WorldWideScience

Sample records for bc ring system

  1. Bc

    International Nuclear Information System (INIS)

    Mesons with beauty and charm are an interesting theoretical laboratory that should soon become accessible to experiment. One can predict the properties of c bar b states with confidence. In particular, the mass of the ground-state Bc is expected to lie close to 6356 MeV/c2. More than a dozen narrow states lie below flavor threshold. They cascade to the ground state by making electromagnetic or hadronic transitions within the c bar b spectrum. The excited states are extraordinarily narrow. They may be observable in γ or ππ coincidences with Bc. Weak decays of Bc are affected by the strong binding of the bar b and c constituents. The authors estimates of the semi-inclusive decay rates lead to a lifetime τ(Bc) ∼ 1.35 ± 0.15 ps that is appreciably longer than the guess τ(Bc) ∼ (1/τb + 1/τc)-1 ∼ 0.71 to 0.88 ps, which neglects binding. The semi-inclusive analysis understates the important of Bs + light hadron modes. The author's best lifetime estimates is 1.1 to 1.2 ps. Finally, while Bc is an exotic - indeed, undiscovered - state today, it may have important practical applications in the future. The decay Bc → Bs ell may provide a clean and efficient flavor tag for Bs

  2. On the arithmetic of the BC-system

    CERN Document Server

    Connes, Alain

    2011-01-01

    For each prime p and each embedding of the multiplicative group of an algebraic closure of F_p as complex roots of unity, we construct a p-adic indecomposable representation of the integral BC-system as additive endomorphisms of the big Witt ring of an algebraic closure of F_p. The obtained representations are the p-adic analogues of the complex, extremal KMS states at zero temperature of the BC-system. The role of the Riemann zeta function, as partition function of the BC-system over complex numbers is replaced, in the p-adic case, by the p-adic L-functions and the polylogarithms whose values at roots of unity encode the KMS states. We use Iwasawa theory to extend the KMS theory to a covering of the completion of an algebraic closure of the p-adic field. We show that our previous work on the hyperring structure of the adeles class space, combines with p-adic analysis to refine the space of valuations on the cyclotomic extension of Q as a noncommutative space intimately related to the integral BC-system and w...

  3. Spectroscopic properties of the Bc system

    International Nuclear Information System (INIS)

    We present a calculation of the masses of the low lying levels of the bottom charmed meson system, in the framework of the non relativistic potential model approach. We carry out a comparison with previous calculations.The copious production of b quarks in Zθ decays at the Large Electron-Positron (LEP) collider and in 1.8 TeV proton-antiproton collisions at the Fermilab Tevatron opens for study the rich spectroscopy of mesons and baryons containing b and c quarks. A particularly interesting case is the spectrum of c b states. The spectrum and properties of the above mentioned states have been calculated various times in the past in the framework of the potential model approach [1-6]. The recent experimental observation [7-11] of the B+c. meson has inspired new theoretical interest in the problem. The c b spectrum has been considered again either from the potential approach [12-16] and from the lattice simulation point of view [17-18]. In this work, in the framework of the Non Relativistic (NR) potential model approach, we consider five completely different functional forms of the potential that give reasonable accounts for b b and c c spectra [19-23]. The parameters of these different models [19-23] are fitted to actual quarkonium masses [24]. We calculate the masses of the low-lying levels of the bottom charmed meson system that lie below the threshold for strong decay

  4. Drought frequency in central California since 101 B.C. recorded in giant sequoia tree rings

    Science.gov (United States)

    Hughes, Malcolm K.; Brown, Peter M.

    1992-01-01

    Well replicated tree-ring width index chronologies have been developed for giant sequoia at three sites in the Sierra Nevada, California. Extreme low-growth events in these chronologies correspond with regional drought events in the twentieth century in the San Joaquin drainage, in which the giant sequoia sites are located. This relationship is based upon comparison of tree-ring indices with August Palmer Drought Severity Indices for California Climate Division 5. Ring-width indices in the lowest decile from each site were compared. The frequency of low-growth events which occurred at all three sites in the same year is reconstructed from 101 B.C. to A.D. 1988. The inferred frequency of severe drought events changes through time, sometimes suddenly. The period from roughly 1850 to 1950 had one of the lowest frequencies of drought of any one hundred year period in the 2089 year record. The twentieth century so far has had a below-average frequency of extreme droughts.

  5. Burnside Rings of Fusion Systems

    DEFF Research Database (Denmark)

    Reeh, Sune Precht

    In this thesis we study the interactions between saturated fusion systems and group actions of the underlying p-groups. For a saturated fusion system F on a finite p-group S we construct the Burnside ring of F in terms of the finite S-sets whose actions respect the structure of the fusion system...... of Burnside rings given by multiplication with the characteristic idempotent, and we show that this map is the transfer map previously constructed. Applying these results, we show that for every saturated fusion system the ring generated by all (non-idempotent) characteristic elements in the p-local double...... Burnside ring is isomorphic to the p-local Burnside ring of the fusion system, and we disprove a conjecture by Park-Ragnarsson-Stancu on the composition product of fusion systems....

  6. APS storage ring vacuum system

    International Nuclear Information System (INIS)

    The Advanced Photon Source synchrotron radiation facility, under construction at the Argonne National Laboratory, incorporates a large ring for the storage of 7 GeV positrons for the generation of photon beams for the facility's experimental program. The Storage Ring's 1104 m circumference is divided into 40 functional sectors. The sectors include vacuum, beam transport, control, acceleration and insertion device components. The vacuum system, which is designed to operate at a pressure of 1 n Torr, consists of 240 connected sections, the majority of which are fabricated from an aluminum alloy extrusion. The sections are equipped with distributed NeG pumping, photon absorbers with lumped pumping, beam position monitors, vacuum diagnostics and valving. The details of the vacuum system design, selected results of the development program and general construction plans are presented. 11 refs., 6 figs., 3 tabs

  7. The Power Configuration Sequence of the Central World System, 1500-700 BC

    Directory of Open Access Journals (Sweden)

    David Wilkinson

    2015-08-01

    Full Text Available This article is the fifth in a series in which the political careers of civilizations/world systems receive snapshot codings of their overall power structures at feasible intervals. The narratives are produced by collating histories with large frames of reference. The codings are done using a nominal variable, polarity, with seven available values. Previous articles in the series have examined the Indic system 550 bc–ad 1800, the Far Eastern 1025 bc–ad 1850, the Southwest Asian c. 2700–1500 bc, and the Northeast African c. 2625–1500 bc. The Northeast African and Southwest Asian systems and sequences merge c. 1500 bc to form the Central system. In the current article, the power structure of the Central Civilization/ World System is appraised over its first 800 years at 10–year intervals, from 1500 bc to an arbitrary stopping point of 700 bc. The systemic power structure is evaluated in terms of its predominant forms andtheir stability. During this 8-century period, the Central world system showed a distinct individuality, or “character”: multipolar and unipolar structures predominated; there was limited variety in structure, with extreme forms excluded; there was substantial structural stability. Over time, the Central system “aged”: its already limited structural variety further diminished, while its structural stability increased. The sequence of power configurations in the Central system is compared to the expectations of several theories. Toynbee‘s revised civilizational model fares best, but leaves dynamical issues unaddressed; the classical European balance of power model matches the kinematics (the sequence of forms, but not the dynamics, of behavior of the Central system. Alternative future directions of inquiry are discussed.

  8. Volume of Courses Students Carry among Central Data Warehouse (CDW) Institutions: Implications for Recalibration of the BC Transfer System

    Science.gov (United States)

    Box, Dale

    2008-01-01

    The British Columbia (BC) Council on Admissions and Transfer (BCCAT) has undertaken, in the last couple of years, a review of the BC Transfer System. Preliminary findings indicate that the current structure of the BC Transfer Guide (BCTG), which designates institutions as either "sending" institutions or "receiving" institutions, based upon their…

  9. Characterization of liquid scintillation detector (BC-501A) and digital pulse shape discrimination (DPSD) system

    International Nuclear Information System (INIS)

    A digital n/γ pulse shape discrimination (PSD) system is currently under development at Instrumentation and Automation Centre, Malaysian Nuclear Agency. This system aims at simultaneous detection of fast neutron and gamma ray in mixed radiations environment. This work reports the system characterization performed on the liquid scintillation detector (BC-501A) and digital pulse shape discrimination (DPSD) system. The characterization involves measurement of electron light output from the BC-501A detector and energy channels calibration of the pulse height spectra acquired with DPSD system using set of photon reference sources. The main goal of this experiment is to calibrate the ADC channel of our DPSD system, characterized the BC-501 detector and find the position of Compton edge which later could be used as threshold for the n/γ PSD experiment. The detector resolution however is worse as compared to other published data but it is expected as our detector has a smaller active volume

  10. Characterization of liquid scintillation detector (BC-501A) and digital pulse shape discrimination (DPSD) system

    Energy Technology Data Exchange (ETDEWEB)

    Lombigit, L., E-mail: lojius@nm.gov.my; Yussup, N., E-mail: nolida@nm.gov.my; Ibrahim, Maslina Mohd; Rahman, Nur Aira Abd; Rawi, M. Z. M. [Instrumentation Group, Malaysian Nuclear Agency, Bangi, 43000 Kajang, Selangor (Malaysia)

    2015-04-29

    A digital n/γ pulse shape discrimination (PSD) system is currently under development at Instrumentation and Automation Centre, Malaysian Nuclear Agency. This system aims at simultaneous detection of fast neutron and gamma ray in mixed radiations environment. This work reports the system characterization performed on the liquid scintillation detector (BC-501A) and digital pulse shape discrimination (DPSD) system. The characterization involves measurement of electron light output from the BC-501A detector and energy channels calibration of the pulse height spectra acquired with DPSD system using set of photon reference sources. The main goal of this experiment is to calibrate the ADC channel of our DPSD system, characterized the BC-501 detector and find the position of Compton edge which later could be used as threshold for the n/γ PSD experiment. The detector resolution however is worse as compared to other published data but it is expected as our detector has a smaller active volume.

  11. Structural analysis of substrate binding by the TatBC component of the twin-arginine protein transport system.

    Science.gov (United States)

    Tarry, Michael J; Schäfer, Eva; Chen, Shuyun; Buchanan, Grant; Greene, Nicholas P; Lea, Susan M; Palmer, Tracy; Saibil, Helen R; Berks, Ben C

    2009-08-11

    The Tat system transports folded proteins across the bacterial cytoplasmic membrane and the thylakoid membrane of plant chloroplasts. In Escherichia coli substrate proteins initially bind to the integral membrane TatBC complex which then recruits the protein TatA to effect translocation. Overproduction of TatBC and the substrate protein SufI in the absence of TatA led to the accumulation of TatBC-SufI complexes that could be purified using an affinity tag on the substrate. Three-dimensional structures of the TatBC-SufI complexes and unliganded TatBC were obtained by single-particle electron microscopy and random conical tilt reconstruction. Comparison of the structures shows that substrate molecules bind on the periphery of the TatBC complex and that substrate binding causes a significant reduction in diameter of the TatBC part of the complex. Although the TatBC complex contains multiple copies of the signal peptide-binding TatC protomer, purified TatBC-SufI complexes contain only 1 or 2 SufI molecules. Where 2 substrates are present in the TatBC-SufI complex, they are bound at adjacent sites. These observations imply that only certain TatC protomers within the complex interact with substrate or that there is a negative cooperativity of substrate binding. Similar TatBC-substrate complexes can be generated by an alternative in vitro reconstitution method and using a different substrate protein. PMID:19666509

  12. Multimeric complexes among ankyrin-repeat and SOCS-box protein 9 (ASB9), ElonginBC, and Cullin 5: insights into the structure and assembly of ECS-type Cullin-RING E3 ubiquitin ligases.

    Science.gov (United States)

    Thomas, Jemima C; Matak-Vinkovic, Dijana; Van Molle, Inge; Ciulli, Alessio

    2013-08-01

    Proteins of the ankyrin-repeat and SOCS-box (ASB) family act as the substrate-recognition subunits of ECS-type (ElonginBC-Cullin-SOCS-box) Cullin RING E3 ubiquitin ligase (CRL) complexes that catalyze the specific polyubiquitination of cellular proteins to target them for degradation by the proteasome. Therefore, ASB multimeric complexes are involved in numerous cell processes and pathways; however, their interactions, assembly, and biological roles remain poorly understood. To enhance our understanding of ASB CRL systems, we investigated the structure, affinity, and assembly of the quaternary multisubunit complex formed by ASB9, Elongin B, Elongin C (EloBC), and Cullin 5. Here, we describe the application of several biophysical techniques including differential scanning fluorimetry, isothermal titration calorimetry (ITC), nanoelectrospray ionization, and ion-mobility mass spectrometry (IM-MS) to provide structural and thermodynamic information for a quaternary ASB CRL complex. We find that ASB9 is unstable alone but forms a stable ternary complex with EloBC that binds with high affinity to the Cullin 5 N-terminal domain (Cul5NTD) but not to Cul2NTD. The structure of the monomeric ASB9-EloBC-Cul5NTD quaternary complex is revealed by molecular modeling and is consistent with IM-MS and temperature-dependent ITC data. This is the first experimental study to validate structural information for the assembly of the quaternary N-terminal region of an ASB CRL complex. The results suggest that ASB E3 ligase complexes function and assemble in an analogous manner to that of other CRL systems and provide a platform for further molecular investigation of this important protein family. The data reported here will also be of use for the future development of chemical probes to examine the biological function and modulation of other ECS-type CRL systems. PMID:23837592

  13. BC energy plan II and transmission system planning

    International Nuclear Information System (INIS)

    The British Columbia Energy Plan involves Transmission and System planning. B C Transmission corporation is a Crown Corporation. The Energy Plan is based on energy security, energy conservation, environmental leadership and innovation in energy. The implications for transmission are connection to the general development, grid optimization, conservation, innovation and reliability standards

  14. Inductive Rings and Systems of Diophantine Equations

    Institute of Scientific and Technical Information of China (English)

    Rong Fang BIE; Shi Qiang WANG

    2006-01-01

    In this paper, by using model-theoretic methods, it is shown that some systems of unsolved cubic diophantine equations in number theory can have solutions in certain inductive extension rings of the ring I of rational integers. These inductive rings are not fields, and every element of them is a sum of 4 cubes and a sum of 3 squares. Also some of them satisfy the Goldbach conjecture and some others don't.

  15. The Power Configuration Sequence of the Central World System, 1500-700 BC

    OpenAIRE

    David Wilkinson

    2015-01-01

    This article is the fifth in a series in which the political careers of civilizations/world systems receive snapshot codings of their overall power structures at feasible intervals. The narratives are produced by collating histories with large frames of reference. The codings are done using a nominal variable, polarity, with seven available values. Previous articles in the series have examined the Indic system 550 bcad 1800, the Far Eastern 1025 bcad 1850, the Southwest Asian c. 27001500 bc, ...

  16. APS storage ring vacuum system performance

    International Nuclear Information System (INIS)

    The Advanced Photon Source (APS) storage ring was designed to operated with 7-GeV, 100-mA positron beam with lifetimes > 20 hours. The lifetime is limited by residual gas scattering and Touschek scattering at this time. Photon-stimulated desorption and microwave power in the rf cavities are the main gas loads. Comparison of actual system gas loads and design calculations will be given. In addition, several special features of the storage ring vacuum system will be presented

  17. Lectures on algebraic system theory: Linear systems over rings

    Science.gov (United States)

    Kamen, E. W.

    1978-01-01

    The presentation centers on four classes of systems that can be treated as linear systems over a ring. These are: (1) discrete-time systems over a ring of scalars such as the integers; (2) continuous-time systems containing time delays; (3) large-scale discrete-time systems; and (4) time-varying discrete-time systems.

  18. Injection Control System of HLS Storage Ring

    CERN Document Server

    Liu, G; Li, W; Li Chuan; Li, K; Shang, L; Liu, Gongfa; Li, Jingyi; Li, Weimin; Li, Chuan; Li, Kaihong; Shang, Lei

    2001-01-01

    The injection control system of Hefei Light Source (HLS) storage ring is a subsystem of the upgraded HLS control system, which is based upon EPICS. Three programmable logic controllers (PLCs) are used as device controllers, which control one septum modulator and four kicker modulators of HLS storage ring. An Industrial PC is used as Input/Output Controller (IOC) and it connects the PLCs with serial communication (RS232 mode) over fibre. A PC with Linux is used as operator interface (OPI), operator application are running on it. The control system was completed in July 2000. The commissioning shows that the control system is reliable and easy operational.

  19. APS storage ring vacuum system development

    International Nuclear Information System (INIS)

    The Advanced Photon Source synchrotron radiation facility, under construction at the Argonne National Laboratory, incorporates a large ring for the storage of 7 GeV positrons for the generation of photon beams for the facility's materials research program. The Storage Ring's 1104 m circumference is divided into 40 sectors which contain vacuum, beam transport, control, rf and insertion device systems. The vacuum system will operate at a pressure of 1 nTorr and is fabricated from aluminum. The system includes distributed NeG pumping, photon absorbers with lumped pumping, beam position monitors, vacuum diagnostics and valving. An overview of the vacuum system design and details of selected development program results are presented. 5 refs

  20. The ALS Storage Ring RF System

    International Nuclear Information System (INIS)

    The ALS Storage Ring RF System is characterized by the use of the following features: (1) High power loading of two single cell cavities. (2) The use of a tubular ceramic input window employing aperture coupling. (3) The use of waveguide filters and matchers designed for HOM absorption. (4) A comprehensive HOM monitoring system. (5) The use of waveguide water-wedge loads for the magic tee and circulator loads. The results of cavity measurements and high power tests are reported together with the performance of the system during the commissioning and operation phases of the ALS project. Plans for future window development are discussed

  1. Pulsed rf systems for large storage rings

    International Nuclear Information System (INIS)

    The possibility is considered that by using a pulsed rf system a substantial reduction can be made in the rf power requirement for the next generation of large storage rings. For a ring with a sufficiently large circumference, the time between bunch passages, T/sub b/, can exceed the cavity filling time, T/sub f/. As the ratio T/sub b//T/sub f/ increases, it is clear that at some point the average power requirement can be reduced by pulsing the rf to the cavities. In this mode of operation, the rf power is turned on a filling time or so before the arrival of a bunch and is switched off again at the time of bunch passage. There is no rf energy in the accelerating structure, and hence no power dissipation, for most of the period between bunches

  2. Phenomenological predictions of the properties of the $B_{c}$ system

    CERN Document Server

    Fulcher, L P

    1999-01-01

    We present a comprehensive calculation of the energies, splittings and electromagnetic decays of the low-lying levels of the B_{c} system. In order to incorporate running coupling constant effects, we choose Richardson's potential for the central potential and take the spin-dependent potentials from the radiative one-loop calculation of Pantaleone, Tye and Ng. Our ps are determined from the low-lying levels of charmonium (avg. dev. of 19.9 MeV) and of the upsilon system (avg. dev. of 4.3 MeV). We carry out a detailed comparison with the calculations of Eichten and Quigg and the lattice calculations of the NRQCD collaboration. Our result for the ground state energy is 6286 +15 -6 MeV. Our results are generally in agreement with the earlier calculations. However, we find the two lowest 1(+) states to be very close to the j-j coupling limit, in contrast to some of the earlier calculations. The implications of this finding for the photon spectra of the 1P and 2S states are discussed in detail. Some strategies for...

  3. Transit Detectability of Ring Systems Around Extrasolar Giant Planets

    OpenAIRE

    Barnes, Jason W.; Fortney, Jonathan J.

    2004-01-01

    We investigate whether rings around extrasolar planets could be detected from those planets' transit lightcurves. To this end we develop a basic theoretical framework for calculating and interpreting the lightcurves of ringed planet transits based on the existing framework used for stellar occultations, a technique which has been effective for discovering and probing ring systems in the solar system. We find that the detectability of large, Saturn-like ring systems is largest during ingress a...

  4. Pulsed rf systems for large storage rings

    International Nuclear Information System (INIS)

    In this note we consider the possibility that by using a pulsed rf system, perhaps a system which operates at a somewhat higher frequency, a substantial reduction can be made in the rf power requirement for the next generation of large storage rings. A large effort over a period of many years has been expended in the attempt to increase the shunt impedance of rf structures for cw systems. Without turning to superconductivity only modest gains in the shunt impedance remain to be made by further detailed adjustments in cell shape. On the other hand, very little effort has as yet gone into the optimization of structures for pulsed systems. The structure parameters to be quoted in this report do not therefore necessarily represent values close to those for an optimum design. It is expected that the system designs set out here can be improved upon with further experimental and theoretical work. 11 refs., 3 figs

  5. A new TL finger ring dosimetry system with automated ring identification

    International Nuclear Information System (INIS)

    TL finger ring dosemeters, particularly if used during surgery, etc., have to be small, convenient to wear and suitable for cold sterilisation. This makes automated ring identification difficult to achieve. A new approach is described, based on a circular TLD chip mounted with Kapton foil on a small aluminium disc containing a miniaturised circular bar code (radial 6 digit ITF) and a six digit number. The ring is inserted into a disposable plastic finger ring and protected by a circular cover plate. This ring design is convenient to wear, fits all finger sizes and can be cold sterilised for multiple use in surgery. For readout the ring is opened by a semi-automated device and up to four bar coded discs inserted into a modified standard TLD card for automatic processing by Harshaw readers models 6600 or 8800. The reader contains a video bar code identification system based on a minaturised CCD camera and image processing by special PC software. The circular bar codes are mathematically linearised and decoded directly from the enhanced grey scale picture obtained with optimised illumination by power LEDs. The system described (Patent No. A 398005/1994) is a fast and economic solution for fully (or semi-) automated evaluation of TLD finger rings in larger personnel monitoring services. (author)

  6. Cavity Ring-down Spectroscopic System And Method

    KAUST Repository

    Alquaity, Awad Bin Saud

    2015-05-14

    A system and method for cavity ring-down spectroscopy can include a pulsed quantum cascade laser, an optical ring-down cavity, a photodetector, and an oscilloscope. The system and method can produce pulse widths of less than 200 ns with bandwidths greater than 300 pm, as well as provide temporal resolution of greater than 10 .mu.s.

  7. Integrability of Particle System around a Ring Source as the Newtonian Limit of a Black Ring

    CERN Document Server

    Igata, Takahisa; Yoshino, Hirotaka

    2014-01-01

    The geodesic equation in the five-dimensional singly rotating black ring is non-integrable unlike the case of the Myers-Perry black hole. In the Newtonian limit of the black ring, its geodesic equation agrees with the equation of motion of a particle in the Newtonian potential due to a homogeneous ring gravitational source. In this paper, we show that the Newtonian equation of motion allows the separation of variables in the spheroidal coordinates, providing an non-trivial constant of motion quadratic in momenta. This shows that the Newtonian limit of a black ring recovers the symmetry of its geodesic system, and the geodesic chaos is caused by relativistic effects.

  8. Rings

    International Nuclear Information System (INIS)

    The essence of vortex physics is that at certain low-energy scales elementary excitations of a point particle theory can behave like strings rather than particles. Vortices are the resulting string-like solutions; their thickness sets the distance scale beyond which physics is string-like rather than particle-like. String degrees of freedom are massless in the sense that excitations on a string can have an arbitrarily low frequency. Non-string degrees of freedom correspond to massive particles and are absent from the low energy spectrum. This article considers only field theories with vortices at low energies. The possible existence of a class of solitons in these vortex theories will be discussed. They are vortex rings: they are localized and finite in energy, and able to carry the quantum numbers of point particles. Rings are thus particle-like solutions of a vortex theory, which is itself a limit of a point particle field theory

  9. Los Alamos Proton Storage Ring fast-extraction kicker system

    International Nuclear Information System (INIS)

    We describe the kicker system used by the Los Alamos Proton Storage Ring (PSR) for fast extraction of accumulated 800-MeV proton beam. The system has several severe constraints in terms of rise time, field quality, and magnet dimensions. These are, in turn, defined by characteristics of the stored beam, ring lattice, and the allowable activation of ring components. Design methods to meet the constraints are outlined here and we describe the novel modulators that produce the fast pulses required. 3 refs., 7 figs

  10. Beam injection system into an electron ring compressor

    International Nuclear Information System (INIS)

    A system for three-turn injection of the beam into the electronic ring compressor is elaborated. The electron beam is rejected from the linear accelerator at an average energy of 1.5 MeV through the screening nozzle at a radius of 26 cm into the growing magnetic field. The energy of the injected electrons and the strength of the magnetic field are varied so that injection is always performed onto the equilibrium radius. In this case, the ring will feature an electron pulse spread of +-3.5% which makes it possible to accumulate up to 1013 particles in the ring, never exceeding the threshold of the azimuthal coherent non-stability. From the point of view of its design and technology, the injection system provides for creating superhigh vacuum of about 10-9 mm Hg in the compressor chamber which ensures the life of the ring of up to 2 ms

  11. The Pseudomonas aeruginosa CreBC two-component system plays a major role in the response to β-lactams, fitness, biofilm growth, and global regulation.

    Science.gov (United States)

    Zamorano, Laura; Moyà, Bartolomé; Juan, Carlos; Mulet, Xavier; Blázquez, Jesús; Oliver, Antonio

    2014-09-01

    Pseudomonas aeruginosa is a ubiquitous versatile environmental microorganism with a remarkable ability to grow under diverse environmental conditions. Moreover, P. aeruginosa is responsible for life-threatening infections in immunocompromised and cystic fibrosis patients, as the extraordinary capacity of this pathogen to develop antimicrobial resistance dramatically limits our therapeutic arsenal. Its large genome carries an outstanding number of genes belonging to regulatory systems, including multiple two-component sensor-regulator systems that modulate the response to the different environmental stimuli. Here, we show that one of two systems, designated CreBC (carbon source responsive) and BlrAB (β-lactam resistance), might be of particular relevance. We first identified the stimuli triggering the activation of the CreBC system, which specifically responds to penicillin-binding protein 4 (PBP4) inhibition by certain β-lactam antibiotics. Second, through an analysis of a large comprehensive collection of mutants, we demonstrate an intricate interconnection between the CreBC system, the peptidoglycan recycling pathway, and the expression of the concerning chromosomal β-lactamase AmpC. Third, we show that the CreBC system, and particularly its effector inner membrane protein CreD, plays a major role in bacterial fitness and biofilm development, especially in the presence of subinhibitory concentrations of β-lactams. Finally, global transcriptomics reveals broad regulatory functions of CreBC in basic physiological aspects, particularly anaerobic respiration, in both the presence and absence of antibiotics. Therefore, the CreBC system is envisaged as a potentially interesting target for improving the efficacy of β-lactams against P. aeruginosa infections. PMID:24936599

  12. The SLS storage ring support and alignment systems

    CERN Document Server

    Zelenika, S; Rivkin, L; Rohrer, M; Rossetti, D; Ruland, R; Schlott, V; Streun, A; Wiegand, Peter

    2001-01-01

    Storage rings of third generation synchrotron radiation facilities pose severe challenges for lowering the beam emittances and increasing the lifetimes, requiring thus increasing positioning and alignment precisions that must be preserved over long time spans. This work describes the SLS storage ring mechanical support, alignment and disturbances compensation systems that allow to meet these requirements. In particular, their design, the tests done on the respective prototypes and the applicability of the developed arrangement to beam-based alignment are addressed.

  13. The Omega Ring Imaging Cerenkov Detector readout system user's guide

    International Nuclear Information System (INIS)

    The manual describes the electronic readout system of the Ring Imaging Cerenkov Detector at the CERN Omega Spectrometer. The system is described in its configuration of September 1984 after the Rich readout system had been used in two Omega experiments. (U.K.)

  14. CO Gas orbiting around the GG Tauri A triple System: rings beyond the ring ?

    CERN Document Server

    Tang, Ya-Wen; Guilloteau, Stephane; Chapillon, Edwige; Pietu, Vincent; Di Folco, Emmanuel; Bary, Jeff; Beck, Tracy; Beust, Herve; Boehler, Yann; Gueth, Frederic; Hure, Jean-Marc; Pierens, Arnaud; Simon, Michal

    2015-01-01

    We aim at unveiling the observational imprint of physical mechanisms that govern planetary formation in the young, multiple system GG Tau A. We present ALMA observations of $^{12}$CO and $^{13}$CO 3-2 and continuum at 0.9 mm at 0.35" resolution. The $^{12}$CO gas, found in the cavity of the dust ring where no $^{13}$CO gas is detected, confirms the existence of a CO accretion shock near the circumstellar disk of GG Tau Aa. The outer disk and the hot spot lying at the outer edge of the dust ring are observed both in $^{12}$CO and $^{13}$CO. The gas emission in the outer disk can be radially decomposed in a series of slightly overlapping gaussian rings, suggesting the presence of unresolved gaps. The dip closest to the disk center lies at a radius very close to the CO hot spot location ($\\sim250-260$~au). Studies of the CO excitation conditions reveal that the outer disk remains in the shadow of the ring. The hot spot probably results from local heating processes. The two latter points strongly support the hypo...

  15. SR monitor system for the ATF Damping Ring

    International Nuclear Information System (INIS)

    Preliminary results of the synchrotron radiation (SR) monitor system developed for the Damping Ring of the accelerator test facility in Tsukuba-KEK (KEK-ATF-DR) are described; The system consists of a two dimensional CCD camera and a double-sweep streak camera for observing the vertical and longitudinal shapes of bunched beams, respectively. (author)

  16. Gravito-electrodynamics and the structure of planetary ring systems

    Science.gov (United States)

    Mendis, D. A.

    1984-01-01

    Recent spacecraft observations of the Saturnian and Jovian ring systems have highlighted a plethora of interesting new phenomena associated with those regions containing fine (micron and sub-micron sized) dust. Recognizing that these dust grains, by virtue of being immersed within the planetary magnetospheres, are electrostatically charged to the point that they experience comparable gravitational and electric forces, a new 'gravito-electrodynamic' theory has been developed to describe their dynamics. This theory has been successful in explaining all these phenomena in a systematic way. In this review, the basic model and its range of validity are outlined, and its application to the Saturnian and Jovian ring systems are discussed.

  17. Understanding Student Mobility in the B.C. Public Post-Secondary System. Highlights from the Student Transitions Project: Post-Secondary Student Mobility

    Science.gov (United States)

    British Columbia Council on Admissions and Transfer, 2013

    2013-01-01

    This annual newsletter summarizes the work of the Post-secondary Student Mobility (PSM) Subcommittee of the Student Transitions Project (STP) . In an effort to better understand student mobility in the B.C. public post-secondary system, the Student Transitions Project continues to describe and quantify the numerous education pathways of students…

  18. Model calibration and beam control systems for storage rings

    International Nuclear Information System (INIS)

    Electron beam storage rings and linear accelerators are rapidly gaining worldwide popularity as scientific devices for the production of high-brightness synchrotron radiation. Today, everybody agrees that there is a premium on calibrating the storage ring model and determining errors in the machine as soon as possible after the beam is injected. In addition, the accurate optics model enables machine operators to predictably adjust key performance parameters, and allows reliable identification of new errors that occur during operation of the machine. Since the need for model calibration and beam control systems is common to all storage rings, software packages should be made that are portable between different machines. In this paper, we report on work directed toward achieving in-situ calibration of the optics model, detection of alignment errors, and orbit control techniques, with an emphasis on developing a portable system incorporating these tools

  19. Quantum mechanical theory of a structured atom-diatom collision system - A + BC/1-Sigma/

    Science.gov (United States)

    Devries, P. L.; George, T. F.

    1977-01-01

    The problem of a 2-p state atom colliding with a singlet sigma state diatom, which involves multiple potential surfaces, is investigated. Within a diabatic representation for the electronic degrees of freedom (plus spin-orbit interaction), coupled scattering equations are derived in both space-fixed and body-fixed coordinate systems. Coefficients, analogous to Percival-Seaton coefficients, are obtained. Approximations to the exact equations, including angular momenta decoupling approximations, are discussed for both the space-fixed and body-fixed formalisms.

  20. Synthesis of Heterocyclic Ring Systems Using Organometallic Reagents

    Institute of Scientific and Technical Information of China (English)

    Sameer Agarwal; Jan Kn(o)ll; Micha P. Krahl; Hans-Joachim Kn(o)lker

    2005-01-01

    @@ 1Introduction We developed novel synthetic routes to heterocyclic ring systems by using transition metal-mediated or -catalyzed reactions. A Lewis acid-promoted addition of the propargyl Grignard reagent 2 to the Schiff base 1 followed by a silvermediated oxidative cyclization of the homopropargylamine 3 provided the aryl-substituted pyrrole 4. Combined with a chemoselective hydrogenation of the pyrrole ring, this method has been applied to the total synthesis of the biologically active fused indolizidine alkaloids ( ± )-harmicine and ( ± )-crispine A[1]. See Fig. 1.

  1. The fine structure of the Saturnian ring system

    International Nuclear Information System (INIS)

    A dust disc within a planetary magnetosphere constitutes a novel type of dust-ring current. Such an azimuthal current carrying dust disc is subject to the dusty plasma analog of the well known finite-resistivity 'tearing' mode instability in regular plasma current sheets, at long wavelengths. It is proposed that the presently observed fine ringlet structure of the Saturnian ring system is a relic of this process operating at cosmogonic times and breaking up the initial proto-ring (which may be regarded as an admixture of fine dust and plasma) into an ensemble of thin ringlets. It is shown that this instability developes at a rate that is many orders of magnitude faster than any other known instability, when the disc thickness reaches a value that is comparable to its present observed value. (Auth.)

  2. Position Ring System using Anger Type Detectors

    Energy Technology Data Exchange (ETDEWEB)

    Joel S. Karp, principal investigator

    2004-12-14

    The overall objective of our project was to develop PET scanners and imaging techniques that achieve high performance and excellent image quality. Our approach was based upon 3-D imaging (no septa) with position-sensitive Anger-logic detectors, whereby the encoding ratio of resolution elements to number of photo-multiplier tube channels is very high. This design led to a series of PET systems that emphasized cost-effectiveness and practicality in a clinical environment.

  3. The injection system of the stretcher ring ELSA

    International Nuclear Information System (INIS)

    For the stretcher ring ELSA in the framwork of this thesis an injection system has been concipated and constructed which should allow all projected operational modes of this stretcher ring, the stretcher, the post-acceleration, and the accumulation mode. The proof could be performed that the realized concept allows all these operational modes. Furthermore it could be shown that the injection shifted from the equilibrium orbit has no disadvantageous effects on a uniform extraction and by this on a high touching ratio. In fact it is even possible to apply the decay of the coherent betatron oscillations around the equilibrium orbit, caused by injection of the incident beam shifted from the equilibrium orbit, to diagnosis purposes: By reproduction of this damping process in a simulation model statements on nonlinearities present in the ring and by this statements on the actual phase-space structure are possible. It has so been shown that the concept presented in this thesis and realized for this thesis represents a suited injection system for the stretcher ring ELSA. (orig.)

  4. Radio frequency system of the RIKEN ring cyclotron

    International Nuclear Information System (INIS)

    The radio-frequency system of the RIKEN ring cyclotron (K = 540) is required to work in a frequency range of 20 to 45 MHz and to generate the maximum acceleration voltage 250 kV. A new movable box type variable frequency resonator was designed for that purpose. The final amplifier is capable of supplying RF power of 300 kW. The whole system had been installed at RIKEN in September 1986 and has been working well. (author)

  5. The fluid systems for the SLD Cherenkov ring imaging detector

    International Nuclear Information System (INIS)

    We describe the design and operation of the fluid delivery, monitor and control systems for the SLD barrel Cherenkov Ring Imaging Detector (CRID). The systems deliver drift gas (C2H6 + TMAE), radiator gas (C5F12 + N2) and radiator liquid (C6F14). Measured critical quantities such as electron lifetime in the drift gas and ultra-violet (UV) transparencies of the radiator fluids, together with the operational experience, are also reported

  6. Survey of Digital Feedback Systems in High Current Storage Rings

    International Nuclear Information System (INIS)

    In the last decade demand for brightness in synchrotron light sources and luminosity in circular colliders led to construction of multiple high current storage rings. Many of these new machines require feedback systems to achieve design stored beam currents. In the same time frame the rapid advances in the technology of digital signal processing allowed the implementation of these complex feedback systems. In this paper I concentrate on three applications of feedback to storage rings: orbit control in light sources, coupled-bunch instability control, and low-level RF control. Each of these applications is challenging in areas of processing bandwidth, algorithm complexity, and control of time-varying beam and system dynamics. I will review existing implementations as well as comment on promising future directions

  7. TechBC Memory Project: Mike Sollanych

    OpenAIRE

    Hendrigan, Holly

    2015-01-01

    Mike Sollanych is the subject of this interview. He attended TechBC in 2001, in the Information Technology stream. He chose to leave TechBC after SFU assumed administrative control, opting instead for an IT program at BCIT. He is now a Technical Systems Analyst at SFU.

  8. Quantum interference in an electron-hole graphene ring system

    Energy Technology Data Exchange (ETDEWEB)

    Smirnov, D.; Schmidt, H.; Haug, R. J. [Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstr. 2 30167 Hannover (Germany)

    2013-12-04

    Quantum interference is observed in a graphene ring system via the Aharonov Bohm effect. As graphene is a gapless semiconductor, this geometry allows to study the unique situation of quantum interference between electrons and holes in addition to the unipolar quantum interference. The period and amplitude of the observed Aharonov-Bohm oscillations are independent of the sign of the applied gate voltage showing the equivalence between unipolar and dipolar interference.

  9. Los Alamos Proton Storage Ring (PSR) injection deflector system

    International Nuclear Information System (INIS)

    We describe a pulsed magnetic deflector system planned for the injection system of the PSR. Two sets of magnets, appropriately placed in the optical systems of both the ring and the injection transport line, provide control of the rate at which particles are injected into a given portion of transverse phase space and limit the interaction of stored beam with the injection stripping foil. High-current modulators that produce relatively complex waveforms are required for this purpose. Solid-state drivers using direct feedback to produce the necessary waveforms are discussed as replacements for the more conventional high-voltage tube technology

  10. The kicker magnet system for TRISTAN Accumulation Ring injection

    International Nuclear Information System (INIS)

    The injection of electron beams to TRISTAN Accumulation Ring (AR) was started in November 1983 and the positron injection started in November 1985. For the injection of electron and positron beams to AR, the unique kicker system was developed. In the kicker power supply the charging to the main capacitor was done with the resonant charge system together with the auxiliary charging unit. The impedance matching circuit was added to the kicker magnet for getting the required current form with least reflecting oscillation. In this paper we report the performance of this kicker system. (author)

  11. Structural and functional studies of the Mycobacterium tuberculosis VapBC30 toxin-antitoxin system: implications for the design of novel antimicrobial peptides.

    Science.gov (United States)

    Lee, In-Gyun; Lee, Sang Jae; Chae, Susanna; Lee, Ki-Young; Kim, Ji-Hun; Lee, Bong-Jin

    2015-09-01

    Toxin-antitoxin (TA) systems play important roles in bacterial physiology, such as multidrug tolerance, biofilm formation, and arrest of cellular growth under stress conditions. To develop novel antimicrobial agents against tuberculosis, we focused on VapBC systems, which encompass more than half of TA systems in Mycobacterium tuberculosis. Here, we report that theMycobacterium tuberculosis VapC30 toxin regulates cellular growth through both magnesium and manganese ion-dependent ribonuclease activity and is inhibited by the cognate VapB30 antitoxin. We also determined the 2.7-Å resolution crystal structure of the M. tuberculosis VapBC30 complex, which revealed a novel process of inactivation of the VapC30 toxin via swapped blocking by the VapB30 antitoxin. Our study on M. tuberculosis VapBC30 leads us to design two kinds of VapB30 and VapC30-based novel peptides which successfully disrupt the toxin-antitoxin complex and thus activate the ribonuclease activity of the VapC30 toxin. Our discovery herein possibly paves the way to treat tuberculosis for next generation. PMID:26150422

  12. Radio frequency system of the RIKEN ring cyclotron

    International Nuclear Information System (INIS)

    The radio-frequency system of the RIKEN ring cyclotron is required to work in a frequency range of 20 to 45 MHz and to generate the maximum acceleration voltage of 250 kV. A new movable box-type variable-frequency resonator which is a compact half wave length coaxial type was developed for the above purpose. Each of two resonators is powered by separate RF power amplifier capable of delivering the power of 300 kW. The whole system was installed in September 1986 and has been working successfully. (author)

  13. TRANSIT MODEL OF PLANETS WITH MOON AND RING SYSTEMS

    International Nuclear Information System (INIS)

    Since the discovery of the first exoplanets, those most adequate for life to begin and evolve have been sought. Due to observational bias, however, most of the discovered planets so far are gas giants, precluding their habitability. However, if these hot Jupiters are located in the habitable zones of their host stars, and if rocky moons orbit them, then these moons may be habitable. In this work, we present a model for planetary transit simulation considering the presence of moons and planetary rings around a planet. The moon's orbit is considered to be circular and coplanar with the planetary orbit. The other physical and orbital parameters of the star, planet, moon, and rings can be adjusted in each simulation. It is possible to simulate as many successive transits as desired. Since the presence of spots on the surface of the star may produce a signal similar to that of the presence of a moon, our model also allows for the inclusion of starspots. The result of the simulation is a light curve with a planetary transit. White noise may also be added to the light curves to produce curves similar to those obtained by the CoRoT and Kepler space telescopes. The goal is to determine the criteria for detectability of moons and/or ring systems using photometry. The results show that it is possible to detect moons with radii as little as 1.3 R⊕ with CoRoT and 0.3 R⊕ with Kepler.

  14. Pedology around a 6700 year old Neolithic ring ditch system in Germany

    Science.gov (United States)

    Leopold, Matthias; Völkel, Jörg; Schmotz, Karl; Huerkamp, Kerstin

    2010-05-01

    The cultural landscape in Europe is the product of many different human and natural activities and processes. Settlement, clearing and farming over thousands of years are constantly transforming the landscape and the according bio- and geo-components like flora and fauna, relief, hydrology, soils and others. As Geoarchaeology tries to reconstruct certain stages of this cultural landscape development, the existence of geoarchives of the respective time period are a crucial precondition. Soil science often works with colluvium as geoarchives but that presupposes the original soil to be destroyed by erosion. Therefore there is a lack of in situ soils of certain time periods throughout Europe. During archaeological excavations conducted by the Kreisarchäologie Deggendorf in eastern Bavaria late 2008 a new Neolithic ring ditch system was discovered which dates back to 4700 BC. Beside its enormous archaeological relevance the study site offers unique possibilities for pedological studies. Situated in the loess belt of eastern Bavaria calcic luvisols form the native soils of the region. However, black soils from older floodplains, the so-called Tschernitza, are described some hundred meters beside the excavation area. In addition black sediments which fill the pits of a Neolithic settlement close to the ring ditch system have been detected. The black backfill sediments are correlated with anthropogenic settlement activities. Interestingly, the backfills of the contemporaneous ring ditch system differ. The 2 m wide and 2.5 m deep ditch functioned as an ideal trap for naturally eroded sediments. The backfills of the ditch indicate different phases of sedimentation and artificial reformation of the ditch. Furthermore, the analysis of thin sections and laboratory data (such as RFA, RDA, pedogenic oxides , magn. suszept., etc.) together with geophysical measurements point to the existence of a fully developed calcic luvisol around 6700 years ago. At the same time within some

  15. Verifying the modes of cyclic conjugation in tetrabenzo[bc,ef,op,rs]circumanthracene

    Directory of Open Access Journals (Sweden)

    Gutman Ivan

    2012-01-01

    Full Text Available Cyclic conjugation in the "empty" central ring of tetrabenzo- [bc,ef,op,rs]circumanthracene (TBCA is stronger than in its neighboring "nonempty" rings, contradicting the predictions of Kekulè-structure-based theoretical models. Earlier examples of such anomalous cyclic conjugation were observed in highly strained, non-planar benzenoid systems. Because the molecule of TBCA is perfectly planar and strain-free, its cyclic conjugation pattern could be tested and verified by means of high-level, B3LYP/6- 311+G(d,p, ab initio DFT calculations.

  16. Autoantibody to the C3b/C4b receptor and absence of this receptor from erythrocytes of a patient with systemic lupus erythematosus.

    OpenAIRE

    Wilson, J. G.; Jack, R M; Wong, W. W.; Schur, P H; D.T. Fearon

    1985-01-01

    A 29-yr-old woman with systemic lupus erythematosus (SLE) was found to have no detectable C3b/C4b receptors (CR1) on her erythrocytes (E) when they were assayed by the binding of rabbit polyclonal and murine monoclonal (Yz-1) anti-CR1. Analysis by two-color fluorescent flow cytometry of CR1 expression on the patient's B lymphocytes that had been stained indirectly with monoclonal anti-B1 and rabbit F(ab')2 anti-CR1 also revealed a marked deficiency of CR1. Total cellular CR1 of neutrophils, a...

  17. Sterol Ring System Oxidation Pattern in Marine Sponges

    Directory of Open Access Journals (Sweden)

    S. Ramakrishna Rao

    2005-06-01

    Full Text Available Abstract: The marine sponges (Porifera are a unique group of sedentary organisms from which several novel natural products are reported, many of which have useful biological activities. In producing unusual sterols, they occupy a preeminent position among the various groups of organisms. The polar sterols of sponges reported as at the end of the year 2002 number about 250; their ring structure changing a hundred times. The oxidation pattern in the sterol ring system, from the point of view of biogenesis seems to be mainly of four types. Each sponge species is able to produce sterols fitting into one of the four main biogenetic pathways viz., (i 3β-hydroxy-Δ5-sterol pathway, (ii 3β-hydroxy-Δ7-sterol pathway, (iii 3β-hydroxy-Δ5,7-sterol pathway, and (iv 3α-hydroxy sterol pathway.

  18. Saturn's F ring and shepherd satellites a natural outcome of satellite system formation

    Science.gov (United States)

    Hyodo, Ryuki; Ohtsuki, Keiji

    2015-09-01

    Saturn's F ring is a narrow ring of icy particles, located 3,400 km beyond the outer edge of the main ring system. Enigmatically, the F ring is accompanied on either side by two small satellites, Prometheus and Pandora, which are called shepherd satellites. The inner regular satellites of giant planets are thought to form by the accretion of particles from an ancient massive ring and subsequent outward migration. However, the origin of a system consisting of a narrow ring and shepherd satellites remains poorly understood. Here we present N-body numerical simulations to show that a collision of two of the small satellites that are thought to accumulate near the main ring's outer edge can produce a system similar to the F ring and its shepherd satellites. We find that if the two rubble-pile satellites have denser cores, such an impact results in only partial disruption of the satellites and the formation of a narrow ring of particles between two remnant satellites. Our simulations suggest that the seemingly unusual F ring system is a natural outcome at the final stage of the formation process of the ring-satellite system of giant planets.

  19. BC Power : BC Hydro pricing under regulation

    International Nuclear Information System (INIS)

    The regulatory framework of gas and electric utilities in British Columbia were described. Both are natural monopolies that are regulated by the Public Utility Commissions. The regulatory process allows for an open discussion between the utility, customers, and intervenors on their views on rate design and allocation or revenue requirement to the various rate classes. This presentation outlined BC Hydro's rate design timeline; principles of the Bonbright tariff; and, the fairness, simplicity, efficiency and revenue requirements of a rate design principle. Methods to design stepped rates were suggested in which energy is billed at Tier 1 prices as long as cumulative energy consumption for the year is less than 90 per cent of the annual customer base line; and, energy is billed at the Tier 2 price when cumulative energy consumption for the year is greater than 90 per cent of the annual customer base line. It was concluded that regulation ensures that rate design principles are met and balanced with stakeholder views. tabs., figs

  20. AP calculus AB/BC

    CERN Document Server

    Schwartz, Stu

    2013-01-01

    All Access for the AP® Calculus AB & BC Exams Book + Web + Mobile Everything you need to prepare for the Advanced Placement® exam, in a study system built around you! There are many different ways to prepare for an Advanced Placement® exam. What's best for you depends on how much time you have to study and how comfortable you are with the subject matter. To score your highest, you need a system that can be customized to fit you: your schedule, your learning style, and your current level of knowledge. This book, and the free online tools that come with it, will help you personalize your AP® Cal

  1. The structure of paramagnetic centres and the formation of defects in the B-C, B-C-Ti and B-C-Cr systems

    International Nuclear Information System (INIS)

    In this work a radiospectroscopic investigation of the B-C, B-C-Ti and B-C-Cr systems was made in the range of 0 to 30 at% carbon at 4.2, 77 and 300 K. It is shown that in the B-C system, with a change of carbon content from 0 to 30% there are two concentration ranges in which a change occurs in the character of EPR signal: the first from 0 to 13% carbon and the second where the carbon content is 18 to 30%. The g factor, the width, the form and the intensity of EPR lines indicate that in the first range the EPR signal is due to the B12C complexes, which represent the lattice of α-boron with one carbon atom. In the second range the experimental data indicate that probably the introduction of four carbon atoms occurs, so that the formation of B12C4 centres is in question. The change in intensity of the signal on introduction and increase of titanium and chromium contents indicates different mechanisms of interaction of the basic components in this system. Keeping in mind that with increasing content of addition the microhardness of samples increases, while the intensity of the EPR signal decreases, it is probable that larger amounts of the B13C2-phase, which is characterized by a higher microhardness, are then formed. (author)

  2. Development of the orbit feedback system for the VSX ring

    International Nuclear Information System (INIS)

    An orbit feedback system will be installed in the VSX ring to stabilize the photon beam. The new COD correction method, the eigenvector method with constraints, is adopted for calculation of the steering-magnet currents. A computer simulation shows that the new method can tightly fix the beam positions at insertion devices, correcting the whole closed orbit globally with almost the same performance as the ordinary eigenvector method. A test VME unit including DSP and shared memory boards is being developed for the fast feedback control and its performance test shows that the total feedback time is less than 1 ms (875 μs) except for the network and VME-bus transfer times related to the shared memory board

  3. Commissioning results of the APS storage ring diagnostics systems

    International Nuclear Information System (INIS)

    Initial commissionings of the Advanced Photon Source (APS) 7-GeV storage ring and its diagnostics systems have been done. Early studies involved single-bunch measurements for beam transverse size (σx ∼ 150 μm, σy ∼ 50 μm), current, injection losses, and bunch length. The diagnostics have been used in studies related to the detection of an extra contribution to beam jitter at ∼ 6.5 Hz frequency; observation of bunch lengthening (σ ∼ 30 to 60 ps) with single-bunch current; observation of an induced vertical, head-tail instability; and detection of a small orbit change with insertion device gap position. More recently, operations at 100-mA stored-beam current, the baseline design goal, have been achieved with the support of beam characterizations

  4. RELIABILITY ANALYSIS OF RING, AGENT AND CLUSTER BASED DISTRIBUTED SYSTEMS

    Directory of Open Access Journals (Sweden)

    R.SEETHALAKSHMI

    2011-08-01

    Full Text Available The introduction of pervasive devices and mobile devices has led to immense growth of real time distributed processing. In such context reliability of the computing environment is very important. Reliability is the probability that the devices, links, processes, programs and files work efficiently for the specified period of time and in the specified condition. Distributed systems are available as conventional ring networks, clusters and agent based systems. Reliability of such systems is focused. These networks are heterogeneous and scalable in nature. There are several factors, which are to be considered for reliability estimation. These include the application related factors like algorithms, data-set sizes, memory usage pattern, input-output, communication patterns, task granularity and load-balancing. It also includes the hardware related factors like processor architecture, memory hierarchy, input-output configuration and network. The software related factors concerning reliability are operating systems, compiler, communication protocols, libraries and preprocessor performance. In estimating the reliability of a system, the performance estimation is an important aspect. Reliability analysis is approached using probability.

  5. Comparing the accuracy of ES-BC, EIS-GS, and ES Oxi on body composition, autonomic nervous system activity, and cardiac output to standardized assessments

    Directory of Open Access Journals (Sweden)

    Lewis JE

    2011-09-01

    Full Text Available John E Lewis1, Stacey L Tannenbaum1, Jinrun Gao3, Angelica B Melillo1, Evan G Long1, Yaima Alonso2, Janet Konefal1, Judi M Woolger2, Susanna Leonard1, Prabjot K Singh1, Lawrence Chen1, Eduard Tiozzo1 1Department of Psychiatry and Behavioral Sciences, 2Department of Medicine, University of Miami Miller School of Medicine, Miami, FL, 3State Farm Insurance, Bloomington, IL, USA Background and purpose: The Electro Sensor Complex (ESC is software that combines three devices using bioelectrical impedance, galvanic skin response, and spectrophotometry: (1 ES-BC (Electro Sensor-Body Composition; LD Technology, Miami, FL to assess body composition, (2 EIS-GS (Electro Interstitial Scan-Galvanic Skin; LD Technology to predict autonomic nervous system activity, and (3 ES Oxi (Electro Sensor Oxi; LD Technology to assess cardiac output. The objective of this study was to compare each to a standardized assessment: ES-BC to dual-energy X-ray absorptiometry (DXA, EIS-GS to heart rate variability, and ES Oxi to BioZ Dx Diagnostic System (BioZ Dx; SonoSite Inc, Bothell, WA. Patients and methods: The study was conducted in two waves. Fifty subjects were assessed for body composition and autonomic nervous system activity. Fifty-one subjects were assessed for cardiac output. Results: We found adequate relative and absolute agreement between ES-BC and DXA for fat mass (r = 0.97, P < 0.001 with ES-BC overestimating fat mass by 0.1 kg and for body fat percentage (r = 0.92, P < 0.001 with overestimation of fat percentage by 0.4%. For autonomic nervous system activity, we found marginal relative agreement between EIS-GS and heart rate variability by using EIS-GS as the predictor in a linear regression equation (adjusted R2 = 0.56, P = 0.03. For cardiac output, adequate relative and absolute agreement was found between ES Oxi and BioZ Dx at baseline (r = 0.60, P < 0.001, after the first exercise stage (r = 0.79, P < 0.001, and after the second exercise stage (r = 0.86, P

  6. The magic ring systems thinking approach to control systems

    CERN Document Server

    Mella, Piero

    2014-01-01

    This book presents a gradual path toward ""educating"" readers in understanding how Control Systems truly operate and in recognizing, simulating and improving them in all fields of activity. Starting from the hypothesis that knowledge of Control Systems is not only a technical fact but also represents a discipline - that is, ""A discipline is a developmental path for acquiring certain skills or competencies. (...) To practice a discipline is to be a lifelong learner. You ""never arrive""; you spend your life mastering disciplines."" (Senge, 2006, p. 10) - Piero Mella has set the objective of m

  7. Present status of the ring cyclotron vacuum system

    International Nuclear Information System (INIS)

    The accelerator in the Research Center for Nuclear Physics, Osaka University, is the cascade type, in which the AVF cyclotron that started the operation about 20 years ago is used as the injector, and the ring cyclotron that was completed three years ago is used as the booster, and it has been jointly utilized mainly for the research on atomic nucleus physics. These two cyclotrons are different in their performances and constitution of machinery and equipment, such as the construction of vacuum tanks, sealing types, the kinds of vacuum pumps and the arrangement, but commonness was given to the design concept, operation method, the control of operation, the interlock for the protection of equipment and so on, thus consideration was given to contribute to the operation, monitoring and maintenance by operators. The constitution of the vacuum tanks and their connection, pneumatic expansion seal and the structural materials of the vacuum tanks are described. The constitution of the evacuating system, the operation and monitoring are explained. In three years, the time of the operation of the evacuating system reached 20,000 hours. The degree of attained vacuum has been as designed, and the operation has been carried out satisfactorily without trouble. There was not long stoppage. (K.I.)

  8. An objective reference system for studying rings in the ocean

    Science.gov (United States)

    Castelão, Guilherme P.; Irber, Luiz C.; Villas Boas, Ana B. M.

    2013-12-01

    Rings are marine vortices with a scale of hundreds of kilometers that can last for months, whose associated transport and mixing play an important role in the ocean dynamics. Such features are traditionally treated as a geostrophic flow, but since the centrifugal acceleration is not negligible in the inner core, the cyclo-geostrophic balance is a better approximation for the rings. In the present work, we describe a novel objective technique to identify the ring center, which is used as the origin of a convenient framework to handle rings under the cyclo-geostrophic balance. Furthermore, we correct the velocity field by the translation to isolate the swirl movement, a procedure ignored by other methodologies. We show that the lack of such correction would lead to an error of 30 km on the center definition of a ship surveyed North Brazil Current Ring with 160 km of radius. Another distinct characteristic of our approach is the flexibility in the spatio-temporal structure of the data, because it allows for ungridded data, an important ability for in situ observations. That also enables the use of a hybrid dataset composed from different instruments. The error on the Monte Carlo experiments to identify the center of the propagating ring is less than 10 km, and depends on the level of noise, sampling strategy, and strength of the ring, among other factors. This technique was fully implemented in PyRings, an open Python library with a collection of procedures to handle oceanic rings and mesoscale eddies in general.

  9. DESIGN AND DEVELOPMENT OF THE SNS RING VACUUM INSTRUMENTATION AND CONTROL SYSTEMS

    International Nuclear Information System (INIS)

    BNL is undertaking the design, construction and commissioning of the Spallation Neutron Source (SNS) accumulator ring and the beam transport lines [l]. Ultrahigh vacuum of 10-9 Torr is required in the accumulator ring to minimize beam-gas ionization, a contributing factor to the e-p instability observed in a few high-intensity proton storage rings. All vacuum instrumentation must be capable of local and remote operation to achieve a reliable vacuum system, especially in this extremely high intensity accelerator. The design and development of the SNS ring vacuum instrumentation and control through the Experimental Physics and Industrial Control System (EPICS) distributed real-time software tools are presented

  10. Design considerations for a feedback system to control self-bunching in ion-storage rings

    International Nuclear Information System (INIS)

    We discuss the feasibility of a feedback system to cure self-bunching of the electron-cooled coasting ion-beam in CELSIUS. Such a system may also aid stable operation of accumulator rings for future spallation neutron sources or heavy ion rings used for inertial fusion energy production

  11. Synthesis of the ABCD and ABCDE ring systems of azaspiracid-1†‡

    OpenAIRE

    Zhou, Xiao-Ti; Carter, Rich G.

    2004-01-01

    The efficient syntheses of the ABCD ring system of the originally proposed structure of azaspiracid-1 and the ABCDE ring system of the revised structure of azaspiracid-1 containing the correct stereochemistry at C6, C10, C13, C14, C16, C17, C19, C21, C22, C24 and C25 have been achieved.

  12. Saturn's Rings

    Science.gov (United States)

    Cuzzi, J. N.

    2014-12-01

    The rings are changing before our eyes; structure varies on all timescales and unexpected things have been discovered. Many questions have been answered, but some answers remain elusive (see Cuzzi et al 2010 for a review). Here we highlight the major ring science progress over the mission to date, and describe new observations planned for Cassini's final three years. Ring Composition and particle sizes: The rings are nearly all water ice with no other ices - so why are they reddish? The C Ring and Cassini Division are "dirtier" than the more massive B and A Rings, as shown by near-IR and, recently, microwave observations. Particle sizes, from stellar and radio occultations, vary from place to place. Ring structure, micro and macro: numerous spiral density waves and ubiquitous "self-gravity wakes" reveal processes which fostered planet formation in the solar system and elsewhere. However, big puzzles remain regarding the main ring divisions, the C Ring plateau structures, and the B Ring irregular structure. Moonlets, inside and out, seen and unseen: Two gaps contain sizeable moonlets, but more gaps seem to contain none; even smaller embedded "propeller" objects wander, systematically or randomly, through the A ring. Rubble pile ringmoons just outside the rings may escaped from the rings, and the recently discovered "Peggy" may be trying this as we watch. Impact bombardment of the rings: Comet fragments set the rings to rippling on century-timescales, and boulders crash through hourly; meanwhile, the constant hail of infalling Kuiper belt material has a lower mass flux than previously thought. Origin and Age of the Rings: The ring mass and bombardment play key roles. The ring mass is well known everywhere but in the B Ring (where most of it is). New models suggest how tidal breakup of evolving moons may have formed massive ancient rings, of which the current ring is just a shadow. During its last three years, the Cassini tour profile will allow entirely new

  13. Multiple internal seal ring micro-electro-mechanical system vacuum packaging method

    Science.gov (United States)

    Hayworth, Ken J. (Inventor); Yee, Karl Y. (Inventor); Shcheglov, Kirill V. (Inventor); Bae, Youngsam (Inventor); Wiberg, Dean V. (Inventor); Challoner, A. Dorian (Inventor); Peay, Chris S. (Inventor)

    2008-01-01

    A Multiple Internal Seal Ring (MISR) Micro-Electro-Mechanical System (MEMS) vacuum packaging method that hermetically seals MEMS devices using MISR. The method bonds a capping plate having metal seal rings to a base plate having metal seal rings by wafer bonding the capping plate wafer to the base plate wafer. Bulk electrodes may be used to provide conductive paths between the seal rings on the base plate and the capping plate. All seals are made using only metal-to-metal seal rings deposited on the polished surfaces of the base plate and capping plate wafers. However, multiple electrical feed-through metal traces are provided by fabricating via holes through the capping plate for electrical connection from the outside of the package through the via-holes to the inside of the package. Each metal seal ring serves the dual purposes of hermetic sealing and providing the electrical feed-through metal trace.

  14. Ring lens focusing and push-pull tracking scheme for optical disk systems

    Science.gov (United States)

    Gerber, R.; Zambuto, J.; Erwin, J. K.; Mansuripur, M.

    1993-01-01

    An experimental comparison of the ring lens and the astigmatic techniques of generating focus-error-signal (FES) in optical disk systems reveals that the ring lens generates a FES over two times steeper than that produced by the astigmat. Partly due to this large slope and, in part, because of its diffraction-limited behavior, the ring lens scheme exhibits superior performance characteristics. In particular the undesirable signal known as 'feedthrough' (induced on the FES by track-crossings during the seek operation) is lower by a factor of six compared to that observed with the astigmatic method. The ring lens is easy to align and has reasonable tolerance for positioning errors.

  15. The Ring System of Uranus: Flat as a Pancake, Sprinkled with Dust

    Energy Technology Data Exchange (ETDEWEB)

    de Pater, I; Gibbard, S G; Hammel, H B

    2005-02-02

    We present a high quality image of the uranian ring system, obtained in July 2004 at 2.2 {micro}m with the adaptive optics camera NIRC2 on the Keck II telescope. Using these data, we report the first ground-based image of the ring 1986U2R, seen only once before by the Voyager spacecraft. We show that this ring extends inward to {approx} 7000 km above the Uranus cloud deck. Its VIF (total vertically integrated I/F) is {approx} 100 m. We further detected narrow sheets of dust in between the {delta} and {epsilon} rings, and in between rings 4 and {alpha}, with a VIF of 14 and 20 m, respectively. Surprisingly, we find that the particles in Uranus' 9 main rings are distributed within a mono-layer, rather than the usually adopted poly-layer model. We come to this conclusion via a comparison of the VIF as derived from our 2003 data at a ring opening angle B {approx} 18{sup o} (from Gibbard et al. 2004) with those derived in this paper at B {approx} 11{sup o}. We show that the VIF increases approximately as 1/sinB at the ring ansae, but is independent of sinB in front of the disk. This combination of factors can only be explained if the particles in Uranus' rings are distributed in a mono-layer, a configuration which makes the uranian system unique amongst the giant planets.

  16. Computer network for on-lne control system of the IHEP ring accelerator

    International Nuclear Information System (INIS)

    A block-diagram for computer network of the IHEP ring accelerator control system is substantiated. The interface card for ES-1010 computer is described, it operates simultaneously on 4 channels. The system software for computer network is considered

  17. BC Hydro shops for GHG offsets

    International Nuclear Information System (INIS)

    BC Hydro is reported to have offered to purchase one million tonnes of carbon dioxide reductions in Canada's Greenhouse Gas Emissions Reduction Trading program (GERT). The program uses a baseline and credit system, where emitters purchase measurable quantities of site-specific GHG reductions. Since mid-1998, the program registered five bilateral trades and seven offers to sell. BC Hydro's recent offer is the first offer to buy. BC Hydro has made the offer to buy in expectation of the introduction of the start of the Kyoto Protocol reductions, and expects to be in the game for some time to come if it is to meet its obligations under the Kyoto Protocol. Preference will be given to projects located in Canada, but BC Hydro will consider reductions created anywhere in the world. The financial range of a single trade is between $50,000 and $1 million. (GHG offsets are currently trading in North America for between $.50 and $3.00 Cdn per metric tonne of carbon dioxide equivalent.) At present, offsets are selling at a heavily discounted price because of the uncertainty that investments made now will be credited against future regulations curbing emitters. Consequently, buying now while prices are low, may lead to sizable benefits later, depending on the actual regulations when they are promulgated. Trading now will also give BC Hydro greater credibility and assurance to have its voice heard when discussions about emissions trading and the implementation of emission trading rules reaches the serious stage

  18. Note: O-ring stack system for electron gun alignment

    International Nuclear Information System (INIS)

    We present a reliable method for aligning an electron gun which consists of an electron source and lenses by controlling a stack of rubber O-rings in a vacuum condition. The beam direction angle is precisely tilted along two axes by adjusting the height difference of a stack of O-rings. In addition, the source position is shifted in each of three orthogonal directions. We show that the tilting angle and linear shift along the x and y axes as obtained from ten stacked O-rings are ±2.55° and ±2 mm, respectively. This study can easily be adapted to charged particle gun alignment and adjustments of the flange position in a vacuum, ensuring that its results can be useful with regard to electrical insulation between flanges with slight modifications

  19. A complete infrared Einstein ring in the gravitational lens system B1938+666

    NARCIS (Netherlands)

    King, LJ; Jackson, N; Blandford, RD; Browne, IWA; de Bruyn, AG; Fassnacht, C; Koopmans, L; Marlow, D; Wilkinson, PN

    1998-01-01

    We report the discovery, using NICMOS on the Hubble Space Telescope, of an arcsec-diameter Einstein ring in the gravitational lens system B1938 + 666. The lensing galaxy is also detected, and is most likely an early-type galaxy. Modelling of the ring is presented and compared with the radio structur

  20. Convergent synthesis of the HIJKLM ring system of ciguatoxin CTX3C.

    Science.gov (United States)

    Takamura, Hiroyoshi; Nishiuma, Naoki; Abe, Takashi; Kadota, Isao

    2011-09-01

    The HIJKLM ring system of ciguatoxin CTX3C was synthesized in a convergent manner. The key steps were a conjugate addition/alkylation sequence, spiroacetalization, intramolecular allylation, ring-closing metathesis, and hydrogenation to form the 36-α-methyl substituent. PMID:21805971

  1. Planetary Rings

    Science.gov (United States)

    Gordon, M. K.; Araki, S.; Black, G. J.; Bosh, A. S.; Brahic, A.; Brooks, S. M.; Charnoz, S.; Colwell, J. E.; Cuzzi, J. N.; Dones, L.; Durisen, R. H.; Esposito, L. W.; Ferrari, C.; Festou, M.; French, R. G.; Giuliatti-Winter, S. M.; Graps, A. L.; Hamilton, D. P.; Horanyi, M.; Karjalainen, R. M.; Krivov, A. V.; Krueger, H.; Larson, S. M.; Levison, H. F.; Lewis, M. C.; Lissauer, J. J.; Murray, C. D.; Namouni, F.; Nicholson, P. D.; Olkin, C. B.; Poulet, F.; Rappaport, N. J.; Salo, H. J.; Schmidt, J.; Showalter, M. R.; Spahn, F.; Spilker, L. J.; Srama, R.; Stewart, G. R.; Yanamandra-Fisher, P.

    2002-08-01

    The past two decades have witnessed dramatic changes in our view and understanding of planetary rings. We now know that each of the giant planets in the Solar System possesses a complex and unique ring system. Recent studies have identified complex gravitational interactions between the rings and their retinues of attendant satellites. Among the four known ring systems, we see elegant examples of Lindblad and corotation resonances (first invoked in the context of galactic disks), electromagnetic resonances, spiral density waves and bending waves, narrow ringlets which exhibit internal modes due to collective instabilities, sharp-edged gaps maintained via tidal torques from embedded moonlets, and tenuous dust belts created by meteoroid impact onto, or collisions between, parent bodies. Yet, as far as we have come, our understanding is far from complete. The fundamental questions confronting ring scientists at the beginning of the twenty-first century are those regarding the origin, age and evolution of the various ring systems, in the broadest context. Understanding the origin and age requires us to know the current ring properties, and to understand the dominant evolutionary processes and how they influence ring properties. Here we discuss a prioritized list of the key questions, the answers to which would provide the greatest improvement in our understanding of planetary rings. We then outline the initiatives, missions, and other supporting activities needed to address those questions, and recommend priorities for the coming decade in planetary ring science.

  2. Jupiter's rings

    International Nuclear Information System (INIS)

    Voyager 2 observations of the jovian ring system discovered by Voyager 1 are presented. The rings were observed both above and below the jovian equatorial plane and at extremely low and high phase angles. This ring system seems to represent a steady state configuration for small particles that are slowly moving in toward Jupiter. It must be resupplied from sources well outside Roche's limit. (author)

  3. Low-level RF system design for the next linear collider damping ring

    International Nuclear Information System (INIS)

    The design current for the Next Linear Collider (NLC) damping rings is an order of magnitude higher than existing damping rings. As opposed to storage rings, damping rings are required to operate at a high repetition frequency. Transient beam loading is therefore particularly severe. The NLC design calls for a full current fill pattern consisting of up to 4 trains of 90 bunches for a total dc current of 1.2 A. However, using conventional filling techniques, with a rapid current ramp the ring energy acceptance could decrease due to transient loading and the beam might not be captured. In this paper the authors describe two features of the low-level rf system design. The first avoids any reduction of duty cycle while the second ensures beam capture and regulation of the cavity voltages and beam phase

  4. Hydrodynamic optimization of trust ring pump and lubricating oil system for large hydroelectric units thrust bearing

    International Nuclear Information System (INIS)

    Thrust-ring-pump is a kind of extreme-low specific speed centrifugal pump with special structure as numerous restrictions form thrust bearing and operation conditions of hydro turbine generator unit. Because the oil circulating and cooling system with thrust-ring- pump has a lot of advantages in maintenance and compactness in structure, it has widely been used in large and medium-sized hydro-generator units. Since the diameter and the speed of the thrust ring is limited by the generator set, the matching relationship between the flow passage inside the thrust ring (equivalent to impeller) and oil bath (equivalent to volute) has great influence on hydrodynamic performance of thrust-ring-pump, additionally, the head and discharge are varying with the operation conditions of hydro-generator unit and characteristic of the oil circulating and cooling system. As so far, the empirical calculation method is employed during the actual engineering design, in order to guarantee the operating performance of the oil circulating and cooling system with thrust-ring-pump at different conditions, a collaborative hydrodynamic design and optimization of both the oil circulating and cooling system and thrust-ring-pump is purposed in this paper. Firstly, the head and discharge required at different conditions are decided by 1D flow numerical simulation of the oil circulating and cooling system. Secondly, the flow passages of thrust-ring-pump are empirically designed under the restrictions of diameter and the speed of the thrust ring according to the head and discharge from the simulation. Thirdly, the flow passage geometry matching optimization between holes inside the thrust ring and oil bath is implemented by means of 3D flow simulation and performance prediction. Then, the pumps and the oil circulating and cooling system are collaborative hydrodynamic optimized with predicted head- discharge curve and the efficiency-discharge curve of thrust-ring-pump. The presented methodology has

  5. A Saturn Ring Observer Mission Using Multi-Mission Radioisotope Power Systems

    International Nuclear Information System (INIS)

    Saturn remains one of the most fascinating planets within the solar system. To better understand the complex ring structure of this planet, a conceptual Saturn Ring Observer (SRO) mission is presented that would spend one year in close proximity to Saturn's A and B rings, and perform detailed observations and measurements of the ring particles and electric and magnetic fields. The primary objective of the mission would be to understand ring dynamics, including the microphysics of individual particles and small scale (meters to a few kilometers) phenomena such as particle agglomeration behavior. This would be accomplished by multispectral imaging of the rings at multiple key locations within the A and B rings, and by ring-particle imaging at an unprecedented resolution of 0.5 cm/pixel. The SRO spacecraft would use a Venus-Earth-Earth-Jupiter Gravity Assist (VEEJGA) and be aerocaptured into Saturn orbit using an advanced aeroshell design to minimize propellant mass. Once in orbit, the SRO would stand off from the ring plane 1 to 1.4 km using chemical thrusters to provide short propulsive maneuvers four times per revolution, effectively causing the SRO vehicle to 'hop' above the ring plane. The conceptual SRO spacecraft would be enabled by the use of a new generation of multi-mission Radioisotope Power Systems (RPSs) currently being developed by NASA and DOE. These RPSs include the Multi-Mission Radioisotope Thermoelectric Generator (MMRTG) and Stirling Radioisotope Generator (SRG). The RPSs would generate all necessary electrical power (≥330 We at beginning of life) during the 10-year cruise and 1-year science mission (∼11 years total). The RPS heat would be used to maintain the vehicle's operating and survival temperatures, minimizing the need for electrical heaters. Such a mission could potentially launch in the 2015-2020 timeframe, with operations at Saturn commencing in approximately 2030

  6. Numerical study of thin layer ring on improving the ice formation of building thermal storage system

    International Nuclear Information System (INIS)

    Ice thermal storage systems have been widely used in HVAC and R systems for improving energy efficiency and reducing energy costs around the world. In this paper, a numerical model is developed to simulate the ice formation in a typical ice thermal storage system. The first study is to investigate the effect of a cooled cylinder placed in a rectangular space filled with water on the ice formation process. The validated numerical model can predict temperature distribution associated with liquid fraction during the process. Based on the result obtained from the first study, further research is focused on the novel structure of thin layer ring. The computational solutions can demonstrate that the thin layer ring structure can successfully increase an ice generated area and shorten the ice formation period in a typical ice thermal storage system. Finally, a parametric study was carried out to investigate the effect of material, thickness, and arrangement of thin layer ring. It predicted that the heat transfer performance of the thin layer ring is dependent on its material, thickness, and arrangement. Ice formation with novel thin layer ring can be improved by increasing the thermal conductivity of a material. A copper ring has the best performance among aluminum, stainless steel, magnesium alloy. The results show that the ice formation rate can be increased by increasing the thickness of the ring from 0.25 mm to 1 mm, while slowed by increasing from 1 mm to 2 mm and has the best performance with 3 mm ring in this study. Finally, the staggered arrangement of ring shows the best results of the ice formation compared to one parallel and two parallel cases. - Highlights: •A thin layer ring structure is studied systematically to enhance ice formation. •Increasing thermal conductivity of thin layer ring can increase ice formation rate. •Ice formation rate is also dependent on the thickness of thin layer ring. •Increasing thin layer ring area can increase ice

  7. Fungal Origins of the Bicyclo[2.2.2]diazaoctane Ring System of Prenylated Indole Alkaloids

    DEFF Research Database (Denmark)

    Finefield, Jennifer M.; Frisvad, Jens C.; Sherman, David H.;

    2012-01-01

    Over eight different families of natural products consisting of nearly 70 secondary metabolites that contain the bicyclo[2.2.2]diazaoctane ring system have been isolated from various Aspergillus, Penicillium, and Malbranchea species. Since 1968, these secondary metabolites have been the focus of...... ring system. Furthermore, the diverse fungal origin of these natural products is closely examined and, in many cases, updated to reflect the currently accepted fungal taxonomy....

  8. Auto-production of biosurfactants reverses the coffee ring effect in a bacterial system

    OpenAIRE

    Sempels, Wouter; De Dier, Raf; Mizuno, Hideaki; Hofkens, Johan; Vermant, Jan

    2013-01-01

    The deposition of material at the edge of evaporating droplets, known as the ‘coffee ring effect’, is caused by a radially outward capillary flow. This phenomenon is common to a wide array of systems including colloidal and bacterial systems. The role of surfactants in counteracting these coffee ring depositions is related to the occurrence of local vortices known as Marangoni eddies. Here we show that these swirling flows are universal, and not only lead to a uniform deposition of colloids b...

  9. Dealing with load imbalances and aquifer heterogeneity : design and monitoring of the ATES system in Agassiz, BC

    Energy Technology Data Exchange (ETDEWEB)

    Allen, D.M.; Bridger, D.W. [Simon Fraser Univ., Burnaby, BC (Canada)

    2003-07-01

    The development and implementation of aquifer thermal energy storage (ATES) is often hindered by climate conditions that create load imbalances, and by complex hydrogeology that creates uncertainties in design. Due consideration was given to load imbalance and aquifer complexity in the case of the ATES system at Agriculture and Agri-Foods Canada's new laboratory facility located in Agassiz, British Columbia. Heat and cold energy to the building are supplied by four production wells, with an operational design which favours seasonal energy storage. A fifth well was drilled so that it could act as a heat dissipation well. Blank and screen sections were placed in a manner to reduce or eliminate hydraulic and thermal short-circuiting within gravel layers between wells. Within the well field are monitoring wells, which are used for temperature logging. The temperature logs showed that some thermal breakthrough took place during the first year of operation, and that the system operated under an excessive cooling load throughout the period. 8 refs., 1 tab., 5 figs.

  10. Hardware Design of Wireless Physical Token Ring System for Mobile and Cell Communication

    Directory of Open Access Journals (Sweden)

    Nidal F. Shilbayeh

    2004-01-01

    Full Text Available A wireless network system based on an infrared and Laser scanning Physical Token Ring architecture (W-PTRS was designed, built and tested successfully. The network provides a different way of utilizing the concept of a token ring network but with a higher efficiency related to the speed of data transfer and the ability to parallel process client-server requests leading to a new concept of the token ring system, which will not fail simply because of ring breakage. The study proposes a new wireless communication protocol, which is neither IEEE802.11 nor Bluetooth. This newly developed protocol could prove to be an excellent communication media if supported by industry. If implemented, this wireless system will provide an alternative but efficient way of wireless communication.

  11. BPM system and its development for the storage ring of NSRRC

    International Nuclear Information System (INIS)

    The storage ring of NSRRC is a 1.5 GeV synchrotron light source. About 60 BPMs (beam position monitors) were installed in the storage ring. High precision closed orbits were measured by Bergoz's MX-BPMs. Data were acquired by multichannel 16-bit ADC modules. The orbit data was sampled every millisecond. Fast orbit data were shared by reflective memory network to support fast orbit feedback. The Averaged data were updated to control database at a rate of 10 Hz. Turn-by-turn beam position signals were processed by several Bergoz's log-ratio BPMs and recorded by a transient digitizer to support various beam physics study. Digital BPMs were installed at the storage ring to improve the BPM system functionality at the storage ring, supporting routine operation and study of beam physics. The system structure, software environment and performance of the BPM system are summarized in this report

  12. Dragging of inertial frames in the composed black-hole-ring system

    Energy Technology Data Exchange (ETDEWEB)

    Hod, Shahar [The Ruppin Academic Center, Emeq Hefer (Israel); The Hadassah Institute, Jerusalem (Israel)

    2015-11-15

    A well-established phenomenon in general relativity is the dragging of inertial frames by a spinning object. In particular, due to the dragging of inertial frames by a ring orbiting a central black hole, the angular velocity Ω{sub H}{sup BH-ring} of the black-hole horizon in the composed black-hole-ring system is no longer related to the black-hole angular momentum J{sub H} by the simple Kerr-like (vacuum) relation Ω{sub H}{sup Kerr}(J{sub H}) = J{sub H}/2M{sup 2}R{sub H} (here M and R{sub H} are the mass and horizon-radius of the black hole, respectively). Will has performed a perturbative treatment of the composed black-hole-ring system in the regime of slowly rotating black holes and found the explicit relation Ω{sub H}{sup BH-ring}(J{sub H} = 0, J{sub R}, R) = 2J{sub R}/R{sup 3} for the angular velocity of a central black hole with zero angular momentum, where J{sub R} and R are respectively the angular momentum of the orbiting ring and its proper circumferential radius. Analyzing a sequence of black-hole-ring configurations with adiabatically varying (decreasing) circumferential radii, we show that the expression found by Will for Ω{sub H}{sup BH-ring}(J{sub H} = 0, J{sub R}, R) implies a smooth transition of the central black-hole angular velocity from its asymptotic near-horizon value Ω{sub H}{sup BH-ring}(J{sub H} = 0, J{sub R}, R → R{sub H}{sup +}) → 2J{sub R}/R{sub H}{sup 3} (that is, just before the assimilation of the ring by the central black hole), to its final Kerr (vacuum) value Ω{sub H}{sup Kerr}(J{sub H}{sup new})= J{sub H}{sup new}/2M{sup new2}R{sub H}{sup new} [that is, after the adiabatic assimilation of the ring by the central black hole. Here J{sub H}{sup new} = J{sub R}, M{sup new}, and R{sub H}{sup new} are the new parameters of the resulting Kerr (vacuum) black hole after it assimilated the orbiting ring]. We use this important observation in order to generalize the result of Will to the regime of black-hole-ring configurations

  13. Dragging of inertial frames in the composed black-hole–ring system

    Energy Technology Data Exchange (ETDEWEB)

    Hod, Shahar, E-mail: shaharhod@gmail.com [The Ruppin Academic Center, 40250, Emeq Hefer (Israel); The Hadassah Institute, 91010, Jerusalem (Israel)

    2015-11-19

    A well-established phenomenon in general relativity is the dragging of inertial frames by a spinning object. In particular, due to the dragging of inertial frames by a ring orbiting a central black hole, the angular velocity Ω{sub H}{sup BH-ring} of the black-hole horizon in the composed black-hole–ring system is no longer related to the black-hole angular momentum J{sub H} by the simple Kerr-like (vacuum) relation Ω{sub H}{sup Kerr}(J{sub H})=J{sub H}/2M{sup 2}R{sub H} (here M and R{sub H} are the mass and horizon-radius of the black hole, respectively). Will has performed a perturbative treatment of the composed black-hole–ring system in the regime of slowly rotating black holes and found the explicit relation Ω{sub H}{sup BH-ring}(J{sub H}=0,J{sub R},R)=2J{sub R}/R{sup 3} for the angular velocity of a central black hole with zero angular momentum, where J{sub R} and R are respectively the angular momentum of the orbiting ring and its proper circumferential radius. Analyzing a sequence of black-hole–ring configurations with adiabatically varying (decreasing) circumferential radii, we show that the expression found by Will for Ω{sub H}{sup BH-ring}(J{sub H}=0,J{sub R},R) implies a smooth transition of the central black-hole angular velocity from its asymptotic near-horizon value Ω{sub H}{sup BH-ring}(J{sub H}=0,J{sub R},R→R{sub H}{sup +})→2J{sub R}/R{sub H}{sup 3} (that is, just before the assimilation of the ring by the central black hole), to its final Kerr (vacuum) value Ω{sub H}{sup Kerr}(J{sub H}{sup new})=J{sub H}{sup new}/2M{sup new2}R{sub H}{sup new} [that is, after the adiabatic assimilation of the ring by the central black hole. Here J{sub H}{sup new}=J{sub R}, M{sup new}, and R{sub H}{sup new} are the new parameters of the resulting Kerr (vacuum) black hole after it assimilated the orbiting ring]. We use this important observation in order to generalize the result of Will to the regime of black-hole–ring configurations in which the

  14. Dragging of inertial frames in the composed black-hole–ring system

    International Nuclear Information System (INIS)

    A well-established phenomenon in general relativity is the dragging of inertial frames by a spinning object. In particular, due to the dragging of inertial frames by a ring orbiting a central black hole, the angular velocity ΩHBH-ring of the black-hole horizon in the composed black-hole–ring system is no longer related to the black-hole angular momentum JH by the simple Kerr-like (vacuum) relation ΩHKerr(JH)=JH/2M2RH (here M and RH are the mass and horizon-radius of the black hole, respectively). Will has performed a perturbative treatment of the composed black-hole–ring system in the regime of slowly rotating black holes and found the explicit relation ΩHBH-ring(JH=0,JR,R)=2JR/R3 for the angular velocity of a central black hole with zero angular momentum, where JR and R are respectively the angular momentum of the orbiting ring and its proper circumferential radius. Analyzing a sequence of black-hole–ring configurations with adiabatically varying (decreasing) circumferential radii, we show that the expression found by Will for ΩHBH-ring(JH=0,JR,R) implies a smooth transition of the central black-hole angular velocity from its asymptotic near-horizon value ΩHBH-ring(JH=0,JR,R→RH+)→2JR/RH3 (that is, just before the assimilation of the ring by the central black hole), to its final Kerr (vacuum) value ΩHKerr(JHnew)=JHnew/2Mnew2RHnew [that is, after the adiabatic assimilation of the ring by the central black hole. Here JHnew=JR, Mnew, and RHnew are the new parameters of the resulting Kerr (vacuum) black hole after it assimilated the orbiting ring]. We use this important observation in order to generalize the result of Will to the regime of black-hole–ring configurations in which the central black holes possess non-zero angular momenta. In particular, it is shown that the continuity argument (namely, the characteristic smooth evolution of the black-hole angular velocity during an adiabatic assimilation process of the ring into the central black hole

  15. Dragging of inertial frames in the composed black-hole-ring system

    International Nuclear Information System (INIS)

    A well-established phenomenon in general relativity is the dragging of inertial frames by a spinning object. In particular, due to the dragging of inertial frames by a ring orbiting a central black hole, the angular velocity ΩHBH-ring of the black-hole horizon in the composed black-hole-ring system is no longer related to the black-hole angular momentum JH by the simple Kerr-like (vacuum) relation ΩHKerr(JH) = JH/2M2RH (here M and RH are the mass and horizon-radius of the black hole, respectively). Will has performed a perturbative treatment of the composed black-hole-ring system in the regime of slowly rotating black holes and found the explicit relation ΩHBH-ring(JH = 0, JR, R) = 2JR/R3 for the angular velocity of a central black hole with zero angular momentum, where JR and R are respectively the angular momentum of the orbiting ring and its proper circumferential radius. Analyzing a sequence of black-hole-ring configurations with adiabatically varying (decreasing) circumferential radii, we show that the expression found by Will for ΩHBH-ring(JH = 0, JR, R) implies a smooth transition of the central black-hole angular velocity from its asymptotic near-horizon value ΩHBH-ring(JH = 0, JR, R → RH+) → 2JR/RH3 (that is, just before the assimilation of the ring by the central black hole), to its final Kerr (vacuum) value ΩHKerr(JHnew)= JHnew/2Mnew2RHnew [that is, after the adiabatic assimilation of the ring by the central black hole. Here JHnew = JR, Mnew, and RHnew are the new parameters of the resulting Kerr (vacuum) black hole after it assimilated the orbiting ring]. We use this important observation in order to generalize the result of Will to the regime of black-hole-ring configurations in which the central black holes possess non-zero angular momenta. In particular, it is shown that the continuity argument (namely, the characteristic smooth evolution of the black-hole angular velocity during an adiabatic assimilation process of the ring into the

  16. Submission of Earth-based ring occultation observations to the NASA planetary data system rings discipline node

    Science.gov (United States)

    French, Richard G.

    1993-01-01

    This is a technical report summarizing our progress in our program of contributing high quality Earth-based occultation observations to NASA's Planetary Data System (PDS) Rings Node. During our first year of funding, we selected five data sets for eventual inclusion in the PDS Rings Node. These were Uranus occultation observations obtained by the PI and co-workers from the IRTF of event stars U34 (26 April 1986), U1052 (5 May 1988), U65 (21 June 1990), U7872 (25 June 1991), and U7808 (28 June 1991). In our original proposal, we described four tasks: data sets to a common format; documentation of the occultation observations and associated calibrations; calculation of the occultation geometry for each event; establish prototype PDS templates. As discussed in our renewal proposal, submitted 8 June 1993, we have completed the first three tasks, and are working on the fourth. As an indication of our progress to date, we provide information about each of the data sets, their formats, the documentation, and the method used for reconstructing the occultation geometry.

  17. Physical studies of heterometallic rings: an ideal system for studying magnetically-coupled systems.

    Science.gov (United States)

    Timco, Grigore A; McInnes, Eric J L; Winpenny, Richard E P

    2013-02-21

    Heterometallic rings of general formula [Cat][M(7)M'F(8)(O(2)C(t)Bu)(8)] (M = a trivalent metal, M' = a divalent metal, cat = a secondary ammonium cation, caesium or rubidium) contain an octagon of metal centres with each metal-metal edge bridged by a fluoride and two carboxylates. The rings when M = Cr(III) give remarkably beautiful EPR and INS spectra, and allow us to examine new techniques. Use of these techniques allows us to study the models used to describe magnetic behaviour in exchange coupled systems. In this tutorial review we discuss the two main approaches to modelling magnetic data - the strong exchange limit and the microscopic Hamiltonian approaches, aiming to explain the major differences between the two approaches. We also describe some more esoteric measurements and theories. PMID:22990593

  18. Solar system history as recorded in the Saturnian ring structure

    Science.gov (United States)

    Alfven, H.

    1983-01-01

    Holberg's analysis of the Voyager Saturn photographs in reflected and transparent light, and occultation data of stars seen through the rings are discussed. A hyperfine structure, with 10,000 ringlets can be explained by the Baxter-Thompson negative diffusion. This gives the ringlets a stability which makes it possible to interpret them as fossils, which originated at cosmogonic times. It is shown that the bulk structure can be explained by the combined cosmogonic shadows of the satellites Mimas, Janus and the Shepherd satellites. This structure originated at the transition from the plasma phase to the planetesimal phase. The shadows are not simple void regions but exhibit a characteristic signature. Parts of the fine structure, explained by Holberg as resonances with satellites, are interpreted as cosmogonic shadow effects. However, there are a number of ringlets which can neither be explained by cosmogonic nor by resonance effects. Analysis of ring data can reconstruct the plasma-planetesimal transition with an accuracy of a few percent.

  19. Voyager Saturnian ring measurements and the early history of the solar system

    Science.gov (United States)

    Alfven, H.; Axnas, I.; Brenning, N.; Lindqvist, P.-A.

    1986-01-01

    The mass distribution in the Saturnian ring system is investigated and compared with predictions from the plasma cosmogony. According to this theory, the matter in the rings has once been in the form of a magnetized plasma, in which the gravitation is balanced partly by the centrifugal force and partly by the electromagnetic forces. As the plasma is neutralized, the electromagnetic forces disappear and the matter can be shown to fall in to 2/3 of the original saturnocentric distance. This causes the so called 'cosmogonic shadow effect', which has been demonstrated earlier for the asteroidal belt and in the large scale structure of the Saturnian ring system. The relevance of the cosmogonic shadow effect is investigated for parts of the fine structures of the Saturnian ring system. It is shown that many structures of the present ring system can be understood as shadows and antishadows of cosmogonic origin. These appear in the form of double rings centered around a position a factor 0.64 (slightly less than 2/3) closer to Saturn than the causing feature. Voyager data agree with an accuracy better than 1 percent.

  20. A progress report on the g-2 storage ring magnet system

    International Nuclear Information System (INIS)

    The 3.1 GeV muon storage ring for the g-2 experiment at Brookhaven National Laboratory hat three large solenoid magnets that form a continuous 1.451 tesla storage ring dipole with an average beam bond radius of 7.1 metors. In addition to the three storage ring solenoids, there is an inflector dipole with nested dipole coils that create very little stray magnetic field. A superconducting shield on the infractor gets rid of most of the remaining stray flux. This paper reports on the progress made on the storage ring solenoid magnet system and the inflector as of June 1995. The results of cryogenic system tests are briefly reported

  1. Simulation of the control system for the KEK main ring power supply-II

    International Nuclear Information System (INIS)

    The tracking error between the magnetic field of the bending magnets and that of the quadrupole magnets is a very important problem of the KEK main ring power supply. Tacking performance is simulated using DDS (Digital Dynamics Simulator) in cases of 8 GeV and 12 GeV operation of the KEK main ring. The results of simulation coincide with the data of actual system. (auth.)

  2. Dynamical states of a system due to localized wake forces in a BEPC storage ring

    CERN Document Server

    Nam, S K; Zhang, C; Kim, E S

    1999-01-01

    We examine the dynamical states of a system in the storage ring of the Beijing electron-positron collider (BEPC) by using an extended model with the combination of a constant wake and a delta wake function. The influences of parameters on the stable equilibrium states and the transitions of the states in the BEPC ring are also investigated by using a new extended model with a constant wake function and a delta wake function.

  3. Photon antibunching and bunching in a ring-resonator waveguide quantum electrodynamics system.

    Science.gov (United States)

    Chen, Zihao; Zhou, Yao; Shen, Jung-Tsung

    2016-07-15

    We numerically investigate the photonic state generation and its nonclassical correlations in a ring-resonator waveguide quantum electrodynamics system. Specifically, we discuss photon antibunching and bunching in various scenarios, including the imperfect resonator with backscattering and dissipations. Our numerical results indicate that an imperfect ring resonator with backscattering can enhance the quality of antibunching. In addition, we also identify the quantum photonic halo phenomenon in the photon scattering dynamics and the shoulder effect in the second-order correlation function. PMID:27420523

  4. Ring retroreflector system consisting of cube-corner reflectors with special coating

    Energy Technology Data Exchange (ETDEWEB)

    Burmistrov, V B; Sadovnikov, M A; Sokolov, A L; Shargorodskiy, V D [OJSC ' PRC ' Precision Systems and Instrument' ' , Moscow (Russian Federation)

    2013-09-30

    The ring retroreflector system (RS) consisting of cubecorner reflectors (CCRs) with a special coating of reflecting surfaces, intended for uniaxially Earth-oriented navigation satellites, is considered. The error of distance measurement caused by both the laser pulse delay in the CCR and its spatial position (CCR configuration) is studied. It is shown that the ring RS, formed by the CCR with a double-spot radiation pattern, allows the distance measurement error to be essentially reduced. (nanogradient dielectric coatings and metamaterials)

  5. Possibility of persistent voltage observation in a system of asymmetric superconducting rings

    International Nuclear Information System (INIS)

    The possibility of observing persistent voltage in superconducting rings of different arm widths is experimentally investigated. It was previously found that switching of the arms between superconducting and normal states by an AC current induces DC voltage oscillation in the magnetic field with a period corresponding to the flux quantum inside the ring. We used systems with a large number of asymmetric rings connected in series to investigate the possibility of observing this quantum phenomenon near the superconducting transition, where thermal fluctuations lead to switching of ring segments without an external influence and the persistent current is much smaller than in the superconducting state. -- Highlights: ► A possibility to observe the persistent voltage is investigated experimentally. ► The persistent voltage is a DC voltage observed at thermodynamic equilibrium. ► It oscillates in magnetic field like the persistent current in superconducting ring. ► The period of the oscillations corresponds to the flux quantum inside the ring. ► The quantum oscillations of the DC voltage were observed on asymmetric rings.

  6. Real time global orbit feedback system for NSLS x-ray ring

    International Nuclear Information System (INIS)

    We report on the design and commissioning of a real time harmonic global orbit feedback system for the NSLS X-ray ring. This system uses 8 pick-up electrode position monitors and 16 trim dipole magnets to eliminate 3 harmonic components of the orbit fluctuations. Because of the larger number of position monitors and trim magnets, the X-ray ring feedback system differs from the previously reported VUV ring system in that the Fourier analysis and harmonic generation networks are comprised of MDAC boards controlled by computer. The implementation of the global feedback system has resulted in a dramatic improvement of orbit stability, by more than a factor of five everywhere. Simultaneous operation of the global and several local bump feedback systems has been achieved. 4 refs., 5 figs

  7. The demise of Phobos and development of a Martian ring system

    Science.gov (United States)

    Black, Benjamin A.; Mittal, Tushar

    2015-12-01

    All of the gas giants in our Solar System host ring systems, in contrast to the inner planets. One proposed mechanism of planetary ring formation is disruption or mass shedding of moons. The orbit of Phobos, the larger of Mars's two moonlets, is gradually spiralling inwards towards Mars and the moon is experiencing increasing tidal stresses. Eventually, Phobos will either break apart to form a ring or it will crash into Mars. We evaluate these outcomes based on geologic, spectral and theoretical constraints, in conjunction with a geotechnical model that helps us determine the strength of Phobos. Our analysis suggests that much of Phobos is composed of weak, heavily damaged materials. We suggest that--with continued inward migration of the moon--the weakest material will disperse tidally in 20 to 40 million years to form a Martian ring. We predict that this ring will persist for 106 to 108 years and will initially have a comparable mass density to that of Saturn's rings. Any large fragment of Phobos that is strong enough to escape tidal breakup will eventually collide with Mars in an oblique, low-velocity impact. Our analysis of the evolution of Phobos underscores the potential orbital and topographic consequences of the growth and self-destruction of other inwardly migrating moons, including those that met their demise early in our Solar System's history.

  8. CAD/CAE system for the ring planetary reducer with small tooth number difference

    Institute of Scientific and Technical Information of China (English)

    谢永春; QI; Shifeng; 等

    2002-01-01

    A CAD/CAE system of the ring-type planetary reducer with small tooth number difference is presented.It is a parameterized CAD/CAE system adopting the object-oriented technique and comprising in itself the geometric feature database(including the modules of ring-plates with ineer te4eth,eccentric shaft modules and output shaft modules),standard componentdatabase and material database.In cdomparison with design by handwork,this computer aided design and analysis system has the advantages of improved quality,shortened design period and reduced cost.The reliability of the system has been verified by a illustrative example.

  9. FNAL main ring to energy save antiproton transfer system for Tevatron I

    International Nuclear Information System (INIS)

    A system for antiproton beam transfer from the Main Ring to the Energy Saver for colliding beam operations has been designed and fabricated. The system is similar to the existing proton beam transfer system used for fixed target operation of the Energy Saver. Using a fast kicker in the Main Ring, one or several bunches of 150 GeV pbars will be kicked horizontally across the septa of two Lambertsons into a short transfer line. At the end of this line, they are injected into the Energy Saver through two more Lambertsons and kicked onto a closed orbit by a second fast kicker. For commissioning and tune-up, the system will be operated in reverse, extracting 150 GeV protons from the Energy Saver to the Main Ring. In addition to a description of the design of the system and its components, the status of the installation and commissioning will also be discussed

  10. Injection System To Damping Ring Of An Electron-positron Injection Complex Vepp5

    CERN Document Server

    Butakov, A I; Podgorny, F V

    2004-01-01

    In this paper elements of an injection system to a damping ring of an injection complex VEPP-5, and a status of work for today also are briefly described. For last year the large work on assembly of the injection system has been done: trial switching on and tests of the system element wise, and work of all elements in common also are made.

  11. Capture, acceleration and bunching rf systems for the MEIC booster and storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Shaoheng [Jefferson Lab, Newport News, VA; Guo, Jiquan [Jefferson Lab, Newport News, VA; Lin, Fanglei [Jefferson Lab, Newport News, VA; Morozov, Vasiliy [Jefferson Lab, Newport News, VA; Rimmer, Robert A. [Jefferson Lab, Newport News, VA; Wang, Haipeng [Jefferson Lab, Newport News, VA; Zhang, Yuhong [Jefferson Lab, Newport News, VA

    2015-09-01

    The Medium-energy Electron Ion Collider (MEIC), proposed by Jefferson Lab, consists of a series of accelerators. The electron collider ring accepts electrons from CEBAF at energies from 3 to 12 GeV. Protons and ions are delivered to a booster and captured in a long bunch before being ramped and transferred to the ion collider ring. The ion collider ring accelerates a small number of long ion bunches to colliding energy before they are re-bunched into a high frequency train of very short bunches for colliding. Two sets of low frequency RF systems are needed for the long ion bunch energy ramping in the booster and ion collider ring. Another two sets of high frequency RF cavities are needed for re-bunching in the ion collider ring and compensating synchrotron radiation energy loss in the electron collider ring. The requirements from energy ramping, ion beam bunching, electron beam energy compensation, collective effects, beam loading and feedback capability, RF power capability, etc. are presented. The preliminary designs of these RF systems are presented. Concepts for the baseline cavity and RF station configurations are described, as well as some options that may allow more flexible injection and acceleration schemes.

  12. BPM System and its Development for the Storage Ring of NSRRC

    CERN Document Server

    Hsu, K T; Hu, K H; Kuo, C H; Lee, D; Wang, C J; Yang, Y T

    2005-01-01

    There are about sixty BPMs installed around the storage ring of NSSRC. High precision closed orbit are measured by Bergoz’s MX-BPMs. Data acquisition is done by multi-channels 16 bits ADC modules. The orbit data is sampled every millisecond. The fast orbit data are shared by reflective memory network to support fast orbit feedback. Averaged data in are update to control system database in 10 Hz rate. Turn-by-turn orbit was measured by several Bergoz’s log-ratio BPMs and was recorded by transient digitizer to support various beam physics study. Digital BPM have been installed at the storage ring to enhance functionality of the BPM system at the storage ring to support routine operation and various beam physics study. Preliminary test of Instrumentation Technologies’ Libera is on going. The system structure, software environment and performance of BPM system will be summary in this report.

  13. Auto-production of biosurfactants reverses the coffee ring effect in a bacterial system

    Science.gov (United States)

    Sempels, Wouter; de Dier, Raf; Mizuno, Hideaki; Hofkens, Johan; Vermant, Jan

    2013-04-01

    The deposition of material at the edge of evaporating droplets, known as the ‘coffee ring effect’, is caused by a radially outward capillary flow. This phenomenon is common to a wide array of systems including colloidal and bacterial systems. The role of surfactants in counteracting these coffee ring depositions is related to the occurrence of local vortices known as Marangoni eddies. Here we show that these swirling flows are universal, and not only lead to a uniform deposition of colloids but also occur in living bacterial systems. Experiments on Pseudomonas aeruginosa suggest that the auto-production of biosurfactants has an essential role in creating a homogeneous deposition of the bacteria upon drying. Moreover, at biologically relevant conditions, intricate time-dependent flows are observed in addition to the vortex regime, which are also effective in reversing the coffee ring effect at even lower surfactant concentrations.

  14. Design for ANL 7 GeV storage ring vacuum system

    International Nuclear Information System (INIS)

    The 7-GeV Advanced Photon Source (APS) design includes a storage ring having a 1060-m circumference with the capability of accommodating 34 insertion devices (ID) and their associated photon beam lines. An additional 35 photon lines can be provided from bending magnets. The vacuum system for the storage ring is designed to maintain a beam-on operating pressure of 1n Torr or less to achieve a positron beam lifetime of approximately 20 hours. The vacuum system and it's current developmental status are described

  15. READOUT SYSTEM FOR ARRAYS OF FRISCH-RING CdZnTe DETECTORS

    International Nuclear Information System (INIS)

    Frisch-ring CdZnTe detectors have demonstrated good energy resolution for identifying isotopes, 3 Frisch-ring detectors, coupled with a readout electronics system. It supports 64 readout channels, and includes front-end electronics, signal processing circuit, USB interface and high-voltage power supply. The data-acquisition software is used to process the data stream, which includes amplitude and timing information for each detected event. This paper describes the design and assembly of the detector modules, readout electronics, and a conceptual prototype system. Some test results are also reported

  16. Present status of development of damping ring extraction kicker system for CLIC

    CERN Document Server

    Holma, Janne; Belver-Aguilar, Caroline; Faus-Golfe, Angeles; Toral, Fernando

    2012-01-01

    The CLIC damping rings will produce ultra-low emittance beam, with high bunch charge, necessary for the luminosity performance of the collider. To limit the beam emittance blow-up due to oscillations, the pulse power modulators for the damping ring kickers must provide extremely flat, high-voltage pulses: specifications call for a 160 ns duration and a flattop of 12.5 kV, 250 A, with a combined ripple and droop of not more than \\pm0.02 %. The stripline design is also extremely challenging: the field for the damping ring kicker system must be homogenous to within \\pm0.01 % over a 1 mm radius, and low beam coupling impedance is required. The solid-state modulator, the inductive adder, is a very promising approach to meeting the demanding specifications for the field pulse ripple and droop. This paper describes the initial design of the inductive adder and the striplines of the kicker system.

  17. Present status of development of damping ring extraction kicker system for CLIC

    CERN Document Server

    Holma, Janne; Belver-Aguilar, Caroline; Faus-Golfe, Angeles; Toral, Fernando

    2012-01-01

    The CLIC damping rings will produce ultra-low emittance beam, with high bunch charge, necessary for the luminosity performance of the collider. To limit the beam emittance blow-up due to oscillations, the pulse power modulators for the damping ring kickers must provide extremely flat, high-voltage pulses: specifications call for a 160 ns duration and a flattop of 12.5 kV, 250 A, with a combined ripple and droop of not more than ±0.02 %. The stripline design is also extremely challenging: the field for the damping ring kicker system must be homogenous to within ±0.01 % over a 1 mm radius, and low beam coupling impedance is required. The solid-state modulator, the inductive adder, is a very promising approach to meeting the demanding specifications for the field pulse ripple and droop. This paper describes the initial design of the inductive adder and the striplines of the kicker system.

  18. Configuration maintaining control of three-body ring tethered system based on thrust compensation

    Science.gov (United States)

    Huang, Panfeng; Liu, Binbin; Zhang, Fan

    2016-06-01

    Space multi-tethered systems have shown broad prospects in remote observation missions. This paper mainly focuses on the dynamics and configuration maintaining control of space spinning three-body ring tethered system for such mission. Firstly, we establish the spinning dynamic model of the three-body ring tethered system considering the elasticity of the tether using Newton-Euler method, and then validate the suitability of this model by numerical simulation. Subsequently, LP (Likins-Pringle) initial equilibrium conditions for the tethered system are derived based on rigid body's equilibrium theory. Simulation results show that tether slack, snapping and interaction between the tethers exist in the three-body ring system, and its' configuration can not be maintained without control. Finally, a control strategy based on thrust compensation, namely thrust to simulate tether compression under LP initial equilibrium conditions is designed to solve the configuration maintaining control problem. Control effects are verified by numerical simulation compared with uncontrolled situation. Simulation results show that the configuration of the three-body ring tethered system could maintain under this active control strategy.

  19. Up gradation of control system for RF subsystems of booster synchrotron and Indus-1 storage ring

    International Nuclear Information System (INIS)

    Indus-1 is a 450 MeV Synchronous radiation source at Raja Ramanna Center for Advanced Technology Indore. Booster Synchrotron was commissioned in 1995 and Indus-1 storage ring in 1999. Presently 6 beam lines are being used in round the clock mode, which are commissioned over the period. Indus-1 is comprises of many subsystems like Radio Frequency, Magnet Power Supplies, Pulsed Power Supplies, Vacuum System, Radiation Monitoring system and Low Conductive Water cooling system. All subsystems are connected to main control room by dedicated control systems. These control systems are Versa Module Europa bus (VMEbus) based systems and being operated since commissioning of Booster and Indus-l rings. This paper high lights the new features of developed hardware for Control System of Indus-1 RF

  20. Vacuum system for the Stanford-LBL storage ring (PEP)

    International Nuclear Information System (INIS)

    The vacuum system for PEP will be similar in design, construction and operation to the system currently in operation at SPEAR. There will, of course, be quantitative differences since the closed path of PEP will be 10 times longer than the SPEAR path. Some qualitative differences will also arise since the radiated synchrotron power for PEP will be about 13 times greater than for SPEAR giving rise to an increased linear power density incident on the chamber wall. Other differences arise from the higher energy spectrum of the synchrotron radiation. The SPEAR vacuum system has been in operation since April 1972 and has proven satisfactory in design, construction and operation. The chamber has been subject to synchrotron radiation for approximately 300 ampere-hours and beam lifetimes are now more than several hours. The details of the PEP design and the SPEAR operating experience will be further discussed in this paper. 1 ref., 4 figs

  1. A laser system for the TESLA photon collider based on an external ring resonator

    CERN Document Server

    Will, I; Redlin, H; Sandner, W

    2001-01-01

    We present a concept of a laser system for a photon collider at the TESLA linac. It is based on an external optical ring cavity which is pumped by a short-pulse laser. A detailed discussion of the geometry of the external cavity is given.

  2. O-ring tube fittings form leakproof seal in hydraulic systems

    Science.gov (United States)

    1966-01-01

    Leakproof fittings for hydraulic systems are designed to be welded to the ends of the tubing to be joined and mated to form a seal with one o-ring at the joint. Since the fittings are coupled at only one joint, they tend to be more reliable than standard fittings coupled at two joints.

  3. Design and Analysis of Drive System with Slip Ring Induction Motor for Electric Traction in India

    Directory of Open Access Journals (Sweden)

    Nagamani Chandra sekara

    2015-02-01

    Full Text Available The use of Squirrel Cage for Traction has revolutionised the motive power of a Locomotive. The Asynchronous Motor is rugged with high starting Torque, has a very smooth Voltage and Speed control as compared to a DC Series Motor. When looking at the Traction perspective, a Slip Ring Induction Motor can be an alternative to the Squirrel Cage Motor as it has higher starting Torque and better efficiency than a Squirrel Cage Motor. the Slip Power Recovery scheme also plays a proactive role as ther can be substantial savings of energy in case of a Slip Ring Induction Motor. A detailed design and analysis of a Drive System with Slip Ring Induction Motor for Electric Traction is presented in this Research Paper

  4. The Kula Ring of Bronislaw Malinowski: Co-evolution of an Economic and Ceremonial Exchange System

    OpenAIRE

    Rolf Ziegler

    2012-01-01

    The Kula Ring described by Bronislaw Malinowski is a system of the ceremonial exchange of gifts among a number of tribal societies inhabiting various island groups in the region east of Papua New Guinea. Two ceremonial gifts continually circulate in opposi¬te directions: necklaces clockwise and armshells counterclock¬wise. After a brief description of the social system of Kula exchange, a game-theoretic interpretation of the ceremonial exchange as a signaling system for peaceful relationships...

  5. A betatron tune measurement system based on bunch-by-bunch transverse feedback at the Duke storage ring

    Science.gov (United States)

    Xu, Wei; Z. Wu, W.; Li, Jing-Yi; He, Duo-Hui; K. Wu, Y.

    2013-07-01

    To combat electron beam instabilities, a digital bunch-by-bunch transverse feedback (TFB) system has been developed for the Duke storage ring. While it is capable of suppressing transverse beam instabilities for multibunch operation, the TFB system has not been needed for typical operation of the Duke storage ring. To explore the great potential of this system, we have developed beam diagnostic techniques using the TFB, in particular, the TFB based tune measurement techniques. The tune measurement technique allows us to conduct fast chromaticity measurements, compared with the existing chromaticity measurement system using a network analyzer. This new tune measurement system also enables us to measure the bunch tune for multibunch operation of the Duke storage ring. With the TFB based tune measurement system, we have studied the tune stability of the electron beam in the Duke storage ring. This tune system has also been used to calibrate the tune knob for the Duke storage ring.

  6. The control system for the dedicated synchrotron radiation storage ring BESSY

    International Nuclear Information System (INIS)

    BESSY is a 800 MeV electron-storage ring dedicated to research with synchrotron radiation in the VUV and soft X-ray region. The storage ring is fed by a 800 MeV separated function synchrotron with a clasical 20 MeV microtron as preinjector. The machines are remotely controlled by four minicomputers which are linked by a local network. The computers are connected to a commercially available electronic interface system. The general philosophy for the system design was determined by boundary conditions such as reliable processor hardware, reliable and powerful multi-user multi-programming real-time operating systems, well developed software tools, a ready-to-use distributed network with high throughput, compatibility of the electronic interface system, locally available service shops, and, if possible, the avoidance of assembly coding. This paper describes in detail the system which ultimately met these criteria and was subsequently implemented at BESSY

  7. Tissue culture system using a PANDA ring resonator and wavelength router for hydroponic plant.

    Science.gov (United States)

    Kamoldilok, Surachart; Suwanpayak, Nathaporn; Suttirak, Saisudawan; Yupapin, Preecha P

    2012-06-01

    A novel system of nanofluidics trapping and delivery, which is known as a tissue culture system is proposed. By using the intense optical pulse(i.e., a soliton pulse) and a system constructed by a liquid core waveguide, the optical vortices (gradient optical fields/wells) can be generated, where the trapping tools in the same way as the optical tweezers in the PANDA ring resonator can be formed. By controlling the suitable parameters, the intense optical vortices can be generated within the PANDA ring resonator, in which the nanofluidics can be trapped and moved (transported) dynamically within the Tissue culture system(a wavelength router), which can be used for tissue culture and delivery in the hydroponic plant system. PMID:22411055

  8. An innovative seismic bracing system based on a superelastic shape memory alloy ring

    Science.gov (United States)

    Gao, Nan; Jeon, Jong-Su; Hodgson, Darel E.; DesRoches, Reginald

    2016-05-01

    Shape memory alloys (SMAs) have great potential in seismic applications because of their remarkable superelasticity. Seismic bracing systems based on SMAs can mitigate the damage caused by earthquakes. The current study investigates a bracing system based on an SMA ring which is capable of both re-centering and energy dissipation. This lateral force resisting system is a cross-braced system consisting of an SMA ring and four tension-only cable assemblies, which can be applied to both new construction and seismic retrofit. The performance of this bracing system is examined through a quasi-static cyclic loading test and finite element (FE) analysis. This paper describes the experimental design in detail, discusses the experimental results, compares the performance with other bracing systems based on SMAs, and presents an Abaqus FE model calibrated on the basis of experimental results to simulate the superelastic behavior of the SMA ring. The experimental results indicate that the seismic performance of this system is promising in terms of damping and re-centering. The FE model can be used in the simulation of building structures using the proposed bracing system.

  9. Stability Analysis of a Turbocharger Rotor System Supported on Floating Ring Bearings

    Science.gov (United States)

    Zhang, H.; Shi, Z. Q.; Zhen, D.; Gu, F. S.; Ball, A. D.

    2012-05-01

    The stability of a turbocharger rotor is governed by the coupling of rotor dynamics and fluid dynamics because the high speed rotor system is supported on a pair of hydrodynamic floating ring bearings which comprise of inner and outer fluid films in series. In order to investigate the stability, this paper has developed a finite element model of the rotor system with consideration of such exciting forces as rotor imbalance, hydrodynamic fluid forces, lubricant feed pressure and dead weight. The dimensionless analytical expression of nonlinear oil film forces in floating ring bearings have been derived on the basis of short bearing theory. Based on numerical simulation, the effects of rotor imbalance, lubricant viscosity, lubricant feed pressure and bearing clearances on the stability of turbocharger rotor system have been studied. The disciplines of the stability of two films and dynamic performances of rotor system have been provided.

  10. Stability Analysis of a Turbocharger Rotor System Supported on Floating Ring Bearings

    International Nuclear Information System (INIS)

    The stability of a turbocharger rotor is governed by the coupling of rotor dynamics and fluid dynamics because the high speed rotor system is supported on a pair of hydrodynamic floating ring bearings which comprise of inner and outer fluid films in series. In order to investigate the stability, this paper has developed a finite element model of the rotor system with consideration of such exciting forces as rotor imbalance, hydrodynamic fluid forces, lubricant feed pressure and dead weight. The dimensionless analytical expression of nonlinear oil film forces in floating ring bearings have been derived on the basis of short bearing theory. Based on numerical simulation, the effects of rotor imbalance, lubricant viscosity, lubricant feed pressure and bearing clearances on the stability of turbocharger rotor system have been studied. The disciplines of the stability of two films and dynamic performances of rotor system have been provided.

  11. ``Ring monitoring system`` - a new concept for gamma dose rate monitoring shown on the example of the nuclear power plant Pilgrim Station; ``Ring Monitoring System`` - ein neues ODL-Ueberwachungskonzept, dargestellt am Beispiel des Kernkraftwerks Pilgrim Station

    Energy Technology Data Exchange (ETDEWEB)

    Holzheimer, C. [Hoermann Systemtechnik GmbH, Kirchseeon/Muenchen (Germany); Kristl, H. [Hoermann Systemtechnik GmbH, Kirchseeon/Muenchen (Germany)

    1994-12-31

    The `Ring Monitoring System` represents a measurement and alerting system for the supervision of gamma dose rate in the vicinity of a nuclear power plant. This system especially meets the customer demand for direct and continuous access upon the monitoring stations from different central computer systems. (orig.) [Deutsch] Mit dem `Ring Monitoring System` wurde ein Gammadosisleistungs-Messsystem zur Ueberwachung eines Kernkraftwerkes realisiert, welches vor allem der Kundenforderung nach direktem und kontinuierlichem Zugriff auf die Messstationen von verschiedenen Auswertezentralen aus gerecht wird. (orig.)

  12. Photometric and spectroscopic evidence for a dense ring system around Centaur Chariklo

    CERN Document Server

    Duffard, R; Ortiz, J L; Alvarez-Candal, A; Sicardy, B; Santos-Sanz, P; Morales, N; Colazo, C; Fernández-Valenzuela, E; Braga-Ribas, F

    2014-01-01

    In this work we aim to study if the variability in the absolute magnitude of Chariklo and the temporal variation of the spectral ice feature, even its disappearance in 2007, can be explained by an icy ring system whose aspect angle changes with time. We modeled the light reflected by a system as the one described above to explain the variations on the absolute magnitude of Chariklo and its rings. Using X-Shooter at VLT we obtained a new reflectance spectra, here we compared this new set of data with the ones available in the literature. We showed how the water ice feature is visible in 2013 in accordance with the ring configuration, which had an opening angle of nearly 34$^o$ in 2013. Finally we also used models of the scattering of light to fit the visible and near-infrared spectra showing different characteristic to obtain information on the composition of Chariklo and its rings. {We showed that past absolute photometry of Chariklo from the literature and new photometric data that we obtained in 2013 can be...

  13. Stability Analysis of a Turbocharger Rotor System Supported on Floating Ring Bearings

    OpenAIRE

    Zhang, Hongyu; Shi, Zhanqun; Zhen, Dong; Gu, Fengshou; Ball, Andrew

    2012-01-01

    The stability of a turbocharger rotor is governed by the coupling of rotor dynamics and fluid dynamics because the high speed rotor system is supported on a pair of hydrodynamic floating ring bearings which comprise of inner and outer fluid films in series. In order to investigate the stability, this paper has developed a finite element model of the rotor system with consideration of such exciting forces as rotor imbalance, hydrodynamic fluid forces, lubricant feed pressure and dead weight. T...

  14. Formation of Regular Satellites from Ancient Massive Rings in the Solar System

    OpenAIRE

    Crida, A.; Charnoz, S.

    2013-01-01

    When a planetary tidal disk -like Saturn's rings- spreads beyond the Roche radius (inside which planetary tides prevent aggregation), satellites form and migrate away. Here, we show that most regular satellites in the solar system probably formed in this way. According to our analytical model, when the spreading is slow, a retinue of satellites appear with masses increasing with distance to the Roche radius, in excellent agreement with Saturn's, Uranus', and Neptune's satellite systems. This ...

  15. Human identification system based on the detection of optical Disc Ring in retinal images

    OpenAIRE

    Chihaoui, Takwa; Kachouri, Rostom; Jlassi, Hejer; Akil, Mohamed; Hamrouni, Kamel

    2015-01-01

    Retinal identification is being studied as a hot research topic in the biometric field. Many factors such as the poor quality of retinal images and the huge execution time can seriously affect the performance of the retinal identification systems. In this context, in order to compromise the quality and the processing time, this paper presents a human identification system based on a new preprocessing method of retinal images that we call optical Disc Ring detection method. The proposed ODR me...

  16. Determinantal rings

    CERN Document Server

    Bruns, Winfried

    1988-01-01

    Determinantal rings and varieties have been a central topic of commutative algebra and algebraic geometry. Their study has attracted many prominent researchers and has motivated the creation of theories which may now be considered part of general commutative ring theory. The book gives a first coherent treatment of the structure of determinantal rings. The main approach is via the theory of algebras with straightening law. This approach suggest (and is simplified by) the simultaneous treatment of the Schubert subvarieties of Grassmannian. Other methods have not been neglected, however. Principal radical systems are discussed in detail, and one section is devoted to each of invariant and representation theory. While the book is primarily a research monograph, it serves also as a reference source and the reader requires only the basics of commutative algebra together with some supplementary material found in the appendix. The text may be useful for seminars following a course in commutative ring theory since a ...

  17. Magnetic measurement system for cooling storage ring of heavy ion research facility in Lanzhou

    International Nuclear Information System (INIS)

    Magnetic measurement system is an indispensable part of National Scientific Major-project Cooling Storage Ring of Heavy Ion Research Facility in Lanzhou (HIRFL-CSR). Three measurement systems, Hall probe mapping, integral coils and harmonic coils system were developed. The structure and parameters of main devices were described in details in the paper. And the manufacturing technics and the checking results were also involved. By means of a long time repeat testing, it is proved that the repeatability and stability of the systems match the requirements of CSR. The systems are applying in CSR project now. (author)

  18. Design of the Injection and extraction system and related machine protection for the Clic Damping Rings

    CERN Document Server

    Apsimon, Robert; Barnes, Mike; Borburgh, Jan; Goddard, Brennan; Papaphilippou, Yannis; Uythoven, Jan

    2014-01-01

    Linear machines such as CLIC have relatively low rates of collision between bunches compared to their circular counterparts. In order to achieve the required luminosity, a very small spot size is envisaged at the interaction point, thus a low emittance beam is needed. Damping rings are essential for producing the low emittances needed for the CLIC main beam. It is crucial that the beams are injected and extracted from the damping rings in a stable and repeatable fashion to minimise emittance blow-up and beam jitter at the interaction point; both of these effects will deteriorate the luminosity at the interaction point. In this paper, the parameters and constraints of the injection and extraction systems are considered and the design of these systems is optimised within this parameter space. Related machine protection is considered in order to prevent damage from potential failure modes of the injection and extraction systems.

  19. Formation of Regular Satellites from Ancient Massive Rings in the Solar System

    CERN Document Server

    Crida, A; 10.1126/science.1226477

    2013-01-01

    When a planetary tidal disk -like Saturn's rings- spreads beyond the Roche radius (inside which planetary tides prevent aggregation), satellites form and migrate away. Here, we show that most regular satellites in the solar system probably formed in this way. According to our analytical model, when the spreading is slow, a retinue of satellites appear with masses increasing with distance to the Roche radius, in excellent agreement with Saturn's, Uranus', and Neptune's satellite systems. This suggests that Uranus and Neptune used to have massive rings that disappeared to give birth to most of their regular satellites. When the spreading is fast, only one large satellite forms, as was the case for Pluto and Earth. This conceptually bridges the gap between terrestrial and giant planet systems.

  20. Controllable multiple-quantum transitions in a T-shaped small quantum dot-ring system

    Science.gov (United States)

    Chen, Xiongwen; Chen, Baoju; Song, Kehui; Zhou, Guanghui

    2016-05-01

    Based on the tight-binding model and the slave boson mean field approximation, we investigate the electron transport properties in a small quantum dot (QD)-ring system. Namely, a strongly correlated QD not only attaches directly to two normal metallic electrodes, but also forms a magnetic control Aharonov-Bohm quantum ring with a few noninteracting QDs. We show that the parity effect, the Kondo effect, and the multiple Fano effects coexist in our system. Moreover, the parities, defined by the odd- and even-numbered energy levels in this system, can be switched by adjusting magnetic flux phase ϕ located at the center of the quantum ring, which induces multiple controllable Fano-interference energy pathways. Therefore, the constructive and destructive multi-Fano interference transition, the Kondo and Fano resonance transition at the Fermi level, the Fano resonance and ani-resonance transition are realized in the even parity system. They can also be observed in the odd parity system when one adjusts the phase ϕ and the gate voltage Vg applied to the noninteracting QDs. The multi-quantum transitions determine some interesting transport properties such as the current switch and its multi-flatsteps, the differential conductance switch at zero bias voltage and its oscillation or quantization at the low bias voltage. These results may be useful for the observation of multiple quantum effect interplays experimentally and the design of controllable QD-based device.

  1. A New Family of Topological Rings with Applications in Linear System Theory

    CERN Document Server

    Alpay, Daniel

    2011-01-01

    Motivated by the Schwartz space of tempered distributions $\\mathscr S^\\prime$ and the Kondratiev space of stochastic distributions $\\mathcal S_{-1}$ we define a wide family of nuclear spaces which are increasing unions of (duals of) Hilbert spaces $\\mathscr H_p^\\prime,p\\in\\mathbb N$, with decreasing norms $\\|\\cdot\\|_p$. The elements of these spaces are functions on a free commutative monoid. We characterize those rings in this family which satisfy an inequality of the form $\\|f \\diamond g\\|_{p} \\leq A(p-q) \\|f\\|_{q}\\|g\\|_{p}$ for all $p\\ge q+d$, where $\\diamond$ denotes the convolution in the monoid, $A(p-q)$ is a strictly positive number and $d$ is a fixed natural number (in this case we obtain commutative topological rings). Such an inequality holds in $\\mathcal S_{-1}$, but not in $\\mathscr S^\\prime$. We give an example of such a ring which contains $\\mathscr S^\\prime$. We characterize invertible elements in these rings and present applications to linear system theory.

  2. Synchronisation of fractional-order time delayed chaotic systems with ring connection

    Science.gov (United States)

    He, S.; Sun, K.; Wang, H.

    2016-02-01

    In this paper, synchronisation of fractional-order time delayed chaotic systems in ring networks is investigated. Based on Lyapunov stability theory, a new generic synchronisation criterion for N-coupled chaotic systems with time delay is proposed. The synchronisation scheme is applied to N-coupled fractional-order time delayed simplified Lorenz systems, and the Adomian decomposition method (ADM) is developed for solving these chaotic systems. Performance analysis of the synchronisation network is carried out. Numerical experiments demonstrate that synchronisation realises in both state variables and intermediate variables, which verifies the effectiveness of the proposed method.

  3. Position and rotation-invariant pattern recognition system by binary rings masks

    Science.gov (United States)

    Solorza, S.; Álvarez-Borrego, J.

    2015-06-01

    In this paper, algorithms invariant to position, rotation, noise and non-homogeneous illumination are presented. Here, several manners are studied to generate binary rings mask filters and the corresponding signatures associated to each image. Also, in this work it is shown that digital systems, which are based on the ?-law non-linear correlation, are ?-invariant for ?. The methodologies are tested using greyscale fossil diatoms digital images (real images), and considering the great similarity between those images the results obtained are excellent. The box plot statistical analysis and the computational cost times yield that the Bessel rings masks are the best option when the images contain a homogeneous illumination and the Fourier masks digital system is the right selection when the non-homogeneous illumination and noise is presented in the images.

  4. Hepatopancreatic arterial ring: bilateral symmetric typology in human celiaco-mesenteric arterial system.

    Directory of Open Access Journals (Sweden)

    Kosaka M

    2002-10-01

    Full Text Available The celiac and mesenteric arterial system including the left gastric, splenic, common hepatic, and superior mesenteric arteries shows various types of origins, courses, ramifications and anastomoses. In order to explain the various expressions of this system, we have proposed a typological model, in which celiacomesenteric arteries develop as paired or bilaterally symmetrical primordial vessels originated from the anterior aspect of the aorta, and these vessels anastomose each other with longitudinal and horizontal pathways. Here, we report 3 unusual cases characterized by arterial rings, formed by the left gastric, left accessory hepatic, proper hepatic, anterior pancreaticoduodenal, and dorsal pancreatic arteries. The dorsal pancreatic and anterior pancreaticoduodenal arteries are located to the right and left of the embryonic pancreas developing in the dorsal mesentery, respectively. Such hepatopancreatic arterial rings simultaneously containing right and left elements can only be explained using our typological model, in which the concept of paired arteries or bilateral symmetry is introduced.

  5. Hepatopancreatic arterial ring: bilateral symmetric typology in human celiaco-mesenteric arterial system.

    Science.gov (United States)

    Kosaka, Motohiro; Horiuchi, Kanji; Nishida, Keiichiro; Taguchi, Takehito; Murakami, Takuro; Ohtsuka, Aiji

    2002-10-01

    The celiac and mesenteric arterial system including the left gastric, splenic, common hepatic, and superior mesenteric arteries shows various types of origins, courses, ramifications and anastomoses. In order to explain the various expressions of this system, we have proposed a typological model, in which celiacomesenteric arteries develop as paired or bilaterally symmetrical primordial vessels originated from the anterior aspect of the aorta, and these vessels anastomose each other with longitudinal and horizontal pathways. Here, we report 3 unusual cases characterized by arterial rings, formed by the left gastric, left accessory hepatic, proper hepatic, anterior pancreaticoduodenal, and dorsal pancreatic arteries. The dorsal pancreatic and anterior pancreaticoduodenal arteries are located to the right and left of the embryonic pancreas developing in the dorsal mesentery, respectively. Such hepatopancreatic arterial rings simultaneously containing right and left elements can only be explained using our typological model, in which the concept of paired arteries or bilateral symmetry is introduced. PMID:12530508

  6. Experimental study on high-voltage nanosecond generators of the 'Sibir'-2' storage ring injection system

    International Nuclear Information System (INIS)

    Results of the investigation of operating modes of pulse generators of the injection system of the 'Sibir'-2' storage ring the synchrotron radiation source are presented. Generators are constructed as coaxial type double-shaping lines with the control via the gas-filled three-electrode spark gaps. Test results revealed, that generators meet the requirements to output voltage of up to 60 kw, pulse rise time of about 3 ns and timing stability. 1 ref., 3 figs

  7. Equation of spin motion in storage rings in a cylindrical coordinate system

    OpenAIRE

    Silenko, A. J.

    2004-01-01

    The exact equation of spin motion in a cylindrical coordinate system with allowance for electric dipole moments of particles has been derived. This equation is convenient for analytical calculations of spin dynamics in circular storage rings when the configuration of main fields is simple enough. The generalized formula for the influence of a vertical betatron oscillation on the angular velocity of spin rotation has been found. This formula agrees with the previously obtained result and conta...

  8. Six-membered ring systems: with O and/or S atoms

    OpenAIRE

    Santos, Clementina M.M.; Silva, Artur

    2012-01-01

    A large variety of publications have emerged in 2012 involving O- and S-6- membered ring systems. The increasing number of reviews and other communica- tions dedicated to natural and synthetic derivatives and their biological significance highlights the importance of these heterocycles. Reviews on natural products involve biosynthesis and isolation of enantiomeric derivatives h12AGE4802i, biosynthesis, isolation, synthesis, and biological studies on the pederin family h12NPR...

  9. Investigation into nonlinear dynamics of rotor-floating ring bearing systems in automotive turbochargers

    OpenAIRE

    Tian, Liang

    2012-01-01

    As a high speed rotating device, a modern turbocharger rotor is commonly supported by floating ring bearings (FRBs), owing to their cost effectiveness for mass production and good damping performance. Thanks to the rapid growth of the power of the modern computer, rotordynamic analysis of turbocharger rotor-bearing systems becomes feasible, and it is closely related to the healthy operation and noise generation of turbochargers. The work in this thesis is concerned with the nonlinear rotordyn...

  10. Fiber optic communications links for the Main Ring control system upgrade

    International Nuclear Information System (INIS)

    Fiber optic communication links have been implemented throughout the 6.5 km circumference of the Fermilab accelerator facility in support of the upgrade of the Main Ring Control System. The choice of optical fiber as a communication medium was based on cost and limited plant capacity for additional conventional copper based medium, rather than by the inherent advantages of high bandwidth and low loss. Details of component selection and performance of the custom designed repeater facilities are discussed

  11. Ring Theory

    CERN Document Server

    Jara, Pascual; Torrecillas, Blas

    1988-01-01

    The papers in this proceedings volume are selected research papers in different areas of ring theory, including graded rings, differential operator rings, K-theory of noetherian rings, torsion theory, regular rings, cohomology of algebras, local cohomology of noncommutative rings. The book will be important for mathematicians active in research in ring theory.

  12. Linear and nonlinear optical susceptibilities in a laterally coupled quantum-dot–quantum-ring system

    International Nuclear Information System (INIS)

    Linear and nonlinear optical susceptibilities in a laterally coupled quantum-dot–quantum-ring system have been theoretically studied. In general, we find that the structure parameters of the coupled system significantly affect the optical susceptibilities. The enhancement of the coupling effects between the dot and ring is found to increase considerably the optical susceptibilities and redshift drastically the transition energies. Comparing to the linear susceptibility, the nonlinear optical susceptibility is found to be more sensitive to the variation of the structure parameters. A comprehensive analysis of the electron probability density movement with respect to the modification of the structure parameters is provided, which offers a unique perspective of the ground-state localization. - Highlights: • Optical susceptibilities in a quantum-dot–quantum-ring system are studied. • The structure parameters significantly affect the optical susceptibilities. • The enhancement of the coupling effects increases the optical susceptibilities. • The nonlinear susceptibility is more sensitive to the change in structure parameters. • A comprehensive analysis of the electron probability density movement is provided

  13. Simulation and Analysis of Multisoliton Generation Using a PANDA Ring Resonator System

    Institute of Scientific and Technical Information of China (English)

    I. S. Amiri; A. Afroozeh; M. Bahadoran

    2011-01-01

    A novel system of multisoliton generation using nonlinear equations of the propagating signals is presented.This system uses a PANDA ring resonator incorporated with an add/drop filter system.Using resonant conditions,the intense optical fields known as multisolitons can be generated and propagated within a Kerr-type nonlinear medium.The present simulation results show that multisolitons can be controlled by using additional Gaussian pulses input into the add port of the PANDA system.For the soliton pulse in the microring device,a balance should be achieved between dispersion and nonlinear lengths.Chaotic output signals from the PANDA ring resonator are input into the add/drop filter system.Chaotic signals can be filtered by using the add/drop filter system,in which multi dark and bright solitons can be generated.In this work multi dark and bright solitons with an FWHM and an FSR of 425pm and 1.145nm are generated,respectively,where the Gaussian pulse with a central wavelength of 1.55 μm and power of 600mW is input into the system.The generation of multisolitons becomes an interesting subject when it is used to enlarge the capacity of communication channels.[1] The high optical output of the ring resonator system is of benefit to long distance communication links.[2] Two techniques can be used to generate soliton pulses.First,soliton pulses can be obtained using a ring resonator system where large amplified signals are achieved.Second,a Gaussian soliton can be generated in a simple system arrangement.[3]This application becomes an attractive tool in the area of photonics for soliton generation and investigation.%A novel system of multisoliton generation using nonlinear equations of the propagating signals is presented. This system uses a PANDA ring resonator incorporated with an add/drop filter system. Using resonant conditions, the intense optical fields known as multisolitons can be generated and propagated within a Kerr-type nonlinear medium. The present

  14. Digital closed orbit feedback system for the advanced photon source storage ring

    International Nuclear Information System (INIS)

    The Advanced Photon Source (APS) is a dedicated third-generation synchrotron light source with a nominal energy of 7 GeV and a circumference of 1104 m. The closed orbit feedback system for the APS storage ring employs unified global and local feedback systems for stabilization of particle and photon beams based on digital signal processing (DSP). Hardware and software aspects of the system will be described in this paper. In particular, we will discuss global and local orbit feedback algorithms, PID (proportional, integral, and derivative) control algorithm, application of digital signal processing to compensate for vacuum chamber eddy current effects, resolution of the interaction between global and local systems through decoupling, self-correction of the local bump closure error, user interface through the APS control system, and system performance in the frequency and time domains. The system hardware including the DSPs is distributed in 20 VME crates around the ring, and the entire feedback system runs synchronously at 4-kHz sampling frequency in order to achieve a correction bandwidth exceeding 100 Hz. The required data sharing between the global and local feedback systems is facilitated via the use of fiber-optically-networked reflective memories

  15. Digital closed orbit feedback system for the advanced photon source storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Chung, Y.; Barr, D.; Decker, G. [and others

    1995-12-31

    The Advanced Photon Source (APS) is a dedicated third-generation synchrotron light source with a nominal energy of 7 GeV and a circumference of 1104 m. The closed orbit feedback system for the APS storage ring employs unified global and local feedback systems for stabilization of particle and photon beams based on digital signal processing (DSP). Hardware and software aspects of the system will be described in this paper. In particular, we will discuss global and local orbit feedback algorithms, PID (proportional, integral, and derivative) control algorithm, application of digital signal processing to compensate for vacuum chamber eddy current effects, resolution of the interaction between global and local systems through decoupling, self-correction of the local bump closure error, user interface through the APS control system, and system performance in the frequency and time domains. The system hardware including the DSPs is distributed in 20 VME crates around the ring, and the entire feedback system runs synchronously at 4-kHz sampling frequency in order to achieve a correction bandwidth exceeding 100 Hz. The required data sharing between the global and local feedback systems is facilitated via the use of fiber-optically-networked reflective memories.

  16. Monitor and control systems for the SLD Cherenkov Ring Imaging Detector

    International Nuclear Information System (INIS)

    To help ensure the stable long-term operation of a Cherenkov Ring Detector at high efficiency, a comprehensive monitor and control system is being developed. This system will continuously monitor and maintain the correct operating temperatures, and will provide an on-line monitor and maintain the correct operating temperatures, and will provide an on-line monitor of the pressures, flows, mixing, and purity of the various fluids. In addition the velocities and trajectories of Cherenkov photoelectrons drifting within the imaging chambers will be measured using a pulsed uv lamp and a fiberoptic light injection system. 9 refs., 6 figs

  17. Commissioning and Early Operation Experience of the NSLS-II Storage Ring RF System

    Energy Technology Data Exchange (ETDEWEB)

    Gao, F.; Rose, J.; Cupolo, J.; Dilgen, T.; Rose, B.; Gash, W.; Ravindranath, V.; Yeddulla, M.; Papu, J.; Davila, P.; Holub, B.; Tagger, J.; Sikora, R.; Ramirez, G.; Kulpin, J.

    2015-05-03

    The National Synchrotron Light Source II (NSLS-II) is a 3 GeV electron X-ray user facility commissioned in 2014. The storage ring RF system, essential for replenishing energy loss per turn of the electrons, consists of digital low level RF controllers, 310 kW CW klystron transmitters, CESR-B type superconducting cavities, as well as a supporting cryogenic system. Here we will report on RF commissioning and early operation experience of the system for beam current up to 200mA.

  18. Magnet power supply system for the ALS storage ring and booster

    International Nuclear Information System (INIS)

    The Magnet Power Supply System is described by specification, design, hardware, and operating experience. A unique system for the one Hz, 1.5 GeV Booster, where the wideband QF and QD power supplies track the dipole current to within 0.1% at injection will be detailed. AC distribution system considerations related to inverting the stored energy of the booster magnet back into power grid will be discussed. The rational for linear correctors and individual quad supplies (225 total units) will be placed within the context of the storage-ring requirements

  19. Digital closed orbit feedback system for the Advanced Photon Source storage ring

    International Nuclear Information System (INIS)

    Closed orbit feedback for the Advanced Photon Source (APS) storage ring employs unified global an local feedback systems for stabilization of particle and photon beams based on digital signal processing (DSP). Hardware and software aspects of the system will be described. In particular, we will discuss global and local orbit feedback algorithms, PID (proportional, integral, and derivative) control algorithm. application of digital signal processing to compensate for vacuum chamber eddy current effects, resolution of the interaction between global and local systems through decoupling, self-correction of the local bump closure error, user interface through the APS control system, and system performance in the frequency and time domains. The system hardware, including the DSPS, is distributed in 20 VNE crates around the ring, and the entire feedback system runs synchronously at 4-kHz sampling frequency in order to achieve a correction bandwidth exceeding 100 Hz. The required data sharing between the global and local feedback systems is facilitated via the use of fiber-optically-networked reflective memories

  20. Digital closed orbit feedback system for the Advanced Photon Source storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Chung, Y.; Barr, D.; Decker, G.; Galayda, J.; Lenkszus, F.; Lumpkin, A.; Votaw, A.J. [Accelerator Systems Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439 (United States)

    1996-09-01

    Closed orbit feedback for the Advanced Photon Source (APS) storage ring employs unified global and local feedback systems for stabilization of particle and photon beams based on digital signal processing. Hardware and software aspects of the system will be described. In particular, we will discuss global and local orbit feedback algorithms, PID (proportional, integral, and derivative) control algorithm, application of digital signal processing to compensate for vacuum chamber eddy current effects, resolution of the interaction between global and local systems through decoupling, self-correction of the local bump closure error, user interface through the APS control system, and system performance in the frequency and time domains. The system hardware, including the digital signal processor (DSPs), is distributed in 20 VME crates around the ring, and the entire feedback system runs synchronously at 4-kHz sampling frequency in order to achieve a correction bandwidth exceeding 100 Hz. The required data sharing between the global and local feedback systems is facilitated via the use of fiber-optically networked reflective memories. {copyright} {ital 1996 American Institute of Physics.}

  1. Digital closed orbit feedback system for the Advanced Photon Source storage ring

    Science.gov (United States)

    Chung, Y.; Barr, D.; Decker, G.; Galayda, J.; Lenkszus, F.; Lumpkin, A.; Votaw, A. J.

    1996-09-01

    Closed orbit feedback for the Advanced Photon Source (APS) storage ring employs unified global and local feedback systems for stabilization of particle and photon beams based on digital signal processing. Hardware and software aspects of the system will be described. In particular, we will discuss global and local orbit feedback algorithms, PID (proportional, integral, and derivative) control algorithm, application of digital signal processing to compensate for vacuum chamber eddy current effects, resolution of the interaction between global and local systems through decoupling, self-correction of the local bump closure error, user interface through the APS control system, and system performance in the frequency and time domains. The system hardware, including the digital signal processor (DSPs), is distributed in 20 VME crates around the ring, and the entire feedback system runs synchronously at 4-kHz sampling frequency in order to achieve a correction bandwidth exceeding 100 Hz. The required data sharing between the global and local feedback systems is facilitated via the use of fiber-optically networked reflective memories.

  2. Towards the clinical use of concentric electrodes in ECG recordings: influence of ring dimensions and electrode position

    Science.gov (United States)

    Prats-Boluda, G.; Ye-Lin, Y.; Bueno-Barrachina, JM; Rodriguez de Sanabria, R.; Garcia-Casado, J.

    2016-02-01

    To overcome the limited spatial resolution of standard 12-lead ECG recordings, concentric ring electrodes (CRE) have been proposed to provide valuable data for the diagnosis of a wide range of cardiac abnormalities, including infarction and arrhythmia. Although theoretical studies indicate that the dimensions of the CRE regulate the depth of the electric dipoles sensed by these electrodes, this has not been experimentally confirmed. The aim of this work was to analyze the influence of CRE dimensions and position of a wireless multi-CRE sensor node on the cardiac signal recorded. For this, four wireless multichannel ECG recording nodes based on flexible multi-ring electrodes were placed at positions CMV1 (position comparable to V1), CMV2, CMV4R and CMV5; each node providing three bipolar concentric ECG signals (BC-ECG). Standard 12-lead ECG and 12 BC-ECG signals were recorded in 29 volunteers. The results revealed that a ring with an outer diameter of 33.5 mm achieves a balance between the ease-of-use and spatial resolution of smaller electrodes and improved detectability and higher amplitudes of signals from larger ring electrodes. Although a standard 12-lead ECG outperforms BC-ECC recordings in detectability of cardiac waves, if the relative amplitude of the wave is also considered, BC-ECG at CMV1 proved superior at picking up atrial activity. In fact, in most of the BC-ECG signals picked up at CMV1, P1 and P2 atrial activity waves were more clearly identified than in simultaneous 12-Lead ECG signals. Likewise, BC-ECG signals revealed higher spatial resolution in detecting anomalous electrical activity in local regions, such as impaired intraventricular driving, or atrioventricular blocks. Finally, the wireless multi-CRE sensor node provides enhanced comfort and handling to both patient and clinician over wired systems.

  3. JWST observations of stellar occultations by solar system bodies and rings

    CERN Document Server

    Santos-Sanz, P; Pinilla-Alonso, N; Stansberry, J; Lin, Z-Y; Zhang, Z-W; Vilenius, E; Müller, Th; Ortiz, J L; Braga-Ribas, F; Bosh, A; Duffard, R; Lellouch, E; Tancredi, G; Young, L

    2015-01-01

    In this paper we investigate the opportunities provided by the James Webb Space Telescope (JWST) for significant scientific advances in the study of solar system bodies and rings using stellar occultations. The strengths and weaknesses of the stellar occultation technique are evaluated in light of JWST's unique capabilities. We identify several possible JWST occultation events by minor bodies and rings, and evaluate their potential scientific value. These predictions depend critically on accurate a priori knowledge of the orbit of JWST near the Sun-Earth Lagrange-point 2 (L2). We also explore the possibility of serendipitous stellar occultations by very small minor bodies as a by-product of other JWST observing programs. Finally, to optimize the potential scientific return of stellar occultation observations, we identify several characteristics of JWST's orbit and instrumentation that should be taken into account during JWST's development.

  4. Alignment of Duke free electron laser storage ring and optical beam delivery system

    International Nuclear Information System (INIS)

    Duke Free Electron Laser Laboratory (DFELL) hosts a 1.1 GeV electron beam storage ring facility which is capable of generating beams in the range of nearly monochromatic gamma rays to high peak power infra red (IR) laser. In this report specifications and procedures for alignment of OK-4 /Duke storage ring FEL wiggler and optical cavity mirrors will be discussed. The OK-4 FEL lasing has demonstrated a series of world record in the last few years. In August of this year the OK-4 FEL successfully commissioned to laser at 193.7 nm. Also in this article, alignment of the γ-ray and UV optical beam delivery system that is currently in progress will be described. (authors)

  5. Simulation and Analysis of Multisoliton Generation Using a PANDA Ring Resonator System

    International Nuclear Information System (INIS)

    A novel system of multisoliton generation using nonlinear equations of the propagating signals is presented. This system uses a PANDA ring resonator incorporated with an add/drop filter system. Using resonant conditions, the intense optical fields known as multisolitons can be generated and propagated within a Kerr-type nonlinear medium. The present simulation results show that multisolitons can be controlled by using additional Gaussian pulses input into the add port of the PANDA system. For the soliton pulse in the microring device, a balance should be achieved between dispersion and nonlinear lengths. Chaotic output signals from the PANDA ring resonator are input into the add/drop filter system. Chaotic signals can be filtered by using the add/drop filter system, in which multi dark and bright solitons can be generated. In this work multi dark and bright solitons with an FWHM and an FSR of 425pm and 1.145 nm are generated, respectively, where the Gaussian pulse with a central wavelength of 1.55 μm and power of 600 mW is input into the system. (fundamental areas of phenomenology (including applications))

  6. Simulation and analysis of rf feedback systems on the SLC damping rings

    International Nuclear Information System (INIS)

    The rf system of the SLC Damping Rings has evolved since tighter tolerances on beam stability are encountered as beam intensities are increased. There are now many feedback systems controlling the phase and amplitude of the rf, the phase of the beam, and the tune of the cavity. The bandwidths of the feedback loops range from several MHz to compensate for beam loading to a few Hz for the cavity tuners. To improve our understanding of the interaction of these loops and verify the expected behavior, we have simulated their behavior using computer models. A description of the models and the first results are discussed

  7. Component and system tests of the SLD Cerenkov Ring Imaging Detector

    International Nuclear Information System (INIS)

    The components of the SLD barrel Cerenkov Ring Imaging Detector (CRID) are now built and are being installed. We report on tests of these, including tests of the fiber optic calibration system, detailed studies of electron drift paths on production drift boxes and detectors, tests of the dynamic gating system and its effect on drift path distortions due to space-charge, and a measurement of the electron lifetime in a production drift box. In addition, we report on the UV transmission of recirculated liquid C6F14 and on the effects of CRID construction materials on electron lifetime. 9 refs., 11 figs

  8. R and D status of the magnet system for ATF damping ring

    International Nuclear Information System (INIS)

    The ATF damping ring (DR) requires very strict conditions for the magnets system to realize a very low vertical normalized emittance less than 3x10-8 rm and a fast damping time. To obtain such a low emittance, the ATF-DR adopted a combined FOBO lattice and damping wigglers. Specifications of the magnet system have been almost fixed and some R and D magnets, which are a damping wiggler, a combined bending, quadrupoles and a sextupole magnet, have been manufactured and are waiting for precise field measurements. R and D status of these magnets are described. (author)

  9. Development of RF-linac and storage ring system for high-current experiments at GSI

    International Nuclear Information System (INIS)

    The heavy ion facility under construction at GSI is suitable for the generation of high-current beams. It consists of a new high-current injector into the Unilac and a synchrotron and storage ring. We discuss the capability of this system to produce short pulses of heavy ions with a specific energy of the order of 0.1 MJ/g. Under these conditions the system allows to perform a first generation of heavy ion driven target experiments and to test most of the critical issues of a large scale heavy ion fusion driver facility. (orig.)

  10. Ballistic transport in planetary ring systems due to particle erosion mechanisms. I - Theory, numerical methods, and illustrative examples

    Science.gov (United States)

    Durisen, Richard H.; Murphy, Brian W.; Cramer, Nichael Lynn; Cuzzi, Jeffrey N.; Mullikin, Thomas L.

    1989-01-01

    Ballistic transport, defined as the net radial transport of mass and angular momentum due to exchanges of meteoroid hypersonic-impact ejecta by neighboring planetary ring regions on time-scales orders-of-magnitude shorter than the age of the solar system, is presently considered as a problem in mathematical physics. The preliminary results of a numerical scheme for following the combined effects of ballistic transport and viscous diffusion demonstrate that ballistic transport generates structure near sharp edges already present in the ring-mass distribution; the entire ring system ultimately develops an undulatory structure whose length scale is typically of the order of the radial excursion of the impact ejecta.

  11. [Case of systemic myositis and subacute sensory neuropathy concomitant with signet-ring cell carcinoma].

    Science.gov (United States)

    Yasuda, Chiharu; Yakushiji, Yusuke; Tokunaga, Osamu; Hara, Hideo; Nishino, Ichizo

    2010-04-01

    A 72-year-old woman referred to our hospital because of slowly progressive (over 2 years) muscle weakness and paresthesias of the lower limbs. On neurological examination, weakness and muscle atrophies were noted in the distal upper limbs as well as the proximal lower limbs. She had also paresthesias of the legs. The level of creatinine phosphokinase (CK) was 126 IU/l. The magnetic resonance imaging demonstrated gadolinium enhancement of the nerve roots at the L4-S2 vertebrate levels. Nerve conduction study showed decreased compound muscle action potential and motor conduction velocity of tibial and peroneal nerves. Biopsy of the left biceps brachii muscle showed variations in fiber size, endomysial mononuclear cell infiltration and the findings like a rimmed vacuole. Although almost of her findings were in accord with clinical features of inclusion body myositis, strong inflammatory cellular influences allowed us to administer corticosteroid therapy. Because her weakness was well responded to steroid therapy, polymyositis was considered as differential diagnosis. Then, further examinations were investigated to search any occult neoplasm, and detected the early gastric cancer. Total gastrectomy was performed later, and the pathological diagnosis was made as a signet-ring cell carcinoma. To our knowledge, this is the first report of systemic myositis and subacute sensory neuropathy concomitant with signet-ring cell carcinoma. These symptoms might be occurred as a result of paraneoplastic syndrome associated with satellite effects of the signet-ring cell carcinoma. PMID:20411807

  12. Saturn's seasonal winds and temperature: The effect of the ring system on the troposphere and stratosphere

    International Nuclear Information System (INIS)

    The radiative properties of Saturn's rings (insolation shadowing, insolation scattering, and thermal emission) were incorporated into a seasonal, zonally-averaged, radiative-dynamical model to investigate the magnitude of small seasonal fluctuations in the troposphere and stratosphere of Saturn. Although the radiative time constant is large in Saturn's troposphere and stratosphere, the rings induce significant latitudinal insolation gradients resulting in potential disturbances in the upper stratosphere. The results of the model are compared to the Pioneer and Voyager Radio Sub-System (RSS) vertical temperature profile measurements and to the Voyager Infrared Interferometric Spectrometer (IRIS) latitudinal temperature profile measurements. In the upper stratosphere (1 to 30 mBar) the heating is dominated by methane and the model can be directly compared to the Voyager data. Below the temperature minimum the radiative time constant is sufficiently long to strongly dampen seasonal variations, however, the temperature excursions seen in the IRIS data are significantly larger than those predicted by the radiative model. The thermal effects of the strong Saturnian zonal winds are simulated with a first-order dynamical model to provide some insight into the lower boundary conditions. The remaining differences between the model and the Voyager IRIS data-sets are used to estimate the quantity of aerosol required near the tropopause region. The magnitudes of the wind and temperature perturbations, caused by the radiative effects of Saturn's rings, are discussed in the context of the future Hubble Space Telescope and the planned Cassini Saturnian Orbiter missions

  13. SPEED COMPLIANCE IN FREEWAY VARIABLE SPEED LIMIT SYSTEM – CASE STUDY OF THE PRAGUE CITY RING

    Directory of Open Access Journals (Sweden)

    Michał MATOWICKI

    2016-03-01

    Full Text Available Many previous studies have confirmed the strong relationship between speed compliance and the frequency and severity of traffic accidents. Variable speed limit (VSL system as a measure to improve traffic safety enables the freeway system to change its posted speed limit based on various traffic and environmental conditions. Such system helps drivers to recognize the upcoming events, to adjust their driving style and in such way to address speed variation of the traffic flow. This is called speed harmonization. Although many studies researching the effect of VSL system on the traffic stream can be found, there are only few addressing its influence on the drivers behavior, particularly focusing on their tolerance limit and compliance, which has crucial meaning for future design of controlling algorithms. This study was prepared to inspect this grey area by studying the data from the VSL system at Prague city ring, describing the influence of the highway management system and its influence on drivers.

  14. BC Hydro's transmission business : transition to a competitive marketplace

    International Nuclear Information System (INIS)

    Progress made by BC Hydro to facilitate the use of the transmission system for wholesale electricity transactions, including the separation of the system operation function from generation and merchant functions, was discussed. BC Hydro, Canada's third largest electric utility, was the first Canadian utility to offer open access to its transmission system for wholesale transactions. The utility has an installed generating capacity of about 10.8 gigawatts, 90 per cent of which is hydroelectric. The remainder is thermal, gas turbine and stationary and mobile diesel generation. The key element in establishing wholesale transmission transactions was the FERC-mandated open access same-time information system (OASIS) on which BC Hydro posts available transmission capacity, planned outages and pricing. The system operates on BC Hydro's internet node and interfaces to a Transmission Scheduling System (TSS). The TSS was developed in-house to handle the increased complexity of scheduling multiple energy and capacity transactions for users of the transmission system. Operation of the system and the challenge to constantly improve it were discussed

  15. A Performance Comparison of Tree and Ring Topologies in Distributed System

    Energy Technology Data Exchange (ETDEWEB)

    Min Huang

    2005-12-19

    A distributed system is a collection of computers that are connected via a communication network. Distributed systems have become commonplace due to the wide availability of low-cost, high performance computers and network devices. However, the management infrastructure often does not scale well when distributed systems get very large. Some of the considerations in building a distributed system are the choice of the network topology and the method used to construct the distributed system so as to optimize the scalability and reliability of the system, lower the cost of linking nodes together and minimize the message delay in transmission, and simplify system resource management. We have developed a new distributed management system that is able to handle the dynamic increase of system size, detect and recover the unexpected failure of system services, and manage system resources. The topologies used in the system are the tree-structured network and the ring-structured network. This thesis presents the research background, system components, design, implementation, experiment results and the conclusions of our work. The thesis is organized as follows: the research background is presented in chapter 1. Chapter 2 describes the system components, including the different node types and different connection types used in the system. In chapter 3, we describe the message types and message formats in the system. We discuss the system design and implementation in chapter 4. In chapter 5, we present the test environment and results, Finally, we conclude with a summary and describe our future work in chapter 6.

  16. Electronic structure of clusters (LiBC)n: n=1, 2 and 4

    International Nuclear Information System (INIS)

    A crystalline form of LiBC is known which has been predicted to be superconducting, with a Tc comparable to that of MgB2. In both compounds, superconductivity is enhanced by the presence of two electronic bands, one of which is close to a dimensional crossover. Here, we take a quantum chemical approach, and investigate the structural and electronic properties of small clusters (LiBC)n (n=1-4). With increasing cluster size, we find that several properties of crystalline LiBC evolve naturally from the corresponding properties of the clusters. In particular, one may recognize the origin of the solid bilayered structure, typical of magnesium diboride, and the character of the electronic σ-band, arising from the overlap of the atomic orbitals in the in-plane BC rings. Two aspects especially emphasized are (a) the HOMO-LUMO gap as function of n and (b) the role of different spin multiplicity

  17. Automatic local beam steering systems for NSLS X-Ray storage ring - Design and implementation

    International Nuclear Information System (INIS)

    Recently, two local automatic steering systems, controlled by microprocessors, have been installed and commissioned in the NSLS X-Ray storage ring. In each system, the position of the electron beam is stabilized at two locations by four independent servo systems. This paper describes three aspects of the local feedback program: (1) design, (2) commissioning and (3) limitation. The system design is explained by identifying major elements such as beam position detectors, signal processors, compensation amplifiers, ratio amplifiers, trim equalizers and microprocessor feedback controllers. System commissioning involves steps such as matching trim compensation, determination of local orbit bumps, measurement of open loop responses and design of servo circuits. Several limitations of performance are also discussed

  18. Vacuum system design for the PEP-II B Factory High-Energy Ring

    International Nuclear Information System (INIS)

    The design of the vacuum system for the PEP-II B Factory High-Energy Ring is reviewed. The thermal design and vacuum requirements are particularly challenging in PEP-II due to high stored beam currents up to 3.0 amps in 1658 bunches. The vacuum chambers for the HER arcs are fabricated by electron beam welding extruded copper sections up to 6 m long. Design of these chambers and the vacuum PumPing configuration is described with results from vacuum and thermal analyses

  19. Optical Properties of a Quantum Dot-Ring System Grown Using Droplet Epitaxy.

    Science.gov (United States)

    Linares-García, Gabriel; Meza-Montes, Lilia; Stinaff, Eric; Alsolamy, S M; Ware, M E; Mazur, Y I; Wang, Z M; Lee, Jihoon; Salamo, G J

    2016-12-01

    Electronic and optical properties of InAs/GaAs nanostructures grown by the droplet epitaxy method are studied. Carrier states were determined by k · p theory including effects of strain and In gradient concentration for a model geometry. Wavefunctions are highly localized in the dots. Coulomb and exchange interactions are studied and we found the system is in the strong confinement regime. Microphotoluminescence spectra and lifetimes were calculated and compared with measurements performed on a set of quantum rings in a single sample. Some features of spectra are in good agreement. PMID:27342603

  20. Experimental investigation of high voltage nanosecond generators of injection system for SIBERIA-2 storage ring

    International Nuclear Information System (INIS)

    The injection system for SIBERIA-2 storage ring (Kurchatov Institute, Moscow) has been put into commissioning. The high voltage impulse generators with double coaxial forming lines and three electrode nitrogen filled spark gaps are intended for linac electron gun and fast full-aperture kickers supply. The output impulses are up to 60 kV in amplitude, 15-20 ns in duration with front about 3 ns. A root-mean-square dispersion of time delays of gaps is 0.7-0.8 ns. The experimental results of operation of the generators are presented

  1. Transient analysis of the AGS-Booster ring dipole and quadrupole magnet system

    Energy Technology Data Exchange (ETDEWEB)

    Zhang, W.; Soukas, A.V.; Zhang, S.Y.

    1991-01-01

    A case study has been conducted for the quantitative analysis of the transmission line effects in the Brookhaven AGS Booster ring dipole and quadrupole magnet string. The Booster is a rapid cycling synchrotron (7.5 Hz) which is excited by multiphase rectifier power supplies. A computer model and a simulation program are developed to study the transient current response of the magnet string due to an applied step voltage. To damp out the staircase noise caused by wave reflection during the current ramp, external resistors will be added in parallel with each half dipole magnet and each quadrupole magnet. The system model simulation values are based on the actual magnet parameters, the magnet power supply bus system, and the proposed current ramping rate. The system simulation approach can be applied to a larger system as well, and will be briefly discussed. 5 refs., 7 figs.

  2. Transient analysis of the AGS-Booster ring dipole and quadrupole magnet system

    International Nuclear Information System (INIS)

    A case study has been conducted for the quantitative analysis of the transmission line effects in the Brookhaven AGS Booster ring dipole and quadrupole magnet string. The Booster is a rapid cycling synchrotron (7.5 Hz) which is excited by multiphase rectifier power supplies. A computer model and a simulation program are developed to study the transient current response of the magnet string due to an applied step voltage. To damp out the staircase noise caused by wave reflection during the current ramp, external resistors will be added in parallel with each half dipole magnet and each quadrupole magnet. The system model and simulation values are based on the actual magnet parameters, the magnet power supply bus system, and the proposed current ramping rate. The system simulation approach can be applied to a larger system as well, and is briefly discussed

  3. Introduction to the magnet and vacuum systems of an electron storage ring

    International Nuclear Information System (INIS)

    An accelerator or storage ring complex is a concerted interplay of various functional systems. For the convenience of discussion we can divide it into the following systems: injector, magnet, RF, vacuum, instrumentation and control. In addition, the conventional construction of the building and radiation safety consideration are also needed and finally the beam lines, detector, data acquisition and analysis set-ups for research programs. Dr. L. Teng has given a comprehensive review of the whole complex and the operation of such a facility. I concentrate on the description of magnet and vacuum systems. Only the general function of each system and the basic design concepts will be introduced, no detailed engineering practice will be given which will be best done after a machine design is produced. For further understanding and references a table of bibliography is provided at the end of the paper

  4. TechBC Memory Project: Chris Groeneboer

    OpenAIRE

    Hendrigan, Holly

    2015-01-01

    Chris Groeneboer is the subject of this interview. At TechBC, she was a manager in the Educational Technology and Learning group, building integrated curriculum across the three programs areas. She was retained by SFU when TechBC closed, managing the eLINC group at SFU Surrey. She is now Associate Director of SFU's Teaching and Learning Centre.

  5. The trigger system for the external target experiment in the HIRFL cooling storage ring

    Science.gov (United States)

    Li, Min; Zhao, Lei; Liu, Jin-Xin; Lu, Yi-Ming; Liu, Shu-Bin; An, Qi

    2016-08-01

    A trigger system was designed for the external target experiment in the Cooling Storage Ring (CSR) of the Heavy Ion Research Facility in Lanzhou (HIRFL). Considering that different detectors are scattered over a large area, the trigger system is designed based on a master-slave structure and fiber-based serial data transmission technique. The trigger logic is organized in hierarchies, and flexible reconfiguration of the trigger function is achieved based on command register access or overall field-programmable gate array (FPGA) logic on-line reconfiguration controlled by remote computers. We also conducted tests to confirm the function of the trigger electronics, and the results indicate that this trigger system works well. Supported by the National Natural Science Foundation of China (11079003), the Knowledge Innovation Program of the Chinese Academy of Sciences (KJCX2-YW-N27), and the CAS Center for Excellence in Particle Physics (CCEPP).

  6. Upgrade of beam steering system components and controls for the NSLS storage rings

    International Nuclear Information System (INIS)

    The installation of the new insertion devices and new experiments on the NSLS storage rings has increased the demand for better stability of the electron orbit. This, in turn, increased the demand for better stability and resolution as well as larger bandwidth of the orbit correction system. All of the orbit correcting dipoles now have new low-hysteresis laminated steel cores. The magnets are excited by commercial wide-band (1 kHz) current regulated power supplies. The input circuits of the new power supplies permit a summation of analog inputs from orbit stabilization systems with set-point inputs digitally controlled by the operator. This paper describes the design of the new system and summarizes its present performance. 2 refs., 8 figs., 1 tab

  7. Fermilab Main Ring low level RF system modifications for focus free transition beam tests

    International Nuclear Information System (INIS)

    A novel idea for crossing transition energy has been proposed for study in the Fermilab Main Ring accelerator. The idea has been named focus free transition crossing and involves reducing the RF focusing force nearly to zero when the beam energy is near the transition energy by adding a third harmonic to the RF accelerating voltage, and then adjusting the accelerating phase angle to 90 degrees. The modification of the accelerating voltage wave form shape and phase are accomplished by accurate program control of the amplitude and phase of the 53 Mhz RF cavities and a recently installed 159 Mhz cavity. The studies also require interrupting the normal LLRF system beam energy feedback loops in favor of a new energy control loop near the transition energy. This paper describes the functions of the LLRF system electronics recently installed to facilitate this control, and initial operational experience with the system

  8. Formation of Regular Satellites from Ancient Massive Rings in the Solar System

    Science.gov (United States)

    Crida, A.; Charnoz, S.

    2012-11-01

    When a planetary tidal disk—like Saturn’s rings—spreads beyond the Roche radius (inside which planetary tides prevent aggregation), satellites form and migrate away. Here, we show that most regular satellites in the solar system probably formed in this way. According to our analytical model, when the spreading is slow, a retinue of satellites appear with masses increasing with distance to the Roche radius, in excellent agreement with Saturn’s, Uranus’, and Neptune’s satellite systems. This suggests that Uranus and Neptune used to have massive rings that disappeared to give birth to most of their regular satellites. When the spreading is fast, only one large satellite forms, as was the case for Pluto and Earth. This conceptually bridges the gap between terrestrial and giant planet systems.

  9. The Ring of Fire - an internal illimination system for detector sensitivity and filter bandpass characterization

    Energy Technology Data Exchange (ETDEWEB)

    Scarpine, Victor E.; Kent, Stephen M.; /Fermilab; Deustua, Susana E.; /Baltimore, Space Telescope Sci.; Sholl, Michael J.; /LBL, Berkeley; Mufson, Stuart L.; /Indiana U.; Ott, Melanie N.; /NASA, Goddard; Wiesner, Matthew P.; /Northern Illinois U.; Baptitst, Brian J.; /Indiana U.

    2010-07-01

    We describe a prototype of an illumination system, the Ring of Fire (ROF), which is used as part of an internal calibration system for large focal plane detector arrays in TMA (Three Mirror Anastigmat) telescope designs. Such designs have been proposed for the SNAP (SuperNova Acceleration Probe) version of a Joint Dark Energy Mission (JDEM). The ROF system illuminates the focal plane with a light beam the closely matches that of the telescope and is used for creating high spatial frequency flat fields and monitoring filter bandpasses for experiments that demand a highly accurate characterization of the detectors. We present measurements of a mockup of this prototype ROF design including studies in variations in illumination across a large focal plane.

  10. Locating the Trailing Edge of the Circumbinary Ring in the KH 15D System

    CERN Document Server

    Capelo, Holly L; Leggett, S K; Hamilton, Catrina M; Johnson, John A

    2012-01-01

    Following two years of complete occultation of both stars by its opaque circumbinary ring, the binary T Tauri star KH 15D has abruptly brightened again during apastron phases, reaching I = 15 mag. Here, we show that the brightening is accompanied by a change in spectral class from K6/K7 (the spectral class of star A) to ~K1, and a bluing of the system in V-I by about 0.3 mag. A radial velocity measurement confirms that, at apastron, we are now seeing direct light from star B, which is more luminous and of earlier spectral class than star A. Evidently, the trailing edge of the occulting screen has just become tangent to one anse of star B's projected orbit. This confirms a prediction of the precession models, supports the view that the tilted ring is self-gravitating, and ushers in a new era of the system's evolution that should be accompanied by the same kind of dramatic phenomena observed from 1995-2009. It also promotes KH 15D from a single-lined to a double-lined eclipsing binary, greatly enhancing its val...

  11. Deconstructing hydro: the BC electricity sector in this decade

    International Nuclear Information System (INIS)

    This paper provided speculation regarding the world-wide trend to deregulate electric utilities with particular focus on power deregulation in British Columbia. The four main issues facing electricity reform in British Columbia are to determine if publicly-owned assets should be privatised, how to achieve competitive electricity commodity prices in a de-regulated generation market, to determine the extent to which customers will be allowed direct access to sellers of electricity, and to determine which changes in industry structure are needed to ensure that control over the common carrier does not hinder fair competition. BC Hydro recently issued a plan for the next decade entitled the Integrated Electricity Plan which suggests that almost all growth in supply on the Hydro system will be limited to a few large projects totalling 900 megawatts, to be owned and operated by either BC Hydro or by the Columbia Power Corporation, another Crown entity. This plan is in complete contrast to the evolution of the electricity industry nearly everywhere else in the world where demand growth is being met almost entirely by small- and medium-scale non-utility resources issuing from competitive markets with minimal public funding. This article looks at why BC Hydro will probably be transformed significantly, even dismantled, in the coming decade. The article begins with a section explaining the cause and effects of major changes in the world-wide electricity industry. This is followed by a section reviewing what BC Hydro did in the 1990s while reform was taking place. The article also describes what BC Hydro intends to do in the next decade and explores reasons why this outcome is unlikely. The final section of the article provides an alternative vision of BC Hydro's future over the next decade. 1 tab., 3 figs

  12. A new data acquisition system for Schottky signals in atomic physics experiments at GSI's and FAIR's storage rings

    Science.gov (United States)

    Trageser, C.; Brandau, C.; Kozhuharov, C.; Litvinov, Yu A.; Müller, A.; Nolden, F.; Sanjari, S.; Stöhlker, T.

    2015-11-01

    A new continuous and broadband data acquisition system for measurements of Schottky-signals of ions revolving in a storage ring has been implemented. This set-up is capable of recording the radio frequency (RF) signal of the ions that circulate in the storage ring with a sustained acquisition rate of more than 3.5× {10}7 IQ-samples per second. This allows several harmonics of the full momentum acceptance of a storage ring to be measured at the same time. The RF signal analyzer modules are complemented by further electronic modules such as counters, precision clocks and synchronization modules that facilitate a seamless integration with main experimental data acquisitions for atomic and nuclear physics. In this contribution, the setup and first results from a test run at the experimental storage ring at GSI, Darmstadt, Germany, are presented.

  13. Vacuum system development status for the APS [Advanced Photon Source] storage ring

    International Nuclear Information System (INIS)

    The status of the design and fabrication of a prototype sector of the storage ring vacuum system for the Advanced Photon Source is described. The 26.5-m-long prototype sector will be assembled within a full-scale magnet and tunnel mockup to study interspacial component relationships for maintenance, as well as the vacuum system operational performance. Each completed vacuum section is mounted as an integral part of the modular structure that contains the magnets and magnet power supplies on a common base. Unique automatic machine welding designs and techniques are employed in the fabrication of the aluminium vacuum chambers from extrusions. Special chamber bending procedures and measurements checks are used to maintain the required flatness of the insider chamber light gap surfaces. Photo-electron yields due to low-energy photons in the narrow channel gap of the vacuum chamber and their potential effects on the overall outgassing rate are found to be negligible. 9 refs., 5 figs

  14. Vacuum system of the high energy ring of an asymmetric B-factory based on PEP

    International Nuclear Information System (INIS)

    The multi-ampere currents required for high luminosity operation of an asymmetric B factory leads to extremely stressing requirements on a vacuum system suitable for maintaining long beam-gas lifetimes and acceptable background levels in the detector. We present the design for a Cu alloy vacuum chamber and its associated pumping system for the 9 GeV electron storage ring of the proposed B factory based on PEP. The excellent thermal and photo-desorption properties of Cu allows handling the high proton flux in a conventional, single chamber design with distributed ion pumps. The x-ray opacity of the Cu is sufficiently high that no additional lead shielding is necessary to protect the dipoles from the intense synchrotron radiation generated by the beam. The design allows chamber commissioning in <500 hr of operation. 5 refs., 3 figs., 2 tabs

  15. Reflective variable optical attenuators and fibre ring lasers for wavelength-division multiplexing systems

    Science.gov (United States)

    Liu, He Liang

    Wavelength division multiplexing (WDM) optical fibre system is an important enabling technology to fulfill the demands for bandwidth in the modern information age. The main objective of this project is to study novel devices with the potential to enhance the performance of WDM systems. In particular, a novel reflective variable optical attenuator (RVOA) used for dynamic gain equalization (DGE) and fibre lasers based on an entirely new type of erbium-doped fibres with ultrawide tuning range were investigated theoretically and experimentally. We proposed a new type of RVOA device which could be potentially integrated with arrayed waveguide grating (AWG) to reduce the cost of DGE substantially. Initially, fibre-based RVOAs, fabricated with optical fibre components such as fibre coupler and Faraday rotator mirror, were investigated theoretically and experimentally. Larger attenuation range up to 22 dB was realized for fibre coupler-based ROVA with a Faraday rotator mirror and its polarization-dependent loss is about 0.5 dB. Then polymeric waveguide-based RVOAs were investigated theoretically and experimentally. Using an epoxy Novolak resin as core material and an UV-cured resin (Norland's NOA61) as cladding material, a polymeric waveguide RVOA was successfully fabricated. The dynamic 15 dB attenuation range was achieved and the PDL was less than 0.2 dB. The measured insertion loss of the polymeric waveguide RVOA was too large (about 18 dB) and was mainly induced by coupling loss, material loss and poor alignment. In the second part of the study, fibre ring lasers with continuous wavelength tuning over wide wavelength range and fibre ring lasers with discrete wavelength tuning were investigated. Tunable lasers are important devices in WDM systems because they could be employed as reserved sources and therefore avoiding the need to stock large inventory of lasers to cover the ITU-wavelength grid. In this project, erbium ions doped bismuth oxide glass fibres instead of

  16. AP calculus AB & BC crash course

    CERN Document Server

    Rosebush, J

    2012-01-01

    AP Calculus AB & BC Crash Course - Gets You a Higher Advanced Placement Score in Less Time Crash Course is perfect for the time-crunched student, the last-minute studier, or anyone who wants a refresher on the subject. AP Calculus AB & BC Crash Course gives you: Targeted, Focused Review - Study Only What You Need to Know Crash Course is based on an in-depth analysis of the AP Calculus AB & BC course description outline and actual AP test questions. It covers only the information tested on the exams, so you can make the most of your valuable study time. Written by experienced math teachers, our

  17. The Hellenistic Age – (323 - 30 BC)

    OpenAIRE

    Salles, Jean-François

    2014-01-01

    The period that historians call Hellenistic broadly extends from the death of Alexander the Great in 323 BC until the first century BC - approximately 66 to 30 BC - when the Romans gradually took control of the Near East. The term Hellenistic refers to a cultural phenomenon known as “Hellenization” i.e. the extensive dissemination (begun at least two centuries before Alexander) of the Greek language in the Near East, as well as a series of new customs and philosophical, political or religious...

  18. A System of Four Matrix Equations over von Neumann Regular Rings and Its Applications

    Institute of Scientific and Technical Information of China (English)

    Qing Wen WANG

    2005-01-01

    We consider the system of four linear matrix equations A1X = C1, XB2 = C2, A3XB3 = C3 and A4XB4 = C4 over(R) , an arbitrary yon Neumann regular ring with identity. A necessary and sufficient condition for the existence and the expression of the general solution to the system are derived. As applications, necessary and sufficient conditions are given for the system of matrix equations A1X = C1 and A3X = C3 to have a bisymmetric solution, the system of matrix equations A1X = C1and A3XB3 = C3 to have a perselfconjugate solution over(R) with an involution and char ≠(R)2,respectively. The representations of such solutions are also presented. Moreover, some auxiliary results on other systems over(R)are obtained. The previous known results on some systems of matrix equations are special cases of the new results.

  19. A wireless fatigue monitoring system utilizing a bio-inspired tree ring data tracking technique.

    Science.gov (United States)

    Bai, Shi; Li, Xuan; Xie, Zhaohui; Zhou, Zhi; Ou, Jinping

    2014-01-01

    Fatigue, a hot scientific research topic for centuries, can trigger sudden failure of critical structures such as aircraft and railway systems, resulting in enormous casualties as well as economic losses. The fatigue life of certain structures is intrinsically random and few monitoring techniques are capable of tracking the full life-cycle fatigue damage. In this paper, a novel in-situ wireless real-time fatigue monitoring system using a bio-inspired tree ring data tracking technique is proposed. The general framework, methodology, and verification of this intelligent system are discussed in details. The rain-flow counting (RFC) method is adopted as the core algorithm which quantifies fatigue damages, and Digital Signal Processing (DSP) is introduced as the core module for data collection and analysis. Laboratory test results based on strain gauges and polyvinylidene fluoride (PVDF) sensors have shown that the developed intelligent system can provide a reliable quick feedback and early warning of fatigue failure. With the merits of low cost, high accuracy and great reliability, the developed wireless fatigue sensing system can be further applied to mechanical engineering, civil infrastructures, transportation systems, aerospace engineering, etc. PMID:24603635

  20. A Wireless Fatigue Monitoring System Utilizing a Bio-Inspired Tree Ring Data Tracking Technique

    Directory of Open Access Journals (Sweden)

    Shi Bai

    2014-03-01

    Full Text Available Fatigue, a hot scientific research topic for centuries, can trigger sudden failure of critical structures such as aircraft and railway systems, resulting in enormous casualties as well as economic losses. The fatigue life of certain structures is intrinsically random and few monitoring techniques are capable of tracking the full life-cycle fatigue damage. In this paper, a novel in-situ wireless real-time fatigue monitoring system using a bio-inspired tree ring data tracking technique is proposed. The general framework, methodology, and verification of this intelligent system are discussed in details. The rain-flow counting (RFC method is adopted as the core algorithm which quantifies fatigue damages, and Digital Signal Processing (DSP is introduced as the core module for data collection and analysis. Laboratory test results based on strain gauges and polyvinylidene fluoride (PVDF sensors have shown that the developed intelligent system can provide a reliable quick feedback and early warning of fatigue failure. With the merits of low cost, high accuracy and great reliability, the developed wireless fatigue sensing system can be further applied to mechanical engineering, civil infrastructures, transportation systems, aerospace engineering, etc.

  1. Small-animal whole-body imaging using a photoacoustic full ring array system

    Science.gov (United States)

    Xia, Jun; Guo, Zijian; Aguirre, Andres; Zhu, Quing; Wang, Lihong V.

    2011-03-01

    In this report, we present a novel 3D photoacoustic computed tomography (PACT) system for small-animal whole-body imaging. The PACT system, based on a 512-element full-ring transducer array, received photoacoustic signals primarily from a 2-mm-thick slice. The light was generated by a pulse laser, and can either illuminate from the top or be reshaped to illuminate the sample from the side, using a conical lens and an optical condenser. The PACT system was capable of acquiring an in-plane image in 1.6 s; by scanning the sample in the elevational direction, a 3D tomographic image could be constructed. We tested the system by imaging a cylindrical phantom made of human hairs immersed in a scattering medium. The reconstructed image achieved an in-plane resolution of 0.1 mm and an elevational resolution of 1 mm. After deconvolution in the elevational direction, the 3D image was found to match well with the phantom. The system was also used to image a baby mouse in situ; the spinal cord and ribs can be seen easily in the reconstructed image. Our results demonstrate that the PACT system has the potential to be used for fast small-animal whole-body tomographic imaging.

  2. Black rings

    International Nuclear Information System (INIS)

    A black ring is a five-dimensional black hole with an event horizon of topology S1 x S2. We provide an introduction to the description of black rings in general relativity and string theory. Novel aspects of the presentation include a new approach to constructing black ring coordinates and a critical review of black ring microscopics. (topical review)

  3. Novel DC ring topology and protection system - a comprehensive solution for mega city power grids

    Science.gov (United States)

    Haj-Maharsi, Mohamed Yassine

    2009-07-01

    The development of mega cities leads to increased load concentration and brings additional challenges to managing the electrical grid while keeping power available for critical loads. Techniques using FACTS devices are being applied to alleviate power management difficulties and to confine faults in their originating areas in order to limit the risk of cascading failures in the grid. The addition of many FACTS devices often results in control and protection coordination difficulties, power oscillations between connected networks, subsynchronous resonance problems, and torsional interactions with nearby generator units. The most effective solution is obtained when the individual AC subsystems representing sources and loads are decoupled so a fault in a given subsystem is not propagated to another subsystem. This solution can be achieved by the deployment of a DC system where power sources and loads are connected to the DC bus through voltage source converters. For a mega city, this would be conceived as a DC ring feeding multiple loads and connected to remote and local power sources. Unfortunately, the lack of fast DC circuit breakers has been one of the key issues affecting extensive applications of DC systems with common DC buses; a DC fault would discharge all the capacitors of the DC bus and cause delays in system recovery and possibly a wide system collapse. In this research, I provide a comprehensive solution to mega city power grid problems by proposing a DC system topology that enables grid expansions without affecting existing protection settings or changing existing AC breaker ratings. I also propose the means for protecting the DC system by designing a fast DC breaker and developing a control algorithm capable of isolating DC faults without blocking converter stations or depleting DC bus capacitors. My contribution is three folds: (1) I modeled and simulated Shanghai power grid and performed a study to identify short circuit and voltage stability problems

  4. BC Hydro experiences the power of engineering document management software

    International Nuclear Information System (INIS)

    The recent popularity of electronic document management software (EDMS), specifically designed for engineering CAD/CAM drawings that holds the promise of reducing paper-pushing and freeing up organizational resources for more productive purposes, is discussed. To illustrate how such systems function, a document management system installed at BC Hydro, with over 2,500 users in two main engineering groups is described. The new system - FileNET - replaces several older systems that have been used as stand-alone systems in various divisions of BC Hydro for some time. Instead of integrating the entire file of some 750,000 documents, the new system has complete records of some 70,000 of the most recent CAD drawings and an on-line index to the older file that is used less frequently. Access to the entire storehouse of drawings is said to be fast, efficient and secure. Automated document control procedures during work-in-progress, viewing, redlining capabilities, seamless integration with CAD tools and Web access to drawings from anywhere within the two engineering divisions, are some of the most noteworthy characteristics of the new system. It does not completely replace paper, but it does promise significant streamlining of the paper handling function. It also ensures that BC Hydro's central computer is the prime repository of all documents and drawings, and that this valuable record of environmental. legal, regulatory and other public policy importance is instantly available, without the need to handle paper

  5. BC Hydro experiences the power of engineering document management software

    Energy Technology Data Exchange (ETDEWEB)

    Wilkins, A.

    2000-04-01

    The recent popularity of electronic document management software (EDMS), specifically designed for engineering CAD/CAM drawings that holds the promise of reducing paper-pushing and freeing up organizational resources for more productive purposes, is discussed. To illustrate how such systems function, a document management system installed at BC Hydro, with over 2,500 users in two main engineering groups is described. The new system - FileNET - replaces several older systems that have been used as stand-alone systems in various divisions of BC Hydro for some time. Instead of integrating the entire file of some 750,000 documents, the new system has complete records of some 70,000 of the most recent CAD drawings and an on-line index to the older file that is used less frequently. Access to the entire storehouse of drawings is said to be fast, efficient and secure. Automated document control procedures during work-in-progress, viewing, redlining capabilities, seamless integration with CAD tools and Web access to drawings from anywhere within the two engineering divisions, are some of the most noteworthy characteristics of the new system. It does not completely replace paper, but it does promise significant streamlining of the paper handling function. It also ensures that BC Hydro's central computer is the prime repository of all documents and drawings, and that this valuable record of environmental. legal, regulatory and other public policy importance is instantly available, without the need to handle paper.

  6. Bacterial Cellulose (BC) as a Functional Nanocomposite Biomaterial

    Science.gov (United States)

    Nandgaonkar, Avinav Ghanashyam

    compressive tests. In our second study, we developed a one-pot in-situ biosynthetic method to fabricate structurally controllable bacterial cellulose (BC)/reduced graphene oxide (RGO) composites. The graphene oxide (GO) was highly reduced during a standard autoclave process using a traditional mannitol culture medium as the reducing agent. The electrical conductivity of the RGO was found to be 23.75 S m-1. The final BC/RGO composites were developed in three distinct forms: 1) sealed structures in the water, 2) aerogels characterized by a porous cross section and aligned longitudinal structure, and 3) films embedded within the RGO sheets. Because of the simplicity and non-toxic nature of this work, it can be used in biomedical and bioelectronics applications. The last study was on dye degradation using BC as the substrate. The surface of the BC was chemically oxidized to produce aldehyde groups to successfully covalently crosslink laccase. TiO2 and laccase (Lac) were co-immobilized on the surface of OBC and the dye degradation process was carried out under specific conditions. Compared with free laccase, the optimum pH of the immobilized laccase system shifted to lower pH, while the optimum temperature decreased from 55 °C to 50 °C. The dye degradation experiments showed that the optimum pH for dye degradation was pH 5.0-6.0, while the optimum temperature was ca. 40 ºC. Under UV illumination, the dye degradation efficiency significantly improved characteristic of a synergy in the system. This dissertation contributes to the basic research of bacterial cellulose which will result in novel ideas that can possibly result in future industrial applications. The research provides a fundamental underpinning of specialized structure-property relationships between BC and the materials used to fabricate the BC nanocomposites that have value-added applications that are environmentally safe and eco-friendly.

  7. Power supply system of J-PARC main ring main magnets for high repetition rate operation

    International Nuclear Information System (INIS)

    Japan Proton Accelerator Research Complex (J-PARC) aims at achieving a MW-class proton accelerator facility. One of the promising solutions for increasing the beam power is to fasten the repetition rate of Main Ring (MR) from current rating of 2.5 sec to 1 sec in the future. However, in this scheme, the increase of output voltage and the power variation on the electric system are serious concerns for main magnets. At the same time, current ripple reduction is required in order to increase the beam quality for the hadron experiments. We have been developing power supplies which have potentials to solve these problems and plan to replace the current power supplies with them. The new power supply system has following features. The number of power supply is twice so that one power supply drives half number of loads compared with the current system. The power supply is consists of some choppers which are wired in series. The energy recovery scheme based on the capacitive energy storage is introduced. Parallel connected choppers increase the equivalent switching frequency so that the switching ripple is possible to be reduced by the filter. This paper introduces the power supply system of J-PARC MR main magnets for high repetition rate operation. (author)

  8. Nonlinear effects of unbalance in the rotor-floating ring bearing system of turbochargers

    Science.gov (United States)

    Tian, L.; Wang, W. J.; Peng, Z. J.

    2013-01-01

    Turbocharger (TC) rotor-floating ring bearing (FRB) system is characterised by high speed as well as high non-linearity. Using the run-up and run-down simulation method, this paper systematically investigates the influence of unbalance on the rotordynamic characteristics of a real TC-FRB system over the speed range from 0 Hz to 3500 Hz. The rotor is discretized by the finite element method, and the desired oil film forces at each simulation step are calculated by an efficient analytical method. The imposed unbalance amount and distribution are the variables considered in the performed non-stationary simulations. The newly obtained results evidently show the distinct phenomena brought about by the variations of the unbalance offset, which confirms that the unbalance level is a critical parameter for the system response. In the meantime, the variations of unbalance distribution, i.e. out-of-phase and in-phase unbalance, can lead to entirely different simulation results as well, which proves the distribution of unbalance is not negligible during the dynamic analysis of the rotor-FRB system. Additionally, considerable effort has been placed on the description as well as discussion of a unique phenomenon termed Critical Limit Cycle Oscillation (CLC Oscillation), which is of great importance and interest to the TC research and development.

  9. Initial test results of the Los Alamos proton-storage-ring bump-magnet system

    Energy Technology Data Exchange (ETDEWEB)

    Rose, C.R.; Barlow, D.B.; Redd, D.B.

    1997-09-01

    An upgrade program for increasing the stored beam current in the LANSCE Proton Storage is presently under way. Part of the upgrade effort has been to design, specify, and add four bump-magnet/modulator systems to the ring. This paper describes the initial test results of the first bump-magnet/modulator system. The paper begins with an overview of the pulsed-power system including important specifications of the modulator, magnet, cabling, and control system. In the main portion of the paper, waveforms and test data are included showing the accuracy, repeatability, and stability of the magnet-current pulses. These magnet pulses are programmable both in rise and fall time as well as in amplitude. The amplitude can be set between 50 and 300 A, the rise-time is fixed at 1 ms, and the linear fall-time can be varied between 500 {mu}s and 1500 {mu}s. Other issues such as loading effects and power dissipation in the magnet-bore beamtube are examined and reported.

  10. Asymmetric Total Synthesis of Propindilactone G, Part 2: Enantioselective Construction of the Fully Functionalized BCDE Ring System.

    Science.gov (United States)

    Zhang, Jia-Jun; You, Lin; Wang, Yue-Fan; Li, Yuan-He; Liang, Xin-Ting; Zhang, Bo; Yang, Shou-Liang; Su, Qi; Chen, Jia-Hua; Yang, Zhen

    2016-05-01

    The enantioselective synthesis of the fully functionalized BCDE tetracyclic ring system of propindilactone G (A) is reported. Several synthetic methods were developed and applied to achieve this goal, including: 1) an asymmetric Diels-Alder reaction in the presence of Hayashi's catalyst for the synthesis of optically pure key intermediate 3; 2) an intramolecular Pauson-Khand reaction (PKR) for the stereoselective synthesis of the BCDE ring with an all-carbon chiral quaternary center at the C13 position by using the TMS-substituted acetylene as the substrate; and 3) Pd-catalyzed reductive hydrogenolysis for the stereoselective synthesis of the fully functionalized BCDE tetracyclic ring system. The chemistry developed herein provided a greater understanding of the total synthesis propindilactone G (A) and its analogues. PMID:26991420

  11. Observation of the decay Bc+/--->J/psipi+/- and measurement of the Bc+/- mass.

    Science.gov (United States)

    Aaltonen, T; Adelman, J; Akimoto, T; Albrow, M G; Alvarez González, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Aoki, M; Apollinari, G; Apresyan, A; Arisawa, T; Artikov, A; Ashmanskas, W; Attal, A; Aurisano, A; Azfar, F; Azzi-Bacchetta, P; Azzurri, P; Bacchetta, N; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Baroiant, S; Bartsch, V; Bauer, G; Beauchemin, P-H; Bedeschi, F; Bednar, P; Behari, S; Bellettini, G; Bellinger, J; Belloni, A; Benjamin, D; Beretvas, A; Beringer, J; Berry, T; Bhatti, A; Binkley, M; Bisello, D; Bizjak, I; Blair, R E; Blocker, C; Blumenfeld, B; Bocci, A; Bodek, A; Boisvert, V; Bolla, G; Bolshov, A; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Bridgeman, A; Brigliadori, L; Bromberg, C; Brubaker, E; Budagov, J; Budd, H S; Budd, S; Burkett, K; Busetto, G; Bussey, P; Buzatu, A; Byrum, K L; Cabrera, S; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carlsmith, D; Carosi, R; Carrillo, S; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chang, S H; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, K; Chokheli, D; Chou, J P; Choudalakis, G; Chuang, S H; Chung, K; Chung, W H; Chung, Y S; Ciobanu, C I; Ciocci, M A; Clark, A; Clark, D; Compostella, G; Convery, M E; Conway, J; Cooper, B; Copic, K; Cordelli, M; Cortiana, G; Crescioli, F; Cuenca Almenar, C; Cuevas, J; Culbertson, R; Cully, J C; Dagenhart, D; Datta, M; Davies, T; de Barbaro, P; De Cecco, S; Deisher, A; De Lentdecker, G; De Lorenzo, G; Dell'Orso, M; Demortier, L; Deng, J; Deninno, M; De Pedis, D; Derwent, P F; Di Giovanni, G P; Dionisi, C; Di Ruzza, B; Dittmann, J R; D'Onofrio, M; Donati, S; Dong, P; Donini, J; Dorigo, T; Dube, S; Efron, J; Erbacher, R; Errede, D; Errede, S; Eusebi, R; Fang, H C; Farrington, S; Fedorko, W T; Feild, R G; Feindt, M; Fernandez, J P; Ferrazza, C; Field, R; Flanagan, G; Forrest, R; Forrester, S; Franklin, M; Freeman, J C; Furic, I; Gallinaro, M; Galyardt, J; Garberson, F; Garcia, J E; Garfinkel, A F; Genser, K; Gerberich, H; Gerdes, D; Giagu, S; Giakoumopolou, V; Giannetti, P; Gibson, K; Gimmell, J L; Ginsburg, C M; Giokaris, N; Giordani, M; Giromini, P; Giunta, M; Glagolev, V; Glenzinski, D; Gold, M; Goldschmidt, N; Golossanov, A; Gomez, G; Gomez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Goulianos, K; Gresele, A; Grinstein, S; Grosso-Pilcher, C; Grundler, U; Guimaraes da Costa, J; Gunay-Unalan, Z; Haber, C; Hahn, K; Hahn, S R; Halkiadakis, E; Hamilton, A; Han, B-Y; Han, J Y; Handler, R; Happacher, F; Hara, K; Hare, D; Hare, M; Harper, S; Harr, R F; Harris, R M; Hartz, M; Hatakeyama, K; Hauser, J; Hays, C; Heck, M; Heijboer, A; Heinemann, B; Heinrich, J; Henderson, C; Herndon, M; Heuser, J; Hewamanage, S; Hidas, D; Hill, C S; Hirschbuehl, D; Hocker, A; Hou, S; Houlden, M; Hsu, S-C; Huffman, B T; Hughes, R E; Husemann, U; Huston, J; Incandela, J; Introzzi, G; Iori, M; Ivanov, A; Iyutin, B; James, E; Jayatilaka, B; Jeans, D; Jeon, E J; Jindariani, S; Johnson, W; Jones, M; Joo, K K; Jun, S Y; Jung, J E; Junk, T R; Kamon, T; Kar, D; Karchin, P E; Kato, Y; Kephart, R; Kerzel, U; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kimura, N; Kirsch, L; Klimenko, S; Klute, M; Knuteson, B; Ko, B R; Koay, S A; Kondo, K; Kong, D J; Konigsberg, J; Korytov, A; Kotwal, A V; Kraus, J; Kreps, M; Kroll, J; Krumnack, N; Kruse, M; Krutelyov, V; Kubo, T; Kuhlmann, S E; Kuhr, T; Kulkarni, N P; Kusakabe, Y; Kwang, S; Laasanen, A T; Lai, S; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; Lecompte, T; Lee, J; Lee, J; Lee, Y J; Lee, S W; Lefèvre, R; Leonardo, N; Leone, S; Levy, S; Lewis, J D; Lin, C; Lin, C S; Linacre, J; Lindgren, M; Lipeles, E; Lister, A; Litvintsev, D O; Liu, T; Lockyer, N S; Loginov, A; Loreti, M; Lovas, L; Lu, R-S; Lucchesi, D; Lueck, J; Luci, C; Lujan, P; Lukens, P; Lungu, G; Lyons, L; Lys, J; Lysak, R; Lytken, E; Mack, P; Macqueen, D; Madrak, R; Maeshima, K; Makhoul, K; Maki, T; Maksimovic, P; Malde, S; Malik, S; Manca, G; Manousakis, A; Margaroli, F; Marino, C; Marino, C P; Martin, A; Martin, M; Martin, V; Martínez, M; Martínez-Ballarín, R; Maruyama, T; Mastrandrea, P; Masubuchi, T; Mattson, M E; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtala, P; Menzemer, S; Menzione, A; Merkel, P; Mesropian, C; Messina, A; Miao, T; Miladinovic, N; Miles, J; Miller, R; Mills, C; Milnik, M; Mitra, A; Mitselmakher, G; Miyake, H; Moed, S; Moggi, N; Moon, C S; Moore, R; Morello, M; Movilla Fernandez, P; Mülmenstädt, J; Mukherjee, A; Muller, Th; Mumford, R; Murat, P; Mussini, M; Nachtman, J; Nagai, Y; Nagano, A; Naganoma, J; Nakamura, K; Nakano, I; Napier, A; Necula, V; Neu, C; Neubauer, M S; Nielsen, J; Nodulman, L; Norman, M; Norniella, O; Nurse, E; Oh, S H

    2008-05-01

    The Bc+/- meson is observed through the decay Bc+/--->J/psipi+/-, in data corresponding to an integrated luminosity of 2.4 fb(-1) recorded by the Collider Detector at Fermilab II detector at the Fermilab Tevatron. A signal of 108+/-15 candidates is observed, with a significance that exceeds 8sigma. The mass of the Bc+/- meson is measured to be 6275.6+/-2.9(stat)+/-2.5(syst) MeV/c2. PMID:18518365

  12. Abrupt climate change and collapse of ancient civilizations at 2200BC-2000BC

    Institute of Scientific and Technical Information of China (English)

    WANG Shaowu

    2005-01-01

    Plentiful evidence of historical, archaeological and palaeoclimatic studies proved that an abrupt change from wetter to drier climate occurred over the Nile Valley, the Mesopotamia, the Indus Valley and Huanghe River Valley at 2200BC-2000BC. The abrupt change was developed based on the general lowering of temperature in the middle latitudes, and was a strong cold event since the beginning of the Megathermal (8.5-3.0 kaBP). Collapse of Nile civilization appeared at the First Intermediate Period (2181BC-2040BC). Civilization of Mesopotamia began collapse following the disintegration of Akkadian Empire. This process lasted to the foundation of Babylon Kingdom from 2200BC to 1900BC. Indus civilization abruptly fell off at 1800BC. A widespread alternation of archaeological cultures happened in China at ca. 2000BC except only in its central part. Longsheng culture was replaced by the Erlitou culture, which is now acknowledged in China as Xia Culture. Foundation of Xia Dynasty at 2070BC opened a new chapter in the development of Chinese civilization. Studies indicated that abrupt climate change may be caused by the weakening of the Thermohaline Circulation (THC).

  13. The Pseudomonas aeruginosa CreBC Two-Component System Plays a Major Role in the Response to β-Lactams, Fitness, Biofilm Growth, and Global Regulation

    OpenAIRE

    Zamorano, Laura; Moyà, Bartolomé; Juan, Carlos; Mulet, Xavier; Blázquez, Jesús; Oliver, Antonio

    2014-01-01

    Pseudomonas aeruginosa is a ubiquitous versatile environmental microorganism with a remarkable ability to grow under diverse environmental conditions. Moreover, P. aeruginosa is responsible for life-threatening infections in immunocompromised and cystic fibrosis patients, as the extraordinary capacity of this pathogen to develop antimicrobial resistance dramatically limits our therapeutic arsenal. Its large genome carries an outstanding number of genes belonging to regulatory systems, includi...

  14. Modules over group rings of groups with restrictions on the system of all proper subgroups

    Directory of Open Access Journals (Sweden)

    Olga Dashkova

    2015-12-01

    Full Text Available We consider the class M of R{modules where R is an associative ring. Let A be a module over a group ring RG, G be a group and let L(G be the set of all proper subgroups of G. We suppose that if H 2 L(G then A=CA(H belongs to M. We study an RG{module A such that G 6= G0, CG(A = 1. We consider the cases: 1 M is the class of all artinian R{modules, R is either the ring of integers or the ring of p{adic integers; 2 M is the class of all nite R{modules, R is an associative ring; 3 M is the class of all nite R{modules, R= F is a nite eld.

  15. The direct link model for polymer rings using topological field theory and the second topological moment in dense systems

    International Nuclear Information System (INIS)

    Polymer rings in solution are either permanently entangled or are not. Permanent topological restrictions give rise to additional entropic interactions apart from the ones arising due to mere chain flexibility or excluded volume. Conversely, entangled polymer rings systems may be formed by closing randomly entangled flexible linear chains. The dependence of linking numbers between randomly entangled rings on the chain length, more specifically the second topological moment 2>, i.e. the average squared linking number, may be determined. In this paper, an approach recently discussed in mathematical physics and called Abelian BF theory, is presented which allows one to express the linking constraint in its simplest form, the Gauss integral, in terms of two gauge fields. The model of Brereton and Shah for a single ring entangled with many other surrounding rings is rederived. The latter model is finally used to calculate the second topological moment, in agreement with a recent result by Ferrari, Kleinert, and Lazzizzera obtained using n-component φ4 theory for the limit n→0. (author)

  16. Precision optical systems for the new generation of Ring Imaging Cherenkov detectors in high energy physics experiments

    International Nuclear Information System (INIS)

    High precision optical systems are required for the new generation of Ring Imaging Cherenkov detectors in high energy physics experiments. In the framework of the LHCb and COMPASS experiments, we have started an R and D programme to assess and to eventually overcome the limits of present technologies. Here, we present the available mirror technologies and discuss the optical and mechanical parameters

  17. Substrate integrated waveguide filters with face-to-face broadside-coupled complementary split ring resonators

    OpenAIRE

    Huang, L.; Robertson, ID; Yuan, N

    2013-01-01

    Novel substrate integrated waveguide (SIW) filters using face-to-face oriented broadside-coupled complementary split ring resonators (BC-CSRRs) are presented in this paper. The SIW with the conventional BC-CSRR resonator pairs is first investigated. By removing the metal strip between the two back-to-back rings of the BC-CSRR pair, a modified BC-CSRR pair which shows a significantly improved spurious suppression and a wider rejection bandwidth is then proposed. SIW bandpass filters based on t...

  18. Novel Zinc-Catalytic Systems for Ring-Opening Polymerization of ε-Caprolactone

    Directory of Open Access Journals (Sweden)

    Karolina Żółtowska

    2015-02-01

    Full Text Available Polycaprolactone (PCL is a biodegradable synthetic polymer that is currently widely used in many pharmaceutical and medical applications. In this paper we describe the coordination ring-opening polymerization of ε-caprolactone in the presence of two newly synthesized catalytic systems: diethylzinc/gallic acid and diethylzinc/propyl gallate. The chemical structures of the obtained PCLs were characterized by 1H- or 13C-NMR, FTIR spectroscopy and MALDI TOF mass spectrometry. The average molecular weight of the resulting polyesters was analysed by gel permeation chromatography and a viscosity method. The effects of temperature, reaction time and type of catalytic system on the polymerization process were examined. Linear PCLs with defined average molecular weight were successfully obtained. Importantly, in some cases the presence of macrocyclic products was not observed during the polymerization process. This study provides an effective method for the synthesis of biodegradable polyesters for medical and pharmaceutical applications due to the fact that gallic acid/propyl gallate are commonly used in the pharmaceutical industry.

  19. First observation of a baryonic Bc+ decay.

    Science.gov (United States)

    Aaij, R; Adeva, B; Adinolfi, M; Affolder, A; Ajaltouni, Z; Akar, S; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; Alves, A A; Amato, S; Amerio, S; Amhis, Y; An, L; Anderlini, L; Anderson, J; Andreassen, R; Andreotti, M; Andrews, J E; Appleby, R B; Aquines Gutierrez, O; Archilli, F; Artamonov, A; Artuso, M; Aslanides, E; Auriemma, G; Baalouch, M; Bachmann, S; Back, J J; Badalov, A; Baldini, W; Barlow, R J; Barschel, C; Barsuk, S; Barter, W; Batozskaya, V; Battista, V; Bay, A; Beaucourt, L; Beddow, J; Bedeschi, F; Bediaga, I; Belogurov, S; Belous, K; Belyaev, I; Ben-Haim, E; Bencivenni, G; Benson, S; Benton, J; Berezhnoy, A; Bernet, R; Bettler, M-O; van Beuzekom, M; Bien, A; Bifani, S; Bird, T; Bizzeti, A; Bjørnstad, P M; Blake, T; Blanc, F; Blouw, J; Blusk, S; Bocci, V; Bondar, A; Bondar, N; Bonivento, W; Borghi, S; Borgia, A; Borsato, M; Bowcock, T J V; Bowen, E; Bozzi, C; Brambach, T; van den Brand, J; Bressieux, J; Brett, D; Britsch, M; Britton, T; Brodzicka, J; Brook, N H; Brown, H; Bursche, A; Busetto, G; Buytaert, J; Cadeddu, S; Calabrese, R; Calvi, M; Calvo Gomez, M; Campana, P; Campora Perez, D; Carbone, A; Carboni, G; Cardinale, R; Cardini, A; Carson, L; Carvalho Akiba, K; Casse, G; Cassina, L; Castillo Garcia, L; Cattaneo, M; Cauet, Ch; Cenci, R; Charles, M; Charpentier, Ph; Chefdeville, M; Chen, S; Cheung, S-F; Chiapolini, N; Chrzaszcz, M; Ciba, K; Cid Vidal, X; Ciezarek, G; Clarke, P E L; Clemencic, M; Cliff, H V; Closier, J; Coco, V; Cogan, J; Cogneras, E; Cojocariu, L; Collins, P; Comerma-Montells, A; Contu, A; Cook, A; Coombes, M; Coquereau, S; Corti, G; Corvo, M; Counts, I; Couturier, B; Cowan, G A; Craik, D C; Cruz Torres, M; Cunliffe, S; Currie, R; D'Ambrosio, C; Dalseno, J; David, P; David, P N Y; Davis, A; De Bruyn, K; De Capua, S; De Cian, M; De Miranda, J M; De Paula, L; De Silva, W; De Simone, P; Decamp, D; Deckenhoff, M; Del Buono, L; Déléage, N; Derkach, D; Deschamps, O; Dettori, F; Di Canto, A; Dijkstra, H; Donleavy, S; Dordei, F; Dorigo, M; Dosil Suárez, A; Dossett, D; Dovbnya, A; Dreimanis, K; Dujany, G; Dupertuis, F; Durante, P; Dzhelyadin, R; Dziurda, A; Dzyuba, A; Easo, S; Egede, U; Egorychev, V; Eidelman, S; Eisenhardt, S; Eitschberger, U; Ekelhof, R; Eklund, L; El Rifai, I; Elsasser, Ch; Ely, S; Esen, S; Evans, H-M; Evans, T; Falabella, A; Färber, C; Farinelli, C; Farley, N; Farry, S; Fay, Rf; Ferguson, D; Fernandez Albor, V; Ferreira Rodrigues, F; Ferro-Luzzi, M; Filippov, S; Fiore, M; Fiorini, M; Firlej, M; Fitzpatrick, C; Fiutowski, T; Fontana, M; Fontanelli, F; Forty, R; Francisco, O; Frank, M; Frei, C; Frosini, M; Fu, J; Furfaro, E; Gallas Torreira, A; Galli, D; Gallorini, S; Gambetta, S; Gandelman, M; Gandini, P; Gao, Y; García Pardiñas, J; Garofoli, J; Garra Tico, J; Garrido, L; Gaspar, C; Gauld, R; Gavardi, L; Gavrilov, G; Geraci, A; Gersabeck, E; Gersabeck, M; Gershon, T; Ghez, Ph; Gianelle, A; Giani', S; Gibson, V; Giubega, L; Gligorov, V V; Göbel, C; Golubkov, D; Golutvin, A; Gomes, A; Gotti, C; Grabalosa Gándara, M; Graciani Diaz, R; Granado Cardoso, L A; Graugés, E; Graziani, G; Grecu, A; Greening, E; Gregson, S; Griffith, P; Grillo, L; Grünberg, O; Gui, B; Gushchin, E; Guz, Yu; Gys, T; Hadjivasiliou, C; Haefeli, G; Haen, C; Haines, S C; Hall, S; Hamilton, B; Hampson, T; Han, X; Hansmann-Menzemer, S; Harnew, N; Harnew, S T; Harrison, J; He, J; Head, T; Heijne, V; Hennessy, K; Henrard, P; Henry, L; Hernando Morata, J A; van Herwijnen, E; Heß, M; Hicheur, A; Hill, D; Hoballah, M; Hombach, C; Hulsbergen, W; Hunt, P; Hussain, N; Hutchcroft, D; Hynds, D; Idzik, M; Ilten, P; Jacobsson, R; Jaeger, A; Jalocha, J; Jans, E; Jaton, P; Jawahery, A; Jing, F; John, M; Johnson, D; Jones, C R; Joram, C; Jost, B; Jurik, N; Kaballo, M; Kandybei, S; Kanso, W; Karacson, M; Karbach, T M; Karodia, S; Kelsey, M; Kenyon, I R; Ketel, T; Khanji, B; Khurewathanakul, C; Klaver, S; Klimaszewski, K; Kochebina, O; Kolpin, M; Komarov, I; Koopman, R F; Koppenburg, P; Korolev, M; Kozlinskiy, A; Kravchuk, L; Kreplin, K; Kreps, M; Krocker, G; Krokovny, P; Kruse, F; Kucewicz, W; Kucharczyk, M; Kudryavtsev, V; Kurek, K; Kvaratskheliya, T; La Thi, V N; Lacarrere, D; Lafferty, G; Lai, A; Lambert, D; Lambert, R W; Lanfranchi, G; Langenbruch, C; Langhans, B; Latham, T; Lazzeroni, C; Le Gac, R; van Leerdam, J; Lees, J-P; Lefèvre, R; Leflat, A; Lefrançois, J; Leo, S; Leroy, O; Lesiak, T; Leverington, B; Li, Y; Likhomanenko, T; Liles, M; Lindner, R; Linn, C; Lionetto, F; Liu, B; Lohn, S; Longstaff, I; Lopes, J H; Lopez-March, N; Lowdon, P; Lu, H; Lucchesi, D; Luo, H; Lupato, A; Luppi, E; Lupton, O; Machefert, F; Machikhiliyan, I V; Maciuc, F; Maev, O; Malde, S; Malinin, A; Manca, G; Mancinelli, G; Maratas, J; Marchand, J F; Marconi, U; Marin Benito, C; Marino, P; Märki, R; Marks, J; Martellotti, G; Martens, A; Martín Sánchez, A; Martinelli, M; Martinez Santos, D; Martinez Vidal, F; Martins Tostes, D; Massafferri, A; Matev, R; Mathe, Z; Matteuzzi, C; Mazurov, A; McCann, M; McCarthy, J; McNab, A; McNulty, R; McSkelly, B; Meadows, B; Meier, F; Meissner, M; Merk, M; Milanes, D A; Minard, M-N; Moggi, N; Molina Rodriguez, J; Monteil, S; Morandin, M; Morawski, P; Mordà, A; Morello, M J; Moron, J; Morris, A-B; Mountain, R; Muheim, F; Müller, K; Mussini, M; Muster, B; Naik, P; Nakada, T; Nandakumar, R; Nasteva, I; Needham, M; Neri, N; Neubert, S; Neufeld, N; Neuner, M; Nguyen, A D; Nguyen, T D; Nguyen-Mau, C; Nicol, M; Niess, V; Niet, R; Nikitin, N; Nikodem, T; Novoselov, A; O'Hanlon, D P; Oblakowska-Mucha, A; Obraztsov, V; Oggero, S; Ogilvy, S; Okhrimenko, O; Oldeman, R; Onderwater, G; Orlandea, M; Otalora Goicochea, J M; Owen, P; Oyanguren, A; Pal, B K; Palano, A; Palombo, F; Palutan, M; Panman, J; Papanestis, A; Pappagallo, M; Pappalardo, L L; Parkes, C; Parkinson, C J; Passaleva, G; Patel, G D; Patel, M; Patrignani, C; Pazos Alvarez, A; Pearce, A; Pellegrino, A; Pepe Altarelli, M; Perazzini, S; Perez Trigo, E; Perret, P; Perrin-Terrin, M; Pescatore, L; Pesen, E; Petridis, K; Petrolini, A; Picatoste Olloqui, E; Pietrzyk, B; Pilař, T; Pinci, D; Pistone, A; Playfer, S; Plo Casasus, M; Polci, F; Poluektov, A; Polycarpo, E; Popov, A; Popov, D; Popovici, B; Potterat, C; Price, E; Prisciandaro, J; Pritchard, A; Prouve, C; Pugatch, V; Puig Navarro, A; Punzi, G; Qian, W; Rachwal, B; Rademacker, J H; Rakotomiaramanana, B; Rama, M; Rangel, M S; Raniuk, I; Rauschmayr, N; Raven, G; Reichert, S; Reid, M M; Dos Reis, A C; Ricciardi, S; Richards, S; Rihl, M; Rinnert, K; Rives Molina, V; Roa Romero, D A; Robbe, P; Rodrigues, A B; Rodrigues, E; Rodriguez Perez, P; Roiser, S; Romanovsky, V; Romero Vidal, A; Rotondo, M; Rouvinet, J; Ruf, T; Ruiz, H; Ruiz Valls, P; Saborido Silva, J J; Sagidova, N; Sail, P; Saitta, B; Salustino Guimaraes, V; Sanchez Mayordomo, C; Sanmartin Sedes, B; Santacesaria, R; Santamarina Rios, C; Santovetti, E; Sarti, A; Satriano, C; Satta, A; Saunders, D M; Savrie, M; Savrina, D; Schiller, M; Schindler, H; Schlupp, M; Schmelling, M; Schmidt, B; Schneider, O; Schopper, A; Schune, M-H; Schwemmer, R; Sciascia, B; Sciubba, A; Seco, M; Semennikov, A; Sepp, I; Serra, N; Serrano, J; Sestini, L; Seyfert, P; Shapkin, M; Shapoval, I; Shcheglov, Y; Shears, T; Shekhtman, L; Shevchenko, V; Shires, A; Silva Coutinho, R; Simi, G; Sirendi, M; Skidmore, N; Skwarnicki, T; Smith, N A; Smith, E; Smith, E; Smith, J; Smith, M; Snoek, H; Sokoloff, M D; Soler, F J P; Soomro, F; Souza, D; Souza De Paula, B; Spaan, B; Sparkes, A; Spradlin, P; Sridharan, S; Stagni, F; Stahl, M; Stahl, S; Steinkamp, O; Stenyakin, O; Stevenson, S; Stoica, S; Stone, S; Storaci, B; Stracka, S; Straticiuc, M; Straumann, U; Stroili, R; Subbiah, V K; Sun, L; Sutcliffe, W; Swientek, K; Swientek, S; Syropoulos, V; Szczekowski, M; Szczypka, P; Szilard, D; Szumlak, T; T'Jampens, S; Teklishyn, M; Tellarini, G; Teubert, F; Thomas, C; Thomas, E; van Tilburg, J; Tisserand, V; Tobin, M; Tolk, S; Tomassetti, L; Tonelli, D; Topp-Joergensen, S; Torr, N; Tournefier, E; Tourneur, S; Tran, M T; Tresch, M; Tsaregorodtsev, A; Tsopelas, P; Tuning, N; Ubeda Garcia, M; Ukleja, A; Ustyuzhanin, A; Uwer, U; Vagnoni, V; Valenti, G; Vallier, A; Vazquez Gomez, R; Vazquez Regueiro, P; Vázquez Sierra, C; Vecchi, S; Velthuis, J J; Veltri, M; Veneziano, G; Vesterinen, M; Viaud, B; Vieira, D; Vieites Diaz, M; Vilasis-Cardona, X; Vollhardt, A; Volyanskyy, D; Voong, D; Vorobyev, A; Vorobyev, V; Voß, C; Voss, H; de Vries, J A; Waldi, R; Wallace, C; Wallace, R; Walsh, J; Wandernoth, S; Wang, J; Ward, D R; Watson, N K; Websdale, D; Whitehead, M; Wicht, J; Wiedner, D; Wilkinson, G; Williams, M P; Williams, M; Wilson, F F; Wimberley, J; Wishahi, J; Wislicki, W; Witek, M; Wormser, G; Wotton, S A; Wright, S; Wu, S; Wyllie, K; Xie, Y; Xing, Z; Xu, Z; Yang, Z; Yuan, X; Yushchenko, O; Zangoli, M; Zavertyaev, M; Zhang, L; Zhang, W C; Zhang, Y; Zhelezov, A; Zhokhov, A; Zhong, L; Zvyagin, A

    2014-10-10

    A baryonic decay of the B(c)(+) meson, B(c)(+) → J/ψppπ(+), is observed for the first time, with a significance of 7.3 standard deviations, in pp collision data collected with the LHCb detector and corresponding to an integrated luminosity of 3.0 fb(-1) taken at center-of-mass energies of 7 and 8 TeV. With the B(c)(+) → J/ψπ(+) decay as the normalization channel, the ratio of branching fractions is measured to be B(B(c)(+) → J/ψppπ(+))/B(B(c)(+) → J/ψπ(+)) = 0.143(-0.034)(+0.039)(stat) ± 0.013(syst). The mass of the B(c)(+) meson is determined as M(B(c)(+) = 6274.0 ± 1.8(stat) ± 0.4(syst) MeV/c(2), using the B(c)(+) → J/ψppπ(+) channel. PMID:25375705

  20. Ferro- and antiferro-magnetism in (Np, Pu)BC

    International Nuclear Information System (INIS)

    Two new transuranium metal boron carbides, NpBC and PuBC, have been synthesized. Rietveld refinements of powder XRD patterns of (Np,Pu)BC confirmed in both cases isotypism with the structure type of UBC. Temperature dependent magnetic susceptibility data reveal antiferromagnetic ordering for PuBC below TN = 44 K, whereas ferromagnetic ordering was found for NpBC below TC = 61 K. Heat capacity measurements prove the bulk character of the observed magnetic transition for both compounds. The total energy electronic band structure calculations support formation of the ferromagnetic ground state for NpBC and the antiferromagnetic ground state for PuBC

  1. Group ring cryptography

    CERN Document Server

    Hurley, Barry

    2011-01-01

    Cryptographic systems are derived using units in group rings. Combinations of types of units in group rings give units not of any particular type. This includes cases of taking powers of units and products of such powers and adds the complexity of the {\\em discrete logarithm} problem to the system. The method enables encryption and (error-correcting) coding to be combined within one system. These group ring cryptographic systems may be combined in a neat way with existing cryptographic systems, such as RSA, and a combination has the combined strength of both systems. Examples are given.

  2. Token ring technology report

    CERN Document Server

    2013-01-01

    Please note this is a Short Discount publication. This report provides an overview of the IBM Token-Ring technology and products built by IBM and compatible vendors. It consists of two sections: 1. A summary of the design trade-offs for the IBM Token-Ring. 2. A summary of the products of the major token-ring compatible vendors broken down by adapters and components, wiring systems, testing, and new chip technology.

  3. BC Hydro announces customer service initiatives

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    1998-06-01

    In a continuing effort to improve customer service, convenience and accessibility, BC Hydro announced three significant changes to its operations across the province. The changes involve improved bill paying options, establishment of community energy centres and the creation of networked call centres. The new bill paying option will enable BC Hydro customers to pay by cash or debit card without a service charge at Government Agents of British Columbia facilities which are conveniently located and easily accessible within the communities served by BC Hydro. The utility also plans to establish 17 community energy centres across the province as part of its response to customer`s requests for more accessible service options. Telephone inquiry handling will also be consolidated from more than 40 offices to four call centres located in Prince George, Burnaby, Nanaimo, and Vernon. These call centres will be electronically linked and effectively function as one networked integrated unit for customers to call through one, province-wide telephone number.

  4. Archaeometric study of glass beads from the 2nd century BC cemetery of Numantia

    OpenAIRE

    García Heras, Manuel; Rincoón López, Jesús M.; Alfredo JIMENO MARTÍNEZ; Villegas Broncano, María Angeles

    2003-01-01

    Recent archaeologícalf ieldwork undertaken in the Celtiberian cremation necropolis of Numantia (Soria, Spain) has provided a group of glass beads from the 2nd century BC. Such glass beads were part, together with other metallic and ceramic items, of the offerings deposited with the dead. They are ring-shaped in typology and deep-blue, amber, or semitransparent white in colour. This paper reports results derived from the chemical and microstructural characterization carried out on a representa...

  5. Laser system for cooling of relativistic C3+-ion beams in storage rings

    International Nuclear Information System (INIS)

    Cold ion beams are essential for many precision experiments at storage rings. While spectroscopic experiments gain from the high energy resolution, collision experiments benefit from the increased luminosity. Furthermore, sympathetic cooling of exotic species is conceivable with the aid of cold ion beams. Besides the long established electron cooling, alternative cooling methods are gaining in importance, especially for high energy particles. In the past, experiments to cool ions with lasers were performed. Because of the matching wavelength and output power, frequency doubled Argon-ion lasers at 257 nm were used during these experiments. Due to the strongly limited scanning potential of these systems, it was not possible to cool the full inertia spread of the ion beams. A new laser system was developed in this thesis because of the lack of commercial alternatives. After the characterization of the system, it was tested during a beamtime at the Experimentierspeicherring (ESR) at the Gesellschaft fuer Schwerionenforschung (GSI). The completely solid state based system delivers up to 180 mW of output power at 257 nm and is modehop free tunable up to 16 GHz in 10 ms at this wavelength. By using efficient diode lasers, the new system consumes considerably less power than comparable Argon-ion lasers. The fundamental wavelength of 1028 nm is amplified up to 16 W with an Yb-doped fiber amplifier. Subsequently, the target wavelength of 257 nm is realized in two consecutive build-up cavities. Another diode laser, stabilized to a wavelength meter, serves as a frequency reference. This new laser system first came to operation during beamtime in August 2012, when relativistic C3+ ions with β=0.47 were cooled successfully. For the first time it was possible to access the whole inertia spread of a bunched ion beam without electron precooling. In contrast to prior experiments, only the laser frequency was scanned and not the bunching frequency of the ion beam. The results for

  6. Aharonov-Bohm effect in an electron-hole graphene ring system

    OpenAIRE

    D. Smirnov; Schmidt, H; Haug, R. J.

    2012-01-01

    Aharonov-Bohm oscillations are observed in a graphene quantum ring with a top gate covering one arm of the ring. As graphene is a gapless semiconductor this geometry allows to study not only the quantum interference of electrons with electrons or holes with holes but also the unique situation of quantum interference between electrons and holes. The period and amplitude of the observed Aharonov-Bohm oscillations are independent of the sign of the applied gate voltage showing the equivalence be...

  7. Intravaginal rings as delivery systems for microbicides and multipurpose prevention technologies

    Directory of Open Access Journals (Sweden)

    Thurman AR

    2013-10-01

    Full Text Available Andrea Ries Thurman, Meredith R Clark, Jennifer Hurlburt, Gustavo F Doncel CONRAD, Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Norfolk, VA, USA Abstract: There is a renewed interest in delivering pharmaceutical products via intravaginal rings (IVRs. IVRs are flexible torus-shaped drug delivery systems that can be easily inserted and removed by the woman and that provide both sustained and controlled drug release, lasting for several weeks to several months. In terms of women's health care products, it has been established that IVRs effectively deliver contraceptive steroids and steroids for the treatment of postmenopausal vaginal atrophy. A novel application for IVRs is the delivery of antiretroviral drugs for the prevention of human immunodeficiency virus (HIV genital infection. Microbicides are antiviral drugs delivered topically for HIV prevention. Recent reviews of microbicide IVRs have focused on technologies in development and optimizing ring design. IVRs have several advantages, including the ability to deliver sustained drug doses for long periods of time while bypassing first pass metabolism in the gut. IVRs are discreet, woman-controlled, and do not require a trained provider for placement or fitting. Previous data support that women and their male sexual partners find IVRs highly acceptable. Multipurpose prevention technology (MPT products provide protection against unintended/mistimed pregnancy and reproductive tract infections, including HIV. Several MPT IVRs are currently in development. Early clinical testing of new microbicide and MPT IVRs will require a focus on safety, pharmacokinetics and pharmacodynamics. Specifically, IVRs will have to deliver tissue concentrations of drugs that are pharmacodynamically active, do not cause mucosal alterations or inflammation, and do not change the resident microbiota. The emergence of resistance to antiretrovirals will need to be investigated. IVRs should not

  8. Evolution of the rf systems layout for the SSC collider rings

    International Nuclear Information System (INIS)

    This note contains information on the results of ongoing reviews concerning the basic design of the 360-MHz rf systems for the 2 x 20 TeV Superconducting Super Collider (SSC). For generation of 20-MV peak voltage per ring, with proton beams of 2 x 70 mA, several versions have been investigated: Version A (baseline design and modified baseline): 2 x 8 five-cell normalconducting cavities; Version B: 2 x 24 single-cell normalconducting cavities; and Version C: 2 x 8 or 2 x 10 single-cell superconducting cavities. For reasons of easier High Order Mode (HOM) damping, multicell cavities have been found inferior in performance when compared to single cells. Superconducting cavities have been found superior in handling transient beam loading when compared to normalconducting cavities. A threefold higher voltage, and a reduced R/Q value of superconducting cells lead to a ninefold increase in stored electromagnetic energy which, by the same factor, reduces the speed of phase changes originating from notches in the circulating beams. The theoretical possibility to operate superconducting cavities half-detuned in order to supply reactive power to the beam may also lead to considerable savings in overall power consumption. On the other hand, many challenges are involved with the use of superconducting cavities, such as the delicacy of the superconductive state, the complexity of cryostat design and operation, tuning requirements, sensitivity to vibration, and other issues

  9. BC Hydro best practices : energy efficiency and integrated planning

    International Nuclear Information System (INIS)

    The key elements to success in energy efficiency include integrated energy planning, a review of conservation potential, pursuing a target, risk sharing between all parties, and long term planning when making investments in demand side management (DSM). The barriers to cost effective energy efficiency investment were also outlined along with the scope of the conservation potential review which included 95 per cent of electricity end use applications in all market sectors including residential, commercial, institutional and industrial. BC Hydro's Power Smart program focuses on energy efficiency and load displacement to meet 35 per cent of the utility's forecasted growth by 2012. The sources of savings within each of the market sectors were identified. Key recommendations regarding energy efficiency and conservation were also presented with reference to financial incentives offered by BC Hydro to consumers to encourage a switch to more efficient lighting systems. 10 figs

  10. TechBC Memory Project: Tom Calvert

    OpenAIRE

    Hendrigan, Holly

    2015-01-01

    Tom Calvert is the subject of this interview. He took a leave from his administrative roles at SFU in December 1997 to be the Vice President, Research, at TechBC. One of the first 10 or so TechBC employees, he started in the "Gateway" offices. After SFU assumed administrative control in 2002, he became the Academic Program Director for the Interactive Arts and Information Technology streams. He worked in administration in the School of Interactive Arts and Technology (SIAT) and remains a Prof...

  11. Structural forms of cubic BC2N

    International Nuclear Information System (INIS)

    Superhard cubic boron-carbonitrides (c-BC2N) are studied with the use of the ab initio pseudopotential density functional method. The total energy, lattice constant, bulk and shear moduli, and electronic band structures as well as the electron density of states are calculated for all the possible c-BC2N structures in an eight-atom zinc-blende-structured cubic unit cell. The results obtained provide a plausible explanation for recent experimental observations as well as a possible path to synthesis of the materials

  12. Parameterization of a multiagent system for roof edge detection: an application to growth ring detection on fish otoliths

    Science.gov (United States)

    Guillaud, Anne; Benzinou, Abdessalam; Troadec, Herve; Rodin, Vincent; Le Bihan, Jean

    2000-03-01

    In this paper we present a method of segmentation using a multiagent system, and an application to fish otolith growth ring detection. The otoliths images are composed of alternative concentric dark and light rings, the number of which increases with the age of the fish. Up to now, the identification of growth rings, for age estimation, is routinely achieved by human readers, but this task is tedious and depends on the reader's subjectivity. The system proposed here is composed of several agents whose individual task is to detect local extremes on a grayscale image. For this aim the agents are provided with sensors on the gray levels of the image. By computing the mean gray level of two sensors placed in front of it, the agent, if it searches for light rings (respectively dark) will decide to turn in the direction of the lighter (respectively darker) sensor. The path of the agents has been tested as a roof edge detector, using the Canny criteria: good detection, good localization, and low multiple response, in order to choose the best parameters ruling the agents behavior, according to the image structures. Tests have been first achieved on synthetic images, and then on otoliths images.

  13. Ring theory

    CERN Document Server

    Rowen, Louis H

    1991-01-01

    This is an abridged edition of the author's previous two-volume work, Ring Theory, which concentrates on essential material for a general ring theory course while ommitting much of the material intended for ring theory specialists. It has been praised by reviewers:**""As a textbook for graduate students, Ring Theory joins the best....The experts will find several attractive and pleasant features in Ring Theory. The most noteworthy is the inclusion, usually in supplements and appendices, of many useful constructions which are hard to locate outside of the original sources....The audience of non

  14. Homorooty in Rings

    Directory of Open Access Journals (Sweden)

    M. H. Hooshmand

    2010-03-01

    Full Text Available The topic of ”Homorooty” (for integer numbers has been introduced and studied in [2]. There are some applications of the homorooty in studying and solving some Diophantine equations and systems, as an interesting and useful elementary method. As a continuation of the Homorooty, we consider it for arbitrary rings and will study its properties in different rings, especially UFD and homorooty rings (which will be introduced. At last we shall state some applications of homorooty in studying some equations over homorooty rings

  15. Monitoring and control system of B-PS and S-PS fault interlock in the storage ring of SSRF

    International Nuclear Information System (INIS)

    In this paper, we report the local monitor and control system of fault interlock based on software design of S7-200 and S7-300 according to characteristics of the B-PS and S-PS in storage ring of SSRF. The remote monitor and control system based on EPICS are presented. The system architecture and key technologies in hardware and software designs are expatiated. Advantages of the system include the friendly interface and simple operation. The system has been working stably. (authors)

  16. On the Centro-symmetric Solution of a System of Matrix Equations over a Regular Ring with Identity

    Institute of Scientific and Technical Information of China (English)

    Qingwen Wang; Haixia Chang; Chunyan Lin

    2007-01-01

    In this paper, we find the centro-symmetric solution of a system of matrix equations over an arbitrary regular ring R with identity. We first derive some necessary and sufficient conditions for the existence and an explicit expression of the general solution of the system of matrix equations A1X1 = C1, A2X1 = C2, A3X2 = C3, A4X2 = C4 and A5X1B5 + A6X2B6= C5 over R. By using the above results, we establish two criteria for the existence and the representation of the general centro-symmetric solution of the system of matrix equations AaX = Ca, AbX = Cb and AcXBc = Cc over the ring R.

  17. On hadronic production of the Bc meson

    International Nuclear Information System (INIS)

    Various approaches to the hadronic productions of the double heavy meson Bc are investigated in this paper. The resultant cross sections obtained by the approaches are compared with in several aspects. One may see that the differences are quite substantial. The advantages and shortcomings of the approaches are discussed. (author). 17 refs, 4 figs

  18. Kondo Resonance versus Fano Interference in Double Quantum Dots Coupled to a Two-Lead One-Ring System

    Institute of Scientific and Technical Information of China (English)

    CHEN Xiong-Wen; SHI Zhen-Gang; CHEN Bao-Ju; SONG Ke-Hui

    2007-01-01

    We analyse the transport properties of a coupled double quantum dot (DQD) device with one of the dots (QD1) coupled to metallic leads and the other (QD2) embedded in an Aharonov-Bhom (A-B) ring by means of the slave-boson mean-Geld theory. It is found that in this system, the Kondo resonance and the Fano interference exist simultaneously, the enhancing Kondo effect and the increasing hopping of the QD2-Ring destroy the localized electron state in the QD2 for the QD1-leads, and accordingly, the Fano interference between the DQD-leads and the QD1-leads are suppressed. Under some conditions, the Fano interference can be quenched fully and the single Kondo resonance of the QD1-leads comes into being. Moreover, when the magnetic flux of the A-B ring is zero, the influence of the parity of the A-B ring on the transport properties is very weak, but this inSuence becomes more obvious with non-zero magnetic flux. Thus this model may be a candidate for future device applications.

  19. Identification and quantification of the halogenated natural product BC-3

    Energy Technology Data Exchange (ETDEWEB)

    Melcher, J.; Olbrich, D.; Vetter, W. [Hohenheim Univ., Stuttgart (Germany). Inst. fuer Lebensmittelchemie; Marsh, G. [Stockholm Univ. (Sweden). Dept. of Environmental Chemistry; Gaus, C.; Mueller, J.F. [National Research Centre for Environmental Toxicology, Coopers Plains (Australia)

    2004-09-15

    Halogenated natural products (HNPs) of marine origin are increasingly recognized as critical residues in foodstuff (e. g. fish) and environmental samples (e. g. marine mammals and birds). Some of these HNPs (Q1, MHC-1, BC-2, and HDBPs including BC-10) were detected in diverse fish and marine mammal samples at concentrations sometimes exceeding those of PCBs, DDT, and other anthropogenic pollutants. Recent studies with marine mammal samples from Australia led to the detection of six abundant HNPs (Q1, BC-1, BC-2, BC-3, BC-10, and BC-11). In the meantime, Q1 was identified as heptachloro-1{sup '}-methyl-1,2{sup '}-bipyrrole, BC-2 as 4,6-dibromo-2-(2{sup '},4{sup '}-dibromo)phenoxyanisole, BC- 10 as 1,1{sup '}-dimethyl-3,3{sup '},4,4{sup '}-tetrabromo-5,5{sup '}-dichloro-2,2{sup '}-bipyrrole, and BC-11 as 3,5-dibromo- 2-(3{sup '},5{sup '}-dibromo,2{sup '}-methoxy)phenoxyanisole. However the identity of BC-1 and BC-3 remained unclear. The goal of the present study was the identification of BC-3. The tetrabromo compound BC-3 has previously been detected in marine mammals from four continents. Furthermore, we attempted establishing quantitative concentrations in diverse marine biota samples.

  20. BC Hydro triple bottom line report 2002

    International Nuclear Information System (INIS)

    British Columbia Hydro (BC Hydro) published this document which measures the environmental, social and economic performance of the company. It is a complement to BC Hydro's 2002 Annual Report. The report was prepared to better understand the company's business in terms of its commitment to being an environmentally, socially, and economically responsible company (the three bottom lines). BC Hydro proved its ability to integrate the three bottom lines in decision making processes by carefully examining the environmental, social and economical impacts of programs such as Power Smart, Green and Alternative Energy, and Water Use Planning. All indicators point to BC Hydro achieving its commitment of providing a minimum of 10 per cent of new demand through 2010 with new green energy sources. Water Use Plans were developed for hydroelectric generating stations, and they should all be in place by 2003. Efficiencies realised through the Power Smart program offset the increases in greenhouse gas associated with increased energy demand. Juvenile sturgeon raised in a hatchery were released into the Columbia River in May 2002. The completion of a 40-kilometre trail on the Sunshine Coast was helped by a financial contribution from BC Hydro in the amount of 23,000 dollars. Safety improvements were implemented at eight facilities, such as dam remediation, dam surveillance and instrumentation updates. Scholarships were awarded across the province, along with additional donations to non-profit organizations. Co-op positions were provided for 150 students. Internal energy efficiency programs were successful. Planning is under way for significant maintenance work and equipment replacement projects as the transmission and distribution infrastructure ages. The number of reported indicators was expanded this year. In turn, they were aligned with the revised Global Reporting Initiative (GRI) guidelines. tabs

  1. Recommendations and responses to home and community care: The BC Ombudsperson Report

    OpenAIRE

    Carter, Kim

    2012-01-01

    This video clip comprises the Free Public Lecture, "Recommendations and responses to home and community care: The BC Ombudsperson Report," held at the 21st Annual John K. Friesen Conference, "Innovations in Home Care: A Public Policy Perspective," MAY 16-17, 2012, Vancouver, BC.  Presented by Kim Carter, Ombudsperson, for the Province of British Columbia. It is well known that jurisdictions with more comprehensive and integrated home care delivery systems are able to extend ...

  2. Using a double-frequency RF system to facilitate on-axis beam accumulation in a storage ring

    CERN Document Server

    Jiang, B C; Tian, S Q; Zhang, M Z; Zhang, Q L

    2016-01-01

    An on-axis injection scheme using a double-frequency RF system in a storage ring with small dynamic aperture is proposed. By altering RF voltages, empty RF buckets can be created which will be used for on-axis injection. After bunches are injected, a reverse RF voltage altering process is performed and the injected bunches can be longitudinally dumped to the main RF buckets. The scheme allows reaping the advantages of the on-axis injection while still performing accumulation.

  3. Formation of diverse ring-satellite systems around Centaurs through tidal disruption at close encounters with giant planet

    CERN Document Server

    Hyodo, Ryuki; Genda, Hidenori; Ohtsuki, Keiji

    2016-01-01

    Centaurs are minor planets orbiting between Jupiter and Neptune that have or had crossing orbits with one or more giant planets. Recent observations and reinterpretation of previous observations have revealed the existence of ring systems around 10199 Chariklo and 2060 Chiron. However, the origin of the ring systems around such a minor planet is still an open question. Here, we propose that the tidal disruption of a differentiated object that experiences a close encounter with a giant planet could naturally form diverse ring-satellite systems around the Centaurs. During the close encounter, the icy mantle of the passing object is preferentially ripped off by the planet's tidal force and the debris is distributed mostly within the Roche limit of the largest remnant body. Assuming the existence of $20-50$wt% silicate core below the icy mantle, a disk of particles is formed when the objects pass within $0.4-0.8$ of the planet's Roche limit with the relative velocity at infinity $3-6$km s$^{-1}$ and 8h initial sp...

  4. Simulation of Arctic Black Carbon using Hemispheric CMAQ: Role of Russia's BC Emissions, Transport, and Deposition

    Science.gov (United States)

    Huang, K.; Fu, J. S.

    2015-12-01

    Black carbon plays a unique role in the Arctic climate system due to its multiple effects. It causes Arctic warming by directly absorbing sunlight from space and by darkening the surface albedo of snow and ice, which indirectly leads to further warming and melting, thus inducing an Arctic amplification effect. BC depositions over the Arctic are more sensitive to regions in close proximity. In this study, we reconstruct BC emissions for Russian Federation, which is the country that occupies the largest area in the Arctic Circle. Local Russia information such as activity data, emission factors and other emission source data are used. In 2010, total anthropogenic BC emission of Russia is estimated to be around 254 Gg. Gas flaring, a commonly ignored black carbon source, contributes a dominant 43.9% of Russia's total anthropogenic BC emissions. Other sectors, i.e., residential, transportation, industry, and power plants, contribute 22.0%, 17.8%, 11.5%, and 4.8%, respectively. BC simulations were conducted using the hemispheric version of CMAQ with polar projection. Emission inputs are from a global emissions database EDGAR (Emissions Database for Global Atmospheric Research)-HTAPv2 (Hemispheric Transport of Air Pollution) and EDGAR-HTAPv2 with its Russian part replaced by the newly developed Russian BC emissions, respectively. The simulations using the new Russian BC emission inventory could improve 46 - 61% of the Absorption Aerosol Optical Depth (AAOD) measured at the AERONET sites in Russia throughout the whole year as compared to that using the default HTAPv2 emissions. At the four air monitoring sites (Zeppelin, Barrow, Alert, and Tiksi) in the Arctic Circle, surface BC simulations are improved the most during the Arctic haze periods (October - March). Emission perturbation studies show that Russia's BC emissions contribute over 50% of the surface BC concentrations over the Arctic during the cold seasons. This study demonstrates the good capability of H-CMAQ in

  5. A European geomagnetic field model from 6000 BC to 1000 BC

    International Nuclear Information System (INIS)

    Complete text of publication follows. We propose a new regional geomagnetic model for the European Continent valid from 6000 BC to 1000 BC. The model is based on a selected compilation of sedimentary and archaeomagnetic data. First we have tested the accuracy of sedimentary records sited in western and northern Europe by using the regional European model SCHA.DIF.3K. Two criteria of rejection has been used: 1) we have eliminated those sedimentary records that have a wide scattering (angular deviations over 40 deg), 2) we have compared the available sedimentary data that covered the last 3000 years (from 1000 BC to 1900 AD) with the geomagnetic field components provided by the regional European SCHA.DIF.3K archaeomagnetic model. A filter of 150 years has been applied over the expected values given by the regional archaeomagnetic model to simulate the smoothing of the sedimentary record. The selected sedimentary database and the last version of the Bulgarian archaeomagnetic database have been used to develop a low degree regional model using the Spherical Cap Harmonic Analysis technique in the European region. This model, called SCHA.DIF.8K, provides information about the direction (declination and inclination) and intensity of the Earth's Magnetic Field in Europe during 5000 years, from 6000 BC to 1000 BC, connecting with the SCHA.DIF.3K model valid from 1000 BC to 1900 AD.

  6. Evolutionary concepts in biobanking - the BC BioLibrary

    Directory of Open Access Journals (Sweden)

    Hegele Richard G

    2009-11-01

    Full Text Available Abstract Background Medical research to improve health care faces a major problem in the relatively limited availability of adequately annotated and collected biospecimens. This limitation is creating a growing gap between the pace of scientific advances and successful exploitation of this knowledge. Biobanks are an important conduit for transfer of biospecimens (tissues, blood, body fluids and related health data to research. They have evolved outside of the historical source of tissue biospecimens, clinical pathology archives. Research biobanks have developed advanced standards, protocols, databases, and mechanisms to interface with researchers seeking biospecimens. However, biobanks are often limited in their capacity and ability to ensure quality in the face of increasing demand. Our strategy to enhance both capacity and quality in research biobanking is to create a new framework that repatriates the activity of biospecimen accrual for biobanks to clinical pathology. Methods The British Columbia (BC BioLibrary is a framework to maximize the accrual of high-quality, annotated biospecimens into biobanks. The BC BioLibrary design primarily encompasses: 1 specialized biospecimen collection units embedded within clinical pathology and linked to a biospecimen distribution system that serves biobanks; 2 a systematic process to connect potential donors with biobanks, and to connect biobanks with consented biospecimens; and 3 interdisciplinary governance and oversight informed by public opinion. Results The BC BioLibrary has been embraced by biobanking leaders and translational researchers throughout BC, across multiple health authorities, institutions, and disciplines. An initial pilot network of three Biospecimen Collection Units has been successfully established. In addition, two public deliberation events have been held to obtain input from the public on the BioLibrary and on issues including consent, collection of biospecimens and governance

  7. Role of recBC nuclease in Escherichia coli transformation.

    OpenAIRE

    Hoekstra, W P; Bergmans, J E; Zuidweg, E.M.

    1980-01-01

    In Escherichia coli transformation with linear donor deoxyribonucleic acid, the recBC pathway is functional, but genetic analysis shows that the recBC nuclease is deleterious to linear deoxyribonucleic acid.

  8. BC energy plan : report on progress

    International Nuclear Information System (INIS)

    The Ministry of Energy, Mines and Petroleum Resources announced the British Columbia (BC) energy plan entitled a vision for clean energy leadership in 2007. This report presented progress made towards the plan and outlined the work completed to date in achieving the goals and targets set out in the energy plan. The report also provided a snapshot of how BC was working with First Nations, industry and communities to develop innovative, sustainable energy solutions for British Columbians. The report presented highlights on progress in terms of building the BC economy; developing clean energy solutions; and energy security. Environmental leadership was discussed in terms of combating climate change through legislation and leading the way in clean energy solutions. Other topics that were presented included investing in innovation; a strong commitment to energy conservation and efficiency; and oil and gas development. It was concluded that through sustainable, responsible resource management, a secure, affordable energy supply will be ensured while preserving the bounty and beauty of British Columbia for many generations to come. tabs., figs

  9. Comparative study of the results of compound tibial shaft fractures treated by Ilizarov ring fixators and limb reconstruction system fixators

    Institute of Scientific and Technical Information of China (English)

    Chandra Prakash Pal; Harish Kumar; Deepak Kumar; K.S.Dinkar; Vivek Mittal; Naveen Kumar Singh

    2015-01-01

    Purpose: Ilizarov ring fixator and limb reconstruction system (LRS) fixators have been used in the management of complex tibial fractures with severe soft tissue injuries, compound tibial fractures, and infected tibial nonunion for which conventional internal fixation cannot be contemplated.Fracture union and distraction osteogenesis can be done simultaneously with these external fixators, allowing early weight bearing.Several previous studies have shown almost equal results of rail and ring fixators for the compound tibial shaft fractures.Thus we performed a prospective study to evaluate the union rate, functional outcome and amount of limb lengthening after the treatment of compound tibial shaft fractures with or without infected nonunion by ring or LRS fixators.Methods: This prospective study was done at Sarojini Naidu Medical College and Hospital, Agra, India and included 32 patients of compound tibial shaft fractures with or without infected nonunion.There were 26 males and 6 females and the average age was 40 years.Patients were randomly divided into two groups (n =16 for each): one underwent Ilizarov fixation and the other received LRS fixation.Cases were followed up for 3-24 months, 6 months on average from September 2012 to October 2014.Functional and radiological outcomes were assessed using the Association for the Study and Application of Methods of Ilizarov (ASAMI) criteria for both rail and ring fixators.Results: Union was achieved in all cases.Radiological outcome was found excellent in 68.75%, good in 18.75% and fair in 12.50% of cases treated by rail fixators whereas it was excellent in 56.25%, good in 18.75%, fair in 12.50% and poor in 12.50% of cases treated by ring fixators.Functional result was satisfactory in 75.00% of cases treated by rail fixator and 68.75% of cases treated by ring fixators whereas the corresponding rate of unsatisfactory was 25.00% vs.31.25%.Conclusion: In our short-term assessment, LRS fixators show a

  10. Bc-meson production in hadron-hadron collisions

    International Nuclear Information System (INIS)

    The Bc-meson production cross section was calculated in the perturbative QCD. Various distributions of the charged leptons from the Bc → lνJ/ψ(→l+l-) decay were obtained. The Bc-meson mass measurement from such decays is also discussed. 17 refs., 9 figs., 1 tab

  11. Analysis and design modifications for upgrade of storage ring bump pulse system driving the injection bump magnets at the ALS

    International Nuclear Information System (INIS)

    A fast (4.0 ms half period) resonant discharge pulse system, using SCRs, was designed and constructed to drive the injection bump magnet system at the Advanced Light Source (ALS). The commissioning process revealed a high frequency resonance (T= 800 NS) superimposed on the driver discharge wave form. In addition, the peak amplitude of the magnet load recovery current exceeded design specifications. A SPICE analysis confirmed the suspected mechanisms for the parasitic ringing and the excessive load current(openquotes)undershoot(closequotes). This paper will address the subsequent analysis, measurements, and modifications carried out during the maintenance shutdown in June 1993

  12. Non-linearity correction of Schottky diode THz detector system using CSR burst from storage ring

    International Nuclear Information System (INIS)

    We show a practical method to calibrate non-linearity of Schottky diode detector for the short-pulsed THz radiation from the electron storage ring. A frequency distribution of pulse area was measured at three distances of the detector from the radiation source. Non-linearity correction function was obtained by a condition that the three distribution should be the same with non-linearity correction and reduction factor by the distance. (author)

  13. PALLADIUM-CATALYZED ROUTE TO NOVEL FIVE- AND SIX-CYCLIC HETEROCYCLIC SYSTEMS CONTAINING THIAZOLE, IMIDAZOLE AND OXEPINE RINGS Palladium-katalysierten Weg zu neuen Fünf-und Sechs-CYCLIC HETEROCYCLISCHE Systemen mit Thiazol, Imidazol UND oxepin RINGS

    Directory of Open Access Journals (Sweden)

    Tatjana Beresneva, Sergey Belyakov, Edgars Abele

    2012-01-01

    Full Text Available Novel and simple two step catalytic method for the preparation of novel five- and sixcyclic heterocyclic systems containing thiazole, imidazole and oxepine rings from 3- chloromethylbenzo[4,5]imidazo[2,1-b]thiazole and o-bromobenzyl alcohols or 2-bromo-3- hydroxymethylpyridine was described.

  14. Motion around a monopole + ring system: I. stability of equatorial circular orbits vs regularity of three-dimensional motion

    Energy Technology Data Exchange (ETDEWEB)

    Ramos-Caro, Javier; Letelier, Patricio S. [Universidade Estadual de Campinas (UNICAMP), SP (Brazil); Pedraza, Juan F. [University of Texas at Austin, TX (United States)

    2011-07-01

    Full text: We study the motion of test particles around a center of attraction represented by a monopole (with and without spheroidal deformation) surrounded by a ring, given as a superposition of Morgan and Morgan discs. We deal with two kinds of bounded orbits: (i) Equatorial circular orbits and (ii) general three-dimensional orbits. The first case provides a method to perform a linear stability analysis of these structures by studying the behavior of vertical and epicyclical frequencies as functions of the mass ratio, the size of the ring and/or the quadrupolar deformation. In the second case, we study the influence of these parameters in the regularity or chaoticity of motion. We find that there is a close connection between linear stability (or un- stability) of structures and regularity (or chaoticity) of the three-dimensional motion. This result suggests, in a very first approximation, an explanation for the stability of some known structures of the solar system which can be described as a monopole plus a ring with axial symmetry. (author)

  15. Improvement of PLC-based data acquisition system for beam loss monitors of the J-PARC main ring

    International Nuclear Information System (INIS)

    A data acquisition system of the beam loss monitor of J-PARC Main Ring consists of the combination of Programmable Logic Controller (PLC). The system needs the high speed response to an external trigger. So we use high speed data acquisition modules to get output data from the beam loss monitor. Triggered by an external trigger pulse, the system begins to acquire the data with some pre-defined intervals by the signal which the system itself generates. We use the new type of a CPU module of PLC, in which an embedded EPICS system on the Linux OS. With the new type of a CPU module, the data acquisition system becomes simpler. This paper reports the state of development and the result in operation. (author)

  16. The arena of multiinterest, governance and fraud – A critical review of BC bailout

    Directory of Open Access Journals (Sweden)

    Ruddy Tri Santoso

    2014-06-01

    Full Text Available The bailout of PT. Bank Century (BC at the end of 2008 ignites many debates. If the Indonesian Central Bank had not bailed it out, would it have been a systemic disaster for Indonesian economic? BC’s total assets were not significant to the national banking asset. Why was it so important to bail BC out? This research wants to find answers to the following questions: 1 considering the internal problems of BC since 2005, was it worth to bail it out, and was the amount paid appropriate? 2 How bad was the internal problem in consideration of corporate governance theory, fraud theory, and in accordance with prudential banking principals? 3 Was the decision to bail out relevant for the national banking stabilization? 4 Was the failure of BC in 2008 a symptom of market failure, or a governance failure of BC and a regulation failure of the Indonesian Central Bank? This research uses descriptive qualitative method by in-depth analysis. The qualitative variables are classified to some significant factors which influence the decision to bail out. The result of this research shows that the historical performance, the corporate government and the fraud of the bank were not appropriately reviewed before the government decided to bail BC out. Even though the bailout was able to keep the national banking stabile at that time, the judgment of the decision was not purely economic. The non-economic factor was that the bank was too politically significant to fail.

  17. Design of a transverse feedback system against multi bunch beam oscillation due to impedance in the KEK B-factory rings

    International Nuclear Information System (INIS)

    In future B-factories, many bunches will be circulated in their rings, and thus making the bunch spacing to become very short compared with that of the present collider machines. The impedance of the rings may cause many coupled bunch beam oscillations. One possibility to damp these multi-bunch oscillations is to install an active oscillation feedback damper system. This paper discusses the transverse feedback system. (author)

  18. SUPRAMITRAL RING

    Directory of Open Access Journals (Sweden)

    Rajesh G

    2011-11-01

    Full Text Available Supra mitral ring is a rare cause for congenital mitral valve obstr uction. The reported incidence of supramitral ring is 0.2-0.4% in general population and 8% in patients with congenital mitral valve disease. The condition is characterized by an abnormal ridge of connective tissue often circumferential in shape ,on the atrial side of the mitral valve encroaching on the orifice of the mitral valve. It may adhere to the leaflets of the valve and restrict their movements. Although a supramitral ring may be rarely nonobstructive, it often results in mitral valve inflow obstruction.

  19. Ferro- and antiferro-magnetism in (Np, Pu)BC

    Energy Technology Data Exchange (ETDEWEB)

    Klimczuk, T., E-mail: tomasz.klimczuk@pg.gda.pl [European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, 76125 Karlsruhe (Germany); Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk (Poland); Shick, A. B. [Institute of Physics, ASCR, Na Slovance 2, CZ-18221 Prague (Czech Republic); Kozub, A. L. [Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk (Poland); Institute of Physics, ASCR, Na Slovance 2, CZ-18221 Prague (Czech Republic); Griveau, J.-C.; Colineau, E.; Wastin, F. [European Commission, Joint Research Centre (JRC), Institute for Transuranium Elements (ITU), Postfach 2340, 76125 Karlsruhe (Germany); Falmbigl, M.; Rogl, P., E-mail: peter.franz.rogl@univie.ac.at [Institute for Physical Chemistry, University Vienna, Währingerstrasse 42, A-1090 Wien (Austria)

    2015-04-01

    Two new transuranium metal boron carbides, NpBC and PuBC, have been synthesized. Rietveld refinements of powder XRD patterns of (Np,Pu)BC confirmed in both cases isotypism with the structure type of UBC. Temperature dependent magnetic susceptibility data reveal antiferromagnetic ordering for PuBC below T{sub N} = 44 K, whereas ferromagnetic ordering was found for NpBC below T{sub C} = 61 K. Heat capacity measurements prove the bulk character of the observed magnetic transition for both compounds. The total energy electronic band structure calculations support formation of the ferromagnetic ground state for NpBC and the antiferromagnetic ground state for PuBC.

  20. A silicon photonics circuit based on micro-ring resonators in the instantaneous frequency measurement system

    Science.gov (United States)

    Wang, Wanjun; Zhou, Jie; Wang, Jun; Feng, Junbo; Guo, Jin

    2015-10-01

    In this paper, a compact silicon photonics circuit is proposed. It consists of add-drop filter, input/output grating coupler. The resonance peak of add-drop filter can be tuned with the assist of p-i-n diode. The unknown frequency of microwave is loaded at the optical wave and coupled into the chip. The optical power ratio of through port and drop port is monotonous, which is corresponding to the unknown frequency. Meanwhile, the resonance peak of the ring can shift with the assist of p-i-n diode.

  1. Design and Analysis of Drive System with Slip Ring Induction Motor for Electric Traction in India

    OpenAIRE

    Nagamani Chandra sekara; Somanatham R; Chaitanya Kumar U

    2015-01-01

    The use of Squirrel Cage for Traction has revolutionised the motive power of a Locomotive. The Asynchronous Motor is rugged with high starting Torque, has a very smooth Voltage and Speed control as compared to a DC Series Motor. When looking at the Traction perspective, a Slip Ring Induction Motor can be an alternative to the Squirrel Cage Motor as it has higher starting Torque and better efficiency than a Squirrel Cage Motor. the Slip Power Recovery scheme also plays a proactive role as ther...

  2. Liquid ring vacuum pumps, compressors and systems conventional and hermetic design

    CERN Document Server

    Bannwarth, Helmut

    2006-01-01

    Based on the very successful German editions, this English version has been thoroughly updated and revised to reflect the developments of the last years and the latest innovations in the field.Throughout, the author makes excellent use of real-life examples and highly praised didactics to disseminate his expert knowledge needed by vacuum technology users and engineers in their daily work at industrial plants, as consultants or in design offices. He covers in detail the most modern liquid ring pumps, with chapters dedicated to maintenance, explosion prevention and general procedures for saf

  3. Rectangular Ring Antenna Excited by Circular Disc Monopole for WiMAX System

    OpenAIRE

    Souphanna Vongsack; Chuwong Phongcharoenpanich; Sompol Kosulvit; Kazuhiko Hamamoto; Toshio Wakabayashi

    2014-01-01

    This research presents a rectangular ring antenna excited by a circular disc monopole (CDM) mounted in front of a square reflector. The proposed antenna is designed to cover a frequency range of 2.300–5.825 GHz and thereby is suitable for WiMAX applications. Multiple parametric studies were carried out using the CST Microwave Studio simulation program. A prototype antenna was fabricated and experimented. The measurements were taken and compared with the simulation results, which indicates goo...

  4. Space-Time Convolutional Codes over Finite Fields and Rings for Systems with Large Diversity Order

    Directory of Open Access Journals (Sweden)

    Uchôa-Filho BF

    2008-01-01

    Full Text Available Abstract We propose a convolutional encoder over the finite ring of integers modulo , where is a prime number and is any positive integer, to generate a space-time convolutional code (STCC. Under this structure, we prove three properties related to the generator matrix of the convolutional code that can be used to simplify the code search procedure for STCCs over . Some STCCs of large diversity order (≥4 designed under the trace criterion for , and 4 transmit antennas are presented for various PSK signal constellations.

  5. Donor impurity states and related optical response in a lateral coupled dot-ring system under applied electric field

    Energy Technology Data Exchange (ETDEWEB)

    Correa, J.D. [Departamento de Ciencias Básicas, Universidad de Medellín, Medellín (Colombia); Mora-Ramos, M.E. [Centro de Investigación en Ciencias, Instituto de Ciencias Básicas y Aplicadas, Universidad Autonoma del Estado de Morelos, Av. Universidad 1001, CP 62209 Cuernavaca, Morelos (Mexico); Duque, C.A., E-mail: cduque@fisica.udea.edu.co [Grupo de Materia Condensada-UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín (Colombia)

    2015-09-01

    A study on the effects of an externally applied electric field on the linear optical absorption and relative refractive index change associated with transitions between off-center donor impurity states in laterally coupled quantum dot-ring system is reported. Electron states are calculated within the effective mass and parabolic band approximations by means of an exact diagonalization procedure. The states and the optical response in each case show significant sensitivity to the geometrical distribution of confining energies as well as to the strength of the applied field.

  6. Donor impurity states and related optical response in a lateral coupled dot-ring system under applied electric field

    International Nuclear Information System (INIS)

    A study on the effects of an externally applied electric field on the linear optical absorption and relative refractive index change associated with transitions between off-center donor impurity states in laterally coupled quantum dot-ring system is reported. Electron states are calculated within the effective mass and parabolic band approximations by means of an exact diagonalization procedure. The states and the optical response in each case show significant sensitivity to the geometrical distribution of confining energies as well as to the strength of the applied field

  7. Development of a Turn-by-Turn Beam Position Monitoring System for Multiple Bunch Operation of the ATF Damping Ring

    CERN Document Server

    Burrows, P N; Kraljevic, N Blaskovic; Christian, G B; Davis, M R; Perry, C; Apsimon, R J; Constance, B; Gerbershagen, A; Resta-Lopez, J

    2012-01-01

    An FPGA-based monitoring system has been developed to study multi-bunch beam instabilities in the damping ring (DR) of the KEK Accelerator Test Facility (ATF). The system utilises a stripline beam position monitor (BPM) and single-stage down-mixing BPM processor. The system is designed to record the horizontal and/or vertical positions of up to three bunches in the DR with c. 150ns bunch spacing, or the head bunch of up to three trains in a multi-bunch mode with a bunch spacing of 5.6 ns. The FPGA firmware and data acquisition software allow the recording of turnby-turn data. An overview of the system and performance results will be presented.

  8. The HERA-B ring imaging Cherenkov system - design and performance

    International Nuclear Information System (INIS)

    The Ring Imaging Cherenkov detector of the HERA-B experiment at DESY has been completed in January of 1999. Data in its final configuration were taken recently. The HERA-B RICH uses C4F10 as radiator gas and a large 24 m2 spherical mirror for imaging. The photon detector employs 2240 Hamamatsu multi-anode photomultipliers with a total of 27 000 channels. To match anode dimension (4.5 mm) and dispersion error and to solve the PMT packing problem we used a 2 : 1 reducing two-lens telescope in front of each PMT. The design performance of the RICH was fully reached: the average number of photons for a β=1 particle detected in the RICH was found to be 35.4; a single-photon resolution of 0.65 mrad was reached. We used stand-alone ring finding algorithms to measure the angle and β of tracks. With the position information of the target and that of clusters in the electromagnetic calorimeter we were able to identify electrons, pions, kaons and protons

  9. Home-grown creativity; Northern BC inventor makes a name

    International Nuclear Information System (INIS)

    The GRAMUS pump is a gas-recovery and minimal usage mechanism designed to recover waste gases, thereby reducing emission to the atmosphere. The pump, invented by Dan Vezina in Fort St. John, requires no oil to lubricate it, is virtually maintenance-free and low enough in price to rapidly recover its cost when used to replace old style diaphragm pumps which are widely use in the petroleum industry for venting gas to the atmosphere. The GRAMUS pump recovers the drive gas, and rather than venting it into the atmosphere it injects it back into the system through its double-acting cylinder which pumps without the need for oil around its switching mechanism. The prototype was tested by Talisman Energy at their Inga Lake location, and found that the GRAMUS recovery system saved them $840 per month in propane costs (the gas that is commonly used to power the old style diaphragm pumps). The pumps are now manufactured and distributed commercially by Crown West Steel Fabricators in Kelowna, BC (in partnership with Vezina). They are doing brisk business with virtually every company in BC and Alberta whose operations formerly used the old diaphragm pumps

  10. ''Ring monitoring system'' - a new concept for gamma dose rate monitoring shown on the example of the nuclear power plant Pilgrim Station

    International Nuclear Information System (INIS)

    The 'Ring Monitoring System' represents a measurement and alerting system for the supervision of gamma dose rate in the vicinity of a nuclear power plant. This system especially meets the customer demand for direct and continuous access upon the monitoring stations from different central computer systems. (orig.)

  11. The Enceladus Ring

    Science.gov (United States)

    2006-01-01

    [figure removed for brevity, see original site] The Enceladus Ring (labeled) This excellent view of the faint E ring -- a ring feature now known to be created by Enceladus -- also shows two of Saturn's small moons that orbit within the ring, among a field of stars in the background. The E ring extends from three to eight Saturn radii -- about 180,000 kilometers (118,000 miles) to 482,000 kilometers (300,000 miles). Its full extent is not visible in this view. Calypso (22 kilometers, or 14 miles across) and Helene (32 kilometers, or 20 miles across) orbit within the E ring's expanse. Helene skirts the outer parts of the E ring, but here it is projected in front of a region deeper within the ring. Calypso and Helene are trojan satellites, or moons that orbit 60 degrees in front or behind a larger moon. Calypso is a Tethys trojan and Helene is a trojan of Dione. An interesting feature of note in this image is the double-banded appearance of the E-ring, which is created because the ring is somewhat fainter in the ringplane than it is 500-1,000 kilometers (300-600 miles) above and below the ringplane. This appearance implies that the particles in this part of the ring have nonzero inclinations (a similar affect is seen in Jupiter's gossamer ring). An object with a nonzero inclination does not orbit exactly at Saturn's ringplane. Instead, its orbit takes it above and below the ringplane. Scientists are not entirely sure why the particles should have such inclinations, but they are fairly certain that the reason involves Enceladus. One possible explanation is that all the E ring particles come from the plume of icy material that is shooting due south out of the moon's pole. This means all of the particles are created with a certain velocity out of the ringplane, and then they orbit above and below that plane. Another possible explanation is that Enceladus produces particles with a range of speeds, but the moon gravitationally scatters any particles that lie very close to

  12. Flux and budget of BC in the continental shelf seas adjacent to Chinese high BC emission source regions

    Science.gov (United States)

    Fang, Yin; Chen, Yingjun; Tian, Chongguo; Lin, Tian; Hu, Limin; Huang, Guopei; Tang, Jianhui; Li, Jun; Zhang, Gan

    2015-07-01

    This study conducted the first comprehensive investigation of sedimentary black carbon (BC) concentration, flux, and budget in the continental shelves of "Bohai Sea (BS) and Yellow Sea (YS)," based on measurements of BC in 191 surface sediments, 36 riverine water, and 2 seawater samples, as well as the reported data set of the atmospheric samples from seven coastal cities in the Bohai Rim. BC concentrations in these matrices were measured using the method of thermal/optical reflectance. The spatial distribution of the BC concentration in surface sediments was largely influenced by the regional hydrodynamic conditions, with high values mainly occurring in the central mud areas where fine-grained particles (median diameters > 6 Φ (i.e., area-integrated sedimentary BC sink flux in the entire BS and YS was ~325 Gg/yr, and the BS alone contributed ~50% (~157 Gg/yr). The BC budget calculated in the BS showed that atmospheric deposition, riverine discharge, and import from the Northern Yellow Sea (NYS) each contributed ~51%, ~47%, and ~2%. Therefore, atmospheric deposition and riverine discharge dominated the total BC influx (~98%). Sequestration to bottom sediments was the major BC output pattern, accounting for ~88% of the input BC. Water exchange between the BS and the NYS was also an important BC transport route, with net BC transport from the BS to the NYS.

  13. BC Hydro's integrated resource planning : the 2004 IEP and beyond

    International Nuclear Information System (INIS)

    An outline of BC Hydro Integrated Electricity Plan (IEP) was presented in this paper, along with details of its environmental, social and business performance and statistics of its net income and revenue for 2003-2004. The IEP was created to match long term load to supply in the most cost-effective way and is also the basis for resource acquisition plans. In addition, the IEP models performance of portfolios of resources on a system-wide basis, considers uncertainties through sensitivity analysis and measures and evaluates multiple attributes from various portfolios. A flow chart of processes informed by the IEP was presented. Guiding principles behind the creation of the plan include low electricity rates and public ownership; secure, reliable supply; private sector development; environmental responsibility, with no nuclear power sources; ensuring energy self-sufficiency; and maintaining a balanced portfolio of resources. A pie chart of BC Hydro's current portfolio mix was presented as well as a supply and demand outlook and details of plans and new capacity resources required before 2013. Various resource options were presented. Key outcomes of First Nations and stakeholder engagement include the acceptance of BC Hydro as a sustainable energy company; a desire for higher priority on reliability and low cost; an agreement over the Power Smart 10 year plan; a general agreement that the current, balanced approach to resource acquisition was appropriate; and a desire for more rate options. There was an assurance that BC Hydro would continue to engage First Nations and stakeholders in integrated electricity planning. Other outcomes included requests for more information about outage and outage planning and process improvements; support to maintain low rates; a preference for maximizing use of existing facilities; support for wood waste cogeneration. A broad range of options were reviewed, but no superior portfolio was identified within the parameters of this paper

  14. Gravitomagnetic Field of Rotating Rings

    CERN Document Server

    Ruggiero, Matteo Luca

    2015-01-01

    In the framework of the so-called gravitoelectromagnetic formalism, according to which the equations of the gravitational field can be written in analogy with the classical electromagnetism, we study the gravitomagnetic field of a rotating ring, orbiting around a central body. We calculate the gravitomagnetic component of the the ring field, both in the intermediate zone between the ring and the central body, and far away from the ring and central body. We evaluate the impact of the gravitomagnetic field on the motion of test particles and, as an application, we use these results, together with the Solar System ephemeris, to infer information on the spin of ring-like structures.

  15. Analysis of Longitudinal Beam Dynamics Behavior and RF System Operative Limits at High Beam Currents in Storage Rings

    Energy Technology Data Exchange (ETDEWEB)

    Mastorides, T; Rivetta, C.; Fox, J.D.; Winkle, D.Van; /SLAC; Tytelman, D.; /Dimtel, Redwood City

    2008-07-07

    A dynamics simulation model is used to estimate limits of performance of the Positron-Electron Project (PEP-II). The simulation captures the dynamics and technical limitations of the Low Level Radio Frequency (LLRF) system, the high-power RF components and the low-order mode coupled bunch longitudinal beam dynamics. Simulation results showing the effect of non-linearities on the LLRF loops, and studies of the effectiveness of technical component upgrades are reported, as well as a comparison of these results with PEP-II measurements. These studies have led to the estimation of limits and determining factors in the maximum stored current that the Low Energy Ring/High Energy Ring (LER/HER) can achieve, based on system stability for different RF station configurations and upgrades. In particular, the feasibility of the PEP-II plans to achieve the final goal in luminosity, which required an increase of the beam currents to 4A for LER and 2.2A for HER, is studied. These currents are challenging in part because they would push the longitudinal low-order beam mode stability to the limit, and the klystron forward power past a level of satisfactory margin. An acceptable margin is defined in this paper, which in turn determines the corresponding klystron forward power limitation.

  16. A ring test of a wireless in vitro gas production system

    DEFF Research Database (Denmark)

    Cornou, Cecile; Storm, Ida Marie Lindhardt Drejer; Hindrichsen, Ida Katarina Auf der M.;

    2013-01-01

    The in vitro gas production (GP) technique has been widely used for feed evaluation. However, variability in results limits useful comparisons. Results from a ring test undertaken in four laboratories (Italy - IT, Spain - SP, Wales - WA and Denmark - DK) using the same wireless equipment (ANKOM...... Technology), same substrates and same laboratory protocol are presented, including calculation of repeatability and reproducibility according to ISO 5725-2. Hay, maize starch and straw samples and units without sample (blanks) were incubated in five repetitions using rumen inoculum from cows (DK, IT and WA...... produced (h); (iv) GPMR: maximum predicted GP rate (mL/h); (v) L: lag time (h). A mixed model including laboratories as random effect was used. A significant interaction between substrate and laboratories was found for all variables except A. The most repeatable and reproducible results were observed for A...

  17. UHV seal studies for the advanced photon source storage ring vacuum system

    International Nuclear Information System (INIS)

    The Advanced Photon Source (APS) Storage Ring Vacuum Chambers (SRVC) are constructed of aluminum. The chamber design incorporates aluminum alloy 2219-T87 Conflat flanges welded to an aluminum alloy 6063-T5 extruded chamber body. Vacuum connections to the aluminum Conflat chamber flanges are by means of 304 stainless steel Conflat flanges. To evaluate the Conflat seal assemblies relative to vacuum bake cycles, a Conflat Bake Test Assembly (CBTA) was constructed, and thermal cycling tests were performed between room temperature and 150 degrees C on both stainless steel to aluminum Conflat assemblies and aluminum to aluminum Conflat assemblies. A Helicoflex Bake Test Assembly (HBTA) was similarly constructed to evaluate Helicoflex seals. Both Conflat and Helicoflex seals were studied in a SRVC Sector String Test arrangement of five SRVC sections. The CBTA, HBTA and SRVC tests and their results are reported. 3 refs., 2 figs., 2 tabs

  18. UHV seal studies for the Advanced Photon Source storage ring vacuum system

    International Nuclear Information System (INIS)

    The Advanced Photon Source (APS) Storage Ring Vacuum Chambers (SRVC) are constructed of aluminum. The chamber design incorporates aluminum alloy 2219-T87 Conflat flanges welded to an aluminum alloy 60603-T5 extruded chamber body. Vacuum connections to the aluminum Conflat chamber flanges are by means of 304 stainless steel Conflat flanges. To evaluate the Conflat seal assemblies relative to vacuum bake cycles, a Conflat Bake Test Assembly (CBTA) was constructed, and thermal cycling tests were performed between room temperature and 150 C on both stainless steel to aluminum Conflat assemblies and aluminum to aluminum Conflat assemblies. A Helicoflex Bake Test Assembly (HBTA) was similarly constructed to evaluate Helicoflex seals. Both Conflat and Helicoflex seals were studied in a SRVC Sector String Test arrangement of five SRVC sections. The CBTA, HBTA and SRVC tests and their results are reported

  19. Space-Time Convolutional Codes over Finite Fields and Rings for Systems with Large Diversity Order

    Directory of Open Access Journals (Sweden)

    B. F. Uchôa-Filho

    2008-06-01

    Full Text Available We propose a convolutional encoder over the finite ring of integers modulo pk,ℤpk, where p is a prime number and k is any positive integer, to generate a space-time convolutional code (STCC. Under this structure, we prove three properties related to the generator matrix of the convolutional code that can be used to simplify the code search procedure for STCCs over ℤpk. Some STCCs of large diversity order (≥4 designed under the trace criterion for n=2,3, and 4 transmit antennas are presented for various PSK signal constellations.

  20. Topological rings

    CERN Document Server

    Warner, S

    1993-01-01

    This text brings the reader to the frontiers of current research in topological rings. The exercises illustrate many results and theorems while a comprehensive bibliography is also included. The book is aimed at those readers acquainted with some very basic point-set topology and algebra, as normally presented in semester courses at the beginning graduate level or even at the advanced undergraduate level. Familiarity with Hausdorff, metric, compact and locally compact spaces and basic properties of continuous functions, also with groups, rings, fields, vector spaces and modules, and with Zorn''s Lemma, is also expected.

  1. The orbits of the uranian satellites and rings, the gravity field of the uranian system, and the orientation of the pole of Uranus

    Energy Technology Data Exchange (ETDEWEB)

    Jacobson, R. A., E-mail: robert.jacobson@jpl.nasa.gov [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099 (United States)

    2014-11-01

    French et al. determined the orbits of the Uranian rings, the orientation of the pole of Uranus, and the gravity harmonics of Uranus from Earth-based and Voyager ring occultations. Jacobson et al. determined the orbits of the Uranian satellites and the masses of Uranus and its satellites from Earth-based astrometry and observations acquired with the Voyager 2 spacecraft; they used the gravity harmonics and pole from French et al. Jacobson and Rush reconstructed the Voyager 2 trajectory and redetermined the Uranian system gravity parameters, satellite orbits, and ring orbits in a combined analysis of the data used previously augmented with additional Earth-based astrometry. Here we report on an extension of that work that incorporates additional astrometry and ring occultations together with improved data processing techniques.

  2. BC Hydro`s transmission business : transition to a competitive marketplace

    Energy Technology Data Exchange (ETDEWEB)

    Threlkeld, R.J. [British Columbia Hydro, Vancouver, BC (Canada)

    1998-07-01

    Progress made by BC Hydro to facilitate the use of the transmission system for wholesale electricity transactions, including the separation of the system operation function from generation and merchant functions, was discussed. BC Hydro, Canada`s third largest electric utility, was the first Canadian utility to offer open access to its transmission system for wholesale transactions. The utility has an installed generating capacity of about 10.8 gigawatts, 90 per cent of which is hydroelectric. The remainder is thermal, gas turbine and stationary and mobile diesel generation. The key element in establishing wholesale transmission transactions was the FERC-mandated open access same-time information system (OASIS) on which BC Hydro posts available transmission capacity, planned outages and pricing. The system operates on BC Hydro`s internet node and interfaces to a Transmission Scheduling System (TSS). The TSS was developed in-house to handle the increased complexity of scheduling multiple energy and capacity transactions for users of the transmission system. Operation of the system and the challenge to constantly improve it were discussed.

  3. Experimental investigation of thermal processes in the multi-ring Couette system with counter rotation of cylinders

    Science.gov (United States)

    Mamonov, V. N.; Nazarov, A. D.; Serov, A. F.; Terekhov, V. I.

    2016-01-01

    The effect of parameters of the multi-ring Couette system with counter rotating coaxial cylinders on the process of thermal energy release in a viscous liquid filling this system is considered with regard to the problem of determining the possibility of creating the high-performance wind heat generator. The multi-cylinder rotor design allows directly conversion of the mechanical power of a device consisting of two "rotor" wind turbines with a common axis normal to the air flow into the thermal energy in a wide range of rotational speed of the cylinders. Experimental results on the measurement of thermal power released in the pilot heat generator at different relative angular speeds of cylinder rotation are presented.

  4. Simulations of a dual TOF detector system for isochronous mass spectrometry in the collector ring at FAIR

    International Nuclear Information System (INIS)

    Direct mass measurements of short-lived exotic nuclei yield key information for modern nuclear physics. Experimentally determined mass values of exotic nuclei have a big impact on numerous applications in fundamental and applied science. With the Superconducting-Fragment Separator (Super-FRS) at the new FAIR facility a whole new range of exotic nuclei far away from stability will be accessible. Higher beam intensities and larger phase space volumes impose new challenges for the detection systems. To measure masses of short-lived exotic nuclei one can use the Isochronous Mass Spectrometry (IMS) which presently is successfully performed at the FRS-ESR facility. For IMS in the future Collector Ring, (CR) a first version of a new dual Time-Of-Flight (TOF) detector system, which fulfills the requirements of the new beam parameters has been designed. Simulation results for the new TOF detector in the CR will be shown.

  5. Search for the Bc(2S) meson at CMS

    CERN Document Server

    Alves, Bruno

    2016-01-01

    The work was developed during the CERN Summer Student Programme, from June 27th to September 14th. We looked for the excited state of the Bc meson that has already been found in the ATLAS experiment. Optimized cuts were obtained both for the Bc and for the Bc(2S) mesons. The final results are not conclusive, but indicate the presence of a signal. Run 2 data set (2015-2016) is required.

  6. Compact and broadband circularly polarized ring antenna with wide beam-width for multiple global navigation satellite systems

    International Nuclear Information System (INIS)

    A compact and broadband circularly polarized (CP) annular ring antenna with wide beam-width is proposed for multiple global navigation satellite systems (GNSS) in the L1 band. The annular ring is excited by two modified L-probes with quadrature phase difference. It has a 36.3% 10-dB return loss bandwidth and a 13% 3-dB axial ratio bandwidth, because of the orthogonal L-probes with 90° phase difference. The measured peak gain of the antenna is 3.9 dBic. It can detect the satellites at lower elevation as its half power beam-width (HPBW) is 113° in both the x—z and y—z planes, achieving a cross-polarization level of larger than 25 dB. Noticeably, the antenna achieves 89% size reduction compared with the conventional half wavelength patch antennas. It can be used in hand-held navigation devices of multiple GNSS such as COMPASS, Galileo, GPS and GLONASS. (condensed matter: electronic structure, electrical, magnetic, and optical properties)

  7. Compact stellar systems in the polar ring galaxies NGC 4650A and NGC 3808B: Clues to polar disk formation

    CERN Document Server

    Ordenes-Briceño, Yasna; Puzia, Thomas H; Goudfrooij, Paul; Arnaboldi, Magda

    2016-01-01

    Polar ring galaxies (PRGs) are composed of two kinematically distinct and nearly orthogonal components, a host galaxy (HG) and a polar ring/disk (PR). The HG usually contains an older stellar population than the PR. The suggested formation channel of PRGs is still poorly constrained. Suggested options are merger, gas accretion, tidal interaction, or a combination of both. To constrain the formation scenario of PRGs, we study the compact stellar systems (CSSs) in two PRGs at different evolutionary stages: NGC 4650A with well-defined PR, and NGC 3808B, which is in the process of PR formation. We use archival HST/WFPC2 imaging. PSF-fitting techniques, and color selection criteria are used to select cluster candidates. Photometric analysis of the CSSs was performed to determine their ages and masses using stellar population models at a fixed metallicity. Both PRGs contain young CSSs ($< 1$ Gyr) with masses of up to 5$\\times$10$^6$M$_\\odot$, mostly located in the PR and along the tidal debris. The most massive ...

  8. Compact and broadband circularly polarized ring antenna with wide beam-width for multiple global navigation satellite systems

    Institute of Scientific and Technical Information of China (English)

    Zhang Hong-Lin; Hu Bin-Jie; Zhang Xiu-Yin

    2012-01-01

    A compact and broadband circularly polarized (CP) annular ring antenna with wide beam-width is proposed for multiple global navigation satellite systems (GNSS) in the L1 band.The annular ring is excited by two modified L-probes with quadrature phase difference.It has a 36.3% 10-dB return loss bandwidth and a 13% 3-dB axial ratio bandwidth,because of the orthogonal L-probes with 90° phase difference.The measured peak gain of the antenna is 3.9 dBic.It can detect the satellites at lower elevation as its half power beam-width (HPBW) is 113° in both the x-z and y-z planes,achieving a cross-polarization level of larger than 25 dB.Noticeably,the antenna achieves 89% size reduction compared with the conventional half wavelength patch antennas.It can be used in hand-held navigation devices of multiple GNSS such as COMPASS,Galileo,GPS and GLONASS.

  9. Tree rings and radiocarbon calibration

    International Nuclear Information System (INIS)

    Only a few kinds of trees in Australia and Southeast Asia are known to have growth rings that are both distinct and annual. Those that do are therefore extremely important to climatic and isotope studies. In western Tasmania, extensive work with Huon pine (Lagarostrobos franklinii) has shown that many living trees are more than 1,000 years old, and that their ring widths are sensitive to temperature, rainfall and cloud cover (Buckley et al. 1997). At the Stanley River there is a forest of living (and recently felled) trees which we have sampled and measured. There are also thousands of subfossil Huon pine logs, buried at depths less than 5 metres in an area of floodplain extending over a distance of more than a kilometre with a width of tens of metres. Some of these logs have been buried for 50,000 years or more, but most of them belong to the period between 15,000 years and the present. In previous expeditions in the 1980s and 1990s, we excavated and sampled about 350 logs (Barbetti et al. 1995; Nanson et al. 1995). By measuring the ring-width patterns, and matching them between logs and living trees, we have constructed a tree-ring dated chronology from 571 BC to AD 1992. We have also built a 4254-ring floating chronology (placed by radiocarbon at ca. 3580 to 7830 years ago), and an earlier 1268-ring chronology (ca. 7,580 to 8,850 years ago). There are many individuals, or pairs of logs which match and together span several centuries, at 9,000 years ago and beyond

  10. Prospects of Bc Mesons at the Compact Muon Solenoid

    Institute of Scientific and Technical Information of China (English)

    ZHANG Shao-He; A. A. Belkov; S. Shulga; CHEN Guo-Ming

    2004-01-01

    @@ The results of two Monte Carlo generators for production of Bc mesons in pp collisions are compared at the large hadron collider energy √s = 14 TeV. In the study, the produced Bc mesons were forced to decay into the final states Bslv, Bsπ, J/ψlv, and J/ψπ. We have estimated that about 104 decays of Bc are expected to be recorded during the first year of the CMS running with a lepton trigger. Many Bc studies can be carried out by using these events with a statistical error at the level of 10-2.

  11. Ring interferometry

    CERN Document Server

    Malykin, Grigorii B; Zhurov, Alexei

    2013-01-01

    This monograph is devoted to the creation of a comprehensive formalism for quantitative description of polarized modes' linear interaction in modern single-mode optic fibers. The theory of random connections between polarized modes, developed in the monograph, allows calculations of the zero shift deviations for a fiber ring interferometer. The monograph addresses also the

  12. Cox Rings

    CERN Document Server

    Arzhantsev, Ivan; Hausen, Juergen; Laface, Antonio

    2010-01-01

    This is the first chapter of an introductory text under construction. Our aim is to provide an elementary access to Cox rings and their applications in algebraic and arithmetic geometry. Any comments and suggestions on this draft will be highly appreciated.

  13. Three-Dimensional BC/PEDOT Composite Nanofibers with High Performance for Electrode-Cell Interface.

    Science.gov (United States)

    Chen, Chuntao; Zhang, Ting; Zhang, Qi; Feng, Zhangqi; Zhu, Chunlin; Yu, Yalin; Li, Kangming; Zhao, Mengyao; Yang, Jiazhi; Liu, Jian; Sun, Dongping

    2015-12-30

    There is an increasing need to synthesize biocompatible nanofibers with excellent mechanical and electrical performance for electrochemical and biomedical applications. Here we report a facile approach to prepare electroactive and flexible 3D nanostructured biomaterials with high performance based on bacterial cellulose (BC) nanofibers. Our approach can coat BC nanofibers with poly(3,4-ethylenedioxythiophene) (PEDOT) by in situ interfacial polymerization in a controllable manner. The PEDOT coating thickness is adjustable by the monomer concentration or reaction time during polymerization, producing nanofibers with a total diameter ranging from 30 to 200 nm. This fabrication process also provides a convenient method to tune different parameters such as the average pore size and electrical conductivity on the demands of actual applications. Our experiments have demonstrated that the 3D BC/PEDOT nanofibers exhibit high specific surface area, excellent mechanical properties, electroactive stability, and low cell cytotoxicity. With electrical stimulation, calcium imaging of PC12 neural cells on BC/PEDOT nanofibers has revealed a significant increase in the percentage of cells with higher action potentials, suggesting an enhanced capacitance effect of charge injection. As an attractive solution to the challenge of designing better electrode-cell interfaces, 3D BC/PEDOT nanofibers promise many important applications such as biosensing devices, smart drug delivery systems, and implantable electrodes for tissue engineering. PMID:26550840

  14. Rectangular Ring Antenna Excited by Circular Disc Monopole for WiMAX System

    Directory of Open Access Journals (Sweden)

    Souphanna Vongsack

    2014-01-01

    Full Text Available This research presents a rectangular ring antenna excited by a circular disc monopole (CDM mounted in front of a square reflector. The proposed antenna is designed to cover a frequency range of 2.300–5.825 GHz and thereby is suitable for WiMAX applications. Multiple parametric studies were carried out using the CST Microwave Studio simulation program. A prototype antenna was fabricated and experimented. The measurements were taken and compared with the simulation results, which indicates good agreement between both results. The prototype antenna produces an impedance bandwidth (|S11| < −10 dB that covers the WiMAX frequency range and a constant unidirectional radiation pattern (θ=0° and ∅=90°. The minimum and maximum gains are 3.7 and 8.7 dBi, respectively. The proposed antenna is of compact size and has good unidirectional radiation performance. Thus, it is very suitable for a multitude of WiMAX applications.

  15. The Leo Archipelago: A System of Earth-Rings for Communications, Mass-Transport to Space, Solar Power, and Control of Global Warming

    CERN Document Server

    Meulenberg, Andrew

    2010-01-01

    A multi-purpose low-earth-orbit system of rings circling the earth - the "LEO ARCHIPELAGO" - is proposed as a means of solving or bypassing many major problems hindering man's quest to get into space. A fiber-optic ring about the earth would be an initial testing and developmental stage for the ring systems, while providing cash-flow through a LEO-based, high-band-width, world-wide communication system. A Low-Earth-Orbit-based space-elevator system, "Sling-on-a-Ring," is proposed as the crucial developmental stage of the LEO Archipelago. Being a LEO-based heavy-mass lifter, rather than earth- or GEO-based, it is much less massive and therefore less costly than other proposed space-elevators. With the advent of lower-cost, higher-mass transport to orbit, the options for further space development (e.g., communications, space solar power, radiation dampers, sun shades, and permanent LEO habitation) are greatly expanded. This paper provides an update of the Sling-on-a-Ring concept in terms of new materials, poten...

  16. Variation of ground state Bc and B*c meson masses for various n values

    International Nuclear Information System (INIS)

    One of the most challenging field in theoretical particle physics is heavy quark physics. The huge amount of data available on hadrons needs to be explained in order to explore this field. Experimentally if one finds the need of high energy particles that can probe quark level physics, theoretically a suitable model is required to explain the properties such as mass spectrum, decays, reaction mechanism and bound state behaviours of those mesons which involve these quarks. In this line Bc meson is of significance when compared to flavour symmetric cc¯ and bb¯ meson states because it is the only meson composed of a b-quark and c¯ quark and is the first particle containing both b and c quarks. The Bc is the lowest mass bound state of c and b quarks which is expected to be a pseudo scalar meson predicted by the Standard Model

  17. BC Hydro's business plan: a summary of BC Hydro's strategic business plan and performance measures

    International Nuclear Information System (INIS)

    This document contains a summary of BC Hydro's Strategic Plan and performance measures. The plan has been prepared in response to the recommendations of the Budget Process Review Panel, convened by the BC Government, which recommended that each public body, crown corporation, and other agencies of government, prepare an annual three year business plan. The document reviews the utility's current situation, provides an outline of the company's vision of its role, its mission and values, its strategic objectives (effective governance, efficiency and productivity; service excellence and value-added solutions; market development ; strong and capable organization) and the tools to be utilized in measuring performance. Various strategic issues (financial resources, the need to protect and enhance the value of electricity trading; the impact of information technology; power technology development; environmental trends and 'green energy' initiatives; workforce training and development) are also highlighted

  18. Water use planning in BC as a form of re-licensing

    International Nuclear Information System (INIS)

    The need to improve the process by which public input is incorporated into water-use planning in British Columbia is discussed. BC Hydro produces 80 per cent of the energy in the province, 95 per cent of which is hydro generated. The operation of the hydro-electric facilities inevitably impacts other watershed resources. BC Hydro holds 88 water licenses on 27 rivers for storage, diversion and generation. Many of the licenses were granted before 1962, all of which carry conditional clauses. Only four contain sunset clauses. In response to public pressure after recent flood events, BC Hydro has worked to develop a Water Use Planning process for voluntarily carrying out a public review of all licenses. The process allows fisheries agencies to examine the costs and benefits of changing system operations and to make informed decisions on the balance between power and non-power values

  19. Remedial action and waste disposal project: 100-B/C remedial action readiness report

    International Nuclear Information System (INIS)

    This Readiness Evaluation Report presents the results of the project readiness evaluation to assess the readiness of the 100-B/C source sites remediation. The 100-B/C Area is located at the Hanford Site in Richland, Washington. The evaluation was conducted at the conclusion of a series of readiness activities that began in May 1996. These activities included confirming the completion of project specific procedures, training of staff, obtaining support equipment, receipt of subcontractor submittals, approval of subcontractor submittals, and mobilization and construction of site support systems

  20. Decay ring design

    CERN Document Server

    Chancé, A; Bouquerel, E; Hancock, S; Jensen, E

    The study of the neutrino oscillation between its different flavours needs pureand very intense fluxes of high energy, well collimated neutrinos with a welldetermined energy spectrum. A dedicated machine seems to be necessarynowadays to reach the required flux. A new concept based on the β-decayof radioactive ions which were accelerated in an accelerator chain was thenproposed. After ion production, stripping, bunching and acceleration, the unstableions are then stored in a racetrack-shaped superconducting decay ring.Finally, the ions are accumulated in the decay ring until being lost. The incomingbeam is merged to the stored beam by using a specific RF system, whichwill be presented here.We propose here to study some aspects of the decay ring, such as its opticalproperties, its RF system or the management of the losses which occur in thering (mainly by decay or by collimation).

  1. Construction of the beam profile monitor system with CameraLink in the SPring-8 booster ring and beam transport line

    International Nuclear Information System (INIS)

    We had measured the beam position and size in the SPring-8 booster ring and beam transport line by the monitor system that consists of analog video camera and fluorescent plate. It was difficult to estimate the seasonal change of the beam position and beam size between user operation cycles. In order to keep the high injection efficiency to SPring-8 storage ring, we need to achieve the tuning reproducibility of the accelerator parameter in the booster ring and beam transport line by using the quantitative data. The newly constructed beam profile monitor system consists of the digital CCD camera with external trigger synchronous capturing function, camera selectors, and server computers. Each camera system placed on the booster ring and beam transport line are managed by the UNIX server computer setup for each area. This system is connected by the cameralink configuration devices with cameralink cables or optical fiber cables. It became possible to capture image of beam profile synchronous with a beam trigger with a high resolution and a fast capturing time as same as it by using the analog video system. We will report the detail of beam profile monitor system with cameralink and the system operation. (author)

  2. Identification of BC005512 as a DNA damage responsive murine endogenous retrovirus of GLN family involved in cell growth regulation.

    Directory of Open Access Journals (Sweden)

    Yuanfeng Wu

    Full Text Available Genotoxicity assessment is of great significance in drug safety evaluation, and microarray is a useful tool widely used to identify genotoxic stress responsive genes. In the present work, by using oligonucleotide microarray in an in vivo model, we identified an unknown gene BC005512 (abbreviated as BC, official full name: cDNA sequence BC005512, whose expression in mouse liver was specifically induced by seven well-known genotoxins (GTXs, but not by non-genotoxins (NGTXs. Bioinformatics revealed that BC was a member of the GLN family of murine endogenous retrovirus (ERV. However, the relationship to genotoxicity and the cellular function of GLN are largely unknown. Using NIH/3T3 cells as an in vitro model system and quantitative real-time PCR, BC expression was specifically induced by another seven GTXs, covering diverse genotoxicity mechanisms. Additionally, dose-response and linear regression analysis showed that expression level of BC in NIH/3T3 cells strongly correlated with DNA damage, measured using the alkaline comet assay,. While in p53 deficient L5178Y cells, GTXs could not induce BC expression. Further functional studies using RNA interference revealed that down-regulation of BC expression induced G1/S phase arrest, inhibited cell proliferation and thus suppressed cell growth in NIH/3T3 cells. Together, our results provide the first evidence that BC005512, a member from GLN family of murine ERV, was responsive to DNA damage and involved in cell growth regulation. These findings could be of great value in genotoxicity predictions and contribute to a deeper understanding of GLN biological functions.

  3. Trustee Roundtable [2009 BC Library Conference Session Summary

    OpenAIRE

    Morrison, Errin

    2009-01-01

    The Trustee Roundtable is an annual gathering of public library trustees at the BC Library Conference. It is a chance to get together with BC Library Trustees Association board members and other trustees to talk about successes, concerns, challenges, and ideas.

  4. Structures of quinone binding sites in bc complexes: Functional implications

    International Nuclear Information System (INIS)

    Near-atomic resolution structures are becoming available for the respiratory chain enzyme known as ubiquinol:cytochrome c oxidoreductase or the cytochrome bc1 complex. Here we examine our current structure for the chicken bc1 complex to see what it can tell us about the mode of binding and mechanism of reaction of quinone at the two active sites

  5. TechBC Memory Project: Bob de Wit

    OpenAIRE

    Hendrigan, Holly

    2015-01-01

    Bob de Wit is the subject of this interview. He came to TechBC in 1998 as the Chief Operating Officer of the TechBC Corporation, an applied research commercialization subsidiary of the University. He is now the CEO of the Greater Vancouver Homebuilders Association.

  6. Mechanical and electronic properties of diamondlike BC5

    Institute of Scientific and Technical Information of China (English)

    Qing ZHANG; Shi-ming WANG; Yong-cheng LIANG

    2011-01-01

    The structural properties, mechanical behavior, and electronic structure of the newly developed diamondlike BC5 (d-BC5) was investigated using density functional theory (DFT) calculations. The results indicate that d-BC5 has great bulk modulus of 393 GPa, large shear modulus of 398 GPa, and high hardness of 62 Pa, and thus support the fact that d-BC5 is an ultra-incompressible and superhard material. Remarkably, the superhard d-BC5 exhibits metallic features. Furthermore, the trend that the mechanical behavior falls with the increase of boron content was revealed. The combination of huge stiffness, high hardness, and good metallicity makes series of diamondlike BCx (d-BCx) valid for wider applications in comparison with pure diamond.

  7. Reversible photoswitching of rotaxane character and interplay of thermodynamic stability and kinetic lability in a self-assembling ring-axle molecular system.

    Science.gov (United States)

    Baroncini, Massimo; Silvi, Serena; Venturi, Margherita; Credi, Alberto

    2010-10-11

    We have designed, synthesized, and investigated a self-assembling system that can be reversibly interconverted between thermodynamically stable (pseudorotaxane) and kinetically inert (rotaxane) forms by light irradiation. The system is composed of a dibenzo[24]crown-8 ring and an axle comprised of a dibenzylammonium recognition site and two azobenzene end groups. The isomeric form of the azobenzene units of the axle has a little influence on the stability constants of the respective pseudorotaxanes but greatly affects the threading-dethreading rate constants. In fact, equilibration of the ring and the axle in its EE isomeric form occurs within seconds in acetonitrile at room temperature, whereas the ZZ axle threads-dethreads the ring at least four orders of magnitude slower. Moreover, we show that a change in the stability of the complex, achieved by deprotonating the dibenzylammonium recognition site on the axle, affects its kinetic behavior. We compare the results of these experiments with those observed upon dethreading the (pseudo)rotaxane by using a competitive guest for the ring, an approach which does not inherently destabilize the ring-axle interaction. This study outlines a general strategy for the reversible photochemical control of motion kinetics in threaded and interlocked compounds and constitutes a starting point for the construction of multicomponent structures that can behave as photochemically driven nanomachines. PMID:20842670

  8. The Structure of Saturn's Rings

    Science.gov (United States)

    Colwell, J. E.; Nicholson, P. D.; Tiscareno, M. S.; Murray, C. D.; French, R. G.; Marouf, E. A.

    of accretion and disruption at the edges of Saturn's Roche zone. Clumps and strands form and are disrupted as they encounter each other and are perturbed by close encounters with nearby Prometheus. The menagerie of structures in the rings reveals a system that is dynamic and evolving on timescales ranging from days to tens or hundreds of millions of years. The architecture of the rings thus provides insight to the origin as well as the long and short-term evolution of the rings.

  9. Control of ring lasers by means of coupled cavities

    DEFF Research Database (Denmark)

    Buchhave, Preben; Abitan, Haim; Tidemand-Lichtenberg, Peter

    2000-01-01

    Variable phase coupling to an external ring is used to control a unidirectional ring laser. The observed behavior of the coupled rings is explained theoretically. We have found experimentally that by quickly changing the phase of the feedback from the external ring it is possible to Q-switch the...... ring laser. Also, at certain values of the phase of the feedback in the external ring, instabilities in the total system occur and oscillations arise in the ring laser....

  10. Centralized multiprocessor control system for the frascati storage rings DAΦNE

    International Nuclear Information System (INIS)

    We describe the status of the DANTE (DAΦne New Tools Environment) control system for the new DAΦNE Φ-factory under construction at the Frascati National Laboratories. The system is based on a centralized communication architecture for simplicity and reliability. A central processor unit coordinates all communications between the consoles and the lower level distributed processing power, and continuously updates a central memory that contains the whole machine status. We have developed a system of VME Fiber Optic interfaces allowing very fast point to point communication between distant processors. Macintosh II personal computers are used as consoles. The lower levels are all built using the VME standard. (author)

  11. Carbon-14 in tree rings

    International Nuclear Information System (INIS)

    In order to investigate how reliably the carbon 14 content of tree rings reflects that of atmospheric carbon dioxide, two types of determinations were carried out: (1) carbon 14 determinations in annual rings from the beginning of this century until 1974 and (2) carbon 14 determinations in synchronous wood from the North American bristlecone pine and from European oak trees, dendrochronologically dated to have grown in the third and fourth century B.C. The first series of measurements showed that bomb-produced radiocarbon was incorporated in wood at a time when it was converted from sapwood to heartwood, whenever radiocarbon from bomb testing was present in the atmosphere. The second series showed that wood more than 2000 years old and grown on two different continents at different altitudes had, within the limits of experimental error, the same radiocarbon content. This work and other experimental evidence, obtained in part by other laboratories, show that tree rings reflect the average radiocarbon content of global atmospheric carbon dioxide accurately within several parts per mil. In rare cases, deviations of up to 10 parts per thousand may be possible. This means that a typical single radiocarbon date for wood or charcoal possesses an intrinsic uncertainty (viz., an estimated ''one-sigma error'' in addition to all the other errors) of the order of +-50 years. This intrinsic uncertainty is independent of the absolute age of the sample. More accurate dates can, in principle, be obtained by the so-called method of ''wiggle matching.''

  12. The Saturnian rings

    International Nuclear Information System (INIS)

    The structure of the Saturnian rings is traditionally believed to be due to resonances caused by Mimas (and possibly other satellites). It is shown that both theoretical and observational evidence rule out this interpretation. The increased observational accuracy on one hand and the increased understanding of the cosmogonic processes on the other makes it possible to explain the structure of the ring system as a product of condensation from a partially corotating plasma. In certain respects the agreement between theory and observations is about 1%. (Auth.)

  13. A low-cost dielectric spectroscopic system using metamaterial open horn-ring resonator-inspired BSF and detection circuitry

    Science.gov (United States)

    Kumari, Ratnesh; Patel, Piyush N.

    2016-07-01

    The sensitivity in a lower microwave band dielectric spectroscopic system is relatively less compared to that of millimeter wave and terahertz system. This work reports modeling and development of an epsilon-negative metamaterial resonator-inspired microwave band-stop filter as a prototype device and its detection circuitry for the spectroscopic analysis of dielectric samples in S-band. The device structure consists of a diamond-shaped patch with a complementary open split horn-ring resonator, fabricated on a Neltech substrate of relative permittivity ( ɛ r = 3.2). The measured transmission coefficient at 2.2 GHz and simulated result at 2.24 GHz demonstrate an excellent accuracy in the device fabrication. A low-cost connector-type microwave signal detection system was assembled for the real-time transduction of device signal into an equivalent DC voltage. Further, a single channel cavity developed using polydimethylsiloxane was placed over the resonator gap for analyzing the perturbation effect of electric field intensity on the resonance and circuit output DC level for different dielectric samples under test. The performed calibrations show linearity up to 82.5 % in the device response.

  14. The fascinating construction of pyridine ring systems by transition metal-catalysed [2 + 2 + 2] cycloaddition reactions.

    Science.gov (United States)

    Heller, Barbara; Hapke, Marko

    2007-07-01

    Cycloaddition reactions compose one of the most important classes of reactions when it comes to the simultaneous formation of several bonds in one reaction step. The de novo construction of carbocyclic aromatic systems from acetylenes was also found as an excellent possibility for the assembly of heteroaromatic systems. The transition metal-catalysed [2 + 2 + 2] cycloaddition reaction constitutes a fascinating tool for the synthesis of pyridines from nitriles and the most recent developments demonstrate the ability to control the substitution pattern as well as the possibility of introducing chirality by the use of achiral substrates and a chiral catalyst under mild conditions. In this tutorial review we are focusing on the de novo construction of pyridine ring systems by the transition metal-catalysed [2 + 2 + 2] cycloaddition reaction. After surveying the mechanistic features and intermediates of the reaction depending on the different metal complexes used, we depict the preparation of achiral pyridine derivatives. The last section describes the advances in the synthesis of chiral pyridines and biaryls using the cyclotrimerization method. The various possibilities of introducing chirality by catalytic means are presented and illustrated by instructive examples. This review will be of interest for people active in: Organic Chemistry, Organometallic Chemistry, Transition Metal Chemistry, Stereoselective Synthesis, Heterocyclic Chemistry. PMID:17576476

  15. Recombination-dependent growth in exonuclease-depleted recBC sbcBC strains of Escherichia coli K-12.

    Science.gov (United States)

    Ryder, L; Sharples, G J; Lloyd, R G

    1996-07-01

    Analysis of the aroLM-sbcCD interval of the Escherichia coli K-12 chromosome revealed a new gene (rdgC) encoding a function required for growth in recombination-deficient recBC sbcBC strains. Deletion of rdgC does not reduce viability, conjugational recombination, or DNA repair in rec+, recA, recB, recF, or recJ mutants. However, it makes the growth of recBC sbcBC strains reliant on the RecA, RecF, and RuvC proteins and, to a large extent, on RuvAB. The recBC sbcBC delta rdgC ruvAB construct forms colonies, but cell viability is reduced to delta rdgC derivative carrying the temperature-sensitive recA200 allele grows at 32 degrees but not 42 degrees. Multicopy rdgC+ plasmids reduce the growth rate of recBC sbcBC strains, while multicopy sbcC+ plasmids that reactivate SbcCD nuclease cannot be maintained without RdgC protein. The data presented are interpreted to suggest that exonuclease-depleted recBC sbcBC strains have difficulty removing the displaced arm of a collapsed replication fork and that this problem is compounded in the absence of RdgC. Recombination then becomes necessary to repair the fork and allow chromosome duplication to be completed. The possibility that RdgC is an exonuclease is discussed. PMID:8807285

  16. An active interlock system for the NSLS x-ray ring insertion devices

    International Nuclear Information System (INIS)

    This paper describes the design and operation of an active interlock system which has been installed in the NSLS X-ray electron storage ing to protect the vacuum chamber from thermal damage by mis-steered high power photon beams from insertion devices (IDs). the system employs active beam position detectors to monitor beam motion in the ID straight sections and solid state logic circuitry to ''dump'' the stored beam in the event of a fault condition by interrupting the rf. To ensure a high degree of reliability, redundancy and continuous automatic checking has been incorporated into the design. Overall system integrity is checked periodically with beam at safe levels of beam current. 2 refs., 3 figs

  17. Ageing effects on ring ties used in spacer cable systems; Desempenho de aneis de fixacao usados na rede protegida de distribuicao de energia electrica sob inteperismo natural

    Energy Technology Data Exchange (ETDEWEB)

    Munaro, Marilda

    2005-07-01

    This paper presents the performance of ring ties used in space cable systems. The aging was monitored during 3 years under normal conditions of utilization in Cuiaba city in the central area of Brazil, i.e., hot temperatures alternated with rain. The materials were evaluated by mechanical and optical tests. It was observed that the sun radiation associated with mechanical stress contribute to degradation of the elastomers: SiR and EPR. The ring ties manufactured with silicone rubber showed better behavior than those prepared from EPR. (author)

  18. Experimental studies on the ring opening polymerization of p-dioxanone using an Al((OPr)-Pr-i)(3)-monosaccharide initiator system

    NARCIS (Netherlands)

    Sugih, Asaf Kleopas; Picchioni, Francesco; Heeres, Hero J.

    2009-01-01

    The ring opening polymerization (ROP) of p-dioxanone using a protected monosaccharide (1,2;3.4-di-O-isopropylidene-alpha-D-galactopyranose)/Al((OPr)-Pr-i)(3) initiator system to yield polydioxanone with a protected monosaccharide end-group is described. The products were synthesized at 60-100 degree

  19. High Black Carbon (BC) Concentrations along Indian National Highways

    Science.gov (United States)

    Kumar, S.; Singh, A. K.; Singh, R. P.

    2015-12-01

    Abstract:Black carbon (BC), the optically absorbing component of carbonaceous aerosol, has direct influence on radiation budget and global warming. Vehicular pollution is one of the main sources for poor air quality and also atmospheric pollution. The number of diesel vehicles has increased on the Indian National Highways during day and night; these vehicles are used for the transport of goods from one city to another city and also used for public transport. A smoke plume from the vehicles is a common feature on the highways. We have made measurements of BC mass concentrations along the Indian National Highways using a potable Aethalometer installed in a moving car. We have carried out measurements along Varanasi to Kanpur (NH-2), Varanasi to Durgapur (NH-2), Varanasi to Singrauli (SH-5A) and Varanasi to Ghazipur (NH-29). We have found high concentration of BC along highways, the average BC mass concentrations vary in the range 20 - 40 µg/m3 and found high BC mass concentrations up to 600 μg/m3. Along the highways high BC concentrations were characteristics of the presence of industrial area, power plants, brick kilns and slow or standing vehicles. The effect of increasing BC concentrations along the National Highways and its impact on the vegetation and human health will be presented. Key Words: Black Carbon; Aethalometer; mass concentration; Indian National Highways.

  20. Nonlinear analysis of ring oscillator circuits

    KAUST Repository

    Ge, Xiaoqing

    2010-06-01

    Using nonlinear systems techniques, we analyze the stability properties and synchronization conditions for ring oscillator circuits, which are essential building blocks in digital systems. By making use of its cyclic structure, we investigate local and global stability properties of an n-stage ring oscillator. We present a sufficient condition for global asymptotic stability of the origin and obtain necessity if the ring oscillator consists of identical inverter elements. We then give a synchronization condition for identical interconnected ring oscillators.

  1. Operations with the digital orbit feedback system in the NSLS x-ray ring

    International Nuclear Information System (INIS)

    The digital filtering and eigenvector decomposition-based orbit correction is performed by two dedicated HP 742/743 rt micros which communicate with Motorola CPU based orbit-measuring and orbit-correction systems. The correction algorithm in the DFbk was orthogonalized with respect of the analog global harmonic feedback. Operational results concerning improvements in the noise suppression at low frequencies and especially in the dc drift as well as in the orbit stability are shown. Efforts are underway to improve the resolution of the orbit measuing system and the sampling rate using 16 bit 400 kHz ADC's which will allow orbit sampling with high resolution at 4 kHz frequency

  2. Position Ring System using Anger Type Detectors. Progress Report (1999-2002)

    International Nuclear Information System (INIS)

    The overall objective of our project was to develop PET scanners and imaging techniques that achieve high performance and excellent image quality. Our approach was based upon 3-D imaging (no septa) with position-sensitive Anger-logic detectors, whereby the encoding ratio of resolution elements to number of photo-multiplier tube channels is very high. This design led to a series of PET systems that emphasized cost-effectiveness and practicality in a clinical environment.

  3. Analysis of operation of thyristor power supply system of the EhKU-6 ring electromagnet

    International Nuclear Information System (INIS)

    In accordance with the program of reconstruction of the Erevan electron synchrotron at 6 GeV and to increase the stability of maanetic field parameters and the operational reliability of the power supply system the ignitron converters have been substituted by the thyristor ones. The thyristor rectifier is assembled on a three-phase bridge circuit utilizing high-voltage water-cooled thyristor modules. Every module consists of six series-connected thyristors. The thyristor mean current is 320 A, the mean current of the rectifier arm is 165 A. Under rated operating conditions of the accelerator the rectified voltage constitutes 4600 V, and the rectified current -330 A. The thyristor conve 330 A. The thyristor converter comprises four parallel branches of two series-connected modules each. The duration of the current pulse at a discharge is 2000 A, the mean discharge current is 125 A, the effective discharge current is 630 A. The tests of the thyristor power supply system demonstrate that the system is simple in operation, reliable, and provides a wide range of control of accelerated particle energies

  4. Sustainable hydrogen by wire. BC Hydro's hydrogen strategy

    International Nuclear Information System (INIS)

    BC Hydro is the third largest electric utility in Canada, providing mainly hydroelectric power to 1,600,000 customers in British Columbia. BC Hydro is pursuing hydrogen as a future growth opportunity to enable British Columbia and Canada to benefit from the hydrogen age. The company currently supplies electricity to produce hydrogen fuel for three Ballard fuel cell buses in the metropolitan Vancouver area and plans to expand its business in the transportation market by using low priced, environmentally responsible electricity to produce hydrogen for vehicle fueling. BC Hydro is forming alliances to develop the hydrogen fueling infrastructure for British Columbia. (author)

  5. Contraceptive vaginal ring (NuvaRing)-a novel, convenient and effective contraceptive option

    Institute of Scientific and Technical Information of China (English)

    Chen Wei-lin; Fan Guang-sheng

    2011-01-01

    Contraceptive vaginal ring (NuvaRing) is a new combined hormonal contraceptive method.Each ring contains 2.7mg ethinyl estradiol (EE) and 11.7mg etonogestrel.The ring is characteristic with its ease of use,lower EE systemic exposure and excellent cycle control.Studies have demonstrated that the efficacy and safety of the ring are equivalent to combined oral contraceptive (COC).The side effects of the ring are fewer and the biocompatibility is good.Recent studies have proved that the NuvaRing is a new,effective hormonal contraceptive option for women.

  6. Near rings, fuzzy ideals, and graph theory

    CERN Document Server

    Satyanarayana, Bhavanari

    2013-01-01

    Near Rings, Fuzzy Ideals, and Graph Theory explores the relationship between near rings and fuzzy sets and between near rings and graph theory. It covers topics from recent literature along with several characterizations. After introducing all of the necessary fundamentals of algebraic systems, the book presents the essentials of near rings theory, relevant examples, notations, and simple theorems. It then describes the prime ideal concept in near rings, takes a rigorous approach to the dimension theory of N-groups, gives some detailed proofs of matrix near rings, and discusses the gamma near

  7. Practical synthesis and cytotoxic evaluation of the pyrazino[1,2-b]-isoquinoline ring system.

    Science.gov (United States)

    Hernández-Vázquez, Eduardo; Miranda, Luis D

    2016-06-01

    A practical three-step protocol for the synthesis of pyrazino[1,2-b]isoquinolines is reported. This approach includes a one-pot parallel cyclization/cyclization parallel process followed by a non-common 6-endo Heck cyclization that transformed previously constructed Ugi adducts into diversely decorated tricyclic systems. Compounds bearing a t-butyl or 2,6-dimethylphenyl substituent showed significant cytotoxic activity. The most active analogue (6p) showed significant activity against HCT-15 and K562 (IC50 = 41.8 ± 3.3 and 57.7 ± 2.1 μM, respectively) with no cytotoxicity against human gingival fibroblasts. PMID:27161451

  8. Exciton interference revealed by energy dependent exciton transfer rate for ring-structured molecular systems

    Energy Technology Data Exchange (ETDEWEB)

    Yan, Yun-An, E-mail: yunan@gznc.edu.cn [Guizhou Provincial Key Laboratory of Computational Nanomaterial Science, Guizhou Education University, Guiyang, Guizhou 550018 (China)

    2016-01-14

    The quantum interference is an intrinsic phenomenon in quantum physics for photon and massive quantum particles. In principle, the quantum interference may also occur with quasi-particles, such as the exciton. In this study, we show how the exciton quantum interference can be significant in aggregates through theoretical simulations with hierarchical equations of motion. The systems under investigation are generalized donor-bridge-acceptor model aggregates with the donor consisting of six homogeneous sites assuming the nearest neighbor coupling. For the models with single-path bridge, the exciton transfer time only shows a weak excitation energy dependence. But models with double-path bridge have a new short transfer time scale and the excitation energy dependence of the exciton transfer time assumes clear peak structure which is detectable with today’s nonlinear spectroscopy. This abnormality is attributed to the exciton quantum interference and the condition for a clear observation in experiment is also explored.

  9. Design and finite element simulation of vacuum systems for insertion devices in Indus-2 storage ring

    International Nuclear Information System (INIS)

    Indus-2 is a 2.5 GeV, 300 mA, Synchrotron Radiation Source (SRS) located at Raja Ramanna Centre for Advanced Technology, Indore. As part of insertion device (ID) development programme two new devices namely, APPLE-2 (Advanced Planar Polarized Light Emitter) type Undulator (also known as U-3 Undulator) and 5 Tesla superconducting wavelength shifter (SWLS) are being developed. APPLE-2 will generate variably polarized synchrotron radiation (SR) required for carrying out magnetic circular dichroism (MCD) and magnetic linear dichroism (MLD) experiments and SWLS will generate synchrotron radiation (SR) with critical photon energy of about 20.8 keV for Energy Dispersive XRD beam line. This paper describes design details and finite element analysis results of various simulations carried out for the vacuum systems of these IDs

  10. Exciton interference revealed by energy dependent exciton transfer rate for ring-structured molecular systems

    International Nuclear Information System (INIS)

    The quantum interference is an intrinsic phenomenon in quantum physics for photon and massive quantum particles. In principle, the quantum interference may also occur with quasi-particles, such as the exciton. In this study, we show how the exciton quantum interference can be significant in aggregates through theoretical simulations with hierarchical equations of motion. The systems under investigation are generalized donor-bridge-acceptor model aggregates with the donor consisting of six homogeneous sites assuming the nearest neighbor coupling. For the models with single-path bridge, the exciton transfer time only shows a weak excitation energy dependence. But models with double-path bridge have a new short transfer time scale and the excitation energy dependence of the exciton transfer time assumes clear peak structure which is detectable with today’s nonlinear spectroscopy. This abnormality is attributed to the exciton quantum interference and the condition for a clear observation in experiment is also explored

  11. Temporal and spatial dynamics of human immunodeficiency virus type 1 circulating recombinant forms 08_BC and 07_BC in Asia.

    Science.gov (United States)

    Tee, Kok Keng; Pybus, Oliver G; Li, Xiao-Jie; Han, Xiaoxu; Shang, Hong; Kamarulzaman, Adeeba; Takebe, Yutaka

    2008-09-01

    Human immunodeficiency virus type 1 (HIV-1) CRF08_BC and CRF07_BC are two major recombinants descended from subtypes B' and C. Despite their massive epidemic impact in China, their migration patterns and divergence times remain unknown. Phylogenetic and population genetic analyses were performed on 228 HIV-1 sequences representing CRF08_BC, CRF07_BC, and subtype C strains from different locations across China, India, and Myanmar. Genome-specific rates of evolution and divergence times were estimated using a Bayesian Markov chain Monte Carlo framework under various evolutionary models. CRF08_BC originated in 1990.3 (95% credible region [CR], 1988.6 to 1991.9) in Yunnan province before spreading to Guangxi (south) and Liaoning (northeast) around 1995. Inside Guangxi region, the eastward expansion of CRF08_BC continued from Baise city (west) to Binyang (central) between 1997 and 1998 and later spread into Pingxiang around 1999 in the south, mainly through injecting drug users. Additionally, CRF07_BC diverged from its common ancestor in 1993.3 (95% CR, 1991.2 to 1995.2) before crossing the border into southern Taiwan in late 1990s. Phylogenetic analysis indicates that both CRF08_BC and CRF07_BC can trace their origins to Yunnan. The parental Indian subtype C lineage likely entered China around 1981.2 (95% CR, 1976.7 to 1985.9). Using a multiple unlinked locus model, we also showed that the dates of divergence calculated in this study may not be significantly affected by intrasubtype recombination among different lineages. This is the first phylodynamic study depicting the spatiotemporal dynamics of HIV/AIDS in East Asia. PMID:18596096

  12. Synthesis and characterization of highly dispersed Pt–TiO2|WC/BC as anode catalyst for methanol oxidation

    International Nuclear Information System (INIS)

    Highlights: • WC could enhance the electron transfer between the catalyst and support and accelerate the oxidation of residual carbon species. • TiO2 could absorb methanol and accelerate the breakage of O–H bond. • An enduring, versatile and renewable materials, bamboo charcoals, which have tremendous mesoporous structure were used as the support. - Abstract: To search the active anode electrocatalyst in direct methanol fuel cells, bamboo charcoals (BC)—supported titanium oxide|tungsten carbide system (TiO2|WC/BC) was constructed with a well defined structure in a designed process. Platinum was homogeneously dispersed on TiO2|WC/BC with an average particle size of 3.75 nm by microwave-assisted ethylene glycol process. The electro-catalytic performance of the catalyst Pt–TiO2|WC/BC toward methanol oxidation reaction (MOR) was studied by cyclic voltammetry (CV), chronoamperometry and CO stripping experiments. Results showed that the new electro-catalyst had a higher activity towards MOR compared with that of Pt–WC/BC and commercial Pt/C. The components in the complex were proved to play different roles in MOR where BC offered the larger surface areas and higher conductivity, the TiO2 could absorb methanol and accelerate the breakage of O–H bond, meanwhile WC may enhance the electron transfer between the catalyst and support and accelerate the oxidation of residual carbon species

  13. P-clean rings

    OpenAIRE

    Weixing Chen

    2006-01-01

    In this paper we unify the structures of various clean rings by introducing the notion of P-clean rings. Some properties of P-clean rings are investigated, which generalize the known results on clean rings, semiclean rings, n-clean rings, and so forth. By the way, we answer a question of Xiao and Tong on n-clean rings in the negative.

  14. Measurement of the B_c Meson Lifetime Using B_c ->J/Psi e nu

    CERN Document Server

    Abulencia, A; Acosta, D; Adelman, J; Affolder, T; Akimoto, T; Albrow, M G; Ambrose, D; Amerio, S; Amidei, D; Anastassov, A; Anikeev, K; Annovi, A; Antos, J; Aoki, M; Apollinari, G; Arguin, J F; Arisawa, T; Artikov, A; Ashmanskas, W; Attal, A; Azfar, F; Azzi-Bacchetta, P; Azzurri, P; Bacchetta, N; Bachacou, H; Badgett, W; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Baroiant, S; Bartsch, V; Bauer, G; Bedeschi, F; Behari, S; Belforte, S; Bellettini, G; Bellinger, J; Belloni, A; Ben Haim, E; Benjamin, D; Beretvas, A; Beringer, J; Berry, T; Bhatti, A; Binkley, M; Bisello, D; Blair, R E; Blocker, C; Blumenfeld, B; Bocci, A; Bodek, A; Boisvert, V; Bölla, G; Bolshov, A; Bortoletto, D; Boudreau, J; Boveia, A; Brau, B; Bromberg, C; Brubaker, E; Budagov, Yu A; Budd, H S; Budd, S; Burkett, K; Busetto, G; Bussey, P; Byrum, K L; Cabrera, S; Campanelli, M; Campbell, M; Canelli, F; Canepa, A; Carlsmith, D; Carosi, R; Carron, S; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chang, S H; Chapman, J; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, I; Cho, K; Chokheli, D; Chou, J P; Chu, P H; Chuang, S H; Chung, K; Chung, W H; Chung, Y S; Ciljak, M; Ciobanu, C I; Ciocci, M A; Clark, A; Clark, D; Coca, M; Compostella, G; Convery, M E; Conway, J; Cooper, B; Copic, K; Cordelli, M; Cortiana, G; Cresciolo, F; Cruz, A; Cuenca-Almenar, C; Cuevas-Maestro, J; Culbertson, R; Cyr, D; Da Ronco, S; D'Auria, S; D'Onofrio, M; Dagenhart, D; De Barbaro, P; De Cecco, S; Deisher, A; De Lentdecker, G; Dell'Orso, Mauro; Delli Paoli, F; Demers, S; Demortier, L; Deng, J; Deninno, M; De Pedis, D; Derwent, P F; Devlin, T; Dionisi, C; Dittmann, J R; Di Turo, P; Dorr, C; Donati, S; Donega, M; Dong, P; Donini, J; Dorigo, T; Dube, S; Ebina, K; Efron, J; Ehlers, J; Erbacher, R; Errede, D; Errede, S; Eusebi, R; Fang, H C; Farrington, S; Fedorko, I; Fedorko, W T; Feild, R G; Feindt, M; Fernández, J P; Field, R; Flanagan, G; Flores-Castillo, L R; Foland, A; Forrester, S; Foster, G W; Franklin, M; Freeman, J C; Furic, I; Gallinaro, M; Galyardt, J; García, J E; García-Sciveres, M; Garfinkel, A F; Gay, C; Gerberich, H; Gerdes, D; Giagu, S; Giannetti, P; Gibson, A; Gibson, K; Ginsburg, C; Giokaris, N; Giolo, K; Giordani, M; Giromini, P; Giunta, M; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldschmidt, N; Goldstein, J; Gómez, G; Gómez-Ceballos, G; Goncharov, M; González, O; Gorelov, I; Goshaw, A T; Gotra, Yu; Goulianos, K; Gresele, A; Griffiths, M; Grinstein, S; Grosso-Pilcher, C; Grundler, U; Guimarães da Costa, J; Gunay-Unalan, Z; Haber, C; Hahn, S R; Hahn, K; Halkiadakis, E; Hamilton, A; Han, B Y; Han, J Y; Handler, R; Happacher, F; Hara, K; Hare, M; Harper, S; Harr, R F; Harris, R M; Hatakeyama, K; Hauser, J; Hays, C; Heijboer, A; Heinemann, B; Heinrich, J; Herndon, M; Hidas, D; Hill, C S; Hirschbuehl, D; Höcker, A; Holloway, A; Hou, S; Houlden, M; Hsu, S C; Huffman, B T; Hughes, R E; Huston, J; Incandela, J R; Introzzi, G; Iori, M; Ishizawa, Y; Ivanov, A; Iyutin, B; James, E; Jang, D; Jayatilaka, B; Jeans, D; Jensen, H; Jeon, E J; Jindariani, S; Jones, M; Joo, K K; Jun, S Y; Junk, T R; Kamon, T; Kang, J; Karchin, P E; Kato, Y; Kemp, Y; Kephart, R; Kerzel, U; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kirsch, L; Klimenko, S; Klute, M; Knuteson, B; Ko, B R; Kobayashi, H; Kondo, K; Kong, D J; Konigsberg, J; Korytov, A; Kotwal, A V; Kovalev, A; Kraan, A C; Kraus, J; Kravchenko, I; Kreps, M; Kroll, J; Krumnack, N; Kruse, M; Krutelyov, V; Kuhlmann, S E; Kusakabe, Y; Kwang, S; Laasanen, A T; Lai, S; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; Lazzizzera, I; LeCompte, T; Lee, J; Lee, Y J; Lee, S W; Lefèvre, R; Leonardo, N; Leone, S; Levy, S; Lewis, J D; Lin, C; Lin, C S; Lindgren, M; Lipeles, E; Liss, T M; Lister, A; Litvintsev, D O; Liu, T; Lockyer, N S; Loginov, A; Loreti, M; Loverre, P F; Lu, R S; Lucchesi, D; Lujan, P; Lukens, P; Lungu, G; Lyons, L; Lys, J; Lysak, R; Lytken, E; Mack, P; MacQueen, D; Madrak, R; Maeshima, K; Mäki, T; Maksimovic, P; Malde, S; Manca, G; Margaroli, F; Marginean, R; Marino, C; Martin, A; Martin, V; Martínez, M; Maruyama, T; Matsunaga, H; Mattson, M E; Mazini, R; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Menzemer, S; Menzione, A; Merkel, P; Mesropian, C; Messina, A; Von der Mey, M; Miao, T; Miladinovic, N; Miles, J; Miller, R; Miller, J S; Mills, C; Milnik, M; Miquel, R; Mitra, A; Mitselmakher, G; Miyamoto, A; Moggi, N; Mohr, B; Moore, R; Morello, M; Movilla-Fernández, P A; Mülmenstädt, J; Mukherjee, A; Müller, T; Mumford, R; Murat, P; Nachtman, J; Naganoma, J; Nahn, S; Nakano, I; Napier, A; Naumov, D; Necula, V; Neu, C; Neubauer, M S; Nielsen, J; Nigmanov, T; Nodulman, L; Norniella, O; Nurse, E; Ogawa, T; Oh, S H; Oh, Y D; Okusawa, T; Oldeman, R; Orava, R; Österberg, K; Pagliarone, C; Palencia, E; Paoletti, R; Papadimitriou, V; Paramonov, A A; Parks, B; Pashapour, S; Patrick, J; Pauletta, G; Paulini, M; Paus, C; Pellett, D E; Penzo, Aldo L; Phillips, T J; Piacentino, G; Piedra, J; Pinera, L; Pitts, K; Plager, C; Pondrom, L; Portell, X; Poukhov, O; Pounder, N; Prakoshyn, F; Pronko, A; Proudfoot, J; Ptohos, F; Punzi, G; Pursley, J; Rademacker, J; Rahaman, A; Rakitine, A; Rappoccio, S; Ratnikov, F; Reisert, B; Rekovic, V; Van Remortel, N; Renton, P B; Rescigno, M; Richter, S; Rimondi, F; Ristori, L; Robertson, W J; Robson, A; Rodrigo, T; Rogers, E; Rolli, S; Roser, R; Rossi, M; Rossin, R; Rott, C; Ruiz, A; Russ, J; Rusu, V; Saarikko, H; Sabik, S; Safonov, A; Sakumoto, W K; Salamanna, G; Salto, O; Saltzberg, D; Sánchez, C; Santi, L; Sarkar, S; Sartori, L; Sato, K; Savard, P; Savoy-Navarro, A; Scheidle, T; Schlabach, P; Schmidt, E E; Schmidt, M P; Schmitt, M; Schwarz, T; Scodellaro, L; Scott, A L; Scribano, A; Scuri, F; Sedov, A; Seidel, S; Seiya, Y; Semenov, A; Sexton-Kennedy, L; Sfiligoi, I; Shapiro, M D; Shears, T G; Shepard, P F; Sherman, D; Shimojima, M; Shochet, M; Shon, Y; Shreyber, I; Sidoti, A; Sinervo, P; Sisakian, A; Sjölin, J; Skiba, A; Slaughter, A J; Sliwa, K; Smith, J R; Snider, F D; Snihur, R; Söderberg, M; Soha, A; Somalwar, S; Sorin, V; Spalding, J; Spezziga, M; Spinella, F; Spreitzer, T; Squillacioti, P; Stanitzki, M; Staveris-Polykalas, A; Saint-Denis, R; Stelzer, B; Stelzer-Chilton, O; Stentz, D; Strologas, J; Stuart, D; Suh, J S; Sukhanov, A; Sumorok, K; Sun, H; Suzuki, T; Taffard, A; Takashima, R; Takeuchi, Y; Takikawa, K; Tanaka, M; Tanaka, R; Tanimoto, N; Tecchio, M; Teng, P K; Terashi, K; Tether, S; Thom, J; Thompson, A S; Thomson, E; Tipton, P; Tiwari, V; Tkaczyk, S; Toback, D; Tokar, S; Tollefson, K; Tomura, T; Tonelli, D; Tonnesmann, M; Torre, S; Torretta, D; Tourneur, S; Trischuk, W; Tsuchiya, R; Tsuno, S; Turini, N; Ukegawa, F; Unverhau, T; Uozumi, S; Usynin, D; Vaiciulis, A W; Vallecorsa, S; Varganov, A; Vataga, E; Velev, G; Veramendi, G; Veszpremi, V; Vidal, R; Vila, I; Vilar, R; Vine, T; Vollrath, I; Volobuev, I P; Volpi, G; Würthwein, F; Wagner, P; Wagner, R G; Wagner, R L; Wagner, W; Wallny, R; Walter, T; Wan, Z; Wang, S M; Warburton, A; Waschke, S; Waters, D; Wester, W C; Whitehouse, B; Whiteson, D; Wicklund, A B; Wicklund, E; Williams, G; Williams, H H; Wilson, P; Winer, B L; Wittich, P; Wolbers, S; Wolfe, C; Wright, T; Wu, X; Wynne, S M; Yagil, A; Yamamoto, K; Yamaoka, J; Yamashita, T; Yang, C; Yang, U K; Yang, Y C; Yao, W M; Yeh, G P; Yoh, J; Yorita, K; Yoshida, T; Yu, G B; Yu, I; Yu, S S; Yun, J C; Zanello, L; Zanetti, A; Zaw, I; Zetti, F; Zhang, X; Zhou, J

    2006-01-01

    We present a measurement of the B_c+ meson lifetime in the semileptonic decay mode Bc+ ->J/Psi e+ nu using the CDF II detector at the Fermilab Tevatron Collider. From a sample of about 360pb-1 p-pbar collisions at sqrt(s)=1.96TeV, we reconstruct J/Psi e+ pairs with invariant mass in the kinematically allowed range 4Bc mesion lifetime 0.463 (+0.073,-0.065)+-0.036 ps.

  15. A RING/DISK/OUTFLOW SYSTEM ASSOCIATED WITH W51 NORTH: A VERY MASSIVE STAR IN THE MAKING

    International Nuclear Information System (INIS)

    Sensitive and high angular resolution (∼0.''4) SO2[222,20 → 221,21] and SiO[5 → 4] line and 1.3 and 7 mm continuum observations made with the Submillimeter Array (SMA) and the Very Large Array (VLA) toward the young massive cluster W51 IRS2 are presented. We report the presence of a large (of about 3000 AU) and massive (40 M sun) dusty circumstellar disk and a hot gas molecular ring around a high-mass protostar or a compact small stellar system associated with W51 North. The simultaneous observations of the silicon monoxide molecule, an outflow gas tracer, further revealed a massive (200 M sun) and collimated (∼140) outflow nearly perpendicular to the dusty and molecular structures suggesting thus the presence of a single very massive protostar with a bolometric luminosity on the order of 105 L sun. A molecular hybrid local thermodynamic equilibrium model of a Keplerian and infalling disk with an inner cavity and a central stellar mass of more than 60 M sun agrees well with the SO2[222,20 → 221,21] line observations. Finally, these results suggest that mechanisms, such as mergers of low- and intermediate-mass stars, might not be necessary for forming very massive stars.

  16. Seismicity Catalog Collection, 2150 BC to 1996 AD

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Seismicity Catalog Collection is a compilation data on over four million earthquakes dating from 2150 BC to 1996 AD from NOAA's National Geophysical Data Center...

  17. Global Significant Volcanic Eruptions Database, 4360 BC to present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Significant Volcanic Eruptions Database is a global listing of over 600 eruptions from 4360 BC to the present. A significant eruption is classified as one that...

  18. Global Significant Earthquake Database, 2150 BC to present

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — The Significant Earthquake Database is a global listing of over 5,700 earthquakes from 2150 BC to the present. A significant earthquake is classified as one that...

  19. Prediction of a low-dense BC2N phase

    International Nuclear Information System (INIS)

    We predict a low-dense phase of ternary boron-carbon-nitrogen compound with a cubic symmetry, named as ld-BC2N. Crystal and electronic structures are studied by the ab initio pseudopotential density functional method. Lattice constant, electronic band structure and density of state as well as the phonon spectrum of ld-BC2N are calculated. Our results show that ld-BC2N is an indirect gap semiconductor with a band gap of 3.6 eV, a theoretical Vickers hardness of 67.5 GPa and the bulk modulus of 280 GPa suggest that ld-BC2N is a superhard material which has low elastic moduli and high hardness compared with cubic BN. (author)

  20. Synthesis and biological evaluation of some polymethoxylated fused pyridine ring systems as antitumor agents.

    Science.gov (United States)

    Rostom, Sherif A F; Hassan, Ghada S; El-Subbagh, Hussein I

    2009-10-01

    A series of 3,5-bis(arylidene)-4-piperidones like chalcone analogues carrying variety of methoxylated aryl groups, pyrazolo[4,3-c]pyridines, pyrido[4,3-d]pyrimidines, and pyrido[3,2-c]pyridines, carrying an arylidene moiety, and some pyrano[3,2-c]pyridines, like flavone and coumarin isosteres, were synthesized and screened for their in-vitro antitumor activity at the National Cancer Institute (NCI, USA). The tested compounds 7, 9, 10, 12, 13, 15, 17, and 19 exhibited a broad spectrum of antitumor activity. Compounds belonging to the pyrazolo[4,3-c]pyridine series proved to be more active than those of the pyrido[3,2-c]pyridine and pyrano[3,2-c]pyridine analogues, in which the monomethoxylated derivatives showed better antitumor activity when compared with their corresponding dimethoxylated congeners. Compound 7 is considered to be the most active member identified in this study with a broad spectrum of activity against 22 different tumor cell lines belonging to the nine subpanels employed, and a particular effectiveness against the breast cancer T-47D cell line (GI 54.7%). The pyrano[3,2-c]pyridine heterocyclic system 19 proved to be the most active antitumor agent among the six-membered fused pyridines, with variable activity against 18 different tumor cell lines, and special activity against the non-small cell lung cancer Hop-92 and ovarian cancer OVCAR-4 cell lines (GI values 63.9 and 48.5%, respectively). PMID:19714673

  1. Study of the use of methanol-filled Er-doped suspended-core fibres in a temperature-sensing ring laser system

    Science.gov (United States)

    Martín, J. C.; Berdejo, V.; Vallés, J. A.; Sánchez-Martín, J. A.; Díez, A.; Andrés, M. V.

    2013-10-01

    We report on an experimental/numerical investigation into the use of methanol-filled Er-doped suspended-core fibres (SCFs) in temperature-sensing ring laser systems. We have adopted a ring laser configuration that includes an Er-doped SCF as a temperature-dependent attenuator (TDA) with a step-index Er-doped fibre (EDF) as the laser active medium. The laser performance dependence on the temperature was measured both in continuous wave (CW) and transient regimes. CW laser output power and build-up time values are compared with those of similar laser systems based on other types of Er-doped PCFs or using other laser configurations. A notable variation of 0.73% °C-1 was achieved in CW operation. Then, by means of parameters obtained by numerically fitting the experimental results, the potential sensing performance of the laser configuration with an SCF as a TDA is studied. Moreover, two ring cavity laser configurations (with the SCF acting basically as an attenuator or also as the active media) are compared and the influence of the position of the coupler inside the ring cavity and the contribution of the erbium doping to improve the sensor features are analysed. The longer interaction lengths compatible with laser action using the Er-doped SCF as a TDA could provide variations of laser output power up to 8.6% °C-1 for 90 mW pump power and a 1 m methanol-filled SCF.

  2. BC Transit Fuel Cell Bus Project: Evaluation Results Report

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Post, M.

    2014-02-01

    This report evaluates a fuel cell electric bus demonstration led by British Columbia Transit (BC Transit) in Whistler, Canada. BC Transit is collaborating with the California Air Resources Board and the U.S. Department of Energy's National Renewable Energy Laboratory to evaluate the buses in revenue service. This evaluation report covers two years of revenue service data on the buses from April 2011 through March 2013.

  3. A Business Plan for Importing BC Wine into Hong Kong

    OpenAIRE

    Au, Ernest

    2011-01-01

    Table wine consumption is growing briskly in Hong Kong, especially after the abolishment of the 80% import duty. Hong Kong consumers are sophisticated and readily buy into the wine culture. Although the marketplace for table wine is crowded, there are virtually no BC products for sale. A marketing opportunity may exist. This analysis examines the viability of a business plan to export premium BC table wine into Hong Kong. Based on an augmented Porter’s Five Forces analysis, the competitive la...

  4. Study on the ϒ(1S→BcDs decay

    Directory of Open Access Journals (Sweden)

    Junfeng Sun

    2016-02-01

    Full Text Available The branching ratio and direct CP asymmetry of the ϒ(1S→BcDs weak decay are estimated with the perturbative QCD approach firstly. It is found that (1 the direct CP-violating asymmetry is close to zero, (2 the branching ratio Br(ϒ(1S→BcDs≳10−10 might be measurable at the future experiments.

  5. Search for Majorana Neutrino Signal in Bc Meson Rare Decay

    Institute of Scientific and Technical Information of China (English)

    BAO Shou-Shan; LI Hong-Lei; SI Zong-Guo; YANG Yi-Bo

    2013-01-01

    We study the Bc meson rare decay in order to search for the Majorana neutrino signal.It is found that the corresponding decay rate is sensitive to the Majorana neutrino mass and mixing angles.The signal of Bc± → l1±l2± M(干)induced by the Majorana neutrino within the mass region mπ < mn <mB may be observed at LHCb.

  6. Architecture for the Secret-Key BC3 Cryptography Algorithm

    Directory of Open Access Journals (Sweden)

    Arif Sasongko

    2011-08-01

    Full Text Available Cryptography is a very important aspect in data security. The focus of research in this field is shifting from merely security aspect to consider as well the implementation aspect. This paper aims to introduce BC3 algorithm with focus on its hardware implementation. It proposes architecture for the hardware implementation for this algorithm. BC3 algorithm is a secret-key cryptography algorithm developed with two considerations: robustness and implementation efficiency. This algorithm has been implemented on software and has good performance compared to AES algorithm. BC3 is improvement of BC2 and AE cryptographic algorithm and it is expected to have the same level of robustness and to gain competitive advantages in the implementation aspect. The development of the architecture gives much attention on (1 resource sharing and (2 having single clock for each round. It exploits regularity of the algorithm. This architecture is then implemented on an FPGA. This implementation is three times smaller area than AES, but about five times faster. Furthermore, this BC3 hardware implementation has better performance compared to BC3 software both in key expansion stage and randomizing stage. For the future, the security of this implementation must be reviewed especially against side channel attack.

  7. Self-gravitation in Saturn's rings

    International Nuclear Information System (INIS)

    In a ring-shaped collisional system self-gravitation reduces the equilibrium values of the geometric and optical thickness. In Saturn's rings both effects are appreciable. The previously found discrepancy between the calculated profile and the observed profile of the rings is chiefly caused by the omission of self-gravitation. (Auth.)

  8. Measurement of the $B_c^{-}$ meson lifetime in the decay $B_{c}^{-} \\rightarrow J/\\psi~\\pi^{-}$

    CERN Document Server

    Aaltonen, T; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Appel, J A; Arisawa, T; Artikov, A; Asaadi, J; Ashmanskas, W; Auerbach, B; Aurisano, A; Azfar, F; Badgett, W; Bae, T; Barbaro-Galtieri, A; Barnes, V E; Barnett, B A; Barria, P; Bartos, P; Bauce, M; Bedeschi, F; Behari, S; Bellettini, G; Bellinger, J; Benjamin, D; Beretvas, A; Bhatti, A; Bisello, D; Bizjak, I; Bland, K R; Blumenfeld, B; Bocci, A; Bodek, A; Bortoletto, D; Boudreau, J; Boveia, A; Brigliadori, L; Bromberg, C; Brucken, E; Budagov, J; Budd, H S; Burkett, K; Busetto, G; Bussey, P; Buzatu, A; Calamba, A; Calancha, C; Camarda, S; Campanelli, M; Campbell, M; Canelli, F; Carls, B; Carlsmith, D; Carosi, R; Carrillo, S; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavaliere, V; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chen, Y C; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, K; Chokheli, D; Chung, W H; Chung, Y S; Ciocci, M A; Clark, A; Clarke, C; Compostella, G; Convery, M E; Conway, J; Corbo, M; Cordelli, M; Cox, C A; Cox, D J; Crescioli, F; Cuevas, J; Culbertson, R; Dagenhart, D; d'Ascenzo, N; Datta, M; de Barbaro, P; Dell'Orso, M; Demortier, L; Deninno, M; Devoto, F; d'Errico, M; Di Canto, A; Di Ruzza, B; Dittmann, J.R; D'Onofrio, M; Donati, S; Dong, P; Dorigo, M; Dorigo, T; Ebina, K; Elagin, A; Eppig, A; Erbacher, R; Errede, S; Ershaidat, N; Eusebi, R; Farrington, S; Feindt, M; Fernandez, J P; Field, R; Flanagan, G; Forrest, R; Frank, M J; Franklin, M; Freeman, J C; Funakoshi, Y; Furic, I; Gallinaro, M; Garcia, J E; Garfinkel, A F; Garosi, P; Gerberich, H; Gerchtein, E; Giagu, S; Giakoumopoulou, V; Giannetti, P; Gibson, K; Ginsburg, C M; Giokaris, N; Giromini, P; Giurgiu, G; Glagolev, V; Glenzinski, D; Gold, M; Goldin, D; Goldschmidt, N; Golossanov, A; Gomez, G; Gomez-Ceballos, G; Goncharov, M; Gonzalez, O; Gorelov, I; Goshaw, A T; Goulianos, K; Grinstein, S; Grosso-Pilcher, C; Group, R C; Guimaraes da Costa, J; Hahn, S R; Halkiadakis, E; Hamaguchi, A; Han, J Y; Happacher, F; Hara, K; Hare, D; Hare, M; Harr, R F; Hatakeyama, K; Hays, C; Heck, M; Heinrich, J; Herndon, M; Hewamanage, S; Hocker, A; Hopkins, W; Horn, D; Hou, S; Hughes, R E; Hurwitz, M; Husemann, U; Hussain, N; Hussein, M; Huston, J; Introzzi, G; Iori, M; Ivanov, A; James, E; Jang, D; Jayatilaka, B; Jeon, E J; Jindariani, S; Jones, M; Joo, K K; Jun, S Y; Junk, T R; Kamon, T; Karchin, P E; Kasmi, A; Kato, Y; Ketchum, W; Keung, J; Khotilovich, V; Kilminster, B; Kim, D H; Kim, H S; Kim, J E; Kim, M J; Kim, S B; Kim, S H; Kim, Y K; Kim, Y J; Kimura, N; Kirby, M; Klimenko, S; Knoepfel, K; Kondo, K; Kong, D J; Konigsberg, J; Kotwal, A V; Kreps, M; Kroll, J; Krop, D; Kruse, M; Krutelyov, V; Kuhr, T; Kurata, M; Kwang, S; Laasanen, A T; Lami, S; Lammel, S; Lancaster, M; Lander, R L; Lannon, K; Lath, A; Latino, G; LeCompte, T; Lee, E; Lee, H S; Lee, J S; Lee, S W; Leo, S; Leone, S; Lewis, J D; Limosani, A; Lin, C J; Lindgren, M; Lipeles, E; Lister, A; Litvintsev, D.O; Liu, C; Liu, H; Liu, Q; Liu, T; Lockwitz, S; Loginov, A; Lucchesi, D; Lueck, J; Lujan, P; Lukens, P; Lungu, G; Lys, J; Lysak, R; Madrak, R; Maeshima, K; Maestro, P; Malik, S; Manca, G; Manousakis-Katsikakis, A; Margaroli, F; Marino, C; Martinez, M; Mastrandrea, P; Matera, K; Mattson, M E; Mazzacane, A; Mazzanti, P; McFarland, K S; McIntyre, P; McNulty, R; Mehta, A; Mehtala, P; Mesropian, C; Miao, T; Mietlicki, D; Mitra, A; Miyake, H; Moed, S; Moggi, N; Mondragon, M N; Moon, C S; Moore, R; Morello, M J; Morlock, J; Movilla Fernandez, P; Mukherjee, A; Muller, Th; Murat, P; Mussini, M; Nachtman, J; Nagai, Y; Naganoma, J; Nakano, I; Napier, A; Nett, J; Neu, C; Neubauer, M S; Nielsen, J; Nodulman, L; Noh, S Y; Norniella, O; Oakes, L; Oh, S H; Oh, Y D; Oksuzian, I; Okusawa, T; Orava, R; Ortolan, L; Pagan Griso, S; Pagliarone, C; Palencia, E; Papadimitriou, V; Paramonov, A A; Patrick, J; Pauletta, G; Paulini, M; Paus, C; Pellett, D E; Penzo, A; Phillips, T J; Piacentino, G; Pianori, E; Pilot, J; Pitts, K; Plager, C; Pondrom, L; Poprocki, S; Potamianos, K; Prokoshin, F; Pranko, A; Ptohos, F; Punzi, G; Rahaman, A; Ramakrishnan, V; Ranjan, N; Redondo, I; Renton, P; Rescigno, M; Riddick, T; Rimondi, F; Ristori, L; Robson, A; Rodrigo, T; Rodriguez, T; Rogers, E; Rolli, S; Roser, R; Ruffini, F; Ruiz, A; Russ, J; Rusu, V; Safonov, A; Sakumoto, W K; Sakurai, Y; Santi, L; Sato, K; Saveliev, V; Savoy-Navarro, A; Schlabach, P; Schmidt, A; Schmidt, E E; Schwarz, T; Scodellaro, L; Scribano, A; Scuri, F; Seidel, S; Seiya, Y; Semenov, A; Sforza, F; Shalhout, S Z; Shears, T; Shepard, P F; Shimojima, M; Shochet, M; Shreyber-Tecker, I; Simonenko, A; Sinervo, P; Sliwa, K; Smith, J R; Snider, F D; Soha, A; Sorin, V; Song, H; Squillacioti, P; Stancari, M; St. Denis, R; Stelzer, B; Stelzer-Chilton, O; Stentz, D; Strologas, J; Strycker, G L; Sudo, Y; Sukhanov, A; Suslov, I; Takemasa, K; Takeuchi, Y; Tang, J; Tecchio, M; Teng, P K; Thom, J; Thome, J; Thompson, G A; Thomson, E; Toback, D; Tokar, S; Tollefson, K; Tomura, T; Tonelli, D; Torre, S; Torretta, D; Totaro, P; Trovato, M; Ukegawa, F; Uozumi, S; Varganov, A; Vazquez, F; Velev, G; Vellidis, C; Vidal, M; Vila, I; Vilar, R; Vizan, J; Vogel, M; Volpi, G; Wagner, P; Wagner, R L; Wakisaka, T; Wallny, R; Wang, S M; Warburton, A; Waters, D; Wester, W C, III; Whiteson, D; Wicklund, A B; Wicklund, E; Wilbur, S; Wick, F; Williams, H H; Wilson, J S; Wilson, P; Winer, B L; Wittich, P; Wolbers, S; Wolfe, H; Wright, T; Wu, X; Wu, Z; Yamamoto, K; Yamato, D; Yang, T; Yang, U K; Yang, Y C; Yao, W M; Yeh, G P; Yi, K; Yoh, J; Yorita, K; Yoshida, T; Yu, G B; Yu, I; Yu, S S; Yun, J C; Zanetti, A; Zeng, Y; Zhou, C; Zucchelli, S

    2013-01-01

    The lifetime of the $B_c^{-}$ meson is measured using 272 exclusive $B_{c}^{-} \\to J/\\psi (\\to \\mu^+\\mu^-) \\pi^-$ decays reconstructed in data from proton-antiproton collisions corresponding to an integrated luminosity of 6.7 fb$^{-1}$ recorded by the CDF II detector at the Fermilab Tevatron. The lifetime of the $B_c^{-}$ meson is measured to be $\\tau$($B_c^{-}$) = 0.452 $\\pm$ 0.048(stat) $\\pm$ 0.027(syst) ps. This is the first measurement of the $B_c^{-}$ meson lifetime in a fully-reconstructed hadronic channel, and it agrees with previous results and has comparable precision.

  9. Investigation of transient processes at the DELTA electron storage ring using a digital bunch-by-bunch feedback system

    International Nuclear Information System (INIS)

    At the 1.5-GeV synchrotron radiation source DELTA, operated by the TU Dortmund University, intensive synchrotron radiation in the spectral range from hard X-rays to THz radiation is generated by the circular deflection of highly relativistic electron bunches. Interacting with the vacuum chamber wall, the electron bunches create electric fields, which can act back on subsequent bunches. With increasing beam current, the excitation is enhanced so that the electron beam is unstable, which means that the electron bunches oscillate longitudinally or transversely relative to their reference position. The oscillations reduce the quality of the synchrotron radiation and limit the maximum storable beam current. Within the scope of this thesis, the beam instabilities at the storage ring were systematically investigated. A digital bunch-by-bunch feedback system was installed and commissioned, which allows to detect and digitize the position of each electron bunch at each turn. Based on the input signal, a correction signal is calculated in order to suppress transverse and longitudinal oscillation of the bunches. In addition, it is possible to excite dedicated bunches. The systematic excitation of all coupled-bunch modes allowed for the first time to determine the damping rates of all 192 eigenmodes of the electron beam. The current dependence of the damping rates was investigated and an instability threshold was found. Besides the investigation of multibunch instabilities, single-bunch instabilities are discussed. In addition, the acquisition unit of the digital feedback system can be triggered on external events. This was used to investigate the injection process and beam losses. It was shown that the transverse feedback system increases the injection efficiency. Another aspect of this thesis is the improvement of the signal quality of ultrashort coherent synchrotron radiation pulses, which are generated by the short-pulse facility at DELTA. The short-pulse facility is based

  10. Investigation of transient processes at the DELTA electron storage ring using a digital bunch-by-bunch feedback system

    Energy Technology Data Exchange (ETDEWEB)

    Hoener, Markus

    2015-07-01

    At the 1.5-GeV synchrotron radiation source DELTA, operated by the TU Dortmund University, intensive synchrotron radiation in the spectral range from hard X-rays to THz radiation is generated by the circular deflection of highly relativistic electron bunches. Interacting with the vacuum chamber wall, the electron bunches create electric fields, which can act back on subsequent bunches. With increasing beam current, the excitation is enhanced so that the electron beam is unstable, which means that the electron bunches oscillate longitudinally or transversely relative to their reference position. The oscillations reduce the quality of the synchrotron radiation and limit the maximum storable beam current. Within the scope of this thesis, the beam instabilities at the storage ring were systematically investigated. A digital bunch-by-bunch feedback system was installed and commissioned, which allows to detect and digitize the position of each electron bunch at each turn. Based on the input signal, a correction signal is calculated in order to suppress transverse and longitudinal oscillation of the bunches. In addition, it is possible to excite dedicated bunches. The systematic excitation of all coupled-bunch modes allowed for the first time to determine the damping rates of all 192 eigenmodes of the electron beam. The current dependence of the damping rates was investigated and an instability threshold was found. Besides the investigation of multibunch instabilities, single-bunch instabilities are discussed. In addition, the acquisition unit of the digital feedback system can be triggered on external events. This was used to investigate the injection process and beam losses. It was shown that the transverse feedback system increases the injection efficiency. Another aspect of this thesis is the improvement of the signal quality of ultrashort coherent synchrotron radiation pulses, which are generated by the short-pulse facility at DELTA. The short-pulse facility is based

  11. Prime rings with PI rings of constants

    CERN Document Server

    Kharchenko, V K; Rodríguez-Romo, S

    1996-01-01

    It is shown that if the ring of constants of a restricted differential Lie algebra with a quasi-Frobenius inner part satisfies a polynomial identity (PI) then the original prime ring has a generalized polynomial identitiy (GPI). If additionally the ring of constants is semiprime then the original ring is PI. The case of a non-quasi-Frobenius inner part is also considered.

  12. Locally finite profinite rings

    OpenAIRE

    Dobrowolski, Jan; Krupiński, Krzysztof

    2013-01-01

    We investigate the structure of locally finite profinite rings. We classify (Jacobson-) semisimple locally finite profinite rings as products of complete matrix rings of bounded cardinality over finite fields, and we prove that the Jacobson radical of any locally finite profinite ring is nil of finite nilexponent. Our results apply to the context of small compact $G$-rings, where we also obtain a description of possible actions of $G$ on the underlying ring.

  13. Weakly Dual Rings

    Institute of Scientific and Technical Information of China (English)

    魏俊潮; 孙建华

    2004-01-01

    In This paper, the concept of weakly dual ring is introduced, which is a proper generalization of the dual ring. If R is a right weakly dual ring, then (1)Z(RR) = J(R); (2) If R is also a zero-division power ring, then R is a right AP-injective ring. In addition, some properties of weakly dual rings are given.

  14. Investigation into the outgassing behaviour of all-metal gate valves, products of VAT company, and the effects on the vacuum system of the BESSY storage ring

    International Nuclear Information System (INIS)

    Efficient utilization of a radiation source depends on the service life of the stored electron beam. One of the operating conditions that have an influence on service life is the interaction of electrons with residual gas in the storage ring, so that maintaining the best possible ultrahigh vacuum during operation is a major prerequisite. The magnitudes of the desorption flows of single system components must be known in order to assess their impact on the gas budget in the storage ring. Further, the composition of those residual gas streams has to be measured in order to exclude the presence of unwanted constituents, hydrogen in particular. The investigations carried out using a gate valve type 47.1 (RF All-Metal Gate Valve, 6', serial number F4710-CE44-AAL0-0016) manufactured by the VAT company, are reported. The results describing the effects of the gate valve on the pressure conditions in the vacuum system are explained. (orig./CB)

  15. Guidance document to the BC emission offsets regulation

    International Nuclear Information System (INIS)

    British Columbia's (BC) emission offset regulations were established under the Greenhouse Gas Reduction Targets Act passed in 2007. Targets for greenhouse gas (GHG) emission reductions included a 6 percent reduction by 2012; an 18 percent reduction by 2016; a 33 percent reduction by 2020; and an 80 percent reduction by 2050. Carbon neutral agreements began in 2008, and covered emissions produced from government business travel and by provincial government ministries and agencies. This report presented a list of key recommendations developed by the Pacific Carbon Trust for use in future carbon offset projects. Recommendations included the use of correct emission factors when quantifying projected emission reductions from an offset project; the use of a robust data management system; and the use of evidence in supporting additionality arguments. The document outlined planning procedures for project baseline selection processes, protocol selections, and the identification of sources sinks and reservoirs. Issues related to quantification and measurements, emissions factors, and accuracy and uncertainty were also addressed. Validation, verification, and contracting options were also presented. 6 tabs., 3 figs.

  16. Asymmetric synthesis of a functionalized tricyclo[6.2.0.02,6]decane ring system present in kelsoene and poduran

    Indian Academy of Sciences (India)

    Amrita Ghosh; Subrata Ghosh

    2014-11-01

    Synthesis of a functionalized tricyclo[6.2.0.02,6]decane derivative in enantiomerically pure form, the core structure present in the natural products kelsoene and poduran, is described. The key steps involve a stereocontrolled copper (I)-catalyzed intramolecular [2+2] photocycloaddition of a 1, 6-diene prepared from D-mannitol to form a substituted bicyclo[3.2.0]heptane derivative and a ring closing olefin metathesis involving the vicinal substituents on the five-membered ring of the bicyclo[3.2.0]heptane derivative.

  17. SOR-ring failure

    International Nuclear Information System (INIS)

    It was in the autumn of 1976 that the SOR-ring (synchrotron radiation storage ring) has commenced the regular operation. Since then, the period when the operation was interrupted due to the failures of SOR-ring itself is in total about 8 weeks. Failures and accidents have occurred most in the vacuum system. Those failure experiences are described on the vacuum, electromagnet, radio-frequency acceleration and beam transport systems with their interrupted periods. The eleven failures in the vacuum system have been reported, such as bellows breakage in a heating-evacuating period, leakage from the bellows of straight-through valves (made in U.S.A. and Japan), and leakage from the joint flange of the vacuum system. The longest interruption was 5 weeks due to the failure of a domestically manufactured straight-through valve. The failures of the electromagnet system involve the breakage in a cooling water system, short circuit of a winding in the Q magnet power transformer, blow of a fuse protecting the deflection magnet power source by the current less than the rating, and others. The failures of the RF acceleration system include the breakage of an output electronic tube the breakage of a cavity ceramic, RF voltage fluctuation due to the contact deterioration at a cavity electrode, and the failure of grid bias power source. It is necessary to select the highly reliable components for the vacuum system because the vacuum system failures require longer time for recovery, and very likely to induce secondary and tertiary failures. (Wakatsuki, Y.)

  18. Radical theory of rings

    CERN Document Server

    Gardner, JW

    2003-01-01

    Radical Theory of Rings distills the most noteworthy present-day theoretical topics, gives a unified account of the classical structure theorems for rings, and deepens understanding of key aspects of ring theory via ring and radical constructions. Assimilating radical theory's evolution in the decades since the last major work on rings and radicals was published, the authors deal with some distinctive features of the radical theory of nonassociative rings, associative rings with involution, and near-rings. Written in clear algebraic terms by globally acknowledged authorities, the presentation

  19. Using Brillouin fiber-optic ring laser to provide base station with uplink optical carrier in a 10 GHz radio over fiber system

    Institute of Scientific and Technical Information of China (English)

    CHEN Hao-shuo; LIN Ru-jian; YE Jia-jun

    2009-01-01

    In this paper, a 10 GHz radio over fiber system is analyzed. The Brillouin fiber-optic ring laser is used in the center station (CS) to suppress the optical carrier for the modulation depth enhancement. Simultaneously, the Stockes waveinduced by the Brillouin amplification injects and locks the Fabry-Perot (FP) laser to output a signal-mode optical source,which works as the uplink optical carrier.

  20. Broadband feedback systems for the damping of coherent beam instabilities in the stretcher ring ELSA; Breitbandige Feedback-Systeme zur Daempfung kohaerenter Strahlinstabilitaeten am Stretcherring ELSA

    Energy Technology Data Exchange (ETDEWEB)

    Roth, Andre

    2012-12-15

    At the Electron Stretcher Facility ELSA an upgrade of the internal beam current up to 200 mA would be desirable in order to increase the intensity of the extracted electron beam for the future experimental hadron physics program. However, such an upgrade is mainly limited by the excitation of coherent beam instabilities in the stretcher ring. As active counteraction, broadband bunch-by-bunch feedback-systems for the longitudinal, as well as for both transverse planes were installed. After detection of the motion of each of the 27 4 stored bunches via beam position monitors, the systems determine independent correction signals for each bunch using digital signal processors. The amplified correction signals are applied to the beam by means of broadband longitudinal and transverse kicker structures. The detailed setup, the commissioning procedure and measurement results of the damping performance of the systems are presented. In addition, the operation of the longitudinal system during the fast energy ramp of 4 GeV/s from 1.2 GeV to 3.2 GeV is investigated.

  1. BC's oil and gas industry : opportunities and challenges

    International Nuclear Information System (INIS)

    An update of the Canadian petroleum and natural gas industry was presented with reference to activity trends and major issues. The presentation also described opportunities and challenges facing the industry in British Columbia and reviewed the impact of federal policies on BC. In recent years the industry has moved to oil sands and unconventional gas, offshore sites, and coalbed methane development. Other changes are a result of technology which makes it possible to drill deeper and faster while having less environmental impact. Government issues have become increasingly complex, however. Industry capital spending from 2000 to 2003 was presented for Northern Canada, the east coast offshore, Alberta, the Western Canada Sedimentary Basin, oil sand deposits, and international activities. The presentation included several graphs depicting: the changing natural gas production mix; North American natural gas demand; wells drilled by province; natural gas resources in BC; upstream capital spending in BC; wells drilled by type and depth in BC; top natural gas wells in 2000 and 2002; natural gas production in BC; finding and development costs for Canadian natural gas; and, the widening gap of the federal income tax rate between oil and natural gas and other industries. British Columbia is in the strategic position of having significant untapped gas potential in the northeastern part of the province. For now, there is sufficient pipeline capacity to bring the gas to markets in the United States where there is a strong demand for electric power generation. 16 figs

  2. The SOCS-box of HIV-1 Vif interacts with ElonginBC by induced-folding to recruit its Cul5-containing ubiquitin ligase complex.

    Directory of Open Access Journals (Sweden)

    Julien R C Bergeron

    Full Text Available The HIV-1 viral infectivity factor (Vif protein recruits an E3 ubiquitin ligase complex, comprising the cellular proteins elongin B and C (EloBC, cullin 5 (Cul5 and RING-box 2 (Rbx2, to the anti-viral proteins APOBEC3G (A3G and APOBEC3F (A3F and induces their polyubiquitination and proteasomal degradation. In this study, we used purified proteins and direct in vitro binding assays, isothermal titration calorimetry and NMR spectroscopy to describe the molecular mechanism for assembly of the Vif-EloBC ternary complex. We demonstrate that Vif binds to EloBC in two locations, and that both interactions induce structural changes in the SOCS box of Vif as well as EloBC. In particular, in addition to the previously established binding of Vif's BC box to EloC, we report a novel interaction between the conserved Pro-Pro-Leu-Pro motif of Vif and the C-terminal domain of EloB. Using cell-based assays, we further show that this interaction is necessary for the formation of a functional ligase complex, thus establishing a role of this motif. We conclude that HIV-1 Vif engages EloBC via an induced-folding mechanism that does not require additional co-factors, and speculate that these features distinguish Vif from other EloBC specificity factors such as cellular SOCS proteins, and may enhance the prospects of obtaining therapeutic inhibitors of Vif function.

  3. Friction between ring polymer brushes.

    Science.gov (United States)

    Erbaş, Aykut; Paturej, Jarosław

    2015-04-28

    Friction between ring polymer brush bilayers sliding past each other at melt densities is studied using extensive coarse-grained molecular dynamics simulations and scaling arguments, and the results are compared to the friction between bilayers of linear polymer brushes. We show that for a velocity range spanning over three decades, the frictional forces measured for ring polymer brushes are half of the corresponding friction in the case of linear brushes. In the linear-force regime, the weak inter-digitation between ring brush layers as compared to linear brushes leads also to a lower number of binary collisions between the monomers from opposing brushes. At high velocities, where the thickness of the inter-digitation between bilayers is on the order of monomer size regardless of brush topology, stretched segments of ring polymers adopt the double-stranded conformation. As a result, monomers of the double-stranded segments collide on average less with the monomers of the opposing ring brush even though a similar number of monomers occupies the inter-digitation layer for ring and linear brush bilayers. The numerical data obtained from our simulations are consistent with the proposed scaling analysis. Conformation-dependent friction reduction observed in ring brushes can have important consequences in non-equilibrium bulk systems. PMID:25747253

  4. Moving ring reactor 'Karin-1'

    International Nuclear Information System (INIS)

    The conceptual design of a moving ring reactor ''Karin-1'' has been carried out to advance fusion system design, to clarify the research and development problems, and to decide their priority. In order to attain these objectives, a D-T reactor with tritium breeding blanket is designed, a commercial reactor with net power output of 500 MWe is designed, the compatibility of plasma physics with fusion engineering is demonstrated, and some other guideline is indicated. A moving ring reactor is composed mainly of three parts. In the first formation section, a plasma ring is formed and heated up to ignition temperature. The plasma ring of compact torus is transported from the formation section through the next burning section to generate fusion power. Then the plasma ring moves into the last recovery section, and the energy and particles of the plasma ring are recovered. The outline of a moving ring reactor ''Karin-1'' is described. As a candidate material for the first wall, SiC was adopted to reduce the MHD effect and to minimize the interaction with neutrons and charged particles. The thin metal lining was applied to the SiC surface to solve the problem of the compatibility with lithium blanket. Plasma physics, the engineering aspect and the items of research and development are described. (Kako, I.)

  5. Prediction of the Bc* Mass in Full Lattice QCD

    International Nuclear Information System (INIS)

    By using the highly improved staggered quark formalism to handle charm, strange, and light valence quarks in full lattice QCD, and NRQCD to handle bottom valence quarks, we are able to determine accurately ratios of the B meson vector-pseudoscalar mass splittings, in particular, [m(Bc*)-m(Bc)]/[m(Bs*)-m(Bs)]. We find this ratio to be 1.15(15), showing the 'light' quark mass dependence of this splitting to be very small. Hence we predict m(Bc*)=6.330(7)(2)(6) GeV, where the first two errors are from the lattice calculation and the third from existing experiment. This is the most accurate prediction of a gold-plated hadron mass from lattice QCD to date.

  6. Superhard and superconductive polymorphs of diamond-like BC3

    International Nuclear Information System (INIS)

    We have explored the crystal structures of synthesized diamond-like BC3 (d-BC3) with particle swarm optimization (PSO) algorithm combined with first-principles structural optimizations. Three intriguing metallic low-energy structures are uncovered: (i) orthorhombic Pmma-a consisting of a sandwich-like 'B-layer' between C layers, (ii) orthorhombic Pmma-b with novel B-B bondings, and (iii) tetragonal P-4m2. The simulated Raman modes of Pmma-b phase are in agreement with experiments. Further hardness and electron-phonon calculations revealed that all the three candidate d-BC3 phases are superhard (>40 GPa) and superconductive materials with the superconducting critical temperature reaching at 16.6-23.4 K for Pmma-a phase.

  7. Involvement of Protein Tyrosine Phosphatases BcPtpA and BcPtpB in Regulation of Vegetative Development, Virulence and Multi-Stress Tolerance in Botrytis cinerea

    OpenAIRE

    Yang, Qianqian; Yu, Fangwei; Yin, Yanni; Ma, Zhonghua

    2013-01-01

    Tyrosine phosphorylation and dephosphorylation have emerged as fundamentally important mechanisms of signal transduction and regulation in eukaryotic cells, governing many processes, but little has been known about their functions in filamentous fungi. In this study, we deleted two putative protein tyrosine phosphatase (PTP) genes (BcPTPA and BcPTPB) in Botrytis cinerea, encoding the orthologs of Saccharomyces cerevisiae Ptp2 and Ptp3, respectively. Although BcPtpA and BcPtpB have opposite fu...

  8. Does the position of the electron-donating nitrogen atom in the ring system influence the efficiency of a dye-sensitized solar cell? A computational study.

    Science.gov (United States)

    Biswas, Abul Kalam; Barik, Sunirmal; Das, Amitava; Ganguly, Bishwajit

    2016-06-01

    We have reported a number of new metal-free organic dyes (2-6) that have cyclic asymmetric benzotripyrrole derivatives as donor groups with peripheral nitrogen atoms in the ring, fluorine and thiophene groups as π-spacers, and a cyanoacrylic acid acceptor group. Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations were employed to examine the influence of the position of the donor nitrogen atom and π-conjugation on solar cell performance. The calculated electron-injection driving force (ΔG inject), electron-regeneration driving force (ΔG regen), light-harvesting efficiency (LHE), dipole moment (μ normal), and number of electrons transferred (∆q) indicate that dyes 3, 4, and 6 have significantly higher efficiencies than reference dye 1, which exhibits high efficiency. We also extended our comparison to some other reported dyes, 7-9, which have a donor nitrogen atom in the middle of the ring system. The computed results suggest that dye 6 possesses a higher incident photon to current conversion efficiency (IPCE) than reported dyes 7-9. Thus, the use of donor groups with peripheral nitrogen atoms appears to lead to more efficient dyes than those in which the nitrogen atom is present in the middle of the donor ring system. Graphical Abstract The locations of the nitrogen atoms in the donor groups in the designed dye molecules have an important influence on DSSC efficiency. PMID:27155868

  9. Vibration reduction on the tunnel floor by suggestion of vibration propagation and remodeling of cooling system in SPring-8 storage ring

    International Nuclear Information System (INIS)

    The vibration source of the magnet and floor was investigated from the time of ring construction completed. The floor vibration in the tunnel only near the cooling machine room seems to travel through the floor from that room. The vibration of the vacuum chamber could not be removed by removing the fluctuation of the water pressure with accumulator. The vibration source seems to be the flowing water in the chamber. The cooling system of the SPring-8 storage ring was remodeled because of aging and efficiency. At the same time many vibration suppression units were inserted between the floor and pillars and the vibration reduction mat under the pump were also graded up. The effect of vibration reduction was large at the maintenance path and small on the tunnel floor. (author)

  10. Development of high-speed reactive processing system for carbon fiber-reinforced polyamide-6 composite: In-situ anionic ring-opening polymerization

    Science.gov (United States)

    Kim, Sang-Woo; Seong, Dong Gi; Yi, Jin-Woo; Um, Moon-Kwang

    2016-05-01

    In order to manufacture carbon fiber-reinforced polyamide-6 (PA-6) composite, we optimized the reactive processing system. The in-situ anionic ring-opening polymerization of ɛ-caprolactam was utilized with proper catalyst and initiator for PA-6 matrix. The mechanical properties such as tensile strength, inter-laminar shear strength and compressive strength of the produced carbon fiber-reinforced PA-6 composite were measured, which were compared with the corresponding scanning electron microscope (SEM) images to investigate the polymer properties as well as the interfacial interaction between fiber and polymer matrix. Furthermore, kinetics of in-situ anionic ring-opening polymerization of ɛ-caprolactam will be discussed in the viewpoint of increasing manufacturing speed and interfacial bonding between PA-6 matrix and carbon fiber during polymerization.

  11. Birth Control Ring

    Science.gov (United States)

    ... Can I Help a Friend Who Cuts? Birth Control Ring KidsHealth > For Teens > Birth Control Ring Print A A A Text Size What's ... Anillo vaginal anticonceptivo What Is It? The birth control ring is a soft, flexible, doughnut-shaped ring ...

  12. BC Transit Fuel Cell Bus Project Evaluation Results: Second Report

    Energy Technology Data Exchange (ETDEWEB)

    Eudy, L.; Post, M.

    2014-09-01

    Second report evaluating a fuel cell electric bus (FCEB) demonstration led by British Columbia Transit (BC Transit) in Whistler, Canada. BC Transit is collaborating with the California Air Resources Board and the U.S. Department of Energy's National Renewable Energy Laboratory to evaluate the buses in revenue service. NREL published its first report on the demonstration in February 2014. This report is an update to the previous report; it covers 3 full years of revenue service data on the buses from April 2011 through March 2014 and focuses on the final experiences and lessons learned.

  13. Effect of the Antisense BcMF12 Driven by the BcA9 Promoter on Gene Silencing in Brassica campestris L. ssp. chinensis

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    The study analyzed the silencing of BcMF12 gene regulated by BcA9 promoter in the transgenic pakchoi and confirmed the effect of antisense BcMF12 gene on the pollen development. A conserved BcMF12 gene fragment was amplified from the cDNA of flower buds in pakchoi (Brassica campestris L. ssp. chinensis, syn. B. rapa L. ssp. chinensis) and was fused to the anther specific BcA9 promoter. The plant antisense expression vector was constructed and then introduced into pakchoi via Agrobacterium-mediated transformation. The transgenic plants were screened by antibiotics and molecular analysis. PCR and Southern blot revealed that the antisense BcMF12-GUS fusion gene regulated by BcA9 promoter was integrated into transgenic plants. Northern blot suggested that the expression of BcMF12 gene was down-regulated significantly. The pollen germination rate of transgenic plants with antisense BcMF12 gene decreased as compared with that of the control plants. The expression of the gene BcMF12 related to the pollen development was inhibited by the antisense BcMF12 driven by BcA9 promoter, which consequently affected the pollen development in pakchoi.

  14. Study of the use of methanol-filled Er-doped suspended-core fibres in a temperature-sensing ring laser system

    International Nuclear Information System (INIS)

    We report on an experimental/numerical investigation into the use of methanol-filled Er-doped suspended-core fibres (SCFs) in temperature-sensing ring laser systems. We have adopted a ring laser configuration that includes an Er-doped SCF as a temperature-dependent attenuator (TDA) with a step-index Er-doped fibre (EDF) as the laser active medium. The laser performance dependence on the temperature was measured both in continuous wave (CW) and transient regimes. CW laser output power and build-up time values are compared with those of similar laser systems based on other types of Er-doped PCFs or using other laser configurations. A notable variation of 0.73% °C−1 was achieved in CW operation. Then, by means of parameters obtained by numerically fitting the experimental results, the potential sensing performance of the laser configuration with an SCF as a TDA is studied. Moreover, two ring cavity laser configurations (with the SCF acting basically as an attenuator or also as the active media) are compared and the influence of the position of the coupler inside the ring cavity and the contribution of the erbium doping to improve the sensor features are analysed. The longer interaction lengths compatible with laser action using the Er-doped SCF as a TDA could provide variations of laser output power up to 8.6% °C−1 for 90 mW pump power and a 1 m methanol-filled SCF. (paper)

  15. Alternative loop rings

    CERN Document Server

    Goodaire, EG; Polcino Milies, C

    1996-01-01

    For the past ten years, alternative loop rings have intrigued mathematicians from a wide cross-section of modern algebra. As a consequence, the theory of alternative loop rings has grown tremendously. One of the main developments is the complete characterization of loops which have an alternative but not associative, loop ring. Furthermore, there is a very close relationship between the algebraic structures of loop rings and of group rings over 2-groups. Another major topic of research is the study of the unit loop of the integral loop ring. Here the interaction between loop rings and group ri

  16. Smart Oceans BC: Supporting Coastal and Ocean Natural Hazards Mitigation for British Columbia

    Science.gov (United States)

    Moran, K.; Insua, T. L.; Pirenne, B.; Hoeberechts, M.; McLean, S.

    2014-12-01

    Smart Oceans BC is a new multi-faceted program to support decision-makers faced with responding to natural disasters and hazards in Canada's Province of British Columbia. It leverages the unique capabilities of Ocean Networks Canada's cabled ocean observatories, NEPTUNE and VENUS to enhance public safety, marine safety and environmental monitoring. Smart Oceans BC combines existing and new marine sensing technology with its robust data management and archive system, Oceans 2.0, to deliver information and science for good ocean management and responsible ocean use. Smart Oceans BC includes new ocean observing infrastructure for: public safety, through natural hazard detection for earthquake groundshaking and near-field tsunamis; marine safety, by monitoring and providing alerts on sea state, ship traffic, and marine mammal presence; and environmental protection, by establishing baseline data in critical areas, and providing real-time environmental observations. Here we present the elements of this new ocean observing initiative that are focused on tsunami and earthquake early warning including cabled and autonomous sensor systems, real-time data delivery, software developments that enable rapid detection, analytics used in notification development, and stakeholder engagement plans.

  17. Key role of water in proton transfer at the Q(o)-site of the cytochrome bc(1) complex predicted by atomistic molecular dynamics simulations

    DEFF Research Database (Denmark)

    Postila, P. A.; Kaszuba, K.; Sarewicz, M.;

    2013-01-01

    Cytochrome (cyt) bc(1) complex, which is an integral part of the respiratory chain and related energy-conserving systems, has two quinone-binding cavities (Q(o)- and Q(i)-sites), where the substrate participates in electron and proton transfer. Due to its complexity, many of the mechanistic details...... of the cyt bc(1) function have remained unclear especially regarding the substrate binding at the Q(o)-site. In this work we address this issue by performing extensive atomistic molecular dynamics simulations with the cyt bc(1) complex of Rhodobacter capsulatus embedded in a lipid bilayer. Based on...

  18. Aktivität Ubiquitin-konjugierender Enzyme an den RING-Ligasen des ERAD-Systems

    OpenAIRE

    Bagola, Katrin

    2012-01-01

    Fehlerhafte sekretorische Proteine werden über einen speziellen Abbauweg, die ER-assoziierte Proteindegradation (ERAD), mit Lysin48-verknüpften Ubiquitinketten polyubiquitiniert und dem proteolytischen Abbau am 26S Proteasom zugeführt. In der Hefe Saccharomyces cerevisiae bilden die beiden ER-membranständigen RING-Ubiquitinligasen Hrd1 und Doa10 zentrale Komponenten im Ubiquitinierungsprozess. Das lösliche zytosolische Ubiquitin-konjugierende Enzym Ubc7, welches mit beiden Ligasen bei der Po...

  19. Synthesis of new cubic C3N4 and diamond-like BC3 phases under high pressure and high temperature

    International Nuclear Information System (INIS)

    In this report, we discuss the progress in synthesis of new binary phases from B-C-N triangle in DAC under high-pressure and high-temperature (HPHT) conditions: cubic C3N4 (c-C3N4) and diamond-like BC3 (d-BC3) phase. These two phases have been synthesized by direct transformation from graphitic phases under HPHT conditions. The c-C3N4 phase was recovered at ambient conditions from the graphite-like C3N4 (g-C3N4) phase subjected to pressures between 21 and 38 GPa in a diamond anvil cell, laser-heated to temperatures between 1600 and 3000 K. The x-ray diffraction data on the new phase are best explained by a cubic unit cell with the lattice parameters a = 3.878±0.001 A. The synthesis of the c-C3N4 phase has been also conducted in a large volume press at pressure 25 GPa and temperature 20000C. X-ray peaks of c-C3N4 phase obtained in the large-volume press are weaker than those of diamonds. Application of the UV Raman spectroscopy revealed that UV Raman spectrum of the g-C3N4 is substantially different from that measured with visible Raman spectroscopy. It has two strong peaks at 690 cm-1 and at 986 cm-1 assigned to different types of the ring (s-triazine ring) breathing modes. A diamond-like BC3 has been synthesized at temperature 2033 ± 241 K and at pressure 50 GPa. The conclusion about the phase transition from graphitic BC3 (g-BC3) to d-BC3 phase was made from the analysis of Raman scattering data. The Raman spectrum of the novel d-BC3 displays all the peaks but one at 671 cm-1 characteristic to Raman spectra the B doped diamond. The peaks pattern of the d-BC3 suggests that this phase could become a superconductor at low temperatures

  20. Persistent current in a magnetized Rashba ring

    Institute of Scientific and Technical Information of China (English)

    Zhang Lin; Wang Jun

    2011-01-01

    We theoretically study the persistent currents flowing in a Rashba quantum ring subjected to the Rashba spinorbit interaction.By introducing uniform or nonuniform magnetization into the ring,we find that a nonzero persistent charge current circulates in the ring,which stems from the original equilibrium spin current due to the Rashba spinorbit interaction.Because of broken time reversal symmetry,the two oppositely flowing spin-up and spin-down charge currents of the equilibrium spin current are no longer equal,and so a net persistent charge current can flow in the system.It is also found that the persistent current can be modulated by the Fermi energy,the Rashba spin-orbit interaction strength and the magnetization in the ring.Moreover,the magnetization perpendicular to the ring plane can optimize the current.The persistent current flowing in the ring is a manifestation of the nonzero equilibrium spin current existing in the ring.

  1. Iron Working in Denmark 500 BC - AD 1000

    DEFF Research Database (Denmark)

    Lyngstrøm, Henriette Syrach

    2008-01-01

    Iron technology was introduced into Denmark c. 500 BC and for the next 1500 years iron was produced from local bog ore. Iron working was practised in ordinary farming villages and was probably a sideline for farmers who lives where bog ore of a suitable quality and a forest large enough to supply...

  2. Marketing strategy for the BC oil and gas service sector

    International Nuclear Information System (INIS)

    The British Columbia (BC) oil and gas service sector is collaborating with the BC Ministry of Energy and Mines (MEM) to enhance the competitiveness of oil and gas service providers in Northeast BC. The MEM agreed to provide one-time funding to develop this marketing strategy for the oil and gas sector, particularly for small to medium-sized companies with limited resources. This document is also a resource tool for suppliers in the sector that have developed and are implementing their own marketing plans and wish to enhance elements of their own plans. The strategy also outlines the potential role of associations in Northeast BC that represent the service sector. It links their marketing activities with the activities of individual service providers. Local service providers (LSP) include companies in a wide range of businesses such as drilling support, transportation, health and safety services, and construction. Six issues that directly impact the competitiveness of LSPs were also presented along with recommendations for participants in the service sector, associations and individual companies. tabs., figs., 11 appendices

  3. Report of the special prosecutor: BC Hydro 'Raiwind' project

    International Nuclear Information System (INIS)

    A special prosecutor has been appointed by the British Columbia Government to assist the Royal Canadian Mounted Police (RCMP) in its investigation, and to render appropriate charging decisions in the matter of the circumstances surrounding the creation of IPC International Power Corporation (IPC) owned by a Mr. John N. Laxton, former Chairman of BC Hydro and his two children, and its joint venture with BC Hydro for the development of an international power project in Pakistan known as the Raiwind project. Of particular concerns were the conflict of interest breached by Mr. Laxton in loaning a substantial sum of money to a principal member of the Pakistani side of the joint venture, and by the former President and CEO of BC Hydro, Mr. John Sheehan, by his purchase of shares of IPC by a company owned by members of his family. In 1996 Mr. Sheehan's employment as President and CEO was terminated by BC Hydro for breaching internal conflict of interest guidelines and for failing to get approval from BC Hydro for the acquisition of IPC shares. Subsequently, Mr. Sheehan commenced an action against BC Hydro for wrongful dismissal, a claim which was upheld by the Supreme Court of British Columbia. The focus of the special prosecutor's criminal investigation ultimately became the conduct of Mr. Laxton and whether a charge could or should be laid under Section 122 of the Criminal Code. The outcome of his investigation, which is discussed in this report, was that there was no substantial likelihood of conviction under the breach or trust provisions of Section 122 with respect to the indirect purchases by Mr. Laxton of shares in IPC. Nor was there any reason to believe that a personal loan made in high-risk circumstances could be a benefit or advantage to the lender. Furthermore, the loan cannot be causally related to any loss or financial harm to BC Hydro. In fact, it could be argued that Mr. Laxton's private decision to make the loan was of real assistance in ensuring that the

  4. A New Damage Detection Method: Big Bang-Big Crunch (BB-BC Algorithm

    Directory of Open Access Journals (Sweden)

    Zahra Tabrizian

    2013-01-01

    Full Text Available The present paper aims to explore damage assessment methodology based on the changes in dynamic parameters properties of vibration of a structural system. The finite-element model is used to apply at an element level. Reduction of the element stiffness is considered for structural damage. A procedure for locating and quantifying damaged areas of the structure based on the innovative Big Bang-Big Crunch (BB-BC optimization method is developed for continuous variable optimization. For verifying the method a number of damage scenarios for simulated structures have been considered. For the purpose of damage location and severity assessment the approach is applied in three examples by using complete and incomplete modal data. The effect of noise on the accuracy of the results is investigated in some cases. A great unbraced frame with a lot of damaged element is considered to prove the ability of proposed method. More over BB-BC optimization method in damage detection is compared with particle swarm optimizer with passive congregation (PSOPC algorithm. This work shows that BB-BC optimization method is a feasible methodology to detect damage location and severity while introducing numerous advantages compared to referred method.

  5. On JB-Rings

    Institute of Scientific and Technical Information of China (English)

    Huanyin CHEN

    2007-01-01

    A ring R is a QB-ring provided that aR + bR = R with a, b ∈ R implies that there exists a y ∈ R such that a+by ∈ R-1q. It is said that a ring R is a JB-ring provided that R/J(R) is a QB-ring, where J(R) is the Jacobson radical of R. In this paper, various necessary and sufficient conditions, under which a ring is a JB-ring, are established. It is proved that JB-rings can be characterized by pseudo-similarity. Furthermore, the author proves that R is a J B-ring iff so is R/J(R)2.

  6. Co-venture between City of North Vancouver and BC Gas Services Inc.

    Energy Technology Data Exchange (ETDEWEB)

    Susak, W. [City of North Vancouver, BC (Canada)

    2001-07-01

    Located on Burrard Inlet, the City of North Vancouver is home to approximately 45,000 people. The main industries were shipbuilding and the forest industry. Currently, the main industry is movies and television production, as other industries have moved away. The prime real estate in controlled by two parties: the City of North Vancouver and Price Waterhouse Coopers, acting as receivers for Versatile Shipyard, which went bankrupt. The author displayed some figures providing an aerial view of the City of North Vancouver along the waterfront. The district energy concept was introduced in 1997, and soon thereafter, a district energy study was initiated for the City. Members of the Federation of Canadian Municipalities went on a study tour of district energy projects in Finland. In cooperation with British Columbia Gas (BC Gas) and British Columbia Hydro (BC Hydro) which is no longer involved, the district energy study was completed two years ago. It was determined that an investment of 15 million dollars would be required to implement district heating in the City. A number of reasons were brought forward to judge this decision unsound. The project was reviewed from scratch, and it was determined that a market must be created for district heating before a financial commitment is made on a large scale distribution network or a central plant. In addition, it was felt that a partnership or strategic alliance with an energy utility was required for this project to succeed. The energy utility would bring competencies, financial muscle, and realistic timeline expectancies. BC Gas stepped forward to fulfill this role, and an interim agreement was drawn. One of the measures resulting from this agreement is that the City demands, where appropriate to do so legally, that all new or retro-fitted buildings have hydronic space and water heating systems compatible with and connectable to, a future district energy system. BC Gas will provide, at no cost to the the builders, heating

  7. Overview of Hydrometeorologic Forecasting Procedures at BC Hydro

    Science.gov (United States)

    McCollor, D.

    2004-12-01

    Energy utility companies must balance production from limited sources with increasing demand from industrial, business, and residential consumers. The utility planning process requires a balanced, efficient, and effective distribution of energy from source to consumer. Therefore utility planners must consider the impact of weather on energy production and consumption. Hydro-electric companies should be particularly tuned to weather because their source of energy is water, and water supply depends on precipitation. BC Hydro operates as the largest hydro-electric company in western Canada, managing over 30 reservoirs within the province of British Columbia, and generating electricity for 1.6 million people. BC Hydro relies on weather forecasts of watershed precipitation and temperature to drive hydrologic reservoir inflow models and of urban temperatures to meet energy demand requirements. Operations and planning specialists in the company rely on current, value-added weather forecasts for extreme high-inflow events, daily reservoir operations planning, and long-term water resource management. Weather plays a dominant role for BC Hydro financial planners in terms of sensitive economic responses. For example, a two percent change in hydropower generation, due in large part to annual precipitation patterns, results in an annual net change of \\50 million in earnings. A five percent change in temperature produces a \\5 million change in yearly earnings. On a daily basis, significant precipitation events or temperature extremes involve potential profit/loss decisions in the tens of thousands of dollars worth of power generation. These factors are in addition to environmental and societal costs that must be considered equally as part of a triple bottom line reporting structure. BC Hydro water resource managers require improved meteorological information from recent advancements in numerical weather prediction. At BC Hydro, methods of providing meteorological forecast data

  8. Wood ethanol: a BC value-added opportunity

    International Nuclear Information System (INIS)

    The environmental, economic and social benefits to be derived from the conversion of woodwaste to ethanol are reviewed as part of the justification by the Greenhouse Gas Forum, a multi-stakeholder environmental advisory group, to recommend to the BC government to support the development and commercialization of technologies to produce ethanol fuel using waste from British Columbia's sawmills. The Greenhouse Gas Forum also recommended government support for the construction of a demonstration ethanol plant by the private sector. The principal arguments underlying the Greenhouse Gas Forum's recommendations are: (1) reduction in BC's greenhouse gas emissions by one mega tonne, or two per cent of BC's 1990 emissions, (2) reducing carbon monoxide , nitrogen oxides, volatile organic compounds and other toxic emissions that contribute to urban smog, and (3) accelerating the elimination of sawmill waste burners and providing a substitute for MMT (methylcyclopentadienyl manganese tricarbonyl, a fuel additive) and MTBE ( methyl tertiary butyl ether, a component used in gasoline), thus helping to reduce health hazards from fine particulate inhalation. Economic and social benefits envisaged include creation of leading edge technology at the University of British Columbia, a substantial number of new jobs, and the potential for the development of various co-products from wood ethanol conversion. The report examines five different technologies to produce ethanol (the processes developed by Iogen, BC International, and Arkenol Inc., the Paszner ACOS process and a gasification-fermentation process), the market demand for ethanol blended gasoline and concludes that there are strong environmental, health and economic reasons for BC to increase the use of wood-ethanol as a transportation fuel and to support the establishment of an ethanol plant using wood residue. 27 refs., 5 tabs., 6 figs., 1 glossary

  9. Ring of FIRE

    OpenAIRE

    Welsch, C.; Ullrich, J.; Gläßner, C.; Kühnel, K.; Schempp, A.; Schmidt-Böcking, H.; Dörner, R.

    2004-01-01

    A small electrostatic storage ring is the central machine of the Frankfurt Ion stoRage Experiments (FIRE) which will be built up at the new Stern-Gerlach-Center of Frankfurt University. With ion energies up to 50 keV it enables the analysis of complex many-particle systems from atoms to very large bio molecules. The high luminosity of the beam allows measurements with many orders of magnitude better resolution compared to traditional measurements. It will be combined with existing experiments...

  10. r-clean rings

    OpenAIRE

    Ashrafi, Nahid; Nasibi, Ebrahim

    2011-01-01

    An element of a ring R is called clean if it is the sum of an idempotent and a unit. A ring R is called clean if each of its element is clean. An element r \\in R called regular if r = ryr for some y \\in R. The ring R is regular if each of its element is regular. In this paper we define a ring is r-clean if each of its elements is the sum of a regular and an idempotent element. We give some relations between r-clean and clean rings. Finally we investigate some properties of r-clean rings.

  11. On Perfectly Clean Rings

    OpenAIRE

    Chen, H.; Halicioglu, S.; Kose, H.

    2013-01-01

    An element $a$ of a ring $R$ is called perfectly clean if there exists an idempotent $e\\in comm^2(a)$ such that $a-e\\in U(R)$. A ring $R$ is perfectly clean in case every element in $R$ is perfectly clean. In this paper, we investigate conditions on a local ring $R$ that imply that $2\\times 2$ matrix rings and triangular matrix rings are perfectly clean. We shall show that for these rings perfect cleanness and strong cleanness coincide with each other, and enhance many known results. We also ...

  12. BC Alaska-Canada gas pipeline

    Energy Technology Data Exchange (ETDEWEB)

    MacDonald, K. [BP Canada Energy Company, Calgary, AB (Canada). BP Alaska Canada Gas Pipelines

    2006-07-01

    The Alaska natural gas pipeline project was discussed in relation to the Canadian oil and gas industry and pipeline infrastructure. Total project costs for the pipeline were estimated at approximately $20 billion. Options out of Alberta include increasing existing capacity to the west coast, as well as expanding pipeline capacity to supply midwest and east coast markets. Existing pipeline systems will be expanded, and a new pipeline from Alaska to Chicago has been proposed. The gas pipeline project is expected to be the largest private construction project in the history of North America, and will provide 6500 jobs in both the United States and Canada. Project challenges to date have included the development of relationships with Aboriginals and First Nations groups in Canada and the United States, as well as ensuring access to efficient, competitive market-based regulatory processes. Project risks to date have included capital and operating cost over-runs, regulatory and legal delays, completion risks, and commodity price risks. Stranded gas act processes were discussed, as well as fiscal contracts related to the legislative and public process. Elements of the fiscal contract were provided, as well as details of First Nations relationships and Crown consultation processes. tabs., figs.

  13. Following Their Footsteps: What Happens to Students Who Move from Research Universities to Other BC Public Post-Secondary Institutions?

    Science.gov (United States)

    Heslop, Joanne

    2011-01-01

    British Columbia has a differentiated post-secondary system in which different kinds of institutions provide students with a wide range of educational program options and numerous opportunities for credential completion. As a result of the many education choices and pathways available to students in BC, they tend to navigate their way through the…

  14. New dust belts of Uranus: one ring, two ring, red ring, blue ring.

    Science.gov (United States)

    de Pater, Imke; Hammel, Heidi B; Gibbard, Seran G; Showalter, Mark R

    2006-04-01

    We compared near-infrared observations of the recently discovered outer rings of Uranus with Hubble Space Telescope results. We find that the inner ring, R/2003 U 2, is red, whereas the outer ring, R/2003 U 1, is very blue. Blue is an unusual color for rings; Saturn's enigmatic E ring is the only other known example. By analogy to the E ring, R/2003 U 1 is probably produced by impacts into the embedded moon Mab, which apparently orbits at a location where nongravitational perturbations favor the survival and spreading of submicron-sized dust. R/2003 U 2 more closely resembles Saturn's G ring, which is red, a typical color for dusty rings. PMID:16601188

  15. Development of MicroTCA-based image processing system for the two-dimensional synchrotron radiation interferometer at the SPring-8 storage ring

    International Nuclear Information System (INIS)

    A two-dimensional synchrotron radiation interferometer for non-destructive diagnostics of transverse electron beam is operating in the SPring-8 storage ring. Its interferogram has been captured and processed by a conventional PC-based system. In order to upgrade the interferometer for real-time measurement of the sizes and tilt angle of a transverse electron beam profile with elliptical Gaussian distribution, we have developed a new image processing system based on MicroTCA platform. The platform has an advantage over PC in robustness and scalability due to its hot-swappable modular architecture. The new system is built with commercial-off-the-shelf products to reduce development cost and time. It consists of an MCH, processor AMCs, a user-configurable Spartan6 FPGA AMC with an FMC slot and a CameraLink FMC. The CameraLink IP core is newly developed in compliance with the AXI4 open-bus to enhance reusability. A dedicated processor AMC that communicates with the primary processor AMC is added for fast 2D-fitting calculation to achieve real-time measurement of the beam sizes and the beam-tilt angle during the storage ring operation. (author)

  16. Groups, rings, modules

    CERN Document Server

    Auslander, Maurice

    2014-01-01

    This classic monograph is geared toward advanced undergraduates and graduate students. The treatment presupposes some familiarity with sets, groups, rings, and vector spaces. The four-part approach begins with examinations of sets and maps, monoids and groups, categories, and rings. The second part explores unique factorization domains, general module theory, semisimple rings and modules, and Artinian rings. Part three's topics include localization and tensor products, principal ideal domains, and applications of fundamental theorem. The fourth and final part covers algebraic field extensions

  17. Muon storage ring

    CERN Multimedia

    1974-01-01

    The muon storage ring where the g-2 of the muon is being measured with extremely high accuracy. The ring is 14-m in diameter and has very precise magnetic bending and electric focussing fields so that the muons orbit the ring under well-defined conditions.

  18. Rings Around Uranus

    Science.gov (United States)

    Maran, Stephen P.

    1977-01-01

    Events leading up to the discovery of the rings of Uranus are described. The methods used and the logic behind the methods are explained. Data collected to prove the existence of the rings are outlined and theories concerning the presence of planetary rings are presented. (AJ)

  19. Some quantity aspects of the solar radiation in Mexicali, B.C., Mexico; Algunos aspectos cuantitativos de la radiacion solar en Mexicali, B.C., Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Garcia Cueto; Rafael [Instituto de Ingenieria, U.A.B.C., Mexicali, Baja California (Mexico)

    2000-07-01

    Study of the global solar radiation is very useful for assesing the potential efficiency of systems designed for solar energy utilization. This paper explore some aspects of solar in Mexicali, B.C., Mexico, analysis of the monthly averages global solar radiation and general atmospheric transparency for the year 1998 are discussed. The statistical distribution of the clearness index is determined using histograms of frequencies. The percentage number of days with solar radiation values bellow a certain value is analyzed and discussed. The period of successive days having radiation less than 10 MJ/m{sup 2} dia-1 and 13 MJ/m{sup 2} dia{sup -}1 is examined and presented graphically. [Spanish] El estudio de la radiacion solar global es muy util para evaluar la eficiencia potencial de sistemas que en su diseno esten basados en la utilizacion de energia solar. En particular, en este articulo se exploran algunos aspectos cuantitativos de la radiacion solar en Mexicali, B.C., Mexico: se analizan los promedios mensuales de radiacion solar global y la transparencia atmosferica para el ano de 1998. Se determina la distribucion estadistica del indice de claridad usando histogramas de frecuencias. Se analizan y discuten el porcentaje de dias con valores de radiacion solar inferiores a cierto valor y se presentan graficamente el periodo de dias sucesivos que tienen valores de radiacion menores a 10 MJ/m{sup 2} dia{sup -}1 y 13MJ/m{sup 2} dia{sup -}1.

  20. Human behaviour towards climatic change during the 4th millennium BC in the Swiss Alpine forelands

    DEFF Research Database (Denmark)

    Karg, Sabine

    Human behaviour towards climatic change during the 4th millennium BC in the Swiss Alpine forelands.......Human behaviour towards climatic change during the 4th millennium BC in the Swiss Alpine forelands....

  1. Note: Reliable, robust measurement system for trace moisture in gas at parts-per-trillion levels using cavity ring-down spectroscopy

    Science.gov (United States)

    Abe, Hisashi; Lisak, Daniel; Cygan, Agata; Ciuryło, Roman

    2015-10-01

    We report a simple, robust cavity ring-down spectroscopy system to reliably measure trace moisture in gases at parts-per-trillion (ppt) levels. The performance of the system was evaluated on the basis of experiments performed in a manner traceable to the International System of Units. The obtained result was in good agreement with the primary trace-moisture standard at 12 nmol/mol (12 ppb) in N2 in amount-of-substance fraction. Measurement capability of residual moisture in high-purity dry N2 at ˜130 pmol/mol (130 ppt) was demonstrated, and background noise of 5.3 × 10-12 cm-1 was attained, corresponding to a minimum detectable H2O of 5 pmol/mol (5 ppt).

  2. Application of Bacterial Cellulose (BC) in Natural Facial Scrub

    OpenAIRE

    Norhasliza Hasan; Dayang Radiah Awang Biak; Suryani Kamarudin

    2012-01-01

    A new facial scrub containing only natural ingredients and powdered bacterial cellulose (BC) was formulated. The other ingredients used in the formulation include powdered glutinous rice, aloe vera extract, ascorbic acid (Vitamin C) powder and olive oil. The rheological behaviours of the formulated and commercial facial scrubs were tested using plate and plate rheometer. Both formulated and commercial facial scrubs shows shear thinning  behaviour (non-Newtonian liquid). The formulated facial ...

  3. How urban was fifth-century BC Bourges?

    OpenAIRE

    Kaenel, Gilbert

    2010-01-01

    These two simultaneously published works mark an important stage in French Iron Age research, for the end of the early (or first) Iron Age and beginning of the later (or second) Iron Age, i.e. the Hallstatt D and La Tene A phases. The discoveries made since the nineteenth century in Bourges in central France carried out as a prerequisite of urban and suburban redevelopment since the 1980s, have radically altered our understanding of the sixth and fifth centuries BC.

  4. Exploring distributed leadership in the BC Sepsis Network.

    Science.gov (United States)

    Gorley, Charlotte; Lindstrom, Ronald R; McKeown, Shari; Krause, Christina; Pamplin, Chantale; Sweet, David; Marsden, Julian; Kennedy, Colleen

    2016-03-01

    Commissioned research was undertaken to explore the role of networks in supporting large-scale change and improvement. Participatory action research and social network analysis were used to study the BC Sepsis Network. Findings of this research include insights into distributed leadership, enablers and barriers within a network approach; the importance of relationships and trust; and the need for meaningful and timely data. Recommendations are made for health leaders who are considering utilizing networks for improving patient quality and safety. PMID:26872797

  5. Third millennium BC ditched enclosures in central Iberia

    OpenAIRE

    Díaz del Río, Pedro

    2003-01-01

    This article examines contextual data from three Copper Age ditched enclosures excavated between 1997 and 2001 in the middle Tagus basin. Calibrated radiocarbon dates suggest that they were all constructed and backfilled during the first half of the third millennium BC. Key characteristics are their heterogeneous topographic position, variable visibility, small size and high density of features and domestic refuse. All evidence supports their interpretation as small occupation sites. Finally,...

  6. An organization structure analysis for BC Hydro, Power Smart

    OpenAIRE

    Lellis, Leandro Bianchi

    2006-01-01

    Power Smart is BC Hydro’s demand-side management (DMS) initiative to encourage energy efficiency by its customers. Currently, they are in the midst of a very significant program redesign to influence their largest transmission voltage customers to use energy efficiently without the capability to award a capital incentive. From their internal operating model perspective, Power Smart is considering moving from an audit based function to a more consultative role. This project aims to provide and...

  7. BC nanofibres : in vitro study of genotoxicity and cell proliferation

    OpenAIRE

    Moreira, Susana Margarida Gomes; Silva, Naisandra Bezerra; Almeida-Lima, Jailma; Rocha, Hugo Alexandre Oliveira; Medeiros, Silvia Regina Batistuzzo; Alves Junior, Clodomiro; Gama, F. M.

    2009-01-01

    Nanomaterials have unusual properties not found in the bulk materials, which can be exploited in numerous applications such as biosensing, electronics, scaffolds for tissue engineering, diagnostics and drug delivery. However, research in the past few years has turned up a range of potential health hazards, which has given birth to the new discipline of nanotoxicology. Bacterial cellulose (BC) is a promising material for biomedical applications, namely due its biocompatibility. Alt...

  8. Bethe Ansatz for the Ruijsenaars Model of BC_1-Type

    Directory of Open Access Journals (Sweden)

    Oleg Chalykh

    2007-02-01

    Full Text Available We consider one-dimensional elliptic Ruijsenaars model of type $BC_1$. It is given by a three-term difference Schrödinger operator $L$ containing 8 coupling constants. We show that when all coupling constants are integers, $L$ has meromorphic eigenfunctions expressed by a variant of Bethe ansatz. This result generalizes the Bethe ansatz formulas known in the $A_1$-case.

  9. 5,10b-Ethanophenanthridine amaryllidaceae alkaloids inspire the discovery of novel bicyclic ring systems with activity against drug resistant cancer cells.

    Science.gov (United States)

    Henry, Sean; Kidner, Ria; Reisenauer, Mary R; Magedov, Igor V; Kiss, Robert; Mathieu, Véronique; Lefranc, Florence; Dasari, Ramesh; Evidente, Antonio; Yu, Xiaojie; Ma, Xiuye; Pertsemlidis, Alexander; Cencic, Regina; Pelletier, Jerry; Cavazos, David A; Brenner, Andrew J; Aksenov, Alexander V; Rogelj, Snezna; Kornienko, Alexander; Frolova, Liliya V

    2016-09-14

    Plants of the Amaryllidaceae family produce a large variety of alkaloids and non-basic secondary metabolites, many of which are investigated for their promising anticancer activities. Of these, crinine-type alkaloids based on the 5,10b-ethanophenanthridine ring system were recently shown to be effective at inhibiting proliferation of cancer cells resistant to various pro-apoptotic stimuli and representing tumors with dismal prognoses refractory to current chemotherapy, such as glioma, melanoma, non-small-cell lung, esophageal, head and neck cancers, among others. Using this discovery as a starting point and taking advantage of a concise biomimetic route to the crinine skeleton, a collection of crinine analogues were synthetically prepared and evaluated against cancer cells. The compounds exhibited single-digit micromolar activities and retained this activity in a variety of drug-resistant cancer cell cultures. This investigation resulted in the discovery of new bicyclic ring systems with significant potential in the development of effective clinical cancer drugs capable of overcoming cancer chemotherapy resistance. PMID:27218860

  10. Skew polynomial rings over abelian and idempotent reflexive rings

    OpenAIRE

    Louzari, Mohamed

    2015-01-01

    Let $R$ be a ring and $\\sigma$ an endomorphism of $R$. In this note, we study skew polynomial rings and skew power series rings over idempotent reflexive rings and abelian rings. Also, we introduce the concept of right (resp., left) $\\sigma$-idempotent reflexive rings which generalizes right (resp., left) idempotent reflexive rings and $\\sigma$-abelian rings. Certain results are obtained as corollaries from our results.

  11. The BC energy plan : a vision for clean energy leadership

    International Nuclear Information System (INIS)

    Global warming is a pertinent environmental issue. This report presented a vision and plan for clean energy leadership in British Columbia (BC). The intent of the plan is make the province energy self-sufficient while taking responsibility for the natural environment and climate. The BC energy plan set out targets as well as a strategy for reducing greenhouse gas emissions. The plan outlines the steps that industry, environmental agencies, communities and citizens must take to reach goals for conservation, energy efficiency and clean energy. This report provided highlights of the BC energy plan and discussed energy conservation and efficiency targets. It also discussed electricity security and public ownership of electricity in addition to strategies and policy options for reducing greenhouse gas emissions from electricity. The report presented several policy options for alternative energy including an innovative clean energy fund; generating electricity from mountain pine beatlewood to turn wood waste into energy; and transportation strategies. The report also discussed electricity options such as bioenergy; coal thermal power; geothermal; hydrogen and fuel cell technology; large hydroelectric dams; natural gas; small hydro; solar; tidal energy; and wind. Other topics that were addressed in the report included skills, training and labour; and, oil and gas policy actions. A summary of policy actions was also presented. tabs., figs

  12. $B^+_c$ meson production, decays and properties at LHCb

    CERN Multimedia

    Lusiani, Alberto

    2016-01-01

    We report the first study of the $B_c^+ \\to K^+K^-\\pi^+$ decay and an update of the measurement of the ratio of branching fractions $R_{K/\\pi} \\equiv {\\cal B}(B_c^+\\to J/\\psi K^+)/{\\cal B}(B_c^+\\to J/\\psi\\pi^+)$. Both results use an integrated luminosity of $3.0fb^{-1}$ collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of 7 and 8 TeV. We measure $B_c^+ \\to \\chi_{c0}(\\to K^+ K^-)\\pi^+$ with $4.0\\sigma$ significance and $\\frac {\\sigma(B_c^+)} {\\sigma(B^+)}$ X ${\\cal B}(B_c^+ \\to \\chi_{c0}\\pi^+)$ to be $(9.8^{+3.4}_{-3.0}(stat) \\pm 0.8(syst))$ X $10^{-6}$. The contribution of $B_c^+ \\to K^+K^-\\pi^+$ via $\\overline{b}c$ weak annihilation for $m(K^-\\pi^+) < 1.834 GeV$ is measured with $2.4\\sigma$ significance. The ratio of branching fractions $R_{K/\\pi} \\equiv {\\cal B}(B_c^+ \\to J/\\psi K^+) / {\\cal B}(B_c^+ \\to J/\\psi \\pi^+)$ is measured to be $R_{K/\\pi} = 0.079 \\pm 0.007(stat) \\pm 0.003(syst)$. This result significantly improves the previous LHCb measurement.

  13. Envelopes of Commutative Rings

    Institute of Scientific and Technical Information of China (English)

    Rafael PARRA; Manuel SAOR(I)N

    2012-01-01

    Given a significative class F of commutative rings,we study the precise conditions under which a commutative ring R has an F-envelope.A full answer is obtained when.F is the class of fields,semisimple commutative rings or integral domains.When F is the class of Noetherian rings,we give a full answer when the Krull dimension of R is zero and when the envelope is required to be epimorphic.The general problem is reduced to identifying the class of non-Noetherian rings having a monomorphic Noetherian envelope,which we conjecture is the empty class.

  14. Physics of quantum rings

    CERN Document Server

    Fomin, Vladimir M

    2013-01-01

    This book deals with a new class of materials, quantum rings. Innovative recent advances in experimental and theoretical physics of quantum rings are based on the most advanced state-of-the-art fabrication and characterization techniques as well as theoretical methods. The experimental efforts allow to obtain a new class of semiconductor quantum rings formed by capping self-organized quantum dots grown by molecular beam epitaxy. Novel optical and magnetic properties of quantum rings are associated with non-trivial topologies at the nanoscale. An adequate characterization of quantum rings is po

  15. Binding of the Respiratory Chain Inhibitor Antimycin to theMitochondrial bc1 Complex: A New Crystal Structure Reveals an AlteredIntramolecular Hydrogen-Bonding Pattern

    Energy Technology Data Exchange (ETDEWEB)

    Huang, Li-shar; Cobessi, David; Tung, Eric Y.; Berry, Edward A.

    2005-05-10

    Antimycin A (antimycin), one of the first known and most potent inhibitors of the mitochondrial respiratory chain, binds to the quinone reduction site of the cytochrome bc1 complex.Structure-activity-relationship studies have shown that the N-formylamino-salicyl-amide group is responsible for most of the binding specificity, and suggested that a low pKa for the phenolic OH group and an intramolecular H-bond between that OH and the carbonyl O of the salicylamide linkage are important. Two previous X-ray structures of antimycin bound to vertebrate bc1 complex gave conflicting results. A new structure reported here of the bovine mitochondrial bc1 complex at 2.28Angstrom resolution with antimycin bound, allows us for the first time to reliably describe the binding of antimycin and shows that the intramolecular hydrogen bond described in solution and in the small-molecule structure is replaced by one involving the NH rather than carbonyl O of the amide linkage, with rotation of the amide group relative to the aromatic ring. The phenolic OH and formylamino N form H-bonds with conserved Asp228 of cyt b, and the formylamino O H-bonds via a water molecule to Lys227. A strong density the right size and shape for a diatomic molecule is found between the other side of the dilactone ring and the alpha-A helix.

  16. New Dust Belts of Uranus: One Ring, Two Ring, Red Ring, Blue Ring

    Energy Technology Data Exchange (ETDEWEB)

    de Pater, I; Hammel, H B; Gibbard, S G; Showalter, M R

    2006-02-02

    We compare near-infrared observations of the recently discovered outer rings of Uranus with HST results. We find that the inner ring, R/2003 U 2, is red, whereas the outer ring, R/2003 U 1, is very blue. Blue is an unusual color for rings; Saturn's enigmatic E ring is the only other known example. By analogy to the E ring, R/2003 U 1 is probably produced via impacts into the embedded moon Mab, which apparently orbits at a location where non-gravitational perturbations favor the survival and spreading of sub-micron sized dust. R/2003 U 2 more closely resembles Saturn's G ring.

  17. 21 CFR 528.1070 - Bc6 recombinant deoxyribonucleic acid construct.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 6 2010-04-01 2010-04-01 false Bc6 recombinant deoxyribonucleic acid construct... ANIMALS § 528.1070 Bc6 recombinant deoxyribonucleic acid construct. (a) Specifications and indications for use. Five copies of a human Bc6 recombinant deoxyribonucleic acid (rDNA) construct located at the...

  18. BcBcJ/ψ vertex form factor at finite temperature in the framework of QCD sum rules approach

    International Nuclear Information System (INIS)

    The strong form factor of the BcBcJ/ψ vertex is calculated in the framework of the QCD sum rules method at finite temperature. Taking into account additional operators appearing at finite temperature, a thermal Wilson expansion is obtained and QCD sum rules are derived. While increasing the temperature, the strong form factor remains unchanged up to T ≅ 100 MeV but slightly increases after this point. After T ≅ 160 MeV, the form factor suddenly decreases up to T ≅ 170 MeV. The obtained result of the coupling constant by fitting the form factor at Q2 = -m2offshell at T = 0 is in a very good agreement with the QCD sum rules calculations in the case of vacuum. Our prediction can be checked in future experiments. (orig.)

  19. The Next Linear Collider Damping Ring Complex

    International Nuclear Information System (INIS)

    We report progress on the design of the Next Linear Collider (NLC) Damping Rings complex (DRC) [1]. The purpose of the DRC is to provide 120 Hz, low emittance electron and positron bunch trains to the NLC linacs [2]. It consists of two 1.98 GeV main damping rings, one positron pre-damping ring, two pairs of bunch length and energy compressor systems and interconnecting transport lines. The 2 main damping rings store up to 0.8 amp in 3 trains of 95 bunches each and have normalized extracted beam emittances γ(varepsilon)x = 3 (micro)m-rad and γ(varepsilon)y = 0.03 (micro)m-rad. The preliminary optical design, performance specifications and tolerances are given in [1]. Key subsystems include (1) the 714 MHz RF system [3], (2) the 60 ns risetime injection/extraction pulsed kicker magnets [4], (3) the 44 m wiggler magnet system, (4) the arc and wiggler vacuum system, (5) the radiation management system, (6) the beam diagnostic instrumentation, (7) special systems used for downstream machine protection and (8) feedback-based stabilization systems. Experience at the SLAC Linear Collider has shown that the NLC damping rings will have a pivotal role in the operation of the high power linacs. The ring dynamics and instabilities will in part determine the design choices made for the NLC machine protection system. This paper includes a summary overview of the main ring design and key subsystem components

  20. Traversable wormholes the Roman ring

    CERN Document Server

    Visser, M

    1997-01-01

    In this brief report I introduce a yet another class of geometries for which semi-classical chronology protection theorems are of dubious physical reliability. I consider a ``Roman ring'' of traversable wormholes, wherein a number of wormholes are arranged in a ring in such a manner that no subset of wormholes is near to chronology violation, though the combined system can be arbitrarily close to chronology violation. I show that (with enough wormholes in the ring) the gravitational vacuum polarization (the expectation value of the quantum stress-energy tensor) can be made arbitrarily small. In particular the back-reaction can be kept arbitrarily small all the way to the ``reliability horizon''---so that semi-classical quantum gravity becomes unreliable before the gravitational back reaction becomes large.

  1. Efficient Diethylzinc/Gallic Acid and Diethylzinc/Gallic Acid Ester Catalytic Systems for the Ring-Opening Polymerization of rac-Lactide

    Directory of Open Access Journals (Sweden)

    Karolina Żółtowska

    2015-12-01

    Full Text Available Polylactide (PLA represents one of the most promising biomedical polymers due to its biodegradability, bioresorbability and good biocompatibility. This work highlights the synthesis and characterization of PLAs using novel diethylzinc/gallic acid (ZnEt2/GAc and diethylzinc/propyl gallate (ZnEt2/PGAc catalytic systems that are safe for human body. The results of the ring-opening polymerization (ROP of rac-lactide (rac-LA in the presence of zinc-based catalytic systems have shown that, depending on the reaction conditions, “predominantly isotactic”, disyndiotactic or atactic PLA can be obtained. Therefore, the controlled and stereoselective ROP of rac-LA is discussed in detail in this paper.

  2. Cadmium Toxicity to Ringed Seals (Phoca hispida)

    DEFF Research Database (Denmark)

    Sonne, Christian; Dietz, R.; Riget, F. F.;

    Cadmium concentrations in kidneys from ringed seals (Phoca hispida) from North West Greenland (Qaanaaq) are high. Concentrations range at level known to induce renal toxic effects (mainly tubulopathy) and demineralisation (osteopenia) of the skeletal system (Fanconi's Syndrome) in humans as well...... the absence of toxic effects of cadmium in ringed seal...

  3. Optimum solution of dual-ring double-scattering system for an incident beam with given phase space for proton beam spreading

    CERN Document Server

    Takada, Y

    2002-01-01

    A systematic method is given for deriving optimum scatterer parameters for the dual-ring double-scattering system for the incident proton beam with the given phase space parameters. This is accomplished by relating it to the known optimum solution for zero-emittance beam. Limitations on the phase space parameters of the beam incident on the first scatterer have been clarified to obtain such valid solutions. It is shown that the dual-ring double-scattering method can be applied to an incident beam with emittance as large as 100-200 pi mm mrad. The effect of the change of phase space parameters on the lateral distribution has been investigated. It was found that the larger the emittance of the beam, the more sensitive the fluence distribution is to the change of phase space parameters. The effect of the different emittances of the incident beam in x-theta, y-phi spaces is discussed. It is shown that lateral distribution is sensitive to the misalignment of the beam.

  4. Pulling the plug : how the Liberals' plan to dismantle BC Hydro threatens taxpayers, businesses, communities and jobs

    International Nuclear Information System (INIS)

    The British Columbia government is planning to sell-off and deregulate the province's integrated, publicly-owned electric utilities despite election promises not to do so. The author argues that the consequences will be catastrophic with massive price increasing, rolling brownouts and service cuts. A recent poll indicates that 76 per cent of British Columbians oppose the decision to sell, 68 per cent do not support deregulation, and 83 per cent support a full public consultation before any changes are made. In response, the BC Citizens for Public Power Society was formed to give voice to British Columbians demand that their power system remain in public hands. This report presents a chronology of events for BC Hydro, and describes the experience of other jurisdictions with electricity deregulation. The BC Task Force on Energy Policy has released a report which claims that a fully competitive energy market will attract private capital and bring more energy supply, thereby lowering energy costs and increasing energy security. British Columbians condemn that report, arguing that it is too ideological and poorly substantiated. This paper discusses the impact that deregulation would have on the transmission system, the environment, and on local governments and small communities. It was noted that if the public electricity resources are removed from public ownership and control, the province's future options will be restricted under the North American Free Trade Agreement (NAFTA) and the General Agreement on Trade in Services (GATS). The BC Citizens for Public Power Society argues that the future power needs of the province are best met by public investment and energy conservation using BC Hydro. 65 refs

  5. Diamond-like BC3 as a superhard conductor identified by ideal strength calculations

    International Nuclear Information System (INIS)

    We present first-principles calculations on the ideal strength of a diamond-like (d-) BC3 phase under tensile and shear deformation. The results show that d-BC3 is comparable in strength to cubic BN, the second (only to diamond) hardest material known. Moreover, the calculated electronic density of states reveal that d-BC3 is metallic not only at equilibrium but also under large tensile and shear deformation, making it the hardest conductor studied to date. We identify a metastable graphitic BC3 precursor that has a low energy barrier to transform into d-BC3

  6. Storage ring development at the National Synchrotron Light Source

    International Nuclear Information System (INIS)

    This report contains papers on the following topics: Transverse Beam Profile Monitor; Bunch Length Measurements in the VUV Storage Ring; Photoelectric Effect Photon Beam Position Monitors; RF Receivers for Processing Electron Beam Pick-up Electrode Signals; Real-Time Global Orbit Feedback Systems; Local Orbit Feedback; Active Interlock System for High Power Insertion Devices in the X-ray Ring; Bunch Lengthening Cavity for the VUV Ring; SXLS Storage Ring Design

  7. Designing a ring-VCO for RFID transponders in 0.18 μm CMOS process.

    Science.gov (United States)

    Jalil, Jubayer; Reaz, Mamun Bin Ibne; Bhuiyan, Mohammad Arif Sobhan; Rahman, Labonnah Farzana; Chang, Tae Gyu

    2014-01-01

    In radio frequency identification (RFID) systems, performance degradation of phase locked loops (PLLs) mainly occurs due to high phase noise of voltage-controlled oscillators (VCOs). This paper proposes a low power, low phase noise ring-VCO developed for 2.42 GHz operated active RFID transponders compatible with IEEE 802.11 b/g, Bluetooth, and Zigbee protocols. For ease of integration and implementation of the module in tiny die area, a novel pseudodifferential delay cell based 3-stage ring oscillator has been introduced to fabricate the ring-VCO. In CMOS technology, 0.18 μm process is adopted for designing the circuit with 1.5 V power supply. The postlayout simulated results show that the proposed oscillator works in the tuning range of 0.5-2.54 GHz and dissipates 2.47 mW of power. It exhibits a phase noise of -126.62 dBc/Hz at 25 MHz offset from 2.42 GHz carrier frequency. PMID:24587731

  8. Token Ring Project

    Directory of Open Access Journals (Sweden)

    Adela Ionescu

    2007-01-01

    Full Text Available Ring topology is a simple configuration used to connect processes that communicate among themselves. A number of network standards such as token ring, token bus, and FDDI are based on the ring connectivity. This article will develop an implementation of a ring of processes that communicate among themselves via pipe links. The processes are nodes in the ring. Each process reads from its standard input and writes in its standard output. N-1 process redirects the its standard output to a standard input of the process through a pipe. When the ring-structure is designed, the project can be extended to simulate networks or to implement algorithms for mutual exclusion

  9. A low-phase-noise ring oscillator with coarse and fine tuning in a standard CMOS process

    International Nuclear Information System (INIS)

    A low-phase-noise wideband ring oscillator with coarse and fine tuning techniques implemented in a standard 65 nm CMOS process is presented. Direct frequency modulation in the ring oscillator is analyzed and a switched capacitor array is introduced to produce the lower VCO gain required to suppress this effect. A two-dimensional high-density stacked MOM-capacitor was adopted as the switched capacitor to make the proposed ring VCO compatible with standard CMOS processes. The designed ring VCO exhibits an output frequency from 480 to 1100 MHz, resulting in a tuning range of 78%, and the measured phase noise is −120 dBc/Hz at 1 MHz at 495 MHz output. The VCO core consumes 3.84 mW under a 1.2 V supply voltage and the corresponding FOM is −169 dBc/Hz. (semiconductor integrated circuits)

  10. A low-phase-noise ring oscillator with coarse and fine tuning in a standard CMOS process

    Institute of Scientific and Technical Information of China (English)

    Gao Haijun; Sun Lingling; Kuang Xiaofei; Lou Liheng

    2012-01-01

    A low-phase-noise wideband ring oscillator with coarse and fine tuning techniques implemented in a standard 65 nm CMOS process is presented.Direct frequency modulation in the ring oscillator is analyzed and a switched capacitor array is introduced to produce the lower VCO gain required to suppress this effect.A two-dimensional high-density stacked MOM-capacitor was adopted as the switched capacitor to make the proposed ring VCO compatible with standard CMOS processes,The designed ring VCO exhibits an output frequency from 480 to 1100 MHz,resulting in a tuning range of 78%,and the measured phase noise is -120 dBc/Hz @ 1 MHz at 495 MHz output.The VCO core consumes 3.84 m W under a 1.2 V supply voltage and the corresponding FOM is 169 dBc/Hz.

  11. Annihilator-semigroup rings

    OpenAIRE

    Anderson, D D; Victor Camillo

    2003-01-01

    Let $ R $ be a commutative ring with 1. We define $ R $ to be an annihilator-semigroup ring if $ R $ has an annihilator-Semigroup $ S $, that is, $ (S, \\cdot) $ is a multiplicative subsemigroup of $ (R, \\cdot) $ with the property that for each $ r \\in R $ there exists a unique $ s \\in S $ with $ 0 : r = 0 : s $. In this paper we investigate annihilator-semigroups and annihilator-semigroup rings.

  12. New evidence for a substellar luminosity problem: Dynamical mass for the brown dwarf binary Gl 417BC

    Energy Technology Data Exchange (ETDEWEB)

    Dupuy, Trent J. [The University of Texas at Austin, Department of Astronomy, 2515 Speedway C1400, Austin, TX 78712 (United States); Liu, Michael C. [Institute for Astronomy, University of Hawai' i, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States); Ireland, Michael J. [Department of Physics and Astronomy, Macquarie University, NSW 2109 (Australia)

    2014-08-01

    We present new evidence for a problem with cooling rates predicted by substellar evolutionary models that implies that model-derived masses in the literature for brown dwarfs and directly imaged planets may be too high. Based on our dynamical mass for Gl 417BC (L4.5+L6) and a gyrochronology system age from its young, solar-type host star, commonly used models predict luminosities 0.2-0.4 dex lower than we observe. This corroborates a similar luminosity-age discrepancy identified in our previous work on the L4+L4 binary HD 130948BC, which coincidentally has nearly identical component masses (≈50-55 M{sub Jup}) and age (≈800 Myr) as Gl 417BC. Such a luminosity offset would cause systematic errors of 15%-25% in model-derived masses at this age. After comparing different models, including cloudless models that should not be appropriate for mid-L dwarfs like Gl 417BC and HD 130948BC but actually match their luminosities better, we speculate the observed overluminosity could be caused by opacity holes (i.e., patchy clouds) in these objects. Moreover, from hybrid substellar evolutionary models that account for cloud disappearance, we infer the corresponding phase of overluminosity may extend from a few hundred million years up to a few gigayears and cause masses to be overestimated by up to 25%, even well after clouds disappear from view entirely. Thus, the range of ages and spectral types affected by this potential systematic shift in luminosity evolution would encompass most known directly imaged gas-giants and field brown dwarfs.

  13. New evidence for a substellar luminosity problem: Dynamical mass for the brown dwarf binary Gl 417BC

    International Nuclear Information System (INIS)

    We present new evidence for a problem with cooling rates predicted by substellar evolutionary models that implies that model-derived masses in the literature for brown dwarfs and directly imaged planets may be too high. Based on our dynamical mass for Gl 417BC (L4.5+L6) and a gyrochronology system age from its young, solar-type host star, commonly used models predict luminosities 0.2-0.4 dex lower than we observe. This corroborates a similar luminosity-age discrepancy identified in our previous work on the L4+L4 binary HD 130948BC, which coincidentally has nearly identical component masses (≈50-55 MJup) and age (≈800 Myr) as Gl 417BC. Such a luminosity offset would cause systematic errors of 15%-25% in model-derived masses at this age. After comparing different models, including cloudless models that should not be appropriate for mid-L dwarfs like Gl 417BC and HD 130948BC but actually match their luminosities better, we speculate the observed overluminosity could be caused by opacity holes (i.e., patchy clouds) in these objects. Moreover, from hybrid substellar evolutionary models that account for cloud disappearance, we infer the corresponding phase of overluminosity may extend from a few hundred million years up to a few gigayears and cause masses to be overestimated by up to 25%, even well after clouds disappear from view entirely. Thus, the range of ages and spectral types affected by this potential systematic shift in luminosity evolution would encompass most known directly imaged gas-giants and field brown dwarfs.

  14. Physics of quantum rings

    Energy Technology Data Exchange (ETDEWEB)

    Fomin, Vladimir M. (ed.) [Leibniz Institute for Solid State and Materials Research, Dresden (Germany)

    2014-07-01

    Presents the new class of materials of quantum rings. Provides an elemental basis for low-cost high-performance devices promising for electronics, optoelectronics, spintronics and quantum information processing. Explains the physical properties of quantum rings to cover a gap in scientific literature. Presents the application of most advanced nanoengineering and nanocharacterization techniques. This book deals with a new class of materials, quantum rings. Innovative recent advances in experimental and theoretical physics of quantum rings are based on the most advanced state-of-the-art fabrication and characterization techniques as well as theoretical methods. The experimental efforts allow to obtain a new class of semiconductor quantum rings formed by capping self-organized quantum dots grown by molecular beam epitaxy. Novel optical and magnetic properties of quantum rings are associated with non-trivial topologies at the nanoscale. An adequate characterization of quantum rings is possible on the basis of modern characterization methods of nanostructures, such as Scanning Tunneling Microscopy. A high level of complexity is demonstrated to be needed for a dedicated theoretical model to adequately represent the specific features of quantum rings. The findings presented in this book contribute to develop low-cost high-performance electronic, spintronic, optoelectronic and information processing devices based on quantum rings.

  15. A Beautiful Ring

    Institute of Scientific and Technical Information of China (English)

    王对成

    2000-01-01

    Helen bought a very nice ring(戒指)and she wore it to the office the next day. Nobody saw her ring. She moved her hand this way and that, but still nobbdy in the offiee saw the ring on her finger. At tea time when they were sitting'round,she suddenly (突然地) stood up. “it is very hot here,”she said. “I think I'll take off my ring.”

  16. Weak Nil Clean Rings

    OpenAIRE

    Basnet, Dhiren Kumar; Bhattacharyya, Jayanta

    2015-01-01

    We introduce the concept of a weak nil clean ring, a generalization of nil clean ring, which is nothing but a ring with unity in which every element can be expressed as sum or difference of a nilpotent and an idempotent. Further if the idempotent and nilpotent commute the ring is called weak* nil clean. We characterize all $n\\in \\mathbb{N}$, for which $\\mathbb{Z}_n$ is weak nil clean but not nil clean. We show that if $R$ is a weak* nil clean and $e$ is an idempotent in $R$, then the corner r...

  17. On -Coherent Endomorphism Rings

    Indian Academy of Sciences (India)

    Li-Xin Mao

    2008-11-01

    A ring is called right -coherent if every principal right ideal is finitely presented. Let $M_R$ be a right -module. We study the -coherence of the endomorphism ring of $M_R$. It is shown that is a right -coherent ring if and only if every endomorphism of $M_R$ has a pseudokernel in add $M_R; S$ is a left -coherent ring if and only if every endomorphism of $M_R$ has a pseudocokernel in add $M_R$. Some applications are given.

  18. Energy and the Economy : BC Hydro Generation Conference Proceedings

    International Nuclear Information System (INIS)

    The participants at this one day conference discussed issues dealing with power generation and concerns in the Pacific Northwest market. The objective was to increase their understanding of resource decisions on the economy, following the lead of the BC Energy Policy development. The conference was divided into the following three sessions: (1) energy market uncertainty and price volatility, (2) merchant versus secured power projects, and (3) generation resources on the margin. A total of 11 papers were presented, of which 5 have been indexed separately for inclusion in the database. tabs., figs

  19. Utjecaj rehidracije na lom zrna kukuruza hibrida Bc 492

    OpenAIRE

    Pliestić, Stjepan

    2002-01-01

    Lom kukuruznog zrna moguće je djelotvorno smanjiti primjenom postupka rehidracije. U ovim istraživanjima primjenjivane su dvije rehidracijske metode: dodavanjem destilirane vode uzorcima kukuruznog zrna vlažnosti 10 %, i miješanjem zrnja kukuruza hibrida Bc 492 dviju vlažnosti 10 i 18 %. Uzorci su rehidrirani, jednom ili drugom metodom, do vlažnosti od 14,5 %. Vrijeme potrebno za kondicioniranje primjenom metode dodavanja vode bilo je oko 16 sati, dok je to vrijeme za metodu miješanjem iznosi...

  20. Technique distribuee de gestion de la charge sur le reseau electrique et ring-tree: Un nouveau systeme de communication P2P

    Science.gov (United States)

    Ayoub, Simon

    Le reseau de distribution et de transport de l'electricite se modernise dans plusieurs pays dont le Canada. La nouvelle generation de ce reseau que l'on appelle smart grid, permet entre autre l'automatisation de la production, de la distribution et de la gestion de la charge chez les clients. D'un autre cote, des appareils domestiques intelligents munis d'une interface de communication pour des applications du smart grid commencent a apparaitre sur le marche. Ces appareils intelligents pourraient creer une communaute virtuelle pour optimiser leurs consommations d'une facon distribuee. La gestion distribuee de ces charges intelligentes necessite la communication entre un grand nombre d'equipements electriques. Ceci represente un defi important a relever surtout si on ne veut pas augmenter le cout de l'infrastructure et de la maintenance. Lors de cette these deux systemes distincts ont ete concus : un systeme de communication peer-to-peer, appele Ring-Tree, permettant la communication entre un nombre important de noeuds (jusqu'a de l'ordre de grandeur du million) tel que des appareils electriques communicants et une technique distribuee de gestion de la charge sur le reseau electrique. Le systeme de communication Ring-Tree inclut une nouvelle topologie reseau qui n'a jamais ete definie ou exploitee auparavant. Il inclut egalement des algorithmes pour la creation, l'exploitation et la maintenance de ce reseau. Il est suffisamment simple pour etre mis en oeuvre sur des controleurs associes aux dispositifs tels que des chauffe-eaux, chauffage a accumulation, bornes de recharges electriques, etc. Il n'utilise pas un serveur centralise (ou tres peu, seulement lorsqu'un noeud veut rejoindre le reseau). Il offre une solution distribuee qui peut etre mise en oeuvre sans deploiement d'une infrastructure autre que les controleurs sur les dispositifs vises. Finalement, un temps de reponse de quelques secondes pour atteindre 1'ensemble du reseau peut etre obtenu, ce qui est

  1. Comparative gene expression analysis among vocal learners (Bengalese finch and budgerigar and non-learners (quail and ring dove reveals variable cadherin expressions in the vocal system

    Directory of Open Access Journals (Sweden)

    Eiji eMatsunaga

    2011-04-01

    Full Text Available Birds use various vocalizations to communicate with one another, and some are acquired through learning. So far, three families of birds (songbirds, parrots, and hummingbirds have been identified as having vocal learning ability. Previously, we found that cadherins, a large family of cell-adhesion molecules, show vocal control-area-related expression in a songbird, the Bengalese finch. To investigate the molecular basis of evolution in avian species, we conducted comparative analysis of cadherin expressions in the vocal and other neural systems among vocal learners (Bengalese finch and budgerigar and a non-learner (quail and ring dove. The gene expression analysis revealed that cadherin expressions were more variable in vocal and auditory areas compared to vocally unrelated areas such as the visual areas among these species. Thus, it appears that such diverse cadherin expressions might have been related to generating species diversity in vocal behavior during the evolution of avian vocal learning. 

  2. Electro-optical hybrid slip ring

    Science.gov (United States)

    Hong, En

    2005-11-01

    The slip ring is a rotary electrical interface, collector, swivel or rotary joint. It is a physical system that can perform continuous data transfer and data exchange between a stationary and a rotating structure. A slip ring is generally used to transfer data or power from an unrestrained, continuously rotating electro-mechanical system in real-time, thereby simplifying operations and eliminating damage-prone wires dangling from moving joints. Slip rings are widely used for testing, evaluating, developing and improving various technical equipment and facilities with rotating parts. They are widely used in industry, especially in manufacturing industries employing turbo machinery, as in aviation, shipbuilding, aerospace, defense, and in precise facilities having rotating parts such as medical Computerized Tomography (CT) and MRI scanners and so forth. Therefore, any improvement in slip ring technology can impact large markets. Research and development in this field will have broad prospects long into the future. The goal in developing the current slip ring technology is to improve and increase the reliability, stability, anti-interference, and high data fidelity between rotating and stationary structures. Up to now, there have been numerous approaches used for signal and data transfer utilizing a slip ring such as metal contacts, wires, radio transmission, and even liquid media. However, all suffer from drawbacks such as data transfer speed limitations, reliability, stability, electro-magnetic interference and durability. The purpose of the current research is to break through these basic limitations using an optical solution, thereby improving performance in current slip ring applications. This dissertation introduces a novel Electro-Optical Hybrid Slip Ring technology, which makes "through the air" digital-optical communication between stationary and rotating systems a reality with high data transfer speed, better reliability and low interference susceptibility

  3. Data quality objectives summary report for the 100-BC-1, 100-BC-2, and 100-DR-1, and 100-DR-2 group 3 waste sites

    International Nuclear Information System (INIS)

    The 100-BC-1, 100-BC-2, 100-DR-1, and 100-DR-2 Group 3 waste sites contain 22 past-practice liquid waste disposal sites and process effluent piping associated with four plutonium-production nuclear reactors that operated from 1944 to 1967. The 100-BC-1, 100-BC-2, 100-DR-1, and 100-DR-2 Group 3 waste sites are the third set of Hanford 100 Area sites to undergo remediation to the extent practicable. Like the sites listed in Groups 1 and 2, the Group 3 sites are considered high-priority because of the contaminants present and their proximity to the Columbia River. Remediation of the 100-BC-1, 100-HR-1 and 100-DR-1 radioactive liquid waste sites is planned to occur in two phases: The first phase, which has been completed, was a demonstration project in the 100-B/C Area to test field techniques and acquire contamination data. The second phase is full-scale remediation of all the reactor areas, starting in the 10-B/C Area, using the field experience gained in the first phase and each subsequent reactor area remediation. This document provides the DQO in support of remediation sampling and analysis at selected sites in the 100-B/C and 100-D Areas

  4. Neel probability and spin correlations in some nonmagnetic and nondegenerate states of the hexanuclear antiferromagnetic ring Fe6: Application of algebraic combinatorics to finite Heisenberg spin systems

    International Nuclear Information System (INIS)

    The spin correlations ωrz, r=1,2,3, and the probability pN of finding a system in the Neel state for the antiferromagnetic ring Fe6III (the so-called 'small ferric wheel') are calculated. States with magnetization M=0 and total spin 0≤S≤15, labeled by two (out of four) one-dimensional irreducible representations (irreps) of the point symmetry group D6, are taken into account. This choice follows from importance of these irreps in analyzing low-lying states in each S multiplet. Taking into account the Clebsch-Gordan coefficients for coupling total spins of sublattices (SA=SB=(15/2)) the global Neel probability pN* can be determined. Dependences of these quantities on state energy (per bond and in the units of exchange integral J) and the total spin S are analyzed. Providing we have determined pN(S), etc., for other antiferromagnetic rings (Fe10, for instance) we could try to approximate results for the largest synthesized ferric wheel Fe18. Since thermodynamic properties of Fe6 have been investigated recently, in the present considerations they are not discussed, but only used to verify obtained values of eigenenergies. Numerical results are calculated with high precision using two main tools: (i) thorough analysis of symmetry properties including methods of algebraic combinatorics and (ii) multiple precision arithmetic library GMP. The system considered yields more than 45 000 basic states (the so-called Ising configurations), but application of the method proposed reduces this problem to 20-dimensional eigenproblem for the ground state (S=0). The largest eigenproblem has to be solved for S=4; its dimension is 60. These two facts (high precision and small resultant eigenproblems) confirm the efficiency and usefulness of such an approach, so it is briefly discussed here

  5. JAERI storage ring JSR

    International Nuclear Information System (INIS)

    A design study for a next generation 8 GeV synchrotron radiation facility is in progress in Japan, and the Japan Atomic Energy Research Institute (JAERI) and Institute of Physical and Chemical Research (RIKEN) have join forces in this project. A compact electron storage ring JSR has been under construction in the linac building in the Tokai Research Establishment of JAERI to serve for studies of various kind of accelerator technologies, examination of insertion devices and beam monitors, and training of young researchers. This paper describes the lattice design, injection system, magnets, vacuum system, RF system, control system and beam monitors and presents some operation results regarding the electron beam injection and storage. The JSR is presently in good condition concerning it's fundamental functions such as injection, storage at around 150 MeV and 300 MeV, and acceleration from 150 MeV and 300 MeV. Photon induced gas desorption is still large because the vacuum chamber has not been aged heavily by synchrotron radiation. (N.K.)

  6. Optical and Infrared Analysis of Type II SN 2006BC

    CERN Document Server

    Gallagher, Joseph S; Clayton, Geoffrey C; Andrews, J E; Clem, J; Barlow, M J; Ercolano, B; Fabbri, J; Otsuka, M; Wesson, R; Meixner, M

    2012-01-01

    We present nebular phase optical imaging and spectroscopy and near/mid-IR imaging of the Type II SN 2006bc. Observations reveal the central wavelength of the symmetric H$\\alpha$ line profile to be red-shifted with respect to the host galaxy H$\\alpha$ emission by day 325. Such an phenomenon has been argued to result from an asymmetric explosion in the iron-peak elements resulting in a larger mass of $^{56}$Ni and higher excitation of hydrogen on the far side of the SN explosion. We also observe a gradual blue-shifting of this H$\\alpha$ peak which is indicative of dust formation in the ejecta. Although showing a normal peak brightness, V $\\sim$ -17.2, for a core-collapse SN, 2006bc fades by $\\sim$6 mag during the first 400 days suggesting either a relatively low $^{56}$Ni yield, an increase in extinction due to new dust, or both. A short duration flattening of the light curve is observed from day 416 to day 541 suggesting an optical light echo. Based on the narrow time window of this echo, we discuss implicatio...

  7. Maintaining BC's hydro endowment for the benefit of consumers

    International Nuclear Information System (INIS)

    This paper outlined the development of electricity market arrangements in British Columbia, as well as options and an approach for endowment. Endowment has been made possible by past provincial investment in hydroelectric facilities on the Peace and Columbia Rivers. The facilities on these rivers have met the electricity needs for BC without adding new generation. The annual value of endowment is estimated at more than $500 million. The challenge is to build and maintain an efficient power sector which keeps the benefits of past decisions while securing appropriate decisions for the future. In the past 2 years, BC has been a net importer and needs new generation and possible transmission capacity, depending on where the new generation will be located. It was emphasized that decisions are needed now in order to avoid shortfalls, particularly with the assumption that the Burrard Thermal power station will be shut down. The development of a wholesale electricity market is key to maintaining the endowment benefit in British Columbia. 3 figs

  8. Theban victory at Haliartos (395 B.C.

    Directory of Open Access Journals (Sweden)

    Pascual, José

    2007-12-01

    Full Text Available This paper reviews the battle of Haliartos (395 B.C. analyzing the strategy of the contendings, both sides contingents and the routes followed by the armies in their way to the battlefield, especially Lysander, who used an inland boiotian route, the route of Koutomoulia and Evangelistria, and camped in the surroundings of modern Mazi about one kilometre to the south of Haliartos, and drew up in battle to a great extent as a Theban ambush.

    Este trabajo examina la batalla de Haliarto (395 B.C. analizando la estrategia de los contendientes, los contingentes que concurrieron en ambos bandos y las rutas que siguieron los diferentes ejércitos hasta el campo de batalla, especialmente Lisandro, que empleó una ruta por el interior de Beocia, la ruta de Koutoumoulia y Evangelistria, y acampó en torno a la actual Mazi, aproximadamente a un kilómetro al sur de Haliarto, y presenta la batalla en gran medida como una emboscada tebana.

  9. Powerex (B.C.) review, October 1991 to September 1992

    International Nuclear Information System (INIS)

    Powerex was established in 1988 as the agency for private-sector development in the long-term firm international electricity trade market, and to market short term electricity products and services using B.C. Hydro's surplus capabilities. Extensive resources were required to renew the provincial and federal authorizations necessary to continue short term electricity trade with Alberta and the U.S. Powerex continues to pursue long term market opportunities for independent power producers in the U.S., with discussions ongoing with Sacramento Municipal Utility District and other U.S. utilities. The 1991-92 year saw significant accomplishments in the areas of electricity trade agreements with customers, with the signing of a number of interconnection and exchange agreements for firm and interruptible energy sales. Extraordinary weather conditions led to challenges and opportunities for B.C. Hydro and Powerex. The year 1991-92 was a record one for Powerex in terms of revenue from electricity trade. 6 figs

  10. First observation of a baryonic $B_c^+$ decay

    CERN Document Server

    Aaij, Roel; Adinolfi, Marco; Affolder, Anthony; Ajaltouni, Ziad; Akar, Simon; Albrecht, Johannes; Alessio, Federico; Alexander, Michael; Ali, Suvayu; Alkhazov, Georgy; Alvarez Cartelle, Paula; Alves Jr, Antonio; Amato, Sandra; Amerio, Silvia; Amhis, Yasmine; An, Liupan; Anderlini, Lucio; Anderson, Jonathan; Andreassen, Rolf; Andreotti, Mirco; Andrews, Jason; Appleby, Robert; Aquines Gutierrez, Osvaldo; Archilli, Flavio; Artamonov, Alexander; Artuso, Marina; Aslanides, Elie; Auriemma, Giulio; Baalouch, Marouen; Bachmann, Sebastian; Back, John; Badalov, Alexey; Baldini, Wander; Barlow, Roger; Barschel, Colin; Barsuk, Sergey; Barter, William; Batozskaya, Varvara; Battista, Vincenzo; Bay, Aurelio; Beaucourt, Leo; Beddow, John; Bedeschi, Franco; Bediaga, Ignacio; Belogurov, Sergey; Belous, Konstantin; Belyaev, Ivan; Ben-Haim, Eli; Bencivenni, Giovanni; Benson, Sean; Benton, Jack; Berezhnoy, Alexander; Bernet, Roland; Bettler, Marc-Olivier; van Beuzekom, Martinus; Bien, Alexander; Bifani, Simone; Bird, Thomas; Bizzeti, Andrea; Bjørnstad, Pål Marius; Blake, Thomas; Blanc, Frédéric; Blouw, Johan; Blusk, Steven; Bocci, Valerio; Bondar, Alexander; Bondar, Nikolay; Bonivento, Walter; Borghi, Silvia; Borgia, Alessandra; Borsato, Martino; Bowcock, Themistocles; Bowen, Espen Eie; Bozzi, Concezio; Brambach, Tobias; van den Brand, Johannes; Bressieux, Joël; Brett, David; Britsch, Markward; Britton, Thomas; Brodzicka, Jolanta; Brook, Nicholas; Brown, Henry; Bursche, Albert; Busetto, Giovanni; Buytaert, Jan; Cadeddu, Sandro; Calabrese, Roberto; Calvi, Marta; Calvo Gomez, Miriam; Campana, Pierluigi; Campora Perez, Daniel; Carbone, Angelo; Carboni, Giovanni; Cardinale, Roberta; Cardini, Alessandro; Carson, Laurence; Carvalho Akiba, Kazuyoshi; Casse, Gianluigi; Cassina, Lorenzo; Castillo Garcia, Lucia; Cattaneo, Marco; Cauet, Christophe; Cenci, Riccardo; Charles, Matthew; Charpentier, Philippe; Chefdeville, Maximilien; Chen, Shanzhen; Cheung, Shu-Faye; Chiapolini, Nicola; Chrzaszcz, Marcin; Ciba, Krzystof; Cid Vidal, Xabier; Ciezarek, Gregory; Clarke, Peter; Clemencic, Marco; Cliff, Harry; Closier, Joel; Coco, Victor; Cogan, Julien; Cogneras, Eric; Cojocariu, Lucian; Collins, Paula; Comerma-Montells, Albert; Contu, Andrea; Cook, Andrew; Coombes, Matthew; Coquereau, Samuel; Corti, Gloria; Corvo, Marco; Counts, Ian; Couturier, Benjamin; Cowan, Greig; Craik, Daniel Charles; Cruz Torres, Melissa Maria; Cunliffe, Samuel; Currie, Robert; D'Ambrosio, Carmelo; Dalseno, Jeremy; David, Pascal; David, Pieter; Davis, Adam; De Bruyn, Kristof; De Capua, Stefano; De Cian, Michel; De Miranda, Jussara; De Paula, Leandro; De Silva, Weeraddana; De Simone, Patrizia; Decamp, Daniel; Deckenhoff, Mirko; Del Buono, Luigi; Déléage, Nicolas; Derkach, Denis; Deschamps, Olivier; Dettori, Francesco; Di Canto, Angelo; Dijkstra, Hans; Donleavy, Stephanie; Dordei, Francesca; Dorigo, Mirco; Dosil Suárez, Alvaro; Dossett, David; Dovbnya, Anatoliy; Dreimanis, Karlis; Dujany, Giulio; Dupertuis, Frederic; Durante, Paolo; Dzhelyadin, Rustem; Dziurda, Agnieszka; Dzyuba, Alexey; Easo, Sajan; Egede, Ulrik; Egorychev, Victor; Eidelman, Semen; Eisenhardt, Stephan; Eitschberger, Ulrich; Ekelhof, Robert; Eklund, Lars; El Rifai, Ibrahim; Elsasser, Christian; Ely, Scott; Esen, Sevda; Evans, Hannah Mary; Evans, Timothy; Falabella, Antonio; Färber, Christian; Farinelli, Chiara; Farley, Nathanael; Farry, Stephen; Fay, Robert; Ferguson, Dianne; Fernandez Albor, Victor; Ferreira Rodrigues, Fernando; Ferro-Luzzi, Massimiliano; Filippov, Sergey; Fiore, Marco; Fiorini, Massimiliano; Firlej, Miroslaw; Fitzpatrick, Conor; Fiutowski, Tomasz; Fontana, Marianna; Fontanelli, Flavio; Forty, Roger; Francisco, Oscar; Frank, Markus; Frei, Christoph; Frosini, Maddalena; Fu, Jinlin; Furfaro, Emiliano; Gallas Torreira, Abraham; Galli, Domenico; Gallorini, Stefano; Gambetta, Silvia; Gandelman, Miriam; Gandini, Paolo; Gao, Yuanning; García Pardiñas, Julián; Garofoli, Justin; Garra Tico, Jordi; Garrido, Lluis; Gaspar, Clara; Gauld, Rhorry; Gavardi, Laura; Gavrilov, Gennadii; Geraci, Angelo; Gersabeck, Evelina; Gersabeck, Marco; Gershon, Timothy; Ghez, Philippe; Gianelle, Alessio; Giani', Sebastiana; Gibson, Valerie; Giubega, Lavinia-Helena; Gligorov, Vladimir; Göbel, Carla; Golubkov, Dmitry; Golutvin, Andrey; Gomes, Alvaro; Gotti, Claudio; Grabalosa Gándara, Marc; Graciani Diaz, Ricardo; Granado Cardoso, Luis Alberto; Graugés, Eugeni; Graziani, Giacomo; Grecu, Alexandru; Greening, Edward; Gregson, Sam; Griffith, Peter; Grillo, Lucia; Grünberg, Oliver; Gui, Bin; Gushchin, Evgeny; Guz, Yury; Gys, Thierry; Hadjivasiliou, Christos; Haefeli, Guido; Haen, Christophe; Haines, Susan; Hall, Samuel; Hamilton, Brian; Hampson, Thomas; Han, Xiaoxue; Hansmann-Menzemer, Stephanie; Harnew, Neville; Harnew, Samuel; Harrison, Jonathan; He, Jibo; Head, Timothy; Heijne, Veerle; Hennessy, Karol; Henrard, Pierre; Henry, Louis; Hernando Morata, Jose Angel; van Herwijnen, Eric; Heß, Miriam; Hicheur, Adlène; Hill, Donal; Hoballah, Mostafa; Hombach, Christoph; Hulsbergen, Wouter; Hunt, Philip; Hussain, Nazim; Hutchcroft, David; Hynds, Daniel; Idzik, Marek; Ilten, Philip; Jacobsson, Richard; Jaeger, Andreas; Jalocha, Pawel; Jans, Eddy; Jaton, Pierre; Jawahery, Abolhassan; Jing, Fanfan; John, Malcolm; Johnson, Daniel; Jones, Christopher; Joram, Christian; Jost, Beat; Jurik, Nathan; Kaballo, Michael; Kandybei, Sergii; Kanso, Walaa; Karacson, Matthias; Karbach, Moritz; Karodia, Sarah; Kelsey, Matthew; Kenyon, Ian; Ketel, Tjeerd; Khanji, Basem; Khurewathanakul, Chitsanu; Klaver, Suzanne; Klimaszewski, Konrad; Kochebina, Olga; Kolpin, Michael; Komarov, Ilya; Koopman, Rose; Koppenburg, Patrick; Korolev, Mikhail; Kozlinskiy, Alexandr; Kravchuk, Leonid; Kreplin, Katharina; Kreps, Michal; Krocker, Georg; Krokovny, Pavel; Kruse, Florian; Kucewicz, Wojciech; Kucharczyk, Marcin; Kudryavtsev, Vasily; Kurek, Krzysztof; Kvaratskheliya, Tengiz; La Thi, Viet Nga; Lacarrere, Daniel; Lafferty, George; Lai, Adriano; Lambert, Dean; Lambert, Robert W; Lanfranchi, Gaia; Langenbruch, Christoph; Langhans, Benedikt; Latham, Thomas; Lazzeroni, Cristina; Le Gac, Renaud; van Leerdam, Jeroen; Lees, Jean-Pierre; Lefèvre, Regis; Leflat, Alexander; Lefrançois, Jacques; Leo, Sabato; Leroy, Olivier; Lesiak, Tadeusz; Leverington, Blake; Li, Yiming; Likhomanenko, Tatiana; Liles, Myfanwy; Lindner, Rolf; Linn, Christian; Lionetto, Federica; Liu, Bo; Lohn, Stefan; Longstaff, Iain; Lopes, Jose; Lopez-March, Neus; Lowdon, Peter; Lu, Haiting; Lucchesi, Donatella; Luo, Haofei; Lupato, Anna; Luppi, Eleonora; Lupton, Oliver; Machefert, Frederic; Machikhiliyan, Irina V; Maciuc, Florin; Maev, Oleg; Malde, Sneha; Malinin, Alexander; Manca, Giulia; Mancinelli, Giampiero; Maratas, Jan; Marchand, Jean François; Marconi, Umberto; Marin Benito, Carla; Marino, Pietro; Märki, Raphael; Marks, Jörg; Martellotti, Giuseppe; Martens, Aurelien; Martín Sánchez, Alexandra; Martinelli, Maurizio; Martinez Santos, Diego; Martinez Vidal, Fernando; Martins Tostes, Danielle; Massafferri, André; Matev, Rosen; Mathe, Zoltan; Matteuzzi, Clara; Mazurov, Alexander; McCann, Michael; McCarthy, James; McNab, Andrew; McNulty, Ronan; McSkelly, Ben; Meadows, Brian; Meier, Frank; Meissner, Marco; Merk, Marcel; Milanes, Diego Alejandro; Minard, Marie-Noelle; Moggi, Niccolò; Molina Rodriguez, Josue; Monteil, Stephane; Morandin, Mauro; Morawski, Piotr; Mordà, Alessandro; Morello, Michael Joseph; Moron, Jakub; Morris, Adam Benjamin; Mountain, Raymond; Muheim, Franz; Müller, Katharina; Mussini, Manuel; Muster, Bastien; Naik, Paras; Nakada, Tatsuya; Nandakumar, Raja; Nasteva, Irina; Needham, Matthew; Neri, Nicola; Neubert, Sebastian; Neufeld, Niko; Neuner, Max; Nguyen, Anh Duc; Nguyen, Thi-Dung; Nguyen-Mau, Chung; Nicol, Michelle; Niess, Valentin; Niet, Ramon; Nikitin, Nikolay; Nikodem, Thomas; Novoselov, Alexey; O'Hanlon, Daniel Patrick; Oblakowska-Mucha, Agnieszka; Obraztsov, Vladimir; Oggero, Serena; Ogilvy, Stephen; Okhrimenko, Oleksandr; Oldeman, Rudolf; Onderwater, Gerco; Orlandea, Marius; Otalora Goicochea, Juan Martin; Owen, Patrick; Oyanguren, Maria Arantza; Pal, Bilas Kanti; Palano, Antimo; Palombo, Fernando; Palutan, Matteo; Panman, Jacob; Papanestis, Antonios; Pappagallo, Marco; Pappalardo, Luciano; Parkes, Christopher; Parkinson, Christopher John; Passaleva, Giovanni; Patel, Girish; Patel, Mitesh; Patrignani, Claudia; Pazos Alvarez, Antonio; Pearce, Alex; Pellegrino, Antonio; Pepe Altarelli, Monica; Perazzini, Stefano; Perez Trigo, Eliseo; Perret, Pascal; Perrin-Terrin, Mathieu; Pescatore, Luca; Pesen, Erhan; Petridis, Konstantin; Petrolini, Alessandro; Picatoste Olloqui, Eduardo; Pietrzyk, Boleslaw; Pilař, Tomas; Pinci, Davide; Pistone, Alessandro; Playfer, Stephen; Plo Casasus, Maximo; Polci, Francesco; Poluektov, Anton; Polycarpo, Erica; Popov, Alexander; Popov, Dmitry; Popovici, Bogdan; Potterat, Cédric; Price, Eugenia; Prisciandaro, Jessica; Pritchard, Adrian; Prouve, Claire; Pugatch, Valery; Puig Navarro, Albert; Punzi, Giovanni; Qian, Wenbin; Rachwal, Bartolomiej; Rademacker, Jonas; Rakotomiaramanana, Barinjaka; Rama, Matteo; Rangel, Murilo; Raniuk, Iurii; Rauschmayr, Nathalie; Raven, Gerhard; Reichert, Stefanie; Reid, Matthew; dos Reis, Alberto; Ricciardi, Stefania; Richards, Sophie; Rihl, Mariana; Rinnert, Kurt; Rives Molina, Vincente; Roa Romero, Diego; Robbe, Patrick; Rodrigues, Ana Barbara; Rodrigues, Eduardo; Rodriguez Perez, Pablo; Roiser, Stefan; Romanovsky, Vladimir; Romero Vidal, Antonio; Rotondo, Marcello; Rouvinet, Julien; Ruf, Thomas; Ruiz, Hugo; Ruiz Valls, Pablo; Saborido Silva, Juan Jose; Sagidova, Naylya; Sail, Paul; Saitta, Biagio; Salustino Guimaraes, Valdir; Sanchez Mayordomo, Carlos; Sanmartin Sedes, Brais; Santacesaria, Roberta; Santamarina Rios, Cibran; Santovetti, Emanuele; Sarti, Alessio; Satriano, Celestina; Satta, Alessia; Saunders, Daniel Martin; Savrie, Mauro; Savrina, Darya; Schiller, Manuel; Schindler, Heinrich; Schlupp, Maximilian; Schmelling, Michael; Schmidt, Burkhard; Schneider, Olivier; Schopper, Andreas; Schune, Marie Helene; Schwemmer, Rainer; Sciascia, Barbara; Sciubba, Adalberto; Seco, Marcos; Semennikov, Alexander; Sepp, Indrek; Serra, Nicola; Serrano, Justine; Sestini, Lorenzo; Seyfert, Paul; Shapkin, Mikhail; Shapoval, Illya; Shcheglov, Yury; Shears, Tara; Shekhtman, Lev; Shevchenko, Vladimir; Shires, Alexander; Silva Coutinho, Rafael; Simi, Gabriele; Sirendi, Marek; Skidmore, Nicola; Skwarnicki, Tomasz; Smith, Anthony; Smith, Edmund; Smith, Eluned; Smith, Jackson; Smith, Mark; Snoek, Hella; Sokoloff, Michael; Soler, Paul; Soomro, Fatima; Souza, Daniel; Souza De Paula, Bruno; Spaan, Bernhard; Sparkes, Ailsa; Spradlin, Patrick; Sridharan, Srikanth; Stagni, Federico; Stahl, Marian; Stahl, Sascha; Steinkamp, Olaf; Stenyakin, Oleg; Stevenson, Scott; Stoica, Sabin; Stone, Sheldon; Storaci, Barbara; Stracka, Simone; Straticiuc, Mihai; Straumann, Ulrich; Stroili, Roberto; Subbiah, Vijay Kartik; Sun, Liang; Sutcliffe, William; Swientek, Krzysztof; Swientek, Stefan; Syropoulos, Vasileios; Szczekowski, Marek; Szczypka, Paul; Szilard, Daniela; Szumlak, Tomasz; T'Jampens, Stephane; Teklishyn, Maksym; Tellarini, Giulia; Teubert, Frederic; Thomas, Christopher; Thomas, Eric; van Tilburg, Jeroen; Tisserand, Vincent; Tobin, Mark; Tolk, Siim; Tomassetti, Luca; Tonelli, Diego; Topp-Joergensen, Stig; Torr, Nicholas; Tournefier, Edwige; Tourneur, Stephane; Tran, Minh Tâm; Tresch, Marco; Tsaregorodtsev, Andrei; Tsopelas, Panagiotis; Tuning, Niels; Ubeda Garcia, Mario; Ukleja, Artur; Ustyuzhanin, Andrey; Uwer, Ulrich; Vagnoni, Vincenzo; Valenti, Giovanni; Vallier, Alexis; Vazquez Gomez, Ricardo; Vazquez Regueiro, Pablo; Vázquez Sierra, Carlos; Vecchi, Stefania; Velthuis, Jaap; Veltri, Michele; Veneziano, Giovanni; Vesterinen, Mika; Viaud, Benoit; Vieira, Daniel; Vieites Diaz, Maria; Vilasis-Cardona, Xavier; Vollhardt, Achim; Volyanskyy, Dmytro; Voong, David; Vorobyev, Alexey; Vorobyev, Vitaly; Voß, Christian; Voss, Helge; de Vries, Jacco; Waldi, Roland; Wallace, Charlotte; Wallace, Ronan; Walsh, John; Wandernoth, Sebastian; Wang, Jianchun; Ward, David; Watson, Nigel; Websdale, David; Whitehead, Mark; Wicht, Jean; Wiedner, Dirk; Wilkinson, Guy; Williams, Matthew; Williams, Mike; Wilson, Fergus; Wimberley, Jack; Wishahi, Julian; Wislicki, Wojciech; Witek, Mariusz; Wormser, Guy; Wotton, Stephen; Wright, Simon; Wu, Suzhi; Wyllie, Kenneth; Xie, Yuehong; Xing, Zhou; Xu, Zhirui; Yang, Zhenwei; Yuan, Xuhao; Yushchenko, Oleg; Zangoli, Maria; Zavertyaev, Mikhail; Zhang, Liming; Zhang, Wen Chao; Zhang, Yanxi; Zhelezov, Alexey; Zhokhov, Anatoly; Zhong, Liang; Zvyagin, Alexander

    2014-01-01

    A baryonic decay of the $B_c^+$ meson, $B_c^+\\to J/\\psi p\\overline{p}\\pi^+$, is observed for the first time, with a significance of $7.3$ standard deviations, in $pp$ collision data collected with the LHCb detector and corresponding to an integrated luminosity of $3.0$ fb$^{-1}$ taken at center-of-mass energies of $7$ and $8$ $\\mathrm{TeV}$. With the $B_c^+\\to J/\\psi \\pi^+$ decay as normalization channel, the ratio of branching fractions is measured to be \\begin{equation*} \\frac{\\mathcal{B}(B_c^+\\to J/\\psi p\\overline{p}\\pi^+)}{\\mathcal{B}(B_c^+\\to J/\\psi \\pi^+)} = 0.143^{\\,+\\,0.039}_{\\,-\\,0.034}\\,(\\mathrm{stat})\\pm0.013\\,(\\mathrm{syst}). \\end{equation*} The mass of the $B_c^+$ meson is determined as $M(B_c^+)=6274.0\\pm1.8\\,(\\mathrm{stat})\\pm0.4\\,(\\mathrm{syst})\\,\\mathrm{MeV}/c^2$, using the $B_c^+\\to J/\\psi p\\overline{p}\\pi^+$ channel.

  11. Design of a loop resonator with a split-ring-resonator (SRR) for a human-body coil in 3 T MRI systems

    Science.gov (United States)

    Son, Hyeok Woo; Cho, Young Ki; Kim, Byung Mun; Back, Hyun Man; Yoo, Hyoungsuk

    2016-04-01

    A new radio-frequency (RF) resonator for Nuclear Magnetic Resonance (NMR) imaging at clinical magnetic resonance imaging (MRI) systems is proposed in this paper. An approach based on the effects of the properties of metamaterials in split-ring resonators (SRRs) is used to design a new loop resonator with a SRR for NMR imaging. This loop resonator with a SRR is designed for NMR imaging at 3 T MRI systems. The 3D electromagnetic simulation was used to optimize the design of the proposed RF resonator and analyze it's performance at 3 T MRI systems. The proposed RF resonator provides strong penetrating magnetic fields at the center of the human phantom model, approximately 10%, as compared to the traditional loop-type RF resonator used for NMR imaging at clinical MRI systems. We also designed an 8-channel body coil for human-body NMR imaging by using the proposed loop resonator with a SRR. This body coil also produces more homogeneous and highly penetrating magnetic fields into the human phantom model.

  12. EBT ring physics

    International Nuclear Information System (INIS)

    This workshop attempted to evaluate the status of the current experimental and theoretical understanding of hot electron ring properties. The dominant physical processes that influence ring formation, scaling, and their optimal behavior are also studied. Separate abstracts were prepared for each of the 27 included papers

  13. EBT ring physics

    Energy Technology Data Exchange (ETDEWEB)

    Uckan, N.A. (ed.)

    1980-04-01

    This workshop attempted to evaluate the status of the current experimental and theoretical understanding of hot electron ring properties. The dominant physical processes that influence ring formation, scaling, and their optimal behavior are also studied. Separate abstracts were prepared for each of the 27 included papers. (MOW)

  14. Smoke Ring Physics

    Science.gov (United States)

    Huggins, Elisha

    2011-01-01

    The behavior of smoke rings, tornados, and quantized vortex rings in superfluid helium has many features in common. These features can be described by the same mathematics we use when introducing Ampere's law in an introductory physics course. We discuss these common features. (Contains 7 figures.)

  15. On valuation rings

    OpenAIRE

    Kabbour, Mohammed; Mahdou, Najib

    2009-01-01

    In this paper we provide necessary and sufficient conditions for $ R=A\\propto E $ to be a valuation ring where $E$ is a non-torsion or finitely generated $A-$module. Also, we investigate the $ (n,d) $ property of the valuation ring.

  16. The Fermilab recycler ring

    Energy Technology Data Exchange (ETDEWEB)

    Martin Hu

    2001-07-24

    The Fermilab Recycler is a permanent magnet storage ring for the accumulation of antiprotons from the Antiproton Source, and the recovery and cooling of the antiprotons remaining at the end of a Tevatron store. It is an integral part of the Fermilab III luminosity upgrade. The following paper describes the design features, operational and commissioning status of the Recycler Ring.

  17. Radiation from structured-ring resonators

    CERN Document Server

    Maling, B; Craster, R V

    2016-01-01

    We investigate the scalar-wave resonances of systems composed of identical Neumann-type inclusions arranged periodically around a circular ring. Drawing on natural similarities with the undamped Rayleigh-Bloch waves supported by infinite linear arrays, we deduce asymptotically the exponentially small radiative damping in the limit where the ring radius is large relative to the periodicity. In our asymptotic approach, locally linear Rayleigh-Bloch waves that attenuate exponentially away from the ring are matched to a ring-scale WKB-type wave field. The latter provides a descriptive physical picture of how the mode energy is transferred via tunnelling to a circular evanescent-to-propagating transition region a finite distance away from the ring, from where radiative grazing rays emanate to the far field. Excluding the zeroth-order standing-wave modes, the position of the transition circle bifurcates with respect to clockwise and anti-clockwise contributions, resulting in striking spiral wavefronts.

  18. Infrared observations of the Uranian rings

    Science.gov (United States)

    Nicholson, P. D.; Jones, T. J.; Matthews, K.

    1982-01-01

    Maps of the Uranian rings at 2.2 microns and spectrophotometric observations covering 2.0 to 2.4 and 2.9 to 3.9 microns are discussed. The maps reveal a 2:1 azimuthal brightness variation whose amplitude and phase are consistent with the width variation and apsidal precession of the epsilon ring. Comparison with models based on stellar occultation data leads to an upper limit of 0.01 on the normal optical depth of any broad (5000 km wide), diffuse component of the ring system. A significant east-west asymmetry, corresponding to a brightening of the near side of the rings relative to the far side, is unexplained. The spectrum of the rings is flat over the range 2.1 to 3.9 microns. There is no spectroscopic evidence for the presence of H2O.

  19. Jupiter's Rings: Sharpest View

    Science.gov (United States)

    2007-01-01

    The New Horizons spacecraft took the best images of Jupiter's charcoal-black rings as it approached and then looked back at Jupiter. The top image was taken on approach, showing three well-defined lanes of gravel- to boulder-sized material composing the bulk of the rings, as well as lesser amounts of material between the rings. New Horizons snapped the lower image after it had passed Jupiter on February 28, 2007, and looked back in a direction toward the sun. The image is sharply focused, though it appears fuzzy due to the cloud of dust-sized particles enveloping the rings. The dust is brightly illuminated in the same way the dust on a dirty windshield lights up when you drive toward a 'low' sun. The narrow rings are confined in their orbits by small 'shepherding' moons.

  20. Proton storage ring: man/machine interface

    International Nuclear Information System (INIS)

    The human interface of the Proton Storage Ring Control System at Los Alamos is described in some detail, together with the software environment in which operator interaction programs are written. Some examples of operator interaction programs are given

  1. National synchrotron light source VUV storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Blumberg, L.; Bittner, J.; Galayda, J.; Heese, R.; Krinsky, S.; Schuchman, J.; van Steenbergen, A.

    1979-01-01

    A 700 MeV electron storage ring designed for synchrotron radiation applications is described. Lattice and stability calculations are presented and the vacuum, correction and injection systems are discussed.

  2. Nil-clean matrix rings

    OpenAIRE

    S. Breaz; Călugăreanu, G.; Danchev, P.; Micu, T.

    2013-01-01

    We characterize the nil clean matrix rings over fields. As a by product, it is proved that the full matrix rings with coefficients in commutative nil-clean rings are nil-clean, and we obtain a complete characterization of the finite rank Abelian groups with nil clean endomorphism ring and the Abelian groups with strongly nil clean endomorphism ring, respectively.

  3. Prometheus Induced Vorticity In Saturns F Ring

    CERN Document Server

    Sutton, Phil J

    2016-01-01

    Saturns rings are known to show remarkable real time variability in their structure. Many of which can be associated to interactions with nearby moons and moonlets. Possibly the most interesting and dynamic place in the rings, probably in the whole Solar System, is the F ring. A highly disrupted ring with large asymmetries both radially and azimuthally. Numerically non zero components to the curl of the velocity vector field (vorticity) in the perturbed area of the F ring post encounter are witnessed, significantly above the background vorticity. Within the perturbed area rich distributions of local rotations is seen located in and around the channel edges. The gravitational scattering of ring particles during the encounter causes a significant elevated curl of the vector field above the background F ring vorticity for the first 1-3 orbital periods post encounter. After 3 orbital periods vorticity reverts quite quickly to near background levels. This new found dynamical vortex life of the ring will be of grea...

  4. Minimum amount of extracting solvent of AB/BC countercurrent extraction separation using organic feed

    Institute of Scientific and Technical Information of China (English)

    程福祥; 吴声; 张玻; 刘艳; 王嵩龄; 廖春生; 严纯华

    2014-01-01

    For an AB/BC countercurrent extraction separation using organic feed, the conditions to have minimum amount of ex-tracting solvent (Smin) and minimum amount of scrubbing agent solution (Wmin) were discussed, and the formulae of bothSmin and Wmin were deduced. It was shown that only when the ratio of flowrate of central component B leaving aqueous outlet to that leaving organic outlet took a certain optimal value, the AB/BC separation could have Smin as well asWmin, and this optimal ratio was decided by the separation factors between the three components but independent of feed composition.Smin was only relative to the separation factor of A/C pair but regardless of the separation factors of other pairs as well as feed composition, whereasWmin was determined by the separation factors between the components together with feed composition. Meanwhile it was also found that the organic stream out of feed stage was same composition as the initial organic feed when the separation system was given by the two minimum amounts and its steady state was achieved. Finally the results above were used to design a LuYb/YbTm separation case and the stage-wise compositions of each component in both the organic and the aqueous phase at steady state were given by computer simulation.

  5. Release of arachidonic acid from oligodendrocytes by terminal complement proteins, C5b-C9

    International Nuclear Information System (INIS)

    Activation of C5b-C9 on monocytes, macrophages, platelets and neutrophils induces membrane lipid hydrolysis and generates arachidonic acid (AA) and its oxygenated derivatives. Additionally, activation of C5b-C9 and myelin lipid hydrolysis has been observed in demyelination. The authors have investigated the modulatory effect of C5b-9 on membrane lipid hydrolysis of oligodendrocytes (OLG), the myelin producing cells in the central nervous system. Antibody-sensitized rat OLG, prelabeled with 14C AA were treated with excess C6-deficient rabbit serum reconstituted with limiting doses of C6. Qualitative analysis of the supernatants by HPLC revealed the presence of both cyclooxygenase and lipooxygenase products. Prostaglandin E2, leukotriene (LT) E4, LTB4 and free AA were the major radiolabeled products. The kinetics and dose response of LTB4 release with respect to the cytolytic dose of C5b-9 were quantitated by radioimmunoassay. LTB4 release approached maximum in 1 hr and higher amounts were detected with fewer C5b-9 channels. Addition of C8 to OLG bearing C5b-7 intermediates induced maximum LTB4 release without further enhancement by C9 in contrast to the absolute requirement of C9 in mediator release from rat neutrophils. Thus, the requirement of C5b-8 or C5b-9 in mediator release appears to be cell-type dependent

  6. Characterization of a novel toxin-antitoxin module, VapBC, encoded by Leptospira interrogans chromosome

    Institute of Scientific and Technical Information of China (English)

    Yi Xuan ZHANG; Xiao Kui GUO; Chuan WU; Bo BI; Shuang Xi REN; Chun Fu WU; Guo Ping ZHAO

    2004-01-01

    Comparative genomic analysis of the coding sequences (CDSs) of Leptospira interrogans revealed a pair of closely linked genes homologous to the vapBC loci of many other bacteria with respect to both deduced amino acid sequences and operon organizations. Expression of single vapC gene in Escherichia coli resulted in inhibition of bacterial growth,whereas co-expression of vapBC restored the growth effectively. This phenotype is typical for three other characterized toxin-antitoxin systems of bacteria, i.e., mazEF[1], relBE[2] and chpIK[3]. The VapC proteins of bacteria and a thermophilic archeae, Solfolobus tokodaii, form a structurally distinguished group of toxin different from the other known toxins of bacteria. Phylogenetic analysis of both toxins and antitoxins of all categories indicated that although toxins were evolved from divergent sources and may or may not follow their speciation paths (as indicated by their 16s RNA sequences), co-evolution with their antitoxins was obvious.

  7. Production of Charmed Tetraquarks from $B_c$ and $B$ decays

    CERN Document Server

    He, Xiao-Gang; Zhu, Rui-Lin

    2016-01-01

    Hadronic states composed of multi-quark flavors may exist in reality since they are not prohibited by QCD. Compact four quark systems of color singlet are classified as tetraquarks. To understand the properties of these states, more theoretical and experimental efforts are needed. In this work, we study charmed tetraquarks with three light flavors using flavor $SU(3)$ symmetry. States with three different light quarks must be in a ${\\bf \\bar 6 }$ or a ${\\bf 15}$ multiplet. We investigate the production of charmed tetraquarks $X_c$ in $B\\to X_c (\\overline {X}_c) P$ and $B_c \\to X_c P$ decays. Whether the states with three light quarks belong to ${\\bf \\bar 6}$ or ${\\bf 15}$ can be determined by studying various tetraquark $B$ and $B_c$ decays. We demonstrate that the decay amplitudes for these decays can be parametrized by a few irreducible SU(3) invariant amplitudes. We then derive relations for decay widths and CP violating rate difference which can be examined experimentally. Although no experimental measure...

  8. Characterization of a novel toxin-antitoxin module, VapBC, encoded by Leptospira interrogans chromosome.

    Science.gov (United States)

    Zhang, Yi Xuan; Li, Juan; Guo, Xiao Kui; Wu, Chuan; Bi, Bo; Ren, Shuang Xi; Wu, Chun Fu; Zhao, Guo Ping

    2004-06-01

    Comparative genomic analysis of the coding sequences (CDSs) of Leptospira interrogans revealed a pair of closely linked genes homologous to the vapBC loci of many other bacteria with respect to both deduced amino acid sequences and operon organizations. Expression of single vapC gene in Escherichia coli resulted in inhibition of bacterial growth, whereas co-expression of vapBC restored the growth effectively. This phenotype is typical for three other characterized toxin-antitoxin systems of bacteria, i.e., mazEF, relBE and chpIK. The VapC proteins of bacteria and a thermophilic archeae, Solfolobus tokodaii, form a structurally distinguished group of toxin different from the other known toxins of bacteria. Phylogenetic analysis of both toxins and antitoxins of all categories indicated that although toxins were evolved from divergent sources and may or may not follow their speciation paths (as indicated by their 16s RNA sequences), co-evolution with their antitoxins was obvious. PMID:15225414

  9. Hochschild and ordinary cohomology rings of small categories

    OpenAIRE

    Xu, Fei

    2008-01-01

    Advances in Mathematics, accepted Let C be a small category and k a field. There are two interesting mathematical subjects: the category algebra kC and the classifying space |C|=BC. We study the ring homomorphism HH^*(kC) ---> H^*(|C|,k) and prove it is split surjective, using the factorization category of Quillen and certain techniques from functor cohomology theory. This generalizes the well-known theorems for groups and posets. Based on this result, we construct a seven-dimensional cate...

  10. Study of atomic and molecular oxygen chemisorption on BC3 nanotubes with Stone–Wales defects using density functional theory

    International Nuclear Information System (INIS)

    Highlights: • Atomic and molecular oxygen adsorption on BC3 nanotubes is studied by DFT methods. • Perfect BC3 nanotubes and four types of Stone-Wales defects are considered. • Adsorption of O is always exothermic, but for O2 it is sometimes endothermic. • Molecular oxygen is chemisorbed and produces spin-singlet states. • O2 adsorption on SW-CC-c system results in a half-metallic antiferromagnet. - Abstract: Density functional theory calculations are used to study the adsorption of chemical species including oxygen atom and oxygen molecule on the perfect and defective BC3 nanotubes. Stone–Wales topological defects with four different bond rotations have been examined. The adsorption of atomic oxygen is exothermic in all cases, while for the molecular oxygen, some sites showed endothermic adsorption. Comparative studies on the adsorption of these chemical species shows the maintenance of semiconductive behavior of nanotubes, except for one of the systems, the defected nanotube with a circumferential C–C bond rotation. In this system, the adsorption of molecular oxygen generates a half-metallic antiferromagnet. The results obtained in this paper are relevant for chemical sensing and spintronics applications

  11. Strong coupling constant of hb vector to the pseudoscalar and vector Bc mesons in QCD sum rules

    International Nuclear Information System (INIS)

    The strong coupling constant ghbBcPSBcV is calculated using the three-point QCD sum-rule method. We use correlation functions to obtain these strong coupling constants with contributions of both BcPS and BcV mesons as off-shell states. The contributions of two gluon condensates as a radiative correction are considered. The results show that ghbBcPSBcV = 8.80 ± 2.84 GeV-1 and ghbBcPSBcV = 9.34 ± 3.12 GeV-1 in the BcPS and BcV off-shell state, respectively. (orig.)

  12. Tunable electronic properties induced by a defect-substrate in graphene/BC3 heterobilayers.

    Science.gov (United States)

    Li, Sheng-shi; Zhang, Chang-wen; Ji, Wei-xiao; Li, Feng; Wang, Pei-ji

    2014-11-01

    We perform first-principles calculations to study the geometric, energetics and electronic properties of graphene supported on BC3 monolayer. The results show that overall graphene interacts weakly with BC3 monolayer via van der Waals interaction. The energy gap of graphene can be up to ∼0.162 eV in graphene/BC3 heterobilayers (G/BC3 HBLs), which is large enough for the gap opening at room temperature. We also find that the interlayer spacing and in-plane strain can tune the band gap of G/BC3 HBLs effectively. Interestingly, the characteristics of a Dirac cone with a nearly linear band dispersion relationship of graphene can be preserved, accompanied by a small electron effective mass, and thus the higher carrier mobility is still expected. These findings provide a possible way to design effective FETs out of graphene on a BC3 substrate. PMID:25241677

  13. Fragile X mental retardation protein (FMRP) binds specifically to the brain cytoplasmic RNAs BC1/BC200 via a novel RNA-binding motif

    OpenAIRE

    Zalfa, F.; S. Adinolfi; Napoli, I; Kuhn-Holsken, E; Urlaub, H.; Achsel, Tilmann; Pastore, A; Bagni, Claudia

    2005-01-01

    Fragile X mental retardation protein (FMRP), the protein responsible for the fragile X syndrome, is an RNA-binding protein involved in localization and translation of neuronal mRNAs. One of the RNAs known to interact with FMRP is the dendritic non-translatable brain cytoplasmic RNA 1 BC1 RNA that works as an adaptor molecule linking FMRP and some of its regulated mRNAs. Here, we showed that the N terminus of FMRP binds strongly and specifically to BC1 and to its potential human analog BC200. ...

  14. Hadron Spectroscopy, exotics and $B_c^+$ physics at LHCb

    CERN Document Server

    Dey, Biplab

    2016-01-01

    The LHCb experiment is designed to study properties and decays of heavy flavored hadrons produced from $pp$ collisions at the LHC. During Run~1, it has recorded the world's largest data sample of beauty and charm hadrons, enabling precision spectroscopy studies of such particles. Several important results obtained by LHCb, such as the discovery of the first pentaquark states and the first unambiguous determination of the $Z_c(4430)^-$ as an exotic state, have dramatically increased the interest on spectroscopy of heavy hadrons. An overview of the latest LHCb results on the subject, including the discovery of four strange exotic states decaying as $X \\to J/\\psi \\phi$, is presented. LHCb has also made significant contributions to the field of $B_c^+$ physics, the lowest bound state of the heavy flavor $\\bar{b}$ and $c$ quarks. A synopsis of the the latest results is given.

  15. Alternative surfacing materials for weed control at BC Hydro substations

    International Nuclear Information System (INIS)

    A two year study was conducted by BC Hydro in which a variety of surfacing materials were tested for their suitability for use in substations. Ideally, surfacing materials should have the following characteristics: high electrical resistivity in both dry and wet conditions, resistance to invasion by weeds, good driveability, good drainage, non-flammable, reasonably priced, no dust to foul conductors, and be aesthetically pleasing. Trials at Vernon Koksilah, and Ingledow substations were conducted to test the materials. A qualitative estimate of the amount of weed control provided by each material was recorded. The trials were meant to provide operational recommendations and screening information to allow for future testing of promising materials or combination of materials. Results showed that no single material meets all the desired criteria. The surfaces that best combined good weed control, electrical resistance and surface stability was a 15 cm deep layer of crushed gravel, especially if underlain by a layer of geotextile. 4 refs., 3 tabs., 1 fig

  16. Gamma radiation effects on the cuban antimeningococcic BC vaccine

    International Nuclear Information System (INIS)

    The effects of gamma rays on the Cuban antimeningococcic BC vaccine properties were studied. These were performanced by simulation with different bio burden of microbial pollutants. The isolated spores of the pollutants of non- aseptic areas were used. Its D10 was determined as 2.045 Gy. On that basis, the sterilization dose setting was performed. The quality of the irradiated vaccine was performed according to the Cuban standards: sterility, protein and polysaccharide concentration, immunogenicity, per cent of protein adsorption, nonspecific innocuousness. There were observed non negative effects on the vaccine of the radiation process in the dose range of 0-25 Gy. It was also studied the preservation of the properties of the irradiated vaccine, by storing it during one year at four celsius grade. The results were satisfactory

  17. CASSINI UVIS STELLAR OCCULTATION OBSERVATIONS OF SATURN's RINGS

    International Nuclear Information System (INIS)

    The Cassini spacecraft's Ultraviolet Imaging Spectrograph (UVIS) includes a high-speed photometer (HSP) that has observed more than 100 stellar occultations by Saturn's rings. Here, we document a standardized technique applied to the UVIS-HSP ring occultation datasets delivered to the Planetary Data System as higher level data products. These observations provide measurements of ring structure that approaches the scale of the largest common ring particles (∼5 m). The combination of multiple occultations at different viewing geometries enables reconstruction of the three-dimensional structure of the rings. This inversion of the occultation data depends on accurate calibration of the data so that occultations of different stars taken at different times and under different viewing conditions can be combined to retrieve ring structure. We provide examples of the structure of the rings as seen from several occultations at different incidence angles to the rings, illustrating changes in the apparent structure with viewing geometry.

  18. Saturn's Rings are Fractal

    OpenAIRE

    Li, Jun; Ostoja-Starzewski, Martin

    2012-01-01

    Over the past few decades, various conjectures were advanced that Saturn's rings are Cantor-like sets, although no convincing fractal analysis of actual images has ever appeared. We focus on the images sent by the Cassini spacecraft mission: slide #42 "Mapping Clumps in Saturn's Rings" and slide #54 "Scattered Sunshine". Using the box-counting method, we determine the fractal dimension of rings seen here (and in several other images from the same source) to be consistently about 1.6~1.7. This...

  19. Expression of an Antisense BcMF3 Affects Microsporogenesis and Pollen Tube Growth in Arabidopsis

    Institute of Scientific and Technical Information of China (English)

    LIU Le-cheng; CAO Jia-shu; YU Xiao-lin; XIANG Xun; FEI Yong-jun

    2006-01-01

    In an effort to provide some information relevant to the molecular mechanism of genic male sterility in plants, BcMF3 gene that encodes a pectin methylesterase was isolated from the fertile B line of Chinese cabbage-pak-choi (Brassica rapa ssp.chinensis, syn. B. campestris ssp. chinensis). In the present paper, a 455-bp antisense cDNA fragment of BcMF3 was introduced to binary vector pBI121, and then was mobilized into Agrobacterium tumefaciens strain LBA4404. The A.tumefaciens harboring the BcMF3 antisense fragment was transformed to Arabidopsis thaliana by floral dip. Scanning electronic microscopy examination demonstrated that 47.8% of BcMF3 antisense pollen grains exhibited abnormal shape,which might lead to decreased germination of pollens, suggesting that the product of BcMF3 gene plays an important role during microsporogenesis. The evidence on burst of 45.7% of BcMF3 antisense pollen tubes in vitro and a majority of BcMF3 antisense pollens restricted within the stigmatic tissue revealed that BcMF3 is involved in aiding the growth of pollen tubes. The results suggest that BcMF3 acts at both stages of microsporogensis and pollen tube growth.

  20. Characterization of genes involved in biosynthesis of a novel antibiotic from Burkholderia cepacia BC11 and their role in biological control of Rhizoctonia solani

    Energy Technology Data Exchange (ETDEWEB)

    Kang, Y.; Carlson, R.; Tharpe, W.; Schell, M.A. [Univ. of Georgia, Athens, GA (United States)

    1998-10-01

    Genetic manipulation of fluorescent pseudomonads has provided major insight into their production of antifungal molecules and their role in biological control of plant disease. Burkholderia cepacia also produces antifungal activities, but its biological control activity is much less well characterized, in part due to difficulties in applying genetic tools. Here the authors report genetic and biochemical characterization of a soil isolate of B. cepacia relating to its production of an unusual antibiotic that is very active against a variety of soil fungi. Purification and preliminary structural analyses suggest that this antibiotic (called AFC-BC11) is a novel lipopeptide associated largely with the cell membrane. Analysis of conditions for optimal production of AFC-BC11 indicated stringent environmental regulation of its synthesis. Furthermore, the authors show that production of AFC-BC11 is largely responsible for the ability of B. cepacia BC11 to effectively control the damping-Off of cotton caused by the fungal pathogen Rhizoctonia solani in a gnotobiotic system. Using Tn5 mutagenesis, they identified, cloned, and characterized a region of the genome of strain BC11 that is required for production of this antifungal metabolite. DNA sequence analysis suggested that this region encodes proteins directly involved in the production of a nonribosomally synthesized lipopeptide.

  1. Fractally Generated Microstrip Bandpass Filter Designs Basedon Dual-Mode Square Ring Resonator for WirelessCommunication Systems

    Directory of Open Access Journals (Sweden)

    Jawad K. Ali

    2008-01-01

    Full Text Available A novel fractal design scheme has been introduced in this paper to generate microstrip bandpass filter designs with miniaturized sizes for wireless applications. The presented fractal scheme is based on Minkowski-like prefractal geometry. The space-filling property and self-similarity of this fractal geometry has found to produce reduced size symmetrical structures corresponding to the successive iteration levels. The resulting filter designs are with sizes suitable for use in modern wireless communication systems. The performance of each of the generated bandpass filter structures up to the 2nd iteration has been analyzed using a method of moments (MoM based software IE3D, which is widely adopted in microwave research and industry. Results show that these filters possess good transmission and return loss characteristics, besides the miniaturized sizes meeting the design specifications of most of wireless communication systems

  2. Creation of geodetic basis for alignment of the ring accelerator by means of the space navigation system

    International Nuclear Information System (INIS)

    The aim of the paper is to describe the creation of the geodetic basis for alignment of the UNC quadrupolar magnets with using the space navigation system GPS and old geodetic underground network. For measurements 12 points of the new ground network were laid too. The field measurements were fulfilled by means of the satellite receivers with using four satellites. The obtained results testify to satisfactory quality of measurements and good stability of centers of initial points laid more 10 years ago

  3. The new dc power supply system for the main ring magnets of the 28 GeV CERN proton synchrotron

    CERN Document Server

    Jahn, K; Steckmann, E

    1972-01-01

    High overload capacity, low residual ripple, exact reproducibility of periodic current pulses and very great reliability in long-term duty are essential requirements for a modern power supply system for feeding beam-guide magnets. These requirements can be met with certainty and at reasonable cost by the use of high-performance single-anode mercury-arc converters with suitable electronic control and protective equipment. (4 refs).

  4. Electronic Properties of Semiconductor Quantum-Ring Structures

    Science.gov (United States)

    Pacheco, Mónica; Fuster, Gonzalo; Barticevic, Zdenka

    2002-03-01

    Motivated by the interesting electronic properties exhibited by these nanorings when they are threaded by a magnetic field, we studied a new semiconductor structure formed by two coupled rings which are concentrically disposed. In order to calculate the two-ring electronic spectrum it is assumed that the in-plane electronic-potential of each ring is generated by a rotation, around the ring axis, of a one-dimensional parabolic potential centered to a distance ρ=ρo of the ring center. The potential of the two-rings system is then assumed as a superposition of a potential for each ring with their minimum at different radii and being truncated in the intersection point. In this way a potential barrier is formed in between the rings. We solve the in-plane problem by expanding the corresponding envelope function as a linear combination of solutions of isolated rings. We have made a detailed study about the influence of the characteristic confinement-parameters of each rings, and of the barrier strength, on the electronic energy spectrum of the system. A uniform magnetic field is applied along the common ring axis and we explore the effects on the Aharonov-Bohm-type oscillations in the energy levels caused by the particular geometry of two coupled quantum-rings.

  5. Dipolar bosons on an optical lattice ring

    Energy Technology Data Exchange (ETDEWEB)

    Maik, Michal [Instytut Fizyki imienia Mariana Smoluchowskiego, Uniwersytet Jagiellonski, ulica Reymonta 4, PL-30-059 Krakow (Poland); Buonsante, Pierfrancesco [Dipartimento di Fisica, Universita degli Studi di Parma, Viale G.P. Usberti n.7/A, IT-43100 Parma (Italy); Vezzani, Alessandro [Centro S3, CNR Istituto di Nanoscienze, via Campi 213/a, IT-41100 Modena (Italy); Dipartimento di Fisica, Universita degli Studi di Parma, Viale G.P. Usberti n.7/A, 43100 Parma (Italy); Zakrzewski, Jakub [Instytut Fizyki imienia Mariana Smoluchowskiego, Uniwersytet Jagiellonski, ulica Reymonta 4, PL-30-059 Krakow (Poland); Mark Kac Complex Systems Research Center, Uniwersytet Jagiellonski, ulica Reymonta 4, PL-30-059 Krakow (Poland)

    2011-11-15

    We consider an ultrasmall system of polarized bosons on an optical lattice with a ring topology, interacting via long-range dipole-dipole interactions. Dipoles polarized perpendicular to the plane of the ring reveal sharp transitions between different density-wave phases. As the strength of the dipolar interactions is varied, the behavior of the transitions is first-order-like. For dipoles polarized in the plane of the ring, the transitions between possible phases show pronounced sensitivity to the lattice depth. The abundance of possible configurations may be useful for quantum-information applications.

  6. Geodetic concept for the storage ring EUTERPE

    International Nuclear Information System (INIS)

    At present a 400 MeV electron storage ring EUTERPE is being developed at the Eindhoven Univ. of Tech. (EUT). It is a University project, set up for studies of beam dynamics, applications of synchrotron radiation and for the education of students in this field. The circumference of the ring is approx. 40 m with 12 dipoles and 32 quadrupoles. The critical wavelength of the emitted photon spectrum is 8.3 nm for the regular dipoles. The major ring components are being constructed at the University Central Design and Engineering Facilities. The concept of the geodetical system and the instrumentation are briefly described

  7. Dipolar bosons on an optical lattice ring

    Science.gov (United States)

    Maik, Michał; Buonsante, Pierfrancesco; Vezzani, Alessandro; Zakrzewski, Jakub

    2011-11-01

    We consider an ultrasmall system of polarized bosons on an optical lattice with a ring topology, interacting via long-range dipole-dipole interactions. Dipoles polarized perpendicular to the plane of the ring reveal sharp transitions between different density-wave phases. As the strength of the dipolar interactions is varied, the behavior of the transitions is first-order-like. For dipoles polarized in the plane of the ring, the transitions between possible phases show pronounced sensitivity to the lattice depth. The abundance of possible configurations may be useful for quantum-information applications.

  8. Ringed Seal Distribution Map

    Data.gov (United States)

    National Oceanic and Atmospheric Administration, Department of Commerce — This dataset contains GIS layers that depict the known spatial distributions (i.e., ranges) of the five subspecies of ringed seals (Phoca hispida). It was produced...

  9. Remotely operated locking ring

    International Nuclear Information System (INIS)

    A ring for fastening tubes with conical ends with only one manipulator is described. It is opened by compression of a spring with the manipulator grip, placed on the tubes to fasten, closed by releasing the pressure and locked

  10. Storage Ring EDM Experiments

    Science.gov (United States)

    Semertzidis, Yannis K.

    2016-04-01

    Dedicated storage ring electric dipole moment (EDM) methods show great promise advancing the sensitivity level by a couple orders of magnitude over currently planned hadronic EDM experiments. We describe the present status and recent updates of the field.

  11. The g-2 ring

    CERN Multimedia

    1974-01-01

    The precise measurement of "g-2", the anomalous magnetic moment of the muon, required a special muon storage ring with electrostatic focussing and very accurate knowledge of the magnetic bending field. For more details see under photo 7405430.

  12. Child sex rings.

    OpenAIRE

    Wild, N J; Wynne, J M

    1986-01-01

    Details of 11 child sex rings identified in one working class community were obtained by interviewing investigating police officers and examining health and social services records. The rings contained 14 adult male perpetrators and 175 children aged 6-15 years. Most perpetrators used child ringleaders to recruit victims; others became a "family friend" or obtained a position of authority over children. Secrecy was encouraged and bribery, threats, and peer pressure used to induce participatio...

  13. Is the bell ringing?

    CERN Multimedia

    Francesco Poppi

    2010-01-01

    During the Nobel prize-winning UA1 experiment, scientists in the control room used to ring a bell if a particularly interesting event had occurred. Today, the “CMS Exotica hotline” routine produces a daily report that lists the exotic events that were recorded the day before.   Display of an event selected by the Exotica routine. Take just a very small fraction of the available data (max. 5%); define the events that you want to keep and set the parameters accordingly; run the Exotica routine and only look at the very few images that the system has selected for you. This is the recipe that a small team of CMS researchers has developed to identify the signals coming from possible new physics processes. “This approach does not replace the accurate data analysis on the whole set of data. However, it is a very fast and effective way to focus on just a few events that are potentially very interesting”, explains Maurizio Pierini (CERN), who developed the...

  14. First-principles prediction of MgB2-like NaBC: A more promising high-temperature superconducting material than LiBC

    Science.gov (United States)

    Miao, Rende; Huang, Guiqin; Yang, Jun

    2016-05-01

    Crystal structure, lattice dynamics, and superconducting properties for sodium borocarbides NaB1+xC1-x are investigated with first-principles calculations. Based on crystal structure analysis by particle swarm optimization methodology, NaBC is predicted to crystallize in the layered P63 / mmc crystal structure as LiBC. However, it is different from LiBC, in that Na atoms are effectively ionized, with no longitudinal covalence exist between Na and B-C layers, just as in the case of MgB2. Therefore, Na1-xBC is more similar to MgB2 than Li1-xBC as a potential high-temperature superconductor. Further more, we suggest that the slight hole doping of NaBC through partial substitution of C by B atoms can also produce cause superconductivity. The phonon spectra for NaBC and NaB1.1C0.9 are obtained within the virtual-crystal approximation treatment. There is a remarkable softening of the in-plane B-C bond-stretching modes for NaB1.1C0.9 in certain regions of the Brillouin zone, while other phonon bands show no obvious softening behavior. This conspicuous softening of the in-plane B-C bond-stretching modes indicates a strong electron-phonon coupling for them. The obtained total electron-phonon coupling strength λ for NaB1.1C0.9 is 0.73, and superconducting transition temperature TC is predicted to be 35 K (μ* = 0.1). This indicates that NaB1+xC1-x is potentially high-temperature superconducting and hole doping of NaBC could produce high-temperature superconductivity. In addition, we conjecture that, to design a MgB2-like high TC superconducting material, the longitudinal covalent bonds between the metal cations and graphite-like layers need be excluded.

  15. Recent studies on the PRISM FFAG ring

    International Nuclear Information System (INIS)

    Next generation lepton flavour violation experiments require high intensity and high quality muon beams. The PRISM Task Force focuses on accelerator R and D for realizing such beams using an FFAG ring. The scaling and non-scaling designs for the PRISM FFAG ring are discussed. The recent studies on injection/extraction systems and matching to the solenoid channel are outlined. The future plans for the study are presented.

  16. A transformable tensegrity-ring footbridge

    OpenAIRE

    Rhode-Barbarigos, Landolf; Motro, René; Smith, Ian F.C.

    2012-01-01

    International audience Tensegrity structures are spatial reticulated structures composed of cables and struts. A tension-compression equilibrium leads to lightweight systems that change shape through length changes in their members. Active members thus control several degrees of freedom simultaneously. Tensegrity-ring modules are transformable circuit-pattern modules. The linear combination of tensegrity rings has been shown to be viable for a footbridge application. Shape transformations ...

  17. A COLLISIONAL ORIGIN FOR THE LEO RING

    International Nuclear Information System (INIS)

    Extended H I structures around galaxies are of prime importance for probing galaxy formation scenarios. The giant H I ring in the Leo group is one of the largest and most intriguing H I structures in the nearby universe. Whether it consists of primordial gas, as suggested by the apparent absence of any optical counterpart and the absence of an obvious physical connection to nearby galaxies, or of gas expelled from a galaxy in a collision is actively debated. We present deep wide field-of-view optical images of the ring region obtained with MegaCam on the CFHT. They reveal optical counterparts to several H I and UV condensations along the ring, in the g', r', and i' bands, which likely correspond to stellar associations formed within the gaseous ring. Analyzing the spectral energy distribution of one of these star-forming regions, we found it to be typical for a star-forming region in pre-enriched tidal debris. We then use simulations to test the hypothesis that the Leo ring results from a head-on collision between Leo group members NGC 3384 and M96. According to our model which is able to explain, at least qualitatively, the main observational properties of the system, the Leo ring is consistent with being a collisional ring. It is thus likely another example of extended intergalactic gas made-up of pre-enriched collisional debris.

  18. Laser system for cooling of relativistic C{sup 3+}-ion beams in storage rings; Lasersystem zur Kuehlung relativistischer C{sup 3+}-Ionenstrahlen in Speicherringen

    Energy Technology Data Exchange (ETDEWEB)

    Beck, Tobias

    2015-02-15

    Cold ion beams are essential for many precision experiments at storage rings. While spectroscopic experiments gain from the high energy resolution, collision experiments benefit from the increased luminosity. Furthermore, sympathetic cooling of exotic species is conceivable with the aid of cold ion beams. Besides the long established electron cooling, alternative cooling methods are gaining in importance, especially for high energy particles. In the past, experiments to cool ions with lasers were performed. Because of the matching wavelength and output power, frequency doubled Argon-ion lasers at 257 nm were used during these experiments. Due to the strongly limited scanning potential of these systems, it was not possible to cool the full inertia spread of the ion beams. A new laser system was developed in this thesis because of the lack of commercial alternatives. After the characterization of the system, it was tested during a beamtime at the Experimentierspeicherring (ESR) at the Gesellschaft fuer Schwerionenforschung (GSI). The completely solid state based system delivers up to 180 mW of output power at 257 nm and is modehop free tunable up to 16 GHz in 10 ms at this wavelength. By using efficient diode lasers, the new system consumes considerably less power than comparable Argon-ion lasers. The fundamental wavelength of 1028 nm is amplified up to 16 W with an Yb-doped fiber amplifier. Subsequently, the target wavelength of 257 nm is realized in two consecutive build-up cavities. Another diode laser, stabilized to a wavelength meter, serves as a frequency reference. This new laser system first came to operation during beamtime in August 2012, when relativistic C{sup 3+} ions with β=0.47 were cooled successfully. For the first time it was possible to access the whole inertia spread of a bunched ion beam without electron precooling. In contrast to prior experiments, only the laser frequency was scanned and not the bunching frequency of the ion beam. The results

  19. Systemic lupus erythematosus with craniocerebral ring-enhancing lesion%系统性红斑狼疮伴颅内环形强化病灶

    Institute of Scientific and Technical Information of China (English)

    全军肾脏病研究所学术委员会

    2012-01-01

    报道1例重症系统性红斑狼疮患者,病程中发生严重的血小板减少伴支气管出血,急性胰腺炎,同时头颅MRI检查发现颅内环形强化病灶,肾活检病理诊断为狼疮性肾炎Ⅳ型伴血栓性微血管病.经积极治疗,狼疮活动性病变控制,各器官功能改善,但颅内病灶增大,经脑活检确诊为颅内曲霉菌感染,予手术切除病灶及抗曲霉菌治疗,预后良好.%We reported a patient of severe systemic lupus erythematosus, had thrombocytopenia with bronchohemorrhage, lupus nephritis with thrombotic microangiopathies, acute pancreatitis, and craniocerebral ring-enhancing lesion found by MRI. The activity of lupus and the function of organs was improved with therapy, while the craniocerebral lesion was aggravated, then brain biopsy was performed to diagnose craniocerebral aspergillosis, surgical excision followed by antifungal therapy were given and the patient had a good outcome.

  20. The Vulnerability of Saskatchewan Water Resource System to Multi-Year Hydrologic Droughts at North and South Saskatchewan Rivers: Fusing Paleo Tree Ring Data with Stochastic Reconstruction

    Science.gov (United States)

    Nazemi, A.; Brunet, N.; Oegema, B.

    2015-12-01

    Despite having a semi-arid cold region, the province of Saskatchewan in western Canada is home to major agricultural activities. This is due to a reliable water supply in North and South Saskatchewan rivers (hereafter NSR and SSR), initiated from the Rocky Mountain headwaters in south western Alberta. The incoming interprovincial streamflow to Saskatchewan, however, is subject to significant annual variations due to natural climate variability, climate change as well as human use and regulation. Most importantly, severe multi-year hydrologic droughts in NSR and SSR have been observed within historical and paleo records. Such long-term low flow conditions can cause vulnerability in the water supply systems, particularly if combined with an increased irrigation demand, due to global warming, crop change, meteorological drought and/or irrigation expansion. This study aims at providing a novel use of long-term annual paleo streamflow records for monthly, multi-sector drought impact assessment. By considering tree ring-based reconstructed annual streamflow records, 10-year drought sequences with 100-year return periods were obtained at NSR and SSR. The annual sequences were converted to monthly flow hydrographs using a stochastic reconstruction scheme. The water resource system was then conditioned to multiple realizations of the monthly drought sequence and simulated under various scenarios for reservoir operation and increment in irrigation demand. Simulation results show that Saskatchewan can still maintain the Saskatchewan/Manitoba apportionment requirement, even under a 10-year drought and 10 folds increment in irrigation demand. Such severe drought sequence, nonetheless, cause significant decline in Saskatchewan's hydropower production, which is currently the most profitable water sector in the province. Changes in reservoir operation, however, can considerably mitigate the adverse effects of drought and increased irrigation demand on hydropower industry