevents ionization. We demonstrate the procedure on the one-dimensional model of microwave ionization.

  9. "The Alternative of Williamsburg": A British Cartoon on Colonial American Violence.

    Science.gov (United States)

    Harper, John; And Others

    1996-01-01

    Utilizes a 1775 political cartoon as the centerpiece of a lesson on political controversy and violence in Colonial America. The cartoon, printed in Britain, lampooned the coercive measures directed at Tory merchants. Learning activities include an extensive analysis of the cartoon, discussions, and timelines. (MJP)

  10. OCT4: Less is more

    Institute of Scientific and Technical Information of China (English)

    Ryan T Wagner; Austin J Cooney

    2009-01-01

    @@ Embryonic Stem Cells (ES cells) exhibit vast potential that is just begin-ning to be realized with regard to both clinical therapies, and use in the labora-tory as a model system for the study of development and cancer progression.

  11. Pop / Tõnis Kahu

    Index Scriptorium Estoniae

    Kahu, Tõnis, 1962-

    2005-01-01

    Heliplaatidest: Tori Amos "The Beekeeper", 3 Doors Down "Seventeen Days", Jay-Z / Linkin Park "Collision Course", Patrick Moraz / Bill Bruford "Flags", Shuttle358 "Chessa", Erasure "Nightbird", Erinevad esitajad "Kingston 5 Presents The New Sound of Reggae", Ryuichi Sakamoto "Chasm", Ryuichi Sakamoto "Derrida"

  12. Drug: D05366 [KEGG MEDICUS

    Lifescience Database Archive (English)

    Full Text Available TORY SYSTEM R03 DRUGS FOR OBSTRUCTIVE AIRWAY DISEASES R03A ADRENERGICS, INHALANTS R03AC Selective beta-2-adr...JP16) R03C ADRENERGICS FOR SYSTEMIC USE R03CC Selective beta-2-adrenoreceptor agonists R03CC08 Procaterol D0

  13. Mahler Measure, Eisenstein Series and Dimers

    NARCIS (Netherlands)

    Stienstra, J.

    2007-01-01

    This note reveals a mysterious link between the partition function of certain dimer models on 2-dimensional tori and the L-function of their spectral curves. It also relates the partition function in certain families of dimer models to Eisenstein series. http://www.arxiv.org/abs/math.NT/0502197

  14. Research using small tokamaks

    International Nuclear Information System (INIS)

    This document consists of a collection of papers presented at the IAEA Technical Committee Meeting on Research Using Small Tokamaks. It contains 22 papers on a wide variety of research aspects, including diagnostics, design, transport, equilibrium, stability, and confinement. Some of these papers are devoted to other concepts (stellarators, compact tori). Refs, figs and tabs

  15. On Hierarchical Extensions of Large-Scale 4-regular Grid Network Structures

    DEFF Research Database (Denmark)

    Pedersen, Jens Myrup; Patel, A.; Knudsen, Thomas Phillip; Madsen, Ole Brun

    It is studied how the introduction of ordered hierarchies in 4-regular grid network structures decreases distances remarkably, while at the same time allowing for simple topological routing schemes. Both meshes and tori are considered; in both cases non-hierarchical structures have power law...

  16. The Topology of Knight's Tours on Surfaces

    OpenAIRE

    Forrest, Bradley; Teehan, Kara

    2015-01-01

    We investigate the homotopy classes of closed knight's tours on cylinders and tori. Specifically, we characterize the dimensions of cylindrical chessboards that admit closed knight's tours realizing the identity of the fundamental group and those that admit closed tours realizing a generator of the fundamental group. We also produce analogous results for toroidal chessboards.

  17. International Atomic Energy Agency Technical Committee Meeting, Innovative approaches to fusion energy, Pleasanton, CA, October 20-23, 1997

    International Nuclear Information System (INIS)

    The Purpose of this Meeting is to provide a forum for discussion of approaches to fusion other than conventional tokamaks and stellarators, such as: (1) quasi-steady-state systems (mirrors, RFP's, spheromaks, FRC'S, spherical tori,...); (2) short-pulsed systems (liners, Z-pinch variants, plasma foci, novel ICF, ...); and (3) fusion technology innovations

  18. Interstitial pneumonitis caused by everolimus : a case-cohort study in renal transplant recipients

    NARCIS (Netherlands)

    Baas, Marije C.; Struijk, Geertrude H.; Moes, Dirk-Jan A. R.; van den Berk, Inge A. H.; Jonkers, Rene E.; de Fijter, Johan W.; van der Heide, Jaap J. Homan; van Dijk, Marja; ten Berge, Ineke J. M.; Bemelman, Frederike J.

    2014-01-01

    The use of inhibitors of the mammalian target of rapamycin (mTORi) in renal transplantation is associated with many side effects, the potentially most severe being interstitial pneumonitis. Several papers have reported on sirolimus-induced pneumonitis, but less is published on everolimus-induced pne

  19. Topological effects on string vacua

    International Nuclear Information System (INIS)

    We review some topological effects on the construction of string flux-vacua. Specifically we study the effects of brane-flux transitions on the stability of D-branes on a generalized tori compactification, the transition that a black hole suffers in a background threaded with fluxes and the connections among some Minkowsky vacua solutions.

  20. Drug: D07493 [KEGG MEDICUS

    Lifescience Database Archive (English)

    Full Text Available TORY SYSTEM R06 ANTIHISTAMINES FOR SYSTEMIC USE R06A ANTIHISTAMINES FOR SYSTEMIC USE R06AX Other antihista...mines for systemic use R06AX01 Bamipine D07493 Bamipine lactate Target-based classi

  1. Status Quo of Drug Supervision in China(Part Ⅱ)

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    @@ Ⅲ. Policies and Measures Concerning Drug Safety SupervisionBased on its national conditions and learning from international advanced ex-perience, China has formulated policies and measures concerning the improve-merit of drug safety, effectiveness and quality control, and established a regula-tory system covering research, produc-tion, distribution and use of drugs.

  2. Tõmbed ja tõukumised / Aita Kivi

    Index Scriptorium Estoniae

    Kivi, Aita, 1954-

    2001-01-01

    Sisu : Margaret Atwood. Pime palgamõrvar; Sebastian Faulks. Charlotte Gray; Peter Carey. Oscar ja Lucinda; Kurt Vonnegut. Sinihabe; Aita Kivi. Jumalakäpp; Aita Kivi. Lummus; Raymond Radiguet. Saatan ihus; Wendu Northcutt. Darwini auhinnad; Merike Hanni. Ümberõpe; Merike Hanni. Tori hobune; Friedrich Schiller. Maria Stuart

  3. cDNA: 51322 [

    Lifescience Database Archive (English)

    Full Text Available M. musculus - Mm.246203 Mus musculus similar to mitogen-activated protein kinase 14 isoform 1; c ... tory drug binding protein; Csaids binding protein; MAP ... kinase Mxi2; p38 mitogen activated protein kinase; ... p38 MAP ... kinase; p38alpha Exip; stress-a ... gnl|UG|Mm#S175 ...

  4. Locus: 8901 [

    Lifescience Database Archive (English)

    Full Text Available Mm.246203 M. musculus - S: gi|38049477|ref|NT_039548.2|Mm12_39588_32 NT_039548 Mus musculus simi ... tory drug binding protein; Csaids binding protein; MAP ... kinase Mxi2; p38 mitogen activated protein kinase; ... p38 MAP ... kinase; p38alpha Exip; stress-a ... Alt. poly(A) 1 ...

  5. Real determinant line bundles

    CERN Document Server

    Okonek, Christian

    2011-01-01

    This article is an expanded version of the talk given by Ch. O. at the Second Latin Congress on "Symmetries in Geometry and Physics" in Curitiba, Brazil in December 2010. In this version we explain the topological and gauge-theoretical aspects of our paper "Abelian Yang-Mills theory on Real tori and Theta divisors of Klein surfaces".

  6. mTOR inhibitor-induced interstitial lung disease in cancer patients: Comprehensive review and a practical management algorithm.

    Science.gov (United States)

    Willemsen, Annelieke E C A B; Grutters, Jan C; Gerritsen, Winald R; van Erp, Nielka P; van Herpen, Carla M L; Tol, Jolien

    2016-05-15

    Mammalian target of rapamycin inhibitors (mTORi) have clinically significant activity against various malignancies, such as renal cell carcinoma and breast cancer, but their use can be complicated by several toxicities. Interstitial lung disease (ILD) is an adverse event of particular importance. Mostly, mTORi-induced ILD remains asymptomatic or mildly symptomatic, but it can also lead to severe morbidity and even mortality. Therefore, careful diagnosis and management of ILD is warranted. The reported incidence of mTORi-induced ILD varies widely because of a lack of uniform diagnostic criteria and active surveillance. Because of the nonspecific clinical features, a broad differential diagnosis that includes (opportunistic) infections should be considered in case of suspicion of mTORi-induced ILD. The exact mechanism or interplay of mechanisms leading to the development of ILD remains to be defined. Suggested mechanisms are either a direct toxic effect or immune-mediated mechanisms, considering mTOR inhibitors have several effects on the immune system. The clinical course of ILD varies widely and is difficult to predict. Consequently, the discrimination between when mTOR inhibitors can be continued safely and when discontinuation is indicated is challenging. In this review, we give a comprehensive review of the incidence, clinical presentation and pathophysiology of mTORi-induced ILD in cancer patients. We present newly developed diagnostic criteria for ILD, which include clinical symptoms as well as basic pulmonary function tests and radiological abnormalities. In conjunction with these diagnostic criteria, we provide a detailed and easily applicable clinical management algorithm. PMID:26452336

  7. EBT-P gamma-ray shielding system

    Energy Technology Data Exchange (ETDEWEB)

    Gohar, Y.

    1981-12-01

    An elaborate study was carried out for the coil and biological shield of the ELMO Bumpy Torus proof-of-principle (EBT-P) device. A three-dimensional scoping study for the coil shield was performed for four different shielding options to define the heat load for each component and check the compliance with the design criterion of 10 watts maximum heat per coil from the gamma ray sources. Also, a detailed biological dose survey was performed which included: (a) the dose equivalent inside and outside the building, (b) the dose equivalent from the two mazes of the machine room, and (c) the skyshine contribution to the dose equivalent.

  8. EBT-P gamma-ray shielding system

    International Nuclear Information System (INIS)

    An elaborate study was carried out for the coil and biological shield of the ELMO Bumpy Torus proof-of-principle (EBT-P) device. A three-dimensional scoping study for the coil shield was performed for four different shielding options to define the heat load for each component and check the compliance with the design criterion of 10 watts maximum heat per coil from the gamma ray sources. Also, a detailed biological dose survey was performed which included: (a) the dose equivalent inside and outside the building, (b) the dose equivalent from the two mazes of the machine room, and (c) the skyshine contribution to the dose equivalent

  9. Determination of nonaxisymmetric equilibrium

    International Nuclear Information System (INIS)

    The Princeton Equilibrium Code is modified to determine the equilibrium surfaces for a large aspect ratio toroidal system with helical magnetic fields. The code may easily be made to include any variety of modes. Verification of the code is made by comparison with an analytic solution for l = 3. Previously observed shifting of the magnetic axis with increasing pressure or with a changed externally applied vertical field is obtained. The case l = 0, a bumpy torus, gives convergence only for the lenient convergence tolerance of epsilon/sub b/ = 1.0 x 10-2

  10. Theoretical prediction of bootstrap current in the large helical device with unbalanced helical coil currents

    International Nuclear Information System (INIS)

    The Large Helical Device (LHD), which is a heliotron/torsatron device with two helical coils, is designed so that the current in each helical coil can be controlled independently. Unbalancing these currents leads to spatial axis configurations. The bootstrap current is found to be strongly affected by any imbalance between these currents. When the ratio of the currents in the two helical coils is small enough, a bootstrap current flows in a direction so as to decrease the rotational transform because of the enhancement of the bumpiness component of the magnetic field as well as of the spatial axis component. This leads to improved stability. (author). 17 refs, 9 figs

  11. Fluctuation of the Initial Conditions and its Consequences on some Observables

    International Nuclear Information System (INIS)

    We show effects of the event-by-event fluctuation of the initial conditions (IC) in hydrodynamic description of high-energy nuclear collisions on some observables. Such IC produce not only fluctuations in observables but, due to their bumpy structure, several non-trivial effects appear. They enhance production of isotropically distributed high-pT particles, making v2 smaller there. Also, they reduce v2 in the forward and backward regions where the global matter density is smaller, so where such effects become more efficacious. They may also produce the so-called ridge effect in the two large-pT particle correlation. (author)

  12. Data format translation routines

    International Nuclear Information System (INIS)

    To enable the effective connection of several dissimilar computers into a network, modification of the data being passed from one computer to another may become necessary. This document describes a package of routines which permit the translation of data in PDP-8 formats to PDP-11 or DECsystem-10 formats or from PDP-11 format to DECsystem-10 format. Additional routines are described which permit the effective use of the translation routines in the environment of the Fusion Energy Division (FED) network and the Elmo Bumpy Torus (EBT) data base

  13. Data format translation routines

    Energy Technology Data Exchange (ETDEWEB)

    Burris, R.D.

    1981-02-01

    To enable the effective connection of several dissimilar computers into a network, modification of the data being passed from one computer to another may become necessary. This document describes a package of routines which permit the translation of data in PDP-8 formats to PDP-11 or DECsystem-10 formats or from PDP-11 format to DECsystem-10 format. Additional routines are described which permit the effective use of the translation routines in the environment of the Fusion Energy Division (FED) network and the Elmo Bumpy Torus (EBT) data base.

  14. Advanced fusion concepts program

    International Nuclear Information System (INIS)

    While the prospects for the eventual development of a tokamak-based fusion reactor appear promising at the present time, the Department of Energy maintains a vigorous program in alternate magnetic fusion concepts. Several of the concepts presently supported include the toroidal reversed field pinch, Tormac, Elmo Bumpy Torus, and various linear options. Recent technical accomplishments and program evaluations indicate that the possibility now exists for undertaking the next development stage, a proof-of-principle experiment, for a few of the most promising alternate concepts

  15. MARKET WATCH

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    The World Bank forecasts a rosy prospect for the Chinese economy,despite a moderate slowdown in growth.The real estate market continues to cool,with an increasing number of cities experiencing price declines.China’s state-owned enterprises face a bumpy road ahead,with their profits shrinking quickly.The shipping giant COSCO is swimming in red ink due to tepid demands and overcapacity.China is expected to replace the United States as the world’s top e-commerce market by 2015.

  16. Skin Firming, Skin Smoothing, Skin Blemishes Elimination and Anti-aging Effects of Increased Protein Intake in the Form of Voandzeia hypogeal Seed Meal

    OpenAIRE

    Utoh-Nedosa U. Anastasia

    2011-01-01

    Studies on the effect of excess calorie intake on the human body showed that it resulted in accumulation of excess body fat; the darkening of the skin colour and the development of a bumpy skin. Problem statement: The present study investigated the effects of increased protein intake on the human skin and on body fat. The skin firming, skin smoothing and skin colour lightening effects of Vernonia amygdalina leaf extract has already been established. The anti-obesity, body calming and anti-agi...

  17. MARKET WATCH

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    In an attempt to boost liquidity, China’s central bank decreases the reserve requirement ratio for the first time in three years. The November purchasing managers index tumbles below the boom-and-bust line of 50 percent, indicating downside growth risks. As they tighten delisting rules on the growth enterprise board, China’s securities regulator tries to protect interests of investors. The Ministry of Commerce has released a development outline for the service trade sector. Chinese shipbuilders face a bumpy road ahead due to weakness in demand. Credit card fever is sweeping through the country, though debt risks still loom large.

  18. Multi-disciplinary Real Estate Education: A Comparison of a US and European approach.

    OpenAIRE

    McFarland, M.; H. Lavasani

    2015-01-01

    Real Estate education in the US at the graduate level has has a 'bumpy' time in US academic institutions. Up until the year 2000 or so, most real estate was taught, if at all, in business schools as a finance/valuation proposition. There was little or no bow to the Graaskamp model of multi- and inter-disciplinary curriculum in recognition of the diverse disciplines that impact real estate and hence the need for a curriculum to match. In 2006 when the University of Maryland established it's Ma...

  19. Review of recent EBT coupled ring-core stability theory

    International Nuclear Information System (INIS)

    During the past several years Elmo Bumpy Torus (EBT) stability calculations have evolved with respect to treatment of ring-core plasma coupling effects. This evolution began with recognition of the important role of ring compressibility and paramagnetic effects on core beta limits. Since then, models have continued to increase in sophistication, including ring-core frequency coupling, velocity space and hot electron distribution function effects, and radially dependent models. Some of these features have resulted in wide variations in predicted plasma performance limitations. A number of the models will be reviewed and assumptions to which they are particularly sensitive will be discussed

  20. A simple jaw splint for minimally displaced mandible fractures with undisplaced occlusion

    OpenAIRE

    Hoyt, Benjamin; Lalonde, Don

    2003-01-01

    A 35-year-old patient presented with a minimally displaced jaw fracture with normal occlusion. She was treated conservatively with a soft diet and told to avoid doing things that hurt to prevent movement at the fracture site. She had the most difficulty with pain generated by walking, driving on bumpy roads and waking up with an unfavourable jaw position during her sleep. She created a simple Velcro (Velcro Industries BV, USA) splint, that removed all of her pain with walking, driving and sle...

  1. MARKET WATCH

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    Export deals experience year-on-year increases at the Canton Fair,though uncertainties still linger.Soaring coal prices put cost pressures on thermal power generators.Fierce competition rocks the foundation of China Mobile’s market dominance.Chinese automaker BYD goes on a bumpy ride as its sales go through a free-fall.The Export-Import Bank of China ties up with the Inter-American Development Bank to finance trade between China and Latin America and the Caribbean region.

  2. Atomic physics processes in radial transport calculations

    International Nuclear Information System (INIS)

    These lectures were intended as preparation for detailed discussions of the role of atomic and molecular physics in confinement research at the 1982 NATO Advanced Study Institute. They begin with a description of the major approaches to magnetic confinement: tandem (ambipolar) mirrors with their associated auxiliary barriers, tokamaks, and stellarators. The leading alternatives, the ELMO Bumpy Torus and the reversed field pinch, are also treated. The evolution equations for particle, energy, and (where relevant) field diffusion are presented and discussed. This is the context for atomic and molecular processes relevant to confinement

  3. Alternative lines with magnetic plasma confinement

    International Nuclear Information System (INIS)

    Plasma confinement with the aid of a magnetic field is the most common and also the most frequently investigated principle on the way to controlled nuclear fusion. Apart from the Tokamak principle, which is the most advanced principle as far as fusion-relevant plasma parameters are concerned, also other approaches are being investigated, e.g. the mirror device, the bumpy tons, and the stellarator. In principle, all three concepts permit 'stationary' plasma confinement in a stationary fusion reactor. Compared with the pulsed Tokamak reactor, this is a considerable advantage. (orig./GG)

  4. The NASA-Lewis program on fusion energy for space power and propulsion, 1958-1978

    International Nuclear Information System (INIS)

    An historical synopsis is provided of the NASA-Lewis research program on fusion energy for space power and propulsion systems. It was initiated to explore the potential applications of fusion energy to space power and propulsion systems. Some fusion related accomplishments and program areas covered include: basic research on the Electric Field Bumpy Torus (EFBT) magnetoelectric fusion containment concept, including identification of its radial transport mechanism and confinement time scaling; operation of the Pilot Rig mirror machine, the first superconducting magnet facility to be used in plasma physics or fusion research; operation of the Superconducting Bumpy Torus magnet facility, first used to generate a toroidal magnetic field; steady state production of neutrons from DD reactions; studies of the direct conversion of plasma enthalpy to thrust by a direct fusion rocket via propellant addition and magnetic nozzles; power and propulsion system studies, including D(3)He power balance, neutron shielding, and refrigeration requirements; and development of large volume, high field superconducting and cryogenic magnet technology

  5. Stability of EBT of guiding-centre fluid theory

    International Nuclear Information System (INIS)

    The stability of the hot-electron annulus in the ELMO Bumpy Torus (EBT) is not yet completely understood despite considerable attention. Most stability studies have dealt with localized analysis of simplified models in which the actual magnetic configuration is replaced by a straight-line slab with a gravity to emulate the effects of curvature and gradients in the actual magnetic field. Here, a more realistic geometry, a 'bumpy' cylinder with a 2:1 magnetic mirror ratio, is considered and the response of the hot-electron rings to various non-local perturbations, specifying only the mode number in the ignorable co-ordinate, is examined. Guiding-centre theory (with psub(perpendicular) > psub(parallel)) is used and the second variation in the plasma energy (σW) using a finite-element representation to identify the least stable mode for the plasma is studied. All the equilibria that are examined are found to be unstable for all poloidal mode numbers m>=1, with growth rates increasing with increasing ring beta, plasma beta, and poloidal mode number. It is concluded that two-fluid and/or kinetic effects are required to explain the observed global stability of EBT-I. (author)

  6. Theory of waves, instabilities, and transport in thermonuclear plasmas. Progress report, 1 June 1976--1 December 1977

    International Nuclear Information System (INIS)

    Results are reported in three theoretical areas, plasma heating by radio frequency wave, transport processes in the bumpy torus, and in the magnetohydrodynamic stability of toroidal plasmas. Linear electron cyclotron heating is found to be a very efficient method for heating tokamaks of moderate density. Linear heating is limited to densities such that the plasma frequency at resonance is less than the cyclotron frequency. At higher densities the nonlinear process of frequency doubling with a subsequent parametric decay can be used with high power sources. Some results on a model of Alfven wave heating are presented, useful for scaling laws for the extrapolation of data and prediction of the system behavior in large tokamaks. The work on transport processes in a bumpy torus has been carried to the point where extensive computer calculations are necessary, which will be carried out by the group at ORNL. The transport coefficients have a strong dependence on the ambipolar electric field and plasma collisionality. The work on MHD instabilities has continued. Results are presented for toroidal corrections for ideal MHD

  7. The NASA-Lewis program on fusion energy for space power and propulsion, 1958-1978

    Science.gov (United States)

    Schulze, Norman R.; Roth, J. Reece

    1990-01-01

    An historical synopsis is provided of the NASA-Lewis research program on fusion energy for space power and propulsion systems. It was initiated to explore the potential applications of fusion energy to space power and propulsion systems. Some fusion related accomplishments and program areas covered include: basic research on the Electric Field Bumpy Torus (EFBT) magnetoelectric fusion containment concept, including identification of its radial transport mechanism and confinement time scaling; operation of the Pilot Rig mirror machine, the first superconducting magnet facility to be used in plasma physics or fusion research; operation of the Superconducting Bumpy Torus magnet facility, first used to generate a toroidal magnetic field; steady state production of neutrons from DD reactions; studies of the direct conversion of plasma enthalpy to thrust by a direct fusion rocket via propellant addition and magnetic nozzles; power and propulsion system studies, including D(3)He power balance, neutron shielding, and refrigeration requirements; and development of large volume, high field superconducting and cryogenic magnet technology.

  8. Generation and Stability of Toroidal Droplets in a Viscous Liquid

    Science.gov (United States)

    Pairam, E.; Fernández-Nieves, A.

    2009-06-01

    We use a simple method to generate toroidal droplets and study how they transform into spherical droplets. The method relies on the viscous forces exerted by a rotating continuous phase over a liquid which is extruded from an injection needle; the resultant jet is forced to close into a torus due to the imposed rotation. Once formed, the torus transforms into single or multiple spheres. Interestingly, we find there are two routes for this process depending on the aspect ratio of the torus. For thin tori, classical hydrodynamic instabilities induce its breakup into a precise number of droplets. By contrast, for sufficiently fat tori, unstable modes are unable to grow, and the torus evolves through a different route; it shrinks towards its center to coalesce onto itself, to finally form a single spherical droplet.

  9. Preparation of new morphological ZnO and Ce-doped ZnO

    Energy Technology Data Exchange (ETDEWEB)

    Chelouche, A.; Djouadi, D.; Aksas, A. [Laboratoire de Génie de l' Environnement, Université A. Mira de Béjaia, Route de Targua Ouzemmour Béjaia (Algeria)

    2013-12-16

    ZnO micro-tori and cerium doped hexangulars ZnO have been prepared by the sol-gel method under methanol hypercritical conditions of temperature and pressure. X-ray diffraction (XRD) measurement has revealed the high crystalline quality and the nanometric size of the samples. Scanning electron microscopy (SEM) has shown that the ZnO powder has a torus-like shape while that of ZnO:Ce has a hexangular-like shape, either standing free or inserted into the cores of ZnO tori. Transmission electron microscopy (TEM) has revealed that the ZnO particles have sizes between 25 and 30 nm while Ce-doped ZnO grains have diameters ranging from 75 nm to 100 nm. Photoluminescence spectra at room temperature of the samples have revealed that the introduction of cerium in ZnO reduces the emission intensity lines, particularly the ZnO red and green ones.

  10. Microstructures and Corrosion Resistance of Al2O3—C Based Refractories to the Melts Containing Titania

    Institute of Scientific and Technical Information of China (English)

    LIUQingai; W.Newkirk; 等

    2002-01-01

    The corrosion resisance of the Al2O3-C based refrac-tories in melts containing titania has been studied by quasi-station immersion and rotary immersionThe corrosion rate is decreased with the addition of graphite carbon and ZrO2 in the refractories.The corrosion mehanism of Al2O3-C refractories is the oxidization of graphite carbon by the oxides of the melts and the formation of deteriorate layer,For the Al2O3-C-ZrO2 refractories,the corrosion behavior is due to the interaction between melts and refrac-tories,The new compounds of FeO.SiO2,SiZrO4,Feo.3CaO,2CaO.SiO2 and CaO.SiO2 are formed in the deteriorate layer.

  11. Systèmes dynamiques algébriquement complètement intégrables et géométrie

    Directory of Open Access Journals (Sweden)

    Lesfari A.

    2015-07-01

    Full Text Available In this paper I present the basic ideas and properties of the complex algebraic completely integrable dynamical systems. These are integrable systems whose trajectories are straight line motions on complex algebraic tori (abelian varieties. We make, via the Kowalewski-Painlevé analysis, a detailed study of the level manifolds of the system. These manifolds are described explicitly as being affine part of complex algebraic tori and the flow can be solved by quadrature, that is to say their solutions can be expressed in terms of abelian integrals. The Adler-van Moerbeke method’s which will be used is primarily analytical but heavily inspired by algebraic geometrical methods. We will also discuss several examples of algebraic completely integrable systems : Kowalewski’s top, geodesic flow on SO(4, Hénon-Heiles system, Garnier potential, two coupled nonlinear Schrödinger equations and Yang-Mills system.

  12. Perturbative series expansions theoretical aspects and numerical investigations

    CERN Document Server

    Biasco, L

    2004-01-01

    Perturbation theory is introduced by means of models borrowed from Celestial Mechanics, namely the two-body and three-body problems. Such models allow to introduce in a simple way the concepts of integrable and nearly-integrable systems, which can be conveniently investigated using Hamiltonian formalism. After discussing the problem of the convergence of the Lindstedt series, we introduce the basic notions of KAM theory, which allows (under quite general assumptions) to state the persistence of invariant tori. The value at which such surfaces break-down can be determined by means of numerical algorithms. Among the others, we review three methods to which we refer as Greene, Pade' and Lyapunov. We present some concrete applications to discrete models of the three different techniques, in order to provide complementary information about the break-down of invariant tori.

  13. CTR plasma engineering studies. Annual progress report, 1 October 1979--30 September 1080

    International Nuclear Information System (INIS)

    FY 1980 CTR Plasma Engineering Studies performed at the University of Illinois are reported. Current studies concentrated on four major areas including (i) field-reversed mirror (FRM) and related compact tori, (ii) dynamic behavior of the reversed-field pinch (RFP) including transport and stability and start-up, (iii) plasma buildup in small mirrors by including finite, ion orbit effects as well as the drift cyclotron loss-cone velocity-space diffusion, and (iv) high-energy fusion product transport in non-circular and high-β tokamaks, alpha ash buildup and possible control in tokamaks. Various computer packages have been produced for FRM, FROP, RFP, small compact tori and non-circular tokamaks. Basic models and the code packages developed and tested with available experiments are of vital information that can be used in conceptual reactor studies for the scaling and prediction of plasma behavior in near-term reactors

  14. Trasformace integrálů pomocí vektorových operátorů

    OpenAIRE

    Joch, Lukáš

    2008-01-01

    Tato bakalářská práce se zabývá vektorovými operátory, kteří hrají podstatnou roli v matematickém zápisu fyzikálních dějů. Cílem této práce je seznámit čtenáře s jednotlivými vektorovými operátory a nastínit mu jejich využití ve fyzice. Práce si dále klade za cíl definovat jednotlivé integrální věty, tj. Gaussovu-Ostrogradského větu, Greenovu větu a Stokesovu větu.

  15. Preparation of new morphological ZnO and Ce-doped ZnO

    International Nuclear Information System (INIS)

    ZnO micro-tori and cerium doped hexangulars ZnO have been prepared by the sol-gel method under methanol hypercritical conditions of temperature and pressure. X-ray diffraction (XRD) measurement has revealed the high crystalline quality and the nanometric size of the samples. Scanning electron microscopy (SEM) has shown that the ZnO powder has a torus-like shape while that of ZnO:Ce has a hexangular-like shape, either standing free or inserted into the cores of ZnO tori. Transmission electron microscopy (TEM) has revealed that the ZnO particles have sizes between 25 and 30 nm while Ce-doped ZnO grains have diameters ranging from 75 nm to 100 nm. Photoluminescence spectra at room temperature of the samples have revealed that the introduction of cerium in ZnO reduces the emission intensity lines, particularly the ZnO red and green ones

  16. Monitoring kvality elektrické energie v distribučních systémech

    OpenAIRE

    Kostelník, Adam

    2011-01-01

    Semestrální projekt vysvětluje pojem kvalita elektrické energie, popisuje její charakteristiky a vlastnosti definované normami. Dále se zaobírá měřením kvality elektrické energie a také analyzátory, které jsou k tomu určeny. Následně se zaměřuje na používanou datovou komunikaci pro přenos naměřených dat mezi analyzátory a sběrnými místy. V závěru jsou stručně popsány základní vlastnosti dvou vybraných analyzátorů pro realizaci praktického měření.

  17. Behaviorism vs connectivism:The contribution of IT environments for human learning in France

    OpenAIRE

    David, Claire

    2015-01-01

    In the following, we study the contribution of information technology (IT) environments on hu-man learning in France. SPOCs, MOOCs appear as the initial knowledge vectors. The introduction of personalized courses proves a must. Interactivity plays a major role as concerns the consolidation of knowledge. The use of scripts allows to take into account interdisciplinary links, and enable one to introduce concrete contexts of application. Finally, serious games, combining visual stress, audi-tory...

  18. Cherish Life

    Institute of Scientific and Technical Information of China (English)

    ZHANG ZHIPING

    2010-01-01

    @@ After a 200-hour ordeal, 115 survivors were successfully rescued from the flooded Wangjialing Coal Mine. This is a miracle in the his-tory of Chinese mining rescues. Eight days ago, surging underground water trapped 153 workers in the mine. As in many other Chinese coal mines, workers in the Wangjialing Coal Mine come from China's poorer areas, and income from the mine is usually the main source of income for the families of these workers.

  19. Simple Robust Method for Quasi-Confirmatory Factor Analysis (Three Examples)

    OpenAIRE

    Sindik, Joško

    2013-01-01

    In this article we present a simple robust method named Quasi-Confirmatory Factor Analysis (QCFA), with the pur- pose of comparing two factor structures, obtained by using exploratory factor analysis (EFA). EFA and CFA (confirma- tory factor analysis) approaches, together with other methods that are used in this field, are often used simultaneously in cross-cultural research in testing the possibility of generalizing imported theoretical constructs on different sample of subjects. In the disc...

  20. Towards Kaluza-Klein Dark Matter on Nilmanifolds

    CERN Document Server

    Andriot, David; Deandrea, Aldo; Deutschmann, Nicolas; Tsimpis, Dimitrios

    2016-01-01

    We present a first study of the field spectrum on a class of negatively-curved compact spaces: nilmanifolds or twisted tori. This is a case where analytical results can be obtained, allowing to check numerical methods. We focus on the Kaluza-Klein expansion of a scalar field. The results are then applied to a toy model where a natural Dark Matter candidate arises as a stable massive state of the bulk scalar.

  1. Towards Kaluza-Klein Dark Matter on nilmanifolds

    Science.gov (United States)

    Andriot, David; Cacciapaglia, Giacomo; Deandrea, Aldo; Deutschmann, Nicolas; Tsimpis, Dimitrios

    2016-06-01

    We present a first study of the field spectrum on a class of negatively-curved compact spaces: nilmanifolds or twisted tori. This is a case where analytical results can be obtained, allowing to check numerical methods. We focus on the Kaluza-Klein expansion of a scalar field. The results are then applied to a toy model where a natural Dark Matter candidate arises as a stable massive state of the bulk scalar.

  2. Life Cycle Assessment (LCA) in Forestry – State and Perspectives

    OpenAIRE

    Heinimann, Hans Rudolf

    2012-01-01

    Environmentally sound technologies are a key to reduce resource use and environmental impact. The paper reviews the state of knowledge of an analysis tool, life cycle assessment (LCA), by addressing three issues: 1) methodological foundations of LCA, 2) lifecycle inven­tory modeling, and 3) environmental performance indicators for wood supply systems. The study results in the following findings: 1) LCA is still not widely used and accepted in the forest operations engineering. 2) Only a few s...

  3. Roots of a compact Lie group

    CERN Document Server

    Tapp, Kristopher

    2009-01-01

    This expository article introduces the topic of roots in a compact Lie group. Compared to the many other treatments of this standard topic, I intended for mine to be relatively elementary, example-driven, and free of unnecessary abstractions. Some familiarity with matrix groups and with maximal tori is assumed. This article is self-contained, but is also intended to serve as a supplemental 10th chapter of an eventual new edition of my textbook, ``Matrix Groups for Undergraduates.''

  4. Closure of an Upper Middline Diastema. A Case Treated Using a Multidisciplinary Approach

    OpenAIRE

    Boris Abel González Arocha; Kirenia Pieri Silva; Bárbara Ledesma Cañellas

    2015-01-01

    Dental and maxillofacial abnormalities constitute an oral health problem that has increased in recent decades. Identification and treatment of their causative factors in early ages represent a challenge for dentists and especially orthodontists. The case of 39-year-old patient who attended consultation due to an upper midline diastema of 9mm is presented. On clinical examination, periodontal disease, occlusal abnormalities, exostoses and mandibular tori were found. She was referred to the mul...

  5. Coalescence of magnetic islands forming in a neutral current sheet

    International Nuclear Information System (INIS)

    A neutral current sheet undergoes a tearing instability leading to the formation of magnetic islands. Coalescence of these islands explains the disruptive instability of tokamaks and energy release of solar flares. A criterion was obtained experimentally for coalescence of magnetic islands formed in a theta-pinch current with opposite magnetic fields. The nonlinear stage of the reconnection process leads to the formation of 'compact tori' configurations. Some consequences in flare dynamics are discussed. (D.Gy.)

  6. Higher genus characters for vertex operator superalgebras on sewn Riemann surfaces

    OpenAIRE

    Alexander Zuevsky

    2013-01-01

    We review our recent results on computation of the higher genus characters for vertex operator superalgebras modules. The vertex operator formal parameters are associated to local parameters on Riemann surfaces formed in one of two schemes of (self- or tori- ) sewing of lower genus Riemann surfaces. For the free fermion vertex operator superalgebra we present a closed formula for the genus two continuous orbifold partition functions (in either sewings) in terms of an in...

  7. A simple spatiotemporal chaotic Lotka-Volterra model

    Energy Technology Data Exchange (ETDEWEB)

    Sprott, J.C. [Department of Physics, University of Wisconsin, 1150 University Avenue, Madison, WI 53706 (United States)] e-mail: sprott@physics.wisc.edu; Wildenberg, J.C. [Department of Physics, University of Wisconsin, 1150 University Avenue, Madison, WI 53706 (United States)] e-mail: jcwildenberg@wisc.edu; Azizi, Yousef [Institute for Advanced Studies in Basic Sciences, Zanjan (Iran, Islamic Republic of)] e-mail: joseph_azizi@yahoo.com

    2005-11-01

    A mathematically simple example of a high-dimensional (many-species) Lotka-Volterra model that exhibits spatiotemporal chaos in one spatial dimension is described. The model consists of a closed ring of identical agents, each competing for fixed finite resources with two of its four nearest neighbors. The model is prototypical of more complicated models in its quasiperiodic route to chaos (including attracting 3-tori), bifurcations, spontaneous symmetry breaking, and spatial pattern formation.

  8. General Relativistic Radiative Transfer: Applications to Black-Hole Systems

    Science.gov (United States)

    Wu, Kinwah; Fuerst, Steven V.; Mizuno, Yosuke; Nishikawa, Ken-Ichi; Branduardi-Raymont, Graziella; Lee, Khee-Gan

    2007-01-01

    We present general relativistic radiation transfer formulations which include opacity effects due to absorption, emission and scattering explicitly. We consider a moment expansions for the transfer in the presence of scattering. The formulation is applied to calculation emissions from accretion and outflows in black-hole systems. Cases with thin accretion disks and accretion tori are considered. Effects, such as emission anisotropy, non-stationary flows and geometrical self-occultation are investigated. Polarisation transfer in curved space-time is discussed qualitatively.

  9. Jet and Torus Orientations in High Redshift Radio Galaxies

    OpenAIRE

    Drouart, G.; De Breuck, C.; Vernet, J.; Laing, R. A.; Seymour, N; Stern, D; de Haas, M.; Pier, E. A.; Rocca-Volmerange, B.

    2012-01-01

    We examine the relative orientation of radio jets and dusty tori surrounding the AGN in powerful radio galaxies at z > 1. The radio core dominance R = P(20 GHz) /P(500 MHz) serves as an orientation indicator, measuring the ratio between the anisotropic Doppler-beamed core extended core emission and the isotropic lobe emission. Assuming a fixed cylindrical geometry for the hot, dusty torus, we derive its inclination i by fitting optically-thick radiative transfer models to spectral energy dist...

  10. Viscosity of Quantum Hall Fluids

    OpenAIRE

    Avron, J. E.; Seiler, R.; Zograf, P. G.

    1995-01-01

    The viscosity of quantum fluids with an energy gap at zero temperature is non-dissipative and is related to the adiabatic curvature on the space of flat background metrics (which plays the role of the parameter space). For a quantum Hall fluid on two dimensional tori this viscosity is computed. In this case the average viscosity is quantized and is proportional to the total magnetic flux through the torus.

  11. Research in accelerator physics (theory)

    International Nuclear Information System (INIS)

    This report discusses: Arnold diffusion; recurrence of KAM Tori; Beam-beam Interaction; Isolated Difference Resonances and Particle Distribution; correction schemes of Nonlinear Effects; analysis of E778 Data: resonances in two-degrees-of-freedom; optimization of Linac Injector System; low energy Transport Helical Electrostatic Quadrupoles; Space Charge Problems in Low-Energy Booster Synchrotrons; development of improved beam dynamics treatment for Compact Synchrotrons; operation of Tevatron near Integer Tunes. LSP

  12. X-Ray Absorption, Nuclear Infrared Emission, and Dust Covering Factors of AGNs: Testing Unification Schemes

    Science.gov (United States)

    Mateos, S.; Carrera, F. J.; Alonso-Herrero, A.; Hernán-Caballero, A.; Barcons, X.; Asensio Ramos, A.; Watson, M. G.; Blain, A.; Caccianiga, A.; Ballo, L.; Braito, V.; Ramos Almeida, C.

    2016-03-01

    We present the distributions of the geometrical covering factors of the dusty tori (f2) of active galactic nuclei (AGNs) using an X-ray selected complete sample of 227 AGNs drawn from the Bright Ultra-hard XMM-Newton Survey. The AGNs have z from 0.05 to 1.7, 2-10 keV luminosities between 1042 and 1046 erg s-1, and Compton-thin X-ray absorption. Employing data from UKIDSS, 2MASS, and the Wide-field Infrared Survey Explorer in a previous work, we determined the rest-frame 1-20 μm continuum emission from the torus, which we model here with the clumpy torus models of Nenkova et al. Optically classified type 1 and type 2 AGNs are intrinsically different, with type 2 AGNs having, on average, tori with higher f2 than type 1 AGNs. Nevertheless, ˜20% of type 1 AGNs have tori with large covering factors, while ˜23%-28% of type 2 AGNs have tori with small covering factors. Low f2 are preferred at high AGN luminosities, as postulated by simple receding torus models, although for type 2 AGNs the effect is certainly small. f2 increases with the X-ray column density, which implies that dust extinction and X-ray absorption take place in material that share an overall geometry and most likely belong to the same structure, the putative torus. Based on our results, the viewing angle, AGN luminosity, and also f2 determine the optical appearance of an AGN and control the shape of the rest-frame ˜1-20 μm nuclear continuum emission. Thus, the torus geometrical covering factor is a key ingredient of unification schemes.

  13. Gravitational Waves from a Pseudo-Newtonian Kerr Field with Halos

    Institute of Scientific and Technical Information of China (English)

    王颖; 伍歆

    2011-01-01

    A close relation between gravitational waveforms and the types of trajectories in a superposed field between a pseudo-Newtonian Kerr black hole and quadrupolar halos is shown in detail The gravitational waveforms emitted from circular, KAM tori and chaotic orbits must be periodic, quasiperiodic and stochastic, respectively. The chaotic motion can maximally enhance both the amplitudes and the energy emission rates of the waves.

  14. General-relativistic rotation laws in rotating fluid bodies: constant linear velocity

    CERN Document Server

    Knopik, Jerzy; Malec, Edward

    2015-01-01

    New rotation laws have been recently found for general-relativistic self-gravitating stationary fluids. It was not clear whether they apply to systems rotating with a constant linear velocity. In this paper we fill this gap. The answer is positive. That means, in particular, that these systems should exhibit the recently discovered general-relativistic weak-field effects within rotating tori: the dynamic anti-dragging and the deviation from the Keplerian motion induced by the fluid selfgravity.

  15. Noncommutative Geometry in M-Theory and Conformal Field Theory

    Energy Technology Data Exchange (ETDEWEB)

    Morariu, Bogdan

    1999-05-01

    In the first part of the thesis I will investigate in the Matrix theory framework, the subgroup of dualities of the Discrete Light Cone Quantization of M-theory compactified on tori, which corresponds to T-duality in the auxiliary Type II string theory. After a review of matrix theory compactification leading to noncommutative supersymmetric Yang-Mills gauge theory, I will present solutions for the fundamental and adjoint sections on a two-dimensional twisted quantum torus and generalize to three-dimensional twisted quantum tori. After showing how M-theory T-duality is realized in supersymmetric Yang-Mills gauge theories on dual noncommutative tori I will relate this to the mathematical concept of Morita equivalence of C*-algebras. As a further generalization, I consider arbitrary Ramond-Ramond backgrounds. I will also discuss the spectrum of the toroidally compactified Matrix theory corresponding to quantized electric fluxes on two and three tori. In the second part of the thesis I will present an application to conformal field theory involving quantum groups, another important example of a noncommutative space. First, I will give an introduction to Poisson-Lie groups and arrive at quantum groups using the Feynman path integral. I will quantize the symplectic leaves of the Poisson-Lie group SU(2)*. In this way we obtain the unitary representations of U{sub q}(SU(2)). I discuss the X-structure of SU(2)* and give a detailed description of its leaves using various parametrizations. Then, I will introduce a new reality structure on the Heisenberg double of Fun{sub q} (SL(N,C)) for q phase, which can be interpreted as the quantum phase space of a particle on the q-deformed mass-hyperboloid. I also present evidence that the above real form describes zero modes of certain non-compact WZNW-models.

  16. On the Hyperbolic Structure of Moduli Spaces With 16 SUSYs

    OpenAIRE

    Motl, Lubos; Banks, Tom

    1999-01-01

    We study the asymptotic limits of the heterotic string theories compactified on tori. We find a bilinear form uniquely determined by dualities which becomes Lorentzian in the case of one spacetime dimension. For the case of the SO(32) theory, the limiting descriptions include SO(32) heterotic strings, type I, type IA and other T-duals, M-theory on K3, type IIA theory on K3 and type IIB theory on K3 and possibly new limits not understood yet.

  17. Inventory Control Crucial

    Institute of Scientific and Technical Information of China (English)

    CHRIS; DEVONSHIRE-ELLIS

    2008-01-01

    Inventory control is one of the most important business processes during the operation of a trading or manufacturing company as it relates to purchases,sales and logistic activities,In order to have clear inven- tory management,a company should focus not only on logistic management but also on sales and purchase management.The general view is that the warehouse serves as the most important component of inventory manage- ment and that the accounting department is

  18. Dicty_cDB: VFI471 [Dicty_cDB

    Lifescience Database Archive (English)

    Full Text Available iol.tsukuba.ac.jp/CSM/VF/VFI4-C/VFI471Q.Seq.d/ Representative seq. ID - (Link to Original site) Repres...GXADRMNKELTALAP STMXIKIIAPPERKYSVWIGGSI*aslstfqqmwiskeeydesgpsivhrkcf*tiktsd esashkdlck Translated Amino Acid sequence (All Frames...lstfqqmwiskeeydesgpsivhrkcf*tiktsd esashkdlck Frame B: ---s*vwxqlvsteppixps*nvmlisvkiytvmssylvvq...tory system 4.0 %: endoplasmic reticulum >> prediction for VFI47...nfptnvdlqrrirrirsincpqkmflnn*n*** kcfsqrfm* Homology vs CSM-cDNA Score E Sequences producing significant ali

  19. Cosmological wormholes

    CERN Document Server

    Kirillov, A A

    2015-01-01

    We describe in details the procedure how the Lobachevsky space can be factorized to a space of the constant negative curvature filled with a gas of wormholes. We show that such wormholes have throat sections in the form of tori and are traversable and stable in the cosmological context. The relation of such wormholes to the dark matter phenomenon is briefly described. We also discuss the possibility of the existence of analogous factorizations for all types of homogeneous spaces.

  20. Cosmological wormholes

    Science.gov (United States)

    Kirillov, A. A.; Savelova, E. P.

    2016-05-01

    We describe in details the procedure how the Lobachevsky space can be factorized to a space of the constant negative curvature filled with a gas of wormholes. We show that such wormholes have throat sections in the form of tori and are traversable and stable in the cosmological context. The relation of such wormholes to the dark matter phenomenon is briefly described. We also discuss the possibility of the existence of analogous factorizations for all types of homogeneous spaces.

  1. Dealing with Dilemmas of Difference - Ethical and Psychological Considerations of “Othering” and “Peer Dialogues” in the Research Encounter

    OpenAIRE

    Angela Kühner; Langer, Phil C.

    2010-01-01

    In this paper we review two qualitative interview studies, in which dilemmas of difference played a decisive role. With regard to the first study, which focused on the influence of migration backgrounds in student’s perception of Holocaust Education in Germany, we discuss several research decisions that were made to avoid methodological othering. Concerning a study on HIV risk behavior of gay and bisexual men, psychological challenges of a participa-tory approach that involved peer interviewe...

  2. Just 50 ‘donor groups’ have supplied over half of the Conservative party’s declared donation income in the last decade, a fact disguised by legal ‘fame avoidance’ techniques

    OpenAIRE

    Crone, Stephen; Wilks-Heeg, Stuart

    2010-01-01

    Although the Election Commission has published data before on who gives what to political parties, by splitting up donations across multiple family members or between personal and company donations it has been legally possible for huge donors to largely avoid publicity. Not any more though, because Stephen Crone and Stuart Wilks-Heeg have analysed all donation income received by the Conservative party since 2011 to give the most comprehensive picture every published. The Tories owe their fina...

  3. ETSI reconfigurable radio systems : Status and future directions on software defined radio and cognitive radio standards

    OpenAIRE

    Mueck M.; Piipponen A.; Kalliojarvi K.; Dimitrakopoulos G.; Tsagkaris K.; Demestichas P.; Casadevall F.; Perez-Romero J.; Sallent O.; Baldini G.

    2010-01-01

    Feature Topic on Advances in IEEE Standards and Testbeds for Cognitive Radio Networks International audience This article details the current work status of the ETSI Reconfigurable Radio Systems Techni- cal Committee, positions the ETSI work with respect to other standards efforts (IEEE 802, IEEE SCC41) as well as the European Regula- tory Framework, and gives an outlook on the future evolution. In particular, software defined radio related study results are presented with a focus on SD...

  4. Soe, kodune ja eestimaine / Ell-Maaja Randküla

    Index Scriptorium Estoniae

    Randküla, Ell-Maaja, 1939-2016

    2005-01-01

    Spa-hotell Georg Ots Kuressaares Tori t. 2. Sisekujundus: Liisi Murula ja Raili Paling, OÜ KOKO Arhitektid. Ehitaja: HEA 5. Hotell pälvis Eesti Sisearhitektide Liidu 2004. a. aastapreemiate konkursil ühiskondliku interjööri preemia. L. Murulast ja R. Palingust, nende tähtsamad tööd. Ill.: 2 plaani, 15 värv. vaadet

  5. Interspecific hybridization and polyploidization as tools in ornamental plant breeding

    OpenAIRE

    Tuyl, van, J.M.; Kim, K. B.

    2003-01-01

    Interspecific hybridisation and polyploidy are recognized as the most impor-tant sources of evolution and domestication of flowering plants. In ornamental plant breeding these phenomena go hand in hand and can be observed in the breeding his-tory of many ornamental crops (Rosa, Chrysanthemum, Gladiolus, Alstroemeria, Lil-ium, orchids etc). With lily as model crop techniques developed for overcoming pre- and post-fertilisation barriers are reviewed. For overcoming F1-sterility mitotic and meio...

  6. Almost periodic solutions for a class of higher dimensional Schr(o)dinger equations

    Institute of Scientific and Technical Information of China (English)

    Jiansheng GENG

    2009-01-01

    In this paper, we show that there are almost periodic solutions corresponding to full dimensional invariant tori for higher dimensional Schr(o)dinger equations with Fourier multiplier Jut- Δu + Mξu + f(|u|2)u =0, subject to periodic boundary conditions, where the nonlinearity f is a real-analytic function near u = 0 with f(0) = 0. The proof is based on an improved infinite dimensional KAM theorem.

  7. Arithmetic of Complex Manifolds

    CERN Document Server

    Lange, Herbert

    1989-01-01

    It was the aim of the Erlangen meeting in May 1988 to bring together number theoretists and algebraic geometers to discuss problems of common interest, such as moduli problems, complex tori, integral points, rationality questions, automorphic forms. In recent years such problems, which are simultaneously of arithmetic and geometric interest, have become increasingly important. This proceedings volume contains 12 original research papers. Its main topics are theta functions, modular forms, abelian varieties and algebraic three-folds.

  8. Crime and Punishment

    Institute of Scientific and Technical Information of China (English)

    LEO ZHANG

    2008-01-01

    @@ Insider trading has a long and venerated his-tory on the Chinese stock market. Back in ,the 1990s. the stock market was so plagued by retail investors scouting for so-called "insider tips"- often scams that led to massive losses for the investors-that authorities were forced to close down a slew of unethical trust firms and brokerages, crushing investor confidence and leading to an almost four-year bear market.

  9. Criteria for the density property of complex manifolds

    OpenAIRE

    Kaliman, Shulim; Kutzschebauch, Frank

    2007-01-01

    In this paper we suggest new effective criteria for the density property. This enables us to give a trivial proof of the original Anders\\'en-Lempert result and to establish (almost free of charge) the algebraic density property for all linear algebraic groups whose connected components are different from tori or $\\C_+$. As another application of this approach we tackle the question (asked among others by F. Forstneri\\v{c}) about the density of algebraic vector fields on Euclidean space vanish...

  10. Effect of toroidal magnetic field and plasma rotation on compact toriequilibria

    International Nuclear Information System (INIS)

    The effect of toroidal magnetic field and plasma rotation on compact tori equilibrium configurations is studied. It is found that the equilibrium configurations exist in any toroidal fields. The field dependences of toroidal parameters are analyzed. The effect of opening of the toroidal separatrix and the influence of the toroidal magnetic field, toroidal rotation, the pressure profile type behind the separatrix on it is studied as well. 13 refs.; 11 figs.; 2 tabs

  11. Prevalence and morphological variability of torus palatanus and torus mandibularis

    OpenAIRE

    Zlatanovska, Katerina; Zarkova, Julija; Radeska, Ana; Papakoca, Kiro; Dimova, Cena

    2014-01-01

    Background: The oral tori are non-pathological and benign exostosis of the cortical and limited amount of bone marrow, covered with a thin and poorly vascularized mucosa. The purpose of this study was to determine the prevalence of torus palatanus (TP) and torus mandibularis (TM) and to define morphological variability in relation to age and gender in the population of Shtip region, Macedonia FYR. Methods and materials: The study comprised of 467 patients, 242 females and 225 males, from 2...

  12. Exact Tachyon Condensation on Nocommutative Torus

    CERN Document Server

    Kajiura, H; Takayanagi, T; Kajiura, Hiroshige; Matsuo, Yutaka; Takayanagi, Tadashi

    2001-01-01

    We construct exact noncommutative solutions on tori. This gives an exact description of tachyon condensation on bosonic D-branes, non-BPS D-branes and brane-antibrane systems. We obtain various bound states of D-branes after the tachyon condensation. Our results show that these solutions can be generated by applying the gauge Morita equivalence. We also discuss a general framework of the noncommutative geometry from open strings and D-branes by employing the notion of Morita equivalence.

  13. Unigene BLAST: CBRC-MMUS-14-0015 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-MMUS-14-0015 gnl|UG|Mm#S17083928 OR_2o11A09_H07_001129_56.y1 Adult mouse olfac...tory epithelium library Mus musculus cDNA clone 2o11A09 5', mRNA sequence /clone=2o11A09 /clone_end=5' /gb=CB173244 /gi=37591873 /ug=Mm.329045 /len=588 2e-28 55% ...

  14. Unigene BLAST: CBRC-MMUS-02-0137 [SEVENS

    Lifescience Database Archive (English)

    Full Text Available CBRC-MMUS-02-0137 gnl|UG|Mm#S17084020 OR_2o17A01_D08_001130_60.y1 Adult mouse olfac...tory epithelium library Mus musculus cDNA clone 2o17A01 5', mRNA sequence /clone=2o17A01 /clone_end=5' /gb=CB173341 /gi=37591970 /ug=Mm.223407 /len=533 7e-46 72% ...

  15. Teaching Residents to Teach: The Impact of a Multi-Disciplinary Longitudinal Curriculum to Improve Teaching Skills

    OpenAIRE

    Julian, Katherine A.; O’Sullivan, Patricia S.; Vener, Margo H.; Wamsley, Maria A

    2009-01-01

    Background: Residents have primary responsibility for teaching medical students, yet many receive no formal teaching instruction. This study evaluated the impact of a longitudinal multi­disciplinary teaching curriculum on resident participants’ self-perceived teaching skills. Methods: Residents received instruction on teaching and leadership skills during a four-month longitudinal teaching course. Participants completed a validated pre-post self-assessment inven­tory for teaching and a teach...

  16. Spherical tokamak development in Brazil

    Energy Technology Data Exchange (ETDEWEB)

    Ludwig, Gerson Otto; Bosco, Edson Del; Ferreira, Julio Guimaraes [Instituto Nacional de Pesquisas Espaciais (INPE), Sao Jose dos Campos, SP (Brazil). Lab. Associado de Plasma] (and others)

    2003-07-01

    The general characteristics of spherical tokamaks, or spherical tori, with a brief view of work in this area already performed or in progress at several institutions worldwide are described. The paper presents also the steps in the development of the ETE (Experiment Tokamak spheric) project, its research program, technical characteristics and operating conditions as of December, 2002 a the Associated Plasma Laboratory (LAP) of the National Space Research Institute (INPE) in Brazil. (author)

  17. EFFECT OF PULMONARY REHABILITATION PROGRAMME ON PATIENTS OF STABLE CHRONIC OBSTRUCTIVE PULMONARY DI SEASE

    OpenAIRE

    Surya; Rakesh,; Tariq,, Fahim; Alok; Verma; Ravi

    2013-01-01

    ABSTRACT: BACKGROUND: Chronic Obstructive Pulmonary Disease (COPD) is the most common chronic lung disease causing chronic respira tory disability in majority of people. There is now strong scientific evidence to recommend the application of pulmonary rehabilitation programs in chronic lung diseases. MATERIALS AND METHODS: 28 patients of stable COPD were enrolled for this study. Patients were randomi zed into two groups, one group received pulmonary rehabil...

  18. The conservatives are out of touch with the renewed politics of redistribution

    OpenAIRE

    Cammaerts, Bart

    2013-01-01

    Bart Cammaerts argues that we have entered an era in which the politics of redistribution is reasserting itself, borne out of the 2008 financial crisis and the moral indignation stirred by massive tax-payer bailouts. The Tories have been caught flat-footed by this development, promoting austerity and breaking down social protections, and will suffer the electoral consequences if they do not pay heed to popular sentiment.

  19. Book review: can a woman be both a feminist and a Conservative?

    OpenAIRE

    Cowman, Krista

    2012-01-01

    Studies into female Conservatives are sparse compared to that of their Labour counterparts. The term “Conservative feminist” is still for many the ultimate oxymoron. Sex, Gender and the Conservative Party attempts to address this gap in the literature by examining the political choices and associations of female Tories. Krista Cowman thinks the book captures a party on the verge of change and offers a clear and concise picture of how it shifted its focus to its female members, merging quantit...

  20. About Landau–Hopf scenario in a system of coupled self-oscillators

    Energy Technology Data Exchange (ETDEWEB)

    Kuznetsov, Alexander P.; Kuznetsov, Sergey P.; Sataev, Igor R.; Turukina, Ludmila V., E-mail: lvtur@rambler.ru

    2013-12-17

    The conditions are discussed for which an ensemble of interacting oscillators may demonstrate the Landau–Hopf scenario of successive birth of multi-frequency quasi-periodic motions. A model is proposed that is a network of five globally coupled oscillators characterized by controlled degree of activation of individual oscillators. Illustrations are given for successive birth of tori of increasing dimension via quasi-periodic Hopf bifurcations.

  1. Cystic fibrohistiocytic tumor of the lung presenting as a solitary lesion

    OpenAIRE

    gGiorgio Sgarbi; Cristian Rapicetta; Tommaso Ricchetti; Massimiliano Paci; Alberto Cavazza; Valerio Annessi

    2010-01-01

    Cystic fibrohistiocytic tumor of the lung is a rare neoplasm. In many cases it represents a metastasis from a benign or low-grade fibrohistiocytic tumor of the skin, but occasionally it may be primary. Radiologically it usually occurs as a cystic change of multiple pulmonary nodules, and pneumothorax is the most frequent presenting symptom. We present here a 16-year-old man with recurrent right pneumothorax. The patient had no his-tory of cutaneous fibrohistiocytic lesions. He underwent video...

  2. The ETE spherical Tokamak project. IAEA report

    Energy Technology Data Exchange (ETDEWEB)

    Ludwig, Gerson Otto; Del Bosco, E.; Berni, L.A.; Ferreira, J.G.; Oliveira, R.M.; Andrade, M.C.R.; Shibata, C.S.; Barroso, J.J.; Castro, P.J.; Patire Junior, H. [Instituto Nacional de Pesquisas Espaciais (INPE), Sao Jose dos Campos, SP (Brazil). Lab. Associado de Plasma]. E-mail: ludwig@plasma.inpe.br

    2002-07-01

    This paper describes the general characteristics of spherical tokamaks, or spherical tori, with a brief overview of work in this area already performed or in progress at several institutions worldwide. The paper presents also the historical development of the ETE (Spherical Tokamak Experiment) project, its research program, technical characteristics and operating conditions as of October, 2002 at the Associated Plasma Laboratory (LAP) of the National Space Research Institute (INPE) in Brazil. (author)

  3. NMS Flows on Three-Dimensional Manifolds with One Saddle Periodic Orbit

    Institute of Scientific and Technical Information of China (English)

    B. CAMPOS; A. CORDERO; J. Mart(i)nez ALFARO; P. VINDEL

    2004-01-01

    The simplest NMS flow is a polar flow formed by an attractive periodic orbit and a repulsive periodic orbit as limit sets. In this paper we show that the only orientable, simple, compact,3-dimensional manifolds without boundary that admit an NMS flow with none or one saddle periodic orbit are lens spaces.We also see that when a fattened round handle is a connected sum of tori, the corresponding flow is also a trivial connected sum of flows.

  4. An index for closed orbits in Beltrami fields

    OpenAIRE

    Etnyre, John; Ghrist, Robert

    2001-01-01

    We consider the class of Beltrami fields (eigenfields of the curl operator) on three-dimensional Riemannian solid tori: such vector fields arise as steady incompressible inviscid fluids and plasmas. Using techniques from contact geometry, we construct an integer-valued index for detecting closed orbits in the flow which are topologically inessential (they have winding number zero with respect to the solid torus). This index is independent of the Riemannian structure, and is computable entirel...

  5. Elust pealinna ristteel = Zhizn na perekrestke stolitsõ / Veronika Nuter

    Index Scriptorium Estoniae

    Nuter, Veronika

    2007-01-01

    1980-ndate lõpul alanud ja 17 aastat kestnud Osten Tori ehituslugu. 2000. a. algatatakse detailplaneering kinnistule Pärnu mnt. 110 ja 110a, koostaja AB Künnapu & Padrik. Uue korterelamu arhitektuurse lahenduse saamiseks korraldatakse kolme Soome arhitektuuribüroo vahel konkurss, mille võidab Mustanen-Salminen-Vaarna OY ideekavand. Hoone projekti edasiarendamist jätkab Eesti büroo KPME OÜ. 2006. a. valminud hoone plussid ja miinused

  6. Thresholds to Chaos and Ionization for the Hydrogen Atom in Rotating Fields

    OpenAIRE

    Chandre, C; Farrelly, David; Uzer, T.

    2002-01-01

    We analyze the classical phase space of the hydrogen atom in crossed magnetic and circularly polarized microwave fields in the high frequency regime, using the Chirikov resonance overlap criterion and the renormalization map. These methods are used to compute thresholds to large scale chaos and to ionization. The effect of the magnetic field is a strong stabilization of a set of invariant tori which bound the trajectories and prevent stochastic ionization. In order to ionize, larger amplitude...

  7. Spherical tokamak development in Brazil

    International Nuclear Information System (INIS)

    The general characteristics of spherical tokamaks, or spherical tori, with a brief view of work in this area already performed or in progress at several institutions worldwide are described. The paper presents also the steps in the development of the ETE (Experiment Tokamak spheric) project, its research program, technical characteristics and operating conditions as of December, 2002 a the Associated Plasma Laboratory (LAP) of the National Space Research Institute (INPE) in Brazil. (author)

  8. Explicit angle structures for veering triangulations

    CERN Document Server

    Futer, David

    2010-01-01

    Agol recently introduced the notion of a veering triangulation, and showed that such triangulations naturally arise as layered triangulations of fibered hyperbolic 3-manifolds. We prove, by a constructive argument, that every veering triangulation admits positive angle structures, recovering a result of Hodgson, Rubinstein, Segerman, and Tillmann. Our construction leads to explicit lower bounds on the smallest angle in this positive angle structure, and to information about angled holonomy of the boundary tori.

  9. Spheroidal and toroidal configurations as sources of the Kerr metric. Pt. 1

    International Nuclear Information System (INIS)

    The existence of extended Kerr metric sources of perfect fluid is taken as work-hypothesis to investigate the structure of the boundaries which derive from Boyer's surface condition. We find closed spheroidal configurations which hide an internal cavity as well as toroidal configurations; however, both the boundary of the internal cavity and the tori touch the ring singularity. We judge this feature non-physical and conclude that Boyer's condition is not sufficient to completely define a well behaved physical source. (orig.)

  10. Comparative studies on the souring process of milk by means of enzymatic and electrochemical sensors

    OpenAIRE

    Herrmann, Sigrun; Oelßner, Wolfram; Schulz, Birgit; Guth, Ulrich

    2001-01-01

    In recent years, the demand for quick and specific analytical tools for food analysis has increased and is still expanding. Both the industry and government health agencies require a variety of different ana-lytical methods in the quality assurance of food materials. Analysis is needed for monitoring nutritional parameters, food additives, food contaminants, microbial counts, shelf life assessment and other olfac-tory characteristics like smell and odour. Enzymatic and electrochemical sensors...

  11. The media and climate change

    OpenAIRE

    Bird, H; Boykoff, M.; Goodman, M. K.; Monbiot, G.; Littler, J.

    2009-01-01

    Progressive voices in the arts and heritage sector have called for a politics of cultural democracy as a means of empowering all to participate in public life. Through a rejection of policies of 'inclusion', they have asked more searching questions about the role culture can play in the fight for social justice. At the same time the sector is preparing for a change of ideological direction, as rumours run rife about what a future Tory government, highly critical of state intervention, will do...

  12. Conjecture of Tits type for complex varieties and Theorem of Lie-Kolchin type for a cone

    OpenAIRE

    Keum, JongHae; Oguiso, Keiji; Zhang, De-Qi

    2007-01-01

    First, we shall formulate and prove Theorem of Lie-Kolchin type for a cone and derive some algebro-geometric consequences. Next, inspired by a recent result of Dinh and Sibony we pose a conjecture of Tits type for a group of automorphisms of a complex variety and verify its weaker version. Finally, applying Theorem of Lie-Kolchin type for a cone, we shall confirm the conjecture of Tits type for complex tori, hyperk\\"ahler manifolds, surfaces, and minimal threefolds.

  13. Prevalence and pattern of torus palatinus and torus mandibularis among edentulous patients of Saudi Arabia

    Directory of Open Access Journals (Sweden)

    AlZarea BK

    2016-02-01

    Full Text Available Bader K AlZarea Department of Prosthodontics, College of Dentistry, Al Jouf University, Al Jouf, Kingdom of Saudi Arabia Background: The most remarkable exostoses of the human jaws are torus palatinus (TP and torus mandibularis (TM. The aim of the present study was to actuate the prevalence of TP and TM in relation to age and sex among the edentulous patients of Saudi Arabia.  Methods: The present study included 847 edentulous subjects (458 men and 389 women aged between 51 and 79 years. The subjects were examined for the existence of tori by clinical inspection and palpation. Statistical analysis was performed using SPSS for Windows version.  Results: Among the 847 subjects, 149 (17.59% had either TP or TM. Sixty six (7.79% subjects had TP, whereas 83 (9.80% had TM. The maximum percentage (36.36% of tori was observed in the age-group of 60–69 years. The percentage of males with either tori was higher (19.0% when compared to females (15.94%. According to shape, the occurrence of flat-shaped TP (57.58% and bilateral solitary TM (39.76% was more common.  Conclusion: No significant difference in the presence of tori with respect to sex and age was observed. A comparatively increased prevalence of TP and TM was however observed, and this should be taken into consideration while planning for prosthodontic and periodontal therapy in these patients. Keywords: edentulous, prevalence, torus mandibularis, torus palatinus

  14. Bio-inspired Reverse Engineering of Regulatory Networks : A Revised Approach

    OpenAIRE

    Leon Pozo, Pedro

    2011-01-01

    This work appears to complement an existingproject, ”Bio-inpired reverse engineering of regula-tory networks”[STH09], proposes a new algorithminspired in the artificial development technique per-forming reverse engineering over regulatory networks.The present project studies that article addressingpossible weaknesses and scalability issues. Neverthe-less, during the investigation some updates have beenperformed over the algorithm, improving the previ-ous results in some scenarios. M...

  15. Numerical cubature from Archimedes' hat-box theorem

    OpenAIRE

    Kuperberg, Greg

    2004-01-01

    Archimedes' hat-box theorem states that uniform measure on a sphere projects to uniform measure on an interval. This fact can be used to derive Simpson's rule. We present various constructions of, and lower bounds for, numerical cubature formulas using moment maps as a generalization of Archimedes' theorem. We realize some well-known cubature formulas on simplices as projections of spherical designs. We combine cubature formulas on simplices and tori to make new formulas on spheres. In partic...

  16. A topological extension of GR: Black holes induce dark energy

    OpenAIRE

    Spaans, M.

    2013-01-01

    A topological extension of general relativity is presented. The superposition principle of quantum mechanics, as formulated by the Feynman path integral, is taken as a starting point. It is argued that the trajectories that enter this path integral are distinct, despite any quantum uncertainty in geometry, and thus that space-time topology is multiply connected. Specifically, space-time at the Planck scale consists of a lattice of three-tori that facilitates many distinct paths for particles ...

  17. Exploring Supermassive Black Hole Growth with ALMA

    CERN Document Server

    Kawakatu, N; Granato, G L; Danese, L; Kawakatu, Nozomu; Andreani, Paola; Granato, Gian Luigi; Danese, Luigi

    2007-01-01

    Massive tori with $\\approx 10^{8-9}M_{\\odot}$ are predicted to extend on $\\sim $100 pc scale around the centre of elliptical galaxy progenitors by a model of a supermassive black hole (SMBH) growth coeval to the spheroidal population of the host galaxy. Direct detection of such massive tori would cast light on a key physical condition that allows the rapid growth of SMBHs and the appearance of QSOs at high redshift. For this reason, we examine the detectability of such structures at substantial redshift with the Atacama Large Millimeter Array (ALMA). We propose that submillimeter galaxies (SMGs) are the best targets to test our predictions. In order to assess the observational feasibility, we estimate the expected number counts of SMGs with massive tori and check the detectability with the ALMA instrument, the unique facility which can resolve the central region of high redshift objects. Our work shows that ALMA will be able to resolve and detect high-$J$ ($J >$ 4) CO emissions from $\\sim$100 pc scale extende...

  18. The spectral curve theory for (k, l)-symmetric CMC surfaces

    Science.gov (United States)

    Heller, Lynn; Heller, Sebastian; Schmitt, Nicholas

    2015-12-01

    Constant mean curvature surfaces in S3 can be studied via their associated family of flat connections. In the case of tori this approach has led to a deep understanding of the moduli space of all CMC tori. For compact CMC surfaces of higher genus the theory is far more involved due to the non abelian nature of their fundamental group. In this paper we extend the spectral curve theory for tori developed in Hitchin (1990), Pinkall and Sterling (1989) and for genus 2 surfaces (Heller, 2014) to CMC surfaces in S3 of genus g = k ṡ l with commuting Zk+1 and Zl+1 symmetries. We determine their associated family of flat connections via certain flat line bundle connections parametrized by the spectral curve. We generalize the flow on spectral data introduced in Heller (2015) and prove the short time existence of this flow for certain families of initial surfaces. In this way we obtain countably many 1 -parameter families of new CMC surfaces of higher genus with prescribed branch points and prescribed umbilics.

  19. The clumpy torus around type II AGN as revealed by X-ray fluorescent lines

    CERN Document Server

    Liu, Jiren; Li, Xiaobo; Xu, Weiwei; Gou, Lijun; Cheng, Cheng

    2016-01-01

    The reflection spectrum of the torus around AGN is characterized by X-ray fluorescent lines, which are most prominent for type II AGN. A clumpy torus allows photons reflected from the back-side of the torus to leak through the front free-of-obscuration regions. Therefore, the observed X-ray fluorescent lines are sensitive to the clumpiness of the torus. We analyse a sample of type II AGN observed with Chandra HETGS, and measure the fluxes for the Si Ka and Fe Ka lines. The measured Fe Ka/Si Ka ratios, spanning a range between $5-60$, are far smaller than the ratios predicted from simulations of smooth tori, indicating that the tori of the studied sources have clumpy distributions rather than smooth ones. Compared with simulation results of clumpy tori with a half-opening angle of 60$^{\\circ}$, the Circinus galaxy has a Fe Ka/Si Ka ratio of $\\sim60$, which is close to the simulation results for $N=5$, where $N$ is the average number of clumps along the line of sight. The Fe Ka/Si Ka ratios of the other sources...

  20. Influence of reactor maintenance considerations on the design of a commercial EBT power plant

    International Nuclear Information System (INIS)

    An analysis of the scheduled reactor maintenance requirements of an Elmo Bumpy Torus Reactor (EBTR) and their effect on the reactor and reactor-building design was performed. The requirements for scheduled maintenance are that blanket replacement be accomplished in less time than that required for annual scheduled balance-of-plant maintenance (28 days), that capital and operating costs be minimized and availability maximized. Three circular reactor-building concepts were evaluated: a reactor building with permanent space outboard of the reactor for maintenance operations; a building with permanent maintenance space above the reactor; and a mobile maintenance module concept where the module moves around the perimeter of the reactor building and provides temporary space for maintenance at the required location. This paper presents the rationale for selection. of the first option. Time estimates and equipment requirements for first-wall/blanket/shield (FWBS) replacement are presented